A hook height sensor for a cableway crane

Abstract

The utility model discloses a kind of hook height sensors for crawler crane, specifically relates to hook height detection technical field, including mounting bracket and disc, and disc is located at the rear side of mounting bracket, the front side of disc is fixedly installed with multiple bosses, the both sides of mounting bracket are fixedly connected with side plate, the rear side of two side plates is fixedly installed with photoelectric switch, two photoelectric switches are all provided with protection assembly, two protection assemblies all include first protection cylinder, second protection cylinder, L type board, side plate, sliding cylinder, screw rod, limit plate, stripe handle, plug block, locking bolt and gasket.The utility model is rotated by disc with multiple bosses, boss enters detection area when triggering photoelectric switch to produce pulse signal, combine disc boss number conversion reel rotation number, then according to reel diameter calculation steel wire rope length variation, finally combine hook pulley block ratio to obtain hook height, easy to operate, it is convenient to calculate the height of hook.

Description

Technical Field

[0001] This utility model relates to the field of hook height detection technology, and more specifically, to a hook height sensor for crawler cranes. Background Technology

[0002] A crawler crane, also known as a tracked crane, is a type of large-scale engineering machinery. The tracks provide strong ground adhesion and stability, enabling it to move and operate on soft, muddy, rugged, and uneven construction site surfaces. The hook is the core component of the crawler crane that directly hooks the heavy object. It is connected to the drum via a wire rope and must bear the entire load of the lifting operation. Hook height detection is a key link in ensuring the safety and accuracy of lifting operations by monitoring the distance between the hook and the ground or a specific reference surface in real time.

[0003] When calculating the height of existing hooks, the counting method usually relies on the direct mechanical connection between the encoder and the drum shaft to calculate the height. However, the mechanical connection between the encoder and the drum shaft is easily affected by equipment vibration and impact, which can cause the installation to loosen and thus cause counting errors. At the same time, dust, oil and other impurities in the lifting operation environment can easily penetrate the precision structure inside the encoder, accelerating the wear and aging of the device. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a hook height sensor for crawler cranes, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hook height sensor for a crawler crane, comprising a mounting frame and a disc, wherein the disc is located on the rear side of the mounting frame, and multiple bosses are fixedly installed on the front side of the disc. Side plates are fixedly connected to both sides of the mounting frame, and photoelectric switches are fixedly installed on the rear sides of both side plates. Each of the two photoelectric switches is provided with a protective component. Each of the two protective components includes a first protective cylinder, a second protective cylinder, an L-shaped plate, a side plate, a sliding cylinder, a lead screw, a limiting plate, a striped handle, a plug, a locking bolt, and a washer. The second protective cylinder is movably sleeved on the first protective cylinder. One side of the L-shaped plate is fixedly connected to the first protective cylinder, and one side of the side plate is fixedly connected to the second protective cylinder.

[0006] Furthermore, the rear end of the slide cylinder is fixedly connected to the side plate, and the slide cylinder is threadedly connected to the outer side of the lead screw.

[0007] Furthermore, the front end of the lead screw is fixedly connected to the striped handle, and the lead screw is movably connected to the L-shaped plate through a bearing, with the outer side of the striped handle in contact with the L-shaped plate.

[0008] It can be seen that the above technical solution is designed to facilitate the rotation of the lead screw.

[0009] Furthermore, one side of the limiting plate is fixedly connected to the sliding cylinder, and the other side of the limiting plate extends into the L-shaped plate.

[0010] As can be seen, in the above technical solution, the limiting plate restricts the rotation of the slide.

[0011] Furthermore, the rear side of the insert block is fixedly connected to the L-shaped plate, and a receiving sleeve is sleeved on the outer side of the insert block. One side of the receiving sleeve is fixedly connected to the mounting bracket, and the receiving sleeve and the insert block are fixed together by locking bolts.

[0012] Furthermore, the front side of the gasket is in contact with the photoelectric switch, and the rear side of the gasket is fixedly connected to the first protective cylinder.

[0013] As can be seen, in the above technical solution, the gasket can prevent the first protective cylinder from making rigid contact with the photoelectric switch.

[0014] Furthermore, guide plates are provided at the top and bottom of the L-shaped plate, and one side of each guide plate is fixedly connected to the mounting bracket.

