Welding wheel structure

Abstract

The utility model relates to the technical field of sealing gasket welding, in particular to a welding wheel structure which is characterized in that a plurality of welding wheels and a lifting driving device cooperatively work to realize precise welding, and the plurality of welding wheels are synchronously pushed by the lifting driving device to abut against a winding belt in the vertical direction to form a multi-point contact effect, so that the fitting degree of the welding wheels and the winding belt is remarkably improved; the lifting driving device can drive the welding wheel to abut against the winding belt along the radian of the sealing gasket, so that the lifting air cylinder drives the welding wheel to ascend at different heights, a plurality of contact points can be correspondingly formed along the radian of the sealing gasket, and the risks of deviation of a welding track and displacement of the welding wheel are effectively reduced; the welding quality and the yield of the sealing gasket are improved, and the performance, the service life and the appearance quality of the sealing gasket are further improved.

Description

Technical Field

[0001] This application relates to the field of gasket welding technology, and in particular to a welding wheel structure. Background Technology

[0002] A gasket is a component used to fill the gap between two or more mating surfaces to prevent fluid or gas leakage. It is widely used in various industrial fields. Welding is a crucial step in the production process of gaskets, and the quality of the gasket directly determines the performance and lifespan of the product.

[0003] In related technologies, refer to Figure 1 The welding of the spiral wound tape to the inner ring of the sealing gasket is widely carried out using a single welding wheel for contact welding. In this method, the single welding wheel and the spiral wound tape are in single-point contact. The welding wheel directly contacts the spiral wound tape, and by applying pressure and using welding energy, such as resistance heating or laser, the contact point between the steel strip and the inner ring is melted and connected, thereby realizing the welding operation. Furthermore, the welding accuracy can be improved by adjusting the welding parameters or optimizing the welding wheel design.

[0004] However, this method has the following drawbacks: due to the limitation of single-point contact between the welding wheel and the winding tape, the welding wheel is easily affected by external forces during the welding process, which can cause the welding position to shift, resulting in insufficient welding strength and affecting the performance, life and appearance quality of the sealing gasket. Utility Model Content

[0005] To address the aforementioned problems, this application provides a welding wheel structure.

[0006] The welding wheel structure provided in this application adopts the following technical solution:

[0007] A welding wheel structure is installed on a gasket welding equipment for welding a spiral wound tape to the inner ring of a gasket. The structure includes a plurality of welding wheels and a lifting drive device for driving the welding wheels to rise and fall. The plurality of welding wheels are arranged in parallel, and one welding wheel is driven to rise and fall by one of the lifting drive devices. The lifting drive device drives the welding wheel to rise and abut against the spiral wound tape and weld the spiral wound tape to the inner ring.

[0008] By adopting the above technical solution, after the winding tape is wrapped around the inner ring of the sealing gasket, each welding wheel is driven to rise by the lifting drive device and abut against the winding tape, welding the winding tape to the inner ring of the sealing gasket. Because several welding wheels are set, multiple contact points are achieved during welding, reducing the risk of welding trajectory and welding wheel deviation, improving welding quality and the yield of sealing gaskets, and further improving the performance, life and appearance quality of sealing gaskets.

[0009] Preferably, it also includes a support base, of which two support bases are provided, the lifting drive device is configured as a lifting cylinder, and two welding wheels and two lifting cylinders are provided. Each welding wheel is rotatably supported on a corresponding support base, and the piston rod of the lifting cylinder is fixedly connected to the lower surface of the support base.

[0010] By adopting the above technical solution, the welding wheel is rotated and supported by the bearing seat. The piston rod of the lifting cylinder is fixedly connected to the lower surface of the bearing seat. The piston rod of the lifting cylinder drives the bearing seat to move vertically, which in turn drives the welding wheel to move vertically, so that the welding wheel comes into contact with the winding tape. The two welding wheels come into contact with the winding tape synchronously under the push of the piston rod of the lifting cylinder, so that there are two contact points during welding. The two welding wheels can simulate the human hand to make contact with the winding tape at two points, which further forms two-point uniform pressure, so as to improve the fit between the welding wheel and the winding tape.

[0011] Preferably, the surface of the welding wheel is provided with a welding groove along the circumference, and when the welding wheel abuts against the winding tape, the winding tape is embedded in the welding groove.

