Automatic brake of crane

Abstract

The utility model provides an automatic brake of a crane, which is mounted at a travelling wheel of the crane, the travelling wheel is driven by a motor, and the automatic brake comprises a stop dog hinged with a rack of the crane; a driving assembly and an elastic assembly which are opposite in driving direction are installed on the rack and drive the check block to rotate. During electrification, the driving assembly drives the stop block to be away from the walking wheel; when power is cut off, the elastic assembly drives the check block to press the traveling wheel through the elastic force of the elastic assembly, the speed of the traveling wheel is gradually reduced until the traveling wheel stops, and the elastic assembly stretches out and draws back repeatedly under the elastic force of the elastic assembly and the counter-acting force of the traveling wheel in the process. The brake has the advantages that due to the arrangement of the position of the check block, the structure of the brake is more compact, the size is reduced, and space is saved; 2, the travelling wheel is braked by the stop block under the condition of power failure, so that the situation that the travelling wheel cannot work due to power failure caused by severe weather in a working environment is avoided, and the stability is higher;

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to an automatic brake for a crane. Background Art

[0002] Outdoor cranes may accelerate and slide under strong winds, causing safety accidents, so brakes are generally installed on cranes.

[0003] Chinese patent CN213326498U discloses a crane brake, comprising two symmetrically arranged brake pads, which are driven by hydraulic electromagnets and clamp the crane wheels under the power transmission of the first connecting member, the second connecting member and the connecting shaft.

[0004] The above brake can only be used when the hydraulic electromagnet is powered on. In an environment with strong wind or ground vibration, power failure is likely to occur, causing the brake to lose its function. In addition, the arrangement of the connecting piece and the connecting shaft makes the above brake structure complex, large in size, and more expensive. Utility Model Content

[0005] In order to solve the technical problems in the background technology, the utility model discloses an automatic brake for a crane.

[0006] The utility model provides an automatic brake for a crane, which is installed at the running wheel of the crane, the running wheel is driven by a motor, comprises a stopper, and is hinged with the frame of the crane;

[0007] A driving assembly and an elastic assembly with opposite driving directions are installed on the frame to drive the stopper to rotate;

[0008] When the power is on, the drive assembly drives the block away from the running wheel;

[0009] When the power is off, the elastic component drives the block to press the running wheel through its elastic force, so that the speed of the running wheel gradually decreases until it stops. During this process, the elastic component repeatedly expands and contracts under its elastic force and the reaction force of the running wheel.

[0010] The beneficial effects of the utility model are: 1. The position setting of the block makes the brake structure more compact, reduces the volume and saves space; 2. The block brakes the running wheel in the case of power failure, and will not be unable to work due to power failure caused by bad weather in the working environment, and its stability is higher; 3. The elastic component makes the block elastic. When the block brakes the running wheel, sliding friction will be generated. Under the action of inertia of the running wheel, a component of its reaction force will drive the block to separate from the running wheel, so that the block will be repeatedly extended and retracted, and its friction force on the running wheel will also change repeatedly, thereby reducing wear and extending the service life.

[0011] The installation position of the stopper directly affects the difficulty of its installation. Based on this, a further design is that the stopper is located above the walking wheel and presses the walking wheel downward.

[0012] If the stopper presses the top of the walking wheel, its reaction force is perpendicular to the driving shaft. When the driving shaft is subjected to the reaction force, it will bend and will not shrink. Based on this, a further improvement is that the stopper contacts the upper part of the walking wheel and deviates from the top.

[0013] The driving component is generally a cylinder, which requires an air path, resulting in a complex structure. Based on this, a further improvement is that the driving component is set as a push-pull electromagnet. The elastic component is set as a spring.

[0014] The specific structure of the stopper articulation is: a support is installed on the frame, and the upper end of the stopper is articulated with the support through a connecting shaft; the stopper leads the driving block upward, and the driving shaft of the push-pull electromagnet is articulated with the driving block.

[0015] The installation position of the spring directly affects the movement stability of the drive shaft as well as the position stability and telescopic stability of the spring. Based on this, a further improvement is that the spring is sleeved on the drive shaft.

[0016] The contact area between the stopper and the running wheel directly affects the braking effect. Based on this, a further improvement is that the lower end face of the stopper is in an inferior arc shape, and when the stopper abuts against the running wheel, the lower end face fits with the running wheel.

[0017] The shape of the block directly affects the load of the drive shaft and the contraction stability of the drive shaft when it is subjected to the reaction force of the running wheel. Based on this, further improvements are: the end face of the block is triangular, and the tip opposite to the lower end face is hinged to the frame. With this arrangement, 1. The structure of the block is stable; 2. The volume of the block is reduced, the weight of the block is reduced, and thus the burden on the drive shaft is reduced; 3. The reaction force of the running wheel on the block is concentrated on the top of the block and directly acts on the lower drive shaft, making the contraction of the drive shaft stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is the front view of the utility model;

[0021] In the figure: 1. walking wheel; 2. stopper; 3. frame; 4. push-pull electromagnet; 5. spring; 6. support; 7. connecting shaft; 8. driving block; 9. driving shaft; 10. lower end surface; 11. travel switch. DETAILED DESCRIPTION

[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] like Figure 1 and Figure 2 As shown, the utility model discloses an automatic brake for a crane, which is installed on a frame 3 of the crane, near a running wheel 1 of the crane, and the running wheel 1 is driven to roll by a motor.

[0024] The frame 3 is provided with a horizontally arranged flat plate just above the walking wheel 1, and a driving assembly is installed on the upper end of the flat plate. The driving assembly can be, but is not limited to, a push-pull type electromagnet 4, or a cylinder.

