Electric single-beam crane with safety protection structure

Abstract

The utility model discloses an electric single-beam crane with a safety protection structure, and relates to the technical field of electric single-beam cranes, the electric single-beam crane comprises a main beam and an electric hoist, the main beam comprises an I-shaped steel rail for the electric hoist to move, and an inclined plate is arranged at the end part of the I-shaped steel rail; the electric hoist is connected with a protection structure, and the protection structure comprises a swing arm, an auxiliary wheel and a tension spring; the lower end of the swing arm is rotatably connected with the electric hoist, the auxiliary wheel is rotatably mounted at the upper end of the swing arm and moves along the I-shaped steel rail, and the tension spring is connected between the middle of the swing arm and the electric hoist and enables the auxiliary wheel to be attached to the I-shaped steel rail. The strong tension spring is used for dragging the swing arm, when the electric hoist moves to the end portion of the main beam, the inclined plate enables the auxiliary wheel to ascend and the swing arm to overcome swing of the tension spring, effective buffering protection is formed, and limit to the stroke of the electric hoist is small.

Description

Technical Field

[0001] The utility model relates to the technical field of electric single-girder cranes, in particular to an electric single-girder crane with a safety protection structure. Background Art

[0002] In modern industry, electric single-girder cranes, with their high efficiency, stability, and flexibility, have become essential equipment for material handling and lifting operations. They offer smooth operation and adjustable speed, enabling precise lifting of heavy loads to designated locations. Their lightweight and sturdy main beam, welded from high-quality I-beams and box beams, offers excellent load-bearing capacity and resistance to deformation.

[0003] The electric single-girder crane in the prior art includes a main beam and an electric hoist. An I-beam track for reciprocating movement of the electric hoist is set at the lower part of the main beam. Buffer and anti-collision devices are set at both ends of the I-beam track to limit and protect the electric hoist. For example, the utility model patent with publication number CN204847834U is a cross-span single-girder crane. The buffer and anti-collision device mainly relies on the deformation of the rubber block itself to absorb impact, and the buffering effect needs to be improved; the small size of the rubber block leads to poor buffering effect, and the large size of the rubber block will limit the effective stroke of the electric hoist provided by the main beam I-beam. Utility Model Content

[0004] The purpose of the present utility model is to provide an electric single-girder crane with a safety protection structure in order to solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An electric single-girder crane with a safety protection structure includes a main beam and an electric hoist. The main beam includes an I-beam track for moving the electric hoist, and an inclined plate is provided at the end of the I-beam track; the electric hoist is connected to a protection structure, which includes a swing arm, an auxiliary wheel and a tension spring; the lower end of the swing arm is rotatably connected to the electric hoist, and the auxiliary wheel is rotatably installed at the upper end of the swing arm. The auxiliary wheel moves along the I-beam track, and the tension spring is connected between the middle of the swing arm and the electric hoist, so that the tension spring makes the auxiliary wheel close to the I-beam track.

[0007] Furthermore, the electric hoist is connected to two sets of protective structures; the two sets of protective structures are respectively located on both sides of the electric hoist travel structure, and the tension springs are both connected to the side of the swing arm facing away from the electric hoist travel structure.

[0008] Furthermore, a rack section is provided in the middle of the swing arm.

[0009] Furthermore, the auxiliary wheel moves upward along the inclined plate so that the rack section in the middle of the swing arm approaches the gear of the electric hoist travel structure and meshes with the gear.

[0010] Furthermore, the rack segment slides linearly along the swing arm; a sliding groove for the rack segment to slide is provided on the swing arm.

[0011] Furthermore, a spring is connected between the upper side of the rack segment and the inner side of the upper end of the sliding groove.

[0012] Furthermore, a buffer block is provided on the inner side of the lower end of the sliding groove.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The present utility model uses a strong pulling spring to pull the swing arm. When the electric hoist moves to the end of the main beam, the inclined plate causes the auxiliary wheel to rise and the swing arm to swing against the pulling spring, forming an effective buffer protection, and having a small limit on the stroke of the electric hoist; when the electric hoist moves normally, the auxiliary wheel rotates closely against the I-beam, providing more support for the movement of the electric hoist and improving the smoothness of the operation of the electric hoist.

