Free drop testing machine

Abstract

The invention discloses a free drop testing machine, and relates to the technical field of free drop testing machines, the free drop testing machine comprises a machine body, the machine body is provided with a floor, a base fixed on the floor and a standing pile vertically fixed on the side wall of the base, the outer wall of a main shaft is sleeved with a lifting box capable of automatically lifting up and down, and a turnover plate is arranged in a turnover notch. The turnover plate can alternately turn over in the horizontal direction and the vertical direction to change the position, an objective table is fixed to the end of the turnover plate, the end of the L-shaped drawing rod extends downwards and is connected with an adapter, the objective table is used for supporting a to-be-tested object, and the adapter is used for pressing and abutting against the corner or edge of the to-be-supported object. And the object to be tested is kept in an experimental state by cooperating with the objective table to wait for free falling. According to the invention, the flat side wall of the object can be used as a landing drop surface to carry out a drop test, the corner and edge side wall of the object can be used as the landing drop surface to carry out the drop test, the object drop test requirement is met, and the drop bearing capability of the object is detected.

Description

Technical Field

[0001] The invention relates to the technical field of free fall testing machines, in particular to a free fall testing machine. Background Art

[0002] The free drop tester is a device for quality inspection of objects, which can be divided into single-wing and double-wing types. Application scenarios: It mainly simulates the anti-drop and impact performance of larger and heavier packaged products. Its strong hydraulic power system and unique sample holder facilitate easy loading and unloading of oversized and overweight objects. The equipment is mainly used to assess the ability of product packaging to withstand drops during transportation and loading and unloading, so as to improve and perfect packaging design; it is suitable for various manufacturers, quality inspection departments and scientific research institutions that need to test product drop performance.

[0003] At present, during the drop test of the free fall tester, the object to be tested is placed on the support platform, kept motionless, and raised to the test height. The support platform and the object to be tested are separated, and the object to be tested performs free fall motion and falls to the ground to complete the test. This process can only be used to perform drop tests on a single surface of the object. However, if some objects need to be dropped on corners or edges, the existing free fall tester support platform can only support a relatively large surface of the object and keep it motionless. However, if the corners or edges cannot stand stably on the support platform, the free fall test cannot be performed in the state of the corners or edges, and the experimental requirements cannot be met. Summary of the invention

[0004] The object of the present invention is to provide a free fall tester to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a free fall test machine, comprising: The machine body comprises a floor, a base fixed on the floor, and a standing pile fixed vertically to the side wall of the base, a top plate is horizontally arranged on the top of the standing pile, a main shaft is fixed between the top plate and the base, and a lifting box which can automatically rise and fall is sleeved on the outer wall of the main shaft; A lifting seat is fixed to the bottom wall of the lifting box, a flip notch is provided at the bottom end of the lifting seat, a flip plate is provided in the flip notch, the flip plate can be flipped and changed alternately in the horizontal direction and the vertical direction, and a loading platform is fixed at the end of the flip plate; A straightening member, the straightening member comprising a guide rail fixed to the side wall of the lifting box, a rectangular sleeve adjustable in the vertical direction and an L-shaped draw rod slidably inserted in the rectangular sleeve, the end of the L-shaped draw rod extending downward and connected to an adapter head; The adapter head is located directly above the stage, and the stage is used to hold up the object to be tested. The adapter head is used to press down against the corner or edge of the object to be held up, and cooperate with the stage to keep the object to be tested in an experimental state waiting for free fall.

[0006] In a further embodiment, the lifting box is provided with a lifting socket passing through the upper and lower side walls, the lifting socket is slidably connected to the outer wall of the main shaft, a motor is fixed to the side wall of the lifting box, a transmission roller is fixed to the output end of the motor, the transmission roller rotates and extends into the lifting box, and is located on the side of the main shaft.

[0007] In a further embodiment, the radial side wall of the driving roller is provided with a curved recessed portion which rolls in contact with the radial side wall of the main shaft, the side wall of the curved recessed portion is provided with a plurality of tooth blocks arranged in a ring structure, and the radial side wall of the main shaft is provided with a tooth groove which meshes with the tooth block.