[0012] By adopting the above technical solution, the winding tape is placed inside the welding groove to limit its position. This ensures that the contact surface between the winding tape and the welding wheel is subjected to uniform force and has a stable position during the welding process, effectively reducing welding deviation caused by external interference.

[0013] Preferably, it also includes a conductive connecting wire, one end of which is electrically connected to the welding wheel.

[0014] By adopting the above technical solution, the conductive connecting wire transmits electrical energy to the welding wheel, realizing the conversion of electrical energy into heat energy, so that the contact surface between the winding tape and the inner ring of the sealing gasket is uniformly heated and fused together.

[0015] Preferably, it also includes a support frame, which is fixedly connected to the sealing gasket welding equipment, and the lifting drive device is fixedly connected to the support frame.

[0016] By adopting the above technical solution, the support frame is fixedly connected to the sealing gasket welding equipment, and the lifting drive device is fixedly connected to the support frame, so that the lifting drive device is fixed on the sealing gasket welding equipment, reducing the risk of displacement caused by vibration of the lifting drive device during operation.

[0017] Preferably, the support frame includes a support plate and a fixing plate. The fixing plate is fixedly connected to the sealing gasket welding equipment. The support plate has a hollow structure. The bottom of the support plate is fixedly connected to the fixing plate, and the upper end of the support plate is clearance-fitted with the fixing plate.

[0018] By adopting the above technical solution, the fixing plate is fixed on the sealing gasket welding equipment, and the bottom of the bearing plate is fixedly connected to the fixing plate to provide support for the bearing plate. At the same time, the gap fit between the upper end of the bearing plate and the fixing plate allows the bearing plate to undergo elastic deformation while the lifting drive device drives the welding wheel to abut against the winding tape. Because the lifting drive device is fixedly connected to the bearing plate, the bearing plate will undergo elastic deformation, making the process of the welding wheel abutting against the winding tape more flexible. At the same time, the elastic deformation of the bearing plate has a certain range, which can limit the movement trajectory of the welding wheel abutting against the winding tape, further reducing the risk of welding wheel deviation.

[0019] Preferably, a first fixing component is provided between the support plate and one of the lifting drive devices. The support plate and one of the lifting drive devices are fixedly connected by the first fixing component. The first fixing component includes a nut, a threaded rod, and a connector. The surface of the lifting drive device has a pre-set mounting hole. One end of the threaded rod passes through the hollow area of ​​the support plate and through the mounting hole. The connector is threadedly engaged with the threaded rod and abuts against the outer wall of the support plate. The nut is threadedly engaged with the threaded rod and abuts against the connector.

[0020] By adopting the above technical solution, one end of the threaded rod is inserted into the mounting hole of the lifting drive device. At the same time, the connecting piece and the bolt thread engage, so that the connecting piece abuts against the outer wall of the bearing plate. The nut and the threaded rod thread engage, and the nut abuts against the connecting piece and is tightened, so that the connecting piece is locked and the lifting drive device is further fixed to the bearing plate. This ensures that while the lifting drive device drives the welding wheel to abut against the winding belt, the bearing plate undergoes elastic deformation. Within the elastic deformation range, the bearing plate can still maintain a stable connection with the lifting drive device, reducing the risk of displacement of the lifting drive device.

[0021] Preferably, a second fixing component is provided between the plurality of lifting drive devices, and the plurality of lifting drive devices are fixedly connected by the second fixing component. The second fixing component includes bolts and connecting blocks. The plurality of lifting drive devices are fixedly connected to the connecting blocks, and the connecting blocks are provided with threaded holes. The outer wall of the lifting drive device abuts against the connecting block, and the outer wall of each connecting block abuts against the connecting block. The bolts are sequentially inserted into the threaded holes and threadedly engaged with the connecting blocks.

