ALL-ELECTRIC FIXED UNDERFLOOR WHEEL SETS LATHE

Disclosed is an all-electric fixed underfloor wheel sets lathe, comprising: a frame, two rails provided on the frame, two lathe tools provided on the frame and two sets of wheel driving devices provided on the frame, wherein each set of the wheel driving devices comprises leveling brackets, drive assemblies provided on the leveling brackets, lifting assemblies provided on the leveling brackets and leveling assemblies provided on the leveling brackets, the lifting assemblies and the leveling assemblies are fixedly connected to the frame, the drive assemblies are configured for driving wheels to rotate and the lifting assemblies are configured for lifting the leveling brackets.

TECHNICAL FIELD

The present application relates to the technical field of wheel repair apparatus, more particularly to an all-electric fixed underfloor wheel sets lathe.

BACKGROUND ART

An underfloor wheel sets lathe is an apparatus mainly used for repairing rims and treads of various rail vehicle wheels.

In the related art, for example, Chinese invention patent publication No. CN 107344244A discloses a friction pulley floating drive device of a numerically controlled underfloor wheel sets lathe comprising a base, a drive mechanism and a hydraulic mechanism, wherein the drive mechanism is provided on the base, and the hydraulic mechanism is connected to the drive mechanism via a pipeline. The drive mechanism comprises a friction pulley box body, an electric motor, a coupling, an electric motor main shaft, friction driving pulleys, and a hydraulic oil cylinder, wherein the hydraulic oil cylinder and the friction pulley box body are both provided on the base, the hydraulic oil cylinder is connected to the friction pulley box body via a piston rod, the electric motor is provided on the friction pulley box body, the electric motor is connected to the electric motor main shaft via the coupling, the electric motor main shaft is provided in the friction pulley box body, and the friction driving pulleys are provided at the end of the electric motor main shaft.

When using the above-mentioned floating drive device for friction pulleys of a numerically controlled underfloor wheel sets lathe, the floating drive device for the friction pulley of the numerically controlled underfloor wheel sets lathe is mounted on a frame of the numerically controlled underfloor wheel sets lathe, wheels are placed on the frame and located directly above friction driving pulleys, a hydraulic oil cylinder is started, the hydraulic oil cylinder drives a friction pulley box body which then drives the friction driving pulleys to rotate, and the friction driving pulleys gradually abut against the bottom of the wheels and lifts the wheel, so that the wheels are separated from a rail. The motor is started to drive the friction driving pulleys to rotate, and the friction driving pulleys drive the wheels to rotate.

With regard to the above-mentioned related art, the inventor believes that after the friction driving pulleys lift the wheel, a central axis of the friction driving pulleys are provided at an angle to a central axis of the wheel, and then the contact area between the friction driving pulleys and the wheels is reduced, so that the wear of the friction driving pulleys on the wheels are greater, and there is a defect that the friction driving pulleys become a burden for the repair of the wheel.

SUMMARY

In order to alleviate the problem of the burden of repairing the wheels caused by the friction driving pulleys, the present application provides an all-electric fixed underfloor wheel sets lathe.

The present application provides an all-electric fixed underfloor wheel sets lathe using the following technical solution: an all-electric fixed underfloor wheel sets lathe comprising a frame, two rails provided on the frame, two lathe tools provided on the frame and two sets of wheel driving devices provided on the frame, wherein each set of the wheel driving devices comprises leveling brackets, drive assemblies provided on the leveling brackets, lifting assemblies provided on the leveling brackets and leveling assemblies provided on the leveling brackets, the lifting assemblies and the leveling assemblies are fixedly connected to the frame, the drive assemblies are configured for driving wheels to rotate and the lifting assemblies are configured for lifting the leveling brackets.

