The tamping device lubrication and sealing structure and tamping device

Abstract

This invention relates to the field of railway construction technology, specifically to a lubrication and sealing structure for a tamping device and a tamping device itself. The lubrication and sealing structure includes a housing, a pick arm, a pin sleeve, a bushing, a pick arm pin, and a radial seal. The pick arm pin passes through the pick arm and the housing, allowing for a hinged connection. The inner hole of the pin sleeve is interference-fitted with the outer circumferential surface of the pick arm pin. The bushing is fitted onto the outer circumferential surface of the pin sleeve and interference-fitted with the inner hole of the housing. The radial seal is embedded in an annular groove formed by the outer circumferential surface of the pin sleeve and the inner circumferential surface of the bushing. The bushing, pin sleeve, and radial seal together form a first lubrication and sealing structure and together form an annular oil cavity for storing lubricating oil. This lubrication and sealing structure provides a sealing structure with better lubrication performance; it also provides a sealing structure that is more reliable in lubrication and sealing, easier to manufacture and assemble, while reducing the difficulty of processing and assembly.

Description

Technical Field

[0001] This invention relates to the field of railway construction technology, and more specifically, to a lubrication and sealing structure for a tamping device and a tamping device. Background Technology

[0002] The tamping arm sealing structure is a key structure on the tamping device. It mainly stores lubricating oil inside the sealing structure and provides lubrication to the hinge points of the tamping arm and the box body during the operation of the tamping device, preventing the lubricating oil from leaking out.

[0003] However, the sealing structure of the tamping device's pick arm is simple. In actual use, oil leakage often occurs at the hinge joint of the pick arm housing. If the operation time is long and the oil leakage is not detected in time, insufficient lubrication can easily occur, leading to excessively high temperature at the hinge joint, causing malfunctions and affecting the service life of the tamping device. Summary of the Invention

[0004] The present invention aims to provide, for example, a lubrication and sealing structure for a tamping device and a tamping device that can provide a double seal, thereby improving the oil leakage problem of prior art tamping devices.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a lubrication and sealing structure for a tamping device, comprising:

[0007] Housing, pick arm, pin sleeve, bushing, pick arm pin, and radial seal;

[0008] The pick arm pin passes through the pick arm and the housing to make the pick arm and the housing hinged together. The inner hole of the pin sleeve is interference-fitted with the outer circumferential surface of the pick arm pin. The bushing is sleeved on the outer circumferential surface of the pin sleeve and interference-fitted with the inner hole of the housing. The radial seal is embedded in the annular groove formed by the outer circumferential surface of the pin sleeve and the inner circumferential surface of the bushing. The bushing, the pin sleeve and the radial seal together form a first lubrication sealing structure and together form an annular oil cavity for storing lubricating oil.

[0009] The inventors discovered that in the prior art, only an axial sealing structure is provided between the pin sleeve and the bushing, which results in poor sealing effect in the radial direction of the bushing and easy oil leakage. This leads to insufficient lubrication between the pin sleeve and the bushing, or even seizing.

[0010] To address the aforementioned issues, the tamping device in this solution incorporates a radial seal within its lubrication and sealing structure. This radial seal is positioned within an annular groove formed by the outer circumferential surface of the pin sleeve and the inner circumferential surface of the bushing. This arrangement, along with the bushing, pin sleeve, and radial seal, creates a first lubrication and sealing structure. This first lubrication and sealing structure provides a superior radial seal between the bushing and pin sleeve, thereby improving the existing technology's problem of oil leakage in the radial direction of the bushing.

[0011] Furthermore, the bushing, pin, and radial seal together form an annular oil cavity for storing lubricating oil. The lubricating oil is stored in this annular oil cavity. Because the first sliding seal structure can form a sealing effect at the hinge, the lubricating oil in the annular oil cavity will not leak and will provide sufficient lubrication between the pin and the bushing, thereby improving the technical problem of the pin and bushing seizing in the prior art.