[0015] As can be seen, in the above technical solution, the two guide plates can guide and limit the L-shaped plate.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. In this utility model, when the drum rotates, the disc drives multiple protrusions to rotate. When the protrusions enter the detection area, they trigger the photoelectric switch to generate a pulse signal. The signal processing system records the total number of pulses through a high-speed counter, calculates the number of drum rotations based on the number of protrusions on the disc, calculates the change in wire rope length based on the drum diameter, and finally obtains the hook height by combining the hook pulley block ratio. The operation is simple and convenient for calculating the hook height.

[0018] 2. This utility model drives the lead screw to rotate by rotating the striped handle, which in turn moves the side plate and the second protective cylinder backward. The distance between the second protective cylinder and the disc can be adjusted as needed. The locking bolt can be rotated and moved away from the receiving sleeve, thereby releasing the fixation between the insert block and the receiving sleeve. The first and second protective cylinders can then be disassembled and replaced. The structure is simple and easy to use. Attached Figure Description

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a perspective view of the present invention from a downward angle;

[0022] Figure 3 This is a schematic diagram of the mounting bracket and side plate assembly structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the protective component structure of this utility model.

[0024] In the diagram: 1. Mounting bracket; 2. Side plate; 3. Photoelectric switch; 4. Disc; 5. Protective assembly; 6. Receiving sleeve; 7. Guide plate; 501. First protective cylinder; 502. Second protective cylinder; 503. L-shaped plate; 504. Side plate; 505. Sliding cylinder; 506. Lead screw; 507. Limiting plate; 508. Striped handle; 509. Insert block; 510. Locking bolt; 511. Washer. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0026] Refer to the instruction manual appendix Figure 1-4 This embodiment of a crawler crane hook height sensor includes a mounting frame 1 and a disc 4, with the disc 4 located at the rear of the mounting frame 1. Multiple bosses are fixedly installed on the front of the disc 4. Side plates 2 are fixedly connected to both sides of the mounting frame 1. Photoelectric switches 3 are fixedly installed on the rear of both side plates 2. Protective components 5 are provided on both photoelectric switches 3. Each of the two protective components 5 includes a first protective cylinder 501, a second protective cylinder 502, an L-shaped plate 503, a side plate 504, a sliding cylinder 505, a lead screw 506, a limiting plate 507, a striped handle 508, an insert block 509, a locking bolt 510, and a washer 511. The second protective cylinder 502 is movably sleeved on the first protective cylinder 501. One side of the L-shaped plate 503 is fixedly connected to the first protective cylinder 501, and one side of the side plate 504 is fixedly connected to the second protective cylinder 502.

[0027] Furthermore, the rear end of the slide cylinder 505 is fixedly connected to the side plate 504, and the slide cylinder 505 is threadedly connected to the outer side of the lead screw 506. The front end of the lead screw 506 is fixedly connected to the striped handle 508, and the lead screw 506 is movably connected to the L-shaped plate 503 through a bearing. The outer side of the striped handle 508 is in contact with the L-shaped plate 503. One side of the limiting plate 507 is fixedly connected to the slide cylinder 505, and the other side of the limiting plate 507 extends into the L-shaped plate 503.

[0028] Furthermore, the rear side of the insert 509 is fixedly connected to the L-shaped plate 503, and the outer side of the insert 509 is fitted with a receiving sleeve 6. One side of the receiving sleeve 6 is fixedly connected to the mounting bracket 1, and the receiving sleeve 6 and the insert 509 are fixed together by a locking bolt 510. The front side of the gasket 511 is in contact with the photoelectric switch 3, and the rear side of the gasket 511 is fixedly connected to the first protective cylinder 501. The top and bottom of the L-shaped plate 503 are provided with guide plates 7, and one side of each guide plate 7 is fixedly connected to the mounting bracket 1.

[0029] Rotating the striped handle 508 drives the lead screw 506 to rotate. Since the lead screw 506 is threadedly connected to the slide cylinder 505, and the limiting plate 507 restricts the rotation of the slide cylinder 505, the lead screw 506 can drive the slide cylinder 505 to move backward, thereby driving the side plate 504 and the second protective cylinder 502 to move backward. Adjust the distance between the second protective cylinder 502 and the disc 4 as needed, rotate the locking bolt 510 and move it away from the receiving sleeve 6, thereby releasing the fixation between the insert block 509 and the receiving sleeve 6, and disassemble and replace the first protective cylinder 501 and the second protective cylinder 502. The structure is simple and easy to use. Similarly, the first protective cylinder 501 is installed, and the gasket 511 can prevent the first protective cylinder 501 from rigidly contacting the photoelectric switch 3. At the same time, the two guide plates 7 can guide and limit the L-shaped plate 503.

