Production line suitable for urea pump assembly

Abstract

The invention relates to a production line suitable for urea pump assembly, which comprises a manual assembly line, an automatic assembly line and a detection line, the manual assembly line, the automatic assembly line and the detection line are sequentially connected, the manual assembly line is used for conveying a urea pump assembly body after preliminary assembly to the automatic assembly line for assembly, and the automatic assembly line is used for conveying the urea pump assembly body after preliminary assembly to the detection line. The automatic assembly line is used for installing core parts on urea pump assemblies and conveying the urea pump assemblies provided with the core parts to the detection line, and the detection line is used for assembling the urea pump assemblies into a complete urea pump and detecting the performance of the urea pump. According to the production line, the productivity and the product consistency are remarkably improved, the automatic assembly line can operate continuously, and the yield is improved by multiple times; accurate assembly and online detection enable the yield to be greatly improved and the rework rate to be remarkably reduced, so that errors and cost caused by manual operation differences are reduced, and the overall production efficiency and the quality management level are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of urea pump production, and specifically, it is a production line applicable to the assembly of urea pumps. Background Art

[0002] The urea pump is the core component of the diesel engine SCR (Selective Catalytic Reduction) system, which directly affects whether the exhaust emissions of diesel vehicles comply with regulations. Its assembly quality directly affects the conversion efficiency of nitrogen oxides (NOx) and the system reliability. The application of urea pump technology is of great value for reducing diesel vehicle emission pollution and protecting the environment. The construction and optimization of its automated production line are important practical links in promoting the green and intelligent transformation and upgrading of the manufacturing industry.

[0003] The urea pump is large in volume and complex in structure, with high requirements for sealing performance, protection level, etc. The traditional production line for diesel vehicle urea pumps mainly relies on manual assembly and semi-automated processes, highly depends on the operation of skilled workers, has high labor intensity and low efficiency. The manual manufacturing method leads to poor process consistency, large quality fluctuations between production batches, and high scrap rates and additional costs are easily generated due to the lack of strict and standardized quality control. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to have a high degree of automation, greatly reduce manpower and material resources, and ensure the consistency and stability of products. In view of the above deficiencies, a production line applicable to the assembly of urea pumps is provided.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A production line applicable to the assembly of urea pumps includes a manual assembly line, an automatic assembly line, and an inspection line. The manual assembly line, the automatic assembly line, and the inspection line are connected in sequence. The manual assembly line is used to convey the preliminarily assembled urea pump assembly to the automatic assembly line for assembly. The automatic assembly line is used to install the core parts on the urea pump assembly and convey the urea pump assembly with the core parts installed to the inspection line. The inspection line is used to assemble the urea pump assembly into a complete urea pump and detect the performance of the urea pump.

[0007] The automatic assembly line includes a gantry truss and a pressure sensor, a PP pump installation station, an SP pump installation station, a pipe joint and fixing piece installation station, and a filter element rubber rod and filter element cover installation station sequentially arranged along the gantry truss.

[0008] The detection line includes a double-speed chain conveyor line, a lifting and positioning mechanism, a first elevator, a first airtightness detection station, a first defective product rejection mechanism, a wire harness sorting station, an upper cover locking station, a lower cover locking station, a second airtightness detection station, a second defective product rejection mechanism, a waterproof and breathable cap assembly station, and a second elevator sequentially arranged along the double-speed chain conveyor line from front to back. A comprehensive performance detection station is arranged on one side of the tail end of the double-speed chain conveyor line.

[0009] The manual assembly line is used to convey the preliminarily assembled urea pump assembly to the pressure sensor and PP pump installation stations. The pressure sensor and PP pump installation stations are used to clamp the urea pump assembly and install the pressure sensor and PP pump on the urea pump assembly. The SP pump installation station is used to clamp the urea pump assembly with the pressure sensor and PP pump installed at the pressure sensor and PP pump installation stations and install the SP pump on the urea pump assembly. The pipe joint and fixing piece installation station is used to clamp the urea pump assembly with the SP pump installed at the SP pump installation station and install the pipe joint and fixing piece on the urea pump assembly. The filter element rubber rod and filter element cover installation station is used to clamp the urea pump assembly with the pipe joint and fixing piece installed at the pipe joint and fixing piece installation station and install the filter element rubber rod and filter element cover on the urea pump assembly. The filter element rubber rod and filter element cover installation station is also used to clamp and move the urea pump assembly with the filter element rubber rod and filter element cover installed to the lifting and positioning mechanism.

[0010] The lifting and positioning mechanism is used to position and fix the tooling board after detecting the tooling board. The tooling board is used to fixedly place the filter element rubber rod and the urea pump assembly transported from the filter element cover installation station. The lifting and positioning mechanism is used to lift and transport the tooling board with the urea pump assembly installed to the lifting mechanism after detecting that the urea pump assembly is placed well. The first elevator is used to transport the tooling board with the urea pump assembly installed to the upper conveyor line of the double-speed chain conveyor line after detecting the tooling board. The double-speed chain conveyor line is used to transport the tooling board with the urea pump assembly installed to the airtightness detection station through the upper conveyor line. The first airtightness detection station is used to detect the airtightness inside the urea pump assembly after detecting the urea pump assembly, and send an allow-through signal to the first defective product rejection mechanism when the detection is qualified, and send a non-allow-through signal to the first defective product rejection mechanism when the detection is unqualified. The first defective product rejection mechanism is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet after receiving the non-allow-through signal. The upper conveyor line is used to sequentially transport the qualified urea pump assembly with qualified airtightness to the wire harness arrangement station, the upper cover locking station and the lower cover locking station. The upper cover locking station is used to install and lock the upper cover on the urea pump assembly. The lower cover locking station is used to install and lock the lower cover on the urea pump assembly. The upper conveyor line is used to transport the urea pump assembly with the lower cover installed to the second airtightness detection station. The second airtightness detection station is used to detect the airtightness between the urea pump assembly and the upper cover and the lower cover after detecting the urea pump assembly with the lower cover installed, and send an allow-through signal to the second defective product rejection mechanism when the detection is qualified, and send a non-allow-through signal to the second defective product rejection mechanism when the detection is unqualified. The second defective product rejection mechanism is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet and alarm for waiting for processing after receiving the non-allow-through signal. The upper conveyor line is used to transport the qualified urea pump assembly with qualified airtightness to the waterproof breather cap assembly station. The waterproof breather cap assembly station is used to install the waterproof breather cap on the urea pump assembly to form a complete urea pump after detecting the urea pump assembly with qualified airtightness. The comprehensive performance test station is used to remove the complete urea pump from the tooling board and place it on the comprehensive performance detection equipment to detect the working performance of the complete urea pump and store the defective products and qualified products separately. The empty tooling board continues to be transported forward to the second elevator. The second elevator is used to lower and transport the empty mounting board to the lower conveyor line. The lower conveyor line is used to transport the tooling board in the reverse direction to the front end of the lower conveyor line. The first elevator is used to lower and lift the tooling board on the lower conveyor line and transport it to the lifting and positioning mechanism to wait for placing the urea pump assembly when the lifting and positioning mechanism does not detect the tooling board.

[0011] After the defective urea pump assemblies at the first defective product rejection mechanism and the second defective product rejection mechanism are processed, the first defective product rejection mechanism and the second defective product rejection mechanism are used to push the empty tooling plates back to the upper conveyor line for circulation.

[0012] A tooling plate sensor for detecting the presence of a tooling plate is provided on the lifting and positioning mechanism. Urea pump sensors are provided at preset heights on the upper sides of the lifting and positioning mechanism, the first elevator, the first airtightness detection station, the first defective product rejection mechanism, the wire harness sorting station, the upper cover locking station, the lower cover locking station, the second airtightness detection station, the second defective product rejection mechanism, the waterproof breathable cap assembly station, and the second elevator. When a urea pump is installed on the tooling plate, the urea pump sensor can detect it and send a signal to the corresponding station, and the corresponding station performs corresponding actions. When an empty tooling plate passes by, the urea pump sensor cannot detect it, and the corresponding station does not perform corresponding actions and directly allows the empty tooling plate to pass through. The upper conveyor line directly transports the empty tooling plate to the second elevator for circulation.

[0013] Furthermore, the tooling plate includes inserts, buffer rubber blocks, bottom induction iron blocks, side induction iron blocks, and magnetic iron blocks. A plurality of inserts are provided inside the positioning holes on the tooling plate, and the plurality of inserts are used to cooperate with the lifting and positioning mechanism to fix the tooling plate and reduce wear of the tooling plate. Buffer rubber blocks are provided on both the front and rear sides of the tooling plate, and the buffer rubber blocks are used to reduce the impact noise between adjacent two tooling plates. Bottom induction iron blocks and side induction iron blocks are respectively provided on the bottom surface and the side surface of the tooling plate, and the bottom induction iron blocks and the side induction iron blocks are both used to cooperate with the tooling plate sensor to sense the tooling plate. A magnetic iron block is provided on one of the left and right sides of the tooling plate, and the magnetic iron block is used to cooperate with the first defective product rejection mechanism and the second defective product rejection mechanism to transfer defective products. Positive fixing positions and reverse fixing positions for respectively placing the urea pump assemblies in the forward and reverse directions are provided on the tooling plate, and both the positive fixing positions and the reverse fixing positions are composed of a plurality of positioning posts with different heights arranged according to the structure of the urea pump equipment body.

[0014] Further, the pressure sensor and PP pump installation station includes a first manipulator, a second manipulator, a pump body feeding mechanism, a pressure sensor feeding mechanism, a PP pump feeding mechanism, and a first locking machine. The first manipulator is provided with a pressure sensor clamping claw and a pump body clamping claw. The first manipulator is used to first clamp the pressure sensor conveyed by the pressure sensor feeding mechanism with the pressure sensor clamping claw and then lift and rotate to replace it with the pump body clamping claw. The first manipulator is used to clamp the urea pump assembly conveyed by the pump body feeding mechanism with the pump body clamping claw and place it on the first locking machine after the pump body feeding mechanism detects that the conveyed urea pump assembly reaches the clamping designated position. The second manipulator is provided with a PP pump clamping claw and a pump body clamping claw. The second manipulator is used to first clamp the PP pump conveyed by the PP pump feeding mechanism with the PP pump clamping claw before the first manipulator places the urea pump assembly. The first locking machine is used to fix the urea pump assembly after detecting the urea pump assembly. The first manipulator is used to first lift and rotate to replace it with the pressure sensor clamping claw and then place the pressure sensor on the urea pump assembly with the pressure sensor clamping claw after the urea pump assembly is fixed. The second manipulator is used to place the PP pump on the urea pump assembly on which the pressure sensor is placed after the first locking machine detects the installation of the pressure sensor. The first locking machine is used to lock the pressure sensor and the PP pump to the urea pump assembly with bolts after detecting that both the pressure sensor and the PP pump are placed on the urea pump assembly.

[0015] The SP pump installation station includes a third manipulator, an SP pump feeding mechanism, and a second locking machine. The third manipulator is provided with an SP pump clamping claw and a pump body clamping claw. The second manipulator is also used to clamp the urea pump assembly with the pressure sensor and the PP pump installed on the pressure sensor and PP pump installation station with the pump body clamping claw and place it on the second locking machine. The third manipulator is used to clamp the SP pump conveyed by the SP feeding mechanism with the SP pump clamping claw before the second manipulator clamps and places the urea pump assembly. The second locking machine is used to fix the urea pump assembly after detecting the urea pump assembly. The third manipulator is used to place the SP pump on the urea pump assembly after the urea pump assembly is fixed and then lift and rotate the clamping end to transform it into the pump body clamping claw. The second locking machine is also used to lock the SP pump to the urea pump assembly with bolts after detecting the placement of the SP pump.

[0016] Further, the pipe joint and fixing piece installation station includes a fourth manipulator, a pipe joint feeding mechanism, a fixing piece feeding mechanism, a third locking machine, and a first pump body turning mechanism.

[0017] On one side of the output end of the fixed piece feeding mechanism, there is a first pump body flipping mechanism. On one side of the first pump body flipping mechanism, there is a third locking machine. The fourth manipulator is located above the first pump body flipping mechanism. The fourth manipulator realizes horizontal movement through a guide rail. The fourth manipulator includes a pipe joint clamping claw and a fixed piece clamping claw.

[0018] The fixed piece feeding mechanism includes a lead screw slide rail, a storage plate, a push block and a support plate. On both the left and right sides of the lead screw slide rail, there are support plates parallel to the lead screw slide rail. On the relative sides of the upper surfaces of the two support plates, there are horizontal chutes for supporting the two ends of the fixed piece. The two ends of the support plate are respectively the feeding end and the discharging end. Above the feeding end, there is a storage plate horizontally arranged. In the middle of the storage plate, there is a blanking through hole. On the front and rear sides of the blanking through hole, there are respectively a fixed piece limiting plate and a fixed piece limiting column. Between the fixed piece limiting plate and the fixed piece limiting column, fixed pieces are stacked and placed. The lowermost one of a stack of fixed pieces is located at the feeding end. Multiple fixed pieces are stacked and placed on the chute inside the through hole. The lead screw slide rail is used to push the fixed piece at the feeding end forward along the chute to the discharging end through the push block.

