Hydraulic track-lifting device and method of use thereof

Abstract

The present application relates to a kind of hydraulic track-laying device and its using method, relate to the laying and maintenance technical field of railway track, including handle rod, handle, reset spring, oil return valve, piston, oil cylinder, limiting nut, locking nut, adjusting screw rod, hydraulic power unit, rack and other parts composition, rack is equipped with two places with the rail jaw contact, and the rail jaw is applied to the upward force of rack hook portion, by rotating the hydraulic track-laying device along the vertical axis of rail, rack hook portion can be from the rail jaw disengagement state to contact state, without being through opening, closing to achieve the purpose of disengaging, sticking rail head, rack is a whole, and the force structure is more reasonable, and the strength is higher, and operation is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydraulic rail lifter and its use method, which is suitable for lifting rail operation of railway ballast track, monolithic track bed track and wide sleeper track, and relates to the field of railway track laying and maintenance; in particular, the present application relates to a hydraulic rail lifter. BACKGROUND

[0002] With the development of railway technology towards high speed, higher requirements are put forward for the smoothness of the track. At present, the methods for adjusting the smoothness of the track in the vertical direction mainly include: laying sand under the track bed, and adjusting the height of the track in the vertical direction, which is more suitable for ballast track; increasing or decreasing the gasket under the rail to adjust the smoothness of the rail in the vertical direction, which is more suitable for monolithic track bed track, wide sleeper track and can also be used for ballast track.

[0003] The rail lifter is a special tool for adjusting the smoothness of the track in the vertical direction, and is used for lifting the rail or the monolithic track bed in the track laying and maintenance of the railway track. The rail lifter has different types, but mainly includes a hydraulic rail lifter.

[0004] The whole machine of the hydraulic rail lifter in the prior art mainly consists of a hydraulic system (including a mobile or manual plunger pump, a hydraulic cylinder and a hydraulic circuit) and an execution component (such as a rail lifting wheel, a rail lifting plate and a rail lifting hook), and the hydraulic energy provided by the hydraulic system is used to drive the piston in the hydraulic cylinder to move, so as to drive the execution component to lift the appropriate part of the rail, so as to achieve the purpose of the rail lifting operation. The hydraulic rail lifter is also provided with an oil return valve for pressure relief of the hydraulic system after the operation is completed. A safety valve is generally provided for unloading when the load is overloaded.

