Bimetal spring piece automatic device and method

Abstract

The invention discloses an automatic device for double metal spring pieces. The automatic device comprises a workbench, a divider rotating disc, a metal sheet base feeding mechanism, a metal spring piece feeding mechanism, a feeding height detection device, a riveting assembly device, a discharging sorting mechanism and a discharging height detection device. The rotating shafts are sequentially and respectively arranged around the divider turntable; the assembling method comprises the steps that workpieces are conveyed to the assembling platform deck through the metal sheet base feeding mechanism and the metal spring piece feeding mechanism correspondingly, the assembling state of the workpieces is judged through the feeding height detection device, the workpieces on the assembling platform deck are riveted through the riveting assembling device, and the discharging sorting mechanism sorts certified products and inferior-quality products according to the detection result. And the blanking height detection device is used for detecting the station blanking completion state. Through cooperation of the divider rotating disc and multiple mechanisms, automatic feeding, detection, riveting and sorting of metal sheet bases and spring pieces are achieved, manual intervention is reduced, and production continuity and efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automated equipment, and relates to an automatic loading and unloading mechanism for spring pieces, specifically an automatic device and method for bimetallic spring pieces. Background Art

[0002] A bimetallic spring piece is a part made by overlapping and riveting two different metal sheets. When the bimetallic spring piece material is subjected to certain pressure and temperature, due to the different expansion coefficients of the two, the curvature of the metal sheet changes, causing the metal sheet to bend towards the passive layer side, thereby generating deformation. This characteristic enables the bimetallic sheet to play an important role in the fields of mechanical and electronic equipment and is widely used in various instrument measuring machines and control devices. For example, in switches, deformation, temperature, and pressure detection.

[0003] There are front and back sides for two spring pieces, and it is necessary to ensure the correct direction of the spring piece before installation. As Figure 1 shown is the part shape and assembly appearance diagram of a certain type of metal spring piece. First, the metal spring piece needs to be placed in two protruding cylinders on the metal sheet base (the round hole corresponds to the protrusion), and then the two are riveted together. The traditional spring piece assembly adopts a manual operation method, which requires the worker to cooperate with both hands, first assemble and match, and then rivet; usually, the parts of the bimetallic sheet are small, and manual feeding is difficult and the efficiency is not high. Especially during riveting, when the parts are not assembled or placed correctly, at best, the part riveting fails, and at worst, the riveting rod may injure the finger or the parts may fly and scatter, and there is also a certain risk factor. Moreover, under mass production adjustment, manual operation efficiency is low. The problems of poor repeatability and laborious operation in metal spring piece assembly will affect the stability and consistency of the bimetallic sheet, as well as the quality and reliability of the final product. Therefore, there is an urgent need to explore more efficient solutions. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention discloses an automatic device and method for bimetallic spring pieces to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: An automatic device for bimetallic spring pieces, comprising a workbench, a divider turntable, a metal sheet base feeding mechanism, a metal spring piece feeding mechanism, a feeding height detection device, a riveting and assembling device, a blanking and sorting mechanism, and a blanking height detection device; the metal sheet base feeding mechanism, the metal spring piece feeding mechanism, the feeding height detection device, the riveting and assembling device, the blanking and sorting mechanism, and the blanking height detection device are sequentially arranged around the divider turntable and installed on the surface of the workbench; A plurality of assembly carriers are provided on the divider turntable. A carrier is provided at the upper end of the assembly carrier, first springs are provided on both sides of the middle part, and a bottom support table is provided at the lower end. The divider turntable is driven by a servo motor provided at the lower end and detects the rotation-in-place signal through an inductive sensor, driving the assembly carrier to sequentially complete the feeding, riveting, and discharging processes. The metal sheet base feeding mechanism and the metal spring sheet feeding mechanism respectively convey workpieces to the assembly carrier, determine the assembly state of the workpieces through the feeding height detection device, the riveting and assembling device rivets the workpieces on the assembly carrier, the discharging and sorting mechanism sorts the genuine products and defective products according to the detection results, and the discharging height detection device is used to detect the discharging completion state of the station.

[0006] Preferably, the metal sheet base feeding mechanism includes a metal sheet base vibrating disk, a metal sheet base feeding slideway, an opposed photoelectric sensor, a lifting cylinder, and a jaw assembly. The metal sheet base vibrating disk queues up and feeds the metal sheet bases in sequence through the metal sheet base feeding slideway. The lifting cylinder is installed on the surface of the workbench. The lifting cylinder jacks up the feeding lifting frame provided at the front end of the metal sheet base feeding slideway according to the detection signal of the opposed photoelectric sensor. The feeding lifting frame is installed on the surface of the workbench. The jaw assembly is installed on the surface of the workbench through a first support frame provided at the lower end. The jaw assembly cooperates with an upper and lower feeding cylinder and a left and right cylinder provided thereon to drive a first jaw provided at the lower end to pick up the metal sheet base and place it on the assembly carrier.

