Collision test device for vehicle bottom plate

Abstract

The invention discloses a vehicle bottom plate collision test device which comprises a bottom frame, sliding rails are fixedly installed on the two sides of the top end of the bottom frame respectively, a traction machine is arranged between the sliding rails, the top of the traction machine is connected with a mounting plate, the two ends of the bottom of the mounting plate are fixedly connected with sliding bases respectively, the sliding bases are slidably connected with the sliding rails, and the center of the mounting plate is rotationally sleeved with a rotating cylinder. A rotating assembly fixedly sleeves the bottom of the rotating cylinder and is movably arranged at the bottom of the mounting plate; a half-threaded rod is slidably sleeved with the rotating cylinder, one end of the half-threaded rod is fixedly connected with a supporting plate, and an angle adjusting assembly is movably arranged at the top of the supporting plate. A hydraulic cylinder is fixedly mounted at one end of the top of the bottom frame, a driving end of the hydraulic cylinder is fixedly connected with a mounting seat, four corners of the mounting seat are slidably sleeved with sliding rods, one ends of the sliding rods are fixedly connected with collision blocks, and the centers of the ends, close to the mounting seat, of the collision blocks are fixedly connected with movable columns; a cylindrical groove is concavely formed in the center of the end, close to the collision block, of the mounting base, and a pressure sensor is fixedly mounted in the cylindrical groove.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle testing, in particular to a collision testing device for a vehicle floor. Background Art

[0002] With the increasing popularity of automobiles, consumers are increasingly concerned about the safety performance of automobiles. With the popularization of electric vehicles, the safety performance requirements for battery packs are getting higher and higher. The location of the battery pack of an electric vehicle is usually at the bottom of the vehicle. In order to further improve the safety of the battery pack, a bottom plate is generally installed at the bottom of the chassis to protect the battery pack. Most of the existing collision tests are collision tests for battery packs. For example, a battery pack bottom collision test evaluation method, system and equipment disclosed in Chinese patent application number CN202310999933.5, which relates to the technical field of battery pack collision test, comprises: constructing a battery pack collision three-dimensional simulation model according to material parameters and size parameters of each component at the bottom of the battery pack to be tested; performing a collision test on the battery pack to be tested based on the benchmark working condition to obtain a measured collision posture; calibrating the battery pack collision three-dimensional simulation model based on the measured collision posture to obtain an optimized battery pack collision three-dimensional simulation model; setting a plurality of standby working conditions, using the optimized battery pack collision three-dimensional simulation model to perform collision simulation under any standby working condition, and recording the simulation results; determining the collision safety performance of the battery pack to be tested based on the simulation results corresponding to different standby working conditions.

[0003] In the existing collision test, there is a lack of collision test equipment for the vehicle floor, and thus the safety performance of the floor cannot be verified. Therefore, we propose a collision test equipment for the vehicle floor to solve the above problem. Summary of the invention

[0004] The object of the present invention is to provide a collision test device for a vehicle floor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a collision test device for a vehicle floor, comprising a chassis, two sides of the top of the chassis are respectively fixedly mounted with slide rails, a traction machine is arranged between the slide rails, a mounting plate is connected to the top of the traction machine, two ends of the bottom of the mounting plate are respectively fixedly connected with slide seats, the slide seats are slidably connected with the slide rails, the center of the mounting plate is rotatably sleeved with a rotating cylinder, the bottom of the rotating cylinder is fixedly sleeved with a rotating assembly, and the rotating assembly is movably arranged at the bottom of the mounting plate;

[0006] A semi-threaded rod is slidably sleeved in the rotating cylinder, one end of the semi-threaded rod is fixedly connected to a support plate, and an angle adjustment component is movably provided on the top of the support plate;

[0007] A hydraulic cylinder is fixedly installed at one end of the top of the base frame, and the driving end of the hydraulic cylinder is fixedly connected to the mounting seat. The four corners of the mounting seat are slidably sleeved with sliding rods, and one end of the sliding rods is fixedly connected to a collision block. The center of the collision block close to the mounting seat is fixedly connected to a movable column. The center of the end of the mounting seat close to the collision block is concavely provided with a cylindrical groove, and a pressure sensor is fixedly installed in the cylindrical groove, and the movable column is slidably sleeved in cooperation with the cylindrical groove.

