Lightning protection detection box convenient to carry
By introducing structures such as mobile pulleys, hidden tracks and connecting arms into the lightning protection detection box, the problems of insufficient portability and protection are solved, and the portability and equipment protection are improved.
Patent Information
- Application Number
- CN202422890340.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-26
Smart Images

Figure CN223371644U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to lightning protection detection, in particular to a lightning protection detection box that is easy to carry. Background Art
[0002] During the use of information equipment, electronic computers and some precision instruments, they are extremely vulnerable to damage from lightning current pulses, so they need to be tested for lightning protection. The lightning protection detection equipment is stored inside the lightning protection detection box.
[0003] The lightning protection detection box needs to be easy for users to move and transfer to other locations so that it is portable and can be carried and used at any time. In addition, the lightning protection detection equipment is relatively expensive and needs to be kept intact inside the detection box to avoid damage from bumps.
[0004] In the process of realizing the present utility model, the inventors found that the existing technology has the following problems: 1. When the traditional lightning protection detection box is used during work, it is necessary to facilitate the user to move the position to improve the portability of the detection box, thereby improving the practicality of the equipment; 2. The traditional lightning protection detection box cannot avoid bumps during transportation and transfer, which may cause damage to the detection equipment inside the detection box, affecting subsequent use and causing a lot of losses. Utility Model Content
[0005] The purpose of the present invention is to provide a portable lightning protection detection box to solve the problems of the traditional lightning protection detection box mentioned in the above background technology, which lacks a portable structure and a device protection structure. To achieve the above purpose, the present invention provides the following technical solutions: a portable lightning protection detection box, comprising a detection box body, a sealing upper cover is provided in a slot on the upper rear side of the detection box body, and a lightning protection detection device is provided in a slot in the middle of the inner side of the detection box body, an intelligent panel is provided in the middle of the upper left side of the lightning protection detection device, and hidden tracks are provided on both sides of the left and right sides of the front middle of the detection box body;
[0006] The left and right sides of the middle part of the rear surface of the upper end of the sealing upper cover are grooved with lifting vertical rods, and the middle part of the upper inclined surface of the lifting vertical rods is grooved with elastic connecting rods, and the upper side of the elastic connecting rods is connected to the lifting handle;
[0007] A rotating knob is slotted in the middle of the bottom end of the left surface of the detection box body, and a chain sprocket set is provided on the right side of the right end of the rotating knob, and a rotating threaded rod is provided on the middle surface of the front and rear ends of the right side of the chain sprocket set, and an adjustment track is provided in the middle of the front and rear sides of the bottom end of the inner wall of the detection box body, a group of rotating connecting arms are provided in the middle of the left and right ends of the rotating threaded rod, and a connecting horizontal plate is provided at the bottom end of the lightning protection detection equipment;
[0008] A traction rod is provided in the middle of the upper front side of the hidden track, and telescopic connecting arms are provided in the middle of the left and right sides of the bottom end of the traction rod. Unlocking buttons are provided in the middle of the left and right end surfaces of the traction rod, and a limiting connecting arm is sleeved on the middle of the bottom end of the telescopic connecting arm. The bottom ends of the telescopic connecting arms are provided with sliding connecting shafts.
[0009] The unlocking button is provided with a sliding ramp rod at one end close to the middle of the traction rod, and locking round buttons are provided on the left and right sides of the bottom end of the sliding ramp rod, and movable pulleys are provided in the middle of the left and right ends of the bottom front side of the detection box body.
[0010] Further preferably, the middle left and right sides of the rear bottom end of the sealing upper cover are rotatably connected to the inner walls of the middle left and right sides of the groove on the upper rear end of the detection box body through a rotating shaft, and the middle bottom end of the lifting vertical rod is slidably connected to the inner wall of the rear groove of the sealing upper cover through a spring, and the middle bottom end of the elastic connecting rod is rotatably connected to the middle part of the inner wall of the upper groove of the lifting vertical rod, and the upper ends of the elastic connecting rods are respectively rotatably connected to the inner walls of the grooves on the left and right ends of the lifting handle.
