A double-end rammer

Abstract

A double-end rammer, comprising a machine box, a rotary support assembly is arranged on the upper part of the machine box to rotate the machine box, two self-driving ramming assemblies are symmetrically arranged at both ends of the machine box, the self-driving ramming assembly comprises a driving device fixedly arranged on the upper part of the machine box and a ramming device arranged on the lower part of the machine box, an upper belt pulley is mounted on the output shaft of the driving device, the ramming device comprises a belt eccentric wheel, the upper belt pulley and the belt eccentric wheel are connected through a belt, and the ramming device is driven to work by the vibration generated when the belt eccentric wheel rotates; this design enables a small excavator to drive the double-end rammer to simultaneously perform ramming work on both sides of the steel rail, improves the work efficiency, solves the problem of insufficient power of the small excavator, greatly improves the work efficiency, and realizes the limitation that a small excavator cannot drive a double-end rammer.

Description

Technical Field

[0001] This utility model relates to the field of railway maintenance machinery technology, and more specifically to a double-head tamping machine. Background Technology

[0002] Due to the daily wear and tear on sleepers and ballast, railway tracks require maintenance to ensure smooth train transport. After replacing sleepers, tamping and cleaning are necessary. However, due to railway schedules, large tamping machines are unsuitable for daily operations, and manual labor is inconvenient, labor-intensive, inefficient, and produces poor quality work. Small excavators, due to insufficient power, can only be used with single-head tampers, requiring tamping from both sides, resulting in low efficiency. Utility Model Content

[0003] One advantage of this invention is that it provides a double-headed tamping machine. During operation, the drive unit rotates the pulley, which in turn rotates the eccentric block via belt transmission, generating vibration. This vibration is transmitted to the tamping pick, creating continuous vibration. The hydraulic cylinder's clamp size is adjustable to adapt to different working environments. This design allows a small excavator to drive the double-headed tamping machine simultaneously to tamp both sides of the rail, improving work efficiency and solving the problem of insufficient power in small excavators. It significantly increases work efficiency and overcomes the limitation that small excavators cannot operate double-headed tamping machines.

[0004] To achieve at least one of the advantages of this utility model, this utility model provides a double-head tamping machine, including a machine housing. A rotary support assembly for rotating the machine housing is provided on the upper part of the machine housing. Two self-driven tamping assemblies are symmetrically arranged at both ends of the machine housing. Each self-driven tamping assembly includes a drive device fixedly installed on the upper part of the machine housing and a tamping device installed on the lower part of the machine housing. An upper pulley is installed on the output shaft of the drive device. The tamping device includes a belt eccentric pulley. The upper pulley and the belt eccentric pulley are connected by a belt. The vibration generated when the belt eccentric pulley rotates drives the tamping device to work.

[0005] According to one embodiment of the present invention, the drive device includes either an engine assembly or a hydraulic motor assembly.

[0006] According to one embodiment of the present invention, the engine assembly includes an engine, and the output shaft of the engine is fixedly connected to an upper pulley.

[0007] According to one embodiment of the present utility model, the hydraulic motor assembly includes connecting seats fixedly disposed at both ends of the upper part of the housing, a linkage sleeve fixedly disposed at the upper end of the connecting seat, and a hydraulic motor fixedly connected to the inner end of the linkage sleeve. The internal structure of the linkage sleeve is rotatably connected to a splined shaft via two bearings, and the splined shaft is connected to the output shaft of the hydraulic motor via a spline. The outer end of the spline shaft is connected to the upper pulley by a sleeve connection. The spline shaft is also provided with a flat key. The inner side of the upper pulley is provided with a keyway that matches the flat key. The flat key and the keyway cooperate to make the upper pulley and the spline shaft rotate synchronously. The slewing support assembly includes a slewing assembly located on the upper part of the upper housing. A center joint is provided at the center of the slewing assembly. The hydraulic motor is connected to a drain pipe and an inlet / return pipe, which are connected to the center joint.

[0008] According to one embodiment of the present invention, the chassis includes an upper chassis with a horizontally extending elongated rectangular box structure, and the rotary support assembly includes a rotary assembly disposed on the upper part of the upper chassis, with a center joint disposed at the center of the rotary assembly; an upper support is fixedly disposed on the upper part of the rotary assembly.

[0009] According to one embodiment of the present invention, the chassis includes a lower chassis fixedly disposed at the lower part of both ends of the upper chassis. Shock-absorbing blocks are disposed at the four corner points of the lower end of the lower chassis, and a tamping bracket is connected through the shock-absorbing blocks. A central tube is disposed in the middle of the tamping bracket, and side tubes are disposed at both ends of the tamping bracket. An eccentric pulley is mounted on the outer end of the central tube in a relatively rotatable manner. An eccentric block is also disposed on the other end of the central tube in a rotatable manner. The eccentric block is correspondingly disposed with the belt eccentric pulley and rotates synchronously. The two ends of the side tube are fixedly connected with tamping picks.

[0010] According to one embodiment of the present invention, the tamping pick includes a pick sleeve fixedly connected to a side tube, a pick rod is detachably installed inside the pick sleeve, a pick head is fixedly provided at the lower end of the pick rod, and a protective plate is provided on the outer side of the pick rod.

[0011] According to one embodiment of the present invention, adjusting rods are fixedly connected to both ends of the side tube, and the upper ends of the two adjusting rods on the same side are hinged to both ends of the same oil cylinder; the upper end of the adjusting rod is provided with a grease inlet for injecting grease into the hinge joint between the adjusting rod and the oil cylinder.

[0012] According to one embodiment of the present invention, a connecting rod is also included. The two ends of the connecting rod are respectively connected to two adjusting rods located on the same side in a hinged manner. The hinge point of the connecting rod and the left adjusting rod is located at the upper part of the adjusting rod, and the hinge point of the connecting rod and the right adjusting rod is located at the lower end of the adjusting rod. The oil cylinder is connected to the center joint through a hydraulic pipeline. When the oil cylinder extends or retracts, the two adjusting rods are kept rotating synchronously through the connecting rod.

[0013] According to one embodiment of the present invention, a tensioning bracket is fixedly provided at the end of the upper chassis. A tensioning shaft is connected to the tensioning bracket in a rotatable manner. A pull rod is fixedly connected to the end of the tensioning shaft. A tensioning wheel is provided at the end of the pull rod in a rotatable manner. A torsion spring is also provided on the tensioning bracket and applies a force to the pull rod to make it rotate clockwise. The tensioning wheel is coupled to the belt.

[0014] As can be seen from the above, the double-head tamping machine and its rotary support assembly, self-driven tamping assembly, tamping device, tamping pick, adjustment mechanism, tensioning mechanism and shock absorption mechanism provided in this application achieve synchronous and efficient vibration tamping of both heads by symmetrically setting up double self-driven tamping assemblies and adopting an engine-driven eccentric wheel structure. At the same time, combined with the rotary support assembly, it can achieve multi-angle operation, which has the advantages of improving tamping operation efficiency, enhancing vibration transmission effect and realizing synchronous operation of both heads. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 2 This is a partial enlarged structural schematic diagram of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present utility model. Figure 1 ; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present utility model. Figure 2 ; Figure 5 This is a cross-sectional view of the motor in Embodiment 2 of this utility model; Figure 6 This is an enlarged schematic diagram of the adjusting rod structure in Embodiment 2 of this utility model; In the attached diagram: 1. Upper chassis, 2. Upper bracket, 3. Center joint, 4. Slewing assembly, 5. Engine, 6. Upper pulley, 7. Belt, 8. Hydraulic line, 9. Cylinder, 10. Adjusting rod, 11. Side pipe, 12. Connecting rod, 13. Belt eccentric pulley, 14. Pick head, 15. Pick rod, 16. Eccentric block, 17. Pick sleeve, 18. Shock absorber, 19. Lower chassis, 20. Tensioner, 21. Drain pipe, 22. Hydraulic motor, 23. Linkage sleeve, 24. Oil filler port, 25. Belt guard, 26. Connecting hole, 27. Guard bracket, 28. Inlet and return oil pipes, 29. Guard plate, 30. Bearing, 31. Splined shaft, 32. Flat key, 33. Bolt. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description will be provided in conjunction with the appendix of this utility model. Figure 1 ~Appendix Figure 6 The present invention will be described in more detail below.

