Quick-change ventilation plug applied to drive axle

Abstract

The invention discloses a quick-change ventilation plug applied to a drive axle, and relates to the technical field of quick-change ventilation plugs of drive axles, the quick-change ventilation plug applied to the drive axle comprises a ventilation plug body arranged on a drive axle body, and a ventilation pipe is arranged on the ventilation plug body; and a mounting seat for assisting the mounting of the ventilation plug body is fixed on the drive axle body. In the use process of the drive axle, the ventilation plug connected with the ventilation pipe is matched with the threads of the mounting base, automatic air leakage and pressure relief after high pressure in the drive axle is assisted through the control assembly, and safe and stable use of the drive axle is facilitated; and through mutual cooperation of the quick-disassembly mounting assembly, the pushing assembly, the extrusion assembly and other parts, the outer side of the breather pipe can be evenly extruded conveniently, the breather pipe can be assisted to be popped out of the annular mounting cavity subsequently while the mounting effect of the breather pipe is guaranteed, and the quick disassembly effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of quick-change vent plugs for drive axles, and in particular to a quick-change vent plug applied to drive axles. Background Art

[0002] The interior of a car drive axle is a confined space with a certain amount of lubricating oil stored to ensure the normal use of rotating parts such as gears and bearings. During the driving process of the vehicle, the high-speed rotation of gears and bearings generates heat, the temperature of the confined space rises, and the pressure increases. If the pressure is not relieved in time, gear oil leakage will occur. Usually, a vent plug is set on the bridge housing. The function of the vent plug is to connect the inside of the drive axle with the outside world to keep the air pressure inside and outside the drive axle consistent. At the same time, it is also necessary to prevent external mud, water, sand and gravel from entering the cavity and causing the lubricating oil to be contaminated and deteriorate.

[0003] Since the oil temperature rises due to the high-speed operation of the gears inside the bridge housing, the generated oil vapor will condense in the breather pipe, causing oil seepage and leakage. Therefore, it is necessary to regularly maintain and replace the breather pipe and clean the breather plug. The existing breather pipe and the breather plug are connected by interference fit and are fixed with a clamp. The fixing method is relatively cumbersome, and the clamp locking process will cause the locking to have different tightness around the week, affecting the installation and replacement effect of the breather pipe. For this reason, we propose a quick-change breather plug for use in a drive axle. Summary of the invention

[0004] The object of the present invention is to provide a quick-change vent plug applied to a drive axle to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a quick-change vent plug applied to a drive axle, comprising a vent plug body arranged on a drive axle bridge body, a vent pipe arranged on the vent plug body, a mounting seat for assisting the installation of the vent plug body fixed on the drive axle bridge body, the vent plug body and the mounting seat being detachably installed by means of threads; further comprising a control component for ventilation control arranged on the vent plug body, an adjustment component for ventilation control adjustment and a guide component for guiding during the adjustment process arranged on the vent plug body, a connecting pipe being fixed on one side of the vent plug body, a quick-release installation component for quick-release installation of the vent pipe arranged on the connecting pipe;

[0006] The quick-release installation assembly includes a mounting sleeve fixed to the outside of the connecting tube in a sleeved state, a shrinking sleeve is fixed to one side of the mounting sleeve, an annular mounting cavity for inserting the end of the vent pipe is formed between the inner side of the shrinking sleeve and the outer side of the connecting tube, a pushing assembly for assisting in the separation of the vent pipe after installation is provided inside the annular cavity, a conical surface is provided on the outer side of the shrinking sleeve, a plurality of groups of openings for assisting in the shrinking of the shrinking sleeve after squeezing are provided on the shrinking sleeve, and an extrusion assembly for extruding the shrinking sleeve is provided on the outer side of the shrinking sleeve.

[0007] Preferably, the extrusion assembly includes an extrusion cylinder sleeved on the outside of the shrinking cylinder, the interior of the extrusion cylinder is provided with a conical groove for extrusion against the conical surface, the conical surface and the conical groove are matched with each other, and a transmission assembly for transmitting the extrusion cylinder is provided on the outside of the mounting sleeve.