[0022] By adopting the above technical solution, since multiple welding wheels are pushed by the lifting drive device to synchronously abut against the winding belt, multiple lifting drive devices are needed to drive the welding wheels. Several lifting drive devices are fixedly connected to connecting blocks. Bolts are inserted into the threaded holes in sequence to engage with the threaded connecting blocks and apply pre-tightening force to achieve synchronous fixation of multiple lifting drive devices.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By simultaneously pushing multiple welding wheels to contact the winding tape through the lifting drive device, multiple contact points are achieved during welding, which effectively reduces the risk of welding trajectory and welding wheel deviation and improves welding quality and yield, further enhancing the performance, life and appearance quality of the sealing gasket;

[0025] 2. The two welding wheels are rotated and supported by the bearing seat. The piston rod of the lifting cylinder is fixedly connected to the lower surface of the bearing seat. The piston rod of the lifting cylinder drives the bearing seat to move vertically, which in turn drives the welding wheels to move vertically, so that the welding wheels simultaneously abut against the winding tape to form two contact points. This simulates the pressure applied by a human hand to achieve uniform pressure distribution and improves the adhesion between the welding wheels and the winding tape.

[0026] 3. The support frame is fixedly connected to the sealing gasket welding equipment through the fixed plate. The bottom of the support plate is rigidly connected to the fixed plate and the upper end is clearance-fitted. The support plate undergoes elastic deformation, making the process of the welding wheel abutting against the winding tape more flexible. Attached Figure Description

[0027] Figure 1 This is a simplified schematic diagram of the background technology.

[0028] Figure 2 This is a simplified schematic diagram of an embodiment of this application.

[0029] Figure 3 This is a structural schematic diagram of an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the lifting drive device, welding wheel, bearing seat, and conductive connecting wire in the embodiments of this application.

[0031] Figure 5 yes Figure 4 An enlarged diagram of A in the diagram.

[0032] Figure 6 This is a schematic diagram of the reverse structure of an embodiment of this application.

[0033] Figure 7 yes Figure 6 Enlarged diagram of B in the diagram.

[0034] Figure 8 This is a front structural diagram of an embodiment of this application.

[0035] Figure 9 yes Figure 8 An enlarged diagram of C in the diagram.

[0036] Explanation of reference numerals in the attached drawings: 11, welding wheel; 111, welding groove; 12, lifting drive device; 121, mounting hole; 13, bearing seat; 14, conductive connecting wire; 2, bearing frame; 21, bearing plate; 22, fixing plate; 221, extension; 3, first fixing component; 31, nut; 32, threaded rod; 33, connector; 4, second fixing component; 41, bolt; 411, nut; 42, connecting block; 421, threaded hole. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0038] This application discloses a welding wheel structure. (Refer to...) Figure 3 A welding wheel structure is installed on a gasket welding equipment to weld a spiral wound tape to the inner ring of a gasket. The welding wheel 11 is a key component in the welding equipment and is usually used as an electrode. The welding wheel 11 heats the spiral wound tape to a molten state and combines it with the gasket to form a welded joint by passing an electric current through it, converting electrical energy into heat energy, and through the combined action of the welding wheel 11 and the spiral wound tape friction.

[0039] Reference Figure 4 Specifically, it includes several welding wheels 11, several bearing seats 13, and a lifting drive device 12 for driving the welding wheels 11 to rise and fall. In this embodiment, there are two welding wheels 11 and two bearing seats 13. The lifting drive device 12 is a lifting cylinder. The lifting cylinder is connected to an external air supply device. The welding wheels 11 are rotatably supported on the bearing seats 13. The two welding wheels 11 and the two bearing seats 13 are arranged side by side. The piston rod of the lifting cylinder is fixedly connected to the bearing seat 13.

[0040] Reference Figure 2 To further explain, during the spot welding process, after the winding assembly wraps the winding tape around the inner ring of the sealing gasket, the two welding wheels 11 simultaneously abut against the winding tape under the push of the piston rod of the lifting cylinder, achieving two contact points during welding. The two welding wheels 11 can simulate the human hand to achieve two-point contact with the winding tape, thereby further improving the fit between the welding wheels 11 and the winding tape, significantly reducing the risk of welding trajectory and welding wheel 11 deviation, improving welding quality and yield, and further improving the performance, life and appearance quality of the sealing gasket.

[0041] Reference Figure 5Furthermore, the surface of the welding wheel 11 is provided with a welding groove 111 along the circumferential direction. The welding groove 111 has a ring structure. When the welding wheel 11 abuts against the winding tape, the winding tape is placed inside the welding groove 111. The welding groove 111 limits the winding tape. The winding tape being placed inside the welding groove 111 ensures that the contact surface between the winding tape and the welding wheel 11 is subjected to uniform force and has a stable position during the welding process, further reducing the welding displacement of the winding tape caused by external force interference.