[0008] Preferably, the slide rails are arranged parallel to each other, and one end of the slide rod away from the collision block is connected to a limiting cap through a threaded structure, and the outer diameter of the limiting cap is larger than the outer diameter of the slide rod.

[0009] Preferably, a rectangular opening is formed at one end of the support plate close to the hydraulic cylinder, and reinforcing blocks are fixedly mounted at the corners at both ends of one side of the rectangular opening.

[0010] Preferably, a mounting groove is concavely provided at one end of the support plate away from the hydraulic cylinder.

[0011] Preferably, the angle adjustment assembly includes a slide groove, a screw rod, a transmission seat, a support bar, a support connecting rod, and a hinge seat. Two parallel slide grooves are provided. The two slide grooves are respectively recessed at the two ends of the top of the support plate. Screw rods are rotatably installed in the two slide grooves. The screw rods are respectively connected to the transmission seat through threaded structures. The top of the transmission seat is respectively hinged to one side end of the support bar, and the other side of the support bar is respectively hinged to one end of the support connecting rod, and the other end of the support connecting rod is respectively hinged to the two ends of the hinge seat, and the hinge seat is fixedly connected to the top end of the installation groove.

[0012] Preferably, the angle adjustment assembly also includes a mounting block and a servo motor, the mounting block is provided with at least four opposite ends of fixedly connected support bars that are symmetrical in pairs, the servo motor is fixedly installed in the mounting groove, and the servo motor is connected to the ends of the two screw rods through a chain transmission mechanism.

[0013] Preferably, the support bars are arranged in parallel, and the support connecting rods are of a type structure and are arranged symmetrically with each other.

[0014] Preferably, the rotating assembly includes a handwheel, a worm gear, a worm, an adjusting shaft, and a mounting frame. The worm gear is fixedly connected to the rotating cylinder, one side of the worm gear is meshed and connected to the worm, the worm is fixedly connected to the adjusting shaft, both sides of the adjusting shaft are respectively rotatably connected to the mounting frame, the mounting frame is fixedly connected to the bottom end of the mounting plate, and one end of the adjusting shaft is fixedly connected to the handwheel.

[0015] Preferably, the worm gear, the semi-threaded rod and the rotating cylinder are coaxially arranged.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the inclination angle of the vehicle floor can be adjusted through the angle adjustment component, and then the collision of the floor in the horizontal direction or the vertical direction can be tested, thereby improving the comprehensiveness of the test; the rotating component drives the support plate to rotate in a circle, and the support plate in turn drives the vehicle floor to rotate in a circle, thereby performing collision tests on different surfaces of the vehicle floor, further improving the comprehensiveness of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention;

[0019] Figure 3 This is a schematic diagram of the support plate position structure in the present invention;

[0020] Figure 4 This is a schematic diagram of the support plate position in the present invention when viewed from above;

[0021] Figure 5 This is a schematic diagram of the vehicle floor horizontal angle test structure of the present invention;

[0022] Figure 6 It is a schematic diagram of the vehicle floor vertical angle test structure of the present invention.

[0023] In the figure: base frame 1, slide rail 2, traction machine 3, slide seat 4, support plate 5, rectangular opening 51, reinforcement block 52, mounting groove 53, semi-threaded rod 54, angle adjustment component 6, slide groove 61, screw rod 62, transmission seat 63, support bar 64, mounting block 65, supporting connecting rod 66, hinge seat 67, servo motor 68, hydraulic cylinder 7, mounting seat 8, collision block 9, slide rod 10, limit cap 101, movable column 11, mounting plate 12, rotating component 13, hand wheel 131, worm gear 132, worm 133, adjusting shaft 134, mounting frame 135, rotating cylinder 14. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe 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.

