Ballastless hydraulic track jack for metro track maintenance

Abstract

The invention discloses a ballastless hydraulic track jack for metro track maintenance, and belongs to the field of hydraulic track jacks, the ballastless hydraulic track jack for metro track maintenance comprises a machine tool base and propelling mechanisms symmetrically arranged on the two sides, the propelling mechanisms form a plurality of communicating groove sections through first side plates and second side plates, and racks and swing arms with barb parts are arranged on the outer sides of the propelling mechanisms; during operation, the gear and the rack are driven by the operating rod to perform transmission, the swing arm is inserted into the inner side of a steel rail through the arc-shaped groove section and then is lifted and tilted, and the reverse force of the rack and the swing arm is converted into the forward power of the base after the barb part hooks tightly, so that manual pushing is not needed, the physical output is greatly reduced, and the operation is convenient and fast; and the ballastless track operation requirements are met.

Description

Technical Field

[0001] This invention relates to the field of hydraulic track lifters, and more specifically, to a ballastless hydraulic track lifter for subway track maintenance. Background Technology

[0002] Hydraulic track jacks, as core specialized equipment in subway track maintenance, are mainly used to precisely lift rails to a preset height during track settlement and adjustment operations. This provides the necessary working space for subsequent tasks such as replacing rail pads and adjusting track elevation. Their operational efficiency, ease of operation, and labor-saving performance directly affect the overall quality and progress of track maintenance. Compared to traditional mechanical track jacks, hydraulic track jacks, with their advantages of high lifting force, stable operation, and compact structure, have been widely used in subway track maintenance operations.

[0003] Currently, there are many types of hydraulic track lifters available on the market for subway track maintenance, and related technologies are constantly being optimized and improved to enhance their operational performance. Existing improvements to hydraulic track lifters mainly focus on the lifting structure, such as optimizing the cylinder structure, improving the hydraulic control system, and adding lifting limit mechanisms. These improvements increase lifting force, optimize lifting accuracy, and enhance operational safety, thereby meeting the track lifting requirements under different working conditions.

[0004] However, in actual subway track maintenance operations, it has been found that existing hydraulic track lifters still have significant defects. The core problem lies in the unreasonable design of the machine base structure, and existing technologies have not made targeted improvements to the base structure. Specifically, the bases of existing hydraulic track lifters are mostly simple flat or fixed bracket structures, lacking active propulsion and positioning functions. During operation, workers need to first move the hydraulic track lifter to the preset working position outside the rail, and then manually and slowly insert the machine base and the lever on top of the hydraulic track lifter into the bottom of the rail, so that the top of the lever can be placed under the rail before the hydraulic cylinder can be activated to perform the lifting operation.

[0005] Because hydraulic track lifters are heavy and typically placed on track beds covered with gravel, the friction between the lifter's base and the track bed is significant. This makes manually inserting the hydraulic lifter into the bottom of the rails difficult, consuming considerable physical strength and impacting track maintenance efficiency. Furthermore, the frequent repetition of such high-intensity manual operations exacerbates lumbar muscle strain among workers, failing to meet the modern requirements of "high efficiency, labor-saving, and safe" subway track maintenance.

[0006] In summary, existing hydraulic track jacks for subway track maintenance suffer from drawbacks due to the lack of improvements to the base structure. These drawbacks include the need to manually insert the heavy hydraulic jack into the bottom of the rail during operation, resulting in significant physical exertion and reduced work efficiency. Consequently, they fail to fully meet the actual needs of efficient subway track maintenance. Therefore, optimizing and improving the base structure of hydraulic track jacks to address the aforementioned shortcomings has become a pressing technical issue for those skilled in the art. Consequently, we propose a ballastless hydraulic track jack for subway track maintenance to solve the aforementioned problems. Summary of the Invention

[0007] 1. Technical problems to be solved Existing hydraulic track jacks for subway track maintenance have shortcomings due to the lack of improvement in the base structure. These include the need to manually insert the heavy hydraulic track jack into the bottom of the rail during operation, resulting in significant physical exertion and reduced work efficiency. Therefore, they cannot fully meet the actual needs of efficient subway track maintenance. We have proposed a ballastless hydraulic track jack for subway track maintenance to solve the above-mentioned problems.

