A copper bar type three-phase electric energy metering box

Abstract

This application relates to the technical field of electric energy metering boxes, and discloses a copper bar type three-phase electric energy metering box, which includes a box body. A placement plate is provided inside the box body, and a copper bar for passing through the placement plate is provided on the box body. An installation seat is provided on the placement plate, and a rotating seat is provided on the placement plate. An installation plate is rotatably connected to the rotating seat. The box body 1 is made of metal, such as stainless steel, galvanized iron, aluminum alloy and other metals, and is formed by mechanical processing; or the box body 1 is made of non-metal, such as SMC molding compound, PC, PC+ABS, ASA plastic (acrylonitrile-butadiene-styrene copolymer), PE (polyethylene with glass fiber), PP (polypropylene with glass fiber), and is formed by molding and injection molding processes. In this application, the installation plate is rotatably connected to the rotating seat, so that the installation plate can block the connection between the copper bar and the electric energy meter, so that the installation plate, the installation seat and the rotating seat all block the copper bar, avoiding the risk of electric shock caused by staff directly touching the copper bar.

Description

Technical Field

[0001] This application relates to the technical field of electric energy metering boxes, and particularly to a copper busbar type three-phase electric energy metering box. Background Art

[0002] An electric energy metering box is a device used in a power system to measure and record the electric energy consumption in a three-phase AC circuit. Most of the circuit metering boxes are installed in industrial, commercial, and residential electricity usage scenarios.

[0003] In the related art, an electric energy metering box includes a box body. A placement board is provided inside the box body, and an electric energy meter is provided on the placement board. A copper busbar is provided on the box body, and the copper busbar passes through the placement board and is electrically connected to the electric energy meter.

[0004] During the use of the electric energy metering box, the copper busbar is directly exposed on the outside. If a staff member accidentally touches the copper busbar, some electric shock risks may occur, resulting in a relatively low safety performance of the electric energy metering box. Summary of the Invention

[0005] In order to improve the problem of relatively high electric shock risk of the electric energy metering box, this application provides a copper busbar type three-phase electric energy metering box.

[0006] A copper busbar type three-phase electric energy metering box provided by this application adopts the following technical solutions:

[0007] A copper busbar type three-phase electric energy metering box includes a box body. A placement board is provided inside the box body, and an electric energy meter is provided on the placement board. A copper busbar for passing through the placement board is provided on the box body, and the copper busbar is used for electrically connecting the electric energy meter. An installation seat is provided on the placement board, and a rotating seat is provided on the placement board. An installation board is rotatably connected to the rotating seat; when the installation board abuts against the installation seat, the installation board, the rotating seat, and the installation seat all block the connection between the copper busbar and the electric energy meter.

[0008] By adopting the above technical solutions, the installation board is rotatably connected to the rotating seat, and the installation board abuts against the installation seat, so that the installation board can block the connection between the copper busbar and the electric energy meter, thereby enabling the installation board, the installation seat, and the rotating seat to all block the copper busbar, avoiding direct contact of the staff with the copper busbar and resulting in some electric shock risks, and improving the safety performance of the electric energy metering box.

[0009] Optionally, a protective cover is rotatably connected to the electric energy meter. The protective cover is used for blocking the connection between the electric energy meter and the copper busbar, and a connection hole for the copper busbar to pass through is opened on the protective cover; when the protective cover blocks the connection between the electric energy meter and the copper busbar, the installation board does not block the connection hole.

[0010] By adopting the above technical solution, the connection between the electricity meter and the copper bar is shielded by the protective cover, and the connection holes are not blocked by the mounting plate, enabling the copper bar to be connected to the electricity meter. When the copper bar is connected to the electricity meter, it is not easily interfered by external sundries, making the connection of the electricity meter more stable.

[0011] Optionally, a stop block is provided on the mounting plate, and the stop block is located within the connection hole; when the stop block is within the connection hole, the mounting plate cannot rotate.

[0012] By adopting the above technical solution, with the stop block located within the connection hole, the protective cover can limit the mounting plate. When the protective cover is locked, the hole wall of the connection hole in the protective cover limits the mounting plate, preventing the mounting plate from rotating. The protective cover restricts the rotation of the mounting plate, avoiding the situation where the copper bar leaks out due to the rotation of the mounting plate, and further improving the safety performance of the electricity metering box.