[0019] The third manipulator is also used to use the pump body clamping claw to clamp and place the urea pump assembly with the SP pump installed at the SP pump installation station on the first pump body flipping mechanism at the pipe joint and fixed piece installation station. The fourth manipulator is used to, before the third manipulator places the urea pump assembly, use the pipe joint clamping claw to simultaneously clamp a group of three pipe joints on the pipe joint feeding mechanism and lift it to rotate the clamping end to the fixed piece clamping claw. The fourth manipulator is also used to, after clamping the pipe joint, use the fixed piece clamping claw to clamp the fixed piece conveyed by the fixed piece feeding mechanism and lift it to rotate the clamping end to the pipe joint clamping claw. The first pump body flipping mechanism is used to clamp and fix the urea pump assembly; the first pump body flipping mechanism is also used to drive the urea pump assembly to flip from the horizontal state to the vertical state after clamping and fixing the urea pump assembly. The fourth manipulator is used to install the three pipe joints at the corresponding positions on the urea pump assembly simultaneously after detecting that the urea pump assembly has completed flipping. The fourth manipulator is also used to lift and rotate the clamping end to the fixed piece clamping claw after installing the pipe joint and install the fixed piece on the outside of the pipe joint of the urea pump assembly. After the sensor at the discharging end of the fixed piece feeding mechanism detects that the fixed piece has been clamped, the first lead screw guide rail drives the push block to reset and pushes the next fixed piece to move to the discharging end again, repeating the process of clamping and installing the fixed piece. The third locking machine is used to lock the fixed piece and the urea pump assembly through bolts to uniformly fix the three pipe joints. After the third locking machine locks the fixed piece, the first pump body flipping mechanism flips the urea pump assembly from the vertical state to the horizontal state and releases the fixation on the urea pump assembly.

[0020] Further, the installation station for the filter element rubber rod and the filter element cover includes a fifth robot, a sixth robot, a filter element rubber rod feeding mechanism, a filter element cover feeding mechanism, a cap screwing device, and a second pump body turning mechanism. The fifth robot is provided with a pump body clamping claw and a filter element rubber rod clamping claw, and the sixth robot is only provided with a pump body clamping claw.

[0021] The filter element cover feeding mechanism includes a frame, a plurality of material racks, a pushing cylinder, a belt conveyor, an intercepting cylinder, a clamping and positioning cylinder, a cover plate, and a limiting rod.

[0022] The cap screwing device includes a cap screwing motor, a pressing and resetting cylinder, a cap screwing fixture, a cylinder support frame, a connecting plate, a precision reducer, a stabilizing plate, and a first buffer.

[0023] The fifth manipulator is used to first clamp and pick up the filter element rubber rod conveyed by the filter element rubber rod feeding mechanism with the filter element rubber rod clamping claw and lift it, and then rotate the clamping end to replace it with the pump body clamping claw. The fifth manipulator is also used to clamp and pick up the urea pump assembly with the pipe joint and the fixing piece installed at the pipe joint and fixing piece installation station with the pump body clamping claw, place it on the second pump body flipping mechanism, and lift it to rotate the clamping end to replace it with the filter element rubber rod clamping claw. The second pump body flipping mechanism is used to fix and lock the urea pump assembly after detecting the urea pump assembly and flip the urea pump assembly from a horizontal state to a vertical state. The fifth manipulator is used to place the filter element rubber rod on the urea pump assembly after detecting that the urea pump assembly is flipped to a vertical state. The pushing cylinder is used to push the filter element cover to the through hole and drop it onto the belt conveyor after the sensor detects the filter element cover. Sensors for detecting whether there is a filter element cover at the feeding end of the intercepting cylinder and for detecting whether the filter element cover passes through the discharging end of the intercepting cylinder are respectively arranged at the feeding end and the discharging end of the intercepting cylinder. The intercepting cylinder is used to extend to intercept the subsequent filter element covers after both sensors detect the filter element cover, allowing only one filter element cover to pass through each time. A sensor for detecting whether the filter element cover reaches the clamping position is arranged at the clamping and positioning cylinder. The clamping and positioning cylinder is used to extend to clamp and position the filter element cover to the clamping position after the sensor detects the filter element cover. The electric slide rail is used to drive the cap screwing device to move to the filter element cover clamping position after the clamping and positioning cylinder clamps the filter element cover. The pressing and resetting cylinder is used to extend downward to push the connecting plate to move a specified distance after moving to the filter element cover clamping position. The connecting plate is used to drive the cap screwing fixture to move a specified distance and press it into the filter element cover. The pressing and resetting cylinder is used to contract upward to pull the connecting plate to reset and drive the cap screwing fixture to clamp the filter element cover after the cap screwing fixture presses into the filter element cover. The electric slide rail is used to drive the cap screwing device to move to the specified filter element cover installation position after the connecting plate resets. The pressing and resetting cylinder is used to extend downward to drive the cap screwing fixture to move downward to the specified position after reaching the specified filter element cover installation position. The cap screwing motor is used to drive the cap screwing fixture to rotate to screw the filter element cover into the urea pump assembly while the cap screwing fixture moves downward. The pressing and resetting cylinder is used to contract upward to drive the cap screwing fixture to move out of the filter element cover and reset after the filter element cover is screwed into the urea pump assembly. The second pump body flipping mechanism is used to flip the urea pump assembly back to the horizontal state and release the fixation of the urea pump assembly after detecting that the filter element cover is screwed into the urea pump assembly. The sixth manipulator is used to clamp and pick up the urea pump assembly with the filter element rubber rod and the filter element cover installed and place it on the lifting and positioning mechanism.

[0024] Further, lifting and clamping cylinders for clamping and positioning the tooling plates are provided on the manual assembly line, the double-layer double-speed chain conveyor line, and the lifting and positioning mechanism. There is one lifting and clamping cylinder at each station on the double-layer double-speed chain conveyor line. When the urea pump sensor at the corresponding station detects that a urea pump assembly is installed on the tooling plate, the lifting and clamping cylinder at the corresponding station will quickly rise to clamp and fix the tooling plate. When the urea pump sensor does not detect that a urea pump assembly is installed on the tooling plate, the lifting and clamping cylinder will not rise.

[0025] Further, the lifting and positioning mechanism includes a first profile frame, a roller conveyor line, a roller motor, and a positioning pin. The roller conveyor line is horizontally arranged on the first profile frame. The roller motor and the positioning pin are respectively arranged below the roller conveyor line. The roller motor is used to drive the roller conveyor line to rotate in the same direction as the first elevator to convey the tooling plate onto the roller conveyor line after the tooling plate sensor does not detect the tooling plate. The positioning pin is used to lift and position the tooling plate by passing through between multiple inserts after the tooling plate sensor detects the tooling plate. The positioning pin is used to lower and release the positioning after the urea pump sensor detects that the urea pump assembly is placed on the tooling plate. The roller motor is used to drive the roller conveyor line to convey the tooling plate onto the first elevator after the positioning pin descends.

[0026] The first elevator includes a second profile frame, a belt conveyor mechanism, a driving motor, and a lifting cylinder. The lifting cylinder is used to drive the belt conveyor mechanism to descend to be flush with the lower conveyor line when the tooling plate sensor of the lifting and positioning mechanism does not detect the tooling plate. The driving motor is used to drive the belt conveyor mechanism to rotate in the same direction as the lower conveyor line to move the tooling plate onto the belt conveyor mechanism. The lifting cylinder is used to drive the belt conveyor mechanism to rise and reset. The driving motor is used to drive the belt conveyor mechanism to convey the tooling plate to the lifting and positioning mechanism after the belt conveyor mechanism resets. The driving motor is used to drive the belt conveyor mechanism to convey the tooling plate to the upper conveyor line in the same direction as the upper conveyor line after the urea pump assembly is placed on the tooling plate on the lifting and positioning mechanism. The second elevator has the same structure and operating principle as the first elevator.

[0027] Further, both the first airtightness detection station and the second airtightness detection station include an airtightness detection equipment body and an airtightness detection table. The airtightness detection table includes a pressing and fixing cylinder, a sealing component, a pushing cylinder, and a mounting rack. An mounting rack is arranged on the airtightness detection table, and a pushing cylinder is mounted on the mounting rack. A sealing component is arranged at the telescopic end of the pushing cylinder. Two pressing and fixing cylinders are arranged on the mounting rack on the left and right sides of the sealing component. The sealing component of the first airtightness detection station is three sealing joints corresponding to three pipe joints, and the sealing component of the second airtightness detection station is a single sealing joint corresponding to the waterproof breathable hole. An airtightness detection table is arranged on the airtightness detection body. When the tooling plate with the urea pump assembly is transported to the airtightness detection station, the lifting and clamping cylinder rises to fix the tooling plate. The pressing and fixing cylinder is used to descend and press-fix the urea pump assembly after the tooling plate is fixed. The pushing cylinder is used to push the sealing component to dock and seal with the three pipe joints or the waterproof breathable hole on the urea pump assembly after the urea pump assembly is fixed. The airtightness detection equipment body is used to inflate the inner side of the urea pump assembly through the sealing component at the docking port of the sealing component to detect the airtightness of the urea pump assembly. During inflation, pressure is maintained for a certain period of time, and the decay of the gas pressure in the pump is read. If the decay exceeds the specified value, it is defective; otherwise, it is qualified.

[0028] Further, the first defective product rejection mechanism includes a pushing cylinder, an electromagnetic fixture, and a defective product storage cabinet. The defective product storage cabinet is located on one side of the upper conveyor line. Both the pushing cylinder and the electromagnetic fixture are located inside the defective product storage cabinet. When the urea pump sensor of the first defective product rejection mechanism detects a defective urea pump assembly, the lifting and clamping cylinder at the first defective product rejection mechanism is used to rise and clamp the tooling plate. The pushing cylinder is used to push the electromagnetic fixture towards the fixed tooling plate. The electromagnetic fixture is used to adsorb and hold the magnetic iron block on the tooling plate. The lifting and clamping cylinder is used to descend and reset to release the clamping and fixing of the tooling plate after the electromagnetic fixture adsorbs and holds the tooling plate. The pushing cylinder is used to pull the electromagnetic fixture to reset after the lifting and clamping cylinder descends and resets. The reset of the electromagnetic fixture drives the tooling plate and the defective urea pump assembly to move inside the defective product storage cabinet and alarm. The second defective product rejection mechanism has the same structure and operating principle as the first defective product rejection mechanism.

[0029] Further, the wire harness arrangement station, the upper cover locking station, the lower cover locking station, and the waterproof breathable cap assembly station are all semi-automatic stations. The upper cover locking station is provided with a fourth locking machine for installing the upper cover. The lower cover locking station is provided with a fifth locking machine and a first flipping mechanism. The first flipping mechanism is used to flip the urea pump assembly installed with the upper cover by a certain degree and place it on the reverse fixing position of the tooling plate. The fifth locking machine is used to install the lower cover on the flipped urea pump assembly. The waterproof breathable cap assembly station is provided with a second flipping mechanism and a waterproof breathable cap installation mechanism. The second flipping mechanism is used to flip the urea pump assembly installed with the lower cover by a certain degree again and place it on the forward fixing position of the tooling plate. The waterproof breathable cap installation mechanism is used to install the waterproof breathable cap on the flipped urea pump assembly. The wire harness arrangement station, the upper cover locking station, the lower cover locking station, and the waterproof breathable cap assembly station are all provided with reset buttons. After the reset buttons are triggered, they are used to lower and reset the lifting and clamping cylinders of the corresponding stations to release the tooling plate and convey it to the next station.

[0030] After the present invention adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0031] Compared with traditional manual production, the production line of the present invention significantly improves production capacity and product consistency. The automated production line can run continuously, and the output is increased several times; precise assembly and on-line detection greatly improve the qualified rate and significantly reduce the rework rate. Thereby, the errors and costs caused by manual operation differences are reduced, and the overall production efficiency and quality management level are significantly enhanced.

[0032] The production line adopts a modular and flexible structure design, and each station unit can be flexibly increased, decreased, or adjusted according to needs. In this way, the production of different models of urea pumps can be quickly switched, and multi-variety mixed-line assembly can be realized. When the process is upgraded or the production capacity is expanded, only the relevant modules need to be replaced or transformed, and it has good scalability and upgrade potential. This flexible production mode meets the rapidly changing needs of the market and has obvious practical value and innovation advantages.

[0033] Industrial robots are used to undertake high-precision screwing and handling operations, and machine vision is combined to improve the detection accuracy. During the production process, production data is collected and traced in real time to realize the visual management and process traceability of the production process. Through automatic data analysis and intelligent decision support, the production plan and material scheduling can be dynamically optimized, effectively shortening the production cycle and improving production flexibility.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0035] Figure 1 It is a three-dimensional structural schematic diagram of the overall production line of the present invention;

[0036] Figure 2 Top view of the overall assembly line for the manual assembly line

[0037] Figure 3 Schematic structural diagram of the assembly line for the pressure sensor and PP pump installation station;

[0038] Figure 4 Schematic structural diagram of the assembly line for the SP pump installation station;

[0039] Figure 5 Schematic structural diagram of the assembly line for the pipe joint and fixing piece installation station;

[0040] Figure 6 Schematic structural diagram of the assembly line for the filter element rubber rod and filter cover installation station;

[0041] Figure 7 Schematic three-dimensional structure diagram of the fixing piece feeding mechanism;

[0042] Figure 8 Schematic three-dimensional structure diagram of the filter cover feeding mechanism;

[0043] Figure 9 Schematic three-dimensional structure diagram of the cap screwing device;

[0044] Figure 10 Schematic diagram of the flipping state of the second pump body flipping mechanism;

[0045] Figure 11 Schematic three-dimensional structure diagram of the detection line;

[0046] Figure 12 Schematic three-dimensional structure diagram of the lifting and positioning mechanism;

[0047] Figure 13 Schematic three-dimensional structure diagram of the first elevator;

[0048] Figure 14 Schematic three-dimensional structure diagram of the airtightness detection bench;

[0049] Figure 15 Schematic structure diagram of the tooling plate;

[0050] Figure 16 Schematic three-dimensional structure diagram of the tray feeding mechanism.

