LED lamp mounting rack and LED lamp

Abstract

The application relates to the field of LED lamps and discloses an LED lamp mounting rack which comprises a mounting rack, two clamping blocks for achieving elastic clamping are symmetrically arranged on the two sides of the mounting rack, a mounting disc bayonet is arranged on the side corresponding to each other of the two clamping blocks, a through groove is arranged on the clamping block, the through groove is communicated with the inside of the mounting disc bayonet, a pullable plug-in rod is arranged in the through groove, the LED lamp is clamped by the mounting disc bayonet, then the LED lamp is fixed by the plug-in rod, the LED lamp mounting rack and the LED lamp are fixed on the wall top by bolts penetrating through the waist holes, then the mounting disc is connected by the clamping assembly, and the connection of the whole lamp and the mounting rack can be completed, which is simple, fast and convenient.

Description

Technical Field

[0001] This invention relates to the field of LED lights, specifically to an LED light mounting bracket and an LED light. Background Technology

[0002] When installing existing LED lights, due to their light weight, a cross-shaped thin-walled sheet metal bracket is usually fixed to the ceiling. The bracket is first fixed to the ceiling with expansion screws, and then the base plate of the LED light is connected to the bracket. For example, Chinese Patent: CN202211150050.9, "An LED Light Mounting Frame and LED Light", describes an LED light mounting frame that specifically includes a frame body, clamping blocks, and telescopic sliders. The frame body includes multiple slides, each with a strip-shaped mounting hole. Two opposing clamping blocks are slidably installed in each slide, and telescopic sliders are installed at the ends of each slide and can slide along the slide. The top of the telescopic slider can slide out of the end of the slide, and a pressure plate is provided at the lower end of the telescopic slider. The pressure plate can rotate along the vertical axis of the telescopic slider. The beneficial effects of this invention are that by pre-installing screws on the ceiling and fixing the frame to the ceiling by clamping the screws with clips slidably installed on the slide rail, the mounting frame can be quickly installed to the ceiling. Similarly, by using telescopic sliders slidably installed on the edge of the slide rail to clamp the side lamp cover and using a pressure plate to hook the light-emitting plate, the light-emitting plate is fixed. Finally, the lamp base cover is snapped onto the side lamp cover to install the LED light. The above-mentioned patent requires a large number of bolts for fixing during installation, which is inconvenient during installation and disassembly. Therefore, we propose an LED light mounting frame and an LED light. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides an LED lamp mounting bracket and an LED lamp, thus solving the aforementioned problems.

[0005] (II) Technical Solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an LED light mounting bracket, comprising a mounting frame, wherein two clamping blocks for elastic clamping are mirror-arranged on both sides of the mounting frame, and a mounting plate slot is provided on one side of the two clamping blocks corresponding to each other. A through groove is provided on the clamping block, the through groove connecting to the interior of the mounting plate slot, and a pull-out plug-in rod is provided inside the through groove. The LED light is clamped by the mounting plate slot, and then the LED light is plugged in and fixed by the plug-in rod.

[0007] Preferably, the mounting bracket has a through notch, and T-shaped guide rods are fixedly installed on the inner walls of both sides of the notch. A spring is sleeved on one end of the guide rod near the inner wall of the notch. A slider is slidably connected to the guide rod. The slider fits against the inner walls of both sides of the notch, and the slider is fixedly connected to one end of the spring. The slider is also fixedly connected to the locking block.

[0008] Preferably, side grooves are provided on the inner walls of both sides of the through groove, and tension springs are fixedly installed inside the side grooves. A sliding protrusion is integrally formed on the plug rod corresponding to the position of the side groove. The sliding protrusion is slidably engaged with the side groove. The tension spring pulls the sliding protrusion to keep one end of the plug rod always extending into the inside of the mounting plate slot.

[0009] Preferably, the mounting bracket has a first rectangular groove on both sides, and a through hole is formed on the inner wall of the first rectangular groove.

