CN113751777A

CN113751777A - Online repair milling cutter for railway track

Info

Publication number: CN113751777A
Application number: CN202111057148.5A
Authority: CN
Inventors: 王梦超; 陈红杰; 史娇; 范晓海
Original assignee: Meigoli Zhejiang Rail Transit Research Institute Co ltd
Current assignee: Meigoli Zhejiang Rail Transit Research Institute Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2021-12-07

Abstract

The invention provides an on-line repairing milling cutter for a railway track, and belongs to the technical field of railway industry. The milling cutter solves the problems that the blade of the existing milling cutter for repairing the railway track is inconvenient to replace, the overall replacement cost is high after damage, the accumulated assembly error is large, the profile precision is difficult to guarantee, and the repairing effect is not ideal. This milling cutter is restoreed on line to railway track, including blade disc and a plurality of modularization cutter holder along blade disc outer wall circumference distribution, can dismantle on the modularization cutter holder to be connected with a plurality of and be used for the prosthetic blade to the disease track, a plurality of modularization cutter holder passes through the fastening bolt external member and connects on the perisporium of blade disc, has the clearance between the two adjacent modularization cutter holder. The invention has the advantages of simple and reliable structure, short assembly time, convenient and accurate adjustment of the outline, good repairing effect, high surface evenness of the repaired railway track, accurate track outline and stable operation of high-speed carrying equipment.

Description

Online repair milling cutter for railway track

Technical Field

The invention belongs to the technical field of railway industry, and relates to an on-line repairing milling cutter for a railway track.

Background

The rail transit is a life line of national economy of China and a backbone network of traffic transportation, not only undertakes most national strategies and transportation of economic materials, but also undertakes the function of passenger transportation, and plays a great role in promoting resource transportation of China, strengthening communication of economic areas, solving the problem of urban traffic congestion and the like.

The railway track is an important component of rail traffic, provides a continuous and smooth rolling surface for wheels of carrying equipment, and bears huge pressure of the wheels; particularly, under the condition of high speed and heavy load, a series of diseases such as flash, rail top surface scratch or peeling, wave-shaped abrasion, fish scale marks and the like can occur on the railway track after continuous and repeated rolling of wheels, so that the track abrasion is accelerated, and the safe operation of track traffic is influenced; meanwhile, the rail track subjected to abrasion and indentation changes the normal wheel-rail relationship, so that the problems of obvious vibration and high noise can occur in the running process of high-speed carrying equipment, and the riding experience and safety of passengers are seriously influenced.

In order to prevent and cure railway track diseases, improve the matching relationship of wheel rails and prolong the service life, the rails need to be repaired. At present, the damaged rail is repaired in two ways, namely grinding and online milling repair. The former has low efficiency and large noise and dust pollution; the latter is a new repairing method with the characteristics of high efficiency and rapidness, so that the method becomes a repairing technology with development potential.

The on-line repairing milling cutter is used as a core component for milling and repairing the railway track, and the reliability of the on-line repairing milling cutter directly determines the repairing effect of the railway track. The steel rail materials widely used on railways in China are U71Mn and U75V, the structures of the steel rail materials contain more pearlite, the dispersity is high, and the steel rail materials have high strength, toughness, plasticity and fatigue performance, so that the milling cutter faces the problems of large vibration, impact and cutting force and high abrasion in the working process. The milling cutter used at present has two types of integral type and split type: the integral cutter head has heavy weight, the blades are inconvenient to replace, and the overall replacement cost is high after damage; and the split cutter head has the problems of long installation time, large accumulated assembly error, difficult guarantee of profile precision and the like due to a plurality of components, so that the repair effect is not ideal.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides the on-line repairing milling cutter which can repair a damaged railway track on line, has a simple and reliable structure, short assembling time, convenient and accurate profile adjustment and good repairing effect, ensures that the repaired railway track has high surface flatness and accurate track profile, and is stable in running of high-speed carrying equipment.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a railway track restores milling cutter on line, its characterized in that includes blade disc and a plurality of modularization cutter holder along blade disc outer wall circumference distribution, modularization cutter holder on can dismantle and be connected with a plurality of and be used for the prosthetic blade to the disease track, a plurality of modularization cutter holder passes through the fastening bolt external member and connects on the perisporium of blade disc, has the clearance between the two adjacent modularization cutter holder.

