End cover assembly with ventilation pin easy to replace and wheel tread sweeper applying end cover assembly

Abstract

The end cover assembly comprises a cylinder cover body and the ventilation pin, a mounting hole penetrating through the two axial end faces is formed in the cylinder cover body, the ventilation pin is inserted into one end of the mounting hole, and an elastic pull rod of a cylinder body assembly is inserted into the other end of the mounting hole. At least two ventilation holes penetrating through the two axial end faces of the ventilation pin are formed in the ventilation pin, or a ventilation hole penetrating through the two axial end faces of the ventilation pin and a blind hole with an opening facing the end, away from the cylinder body assembly, of the ventilation pin are formed in the ventilation pin. According to the end cover assembly with the ventilation pin easy to replace, when the ventilation pin is assembled or disassembled, a user only needs to hold tweezers by hand, and the two clamping arms of the tweezers are inserted into the two ventilation holes of the ventilation pin, or one clamping arm of the tweezers is inserted into one ventilation hole, and the other clamping arm of the tweezers is inserted into one blind hole; then the ventilation pin is clamped by a pair of tweezers and then is mounted in the mounting hole in the cylinder cover body or taken out from the mounting hole in the cylinder cover body, so that the operation is simple and convenient, and the assembly efficiency of the wheel tread sweeper can be greatly improved; the overall structural design is ingenious and reasonable, application and implementation feasibility is high, and practicability is high. According to the wheel tread sweeper, when the wheel tread sweeper is assembled or overhauled, the ventilation pin can be rapidly taken down or installed back through tweezers, and the assembling or overhauling efficiency of the wheel tread sweeper can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel tread cleaning devices for rail vehicles, and particularly relates to an end cover assembly with an easily replaceable ventilation pin and a wheel tread cleaner applying the same. Background Art

[0002] As an important walking component in the bogie of a rail vehicle, when the tread of the wheel shows phenomena such as out-of-roundness, abrasion, and low adhesion, it directly affects the running safety of the train. And as one of the standard configurations of the bogie of a rail vehicle, the tread cleaning device can clean the foreign matters attached to the wheel tread, realizing functions such as improving wheel-rail adhesion and wheel profile correction, thereby effectively improving the condition of the wheel tread, suppressing the out-of-roundness of the wheel tread, and preventing phenomena such as wheel slip and idle rotation, effectively improving the braking performance and comfort performance of the rail vehicle.

[0003] The wheel tread cleaning device mainly drives the grinding element to be close to the wheel tread through a driving mechanism to perform the wheel cleaning work. After the cleaning work is completed, the driving mechanism contracts and resets to make the grinding element leave the wheel tread to prevent the grinding element from affecting the normal operation of the wheel. At present, the driving mechanism adopted in the wheel tread cleaning device is usually a pneumatic device, and the grinding element is installed at the driving end of the pneumatic device. An end cover assembly needs to be provided at one end of such a pneumatic device far from the grinding element to provide the function of gas inlet and outlet. The Chinese utility model patent with the application number 201921882362.2 discloses an end cover assembly for a wheel tread cleaner, including: a cylinder head, which has an inner end face facing the cylinder and an outer end face facing away from the cylinder; a first external threaded column body extending and protruding is provided on the inner end face of the cylinder head, and it is installed in cooperation with the cylinder; and a second external threaded column body extending and protruding is provided on the outer end face of the cylinder head. The cylinder head has an installation hole extending through the first external threaded column body and the second external threaded column body, and an air core is inserted inside the installation hole. A through hole located on its central axis is provided on the air core for passing gas; and a gland, which has an inner end face facing the cylinder head and an outer end face facing away from the cylinder head; a threaded hole cooperating with the second external threaded column body is provided on the inner end face of the gland; and a throttle vent hole is provided between the threaded hole and the outer end face of the gland. The problem of this end cover assembly is that: since the air core is inserted inside the installation hole on the cylinder head, and one end of the air core facing the gland is recessed inside the installation hole, it is difficult to install or disassemble the air core inside the installation hole, seriously affecting the assembly or maintenance efficiency of the wheel tread cleaner. For this reason, the utility model proposes an end cover assembly with an easily replaceable ventilation pin and a wheel tread cleaner applying the same, in order to solve the above technical problems. Content of the Utility Model