[0008] Preferably, the transmission assembly includes a rotating cylinder sleeved on the outside of the mounting sleeve, the inner side of the rotating cylinder is meshed with the outer side of the mounting sleeve by means of a thread, a driving ring for rotating the rotating cylinder is fixed on the rotating cylinder, and a connecting assembly for rotating the extrusion cylinder is provided between the driving ring and the end of the extrusion cylinder.

[0009] Preferably, the connecting assembly includes an annular groove opened at the end of the rotating cylinder, the annular groove is rotatably connected to an annular block inside, the annular block is fixed to one end of the extrusion cylinder, the rotating cylinder, the annular groove, the annular block and the extrusion cylinder are concentrically arranged, and the cross-section of the annular groove and the annular block is T-shaped.

[0010] Preferably, the pushing components are provided in a plurality of groups, and the plurality of pushing components are arranged in a state of an annular array inside the annular installation cavity.

[0011] Preferably, the pushing assembly includes a round rod slidably connected to one end of the mounting sleeve, a first baffle and a second baffle are respectively fixed at both ends of the round rod, the first baffle is located inside the annular mounting cavity, a pushing spring is provided on the outer side of the round rod, and both ends of the pushing spring are respectively connected to the first baffle and the inner wall of the mounting sleeve, and a scale line is provided on the round rod for identifying the distance the round rod slides out on the mounting sleeve.

[0012] Preferably, the control component includes an operating chamber opened inside the vent plug body, a connecting hole is provided between the operating chamber and the outside of the vent plug body, a conical cavity in a conical shape is provided between the connecting hole and the operating chamber, a ball for blocking the connecting hole is provided inside the conical cavity, and an elastic component for squeezing and pushing the ball is provided inside the operating chamber.

[0013] Preferably, the elastic component includes a circular plate arranged inside the operating cavity, a first sleeve is fixed on the circular plate, a first slide rod is slidably connected to the first sleeve, one end of the first slide rod is fixed to the sphere, an extrusion spring is sleeved on the outer side of the first sleeve, two ends of the extrusion spring are respectively arranged to resist the circular plate and the sphere, and a plurality of groups of circular holes are provided on the circular plate.

[0014] Preferably, the adjustment assembly includes a threaded tube rotatably connected to the upper end of the vent plug body, a threaded rod is threadedly engaged on the threaded tube, one end of the threaded rod is fixed to a circular plate, and a driving pin for rotating the threaded tube is fixed to the other end of the threaded tube.

[0015] Preferably, the guide assembly includes two groups of second sleeves fixed inside the operating cavity, the two groups of second sleeves are symmetrically arranged on both sides of the threaded tube, the second sleeves are slidably connected to a second slide rod, and one end of the second slide rod is fixed to the circular plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] During the use of the drive axle of the present invention, the vent plug connected to the vent pipe is matched with the thread of the mounting seat, and the control component assists in the automatic deflation and pressure relief after the high pressure inside the drive axle, so as to facilitate the safe and stable use of the drive axle. During the use of the vent plug, the quick-release mounting component, the pushing component and the extrusion component cooperate with each other, so as to facilitate the uniform extrusion of the outer side of the vent pipe, which ensures the installation effect of the vent pipe and can assist the vent pipe to pop out from the annular mounting cavity later, so as to achieve the effect of quick disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the vent plug and the vent pipe of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the control component and the elastic component of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the adjustment component and the guide component of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the extrusion assembly, the transmission assembly and the connection assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the quick-release installation assembly of the present invention;

[0024] Figure 7It is a schematic diagram of the structure of the driving component of the present invention;

[0025] Figure 8 It is a schematic diagram of the state after the ventilation pipe of the present invention is installed on the connecting pipe.

