Pressing tool for water system of diesel engine of diesel locomotive

Abstract

The utility model provides a pressurizing tool for a diesel engine water system of an internal combustion locomotive, and belongs to the technical field of internal combustion locomotive maintenance operation tools. The pressing tool for the water system of the diesel engine of the diesel locomotive comprises a flange plate, a connector pipe, a direct insertion type pipe joint and a valve, the connector pipe is connected to the center of the side face of the flange plate, and the valve is connected to the direct insertion type pipe joint through a connecting pipe. The direct insertion type pipe joint comprises an inner sleeve, an outer sleeve and balls arranged between the inner sleeve and the outer sleeve, the balls are embedded in the inner sleeve and arranged in a circle, an annular groove used for allowing the balls to be inserted in is formed in the surface of the connector pipe, and the outer sleeve moves towards one side of the flange plate to press the balls into the annular groove. The device has the advantages that the maintenance time and the fault elimination time are shortened, the efficiency of installing and determining the locomotive water loss fault point is high, and the accuracy rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance tools for diesel locomotives, and particularly relates to a pressure testing tool for the diesel engine water system of a diesel locomotive. Background Art

[0002] During the daily maintenance of diesel locomotives, quality problems often occur, such as the water level in the expansion tank dropping while there is no visible leakage point on the exterior. For locomotives operating with cylinders removed, it will lead to insufficient operating power of the locomotive, causing train operation delays. At the same time, during the operation with cylinders removed, due to the expansion of cracks inside the cylinders, diesel engine water hammers are likely to occur, exacerbating diesel engine failures. Also, during the process of removing cylinders, if the fuel injection pump rack does not return properly or the cylinder removal operation is incorrect, it is easy to cause the diesel engine to "run away", bringing other quality problems to the locomotive. At this time, it is necessary to conduct pressure testing on the diesel engine water system to find the fault points.

[0003] When the locomotive loses water during operation and the leakage point cannot be found during the in - depot inspection and standby state, in order to further determine the location of the water - loss fault, it is necessary to remove each cylinder one by one for inspection after the locomotive is put into operation. However, there are problems in this process:

[0004] 1. Checking each cylinder one by one by observation takes a long time and has low efficiency.

[0005] 2. Finding the water - loss fault point of the locomotive is not accurate and requires multiple confirmations.

[0006] 3. During the process of removing each cylinder one by one, there are safety hazards to the quality of the locomotive, causing uneven stress on the locomotive crankshaft.

[0007] 4. During the observation process of removing cylinders from the locomotive, internal cracks are very likely to expand, easily causing diesel engine water hammers.

[0008] 5. During the process of removing each cylinder one by one, the operating power of the locomotive will decrease, affecting the traction force. Summary of the Utility Model

[0009] To solve the above - mentioned technical problems, the utility model provides a pressure testing tool for the diesel engine water system of a diesel locomotive.

[0010] The technical solution of the utility model is realized as follows:

[0011] A pressure testing tool for the water system of a diesel engine in a diesel locomotive, comprising a flange, an interface pipe, a straight plug-in pipe joint and a valve. The interface pipe is connected to the center of the side of the flange. The valve is connected to the straight plug-in pipe joint through a connecting pipe. Among them, the straight plug-in pipe joint includes an inner sleeve, an outer sleeve and balls arranged between the inner sleeve and the outer sleeve. The balls are embedded on the inner sleeve and arranged in a circle. An annular groove for the balls to insert is arranged on the surface of the interface pipe. The outer sleeve presses the balls into the annular groove by displacing towards one side of the flange.

[0012] Further, the outer sleeve includes a first pipe body and a second pipe body. The inner diameter of the first pipe body is larger than that of the second pipe body. When the balls are located in the first pipe body, the balls are located outside the annular groove. When the balls are located in the second pipe body, the balls are pressed into the annular groove by the second pipe body.

[0013] Further, it further includes a locking component. One end of the locking component is connected to the flange, and the other end of the locking component locks the straight plug-in pipe joint by squeezing the outer sleeve towards one side of the flange.

