A safety protection device for rail-mounted cranes
By incorporating a flexible pawl structure and a fall protection structure into the rail-mounted crane, the problems of drive shaft reversal and hook swaying and falling are solved, achieving safety protection in the event of power failure and swaying, and improving operational safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA POWER CONSTR HUBEI ELECTRIC POWER CONSTR CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-26
AI Technical Summary
Existing rail-mounted cranes are prone to reverse rotation of the drive motor shaft during power outages, causing heavy objects to fall. Furthermore, heavy objects are prone to swaying and falling during hoisting, resulting in poor safety.
An elastic pawl structure is installed between the electric hoist and the running vehicle to lock the drive shaft and prevent it from reversing; an anti-fall structure is installed between the hook and the wire rope, and the hook is automatically locked by a gravity drive component and a baffle to prevent the heavy object from falling.
It effectively prevents the drive shaft from reversing and the hook from swaying and falling due to power outages, improves the safety performance of rail-mounted cranes, and ensures that heavy objects do not fall under various circumstances.
Smart Images
Figure CN224279565U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lifting equipment, and more specifically, to a safety protection device for a rail-mounted crane. Background Technology
[0002] Rail-mounted cranes (such as bridge cranes and gantry cranes) are core material handling equipment in the industrial field, and their design must take into account structural strength, operational stability and intelligent control.
[0003] When existing rail-mounted cranes are in use, the running car body has its own drive unit, which is electrically connected to an external controller. The drive motor drives the electric hoist to run, thereby controlling the up and down movement of the hook to hang the load on the hook. The external controller then drives the running car body to move left and right to transport the load to the designated location.
[0004] However, during the process of lifting heavy objects by driving the hook with the drive motor, a sudden power outage may cause the drive motor transmission shaft to reverse, resulting in the heavy object falling; or during the lifting process, the heavy object is very likely to fall due to shaking, resulting in poor safety. Utility Model Content
[0005] The purpose of this utility model is to provide a safety protection device for a rail-mounted crane, which can lock the electric hoist during a power outage to prevent the drive shaft from reversing and causing the load to fall; and can also improve the safety protection performance of the hook.
[0006] The embodiments of this utility model are implemented as follows:
[0007] This application provides a safety protection device for a rail-mounted crane. The rail-mounted crane includes a traveling body, an electric hoist, and a hook. The traveling body is slidably mounted on the crane beam. The electric hoist is connected to the bottom of the traveling body. The hook is connected to the electric hoist via a wire rope. A mounting plate is provided between the electric hoist and the traveling body. The mounting plate is provided with an elastic pawl structure, which is connected to the drive shaft of the electric hoist.
[0008] A fall protection structure is provided between the hook and the wire rope. The fall protection structure includes a safety seat, a baffle, a slider, and a gravity drive assembly. The safety seat has a receiving groove. The slider is slidably disposed in the receiving groove and elastically connected to its bottom. The hook is connected to the bottom of the slider. The gravity drive assembly is rotatably disposed in the receiving groove and is drivenly connected to the slider. One end of the baffle is connected to the gravity drive assembly, and the other end of the baffle has a limiting part that engages with a limiting groove at the end of the hook.
[0009] When the hook suspends a heavy object, it causes the slider to move downward. The slider drives the baffle to rotate through the gravity drive assembly, so that its limiting part engages with the limiting groove.
[0010] Furthermore, based on the aforementioned scheme, the elastic pawl structure includes a ratchet, a pawl, and a first spring. The ratchet is sleeved on the end of the drive shaft; the bottom end of the pawl engages with the ratchet, the top end of the pawl extends into the mounting plate and is connected to the mounting plate through the first spring, and the sidewall of the pawl is slidably connected to the mounting plate.
[0011] Furthermore, based on the aforementioned scheme, the gravity drive assembly includes a rack, a gear, and a rotating shaft. The two ends of the rotating shaft are rotatably connected to the inner wall of the receiving groove. The gear is sleeved on the rotating shaft. The rack is fixedly connected to the slider and is opposite to the gear, so that it can mesh with the gear. One end of the baffle is sleeved on the rotating shaft, and the other end of the baffle extends outward through the bottom of the safety seat. The bottom of the safety seat has a notch for the baffle to rotate.
[0012] Furthermore, based on the aforementioned scheme, both the hook and the baffle are inserted through the center of the safety seat; the end of the baffle is sleeved on the center of the rotating shaft; and the gear is sleeved on the rotating shaft near its end.