[0008] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0009] A ballastless hydraulic track jack for subway track maintenance includes a machine base and two propulsion mechanisms. The two propulsion mechanisms have the same structure and are symmetrically arranged on both sides of the machine base. Each propulsion mechanism includes a first side plate and a second side plate. The machine base is provided with an edge portion, a connecting seat portion, and a shaft seat portion. The first side plate is fixedly installed to the edge portion by screws, and the second side plate is fixedly installed to the connecting seat portion and the shaft seat portion by screws. A horizontal forward groove section, an arc-shaped lifting groove section, a horizontal backward groove section, and a falling groove section are formed between the first side plate and the second side plate. A rack and a swing arm are provided on the outer side of the horizontal forward groove section, and a set of barbs are provided on the swing arm. The rack and the swing arm are rotatably connected by a bolt. Bolts 2 and 3 are also rotatably connected to the rack and the swing arm respectively. Anti-detachment pulleys are rotatably connected to bolts 1, 2, and 3. The anti-detachment pulleys on bolts 1, 2, and 3 are all slidably connected to the inside of the horizontal forward groove section.

[0010] Furthermore, the base of the machine tool is rotatably connected to a connecting shaft, and the propulsion mechanism also includes a gear and a rotating sleeve. The two ends of the connecting shaft respectively extend to the outer side of the side plate at the corresponding position. The connection between the connecting shaft and the side plate is rotatably connected by a bearing. The gear and the rotating sleeve are fixedly installed on the ends of the connecting shaft at the corresponding positions, and the gear meshes with the rack.

[0011] Furthermore, a hydraulic cylinder and a lever are provided inside the base of the tool. Shaft end one and shaft end two are fixedly welded to the bottom sides of the hydraulic cylinder and the lever, respectively. The bottom of the hydraulic cylinder and the lever are rotatably connected inside the base of the tool through shaft end one and shaft end two, respectively. The telescopic rod end at the top of the hydraulic cylinder and the top end of the lever are rotatably connected by a pin.

[0012] Furthermore, the hydraulic cylinder is equipped with a control lever connector and a pressure relief valve, and a control lever is inserted into the control lever connector. Several control lever insertion holes are symmetrically opened on the rotating sleeve.

[0013] Furthermore, the horizontal forward groove section, the arc-shaped raising groove section, the horizontal retracting groove section, and the falling groove section are connected to each other, and the widths of the horizontal forward groove section, the arc-shaped raising groove section, the horizontal retracting groove section, and the falling groove section are equal. The widths of the rack and the swing arm are both greater than the width of the horizontal forward groove section, and the rack, the swing arm, and the bottom of the machine base are all on the same horizontal plane.

[0014] Furthermore, a steel rail is provided at the top of the lever, and the distance between the falling groove section and the arc-shaped raising groove section is greater than the width of the bottom of the steel rail.

[0015] 3. Beneficial Effects Compared with the prior art, the advantages of this invention are: (1) This solution, by adding symmetrical propulsion mechanisms on both sides of the machine base, utilizes the meshing transmission of gears and racks, the limiting effect of the hook part of the swing arm, and the guidance of the multi-segment connecting groove section to realize the active and stable movement of the machine base towards the bottom of the rail. It eliminates the need for manual pushing of the heavy machine base into the bottom of the rail, significantly reducing the physical exertion of the staff and avoiding lumbar muscle strain caused by long-term repetitive high-intensity operations. It perfectly meets the core requirements of modern subway track maintenance: "high efficiency, labor saving, and safety". (2) In this scheme, the symmetrically arranged propulsion mechanism on both sides ensures that the base of the machine is subjected to balanced force. With the anti-detachment pulley sliding limit in the groove section, the base of the machine moves smoothly without deviation. After the swing arm is guided by the arc-shaped raised groove section, its hook part can fit and hook tightly with the bottom of the rail. It can convert the backward force of the rack and swing arm moving synchronously into the forward force of the base of the machine, quickly complete the pushing action of the hydraulic track lifter, and make it more convenient to use. (3) This scheme has a reliable and adaptable structural design, is easy to operate and learn. The control lever can be flexibly switched to the plug-in position to realize the propulsion positioning and jacking operation respectively. The operation process is simple and clear, and no complicated training is required to get started. At the same time, the overall structure is compact and adaptable to the track bed environment of the subway ballastless track, and the operation stability and practicality are significantly improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating a usage scenario of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a schematic diagram of the separation structure of the propulsion mechanism of the present invention; Figure 5 This is a schematic diagram of the machine base structure of the present invention; Figure 6 This is a schematic diagram of the propulsion mechanism of the present invention; Figure 7 This is a schematic diagram of the disassembled propulsion mechanism of the present invention; Figure 8 This is a schematic diagram of the rack structure of the present invention.

