A hydraulic tensioner assembly line

Abstract

This invention discloses a hydraulic tensioner assembly line, a highly automated and integrated production system. The system mainly consists of a circular conveyor line, several assembly stations, a control cabinet, and a robotic arm. The circular conveyor line, as the core transportation equipment, is responsible for transporting workpieces between different assembly stations, ensuring the smooth operation of each process. Each assembly station is connected to the control cabinet, enabling precise control of the entire assembly process. This assembly line also features a dedicated workpiece pallet loading area for use by the corresponding stations. Furthermore, the tie rod assembly station is equipped with a stop pin drilling device for necessary drilling operations on the cylinder body. The pressure holding test station employs a dual-detection mode, equipped with sensors to monitor the displacement changes of the push rod in real time, ensuring accurate data recording. Overall, this assembly line achieves a one-stop automated production process from raw material supply to finished product output, significantly improving work efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the field of tensioner assembly technology, and more specifically to a hydraulic tensioner assembly line. Background Technology

[0002] A hydraulic tensioner is a device used to maintain appropriate tension in transmission systems such as belts, chains, or cables. It is widely used in industrial machinery, conveyor systems, and automotive engines to ensure the efficient and smooth operation of these systems. The main components of a hydraulic tensioner include: a hydraulic cylinder, tie rod, push rod, seals, springs, and supports, among other components.

[0003] Currently, hydraulic tensioners are mostly assembled manually, with each component of the hydraulic tensioner being assembled one by one. Since hydraulic tensioners have many components, a large number of assembly stations are required, with each station equipped with at least one assembly worker. This not only results in high labor costs but also low assembly efficiency and unsatisfactory assembly quality.

[0004] In view of the above, it is necessary to propose a hydraulic tensioner assembly line to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a hydraulic tensioner assembly line.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a hydraulic tensioner assembly line includes a circular conveyor line, several assembly stations arranged around the circular conveyor line, a control cabinet, and a robot arm; the circular conveyor line controls the transport of workpieces between the assembly stations, and each output end of the control cabinet is respectively connected to the corresponding end of the circular conveyor line, the corresponding end of the assembly station, and the corresponding end of the robot arm.

[0007] The assembly stations include the following stations arranged sequentially around the circular conveyor line: tie rod assembly station, top rod assembly station, pressure holding test station, limit sleeve assembly station, spring assembly station, support assembly station, final assembly station, and material unloading and stacking station.

[0008] The tie rod assembly station is used to push the tie rod workpiece into a predetermined position in the cylinder body; the push rod assembly station is used to invert the cylinder body, inject hydraulic oil from the other end, and press in the push rod workpiece.

[0009] The robotic arms include gantry robotic arms and palletizing robotic arms; the pressure holding test station, limit sleeve assembly station, spring assembly station, and support assembly station are all occupied by gantry robotic arms that grip the workpieces and move them back and forth between the station and the circular conveyor line; the final assembly station, unloading and palletizing station, and the circular conveyor line are occupied by palletizing robotic arms that grip the workpieces and move them to different positions.

[0010] Furthermore, a workpiece pallet loading area is provided between the tie rod assembly station and the push rod assembly station; the workpiece pallet loading area is provided with classified pallets for supplying materials to the tie rod assembly station and the push rod assembly station, the classified pallets including cylinder block pallets, tie rod pallets and push rod pallets.

[0011] Furthermore, the tie rod assembly station includes a cylinder cleaning fixture and an automatic tie rod pressing fixture. The cylinder cleaning fixture cleans at least one cylinder, and the cleaned cylinder is transferred to the automatic tie rod pressing fixture. The automatic tie rod pressing fixture is equipped with a cylinder positioning fixture and a top pressing cylinder. The free end of the top pressing cylinder coincides with the axis of the cylinder workpiece positioned by the cylinder positioning fixture. It also includes a stop pin drilling fixture, which performs drilling operations on the cylinder workpiece fixed by the cylinder positioning fixture through a drilling motor.

