A rotary multi-station gas spring comprehensive detection device

Abstract

The application discloses a rotary multi-station gas spring comprehensive detection device, which comprises a base and a rotary material table arranged on the base, and further comprises a feeding station, an acceleration detection station, a first screening station, a force value detection station, a second screening station, a vibration detection station and a discharging station which are arranged on the base and surround the rotary material table. The rotary multi-station gas spring comprehensive detection device can perform multiple detections on the gas spring, the stations on the comprehensive detection device are arranged in a ring shape, a large amount of work space of a factory is saved, and the problems of long gas spring detection time and high labor cost in detection can be solved.

Description

Technical Field

[0001] This invention relates to the field of gas spring testing technology, and more specifically, to a rotary multi-station gas spring integrated testing device. Background Technology

[0002] Gas springs are mechanical parts that can provide support, cushioning, braking, height and angle adjustment, and are widely used in industries such as medical, automobile manufacturing and furniture production. In the current technology, the testing of gas springs is mainly carried out by measuring each item using traditional instruments, which results in long testing time and high manual testing costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a rotary multi-station gas spring integrated testing device. The circular arrangement of the stations significantly saves factory workspace and allows for one-time testing of gas springs, solving the technical problems of long testing time and high labor costs.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: including a base and a rotary material platform disposed on the base, and further including a loading station, an acceleration detection station, a first screening station, a force detection station, a second screening station, a vibration detection station and a unloading station disposed on the base and surrounding the rotary material platform;

[0005] The rotary table has a horizontally positioned support platform and a horizontally rotating step-by-step rotary table located above the support platform. Several main gripper assemblies are arranged in a ring on the rotary table, each with two grippers for holding the housings of the gas springs to be tested. Several support base assemblies are provided on the support platform. When the rotary table is stationary, one main gripper assembly and one support base assembly directly below it constitute a fixing mechanism for holding two gas springs. The loading station is used to place two gas springs to be tested vertically onto a fixing mechanism on the rotary table directly opposite the loading station. An acceleration detection station is located in the rotation direction of the rotary table and behind the loading station, used to perform acceleration detection on the gas springs that move to the fixing mechanism at this station. A first screening station is located in the rotation direction of the rotary table and behind the acceleration detection station. Behind the measuring station, a gas spring that fails the acceleration test after being moved to the station's fixed mechanism is removed; the force value test station is located in the rotation direction of the rotary table and behind the first screening station, and is used to test the force value of the gas springs on the station's fixed mechanism; the second screening station is located in the rotation direction of the rotary table and behind the force value test station, and is used to remove the gas springs that fail the force value test after being moved to the station's fixed mechanism; the vibration test station is located in the rotation direction of the rotary table and behind the second screening station, and is used to test the vibration of the gas springs on the station's fixed mechanism; the unloading station is located in the rotation direction of the rotary table and behind the vibration test station, and is used to remove all the gas springs on the station's fixed mechanism and divert them. Preferably, the acceleration detection station includes a first pressure platform that is horizontally positioned and moves vertically. When the rotary table is stationary, the first pressure platform is located directly above the fixed mechanism at the acceleration detection station. The first pressure platform has a first through hole through which the top rod of the air supply spring passes. The first pressure platform also has a first movable sealing block located directly above the first through hole. The first pressure platform also has a detection block that can move vertically located above the first movable sealing block. The acceleration detection station also has an acceleration sensor located above the detection block.

[0006] Preferably, the force detection station includes a second pressure platform that is horizontally positioned and moves in the vertical direction. When the rotary table is stationary, the second pressure platform is located directly above the fixed mechanism at the force detection station. A pressure-bearing block is installed at the bottom of the second pressure platform, which abuts against the end of the top rod of the gas spring. The pressure-bearing block is equipped with a pressure sensor.

[0007] Preferably, the vibration testing station includes a third pressure platform that is horizontally positioned and moves vertically. When the rotary table is stationary, the third pressure platform is located directly above the fixed mechanism at the vibration testing station. The third pressure platform has a second through hole through which the top rod of the gas spring passes, and a second movable sealing block located directly above the second through hole. The vibration testing station also includes a pair of testing claws for clamping the housing of the gas spring at the station, and each testing claw is equipped with a vibration sensor.

