Safety protection device and method of crane

Abstract

The invention relates to the technical field of safety protection of cranes, and discloses a safety protection device and method of a crane, and the safety protection device of the crane comprises a frame body; the vehicle further comprises a vehicle frame body. A control drive group; the driving wheel set comprises two fixing shafts, the exteriors of the two fixing shafts are rotationally connected with a driving wheel A and a driving wheel B correspondingly, the exteriors of the two fixing shafts are rotationally connected with rotating gears correspondingly, and protective parts are arranged on the side faces of the driving wheel A and the driving wheel B correspondingly; a trapezoidal abutting block; and a driven wheel group. An electronic protection mode is used as a main mode, a mechanical protection mode is used as an auxiliary mode, electronic protection is triggered earlier than mechanical protection, so that the triggering frequency of the mechanical protection is reduced, the service life of a mechanical structure is prolonged, and the mechanical protection can stop moving of the moving trolley through mechanical triggering and prevent the moving trolley from colliding with a rail beam in an over-position mode. The device is especially suitable for severe environments with much coal mine dust, moisture and strong electromagnetic interference.

Description

Technical Field

[0001] This invention relates to the field of crane safety protection technology, and more specifically, to a crane safety protection device and method. Background Technology

[0002] With rapid economic growth and continued urbanization, cranes, with their excellent mobility, multi-functionality, ease of operation, and cost-effectiveness, have stood out in numerous coal mine projects, becoming an indispensable and important lifting equipment on construction sites. However, the crane operating environment is complex and presents many safety hazards. Implementing safety protection measures to prevent overloading, over-positioning, derailment, and falls is the bottom line for ensuring the safety of coal mine production.

[0003] Existing gantry cranes mainly consist of a support frame, a moving trolley, a lifting mechanism, and an electrical control system. The moving trolley is mainly composed of a frame, a control drive group, a drive wheel group, and a driven wheel group. The control drive group rotates the drive wheel group, causing the drive wheel group and the driven wheel group to rotate together and drive the entire structure to move on the track beam in the support frame, thus moving the lifted object. Furthermore, the moving trolley is protected against overtravel by protective sensors (electronic travel limit sensors installed at both ends of the track beam).

[0004] In the actual operation of the aforementioned crane, although the mobile trolley can be protected against overtravel by electronic travel limit sensors, coal mine production is not in an ideal environment. The harsh environment of coal mines, with its high dust, humidity, and strong electromagnetic interference, can easily lead to contamination, moisture-induced short circuits, signal interference, misjudgment, or failure of the limit sensors. In other words, relying solely on electronic overtravel protection for the mobile trolley poses certain safety risks. Summary of the Invention

[0005] This invention provides a safety protection device and method for cranes, solving the technical problem that the electronic "over-positioning prevention" method of mobile trolleys is prone to safety hazards in the harsh environment of coal mines with high dust, humidity and strong electromagnetic interference.

[0006] This invention provides a safety protection device for a crane, including a track beam;

[0007] It also includes the vehicle frame, which is set outside the track beam;

[0008] The control drive assembly is mounted on the outside of the vehicle frame.

[0009] An active wheel assembly is located inside the frame. The active wheel assembly includes two fixed shafts fixedly connected to the inside of the frame. Active wheel A and active wheel B, located inside the track beam, are rotatably connected to the outside of the two fixed shafts respectively. Rotating gears are rotatably connected to the outside of both fixed shafts. Protective components are provided on the sides of active wheel A and active wheel B.

[0010] Trapezoidal blocks are symmetrically fixed to both ends of the track beam via connecting rods and are used to trigger the protective components;

[0011] The driven wheel set is located inside the frame and is positioned opposite the driving wheel set.

[0012] Preferably, the vehicle frame includes a main frame and a secondary frame, and two mounting rods are provided between the main frame and the secondary frame.

[0013] Preferably, the control drive group includes a drive motor and a gearbox mounted on the outside of the main frame, and the output end of the drive motor is connected to a drive gear located on the inside of the main frame through the gearbox.

[0014] Preferably, both fixed shafts are fixedly connected to the inner side of the main frame, and the two rotating gears are respectively meshed and connected to both sides of the drive gear.