[0008] In a further embodiment, the outer wall of the lifting box is slidingly fitted with the side wall of the standing pile.

[0009] In a further embodiment, a cylinder is embedded in the lifting seat in the vertical direction, and the telescopic end of the cylinder is connected to a push plate that can extend into the flip notch. The push plate is located on the side of the flip plate, and a plurality of tooth blocks 2 are provided on the side wall of the push plate facing the flip plate. The end of the flip plate located in the flip notch is a columnar structure, and a plurality of tooth blocks 3 are provided on the outer wall of the columnar structure. The tooth gap between the tooth block 2 and two adjacent tooth blocks 3 is clamped.

[0010] In a further embodiment, an arc-shaped pressure plate extending to the outside of the lifting seat is fixed to the top wall of the flip notch, the arc-shaped pressure plate is an elastic plate, and the upper end surface of the flip plate is provided with a slideway that slidably engages with the end of the arc-shaped pressure plate.

[0011] In a further embodiment, an arc-shaped pressure plate extending to the outside of the lifting seat is fixed to the top wall inside the flip notch, the arc-shaped pressure plate is an elastic plate, a clamping column is fixed to the upper end surface of the flip plate, and the bottom wall at the end of the arc-shaped pressure plate is provided with a clamping notch that can be clamped in the outer wall of the clamping column.

[0012] In a further embodiment, a vertically distributed T-shaped slide groove is provided on the side wall of the guide rail, one end of the rectangular sleeve extends into the T-shaped slide groove and is fixed with a slider that is slidably engaged with the T-shaped slide groove; A limited sliding hole is provided on the upper end surface of the rectangular sleeve, and a clamping block which is slidably engaged with the sliding block is fixed on the upper side wall of one end of the L-shaped draw rod located in the rectangular sleeve.

[0013] In a further embodiment, the adapter head includes an upper plate fixed to the lower side wall of the end of the L-shaped draw rod, a lower plate, and a plurality of T-shaped ejector pins distributed in a matrix and slidably plugged into the lower plate, a connecting column is fixed at the corner position between the upper plate and the lower plate, a lifting gap is left between the upper plate and the lower plate, and the lower plate is provided with a plurality of plugging holes arranged in a matrix and plugged into the plurality of T-shaped ejector pins; The bottom end surfaces of the plurality of T-shaped ejector pins are positioning planes that are pressed down on the object to be tested.

[0014] In a further embodiment, a threaded rod is vertically fixed to one end of the L-shaped draw rod away from the clamping block, a counterweight plate is threadedly sleeved on the outer wall of the threaded rod, and the threaded rod and the counterweight plate form a counterweight member.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention is a free-fall tester, which not only satisfies the requirement of carrying out a drop test on the flat side wall of an object as a falling surface, but also can change the position of the object on a loading platform so that the object faces the ground and remains motionless, and the loading platform is flipped over to separate from the object, and the object performs free-fall motion, so that the edges and corners of the test object touch the ground to complete the drop test, thereby meeting the drop test requirements of the object's surface, edges and corners, detecting the object's ability to withstand a fall, and providing detection assistance for improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the disassembly structure of the push plate, the flip plate and the loading platform of the present invention; Figure 3 It is a schematic diagram of another improved structure of the flip plate and the arc-shaped pressing plate of the present invention; Figure 4 It is a schematic diagram of the local structure of the assembly of the transmission roller and the main shaft of the present invention; Figure 5 It is a schematic diagram of the structure of the straightening member of the present invention; Figure 6 It is a schematic diagram of the structure of the adapter head of the present invention; Figure 7 is a cross-sectional view of the adapter head of the present invention; Figure 8 For the present invention Figure 7 A magnified view of the structure at center; Fig. 9 It is a schematic diagram of the assembly structure of the L-shaped draw rod and the counterweight of the present invention.