[0007] Preferably, the metal spring sheet feeding mechanism includes a metal spring sheet vibrating disk, a metal spring sheet feeding slideway, an XYZ three-axis linkage cylinder, and a feeding stamping mechanism. The metal spring sheets are fed by the metal spring sheet vibrating disk installed on the surface of the workbench and are arranged in sequence in the metal spring sheet feeding slideway. The entire feeding stamping mechanism is installed on the XYZ three-axis linkage cylinder. Two conical protrusions are provided at the lower end of the feeding stamping mechanism, which are adapted to the round hole size of the metal spring sheet. A stripping block provided at the lower end of the feeding stamping mechanism is limited in a C-shaped groove through two guide rods and a second spring arranged inside, and is used to push the metal spring sheet out of the feeding stamping and separate it when discharging, and place and compact it in the metal sheet base.

[0008] Preferably, the riveting and assembling device includes a riveting hydraulic cylinder, a fine-tuning handwheel, a ball screw nut pair and a lifting mechanism; the riveting hydraulic cylinder is installed on the surface of the workbench through a riveting support frame, the fine-tuning handwheel is installed at the upper end of the riveting hydraulic cylinder, and the fine-tuning handwheel adjusts the height of the riveting head at the lower end through the ball screw nut pair. The lifting mechanism is installed on the surface of the workbench. During riveting, the lifting cylinder extends, driving the rollers to roll into the rolling slideway, pushing out the lifting block, and supporting and assisting the assembly carrier platform through the lifting block to prevent the turntable from being damaged. Under the action of the riveting hydraulic cylinder, the metal spring sheet and the metal sheet base are riveted together.

[0009] Preferably, the riveting head of the riveting and assembling device is provided with two riveting notches for pressing two protrusions in the metal base into umbrella-shaped riveting butts.

[0010] Preferably, the blanking and sorting mechanism includes a right-angle rotating rod, a blanking up-and-down cylinder, a second jaw, a blanking cylinder and a genuine product slideway. The right-angle rotating rod is vertically installed directly above the blanking position. The lower end of the right-angle rotating rod is pushed by a blanking cylinder to drive a gear rack on one side to rotate, and cooperates with the blanking up-and-down cylinder at the upper end to drive the second jaw to rotate 90°. The start-stop and speed of the belt on the genuine product slideway are controlled by a frequency converter to drive a three-phase asynchronous motor on one side, and then the workpieces are sequentially blanked through the second jaw.

[0011] Preferably, a defective product slideway is provided on one side of the genuine product slideway. A defective product sorting cylinder is provided at the upper end of the defective product slideway, and a defective product box is provided at the lower end of the defective product slideway for collecting defective workpieces.

[0012] Preferably, the loading height detection device and the unloading height detection device are used to detect the height of the workpiece. Whether the current height of the assembly carrier platform meets the requirements is determined by the unloading height inspection device. According to the detection results, the second jaw sorts the workpieces to the genuine product slideway or the defective product slideway. If the height does not meet the requirements, the actions of the current station are blocked or sorted as defective products, and then inspected by manual and reused.

[0013] The present invention also provides an assembly method for a bimetallic spring sheet automatic device, including the following steps: S1. Automatically sort and supply the metal sheet base and the metal spring sheet through a vibrating disk and a slideway; S2. Use the loading mechanism to transfer the workpiece to the assembly carrier platform of the divider turntable; determine the assembly state of the workpiece through the loading height detection device; S3. Press and rivet the workpiece through the riveting and assembling device; S4. Sort genuine products and defective products through the blanking and sorting mechanism; S5. After confirming that there is no material at the station through the unloading height detection device, perform cyclic operation, otherwise trigger an alarm and stop the machine.

[0014] Preferably, the riveting height is adaptively adjusted by a fine-tuning handwheel and a ball screw nut pair; the metal spring piece is picked up by the conical protrusion of the feeding poking mechanism and pushed out by the stripping block during discharging, and is fitted with the protrusion of the metal piece base to complete the assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, through the coordinated cooperation of the indexing plate turntable and multiple mechanisms, the automatic feeding, detection, riveting and sorting of the metal piece base and the spring piece are realized, reducing manual intervention and improving production continuity and efficiency.

[0016] 2. In the present invention, the functions of feeding height detection, safety shielding during the riveting process and discharging and sorting are integrated, the assembly state and the finished product quality are monitored in real time to ensure the qualified rate, and at the same time, the functions of fault alarm and shutdown protection are provided to ensure the reliable operation of the equipment.