[0004] The purpose of the present utility model is to overcome the defects existing in the prior art and provide an end cover assembly that is easy to replace the ventilation pin and a wheel tread cleaning device using the same. When installing or disassembling the ventilation pin, only need to hold a pair of tweezers, insert the two clamping arms of the tweezers into the two ventilation holes of the ventilation pin, or insert one clamping arm of the tweezers into one ventilation hole and the other clamping arm into one blind hole, and then clamp the ventilation pin with the tweezers and install it into the installation hole on the cylinder head body or take it out from the installation hole on the cylinder head body. The operation is simple, which helps to greatly improve the assembly efficiency of the wheel tread cleaning device; the overall structure is designed ingeniously and reasonably, with high feasibility of application and strong practicability.

[0005] One of the purposes of the present utility model is to design an end cover assembly that is easy to replace the ventilation pin, including a cylinder head body and a ventilation pin. The cylinder head body has an installation hole that penetrates through the axial two end faces. One end of the installation hole is inserted with a ventilation pin, and the other end is used to insert an elastic pull rod of the cylinder block assembly. The ventilation pin has at least two ventilation holes that penetrate through its axial two end faces, or the ventilation pin has a ventilation hole that penetrates through its axial two end faces and a blind hole with an opening facing away from the end of the cylinder block assembly.

[0006] For an end cover assembly of the present utility model that is easy to replace the ventilation pin, when installing or disassembling the ventilation pin, only need to hold a pair of tweezers, insert the two clamping arms of the tweezers into the two ventilation holes of the ventilation pin, or insert one clamping arm of the tweezers into one ventilation hole and the other clamping arm into one blind hole, and then clamp the ventilation pin with the tweezers and install it into the installation hole on the cylinder head body or take it out from the installation hole on the cylinder head body. The operation is simple, which helps to greatly improve the assembly efficiency of the wheel tread cleaning device; the overall structure is designed ingeniously and reasonably, with high feasibility of application and strong practicability.

[0007] The preferred technical solution is that a confluence groove is provided on the end face of the ventilation pin away from the cylinder block assembly, and the end of the ventilation hole away from the cylinder block assembly and the open end of the blind hole are both connected to the confluence groove in a penetrating manner. When the wheel tread cleaning device assembled with the end cover assembly of the present utility model cleans the wheel tread, the gas injected from the outside enters the inside of the cylinder block assembly through the confluence groove and the ventilation hole in sequence, thereby avoiding the adsorption blockage at the end of the ventilation hole on the ventilation pin away from the cylinder block assembly, ensuring the smoothness when injecting gas into the inside of the cylinder block assembly and the smoothness when the grinding sub-assembly on the tread cleaning device extends. Similarly, it also ensures the smoothness when the grinding sub-assembly contracts and resets.

[0008] A further preferred technical solution is that a first cylinder extends convexly from one side surface of the cylinder head body for cooperating with the cylinder block assembly, and a second cylinder extends convexly from the other side surface. A third cylinder extends convexly from one end surface of the first cylinder facing the cylinder block assembly. The mounting hole extends through the first cylinder, the second cylinder and the third cylinder. External thread structures are provided on the outer side surfaces of the first cylinder and the second cylinder. The first cylinder is screwed and installed on the cylinder block assembly to support one end of the cylinder liner facing the cylinder head body. The third cylinder is inserted and fitted with one end of the cylinder barrel located inside the supporting cylinder liner facing the cylinder head body. A gland is screwed and installed outside the second cylinder. An air hole communicating with the mounting hole is provided at one end of the gland away from the cylinder head body. The assembly method of the cylinder head body on the cylinder block assembly is simple, ensuring the smooth preparation and implementation of the wheel tread cleaning device assembled with the end cover assembly of the present utility model.