[0017] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, the above terms should not be construed as limitations on this utility model.

[0019] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0020] Current technologies present numerous challenges for railway track maintenance. Large tamping equipment is limited by railway schedules, making routine maintenance difficult. Manual tamping is labor-intensive and inefficient. Small excavators, limited by power, can only carry tamping devices on one side, requiring repeated adjustments to complete bilateral work, severely impacting efficiency. The narrow track environment demands greater equipment flexibility; traditional equipment struggles to operate efficiently within confined spaces.

[0021] This utility model provides a double-head tamping machine, including a machine casing. A rotating support assembly is mounted on the upper part of the casing to allow it to rotate. Two self-driven tamping components are symmetrically arranged at both ends of the casing. Each self-driven tamping component includes a drive device fixedly mounted on the upper part of the casing and a tamping device mounted on the lower part of the casing. An upper pulley 6 is mounted on the output shaft of the drive device. The tamping device includes a belt eccentric pulley 13. The upper pulley 6 and the belt eccentric pulley 13 are connected by a belt 7. The vibration generated when the belt eccentric pulley 13 rotates drives the tamping device. The drive device includes either an engine 5 assembly or a hydraulic motor 22 assembly. The engine 5 assembly includes an engine 5, and the output shaft of the engine 5 is connected to the upper pulley. 6. Fixed Connection; The hydraulic motor 22 assembly includes connecting seats fixedly installed at both ends of the upper part of the chassis. A linkage sleeve 23 is fixedly installed at the upper end of the connecting seat, and the hydraulic motor 22 is fixedly connected to the inner end of the linkage sleeve 23. A spline shaft 31 is rotatably connected inside the linkage sleeve 23 through two bearings 30. The spline shaft 31 is connected to the output shaft of the hydraulic motor 22 through a spline. The outer end of the spline shaft 31 is connected to the upper pulley 6 through a flat key 32. The spline shaft 31 is also provided with a keyway. The inner side of the upper pulley 6 is provided with a keyway. A flat key 32 is placed in the middle of the keyway to make the upper pulley 6 and the spline shaft 31 rotate synchronously. The rotary support assembly includes a rotary assembly 4 installed on the upper part of the upper chassis 1. A center joint 3 is provided at the center of the 4. The hydraulic motor 22 is connected to the drain pipe 21 and the inlet and return pipes 28, which are connected to the center joint 3. The machine housing includes an upper machine housing 1 with a horizontally extending long rectangular box structure. The slewing support assembly includes a slewing assembly 4 located on the upper part of the upper machine housing 1. A center joint 3 is provided at the center of the slewing assembly 4. An upper support 2 is fixedly installed on the upper part of the slewing assembly 4. The machine housing includes a lower machine housing 19 fixedly installed at the lower ends of both ends of the upper machine housing 1. Shock absorbers 18 are provided at the four corners of the lower end of the lower machine housing 19, and tamping supports are connected through the shock absorbers 18. A central tube is provided in the middle of the tamping support, and side tubes 11 are provided at both ends of the tamping support. An eccentric belt pulley 7 can be used to... The outer end of the middle tube is installed in a relatively rotatable manner. The other end of the middle tube is also rotatably provided with an eccentric block 16. The eccentric block 16 is correspondingly provided with the belt eccentric pulley 13 and rotates synchronously. The two ends of the side tube 11 are fixedly connected with tamping picks. The tamping picks include a pick sleeve 17 fixedly connected to the side tube 11. The pick sleeve 17 is detachably installed with a pick rod 15. The lower end of the pick rod 15 is fixedly provided with a pick head 14. A guard plate 29 is provided on the outer surface of the pick rod 15. The two ends of the side tube 11 are also fixedly connected with adjusting rods 10. The upper ends of the two adjusting rods 10 on the same side are hinged to the two ends of the same oil cylinder 9. The upper end of the adjusting rod 10 is provided with a grease inlet 24 for injecting grease into the hinge between the adjusting rod 10 and the oil cylinder 9.It also includes a connecting rod 12, whose two ends are respectively hinged to two adjusting rods 10 located on the same side. The hinge point of the connecting rod 12 with the left adjusting rod 10 is located at the upper part of the adjusting rod 10, and the hinge point of the connecting rod 12 with the right adjusting rod 10 is located at the lower end of the adjusting rod 10. The hydraulic cylinder 9 is connected to the center joint 3 through the hydraulic pipeline 8. When the hydraulic cylinder 9 extends or retracts, the connecting rod 12 keeps the two adjusting rods 10 rotating synchronously. A tensioning bracket is also fixedly installed at the end of the upper housing 1. A tensioning shaft is rotatably connected to the tensioning bracket. A pull rod is fixedly connected to the end of the tensioning shaft. A tensioning wheel 20 is rotatably installed at the end of the pull rod. A torsion spring is also installed on the tensioning bracket and applies a force to the pull rod to make it rotate clockwise. The tensioning wheel 20 is coupled to the belt 7.

[0022] The first embodiment of this utility model is as follows: This application proposes a double-head tamping machine including a chassis. The upper part of the chassis is equipped with a slewing bracket assembly for connecting to an excavator, and self-driven tamping assemblies are symmetrically arranged at both ends. The self-driven tamping assembly includes an engine 5 and a tamping device. A pulley 6 is mounted on the output shaft of the engine 5, and the tamping device includes a belt eccentric pulley 13. The two are connected by a belt 7 to achieve power transmission.

[0023] The chassis refers to the basic frame that supports all functional modules. Specifically, it can be a box-type structure formed by welded steel plates, used to install the slewing bracket and engine 5. The slewing bracket assembly is the interface device that connects the excavator and enables rotation. It includes two relatively rotatable parts, one fixedly connected to the chassis and the other fixedly connected to the upper support 2, allowing the equipment to rotate horizontally. The self-driven tamping assembly is an independently driven working unit, which can be arranged in a split configuration. Each unit contains an independent engine 5 and a vibration generator. The belt eccentric pulley 13 is the core component that generates centrifugal vibration. Periodic excitation force is generated through the eccentric block 16 and the belt eccentric pulley 13. The eccentric block 16 and the belt eccentric pulley 13 are integrally formed, and their centers of gravity offset directions are the same, ensuring resonance.

[0024] Specifically, two self-driven tamping units are symmetrically arranged at both ends of the machine housing, each equipped with an independent engine 5 as its power source. The output shaft of the engine 5 drives the belt eccentric pulley 13 and eccentric block 16 to rotate at high speed via belt 7, and the resulting centrifugal force is converted into vertical vibration energy. The slewing bracket assembly allows the entire device to rotate around a vertical axis, facilitating the adjustment of the working angle. When the equipment is working, the tamping devices on both sides can simultaneously compact both sides of the track without repeatedly moving the equipment.