[0026] In the figure: 101, vent plug body; 102, vent pipe; 103, drive bridge body; 104, mounting seat; 201, operating cavity; 202, connecting hole; 203, conical cavity; 204, sphere; 301, round plate; 302, first sleeve; 303, first slide rod; 304, extrusion spring; 305, round hole; 401, threaded tube; 402, threaded rod; 403, drive pin; 501, second sleeve ; 502, second slide rod; 6, connecting pipe; 701, mounting sleeve; 702, shrinking cylinder; 703, conical surface; 704, opening; 801, extrusion cylinder; 802, conical groove; 901, rotating cylinder; 902, driving ring; 1001, annular groove; 1002, annular block; 1101, round rod; 1102, first baffle; 1103, second baffle; 1104, push spring; 1105, scale line. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figure 1-Figure 8 , a quick-change vent plug applied to a drive axle shown in the figure includes a vent plug body 101 arranged on a drive axle bridge body 103, a vent pipe 102 is arranged on the vent plug body 101, a mounting seat 104 for assisting the installation of the vent plug body 101 is fixed on the drive axle bridge body 103, and the vent plug body 101 and the mounting seat 104 are detachably installed by means of threads; it also includes a control component for ventilation control arranged on the vent plug body 101, an adjustment component for ventilation control adjustment and a guide component for guiding during the adjustment process are arranged on the vent plug body 101, a connecting pipe 6 is fixed on one side of the vent plug body 101, and a quick-release installation component for quick-release installation of the vent pipe 102 is arranged on the connecting pipe 6;

[0030] The quick-release installation assembly includes an installation sleeve 701 fixed to the outside of the connecting tube 6 in a sleeved state, a shrinking tube 702 is fixed to one side of the installation sleeve 701, an annular installation cavity for inserting the end of the vent pipe 102 is formed between the inner side of the shrinking tube 702 and the outer side of the connecting tube 6, a pushing assembly for assisting the separation of the vent pipe 102 after installation is arranged inside the annular cavity, a conical surface 703 is arranged on the outer side of the shrinking tube 702, a plurality of groups of openings 704 for assisting the shrinking tube 702 to shrink after squeezing the shrinking tube 702 are arranged on the shrinking tube 702, and an extrusion assembly for extruding the shrinking tube 702 is arranged on the outer side of the shrinking tube 702;

[0031] It should be noted here that during the use of the drive axle, the vent plug connected to the vent pipe 102 is matched with the thread of the mounting seat 104, and the control component assists in the automatic deflation and pressure relief after the high pressure inside the drive axle, so as to facilitate the safe and stable use of the drive axle. During the use of the vent plug, the quick-release mounting component, the pushing component and the extrusion component cooperate with each other to facilitate the uniform extrusion of the outside of the vent pipe 102, which ensures the installation effect of the vent pipe 102 and can assist the vent pipe 102 to pop out from the annular mounting cavity later, so as to achieve the effect of quick disassembly.

[0032] The extrusion assembly includes an extrusion cylinder 801 sleeved on the outside of the shrinking cylinder 702, and a conical groove 802 for abutting against the conical surface 703 for extrusion is provided inside the extrusion cylinder 801, and the conical surface 703 and the conical groove 802 are matched with each other. A transmission assembly for transmitting the extrusion cylinder 801 is provided on the outside of the mounting sleeve 701;

[0033] It should be noted here that: through transmission, the extrusion cylinder 801 is driven to move synchronously. During the movement of the extrusion cylinder 801, the conical groove 802 of the extrusion cylinder 801 is abutted against the conical surface 703 on the outside of the shrinking cylinder 702. Through the abutting extrusion effect and the opening of multiple groups of openings 704 on the shrinking cylinder 702, the inner hole of the shrinking cylinder 702 is forced to shrink evenly. In the process of shrinkage, the inner wall of the shrinking cylinder 702 is abutted against the outside of the ventilation pipe 102. Through the abutting extrusion effect, the inserted ventilation pipe 102 is limited by abutment, thereby completing the installation limit of the ventilation pipe 102.

