Adjustable composite insulator umbrella skirt press-fit mechanism

Abstract

The application discloses a kind of adjustable composite insulator umbrella skirt press-fit mechanism, it is related to composite insulator umbrella skirt processing field, it includes operation platform, the inside of the operation platform is provided with lower press-fit mould, and the upper press-fit mould is arranged above lower press-fit mould, the bottom end of the upper press-fit mould is in contact with the bottom end of lower press-fit mould, the top of the upper press-fit mould is provided with connecting cover, and the symmetrical fitting balloon of one side inner wall of connecting cover is installed, and the electromagnetic block is installed in the outer wall of the side away from the inner wall of connecting cover of fitting balloon.The application can quickly realize flexible clamping to one end of core in composite insulator umbrella skirt press-fit, and can quickly complete clamping according to the size of core, so that in the operation process of composite insulator umbrella skirt press-fit mechanism, the limitations generated by traditional equipment can be effectively avoided, and the stability and practicability in composite insulator umbrella skirt press-fit are further improved.

Description

Technical Field

[0001] This application relates to the field of composite insulator skirt processing, and in particular to an adjustable composite insulator skirt pressing mechanism. Background Technology

[0002] Composite insulator skirts are core external insulation components in high-voltage and ultra-high-voltage power transmission and transformation systems. Belonging to the field of power equipment external insulation technology, they are mainly used in overhead transmission lines, substations, and converter stations, undertaking critical functions such as electrical insulation, pollution flashover protection, rain flashover protection, and mechanical protection. Their performance directly determines the weather resistance, operational reliability, and service life of composite insulators, thus affecting the safe and stable operation of the entire power transmission and transformation system. With the development of power systems towards ultra-high voltage, large capacity, and long-distance transmission, and the expansion of application scenarios in extreme climates (high altitude, high temperature, heavy pollution, strong ultraviolet radiation) and complex terrains (mountainous areas, coastal areas, and chemical-intensive areas), the demand for composite insulators is increasing.

[0003] In the existing technology, the operation process of the composite insulator skirt pressing mechanism needs to be combined with its core function of accurately and firmly assembling the skirt onto the core rod. However, since the composite insulator skirts and cores to be pressed are of different sizes, the traditional pressing mechanism can only perform pressing operations on a single core and a single composite insulator skirt. Furthermore, for some sizes of cores and composite insulator skirts, cumbersome disassembly and assembly steps are required for replacement, which leads to adjustment difficulties and limitations. Utility Model Content

[0004] To address the limitations of traditional pressing mechanisms, which cannot quickly press-fit cores of different sizes and composite insulator skirts, this application provides an adjustable composite insulator skirt pressing mechanism.

[0005] The adjustable composite insulator skirt pressing mechanism provided in this application adopts the following technical solution: An adjustable composite insulator skirt pressing mechanism includes an operating table. A lower pressing mold is disposed inside the operating table, and an upper pressing mold is disposed above the lower pressing mold. The bottom end of the upper pressing mold abuts against the bottom end of the lower pressing mold. A connecting cover is disposed at the top of the upper pressing mold, and fitting balloons are symmetrically installed on one inner wall of the connecting cover. An electromagnetic block is installed on the outer wall of the fitting balloons away from the inner wall of the connecting cover. The magnetic end of the electromagnetic block abuts against and magnetically attracts the outer wall of the upper pressing mold. The upper pressing mold is made of magnetic material. A lower pressing component is disposed at the top of the connecting cover, and the bottom end of the lower pressing component abuts against the top of the connecting cover. A movable sleeve is movably connected to the vertical outer wall of the operating table, and a flexible clamping structure is installed on one outer wall of the movable sleeve.

[0006] By adopting the above technical solution, during the operation, one end of the core is clamped and limited by a flexible clamping structure. The lower and upper pressing molds cooperate to cover the outside of the core, and the composite insulator skirt pressing operation is completed by injection molding. Both the lower and upper pressing molds can be quickly assembled and disassembled, and the flexible clamping structure can limit the core of different sizes, thereby achieving rapid adjustment and avoiding the problem of limitation.

[0007] Preferably, a guide frame is installed at the bottom of the inner side of the operating table, and a sliding sleeve that can slide left and right is installed on the top horizontal outer wall of the guide frame.