[0008] Preferably, the first screening station and the second screening station have the same structure. Both the first screening station and the second screening station include a vertical moving platform that is set horizontally and moves in the vertical direction. A tangential moving platform that is set horizontally and moves in the tangential direction along the movement trajectory of the fixed mechanism is installed at the bottom of the vertical moving platform. A normal moving platform that is set horizontally and moves in the normal direction along the movement trajectory of the fixed mechanism is installed at the bottom of the tangential moving platform. A picking claw is installed at the front end of the normal moving platform.

[0009] Preferably, the first screening station and the second screening station also include a defective product collection device installed on the base.

[0010] Preferably, the defective product collection device includes a mounting plate, a collection cylinder, and a first cylinder. The bottom of the collection cylinder is hinged to the mounting plate, the first cylinder is located on the side of the collection cylinder, one end of the first cylinder is hinged to the mounting plate, and the other end of the first cylinder is hinged to the side of the collection cylinder.

[0011] Preferably, the base is equipped with a lifting drive mechanism for driving the support platform to move in the vertical direction.

[0012] Preferably, when the support platform is a fixed device, an auxiliary gripper group is provided for each support base group, and each auxiliary gripper group has two grippers for gripping the housing of the gas spring to be tested.

[0013] Preferably, when the support platform is a lifting device, an auxiliary gripper group is provided for each support base group, and each auxiliary gripper group has two grippers for gripping the housing of the gas spring to be tested.

[0014] Beneficial effects: The present invention uses a ring-shaped arrangement of workstations on a comprehensive testing device to test gas springs in one go, which solves the technical problem that gas spring testing in the prior art requires manual item-by-item testing, resulting in high manual testing costs and long testing time. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a top view of the structure of the present invention.

[0017] Figure 3 This is a schematic diagram illustrating the working principle of the present invention.

[0018] Figure 4 This is a schematic diagram of the acceleration detection station of the present invention.

[0019] Figure 5 This is a side view of the acceleration detection station of the present invention.

[0020] Figure 6 This is a cross-sectional structural diagram of the acceleration detection station of the present invention.

[0021] Figure 7 This is a three-dimensional structural diagram of the force value detection station of the present invention.

[0022] Figure 8 This is a side view of the force detection station of the present invention.

[0023] Figure 9 This is a three-dimensional structural diagram of the vibration detection station of the present invention.

[0024] Figure 10 This is a side view of the vibration detection station of the present invention.

[0025] Figure 11 This is a cross-sectional structural diagram of the vibration detection station of the present invention.

[0026] Figure 12 This is a three-dimensional structural diagram of the screening station of the present invention. Figure 1 .

[0027] Figure 13 This is a three-dimensional structural diagram of the screening station of the present invention. Figure 2 .

[0028] In the picture:

[0029] Integrated testing device B;

[0030] Base B-1;

[0031] Rotary table B-2; support table B-2a; support base assembly B-2a1; auxiliary gripper assembly B-2a2; rotary table B-2b; main gripper assembly B-2b1;

[0032] Material loading station B-3;

[0033] Acceleration detection station B-4; First pressure table B-4a; First perforation B-4a1; First movable sealing block B-4b; Detection block B-4c; Acceleration sensor B-4d;

[0034] First screening station B-5; Vertical moving platform B-5a; Tangential moving platform B-5b; Normal moving platform B-5c; Picking claw B-5d; Defective product collection device B-5e; Mounting plate B-5e1; Collection cylinder B-5e2; First cylinder B-5e3.