[0012] Furthermore, the push rod assembly station includes a quantitative oil injection station for injecting oil into the inside of the cylinder workpiece, wherein the push rod workpiece is positioned and screwed into the cylinder workpiece by a servo motor.

[0013] Furthermore, the workpiece is transferred from the circular conveyor line to the pressure holding test station by the gantry robot. The pressure holding test station is equipped with dual detection stations, each equipped with a servo electric cylinder. The servo electric cylinder applies test pressure to the push rod, and a sensor monitors the displacement change of the push rod in real time and generates data.

[0014] Furthermore, the limiting sleeve assembly station, spring assembly station, and support assembly station are all equipped with corresponding truss robots that grab the workpieces on the material tray and assemble them on the hydraulic tensioners on the circular conveyor line.

[0015] Furthermore, the final assembly station is moved into place by a palletizing robot gripping the product on the circular conveyor line. The final assembly station is equipped with two sets of pressing fixtures. The pressing fixtures are equipped with a lower pressure plate driven by a hydraulic press. The lower pressure plate compresses the spring on the tensioner product, causing the end of the pull rod to protrude. A servo motor for tightening nuts is also provided to tighten the nuts to the end of the pull rod.

[0016] Furthermore, after the nuts are installed, the palletizing robot grabs the tensioner product and transfers it to the unloading and palletizing station, where the stop plate and screws are assembled.

[0017] An assembly process for a hydraulic tensioner assembly line includes the following steps:

[0018] Step 1: Workpiece preparation and loading. Place the raw material pallets, such as cylinder block pallets, tie rod pallets, and push rod pallets, in the workpiece pallet loading area to provide the necessary components for subsequent assembly.

[0019] Step 2: Tie rod assembly. The cylinder body is first cleaned by the cleaning fixture, and then transferred to the automatic tie rod pressing fixture. Before the tie rod is pressed, the sealing ring is installed manually. The tie rod is pressed into the predetermined position in the cylinder body by the top pressing cylinder, and the cylinder body is drilled by the stop pin drilling machine.

[0020] Step 3: Push rod assembly. The cylinder body with the push rod cleaned and assembled is inverted, and a metered amount of hydraulic oil is injected into the other end of the cylinder body by an automatic oiling device. Then, the servo motor positions and screws the push rod into the cylinder body. This step also includes automatic marking and installation of the oil nozzle.

[0021] Step 4: Pressure Holding Test. After the top rod assembly is completed, the gantry robot moves the workpiece to the pressure holding test station. This step involves simultaneous testing at two stations. The servo electric cylinder applies test pressure to the top rod, and the displacement changes during pressure holding are monitored in real time and the data is recorded to ensure product quality.

[0022] Step 5: Limit sleeve assembly. The gantry robot grabs the limit sleeve from the material tray and accurately installs it onto the hydraulic tensioner on the circular conveyor line.

[0023] Step Six: Spring Assembly. Using a gantry robot, springs are picked up from the tray and assembled into the corresponding positions on the hydraulic tensioner.

[0024] Step 7: Support assembly. Continue to use the truss robot to grab the support from the material tray and install it onto the hydraulic tensioner;

[0025] Step 8: Final assembly. The palletizing robot grabs the semi-finished product from the circular conveyor line and moves it to the final assembly station. There are two sets of pressing fixtures at this station, which are used to compress the spring on the tensioner product to expose the end of the pull rod, and the servo motor tightens the nut on the end of the pull rod.

[0026] Step 9: Unloading and palletizing. After the final assembly is completed, the palletizing robot intervenes again to transfer the finished product to the unloading and palletizing station, where any remaining stop plates and screws are assembled.

[0027] The advantages and beneficial effects of this invention are as follows:

[0028] 1. The present invention introduces a hydraulic tensioner assembly line that incorporates gantry robots, palletizing robots, and various automated tooling, such as automatic tie rod pressing machines and servo motor screwing systems, which greatly reduces manual intervention, improves production efficiency and consistency, and reduces labor costs.

[0029] 2. By combining the cleaning fixtures in the tie rod assembly station, an integrated cleaning and lubrication workstation was created, which not only ensures the smooth operation of internal components, but also reduces frictional wear in subsequent processes and extends the product's service life.

