Goad arm structure of tamping device suitable for complex environment

Abstract

The application discloses a pick arm structure suitable for a tamping device under a complex environment and relates to the technical field of railway maintenance equipment. The pick arm structure comprises a pick arm body, the pick arm body comprises an oil cylinder piston rod connecting part, a box body connecting part and a tamping pick connecting part which are sequentially connected and integrally formed, the oil cylinder piston rod connecting part is arranged in pairs, the oil cylinder piston rod connecting part is provided with a first hinged hole, the box body connecting part is provided with a second hinged hole, the tamping pick connecting part is provided with a tamping pick hole, the tamping pick hole is located on the side of the second hinged hole away from the first hinged hole, the distance value between the second hinged hole and the first hinged hole is greater than the distance value between the second hinged hole and the tamping pick hole, the axial center lines of the first hinged hole and the second hinged hole are parallel, the axial center lines of the tamping pick hole and the second hinged hole are perpendicular, and the box body connecting part is smoothly connected with the connecting positions of the tamping pick connecting part and the oil cylinder piston rod connecting part. The pick arm structure greatly improves the rigidity of the overall structure, reduces stress concentration and fatigue cracking.

Description

Technical Field

[0001] This invention belongs to the technical field of railway maintenance equipment, specifically relating to a tamping device pick arm structure suitable for complex environments. Background Technology

[0002] Railway lines are subjected to multiple forces over long periods, including train dynamic loads, temperature stress, and geological settlement, which can easily lead to problems such as track geometry deviations and decreased ballast bed density, seriously threatening traffic safety and line lifespan. As a core component of railway maintenance machinery, the tamping device's primary function is to tamp the railway ballast bed through high-frequency vibration and clamping action, restoring ballast bed density and track stability.

[0003] As a key load-bearing component of the tamping device, the tamping arm directly bears the high-frequency impact loads, alternating stresses, and complex bending and torsional loads during tamping operations. Its structural strength, fatigue resistance, and mechanical stability directly determine the tamping efficiency, equipment reliability, and maintenance costs. With the development of my country's railway network towards high-speed and heavy-haul operations, the frequency and intensity of line maintenance have significantly increased, placing more stringent demands on the reliability and durability of the core components of the tamping device. Under long-term heavy-load conditions, existing tamping device tamping arms are prone to stress concentration, fatigue cracking, and other failure problems, becoming a key bottleneck restricting the service life and operational efficiency of railway maintenance machinery. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and rationally designed tamping device arm structure suitable for complex environments in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A tamping device arm structure suitable for complex environments includes a tamping arm body, comprising a hydraulic cylinder piston rod connecting part, a housing connecting part, and a tamping pick connecting part connected in sequence. The hydraulic cylinder piston rod connecting parts are arranged in pairs, and the housing connecting part corresponds to the hydraulic cylinder piston rod connecting part. The hydraulic cylinder piston rod connecting part, housing connecting part, and tamping pick connecting part are integrally formed. The hydraulic cylinder piston rod connecting part is provided with a first hinge hole, the housing connecting part is provided with a second hinge hole, and the tamping pick connecting part is provided with a tamping pick hole. The tamping pick hole is located on the side of the second hinge hole away from the first hinge hole, and the distance between the second hinge hole and the first hinge hole is greater than the distance between the second hinge hole and the tamping pick hole. The axis of the first hinge hole is parallel to the axis of the second hinge hole, and the axis of the tamping pick hole is perpendicular to the axis of the second hinge hole. The connection between the housing connecting part and the tamping pick connecting part, and the connection between the housing connecting part and the hydraulic cylinder piston rod connecting part, are smoothly transitioned.

[0006] As a further optimization of the present invention, a transition rounded corner is provided at the bend of the pick arm body.

[0007] As a further optimization of the present invention, reinforcing ribs are provided between the paired piston rod connecting portions of the hydraulic cylinder.

[0008] As a further optimization of the present invention, the pick arm body is provided with a hollow weight-reducing groove.

[0009] As a further optimization of the present invention, a cross lug is provided on the outer side of one of the box connection parts. The cross lugs are arranged in pairs, and the axis of the limiting hole of the cross lug is consistent with the axis of the tamping hole. The pairs of cross lugs are arranged in an orderly manner along the axis of the tamping hole.