[0014] Further, the locking component includes a telescopic rod with adjustable length and a pressing block for pressing the straight plug-in pipe joint. One end of the telescopic rod is rotatably installed on the flange, and the pressing block is fixedly installed at the other end of the telescopic rod.

[0015] Further, the telescopic rod includes a rod sleeve, a rod body and a locking nut. One end of the rod sleeve is rotatably connected to the flange. The rod body is a threaded rod. One end of the rod body is inserted into the other end of the rod sleeve. The pressing block is fixedly installed at the other end of the rod body. The locking nut is rotatably installed at the other end of the rod sleeve, and the locking nut is threadedly sleeved on the rod body.

[0016] Further, the pressing block includes a first block body, a second block body, an inclined groove and a pressing wheel. The first block body is fixedly connected to the end of the rod body far from the flange. The second block body is in a "C" shape structure. The second block body is sleeved on the first block body, and the second block body is in a state with the open end facing the rod body. The inclined groove is arranged on the inner wall surfaces on both sides of the second block body. The pressing wheels are rotatably installed on both sides of the first block body, and the two pressing wheels are respectively pressed on the inclined groove. The end of the second block body facing the rod body is used to squeeze the outer sleeve towards one side of the flange.

[0017] Further, an end plate is fixedly arranged at the end of the inner sleeve far from the flange. One end of the connecting pipe is fixedly connected to the end plate. The outer diameter of the connecting pipe is smaller than the outer diameter of the end plate. The end of the inner sleeve far from the flange extends axially beyond the end plate and forms an outer extension part. An insertion part for axially inserting between the outer extension part and the connecting pipe is arranged at one end of the first block body.

[0018] Further, the inner wall surface of the outer extension part is a conical surface, and a first inclined surface part adapted to the inner wall surface of the outer extension part is arranged on one side of the insertion part.

[0019] Further, a second inclined surface part with an inclination direction opposite to that of the first inclined surface part is arranged on the side of the first block body facing the first inclined surface part, and a receiving area for receiving the outer extension part is formed between the roots of the first inclined surface part and the second inclined surface part.

[0020] Further, when the rod body is parallel to the axial direction of the straight plug type pipe joint, the second block body contacts the outer surface of the inner sleeve.

[0021] The utility model has the following beneficial effects:

[0022] 1. By applying the pressure testing tool for the water system of the diesel engine of the diesel locomotive of the present application, the overhaul time and the fault elimination time are greatly shortened, the fault expansion caused by uneven force on the crankshaft due to long-term cylinder shedding is prevented, and the operation delay caused by insufficient locomotive operation power during the fault finding period is ensured, so that the efficiency and accuracy of determining the water loss fault point of the locomotive are high; the possibility of expanding the locomotive fault point by observing the locomotive cylinder by cylinder shedding is eliminated, and the possibility of expanding the locomotive fault point is minimized.

[0023] 2. By arranging the interface pipe to connect the straight plug type pipe joint and the connecting pipe with a valve, when connecting the flange to the pipeline to be pressurized, neither the straight plug type pipe joint nor the connecting pipe with a valve is installed on the flange, so that the overall space occupied by the flange is small, and it is more convenient for operation in a narrow space.

[0024] 3. By directly inserting the straight plug type pipe joint into the interface pipe and rotating the connecting pipe according to the actual operation environment to adjust the orientation of the connecting pipe, the phenomenon that the hose is excessively bent due to the limitation of the narrow space after connecting the external pressurized hose caused by the single orientation of the connecting pipe in the prior art is avoided, and the pressurization effect, stability and safety are improved.

[0025] 4. After the external hose is in a natural state by rotating the connecting pipe to adjust the orientation, axial and radial pressures are applied to the straight plug type pipe joint through the locking member, so as to improve the overall stability and safety.