[0034] Preferably, the transmission assembly includes a rotating cylinder 901 sleeved on the outside of the mounting sleeve 701, the inner side of the rotating cylinder 901 is meshed and connected with the outer side of the mounting sleeve 701 by means of threads, a driving ring 902 for driving the rotating cylinder 901 to rotate is fixed on the rotating cylinder 901, and a connecting assembly for connecting the extruding cylinder 801 to rotate is provided between the driving ring 902 and the end of the extruding cylinder 801;

[0035] It should be noted here that: the rotating cylinder 901 is driven to rotate by the driving ring 902. During the rotation of the rotating cylinder 901, the rotating cylinder 901 is moved on the outside of the mounting sleeve 701 through the mutual engagement transmission between the rotating cylinder 901 and the outside of the mounting sleeve 701. During the movement of the rotating cylinder 901, the extrusion cylinder 801 is driven to move synchronously through the connection between the annular groove 1001 and the annular block 1002.

[0036] Preferably, the connecting assembly includes an annular groove 1001 opened at the end of the rotating cylinder 901, and an annular block 1002 is rotatably connected inside the annular groove 1001. The annular block 1002 is fixed to one end of the extrusion cylinder 801. The rotating cylinder 901, the annular groove 1001, the annular block 1002 and the extrusion cylinder 801 are concentrically arranged, and the cross-sections of the annular groove 1001 and the annular block 1002 are T-shaped.

[0037] It should be noted here that the annular groove 1001 and the annular block 1002 facilitate the rotatable connection between the extrusion cylinder 801 and the rotating cylinder 901 .

[0038] Preferably, there are multiple groups of pushing components, and the multiple groups of pushing components are arranged in a state of an annular array inside the annular installation cavity;

[0039] It should be noted here that the pushing effect is guaranteed by using multiple sets of pushing components.

[0040] Preferably, the pushing assembly includes a round rod 1101 slidably connected to one end of the mounting sleeve 701, a first baffle 1102 and a second baffle 1103 are fixed to the two ends of the round rod 1101, the first baffle 1102 is located inside the annular mounting cavity, a pushing spring 1104 is sleeved on the outer side of the round rod 1101, and the two ends of the pushing spring 1104 are respectively connected to the first baffle 1102 and the inner wall of the mounting sleeve 701, and a scale line 1105 for identifying the sliding distance of the round rod 1101 on the mounting sleeve 701 is opened on the round rod 1101;

[0041] It should be noted here that: during the installation of the ventilation pipe 102, the front end of the ventilation pipe 102 is inserted into the interior of the annular installation cavity. During the insertion process, the front end of the ventilation pipe 102 is abutted against the first baffle 1102 on each group of extrusion components. During the abutment process, the round rod 1101 is pushed to slide outward, and the distance that the round rod 1101 slides outward is used to judge whether the depth of the ventilation pipe 102 inserted into the interior of the annular installation cavity during connection meets the standard. When the ventilation pipe 102 needs to be disassembled, the inner hole of the shrinkage tube 702 is no longer contracted through transmission. At this time, the elastic force of the push spring 1104 on the first baffle 1102 and the abutment of the first baffle 1102 on the end of the ventilation pipe 102 are used to facilitate the auxiliary ventilation pipe 102 to pop out from the annular installation cavity, thereby achieving the effect of quick disassembly.

[0042] Preferably, the control component includes an operation cavity 201 opened inside the vent plug body 101, a communication hole 202 is provided between the operation cavity 201 and the outside of the vent plug body 101, a conical cavity 203 arranged in a conical shape is provided between the communication hole 202 and the operation cavity 201, a ball 204 for blocking the communication hole 202 is provided inside the conical cavity 203, and an elastic component for squeezing and pushing the ball 204 is provided inside the operation cavity 201;

[0043] It should be noted here that: due to the heat generated by the high-speed rotation of the drive axle gears and bearings, the temperature of the enclosed space rises. When the pressure inside the drive axle is greater than the squeezing force of the extrusion spring 304 on the ball 204, the pressure inside the drive axle pushes the ball 204 to no longer block the connecting hole 202. At this time, the high-pressure gas generated inside the drive axle can be discharged to the outside through the connecting hole 202, the operating cavity 201, the connecting pipe 6 and the ventilation pipe 102, assisting the automatic degassing and pressure relief after the high pressure inside the drive axle.