[0015] The present utility model has a rack segment, which can limit the rotation of the gear of the electric hoist, and thus realize limit protection for the movement of the electric hoist; the rack segment can slide and is supported by a spring. When the electric hoist moves in the reverse direction, the gear can be smoothly separated from the rack segment, without affecting the reverse movement of the electric hoist. The buffer block provides buffer protection for the rack segment to reduce the impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0017] Figure 2 is an end structural schematic diagram of the present utility model.

[0018] Figure 3 is a schematic diagram of the normal state of the protection structure of the present utility model.

[0019] Figure 4 is a schematic diagram of the protection state of the protection structure of the present utility model.

[0020] In the figure: 1, main beam; 101, I-beam track; 102, inclined plate;

[0021] 2, electric hoist;

[0022] 3, protection structure; 301, swing arm; 302, auxiliary wheel; 303, pulling spring; 304, sliding groove; 305, rack segment; 306, spring; 307, buffer block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0024] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object of "provided with" may be a part of the body, or it may be arranged separately from the body and connected to the body, and this connection may be a detachable connection or a non-detachable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0026] The present utility model will be further described in detail below in conjunction with embodiments.

[0027] Specific embodiments of the electric single-girder crane with a safety protection structure provided by the present utility model:

[0028] Please refer to Figures 1-4 , an electric single-girder crane with a safety protection structure, including a main girder 1 and an electric hoist 2. The main girder 1 includes a box girder and an I-beam track 101 for the electric hoist 2 to move. The upper part of the I-beam track 101 extends into the interior of the box girder. Inclined plates 102 are provided at both ends of the I-beam track 101. The lower end of the inclined plate 102 is flush with the lower side of the I-beam track 101, and the upper end of the inclined plate 102 is connected to the lower side of the end of the box girder. The inclined plate 102 forms an obtuse angle with the lower support surface of the I-beam track 101.

[0029] In this embodiment, mounting plates for connecting to end girders are provided at both ends of the main girder 1, that is, the electric single-girder crane in this embodiment is a bridge-type single-girder crane. In some other embodiments, legs are connected to both ends of the main girder 1, that is, a gantry-type single-girder crane.

[0030] In this embodiment, the upper part of the electric hoist 2 is provided with a traveling structure that moves along the I-beam track 101. The traveling structure includes a driving wheel, a driven wheel, and a motor for driving the driving wheel to rotate. The traveling structure further includes a traveling frame for supporting the driving wheel, the driven wheel, and the motor. The traveling frame is connected to the upper side of the housing of the electric hoist 2, and the driving wheel is provided with gears. The structural forms of the electric hoist 2 and the main beam 1 are both prior arts.

[0031] Two groups of protective structures 3 are connected to the electric hoist 2, and the two groups of protective structures 3 are respectively located on both sides of the traveling structure of the electric hoist 2.

[0032] Specifically, the protective structure 3 includes a swing arm 301, an auxiliary wheel 302, and a tension spring 303. The lower end of the swing arm 301 is rotatably connected to the traveling frame of the electric hoist 2. The auxiliary wheel 302 is rotatably installed at the upper end of the swing arm 301. The auxiliary wheel 302 moves along the I-beam track 101. The tension spring 303 is connected between the middle of the swing arm 301 and the upper side of the housing of the electric hoist 2, and the tension spring 303 is connected to the side of the swing arm 301 facing away from the traveling structure of the electric hoist 2.

[0033] The strong tension spring 303 makes the auxiliary wheel 302 tightly adhere to the I-beam track 101. When the electric hoist 2 normally moves along the I-beam track 101, the auxiliary wheel 302 provides auxiliary support for the traveling movement of the electric hoist 2, which can improve the running stability of the electric hoist 2.

[0034] In this embodiment, a rack section 305 is provided in the middle of the swing arm 301. When the electric hoist 2 moves to one end of the main beam 1, the auxiliary wheel 302 first moves to the inclined plate 102. The auxiliary wheel 302 moves upward along the inclined plate 102 to change the angle of the swing arm 301. The swing arm 301 approaches the gear of the traveling structure and stretches the tension spring 303 against the tension of the tension spring 303. The strong tension spring 303 forms a reaction buffer protection for the electric hoist 2. The auxiliary wheel 302 continues to move upward, causing the rack section 305 in the middle of the swing arm 301 to approach the gear of the traveling structure of the electric hoist 2 and mesh with the gear, as Figure 2 shown in the right protective structure 3 and Figure 4 When the gear meshes with the rack section 305, both the swing arm 301 and the rack section 305 can limit the further rotation of the gear. The tension of the tension spring 303 continuously increases, and the power of the motor of the traveling structure is not sufficient to lift the electric hoist 2 and the lifted heavy object, restricting the further movement of the electric hoist 2 towards the end. At this time, there is a small gap between the traveling structure of the electric hoist 2 and the inclined plate 102, making full use of the length of the I-beam track 101 as the effective stroke of the electric hoist 2.