In one of the above-described railway track on-line restoration milling cutters, the insert is mounted to a modular toolholder by a fastening screw.

In the above-mentioned milling cutter for on-line repairing of railway tracks, the blade is square.

In the milling cutter for on-line repairing of railway tracks, the blade is provided with four arc-shaped surfaces which are in axial symmetry, and the arc-shaped surfaces are provided with four arc-shaped cutting edges in total.

In the above-mentioned on-line repairing milling cutter for railway rails, the blade has four straight cutting edges.

In the milling cutter for on-line repairing of the railway track, the blade is provided with four arc-shaped curved surfaces arranged along the circumferential direction of the blade surface, and the four cutting edges formed by the linear cutting edges and the arc-shaped cutting edges are arranged on the arc-shaped curved surfaces.

In the above-mentioned milling cutter for on-line repairing of railway track, the peripheral wall of the cutter head is provided with a limit step ring for installing a plurality of modular cutter holders and axially limiting each modular cutter holder, the inner peripheral wall of the modular tool holder is provided with a limit groove for forming axial limit by being clamped with the limit step ring, the limiting step ring is provided with a plurality of radial limiting grooves I which are distributed at intervals along the circumferential direction, a radial limiting groove II is arranged on the groove wall of the limiting groove of the modular tool holder at the position corresponding to each radial limiting groove I, the corresponding radial limiting groove I is communicated with the radial limiting groove II in a combined manner to form a radial limiting groove body, and power parts for radially limiting the corresponding modular tool holders are fixedly arranged in the radial limiting groove bodies, and the power parts are positioned in the radial limiting groove bodies through locking bolts.

In the milling cutter for on-line repairing of the railway track, the plurality of through holes are obliquely formed in the positions, corresponding to the modular tool holders, of the outer edge of the cutter head, the plurality of screw holes communicated with the corresponding through holes are obliquely formed in the inner wall of each modular tool holder, and the fastening bolt sleeve extends into the through holes and is in threaded connection with the corresponding screw holes.

In the milling cutter for on-line repairing of railway tracks, an included angle gamma degrees is formed between the central axis of the fastening bolt sleeve and the longitudinal section line of the cutter head.

In the above-mentioned milling cutter for on-line repairing of railway track, the inner end part of the modular cutter holder is a dovetail structure, a cutter holder dovetail groove for installing a cutter head is formed between the two modular cutter holders, the peripheral wall of the cutter head is provided with a plurality of power components which are fixedly connected with the dovetail grooves of the corresponding cutter holder, the power parts are also in a dovetail tenon structure, a cutter head dovetail groove for fixedly connecting the inner end parts of the modular cutter holders is arranged between the two power parts, the front end part of the modular tool holder is provided with a limiting part which is abutted against the corresponding end surface of the cutter head so as to realize axial limiting to the modular tool holder, the limiting part is internally provided with a cutter holder screw hole, the cutter head is provided with a cutter head screw hole at the position corresponding to the cutter holder screw hole, the tool holder screw hole and the tool disc screw hole are connected through the fastening bolt kit, and an adjusting gasket fixed by the fastening bolt kit is further arranged between the tool disc and the modular tool holder.

In the milling cutter for on-line repairing of the railway track, the blade is internally provided with a hollow threaded sleeve for a fastening screw to extend into and connect with, a cutter pad is arranged at the joint of the blade and the modular cutter holder, and the inner end of the hollow threaded sleeve extends into the cutter pad to fix the cutter pad on the hollow threaded sleeve.

In the milling cutter for on-line repairing of the railway track, the shim is made of coarse-grain hard alloy.

