CN217453397U

CN217453397U - Small-size rail welding seam polisher

Info

Publication number: CN217453397U
Application number: CN202220040277.7U
Authority: CN
Inventors: 高春雷; 王鹏; 张世红; 王金栋; 何国华; 程锋; 张锐; 徐济松; 唐建江; 宋立君; 周佳亮; 吴和山; 宋晓阳; 刘传; 刘尚昆; 何喆
Original assignee: Beijing Tieke Prasai Road Maintenance Machinery Co ltd; China Academy of Railway Sciences Corp Ltd CARS; Railway Engineering Research Institute of CARS
Current assignee: Beijing Tieke Prasai Road Maintenance Machinery Co ltd; China Academy of Railway Sciences Corp Ltd CARS; Railway Engineering Research Institute of CARS
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-09-20
Anticipated expiration: 2032-01-10

Abstract

The utility model relates to a railway line maintenance of equipment especially relates to a small-size rail welding seam polisher. The utility model provides a small-size rail welding seam polisher, includes abrasive band polisher, preceding swing arm, goes up swing arm, card rail mechanism, it is articulated with card rail mechanism to go up swing arm one end, and the other end is articulated with preceding swing arm, preceding swing arm one end is articulated with last swing arm, and the other end is connected with the abrasive band polisher, card rail mechanism including switching-over seat, sliding seat, rail cramping apparatus, it is articulated and use swing arm knob plunger locking angle position through the round pin axle of horizontal direction to go up swing arm one end and switching-over seat, switching-over seat and sliding seat are articulated through the steering pin of vertical direction and use switching-over knob plunger locking angle position. The utility model discloses it is very convenient when the rail another side of rail is polished to the conversion direction after the rail one side has been polished to can polish to the butt weld chamfer.

Description

Small-size rail welding seam polisher

Technical Field

The utility model relates to a railway line maintenance of equipment especially relates to a small-size rail welding seam polisher.

Background

Patent document CN111172829A discloses a grinding device for steel rail welding seam abrasive belt, which comprises a grinding mechanism, a position adjusting mechanism and a rail clamping mechanism, the device is convenient to disassemble and assemble, the grinding angle and range can be freely adjusted, and the device is convenient to carry. However, after one side of the steel rail is polished, the device needs to be detached from the steel rail to turn the direction, so that the other side of the steel rail can be polished, and the operation is inconvenient. In addition, the device can only polish the surface of the steel rail parallel to the longitudinal direction of the steel rail, and can not polish the weld chamfer forming an angle with the longitudinal direction of the steel rail.

Disclosure of Invention

The utility model discloses be exactly to transfer the technical defect that the direction is inconvenient, can not polish the welding seam chamfer when polishing the rail both sides among the prior art, provide an operation more convenient and can polish the small-size rail welding seam polisher of welding seam chamfer.

The utility model discloses a realize through following technical scheme:

the utility model provides a small-size rail welding seam polisher, includes abrasive band polisher, preceding swing arm, goes up swing arm, card rail mechanism, it is articulated with card rail mechanism to go up swing arm one end, and the other end is articulated with preceding swing arm, preceding swing arm one end is articulated with last swing arm, and the other end is connected with the abrasive band polisher, and the abrasive band polisher includes power wheel assembly, elastic support mechanism, working wheel assembly, abrasive band, gyro wheel positioning mechanism, and the abrasive band suit is on power wheel assembly and working wheel assembly, and power wheel assembly and working wheel assembly are by the tensioning of elastic support mechanism.

Preferably, the elastic support mechanism comprises an elastic support seat, a guide rod, an auxiliary guide rod, a tensioning spring, a tensioning nut and a quick telescopic mechanism, the guide rod and the auxiliary guide rod are parallel to each other, fixedly connected with the elastic support seat and slidably connected with the power wheel assembly, and the tensioning spring is positioned between the elastic support seat and the power wheel assembly and sleeved on the guide rod

Preferably, the rail clamping mechanism comprises a reversing seat, a sliding seat and a rail clamping device, the rail clamping device is connected with the sliding seat through two linear bearings and locked by a handle, one end of the upper swing arm is hinged with the reversing seat through a pin shaft in the horizontal direction, the reversing seat is hinged with the sliding seat through a pin shaft in the vertical direction, the sliding seat is respectively provided with 3 positioning holes on two sides of the pin shaft in the vertical direction, and the reversing seat is provided with a reversing knob plunger which can be inserted into the positioning holes to lock the position beside the pin shaft in the vertical direction.

