A voltage detection test device for cable joints

Abstract

The present invention discloses a voltage detection test device for cable joints, which relates to the technical field of voltage detection of cable joints and includes a base and a display screen. Two grooves are symmetrically formed at the top of the base. A detection structure is arranged on the top of the base. The detection structure includes a storage rack arranged on the top of the base. A plurality of hollow boxes I are fixedly arranged inside the storage rack. A conductive plate is fixedly arranged inside the hollow box I. Four conductive chute plates are fixedly arranged on one side of the conductive plate, and a conductive block is slidably arranged inside the conductive chute plate. A conductive rod is fixedly arranged on one side of the conductive block, and a bottom plate is fixedly arranged outside the conductive rod on one side of the conductive block. The voltage detection test device for cable joints of the present invention enables the device to be adaptively adjusted according to the sizes of the male or female cable joints, and can improve the working adaptability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of cable joint voltage detection, and particularly relates to a cable joint voltage detection test device. Background Art

[0002] There are various types of cable joints, which usually play a role in connecting cable lines. In order to avoid short circuits and other situations after the cable lines are connected, it is necessary to detect the voltage of the cable joints. Especially for cable joints arranged as male heads and female sockets, the male head cable joint is convexly arranged, while the female socket cable joint is correspondingly concave. Generally, the male head or the female socket is inserted into the socket of the detection device for detection.

[0003] However, traditional detection devices can only perform voltage detection on cable joints with fixed-sized male heads or female sockets, and cannot adaptively adjust according to the size of the male head or female socket, so their use has limitations. Therefore, the present invention proposes a cable joint voltage detection test device. Summary of the Invention

[0004] The main purpose of the present invention is to provide a cable joint voltage detection test device, which can effectively solve the technical problems proposed in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A cable joint voltage detection test device includes a base and a display screen. Two grooves are symmetrically opened at the top of the base, and a detection structure is arranged on the top of the base.

[0007] The detection structure includes a storage rack, which is arranged on the top of the base. A number of hollow boxes I are fixedly arranged inside the storage rack. A conductive plate is fixedly arranged inside the hollow box I. Four conductive chute plates are fixedly arranged on one side of the conductive plate, and a conductive block is slidably arranged inside the conductive chute plate. A conductive rod is fixedly arranged on one side of the conductive block. A bottom plate is fixedly arranged outside the conductive rod on one side of the conductive block. A spring I is arranged between the bottom plate and the inside of the hollow box I.

[0008] As a preferred technical solution of the present invention, the detection structure further includes an expansion component. The expansion component includes an electric push rod I, which is arranged on the top of the base. One end of the electric push rod I is fixedly provided with a push plate I. The push plate I is fixedly connected to a push plate II. A number of connecting rods are fixedly arranged on one side of the push plate II, and one end of the connecting rod penetrates through the hollow box I and is fixedly connected to an insulating cone.

[0009] As a preferred technical solution of the present invention, the display screen is fixedly arranged on the top of the storage rack, and the top of the conductive plate sequentially penetrates through the first hollow box, the storage rack and is fixedly connected to the display screen.

[0010] As a preferred technical solution of the present invention, circular holes are formed in both the front part of the first hollow box and one side of the conductive plate, and the centers of the circular holes of the first hollow box and the conductive plate coincide.

[0011] As a preferred technical solution of the present invention, an adjusting structure is arranged on the top of the base. The adjusting structure includes two sliders, two second electric push rods, and a second hollow box. The sliders are slidably arranged inside the grooves of the base. The second electric push rods are arranged on the top of the base. The second hollow box is fixedly connected to the sliders. Connecting plates are fixedly arranged on both sides of the second hollow box, and one end of the connecting plates is fixedly connected to the second electric push rods. Two square holes are formed in the top of the second hollow box, and a gear disk is rotatably arranged on the top of the second hollow box. The gear disk is meshed with two serrated plates. The bottom of the serrated plate is fixedly connected to a cross plate. A plurality of linkage plates are fixedly connected to the bottom of the cross plate, and one end of the linkage plate is fixedly connected to a first arc-shaped plate. A third electric push rod is arranged on the top of the second hollow box, and one end of the third electric push rod is fixedly connected to a connecting block. The connecting block is fixedly connected to one of the cross plates.

