Safety monitoring device for measuring crane hook by using stay wire encoder
By installing a wire encoder on the crane electric hoist and measuring the hook height by using the movement of the rope guide, the problem of inaccurate measurement of the hook height in the prior art is solved, and accurate safety monitoring of the crane hook height is achieved.
Patent Information
- Application Number
- CN202422050913.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The prior art cannot accurately measure the ground height of the crane hook, especially when the operator cannot see the hook position, resulting in untimely safety monitoring.
A safety monitoring device that uses a wire pull encoder to measure the height of the hook is used to measure the position of the wire pulling rope by the wire pulling encoder installed on the electric hoist frame, thereby calculating the height of the hook.
Accurate monitoring of the height of the crane hook is achieved, and the safety of the crane is enhanced. There is no need to modify the existing electric hoist, which is easy to install and has strong versatility.
Smart Images
Figure CN222974687U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cranes, in particular to a safety monitoring device for measuring the crane hook by using a wire-pulling encoder. Background Technique
[0002] A crane, commonly known as a gantry crane or a bridge crane, mainly consists of a bridge frame, a trolley traveling mechanism, a crab traveling mechanism, an electric hoist, a steel wire rope and a hook, etc. The electric hoist is one of the important accessories inside the crane. When the crane is working, the electric hoist controls the retraction and release of the steel wire rope of the crane. In order to ensure that the steel wire rope is wound on the drum groove in an orderly manner, a wire guide is installed on the electric hoist to ensure that the steel wire rope can be retracted and released outside the electric hoist in an orderly manner. As the hook rises and falls, the wire guide moves along the axial direction of the steel wire rope at the drum.
[0003] With the improvement of the safety monitoring requirements of cranes, when the electric hoist of the crane is working, it is necessary to measure the height of the hook from the ground during work to realize the monitoring of the safety state of the crane. In the prior art, the height of the hook from the ground is not displayed or the display is inaccurate. The height of the hook from the ground is mainly visually estimated by the operator according to experience. However, for some special working conditions, the operator cannot see the position of the hook and has no idea about the height of the hook at all.
[0004] There are two traditional measurement methods: 1. Install a coaxial encoder at the end of the drum to measure the number of turns of the drum and calculate the rope length. This method requires that the encoder can be coaxially installed on one side of the drum. For some working conditions, the encoder cannot be coaxially installed on both sides, and the coaxiality requirement is relatively high; 2. Install a gear ring on the side of the drum, and use orthogonal signals to calculate the forward and reverse signals and pulse numbers of the electric hoist to calculate the rope length. This method requires designing a gear ring on the side of the electric hoist structure. For an electric hoist without a gear ring structure, an orthogonal signal sensor cannot be installed. Content of the Utility Model
[0005] Aiming at the deficiencies of the prior art, the utility model provides a safety monitoring device for measuring the crane hook by using a wire-pulling encoder.
[0006] The utility model is realized by the following technical solutions: a safety monitoring device for measuring the crane hook by using a wire-pulling encoder is provided, which includes a wire-pulling encoder installed on the frame of the electric hoist. The pulling rope head of the wire-pulling encoder is connected to the wire guide, and the pulling rope of the wire-pulling encoder is parallel to the moving direction of the wire guide. The wire-pulling encoder is arranged outside the end face of the drum.
[0007] As the lifting hook rises and falls, the wire rope guide moves axially along the drum, and the rope head of the wire rope encoder follows the wire rope guide, so as to measure the position of the wire rope guide through the wire rope encoder, and then obtain the height of the lifting hook. The wire rope encoder is arranged outside the end face of the drum, so that when the wire rope guide moves to the end of the drum, it will not interfere with the wire rope encoder.
[0008] As an optimization, the wire rope encoder is fixedly connected to the encoder mounting bracket. The encoder mounting bracket is connected to the electric hoist frame through bolts, and the bolt connection holes on the encoder mounting bracket are vertical long holes. In this solution, the wire rope encoder is installed through the encoder mounting bracket. The bolt connection holes are vertical long holes, and the height of the encoder mounting bracket can be adjusted to ensure the parallelism between the wire rope and the axis of the drum.