[0035] After the electric hoist 2 is rotationally restricted, in order to enable the electric hoist 2 to rotate in the reverse direction, it is necessary to automatically separate the rack section 305 from the gear. Therefore, in this embodiment, the rack section 305 slides linearly along the swing arm 301; a sliding groove 304 for the rack section 305 to slide is provided on the swing arm 301. The cross-sectional shape of the sliding groove 304 can be T-shaped or dovetail-shaped. One side of the rack section 305 is set to be T-shaped or dovetail-shaped to match the sliding groove 304, ensuring that the rack section 305 can only move linearly; a spring 306 is connected between the upper side of the rack section 305 and the inner side of the upper end of the sliding groove 304; a buffer block 307 is provided on the inner side of the lower end of the sliding groove 304, and the buffer block 307 is a rubber block.

[0036] When the rack section 305 is in a state without external force, the spring 306 creates a gap between the rack section 305 and the buffer block 307, as Figure 3 shown. During the limiting process of the aforementioned electric hoist 2 moving towards the end of the main beam 1, the gear will first cause the rack section 305 to move downward along the sliding groove 304 and stop after hitting the buffer block 307. The buffer block 307 provides buffer protection, and the rack section 305 then limits the gear and the electric hoist 2.

[0037] As Figure 2 and Figure 4 shown in the state, when the electric hoist 2 moves from the limiting position towards the middle of the main beam 1, the gear of the traveling structure of the electric hoist 2 rotates in the reverse direction, causing the rack section 305 to compress the spring 306 and move upward. The electric hoist 2 and the gear move towards the middle of the main beam 1 and are smoothly separated from the rack section 305.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Electric single-girder crane with a safety protection structure, comprising a main girder (1) and an electric hoist (2), wherein the main girder (1) includes an I-beam track (101) for the electric hoist (2) to move, and an inclined plate (102) is provided at the end of the I-beam track (101); characterized in that: A protective structure (3) is connected to the electric hoist (2). The protective structure (3) includes a swing arm (301), an auxiliary wheel (302), and a tension spring (303). The lower end of the swing arm (301) is rotatably connected to the electric hoist (2). The auxiliary wheel (302) is rotatably installed at the upper end of the swing arm (301). The auxiliary wheel (302) moves along the I-beam track (101). The tension spring (303) is connected between the middle of the swing arm (301) and the electric hoist (2), and the tension spring (303) makes the auxiliary wheel (302) closely adhere to the I-beam track (101).

2. The electric single-girder crane with a safety protection structure according to claim 1, wherein: Two groups of protective structures (3) are connected to the electric hoist (2). The two groups of protective structures (3) are respectively located on both sides of the traveling structure of the electric hoist (2), and the tension springs (303) are both connected to the side of the swing arm (301) facing away from the traveling structure of the electric hoist (2).

3. The electric single-girder crane with a safety protection structure according to claim 1 or 2, characterized in that: A rack section (305) is provided in the middle of the swing arm (301).

4. The electric single-girder crane with a safety protection structure according to claim 3, characterized in that: The auxiliary wheel (302) moves upward along the inclined plate (102) so that the rack section (305) in the middle of the swing arm (301) approaches the gear of the traveling structure of the electric hoist (2) and meshes with the gear.

5. The electric single-girder crane with a safety protection structure according to claim 3, characterized in that: The rack section (305) slides linearly along the swing arm (301). A sliding groove (304) for the rack section (305) to slide is provided on the swing arm (301).

6. The electric single-girder crane with a safety protection structure according to claim 5, characterized in that: A spring (306) is connected between the upper side of the rack section (305) and the inner side of the upper end of the sliding groove (304).

7. The electric single-girder crane with a safety protection structure according to claim 6, characterized in that: A buffer block (307) is provided on the inner side of the lower end of the sliding groove (304).

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