High-temperature-resistant connector of communication transmission equipment

Abstract

The invention relates to the technical field of communication transmission connectors, and particularly discloses a high-temperature-resistant connector of communication transmission equipment, which comprises a male plug and a female plug, a pull block drives a pull rod to move, meanwhile, a first spring is deformed, the pull rod drives a transmission rack to rotate, the transmission rack drives a transmission gear to rotate, and the male plug and the female plug are connected. When the female plug is connected with the male plug, the connecting block is inserted into the connecting groove, then the pull block is loosened, the deformation of the first spring is recovered, and the embedded block is inserted into the embedded hole, so that the female plug is fixedly connected with the male plug. The connection stability between the male plug and the female plug is enhanced, external force interference such as vibration and impact can be effectively resisted, the phenomenon of connection looseness is reduced, stable transmission of communication signals is ensured, and the system communication quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of communication transmission connectors, in particular to a high temperature resistant connector for communication transmission equipment. Background Art

[0002] As an electronic component for the transmission and exchange of electric current or optical signals between electronic system devices, connectors are the basic elements necessary for the connection of the entire system. With the rapid development of the Internet and mobile communication technology, connector technology has further evolved. The popularization of high-speed data transmission, wireless technology and portable devices has prompted connectors to develop in the direction of high speed, high density and miniaturization. In order to meet the growing performance requirements and cope with complex and changing usage environments, high-temperature resistant connectors are a highlight. With their excellent heat resistance, they effectively extend the service life of connectors under extreme temperature conditions and greatly broaden the application areas of connectors.

[0003] For example, a Chinese patent with publication number CN210074332U discloses a high-temperature resistant connector for communication transmission equipment, including a male plug and a female plug, wherein a slot is provided inside the male plug, an insert is provided inside the slot, an inward groove is provided at the edge of the slot, a first outer baffle is provided on the outer side of the inward groove, first connecting holes are fixedly connected to both sides of the first outer baffle, and a second outer baffle is fixedly connected to the upper end of the female plug.

[0004] Although the above-mentioned public patent solves the problem that the communication transmission equipment may be placed in a harsh environment and exposed to the threat of high temperature, and the electrical connector itself generates heat when in use, which is easy to be damaged due to heat accumulation, there are still some defects that need to be improved. The heat dissipation effect of relying solely on materials is poor, and it cannot ensure that the heat generated by the internal circuit is fully dissipated, which limits the stability of the equipment under high-load operation. In addition, the existing male and female plugs are not reliable and stable enough. When facing complex external forces such as vibration and impact, they are prone to loosening, which will not only affect the stable transmission of signals, but also may cause connection failure, and have an adverse effect on the performance and reliability of the entire communication system. When conducting daily inspections, staff often find it difficult to quickly and accurately determine whether the connector has a loose problem, which not only greatly increases the complexity and time-consuming nature of the inspection work, but also invisibly increases the system risk caused by potential faults not being discovered in time. Summary of the invention

[0005] The object of the present invention is to provide a high temperature resistant connector for communication transmission equipment to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a high-temperature resistant connector for a communication transmission device, including a male plug and a female plug. Heat-conducting gaskets are fixedly connected inside both the male plug and the female plug. Heat-radiating fins are fixedly connected to the outer surfaces of both the male plug and the female plug. Heat-dissipating components are provided on both the male plug and the female plug. Connecting grooves are formed on both sides inside the female plug. An embedding hole is formed on one side of the connecting groove. A connecting block is inserted into the connecting groove. An embedding block is fixedly connected to one side of the connecting block. The embedding block is movably connected to the embedding hole. A driving mechanism is provided on one side of the male plug. The embedding block is fixedly connected to the embedding hole through the driving mechanism. A transmission mechanism is provided on one side of the female plug. One side of the embedding block is movably connected to one side of the transmission mechanism. An LED lamp is fixedly connected to the top of the female plug.

[0007] Further, the heat-dissipating component includes a first air hole, which is formed on the male plug and the female plug on the side of the heat-radiating fins. A first waterproof and breathable membrane is installed inside the first air hole. A connecting rod is fixedly connected to the bottom end of the first waterproof and breathable membrane. A heat-dissipating fan is fixedly connected to the bottom end of the connecting rod. Second air holes are formed on the sides of the male plug and the female plug away from the first air hole. A second waterproof and breathable membrane is installed inside the second air holes.