[0012] As a preferred technical solution of the present invention, the adjusting structure further includes a plurality of compression components. The compression components include two gantry frames. The gantry frames are fixedly connected to the inside of the second hollow box. A movable rod is movably arranged outside the gantry frames. One end of the movable rod is fixedly connected to a second arc-shaped plate, and a second spring is arranged between the other end of the movable rod and the inside of the gantry frames.

[0013] As a preferred technical solution of the present invention, a plurality of circular holes are formed in both the front and rear parts of the second hollow box, and the centers of the circular holes of the second hollow box coincide with the centers of the circular holes of the corresponding first hollow box and the conductive plate.

[0014] As a preferred technical solution of the present invention, the linkage plate is slidably connected to the square hole, and one end of the second arc-shaped plate is arranged in a curved and upturned state.

[0015] As a preferred technical solution of the present invention, an auxiliary structure is arranged on the top of the base. The auxiliary structure includes two fixed blocks. The fixed blocks are fixedly connected to the base. A cross bar is rotatably arranged through between the two fixed blocks. A plurality of fixing frames are fixedly arranged on the outside of the cross bar, and an outer sleeve is rotatably arranged on the outside of the fixing frames. Connecting arms one are fixedly arranged at both ends of the cross bar. One end of the connecting arm one is rotatably connected to a connecting arm two. One end of the connecting arm two is rotatably connected to a fixed rod, and the fixed rod is fixedly connected to the connecting plate.

[0016] As a preferred technical solution of the present invention, one end of the conductive rod is arranged in a bent and tilted state.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting up the detection structure, the device can be adaptively expanded according to the size of the male connector, so that the conductive rod can always be in contact with the conductive part of the male cable connector, which is beneficial to improving the working adaptability of the device. At the same time, the bending and tilting of one end of the conductive rod is conducive to the insertion of the male cable connector;

[0019] 2. By setting the expansion component and the detection structure, the device can be adaptively expanded according to the inner diameter of the female cable connector, so that the conductive rod can always be in contact with the inner conductive part of the female cable connector, which is beneficial to improve the working adaptability of the device;

[0020] 3. By setting the adjustment structure and the detection structure, it is helpful to fix the position of the male or female cable connector, and at the same time ensure that the male or female connector can be aligned with the center of the circular hole of the corresponding hollow box, and ensure that the male or female cable connector matches the four conductive rods to avoid the wrong position after insertion affecting the detection result;

[0021] 4. By setting the compression assembly and the adjustment structure, it is beneficial to further limit the position of the male head or the female seat, so that it is always located at the matching position of the center of the circular hole of the hollow box 2, which is beneficial to the insertion of the male head or the female seat after the hollow box 2 is moved in the later stage;

[0022] 5. By setting up an auxiliary structure in conjunction with the adjustment structure, it is helpful to flip the fixing frame ninety degrees when the hollow box 2 moves toward the storage rack, so that the fixing frame is finally vertical to the top of the base, which is helpful to separate the cables of the male or female cable connector and avoid the male or female cable connector from getting entangled during the movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a cable joint voltage detection test device of the present invention;

[0024] Figure 2 It is a cross-sectional three-dimensional structural schematic diagram of a storage rack and a hollow box 1 of a cable joint voltage detection test device of the present invention;

[0025] Figure 3 It is a schematic diagram of the split three-dimensional structure of a conductive block and a conductive chute plate of a cable joint voltage detection test device of the present invention;

[0026] Figure 4 Schematic three-dimensional structure diagram of the first electric push rod of a cable joint voltage detection test device of the present invention;

[0027] Figure 5 Schematic three-dimensional structure diagram of the insulating cone of a cable joint voltage detection test device of the present invention;

[0028] Figure 6 Schematic cross-sectional three-dimensional structure diagram of the second hollow box of a cable joint voltage detection test device of the present invention;

[0029] Figure 7 Schematic three-dimensional structure diagram of the second arc plate of a cable joint voltage detection test device of the present invention;

[0030] Figure 8 Schematic front view of the cross-section of the second hollow box of a cable joint voltage detection test device of the present invention;

[0031] Figure 9 Schematic three-dimensional structure diagram of the gear disc and the serrated plate of a cable joint voltage detection test device of the present invention;

[0032] Figure 10 Schematic partial three-dimensional structure diagram of a cable joint voltage detection test device of the present invention;

[0033] Figure 11 Schematic front view of the whole of a cable joint voltage detection test device of the present invention;

[0034] Figure 12 Schematic side view of the whole of a cable joint voltage detection test device of the present invention;

[0035] Figure 13 Schematic top view of the whole of a cable joint voltage detection test device of the present invention;

[0036] Figure 14 Schematic three-dimensional structure diagram of the whole from another perspective of a cable joint voltage detection test device of the present invention.