[0009] A further preferred technical solution is that an annular groove two close to the cylinder head body is provided on the outer side surface of the first cylinder, and a second sealing ring is embedded inside the annular groove two. An annular groove four surrounding the outer peripheral side of the second cylinder is provided on the outer peripheral edge of one side surface of the cylinder head body where the second cylinder is provided, and a fourth sealing ring is embedded inside the annular groove four. An annular groove three is provided on the outer peripheral side surface of the third cylinder, and a third sealing ring is embedded inside the annular groove three. In the assembled state, the supporting cylinder liner and the first cylinder are sealed by the second sealing ring, the gland and the cylinder head body are sealed by the fourth sealing ring, and the cylinder barrel and the third cylinder are sealed by the third sealing ring. Through the split structure and the sealing ring, on the one hand, a simple assembly process is provided, which helps to improve the assembly efficiency between the end cover assembly and the cylinder block assembly and reduce the assembly cost; on the other hand, better sealing performance than end face sealing is provided, making the output pressure of the assembled tread cleaning device stable and more conducive to the product performing its function; in addition, the installation position of the sealing ring avoids the threaded part for realizing the connection between the split mechanisms, so that the two do not conflict, taking into account the reliability of installation and sealing.

[0010] A further preferred technical solution is that the fourth sealing ring is an ED sealing ring. The ED sealing ring is an industrial seal. As a special seal for pneumatic and hydraulic joints such as pipe joints, hydraulic plugs, and transition joints, it has a better sealing effect than the traditional O-ring. It is used as an axial static seal and is applied to threaded oil ports and screw ends. Its cross-section remains almost constant under high pressure.

[0011] A further preferred technical solution is that a limiting step and an annular limiting groove for axially limiting the ventilation pin are provided inside the mounting hole in the second cylinder body. The end of the ventilation pin facing the cylinder block assembly is provided with a stepped structure adapted to the limiting step. When the ventilation pin is inserted into the mounting hole in the second cylinder body, the end with the stepped structure is embedded inside the limiting step, and the other end is limited by a limiting flap embedded inside the annular limiting groove. A simple and effective fixing method for the ventilation pin is provided, so that when the ventilation pin and the elastic pull rod jointly adjust the intake air flow and the exhaust air flow in the cylinder block assembly, it is more stable and reliable.

[0012] The second object of the present invention is to design a wheel tread cleaning device, including a cylinder block assembly, a grinding wheel sub-assembly is installed at one end of the cylinder block assembly, and an end cover sub-assembly is installed at the other end. The end cover sub-assembly is the above-mentioned end cover sub-assembly that is easy to replace the ventilation pin.

[0013] For the wheel tread cleaning device of the present invention, when assembling or overhauling, the ventilation pin can be quickly removed or installed back by tweezers, which helps to greatly improve the assembly or overhaul efficiency of the wheel tread cleaning device.

[0014] A preferred technical solution is also that the supporting cylinder sleeve on the cylinder block assembly includes a first supporting cylinder sleeve and a second supporting cylinder sleeve. The grinding wheel sub-assembly is installed at one end of the first supporting cylinder sleeve, and the other end of the first supporting cylinder sleeve is detachably fixedly connected to one end of the second supporting cylinder sleeve. The end cover sub-assembly is installed at the other end of the second supporting cylinder sleeve. For supporting cylinder sleeve assemblies of different length specifications, only the second supporting cylinder sleeve with the corresponding length needs to be processed, and then the second supporting cylinder sleeve is butt-joined and fixedly connected to the first supporting cylinder sleeve to form the supporting cylinder sleeve with the required length specification, thereby avoiding a large number of development of processing molds for different length models of supporting cylinder sleeves, helping to reduce the equipment investment cost, and having good economic benefits.

[0015] A further preferred technical solution is also that the second supporting cylinder sleeve has an external thread section one at one end and an internal thread section two at the other end. The end of the first supporting cylinder sleeve facing the second supporting cylinder sleeve is provided with an internal thread adapted to the external thread section one. The second supporting cylinder sleeve is fixedly installed on the end of the first supporting cylinder sleeve with the internal thread by screwing the external thread section one. The cylinder head body is screwed and installed on the internal thread section two of the second supporting cylinder sleeve through the first cylinder body;

[0016] An annular eaves body is provided on the outer peripheral side of the supporting cylinder sleeve and is located between the first external thread section and the second internal thread section. An annular groove one is provided on the outer peripheral side of the first external thread section and is close to the annular eaves body. A first sealing ring is embedded inside the annular groove one. In the assembled state, the first supporting cylinder sleeve and the first external thread section are sealed by the first sealing ring, and the annular eaves body abuts against the corresponding end face of the first supporting cylinder sleeve. The fixed connection method between the first supporting cylinder sleeve and the second supporting cylinder sleeve is simple. The annular eaves body plays a positioning role when the first supporting cylinder sleeve and the second supporting cylinder sleeve are assembled into a cylinder sleeve assembly, so that it can accurately judge whether the first supporting cylinder sleeve and the second supporting cylinder sleeve are assembled in place. The installation position of the first sealing ring avoids the connecting thread part between the first supporting cylinder sleeve and the first external thread section, so that the two will not conflict, taking into account both the installation firmness and the sealing reliability.

