Railway track surface grinding device

Abstract

The present application relates to the technical field of track repair, in particular to a track surface polishing device for railway maintenance, which comprises a lifting mechanism arranged on a rack, a transverse sliding member for driving the lifting mechanism to move and a rotation control mechanism for driving the lifting mechanism to rotate, the lifting mechanism is provided with a sliding member, a locking member and a toggle mechanism connected with the lifting mechanism in rotation, the track surface polishing device of the present application switches between the fixed connection and the sliding connection between the polishing machine and the lifting mechanism, so that when the angle of the grinding head is adjusted, the grinding head is automatically adjusted in position according to the surface profile of the track by taking advantage of the sliding connection, and after the adjustment, the grinding head contacts the track surface, since the spacing between the two adjacent insertion holes is less than the safety distance reserved between the grinding head and the track in the traditional way, the screw does not need to rotate a large number of turns, thereby improving the operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of track repair technology, and more specifically, to a track surface grinding device for railway maintenance. Background Technology

[0002] During long-term train operation, the continuous compression and impact between the wheels and rails can cause various types of damage and wear on the rail surface, such as wavy wear, abrasions, peeling, side wear, cracks, railhead crushing, and thick edges. These defects not only affect passenger comfort but also endanger train safety. Therefore, it is necessary to repair the rails regularly or irregularly using professional grinding equipment.

[0003] The grinding area and method differ depending on the condition of the rails. Some rails only require grinding the center of the rail top, while others require grinding both the rail top and both ends simultaneously. Therefore, for multi-area grinding needs, a grinding device equipped with an adjustment mechanism is required to flexibly adjust the position and angle of the grinding head. However, limited by the power supply conditions around the rails, most existing adjustment mechanisms rely on manually rotating a screw, leading to the following problems in practical applications:

[0004] Because the grinding head needs to be tilted when grinding the top and bottom ends of the rail, and needs to be returned to a horizontal position when grinding the top of the rail, the operator must manually rotate the screw to move the grinding head away from the rail during the switching between horizontal and tilted positions, leaving a safe distance (usually more than 1.5cm) to avoid interference. However, for some precision grinding devices, the feed rate of the grinding head is usually less than 1mm, which means that the operator often needs to rotate the screw many times to obtain sufficient angle adjustment space. In addition, if the adjustment distance is insufficient or the operator misoperates and causes the grinding head to move continuously towards the rail, it is very easy for the grinding head to be squeezed and damaged. Summary of the Invention

[0005] The purpose of this invention is to provide a track surface grinding device for railway maintenance. By setting the grinding head and the lifting mechanism as a fixed sliding structure, the grinding head is always in contact with the track surface, thereby solving the problems mentioned in the background art, namely, that operators often need to rotate the screw many times to obtain sufficient angle adjustment space, and that the grinding head is easily damaged by compression.

[0006] To achieve the above objectives, a railway maintenance track surface grinding device includes a lifting mechanism mounted on a frame, a transverse sliding member for driving the lifting mechanism to move, and a rotation control mechanism for driving the lifting mechanism to rotate. The lifting mechanism is provided with a sliding member, a locking member, and a toggle mechanism that is rotatably connected to the lifting mechanism.

[0007] The sliding component is sleeved outside the lifting mechanism and connected to a grinding machine;

[0008] The locking element includes a rod that is elastically disposed on one side of the sliding element and slides through the sliding element;

[0009] The actuating mechanism is rotatably positioned between the release position and the actuating position. In the release position, the insert rod is elastically inserted into the lifting mechanism, so that the sliding member and the lifting mechanism are in a fixed connection state. In the actuating position, the actuating mechanism pushes the insert rod away from the lifting mechanism, so that the sliding member and the lifting mechanism are in a sliding connection state.

[0010] In the sliding connection state, the grinding head of the grinder rests against the surface of the track and automatically adjusts its position according to the surface contour of the track;

[0011] The lifting mechanism drives the actuating mechanism to switch between the release position and the actuating position during rotation.

[0012] Based on this, the lifting mechanism includes a vertical cylinder fixedly connected to the rotation control mechanism, a screw rotatably disposed inside the vertical cylinder, and a sleeve threadedly connected to the screw.