[0025] Compared to existing technologies, the dual-station synchronous operation design overcomes the efficiency bottleneck of single-sided tamping, and the rotary mechanism enhances the equipment's adaptability in confined spaces. The direct drive scheme eliminates the complex transmission chain, effectively reducing energy loss. The symmetrically arranged independent power units avoid the risk of system-wide downtime due to single-point failures, improving equipment reliability.

[0026] Through the above technical solution, this application achieves simultaneous tamping operations on both sides of the track, significantly improving construction efficiency. The independently driven dual-station design allows the equipment to adapt to different working environments, and the rotary mechanism enhances operational flexibility. The direct belt drive simplifies the mechanical structure and reduces maintenance costs.

[0027] This application further proposes an upper chassis 1 comprising a horizontally extending elongated rectangular box structure, and a slewing support assembly comprising a slewing assembly 4 disposed at the upper center of the upper chassis 1, with a center joint 3 disposed at the center of the slewing assembly 4; an upper support 2 is fixedly disposed on the upper part of the slewing assembly 4, and can be connected to the stick of the excavator through the upper support 2.

[0028] The elongated rectangular box structure refers to a box extending laterally with a rectangular cross-section. This can be achieved by welding steel plates to form a closed cavity structure. This structure provides a stable installation foundation for symmetrically distributed self-driving tamping components and a uniform bearing surface for these components, preventing equipment tilting due to a shift in the center of gravity. The slewing assembly 4 is the component that enables the rotatable connection between the chassis and the upper support 2. The center joint 3 is a hydraulic pipeline 8 connection device located at the rotation axis of the slewing assembly 4. It maintains continuous hydraulic power transmission during chassis rotation, achieving uninterrupted hydraulic circuit connectivity during dynamic rotation through an internal rotating sealing ring.

[0029] Compared with existing technologies, traditional tamping machines often employ asymmetrical or split designs for their casings, resulting in insufficient equipment stability and complex rotary mechanisms. This solution, through a combination of a long rectangular casing and a rotary assembly 4, achieves a symmetrical layout of the dual-head tamping components and simplifies the complexity of the rotary drive mechanism. Furthermore, the integrated design of the center connector 3 avoids the problem of tangling external hydraulic lines 8.

[0030] Through the above technical solution, this application effectively improves the connection stability between the tamping machine and the excavator arm, ensures the reliability of power transmission of the double-head tamping component during rotational operation, and reduces the complexity of equipment maintenance through the integrated box structure, enabling the device to adapt to the needs of high-frequency, multi-angle railway track tamping operations.

[0031] This application further proposes a lower casing 19 fixedly installed at the lower ends of both ends of the upper casing 1. Shock-absorbing blocks 18 are provided at the four corners of the lower end of the lower casing 19, and tamping supports are connected through the shock-absorbing blocks 18. A central tube is provided in the middle of the tamping support, and side tubes 11 are provided at both ends of the tamping support. An eccentric belt pulley 7 is installed on the outer end of the central tube in a relatively rotatable manner. Tamping picks are fixedly connected to both ends of the side tubes 11.

[0032] The damping block 18 is a buffer element placed between the chassis and the tamping device. It can be implemented using a spherical elastomer made of rubber, allowing for flexible connections to ensure the tamping device's vibration is maintained. The tamping support is the main frame supporting the tamping device, which can be implemented using a truss structure formed by welded steel pipes. The central pipe serves as the axial support for vibration transmission, while the side pipes 11 are used to fix the tamping pick and form a symmetrical working surface. The eccentric belt pulley 7 is a transmission wheel with an eccentric mass, which can be made of cast iron and machined into an eccentric structure. Its rotation generates periodic centrifugal force to drive the tamping pick to produce an impact action.

[0033] Specifically, the lower tamping unit 19 is fixed below the end of the upper tamping unit 1, and four shock absorbers 18 are respectively installed at the four corners of the bottom of the lower tamping unit 19. The tamping support is flexibly connected to the lower tamping unit 19 through the shock absorbers 18. The central tube runs horizontally through the middle of the tamping support, and eccentric belt pulleys 7 and eccentric blocks 16 are installed at its outer ends through bearings 30. The eccentric belt pulleys 7 are linked to the output shaft of the engine 5 through belts 7. The side tubes 11 are welded to both ends of the tamping support, and the ends are connected to the tamping pick assembly through bearings 30. When the engine 5 drives the eccentric belt pulleys 7 to rotate, the centrifugal force generated by the eccentric mass is transmitted to the side tubes 11 through the central tube, causing the tamping pick to generate high-frequency vibration to impact the ballast.

[0034] Compared to existing technologies, traditional tamping devices are directly fixed to the machine housing, causing vibrations to be transmitted to the excavator boom. This solution, however, uses damping blocks 18 to form a flexible connection structure, effectively isolating vibration energy while ensuring the tamping device can vibrate to the maximum extent. Existing single-head tampers require repeated adjustments to the equipment position for dual-side operation, while this solution employs symmetrically distributed side tubes 11 and tamping picks, enabling simultaneous tamping operations on both sides of the track.

[0035] Through the above technical solution, this application realizes synchronous tamping operation at two workstations, significantly improving railway maintenance efficiency. The design of the damping block 18 and the tamping support reduces unnecessary vibration amplitude during the operation of the upper equipment, extends the service life of key components, and ensures the necessary vibration amplitude of the lower tamping support, thereby improving the tamping effect. The direct transmission structure between the eccentric belt pulley 7 and the center tube simplifies the power transmission path, enabling vibration energy to be more efficiently converted into the impact kinetic energy of the tamping pick.

[0036] This application further proposes a tamping pick including a pick sleeve 17 fixedly connected to the side tube 11, with a pick rod 15 detachably installed inside the pick sleeve 17, and a pick head 14 fixedly provided at the lower end of the pick rod 15.

[0037] The tamping sleeve 17 is a mounting base used to fix the main structure of the tamping pick. It can be implemented using an externally open metal sleeve, providing a stable mounting position for the tamping rod 15 while allowing for disassembly and maintenance. The tamping rod 15 is the core component for transmitting vibration force. It can be implemented using a columnar metal rod, which is inserted into the tamping sleeve 17. Two bolts and nuts are then installed on the outside of the tamping sleeve 17. After tightening, the tamping rod 15 is fixed inside the tamping sleeve 17, bearing high-frequency impact loads during operation. The tamping head 14 is the working end that directly contacts the ballast. It can be made of a high-hardness alloy material and is fixed to the end of the tamping rod 15 by welding. The tamping head 14 and the tamping rod 15 are a single piece made of high-strength steel, used to transmit vibration force to the ballast for tamping.

[0038] Specifically, engine 5 drives belt eccentric pulley 13 and eccentric block 16 to rotate via upper pulley 6 and belt 7. The resulting vibration is transmitted to side pipe 11 through tamping bracket, ultimately driving the tamping pick to perform reciprocating impact. The pick shaft 15 bears the periodic impact load during operation, while the pick head 14 directly contacts the ballast to complete the tamping action. When the pick shaft 15 needs replacement due to wear, it can be detached from the pick sleeve 17 by removing bolt 33, and then a new component can be installed to restore operational capability. This split structure avoids the problem of the traditional one-piece tamping pick becoming unusable as a whole.

[0039] Compared to existing technologies, traditional tamping picks are typically manufactured using welding or integral casting, requiring complete replacement of the pick head 14 after wear, resulting in high maintenance costs and time consumption. This solution utilizes a detachable pick shaft 15 and pick sleeve 17, allowing maintenance to be completed by replacing only worn parts, significantly reducing equipment downtime. Simultaneously, the connection method between the pick shaft 15 and pick sleeve 17 ensures efficient vibration transmission and prevents energy loss due to loose connections.