By using the above-mentioned technical solution, when repairing a wheel, the wheel is driven onto a rail, and then a lifting assembly is operated to lift a leveling bracket which drives the drive assembly to move; the drive assembly moves in a direction close to the wheel; the drive assembly gradually abuts the bottom of the wheel and lifts the wheel, and then the wheel is gradually separated from the rail; after the wheel is separated from the rail, the leveling assembly is operated to drive the leveling bracket which is gradually in a horizontal state, then the drive structure is operated to enable the drive structure to drive the wheel to rotate, then the lathe tool is operated to repair the wheel.

A rotation axis of the drive assembly and a rotation axis of the wheel are in a parallel state by adjusting the leveling bracket to a horizontal state, thereby reducing the occurrence of an included angle between the rotation axis of the drive assembly and the rotation axis of the wheel that will affect the contact area between the drive assembly and the wheel, reducing the occurrence of wear on the wheel by the drive assembly, and further reducing the occurrence of a burden on the wheel repair by the drive assembly; at the same time, the leveling assembly can be configured for adjusting the height of the outer side of the leveling bracket, i.e., adjusting the height of one end of the leveling bracket away from the wheel, so that the height of the outer side of the leveling bracket of the two sets of wheel driving devices respectively located at two sides of the rail is consistent, reducing the occurrence of the symmetry decrease of the wheel treads at the two sides after repair, thereby improving the accuracy of wheel tread repair.

Alternatively, the lifting assembly comprises a lifting frame and a drive structure for driving the lifting frame, the drive structure is fixedly connected to the frame, and the lifting frame is hinged to the leveling bracket.

By using the above-mentioned technical solution, when the wheels are lifted and separated from the rail, the drive structure is operated to lift the lifting frame, the lifting frame drives the leveling bracket to move the drive assembly, and the drive assembly drives the wheels to rise, and then the wheels are separated from the rail, i.e., to lift the wheel.

Alternatively, the drive structure comprises a fixed housing, a drive rod having one end slidably connected in a fixed housing, a first ball screw rotatable in the fixed housing and a servo motor fixedly connected to the fixed housing, wherein the servo motor is in transmission connection with a screw of the first ball screw, a nut of the first ball screw is fixedly connected to the drive rod, the drive rod is fixedly connected to the lifting frame, and the fixed housing is fixedly connected to the frame.

By using the above-mentioned technical solution, when driving the lifting frame, a servo motor is started, the servo motor drives the screw of the first ball screw to rotate, a nut of the first ball screw rotates relative to the screw and moves along the length direction of the screw, the nut drives the drive rod to move, the drive rod slides relative to the fixed housing, and the drive rod drives the lifting frame while moving, i.e., the lifting frame is driven.

Alternatively, the all-electric fixed underfloor wheel sets lathe further comprises a pressure sensor by which the drive rod is fixedly connected to the lifting frame.

By using the above-mentioned technical solution, when the drive rod drives the lifting frame, the lifting frame drives the leveling bracket to move the drive assembly, and the drive assembly gradually abuts against the bottom of the wheel, so that the pressure received by the pressure sensor gradually increases, and when the pressure received by the pressure sensor does not change any more, the driving of the lifting frame is discontinued, thereby achieving the effect of facilitating the staff to control the lifting height of the lifting frame.

Alternatively, the leveling assembly comprises a leveling housing, a leveling rod having one end slidably connected in the leveling housing, a second ball screw rotatably connected in the leveling housing and a hand-held rod fixedly connected to the second ball screw, wherein a nut of the second ball screw is fixedly connected to the leveling rod which is hinged to the leveling bracket, and the leveling housing is fixedly connected to the frame.

By using the above-mentioned technical solution, after the wheels are lifted by adjusting the lifting assembly, a hand-held rod is rotated to rotate the screw rod of the second ball screw; the nut of the second ball screw rotates relative to the screw rod, the nut moves along a length direction of the screw rod and drives the leveling rod to move; the leveling rod and the leveling bracket rotate relative to each other, and then the leveling bracket is gradually in a horizontal state, thereby ensuring the contact area between the drive assembly and the wheels as far as possible, reducing the wear on the wheels by the drive assembly, and further reducing the burden on the wheel repair caused by the drive assembly.

