Fuzzy temperature controller

Abstract

The application discloses a fuzzy temperature controller and belongs to the technical field of temperature control equipment, which comprises a shell, a display and a temperature control element, detachable heat dissipation mechanisms are arranged on four sides of the shell, telescopic rods are fixed on the corners of the four sides of the shell, a plurality of wiring terminals are symmetrically arranged at the rear end of the shell, uniform air cooling assemblies are connected to the movable ends of the telescopic rods away from the shell, locking assemblies are arranged at the upper and lower ends of the shell, and terminal wiring limiting mechanisms are arranged between the uniform air cooling assemblies and the shell. Through cooperation of the detachable heat dissipation mechanisms and the uniform air cooling assemblies, the four sides of the shell are uniformly and efficiently forced to flow and dissipate heat while the overall sealing protection of the shell is maintained; the long-term stability and safety of electrical connection are remarkably improved through the terminal wiring limiting mechanisms, and the wiring terminal area is isolated from the external environment.

Description

Technical Field

[0001] This invention belongs to the technical field of temperature control equipment, specifically relating to a fuzzy temperature controller. Background Technology

[0002] A fuzzy temperature controller is a control device that uses fuzzy logic algorithms for intelligent temperature regulation. It is widely used in industrial automation, cold chain logistics, HVAC, and laboratory equipment.

[0003] Its core control components (such as microprocessors and power modules) generate a large amount of heat during operation. If heat dissipation is not timely, it will lead to a decrease in control accuracy, accelerated component aging, or even burnout. Existing temperature controllers typically use passive heat dissipation holes on the side of the housing or built-in small fans for heat dissipation. However, in harsh environments such as high dust and high humidity, the heat dissipation holes are prone to contamination or moisture absorption of the internal circuitry, while the sealed structure severely restricts heat dissipation efficiency. In addition, the wiring terminals of traditional controllers are usually exposed or only protected by simple covers. After wiring, the wires are prone to loosening and pulling, leading to poor contact. Moreover, installation and maintenance require the removal of multiple screws, making the operation cumbersome.

[0004] Therefore, there is an urgent need for a fuzzy temperature controller that can ensure sealing, achieve efficient and uniform heat dissipation, and provide reliable protection for terminal wiring. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a fuzzy temperature controller.

[0006] The technical solution adopted to solve the above technical problems is: a fuzzy temperature controller, including a housing, a display, and a temperature control element. The housing is provided with detachable heat dissipation mechanisms on all four sides. Telescopic rods are fixedly connected to the four corners of the housing. Several wiring terminals are symmetrically arranged at the rear end of the housing. The movable end of the telescopic rod is connected to a uniform air cooling component away from the housing opening. The uniform air cooling component and the detachable heat dissipation mechanism cooperate to achieve sealed and efficient heat dissipation of the temperature control element. Locking components for locking and limiting the uniform air cooling component are provided at both the upper and lower ends of the housing. A terminal wiring limiting mechanism for protecting and limiting the wiring terminals and the lines connected to the wiring terminals is provided between the uniform air cooling component and the housing.

[0007] Furthermore, the display is fixedly connected to the open end of the housing, a sealing gasket is provided between the connection between the housing and the display, and the temperature control element is located inside the housing.

[0008] By using the above technical solution and setting a sealing gasket, external dust or moisture can be prevented from entering the interior of the housing through the front seam.

[0009] Furthermore, the detachable heat dissipation mechanism includes heat dissipation notches symmetrically opened on the four sides of the housing opening and slots fixed to the inner walls of the four sides of the housing. Each side of the heat dissipation notch is provided with several notches along the depth direction of the housing. A heat dissipation plate is inserted into each slot. Several fins are arranged on each heat dissipation plate. Several ventilation holes are opened through the sidewalls of each fin. The number and position of the fins of a single heat dissipation plate correspond to the number and position of a single set of heat dissipation notches. The front end of each heat dissipation plate is flush with the opening end face of the housing.

[0010] The above technical solution utilizes fins to quickly conduct heat generated by the internal temperature control components to the outside of the housing, and forms an airflow channel through ventilation holes. When external air-cooled air passes through, it can penetrate the fins and carry away the heat, significantly improving heat exchange efficiency. At the same time, the heat sink can be pulled out from the slot, which is convenient for regular cleaning of accumulated dust or replacement of heat sinks of different materials according to different working conditions, improving maintenance convenience and adaptability to working conditions.

