Photovoltaic cable research and development intensity detection device

Abstract

The utility model provides a photovoltaic cable research and development strength detection device, which relates to the technical field of tensile strength detection, and comprises four Z-shaped clamping plates which are arranged in pairs and are used for respectively clamping and fixing the head end and the tail end of a cable; u-shaped hanging frames are welded to the positions, close to the two ends of the longitudinal strip-shaped groove, of the bottom side of the test table, and vertical sliding rods are installed on the U-shaped hanging frames and the U-shaped sliding frames in a sliding mode. Two connecting rods are symmetrically and rotationally connected between the bottom ends of the two Z-shaped clamping plates arranged in one group and the top end parts of the vertical sliding rods; and a six-edge driving shaft is fixedly welded to the bottom end part of the vertical sliding rod located below the longitudinal strip-shaped groove. According to the utility model, the two pull rods are matched with the six-edge driving shaft for use, so that the two Z-shaped clamping plates on the left side and the two Z-shaped clamping plates on the right side can be directly or indirectly and synchronously driven to slide oppositely, the head end and the tail end of a cable can be loosened and tightened at one time, and compared with the prior art, the operation and the use are convenient, and the detection operation efficiency of the device can be improved.

Description

Technical Field

[0001] This utility model relates to the field of tensile strength testing technology, and in particular to a strength testing device for photovoltaic cables. Background Technology

[0002] To ensure the quality and reliability of photovoltaic cables, a series of tests are required, especially tensile strength testing during the research and development stage. Photovoltaic cable research and development strength testing equipment is needed when carrying out tensile strength testing.

[0003] Existing tensile strength testing devices require fixing one end of the cable to the testing platform and connecting the other end of the cable to the mechanism that outputs the tensile force during testing. However, the two mechanisms that fix the two ends of the cable often lack a synchronous drive structure, which means that the two cable fixing mechanisms need to be driven step by step before and after the testing operation to tighten or loosen the two ends of the cable. This is cumbersome and inconvenient to operate, reducing the efficiency of the device's testing operation. Summary of the Invention

[0004] In view of this, the present invention provides a photovoltaic cable strength testing device to solve the problem that it is cumbersome and inconvenient to operate the two cable fixing mechanisms step by step before and after the testing operation to tighten or loosen the ends of the cable.

[0005] The technical solution proposed by this utility model is: a photovoltaic cable R&D strength testing device, specifically including: a test platform and a cable, wherein a longitudinal strip groove and a rectangular mounting groove are respectively opened through the middle position of the two short sides of the test platform;

[0006] A hexagonal track shaft is welded into the longitudinal strip groove. Two Z-shaped clamps are symmetrically slidably installed on the hexagonal track shaft by spring push. A longitudinally sliding U-shaped sliding frame is installed inside the rectangular mounting groove. A hexagonal positioning shaft is welded into the top opening of the U-shaped sliding frame. Two Z-shaped clamps are symmetrically slidably installed on the hexagonal positioning shaft by spring push.

[0007] The four Z-shaped clamps are arranged in pairs to clamp and fix the beginning and end ends of the cable respectively; U-shaped hanging frames are welded to the bottom side of the test platform near the two ends of the longitudinal strip groove, and vertical sliding rods are slidably installed on both the U-shaped hanging frames and the U-shaped sliding frames; the bottom ends of the two Z-shaped clamps arranged in a group are symmetrically rotatably connected to the top ends of the vertical sliding rods by two connecting rods; a hexagonal drive shaft is welded and fixed to the bottom end of the vertical sliding rod located below the longitudinal strip groove, and the first end of the hexagonal drive shaft is slidably engaged with the bottom end of the other vertical sliding rod;

[0008] Both the U-shaped hanging frame and the U-shaped sliding frame are equipped with mountain-shaped positioning components that are slidably installed by spring pushing. The two mountain-shaped positioning components support each other and are used to insert and fix the two vertical sliding rods respectively. Both mountain-shaped positioning components are rotatably connected to a pull rod, and the first ends of the two pull rods are rotatably connected together.

