Multi-angle adjusting clamp for reliability test of tea-leaf picker

Abstract

The invention discloses a multi-angle adjusting clamp for a reliability test of a tea-leaf picker, and relates to the technical field of agricultural machinery tests.The multi-angle adjusting clamp comprises a fixed base, one side of the upper end of the fixed base is fixedly connected with a fixed frame, and the other side of the upper end of the fixed base is connected with a movable frame in a front-back sliding mode; a main grab handle suspension electric telescopic rod is fixedly connected to the inner top of the fixed frame, an auxiliary grab handle suspension electric telescopic rod is connected to the inner top wall of the movable frame in a left-right sliding mode, and movable rods of the main grab handle suspension electric telescopic rod and the auxiliary grab handle suspension electric telescopic rod are both downwards provided with clamping seats. The fixing and vibration reduction requirements of the tea-leaf picker of multiple models are met, and the scene of real hand holding operation is simulated, so that the detection operation of the tea-leaf picker is more in line with the actual use scene, and the authenticity of the reliability test of the tea-leaf picker is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery testing, and particularly relates to a multi-angle adjustable fixture for the reliability test of a tea picking machine. Background Art

[0002] A tea picking machine is a commonly used tool in agricultural production for pruning the new shoots of tea trees and picking tea leaves. With the development of agricultural mechanization, portable tea picking machines have gradually become popular, but the reliability test thereof has not yet formed a mature technical means.

[0003] In the prior art, in order to test the reliability of a tea picking machine, a reliability test device was designed, which requires the tea picking machine to continuously work for a long time and continuously output a fiber bundle simulating a tea stalk to the tea picking machine for cutting, so as to simulate the real working environment of the tea picking machine and test its reliability. During the test process, the tea picking machine will generate intense vibrations during operation. The fixture needs to provide a strong fixing function to firmly fix the tea picking machine on the reliability test device to avoid deviation or loosening caused by vibrations. At the same time, when a tea farmer uses a tea picking machine, the holding angle may be adjusted according to the operation requirements. And due to the non-uniformity of the external shapes and specifications of tea picking machines from different manufacturers and of different specifications on the market, the distance and angle between the two handles of the tea picking machine vary depending on the model, and the existing clamping tools are difficult to adapt to tea picking machines of different models. Therefore, the tea picking machine fixture needs to be adjustable to different angles during the reliability test to simulate various real working conditions. For this reason, the present invention provides a multi-angle adjustable fixture for the reliability test of a tea picking machine. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that, due to the non-uniformity of the external shapes and specifications of tea picking machines from different manufacturers and of different specifications on the market, and the fact that the distance and angle between the two handles of the tea picking machine vary depending on the model, the existing clamping tools are difficult to adapt to tea picking machines of different models. The present invention provides a multi-angle adjustable fixture for the reliability test of a tea picking machine.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] A multi-angle adjustable fixture for the reliability test of a tea picking machine, comprising a fixed base, one side of the upper end of the fixed base is fixedly connected with a fixed frame, and the other side of the upper end of the fixed base is slidably connected with a movable frame in the front and rear directions. The inner top of the fixed frame is fixedly connected with a main handle suspension electric telescopic rod, and the inner top wall of the movable frame is slidably connected with an auxiliary handle suspension electric telescopic rod in the left and right directions. The movable rods of the main handle suspension electric telescopic rod and the auxiliary handle suspension electric telescopic rod are both installed downward with clamping seats, and the bottom of the clamping seat is fixedly connected with a fixed clamping plate. The bottom of the movable rod of the main handle suspension electric telescopic rod is fixedly connected with the upper end of the clamping seat, and the bottom of the movable rod of the auxiliary handle suspension electric telescopic rod is rotatably connected with the upper end of the clamping seat.

[0007] Furthermore, connecting screws are fixedly connected to the four corners of the upper end of the fixed clamping plate, and the connecting screws penetrate upward through the clamping seat and are threadedly connected with butterfly nuts.

[0008] Furthermore, semi-circular grooves are formed at the centers of the opposite sides of the clamping seat and the fixed clamping plate, and buffer rubber pads are fixedly connected in the semi-circular grooves.