[0017] In the figure: 1. floor; 11. base; 12. standing pile; 13. top plate; 14. main shaft; 2. lifting box; 21. lifting seat; 22. flip plate; 221. slideway; 222. gear block three; 223. clamping column; 23. loading platform; 24. arc pressure plate; 25. transmission roller; 26. gear block one; 27. push plate; 28. gear block two; 3. guide rail; 31. rectangular sleeve; 32. L-shaped pull rod; 33. upper plate; 34. lower plate; 35. T-shaped ejector pin; 36. clamping block; 37. threaded rod; 38. counterweight plate. DETAILED DESCRIPTION

[0018] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment, this embodiment provides a free fall test machine, such as Figure 1 As shown, it includes: a body, the body has a floor 1, a base 11 fixed on the floor 1 and a standing pile 12 vertically fixed to the side wall of the base 11, a top plate 13 is horizontally provided on the top of the standing pile 12, a main shaft 14 is fixed between the top plate 13 and the base 11, and the outer wall of the main shaft 14 is provided with a lifting box 2 which can automatically rise and fall.

[0020] Specifically, if Figure 4 As shown, the lifting box 2 is provided with a lifting socket penetrating the upper and lower side walls, and the lifting socket is slidably sleeved with the outer wall of the main shaft 14. A motor is fixed to the side wall of the lifting box 2, and a transmission roller 25 is fixed to the output end of the motor. The transmission roller 25 rotates and extends into the lifting box 2 and is located at the side of the main shaft 14. The radial side wall of the transmission roller 25 is provided with a curved concave portion that rolls with the radial side wall of the main shaft 14. A plurality of tooth blocks 26 arranged in an annular structure are provided on the side wall of the curved concave portion. The radial side wall of the main shaft 14 is provided with a tooth groove that meshes with the tooth block 26. As long as the motor is started, it provides power to the transmission roller 25, and then the tooth block 26 rolls along the tooth groove, which can drive the lifting box 2 to rise and fall in the axial direction of the main shaft 14.

[0021] In addition, the outer wall of the lifting box 2 slides in contact with the side wall of the standing pile 12. During the up and down lifting process, the lifting box 2 can be closely attached to the side wall of the standing pile 12, and the side wall of the standing pile 12 is used to provide support for the lifting box 2 during the up and down lifting process, thereby ensuring the lifting stability of the lifting box 2 and preventing large-scale shaking.

[0022] like Figure 1As shown, a lifting seat 21 is fixed to the bottom wall of the lifting box 2, a flip notch is provided at the bottom end of the lifting seat 21, a flip plate 22 is provided in the flip notch, the flip plate 22 can be flipped and changed alternately in the horizontal direction and the vertical direction, and a loading platform 23 is fixed at the end of the flip plate 22, and the loading platform 23 will follow the lifting box 2 that is lifted up and down to perform synchronous upgrading operations. The loading platform 23 is used to support the object to follow the lifting box 2 to rise to a predetermined height, waiting for the free fall drop test operation.

[0023] The test can only be carried out after the stage 23 is separated from the object to be tested. Figure 2 As shown, a cylinder is embedded in the vertical direction of the lifting seat 21, and the telescopic end of the cylinder is connected to a push plate 27 that can extend into the flip notch. The push plate 27 is located at the side of the flip plate 22, and a plurality of tooth blocks 2 28 are arranged on the side wall of the push plate 27 facing the flip plate 22. The end of the flip plate 22 located in the flip notch is a columnar structure, and a plurality of tooth blocks 3 222 are arranged on the outer wall of the columnar structure. The tooth gaps between the tooth blocks 2 28 and the adjacent two tooth blocks 3 222 are engaged. The extension or contraction of the telescopic end of the cylinder can drive the push plate 27 to move synchronously, so that the tooth block 2 28 can be used to move the tooth block 3 222 to rotate and adjust the position with the columnar structure as the rotation center, thereby driving the flip plate 22 to swing up and down. Here, the swing amplitude of the flip plate 22 is within the range of 0-90°, and the tooth block 28 is used as a pusher, which is stuck in the gap between two adjacent tooth blocks 3 222 and moves up and down. When it moves downward, the flip plate 22 can be flipped to a horizontal state, and the stage 23 can be adjusted to a horizontal state to support the object to be tested. Then, when the tooth block 28 quickly shrinks upward and disengages from the gap between two adjacent tooth blocks 3 222, the tooth block 3 222 loses its limit and is affected by its own gravity. The flip plate 22 flips to a vertical state and can be detached from under the object to be tested, without affecting the object's drop test.