[0009] Furthermore,

[0010] Both vertical sliding rods have a row of toothed grooves on opposite sides, and the first end of the insert plate in the middle of the mountain-shaped positioning component has a slanted section structure. The slanted section of the first end of the insert plate of the mountain-shaped positioning component is inserted and matched with a row of toothed grooves.

[0011] Furthermore,

[0012] The hexagonal drive shaft is laterally supported, and an L-shaped step plate is welded to the bottom of the middle section.

[0013] Furthermore,

[0014] The U-shaped sliding frame is vertically supported, and the two vertical sliding rods are connected to the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame and the U-shaped hanging frame through sliding fit;

[0015] The two mountain-shaped positioning components are arranged horizontally, and the two mountain-shaped positioning components slide through and engage with the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame and the U-shaped hanging frame.

[0016] Furthermore,

[0017] The two pull rods are rotatably mounted with drive levers at their ends, and the two pull rods are rotatably connected together by the drive levers.

[0018] The drive lever is supported longitudinally, and its head extends to the bottom of one long side of the test bench.

[0019] Furthermore,

[0020] The rectangular mounting groove has two cross bracing track shafts symmetrically welded to its two short sides, and the U-shaped sliding frame slides in conjunction with the two cross bracing track shafts.

[0021] The top part of the U-shaped hanging frame is welded with a cross bracing U-shaped frame.

[0022] Furthermore,

[0023] The bottom of the two short sides of the test bench is symmetrically welded with two U-shaped ground support frames. The top part of the ground support frame located on one side of the horizontal U-shaped frame is welded with a longitudinal support rod, and the middle part of the longitudinal support rod is welded with a transverse support U-shaped positioning frame.

[0024] A T-shaped slider is slidably mounted on the U-shaped positioning frame, and a tension sensor is threadedly connected between the top part of the T-shaped slider and the first end part of the cross brace U-shaped frame.

[0025] Furthermore,

[0026] The first end of the U-shaped positioning frame is fitted with a motor by bolts. A lead screw is connected to the motor shaft. The first end of the lead screw is rotatably connected to the longitudinal support rod, and the lead screw is screwed through and screwed into the middle part of the bottom side of the T-shaped slider.

[0027] The photovoltaic cable R&D strength testing device provided by this utility model has the following beneficial effects:

[0028] The two pull rods of this invention, used in conjunction with the hexagonal drive shaft, can directly or indirectly drive the two Z-shaped clamps on the left and the two Z-shaped clamps on the right to slide towards each other in one step, thus tightening or loosening the cable ends in one operation. Compared with the prior art, this eliminates the trouble of having to slide the two Z-shaped clamps on the left and the two Z-shaped clamps on the right in opposite steps before and after the inspection operation to tighten or loosen the cable ends. It is convenient to operate and helps to improve the inspection efficiency of the device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0030] In the accompanying diagrams described below, the length of the test platform is marked as the left-right direction, and the width is marked as the front-back direction.

[0031] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0032] In the attached diagram:

[0033] Figure 1 A schematic diagram of the overall structure of this utility model is shown;

[0034] Figure 2 A schematic diagram of the overall bottom side structure of this utility model is shown;

[0035] Figure 3 A schematic diagram showing the installation position of the vertical sliding rod of this utility model is provided.

[0036] Figure 4 This diagram shows the installation position of the mountain-shaped positioning component of this utility model;

[0037] Figure 5 A schematic diagram of the mountain-shaped positioning component of this utility model is shown;

[0038] Figure 6The diagram shows the mountain-shaped positioning component and the vertical sliding rod of this utility model in a plug-in engagement state.