[0040] Through the above technical solution, this application achieves a modular design for the tamping pick components, significantly reducing maintenance difficulty and material consumption while ensuring the stability of tamping operations. The severely worn pick head 14 can be replaced individually during operation without disassembling the entire tamping pick structure, effectively improving equipment maintenance efficiency and adapting to the high-frequency, short-cycle operation requirements of daily railway maintenance.

[0041] This application further proposes that the two ends of the side tube 11 are also fixedly connected to adjusting rods 10, and the upper ends of the two adjusting rods 10 located on the same side are hinged to the two ends of the same oil cylinder 9.

[0042] The adjusting rod 10 is a rod-shaped structure connected to both ends of the side tube 11, used to transmit mechanical force and adjust the angle. It can be made of high-strength metal material. The hydraulic cylinder 9 is a hydraulic drive device that achieves height or angle adjustment through telescopic movement. The hinge refers to a rotational connection achieved through a pin. Specifically, it can use a bolt 33 or a structure with a pin and bushing to form a rotatable linkage between the adjusting rod 10 and the hydraulic cylinder 9. The adjusting rod 10 and the pick sleeve 17 are integrally formed structures, with the pick sleeve 17 located at the lower end of the adjusting rod 10.

[0043] Specifically, the two ends of the hydraulic cylinder 9 are hinged to the upper ends of the two adjusting rods 10 on the same side. When the hydraulic system drives the hydraulic cylinder 9 to extend or retract, the hinged structure causes the two adjusting rods 10 to rotate synchronously. For example, when the hydraulic cylinder 9 extends, it pushes the two adjusting rods 10 to unfold outward, and when the hydraulic cylinder 9 retracts, it pulls the adjusting rods 10 to retract inward.

[0044] This application further proposes a connecting rod 12, with both ends of the connecting rod 12 respectively connected to two adjusting rods 10 located on the same side in a hinged manner. The hinge point between the connecting rod 12 and the left adjusting rod 10 is located at the upper part of the adjusting rod 10, and the hinge point between the connecting rod 12 and the right adjusting rod 10 is located at the lower end of the adjusting rod 10, and the hinge point is located below the side tube 11. The hydraulic cylinder 9 is connected to the center joint 3 through the hydraulic pipeline 8. When the hydraulic cylinder 9 extends or retracts, the two adjusting rods 10 are kept rotating synchronously through the connecting rod 12.

[0045] The difference in hinge point position refers to the left hinge point being located at the upper part of the adjusting rod 10 while the right hinge point is located at the lower part, forming a symmetrical and opposite rotation trajectory. The hydraulic line 8 refers to the fluid transmission channel connecting the oil cylinder 9 and the center connector 3, achieving a continuous supply of hydraulic oil through the rotary sealing structure of the center connector 3.

[0046] Specifically, when the piston rod of the hydraulic cylinder 9 extends or retracts, the upper hinge point of the left adjusting rod 10 and the lower hinge point of the right adjusting rod 10 transmit torque through the connecting rod 12. The clockwise rotation of the left adjusting rod 10 synchronously drives the right adjusting rod 10 to rotate counterclockwise, thereby achieving symmetrical adjustment of the tilt angle of the two tampers. Hydraulic oil is continuously supplied to the hydraulic cylinder 9 through the rotary sealing structure of the center joint 3, ensuring that the hydraulic system is always in working condition during the rotation of the rotary support assembly.

[0047] It achieves precise synchronous control of the tamping pick's lifting action, solving the problems of low efficiency of manual operation and poor tamping quality caused by uneven force on both sides. At the same time, it reduces the complexity of the hydraulic system and reduces equipment maintenance costs. Through the differential transmission design of the connecting rod 12, the two adjusting rods 10 can complete the symmetrical angle adjustment in a single stroke of the oil cylinder 9, eliminating the need for repeated manual calibration.

[0048] Through the above technical solution, this application realizes the synchronous angle adjustment of the tamping picks on both sides of the tamping device, which effectively improves the symmetry and consistency of tamping operations in railway track maintenance, avoids the problem of ballast distribution deviation caused by uneven force on one side, and simplifies the control complexity of the hydraulic system through the mechanical linkage structure.

[0049] A tensioning bracket is also fixedly installed at the end of the upper housing 1. A tensioning shaft is connected to the tensioning bracket in a rotatable manner. A pull rod is fixedly connected to the end of the tensioning shaft. A tensioning wheel 20 is provided at the end of the pull rod in a rotatable manner. A torsion spring is also provided on the tensioning bracket and applies a force to the pull rod to make it rotate clockwise. The tensioning wheel 20 is coupled to the belt 7.

[0050] The tensioning bracket is a rigid structural component used to support the tensioning shaft. It can be installed at the end of the upper housing 1 by welding or bolts 33, and its function is to provide a stable rotational fulcrum for the tensioning shaft. The tensioning shaft is a cylindrical metal rod with a rotating function, which can be rotatably connected using bearings 30 or bushings, and is used to transmit the torque generated by the torsion spring. The tie rod is a rod-shaped component connecting the tensioning shaft and the tensioning wheel 20, and its function is to convert the rotational motion of the tensioning shaft into the displacement of the tensioning wheel 20. The tensioning wheel 20 is a rotating wheel with keyways on its surface, which adjusts the tension by contacting the belt 7. The torsion spring is a helical spring with elastic deformation capability, which can be made of spring steel. It applies a continuous rotational torque to the tie rod through preload, thereby maintaining the tension of the belt 7.

[0051] Specifically, when the engine 5 drives the pulley 6 to rotate, the belt 7 may loosen due to vibration or wear during operation. At this time, the torsion spring on the tensioning bracket pushes the tensioning pulley 20 towards the belt 7 via a tie rod, ensuring that the tensioning pulley 20 always presses against the belt 7. Under the action of the torsion spring, the tensioning shaft drives the tie rod to rotate clockwise, and the tensioning pulley 20 changes its contact position with the belt 7 as the tie rod moves, thus automatically compensating for changes in the length of the belt 7. During this process, the tensioning pulley 20 maintains dynamic contact with the belt 7, preventing slippage or detachment due to belt 7 loosening.

[0052] This solution, through the linkage design of torsion spring and tension wheel 20, can respond to changes in belt tension 7 in real time, and can achieve automatic adjustment without stopping the machine, significantly improving the continuous operation capability of the equipment.

[0053] Through the above technical solution, this application solves the problem of reduced transmission efficiency caused by vibration loosening of belt 7. By maintaining stable contact pressure between belt 7 and wheel body through elastic tensioning mechanism, the frequency of manual maintenance is reduced, and the tamping device is guaranteed to operate continuously and reliably under high-frequency vibration conditions.

[0054] This application further proposes that the other end of the central tube is provided with an eccentric block 16 in a rotatable manner, and the eccentric block 16 is correspondingly provided with the belt eccentric pulley 13 and rotates synchronously.

[0055] Here, eccentric block 16 refers to an unbalanced mass block installed on the rotating shaft, whose eccentric mass distribution can generate periodic centrifugal force. Synchronous rotation means that the rotational angular velocity and phase of eccentric block 16 and belt eccentric pulley 13 are consistent, and the center of gravity offset directions of the two are the same, ensuring stable resonance.