[0025] Example 1

[0026] Reference Figure 1 , 2, which is the first embodiment of the present invention, provides a collision test device for a vehicle floor, including a chassis 1, two sides of the top of the chassis 1 are respectively fixedly mounted with slide rails 2, a traction machine 3 is arranged between the slide rails 2, a mounting plate 12 is connected to the top of the traction machine 3, two ends of the bottom of the mounting plate 12 are respectively fixedly connected with slide seats 4, the slide seats 4 are slidably connected with the slide rails 2, the center of the mounting plate 12 is rotatably sleeved with a rotating cylinder 14, the bottom of the rotating cylinder 14 is fixedly sleeved with a rotating assembly 13, and the rotating assembly 13 is movably arranged at the bottom of the mounting plate 12;

[0027] The semi-threaded rod 54 is slidably sleeved in the rotating cylinder 14, one end of the semi-threaded rod 54 is fixedly connected to the support plate 5, and the top of the support plate 5 is movably provided with an angle adjustment component 6. The semi-threaded rod 54 cooperates with a nut so that the semi-threaded rod 54 is fixedly sleeved in the rotating cylinder 14. By removing the fixed nut, the semi-threaded rod 54 can be extracted from the rotating cylinder 14, and then the support plate 5 can be disassembled and replaced, which is convenient for replacing support plates 5 of different sizes;

[0028] A hydraulic cylinder 7 is fixedly installed at one end of the top of the base frame 1, and the driving end of the hydraulic cylinder 7 is fixedly connected to the mounting seat 8. The four corners of the mounting seat 8 are respectively slidably sleeved with sliding rods 10, and one end of the sliding rods 10 is fixedly connected to a collision block 9. The center of the collision block 9 close to the mounting seat 8 is fixedly connected to a movable column 11. The center of the end of the mounting seat 8 close to the collision block 9 is concavely provided with a cylindrical groove, and a pressure sensor is fixedly installed in the cylindrical groove, and the movable column 11 is slidably sleeved in cooperation with the cylindrical groove.

[0029] During the collision test, the vehicle floor to be tested is fixedly mounted on the mounting block 65 of the angle adjustment assembly 6 with bolts. When a horizontal collision test of the vehicle floor is required, the angle adjustment assembly 6 works to drive the vehicle floor to a horizontal state. Then, according to the height position of the vehicle floor, the hydraulic cylinder 7 works to drive the mounting seat 8 to rise and fall, and the mounting seat 8 then drives the collision block 9 to rise and fall synchronously. When the collision block 9 rises and falls to a collision height matching the vehicle floor, it stops. Then the tractor 3 works to drive the mounting plate 12 to move, and the mounting plate 12 drives the support plate 5 to move synchronously. The support plate 5 cooperates with the angle adjustment assembly 6 to drive the vehicle floor to move toward the collision block 9. Finally, the vehicle floor collides with the collision block 9, and the impact force of the collision acts A collision block 9 is used, and the collision block 9 moves toward the mounting seat 8. The collision block 9 drives the fixed movable column 11 to move. The movable column 11 cooperates with the pressure sensor fixedly installed in the mounting seat 8 to monitor the collision value. When it is necessary to perform a collision test on different sides of the vehicle floor, the rotating component 13 is operated, and the rotating component 13 drives the support plate 5 to rotate in a circle to realize collision detection on different sides of the vehicle floor; when the vehicle floor needs to be detected vertically, the angle adjustment component 6 works to drive the vehicle floor into a vertical structure, and then the hydraulic cylinder 7 is lifted, driving the fixed mounting seat 8 to be lifted, and the mounting seat 8 drives the collision block 9 to be lifted to the collision height, and finally the traction machine 3 works to perform a collision test on the vehicle floor in a vertical state.

[0030] Example 2

[0031] Reference Figure 1-6 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. Specifically, the slide rails 2 are arranged in parallel with each other, and the end of the slide rod 10 away from the collision block 9 is connected to the limiting cap 101 through a threaded structure. The outer diameter of the limiting cap 101 is larger than the outer diameter of the slide rod 10. The slide rod 10 is limited by the limiting cap 101 to prevent the slide rod 10 from detaching. By removing the limiting cap 101, the slide rod 10 can be pulled out, thereby facilitating the disassembly and replacement of the collision block 9.