[0026] 5. By setting the pressing block to include a first block body, a second block body, an inclined groove and a pressing wheel, when the first block body moves axially towards the flange side by rotating the locking nut, the pressing wheel can be driven to apply an extrusion effect on the inclined groove. At this time, the extrusion effect can drive the second block body to radially press the inner sleeve and axially press the outer sleeve towards the flange side, thereby synchronously applying radial and axial fastening forces to the straight plug type pipe joint and improving the stability and safety. Description of the Drawings

[0027] Figure 1is the overall schematic diagram of the present utility model;

[0028] Figure 2 is the schematic diagram of the ball of the present utility model;

[0029] Figure 3 is the schematic diagram of the annular groove of the present utility model;

[0030] Figure 4 is the overall schematic diagram of the locking component of the present utility model;

[0031] Figure 5 is the schematic diagram of the first block and the pressing wheel of the present utility model;

[0032] Figure 6 is the schematic diagram of the second block of the present utility model;

[0033] Figure 7 is the schematic diagram of the end plate and the extension part of the present utility model.

[0034] In the figure: 1. Flange; 2. Interface pipe; 3. Straight plug-in pipe joint; 3.1 Inner sleeve; 3.2 Ball; 3.3 First pipe body; 3.4 Second pipe body; 4. Valve; 5. Connecting pipe; 6. Annular groove; 7. Locking component; 7.1 Rod sleeve; 7.2 Rod body; 7.3 Locking nut; 7.4 First block; 7.5 Second block; 7.6 Inclined groove; 7.7 Pressing wheel; 8. End plate; 9. Extension part; 10. Insertion part; 11. First inclined surface; 12. Second inclined surface. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] Such as Figures 1 to 7As shown in the figure, a pressure test tool for the diesel engine water system of an internal combustion locomotive includes a flange 1, an interface pipe 2, a straight plug-in pipe joint 3 and a valve 4. The interface pipe 2 is connected to the center of the side of the flange 1. The valve 4 is connected to the straight plug-in pipe joint 3 through a connecting pipe 5. Among them, the straight plug-in pipe joint 3 includes an inner sleeve 3.1, an outer sleeve and a ball 3.2 arranged between the inner sleeve 3.1 and the outer sleeve. The ball 3.2 is embedded on the inner sleeve 3.1 and arranged in a circle. A circular groove 6 for the ball 3.2 to insert is arranged on the surface of the interface pipe 2. The outer sleeve presses the ball 3.2 into the circular groove 6 by displacing to one side of the flange 1. The flange 1 serves as the foundation and connection point of the entire pressure test tool, and can stably install the pressure test tool on the diesel engine water system that needs to be pressure tested, ensuring the stability and safety of the operation. The interface pipe 2 is connected to the center of the side of the flange 1 and is used to connect with the pipeline of the diesel engine water system to realize the access of the pressure test tool. Through the interface pipe 2, the pressure test tool can be tightly connected to the diesel engine water system pipeline and serve as the main channel for water system pressure testing. The straight plug-in pipe joint 3 is a key component of the pressure test tool. It uses the structure of the ball 3.2 and the circular groove 6 to achieve quick connection and disconnection. The combined structure of the inner sleeve 3.1 and the outer sleeve can ensure the stability and flexibility of the ball 3.2 therein. By displacing the outer sleeve, the position of the ball 3.2 can be controlled to realize the connection and disconnection of the pipe joint. By inserting and withdrawing the ball 3.2 from the circular groove 6, the straight plug-in pipe joint 3 can be conveniently connected or disconnected from the interface pipe 2, realizing quick installation and disassembly and improving work efficiency. The valve 4 is connected to the straight plug-in pipe joint 3 through a connecting pipe 5. By opening and adjusting the valve 4, the flow and pressure of the water system can be controlled to ensure the safety and accuracy during the pressure test process.

[0037] The outer sleeve includes a first pipe body 3.3 and a second pipe body 3.4. The inner diameter of the first pipe body 3.3 is larger than the inner diameter of the second pipe body 3.4. When the ball 3.2 is located in the first pipe body 3.3, the ball 3.2 is located outside the circular groove 6. When the ball 3.2 is located in the second pipe body 3.4, the ball 3.2 is pressed into the circular groove 6 by the second pipe body 3.4. After the straight plug-in pipe joint 3 is completely inserted into the interface pipe 2, the outer sleeve displaces to one side of the flange 1, so that the ball 3.2 moves from the first pipe body 3.3 into the second pipe body 3.4. Since the inner diameter of the second pipe body 3.4 is smaller, the ball 3.2 will be forced to move inward and finally be pressed into the circular groove 6 on the surface of the interface pipe 2.

