Oil way leak detection device of ship crankshaft inner cavity

Abstract

The invention discloses an oil way leakage detection device for a ship crankshaft inner cavity, and relates to the technical field of oil way leakage detection equipment. The invention provides an oil way leak hunting device for a ship crankshaft inner cavity, which comprises a bottom frame and the like, the bottom frame is slidably connected with a sliding support, the bottom frame is fixedly connected with an electric push rod, the telescopic end of the electric push rod is fixedly connected with the sliding support, the bottom frame is rotatably connected with a booster jar, the booster jar is in threaded connection with a booster frame, and the bottom frame is fixedly connected with a motor. The output end of the motor is fixedly connected with a gear, the sliding support is rotationally connected with a blocking block, a connecting mechanism is arranged on the blocking block, and the blocking block is rotationally connected with a pressure gauge through the connecting mechanism. Through parts such as the booster tank and the plugging block, the crankshaft can be driven to rotate so as to simulate the actual working condition of the crankshaft and perform leak detection on the crankshaft, so that the reliability of a test result is improved, and the situation that the crankshaft rotates relative to the booster tank and the plugging block and leaks to affect the test result can be avoided; and the accuracy and the reliability of the detection result of the oil way leak detection device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil circuit leakage detection equipment, in particular to an oil circuit leakage detection device for an inner cavity of a ship crankshaft. Background Art

[0002] The crankshaft is one of the most important rotating parts in the engine. Its main function is to convert the reciprocating motion of the piston into rotational motion, thereby driving the power system of the vehicle or ship. There is an oil circuit in the inner cavity of the crankshaft, which is mainly used to lubricate and cool the crankshaft and its related components, and the lubricating oil can be efficiently transported to various key parts through the oil circuit to ensure the normal operation of the engine. In order to ensure the sealing and integrity of the oil circuit, prevent lubricating oil leakage, and ensure the normal operation and reliability of the engine, workers usually perform leak detection on the oil circuit in the inner cavity of the ship's crankshaft. Effective leak detection can detect potential problems in time and avoid mechanical wear and failure caused by insufficient lubrication, thereby ensuring the safe navigation of the ship and extending the service life of the engine.

[0003] When leak testing the oil circuit in the inner cavity of a ship's crankshaft, a fixed pressure test is usually used to ensure the sealing performance. In order to more realistically simulate the actual working conditions, a rotation test is introduced in some cases. However, the rotation test increases the complexity and uncertainty of the test. For example, the seals at the connection parts (such as flanges, joints, etc.) are prone to failure under mechanical movement and friction, resulting in gas or liquid leakage, which affects the leak test results. In addition, the dynamic stress and multivariate interference caused by the rotation will further affect the accuracy and reliability of the test results, making potential leaks more difficult to identify and detect.

[0004] Based on the above situation, the present invention proposes an oil leakage detection device for the inner cavity of a ship crankshaft with high detection accuracy. Summary of the invention

[0005] In order to overcome the shortcomings of existing rotary leak detection devices, that is, the seals at the connection parts are easily failed due to mechanical movement and friction, resulting in gas or liquid leakage, thereby affecting the leak detection result, and the dynamic stress and multivariate interference caused by rotation will further affect the accuracy and reliability of the test results, making potential leakage points more difficult to identify and detect, the present invention provides an oil circuit leak detection device for the inner cavity of a ship crankshaft with high detection accuracy.

[0006] A device for detecting oil leakage in the inner cavity of a ship crankshaft comprises a base frame, a sliding bracket, an electric push rod, a boosting tank, a boosting frame, a gear, a motor, a block, a pressure gauge and a connecting mechanism, wherein the base frame is slidably connected to the sliding bracket, the base frame is fixedly connected to the electric push rod, the telescopic end of the electric push rod is fixedly connected to the sliding bracket, the base frame is rotatably connected to the boosting tank, the boosting tank is threadedly connected to the boosting frame, a gear ring is fixedly connected to the outside of the boosting tank, the base frame is fixedly connected to the motor, the output end of the motor is fixedly connected to the gear, the gear is rotatably connected to the base frame, the gear is meshed with the gear ring outside the boosting tank, the sliding bracket is rotatably connected to the block, a connecting mechanism is provided on the block, the block is rotatably connected to the pressure gauge via the connecting mechanism, and the boosting tank and the block are used for clamping and fixing the crankshaft.