[0017] A further preferably technical solution is that a plurality of notch grooves are circumferentially spaced on the outer periphery of the annular eaves body. On one end of the first supporting cylinder sleeve facing the second supporting cylinder sleeve and the second supporting cylinder sleeve, ear blocks extending radially outward are provided. Binding holes are provided on the outer peripheries of the annular eaves body, the ear blocks and the cylinder head body. The cylinder head body, the first supporting cylinder sleeve and the second supporting cylinder sleeve are tied together by a rope passing through the binding holes. The notch grooves on the outer periphery of the annular eaves body improve the clamping convenience of the second supporting cylinder sleeve by using tools, which helps to improve the assembly or disassembly efficiency between the first supporting cylinder sleeve and the second supporting cylinder sleeve. The cylinder head body, the first supporting cylinder sleeve and the second supporting cylinder sleeve are tied together by a rope passing through the binding holes, thus avoiding relative rotational displacement among the three under severe vibration conditions and ensuring the assembly firmness between the cylinder head assembly and the cylinder block assembly.

[0018] The advantages and beneficial effects of the present utility model are as follows:

[0019] 1. For an end cap assembly of the present utility model that is easy to replace the vent pin, when installing or disassembling the vent pin, only need to hold a pair of tweezers, insert the two clamping arms of the tweezers into the two vent holes of the vent pin, or insert one clamping arm of the tweezers into one vent hole and the other clamping arm into one blind hole, and then clamp the vent pin with the tweezers and install it into the installation hole on the cylinder head body or take it out from the installation hole on the cylinder head body. The operation is simple, which helps to greatly improve the assembly efficiency of the wheel tread cleaner. The overall structure design is ingenious and reasonable, with high application feasibility and strong practicability.

[0020] 2. A confluence groove is provided on one end surface of the ventilation pin away from the cylinder block assembly. One end of the ventilation hole away from the cylinder block assembly and the opening end of the blind hole are both connected to the confluence groove in a through manner. When the wheel tread cleaner assembled with the end cover assembly of the present utility model cleans the wheel tread, the gas injected from the outside sequentially enters the inside of the cylinder block assembly through the return groove and the ventilation hole, thereby avoiding the adsorption blockage at one end of the ventilation hole on the ventilation pin away from the cylinder block assembly, ensuring the smoothness of injecting gas into the inside of the cylinder block assembly and the smoothness of the grinding sub-assembly extending on the tread cleaner. Similarly, the smoothness of the grinding sub-assembly contracting and resetting is also ensured.

[0021] 3. Through the split structure and the cooperation of the sealing ring, on the one hand, a simple assembly process is provided, which helps to improve the assembly efficiency between the end cover assembly and the cylinder block assembly and reduce the assembly cost; on the other hand, better sealing performance than end face sealing is provided, making the output pressure of the assembled tread cleaner stable and more conducive to the product performing its functions; in addition, the installation position of the sealing ring avoids the threaded part used to connect between the split mechanisms, so that the two will not conflict, taking into account the reliability of installation and sealing.

[0022] 4. The sealing ring IV is an ED sealing ring. The ED sealing ring is an industrial sealing part. As a special sealing part for pneumatic and hydraulic joints such as pipe joints, hydraulic plugs, and transition joints, it has a better sealing effect than the traditional O-ring. It is used as an axial static seal and is applied to threaded oil ports and screw ends. Its cross-section remains almost constant under high pressure.

[0023] 5. For a wheel tread cleaner of the present utility model, during assembly or maintenance, the ventilation pin can be quickly removed or reinstalled with tweezers, which helps to greatly improve the assembly or maintenance efficiency of the wheel tread cleaner.