[0024] Here, an arc-shaped pressure plate 24 extending to the outside of the lifting seat 21 is fixed on the top wall in the flip notch. The arc-shaped pressure plate 24 is an elastic plate. A slideway 221 is provided on the upper end surface of the flip plate 22, which is slidably engaged with the end of the arc-shaped pressure plate 24. The elastic potential energy generated by the arc-shaped pressure plate 24 is used to make the flip plate 22 tend to flip quickly, thereby accelerating the speed at which the loading platform 23 separates from the object to be tested.

[0025] You can also use Figure 3In the manner shown, an arc-shaped pressing plate 24 extending to the outside of the hanging seat 21 is fixed to the top wall in the flip notch, and the arc-shaped pressing plate 24 is an elastic plate. A clamping column 223 is fixed to the upper end surface of the flip plate 22, and a clamping notch that can be clamped in the outer wall of the clamping column 223 is provided on the bottom wall of the end of the arc-shaped pressing plate 24. The clamping column 223 pushes the arc-shaped pressing plate 24 upward, so that the arc-shaped pressing plate 24 bends and deforms to generate elastic force. The elastic potential energy generated by the arc-shaped pressing plate 24 is used to make the flip plate 22 have a tendency to flip quickly, thereby accelerating the speed at which the stage 23 is separated from the object to be tested.

[0026] The above drop test can only be performed on the surface of the object to be tested that is relatively flat and placed on the stage 23, and the stage 23 is left to detach from the object before the drop test is performed. When the drop test is performed on the corners or edges, it cannot be stably placed on the stage 23 and not fall. For this purpose, a straightening member is also provided, such as Figure 1 and Figure 5 As shown, the straightening member includes a guide rail 3 fixed to the side wall of the lifting box 2, a rectangular sleeve 31 which is adjustable in the vertical direction and an L-shaped draw rod 32 which is slidably inserted in the rectangular sleeve 31, and the end of the L-shaped draw rod 32 extends downward and is connected to an adapter. Figure 1 As shown, the adapter head is located directly above the stage 23, and the stage 23 is used to hold up the object to be tested. The adapter head is used to press down against the corners or edges of the object to be held up, and cooperate with the stage 23 to keep the object to be tested in an experimental state waiting for free fall.

[0027] Specifically, if Figure 5 As shown, a vertically distributed T-shaped slot is provided on the side wall of the guide rail 3, one end of the rectangular sleeve 31 extends into the T-shaped slot and is fixed with a slider that is slidably engaged with the T-shaped slot, a limited sliding hole is provided on the upper end surface of the rectangular sleeve 31, and a block 36 that is slidably engaged with the slider is fixed on the upper side wall of one end of the L-shaped draw rod 32 located in the rectangular sleeve 31, and the rectangular sleeve 31 and the L-shaped draw rod 32 form a support member for supporting the adapter head, and when the adapter head needs to be pressed down against the object to be measured, the slider of the rectangular sleeve 31 slides down along the T-shaped slot, and then the adapter head is pressed down. In addition, the L-shaped draw rod 32 can also slide horizontally along the rectangular sleeve 31 to adjust the downward position of the adapter head.

[0028] The adapter head includes an upper plate 33 fixed to the lower side wall of the end of the L-shaped draw rod 32, a lower plate 34, and a plurality of T-shaped ejector pins 35 distributed in a matrix and slidably plugged into the lower plate 34. A connecting column is fixed at the corner position between the upper plate 33 and the lower plate 34, and a lifting gap is left between the upper plate 33 and the lower plate 34. The lower plate 34 is provided with a plurality of plug holes arranged in a matrix and plugged into the plurality of T-shaped ejector pins 35. Figure 1 , Figure 6 , Figure 7 and Figure 8As shown, the bottom end faces of the multiple T-shaped ejector pins 35 are the positioning planes pressed down on the object to be tested. Therefore, in the initial state, the bottom end faces of the T-shaped ejector pins 35 are flush with each other. When the side wall of the bottom end of the T-shaped ejector pins 35 contacts the surface wall of the object to be tested, it will slide upward along the corresponding plug-in hole. The lifting gap serves as a buffer space for the T-shaped ejector pins 35 to slide upward. Then, the T-shaped ejector pins 35 that are not in contact with the surface wall of the object to be tested are located in the plug-in hole and do not slide and adjust. The multiple T-shaped ejector pins 35 that are in contact with the surface wall of the object to be tested and are lifted upward are in real time in contact with the object to be tested, while the height of the T-shaped ejector pins 35 that are not in contact does not change, forming a limit structure around the object to be tested to prevent the object to be tested from deviating.

