Safety limiting device of crane

Abstract

The utility model relates to a crane safety limiting device, which belongs to the technical field of cranes and comprises a mounting plate and a lifting hook body arranged at the bottom of the mounting plate, a steel wire rope is arranged between the lifting hook body and the mounting plate, and a limiting monitoring mechanism capable of limiting the steel wire rope is arranged at the bottom of the mounting plate. And the limiting monitoring mechanism comprises a limiting block arranged at the bottom of the mounting plate, the steel wire rope penetrates through the limiting block and is in sliding connection with the limiting block, and a positioning roller is rotationally connected into the limiting block. According to the crane safety limiting device, by arranging the limiting block and the positioning roller, a steel wire rope can slide in the limiting block, and by arranging the encoder device, the number of turns of rotation of the positioning roller can be transmitted to the encoder device, so that the lifting height of the steel wire rope can be conveniently monitored; and therefore, a worker can conveniently control the lifting movement of the steel wire rope, the worker does not need to observe with naked eyes, and the accuracy of the lifting height is improved.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to a crane safety limit device. Background Technology

[0002] Cranes, also known as hoists, are material handling machinery that completes loading and unloading operations or equipment installation through repetitive, short work cycles. One work cycle includes picking up the object, raising the load, moving it horizontally, lowering it, unloading it, and then returning the empty crane to its original position. They are widely used in industries such as metallurgy, ports, machinery manufacturing, logistics, power, mining, industry, construction engineering, and marine engineering, playing a vital role in cargo handling, equipment installation, and construction.

[0003] Safety limiting devices are required during the use of cranes. Chinese utility model patent CN212269244U discloses a crane hook suspension safety limiting device, including a mounting box, a lifting rope, and a hook, as well as a limiting block. Nut seats are symmetrically installed on both sides of the limiting block's interior. A screw is installed at the bottom of the mounting box, and the nut seats are mounted on the screw to limit the vertical movement of the limiting block. The limiting block has a through hole for the lifting rope to pass through, and an air bladder coaxial with the through hole is installed at the bottom of the mounting box. In this utility model, by setting an adjustable limiting block that follows the hook, the minimum distance between the hook and the limiting block is achieved. The limiting block moves vertically along a vertical screw, the length of which is greater than half the maximum extension height of the lifting rope. This significantly shortens the distance between the limiting block and the hook, reducing the amplitude of the hook's suspension swing and improving the safety of hook use.

[0004] However, this utility model can only prevent the hook and rope from swinging back and forth during use, but it cannot limit the height of the hook, which will lead to excessive stretching of the wire rope, posing a safety hazard to the workers below and failing to meet production needs. Therefore, a crane safety limit device is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a crane safety limit device, which has the advantage of easily limiting the height of the hook. It solves the problem that while it can prevent the hook and rope from swinging back and forth, it cannot limit the height of the hook, which can lead to excessive stretching of the wire rope, posing a safety hazard to workers below and failing to meet production needs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a crane safety limit device, including a mounting plate and a hook body disposed at the bottom of the mounting plate, wherein a wire rope is disposed between the hook body and the mounting plate, and a limit monitoring mechanism capable of limiting the wire rope is disposed at the bottom of the mounting plate;

[0007] The limit monitoring mechanism includes a limit block disposed at the bottom of the mounting plate, a steel wire rope passing through the limit block and slidably connected thereto, a positioning roller rotatably connected inside the limit block, the positioning roller being slidably connected to the steel wire rope, and an encoder device fixedly installed at the bottom of the limit block.

[0008] Furthermore, a movable pulley is installed on the top of the hook body, the wire rope is connected to the movable pulley for transmission, and a fixed base is fixedly connected to the bottom of the mounting plate, the fixed base being fixedly connected to one end of the wire rope.

[0009] Furthermore, there are two positioning rollers, which are symmetrically distributed on the left and right sides of the wire rope, and the rotating shaft of the encoder device is fixedly connected to the rotating shaft of the positioning rollers.

[0010] Furthermore, a mounting box is fixedly connected to the bottom of the mounting plate, and two mounting plate support plates are fixedly connected to the lower surface of the mounting box. A reciprocating screw is rotatably connected between the two mounting plate support plates, and a threaded sleeve is connected to the external thread of the reciprocating screw.

[0011] Furthermore, a positioning guide rod is fixedly connected between the two mounting plate support plates, and a positioning sleeve is slidably connected to the outside of the positioning guide rod. The limiting block is fixedly connected to the positioning sleeve.

[0012] Furthermore, a connecting block is fixedly connected between the threaded sleeve and the positioning sleeve, and a driven gear capable of driving the reciprocating screw to rotate is rotatably connected to one side of the mounting plate support plate.

[0013] Furthermore, a drive motor is fixedly installed at the bottom of the mounting plate, and a transmission gear is fixedly connected to the output shaft of the drive motor. A winding drum is rotatably connected inside the mounting box, and the wire rope is wound around the outside of the winding drum.

