CN112620425A

CN112620425A - Hydraulic rail bender for rail transit

Info

Publication number: CN112620425A
Application number: CN202011402211.XA
Authority: CN
Inventors: 王铁柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-04-09

Abstract

The invention relates to the technical field of rail maintenance equipment and discloses a hydraulic rail bender for rail transit, which comprises a hydraulic oil cylinder, wherein the rear side of the hydraulic oil cylinder is fixedly connected with a rack, the right side inside the hydraulic oil cylinder is fixedly connected with a storage cylinder, an oil inlet valve is fixedly sleeved between the hydraulic oil cylinder and the storage cylinder, a stretching cylinder is fixedly connected inside the hydraulic oil cylinder on the left side of the storage cylinder, and a first one-way valve is fixedly sleeved between the storage cylinder and the stretching cylinder. The fixed magnet and the movable rod have the same magnetism and repel each other along with the pushing of the large piston, so that the liquid in the liquid storage cavity is extruded to increase the volume of the small rubber membrane, the purpose of reducing the effective contact area of the sealing element and the hydraulic oil is realized, the sealing element is always under lower working pressure when being subjected to larger impact force from the hydraulic oil, the abrasion of the sealing element is prevented, the service life of the sealing element is prolonged, and the sealing performance of the sealing element is enhanced.

Description

Hydraulic rail bender for rail transit

Technical Field

The invention relates to the technical field of rail maintenance equipment, in particular to a hydraulic rail bender for rail transit.

Background

The hydraulic rail bender is a tool device for bending or straightening steel rails during railway installation and maintenance, is designed and formed by using hydraulic transmission and a lever principle, and realizes the operation of bending or straightening the steel rails in a horizontal curve or a vertical curve by using static pressure. The hydraulic rail bender mainly comprises a hydraulic oil cylinder and a frame, wherein the hydraulic oil cylinder is an actuating element of a hydraulic transmission system, can convert hydraulic energy into mechanical energy and is used for driving a working mechanism to do linear reciprocating motion or reciprocating swing, and generally comprises a cylinder barrel and a piston rod assembly, and the piston rod assembly comprises a piston and a piston rod.

However, the hydraulic rail bender has some defects in the use process: the existing hydraulic rail bender drives a piston rod to move by continuously inputting hydraulic oil into a working oil cylinder, so that the piston rod extends out of a cylinder barrel to drive a working mechanism.

Disclosure of Invention

Aiming at the defects of the existing hydraulic rail bender in the background technology in the using process, the invention provides the hydraulic rail bender for rail transit, which has the advantages that the volume of a small rubber film is enlarged by the magnetic repulsion of a fixed magnet and a movable rod, so that the hydraulic pressure applied to a sealing element is effectively weakened, the service life of the sealing element is prolonged, the working efficiency of the sealing element is improved, and the technical problems in the background technology are solved.

The invention provides the following technical scheme: a hydraulic rail bender for rail transit comprises a hydraulic oil cylinder, wherein a rack is fixedly connected to the rear side of the hydraulic oil cylinder, the right side inside the hydraulic oil cylinder is fixedly connected with a storage cylinder, an oil inlet valve is fixedly sleeved between the hydraulic oil cylinder and the storage cylinder, a stretching cylinder is fixedly connected to the inside of the hydraulic oil cylinder on the left side of the storage cylinder, a first one-way valve is fixedly sleeved between the storage cylinder and the stretching cylinder, a working cylinder is fixedly connected to the left side of the stretching cylinder, a second one-way valve is fixedly sleeved between the stretching cylinder and the working cylinder, a hole is formed in the front side of the working cylinder and fixedly connected with an oil drain valve, the oil drain valve is fixedly connected with the front side of the storage cylinder, a large piston is movably sleeved inside the working cylinder, a sealing element is fixedly sleeved outside the large piston, the right side of the large piston is fixedly connected with a piston rod, and one end of the piston rod outside the, the large piston is fixedly connected with the inner wall of the working cylinder through a return spring, the hydraulic oil cylinder and the working cylinder are internally provided with a liquid storage cavity, one side of the liquid storage cavity close to the working cylinder is fixedly sleeved with a large rubber film, the inner side of the large rubber film is fixedly connected with a fixed block, the fixed block is internally provided with an elongated slot, the bottom end of the elongated slot is fixedly connected with one end of a main spring, the other end of the main spring is fixedly connected with the upper end of a movable rod, the lower end of the movable rod is fixedly connected with the movable block, the top ends of the movable blocks positioned at two sides of the movable rod are fixedly connected with an auxiliary spring, the auxiliary spring is fixedly connected with the bottom end of the fixed block, the right side of the liquid storage cavity is provided with a liquid guide cavity, one side of the liquid storage cavity close to the working cylinder is fixedly connected with a small rubber film, and the, the small rubber membrane is movably connected with the liquid passing plate through a return spring.