[0024] 6. For support cylinder sleeve assemblies of different length specifications, only the support cylinder sleeve II with the corresponding length needs to be processed, and then the support cylinder sleeve II is butt-jointed and fixedly connected with the support cylinder sleeve I to form a support cylinder sleeve with the required length specification, thereby avoiding the development of a large number of processing molds for support cylinder sleeves of different length models, helping to reduce the equipment investment cost and having good economic benefits.

[0025] 7. The fixed connection method between the support cylinder sleeve I and the support cylinder sleeve II is simple. The annular eaves play a positioning role when the support cylinder sleeve I and the support cylinder sleeve II are assembled into a cylinder sleeve assembly, so that it can be accurately judged whether the support cylinder sleeve I and the support cylinder sleeve II are assembled in place; the installation position of the sealing ring I avoids the connection threaded part between the support cylinder sleeve I and the external thread section I, so that the two will not conflict, taking into account the installation firmness and sealing reliability.

[0026] 8. The notch groove on the outer periphery of the annular eaves improves the convenience of clamping the supporting cylinder sleeve II with tools, which helps to improve the assembly or disassembly efficiency between the supporting cylinder sleeve I and the supporting cylinder sleeve II. The cylinder head body, the supporting cylinder sleeve I and the supporting cylinder sleeve II are tied together by a rope passing through the inside of the binding hole, thereby avoiding relative rotational displacement among the three under severe vibration conditions and ensuring the firmness of the assembly between the cylinder head assembly and the cylinder block assembly. Brief Description of the Drawings

[0027] Figure 1 is a cross-sectional view of an end cap assembly that is easy to replace the vent pin in Example 1 along the center line of its mounting hole;

[0028] Figure 2 is a cross-sectional view of an end cap assembly that is easy to replace the vent pin in Example 2 along the center line of its mounting hole;

[0029] Figure 3 is a perspective view of the left front side of a wheel tread cleaner in Example 3 (the rope is hidden);

[0030] Figure 4 is a perspective view of the right rear side of a wheel tread cleaner in Example 3 (the rope is hidden);

[0031] Figure 5 is a right end view of a wheel tread cleaner in Example 3 (the rope is hidden);

[0032] Figure 6 is Figure 5 a partial enlarged view at H in

[0033] Figure 7 is a partial cross-sectional view of a tread cleaner at the positions of the end cap assembly and the supporting cylinder sleeve II in Example 3.

[0034] In the figure: I. Cylinder block assembly; II. End cap assembly; III. Polishing sub-assembly; 1. Supporting cylinder sleeve I; 2. Supporting cylinder sleeve II; 3. Elastic tension rod; 4. Cylinder head body; 5. Vent pin; 6. Cylinder barrel; 7. Limit stop; 2-1. First external thread segment; 2-2. Second internal thread segment; 2-3. Annular eaves; 2-3a. Notch groove; 4-1. First column; 4-2. Second column; 4-3. Third column; 4-4. Mounting hole; 5-1. Vent hole; 5-2. Blind hole; 5-3. Limit step; 5-4. Confluence groove; A. Ear block; B. Binding hole; C. First sealing ring; D. Second sealing ring; E. Third sealing ring; F. Fourth sealing ring. Detailed Description of the Embodiment

[0035] The following further describes the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, and shall not be used to limit the protection scope of the present utility model.

[0036] Embodiment 1

[0037] As Figure 1 shown, an end cap assembly that is easy to replace the ventilation pin includes a cylinder head body 4 and a ventilation pin 5. The cylinder head body 4 has an installation hole 4-4 that penetrates through the axial end faces at both ends. One end of the installation hole 4-4 is inserted with a ventilation pin 5, and the other end is used to insert an elastic pull rod 3 of the cylinder block assembly I. The ventilation pin 5 has at least two ventilation holes 5-1 that penetrate through its axial end faces.

[0038] Preferably, a confluence groove 5-4 is provided on one end face of the ventilation pin 5 away from the cylinder block assembly I, and one end of the ventilation hole 5-1 away from the cylinder block assembly I is in through connection with the confluence groove 5-4.

