Lifter testing device

Abstract

The utility model discloses a testing device for a lifter, and when the testing device for the lifter is used for testing the durability of the lifter, a shell of the lifter is fixedly connected to a base. One end of the first adjusting rod is hinged to the base, and the other end of the first adjusting rod is hinged to the connecting frame. One end of the second adjusting rod is hinged to the base, and the other end of the second adjusting rod is hinged to the connecting frame. One end of the side connecting arm I is hinged to the connecting part A of the lifting arm I, and the other end of the side connecting arm I is hinged to the adjusting rod I; one end of a second side connecting arm is hinged to the connecting part A of the second lifting arm, and the other end of the second side connecting arm is hinged to the second adjusting rod; one end of the middle connecting arm is hinged to the shell, and the other end of the middle connecting arm is hinged to the connecting frame. The lifting devices are tested before batch production, the reliability of the lifting devices produced in batches in the follow-up using process can be guaranteed, the working efficiency of a user is improved, and the using cost of the user is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of test equipment, and in particular relates to a lifter test device. Background Art

[0002] In the field of agricultural machinery engineering, the casting lifter in agricultural machinery is an important component that connects the tractor with various agricultural implements. The casting lifter is usually composed of a shell and a lifting arm. They must have sufficient strength and durability to cope with uneven terrain, heavy loads and wear caused by long-term use.

[0003] At present, the lifters are not subjected to durability tests before mass production. The produced lifters are directly loaded on tractors for use. During use, lift arm breakage and other faults are prone to occur. The working reliability of the lifters is poor, which seriously affects the work efficiency of users. Replacing or repairing the lifters further increases the user's cost of use. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a lifter testing device, which can test the lifters before mass production, thereby ensuring the reliability of the mass-produced lifters in subsequent use, improving the user's work efficiency and reducing the user's use cost.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A lift test device, the lift to be tested using the lift test device comprises a shell and two lift arms, the two lift arms are lift arm 1 and lift arm 2, the lift arm 1 and lift arm 2 are respectively located on both sides of the shell, the lift arm 1 comprises lift arm 1 connection part A and lift arm 1 connection part B, the lift arm 2 comprises lift arm 2 connection part A and lift arm 2 connection part B; the lift test device comprises a base, during the test, the shell is fixedly connected to the base; the lift test device also comprises a connecting frame, the connecting frame is connected to the base through an adjusting rod 1 and an adjusting rod 2; one end of the adjusting rod 1 is hinged to the Base, the other end of the adjusting rod one is hinged to the connecting frame; one end of the adjusting rod two is hinged to the base, and the other end of the adjusting rod two is hinged to the connecting frame; the lifting device test device also includes a side connecting arm one, a side connecting arm two, and an intermediate connecting arm; one end of the side connecting arm one is hinged to the lifting arm one connecting part A, and the other end of the side connecting arm one is hinged to the adjusting rod one; one end of the side connecting arm two is hinged to the lifting arm two connecting part A, and the other end of the side connecting arm two is hinged to the adjusting rod two; one end of the intermediate connecting arm is hinged to the shell, and the other end of the intermediate connecting arm is hinged to the connecting frame.

[0007] Furthermore, the lifter test device also includes a power part 1 and a power part 2; the fixed end of the power part 1 is hinged to the base, and the moving end of the power part 1 is hinged to the connection part B of the lifting arm 1; the fixed end of the power part 2 is hinged to the base, and the moving end of the power part 2 is hinged to the connection part B of the lifting arm 2.

[0008] Furthermore, the side connecting arm 1 includes a side connecting arm 1 body, and both ends of the side connecting arm 1 body are provided with threaded connection holes, which are respectively a side connecting arm 1 threaded connection hole A and a side connecting arm 1 threaded connection hole B; the side connecting arm 1 also includes a side connecting arm 1 connection part A and a side connecting arm 1 connection part B, the side connecting arm 1 connection part A includes a side connecting arm 1 connection ear A and a side connecting arm 1 threaded rod A fixedly connected together, the side connecting arm 1 connection ear A is hinged to the lifting arm 1, and the side connecting arm 1 threaded rod A is threadedly connected to the side connecting arm 1 threaded connection hole A; the side connecting arm 1 connection part B includes a side connecting arm 1 connection ear B and a side connecting arm 1 threaded rod B fixedly connected together, the side connecting arm 1 connection ear B is hinged to the adjusting rod 1, and the side connecting arm 1 threaded rod B is threadedly connected to the side connecting arm 1 threaded connection hole B.