[0030] The usage method of this embodiment is as follows:

[0031] In use, the disc 4 is mounted on the winch drum shaft of the tower crane using fixing bolts, ensuring that the disc 4 rotates synchronously with the drum. The disc 4 is also mounted on the tower crane base using fixing bolts. When the drum rotates, the disc 4 drives multiple protrusions to rotate, activating the photoelectric switch 3. When a protrusion enters the detection area, it triggers the photoelectric switch 3 to generate a pulse signal. The two photoelectric switches 3 are arranged in orthogonal phase, which not only accurately detects the number of protrusions through pulse counting but also determines the forward and reverse rotation direction of the drum through signal phase difference, providing a directional reference for height calculation. The signal processing system records the total number of pulses using a high-speed counter, combined with the number of protrusions on the disc 4. The number of drum rotations is calculated, and the change in wire rope length is calculated based on the drum diameter. Finally, the hook height is determined by combining the hook pulley block ratio. At the same time, the first protective cylinder 501 and the second protective cylinder 502 work together to shield ambient stray light, thereby reducing false triggering caused by direct strong light. The operation is simple and convenient for calculating the hook height. It is worth noting that the photoelectric switch 3 is a diffuse reflection type photoelectric switch. The beam emitted by the transmitter shines on the surface of the boss, and the boss reflects part of the light back to the receiver through diffuse reflection. When there is no boss, the receiver only receives weak background light. When an object enters the detection area, the intensity of diffuse reflection light increases, triggering the switch.

[0032] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are existing technologies, and will not be described here.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hook height sensor for a crawler crane, comprising a mounting frame (1) and a disc (4), wherein the disc (4) is located on the rear side of the mounting frame (1), characterized in that: Multiple bosses are fixedly installed on the front side of the disc (4). Side plates (2) are fixedly connected to both sides of the mounting bracket (1). Photoelectric switches (3) are fixedly installed on the rear side of the two side plates (2). Protective components (5) are provided on the two photoelectric switches (3). The two protective components (5) include a first protective cylinder (501), a second protective cylinder (502), an L-shaped plate (503), a side plate (504), a slide cylinder (505), a lead screw (506), a limiting plate (507), a striped handle (508), a plug (509), a locking bolt (510), and a gasket (511). The second protective cylinder (502) is movably sleeved on the first protective cylinder (501). One side of the L-shaped plate (503) is fixedly connected to the first protective cylinder (501), and one side of the side plate (504) is fixedly connected to the second protective cylinder (502).

2. The hook height sensor for a crawler crane according to claim 1, characterized in that: The rear end of the slide cylinder (505) is fixedly connected to the side plate (504), and the slide cylinder (505) is threadedly connected to the outer side of the lead screw (506).

3. The hook height sensor for a crawler crane according to claim 1, characterized in that: The front end of the lead screw (506) is fixedly connected to the striped handle (508), and the lead screw (506) is movably connected to the L-shaped plate (503) through a bearing. The outer side of the striped handle (508) is in contact with the L-shaped plate (503).

4. The hook height sensor for a crawler crane according to claim 1, characterized in that: One side of the limiting plate (507) is fixedly connected to the slide cylinder (505), and the other side of the limiting plate (507) extends into the L-shaped plate (503).

5. The hook height sensor for a crawler crane according to claim 1, characterized in that: The rear side of the insert (509) is fixedly connected to the L-shaped plate (503). The outer side of the insert (509) is fitted with a receiving sleeve (6). One side of the receiving sleeve (6) is fixedly connected to the mounting bracket (1), and the receiving sleeve (6) and the insert (509) are fixed together by a locking bolt (510).

6. The hook height sensor for a crawler crane according to claim 1, characterized in that: The front side of the gasket (511) is in contact with the photoelectric switch (3), and the rear side of the gasket (511) is fixedly connected to the first protective cylinder (501).

7. The hook height sensor for a crawler crane according to claim 1, characterized in that: The L-shaped plate (503) is provided with guide plates (7) at the top and bottom, and one side of each guide plate (7) is fixedly connected to the mounting bracket (1).

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