Compared with the prior art, the on-line repairing milling cutter for the railway track has the advantages that:

1. through a plurality of blade structures with different specifications and a plurality of modularized tool holders which are separately assembled with the cutter head in a lap joint mode, reasonable installation layout is adopted, the maximum repairing effect is achieved, and the repaired track achieves the most reasonable and highest flatness;

2. the modular tool holder is accurately positioned on the cutter head through two simple and effective fixing modes, for example, the fastening mode of a dovetail groove with a simple structure achieves high connection strength, and the modular tool holder has the advantages of simple fastening structure, high positioning precision, convenience in disassembly and maintenance and convenience in calibration of a milling contour;

3. the detachable design of the blade can realize independent replacement, and the whole cutter does not need to be replaced after the blade is worn, so that the replacement cost is reduced;

4. the cutter pad has higher hardness and shock resistance, can protect the modular cutter holder, reduce vibration, ensure assembly precision and compensate profile distortion caused by thickness difference of the blade;

5. the requirements of different steel rail profile rail types are met by replacing modular tool holders with different specifications or replacing tool pads with different thicknesses;

6. the application fields are wide, including the fields of high-speed rails, subways, light rails and the like, the universality is high, and the method brings extremely high convenience to the repair of rail transit.

Drawings

Fig. 1 is a schematic front view of a milling cutter for on-line repair of a railway track according to a first embodiment.

Fig. 2 is a schematic sectional structure view of the first embodiment of the milling cutter for on-line repairing of railway tracks.

Fig. 3 is a schematic side view of a milling cutter for on-line repair of railway tracks according to an embodiment.

Fig. 4 is a schematic view of a configuration of one of the plurality of blades.

Fig. 5 is a schematic view of the structure of one of the plurality of blades.

Fig. 6 is a schematic view of the structure of one of the plurality of blades.

Fig. 7 is a perspective view of a modular toolholder according to a first embodiment.

Fig. 8 is a partial structural schematic view of the first embodiment of the on-line repair milling cutter for railway tracks.

Fig. 9 is a partial sectional structural schematic view of the first embodiment of the on-line repairing milling cutter for railway tracks.

Figure 10 is a schematic illustration of multiple models of tracks.

FIG. 11 is a schematic plan view of a modular toolholder according to a second embodiment.

Fig. 12 is a simplified view, partially in section, of a modular toolholder and cutter head according to a second embodiment.

Fig. 13 is an exploded view of the second embodiment when the blade is mounted.

In the figure, 1, track; 2. a cutter head; 3. a modular tool holder; 4. a blade; 5. a fastening bolt kit; 6. Fastening screws; 7. an arc-shaped surface; 7a, an arc-shaped cutting edge; 8. a linear cutting edge; 9. an arc-shaped curved surface; 9a, a cutting blade; 10. a limiting step ring; 11. a limiting groove; 12a, a first radial limiting groove; 12b, a radial limiting groove II; 12. a radial limiting groove body; 13. a power member; 14. locking the bolt; 15. a through hole; 16. a screw hole; 17. a dovetail structure; 18. a tool holder dovetail groove; 20. A limiting part; 21. a tool holder screw hole; 22. a cutter head screw hole; 23. adjusting the gasket; 24. a hollow threaded sleeve; 25. a shim.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, the railway track on-line repairing milling cutter comprises a cutter head 2 and a plurality of modular tool holders 3 distributed along the circumferential direction of the outer wall of the cutter head 2, wherein the modular tool holders 3 are detachably connected with a plurality of blades 4 for repairing damaged tracks 1, the modular tool holders 3 are connected to the circumferential wall of the cutter head 2 through a limiting mechanism, such as a fastening bolt kit 5, and a gap is formed between every two adjacent modular tool holders 3.

In further detail, the inserts 4 are mounted on the modular tool holder 3 by fastening screws 6, and a complete rail-shaped profile requires milling of at least 8 inserts 4.

In more detail, the blade 4 is square, and the blade 4 with the square structure has various specifications, and the detailed analysis is as follows:

1. four arc surfaces 7 which are axisymmetric are arranged on the blade 4, four arc cutting edges 7a are arranged on the arc surfaces 7, the blade 4 can be divided into a plurality of specifications by the arc surfaces 7 through different radians, and the blades 4 with different specifications are arranged on the modularized cutter holder 3.