Preferably, still include the gyro wheel positioning mechanism with elastic support mechanism fixed connection, positioning mechanism includes positioning seat, upset arm, locating wheel, round pin locking mechanism, bulb plunger, the upset arm install in the positioning seat draw-in groove, the locating wheel is installed at the front end of upset arm, upset arm rear end and positioning seat articulated, positioning seat articulated shaft front mounted have round pin locking mechanism, the bulb plunger is installed at the articulated shaft back, upset arm articulated shaft both sides correspond the locking hole that is equipped with round pin locking mechanism and bulb plunger respectively.

Preferably, the elastic support seat is provided with a quick telescopic mechanism at one end of the working wheel assembly, the quick telescopic mechanism comprises a tensioning handle, a tensioning connecting rod, an extension rod, a locking wrench and an elastic pin, the extension rod is connected with the elastic support seat in a sliding manner, the extension rod is fixedly connected with the working wheel assembly, the middle of the elastic support seat is provided with a groove, the tensioning handle is hinged in the groove, and the tensioning connecting rod is respectively hinged with the extension rod and the tensioning handle. The elastic supporting seat is provided with a locking wrench for locking the tensioning handle. An elastic pin is fixed on the extension bar, and two ends of the elastic pin are arranged in the sliding groove of the elastic supporting seat.

Preferably, the elastic supporting seat is provided with a groove for the sanding belt to pass through, a front handle is arranged on the elastic supporting seat and is held by the left hand of an operator, a rear handle is fixed on the motor base and is held by the right hand of the operator, and the rear handle is provided with a power switch and a switch locking button.

Preferably, the upper swing arm is provided with a swing angle adjusting plate, the swing angle adjusting plate is mounted beside a hinge shaft of the upper swing arm and the reversing seat, two positioning holes are formed in the circumferential direction of the hinge shaft, and the reversing seat is provided with an upper swing arm knob plunger capable of being inserted into the positioning holes for position locking beside the hinge shaft.

Preferably, the arm bodies of the upper swing arm and the front swing arm are of an integral structure and are provided with weight reduction grooves.

Preferably, the power wheel assembly comprises a motor, a motor base and a driving wheel, the driving wheel is of a cylindrical structure, is sleeved on the motor and is connected with an output shaft of the motor, the middle part of the motor is of a flange structure, and one end with the driving wheel is arranged in a cavity of the motor base. The outer surface of the driving wheel is provided with a groove, and the abrasive belt is clamped in the groove. The outer surface of a working wheel in the working wheel assembly is of a structure with a plurality of annular grooves.

Preferably, the electric bicycle further comprises a front protective cover and a rear protective cover, wherein the front protective cover is installed on the front handle, and the rear protective cover is installed on the motor base.

The utility model adopts the above technical scheme, after having polished the rail one side, lift up the abrasive band polisher, go up swing arm and switching-over seat around the rotatory 180 degrees of mounting base, alright polish the rail another side, need not pull down the card rail mechanism from the rail, consequently it is very convenient to operate. In addition, when the weld chamfer needs to be polished, the upper swing arm and the reversing seat can be rotated by a certain angle around the sliding seat.

The utility model discloses owing to increased positioning mechanism, can provide the working reference for the abrasive band of polishing, play the profile modeling positioning action, control the surplus height of the object of polishing to can improve the roughness of the face of polishing.

The utility model discloses owing to increased elastic support mechanism, accessible tensioning handle, tensioning connecting rod and extension bar form link mechanism, make the extension bar stretch out or contract through operation tensioning handle, are convenient for change abrasive band and abrasive band tensioning. Is more convenient and faster than adjusting the length of the lead screw.

Drawings

Fig. 1 is a schematic structural view of a small-sized steel rail welding seam polisher of the present invention.

Fig. 2 is a schematic structural diagram of the direction change of the small-sized steel rail welding seam polisher.

FIG. 3 is a working schematic diagram of a small-sized steel rail welding seam polisher when performing welding seam chamfering polishing.

Fig. 4 is a schematic view of the positioning mechanism of the sanding belt grinder of the present invention in use.

FIG. 5 is a schematic view of the small rail welding seam polisher for polishing the welding seam at the bottom of the rail.

Fig. 6 is a partial cross-sectional view of a belt sander according to the present invention.

