Pressure resistance testing device suitable for asphalt block

Abstract

The invention discloses a pressure resistance testing device suitable for asphalt blocks, which comprises a base, a moving mechanism mounted in the base, a pressure bearing plate mounted at the power output end of the moving mechanism, supporting frames mounted on two sides of the top of the base, a supporting plate mounted on the tops of the supporting frames, and a pressure applying mechanism mounted in the supporting plate. The outer side of the pressure applying mechanism is connected with a heating assembly, the pressure applying mechanism is connected with a pressure control system, the heating assembly is connected with a temperature control system, and the pressure control system and the temperature control system are connected with a central processing unit. The heating assembly is matched with the temperature control system, summer high temperature can be simulated, the working condition of an asphalt block in an actual high-temperature use scene can be truly simulated, test data is more practical, and the reliability and reference value of a test result are effectively improved; by arranging the pressure control system, the hydraulic cylinder can be accurately adjusted, the working state of the hydraulic cylinder can be adjusted in time according to the actual pressure condition, and high-precision pressure application control is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt block pressure resistance testing, and particularly relates to a pressure resistance testing device suitable for asphalt blocks. Background Art

[0002] In engineering fields such as road construction, asphalt is an important building material. The quality of its performance directly affects the service life and quality of the road. Among them, the pressure resistance of asphalt blocks is one of the key indicators for measuring asphalt quality. Before the asphalt blocks are put into use, the pressure resistance of the hardened asphalt blocks needs to be tested.

[0003] The compression resistance test can directly reflect, evaluate or judge the pressure resistance of asphalt blocks, so as to determine the pressure resistance of asphalt blocks and the scope of use of asphalt blocks. However, the existing asphalt block pressure resistance testing device can only perform pressure tests on asphalt blocks under normal temperature during the test process, and cannot simulate high temperature environments. The obtained test data has a large deviation from the actual usage scenario and cannot truly reflect the pressure resistance of asphalt blocks under high temperatures in summer. In addition, during the pressure application process, the existing testing device is difficult to accurately control the size and speed of pressure, and lacks an effective pressure feedback mechanism, which cannot meet the needs of high-precision pressure resistance testing of asphalt blocks. Summary of the Invention

[0004] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a pressure resistance testing device suitable for asphalt blocks.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows: A pressure resistance testing device for asphalt blocks, comprising a base, a moving mechanism installed in the base, a pressure plate installed at the power output end of the moving mechanism, support frames installed on both sides of the top of the base, a support plate installed on the top of the support frame, a pressure mechanism installed in the support plate, a heating component connected to the outside of the pressure mechanism, a pressure control system connected to the pressure mechanism, a temperature control system connected to the heating component, and a central processing unit connected to the pressure control system and the temperature control system; The pressure-applying mechanism includes a hydraulic cylinder, and a pressure-applying component is connected to the power output end of the hydraulic cylinder; The heating assembly includes a heating box sleeved on the outside of the pressure assembly, the bottom of the heating box is provided with an opening matching the shape of the pressure plate, the inner side of the heating box is provided with an assembly groove, and the heating layer is installed in the assembly groove; The pressure control system includes a pressure sensor, a pressure control module and a hydraulic cylinder control module. The pressure sensor is installed in the pressure assembly, the pressure sensor is connected to the pressure control module, the pressure control module is connected to the hydraulic cylinder control module, and the hydraulic cylinder control module is connected to the hydraulic cylinder; The temperature control system includes a temperature sensor, a temperature control module and a heating layer control module. The temperature sensor is installed in the heating box, the temperature sensor is connected to the temperature control module, the temperature control module is connected to the heating layer control module, and the heating layer control module is connected to the heating layer.

[0006] The pressure-applying assembly further comprises a movable plate and an assembly plate, with the pressure sensor mounted between the movable plate and the assembly plate. The top of the movable plate is mounted at the power output of the hydraulic cylinder, and a pressure plate is mounted at the bottom of the assembly plate. This structural design facilitates the installation of the pressure sensor for subsequent pressure detection when applying pressure to the asphalt block.