[0008] Further, the driving mechanism includes a transmission gear, which is rotatably connected to one side of the male plug through a shaft rod. Transmission racks are meshed and connected to both sides of the transmission gear. A limiting component is provided on one side inside the male plug. The transmission rack is slidably connected to the inside of the male plug through the limiting component. One side of the transmission rack is fixedly connected to one side of a connecting plate.

[0009] Further, a pull rod is fixedly connected to the side of one of the transmission racks away from the transmission gear. A first spring is sleeved and fixedly connected to one side of the pull rod. The side of the first spring away from the transmission rack is fixedly connected to the inner wall of the male plug. The side where the pull rod slides out of the male plug is fixedly connected to a pull block.

[0010] Further, the limiting component includes a guiding frame, which is fixedly connected to the inside of the male plug. A sliding rod is fixedly connected to one side of the guiding frame. A guiding block is slidably connected to the outer surface of the sliding rod. One side of the guiding block is fixedly connected to one side of the transmission rack.

[0011] Further, a docking groove is formed on the side of the female plug away from the LED lamp. A docking block is fixedly connected to the side of the male plug away from the driving mechanism. The docking block is movably connected to the docking groove.

[0012] Furthermore, the transmission mechanism includes an installation groove which is opened inside the female plug and communicates with the embedding hole. A second spring is fixedly connected inside the installation groove. One side of the second spring is fixedly connected with a transmission block. One side of the transmission block close to the second spring is fixedly connected with a conductive column. A conductive block is fixedly connected on one side of the installation groove close to the conductive column. One side of the conductive column is movably connected with one side of the conductive block. Limiting grooves are opened on both sides inside the installation groove. One side of the transmission block is slidably connected with the limiting groove.

[0013] Furthermore, a fixing block is fixedly connected on one side of the male plug close to the pulling block. A third spring is fixedly connected inside the fixing block. The top of the third spring is fixedly connected with a pushing block. One end of the pushing block away from the third spring is fixedly connected with a limiting rod. One side of the limiting rod is movably connected with the pulling block.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] Firstly, in the present invention, the heat inside the female plug and the male plug is transferred to the heat dissipation fins through the heat conduction pad. The heat is quickly discharged through the trough formed by the heat dissipation fins, and the heat dissipation can be accelerated through the heat dissipation component. At the same time, water vapor will not enter to erode the circuit during heat dissipation, ensuring the safe and efficient heat dissipation of the connector, ensuring that the heat generated by the internal circuit can be dissipated in time and fully, effectively reducing the working temperature of the plug, avoiding performance degradation or failure caused by overheating, and maintaining a stable electrical connection in a high-temperature environment, thereby significantly improving the stability of the device during high-load operation.

[0016] Secondly, in the present invention, the pulling block drives the pull rod to move, and at the same time deforms the first spring. The pull rod drives a transmission rack to rotate, the transmission rack drives a transmission gear to rotate, thereby driving another transmission rack to move. The connection block is driven to move through the transmission rack, and the connection block drives the embedding block to move. After the female plug and the male plug are connected, the connection block is inserted into the connection groove, and then the pulling block is released. At this time, the first spring returns to its original shape, and the embedding block is inserted into the embedding hole, fixing the connection between the female plug and the male plug, enhancing the connection stability between the male plug and the female plug, effectively resisting external force interference such as vibration and impact, reducing the connection loosening phenomenon, ensuring the stable transmission of communication signals, and improving the communication quality of the system.