[0017] 3. In the present invention, the feeding speed of the vibrating bowl feeder is intelligently adjusted by the frequency converter, and combined with the real-time feedback of the feeding state, the feeding rhythm is dynamically adjusted to ensure the continuous and stable supply of parts, effectively matching the production line beat and reducing the risk of material shortage or accumulation.

[0018] 4. In the present invention, based on the height detection result, the riveting action shielding mechanism is linked, and combined with the cooperative support of the lifting mechanism, the precise control of the riveting process is realized, avoiding ineffective processing and equipment damage. At the same time, through the secondary detection after discharging, the station is ensured to be emptied, preventing fault chain reaction, and improving the reliability of the system and the consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0020] In the drawings: Figure 1 is the external view of the O-ring assembly of the present invention; Figure 2 is the structural schematic diagram of the automatic assembly mechanical device of the metal spring piece of the present invention; Figure 3 is the structural schematic diagram of the indexing plate turntable and the assembly carrier of the present invention; Figure 4 is the structural schematic diagram of the feeding mechanism of the metal piece base of the present invention; Figure 5 is the structural schematic diagram of the feeding mechanism of the metal spring piece of the present invention; Figure 6 is the structural schematic diagram of the riveting assembly device mechanism of the present invention; Figure 7It is a schematic structural diagram of the blanking and sorting mechanism of the present invention; Figure 8 It is a hardware structure diagram of the automatic assembly control system of the metal spring sheet of the present invention; Figure 9 It is a schematic diagram of the serial communication wiring between the Delta frequency converter and the Delta PLC of the present invention; Figure 10 It is a schematic diagram of the main program of the automatic riveting and assembly of the present invention; Figure 11 It is a schematic structural diagram of the main program of the automatic riveting and assembly of the present invention; Figure 12 It is a schematic diagram of the subroutine for optimizing the speed of the vibration disk of the frequency converter of the present invention; Figure 13 It is a schematic diagram of the main operation interface of the control system of the present invention; Reference numerals in the figure: 1, workbench; 2, dividing turntable; 201, assembly carrier; 202, carrier; 203, first spring; 204, bottom support table; 205, servo motor; 206, inductive sensor; 3, metal sheet base feeding mechanism; 301, metal sheet base vibration disk; 302, metal sheet base feeding chute; 303, opposed photoelectric sensor; 304, lifting cylinder; 305, first support frame; 306, feeding up and down cylinder; 307, left and right cylinder; 308, first jaw; 309, feeding lifting frame; 4, metal spring sheet feeding mechanism; 401, metal spring sheet vibration disk; 402, metal spring sheet feeding chute; 403, XYZ three-axis linkage cylinder; 404, feeding punching mechanism; 405, conical protrusion; 406, stripping block; 407, guide rod; 408, second spring; 409, C-shaped groove; 5, feeding height detection device; 6, riveting and assembly device; 601, riveting hydraulic cylinder; 602, fine-tuning handwheel; 603, ball screw nut pair; 604, lifting cylinder; 605, riveting support frame; 606, riveting head; 607, lifting block; 608, rolling chute; 609, roller; 7, blanking and sorting mechanism; 701, right-angle rotating rod; 702, blanking up and down cylinder; 703, second jaw; 704, blanking cylinder; 705, genuine product chute; 706, gear rack; 707, three-phase asynchronous motor; 708, defective product chute; 709, defective product sorting cylinder; 710, defective product box; 8, blanking height detection device. Specific embodiments

[0021] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0022] Embodiment: As Figure 2As shown in the figure, a bimetallic spring piece automatic device includes a workbench 1, a divider turntable 2, a metal piece base feeding mechanism 3, a metal spring piece feeding mechanism 4, a feeding height detection device 5, a riveting and assembling device 6, a blanking and sorting mechanism 7, and a blanking height detection device 8; the metal piece base feeding mechanism 3, the metal spring piece feeding mechanism 4, the feeding height detection device 5, the riveting and assembling device 6, the blanking and sorting mechanism 7, and the blanking height detection device 8 are sequentially arranged around the divider turntable 2 and installed on the surface of the workbench 1; the metal piece base feeding mechanism 3 and the metal spring piece feeding mechanism 4 respectively convey workpieces to the assembly carrier 201, the feeding height detection device 5 determines the assembly state of the workpieces, the riveting and assembling device 6 rivets the workpieces on the assembly carrier 201, the blanking and sorting mechanism 7 sorts genuine products and defective products according to the detection results, and the blanking height detection device 8 is used to detect the completion state of blanking at the work station.