[0009] Furthermore, buffer rubber columns are symmetrically distributed on both sides of the outer wall of each buffer rubber pad on the clamping seat and the fixed clamping plate, and the four buffer rubber columns are evenly distributed on the circumference formed by the two semi-circular grooves. Fixed slots are formed in the inner walls of the semi-circular grooves of the clamping seat and the fixed clamping plate corresponding to the buffer rubber columns. The outer ends of the buffer rubber columns are fixedly connected to the bottom of the fixed slots. Buffer oil is filled in the centers of the buffer rubber columns, and a gap is left between the outer walls of the buffer rubber columns and the inner walls of the fixed slots.

[0010] Furthermore, a rotating sleeve is rotatably sleeved at the bottom of the auxiliary handle suspension electric telescopic rod. Ball bearings are installed between the upper and lower inner walls of the rotating sleeve and the auxiliary handle suspension electric telescopic rod. A rotating positioning screw is threadedly connected to the middle of the rotating sleeve. An annular friction pad is arranged at the position corresponding to the middle of the rotating sleeve on the outer wall of the auxiliary handle suspension electric telescopic rod, and the inner end of the rotating positioning screw penetrates through the rotating sleeve and abuts against the annular friction pad.

[0011] Furthermore, a T-shaped sliding groove is formed in the upper side of the moving frame corresponding to the upper end of the auxiliary handle suspension electric telescopic rod, and a T-shaped sliding block is slidably connected in the T-shaped sliding groove. The upper end of the rod sleeve of the auxiliary handle suspension electric telescopic rod is fixedly connected to the bottom of the T-shaped sliding block. A lead screw nut is arranged at the upper end of the T-shaped sliding block. An adjusting lead screw is rotatably installed on both sides of the T-shaped sliding groove on the upper side of the moving frame through bearing seats, and the adjusting lead screw cooperates with the lead screw nut at the upper end of the T-shaped sliding block. One end of the adjusting lead screw penetrates through the bearing seat and is fixedly connected to a lead screw rotating wheel.

[0012] Furthermore, a sliding base is fixedly connected to the bottom of the moving frame, and two parallel T-shaped guide rails are fixedly connected to the upper end of the fixed base corresponding to the bottom of the sliding base. The bottom of the sliding base is slidably sleeved on the T-shaped guide rails, and the bottom of the sliding base extends outward. A positioning screw is threadedly connected to the outer end upper side of the sliding base, and the bottom of the positioning screw penetrates through the sliding base and abuts against the upper side of the outer T-shaped guide rail.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention uses a clamping fixture with two pairs of clamping seats and fixed clamping plates to imitate the operation of an operator's two hands respectively clamping and fixing the two handles of a tea picking machine. Through the fixed connection between the main handle suspension electric telescopic rod and the clamping seat by suspending the main handle, the main handle of the tea picking machine is ensured to be firmly clamped. By moving the moving frame back and forth, the front and rear positions of the auxiliary handle suspension electric telescopic rod can be adjusted, so as to be applicable to the fixation of the auxiliary handle horizontally placed on the picking head of a tea picking machine with different front and rear positions of the auxiliary handle. Through the left and right movement setting of the auxiliary handle suspension electric telescopic rod, it is applicable to the fixation of a tea picking machine with the same distance between the auxiliary handle and the main handle. Through the rotational cooperation between the auxiliary handle suspension electric telescopic rod and the clamping seat, the clamping mechanism at the bottom of the auxiliary handle suspension electric telescopic rod can be adapted to the gripping angle of the handle of tea pruning machines of different specifications and models. Through the telescopic adjustment of the main handle suspension electric telescopic rod and the auxiliary handle suspension electric telescopic rod, the clamping height of the tea picking machine can be adjusted. The separate telescopic adjustment of the main handle suspension electric telescopic rod and the auxiliary handle suspension electric telescopic rod can be applicable to the fixation of tea pruning machines with different inclination angles, so that the tea picking machine is fixed at the test position corresponding to the reliability test equipment. This multi-angle adjustment fixture can be applicable to the clamping and fixation of tea picking machines of different specifications, meet the fixation and vibration reduction requirements of multi-model tea picking machines, and simulate the scenario of real human hand gripping operation, making the operation of detecting the tea picking machine more in line with the actual use scenario, thereby ensuring the authenticity of the reliability test of the tea picking machine.

