A belt anti-reverse alarm device suitable for a crown block

Abstract

The utility model discloses a kind of suitable for overhead travelling crane belt anti-reverse alarm device, belong to hoisting equipment technical field, the technical problem to be solved is that overhead travelling crane belt reverse causes goods to fall and safety accident, existing brake and alarm device have defects, the device main point includes: support track is equipped with slidable moving box, winding component and transmission assembly are equipped in moving box, transmission assembly is fixed with inclined plane baffle at equal interval and inclination;Check valve component is installed on the side of protective cover, check wheel and inclined plane baffle one-way clamping cooperation, pressure sensor is equipped in check wheel, the device blocks reverse inclined plane baffle by check wheel, prevents synchronous belt reverse movement, pressure sensor triggers alarm, electric push rod controls check wheel position, moving box can slide and adapt to operation requirement, effectively solve the brake and alarm defects of prior art.

Description

Technical Field

[0001] This utility model relates to the field of lifting equipment technology, and in particular to an alarm device for preventing reverse rotation of overhead crane belts. Background Technology

[0002] During the operation of overhead cranes (bridge cranes), the overhead crane belt or wire rope system undertakes the important task of lifting and transporting goods. Under normal operation, the overhead crane belt or wire rope is wound and unwound by a winch device, thereby driving the goods up or down. However, in actual application scenarios, due to various factors such as uneven weight of goods, equipment aging, and improper operation, the overhead crane belt or wire rope may slip and reverse. Reversal of the overhead crane belt or wire rope can not only cause goods to fall, resulting in damage to goods and economic losses, but may also pose a serious threat to the operators and equipment below the overhead crane, causing safety accidents. For example, in construction sites, factory workshops, and other places, there are usually workers performing various operations below the overhead crane. If the overhead crane belt reverses and causes goods to fall, the consequences are unimaginable. To address the safety hazards caused by belt reversal in overhead cranes, existing technical solutions mainly focus on reinforcing the mechanical structure and using simple limit devices. Some traditional overhead crane systems prevent belt reversal by adding braking devices, but these braking devices can usually only slow down the reversal speed to a certain extent and cannot completely prevent reversal. Moreover, after prolonged use, the braking devices are prone to wear, leading to a decrease in braking effectiveness. In addition, some overhead crane systems use simple limit switches that trigger an alarm when the belt reversal reaches a certain degree, but this solution has the problem of delayed response and cannot issue an alarm in time at the initial stage of reversal, thus failing to effectively prevent accidents. To address the aforementioned problems, this technical solution proposes an anti-reverse rotation alarm device suitable for overhead crane belts. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing overhead crane belt anti-reverse alarm devices, which cause cargo to fall and safety accidents due to belt reversal.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A device for preventing reverse rotation of overhead crane belts includes: Support track; The movable box is slidably connected to the supporting rail; A winding component is disposed inside the movable box. The winding component includes a rotating shaft, a reel fixedly sleeved on the rotating shaft, and a wire rope wound around the reel. A transmission assembly is connected to the winding component. The transmission assembly includes a timing belt and multiple inclined baffles that are equally spaced and inclinedly fixed to the timing belt. A protective cover is fixedly installed on one side of the mobile box, and the transmission component is located inside the protective cover; A check valve component is installed on one side of the protective cover. The check valve component includes an electric push rod, a support plate driven by the electric push rod and located inside the protective cover, a mounting bracket installed on the support plate, and a stop wheel rotatably connected to the mounting bracket. A pressure sensor is provided inside the stop wheel. The wheel surface of the guide wheel slides in conjunction with the inclined surface of the inclined baffle. When the wire rope is wound up, the inclined baffle moves with the synchronous belt and pushes the guide wheel to make way. When the wire rope shows a tendency to reverse, the back of the inclined baffle abuts against the guide wheel to stop its movement and triggers an alarm by the pressure sensor.

[0005] In one possible design, servo motors are fixedly installed on both sides of the mobile box, the output shafts of the servo motors extend into the mobile box and are fixedly installed with drive gears, and two racks that mesh with the drive gears are symmetrically fixedly installed on the support rail.

[0006] In one possible design, the device further includes a winch motor fixedly installed inside the mobile housing, and the transmission assembly is connected between the output shaft of the winch motor and the rotating shaft.

[0007] In one possible design, the transmission assembly further includes a first synchronous pulley fixedly mounted on the output shaft of the hoist motor and a second synchronous pulley fixedly mounted on one end of the shaft, with the synchronous belt drive sleeved on the first synchronous pulley and the second synchronous pulley.