[0051] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0052] 1. Unpowered roller conveyor line; 2. Installation station for temperature sensor and heating blanket; 3. Backside attachment station for heating blanket; 4. Installation station for runner block seal ring and runner block; 5. Frontside attachment station for heating blanket; 6. Installation station for overflow conduit, PP pump seal ring and SP pump seal ring; 7. Unpowered bull eye wheel conveying mechanism; 8. Gantry truss; 9. Installation station for pressure sensor and PP pump; 901. First manipulator; 902. Second manipulator; 903. Pump body feeding mechanism; 904. Pressure sensor feeding mechanism; 905. PP pump feeding mechanism; 906. First attachment machine; 10. Installation station for SP pump; 1001. Third manipulator; 1002. SP pump feeding mechanism; 1003. Second attachment machine; 11. Installation station for pipe joint and fixing piece; 1101. Fourth manipulator; 1102. Pipe joint feeding mechanism; 1103. Fixing piece feeding mechanism; 1104. Third attachment machine; 1105. First pump body turning mechanism; 12. Installation station for filter element rubber rod and filter element cover; 1201. Fifth manipulator; 1202. Sixth manipulator; 1203. Filter element rubber rod feeding mechanism; 1204. Filter element cover feeding mechanism; 1205. Cap screwing device; 1206. Second pump body turning mechanism; 13. Double-layer double-speed chain conveyor line; 14. Lifting and positioning mechanism; 1401. First profile frame; 1402. Roller conveyor line; 1403. Roller motor; 1404. Positioning pin; 15. First elevator; 1501. Second profile frame; 1502. Belt conveying mechanism; 1503. Driving motor; 1504. Lifting cylinder; 16. First airtightness detection station; 17. First defective product rejection mechanism; 18. Wiring harness arrangement station; 19. Upper cover attachment station; 20. Lower cover attachment station; 21. Second airtightness detection station; 22. Second defective product rejection mechanism; 23. Waterproof breathable cap assembly station; 24. Second elevator; 25. Comprehensive performance detection station; 26. Tooling plate; 2601. Insert block; 2602. Buffer rubber block; 2603. Bottom induction iron block; 2604. Side induction iron block; 2605. Magnetic iron block; 2606. Positioning post; 27. Lifting and clamping cylinder; 28. Airtightness detection table; 2801. Pressing and fixing cylinder; 2802. Sealing component; 2803. Pushing cylinder; 2804. Mounting frame. Detailed implementation manners

[0053] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0054] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0055] As Figure 1-16 shown, a production line applicable to urea pump assembly includes a manual assembly line, an automatic assembly line, and an inspection line. The manual assembly line, the automatic assembly line, and the inspection line are connected in sequence. The manual assembly line is used to convey the simply assembled urea pump assembly to the automatic assembly line for assembly. The automatic assembly line is used to install the core parts on the urea pump assembly and convey the urea pump assembly with the core parts installed to the inspection line. The inspection line is used to assemble the urea pump assembly into a complete urea pump and detect the performance of the urea pump.

[0056] The automatic assembly line includes a gantry truss 8 and a pressure sensor and a PP pump installation station 9, an SP pump installation station 10, a pipe joint and fixed piece installation station 11, and a filter element rubber rod and filter element cover installation station 12 sequentially arranged along the gantry truss 8.

[0057] The inspection line includes a double-layer double-speed chain conveyor line 13, a lifting and positioning mechanism 14, a first elevator 15, a first airtightness detection station 16, a first defective product rejection mechanism 17, a wire harness sorting station 18, an upper cover locking station 19, a lower cover locking station 20, a second airtightness detection station 21, a second defective product rejection mechanism 22, a waterproof breathable cap assembly station 23, and a second elevator 24 sequentially arranged along the double-layer double-speed chain conveyor line 13. A comprehensive performance detection station 25 is arranged on one side of the tail end of the double-layer double-speed chain conveyor line 13.

[0058] The manual assembly line is used to convey the urea pump assembly after simple assembly to the pressure sensor and PP pump installation station 9. The pressure sensor and PP pump installation station 9 is used to clamp the urea pump assembly and install the pressure sensor and PP pump on the urea pump assembly. The SP pump installation station 10 is used to clamp the urea pump assembly with the pressure sensor and PP pump installed on the pressure sensor and PP pump installation station 9 and install the SP pump on the urea pump assembly. The pipe joint and fixing piece installation station 11 is used to clamp the urea pump assembly with the SP pump installed on the SP pump installation station 10 and install the pipe joint and fixing piece on the urea pump assembly. The filter element rubber rod and filter element cover installation station 12 is used to clamp the urea pump assembly with the pipe joint and fixing piece installed on the pipe joint and fixing piece installation station 11 and install the filter element rubber rod and filter element cover on the urea pump assembly. The filter element rubber rod and filter element cover installation station 12 is also used to clamp and move the urea pump assembly with the filter element rubber rod and filter element cover installed to the lifting and positioning mechanism 14.

[0059] The lifting and positioning mechanism 14 is used to position and fix the tooling plate 26 after detecting the tooling plate 26. The tooling plate 26 is used to fixedly place the filter element rubber rod and the urea pump assembly transported from the filter element cover installation station 12. The lifting and positioning mechanism 14 is used to lift and transport the tooling plate 26 with the installed urea pump assembly to the lifting mechanism after detecting that the urea pump assembly is placed properly. The first elevator 15 is used to transport the tooling plate 26 to the upper conveyor line of the double-speed chain conveyor line 13 after detecting the tooling plate 26 with the installed urea pump assembly. The double-speed chain conveyor line 13 is used to transport the tooling plate 26 with the installed urea pump assembly to the airtightness detection station through the upper conveyor line. The first airtightness detection station 16 is used to detect the airtightness inside the urea pump assembly after detecting the urea pump assembly, and send an allow-through signal to the first defective product rejection mechanism 17 when the detection is qualified, and send a non-allow-through signal to the first defective product rejection mechanism 17 when the detection is unqualified. The first defective product rejection mechanism 17 is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet after receiving the non-allow-through signal. The upper conveyor line is used to sequentially transport the qualified urea pump assemblies with qualified airtightness to the wire harness arrangement station 18, the upper cover locking station 19 and the lower cover locking station 20. The upper cover locking station 19 is used to install and lock the upper cover on the urea pump assembly. The lower cover locking station 20 is used to install and lock the lower cover on the urea pump assembly. The upper conveyor line is used to transport the urea pump assembly with the installed lower cover to the second airtightness detection station 21. The second airtightness detection station 21 is used to detect the airtightness between the urea pump assembly and the upper cover and the lower cover after detecting the urea pump assembly with the installed lower cover, and send an allow-through signal to the second defective product rejection mechanism 22 when the detection is qualified, and send a non-allow-through signal to the second defective product rejection mechanism 22 when the detection is unqualified. The second defective product rejection mechanism 22 is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet and alarm for waiting for processing after receiving the non-allow-through signal. The upper conveyor line is used to transport the qualified urea pump assemblies with qualified airtightness to the waterproof breather cap assembly station 23. The waterproof breather cap assembly station 23 is used to install the waterproof breather cap on the urea pump assembly after detecting the urea pump assembly with qualified airtightness to form a complete urea pump. The comprehensive performance test station is used to remove the complete urea pump from the tooling plate 26, detect the working performance of the complete urea pump, store the defective products and the qualified products separately, and continue to transport the empty tooling plate 26 forward to the second elevator 24;The second elevator 24 is used to lower and convey the empty mounting plate to the lower conveyor line. The lower conveyor line is used to convey the tooling plate 26 in the reverse direction to the front end of the lower conveyor line. The first elevator 15 is used to lower and lift the tooling plate 26 on the lower conveyor line and convey it to the jacking and positioning mechanism 14 to wait for the placement of the urea pump assembly when the jacking and positioning mechanism 14 does not detect the tooling plate 26;

[0060] After the defective urea pump assemblies at the first defective product rejection mechanism 17 and the second defective product rejection mechanism 22 are processed, the first defective product rejection mechanism 17 and the second defective product rejection mechanism 22 are used to push the empty tooling plate 26 back to the upper conveyor line for recycling.

[0061] A tooling plate sensor for detecting whether there is a tooling plate 26 is provided on the jacking and positioning mechanism 14. Urea pump sensors are provided at preset heights on the upper sides of the jacking and positioning mechanism 14, the first elevator 15, the first airtightness detection station 16, the first defective product rejection mechanism 17, the wire harness sorting station 18, the upper cover locking station 19, the lower cover locking station 20, the second airtightness detection station 21, the second defective product rejection mechanism 22, the waterproof breathable cap assembly station 23, and the second elevator 24. When a urea pump is installed on the tooling plate 26, the urea pump sensor can detect it and send a signal to the corresponding station, and the corresponding station performs corresponding actions. When the empty tooling plate 26 passes by, the urea pump sensor cannot detect it, and the corresponding station does not perform corresponding actions and directly allows the empty tooling plate 26 to pass by. The upper conveyor line directly conveys the empty tooling plate 26 to the second elevator 24 for recycling.

[0062] Specifically, the manual assembly line includes two non-powered roller conveyor lines 1 arranged side by side, a temperature sensor and heating blanket installation station 2 arranged sequentially along the outer non-powered roller conveyor line 1, a heating blanket back attachment station 3, a runner block seal ring and runner block installation station 4, a heating blanket front attachment station 5, an overflow conduit, a PP pump seal ring and an SP pump seal ring installation station 6, and two non-powered bull's-eye wheel conveyor mechanisms 7. Lifting and clamping cylinders 27 are provided at the temperature sensor and heating blanket installation station 2, the heating blanket back attachment station 3, the runner block seal ring and runner block installation station 4, the heating blanket front attachment station 5, and the overflow conduit, PP pump seal ring and SP pump seal ring installation station 6. The clamping and releasing actions of the lifting and clamping cylinders 27 on the manual assembly line are controlled by manually pressing buttons by workers. The two non-powered bull's-eye wheel conveyor mechanisms 7 are respectively located at the head and tail ends of the two side-by-side non-powered roller conveyor lines 1. The two non-powered bull's-eye wheel conveyor mechanisms 7 and the two side-by-side non-powered roller conveyor lines 1 form a non-powered circulating conveyor line. A plurality of tooling plates 26 are arranged on the non-powered circulating conveyor line. At the temperature sensor and heating blanket installation station 2, the worker places the middle housing face up on the tooling plate 26, then installs the temperature sensor on the middle housing, and then attaches the heating blanket to the back of the middle housing and tightens the three bolts on the back. The heating blanket extends from the back of the middle housing to the front of the middle housing. The worker pushes the middle housing with the heating blanket attached to the heating blanket back attachment station 3. At the heating blanket back attachment station 3, the worker tightens the remaining seven bolts on the back of the heating blanket and pushes it to the runner block seal ring and runner block installation station 4. At the runner block seal ring and runner block installation station 4, the worker first installs the runner block seal ring at the designated position on the back of the middle housing, then installs the runner block outside the seal ring and pushes it to the heating blanket front attachment station 5. At the heating blanket front attachment station 5, the worker flips the middle housing to the front and tightens the three bolts on the front of the heating blanket, and then pushes it to the overflow conduit, PP pump seal ring and SP pump seal ring installation station 6. At the overflow conduit, PP pump seal ring and SP pump seal ring installation station 6, the overflow conduit, the PP pump seal ring and the SP pump seal ring are sequentially installed to form a preliminarily assembled urea pump assembly. The worker places the preliminarily assembled urea pump assembly on the pump body feeding mechanism 903 and conveys it to the automatic assembly line. The remaining empty tooling plates 26 are moved by the worker through the non-powered bull's-eye wheel conveyor mechanism 7 at the tail end to the inner non-powered roller conveyor line 1, and then the worker pushes the empty tooling plates 26 along the inner non-powered roller conveyor line 1 to the non-powered bull's-eye wheel conveyor mechanism 7 at the head end, and is conveyed by the non-powered bull's-eye wheel conveyor mechanism 7 at the head end to the outer non-powered roller conveyor line 1 to form a cycle.

[0063] Specifically, the pressure sensor feeding mechanism 904, the PP pump feeding mechanism 905, the SP pump feeding mechanism 1002, the pipe joint feeding mechanism 1102, and the filter element rubber rod feeding mechanism 1203 are all tray feeding mechanisms.

[0064] The tray loading mechanism includes a frame, a truss, a full tray supporting mechanism, an empty tray supporting mechanism, a first cylinder, a second cylinder, a third cylinder, a first feeding plate, a second feeding plate, and a third feeding plate; a control box is further provided on the frame, and the control box is used to control the initial start of the full tray supporting mechanism and the empty tray recycling mechanism during each feeding.