[0039] Further preferably, a cylinder one 4-1 for cooperating with the cylinder block assembly I protrudes from one side face of the cylinder head body 4, and a cylinder two 4-2 protrudes from the other side face. A cylinder three 4-3 also protrudes from one end face of the cylinder one 4-1 facing the cylinder block assembly I. The installation hole 4-4 extends through the cylinder one 4-1, the cylinder two 4-2, and the cylinder three 4-3. External thread structures are provided on the outer side faces of the cylinder one 4-1 and the cylinder two 4-2. The cylinder one 4-1 is screwed and installed on the cylinder block assembly I to support one end of the cylinder liner facing the cylinder head body 4. The cylinder three 4-3 is inserted and fitted with one end of the cylinder barrel 6 located inside the support cylinder liner facing the cylinder head body 4. A gland is screwed and installed outside the cylinder two 4-2, and an air hole that is in through connection with the installation hole 4-4 is provided at one end of the gland away from the cylinder head body 4.

[0040] Further preferably, an annular groove two is provided on the outer side face of the cylinder one 4-1 near the cylinder head body 4, and a seal ring two D is installed inside the annular groove two. An annular groove four that surrounds the outer peripheral side of the cylinder two 4-2 is provided on the outer peripheral edge of one side face of the cylinder head body 4 where the cylinder two 4-2 is provided, and a seal ring four F is installed inside the annular groove four. An annular groove three is provided on the outer peripheral side face of the cylinder three 4-3, and a seal ring three E is installed inside the annular groove three. In the assembled state, the support cylinder liner and the cylinder one 4-1 are sealed by the seal ring two D, the gland and the cylinder head body 4 are sealed by the seal ring four F, and the cylinder barrel 6 and the cylinder three 4-3 are sealed by the seal ring three E.

[0041] Further preferably, the seal ring four F is an ED seal ring.

[0042] Further preferably, a limiting step 5-3 and an annular limiting groove for axially limiting the ventilation pin 5 are provided inside the mounting hole 4-4 located inside the second cylinder 4-2. One end of the ventilation pin 5 facing the cylinder block assembly I is provided with a stepped structure adapted to the limiting step 5-3. When the ventilation pin 5 is inserted into the mounting hole 4-4 located inside the second cylinder 4-2, the end with the stepped structure is embedded inside the limiting step 5-3, and the other end is limited by a limiting tab 7 embedded inside the annular limiting groove.

[0043] Embodiment 2

[0044] As Figure 2 shown, an end cover assembly with an easily replaceable ventilation pin, which is different from the end cover assembly in Embodiment 1 in that: the ventilation pin 5 has a ventilation hole 5-1 penetrating through its two axial end faces and a blind hole 5-2 with an opening facing the end away from the cylinder block assembly I.

[0045] Further preferably, a confluence groove 5-4 is provided on the end face of the ventilation pin 5 away from the cylinder block assembly I. The end of the ventilation hole 5-1 away from the cylinder block assembly I and the open end of the blind hole 5-2 are both connected to the confluence groove 5-4 in a penetrating manner.

[0046] For an end cover assembly with an easily replaceable ventilation pin of the present utility model, when installing or disassembling the ventilation pin, only need to hold a pair of tweezers, insert the two clamping arms of the tweezers into the two ventilation holes of the ventilation pin, or insert one clamping arm of the tweezers into one ventilation hole and the other clamping arm into one blind hole, and then clamp the ventilation pin with the tweezers and install it into the mounting hole on the cylinder head body or take it out from the mounting hole on the cylinder head body. The operation is simple, which helps to greatly improve the assembly or maintenance efficiency of the wheel tread cleaner; the overall structural design is ingenious and reasonable, with high application feasibility and strong practicability.

[0047] Embodiment 3

[0048] As Figures 3 to 7 shown, a wheel tread cleaner includes a cylinder block assembly I. One end of the cylinder block assembly I is installed with a grinding wheel sub-assembly III, and the other end is installed with an end cover assembly II. The end cover assembly II is the end cover assembly with an easily replaceable ventilation pin described in the above Embodiment 1 or Embodiment 2.

[0049] Preferably, the supporting cylinder sleeves on the cylinder block assembly I include a first supporting cylinder sleeve 1 and a second supporting cylinder sleeve 2. The grinding wheel sub-assembly III is installed at one end of the first supporting cylinder sleeve 1. The other end of the first supporting cylinder sleeve 1 is detachably and fixedly connected to one end of the second supporting cylinder sleeve 2. The end cover assembly II is installed at the other end of the second supporting cylinder sleeve 2.

