CN112808778B

CN112808778B - Metal rolling equipment of adjustable rolling thickness

Info

Publication number: CN112808778B
Application number: CN202110121255.3A
Authority: CN
Inventors: 杜平
Original assignee: Jiangmen Tegu Steel Structure Engineering Co ltd
Current assignee: Jiangmen Tegu Steel Structure Engineering Co ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2022-08-02
Anticipated expiration: 2041-01-28
Also published as: CN112808778A

Abstract

The invention relates to the technical field of rolling processing, and discloses metal rolling equipment capable of adjusting rolling thickness, which comprises a base, wherein a fixed support is welded on the upper surface of the base, a top plate is welded on the top of the fixed support, a separation mechanism is arranged inside the top plate, a centering mechanism is arranged on the right side of the fixed support, a connecting plate is welded on the front portion of the fixed support, an adjusting mechanism is arranged inside the connecting plate, a driving mechanism is arranged on the surface of the adjusting mechanism, and two rollers are arranged inside the fixed support. This metal rolling equipment of adjustable rolling thickness rotates through rotating accommodate the lead screw, and control trapezoidal alignment jig removes, controls the interval of two rolls, and then controls rolling thickness, and through the rolling thickness of adjusting the board material, the messenger that can be fine can carry out the sheet material rolling to different thickness, improve equipment's whole commonality and suitability.

Description

Metal rolling equipment of adjustable rolling thickness

Technical Field

The invention relates to the technical field of rolling processing, in particular to metal rolling equipment capable of adjusting rolling thickness.

Background

Ferrous materials have become the primary base material for global applications, and about 90% of these steels are produced by rolling. The high-efficiency steel rolling industry and technology enable steel rolling to be the main steel forming mode in the steel industry all the time, and the rolling method is adopted to produce steel, so that the production rate is high, the variety is multiple, and the mechanization and automation are easy to realize.

At present, in the rolling processing operation, some plates need to be rolled, but many devices at present cannot adjust the rolling thickness according to the thickness of products, so that the limitation exists in the rolling process, the plates or iron sheets with different thicknesses are not suitable for processing, meanwhile, some products need to be repeatedly rolled in the rolling process, most of the products are processed by manually pulling left and right, and the rolling equipment has certain danger; in addition, since the workpiece cannot be easily taken out after rolling due to the pressing action of the rolls, a metal rolling facility capable of adjusting the rolling thickness has been proposed to solve the above-mentioned problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides metal rolling equipment capable of adjusting the rolling thickness, and solves the problems that the rolling thickness of the traditional rolling equipment cannot be adjusted, the repeated rolling efficiency is low, and the safety is low.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a metal rolling equipment of adjustable rolling thickness, includes the base, the last skin weld of base has the fixed bolster, the top welding of fixed bolster has the roof, the inside of roof is provided with breaks away from the mechanism, the right side of fixed bolster is provided with centering mechanism, the anterior welding of fixed bolster has the connecting plate, the inside of connecting plate is provided with adjustment mechanism, adjustment mechanism's surface is provided with actuating mechanism, the inside of fixed bolster is provided with two rolls, the axle center fixedly connected with roller of department of roll.

Preferably, the fixed bolster's inside has seted up spacing spout and adjustment tank respectively, spacing spout is located the left side of adjustment tank, the inner wall of adjustment tank and the surface sliding connection of roller.

Preferably, adjustment mechanism is including accommodate the lead screw, accommodate the lead screw's surperficial threaded connection is in the inside of connecting plate, accommodate the lead screw's right-hand member rotates and is connected with the carriage, the sliding surface connection of carriage is at the inner wall of spacing spout, the right side welding of carriage has the fixed plate, the front portion of fixed plate rotates respectively and is connected with adjusting gear and drive gear, and adjusting gear and drive gear's surface intermeshing, adjusting gear and drive gear's surface all meshes has connecting gear, and two connecting gear's inside difference fixed connection is at the front end of two rollers.

Preferably, the surface welding of carriage has the alignment jig, the right side welding of alignment jig has two spacing slide bars, the inner wall of alignment jig and the surface of roller contact each other.