[0015] Preferably, the protective component includes a protective ring fixed to the side of the drive wheel A or the drive wheel B. The outer circumferential opening of the protective ring is provided, and a ratchet pawl is rotatably connected inside the opening. A spring A is fixedly connected between the opening and the ratchet pawl. A ratchet ring is movably sleeved on the outside of the protective ring, and a connector is provided on the outside of the ratchet ring.

[0016] Preferably, the tooth direction of the ratchet pawl and ratchet ring outside the driving wheel A is opposite to that of the ratchet pawl and ratchet ring outside the driving wheel B.

[0017] Preferably, an annular groove is provided on the inner side of the main frame. The connecting member includes two sliding rods that slide through the main frame and two rotating rods that are fixedly connected to the outside of the ratchet ring. A spring B that is fixedly connected to the main frame is sleeved on the outside of each of the two sliding rods. A connecting plate located on the outside of the main frame is fixedly connected to one end of each of the two sliding rods. A circular rail is fixedly connected to the other end of each of the two sliding rods. The two rotating rods slide through the corresponding rotating gears and are rotatably connected to the circular rail. A trapezoidal contact block is fixedly connected to the side of the connecting plate near the main frame.

[0018] Preferably, the driven wheelset includes two driven wheels rotatably connected to the inside of the frame and located inside the track beam.

[0019] Preferably, the ratchet ring has an oil reservoir inside, and the inner circumferential side of the ratchet ring has a through hole group communicating with the oil reservoir. A lubricating ball group is rotatably connected inside the through hole group.

[0020] A safety protection method for a crane includes the following steps:

[0021] S1. Electronic protection: When the mobile trolley, which consists of a frame, control drive group, driving wheel group and driven wheel group, approaches the overpass area, it can be detected by electronic travel limit sensors installed at both ends of the track beam. The control drive group can be shut down through the electrical control part to stop the movement of the mobile trolley.

[0022] S2. Mechanical protection: When the electronic protection fails and the moving trolley approaches the over-interval area, the trapezoidal contact block in the connector will be squeezed by the trapezoidal stop block on the same side, causing the connector to drive the ratchet ring to move and no longer engage with the ratchet pawl outside the drive wheel A or drive wheel B. That is, the rotating gear continues to rotate but no longer drives the drive wheel A or drive wheel B to rotate and move. The drive wheel A or drive wheel B loses its rotational force, and the driven wheel set no longer rotates, stopping the movement of the moving trolley.

[0023] S3. Lubrication Assistance: When the moving trolley moves too far and stops due to mechanical protection, the rotation of the ratchet ring will repeatedly squeeze the ratchet pawl on its inner side. The lubricating ball group that rotates to the lowest position will pick up the lubricating oil inside the oil reservoir and come into contact with the ratchet pawl as the ratchet ring rotates. The lubricating ball group that picks up the lubricating oil can roll into contact with the ratchet pawl, reducing the friction between the ratchet ring and its inner ratchet pawl.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. This invention primarily employs an electronic "over-alignment" safety protection method. When a mobile trolley, consisting of a frame, control drive group, active wheel group, and driven wheel group, approaches an over-alignment area, electronic travel limit sensors installed at both ends of the track beam detect this and can shut down the control drive group via the electrical control section, thereby stopping the movement of the mobile trolley and preventing it from over-aligning and colliding with the track beam. Furthermore, the electronic "over-alignment" triggers earlier than the mechanical "over-alignment" to reduce the triggering frequency of the mechanical "over-alignment" and extend the service life of the mechanical structure.

[0026] 2. This invention uses a mechanical "over-positioning" safety protection method as a supplement. When the electronic "over-positioning" malfunctions and the moving trolley approaches the over-positioning area, the trapezoidal contact block will be squeezed by the trapezoidal stop block on the same side, causing the connecting part to drive the ratchet ring to move and no longer engage with the ratchet pawl. That is, the rotating gear continues to rotate but no longer drives the drive wheel A or drive wheel B to rotate and move, thereby stopping the movement of the moving trolley and avoiding the moving trolley from over-positioning and hitting the track beam. It is especially suitable for harsh environments with a lot of dust, humidity and strong electromagnetic interference in coal mines.