[0011] Further preferably, the bottom end surface of the adjusting rail is fixed to the middle of the front and rear sides of the bottom end of the inner wall of the inspection box body, and the left and right ends of the rotating threaded rod are bearing-connected to the inner wall of the upper rectangular groove of the adjusting rail, and the left end of the rotating threaded rod is respectively fixed to the middle surfaces of the front and rear sides of the right end of the chain sprocket group, the right end of the rotating knob is fixed to the middle of the left surface of the chain sprocket group, and the middle part of the rotating knob passes through the bearing and is connected to the inner wall of the circular groove on the left side of the inspection box body.
[0012] Further preferably, the middle part of the bottom end of the rotating connecting arm is grooved and threadedly connected to the middle part of the left and right ends of the rotating threaded rod, and the bottom end surface of the rotating connecting arm is slidably connected to the bottom end of the inner wall of the rectangular slide groove of the adjustment track, and the upper end surface of the rotating connecting arm is respectively fixed to the middle part of the four corners of the bottom end surface of the connecting horizontal plate, and the outer side surface of the connecting horizontal plate is slidably connected to the inner wall of the groove in the middle part of the inner side of the detection box body.
[0013] Further preferably, the bottom end of the smart panel is fixed to the middle left side of the inner middle upper end surface of the detection box body by bolts, and the middle right end surface of the lightning protection detection equipment is grooved and connected to the end of the inner right end connection port of the detection box body through a data cable, and a detection antenna is provided in the middle right side of the inner upper end surface of the detection box body.
[0014] Further preferably, the rear end surface of the sliding connecting shaft is fixedly connected to the inner wall of the inner slide groove of the hidden track, and the bottom end of the telescopic connecting arm is rotatably connected to the middle part of the front end of the sliding connecting shaft, and the middle part of the front end of the limiting connecting arm is slotted and fixedly sleeved on the middle part of the bottom end of the telescopic connecting arm, the rear end surface of the limiting connecting arm is slidably connected to the inner wall of the inner slide groove of the hidden track, and the upper end of the telescopic connecting arm is fixed to the middle of the left and right sides of the bottom end of the traction rod.
[0015] Further preferably, the middle part of the unlocking button passes through and is slidably connected to the inner walls of the left and right circular grooves at both ends of the traction rod, and the end of the unlocking button close to the sliding ramp rod is tightly attached to the upper slope surface of the sliding ramp rod through a spring ramp rod, and the middle part of the sliding ramp rod is slidably connected to the inner wall of the telescopic connecting arm by a spring, and the left and right slope surfaces of the bottom end of the sliding ramp rod are respectively tightly attached to the side surface of the locking round button close to the bottom end of the sliding ramp rod, and the middle part of the locking round button passes through and is slidably connected to the inner walls of the left and right circular grooves in the middle of the telescopic connecting arm.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] In the utility model, a movable pulley and a traction rod are provided. By providing movable pulleys at both ends of the left and right front sides of the bottom end of the detection box body, the user can pull the traction rod on the front side of the upper end of the hidden track, and by pulling the traction rod, the telescopic connecting arm is stretched and lengthened, so that the locking round button in the middle of the inner side of the telescopic connecting arm is engaged with the inner wall of the circular groove of the outer telescopic connecting arm. In the process of pulling the traction rod, the user can stretch the limiting connecting arm in the middle of the bottom end of the telescopic connecting arm and make the telescopic connecting arm rotate around the sliding connecting axis of the bottom end.
[0018] In the utility model, a connecting cross plate and an adjustment rail are provided. Two sets of adjustment rails are provided at the bottom end of the inner wall of the detection box main body, and by rotating the rotating knob on the left side, the rotating knob can drive the rotating threaded rod at the right end to rotate through the chain sprocket group on the right side, and then the rotating threaded rod drives the rotating connecting arm in the middle to move through the threaded structure, and then the upper end of the rotating connecting arm supports the upper connecting cross plate to move up, so as to adjust the position of the lightning protection detection equipment in the middle of the inner side of the detection box main body, so as to store the lightning protection detection equipment at the inner bottom end of the detection box main body to avoid bumping and damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;
[0020] Figure 2 This is an enlarged structural diagram of the limiting connecting arm of the utility model;
[0021] Figure 3 This is an enlarged structural diagram of the telescopic connecting arm of the utility model;
[0022] Figure 4 This is an enlarged structural diagram of the connecting horizontal plate of the utility model;
[0023] Figure 5 This is an enlarged structural diagram of the pull handle of the utility model.
