A laser pipeline positioning device for electromechanical pipeline installation based on BIM

Abstract

The present invention provides a laser pipeline positioning device for electromechanical pipeline installation based on BIM, which relates to the technical field of pipeline positioning, and comprises a back plate and an adjusting disk, wherein the adjusting disk is arranged on the back plate, a magnetic attraction interlayer is arranged in the plate, the adjusting disk is made of magnetic material and can be attracted by the magnetic attraction interlayer, and a center point fixing seat is arranged at the center of the adjusting disk, an annular vertical plate is also arranged on the adjusting plate around the center point fixing seat, an annular sliding groove is formed between two adjacent annular vertical plates, two sliding parts are arranged in each annular slide groove, the sliding part comprises a circular base and a support rod, a rotating part is also arranged on the support rod, and the rotating part can rotate on the support rod. Compared with the prior art, the present invention has the following beneficial effects: due to the existence of the magnetic attraction interlayer in the back plate, and the adjusting disk and the sliding part are both made of magnetic attraction materials, the sliding part will not fall off the adjusting disk or be easily offset, and the use is convenient and the structure is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline positioning, and in particular to a laser pipeline positioning device for electromechanical pipeline installation based on BIM. Background Art

[0002] BIM, or Building Information Model, is a new tool for architecture, engineering and civil engineering. The term Building Information Model or Building Information Model was created by Autodesk to describe computer-aided designs that are mainly based on three-dimensional graphics, object-oriented, and related to architecture. With the acceleration of the pace of national infrastructure construction, the mechanical and electrical installation period is tight and the quality requirements are high. The installation time of pipelines and brackets in equipment area corridors, complex pipeline areas, etc. is limited. The positioning of pipelines and brackets has become the focus of mechanical and electrical installation construction. Therefore, a pipeline positioning device is needed. A laser pipeline positioning device for mechanical and electrical pipeline installation based on BIM is retrieved with publication number CN115560132A, including an ultra-wide intelligent laser transmitter, a vertical plate is arranged on the top surface of the ultra-wide intelligent laser transmitter, a lifting clamp is arranged on the surface of the vertical plate, a shield is arranged on the surface of the lifting clamp, and a cleaning member is installed on the surface of the shield to clean the driving rod body of the lifting clamp.

[0003] However, in the above technology, after the device is fixed by a lifting clamp, the laser transmitter is used to locate the pipeline, and the position of the laser transmitter cannot be moved or changed, resulting in the need to frequently move the device during use in order to locate pipelines in different positions. Summary of the invention

[0004] The problem to be solved by the present invention is that, without changing the position of the overall equipment, pipelines at multiple different positions can be positioned simultaneously.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a laser pipeline positioning device for BIM-based electromechanical pipeline installation, comprising a back plate and an adjustment disk, the back plate is rectangular, the adjustment disk is circular, the adjustment disk is arranged on the back plate, a rectangular frame is arranged around the back plate, a magnetic interlayer is arranged in the back plate, the adjustment disk is made of magnetic material and can be attracted by the magnetic interlayer, and a center fixing seat is arranged at the center of the adjusting disk, an annular vertical plate is arranged around the center fixing seat on the adjusting plate, an annular sliding groove is formed between two adjacent annular vertical plates, two sliding members are arranged in each annular slide groove, the sliding member comprises a circular base and a support rod, a rotating member is also arranged on the support rod, the rotating member can rotate on the support rod, and a rotating member is also arranged on the center fixing seat, an auxiliary hole and a calibration hole are also arranged on the side wall of the rotating member, a laser emitter is arranged on the top of the rotating member, the rotating member can be positioned through the auxiliary hole and the calibration hole, and then the electromechanical pipeline is positioned through the laser emitter, and the sliding member is also made of magnetic material.

[0006] More preferably, the rectangular frame includes a left panel, a right panel, a bottom panel and a top panel, wherein the height of the right panel is greater than that of the left panel, and the height of the top panel is greater than that of the bottom panel.