[0007] Furthermore, guide posts are mounted on four sides of the top of the assembly plate. The tops of the guide posts extend sequentially through the movable plate, the heating box, and the support plate. Wear-resistant guide sleeves are slidably mounted on the guide posts, and the wear-resistant guide sleeves are mounted on the support plate. This structural design ensures vertical movement of the pressure assembly, ensuring more uniform pressure on the surface of the asphalt block.

[0008] It is further defined that the heating layer is a nano-carbon fiber heating film. Such a structural design can achieve rapid and uniform heating.

[0009] It is further defined that the central processing unit is connected to a display screen and an operation keyboard, and the central processing unit includes a power module and a storage module, and the central processing unit is connected to the power module and the storage module. Such a structural design facilitates operation control and easy viewing of pressure and temperature values.

[0010] The movable mechanism further defines that the movable mechanism includes a drive motor mounted on the outside of the base, a screw connected to the power output end of the drive motor, bearings mounted on both sides of the screw, the bearings mounted in the base, the screw connected to a nut movable seat, a movable frame mounted on the top of the nut movable seat, a movable plate mounted on the top of the movable frame, and the pressure plate mounted on the movable plate. This structural design facilitates the movement of the pressure plate and facilitates the placement and removal of asphalt blocks on the pressure plate.

[0011] It is further defined that slides are installed on both sides of the bottom of the movable plate, the slides are slidably connected to slide rails, the bottoms of the slide rails are installed with support seats, and the support seats are installed in the base. Such a structural design ensures the smooth movement of the pressure plate.

[0012] Furthermore, screws are installed on all four sides of the pressure plate and the pressure plate, and the pressure plate and the pressure plate are fixed to the movable plate and the assembly plate by screws. Such a structural design facilitates disassembly and replacement of the pressure plate and the pressure plate when they are damaged after long-term use.

[0013] It is further defined that accordion covers are installed on both sides of the bottom of the movable plate, and the other side of the accordion covers is installed on the inner wall of the base. Such a structural design can prevent the asphalt block from falling into the base during the pressure test.

[0014] Furthermore, a clamping assembly is mounted on the top of the pressure plate. The clamping assembly includes a side plate, a driving member for providing lateral driving force is mounted in the center of the side plate, and the driving member is connected to a clamping plate. Guide rods are mounted on both sides of the clamping plate, and the guide rods are slidably mounted on the side plate. This structural design can also clamp and secure the asphalt block.