[0010] As a further optimization of the present invention, it also includes a housing, a pin, a bushing, a transition cylinder, a bushing, and a transition transmission assembly. The housing is located between a pair of housing connecting parts. The housing connecting part is fitted with a pin through a second hinge hole. The surface of the pin is rigidly connected to a bushing. The surface of the bushing is rotatably fitted with a transition cylinder. The surface of the transition cylinder is rotatably fitted with a bushing. The bushing is rigidly connected to the inner wall of the mounting hole of the housing. The transition transmission assembly is disposed on the housing. Under the transmission of the transition transmission assembly, the single stroke of the bushing rotation includes a relative rotation stroke one between the bushing and the transition cylinder and a relative rotation stroke two between the transition cylinder and the bushing.

[0011] As a further optimization of the present invention, the inner surface of the bushing is provided with an internal thread portion, the outer surface of the pin is provided with an external thread portion, and the bushing and the pin are connected by a threaded connection through the mating of the internal thread portion and the external thread portion.

[0012] As a further optimization of the present invention, the transition transmission assembly includes an end cap, a first abutment block, a second abutment block, a third abutment block, and a spring. The end caps are arranged in pairs and located at both ends of the bushing, and are rigidly connected to the housing by fasteners. The first abutment block is provided on the radial side of the bushing. A first sliding groove is provided on the inner surface of the transition cylinder. The first sliding groove is located at the axial end of the transition cylinder, and a second abutment block is provided in the first sliding groove. The second abutment block protrudes out of the transition cylinder along the axial direction. One of the end caps has a second sliding groove at the end facing the transition cylinder. A spring is provided in the second sliding groove. The outer end of the spring is fixedly connected to the third abutment block. The third abutment block slides with the second sliding groove. When the transition transmission assembly is in the initial position, the first abutment block slides with the transition cylinder through the first sliding groove, the second abutment block is located in the second sliding groove, and the second abutment block is located on the side of the third abutment block away from the spring.

[0013] As a further optimization of the present invention, the pin shaft is provided with an oil injection channel and an oil distribution channel. The oil injection channel is distributed along the axial direction of the pin shaft, and the oil distribution channel is distributed along the radial direction of the pin shaft. The oil injection channel and the oil distribution channel are connected. An oil injection nozzle is installed at the outer end of the pin shaft, and the outer end of the oil injection channel is connected to the oil injection nozzle. A radially distributed first oil injection hole is opened on the bushing, and a radially distributed second oil injection hole is opened on the transition cylinder. Distribution grooves are respectively opened on the inner and outer surfaces of the transition cylinder, and the distribution grooves are connected to the second oil injection hole. When the pin shaft is in the initial position, the first oil injection hole and the second oil injection hole are connected.

[0014] As a further optimization of the present invention, the outer end of the mounting hole of the housing is provided with a stepped surface, and a sealing element is provided at the stepped surface. The sealing element rubs against the stepped surface, the end face of the end cap, and the outer surface of the bushing.

[0015] The present invention has at least the following beneficial effects: The present invention provides a tamping device pick arm structure suitable for complex environments, including a pick arm body, the pick arm body including a hydraulic cylinder piston rod connecting part, a box connecting part and a tamping pick connecting part connected in sequence and integrally formed, eliminating defects such as welding stress and cracks caused by welding, and greatly improving the overall structural rigidity and structural integrity. The hydraulic cylinder piston rod connecting part is provided with a first hinge hole, the box connecting part is provided with a second hinge hole, and the tamping pick connecting part is provided with a tamping pick hole. The distance between the second hinge hole and the first hinge hole is greater than the distance between the second hinge hole and the tamping pick hole, forming a force-increasing lever ratio, improving the tamping operation efficiency of the tamping device, reducing the hydraulic cylinder load, and the connection between the box connecting part and the tamping pick connecting part and the connection between the box connecting part and the hydraulic cylinder piston rod connecting part are smoothly transitioned, greatly reducing stress concentration, reducing fatigue cracking from the root, and significantly extending the service life of the pick arm body; Furthermore, the pick arm structure also includes a housing, a pin, a bushing, a transition cylinder, a bushing, and a transition transmission assembly. The housing is located between paired housing connection parts, and the pin, bushing, transition cylinder, and bushing are arranged coaxially in sequence. Through the transmission cooperation of the transition transmission assembly, the pick arm body drives the pin to perform a single-stroke swing process. The bushing rotates relative to the transition cylinder for a stroke one. Under the transmission constraint of the transition transmission assembly, the bushing and the transition cylinder are relatively fixed, causing the transition cylinder to rotate relative to the bushing for a stroke two. The single stroke of the bushing rotation is the sum of the relative rotation stroke one between the bushing and the transition cylinder and the relative rotation stroke two between the transition cylinder and the bushing. Throughout the process, the impact and friction loads generated during the operation of the pick arm structure are jointly borne by the two friction pairs of bushing-transition cylinder and transition cylinder-bushing, rather than being concentrated on a single friction contact surface, significantly reducing the risk of uneven wear and burn-out. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the pickaxe arm body of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the pickaxe arm body of the present invention. Figure 2 ; Figure 3 This is a partial cross-sectional view of the pickaxe arm structure of the present invention; Figure 4 This is the invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the bushing structure of the present invention; Figure 6 This is a schematic diagram of the transition cylinder of the present invention; Figure 7 This is a schematic diagram of the end cap structure of the present invention; Figure 8 This is a state distribution diagram of the first abutting block, the second abutting block, the third abutting block, and the spring when they are in their initial positions according to the present invention.