[0011] Furthermore, the uniform air-cooling assembly includes a storage shell fixedly connected to the movable end of the telescopic rod. The storage shell has duckbill air outlets on the four sides of the shell facing the shell. The duckbill air outlets correspond to the positions of the fins. A cooling fan is installed through the side wall of the storage shell away from the shell. A conical air guide plate is fixedly connected to the front inner wall of the storage shell. The tip of the cooling fan faces the center of the cooling fan's blowing end. The duckbill air outlets on the four sides are arranged around the four sides of the conical air guide plate.

[0012] Through the above technical solution, the cooling airflow introduced by the heat dissipation fan impacts the conical air guide plate and is evenly distributed to the duckbill air outlets on all four sides. The duckbill structure makes the airflow flat and high-speed, directly washing the fin surface and ventilation holes. Since the airflow path covers all four sides of the shell, the problem of uneven heat dissipation of traditional single fans is avoided.

[0013] Furthermore, the locking assembly includes a fixing frame vertically fixed to the outer wall of the telescopic rod and a second magnetic block fixed above and below the rear wall of the cooling fan. The fixing frame has a fixing rod fixed to one end facing away from the housing, and a rotating baffle is rotatably connected to the other end of the fixing rod. A first magnetic block is fixed to the side wall of the rotating baffle facing the housing, and the first magnetic block and the adjacent second magnetic block are magnetically attracted to each other.

[0014] The above technical solution can lock the telescopic rod in the retracted state, thereby maintaining close contact between the uniform air-cooling component and the housing; when it needs to be unfolded, simply manually open the rotating baffle, which can be unlocked without tools, making the operation convenient.

[0015] Furthermore, the terminal wiring limiting mechanism includes clamping arc plates symmetrically arranged and fixed on the left and right side walls of the housing, and sealing plates symmetrically fixed on the front wall of the housing. Clamping arc plates 2 are arranged and fixed on the side walls of the sealing plates. The positions of the clamping arc plates 2 and 3 correspond to those of the clamping arc plates 1. Adjacent clamping arc plates 1 and 2 are combined to form a cylindrical groove. Insulating blocks are fixed to the side of the sealing plates facing the wiring terminals. The positions of the insulating blocks correspond to those of the screw heads connecting the wiring terminals.

[0016] With the above technical solution, after the wiring is completed, when the housing moves closer to the housing, the sealing plate moves accordingly, so that the second clamping arc plate and the first clamping arc plate fixed on the housing fit together, effectively limiting the bending and pulling of the cable; at the same time, the insulating pressure block moves with the sealing plate and directly abuts against the screw head of the terminal, which can prevent the screw from loosening due to vibration.

[0017] Furthermore, when the insulating pressure block abuts against the connecting screw head of the terminal block, the front wall of the sealing plate is sealed and fitted with the rear wall of the housing, and the clamping arc plate one and the clamping arc plate two are joined together.

[0018] Through the above technical solution, the sealing plate and the rear wall of the housing form a surface seal. Combined with the wrapping of the wires by the clamping arc plate one and clamping arc plate two, the terminal area is isolated from the external environment, thus achieving dustproof and moisture-proof protection for the terminal.

[0019] Furthermore, rubber pads are adhered to the inner arc surfaces of both the clamping arc plate one and the clamping arc plate two.

[0020] Through the above technical solution, the rubber pad can increase the friction between itself and the outer sheath of the wire, while avoiding excessive clamping force that could damage the wire insulation layer. At the same time, it can seal and adhere to the insulation layer, further improving the sealing effect of the wiring area of ​​the terminal block.