2. The insert 4 has four straight cutting edges 8.

3. The blade 4 is provided with four arc-shaped curved surfaces 9 arranged along the circumferential direction of the blade surface, the arc-shaped curved surfaces 9 are provided with four cutting edges 9a formed by linear cutting edges 8 and arc-shaped cutting edges 7a, and each cutting edge 9a is formed by two linear cutting edges 8 and one arc-shaped cutting edge 7 a.

An included angle alpha is formed between the cutting edge of the blade 4 and the corresponding tangent line of the surface of the modular tool holder 3, and the reasonable design of the included angle alpha has the function of reducing the cutting force;

meanwhile, a plurality of groups of blades 4 are arranged in an inclined straight line in the blades 4 arranged on the modular tool holder 3, and an included angle beta is formed between each group of obliquely arranged blades 4 and the transverse axis of the cutter head 2, and the impact and the vibration of the cutter head 2 can be obviously reduced through the reasonable design of the included angle beta.

The modular tool holder 3 is provided with a plurality of concave chip grooves, the tool disc 2 is a closed processing space during working, and the concave chip grooves achieve an effective scrap iron collecting and chip removing effect.

In order to achieve the positioning effects of more stability and higher precision of the cutter head 2 and the modular cutter holder 3, the applicant designs two different connection modes of the cutter head 2 and the modular cutter holder 3, and the connection modes are specifically described as follows:

the first embodiment is as follows:

the circumferential wall of the cutter head 2 is provided with a limiting step ring 10 for installing a plurality of modularized cutter holders 3 and axially limiting each modularized cutter holder 3, the inner circumferential wall of each modularized cutter holder 3 is provided with a limiting groove 11 for clamping with the limiting step ring 10 to form axial limiting, the limiting step ring 10 is provided with a plurality of radial limiting grooves 12a which are distributed at intervals along the circumferential direction, the positions, corresponding to the radial limiting grooves 12a, on the groove wall of the limiting groove 11 of each modularized cutter holder 3 are respectively provided with a radial limiting groove 12b, the corresponding radial limiting grooves 12a and the radial limiting grooves 12b are combined and communicated to form a radial limiting groove body 12, power parts 13 for radially limiting the corresponding modularized cutter holders 3 are fixedly arranged in the radial limiting groove body 12, the power parts 13 are positioned in the radial limiting groove body 12 through locking bolts 14, before the modularized cutter holders 3 are slid into the limiting step ring 10, the power part 13 is fixedly arranged on the first radial limiting groove 12a, when the modularized tool holder 3 slides into the first radial limiting step ring 10, the second radial limiting groove 12b is aligned with the first radial limiting groove 12a, namely, the upper end part of the power part 13 enters the second radial limiting groove 12b when the modularized tool holder 3 is moved, therefore, the height of the power part 13 is higher than the depth of the first radial limiting groove 12a and is equal to the height of the vertical direction of the radial limiting groove body 12, the modularized tool holder 3 on the first radial limiting step ring 10 is radially limited, and the axial and radial limited modularized tool holder 3 cannot fall off.

In further detail, the position of each corresponding modularization cutter holder 3 of outward flange of blade disc 2 all inclines to set up a plurality of and has the through-hole 15, all incline to set up a plurality of screw 16 with corresponding through-hole 15 intercommunication on each modularization cutter holder 3 inner wall, fastening bolt external member 5 stretches into in the through-hole 15 with corresponding screw 16 threaded connection, in this embodiment, two screw 16 have all been seted up on every modularization cutter holder 3 inner wall, two through-holes 15 have also been seted up to the position department of corresponding modularization cutter holder 3 on the blade disc 2 then, and screw 16 and through-hole 15 one-to-one, link to each other both through fastening bolt external member 5, thereby with the fixed locking of modularization cutter holder 3 on blade disc 2.

In further detail, an included angle gamma is formed between the central axis of the fastening bolt sleeve 5 and the longitudinal section line of the cutter head 2, and the interference of tools during the mounting and dismounting of the fastening screw 6 can be avoided through the reasonable design of the included angle gamma.