[0012] Furthermore, the first lubrication sealing structure and the annular oil cavity work together to ensure sealing function; at the same time, compared with the existing technology where the distance between the sealing lubrication structure and the hinge center is relatively far, resulting in poor lubrication effect, the distance between the first lubrication sealing structure and the hinge center in this solution is closer, thus the lubrication effect is better.

[0013] In summary, the lubrication and sealing structure of the tamping device in this solution is characterized by its simple structure and convenient installation. By setting radial sealing elements, it significantly improves the technical problem of poor sealing effect between bushing and pin sleeve in the prior art, especially the poor sealing effect of bushing in the radial direction.

[0014] In an optional embodiment, the radial seal has an annular cavity, the opening of which faces the inner end face of the bushing and is jointly closed by the inner end face of the bushing and the outer peripheral surface of the pin sleeve to form the annular oil cavity.

[0015] In an optional embodiment, the end of the bushing extends radially and axially in sequence to form a stepped boss, the stepped boss and the outer peripheral surface of the pin sleeve forming the annular groove, the opening of the annular groove facing the outside of the housing.

[0016] The inner circumferential surface of the box is recessed at the end to form a stop, which engages with the stepped boss.

[0017] In an optional embodiment, the stepped boss includes a connected radial extension and an axial extension, one end of the radial extension away from the axial extension being connected to the end of the bushing, and the other end of the axial extension away from the radial extension extending beyond the end face of the housing.

[0018] In an optional embodiment, the outer end face of the axial extension is coated with grease.

[0019] In an optional embodiment, a pressure plate and an axial seal are also included, located between the housing and the pick arm mounting portion. The pressure plate is sleeved on the end face of the pick arm pin away from the housing to abut against the mounting portion of the pick arm. The axial seal is installed on the outer peripheral surface of the axial extension portion, with one end abutting against the end face of the housing and the other end abutting against the end face of the pressure plate near the housing.

[0020] In an optional embodiment, the pressure plate includes a connected plate body and an annular portion, the inner edge of the plate body is fitted onto the pick arm pin, the outer edge of the plate body extends axially to form the annular portion, the axial seal is at least partially located within the area enclosed by the annular portion, and the end of the axial seal away from the housing abuts against the end face of the plate body.

[0021] In an optional embodiment, the mounting portion of the pick arm is sleeved on the pick arm pin, and the mounting portion is used to abut against the pressure plate so that the pressure plate simultaneously presses against the pin sleeve and the axial seal, thereby forming a second lubrication and sealing structure together with the bushing, the pressure plate, the axial seal, the radial seal and the pin sleeve.

[0022] The second lubrication and sealing structure can achieve axial sealing. Furthermore, the second lubrication and sealing structure can also use a different lubricant than the first lubrication and sealing structure to ensure the sealing effect of the hinged parts, such as using grease lubrication.

[0023] In an optional embodiment, there are two pressure plates, two axial seals, and two mounting parts. The two pressure plates are respectively fitted onto the pick arm pin, and the two axial seals are respectively fitted onto the outer circumferential surfaces of the two bushings. One end of each of the two axial seals abuts against the housing, and the other end abuts against the two pressure plates. The two mounting parts are respectively fitted onto the pick arm pin to abut against the two pressure plates, so that the two pressure plates respectively press against both ends of the pin sleeve and respectively press against the two axial seals, thereby forming two second lubrication and sealing structures together with the pin sleeve, the two bushings, the two pressure plates, the two axial seals, and the two radial seals.

[0024] In an optional embodiment, the inner circumferential surface of the radial seal is fitted with the pin sleeve, and the outer circumferential surface of the radial seal is fitted with the inner circumferential surface of the stepped boss.

[0025] In an optional embodiment, the housing is provided with an oil inlet and an oil inlet channel connected in sequence, and the bushing is provided with an oil groove. The oil groove is located on the inner circumferential surface of the bushing hole and one end is connected to the annular oil cavity, and the other end is connected to the end of the oil inlet channel away from the oil inlet.

