Automatic cutting machine for pipe sealing ring
By designing an automatic pipe sealing ring cutting machine, the two-position clamping and automatic cutting of the pipe is achieved by using mechanisms such as three-jaw chucks and hydraulic cylinders, and the automatic separation and collection of the sealing ring and waste chips is achieved through the separation net and vibrator. The problem of unsolid fixing of the pipe and difficulty in automatic separation and collection in the prior art is solved, and the cutting quality and efficiency are improved.
Patent Information
- Application Number
- CN202420509762.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-15
AI Technical Summary
In the prior art, when cutting the sealing ring, the pipe is not firmly fixed, resulting in uneven cutting surfaces, low accuracy, and it is difficult to automatically separate and collect the sealing ring and waste chips.
An automatic pipe sealing ring cutting machine is designed, using mechanisms such as three-jaw chucks and hydraulic cylinders to achieve double-position clamping and fixing of the pipe, combining electric sliders and distance sensors to achieve automatic measurement and cutting, and automatic separation and collection of the sealing ring and waste chips are achieved through separation grids and vibrators.
The stable clamping of the pipe is achieved, ensuring the smoothness of the cutting surface and the improvement of the cutting quality. Automatic measurement and cutting greatly improve the accuracy and efficiency, and the problem of messy workbenches is solved through automatic separation and collection.
Smart Images
Figure CN222696144U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sealing ring processing, and in particular relates to an automatic cutting machine for pipeline sealing rings. Background Art
[0002] At present, when producing some types of pipes such as wire mesh pipes, it is necessary to use sealing rings to seal the pipe walls at both ends of the corresponding pipes to ensure the integrity of the pipe structure. The sealing rings are usually cut from the corresponding long straight pipes, and certain cutting equipment is required. When cutting, one end of the corresponding long straight pipe is generally clamped on a clamping mechanism such as a three-jaw chuck, and then the other end is cut using a cutting mechanism such as a cutting saw blade. However, in actual applications, when the original pipe is long, the clamping of one end of the pipe by the three-jaw chuck alone is not firm and stable enough. The fixed end of the pipe is far away from the cutting position, and the cutting end is prone to shaking, resulting in an uneven cutting surface. The cutting quality is not high, and it is often necessary to manually measure the required cutting length and manually control the alignment cutting, which has low accuracy and is time-consuming and labor-intensive, reducing the cutting efficiency. In addition, the cut sealing ring will fall on the workbench together with the waste generated during cutting, resulting in a messy workbench, which is inconvenient to separate and collect the sealing ring and waste, and needs to be improved. Utility Model Content
[0003] In view of this, the purpose of the utility model is to provide an automatic pipe sealing ring cutting machine, which can realize double-position clamping and fixing of the original pipe, automatic measurement and feeding cutting, and automatic separation and collection of the sealing ring and waste chips, so as to solve the above problems.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an automatic cutting machine for pipe sealing rings, comprising a separation box, the top of the separation box is open and a separation net is arranged in the upper part thereof, a vibrator is fixedly arranged at the bottom of the separation net, a back plate is vertically fixedly arranged on the top rear end of the separation box, a three-jaw chuck is fixedly mounted on the left end of the front side of the back plate, the clamping jaws of the three-jaw chuck face the right, a distance measuring plate is vertically fixedly arranged on the top of the three-jaw chuck, a top plate is horizontally fixedly arranged on the top of the back plate facing forward, a controller is fixedly arranged on the top of the top plate, and a guide rail is horizontally fixedly arranged on the bottom along the left and right directions, an electric slider is slidably arranged on the guide rail, a support plate is fixedly arranged at the bottom of the electric slider, a first hydraulic cylinder is vertically fixedly arranged on the left end of the bottom of the support plate, and a second hydraulic cylinder is vertically fixedly arranged on the right end, A U-shaped bracket is fixedly sleeved on the cylinder body of the first hydraulic cylinder, the opening of the bracket faces the front side and a third hydraulic cylinder is vertically fixed on the bottom thereof, the piston rods of the first hydraulic cylinder and the third hydraulic cylinder are relatively arranged and can be detachably connected with clamping blocks, semicircular grooves are provided on the opposite sides of the two clamping blocks, the two clamping blocks can abut against each other and are coaxially arranged with the three-jaw chuck, a distance sensor is fixedly provided on the cylinder body of the first hydraulic cylinder corresponding to the ranging plate, the piston rod of the second hydraulic cylinder faces downward and is fixedly connected with an inverted U-shaped tool holder, a rotating shaft is rotatably connected between the lower parts of the two vertical parts of the tool holder, a saw blade is fixedly sleeved on the rotating shaft and one end of the rotating shaft is transmission-connected with a motor, the electric slider, the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder, the motor and the distance sensor are all electrically connected to the controller.