[0015] The beneficial effects of the present invention are: 1. By providing a heating component and coordinating with a temperature control system, the present invention can precisely control the temperature inside the heating box to simulate summer high temperatures (60°C - 80°C). Compared with existing devices that can only test at room temperature, this device can truly simulate the working conditions of asphalt blocks in actual high-temperature usage scenarios, making the test data more realistic and effectively improving the reliability and reference value of the test results; 2. The present invention sets up a pressure control system, and the pressure sensor monitors the pressure of the pressure component on the asphalt block in real time, and transmits the signal to the pressure control module, and then accurately adjusts the extension and contraction speed and pressure of the hydraulic cylinder through the hydraulic cylinder control module. It has a complete pressure feedback mechanism, which can adjust the working state of the hydraulic cylinder in time according to the actual pressure conditions, realize high-precision pressure application control, meet the needs of high-precision pressure resistance testing of asphalt blocks, and significantly improve test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings; Figure 1 This is a schematic diagram of the axial structure of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional structural diagram of a moving mechanism of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of a pressure mechanism of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of a pressure-bearing plate of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a horizontal cross-sectional structure of a clamping assembly of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the connection structure of a central processing unit of a pressure resistance testing device for asphalt blocks according to an embodiment of the present invention; The main component symbols are described as follows: Base 1, moving mechanism 2, pressure plate 3, support frame 4, support plate 5; Pressure mechanism 6, hydraulic cylinder 601, pressure assembly 602, movable plate 603, assembly plate 604, pressure plate 605, guide column 606, wear-resistant guide sleeve 607; Heating assembly 7, heating box 701, opening 702, assembly groove 703, heating layer 704; Pressure control system 8, pressure sensor 801, pressure control module 802, hydraulic cylinder control module 803; Temperature control system 9, temperature sensor 901, temperature control module 902, heating layer control module 903; Central processing unit 10, display screen 11, operation keyboard 12, power module 13, storage module 14, drive motor 15, screw 16, bearing 17, nut moving seat 18, moving frame 19, moving plate 20, slide seat 21, slide rail 22, support seat 23, screw 24, accordion cover 25, clamping assembly 26, side panel 27, drive part 28, splint 29, guide rod 30. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1, as Figure 1 、 Figure 2 and Figure 6 As shown, a pressure resistance testing device suitable for asphalt blocks is provided. A moving mechanism 2 is installed in a base 1. A pressure plate 3 is installed at the power output end of the moving mechanism 2. Support frames 4 are installed on both sides of the top of the base 1. A support plate 5 is installed on the top of the support frame 4. A pressure mechanism 6 is installed in the support plate 5. A heating component 7 is connected to the outside of the pressure mechanism 6. The pressure mechanism 6 is connected to a pressure control system 8. The heating component 7 is connected to a temperature control system 9. The pressure control system 8 and the temperature control system 9 are connected to a central processing unit 10. The pressure mechanism 6 includes a hydraulic cylinder 601, and the power output end of the hydraulic cylinder 601 is connected to a pressure component 602; The heating assembly 7 includes a heating box 701 sleeved on the outside of the pressure assembly 602. The bottom of the heating box 701 is provided with an opening 702 that matches the shape of the pressure plate 3. The inner side of the heating box 701 is provided with an assembly groove 703, and the heating layer 704 is installed in the assembly groove 703. The pressure control system 8 includes a pressure sensor 801, a pressure control module 802, and a hydraulic cylinder control module 803. The pressure sensor 801 is installed in the pressure assembly 602. The pressure sensor 801 is connected to the pressure control module 802. The pressure control module 802 is connected to the hydraulic cylinder control module 803. The hydraulic cylinder control module 803 is connected to the hydraulic cylinder 601. The temperature control system 9 includes a temperature sensor 901, a temperature control module 902 and a heating layer control module 903. The temperature sensor 901 is installed in the heating box 701, the temperature sensor 901 is connected to the temperature control module 902, the temperature control module 902 is connected to the heating layer control module 903, and the heating layer control module 903 is connected to the heating layer 704.

[0019] In this embodiment, during operation, the moving mechanism 2 drives the pressure plate 3 to move to the outside, and the operator places the asphalt block on the pressure plate 3. Then the moving mechanism 2 drives the pressure plate 3, and the pressure plate 3 drives the asphalt block to move to the inside and is located on the lower side of the pressure mechanism 6. Then the pressure mechanism 6 is started, so that the hydraulic cylinder 601 pushes the pressure component 602 to move downward. When the pressure component 602 moves downward, it will drive the heating component 7 to move downward, so that the heating box 701 moves downward and is installed on the outside of the pressure plate 3 through the opening 702. At this time, the pressure mechanism 6 stops working, and the heating layer control module 903 of the temperature control system 9 controls the heating layer 704 to start. The temperature sensor 901 monitors the temperature in the heating box 701 in real time and transmits the temperature signal to the temperature control module 902. The temperature control module 902 adjusts the temperature according to the preset temperature value (simulating the high temperature environment of hot weather in summer, such as 60°C). -80℃), the heating power of the heating layer 704 is controlled by the heating layer control module 903 to achieve precise control of the temperature in the heating box. When the temperature sensor 901 detects that the ambient temperature in the heating box 701 reaches a suitable value, the pressure-applying mechanism 6 is started again, causing the hydraulic cylinder 601 to push the pressure-applying component 602 to press on the asphalt block, while the heating component 7 remains stationary. After the pressure-applying component 602 presses on the asphalt block, the pressure sensor 801 in the pressure-applying component 602 monitors the pressure in real time and transmits the pressure signal to the pressure control module 802. The pressure control module 802 adjusts the extension and contraction speed and pressure of the hydraulic cylinder 601 through the hydraulic cylinder control module 803 according to the preset pressure test parameters to achieve precise control of the pressure application process. At the same time, it has a pressure feedback mechanism, which can adjust the working state of the hydraulic cylinder 601 in time according to the actual pressure situation, thereby greatly improving the accuracy of the pressure resistance test. Finally, the pressure control system 8 and the temperature control system 9 send the parameter information to the central processor 10 for the operator to view.