[0042] Meanwhile, the welding wheel 11 is connected to an external conductive device. The welding wheel structure also includes a conductive connecting line 14. In this embodiment, the conductive connecting line 14 is set as a copper conductive connecting line 14. One end of the copper conductive connecting line 14 is electrically connected to the welding wheel 11, and the other end is electrically connected to the external conductive device.

[0043] To further explain, the copper conductive connecting wire 14 has high electrical and thermal conductivity. Through its high electrical and thermal conductivity, it transmits electrical energy from the external conductive device to the welding wheel 11, realizing the conversion of electrical energy into heat energy, so that the contact surface between the winding tape and the inner ring of the sealing gasket is uniformly heated and fused together.

[0044] Furthermore, during the welding process, the wrapping tape needs to be fixed by spot welding at the beginning and end. The wrapping tape is wrapped around the inner ring of the sealing gasket. The bearing seat 13 supports the rotation of the welding wheel 11. The piston rod of the lifting cylinder drives the bearing seat 13 to rise and fall, which in turn drives the welding wheel 11 to rise and fall, so that the welding groove 111 of the welding wheel 11 is in close contact with the wrapping tape.

[0045] Furthermore, the welding wheel 11 rotates at high speed and rubs against the winding tape. Since the welding wheel 11 is connected to a conductive device, the electrical energy of the external conductive device is transmitted to the welding wheel 11 through the copper conductive connecting wire 14, and the electrical energy is converted into heat energy, causing the winding tape to melt at high temperature and combine with the inner ring contact surface of the sealing gasket. After the current stops and the friction of the welding wheel 11 stops, the welding area cools naturally, forming a strong joint.

[0046] In addition, a welding wheel structure also includes a support frame 2, a lifting drive device 12 is fixed on the support frame 2, and the support frame 2 is fixed on the sealing gasket welding equipment.

[0047] The support frame 2 is fixedly connected to the gasket welding equipment, and the lifting drive device 12 is fixed on the support frame 2, so that the welding wheel 11 and the support seat 13 are fixed on the gasket welding equipment, which reduces the risk of vibration and displacement of the lifting drive device 12, welding wheel 11 and support seat 13 during operation.

[0048] Reference Figure 6On the other hand, the support frame 2 includes a support plate 21 and a fixing plate 22. Specifically, the fixing plate 22 is fixedly connected to the sealing gasket welding equipment. One end of the bottom of the fixing plate 22 is provided with an extension 221, which is fixedly connected to the fixing plate 22. At the same time, one side of the bottom of the support plate 21 is vertically fixed to the extension 221. The support plate 21 has a hollow structure, and the upper end of the support plate 21 is clearance-fitted with the fixing plate 22.

[0049] Furthermore, a first fixing component 3 is provided between the support plate 21 and one of the lifting drive devices 12, and one of the lifting drive devices 12 is fixed to one side of the support frame 2 by the first fixing component 3, and the fixing plate 22 is located at the front end of the lifting drive device 12.

[0050] Reference Figure 7 Specifically, the first fixing component 3 includes a nut 31, a threaded rod 32, and a connector 33. The surface of the lifting drive device 12 has a pre-set mounting hole 121. One end of the threaded rod 32 passes through the hollow area on the side of the bearing plate 21 away from the fixing plate 22, and further passes through the mounting hole 121 of the lifting drive device 12 to connect with the lifting drive device 12. After the connector 33 is threadedly engaged with the threaded rod 32, the outer wall of one side of the connector 33 abuts against the outer wall of the bearing plate 21. Furthermore, after the nut 31 is threadedly engaged with the threaded rod 32, the outer wall of the nut 31 abuts against the outer wall of the other side of the connector 33.

[0051] This means that the outer wall of the nut 31 abuts against the outer wall of the connector 33 on the other side and is tightened. The nut 31 applies a preload force, so that the connector 33 abuts against the bearing plate 21 and locks it in place. This further fixes the lifting drive device 12 to the bearing plate 21. The width of the hollow area matches the diameter of the threaded rod 32. The hollow area limits the threaded rod 32.