Example two:

the inner end part of the modularized tool holder 3 is a dovetail structure 17, a tool holder dovetail groove 18 for installing the tool head 2 is formed between the two modularized tool holders 3, a plurality of power parts fixedly connected with the corresponding tool holder dovetail groove 18 are arranged on the peripheral wall of the tool head 2, the power parts are also dovetail structures 17, the power parts simultaneously have the radial and circumferential positioning functions of the tool holder, a tool head 2 dovetail groove for fixedly connecting the inner end part of the modularized tool holder 3 is arranged between the two power parts, the front end part of the modularized tool holder 3 is provided with a limiting part 20 which is abutted against the corresponding end surface of the tool head 2 so as to realize axial limiting on the modularized tool holder 3, a modularized tool holder screw hole 21 is arranged in the limiting part 20, a tool head screw hole 22 is arranged at the position corresponding to the modularized tool holder screw hole 21 on the tool head 2, a fastening bolt sleeve member 5 is used for connecting the modularized tool head screw hole 21 with the tool head screw hole 22, and an adjusting gasket 23 fixed by the fastening bolt sleeve member 5 is also arranged between the tool head 2 and the modularized tool holder 3, the spacer shims 23 are provided with different thicknesses for fine adjustment of the axial position of the tool holder to achieve precise positioning of the milling profile.

Through the fixed meeting of corresponding forked tail tenon structure 17 and dovetail, make blade disc 2 and modularization cutter holder 3 adopt simple and practical's connected mode to reach the fixed effect of most efficient, have that positioning accuracy is high, be convenient for dismouting and maintenance and mill the convenient advantage of calibration of profile.

In a detailed description, in order to improve the connection stability of the blade 4, a hollow threaded sleeve 24 for the fastening screw 6 to extend into the blade 4 for connection is arranged, the fastening screw 6 is inserted into the hollow threaded sleeve 24 to be matched and fixed, a cutting pad 25 is arranged at the joint of the blade 4 and the modular tool holder 3, the inner end of the hollow threaded sleeve 24 extends into the cutting pad 25 to enable the cutting pad 25 to be fixed on the hollow threaded sleeve 24, the hollow threaded sleeve 24 is used for fixing the cutting pad 25, the purpose of independently increasing the fixing gaskets of the hollow threaded sleeve 24 is to enable the cutter head 2 to be in a vertical state when the blade 4 is assembled and disassembled in situ, and after the fastening screw 6 of the blade 4 is disassembled, the cutting pad 25 is prevented from sliding down.

In further detail, the shim 25 is made of coarse-grain hard alloy, has high hardness and impact resistance, can protect the modular tool holder 3, reduces vibration, achieves different thicknesses through fine grinding of the shim 25, guarantees small tolerance sizes and high flatness, and can compensate contour distortion caused by thickness difference of the blade 4 through the shim 25 with different thicknesses, so that assembly accuracy is guaranteed.

In one embodiment, to meet the requirements of different railway profile rail types, the following method can be used for realizing the following steps:

1. the modular tool holders 3 of different specifications are replaced, four profiles are corresponding to the modular tool holders 3 of four different specifications, and only the modular tool holders 3 need to be replaced.

In the second embodiment, in order to meet the requirements of different railway profile rail types, the following steps can be implemented:

1. the modular tool holders 3 with different specifications are replaced, four sets of the modular tool holders 3 with different specifications correspond to four profiles, and only the modular tool holders 3 need to be replaced;

2. the use of the same modular tool holder 3 is achieved by varying the thickness of the shim 25 and designing the inserts 4 to correspond to four sets of profiles.

The on-line repairing milling cutter can meet the requirements of repairing different rail types, and the specific rail type is shown in figure 10.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a railway track restores milling cutter on line, its characterized in that includes blade disc (2) and a plurality of modularization cutter holder (3) along blade disc (2) outer wall circumference distribution, modularization cutter holder (3) on can dismantle and be connected with a plurality of and be used for to disease track (1) prosthetic blade (4), a plurality of modularization cutter holder (3) are connected on the perisporium of blade disc (2) through fastening bolt external member (5), have the clearance between two adjacent modularization cutter holder (3).