Preferably, the structure of alignment jig is trapezoidal, the material of alignment jig is the titanium alloy, the quantity of alignment jig is provided with two, and two alignment jigs all use the central line of fixed bolster as symmetry axis symmetric distribution, the upper surface welding of carriage has the stock guide.

Preferably, actuating mechanism is including driving motor, driving motor's fixed surface is connected with the V template, the surfacing welding of V template is on the surface of carriage, driving motor's output fixedly connected with drive handle, the surperficial sliding connection of drive handle has the arc pinion rack, the circulating slot has been seted up to the inside of arc pinion rack, and the sliding surface of drive handle connects the inner wall at the circulating slot, the surface of arc pinion rack and drive gear's surface intermeshing, the skin weld of arc pinion rack has the movable sleeve, the axle center department of movable sleeve rotates the rear portion of connecting at the V template.

Preferably, the separation mechanism comprises a sliding plate, a limiting piece is welded on the surface of the sliding plate, the surface of the sliding plate is connected to the inside of the top plate and the inside of the fixing support in a sliding mode, a bolt is inserted into the inside of the sliding plate, and a bolt hole is formed in the inside of the sliding plate.

Preferably, the rear portion of slide and the anterior mutual contact of V template, the inside sliding connection respectively of V template has first slide-shaft and second slide-shaft, the surface of first slide-shaft and second slide-shaft has all cup jointed extrusion spring, the rear end welding of second slide-shaft has the backup pad, the top welding of backup pad is on the surface of alignment jig.

Preferably, centering mechanism is including splint, the skin weld of splint has two branches, the surperficial sliding connection of branch has a mounting panel, the left side welding of mounting panel is in the right side of fixed bolster, the centering spring has been cup jointed on the surface of branch, the centering spring is located between mounting panel and the splint, the inside of mounting panel and the surperficial sliding connection of spacing slide bar.

Compared with the prior art, the invention provides metal rolling equipment capable of adjusting rolling thickness, which has the following beneficial effects:

1. through rotating accommodate the lead screw and rotating, control trapezoidal alignment jig and remove, control the interval of two rolls, and then control rolling thickness, and through the rolling thickness of adjusting the board material, the messenger that can be fine can carry out the rolling to the sheet material of different thickness, improve equipment's whole commonality and suitability.

2. The rotation of control driving motor will drive the rotation of drive handle, and two connection gear rotations will directly drive the relative circulation rotation of two rolls, and the motor need not just reversal, only needs to rotate always can realize the processing of relapseing rolling to the sheet material for the part is at rolling in-process, and efficiency is higher.

3. Through upwards extracting the slide, receive two extrusion spring's effect, will promote the V template and move forward for whole actuating mechanism breaks away from, makes two rolls become free state, directly stimulates the product, and two rolls rotate thereupon, will relax take out the product, thereby to a great extent make things convenient for taking out to rolling product.

4. The plate is directly pulled into the space between the two rollers from the position of the support plate, manual contact and operation are not needed, and the safety of the rolling process is improved through manual operation.

5. Through the extrusion of a plurality of centering springs on both sides, will control two splint and press from both sides tight centering and align to the sheet material to a great extent make things convenient for the rolling to the sheet material, provide the stability in the rolling process, improve rolling effect.

Drawings

FIG. 1 is a schematic view of the overall structure of a metal rolling apparatus with adjustable rolling thickness according to the present invention;

FIG. 2 is a schematic structural view of a fixing bracket of a metal rolling device capable of adjusting rolling thickness according to the present invention;

FIG. 3 is a schematic view of an adjusting mechanism of a metal rolling device capable of adjusting the rolling thickness according to the present invention;

FIG. 4 is a schematic view of the connection of an adjusting bracket of a metal rolling device capable of adjusting the rolling thickness according to the present invention;

FIG. 5 is a schematic view of a driving mechanism of a metal rolling apparatus capable of adjusting rolling thickness according to the present invention;

FIG. 6 is a schematic structural view of a driving handle of a metal rolling device capable of adjusting rolling thickness according to the present invention;

fig. 7 is a schematic structural diagram of an arc-shaped toothed plate of a metal rolling device capable of adjusting rolling thickness according to the invention;

FIG. 8 is a schematic view of a disengagement mechanism of a metal rolling apparatus of the present invention for adjusting the rolling thickness;

FIG. 9 is a schematic structural diagram of a sliding plate of a metal rolling device capable of adjusting rolling thickness according to the present invention;

fig. 10 is a schematic view of a centering mechanism of a metal rolling device capable of adjusting rolling thickness according to the invention.

