Safety protection device for crane brake

Abstract

The utility model discloses a safety protection device for a crane brake, which relates to the technical field of protection devices and comprises a protection device, a power line extending to the outer side of the protection device is connected inside the protection device, and an induction contact for inducting a metal object is mounted on the other side of the protection device. The interior of the induction contact is connected with a data line extending into the protection device to achieve transmission of electric signals, a cavity is formed in the protection device, a power source is installed in the cavity, the power source is connected with the protection device, and a circuit breaker and an intermediate relay are further installed on one side of the power source. According to the utility model, the protection device and the induction contact are arranged, the circuit of the mechanism can be interlocked after the induction contact acts, at the moment, the crane can only do descending action to put down a heavy object, all the control contacts finish safety protection, and a fault buzzer is used for reminding an operator in an operation room to operate after the compensation stroke needs to be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of protection devices, and particularly relates to a safety protection device for a crane brake. Background Art

[0002] The brake is an essential part of a large crane. During the use of the brake, inspection is an essential task. When the inspection is not in place, there is a risk of out-of-control and hook slipping. I personally think that the safety protection measures of the brake are not perfect, there are certain safety hazards. To avoid the occurrence of safety hazards, an automatic safety protection device is installed to make the brake safer. Content of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide a safety protection device for a crane brake to solve the technical problems mentioned in the above background.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A safety protection device for a crane brake, including a protection device. A power cord extending to the outside of the protection device is connected inside the protection device, and an induction contact for sensing metal objects is installed on the other side of the protection device. A data line extending into the protection device is connected inside the induction contact to achieve the transmission of electrical signals. A cavity is opened inside the protection device, and a power supply is installed in the cavity. The power supply is connected to the protection device, and a circuit breaker and an intermediate relay are also installed on one side of the power supply.

[0005] By adopting the above technical solution, after the induction contact acts, the mechanism circuit will be interlocked. At this time, the crane can only perform the descending action to lower the heavy object. All control contacts complete the safety protection, and a fault buzzer is used to give a reminder to the operator in the operation room. It is necessary to adjust the compensation stroke before operation.

[0006] The utility model is further arranged such that a fault buzzer is also installed inside the cavity to achieve an alarm in case of a fault.

[0007] By adopting the above technical solution, it plays an indicating effect in the fault state of the brake.

[0008] The utility model is further arranged such that a normal indicator light is also installed inside the cavity to achieve the indication of the normal working state.

[0009] By adopting the above technical solution, it plays an indicating effect in the normal working state.

[0010] The utility model is further arranged such that the induction contact, the intermediate relay, the fault buzzer and the normal indicator light are all electrically connected to the circuit breaker.

[0011] By adopting the above technical solution, the electric control effect on the fault buzzer and the normal indicator light is achieved.

[0012] The utility model is further arranged such that a fault type label is pasted on the outer wall of the protection device at the installation position of the fault buzzer.

[0013] By adopting the above technical solution, the effect of quickly identifying the fault type is achieved, and the maintenance efficiency is improved.

[0014] In summary, the utility model mainly has the following beneficial effects:

[0015] By setting the protection device in the utility model, after the brake friction plate wears down to the specified value, an induction contact is installed on the side of the brake arm. When the induction distance is less than 15 mm, the induction contact acts; during normal operation, the induction distance between the induction contact and the metal object is more than 15 mm, so the state is a safe state. In the safe state, the induction contact has no output, and the intermediate relay is in a static state. At this time, the green indicator light is connected in series with the normally closed contact of the intermediate relay and is always on;

[0016] After the induction contact is triggered, the KA intermediate relay is energized, the normally open contact of KA closes, and the fault buzzer is energized to emit a prompt warning sound. The normally closed contact of KA disconnects, and in the loop of the contact interlocking control of this mechanism, only the lowering action can be performed at this time, and the heavy object is placed in a safe position;

[0017] When the induction contact senses the metal baffle, it automatically feeds back a signal to the normally open contact of the intermediate relay to close, and the buzzer in the operation room is energized to emit a prompt sound to remind the operator that there is a fault to be processed. The label marked with (brake fault) is placed at the installation position of the buzzer. At this time, professional maintenance personnel can quickly find the cause of the fault and adjust the compensation stroke to reach the specified value to eliminate the fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 is a schematic diagram of the structure of the protection device of the utility model;

[0020] Figure 3 is a schematic circuit diagram of the utility model.