[0024] In the figure: 1. Detection box body; 2. Sealing cover; 3. Lightning protection detection equipment; 4. Moving pulley; 5. Smart panel; 6. Hidden track; 7. Tow bar; 8. Unlock button; 9. Telescopic connecting arm; 10. Limit connecting arm; 11. Sliding connecting shaft; 12. Sliding ramp rod; 13. Locking round button; 14. Connecting horizontal plate; 15. Rotating knob; 16. Chain sprocket assembly; 17. Rotating threaded rod; 18. Rotating connecting arm; 19. Adjusting track; 20. Lifting handle; 21. Elastic connecting rod; 22. Lifting vertical rod. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0026] See also Figures 1 to 5 The utility model provides a technical solution: a portable lightning protection detection box, comprising a detection box body 1, a sealing upper cover 2 is provided in a slot on the upper rear side of the detection box body 1, and a lightning protection detection device 3 is provided in a slot in the middle of the inner side of the detection box body 1, an intelligent panel 5 is provided in the middle of the upper left side of the lightning protection detection device 3, and hidden tracks 6 are provided on both sides of the left and right sides of the front middle of the detection box body 1;
[0027] The left and right sides of the middle part of the rear surface of the upper end of the sealing upper cover 2 are grooved with lifting vertical rods 22, and the middle part of the upper inclined surface of the lifting vertical rods 22 is grooved with elastic connecting rods 21, and the upper side of the elastic connecting rods 21 is connected to the lifting handle 20;
[0028] A rotating knob 15 is provided in the middle of the bottom end of the left surface of the detection box body 1, and a chain sprocket set 16 is provided on the right side of the right end of the rotating knob 15. Rotating threaded rods 17 are provided on the middle surfaces of the front and rear ends of the right side of the chain sprocket set 16, and adjustment rails 19 are provided in the middle of the front and rear sides of the bottom end of the inner wall of the detection box body 1. A group of rotating connecting arms 18 are provided in the middle of the left and right ends of the rotating threaded rod 17, and a connecting cross plate 14 is provided at the bottom end of the lightning protection detection equipment 3;
[0029] A traction rod 7 is provided in the middle of the upper front side of the hidden track 6, and telescopic connecting arms 9 are provided in the middle of the left and right sides of the bottom end of the traction rod 7. The middle of the left and right end surfaces of the traction rod 7 are grooved with unlocking buttons 8, and the middle of the bottom end of the telescopic connecting arm 9 is sleeved with a limit connecting arm 10, and the bottom end of the telescopic connecting arm 9 is provided with a sliding connecting shaft 11;
[0030] A sliding ramp rod 12 is provided at one end of the unlocking button 8 near the middle of the traction rod 7, and locking round buttons 13 are provided on both sides of the bottom end of the sliding ramp rod 12, and a movable pulley 4 is provided in the middle of the left and right ends of the bottom front side of the detection box body 1.
[0031] In this embodiment, Figure 5 As shown, the middle left and right sides of the rear bottom end of the sealing upper cover 2 are rotatably connected to the inner walls of the middle left and right sides of the groove on the upper rear end of the detection box body 1 through a rotating shaft, and the middle bottom end of the lifting vertical rod 22 is slidably connected to the inner wall of the rear groove of the sealing upper cover 2 through a spring, and the middle bottom end of the elastic connecting rod 21 is rotatably connected to the middle of the inner wall of the upper groove of the lifting vertical rod 22, and the upper ends of the elastic connecting rod 21 are rotatably connected to the inner walls of the grooves on the left and right ends of the lifting handle 20 respectively; by pulling the lifting handle 20 in the middle of the rear end of the sealing upper cover 2, and pulling the elastic connecting rod 21 by pulling force, the lifting vertical rod 22 is moved up, so that the user's lifting arm is cushioned.