[0035] Force detection station B-6; Second pressure table B-6a; Pressure sensor B-6b; Pressure block B-6c;

[0036] Second screening station B-7;

[0037] Vibration testing station B-8; Third pressure table B-8a; Second perforation B-8a1; Second movable sealing block B-8b; Testing claw B-8c;

[0038] Material unloading station B-9;

[0039] Feeding equipment A;

[0040] Material transfer device C; first conveyor belt C1; second conveyor belt C2. Detailed Implementation

[0041] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0042] Combination Figure 1 , Figure 2 and Figure 3As shown, a rotary multi-station gas spring integrated testing device includes a base B-1 and a rotary material platform B-2 mounted on the base. It also includes a loading station B-3, an acceleration detection station B-4, a first screening station B-5, a force detection station B-6, a second screening station B-7, a vibration detection station B-8, and a unloading station B-9, all mounted on the base B-1 and surrounding the rotary material platform B-2. The rotary material platform B-2 has a horizontally positioned support platform B-2a and a horizontally positioned step-rotating rotary table B-2b located above the support platform B-2a. The rotary table B-2b... Several main gripper assemblies B-2b1 are arranged in a ring shape. Each main gripper assembly B-2b1 has two grippers for holding the housing of the gas spring to be tested. Several support base assemblies B-2a1 are provided on the support platform B-2a. When the rotary table B-2b is stationary, one main gripper assembly B-2b1 and one support base assembly B-2a1 located directly below it constitute a fixing mechanism for holding two gas springs. The loading station B-3 is used to place two gas springs to be tested vertically into a fixing mechanism on the rotary table B-2 directly opposite the loading station B-3. The acceleration detection station B-4 is arranged as follows: Located in the rotational direction of rotary table B-2b and behind loading station B-3, this station is used to perform acceleration detection on the gas springs on the fixed mechanism that move to this station; the first screening station B-5 is located in the rotational direction of rotary table B-2b and behind acceleration detection station B-4, and is used to remove gas springs that fail the acceleration detection test from the fixed mechanism that move to this station; the force value detection station B-6 is located in the rotational direction of rotary table B-2b and behind the first screening station B-5, and is used to perform force value detection on the gas springs on the fixed mechanism that move to this station; the second screening station... Station B-7 is located in the rotation direction of rotary table B-2b and behind force detection station B-6. It is used to remove gas springs that fail the force detection test at station B-6 from the fixed mechanism that moves to this station. Station B-8 is located in the rotation direction of rotary table B-2b and behind the second screening station B-7. It is used to perform vibration testing on the gas springs on the fixed mechanism that moves to this station. Station B-9 is located in the rotation direction of rotary table B-2b and behind vibration detection station B-8. It is used to remove all gas springs on the fixed mechanism that moves to this station and divert them.When the gas springs are conveyed along the arrow direction on the feeding device A, after passing through the feeding station B-3, two gas springs to be tested are placed vertically on the rotary table B-2 in a fixed mechanism directly opposite the feeding station B-3. The gas springs are then rotated to the acceleration detection station B-4 by the stepping rotary table B-2b for testing. After testing, the gas springs are rotated to the first screening station B-5 by the stepping rotary table B-2b to remove the unqualified products from the previous station. Qualified gas springs are rotated to the force value detection station B-6 by the stepping rotary table B-2b for testing. After testing, the gas springs are rotated to the force value detection station B-6 by the stepping rotary table B-2b. The rotating table B-2b rotates the gas springs to the second screening station B-7, removing the unqualified products from the previous station. Qualified gas springs are rotated to the vibration detection station B-8 via the stepping rotating table B-2b for testing. After testing, the gas springs are rotated to the unloading station B-9 via the stepping rotating table B-2b for diversion. Unqualified gas springs are diverted to the first conveyor belt C1, while qualified gas springs are placed horizontally on the second conveyor belt C2 to enter the next processing equipment. The circular arrangement of the stations on the integrated testing device B saves a significant amount of factory space, labor costs, and testing time.