[0037] In the figure: 1, base; 2, display screen; 3, detection structure; 4, adjustment structure; 5, auxiliary structure; 6, shelf; 7, hollow box 1; 8, conductive plate; 9, conductive slide plate; 10, conductive block; 11, conductive rod; 12, bottom plate; 13, spring 1; 14, electric push rod 1; 15, push plate 1; 16, push plate 2; 17, insulating cone; 18, slider; 19, electric push rod 2; 20, hollow box 2; 21. Connecting plate; 22. Square hole; 23. Gear plate; 24. Sawtooth plate; 25. Horizontal plate; 26. Linkage plate; 27. Arc plate one; 28. Electric push rod three; 29. ​​Connecting block; 30. Gantry; 31. Movable rod; 32. Arc plate two; 33. Spring two; 34. Fixed block; 35. Horizontal rod; 36. Fixed frame; 37. Jacket; 38. Connecting arm one; 39. Connecting arm two; 40. Fixed rod. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] like Figures 1 - 14 As shown, a cable joint voltage detection test device comprises a base 1 and a display screen 2. Two grooves are symmetrically provided on the top of the base 1, and a detection structure 3 is provided on the top of the base 1;

[0040] The detection structure 3 includes a storage rack 6, which is arranged on the top of the base 1. A plurality of hollow boxes 7 are fixedly arranged on the inner side of the storage rack 6. A conductive plate 8 is fixedly arranged on the inner side of the hollow box 7. Four conductive slide plates 9 are fixedly arranged on one side of the conductive plate 8. A conductive block 10 is slidably arranged on the inner side of the conductive slide plate 9. A conductive rod 11 is fixedly arranged on one side of the conductive block 10. A bottom plate 12 is fixedly arranged on one side of the conductive block 10 and located outside the conductive rod 11. A spring 13 is arranged between the bottom plate 12 and the inner side of the hollow box 7.

[0041] The detection structure 3 can be adaptively expanded according to the size of the male connector, so that the conductive rod 11 can always be in contact with the conductive part of the male cable connector, which is beneficial to improving the working adaptability of the device. At the same time, the bending and tilting setting of one end of the conductive rod 11 is beneficial to the insertion of the male cable connector.

[0042] In this embodiment, the detection structure 3 also includes an extension component, which includes an electric push rod 14, which is arranged on the top of the base 1, and a push plate 15 is fixedly provided at one end of the electric push rod 14, and the push plate 15 is fixedly connected to a push plate 2 16, and a plurality of connecting rods are fixedly provided on one side of the push plate 2 16, and one end of the connecting rod passes through the hollow box 17 and is fixedly connected to an insulating cone 17.

[0043] The expansion component matching detection structure 3 enables the device to adaptively expand according to the inner diameter of the female socket cable connector, allowing the conductive rod 11 to always contact the inner conductive part of the female socket cable connector, which is beneficial to improving the working adaptability of the device.

[0044] In this embodiment, the display screen 2 is fixedly arranged at the top of the storage rack 6, and the top of the conductive plate 8 sequentially penetrates through the first hollow box 7, the storage rack 6 and is fixedly connected to the display screen 2.

[0045] The connection between the conductive plate 8 and the display screen 2 is beneficial to displaying the detected voltage structure.

[0046] In this embodiment, circular holes are provided in the front part of the first hollow box 7 and on one side of the conductive plate 8, and the centers of the circular holes of the first hollow box 7 and the conductive plate 8 coincide.

[0047] The circular hole of the first hollow box 7 is beneficial to the insertion of the male or female socket, and the circular hole of the conductive plate 8 is beneficial to the insertion of the insulating cone 17.