[0032] In this embodiment, Figure 4 As shown, the bottom end surfaces of the adjusting rails 19 are fixed to the middle parts of the front and rear sides of the bottom end of the inner wall of the detection box body 1, and the left and right ends of the rotating threaded rod 17 are bearing-connected to the inner wall of the upper rectangular groove of the adjusting rail 19, and the left ends of the rotating threaded rod 17 are respectively fixed to the middle surfaces of the front and rear sides of the right end of the chain sprocket set 16, the right end of the rotating knob 15 is fixed to the middle part of the left surface of the chain sprocket set 16, and the middle part of the rotating knob 15 passes through the bearing and is connected to the inner wall of the circular groove on the left side of the detection box body 1; by rotating the rotating knob 15 on the left side of the detection box body 1, the rotating knob 15 can drive the rotating threaded rod 17 on the right side to rotate through the chain sprocket set 16, and drive the rotating connecting arm 18 in the middle to slide through the threaded structure.
[0033] In this embodiment, Figure 4As shown, the middle part of the bottom end of the rotating connecting arm 18 is grooved and threadedly connected to the middle part of the left and right ends of the rotating threaded rod 17, and the bottom end surface of the rotating connecting arm 18 is slidably connected to the bottom end of the inner wall of the rectangular slide of the adjusting track 19, and the upper end surface of the rotating connecting arm 18 is respectively fixed to the middle part of the four corners of the bottom end surface of the connecting cross plate 14, and the outer surface of the connecting cross plate 14 is slidably connected to the inner wall of the groove in the middle part of the inner side of the detection box body 1; by connecting the rotating connecting arm 18 to the middle part of the four corners of the bottom end surface of the connecting cross plate 14 on the lower side of the lightning protection detection equipment 3, the rotating connecting arm 18 can be driven by the rotation of the rotating threaded rod 17 to adjust the height position of the upper connecting cross plate 14.
[0034] In this embodiment, Figure 1 As shown, the bottom ends of the smart panels 5 are fixed to the middle left side of the upper surface of the inner middle part of the detection box body 1 by bolts, and the middle part of the right end surface of the lightning protection detection equipment 3 is grooved and connected to the end of the right end connection port of the inner side of the detection box body 1 through a data cable, and a detection antenna is provided in the middle right side of the upper surface of the inner side of the detection box body 1; the lightning protection detection equipment 3, smart panel 5 and antenna to be used for detection are all provided inside the detection box body 1.
[0035] In this embodiment, Figure 2 As shown, the rear end surfaces of the sliding connecting shaft 11 are fixedly connected to the inner wall of the inner groove of the hidden track 6, and the bottom ends of the telescopic connecting arms 9 are rotatably connected to the front end middle part of the sliding connecting shaft 11, and the front end middle part of the limiting connecting arm 10 is slotted and fixedly sleeved on the bottom middle part of the telescopic connecting arm 9, the rear end surfaces of the limiting connecting arm 10 are slidably connected to the inner wall of the inner groove of the hidden track 6, and the upper ends of the telescopic connecting arms 9 are fixed to the middle of the left and right sides of the bottom end of the traction rod 7; by pulling the upper traction rod 7, the traction rod 7 can pull the detection box body 1 through the telescopic connecting arms 9 on both sides, and the rotation angle of the telescopic connecting arm 9 around the sliding connecting shaft 11 can be limited by the limiting connecting arm 10.
[0036] In this embodiment, Figure 3As shown, the middle part of the unlocking button 8 passes through the inner walls of the circular grooves on the left and right ends of the traction rod 7, and the end of the unlocking button 8 close to the sliding ramp rod 12 is tightly attached to the upper slope surface of the sliding ramp rod 12 through the spring ramp rod, and the middle part of the sliding ramp rod 12 is slidably connected to the inner wall of the telescopic connecting arm 9 through a spring sleeve, and the left and right slope surfaces of the bottom end of the sliding ramp rod 12 are respectively tightly attached to the side surface of the locking round button 13 close to the bottom end of the sliding ramp rod 12, and the middle part of the locking round button 13 passes through the inner walls of the circular grooves on the left and right sides of the middle part of the telescopic connecting arm 9; by pressing the unlocking buttons 8 at the left and right ends of the traction rod 7, the unlocking button 8 drives the sliding ramp rod 12 to slide down through the spring ramp rod at the end, and then the locking round button 13 on the bottom side is retracted to the inner side of the telescopic connecting arm 9 under the action of the spring elastic force.