[0007] Furthermore, the connecting mechanism includes a screw sleeve, a sealing gasket and an arc-shaped limit rod. The screw sleeve is threadedly connected to the blocking block, the screw sleeve is rotatably connected to the pressure gauge, the blocking block is fixed with a sealing gasket, the pressure gauge is also fixed with a sealing gasket, the sealing gasket on the blocking block contacts and cooperates with the sealing gasket on the pressure gauge, the sliding bracket is fixed with an arc-shaped limit rod, and the arc-shaped limit rod is slidably connected to the pressure gauge.

[0008] Furthermore, the boost tank and the blocking block are both fixedly connected with sealing members.

[0009] Furthermore, it also includes a docking mechanism, which is arranged on the sliding bracket, and the docking mechanism includes a guide frame, a rotating wheel frame, a tension spring, a roller frame and an arc-shaped roller. The guide frame is slidably connected to the sliding bracket, and a pair of tension springs are fixed between the guide frame and the sliding bracket. The sliding bracket is slidably connected to a pair of rotating wheel frames, the rotating wheel frames are in contact and fit with the crankshaft, the rotating wheel frame is slidably connected to the guide frame, the sliding bracket is slidably connected to the roller frame, the roller frame is in contact and fit with the crankshaft, the roller frame is slidably connected to the guide frame, the guide frame is rotatably connected to a pair of arc-shaped rollers, and the crankshaft and the arc-shaped rollers are extrusion-fitted.

[0010] Furthermore, the guide frame and the rotating wheel frame are both provided with a V-shaped sliding groove.

[0011] Furthermore, it also includes a clamping mechanism, which is arranged on the supercharging tank. The clamping mechanism includes a clamping frame and a nut. The clamping frame is fixed to the supercharging tank, the clamping frame is in contact with the crankshaft, the clamping frame is threadedly connected with the nut, and the nut is extruded and fitted with the crankshaft.

[0012] Furthermore, it also includes a supporting mechanism, which is arranged on the base frame. The supporting mechanism includes a bracket and a guide plate. The bracket is slidably connected to the base frame, the bracket is in contact with the crankshaft, the sliding bracket is fixed with the guide plate, and the guide plate is slidably connected to the bracket.

[0013] Furthermore, the guide plate is also provided with a V-shaped sliding groove.

[0014] The beneficial effects are as follows: 1. The present invention can drive the crankshaft to rotate through components such as the boost tank and the block to simulate the actual working condition of the crankshaft and perform leak detection on it, thereby improving the reliability of the test results, and can also avoid relative rotation and leakage between the crankshaft and the boost tank and the block, thereby affecting the test results, thereby improving the accuracy and reliability of the detection results of this oil circuit leak detection device.

[0015] 2. The present invention uses components such as sealing gaskets and arc-shaped limit rods to prevent the pressure gauge from rotating with components such as blocks, thereby affecting workers' readings of the pressure gauge and improving users' experience; it can also ensure that no leakage occurs when the pressure gauge and components such as blocks rotate relative to each other, thereby improving the sealing of the oil circuit leakage detection device.

[0016] 3. The present invention uses components such as a guide frame and a rotating wheel frame to guide the crankshaft when installing it, thereby reducing the difficulty of crankshaft installation and improving the user experience. It can also support the right side of the crankshaft without affecting the rotation of the crankshaft during subsequent testing, thereby preventing the seal on the block from being deformed due to excessive pressure and affecting the sealing of the connection between the block and the crankshaft, thereby improving the test accuracy of the oil circuit leak detection device.

[0017] 4. The present invention can strengthen the connectivity between the boost tank and the crankshaft through components such as the bracket and the nut, thereby ensuring that the boost tank and other components can drive the crankshaft to rotate, and can also support the crankshaft to disperse the force on the boost tank, thereby preventing the seal on the boost tank from being deformed due to excessive pressure and affecting the sealing of the connection between the boost tank and the crankshaft, thereby improving the test accuracy of the oil circuit leak detection device.