[0039] List of reference numerals in the attached diagram:

[0040] 1. Test bench; 101. Longitudinal strip groove; 102. Hexagonal track shaft; 103. Rectangular mounting groove; 104. Horizontal brace track shaft; 105. Longitudinal support rod; 106. U-shaped positioning frame; 107. T-shaped slider; 108. U-shaped hanging frame;

[0041] 2. Cables;

[0042] 3. Motor; 301. Lead screw;

[0043] 4. Tension sensor;

[0044] 5. Control box;

[0045] 6. U-shaped sliding frame; 601. Cross brace U-shaped frame; 602. Hexagonal positioning shaft;

[0046] 7. Z-shaped clamp; 701. Connecting rod;

[0047] 8. Vertical sliding rod; 801. Hexagonal drive shaft; 802. L-shaped footplate;

[0048] 9. Mountain-shaped positioning component; 901. Pull rod; 902. Drive lever. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0050] Please refer to Figures 1 to 6 ; Example

[0051] This utility model proposes a photovoltaic cable R&D strength testing device, including: a test bench 1 and a cable 2. The test bench 1 has a longitudinal strip groove 101 and a rectangular mounting groove 103 respectively through the middle position of the two short sides.

[0052] A hexagonal track shaft 102 is welded into the longitudinal strip groove 101. Two Z-shaped clamps 7 are symmetrically slidably installed on the hexagonal track shaft 102 by spring push. A longitudinally sliding U-shaped sliding frame 6 is installed inside the rectangular mounting groove 103. A hexagonal positioning shaft 602 is welded into the top opening of the U-shaped sliding frame 6. Two Z-shaped clamps 7 are symmetrically slidably installed on the hexagonal positioning shaft 602 by spring push.

[0053] Four Z-shaped clamps 7 are arranged in pairs to clamp and fix the beginning and end ends of the cable 2 respectively; U-shaped hanging frames 108 are welded to the bottom side of the test bench 1 near the two ends of the longitudinal strip groove 101, and vertical sliding rods 8 are slidably installed on both the U-shaped hanging frames 108 and the U-shaped sliding frame 6; two connecting rods 701 are symmetrically rotated between the bottom ends of the two Z-shaped clamps 7 arranged in a pair and the top ends of the vertical sliding rods 8; a hexagonal drive shaft 801 is welded and fixed to the bottom end of the vertical sliding rod 8 located below the longitudinal strip groove 101, and the beginning end of the hexagonal drive shaft 801 slides through and engages with the bottom end of the other vertical sliding rod 8;

[0054] Four Z-shaped clamps 7, four pull rods 901, and two vertical slide rods 8 are connected to form two crank-slider mechanisms. Through these two mechanisms, the two vertical slide rods 8 slide downwards, which can drive the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right to slide closer to each other and clamp and fix the beginning and end parts of the cable 2. The hexagonal drive shaft 801 can drive the two vertical slide rods 8 to slide down synchronously, control the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right to slide closer to each other synchronously, and complete the clamping and fixing of the beginning and end parts of the cable 2 in one go.

[0055] Both the U-shaped hanging frame 108 and the U-shaped sliding frame 6 are slidably mounted with mountain-shaped positioning parts 9 by spring pushing. The two mountain-shaped positioning parts 9 support each other and are used to insert and fix the two vertical sliding rods 8 respectively. Both mountain-shaped positioning parts 9 are rotatably connected with pull rods 901, and the first ends of the two pull rods 901 are rotatably connected together.

[0056] When the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right slide close together to clamp, the two springs on the hexagonal track shaft 102 and the hexagonal positioning shaft 602 are compressed respectively. The two mountain-shaped positioning parts 9 can insert and position the vertical slide rod 8 in the sliding state, so that the four Z-shaped clamps 7 are kept in the clamping state. When the two mountain-shaped positioning parts 9 are slid close together and separated from the two vertical slide rods 8, the two vertical slide rods 8 can be released. After the two vertical slide rods 8 are released, the two springs on the hexagonal track shaft 102 and the hexagonal positioning shaft 602 automatically rebound and push and drive the left The two Z-shaped clamps 7 on the side and the two Z-shaped clamps 7 on the right side slide away from each other to loosen the beginning and end of the cable 2. Since the beginning of the two pull rods 901 are rotated and connected together, the connection part of the beginning of the two pull rods 901 can be slid upward, and the two pull rods 901 can be lifted upward synchronously. Since the two pull rods 901 are in a relatively upward tilted state, when the two pull rods 901 are lifted upward synchronously, they can pull and drive the two mountain-shaped positioning parts 9 to slide closer to each other, and at the same time release the two vertical sliding rods 8, completing the loosening operation of the beginning and end of the cable 2 in one go.

