Crane lifting hook with heavy punch limiting triggering device

Abstract

The utility model relates to the technical field of cranes, in particular to a crane lifting hook with a heavy punch limiting trigger device. The winch is connected with a pulley block through a winch steel wire rope, a rotating shaft penetrates through the pulley block in the axial direction, a shell is connected to the outer side of the pulley block through the rotating shaft, and a lifting hook is hinged to the bottom of the shell. A limiting switch is installed at the bottom of the crane beam and connected with a heavy hammer through a heavy hammer steel wire rope, a vertical plate is installed on the side wall of the shell, and a transverse plate is horizontally installed at the top of the vertical plate and located below the heavy hammer. When the winch drives the lifting hook to ascend through the pulley block, the transverse plate ascends along with the lifting hook, and when the transverse plate touches the heavy hammer, the transverse plate supports the heavy hammer, so that the heavy hammer cannot swing, collision between the heavy hammer and the lifting hook and between the heavy hammer and the pulley block is avoided, and protection action of the heavy hammer limiting device is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a crane hook with a counterweight limit triggering device. Background Technology

[0002] The counterweight limit device of a crane is a mechanical safety protection device, mainly used to limit the upper or lower limit position of the hook to prevent the hook from hitting the top, the wire rope from breaking, or the equipment from being damaged due to operational errors.

[0003] A Chinese utility model patent with application number 202223247745.7 discloses a height limiting installation and connection device for a grab crane. It features a fixed rod with a fixed base at the upper end mounted on the grab crane trolley. The fixed rod is connected to the bottom of the fixed base, and the lower end of the fixed rod is rotatably connected to a movable rod. A counterweight is mounted on the grab crane trolley, and the counterweight is connected to a fixed ring via a limiting wire rope. During operation, the grab crane rises and first touches the movable rod, then the movable rod rises and touches the fixed ring, causing the limiting wire rope to bend and triggering the counterweight to achieve the limiting purpose. However, the counterweight limiting device itself lacks a limiting structure. During crane operation, the fixed ring swings disorderly with the limiting wire rope, causing the counterweight limiting device to sway with the wire rope. This results in the fixed ring failing to land on the movable rod during the lifting process, preventing it from rising with the grab crane. This is detrimental to the protective action of the counterweight limiting device, and the grab crane directly collides with the movable rod, easily causing damage to the grab crane. Utility Model Content

[0004] To address the technical problem of direct collision between the crane hook and the counterweight limiter in existing technologies, a crane hook with a counterweight limiter triggering device is provided.

[0005] The technical means adopted in this utility model are as follows:

[0006] A crane hook with a counterweight limit triggering device includes a winch, a counterweight, a winch wire rope, a pulley block, a limit switch, a housing, a horizontal plate, a vertical plate, a crane beam, a rotating shaft, and a hook. The winch is mounted on the crane beam and connected to the pulley block via the winch wire rope. The rotating shaft is mounted on the axial side of the pulley block via a bearing. The housing is connected to the outer side of the pulley block via the rotating shaft, and the hook is hinged to the bottom of the housing. A limit switch is mounted on the bottom of the crane beam and connected to the counterweight via the counterweight wire rope. A vertical plate is mounted on the side wall of the housing, and a horizontal plate is horizontally mounted on top of the vertical plate, with the horizontal plate located below the counterweight.

[0007] Furthermore, the horizontal plate is provided with an opening and a limiting hole through which the counterweight cannot pass. The two ends of the opening are located at the inner edge of the upper limiting hole and the outer edge of the horizontal plate, respectively, making the horizontal plate a non-closed structure. The winch wire rope is located inside the limiting hole.

[0008] Furthermore, the area of ​​the upper surface of the horizontal plate is greater than the area enclosed by the maximum swing path of the weight.

[0009] Furthermore, the limiting hole is circular.

[0010] Furthermore, the opening is strip-shaped.

[0011] Furthermore, the limit switch is a travel switch.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] When the winch drives the hook to rise through the pulley block, the horizontal plate rises along with the hook. When the horizontal plate touches the counterweight, it provides support for the counterweight, preventing it from swaying and avoiding collisions between the counterweight and the hook and pulley block. This also helps the counterweight limit device to operate safely. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A side view of a crane hook with a counterweight limit triggering device provided by this utility model.

[0016] Figure 2 The front view of a crane hook with a counterweight limit triggering device provided by this utility model.

[0017] Figure 3 A side view of the vertical and horizontal plate structure of a crane hook with a counterweight limiting triggering device provided by this utility model.

[0018] Figure 4 The front view of the vertical and horizontal plate structure of a crane hook with a counterweight limit triggering device provided by this utility model.

[0019] Figure 5 A top view of the vertical and horizontal plate structure of a crane hook with a counterweight limiting triggering device provided by this utility model.

[0020] Figure 6 This utility model provides a schematic diagram of the state of the wire rope when the horizontal plate of the crane hook with a counterweight limit triggering device contacts the counterweight.