[0026] In an optional embodiment, the radial seal is a skeleton oil seal. The radial seal has an inner circumferential surface and an outer circumferential surface, the inner circumferential surface of which fits against the outer circumferential surface of the pin sleeve, and the outer circumferential surface of which fits against the inner circumferential surface of the bushing.

[0027] In an optional embodiment, there are two bushings and two radial seals. The two bushings are respectively fitted onto the outer circumferential surface of the pin sleeve and are respectively interference-fitted with both ends of the inner hole of the housing. The two bushings are arranged at intervals to form an oil passage for the lubricating oil to pass through. The two ends of the outer circumferential surface of the pin sleeve and the two bushings respectively form the annular groove. The two radial seals are respectively embedded in the two annular grooves. The pin sleeve, the two bushings and the two radial seals together form two first lubrication sealing structures and together form two annular oil cavities. One annular oil cavity is formed by the pin sleeve, one bushing and one radial seal, and the other annular oil cavity is formed by the pin sleeve, another bushing and another radial seal.

[0028] In an optional embodiment, the bushing is a copper bushing.

[0029] Secondly, the present invention provides a tamping device, the tamping device comprising the tamping device lubrication and sealing structure described in any of the foregoing embodiments.

[0030] The beneficial effects of the embodiments of the present invention include, for example:

[0031] The tamping device lubrication and sealing structure of this solution includes a housing, a pick arm, a pin sleeve, a bushing, a pick arm pin, and a radial seal. The radial seal is positioned within an annular groove formed by the outer circumferential surface of the pin sleeve and the inner circumferential surface of the bushing, so that the bushing, pin sleeve, and radial seal together form a first lubrication and sealing structure. This first lubrication and sealing structure ensures a good radial seal between the bushing and the pin sleeve, thus improving the technical problem of oil leakage in the radial direction of the bushing in existing technologies.

[0032] On the other hand, the bushing, pin, and radial seal together form an annular oil cavity for storing lubricating oil. The excellent sealing effect of the first sliding seal structure ensures that the lubricating oil in the annular oil cavity will not leak, thus ensuring sufficient lubrication between the pin and bushing, and preventing the technical problem of the pin and bushing seizing. This ensures the flexible rotation between the pick arm and the pick arm pin and the smooth operation of the tamping device.

[0033] Meanwhile, the first and second lubrication sealing structures are nested together, making the sealing and lubrication more reliable, and also reducing the machining precision of the pressure plate, which facilitates assembly. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the lubrication and sealing structure of the tamping device according to an embodiment of the present invention;

[0036] Figure 2 This is a partial schematic diagram of the lubrication and sealing structure of the tamping device according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the box structure of the lubrication and sealing structure of the tamping device according to an embodiment of the present invention

[0038] Figure 4 This is a schematic diagram of the bushing structure of the lubrication and sealing structure of the tamping device according to an embodiment of the present

[0039] Icons: 10-Tamming device lubrication and sealing structure; 11-First lubrication and sealing structure; 11a-Annular oil cavity; 12-Second lubrication and sealing structure; 100-Box body; 101-Stop; 102-Oil inlet; 103-Oil inlet channel; 200-Horn arm; 210-Mounting part; 300-Pin sleeve; 400-Bushing; 401-Annular groove; 402-Oil groove; 410-Stepped boss; 410a-Inner circumferential surface of stepped boss; 411-Radial extension; 412-Axial extension; 412a-Outer end face of axial extension; 500-Horn arm pin; 600-Radial seal; 600a-Inner circumferential surface of radial seal; 600b-Outer circumferential surface of radial seal; 700-Pressure plate; 710-Plate body; 720-Annular part; 800-Axial seal. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0046] The tamping arm sealing structure is a key structure on the tamping device. It mainly stores lubricating oil inside the sealing structure and provides lubrication to the hinge points of the tamping arm and the box body during the operation of the tamping device, preventing the lubricating oil from leaking out.

