Safety limiting device for preventing electric hoist from falling on a beam lifting machine

Abstract

The utility model discloses a kind of safety limiting devices for preventing electric hoist from falling on beam lifting machine, belong to road and bridge construction device technical field;It includes the bottom platform for installing electric hoist;Several groups of rollers are installed on the upside of bottom platform through vertical frame;Roller is driven by motor, and each group of rollers is correspondingly set on the left and right sides of the lower flange of track I-beam;Extension support is further provided on vertical frame;Roller cylinder is rotatably mounted on extension support;The spacing between roller cylinder and track I-beam web is less than the spacing size between corresponding roller and web;The utility model effectively solves the problem that track I-beam working with 20-ton electric hoist on beam lifting machine will have the risk of electric hoist falling off after deformation.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge construction equipment technology, specifically to a safety limit device for preventing the electric hoist from falling off a beam lifting machine. Background Technology

[0002] When using a beam lifting machine to assuming prestressed box girder, a 20-ton small electric hoist is required. The supports of these small electric hoists are installed on both sides of the track I-beam via rollers. The small electric hoist can move relative to the track I-beam using the rollers driven by the motor. However, after long-term operation, the track I-beam may deform, which may lead to the safety risk of the electric hoist falling off the track I-beam. Based on this, it is necessary to design a limiting device to prevent the electric hoist from falling off. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a safety limit device for preventing the electric hoist from falling off on a beam lifting machine, so as to solve the safety risk of the electric hoist falling off when the track I-beam working with the 20-ton electric hoist on the beam lifting machine deforms.

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] A safety limiting device for preventing electric hoists from falling off a beam lifting machine; it includes a base platform for mounting the electric hoist; several sets of rollers are mounted on the upper side of the base platform via a vertical frame; the rollers are driven by a motor, and each set of rollers is correspondingly arranged on the left and right sides of the lower flange of the track I-beam; an extension support is also provided on the vertical frame; a roller is rotatably mounted on the extension support; the distance between the roller and the web of the track I-beam is smaller than the distance between the corresponding roller and the web.

[0006] Preferably, the support frame is a rectangular flat plate structure installed vertically; the extended support is fixed to the back side of the support frame by welding.

[0007] Preferably, there are two sets of rollers; two rollers are provided for each of the uprights and extended supports on the same side of the track I-beam; the two extended supports are respectively set at the opposite end positions of the two uprights.

[0008] Preferably, the extended support includes a channel steel; the back side of the channel steel is attached to the upright for installation, and one end extends outward from the upright in a cantilever shape; a hollow square steel is installed on the extended end of the channel steel; support plates are respectively provided on the upper and lower sides of the end face of the hollow square steel facing the web of the track I-beam; coaxial positioning holes are opened on the two support plates; the roller is rotatably installed at the positioning holes of the two support plates.

[0009] Furthermore, the hollow square steel is positioned close to the roller, and the two do not interfere with each other; the support plate is a trapezoidal flat plate component, with one side of its lower bottom edge connected to the hollow square steel, and one side of its upper bottom edge extending cantilevered toward the web of the track I-beam; a protective pad is also provided between the roller and the support plate located on the lower side.

[0010] Furthermore, the channel steel, hollow square steel, and support plates are made of steel and are integral structures fixed by welding.

[0011] Preferably, the length of the roller is less than the working diameter of the roller, and the top height of the roller does not exceed the top height of the roller.

[0012] The beneficial effects of this utility model are reflected in the following aspects:

[0013] 1. By installing a rotatable roller on the extended support set on the back side of the upright, the roller and the web of the track I-beam are kept at a gap smaller than the roller spacing; when the track I-beam deforms and the web shifts, the roller will first contact the web to form a physical limit, effectively preventing the roller from detaching from the track I-beam flange, fundamentally avoiding the risk of the electric hoist falling from a height.

[0014] 2. The rotatable design of the rollers significantly reduces the frictional resistance when in contact with the web, ensuring both the limiting function and preventing the equipment from jamming.

[0015] 3. The integrated steel structure, constructed from channel steel, hollow square steel, and trapezoidal support plates, ensures sufficient rigidity and impact resistance of the extended supports, maintaining stable support even under harsh working conditions.

[0016] 4. The roller's dimensions are controlled so that its top height never exceeds that of the roller, satisfying protection requirements without affecting the normal operating space of the equipment; the addition of protective pads further reduces wear between components and extends the service life of the device.