[0030] 3. Establish a closed-loop system from data collected by sensors to the analysis platform and then to feedback to the production line. By analyzing a large amount of production data, identify the key factors affecting product quality and adjust the production process parameters in a timely manner to form a continuous improvement quality management mechanism. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a hydraulic tensioner assembly line according to the present invention;

[0032] Figure 2 This is a schematic diagram of the tie rod assembly station in this invention;

[0033] Figure 3 This is a schematic diagram of the top rod assembly station in this invention;

[0034] Figure 4 This is a schematic diagram of the pressure holding test station in this invention;

[0035] Figure 5 This is a structural schematic diagram of the final assembly station in this invention;

[0036] In the diagram: 1. Circular conveyor line; 2. Control cabinet; 3. Tie rod assembly station; 4. Top rod assembly station; 5. Pressure holding test station; 6. Limit sleeve assembly station; 7. Spring assembly station; 8. Support assembly station; 9. Final assembly station; 10. Unloading and palletizing station; 11. Truss robot; 12. Palletizing robot; 13. Workpiece pallet loading area; 14. Cylinder pallet; 15. Tie rod pallet; 16. Top rod pallet; 17. Cylinder cleaning fixture; 18. Automatic tie rod pressing fixture; 19. Cylinder positioning fixture; 20. Top pressure cylinder; 21. Stop pin drilling fixture; 22. Quantitative oil injection station; 23. Servo electric cylinder; 24. Pressing fixture; 25. Lower pressure plate; 26. Servo motor; 27. Vibrating feeder. Detailed Implementation

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0038] A hydraulic tensioner assembly line, such as Figure 1As shown, the assembly line includes a circular conveyor line 1 and several assembly stations arranged around it. The circular conveyor line 1 is elliptical in shape with parallel sides. It has an elliptical track with evenly spaced workpiece placement fixtures. When a workpiece is placed on a fixture, its position is fixed, making it upright. The placement fixtures facilitate the picking and placing of workpieces by a robotic arm. Each fixture is connected to a drive chain running within the track, allowing all fixtures to move simultaneously around the circular conveyor line 1, thus driving the workpiece movement between stations. The circular conveyor line 1 is preferably intermittent; when a fixture moves to a corresponding station, the conveyor line 1 stops, facilitating workpiece handling in conjunction with the robotic arm. The assembly line also includes a control cabinet 2 and a robotic arm. Specifically, each output terminal of the control cabinet 2 is connected to a corresponding terminal of the circular conveyor line 1, a corresponding terminal of the assembly station, and a corresponding terminal of the robotic arm.

[0039] like Figure 1 As shown, the assembly station includes the following stations arranged in sequence around the circular conveyor line 1: tie rod assembly station 3, top rod assembly station 4, pressure holding test station 5, limit sleeve assembly station 6, spring assembly station 7, support assembly station 8, final assembly station 9, and unloading and stacking station 10.

[0040] The tie rod assembly station 3 is used to push the tie rod workpiece into a predetermined position inside the cylinder; the push rod assembly station 4 is used to invert the cylinder and inject hydraulic oil from the other end to press in the push rod workpiece; and a workpiece pallet loading area 13 is provided between the tie rod assembly station 3 and the push rod assembly station 4; the workpiece pallet loading area 13 is provided with a classification pallet for supplying materials to the tie rod assembly station 3 and the push rod assembly station 4, the classification pallet including a cylinder pallet 14, a tie rod pallet 15, and a push rod pallet 16. There is a certain distance between the tie rod assembly station 3 and the push rod assembly station 4, and this workpiece forms the workpiece pallet loading area 13, such as... Figure 1 As shown, all the raw materials and workpieces that can be used in the initial assembly stations, namely tie rod assembly station 3 and top rod assembly station 4, are regularly placed in this area. KBK lifting devices are also set up in this area to facilitate the removal of various workpieces to the stations, or to suspend the workpieces assembled at tie rod assembly station 3 and top rod assembly station 4 onto the circular conveyor line 1.