[0008] By adopting the above technical solution, the position of the lower pressing mold is adjusted by sliding the sliding sleeve on the horizontal outer wall of the guide frame.

[0009] Preferably, a transmission screw sleeve is installed at the bottom end of the sliding sleeve, a connecting screw is installed inside the guide frame, and the connecting screw is engaged with the inside of the transmission screw sleeve, and the connecting screw is rotatably connected to the bottom end of the guide frame.

[0010] By adopting the above technical solution, a screw drive structure is formed by connecting the screw and the transmission screw sleeve, and then the sliding sleeve is driven to slide left and right through the screw drive structure.

[0011] Preferably, a motor is installed on one outer wall of the guide frame, and the output end of the motor passes through the corresponding side wall of the guide frame. The motor is connected to the corresponding end of the connecting screw.

[0012] By adopting the above technical solution, the motor is controlled to rotate forward or reverse, thereby driving the connecting screw to rotate forward or reverse, thus making the connecting screw and the transmission screw sleeve form a screw transmission structure, driving the sliding sleeve to slide left and right.

[0013] Preferably, the top end of the sliding sleeve is symmetrically provided with insertion cavities, and the top end of the insertion cavity is provided with insertion blocks, which are symmetrically installed on the outer walls of both sides of the lower pressing mold.

[0014] By adopting the above technical solution, the insertion cavity and the insertion block are connected together, and the lower press mold can be installed quickly, so that lower press molds of different sizes can be installed quickly.

[0015] Preferably, the lower pressing mold has symmetrical connecting cavities installed on both outer walls, and the upper pressing mold has symmetrical guide blocks installed on both outer walls, with the bottom ends of the guide blocks inserted into the top of the connecting cavities.

[0016] By adopting the above technical solution, during the pressing process of the upper pressing mold downwards and pressing with the lower pressing mold, the guide block moves inside the connecting cavity, making the pressing process of the lower pressing mold more stable.

[0017] Preferably, the other end of the pressing component is connected to the top of the movable sleeve, a connecting block is installed on one outer wall of the movable sleeve, a cylinder is installed on the vertical outer wall of the operating table, and the bottom end of the connecting block is connected to the output end of the cylinder.

[0018] By adopting the above technical solution, the cylinder output operation can drive the connecting block and the movable sleeve to move vertically, thereby facilitating the separation of the lower part of the composite insulator skirt from the lower pressing mold.

[0019] Preferably, the flexible clamping structure includes at least an installation cavity, a wrapping balloon, and elastic sheets. One outer wall of the installation cavity is connected to the outer wall of the movable sleeve. The wrapping balloon is installed inside the installation cavity. Elastic sheets are evenly spaced inside the wrapping balloon. A silicone anti-slip pad is adhered to the outer wall of the wrapping balloon near the center point inside the installation cavity. An inflation device is installed at the top of the installation cavity, and transmission tubes are installed at both output ends of the inflation device. The other end of the transmission tube is connected to the wrapping balloon.

[0020] By adopting the above technical solution, one end of the core is inserted into the inside of the encapsulated balloon, and then the elastic sheet is squeezed. Due to the potential energy released by the elastic sheet, one end of the core is fixed. The inflation device injects gas into the encapsulated balloon through the transmission tube, so that the encapsulated balloon wraps around one end of the core, achieving flexible clamping of one end of the core.

[0021] Preferably, the pressing assembly includes at least a pressing plate and a transmission plate. The bottom end of the pressing plate abuts against the top end of the connecting cover. A transmission plate is provided at one end of the pressing plate. A rotating shaft is hinged to one end of the transmission plate near the pressing plate. The other end of the pressing plate is connected to the rotating shaft. A limit rod is inserted through the rotating shaft.