[0013] Optionally, support bars are provided on the placement plate, support grooves for inserting the support bars are formed on the mounting base, and two limit blocks are provided on the groove walls of the support grooves; when the support bars are inserted into the support grooves, the support bars are located between the two limit blocks.

[0014] By adopting the above technical solution, by inserting the support bars into the support grooves and allowing the two limit blocks to abut against the support bars, the mounting base can be stably located on the placement plate, and the mounting base is not likely to shake on the support bars.

[0015] Optionally, a mounting spring is provided on the mounting base, a mounting block is provided on the mounting spring, and a mounting groove for inserting the mounting block is formed on the mounting plate; when the mounting plate abuts against the mounting base, the mounting spring drives the mounting block to insert into the mounting groove.

[0016] By adopting the above technical solution, by driving the mounting block to move with the mounting spring and inserting the mounting block into the mounting groove, the mounting base and the mounting plate can be fixed to each other, reducing the possibility of the mounting plate shaking on the mounting base, and avoiding the situation where the stop block disengages from the connection hole due to the shaking of the mounting plate when locking the protective cover. Thus, the mounting plate is not likely to affect the fixation of the protective cover, and the stop block can be stably located within the connection hole.

[0017] Optionally, the stop block is slidably connected to the mounting plate, a connecting bar is slidably connected to the mounting plate, the connecting bar is located on the moving path of the mounting block, a connecting inclined surface is formed on the connecting bar, the distance between the connecting inclined surface and the electricity meter gradually increases in the direction from the mounting base to the rotating base, and the connecting inclined surface is located on the moving path of the stop block; when the mounting block is inserted into the mounting groove, the mounting block drives the stop block to move through the connecting bar, and the stop block is located within the connection hole.

[0018] By adopting the above technical solution, when the installation block is inserted into the installation groove, since the connecting bar is located on the moving path of the installation block, the installation block drives the connecting bar to move, making the connecting inclined surface located on the moving path of the stop block, so that the connecting bar drives the stop block to move through the connecting inclined surface, thereby enabling the stop block to be inserted into the connecting hole, realizing the limitation of the installation plate by the stop block, and avoiding the situation that the installation plate is not locked on the electric energy meter; when the staff first fixes the protective cover on the electric energy meter, the staff moves the installation plate to fix the installation plate on the protective cover, realizing that the stop block is located in the connecting hole, so that the staff does not need to unlock the protective cover and the electric energy meter and then fix the installation plate, avoiding the need for the staff to rotate the protective cover due to incorrect operation steps, and enabling the fixing of the installation plate to be completed before or after the fixing operation of the protective cover.

[0019] Optionally, a locking bar is rotatably connected to the protective cover, a locking block is provided on the locking bar, a locking groove for inserting the locking bar is formed on the stop block, and a groove for inserting the locking block is formed on the groove wall of the locking groove, and the groove does not penetrate to the surface of the stop block where the locking groove is formed; when the locking block is located in the groove and the stop block is located in the connecting hole, the locking bar and the stop block are fixed to each other.

[0020] By adopting the above technical solution, the staff rotates the locking bar to move the locking block from the locking groove to the groove. Since the groove does not penetrate to the surface of the stop block where the locking groove is formed, the locking block and the stop block can be fixed to each other, avoiding the direct removal of the locking bar from the locking groove, enabling the stop block to be stably located in the protective cover, and realizing the mutual fixation of the protective cover and the installation plate.

[0021] Optionally, the locking groove penetrates to the surface of the stop block away from the installation plate, and a torsion spring is provided on the locking bar, and the torsion spring drives the locking bar to rotate; when the stop block is inserted into the connecting hole, the stop block can drive the locking block to rotate into the locking groove.

[0022] By adopting the above technical solution, when the stop block is inserted into the connecting hole, since the locking groove penetrates to the surface of the stop block away from the installation plate, the locking bar and the locking block can enter the locking groove from the opening where the locking groove penetrates. Since the torsion spring drives the locking bar to rotate, the locking block can move from the locking groove to the groove, realizing the locking of the locking block to the stop block.