[0008] In one possible design, the check valve further includes a support assembly comprising two parallel support rods that pass through the support plate and are slidably connected to it. One end of each support rod is fixedly connected to the mounting bracket, and a compression spring is sleeved on the support rod between the mounting bracket and the support plate.

[0009] In one possible design, a support bracket is slidably connected to the bottom of the support plate, and the support bracket is fixed to the inner wall of the protective cover.

[0010] In one possible design, the pressure sensor is electrically connected to a buzzer via a controller. When the back of the inclined baffle abuts against the stop wheel, the signal generated by the pressure sensor triggers the buzzer to sound an alarm via the controller.

[0011] In one possible design, the bottom of the mobile box has an opening through which the steel wire rope passes.

[0012] In this application, during use, the electric push rod is first activated, and its output shaft pushes the support plate to slide horizontally on the support bracket. The support plate drives the support assembly to move, and the two support rods in the support assembly cause the mounting frame to move accordingly. This moves the retaining wheel in the mounting frame to a position where it can engage with multiple inclined baffles. Then, the winch motor is activated, and its output shaft drives the first synchronous pulley to rotate. Under the transmission of the synchronous belt, the second synchronous pulley rotates accordingly, thereby driving the rotating shaft to rotate. The winding shaft on the rotating shaft also rotates, realizing the winding of the steel wire rope wound on the winding shaft. The goods connected to the bottom end of the steel wire rope are lifted upward. During this process, the inclined baffles, which are evenly spaced and fixedly installed on the synchronous belt, move with the synchronous belt. When the inclined baffles contact the retaining wheels, they push the retaining wheels to move closer to the support plate, causing the compression springs on the two support rods to be compressed. When the inclined baffles disengage from the retaining wheels, the compressed springs under stress drive the mounting frame to rotate. The rack is reversed and reset, allowing the guide wheel to drive the next inclined baffle. If the weight of the cargo causes the timing belt to slip, multiple inclined baffles will move in the opposite direction with the timing belt. At this time, the guide wheel will block the corresponding inclined baffle, preventing the timing belt from moving in the opposite direction. At the same time, the inclined baffles apply pressure to the guide wheel, causing the pressure sensor inside the guide wheel to be pressurized. The pressure sensor activates an external buzzer through the controller to prompt the staff to perform maintenance. When it is necessary to lower the cargo, the electric push rod is activated to move the support plate away from the timing belt, causing the guide wheel to move out of the position where it is disengaged from the multiple inclined baffles. Then, the winch motor is controlled to reverse, and the wire rope is unwound and the cargo descends according to the reverse transmission process. To move the moving box, the servo motors on both sides of the moving box are activated, and their output shafts drive the drive gear to rotate. Since the drive gear meshes with the rack on the support rail, the moving box slides on the support rail. Beneficial effects

[0013] 1. By setting up a check valve, the guide wheel and multiple inclined baffles are engaged in a one-way locking mechanism. During normal lifting of goods, the inclined baffles moving with the timing belt will not be obstructed by the mounting frame. However, when the weight of the goods causes the timing belt to slip and move in the opposite direction, the guide wheel can immediately block the corresponding inclined baffle, effectively preventing the timing belt from moving in the opposite direction, preventing the overhead crane belt from reversing, ensuring the safety and stability of the overhead crane operation, and avoiding accidents such as goods falling and equipment damage that may be caused by reversal. 2. A pressure sensor is installed inside the guide wheel. When the inclined baffle moves in the opposite direction due to the slippage of the timing belt and applies pressure to the guide wheel, the pressure sensor can quickly detect the pressure change and immediately activate the external buzzer through the controller. This design allows the staff to know about the abnormal situation of the crane belt slipping and reversing at the first time, and take timely maintenance measures to prevent the problem from deteriorating further and reduce downtime and maintenance costs.

[0014] This invention can prevent the overhead crane belt from reversing, thus avoiding cargo falling and safety accidents; it reacts quickly, triggering a buzzer alarm in the early stages of reversal; the position of the stop wheel can be flexibly controlled by an electric push rod, without affecting normal winding and unwinding; the movable box can slide flexibly to adapt to different operational needs, effectively solving the braking and alarm defects of existing technologies. Attached Figure Description

[0015] Figure 1 This is a first-view three-dimensional structural diagram of an anti-reverse alarm device for overhead crane belts proposed in this utility model. Figure 2 This is a two-dimensional schematic diagram of the structure of an anti-reverse alarm device for overhead crane belts proposed in this utility model. Figure 3 This is a three-dimensional schematic diagram of the internal structure of a mobile box for an anti-reverse alarm device for overhead crane belts, as proposed in this utility model. Figure 4 This is a three-dimensional schematic diagram of the connection structure of the winch motor, synchronous belt and shaft for an anti-reverse alarm device for overhead crane belts proposed in this utility model; Figure 5 This is a three-dimensional schematic diagram of the internal structure of a protective cover for an anti-reverse alarm device for overhead crane belts, as proposed in this utility model. Figure 6 This utility model presents a three-dimensional schematic diagram of an electric push rod, support plate, mounting bracket, guide wheel, and multiple inclined baffle transmission and cooperation structure for an anti-reverse alarm device for overhead crane belts.