Fig. 7 is a structural view of the belt sander according to the present invention.

Fig. 8 is an exploded view of the belt sander of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-8, a small-size rail welding seam polisher comprises an abrasive belt polisher 1, a front swing arm 2, an upper swing arm 3 and a rail clamping mechanism 4, wherein one end of the upper swing arm 3 is hinged to the rail clamping mechanism 4, the other end of the upper swing arm is hinged to the front swing arm 2, one end of the front swing arm 2 is hinged to the upper swing arm 3, the other end of the front swing arm is in threaded connection with the abrasive belt polisher 1, the abrasive belt polisher 1 comprises a power wheel assembly 1.1, an elastic supporting mechanism 1.2, a working wheel assembly 1.3, an abrasive belt 1.4 and a roller positioning mechanism 1.5, the abrasive belt 1.4 is sleeved on the power wheel assembly 1.1 and the working wheel assembly 1.3, and the power wheel assembly 1.1 and the working wheel assembly 1.3 are tensioned by the elastic supporting mechanism 1.2. The upper swing arm 3 is provided with a swing angle adjusting plate which is arranged beside a hinge shaft of the upper swing arm 3 and the reversing seat 4.1, two positioning holes are arranged along the circumferential direction of the hinge shaft, and the reversing seat 4.1 is provided with an upper swing arm knob plunger 4.1.2 which can be inserted into the positioning holes for position locking beside the hinge shaft.

As shown in fig. 2, after one side of the steel rail is polished, the abrasive belt sander 1 is lifted, the upper swing arm 3 and the reversing seat 4.1 rotate relative to the sliding seat 4.2 at the pin 4.1.1, and the abrasive belt sander 1 can be driven to rotate 180 degrees to polish the weld seam on the side opposite to the steel rail.

As shown in fig. 2, two sides of a pin 4.1.1 on a sliding seat 4.2 are respectively provided with 3 positioning holes 4.2.1, and a reversing knob plunger 4.1.2 which can be inserted into the positioning holes for position locking is arranged beside the pin 4.1.1 of the reversing seat 4.1, so that the rotation angle of the reversing seat 4.1 can be locked to meet different polishing operation requirements. The middle positioning hole is used for the height grinding operation of the front face of the welding seam, the positioning holes on the two sides are used for the chamfering grinding operation of the transition of the excess height of the welding seam, namely after the height of the welding seam is ground in place, the reversing seat is rotated 4.1 to the positioning holes on the two sides, the abrasive belt grinding machine deflects by a smaller angle at the moment, the chamfering grinding can be carried out on the two sides of the excess height of the welding seam, and the requirement of the smooth transition of the welding seam and the steel rail base metal is met.

As shown in fig. 2, 4 and 5, the upper swing arm 3 is provided with a swing angle adjusting plate 3.1, the swing angle adjusting plate 3.1 is installed beside a hinge shaft of the upper swing arm 3 and the reversing seat 4.1, two positioning holes 3.1.1 are arranged along the circumferential direction of the hinge shaft, and the reversing seat 4.1 is provided with an upper swing arm knob plunger 4.1.3 which can be inserted into the positioning holes for position locking beside the hinge shaft. As shown in fig. 5, when the upper swing arm knob plunger 4.1.3 is positioned with the lower positioning hole of the swing angle adjusting plate 3.1, the weld joints at the rail waist, the upper surface of the rail bottom and the side surface of the rail bottom can be polished, and when the upper swing arm knob plunger 4.1.2 is positioned with the upper positioning hole of the swing angle adjusting plate 3.1, the upper swing arm 3 is about to swing downwards relative to the rail clamping mechanism 4, and then the front swing arm 2 and the abrasive belt polisher 1 are correspondingly and downwards biased integrally, and the weld joints at the rail bottom can be polished. Because during the operation of each position of polishing of rail welding seam, go up swing arm 3 and all be in fixed state, provide stable fulcrum for preceding swing arm 2 and abrasive band polisher 1, make the operation of polishing laborsaving, be favorable to improving quality and the efficiency of polishing.