[0017] In the diagram: 1. Hammer arm body; 11. Cylinder piston rod connection; 101. First hinge hole; 12. Box body connection; 102. Second hinge hole; 13. Hammer connection; 103. Hammer hole; 104. Hollowed-out weight-reducing groove; 14. Reinforcing rib; 15. Cross ear plate; 2. Pin; 21. External thread; 3. Box body; 4. End cover; 41. Fastener; 42. Second slide groove; 43. Third abutment block; 44. Spring; 51. Oil nozzle; 52. Oil injection channel; 53. Oil distribution channel; 54. First oil injection hole; 55. Second oil injection hole; 56. Distribution groove; 6. Bushing; 7. Transition cylinder; 71. Second abutment block; 72. First slide groove; 8. Bushing; 81. First abutment block; 82. Internal thread; 9. Seal. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] In the description of the embodiments of this application, it should be understood that the terms "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product of this application is usually placed in, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] like Figure 1 and Figure 2 As shown, the present invention provides a tamping device arm structure suitable for complex environments, including an arm body 1. The arm body 1 includes a hydraulic cylinder piston rod connecting part 11, a housing connecting part 12, and a tamping pick connecting part 13 connected in sequence. The hydraulic cylinder piston rod connecting parts 11 are arranged in pairs, and the housing connecting part 12 is correspondingly arranged with the hydraulic cylinder piston rod connecting part 11. The hydraulic cylinder piston rod connecting part 11, the housing connecting part 12, and the tamping pick connecting part 13 are integrally formed, so that the final arm body 1 is U-shaped. The integral casting eliminates defects such as welding stress and cracks caused by welding, and the overall structural rigidity and structural integrity are greatly improved. The hydraulic cylinder piston rod connecting part 11 is provided with a first hinge hole 101, the housing connecting part 12 is provided with a second hinge hole 102, and the tamping pick connecting part 13 is provided with... The device has a tamping hole 103 located on the side of the second hinge hole 102 away from the first hinge hole 101. The distance between the second hinge hole 102 and the first hinge hole 101 is greater than the distance between the second hinge hole 102 and the tamping hole 103, forming a lever ratio that increases the tamping efficiency of the tamping device and reduces the load on the hydraulic cylinder. The axis of the first hinge hole 101 is parallel to the axis of the second hinge hole 102, and the axis of the tamping hole 103 is perpendicular to the axis of the second hinge hole 102. The connection between the housing connection part 12 and the tamping hole connection part 13, as well as the connection between the housing connection part 12 and the hydraulic cylinder piston rod connection part 11, are smoothly transitioned, which greatly reduces stress concentration, reduces fatigue cracking from the source, and significantly extends the service life of the tamping arm body 1.