Alternatively, the apparatus further comprises a wheel axial limiting device provided in two sets which respectively abut against the inner sides of two wheels, and the wheel axial limiting devices are both configured for limiting the wheels in an axial direction of the wheels.

By using the above-mentioned technical solution, when the drive assembly drives the wheels, the wheel axial limiting devices limit the axial movement of the wheels, thereby reducing the occurrence of the wheels moving along their own axial direction during the rotation process, on the one hand, increasing the stability of the wheels when the all-electric fixed underfloor wheel sets lathe repairs the wheels, and on the other hand, improving the efficiency of the all-electric fixed underfloor wheel sets lathe in repairing the wheels.

Alternatively, each set of the wheel axial limiting devices comprises device bodies, limiting rods having one end slidably connected in the device bodies, limiting pulleys rotatably connected to the limiting rods, and pushing assemblies for pushing the limiting rods to slide, wherein the limiting pulleys are provided with limiting grooves abutting against the rims of the wheels, and the device bodies are fixedly connected to the frame.

By using the above-mentioned technical solution, after the wheels are separated from the rail, the pushing assembly is operated to push the limiting rod which drives the limiting pulley to move, and then the limiting pulley moves towards the direction close to the wheel, so that the limiting groove on the limiting pulley abuts against the rim of the wheel, and when the wheels rotate, the limiting pulley and the wheel rotate relative to each other, thereby achieving the effect of axially limiting the wheel.

Alternatively, the pushing assembly comprises a third ball screw and a first drive motor, wherein the first drive motor is in transmission connection with a screw of the third ball screw, a nut of the third ball screw is fixedly connected to the limiting rod, and the first drive motor is fixedly connected to the device body.

By using the above-mentioned technical solution, when the limiting rod is driven, the first drive motor is started to drive the first drive motor drives the screw of the third ball screw to rotate, the nut of the first ball screw and the screw rotate relative to each other, the nut moves along the length direction of the screw, and the nut drives the limiting rod to move, i.e., the limiting rod is driven.

Alternatively, an outer sleeve of the limiting rod is provided with a guide sleeve having one end slidably connected to the device body, and the guide sleeve moves with the movement of the limiting rod.

By using the above-mentioned technical solution, when the limiting rod moves, the limiting rod drives the guide sleeve to move, and the guide sleeve slides relative to the device body; and by providing the guide sleeve on the outside of the limiting rod, the maximum lateral pressure that the limiting rod can bear can be increased, and the occurrence of bending deformation of the limiting rod can be reduced, thereby increasing the stability of the limiting pulley.

Alternatively, the device body is provided with a limiting block for limiting the movement of the guide sleeve, a rotation seat is hinged on the limiting rod, the limiting pulley is rotatably connected to the rotation seat having one end near the limiting pulley hinged to the guide sleeve.

By using the above-mentioned technical solution, when the limiting rod moves, the guide sleeve moves with the movement of the limiting rod; when the guide sleeve moves to the limit position, the limiting block limits the movement of the guide sleeve; the guide sleeve cannot continue to move; the limiting rod continues to move; the limiting rod drives the rotation seat, and the rotation seat and the guide sleeve rotate relative to each other, so that the central axis of the limiting pulley gradually forms an included angle with the central axis of the wheel, thereby increasing the axial pressure exerted by the limiting pulley on the wheel, thereby increasing the axial limiting effect of the limiting pulley on the wheel.