[0032] Specifically, a rectangular opening 51 is opened at one end of the support plate 5 close to the hydraulic cylinder 7. The setting of the rectangular opening 51 provides a moving space for the collision block 9. Reinforcement blocks 52 are fixedly installed at the corners at both ends of one side of the rectangular opening 51. The setting of the reinforcement blocks 52 improves the strength of the support plate 5 at the position of the rectangular opening 51.

[0033] Specifically, a mounting groove 53 is recessed at one end of the support plate 5 away from the hydraulic cylinder 7 . The arrangement of the mounting groove 53 facilitates the installation of the angle adjustment assembly 6 .

[0034] Specifically, the angle adjustment component 6 includes a slide groove 61, a screw rod 62, a transmission seat 63, a support bar 64, a support connecting rod 66, and a hinge seat 67. Two parallel slide grooves 61 are provided. The two slide grooves 61 are respectively recessed at the two ends of the top of the support plate 5. The screw rods 62 are rotatably installed in the two slide grooves 61. The screw rods 62 are respectively connected to the transmission seat 63 through a threaded structure. The top of the transmission seat 63 is respectively hinged to the end of one side of the support bar 64, and the other side of the support bar 64 is respectively hinged to one end of the support connecting rod 66. The other end of the support connecting rod 66 is respectively hinged to the two ends of the hinge seat 67, and the hinge seat 67 is fixedly connected to the top end of the installation groove 53.

[0035] Furthermore, the angle adjustment assembly 6 also includes a mounting block 65 and a servo motor 68. The mounting block 65 is provided with at least four and two symmetrical fixed connection support bars 64 at opposite ends. The servo motor 68 is fixedly installed in the mounting groove 53. The servo motor 68 is connected to the ends of the two screw rods 62 through a chain transmission mechanism.

[0036] Specifically, the support bars 64 are arranged in parallel, and the support connecting rods 66 are L-shaped structures and are arranged symmetrically with each other.

[0037] When a horizontal collision test of the vehicle floor is required, the servo motor 68 of the angle adjustment assembly 6 is powered on, and the servo motor 68 drives the screw rod 62 to rotate synchronously through the chain transmission mechanism. The screw rod 62 drives the transmission seat 63 to slide in the slide groove 61 through the threaded structure, and the transmission seat 63 drives the hinged support bar 64 to move. The support bar 64 cooperates with the hinged support connecting rod 66 to swing during movement, and then the support bar 64 finally forms a horizontal structure. At the same time, the support connecting rod 66 supports and limits the support bar 64. At this time, the vehicle floor is as follows Figure 5 When the vehicle floor needs to be vertically inspected, the servo motor 68 is powered on, the transmission drives the screw rod 62 to rotate synchronously, the screw rod 62 drives the transmission seat 63 to move, the transmission seat 63 drives the hinged support bar 64 to move, the support bar 64 cooperates with the hinged support link 66, and the support bar 64 is finally formed as shown in FIG. Figure 6 The vertical structure shown in the figure drives the fixed vehicle floor to a vertical state, thereby realizing collision tests of the vehicle floor in different directions.

[0038] Specifically, the rotating assembly 13 includes a handwheel 131, a worm gear 132, a worm 133, an adjusting shaft 134, and a mounting bracket 135. The worm gear 132 is fixedly sleeved on the rotating cylinder 14. One side of the worm gear 132 is meshedly connected to the worm 133. The worm 133 is fixedly sleeved on the adjusting shaft 134. Both sides of the adjusting shaft 134 are rotatably connected to the mounting bracket 135 respectively. The mounting bracket 135 is fixedly connected to the bottom end of the mounting plate 12. One end of the adjusting shaft 134 is fixedly connected to the handwheel 131.

[0039] Specifically, the worm wheel 132, the semi-threaded rod 54 and the rotating cylinder 14 are coaxially arranged. When it is necessary to perform a collision test on different sides of the vehicle floor, by operating the rotating assembly 13, the hand wheel 131 of the rotating assembly 13 rotates, the hand wheel 131 drives the fixed adjustment shaft 134 to rotate, the adjustment shaft 134 drives the fixed worm 133 to rotate, the worm 133 drives the meshing worm wheel 132 to rotate, the worm wheel 132 drives the fixed rotating cylinder 14 to rotate, the rotating cylinder 14 then drives the semi-threaded rod 54 fixedly installed inside to rotate synchronously, and then drives the support plate 5 fixed to the semi-threaded rod 54 to rotate in a circle, so as to realize the collision test on different sides of the vehicle floor.