Preferably, be located the stock solution intracavity wall of big rubber membrane top is encircleed and is installed embedded magnet, the fixed block top is encircleed and is installed embedded piece, is located stock solution intracavity wall both sides of big rubber membrane below are seted up slottedly, and the inslot activity has cup jointed the outer magnet, the inboard and the groove of outer magnet pass through spring swing joint, the slot hole has been seted up to the below of movable block, and the inside activity of slot hole has cup jointed the inner magnet, two inner magnets pass through fixed spring fixed connection.

Preferably, the embedded magnet has N-type magnetism, the embedded block is made of iron, the outer magnet has N-type magnetism, the inner magnet has S-type magnetism, and the upper portion of the right side of the long hole of the movable block is arc-shaped.

Preferably, the liquid storage cavity and the liquid guide cavity are filled with liquid, and eight rows of small holes are formed in the liquid passing plate.

Preferably, the section of the fixed block is convex, the section of the movable block is concave, and the fixed block and the movable block are embedded and installed.

Preferably, a sealing nut is fixedly sleeved at a liquid storage cavity close to the outer side of the hydraulic oil cylinder, a screw rod is sleeved at the middle part of the sealing nut in a threaded manner, and a push plate is fixedly sleeved at the screw rod end in the liquid storage cavity.

Preferably, the liquid storage cavity and the drainage cavity are arranged in a surrounding manner in four groups in the same section, and the liquid storage cavity and the drainage cavity are arranged in three groups in the same plane and have the same interval in pairs.

Preferably, a fixed magnet is placed in the center of the inside of the sealing element, a spacing film is fixedly connected between the periphery of the fixed magnet and the inner wall of the sealing element, a spacing spring is fixedly connected to the fixed magnet inside the spacing film, the spacing spring is fixedly connected with the inner wall of the sealing element, liquid oil is filled in the sealing element space of the non-spacing film part, the fixed magnet has S-shaped magnetism, and the movable rod has S-shaped magnetism.

Preferably, the piston rod comprises a cylinder and a round platform, the round platform and the big piston fixed connection of piston rod, set up by the piston groove on the piston rod, and quantity be four, encircle the setting, be located the cylinder part the piston groove degree of depth department is the same, is located the round platform part the piston groove is along with the diameter increase of piston rod and the degree of depth reduces, and the piston groove degree of depth that is located the piston rod bottom is zero.

The invention has the following beneficial effects:

1. the fixed magnet and the movable rod have the same magnetism and repel each other along with the pushing of the large piston, so that the liquid in the liquid storage cavity is extruded to increase the volume of the small rubber membrane, the purpose of reducing the effective contact area of the sealing element and the hydraulic oil is realized, the sealing element is always under lower working pressure when being subjected to larger impact force from the hydraulic oil, the abrasion of the sealing element is prevented, the service life of the sealing element is prolonged, and the sealing performance of the sealing element is enhanced.

2. According to the invention, the large rubber membrane is arranged in the piston groove through the arrangement of the piston groove of the piston rod, so that the large rubber membrane is beneficial to fixedly supporting the piston rod, the piston rod is always positioned in the center of the working cylinder in the moving process, the radial force borne by the piston rod is unloaded by the large rubber membrane while supporting, the damage of the radial force of the large rubber membrane to the inner wall of the sealing element is effectively reduced, the piston rod is prevented from rotating due to the radial force, and the stability of the piston rod is enhanced.