In summary, the present application comprises at least one of the following beneficial technical effects: by providing a leveling bracket, a drive assembly, a lifting assembly and a leveling assembly, after placing wheels on a rail, the lifting assembly lifts the leveling bracket, the leveling bracket drives the drive assembly to move, the drive assembly gradually abuts against the bottom of the wheels and lifts the wheels, and after the wheels are separated from the rail, the leveling assembly is operated to adjust the leveling bracket, so that the leveling bracket is in a horizontal state, thereby reducing the formation of an included angle between the central axis of the drive assembly and the central axis of the wheel, resulting in serious wear on the wheel, and further reducing the burden caused by wheel repair; the leveling assembly can be configured for adjusting the height of the outer side of the leveling bracket, i.e., adjusting the height of one end of the leveling bracket away from the wheel, so that the heights of the outer sides of the leveling brackets of the two sets of wheel driving devices respectively located at two sides of the rail are consistent, reducing the occurrence of the symmetry decrease of the wheel treads at the two sides after repair, and further improving the accuracy of wheel tread repair; by providing a lifting frame and a drive structure, the drive structure is configured for driving the lifting frame, and when the leveling bracket is lifted, the drive structure is started, the drive structure drives the lifting frame, and the lifting frame drives the leveling bracket, i.e., the leveling bracket is lifted; by providing a fixed housing, a drive rod, a first ball screw and a servo motor, when driving the lifting frame, the servo motor is started to drive the first ball screw which drives the drive rod, and the drive rod drives the lifting frame, then enabling the lifting frame to lift the leveling bracket to lift the leveling bracket.

DETAILED DESCRIPTION

This application is described in further detail below with reference toFIGS.1-6.

The embodiments of the present application disclose an all-electric fixed underfloor wheel sets lathe.

Referring toFIGS.1and2, an all-electric fixed underfloor wheel sets lathe comprises a frame100, two rails200, two lathe tools300, two sets of wheel driving devices400, wherein the two rails200are provided in parallel and spaced apart. A rail200, a lathe tool300and a set of wheel driving devices400are provided on one side of the frame100, and another rail200, another lathe tool300and another set of wheel driving devices400are provided on the other side of the frame100. When repairing a wheel800, it is driven onto the rail200and moved to the top of the wheel driving device400which lifts the wheel800and then separates the wheel800from the rail200, and then the wheel driving device400drives the wheel800to rotate, and the lathe tool300repairs the wheel800, i.e. the effect of repairing the wheel800is achieved.

Referring toFIGS.1and3, in order to lift the wheels800and drive the wheels800to rotate, the wheel driving device400includes a leveling bracket410, a drive assembly420provided on the leveling bracket410, and a lifting assembly430provided at one end of the bottom of the leveling bracket410. The lifting assembly430is an all-electric cushioning type assembly. The lifting assembly430is used to lift one end of the leveling bracket410, and the drive assembly420is configured for driving the wheel800lifted to rotate, i.e., the wheel800is lifted and rotated.

After lifting the leveling bracket410by the lifting assembly430, an included angle is formed between the leveling bracket410and the central axis of the wheel800, so that the contact surface between the drive assembly420and the wheel800is smaller, so that the pressure at the contact position between the drive assembly420and the wheel800is greater, thereby resulting in more wear of the wheel800by the drive assembly420, and finally causing a burden on the repair of the wheel800.

Referring toFIGS.1and3, in order to reduce the occurrence of severe wear of the drive assembly420on the wheel800, resulting in a burden on the repair of the wheel800, the wheel driving device400further comprises a leveling assembly440provided at the bottom of the leveling bracket410and located at an end of the leveling bracket410away from the lifting assembly430. After lifting the wheel800, the leveling assembly440is operated to drive the leveling bracket410which is gradually in a horizontal state, and then the central axis of the drive assembly420is set to be collinear with the central axis of the wheel800as far as possible to reduce the occurrence of forming an included angle between the central axis of the drive assembly420and the central axis of the wheel800, thereby reducing the occurrence of heavy wear of the wheel800by the drive assembly420and causing a burden on the repair of the wheel800.

Referring toFIGS.1and4, in order to lift the leveling bracket410, the lifting assembly430comprises a lifting frame431and a drive structure432, wherein the lifting frame431is U-shaped, an opening of the lifting frame431faces a leveling bracket410, and the lifting frame431is hinged to the bottom of the leveling bracket410, and the drive structure432is fixedly connected to the frame100. When the leveling bracket410is lifted, the drive structure432is operated to drive the lifting frame431to lift the leveling bracket410, and the lifting frame431and the leveling bracket410rotate relative to each other, i.e., the leveling bracket410is lifted.

