Device for preventing crane beam from jacking cab during lifting

Abstract

The utility model discloses a device for preventing a crane beam from colliding with a cab during lifting, relates to the field of crane lifting control, and solves the technical problem that a winch beam is easy to collide with the cab in the existing manual crane operation mode. The device comprises a first limit switch and a second limit switch, the first limit switch is installed on a main beam in front of a cab through a buffer structure, and the second limit switch is installed on a main beam on the other side through a buffer structure. The vertical distance between the cab and the first limiting switch is larger than the vertical distance between the cab and the second limiting switch, and limiting safety rulers are installed at the two ends of the trolley platform respectively. The hoisting beam can be prevented from colliding with a cab to the greatest extent, and the safety of equipment and personnel is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of crane hoisting control, and more specifically, it relates to a device for preventing the crane crossbeam from hitting the cab during hoisting. Background Technique

[0002] The traditional hoisting of the crane winch crossbeam mainly consists of a drum screw type limit travel switch system. The crane includes two main beams, and trolley tracks are installed on both main beams, and a trolley platform is installed on the trolley tracks. The drum screw type limit travel switch system includes a winch main limit switch and a trolley limit switch connected to the internal control circuit. The winch main limit switch is installed at one end of the trolley platform. When the drum rotates a certain number of turns, the crane wire rope drum will trigger the winch main limit switch through a cross coupling. The main limit switch changes from a normally closed contact to an open contact, the winch control circuit in the internal control circuit is disconnected, the winch motor stops outputting upward, the drum stops moving and reaches the upper limit position.

[0003] Single-hook and double-hook cranes can still meet the control requirements. However, for magnetic disk cranes with crossbeams and slewing mechanisms, relying solely on the screw type limit travel switch system often cannot meet the requirements. When the trolley travels to the cab side and the winch crossbeam rises at the same time, if the operating driver is not concentrated or reacts not quickly enough during operation, the winch crossbeam is likely to hit the cab, ultimately resulting in safety accidents. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a device for preventing the crane crossbeam from hitting the cab during hoisting in view of the deficiencies of the prior art, and solve the technical problem that the existing manual operation mode of the crane easily causes the winch crossbeam to hit the cab.

[0005] A device for preventing the crane crossbeam from hitting the cab during hoisting according to the utility model includes a first limit switch and a second limit switch. The first limit switch is installed on the main beam in front of the cab through a buffer structure, and the second limit switch is installed on the other main beam through a buffer structure. And the vertical distance between the cab and the first limit switch is greater than the vertical distance between the cab and the second limit switch. Limit safety rulers are installed at both ends of the trolley platform.

[0006] As a further improvement, the power input end of the trolley platform is electrically connected to the power supply through a series connection of the main limit switch, the first limit switch and the second limit switch.

[0007] Furthermore, the main limit switch, the first limit switch and the second limit switch are all normally closed type limit switches.

[0008] Further, a manual switch is electrically connected between the main limit switch and the power supply.

[0009] Further, the buffer structure includes a mounting base, a shock absorber, a connecting block and a slider. A fixing block integrally formed therewith is fixedly installed above the mounting base. One end of the shock absorber is fixedly installed on one side of the fixing block, and the other end of the shock absorber is fixedly connected to the first limit switch. The first limit switch is slidably installed on the mounting base through the slider. Connecting blocks are fixedly installed at both ends of the bottom of the mounting base, and the connecting blocks are fixedly installed on the main beam.

[0010] Further, the shock absorber is a spring.

[0011] Beneficial effects

[0012] The advantages of the present utility model are as follows:

[0013] By installing the first limit switch and the second limit switch on the main beam of the present utility model, and triggering the first limit switch and the second limit switch through the limit safety ruler installed on the trolley platform, the trolley platform is stopped before reaching the cab, which maximally prevents the hoisting cross beam from hitting the cab, is beneficial to ensuring the safety of equipment and personnel, and the first limit switch and the second limit switch are installed on the main beam through the buffer structure, and the buffer structure provides buffering for the limit switch to prevent the limit switch from being damaged due to multiple collisions. Description of the drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the device for preventing collision with the cab of the present utility model.

[0015] Figure 2 It is a schematic diagram of the buffer structure of the present utility model;

[0016] Figure 3 It is a wiring diagram of the main limit switch, the first limit switch and the second limit switch of the present utility model.

[0017] Wherein: 1 - trolley track, 2 - main beam, 3 - cab, 4 - first limit switch, 5 - second limit switch, 6 - trolley limit switch, 7 - limit safety ruler, 8 - buffer structure, 80 - mounting base, 81 - fixing block, 82 - shock absorber, 83 - slider, 84 - connecting block, 9 - main limit switch, 10 - cross coupling, 11 - trolley platform, 12 - wire rope reel, 13 - wire rope, 14 - cross beam, 15 - manual switch. Specific embodiments

[0018] In combination with the embodiments below, the present utility model will be further described, but it does not constitute any limitation to the present utility model. Any person's limited modifications within the scope of the claims of the present utility model are still within the scope of the claims of the present utility model.

[0019] Referring to Figures 1-3 , a device for preventing the crane beam from lifting and hitting the cab of the present utility model includes a first limit switch 4 and a second limit switch 5. The first limit switch 4 is installed on the main beam 2 in front of the cab 3 through a buffer structure 8, and the second limit switch 5 is installed on the main beam 2 on the other side through a buffer structure 8. Moreover, the vertical distance between the cab 3 and the first limit switch 4 is greater than the vertical distance 9 between the cab 3 and the second limit switch 5, providing a double protection measure to prevent hitting the cab 3. Limit safety rulers 7 are respectively installed at both ends of the trolley platform 11.