[0027] 3. In this invention: when the moving trolley moves too far and stops due to mechanical protection, the rotation of the ratchet ring will repeatedly squeeze the ratchet pawl on its inner side. The lubricating ball assembly that rotates to the lowest position will pick up the lubricating oil inside the oil storage cavity and come into contact with the ratchet pawl as the ratchet ring rotates. The lubricating ball assembly that picks up the lubricating oil can roll into contact with the ratchet pawl, reducing the friction between the ratchet ring and its inner ratchet pawl, making the relative rotation between the ratchet ring and the protective ring smoother, thereby ensuring the stability of the mechanical "over-positioning prevention" operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the vehicle frame structure in this invention;

[0030] Figure 3 This is a schematic diagram of the first structure of the main frame in this invention;

[0031] Figure 4 for Figure 3 A schematic diagram of the split structure;

[0032] Figure 5 This is a schematic diagram of the protective component in this invention;

[0033] Figure 6 This is a schematic diagram of the connector structure in this invention.

[0034] Figure 7 This is a schematic diagram of the internal structure of the ratchet ring in this invention;

[0035] Figure 8 This is a schematic diagram of the second structure of the main frame in this invention;

[0036] Figure 9 yes Figure 8 A schematic diagram of the AA-line cross-sectional structure.

[0037] In the diagram: 100, track beam; 200, frame body; 210, main frame; 220, driven frame; 300, control drive assembly; 310, drive gear; 400, drive wheel assembly; 410, fixed shaft; 420, drive wheel A; 430, drive wheel B; 440, rotating gear; 450, protective ring; 451, ratchet pawl; 452, spring A; 460, ratchet ring; 461, oil reservoir; 462, lubricating ball assembly; 470, sliding rod; 471, rotating rod; 472, spring B; 473, connecting plate; 474, circular rail; 475, trapezoidal contact block; 500, trapezoidal stop block; 600, driven wheel assembly; 610, driven wheel. Detailed Implementation

[0038] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.

[0039] like Figure 1 As shown, this embodiment provides a safety protection device for a crane, including a track beam 100. Electronic travel limit sensors (not shown in the figure) are installed at both ends of the track beam 100 to provide electronic "over-positioning" safety protection for the moving trolley. The gantry cranes in the prior art are mainly composed of a support frame, a moving trolley, a lifting mechanism, and an electrical control part. The safety protection device provided in this embodiment includes a moving trolley, components on the moving trolley, and trapezoidal blocks 500 symmetrically fixed at both ends of the track beam 100. The safety protection device provided in this embodiment needs to be used in conjunction with the electronic travel limit sensors installed at both ends of the track beam 100.

[0040] like Figure 2 As shown, the system also includes a frame 200, located outside the track beam 100; a control drive assembly 300, installed on the outside of the frame 200; an active wheel assembly 400, located inside the frame 200; trapezoidal abutments 500, symmetrically fixed to both ends of the track beam 100 via connecting rods and used to trigger the protective components; and a driven wheel assembly 600, located inside the frame 200 and opposite to the active wheel assembly 400. The driven wheel assembly 600 includes two driven wheels 610 rotatably connected to the inside of the frame 220 and located inside the track beam 100. By controlling the drive assembly 300, the active wheel assembly 400 and the driven wheel assembly 600 drive the entire system to move on the track beam 100, thereby realizing the movement of the lifted object.

[0041] The frame body 200 includes a main frame 210 and a secondary frame 220. Two mounting rods are provided between the main frame 210 and the secondary frame 220. The two mounting rods are detachable and used to install the hoist motor in the crane. An annular groove is provided on the inner side of the main frame 210. The annular groove is used for the passage of the circular rail 474 in the following connector.

[0042] The control drive group 300 includes a drive motor and a gearbox mounted on the outside of the main frame 210. The output end of the drive motor is connected to a drive gear 310 located inside the main frame 210 through the gearbox. That is, the drive motor is decelerated by the gearbox, and then the drive gear 310 is rotated.