[0017] 5. The overall structure significantly improves the safety and reliability of the equipment without substantially increasing its weight, making it particularly suitable for road and bridge construction environments under long-term heavy load conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention in an embodiment;

[0019] Figure 2 yes Figure 1 A sectional view of the device along the AA direction;

[0020] Figure 3 yes Figure 1 Right view of the device;

[0021] Explanation of reference numerals in the attached drawings: 1. Base platform, 2. Frame, 3. Roller, 4. Track I-beam, 5. Extended support, 6. Roller, 7. Motor, 51. Channel steel, 52. Hollow square steel, 53. Support plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] Example:

[0024] Reference Figures 1 to 3 This embodiment provides a safety limiting device to prevent the electric hoist from falling off a beam lifting machine. It includes a base platform 1 for mounting the electric hoist; several sets of rollers 3 are mounted on the upper side of the base platform 1 via a vertical frame 2; the rollers 3 are driven by a motor 7, and each set of rollers 3 is correspondingly positioned on the left and right sides of the lower flange of the track I-beam 4; an extension support 5 is also provided on the vertical frame 2; a roller 6 is rotatably mounted on the extension support 5; the distance between the roller 6 and the web of the track I-beam 4 is smaller than the distance between the corresponding roller 3 and the web. In this embodiment, a flat frame for placing the motor 7 is provided on the base platform 1 adjacent to the vertical frame, and the motor is connected to the rollers via a coupling.

[0025] The support frame 2 is a rectangular flat plate structure installed vertically; the extended support 5 is fixed to the back side of the support frame 2 by welding.

[0026] There are two sets of rollers 3; the uprights 2 and extended supports 5 on the same side of the track I-beam 4 each have two rollers 3; these two extended supports 5 are respectively set at the opposite end positions of the two uprights 2. This symmetrical arrangement provides reliable limiting protection on both sides of the track I-beam 4. No matter which side the web shifts due to track deformation, the protection mechanism can be effectively triggered to ensure the symmetrical stability of the equipment operation.

[0027] The extended support 5 includes a channel steel 51; the back side of the channel steel 51 is attached to the upright 2 for installation, and one end extends outward in a cantilever shape towards the outside of the upright 2; a hollow square steel 52 is installed on the extended end of the channel steel 51; support plates 53 are respectively provided on the upper and lower sides of the end face of the hollow square steel 52 facing the web of the track I-beam 4; coaxial positioning holes are opened on the two support plates 53; the roller 6 is rotatably installed at the positioning holes of the two support plates 53. The cantilever design of the channel steel 51 effectively increases the overhang distance of the roller 6 relative to the upright 2, allowing it to be closer to the web of the track I-beam 4, while the structural characteristics of the channel steel itself provide good bending resistance to support the operation of the roller. The hollow square steel 52 enhances the local rigidity and torsional resistance of the cantilever end.

[0028] Hollow square steel 52 is positioned close to roller 3 without interfering with it. Support plate 53 is a trapezoidal flat plate with its lower base connected to hollow square steel 52, and its upper base extending cantilevered towards the web of track I-beam 4. Protective pads are also provided between roller 6 and the lower support plate 53. The trapezoidal support plate 53 design ensures sufficient support area and rigidity while minimizing structural weight, and its cantilevered end provides a precise positioning point for roller 6. The protective pads absorb minor vibrations and impacts that may occur during roller 6 rotation, protecting the mounting holes of support plate 53 and the shaft end of roller 6, significantly reducing wear and extending the service life of critical components.

[0029] The channel steel 51, hollow square steel 52, and support plate 53 are made of steel and are fixed by welding as a single unit. This integrally welded structure eliminates weak points at the joints, ensuring that the entire extended support 5 has excellent structural integrity and load-bearing capacity, and can withstand the large impact loads that may be generated when the track deforms without being damaged or plastically deformed.

[0030] The length of roller 6 is less than the working diameter of roller 3, and the top height of roller 6 does not exceed the top height of roller 3. This dimensional design ensures that roller 6 only contacts the track web when it needs to perform a limiting function, maintaining a reasonable gap with the web during normal operation of the equipment, and does not affect the free rolling and load-bearing of roller 3 on the track flange. At the same time, the design that its top does not exceed that of roller 3 also avoids the possibility of accidental interference with other structures or cables above the track.