[0021] The beneficial effects of this invention are as follows: (1) By combining the detachable heat dissipation mechanism with the uniform air cooling component, the internal heat is discharged by the fins passing through the heat dissipation gap, and the airflow of the heat dissipation fan is evenly distributed to the four duckbill air outlets by the conical air guide plate, forming a flat high-speed airflow to scour the fins and ventilation holes. While the shell maintains overall sealing protection, it achieves uniform and efficient forced convection heat dissipation on all four sides, isolating the influence of harsh environmental factors such as external dust and moisture, and significantly improving the reliability and service life of the controller under complex working conditions. (2) By setting the terminal wiring limit mechanism, when the uniform air cooling component returns to its original position, the wire limit cylinder groove is formed by the splicing of the clamping arc plate one and the clamping arc plate two, which effectively prevents poor contact caused by cable pulling or vibration; at the same time, the insulating pressure block directly abuts against the screw head of the terminal, which plays a physical anti-loosening role, significantly improving the long-term stability and safety of the electrical connection, and isolating the terminal area from the external environment, thus realizing the dustproof and moistureproof protection of the terminal. (3) The locking components and telescopic rods enable the uniform air cooling components to switch quickly between the working position and the maintenance position. No tools are required for the switching process. The magnetic locking is reliable and convenient, which greatly improves the ease of operation during wiring and maintenance. Attached Figure Description

[0022] Figure 1 This is a three-dimensional representation of the fuzzy temperature controller of the present invention. Figure 1 ; Figure 2 This is the structure of the fuzzy temperature controller of the present invention. Figure 1 ; Figure 3 This is a three-dimensional representation of the fuzzy temperature controller of the present invention. Figure 2 ; Figure 4 This is the structure of the fuzzy temperature controller of the present invention. Figure 2 ; Figure 5 This is a structural diagram of the detachable heat dissipation mechanism of the fuzzy temperature controller of the present invention; Figure 6 yes Figure 5 Enlarged view of point A.

[0023] Reference numerals: 1. Housing; 2. Display; 3. Temperature control element; 4. Detachable heat dissipation mechanism; 5. Telescopic rod; 6. Terminal block; 7. Uniform air cooling assembly; 8. Locking assembly; 9. Terminal wiring limit mechanism; 401. Heat dissipation notch; 402. Slot; 403. Heat dissipation plate; 404. Fin; 4041. Ventilation hole; 701. Storage shell; 7011. Duckbill air outlet; 702. Conical air guide plate; 703. Cooling fan; 801. Fixing frame; 802. Fixing rod; 803. Rotating baffle; 804. Magnetic block one; 805. Magnetic block two; 901. Clamping arc plate one; 902. Sealing plate; 903. Clamping arc plate two; 904. Insulating pressure block. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] like Figures 1-6 As shown, the fuzzy temperature controller of this embodiment includes a housing 1, a display 2, and a temperature control element 3. The housing 1 is provided with a detachable heat dissipation mechanism 4 on all four sides. Telescopic rods 5 are fixedly connected to the four corners of the housing 1. A number of wiring terminals 6 are symmetrically arranged at the rear end of the housing 1. The movable end of the telescopic rod 5 is connected to a uniform air cooling component 7 away from the opening of the housing 1. The uniform air cooling component 7 and the detachable heat dissipation mechanism 4 cooperate to achieve sealed and efficient heat dissipation of the temperature control element 3. The upper and lower ends of the housing 1 are provided with locking components 8 for locking and limiting the uniform air cooling component 7. A terminal wiring limiting mechanism 9 is provided between the uniform air cooling component 7 and the housing 1 to protect and limit the wiring terminals 6 and the lines connected to the wiring terminals 6. The display 2 is fixedly connected to the open end of the housing 1, and a sealing gasket is provided between the connection between the housing 1 and the display 2. The temperature control element 3 is located inside the housing 1. A sealing gasket is provided between the display 2 and the housing 1 to prevent external dust or moisture from entering the housing 1 from the front seam, thereby forming a basic sealing protection for the temperature control element 3.