[0020] The first limit switch 4 and the second limit switch 5 are used to control the on-off of the motor of the wire rope drum 12, and the limit safety ruler 7 is used to trigger the first limit switch 4 or the second limit switch 5 by collision when the trolley platform 11 approaches the first limit switch 4 or the second limit switch 5. The buffer structure 8 is used to provide a buffer when the limit safety ruler 7 triggers the first limit switch 4 or the second limit switch 5 and the limit switch is strongly impacted.

[0021] The power input end of the trolley platform 11 is electrically connected to the power supply through a series connection of a main limit switch 9, a first limit switch 4, and a second limit switch 5. The main limit switch 9, the first limit switch 4, and the second limit switch 5 are all normally closed limit switches. A manual switch 15 is electrically connected between the main limit switch 9 and the power supply. The manual switch 15 is used to manually turn on and off the power input of the trolley platform 11. Among them, the power input end of the trolley platform 11 supplies power to the driving components of the trolley platform 11 and the driving motor of the wire rope drum 12 at the same time.

[0022] When the main limit switch 9 is triggered, the main limit switch 9 disconnects, and the motor of the wire rope drum 12 stops working; when the first limit switch 4 is triggered, the first limit switch 4 disconnects, and the motor of the wire rope drum 12 stops working; when the second limit switch 5 is triggered, the second limit switch 5 disconnects, and the motor of the wire rope drum 12 stops working.

[0023] The buffer structure 8 includes a mounting base 80, a shock absorber 82, a connecting block 84 and a slider 83. A fixing block 81 integrally formed therewith is fixedly mounted above the mounting base 80. One end of the shock absorber 82 is fixedly mounted on one side of the fixing block 81, and the other end of the shock absorber 82 is fixedly connected to the first limit switch 4. The first limit switch 4 is slidably mounted on the mounting base 80 through the slider 83 to reduce the wear of the limit switch. Connecting blocks 84 are fixedly mounted at both ends of the bottom of the mounting base 80, and the connecting blocks 84 are fixedly mounted on the main beam 2. The shock absorber 82 is a spring. The buffer structure 8 is used to provide buffering for the limit switch when the limit safety ruler 7 triggers the first limit switch 4 or the second limit switch 5 and the limit switch is strongly impacted.

[0024] The working principle of the present utility model is as follows:

[0025] When the cross beam 14 reaches the highest position, the main limit travel switch 9 disconnects the hoisting and lowering control circuit. If the cross beam 14 does not reach the highest position and the trolley continues to move, there is a risk that the cross beam 14 will hit the cab 3.

[0026] When the trolley platform 11 continues to move and the limit safety ruler 7 collides with and contacts the first limit switch 4 to trigger the first limit switch 4, the first limit switch 4 disconnects, and the connection between the power input end of the trolley platform 11 and the external power supply is disconnected, so that the trolley stops running, the motor of the wire rope reel 12 stops working, and the cross beam 14 stops rising, avoiding the risk of collision between the cross beam 14 and the cab 3.

[0027] When the trigger of the first limit switch 4 is abnormal and it cannot be triggered by the limit safety ruler 7 in time, as the trolley platform 11 moves, the limit safety ruler 7 on the other side collides with and contacts the second limit switch 5 to trigger the second limit switch 5. The second limit switch 5 disconnects, and the connection between the power input end of the trolley platform 11 and the external power supply is disconnected, so that the trolley stops running. Similarly, the motor of the wire rope reel 12 stops working, and the cross beam 14 stops rising, avoiding the risk of collision between the cross beam 14 and the cab 3.

[0028] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which will not affect the implementation effect of the present utility model and the practicability of the patent.

Claims

1. A device for preventing the crane crossbeam from lifting and hitting the cab, characterized in that It includes a first limit switch (4) and a second limit switch (5). The first limit switch (4) is installed on the main beam (2) in front of the cab (3) through a buffer structure (8). The second limit switch (5) is installed on the main beam (2) on the other side through the buffer structure (8). And the vertical distance between the cab (3) and the first limit switch (4) is greater than the vertical distance (9) between the cab (3) and the second limit switch (5). Limit safety rulers (7) are respectively installed at both ends of the trolley platform (11).

2. The device for preventing the crane crossbeam from lifting and hitting the cab according to claim 1, characterized in that, The power input end of the trolley platform (11) is electrically connected to the power supply through a main limit switch (9), a first limit switch (4) and a second limit switch (5) connected in series.

3. The device for preventing the crane crossbeam from lifting and hitting the cab according to claim 2, characterized in that, The main limit switch (9), the first limit switch (4) and the second limit switch (5) are all normally closed limit switches.

4. A device for preventing the crane crossbeam from lifting and hitting the cab according to claim 3, characterized in that, A manual switch (15) is electrically connected between the main limit switch (9) and the power supply.

5. A device for preventing the crane beam from lifting and hitting the cab according to claim 1, characterized in that, The buffer structure (8) includes a mounting seat (80), a shock absorber (82), a connecting block (84) and a slider (83). A fixing block (81) integrally formed therewith is fixedly installed above the mounting seat (80). One end of the shock absorber (82) is fixedly installed on one side of the fixing block (81). The other end of the shock absorber (82) is fixedly connected to the first limit switch (4). The first limit switch (4) is slidably installed on the mounting seat (80) through the slider (83). Connecting blocks (84) are fixedly installed at both ends of the bottom of the mounting seat (80). The connecting blocks (84) are fixedly installed on the main beam (2).

6. The device for preventing the crane crossbeam from lifting and bumping against the cab according to claim 5, characterized in that, The shock absorber (82) is a spring.

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