[0022] By adopting the above technical solution, when the upper pressing mold is disassembled and adjusted, the lower pressing plate can move in an arc around the rotating shaft, and when the lower pressing plate is pressing down, the limiting rod is inserted into the inside of the rotating shaft to limit the rotating shaft, so that the lower pressing plate can perform the pressing operation.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. In the pressing of composite insulator skirts, this utility model can quickly achieve flexible clamping of one end of the core and can quickly complete the clamping according to the size of the core. In this way, the limitations of traditional equipment can be effectively avoided during the operation of the composite insulator skirt pressing mechanism, and the stability and practicality in the pressing of composite insulator skirts can be further improved. 2. In the pressing of composite insulator skirts, this utility model allows for the selection of lower and upper pressing molds of the composite insulator skirt with matching sizes according to pressing requirements. The lower and upper pressing molds can be quickly assembled and disassembled, and can be adjusted. This method can effectively improve the practicality of the device in operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the combined structure of the connecting cover, the fitting balloon, and the electromagnetic block in this utility model; Figure 3 This is a cross-sectional structural diagram of the transmission tube in this utility model; Figure 4 This is a schematic diagram of the combined components of the mounting cavity, the encapsulating balloon, the elastic sheet, the silicone anti-slip pad, and the inflation device in this utility model. Figure 5 This is a schematic diagram of the combined parts structure of the lower pressure component in this utility model.

[0025] Reference numerals: 1. Operating table; 2. Sliding sleeve; 3. Transmission screw sleeve; 4. Connecting screw; 5. Motor; 6. Insertion cavity; 7. Insertion block; 8. Lower pressing mold; 9. Upper pressing mold; 10. Guide block; 11. Connecting cavity; 12. Connecting cover; 13. Fitting balloon; 14. Electromagnetic block; 15. Pressing assembly; 1501. Pressing plate; 1502. Rotating shaft; 1503. Transmission plate; 1504. Limiting rod; 16. Movable sleeve; 17. Connecting block; 18. Cylinder; 19. Mounting cavity; 20. Encasing balloon; 21. Elastic sheet; 22. Silicone anti-slip mat; 23. Inflation device; 24. Transmission pipe; 25. Guide frame. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0027] This application discloses an adjustable composite insulator skirt pressing mechanism.

[0028] Reference Figure 1An adjustable composite insulator skirt pressing mechanism includes an operating table 1. A guide frame 25 with a concave structure is fixedly connected to the bottom of the operating table 1. A connecting screw 4 is rotatably connected between the inner walls of both sides of the guide frame 25. A transmission screw sleeve 3 is installed on the outside of the connecting screw 4. The inner side wall of the transmission screw sleeve 3 meshes with the outer side wall of the connecting screw 4. The connecting screw 4 and the transmission screw sleeve 3 form a screw transmission structure. A motor 5 is fixedly connected to one outer wall of the guide frame 25. The output end of the motor 5 is fixedly connected to one end of the connecting screw 4. A sliding sleeve 2 is fixedly connected to the top of the transmission screw sleeve 3. The sliding sleeve 2 is slidably connected to the horizontal outer wall of the guide frame 25. A plug-in cavity 6 is symmetrically fixedly connected to the top of the sliding sleeve 2. The top of the plug-in cavity 6 has a semi-circular structure. A lower pressing mold 8 is provided above the sliding sleeve 2. Circular plug-in blocks 7 are fixedly connected to both sides of the lower pressing mold 8. The bottom end of the plug-in block 7 is inserted into the top of the plug-in cavity 6.

[0029] During the press-fitting of composite insulator skirts, a suitable lower press-fitting mold 8 is selected according to the required size of the composite insulator. The lower press-fitting mold 8 is inserted into the top of the insertion cavity 6 through the plug-in blocks 7 fixed on both outer walls, so that the lower press-fitting mold 8 is connected to the sliding sleeve 2. According to the area to be pressed into the core, the motor 5 is driven to rotate forward or reverse through the output end, which drives the connecting screw 4 to rotate forward or reverse. The connecting screw 4, in conjunction with the transmission screw sleeve 3, drives the sliding sleeve 2 to slide left and right on the horizontal outer wall of the guide frame 25, thereby adjusting the lower press-fitting mold 8 to the designated area. This method allows for rapid adjustment during reprocessing and allows for the quick installation of a matching lower press-fitting mold 8 according to the requirements of the composite insulator skirts.