[0052] Furthermore, this ensures that while the piston rod of the lifting drive device 12 drives the welding wheel 11 to abut against the winding tape along the arc of the sealing gasket, the bearing plate 21 undergoes elastic deformation. Within the range of elastic deformation, the bearing plate 21 can still maintain a stable connection with the lifting drive device 12, reducing the risk of displacement of the lifting drive device 12.

[0053] Reference Figure 8 On the other hand, in this embodiment, since there are two lifting drive devices 12, a second fixing component 4 is provided between the two lifting drive devices 12, and the two lifting drive devices 12 are fixedly connected by the second fixing component 4.

[0054] Reference Figure 9Specifically, in this embodiment, the second fixing component 4 includes a bolt 41 and a connecting block 42. The connecting block 42 is fixedly connected to the side wall of the lifting drive device 12 and is located on the side of the lifting drive device 12 away from the fixing plate 22. Each lifting drive device 12 is provided with two connecting blocks 42, which are arranged along the vertical direction of the lifting drive device 12. One side wall of the connecting block 42 is flush with the side wall of the lifting drive device 12.

[0055] Furthermore, when the side walls of the two lifting drive devices 12 abut, the side walls of the connecting blocks 42 of the two lifting drive devices 12 abut. The connecting blocks 42 are provided with threaded holes 421. The threaded holes 421 of the connecting blocks 42 of the two lifting drive devices 12 are connected. The bolts 41 are inserted into the two threaded holes 421 in sequence and are threadedly engaged with the connecting blocks 42. Furthermore, the nuts 411 of the bolts 41 abut against the side wall of one of the connecting blocks 42 to apply a preload, thereby achieving synchronous fixing of multiple lifting drive devices 12.

[0056] The implementation principle of a welding wheel structure in this application embodiment is as follows:

[0057] A welding wheel structure, installed on a gasket welding equipment, is used to weld spiral wound tape to the inner ring of a gasket. It includes several welding wheels, a lifting drive device, and a support frame. The lifting drive device is fixed to the support frame, which is in turn fixed to the gasket welding equipment. The support frame is fixedly connected to the gasket welding equipment, and the lifting drive device is also fixed to the support frame, thus reducing the risk of vibration and displacement of the lifting drive device during operation.

[0058] Two welding wheels and two lifting drive devices are provided. The lifting drive device is a lifting cylinder. The piston rod of the lifting cylinder is fixedly connected to the bottom outer wall of the support seat. The two ends of the welding wheel rotate and are supported on the support seat. Through the coordinated action of the two welding wheels and the drive of the lifting cylinder, high-precision welding of the sealing gasket and the winding tape is achieved.

[0059] During operation, an external air supply device powers the lifting cylinder, whose piston rod synchronously pushes two welding wheels vertically, causing the welding grooves on the wheel surfaces to contact the wrapping tape. This dual-wheel configuration creates two-point contact, simulating human hand contact, ensuring balanced force on the wrapping tape at both points. This improves the fit between the welding wheels and the wrapping tape, significantly reducing the risk of welding trajectory and wheel misalignment, thus enhancing welding quality and the yield rate of the sealing gaskets.

[0060] In addition, a welding wheel structure also includes a conductive connecting wire, which is made of copper. One end of the copper conductive connecting wire is electrically connected to the welding wheel, and the other end is electrically connected to an external conductive device. During the welding process, a welding groove is provided on the surface of the welding wheel.

[0061] This demonstrates that the copper conductive connecting wire transmits electrical energy from the external conductive device to the welding wheel. After the electrical energy is converted into heat energy, it is evenly transmitted to the contact surface between the winding tape and the sealing gasket through the welding groove, achieving precise welding. The limiting effect of the welding groove on the winding tape ensures that the welding surface is subjected to uniform force and reduces the deviation of the winding tape caused by external interference.