[0005] The Chinese invention patent with the authorized announcement number CN 108589445 A discloses a hydraulic rail head lifter and its use method. As shown in the accompanying drawings, Figure 1 , 2The hydraulic rail head track-lifting device provided by the application comprises an oil tank 1 and a base 2, the oil tank 1 is arranged on the top of the base 2, the oil tank 1 is further provided with a refueling screw plug 9, the oil tank 1 can be observed to check whether the oil is sufficient after the refueling screw plug 9 is opened, the base 2 is further provided with a handle 10, the handle 10 is used to facilitate the staff to take and move, the oil tank 1 is connected with a press button 5, the base 2 is further provided with a manual oil return valve 6, the bottom of the base 2 is provided with a track-lifting structure, the track-lifting structure is a symmetrical double-oil-cylinder design, the design is a key point for solving the track-lifting operation in a small space in a wide sleeper area, on the one hand, the volume and weight of the whole machine are reduced, on the other hand, the unbalanced load condition of the existing track-lifting device is eliminated. Preferably, the track-lifting structure comprises a pair of symmetrically arranged track-lifting hooks 3, the hook heads of the two track-lifting hooks 3 are oppositely arranged, the track-lifting hooks 3 are provided with rotating shafts, the rotating shafts are connected with the oil tank 1, the inside of the track-lifting hooks 3 can be filled with hydraulic oil, the track-lifting hooks 3 are connected with the bottom of the base 2 through the rotating shafts, the track-lifting hooks 3 are rotated by 90° outwardly around the rotating shafts, each track-lifting hook 3 is connected with a hydraulic oil cylinder 4, the two hydraulic oil cylinders 4 are also symmetrically arranged, the piston end of the hydraulic oil cylinder 4 is connected with a rotatable foot 8, when the track-lifting hook 3 is flipped, the hydraulic oil cylinder 4 is switched between the vertical position and the horizontal position. The rotating shafts are provided with positioning structures, when the hydraulic oil cylinder 4 is located at the vertical position and the horizontal position, the positioning structures on the track-lifting hooks 3 can be positioned. The present track-lifting device is mainly used for track-lifting operation when the wide sleeper slab line is maintained and repaired, and can be applied to the track-lifting operation of the conventional line in cooperation with the protection bottom plate, and the symmetrical structure ensures the stability and safety of track-lifting. Combined with the drawings, the track-lifting device is placed as follows: the track-lifting hooks 3 on both sides of the track-lifting device are flipped to keep horizontal, the track-lifting device is placed on the steel rail 11, and the whole track-lifting device is located in the middle of the gap between the two wide sleepers 12. If the track-lifting device is not located in the middle of the gap, the hydraulic oil cylinder 4 cannot be flipped downward to the position. Combined with the drawings, Figure 3 , Figure 1 、 2 , the track-lifting hooks 3 are flipped to keep horizontal, the track-lifting device is placed on the steel rail 11, and the whole track-lifting device is located in the middle of the gap between the two wide sleepers 12. If the track-lifting device is not located in the middle of the gap, the hydraulic oil cylinder 4 cannot be flipped downward to the position. Combined with the drawings, Figure 1 、 2 , the track-lifting hooks 3 are flipped to keep horizontal, the track-lifting device is placed on the steel rail 11, and the whole track-lifting device is located in the middle of the gap between the two wide sleepers 12. If the track-lifting device is not located in the middle of the gap, the hydraulic oil cylinder 4 cannot be flipped downward to the position. Combined with the drawings,

[0006] The hydraulic track-lifting device and the use method thereof described in the application can make up for the deficiencies in the prior art and fill the gaps in the prior art. SUMMARY

[0007] The hydraulic track-lifting device and the method for using the same have the advantages of simple structure, easy and fast operation, stable track-lifting process and high carrying capacity.

[0008] Further, the hydraulic track-lifting device and the method for using the same can perform track-lifting operation when the distance between the rail bottom surface of the steel rail and the ballast bed is zero.

[0009] The above object of the present application is achieved by the following technical scheme.

[0010] The hydraulic track-lifting device comprises a handle rod, a handle, a return spring, an oil return valve, a piston, an oil cylinder, a limiting nut, a locking nut, an adjusting screw rod, a hydraulic power unit and a frame.

[0011] The frame is a basic part of the whole track-lifting device, and two groups of oil cylinders are mounted on the frame. During operation, the two groups of oil cylinders are arranged on the two sides of the steel rail. The frame is an integral body, and two frame hook parts which can contact the rail jaw and apply upward force to the rail jaw are arranged on the frame. The frame hook parts can be switched from the disengaged state to the contact state by rotating the hydraulic track-lifting device along the vertical shaft of the steel rail. Each frame hook part comprises a frame hook part vertical surface A, a frame hook part vertical surface B and a frame hook part inclined surface. The frame hook part vertical surfaces A on the two sides are symmetrically distributed with respect to the symmetry plane of the frame hook part vertical surface A. The frame hook part vertical surfaces B on the two sides are symmetrically distributed with respect to the symmetry plane of the frame hook part vertical surface B. When the symmetry plane of the frame hook part vertical surface A coincides with the longitudinal symmetry plane of the steel rail, there is a gap ≥0 between the frame hook part vertical surface A and the rail head. An included angle α exists between the frame hook part vertical surface A and the frame hook part vertical surface B, and the same included angle α exists between the symmetry plane of the frame hook part vertical surface A and the symmetry plane of the frame hook part vertical surface B. When the frame rotates by an included angle α around the vertical shaft of the steel rail, the symmetry plane of the frame hook part vertical surface B of the frame will coincide with the longitudinal symmetry plane of the steel rail, and there is a gap ≥0 between the frame hook part vertical surface B and the rail head. At the same time, the included angle of the two frame hook part inclined surfaces C is consistent with the included angle of the rail jaw of the steel rail.