[0023] Optionally, a receiving spring is provided on the mounting base. A receiving strip is provided on the receiving spring. A first receiving block and a second receiving block are provided on the receiving strip. The second receiving block can be located on the moving path of the mounting block. A receiving groove for inserting the first receiving block is formed on the support strip. The receiving spring drives the first receiving block to insert into the receiving groove. When the first receiving block is inserted into the receiving groove, the second receiving block is not on the moving path of the mounting block.

[0024] By adopting the above technical solution, the receiving spring is used to drive the movement of the receiving strip, and the second receiving block is used to block the mounting block, so that the second receiving block can limit the protrusion of the mounting block from the mounting base, avoiding damage to the mounting block due to collision during the transportation of the mounting base. When the first receiving block abuts against the receiving groove, the first receiving block drives the second receiving block to move through the receiving strip, so that the second receiving block is not on the moving path of the mounting block, enabling the mounting block to protrude from the mounting base and allowing the mounting block to smoothly abut against the connecting strip. By having the second receiving block located on the moving path of the mounting block, the mounting block will not protrude from the receiving groove during transportation, thus preventing damage to the mounting base during transportation and increasing the service life of the mounting base.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. By rotatably connecting the mounting plate to the rotating seat and making the mounting plate abut against the mounting base, the mounting plate can block the connection part between the copper bar and the electricity meter, thereby shielding the copper bar and preventing staff from directly touching the copper bar and causing some electric shock risks, improving the safety performance of the electric energy metering box.

[0027] 2. By having the stop block located in the connection hole, the protective cover can limit the mounting plate. When the protective cover is locked, the hole wall of the connection hole in the protective cover limits the mounting plate, making it difficult for the mounting plate to rotate, and the protective cover restricts the rotation of the mounting plate, avoiding the situation where the copper bar leaks out due to the rotation of the mounting plate, further improving the safety performance of the electric energy metering box. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of Embodiment 1;

[0029] Figure 2 is a schematic structural diagram highlighting the placement plate in Embodiment 1;

[0030] Figure 3 is an exploded schematic diagram highlighting the mounting plate in Embodiment 1;

[0031] Figure 4 is an exploded schematic diagram highlighting the limit block in Embodiment 1;

[0032] Figure 5It is a schematic structural diagram of the prominent placement board in Embodiment 2;

[0033] Figure 6 It is along Figure 5 A partial cross-sectional view taken along line A-A in

[0034] Figure 7 It is along Figure 5 A partial cross-sectional view taken along line B-B in

[0035] Figure 8 It is a schematic structural diagram of the prominent locking bar in Embodiment 2.

[0036] Reference numerals: 1, box body; 2, placement board; 21, through hole; 22, copper bar; 23, electric energy meter; 24, support bar; 25, protective cover; 251, connection hole; 252, mounting hole; 253, mounting bolt; 254, thread groove; 26, receiving groove; 27, locking bar; 271, locking block; 272, torsion spring; 3, rotating seat; 31, mounting seat; 32, support groove; 321, limiting block; 33, mounting plate; 331, mounting groove; 332, connecting bar; 333, connecting inclined surface; 34, stop block; 341, locking groove; 342, groove; 35, accommodating groove; 351, mounting spring; 352, mounting block; 36, placement groove; 361, accommodating spring; 362, accommodating bar; 363, first accommodating block; 364, second accommodating block. Detailed implementation manners

[0037] The following further elaborates on this application in conjunction with the attached Figure 1-8 drawings.

[0038] Embodiment 1

[0039] This embodiment discloses a copper bar type three-phase electric energy metering box. Refer to Figure 1 and Figure 2 , a copper bar type three-phase electric energy metering box includes a box body 1, and a placement board 2 is provided inside the box body 1. The box body 1 is made of metal, such as stainless steel, galvanized iron, aluminum alloy and other metals, and is formed by mechanical processes; or the box body 1 is made of non-metal, such as SMC molding compound, PC, PC + ABS, ASA plastic (acrylonitrile-butadiene-styrene copolymer), PE (polyethylene plus glass fiber), PP (polypropylene plus glass fiber) and is formed by molding and injection processes.

[0040] Refer to Figure 3 , a plurality of through holes 21 are formed on the placement board 2. A plurality of copper bars 22 are provided on the placement board 2, and the copper bars 22 pass through the through holes 21 and are located on the other side of the placement board 2.