[0047] However, the sealing structure of the tamping device's pick arm is simple. In actual use, oil leakage often occurs at the hinge joint of the pick arm housing. If the operation time is long and the oil leakage is not detected in time, insufficient lubrication can easily occur, leading to excessively high temperature at the hinge joint, causing malfunctions and affecting the service life of the tamping device.

[0048] Specifically, the inventors discovered that in the prior art, there is only axial sealing between the pin sleeve and the bushing. This results in high positional tolerance requirements for the components and strict requirements for assembly precision. Furthermore, it is difficult to ensure the perpendicularity of the bearing plate to the bushing axis, which leads to poor sealing effect in the radial direction of the bushing and easy oil leakage. Consequently, the pin sleeve and the bushing cannot be adequately lubricated, or even seizing occurs.

[0049] To improve the above-mentioned technical problems, a lubrication and sealing structure for a tamping device and a tamping device are provided in the following embodiments.

[0050] Figure 1This is a schematic diagram of the lubrication and sealing structure 10 of the tamping device in this embodiment. Figure 2 for Figure 1 A partial schematic diagram of the lubrication and sealing structure 10 of the tamping device. Figure 3 for Figure 1 A schematic diagram of the structure of the box 100. Figure 4 for Figure 1 A schematic diagram of the structure of bushing 400.

[0051] Please refer to Figure 1 and Figure 2 This embodiment provides a lubrication and sealing structure 10 for a tamping device, comprising:

[0052] Box body 100, pick arm 200, pin sleeve 300, bushing 400, pick arm pin 500 and radial seal 600;

[0053] The pick arm pin 500 passes through the pick arm 200 and the housing 100 so that the pick arm 200 and the housing 100 are hinged together. The inner hole of the pin sleeve 300 is interference-fitted to the outer peripheral surface of the pick arm pin 500. The bushing 400 is sleeved on the outer peripheral surface of the pin sleeve 300 and interference-fitted to the inner hole of the housing 100. The radial seal 600 is embedded in the annular groove 401 formed by the outer peripheral surface of the pin sleeve 300 and the inner peripheral surface of the bushing 400. The bushing 400, the pin sleeve 300 and the radial seal 600 together form the first lubrication sealing structure 11 and together form an annular oil cavity 11a for storing lubricating oil.

[0054] It should be noted that the radial seal 600 enables the bushing 400, the pin sleeve 300, and the radial seal 600 to jointly form the first lubrication sealing structure 11. The first lubrication sealing structure 11 provides both radial and axial sealing, which improves the poor sealing effect between the bushing 400 and the pin sleeve 300 in the prior art, especially the poor radial sealing effect of the bushing 400.

[0055] Meanwhile, due to the double sealing effect of the first sliding seal structure, the lubricating oil in the annular oil cavity 11a will not leak and will provide sufficient lubrication between the pin sleeve 300 and the bushing 400, thereby improving the technical problem of the pin sleeve 300 and the bushing 400 seizing in the prior art. This ensures the flexible rotation between the pick arm 200 and the pick arm pin and the smooth operation of the tamping device.

[0056] It should also be noted that, compared to existing technologies, the distance between the sealing and lubrication structure and the hinge center is relatively large, resulting in poor lubrication performance;

[0057] The first lubrication sealing structure is closer to the center of the hinge, and the coordinated operation of the first lubrication sealing structure and the annular oil cavity ensures the sealing function at the hinge, thereby better sealing the lubricant and achieving better lubrication performance. Please continue reading. Figures 1 to 4 To learn more about the structural details of the lubrication and sealing structure 10 of the tamping device.

[0058] from Figure 1 , Figure 2 and Figure 3 As can be seen from this embodiment of the invention, the radial seal 600 has an annular cavity, the opening of which faces the inner end face of the bushing 400 and is jointly closed by the inner end face of the bushing 400 and the outer peripheral surface of the pin sleeve 300 to form an annular oil cavity 11a.

[0059] Optionally, the radial seal 600 is a skeleton oil seal.