[0013] The outer ring of the vertical cylinder is slidably fitted with a lifting sleeve, and the lifting sleeve is fixedly connected to the sleeve rod through an opening on one side of the vertical cylinder; the side wall of the lifting sleeve is provided with multiple insertion holes for inserting the rod, and the distance between two adjacent insertion holes is less than 3mm.

[0014] Based on this, the insertion rod is set at the corresponding insertion hole of the sliding member, and a connecting spring is provided between the insertion rod and the sliding member to elastically connect the two; the insertion rod is inserted into the insertion hole through the elasticity of the connecting spring, so that the sliding member and the lifting sleeve are fixedly connected.

[0015] The track surface grinding device of the present invention switches between a fixed connection and a sliding connection between the grinding machine and the lifting mechanism. When adjusting the grinding head angle, the advantage of the sliding connection is utilized to allow the grinding head to automatically adjust its position according to the surface contour of the track. After adjustment, the grinding head contacts the track surface. At this point, it is only necessary to control the insertion rod to be inserted into the insertion hole. The distance between two adjacent insertion holes is less than the safety distance reserved between the grinding head and the track in the traditional method. Therefore, the screw does not need to rotate many times, improving the operating efficiency.

[0016] Furthermore, the grinding head is in a sliding connection with the lifting mechanism during the angle adjustment process, so the grinding head will not be squeezed by the track. In addition, after the grinding head angle is adjusted, the lifting sleeve is moved upward to insert the insertion rod into the insertion hole. In this way, even if the operator accidentally rotates the screw too much, the screw will only drive the grinding head upward, thereby reducing the probability of the grinding head being squeezed and broken. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the working state of a grinding head in the prior art;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the lifting mechanism of the present invention;

[0020] Figure 4 This is a schematic diagram of the vertical cylinder structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the lifting sleeve of the present invention;

[0022] Figure 6 This is a schematic diagram of the sliding component of the present invention;

[0023] Figure 7 This is a schematic diagram of the insertion rod of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the dial plate of the present invention;

[0025] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point A;

[0026] Figure 10 This is a schematic diagram of the working state of the dial of the present invention;

[0027] Figure 11 This is a schematic diagram of the connection structure between the handwheel and the shaft of the present invention. Figure 1 ;

[0028] Figure 12 This is a schematic diagram of the connection structure between the handwheel and the shaft of the present invention. Figure 2 ;

[0029] Figure 13 This is a schematic diagram of the working state of the grinding head of the present invention;

[0030] Figure 14 This is a schematic diagram of the working state of the insertion rod of the present invention.

[0031] The meanings of the labels in the diagram are as follows:

[0032] 100. Frame; 101. Lead screw; 102. Lateral adjusting cylinder; 103. Support rod; 104. Roller; 105. Shaft hole; 106. Rotating shaft; 107. Scale; 120. Grinding head; 121. Power system; 130. Lifting mechanism; 131. Vertical cylinder; 132. Screw; 133. Opening; 134. Handwheel; 140. Lifting sleeve; 141. Sleeve rod; 142. Protrusion; 143. 144. Insertion hole; 150. Baffle; 151. Sliding component; 152. Insert rod; 153. Connecting spring; 154. Force-bearing part; 160. Dial plate; 161. Shaft; 162. Limiting block; 170. Driving gear; 171. Driven gear; 172. Slider; 173. Round rod; 174. Locking block; 175. Locking groove; 176. Magnet block; 180. Supporting spring; 181. Pad; 200. Track. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] Track 200 is used for train travel. During long-term train operation, the continuous compression and impact between the wheels and track 200 can cause various types of damage and wear on the surface of track 200. Therefore, a grinding device is needed to grind the surface of track 200. Figure 2As shown, the grinding device is used to grind one rail of the track 200 respectively, and has a frame 100. The frame 100 is guided on the track 200 by guide rollers, so that the frame 100 can move along the length direction of the track 200.

[0037] The frame 100 has two parallel crossbars and two parallel longitudinal bars, which are connected to each other to make the frame 100 a closed shape.