[0029] For example, when a corner of a packaging box is subjected to a drop test, one of the corners of the packaging box needs to be located on the upper end surface of the loading platform 23, and the diagonal position needs to contact the bottom ends of multiple T-shaped ejector pins 35. The height of the T-shaped ejector pin 35 facing the diagonal position is adjusted to be higher, and the bottom ends of the other multiple T-shaped ejector pins 35 will contact the three side walls of the diagonal position in real time, forming a limit around the diagonal position to ensure that the packaging box is in a state of falling with the corner facing each other. As long as the loading platform 23 is flipped off the packaging box, the packaging box can fall freely to perform the drop test.

[0030] For another example, when a drop test is performed on the edge of a packaging box, one of the edge of the packaging box needs to be located on the upper end surface of the loading platform 23, and the other edge of the packaging box needs to contact the bottom ends of multiple T-shaped ejector pins 35, while the height of the T-shaped ejector pins 35 is raised, and the bottom ends of the remaining multiple T-shaped ejector pins 35 will contact the two side walls of the edge in real time, forming a limit position on both sides of the edge to ensure that the packaging box is in a state where the edge falls to the ground. As long as the loading platform 23 is flipped off the packaging box, the packaging box can fall freely to perform the drop test.

[0031] like Fig. 9 As shown, a threaded rod 37 is vertically fixed to one end of the L-shaped draw rod 32 away from the clamping block 36, and a counterweight plate 38 is threadedly sleeved on the outer wall of the threaded rod 37, and the threaded rod 37 and the counterweight plate 38 form a counterweight. For objects with relatively light weight, such as the drop test of a plastic cup, it may need to be raised to a very high height to meet the test requirements because of its light weight, but the actual equipment has a limited rise height after all. Then, by counterweighting the object to be tested, according to the test requirements, a corresponding number of counterweight plates 38 can be threadedly connected to the outer wall of the threaded rod 37 to speed up its falling speed, and by increasing the dynamic potential energy in the initial state, the impact force when landing can be increased, thereby realizing the test of its anti-drop performance.

[0032] In summary, the above drop test equipment not only satisfies the requirement of drop test on the flat side wall of the object as the falling surface, but also can change the position of the object on the stage 23 so that the object faces the ground and remains stationary, and the stage 23 is flipped off the object, and the object performs free fall motion, so that the edges and corners of the test object touch the ground to complete the drop test, which meets the drop test requirements of the object surface, edges and corners, detects the ability of the object to withstand the drop, and provides detection assistance for improving product quality. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Free fall testing machine, characterized in that, include: A machine body, the machine body comprising a floor (1), a base (11) fixed on the floor (1), and a standing pile (12) fixed vertically to a side wall of the base (11); a top plate (13) is transversely arranged at the top of the standing pile (12); a main shaft (14) is fixed between the top plate (13) and the base (11); and a lifting box (2) capable of automatically lifting up and down is sleeved on the outer wall of the main shaft (14); A lifting seat (21) is fixed to the bottom wall of the lifting box (2), a flip notch is provided at the bottom end of the lifting seat (21), a flip plate (22) is provided in the flip notch, the flip plate (22) can be flipped alternately in the horizontal direction and the vertical direction to change position, and a loading platform (23) is fixed to the end of the flip plate (22); A straightening member, the straightening member comprising a guide rail (3) fixed to a side wall of the lifting box (2), a rectangular sleeve (31) adjustable in a vertical direction on the guide rail (3), and an L-shaped draw rod (32) slidably inserted into the rectangular sleeve (31), the end of the L-shaped draw rod (32) extending downward and connected to an adapter head; The adapter head is located directly above the stage (23), the stage (23) is used to hold up the object to be tested, and the adapter head is used to press down against the corner or edge of the object to be held up, and cooperate with the stage (23) to keep the object to be tested in an experimental state and wait for free fall.