[0018] 5. The present invention can support the left end of the crankshaft when installing the crankshaft through components such as the bracket and the guide plate, and will not affect the rotation of the crankshaft during subsequent testing, thereby reducing the difficulty of installing the crankshaft and improving the user experience, thereby improving the practicality of the oil circuit leak detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the base frame, sliding bracket, electric push rod and other components of the present invention.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of components such as the electric push rod, the booster tank and the booster frame of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the sliding bracket, the blocking block and the pressure gauge of the present invention.

[0023] Figure 5It is a three-dimensional structural schematic diagram of the guide frame, rotating wheel frame, tension spring and other components of the present invention.

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the rotating wheel frame, tension spring, roller frame and other components of the present invention.

[0025] Figure 7 It is a three-dimensional structural schematic diagram of components such as the thread sleeve, the sealing gasket and the arc-shaped limiting rod of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the pressure gauge, screw sleeve and sealing gasket of the present invention.

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the booster tank, the bracket and the nut of the present invention.

[0028] Fig.10 It is a three-dimensional structural schematic diagram of the sliding bracket, bracket, guide plate and other components of the present invention.

[0029] Fig.11 It is a schematic diagram of the three-dimensional structure of the bracket and the guide plate of the present invention.

[0030] The names and serial numbers of the parts in the figure are: 1_base frame, 101_crankshaft, 2_sliding bracket, 3_electric push rod, 4_boost tank, 5_boost frame, 6_gear, 7_motor, 8_block, 9_pressure gauge, 10_guide frame, 11_rotating wheel frame, 12_tension spring, 13_roller frame, 14_arc roller, 15_screw sleeve, 16_sealing gasket, 17_arc limit rod, 18_cage, 19_nut, 20_bracket, 21_guide plate. DETAILED DESCRIPTION

[0031] The preferred technical solutions of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] A device for detecting oil leakage in the inner cavity of a ship crankshaft, such as Figure 1-Figure 8As shown, it includes a base frame 1, a sliding bracket 2, an electric push rod 3, a boost tank 4, a boost frame 5, a gear 6, a motor 7, a block 8, a pressure gauge 9 and a connecting mechanism. The right side of the base frame 1 is slidably connected to the sliding bracket 2, the electric push rod 3 is fixedly connected to the upper right side of the base frame 1, the telescopic end of the electric push rod 3 is fixedly connected to the sliding bracket 2, the top of the base frame 1 is rotatably connected to the boost tank 4, the left side of the boost tank 4 is threadedly connected to the boost frame 5, the outside of the boost tank 4 is fixedly connected to a gear ring, the inside of the base frame 1 is fixedly connected to the motor 7, the output end of the motor 7 is fixedly connected to the gear 6, the gear 6 is rotatably connected to the base frame 1, the gear 6 is meshed with the gear ring outside the boost tank 4, the top right side of the sliding bracket 2 is rotatably connected to the block 8, the block 8 is provided with a connecting mechanism, the right side of the block 8 is rotatably connected to the pressure gauge 9 through the connecting mechanism, and the boost tank 4 and the block 8 are used to clamp and fix the crankshaft 101.

[0034] like Figure 7 and Figure 8 As shown, the connecting mechanism includes a screw sleeve 15, a sealing gasket 16 and an arc-shaped limiting rod 17. The screw sleeve 15 is threadedly connected to the right side of the block 8, and the screw sleeve 15 is rotatably connected to the pressure gauge 9. A sealing gasket 16 is fixed to the right side of the inside of the block 8, and a sealing gasket 16 is also fixed to the lower left side of the pressure gauge 9. The sealing gasket 16 on the block 8 is in contact with the sealing gasket 16 on the pressure gauge 9. An arc-shaped limiting rod 17 is fixed to the upper right side of the sliding bracket 2, and the arc-shaped limiting rod 17 is slidably connected to the pressure gauge 9.

[0035] like Figure 2-Figure 4 As shown, a sealing member is fixedly connected to one side of the boost tank 4 and the blocking block 8 that are close to each other.