[0005] Preferably, the separation net is arranged at an angle and a discharge port is opened on the side of the separation box corresponding to its lower end. A fourth hydraulic cylinder is vertically fixed on the outer side of the separation box where the discharge port is located. The piston rod of the fourth hydraulic cylinder faces upward and is fixedly connected to a gate plate. The gate plate abuts against the corresponding outer side of the separation box and can block the discharge port.
[0006] Preferably, the bottom of the separation box is in an inverted cone shape and the center of the bottom is connected to a chip removal pipe with a chip removal valve.
[0007] Preferably, the piston rod ends of the first hydraulic cylinder and the third hydraulic cylinder are fixedly connected to a mounting box, the mounting box has an open bottom, a plurality of first fixing through holes are provided on the rear side, and a plurality of fixing blind holes are provided on the front side, an electric push rod is fixedly mounted on the rear outer portion of the mounting box, the telescopic end of the electric push rod faces forward and is fixedly connected to a fixing plate, a plurality of fixing rods are fixedly provided on the front side of the fixing plate, a mounting plate is fixedly provided on the opposite sides of the two clamping blocks, a plurality of second fixing through holes are provided on the mounting plate, the mounting plate is inserted into the corresponding mounting box, the fixing plate abuts against the rear side of the mounting box, the fixing rod corresponds to the first fixing through hole, the second fixing through hole and the fixing blind hole one by one, and the fixing rod passes through the corresponding first fixing through hole and the second fixing through hole and is inserted into the corresponding fixing blind hole.
[0008] Preferably, the mounting plate is compatible with the corresponding mounting box.
[0009] Preferably, the fixing rod is matched with the corresponding first fixing through hole, second fixing through hole and fixing blind hole.
[0010] The beneficial effect of the utility model is that when cutting and processing the sealing ring, one end of the raw material pipe is first clamped and fixed on the three-jaw chuck, and the cutting position of the first sealing ring is marked on the other end of the raw material pipe. Then, the electric slider is operated to drive the support plate to move as a whole, so that the saw blade knife is aligned with the marked cutting position to achieve cutting positioning. Then, the cutting process can be carried out, specifically: the first hydraulic cylinder and the third hydraulic cylinder are first operated, and the piston rods of the two extend, driving the two clamping blocks to move relative to each other until the two clamping blocks are respectively pressed against the upper and lower surfaces of the raw material pipe at the adjacent cutting position, and the pipe is further clamped and fixed. Then, the second hydraulic cylinder and the motor are operated, the piston rod of the second hydraulic cylinder is extended, driving the knife holder to move downward as a whole, and the motor drives the rotating shaft and the saw blade knife thereon to rotate, and the first sealing ring can be cut and processed by mutual cooperation. Then, the piston rods of the first hydraulic cylinder, the third hydraulic cylinder and the second hydraulic cylinder are all contracted, driving the corresponding clamping blocks and the knife holder to reset. After that, the electric slider moves, driving the support plate to move toward the side where the three-jaw chuck is located. During the process, the distance sensor can detect the distance between it and the distance measuring plate in real time, and feed back the distance information to the controller. When the distance is shortened by the width of a sealing ring, the controller can automatically control the electric slider to stop moving, and automatically control the first hydraulic cylinder, the third hydraulic cylinder, the second hydraulic cylinder and the motor to move in sequence, and cut and process the second sealing ring according to the above steps. This cycle will stop when the distance between the distance sensor and the distance measuring plate is lower than the set lower limit, and then the worker will remove the remaining pipe and replace it with another longer raw pipe, and continue the cutting process as mentioned above. In this way, when cutting, one end of the raw pipe and the end adjacent to the cutting position can be clamped and fixed in two positions. The overall clamping is more stable and reliable, which can effectively prevent the pipe from shaking, thereby ensuring the flatness of the cutting surface and improving the cutting quality. In addition to the need for manual measurement and marking of the cutting position of the first sealing ring for the initial positioning of the saw blade, automatic measurement and feeding cutting are fully realized in the subsequent process, which is more accurate, saves time and effort, and can further improve the efficiency and quality of cutting.