[0065] Specifically, the first pump body flipping mechanism 1105 and the second pump body flipping mechanism 1206 are both provided with a base, a mounting plate, a pressing cylinder, and a telescopic cylinder. A mounting plate for placing the urea pump assembly is rotatably provided on the base. A pressing cylinder for fixing the urea pump assembly is provided on the mounting plate. A telescopic cylinder for flipping the mounting plate is provided on the base. A rotary cylinder and a fixing piece clamping rod are further provided on the first pump body flipping mechanism 1105. A rotary cylinder for rotating the fixing piece clamping rod is provided at the bottom of the mounting plate. The fixing piece clamping rod is used to rotate and clamp the fixing piece and the pipe joint.

[0066] As an implementation manner, the tooling plate 26 includes an insert block 2601, a buffer rubber block 2602, a bottom induction iron block 2603, a side induction iron block 2604, and a magnetic attraction iron block 2605. A plurality of insert blocks 2601 are arranged inside the positioning holes on the tooling plate 26. The plurality of insert blocks 2601 are used to cooperate with the lifting and positioning mechanism 14 to fix the tooling plate 26 and reduce the wear of the tooling plate 26. Buffer rubber blocks 2602 are arranged on the front and rear sides of the tooling plate 26. The buffer rubber blocks 2602 are used to reduce the impact noise between two adjacent tooling plates 26. A bottom induction iron block 2603 and a side induction iron block 2604 are respectively arranged on the bottom surface and the side surface of the tooling plate 26. The bottom induction iron block 2603 and the side induction iron block 2604 are both used to cooperate with the tooling plate sensor to sense the tooling plate 26. A magnetic attraction iron block 2605 is arranged on one of the left and right sides of the tooling plate 26. The magnetic attraction iron block 2605 is used to cooperate with the first defective product rejection mechanism 17 and the second defective product rejection mechanism 22 to transfer defective products. Positive fixing positions and reverse fixing positions for respectively placing the urea pump assembly in the forward and reverse directions are provided on the tooling plate 26. Both the positive fixing position and the reverse fixing position are composed of a plurality of positioning posts 2606 with different heights arranged according to the structure of the urea pump equipment body.

[0067] As an implementation manner, the pressure sensor and PP pump installation station 9 includes a first manipulator 901, a second manipulator 902, a pump body feeding mechanism 903, a pressure sensor feeding mechanism 904, a PP pump feeding mechanism 905, and a first locking machine 906. A pressure sensor clamping claw and a pump body clamping claw are arranged on the first manipulator 901. The first manipulator 901 is used to first clamp the pressure sensor conveyed by the pressure sensor feeding mechanism 904 with the pressure sensor clamping claw and then lift and rotate to replace it with the pump body clamping claw. The first manipulator 901 is used to clamp the urea pump assembly with the pump body clamping claw and place it on the first locking machine 906 after the pump body feeding mechanism 903 detects that the conveyed urea pump assembly reaches the clamping designated position. A PP pump clamping claw and a pump body clamping claw are arranged on the second manipulator 902. The second manipulator 902 is used to first clamp the PP pump conveyed by the PP pump feeding mechanism 905 with the PP pump clamping claw before the first manipulator 901 places the urea pump assembly. The first locking machine 906 is used to fix the urea pump assembly after detecting the urea pump assembly. The first manipulator 901 is used to first lift and rotate to replace it with the pressure sensor clamping claw after the urea pump assembly is fixed and then place the pressure sensor on the urea pump assembly with the pressure sensor clamping claw. The second manipulator 902 is used to place the PP pump on the urea pump assembly on which the pressure sensor is placed after the first locking machine 906 detects the installation of the pressure sensor. The first locking machine 906 is used to lock the pressure sensor and the PP pump to the urea pump assembly with bolts after detecting that both the pressure sensor and the PP pump are placed on the urea pump assembly.

[0068] The SP pump installation station 10 includes a third manipulator 1001, an SP pump feeding mechanism 1002, and a second locking machine 1003. An SP pump clamping claw and a pump body clamping claw are arranged on the third manipulator 1001. The second manipulator 902 is also used to clamp the urea pump assembly with the pressure sensor and the PP pump installed thereon at the pressure sensor and PP pump installation station 9 with the pump body clamping claw and place it on the second locking machine 1003. The third manipulator 1001 is used to clamp the SP pump conveyed by the SP feeding mechanism with the SP pump clamping claw before the second manipulator 902 clamps and places the urea pump assembly. The second locking machine 1003 is used to fix the urea pump assembly after detecting the urea pump assembly. The third manipulator 1001 is used to place the SP pump on the urea pump assembly after the urea pump assembly is fixed and then lift and rotate the clamping end to transform it into the pump body clamping claw. The second locking machine 1003 is also used to lock the SP pump to the urea pump assembly with bolts after detecting the placement of the SP pump.

[0069] Specifically, the pump body feeding mechanism 903 is a belt conveyor feeding mechanism. An interception device composed of a photoelectric sensor and a cylinder is arranged on the belt conveyor of the pump body feeding mechanism 903. Only one material can pass through to the clamping position each time, ensuring the orderly transportation of materials.

[0070] As an implementation manner, the pipe joint and fixed piece installation station 11 includes a fourth manipulator 1101, a pipe joint feeding mechanism 1102, a fixed piece feeding mechanism 1103, a third locking machine 1104, and a first pump body flipping mechanism 1105.

[0071] One side of the output end of the fixed piece feeding mechanism 1103 is provided with a first pump body flipping mechanism 1105. One side of the first pump body flipping mechanism 1105 is provided with a third locking machine 1104. The fourth manipulator 1101 is located above the first pump body flipping mechanism 1105. The fourth manipulator 1101 realizes horizontal movement through a guide rail. The fourth manipulator 1101 includes a pipe joint clamping claw and a fixed piece clamping claw.

[0072] The fixed piece feeding mechanism 1103 includes a lead screw slide rail, a stock plate, a push block, and a support plate. Both the left and right sides of the lead screw slide rail are provided with support plates parallel to the lead screw slide rail. On the relative sides of the upper surfaces of the two support plates, chutes are horizontally arranged. The two chutes are used to support the two ends of the fixed piece. The two ends of the support plate are respectively a feeding end and a discharging end. A stock plate is horizontally arranged above the feeding end. A blanking through hole is arranged in the middle of the stock plate. A fixed piece limiting plate and a fixed piece limiting column are respectively arranged on the front and rear sides of the blanking through hole. The fixed piece limiting plate and the fixed piece limiting column are used for stacking and placing fixed pieces. The lowermost one of a stack of fixed pieces is located at the feeding end. Multiple fixed pieces are stacked and placed on the chutes inside the through hole. The lead screw slide rail is used to push the fixed piece at the feeding end forward along the chute to the discharging end through the push block.

[0073] The third manipulator 1001 is further configured to use the pump body clamping claws to pick up and place the urea pump assembly with the SP pump installed at the SP pump installation station 10 on the first pump body flipping mechanism 1105 of the pipe joint and fixing plate installation station 11. The fourth manipulator 1101 is configured to, before the third manipulator 1001 places the urea pump assembly, use the pipe joint clamping claws to simultaneously pick up a set of three pipe joints on the pipe joint feeding mechanism 1102 and lift them, and rotate the clamping end to replace it with the fixing plate clamping claws. The fourth manipulator 1101 is further configured to, after picking up the pipe joints, use the fixing plate clamping claws to pick up the fixing plates conveyed by the fixing plate feeding mechanism 1103 and lift them, and rotate the clamping end to replace it with the pipe joint clamping claws. The first pump body flipping mechanism 1105 is configured to clamp and fix the urea pump assembly; the first pump body flipping mechanism 1105 is further configured to drive the urea pump assembly to flip from a horizontal state to a vertical state after clamping and fixing the urea pump assembly. The fourth manipulator 1101 is configured to install the three pipe joints at corresponding positions on the urea pump assembly simultaneously after detecting that the flipping of the urea pump assembly is completed. The fourth manipulator 1101 is further configured to lift and rotate the clamping end to replace it with the fixing plate clamping claws after installing the pipe joints and install the fixing plates on the outer sides of the pipe joints of the urea pump assembly. After the sensor at the discharging end of the fixing plate feeding mechanism 1103 detects that the fixing plates are picked up, the first lead screw guide drives the push block to reset, and then pushes the next fixing plate to move to the discharging end again, repeating the process of picking up and installing the fixing plates. The third locking machine 1104 is configured to lock the fixing plates to the urea pump assembly through bolts to uniformly fix the three pipe joints. After the third locking machine 1104 locks the fixing plates, the first pump body flipping mechanism 1105 flips the urea pump assembly from a vertical state to a horizontal state and releases the fixation of the urea pump assembly.

[0074] Specifically, the fixing plate limiting post is adapted to the shape of the fixing plate. A groove is provided at a corresponding position in the recess on the outer side of the fixing plate, and it can only be placed between the fixing plate limiting plate and the fixing plate limiting post when the fixing plate is placed correctly in the front-back direction. The cavity between the lower surface of the storage plate and the upper surface of the chute at the feeding end can only accommodate one fixing plate. The upper surface of the push block is an inclined surface with the front higher than the rear, so that when the push block moves forward, it can smoothly push a fixing plate at the feeding end forward, and when moving backward, it can move under the fixing plate at the feeding end to the initial position without being blocked by the fixing plate at the feeding end.

[0075] As an implementation manner, the filter element rubber rod and filter element cover installation station 12 includes a fifth manipulator 1201, a sixth manipulator 1202, a filter element rubber rod feeding mechanism 1203, a filter element cover feeding mechanism 1204, a capping device 1205, and a second pump body flipping mechanism 1206. The fifth manipulator 1201 is provided with pump body clamping claws and filter element rubber rod clamping claws, and the sixth manipulator 1202 is only provided with pump body clamping claws.

[0076] The filter element cover feeding mechanism 1204 includes a frame, a plurality of material racks, a pushing cylinder, a belt conveyor, a blocking cylinder, a clamping and positioning cylinder, a cover plate and a limiting rod.

[0077] A plurality of material racks for stacking and placing filter element covers are arranged side by side on the frame. Pushing cylinders are arranged on the plurality of material racks. A belt conveyor passing below the output ends of the plurality of material racks is arranged on the frame. A through hole for dropping the filter element cover onto the belt conveyor is formed at the front end of the material rack. A blocking cylinder and a clamping and positioning cylinder are sequentially installed at the tail end of the belt conveyor. A cover plate is arranged on the material rack on the front side of the pushing end of the pushing cylinder. The cover plate is used to limit the number of filter element covers pushed by the pushing cylinder at one time. A cavity is formed between the cover plate and the material rack, and only one filter element cover can be accommodated in the cavity at a time. A leakage hole for leaking the filter element cover is formed at the top of the cover plate. A plurality of limiting rods for restricting the movement of the filter element cover are vertically arranged around the through hole. A plurality of filter element covers are stacked between the plurality of limiting rods.

[0078] The cap screwing device 1205 includes a cap screwing motor, a pressing and resetting cylinder, a cap screwing clamp, a cylinder support frame, a connecting plate, a precision reducer, a stabilizing plate and a first buffer.

[0079] An electric slide rail is arranged at the bottom of the cap screwing device 1205. A cylinder support frame is arranged on the electric slide rail. A pressing and resetting cylinder for pushing the connecting plate to rise or fall is arranged on the cylinder support frame. The connecting plate is slidably connected to a plurality of support columns of the cylinder support frame. A cap screwing motor for driving the cap screwing clamp to rotate is arranged on the connecting plate. A cap screwing clamp for clamping the filter element cover is arranged at the output end of the cap screwing motor. A precision reducer for reducing the rotation speed of the cap screwing clamp is arranged at the output end of the cap screwing motor. A stabilizing plate is arranged at the bottom of the connecting plate. A first buffer is arranged at the bottom of the cylinder support frame. The stabilizing plate is used to reduce the descending speed of the cap screwing clamp after contacting the first buffer so that the cap screwing clamp can stably press into the filter element cover. The outer surface of the cap screwing clamp is circular and adapted to the inner surface of the outer cap. A plurality of elastic metal sheets are arranged on the outer surface of the cap screwing clamp. When the cap screwing clamp presses into the filter element cover, the elastic metal sheets contact the inner surface of the filter element cover to generate an elastic squeezing force to clamp the filter element cover. The inner surface of the cap screwing clamp is a ring tooth adapted to the outer surface of the inner circle of the filter element cover. When the cap screwing clamp rotates to screw the filter element cover into the housing, the ring tooth can prevent relative sliding between the cap screwing clamp and the filter element cover.