[0060] Please see Figure 1 In this embodiment of the invention, there are two bushings 400 and two radial seals 600. The two bushings 400 are respectively fitted onto the outer peripheral surface of the pin sleeve 300 and are respectively interference-fitted with the two ends of the inner hole of the housing 100. The two bushings 400 are arranged at intervals to form an oil passage for lubricating oil to pass through.

[0061] The two ends of the outer peripheral surface of the pin sleeve 300 form annular grooves 401 with the two bushings 400 respectively, and the two radial seals 600 are respectively embedded in the two annular grooves 401. The pin sleeve 300, the two bushings 400 and the two radial seals 600 together form two first lubrication sealing structures 11 and together form two annular oil chambers 11a. One annular oil chamber 11a is formed by the pin sleeve 300, one bushing 400 and one radial seal 600, and the other annular oil chamber 11a is formed by the pin sleeve 300, another bushing 400 and another radial seal 600.

[0062] Optionally, bushing 400 can be made of copper. Copper bushings are characterized by good wear resistance and long service life.

[0063] Please continue reading. Figures 1 to 3 As can be seen from the figure, in this embodiment of the present invention, the housing 100 is provided with an oil inlet 102 and an oil inlet channel 103 connected in sequence, and the bushing 400 is provided with an oil groove 402. The oil groove 402 is located on the inner circumferential surface of the hole of the bushing 400 and one end is connected to the annular oil cavity 11a, and the other end is connected to the end of the oil inlet channel 103 away from the oil inlet 102.

[0064] The cooperation between the oil inlet 102, the oil inlet and the channel oil groove 402 can ensure the lubrication effect between the inner circumferential surface of the bushing 400 and the outer circumferential surface of the pin sleeve 300.

[0065] Please continue reading. Figures 1 to 3As can be seen from the figure, in this embodiment, the end of the bushing 400 extends radially and axially in sequence to form a stepped boss 410. The stepped boss 410 and the outer peripheral surface of the pin sleeve 300 form an annular groove 401. The opening of the annular groove 401 faces the outside of the housing 100. The end of the inner peripheral surface of the housing 100 is recessed to form a stop 101, which cooperates with the stepped boss 410.

[0066] It is easy to understand that the stepped boss 410 can ensure a stable connection between the bushing 400 and the housing 100, and prevent misalignment between the bushing 400 and the housing 100 in the axial and radial directions of the housing 100, which would affect the sealing effect at the bushing 400.

[0067] Furthermore, in this embodiment, the inner circumferential surface 600a of the radial seal is fitted with the pin sleeve 300 (during installation, the outer circumferential surface and the bushing are interference-fitted, and the inner circumferential surface is elastically fitted relative to the pin sleeve; during operation, the inner circumferential surface is a rotational seal relative to the pin sleeve, and the outer circumferential surface and the bushing may also rotate to some extent), and the outer circumferential surface 600b of the radial seal is fitted with the inner circumferential surface 410a of the stepped boss. This ensures the sealing effect between the radial seal 600 and the pin sleeve 300.

[0068] Please see Figures 1 to 4 As can be seen from the figure, in this embodiment of the present invention, the stepped boss 410 includes a connected radial extension 411 and an axial extension 412. The end of the radial extension 411 away from the axial extension 412 is connected to the end of the bushing 400, and the end of the axial extension 412 away from the radial extension 411 extends beyond the end face of the housing 100.

[0069] Specifically, the radial extension 411 ensures the relative position between the bushing 400 and the housing 100 along the axial direction of the housing 100, preventing the bushing 400 from shifting along the axial direction of the housing 100. The radial extension 411 also ensures the relative position between the bushing 400 and the housing 100 along the axial direction of the housing 100, preventing the bushing 400 from shifting along the radial direction of the housing 100.

[0070] As can also be seen from the figure, in this embodiment of the present invention, the tamping device lubrication and sealing structure 10 further includes a pressure plate 700 and an axial seal 800, located between the housing 100 and the mounting portion 210 of the pick arm 200. The pressure plate 700 is sleeved on the end face of the pick arm pin 500 away from the housing 100 to support the pick arm 200. The axial seal 800 is installed on the outer peripheral surface of the axial extension portion 412, with one end abutting against the end face of the housing 100 and the other end abutting against the end face of the pressure plate 700 near the housing 100.