[0020] Example 2, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure on the basis of embodiment 1: the pressure component 602 includes a movable plate 603 and an assembly plate 604, the pressure sensor 801 is installed between the movable plate 603 and the assembly plate 604, the top of the movable plate 603 is installed at the power output end of the hydraulic cylinder 601, and the bottom of the assembly plate 604 is installed with a pressure plate 605.

[0021] In this embodiment, when in use, the hydraulic cylinder 601 pushes the movable plate 603, the movable plate 603 pushes the pressure sensor 801, the pressure sensor 801 pushes the assembly plate 604, and the assembly plate 604 pushes the pressure plate 605 to press on the asphalt block, thereby facilitating the pressure resistance test of the asphalt block.

[0022] Example 3, as Figure 3As shown, this embodiment adds the following structure on the basis of embodiment 2: guide columns 606 are installed on the four sides of the top of the assembly plate 604, and the top of the guide column 606 passes through the movable plate 603, the heating box 701 and the support plate 5 in sequence. The guide column 606 is slidably installed with a wear-resistant guide sleeve 607, and the wear-resistant guide sleeve 607 is installed on the support plate 5.

[0023] In this embodiment, when the hydraulic cylinder 601 pushes the movable plate 603, the movable plate 603 pushes the pressure sensor 801, the pressure sensor 801 pushes the assembly plate 604, and the assembly plate 604 pushes the pressure plate 605 to move, the assembly plate 604 will synchronously drive the guide column 606 to move along the wear-resistant guide sleeve 607, thereby ensuring the verticality of the movement of the assembly plate 604, and when the movable plate 603 drives the heating box 701 to move downward, the heating box 701 is installed on the outside of the pressure plate 3 through the opening 702, and when the movable plate 603 moves downward again, the guide column 606 performs a guiding movement in the wear-resistant guide sleeve 607 and at the penetration point of the heating box 701.

[0024] Example 4, as Figure 2 、 Figure 3 and Figure 4 As shown, this embodiment adds the following structure on the basis of embodiment 1: the heating layer 704 is a nano-carbon fiber heating film.

[0025] In this embodiment, by setting the heating layer 704 as a nano-carbon fiber heating film, rapid and uniform heating can be achieved, which can effectively simulate the hot weather environment in summer and improve the consistency between the test results and the actual usage scenarios.

[0026] Example 5, as Figure 6 As shown, this embodiment adds the following structure on the basis of embodiment 1: the central processing unit 10 is connected to the display screen 11 and the operation keyboard 12, the central processing unit 10 includes a power module 13 and a storage module 14, and the central processing unit 10 is connected to the power module 13 and the storage module 14.

[0027] In this embodiment, when in use, power is supplied by the power module 13, the preset values ​​of the temperature control module 902 and the pressure control module 802 can be adjusted and controlled by operating the keyboard 12, the real-time values ​​can be displayed by the display screen 11, and the values ​​can be stored by the storage module 14 for subsequent retrieval and inquiry.

[0028] Example 6, as Figure 2 、 Figure 3 and Figure 4As shown, this embodiment adds the following structure on the basis of embodiment 1. The moving mechanism 2 includes a driving motor 15 installed on the outside of the base 1. The power output end of the driving motor 15 is connected to a screw 16. Bearings 17 are installed on both sides of the screw 16. The bearings 17 are installed in the base 1. The screw 16 is connected to a nut moving seat 18. A moving frame 19 is installed on the top of the nut moving seat 18. A moving plate 20 is installed on the top of the moving frame 19. The pressure plate 3 is installed on the moving plate 20. In this embodiment, when in use, by starting the drive motor 15, the drive motor 15 drives the screw rod 16 to rotate along the bearings 17 on both sides, the rotating screw rod 16 drives the nut moving seat 18, the nut moving seat 18 drives the moving frame 19, the moving frame 19 drives the moving plate 20, and the moving plate 20 drives the pressure plate 3 to move back and forth in the base 1, so that the operator can place and remove the asphalt block on the pressure plate 3.