[0080] The fifth manipulator 1201 is used to first clamp the filter element rubber rod conveyed by the filter element rubber rod feeding mechanism 1203 with the filter element rubber rod clamping jaw, lift it, and rotate the clamping end to replace it with the pump body clamping jaw. The fifth manipulator 1201 is also used to clamp the urea pump assembly with the pipe joint and the fixing piece installed at the pipe joint and fixing piece installation station 11 with the pump body clamping jaw, place it on the second pump body flipping mechanism 1206, lift it, and rotate the clamping end to replace it with the filter element rubber rod clamping jaw. The second pump body flipping mechanism 1206 is used to fix and lock the urea pump assembly after detecting the urea pump assembly, and flip the urea pump assembly from the horizontal state to the vertical state. The fifth manipulator 1201 is used to place the filter element rubber rod on the urea pump assembly after detecting that the urea pump assembly is flipped to the vertical state. The pushing cylinder is used to push the filter element cover to the through hole and drop it onto the belt conveyor after the sensor detects the filter element cover. Sensors for detecting whether there is a filter element cover at the feeding end of the intercepting cylinder and for detecting whether the filter element cover passes through the discharging end of the intercepting cylinder are respectively arranged at the feeding end and the discharging end of the intercepting cylinder. The intercepting cylinder is used to extend to intercept the subsequent filter element covers after both sensors detect the filter element cover, allowing only one filter element cover to pass through each time. A sensor for detecting whether the filter element cover reaches the clamping position is arranged at the clamping and positioning cylinder. The clamping and positioning cylinder is used to extend to clamp and position the filter element cover to the clamping position after the sensor detects the filter element cover. The electric slide rail is used to drive the capping device 1205 to move to the filter element cover clamping position after the clamping and positioning cylinder clamps the filter element cover. The pressing and resetting cylinder is used to extend downward to push the connecting plate to move a specified distance after moving to the filter element cover clamping position. The connecting plate is used to drive the capping fixture to move a specified distance and press it into the filter element cover. The pressing and resetting cylinder is used to contract upward to pull the connecting plate back to drive the capping fixture to clamp the filter element cover after the capping fixture presses into the filter element cover. The electric slide rail is used to drive the capping device 1205 to move to the specified filter element cover installation position after the connecting plate is reset. The pressing and resetting cylinder is used to extend downward to drive the capping fixture to move downward to the specified position after reaching the specified filter element cover installation position. The capping motor is used to drive the capping fixture to rotate to screw the filter element cover into the urea pump assembly while the capping fixture moves downward. The pressing and resetting cylinder is used to contract upward to drive the capping fixture to move out of the filter element cover and reset after the filter element cover is screwed into the urea pump assembly. The second pump body flipping mechanism 1206 is used to flip the urea pump assembly back to the horizontal state and release the fixation of the urea pump assembly after detecting that the filter element cover is screwed into the urea pump assembly. The sixth manipulator 1202 is used to clamp the urea pump assembly with the filter element rubber rod and the filter element cover installed and place it on the lifting and positioning mechanism 14.

[0081] Specifically, a plurality of sensors for detecting the number of stacked filter element covers on the material rack are arranged on the belt conveyor. When the number of filter element covers is less than the set number, the sensor controls the warning light to turn on.

[0082] As an implementation manner, lifting and clamping cylinders 27 for clamping and positioning the tooling plate 26 are provided on the manual assembly line, the double-layer double-speed chain conveyor line 13 and the lifting and positioning mechanism 14. There is one lifting and clamping cylinder 27 at each station on the double-layer double-speed chain conveyor line 13. When the urea pump sensor at the corresponding station detects that the urea pump assembly is installed on the tooling plate 26, the lifting and clamping cylinder 27 at the corresponding station will quickly rise to clamp and fix the tooling plate 26. When the urea pump sensor does not detect that the urea pump assembly is installed on the tooling plate 26, the lifting and clamping cylinder 27 will not rise.

[0083] As an implementation manner, the lifting and positioning mechanism 14 includes a first profile frame 1401, a roller conveyor line 1402, a roller motor 1403 and a positioning pin 1404. The roller conveyor line 1402 is horizontally arranged on the first profile frame 1401. The roller motor 1403 and the positioning pin 1404 are respectively arranged below the roller conveyor line 1402. The roller motor 1403 is used to drive the roller conveyor line 1402 to rotate in the same direction as the first elevator 15 to convey the tooling plate 26 onto the roller conveyor line 1402 after the tooling plate sensor does not detect the tooling plate 26. The positioning pin 1404 is used to jack up and position the tooling plate 26 by passing through between a plurality of inserts 2601 after the tooling plate sensor detects the tooling plate 26. The positioning pin 1404 is used to lower and release the positioning after the urea pump sensor detects that the urea pump assembly is placed on the tooling plate 26. The roller motor 1403 is used to drive the roller conveyor line 1402 to convey the tooling plate 26 onto the first elevator 15 after the positioning pin 1404 descends.

[0084] The first elevator 15 includes a second profile frame 1501, a belt conveyor mechanism 1502, a drive motor 1503 and a lifting cylinder 1504. The lifting cylinder 1504 is used to drive the belt conveyor mechanism 1502 to descend to be flush with the lower conveyor line when the tooling plate sensor of the lifting and positioning mechanism 14 does not detect the tooling plate 26. The drive motor 1503 is used to drive the belt conveyor mechanism 1502 to rotate in the same direction as the lower conveyor line to move the tooling plate 26 onto the belt conveyor mechanism 1502. The lifting cylinder 1504 is used to drive the belt conveyor mechanism 1502 to rise and reset. The drive motor 1503 is used to drive the belt conveyor mechanism 1502 to convey the tooling plate 26 to the lifting and positioning mechanism 14 after the belt conveyor mechanism 1502 resets. The drive motor 1503 is used to drive the belt conveyor mechanism 1502 to convey the tooling plate 26 to the upper conveyor line in the same direction as the upper conveyor line after the urea pump assembly is placed on the tooling plate 26 on the lifting and positioning mechanism 14. The second elevator 24 has the same structure and operating principle as the first elevator 15.

[0085] As an embodiment, the first air tightness testing station 16 and the second air tightness testing station 21 both include an air tightness testing device body and an air tightness testing platform 28, the air tightness testing platform 28 includes a pressing and fixing cylinder 2801, a sealing component 2802, a pushing cylinder 2803 and a mounting bracket 2804, the air tightness testing platform 28 is provided with a mounting bracket 2804, the mounting bracket 2804 is provided with a pushing cylinder 2803, the telescopic end of the pushing cylinder 2803 is provided with a sealing component 2802, the mounting bracket 2804 is provided with two pressing and fixing cylinders 2801 located on the left and right sides of the sealing component 2802, the sealing component 2802 of the first air tightness testing station 16 is three sealing joints corresponding to the three pipe joints, the sealing component 2802 of the second air tightness testing station 21 is A single sealing joint corresponding to the waterproof vent hole, an air tightness testing platform 28 is provided on the air tightness testing body, when the tooling plate 26 on which the urea pump assembly is placed is transported to the air tightness testing station, the lifting and clamping cylinder 27 lifts and fixes the tooling plate 26, and the pressing and fixing cylinder 2801 is used to descend and press and fix the urea pump assembly after the tooling plate 26 is fixed, and the pushing cylinder 2803 is used to push the sealing component 2802 to dock and seal the three pipe joints or waterproof vent holes on the urea pump assembly after the urea pump assembly is fixed, and the air tightness testing equipment body is used to inflate the inside of the urea pump assembly through the sealing component 2802 at the docking interface of the sealing component 2802 to detect the air tightness of the urea pump assembly, maintain the pressure for a certain period of time during inflation, and read the attenuation of the gas pressure in the pump. If the attenuation exceeds the specified value, it is unacceptable, otherwise it is qualified.

[0086] As an embodiment, the first defective product rejection mechanism 17 includes a push cylinder, an electromagnetic clamp and a defective product storage cabinet. The defective product storage cabinet is located on one side of the upper conveyor line. The push cylinder and the electromagnetic clamp are both located inside the defective product storage cabinet. When the urea pump sensor of the first defective product rejection mechanism 17 detects a defective urea pump assembly, the lifting and clamping cylinder 27 at the first defective product rejection mechanism 17 is used to lift and clamp the tooling plate 26, and the push cylinder is used to push the electromagnetic clamp toward the fixed tooling plate 26. The electromagnetic clamp is used to absorb and clamp the magnetic iron block 2605 on the tooling plate 26. The lifting and clamping cylinder 27 is used to lower and reset to release the clamping of the tooling plate 26 after the electromagnetic clamp absorbs and clamps the tooling plate 26. The pushing cylinder is used to pull the electromagnetic clamp to reset after the lifting and clamping cylinder 27 is lowered and reset. The reset of the electromagnetic clamp drives the tooling plate 26 and the defective urea pump assembly to the inside of the defective product storage cabinet and alarms. The second defective product rejection mechanism 22 is consistent with the first defective product rejection mechanism 17 in structure and operation principle.

[0087] As an implementation manner, the wire harness arrangement station 18, the upper cover locking station 19, the lower cover locking station 20, and the waterproof breathable cap assembly station 23 are all semi-automatic stations. The upper cover locking station 19 is provided with a fourth locking machine for installing the upper cover. The lower cover locking station 20 is provided with a fifth locking machine and a first flipping mechanism. The first flipping mechanism is used to flip the urea pump assembly with the upper cover installed by 180 degrees and place it on the reverse fixing position of the tooling plate 26. The fifth locking machine is used to install the lower cover on the flipped urea pump assembly. The waterproof breathable cap assembly station 23 is provided with a second flipping mechanism and a waterproof breathable cap installation mechanism. The second flipping mechanism is used to flip the urea pump assembly with the lower cover installed by 180 degrees again and place it on the forward fixing position of the tooling plate 26. The waterproof breathable cap installation mechanism is used to install the waterproof breathable cap on the flipped urea pump assembly. The wire harness arrangement station 18, the upper cover locking station 19, the lower cover locking station 20, and the waterproof breathable cap assembly station 23 are all provided with reset buttons. After the reset buttons are triggered, they are used to lower and reset the lifting and clamping cylinders 27 of the corresponding stations to release the tooling plate 26 and convey it to the next station.

[0088] Specifically, the fourth locking machine and the fifth locking machine are electric locking machines manually operated by workers. The first flipping mechanism and the second flipping mechanism do not have specific mechanical structures, but are both manually flipped by workers, and the urea pump assembly is flipped 180 degrees manually by workers.

[0089] The working process of the present invention:

[0090] When the manual assembly line starts running, the operator places the middle housing face up on the tooling plate 26 at the starting end of the outer roller conveyor line 1402. At the temperature sensor and heating blanket installation station 2, press the button to control the lifting and clamping cylinder 27 to clamp the tooling plate 26, and then install the temperature sensor, attach the heating blanket to the back of the middle housing in sequence, and tighten the 3 bolts on the back. Subsequently, press the button to control the lifting and clamping cylinder 27 to release the tooling plate 26 and push it to the heating blanket back locking station 3. At the heating blanket back locking station 3, press the button to control the lifting and clamping cylinder 27 to clamp the tooling plate 26, and then the operator tightens the remaining 7 bolts on the back of the heating blanket to lock the back of the heating blanket and the back of the middle housing. After completing the back fixing, press the button to control the lifting and clamping cylinder 27 to release the tooling plate 26 and push it to the runner block seal and runner block installation station 4. At the runner block seal and runner block installation station 4, press the button to control the lifting and clamping cylinder 27 to clamp the tooling plate 26, and then the operator first installs the runner block seal at the designated position on the back of the middle housing, and then assembles the runner block outside the seal. After completion, press the button to control the lifting and clamping cylinder 27 to release the tooling plate 26 and push it to the heating blanket front locking station 5. At the heating blanket front locking station 5, press the button to control the lifting and clamping cylinder 27 to clamp the tooling plate 26, and then the operator flips the middle housing to the front, tightens the 3 bolts on the front of the heating blanket, and then the operator presses the button to control the lifting and clamping cylinder 27 to release the tooling plate 26 and push it to the overflow conduit, PP pump seal and SP pump seal installation station 6. At the overflow conduit, PP pump seal and SP pump seal installation station 6, press the button to control the lifting and clamping cylinder 27 to clamp the tooling plate 26, and then install the overflow conduit, PP pump seal and SP pump seal in sequence to form a preliminarily assembled urea pump assembly. Then press the button to control the lifting and clamping cylinder 27 to release the tooling plate 26 and transfer it to the pump body loading mechanism 903. The empty tooling plate 26 is turned to the inner roller conveyor line 1402 through the tail end bull's eye wheel mechanism, manually pushed to the head end bull's eye wheel mechanism, and then turned to the outer roller conveyor line 1402 to re-enter the cycle.

[0091] When the automatic assembly line starts running, first place various materials on the corresponding loading mechanisms, and all the loading mechanisms start to convey the corresponding materials.

[0092] The first manipulator 901 first uses the pressure sensor clamping jaws to pick up the pressure sensors conveyed by the pressure sensor feeding mechanism 904 and rises to the safe position, then rotates the clamping end to replace it with the pump body clamping jaws. At the same time, the second manipulator 902 uses the PP pump clamping jaws to pick up the PP pumps conveyed by the PP pump feeding mechanism 905. Then, the first manipulator 901 uses the pump body clamping jaws to pick up the urea pump assembly conveyed by the pump body feeding mechanism 903 and places the urea pump assembly on the first locking machine 906 and rises to the safe position, then rotates the clamping end to replace it with the pressure sensor clamping jaws. After detecting the urea pump assembly, the first locking machine 906 fixes the urea pump assembly. The first manipulator 901 places the pressure sensor on the fixed urea pump assembly and resets to move above the pressure sensor feeding mechanism 904 to pick up the next pressure sensor. Then, the second manipulator 902 moves above the first locking machine 906 to place the PP pump on the urea pump assembly on which the pressure sensor has been placed and rises to the safe position, then rotates the clamping end to replace it with the pump body clamping jaws. After the pressure sensor and the PP pump are both placed on the urea pump assembly, the first locking machine 906 uses bolts to lock the pressure sensor and the PP pump to the urea pump assembly. The second manipulator 902 uses the pump body clamping jaws to pick up the urea pump assembly with the pressure sensor and the PP pump installed at the pressure sensor and PP pump installation station 9 and places it on the second locking machine 1003 and resets to move above the PP pump feeding mechanism 905 to pick up the next PP pump.