[0043] Among them, such as Figure 3 - Figure 4 and Figure 8 As shown, the active wheel assembly 400 includes two fixed shafts 410 fixedly connected to the inner side of the frame body 200. Both fixed shafts 410 are fixedly connected to the inner side of the main frame 210. Active wheels A420 and B430 located inside the track beam 100 are rotatably connected to the outside of the two fixed shafts 410, respectively. Rotating gears 440 are rotatably connected to the outside of the two fixed shafts 410. The two rotating gears 440 are meshed with the two sides of the drive gear 310, respectively. The two rotating gears 440 are driven by the drive gear 310 and keep rotating synchronously. Protective parts are provided on the sides of the active wheels A420 and B430.

[0044] Among them, such as Figure 5 As shown, the protective component includes a protective ring 450 fixed to the side of the drive wheel A420 or drive wheel B430. The protective ring 450 has an opening circumferentially on its outer side. A ratchet pawl 451 is rotatably connected inside the opening. A spring A452 is fixedly connected between the opening and the ratchet pawl 451. A ratchet ring 460 is movably fitted onto the outer side of the protective ring 450. The tooth direction of the ratchet pawl 451 and ratchet ring 460 on the outer side of the drive wheel A420 is opposite to that of the ratchet pawl 451 and ratchet ring 460 on the outer side of the drive wheel B430. Figure 9 As shown, when the ratchet ring 460 on the outside of the drive wheel A420 rotates clockwise, it can drive the drive wheel A420 to rotate clockwise through the ratchet pawl 451 on its inner side. When the ratchet ring 460 on the outside of the drive wheel B430 rotates counterclockwise, it can drive the drive wheel B430 to rotate counterclockwise through the ratchet pawl 451 on its inner side. A connecting member is provided on the outside of the ratchet ring 460.

[0045] Among them, such as Figure 6As shown, the connector includes two sliding rods 470 that slide through the main frame 210 and two rotating rods 471 that are fixedly connected to the outside of the ratchet ring 460. The outside of each of the two sliding rods 470 is fitted with a spring B472 that is fixedly connected to the main frame 210. One end of each of the two sliding rods 470 is fixedly connected to a connecting plate 473 located outside the main frame 210, and the other end of each of the two sliding rods 470 is fixedly connected to a circular rail 474. That is, the connecting plate 473, the circular rail 474 and the two sliding rods 470 slide synchronously. The two rotating rods 471 slide through the corresponding rotating gears 440 and are rotatably connected to the connecting plate 474. That is, the ratchet ring 460, the two rotating rods 471 and the corresponding rotating gears 440 rotate synchronously. A trapezoidal contact block 475 is fixedly connected to the side of the connecting plate 473 near the main frame 210.

[0046] The trapezoidal abutment 500 and trapezoidal contact 475, which are close to each other, can compress the trapezoidal contact 475 and move it away from the main frame 210. Figure 1 and Figure 9 Taking the orientation of the components as an example, if the two rotating gears 440 rotate clockwise, the entire device will move to the right and approach the right end of the track beam 100. The trapezoidal contact block 475 on the right side will then approach the trapezoidal abutment block 500 on the right side and be squeezed by it. The squeezed trapezoidal contact block 475 will then drive the ratchet ring 460 to move through the connecting plate 473, the two sliding rods 470, and the circular rail 474, so that the ratchet ring 460 is no longer engaged with the ratchet pawl 451 outside the drive wheel A420, that is, the rotating gear 440 on the right side continues to rotate clockwise. The clockwise rotation stops driving the drive wheel A420. If the two rotating gears 440 rotate counterclockwise, the entire device moves to the left and approaches the left end of the track beam 100. The trapezoidal contact block 475 on the left side will approach the trapezoidal stop block 500 on the left side and be squeezed by it. Similarly, the ratchet ring 460 will no longer engage with the ratchet pawl 451 outside the drive wheel B430. That is, the rotating gear 440 on the left side continues to rotate counterclockwise but stops driving the drive wheel B430, so as to prevent the moving trolley device from continuing to move and hitting the track beam 100.