[0038] A transverse sliding component is mounted on the frame 100 and is used to move the grinder along the width of the track 200. The transverse sliding component mainly consists of a lead screw 101 and a transverse adjusting cylinder 102. One end of the lead screw 101 is rotatably mounted on one end of the frame 100, and the other end is rotatably mounted on a longitudinal rod located in the middle of the frame 100. The transverse adjusting cylinder 102 is fitted onto the outer ring of the lead screw 101 and threadedly connected to it. The transverse adjusting cylinder 102 rests on two crossbars of the frame 100 via support rods 103 on both sides. The contact between the support rods 103 and the crossbars counteracts the rotational force exerted by the lead screw 101 on the transverse adjusting cylinder 102. Rollers 104 at the ends of the support rods 103 guide the transverse adjusting cylinder 102 on the two crossbars of the frame 100. Thus, when the lead screw 101 rotates, it drives the transverse adjusting cylinder 102 to move through helical force.

[0039] When operating in areas lacking power supply, the lead screw 101 is driven to rotate by a pulley connected to the end of the lead screw 101. The structure and position of the pulley are referenced. Figure 2 .

[0040] like Figure 3 As shown, the rotating shaft 106 is rotatably mounted in the shaft hole 105 at the bottom of the transverse adjusting cylinder 102. The lifting mechanism 130 is fixedly mounted at the end of the rotating shaft 106 and connected to the grinder. The rotating shaft 106 can drive the grinder to rotate via the lifting mechanism 130. To facilitate operators in understanding the rotation angle, a scale 107 is provided on one side of the transverse adjusting cylinder 102, and an indicator rod is fixedly connected to the rotating shaft 106. The rotation angle of the rotating shaft 106 is displayed in real time via the indicator rod.

[0041] It should be understood that a rotation control mechanism is connected to the end of the rotating shaft 106. The rotation control mechanism is connected to the rotating shaft 106 and is used to drive the rotating shaft 106 to rotate. The structure of the rotation control mechanism can be referred to in the patent document with publication number CN111971434B or the prior art, and will not be described in detail here.

[0042] by Figure 1Taking the current state as an example, when the grinding head 120 needs to be switched from an inclined position to a horizontal position, the grinding head 120 of the grinding machine can be directly driven to rotate through the rotating shaft 106 and the lifting mechanism 130. However, this would cause interference between the lower right corner of the grinding head 120 and the top of the track 200. Therefore, it is necessary to first move the grinding head 120 upward through the lifting mechanism 130, then drive the grinding head 120 of the grinding machine to rotate to a horizontal position through the rotating shaft 106 and the lifting mechanism 130, then rotate the lead screw 101 so that the horizontal adjusting cylinder 102 moves the grinding head 120 to the top of the track 200 through the lifting mechanism 130, and finally drive the grinding head 120 downward to the top of the track 200 through the lifting mechanism 130. In this process, in order to reduce the number of rotations of the lifting mechanism 130 and increase the safety of the grinding head 120, the present invention provides a sliding member 150, a locking member, and a toggle mechanism rotatably connected to the lifting mechanism 130 between the lifting mechanism 130 and the grinding machine, wherein:

[0043] The sliding member 150 is sleeved on the outside of the lifting mechanism 130 and fixedly connected to the grinding machine; the locking member includes a plug rod 151 that is elastically disposed on one side of the sliding member 150 and slides through the sliding member 150; the actuating mechanism is rotatably disposed between the release position and the actuating position. In the release position, the plug rod 151 is elastically inserted into the lifting mechanism 130, so that the sliding member 150 and the lifting mechanism 130 are in a fixed connection state; in the actuating position, the actuating mechanism pushes the plug rod 151 away from the lifting mechanism 130, so that the sliding member 150 and the lifting mechanism 130 are in a sliding connection state. In the sliding connection state, the grinding head 120 abuts against the surface of the track 200 and automatically adjusts its own position according to the surface contour of the track 200.

[0044] In the above, the lifting mechanism 130 drives the actuating mechanism to switch between the release position and the actuating position during rotation.

