Bridge crane limiting device

Abstract

The utility model discloses a bridge crane limiting device which comprises a sliding rail, two pulleys are connected to the bottoms of the front end and the rear end of the sliding rail in a sliding mode, the front pulley and the rear pulley are connected with a sliding frame in a rotating mode through rotating shafts, a lifting hook is installed at the lower end of the sliding frame, and the bridge crane limiting device further comprises a limiting mechanism. The limiting mechanism comprises first dovetail grooves, convex tooth clamping strips, a rack plate and a driving assembly, the first dovetail grooves are symmetrically formed in the front side and the rear side of the sliding frame in the left-right direction correspondingly, and the convex tooth clamping strips are slidably connected between the two first dovetail grooves in the front side and between the two first dovetail grooves in the rear side correspondingly. Through mutual cooperation of all the elements, accurate stopping and limiting operation can be conducted on movement of the bridge crane, the situation that the bridge crane continues to slide along the corresponding sliding rails due to self or external reasons after overall stopping is avoided, and stopping and limiting of overall movement of the bridge crane are accurate.

Description

Technical Field

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

[0002] Bridge cranes are lifting equipment that spans across workshops, warehouses, and material yards for material handling. During the use of bridge cranes, a limiting device is used to limit the movement of the bridge crane along the slide rail to prevent it from continuing to slide along the slide rail after stopping due to inertia and failing to stop quickly. In the prior art, patent CN 214828381 U discloses a limiting buffer device for a bridge crane, which consists of an electric hoist, pulleys, connecting frames, slide rails, a turntable, hooks, and compression rods. The surface of the electric hoist is provided with two connecting frames, and the surface of the connecting frames is rotatably connected to two pulleys. The surface of the pulleys is provided with slide rails. The surface of the electric hoist is provided with a turntable, and the surface of the turntable is fixedly equipped with hooks. Two positioning rods are inserted inside the connecting frames. This invention addresses the issue that when an electric hoist slides, it drives the wheel to rotate. When the electric hoist stops sliding, the wheel is subjected to the elastic force of spring A. After the wheel is subjected to the elastic force, the friction between the wheel and the slide rail increases, slowing down the sliding speed of the electric hoist. This solves the problem that electric hoists on bridge cranes cannot stop quickly due to inertia. However, while this device solves the problem of electric hoists on bridge cranes not stopping quickly due to inertia by frictional deceleration, this frictional inertia requires a certain distance to achieve. As a result, the bridge crane still needs to slide a certain distance after it stops moving to achieve a complete stop. Therefore, we propose a limiting device for bridge cranes. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a bridge crane limiting device. This device, through the cooperation of various components, can accurately stop and limit the movement of the bridge crane, preventing the bridge crane from continuing to slide along the corresponding sliding track after the entire bridge crane has stopped due to its own or external reasons. This makes the overall movement of the bridge crane more accurately stopped and limited, and can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a bridge crane limiting device, including a slide rail, with two pulleys slidably connected to the bottom of both the front and rear ends of the slide rail, and a sliding frame rotatably connected to both the front and rear pulleys via a rotating shaft, with a hook installed at the lower end of the sliding frame, and also including a limiting mechanism;

[0005] Limiting mechanism: It includes a dovetail groove, a toothed clip, a rack plate, and a drive assembly. The dovetail grooves are symmetrically opened on the front and rear sides of the sliding frame. A toothed clip is slidably connected between the two dovetail grooves on the front side and between the two dovetail grooves on the rear side. The top walls of the front and rear ends of the slide rail are provided with rack plates, which are installed in conjunction with the vertically adjacent toothed clips. A drive assembly is provided between the toothed clips and the slide rail. Through the cooperation of various components, this device can accurately stop and limit the movement of the bridge crane, preventing the bridge crane from continuing to slide along the corresponding sliding track after the whole bridge crane has stopped due to its own or external reasons, so that the overall movement of the bridge crane is stopped and limited more accurately.

[0006] Furthermore, it also includes a microcontroller, which is located outside the slide rail. The input terminal of the microcontroller is electrically connected to an external power supply, making it convenient to control electrical components.