[0047] In addition, such as Figure 7As shown, the ratchet ring 460 has an oil reservoir 461 inside, and an addition port communicating with the oil reservoir 461 is provided on the outside of the ratchet ring 460. The addition port is equipped with a sealing element, and lubricating oil can be added into the oil reservoir 461 through the addition port. The inner circumferential side of the ratchet ring 460 has a through hole assembly communicating with the oil reservoir 461. A lubricating ball assembly 462 is rotatably connected inside the through hole assembly. There is a gap between the lubricating ball assembly 462 and the through hole assembly. The presence of the lubricating ball assembly 462 can prevent the ratchet pawl 451 from sliding between the ratchet ring 460 and the ratchet ring 460. The dynamic contact is transformed into rolling contact. By storing an appropriate amount of lubricating oil inside the oil reservoir 461, the lubricating oil inside the oil reservoir 461 is always at the lowest position due to its own gravity during the rotation of the ratchet ring 460. This allows the lubricating ball assembly 462, which rotates to the bottom, to pick up the lubricating oil and lubricate the ratchet pawl 451 through rolling contact. This makes the relative rotation between the ratchet ring 460 and the protective ring 450 (the protective ring 450 is stationary while the ratchet ring 460 rotates, which is called relative rotation) smoother.

[0048] The specific working principle of this implementation is as follows: When the crane is moving normally, the moving trolley in this implementation (composed of a frame body 200, a control drive group 300, an active wheel group 400, and a driven wheel group 600) moves normally along the track beam 100.

[0049] by Figure 1 and Figure 9 Taking the orientation of each component as an example, if the moving trolley needs to move to the right and approach the right end of the track beam 100, the drive motor in the control drive group 300 is activated through the electrical control section, causing the drive gear 310 to rotate counterclockwise, which in turn causes the two rotating gears 440 to rotate clockwise. The right rotating gear 440 then drives the right ratchet ring 460 to rotate clockwise through the two rotating rods 471. The clockwise rotation of the right ratchet ring 460 then drives the right protective ring 450 to rotate clockwise through the inner ratchet pawl 451, causing the drive wheel A420 to rotate clockwise and move to the right on the track beam 100. Similarly, the left rotating gear 440 is driven by two rotating rods 471. The lever 471 drives the left ratchet ring 460 to rotate clockwise, but the clockwise rotation of the left ratchet ring 460 does not affect the drive wheel B430. The drive wheel A420 can drive the drive wheel B430 to move to the right on the track beam 100, so that the drive wheel B430 rotates clockwise due to the friction of the track beam 100. The clockwise rotating drive wheel B430 can drive the left ratchet ring 460 to rotate clockwise through the ratchet pawl 451 on its outer side. That is, when the moving trolley moves to the right, the drive wheel group 400 and the driven wheel group 600 can rotate together and drive the whole to move on the track beam 100, thus realizing the movement of the lifted object.

[0050] by Figure 1 and Figure 9 Taking the orientation of each component as an example, if the moving trolley needs to move to the left and approach the left end of the track beam 100, similarly, the drive motor in the control drive group 300 is activated through the electrical control section, causing the drive gear 310 to rotate clockwise, causing the two rotating gears 440 to rotate counterclockwise, causing the left ratchet ring 460 to rotate counterclockwise, which in turn drives the left protective ring 450 to rotate counterclockwise through the inner ratchet pawl 451, causing the drive wheel B430 to rotate counterclockwise and move to the left on the track beam 100, while the right ratchet ring 460 rotates counterclockwise without affecting the movement of the trolley. When the drive wheel A420 moves to the left on the track beam 100, the drive wheel B430 can drive the drive wheel A420 to rotate counterclockwise due to the friction of the track beam 100. The counterclockwise rotating drive wheel B430 can drive the left ratchet ring 460 to rotate counterclockwise through the ratchet pawl 451 on its outer side. That is, when the trolley moves to the left, the drive wheel group 400 and the driven wheel group 600 can rotate together and drive the whole to move on the track beam 100, thus realizing the movement of the lifted object.

[0051] In implementing over-positioning safety protection, this method primarily uses electronic over-positioning protection, supplemented by mechanical over-positioning protection. This dual design enhances safety. The electronic over-positioning protection triggers earlier than the mechanical over-positioning protection to reduce the triggering frequency of the mechanical over-positioning protection and extend the service life of the mechanical structure. When the electronic over-positioning protection fails, the mechanical over-positioning protection can stop the movement of the trolley through mechanical triggering, preventing the trolley from over-positioning and colliding with the track beam 100. This method is particularly suitable for harsh environments in coal mines with high dust levels, humidity, and strong electromagnetic interference.