[0048] In this embodiment, an adjustment structure 4 is arranged on the top of the base 1. The adjustment structure 4 includes two sliders 18, two second electric push rods 19, and a second hollow box 20. The sliders 18 are slidably arranged inside the groove of the base 1. The second electric push rods 19 are arranged on the top of the base 1. The second hollow box 20 is fixedly connected to the sliders 18. Connecting plates 21 are fixedly arranged on both sides of the second hollow box 20, and the connecting plates 21 are fixedly connected to one end of the second electric push rods 19. Two square holes 22 are provided on the top of the second hollow box 20, and a gear disc 23 is rotatably arranged on the top of the second hollow box 20. The gear disc 23 is meshed with two serrated plates 24. The bottom of the serrated plate 24 is fixedly connected to a cross plate 25. A plurality of linkage plates 26 are fixedly connected to the bottom of the cross plate 25, and one end of the linkage plate 26 is fixedly connected to an arc-shaped plate one 27. A third electric push rod 28 is arranged on the top of the second hollow box 20, and one end of the third electric push rod 28 is fixedly connected to a connecting block 29, and the connecting block 29 is fixedly connected to one of the cross plates 25.

[0049] The adjustment structure 4 cooperating with the detection structure 3 can fix the position of the cable connector of the male or female socket, and at the same time ensure that the male or female socket can be aligned with the center position of the circular hole of the corresponding first hollow box 7, ensuring that the cable connector of the male or female socket matches the four conductive rods 11, and avoiding the influence of incorrect position after insertion on the detection result.

[0050] In this embodiment, the adjustment structure 4 further includes a plurality of compression components. The compression components include two gantry frames 30. The gantry frames 30 are fixedly connected to the inside of the second hollow box 20. A movable rod 31 is movably arranged outside the gantry frames 30. One end of the movable rod 31 is fixedly connected to an arc-shaped plate two 32, and a second spring 33 is arranged between the other end of the movable rod 31 and the inside of the gantry frames 30.

[0051] The compression component matching adjustment structure 4 can further limit the position of the male head or female socket, so that it is always located at a position matching the center of the circular hole of the second hollow box 20, which is beneficial to the insertion work of the male head or female socket after the second hollow box 20 moves later.

[0052] In this embodiment, a plurality of circular holes are provided at the front and rear parts of the second hollow box 20, and the centers of the circular holes of the second hollow box 20 coincide with the centers of the circular holes of the first hollow box 7 and the conductive plate 8 at the corresponding positions.

[0053] One end of the cable joint of the male head or female socket is inserted into the circular hole at the front of the second hollow box 20, and its conductive part is exposed from the circular hole at the rear of the second hollow box 20.

[0054] In this embodiment, the linkage plate 26 is slidably connected to the square hole 22, and one end of the second arc-shaped plate 32 is arranged in a curved and upturned state.

[0055] The linkage plate 26 moves in the square hole 22 at the top of the second hollow box 20, and the cross plate 25 plays a constraining role on it.

[0056] In this embodiment, an auxiliary structure 5 is arranged on the top of the base 1. The auxiliary structure 5 includes two fixing blocks 34. The fixing blocks 34 are fixedly connected to the base 1. A cross bar 35 is rotatably arranged through between the two fixing blocks 34. A plurality of fixing frames 36 are fixedly arranged on the outer part of the cross bar 35. An outer sleeve 37 is rotatably arranged on the outer part of the fixing frame 36. Connecting arms 38 are fixedly arranged at both ends of the cross bar 35. One end of the connecting arm 38 is rotatably connected to a connecting arm 39. One end of the connecting arm 39 is rotatably connected to a fixing rod 40, and the fixing rod 40 is fixedly connected to the connecting plate 21.

[0057] The auxiliary structure 5 cooperating with the adjustment structure 4 can flip the fixing frame 36 by ninety degrees during the process of the second hollow box 20 moving towards the storage rack 6, so that the fixing frame 36 is finally perpendicular to the top of the base 1, which is beneficial to cutting off the cable of the male head or female socket cable joint and avoiding the situation of entanglement of the male head or female socket cable joint during the movement.

[0058] In this embodiment, one end of the conductive rod 11 is arranged in a curved and upturned state.

[0059] One end of the conductive rod 11 being curved and upturned is beneficial to the insertion work of the cable joint of the male head or female socket.