[0044] Preferably, the elastic component includes a circular plate 301 disposed inside the operating cavity 201, a first sleeve 302 is fixed on the circular plate 301, a first slide bar 303 is slidably connected to the first sleeve 302, one end of the first slide bar 303 is fixed to the ball 204, an extrusion spring 304 is sleeved on the outer side of the first sleeve 302, two ends of the extrusion spring 304 are respectively set against the circular plate 301 and the ball 204, and a plurality of groups of circular holes 305 are opened on the circular plate 301;

[0045] It should be noted here that: the first sleeve 302 and the first slide rod 303 between the circular plate 301 and the sphere 204 facilitate the telescopic connection between the auxiliary sphere 204 and the circular plate 301, and the extrusion spring 304 facilitates the extrusion and push of the sphere 204 so that the sphere 204 and the connecting hole 202 are abutted and blocked.

[0046] Preferably, the adjustment assembly includes a threaded tube 401 rotatably connected to the upper end of the vent plug body 101, a threaded rod 402 is threadedly engaged with the threaded tube 401, one end of the threaded rod 402 is fixed to the circular plate 301, and a driving pin 403 for rotating the threaded tube 401 is fixed to the other end of the threaded tube 401; the guide assembly includes two groups of second sleeves 501 fixed inside the operating cavity 201, the two groups of second sleeves 501 are symmetrically arranged on both sides of the threaded tube 401, and a second slide rod 502 is slidably connected to the second sleeve 501, and one end of the second slide rod 502 is fixed to the circular plate 301;

[0047] It should be noted here that: the threaded tube 401 is driven to rotate by the driving pin 403. During the rotation of the threaded tube 401, the circular plate 301 is driven to move under force through the mutual meshing transmission between the threaded tube 401 and the threaded rod 402. During the movement of the circular plate 301, the circular plate 301 subjected to force is lifted and lowered inside the operating chamber 201 of the vent plug body 101 through the sliding guiding effect of the second sleeve 501 and the second slide rod 502. During the lifting and lowering of the circular plate 301, the circular plate 301 is moved toward or away from the ball 204 that is against the connecting hole 202. During the movement, the compression amount of the extrusion spring 304 is changed and the ball 204 is squeezed and pushed with different elastic forces to adjust the abutting pressure between the ball 204 and the connecting hole 202. By adjusting the abutting pressure, the automatic exhaust and pressure relief operation can be performed at different pressure values ​​during the automatic pressure relief control of the drive axle.

[0048] In this solution: A quick-change vent plug applied to a drive axle comprises the following steps:

[0049] When the drive axle is in use, the vent plug connected with the vent pipe 102 is installed on the drive axle through the threaded fit with the mounting seat 104, and the vent plug is communicated with the interior of the drive axle. After the vent plug is installed, the temperature of the enclosed space rises due to the high-speed rotation of the drive axle gears and bearings, and when the pressure inside the drive axle is greater than the squeezing force of the squeezing spring 304 on the ball 204, the pressure inside the drive axle pushes the ball 204 to no longer block the connecting hole 202. At this time, the high-pressure gas generated inside the drive axle can be discharged outward through the connecting hole 202, the operating cavity 201, the connecting pipe 6 and the vent pipe 102, which assists the automatic degassing and pressure relief after the high pressure inside the drive axle, and facilitates the safe and stable use of the drive axle.

[0050] In the process of automatically controlling the pressure relief inside the driving axle, the threaded tube 401 is driven to rotate through the driving pin 403. During the rotation of the threaded tube 401, the circular plate 301 is driven to move under force through the mutual meshing transmission between the threaded tube 401 and the threaded rod 402. During the movement of the circular plate 301, the circular plate 301 under force is moved up and down inside the operating chamber 201 of the vent plug body 101 through the sliding guiding effect of the second sleeve 501 and the second slide rod 502. During the process, the circular plate 301 is moved toward or away from the ball 204 abutting against the connecting hole 202. During the movement, the compression amount of the extrusion spring 304 is changed and the ball 204 is squeezed and pushed with different elastic forces, so as to adjust the abutting pressure between the ball 204 and the connecting hole 202. By adjusting the abutting pressure, the automatic exhaust pressure relief operation can be performed at different pressure values ​​during the automatic pressure relief control of the drive axle, so that the process of using the vent plug to assist the automatic pressure relief control of the drive axle is more flexible and adjustable;