[0045] like Figure 4 As shown, the lifting mechanism 130 includes a vertical cylinder 131 fixedly mounted on the top of one end of a rotating shaft 106, a screw 132 rotatably mounted inside the vertical cylinder 131, and a lifting sleeve 140 threadedly connected to the screw 132, wherein the lifting sleeve 140 is slidably sleeved on the outer ring of the vertical cylinder 131. Specifically, the top end of the screw 132 rotatably passes through the top of the vertical cylinder 131 and is connected to a handwheel 134, allowing the operator to drive the screw 132 to rotate via the handwheel 134. The outer diameter of the screw 132 is smaller than the inner diameter of the vertical cylinder 131. A sleeve 141 is threadedly fitted onto the outer ring of the screw 132. A protrusion is partially provided on the sleeve 141, extending to the outside through an opening 133 on one side of the vertical cylinder 131. Thus, when the screw 132 applies a rotational force to the sleeve 141 during rotation, the sleeve 141 is engaged with the side wall of the opening 133 by the protrusion, preventing the sleeve 141 from rotating; therefore, the sleeve 141 only moves up and down.

[0046] like Figure 5 As shown, a protrusion 142 is provided on one side of the lifting sleeve 140. This protrusion 142 is used to accommodate the protrusion of the sleeve rod 141, so that the protrusion of the sleeve rod 141 is located inside the protrusion 142, and the two are fixedly connected by a bolt provided at the end of the protrusion 142. In this way, the sleeve rod 141 can drive the lifting sleeve 140 to move up and down. In addition, the side wall of the protrusion 142 is provided with a plurality of insertion holes 143 for inserting the insertion rod 151, and the distance between two adjacent insertion holes 143 is less than 3mm.

[0047] like Figure 3 , Figure 5 and Figure 6 As shown, the sliding member 150 is slidably sleeved on the outer ring of the lifting sleeve 140, and a baffle 144 is provided at the end of the lifting sleeve 140 to prevent the sliding member 150 from falling off. The sliding member 150 is a cylindrical structure with one side protruding outward, and its protruding part is used to fit the protrusion 142. In addition, the protruding part of the sliding member 150 is fixedly connected to the power system 121 of the grinder.

[0048] like Figure 6 and Figure 7 As shown, the insertion rod 151 is slidably inserted into the part of the sliding member 150 corresponding to the protrusion 142, and the insertion direction of the insertion rod 151 is perpendicular to the sliding direction of the sliding member 150, that is, the insertion rod 151 is inserted horizontally, and the sliding member 150 slides vertically. The elastic setting of the insertion rod 151 is achieved by the connecting spring 152, that is, the connecting spring 152 is set between the end of the insertion rod 151 and the side wall of the sliding member 150. In this way, when it is not actuated by the actuating mechanism, the insertion rod 151 is inserted into the insertion hole 143 through the elasticity of the connecting spring 152. At this time, when the lifting sleeve 140 moves up and down, it will also drive the sliding member 150 to move together.

[0049] One side of the insertion rod 151 extends outward to form a force-bearing part 153; such as Figure 8 As shown, the actuating mechanism includes a lever 160, which is rotatably connected to the end of the vertical cylinder 131 via shafts 161 at its bottom and top ends. The lever 160 is located between the sliding member 150 and the force-receiving part 153. Figure 10 As shown, the solid line indicates that the lever 160 is in the released position. In this position, the lever 160 is not in contact with the force-receiving part 153, so the insertion rod 151 will be inserted into the insertion hole 143. The dashed line indicates that the lever 160 is in the toggle position. In this position, the end of the lever 160 pushes the force-receiving part 153, at which time the force-receiving part 153 drives the insertion rod 151 to disengage from the insertion hole 143.

[0050] Furthermore, in order to maintain the toggle position of lever 160, such as Figure 8 and Figure 9As shown, a limit block 162 is provided at the top of the vertical cylinder 131, and the limit block 162 is located on the path of the lever 160 rotating in the direction of the lever position. In this way, the limit block 162 can restrict the lever 160 to a certain position. Figure 10 The dotted line indicates the state. At this time, the lever 160 has rotated 100 degrees relative to the release position (this angle is for example and is not a limitation). The force-receiving part 153 applies a rotational force to the lever 160 in the direction of the limiting block 162 through the elasticity of the connecting spring 152. The lever 160 is blocked by the limiting block 162, so the lever 160 can continuously hold the plug 151.