[0036] When workers need to test the oil circuit inside the crankshaft 101 of a ship for leaks, they can first transport the crankshaft 101 to between the boost tank 4 and the block 8 through external lifting equipment, and then start the electric push rod 3, which will drive the sliding bracket 2, the block 8, the pressure gauge 9 and other components to move to the left until the boost tank 4 and the block 8 clamp and fix the crankshaft 101, so that the crankshaft 101 can be installed between the boost tank 4 and the block 8, wherein the seals on the boost tank 4 and the block 8 can ensure the sealing of the connection between them and the crankshaft 101, and then the workers can move forward as needed. The supercharging frame 5 is rotated to make it move rightward while rotating, thereby compressing the air in the supercharging tank 4, the crankshaft 101 and the block 8 and increasing the air pressure. After adjusting the air pressure, the motor 7 can be started, and the motor 7 will drive the gear 6 to rotate. The rotation of the gear 6 will drive the supercharging tank 4, the crankshaft 101, the block 8 and other components to rotate through the ring gear. During this period, the reading of the pressure gauge 9 can be observed to determine whether there is a leak in the oil circuit of the crankshaft 101. In this way, the actual working condition of the crankshaft 101 can be simulated and leak detection can be performed under different air pressure conditions, thereby improving the reliability of the test result, and by Since the boost tank 4 and the block 8 rotate synchronously with the crankshaft 101, there is no risk of leakage at the connection between the boost tank 4, the block 8 and the crankshaft 101 due to relative rotation, thereby improving the accuracy of the test results. In order to facilitate workers to take real-time readings during the test, the pressure gauge 9 does not rotate with the block 8, but remains in a vertical state under the action of the arc-shaped limit rod 17. At this time, although the pressure gauge 9 rotates relatively with the block 8, the pressure gauge 9 and the block 8 are fixedly connected with a sealing gasket 16 at the connection between the two, and the cross-sectional area of ​​this section of the air passage is relatively large. The pressure gauge 9 and the sealing gasket 16 on the block 8 are worn, and the worker can also remove the pressure gauge 9 and replace the sealing gasket 16 by twisting the screw sleeve 15, so as to ensure the sealing of the connection between the block 8 and the pressure gauge 9, thereby improving the accuracy of the test result. After the test is completed, the motor 7 is turned off and the booster frame 5 is rotated in the reverse direction to move the booster frame 5 to the left and reset, and then the sliding bracket 2, the block 8 and the pressure gauge 9 and other components are driven by the electric push rod 3 to move to the right and reset, and the crankshaft 101 is removed by external lifting equipment.

[0037] Example 2

[0038] On the basis of Example 1, Figure 5 and Figure 6As shown, it also includes a docking mechanism, which is arranged on the sliding bracket 2. The docking mechanism includes a guide frame 10, a rotating wheel frame 11, a tension spring 12, a roller frame 13 and an arcuate roller 14. The guide frame 10 is slidably connected to the right side of the sliding bracket 2. Two front and rear tension springs 12 are fixedly connected between the guide frame 10 and the sliding bracket 2. The sliding bracket 2 is slidably connected to the rotating wheel frame 11 which is symmetrically distributed front and back. The rotating wheel frame 11 is in contact with the crankshaft 101. The rotating wheel frame 11 is slidably connected to the guide frame 10. The upper part of the sliding bracket 2 is slidably connected to the roller frame 13. The roller frame 13 is in contact with the crankshaft 101. The roller frame 13 is slidably connected to the guide frame 10. The left side of the guide frame 10 is rotatably connected to the arcuate roller 14 which is symmetrically distributed front and back. The crankshaft 101 is extruded and fitted with the arcuate roller 14.

[0039] like Figure 5 and Figure 6 As shown, the lower part of the guide frame 10 and the middle part of the rotating wheel frame 11 are both provided with a V-shaped sliding groove.