[0009] Furthermore, a connecting ear B of the side connecting arm is provided with a strip hole of the side connecting arm.

[0010] Furthermore, the side connecting arm 2 includes a side connecting arm 2 body, and both ends of the side connecting arm 2 body are provided with threaded connection holes, which are respectively the side connecting arm 2 threaded connection hole A and the side connecting arm 2 threaded connection hole B; the side connecting arm 2 also includes a side connecting arm 2 connection part A and a side connecting arm 2 connection part B, the side connecting arm 2 connection part A includes a side connecting arm 2 connecting ear A and a side connecting arm 2 threaded rod A fixedly connected together, the side connecting arm 2 connecting ear A is hinged to the lifting arm 2, and the side connecting arm 2 threaded rod A is threadedly connected to the side connecting arm 2 threaded connection hole A; the side connecting arm 2 connection part B includes a side connecting arm 2 connecting ear B and a side connecting arm 2 threaded rod B fixedly connected together, the side connecting arm 2 connecting ear B is hinged to the adjusting rod 2, and the side connecting arm 2 threaded rod B is threadedly connected to the side connecting arm 2 threaded connection hole B.

[0011] Furthermore, two strip-shaped holes are provided on the second connecting ears B of the side connecting arms.

[0012] Furthermore, the intermediate connecting arm includes an intermediate connecting arm body, and both ends of the intermediate connecting arm body are provided with intermediate connecting arm threaded connecting holes, which are respectively intermediate connecting arm threaded connecting hole A and intermediate connecting arm threaded connecting hole B; the intermediate connecting arm also includes an intermediate connecting arm connecting part A and an intermediate connecting arm connecting part B, and the intermediate connecting arm connecting part A includes an intermediate connecting arm connecting ear A and an intermediate connecting arm threaded rod A fixedly connected together, the intermediate connecting arm connecting ear A is hinged to the shell, and the intermediate connecting arm threaded rod A is threadedly connected to the intermediate connecting arm threaded connecting hole A; the intermediate connecting arm connecting part B includes an intermediate connecting arm connecting ear B and an intermediate connecting arm threaded rod B fixedly connected together, the intermediate connecting arm connecting ear B is hinged to the connecting frame, and the intermediate connecting arm threaded rod B is threadedly connected to the intermediate connecting arm threaded connecting hole B.

[0013] Furthermore, a connecting seat is fixedly connected to the shell, and the middle connecting arm is hinged to the connecting seat.

[0014] Furthermore, the lifter testing device also includes a counterweight box, and the counterweight box is connected to the connecting frame via a connecting piece.

[0015] Furthermore, the connecting member is a steel wire rope.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] When the durability of the lifter is tested using the novel lifter test device, the shell of the lifter is fixedly connected to the base. One end of the adjusting rod one is hinged on the base, and the other end of the adjusting rod one is hinged on the connecting frame; one end of the adjusting rod two is hinged on the base, and the other end of the adjusting rod two is hinged on the connecting frame. One end of the side connecting arm one is hinged on the lifting arm one connection part A, and the other end of the side connecting arm one is hinged on the adjusting rod one; one end of the side connecting arm two is hinged on the lifting arm two connection part A, and the other end of the side connecting arm two is hinged on the adjusting rod two; one end of the middle connecting arm is hinged on the shell, and the other end of the middle connecting arm is hinged on the connecting frame. Testing the lifter before mass production can ensure the reliability of the mass-produced lifters in subsequent use, improve the user's work efficiency, and reduce the user's use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the lifter test device (with a lifter) of the utility model;

[0019] Figure 2 yes Figure 1 (without the counterweight box) enlarged stereogram;

[0020] Figure 3 yes Figure 2 A partial enlarged view of the middle A area;

[0021] Figure 4 yes Figure 1 An enlarged stereogram of the lift in FIG.