[0030] Reference Figure 1 and Figure 2 The lower pressing mold 8 has symmetrically fixed connecting cavities 11 on both outer walls, and guide blocks 10 are inserted into the top of the connecting cavities 11. The guide blocks 10 are symmetrically fixed on both outer walls of the upper pressing mold 9. The bottom of the upper pressing mold 9 abuts against the top of the lower pressing mold 8. The rear end of the upper pressing mold 9 is provided with an injection tube for injecting molten silicone rubber. The upper pressing mold 9 is made of magnetic material. The top of the upper pressing mold 9 is provided with a connecting cover 12, and the bottom of the connecting cover 12 covers the upper part of the upper pressing mold 9. The inner wall of one side of the connecting cover 12 is symmetrically fixed with an inflatable fitting balloon 13. The outer wall of one side of the fitting balloon 13 is fixedly connected to one end of an electromagnetic block 14, and the other end of the electromagnetic block 14 is attached to the outer wall of the upper pressing mold 9 and magnetically attracted. The electromagnetic block 14 is a NEODYMIUM magnet.

[0031] During the pressing operation of the composite insulator skirt, the guide block 10 and the connecting cavity 11 are aligned one-to-one and inserted. The upper pressing mold 9 and the lower pressing mold 8 are positioned relative to each other. The connecting cover 12 is placed over the top of the upper pressing mold 9. The fitting ball 13 inside the connecting cover 12 pushes one end of the electromagnetic block 14 to fit against the outer wall of the upper pressing mold 9. When the electromagnetic block 14 is energized, it magnetically attracts the outer wall of the upper pressing mold 9, thereby connecting the connecting cover 12 and the upper pressing mold 9. This improves the stability of the upper pressing mold 9 during the pressing operation and allows for quick separation between the upper pressing mold 9 and the connecting cover 12, as well as between the upper pressing mold 9 and the lower pressing mold 8. This improves the practicality of the process and avoids the limitations of traditional processing equipment.

[0032] Reference Figure 1 , Figure 3 and Figure 4 A movable sleeve 16 is installed on the vertical outer wall of the operating table 1. The movable sleeve 16 is vertically and movably connected to the vertical outer wall of the operating table 1. A pressing component 15 is fixedly connected to the top of the movable sleeve 16. The bottom outer wall of the pressing component 15 abuts against the top outer wall of the connecting cover 12. A connecting block 17 is fixedly connected to one side outer wall of the movable sleeve 16. The bottom end of the connecting block 17 is fixedly connected to the output end of the cylinder 18, and the cylinder 18 is fixedly connected to the vertical outer wall of the operating table 1. A flexible clamping structure is fixedly connected to the other side outer wall of the movable sleeve 16. The flexible clamping structure includes at least an installation cavity 19, a wrapping balloon 20, and an elastic sheet 21. The installation cavity 19 is fixedly connected to the other side outer wall of the movable sleeve 16. The inner wall of the installation cavity 19 is fixed. A ring-shaped balloon 20 is connected to the balloon. The inner wall of the balloon 20 with a larger diameter is fixedly connected with an arc-shaped elastic sheet 21 at equal intervals. The elastic sheet 21 is made of nickel-based high-temperature elastic alloy material with an elastic coefficient of 100-300 N / m. A silicone anti-slip pad 22 is adhered and fixed to the outer wall of the balloon 20 near the center point of the installation cavity 19. An inflation device 23 is fixedly connected to the top of the installation cavity 19. The inflation device 23 has inflation and deflation functions. The inflation device 23 is model PCL031. Transmission tubes 24 are inserted and fixed to both output ends of the inflation device 23. The other end of the transmission tube 24 passes through the outer wall of the installation cavity 19 and is connected to the balloon 20.

[0033] During the core fixing process, one end of the core is inserted into the installation cavity 19 and positioned at the center of the wrapping balloon 20, thereby compressing the wrapping balloon 20 and generating pressure. The potential energy generated by the pressure limits one end of the core. Then, according to the size of one end of the core, gas is injected into the wrapping balloon 20 through the inflation device 23 and the transmission pipe 24, further improving its fit and flexible clamping effect. After processing, the core can be quickly removed by expelling the gas from the wrapping balloon 20. Before the composite insulator skirt is pressed in, the cylinder 1... The output end of cylinder 8 outputs work, driving the movable sleeve 16 to move vertically downward on the operating table 1, so that the core body fits with the lower pressing mold 8, and driving the lower pressing assembly 15 to press down the upper pressing mold 9, so that the lower pressing mold 8 and the upper pressing mold 9 perform pressing operations. At the same time, after the composite insulator skirt is pressed, the output end of cylinder 18 outputs work, driving the movable sleeve 16 to move vertically upward on the outer wall of the operating table 1, thereby causing the mounting cavity 19 to move the core body upward and separate it from the lower pressing mold 8. In this way, the lower pressing mold 8 can be adjusted to the next area, or the core body can be directly removed.