[0007] More preferably, a vertical slide is provided on the left panel, a rectangular slider is provided in the vertical slide, an infrared transmitter is provided on the top of the rectangular slider, an indicator needle is provided on the side wall of the rectangular slider, and a through hole is provided on the rectangular slider.

[0008] More preferably, a transverse slide is provided on the bottom panel, two transverse sliding blocks are provided in the transverse slide, the transverse sliding blocks are made of magnetic material, an infrared transmitter is provided on the top of the transverse sliding block, and an indicator needle is provided on the side wall of the transverse sliding block.

[0009] More preferably, a threaded screw is provided in the vertical slideway on the left panel, the threaded screw can rotate in the vertical slideway, the rectangular slider is sleeved on the threaded screw, and the rotation of the threaded screw can drive the rectangular slider to move up and down in the vertical slideway.

[0010] More preferably, a connecting end is provided at the lower end of the threaded screw rod, the connecting end is a "+" type, and the connecting end passes through the left side panel and is connected to a knob.

[0011] More preferably, a limit tooth is provided on the knob, and a limit slot is provided below the left panel, the limit slot matches the limit tooth, and after the knob drives the limit tooth to insert into the limit slot, the knob cannot rotate.

[0012] More preferably, a receiving groove is provided on the back plate, an auxiliary positioning rod is provided in the receiving groove, and the auxiliary positioning rod is made of magnetic material.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: by moving the sliding member in the annular sliding groove in the adjusting disk, according to the number of pipes to be positioned, the corresponding number of sliding members are toggled, and then the height of the rectangular slider is determined according to the position of the centimeter scale line where the indicator needle on the rectangular slider in the vertical slideway on the left panel is located, and the height of the rectangular slider is adjusted according to the needs, and then the auxiliary positioning rod is inserted into the through hole in the rectangular slider, and then the auxiliary positioning rod is inserted into the auxiliary hole in the sliding member, and then the infrared light emitted by the infrared transmitter on the rectangular slider passes through the calibration hole on the sliding member and irradiates the centimeter scale line on the right panel, thereby realizing the positioning and calibration of the sliding member, and then After that, the laser transmitter on the sliding part is turned on to perform laser positioning on the pipeline, and the spacing between the sliding parts can be measured according to the transverse sliding block in the transverse slide and the infrared transmitter on its top. If the measured spacing does not meet the requirements, the sliding parts in other annular sliding grooves can be replaced, or the annular vertical plate can be directly removed to achieve the free movement of the sliding parts, and then the height of the rectangular slider and the spacing of the transverse slider can be adjusted according to the needs to position the sliding parts. Due to the presence of the magnetic interlayer in the back plate and the fact that the adjusting disk and the sliding part are both made of magnetic materials, the sliding part will not fall off the adjusting disk or shift easily. It is easy to use and has a simple structure, is easy to carry, and has a lower production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention in a storage state;

[0015] Figure 2 It is a schematic diagram of the structure of the receiving tank of the present invention;

[0016] Figure 3 It is a schematic diagram of the vertical slide structure of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the transverse slideway of the present invention;

[0018] Figure 5 It is a schematic diagram of the knob structure of the present invention;

[0019] Figure 6 It is a schematic diagram of the rectangular slider structure of the present invention;

[0020] Figure 7 It is a schematic diagram of the structure of the sliding member of the present invention;

[0021] Figure 8 It is a schematic diagram of the structure of the present invention in use state;

[0022] Fig. 9 It is a schematic diagram of the top view structure of the present invention;