[0009] As an optimization, the encoder mounting bracket includes a connecting part, an extending part and a mounting part connected in sequence. The connecting part is connected to the electric hoist frame, the extending part extends in a direction away from the wire rope guide, and the mounting part is connected to the wire rope encoder. The extending part provided in this solution facilitates the installation of the wire rope encoder to ensure that the wire rope encoder is arranged outside the end face of the drum.
[0010] As an optimization, the rope head of the wire rope encoder is detachably and fixedly connected to the rope connection bracket through a fixing mechanism, and the rope connection bracket is connected to the wire rope guide through bolts. The rope connection bracket in this solution realizes the connection between the rope head and the wire rope guide.
[0011] As an optimization, the fixing mechanism includes at least three pressing bolt plates arranged circumferentially along the wire rope, and pressing bolts pressing against the side surface of the rope head are connected to the pressing bolt plates. In this solution, at least three pressing bolts press against the side surface of the rope head, so as to fix the rope head. At the same time, adjusting the positions of multiple pressing bolts can finely adjust the position of the rope head to ensure the parallelism between the wire rope and the axis of the drum.
[0012] The beneficial effects of the present utility model are as follows: A safety monitoring device for measuring the crane lifting hook using a wire rope encoder according to the present utility model measures the position of the wire rope guide through the wire rope encoder by the rope head of the wire rope encoder following the wire rope guide, and then obtains the height of the lifting hook, realizing the safety monitoring of the lifting hook height. The present utility model does not need to modify the existing electric hoist, is convenient to install, and has strong versatility. Description of the Drawings
[0013] Figure 1 It is the front view of the present utility model;
[0014] Figure 2 It is the front view of the encoder mounting bracket and the wire rope encoder of the present utility model;
[0015] Figure 3It is the side view of the encoder mounting bracket of the present utility model;
[0016] Figure 4 It is the front view of the cable connection bracket of the present utility model;
[0017] Figure 5 It is the side view of the cable connection bracket of the present utility model;
[0018] As shown in the figure:
[0019] 1. Electric hoist frame body, 2. Lifting motor, 3. Drum, 4. Rope guide, 5. Steel wire rope, 6. Hook, 7. Pull-wire encoder, 8. Encoder mounting bracket, 81. Connection part, 82. Extension part, 83. Mounting part, 9. Cable connection bracket, 10. Pulling rope, 11. Bolt connection hole, 12. Pulling rope head, 13. Compression bolt plate, 14. Compression bolt. Specific implementation mode
[0020] To clearly illustrate the technical features of this solution, the following is an elaboration of this solution through specific implementation modes.
[0021] As Figures 1 to 5 shown, a safety monitoring device for measuring the crane hook using a pull-wire encoder of the present utility model includes a pull-wire encoder 7 installed on the electric hoist frame body 1. The drum is rotatably connected to the electric hoist frame body 1, and the drum is rotated by the lifting motor 2. Both ends of the drum are rotatably connected to the electric hoist frame body 1 through bearings. The lifting motor 2 is installed at one end of the drum, and the pull-wire encoder 7 is installed at the other end of the drum.
[0022] The end of the pull rope 10 of the pull-wire encoder 7 is provided with a pull rope head 12. The pull rope head is generally a metal part used to connect with the workpiece to be measured. In this solution, the pull rope head 12 of the pull-wire encoder 7 is connected to the rope guide 4, and the pull rope 10 of the pull-wire encoder 7 is parallel to the moving direction of the rope guide 4, so as to accurately measure the position of the rope guide 4.
[0023] To ensure that the rope guide does not interfere with the pull-wire encoder when it moves to the end of the drum, the pull-wire encoder 7 is arranged outside the end face of the drum 3.
[0024] The pull-wire encoder 7 is fixedly connected to the encoder mounting bracket 8. The encoder mounting bracket 8 is connected to the electric hoist frame body 1 by bolts, and the bolt connection holes 11 on the encoder mounting bracket 8 are vertical long holes, so that the height position of the encoder mounting bracket 8 can be adjusted. In this embodiment, the encoder mounting bracket 8 is installed at the lower end position of the electric hoist frame body 1.
[0025] As Figure 2As shown in the figure, the encoder mounting bracket 8 includes a connecting portion 81, an extending portion 82, and a mounting portion 83 that are connected in sequence. The connecting portion 81 is connected to the electric hoist frame 1. The extending portion 82 extends in a direction away from the rope guide 4. The mounting portion 83 is connected to the wire rope encoder 7. The connecting portion 81 is arranged vertically, and the bolt connection holes 11 are provided on the connecting portion 81, so that the connecting portion 81 is mounted on the side position of the electric hoist frame 1.