[0041] The location of each workstation is as follows Figure 1As shown, a cylinder assembly station, a workpiece pallet loading area 13, and a push rod assembly station 4 are set on one straight edge of the circular conveyor line 1. On the other side of the circular conveyor line 1, a pressure holding test station 5, a limit sleeve assembly station 6, a spring assembly station 7, a support assembly station 8, and a final assembly station 9 are set in sequence. The robotic arms include a gantry robotic arm 11 and a palletizing robotic arm 12. The KBK lifting device is set in the workpiece pallet loading area 13 to allow the workpiece to be lifted and placed on either side of the workpiece or onto the circular conveyor line 1.

[0042] On the other straight side of the circular conveyor line 1, pressure holding test station 5, limit sleeve assembly station 6, spring assembly station 7, and support assembly station 8 are set up in sequence. The pressure holding test station 5, limit sleeve assembly station 6, spring assembly station 7, and support assembly station 8 are all occupied by gantry robots 11 that grab workpieces and move them back and forth between the station and the circular conveyor line 1. Each station is equipped with a gantry robot 11 to facilitate the movement and placement of workpieces on the circular conveyor line 1 or on the corresponding stations.

[0043] A palletizing robot 12 is installed at one end of the circular conveyor line 1, positioned between the final assembly station 9 and the unloading palletizing station 10. The palletizing robot 12 moves the workpiece between the final assembly station 9, the unloading palletizing station 10, and the circular conveyor line 1. During production, when the product assembled at the support assembly station 8 moves to the grasping range of the palletizing robot 12, the palletizing robot 12 picks up the product and moves it to the final assembly station 9 for assembly. After assembly, the palletizing robot 12 picks up the assembled product and places it on the pallet on the unloading palletizing station 10.

[0044] Specifically, the tie rod assembly station 3 also integrates a cylinder cleaning fixture 17, an automatic tie rod pressing fixture 2418, and a stop pin drilling fixture 21. The cylinder cleaning fixture 17 cleans at least one cylinder. The cylinder to be cleaned is placed inside the cylinder cleaning fixture 17, and after cleaning, it is directly transferred to the automatic tie rod pressing fixture 2418 on one side. Figure 2 As shown, the automatic pressing fixture 2418 for the pull rod includes a cylinder positioning fixture 19 and a top pressing cylinder 20. The free end of the top pressing cylinder 20 coincides with the axis of the cylinder workpiece positioned by the cylinder positioning fixture 19. After the cylinder is placed in the positioning fixture, the cylinders symmetrically arranged on both sides push towards the middle to clamp the cylinder, making the axis of the cylinder workpiece coincide with the axis of the upper top pressing cylinder 20. Then, the operator places the pull rod with the sealing ring installed into the cylinder, with the upper end of the pull rod aligned with the lower end of the top pressing cylinder 20. Then, the top pressing cylinder 20 presses down to contact the pull rod, thereby pressing the pull rod into the cylinder workpiece to a predetermined depth. It also includes a stop pin drilling fixture 21, such as... Figure 2As shown on the right, the stop pin drilling fixture 21 drills holes in the cylinder workpiece fixed by the cylinder positioning fixture 19 using a drilling motor. This fixture also features a vibrating feeder 27, which feeds the stop pin to the drilling position according to a predetermined posture, facilitating easy handling and installation by operators, thus effectively improving installation efficiency. After installation at this station is completed, the KBK lifting device lifts the assembled product onto the placement fixture on the circular conveyor line 1. The circular conveyor line 1 then continues to run, controlling the product to move to the next station. As the circular conveyor line 1 circulates, the empty placement fixture rotates to the pull rod assembly station 3, achieving the purpose of cyclical conveying.