[0017] Explanation of the labels in the diagram: 1. Propulsion mechanism; 2. Side plate one; 3. Side plate two; 4. Horizontal forward groove section; 5. Arc-shaped lifting groove section; 6. Horizontal backward groove section; 7. Falling groove section; 8. Rack; 9. Swing arm; 901. Hook section; 10. Bolt one; 11. Bolt two; 12. Bolt three; 13. Anti-detachment pulley; 14. Gear; 15. Rotating sleeve; 1501. Control lever insertion hole; 16. Connecting shaft; 17. Tool base; 1701. Edge part; 1702. Connecting seat part; 1703. Shaft seat part; 18. Hydraulic cylinder; 1801. Shaft end one; 1802. Control lever connector; 19. Lever; 1901. Shaft end two; 20. Pin; 21. Control lever; 22. Steel rails. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please see Figures 1-8 A ballastless hydraulic track jack for subway track maintenance includes a machine base 17 and two propulsion mechanisms 1. The two propulsion mechanisms 1 have the same structure and are symmetrically arranged on both sides of the machine base 17. Each propulsion mechanism 1 includes a first side plate 2 and a second side plate 3. The machine base 17 is provided with an edge portion 1701, a connecting seat portion 1702, and a shaft seat portion 1703. The first side plate 2 is fixedly installed with the edge portion 1701 by screws, and the second side plate 3 is fixedly installed with the connecting seat portion 1702 and the shaft seat portion 1703 by screws. A horizontal forward groove section 4, an arc-shaped lifting groove section 5, a horizontal backward groove section 6, and a falling groove section 7 are formed between the first side plate 2 and the second side plate 3. A rack 8 and a swing arm 9 are provided on the outer side of the horizontal forward groove section 4. A set of barbs 901 are provided on the swing arm 9. The rack 8 and the swing arm 9 are connected by a bolt 10. Bolt 2 11 and bolt 3 12 are also rotatably connected to the rack 8 and the swing arm 9 respectively. Anti-detachment pulleys 13 are rotatably connected to bolt 10, bolt 2 11 and bolt 3 12. The anti-detachment pulleys 13 on bolt 10, bolt 2 11 and bolt 3 12 are all slidably connected to the inside of the horizontal forward groove section 4. The machine base 17 is rotatably connected to a connecting shaft 16. The propulsion mechanism 1 also includes a gear 14 and a rotating sleeve 15. The two ends of the connecting shaft 16 pass through to the outside of the side plate 2 at the corresponding positions. The connection between the connecting shaft 16 and the side plate 2 is rotatably connected by a bearing. The gear 14 and the rotating sleeve 15 are fixedly installed on the ends of the connecting shaft 16 at the corresponding positions, and the gear 14 meshes with the rack 8. The machine base 17 is equipped with a hydraulic cylinder 18 and a lever 19. The bottom sides of the hydraulic cylinder 18 and the lever 19 are respectively fixedly welded with shaft end 1801 and shaft end 2901. The bottom of the hydraulic cylinder 18 and the lever 19 are rotatably connected inside the machine base 17 through shaft end 1801 and shaft end 2901, respectively. The telescopic rod end at the top of the hydraulic cylinder 18 and the top end of the lever 19 are rotatably connected by a pin 20. The hydraulic cylinder 18 is equipped with a control lever connector 1802 and a pressure relief valve, and a control lever 21 is inserted into the control lever connector 1802. Several control lever insertion holes 1501 are symmetrically opened on the rotating sleeve 15. The horizontal forward groove section 4, the arc-shaped lifting groove section 5, the horizontal backward groove section 6, and the falling groove section 7 are connected to each other, and the widths of the horizontal forward groove section 4, the arc-shaped lifting groove section 5, the horizontal backward groove section 6, and the falling groove section 7 are equal. The widths of the rack 8 and the swing arm 9 are both greater than the width of the horizontal forward groove section 4, and the rack 8, the swing arm 9, and the bottom of the machine base 17 are all on the same horizontal plane. A rail 22 is provided at the top of the lever 19, and the distance between the lowering trough section 7 and the arc-shaped raising trough section 5 is greater than the width of the bottom of the rail 22.