[0043] Combination Figure 4 , Figure 5 and Figure 6 As shown, the acceleration detection station B-4 includes a first pressure platform B-4a that is horizontally positioned and moves vertically. When the rotary table B-2b is stationary, the first pressure platform B-4a is located directly above the fixed mechanism at the acceleration detection station B-4. The first pressure platform B-4a has a first through hole B-4a1 through which the top rod of the air supply spring passes. The first pressure platform B-4a has a first movable sealing block B-4b located directly above the first through hole B-4a1. The first pressure platform B-4a also has a detection block B-4c that can move vertically and is located above the first movable sealing block B-4b. The acceleration detection station B-4 also has an acceleration sensor B-4d located above the detection block B-4c. When the gas spring rotates to the acceleration detection station B-4, the first pressure plate B-4a moves downward, causing the end of the gas spring's push rod to abut against the first movable sealing block B-4b, causing the gas spring's push rod to retract into the housing. When the length of the push rod retracted into the housing reaches a preset value, such as... Figure 6The first movable sealing block B-4b has two parts, each controlled by two independent cylinders. When the two first movable sealing blocks B-4b move in opposite directions, the push rod of the gas spring quickly passes through the gap formed between the two first movable sealing blocks B-4b and quickly impacts the detection block B-4c, causing the detection block B-4c to move upward in the vertical direction. The acceleration of the upward movement of the detection block B-4c is detected by the acceleration sensor B-4d. By comparing the detected value with the preset value, it is determined whether the push rod ejection speed of the gas spring is qualified, thereby saving a lot of labor costs and testing time.

[0044] Combination Figure 7 ,and Figure 8 As shown, the force detection station B-6 includes a second pressure platform B-6a that is horizontally positioned and moves vertically. When the rotary table B-2b is stationary, the second pressure platform B-6a is located directly above the fixed mechanism at the force detection station B-6. A pressure block B-6c is installed at the bottom of the second pressure platform B-6a, abutting against the end of the gas spring's push rod. A pressure sensor B-6b is installed on this pressure block B-6c. When the gas spring rotates to the force detection station B-6, the second pressure platform B-6a moves downwards, causing the end of the gas spring's push rod to abut against the pressure block B-6c, retracting the push rod into its housing. When the length of the push rod retracted into the housing reaches a preset value, the pressure sensor B-6b detects the pressure value of the gas spring's push rod at a specified compression distance. By comparing this detected value with the preset value, it is determined whether the pressure value of the gas spring's push rod at the specified compression distance is qualified, thereby saving significant labor costs and testing time.

[0045] Combination Figure 9 , Figure 10 and Figure 11 As shown, vibration testing station B-8 includes a third pressure platform B-8a that is horizontally positioned and moves vertically. When the rotary table B-2b is stationary, the third pressure platform B-8a is located directly above the fixed mechanism at vibration testing station B-8. The third pressure platform B-8a has a second through hole B-8a1 through which the top rod of the gas spring passes, and a second movable sealing block B-8b located directly above the second through hole B-8a1. Vibration testing station B-8 also includes a pair of detection claws B-8c for clamping the housing of the gas spring at this station, and a vibration sensor is installed on each detection claw. When the gas spring rotates to vibration testing station B-8, the third pressure platform B-8a moves downward, causing the end of the top rod of the gas spring to abut against the second movable sealing block B-8b, causing the top rod of the gas spring to retract into the housing. When the length of the top rod retracted into the housing reaches a preset value, such as... Figure 10The second movable sealing block B-8b has two parts, each controlled by two independent cylinders. When the two second movable sealing blocks B-8b move back and forth, the push rod of the gas spring rebounds. Because the push rod of the gas spring will vibrate during the rebound, the vibration intensity value of the rebound of the push rod of the gas spring is detected by the vibration sensor installed on the detection claw B-8c on the gas spring housing. The detected value is compared with the preset value to determine whether the vibration intensity of the push rod of the gas spring is within the qualified range, thereby saving a lot of labor costs and detection time.

[0046] Combination Figure 12 and Figure 13 As shown, the first screening station B-5 and the second screening station B-7 have the same structure. Both the first screening station B-5 and the second screening station B-7 include a vertically moving platform B-5a that is horizontally positioned and moves in the vertical direction. A tangentially moving platform B-5b that is horizontally positioned and moves tangentially along the trajectory of the fixed mechanism is mounted at the bottom of the vertically moving platform B-5a. A normally moving platform B-5c that is horizontally positioned and moves normally along the trajectory of the fixed mechanism is mounted at the bottom of the tangentially moving platform B-5b. A picking claw B-5d is mounted at the front end of the normally moving platform. Combined with... Figure 12 and Figure 13 As shown, the first screening station B-5 and the second screening station B-7 also include a defective product collection device B-5e installed on the base B-1. When the gas spring rotates to the first screening station B-5 or the second screening station B-7, the defective gas spring is removed from the fixing mechanism on the rotary table B-2b by the picking claw B-5d and placed into the collection device, thereby saving a lot of labor costs and inspection time.

