Safety protection structure for hoisting machinery

Abstract

The application provides a safety protection structure for hoisting machinery, and relates to the technical field of hoisting machinery, which comprises a vehicle frame and a track, wheels are arranged on the vehicle frame, the wheels roll along the track to move the vehicle frame along the track, an installation frame is arranged at the end of the vehicle frame, two guide wheels are rotatably arranged on the installation frame, and the two guide wheels are arranged on the two sides of the track; when the vehicle frame runs to one side of the track, the two guide wheels are subjected to different pressure and abrasion speed of the track, the installation frame is controlled to move from a first position to a second position, the guide wheels are separated from the track, the installation frame is controlled to rotate around a first axis to exchange the positions of the two guide wheels relative to the track, that is, the guide wheel originally subjected to large pressure and large abrasion degree of the track is exchanged with the guide wheel originally subjected to small pressure and small abrasion degree of the track, and the abrasion degree and actual service life of the two guide wheels tend to be consistent in subsequent running, thereby reducing the frequency of replacement and maintenance.

Description

Technical Field

[0001] This invention relates to the field of lifting machinery technology, and in particular to a safety protection structure for lifting machinery. Background Technology

[0002] Gantry cranes, also known as portal cranes, are heavy-duty lifting equipment widely used in outdoor freight yards, material yards, and bulk cargo loading and unloading operations. They are characterized by high site utilization, large operating range, wide adaptability, strong versatility, and stable structure. A gantry crane consists of a main beam and legs forming a portal-shaped structure, which, together with the hoisting mechanism and electrical components, is used for lifting and hoisting operations. It also features a traveling mechanism, which includes a frame, wheels, and rails. There are generally two types of traveling mechanisms: a trolley traveling mechanism and a trip trolley traveling mechanism, to control the overall machine's translation and the translation of the lifting equipment, respectively.

[0003] To ensure the stability and safety of the traveling mechanism, anti-derailment structures have been developed. These structures typically rely on two guide wheels that roll along the side of the track. However, common anti-derailment structures have the following drawbacks: when the chassis is tilted to one side of the track, the two guide wheels experience different pressures and wear rates, leading to different lifespans and increased replacement and maintenance frequency.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a safety protection structure for lifting machinery to address the problems existing in current anti-derailment structures.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A safety protection structure for lifting machinery includes a frame and a track. Wheels are mounted on the frame and roll along the track to move the frame along the track. A mounting bracket is located at the end of the frame, and two guide wheels are rotatably mounted on the mounting bracket, respectively positioned on both sides of the track. The mounting bracket is movable between a first position and a second position. In the first position, the guide wheels are in rolling contact with the track; in the second position, the guide wheels are disengaged from the track. The mounting bracket is also movable around a first axis to interchange the positions of the two guide wheels relative to the track. The first axis is parallel to the length direction of the track.

[0008] Furthermore, within a preset time period, when the difference in the number of rotations of the two guide wheels is greater than a preset value, the mounting bracket moves from the first position to the second position.

[0009] Furthermore, the guide wheel is slidably disposed on the mounting bracket along its radial direction, and an elastic element is provided between the guide wheel and the mounting bracket, so that the guide wheel tends to move closer to the track.

[0010] Furthermore, the guide wheel is provided with a driving structure, which is used to move the guide wheel along its axial direction when the guide wheel is in rolling contact with the track.

[0011] Furthermore, the drive structure includes two helical grooves formed on the outer circumferential surface of the guide wheel. The two helical grooves have the same pitch and opposite directions of rotation. Each helical groove has a head end and a tail end. The head ends of the two helical grooves are connected to each other, and the tail ends of the two helical grooves are connected to each other. The side of the track is located in one of the helical grooves.

[0012] Furthermore, the mounting bracket is movable between the second position and the third position. When in the second position, the two guide wheels are relatively far apart to disengage from the track. When in the third position, the mounting bracket rotates about the first axis.

[0013] Furthermore, two mounting brackets are provided and slidably disposed at the ends of the vehicle frame. Each mounting bracket is provided with a guide wheel, and the ends of the vehicle frame are provided with a driving member for moving the two mounting brackets relative to each other.