[0013] Furthermore, based on the aforementioned scheme, the baffle is arc-shaped and recessed towards the inside of the hook.
[0014] Furthermore, based on the aforementioned scheme, the limiting part is located at the end of the baffle away from the safety seat, and the limiting part is hook-shaped; the limiting groove is inclined, and its opening faces the bottom of the hook.
[0015] Furthermore, based on the aforementioned solution, the slider includes a sliding part and a connecting part. The sliding part is slidably connected to the inner wall of the receiving groove, and the bottom of the sliding part is connected to the bottom of the safety seat through a plurality of second springs. The connecting part is movably inserted through the bottom of the receiving groove and integrally connected with the sliding part. The hook is connected to the bottom of the connecting part.
[0016] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:
[0017] This application provides an installation plate between the electric hoist and the running vehicle body, with an elastic pawl mechanism on the installation plate. This mechanism is connected to the drive shaft of the electric hoist via the elastic pawl structure, allowing the drive shaft to be locked during power outages to prevent reverse rotation and the falling of the load. Furthermore, an anti-fall structure is installed between the hook and the wire rope, including a safety seat, a baffle, a slider, and a gravity drive assembly. The safety seat has a receiving groove; the slider is slidably positioned within the receiving groove and elastically connected to its bottom, allowing it to slide up and down within the safety seat. The hook is connected to the bottom of the slider, and when the hook suspends a load, it moves the slider downwards. After the load is removed, the slider automatically resets under elastic action. The gravity drive assembly is rotatably mounted in the receiving groove and is connected to the slider via transmission. One end of the baffle is connected to the gravity drive assembly, and the other end of the baffle is provided with a limiting part. The limiting part is matched with the limiting groove opened at the end of the hook. The slider can rotate by the gravity drive assembly when it moves up and down, so that the limiting part is matched with the limiting groove, and the baffle closes the hook, improving its safety performance and preventing it from shaking and falling. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall structure of the safety protection device for a rail-mounted crane according to an embodiment of this utility model;
[0020] Figure 2 This is a front view of the elastic ratchet structure according to an embodiment of the present invention;
[0021] Figure 3 This is a side view of the elastic ratchet structure according to an embodiment of the present invention;
[0022] Figure 4 This is a front sectional view of the fall protection structure according to an embodiment of this utility model;
[0023] Figure 5 This is a side sectional view of the fall protection structure according to an embodiment of the present invention.
[0024] Icons: 1-Running vehicle body, 2-Electric hoist, 3-Hook, 31-Limiting groove, 4-Wire rope, 5-Mounting plate, 6-Elastic pawl structure, 61-Ratchet, 62-Pawl, 63-First spring, 7-Anti-fall structure, 71-Safety seat, 711-Receiving groove, 72-Baffle, 721-Limiting part, 73-Slider, 731-Sliding part, 732-Connecting part, 74-Rack, 75-Gear, 76-Shaft, 77-Second spring. Detailed Implementation
[0025] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0026] Please refer to Figures 1-5 This embodiment provides a safety protection device for a rail-mounted crane. The rail-mounted crane includes a traveling body 1, an electric hoist 2, and a hook 3. The traveling body 1 is slidably mounted on the crane beam. The electric hoist 2 is connected to the bottom of the traveling body 1. The hook 3 is connected to the electric hoist 2 via a wire rope 4. An mounting plate 5 is provided between the electric hoist 2 and the traveling body 1. The mounting plate 5 is provided with an elastic pawl structure 6, which is connected to the drive shaft of the electric hoist 2.
[0027] A fall protection structure 7 is provided between the hook 3 and the wire rope 4. The fall protection structure 7 includes a safety seat 71, a baffle 72, a slider 73, and a gravity drive assembly. The safety seat 71 is provided with a receiving groove 711. The slider 73 is slidably disposed in the receiving groove 711 and elastically connected to its bottom. The hook 3 is connected to the bottom of the slider 73. The gravity drive assembly is rotatably disposed in the receiving groove 711 and is connected to the slider 73 in a transmission connection. One end of the baffle 72 is connected to the gravity drive assembly, and the other end of the baffle 72 is provided with a limiting part 721. The limiting part 721 is limited and engaged with the limiting groove 31 opened at the end of the hook 3.