[0051] The use of the vent plug will cause the oil vapor to condense in the vent pipe 102, causing oil seepage and leakage. Therefore, the vent pipe 102 needs to be regularly maintained and replaced and the vent plug needs to be cleaned. During the installation of the vent pipe 102, the front end of the vent pipe 102 is inserted into the inside of the annular installation cavity. During the insertion process, the front end of the vent pipe 102 is abutted against the first baffle 1102 on each group of extrusion components. During the abutment process, the round rod 1101 is pushed to slide outward, and the vent pipe is judged by the distance the round rod 1101 slides outward. When connecting, check whether the depth of 102 inserted into the annular installation cavity meets the standard. After one end of the vent pipe 102 is inserted, the driving ring 902 drives the rotating cylinder 901 to rotate. During the rotation of the rotating cylinder 901, the rotating cylinder 901 and the outer side of the installation sleeve 701 are meshed with each other to drive the rotating cylinder 901 to move outside the installation sleeve 701. During the movement of the rotating cylinder 901, the connection between the annular groove 1001 and the annular block 1002 drives the extrusion cylinder 801 to move synchronously. During the movement of the cylinder 801, the conical groove 802 of the extrusion cylinder 801 is abutted against the conical surface 703 on the outer side of the shrink cylinder 702. Through the abutting and squeezing effect and the opening effect of the multiple groups of openings 704 on the shrink cylinder 702, the inner hole of the shrink cylinder 702 is subjected to force to shrink evenly. During the shrinking process, the inner wall of the shrink cylinder 702 is abutted against the outer side of the vent pipe 102. Through the abutting and squeezing effect, the inserted vent pipe 102 is abutted and limited, and the installation and limiting of the vent pipe 102 are completed. During the process of limited installation, the uniform contraction of the inner hole of the shrinking tube 702 facilitates the uniform squeezing of the outer side of the vent pipe 102, thereby ensuring the installation effect of the vent pipe 102. When the vent pipe 102 needs to be disassembled, the inner hole of the shrinking tube 702 is no longer contracted through transmission. At this time, the elastic force of the pushing spring 1104 on the first baffle 1102 and the counteraction of the first baffle 1102 on the end of the vent pipe 102 facilitate the auxiliary vent pipe 102 to pop out from the annular installation cavity, thereby achieving the effect of quick disassembly.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-change vent plug for a drive axle, comprising: A vent plug body (101) is arranged on a drive axle bridge body (103), a vent pipe (102) is arranged on the vent plug body (101), a mounting seat (104) for assisting the installation of the vent plug body (101) is fixed on the drive axle bridge body (103), and the vent plug body (101) and the mounting seat (104) are detachably mounted via threads; It is characterized by further comprising: A control component for ventilation control arranged on the vent plug body (101); an adjustment component for ventilation control adjustment and a guide component for guiding during the adjustment process are arranged on the vent plug body (101); a connecting pipe (6) is fixedly connected to one side of the vent plug body (101); a quick-release installation component for quick-release installation of the vent pipe (102) is arranged on the connecting pipe (6); The quick-release installation assembly comprises an installation sleeve (701) fixed on the outside of the connecting tube (6) in a sleeved state, a shrinking tube (702) is fixed on one side of the installation sleeve (701), an annular installation cavity for inserting the end of the vent tube (102) is formed between the inner side of the shrinking tube (702) and the outer side of the connecting tube (6), a pushing assembly for assisting the separation of the vent tube (102) after installation is arranged inside the annular cavity, a conical surface (703) is provided on the outer side of the shrinking tube (702), a plurality of openings (704) are provided on the shrinking tube (702) for assisting the shrinking tube (702) to shrink after squeezing, and an extrusion assembly for squeezing the shrinking tube (702) is arranged on the outer side of the shrinking tube (702).