[0021] It should be noted that further reading is required. Figure 1 and Figure 2 The bending points of the pick arm body 1 are provided with transition fillets. For example, the thickness direction of the connection between the cylinder piston rod connection 11 and the box connection 12 is set with a large radius fillet, so that the connection between the cylinder piston rod connection 11 and the box connection 12 is smooth. This avoids obvious stress concentration caused by a single local cross section and discontinuous transition. During tamping operations, high-frequency impact loads and alternating stresses are repeatedly applied to the stress concentration area, which can easily cause microcracks to initiate and propagate, eventually leading to the breakage and failure of the pick arm. In severe cases, it can even cause work interruption and equipment damage.

[0022] For example, see [link to relevant documentation]. Figure 2 A reinforcing rib 14 is provided between the paired piston rod connecting parts 11 of the hydraulic cylinders. The reinforcing rib 14 connects the piston rod connecting parts 11 of the two hydraulic cylinders into a whole, which enhances the overall rigidity, suppresses opening, swaying and elastic deformation during operation, and ensures driving accuracy and tamping action stability.

[0023] It should be noted that, as Figure 1As shown, the pick arm body 1 has a hollow weight reduction groove 104, and the hollow weight reduction groove 104 on the paired cylinder piston rod connection part 11 and the box connection part 12 adopts a long strip groove with horizontal and vertical interlacing. Under the premise of ensuring the overall rigidity, the self-weight of the component is reduced by 15% to 20%, which effectively reduces the driving load and inertial impact.

[0024] For example, see [link to relevant documentation]. Figure 1 A cross lug 15 is provided on the outer side of one of the housing connection parts 12. The cross lugs 15 are arranged in pairs. The axis of the limiting hole of the cross lug 15 is consistent with the axis of the tamping hole 103. The cross lugs 15 are arranged in pairs and distributed in an orderly manner along the axis of the tamping hole 103. The cross lugs 15 are used to install auxiliary support members. The auxiliary support members are used to provide auxiliary support and limit the tamping claw installed in the tamping hole 103. That is, the cross lugs 15 and the tamping hole 103 are used to limit the installation of the tamping claw installed later.

[0025] For example, see [link to relevant documentation]. Figure 3 , Figure 4 The pickaxe arm structure also includes a housing 3, a pin 2, a bushing 8, a transition cylinder 7, a bushing 6, and a transition transmission assembly. The housing 3 is located between paired housing connecting parts 12. The housing connecting part 12 is equipped with a pin 2 through a second hinge hole 102. The surface of the pin 2 is rigidly connected to the bushing 8. The surface of the bushing 8 is rotatably mounted with the transition cylinder 7. The surface of the transition cylinder 7 is rotatably mounted with the bushing 6. The bushing 6 is rigidly connected to the inner wall of the mounting hole of the housing 3. The transition transmission assembly is set on the housing 3. Under the transmission of the transition transmission assembly, the single stroke of the rotation of the bushing 8 includes the relative rotation stroke one between the bushing 8 and the transition cylinder 7 and the relative rotation stroke two between the transition cylinder 7 and the bushing 6.

[0026] It should be noted that the hydraulic cylinder piston rod connecting part 11 is used to install the output end of the hydraulic cylinder piston rod through the first hinge hole 101, and the tamping pick connecting part 13 is used to install the tamping pick claw through the tamping pick hole 103. Under the drive of the hydraulic cylinder piston rod, the pick arm body 1 reciprocates around the axis of the second hinge hole 102. During the single-stroke swing of the pick arm body 1, the pick arm body 1 drives the bushing 8 to rotate once through the pin 2, that is, the bushing 8 rotates by a preset angle α. Due to the transmission constraint of the transition transmission component, the bushing 8 first rotates by Bα, where B < 1, that is, the bushing 8 and the transition cylinder 7 have a relative rotation stroke of one. Then, under the transmission constraint of the transition transmission component, the bushing 8 continues to rotate, so that the bushing 8 and the transition cylinder 7 are relatively fixed, that is, the bushing 8 drives the transition cylinder 7 to continue to rotate by (1-B)α, until the bushing 8 completes the rotation of the preset angle α. At this time, the transition cylinder 7 and the bushing 6 have a relative rotation stroke of one. The rotational stroke is two. Therefore, the single rotational stroke of bushing 8 is the sum of the relative rotational stroke one between bushing 8 and transition cylinder 7 and the relative rotational stroke two between transition cylinder 7 and bushing 6. Similarly, when the pick arm body 1 performs the above single stroke reverse reset, transition cylinder 7 rotates in the opposite direction (1-B)α with bushing 8 until transition cylinder 7 is in the initial position. Bushing 8 continues to rotate in the opposite direction Bα until bushing 8 is in the initial position. In the whole process, the impact and friction load generated during the operation of the pick arm structure are jointly borne by two friction pairs, bushing 8-transition cylinder 7 and transition cylinder 7-bushing 6, and are not concentrated on a single friction contact surface. That is, the friction stroke is reduced, significantly reducing the risk of uneven wear and burning. Moreover, with the bushing 6 blocking the mounting hole of housing 3 and bushing 8 blocking the pin 2, the bushing 8, transition cylinder 7, and bushing 6 that receive friction are easy to maintain and replace, preventing wear and deformation of the mounting surface of pin 2 and the mounting hole surface of housing 3, and reducing the maintenance cost of the pick arm structure.