[0016] In the diagram: 1. Support rail; 2. Moving box; 3. Servo motor; 4. Drive gear; 5. Rack; 6. Hoist motor; 7. First synchronous pulley; 8. Shaft; 9. Reel; 10. Wire rope; 11. Second synchronous pulley; 12. Synchronous belt; 13. Inclined baffle; 14. Protective cover; 15. Electric push rod; 16. Support plate; 17. Support rod; 18. Mounting bracket; 19. Thrust wheel; 20. Compression spring; 21. Support bracket. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] In one embodiment: Refer to Figure 1-6 An alarm device includes a support rail 1 and a movable box 2. The support rail 1 is fixedly installed at a predetermined position on a crane frame as the main load-bearing structure. The movable box 2 is slidably connected to the support rail 1 through internal pulleys or slider assemblies, allowing it to move horizontally along the length of the support rail. An opening is provided at the bottom of the movable box 2 for a steel wire rope 10 to pass through. A servo motor 3 is fixedly installed on each side of the movable box 2. The output axis of the servo motor 3 extends into the interior of the movable box 2, and a drive gear 4 is fixedly installed at its end. Two racks 5 are symmetrically fixedly installed on the support rail 1, with their tooth surfaces facing each other. The drive gears 4 on both sides precisely mesh with the racks 5 on the same side. When the movable box 2 needs to move along the support rail 1, both servo motors 3 are simultaneously activated. The servo motors 3 drive the drive gears 4 to rotate, and through meshing with the fixed racks 5, the entire movable box 2 can be moved smoothly.

[0019] like Figure 3-6 As shown, a winding component is installed inside the support rail 1, on which a steel wire rope 10 for lifting goods is wound. The bottom end of the steel wire rope 10 passes through an opening at the bottom of the movable box 2, extends to the bottom of the movable box 2, and is connected to a hook or loading platform. A protective cover 14 is fixedly installed on one side of the movable box 2, and a portion of the winding component extends into the interior of this protective cover 14. Multiple inclined baffles 13 are connected at equal intervals on the winding component, and these inclined baffles 13 are all located inside the interior space of the protective cover 14. The device also includes a check valve component installed on one side of the protective cover 14, one side of which also extends into the protective cover 14. Its working end can engage with the multiple inclined baffles 13 to achieve anti-reverse rotation and alarm functions.

[0020] like Figure 3-6As shown, the specific structure of the winding component is as follows. Inside the movable box 2, a rotating shaft 8 is rotatably connected. A reel 9 is fixedly sleeved on the rotating shaft 8, and one end of the wire rope 10 is fixed and regularly wound around this reel 9. One end of the rotating shaft 8 passes through the side wall of the movable box 2 and extends into the interior of the protective cover 14. A winch motor 6 is fixedly installed on the inner wall of the movable box 2 facing the protective cover 14. The output shaft of the winch motor 6 also extends into the protective cover 14. Inside the protective cover 14, the output shaft of the winch motor 6 is connected to the extended end of the rotating shaft 8 through a transmission assembly. Multiple inclined baffles 13 are installed at equal intervals on this transmission assembly. When the winch motor 6 is started, the winch motor 6 drives the transmission assembly to move, and the transmission assembly in turn drives the rotating shaft 8 to rotate. When the rotating shaft 8 rotates, it drives the reel 9 to rotate synchronously, thereby realizing the winding or unwinding operation of the wire rope 10 to lift or lower the goods.

[0021] like Figure 3-6 As shown, the specific structure of the transmission assembly is as follows: a first synchronous pulley 7 is fixedly installed on the output shaft of the winch motor 6, and a second synchronous pulley 11 is fixedly installed on the extension end of the rotating shaft 8. The first synchronous pulley 7 and the second synchronous pulley 11 are connected by the same synchronous belt 12. Multiple inclined baffles 13 are fixedly installed on the outer surface of this synchronous belt 12 at equal intervals and at a certain angle. When the winch motor 6 starts and drives the first synchronous pulley 7 to rotate, the second synchronous pulley 11 will rotate accordingly through the transmission of the synchronous belt 12, thereby driving the rotating shaft 8 and the winding shaft 9 to rotate. In this way, the forward and reverse rotation of the winch motor 6 controls the winding and unwinding of the wire rope 10. During the transmission process, the movement of the synchronous belt 12 will drive the inclined baffles 13 on it to move together.