2. The railway track on-line reconditioning milling cutter according to claim 1, wherein said insert (4) is mounted on a modular toolholder (3) by means of a fastening screw (6).

3. The milling cutter for the on-line restoration of railway tracks according to claim 1, characterized in that said blades (4) are square.

4. The milling cutter for on-line restoration of railway tracks according to claim 3, wherein said blade (4) has four arc-shaped surfaces (7) with axial symmetry, and said arc-shaped surfaces (7) have four arc-shaped cutting edges (7 a) in total.

5. A railway track on-line restoration milling cutter according to claim 3, characterized in that the blade (4) has four straight cutting edges (8).

6. The milling cutter for on-line restoration of railway rails according to claim 3, wherein the blade (4) has four curved arc surfaces (9) formed along the circumferential direction of the blade surface, and the total of the four curved arc surfaces (9) has four cutting edges (9 a) each formed by a straight cutting edge (8) and an arc cutting edge (7 a).

7. The milling cutter for on-line restoration of a railway track according to claim 1, wherein a limiting step ring (10) for installing a plurality of modular tool holders (3) and axially limiting each modular tool holder (3) is arranged on the peripheral wall of the cutter head (2), a limiting groove (11) for being clamped with the limiting step ring (10) to form axial limiting is formed in the inner peripheral wall of each modular tool holder (3), a plurality of radial limiting grooves I (12 a) distributed at intervals along the circumferential direction of each limiting step ring (10) are formed in each limiting step ring (10), radial limiting grooves II (12 b) are formed in positions, corresponding to the radial limiting grooves I (12 a), on the groove wall of each limiting groove I (11) of each modular tool holder (3), and the corresponding radial limiting grooves I (12 a) and the radial limiting grooves II (12 b) are combined and communicated to form a radial limiting groove body (12), radial spacing cell body (12) in all fixedly be provided with and be used for carrying out radial spacing power spare (13) to corresponding modularization cutter holder (3), power spare (13) be located in radial spacing cell body (12) through locking bolt (14), the position department of the corresponding each modularization cutter holder (3) of outward flange of blade disc (2) all inclines to set up a plurality of and has through-hole (15), each the screw (16) of a plurality of and corresponding through-hole (15) intercommunication are all inclined to set up on modularization cutter holder (3) inner wall, fastening bolt external member (5) stretch into in through-hole (15) and corresponding screw (16) threaded connection.

8. The milling cutter for on-line restoration of railway tracks according to claim 1, characterized in that the angle γ ° between the central axis of the fastening bolt kit (5) and the longitudinal section line of the cutter head (2) is provided.

9. The milling cutter is repaired on line to railway track according to claim 1, characterized in that, the inner end of the modularized cutter holder (3) is a dovetail structure (17), two cutter holder dovetail grooves (18) for installing the cutter head (2) are formed between the modularized cutter holder (3), a plurality of power parts fixedly connected with the corresponding cutter holder dovetail grooves (18) are arranged on the circumferential wall of the cutter head (2), the power parts are also dovetail structures (17), two cutter head dovetail grooves (2) for fixedly connecting the inner end of the modularized cutter holder (3) are arranged between the power parts, the front end of the modularized cutter holder (3) is provided with a limiting part (20) which is abutted against the corresponding end surface of the cutter head (2) so as to realize axial limiting to the modularized cutter holder (3), and a cutter holder screw hole (21) is arranged in the limiting part (20), cutter head (2) on correspond the position department of cutter holder screw (21) and seted up cutter head screw (22), fastening bolt external member (5) be connected cutter holder screw (21) with cutter head screw (22), cutter head (2) and modularization cutter holder (3) between still be provided with by the fixed adjusting shim (23) of fastening bolt external member (5), blade (4) in have and supply fastening screw (6) to stretch into hollow thread bush (24) of connection, the junction of blade (4) and modularization cutter holder (3) be provided with cutting pad (25), hollow thread bush (24) inner stretch into in cutting pad (25) make this cutting pad (25) be fixed in on hollow thread bush (24).

10. The milling cutter for on-line restoration of railway tracks according to claim 9, characterized in that the shim (25) is made of coarse grain cemented carbide.