[0056] Specifically, when the engine 5 drives the pulley 6 to rotate, the belt 7 drives the belt eccentric pulley 13 to rotate. At this time, the eccentric block 16 corresponding to the belt eccentric pulley 13 rotates synchronously through the horizontal shaft inside the central tube. The two ends of the horizontal shaft are connected to the belt eccentric pulley 13 and the eccentric block 16, respectively. The centrifugal forces generated by the two eccentric masses are superimposed in the vertical direction to form a compound vibration, which also prevents unbalanced wear caused by unilateral eccentric vibration of the central tube. The resulting directional vibration energy is transmitted to the tamping support through the central tube, causing the tamping pick to produce an impact action perpendicular to the sleeper direction.

[0057] Through the above technical solution, this application solves the technical problems of force dispersion and low energy utilization in single-vibration-source tamping devices. The composite vibration generated by the synchronous rotation of the two eccentric bodies enables the tamping pick to obtain a stronger vertical impact force, significantly improving the tamping effect of a single operation under the same engine power. At the same time, the balanced vibration design reduces the risk of fatigue damage to the equipment support and extends the service life of key components.

[0058] This application further proposes that a belt guard plate 29 is also installed on the lower chassis 19, and the belt guard plate 29 is located on both sides of the eccentric block 16 and the belt eccentric pulley 13.

[0059] Among them, the belt guard 25 refers to the protective structure covering the outside of the transmission components. Specifically, it can be made of steel plate by stamping and fixed to the side of the lower housing 19 by bolts 33 or welding, in order to block external gravel or debris from entering the belt 7 transmission area or to prevent the operator from being injured.

[0060] Specifically, the belt guard 25 is positioned outside the upper pulley 6, covering the outer edge of the belt 7's transmission path. When the engine 5 drives the upper pulley 6 to rotate, the belt 7 drives the belt eccentric pulley 13 and eccentric block 16 to rotate synchronously. At this time, the belt guards 25 on both sides form a physical isolation barrier. Crushed stones or debris are blocked outside the guards during equipment operation, preventing them from entering the meshing area between the belt 7 and the pulley.

[0061] In some specific embodiments, the edges of the belt guard 25 may be provided with a bent and folded structure to enhance impact resistance, for example, by bending the two sides of the guard inward to form a U-shaped groove structure. An observation window may be provided on the surface of the guard, fitted with transparent polycarbonate material, to facilitate inspection of the wear condition of the belt 7.

[0062] Through the above technical solution, this application solves the problems of easy failure and high maintenance cost of traditional tamping machine vibration damping structure under high frequency vibration. By balancing the elasticity and durability of rubber material, it ensures that the tamping device stably transmits tamping force during continuous operation, while reducing the interference of vibration on the excavator hydraulic system, thereby improving tamping operation efficiency and equipment reliability.

[0063] The second embodiment of this utility model is as follows: This application proposes a double-head tamping machine including a chassis. The upper part of the chassis is equipped with a slewing bracket assembly for connecting to an excavator, and self-driven tamping assemblies are symmetrically arranged at both ends. The self-driven tamping assembly includes a hydraulic motor 22 and a tamping device. The output shaft of the hydraulic motor 22 is equipped with a pulley 6, and the tamping device includes a belt eccentric pulley 13. The two are connected by a belt 7 to achieve power transmission.

[0064] The chassis refers to the basic frame that supports all functional modules. Specifically, it can be a box-type structure formed by welded steel plates, used to install the slewing bracket and hydraulic motor 22. The slewing bracket assembly is the interface device that connects the excavator and enables rotation. It includes two relatively rotatable parts, one fixedly connected to the chassis and the other fixedly connected to the upper support 2, allowing the equipment to rotate horizontally. The self-driven tamping assembly is an independently driven working unit, which can be arranged in a split configuration. Each unit includes an independent engine 5 and a vibration generator. The belt eccentric pulley 13 is the core component that generates centrifugal vibration. Periodic excitation force is generated through the eccentric block 16 and the belt eccentric pulley 13. The eccentric block 16 and the belt eccentric pulley 13 are integrally formed, and their centers of gravity offset directions are the same, ensuring resonance.

[0065] Specifically, two self-driven tamping components are symmetrically arranged at both ends of the machine housing, each equipped with an independent hydraulic motor 22 as a power source. The output shaft of the hydraulic motor 22 drives the belt eccentric pulley 13 and eccentric block 16 to rotate at high speed via belt 7, and the resulting centrifugal force is converted into vertical vibration energy. The rotary support assembly allows the entire device to rotate around a vertical axis, facilitating the adjustment of the working angle. When the equipment is working, the tamping devices on both sides can simultaneously compact both sides of the track without repeatedly moving the equipment.

[0066] Compared to existing technologies, the dual-station synchronous operation design overcomes the efficiency bottleneck of single-sided tamping, and the slewing mechanism enhances the equipment's adaptability in confined spaces. The direct drive scheme eliminates the complex transmission chain, effectively reducing energy loss. The symmetrically arranged independent hydraulic motors 22 avoid the risk of system-wide downtime due to single-point failure, improving equipment reliability. The hydraulic motors 22 can be connected to the excavator's hydraulic system via a central connector, thereby improving overall integration.

[0067] Through the above technical solution, this application achieves simultaneous tamping operations on both sides of the track, significantly improving construction efficiency. The independently driven dual-station design allows the equipment to adapt to different working environments, and the rotary mechanism enhances operational flexibility. The direct belt drive simplifies the mechanical structure and reduces maintenance costs.

[0068] This application further proposes an upper chassis 1 comprising a horizontally extending elongated rectangular box structure, and a slewing support assembly comprising a slewing assembly 4 disposed at the upper center of the upper chassis 1, with a center joint 3 disposed at the center of the slewing assembly 4; an upper support 2 is fixedly disposed on the upper part of the slewing assembly 4, and can be connected to the stick of the excavator through the upper support 2.

[0069] The hydraulic motor 22 assembly includes connecting seats fixedly installed at both ends of the upper part of the housing. A linkage sleeve 23 is fixedly installed at the upper end of the connecting seat. The hydraulic motor 22 is fixedly connected to the inner end of the linkage sleeve 23. A spline shaft 31 is rotatably connected inside the linkage sleeve 23 through two bearings 30. The spline shaft 31 is connected to the output shaft of the hydraulic motor 22 through a spline. The outer end of the spline shaft 31 is connected to the upper pulley 6 via a keyway connection. The spline shaft 31 is also provided with a keyway, and the inner side of the upper pulley 6 is provided with a keyway. A flat key 32 is placed in the middle of the keyway to make the upper pulley 6 and the spline shaft 31 rotate synchronously. The slewing support assembly includes a slewing assembly 4 located on the upper part of the upper housing 1. A center joint 3 is located at the center of the slewing assembly 4. A hydraulic motor 22 is connected to an oil drain pipe 21 and an inlet / return oil pipe 28. The oil drain pipe 21 and the inlet / return oil pipe 28 are connected to the center joint 3. The elongated rectangular box structure refers to a box extending laterally with a rectangular cross-section. This can be achieved by welding steel plates to form a closed cavity structure. This structure provides a stable installation foundation for symmetrically distributed self-driving tamping components and a uniform bearing surface for these components, preventing equipment tilting due to a shift in the center of gravity. The slewing assembly 4 is the component that enables the rotatable connection between the chassis and the upper support 2. The center joint 3 is a hydraulic pipeline 8 connection device located at the rotation axis of the slewing assembly 4. It maintains continuous hydraulic power transmission during chassis rotation, achieving uninterrupted hydraulic circuit connectivity during dynamic rotation through an internal rotating sealing ring.