[0041] Refer to Figure 3, A plurality of electric energy meters 23 are fixedly connected to the placement board 2, and the copper busbar 22 and the electric energy meters 23 can be connected to each other. A plurality of rotating seats 3 and a plurality of mounting seats 31 are provided on the placement board 2, and the number of the rotating seats 3 and the mounting seats 31 corresponds one by one. The plurality of rotating seats 3 and the plurality of mounting seats 31 are divided into multiple groups. Each group of rotating seats 3 and mounting seats 31 are respectively located on the left and right sides of the through hole 21, that is, the through hole 21 is located in the middle of each group of rotating seats 3 and mounting seats 31.

[0042] Refer to Figure 3 , A plurality of support bars 24 are fixedly connected to the surface of the placement board 2. The support bars 24 extend along the width direction of the electric energy metering box. The plurality of support bars 24 are arranged in an array along the length direction of the electric energy metering box, and the through hole 21 penetrates to the surface of the support bars 24.

[0043] Refer to Figure 3 and Figure 4 , Support grooves 32 for inserting the support bars 24 are formed on the surfaces of the mounting seats 31 and the rotating seats 3. Two limit blocks 321 are fixedly connected to the groove walls of the support grooves 32. The limit blocks 321 have the ability of elastic deformation. One limit block 321 is located on the groove wall of the support groove 32, and the other limit block 321 is located on the opposite groove wall of the support groove 32. When the support bar 24 is located in the support groove 32, both limit blocks 321 abut against the support bar 24, so that the mounting seat 31 or the rotating seat 3 can be fixed on the support bar 24.

[0044] Refer to Figure 3 , A mounting plate 33 is rotatably connected to the surface of the rotating seat 3, and the mounting plate 33 can abut against the mounting seat 31. A stop block 34 is fixedly connected to the surface of the mounting plate 33. A protective cover 25 is rotatably connected to the electric energy meter 23, and the protective cover 25 is used to block the connection between the electric energy meter 23 and the copper busbar 22. A connection hole 251 for inserting the stop block 34 is formed on the surface of the protective cover 25, and the copper busbar 22 passes through the connection hole 251. When the mounting plate 33 abuts against the mounting seat 31, the staff rotates the protective cover 25 to make the stop block 34 located at the connection hole 251, so as to realize the limitation of the protective cover 25 on the mounting plate 33.

[0045] Refer to Figure 3 , Mounting holes 252 are formed on the surface of the protective cover 25. Mounting bolts 253 are arranged in the mounting holes 252. Threaded grooves 254 for threaded connection of the mounting bolts 253 are formed on the electric energy meter 23. When the mounting bolts 253 pass through the mounting holes 252 and the mounting bolts 253 are threadedly connected in the threaded grooves 254, the protective cover 25 is fixed on the electric energy meter 23.

[0046] The implementation principle of Embodiment 1 is as follows: First, the staff rotates the mounting plate 33 to make the mounting plate 33 abut against the mounting seat 31. Then, the staff rotates the protective cover 25 and rotates the mounting bolt 253 to realize the limitation of the protective cover 25 by the mounting bolt 253.

[0047] Embodiment 2

[0048] Refer to Figure 5 and Figure 6 In this embodiment, the difference from Embodiment 1 is that a receiving groove 35 is formed on the surface of the mounting seat 31. A mounting spring 351 is fixedly connected to the bottom wall of the receiving groove 35, and a mounting block 352 is fixedly connected to the surface of the mounting spring 351 away from the bottom wall of the receiving groove 35. A mounting groove 331 for inserting the mounting block 352 is formed on the surface of the mounting plate 33, and the mounting groove 331 extends along the length direction of the mounting plate 33.

[0049] Refer to Figure 6 A connecting strip 332 is slidably connected in the mounting groove 331. The connecting strip 332 slides along the length direction of the mounting groove 331, and the connecting strip 332 is located on the insertion path of the mounting block 352. A connecting inclined surface 333 is formed on the surface of the connecting strip 332 away from the mounting seat 31. The stop block 34 is slidably connected to the mounting plate 33. The distance between the connecting inclined surface 333 and the electricity meter 23 gradually decreases along the direction from the rotating seat 3 to the adjacent mounting seat 31, and the connecting inclined surface 333 is located on the moving path of the stop block 34.