[0057] The two pull rods 901 of this utility model, together with the hexagonal drive shaft 801, can directly or indirectly drive the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right to slide towards each other, completing the tightening and loosening of the two ends of the cable 2 in one go. Compared with the prior art, it eliminates the trouble of having to slide the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 towards each other step by step before and after the inspection operation to tighten and loosen the two ends of the cable 2. It is convenient to operate and use, and helps to improve the inspection operation efficiency of the device.

[0058] Preferred,

[0059] On the opposite side of the two vertical sliding rods 8, there is a row of toothed grooves, and the first end of the insert plate in the middle position inside the mountain-shaped positioning part 9 has a slanted section structure. The slanted section of the first end of the insert plate of the mountain-shaped positioning part 9 is inserted and matched with a row of toothed grooves.

[0060] Preferred,

[0061] The hexagonal drive shaft 801 is laterally supported, and an L-shaped step plate 802 is welded to the bottom of the middle section.

[0062] Preferred,

[0063] The U-shaped sliding frame 6 is vertically supported, and the two vertical sliding rods 8 correspond to the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame 6 and the U-shaped hanging frame 108 and slide through it.

[0064] The two mountain-shaped positioning parts 9 are arranged horizontally, and the two mountain-shaped positioning parts 9 are connected to the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame 6 and the U-shaped hanging frame 108 through sliding fit.

[0065] Preferred,

[0066] The two pull rods 901 are rotatably mounted with drive handles 902 at their ends, and the two pull rods 901 are rotatably connected together by drive handles 902; the drive handles 902 are longitudinally supported, and their ends extend to the bottom of one long side of the test bench 1.

[0067] By driving the lever 902, the connecting parts at the beginning of the two pull rods 901 can be slid upward, and the two pull rods 901 can be pulled upward synchronously.

[0068] Preferred,

[0069] Two cross bracing track shafts 104 are symmetrically welded to the two short sides inside the rectangular mounting groove 103, and the U-shaped sliding frame 6 slides in cooperation with the two cross bracing track shafts 104.

[0070] The top part of the U-shaped hanging frame 108 is welded with a cross bracing U-shaped frame 601.

[0071] Preferred,

[0072] Two U-shaped ground support frames are symmetrically welded to the bottom of the two short sides of the test bench 1. The top part of the ground support frame located on one side of the cross brace U-shaped frame 601 is welded with a longitudinal support rod 105, and the middle part of the longitudinal support rod 105 is welded with a transverse support U-shaped positioning frame 106. A T-shaped slider 107 is slidably installed on the U-shaped positioning frame 106, and a tension sensor 4 is threadedly connected between the top part of the T-shaped slider 107 and the first end part of the cross brace U-shaped frame 601.

[0073] The two Z-shaped clamps 7 on the left can clamp and fix the first end of the cable 2 to the test bench 1, and the two Z-shaped clamps 7 on the right can indirectly clamp and fix the tail end of the cable 2 to the T-shaped slider 107.

[0074] Preferred,

[0075] The first end of the U-shaped positioning frame 106 is bolted to install a motor 3. A lead screw 301 is connected to the shaft of the motor 3. The first end of the lead screw 301 is rotatably connected to the longitudinal support rod 105, and the lead screw 301 is screwed through and screwed into the middle part of the bottom side of the T-shaped slider 107.

[0076] Through the lead screw 301, the motor 3 can reverse to drive the T-shaped slider 107, the tension sensor 4, the cross brace U-shaped frame 601 and the U-shaped sliding frame 6 to slide to the right, thereby pulling the cable 2 which is clamped between the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right, and performing tensile strength testing on the cable 2.