In the figure: 1. a base; 2. a top plate; 3. fixing a bracket; 4. rolling; 5. an adjustment mechanism; 501. adjusting a screw rod; 502. a carriage; 503. a fixing plate; 504. a connecting gear; 505. an adjusting bracket; 506. an adjusting gear; 507. a drive gear; 508. a limiting slide bar; 509. a material guide plate; 6. a drive mechanism; 61. a drive motor; 62. a V-shaped plate; 63. an arc toothed plate; 64. a circulation tank; 65. a drive handle; 66. a movable sleeve; 7. a disengagement mechanism; 71. a slide plate; 72. a limiting sheet; 73. a bolt; 74. a first slide shaft; 75. a second slide shaft; 76. a support plate; 77. a compression spring; 78. a pin hole; 8. a centering mechanism; 81. a splint; 82. a mounting plate; 83. a strut; 84. a centering spring; 9. a connecting plate; 10. an adjustment groove; 11. a limiting chute; 12. and (4) a roll shaft.

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. 1-7, a metal rolling device capable of adjusting rolling thickness comprises a base 1, a fixed support 3 is welded on the upper surface of the base 1, a top plate 2 is welded on the top of the fixed support 3, a separation mechanism 7 is arranged inside the top plate 2, a centering mechanism 8 is arranged on the right side of the fixed support 3, a connecting plate 9 is welded on the front portion of the fixed support 3, an adjusting mechanism 5 is arranged inside the connecting plate 9, a driving mechanism 6 is arranged on the surface of the adjusting mechanism 5, two rollers 4 are arranged inside the fixed support 3, and a roller shaft 12 is fixedly connected to the axis of each roller 4.

In this embodiment, spacing spout 11 and adjustment tank 10 have been seted up respectively to the inside of fixed bolster 3, spacing spout 11 is located the left side of adjustment tank 10, the inner wall of adjustment tank 10 and the surface sliding connection of roller 12, adjustment tank 10 through setting up can be fine provides the regulation space of two rolls 4, make roll 4 can slide adjusting in this region, spacing spout 11 then is the position of stopping adjustment mechanism 5 for fine restriction, make adjustment mechanism 5 only can carry out the removal of controlling the position, it is fine spacing to carry out, the adjustable stability of assurance equipment.

Furthermore, the adjusting mechanism 5 comprises an adjusting screw 501, the surface of the adjusting screw 501 is screwed inside the connecting plate 9, the right end of the adjusting screw 501 is rotatably connected with a sliding frame 502, the surface of the sliding frame 502 is slidably connected with the inner wall of the limit sliding chute 11, the right side of the sliding frame 502 is welded with a fixing plate 503, the front part of the fixing plate 503 is rotatably connected with an adjusting gear 506 and a driving gear 507 respectively, the surfaces of the adjusting gear 506 and the driving gear 507 are meshed with each other, the surfaces of the adjusting gear 506 and the driving gear 507 are both meshed with a connecting gear 504, the insides of the two connecting gears 504 are fixedly connected with the front ends of the two roll shafts 12 respectively, the sliding frame 502 is pushed to move forwards and forwards through the rotation of the adjusting screw 501 through the screwing connection, so as to provide an adjusting power source, because of the screwing connection mode, stepless adjustment can be performed in the adjusting process, very convenient and fast, and the device can also directly adjust at rolling in-process, more convenient to the regulation rolling of panel material.

Further, the adjusting frame 505 is welded on the surface of the sliding frame 502, the two limiting slide rods 508 are welded on the right side of the adjusting frame 505, the inner wall of the adjusting frame 505 is in contact with the surface of the roll shaft 12, the two rolls 4 slide outwards through the movement of the adjusting frame 505, the gap between the two rolls 4 can be changed, the device can be used for rolling plates with different thicknesses well, and the overall universality and the applicability of the device are improved.