[0010] Preferably, an LED light is snapped onto the bottom of the mounting bracket via a snap-fit ​​assembly. The LED light includes a housing connecting plate, a mounting plate, a side cover, an LED light source board, and a lampshade. The mounting plate has a slot for being snapped onto by the snap-fit ​​assembly. The housing connecting plate is fixedly installed below the mounting plate. A side cover is integrally formed on one side of the housing connecting plate. The LED light source board is snapped onto the housing connecting plate via a fixing structure. The lampshade is threaded onto the outer side of the side cover.

[0011] Preferably, multiple sets of circular recesses are formed on the bottom wall of the outer casing connecting plate, and multiple sets of magnets are fixedly installed on one side of the LED light source board corresponding to the circular recesses. Metal that can be attracted by the magnets is fixedly installed inside the circular recesses.

[0012] Preferably, the fixing structure includes a circular connecting block fixedly mounted on the outer casing connecting plate, multiple sets of LED light source board pressing blocks, a rotating extrusion structure, and a locking component. The circular connecting block, the outer casing connecting plate, and the mounting plate all have through holes for the power cord to pass through. The power cord passes through the through holes and is electrically connected to the LED light source board. The locking component is used to lock the position of the rotating extrusion structure and is located in the through holes on the circular connecting block. The rotating extrusion structure is located at the bottom of the circular connecting block. The circular connecting block has multiple sets of arc-shaped openings, and the LED light source board pressing blocks are hinged inside the arc-shaped openings via torsion springs. The circular connecting block has an annular groove, and the lower end of the rotating extrusion structure extends into the annular groove. The LED light source board pressing blocks have an integrally formed arc-shaped protrusion corresponding to the rotating extrusion structure. There is a gap between the LED light source board pressing blocks and the inner wall of the outer casing connecting plate, and this gap is the same as the thickness of the LED light source board.

[0013] Preferably, the rotating extrusion structure includes a circular rotating block and an extrusion rod. The circular rotating block and the extrusion rod are fixedly connected together, and one end of the extrusion rod extending into the annular groove corresponds to the position of the arc-shaped protrusion. An arc-shaped groove is provided on the end face of the circular connecting block, and an arc-shaped locking protrusion is provided on one side of the circular rotating block corresponding to the arc-shaped groove. The arc-shaped locking protrusion is rotatably locked together with the arc-shaped groove.

[0014] Preferably, the locking assembly includes a second spring and a limiting rod. A second rectangular groove is provided on the inner wall of the through hole of the circular connecting block. The second spring is fixedly installed inside the second rectangular groove. One end of the second spring is fixedly connected to the limiting rod. Two rectangular locking holes are provided on the circular rotating block at the position corresponding to the limiting rod. The included angle between the centers of the two rectangular locking holes is 30 degrees.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides an LED lamp mounting bracket and an LED lamp, which have the following beneficial effects: 1. The LED light mounting bracket and LED light are fixed to the wall top by bolts passing through the waist holes. Then, the mounting plate is snapped in place using the snap-fit ​​component, which completes the connection between the light fixture and the mounting bracket. It is simple, quick and convenient.

[0017] 2. When installing the LED light mounting bracket and LED light, align the LED light source board with the inside of the side cover, and then align the magnet with the circular recess so that the magnet attracts the metal inside. Due to the presence of the circular recess, the magnet can be prevented from rotating freely. Then, use the fixing structure to lock the LED light source board and keep it fixed in the vertical direction to achieve the overall installation, which is simple and quick.

[0018] 3. When the LED light mounting bracket and LED light need to fix the LED light source board, place the LED light source board on the outside of the circular connecting block, rotate the circular rotating block 30 degrees, and the pressing rod presses the arc-shaped protrusion, so that one side of the LED light source board pressing block extends to the outside of the arc-shaped opening. The LED light source board pressing block presses the inside of the LED light source board to prevent the LED light source board from falling vertically. Then, use the locking component to lock the position of the circular rotating block so that the circular rotating block cannot be rotated at will. This device is simple and quick to install, disassemble and replace the LED light source board, and is easy to use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 BB cross-sectional diagram in the middle; Figure 4 for Figure 3 A magnified view of part A in the diagram; Figure 5 for Figure 3 A magnified view of part C in the diagram; Figure 6 This is a side view of the present invention; Figure 7 for Figure 6 Schematic diagram of section II in the middle; Figure 8 for Figure 7 A magnified view of part D in the diagram; Figure 9 for Figure 6 EE sectional view diagram; Figure 10 for Figure 9 A magnified view of part F in the diagram; Figure 11 This is a cross-sectional view of the circular connecting block.