[0011] In addition, the waste chips generated during cutting and the cut sealing rings can fall onto the separation net under the top plate together. Under the vibration separation effect formed by the vibrator and the separation net, the waste chips can fall through the separation net and gather in the lower part of the separation box, while the sealing rings are blocked and separated on the upper surface of the separation net, thereby realizing automatic separation and collection of waste chips and sealing rings, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a main structural schematic diagram of the utility model;
[0013] Figure 2 It is a schematic diagram of the main structure of the first hydraulic cylinder and the third hydraulic cylinder of the utility model;
[0014] Figure 3 It is a left-side structural schematic diagram of the first hydraulic cylinder and the third hydraulic cylinder of the utility model;
[0015] Figure 4 This is a schematic diagram of the main structure of the installation box of the utility model;
[0016] Figure 5 It is a left-side structural schematic diagram of the installation box of the utility model;
[0017] Figure 6 It is a schematic diagram of the main structure of the mounting plate of the utility model;
[0018] Figure 7 It is a left-side structural schematic diagram of the mounting plate of the utility model;
[0019] Figure 8 It is a left-side structural schematic diagram of the utility model when the mounting plate is connected to the mounting box.
[0020] Numbers in the figure: 1 is a separation box, 2 is a separation net, 3 is a vibrator, 4 is a back plate, 5 is a three-jaw chuck, 6 is a distance measuring plate, 7 is a top plate, 8 is a controller, 9 is a guide rail, 10 is an electric slider, 11 is a support plate, 12 is a first hydraulic cylinder, 13 is a second hydraulic cylinder, 14 is a bracket, 15 is a third hydraulic cylinder, 16 is a clamping block, 17 is a card slot, 18 is a distance sensor, 19 is a tool holder, 20 is a rotating shaft, 21 is a saw blade, 22 is a motor, 23 is a discharge port, 24 is a fourth hydraulic cylinder, 25 is a gate, 26 is a chip discharge valve, 27 is a chip discharge pipe, 28 is a mounting box, 29 is a first fixed through hole, 30 is a fixed blind hole, 31 is an electric push rod, 32 is a fixed plate, 33 is a fixed rod, 34 is a mounting plate, and 35 is a second fixed through hole. DETAILED DESCRIPTION
[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:
[0022] like Figures 1 to 8As shown, an automatic cutting machine for pipe sealing rings comprises a separation box 1, the top of which is open and a separation net 2 is provided in the upper part thereof, a vibrator 3 is fixedly provided at the bottom of the separation net 2, and a back plate 4 is vertically fixedly provided on the top rear end of the separation box 1. A three-jaw chuck 5 is fixedly provided on the left end of the front side of the back plate 4, the clamping jaws of the three-jaw chuck 5 face the right, and a distance measuring plate 6 is vertically fixedly provided on the top of the three-jaw chuck 5. A top plate 7 is horizontally fixedly provided on the top of the back plate 4 facing forward, a controller 8 is fixedly provided on the top of the top plate 7, and a guide rail 9 is horizontally fixedly provided on the bottom along the left and right directions, an electric slider 10 is slidably provided on the guide rail 9, a support plate 11 is fixedly provided at the bottom of the electric slider 10, a first hydraulic cylinder 12 is vertically fixedly provided on the left end of the bottom of the support plate 11, and a second hydraulic cylinder 13 is vertically fixedly provided on the right end. A U-shaped bracket 14 is fixedly sleeved on the cylinder body of the first hydraulic cylinder 12. The opening of the bracket 14 faces the front side and a third hydraulic cylinder 15 is vertically fixed on the bottom thereof. The piston rods of the first hydraulic cylinder 12 and the third hydraulic cylinder 15 are arranged opposite to each other and are both detachably connected with a clamping block 16. Semicircular clamping grooves 17 are provided on the opposite sides of the two clamping blocks 16. The two clamping blocks 16 can be relatively abutted and coaxially arranged with the three-jaw chuck 5. A distance sensor 18 is fixedly arranged on the cylinder body of the first hydraulic cylinder 12 corresponding to the distance measuring plate 6. The piston rod of the second hydraulic cylinder 13 faces downward and is fixedly connected with an inverted U-shaped tool holder 19. A rotating shaft 20 is rotatably connected between the lower parts of the two vertical parts of the tool holder 19. A saw blade 21 is fixedly sleeved on the rotating shaft 20 and a motor 22 is transmission-connected to one end of the rotating shaft 20. The electric slider 10, the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 15, the motor 22 and the distance sensor 18 are all electrically connected to the controller 8;