[0015] 2. The present invention is provided with a semi-circular groove, which is convenient for clamping a cylindrical handle. Through the provided buffer rubber pad, the buffer rubber pad increases the contact area between the clamping seat and the fixed clamping plate and the handle, improves the clamping firmness, and can provide a vibration reduction effect, reducing the influence of the high-frequency vibration of the tea pruning machine on the clamping stability.

[0016] 3. The present invention is provided with a rotating sleeve, which can rotatably install the clamping seat at the bottom of the auxiliary handle suspension electric telescopic rod. Through the provided rotating positioning screw, the thread tightening of the rotating positioning screw can frictionally fix with the outer wall of the auxiliary handle suspension electric telescopic rod, thereby switching the rotation and fixation of the rotating sleeve and the auxiliary handle suspension electric telescopic rod, and facilitating the adjustment of the inclination angle of the clamping seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional view of the present invention;

[0018] Figure 2 is a rear-view cross-sectional view of the present invention;

[0019] Figure 3 is a side cross-sectional view of the present invention;

[0020] Figure 4 is an internal structural diagram of the connection between the auxiliary handle suspension electric telescopic rod and the clamping seat of the present invention.

[0021] Figure numerals: 1. Fixed base; 2. Fixed frame; 3. Main handle for suspending electric telescopic rod; 4. Auxiliary handle for suspending electric telescopic rod; 5. Clamping seat; 6. Fixed splint; 7. Rotating sleeve; 8. Rotating positioning screw; 9. Buffer rubber pad; 10. Buffer rubber column; 11. Connecting screw; 12. Butterfly nut; 13. Moving frame; 14. Sliding base; 15. T-shaped guide rail; 16. Positioning screw; 17. T-shaped slide groove; 18. T-shaped slider; 19. Adjusting screw; 20. Screw wheel. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] See also Figures 1-4 The present invention provides a multi-angle adjustment fixture for reliability test of a tea plucking machine, comprising a fixed base 1, a fixed frame 2 is fixedly connected to one side of the upper end of the fixed base 1, and a moving frame 13 is slidably connected to the other side of the upper end of the fixed base 1, a main grip suspension electric telescopic rod 3 is fixedly connected to the top of the fixed frame 2, and an auxiliary grip suspension electric telescopic rod 4 is slidably connected to the top wall of the moving frame 13, the movable rods of the main grip suspension electric telescopic rod 3 and the auxiliary grip suspension electric telescopic rod 4 are both downwardly installed with a clamping seat 5, and the bottom of the clamping seat 5 is fixedly connected to a fixed clamping plate 6, the bottom of the movable rod of the main grip suspension electric telescopic rod 3 is fixedly connected to the upper end of the clamping seat 5, and the bottom of the movable rod of the auxiliary grip suspension electric telescopic rod 4 is rotatably connected to the upper end of the clamping seat 5.

[0024] In this embodiment, preferably, the four corners of the upper end of the fixed splint 6 are fixedly connected with connecting screws 11, and the connecting screws 11 are upwardly penetrated through the clamping seat 5 and then threadedly connected with butterfly nuts 12; by setting the connecting screws 11 and butterfly nuts 12, the threads of the connecting screws 11 and the butterfly nuts 12 are matched and tightened to pull the clamping seat 5 and the fixed splint 6 closer, so as to complete the grip of the handle of the tea picking machine, and can be suitable for the clamping and fixation of handles of different sizes. The setting of the butterfly nut 12 facilitates manual operation.

[0025] In the present embodiment, preferably, semicircular grooves are provided at the centers of opposite sides of the clamping seat 5 and the fixed splint 6, and buffer rubber pads 9 are fixedly connected in the semicircular grooves; the semicircular grooves are provided to facilitate clamping of the cylindrical handle, and the buffer rubber pads 9 are provided to increase the contact area between the clamping seat 5 and the fixed splint 6 and the handle, thereby improving the clamping firmness, and can provide a vibration reduction effect, thereby reducing the influence of the high-frequency vibration of the tea picking machine on the clamping stability.