[0020] In the diagram: 1. Mounting bracket; 2. Housing connecting plate; 3. Mounting plate; 4. Side cover; 5. LED light source board; 6. Magnet; 7. Lampshade; 8. Insertion slot; 9. Notch; 10. Guide rod; 11. Spring 1; 12. Slider; 13. Locking block; 14. Insertion rod; 15. Mounting plate bayonet; 16. Circular connecting block; 17. Annular groove; 18. Arc-shaped opening; 19. LED light source board pressing block; 20. Circular rotating block; 21. Extrusion rod; 22. Second rectangular groove; 23. Spring 2; 24. Limiting rod; 25. Rectangular locking port; 26. First rectangular groove; 27. Waist hole; 28. Side groove; 29. ​​Sliding protrusion; 30. Tension spring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-11 An LED light mounting bracket includes a mounting bracket 1. Two spring-loaded clamping blocks 13 are mirror-arranged on both sides of the mounting bracket 1. A mounting plate slot 15 is opened on one side of the two clamping blocks 13 corresponding to each other. A through slot is opened on the clamping block 13, which connects to the interior of the mounting plate slot 15. A pull-out plug-in rod 14 is arranged inside the through slot. The LED light is clamped by the mounting plate slot 15, and then the LED light is plugged in and fixed by the plug-in rod 14.

[0023] Furthermore, the mounting bracket 1 has a through notch 9. T-shaped guide rods 10 are fixedly installed on the inner walls of both sides of the notch 9. A spring 11 is sleeved on one end of the guide rod 10 near the inner wall of the notch 9. A slider 12 is slidably connected to the guide rod 10. The slider 12 fits against the inner walls of both sides of the notch 9, and one end of the slider 12 is fixedly connected to the spring 11. The slider 12 is also fixedly connected to the locking block 13.

[0024] Furthermore, side grooves 28 are provided on the inner walls of both sides of the through groove. A tension spring 30 is fixedly installed inside the side groove 28. A sliding protrusion 29 is integrally formed on the plug rod 14 corresponding to the position of the side groove 28. The sliding protrusion 29 is slidably engaged with the side groove 28. The tension spring 30 pulls the sliding protrusion 29 to keep one end of the plug rod 14 always extending into the interior of the mounting plate slot 15.

[0025] Furthermore, the mounting bracket 1 has a first rectangular groove 26 on both sides, and a through waist hole 27 is provided on the inner wall of the first rectangular groove 26.

[0026] Furthermore, an LED light is snapped onto the lower part of the mounting bracket 1 via a snap-fit ​​assembly. The LED light includes a housing connecting plate 2, a mounting plate 3, a side cover 4, an LED light source board 5, and a lampshade 7. The mounting plate 3 has a slot 8 for snapping onto the mounting bracket. The housing connecting plate 2 is fixedly installed below the mounting plate 3. A side cover 4 is integrally formed on one side of the housing connecting plate 2. The LED light source board 5 is snapped onto the housing connecting plate 2 via a fixing structure. The lampshade 7 is threaded onto the outer side of the side cover 4. The mounting bracket 1 is fixed to the top of the wall using bolts passing through the waist hole 27. Then, the mounting plate 3 is snapped onto the mounting bracket using the snap-fit ​​assembly, thus completing the connection between the entire light fixture and the mounting bracket. This is simple, quick, and convenient. In summary, when actually snapping onto the mounting plate 3 using the snap-fit ​​assembly, first slide the locking blocks 13 to the opposite sides. At this time, the spring 11 contracts. Then, the distance between the two locking blocks 13 is greater than the diameter of the mounting plate 3. Then, align the position of the mounting plate 3 with the mounting plate latch 15, release your hand, and the spring 11 will rebound. The latches 13 on both sides will slide towards each other, and then the side of the latch 13 will engage with the mounting plate latch 15. At this time, the side of the latch 13 will press the insertion rod 14, realizing the active stretching of the tension spring 30. The end of the insertion rod 14 that extends into the mounting plate latch 15 will be pushed out. Then rotate the mounting plate 3. When the position of the insertion slot 8 on the mounting plate 3 corresponds to the insertion rod 14, the tension spring 30 will pull back, and the insertion rod 14 will engage with the latch 13, thus completing the engagement with the mounting plate 3. When disassembly is required, first pull the insertion rod 14 to the outside of the latch 13, then rotate the mounting plate 3. Then slide the mounting plate latches 15 on both sides towards each other until the mounting plate 3 can be released from the engagement state of the mounting plate latches 15, and the LED light can be disassembled.