[0040] like Fig. 9 As shown, a clamping mechanism is also included, which is arranged on the boost tank 4. The clamping mechanism includes a clamping frame 18 and a nut 19. The clamping frame 18 is fixedly connected to the right side of the boost tank 4, and the clamping frame 18 is in contact with the crankshaft 101. The upper part of the clamping frame 18 is threadedly connected with a nut 19, and the nut 19 is squeezed and fitted with the crankshaft 101.

[0041] like Fig.10 and Fig.11 As shown, it also includes a supporting mechanism, which is arranged on the base frame 1. The supporting mechanism includes a bracket 20 and a guide plate 21. The bracket 20 is slidably connected to the upper right side of the base frame 1, and the bracket 20 is in contact with the crankshaft 101. The guide plate 21 is fixedly connected to the top left side of the sliding bracket 2, and the guide plate 21 is slidably connected to the bracket 20.

[0042] like Fig.10 and Fig.11 As shown, a V-shaped sliding groove is also provided in the middle of the guide plate 21.

[0043] When the worker needs to install the crankshaft 101 between the boost tank 4 and the block 8, the crankshaft 101 can be placed on the roller frame 13 and the bracket 20 through the external lifting equipment, and then the crankshaft 101 is moved to the left and docked with the boost tank 4. At this time, the bracket 18 will contact and limit the crankshaft 101. Next, the nut 19 can be rotated forward to move the nut 19 downward and against the crankshaft 101. In this way, the crankshaft 101 can be fixed on the bracket 18, thereby enhancing the connectivity between the boost tank 4 and the crankshaft 101 and ensuring that the boost tank 4 and other components can drive the crankshaft 101 to rotate. After that, the electric push rod 3 is used to drive the sliding bracket 2, the block 8, the pressure gauge 9 and other components to move to the left, and the roller on the roller frame 13 starts to rotate. When the crankshaft 101 and the block 8 are connected, the guide frame 10 and the roller frame 13 are moved to the left, and the guide frame 10 and the roller frame 13 are moved to the right, and the guide frame 10 moves to the right relative to the sliding bracket 2, and the rotation spring 12 is stretched, and the guide frame 10 moves to the right relative to the sliding bracket 2, and the rotation frame 11 and the roller frame 13 continue to move to the left with the sliding bracket 2. When the crankshaft 101 is connected to the block 8, the guide frame 10 moves the roller frame 13 downward through the factory-shaped slide groove and separates from the crankshaft 101. , and make the front and rear two rotating wheel frames 11 move towards each other and contact with the crankshaft 101. At this time, the right end of the crankshaft 101 is supported by the front and rear rotating wheel frames 11, and as the sliding bracket 2 drives the guide plate 21 to move to the left, the guide plate 21 will also move the bracket 20 downward and separate from the crankshaft 101 through the factory-shaped slide groove, so as to avoid the roller frame 13 and the bracket 20 from hindering the rotation of the crankshaft 101 during the subsequent test process. In this way, the crankshaft 101 during the installation process can be supported and guided by the bracket 20 and the roller frame 13, thereby reducing the difficulty of installing the crankshaft 101. During the test process, the crankshaft 101 is supported by the bracket 18 and the rotating wheel frame 11 to disperse the force on the supercharging tank 4 and the block 8, so as to avoid the supercharging tank 4 and The seal on the block 8 is deformed due to the excessive pressure and affects the sealing of the connection between it and the crankshaft 101. In the subsequent rotation of the crankshaft 101, the arc roller 14 and the wheel on the rotating wheel frame 11 will rotate accordingly to reduce the friction between the crankshaft 101 and the supporting components. After the test is completed, the nut 19 needs to be rotated in the opposite direction first, and then the electric push rod 3 is used to drive the sliding bracket 2 and the block 8 and other components to move to the right and reset. During this period, the guide frame 10 and the arc roller 14 will move to the left relative to the sliding bracket 2 under the action of the tension spring 12 to reset, thereby driving the roller frame 13 to move upward and reset, and the front and rear rotating wheel frames 11 move back to reset, and the guide plate 21 will also cause the bracket 20 to move upward and reset as the sliding bracket 2 moves to the left and reset.Finally, the crankshaft 101 can be removed by external lifting equipment.