[0017] Thirdly, in the present invention, after the female plug and the male plug are connected, when the embedding block enters the embedding hole, it will push the transmission block to move, the transmission block pushes the conductive column to move, and when the conductive column contacts the conductive block, the circuit is connected, and at this time, the LED lamp lights up as a signal of successful connection. Once the female plug and the male plug are loosened and separated, the conductive column and the conductive block are disconnected, and the LED lamp goes out, so as to timely discover and handle the problem of connector looseness, which can effectively avoid system shutdown caused by potential faults not being discovered in time, significantly reduce the risks caused by system faults, and ensure the stable operation of the communication system. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural view of the present invention;

[0019] Figure 2 is a schematic cross-sectional structural view of the female plug and the male plug in the present invention;

[0020] Figure 3 is a schematic structural view of one side of the female plug in the present invention;

[0021] Figure 4 In the present invention Figure 3 is an enlarged schematic structural view of part A;

[0022] Figure 5 is a schematic structural view of one side of the male plug in the present invention;

[0023] Figure 6 In the present invention Figure 5 is an enlarged schematic structural view of part B;

[0024] Figure 7 is a schematic partial structural view of the driving mechanism in the present invention;

[0025] Figure 8 is a schematic structural view of one side of the heat dissipation component in the present invention.

[0026] In the figure: 1, male plug; 2, female plug; 3, heat conduction gasket; 4, heat dissipation fins; 5, heat dissipation component; 51, first air hole; 52, first waterproof and breathable membrane; 53, connecting rod; 54, heat dissipation fan; 55, second air hole; 56, second waterproof and breathable membrane; 6, connection groove; 61, embedding hole; 7, connection block; 71, embedding block; 8, driving mechanism; 81, transmission rack; 82, transmission gear; 83, shaft rod; 84, first spring; 85, pull rod; 86, pull block; 87, limiting component; 871, guiding frame; 872, guiding block; 873, sliding rod; 9, transmission mechanism; 91, installation groove; 92, second spring; 93, transmission block; 94, conductive column; 95, conductive block; 96, limiting groove; 10, LED lamp; 11, fixing block; 12, third spring; 13, push block; 14, limiting rod; 15, docking groove; 16, docking block. Detailed implementation manners

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1-8 , in the embodiment of the present invention, a high-temperature resistant connector of a communication transmission device includes a male plug 1 and a female plug 2. Heat-conducting gaskets 3 are fixedly connected inside both the male plug 1 and the female plug 2. Heat-radiating fins 4 are fixedly connected to the outer surfaces of both the male plug 1 and the female plug 2. Heat-dissipating components 5 are provided on both the male plug 1 and the female plug 2. Connection grooves 6 are opened on both sides inside the female plug 2. Embedding holes 61 are opened on one side of the connection groove 6. Connection blocks 7 are inserted into the connection grooves 6. An embedding block 71 is fixedly connected to one side of the connection block 7. The embedding block 71 is movably connected to the embedding hole 61. A driving mechanism 8 is provided on one side of the male plug 1. The embedding block 71 is fixedly connected to the embedding hole 61 through the driving mechanism 8. A transmission mechanism 9 is provided on one side of the female plug 2. One side of the embedding block 71 is movably connected to one side of the transmission mechanism 9. An LED lamp 10 is fixedly connected to the top of the female plug 2. The LED lamp 10 is connected to the circuit where the conductive column 94 and the conductive block 95 are located. When the conductive column 94 contacts the conductive block 95 and the circuit is turned on, current flows through the LED indicator, exciting the semiconductor material inside it to emit light. The lighting of the LED indicator serves as an intuitive signal of successful connection, prompting the staff that the circuit has been turned on; it solves the problems of poor heat dissipation effect relying only on materials and insufficient connection reliability between the male plug 1 and the female plug 2. It can not only significantly improve the stability and service life of the communication transmission device during high-load operation, ensure the stable transmission of communication signals, improve the reliability and energy efficiency of the entire communication system, but also effectively reduce the costs caused by equipment failures and maintenance.

[0029] Please refer to Figure 1 、 Figure 3 、 Figure 8, the heat dissipation component 5 includes a first air hole 51 which is opened on one side of the male plug 1 and the female plug 2 where the heat dissipation fins 4 are located. A first waterproof and breathable membrane 52 is installed inside the first air hole 51. A connecting rod 53 is fixedly connected to the bottom end of the first waterproof and breathable membrane 52, and a heat dissipation fan 54 is fixedly connected to the bottom end of the connecting rod 53. Second air holes 55 are opened on one side of the male plug 1 and the female plug 2 away from the first air hole 51, and a second waterproof and breathable membrane 56 is installed inside the second air holes 55; the heat dissipation fan 54 inhales and discharges air through the first air holes 51 and the second air holes 55, accelerating the heat dissipation inside the connector, ensuring that the connector can effectively dissipate heat in a high-temperature environment, preventing electrical connection instability problems caused by overheating. At the same time, the first waterproof and breathable membrane 52 and the second waterproof and breathable membrane 56 can protect the connector from water vapor invasion and improve the service life of the connector. It should be added that circular frames are fixedly connected to the outer sides of the first waterproof and breathable membrane 52 and the second waterproof and breathable membrane 56.