[0037] The use method and advantages of this utility model: When the portable lightning protection detection box is used, the working process is as follows:
[0038] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the user can first open the sealed upper cover 2 on the upper side of the detection box body 1, and rotate the rotating knob 15 on the left side of the detection box body 1, so that the rotating knob 15 can drive the rotating threaded rod 17 inside the right adjustment track 19 to rotate through the chain sprocket set 16, and then drive the middle rotating connecting arm 18 to slide along the inner wall of the slide groove of the adjustment track 19 through the threaded structure, and support the upper connecting horizontal plate 14, thereby adjusting the height position of the lightning protection detection equipment 3 so that the user can control the detection equipment through the smart panel 5;
[0039] When it is necessary to carry and transfer the inspection box body 1, the traction rod 7 can be pulled to make the traction rod 7 drive the telescopic connecting arm 9 on the lower side to stretch, and by pressing the unlocking button 8, the unlocking button 8 drives the sliding ramp rod 12 to move downward through the spring ramp rod, thereby retracting the locking round buttons 13 on both sides into the inside of the telescopic connecting arm 9, and adjusting the length by stretching the telescopic connecting arm 9, and finally locking the length of the telescopic connecting arm 9 by the locking round buttons 13. When the user drags the inspection box body 1, the moving pulley 4 contacts the ground, and the limiting connecting arm 10 in the middle of the bottom end of the telescopic connecting arm 9 will limit the forward tilting angle of the telescopic connecting arm 9 around the sliding connecting shaft 11 at the bottom end of the inner side of the hidden track 6. When the user lifts the sealing upper cover 2, the lifting handle 20 can be pulled, and the elastic connecting rods 21 at both ends of the lifting handle 20 can be used to pull the lifting vertical rod 22 to slide up along the groove of the sealing upper cover 2 to achieve a buffering effect.
[0040] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. A portable lightning protection detection box, comprising a detection box body (1), characterized in that: A sealing upper cover (2) is provided in a slot on the rear side of the upper end of the detection box body (1), and a lightning protection detection device (3) is provided in a slot in the middle of the inner side of the detection box body (1), an intelligent panel (5) is provided in the middle of the upper left side of the lightning protection detection device (3), and hidden tracks (6) are provided on both left and right sides of the middle of the front end of the detection box body (1); The middle of the rear surface of the upper end of the sealing upper cover (2) is grooved on both sides to provide a lifting vertical rod (22), and the middle of the upper inclined surface of the lifting vertical rod (22) is grooved to provide an elastic connecting rod (21), and the upper side of the elastic connecting rod (21) is connected to a lifting handle (20); A rotating knob (15) is provided in a groove in the middle of the bottom end of the left surface of the detection box body (1), and a chain sprocket group (16) is provided on the right side of the right end of the rotating knob (15), and a rotating threaded rod (17) is provided on the middle surface of the front and rear ends of the right side of the chain sprocket group (16), and an adjustment track (19) is provided in the middle of the front and rear sides of the bottom end of the inner wall of the detection box body (1), and a group of rotating connecting arms (18) are provided in the middle of the left and right ends of the rotating threaded rod (17), and a connecting cross plate (14) is provided at the bottom end of the lightning protection detection equipment (3); A traction rod (7) is provided in the middle of the upper front side of the hidden track (6), and telescopic connecting arms (9) are provided in the middle of the left and right sides of the bottom end of the traction rod (7), and unlocking buttons (8) are provided in the middle of the left and right end surfaces of the traction rod (7), and a limiting connecting arm (10) is sleeved on the middle of the bottom end of the telescopic connecting arm (9), and a sliding connecting shaft (11) is provided at the bottom end of the telescopic connecting arm (9); The unlocking button (8) is provided with a sliding ramp rod (12) at one end close to the middle of the traction rod (7), and locking round buttons (13) are provided on both the left and right sides of the bottom end of the sliding ramp rod (12), and movable pulleys (4) are provided at the middle of both the left and right ends of the bottom front side of the detection box body (1).