[0038] It also includes a locking component 7. One end of the locking component 7 is connected to the flange 1, and the other end of the locking component 7 locks the straight plug-in pipe joint 3 by squeezing the outer sleeve to one side of the flange 1. After the ball 3.2 is pressed into the circular groove 6 by the second pipe body 3.4 to achieve preliminary connection, the locking component 7 makes the connection more stable by squeezing the outer sleeve, ensuring the stable connection between the straight plug-in pipe joint 3 and the interface pipe 2 and preventing loosening or leakage during the pressure test process.

[0039] The locking component 7 includes a telescopic rod with adjustable length and a pressing block for pressing the straight plug-in pipe joint 3. One end of the telescopic rod is rotatably installed on the flange 1, and the pressing block is fixedly installed at the other end of the telescopic rod. The rotatable installation of one end of the telescopic rod on the flange 1 enables the locking component 7 to be flexibly adjusted as needed to better cooperate with the installation and disassembly of the straight plug-in pipe joint 3. By pressing the pressing block against the straight plug-in pipe joint 3, it is tightly connected to the interface pipe 2, ensuring the firmness and stability of the connection.

[0040] The telescopic rod includes a rod sleeve 7.1, a rod body 7.2, and a locking nut 7.3. One end of the rod sleeve 7.1 is rotatably connected to the flange 1. The rod body 7.2 is a threaded rod. One end of the rod body 7.2 is inserted into the other end of the rod sleeve 7.1. The pressing block is fixedly installed at the other end of the rod body 7.2. The locking nut 7.3 is rotatably installed at the other end of the rod sleeve 7.1, and the locking nut 7.3 is threadedly sleeved outside the rod body 7.2. By rotating the locking nut 7.3, the position of the rod body 7.2 in the rod sleeve 7.1 can be conveniently adjusted, thereby changing the position and locking force of the pressing block.

[0041] The pressing block includes a first block body 7.4, a second block body 7.5, an inclined groove 7.6, and a pressing wheel 7.7. The first block body 7.4 is fixedly connected to the end of the rod body 7.2 away from the flange 1. The second block body 7.5 is in a "C" shape. The second block body 7.5 is sleeved on the first block body 7.4 and is in a state with the open end facing the rod body 7.2. The inclined groove 7.6 is provided on the inner wall surfaces on both sides of the second block body 7.5. The pressing wheels 7.7 are rotatably installed on both sides of the first block body 7.4, and the two pressing wheels 7.7 are respectively pressed on the inclined groove 7.6. The end of the second block body 7.5 facing the rod body 7.2 is used to squeeze the outer sleeve tube towards one side of the flange 1. When the first block body 7.4 moves axially towards the flange 1 side by rotating the locking nut 7.3, it drives the pressing wheels 7.7 to exert a squeezing effect on the inclined groove 7.6, driving the second block body 7.5 to radially press the inner sleeve tube 3.1 and at the same time axially squeeze the outer sleeve tube towards the flange 1 side, thereby realizing the squeezing of the outer sleeve tube and at the same time applying radial and axial fastening forces to the straight plug-in pipe joint 3, improving stability and safety.

[0042] One end of the inner sleeve 3.1 away from the flange 1 is fixedly provided with an end plate 8. One end of the connecting pipe 5 is fixedly connected to the end plate 8, and the outer diameter of the connecting pipe 5 is smaller than the outer diameter of the end plate 8. One end of the inner sleeve 3.1 away from the flange 1 extends axially out of the end plate 8 to form an outer extension 9. One end of the first block 7.4 is provided with an insertion portion 10 for axially inserting between the outer extension 9 and the connecting pipe 5. The end plate 8 provides a stable installation foundation for the connecting pipe 5 and also helps to enhance the strength of the inner sleeve 3.1. Through the cooperation of the outer extension 9 and the insertion portion 10, the pressing block can be stably inserted and fixed between the inner sleeve 3.1 and the connecting pipe 5, further enhancing the stability of the connection.