[0023] Among them, the designs of the divider turntable 2 and the assembly carrier 201 are as Figure 3 shown. There are multiple assembly carriers 201 on the divider turntable 2. A carrier 202 is provided at the upper end of the assembly carrier 201, first springs 203 are provided on both sides of the middle part, and a bottom support platform 204 is provided at the lower end; the divider turntable 2 is the core component for assembly and transfer. The assembly carriers 201 are evenly and interspersed in the turntable at intervals of 60°. The carrier 202 at the upper end of the assembly carrier 201 is the place for feeding and processing. The first springs 203 on both sides of the middle part and the bottom support platform 204 at the lower end play shock-absorbing and supporting roles respectively. The divider turntable 2 is driven by a servo motor 205 provided at the lower end and detects the rotation in-place signal through an inductive sensor 206, driving the assembly carrier 201 to sequentially complete the feeding, riveting, and blanking processes.

[0024] Among them, as Figure 4 shown, the metal piece base feeding mechanism 3 includes a metal piece base vibrating disk 301, a metal piece base feeding slideway 302, a transmissive photoelectric sensor 303, a lifting cylinder 304, and a jaw assembly; the metal piece base vibrating disk 301 queues up and feeds the metal piece bases in sequence through the metal piece base feeding slideway 302. The lifting cylinder 304 is installed on the surface of the workbench 1. The lifting cylinder 304 jacks up a feeding lifting frame 309 provided at the front end of the metal piece base feeding slideway 302 according to the detection signal of the transmissive photoelectric sensor 303. The feeding lifting frame 309 is installed on the surface of the workbench 1. The jaw assembly is installed on the surface of the workbench 1 through a first support frame 305 provided at the lower end. The jaw assembly cooperates with an upper and lower feeding cylinder 306 and a left and right cylinder 307 to drive a first jaw 308 provided at the lower end to clamp the metal piece base to the assembly carrier 201.

[0025] Specifically, the metal sheet base vibratory bowl feeder 301 feeds the metal sheet bases in sequence through the metal sheet base feeding chute 302. When the opposed photoelectric sensor 303 detects that there is material at the current feeding position, the lifting cylinder 304 extends to lift the parts in the feeding and lifting frame 309, and the first jaw 308 clamps the metal sheet in the feeding and lifting frame and places it in the assembly stage 201. The feeding and loading mechanisms cooperate with each other to realize the functions of automatic feeding, queuing, and loading of the metal sheet bases.

[0026] Among them, as Figure 5 shown, the metal spring sheet feeding mechanism 4 includes a metal spring sheet vibratory bowl feeder 401, a metal spring sheet feeding chute 402, an XYZ three-axis linkage cylinder 403, and a feeding and stamping mechanism 404; the metal spring sheets are fed by the metal spring sheet vibratory bowl feeder 401 installed on the surface of the workbench 1 and are arranged in sequence in the metal spring sheet feeding chute 402. The entire feeding and stamping mechanism 404 is installed on the XYZ three-axis linkage cylinder 403. Two conical protrusions 405 are provided at the lower end of the feeding and stamping mechanism 404, which are adapted to the circular hole size of the metal spring sheet. A stripping block 406 provided at the lower end of the feeding and stamping mechanism 404 is limited in the C-shaped groove 409 through two guide rods 407 and a second spring 408 arranged inside, and is used to push the metal spring sheet out of the feeding and stamping during discharging, place it, and compact it in the metal sheet base. The second spring 408 plays a role of shock absorption and buffering during material taking and discharging, and the stripping block 406 is restricted to move within the upper and lower ranges inside the C-shaped groove 409.

[0027] Specifically, when the feeding and stamping mechanism 404 takes materials downward, the conical protrusions 405 pierce into the two circular holes of the metal spring sheet; during discharging, since the two protrusions of the metal sheet base just come into contact and collide with the conical protrusions 405, at this time, the stripping block 406 moves downward to push the metal spring sheet out of the feeding and stamping and place it and compact it in the metal sheet base.

[0028] Among them, as Figure 6 shown, the riveting and assembling device 6 includes a riveting hydraulic cylinder 601, a fine-tuning handwheel 602, a ball screw nut pair 603, and a lifting mechanism; the riveting hydraulic cylinder 601 is installed on the surface of the workbench 1 through a provided riveting support frame 605, the fine-tuning handwheel 602 is installed at the upper end of the riveting hydraulic cylinder 601, and the fine-tuning handwheel 602 adjusts the height of the lower end riveting head 606 through the ball screw nut pair 603. The riveting head 606 of the riveting and assembling device 6 is provided with two riveting slots for pressing the two protrusions in the metal base into umbrella-shaped riveting stops, and the lifting mechanism is installed on the surface of the workbench 1.

