CN111719363A - Method for eliminating arch-up defect of railway sleeper - Google Patents

Abstract

The invention discloses a method for eliminating arch-up faults of railway sleepers, which comprises the following steps: the method comprises the following steps: moving a frame of the cutting device above a sleeper to be cut; step two: the frame of the cutting device and the sleeper are fixed, and the front and back directions of the frame are consistent with the extending direction of the rail as much as possible. Step three: the frame is adjusted to be parallel to the horizontal reference plane. Step four: and (3) cutting the profile surface of the cutting tool bit of the cutting device close to the sleeper to ensure that the cutting tool bit is attached to the profile surface of the sleeper. Step five: and driving the cutting tool head to cut the profile surface of the sleeper. Step six: and replacing the cutting tool bit with a milling tool bit, and milling the profile surface of the sleeper. Compared with the prior art, the method orients and positions the cutting device, sinks the steel rail by cutting and milling the profile surface of the sleeper, readjusts the horizontal reference of the steel rail line, ensures the smoothness of the line, eliminates the crown defect, and ensures the running speed and stability of the railway line.

Description

Method for eliminating arch-up defect of railway sleeper

Technical Field

The invention relates to the technical field of sleeper maintenance, in particular to a method for eliminating arch-up faults of railway sleepers.

Background

The sleeper is one of railway fittings and mainly used for supporting a steel rail, maintaining the position of the steel rail and transmitting the huge pressure transmitted by the steel rail to a track bed. Among the existing railway tracks, especially high track way is mostly ballastless track, and the ride comfort is good, and stability is high. The sleeper on the ballastless track is made of reinforced concrete materials, and has higher stability and longer service life.

In practical situations, the geology is arched upwards due to stress changes, and the railway track is subjected to an uparching disease. Since railway tracks are sensitive to track reference heights, the horizontal height difference per kilometer needs to be controlled within 2 mm. Thus, small changes in the geological structure, which accumulate over time, easily exceed this limit height difference. This variation is even more pronounced, particularly in long tunnels. As long as the height difference exceeds the limit, the running speed of the high-speed rail needs to be reduced, and the running efficiency and the running safety are greatly influenced.

In view of the above, the applicant has made an intensive study to solve the above problems and has made the present invention.

Disclosure of Invention

The invention mainly aims to provide a method for eliminating the crown defect of a railway sleeper, which can orient and position a cutting device, sink a steel rail by cutting and milling the profile surface of the sleeper, readjust the horizontal reference of a steel rail line, ensure the smoothness of the line and eliminate the crown defect, thereby ensuring the running speed and the stability of the railway line.

In order to achieve the above purpose, the solution of the invention is:

a method for eliminating arch faults on railway sleepers comprises the following steps:

the method comprises the following steps: moving a frame of the cutting device above a sleeper to be cut;

step two: the frame of the cutting device and the sleeper are fixed, and the front and back directions of the frame are consistent with the extending direction of the rail as much as possible.

Step three: the frame is adjusted to be parallel to the horizontal reference plane.

Step four: and (3) cutting the profile surface of the cutting tool bit of the cutting device close to the sleeper to ensure that the cutting tool bit is attached to the profile surface of the sleeper.

Step five: the cutting head is driven to cut the profile surface of the sleeper.

Step six: and replacing the cutting tool bit with a milling tool bit, and milling the profile surface of the sleeper.

Further, in step one, the frame passes through the moving mechanism drive and moves on the ballast bed, automatic gyro wheel mechanism includes first gyro wheel, first gyro wheel mount pad, first gyro wheel pivot and gyro wheel motor, first gyro wheel mount pad is installed in the below of frame, first gyro wheel mount pad is equipped with two and controls the first gyro wheel mounting panel of correspondence and vertical setting, first gyro wheel mounting panel is equipped with first gyro wheel pivot connecting hole, first gyro wheel pivot stretches into first gyro wheel pivot connecting hole internal rotation and connects, first gyro wheel cover is established in first gyro wheel pivot and is established between two first gyro wheel mounting panels, the gyro wheel motor is established on first gyro wheel mounting panel to the power take off end and the first gyro wheel pivot of gyro wheel motor are connected.

Further, moving mechanism includes four automatic gyro wheel mechanisms, the frame is rectangular frame, and is equipped with the gyro wheel connection foot that downwardly extending set up below four apex angles of frame, automatic gyro wheel mechanism installs on gyro wheel connection foot.

Furthermore, in the first step, when the rack moves on the road bed, the rack is guided by a guide mechanism, and the guide mechanism comprises a guide mounting frame which is rotatably connected with the rack and a guide roller which is horizontally arranged and rotatably connected to the lower end of the guide mounting frame.

Furthermore, the guide mechanism further comprises a side abutting device, the side abutting device comprises an abutting mounting seat, an abutting pressing plate and an abutting driving device for driving the abutting pressing plate to do horizontal movement, the abutting mounting seat is connected to the guide side plate, the abutting driving device is horizontally arranged on the abutting mounting seat, the abutting pressing plate is vertically arranged, the abutting pressing plate and the guide side plate are perpendicular to each other, and a power output end of the abutting driving device is connected with the abutting pressing plate.

Furthermore, in the second step and the third step, the rack is positioned through the aligning mechanism, and the rack is adjusted to be parallel to the horizontal reference surface, the aligning mechanism comprises a plurality of groups of aligning clamping jaw sets correspondingly arranged in the front-back direction of the rack, each aligning clamping jaw set comprises two aligning clamping jaws symmetrically arranged on the left side and the right side of the rack, and the aligning clamping jaws are connected with the sleeper in a matched mode.

Further, adjust the clamping jaw well and include die head and jacking drive arrangement, jacking drive arrangement establishes in the frame, jacking drive arrangement's power take off end with the die head is connected and drive die head is vertical elevating movement, the below of die head is equipped with the fixed slot, the fixed slot is connected with the sleeper cooperation.

Further, the fixed slot has first arcwall face and the second arcwall face with the laminating of sleeper upper surface, first arcwall face is established in the die head and is close to the inboard one end of frame to first arcwall face extends and upwards arches gradually by the die head outside to die head middle part direction, the one end that the die head is close to the frame outside is established to the second arcwall face, the second arcwall face extends and upwards arches gradually by the die head outside to die head middle part direction.

Furthermore, one end, close to the frame inboard, of die head below is equipped with horizontal binding face, horizontal binding face is connected with first arcwall face.