[0062] The support frame includes a support plate and a fixed plate. The fixed plate is fixedly connected to the sealing gasket welding equipment. One end of the bottom of the fixed plate is provided with an extension, which is fixedly connected to the fixed plate. At the same time, one side of the bottom of the support plate is perpendicularly fixed to the extension. The support plate has a hollow structure. The upper end of the support plate is clearance-fitted with the fixed plate. A first fixing component is provided between the support plate and one of the lifting drive devices. The first fixing component includes a nut, a threaded rod, and a connector. The surface of the lifting drive device has a pre-set mounting hole. One end of the threaded rod passes through the hollow area on the side of the support plate away from the fixed plate, further passes through the mounting hole of the lifting cylinder, and connects to the lifting drive device. After the connector is threadedly engaged with the threaded rod, the outer wall of one side of the connector abuts against the outer wall of the support plate. After the nut is threadedly engaged with the threaded rod, the outer wall of the nut abuts against the outer wall of the other side of the connector.

[0063] On the other hand, two connecting blocks are vertically arranged on the side of each lifting drive device away from the fixed plate. The connecting blocks are provided with threaded holes. When the side walls of the lifting drive devices are in contact, the side walls of the connecting blocks abut and the internal threaded holes are connected. The bolts are inserted into the threaded holes and tightened. Furthermore, the nuts of the bolts abut against the side wall of one of the connecting blocks to apply preload, thereby achieving synchronous fixing of multiple lifting drive devices.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding wheel structure, mounted on a gasket welding equipment, for welding spiral wound tape to the inner ring of a gasket, characterized in that, It includes several welding wheels (11) and a lifting drive device (12) for driving the welding wheels (11) to rise and fall. The several welding wheels (11) are arranged side by side. One welding wheel (11) is driven to rise and fall by one of the lifting drive devices (12). The lifting drive device (12) drives the welding wheel (11) to rise and abut against the winding tape and weld the winding tape to the inner ring.

2. The welding wheel structure according to claim 1, characterized in that, It also includes a support seat (13), two of which are provided. The lifting drive device (12) is a lifting cylinder. There are two welding wheels (11) and two lifting cylinders. The welding wheels (11) are rotatably supported on the corresponding support seat (13). The piston rod of the lifting cylinder is fixedly connected to the lower surface of the support seat (13).

3. The welding wheel structure according to claim 1, characterized in that, The surface of the welding wheel (11) is provided with a welding groove (111) along the circumferential direction. When the welding wheel (11) comes into contact with the winding tape, the winding tape is placed inside the welding groove (111).

4. The welding wheel structure according to claim 1, characterized in that, It also includes a conductive connecting line (14), which is electrically connected to the welding wheel (11).

5. The welding wheel structure according to claim 1, characterized in that, It also includes a support frame (2), which is fixedly connected to the sealing gasket welding equipment, and the lifting drive device (12) is fixedly connected to the support frame (2).

6. The welding wheel structure according to claim 5, characterized in that, The support frame (2) includes a support plate (21) and a fixing plate (22). The fixing plate (22) is fixedly connected to the sealing gasket welding equipment. The support plate (21) has a hollow structure. The bottom of the support plate (21) is fixedly connected to the fixing plate (22), and the upper end of the support plate (21) is clearance-fitted with the fixing plate (22).

7. The welding wheel structure according to claim 6, characterized in that, A first fixing component (3) is provided between the support plate (21) and one of the lifting drive devices (12). The support plate (21) and one of the lifting drive devices (12) are fixedly connected by the first fixing component (3). The first fixing component (3) includes a nut (31), a threaded rod (32), and a connector (33). The surface of the lifting drive device (12) is provided with a mounting hole (121). One end of the threaded rod (32) passes through the hollow area of ​​the support plate (21) and through the mounting hole (121). The connector (33) is threadedly engaged with the threaded rod (32) and abuts against the outer wall of the support plate (21). The nut (31) is threadedly engaged with the threaded rod (32) and abuts against the connector (33).

8. The welding wheel structure according to claim 7, characterized in that, A second fixing component (4) is provided between several of the lifting drive devices (12), and the several lifting drive devices (12) are fixedly connected by the second fixing component (4). The second fixing component (4) includes a bolt (41) and a connecting block (42). The several lifting drive devices (12) are fixedly connected to the connecting block (42). The connecting block (42) is provided with a threaded hole (421). The outer wall of the lifting drive device (12) abuts against the connecting block (42). The outer wall of each connecting block (42) abuts against the connecting block. The bolt (41) passes through the threaded hole (421) in sequence and engages with the threaded connection of the connecting block (42).

Images