2. The free fall tester according to claim 1, characterized in that: The lifting box (2) is provided with a lifting socket penetrating through the upper and lower side walls, the lifting socket being slidably sleeved with the outer wall of the main shaft (14), a motor being fixed to the side wall of the lifting box (2), a transmission roller (25) being fixed to the output end of the motor, the transmission roller (25) being rotatably extended into the lifting box (2) and being located at the side of the main shaft (14).

3. The free fall tester according to claim 2, characterized in that: The radial side wall of the driving roller (25) is provided with a curved recessed portion that rolls in contact with the radial side wall of the main shaft (14); a plurality of tooth blocks (26) arranged in an annular structure are provided on the side wall of the curved recessed portion; and a tooth groove that meshes with the tooth block (26) is provided on the radial side wall of the main shaft (14).

4. The free fall tester according to claim 3, characterized in that: The outer wall of the lifting box (2) is slidably fitted with the side wall of the standing pile (12).

5. The free fall tester according to claim 1, characterized in that: A cylinder is embedded in the lifting seat (21) in the vertical direction, and the telescopic end of the cylinder is connected to a push plate (27) that can extend into the flip notch. The push plate (27) is located at the side of the flip plate (22), and a plurality of tooth blocks (28) are provided on the side wall of the push plate (27) facing the flip plate (22). The end of the flip plate (22) located in the flip notch is a columnar structure, and a plurality of tooth blocks (222) are provided on the outer wall of the columnar structure. The tooth gap between the tooth block (28) and two adjacent tooth blocks (222) is clamped.

6. The free fall tester according to claim 5, characterized in that: An arc-shaped pressing plate (24) extending to the outside of the hanging seat (21) is fixed to the top wall of the flip notch, the arc-shaped pressing plate (24) being an elastic plate, and a slideway (221) slidably engaged with the end of the arc-shaped pressing plate (24) is provided on the upper end surface of the flip plate (22).

7. The free fall tester according to claim 5, characterized in that: An arc-shaped pressing plate (24) extending to the outside of the hanging seat (21) is fixed to the top wall of the flip notch, the arc-shaped pressing plate (24) being an elastic plate, a clamping column (223) being fixed to the upper end surface of the flip plate (22), and a clamping notch capable of being clamped in the outer wall of the clamping column (223) is provided on the bottom wall of the end of the arc-shaped pressing plate (24).

8. The free fall tester according to claim 1, characterized in that: A vertically distributed T-shaped slide groove is provided on the side wall of the guide rail (3); one end of the rectangular sleeve (31) extends into the T-shaped slide groove and is fixed with a sliding block that is slidably engaged with the T-shaped slide groove; A limiting sliding hole is provided on the upper end surface of the rectangular sleeve (31); a clamping block (36) slidably engaged with the sliding block is fixed to the upper side wall of one end of the L-shaped draw rod (32) located in the rectangular sleeve (31).

9. The free fall tester according to claim 4, characterized in that: The adapter head comprises an upper plate (33) fixed to the lower side wall of the end of the L-shaped draw rod (32), a lower plate (34), and a plurality of T-shaped ejector pins (35) arranged in a matrix and slidably plugged into the lower plate (34); a connecting column is fixed at a corner position between the upper plate (33) and the lower plate (34); a lifting gap is left between the upper plate (33) and the lower plate (34); and the lower plate (34) is provided with a plurality of plugging holes arranged in a matrix and plugged into the plurality of T-shaped ejector pins (35); The bottom end surfaces of the plurality of T-shaped ejector pins (35) are positioning planes that are pressed down on the object to be tested.

10. The free fall tester according to claim 1, characterized in that: A threaded rod (37) is vertically fixed to one end of the L-shaped draw rod (32) away from the clamping block (36); a counterweight plate (38) is threadedly sleeved on the outer wall of the threaded rod (37); the threaded rod (37) and the counterweight plate (38) form a counterweight member.

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