[0026] The mounting portion 83 is arranged vertically. The side of the wire rope encoder 7 is connected to the mounting portion 83 by bolts. The extending portion 82 is arranged horizontally and is located below the electric hoist frame 1.
[0027] The rope head 12 of the wire rope encoder 7 is detachably fixed to the rope connection bracket 9 through a fixing mechanism. The rope connection bracket 9 is connected to the rope guide 4 by bolts. The rope connection bracket 9 is a vertical plate and is fixed to the side of the rope guide 4 by bolts. The fixing mechanism is used to fix the rope head 12 on the one hand and to fine-tune the position of the rope head 12 on the other hand to ensure the parallelism of the wire rope and the axis of the drum.
[0028] As Figure 4 、 5 shown in the figure, the fixing mechanism includes at least three pressing bolt plates 13 arranged circumferentially along the wire rope 10. A pressing bolt 14 that presses against the side of the rope head 12 is connected to the pressing bolt plate 13. The axis of the pressing bolt 14 is perpendicular to the wire rope 10. In this embodiment, four pressing bolt plates 13 are provided, so that the rope head 12 is clamped and fixed by four pressing bolts 14. Adjusting the positions of the four pressing bolts can fine-tune the position of the rope head to ensure the parallelism of the wire rope and the axis of the drum.
[0029] The usage method of the present utility model: When the crane is working, the lifting motor 2 drives the drum 3 to rotate, winds the steel wire rope 5 on the drum, and realizes the lifting and lowering of the hook 6. The steel wire rope can be neatly arranged on the drum through the rope guide 4 to prevent the steel wire rope from being disordered, overlapping, etc.
[0030] As the hook 6 is lifted and lowered, the rope guide 4 moves along the axial direction of the drum. The rope head 12 of the wire rope encoder 7 follows the rope guide 4 to move. Thus, the position of the rope guide 4 is measured by the wire rope encoder 7, and the height of the hook is obtained, realizing the safety monitoring of the hook height.
[0031] Certainly, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopted from the prior art, and will not be elaborated here. The above embodiments and accompanying drawings are only used to illustrate the technical solutions of the present utility model and are not a limitation to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the technical field within the essence of the present utility model do not depart from the purpose of the present utility model and should also fall within the scope of protection of the claims of the present utility model.
Claims
1. A safety monitoring device for measuring a crane hook using a draw-wire encoder, characterized in that: The invention comprises a wire-drawing encoder (7) mounted on an electric hoist frame (1), wherein a wire-drawing head (12) of the wire-drawing encoder (7) is connected to a rope guide (4), a wire-drawing rope (10) of the wire-drawing encoder (7) is parallel to the moving direction of the rope guide (4), and the wire-drawing encoder (7) is arranged outside the end surface of a drum (3).
2. A safety monitoring device for measuring a crane hook using a draw wire encoder according to claim 1, characterized in that: The wire encoder (7) is fixedly connected to an encoder mounting bracket (8), the encoder mounting bracket (8) is connected to the electric hoist frame (1) via bolts, and the bolt connection hole (11) on the encoder mounting bracket (8) is a vertical long hole.
3. A safety monitoring device for measuring a crane hook using a draw-wire encoder according to claim 2, characterized in that: The encoder mounting bracket (8) comprises a connecting portion (81), an extending portion (82) and a mounting portion (83) which are connected in sequence, the connecting portion (81) being connected to the electric hoist frame (1), the extending portion (82) extending in a direction away from the rope guide (4), and the mounting portion (83) being connected to the wire encoder (7).
4. A safety monitoring device for measuring a crane hook using a draw-wire encoder according to claim 1, characterized in that: The draw rope head (12) of the draw rope encoder (7) is detachably fixed to the draw rope connection bracket (9) via a fixing mechanism, and the draw rope connection bracket (9) is connected to the rope guide (4) via bolts.
5. A safety monitoring device for measuring a crane hook using a draw-wire encoder according to claim 4, characterized in that: The fixing mechanism comprises at least three clamping bolt plates (13) arranged along the circumference of the pull rope (10), and the clamping bolt plates (13) are connected to clamping bolts (14) which are clamped on the side of the pull rope head (12).