As shown in fig. 2, the rail clamping mechanism 4 comprises a reversing seat 4.1, a sliding seat 4.2 and a rail clamp 4.3, wherein the rail clamp 4.3 and the sliding seat 4.2 are connected by two linear bearings and locked by a star-shaped threaded handle 4.3.1. The rail clamp 4.3 adopts a C-shaped integrated clamping seat, and a T-shaped screw rod is used for clamping the clamping seat and the whole equipment to the rail. After the rail clamping device 4.3 is clamped and fixed on a rail, the sliding seat 4.2 can move through a linear bearing, the relative positions of the abrasive belt grinding machine 1 and a welding seam can be conveniently adjusted, the grinding equipment and the sleeper are prevented from interfering, and the star-shaped threaded handle 4.4 can be used for locking according to needs.

As shown in fig. 6, the elastic supporting mechanism 1.2 includes an elastic supporting seat 1.2.1, a guiding rod 1.2.2, an auxiliary guiding rod 1.2.3, a tension spring 1.2.4, a tension nut 1.2.5, and a quick telescopic mechanism 1.2.6, where the guiding rod 1.2.2 and the auxiliary guiding rod 1.2.3 are parallel to each other, fixedly connected to the elastic supporting seat 1.2.1, and slidably connected to the power wheel assembly 1.1, the tension spring 1.2.4 is located between the elastic supporting seat 1.2.1 and the power wheel assembly 1.1 and sleeved on the guiding rod 1.2.2, the tension nut 1.2.5 is installed on the elastic supporting seat 1.2.1, and the tightness degree of the abrasive belt 1.4 is adjusted by rotating the tension nut 1.2.5 to control the compression amount of the tension spring.

As shown in fig. 6, a quick telescopic mechanism 1.2.6 is disposed at one end of the elastic support seat 1.2.1 where the working wheel assembly 1.3 is disposed, the quick telescopic mechanism 1.2.6 includes a tensioning handle 1.2.6.1, a tensioning link 1.2.6.2, an extension bar 1.2.6.3, a locking wrench 1.2.6.4, and an elastic pin 1.2.6.5, the extension bar 1.2.6.3 is slidably connected with the elastic support seat 1.2.1, the extension bar 1.2.6.3 is fixedly connected with the working wheel assembly 1.3, a tensioning handle 1.2.6.1 is hinged in a middle groove of the elastic support seat 1.2.1, a tensioning link 1.2.6.2 is hinged with the extension bar 1.2.6.3 and the tensioning handle 1.2.6.1 to form a link mechanism, the extension bar 1.2.6.3 can be extended or contracted by operating the tensioning handle 1.2.6.1, so as to facilitate replacement and tensioning of an abrasive belt, which is much shorter than a lead screw. The elastic supporting seat is provided with a locking wrench 1.2.6.4 for locking the tensioning handle, an elastic pin 1.2.6.5 is fixed on the extension bar 1.2.6.3, and two ends of the elastic pin 1.2.6.5 are arranged in a sliding groove of the elastic supporting seat, so that the reliable stretching action and the reliable locking of the working position of the extension bar 1.2.6.3 can be ensured.

As shown in fig. 1 and 6, the polishing device further comprises a roller positioning mechanism 1.5 fixedly connected with the elastic support mechanism 1.2.1, wherein the roller positioning mechanism 1.5 comprises a positioning seat 1.5.1, a turning arm 1.5.2, a positioning wheel 1.5.3, a pin locking mechanism 1.5.4 and a ball plunger 1.5.5, the turning arm 1.5.2 is installed in a clamping groove of the positioning seat 1.5.1, one end of the turning arm is provided with the positioning wheel 1.5.3, the other end of the turning arm is hinged with the positioning seat 1.5.1, and the turning arm 1.5.2 drives the positioning wheel 1.5.3 to be in an extending position, so that a working reference can be provided for an abrasive belt at the working wheel assembly 1.3, a profiling positioning effect can be achieved by rolling on the surface of a base material steel rail in a non-welding area, the extra height of a polished object can be controlled, and the flatness of a polished surface can be improved. The turnover arm 1.5.2 can swing 180 degrees around the rotating shaft 1.5.6 in the groove of the positioning seat 1.5.1, and has two positions of extending and retracting the positioning wheel, when the turnover arm 1.5.2 is in the extending position, the positioning is firm by using the pin locking mechanism 1.5.4, when the turnover arm 1.5.2 is in the retracting position, the turnover arm 1.5.5 is locked by using the ball plunger 1.5.5, as shown in fig. 3, the turnover arm 1.5.2 is in the retracting position, and when the chamfer of the weld joint residual height is polished, the positioning wheel 1.5.3 can be prevented from interfering with the steel rail.