[0007] Furthermore, it also includes a connecting frame, on the upper side of which is provided a dovetail groove II. The interior of the dovetail groove II is slidably connected to the lower end of the sliding frame. An electric hoist is provided on the lower side of the connecting frame. The input end of the electric hoist is electrically connected to the output end of the microcontroller. The load of the electric hoist is fixedly connected to the upper end of the hook through a movable pulley, thereby realizing the lifting and lowering of goods by the bridge crane.

[0008] Furthermore, the drive assembly includes a second rotating shaft, a first rotating rod, a third rotating shaft, a second rotating rod, a fourth rotating shaft, a circular ring, and an electro-hydraulic actuator. The first rotating rod is rotatably connected to the left and right ends of the front and rear sides of the sliding frame via the second rotating shaft. The upper end of the first rotating rod is rotatably connected to the second rotating rod via the third rotating shaft. The upper end of the second rotating rod is rotatably connected to the vertically adjacent toothed clip via the fourth rotating shaft. The outer side of the third rotating shaft is rotatably connected to the circular ring via a bearing. An electro-hydraulic actuator is provided between two horizontally adjacent circular rings. The input end of the electro-hydraulic actuator is electrically connected to the output end of the microcontroller to provide stable power output for the track free-slip limit after the bridge crane stops.

[0009] Furthermore, the limiting mechanism also includes an anti-sway component, which includes an electro-hydraulic actuator and a compression seat. The electro-hydraulic actuator is respectively disposed on the left and right sides of the connecting frame. The input end of the electro-hydraulic actuator is electrically connected to the output end of the microcontroller. The telescopic end of the electro-hydraulic actuator is provided with a compression seat. The side of the compression seat near the transverse center of the sliding frame is in contact with the adjacent sliding frame, so as to provide elastic damping buffer for the movement inertia between the electric hoist and the components below it after the bridge crane stops.

[0010] Furthermore, the limiting mechanism also includes a buffer assembly, which includes a damper and a spring. Two dampers and two springs are arranged as a group. A group of dampers and springs are provided between the left and right sides of the sliding frame and the adjacent dovetail groove. The springs are movably connected to the outer ends of the adjacent dampers to ensure that after the anti-sway component in the bridge crane limiting device is used, the lower end of the sliding frame can automatically return to the middle of the connecting frame.

[0011] Furthermore, a motor is provided at the front left end of the sliding frame. The input end of the motor is electrically connected to the output end of the microcontroller, and the output shaft of the motor is fixedly connected to the front end of the left front rotating shaft to provide power for the bridge crane to move along the track.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This bridge crane limiting device has the following advantages:

[0013] When using the limit device for a bridge crane, the dovetail groove, toothed rack, rack plate, and drive assembly work together to accurately stop and limit the movement of the bridge crane. The buffer assembly provides elastic damping to buffer the inertia of the electric hoist and the components below it, preventing the bridge crane from continuing to slide along the corresponding sliding track after it has stopped due to its own or external reasons. This makes the overall movement and stopping of the bridge crane more precise. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an enlarged structural diagram of point A in this utility model;

[0016] Figure 3 This is an enlarged structural diagram of section B of the present invention;

[0017] Figure 4 This is a schematic diagram of the sliding frame and connecting frame structure of this utility model.