[0012] The hydraulic power unit is mounted on the frame, and the handle rod is mounted on the hydraulic power unit. When the handle rod is shaken, the hydraulic power unit can input hydraulic oil into the oil cylinder. A safety valve for limiting the maximum pressure of the hydraulic system is arranged in the hydraulic power unit.

[0013] The oil cylinder is installed on the frame, the oil cylinder is installed with the piston, the lower end of the oil cylinder is installed with the limit nut, the lower end of the limit nut is provided with an outer cylindrical surface, the piston is driven by the hydraulic oil to output the track lifting force, the limit nut can limit the working stroke of the piston, the outer cylindrical surface of the lower end of the limit nut can limit the angle of rotation of the hydraulic track lifting device around the vertical shaft of the rail, and the correct contact position of the two frame hook parts with the rail jaw is ensured.

[0014] The oil cylinder is installed on the frame, the oil cylinder is installed with the piston, the lower end of the oil cylinder is installed with the limit nut, the lower end of the limit nut is provided with an outer cylindrical surface, the piston is driven by the hydraulic oil to output the track lifting force, the limit nut can limit the working stroke of the piston, the outer cylindrical surface of the lower end of the limit nut can limit the angle of rotation of the hydraulic track lifting device around the vertical shaft of the rail, and the correct contact position of the two frame hook parts with the rail jaw is ensured.

[0015] The lower end of the piston is installed with the locking nut and the adjusting screw, which are combined through threads, and they can be removed from the piston, the adjusting screw can be rotated out of the piston, the upper end of the locking nut is outwardly conical, matched with the inner conical surface of the lower end of the piston, and after the locking nut is tightened, the purpose of locking the piston and the adjusting screw is achieved.

[0016] The hydraulic track lifting device further comprises a handle, one end of the handle is slightly inclined upward, and the other end of the handle is slightly inclined downward, which meets the ergonomics requirement that the tiger mouth end is slightly higher than the little finger end when a person lifts heavy objects, so that the hydraulic track lifting device is more convenient to operate and carry.

[0017] As can be seen from the above, the hydraulic track lifting device provided by the present application has reasonable and compact structure, is safe and reliable, has high operation efficiency, is convenient to operate and carry, and has high freedom degree of adjustment range, and can especially perform track lifting operation under the working condition that the distance between the rail bottom surface and the track bed is zero. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the present application will be more apparent with reference to the accompanying drawings. It should be understood that these drawings are only schematic and are not drawn to scale, and are not intended to limit the scope of the present application. In the drawings:

[0019] Figure 1 is a hydraulic rail head track lifting device and a hydraulic rail head track lifting device in the prior art and its use method;

[0020] Figure 2 is a starting state of the use method of the hydraulic rail head track lifting device and its use method in the prior art;

[0021] Figure 3 is a working state of the use method of the hydraulic rail head track lifting device and its use method in the prior art;

[0022] Figure 4 is a front view of the hydraulic track lifting device and its use method according to the present application when the track lifting device is in the starting state of track lifting operation;

[0023] Figure 5 is a front view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a starting state of a rail lifting operation;

[0024] Figure 6 is a right view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a starting state of a rail lifting operation;

[0025] Figure 7 is a top view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a starting state of a rail lifting operation;

[0026] Figure 8 is a bottom view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a starting state of a rail lifting operation;

[0027] Figure 9 is a perspective view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a starting state of a rail lifting operation;

[0028] Figure 10 is a front view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0029] Figure 11 is a left view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0030] Figure 12 is a right view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0031] Figure 13 is a top view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0032] Figure 14 is a bottom view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0033] Figure 15 is a perspective view of the hydraulic rail lifter and method of use thereof according to the present application when the rail lifter is in a working state of a rail lifting operation;

[0034] Figure 16is a second main view of the hydraulic track-lifting device and its using method according to the present application when the track-lifting device is in the working state of track-lifting operation, the locking nut 180 and the adjusting screw rod 190 are removed, and the track-lifting operation can be performed under the condition that the distance between the rail bottom surface and the ballast bed is zero;