[0043] The inner wall surface of the outer extension 9 is a conical surface. One side of the insertion portion 10 is provided with a first inclined surface portion 11 adapted to the inner wall surface of the outer extension 9. The design of the first inclined surface portion 11 enables the insertion portion 10 to closely fit the conical inner wall surface of the outer extension 9, forming a stable contact surface and enhancing the tightness and reliability of the connection.

[0044] One side of the first block 7.4 facing the first inclined surface portion 11 is provided with a second inclined surface portion 12 with an inclination direction opposite to that of the first inclined surface portion 11, and a receiving area for receiving the outer extension 9 is formed between the roots of the first inclined surface portion 11 and the second inclined surface portion 12. The first inclined surface portion 11 and the second inclined surface portion 12 simultaneously play a guiding role, enabling the first block 7.4 to be more easily and accurately inserted into the outer extension 9, thereby guiding the outer extension 9 into the receiving area, applying axial and radial pressures to the straight plug-in pipe joint 3, and improving the stability of the connection.

[0045] When the rod body 7.2 is parallel to the axis of the straight plug-in pipe joint 3, the second block 7.5 contacts the outer surface of the inner sleeve 3.1. When the rod body 7.2 is parallel to the axis of the straight plug-in pipe joint 3, the second block 7.5 can completely fit on the outer surface of the inner sleeve 3.1, enabling the second block 7.5 to radially press the inner sleeve 3.1 while axially squeezing the outer sleeve towards the flange 1 side, enhancing the stability of the entire connection system.

[0046] Before performing the water system pressure test operation, first insert the plug-in pipe joint 3 into the interface pipe 2 of the flange 1. During the displacement process, the ball 3.2 is pressed from the first pipe body 3.3 to the second pipe body 3.4 into the annular groove 6 of the interface pipe 2, realizing the sealed connection between the plug-in pipe joint 3 and the interface pipe 2. Then connect the connecting pipe 5 to the end plate 8 of the plug-in pipe joint 3. At this time, the connecting pipe 5 can be rotated according to the actual working environment through the ball 3.2 to adjust the orientation of the connecting pipe 5, ensuring that the hose will not be excessively bent due to the limitation of the narrow space after connecting the external pressure hose. By rotating the rod sleeve 7.1 to drive the pressing block to rotate, and controlling the length of the telescopic rod by rotating the locking nut 7.3, when the first block 7.4 displaces axially towards the flange 1 side, it drives the pressing wheel 7.7 to squeeze the inclined groove 7.6, and a radial force will be applied along the inclined groove 7.6 to drive the second block 7.5 to radially press the inner sleeve 3.1 while axially squeezing the outer sleeve towards the flange 1 side, improving the stability and safety of the connection. During the extrusion process, the insertion part 10 of the first block 7.4 is inserted between the outer extension part 9 of the inner sleeve 3.1 and the connecting pipe 5, the first inclined surface 11 fits on the inner wall surface of the outer extension part 9, and the outer extension part 9 is accommodated between the first inclined surface 11 and the second inclined surface 12, locking the plug-in pipe joint 3 and the interface pipe 2. Open the valve 4 to allow water to pass through components such as the interface pipe 2 and the plug-in pipe joint 3 and enter the water system of the diesel engine of the diesel locomotive for the pressure test operation. After the pressure test operation is completed, close the valve 4 to stop the water flow. Reverse-rotate the locking nut 7.3, and then reverse-rotate the rod sleeve 7.1 to release the locking of the plug-in pipe joint 3, pull the outer sleeve back from the position of the second pipe body 3.4 to the position of the first pipe body 3.3, disconnect the connection between the plug-in pipe joint 3 and the interface pipe 2, and complete the pressure test operation.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water system pressure tool for a diesel engine of an internal combustion engine locomotive, characterized in that: It includes a flange (1), an interface pipe (2), a direct-insert pipe joint (3) and a valve (4). The interface pipe (2) is connected to the center of the side of the flange (1). The valve (4) is connected to the direct-insert pipe joint (3) through a connecting pipe (5). Among them, the direct-insert pipe joint (3) includes an inner sleeve (3.1), an outer sleeve and balls (3.2) arranged between the inner sleeve (3.1) and the outer sleeve. The balls (3.2) are embedded on the inner sleeve (3.1) and arranged in a circle. An annular groove (6) for the balls (3.2) to insert is arranged on the surface of the interface pipe (2). The outer sleeve presses the balls (3.2) into the annular groove (6) by displacing towards one side of the flange (1).

2. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 1, characterized in that: The outer sleeve includes a first pipe body (3.3) and a second pipe body (3.4). The inner diameter of the first pipe body (3.3) is larger than that of the second pipe body (3.4). When the balls (3.2) are located in the first pipe body (3.3), the balls (3.2) are located outside the annular groove (6). When the balls (3.2) are located in the second pipe body (3.4), the balls (3.2) are pressed into the annular groove (6) by the second pipe body (3.4).

3. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 1, characterized in that: It also includes a locking component (7). One end of the locking component (7) is connected to the flange (1), and the other end of the locking component (7) locks the direct-insert pipe joint (3) by squeezing the outer sleeve towards one side of the flange (1).

4. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 3, characterized in that: The locking component (7) includes a telescopic rod with adjustable length and a pressing block for pressing the direct-insert pipe joint (3). One end of the telescopic rod is rotatably installed on the flange (1), and the pressing block is fixedly installed at the other end of the telescopic rod.

5. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 4, characterized in that: The telescopic rod includes a rod sleeve (7.1), a rod body (7.2) and a locking nut (7.3). One end of the rod sleeve (7.1) is rotatably connected to the flange (1). The rod body (7.2) is a threaded rod. One end of the rod body (7.2) is inserted into the other end of the rod sleeve (7.1). The pressing block is fixedly installed at the other end of the rod body (7.2). The locking nut (7.3) is rotatably installed at the other end of the rod sleeve (7.1), and the locking nut (7.3) is threadedly sleeved outside the rod body (7.2).

6. A water system pressure-reducing tool for a diesel engine of a diesel locomotive as claimed in claim 5, characterized in that: The pressing block includes a first block body (7.4), a second block body (7.5), an inclined groove (7.6) and a pressing wheel (7.7). The first block body (7.4) is fixedly connected to the end of the rod body (7.2) far from the flange (1). The second block body (7.5) is in a "C" shape structure. The second block body (7.5) is sleeved on the first block body (7.4), and the second block body (7.5) is in a state with the open end facing the rod body (7.2). The inclined groove (7.6) is arranged on the inner wall surfaces of both sides of the second block body (7.5). The pressing wheels (7.7) are rotatably installed on both sides of the first block body (7.4), and the two pressing wheels (7.7) are respectively pressed on the inclined groove (7.6). The end of the second block body (7.5) facing the rod body (7.2) is used to squeeze the outer sleeve towards one side of the flange (1).

7. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 6, characterized in that: An end plate (8) is fixedly provided at one end of the inner sleeve (3.1) away from the flange (1), one end of the connecting pipe (5) is fixedly connected to the end plate (8), and the outer diameter of the connecting pipe (5) is smaller than the outer diameter of the end plate (8). The end of the inner sleeve (3.1) away from the flange (1) extends axially out of the end plate (8) to form an extension portion (9), and one end of the first block (7.4) is provided with an insertion portion (10) for axially inserting between the extension portion (9) and the connecting pipe (5).

8. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 7, characterized in that: The inner wall surface of the extending portion (9) is a conical surface, and one side of the inserting portion (10) is provided with a first inclined portion (11) adapted to the inner wall surface of the extending portion (9).

9. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 7, characterized in that: A second inclined portion (12) with an inclination direction opposite to that of the first inclined portion (11) is provided on one side of the first block (7.4) facing the first inclined portion (11), and an accommodating area for accommodating the protruding portion (9) is formed between the roots of the first inclined portion (11) and the second inclined portion (12).

10. A water system pressure relief tool for a diesel engine of a diesel locomotive as claimed in claim 9, characterized in that: When the rod body (7.2) is parallel to the axial direction of the straight-insertion pipe joint (3), the second block (7.5) contacts the outer surface of the inner sleeve (3.1).

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