Furthermore, the aligning mechanism comprises two groups of aligning clamping jaw groups, and the two groups of aligning clamping jaw groups are correspondingly arranged at the front end and the rear end of the rack in a front-back mode.

Further, in the third step, the cutting tool bit moves the actuating mechanism through the tool bit and carries out front and back, left and right sides and elevating movement in the frame, tool bit moves the actuating mechanism and includes the longitudinal movement drive arrangement that the drive cutting tool bit removed along the fore-and-aft direction of frame, the lateral shifting drive arrangement that the drive cutting tool bit removed along the left and right sides of frame to and the vertical removal drive arrangement that the drive cutting tool bit carried out elevating movement.

Furthermore, the cutter head moving and driving mechanism further comprises a moving support beam extending along the left and right directions of the rack, the two ends of the moving support beam are connected with the left and right sides of the rack in a sliding mode, and the power output end of the longitudinal moving and driving device is connected with the moving support beam.

Furthermore, the longitudinal movement driving device comprises a first motor and a first screw rod, the first motor is arranged on the rack, and a power output end of the first motor is connected with the first screw rod; the first screw rod is horizontally arranged and in threaded connection with the movable supporting beam, and the first screw rod is vertically arranged with the movable supporting beam.

Further, the cutter head moving driving mechanism further comprises a bearing frame, the bearing frame is sleeved on the moving support beam and is in sliding connection with the moving support beam, the transverse moving driving device is arranged on the moving support beam, and the power output end of the transverse moving driving device is connected with the moving support beam.

Furthermore, a second guide slide rail arranged along the extending direction of the movable support beam is further arranged on the movable support beam, and a second guide sliding groove matched with the second guide slide rail to slide is arranged on the bearing frame.

Furthermore, the transverse movement driving device comprises a second motor and a second screw rod, the power output end of the second motor is in transmission connection with the second screw rod, the extending direction of the second screw rod is parallel to the extending direction of the movable supporting beam, and a thread sleeve in threaded fit with the second screw rod is arranged on the bearing frame.

Further, the cutter head moving driving mechanism further comprises an installation frame, the vertical moving driving device is connected to the installation frame, the power output end of the vertical moving driving device is connected to the bearing frame, and the cutting cutter head and the cutter head rotating driving device are arranged on the installation frame.

Further, vertical mobile drive arrangement includes the third motor, transmission lead screw and two third lead screws, transmission lead screw level sets up, the vertical setting of third lead screw, the power take off end and the transmission lead screw transmission of third motor are connected, the both ends and the third lead screw transmission of transmission lead screw are connected, both sides correspond and are equipped with the thread piece around the bearing frame, third lead screw and thread piece threaded connection.

Further, the installation frame includes the link, rotating turret and slewing mechanism, the cutting tool bit with the rotating turret rotates to be connected, tool bit rotation drive device establishes on the rotating turret, be equipped with the rotation main shaft on the link, the rotating turret is equipped with the first rotation through-hole that supplies the rotation main shaft to pass, the slewing mechanism drive the rotating turret rotates around the relative link of rotation main shaft.

Further, slewing mechanism includes the cam, the fourth motor, the fourth lead screw to and the screw thread turning block, cam and rotating turret fixed connection, the cam has the connecting portion of being connected with the rotating turret, connecting portion be equipped with rotating spindle complex second rotation through-hole, connecting portion are equipped with to the convex bellying of connecting portion lateral surface, the screw thread turning block rotates with the bellying to be connected, the fourth motor is established on the link to the output and the fourth lead screw of fourth motor are connected, fourth lead screw level set up and with screw thread turning block threaded connection.

The during operation, cutting equipment has the orientation to the frame and adjusts the mechanism of adjusting well, adjust the mechanism and be equipped with two sets of front and back correspondences and adjust the clamping jaw group well, every group is adjusted the clamping jaw group well and is had two clamping jaws of adjusting well that set up side by side to with the group adjust two in the clamping jaw group well with the clamping jaw respectively with the track on with two mutual cutting ferrule of one row, make the orientation adjust to parallel with orbital extending direction around the frame. And then the four jacking driving devices respectively jack the rack to enable the rack to be adjusted to be parallel to the reference horizontal plane, and then the abutting driving devices drive the abutting pressing plates to be attached and abutted to the side walls of the track bed, so that the rack is fixed on the track bed. And finally, the cutting tool bits arranged on the left side and the right side of the rack are moved to two sleepers in the same row respectively through the tool bit moving driving mechanism to carry out tool setting, the tool bit rotating driving device drives the cutting tool bits to rotate to mill and grind the profile surface of the sleepers, then the cutting tool bits are replaced by milling and grinding tool bits, the profile surface of the sleepers is further refined, the milling and grinding precision is improved, meanwhile, the surface roughness of the profile surface is reduced, the milling and grinding quality is improved, and the sleepers are conveniently installed and matched with the rails.

Compared with the prior art, the method has the advantages that the cutting device is oriented and positioned, so that the cutting tool bit can be accurately aligned with the profile surface of the sleeper; and the tool bit moving driving mechanism drives the cutting tool bit to mill the profile surface of the sleeper to sink the steel rail, the horizontal reference of the steel rail line is readjusted, the line smoothness is ensured, and the upwarp defect is eliminated, so that the running speed and the running stability of the railway line are ensured.

Drawings

FIG. 1 is a schematic flow diagram of the process of the present invention.

Fig. 2 is a perspective view of the external structure of the cutting device.

Fig. 3 is a perspective view showing another external configuration of the cutting device.

Fig. 4 is a simplified schematic view of the cutting device adjusting the orientation of the moving frame on a curved track.

Fig. 5 is a simplified schematic view of the cutting apparatus adjusting the mobile frame to a horizontal position on the level of the raised floor.

Figure 6 is a perspective view of the alignment jaw profile.

Figure 7 is a cross-sectional view of the alignment jaw.

Fig. 8 is a perspective view of the outline structure of the moving mechanism.

Fig. 9 is a schematic sectional structure view of the moving mechanism.

Fig. 10 is a perspective view of the outer configuration of the guide mechanism.

Fig. 11 is a schematic sectional view of the guide mechanism.

Fig. 12 is a perspective view of the external structure of the mounting frame.

Fig. 13 is a perspective view of the external structure of the bearing frame.