[0040] Example 3

[0041] Reference Figure 1-6 , which is the third embodiment of the present invention. This embodiment is based on the above two embodiments. During the collision test, the vehicle floor to be tested is fixedly mounted on the mounting block 65 of the angle adjustment assembly 6 with the matching bolts. When the vehicle floor needs to be subjected to a horizontal collision test, the servo motor 68 of the angle adjustment assembly 6 is powered on. The servo motor 68 drives the screw rod 62 to rotate synchronously through the chain transmission mechanism. The screw rod 62 drives the transmission seat 63 to slide in the slide groove 61 through the threaded structure. The transmission seat 63 drives the hinged support bar 64 to move. The support bar 64 cooperates with the hinged support connecting rod 66 to swing during movement, so that the support bar 64 finally forms a horizontal structure. At the same time, the support connecting rod 66 supports and limits the support bar 64. At this time, the vehicle floor is as follows Figure 5As shown in the figure, it is in a horizontal state, and then according to the height position of the vehicle floor, the hydraulic cylinder 7 works, the hydraulic cylinder 7 drives the mounting seat 8 to rise and fall, and the mounting seat 8 further drives the collision block 9 to rise and fall synchronously. When the collision block 9 rises and falls to match the collision height of the vehicle floor, it stops, and then the tractor 3 works, the tractor 3 drives the mounting plate 12 to move, the mounting plate 12 drives the support plate 5 to move synchronously, and the support plate 5 cooperates with the angle adjustment component 6 to drive the vehicle floor to move toward the collision block 9. Finally, the vehicle floor collides with the collision block 9, and the impact force of the collision acts on the collision block 9, and the collision block 9 moves toward the mounting seat 8. The collision block 9 drives the fixed movable column 11 to move, and the movable column 11 cooperates with the pressure sensor fixedly installed in the mounting seat 8 to monitor the collision value. When it is necessary to perform a collision test on different sides of the vehicle floor, by operating The rotating assembly 13, the handwheel 131 of the rotating assembly 13 rotates, the handwheel 131 drives the fixed adjusting shaft 134 to rotate, the adjusting shaft 134 drives the fixed worm 133 to rotate, the worm 133 drives the meshing worm wheel 132 to rotate, the worm wheel 132 drives the fixed rotating cylinder 14 to rotate, the rotating cylinder 14 then drives the semi-threaded rod 54 fixedly installed inside to rotate synchronously, and then drives the support plate 5 fixed to the semi-threaded rod 54 to rotate in a circle, so as to realize the collision detection of different sides of the vehicle floor; when the vehicle floor needs to be detected vertically, the servo motor 68 is energized to work, the transmission drives the lead screw 62 to rotate synchronously, the lead screw 62 drives the transmission seat 63 to move, the transmission seat 63 drives the hinged support bar 64 to move, the support bar 64 cooperates with the hinged support connecting rod 66, and the support bar 64 is finally formed as follows Figure 6 The vertical structure shown in the figure drives the fixed vehicle floor into a vertical state, and then the hydraulic cylinder 7 is lifted, driving the fixed mounting seat 8 to be lifted, and the mounting seat 8 drives the collision block 9 to be lifted to the collision height, and finally the tractor 3 works to perform a collision test on the vehicle floor in a vertical state.