[0051] like Figure 11 As shown, by rotatably connecting the shaft 161 to the handwheel 134, the operator can drive the shift plate 160 and the screw 132 simply by turning the handwheel 134. The specific structure is as follows:

[0052] A slider 172 is fixedly mounted on the bottom of the handwheel 134, and a slot 175 is formed on the top of the slider 172. A round rod 173 that slides through the slider 172 is fixedly connected to the top of the screw 132, and a locking block 174 whose shape matches the slot 175 is fixedly connected to the top of the round rod 173. In addition, a drive gear 170 is fixedly connected to the bottom of the slider 172, and a driven gear 171 that meshes with the drive gear 170 is fixedly connected to the top of the shaft 161. With this design, when it is necessary to drive the dial 160 to rotate, the handwheel 134 is lowered to... Figure 11 In the current state, the slot 175 is disengaged from the locking block 174. Then, the handwheel 134 is rotated, which drives the dial plate 160 to rotate only through the driving gear 170 and the driven gear 171. When it is necessary to drive the screw 132 to rotate, simply control the handwheel 134 to move upward, so that the locking block 174 enters the slot 175. At this time, the handwheel 134 drives the screw 132 to rotate through the locking block 174.

[0053] Furthermore, in order to maintain the position of handwheel 134 and reduce the burden on operators in adjusting the position of handwheel 134, the present invention provides the following structure:

[0054] exist Figure 11 In the illustrated embodiment, a magnet 176 is fixedly mounted on the top of the latch 174, magnetically engaging with the handwheel 134. Thus, under normal conditions, the magnet 176 attracts the handwheel 134, preventing it from moving downwards. When the dial 160 needs to be driven, simply press the handwheel 134 to disengage it from the magnet 176. At this time, the slider 172 drives the drive gear 170 to move downwards to the driven gear 171.

[0055] exist Figure 12In the illustrated embodiment, a support spring 180 is connected to the top of the screw 132, and a pad 181 is fixedly connected to the top of the support spring 180. In this embodiment, the support spring 180 supports the handwheel 134 at the top through its own elasticity, i.e., the locking block 174 is in the locking slot 175. When it is necessary to drive the dial 160, simply press the handwheel 134. At this time, the handwheel 134 is compressed, and the slider 172 drives the driving gear 170 to move down to the driven gear 171. The pad 181 can prevent the slider 172 from affecting the support spring 180 during rotation.

[0056] The working principle of this invention will be described in detail below:

[0057] Taking the switching of the grinding head 120 from an inclined state to a horizontal state as an example. When the grinding head 120 is in Figure 13 When the grinding head 120 is in the middle left half state, directly control the grinding head 120 to rotate to the right. At this time, the lower right end of the grinding head 120 contacts the top of the track 200. The track 200 applies a reaction force to the grinding head 120, forcing the grinding head 120 to move upward along the arrow direction via the slider 150 until the grinding head 120 is in the middle left half state. Figure 13 When the right half of the cylinder is in its current state, stop rotating. Next, rotate the lead screw 101 to move the transverse adjusting cylinder 102 directly above the track 200.

[0058] Then, control the dial 160 to rotate to Figure 10 In the solid line state, the insertion rod 151 will be reset by the connecting spring 152. If the connecting spring 152 is inserted into the insertion hole 143, the sliding part 150 is fixedly connected to the lifting sleeve 140, and the grinding operation can be performed directly.

[0059] If the connecting spring 152 is located between two adjacent sockets 143, then as follows: Figure 14 As shown, rotating the screw 132 causes the lifting sleeve 140 to move upward (or downward) along the black arrow. The lifting sleeve 140 then moves the insertion hole 143 upward. Since the distance between two adjacent insertion holes 143 is less than 3mm, the screw 132 only needs to rotate a few times to move one of the insertion holes 143 to the front of the insertion rod 151. At this time, the insertion rod 151 is inserted into the insertion hole 143 along the direction of the white arrow, so that the sliding part 150 is fixedly connected to the lifting sleeve 140. At this time, the grinding operation can be performed.