[0014] Furthermore, the transmission gear meshes with the driven gear, an opening is provided on the lower surface of the mounting box, and one end of the transmission gear is fixedly connected to one end of the winding drum.

[0015] Compared with the prior art, the present invention provides a crane safety limit device, which has the following advantages:

[0016] 1. The crane safety limit device, by setting a limit block and a positioning roller, allows the wire rope to slide inside the limit block. By setting an encoder device, the number of rotations of the positioning roller can be transmitted to the encoder device, which facilitates the monitoring of the lifting height of the wire rope. This allows the operator to easily control the lifting and moving of the wire rope without having to observe it with the naked eye, thus improving the accuracy of the lifting height.

[0017] 2. The crane safety limit device uses a drive motor to rotate the transmission gear and the driven gear simultaneously. This allows the driven gear to drive the reciprocating screw to rotate, which in turn allows the threaded sleeve and the limit block to reciprocate simultaneously. This makes the wire rope winding and unwinding more uniform and stable. It solves the problem that while it can prevent the hook and rope from swinging back and forth, it cannot limit the height of the hook, which can lead to excessive stretching of the wire rope, creating a safety hazard for workers below and failing to meet production needs. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 2 This is a three-dimensional view of the limiting block of this utility model;

[0020] Figure 3 This is a schematic diagram of the positioning roller of this utility model;

[0021] Figure 4 This utility model Figure 1 A magnified structural diagram of structure A is shown.

[0022] In the diagram: 1 Mounting plate, 2 Hook body, 3 Wire rope, 4 Moving pulley, 5 Limit block, 6 Positioning roller, 7 Encoder device, 8 Mounting box, 9 Support plate, 10 Reciprocating screw, 11 Threaded sleeve, 12 Positioning guide rod, 13 Connecting block, 14 Driven gear, 15 Drive motor, 16 Transmission gear, 17 Winding drum, 18 Fixed seat. Detailed Implementation

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

[0024] Please see Figures 1 to 3The crane safety limit device in this embodiment includes a mounting plate 1 and a hook body 2 disposed at the bottom of the mounting plate 1. A wire rope 3 is disposed between the hook body 2 and the mounting plate 1. A limit monitoring mechanism capable of limiting the wire rope 3 is disposed at the bottom of the mounting plate 1. The limit monitoring mechanism includes a limit block 5 disposed at the bottom of the mounting plate 1. The wire rope 3 passes through the limit block 5 and is slidably connected to it. A positioning roller 6 is rotatably connected inside the limit block 5. The positioning roller 6 is slidably connected to the wire rope 3. An encoder device 7 is fixedly installed at the bottom of the limit block 5.

[0025] Specifically, a movable pulley 4 is installed on the top of the hook body 2, and the wire rope 3 is connected to the movable pulley 4 for transmission. A fixed seat 18 is fixedly connected to the bottom of the mounting plate 1. The fixed seat 18 is fixedly connected to one end of the wire rope 3. There are two positioning rollers 6, which are symmetrically distributed on the left and right sides of the wire rope 3.

[0026] It should be noted that the rotating shaft of the encoder device 7 is fixedly connected to the rotating shaft of the positioning roller 6. When the roller is connected to the rotating shaft of the encoder, the encoder will output a certain number of pulses corresponding to the circumference of the roller for each rotation of the roller. By counting these pulses, the number of rotations of the roller can be accurately known, and the lifting height of the wire rope 3 can be easily calculated.

[0027] Please see Figure 1 and Figure 2 In this embodiment, a mounting box 8 is fixedly connected to the bottom of the mounting plate 1, and two support plates 9 are fixedly connected to the lower surface of the mounting box 8. A reciprocating screw 10 is rotatably connected between the two support plates 9, and a threaded sleeve 11 is threadedly connected to the external thread of the reciprocating screw 10. A positioning guide rod 12 is fixedly connected between the two support plates 9, and a positioning sleeve is slidably connected to the external thread of the positioning guide rod 12. The limiting block 5 is fixedly connected to the positioning sleeve.

[0028] Specifically, a connecting block 13 is fixedly connected between the threaded sleeve 11 and the positioning sleeve, and a driven gear 14 that can drive the reciprocating screw 10 to rotate is rotatably connected to one side of the support plate 9.

[0029] It should be noted that by setting the drive motor 15 to drive the transmission gear 16 and the driven gear 14 to rotate simultaneously, the driven gear 14 can drive the reciprocating screw 10 to rotate, thereby enabling the threaded sleeve 11 and the limit block 5 to reciprocate simultaneously. This makes the wire rope 3 more evenly and stably wound and unwound.

[0030] It should be noted that the reciprocating lead screw 10 has a special helical groove on its screw surface, and its cross-sectional shape is usually trapezoidal or rectangular. Unlike ordinary lead screws, its helical groove has a reverse helical structure within a certain length. That is, when the lead screw rotates, the nut can not only move in a straight line in one direction, but also return in the opposite direction after reaching a specific position, thus realizing reciprocating motion. The threaded sleeve 11 is a ball screw sleeve.