[0052] The electronic "over-positioning" safety protection process: When the moving trolley approaches the over-positioning area (left or right area), it is sensed by the electronic travel limit sensors installed at both ends of the track beam (100). The control drive group 300 can be shut down through the electrical control part to stop the movement of the moving trolley and prevent the moving trolley from over-positioning and hitting the track beam 100.

[0053] The mechanical "over-alignment" safety protection process: When the electronic "over-alignment" malfunctions and the moving trolley approaches the over-alignment area, if the moving trolley moves to the right and over-aligns, the trapezoidal contact block 475 on the right side will be squeezed by the trapezoidal stop block 500 on the right side. This causes the trapezoidal contact block 475 to drive the ratchet ring 460 to move through the connecting plate 473, the two sliding rods 470, the circular rail 474, and the two rotating rods 471. This causes the ratchet ring 460 to no longer engage with the ratchet pawl 451 on the outside of the drive wheel A420. That is, the rotating gear 440 on the right side continues to rotate clockwise but no longer drives the drive wheel A420 to rotate and move. The drive wheel loses its rotational force and the drive wheel... B430 and the driven wheel set 600 will also stop rotating, thus stopping the movement of the trolley. If the trolley moves too far to the left, the trapezoidal contact block 475 on the left will be squeezed by the trapezoidal stop block 500 on the left. Similarly, the ratchet ring 460 will no longer engage with the ratchet pawl 451 on the outside of the driving wheel B430. That is, the rotating gear 440 on the left will continue to rotate counterclockwise but will no longer drive the driving wheel B430 to rotate and move. Without the driving force of the driving wheel B430, the driving wheel A420 and the driven wheel set 600 will also stop rotating, thus stopping the movement of the trolley and preventing the trolley from continuing to move and hitting the track beam 100 due to overshoot.

[0054] During the process of the mobile trolley moving to the right and stopping by mechanical "overshoot", the clockwise rotation of the left ratchet ring 460 will repeatedly squeeze the ratchet pawl 451 on its inner side. Since the lubricating oil inside the oil reservoir 461 is always at the lowest position due to its own gravity, the lubricating ball assembly 462, which rotates to the lowest position, will pick up the lubricating oil inside the oil reservoir 461 and come into contact with the ratchet pawl 451 as the left ratchet ring 460 rotates clockwise. The rolling contact between the lubricating ball assembly 462, which has picked up the lubricating oil, and the ratchet pawl 451 can reduce the friction between the left ratchet ring 460 and its inner ratchet pawl 451.

[0055] Similarly, during the process where the moving trolley moves too far to the left and stops moving due to mechanical "over-alignment prevention", the counterclockwise rotation of the right ratchet ring 460 will repeatedly squeeze the ratchet pawl 451 on its inner side, causing the lubricating ball assembly 462, which is coated with lubricating oil, to roll into contact with the ratchet pawl 451. This reduces the friction between the right ratchet ring 460 and its inner ratchet pawl 451, making the relative rotation between the ratchet ring 460 and the protective ring 450 (the protective ring 450 is stationary while the ratchet ring 460 rotates, which is called relative rotation) smoother, thereby ensuring the stability of the mechanical "over-alignment prevention" operation.

[0056] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A safety protection device for a crane, comprising a frame body (200), characterized in that, Also includes: The frame body (200) is located outside the track crossbeam (100); The control drive assembly (300) is mounted on the outside of the chassis (200); An active wheel assembly (400) is disposed on the inner side of the frame body (200). The active wheel assembly (400) includes two fixed shafts (410) fixedly connected to the inner side of the frame body (200). The two fixed shafts (410) are respectively rotatably connected to an active wheel A (420) and an active wheel B (430) located inside the track beam (100). Rotating gears (440) are rotatably connected to the outer side of each of the two fixed shafts (410). Protective parts are provided on the sides of the active wheel A (420) and the active wheel B (430). Trapezoidal blocks (500) are symmetrically fixed to both ends of the track beam (100) via connecting rods and are used to trigger the protective components; The driven wheel set (600) is located inside the frame body (200) and is positioned opposite to the driving wheel set (400).