[0030] Please refer to Figure 1 and Figure 7 , the driving mechanism 8 includes a transmission gear 82 which is rotatably connected to one side of the male plug 1 through a shaft rod 83. Transmission racks 81 are meshed and connected to both sides of the transmission gear 82. A limiting component 87 is arranged on one side inside the male plug 1, and the transmission racks 81 are slidably connected to the inside of the male plug 1 through the limiting component 87. One side of the transmission rack 81 is fixedly connected to one side of a connecting plate. A pull rod 85 is fixedly connected to one side of the transmission rack 81 away from the transmission gear 82. A first spring 84 is sleeved and fixedly connected to one side of the pull rod 85, and the side of the first spring 84 away from the transmission rack 81 is fixedly connected to the inner wall of the male plug 1. A pull block 86 is fixedly connected to the side of the pull rod 85 that slides out of the male plug 1; by driving the pull rod 85 to move through the pull block 86 and compressing the first spring 84 at the same time, the pull rod 85 drives the directly connected transmission rack 81 to move. The transmission rack 81 drives the other transmission rack 81 to move through the transmission gear 82, and finally drives the connecting block 7 and the embedding block 71 to move outwards to prepare for the insertion of the male plug 1. When the pull block 86 is released, the first spring 84 recovers its deformation, pushing the pull rod 85 and the transmission rack 81 to reset, and then driving the embedding block 71 of the connecting block 7 to insert into the embedding hole 61, realizing the fixed connection between the male plug 1 and the female plug 2.

[0031] Please refer to Figure 7, the limiting component 87 includes a guide frame 871, the guide frame 871 is fixedly connected inside the male plug 1, a slide bar 873 is fixedly connected to one side of the guide frame 871, a guide block 872 is slidably connected to the outer surface of the slide bar 873, and one side of the guide block 872 is fixedly connected to one side of the transmission rack 81; the guide block 872 connected to the transmission rack 81 slides on the slide bar 873 of the guide frame 871, providing a stable sliding track for the transmission rack 81, ensuring that the transmission rack 81 does not deviate from the predetermined path during movement, and restricting the movement position of the transmission rack 81, ensuring the stability and accuracy of the transmission rack 81 during movement.

[0032] Please refer to Figure 2 , a docking groove 15 is provided on the side of the female plug 2 away from the LED lamp 10, a docking block 16 is fixedly connected to the side of the male plug 1 away from the driving mechanism 8, and the docking block 16 is movably connected to the docking groove 15; during the insertion of the male plug 1 into the female plug 2, the docking block 16 and the docking groove 15 match and connect with each other, ensuring the smoothness of the connection position below the connector, improving the firmness and accuracy of the connector connection, and preventing signal transmission instability problems caused by uneven connection positions.

[0033] Please refer to Figure 4 , the transmission mechanism 9 includes an installation groove 91, the installation groove 91 is provided inside the female plug 2 and is communicated with the embedding hole 61, a second spring 92 is fixedly connected inside the installation groove 91, a transmission block 93 is fixedly connected to one side of the second spring 92, a conductive column 94 is fixedly connected to the side of the transmission block 93 close to the second spring 92, a conductive block 95 is fixedly connected to one side of the installation groove 91 close to the conductive column 94, one side of the conductive column 94 is movably connected to one side of the conductive block 95, limiting grooves 96 are provided on both sides inside the installation groove 91, and one side of the transmission block 93 is slidably connected to the limiting grooves 96; when the embedding block 71 is inserted into the embedding hole 61, it pushes the transmission block 93 to move, thereby driving the conductive column 94 to contact and connect with the conductive block 95 to turn on the circuit. At this time, the LED lamp 10 lights up, indicating successful connection. When the connector is loose, the conductive column 94 and the conductive block 95 are disconnected, and the LED lamp 10 goes out, which can greatly simplify the inspection work, enabling the staff to more quickly and accurately identify the loosening of the connector, thereby shortening the inspection time and improving work efficiency. It should be added that the elastic force of the first spring 84 is much greater than that of the second spring 92, ensuring that the embedding block 71 can smoothly enter the embedding hole 61 to push the transmission block 93.