[0021] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0022] In the diagram: 1. Winch; 2. Counterweight; 3. Winch wire rope; 4. Pulley block; 5. Limit switch; 6. Housing; 7. Horizontal plate; 8. Vertical plate; 9. Opening; 10. Limit hole; 11. Counterweight wire rope; 12. Crane beam; 13. Shaft; 14. Hook. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] This utility model embodiment discloses a crane hook with a counterweight limiting triggering device, such as Figure 1-3 As shown, a winch 1 is installed on the crane beam 12. The winch 1 is connected to a pulley block 4 via a winch wire rope 3. A rotating shaft 13 is installed on the axial side of the pulley block 4 via a bearing. A housing 6 is connected to the outer side of the pulley block 4 via the rotating shaft 13. A hook 14 is hinged to the bottom of the housing 6. A limit switch 5 is installed at the bottom of the crane beam 12. The limit switch 5 is connected to a counterweight 2 via a counterweight wire rope 11. A vertical plate 8 is installed on the side wall of the housing 6. A horizontal plate 7 is installed horizontally on the top of the vertical plate 8. The horizontal plate 7 is located below the counterweight 2.

[0025] like Figure 4-5 As shown, the horizontal plate 7 has a strip-shaped opening 9 and a circular limiting hole 10 that the counterweight 2 cannot pass through. The two ends of the opening 9 are located at the inner edge of the limiting hole 10 and the outer edge of the horizontal plate 7, respectively, making the horizontal plate 7 a non-closed structure. The winch wire rope 3 is located inside the limiting hole 10. The limiting hole 10 and the winch wire rope 3 work together to limit and guide the horizontal plate 7. Since the winch wire rope 3 will sway during the movement of the hook, by designing the limiting hole 10 as a circle, it can play a certain role in protecting the winch wire rope 3 when the limiting hole 10 collides with the winch wire rope 3. The strip-shaped opening 9 allows the winch wire rope 3 to pass through easily. Since the winch wire rope 3 is located inside the limiting hole 10, the horizontal plate 7 is positioned above the pulley block 4, which can protect the pulley block 4.

[0026] The upper surface area of ​​the horizontal plate 7 is larger than the area enclosed by the maximum swing path of the counterweight 2, improving the stability of the horizontal plate 7 in supporting the counterweight 2 and ensuring that the counterweight 2 can land on the horizontal plate 7 during its ascent. A reinforcing rib connects the horizontal plate 7 and the vertical plate 8, improving the stability of the installation structure between them and enhancing the stability of the protective actions of the counterweight 2 and the limit switch 5. The limit switch 5 is a travel switch. The travel switch and its principle used in this invention are conventional techniques in the prior art.

[0027] The working principle of this utility model is as follows: The winch 1 drives the hook 14 to rise. Before the horizontal plate 7 contacts the counterweight 2, the counterweight wire rope 11 is taut due to the weight of the counterweight 2. The limit switch 5 is in its initial state, with its normally closed contacts remaining closed and its normally open contacts in the open state, thus forming a circuit. The equipment can rise normally according to the operator's instructions. When the horizontal plate 7 contacts the counterweight 2, if... Figure 6-7 As shown, the counterweight 2 is supported by the horizontal plate 7, causing it to rise. This pushes the counterweight wire rope 11 upwards, which in turn moves the operating head of the limit switch 5, causing its normally closed contact to open. This action directly cuts off the control circuit for the lifting direction. Simultaneously, during the opening of the normally closed contact, the normally open contact closes. The closing of the normally open contact can be used to connect an alarm device, such as an audible and visual alarm. Once the normally open contact closes, the alarm circuit is activated, and the alarm immediately emits sound and light signals, warning the operator that the equipment has reached its limit position and prompting them to take appropriate measures. When the hook or lifting device descends and no longer touches the counterweight, the counterweight returns to its initial suspension position under its own weight. The operating head of the limit switch also resets, and the limit switch's contact system returns to its initial state. The normally closed contact closes again, and the normally open contact opens, restoring the entire circuit to normal and preparing for the next limit protection cycle.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A crane hook with a weight-limited trigger device, characterized in that, The crane includes a winch (1), a counterweight (2), a winch wire rope (3), a pulley block (4), a limit switch (5), a housing (6), a horizontal plate (7), a vertical plate (8), a crane beam (12), a rotating shaft (13), and a hook (14). The winch (1) is mounted on the crane beam (12). The winch (1) is connected to the pulley block (4) via the winch wire rope (3). The rotating shaft (13) is mounted on the pulley block (4) axially via bearings. The outer side of the pulley block (4) is connected to the housing (6) via the pivot (13), and the bottom of the housing (6) is hinged with a hook (14); the bottom of the crane beam (12) is equipped with a limit switch (5), which is connected to the hammer (2) via a hammer wire rope (11); a vertical plate (8) is installed on the side wall of the housing (6), and a horizontal plate (7) is installed horizontally on the top of the vertical plate (8), which is located below the hammer (2).

2. A hoist hook with a weight-limited trigger device according to claim 1, characterized in that, The horizontal plate (7) is provided with an opening (9) and a limiting hole (10) through which the counterweight (2) cannot pass. The two ends of the opening (9) are located on the inner edge of the limiting hole (10) and the outer edge of the horizontal plate (7) respectively, making the horizontal plate (7) a non-closed structure. The winch wire rope (3) is located inside the limiting hole (10).

3. A hoist hook with a weight-limited trigger device according to claim 1, characterized in that, The area of ​​the upper surface of the horizontal plate (7) is greater than the area enclosed by the maximum swing path of the hammer (2).

4. A hoist hook with a weight-limited trigger device according to claim 2, characterized in that, The limiting hole (10) is circular.

5. A hoist hook with a weight-limited trigger device according to claim 2, characterized in that, The opening (9) is strip-shaped.

6. A crane hook with a counterweight limiting triggering device according to claim 1, characterized in that, The limit switch (5) is a travel switch.

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