Fig. 14 is a schematic sectional view showing the connection of the mounting frame and the carrying frame.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

In the figure, coordinate axes X, Y, Z respectively indicate the front-rear direction, the left-right direction, and the up-down direction of the present invention, and coordinate axis X indicates the front direction, coordinate axis Y indicates the right direction, coordinate axis Z indicates the up direction, and the intersection of coordinate axes X, Y, Z is point O.

As shown in fig. 1-14, a method for eliminating arch faults on railroad ties is characterized by comprising the following steps:

the method comprises the following steps: moving the frame 1 of the cutting device 2 above the sleepers 91 to be cut;

step two: the frame 1 of the cutting device 2 and the sleepers 91 are fixed so that the front-rear direction of the frame 1 coincides with the extending direction of the rails as much as possible.

Step three: the frame 1 is adjusted to be parallel to a horizontal reference plane.

Step four: the cutting head 21 of the cutting device 2 is adjusted in proximity to the profile surface 92 of the sleeper 91 so that the cutting head 21 fits the profile surface of the sleeper.

Step five: the cutting head 21 is driven to cut the profile surface 92 of the sleeper 91.

Step six: the cutting head 21 is replaced with a milling head, and the profile surface 92 of the sleeper 91 is milled. In certain embodiments, a longer replacement time is required due to the cumbersome operation of replacing the milling head. In order to shorten the operation time, the method of the invention can adopt two cutting devices, wherein the first cutting device 2 is provided with a cutting tool bit 21, the second cutting device 2 is provided with a milling tool bit, the first cutting device 2 is operated to cut and machine the profile surface 92 of the sleeper 91 and then is moved out, and then the second cutting device 2 is replaced to mill and finish the profile surface 92 of the sleeper 91.

Preferably, in the first step, the frame 1 is driven by the moving mechanism to move on the track bed, and the frame 1 is a rectangular frame structure and includes a first frame rod 11 disposed in front of the frame 1, a second frame rod 12 disposed behind the frame 1, a third frame rod 13 connected to the left side of the first frame rod 11 and the second frame rod 12, and a fourth frame rod 14 connected to the right side of the first frame rod 11 and the second frame rod 12. Moving mechanism 4 includes a plurality of automatic gyro wheel mechanisms, automatic gyro wheel mechanism includes first gyro wheel 41, first gyro wheel mount pad 42, first gyro wheel pivot 43 and gyro wheel motor 44, first gyro wheel mount pad 42 is installed in the below of frame 1, first gyro wheel mount pad 42 is equipped with two and controls first gyro wheel mounting panel 421 of corresponding and vertical setting, first gyro wheel mounting panel 421 is equipped with first gyro wheel pivot connecting hole 422, the both ends of first gyro wheel pivot 43 stretch into first gyro wheel pivot connecting hole 422 internal rotation and connect, first gyro wheel 41 cover is established on first gyro wheel pivot 43 and is established between two first gyro wheel mounting panels 421, gyro wheel motor 44 is established on first gyro wheel mounting panel 421, and the power take off end of gyro wheel motor 44 is connected with first gyro wheel pivot 43. After adopting above-mentioned structure, when cutting equipment removed, roller motor 44 drive first gyro wheel pivot 43 rotated to drive first gyro wheel 41 and rotate, make frame 1 can remove on ballast bed 94, adopt motor drive, it is more laborsaving, make frame 1 remove convenient and fast more.

More preferably, the moving mechanism 4 further comprises a braking device, the braking device comprises two annular friction plates 45, one annular friction plate 45 is mounted on the first roller rotating shaft 43, the other annular friction plate 45 is mounted on the first roller mounting plate 421 away from one side of the roller motor 44, and in a parking or power-off condition, a spring in the roller motor 44 is pressed tightly, so that the two annular friction plates 45 are in contact with each other to realize braking; when the power is on, the two annular friction plates 45 are separated from each other, so that the first roller 41 can normally run.

Preferably, in this embodiment, moving mechanism 4 includes four automatic roller mechanisms, and frame 1 is rectangular frame, and four apex angle below of frame 1 are equipped with the roller connection foot 16 that downwardly extending set up, and automatic roller mechanism installs on roller connection foot 16, adopts this structure for automatic roller mechanism installs more firmly. In addition, the moving mechanism 4 is arranged below four vertex angle supporting points of the rack 1, so that the stress of each automatic roller mechanism is more uniform, and the rack 1 is more stable and balanced when moving.

Preferably, in the first step, the frame 1 is guided by the guide mechanism 5 while moving on the track bed, and the guide mechanism 5 includes a guide mounting frame 51 rotatably connected to the frame 1 and a guide roller 52 horizontally disposed and rotatably connected to a lower end of the guide mounting frame 51. By adopting the structure, in the process that the rack 1 moves along the track bed 94, the guide rollers 52 are attached to and roll with the side wall of the track bed 94, so that the rack 1 is guided, the rack 1 can move more stably and smoothly, and the rack 1 can be limited to transversely move in the left-right direction, so that the rack 1 is prevented from falling from the track bed 94.

More preferably, the guide mounting bracket 51 includes a guide bottom plate 511 and two guide side plates 512, and the guide bottom plate 511 is vertically connected to the lower ends of the two guide side plates 512; the guide roller 52 and the guide base plate 511 are disposed parallel to each other and the guide roller 52 is rotatably coupled to the guide base plate 511.

More preferably, the guide mounting bracket 51 further includes a second roller mounting seat 53 and a second roller rotating shaft 54 which are arranged on the guide base plate 511, the second roller mounting seat 53 has a second roller mounting plate 531 which is arranged in parallel with the guide base plate 511, the second roller mounting plate 531 is provided with a second roller rotating shaft connecting hole 532, two ends of the second roller rotating shaft 54 extend into the second roller rotating shaft connecting hole 532 for rotational connection, and the guide roller 52 is sleeved on the second roller rotating shaft 54 and arranged between the two second roller mounting plates 531. By adopting the structure, the guide roller 52 is more convenient to disassemble and assemble and is convenient to maintain.