[0093] Before the second manipulator 902 picks up the urea pump assembly, the third manipulator 1001 uses the SP pump clamping jaws to pick up the SP pumps conveyed by the SP feeding mechanism.

[0094] After detecting the urea pump assembly, the second locking machine 1003 fixes the urea pump assembly. After the second manipulator 902 returns to the pressure sensor and PP pump installation station 9, the third manipulator 1001 places the SP pump on the fixed urea pump assembly and rises to the safe position, then rotates the clamping end to replace it with the pump body clamping jaws. The second locking machine 1003 uses bolts to lock the SP pump to the urea pump assembly. The third manipulator 1001 uses the pump body clamping jaws to pick up the urea pump assembly with the SP pump installed at the SP pump installation station 10 and places it on the first pump body flipping mechanism 1105 at the pipe joint and fixing piece installation station 11 and resets to move above the SP pump feeding mechanism 1002 to pick up the next SP pump.

[0095] Before the third manipulator 1001 picks and places the urea pump assembly, the fourth manipulator 1101 first uses the pipe joint clamping claws to pick up a set of pipe joints conveyed by the pipe joint feeding mechanism 1102 and raises them to a safe position, and then rotates the clamping end to replace it with the fixing plate clamping claws. When the sensors on the fourth manipulator 1101 detect that the arrangement order of a set of three pipe joints on the pipe joint feeding mechanism 1102 does not correspond to the order of the three tubular clamping claws, the fourth manipulator 1101 skips this set of three pipe joints and picks up the next set of three pipe joints. Then, the fourth manipulator 1101 uses the fixing plate clamping claws to pick up the fixing plates conveyed by the fixing plate feeding mechanism 1103 and raises them to a safe position, and then rotates the clamping end to replace it with the pipe joint clamping claws.

[0096] After detecting the urea pump assembly, the first pump body flipping mechanism 1105 fixes and locks the urea pump assembly and flips the urea pump assembly from the horizontal state to the vertical state. After the fourth manipulator 1101 detects that the urea pump assembly has been flipped to the vertical state and the third manipulator 1001 returns to the SP pump installation station 10, it places the pipe joints on the urea pump assembly, raises them to a safe position, and rotates the clamping end to replace it with the fixing plate clamping claws.

[0097] When fixing plate feeding is required, the lead screw slide rail drives the push block to push the fixing plates to the grasping position. The push block can just push out one fixing plate when feeding. When the clamping sensor recognizes that the fourth manipulator 1101 has picked up the fixing plate, the lead screw slide rail retracts the push block to the initial position, and the remaining fixing plates are restricted by the stock plate. After the push block pushes out one fixing plate, the next fixing plate falls on the chute due to gravity. When the push block pushes the fixing plate to the specified position and returns and passes the fixing plate stock position again, the design of the push block with a higher front and a lower rear makes it not get stuck when retracting and does not affect the position of the fixing plate. After reaching the initial position, the push block continues to wait for the next feeding signal from the sensor at the front end of the support plate. When the sensor detects that the number of fixing plates is insufficient, it triggers a signal to remind the worker to replenish the materials. The fourth manipulator 1101 places the fixing plates on the urea pump assembly, raises them to a safe position, rotates the clamping end to replace it with the pipe joint clamping claws, and moves above the pipe joint feeding mechanism 1102 to pick up the next set of pipe joints. After the sensor on the first pump body flipping mechanism 1105 recognizes the fixing plates, the rotary cylinder rotates the fixing plate pressing rod to press the fixing plates.

[0098] After the three pipe joints and the fixing plates are in place, the third locking machine 1104 sucks the bolts and locks the fixing plates on the urea pump assembly. After locking, the third locking machine 1104 resets.

[0099] After the first pump body flipping mechanism 1105 detects the reset of the third locking machine 1104, the rotary cylinder drives the fixing plate pressing rod to reset, the telescopic cylinder extends the telescopic rod to push the mounting plate to flip and reset, and the pressing cylinder located on the mounting plate resets at the same time to release the fixation of the urea pump assembly.

[0100] The fifth manipulator 1201 uses the filter element rubber rod clamping claws to pick up the filter element rubber rod conveyed by the filter element rubber rod feeding mechanism 1203 and raises it to a safe position, then rotates the clamping end to replace it with the pump body clamping claws. Then, the fifth manipulator 1201 uses the pump body clamping claws to pick up the urea pump assembly with the pipe joint and the fixing piece installed at the pipe joint and fixing piece installation station 11 and places it on the second pump body turning mechanism 1206, and raises it to a safe position, then rotates the clamping end to replace it with the rubber rod clamping claws. After detecting the urea pump assembly, the second pump body turning mechanism 1206 fixes and locks the urea pump assembly and turns the urea pump assembly from a horizontal state to a vertical state. After detecting that the urea pump assembly has been turned to a vertical state, the fifth manipulator 1201 places the filter element rubber rod on the urea pump assembly and returns above the filter element rubber rod feeding mechanism 1203 to pick up the filter element rubber rod. When it is necessary to convey the filter element cover, the push cylinder on the material rack near the tail end of the belt conveyor gives priority to pushing. The sensor sends a start pushing signal to the push cylinder, and the push cylinder starts to push the filter element covers on the material rack one by one onto the belt conveyor. When the number of filter element covers is less than the specified number, the corresponding sensor lights up a red light to remind the staff to add filter element covers in time. After the filter element covers on the first material rack are pushed out, the sensor sends a stop pushing signal to the push cylinder, and the first material rack waits for the staff to add filter element covers. The sensor on the adjacent next material rack controls the push cylinder to start pushing the filter element covers until the filter element covers on the last material rack are pushed out, and a new round of pushing cycle starts.

[0101] The belt conveyor sequentially conveys the filter element covers to the tail end. After both sensors at the feeding end and the discharging end of the intercepting cylinder detect the filter element covers, the intercepting cylinder intercepts the filter element covers on the belt conveyor, and only one filter element cover is released at a time and moves to the clamping and positioning cylinder. The clamping and positioning cylinder clamps and positions the filter element cover. After the filter element cover is positioned, a clamping signal is sent to the lead screw slide rail and the cap screwing device 1205.

[0102] The electric slide rail drives the cap screwing device 1205 to move to the clamping position at the front end of the lead screw slide rail. The pressing and resetting cylinder pushes the connecting plate to descend. After the stabilizing plate contacts the first buffer, the descending speed of the cap screwing fixture is reduced. The pressing and resetting cylinder starts to drive the cap screwing fixture to press into the filter element cover. The elastic metal sheet on the cap screwing fixture clamps the filter element cover through elastic extrusion force. The pressing and resetting cylinder pushes the connecting plate to rise to clamp the filter element cover, and the intercepting cylinder releases one filter element cover to the clamping and positioning cylinder.

[0103] After the filter element rubber rod is installed, the electric slide rail drives the cap screwing device 1205 to move to the installation position at the rear end of the electric slide rail. The cap screwing fixture aligns with the installation position on the urea pump assembly. The pressing and resetting cylinder pushes the connecting plate downward. The cap screwing motor drives the cap screwing fixture to screw the filter element cap into the urea pump assembly and tighten it. The pressing and resetting cylinder pushes the connecting plate upward to pull out the cap screwing fixture from the filter element cap. After the second pump body flipping mechanism 1206 detects that the filter element cap is screwed into the urea pump assembly, the telescopic cylinder pushes the flipping mounting plate to reset. The pressing cylinder releases the fixation on the urea pump assembly. The sixth manipulator 1202 uses the pump body clamping claws to clamp and move the urea pump assembly installed with the filter element rubber rod and the filter element cap to the jacking and positioning mechanism 14

[0104] When the detection line starts to operate, after the lifting and positioning mechanism 14 fails to detect the empty tooling plate 26, the first elevator 15 descends to lift and convey the empty tooling plate 26 on the lower conveyor line to the lifting and positioning mechanism 14. After the lifting and positioning mechanism 14 detects the tooling plate 26, the positioning pins 1404 and the lifting and clamping cylinder 27 lift together to fix the tooling plate 26, waiting for the urea pump assembly to be placed. The urea pump assembly is placed on the tooling plate 26, and the lifting and positioning mechanism 14 lifts and conveys the tooling plate 26 with the urea pump assembly installed to the first elevator 15. The first elevator 15 conveys the tooling plate 26 to the upper conveyor line of the double-layer double-speed chain conveyor line 13. The tooling plate 26 passes through the first airtightness detection station 16. The lifting and clamping cylinder 27 rises to fix the tooling plate 26, the pressing and fixing cylinder 2801 descends to press and fix the urea pump assembly, and the pushing cylinder 2803 pushes the sealing component 2802 to dock and seal with the three pipe joints on the urea pump assembly. The airtightness detection equipment body inflates the inner side of the urea pump assembly through the sealing component 2802 to detect the airtightness inside the urea pump assembly. During inflation, pressure is maintained for a certain period of time, and the attenuation of the gas pressure in the pump is read. If the attenuation exceeds the specified value, it is defective; otherwise, it is qualified. If the airtightness is detected to be unqualified, the first defective product rejection mechanism 17 conveys the defective urea pump assembly to the corresponding defective product storage cabinet and alarms waiting for processing; if it is qualified, it continues to be conveyed. The tooling plate 26 is conveyed to the wire harness arrangement station 18, and the wire harness on the urea pump assembly is arranged manually. After the wire harness arrangement is completed, the operator manually presses the reset button, and the lifting and clamping cylinder 27 descends to reset and release the tooling plate 26. The upper conveyor line conveys the tooling plate 26 to the upper cover locking station 19. The operator operates the first locking machine 906 to install and lock the upper cover on the urea pump assembly. After the upper cover installation is completed, the operator manually presses the reset button, and the lifting and clamping cylinder 27 descends to reset and release the tooling plate 26. The upper conveyor line conveys the tooling plate 26 to the lower cover locking station 20. The operator turns the urea pump assembly over and operates the second locking machine 1003 to install and lock the lower cover on the urea pump assembly. After the lower cover installation is completed, the operator manually presses the reset button, and the lifting and clamping cylinder 27 descends to reset and release the tooling plate 26. The upper conveyor line conveys the tooling plate 26 to the second airtightness detection station 21, and the sealing component 2802 docks with the waterproof breathable hole to detect the airtightness between the urea pump assembly and the upper cover and the lower cover. If the airtightness is detected to be unqualified, the second defective product rejection mechanism 22 conveys the defective urea pump assembly to the corresponding defective product storage cabinet and alarms waiting for processing; if it is qualified, it continues to be conveyed.The tooling board 26 is transported to the waterproof breathable cap assembly station 23. The operator flips the urea pump assembly to the positive direction and installs the waterproof breathable cap to form a complete urea pump. After the installation of the waterproof breathable cap is completed, the operator manually presses the reset button, and the lifting and clamping cylinder 27 descends and resets to release the tooling board 26. The upper conveyor line transports the tooling board 26 to the comprehensive performance inspection station 25. The operator removes the complete urea pump from the tooling board 26 to inspect various working performances, and stores the defective products and non-defective products separately. The upper conveyor line continues to transport the empty tooling board 26 to the second elevator 24. After the second elevator 24 detects the empty tooling board 26, it descends and transports it to the lower conveyor line. The lower conveyor line transports the tooling board 26 in the reverse direction to the front end of the lower conveyor line. When the lifting positioning mechanism 14 of the first elevator 15 does not detect the tooling board 26, it descends to lift the tooling board 26 on the lower conveyor line and transports it to the lifting positioning mechanism 14 to wait for placing a new urea pump assembly.

[0105] The defective urea pump assemblies at the first defective product rejection mechanism 17 and the second defective product rejection mechanism 22 are taken away by the staff for processing. The first defective product rejection mechanism 17 and the second defective product rejection mechanism 22 push the empty tooling board 26 back to the upper conveyor line for recycling, and the empty tooling board 26 will not be stopped by the lifting and clamping cylinder 27.

[0106] When the tray loading mechanism works, the operator places the empty tray on the first feeding plate, and both the full tray supporting mechanism and the empty tray supporting mechanism are in the initial state. After the operator fills the tray placed on the first feeding plate with materials, the operator manually starts the control box switch to make the full tray supporting mechanism descend.