Referring toFIGS.1and4, in order to drive the lifting frame431, the drive structure432includes a fixed housing433, a drive rod434provided for a pipe body and having one end slidably coupled in the fixed housing433, a first ball screw435, and a servo motor436. The first ball screw435is rotatably connected in the fixed housing433, the first ball screw435is provided parallel to the drive rod434, the nut of the first ball screw435is fixedly connected to the drive rod434, and the screw of the first ball screw435is in a drive connection to the output shaft of the servo motor436. The servo motor436is fixedly connected to a fixed housing433which is fixedly connected to a frame100. The drive rod434is located at the bottom of the lifting frame431and is fixedly connected to the bottom of the lifting frame431. When the lifting frame431is driven, the servo motor436is started to drive the screw of the first ball screw435to rotate; the screw of the first ball screw435and the nut rotate relative to each other; the nut moves along the length direction of the screw; and at the same time, the nut drives the drive rod434to move, i.e., the lifting frame431is driven.

Referring toFIGS.1and4, in order to facilitate a worker in determining the height at which a wheel800is lifted, the drive rod434is fixedly connected to the lifting frame431through a pressure sensor437which is fixedly connected to the bottom of the lifting frame431and fixedly connected to the top of the drive rod434. When a wheel800is lifted, the drive assembly420gradually abuts against the wheel800, and as the height of the wheel800being lifted increases, the pressure experienced by the pressure sensor437increases. When the pressure experienced by the pressure sensor437no longer changes, the lifting of the wheel800is discontinued, indicating that the wheel800has disengaged from the rail200, thereby facilitating a worker to determine a height at which the wheel800has been lifted.

With reference toFIGS.1and4, in order to increase the stability when the lifting frame431and the leveling bracket410rotate relative to each other, one end of the lifting frame431away from the drive rod434is provided in a hemispherical shape, the bottom of the leveling bracket410is provided with a hemispherical groove411corresponding to the lifting frame431, and one end of the lifting frame431in a hemispherical shape is inserted into the hemispherical groove411. When the lifting frame431drives the leveling bracket410, one end of the lifting frame431in a hemispherical shape rotates in the hemispherical groove411, thereby reducing the occurrence of separation between the lifting frame431and the leveling bracket410, and further increasing the stability when the lifting frame431and the leveling bracket410rotate relative to each other.

Referring toFIGS.1and5, in order to level the leveling bracket410, the leveling assembly440comprises a leveling housing441, a leveling rod442, a second ball screw443and a hand-held rod444, wherein one end of the leveling rod442is provided with a receiving cavity445, and one end of the leveling rod442provided with the receiving cavity445is slidably connected in the leveling housing441. One end of the second ball screw443is rotatably connected in the leveling housing441, one end of the screw of the second ball screw443is inserted into the receiving cavity445, and the nut of the second ball screw443is fixedly connected to the cavity port in the receiving cavity445. The hand-held rod444is vertically fixedly connected to an end of the screw of the second ball screw443outside the leveling housing441. The leveling housing441is fixedly connected to the frame100, and the leveling rod442is hinged to an end of the leveling bracket410away from the lifting frame431.

When the leveling bracket410is leveled, the hand-held rod444is rotated; the hand-held rod444drives the screw of the second ball screw443to rotate; the screw of the second ball screw443and the nut rotate relatively; the nut moves along the length direction of the screw; at the same time, the nut drives the leveling rod442; the leveling rod442drives the leveling bracket410; and the leveling bracket410and the leveling rod442rotate relatively, so that the leveling bracket410is gradually in a horizontal state, thereby achieving the effect of leveling the leveling bracket410.

During rotation of a wheel800by the drive assembly420, the wheel800may move in its own axial direction, which in turn makes repair of the wheel800by the lathe tool300less efficient.