2. The safety protection device for a crane according to claim 1, characterized in that, The vehicle frame (200) includes a main frame (210) and a secondary frame (220) with opposite sides, and two mounting rods are provided between the main frame (210) and the secondary frame (220).

3. A safety protection device for a crane according to claim 2, characterized in that, The control drive group (300) includes a drive motor and a gearbox mounted on the outside of the main frame (210), and the output end of the drive motor is connected to a drive gear (310) located inside the main frame (210) through the gearbox.

4. A safety protection device for a crane according to claim 3, characterized in that, Both of the fixed shafts (410) are fixedly connected to the inner side of the main frame (210), and the two rotating gears (440) are respectively meshed and connected to both sides of the drive gear (310).

5. A safety protection device for a crane according to claim 4, characterized in that, The protective component includes a protective ring (450) fixed to the side of the drive wheel A (420) or the drive wheel B (430). The protective ring (450) has an opening in the outer circumference. A ratchet pawl (451) is rotatably connected inside the opening. A spring A (452) is fixedly connected between the opening and the ratchet pawl (451). A ratchet ring (460) is movably sleeved on the outside of the protective ring (450). A connector is provided on the outside of the ratchet ring (460).

6. A safety protection device for a crane according to claim 5, characterized in that, The tooth direction of the ratchet pawl (451) and ratchet ring (460) outside the active wheel A (420) is opposite to that of the ratchet pawl (451) and ratchet ring (460) outside the active wheel B (430).

7. A safety protection device for a crane according to claim 6, characterized in that, The inner side of the main frame (210) is provided with an annular groove. The connecting member includes two sliding rods (470) that slide through the main frame (210) and two rotating rods (471) that are fixedly connected to the outside of the ratchet ring (460). The two sliding rods (470) are each fitted with a spring B (472) that is fixedly connected to the main frame (210). One end of the two sliding rods (470) is fixedly connected to a connecting plate (473) located on the outside of the main frame (210). The other end of the two sliding rods (470) is fixedly connected to a circular rail (474). The two rotating rods (471) slide through the corresponding rotating gear (440) and are rotatably connected to the connecting plate (474). The side of the connecting plate (473) near the main frame (210) is fixedly connected to a trapezoidal contact block (475).

8. A safety protection device for a crane according to claim 7, characterized in that, The driven wheelset (600) includes two driven wheels (610) rotatably connected to the inside of the frame (220) and located inside the track beam (100).

9. A safety protection device for a crane according to claim 8, characterized in that, The ratchet ring (460) has an oil reservoir (461) inside. The inner circumferential side of the ratchet ring (460) has a through hole group communicating with the oil reservoir (461). A lubricating ball group (462) is rotatably connected inside the through hole group.

10. A safety protection method for a crane, applied to a safety protection device for a crane as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Electronic protection: When the mobile trolley, which consists of a frame body (200), a control drive group (300), an active wheel group (400), and a driven wheel group (600), approaches the overpass area, it can be stopped by closing the control drive group (300) through the electronic travel limit sensors installed at both ends of the track beam (100) and stopping the movement of the mobile trolley by the electrical control part. S2, Mechanical protection: When the electronic protection fails and the moving trolley approaches the over-position area, the trapezoidal contact block (475) in the connector will be squeezed by the trapezoidal stop block (500) on the same side, so that the connector drives the ratchet ring (460) to move and no longer engage with the ratchet pawl (451) outside the active wheel A (420) or active wheel B (430). That is, the rotating gear (440) continues to rotate but no longer drives the active wheel A (420) or active wheel B (430) to rotate and move. The active wheel A (420) or active wheel B (430) loses the rotation and movement force, and the driven wheel set (600) no longer rotates, stopping the movement of the moving trolley; S3, Lubrication Assistance: When the moving trolley moves too far and stops due to mechanical protection, the rotation of the ratchet ring (460) will repeatedly squeeze the ratchet pawl (451) on its inner side. The lubricating ball assembly (462) rotated to the lowest position will pick up the lubricating oil inside the oil reservoir (461) and come into contact with the ratchet pawl (451) as the ratchet ring (460) rotates. The lubricating ball assembly (462) with the lubricating oil can roll into contact with the ratchet pawl (451), reducing the friction between the ratchet ring (460) and its inner ratchet pawl (451).

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