3. The sealing element is pushed by hydraulic oil, so that the large rubber membrane and the movable block in the liquid storage cavity move, different effects are realized, different purposes are achieved, the stability of the piston rod is enhanced, the sealing property of the sealing element is improved, and the service life of the sealing element is prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of a portion of the structure A of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of a portion of the structure of FIG. 2;

FIG. 4 is an enlarged view of a portion of the structure shown at B in FIG. 1 according to the present invention;

FIG. 5 is an enlarged view of a portion of the structure of FIG. 1 at C according to the present invention;

FIG. 6 is a schematic view of the seal of the present invention;

FIG. 7 is a schematic sectional view of the piston rod according to the present invention;

fig. 8 is a schematic view of the overall structure of the piston rod according to the present invention.

In the figure: 1. a hydraulic cylinder; 11. a frame; 12. a storage tank; 13. an oil inlet valve; 14. a first check valve; 15. stretching the cylinder; 16. a second one-way valve; 17. an oil release valve; 2. a working cylinder; 21. a large piston; 22. a seal member; 23. a piston rod; 231. a piston groove; 24. ejecting the head; 25. a return spring; 3. fixing a magnet; 31. a blanking film; 32. a spacing spring; 33. a liquid oil; 4. a liquid storage cavity; 41. a magnet is embedded; 42. an external magnet; 5. a drainage cavity; 51. a small rubber film; 52. a liquid passing plate; 53. a return spring; 6. a large rubber membrane; 61. a fixed block; 62. a main spring; 63. a movable rod; 64. a secondary spring; 65. an embedded block; 7. a movable block; 71. an inner magnet; 72. fixing the spring; 8. a screw rod; 81. pushing the plate; 82. and sealing the nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, a hydraulic rail bender for rail transit comprises a hydraulic cylinder 1, a frame 11 fixedly connected to the rear side of the hydraulic cylinder 1, a storage cylinder 12 fixedly connected to the right side of the hydraulic cylinder 1, an oil inlet valve 13 fixedly sleeved between the hydraulic cylinder 1 and the storage cylinder 12, a stretching cylinder 15 fixedly connected to the interior of the hydraulic cylinder 1 on the left side of the storage cylinder 12, a first check valve 14 fixedly sleeved between the storage cylinder 12 and the stretching cylinder 15, a working cylinder 2 fixedly connected to the left side of the stretching cylinder 15, a second check valve 16 fixedly sleeved between the stretching cylinder 15 and the working cylinder 2, a hole formed in the front side of the working cylinder 2 and fixedly connected to an oil drain valve 17, the oil drain valve 17 fixedly connected to the front side of the storage cylinder 12, a large piston 21 movably sleeved inside the working cylinder 2, a sealing member 22 sleeved outside the large piston 21, and a piston rod 23 fixedly connected to the right side of the large piston 21, one end of a piston rod 23 positioned outside the working cylinder 2 is fixedly connected with a top 24, a large piston 21 is fixedly connected with the inner wall of the working cylinder 2 through a return spring 25, the inner parts of the hydraulic cylinder 1 and the working cylinder 2 are provided with groove walls which are provided with liquid storage cavities 4, one side of the liquid storage cavity 4 positioned near the working cylinder 2 is fixedly sleeved with a large rubber film 6, the inner side of the large rubber film 6 is fixedly connected with a fixed block 61, the inner part of the fixed block 61 is provided with a long groove, the bottom end of the long groove is fixedly connected with one end of a main spring 62, the other end of the main spring 62 is fixedly connected with the upper end of a movable rod 63, the lower end of the movable rod 63 is fixedly connected with a movable block 7, the top ends of the movable blocks 7 positioned at two sides of the movable rod 63 are fixedly connected with auxiliary springs 64, the auxiliary springs 64 are fixedly connected with the bottom end of the fixed block 61, the right side, the inner wall of the drainage cavity 5 positioned below the small rubber membrane 51 is fixedly sleeved with a liquid passing plate 52, and the small rubber membrane 51 is movably connected with the liquid passing plate 52 through a return spring 53.

Further, the inner wall of the liquid storage cavity 4 above the large rubber membrane 6 is surrounded by the embedded magnet 41, the embedded block 65 is surrounded by the fixed block 61, the two sides of the inner wall of the liquid storage cavity 4 below the large rubber membrane 6 are provided with grooves, the outer magnet 42 is sleeved in the grooves in the groove, the inner side of the outer magnet 42 is connected with the grooves through the spring in a movable manner, the long hole is formed in the lower portion of the movable block 7, the inner magnet 71 is sleeved in the long hole in the movable manner, and the two inner magnets 71 are fixedly connected through the fixed spring 72.