More preferably, the guide mounting frame 51 further includes an adapter plate 513 and a connecting plate 514, the adapter plate 513 is vertically arranged and is fixedly connected with the side of the rack 1, a first through hole is formed in the adapter plate 513, a through shaft 515 is arranged in the first through hole, the connecting plate 514 is parallel to the adapter plate 513, the upper ends of the two guide side plates 512 of the connecting plate 514 are vertically connected, a second through hole is formed in the connecting plate 514, and the second through hole is rotatably connected with the through shaft 515 in a matched manner. The side of frame 1 below still is equipped with first fixed ear 171, is equipped with the fixed ear 172 of second on the direction curb plate 512, and first fixed ear 171 sets up with the fixed ear 172 parallel of second to be equipped with the fixed hole 173 that corresponds the setting on the fixed ear 171 of first fixed ear and the fixed ear 172 of second. When the frame 1 needs to be separated from the track bed 94, the guide mechanism 5 needs to be retracted, the guide mounting frame 51 can be rotated upward around the rotating shaft 515, the guide mounting frame 51 is close to the frame 1, and the second fixing lug 172 is close to the first fixing lug 171, and then the fixing pins are inserted into the fixing holes 173 of the first fixing lug 171 and the second fixing lug 172, so that the retracted guide mounting frame 51 is fixed. By adopting the structure, the guide mechanism 5 can be folded more conveniently and rapidly.

More preferably, the guide mounting bracket 51 further includes a fixing plate 516, the fixing plate 516 is connected between the two guide side plates 512, and the upper end of the fixing plate 516 is connected to the connecting plate 514 and the lower end abuts against the outer side of the upper surface of the second roller mounting seat 53. By adopting the structure, the fixing plate 516 has a propping effect on the second roller mounting seat 53, so that the second roller mounting seat 53 is more firmly mounted, and the second roller mounting seat 53 can be effectively prevented from being overturned in the guide bottom plate 511.

Preferably, the guide mechanism 5 further includes a side abutting device, the side abutting device includes an abutting mounting seat 55, an abutting pressing plate 56 and an abutting driving device 57 for driving the abutting pressing plate 56 to move horizontally, the abutting mounting seat 55 is connected to the guide side plate 512, the abutting driving device 57 is horizontally arranged on the abutting mounting seat 55, the abutting pressing plate 56 is vertically arranged, the abutting pressing plate 56 is arranged in parallel with the side wall of the track bed 94, so that the abutting pressing plate 56 is parallel to the side wall of the track bed 94, and the power output end of the abutting driving device 57 is connected to the abutting pressing plate 56. By adopting the structure, after the alignment of the frame 1 is finished, the abutting driving device 57 drives the abutting pressing plate 56 to abut against and attach to two sides of the track bed 94, so that the frame 1 is fixed, the frame 1 is prevented from moving and deviating in the cutting process of the cutting device 2, and the processing precision of the cutting device 2 is enhanced.

Preferably, the abutting driving device 57 is an oil cylinder, and the oil cylinders are communicated with each other, so that an oil cylinder system can be balanced, the oil cylinders can apply similar force at the same time, and the stability of the system is improved.

Preferably, in the second step and the third step, the frame 1 is positioned through the aligning mechanism, and the frame 1 is adjusted to be parallel to the horizontal reference surface, the aligning mechanism 3 comprises a plurality of groups of aligning clamping jaw sets correspondingly arranged along the front-back direction of the frame 1, each aligning clamping jaw set comprises two aligning clamping jaws 31 symmetrically arranged on two sides of the frame 1 in a bilateral symmetry manner, and the two aligning clamping jaws 31 in the same group of aligning clamping jaw sets are matched and fixedly connected with the two sleepers 91 in the same transverse row respectively.

After adopting above-mentioned structure, arrange along orbital extending direction and be equipped with multirow sleeper group, every row of sleeper group includes two sleepers 91 that bilateral symmetry set up. When the rack 1 is aligned, if the rail is a linear rail, the sleeper groups on the rail are arranged along the linear direction, two groups of sleeper groups arranged in the front and back are selected as positioning sleeper groups, and the front and back groups of alignment clamping jaw groups are respectively matched with the front and back groups of alignment sleeper groups on the rail, so that the rack 1 is fixed and positioned, and the front and back directions of the rack 1 are ensured to be parallel to the extension direction of the linear rail.

As shown in fig. 4, in an actual working environment, the rails are not all straight rails, but curved rails may also occur, and the sleepers 91 are arranged along the extended curve of the rails, so that there is a very small angular offset between the front sleepers 91 and the rear sleepers 91. When the movable rack 1 is aligned, the front and rear groups of aligning clamping jaw sets are respectively matched and positioned with the front and rear groups of aligning sleeper sets, the structure of the movable rack 1 is a rectangular frame structure and has certain metal elasticity, the movable rack 1 can deform in a small amplitude, the front end of the movable rack 1 deflects towards the bending direction of a track, the front and rear directions of the movable rack 1 deflect towards the bending direction of the track, the front and rear directions of the movable rack 1 are attached to the bending direction of the track as far as possible, a cutter head 21 walking along the front and rear directions of the rack 1 on the rack 1 and a profile surface 92 of the offset sleeper 91 can conveniently perform cutter setting and front and rear cutter feeding to cut the sleeper 91, and the cutter setting and cutting machining accuracy is enhanced.

Preferably, in this embodiment, the alignment mechanism 3 includes two sets of alignment clamping jaw sets, one set of alignment clamping jaw sets is mounted at the lower end of the first frame rod 11, and the other set of alignment clamping jaw sets is mounted at the lower end of the second frame rod 12.

Preferably, the aligning clamping jaw 31 comprises a die head 32 and a jacking driving device 33, the jacking driving device 33 is arranged on the rack 1, a power output end of the jacking driving device 33 is connected with the die head 32 and drives the die head 32 to vertically move, a fixing groove 321 is arranged below the die head 32, and the fixing groove 321 is connected with the sleeper 91 in a matching manner. After the structure is adopted, when the cutting equipment moves, the jacking driving device 33 drives the die head 32 to ascend and recover, so that the rack 1 can move on the track bed 94 conveniently, and when the rack 1 is fixed, the jacking driving device 33 drives the die head 32 to descend and enables the fixing groove 321 of the die head 32 to be matched with the sleeper 91. In addition, as shown in fig. 5, S represents a horizontal reference plane, and if the rail is in an upwarp state, the ground is subjected to stress variation and drives the sleeper 91 to upwarp together, so that the machine frame 1 fixed to the sleeper 91 and the horizontal reference plane are inclined to each other, but the cutting head 21 needs to be vertically lifted and lowered with the horizontal reference plane as a horizontal reference to machine the sleeper 91, and thus the machine frame 1 needs to be adjusted to be parallel to the horizontal reference plane. When the jacking driving device 33 drives the die head 32 to be matched and fixed with the sleeper 91, the jacking driving device 33 positioned at the lower end of the rail arching surface can jack the machine frame 1 upwards, so that the machine frame 1 is adjusted to be parallel to the horizontal reference surface.