Furthermore, the structure of the adjusting frame 505 is trapezoidal, the adjusting frame 505 is made of titanium alloy, the number of the adjusting frames 505 is two, the two adjusting frames 505 are symmetrically distributed by taking the center line of the fixing support 3 as a symmetry axis, the guide plate 509 is welded on the upper surface of the sliding frame 502, and the two rollers 4 are improved in stability in the rolling process in a set symmetrical mode, so that the situation that the rolling process is high and low cannot occur, the material of the titanium alloy has strong pressure resistance, the pressure resistance of the adjusting frame 505 is high due to the fact that the force in the rolling process can be transmitted to the upper surface of the adjusting frame 505, and the design of the guide plate 509 is that the plate is pulled out from the position conveniently.

In addition, the driving mechanism 6 includes a driving motor 61, a V-shaped plate 62 is fixedly connected to the surface of the driving motor 61, the surface of the V-shaped plate 62 is welded to the surface of the sliding frame 502, a driving handle 65 is fixedly connected to the output end of the driving motor 61, an arc-shaped toothed plate 63 is slidably connected to the surface of the driving handle 65, a circulating groove 64 is formed in the arc-shaped toothed plate 63, the surface of the driving handle 65 is slidably connected to the inner wall of the circulating groove 64, the surface of the arc-shaped toothed plate 63 is meshed with the surface of the driving gear 507, a movable sleeve 66 is welded to the surface of the arc-shaped toothed plate 63, the axis of the movable sleeve 66 is rotatably connected to the rear portion of the V-shaped plate 62, the driving handle 65 is driven to rotate by controlling the rotation of the driving motor 61, the driving handle 65 is driven to rotate in the circulating groove 64, and then the arc-shaped toothed plate 63 is driven to perform left-right reciprocating swinging in a circular shape of the movable sleeve 66, therefore, the plate can be repeatedly rolled, and the effect of the part is better in the rolling process.

Referring to fig. 8-10, the detaching mechanism 7 includes a sliding plate 71, a limiting piece 72 is welded on the surface of the sliding plate 71, the surface of the sliding plate 71 is slidably connected to the inside of the top plate 2 and the fixing bracket 3, a bolt 73 is inserted into the inside of the sliding plate 71, a bolt hole 78 is formed in the inside of the sliding plate 71, and the sliding plate 71 can be well fixed by directly inserting the bolt 73, so that the sliding plate 71 does not slide up and down during rolling, the sliding plate 71 is not extruded and loses efficacy, and the overall stability of the device is ensured.

In this embodiment, the rear portion of the sliding plate 71 contacts with the front portion of the V-shaped plate 62, the inside of the V-shaped plate 62 is slidably connected with a first sliding shaft 74 and a second sliding shaft 75, the surfaces of the first sliding shaft 74 and the second sliding shaft 75 are sleeved with an extrusion spring 77, the rear end of the second sliding shaft 75 is welded with a supporting plate 76, the top of the supporting plate 76 is welded on the surface of the adjusting frame 505, because of repeated rolling, the part can be clamped between the two rollers 4, the part can not be taken out by forced pulling, the V-shaped plate 62 is pushed to move forwards by pulling the sliding plate 71 upwards and under the action of the two extrusion springs 77, the whole driving mechanism 6 is separated, the two rollers 4 are in a free state at the moment, the product is directly pulled, the two rollers 4 rotate along with the product, the product can be easily taken out, thereby greatly facilitating the taking out of the rolled product and preventing the rolled product from being always clamped inside the two rollers 4.