[0027] Furthermore, multiple sets of circular recesses are formed on the bottom wall of the outer casing connecting plate 2. Multiple sets of magnets 6 are fixedly installed on one side of the LED light source board 5 corresponding to the circular recesses. Metal that can be attracted by the magnets 6 is fixedly installed inside the circular recesses. When installing the magnets 6, the LED light source board 5 is aligned with the inside of the side cover 4, and then the magnets 6 are aligned with the circular recesses, so that the magnets 6 attract the metal inside. Due to the existence of the circular recesses, the magnets 6 can be prevented from rotating at will. Then, the LED light source board 5 is locked in place by the fixing structure to keep it fixed in the vertical direction, thus realizing the overall installation, which is simple and quick.

[0028] Furthermore, the fixing structure includes a circular connecting block 16 fixedly mounted on the outer casing connecting plate 2, multiple sets of LED light source board pressing blocks 19, a rotating pressing structure, and a locking component. The circular connecting block 16, the outer casing connecting plate 2, and the mounting plate 3 all have through holes for the power cord to pass through. The power cord passes through the through holes and is electrically connected to the LED light source board 5. The locking component is used to lock the position of the rotating pressing structure and is located in the through hole on the circular connecting block 16. The rotating pressing structure is located at the bottom of the circular connecting block 16. The circular connecting block 16 has multiple sets of arc-shaped openings 18. The interior of the arc-shaped openings 18... An LED light source board pressing block 19 is hinged by a torsion spring. An annular groove 17 is provided on the circular connecting block 16. The lower end of the rotating extrusion structure extends into the interior of the annular groove 17. The LED light source board pressing block 19 is integrally formed with an arc-shaped protrusion corresponding to the rotating extrusion structure. There is a gap between the LED light source board pressing block 19 and the inner wall of the outer casing connecting plate 2. This gap is the same as the thickness of the LED light source board 5. When the LED light source board pressing block 19 is not being extruded, under the action of the torsion spring, the LED light source board pressing block 19 retracts into the interior of the arc-shaped opening 18, and the arc-shaped protrusion extends into the interior of the annular groove 17.

[0029] Furthermore, the rotating extrusion structure includes a circular rotating block 20 and an extrusion rod 21. The circular rotating block 20 and the extrusion rod 21 are fixedly connected together, and one end of the extrusion rod 21 extending into the annular groove 17 corresponds to the position of the arc-shaped protrusion. An arc-shaped groove is provided on the end face of the circular connecting block 16. An arc-shaped locking protrusion is provided on one side of the circular rotating block 20 corresponding to the arc-shaped groove. The arc-shaped locking protrusion and the arc-shaped groove are rotatably locked together. When it is necessary to fix the LED light source board 5, the LED light source board 5 is placed on the outside of the circular connecting block 16, and the circular rotating block 20 is rotated 30 degrees. The extrusion rod 21 extrudes the arc-shaped protrusion, so that one side of the LED light source board pressing block 19 extends to the outside of the arc-shaped opening 18. The LED light source board pressing block 19 presses the inside of the LED light source board 5 to prevent the LED light source board 5 from falling vertically. Then, the position of the circular rotating block 20 is locked by the locking component, so that the circular rotating block 20 cannot be rotated at will. This device is simple and quick to install, disassemble and replace the LED light source board 5, and is easy to use.