[0035] Figure 17 is a third main view of the hydraulic track-lifting device and its using method according to the present application when the track-lifting device is in the working state of track-lifting operation, the adjusting screw rod 190 is rotated out of the piston 150 by a distance, and then locked by the locking nut 180, and the track-lifting operation can be performed under the condition that the distance between the rail bottom surface and the ballast bed is large, or the track-lifting operation can be performed on the section where the distance between the rail bottom surface and the ballast bed is consistent, so as to reduce the idle stroke and improve the operation efficiency;

[0036] Figure 18 is a main view of the frame 210 of the hydraulic track-lifting device and its using method according to the present application, which expresses the geometric shape of the main view direction of the frame 210, and simultaneously expresses the positional relationship between the frame 210 and the rail 220 when the track-lifting device is in the initial state of track-lifting operation;

[0037] Figure 19 is a top view of the frame 210 of the hydraulic track-lifting device and its using method according to the present application, which expresses the geometric shape of the top view direction of the frame 210, and simultaneously expresses the hydraulic oil channel required by the arrangement of the hydraulic power unit 200 in the frame 210;

[0038] Figure 20 is a bottom view of the frame 210 of the hydraulic track-lifting device and its using method according to the present application;

[0039] Figure 21 is an exploded view of the hydraulic track-lifting device and its using method according to the present application; Figure 18 is a B-B sectional view;

[0040] Figure 22 is a schematic perspective view of the frame 210 of the hydraulic track-lifting device and its using method according to the present application.

[0041] Figure 23 is a schematic perspective view of the frame 210 of the hydraulic track-lifting device and its using method according to the present application, which expresses the structure of the frame hook part 2101.

[0042] The components and label list of the hydraulic track-lifting device and its using method according to the present application.

[0043]

[0044] DETAILED DESCRIPTION

[0045] The specific embodiments of the hydraulic track-lifting device and the method of using the same according to the present application are described in detail below with reference to the accompanying drawings. These descriptions are only descriptive and exemplary.

[0046] Figure 4 is a front view of a specific embodiment of a hydraulic track-lifting device and the method of using the same according to the present application. As shown in the figure, the hydraulic track-lifting device 100 mainly comprises a handle rod 110, a handle 120, a return spring 130, an oil return valve 140, a piston 150, an oil cylinder 160, a limit nut 170, a locking nut 180, an adjusting screw rod 190, a hydraulic power unit 200, a frame 210 and the like.

[0047] See Figure 4 , the hydraulic power unit 200 is installed on the frame 210, the handle rod 110 is installed on the hydraulic power unit 200, the hydraulic power unit 200 can input hydraulic oil into the oil cylinder 160 by shaking the handle rod 110, and a safety valve limiting the maximum pressure of the hydraulic system is arranged in the hydraulic power unit 200.

[0048] See Figure 17 , the oil cylinder 160 is installed on the frame 210, the piston 150 is installed in the oil cylinder 160, and the limit nut 170 is installed at the lower end of the oil cylinder 160. The piston 150 is driven by the hydraulic oil to output the lifting force, and the limit nut 170 can limit the working stroke of the piston 150.

[0049] See Figure 8 and Figure 14 , the oil cylinder 160 is installed on the frame 210, the piston 150 is installed in the oil cylinder 160, and the limit nut 170 is installed at the lower end of the oil cylinder 160. A section of external cylindrical surface is arranged at the lower end of the limit nut 170, and the external cylindrical surface at the lower end of the limit nut 170 can limit the angle of rotation of the hydraulic track-lifting device around the vertical shaft 2201 of the steel rail 220 by contacting the side surface of the rail bottom of the steel rail 220, thereby ensuring that the two frame hook parts 2101 are in the correct contact position with the rail jaw of the steel rail 220.

[0050] See Figure 10 , the oil return valve 140 is installed on the frame 210, and the piston 150 will be reset under the action of the return spring 130 by opening the oil return valve 140.