[0022] This application can be used in the field of lifting equipment technology, or in other fields applicable to this application.

[0023] In another embodiment: Reference Figure 4-6Based on the above embodiments, an improvement is made to the following: an anti-reverse alarm device for overhead crane belts, applied in the field of lifting equipment technology. The structure of this embodiment is basically the same as the aforementioned embodiments, except that the specific structure of the anti-reverse component is as follows. An electric push rod 15 is fixedly installed on one side of the outer wall of the protective cover 14. The output shaft of the electric push rod 15 extends horizontally into the interior of the protective cover 14, and a support plate 16 is fixedly installed at its end. A set of support components is connected to the support plate 16, and a mounting bracket 18 is installed at the end of the support components. A stop wheel 19 is rotatably connected to the inside of the mounting bracket 18 through a bearing. A pressure sensor is embedded inside the stop wheel 19, which is electrically connected to a controller through a wire, and the controller is then connected to an external buzzer. One side of the stop wheel 19 extends out of the mounting bracket 18, and its circumferential surface is configured to engage with the moving inclined baffle 13 in a one-way manner, that is, only allowing the inclined baffle 13 to pass smoothly in one direction, while blocking its reverse movement. When the anti-reverse function needs to be activated, the electric push rod 15 is activated. The output shaft of the electric push rod 15 extends and pushes the mounting bracket 18 and the guide wheel 19 towards the synchronous belt 12 through the support assembly until the wheel surface of the guide wheel 19 moves to a position where it can just contact the inclined baffle 13 that it is passing. During normal lifting of goods, the winch motor 6 drives the synchronous belt 12 to move in a specific direction, and the inclined baffle 13 moves accordingly. When the inclined baffle 13 contacts the guide wheel 19, its inclined surface will squeeze the guide wheel 19, causing it to swing slightly or give way, allowing the inclined baffle 13 to slide smoothly without obstructing the normal lifting process. However, if the reel 9 has a momentary or continuous reverse tendency due to excessive weight of goods, insufficient motor power, or transmission system failure, the synchronous belt 12 will drive the inclined baffle 13 to move in the opposite direction. At this time, the back of the inclined baffle 13 will directly abut against the guide wheel 19, and the guide wheel 19 will immediately stop its continued movement, thereby locking the reverse movement of the synchronous belt 12 and preventing the goods from falling uncontrollably due to gravity. Meanwhile, the blocking pressure exerted by the inclined baffle 13 on the retaining wheel 19 is detected by the pressure sensor inside the retaining wheel 19. The pressure sensor transmits the signal to the controller, which then triggers an external buzzer to sound an alarm, alerting on-site personnel that the equipment has slipped or reversed and requires maintenance.

[0024] like Figure 6As shown, the specific structure of the support assembly is used to ensure the stability and cushioning of the contact between the retaining wheel 19 and the inclined baffle 13. It includes two support rods 17. These two support rods 17 pass parallel through the support plate 16 and form a sliding connection with the through holes on the support plate 16. The ends of the two support rods 17 near the timing belt 12 are fixedly connected to the back of the mounting bracket 18. Each support rod 17 is fitted with a compression spring 20, which is located between the mounting bracket 18 and the support plate 16. The two ends of the compression spring 20 are fixedly connected to the back of the mounting bracket 18 and the front of the support plate 16 respectively through hooks at their ends. When the electric push rod 15 pushes the support plate 16 closer to the inclined baffle 13, the support rods 17 and the mounting bracket 18 move accordingly, positioning the retaining wheel 19 in the working position. During normal lifting, the inclined surface of each ramp baffle 13 presses against the retaining roller 19, causing the retaining roller 19 and mounting bracket 18 to slightly retract along the axis of the support rod 17 towards the support plate 16. This process compresses the compression spring 20. Once the ramp baffle 13 has passed, the compressed spring 20 releases its elasticity, pushing the mounting bracket 18 and retaining roller 19 back to their original positions, ready to contact the next ramp baffle 13. This design makes the contact between the retaining roller 19 and the moving ramp baffle 13 flexible and cushioned, reducing impact and wear. More importantly, when the timing belt 12 attempts to reverse, the back of the ramp baffle 13 is a vertical surface, which will firmly lock onto the retaining roller 19. The compression spring 20 provides a reverse support force at this time, helping the retaining roller 19 to more effectively block the ramp baffle 13 and prevent it from slipping off.