[0027] For example, see [link to relevant documentation]. Figure 4 and Figure 5 The inner surface of the bushing 8 is provided with an internal thread 82, and the outer surface of the pin 2 is provided with an external thread 21. The bushing 8 and the pin 2 are connected by the mating of the internal thread 82 and the external thread 21. After the bushing 6, the transition cylinder 7, and the bushing 8 are assembled coaxially in sequence, the pin 2 is screwed into the bushing 8 through the second hinge hole 102. The threaded engagement allows the pin 2 and the bushing 8 to form a rigid whole without relative rotation, and the large thread engagement area reduces the probability of loosening under high-frequency impact and alternating loads, making it suitable for the harsh working conditions of railway tamping. Figure 3 Taking the orientation shown as an example, the pin 2 is screwed in from left to right, and a fastening nut is used at the right end of the pin 2 to rigidly connect the pin 2 and the pick arm body 1.

[0028] For example, see [link to relevant documentation]. Figure 3 , Figure 5 , Figure 6 and Figure 7The transition transmission assembly includes end caps 4, a first abutment block 81, a second abutment block 71, a third abutment block 43, and a spring 44. The end caps 4 are arranged in pairs and located at both ends of the bushing 6, and are rigidly connected to the housing 3 by fasteners 41, exemplarily fasteners 41 being screws. The first abutment block 81 is provided on the radial side of the bushing 8. Figure 5 As shown, the first abutment block 81 is located on the radial side of the right end of the bushing 8, and the inner surface of the transition cylinder 7 is provided with a first sliding groove 72, which is located at the axial end of the transition cylinder 7 (e.g., Figure 6 The right end of the transition cylinder 7 shown), and a second abutment block 71 is provided in the first groove 72. The second abutment block 71 protrudes out of the transition cylinder 7 along the axial direction of the transition cylinder 7, and one of the end caps 4 (to Figure 3 For example, the end cap 4 on the right side of the transition cylinder 7 has a second groove 42. A spring 44 is installed in the second groove 42. A third abutment block 43 is fixedly connected to the outer end of the spring 44. The third abutment block 43 slides with the second groove 42. When the transition transmission assembly is in the initial position, that is, the transition cylinder 7 is rotated and installed in the bushing 6, and the bushing 8 is installed into the transition cylinder 7 from right to left. Then, after the end cap 4 is installed on the housing 3 by the fastener 41, the first abutment block 81 is located in the first groove 72 and slides with the transition cylinder 7 through the first groove 72. The second abutment block 71 is inserted into the second groove 42, and the second abutment block 71 is located on the side of the third abutment block 43 away from the spring 44.

[0029] It should be noted that the first abutting blocks 81 are arranged in pairs, and the paired first abutting blocks 81 are symmetrical about the center line of the bushing 8, and the second abutting block 71 and the third abutting block 43 are arranged corresponding to the first abutting block 81.