[0014] Furthermore, the mounting bracket is provided with a rotating shaft coaxial with the guide wheel, and the guide wheel is slidably connected to the rotating shaft and can rotate synchronously with the rotating shaft.

[0015] Furthermore, the mounting bracket is provided with a locking pin that can slide along the axial direction of the guide wheel. The locking pin is located in one of the spiral grooves. The mounting bracket is provided with two limiting members to limit the sliding range of the locking pin.

[0016] Furthermore, when the locking pin is stationary relative to the mounting bracket, the guide wheel can move along its axial direction and rotate.

[0017] The beneficial effects of this invention are as follows: When the vehicle frame is tilted to one side of the track, the two guide wheels experience different pressures and wear rates from the track. The mounting bracket is controlled to move from a first position to a second position, causing the guide wheels to disengage from the track. Then, the mounting bracket is controlled to rotate around a first axis to swap the positions of the two guide wheels relative to the track. In other words, the guide wheel that originally experienced high track pressure and wear is swapped with the guide wheel that originally experienced low track pressure and wear. During subsequent operation, the wear degree and actual lifespan of the two guide wheels tend to be consistent, reducing the frequency of replacement and maintenance. Attached Figure Description

[0018] Figure 1 A first-view isometric view of the safety protection structure for lifting machinery provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Axonometric drawing from a second perspective of the safety protection structure for medium-lift machinery;

[0020] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 for Figure 1 The front view;

[0022] Figure 5 for Figure 1 Exploded views of some parts;

[0023] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0024] Figure 7 for Figure 3 Another state diagram;

[0025] Figure 8 for Figure 7 Another state diagram.

[0026] in:

[0027] 100. Frame; 101. Track; 102. Wheel;

[0028] 200. Mounting bracket; 201. Guide wheel; 202. End frame; 203. Longitudinal rail; 204. Slide plate; 205. First motor; 206. Gear; 207. Roller; 208. Rack; 209. Second motor; 210. Rotating frame; 211. Encoder; 212. Elastic element; 213. Spiral groove; 214. Driving element; 215. Rotating shaft; 216. Long strip through hole; 217. Slider; 218. Locking pin; 219. Limiting element; 220. Longitudinal groove; 221. Round shaft; 222. Splined shaft. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] like Figures 1 to 8 As shown, this embodiment of the invention provides a safety protection structure for lifting machinery, including a frame 100 and a track 101. The frame 100 is provided with wheels 102, which roll along the track 101 to move the frame 100 along the track 101. A mounting frame 200 is provided at the end of the frame 100, and two guide wheels 201 are rotatably provided on the mounting frame 200. The two guide wheels 201 are respectively disposed on both sides of the track 101. The mounting frame 200 can move between a first position and a second position. When in the first position, the guide wheels 201 are in rolling contact with the track 101. When in the second position, the guide wheels 201 are disengaged from the track 101, and the mounting frame 200 can rotate around a first axis to change the position of the two guide wheels 201 relative to the track 101.

[0033] When the frame 100 is running on one side of the track 101, the two guide wheels 201 experience different pressure and wear rates from the track 101. The mounting bracket 200 is then moved from the first position to the second position to disengage the guide wheels 201 from the track 101. The mounting bracket 200 is then rotated around the first axis to swap the positions of the two guide wheels 201 relative to the track 101. In other words, the guide wheel 201 that was originally subjected to high pressure and wear from the track 101 is swapped with the guide wheel 201 that was originally subjected to low pressure and wear from the track 101. In subsequent operation, the wear rate and actual lifespan of the two guide wheels 201 tend to be consistent, reducing the frequency of replacement and maintenance.