[0060] It should be noted that the present invention is a cable joint voltage detection test device. Before use, place the device in the required place, and it can reach the operating conditions for work;

[0061] When voltage detection needs to be performed on the male cable connector, one end of the male head whose voltage needs to be detected is inserted between the corresponding two second arc-shaped plates 32, so that the two second arc-shaped plates 32 clamp the insulating part of the male head near the conductive position under the action of the second spring 33. At this time, the conductive part of the male head passes through the inside of the second hollow box 20 and exposes from the rear circular hole of the second hollow box 20. Start the third electric push rod 28 so that it acts on one of the cross plates 25 through the connecting block 29 to drive the corresponding sawtooth plate 24 to move. One of the sawtooth plates 24 meshes with the gear disc 23 to move, so that the other sawtooth plate 24 drives the corresponding cross plate 25 to move synchronously in the opposite direction. The cross plate 25 drives the first arc-shaped plate 27 to move synchronously through the linkage plate 26, and finally the two first arc-shaped plates 27 at the corresponding positions stop after clamping the insulating part of the male head near the conductive position. At this time, the conductive position of the male head matches the center position of the circular holes of the first hollow box 7 and the second hollow box 20 under the action of the first arc-shaped plate 27 and the second arc-shaped plate 32;

[0062] Start the second electric push rod 19 to make the second hollow box 20 move towards the storage rack 6. During the process, when the conductive part of the male head touches the bent and upturned parts at one ends of the corresponding four conductive rods 11, it acts on the four conductive rods 11 to expand outwards. The conductive rods 11 always fit against the outside of the conductive part of the male head under the action of the first spring 13 until the slider 18 moves from the inner end to the outer end of the groove of the base 1 and then stops. At this time, the conductive part of the male head is inserted into the inside of the first hollow box 7 and is located inside the corresponding four conductive rods 11. At the same time, the inside of the four conductive rods 11 fits against the outside of the conductive part of the male head. At this time, the male cable connector can be energized for voltage detection work, and the voltage detection result can be obtained by observing the display screen 2;

[0063] When the second electric push rod 19 acts on the second hollow box 20 to move towards the storage rack 6, the connecting plate 21 synchronously drives the fixing rod 40 to move. The fixing rod 40 acts on one end of the first connecting arm 38 through the second connecting arm 39 to rotate towards the second hollow box 20, so that the other end of the first connecting arm 38 synchronously drives the cross bar 35 to rotate. The cross bar 35 drives the fixing frame 36 to move synchronously. Finally, the fixing frame 36 rotates 90 degrees and is perpendicular to the top surface of the base 1. Several fixing frames 36 cooperate with the corresponding outer sleeves 37 to isolate the corresponding cables, avoiding the entanglement of the male head after movement;

[0064] In addition, when it is necessary to perform voltage detection on the cable connector of the female socket, the operation is the same as that for the male cable connector. When one end of the female socket is inserted into the hollow box 7, according to the inner diameter of the female socket, the electric push rod 14 is started to make the push plate 15 move with the push plate 2 16, the connecting rod and the insulating cone 17 toward the storage rack 6. During the process, the insulating cone 17 acts on the corresponding four conductive blocks 10 to perform expansion movement until the corresponding conductive rod 11 bends and tilts to one end and fits the inner side of the female socket and then stops. At this time, the power supply can be started to perform voltage detection on the female socket cable connector, and the display screen 2 is observed to obtain the result of the voltage detection.