[0070] The hydraulic motor 22 is connected to the central connector via the unloading pipe and the inlet / return pipe 28, and then to the hydraulic system of the excavator, making it easier to control. It is also lighter than the engine 5, effectively reducing the overall weight of the machine. The output shaft of the hydraulic motor 22 is connected to the splined shaft 31 via a spline, ensuring a stable connection and outputting rotational power. It is then connected to the upper pulley 6 via a flat key 32, transmitting power to the upper pulley 6. The splined shaft 31 also has a keyway, and the inner side of the upper pulley 6 has a keyway. A flat key 32 is placed in the middle of the keyway to allow the upper pulley 6 and the splined shaft 31 to rotate synchronously. This also facilitates disassembly and replacement. The upper pulley 6 is mounted on the splined shaft 31 at its outer end using washers and bolts 33. Snap rings are provided on both sides of the two bearings 30 to secure them. A belt guard 25 is also provided on the outside of the hydraulic motor 22 and other connected structures. The belt guard 25 is connected to the chassis through the guard bracket 27, and serves to protect the hydraulic motor 22, the upper pulley 6 and the belt 7.

[0071] Compared with existing technologies, traditional tamping machines often employ asymmetrical or split designs for their casings, resulting in insufficient equipment stability and complex rotary mechanisms. This solution, through a combination of a long rectangular casing and a rotary assembly 4, achieves a symmetrical layout of the dual-head tamping components and simplifies the complexity of the rotary drive mechanism. Furthermore, the integrated design of the center connector 3 avoids the problem of tangling external hydraulic lines 8.

[0072] Through the above technical solution, this application effectively improves the connection stability between the tamping machine and the excavator arm, ensures the reliability of power transmission of the double-head tamping component during rotational operation, and reduces the complexity of equipment maintenance through the integrated box structure, enabling the device to adapt to the needs of high-frequency, multi-angle railway track tamping operations.

[0073] This application further proposes a lower casing 19 fixedly installed at the lower ends of both ends of the upper casing 1. Shock-absorbing blocks 18 are provided at the four corners of the lower end of the lower casing 19, and tamping supports are connected through the shock-absorbing blocks 18. A central tube is provided in the middle of the tamping support, and side tubes 11 are provided at both ends of the tamping support. An eccentric belt pulley 7 is installed on the outer end of the central tube in a relatively rotatable manner. Tamping picks are fixedly connected to both ends of the side tubes 11.

[0074] The damping block 18 is a buffer element placed between the chassis and the tamping device. It can be implemented using a spherical elastomer made of rubber, allowing for flexible connections to ensure the tamping device's vibration is maintained. The tamping support is the main frame supporting the tamping device, which can be implemented using a truss structure formed by welded steel pipes. The central pipe serves as the axial support for vibration transmission, while the side pipes 11 are used to fix the tamping pick and form a symmetrical working surface. The eccentric belt pulley 7 is a transmission wheel with an eccentric mass, which can be made of cast iron and machined into an eccentric structure. Its rotation generates periodic centrifugal force to drive the tamping pick to produce an impact action.

[0075] Specifically, the lower tamping unit 19 is fixed below the end of the upper tamping unit 1, and four shock absorbers 18 are respectively installed at the four corners of the bottom of the lower tamping unit 19. The tamping support is flexibly connected to the lower tamping unit 19 through the shock absorbers 18. The central tube runs horizontally through the middle of the tamping support, and eccentric belt pulleys 7 and eccentric blocks 16 are installed at its outer ends through bearings 30. The eccentric belt pulleys 7 are linked to the output shaft of the engine 5 through belts 7. The side tubes 11 are welded to both ends of the tamping support, and the ends are connected to the tamping pick assembly through bearings 30. When the engine 5 drives the eccentric belt pulleys 7 to rotate, the centrifugal force generated by the eccentric mass is transmitted to the side tubes 11 through the central tube, causing the tamping pick to generate high-frequency vibration to impact the ballast.

[0076] Compared to existing technologies, traditional tamping devices are directly fixed to the machine housing, causing vibrations to be transmitted to the excavator boom. This solution, however, uses damping blocks 18 to form a flexible connection structure, effectively isolating vibration energy while ensuring the tamping device can vibrate to the maximum extent. Existing single-head tampers require repeated adjustments to the equipment position for dual-side operation, while this solution employs symmetrically distributed side tubes 11 and tamping picks, enabling simultaneous tamping operations on both sides of the track.

[0077] Through the above technical solution, this application realizes synchronous tamping operation at two workstations, significantly improving railway maintenance efficiency. The design of the damping block 18 and the tamping support reduces unnecessary vibration amplitude during the operation of the upper equipment, extends the service life of key components, and ensures the necessary vibration amplitude of the lower tamping support, thereby improving the tamping effect. The direct transmission structure between the eccentric belt pulley 7 and the center tube simplifies the power transmission path, enabling vibration energy to be more efficiently converted into the impact kinetic energy of the tamping pick.

[0078] This application further proposes a tamping pick including a pick sleeve 17 fixedly connected to the side tube 11. The pick sleeve 17 has a detachable pick rod 15 installed inside. The lower end of the pick rod 15 is fixedly provided with a pick head 14. The outer side of the pick rod 15 is provided with a protective plate 29 to improve the service life of the pick rod 15 and also to improve the structural strength of the pick rod 15 and prevent it from bending due to force during the tamping process.

[0079] The tamping shaft 17 is a mounting base used to fix the main structure of the tamping pick. It can be implemented using an externally open metal sleeve, providing a stable mounting position for the tamping shaft 15 while allowing for disassembly and maintenance. The tamping shaft 15 is the core component for transmitting vibration force, and can be implemented using a columnar metal rod. It is inserted into the tamping shaft 17, and two bolts 33 and nuts are installed on the outside of the tamping shaft 17. After tightening, the tamping shaft 15 is fixed inside the tamping shaft 17 and can withstand high-frequency impact loads during operation. The tamping head 14 is the working end that directly contacts the ballast. It can be made of a high-hardness alloy material and is fixed to the end of the tamping shaft 15 by welding. The tamping head 14 and the tamping shaft 15 are a single piece made of high-strength steel, used to transmit vibration force to the ballast for tamping.

[0080] Specifically, engine 5 drives belt eccentric pulley 13 and eccentric block 16 to rotate via upper pulley 6 and belt 7. The resulting vibration is transmitted to side pipe 11 through tamping bracket, ultimately driving the tamping pick to perform reciprocating impact. The pick shaft 15 bears the periodic impact load during operation, while the pick head 14 directly contacts the ballast to complete the tamping action. When the pick shaft 15 needs replacement due to wear, it can be detached from the pick sleeve 17 by removing bolt 33, and then a new component can be installed to restore operational capability. This split structure avoids the problem of the traditional one-piece tamping pick becoming unusable as a whole.

[0081] Compared to existing technologies, traditional tamping picks are typically manufactured using welding or integral casting, requiring complete replacement of the pick head 14 after wear, resulting in high maintenance costs and time consumption. This solution utilizes a detachable pick shaft 15 and pick sleeve 17, allowing maintenance to be completed by replacing only worn parts, significantly reducing equipment downtime. Simultaneously, the connection method between the pick shaft 15 and pick sleeve 17 ensures efficient vibration transmission and prevents energy loss due to loose connections.

[0082] Through the above technical solution, this application achieves a modular design for the tamping pick components, significantly reducing maintenance difficulty and material consumption while ensuring the stability of tamping operations. The severely worn pick head 14 can be replaced individually during operation without disassembling the entire tamping pick structure, effectively improving equipment maintenance efficiency and adapting to the high-frequency, short-cycle operation requirements of daily railway maintenance.