[0023] Among them, 1-back plate, 2-adjusting disk, 3-center fixing seat, 4-rotating part, 5-annular vertical plate, 6-annular sliding groove, 7-sliding part, 8-circular base, 9-support rod, 10-laser emitter, 11-left panel, 12-right panel, 13-bottom panel, 14-top panel, 15-horizontal slide, 16-vertical slide, 17-rectangular slider, 18-transverse slider, 19-infrared emitter, 20-indicator needle, 21-cm scale line, 22-threaded screw, 23-connecting end, 24-knob, 25-limiting groove, 26-limiting tooth, 27-through hole, 28-auxiliary hole, 29-calibration hole, 30-auxiliary positioning rod, 31-accommodating groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be an electrical connection; it can be a hydraulic oil circuit connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] See also Figures 1 to 9As shown, a laser pipeline positioning device for electromechanical pipeline installation based on BIM includes a back plate 1, an adjusting disk 2 and a laser emitter 10. The back plate 1 is rectangular, and the adjusting disk 2 is arranged on the back plate 1. The adjusting disk 2 is circular. A center fixing seat 3 is arranged at the center of the front end of the adjusting disk 2. The center fixing seat 3 is circular. A rotating member 4 is arranged on the center fixing seat 3. The rotating member 4 can rotate on the center fixing seat 3. A laser emitter 10 is arranged on the rotating member 4. An annular vertical plate 5 is arranged around the center fixing seat 3 on the adjusting disk 2. The annular vertical plate 5 is detachably connected to the adjusting disk 2. An annular sliding groove 6 is formed between two adjacent annular vertical plates 5. The annular sliding groove 6 is annular. The number of the annular sliding grooves 6 is multiple. The annular sliding groove 6 is coaxial with the central axis of the adjusting disk 2. Since the widths of the annular vertical plates 5 are the same, every two adjacent annular sliding The radius difference of the moving groove 6 is the same, that is, the spacing between every two adjacent annular sliding grooves 6 is the same. The cross-sectional shape of the annular sliding groove 6 is a "convex" shape. Two sliding members 7 are arranged in each annular sliding groove 6. The sliding member 7 includes a circular base 8 and a support rod 9. The circular base 8 is located in the annular sliding groove 6, and the circular base 8 can move in the annular sliding groove 6. The support rod 9 is arranged at the center of the circular base 8. The height of the top of the support rod 9 is not lower than the side wall of the annular sliding groove 6. The support rod 9 is connected to a rotating member 4 that is the same as that on the center fixing seat 3. The rotating member 4 can rotate on the support rod 9. The laser emitter 10 is arranged at the center position of the rotating member 4. The circular base 8 can drive the support rod 9 and the rotating member 4 to move, and the rotating member 4 drives the laser emitter 10 to move, thereby controlling and changing the position of the laser emitter 10.

[0028] A rectangular frame is also arranged around the back panel 1, and the rectangular frame is located outside the adjusting disk 2. The rectangular frame is composed of four side panels, namely a left panel 11, a right panel 12, a bottom panel 13 and a top panel 14. A vertical slide 16 is arranged on the left panel 11, and a horizontal slide 15 is arranged in the bottom panel 13. A rectangular slider 17 is arranged in the vertical slide 16, and the rectangular slider 17 can move up and down in the vertical slide 16, but the rectangular slider 17 cannot rotate in the vertical slide 16, and two horizontal sliding sliders 18 are arranged in the horizontal slide 15 in the bottom panel 13, and the horizontal sliding slider 18 can move in the horizontal slide 15 but cannot rotate, and infrared transmitters 19 are arranged on the rectangular slider 17 and the horizontal sliding slider 18, and indicator needles 20 are also arranged on the rectangular slider 17 and the horizontal sliding slider 18. Centimeter scale lines 21 are provided on the upper surface. The height of the infrared emitter 19 can be determined by the position of the indicator needle 20 on the left panel 11 on the centimeter scale lines 21. The distance between the infrared emitters 19 on the two transverse sliding blocks 18 can be determined by controlling the indicator needle 20 to cooperate with the centimeter scale lines 21 on the two transverse sliding blocks 18. In addition, the height of the right panel 12 in the rectangular frame is greater than that of the left panel, and the height of the top panel 14 is greater than that of the bottom panel 13, so that the infrared light emitted by the infrared emitter 19 is irradiated on the inner wall of the right panel 12 and the top panel 14; in addition, centimeter scale lines 21 are also provided on the side walls of the right panel 12 and the top panel 14, so that when the infrared emitter 19 is turned on, the infrared light can be irradiated on the centimeter scale lines 21 on the inner wall of the right panel 12 and the top panel 14.