Further, the embedded magnet 41 has N-type magnetism, the embedded block 65 is made of iron, the large rubber membrane 6 can always keep a retraction state when retracted, the embedded magnet does not protrude into the working cylinder 2 to obstruct the movement of the large piston 21, meanwhile, the fixed block 61 is tightly attached to the inner wall of the liquid storage cavity 4 to prevent hydraulic oil in the working cylinder 2 from leaking, the outer magnet 42 has N-type magnetism, the inner magnet 71 has S-type magnetism, the outer magnet 42 and the inner magnet 71 can attract and clamp each other to enhance the supporting force of the fixed block 61 and the movable block 7 on the piston rod 23, the fixed block 61 is prevented from contracting due to the radial force applied to the piston rod 23, the upper portion of the right side of the long hole of the movable block 7 is arc-shaped, the inner magnet 71 on the right side has an upward offset space when the fixed block 61 receives the unbalanced force of the piston groove 231, so that the inner magnet 71 is separated from the outer magnet 42.

Further, be filled with liquid in stock solution chamber 4 and the drainage lumen 5, cross the inside of liquid board 52 and seted up eight rows of apertures, can make the liquid that is extruded in drainage lumen 5 get into little rubber membrane 51 fast in, make little rubber membrane 51 extend to reduce the hydraulic pressure force that sealing member 22 received, improve sealing member 22's life.

Furthermore, the section of the fixed block 61 is convex, the section of the movable block 7 is concave, and the fixed block 61 and the movable block 7 are embedded and installed, so that the fixed block 61 and the movable block 7 are more stable in the movement process and prevented from being separated.

Further, be close to the fixed sealing nut 82 that has cup jointed in liquid storage cavity 4 outside of hydraulic cylinder 1, sealing nut 82's middle part screw thread has cup jointed the hob 8, and the hob 8 that is located in liquid storage cavity 4 is fixed to be cup jointed the push pedal 81, can confirm the distance that movable block 7 moved to the outside, can promote big rubber membrane 6 to move to the inside center of working cylinder 2 simultaneously to reach support piston rod 23, weaken the purpose of the radial force of piston rod 23.

Furthermore, four groups of liquid storage cavities 4 and liquid guide cavities 5 are arranged in the same section and are arranged in a surrounding mode, three groups of liquid storage cavities 4 and liquid guide cavities 5 are arranged in the same plane and are arranged at the same interval, the four groups of liquid storage cavities 4 and liquid guide cavities 5 are arranged in the same section and are used for symmetrically supporting the piston rods 23, the piston rods 23 are always located in the center of the working cylinder 2, damage to the inner wall of the working cylinder 2 caused by radial force of the piston rods 23 is effectively weakened, and working stability of the oil cylinder is kept.

Furthermore, a fixed magnet 3 is placed in the center of the inside of the sealing element 22, a spacing film 31 is fixedly connected between the periphery of the fixed magnet 3 and the inner wall of the sealing element 22, a spacing spring 32 is fixedly connected to the fixed magnet 3 inside the spacing film 31, the spacing spring 32 is fixedly connected with the inner wall of the sealing element 22, and liquid oil 33 is filled in the space of the sealing element 22 which is not the spacing film 31, so that the sealing element 22 can be always in an even expansion state, the sealing performance of the sealing element 22 is improved due to the fact that the fixed magnet 3 moves, the fixed magnet 3 has S-shaped magnetism, the movable rod 63 has S-shaped magnetism, and the two parts are in like polarity repulsion, so that liquid in the liquid storage cavity 4 and the liquid guide cavity 5 is pushed to extrude the small rubber film 51, and the hydraulic pressure borne by the sealing element 22 is reduced.

Further, the piston rod 23 comprises a cylinder and a round platform, the round platform of piston rod 23 and big piston 21 fixed connection, set up by piston groove 231 on the piston rod 23, and quantity is four, encircle the setting, the piston groove 231 depth department that is located the cylinder portion is the same, the piston groove 231 that is located the round platform portion reduces along with the diameter increase of piston rod 23, the piston groove 231 depth that is located the piston rod 23 bottom is zero, be favorable to fixed block 61 to steadily retract, the stability of piston rod 23 removal in-process has been improved.