[0050] Further preferably, the second supporting cylinder sleeve 2 has an external thread section 2-1 at one end and an internal thread section 2-2 at the other end. One end of the first supporting cylinder sleeve 1 facing the second supporting cylinder sleeve 2 is provided with an internal thread adapted to the external thread section 2-1. The second supporting cylinder sleeve 2 is fixedly installed on the end of the first supporting cylinder sleeve 1 with internal thread by screwing through the external thread section 2-1. The cylinder head body 4 is screwed and installed on the internal thread section 2-2 of the second supporting cylinder sleeve 2 through the first column 4-1;

[0051] The outer peripheral side of the supporting cylinder sleeve is provided with an annular eaves 2-3 between the external thread section 2-1 and the internal thread section 2-2. The outer peripheral side of the external thread section 2-1 is provided with an annular groove 1 near the annular eaves 2-3. An O-ring C is embedded in the annular groove 1. In the assembled state, the first supporting cylinder sleeve 1 and the external thread section 2-1 are sealed via the O-ring C, and the annular eaves 2-3 abuts against the corresponding end face of the first supporting cylinder sleeve 1.

[0052] Further preferably, a plurality of notch grooves 2-3a are circumferentially spaced on the outer peripheral edge of the annular eaves 2-3. On one end of the first supporting cylinder sleeve 1 facing the second supporting cylinder sleeve 2 and on the second supporting cylinder sleeve 2, there are both ear blocks A extending radially outward. Binding holes B are provided on the outer peripheral edges of the annular eaves 2-3, the ear blocks A, and the cylinder head body 4. The cylinder head body 4, the first supporting cylinder sleeve 1, and the second supporting cylinder sleeve 2 are tied together by a rope passing through the binding holes B.

[0053] For a wheel tread cleaning device of the present utility model, during assembly or maintenance, the ventilation pin can be quickly removed or reinstalled by tweezers, which helps to greatly improve the assembly or maintenance efficiency of the wheel tread cleaning device.

[0054] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. An end cap assembly with an easily replaceable vent pin, characterized in that: The invention comprises a cylinder head body (4) and a vent pin (5), wherein the cylinder head body (4) has a mounting hole (4-4) extending through both axial ends, one end of the mounting hole (4-4) is provided with a vent pin (5), and the other end is used to insert an elastic pull rod (3) of a cylinder assembly (Ⅰ), and the vent pin (5) has at least two vent holes (5-1) extending through both axial ends, or the vent pin (5) has a vent hole (5-1) extending through both axial ends and a blind hole (5-2) opening toward one end thereof away from the cylinder assembly (Ⅰ).

2. The end cap assembly for easily replacing a vent pin according to claim 1, wherein: A confluence groove (5-4) is provided on the end surface of the vent pin (5) away from the cylinder assembly (I), and the end of the vent hole (5-1) away from the cylinder assembly (I) and the open end of the blind hole (5-2) are both connected to the confluence groove (5-4).

3. The end cap assembly for easily replacing a vent pin according to claim 2, wherein: The cylinder head body (4) has a protruding column 1 (4-1) extending from one side thereof for cooperating with the cylinder assembly (I), and a protruding column 2 (4-2) extending from the other side thereof. The column 1 (4-1) is further provided with a protruding column 3 (4-3) on one end face thereof facing the cylinder assembly (I). The mounting hole (4-4) extends through the column 1 (4-1), the column 2 (4-2) and the column 3 (4-3). The outer side of the column 1 (4-1) and the column The outer side surfaces of the two (4-2) are both provided with external thread structures. The first column (4-1) is screwed and installed on the cylinder assembly (Ⅰ) to support the end of the cylinder sleeve facing the cylinder head body (4). The third column (4-3) is plugged and matched with the end of the cylinder barrel (6) located inside the supporting cylinder sleeve facing the cylinder head body (4). The second column (4-2) is screwed and installed with a pressure cover on the outside. The end of the pressure cover away from the cylinder head body (4) is provided with an air hole that is connected to the installation hole (4-4).