[0030] Furthermore, the locking assembly includes a second spring 23 and a limiting rod 24. A second rectangular groove 22 is provided on the inner wall of the through hole of the circular connecting block 16. The second spring 23 is fixedly installed inside the second rectangular groove 22, and one end of the second spring 23 is fixedly connected to the limiting rod 24. The circular rotating block 20 has two rectangular locking holes 25 at the position corresponding to the limiting rod 24. The included angle between the centers of the two rectangular locking holes 25 is 30 degrees. When the LED light source board pressing block 19 is not compressed, under the action of the torsion spring, the LED light source board pressing block 19 retracts into the arc-shaped opening 18. Inside, the arc-shaped protrusion extends into the annular groove 17. The limiting rod 24 corresponds to one of the rectangular locking ports 25, achieving a locking engagement. When the circular rotating block 20 needs to be rotated, the limiting rod 24 is first squeezed. After the limiting rod 24 is no longer locked to the rectangular locking port 25, the circular rotating block 20 is rotated to squeeze the LED light source board pressing block 19. The position of the limiting rod 24 will then correspond to the other rectangular locking port 25. Subsequently, the spring 23 rebounds, and the limiting rod 24 engages with it, thus fixing the position of the circular rotating block 20 after squeezing the LED light source board pressing block 19.

[0031] Working principle: The mounting bracket 1 is fixed to the top of the wall using bolts passing through the waist hole 27. Then, the mounting plate 3 is snapped into place using the snap-fit ​​assembly. When snapping the mounting plate 3 into place, the locking blocks 13 are first slid to opposite sides, at which point the spring 11 contracts. Then, the distance between the two locking blocks 13 is greater than the diameter of the mounting plate 3. Next, the position of the mounting plate 3 is aligned with the mounting plate latch 15, and the hand is released. Then, the spring 11 rebounds, and the locking blocks 13 on both sides slide to the side closer to each other. Then, the side of the locking block 13 engages with the mounting plate latch 15. At this time, the side of the locking block 13 presses against the insertion rod 14, realizing the pull. When the spring 30 is actively stretched, the end of the plug rod 14 that extends into the mounting plate slot 15 is pushed out. Then, the mounting plate 3 is rotated. When the position of the plug groove 8 on the mounting plate 3 corresponds to the plug rod 14, the tension spring 30 is pulled back, and the plug rod 14 engages with the locking block 13, thus completing the engagement with the mounting plate 3. When disassembly is required, first pull the plug rod 14 to the end outside the locking block 13, then rotate the mounting plate 3. At this time, slide the mounting plate slots 15 on both sides to opposite sides until the mounting plate 3 can be released from the engagement state of the mounting plate slots 15, thus completing the disassembly of the LED light.

[0032] When installing magnet 6, align LED light source board 5 with the inside of side cover 4, and then align magnet 6 with the circular recess so that magnet 6 attracts the metal inside. Due to the presence of the circular recess, magnet 6 can be prevented from rotating freely. Then, the fixing structure is used to lock LED light source board 5. The LED light source board 5 is placed on the outside of the circular connecting block 16. The circular rotating block 20 is rotated 30 degrees. When the circular rotating block 20 needs to be rotated, the limiting rod 24 is first squeezed. After the limiting rod 24 is no longer engaged with the rectangular locking hole 25, the squeezing rod 21 squeezes the arc-shaped protrusion, so that one side of the LED light source board pressing block 19 extends to the outside of the arc-shaped opening 18. The LED light source board pressing block 19 presses the inside of the LED light source board 5 to prevent the LED light source board 5 from falling vertically. After the circular rotating block 20 is rotated to squeeze the LED light source board pressing block 19, the position of the limiting rod 24 will correspond to another rectangular locking hole 25. Then the spring 23 rebounds, and the limiting rod 24 engages with it, thus fixing the position of the circular rotating block 20 after squeezing the LED light source board pressing block 19.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LED lamp mounting bracket, comprising a mounting bracket (1), characterized in that, The mounting bracket (1) has two locking blocks (13) on both sides for elastic clamping. The two locking blocks (13) have mounting plate slots (15) on their corresponding sides. The locking blocks (13) have through slots that connect to the interior of the mounting plate slots (15). A pull-out plug rod (14) is provided inside the through slot. The LED light is clamped by the mounting plate slots (15), and then the LED light is plugged in and fixed by the plug rod (14). The mounting bracket (1) has a through notch (9). A T-shaped guide rod (10) is fixedly installed on the inner walls of both sides of the notch (9). A spring (11) is sleeved on one end of the guide rod (10) near the inner wall of the notch (9). A slider (12) is slidably connected on the guide rod (10). The slider (12) fits against the inner walls of both sides of the notch (9), and the slider (12) is fixedly connected to one end of the spring (11). The slider (12) is fixedly connected to the locking block (13). Side grooves (28) are provided on the inner walls of both sides of the through groove. A tension spring (30) is fixedly installed inside the side groove (28). A sliding protrusion (29) is integrally formed on the plug rod (14) corresponding to the side groove (28). The sliding protrusion (29) is slidably engaged with the side groove (28). The tension spring (30) pulls the sliding protrusion (29) to keep one end of the plug rod (14) always extending into the mounting plate slot (15). An LED light is attached to the bottom of the mounting bracket (1) by a snap-fit ​​assembly. The LED light includes a housing connecting plate (2), a mounting plate (3), a side cover (4), an LED light source board (5), and a lampshade (7). The mounting plate (3) has a slot (8) for being snapped into by the snap-fit ​​assembly. The housing connecting plate (2) is fixedly installed below the mounting plate (3). A side cover (4) is integrally formed on one side of the housing connecting plate (2). The LED light source board (5) is snapped into the housing connecting plate (2) by a fixing structure. The lampshade (7) is threadedly connected to the outer side of the side cover (4).