[0026] In this embodiment, preferably, on both sides of the outer wall of each buffer rubber pad 9 on the clamping seat 5 and the fixed clamping plate 6, buffer rubber columns 10 are symmetrically distributed, and the four buffer rubber columns 10 are evenly distributed on the circumference formed by two semi-circular grooves. Fixed slots are provided on the inner walls of the semi-circular grooves of the clamping seat 5 and the fixed clamping plate 6 corresponding to the buffer rubber columns 10. The outer ends of the buffer rubber columns 10 are fixedly connected to the bottom of the fixed slots. Buffer oil is filled in the center of the buffer rubber columns 10, and a gap is left between the outer wall of the buffer rubber columns 10 and the inner wall of the fixed slots. Buffer oil is filled in the center of the buffer rubber columns 10. Through the two pairs of buffer rubber columns 10 provided, the two pairs of buffer rubber columns 10 can adapt to vibration reduction through the elastic deformation of the buffer rubber columns 10 when the handle in the center of the clamping seat 5 and the fixed clamping plate 6 vibrates, improving the buffer effect of the clamping seat 5 and the fixed clamping plate 6. The fixed slots are used to fix the buffer rubber columns 10 and at the same time leave space for the deformation of the buffer rubber columns 10.

[0027] In this embodiment, preferably, a rotating sleeve 7 is rotatably sleeved at the bottom of the auxiliary handle suspension electric telescopic rod 4. Ball bearings are installed between the upper and lower inner walls of the rotating sleeve 7 and the auxiliary handle suspension electric telescopic rod 4. A rotating positioning screw 8 is threadedly connected to the middle of the rotating sleeve 7. An annular friction pad is provided on the outer wall of the auxiliary handle suspension electric telescopic rod 4 corresponding to the middle of the rotating sleeve 7. The inner end of the rotating positioning screw 8 passes through the rotating sleeve 7 and abuts against the annular friction pad. Through the rotating sleeve 7 provided, the clamping seat 5 can be rotatably installed at the bottom of the auxiliary handle suspension electric telescopic rod 4. Through the rotating positioning screw 8 provided, the threaded tightening of the rotating positioning screw 8 can friction-fix with the annular friction pad on the outer wall of the auxiliary handle suspension electric telescopic rod 4, so as to switch the rotation and fixation of the rotating sleeve 7 and the auxiliary handle suspension electric telescopic rod 4, facilitating the adjustment of the inclination angle of the clamping seat 5.

[0028] In this embodiment, preferably, a T-shaped sliding groove 17 is provided on the upper side of the moving frame 13 corresponding to the upper end of the auxiliary handle suspension electric telescopic rod 4. A T-shaped sliding block 18 is slidably connected in the T-shaped sliding groove 17. The upper end of the rod sleeve of the auxiliary handle suspension electric telescopic rod 4 is fixedly connected to the bottom of the T-shaped sliding block 18. A lead screw nut is provided at the upper end of the T-shaped sliding block 18. An adjusting lead screw 19 is rotatably installed on both sides of the T-shaped sliding groove 17 on the upper side of the moving frame 13 through bearing seats. The adjusting lead screw 19 is matched with the lead screw nut at the upper end of the T-shaped sliding block 18. One end of the adjusting lead screw 19 passes through the bearing seat and is fixedly connected to a lead screw rotating wheel 20. Through the T-shaped sliding groove 17 and the T-shaped sliding block 18 provided, the auxiliary handle suspension electric telescopic rod 4 can slide left and right in the T-shaped sliding groove 17 through the T-shaped sliding block 18. Through the adjusting lead screw 19 provided, the adjusting lead screw 19 drives the T-shaped sliding block 18 to move left and right through the threaded cooperation with the lead screw nut at the upper end of the T-shaped sliding block 18, so as to adjust the left and right position of the auxiliary handle suspension electric telescopic rod 4, facilitating the adjustment of the clamping distance of the auxiliary handle suspension electric telescopic rod 4.