[0029] Specifically, after the two assembled parts are loaded, the loading height detection device 5 is used to determine whether the loading is qualified or the parts are defective. If the loading height detection device 5 detects and feedbacks that the height of the parts at the current position does not meet the requirements, the action of the current assembly stage 201 will be automatically blocked during riveting, which serves as an important safety protection mechanism. When riveting, the lifting cylinder 604 extends, driving the roller 609 to roll into the rolling slideway 608, pushing out the lifting block 607, and supporting and assisting the assembly stage 201 through the lifting block 607 to prevent the turntable from being damaged. Under the action of the riveting hydraulic cylinder 601, the metal spring sheet and the metal sheet base are riveted together.

[0030] Among them, as Figure 7 shown, the blanking and sorting mechanism 7 includes a right-angle rotating rod 701, a blanking up-and-down cylinder 702, a second jaw 703, a blanking cylinder 704, and a genuine product slideway 705. The right-angle rotating rod 701 is vertically installed directly above the blanking position. The lower end of the right-angle rotating rod 701 is pushed by the blanking cylinder 704 provided on one side to drive the gear rack 706 provided on one side to rotate, and cooperates with the blanking up-and-down cylinder 702 at the upper end to drive the second jaw 703 provided to rotate 90°. The start-stop and speed of the belt on the genuine product slideway 705 are driven by a three-phase asynchronous motor 707 controlled by a frequency converter on one side, and then the workpieces are blanked in sequence through the second jaw 703. A defective product slideway 708 is provided on one side of the genuine product slideway 705. A defective product sorting cylinder 709 is provided at the upper end of the defective product slideway 708, and a defective product box 710 is provided at the lower end of the defective product slideway 708 for collecting defective workpieces.

[0031] Specifically, it is determined whether the height of the current assembly stage 201 meets the requirements through the blanking height inspection device, and the workpieces are sorted to the genuine product slideway 705 or the defective product slideway 708 through the second jaw 703 according to the detection results. Those that meet the requirements are blanked to the genuine product slideway 705; if the height does not meet the requirements, the action of the current station is blocked or sorted as defective products, collected in the defective product box 710, and then inspected manually for reuse.

[0032] The present invention also provides an assembly method for a bimetallic spring sheet automatic device, including the following steps: S1. Automatically sort and supply the metal sheet base and the metal spring sheet through a vibrating disk and a slideway; S2. Use the loading mechanism to transfer the workpiece to the assembly stage 201 of the divider turntable 2; determine the assembly state of the workpiece through the loading height detection device 5; S3. Press and rivet the workpiece through the riveting assembly device 6, and the riveting height is adaptively adjusted through the fine-tuning handwheel 602 and the ball screw nut pair 603; the metal spring sheet is picked up by the conical protrusion 405 of the loading stabbing mechanism 404, and is pushed out by the stripping block 406 when discharging, and is assembled after fitting with the protrusion of the metal sheet base. S4. Sort the genuine products and defective products through the blanking and sorting mechanism 7; S5. After confirming that there is no material at the station through the blanking height detection device 8, perform cyclic operation, otherwise trigger an alarm to stop the machine.

[0033] According to the control requirements of the automatic assembly of metal spring sheets, the hardware mechanism of the system is set up, such as Figure 8 As shown, it mainly includes the input of sensing detection signals, the signal acquisition and processing of the height detection device, the output control of the frequency converter, servo motor, cylinder and hydraulic pressure. In order to facilitate the on-site operation of the staff and the automated management of production data, the operator station and the administrator station are designed in layers.

[0034] This system selects the Delta DVP-EH3 series PLC as the main control, and its model is: DVP64EH00T3. It has 32DI / 32DO (NPN / 24V / DC0.3A) built-in on the body, the program capacity is 16K, the power supply range is 100~240VAC, supports 4-channel pulse input and output, the frequency can reach 200KHZ, and it also has an RS485 interface, supporting the MODBUS RTU communication protocol. This type of PLC can also be expanded with modules and communication interfaces, selected and connected according to user needs, and has strong engineering adaptability. The HMI selects the MCGSTPC1061TI touch screen.

[0035] In order to facilitate the online communication between the PLC, the upper computer and the touch screen, the DVP-FEN01 Ethernet network card expansion card is selected as the communication medium. This expansion card is installed on the upper part of the PLC, occupies less space and is easy to install. The communication expansion card based on the MODBUS TCP / IP Ethernet protocol provides fast and reliable network communication functions, greatly facilitating the ability of the PLC system to perform network communication and data exchange processing with other devices. The DVP-FEN01 expansion card also provides convenient communication tools and a friendly configuration interface, and users can easily configure parameters.

[0036] Both the metal sheet base and the metal spring sheet are automatically loaded by vibrating bowls. The design of the vibrating bowls is customized according to the characteristics of the part size, shape, center of gravity, etc. The controller of the vibrating bowls supports the standard MODBUS RTU protocol.