[0071] There is a small gap between the outer end 412a of the axial extension 412 and the end face of the pressure plate 700 near the housing, and it is coated with grease. This is mainly to prevent wear between the pressure plate and the bushing when the structure deforms, and mainly serves a lubricating function. The pressure plate only abuts against the end face of the pin sleeve in its middle part, and the pressure plate abuts against the axial seal at its edge.

[0072] The axial seal 800 and the radial seal 600 work together to ensure that the bushing 400 can achieve a good sealing effect in both the axial and radial directions, further ensuring the sealing performance of the bushing 400 and guaranteeing the stability and reliability of the tamping device.

[0073] Optionally, in this embodiment of the invention, the outer end face 412a of the axial extension is coated with grease.

[0074] It should be noted that because the grease is viscous, the way the grease is applied to the outer end face 412a of the axial extension and there is a small gap between the outer end face 412a of the axial extension and the end face of the pressure plate 700 near the housing is mainly to prevent wear between the pressure plate and the bushing when the structure is deformed, and it mainly plays a lubricating role.

[0075] Furthermore, in this embodiment, the pressure plate 700 includes a connected plate body 710 and an annular portion 720. The inner edge of the plate body 710 is sleeved on the pick arm pin 500, and the outer edge of the plate body 710 extends axially to form the annular portion 720. The axial seal 800 is at least partially located in the area enclosed by the annular portion 720, and the end of the axial seal 800 away from the housing 100 abuts against the end face of the plate body 710.

[0076] from Figure 1 It can also be seen that, in this embodiment of the invention, the mounting part 210 of the pick arm 200 is sleeved on the pick arm pin 500. The mounting part 210 is used to hold the pressure plate 700 so that the pressure plate 700 simultaneously presses the pin sleeve 300 and the axial seal 800, thereby forming the second lubrication and sealing structure 12 together with the bushing 400, the pressure plate 700, the axial seal 800, the radial seal 600 and the pin sleeve 300.

[0077] The second lubrication and sealing structure primarily serves an axial sealing function. This second lubrication and sealing structure can also use a different lubricant than the first lubrication and sealing structure to ensure the sealing effect of the hinged components; for example, grease lubrication can be used.

[0078] Furthermore, the first and second lubrication sealing structures are nested together, which makes the sealing and lubrication effects more reliable, and also reduces the machining precision of the pressure plate, making assembly easier.

[0079] Optionally, the second lubrication seal structure 12 is grease lubricated.

[0080] In this embodiment of the invention, there are two pressure plate 700, two axial seals 800, and two mounting parts 210. The two pressure plates 700 are respectively sleeved on the pick arm pin 500, and the two axial seals 800 are respectively sleeved on the outer peripheral surfaces of the two bushings 400. One end of the two axial seals 800 abuts against the housing 100, and the other end abuts against the two pressure plates 700. The two mounting parts 210 are respectively sleeved on the pick arm pin 500 and are used to abut against the two pressure plates 700 respectively, so that the two pressure plates 700 respectively press the two ends of the pin sleeve 300 and the two axial seals 800 respectively, thereby forming two second lubrication and sealing structures 12 together with the pin sleeve 300, the two bushings 400, the two pressure plates 700, the two axial seals 800, and the two radial seals 600.

[0081] In use, compared to existing technologies that only provide axial sealing, the lubrication sealing structure 10 of the tamping device in this embodiment is provided with a radial seal 600 and an axial seal 800. The radial seal 600 and other components form a first lubrication sealing structure 11, and the axial seal 800 and other components form a second lubrication sealing structure 12. The radial seal 600, located on the inner side near the bushing 400, primarily achieves radial sealing, and the first lubrication sealing structure 11 uses oil lubrication; the axial seal 800, located on the outer side of the bushing 400, primarily achieves axial sealing, and the second lubrication sealing structure 12 uses grease lubrication.