[0083] This application further proposes that the two ends of the side tube 11 are also fixedly connected to the adjusting rods 10, the upper ends of the two adjusting rods 10 on the same side are hinged to the two ends of the same oil cylinder 9, and the upper end of the adjusting rod 10 is provided with a filling port 24 for injecting grease into the hinge of the adjusting rod 10 and the oil cylinder 9.

[0084] The adjusting rod 10 is a rod-shaped structure connected to both ends of the side tube 11, used to transmit mechanical force and adjust the angle. It can be made of high-strength metal material. The hydraulic cylinder 9 is a hydraulic drive device that achieves height or angle adjustment through telescopic movement. The hinge is a rotational connection achieved through a pin. Specifically, it can use a structure where a pin or bolt 33 cooperates with a bushing, so that the adjusting rod 10 and the hydraulic cylinder 9 form a rotatable linkage. The adjusting rod 10 and the pick sleeve 17 are integrally formed structures, with the pick sleeve 17 located at the lower end of the adjusting rod 10. The adjusting rod 10 is hinged to both ends of the oil cylinder 9 via a bushing, which means that the upper part of the adjusting rod 10 is provided with a connecting hole 26 to accommodate the bushing. A grease port 24 is provided at the upper end of the adjusting rod 10. The two ends of the grease port 24 are connected to the connecting hole 26 and the outside, respectively, so that grease can be added to the bushing from the outside to reduce wear and make it more durable. A plug is installed at the position where the grease port 24 is connected to the outside with an interference fit. Compared with the first embodiment, the thickness of the adjusting rod 10 is adaptively thickened to accommodate the grease port 24. At the same time, the positions of the connecting rod 12 and the oil cylinder 9 are also adaptively fine-tuned. The final structure of the fine-tuning ensures that the spatial position of the pick rod 15 is the same as that of the first embodiment.

[0085] Specifically, the two ends of the hydraulic cylinder 9 are hinged to the upper ends of the two adjusting rods 10 on the same side. When the hydraulic system drives the hydraulic cylinder 9 to extend or retract, the hinged structure causes the two adjusting rods 10 to rotate synchronously. For example, when the hydraulic cylinder 9 extends, it pushes the two adjusting rods 10 to unfold outward, and when the hydraulic cylinder 9 retracts, it pulls the adjusting rods 10 to retract inward.

[0086] This application further proposes a connecting rod 12, with both ends of the connecting rod 12 respectively connected to two adjusting rods 10 located on the same side in a hinged manner. The hinge point between the connecting rod 12 and the left adjusting rod 10 is located at the upper part of the adjusting rod 10, and the hinge point between the connecting rod 12 and the right adjusting rod 10 is located at the lower end of the adjusting rod 10, and the hinge point is located below the side tube 11. The hydraulic cylinder 9 is connected to the center joint 3 through the hydraulic pipeline 8. When the hydraulic cylinder 9 extends or retracts, the two adjusting rods 10 are kept rotating synchronously through the connecting rod 12.

[0087] The difference in hinge point position refers to the left hinge point being located at the upper part of the adjusting rod 10 while the right hinge point is located at the lower part, forming a symmetrical and opposite rotation trajectory. The hydraulic line 8 refers to the fluid transmission channel connecting the oil cylinder 9 and the center connector 3, achieving a continuous supply of hydraulic oil through the rotary sealing structure of the center connector 3.

[0088] Specifically, when the piston rod of the hydraulic cylinder 9 extends or retracts, the upper hinge point of the left adjusting rod 10 and the lower hinge point of the right adjusting rod 10 transmit torque through the connecting rod 12. The clockwise rotation of the left adjusting rod 10 synchronously drives the right adjusting rod 10 to rotate counterclockwise, thereby achieving symmetrical adjustment of the tilt angle of the two tampers. Hydraulic oil is continuously supplied to the hydraulic cylinder 9 through the rotary sealing structure of the center joint 3, ensuring that the hydraulic system is always in working condition during the rotation of the rotary support assembly.

[0089] It achieves precise synchronous control of the tamping pick's lifting action, solving the problems of low efficiency of manual operation and poor tamping quality caused by uneven force on both sides. At the same time, it reduces the complexity of the hydraulic system and reduces equipment maintenance costs. Through the differential transmission design of the connecting rod 12, the two adjusting rods 10 can complete the symmetrical angle adjustment in a single stroke of the oil cylinder 9, eliminating the need for repeated manual calibration.

[0090] Through the above technical solution, this application realizes the synchronous angle adjustment of the tamping picks on both sides of the tamping device, which effectively improves the symmetry and consistency of tamping operations in railway track maintenance, avoids the problem of ballast distribution deviation caused by uneven force on one side, and simplifies the control complexity of the hydraulic system through the mechanical linkage structure.

[0091] A tensioning bracket is also fixedly installed at the end of the upper housing 1. A tensioning shaft is connected to the tensioning bracket in a rotatable manner. A pull rod is fixedly connected to the end of the tensioning shaft. A tensioning wheel 20 is provided at the end of the pull rod in a rotatable manner. A torsion spring is also provided on the tensioning bracket and applies a force to the pull rod to make it rotate clockwise. The tensioning wheel 20 is coupled to the belt 7.

[0092] The tensioning bracket is a rigid structural component used to support the tensioning shaft. It can be installed at the end of the upper housing 1 by welding or bolts 33, and its function is to provide a stable rotational fulcrum for the tensioning shaft. The tensioning shaft is a cylindrical metal rod with a rotating function, which can be rotatably connected using bearings 30 or bushings, and is used to transmit the torque generated by the torsion spring. The tie rod is a rod-shaped component connecting the tensioning shaft and the tensioning wheel 20, and its function is to convert the rotational motion of the tensioning shaft into the displacement of the tensioning wheel 20. The tensioning wheel 20 is a rotating wheel with keyways on its surface, which adjusts the tension by contacting the belt 7. The torsion spring is a helical spring with elastic deformation capability, which can be made of spring steel. It applies a continuous rotational torque to the tie rod through preload, thereby maintaining the tension of the belt 7.

[0093] Specifically, when the engine 5 drives the pulley 6 to rotate, the belt 7 may loosen due to vibration or wear during operation. At this time, the torsion spring on the tensioning bracket pushes the tensioning pulley 20 towards the belt 7 via a tie rod, ensuring that the tensioning pulley 20 always presses against the belt 7. Under the action of the torsion spring, the tensioning shaft drives the tie rod to rotate clockwise, and the tensioning pulley 20 changes its contact position with the belt 7 as the tie rod moves, thus automatically compensating for changes in the length of the belt 7. During this process, the tensioning pulley 20 maintains dynamic contact with the belt 7, preventing slippage or detachment due to belt 7 loosening.

[0094] This solution, through the linkage design of torsion spring and tension wheel 20, can respond to changes in belt tension 7 in real time, and can achieve automatic adjustment without stopping the machine, significantly improving the continuous operation capability of the equipment.

[0095] Through the above technical solution, this application solves the problem of reduced transmission efficiency caused by vibration loosening of belt 7. By maintaining stable contact pressure between belt 7 and wheel body through elastic tensioning mechanism, the frequency of manual maintenance is reduced, and the tamping device is guaranteed to operate continuously and reliably under high-frequency vibration conditions.

[0096] This application further proposes that the other end of the central tube is provided with an eccentric block 16 in a rotatable manner, and the eccentric block 16 is correspondingly provided with the belt eccentric pulley 13 and rotates synchronously.