[0044] It should be understood that the above description is only for exemplary purposes and is not meant to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will be included within the scope of the claims herein.

Claims

1. An oil leakage detection device for the inner cavity of a ship crankshaft, characterized in that: The invention comprises a base frame (1), a sliding bracket (2), an electric push rod (3), a booster tank (4), a booster frame (5), a gear (6), a motor (7), a block (8), a pressure gauge (9) and a connecting mechanism. The base frame (1) is slidably connected to the sliding bracket (2). The base frame (1) is fixedly connected to the electric push rod (3). The telescopic end of the electric push rod (3) is fixedly connected to the sliding bracket (2). The base frame (1) is rotatably connected to the booster tank (4). The booster tank (4) is threadedly connected to the booster frame (5). A gear ring is fixedly connected to the outside of the boost tank (4), a motor (7) is fixedly connected to the base frame (1), a gear (6) is fixedly connected to the output end of the motor (7), the gear (6) is rotatably connected to the base frame (1), the gear (6) is meshed with the gear ring outside the boost tank (4), the sliding bracket (2) is rotatably connected to a block (8), a connecting mechanism is provided on the block (8), the block (8) is rotatably connected to a pressure gauge (9) through the connecting mechanism, and the boost tank (4) and the block (8) are used to clamp and fix the crankshaft (101).

2. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 1 is characterized by: Where to connect The mechanism comprises a screw sleeve (15), a sealing gasket (16) and an arc-shaped limiting rod (17); the screw sleeve (15) is threadedly connected to the block (8); the screw sleeve (15) is rotatably connected to the pressure gauge (9); the block (8) is fixedly connected with the sealing gasket (16); the pressure gauge (9) is also fixedly connected with the sealing gasket (16); the sealing gasket (16) on the block (8) is in contact with the sealing gasket (16) on the pressure gauge (9); the sliding bracket (2) is fixedly connected with the arc-shaped limiting rod (17); and the arc-shaped limiting rod (17) is slidably connected to the pressure gauge (9).

3. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 2 is characterized by: Among them, supercharging The tank (4) and the block (8) are both fixedly connected with sealing members.

4. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 3 is characterized by: The invention also comprises a docking mechanism, which is arranged on the sliding bracket (2), and comprises a guide frame (10), a rotating wheel frame (11), a tension spring (12), a roller frame (13) and an arc roller (14); the guide frame (10) is slidably connected to the sliding bracket (2); a pair of tension springs (12) are fixedly connected between the guide frame (10) and the sliding bracket (2); the sliding bracket (2) is slidably connected to the pair of rotating wheel frames (11); The rotating wheel frame (11) is in contact with the crankshaft (101), the rotating wheel frame (11) is slidably connected to the guide frame (10), the sliding bracket (2) is slidably connected to the roller frame (13), the roller frame (13) is in contact with the crankshaft (101), the roller frame (13) is slidably connected to the guide frame (10), the guide frame (10) is rotatably connected to a pair of arc rollers (14), and the crankshaft (101) and the arc rollers (14) are extrusion-matched.

5. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 4 is characterized by: The leading position The frame (10) and the rotating wheel frame (11) are both provided with a shaped sliding groove.

6. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 5 is characterized by: The invention also comprises a clamping mechanism, which is arranged on the supercharging tank (4), and comprises a clamping frame (18) and a nut (19). The clamping frame (18) is fixedly connected to the supercharging tank (4), the clamping frame (18) is in contact with the crankshaft (101), the clamping frame (18) is threadedly connected with the nut (19), and the nut (19) is pressed and matched with the crankshaft (101).

7. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 6 is characterized by: The invention also comprises a support mechanism, which is arranged on the base frame (1), and comprises a bracket (20) and a guide plate (21). The bracket (20) is slidably connected to the base frame (1), the bracket (20) is in contact with the crankshaft (101), the sliding bracket (2) is fixedly connected with the guide plate (21), and the guide plate (21) is slidably connected to the bracket (20).

8. The oil leakage detection device for the inner cavity of a ship crankshaft according to claim 7 is characterized by: Among them The position plate (21) is also provided with a factory-shaped chute.

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