[0047] Combination Figure 12 and Figure 13 As shown, the defective product collection device B-5e includes a mounting plate B-5e1, a collection cylinder B-5e2, and a first cylinder B-5e3. The bottom of the collection cylinder B-5e2 is hinged to the mounting plate B-5e1. The first cylinder B-5e3 is located beside the collection cylinder B-5e2, with one end hinged to the mounting plate B-5e1 and the other end hinged to the side of the collection cylinder B-5e2. A gas spring is located inside the collection cylinder of the defective product collection device B-5e. The first cylinder B-5e3 can tilt the collection cylinder to facilitate periodic removal by personnel.

[0048] Combination Figure 1 and Figure 2As shown, a lifting drive mechanism for driving the support platform B-2a to move vertically is installed on the base B-1. This lifting drive mechanism on the base B-1 facilitates adjustment of the distance between the support platform B-2a and the rotary table B-2b to accommodate different types of gas springs fixed to the fixed mechanism, thus facilitating the testing of different gas spring models.

[0049] Combination Figure 1 and Figure 2 As shown, each support platform B-2a is equipped with an auxiliary gripper group B-2a2 corresponding to each support base group B-2a1. Each auxiliary gripper group B-2a2 has two grippers for holding the housing of the gas spring to be tested. The auxiliary gripper groups B-2a2 on the support platform B-2a can make the gas spring more stable in the vertical direction when it is pressed downward by the pressure table during testing. This makes the gas spring less likely to tilt, thus reducing the accuracy of the test value, improving the testing precision, and avoiding false judgments.

[0050] Combination Figure 1 and Figure 2 As shown, each support platform B-2a is equipped with an auxiliary gripper group B-2a2 corresponding to each support base group B-2a1. Each auxiliary gripper group B-2a2 has two grippers for holding the housing of the gas spring to be tested. The auxiliary gripper groups B-2a2 on the support platform B-2a can make the gas spring more stable in the vertical direction when it is pressed downward by the pressure table during testing. This makes the gas spring less likely to tilt, thus reducing the accuracy of the test value, improving the testing precision, and avoiding false judgments.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rotary multi-station gas spring integrated testing device, comprising a base (B-1) and a rotary material platform (B-2) disposed on the base, characterized in that, It also includes a loading station (B-3), an acceleration detection station (B-4), a first screening station (B-5), a force detection station (B-6), a second screening station (B-7), a vibration detection station (B-8), and a unloading station (B-9) that are set on the base (B-1) and surround the rotary table (B-2). The rotary table (B-2) has a horizontally positioned support platform (B-2a) and a horizontally positioned step-rotating rotary table (B-2b) located above the support platform (B-2a). Several main gripper assemblies (B-2b1) are arranged in a ring on the rotary table (B-2b). Each main gripper assembly (B-2b1) has two grippers for holding the housing of the gas spring to be tested. Several support base assemblies (B-2a1) are provided on the support platform (B-2a). When the rotary table (B-2b) is stationary, one... The main gripper assembly (B-2b1) and a support base assembly (B-2a1) located directly below it constitute a fixing mechanism for clamping two gas springs; the loading station (B-3) is used to place the two gas springs to be tested vertically into a fixing mechanism on the rotary table (B-2) directly opposite the loading station (B-3); the acceleration detection station (B-4) is arranged in the rotation direction of the rotary table (B-2b) and behind the loading station (B-3), and is used to perform acceleration detection on the gas springs that move to the fixing mechanism at this station; The first screening station (B-5) is located in the rotation direction of the rotary table (B-2b) and behind the acceleration detection station (B-4). It is used to remove gas springs that fail the acceleration detection test after moving to the fixed mechanism at this station. The force detection station (B-6) is located in the rotation direction of the rotary table (B-2b) and behind the first screening station (B-5). It is used to perform force detection on the gas springs on the fixed mechanism at this station. The second screening station (B-7) is located in the rotation direction of the rotary table (B-2b) and behind the force detection station. Behind (B-6), the gas springs that fail the force value detection at the fixed mechanism of the station (B-6) are removed; the vibration detection station (B-8) is located in the rotation direction of the rotary table (B-2b) and behind the second screening station (B-7), and is used to perform vibration detection on the gas springs on the fixed mechanism of the station; the unloading station (B-9) is located in the rotation direction of the rotary table (B-2b) and behind the vibration detection station (B-8), and is used to remove all the gas springs on the fixed mechanism of the station and divert them. The acceleration detection station (B-4) includes a first pressure table (B-4a) that is set horizontally and moves in the vertical direction. When the rotary table (B-2b) is stationary, the first pressure table (B-4a) is located directly above the fixed mechanism at the acceleration detection station (B-4). The first pressure plate (B-4a) has a first through hole (B-4a1) through which the top rod of the air supply spring passes. The first pressure plate (B-4a) has a first movable sealing block (B-4b) located directly above the first through hole (B-4a1). The first pressure plate (B-4a) also has a detection block (B-4c) located above the first movable sealing block (B-4b) that can move in the vertical direction. The acceleration detection station (B-4) also has an acceleration sensor (B-4d) located above the detection block (B-4c). The force detection station (B-6) includes a second pressure table (B-6a) that is set horizontally and moves in the vertical direction. When the rotary table (B-2b) is stationary, the second pressure table (B-6a) is located directly above the fixed mechanism at the force detection station (B-6). The bottom of the second pressure plate (B-6a) is equipped with a pressure block (B-6c) that abuts against the end of the top rod of the gas spring, and the pressure block (B-6c) is equipped with a pressure sensor (B-6b). The vibration testing station (B-8) includes a third pressure platform (B-8a) that is set horizontally and moves in the vertical direction. When the rotary table (B-2b) is stationary, the third pressure platform (B-8a) is located directly above the fixed mechanism at the vibration testing station (B-8). The third pressure plate (B-8a) has a second through hole (B-8a1) through which the top rod of the air supply spring passes, and the third pressure plate (B-8a) has a second movable sealing block (B-8b) located directly above the second through hole (B-8a1). The vibration testing station (B-8) also includes a pair of testing claws (B-8c) for holding the housing of the gas spring in the station, each of which is equipped with a vibration sensor.