[0037] The servo selects the Delta B2 system device, and the resolution of its encoder is as high as 160000HZ. By setting the electronic gear ratio (P1-44, P1-45), different control requirements can be met.

[0038] The control device of the three-phase asynchronous motor for the belt on the blanking chute selects Delta: VFD002EL21A (200W) frequency converter (DVP-EL type), which has a small volume, fast heat dissipation, high-precision current detection and complete overload protection functions, can play a protective role accurately and quickly, and effectively ensures the continuity of operation. The frequency converter is built-in with an RJ11 (6-pin telephone line type crystal head) communication interface, supports the standard MODBUS RTU communication protocol, takes the PLC of this system as the master station, and two vibratory bowls and the frequency converter as three slave stations, and is connected in parallel for communication. As Figure 9 Shown is the serial communication wiring diagram of the Delta DVP-EL series frequency converter and the Delta DVP-EH3 series PLC.

[0039] There are five parameters that must be set completely in the frequency converter parameter settings, including: P00 = 03 indicates that the frequency input signal source comes from the RS485 port; P01 = 04 indicates that the operation instruction is controlled by communication input, and the keyboard STOP key is valid; P88 = 3 indicates that the station address of the frequency converter is set to 3; the communication baud rate P89 = 01 indicates that the communication transmission speed is 9600 bit / s; the communication data format P92 = 04, that is, the Modbus RTU communication parameter format is <8.E.1>, indicating that the data length is eight bits, even parity, and one stop bit.

[0040] The communication between the PLC and the frequency converter is achieved through the relevant function addresses defined inside the frequency converter. Data is written and read based on these addresses to achieve the control of the frequency converter and obtain the feedback information of the frequency converter operation. The communication parameter address 2000H of the Delta PLC in the communication programming with the frequency converter is the start / stop control address, and 2001H is the frequency setting value address. It should be particularly noted that the hexadecimal number needs to be converted to decimal (for example: the Modbus address of 2000H is 8192).

[0041] Make the communication protocol of the PLC consistent with the frequency converter settings, and use the special communication MODRW instruction to achieve the communication control of the PLC to the frequency converter. The instruction is: MODRW S1 S2 S3 Sn. S1 is the address of the online device, which is the setting value of parameter P88 when communicating with the frequency converter. S2 is the communication function code. This instruction supports three function codes, namely H03 (read multiple commands), H06 (single data write command), and H10 (multiple data write command). S3 is the address of the communication slave device to be read and written, and n is the length of the data to be read and written.

[0042] Among them, the height detection device selects a high-performance laser coaxial displacement ranging sensor CL-P030 produced by KEYENCE Corporation. The measurement accuracy reaches ±1 mm, and the repeatability accuracy is within the range of ±2 mm, enabling high-precision height measurement. This sensor is used in conjunction with the CL-3000 controller, which can directly connect two height detection units, supports Ethernet communication with an Ethernet interface, configures input and output communication parameters through the dedicated CL-Navigator software, and outputs the height measurement data for display on the host computer.

[0043] The CL-P030 laser sensor has a dedicated trigger mode to control its ranging rhythm through an external signal trigger. This sensor is equipped with a communication interface and can quickly connect and communicate with PLCs and PCs. Using the CL-P030 to detect the height value can measure whether there is a lack of materials at the current station or whether the part feeding is offset. These situations are not suitable for further riveting and are directly determined as defective products, and the parts are taken back for recycling.

[0044] According to the riveting and assembly tasks of the bimetallic spring and the motion requirements of each mechanism, the main program of its control system is set in the present invention, as Figure 10 shown, mainly including the control programs for the feeding of the metal sheet base and the metal spring sheet, the detection of the feeding and discharging states of the parts, the execution of the riveting action, the discharging and sorting, and the dividing head turntable 2.

[0045] Initialization and reset are the preconditions for automatic operation and the basis for safe operation, mainly including the initialization of control parameters, the matching of operation parameters, the reset of each mechanism (to prevent damage to the mechanism), and the process of the turntable returning to the origin for reset. Only after the initialization is completed can the automatic operation state be entered.