[0025] like Figure 6 As shown, to further enhance the stability of the support plate 16 during movement, a sliding connection structure is provided at the bottom of the support plate 16. Specifically, a groove or slider is provided on the bottom surface of the support plate 16 to cooperate with a support bracket 21 fixedly installed on the inner wall of the protective cover 14. The upper surface of the support bracket 21 is provided with a guide rail or slide that matches the bottom of the support plate 16, allowing the support plate 16 to slide horizontally along the support bracket 21. This support bracket 21 provides additional bottom support for the support plate 16, ensuring the smooth horizontal movement and operation of the entire anti-return component consisting of the support plate 16, support rod 17, mounting bracket 18, and retaining wheel 19, and avoiding vibration or jamming problems that may occur due to excessive cantilever length.

[0026] However, as is well known to those skilled in the art, the working principles and wiring methods of the servo motor 3, the winch motor 6 and the electric push rod 15 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reverse rotation alarm device for overhead crane belts, characterized in that, include: Support rail (1); The movable box (2) is slidably connected to the support rail (1); The winding component is located inside the movable box (2). The winding component includes a rotating shaft (8), a reel (9) fixedly sleeved on the rotating shaft (8), and a wire rope (10) wound around the reel (9). A transmission assembly is connected to the winding component. The transmission assembly includes a timing belt (12) and multiple inclined baffles (13) that are equally spaced and inclinedly fixed to the timing belt (12). A protective cover (14) is fixedly installed on one side of the mobile box (2), and the transmission component is located inside the protective cover (14); A check valve component is installed on one side of the protective cover (14). The check valve component includes an electric push rod (15), a support plate (16) driven by the electric push rod (15) and located inside the protective cover (14), a mounting bracket (18) installed on the support plate (16), and a stop wheel (19) rotatably connected to the mounting bracket (18). A pressure sensor is provided inside the stop wheel (19). The wheel surface of the guide wheel (19) slides in cooperation with the inclined surface of the inclined baffle (13). When the wire rope (10) is wound up, the inclined baffle (13) moves with the synchronous belt (12) and pushes the guide wheel (19) to make way. When the wire rope (10) shows a reversal trend, the back of the inclined baffle (13) abuts against the guide wheel (19) to stop its movement and triggers an alarm of the pressure sensor.

2. The anti-reverse rotation alarm device for overhead crane belts according to claim 1, characterized in that, Servo motors (3) are fixedly installed on both sides of the mobile box (2). The output shaft of the servo motor (3) extends into the mobile box (2) and is fixedly installed with a drive gear (4). Two racks (5) that mesh with the drive gear (4) are symmetrically fixedly installed on the support rail (1).

3. The anti-reverse rotation alarm device for overhead crane belts according to claim 1, characterized in that, The device also includes a winch motor (6) fixedly installed in the mobile box (2), and the transmission assembly is connected between the output shaft of the winch motor (6) and the rotating shaft (8).

4. The anti-reverse rotation alarm device for overhead crane belts according to claim 3, characterized in that, The transmission assembly also includes a first synchronous pulley (7) fixedly installed on the output shaft of the hoist motor (6) and a second synchronous pulley (11) fixedly installed on one end of the rotating shaft (8), and the synchronous belt (12) is sleeved on the first synchronous pulley (7) and the second synchronous pulley (11).

5. The anti-reverse rotation alarm device for overhead crane belts according to claim 1, characterized in that, The check valve also includes a support assembly, which includes two parallel support rods (17). The support rods (17) pass through the support plate (16) and are slidably connected to the support plate (16). One end of the support rod (17) is fixedly connected to the mounting bracket (18). A compression spring (20) is sleeved on the support rod (17) between the mounting bracket (18) and the support plate (16).

6. The anti-reverse rotation alarm device for overhead crane belts according to claim 5, characterized in that, The bottom of the support plate (16) is slidably connected to a support bracket (21), which is fixed to the inner wall of the protective cover (14).

7. The anti-reverse rotation alarm device for overhead crane belts according to claim 1, characterized in that, The pressure sensor is electrically connected to the buzzer via the controller. When the back of the inclined baffle (13) abuts against the stop wheel (19), the signal generated by the pressure sensor triggers the buzzer to sound an alarm via the controller.

8. The anti-reverse rotation alarm device for overhead crane belts according to any one of claims 1 to 7, characterized in that, The bottom of the mobile box (2) has an opening for the steel wire rope (10) to pass through.

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