[0034] Please refer to Figure 6, on one side of the male plug 1 close to the pulling block 86, a fixing block 11 is fixedly connected. Inside the fixing block 11, a third spring 12 is fixedly connected. The top end of the third spring 12 is fixedly connected to a pushing block 13. One end of the pushing block 13 away from the third spring 12 is fixedly connected to a limiting rod 14. One side of the limiting rod 14 is movably connected to the pulling block 86; when the pulling block 86 is not working, the limiting rod 14 is inserted into the pulling block 86 under the action of the third spring 12 to limit and fix the pulling block 86, so that the embedding block 71 is kept stable and there will be no loosening after connection, thus ensuring the stable connection between the female plug 2 and the male plug. When the pulling block 86 needs to be used, push the pushing block 13 to drive the limiting rod 14 to move away from the pulling block 86, and then the pulling block 86 can be used.

[0035] The working principle of the present invention is as follows: When connecting the female plug 2 and the male plug 1, the pulling block 86 drives the pull rod 85 to move, the pull rod 85 drives a transmission rack 81 to move, the transmission rack 81 drives a transmission gear 82 to rotate. As the transmission gear 82 rotates, it can drive another transmission rack 81 to move. The transmission rack 81 drives the connecting block 7 to move, the connecting block 7 drives the embedding block 71 to move outwards, and then the male plug 1 is inserted into the female plug 2. The docking block 16 is connected to the docking groove 15 to keep the connection position below the connector stable. After the connecting block 7 is inserted into the connecting groove 6, at this time, release the pulling block 86, the first spring 84 resumes deformation, and the embedding block 71 is inserted into the embedding hole 61 to fix the connection between the female plug 2 and the male plug 1, enhancing the connection stability between the male plug 1 and the female plug 2, making the two not easy to loosen and fall off, and ensuring the stable transmission of communication signals. After the female plug 2 and the male plug 1 are connected, when the embedding block 71 enters the embedding hole 61, it will push the transmission block 93 to move, the transmission block 93 pushes the conductive column 94 to move, and the conductive column 94 contacts the conductive block 95 to connect the circuit. At this time, the LED lamp 10 lights up as a signal of successful connection. Once the female plug 2 and the male plug 1 are loosened and separated, the conductive column 94 and the conductive block 95 are disconnected, and the LED lamp 10 goes out, so as to timely discover and handle the problem of connector loosening, which can effectively avoid system downtime caused by potential faults not being discovered in time, significantly reduce the risk caused by faults in the system, and ensure the stable operation of the communication system. When the connector is working, the heat generated inside it will be quickly discharged through the trough formed by the heat dissipation fins 4, and with the action of the first air hole 51, the second air hole 55, and the heat dissipation fan 54, the heat dissipation is accelerated. The first waterproof and breathable film 52 in the first air hole 51 and the second waterproof and breathable film 56 in the second air hole 55 facilitate heat dissipation and can prevent water vapor from entering, ensuring stable electrical connection in a high-temperature environment, thereby significantly improving the stability of the device during high-load operation.

Claims

1. A high temperature resistant connector for communication transmission equipment, characterized in that: The invention comprises a male plug (1) and a female plug (2), wherein the inside of the male plug (1) and the female plug (2) are fixedly connected with a heat-conducting pad (3), the outer surfaces of the male plug (1) and the female plug (2) are fixedly connected with a heat-dissipating fin (4), the male plug (1) and the female plug (2) are provided with a heat-dissipating assembly (5), the inside of the female plug (2) is provided with a connecting groove (6) on both sides, one side of the connecting groove (6) is provided with an embedding hole (61), and the inside of the connecting groove (6) is plugged with a connecting block (7 ), one side of the connection block (7) is fixedly connected to an embedding block (71), the embedding block (71) is movably connected to the embedding hole (61), one side of the male plug (1) is provided with a driving mechanism (8), the embedding block (71) is fixedly connected to the embedding hole (61) through the driving mechanism (8), one side of the female plug (2) is provided with a transmission mechanism (9), one side of the embedding block (71) is movably connected to one side of the transmission mechanism (9), and the top end of the female plug (2) is fixedly connected to an LED lamp (10).