[0107] When the full tray supporting mechanism senses that the second feeding plate is flush with the first feeding plate, the stepping motor stops rotating and the full tray supporting mechanism stops descending. The operator pushes the full tray from the first feeding plate to the second feeding plate. The full tray supporting mechanism descends again to prepare to receive the next tray of materials. After the full tray supporting mechanism descends to a specified height, the motor stops rotating. The operator pushes the second full tray to the second feeding plate and repeats the above steps. When the full tray supporting mechanism detects that the bottom of the topmost tray on the second feeding plate is flush with the third feeding plate, the first air cylinder horizontally pushes the topmost tray onto the third feeding plate. After the third feeding plate detects the tray, the first air cylinder stops pushing and resets. The tray continues to move forward under the action of inertia until it contacts the oil buffer and stops at a specified position. At the same time, the positioning air cylinder rises to fix the tray. The external manipulator takes away the materials on the tray. When the materials on the tray are all grabbed, the external manipulator sends a signal to release the fixation to the positioning air cylinder. The positioning air cylinder descends to release the fixation of the tray. At the same time, the external manipulator sends a pushing signal to the second air cylinder. The second air cylinder pushes the empty tray to the left to the discharging position of the third feeding plate. After the third feeding plate detects that the empty tray has moved to the specified position of the discharging position, the empty tray supporting mechanism descends until the empty tray supporting mechanism senses that the second feeding plate is flush with the third feeding plate, and pushes the empty tray onto the empty tray supporting mechanism for placement. Then the second air cylinder sends a rising signal to the full tray supporting mechanism. The full tray supporting mechanism rises until the bottom of the topmost tray is flush with the third feeding plate. The first air cylinder drags the new tray onto the third feeding plate. Repeat the above steps until all the trays on the full tray supporting mechanism are pushed out, completing a large cycle. The operator pushes a new full tray onto the full tray supporting mechanism and recovers the empty trays on the empty tray supporting mechanism for the next cycle.

[0108] The above is an example of the best implementation mode of the present invention. The parts not described in detail are all common general knowledge of those skilled in the art. The protection scope of the present invention shall be subject to the content of the claims. Any equivalent transformation based on the technical inspiration of the present invention is also within the protection scope of the present invention.

Claims

1. A production line applicable to urea pump assembly, characterized in that, It includes a manual assembly line, an automatic assembly line and an inspection line. The manual assembly line, the automatic assembly line and the inspection line are connected in sequence. The manual assembly line is used to convey the preliminarily assembled urea pump assembly to the automatic assembly line for assembly. The automatic assembly line is used to install the core parts on the urea pump assembly and convey the urea pump assembly with the core parts installed to the inspection line. The inspection line is used to assemble the urea pump assembly into a complete urea pump and detect the performance of the urea pump. The automatic assembly line includes a gantry truss (8) and a pressure sensor and a PP pump installation station (9), an SP pump installation station (10), a pipe joint and a fixing piece installation station (11), and a filter element rubber rod and a filter element cover installation station (12) arranged in sequence along the gantry truss (8). The inspection line includes a double-layer double-speed chain conveyor line (13), a lifting and positioning mechanism (14), a first elevator (15), a first airtightness inspection station (16), a first defective product rejection mechanism (17), a wire harness arrangement station (18), an upper cover locking station (19), a lower cover locking station (20), a second airtightness inspection station (21), a second defective product rejection mechanism (22), a waterproof breathable cap assembly station (23) and a second elevator (24) arranged in sequence from front to back along the double-layer double-speed chain conveyor line (13). On one side of the tail end of the double-layer double-speed chain conveyor line (13), there is a comprehensive performance inspection station (25). The manual assembly line is used to convey the preliminarily assembled urea pump assembly to the pressure sensor and the PP pump installation station (9). The pressure sensor and the PP pump installation station (9) are used to clamp the urea pump assembly and install the pressure sensor and the PP pump on the urea pump assembly. The SP pump installation station (10) is used to clamp the urea pump assembly with the pressure sensor and the PP pump installed at the pressure sensor and the PP pump installation station (9) and install the SP pump on the urea pump assembly. The pipe joint and the fixing piece installation station (11) are used to clamp the urea pump assembly with the SP pump installed at the SP pump installation station (10) and install the pipe joint and the fixing piece on the urea pump assembly. The filter element rubber rod and the filter element cover installation station (12) are used to clamp the urea pump assembly with the pipe joint and the fixing piece installed at the pipe joint and the fixing piece installation station (11) and install the filter element rubber rod and the filter element cover on the urea pump assembly. The filter element rubber rod and the filter element cover installation station (12) is also used to clamp and move the urea pump assembly with the filter element rubber rod and the filter element cover installed to the lifting and positioning mechanism (14). The lifting and positioning mechanism (14) is used to position and fix the tooling plate (26) after detecting the tooling plate (26). The tooling plate (26) is used to fixedly place the filter element rubber rod and the urea pump assembly transported from the filter element cover installation station (12). The lifting and positioning mechanism (14) is used to lift and transport the tooling plate (26) installed with the urea pump assembly to the lifting mechanism after detecting that the urea pump assembly is placed well. The first elevator (15) is used to transport the tooling plate (26) to the upper conveyor line of the double-speed chain conveyor line (13) after detecting the tooling plate (26) installed with the urea pump assembly. The double-speed chain conveyor line (13) is used to transport the tooling plate (26) installed with the urea pump assembly to the airtightness detection station through the upper conveyor line. The first airtightness detection station (16) is used to detect the airtightness inside the urea pump assembly after detecting the urea pump assembly, and send an allow-through signal to the first defective product rejection mechanism (17) when the detection is qualified, and send a non-allow-through signal to the first defective product rejection mechanism (17) when the detection is unqualified. The first defective product rejection mechanism (17) is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet after receiving the non-allow-through signal. The upper conveyor line is used to sequentially transport the good urea pump assemblies with qualified airtightness to the wire harness sorting station (18), the upper cover locking station (19), and the lower cover locking station (20). The upper cover locking station (19) is used to install and lock the upper cover on the urea pump assembly. The lower cover locking station (20) is used to install and lock the lower cover on the urea pump assembly. The upper conveyor line is used to transport the urea pump assembly installed with the lower cover to the second airtightness detection station (21). The second airtightness detection station (21) is used to detect the airtightness between the urea pump assembly and the upper cover and the lower cover after detecting the urea pump assembly installed with the lower cover, and send an allow-through signal to the second defective product rejection mechanism (22) when the detection is qualified, and send a non-allow-through signal to the second defective product rejection mechanism (22) when the detection is unqualified. The second defective product rejection mechanism (22) is used to transport the defective urea pump assembly with unqualified airtightness to the corresponding defective product storage cabinet and alarm for waiting for processing after receiving the non-allow-through signal. The upper conveyor line is used to transport the good urea pump assemblies with qualified airtightness to the waterproof breathable cap assembly station (23). The waterproof breathable cap assembly station (23) is used to install the waterproof breathable cap on the urea pump assembly to form a complete urea pump after detecting the urea pump assembly with qualified airtightness. The comprehensive performance test station is used to remove the complete urea pump from the tooling plate (26) and place it on the comprehensive performance detection equipment to detect the various working performances of the complete urea pump and store the defective products and good products separately. The empty tooling plate (26) continues to be transported forward to the second elevator (24). The second elevator (24) is used to lower and transport the empty mounting plate to the lower conveyor line.The lower conveyor line is used to convey the tooling plate (26) in the reverse direction to the front end of the lower conveyor line. The first elevator (15) is used to lower and lift the tooling plate (26) on the lower conveyor line and convey it to the lifting and positioning mechanism (14) to wait for the placement of the urea pump assembly when the lifting and positioning mechanism (14) does not detect the tooling plate (26). After the defective product urea pump assemblies at the first defective product rejection mechanism (17) and the second defective product rejection mechanism (22) are processed, the first defective product rejection mechanism (17) and the second defective product rejection mechanism (22) are used to push the empty tooling plate (26) back to the upper conveyor line for circulation. The jacking and positioning mechanism (14) is provided with a tooling board sensor for detecting whether there is a tooling board (26). At a preset height on the upper side of the jacking and positioning mechanism (14), the first elevator (15), the first airtightness detection station (16), the first defective product rejection mechanism (17), the wire harness arrangement station (18), the upper cover locking station (19), the lower cover locking station (20), the second airtightness detection station (21), the second defective product rejection mechanism (22), the waterproof breathable cap assembly station (23), and the second elevator (24), there is a urea pump sensor. When a urea pump is installed on the tooling board (26), the urea pump sensor can detect it and send a signal to the corresponding station, and the corresponding station performs corresponding actions. When an empty tooling board (26) passes by, the urea pump sensor cannot detect it, and the corresponding station does not perform corresponding actions and directly allows the empty tooling board (26) to pass through. The upper-layer conveyor directly transports the empty tooling board (26) to the second elevator (24) for circulation.

2. The production line applicable to urea pump assembly according to claim 1, wherein The tooling board (26) includes inserts (2601), buffer rubber blocks (2602), bottom induction iron blocks (2603), side induction iron blocks (2604), and magnetic attraction iron blocks (2605). A plurality of inserts (2601) are arranged inside the positioning holes on the tooling board (26). The plurality of inserts (2601) are used to cooperate with the jacking and positioning mechanism (14) to fix the tooling board (26) and reduce the wear of the tooling board (26). Buffer rubber blocks (2602) are arranged on the front and rear sides of the tooling board (26). The buffer rubber blocks (2602) are used to reduce the impact noise between two adjacent tooling boards (26). A bottom induction iron block (2603) and a side induction iron block (2604) are respectively arranged on the bottom surface and the side surface of the tooling board (26). The bottom induction iron block (2603) and the side induction iron block (2604) are both used to cooperate with the tooling board sensor to sense the tooling board (26). A magnetic attraction iron block (2605) is arranged on one of the left and right sides of the tooling board (26). The magnetic attraction iron block (2605) is used to cooperate with the first defective product rejection mechanism (17) and the second defective product rejection mechanism (22) to transfer defective products. On the tooling board (26), there are a forward fixing position and a reverse fixing position for respectively placing the urea pump assembly in the forward and reverse directions. Both the forward fixing position and the reverse fixing position are composed of a plurality of positioning posts (2606) arranged according to the structure of the urea pump equipment body with different heights.

3. The production line applicable to urea pump assembly according to claim 1, characterized in that, The pressure sensor and PP pump installation station (9) includes a first manipulator (901), a second manipulator (902), a pump body feeding mechanism (903), a pressure sensor feeding mechanism (904), a PP pump feeding mechanism (905), and a first locking machine (906). A pressure sensor clamping jaw and a pump body clamping jaw are provided on the first manipulator (901). The first manipulator (901) is used to first pick up the pressure sensor conveyed by the pressure sensor feeding mechanism (904) with the pressure sensor clamping jaw and then lift and rotate to replace it with the pump body clamping jaw. The first manipulator (901) is used to pick up the urea pump assembly conveyed by the pump body feeding mechanism (903) with the pump body clamping jaw and place it on the first locking machine (906) after the pump body feeding mechanism (903) detects that the conveyed urea pump assembly reaches the picking position. A PP pump clamping jaw and a pump body clamping jaw are provided on the second manipulator (902). The second manipulator (902) is used to pick up the PP pump conveyed by the PP pump feeding mechanism (905) with the PP pump clamping jaw before the first manipulator (901) places the urea pump assembly. The first locking machine (906) is used to fix the urea pump assembly after detecting it. The first manipulator (901) is used to first lift and rotate to replace it with the pressure sensor clamping jaw after the urea pump assembly is fixed, and then place the pressure sensor on the urea pump assembly with the pressure sensor clamping jaw. The second manipulator (902) is used to place the PP pump on the urea pump assembly on which the pressure sensor has been placed after the first locking machine (906) detects the installation of the pressure sensor. The first locking machine (906) is used to lock the pressure sensor and the PP pump to the urea pump assembly with bolts after detecting that both the pressure sensor and the PP pump are placed on the urea pump assembly. The SP pump installation station (10) includes a third manipulator (1001), an SP pump feeding mechanism (1002), and a second locking machine (1003). An SP pump clamping jaw and a pump body clamping jaw are provided on the third manipulator (1001). The second manipulator (902) is also used to pick up the urea pump assembly with the pressure sensor and the PP pump installed on the pressure sensor and PP pump installation station (9) with the pump body clamping jaw and place it on the second locking machine (1003). The third manipulator (1001) is used to pick up the SP pump conveyed by the SP feeding mechanism with the SP pump clamping jaw before the second manipulator (902) picks up and places the urea pump assembly. The second locking machine (1003) is used to fix the urea pump assembly after detecting it. The third manipulator (1001) is used to place the SP pump on the urea pump assembly after the urea pump assembly is fixed and then lift and rotate the clamping end to transform it into the pump body clamping jaw. The second locking machine (1003) is also used to lock the SP pump to the urea pump assembly with bolts after detecting the placement of the SP pump.