[0029] A threaded screw 22 is also provided in the vertical slide 16 on the left side panel 11. The upper end of the threaded screw 22 is movably connected to the top panel 14 so that the threaded screw 22 can rotate. The threaded screw 22 passes through the rectangular slider 17 on the left side panel 11. When the threaded screw 22 rotates, it can drive the rectangular slider 17 to move up and down in the vertical slide 16. A "+"-shaped connecting end 23 is provided at the lower end of the threaded screw 22. A positioning kit is inserted into the connecting end 23. The positioning kit includes a knob 24 and a limiting groove 25. The knob 24 is circular. A "+"-shaped socket matching the connecting end 23 is provided at the center of the knob 24. The connecting end 23 of the threaded screw 22 is inserted into the knob In the socket 24, a limiting tooth 26 is provided on the outer circumferential surface of the knob 24, and a limiting groove 25 is provided on the lower end surface of the left side panel 11. After the threaded screw 22 passes through the limiting groove 25, it is connected to the knob 24 through the connecting end 23. The limiting groove 25 matches the limiting tooth 26, so that after the limiting tooth 26 is inserted into the limiting groove 25, the knob 24 is limited, so that the knob 24 cannot be rotated, thereby controlling the threaded screw 22 to be unable to rotate, and then the rectangular slider 17 mounted on the threaded screw 22 cannot move up and down. Pulling the knob 24 out of the limiting groove 25 and then rotating the knob 24 can control the threaded screw 22 to rotate, thereby driving the rectangular slider 17 to move up and down in the vertical slide 16.

[0030] A through hole 27 is also provided in the rectangular slider 17. The through hole 27 penetrates the rectangular slider 17 horizontally from left to right. The through hole 27 is a circular hole. The center line of the through hole 27 and the center line of the infrared emitter 19 are located on the same straight line. An auxiliary hole 28 and a calibration hole 29 are provided on the rotating member 4 of the sliding member 7. The calibration hole 29 is located above the auxiliary hole 28. The calibration hole 29 is a circular hole. The cross section of the calibration hole 29 is a "+" type. The auxiliary hole 28 is circular. The height of the calibration hole 29 is on the same plane as the infrared emitter 19. The auxiliary hole 28 has the same aperture as the through hole 27. The auxiliary hole 28 and the through hole 27 are located at the same horizontal height. An auxiliary positioning rod 30 is inserted into the auxiliary hole 28 and the through hole 27. The auxiliary positioning rod 30 is a cylindrical rod. A handle is also provided at the end of the auxiliary positioning rod 30. When the auxiliary positioning rod 30 is inserted into the auxiliary hole 28 and the through hole 27, the infrared emitter 19 on the rectangular slider 17 is turned on. At this time, the infrared light will pass through the calibration hole 29 and then shine on the centimeter scale line 21 on the right side panel 12. At this time, the transverse slider 18 is adjusted to drive the infrared emitter 19 to move, so that the light beam emitted by the infrared emitter 19 on the transverse slider 18 also passes through the calibration hole 29 and shines on the centimeter scale line 21 on the top panel 14. According to needs, the transverse slider 18 can be driven by the pointer to adjust to the required spacing distance, and then the position of the sliding member 7 can be adjusted so that the calibration hole 29 on the rotating member 4 is penetrated by the light beam emitted by the infrared emitter 19 to achieve the adjustment of the spacing.