[0023] When cutting and processing the sealing ring, first clamp and fix one end of the raw pipe on the three-jaw chuck 5, and mark the cutting position of the first sealing ring on the other end of the raw pipe. Then, operate the electric slider 10 to drive the support plate 11 to move as a whole, align the saw blade 21 with the marked cutting position, and achieve cutting positioning. Then, the cutting operation can be carried out, specifically: the first hydraulic cylinder 12 and the third hydraulic cylinder 15 are activated first, and the piston rods of the two extend, driving the two clamping blocks 16 to move relative to each other, until the two clamping blocks 16 are respectively pressed against the upper and lower surfaces of the raw pipe at the adjacent cutting position, further clamping and fixing the pipe. Then, the second hydraulic cylinder 13 and the motor 22 are activated, and the piston rod of the second hydraulic cylinder 13 extends, driving the knife holder 19 to move downward as a whole, and the motor 22 drives the rotating shaft 20 and the saw blade 21 thereon to rotate, and with mutual cooperation, the first sealing ring can be cut and processed. Then, the piston rods of the first hydraulic cylinder 12, the third hydraulic cylinder 15, and the second hydraulic cylinder 13 are all retracted, driving the corresponding clamping block 16 and the tool holder 19 to reset. After that, the electric slider 10 moves, driving the support plate 11 to move toward the side where the three-jaw chuck 5 is located. During the process, the distance sensor 18 can detect the distance between it and the distance measuring plate 6 in real time, and feed back the distance information to the controller 8. When the distance is shortened by the width of a sealing ring, the controller 8 can automatically control the electric slider 10 to stop moving, and automatically control the first hydraulic cylinder 12, the third hydraulic cylinder 15, the second hydraulic cylinder 13 and the motor 22 to move successively, and cut and process the second sealing ring according to the above steps. This cycle is repeated until the distance between the distance sensor 18 and the distance measuring plate 6 is lower than the set lower limit value, and then the worker removes the remaining pipes and replaces them with another longer raw pipe, and continues the cutting process as described above. In this way, during cutting, one end of the raw pipe and the end adjacent to the cutting position can be clamped and fixed in two positions, and the overall clamping is more stable and reliable, which can effectively prevent the pipe from shaking, thereby ensuring the flatness of the cutting surface and improving the cutting quality. In addition to the need for manual measurement and marking of the cutting position of the first sealing ring for initial positioning of the saw blade 21, automatic measurement and feeding cutting are fully realized in the subsequent process, which is more accurate, saves time and effort, and can further improve the efficiency and quality of cutting.
[0024] In addition, the waste generated during cutting and the cut sealing ring can fall together onto the separation net 2 below the top plate 7. Under the vibration separation effect formed by the cooperation of the vibrator 3 and the separation net 2, the waste can fall through the separation net 2 and collect in the lower part of the separation box 1, while the sealing ring is blocked and separated on the upper surface of the separation net 2, thereby realizing the automatic separation and collection of waste and sealing rings, which is more practical. The three-jaw chuck 4, the controller 8, the electric slider 10, the first hydraulic cylinder 12, the second hydraulic cylinder 13, the third hydraulic cylinder 15, the distance sensor 18, the saw blade 21, and the motor 22 can all adopt the existing technology, and their specific structure and working principle are all the existing technology, which will not be described in detail here.