Preferably, because the left and right sides upper surface of sleeper 91 is the arcwall face, in order to make fixed slot 321 and sleeper 91 cooperation more closely laminate, fixed slot 321 has first arcwall face 322 and the second arcwall face 323 of laminating with sleeper 91 upper surface, first arcwall face 322 is established in the one end that die head 32 is close to frame 1 inboard, and first arcwall face 322 extends and upwards arches gradually to die head 32 middle part direction by the die head 32 outside, the one end that die head 32 is close to frame 1 outside is established to second arcwall face 323, second arcwall face 323 extends and upwards arches gradually to die head 32 middle part direction by the die head 32 outside. When the track is a curved track, the front end of the rack 1 inclines and deviates towards the bending direction of the track, so that the fixing groove 321 of the alignment clamping jaw 31 at the front end of the rack 1 cannot be completely attached and matched with the upper surface of the sleeper 91, and only the friction force generated by the local attaching surfaces between the first arc-shaped surface 322 and the second arc-shaped surface 323 as well as the upper surface of the sleeper 91 can be relied on to fix the alignment clamping jaw 31 and the sleeper 91, and the first arc-shaped surface 322 and the second arc-shaped surface 323 also have the function of guiding along the same direction, so that the fixing groove 321 can slide downwards to be embedded with the sleeper 91 conveniently.

Preferably, sleeper base 93 still is equipped with in sleeper 91's below, the one end that die head 32 below is close to frame 1 inboard is equipped with horizontal binding face 324, horizontal binding face 324 is connected with first arcwall face 322, when fixed slot 321 and sleeper 91 fixed fit, horizontal binding face 324 and sleeper base 93's upper surface laminating, improve fixed slot 321 and sleeper 91's degree of cooperation, horizontal binding face 324 and sleeper base 93's upper surface can produce frictional force simultaneously, thereby prevent die head 32 deflection, make die head 32 and sleeper 91 cooperation more firm.

Preferably, when the frame 1 is adjusted to be parallel to the horizontal reference surface, the jacking driving device 33 will be adjusted to be in position along with the frame 1, and the die head 32 and the sleeper 91 are fixed and do not move, so that the angle between the output end of the jacking driving device 33 and the connection part of the die head 32 will be changed, and therefore, the power output end of the jacking driving device 33 needs to be rotatably connected with the die head 32, and the connection part of the jacking driving device 33 and the die head 32 is prevented from being disconnected due to the angle change.

Preferably, in this embodiment, in order to enable the die head 32 to be rotatably connected with the output end of the jacking driving device 33, the alignment clamping jaw 31 further includes a die head rotating shaft 34 and an adaptor 35, the upper end of the adaptor 35 is connected with the power output end of the jacking driving device 33, the lower end of the adaptor 35 is provided with a through hole, and the die head rotating shaft 34 is inserted into the through hole and rotatably connected with the adaptor 35; the upper surface of the die head 32 is provided with a mounting groove 36, the side walls of the left and right sides of the mounting groove 36 are provided with connecting holes 361 penetrating through the die head 32, and both ends of the die head rotating shaft 34 are rotatably connected with the connecting holes 361, respectively. With the adoption of the structure, in the process of adjusting the frame 1, the die head 32 can rotate around the die head rotating shaft 34 by taking the axis of the die head rotating shaft 34 as a center.

More preferably, in order to further fix the die rotating shaft 34, the die 32 further comprises a die fixing block 37 which is connected in the mounting groove 36 in a fitting manner, the lower surface of the die fixing block 37 is provided with an upper fitting groove 371 for the die rotating shaft 34 to be fitted in, and an abdicating hole 372 for the adaptor 35 to pass through; the bottom of the mounting groove 36 is provided with a lower fitting groove 362 for fitting the die rotating shaft 34, and an avoiding groove 363 for fitting the adaptor 35.

Preferably, the alignment clamping jaw 31 further comprises a connecting block 15 and a die head guide column 38, the connecting block 15 is connected below the frame 1, the connecting block 15 is provided with a first guide through hole 151 vertically penetrating through the connecting block, and second guide through holes 152 arranged on the left and right sides of the first guide through hole 151 and symmetrically arranged relative to the first guide through hole 151; the power output end of the jacking driving device 33 is arranged through the first guide through hole 151, the upper end of the die head guide column 38 extends into the second guide through hole 152 to be connected in a sliding manner, and the lower end of the die head guide column 38 is connected with the die head 32 in a rotating manner. Specifically, the lower end of the die head guide column 38 is also provided with the adapter 35, and the adapter 35 is rotatably connected with the die head rotating shaft 34, so that the die head guide column 38 and the die head 32 can rotate relatively. With the above structure, the die head 32 is more firmly installed, and is guided by the die head guide post 38, so that the die head 32 is more stable and smooth in the ascending and descending processes, and the die head 32 can be prevented from deflecting in the left and right directions.

Preferably, the jacking driving device 33 includes a jacking servo motor 331, a jacking screw rod 332 and a jacking screw rod nut 333, the jacking servo motor 331 is vertically disposed on the frame 1, an output shaft of the jacking servo motor 331 is connected with the jacking screw rod 332, and the jacking screw rod nut 333 is fixed in the first guiding through hole 151 in a penetrating manner. After the structure is adopted, the jacking servo motor 331 drives the jacking screw rod 332 to rotate relative to the jacking screw rod nut 333, so that the die head 32 at the lower end of the jacking screw rod 332 is driven to ascend or descend, and the motor drive is adopted, so that the lifting screw rod mechanism is small in size, light in weight and high in transmission efficiency.