[0018] In the diagram: 1. Slide rail, 2. Microcontroller, 3. Pulley, 4. Rotary shaft 1, 5. Sliding frame, 6. Connecting frame, 7. Limiting mechanism, 71. Dovetail groove 1, 72. Toothed clip, 73. Rack plate, 74. Drive assembly, 741. Rotary shaft 2, 742. Rotary rod 1, 743. Rotary shaft 3, 744. Rotary rod 2, 745. Rotary shaft 4, 746. Ring, 747. Electro-hydraulic actuator 1, 75. Anti-sway assembly, 751. Electro-hydraulic actuator 2, 752. Pressing seat, 76. Buffer assembly, 761. Damper, 762. Spring, 8. Electric hoist, 9. Moving pulley, 10. Hook, 11. Motor. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-4 This embodiment provides a technical solution: a bridge crane limiting device, including a slide rail 1, with two pulleys 3 slidably connected to the bottom of both the front and rear ends of the slide rail 1. Each of the two pulleys 3 is rotatably connected to a sliding frame 5 via a rotating shaft 4. The sliding method between the pulleys 3 and the slide rail 1 is the existing track sliding technology of bridge cranes. A hook 10 is installed at the lower end of the sliding frame 5. The device also includes a microcontroller 2, located outside the slide rail 1, with its input terminal electrically connected to an external power source. A connecting frame 6 is also included, with a dovetail groove 2 on its upper side. The interior of the dovetail groove 2 is slidably connected to the lower end of the sliding frame 5. An electric hoist 8 is installed on the lower side of the connecting frame 6, with its input terminal electrically connected to the output terminal of the microcontroller 2. The load of the electric hoist 8 is connected via a... The upper end of the pulley 9 is fixedly connected to the hook 10. The front left end of the sliding frame 5 is equipped with a motor 11. The input end of the motor 11 is electrically connected to the output end of the microcontroller 2. The output shaft of the motor 11 is fixedly connected to the front end of the left front rotating shaft 4. When using the bridge crane, the microcontroller 2 starts the electric hoist 8. The electric hoist 8 uses the motor to drive the hoist winch to rotate, and lifts or lowers the load through the winch. The load drives the pulley 9 and hook 10 to lift or lower synchronously, thereby realizing the lifting operation of the bridge crane on the items. Then the microcontroller 2 starts the motor 11 so that its output shaft drives the corresponding pulley 3 to rotate through the rotating shaft 4. Through the contact friction between the pulley 3 and the slide rail 1, the bridge crane moves along the slide rail 1 to the lifting position. It also includes a limit mechanism 7.

[0021] Limiting mechanism 7 includes a dovetail groove 71, a toothed retaining strip 72, a rack plate 73, and a drive assembly 74. The dovetail grooves 71 are symmetrically arranged on the front and rear sides of the sliding frame 5. A toothed retaining strip 72 is slidably connected between the two dovetail grooves 71 on the front side and between the two dovetail grooves 71 on the rear side. A rack plate 73 is provided on the top wall of both the front and rear ends of the slide rail 1. The rack plate 73 is installed in conjunction with the vertically adjacent toothed retaining strip 72. A drive assembly 74 is provided between the toothed retaining strip 72 and the slide rail 1. The drive assembly 74 includes a rotating shaft 741, a rotating rod 742, a rotating shaft 743, a rotating rod 744, a rotating shaft 745, a ring 746, and an electro-hydraulic actuator 747. The rotating rod 742 is rotatably connected to the sliding frame 1 through the rotating shaft 741. At the left and right ends of the front and rear sides of the frame 5, the upper ends of rotating rod 1 742 are rotatably connected to rotating rod 2 744 via rotating shaft 3 743. The upper ends of rotating rod 2 744 are rotatably connected to the vertically adjacent toothed clip 72 via rotating shaft 4 745. The outer side of rotating shaft 3 743 is rotatably connected to a ring 746 via a bearing. Between two horizontally adjacent rings 746, there is an electro-hydraulic actuator 1 747. The input end of electro-hydraulic actuator 1 747 is electrically connected to the output end of microcontroller 2. The limiting mechanism 7 also includes an anti-sway component 75, which includes electro-hydraulic actuator 2 751 and a pressing seat 752. Electro-hydraulic actuator 2 751 is respectively set on the left and right sides of the connecting frame 6. The input end of electro-hydraulic actuator 2 751 is electrically connected to the output end of microcontroller 2. Each telescopic end of the second sliding frame 751 is equipped with a pressing seat 752. The side of the pressing seat 752 closest to the transverse center of the sliding frame 5 is in contact with the adjacent sliding frame 5. The limiting mechanism 7 also includes a buffer assembly 76, which includes a damper 761 and a spring 762. Two dampers 761 and two springs 762 are arranged as a group. A set of dampers 761 and springs 762 is provided between the left and right sides of the sliding frame 5 and the adjacent dovetail groove 2. The springs 762 are movably sleeved with the outer end of the adjacent damper 761. When the bridge crane moves to a certain position along the slide rail 1 according to the working requirements, the microcontroller 2 activates the electro-hydraulic push rod 751 so that its telescopic end drives the corresponding pressing seat 752 away from the lower end of the sliding frame 5, thereby releasing the sliding frame 5 from moving along the dovetail groove 2 in the connecting frame 6. The sliding limit is then activated by the microcontroller 2, which simultaneously retracts the telescopic ends of the electro-hydraulic actuator 747. The retraction of the telescopic ends of the electro-hydraulic actuator 747 causes the two laterally adjacent rings 746 to move closer together. The rings 746, the upper ends of the first rotating rod 742, and the lower ends of the second rotating rod 744 all adaptively rotate along the corresponding rotating shaft 743. The lower ends of the first rotating rod 742 adaptively rotate along the adjacent rotating shaft 741, and the upper ends of the second rotating rod 744 adaptively rotate along the adjacent rotating shaft 745. Through the scissor brace structure formed by the drive assembly 74, the toothed locking strip 72 slides stably vertically upwards along the corresponding dovetail groove 71 and engages with the teeth of the adjacent rack plate 73, thus timely limiting the movement of the bridge crane along the slide rail 1.Simultaneously, the inertia of the bridge crane itself acts on the upper end of the connecting frame 6, causing the bottom center protrusion of the sliding frame 5 to slide adaptively along the dovetail groove of the connecting frame 6. Through the elastic contraction of the spring 762 and the friction or hydraulic resistance of the elastic and bearing elements inside the damper 761, this inertial force is converted into heat energy and released. By reducing the inertial force on the connecting frame 6 and the parts below the connecting frame 6 at the limiting part, the service life of the limiting part is indirectly improved. After the connecting frame 6 and the sliding frame 5 stop sliding, the microcontroller 2 activates the two electro-hydraulic push rods 751, causing their extension ends to drive the compression seats 752 to extend to their initial positions simultaneously. Through the mutual compression of the two compression seats 752, the bottom protrusion of the sliding frame 5 is fixed to the middle of the connecting frame 6 again, so that the sliding frame 5 and the connecting frame 6 are fixed together again. This device, through the cooperation of various components, can accurately stop and limit the movement of the bridge crane, preventing the bridge crane from continuing to slide along the corresponding sliding track after the whole bridge crane has stopped due to its own or external reasons, making the overall movement stopping and limiting of the bridge crane more accurate.