The using method of the invention has the following working principle:

when the hydraulic rail bender is arranged on a rail to be bent, the screw rod 8 is rotated inwards, the push plate 81 pushes the movable block 7 to move inwards to drive the large rubber membrane 6 to move towards the center of the working cylinder 2, and when the large rubber membrane 6 reaches the piston groove 231 of the piston rod 23, the outer magnet 42 and the inner magnet 71 are attracted and supported, so that the large rubber membrane 6 can fixedly support the piston rod 23 and prevent the large rubber membrane 6 from retracting, and at the moment, the screw rod 8 reversely rotates to return to the original position; after the preparation work is finished, the components in the stretching cylinder 15 move up and down, so that hydraulic oil in the storage cylinder 12 enters the working cylinder 2 through the first check valve 14 and the second check valve 16, the large piston 21 moves under the pressure of the hydraulic oil to drive the piston rod 23 to move outwards, the large rubber membrane 6 is always positioned in the piston groove 231 of the piston rod 23 to fixedly support the piston rod 23 so as to enhance the stability of the large rubber membrane in order to prevent the piston rod 23 positioned outside from being extruded and damaged by the radial force; when the large rubber film 6 on the piston rod 23 moves to the circular table part of the piston rod 23, the large rubber film 6 is subjected to different pressures due to different diameters of the circular table part of the piston rod 23, so that one side of the movable block 7 moves downwards, the inner magnet 71 moves upwards in the long hole, the inner magnet 71 is separated from the outer magnet 42, the large rubber film 6 retracts, when the sealing member 22 moves to the corresponding position of the liquid storage cavity 4, the fixed magnet 3 in the sealing member 22 and the movable rod 63 in the large rubber membrane 6 repel each other due to the same magnetism, the movable rod 63 drives the movable block 7 to move towards the outside, and the liquid outside the movable block 7 is extruded, so that the liquid in the liquid storage cavity 4 moves towards the liquid guide cavity 5, the volume of the small rubber membrane 51 is enlarged, therefore, the contact area between the sealing element 22 and the hydraulic oil is reduced, the sealing element 22 is always under a small pressure, the service life of the sealing element 22 can be prolonged, and the sealing element 22 is prevented from being damaged and failing; when the sealing element 22 is far away from the liquid guide cavity 5, the movable rod 63 is not subjected to repulsion force any more, the pull force of the auxiliary spring 64 and the main spring 62 enables the movable block 7 to move inwards, the small rubber membrane 51 is retracted, and the large piston 21 is conveniently retracted inwards in a subsequent process; when the operation of the hydraulic rail bender is completed, the drain valve 17 is opened to return the hydraulic oil in the operating cylinder 2 to the storage cylinder 12, and the large piston 21 and the piston rod 23 move inward to return to the initial position.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A hydraulic rail bender for rail transit comprises a hydraulic oil cylinder (1), a rack (11) is fixedly connected to the rear side of the hydraulic oil cylinder (1), the right side of the inside of the hydraulic oil cylinder (1) is fixedly connected with a storage cylinder (12), an oil inlet valve (13) is fixedly connected between the hydraulic oil cylinder (1) and the storage cylinder (12), a stretching cylinder (15) is fixedly connected to the inside of the hydraulic oil cylinder (1) on the left side of the storage cylinder (12), a first one-way valve (14) is fixedly connected between the storage cylinder (12) and the stretching cylinder (15), a working cylinder (2) is fixedly connected to the left side of the stretching cylinder (15), a second one-way valve (16) is fixedly connected between the stretching cylinder (15) and the working cylinder (2), a hole is formed in the front side of the working cylinder (2), the oil drain valve (17) is fixedly connected with the hole of the oil drain valve (17), and the front side of the storage cylinder (12), big piston (21) has been cup jointed in the inside activity of working cylinder (2), sealing member (22) have been cup jointed to the outside of big piston (21) fixed, the right side and piston rod (23) fixed connection of big piston (21) are located piston rod (23) one end fixedly connected with top (24) in working cylinder (2) outside, return spring (25) fixed connection, its characterized in that are passed through with the inner wall of working cylinder (2) in big piston (21): the hydraulic oil cylinder is characterized in that liquid storage cavities (4) are formed in the inner walls of the hydraulic oil cylinder (1) and the working cylinder (2), a large rubber film (6) is fixedly sleeved on one side of the liquid storage cavity (4) close to the working cylinder (2), a fixed block (61) is fixedly connected to the inner side of the large rubber film (6), an elongated slot is formed in the fixed block (61), the bottom end of the elongated slot is fixedly connected with one end of a main spring (62), the other end of the main spring (62) is fixedly connected with the upper end of a movable rod (63), the lower end of the movable rod (63) is fixedly connected with a movable block (7), an auxiliary spring (64) is fixedly connected to the top end of the movable block (7) positioned on the two sides of the movable rod (63), the auxiliary spring (64) is fixedly connected with the bottom end of the fixed block (61), and a liquid guide cavity (5) is formed in the, be located and be close to little rubber membrane (51) of stock solution chamber (4) one side fixedly connected with of working cylinder (2) is located the fixed cover of drain chamber (5) inner wall of little rubber membrane (51) below has been cup jointed and has been crossed liquid board (52), through return spring (53) swing joint between little rubber membrane (51) and crossing liquid board (52).