2. The rotary multi-station gas spring integrated testing device according to claim 1, characterized in that, The first screening station (B-5) and the second screening station (B-7) have the same structure. Both the first screening station (B-5) and the second screening station (B-7) include a vertical moving platform (B-5a) that is set horizontally and moves in the vertical direction. A tangential moving platform (B-5b) that is horizontal and moves in the tangential direction along the movement trajectory of the fixed mechanism is installed at the bottom of the vertical moving platform (B-5a). A normal moving platform (B-5c) that is horizontal and moves in the normal direction along the movement trajectory of the fixed mechanism is installed at the bottom of the tangential moving platform (B-5b). A picking claw (B-5d) is installed at the front end of the normal moving platform.

3. The rotary multi-station gas spring integrated testing device according to claim 2, characterized in that, The first screening station (B-5) and the second screening station (B-7) also include a defective product collection device (B-5e) installed on the base (B-1).

4. The rotary multi-station gas spring integrated testing device according to claim 3, characterized in that, The non-conforming product collection device (B-5e) includes a mounting plate (B-5e1), a collection cylinder (B-5e2), and a first cylinder (B-5e3). The bottom of the collection cylinder (B-5e2) is hinged to the mounting plate (B-5e1). The first cylinder (B-5e3) is located on the side of the collection cylinder (B-5e2). One end of the first cylinder (B-5e3) is hinged to the mounting plate (B-5e1), and the other end of the first cylinder (B-5e3) is hinged to the side of the collection cylinder (B-5e2).

5. A rotary multi-station gas spring integrated testing device according to any one of claims 1-4, characterized in that, A lifting drive mechanism for driving the support platform (B-2a) to move in the vertical direction is installed on the base (B-1).

6. A rotary multi-station gas spring integrated testing device according to any one of claims 1-4, characterized in that, Each support platform (B-2a) is equipped with an auxiliary gripper group (B-2a2) for each support base group (B-2a1). Each auxiliary gripper group (B-2a2) has two grippers for holding the housing of the gas spring to be tested.

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