Referring toFIGS.1and6, in order to reduce the movement of a wheel800in its own axial direction and improve the repair efficiency of the lathe tool300to the wheel800, the all-electric fixed underfloor wheel sets lathe further comprises a wheel axial limiting device500provided in two sets, including one set of the wheel axial limiting devices500provided on one side of the frame100, and the other set of the wheel axial limiting devices500provided on the other side of the frame100. When the wheel800is axially limited, the two sets of wheel axial limiting devices500respectively interfere with the inner sides of the two wheels800, and the two sets of wheel axial limiting devices500are both configured for axially limiting the wheel800to reduce the movement of the wheel800in the axial direction thereof when the wheel800rotates, thereby increasing the stability of the wheel800when it rotates, thereby improving the repair efficiency of the lathe tool300for the wheel800.

Referring toFIGS.1and6, in order to achieve axial limiting of a wheel800, each set of wheel axial limiting devices500comprises a device body510, a limiting rod520, a limiting pulley530and a pushing assembly540, wherein the limiting pulley530is provided with a limiting groove531provided along the circumferential direction of the limiting pulley530. A limiting pulley530is provided at one end of the limiting rod520, and the limiting pulley530is rotatably connected to the limiting rod520. An end of the limiting rod520away from the limiting pulley530is slidably connected in the device body510, and the pushing assembly540is provided on the device body510, and the device body510is fixedly connected to the frame100. After a wheel800is separated from the rail200, the pushing assembly540is operated to drive the limiting rod520which drives the limiting pulley530to move, the limiting pulley530moves in a direction close to the wheel800, and then the limiting pulley530gradually abuts against the wheel800, and the limiting groove531abuts against the rim of the wheel800. When the drive assembly420drives the wheel800to rotate, the limiting pulley530rotates with the rotation of the wheel800, and the two limiting pulleys530respectively apply forces in opposite directions to the two wheels800, i.e. the two wheels800are axially limited.

Referring toFIGS.1and6, in order to push the limiting rod520, the pushing assembly540includes a third ball screw541and a first drive motor542, and an output shaft of the first drive motor542is fixedly connected coaxially with a screw of the third ball screw541. The third ball screw541is located in the device body510, the screw of the third ball screw541is provided coaxially with the limiting rod520, one end of the limiting rod520located in the device body510is provided with a placing cavity521accommodating the third ball screw541, one end of the screw of the third ball screw541penetrates into the placing cavity521, and a nut of the third ball screw541is fixedly connected to a cavity port of the placing cavity521. The first drive motor542is fixedly connected to the device body510which is fixedly connected to the frame100. When the limiting rod520is pushed, the first drive motor542is started to drive the screw rod of the third ball screw541to rotate; the screw rod of the third ball screw541and the nut rotate relative to each other; the nut moves along the length direction of the screw rod; and the nut drives the limiting rod520to move, i.e., the limiting rod520is pushed.

When the limiting pulley530limits a wheel800, the wheel800applies a force perpendicular to the length direction of the limiting rod520to the limiting pulley530, which causes the limiting rod520to bend. In order to reduce the occurrence of easy bending of the limiting rod520, an outer sleeve of the limiting rod520is provided with a guide sleeve600having one end inserted into the device body510and slidably coupled with the device body510. When the pushing assembly540drives the limiting rod520, the limiting rod520slides relative to the device body510, and the guide sleeve600moves with the movement of the limiting rod520, so that the guide sleeve600enhances the strength of the limiting rod520, thereby increasing the maximum lateral pressure that the limiting rod520can bear, thereby reducing the occurrence of bending the limiting rod520.