4. The end cap assembly for easily replacing a vent pin according to claim 3, wherein: The outer side surface of the column one (4-1) is provided with an annular groove two close to the cylinder head body (4), and a sealing ring two (D) is embedded in the annular groove two. The outer peripheral edge of one side surface of the column two (4-2) is provided on the cylinder head body (4) with an annular groove four surrounding the outer peripheral side of the column two (4-2), and a sealing ring four (F) is embedded in the annular groove four. The outer peripheral side surface of the column three (4-3) is provided with an annular groove three, and a sealing ring three (E) is embedded in the annular groove three. In the assembled state, the supporting cylinder sleeve and the column one (4-1) are sealed via the sealing ring two (D), the pressure cover and the cylinder head body (4) are sealed via the sealing ring four (F), and the cylinder barrel (6) and the column three (4-3) are sealed via the sealing ring three (E).

5. The end cap assembly for easily replacing a vent pin according to claim 4, wherein: The sealing ring four (F) is an ED sealing ring.

6. The end cap assembly for easily replacing a vent pin according to claim 5, wherein: A limiting step (5-3) and an annular limiting groove for axially limiting the vent pin (5) are provided inside the mounting hole (4-4) located in the second column (4-2). One end of the vent pin (5) facing the cylinder assembly (I) is provided with a step-shaped structure adapted to the limiting step (5-3). When the vent pin (5) is inserted into the mounting hole (4-4) located in the second column (4-2), one end with the step-shaped structure is embedded in the limiting step (5-3), and the other end is limited by a limiting block piece (7) embedded in the annular limiting groove.

7. A wheel tread cleaner, comprising a cylinder assembly (I), wherein one end of the cylinder assembly (I) is mounted with a grinding subassembly (III) and the other end is mounted with an end cover assembly (II), characterized in that: The end cover assembly (II) is the end cover assembly with easy-to-replace ventilation pin as described in claim 6 above.

8. The wheel tread cleaner according to claim 7, characterized in that: The supporting cylinder sleeve on the cylinder assembly (I) includes a supporting cylinder sleeve 1 (1) and a supporting cylinder sleeve 2 (2), the grinding subassembly (III) is installed at one end of the supporting cylinder sleeve 1 (1), the other end of the supporting cylinder sleeve 1 (1) is detachably fixedly connected to one end of the supporting cylinder sleeve 2 (2), and the end cover assembly (II) is installed at the other end of the supporting cylinder sleeve 2 (2).

9. The wheel tread cleaner according to claim 8, characterized in that: The supporting cylinder sleeve 2 (2) has an external thread section 1 (2-1) located at one end and an internal thread section 2 (2-2) located at the other end. The supporting cylinder sleeve 1 (1) is provided with an internal thread that matches the external thread section 1 (2-1) at one end facing the supporting cylinder sleeve 2 (2). The supporting cylinder sleeve 2 (2) is fixedly mounted on the end of the supporting cylinder sleeve 1 (1) provided with the internal thread by screwing the external thread section 1 (2-1). The cylinder cover body (4) is screwed on the internal thread section 2 (2-2) of the supporting cylinder sleeve 2 (2) by screwing the column 1 (4-1). The outer peripheral side surface of the supporting cylinder sleeve is provided with an annular eaves (2-3) located between the external thread section 1 (2-1) and the internal thread section 2 (2-2); the outer peripheral side surface of the external thread section 1 (2-1) is provided with an annular groove 1 close to the annular eaves (2-3); a sealing ring 1 (C) is embedded in the annular groove 1; in the assembled state, the supporting cylinder sleeve 1 (1) and the external thread section 1 (2-1) are sealed via the sealing ring 1 (C), and the annular eaves (2-3) abuts against the corresponding end surface of the supporting cylinder sleeve 1 (1).

10. The wheel tread cleaner according to claim 9, wherein A plurality of notched grooves (2-3a) are provided at intervals on the outer periphery of the annular eaves (2-3); an end of the supporting cylinder sleeve 1 (1) facing the supporting cylinder sleeve 2 (2) and the supporting cylinder sleeve 2 (2) are provided with an ear block (A) extending radially outward; the outer peripheries of the annular eaves (2-3), the ear block (A) and the cylinder cover body (4) are provided with a binding hole (B); the cylinder cover body (4), the supporting cylinder sleeve 1 (1) and the supporting cylinder sleeve 2 (2) are bound together by a rope passing through the binding hole (B).

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