[0025] In this embodiment, the separation net 2 is arranged at an angle and a discharge port 23 is opened on the side of the separation box 1 corresponding to its lower end. A fourth hydraulic cylinder 24 is vertically fixed on the outer side of the separation box 1 where the discharge port 23 is located. The piston rod of the fourth hydraulic cylinder 24 faces upward and is fixedly connected to a gate plate 25. The gate plate 25 abuts against the corresponding outer side of the separation box 1 and can block the discharge port 23, so that during actual cutting processing, the separated sealing rings can be automatically gathered to the lower end of the separation net 2 under the action of the inclined separation net 2. After accumulating to a certain number, the fourth hydraulic cylinder 24 can be operated to shrink its piston rod, drive the gate plate 25 to move downward, and stagger the gate plate 25 with the discharge port 23, so that the sealing rings can be discharged through the discharge port 23, which is more convenient for discharging and collecting the sealing rings.
[0026] In this embodiment, the bottom of the separation box 1 is in an inverted cone shape and the center of the bottom is connected to a chip discharge pipe 27 with a chip discharge valve 26, which is more convenient for collecting and discharging the separated waste chips.
[0027] In this embodiment, the piston rod ends of the first hydraulic cylinder 12 and the third hydraulic cylinder 15 are fixedly connected to a mounting box 28, the bottom of the mounting box 28 is open, a plurality of first fixed through holes 29 are opened on the rear side, and a plurality of fixed blind holes 30 are opened on the front side. An electric push rod 31 is fixedly mounted on the rear outer portion of the mounting box 28, the telescopic end of the electric push rod 31 faces forward and is fixedly connected to a fixing plate 32, and a plurality of fixing rods 33 are fixedly arranged on the front side of the fixing plate 32. A mounting plate 34 is fixed on the opposite side of the two clamping blocks 16, and a plurality of second fixing through holes 35 are opened on the mounting plate 34. The mounting plate 34 is inserted into the corresponding mounting box 28, and the fixing plate 32 abuts against the rear side of the mounting box 28. The fixing rod 33 corresponds to the first fixing through hole 29, the second fixing through hole 35 and the fixing blind hole 30 one by one, and the fixing rod passes through the corresponding first fixing through hole 29 and the second fixing through hole 35 and is inserted into the corresponding fixing blind hole 30, so that in actual use, the two clamping blocks 16 can be flexibly adjusted. Convenient disassembly and replacement can ensure that the clamping block 16 can flexibly adapt to the clamping of raw pipes of different pipe diameters, cooperate with the three-jaw chuck 5, better meet the actual processing needs, have a wide range of applications, and are more flexible and convenient to use. The specific replacement operation is: first operate the electric push rod 31 to shrink its telescopic end, drive the fixed plate 32 to retreat, until the fixed rod 33 withdraws from the corresponding installation box 28, the plug-in fixation of the installation plate 34 can be released, and then the installation plate 34 is pulled out of the installation box 28, and the original clamping block 16 can be removed. Next, after taking out the new clamping block 16, first align the mounting plate 34 on it with the corresponding mounting box 28 and plug it into place, then operate the electric push rod 31 to extend its telescopic end, driving the fixing plate 32 to move toward the mounting box until the fixing plate 32 is pressed against the rear side of the mounting box 28, and the fixing rod 33 can successively penetrate the corresponding first fixing through hole 29 and the second fixing through hole 35 and be plugged into the corresponding fixing blind hole 30, so that the mounting plate 34 can be plugged and fixed, thereby achieving fixed installation of the clamping block 16, and the installation is firm and does not affect subsequent use.
[0028] In this embodiment, the mounting plate 34 is matched with the corresponding mounting box 28 to ensure that the mounting plate 34 is smoothly plugged and installed in place.