[0051] See Figure 16 , Figure 17 , the locking nut 180 and the adjusting screw rod 190 are installed at the lower end of the piston 150, they are combined by threads, they can be removed from the piston, the adjusting screw rod 190 can be rotated out of the piston 150, the upper end of the locking nut 180 is externally conical, matched with the internally conical lower end of the piston 150, and the purpose of locking the piston 150 and the adjusting screw rod 190 is achieved after tightening the locking nut 180.

[0052] The hydraulic rail lifter further comprises a handle 120, one end of which is slightly inclined upward and the other end of which is slightly inclined downward, in accordance with the ergonomic requirement that the tiger mouth is slightly higher than the little finger end when a person carries a heavy object. Through this arrangement, the hydraulic rail lifter is more convenient to operate and carry. In an optional embodiment, the handle 120 can be provided with a protective sleeve made of a suitable material and shape to increase comfort. Through this arrangement, the hydraulic rail lifter is more convenient to operate and carry.

[0053] See Figure 4 , Figure 10 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 The rack 210 is the base of the entire rail lifter. The rack 210 is a whole, and the lower part is provided with two rack hook parts 2101 which can contact the rail jaws of the rail 220 and exert an upward force on the rail jaws. Through rotation of the hydraulic rail lifter along the vertical axis 2201 of the rail, the rack hook parts 2101 can be brought from a state of disengagement from the rail jaws to a state of contact with the rail jaws. That is, from the state of Figure 4 to the state of Figure 10 . Each rack hook part 2101 comprises at least a rack hook part vertical surface A 21011, a rack hook part vertical surface B 21012 and a rack hook part inclined surface C 21013. The two rack hook part vertical surfaces A 21011 are symmetrically distributed with respect to the symmetry plane A of the rack hook part vertical surface A 21011. The two rack hook part vertical surfaces B 21012 are symmetrically distributed with respect to the symmetry plane B of the rack hook part vertical surface B 21012. See Figure 18 , when the symmetry plane A 210111 of the rack hook part vertical surface A coincides with the longitudinal symmetry plane 2202 of the rail, there is a gap δ ≥ 0 between the rack hook part vertical surface A 21011 and the rail head 220, and preferably the value of δ is in the range of 1-10 mm. See Figure 21 , there is an included angle α between the rack hook part vertical surface A 21011 and the rack hook part vertical surface B 21012, and for the same reason, there is also an included angle α between the symmetry plane A 210111 of the rack hook part vertical surface A and the symmetry plane B 210121 of the rack hook part vertical surface B. See Figure 22 , when the rack 210 rotates around the vertical axis 2201 of the rail by an included angle α, the symmetry plane B 210121 of the rack hook part vertical surface B of the rack 210 will coincide with the longitudinal symmetry plane 2202 of the rail, and there is a gap ε ≥ 0 between the rack hook part vertical surface B 21012 and the rail head 220, and preferably the value of ε is in the range of 1-10 mm. At the same time, the included angle of the two rack hook part inclined surfaces C 21013 is consistent with the included angle β of the rail jaws of the rail 220.