[0022] Figure 5 yes Figure 1 An enlarged stereoscopic view of a side connecting arm 1 in FIG.

[0023] Figure 6 yes Figure 1 An enlarged stereoscopic view of the middle connecting arm in FIG.

[0024] In the figure, 1, base; 21, adjusting rod 1; 22, adjusting rod 2; 31, side connecting arm 1; 311, side connecting arm 1 body; 312, side connecting arm 1 connecting ear A; 313, side connecting arm 1 connecting ear B; 3131, side connecting arm one bar hole; 32, side connecting arm 2; 33, middle connecting arm; 331, middle connecting arm body; 332, middle connecting arm connecting ear A; 333, middle connecting arm connecting ear B; 41, power part 1; 42, power part 2; 5, connecting seat; 6, connecting frame; 7, counterweight box; 8, lifter; 81, shell; 82, lifting arm 1; 821, lifting arm 1 connecting part A; 822, lifting arm 1 connecting part B; 83, lifting arm 2; 831, lifting arm 2 connecting part A; 832, lifting arm 2 connecting part B. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Combination Figure 4 As shown, the lifter 8 tested using the lifter testing device of the utility model includes a shell 81 and two lift arms, the two lift arms are lift arm 1 82 and lift arm 2 83, lift arm 1 82 and lift arm 2 83 are respectively located on both sides of the shell 81, lift arm 1 82 includes lift arm 1 connection part A 821 and lift arm 1 connection part B 822, lift arm 2 83 includes lift arm 2 connection part A 831 and lift arm 2 connection part B 832.

[0027] Combination Figure 1 , Figure 2 ,as well as Figure 3 As shown together, the lifter test device includes a base 1. During the test, the shell 81 is fixedly connected to the base 1; the base 1 is preferably installed on the ground (not shown in the figure).

[0028] The lifter test device also includes a connecting frame 6, which is connected to the base 1 through an adjusting rod 1 21 and an adjusting rod 2 22. One end of the adjusting rod 1 21 is hinged on the base 1, and the other end of the adjusting rod 1 21 is hinged on the connecting frame 6; one end of the adjusting rod 22 is hinged on the base 1, and the other end of the adjusting rod 22 is hinged on the connecting frame 6.

[0029] The lifter test device also includes a side connecting arm 1 31, a side connecting arm 2 32, and an intermediate connecting arm 33. One end of the side connecting arm 1 31 is hinged on the lifting arm 1 connection part A 821, and the other end of the side connecting arm 1 31 is hinged on the adjustment rod 1 21; one end of the side connecting arm 2 32 is hinged on the lifting arm 2 connection part A 831, and the other end of the side connecting arm 2 32 is hinged on the adjustment rod 2 22; one end of the intermediate connecting arm 33 is hinged on the housing 81, and the other end of the intermediate connecting arm 33 is hinged on the connecting frame 6. A connecting seat 5 is fixedly connected to the housing 81, and the intermediate connecting arm 33 is preferably hinged on the connecting seat 5.

[0030] The lifting device test device also includes a power piece 41 and a power piece 42; the fixed end of the power piece 41 is hinged on the base 1, and the action end of the power piece 41 is hinged on the lifting arm 1 connection part B 822; the fixed end of the power piece 42 is hinged on the base 1, and the action end of the power piece 42 is hinged on the lifting arm 2 connection part B 832.

[0031] The power member 1 41 and the power member 2 42 are preferably oil cylinders. Of course, the power member 1 41 and the power member 2 42 can also be other conventional electric cylinders, air cylinders and other power members that can provide power, which will not be described in detail here.