[0034] The track 101 has an I-shaped cross-section. The wheels 102 are equipped with corresponding drive motors and other structures, enabling them to actively rotate and roll along the upper surface of the track 101. Limiting discs are located at both ends of the wheels 102 to restrict axial movement and prevent them from detaching from the track 101. Two guide wheels 201 have vertical axes and are positioned on either side of the track 101. Both guide wheels 201 rotate accordingly as the wheels 102 roll along the track 101. (See also...) Figure 1 , Figure 3 and Figure 5 The frame 100 is provided with an end frame 202, and the end frame 202 is provided with a longitudinal rail 203. The longitudinal rail 203 is vertically arranged and a sliding plate 204 is slidably mounted on it. The sliding plate 204 is provided with a lifting structure, which may include a first motor 205, a gear 206 and multiple rollers 207 mounted on the sliding plate 204. The longitudinal rail 203 is provided with a rack 208. The first motor 205 drives the gear 206 to rotate. The gear 206 meshes with the rack 208. The rollers 207 roll along the longitudinal rail 203 at the same time, thereby driving the sliding plate 204 to rise and fall along the longitudinal rail 203, that is, the mounting frame 200 moves between the first position and the second position. A second motor 209 is mounted on the mounting plate. A rotating frame 210 is fixed to the output end of the second motor 209. The mounting frame 200 is mounted on the rotating frame 210. The axis of the output end of the second motor 209 is the first axis. When the mounting frame 200 is in the second position, the output end of the second motor 209 drives the rotating frame 210 and the mounting frame 200 to rotate, thereby changing the position of the two guide wheels 201 relative to the track 101. The first motor 205 and the second motor 209 are equipped with corresponding power supplies and controllers to control their start and stop.

[0035] Preferably, the first axis is parallel to the length direction of the track 101, so that the mounting bracket 200 can rotate in the vertical plane to swap the two guide wheels 201.

[0036] Of course, the first axis can also be perpendicular to the length of the track 101, that is, the first axis is a vertical line. When the mounting bracket 200 is in the second position, it rotates in the horizontal plane to swap the two guide wheels 201.

[0037] Preferably, within a preset time, when the difference in the number of rotations of the two guide wheels 201 is greater than a preset value, the mounting bracket 200 moves from the first position to the second position.

[0038] If the difference in the number of rotations of the two guide wheels 201 is greater than the preset value within a preset time, it indicates that the force and wear of the two guide wheels 201 are significantly different, and the frame 100 is running biased towards one side of the track 101. At this time, the control mounting bracket 200 moves from the first position to the second position to swap the positions of the two guide wheels 201 relative to the track 101.

[0039] The mounting frame 200 is equipped with an encoder 211 and a processor. The encoder 211 detects the number of rotations of the guide wheels 201 within a preset time and sends the data to the processor. The processor calculates the difference in the number of rotations of the two guide wheels 201. When this difference is greater than a preset value, the processor controls the first motor 205 to move the mounting frame 200 from a first position to a second position, and controls the second motor 209 to rotate the rotating frame 210 and the mounting frame 200, thereby changing the positions of the two guide wheels 201 relative to the track 101. The encoder 211 can be optical or magnetoresistive, and it uses a non-contact pulse counting method to detect the number of rotations. The structure and working principle of the encoder 211 and the processor are existing technologies and will not be described in detail here.

[0040] The preset time is in seconds (s), and its value ranges from 0 to 60, such as 10s, 20s, or 30s. The preset value is in revolutions, and its value ranges from 0 to 20, such as 5 revolutions, 10 revolutions, or 15 revolutions.

[0041] Preferably, the guide wheel 201 is slidably disposed on the mounting frame 200 along its radial direction, and an elastic element 212 is provided between the guide wheel 201 and the mounting frame 200, so that the guide wheel 201 tends to move closer to the track 101, so as to flexibly connect the guide wheel 201 and the mounting frame 200. When the frame 100 is biased to one side of the track 101, the guide wheel 201 can move along its radial direction, which plays a role in shock absorption and buffering of the guide wheel 201, and at the same time reduces the wear of the guide wheel 201.

[0042] Preferably, the guide wheel 201 is provided with a driving structure, which is used to move the guide wheel 201 along its axial direction when the guide wheel 201 is in rolling contact with the track 101.