It is worth noting that the centering mechanism 8 comprises a clamping plate 81, two supporting rods 83 are welded on the surface of the clamping plate 81, a support plate 82 is connected to the surface of each supporting rod 83 in a sliding mode, the left side of each support plate 82 is welded on the right side of the fixing support 3, a centering spring 84 is sleeved on the surface of each supporting rod 83 in a sleeved mode, each centering spring 84 is located between each support plate 82 and each clamping plate 81, the inner portion of each support plate 82 is connected with the surface of a limiting sliding rod 508 in a sliding mode, the plate is pulled into the space between the two rollers 4 from the position of each support plate 82 and is extruded by the centering springs 84 on the two sides, the two clamping plates 81 are controlled to clamp, center and align the plate, accordingly rolling of the plate is facilitated to a large extent, manual aligning and clamping are not needed, stability of the plate in the rolling process is improved, and safety of the rolling process is improved without manual operation.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

The working principle is that firstly, when the metal plate is rolled, the plate is drawn between the two rollers 4 from the position of the support plate 82, because when the plate enters from the position of the support plate 82, the plate is extruded by the centering springs 84 at the two sides, the two clamping plates 81 are controlled to clamp, center and align the plate, so that the rolling of the plate is greatly facilitated, manual alignment and clamping are not needed, then the sliding plate 71 is pressed, the sliding plate 71 extrudes the V-shaped plate 62 to move backwards through the design of the concave-convex area, the backward movement of the V-shaped plate 62 controls the whole driving mechanism 6 to move backwards, at this time, the meshing of the arc-shaped toothed plate 63 and the driving gear 507 is controlled, at this time, the rotation of the driving motor 61 is controlled, the driving handle 65 is driven to rotate, the driving handle 65 rotates in the circulating groove 64, and then the arc-shaped toothed plate 63 is driven to circularly swing left and right around the center of the movable sleeve 66, at this time, the arc toothed plate 63 is meshed with the driving gear 507, so that the driving gear 507 is driven to rotate, the rotation of the driving gear 507 drives the two connecting gears 504 to rotate through the meshing of the gears, the two connecting gears 504 rotate to directly drive the two rollers 4 to rotate relatively, so that the rolling operation processing of the plate is realized, the circular rotation is performed, the movement tracks of the two rollers 4 are forward rotation for several circles and then reverse rotation for several circles, so that the plate is repeatedly rolled, the part is better in the rolling process, after the rolling processing is completed, the part is repeatedly rolled, the part can be clamped between the two rollers 4 at this time, the part cannot be taken out through forced pulling, the plug pin 73 is pulled out at this time, the sliding plate 71 is pulled out upwards, and the V-shaped plate 62 is pushed to move forwards under the action of the two extrusion springs 77, so that the whole driving mechanism 6 is separated, at the moment, the arc-shaped toothed plate 63 is separated from the driving gear 507, at the moment, the two rollers 4 are in a free state, the product is directly pulled, the two rollers 4 rotate along with the rotation of the two rollers 4, the product can be easily taken out, the rolled product can be taken out conveniently to a great extent, the rolled product cannot be clamped inside the two rollers 4 all the time, the thickness of the sheet stock is different due to the metal plate, the traditional rollers 4 cannot be adjusted in rolling thickness, at the moment, the adjusting screw rod 501 can rotate, the sliding frame 502 can be pushed to move forwards left and right through the rotation of threaded connection, the sliding frame 502 can drive the adjusting frame 505 to move when moving, because of the trapezoidal structure, the adjusting frame 505 firstly presses the two roller shafts 12 to slide inside the adjusting groove 10 when moving to the right, at the distance between the two rollers 4 is reduced, at the moment, the rolling thickness is reduced, and the distance between the two connecting gears 504 is reduced after the reduction, at the moment, the adjusting frame 505 moves rightwards to control the adjusting gear 506 and the driving gear 507 to move rightwards, so that the meshing positions of the two gears and the connecting gears 504 are changed, when the adjusting frame 505 moves leftwards, the direction of the right side is converted after the movement, but the meshing state is always kept, and when the adjusting frame 505 moves leftwards, the two connecting gears 504 are extruded by the adjusting gear 506 and the driving gear 507, so that the two rollers 4 slide outwards, the gap between the two rollers 4 is enlarged, the rolling thickness of the plate is further improved, and by adjusting the rolling thickness of the plate, the device can well roll the plates with different thicknesses, and the overall universality and the applicability of the device are improved.