[0045] Furthermore, the pushrod assembly station 4 includes a quantitative oil injection station 22 for injecting oil into the cylinder block workpiece, where the pushrod workpiece is positioned and screwed into the cylinder block workpiece by a servo motor 26. Figure 3 As shown, when the product with the cylinder installed moves to the push rod assembly station 4, the KBK lifting tool lifts the product out of the circular conveyor line 1 and sends it to the quantitative oil injection station 22 of the push rod assembly station 4. A certain amount of hydraulic oil is injected into the cylinder body, and then it is transferred to the cylinder body positioning fixture 19 in the push rod assembly station 4. It can be understood that the cylinder body positioning fixture 19 in this station has the same structure as described above. The cylinder body is clamped and positioned. Then, the upper part of the push rod assembly station 4 is equipped with a servo motor 26. The output end of the servo motor 26 is fixed with the push rod workpiece to be assembled. The servo motor 26 moves down and cooperates to control the rotation of the push rod workpiece to install the workpiece into the cylinder body, completing the assembly. In addition, this station also integrates an automatic marking process to mark the relevant parameters on the surface of the cylinder body. After completion, the KBK lifting tool puts it into the circular conveyor point and sends it to the next station for assembly.

[0046] The gantry robot 11 transfers the workpiece from the circular conveyor line 1 to the pressure holding test station 5, such as... Figure 4 As shown, the pressure holding test station 5 is equipped with dual testing stations. To coordinate with production capacity and cycle time, the two stations can simultaneously perform pressure holding tests, ensuring the testing efficiency of the hydraulic tensioner. Simultaneously, the pressure value and pressure holding displacement changes are monitored in real time, and the test data is stored. Figure 4 As shown, each testing station is equipped with a servo electric cylinder 23. The servo electric cylinder 23 applies test pressure to the push rod. The product is lifted by the corresponding gantry robot 11 onto the cylinder positioning fixture 19 for positioning. Then, the servo electric cylinder 23 presses down, applies a predetermined pressure to the push rod and holds it. During the process, the displacement change of the push rod is recorded. If the push rod is not compressed during the testing process, or the compression amount is within the product requirement range, it can be determined that the cylinder sealing is good and meets the product quality requirements. Otherwise, the product quality is unqualified. Unqualified products need to be inspected and reassembled.

[0047] The limiting sleeve assembly station 6, spring assembly station 7, and support assembly station 8 are all assembled by the corresponding gantry robot 11, which picks up the workpieces from the material tray and assembles them onto the hydraulic tensioner on the circular conveyor line 1. Figure 1 As shown, it can be understood that the assembly work completed at the limit sleeve assembly station 6, spring assembly station 7, and support assembly station 8 is all done by the corresponding gantry robot 11 picking up the workpieces from the workpiece trays and moving them to the top of the product on the circular conveyor line 1, and then fitting them in to complete the assembly. At the limit sleeve assembly station 6, the robot picks up the workpieces from the workpiece trays arranged in a regular pattern and then fits them onto the product to complete the assembly. Similarly, at the spring assembly station 7, the robot picks up the springs and places them on the product to complete the assembly. At the support assembly station 8, the corresponding robot picks up the support workpieces and places them on the top of the corresponding product. After the above assembly is completed, the product moves to the final assembly station 9 along the circular conveyor line 1.

[0048] The final assembly station 9 is equipped with two sets of pressing fixtures 24, such as: (The text abruptly ends here, so the translation stops as well.) Figure 5 As shown, this workstation is equipped with two sets of tooling to coordinate production capacity and improve assembly efficiency. The pressing tooling 24 is equipped with a lower pressing plate 25 driven by a hydraulic press. Each pressing station is equipped with two 150-ton hydraulic presses driving the lower pressing plate 25. When the lower pressing plate 25 moves downward, it compresses the spring on the tensioner product, causing the end of the pull rod to protrude. A servo motor 26 for tightening nuts tightens the nuts onto the end of the pull rod. Figure 5 As shown, a servo motor 26 is set between the two hydraulic presses. Nuts are fed in sequentially by the vibrating feeder 27 at the lower end of the servo motor 26. When the spring is compressed, the end of the pull cylinder is exposed. Then the servo motor 26 moves down and rotates in coordination to screw the nut onto the pull rod, thus completing the assembly.