[0030] Continue reading Figure 8 The diagram simply illustrates the relative positions of the first abutment block 81, the second abutment block 71, the third abutment block 43, and the spring 44 in the initial state. When the pin 2 rotates clockwise, the first abutment block 81 slides along the first slide groove 72. At this time, the pin 2 rotates relative to the transition cylinder 7. Figure 8The dashed line indicates the trajectory position of the first groove 72 in the transition cylinder 7. When the first abutting block 81 abuts against the second abutting block 71, the pin 2 drives the bushing 8 to complete the first relative rotation stroke. Then, the pin 2 continues to rotate, and the first abutting block 81 drives the transition cylinder 7 to rotate clockwise through the second abutting block 71, causing the third abutting block 43 to rotate clockwise to compress the spring 44, achieving the second relative rotation stroke of the transition cylinder 7 relative to the bushing 6. At this point, the pin 2 completes a single rotation stroke of the preset angle α. Conversely, during the counter-clockwise rotation and reset process of the pin 2, under the elastic force of the spring 44, the third abutting block 43 abuts against the second abutting block 71 and rotates counter-clockwise. The transition cylinder 7 rotates relative to the bushing 6 to its initial position. Then, the pin 2 continues to rotate counter-clockwise, while the second abutting block 71 is limited by the second groove 42, preventing the transition cylinder 7 from continuing to rotate with the bushing 8 due to friction, thus achieving the counter-clockwise rotation of the bushing 8 relative to the transition cylinder 7 to the initial position of the pin 2.

[0031] It should be further explained that after the end cap 4 is installed onto the housing 3 by fastener 41, the process of installing the pin 2 onto the pick arm body 1 is to screw the pin 2 so that the external thread 21 on the pin 2 is screwed into the internal thread 82 of the bushing 8. Preferably, the screwing direction of the pin 2 is consistent with the sliding direction of the first abutment block 81 along the first slide groove 72 away from the second abutment block 71.

[0032] For example, see [link to relevant documentation]. Figure 3 and Figure 4 The pin 2 has an internal oil injection channel 52 and an oil distribution channel 53. The oil injection channel 52 is distributed along the axial direction of the pin 2, and the oil distribution channel 53 is distributed along the radial direction of the pin 2. The oil injection channel 52 and the oil distribution channel 53 are connected. An oil injection nozzle 51 is installed at the outer end of the pin 2. The outer end of the oil injection channel 52 is connected to the oil injection nozzle 51. The oil injection nozzle 51 is used to communicate with the oil reservoir and deliver the lubricating oil in the oil reservoir to the oil injection channel 52. The bushing 8 has radially distributed first oil injection holes 54, and the transition cylinder 7 has radially distributed second oil injection holes 55. Figure 6 As shown, the inner and outer surfaces of the transition cylinder 7 are respectively provided with distribution grooves 56. The distribution grooves 56 are connected to the second oil injection hole 55. When the pin 2 is in the initial position, the first oil injection hole 54 and the second oil injection hole 55 are connected. When lubrication is performed periodically, the supplied lubricating oil enters the second oil injection hole 55 through the oil injection channel 52, the oil distribution channel 53, and the first oil injection hole 54, and further seeps into the distribution grooves 56. Thus, when the pin 2 rotates, the rotation of the transition cylinder 7 relative to the bushing 8 and the bushing 6 will coat the lubricating oil in the distribution grooves 56 onto the outer surface of the bushing 8 and the inner surface of the bushing 6, so as to achieve the lubrication effect on the relatively rotating friction surfaces.

[0033] For example, see [link to relevant documentation]. Figure 3The outer end of the mounting hole of the housing 3 is provided with a stepped surface, and a sealing element 9 is provided at the stepped surface. After the end cover 4 is fixedly installed on the housing 3, the sealing element 9 is squeezed and limited in the space enclosed by the stepped surface of the housing 3, the end cover 4 and the bushing 6, so that the sealing element 9 rubs against the stepped surface, the end face of the end cover 4 and the outer surface of the bushing 6 to achieve sealing of the gap between the bushing 6 and the end cover 4. It should be noted that a sealing ring is also provided at the rotation of the end cover 4 and the pin 2. The sealing ring is embedded in the inner wall of the hole on the end cover 4 where the pin 2 is installed.