[0082] Compared to existing technologies that use oil lubrication for axial seals, the axial seal 800 here uses grease lubrication. Therefore, the requirements for the machining accuracy and positional tolerance of the pressure plate 700 are not high, which can reduce the machining difficulty of the pressure plate 700, reduce the assembly difficulty, and also improve the oil leakage problem caused by poor fit.

[0083] Furthermore, the second lubrication sealing structure 12 located on the outer side protects the first lubrication sealing structure 11 located on the inner side, reducing the probability of oil leakage from the sealing structure of the pick arm 200 and improving the operating efficiency and service life of the tamping device. In summary, the first lubrication sealing structure 11 and the second lubrication sealing structure 12 work together, and the lubrication sealing structure 10 of the tamping device adopts a combination of oil lubrication and grease lubrication. This double sealing method reduces the probability of oil leakage from the sealing structure of the pick arm 200, improves its service life, and ensures the stable and efficient operation of the tamping device.

[0084] Secondly, the present invention provides a tamping device, which includes the lubrication and sealing structure 10 of any of the foregoing embodiments. Such a tamping device, due to its better sealing effect, can improve the problem of oil leakage caused by poor sealing at the hinge joint between the pick arm and the box body, and ensures sufficient lubrication between the pin sleeve 300 and the bushing 400, preventing seizing between them.

[0085] In summary, the embodiments of the present invention provide a lubrication and sealing structure 10 for a tamping device and a tamping device, which have at least the following advantages:

[0086] The lubrication and sealing structure of this solution has better lubrication performance;

[0087] The lubrication and sealing structure of this solution is more reliable, and the sealing structure is easy to process, manufacture, and assemble, which reduces the difficulty of processing and assembly.

[0088] This solution employs multiple seals and combines oil and grease lubrication.

[0089] This solution adopts a modular design and can be applied to different models of tamping devices.

[0090] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lubrication and sealing structure for a tamping device, characterized in that, include: The housing (100), pick arm (200), pin sleeve (300), bushing (400), pick arm pin (500), and radial seal (600). The pick arm pin (500) passes through the pick arm (200) and the housing (100) to make the pick arm (200) and the housing (100) hinged together. The inner hole of the pin sleeve (300) is interference-fitted to the outer circumferential surface of the pick arm pin (500). The bushing (400) is sleeved on the outer circumferential surface of the pin sleeve (300) and interference-fitted to the inner hole of the housing (100). The radial seal (600) is embedded in the annular groove (401) formed by the outer circumferential surface of the pin sleeve (300) and the inner circumferential surface of the bushing (400). The bushing (400), the pin sleeve (300) and the radial seal (600) together form the first lubrication sealing structure (11) and together form an annular oil cavity (11a) for storing lubricating oil. The bushing (400) extends radially and axially to form a stepped boss (410), which together with the outer circumferential surface of the pin sleeve (300) forms an annular groove (401). The opening of the annular groove (401) faces the outside of the housing (100). The inner circumferential surface of the housing (100) is recessed to form a stop (101), which engages with the stepped boss (410). The mounting part (210) of the pick arm (200) is sleeved on the pick arm pin (500). The mounting part (210) is used to hold the pressure plate (700) so that the pressure plate (700) simultaneously presses the pin sleeve (300) and the axial seal (800), thereby forming a second lubrication and sealing structure (12) together with the bushing (400), the pressure plate (700), the axial seal (800), the radial seal (600) and the pin sleeve (300). The bushing (400) is a copper bushing.

2. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that, The radial seal (600) has an annular cavity, the opening of which faces the inner end face of the bushing (400) and is jointly closed by the inner end face of the bushing (400) and the outer peripheral surface of the pin sleeve (300) to form the annular oil cavity (11a).

3. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The stepped boss (410) includes a connected radial extension (411) and an axial extension (412), one end of the radial extension (411) away from the axial extension (412) being connected to the end of the bushing (400), and one end of the axial extension (412) away from the radial extension (411) extending beyond the end face of the housing (100).

4. The lubrication and sealing structure of the tamping device according to claim 3, characterized in that: The outer end face (412a) of the axial extension is coated with grease.

5. The lubrication and sealing structure of the tamping device according to claim 3, characterized in that: It also includes a pressure plate (700) and an axial seal (800), located between the housing (100) and the mounting portion (210) of the pick arm (200). The pressure plate (700) is sleeved on the end face of the pick arm pin (500) away from the housing (100) to support the mounting portion (210) of the pick arm (200). The axial seal (800) is installed on the outer peripheral surface of the axial extension (412), with one end abutting against the end face of the housing (100) and the other end abutting against the end face of the pressure plate (700) near the housing (100).

6. The lubrication and sealing structure of the tamping device according to claim 5, characterized in that: The pressure plate (700) includes a connected plate body (710) and an annular portion (720). The inner edge of the plate body (710) is fitted onto the pick arm pin (500). The outer edge of the plate body (710) extends axially to form the annular portion (720). The axial seal (800) is at least partially located within the area enclosed by the annular portion (720), and the end of the axial seal (800) away from the housing (100) abuts against the end face of the plate body (710).

7. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The number of the pressure plate (700), the axial seal (800), and the mounting part (210) are all two. The two pressure plates (700) are respectively sleeved on the pick arm pin (500), and the two axial seals (800) are respectively sleeved on the outer peripheral surfaces of the two bushings (400). One end of the two axial seals (800) abuts against the housing (100), and the other end abuts against the two pressure plates (700). The two mounting parts (210) The pins (500) are respectively fitted onto the pick arm pins and are used to abut against the two pressure plates (700) respectively, so that the two pressure plates (700) press against the two ends of the pin sleeve (300) and the two axial seals (800) respectively, thereby making the pin sleeve (300), the two bushings (400), the two pressure plates (700), the two axial seals (800) and the two radial seals (600) together form two second lubrication sealing structures (12).

8. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The inner circumferential surface (600a) of the radial seal is fitted with the pin sleeve (300), and the outer circumferential surface (600b) of the radial seal is fitted with the inner circumferential surface (410a) of the stepped boss.

9. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The housing (100) is provided with an oil inlet (102) and an oil inlet channel (103) connected in sequence. The bushing (400) is provided with an oil groove (402). The oil groove (402) is located on the inner circumferential surface of the hole of the bushing (400) and one end is connected to the annular oil cavity (11a). The other end is connected to the end of the oil inlet channel (103) away from the oil inlet (102).

10. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The radial seal (600) is a skeleton oil seal. The radial seal (600) has an inner circumferential surface and an outer circumferential surface. Its inner circumferential surface is in contact with the outer circumferential surface of the pin sleeve (300), and its outer circumferential surface is in contact with the inner circumferential surface of the bushing (400).

11. The lubrication and sealing structure of the tamping device according to claim 1, characterized in that: The number of bushings (400) and radial seals (600) is two. The two bushings (400) are respectively fitted onto the outer circumferential surface of the pin sleeve (300) and respectively press-fitted to both ends of the inner hole of the housing (100). The two bushings (400) are spaced apart to form an oil passage for the lubricating oil. The two ends of the outer circumferential surface of the pin sleeve (300) respectively form the annular groove (401) with the two bushings (400). The two radial seals (600) are respectively embedded in the two annular grooves (401). The sleeve (300), the two bushings (400) and the two radial seals (600) together form two first lubrication sealing structures (11) and together enclose two annular oil chambers (11a). One annular oil chamber (11a) is enclosed by the pin sleeve (300), one bushing (400) and one radial seal (600), and the other annular oil chamber (11a) is enclosed by the pin sleeve (300), another bushing (400) and another radial seal (600).

12. A tamping device, characterized in that: The tamping device includes the tamping device lubrication and sealing structure as described in any one of claims 1-11.

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