Preferably, in the third step, the cutting head 21 performs front-back, left-right and up-and-down movements on the frame 1 by the head moving driving mechanism, and the cutting head 21 is driven to rotate by the head rotating driving device 22; the cutter head movement driving mechanism includes a longitudinal movement driving device 23 that drives the cutting cutter head 21 to move in the front-rear direction of the frame 1, a lateral movement driving device 24 that drives the cutting cutter head 21 to move in the left-right direction of the frame 1, and a vertical movement driving device 25 that drives the cutting cutter head 21 to perform an elevating motion. The longitudinal movement driving device 23 drives the cutting tool bit 21 to move along the X-axis direction, so that the cutting tool bit 21 can be adjusted to be close to the sleeper 91, and the sleeper 91 can be cut. The transverse movement driving device 24 and the vertical movement driving device 25 respectively drive the cutting head 21 to move along the Y-axis direction and the Z-axis direction, so that the relative position of the cutting head 21 and the profile surface 92 of the sleeper 91 is adjusted, and the tool setting of the cutting head 21 is facilitated.

Preferably, the cutter head moving and driving mechanism further comprises a moving support beam 26 extending along the left and right direction of the frame 1, two ends of the moving support beam 26 are slidably connected with the left and right sides of the frame 1, the two cutting cutters 21 are respectively connected with the left and right ends of the moving support beam 26, and the power output end of the longitudinal moving and driving device 23 is connected with the moving support beam 26. After adopting above-mentioned structure, longitudinal movement drive arrangement 23 drive removes corbel 26 and removes along X axle direction in the frame to drive two cutting tool bits 21 simultaneous movement, make two cutting tool bits 21 respectively can be to two sleepers 91 of same row simultaneously after the tool setting.

More preferably, in this embodiment, the longitudinal movement driving device 23 includes a first motor 231 and a first lead screw 232, the first motor 231 is disposed on the frame 1, and a power output end of the first motor 231 is connected to the first lead screw 232; the first lead screw 232 is horizontally disposed and screwed to the movable corbel 26, and the first lead screw 232 is vertically disposed to the movable corbel 26. With this structure, the first motor 231 drives the first lead screw 232 to rotate, thereby driving the movable support beam 26 to move in the X-axis direction; the motor and the screw rod are adopted for transmission, so that the transmission efficiency is high, the precision is high, the noise is low, and the reciprocating transmission is suitable for high-speed reciprocating transmission.

Preferably, in order to make the movable beam 26 more stable during movement, the left and right sides of the frame 1 are further provided with first guide rails 18 extending along the X-axis direction, the extending direction of the first guide rails 18 is parallel to the extending direction of the first lead screw 232, and the two ends of the movable beam 26 are provided with first guide chutes 261 sliding in cooperation with the first guide rails 18.

Preferably, the cutter head moving driving mechanism further comprises a bearing frame 27, the bearing frame 27 is sleeved on the moving support beam 26 and is in sliding connection with the moving support beam 26, the transverse moving driving device 24 is arranged on the side edge of the moving support beam 26, and the power output end of the transverse moving driving device 24 is connected with the moving support beam 26.

Preferably, in order to make the carrying frame 27 move more stably, the movable supporting beam 26 is further provided with a second guiding sliding rail 262 arranged along the extending direction of the movable supporting beam 26, and the carrying frame 27 is provided with a second guiding sliding groove 271 sliding in cooperation with the second guiding sliding rail 262.

Preferably, a plurality of guide pulleys 272 are further provided on the carrying frame 27. The guide pulley 272 is rotatably coupled to the carrier frame 27, and the outer circumferential surface of the guide pulley 272 is engaged with and rolled by the movable beam 26. With this structure, the movement of the carrier frame 27 on the movable corbel 26 is made more stable.

More preferably, in this embodiment, the lateral movement driving device 24 includes a second motor 241 and a second lead screw 242, a power output end of the second motor 241 is in transmission connection with the second lead screw 242, the second lead screw 242 extends along the Y-axis direction, a threaded sleeve in threaded fit with the second lead screw 242 is disposed on the carrying frame 27, and with this structure, the second motor 241 drives the second lead screw 242 to rotate, so as to drive the carrying frame 27 to move along the Y-axis direction; the motor and the screw rod are adopted for transmission, so that the transmission efficiency is high, the precision is high, the noise is low, and the reciprocating transmission is suitable for high-speed reciprocating transmission.

Preferably, the cutter head movement driving mechanism further comprises a mounting frame 28, the vertical movement driving device 25 is connected to the mounting frame 28, the power output end of the vertical movement driving device 25 is connected to the carrying frame 27, and the cutter head rotation driving device 22 of the cutting cutter head 21 is arranged on the mounting frame 28. After adopting the above structure, the vertical movement driving device 25 drives the mounting frame 28 to perform vertical lifting movement relative to the bearing frame 27, so as to drive the cutting head 21 to perform lifting movement in the Z-axis direction, adjust the height position of the cutting head 21, and further facilitate the fitting and tool setting of the cutting head 21 and the profile surface 92 of the sleeper 91.

More preferably, in this embodiment, the vertical movement driving device 25 includes a third motor 251, a transmission screw rod 252 and two third screw rods 253, the transmission screw rod 252 is horizontally disposed along the X-axis direction, the third screw rod 253 is vertically disposed, a power output end of the third motor 251 is in transmission connection with the transmission screw rod 252, two ends of the transmission screw rod 252 are in transmission connection with the third screw rod 253, and a specific connection manner may be in transmission connection with a speed reducer. The front and rear sides of the carrying frame 27 are correspondingly provided with thread blocks 273, and the third screw 253 is in threaded connection with the thread blocks 273. After the structure is adopted, the third motor 251 drives the transmission screw rod 252 to rotate, and the transmission screw rod 252 drives the third screw rods 253 at the two ends to rotate in the same direction, so that the third screw rods 253 ascend or descend relative to the thread blocks 273, and the installation frame 28 is jacked up or pulled down, so that the installation frame 28 moves along the Z-axis direction. And the third lead screw 253 drives the mounting frame 28 from the front side and the rear side simultaneously, so that the mounting frame 28 is lifted more stably, and the front and rear stress is more balanced.

Preferably, since the cutting head 21 and the head rotation driving means 22 have heavy weights, the bearing force of the third motor 251 and the third lead screw 253 cannot fully bear the weight of the cutting head 21 and the head rotation driving means 22, and the mounting frame 28 may slip down due to insufficient support during cutting. The front and rear sides of the carrying frame 27 are therefore also provided with support cylinders 274, the power take-off of the support cylinders 274 being arranged vertically upwards and connected to the mounting frame 28. With this structure, the front and rear sides of the mounting frame 28 are supported by the support cylinder 274, and the support force against the mounting frame 28 is increased.