[0028] When the hook 3 hangs a heavy object, it causes the slider 73 to move down. The slider 73 drives the baffle 72 to rotate through the gravity drive component, so that its limiting part 721 is in a limiting engagement with the limiting groove 31.
[0029] The following will further describe a safety protection device for a rail-mounted crane according to this exemplary embodiment.
[0030] In some embodiments, a mounting plate 5 is provided between the electric hoist 2 and the running vehicle body 1. The mounting plate 5 is provided with an elastic pawl structure 6, which is connected to the drive shaft of the electric hoist 2. The elastic pawl structure 6 can lock the drive shaft of the drive motor in the event of a power outage, preventing it from reversing and causing the load to fall, thereby improving the safety performance of the crane.
[0031] The aforementioned elastic pawl structure 6 includes a ratchet 61, a pawl 62, and a first spring 63. The ratchet 61 is sleeved on the end of the drive shaft; the bottom end of the pawl 62 engages with the ratchet 61, and the top end of the pawl 62 extends into the mounting plate 5 and is connected to the mounting plate 5 through the first spring 63. The side wall of the pawl 62 is slidably connected to the mounting plate 5. When the drive motor drives the transmission shaft to rotate forward, the pawl 62 engages with the ratchet 61, and due to the action of the first spring 63, the pawl 62 can slide within the groove of the mounting plate 5. When the ratchet 61 rotates forward, the pawl 62 has no effect on the rotation of the ratchet 61. When there is a sudden power outage, if the drive shaft reverses due to the weight of the load, the pawl 62 can block the rotation of the ratchet 61. Since the right end of the drive shaft is connected to the central area of the left side wall of the ratchet 61, the drive shaft can be locked during a power outage, improving safety.
[0032] In some embodiments, a fall arrestor 7 is provided between the hook 3 and the wire rope 4. The fall arrestor 7 includes a safety seat 71, a baffle 72, a slider 73, and a gravity drive assembly. The safety seat 71 is provided with a receiving groove 711. The slider 73 is slidably disposed in the receiving groove 711 and elastically connected to its bottom. The hook 3 is connected to the bottom of the slider 73. After the hook 3 lifts a heavy object, it can drive the slider 73 to move down under the action of gravity. When the heavy object is removed, the slider 73 can automatically move up and reset under the action of elasticity. The gravity drive assembly is rotatably disposed in the receiving groove 711 and is connected to the slider 73 via transmission; one end of the baffle 72 is connected to the gravity drive assembly, and the other end of the baffle 72 is provided with a limiting part 721, which is limited and engaged with the limiting groove 31 opened at the end of the hook 3; when the hook 3 hangs a heavy object and drives the slider 73 to move down, the slider 73 drives the baffle 72 to rotate through the gravity drive assembly, so that its limiting part 721 is engaged with the limiting groove 31.
[0033] In a preferred embodiment, the gravity drive assembly includes a rack 74, a gear 75, and a rotating shaft 76. Both ends of the rotating shaft 76 are rotatably connected to the inner wall of the receiving groove 711. The gear 75 is fitted onto the rotating shaft 76. The rack 74 is fixedly connected to the slider 73 and faces the gear 75, allowing it to mesh with the gear 75. One end of the baffle 72 is fitted onto the rotating shaft 76, and the other end of the baffle 72 extends outward through the bottom of the safety seat 71. The bottom of the safety seat 71 has a notch for the baffle 72 to rotate. When the slider 73 moves downward, it drives the rack 74 downward. The downward movement of the rack 74 drives the gear 75 to rotate. The rotation of the gear 75 drives the rotating shaft 76 to rotate. The rotation of the rotating shaft 76 drives the baffle 72 to rotate at a certain angle until its end, the limiting part 721, engages with the limiting groove 31 at the opening of the hook 3, thus locking the hook 3 and providing safety protection for the suspended load. No matter how the wire rope 4 swings, it will not fall.
[0034] In a preferred embodiment, the hook 3 and the baffle 72 are both positioned at the center of the safety seat 71; the end of the baffle 72 is fitted onto the center of the rotating shaft 76; and the gear 75 is fitted onto the rotating shaft 76 near its end. By placing the hook 3 and the baffle 72 at the center of the safety seat 71, the load can be suspended at the center of the safety seat 71, thereby ensuring the balance of the safety seat 71.
[0035] In a preferred embodiment, the baffle 72 is arc-shaped and recessed towards the inside of the hook 3. This facilitates the rotation of the baffle 72 within the hook 3, enabling the opening and closing of the hook 3.