[0020] The working principle of this type of ballastless hydraulic track jack for subway track maintenance is as follows: Before the operation, the staff first used shovels to clean the track bed area at the bottom of the rail 22 in the maintenance area to ensure that the track bed area is flat, the hydraulic track lifter can be placed stably, and the distance between the bottom of the rail 22 and the top of the track bed area is not less than the distance between the top end of the lever 19 and the bottom of the tool base 17. Then the tool base 17 is placed stably on the track bed area outside the rail 22. Then take out the control lever 21 and insert it into the control lever insertion hole 1501 on the rotating sleeve 15. Swing the control lever 21 from top to bottom to drive the rotating sleeve 15 to rotate. Then, through the connection of the connecting shaft 16, the gears 14 of the propulsion mechanism 1 on both sides of the machine base 17 will rotate synchronously. Since the gears 14 on the connecting shaft 16 mesh with the rack 8, and the rack 8 and the swing arm 9 are limited on the horizontal forward groove section 4 by the anti-detachment pulleys 13 on the bolts 10, 11 and 12, the rotation of the gears 14 will drive the rack 8 and the swing arm 9 to move along the horizontal forward groove section 4 towards the rail 22. When the anti-detachment pulley 13 on bolt 10 is still on the horizontal forward groove section 4, and the anti-detachment pulley 13 on the swing arm 9 and bolt 3 12 gradually moves to the arc-shaped lifting groove section 5, under the guidance of its arc structure, the end of the swing arm 9 gradually rises until it is successfully inserted into the inner side of the rail 22 and naturally tilts up. Then, the control lever 21 is swung from bottom to top, driving the connecting shaft 16 and gear 14 to rotate in the opposite direction. This, in turn, is limited by the anti-detachment pulleys 13 on bolts 10 and 21, causing the rack 8 to move in the opposite direction along the horizontal forward groove 4. Furthermore, through bolts 10 on the horizontal forward groove 4 and bolts 312 on the horizontal backward groove 6, the naturally raised swing arm 9 moves in the opposite direction along the horizontal backward groove 6. At this time, the hook 901 at the corresponding position on the swing arm 9 can engage with the rail 22. The inner bottom is attached and hooked together. The limiting effect of the barb 901 is used to convert the backward trend of the rack 8 and the swing arm 9 into the moving power of the tool base 17 towards the rail 22. Since the propulsion mechanism 1 is symmetrically arranged on both sides of the tool base 17, the propulsion mechanism 1 on both sides can ensure that the tool base 17 is subjected to balanced force, so that the tool base 17 moves smoothly towards the bottom of the rail 22 until the tool base 17 moves to the bottom of the rail 22, and the top end of the lever 19 can be attached and padded on the bottom of the rail 22. Then pull out the control lever 21 and insert it into the control lever connector 1802 of the hydraulic cylinder 18. Start the hydraulic cylinder 18 by swinging the control lever 21. The telescopic rod of the hydraulic cylinder 18 extends and pushes the lever 19 to rotate around the pin 20. Then, the lever 19 lifts the rail 22 to the preset height to provide space for subsequent maintenance work. After the maintenance work is completed, open the pressure relief valve on the hydraulic cylinder 18 to allow the extension rod of the hydraulic cylinder 18 to slowly fall back, and the lever 19 will sink accordingly. The rail 22 will return to its original position. Continue to manually press the top end of the lever 19 to disengage the top end of the lever 19 from the bottom of the rail 22. At this time, reinsert the control lever 21 into the control lever socket 1501 and continue to swing the control lever 21 from bottom to top to reset the anti-detachment pulley 13 of the bolt 3 12 on the swing arm 9 along the lower groove section 7. Then, the machine base 17 can be pulled out from the bottom of the rail 22, completing the entire operation process.