Preferably, the supporting cylinder 274 is a hydraulic cylinder, and the hydraulic cylinder has a larger output bearing capacity, stronger stability and is convenient to maintain.

Preferably, the mounting frame 28 is further provided with a plurality of vertically arranged frame guide posts 281, and the carrying frame 27 is provided with a plurality of frame guide sleeves 275 corresponding to the frame guide posts 281, wherein the frame guide posts 281 extend into the frame guide sleeves 275 for sliding connection. Specifically, the mounting frame 28 is provided with two guide pillar mounting plates 282 which are correspondingly arranged up and down, and the guide pillar mounting plates 282 are rectangular structures; the number of the frame guide pillars 281 is four, the upper end and the lower end of the frame guide pillars 281 are connected to the guide pillar mounting plate 282, and the four frame guide pillars 281 are respectively connected to four corners of the guide pillar mounting plate 282, so that each frame guide pillar 281 is more uniformly stressed. By adopting the structure, the stability of the lifting motion of the mounting frame 28 is further improved.

Preferably, in order to accurately set the cutting bit 21 and the sleeper 91, the cutting bit 21 needs to be rotated on the plane of the coordinate axis YOZ, and an included angle between the rotation axis of the cutting bit 21 and the Y axis is adjusted, so that an angle between the machining surface of the cutting bit 21 and the profile surface 92 is adjusted, and the machining surface can be closely attached to the profile surface 92. In order to solve the above problem, the mounting frame 28 includes a connecting frame 283, a rotating frame 284 and a rotating mechanism, the rotating frame 284 is provided with two connecting arms 2842, both ends of the rotating shaft of the cutting head 21 are rotatably connected with the two connecting arms 2842, respectively, and the head rotation driving device 22 is provided above the rotating frame 284. Be equipped with fixed connection's rotation main shaft 285 on the link 283, the rotating turret 284 is equipped with the first through-hole 2841 that rotates that passes rotation main shaft 285, slewing mechanism establishes on link 283 and drives rotating turret 284 and revolve the relative link 283 of rotation main shaft 285 and rotate, drive cutting tool bit 21 and rotate on coordinate axis YOZ face to adjust the pivot of cutting tool bit 21 and the contained angle between the Y axle, make cutting tool bit 21 can laminate more with the profile surface 92 of sleeper 91, the tool setting is more accurate.

Preferably, the rotating mechanism comprises a cam 286, a fourth motor 287, a fourth screw rod 288, and a thread rotating block 289, the cam 286 is fixedly connected with the rotating frame 284, the cam 286 has a connecting portion connected with the rotating frame 284, the connecting portion is provided with a second rotating through hole 2861 which is matched and rotatably connected with the rotating main shaft 285, the connecting portion is provided with a convex portion protruding towards the outer side surface of the connecting portion, and the thread rotating block 289 is rotatably connected with the convex portion. The fourth motor 287 is horizontally disposed on the coupling frame 283, and an output end of the fourth motor 287 is coupled to a fourth lead screw 288, and the fourth lead screw 288 is horizontally disposed and screw-coupled to the screw block 289. With the above structure, before rotation, the rotation shaft of the cutter head 21 is in a horizontal position and parallel to the Y axis, and when rotation is performed, the fourth motor 287 drives the fourth screw rod 288 to rotate, so that the screw rotation block 289 moves horizontally along the fourth screw rod 288. When the thread turning block 289 moves rightwards along the fourth screw rod 288, the driving cam 286 rotates anticlockwise so as to drive the turning frame 284 to rotate anticlockwise relative to the connecting frame 283, an included angle is formed between the rotating shaft of the cutting head 21 and the Y axis, and the height of the right end of the rotating shaft is lower than that of the left end of the rotating shaft; when the screw rotating block 289 moves leftwards along the fourth screw rod 288, the driving cam 286 rotates clockwise, so as to drive the rotating frame 284 to rotate clockwise relative to the connecting frame 283, at this time, an included angle is formed between the rotating shaft of the cutting head 21 and the Y axis, and the height of the right end of the rotating shaft is higher than that of the left end of the rotating shaft.

Preferably, the bellying is equipped with third rotation through-hole 2862, and screw rotating block 289 is equipped with outside bellied rotation protruding axle 2891, rotates protruding axle 2891 embedding third rotation through-hole 2862 internal rotation and connects, adopts this structure, and screw rotating block 289's connection structure is simple to make things convenient for the dismouting.

Preferably, the rotating frame 284 is further provided with a plurality of bar-shaped arc holes 2843 using the rotating main shaft 285 as a center, the connecting frame 283 is provided with a plurality of guiding limit screws 2831, and the guiding limit screws 2831 penetrate through the bar-shaped arc holes 2843 and are locked with the connecting frame 283. Adopt direction stop screw 2831 and the cooperation of bar arc hole 2843, play the guide effect to rotating turret 284, make rotating turret 284 rotate more steadily. Meanwhile, when the guide limit screw 2831 abuts against the side wall of the bar-shaped arc hole 2843, the rotating frame 284 stops rotating, and the rotating frame 284 is limited.

Preferably, after the rotating frame 284 is adjusted in a rotating manner, in order to avoid the rotating frame 284 from deflecting during cutting, arc plates 2844 protruding outwards are further arranged on two sides of the rotating frame 284, abutting cylinders 2832 are arranged on two sides of the connecting frame 283, an abutting die head 2833 is arranged on a piston rod of the abutting cylinder 2832, the abutting cylinder 2832 drives the abutting die head 2833 to abut against or be away from the arc plates, and arc grooves for matching and attaching the arc plates 2844 are formed in the side surfaces of the abutting die head 2833. After the structure is adopted, before the rotating frame 284 rotates and is adjusted, the abutting oil cylinder 2832 drives the abutting die head 2833 to be attached to the arc-shaped plate 2844, so that the rotating frame 284 can rotate conveniently and plays a role in guiding; after the rotating frame 284 is adjusted in a rotating manner, the abutting oil cylinder 2832 drives the abutting die head 2833 to abut against the arc-shaped plate 2844, so that the rotating frame 284 is further fixed, and the rotating frame 284 is prevented from deflecting. And the peripheral face of arc 2844 adopts the arc structure with the tank bottom surface of arc, no matter how many angles rotating turret 284 rotated, the arc all the time can closely laminate with arc 2844.