[0032] Combination Figure 2 , Figure 3 ,as well as Figure 5 As shown in the figure, the side connecting arm 31 includes a side connecting arm body 311, and both ends of the side connecting arm body 311 are provided with threaded connection holes, namely, a side connecting arm threaded connection hole A (not shown in the figure) and a side connecting arm threaded connection hole B (not shown in the figure). The side connecting arm 31 also includes a side connecting arm connection part A and a side connecting arm connection part B. The side connecting arm connection part A includes a side connecting arm connection ear A 312 and a side connecting arm threaded rod A (not shown in the figure) fixedly connected together. The side connecting arm connection ear A 312 is hinged on the lifting arm 82, and the side connecting arm threaded rod A is threadedly connected to the side connecting arm threaded connection hole A. The side connecting arm-connecting part B includes a side connecting arm-connecting ear B 313 and a side connecting arm-threaded rod B (not shown in the figure) fixedly connected together, the side connecting arm-connecting ear B 313 is hinged on the adjusting rod 21, and the side connecting arm-threaded rod B is threadedly connected to the side connecting arm-threaded connection hole B.

[0033] The thread rotation direction of the threaded rod A of the side connecting arm is the same as that of the threaded rod B of the side connecting arm, and the thread rotation direction of the threaded connection hole A of the side connecting arm is opposite to that of the threaded connection hole B of the side connecting arm.

[0034] Preferably, a side connecting arm connecting ear B 313 is provided with a side connecting arm bar hole 3131 .

[0035] The side connecting arm 2 32 includes a side connecting arm 2 body, and both ends of the side connecting arm 2 body are provided with threaded connection holes, which are the side connecting arm 2 threaded connection hole A (not shown in the figure) and the side connecting arm 2 threaded connection hole B (not shown in the figure). The side connecting arm 2 32 also includes the side connecting arm 2 connection part A and the side connecting arm 2 connection part B, the side connecting arm 2 connection part A includes the side connecting arm 2 connection ear A and the side connecting arm 2 threaded rod A (not shown in the figure) fixedly connected together, the side connecting arm 2 connection ear A is hinged on the lifting arm 2 83, and the side connecting arm 2 threaded rod A is threadedly connected to the side connecting arm 2 threaded connection hole A. The side connecting arm 2 connection part B includes the side connecting arm 2 connection ear B and the side connecting arm 2 threaded rod B (not shown in the figure) fixedly connected together, the side connecting arm 2 connection ear B is hinged on the adjustment rod 2 22, and the side connecting arm 2 threaded rod B is threadedly connected to the side connecting arm 2 threaded connection hole B.

[0036] The thread rotation directions of the second threaded rod A of the side connecting arm and the second threaded rod B of the side connecting arm are the same, and the thread rotation directions of the second threaded connection holes A of the side connecting arm and the second threaded connection holes B of the side connecting arm are opposite.

[0037] Preferably, two bar-shaped holes are provided on the two connecting ears B of the side connecting arm.

[0038] Combination Figure 2 , Figure 3 ,as well as Figure 6As shown together, the intermediate connecting arm 33 includes an intermediate connecting arm body 331, and both ends of the intermediate connecting arm body 331 are provided with intermediate connecting arm threaded connection holes, which are intermediate connecting arm threaded connection hole A (not shown in the figure) and intermediate connecting arm threaded connection hole B (not shown in the figure). The intermediate connecting arm 33 also includes an intermediate connecting arm connecting portion A and an intermediate connecting arm connecting portion B. The intermediate connecting arm connecting portion A includes an intermediate connecting arm connecting ear A332 and an intermediate connecting arm threaded rod A (not shown in the figure) that are fixedly connected together. The intermediate connecting arm connecting ear A332 is hinged on the connecting seat 5, and the intermediate connecting arm threaded rod A is threadedly connected to the intermediate connecting arm threaded connection hole A. The intermediate connecting arm connecting portion B includes an intermediate connecting arm connecting ear B333 and an intermediate connecting arm threaded rod B (not shown in the figure) that are fixedly connected together. The intermediate connecting arm connecting ear B333 is hinged on the connecting frame 6, and the intermediate connecting arm threaded rod B is threadedly connected to the intermediate connecting arm threaded connection hole B.

[0039] The threaded rotation directions of the intermediate connecting arm threaded rod A and the intermediate connecting arm threaded rod B are the same, and the threaded rotation directions of the intermediate connecting arm threaded connection hole A and the intermediate connecting arm threaded connection hole B are opposite.

[0040] Combination Figure 1 As shown, the lifter test device further comprises a counterweight box 7, and the counterweight box 7 is connected to the connecting frame 6 via a connecting member. The connecting member is preferably a steel wire rope (not shown in the figure).