[0034] It should be noted that this tamping device arm structure, applicable to complex environments, is integrally cast from the cylinder piston rod connection 11, the box connection 12, and the tamping pick connection 13, eliminating defects such as welding stress and cracks caused by welding. The overall structural rigidity and integrity are greatly improved. Furthermore, the distance between the second hinge hole 102 and the first hinge hole 101 is greater than the distance between the second hinge hole 102 and the tamping pick hole 103, forming a force-increasing lever ratio, improving the tamping efficiency of the tamping device, reducing the cylinder load, and ensuring a smooth transition at the connection points of the box connection 12 and the tamping pick connection 13, as well as the connection points of the box connection 12 and the cylinder piston rod connection 11, significantly reducing stress concentration, reducing fatigue cracking from the root, and significantly extending the service life of the tamping arm body 1. When the pick arm body 1 swings, the pin 2 swings back and forth with the pick arm body 1. For example, when the pin 2 rotates clockwise, the first abutting block 81 slides along the first sliding groove 72. At this time, the pin 2 rotates relative to the transition cylinder 7 until the first abutting block 81 abuts against the second abutting block 71. The pin 2 drives the bushing 8 to complete the first relative rotation stroke. Then, the pin 2 continues to rotate, and the first abutting block 81 drives the transition cylinder 7 to rotate clockwise through the second abutting block 71, so that the third abutting block 43 rotates clockwise to compress the spring 44, realizing the second relative rotation stroke of the transition cylinder 7 relative to the bushing 6. Thus, the pin 2 completes the single stroke of rotation of the preset angle α. In the whole process, the impact and friction load generated during the operation of the pick arm structure are transferred from the bushing 8 to the transition cylinder 7. The two friction pairs, transition cylinder 7 and bushing 6, share the load and do not concentrate on a single friction contact surface. Instead, during the counterclockwise rotation and reset process of pin 2, under the elastic force of spring 44, the third abutting block 43 abuts against the second abutting block 71 and rotates counterclockwise. The transition cylinder 7 rotates relative to bushing 6 to the initial position of transition cylinder 7. Then, pin 2 continues to rotate counterclockwise, while the second abutting block 71 is limited by the second sliding groove 42, so that the transition cylinder 7 will not continue to rotate with bushing 8 due to friction. Thus, bushing 8 rotates counterclockwise relative to transition cylinder 7 to the initial position of pin 2, completing one reciprocating rotation of pin 2. By repeating the above actions, the reciprocating swing of the pick arm body 1 can be achieved, so that the pick claw installed at the pick hole 103 can perform tamping operations on the railway track bed. When regular lubrication is required, lubricating oil is injected into the oil injection channel 52 through the oil injection nozzle 51, and then continues to enter the second oil injection hole 55 through the oil distribution channel 53 and the first oil injection hole 54, so that the lubricating oil flows into the distribution groove 56. Thus, when the pin 2 rotates, the rotation of the transition cylinder 7 relative to the bushing 8 and the bushing 6 will coat the lubricating oil in the distribution groove 56 onto the outer surface of the bushing 8 and the inner surface of the bushing 6, so as to achieve the lubrication effect on the relatively rotating friction surfaces.

[0035] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A tamping device arm structure suitable for complex environments, characterized in that, The device includes a pick arm body (1), which comprises a hydraulic cylinder piston rod connecting part (11), a housing connecting part (12), and a tamping pick connecting part (13) connected in sequence. The hydraulic cylinder piston rod connecting parts (11) are arranged in pairs, and the housing connecting part (12) is correspondingly arranged with the hydraulic cylinder piston rod connecting part (11). The hydraulic cylinder piston rod connecting part (11), the housing connecting part (12), and the tamping pick connecting part (13) are integrally formed. The hydraulic cylinder piston rod connecting part (11) is provided with a first hinge hole (101), the housing connecting part (12) is provided with a second hinge hole (102), and the tamping pick connecting part (13) is provided with a tamping pick hole (103). The tamping hole (103) is located on the side of the second hinge hole (102) away from the first hinge hole (101), and the distance between the second hinge hole (102) and the first hinge hole (101) is greater than the distance between the second hinge hole (102) and the tamping hole (103). The axis of the first hinge hole (101) and the axis of the second hinge hole (102) are parallel, and the axis of the tamping hole (103) is perpendicular to the axis of the second hinge hole (102). The connection between the box body connection part (12) and the tamping hole connection part (13) and the connection between the box body connection part (12) and the cylinder piston rod connection part (11) are smoothly transitioned.

2. The pick arm structure of a tamping device suitable for complex environments according to claim 1, characterized in that, The bend of the pick arm body (1) is provided with a transition rounded corner.

3. The pick arm structure of a tamping device suitable for complex environments according to claim 2, characterized in that, A reinforcing rib (14) is provided between the piston rod connecting parts (11) of the paired hydraulic cylinders.