The during operation, cutting equipment has the orientation to frame 1 and adjusts mechanism 3 well, mechanism 3 is adjusted well to being equipped with two sets of front and back correspondences and adjusts the clamping jaw group well, and every group is adjusted well clamping jaw group well and is had two clamping jaws 31 well that set up side by side to with the group adjust well two in the clamping jaw group well and adjust clamping jaw 31 well respectively with the track on with two mutual cutting ferrule of sleeper 91 of one row fixed, make the orientation adjust to parallel with orbital extending direction around frame 1. Then the four jacking driving devices 33 jack up the rack 1 respectively to adjust the rack 1 to be parallel to the reference horizontal plane, and then the abutting driving device 57 drives the abutting pressing plate 56 to abut against the side wall of the track bed 94, so that the rack 1 is fixed on the track bed 94. Then, the cutting devices 2 disposed on the left and right sides of the machine frame 1 are moved to two sleepers 91 in the same row respectively by the tool bit moving driving mechanism to perform tool setting, the mounting frames 28 are respectively provided with laser detectors, the laser detectors use the upper surface of the sleeper base 93 as a reference surface, then the cutting tool bit 21 is lowered to a height equal to the cutting thickness, and the tool bit rotating driving device 22 drives the cutting tool bit 21 to rotate to perform cutting processing on the profile surface 92 of the sleeper 91. Later change cutting off tool bit 21 for milling cutter head again, carry out further trueing to sleeper 91 profile surface 92, improve the precision of milling, reduce the surface roughness of profile surface 92 simultaneously, improve and mill the quality, convenient later sleeper 91 and rail installation cooperation.

Compared with the prior art, the method has the advantages that the cutting tool bit 21 can be accurately aligned with the profile surface of the sleeper by orienting and positioning the cutting device 2; and the cutter head moving driving mechanism drives the cutter head 21 to mill the profile surface of the sleeper to sink the steel rail, the horizontal reference of the steel rail line is readjusted, the smoothness of the line is ensured, and the upwarp defect is eliminated, so that the running speed and the running stability of the railway line are ensured.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims (10)

1. A method for eliminating arch faults on railway sleepers is characterized by comprising the following steps:

the method comprises the following steps: moving a frame of the cutting device above a sleeper to be cut;

step two: the frame of the cutting device and the sleeper are fixed, and the front and back directions of the frame are consistent with the extending direction of the rail as much as possible.

Step three: the frame is adjusted to be parallel to the horizontal reference plane.

Step four: and (3) cutting the profile surface of the cutting tool bit of the cutting device close to the sleeper to ensure that the cutting tool bit is attached to the profile surface of the sleeper.

Step five: and driving the cutting tool head to cut the profile surface of the sleeper.

Step six: and replacing the cutting tool bit with a milling tool bit, and milling the profile surface of the sleeper.

2. A method for eliminating crown faults on railroad ties according to claim 1, wherein in step one, the frame is driven to move on the track bed by a moving mechanism, the automatic roller mechanism comprises a first roller, a first roller mounting seat, a first roller rotating shaft and a roller motor, the first roller mounting seat is arranged below the frame and is provided with two first roller mounting plates which are arranged vertically and correspondingly from left to right, the first roller mounting plate is provided with a first roller rotating shaft connecting hole, the first roller rotating shaft extends into the first roller rotating shaft connecting hole for rotating connection, the first roller is sleeved on the first roller rotating shaft and arranged between the two first roller mounting plates, the roller motor is arranged on the first roller mounting plate, and the power output end of the roller motor is connected with the first roller rotating shaft.

3. The method for eliminating crown faults on railway sleepers as claimed in claim 2, wherein the moving mechanism comprises four automatic roller mechanisms, the frame is a rectangular frame, roller connecting feet extending downwards are arranged below four top corners of the frame, and the automatic roller mechanisms are arranged on the roller connecting feet.

4. A method of eliminating crown faults on railroad ties as claimed in claim 2, wherein in step one, the frame is guided by a guide mechanism while moving on the track bed, the guide mechanism including a guide mounting frame rotatably coupled to the frame and guide rollers horizontally disposed and rotatably coupled to a lower end of the guide mounting frame.

5. The method for eliminating crown defects on railroad ties as claimed in claim 4, wherein the guiding mechanism further comprises a side abutting device, the side abutting device comprises an abutting mounting seat, an abutting pressing plate and an abutting driving device for driving the abutting pressing plate to move horizontally, the abutting mounting seat is connected to the guiding side plate, the abutting driving device is horizontally arranged on the abutting mounting seat, the abutting pressing plate is vertically arranged, the abutting pressing plate and the guiding side plate are arranged vertically, and a power output end of the abutting driving device is connected with the abutting pressing plate.

6. The method for eliminating crown faults on railroad ties according to claim 1, wherein in the second step and the third step, the frame is positioned by an aligning mechanism and adjusted to be parallel to a horizontal reference plane, the aligning mechanism comprises a plurality of aligning clamping jaw sets correspondingly arranged along the front and back directions of the frame, each aligning clamping jaw set comprises two aligning clamping jaws symmetrically arranged on the left side and the right side of the frame, and the aligning clamping jaws are matched and connected with the ties.

7. The method for eliminating the crown defect on the railway sleeper as claimed in claim 6, wherein the alignment clamping jaw comprises a die head and a jacking driving device, the jacking driving device is arranged on the frame, a power output end of the jacking driving device is connected with the die head and drives the die head to vertically move up and down, a fixing groove is arranged below the die head, and the fixing groove is connected with the sleeper in a matching manner.

8. The method for eliminating crown defects on railroad ties according to claim 7, wherein the fixing groove has a first arc surface and a second arc surface, the first arc surface is arranged at one end of the die head close to the inner side of the frame, the first arc surface extends from the outer side of the die head to the middle of the die head and gradually arches upwards, the second arc surface is arranged at one end of the die head close to the outer side of the frame, and the second arc surface extends from the outer side of the die head to the middle of the die head and gradually arches upwards.

9. The method for eliminating crown faults on railroad ties according to claim 8, wherein a horizontal abutting surface is provided at an end below the die head adjacent to the inner side of the frame, and the horizontal abutting surface is connected with the first arc-shaped surface.

10. A method of eliminating crown molding on railroad ties as claimed in claim 6 wherein said alignment mechanism includes two sets of alignment jaw sets disposed fore and aft of the frame.

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