[0029] Example 7, as Figure 3 As shown, this embodiment adds the following structure on the basis of embodiment 6: slide seats 21 are installed on both sides of the bottom of the movable plate 20, the slide seats 21 are slidably connected to the slide rails 22, and a support seat 23 is installed at the bottom of the slide rails 22, and the support seat 23 is installed in the base 1.

[0030] In this embodiment, during the movement of the movable plate 20 , the slide 21 is synchronously driven to slide along the slide rail 22 , thereby ensuring the stability of the movement of the pressure plate 3 driven by the movable plate 20 .

[0031] Example 8, as Figure 3 and Figure 4 As shown, this embodiment adds the following structure on the basis of Embodiment 2 and Embodiment 7, screws 24 are installed on the four sides of the pressure plate 3 and the pressure plate 605, and the pressure plate 3 and the pressure plate 605 are fastened and installed on the movable plate 20 and the assembly plate 604 by the screws 24.

[0032] In this embodiment, the pressure plate 3 and the pressure plate 605 are locked and installed on the movable plate 20 and the assembly plate 604 by screws 24. When the pressure plate 3 and the pressure plate 605 are damaged after long-term use, the pressure plate 3 and the pressure plate 605 can be disassembled by screws 24 for quick replacement.

[0033] Example 9, as Figure 4 As shown, this embodiment adds the following structure based on Example 6: accordion covers 25 are installed on both sides of the bottom of the movable plate 20, and the other side of the accordion covers 25 is installed on the inner wall of the base 1. This structural design can prevent asphalt blocks from falling into the base 1 during the pressure test.

[0034] In this embodiment, during the movement of the movable plate 20, the movable plate 20 will squeeze and fold the accordion cover 25 on one side and stretch the accordion cover 25 on the other side, so that the movable plate 20 and the accordion covers 25 on both sides can seal the base 1 and prevent fragments and impurities from falling into the base 1.

[0035] Example 10, as Figure 1 and Figure 5 As shown, this embodiment adds the following structure on the basis of embodiment 1: a clamping assembly 26 is also installed on the top of the pressure plate 3, and the clamping assembly 26 includes a side plate 27. A driving member 28 for providing a lateral driving force is installed in the center of the side plate 27, and the driving member 28 is connected to a splint 29. Guide rods 30 are installed on both sides of the splint 29, and the guide rods 30 are slidably installed on the side plate 27.

[0036] In this embodiment, when in use, the clamping assembly 26 can also be used to clamp and fix the asphalt block. The driving member 28 drives the clamping plate 29 to move toward the middle to clamp the asphalt block. When the clamping plate 29 moves toward the middle, it will drive the guide rods 30 on both sides to slide along the side plate 27 to ensure the stability of the movement of the clamping plate 29.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A pressure resistance testing device for asphalt blocks, characterized by: The invention comprises a base (1), wherein a moving mechanism (2) is installed in the base (1), a pressure plate (3) is installed at the power output end of the moving mechanism (2), support frames (4) are installed on both sides of the top of the base (1), a support plate (5) is installed on the top of the support frame (4), a pressure mechanism (6) is installed in the support plate (5), the outer side of the pressure mechanism (6) is connected to a heating component (7), the pressure mechanism (6) is connected to a pressure control system (8), the heating component (7) is connected to a temperature control system (9), and the pressure control system (8) and the temperature control system (9) are connected to a central processing unit (10); The pressure-applying mechanism (6) comprises a hydraulic cylinder (601), and a power output end of the hydraulic cylinder (601) is connected to a pressure-applying component (602); The heating assembly (7) comprises a heating box (701) sleeved on the outside of the pressure assembly (602); the bottom of the heating box (701) is provided with an opening (702) matching the shape of the pressure plate (3); the inner side of the heating box (701) is provided with an assembly groove (703); and a heating layer (704) is installed in the assembly groove (703); The pressure control system (8) comprises a pressure sensor (801), a pressure control module (802) and a hydraulic cylinder control module (803), wherein the pressure sensor (801) is installed in the pressure-applying assembly (602), the pressure sensor (801) is connected to the pressure control module (802), the pressure control module (802) is connected to the hydraulic cylinder control module (803), and the hydraulic cylinder control module (803) is connected to the hydraulic cylinder (601); The temperature control system (9) comprises a temperature sensor (901), a temperature control module (902) and a heating layer control module (903); the temperature sensor (901) is installed in the heating box (701); the temperature sensor (901) is connected to the temperature control module (902); the temperature control module (902) is connected to the heating layer control module (903); and the heating layer control module (903) is connected to the heating layer (704).