[0042] 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. A vehicle floor collision test device, comprising a chassis (1), characterized in that: Slide rails (2) are fixedly mounted on both sides of the top of the base frame (1), a traction machine (3) is arranged between the slide rails (2), a mounting plate (12) is connected to the top of the traction machine (3), the two ends of the bottom of the mounting plate (12) are fixedly connected to the slide seats (4), the slide seats (4) are slidably connected to the slide rails (2), the center of the mounting plate (12) is rotatably sleeved on the rotating cylinder (14), the bottom of the rotating cylinder (14) is fixedly sleeved on the rotating assembly (13), and the rotating assembly (13) is movably arranged on the bottom of the mounting plate (12); A semi-threaded rod (54) is slidably sleeved in the rotating cylinder (14), one end of the semi-threaded rod (54) is fixedly connected to a support plate (5), and an angle adjustment component (6) is movably provided on the top of the support plate (5); A hydraulic cylinder (7) is fixedly installed at one end of the top of the base frame (1), and the driving end of the hydraulic cylinder (7) is fixedly connected to the mounting seat (8). The four corners of the mounting seat (8) are respectively slidably sleeved with sliding rods (10), and one end of the sliding rod (10) is fixedly connected to a collision block (9). The center of one end of the collision block (9) close to the mounting seat (8) is fixedly connected to a movable column (11). The center of one end of the mounting seat (8) close to the collision block (9) is concavely provided with a cylindrical groove, and a pressure sensor is fixedly installed in the cylindrical groove. The movable column (11) is slidably sleeved and matched with the cylindrical groove.

2. A vehicle floor collision test device according to claim 1, characterized in that: The slide rails (2) are arranged parallel to each other, and one end of the slide rod (10) away from the collision block (9) is connected to a limiting cap (101) via a threaded structure, and the outer diameter of the limiting cap (101) is greater than the outer diameter of the slide rod (10).

3. A vehicle floor collision test device according to claim 1, characterized in that: A rectangular opening (51) is provided at one end of the support plate (5) close to the hydraulic cylinder (7), and reinforcing blocks (52) are fixedly mounted at the corners at both ends of one side of the rectangular opening (51).

4. A vehicle floor collision test device according to claim 1, characterized in that: An installation groove (53) is recessed in one end of the support plate (5) away from the hydraulic cylinder (7).

5. A vehicle floor collision test device according to claim 4, characterized in that: The angle adjustment component (6) comprises a slide groove (61), a screw rod (62), a transmission seat (63), a support bar (64), a support connecting rod (66), and an articulated seat (67). Two slide grooves (61) are provided in parallel. The two slide grooves (61) are respectively recessed at the two ends of the top of the support plate (5). The screw rods (62) are rotatably installed in the two slide grooves (61). The screw rods (62) are respectively connected to the transmission seat (63) through threaded structures. The top of the transmission seat (63) is respectively hinged to one end of the support bar (64), and the other side of the support bar (64) is respectively hinged to one end of the support connecting rod (66). The other end of the support connecting rod (66) is respectively hinged to the two ends of the articulated seat (67), and the articulated seat (67) is fixedly connected to one end of the top of the installation groove (53).

6. A vehicle floor collision test device according to claim 5, characterized in that: The angle adjustment assembly (6) further comprises a mounting block (65) and a servo motor (68); the mounting block (65) is provided with at least four opposite ends of the fixedly connected support bars (64) which are symmetrical in pairs; the servo motor (68) is fixedly mounted in the mounting groove (53); and the servo motor (68) is connected to the ends of the two screw rods (62) via a chain transmission mechanism.

7. A vehicle floor collision test device according to claim 6, characterized in that: The support bars (64) are arranged in parallel, and the support connecting rods (66) are L-shaped structures and are arranged symmetrically with each other.

8. The vehicle floor collision test device according to claim 1, characterized in that: The rotating assembly (13) comprises a hand wheel (131), a worm wheel (132), a worm (133), an adjusting shaft (134), and a mounting frame (135); the worm wheel (132) is fixedly sleeved on the rotating cylinder (14); one side of the worm wheel (132) is meshingly connected to the worm (133); the worm (133) is fixedly sleeved on the adjusting shaft (134); two sides of the adjusting shaft (134) are rotatably connected to the mounting frame (135) respectively; the mounting frame (135) is fixedly connected to the bottom end of the mounting plate (12); and one end of the adjusting shaft (134) is fixedly connected to the hand wheel (131).

9. A vehicle floor collision test device according to claim 8, characterized in that: The worm wheel (132), the semi-threaded rod (54) and the rotating cylinder (14) are coaxially arranged.

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