Claims

1. A cable joint voltage detection test device, comprising a base and a display screen, wherein two grooves are symmetrically provided on the top of the base, and characterized in that: A detection structure is provided on the top of the base; The detection structure comprises a storage rack, the storage rack is arranged on the top of the base, a plurality of hollow boxes 1 are fixedly arranged on the inner side of the storage rack, a conductive plate is fixedly arranged on the inner side of the hollow box 1, four conductive slide plates are fixedly arranged on one side of the conductive plate, and a conductive block is slidably arranged on the inner side of the conductive slide plate, a conductive rod is fixedly arranged on one side of the conductive block, a bottom plate is fixedly arranged on one side of the conductive block outside the conductive rod, and a spring 1 is arranged between the bottom plate and the inner side of the hollow box 1; The detection structure also includes an extension component, which includes an electric push rod 1, which is arranged on the top of the base, and one end of the electric push rod 1 is fixedly provided with a push plate 1, and the push plate 1 is fixedly connected to a push plate 2, and one side of the push plate 2 is fixedly provided with a plurality of connecting rods, and one end of the connecting rod passes through the hollow box 1 and is fixedly connected to an insulating cone; A circular hole is formed on the front of the hollow box 1 and one side of the conductive plate, and the centers of the circular holes of the hollow box 1 and the conductive plate coincide with each other; The top of the base is provided with an adjustment structure, which includes two sliders, two electric push rods 2, and a hollow box 2. The sliders are slidably arranged inside the groove of the base, the electric push rods 2 are arranged on the top of the base, and the hollow box 2 is fixedly connected to the sliders; One end of the conductive rod is arranged in a bent and tilted state; When the voltage of the male cable connector needs to be tested, the electric push rod 2 is started to move the hollow box 2 toward the storage rack. During the process, when the conductive part of the male connector contacts the bent and raised part of one end of the corresponding four conductive rods, the four conductive rods are acted on to expand outwards. The conductive rods are always in contact with the outer side of the conductive part of the male connector under the action of the spring 1 until the slider moves from one end of the inner side of the groove of the base to the other end and stops. When it is necessary to perform voltage detection on the cable connector of the mother socket, when one end of the mother socket is inserted into the hollow box one, according to the inner diameter of the mother socket, the electric push rod one is started to make the push plate one move with the push plate two, the connecting rod and the insulating cone toward the storage rack. During the process, the insulating cone acts on the corresponding four conductive blocks to perform expansion movement until the bent and raised end of the corresponding conductive rod fits with the inner side of the mother socket and stops.

2. A cable joint voltage detection test device according to claim 1, characterized in that: The display screen is fixedly arranged on the top of the storage rack, and the top of the conductive plate sequentially passes through the hollow box 1, the storage rack and the display screen and is fixedly connected.

3. A cable joint voltage detection test device according to claim 1, characterized in that: Connecting plates are fixedly provided on both sides of the hollow box two, and the connecting plates are fixedly connected to one end of the electric push rod two, two square holes are provided on the top of the hollow box two, and a gear plate is rotatably provided on the top of the hollow box two, the gear plate is meshingly connected to two serrated plates, a cross plate is fixedly connected to the bottom of the serrated plate, a plurality of linkage plates are fixedly connected to the bottom of the cross plate, and an arc plate one is fixedly connected to one end of the linkage plate, an electric push rod three is provided on the top of the hollow box two, and a connecting block is fixedly connected to one end of the electric push rod three, and the connecting block is fixedly connected to one of the cross plates.

4. A cable joint voltage detection test device according to claim 3, characterized in that: The adjustment structure also includes several groups of compression components, which include two gantries. The gantries are fixedly connected to the inner side of the hollow box 2. A movable rod is movably arranged on the outside of the gantry. One end of the movable rod is fixedly connected to the arc plate 2, and a spring 2 is arranged between the other end of the movable rod and the inner side of the gantry.

5. A cable joint voltage detection test device according to claim 1, characterized in that: The front and rear parts of the hollow box 2 are both provided with a plurality of circular holes, and the centers of the circular holes of the hollow box 2 coincide with the centers of the circular holes of the hollow box 1 and the conductive plate at corresponding positions.

6. A cable joint voltage detection test device according to claim 4, characterized in that: The linkage plate is slidably connected to the square hole, and one end of the second arc plate is arranged in a bent and tilted state.

7. A cable joint voltage detection test device according to claim 3, characterized in that: An auxiliary structure is provided on the top of the base, and the auxiliary structure includes two fixed blocks, the fixed blocks are fixedly connected to the base, a cross bar is rotatably provided between the two fixed blocks, a plurality of fixed frames are fixedly provided on the outside of the cross bar, and a sleeve is rotatably provided on the outside of the fixed frame, connecting arm 1 is fixedly provided at both ends of the cross bar, one end of the connecting arm 1 is rotatably connected to connecting arm 2, one end of the connecting arm 2 is rotatably connected to a fixing rod, and the fixing rod and the connecting plate are fixedly connected.

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