[0041] Preferably, a groove (not shown) is dug on the ground, and the counterweight box 7 can be placed in the groove, so that the counterweight box 7 can be prevented from falling from a high altitude, effectively ensuring the personal safety of the operator. According to the load to be simulated, a counterweight block (not shown) can be placed in the counterweight box 7 to facilitate durability tests under different weights.

[0042] The following is a detailed description of the process of testing the lifter 8 using the lifter testing device of the utility model:

[0043] The side connecting arm 1 31, the middle connecting arm 33, and the side connecting arm 2 32 are adjusted according to the model of the lifter 8 to be tested. The adjustment of the side connecting arm 1 31, the middle connecting arm 33, and the side connecting arm 2 32 is achieved by screwing the side connecting arm 1 body 311, the middle connecting arm body 331, and the side connecting arm 2 body. After adjusting the side connecting arm 1 31, the middle connecting arm 33, and the side connecting arm 2 32, the amount of the counterweight in the counterweight box 7 is adjusted according to the size of the simulated load. After the preparation work is completed, the durability of the lifter 8 is tested under the action of the power piece 1 41 and the power piece 2 42.

[0044] The technical features with serial number names involved in this specification (such as adjusting rod 1, adjusting rod 2, side connecting arm 1, side connecting arm 1 body, side connecting arm 1 connecting ear A, side connecting arm 1 connecting ear B, a side connecting arm bar hole, side connecting arm 2, side connecting arm 2 body, side connecting arm 2 connecting ear A, side connecting arm 2 connecting ear B, side connecting arm 2 bar holes, middle connecting arm connecting ear A, middle connecting arm connecting ear B, power part 1, power part 2, lifting arm 1, lifting arm 1 connection part A, lifting arm 1 connection part B, lifting arm 2, lifting arm 2 connection part A, lifting arm 2 connection part B, etc.) are only for distinguishing the various technical features and do not represent the positional relationship, installation sequence and working sequence between the various technical features.

[0045] In the description of this specification, it needs to be understood that the orientation or positional relationship described in “side connecting arm one”, “side connecting arm one body”, “side connecting arm one connecting ear A”, “side connecting arm one connecting ear B”, “side connecting arm one strip hole”, “side connecting arm two”, “side connecting arm two body”, “side connecting arm two connecting ear A”, “side connecting arm two connecting ear B”, “side connecting arm two strip hole”, “middle connecting arm”, “middle connecting arm body”, “middle connecting arm connecting ear A”, “middle connecting arm connecting ear B”, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0046] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A lifter test device, wherein the lifter tested by the lifter test device comprises a shell and two lift arms, wherein the two lift arms are lift arm 1 and lift arm 2, respectively, wherein the lift arm 1 and the lift arm 2 are located on both sides of the shell, respectively, wherein the lift arm 1 comprises a lift arm 1 connection part A and a lift arm 1 connection part B, and the lift arm 2 comprises a lift arm 2 connection part A and a lift arm 2 connection part B; wherein: The lifter test device comprises a base, and during the test, the shell is fixedly connected to the base; The lifter test device also includes a connecting frame, which is connected to the base through an adjusting rod 1 and an adjusting rod 2; one end of the adjusting rod 1 is hinged to the base, and the other end of the adjusting rod 1 is hinged to the connecting frame; one end of the adjusting rod 2 is hinged to the base, and the other end of the adjusting rod 2 is hinged to the connecting frame; The lifter test device also includes a side connecting arm 1, a side connecting arm 2, and an intermediate connecting arm; one end of the side connecting arm 1 is hinged to the lifting arm 1 connection part A, and the other end of the side connecting arm 1 is hinged to the adjusting rod 1; one end of the side connecting arm 2 is hinged to the lifting arm 2 connection part A, and the other end of the side connecting arm 2 is hinged to the adjusting rod 2; one end of the intermediate connecting arm is hinged to the shell, and the other end of the intermediate connecting arm is hinged to the connecting frame.