2. A hydraulic rail bender for rail traffic as claimed in claim 1, wherein: be located stock solution chamber (4) inner wall of big rubber membrane (6) top is encircleed and is installed embedded magnet (41), fixed block (61) top is encircleed and is installed embedded piece (65), is located stock solution chamber (4) inner wall both sides of big rubber membrane (6) below are seted up slottedly, and the inslot activity has cup jointed outer magnet (42), spring swing joint is passed through with the groove to the inboard of outer magnet (42), the slot hole has been seted up to the below of movable block (7), and the inside activity of slot hole has cup jointed inner magnet (71), two inner magnets (71) are through fixed spring (72) fixed connection.

3. A hydraulic rail bender for rail traffic as claimed in claim 2, wherein: the embedded magnet (41) is provided with N-type magnetism, the embedded block (65) is made of iron, the outer magnet (42) is provided with N-type magnetism, the inner magnet (71) is provided with S-type magnetism, and the upper portion of the right side of the long hole of the movable block (7) is arc-shaped.

4. A hydraulic rail bender for rail traffic as claimed in claim 1, wherein: the liquid storage cavity (4) and the liquid guide cavity (5) are filled with liquid, and eight rows of small holes are formed in the liquid passing plate (52).

5. A hydraulic rail bender for rail traffic as claimed in claim 1, wherein: the section of fixed block (61) is protruding font, the section of movable block (7) is concave font, both inlay the installation of fixed block (61) and movable block (7).

6. A hydraulic rail bender for rail traffic as claimed in claim 1, wherein: a sealing nut (82) is fixedly sleeved at the end, close to the liquid storage cavity (4) on the outer side of the hydraulic oil cylinder (1), of the liquid storage cavity, a screw rod (8) is sleeved at the middle part of the sealing nut (82) in a threaded mode, and a push plate (81) is fixedly sleeved at the end, located in the liquid storage cavity (4), of the screw rod (8).

7. A hydraulic rail bender for rail transit according to claim 6, characterized in that: stock solution chamber (4) and drainage chamber (5) same section in quantity be four groups, and encircle the setting, stock solution chamber (4) and drainage chamber (5) coplanar in quantity be three groups, and two liang of intervals are the same.

8. A hydraulic rail bender for rail traffic as claimed in claim 7, wherein: fixed magnet (3) have been placed to the inside central authorities of sealing member (22), fixedly connected with space stop film (31) between the inner wall of fixed magnet (3) all around and sealing member (22) is located inside fixed magnet (3) fixedly connected with space spring (32) of space stop film (31), the inner wall fixed connection of space spring (32) and sealing member (22), be filled with liquid oil (33) in sealing member (22) space of non-space stop film (31) part, fixed magnet (3) have S nature magnetism, movable rod (63) have S nature magnetism.

9. A hydraulic rail bender for rail traffic as claimed in claim 8, wherein: piston rod (23) comprise a cylinder and a round platform, the round platform and big piston (21) fixed connection of piston rod (23), set up by piston groove (231) on piston rod (23), and quantity be four, encircle the setting, be located the cylinder part piston groove (231) degree of depth department is the same, is located the round platform part piston groove (231) are along with the diameter increase of piston rod (23) and the degree of depth reduces, and the piston groove (231) degree of depth that is located piston rod (23) bottom is zero.