2. The quick-change vent plug for a drive axle according to claim 1, characterized in that: The extrusion assembly comprises an extrusion cylinder (801) sleeved on the outside of a shrinking cylinder (702); a conical groove (802) for pressing against a conical surface (703) is provided inside the extrusion cylinder (801); the conical surface (703) and the conical groove (802) are matched with each other; and a transmission assembly for transmitting the extrusion cylinder (801) is provided on the outside of the mounting sleeve (701).

3. The quick-change vent plug for a drive axle according to claim 2, characterized in that: The transmission assembly comprises a rotating cylinder (901) sleeved on the outside of the mounting sleeve (701); the inner side of the rotating cylinder (901) is meshedly connected with the outer side of the mounting sleeve (701) by means of a thread; a driving ring (902) for driving the rotating cylinder (901) to rotate is fixed on the rotating cylinder (901); a connecting assembly for connecting the extrusion cylinder (801) to rotate is provided between the driving ring (902) and the end of the extrusion cylinder (801).

4. The quick-change vent plug for a drive axle according to claim 3, characterized in that: The connecting assembly comprises an annular groove (1001) formed at the end of a rotating cylinder (901); an annular block (1002) is rotatably connected inside the annular groove (1001); the annular block (1002) is fixed to one end of an extrusion cylinder (801); the rotating cylinder (901), the annular groove (1001), the annular block (1002) and the extrusion cylinder (801) are concentrically arranged; and the cross-sections of the annular groove (1001) and the annular block (1002) are T-shaped.

5. The quick-change vent plug for a drive axle according to claim 1, characterized in that: The pushing components are provided in a plurality of groups, and the plurality of pushing components are arranged in a state of an annular array inside the annular installation cavity.

6. The quick-change vent plug for a drive axle according to claim 5, characterized in that: The pushing assembly comprises a round rod (1101) slidably connected to one end of a mounting sleeve (701); a first baffle (1102) and a second baffle (1103) are respectively fixed at two ends of the round rod (1101); the first baffle (1102) is located inside the annular mounting cavity; a pushing spring (1104) is sleeved on the outer side of the round rod (1101); two ends of the pushing spring (1104) are respectively connected to the first baffle (1102) and the inner wall of the mounting sleeve (701); and a scale line (1105) is provided on the round rod (1101) for identifying the distance that the round rod (1101) slides out on the mounting sleeve (701).

7. The quick-change vent plug for a drive axle according to claim 1, characterized in that: The control component comprises an operating chamber (201) opened inside the vent plug body (101); a connecting hole (202) is arranged between the operating chamber (201) and the outside of the vent plug body (101); a conical chamber (203) arranged in a conical shape is arranged between the connecting hole (202) and the operating chamber (201); a ball (204) for blocking the connecting hole (202) is arranged inside the conical chamber (203); and an elastic component for squeezing and pushing the ball (204) is arranged inside the operating chamber (201).

8. The quick-change vent plug for a drive axle according to claim 7, characterized in that: The elastic component comprises a circular plate (301) arranged inside the operating cavity (201), a first sleeve (302) being fixed on the circular plate (301), a first slide rod (303) being slidably connected to the first sleeve (302), one end of the first slide rod (303) being fixed to the sphere (204), an extrusion spring (304) being sleeved on the outer side of the first sleeve (302), two ends of the extrusion spring (304) being respectively arranged to abut against the circular plate (301) and the sphere (204), and a plurality of groups of circular holes (305) being provided on the circular plate (301).

9. The quick-change vent plug for a drive axle according to claim 8, characterized in that: The adjustment assembly comprises a threaded tube (401) rotatably connected to the upper end of the vent plug body (101); a threaded rod (402) is threadedly engaged with the threaded tube (401); one end of the threaded rod (402) is fixed to the circular plate (301); and a driving pin (403) for rotating the threaded tube (401) is fixed to the other end of the threaded tube (401).

10. The quick-change vent plug for a drive axle according to claim 9, characterized in that: The guide assembly comprises two groups of second sleeves (501) fixed inside the operating cavity (201), the two groups of second sleeves (501) are symmetrically arranged on both sides of the threaded tube (401), and a second sliding rod (502) is slidably connected to the second sleeve (501), and one end of the second sliding rod (502) is fixed to the circular plate (301).

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