[0029] In this embodiment, preferably, a sliding base 14 is fixedly connected to the bottom of the moving frame 13, and two parallel T-shaped guide rails 15 are fixedly connected to the upper end of the fixed base 1 corresponding to the bottom of the sliding base 14. The bottom of the sliding base 14 is slidably sleeved on the T-shaped guide rails 15, and the bottom of the sliding base 14 extends outward. A positioning screw 16 is threadedly connected to the upper side of the outer end of the sliding base 14, and the bottom of the positioning screw 16 passes through the sliding base 14 and abuts against the upper side of the outer T-shaped guide rail 15. By providing the sliding base 14 and the T-shaped guide rails 15, the sliding base 14 is slidably matched with the two parallel T-shaped guide rails 15, making the front and back sliding of the moving frame 13 more stable. By providing the positioning screw 16, the contact friction between the bottom of the positioning screw 16 and the T-shaped guide rail 15 can position and fix the moving frame 13. When adjusting, the positioning screw 16 can be loosened and tightened, and the sliding base 14 can be released and fixed, facilitating the adjustment of the front and back positions of the moving frame 13. The operation is simple and convenient to use.

[0030] The working principle and usage process of the present invention: When the device is used, through the fixed base 1, the fixed frame 2 and the moving frame 13 provided, the main handle on the fixed frame 2 suspends the electric telescopic rod 3 and the auxiliary handle on the moving frame 13 suspends the electric telescopic rod 4, which can imitate the operation of an operator's arm to suspend and fix the tea picking machine. Then, the reliability test equipment is placed at the center of the upper end of the fixed base 1, and the test fibers output by the reliability test equipment are conveyed towards the working end of the tea picking machine.

[0031] Through the cooperation of two pairs of clamping seats 5 and fixed clamping plates 6, the fixture imitates the two hands of an operator to respectively clamp and fix the two handles of the tea picking machine. Through the fixed connection between the main handle suspension electric telescopic rod 3 and the clamping seat 5, the main handle of the tea picking machine is ensured to be firmly clamped. By moving the moving frame 13 back and forth, the front and back positions of the auxiliary handle suspension electric telescopic rod 4 can be adjusted, so as to be suitable for fixing the auxiliary handle horizontally arranged on the picking head of the tea picking machine with different front and back positions of the auxiliary handle. Through the left and right movement setting of the auxiliary handle suspension electric telescopic rod 4, it is suitable for fixing the tea picking machine with the same distance between the auxiliary handle and the main handle. Through the rotational cooperation between the auxiliary handle suspension electric telescopic rod 4 and the clamping seat 5, the clamping mechanism at the bottom of the auxiliary handle suspension electric telescopic rod 4 can be adapted to the gripping angles of the handles of different specifications and models of tea picking machines. Through the telescopic adjustment of the main handle suspension electric telescopic rod 3 and the auxiliary handle suspension electric telescopic rod 4, the clamping height of the tea picking machine can be adjusted. The separate telescopic adjustment of the main handle suspension electric telescopic rod 3 and the auxiliary handle suspension electric telescopic rod 4 can be suitable for fixing tea pruning machines with different inclination angles, making the tea picking machine fixed at the test position corresponding to the reliability test equipment.

[0032] This multi-angle adjusting fixture can be applied to the clamping and fixing of tea pickers with different specifications, meet the fixing and vibration reduction requirements of multi-model tea pickers, and simulate the scenario of real human hand holding operation, making the operation of testing the tea picker more in line with the actual use scenario, so as to ensure the authenticity of the reliability test of the tea picker.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-angle adjustment fixture for reliability test of tea picking machine, characterized by: The utility model comprises a fixed base (1), wherein one side of the upper end of the fixed base (1) is fixedly connected to a fixed frame (2), and the other side of the upper end of the fixed base (1) is slidably connected to a movable frame (13) in a forward and backward manner, the top of the fixed frame (2) is fixedly connected to a main handle suspension electric telescopic rod (3), and the top wall of the movable frame (13) is slidably connected to an auxiliary handle suspension electric telescopic rod (4) in a left and right manner, the movable rods of the main handle suspension electric telescopic rod (3) and the auxiliary handle suspension electric telescopic rod (4) are both downwardly mounted with a clamping seat (5), and the bottom of the clamping seat (5) is fixedly connected to a fixed clamping plate (6), the bottom of the movable rod of the main handle suspension electric telescopic rod (3) is fixedly connected to the upper end of the clamping seat (5), and the bottom of the movable rod of the auxiliary handle suspension electric telescopic rod (4) is rotatably connected to the upper end of the clamping seat (5).