[0077] The control box 5 is bolted to a corner of the test bench 1 located on one side of the motor 3. A digital display controller is embedded in the top wall of the control box 5, and electrical components that control the forward and reverse rotation of the motor 3 are installed inside the control box 5. The tension sensor 4 is electrically connected to the digital display controller.

[0078] During the testing process, the tension sensor 4 can detect the tension output from the motor 3 to the cable 2 through the lead screw 301 in real time. The tension data detected by the tension sensor 4 is transmitted to the digital display controller in real time and displayed on the LED screen of the digital display controller in real time. When the tension on the cable 2 reaches the test standard value, the motor 3 is turned off and the cable 2 is loosened and removed. After the cable 2 is removed, check whether the outer sheath of the cable 2 is damaged and peel off the outer sheath of the cable 2 to check whether there are broken wire cores. If there are, the tensile strength of the cable 2 is deemed unqualified; otherwise, it is qualified.

[0079] It is worth noting that the brand of the tension sensor 4 and the digital display controller is Zhongnuo Chuanli, the model of the tension sensor 4 is ZNLBS, and the model of the digital display controller is ZN5H.

[0080] The electrical components used to control the forward and reverse rotation of motor 3, the wiring methods between electrical components, between electrical components and motor 3, and between tension sensor 4 and digital display controller are all existing technologies for those engaged in the installation, design, commissioning, maintenance and technical transformation of equipment automation systems. There are also mature corresponding solutions on the market, and manufacturers can use them after simple debugging after purchasing them. Therefore, they will not be elaborated here.

[0081] The working principle of this embodiment is as follows: the two Z-shaped clamps 7 on the left can clamp and fix the first end of the cable 2 to the test bench 1, and the two Z-shaped clamps 7 on the right can indirectly clamp and fix the tail end of the cable 2 to the T-shaped slider 107.

[0082] Through the lead screw 301, the motor 3 can reverse to drive the T-shaped slider 107, the tension sensor 4, the cross brace U-shaped frame 601 and the U-shaped sliding frame 6 to slide to the right, thereby pulling the cable 2 which is clamped between the two Z-shaped clamps 7 on the left and the two Z-shaped clamps 7 on the right, and performing tensile strength testing on the cable 2.

[0083] During the testing process, the tension sensor 4 can detect the tension output from the motor 3 to the cable 2 through the lead screw 301 in real time. The tension data detected by the tension sensor 4 is transmitted to the digital display controller in real time and displayed on the LED screen of the digital display controller in real time. When the tension on the cable 2 reaches the test standard value, the motor 3 is turned off and the cable 2 is loosened and removed. After the cable 2 is removed, check whether the outer sheath of the cable 2 is damaged and peel off the outer sheath of the cable 2 to check whether there are broken wire cores. If there are, the tensile strength of the cable 2 is deemed unqualified; otherwise, it is qualified.

[0084] After all the testing processes are completed, the motor 3 needs to be turned on and rotated forward to push the T-shaped slider 107, tension sensor 4, cross brace U-shaped frame 601 and U-shaped sliding frame 6 to slide to the left and reset to the initial state, so that they can be used for testing again.

[0085] The following points should be noted in this article:

[0086] 1. The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment; other structures can refer to general designs.