[0031] A receiving groove 31 is also provided on the back plate 1, and the auxiliary positioning rod 30 can be placed in the receiving groove 31 after being pulled out, and a magnetic interlayer is provided inside the back plate 1, and the magnetic interlayer is a ferrite magnet, and the auxiliary positioning rod 30 is a magnetic material that can be attracted by the magnetic interlayer, so that the auxiliary positioning rod 30 can be adsorbed in the receiving groove 31, and when in use, it is only necessary to manually pinch the handle to take the auxiliary positioning rod 30 out of the receiving groove 31, and the adjustment disk 2, the sliding member 7 and the transverse sliding block 18 are all made of magnetic materials, and the above-mentioned magnetic material can be iron or nickel-iron alloy and other materials that can be attracted by the magnetic interlayer, and the magnetic interlayer can be magnetically attracted by the magnetic material through the characteristics of the magnetic material. The sliding member 7 is then moved to the adjusting disk 2 and then the adjusting disk 2 absorbs the sliding member 7, so that the sliding member 7 will not move easily on the adjusting disk 2. An external force needs to be manually applied to move the sliding member 7 on the adjusting disk 2. After the sliding member 7 is moved to the specified position, the movement is stopped. The sliding member 7 will be positioned at the current position without deviation. The transverse slider 18 cannot move easily in the transverse slide 15. An external force needs to be manually applied to move the transverse slider 18 laterally in the transverse slide 15. After the transverse slider 18 is manually adjusted to the specified position, the transverse slider 18 will not be affected by external factors such as vibration or shaking, causing the transverse slider to deviate from the specified position.