[0049] Furthermore, after the nuts are installed, the palletizing robot 12 grabs the tensioner product and transfers it to the unloading and palletizing station 10, and completes the assembly of the stop plate and screws.

[0050] An assembly process for a hydraulic tensioner assembly line includes the following steps:

[0051] Step 1: Workpiece preparation and loading. Place the raw material pallets, such as cylinder block pallet 14, tie rod pallet 15, and push rod pallet 16, in the workpiece pallet loading area 13 to provide the necessary components for subsequent assembly.

[0052] Step 2: Tie rod assembly. The cylinder body is first cleaned by the cleaning fixture, and then transferred to the automatic tie rod pressing fixture 2418. Before pressing the tie rod, the sealing ring is installed manually. The tie rod is precisely pressed into the predetermined position in the cylinder body by the top pressing cylinder 20, and the cylinder body is drilled by the stop pin drilling machine.

[0053] Step 3: Push rod assembly. The cylinder body with the push rod cleaned and assembled is inverted. A metered amount of hydraulic oil is injected into the other end of the cylinder body by the automatic oiling device. Then, the servo motor 26 positions and screws the push rod into the cylinder body. This step also includes automatic marking and oil nozzle installation.

[0054] Step 4: Pressure Holding Test. After the top rod assembly is completed, the gantry robot 11 moves the workpiece to the pressure holding test station 5. In this step, the two stations are tested simultaneously. The servo electric cylinder 23 applies test pressure to the top rod, and the displacement change during pressure holding is monitored in real time and the data is recorded to ensure product quality.

[0055] Step 5: Assembly of the limiting sleeve. The gantry robot 11 picks up the limiting sleeve from the material tray and accurately installs it onto the hydraulic tensioner on the circular conveyor line 1.

[0056] Step 6: Spring assembly. Using the gantry robot 11, the spring is picked up from the tray and assembled into the corresponding position of the hydraulic tensioner.

[0057] Step 7: Support assembly. Continue to use the truss robot 11 to grab the support from the material tray and install it onto the hydraulic tensioner.

[0058] Step 8: Final assembly. The palletizing robot 12 picks up the semi-finished products on the circular conveyor line 1 and moves them to the final assembly station 9. At this station, there are two sets of pressing fixtures 24, which are used to compress the springs on the tensioner products so that the ends of the pull rods are exposed, and the servo motor 26 tightens the nuts on the ends of the pull rods.

[0059] Step 9: Unloading and palletizing. After the final assembly is completed, the palletizing robot 12 intervenes again to transfer the finished product to the unloading and palletizing station 10, and completes the assembly of any remaining stop plates and screws here.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic tensioner assembly line, characterized by, The assembly device comprises a ring-shaped conveying line, a plurality of assembly stations arranged around the ring-shaped conveying line, a control cabinet and a manipulator; the ring-shaped conveying line controls the conveying of workpieces between the assembly stations; each output end of the control cabinet is connected with a corresponding end of the ring-shaped conveying line, a corresponding end of the assembly station and a corresponding end of the manipulator, respectively; The assembly station comprises, in sequence around the ring-shaped conveying line, a pull rod assembly station, a jack rod assembly station, a pressure maintaining test station, a limiting sleeve assembly station, a spring assembly station, a support assembly station, a general assembly station and a blanking and stacking station; The pull rod assembly station is used for jacking a pull rod workpiece to a predetermined position in a cylinder body; the jack rod assembly station is used for pouring hydraulic oil into the cylinder body from the other end and pressing a jack rod workpiece into the cylinder body. The manipulator comprises a truss manipulator and a stacking manipulator; the pressure maintaining test station, the limiting sleeve assembly station, the spring assembly station and the support assembly station are moved between the stations and the ring-shaped conveying line by the truss manipulator; the general assembly station and the blanking and stacking station are moved between the ring-shaped conveying line by the stacking manipulator; The pull rod assembly station comprises a cylinder body cleaning tool and an automatic pull rod pressing tool; at least one cylinder body is cleaned by the cylinder body cleaning tool, and the cleaned cylinder body is transferred to the automatic pull rod pressing tool; the automatic pull rod pressing tool is provided with a cylinder body positioning tool and a pressing cylinder; the free end of the pressing cylinder coincides with the axis of the cylinder body workpiece positioned by the cylinder body positioning tool; the automatic pull rod pressing tool further comprises a stop pin punching tool which punches a hole in the cylinder body workpiece fixed by the cylinder body positioning tool by a punching motor; The jack rod assembly station comprises a quantitative oil pouring station for pouring oil into the cylinder body workpiece; the jack rod workpiece is positioned and screwed into the cylinder body workpiece by a servo motor; The workpiece is moved from the ring-shaped conveying line to the pressure maintaining test station by the truss manipulator; the pressure maintaining test station is provided with two detection stations; each detection station is provided with a servo cylinder; the servo cylinder applies a test pressure to the jack rod and a sensor monitors the displacement change of the jack rod in real time and forms data storage; The general assembly station moves the product on the ring-shaped conveying line to a position by the stacking manipulator; the general assembly station is provided with two sets of pressing tools; the pressing tool is provided with a lower pressing plate driven by a hydraulic press; the lower pressing plate compresses the spring on the tensioner product to expose the end of the pull rod; and a servo motor is provided for tightening the nut on the end of the pull rod.