[0021] Example 2: In view of the above embodiment 1, further description is provided, see reference Figure 3 The anti-detachment pulleys 13 on bolt 10 and bolt 21 are used to limit the reciprocating movement of rack 8 on horizontal forward groove 4. The anti-detachment pulleys 13 on bolt 10 and bolt 312 are first used to limit the movement of swing arm 9 along horizontal forward groove 4, then one end is raised and tilted along arc-shaped lifting groove 5, then it moves backward along horizontal retraction groove 6, and then it returns to the horizontal forward groove 4 along falling groove 7 to reset.

[0022] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A ballastless hydraulic track jack for subway track maintenance, comprising a machine base (17) and two propulsion mechanisms (1), characterized in that: The two propulsion mechanisms (1) have the same structure and are symmetrically arranged on both sides of the machine base (17). The propulsion mechanism (1) includes a side plate one (2) and a side plate two (3). The machine base (17) is provided with an edge part (1701), a connecting seat part (1702) and a shaft seat part (1703). The side plate one (2) is fixedly installed with the edge part (1701) by screws. The side plate two (3) is fixedly installed with the connecting seat part (1702) and the shaft seat part (1703) by screws. A horizontal forward groove section (4), an arc-shaped lifting groove section (5), a horizontal backward groove section (6) and a falling groove section (7) are formed between the side plate one (2) and the side plate two (3). A rack (8) and a swing arm (9) are provided on the outer side of the horizontal forward groove section (4), and a set of barbs (901) are provided on the swing arm (9). The rack (8) and the swing arm (9) are connected by a bolt (10) for rotation. Bolt (2) (11) and bolt (3) (12) are also rotatably connected on the rack (8) and the swing arm (9), respectively. Anti-detachment pulleys (13) are rotatably connected on bolt (10), bolt (2) (11) and bolt (3) (12). The anti-detachment pulleys (13) on bolt (10), bolt (2) (11) and bolt (3) (12) are all slidably connected to the inside of the horizontal forward groove section (4).

2. The ballastless hydraulic track jack for subway track maintenance according to claim 1, characterized in that: The machine base (17) is rotatably connected to a connecting shaft (16). The propulsion mechanism (1) also includes a gear (14) and a rotating sleeve (15). The two ends of the connecting shaft (16) pass through to the outside of the side plate (2) at the corresponding positions. The connection between the connecting shaft (16) and the side plate (2) is rotatably connected by a bearing. The gear (14) and the rotating sleeve (15) are fixedly installed on the ends of the connecting shaft (16) at the corresponding positions, and the gear (14) meshes with the rack (8).

3. A ballastless hydraulic track jack for subway track maintenance according to claim 2, characterized in that: The machine base (17) is equipped with a hydraulic cylinder (18) and a lever (19). The bottom sides of the hydraulic cylinder (18) and the lever (19) are respectively fixedly welded with shaft end one (1801) and shaft end two (1901). The bottom of the hydraulic cylinder (18) and the lever (19) are rotatably connected inside the machine base (17) through shaft end one (1801) and shaft end two (1901), respectively. The telescopic rod end at the top of the hydraulic cylinder (18) and the top end of the lever (19) are rotatably connected by a pin (20).

4. A ballastless hydraulic track jack for subway track maintenance according to claim 3, characterized in that: The hydraulic cylinder (18) is provided with a control lever connector (1802) and a pressure relief valve, and a control lever (21) is inserted into the control lever connector (1802). Several control lever holes (1501) are symmetrically opened on the rotating sleeve (15).

5. A ballastless hydraulic track jack for subway track maintenance according to claim 1, characterized in that: The horizontal forward groove section (4), the arc-shaped raising groove section (5), the horizontal backward groove section (6), and the falling groove section (7) are connected to each other, and the widths of the horizontal forward groove section (4), the arc-shaped raising groove section (5), the horizontal backward groove section (6), and the falling groove section (7) are equal. The widths of the rack (8) and the swing arm (9) are both greater than the width of the horizontal forward groove section (4), and the bottoms of the rack (8), the swing arm (9), and the machine base (17) are all on the same horizontal plane.

6. A ballastless hydraulic track jack for subway track maintenance according to claim 3, characterized in that: The top of the lever (19) is provided with a rail (22), and the distance between the falling groove section (7) and the arc-shaped raising groove section (5) is greater than the width of the bottom of the rail (22).

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