[0036] In a preferred embodiment, the aforementioned limiting part 721 is disposed at the end of the baffle 72 away from the safety seat 71, and the limiting part 721 is hook-shaped; the limiting groove 31 is inclined, and its opening faces the bottom of the hook 3. When the baffle 72 rotates to the opening of the hook 3, the hook-shaped limiting part 721 is inclinedly inserted into the opening of the limiting groove 31. When the heavy object is removed, the limiting part 721 can be disengaged from the inclined limiting groove 31, facilitating the locking between the limiting part 721 and the limiting groove 31.
[0037] In a preferred embodiment, the slider 73 includes a sliding portion 731 and a connecting portion 732. The sliding portion 731 is slidably connected to the inner wall of the receiving groove 711, and the bottom of the sliding portion 731 is connected to the bottom of the safety seat 71 via multiple second springs 77. The connecting portion 732 is movably inserted through the bottom of the receiving groove 711 and is integrally connected to the sliding portion 731. The hook 3 is connected to the bottom of the connecting portion 732. The rack 74 is connected to one side of the connecting portion 732. By configuring the slider 73 as an integrally connected sliding portion 731 and connecting portion 732, the slider 73 can slide along the interior of the safety seat 71 and can also be connected to the hook 3 and inserted through the bottom of the safety seat 71.
[0038] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.
[0039] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.
Claims
1. A safety protection device for a rail-mounted crane, the rail-mounted crane comprising a traveling body, an electric hoist, and a hook, wherein the traveling body is slidably mounted on the crane beam, the electric hoist is connected to the bottom of the traveling body, and the hook is connected to the electric hoist via a wire rope; characterized in that, An installation plate is provided between the electric hoist and the running vehicle body. The installation plate is provided with an elastic pawl structure, which is connected to the drive shaft of the electric hoist. A fall protection structure is provided between the hook and the wire rope. The fall protection structure includes a safety seat, a baffle, a slider, and a gravity drive assembly. The safety seat has a receiving groove. The slider is slidably disposed in the receiving groove and elastically connected to its bottom. The hook is connected to the bottom of the slider. The gravity drive assembly is rotatably disposed in the receiving groove and is drivenly connected to the slider. One end of the baffle is connected to the gravity drive assembly, and the other end of the baffle has a limiting part that engages with a limiting groove at the end of the hook. The gravity drive assembly includes a rack, a gear, and a rotating shaft. Both ends of the rotating shaft are rotatably connected to the inner wall of the receiving groove. The gear is sleeved on the rotating shaft. The rack is fixedly connected to the slider and faces the gear, enabling it to mesh with the gear. One end of the baffle is sleeved on the rotating shaft, and the other end of the baffle extends outward through the bottom of the safety seat. The bottom of the safety seat has a notch for the baffle to rotate. When the hook suspends a heavy object, it causes the slider to move downward. The slider drives the baffle to rotate through the gravity drive assembly, so that its limiting part engages with the limiting groove.
2. The safety protection device for rail-mounted cranes according to claim 1, characterized in that, The elastic pawl structure includes a ratchet, a pawl, and a first spring. The ratchet is sleeved on the end of the drive shaft. The bottom end of the pawl engages with the ratchet, the top end of the pawl extends into the mounting plate and is connected to the mounting plate through the first spring, and the sidewall of the pawl is slidably connected to the mounting plate.
3. The safety protection device for a rail-mounted crane according to claim 1, characterized in that, The hook and the baffle are both inserted through the center of the safety seat; the end of the baffle is fitted onto the center of the rotating shaft; the gear is fitted onto the rotating shaft near the end.
4. The safety protection device for a rail-mounted crane according to claim 1, characterized in that, The baffle is arc-shaped and recessed towards the inside of the hook.
5. The safety protection device for a rail-mounted crane according to claim 1, characterized in that, The limiting part is located at the end of the baffle away from the safety seat, and the limiting part is hook-shaped; the limiting groove is inclined and its opening faces the bottom of the hook.
6. The safety protection device for a rail-mounted crane according to any one of claims 1-5, characterized in that, The slider includes a sliding part and a connecting part. The sliding part is slidably connected to the inner wall of the receiving groove, and the bottom of the sliding part is connected to the bottom of the safety seat through a plurality of second springs. The connecting part is movably inserted through the bottom of the receiving groove and is integrally connected to the sliding part. The hook is connected to the bottom of the connecting part.