[0022] The working principle of the bridge crane limit device provided by this utility model is as follows: When using the bridge crane, the microcontroller 2 starts the electric hoist 8. The electric hoist 8 uses a motor to drive the hoist winch to rotate, lifting or lowering the load through the winch. The load drives the movable pulley 9 and the hook 10 to lift or lower synchronously, thereby realizing the lifting operation of the bridge crane on the goods. Then, the microcontroller 2 starts the motor 11, causing its output shaft to drive the corresponding pulley 3 to rotate through the rotating shaft 4. Through the contact friction between the pulley 3 and the slide rail 1, the bridge crane moves along the slide rail 1 to the lifting position. When the slide rail 1 moves to a certain position according to the work requirements, the microcontroller 2 activates the electro-hydraulic actuator 751, causing its telescopic end to drive the corresponding compression seat 752 away from the lower end of the sliding frame 5, thereby releasing the sliding lock relationship between the sliding frame 5 and the dovetail groove 2 in the connecting frame 6. Subsequently, the microcontroller 2 activates the electro-hydraulic actuator 747, causing its telescopic end to retract simultaneously. The retraction of the telescopic end of the electro-hydraulic actuator 747 causes the two laterally adjacent rings 746 to move closer to each other. The rings 746, the upper end of the rotating rod 742, and the lower end of the rotating rod 744 all rotate adaptively along the corresponding rotating shaft 743. The lower end of the rotating rod 742... All rotating rods 744 and 745 rotate adaptively along adjacent pivot 741. The upper ends of pivot 744 and 745 rotate adaptively along adjacent pivot 745. The scissor brace structure formed by the drive assembly 74 allows the toothed clip 72 to slide stably vertically upward along the corresponding dovetail groove 71 and engage with the toothed clip of the adjacent rack plate 73. This provides timely limit to the movement of the bridge crane along the slide rail 1. At the same time, the inertia of the bridge crane acts on the upper end of the connecting frame 6, causing the protrusion at the bottom center of the sliding frame 5 to slide adaptively along the dovetail groove 745 of the connecting frame 6. This is achieved through the elastic contraction of the spring 762 and the damping. The elastic and load-bearing elements inside the device 761 convert the inertial force of motion into heat energy through friction or hydraulic resistance. By reducing the inertial force of motion on the connecting frame 6 and the parts below the connecting frame 6, the service life of the limiting part is indirectly improved. After the connecting frame 6 and the sliding frame 5 stop sliding, the microcontroller 2 activates the two electro-hydraulic push rods 751 so that their extension ends drive the extrusion seats 752 to extend to the initial position at the same time. Through the mutual extrusion of the two extrusion seats 752, the bottom protrusion of the sliding frame 5 is fixed to the middle of the connecting frame 6 again, so that the sliding frame 5 and the connecting frame 6 are fixed together again.