[0043] The frame 100 moves along the track 101, causing the guide wheel 201 to roll in contact with the track 101. The drive structure can drive the guide wheel 201 to move back and forth along its axis, thereby continuously switching the contact position between the guide wheel 201 and the side of the track 101. This continuously changes the stress and wear position of the guide wheel 201, avoiding excessive stress and wear in some areas, and making the wear of the guide wheel 201 in its axial direction more uniform. This extends the service life of the guide wheel 201 and reduces the frequency of replacement and maintenance.

[0044] Preferably, the drive structure includes two spiral grooves 213 formed on the outer circumferential surface of the guide wheel 201. The two spiral grooves 213 have the same pitch and opposite directions of rotation. The spiral grooves 213 have a head end and a tail end. The head ends of the two spiral grooves 213 are connected to each other, and the tail ends of the two spiral grooves 213 are connected to each other. The side of the track 101 is located in one of the spiral grooves 213.

[0045] With the cooperation of two opposing, equidistant, and closed spiral grooves 213 on the side of the track 101, the guide wheel 201 can reciprocate along its axial direction when it rolls into contact with the track 101.

[0046] The cross-sections of the helical groove 213 and the side of the track 101 are preferably U-shaped or other shapes that fit each other. The shape and depth of the helical groove 213 can be selected and set. Of the two helical grooves 213, one is left-handed and the other is right-handed. The axes of the two helical grooves 213 coincide with the axis of the guide wheel 201. The pitch, helix angle, and other parameters of the two helical grooves 213 are equal, but the directions of rotation are opposite. That is to say, the two helical grooves 213 are the same except for the opposite directions of rotation. The beginning and end of the two helical grooves 213 are provided with smooth transition grooves to form a continuous double-path groove, similar to the DNA double helix structure.

[0047] Of course, the drive structure can also be other drive structures such as telescopic cylinders set on the mounting bracket 200 to drive the guide wheel 201 to reciprocate along its axial direction.

[0048] Preferably, the mounting bracket 200 is movable between a second position and a third position. In the second position, the two guide wheels 201 are relatively far apart to disengage from the track 101. In the third position, the mounting bracket 200 rotates about a first axis.

[0049] Since the side of the track 101 is stuck in the spiral groove 213 on the guide wheel 201, the two guide wheels 201 need to be controlled to move away from each other to disengage from the track 101. Then, the mounting frame 200 is controlled to move to the third position so that the mounting frame 200 and the two guide wheels 201 are away from the track 101, so as to avoid motion interference between the mounting frame 200 and the track 101 when the mounting frame 200 rotates.

[0050] Among them, see Figure 3 , Figure 5 Two mounting brackets 200 are positioned opposite each other at both ends of a rotating frame 210. The rotating frame 210 is equipped with a hydraulic cylinder or pneumatic cylinder, or other driving component 214, corresponding to the mounting bracket 200, and a corresponding power source and controller for starting and stopping. The mounting bracket 200 has a guide rod, and the rotating frame 210 has a guide groove corresponding to the guide rod. Both the guide rod and the guide groove are horizontal and perpendicular to the length of the track 101. The output end of the driving component 214 can move the corresponding mounting bracket 200, and is guided by the guide rod and guide groove, thereby controlling the two guide wheels 201 to move closer or further apart.

[0051] Preferably, the mounting bracket 200 is provided with a rotating shaft 215 coaxial with the guide wheel 201, the guide wheel 201 is slidably connected to the rotating shaft 215 and can rotate synchronously with the rotating shaft 215.

[0052] Among them, see Figure 5 , Figure 6 The rotating shaft 215 includes round shafts 221 at both ends and a splined shaft 222 in the middle. The guide wheel 201 has a splined hole that mates coaxially with the splined shaft 222, allowing the guide wheel 201 to slide smoothly with the rotating shaft 215. The mounting bracket 200 is C-shaped, with elongated through holes 216 at both ends. The round shaft 221 is inserted through the elongated through holes 216, and a slider 217 slides along its length within the elongated through holes 216. An elastic element 212, a compression spring, is positioned between the slider 217 and the mounting bracket 200, causing the slider 217 to abut against the round shaft 221, thus causing the guide wheel 201 to tend to move closer to the track 101. Alternatively, the round shaft 221 can be rotatably mounted on the slider 217 for better support of the rotating shaft 215 and the guide wheel 201. Within a preset time, the encoder 211 obtains the number of rotations of the guide wheel 201 by directly detecting the number of rotations of the round shaft 221.