[0054] As can be seen from the above description, when the track lifting operation is performed, the operator only needs to adjust the symmetry plane 210111 of the rack hook vertical surface A of the hydraulic track lifting device 100 to be substantially coincident with the longitudinal symmetry plane 2202 of the rail 220, so as to place the rail head of the rail 220 between the two rack hook vertical surfaces A 21011, see Figure 4 、 Figure 18 . Then, the operator rotates the whole hydraulic track lifting device 100 around the vertical axis 2201 of the rail by an angle a, and the symmetry plane 210121 of the rack hook vertical surface B of the rack 210 will be coincident with the longitudinal symmetry plane 2202 of the rail, see Figure 14 . At this time, the outer cylindrical surface of the lower end of the limiting nut 170 is in contact with the rail bottom side surface of the rail 220, which just ensures that the angle of rotation of the hydraulic track lifting device around the vertical axis 2201 of the rail is a, and ensures that the two rack hooks 2101 are in the correct contact position with the rail jaw of the rail 220. Since there is a gap of ε≥0 between the rack hook vertical surface B 21012 and the rail head of the rail 220, the rail head of the rail 220 is clamped between the two rack hooks 2101. Since the included angle of the rack hook inclined surface C 21013 is consistent with the included angle of the rail jaw of the rail 220, which is β, the rack hook inclined surface C 21013 and the rail jaw of the rail 220 can better match, which is beneficial to the track lifting operation, see Figure 10 、 Figure 22 . See Figure 10 . When the handle lever 110 is shaken, the hydraulic power unit 200 can input hydraulic oil into the oil cylinder 160, and a safety valve for limiting the maximum pressure of the hydraulic system is arranged in the hydraulic power unit 200. When the track lifting load exceeds the rated track lifting force of the hydraulic track lifting device 100, the hydraulic system is unloaded, so as to protect the hydraulic track lifting device 100 and the line. Under normal load, the hydraulic oil drives the piston 150 in the oil cylinder 160 to extend outward, and the track bed 230 is used as the support to output the track lifting force. The limiting nut 170 can limit the working stroke of the piston 150. In particular, see Figure 16 、 Figure 17 . The lower end of the piston 150 is provided with a locking nut 180 and an adjusting screw 190, which are combined through threads. When they are removed from the piston, the hydraulic track lifting device 100 can perform the track lifting operation under the condition that the distance between the rail bottom surface and the track bed is small or zero. The adjusting screw 190 can be rotated out of the piston 150 by a certain length, the upper end of the locking nut 180 is outwardly tapered, and cooperates with the inner taper of the lower end of the piston 150. After the locking nut 180 is tightened, the piston 150 and the adjusting screw 190 are locked, so as to perform the track lifting operation under the condition that the distance between the rail bottom surface and the track bed is large, or to perform the track lifting operation on the section where the distance between the rail bottom surface and the track bed is consistent, so as to reduce the idle stroke and improve the operation efficiency. After the track lifting step is completed, see Figure 10The oil return valve 140 is installed on the frame 210. When the oil return valve 140 is opened, the piston 150 will be reset under the action of the reset spring 130. The operator rotates the hydraulic rail lifter 100 in the opposite direction by an angle α, and the hydraulic rail lifter 100 is restored to the Figure 4 state. The hydraulic rail lifter 100 is removed from the rail 220, and the rail lifting operation is completed.

[0055] The exemplary embodiments of the present application are described in detail with reference to the drawings. It is to be understood that the application is not intended to be limited to the specific details described herein. Equivalences or similar changes to the structure and features of the exemplary embodiments can be made without departing from the spirit and scope of the application, and these changes will also fall within the scope of the appended claims of the present application.

Claims

1. A hydraulic track lifter, characterized in that, The machine comprises a handle, lifting handle, return spring, return valve, piston, cylinder, limit nut, locking nut, adjusting screw, hydraulic power unit, and frame. The frame is a single unit with two hooks that can contact the rail jaws and apply an upward force to them. By rotating the hydraulic track lifter along the vertical axis of the rail, the hooks can move from a disengaged state to a contact state. Each hook includes at least hook face A, hook face B, and hook inclined face C. Hook faces A on both sides are symmetrically distributed with respect to hook face A, and hook faces B on both sides are symmetrically distributed with respect to hook face C. The symmetrical faces of the hook section B are symmetrically distributed. When the symmetrical face of the hook section A coincides with the longitudinal symmetrical face of the rail, there is a gap ≥ 0 between the hook section A and the rail head. There is an angle α between the hook section A and hook section B. Similarly, there is also the same angle α between the symmetrical faces of hook section A and hook section B. When the frame rotates around the vertical axis of the rail by an angle α, the symmetrical face of the hook section B will coincide with the longitudinal symmetrical face of the rail. There is a gap ≥ 0 between the hook section B and the rail head. At the same time, the angle between the two hook section inclined faces C is the same as the angle between the rail jaws.