4. The production line applicable to urea pump assembly according to claim 1, characterized in that The pipe joint and fixing piece installation station (11) includes a fourth robot (1101), a pipe joint feeding mechanism (1102), a fixing piece feeding mechanism (1103), a third locking machine (1104), and a first pump body turning mechanism (1105). On one side of the output end of the fixing piece feeding mechanism (1103), there is a first pump body turning mechanism (1105). On one side of the first pump body turning mechanism (1105), there is a third locking machine (1104). The fourth robot (1101) is located above the first pump body turning mechanism (1105). The fourth robot (1101) moves horizontally through a guide rail. The fourth robot (1101) includes a pipe joint clamping claw and a fixing piece clamping claw. The fixing piece feeding mechanism (1103) includes a lead screw slide rail, a storage plate, a pushing block, and a support plate. On both the left and right sides of the lead screw slide rail, there are support plates parallel to the lead screw slide rail. On the opposite sides of the upper surfaces of the two support plates, there are horizontal chutes for supporting both ends of the fixing piece. The two ends of the support plate are respectively the feeding end and the discharging end. Above the feeding end, there is a horizontally arranged storage plate. In the middle of the storage plate, there is a blanking through hole. On the front and back sides of the blanking through hole, there are respectively a fixing piece limiting plate and a fixing piece limiting column. Between the fixing piece limiting plate and the fixing piece limiting column, the fixing pieces are stacked for placement. The lowermost one of a stack of fixing pieces is located at the feeding end. Multiple fixing pieces are stacked on the chute inside the through hole. The lead screw slide rail is used to push the fixing piece at the feeding end forward along the chute to the discharging end. The third manipulator (1001) is also used to clamp and pick up the urea pump assembly with the SP pump installed at the SP pump installation station (10) using the pump body clamping claws and place it on the first pump body flipping mechanism (1105) of the pipe joint and fixing plate installation station (11). The fourth manipulator (1101) is used to simultaneously pick up a set of three pipe joints on the pipe joint feeding mechanism (1102) using the pipe joint clamping claws and lift them before the third manipulator (1001) places the urea pump assembly, and rotate the clamping end to replace it with the fixing plate clamping claws. The fourth manipulator (1101) is also used to pick up the fixing plate conveyed by the fixing plate feeding mechanism (1103) using the fixing plate clamping claws after picking up the pipe joints and lift them, and rotate the clamping end to replace it with the pipe joint clamping claws. The first pump body flipping mechanism (1105) is used to clamp and fix the urea pump assembly; the first pump body flipping mechanism (1105) is also used to drive the urea pump assembly to flip from the horizontal state to the vertical state after clamping and fixing the urea pump assembly. The fourth manipulator (1101) is used to install the three pipe joints at the corresponding positions on the urea pump assembly simultaneously after detecting that the flipping of the urea pump assembly is completed. The fourth manipulator (1101) is also used to lift and rotate the clamping end to replace it with the fixing plate clamping claws after installing the pipe joints and install the fixing plate on the outer side of the pipe joints of the urea pump assembly. After the sensor at the discharge end of the fixing plate feeding mechanism (1103) detects that the fixing plate is picked up, the first lead screw guide drives the push block to reset, and pushes the next fixing plate to move to the discharge end again, repeating the process of picking up and installing the fixing plate. The third locking machine (1104) is used to lock the fixing plate and the urea pump assembly with bolts to uniformly fix the three pipe joints. After the third locking machine (1104) locks the fixing plate, the first pump body flipping mechanism (1105) flips the urea pump assembly from the vertical state to the horizontal state and releases the fixation of the urea pump assembly.

5. The production line applicable to urea pump assembly according to claim 1, characterized in that, The filter element rubber rod and filter element cover installation station (12) includes a fifth manipulator (1201), a sixth manipulator (1202), a filter element rubber rod feeding mechanism (1203), a filter element cover feeding mechanism (1204), a cap screwing device (1205), and a second pump body flipping mechanism (1206). The fifth manipulator (1201) is provided with pump body clamping claws and filter element rubber rod clamping claws, and the sixth manipulator (1202) is only provided with pump body clamping claws. The filter element cover feeding mechanism (1204) includes a frame, a plurality of material racks, a pushing cylinder, a belt conveyor, an intercepting cylinder, a clamping and positioning cylinder, a cover plate, and a limiting rod. The cap screwing device (1205) includes a cap screwing motor, a pressing and resetting cylinder, a cap screwing fixture, a cylinder support frame, a connecting plate, a precision reducer, a stabilizing plate, and a first buffer. The fifth manipulator (1201) is used to first clamp and lift the filter element rubber rod conveyed by the filter element rubber rod feeding mechanism (1203) with the filter element rubber rod clamping jaw, and rotate the clamping end to replace it with the pump body clamping jaw. The fifth manipulator (1201) is also used to clamp and place the urea pump assembly with the pipe joint and fixing piece installed on the pipe joint and fixing piece installation station (11) with the pump body clamping jaw, and lift it to rotate the clamping end to replace it with the filter element rubber rod clamping jaw. The second pump body flipping mechanism (1206) is used to fix and lock the urea pump assembly after detecting the urea pump assembly and flip the urea pump assembly from a horizontal state to a vertical state. The fifth manipulator (1201) is used to place the filter element rubber rod on the urea pump assembly after detecting that the urea pump assembly is flipped to a vertical state. The pushing cylinder is used to push the filter element cover to the through hole and drop it onto the belt conveyor after the sensor detects the filter element cover. Sensors for detecting whether there is a filter element cover at the feeding end of the intercepting cylinder and for detecting whether the filter element cover passes through the discharging end of the intercepting cylinder are respectively arranged at the feeding end and the discharging end of the intercepting cylinder. The intercepting cylinder is used to extend to intercept the subsequent filter element covers after both sensors detect the filter element cover, allowing only one filter element cover to pass through each time. A sensor for detecting whether the filter element cover reaches the clamping position is arranged at the clamping and positioning cylinder. The clamping and positioning cylinder is used to extend to clamp and position the filter element cover to the clamping position after the sensor detects the filter element cover. The electric slide rail is used to drive the capping device (1205) to move to the filter element cover clamping position after the clamping and positioning cylinder clamps the filter element cover. The pressing and resetting cylinder is used to extend downward to push the connecting plate to move a specified distance after moving to the filter element cover clamping position. The connecting plate is used to drive the capping fixture to move a specified distance and press it into the filter element cover. The pressing and resetting cylinder is used to contract upward to pull the connecting plate back to drive the capping fixture to clamp the filter element cover after the capping fixture presses into the filter element cover. The electric slide rail is used to drive the capping device (1205) to move to the specified filter element cover installation position after the connecting plate is reset. The pressing and resetting cylinder is used to extend downward to drive the capping fixture to move downward to the specified position after reaching the specified filter element cover installation position. The capping motor is used to drive the capping fixture to rotate to screw the filter element cover into the urea pump assembly while the capping fixture moves downward. The pressing and resetting cylinder is used to contract upward to drive the capping fixture to move out of the filter element cover and reset after the filter element cover is screwed into the urea pump assembly. The second pump body flipping mechanism (1206) is used to flip the urea pump assembly back to the horizontal state and release the fixation of the urea pump assembly after detecting that the filter element cover is screwed into the urea pump assembly. The sixth manipulator (1202) is used to clamp and place the urea pump assembly with the filter element rubber rod and the filter element cover installed on the lifting and positioning mechanism (14) with the pump body clamping jaw.

6. The production line applicable to urea pump assembly according to claim 1, characterized in that The manual assembly line, the double-layer double-speed chain conveyor line (13), and the lifting and positioning mechanism (14) are all provided with lifting and clamping cylinders (27) for clamping and positioning the tooling plate (26). There is a lifting and clamping cylinder (27) at each station on the double-layer double-speed chain conveyor line (13). When the urea pump sensor at the corresponding station detects that the urea pump assembly is installed on the tooling plate (26), the lifting and clamping cylinder (27) at the corresponding station will quickly rise to clamp and fix the tooling plate (26). When the urea pump sensor does not detect that the urea pump assembly is installed on the tooling plate (26), the lifting and clamping cylinder (27) will not rise.

7. The production line applicable to urea pump assembly according to the claim is characterized in that, The lifting and positioning mechanism (14) includes a first profile frame (1401), a roller conveyor line (1402), a roller motor (1403), and a positioning pin (1404). The roller conveyor line (1402) is horizontally arranged on the first profile frame (1401). A roller motor (1403) and a positioning pin (1404) are respectively arranged below the roller conveyor line (1402). The roller motor (1403) is used to drive the roller conveyor line (1402) to rotate in the same direction as the first elevator (15) to convey the tooling plate (26) onto the roller conveyor line (1402) after the tooling plate sensor does not detect the tooling plate (26). The positioning pin (1404) is used to lift and position the tooling plate (26) by passing through between multiple inserts (2601) after the tooling plate sensor detects the tooling plate (26). The positioning pin (1404) is used to lower and release the positioning after the urea pump sensor detects that the urea pump assembly is placed on the tooling plate (26). The roller motor (1403) is used to drive the roller conveyor line (1402) to convey the tooling plate (26) onto the first elevator (15) after the positioning pin (1404) descends. The first elevator (15) includes a second profile frame (1501), a belt conveyor mechanism (1502), a drive motor (1503), and a lifting cylinder (1504). The lifting cylinder (1504) is used to drive the belt conveyor mechanism (1502) to descend to be flush with the lower conveyor line when the tooling plate sensor of the lifting and positioning mechanism (14) does not detect the tooling plate (26). The drive motor (1503) is used to drive the belt conveyor mechanism (1502) to rotate in the same direction as the lower conveyor line to move the tooling plate (26) onto the belt conveyor mechanism (1502). The lifting cylinder (1504) is used to drive the belt conveyor mechanism (1502) to rise and reset. The drive motor (1503) is used to drive the belt conveyor mechanism (1502) to convey the tooling plate (26) to the lifting and positioning mechanism (14) after the belt conveyor mechanism (1502) resets. The drive motor (1503) is used to drive the belt conveyor mechanism (1502) to rotate in the same direction as the upper conveyor line to convey the tooling plate (26) to the upper conveyor line after the urea pump assembly is placed on the tooling plate (26) on the lifting and positioning mechanism (14). The second elevator (24) has the same structure and operating principle as the first elevator (15).

8. The production line applicable to urea pump assembly according to claim 1, characterized in that, The first airtightness detection station (16) and the second airtightness detection station (21) both include an airtightness detection equipment body and an airtightness detection table (28). The airtightness detection table (28) includes a pressing and fixing cylinder (2801), a sealing component (2802), a pushing cylinder (2803), and a mounting bracket (2804). An mounting bracket (2804) is provided on the airtightness detection table (28), a pushing cylinder (2803) is mounted on the mounting bracket (2804), a sealing component (2802) is provided at the telescopic end of the pushing cylinder (2803), and two pressing and fixing cylinders (2801) located on the left and right sides of the sealing component (2802) are provided on the mounting bracket (2804). The sealing component (2802) of the first airtightness detection station (16) is three sealing joints corresponding to three pipe joints, and the sealing component (2802) of the second airtightness detection station (21) is a single sealing joint corresponding to a waterproof breathable hole. An airtightness detection table (28) is provided on the airtightness detection body. When the tooling plate (26) with the urea pump assembly is transported to the airtightness detection station, the lifting and clamping cylinder (27) rises to fix the tooling plate (26). The pressing and fixing cylinder (2801) is used to descend and press and fix the urea pump assembly after the tooling plate (26) is fixed. The pushing cylinder (2803) is used to push the sealing component (2802) to dock and seal with the three pipe joints or the waterproof breathable hole on the urea pump assembly after the urea pump assembly is fixed. The airtightness detection equipment body is used to inflate the inner side of the urea pump assembly through the sealing component (2802) at the sealing interface of the sealing component (2802) to detect the airtightness of the urea pump assembly. During inflation, pressure is maintained for a certain period of time, and the attenuation of the gas pressure in the pump is read. If the attenuation exceeds the specified value, it is defective; otherwise, it is qualified.

9. The production line applicable to urea pump assembly according to claim 1, wherein The first defective product rejection mechanism (17) includes a pushing cylinder, an electromagnetic fixture, and a defective product storage cabinet. The defective product storage cabinet is located on one side of the upper conveyor line. Both the pushing cylinder and the electromagnetic fixture are located inside the defective product storage cabinet. When the urea pump sensor of the first defective product rejection mechanism (17) detects a defective urea pump assembly, the lifting and clamping cylinder (27) at the first defective product rejection mechanism (17) is used to rise and clamp and fix the tooling plate (26). The pushing cylinder is used to push the electromagnetic fixture towards the fixed tooling plate (26). The electromagnetic fixture is used to adsorb and clamp the magnetic iron block (2605) on the tooling plate (26). The lifting and clamping cylinder (27) is used to descend and reset to release the clamping and fixing of the tooling plate (26) after the electromagnetic fixture adsorbs and clamps the tooling plate (26). The pushing cylinder is used to pull the electromagnetic fixture to reset after the lifting and clamping cylinder (27) descends and resets. The reset of the electromagnetic fixture drives the tooling plate (26) and the defective urea pump assembly to move inside the defective product storage cabinet and alarm. The second defective product rejection mechanism (22) has the same structure and operating principle as the first defective product rejection mechanism (17).

10. The production line applicable to urea pump assembly according to claim 1, characterized in that, The wire harness arranging station (18), the upper cover locking station (19), the lower cover locking station (20) and the waterproof breathable cap assembling station (23) are all semi-automatic stations. The upper cover locking station (19) is provided with a fourth locking machine for installing the upper cover. The lower cover locking station (20) is provided with a fifth locking machine and a first flipping mechanism. The first flipping mechanism is used to flip the urea pump assembly installed with the upper cover by a certain degree and place it on the reverse fixing position of the tooling plate (26). The fifth locking machine is used to install the lower cover on the flipped urea pump assembly. The waterproof breathable cap assembling station (23) is provided with a second flipping mechanism and a waterproof breathable cap installing mechanism. The second flipping mechanism is used to flip the urea pump assembly installed with the lower cover again by a certain degree and place it on the forward fixing position of the tooling plate (26). The waterproof breathable cap installing mechanism is used to install the waterproof breathable cap on the flipped urea pump assembly. The wire harness arranging station (18), the upper cover locking station (19), the lower cover locking station (20) and the waterproof breathable cap assembling station (23) are all provided with reset buttons. After the reset buttons are triggered, they are used to lower and reset the lifting and clamping cylinders (27) of the corresponding stations to release the tooling plate (26) and convey it to the next station.

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