[0053] Preferably, the mounting bracket 200 is provided with a locking pin 218 that can slide along the axial direction of the guide wheel 201. The locking pin 218 is located in one of the spiral grooves 213. The mounting bracket 200 is provided with two limiting members 219 for limiting the sliding range of the locking pin 218.

[0054] The mounting bracket 200 has a longitudinal groove 220 along the axial direction of the guide wheel 201. The locking pin 218 is slidably disposed in the longitudinal groove 220. Limiting elements 219 are provided at both the upper and lower parts of the longitudinal groove 220. Initially, the locking pin 218 is located at the upper part of the spiral groove 213. The guide wheel 201 rotates due to rolling contact with the track 101. Under the action of the spiral groove 213, the locking pin 218 moves up and down along the longitudinal groove 220. It can be understood that the role of the locking pin 218 can be ignored during this process, and the locking pin 218 is always located at the upper part of the spiral groove 213. After the mounting bracket 200 rotates around the first axis, the locking pin 218 is located at the lower part of the spiral groove 213. Under the action of its own weight, the guide wheel 201 pushes the locking pin 218 to slide down along the longitudinal groove 220 until the locking pin 218 abuts against the lower limiting member 219. During this process, the guide wheel 201 does not rotate. Then the guide wheel 201 continues to slide down. At this time, the locking pin 218 is stationary. Under the cooperation of the locking pin 218 and the spiral groove 213, the guide wheel 201 rotates until one of the spiral grooves 213 on the guide wheel 201 can cooperate with the side of the track 101. That is, the guide wheel 201 is reset after the mounting bracket 200 rotates around the first axis.

[0055] Preferably, when the locking pin 218 is stationary relative to the mounting bracket 200, the guide wheel 201 can move along its axial direction and rotate.

[0056] The pitch and helix angle of the spiral groove 213 should be large enough to prevent the circumferential rotation or axial movement of the guide wheel 201 from causing self-locking.

[0057] In use, the wheel 102 rolls along the track 101 to move the frame 100 along the track 101, thereby controlling the translation of the entire machine and the lifting device. Simultaneously, the guide wheel 201 rolls in contact with the track 101 to prevent derailment. Furthermore, under the action of two opposing, equidistant, and closed helical grooves 213 on the side of the track 101, the guide wheel 201 reciprocates along its axial direction, continuously switching the contact position between the guide wheel 201 and the side of the track 101. This continuously changes the stress and wear position of the guide wheel 201, avoiding excessive local stress and wear, and making the wear of the guide wheel 201 more uniform along its axial direction. This extends the service life of the guide wheel 201 and reduces the frequency of replacement and maintenance.

[0058] If the difference in the number of rotations of the two guide wheels 201 is greater than the preset value within a preset time, it indicates that the force and wear of the two guide wheels 201 are significantly different. In other words, the frame 100 is running on one side of the track 101, and the pressure and wear rate of the two guide wheels 201 on the track 101 are different. At this time, the control mounting bracket 200 moves from the first position to the second position to swap the positions of the two guide wheels 201 relative to the track 101. Specifically, the output of the drive component 214 drives the corresponding mounting bracket 200 to move, thereby controlling the two guide wheels 201 to move away from each other and disengage from the track 101. At this time, the mounting bracket 200 is in the second position. The first motor 205 is controlled to drive the slide plate 204 to rise along the longitudinal rail 203, and the mounting bracket 200 moves from the second position to the third position. The output of the second motor 209 is controlled to drive the rotating frame 210 and the mounting bracket 200 to rotate around the first axis, thereby swapping the positions of the two guide wheels 201 relative to the track 101. That is, the guide wheel 201 that was originally subjected to high pressure and wear from the track 101 is swapped with the guide wheel 201 that was originally subjected to low pressure and wear from the track 101. In subsequent operation, the wear degree and actual life of the two guide wheels 201 tend to be consistent, reducing the frequency of replacement and maintenance. Then, the mounting bracket 200 is controlled to move from the third position to the second position, and the two guide wheels 201 are controlled to move closer together to contact the track 101 for subsequent operation.