[0046] The feeding of the metal sheet base and the metal spring sheet is realized by using a vibrating bowl. The function of the vibrating bowl is to orderly orient and arrange the randomly placed parts through eccentric vibration. The parts gradually rise along a spiral track (whose size is designed according to the size and shape of the parts). After being screened layer by layer through the track, the posture of the parts in terms of direction and position is corrected or the unqualified parts are removed. Finally, the qualified parts enter the specified feeding position in a unified posture. When there is a shortage of materials at the upper position, the vibrating bowl will accelerate the feeding to ensure timely supply after the parts are taken away. After the metal sheet base feeding mechanism 3 places the metal sheet base on the work station of the turntable, the turntable rotates one grid to the metal spring sheet feeding position to complete the feeding of the metal sheet. Subsequently, the turntable rotates to the height detection device to detect the height value of the workpiece. If the height meets the requirements, the workpiece enters the riveting and assembly work station for processing, and then is taken away by the discharging mechanism and placed in the genuine product discharging belt to queue for discharging. However, if the height does not meet the requirements, the current base will shield the riveting work and enter the defective product discharging area. After discharging is completed, the height will be detected again to ensure that there are no redundant parts on the processing work station and to avoid chain failures.

[0047] During the operation of riveting and assembly, each mechanism is independent of each other, connected in an orderly manner front and back, and operates periodically. The height detection device is triggered to execute when the turntable rotates into place. The height threshold can be set, and the height value is displayed and processed in the upper computer.

[0048] The riveting and assembly subroutine is a control process that uses a hydraulic cylinder and a riveting head 606 to flatten two protrusions on the metal sheet base and assemble the two together. As Figure 11 shown, before the riveting action is executed, it is necessary to judge whether the currently fed parts meet the requirements according to the data of the feeding height detection device 5. If they do not meet the requirements, the riveting action of the current work station will be shielded. When the height detection value is within the threshold range, the lifting cylinder 604 extends to lift the quick lift, holding the assembly work station, and the hydraulic cylinder extends downward for riveting. The riveting assembly time and riveting pressure of the hydraulic cylinder can be set according to the requirements of the metal material (usually copper) type. After the riveting and assembly is completed, the hydraulic cylinder first retracts to its in-place position, and then the lifting cylinder 604 retracts.

[0049] The design of the frequency converter vibrating bowl speed optimization subroutine is as Figure 12As shown, according to the feeding rhythm of parts on the assembly production line, set the starting and operating frequency F0 of the frequency converter (for example, 20HZ). Update the frequency according to the feedback information on whether there is material at the feeding position (opposite-type photoelectric sensor). Once the lack of material is detected, start timing (the timing time is T), and preset a time threshold constant T0 (for example, 3000ms). At this time, the operating frequency of the frequency converter is updated to F0 + 50 * T0 / T, that is, as the lack of material time goes by, the frequency converter continuously accelerates the feeding to make the parts feeding and conveying at the fastest response speed. When it is detected that there is material at the feeding position, keep running at the current speed. This speed control method automatically adjusts the output frequency of the frequency converter according to the processing rhythm, automatically searches for the optimal frequency, and realizes the precise control of the discharging state of the vibrating bowl feeder.

[0050] Furthermore, as Figure 13 shown, according to the riveting assembly operation and control requirements, set up the main control system operation interface, and the main interface includes the selection of the operation mode and the display of the processing data parameters of each mechanism.

[0051] Finally, it should be noted that the above are only the preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bimetallic spring sheet automatic device, characterized in that: It includes a workbench, a divider turntable, a metal sheet base feeding mechanism, a metal spring sheet feeding mechanism, a feeding height detection device, a riveting and assembling device, a discharging and sorting mechanism, and a discharging height detection device; the metal sheet base feeding mechanism, the metal spring sheet feeding mechanism, the feeding height detection device, the riveting and assembling device, the discharging and sorting mechanism, and the discharging height detection device are successively arranged around the divider turntable and installed on the surface of the workbench; A plurality of assembly carriers are provided on the divider turntable. A carrier is provided at the upper end of the assembly carrier, first springs are provided on both sides of the middle part, and a bottom support platform is provided at the lower end; the divider turntable is driven by a servo motor provided at the lower end and detects the rotation in-place signal through an inductive sensor, driving the assembly carrier to sequentially complete the feeding, riveting, and discharging processes; the metal sheet base feeding mechanism and the metal spring sheet feeding mechanism respectively convey workpieces to the assembly carrier, determine the assembly state of the workpieces through the feeding height detection device, the riveting and assembling device rivets the workpieces on the assembly carrier, the discharging and sorting mechanism sorts genuine products and defective products according to the detection results, and the discharging height detection device is used to detect the discharging completion state of the station.

2. The automatic bimetallic spring sheet device according to claim 1, characterized in that: The metal sheet base feeding mechanism includes a metal sheet base vibrating disk, a metal sheet base feeding chute, an opposed photoelectric sensor, a lifting cylinder, and a jaw assembly; the metal sheet base vibrating disk queues up and feeds the metal sheet bases in sequence through the metal sheet base feeding chute. The lifting cylinder is installed on the surface of the workbench. The lifting cylinder jacks up a feeding lifting frame arranged at the front end of the metal sheet base feeding chute according to the detection signal of the opposed photoelectric sensor. The feeding lifting frame is installed on the surface of the workbench. The jaw assembly is installed on the surface of the workbench through a first support frame provided at the lower end. The jaw assembly cooperates with an upper and lower feeding cylinder and a left and right cylinder provided thereon to drive a first jaw provided at the lower end to pick up the metal sheet base and place it on the assembly carrier.