[0060] It should be noted that, during the rotation of the traditional grinding head 120, a safety distance of more than 1.5cm is usually required between it and the track 200. Therefore, after rotation, the grinding head 120 needs to be driven to move down by about 1.5cm to contact the track 200.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A track surface grinding device for railway maintenance, comprising a lifting mechanism (130) arranged on a frame (100), a transverse sliding member for driving the lifting mechanism (130) to move, and a rotation control mechanism for driving the lifting mechanism (130) to rotate, characterized in that: The lifting mechanism (130) is provided with a sliding piece (150), a locking piece and a dialing mechanism rotatably connected with the lifting mechanism (130); The sliding piece (150) is sleeved outside the lifting mechanism (130) and is connected with the grinding machine; The locking piece comprises an insertion rod (151) elastically arranged on one side of the sliding piece (150) and slidingly penetrating the sliding piece (150); The dialing mechanism is rotatably arranged between a release position and a dialing position, in the release position, the insertion rod (151) is elastically inserted into the lifting mechanism (130), so that the sliding piece (150) and the lifting mechanism (130) are in a fixed connection state; in the dialing position, the dialing mechanism pushes the insertion rod (151) to be separated from the lifting mechanism (130), so that the sliding piece (150) and the lifting mechanism (130) are in a sliding connection state; In the sliding connection state, the grinding head (120) of the grinding machine abuts against the surface of the track (200) and automatically adjusts its position according to the surface profile of the track (200); The lifting mechanism (130) comprises a vertical cylinder (131) fixedly connected with the rotation control mechanism, a screw rod (132) rotatably arranged in the vertical cylinder (131) and a sleeve rod (141) threadedly connected with the screw rod (132); the outer ring of the vertical cylinder (131) is slidingly sleeved with a lifting sleeve (140); One side of the insertion rod (151) extends outward to form a stress receiving portion (153); The dialing mechanism comprises a dialing plate (160) rotatably arranged between the two ends of the vertical cylinder (131), the dialing plate (160) is located between the sliding piece (150) and the stress receiving portion (153), and the dialing plate (160) pushes the insertion rod (151) out of the insertion hole (143) through the stress receiving portion (153) during rotation; The top of the screw rod (132) is connected with a hand wheel (134); The bottom of the hand wheel (134) is fixedly provided with a sliding block (172), and the top of the sliding block (172) is provided with a clamping groove (175); The top of the screw rod (132) is fixedly connected with a circular rod (173) slidingly penetrating the sliding block (172), and the top of the circular rod (173) is fixedly connected with a clamping block (174) which is adapted to the clamping groove (175); The sliding block (172) is rotatably connected with a shaft rod (161) arranged at the top end of the dialing plate (160) at a preset height; When the sliding block (172) is rotatably connected with the shaft rod (161), the dialing mechanism is driven to switch between the release position and the dialing position during rotation of the lifting mechanism (130).

2. The rail surface grinding apparatus for railway maintenance according to claim 1, characterized by: The lifting sleeve (140) and the sleeve rod (141) are fixedly connected through an opening (133) on one side of the vertical cylinder (131); The side wall of the lifting sleeve (140) is provided with a plurality of insertion holes (143) for inserting the insertion rod (151).

3. The rail surface grinding apparatus for railway maintenance according to claim 2, characterized by: The distance between two adjacent insertion holes (143) is less than 3mm.

4. The rail surface grinding apparatus for railway maintenance according to claim 2, characterized by: The sliding piece (150) is slidingly sleeved outside the outer ring of the lifting sleeve (140) and is fixedly connected with the grinding machine.

5. The rail surface grinding apparatus for railway maintenance according to claim 4, characterized by: The insertion rod (151) is arranged at the position corresponding to the insertion hole (143) of the sliding piece (150), and a connecting spring (152) is arranged between the insertion rod (151) and the sliding piece (150) to elastically connect the two; the insertion rod (151) is elastically inserted into the insertion hole (143) through the connecting spring (152), so that the sliding piece (150) is fixedly connected with the lifting sleeve (140).

6. The rail surface grinding apparatus for railway maintenance according to claim 5, characterized by: The top end of the vertical cylinder (131) is provided with a limiting block (162), and the limiting block (162) is located on the path of the rotation of the shifting plate (160) to the shifting position.

7. The rail surface grinding apparatus for railway maintenance according to claim 5, characterized by: The top of the clamping block (174) is fixedly provided with a magnet block (176) which is magnetically attracted to the hand wheel (134).

8. The rail surface grinding apparatus for railway maintenance of claim 5, wherein: After the angle adjustment of the grinding head (120) is completed, the screw rod (132) drives the lifting sleeve (140) to move upwards, so that the lifting sleeve (140) is fixedly connected with the sliding piece (150) during the upward movement.

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