[0059] Figure 4 In the initial operating state, both the locking pin 218 and the track 101 are located at the upper part of the spiral groove 213. The guide wheel 201 rotates in rolling contact with the track 101, and under the action of the spiral groove 213, it drives the locking pin 218 to move up and down along the longitudinal groove 220. During this process, the effect of the locking pin 218 can be ignored, and the locking pin 218 is always located at the upper part of the spiral groove 213. After the mounting bracket 200 rotates around the first axis, as... Figure 7 As shown, the locking pin 218 is located at the lower part of the spiral groove 213. Under its own weight, the guide wheel 201 pushes the locking pin 218 to slide downward along the longitudinal groove 220 until the locking pin 218 abuts against the lower limiting member 219. During this process, the guide wheel 201 does not rotate. Then, the guide wheel 201 continues to slide downward. At this time, the locking pin 218 is stationary. Under the cooperation of the locking pin 218 and the spiral groove 213, the guide wheel 201 rotates until one of the spiral grooves 213 on the guide wheel 201 can cooperate with the side of the track 101, as shown. Figure 8 As shown, the guide wheel 201 is reset after the mounting bracket 200 rotates around the first axis.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A safety protection structure for lifting machinery, characterized in that, The device includes a frame and a track. Wheels are mounted on the frame and roll along the track to move the frame along the track. A mounting bracket is located at the end of the frame, and two guide wheels are rotatably mounted on the mounting bracket, respectively positioned on both sides of the track. The mounting bracket is movable between a first position and a second position. In the first position, the guide wheels are in rolling contact with the track; in the second position, the guide wheels are disengaged from the track. The mounting bracket is also capable of rotating about a first axis to interchange the positions of the two guide wheels relative to the track. The first axis is parallel to the length direction of the track. The guide wheel is provided with a driving structure. When the guide wheel rolls in contact with the track, the driving structure is used to move the guide wheel along its axial direction. The driving structure includes two helical grooves formed on the outer circumferential surface of the guide wheel. The two helical grooves have the same pitch and opposite directions of rotation. The helical grooves have a head end and a tail end. The head ends of the two helical grooves are connected to each other, and the tail ends of the two helical grooves are connected to each other. The side of the track is located in one of the helical grooves. The mounting bracket is provided with a rotating shaft coaxial with the guide wheel. The guide wheel is slidably connected to the rotating shaft and can rotate synchronously with the rotating shaft. The mounting bracket is provided with a locking pin that can slide along the axial direction of the guide wheel. The locking pin is located in one of the spiral grooves. The mounting bracket is provided with two limiting members to limit the sliding range of the locking pin. When the locking pin is stationary relative to the mounting bracket, the guide wheel can move along its axial direction and rotate.

2. The safety protection structure for lifting machinery according to claim 1, characterized in that, Within a preset time period, when the difference in the number of rotations of the two guide wheels is greater than a preset value, the mounting bracket moves from the first position to the second position.

3. The safety protection structure for lifting machinery according to claim 2, characterized in that, The guide wheel is slidably disposed on the mounting bracket along its radial direction, and an elastic element is provided between the guide wheel and the mounting bracket, so that the guide wheel tends to move closer to the track.

4. The safety protection structure for lifting machinery according to claim 3, characterized in that, The mounting bracket is movable between the second position and the third position. When in the second position, the two guide wheels are relatively far apart to disengage from the track. When in the third position, the mounting bracket rotates about the first axis.

5. The safety protection structure for lifting machinery according to claim 4, characterized in that, Two mounting brackets are provided and slidably disposed at the ends of the vehicle frame. Each mounting bracket is provided with a guide wheel. A driving component is provided at the end of the vehicle frame to move the two mounting brackets relative to each other.

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