[0034] Reference Figure 5 The pressing assembly 15 includes a pressing plate 1501, a rotating shaft 1502, a transmission plate 1503, and a limiting rod 1504. The bottom outer wall of the pressing plate 1501 abuts against the top outer wall of the connecting cover 12. A transmission plate 1503 is provided at one end of the pressing plate 1501. The rotating shaft 1502 is hinged to the end of the transmission plate 1503 near the pressing plate 1501. The end of the pressing plate 1501 near the transmission plate 1503 is fixedly connected to the rotating shaft 1502. The limiting rod 1504 is inserted through the rotating shaft 1502.

[0035] When the composite insulator skirt is pressed, the limiting rod 1504 is inserted into the inside of the rotating shaft 1502 to limit the rotating shaft 1502, preventing the lower pressure plate 1501 from rotating through the rotating shaft 1502. This allows the transmission plate 1503 to move vertically while simultaneously driving the lower pressure plate 1501 to move vertically. When it is necessary to disassemble or adjust the position of the upper pressing mold 9, the limiting rod 1504 is separated from the rotating shaft 1502, causing the lower pressure plate 1501 to rotate upwards. This prevents the lower pressure plate 1501 from contacting the connecting cover 12, thus allowing for the disassembly or adjustment of the position of the upper pressing mold 9.

[0036] The implementation principle of the adjustable composite insulator skirt pressing mechanism in this application embodiment is as follows: First, one end of the core is inserted into the interior of the mounting cavity 19 and placed in the center of the wrapping balloon 20, thereby compressing the wrapping balloon 20 and generating pressure. The potential energy generated by the pressure is used to limit one end of the core. Then, according to the size of one end of the core, gas is injected into the wrapping balloon 20 through the inflation device 23 and the transmission tube 24 to further improve its fit and flexible clamping effect. Secondly, select a suitable lower pressing mold 8 according to the required size of the composite insulator, and insert the lower pressing mold 8 into the top of the insertion cavity 6 through the insertion blocks 7 fixed on both outer walls, so that the lower pressing mold 8 is connected to the sliding sleeve 2, and press it into the core area as required. Secondly, the connecting screw 4, in conjunction with the transmission screw sleeve 3, drives the sliding sleeve 2 to slide left and right on the horizontal outer wall of the guide frame 25, thereby adjusting the lower pressing mold 8 to the designated area, and the guide block 10 and the connecting cavity 11 correspond one-to-one and complete the insertion, so that the upper pressing mold 9 and the lower pressing mold 8 are aligned. By covering the top of the upper pressing mold 9 with the connecting cover 12, the fitting ball 13 set inside the connecting cover 12 pushes one end of the electromagnetic block 14 to fit against the outer wall of the upper pressing mold 9. When the electromagnetic block 14 is energized, it magnetically attracts the outer wall of the upper pressing mold 9, thereby connecting the connecting cover 12 and the upper pressing mold 9. Finally, the material is injected through the injection pipe at the rear end of the upper pressing mold 9, which is used to inject molten silicone rubber. After cooling and other steps, the composite insulator skirt is pressed and installed. The output end of the cylinder 18 outputs the work, which drives the movable sleeve 16 to move on the upward vertical outer wall of the operating table 1. This causes the mounting cavity 19 to move the core upward and separate it from the lower pressing mold 8. In this way, the lower pressing mold 8 can be adjusted to the next area, or the core can be directly removed. Thus, the adjustable composite insulator skirt pressing mechanism is completed.