[0032] When in use, first adjust the position of the rectangular slider 17 in the vertical slideway 16 in the left panel 11 as needed, first pull the knob 24 at the lower end of the threaded screw 22 out of the limiting groove 25, then manually control the knob 24 to rotate, thereby driving the threaded screw 22 to rotate, so that the rectangular slider 17 moves in the vertical slideway 16, and observe the indicator needle 20 on the rectangular slider 17 moving on the centimeter scale line 21. When the indicator needle 20 moves to the specified position on the centimeter scale line 21, stop turning the knob 24 and push the knob 24 upward to make the limiting tooth 26 on the knob 24 enter the limiting groove 25, thereby limiting the threaded screw 22, making the threaded screw 22 unable to rotate, thereby driving the rectangular slider 17 unable to move in the vertical slideway 16, so that the rectangular slider 17 can not ... The rectangular slider 17 is fixed at the specified position, and then the infrared transmitter 19 on the rectangular slider 17 is turned on to irradiate the infrared beam to the centimeter scale line 21 on the right panel 12. Then, according to the number of pipelines to be positioned, the sliding member 7 on the adjusting disk 2 is toggled to move the sliding member 7 to the height of the rectangular slider 17, and then the movement is stopped. At this time, since the sliding member 7 is made of magnetic material, it will be attracted by the magnetic interlayer in the back plate 1 and will not be easily offset. At this time, the auxiliary positioning rod 30 is taken out from the receiving groove 31 on the back plate 1, and the auxiliary positioning rod 30 is inserted into the through hole 27 in the rectangular slider 17, and then the rotating member 4 in the sliding member 7 is rotated to make the auxiliary positioning rod 30 pass through the auxiliary hole 28 on the rotating member 4, so that the rotating member 4 and the rectangular slider 17 are aligned. The rectangular sliders 17 are located at the same height, and at this time, the light beam emitted by the infrared transmitter 19 on the rectangular slider 17 will pass through the calibration hole 29 on the rotating member 4 and illuminate the centimeter scale line 21 on the right panel 12, thereby realizing the positioning and calibration of the slider 7. At this time, the transverse slider 18 is controlled to move in the transverse slide 15, and the infrared transmitter 19 on the transverse slider 18 is turned on, so that the infrared light beam passes through the calibration hole 29 on the rotating member 4 and illuminates the centimeter scale line 21 on the top panel 14. The distance between the two sliders 7 can be measured by the transverse slider, thereby obtaining the distance between the two laser transmitters 10. If the transverse distance needs to be adjusted, the sliders 7 in the other annular sliding grooves 6 are moved to adjust them to the appropriate Height, and insert the auxiliary positioning rod 30, and then perform infrared calibration, and then turn on the laser transmitter 10 to realize the positioning of the electromechanical pipeline. If multi-point and multi-directional positioning is required at the same time, it is only necessary to pull out the auxiliary positioning rod 30. Due to the effect of the magnetic interlayer, the calibrated sliding member 7 will not be offset, and then repeat the above steps to re-realize the positioning calibration at other heights. It can simply and quickly realize laser positioning at different points, and the operation is simple and easy to use. After use, the auxiliary positioning rod 30 is put back into the positioning groove, making the whole device more convenient to carry. In addition, since the annular stand plate 5 is detachably connected, the annular stand plate 5 can also be disassembled for use. After the annular stand plate 5 is disassembled, the movement of the sliding member 7 will be unrestricted, and the degree of freedom is higher.However, it is equivalent to losing the auxiliary positioning function, so it needs to be calibrated multiple times when used again, and the operations required during use are more cumbersome. You can choose the usage method according to the specific situation.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A laser pipeline positioning device for electromechanical pipeline installation based on BIM, comprising a back plate and an adjustment disk, the back plate is rectangular, the adjustment disk is circular, the adjustment disk is arranged on the back plate, and a rectangular frame is arranged around the back plate, characterized in that: The rectangular frame includes a left panel, a right panel, a bottom panel and a top panel, wherein the height of the right panel is greater than that of the left panel, and a vertical slide is provided on the left panel, a rectangular slider is provided in the vertical slide, an infrared transmitter is provided on the top of the rectangular slider, an indicator needle is provided on the side wall of the rectangular slider, and a through hole is provided on the rectangular slider, the height of the top panel is greater than that of the bottom panel, a transverse slide is provided on the bottom panel, two transverse sliders are provided in the transverse slide, an infrared transmitter is provided on the top of the transverse slider, an indicator needle is provided on the side wall of the transverse slider, and the transverse slider is made of a magnetic material; A magnetic interlayer is provided in the back plate, the adjustment disk is made of magnetic material and can be attracted by the magnetic interlayer, and a center fixing seat is provided at the center of the adjustment disk, and an annular vertical plate is also provided on the adjustment plate around the center fixing seat, and an annular sliding groove is formed between two adjacent annular vertical plates, and two sliding parts are provided in each annular slide groove, and the sliding part includes a circular base and a support rod, and a rotating part is also provided on the support rod, and the rotating part can rotate on the support rod, and a rotating part is also provided on the center fixing seat, and an auxiliary hole and a calibration hole are provided on the side wall of the rotating part, and a laser emitter is provided on the top of the rotating part, and the rotating part can be positioned through the auxiliary hole and the calibration hole, and then the electromechanical pipeline can be positioned through the laser emitter, and the sliding part is also made of magnetic material.

2. According to the BIM-based laser pipeline positioning device for electromechanical pipeline installation according to claim 1, it is characterized by: A threaded screw is arranged in the vertical slideway on the left panel, and the threaded screw can rotate in the vertical slideway. The rectangular slider is sleeved on the threaded screw, and the rotation of the threaded screw can drive the rectangular slider to move up and down in the vertical slideway.

3. According to the BIM-based laser pipeline positioning device for electromechanical pipeline installation according to claim 2, it is characterized by: The lower end of the threaded screw is provided with a connecting end, which is a "+" type. The connecting end passes through the left side panel and is connected to a knob.

4. According to claim 3, a laser pipeline positioning device for BIM-based electromechanical pipeline installation is characterized in that: The knob is provided with a limiting tooth, and a limiting slot is provided below the left panel. The limiting slot matches the limiting tooth. After the knob drives the limiting tooth to be inserted into the limiting slot, the knob cannot be rotated.

5. According to the BIM-based laser pipeline positioning device for electromechanical pipeline installation according to claim 1, it is characterized by: The back plate is provided with a receiving groove, an auxiliary positioning rod is provided in the receiving groove, and the auxiliary positioning rod is made of magnetic attraction material.

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