2. The hydraulic track lifter as described in claim 1, characterized in that, The frame is the basic component of the entire track lifter, on which two sets of hydraulic cylinders are installed. During operation, the two sets of hydraulic cylinders are arranged on both sides of the rail.

3. The hydraulic track lifter as described in claim 1, characterized in that, A hydraulic cylinder is mounted on the frame, and a piston is installed in the cylinder. A limit nut is installed at the lower end of the cylinder. Driven by hydraulic oil, the piston outputs the lifting force. The limit nut limits the working stroke of the piston. The lower end of the limit nut has an outer cylindrical surface. By contacting the side of the bottom of the rail, the outer cylindrical surface of the lower end of the limit nut can limit the angle of rotation of the hydraulic track lifter around the vertical axis of the rail, ensuring that the hooks of the two frames maintain the correct contact position with the rail jaws.

4. The hydraulic track lifter as described in claim 1, characterized in that, One end of the handle is slightly tilted upwards, and the other end is slightly tilted downwards, which meets the ergonomic requirement that the tiger's mouth end is slightly higher than the little finger when a person lifts a heavy object.

5. The hydraulic track lifter as described in claim 1, characterized in that, The lower end of the piston is equipped with a locking nut and an adjusting screw, which are connected by threads. They can be removed from the piston, or the adjusting screw can be unscrewed out of the piston. The upper end of the locking nut is outwardly conical, which matches the inner conical shape of the lower end of the piston. Tightening the locking nut achieves the purpose of locking the piston and adjusting screw.

6. A method of using a hydraulic track lifter as described in any one of claims 1 to 5, characterized in that, include: 1) During track lifting operations, the operator only needs to adjust the symmetrical plane of the hook face A of the hydraulic track lifter frame to coincide with the longitudinal symmetrical plane of the rail. The rail head can then be placed between the two hook faces A of the frame. The operator then rotates the entire hydraulic track lifter around the vertical axis of the rail by an included angle α. The symmetrical plane of the hook face B of the frame will then coincide with the longitudinal symmetrical plane of the rail. At this time, the outer cylindrical surface of the lower end of the limit nut, through contact with the side of the rail bottom, ensures that the angle of rotation of the hydraulic track lifter around the vertical axis of the rail is α. This ensures that the two hook faces of the frame and the rail jaws of the rail maintain the correct contact position, and the rail head of the rail is locked between the two hook faces of the frame. The inclined surface C of the hook face of the frame can fit well with the rail jaws of the rail, which is beneficial to the track lifting operation. 2) Crank the handle lever, and the hydraulic power unit inputs hydraulic oil into the oil cylinder. Under normal load, the hydraulic oil drives the piston in the oil cylinder to extend outward, supporting the track bed and outputting the lifting force. The limit nut can limit the working stroke of the piston. When the load exceeds the rated lifting force of the hydraulic track lifter, the safety valve built into the hydraulic power unit will unload the hydraulic system to protect the hydraulic track lifter and the line. 3) After the track lifting step is completed, the return oil valve is installed on the frame. Open the return oil valve and the piston will be reset under the action of the return spring. Then the operator will rotate the hydraulic track lifter around the vertical axis of the rail in the opposite direction of rotation by an included angle α, and the hydraulic track lifter can be removed from the rail, thus completing one track lifting operation.

7. The method of using a hydraulic track lifter as described in claim 6, characterized in that, The lower end of the piston is equipped with a locking nut and an adjusting screw, which are connected by threads. They can be removed from the piston, so the hydraulic track lifter can perform track lifting operations when the distance between the bottom surface of the rail and the track bed is small or zero.

8. The method of using a hydraulic track lifter as described in claim 6, characterized in that, The lower end of the piston is equipped with a locking nut and an adjusting screw. They are connected by threads, allowing the adjusting screw to be unscrewed from the piston. After tightening the locking nut, the piston and adjusting screw can be locked. This allows for track lifting operations when the distance between the bottom surface of the rail and the track bed is large, or when track lifting operations are carried out on sections where the distance between the bottom surface of the rail and the track bed is relatively uniform, thus reducing the idle stroke of the piston.

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