2. A hydraulic tensioner assembly line according to claim 1, wherein, A workpiece tray feeding area is arranged between the pull rod assembly station and the jack rod assembly station; the workpiece tray feeding area is provided with classified trays for feeding the pull rod assembly station and the jack rod assembly station; the classified trays comprise a cylinder body tray, a pull rod tray and a jack rod tray.

3. A hydraulic tensioner assembly line according to claim 1, wherein, The limiting sleeve assembly station, the spring assembly station and the support assembly station are all provided with corresponding truss manipulators which grasp the workpieces on the trays and assemble the workpieces on the hydraulic tensioner on the ring-shaped conveying line.

4. The hydraulic tensioner assembly line of claim 1, wherein, After the nut is installed, the tensioner product is moved to the blanking and stacking station by the stacking manipulator, and the assembly of the stop plate and the screw is completed.

5. The assembly process of a hydraulic tensioner assembly line according to any one of claims 1-4, characterized in that, The method comprises the following steps: Step one: workpiece preparation and feeding; the cylinder body tray, the pull rod tray and the jack rod tray are placed in the workpiece tray feeding area to provide components for subsequent assembly. Step two: rod assembly, the cylinder is first cleaned by cleaning tooling, then transferred to the automatic rod press tooling, the seal ring is installed by hand before the rod press, the rod is accurately pressed into the cylinder by the top pressure cylinder, and the cylinder is drilled by the stop pin drilling machine; Step three: top rod assembly, the cylinder with assembled rod is inverted, the automatic oil injection device injects a certain amount of hydraulic oil into the other end of the cylinder, then the servo motor positions and screws the top rod into the cylinder, this step also includes automatic marking and oil nozzle installation; Step four: pressure test, after the top rod assembly is completed, the truss manipulator moves the workpiece to the pressure test station; this step is double-station simultaneous test, the servo cylinder applies test pressure to the top rod, the displacement change of pressure is monitored in real time, and the data is recorded to ensure product quality; Step five: limit sleeve assembly, the truss manipulator grabs the limit sleeve from the tray and accurately installs it on the hydraulic tensioner on the ring conveying line; Step six: spring assembly, the truss manipulator is used to grab the spring from the tray and assemble it to the corresponding position of the hydraulic tensioner; Step seven: support assembly, the truss manipulator is used to grab the support from the tray and install it on the hydraulic tensioner; Step eight: final assembly, the palletizing manipulator grabs the semi-finished product on the ring conveying line and moves it to the final assembly station, two sets of press tooling are provided at the station, which are used to compress the spring on the tensioner product to expose the end of the rod, and the servo motor is used to tighten the nut on the end of the rod; Step nine: unloading and stacking, after the final assembly is completed, the palletizing manipulator intervenes again to move the finished product to the unloading and stacking station, and the assembly of the stop plate and screw is completed at this station.

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