2. The lifter testing device according to claim 1, characterized in that: The lifter test device also includes a power part 1 and a power part 2; the fixed end of the power part 1 is hinged to the base, and the moving end of the power part 1 is hinged to the connection part B of the lifting arm 1; the fixed end of the power part 2 is hinged to the base, and the moving end of the power part 2 is hinged to the connection part B of the lifting arm 2.

3. The lifter testing device according to claim 2, characterized in that: The side connecting arm 1 includes a side connecting arm 1 body, and both ends of the side connecting arm 1 body are provided with threaded connection holes, which are respectively a side connecting arm 1 threaded connection hole A and a side connecting arm 1 threaded connection hole B; the side connecting arm 1 also includes a side connecting arm 1 connection part A and a side connecting arm 1 connection part B, the side connecting arm 1 connection part A includes a side connecting arm 1 connection ear A and a side connecting arm 1 threaded rod A fixedly connected together, the side connecting arm 1 connection ear A is hinged to the lifting arm 1, and the side connecting arm 1 threaded rod A is threadedly connected to the side connecting arm 1 threaded connection hole A; the side connecting arm 1 connection part B includes a side connecting arm 1 connection ear B and a side connecting arm 1 threaded rod B fixedly connected together, the side connecting arm 1 connection ear B is hinged to the adjusting rod 1, and the side connecting arm 1 threaded rod B is threadedly connected to the side connecting arm 1 threaded connection hole B.

4. The lifter testing device according to claim 3, characterized in that: A connecting ear B of the side connecting arm is provided with a strip hole of the side connecting arm.

5. The lifter testing device according to claim 2, characterized in that: The side connecting arm 2 includes a side connecting arm 2 body, and both ends of the side connecting arm 2 body are provided with threaded connection holes, which are the side connecting arm 2 threaded connection hole A and the side connecting arm 2 threaded connection hole B respectively; the side connecting arm 2 also includes a side connecting arm 2 connection part A and a side connecting arm 2 connection part B, the side connecting arm 2 connection part A includes a side connecting arm 2 connection ear A and a side connecting arm 2 threaded rod A fixedly connected together, the side connecting arm 2 connection ear A is hinged to the lifting arm 2, and the side connecting arm 2 threaded rod A is threadedly connected to the side connecting arm 2 threaded connection hole A; the side connecting arm 2 connection part B includes a side connecting arm 2 connection ear B and a side connecting arm 2 threaded rod B fixedly connected together, the side connecting arm 2 connection ear B is hinged to the adjusting rod 2, and the side connecting arm 2 threaded rod B is threadedly connected to the side connecting arm 2 threaded connection hole B.

6. The lifter testing device according to claim 5, characterized in that: The two connecting ears B of the side connecting arm are provided with two strip holes of the side connecting arm.

7. The lifter testing device according to claim 2, characterized in that: The intermediate connecting arm includes an intermediate connecting arm body, and both ends of the intermediate connecting arm body are provided with intermediate connecting arm threaded connecting holes, which are intermediate connecting arm threaded connecting hole A and intermediate connecting arm threaded connecting hole B respectively; the intermediate connecting arm also includes an intermediate connecting arm connecting part A and an intermediate connecting arm connecting part B, the intermediate connecting arm connecting part A includes an intermediate connecting arm connecting ear A and an intermediate connecting arm threaded rod A fixedly connected together, the intermediate connecting arm connecting ear A is hinged to the shell, and the intermediate connecting arm threaded rod A is threadedly connected to the intermediate connecting arm threaded connecting hole A; the intermediate connecting arm connecting part B includes an intermediate connecting arm connecting ear B and an intermediate connecting arm threaded rod B fixedly connected together, the intermediate connecting arm connecting ear B is hinged to the connecting frame, and the intermediate connecting arm threaded rod B is threadedly connected to the intermediate connecting arm threaded connecting hole B.

8. The lifter testing device according to claim 1, characterized in that: A connecting seat is fixedly connected to the shell, and the middle connecting arm is hinged to the connecting seat.

9. The lifter testing device according to claim 1, characterized in that: The lifter testing device also includes a counterweight box, which is connected to the connecting frame via a connecting piece.

10. The lifter testing device according to claim 9, characterized in that: The connecting piece is a steel wire rope.

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