As shown in fig. 6, the pin locking mechanism 1.5.4 includes a pin locking seat 1.5.4.1, a positioning pin 1.5.4.2, a lever wrench 1.5.4.3, a spring, a retainer ring, and a nut, wherein the pin locking seat 1.5.4.1 is fixedly installed on the positioning seat 1.5.1, the lever wrench is hinged to the pin locking seat 1.5.4.1 through a pin shaft, the positioning pin 1.5.4.2 and the spring are installed in a hole of the pin locking seat 1.5.4.1, and the lever wrench 1.5.4.3 can pull the positioning pin 1.5.4.2 to move in the hole, so that the positioning pin 1.5.4.2 is pressed onto or separated from a pin hole of the flipping arm 1.5.2 under the action of the internal spring, that is, when the flipping arm 1.5.2 is extended, the positioning pin 1.5.4.2 is reliably locked to the positioning seat 1.5.1.

As shown in fig. 7 and 8, the abrasive belt sander 1 further comprises a front handle 1.6, a rear handle 1.7, a junction box 1.8, a front protective cover 1.9 and a rear protective cover 1.10, wherein the front handle 1.6 is installed on an elastic supporting seat 1.2.1, the rear handle 1.7 is fixed on a motor base 1.2, the rear handle 6.2 is provided with a power switch 1.7.1 and a switch locking button 1.7.2, the sanding motor 1.1.1 is convenient to start and stop in the handheld operation process, the front handle 5.5 and the rear handle 5.6 are respectively held by left and right hands of an operator, the position is reasonably set, and the operation is labor-saving. Preceding protection casing 1.9 is installed on preceding handle 1.6, and terminal box 1.8 and back protection casing 1.10 are installed on motor cabinet 1.2, set up the protection casing in handheld position and can play the guard action to personal safety, and have simple structure, light in weight's characteristics.

As shown in fig. 7 and 8, the power wheel assembly 1.1 includes a motor 1.1.1, a motor base 1.1.2, and a driving wheel 1.1.3, the driving wheel 1.1.3 is a cylindrical structure, and is sleeved on the motor 1.1.1 and connected with an output shaft of the motor, a flange mounting surface at the middle part of the motor 1.1.1 is mounted on the motor base 1.1.2, that is, one end with the driving wheel is mounted in a cavity of the motor base 1.1.2, the output shaft of the motor 1.1.1 drives the driving wheel 1.1.3 to rotate through a key, a groove is arranged on the outer surface of the driving wheel 1.1.3, and an abrasive belt 1.4 is clamped in the groove, so that the operation is safe and reliable, the nesting mounting manner of the motor 1.1 and the driving wheel 1.3 enables the width of the equipment to be significantly reduced, the appearance to be compact, and the installation adaptability of the equipment is improved.

As shown in fig. 6 and 8, the working wheel assembly 1.3 includes a wheel seat 1.3.1, a working wheel 1.3.2, a wheel axle 1.3.3, a rolling bearing, and a screw, wherein the working wheel 1.3.2 is connected with the wheel axle 1.3.3 through the rolling bearing, is mounted on the wheel seat 1.3.1, and the wheel axle 1.3.3 and the wheel seat 1.3.1 are fixed by the screw. The outer surface of the working wheel 1.3.2 is provided with a plurality of annular grooves, which is beneficial to the stable joint of the abrasive belt 1.4 and the working wheel 1.3.2.

The upper swing arm 3 and the front swing arm 2 are both of an integral structure and are provided with weight reduction grooves.

The utility model discloses owing to adopt link mechanism, reversing mechanism, pivot angle position adjustment locking mechanical system, abrasive band mode of polishing, motor as the power supply, can realize that the welding seam at the bottom of rail welded joint rail web and the rail is polished, and compact structure, light in weight, the simple operation, the feature of environmental protection is good.