Referring toFIGS.1and6, in order to achieve that the guide sleeve600moves with the movement of the limiting rod520, the diameter of the limiting rod520near the end of the limiting pulley530is smaller than that of the limiting rod520away from the end of the limiting pulley530. An aperture of a central hole of the guide sleeve600near the end of the limiting pulley530is smaller than that of the central hole of the guide sleeve600away from the end of the limiting pulley530. A spring522is sleeved on the limiting rod520, one end of the spring522abuts against an end of a thicker end of the limiting rod520, and the other end of the spring522abuts against an end wall of the thicker end of the central hole of the guide sleeve600. When the limiting rod520moves, the limiting rod520drives the spring522to move, so that the guide sleeve600moves with the movement of the limiting rod520under the action of the spring522, i.e., the guide sleeve600moves with the movement of the limiting rod520.

Referring toFIGS.1and6, in order to increase the effect of axially limiting a wheel800by a wheel axial limiting device500, a circumferential side surface of the guide sleeve600is provided with a waist-shaped limiting groove523, the length direction of which is parallel to the axial direction of the guide sleeve600. A limiting block511is fixedly connected to the device body510, one end of the limiting block511is inserted into the device body510, and the other end of the limiting block511is located in the waist-shaped limiting groove523. The limiting pulley530is rotatably connected to the limiting rod520via a rotation seat700; the limiting pulley530is rotatably connected to the rotation seat700which is hinged to the limiting rod520; and one end of the rotation seat700near the limiting pulley530is hinged to the guide sleeve600.

When the limiting rod520moves, the guide sleeve600moves with the movement of the limiting rod520, and the limiting block511slides relative to the waist-shaped limiting groove523. When the limiting block511abuts against an end wall of the waist-shaped limiting groove523, the guide sleeve600stops moving, the limiting rod520continues moving, the limiting rod520compresses the spring522, the limiting rod520drives the rotation seat700, the rotation seat700and the guide sleeve600rotate relative to each other, and the rotation seat700drives the limiting pulley530to rotate until the limiting groove531abuts against the rims of the wheels800. At this moment, an included angle is formed between the rotation axis of the limiting pulley530and the rotation axis of the wheel800, and this state can increase the limiting effect of the limiting pulley530on the axial direction of the wheel800.

Referring toFIGS.1and3, finally, in order to drive the wheels800, the drive assembly420includes two friction driving pulleys421and two second drive motors422, and one second drive motor422is provided corresponding to one friction driving pulley421. Each second drive motor422is in a drive connection to a corresponding friction driving pulley421. The friction driving pulleys421on the two sets of drive assemblies420are oppositely provided. The friction driving pulleys421are rotatably connected to the leveling bracket410, and the second drive motor422is fixedly connected to the leveling bracket410. After the wheels800move onto the rail200, they are positioned on top between two friction driving pulleys421on the same set of drive assemblies420. When driving the wheels800, the friction driving pulleys421abut against the wheels800, the second drive motor422drives the friction driving pulleys421which drive the wheels800, i.e., the wheels800are driven.

The implementation principle of an all-electric fixed underfloor wheel sets lathe of the embodiments of the present application is as follows: when repairing the wheels800using the all-electric fixed underfloor wheel sets lathe, the wheels800are first moved onto the rail200of the all-electric fixed underfloor wheel sets lathe. A servo motor436is then started, which in turn causes the drive rod434to drive the lifting frame431which rotates relative to the leveling bracket410and leveling bracket410is lifted, the friction driving pulleys421abut against the wheels800and lift the lifting wheels800off from the rail200.

The hand-held rod444is rotated, so that the leveling rod442drives the leveling bracket410, and the leveling bracket410is gradually in a horizontal state to ensure the contact area between the friction driving pulleys421and the wheels800as far as possible, and reducing the occurrence of additional wear on the wheels800due to the smaller contact area between the friction driving pulleys421and the wheels800.

Then, the first drive motor542is started again, so that the limiting rods520drive the limiting pulleys530toward the wheels800, and finally the limiting groove531abuts against rims of the wheels800. Finally, the second drive motor422is started to drive the friction driving pulleys421to drive the wheels800to rotate, and the lathe tool300repairs the wheels800.

The above-mentioned preferred embodiments of the present application do not limit the scope of protection of the present application, and therefore: all changes which come within the meaning and range of equivalence of the claims are to be embraced within their scope.