2. The pressure resistance testing device for asphalt blocks according to claim 1, characterized in that: The pressure-applying assembly (602) includes a movable plate (603) and an assembly plate (604), the pressure sensor (801) is installed between the movable plate (603) and the assembly plate (604), the top of the movable plate (603) is installed at the power output end of the hydraulic cylinder (601), and the bottom of the assembly plate (604) is installed with a pressure plate (605).

3. The pressure resistance testing device for asphalt blocks according to claim 2, characterized in that: Guide columns (606) are installed on the four sides of the top of the assembly plate (604), and the top of the guide column (606) passes through the movable plate (603), the heating box (701) and the support plate (5) in sequence. The guide column (606) is slidably installed with a wear-resistant guide sleeve (607), and the wear-resistant guide sleeve (607) is installed on the support plate (5).

4. The pressure resistance testing device for asphalt blocks according to claim 3, characterized in that: The heating layer (704) is a nano-carbon fiber heating film.

5. The pressure resistance testing device for asphalt blocks according to claim 4, characterized in that: The central processing unit (10) is connected to a display screen (11) and an operation keyboard (12). The central processing unit (10) includes a power module (13) and a storage module (14). The central processing unit (10) is connected to the power module (13) and the storage module (14).

6. The pressure resistance testing device for asphalt blocks according to claim 5, characterized in that: The moving mechanism (2) includes a driving motor (15) installed outside the base (1), a power output end of the driving motor (15) is connected to a screw rod (16), bearings (17) are installed on both sides of the screw rod (16), the bearings (17) are installed in the base (1), the screw rod (16) is connected to a nut moving seat (18), a moving frame (19) is installed on the top of the nut moving seat (18), a moving plate (20) is installed on the top of the moving frame (19), and the pressure plate (3) is installed on the moving plate (20).

7. The pressure resistance testing device for asphalt blocks according to claim 6, characterized in that: Slide seats (21) are installed on both sides of the bottom of the movable plate (20), and the slide seats (21) are slidably connected to slide rails (22). A support seat (23) is installed at the bottom of the slide rails (22), and the support seat (23) is installed in the base (1).

8. The pressure resistance testing device for asphalt blocks according to claim 7, characterized in that: Screws (24) are installed on four sides of the pressure plate (3) and the pressure plate (605), and the pressure plate (3) and the pressure plate (605) are locked and installed on the movable plate (20) and the assembly plate (604) through the screws (24).

9. The pressure resistance testing device for asphalt blocks according to claim 8, characterized in that: Organ covers (25) are installed on both sides of the bottom of the movable plate (20), and the other side of the organ cover (25) is installed on the inner wall of the base (1).

10. The pressure resistance testing device for asphalt blocks according to claim 9, characterized in that: A clamping assembly (26) is also installed on the top of the pressure plate (3), and the clamping assembly (26) includes a side plate (27). A driving member (28) for providing a lateral driving force is installed in the center of the side plate (27). The driving member (28) is connected to a clamping plate (29). Guide rods (30) are installed on both sides of the clamping plate (29), and the guide rods (30) are slidably installed on the side plate (27).

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