[0026] like Figure 5 , Figure 6 As shown, the detachable heat dissipation mechanism 4 includes heat dissipation notches 401 symmetrically opened on the four sides of the opening of the housing 1 and slots 402 fixed on the inner walls of the four sides of the housing 1. Each heat dissipation notch 401 is provided with several along the depth direction of the housing 1. A heat dissipation plate 403 is inserted into each slot 402. Several fins 404 are arranged on each heat dissipation plate 403. Several ventilation holes 4041 are opened through the side walls of each fin. The number and position of the fins 404 of a single heat dissipation plate 403 correspond to the number and position of a single set of heat dissipation notches 401. The front end of each heat dissipation plate 403 is flush with the opening end face of the housing 1. The heat sink 403 is detachably mounted on the inner walls of the four sides of the housing 1 via slots 402. Its fins 404 are partially exposed through the heat dissipation gaps 401. This structure utilizes the fins 404 to quickly conduct the heat generated by the internal temperature control element 3 to the outside of the housing 1, and also forms an airflow channel through the ventilation holes 4041. When the external air-cooled airflow passes through, it can penetrate the fins 404 and carry away the heat, significantly improving the heat exchange efficiency. At the same time, the heat sink 403 can be pulled out from the slots 402, which is convenient for regular cleaning of accumulated dust or replacement of heat sink 403 with heat sinks of different materials according to different working conditions, improving maintenance convenience and adaptability to working conditions. During assembly, the heat sink 403 seals the heat dissipation gaps 401, ensuring heat dissipation efficiency while preventing dust and moisture from entering the housing 1 and damaging the internal temperature control element 3.

[0027] like Figure 2 , Figure 4As shown, the uniform air-cooling assembly 7 includes a storage shell 701 fixedly connected to the movable end of the telescopic rod 5. The storage shell 701 has duckbill air outlets 7011 on the four sides of the housing 1 facing the housing 1. The duckbill air outlets 7011 correspond to the positions of the fins 404. A cooling fan 703 is installed through the side wall of the storage shell 701 away from the housing 1. A conical air guide plate 702 is fixedly connected to the front inner wall of the storage shell 701. The tip of the cooling fan 703 faces the center of the air blowing end of the cooling fan 703. The four duckbill air outlets 7011 are arranged around the four sides of the conical air guide plate 702. The cooling airflow introduced by the cooling fan 703 impacts the conical air guide plate 702 and is evenly distributed to the duckbill air outlets 7011 on all four sides. The duckbill structure makes the airflow flat and high-speed, directly washing the surface of the fins 404 and the ventilation holes 4041. Since the airflow path covers all four sides of the housing 1, the problem of uneven heat dissipation of traditional single fans is avoided. At the same time, the telescopic rod 5 can drive the storage housing 701 to move back and forth. When it is necessary to maintain the wiring terminal 6, the storage housing 701 can be pulled back to expose the operating space.

[0028] like Figure 3 As shown, the locking assembly 8 includes a fixing frame 801 vertically fixed to the outer wall of the telescopic rod 5 and a magnetic block 805 fixed to the upper and lower sides of the rear wall of the cooling fan 703. The fixing frame 801 is fixedly connected to a fixing rod 802 at one end facing away from the housing 1. The other end of the fixing rod 802 is rotatably connected to a rotating baffle 803. The rotating baffle 803 is fixedly connected to a magnetic block 804 on the side wall facing the housing 1. The magnetic block 804 and the adjacent magnetic block 805 are magnetically attracted to each other. When the housing 701 retracts with the telescopic rod 5 to fit against the rear wall of the housing 1, the rotating baffle 803 is rotated so that the magnetic block 804 first attracts the magnetic block 805 second on the housing 701, thus locking the telescopic rod 5 in the retracted state, thereby maintaining close contact between the uniform air cooling component 7 and the housing 1. When it needs to be unfolded, the rotating baffle 803 can be manually opened without tools, which is convenient to operate. This not only prevents the telescopic rod 5 from accidentally extending due to equipment vibration and causing the uniform air cooling component 7 to fall out of the effective working position, but also makes it easy to quickly pull out the uniform air cooling component 7 to expose the wiring terminal 6 area during later maintenance.