2. A high temperature resistant connector for communication transmission equipment according to claim 1, characterized in that: The heat dissipation assembly (5) comprises a first air hole (51), the first air hole (51) being opened on the male plug (1) and the female plug (2) and being located on one side of the heat dissipation fin (4), a first waterproof breathable membrane (52) being installed inside the first air hole (51), a connecting rod (53) being fixedly connected to the bottom end of the first waterproof breathable membrane (52), and a heat dissipation fan (54) being fixedly connected to the bottom end of the connecting rod (53).

3. A high temperature resistant connector for communication transmission equipment according to claim 2, characterized in that: A second air hole (55) is provided on a side of the male plug (1) and the female plug (2) away from the first air hole (51), and a second waterproof and breathable membrane (56) is installed inside the second air hole (55).

4. A high temperature resistant connector for communication transmission equipment according to claim 1, characterized in that: The driving mechanism (8) comprises a transmission gear (82), the transmission gear (82) being rotatably connected to one side of the male plug (1) via a shaft (83), both sides of the transmission gear (82) being meshingly connected to transmission racks (81), a limiting assembly (87) being provided on one side of the interior of the male plug (1), the transmission rack (81) being slidably connected to the interior of the male plug (1) via the limiting assembly (87), and one side of the transmission rack (81) being fixedly connected to one side of a connecting plate.

5. A high temperature resistant connector for communication transmission equipment according to claim 4, characterized in that: A pull rod (85) is fixedly connected to the side of the transmission rack (81) away from the transmission gear (82), and a first spring (84) is sleeved and fixedly connected to one side of the pull rod (85). The side of the first spring (84) away from the transmission rack (81) is fixedly connected to the inner wall of the male plug (1), and the side of the pull rod (85) that slides out of the male plug (1) is fixedly connected to a pull block (86).

6. A high temperature resistant connector for communication transmission equipment according to claim 4, characterized in that: The limiting assembly (87) comprises a guide frame (871), wherein the guide frame (871) is fixedly connected to the interior of the male plug (1), a slide rod (873) is fixedly connected to one side of the guide frame (871), a guide block (872) is slidably connected to the outer surface of the slide rod (873), and one side of the guide block (872) is fixedly connected to one side of the transmission rack (81).

7. A high temperature resistant connector for communication transmission equipment according to claim 1, characterized in that: A docking groove (15) is provided on the side of the female plug (2) away from the LED lamp (10), and a docking block (16) is fixedly connected to the side of the male plug (1) away from the driving mechanism (8), wherein the docking block (16) is movably connected to the docking groove (15).

8. A high temperature resistant connector for communication transmission equipment according to claim 1, characterized in that: The transmission mechanism (9) comprises a mounting groove (91), the mounting groove (91) being arranged inside the female plug (2), and the mounting groove (91) being communicated with the embedding hole (61), a second spring (92) being fixedly connected inside the mounting groove (91), a transmission block (93) being fixedly connected to one side of the second spring (92), a conductive column (94) being fixedly connected to one side of the transmission block (93) close to the second spring (92), a conductive block (95) being fixedly connected to one side of the mounting groove (91) close to the conductive column (94), one side of the conductive column (94) being movably connected to one side of the conductive block (95), limiting grooves (96) being arranged on both sides inside the mounting groove (91), and one side of the transmission block (93) being slidably connected to the limiting groove (96).

9. A high temperature resistant connector for communication transmission equipment according to claim 5, characterized in that: A fixed block (11) is fixedly connected to one side of the male plug (1) close to the pull block (86); a third spring (12) is fixedly connected to the interior of the fixed block (11); a push block (13) is fixedly connected to the top of the third spring (12); an end of the push block (13) away from the third spring (12) is fixedly connected to a limiting rod (14); and one side of the limiting rod (14) is movably connected to the pull block (86).

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