[0097] Here, eccentric block 16 refers to an unbalanced mass block installed on the rotating shaft, whose eccentric mass distribution can generate periodic centrifugal force. Synchronous rotation means that the rotational angular velocity and phase of eccentric block 16 and belt eccentric pulley 13 are consistent, and the center of gravity offset directions of the two are the same, ensuring stable resonance.

[0098] Specifically, when the engine 5 drives the pulley 6 to rotate, the belt 7 drives the belt eccentric pulley 13 to rotate. At this time, the eccentric block 16 corresponding to the belt eccentric pulley 13 rotates synchronously through the horizontal shaft inside the central tube. The two ends of the horizontal shaft are connected to the belt eccentric pulley 13 and the eccentric block 16, respectively. The centrifugal forces generated by the two eccentric masses are superimposed in the vertical direction to form a compound vibration, which also prevents unbalanced wear caused by unilateral eccentric vibration of the central tube. The resulting directional vibration energy is transmitted to the tamping support through the central tube, causing the tamping pick to produce an impact action perpendicular to the sleeper direction.

[0099] Through the above technical solution, this application solves the technical problems of force dispersion and low energy utilization in single-vibration-source tamping devices. The composite vibration generated by the synchronous rotation of the two eccentric bodies enables the tamping pick to obtain a stronger vertical impact force, significantly improving the tamping effect of a single operation under the same engine power. At the same time, the balanced vibration design reduces the risk of fatigue damage to the equipment support and extends the service life of key components.

[0100] This application further proposes that a belt guard 25 is also installed on the lower chassis 19, and the belt guard 25 is located on both sides of the eccentric block 16 and the belt eccentric pulley 13.

[0101] Among them, the belt guard 25 refers to the protective structure covering the outside of the transmission components. Specifically, it can be made of steel plate by stamping and fixed to the side of the lower housing 19 by bolts 33 or welding, and is used to prevent external gravel or debris from entering the belt 7 transmission area.

[0102] Specifically, the belt guard plates 29 are arranged on both sides of the space between the eccentric block 16 and the belt eccentric pulley 13, covering the outer edge area of ​​the belt 7 transmission path. When the engine 5 drives the upper pulley 6 to rotate, the belt 7 drives the belt eccentric pulley 13 and the eccentric block 16 to rotate synchronously. At this time, the belt guard plates 29 on both sides form a physical isolation barrier. Crushed stones or debris are blocked outside the guard plates 29 during equipment operation, preventing them from entering the meshing area between the belt 7 and the pulley, or preventing injury to the operator.

[0103] In some specific embodiments, the edges of the belt guard plate 29 may be provided with a bent and flanged structure to enhance impact resistance, for example, the two sides of the guard plate 29 may be bent inward to form a U-shaped groove structure. An observation window may be provided on the surface of the guard plate 29, which is inlaid with transparent polycarbonate material to facilitate inspection of the wear condition of the belt 7.

[0104] Through the above technical solution, this application solves the problems of easy failure and high maintenance cost of traditional tamping machine vibration damping structure under high frequency vibration. By balancing the elasticity and durability of rubber material, it ensures that the tamping device stably transmits tamping force during continuous operation, while reducing the interference of vibration on the excavator hydraulic system, thereby improving tamping operation efficiency and equipment reliability.

[0105] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A double-head tamping machine, characterized in that: The device includes a chassis, with a rotating support assembly on the upper part of the chassis for rotating the chassis. Two self-driven tamping assemblies are symmetrically arranged at both ends of the chassis. Each self-driven tamping assembly includes a drive device fixedly mounted on the upper part of the chassis and a tamping device mounted on the lower part of the chassis. An upper pulley is mounted on the output shaft of the drive device. The tamping device includes a belt eccentric pulley. The upper pulley and the belt eccentric pulley are connected by a belt. The vibration generated when the belt eccentric pulley rotates drives the tamping device to work.

2. The double-head tamping machine according to claim 1, characterized in that: The drive unit includes either an engine assembly or a hydraulic motor assembly.

3. The double-head tamping machine according to claim 2, characterized in that: The engine assembly includes an engine, the output shaft of which is fixedly connected to an upper pulley.

4. The double-head tamping machine according to claim 2, characterized in that: The hydraulic motor assembly includes connecting seats fixedly installed at both ends of the upper part of the chassis. A linkage sleeve is fixedly installed at the upper end of the connecting seat, and a hydraulic motor is fixedly connected to the inner end of the linkage sleeve. The internal structure of the linkage sleeve is rotatably connected to a splined shaft via two bearings, and the splined shaft is connected to the output shaft of the hydraulic motor via a spline. The outer end of the spline shaft is connected to the upper pulley by a sleeve connection. The spline shaft is also provided with a flat key. The inner side of the upper pulley is provided with a keyway that matches the flat key. The flat key and the keyway cooperate to make the upper pulley and the spline shaft rotate synchronously. The slewing support assembly includes a slewing assembly located on the upper part of the upper housing. A center joint is provided at the center of the slewing assembly. The hydraulic motor is connected to an oil drain pipe and an oil inlet / return pipe, which are connected to the center joint.

5. The double-head tamping machine according to claim 1, characterized in that: The chassis includes an upper chassis with a horizontally extending elongated rectangular box structure. The slewing bracket assembly includes a slewing assembly disposed on the upper part of the upper chassis, and a center joint is disposed at the center of the slewing assembly. An upper bracket is fixedly disposed on the upper part of the slewing assembly.

6. The double-head tamping machine according to claim 5, characterized in that: The chassis includes a lower chassis fixedly installed at the lower part of both ends of the upper chassis. Shock-absorbing blocks are installed at the four corners of the lower end of the lower chassis, and tamping supports are connected through the shock-absorbing blocks. A central tube is installed in the middle of the tamping support, and side tubes are installed at both ends of the tamping support. An eccentric pulley is installed on the outer end of the central tube in a rotatable manner. An eccentric block is also rotatably installed on the other end of the central tube. The eccentric block is correspondingly installed with the belt eccentric pulley and rotates synchronously. The two ends of the side tube are fixedly connected to tamping picks.

7. The double-head tamping machine according to claim 6, characterized in that: The tamping pick includes a pick sleeve that is fixedly connected to the side tube. The pick sleeve has a detachable pick rod installed inside. The lower end of the pick rod is fixedly provided with a pick head. A protective plate is provided on the outer side of the pick rod.

8. The double-head tamping machine according to claim 6, characterized in that: Adjusting rods are fixedly connected to both ends of the side tube. The upper ends of the two adjusting rods on the same side are hinged to both ends of the same oil cylinder. The upper end of the adjusting rod is provided with a grease inlet for injecting grease into the hinge between the adjusting rod and the oil cylinder.

9. The double-head tamping machine according to claim 8, characterized in that: It also includes a connecting rod, the two ends of which are respectively connected to two adjusting rods located on the same side in a hinged manner. The hinge point of the connecting rod with the left adjusting rod is located at the upper part of the adjusting rod, and the hinge point of the connecting rod with the right adjusting rod is located at the lower end of the adjusting rod. The hydraulic cylinder is connected to the center joint through a hydraulic pipeline. When the hydraulic cylinder extends or retracts, the two adjusting rods are kept rotating synchronously through the connecting rod.

10. The double-head tamping machine according to claim 6, characterized in that: A tensioning bracket is fixedly installed at the end of the upper chassis. A tensioning shaft is rotatably connected to the tensioning bracket. A pull rod is fixedly connected to the end of the tensioning shaft. A tensioning wheel is rotatably installed at the end of the pull rod. A torsion spring is also installed on the tensioning bracket and applies a force to the pull rod to rotate clockwise. The tensioning wheel is coupled to a belt.

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