[0050] Refer to Figure 6 When the mounting plate 33 abuts against the mounting seat 31, the mounting spring 351 drives the mounting block 352 to insert into the mounting groove 331. The mounting block 352 abuts against the connecting strip 332 to move, so that the connecting strip 332 drives the stop block 34 to move through the connecting inclined surface 333, and the stop block 34 is inserted into the connecting hole 251.

[0051] Refer to Figure 6 and Figure 7, a placement groove 36 communicating with the accommodation groove 35 is formed on the surface of the mounting base 31. Two accommodation springs 361 are fixedly connected in the placement groove 36, and an accommodation strip 362 is provided in the placement groove 36. One end of the accommodation spring 361 is fixedly connected to the inner wall of the placement groove 36, and the other end of the accommodation spring 361 is fixedly connected to the accommodation strip 362. A first accommodation block 363 and a second accommodation block 364 are fixedly connected to the surface of the accommodation strip 362 away from the accommodation spring 361. The first accommodation block 363 is located on the side of the second accommodation block 364 away from the placement plate 2. The first accommodation block 363 is located on the movement path of the mounting block 352, and the accommodation spring 361 drives the first accommodation block 363 to limit the mounting block 352 from protruding out of the accommodation groove 35. An accommodation groove 26 for inserting the second accommodation block 364 is formed on the surface of the support strip 24. When the support strip 24 is located in the support groove 32, the first accommodation block 363 can be inserted into the accommodation groove 26, and at this time the accommodation spring 361 is in a compressed state. When the first accommodation block 363 blocks the opening of the accommodation groove 35, the first accommodation block 363 limits the mounting block 352 from protruding out of the accommodation groove 35, and at this time the accommodation spring 361 is in a non-loaded state.

[0052] Referring to Figure 6 and Figure 7 , when the mounting base 31 is mounted on the support strip 24, the accommodation spring 361 drives the second accommodation block 364 to be inserted into the accommodation groove 26. At this time, the first accommodation block 363 is not on the movement path of the mounting block 352, allowing the mounting block 352 to smoothly protrude out of the accommodation groove 35.

[0053] Referring to Figure 6 and Figure 8 , a locking strip 27 is rotatably connected to the surface of the protective cover 25. A locking block 271 is fixedly connected to the outer surface of the locking strip 27. A torsion spring 272 is fixedly connected to the surface of the locking strip 27, and the torsion spring 272 drives the locking strip 27 to rotate. A locking groove 341 is formed on the surface of the stop block 34 away from the placement plate 2. The locking groove 341 penetrates to the surface of the stop block 34 away from the mounting plate 33, and the locking groove 341 is for inserting the locking strip 27 and the locking block 271. A groove 342 for inserting the locking block 271 is formed on the groove wall of the locking groove 341. The groove 342 does not penetrate to the surface of the stop block 34 away from the placement plate 2, and the groove 342 does not penetrate to the surface of the stop block 34 facing the electricity meter 23.

[0054] Referring to Figure 6 and Figure 8 , when the locking strip 27 is located in the locking groove 341, the torsion spring 272 drives the locking strip 27 to rotate, so that the locking block 271 moves from the locking groove 341 to the groove 342, realizing the limit of the locking strip 27 on the stop block 34.

[0055] The implementation principle of Embodiment 2 is as follows: First, the staff rotates the mounting plate 33 to make the mounting plate 33 abut against the mounting seat 31, so that the mounting block 352 is inserted into the mounting groove 331, and the mounting block 352 drives the stop block 34 to protrude through the connecting bar 332. Then, the staff rotates the protective cover 25 to insert the locking bar 27 into the locking groove 341, and the torsion spring 272 drives the locking bar 27 to rotate, so that the locking block 271 is inserted into the groove 342.

[0056] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the field to which this application belongs. The terms "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "a" or "an" and similar terms do not denote a limitation of quantity, but mean that there is at least one. The terms "comprising" or "including" and similar terms are intended to cover the elements or items listed after the word "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0057] The above are only the preferred embodiments of this application and are not used to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the design concept of this application shall be included within the protection scope of this application.