4. The pick arm structure of a tamping device suitable for complex environments according to claim 3, characterized in that, The pick arm body (1) is provided with a hollow weight reduction groove (104).

5. The pick arm structure of a tamping device suitable for complex environments according to claim 3, characterized in that, Cross ear plates (15) are provided on the outside of one of the box connection parts (12). The cross ear plates (15) are arranged in pairs. The axis of the limiting hole of the cross ear plate (15) is consistent with the axis of the tamping hole (103). The cross ear plates (15) are arranged in pairs in an orderly manner along the axis of the tamping hole (103).

6. The pick arm structure of a tamping device suitable for complex environments according to claim 3, characterized in that, It also includes a housing (3), a pin (2), a bushing (8), a transition cylinder (7), a bushing (6), and a transition transmission assembly. The housing (3) is located between a pair of housing connecting parts (12). The housing connecting part (12) is equipped with a pin (2) through a second hinge hole (102). The surface of the pin (2) is rigidly connected to the bushing (8). The surface of the bushing (8) is rotatably mounted with the transition cylinder (7). The surface of the transition cylinder (7) is rotatably mounted with the bushing (6). The bushing (6) is rigidly connected to the inner wall of the mounting hole of the housing (3). The transition transmission assembly is set on the housing (3). Under the transmission of the transition transmission assembly, the single stroke of the bushing (8) includes the relative rotation stroke one between the bushing (8) and the transition cylinder (7) and the relative rotation stroke two between the transition cylinder (7) and the bushing (6).

7. The pick arm structure of a tamping device suitable for complex environments according to claim 6, characterized in that, The inner surface of the bushing (8) is provided with an internal thread (82), and the outer surface of the pin (2) is provided with an external thread (21). The bushing (8) and the pin (2) are connected by the mating of the internal thread (82) and the external thread (21).

8. The pick arm structure of a tamping device suitable for complex environments according to claim 7, characterized in that, The transition transmission assembly includes an end cap (4), a first abutment block (81), a second abutment block (71), a third abutment block (43), and a spring (44). The end caps (4) are arranged in pairs and are located at both ends of the bushing (6). The end caps (4) are rigidly connected to the housing (3) by fasteners (41). The first abutment block (81) is provided on the radial side of the bushing (8). The inner surface of the transition cylinder (7) is provided with a first groove (72). The first groove (72) is located at the axial end of the transition cylinder (7), and a second abutment block (71) is provided in the first groove (72). The second abutment block (71) is located along the axial direction of the transition cylinder (7). The end cap (4) protrudes out of the transition cylinder (7), and one of the end caps (4) is provided with a second groove (42) at one end facing the transition cylinder (7). A spring (44) is provided in the second groove (42), and a third abutment block (43) is fixedly connected to the outer end of the spring (44). The third abutment block (43) slides in cooperation with the second groove (42). When the transition transmission assembly is in the initial position, the first abutment block (81) slides in cooperation with the transition cylinder (7) through the first groove (72). The second abutment block (71) is located in the second groove (42), and the second abutment block (71) is located on the side of the third abutment block (43) away from the spring (44).

9. The pick arm structure of a tamping device suitable for complex environments according to claim 8, characterized in that, The pin (2) is provided with an oil injection channel (52) and an oil distribution channel (53). The oil injection channel (52) is distributed along the axial direction of the pin (2), and the oil distribution channel (53) is distributed along the radial direction of the pin (2). The oil injection channel (52) and the oil distribution channel (53) are connected. An oil injection nozzle (51) is installed at the outer end of the pin (2). The outer end of the oil injection channel (52) is connected to the oil injection nozzle (51). The bushing (8) is provided with a radially distributed first oil injection hole (54). The transition cylinder (7) is provided with a radially distributed second oil injection hole (55). The inner and outer surfaces of the transition cylinder (7) are respectively provided with distribution grooves (56). The distribution grooves (56) are connected to the second oil injection hole (55). When the pin (2) is in the initial position, the first oil injection hole (54) and the second oil injection hole (55) are connected.

10. The pick arm structure of a tamping device suitable for complex environments according to claim 9, characterized in that, The outer end of the mounting hole of the housing (3) is provided with a stepped surface, and a sealing element (9) is provided at the stepped surface. The sealing element (9) rubs against the stepped surface, the end face of the end cap (4) and the outer surface of the bushing (6).

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