Claims

1. A small-sized rail welding seam polisher comprises an abrasive belt polisher, a front swing arm, an upper swing arm and a rail clamping mechanism, wherein one end of the upper swing arm is hinged to the rail clamping mechanism, the other end of the upper swing arm is hinged to the front swing arm, one end of the front swing arm is hinged to the upper swing arm, the other end of the front swing arm is connected with the abrasive belt polisher, the abrasive belt polisher comprises a power wheel assembly, an elastic supporting mechanism, a working wheel assembly, an abrasive belt and a roller positioning mechanism, the abrasive belt is sleeved on the power wheel assembly and the working wheel assembly, the power wheel assembly and the working wheel assembly are tensioned by the elastic supporting mechanism, the elastic supporting mechanism comprises an elastic supporting seat, a guide rod, a tensioning spring and a tensioning nut, the tensioning spring is positioned between the elastic supporting seat and the power wheel assembly and sleeved on the guide rod, and is characterized in that the rail clamping mechanism comprises a reversing seat, a sliding seat and a rail clamper, the rail clamper and the sliding seat are connected by two linear bearings, and the handle is used for locking, one end of the upper swing arm is hinged with the reversing seat through a pin shaft in the horizontal direction, the reversing seat is hinged with the sliding seat through a pin shaft in the vertical direction, the sliding seat is respectively provided with 3 positioning holes at two sides of the pin shaft in the vertical direction, and the reversing seat is provided with a reversing knob plunger which can be inserted into the positioning holes for position locking beside the pin shaft in the vertical direction.

2. The small rail welding seam polisher according to claim 1 further comprising a roller positioning mechanism fixedly connected to the resilient support mechanism, the roller positioning mechanism comprising a positioning seat, a flipping arm, a positioning wheel, a pin locking mechanism, and a ball plunger, the flipping arm being mounted in a positioning seat slot, the positioning wheel being mounted at a front end of the flipping arm, a rear end of the flipping arm being hinged to the positioning seat, the pin locking mechanism being mounted at a front end of the positioning seat hinge shaft, the ball plunger being mounted at a rear end of the hinge shaft, and a pin locking mechanism and a locking hole of the ball plunger being respectively disposed at two sides of the hinge shaft of the flipping arm.

3. The small rail welding line grinding machine according to claim 1, wherein the elastic support mechanism is provided with a quick telescoping mechanism at one end of the working wheel assembly, the quick telescoping mechanism comprises a tensioning handle, a tensioning connecting rod, an extension rod, a locking wrench and an elastic pin, the extension rod is slidably connected with the elastic support seat, the extension rod is fixedly connected with the working wheel assembly, the middle part of the elastic support seat is provided with a groove, the tensioning handle is hinged in the groove, and the tensioning connecting rod is respectively hinged with the extension rod and the tensioning handle.

4. A small rail weld grinding machine according to claim 3, wherein the resilient support base is provided with a locking wrench for locking the tension handle, the resilient pin is fixed to the extension bar, and both ends of the resilient pin are fitted into the slide grooves of the resilient support base.

5. A small rail weld grinding machine as claimed in claim 4, wherein the resilient support base is provided with a slot through which the grinding belt passes, a front handle is mounted on the resilient support base, the front handle is held by the left hand of the operator, a rear handle is fixed to the motor base and held by the right hand of the operator, and the rear handle is provided with a power switch and a switch lock button.

6. A small-sized rail welding seam grinding machine according to claim 5, characterized in that said upper swing arm is provided with a swing angle adjusting plate, said swing angle adjusting plate is installed beside a hinge shaft of the upper swing arm and a reversing seat, and two positioning holes are provided along the circumferential direction of the hinge shaft, and said reversing seat is provided beside the hinge shaft with an upper swing arm knob plunger which can be inserted into the positioning holes for position locking.

7. A small-sized rail welding seam grinding machine as claimed in claim 6, characterized in that the arm bodies of the upper swing arm and the front swing arm are of an integral structure and are provided with weight-reducing grooves.

8. The small rail weld grinding machine according to claim 7, further comprising an auxiliary guide bar disposed parallel to the guide bar, wherein the guide bar and the auxiliary guide bar are both fixedly connected to the elastic support base and slidably connected to the power wheel assembly.

9. The small rail welding seam polisher according to claim 8 wherein the power wheel assembly includes a motor, a motor base, and a drive wheel, the drive wheel is cylindrical and is fitted over the motor and connected to the output shaft of the motor, the middle portion of the motor is flange-shaped, the end with the drive wheel is mounted in the cavity of the motor base, the outer surface of the drive wheel is provided with a groove, and the abrasive belt is clamped in the groove.

10. The sander for minor rail welds according to claim 9, wherein the outer surface of the wheel in said wheel assembly is in the form of a plurality of annular grooves.

11. A small rail weld grinding machine as defined in claim 10 further including a front shield mounted to the front handle and a rear shield mounted to the motor mount.