2. The LED lamp mounting bracket according to claim 1, characterized in that: The mounting bracket (1) has a first rectangular groove (26) on both sides, and a through waist hole (27) is provided on the inner wall of the first rectangular groove (26).

3. The LED lamp mounting bracket according to claim 1, characterized in that: Multiple sets of circular recesses are opened on the bottom wall of the outer casing connecting plate (2). Multiple sets of magnets (6) are fixedly installed on one side of the LED light source board (5) corresponding to the circular recesses. Metal that can be attracted by the magnets (6) is fixedly installed inside the circular recesses.

4. The LED lamp mounting bracket according to claim 1, characterized in that: The fixing structure includes a circular connecting block (16) fixedly mounted on the outer casing connecting plate (2), multiple sets of LED light source board pressing blocks (19), a rotating pressing structure, and a locking component. The circular connecting block (16), the outer casing connecting plate (2), and the mounting plate (3) are all provided with through holes for the power cord to pass through. The power cord passes through the through holes and is electrically connected to the LED light source board (5). The locking component is used to lock the position of the rotating pressing structure. The locking component is set in the through hole on the circular connecting block (16), and the rotating pressing structure is set at the bottom of the circular connecting block (16). The circular connecting block (16) has multiple sets of arc-shaped openings (18). The inside of the arc-shaped openings (18) is hinged to the LED light source board pressing block (19) by a torsion spring. The circular connecting block (16) has an annular groove (17). The lower end of the rotating extrusion structure extends into the annular groove (17). The LED light source board pressing block (19) is integrally formed with an arc-shaped protrusion corresponding to the rotating extrusion structure. There is a gap between the LED light source board pressing block (19) and the inner wall of the outer shell connecting plate (2). The gap is the same as the thickness of the LED light source board (5).

5. The LED lamp mounting bracket according to claim 4, characterized in that: The rotating extrusion structure includes a circular rotating block (20) and an extrusion rod (21). The circular rotating block (20) and the extrusion rod (21) are fixedly connected together, and one end of the extrusion rod (21) extending into the annular groove (17) corresponds to the position of the arc-shaped protrusion.

6. The LED lamp mounting bracket according to claim 4, characterized in that: The locking assembly includes a second spring (23) and a limiting rod (24). A second rectangular groove (22) is provided on the inner wall of the perforation of the circular connecting block (16). The second spring (23) is fixedly installed inside the second rectangular groove (22). One end of the second spring (23) is fixedly connected to the limiting rod (24). The circular rotating block (20) has two rectangular locking ports (25) at the position corresponding to the limiting rod (24). The included angle between the centers of the two rectangular locking ports (25) is thirty degrees.

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