Claims

1. A copper busbar type three-phase electric energy meter box, comprising a box body (1), a placement plate (2) is provided in the box body (1), an electric energy meter (23) is provided on the placement plate (2), a copper busbar (22) is provided on the box body (1) for passing through the placement plate (2), and the copper busbar (22) is used to electrically connect the electric energy meter (23), characterized in that: The placement plate (2) is provided with a mounting seat (31), the placement plate (2) is provided with a rotating seat (3), and the rotating seat (3) is rotatably connected to a mounting plate (33); when the mounting plate (33) abuts against the mounting seat (31), the mounting plate (33), the rotating seat (3) and the mounting seat (31) all shield the connection between the copper busbar (22) and the electric energy meter (23); A protective cover (25) is rotatably connected to the electric energy meter (23), the protective cover (25) being used to shield the connection between the electric energy meter (23) and the copper busbar (22), and a connection hole (251) is provided on the protective cover (25) for the copper busbar (22) to pass through; when the protective cover (25) shields the connection between the electric energy meter (23) and the copper busbar (22), the mounting plate (33) does not block the connection hole (251); A stop block (34) is provided on the mounting plate (33), and the stop block (34) is located in the connecting hole (251); when the stop block (34) is located in the connecting hole (251), the mounting plate (33) cannot rotate; The placement plate (2) is provided with a support bar (24), the mounting seat (31) is provided with a support groove (32) for inserting the support bar (24), and the groove wall of the support groove (32) is provided with two limit blocks (321); when the support bar (24) is inserted into the support groove (32), the support bar (24) is located between the two limit blocks (321); The mounting seat (31) is provided with a mounting spring (351), the mounting spring (351) is provided with a mounting block (352), and the mounting plate (33) is provided with a mounting groove (331) for inserting the mounting block (352); when the mounting plate (33) abuts against the mounting seat (31), the mounting spring (351) drives the mounting block (352) to be inserted into the mounting groove (331).

2. A copper busbar type three-phase electric energy meter box according to claim 1, characterized in that: The stop block (34) is slidably connected to the mounting plate (33), a connecting strip (332) is slidably connected to the mounting plate (33), the connecting strip (332) is located on the moving path of the mounting block (352), a connecting inclined surface (333) is provided on the connecting strip (332), the distance between the connecting inclined surface (333) and the electric energy meter (23) gradually increases along the direction from the mounting seat (31) to the rotating seat (3), and the connecting inclined surface (333) is located on the moving path of the stop block (34); when the mounting block (352) is inserted into the mounting groove (331), the mounting block (352) drives the stop block (34) to move through the connecting strip (332), and the stop block (34) is located in the connecting hole (251).

3. A copper busbar type three-phase electric energy meter box according to claim 1, characterized in that: The protective cover (25) is rotatably connected with a locking bar (27), the locking bar (27) is provided with a locking block (271), the stop block (34) is provided with a locking groove (341) for the locking bar (27) to be inserted, the groove wall of the locking groove (341) is provided with a groove (342) for the locking block (271) to be inserted, and the groove (342) does not penetrate to the surface of the stop block (34) on which the locking groove (341) is provided; when the locking block (271) is located in the groove (342) and the stop block (34) is located in the connecting hole (251), the locking bar (27) and the stop block (34) are fixed to each other.

4. A copper busbar type three-phase electric energy meter box according to claim 3, characterized in that: The locking groove (341) penetrates to the surface of the stop block (34) away from the mounting plate (33); a torsion spring (272) is provided on the locking bar (27); the torsion spring (272) drives the locking bar (27) to rotate; when the stop block (34) is inserted into the connecting hole (251), the stop block (34) can drive the locking block (271) to rotate into the locking groove (341).

5. The copper busbar type three-phase electric energy meter box according to claim 1 is characterized in that: The mounting seat (31) is provided with a receiving spring (361), the receiving spring (361) is provided with a receiving bar (362), the receiving bar (362) is provided with a first receiving block (363) and a second receiving block (364), the second receiving block (364) can be located on the moving path of the mounting block (352), the support bar (24) is provided with a receiving groove (26) for inserting the first receiving block (363), the receiving spring (361) drives the first receiving block (363) to be inserted into the receiving groove (26); when the first receiving block (363) is inserted into the receiving groove (26), the second receiving block (364) is not located on the moving path of the mounting block (352).

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