[0031] The core working principle of this safety limit device lies in the preset distance difference and contact limit guidance.

[0032] When the equipment is running normally, the roller 3 straddles the lower flange of the track I-beam 4 and rolls. At this time, there is a preset small gap between the roller 6 and the track web (this gap is smaller than the gap between the roller 3 and the web). When the track I-beam 4 deforms due to long-term use or load, causing its web to shift relative to the traveling mechanism of the electric hoist, the web will first approach and contact the roller.

[0033] Upon contact, roller 6 immediately acts as a physical barrier to prevent further web offset. Since roller 6 is rigidly connected to the base platform 1 via robust extension supports 5 and the upright 2, this blocking force is directly transmitted, effectively preventing roller 3 from slipping off the lower flange edge of the track I-beam 4. Furthermore, roller 6 is designed to rotate freely; when the web contacts the rotating roller 6, rolling friction, rather than sliding friction, is generated. This significantly reduces contact resistance, preventing the electric hoist from abruptly stopping or jamming due to intense friction at the moment of contact. Operators have time and opportunity to detect abnormalities and take stop-and-inspection measures. Even if the equipment still has a slight tendency to move after contact, the rolling motion of roller 6 guides the web to slide along its tangential direction, avoiding scratching the web surface or causing severe wear to roller 6 itself, while still effectively maintaining the limiting function to prevent roller derailment.

[0034] On the other hand, the contact between roller 6 and the web plate, as well as the accompanying friction noise or increased running resistance, can serve as an early warning signal, indicating to the operator that the track may have been deformed and needs to be repaired in time, thereby eliminating potential hazards before an accident occurs.

Claims

1. A safety limiting device for preventing electric hoists from falling off a beam lifting machine, comprising a base platform (1) for mounting the electric hoist; several sets of rollers (3) are mounted on the upper side of the base platform (1) via a vertical frame (2); the rollers (3) are driven by a motor (7), and each set of rollers (3) is correspondingly arranged on the left and right sides of the lower flange of the track I-beam (4); characterized in that: An extension support (5) is also provided on the upright (2); a roller (6) is rotatably installed on the extension support (5); the distance between the roller (6) and the web of the track I-beam (4) is smaller than the distance between the corresponding roller (3) and the web.

2. The safety limit device for preventing the electric hoist from falling off a beam lifting machine according to claim 1, characterized in that: The upright (2) is a rectangular flat plate structure installed vertically; the extended support (5) is fixed to the back side of the upright (2) by welding.

3. The safety limit device for preventing the electric hoist from falling off a beam lifting machine according to claim 1, characterized in that: There are two sets of rollers (3); the uprights (2) and extension supports (5) on the same side of the track I-beam (4) are each provided with two rollers (3); the two extension supports (5) are respectively set at the opposite end positions of the two uprights (2).

4. A safety limit device for preventing electric hoists from falling off a beam lifting machine according to claim 1, characterized in that: The extended support (5) includes a channel steel (51); the back side of the channel steel (51) is attached to the upright (2) for installation, and one end of it extends outward from the upright (2) in a cantilever shape; a hollow square steel (52) is installed on the extended end of the channel steel (51); support plates (53) are respectively provided on the upper and lower sides of the end face of the hollow square steel (52) facing the web of the track I-beam (4); coaxial positioning holes are opened on the two support plates (53); the roller (6) is rotatably installed at the positioning holes of the two support plates (53).

5. A safety limit device for preventing the electric hoist from falling off a beam lifting machine according to claim 4, characterized in that: Hollow square steel (52) is set close to roller (3) and the two do not interfere with each other; support plate (53) is a trapezoidal flat plate component, with its lower bottom side connected to hollow square steel (52) and its upper bottom side extending out in a cantilever shape toward the web of track I-beam (4); protective pads are also provided between roller (6) and support plate (53) located on the lower side.

6. A safety limit device for preventing the electric hoist from falling off a beam lifting machine according to claim 4, characterized in that: The channel steel (51), hollow square steel (52) and support plate (53) are integral structures made of steel and fixed by welding.

7. A safety limit device for preventing electric hoists from falling off a beam lifting machine according to claim 1, characterized in that: The length of the roller (6) is less than the working diameter of the roller (3), and the top height of the roller (6) does not exceed the top height of the roller (3).

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