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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. A metal rolling equipment of adjustable rolling thickness, includes base (1), its characterized in that: the roller-type rolling mill is characterized in that a fixed support (3) is welded on the upper surface of the base (1), a top plate (2) is welded on the top of the fixed support (3), a separation mechanism (7) is arranged inside the top plate (2), a centering mechanism (8) is arranged on the right side of the fixed support (3), a connecting plate (9) is welded on the front portion of the fixed support (3), an adjusting mechanism (5) is arranged inside the connecting plate (9), a driving mechanism (6) is arranged on the surface of the adjusting mechanism (5), two rollers (4) are arranged inside the fixed support (3), and a roller shaft (12) is fixedly connected to the axis of each roller (4);

the driving mechanism (6) comprises a driving motor (61), a V-shaped plate (62) is fixedly connected to the surface of the driving motor (61), the surface of the V-shaped plate (62) is welded to the surface of the sliding frame (502), a driving handle (65) is fixedly connected to the output end of the driving motor (61), an arc-shaped toothed plate (63) is slidably connected to the surface of the driving handle (65), a circulating groove (64) is formed in the arc-shaped toothed plate (63), the surface of the driving handle (65) is slidably connected to the inner wall of the circulating groove (64), the surface of the arc-shaped toothed plate (63) is meshed with the surface of the driving gear (507), a movable sleeve (66) is welded to the surface of the arc-shaped toothed plate (63), and the axis of the movable sleeve (66) is rotatably connected to the rear portion of the V-shaped plate (62);

the separation mechanism (7) comprises a sliding plate (71), a limiting sheet (72) is welded on the surface of the sliding plate (71), the surface of the sliding plate (71) is connected to the inside of the top plate (2) and the fixed support (3) in a sliding mode, a bolt (73) is inserted into the inside of the sliding plate (71), and a bolt hole (78) is formed in the inside of the sliding plate (71); a limiting sliding groove (11) and an adjusting groove (10) are respectively formed in the fixed support (3), the limiting sliding groove (11) is located on the left side of the adjusting groove (10), and the inner wall of the adjusting groove (10) is in sliding connection with the surface of the roller shaft (12);

the adjusting mechanism (5) comprises an adjusting screw rod (501), the surface of the adjusting screw rod (501) is in threaded connection with the inside of the connecting plate (9), the right end of the adjusting screw rod (501) is rotatably connected with a sliding frame (502), the surface of the sliding frame (502) is in sliding connection with the inner wall of the limiting sliding groove (11), a fixing plate (503) is welded on the right side of the sliding frame (502), the front part of the fixing plate (503) is respectively and rotatably connected with an adjusting gear (506) and a driving gear (507), the surfaces of the adjusting gear (506) and the driving gear (507) are meshed with each other, the surfaces of the adjusting gear (506) and the driving gear (507) are respectively meshed with a connecting gear (504), and the insides of the two connecting gears (504) are respectively and fixedly connected with the front ends of the two roll shafts (12);

an adjusting frame (505) is welded on the surface of the sliding frame (502), two limiting sliding rods (508) are welded on the right side of the adjusting frame (505), and the inner wall of the adjusting frame (505) is in contact with the surface of the roll shaft (12);

the structure of the adjusting frames (505) is trapezoidal, the adjusting frames (505) are made of titanium alloy, the number of the adjusting frames (505) is two, the two adjusting frames (505) are symmetrically distributed by taking the central line of the fixed support (3) as a symmetry axis, and the upper surface of the sliding frame (502) is welded with a material guide plate (509);

the rear part of the sliding plate (71) is in contact with the front part of the V-shaped plate (62), the interior of the V-shaped plate (62) is respectively connected with a first sliding shaft (74) and a second sliding shaft (75) in a sliding mode, the surfaces of the first sliding shaft (74) and the second sliding shaft (75) are respectively sleeved with an extrusion spring (77), the rear end of the second sliding shaft (75) is welded with a supporting plate (76), and the top of the supporting plate (76) is welded on the surface of an adjusting frame (505);

centering mechanism (8) are including splint (81), the skin weld of splint (81) has two branch (83), the surperficial sliding connection of branch (83) has mounting panel (82), the left side welding of mounting panel (82) is on the right side of fixed bolster (3), centering spring (84) has been cup jointed on the surface of branch (83), centering spring (84) are located between mounting panel (82) and splint (81), the inside of mounting panel (82) and the surface sliding connection of spacing slide bar (508).