2. A multi-angle adjustment fixture for reliability test of a tea plucking machine according to claim 1, characterized in that: The four corners of the upper end of the fixed clamping plate (6) are fixedly connected with connecting screws (11), and the connecting screws (11) penetrate the clamping seat (5) upwards and are then threadedly connected with butterfly nuts (12).

3. The multi-angle adjustment fixture for reliability test of tea plucking machine according to claim 1, characterized in that: The clamping seat (5) and the fixed clamping plate (6) are both provided with semicircular grooves at the centers of the opposite sides, and the semicircular grooves are both fixedly connected with buffer rubber pads (9).

4. The multi-angle adjustment fixture for reliability test of tea plucking machine according to claim 3, characterized in that: Buffer rubber columns (10) are symmetrically distributed on both sides of the outer wall of each buffer rubber pad (9) on the clamping seat (5) and the fixed clamping plate (6), and the four buffer rubber columns (10) are evenly distributed on the circumference formed by the two semicircular grooves. The inner walls of the semicircular grooves of the clamping seat (5) and the fixed clamping plate (6) are provided with fixed slots corresponding to the buffer rubber columns (10). The outer ends of the buffer rubber columns (10) are fixedly connected to the bottom of the fixed slots. The center of the buffer rubber columns (10) is filled with buffer oil, and a gap is left between the outer wall of the buffer rubber column (10) and the inner wall of the fixed slot.

5. The multi-angle adjustment fixture for reliability test of tea plucking machine according to claim 1, characterized in that: The bottom of the auxiliary handle suspension electric telescopic rod (4) is rotatably sleeved with a rotating sleeve (7), and ball bearings are installed between the upper and lower inner walls of the rotating sleeve (7) and the auxiliary handle suspension electric telescopic rod (4), and a rotating positioning screw (8) is threadedly connected in the middle of the rotating sleeve (7), and an annular friction pad is arranged on the outer wall of the auxiliary handle suspension electric telescopic rod (4) corresponding to the middle position of the rotating sleeve (7), and the inner end of the rotating positioning screw (8) passes through the rotating sleeve (7) and abuts against the annular friction pad.

6. The multi-angle adjustment fixture for reliability test of tea plucking machine according to claim 1, characterized in that: A T-shaped slot (17) is provided on the upper side of the movable frame (13) corresponding to the upper end of the auxiliary handle suspending the electric telescopic rod (4), and a T-shaped slider (18) is slidably connected in the T-shaped slot (17). The upper end of the rod sleeve of the auxiliary handle suspending the electric telescopic rod (4) is fixedly connected to the bottom of the T-shaped slider (18), and a screw nut is provided on the upper end of the T-shaped slider (18). An adjusting screw (19) is rotatably installed on both sides of the T-shaped slot (17) corresponding to the upper side of the movable frame (13) through a bearing seat, and the adjusting screw (19) cooperates with the screw nut on the upper end of the T-shaped slider (18), and one end of the adjusting screw (19) passes through the bearing seat and is fixedly connected to a screw rotating wheel (20).

7. The multi-angle adjustment fixture for reliability test of tea plucking machine according to claim 1, characterized in that: The bottom of the movable frame (13) is fixedly connected to a sliding base (14), and the upper end of the fixed base (1) is fixedly connected to two parallel T-shaped guide rails (15) corresponding to the bottom of the sliding base (14), the bottom of the sliding base (14) is slidably sleeved on the T-shaped guide rails (15), and the bottom of the sliding base (14) extends outward, and the upper side of the outer end of the sliding base (14) is threadedly connected to a positioning screw (16), and the bottom of the positioning screw (16) passes through the sliding base (14) and abuts against the upper side of the outer T-shaped guide rail (15).

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