[0021] In the figure: 1. Protection device; 2. Power cord; 3. Induction contact; 4. Data line; 5. Cavity; 6. Power supply; 7. Circuit breaker; 8. Intermediate relay; 9. Fault buzzer; 10. Normal indicator light. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0023] The following will describe the embodiments according to the overall structure of the present utility model.

[0024] A safety protection device for a crane brake, as Figure 1-2 shown, includes a protection device 1. A power cord 2 extending to the outside of the protection device 1 is connected inside the protection device 1. On the other side of the protection device 1, an induction contact 3 (model LJ12A3-4-2-AX) for sensing metal objects is installed. Inside the induction contact 3, a data line 4 extending to the inside of the protection device 1 is connected to achieve the transmission of electrical signals. A cavity 5 is provided inside the protection device 1, and a power supply 6 (model S-35-24DC24V) is installed in the cavity 5. The power supply 6 is connected to the protection device 1, and a circuit breaker 7 (model DZ47-63) and an intermediate relay 8 (model MY2N-GS24VDC) are also installed on one side of the power supply 6;

[0025] Furthermore, in this embodiment, a fault buzzer 9 (model AD16-22Sm220V) is also installed inside the cavity 5 to achieve an alarm in case of a fault, and a normal indicator light 10 (model AD16-22DS220V) is also installed inside the cavity 5 to indicate the normal working state.

[0026] Please refer to Figure 1-2 , the induction contact 3, the intermediate relay 8, the fault buzzer 9, and the normal indicator light 10 are all electrically connected to the circuit breaker 7 to achieve the electrical control of the fault buzzer 9 and the normal indicator light 10.

[0027] Please refer to Figure 1 , a fault type label is pasted on the outer wall of the protection device 1 at the installation position of the fault buzzer 9 to assist maintenance personnel in quickly judging the fault type, thereby improving the maintenance efficiency.

[0028] The working principle of the present utility model is as follows: After the wear of the brake friction plate is reduced to the specified value, the induction contact 3 is installed on the side of the brake arm. When the induction distance is less than 15 mm, the induction contact acts;

[0029] Specifically, during normal operation, the induction distance between the induction contact 3 and the metal object is more than 15 mm, so the state is a safe state. In the safe state, the induction contact 3 has no output, and the intermediate relay 7 is in a static state. At this time, the normal indicator light 10 is connected to the normally closed contact of the intermediate relay 7 and is always on;

[0030] After the induction contact 3 operates, the intermediate relay KA7 is energized, the normally open contact of KA closes, the fault buzzer 9 is energized to emit a prompt warning sound, and the normally closed contact of KA disconnects. At this time, only the lowering action can be performed in the loop where this contact interlocks and controls the mechanism, and the heavy object is placed in a safe position;

[0031] When the induction contact 3 senses the metal baffle, it automatically feeds back a signal to the normally open contact of the intermediate relay 7 to close. The buzzer 9 in the operation fault chamber is energized to emit a prompt sound to remind the operator that there is a fault to be handled. There is a label (brake fault) at the installation position of the fault buzzer 9. At this time, professional maintenance personnel can quickly find the cause of the fault and adjust the compensation stroke to reach the specified value to eliminate the fault.

[0032] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and do not limit the present invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can, without departing from the principle and purpose of the present invention, make modifications, substitutions and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A crane brake safety protection device, comprising a protection device (1), characterized in that: The protection device (1) is internally connected to a power line (2) extending to the outside of the protection device (1), and a sensing contact (3) for sensing metal objects is installed on the other side of the protection device (1), and the sensing contact (3) is internally connected to a data line (4) extending to the inside of the protection device (1) to achieve transmission of electrical signals. The protection device (1) is internally provided with a cavity (5), and a power source (6) is installed in the cavity (5). The power source (6) is connected to the protection device (1), and a circuit breaker (7) and an intermediate relay (8) are also installed on one side of the power source (6).

2. A crane brake safety protection device according to claim 1, characterized in that: A fault buzzer (9) is also installed inside the cavity (5) to provide an alarm in case of a fault.

3. A crane brake safety protection device according to claim 2, characterized in that: A normal indicator light (10) is also installed inside the cavity (5) to indicate a normal working state.

4. A crane brake safety protection device according to claim 3, characterized in that: The inductive contact (3), the intermediate relay (8), the fault buzzer (9) and the normal indicator light (10) are all electrically connected to the circuit breaker (7).

5. A crane brake safety protection device according to claim 2, characterized in that: A fault type label is pasted on the outer wall of the protection device (1) at the installation position of the fault buzzer (9).

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