[0037] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An adjustable composite insulator skirt pressing mechanism, characterized in that: The system includes an operating table (1), inside which a lower pressing mold (8) is provided, and above the lower pressing mold (8) an upper pressing mold (9) is provided. The bottom end of the upper pressing mold (9) abuts against the bottom end of the lower pressing mold (8). A connecting cover (12) is provided at the top of the upper pressing mold (9), and fitting balloons (13) are symmetrically installed on one inner wall of the connecting cover (12). The outer wall of the fitting balloons (13) away from the inner wall of the connecting cover (12) is fitted with... An electromagnetic block (14) is installed, and the magnetic end of the electromagnetic block (14) abuts against and magnetically attracts the outer wall of the upper pressing mold (9). The upper pressing mold (9) is made of magnetic material. A pressing component (15) is provided at the top of the connecting cover (12). The bottom end of the pressing component (15) abuts against the top of the connecting cover (12). A movable sleeve (16) is movably connected to the vertical outer wall of the operating table (1), and a flexible clamping structure is installed on one side of the outer wall of the movable sleeve (16).

2. The adjustable composite insulator skirt pressing mechanism according to claim 1, characterized in that: The bottom of the operating table (1) is equipped with a guide frame (25), and the top horizontal outer wall of the guide frame (25) is equipped with a sliding sleeve (2) that can slide left and right.

3. The adjustable composite insulator skirt pressing mechanism according to claim 2, characterized in that: The bottom end of the sliding sleeve (2) is equipped with a transmission screw sleeve (3), and the inside of the guide frame (25) is equipped with a connecting screw (4), which is connected to the inside of the transmission screw sleeve (3) through the transmission screw sleeve (3). The connecting screw (4) is rotatably connected to the bottom end of the inside of the guide frame (25).

4. The adjustable composite insulator skirt pressing mechanism according to claim 3, characterized in that: A motor (5) is installed on one side of the outer wall of the guide frame (25), and the output end of the motor (5) passes through the corresponding side wall of the guide frame (25). The motor (5) is connected to the corresponding end of the connecting screw (4) in a transmission connection.

5. The adjustable composite insulator skirt pressing mechanism according to claim 2, characterized in that: The top of the sliding sleeve (2) is symmetrically equipped with a plug cavity (6), and the top of the plug cavity (6) is equipped with a plug block (7). The plug block (7) is symmetrically installed on both sides of the outer wall of the lower pressing mold (8).

6. The adjustable composite insulator skirt pressing mechanism according to claim 1, characterized in that: The lower pressing mold (8) has symmetrically installed connecting cavities (11) on both outer walls, and the upper pressing mold (9) has symmetrically installed guide blocks (10) on both outer walls, with the bottom end of the guide blocks (10) inserted into the top end of the connecting cavity (11).

7. The adjustable composite insulator skirt pressing mechanism according to claim 1, characterized in that: The other end of the pressing component (15) is connected to the top of the movable sleeve (16). A connecting block (17) is installed on one side of the outer wall of the movable sleeve (16). A cylinder (18) is installed on the vertical outer wall of the operating table (1). The bottom end of the connecting block (17) is connected to the output end of the cylinder (18).

8. The adjustable composite insulator skirt pressing mechanism according to claim 1, characterized in that: The flexible clamping structure includes at least an installation cavity (19), a wrapping balloon (20), and elastic sheets (21). One outer wall of the installation cavity (19) is connected to the outer wall of the movable sleeve (16). The wrapping balloon (20) is installed inside the installation cavity (19). Elastic sheets (21) are arranged at equal intervals inside the wrapping balloon (20). A silicone anti-slip pad (22) is adhered to the outer wall of the wrapping balloon (20) near the center point inside the installation cavity (19). An inflation device (23) is installed at the top of the installation cavity (19), and transmission pipes (24) are installed at both output ends of the inflation device (23). The other end of the transmission pipe (24) is connected to the wrapping balloon (20).

9. The adjustable composite insulator skirt pressing mechanism according to claim 1, characterized in that: The pressing assembly (15) includes at least a pressing plate (1501) and a transmission plate (1503). The bottom end of the pressing plate (1501) abuts against the top end of the connecting cover (12). One end of the pressing plate (1501) is provided with a transmission plate (1503). The transmission plate (1503) is hinged to a rotating shaft (1502) near the end of the pressing plate (1501). The other end of the pressing plate (1501) is connected to the rotating shaft (1502). The rotating shaft (1502) is inserted through a limit rod (1504).

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