[0087] 2. Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0088] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A strength testing device for photovoltaic cables, comprising: The test bench (1) and the cable (2) are provided with a longitudinal strip groove (101) and a rectangular mounting groove (103) respectively through the middle of the two short sides of the test bench (1); The feature is that a hexagonal track shaft (102) is welded in the longitudinal strip groove (101), and two Z-shaped clamps (7) are symmetrically slidably installed on the hexagonal track shaft (102) by spring push. A longitudinally sliding U-shaped sliding frame (6) is installed inside the rectangular mounting groove (103), and a hexagonal positioning shaft (602) is welded in the top opening of the U-shaped sliding frame (6). Two Z-shaped clamps (7) are symmetrically slidably installed on the hexagonal positioning shaft (602) by spring push. The four Z-shaped clamps (7) are arranged in pairs to clamp and fix the beginning and end ends of the cable (2); U-shaped hanging frames (108) are welded to the bottom side of the test bench (1) near the two ends of the longitudinal strip groove (101), and vertical slide rods (8) are slidably installed on the U-shaped hanging frames (108) and the U-shaped sliding frames (6); two connecting rods (701) are symmetrically rotated between the bottom ends of the two Z-shaped clamps (7) arranged in a pair and the top ends of the vertical slide rods (8); a hexagonal drive shaft (801) is welded and fixed to the bottom end of the vertical slide rod (8) located below the longitudinal strip groove (101), and the beginning end of the hexagonal drive shaft (801) is slidably engaged with the bottom end of the other vertical slide rod (8); Both the U-shaped hanging frame (108) and the U-shaped sliding frame (6) are equipped with mountain-shaped positioning parts (9) by spring pushing and sliding. The two mountain-shaped positioning parts (9) support each other and are used to insert and fix the two vertical sliding rods (8) respectively. Both mountain-shaped positioning parts (9) are rotatably connected with pull rods (901), and the first ends of the two pull rods (901) are rotatably connected together.

2. The photovoltaic cable R&D strength testing device according to claim 1, characterized in that, On the opposite side of the two vertical sliding rods (8), a row of toothed grooves is provided, and the first end of the insert plate in the middle position of the mountain-shaped positioning part (9) is obliquely cut. The obliquely cut part of the first end of the insert plate of the mountain-shaped positioning part (9) is inserted and matched with a row of toothed grooves.

3. The photovoltaic cable R&D strength testing device according to claim 1, characterized in that, The hexagonal drive shaft (801) is laterally supported, and an L-shaped step plate (802) is welded to the bottom of the middle section.

4. The photovoltaic cable R&D strength testing device according to claim 1, characterized in that, The U-shaped sliding frame (6) is vertically supported, and the two vertical sliding rods (8) are connected to the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame (6) and the U-shaped hanging frame (108) through sliding fit; The two mountain-shaped positioning parts (9) are arranged horizontally, and the two mountain-shaped positioning parts (9) are connected to the middle part of the bottom longitudinal support rod section of the U-shaped sliding frame (6) and the U-shaped hanging frame (108) through sliding fit.

5. The photovoltaic cable R&D strength testing device according to claim 1, characterized in that, The two pull rods (901) are rotatably mounted with drive levers (902) at their ends, and the two pull rods (901) are rotatably connected together by the drive levers (902); The drive lever (902) is longitudinally supported and its head extends to the underside of one long side of the test bench (1).

6. The photovoltaic cable R&D strength testing device according to claim 1, characterized in that, The rectangular mounting groove (103) has two cross bracing track shafts (104) symmetrically welded on the two short sides inside. The U-shaped sliding frame (6) is in sliding cooperation with the two cross bracing track shafts (104). The top part of the U-shaped hanging frame (108) is welded with a cross bracing U-shaped frame (601).

7. The photovoltaic cable R&D strength testing device according to claim 6, characterized in that, The test bench (1) has two symmetrically welded bottom sections of two short sides with two U-shaped ground support frames. The top section of the ground support frame located on one side of the horizontal support U-shaped frame (601) has a longitudinal support rod (105) welded in, and the middle section of the longitudinal support rod (105) has a transverse support U-shaped positioning frame (106) welded in. A T-shaped slider (107) is slidably mounted on the U-shaped positioning frame (106), and a tension sensor (4) is threadedly connected between the top part of the T-shaped slider (107) and the first part of the cross brace U-shaped frame (601).

8. The photovoltaic cable R&D strength testing device according to claim 7, characterized in that, The first end of the U-shaped positioning frame (106) is fitted with a motor (3) by bolts. A lead screw (301) is connected to the shaft of the motor (3). The first end of the lead screw (301) is rotatably connected to the longitudinal support rod (105), and the lead screw (301) is screwed through the middle part of the bottom side of the T-shaped slider (107).

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