[0023] It is worth noting that the microcontroller 2 disclosed in the above embodiments can be a COP8CBE9, the electro-hydraulic actuator 747 and the electro-hydraulic actuator 751 can both be DYZW integral straight micro electro-hydraulic actuators, the electric hoist 8 can be an MD type electric hoist, and the motor 11 can be a DT-D02. The microcontroller 2 controls the operation of the electro-hydraulic actuator 747, the electro-hydraulic actuator 751, the electric hoist 8, and the motor 11 using methods commonly used in the prior art.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A bridge crane limiting device, comprising a sliding rail (1), the bottom of the front and rear ends of the sliding rail (1) is slidingly connected with two pulleys (3), the front and rear pulleys (3) are both rotatably connected with a sliding frame (5) through a rotating shaft (4), and the lower end of the sliding frame (5) is provided with a lifting hook (10), characterized in that: It also includes a limiting mechanism (7); The limiting mechanism (7) comprises dovetail groove one (71), toothed strip (72), rack plate (73) and drive assembly (74), the dovetail groove one (71) is respectively left-right symmetrical and opened in the front and back of the sliding frame (5), the front two dovetail groove one (71) and the back two dovetail groove one (71) are both slidably connected with a toothed strip (72), the top wall of the front and back of the slide rail (1) is provided with a rack plate (73), the rack plate (73) is installed with the vertically adjacent toothed strip (72), and the toothed strip (72) is provided with a drive assembly (74) between the slide rail (1).

2. A bridge crane position limiting device according to claim 1, characterized in that: It also includes a single-chip microcomputer (2), the single-chip microcomputer (2) is located outside the slide rail (1), and the input end of the single-chip microcomputer (2) is electrically connected with the external power supply.

3. A bridge crane position limiting device according to claim 2, characterised in that: It also includes a connecting frame (6), the upper side of the connecting frame (6) is provided with a dovetail groove two, the inside of the dovetail groove two is slidably connected with the lower end of the sliding frame (5), the lower side of the connecting frame (6) is provided with an electric hoist (8), the input end of the electric hoist (8) is electrically connected with the output end of the single-chip microcomputer (2), and the load of the electric hoist (8) is fixedly connected with the upper end of the hook (10) through the movable pulley (9).

4. A bridge crane position limiting device as claimed in claim 2, characterized in that: The drive assembly (74) comprises shaft two (741), rotating rod one (742), shaft three (743), rotating rod two (744), shaft four (745), circular ring (746) and electro-hydraulic push rod one (747), the rotating rod one (742) is rotatably connected to the left and right ends of the front and back of the sliding frame (5) through the shaft two (741), the upper end of the rotating rod one (742) is rotatably connected with the rotating rod two (744) through the shaft three (743), the upper end of the rotating rod two (744) is rotatably connected with the vertically adjacent toothed strip (72) through the shaft four (745), the outer side of the shaft three (743) is rotatably connected with the circular ring (746), one electro-hydraulic push rod one (747) is arranged between the two circular rings (746) which are transversely adjacent, and the input end of the electro-hydraulic push rod one (747) is electrically connected with the output end of the single-chip microcomputer (2).

5. A bridge crane position limiting device as claimed in claim 3, characterized in that: The limiting mechanism (7) further comprises an anti-shaking assembly (75), and the anti-shaking assembly (75) comprises an electro-hydraulic push rod two (751) and an extrusion seat (752).

6. A bridge crane position limiting device as claimed in claim 3, characterized in that: The limiting mechanism (7) further comprises a buffer assembly (76), and the buffer assembly (76) comprises a damper (761) and a spring (762). The limiting mechanism (7) further comprises a buffer assembly (76), and the buffer assembly (76) comprises a damper (761) and a spring (762).

7. A bridge crane position limiting device as claimed in claim 2, characterized in that: The front left end of the sliding frame (5) is provided with a motor (11), the input end of the motor (11) is electrically connected with the output end of the single-chip microcomputer (2), and the output shaft of the motor (11) is fixedly connected with the front end of the left front rotating shaft (4).

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