[0025] One end of the flat plate is connected to a vertical side plate, on which a support 6 is mounted, and a stopper 2 is hinged on the support 6. The specific structure is as follows: the support 6 includes two symmetrical and spaced support plates, the stopper 2 is inserted between the support plates, and the connecting shaft 7 passes through one of the support plates, the stopper 2 and the other support plate in sequence, so that the stopper 2 is hinged.

[0026] The upper end of the stopper 2 leads to an integrally formed driving block 8, which is hinged to the driving shaft 9 of the push-pull electromagnet 4. When the push-pull electromagnet 4 is energized, the driving shaft 9 moves away from the stopper 2, so that the stopper 2 rotates and moves away from the running wheel 1.

[0027] The drive shaft 9 is also sleeved with an elastic component, specifically a spring 5. When the stopper 2 is away from the running wheel 1, the spring 5 is in a compressed state; when the push-pull electromagnet 4 loses power, the restoring force of the spring 5 drives the stopper 2 to rotate in the opposite direction, pressing the running wheel 1 downward. The arrangement of the spring 5 sleeved with the drive shaft 9 not only makes its position more stable and the extension more stable, but also makes it more stable to push the drive shaft 9 to move toward the stopper 2.

[0028] The stopper 2 is in contact with the upper part of the running wheel 1 and a position deviated from the top. The reaction force received by the stopper 2 forms an acute angle with the driving shaft 9. Therefore, one component of the reaction force will push the driving shaft 9 to stably contract.

[0029] The block 2 is triangular, and its lower end face 10 is inferior arc-shaped, which is equal to the radius of the running wheel 1, so that when the block 2 contacts the running wheel 1, the lower end face 10 fits with the running wheel 1, thereby increasing the contact area between the block 2 and the running wheel 1, increasing the friction force, and increasing the braking effect. In addition, the end face of the block 2 is triangular, which has the following advantages: 1. The structure of the block 2 is stable; 2. The volume of the block 2 is reduced, and the weight of the block 2 is reduced, thereby reducing the burden on the drive shaft 9; 3. The reaction force of the running wheel 1 on the block 2 is concentrated on the top of the block 2, and directly acts on the lower drive shaft 9, so that the contraction of the drive shaft 9 is stable.

[0030] An anemometer and a travel switch 11 are also installed on the frame 3. The travel switch 11 corresponds to the drive shaft 9. When the wind volume detected by the anemometer is too large, the push-pull electromagnet 4 will be controlled to be powered off, and the drive shaft 9 will move toward the block 2, and its rear end will be away from the travel switch 11. The travel switch 11 controls the motor to be powered off, and the running wheel 1 loses power and stops under the braking action of the block 2.

[0031] When the power is off, the spring 5 drives the stopper 2 to press the running wheel 1 through its elastic force, so that the speed of the running wheel 1 gradually decreases until it stops. During this process, the spring 5 repeatedly expands and contracts under its elastic force and the reaction force of the running wheel 1.

[0032] The beneficial effects of the utility model are: 1. The position setting of the block 2 makes the brake structure more compact, reduces the volume and saves space; 2. When the block 2 brakes the walking wheel 1 in the case of power failure, it will not be unable to work due to power failure caused by bad weather in the working environment, and its stability is higher; 3. The elastic component makes the block 2 elastic. When the block 2 brakes the walking wheel 1, sliding friction will be generated. Under the action of inertia, a component of the reaction force of the walking wheel 1 will drive the block 2 to separate from the walking wheel 1, so that the block 2 will be repeatedly extended and retracted, and its friction force on the walking wheel 1 will also change repeatedly, thereby reducing wear and extending the service life.

[0033] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A crane automatic brake, mounted on a running wheel (1) of the crane, wherein the running wheel (1) is driven by a motor, and characterized in that: It includes a stopper (2) hinged to a frame (3) of a crane; A driving component and an elastic component with opposite driving directions are installed on the frame (3) to drive the stopper (2) to rotate; When power is supplied, the driving assembly drives the stopper (2) away from the running wheel (1); When the power is off, the elastic component drives the stopper (2) to press the running wheel (1) through its elastic force, so that the speed of the running wheel (1) gradually decreases until it stops. During this process, the elastic component repeatedly expands and contracts under its elastic force and the reaction force of the running wheel (1).

2. The automatic brake of a crane according to claim 1, characterized in that: The stopper (2) is located above the running wheel (1) and presses the running wheel (1) downward.

3. The automatic brake of a crane according to claim 2, characterized in that: The stopper (2) contacts the upper portion of the running wheel (1) at a position deviating from the top.

4. The automatic brake of a crane according to claim 3, characterized in that: The driving component is configured as a push-pull electromagnet (4); The elastic component is configured as a spring (5).

5. The automatic brake of a crane according to claim 4, characterized in that: A support (6) is installed on the frame (3), and the upper end of the stopper (2) is hinged to the support (6) via a connecting shaft (7); The stopper (2) leads the driving block (8) upward, and the driving shaft (9) of the push-pull electromagnet (4) is hinged to the driving block (8).

6. The automatic brake of a crane according to claim 5, characterized in that: The spring (5) is sleeved on the driving shaft (9).

7. The automatic brake of a crane according to claim 3, characterized in that: The lower end surface (10) of the stopper (2) is in a bad arc shape, and when the stopper (2) abuts against the running wheel (1), the lower end surface (10) fits the running wheel (1).

8. The automatic brake of a crane according to claim 7, characterized in that: The end face of the stopper (2) is triangular, and the tip opposite to the lower end face (10) is hinged to the frame (3).

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