[0031] Please see Figure 1 and Figure 4 In this embodiment, a drive motor 15 is fixedly installed at the bottom of the mounting plate 1, and a transmission gear 16 is fixedly connected to the output shaft of the drive motor 15. A winding drum 17 is rotatably connected inside the mounting box 8, and the wire rope 3 is wound around the outside of the winding drum 17.

[0032] Specifically, the transmission gear 16 meshes with the driven gear 14, and an opening is provided on the lower surface of the mounting box 8. One end of the transmission gear 16 is fixedly connected to one end of the winding drum 17.

[0033] It should be noted that the encoder device 7 is connected to the drive motor 15 by signal. The drive motor 15 drives the transmission gear 16 and the driven gear 14 to rotate, which can realize the linkage effect of the reciprocating screw 10 and the take-up drum 17. When the take-up drum 17 and the reciprocating screw 10 rotate at the same time.

[0034] The working principle of the above embodiments is as follows:

[0035] First, the operator starts the drive motor 15, which simultaneously drives the transmission gear 16 and the driven gear 14 to rotate. At this time, the driven gear 14 drives the reciprocating screw 10 to rotate. During the drive process of the drive motor 15, the wire rope 3 is unloaded. At this time, the wire rope 3 drives the positioning roller 6 to rotate. During the rotation of the positioning roller 6, the number of rotations is transmitted to the encoder device 7. When the number of rotations of the positioning roller 6 reaches the preset value in the encoder device 7, the drive motor 15 stops working. At this time, the effect of limiting the lifting height of the wire rope can be achieved.

[0036] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that achieves the desired beneficial effect can be implemented. Furthermore, all electrical components in this embodiment are electrically connected to the main controller and power supply. The main controller can be a conventional, known device such as a computer that performs control functions. Those skilled in the art can control the electrical components through simple programming, and the existing disclosed power connection technologies are common knowledge in the field. Therefore, this embodiment will not elaborate further on their specific structural composition and working principles.

[0037] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safety limiter for a crane, comprising a mounting plate (1) and a hook body (2) arranged at the bottom of the mounting plate (1), characterized in that: A steel wire rope (3) is arranged between the hook body (2) and the mounting plate (1), and the bottom of the mounting plate (1) is provided with a limiting monitoring mechanism capable of limiting the steel wire rope (3). The limiting monitoring mechanism comprises a limiting block (5) arranged at the bottom of the mounting plate (1), the steel wire rope (3) penetrates through the limiting block (5) and is in sliding connection with the limiting block (5), the limiting block (5) is rotatably connected with a positioning roller (6) in the inside, the positioning roller (6) is in sliding connection with the steel wire rope (3), and the bottom of the limiting block (5) is fixedly connected with an encoder device (7).

2. Crane safety limiter according to claim 1, characterized in that: The top of the hook body (2) is provided with a movable pulley (4), the steel wire rope (3) is in transmission connection with the movable pulley (4), the bottom of the mounting plate (1) is fixedly connected with a fixing seat (18), and one end of the steel wire rope (3) is fixedly connected with the fixing seat (18).

3. Crane safety limiter according to claim 1, characterized in that: The number of the positioning rollers (6) is two, and the two positioning rollers (6) are symmetrically arranged on the left and right sides of the steel wire rope (3), and the rotating shaft of the encoder device (7) is fixedly connected with the rotating shaft of the positioning roller (6).

4. Crane safety limiter according to claim 1, characterized in that: The bottom of the mounting plate (1) is fixedly connected with a mounting box (8), the lower surface of the mounting box (8) is fixedly connected with two supporting plates (9), the two supporting plates (9) are rotatably connected with a reciprocating screw (10), and the outer portion of the reciprocating screw (10) is threadedly connected with a threaded sleeve (11).

5. Crane safety limiter according to claim 4, characterized in that: The two supporting plates (9) are fixedly connected with a positioning guide rod (12), the outer portion of the positioning guide rod (12) is slidably connected with a positioning sleeve, and the limiting block (5) is fixedly connected with the positioning sleeve.

6. Crane safety limiter according to claim 5, characterized in that: The threaded sleeve (11) and the positioning sleeve are fixedly connected with a connecting block (13), and one side of the supporting plate (9) is rotatably connected with a driven gear (14) capable of driving the reciprocating screw (10) to rotate.

7. Crane safety limiter according to claim 4, characterized in that: The bottom of the mounting plate (1) is fixedly connected with a driving motor (15), the output shaft of the driving motor (15) is fixedly connected with a transmission gear (16), the inside of the mounting box (8) is rotatably connected with a winding drum (17), and the steel wire rope (3) is wound on the outer portion of the winding drum (17).

8. Crane safety limiter according to claim 7, characterized in that: The transmission gear (16) is engaged with the driven gear (14), the lower surface of the mounting box (8) is provided with an opening, and one end of the transmission gear (16) is fixedly connected with one end of the winding drum (17).

Images