[0029] like Figures 1-4 As shown, the terminal wiring limiting mechanism 9 includes clamping arc plates 901 symmetrically arranged and fixed on the left and right side walls of the housing 1, and sealing plates 902 symmetrically fixed on the front wall of the housing 701. Clamping arc plates 903 are arranged and fixed on the side walls of the sealing plates 902. The positions of the clamping arc plates 903 and the clamping arc plates 903 correspond to the positions of the clamping arc plates 901 and the adjacent clamping arc plates 901 and the clamping arc plates 903 are combined into a cylindrical groove. Insulating blocks 904 are fixedly connected to the side of the sealing plates 902 facing the terminal 6. The positions of the insulating blocks 904 correspond to the positions of the connecting screw heads of the terminal 6. After the wiring is completed, when the housing 701 moves closer to the housing 1, the sealing plate 902 moves accordingly, so that the clamping arc plate 2 903 and the clamping arc plate 1 901 fixed on the housing 1 are joined together to form a cylindrical channel that completely wraps around each lead wire, effectively limiting the bending and pulling of the cable and preventing fatigue breakage of the wire at the terminal 6; at the same time, the insulating pressure block 904 moves with the sealing plate 902 and directly abuts against the screw head of the terminal 6, which can prevent the screw from loosening due to vibration and ensure the long-term reliability of the electrical connection. When the insulating pressure block 904 abuts against the connecting screw head of the terminal 6, the front wall of the sealing plate 902 is sealed and fitted against the rear wall of the housing 1, and the clamping arc plate one 901 and the clamping arc plate two 903 are joined together. When the uniform air-cooling component 7 is in the working position, the sealing plate 902 forms a surface seal with the rear wall of the housing 1. Together with the clamping arc plate one 901 and clamping arc plate two 903 wrapping the wires, the wiring terminal 6 area is isolated from the external environment, realizing dustproof and moisture-proof protection of the wiring terminal 6, and further improving the reliability of the controller in harsh environments. Rubber pads are bonded to the inner arc surfaces of clamping arc plate 901 and clamping arc plate 903. The rubber pads can increase the friction between the rubber pads and the outer sheath of the wire, while avoiding damage to the wire insulation layer due to excessive clamping force. They can also adapt to wires of different diameters, improving versatility. At the same time, they are sealed and adhered to the insulation layer, further improving the sealing effect of the wiring area of ​​terminal 6.

[0030] The working principle of this embodiment is as follows: when the fuzzy temperature controller is started, the temperature control element 3 generates heat. Under normal working conditions, the telescopic rod 5 is in a retracted state. At this time, the uniform air cooling component 7 is kept in close contact with the housing 1 through the locking component 8. First, the cooling fan 703 starts, drawing external cooling air into the housing 701. The airflow then impacts the conical air guide plate 702, which evenly directs the airflow to the four sides of the housing 701. The airflow is then ejected in a flat, high-speed form through the duckbill-shaped air outlet 7011, which faces the fins 404 on the four sides of the housing 1. The airflow directly washes over the surface of the fins 404 and the ventilation holes 4041, quickly carrying away the heat transferred from the temperature control element 3 to the fins 404. Since the heat sink 403 is fixed to the inner wall of the housing 1 via the slot 402 and the fins 404 are exposed through the heat dissipation notch 401, efficient heat dissipation is achieved while ensuring a relatively sealed interior for the housing 1. Secondly, in the wired state, the external wires are electrically connected to the temperature control element 3 through the terminal block 6. When the housing 701 retracts into place with the telescopic rod 5, the front wall of the sealing plate 902 seals against the rear wall of the housing 1. At the same time, the clamping arc plate 2 903 and the clamping arc plate 1 901 are combined to form a cylindrical channel that wraps around each wire, restricting the bending and pulling of the wires. The insulating pressure block 904 also presses against the connecting screw head of the terminal block 6 to prevent vibration from causing loosening. When the controller needs maintenance or rewiring, the operator manually moves the rotating baffle 803 to separate the magnetic block 1 804 from the magnetic block 2 805, releases the limit of the locking component 8, and then pulls the storage shell 701 outward, the telescopic rod 5 extends, and the uniform air cooling component 7 moves away from the rear end of the shell 1, exposing the wiring terminal 6, which is convenient for wiring. After maintenance, push the housing 701 back, the telescopic rod 5 retracts, the sealing plate 902 re-fits the rear wall of the housing 1, the clamping arc plate one 901 and the clamping arc plate two 903 automatically assemble, the insulating pressure block 904 re-presses against the screw head of the terminal 6, and finally rotate the rotating baffle 803 to make the magnetic block one 804 and the magnetic block two 805 attract each other, locking the working position, and the controller can resume normal operation.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A fuzzy temperature controller, comprising a housing (1), a display (2), and a temperature control element (3), characterized in that: The housing (1) is provided with a detachable heat dissipation mechanism (4) on all four sides. The four corners of the housing (1) are fixed with telescopic rods (5). The rear end of the housing (1) is symmetrically provided with several wiring terminals (6). The movable end of the telescopic rod (5) is connected to a uniform air cooling component (7) away from the opening of the housing (1). The uniform air cooling component (7) and the detachable heat dissipation mechanism (4) work together to achieve sealed and efficient heat dissipation of the temperature control element (3). The upper and lower ends of the housing (1) are provided with locking components (8) for locking and limiting the uniform air cooling component (7). The uniform air cooling component (7) and the housing (1) are provided with a terminal wiring limiting mechanism (9) for protecting and limiting the wiring terminals (6) and the lines connected to the wiring terminals (6).