2. The portable lightning protection detection box according to claim 1, characterized in that: The middle parts of the left and right sides of the rear bottom end of the sealing upper cover (2) are rotatably connected to the inner walls of the left and right middle grooves on the upper rear end of the detection box body (1) through a rotating shaft, and the middle parts of the bottom ends of the lifting vertical rods (22) are slidably connected to the inner walls of the rear grooves of the sealing upper cover (2) through springs, and the middle parts of the bottom ends of the elastic connecting rods (21) are rotatably connected to the middle parts of the inner walls of the upper grooves of the lifting vertical rods (22), and the upper ends of the elastic connecting rods (21) are rotatably connected to the inner walls of the left and right grooves of the lifting handles (20).
3. The portable lightning protection detection box according to claim 1, characterized in that: The bottom end surfaces of the adjustment rail (19) are fixed to the middle of the front and rear sides of the bottom end of the inner wall of the detection box body (1), and the left and right ends of the rotating threaded rod (17) are bearing-connected to the inner wall of the upper rectangular groove of the adjustment rail (19), and the left end of the rotating threaded rod (17) is respectively fixed to the middle surfaces of the front and rear sides of the right end of the chain sprocket group (16), the right end of the rotating knob (15) is fixed to the middle of the left side surface of the chain sprocket group (16), and the middle part of the rotating knob (15) passes through the bearing and is connected to the inner wall of the left circular groove of the detection box body (1).
4. The portable lightning protection detection box according to claim 1, characterized in that: The middle part of the bottom end of the rotating connecting arm (18) is slotted and threadedly connected to the middle part of the left and right ends of the rotating threaded rod (17), and the bottom end surface of the rotating connecting arm (18) is slidably connected to the bottom end of the inner wall of the rectangular sliding groove of the adjusting track (19), and the upper end surface of the rotating connecting arm (18) is respectively fixed to the middle part of the four corners of the bottom end surface of the connecting transverse plate (14), and the outer surface of the connecting transverse plate (14) is slidably connected to the inner wall of the groove in the middle part of the inner side of the detection box body (1).
5. The portable lightning protection detection box according to claim 1, characterized in that: The bottom ends of the smart panels (5) are fixed to the middle left side of the upper surface of the inner middle part of the detection box body (1) by bolts, and the middle right side of the surface of the lightning protection detection equipment (3) is grooved and connected to the end of the inner right side connection port of the detection box body (1) through a data line, and a detection antenna is provided in the middle right side of the upper surface of the inner side of the detection box body (1).
6. The portable lightning protection detection box according to claim 1, characterized in that: The rear end surface of the sliding connection shaft (11) is fixedly connected to the inner wall of the inner groove of the hidden track (6), and the bottom end of the telescopic connection arm (9) is rotatably connected to the middle of the front end of the sliding connection shaft (11), and the middle of the front end of the limiting connection arm (10) is slotted and fixedly sleeved on the middle of the bottom end of the telescopic connection arm (9), the rear end surface of the limiting connection arm (10) is slidably connected to the inner wall of the inner groove of the hidden track (6), and the upper end of the telescopic connection arm (9) is fixed to the middle of the left and right sides of the bottom end of the traction rod (7).
7. The portable lightning protection detection box according to claim 1, characterized in that: The middle part of the unlocking button (8) is slidably connected to the inner walls of the left and right circular grooves of the traction rod (7), and the end of the unlocking button (8) close to the sliding slope rod (12) is tightly attached to the upper slope surface of the sliding slope rod (12) through a spring slope rod, and the middle part of the sliding slope rod (12) is slidably connected to the inner wall of the telescopic connecting arm (9) by being sleeved with a spring, and the left and right slope surfaces of the bottom end of the sliding slope rod (12) are respectively tightly attached to the side surface of the locking circular button (13) close to the bottom end of the sliding slope rod (12), and the middle part of the locking circular button (13) is slidably connected to the inner walls of the left and right circular grooves of the middle part of the telescopic connecting arm (9).