3. The automatic device of a bimetallic spring strip according to claim 1, characterized in that: The metal spring sheet feeding mechanism includes a metal spring sheet vibrating disk, a metal spring sheet feeding chute, an XYZ three-axis linkage cylinder, and a feeding stabbing mechanism; the metal spring sheets are fed by the metal spring sheet vibrating disk installed on the surface of the workbench and are arranged in sequence in the metal spring sheet feeding chute. The entire feeding stabbing mechanism is installed on the XYZ three-axis linkage cylinder. Two conical protrusions are provided at the lower end of the feeding stabbing mechanism, which are adapted to the hole dimensions of the metal spring sheets. A stripping block provided at the lower end of the feeding stabbing mechanism is limited in a C-shaped groove through two guide rods and a second spring arranged inside, and is used to push the metal spring sheets out of the feeding stabbing mechanism and separate them during feeding, and place and compact them in the metal sheet base.

4. The automatic bimetallic spring piece device according to claim 1, characterized in that: The riveting and assembling device includes a riveting hydraulic cylinder, a fine-tuning handwheel, a ball screw nut pair and a lifting mechanism; the riveting hydraulic cylinder is installed on the surface of the workbench through a riveting support frame, the fine-tuning handwheel is installed at the upper end of the riveting hydraulic cylinder, and the fine-tuning handwheel adjusts the height of the riveting head at the lower end through the ball screw nut pair. The lifting mechanism is installed on the surface of the workbench. During riveting, the lifting cylinder extends, driving the rollers to roll into the rolling slideway, pushing out the lifting block, and supporting and assisting the assembly carrier platform through the lifting block. Under the action of the riveting hydraulic cylinder, the metal spring sheet and the metal sheet base are riveted together.

5. The automatic bimetallic spring sheet device according to claim 4, characterized in that: The riveting head of the riveting and assembling device is provided with two riveting notches for pressing two protrusions in the metal base into umbrella-shaped riveting blunt mouths.

6. The automatic bimetallic spring piece device according to claim 1, characterized in that: The blanking and sorting mechanism includes a right-angle rotating rod, a blanking up-and-down cylinder, a second jaw, a blanking cylinder and a genuine product slideway. The right-angle rotating rod is vertically installed directly above the blanking position. The lower end of the right-angle rotating rod is pushed by a blanking cylinder provided on one side to drive a gear rack provided on one side to rotate, and cooperates with the blanking up-and-down cylinder at the upper end to drive the second jaw to rotate 90°. The start-stop and speed of the belt on the genuine product slideway are controlled by a frequency converter to drive a three-phase asynchronous motor on one side, and then the workpieces are sequentially blanked through the second jaw.

7. The automatic bimetallic spring sheet device according to claim 6, characterized in that: A defective product slideway is provided on one side of the genuine product slideway. A defective product sorting cylinder is provided at the upper end of the defective product slideway, and a defective product box is provided at the lower end of the defective product slideway.

8. The automatic bimetallic spring piece device according to claim 7, characterized in that: The feeding height detection device and the blanking height detection device are used to detect the height of the workpiece. Whether the current height of the assembly carrier platform meets the requirements is determined through the blanking height inspection device, and the workpieces are sorted to the genuine product slideway or the defective product slideway according to the detection results by the second jaw.

9. An assembly method of a bimetallic spring piece automatic device, characterized in that, It includes the following steps: S1. Automatically sort and supply the metal sheet base and the metal spring sheet through the vibrating disk and the slideway; S2. Use the feeding mechanism to transfer the workpiece to the assembly carrier platform of the dividing head turntable; determine the assembly state of the workpiece through the feeding height detection device; S3. Press and rivet the workpiece through the riveting and assembling device; S4. Sort the genuine products and defective products through the blanking and sorting mechanism; S5. After confirming that there is no material at the station through the blanking height detection device, perform cyclic operation, otherwise trigger an alarm and stop the machine.

10. The assembly method of a bimetallic spring sheet automatic device according to claim 9, characterized in that: The riveting height is adaptively adjusted through the fine-tuning handwheel and the ball screw nut pair; the metal spring sheet is picked up by the conical protrusion of the feeding poking mechanism and is pushed out by the stripping block during discharging, and is assembled after fitting with the protrusion of the metal sheet base.

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