2. The fuzzy temperature controller according to claim 1, characterized in that, The display (2) is fixedly connected to the open end of the housing (1), and a sealing gasket is provided between the connection between the housing (1) and the display (2). The temperature control element (3) is located inside the housing (1).

3. The fuzzy temperature controller according to claim 1, characterized in that, The detachable heat dissipation mechanism (4) includes heat dissipation notches (401) symmetrically opened on the four sides of the opening of the housing (1) and slots (402) fixed on the inner walls of the four sides of the housing (1). Each side of the heat dissipation notch (401) is provided with several along the depth direction of the housing (1). A heat dissipation plate (403) is inserted into each slot (402). Several fins (404) are arranged on each heat dissipation plate (403). Several ventilation holes (4041) are opened through the side walls of each fin (404). The number and position of the fins (404) of a single heat dissipation plate (403) correspond to the number and position of a single heat dissipation notch (401). The front end of each heat dissipation plate (403) is flush with the opening end face of the housing (1).

4. The fuzzy temperature controller according to claim 1, characterized in that, The uniform air-cooling assembly (7) includes a storage shell (701) fixedly connected to the movable end of the telescopic rod (5). The storage shell (701) has duckbill air outlets (7011) on the side facing the shell (1) and around the four sides of the shell (1). The duckbill air outlets (7011) correspond to the positions of the fins (404). A cooling fan (703) is installed through the side wall of the storage shell (701) away from the shell (1). A conical air guide plate (702) is fixedly connected to the inner front wall of the storage shell (701). The tip of the cooling fan (703) faces the center of the air blowing end of the cooling fan (703). The duckbill air outlets (7011) on the four sides are arranged around the four sides of the conical air guide plate (702).

5. The fuzzy temperature controller according to claim 4, characterized in that, The locking assembly (8) includes a fixing frame (801) vertically fixed to the outer wall of the telescopic rod (5) and a magnetic block two (805) fixed above and below the rear wall of the cooling fan (703). The fixing frame (801) is fixedly connected to a fixing rod (802) at one end facing away from the housing (1). The other end of the fixing rod (802) is rotatably connected to a rotating baffle (803). The rotating baffle (803) is fixedly connected to a magnetic block one (804) on the side wall facing the housing (1). The magnetic block one (804) is magnetically attracted to the adjacent magnetic block two (805).

6. The fuzzy temperature controller according to claim 4, characterized in that, The terminal wiring limiting mechanism (9) includes clamping arc plates (901) symmetrically arranged and fixed on the left and right side walls of the housing (1) and sealing plates (902) symmetrically fixed on the front wall of the storage housing (701). Clamping arc plates (903) are arranged and fixed on the side walls of the sealing plates (902). The clamping arc plates (903) are all corresponding to the positions of clamping arc plates (901). The adjacent clamping arc plates (901) and clamping arc plates (903) are combined into a cylindrical groove. Insulating blocks (904) are fixed on the side of the sealing plates (902) facing the wiring terminal (6). The insulating blocks (904) are all corresponding to the positions of the connecting screw heads of the wiring terminal (6).

7. The fuzzy temperature controller according to claim 6, characterized in that, When the insulating pressure block (904) abuts against the connecting screw head of the terminal (6), the front wall of the sealing plate (902) is sealed and fitted with the rear wall of the housing (1), and the clamping arc plate one (901) and the clamping arc plate two (903) are joined together.

8. The fuzzy temperature controller according to claim 7, characterized in that: Rubber pads are adhered to the inner arc surfaces of the clamping arc plate one (901) and the clamping arc plate two (903).

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