[0029] In this embodiment, the fixing rod 33 is matched with the corresponding first fixing through hole 29 , the second fixing through hole 35 and the fixing blind hole 30 to ensure that the fixing rod 33 can be smoothly plugged into place to cooperate with the installation plate 34 to achieve plug-in fixation.
[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An automatic pipe sealing ring cutting machine, characterized in that: The invention comprises a separation box, wherein the top of the separation box is open and a separation net is arranged inside the upper part thereof, a vibrator is fixedly arranged at the bottom of the separation net, a back plate is vertically fixedly arranged on the top rear end of the separation box, a three-jaw chuck is fixedly mounted on the left end of the front side of the back plate, the clamping jaws of the three-jaw chuck face the right, a distance measuring plate is vertically fixedly arranged on the top of the three-jaw chuck, a top plate is horizontally fixedly arranged on the top of the back plate facing forward, a controller is fixedly arranged on the top of the top plate, a guide rail is horizontally fixedly arranged on the bottom along the left and right directions, an electric slider is slidably arranged on the guide rail, a support plate is fixedly arranged on the bottom of the electric slider, a first hydraulic cylinder is vertically fixedly arranged on the left end of the bottom of the support plate, and a second hydraulic cylinder is vertically fixedly arranged on the right end, and a U-shaped bracket is fixedly arranged on the cylinder body of the first hydraulic cylinder The opening of the bracket faces the front side and a third hydraulic cylinder is vertically fixed on the bottom of the bracket. The piston rods of the first hydraulic cylinder and the third hydraulic cylinder are relatively arranged and can be detachably connected with clamping blocks. Semicircular grooves are provided on the opposite sides of the two clamping blocks. The two clamping blocks can abut against each other and are coaxially arranged with the three-jaw chuck. A distance sensor is fixed on the cylinder body of the first hydraulic cylinder corresponding to the ranging plate. The piston rod of the second hydraulic cylinder faces downward and is fixedly connected with an inverted U-shaped tool holder. A rotating shaft is rotatably connected between the lower parts of the two vertical parts of the tool holder. A saw blade is fixedly sleeved on the rotating shaft and one end of the rotating shaft is transmission-connected with a motor. The electric slider, the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder, the motor and the distance sensor are all electrically connected to the controller.
2. The automatic pipe sealing ring cutting machine according to claim 1, characterized in that: The separation net is arranged obliquely and a discharge port is opened on the side of the separation box corresponding to its lower end. A fourth hydraulic cylinder is vertically fixed on the outer side of the separation box where the discharge port is located. The piston rod of the fourth hydraulic cylinder faces upward and is fixedly connected with a gate plate. The gate plate abuts against the corresponding outer side of the separation box and can block the discharge port.
3. The automatic pipe sealing ring cutting machine according to claim 1, characterized in that: The bottom of the separation box is in an inverted cone shape, and the center of the bottom is connected to a chip removal pipe with a chip removal valve.
4. The automatic pipe sealing ring cutting machine according to claim 1, characterized in that: The piston rod ends of the first hydraulic cylinder and the third hydraulic cylinder are fixedly connected to a mounting box, the bottom of the mounting box is open, a plurality of first fixing through holes are opened on the rear side, and a plurality of fixing blind holes are opened on the front side, an electric push rod is fixedly mounted on the rear outer part of the mounting box, the telescopic end of the electric push rod faces forward and is fixedly connected to a fixing plate, a plurality of fixing rods are fixedly arranged on the front side of the fixing plate, a mounting plate is fixedly arranged on the opposite sides of the two clamping blocks, a plurality of second fixing through holes are opened on the mounting plate, the mounting plate is inserted into the corresponding mounting box, the fixing plate abuts against the rear side of the mounting box, the fixing rod corresponds to the first fixing through hole, the second fixing through hole and the fixing blind hole one by one, and the fixing rod passes through the corresponding first fixing through hole and the second fixing through hole and is inserted into the corresponding fixing blind hole.
5. The automatic pipe sealing ring cutting machine according to claim 4, characterized in that: The mounting plate is matched with the corresponding mounting box.
6. The automatic pipe sealing ring cutting machine according to claim 4, characterized in that: The fixing rod is matched with the corresponding first fixing through hole, the second fixing through hole and the fixing blind hole.