A second brake control system for a tower crane

Abstract

A second brake control system for a tower crane comprises: a second brake, arranged on a hoisting mechanism of the tower crane, comprising a brake mechanical component and a brake control component, the control end of the brake mechanical component cooperates with the oil circuit of the hoisting mechanism; the control end of the brake control component is connected to the brake mechanical component by signal; a detection unit, arranged on the second brake, comprising a gap sensor and a confirmation sensor, the signal output end of the gap sensor is connected to the signal input end of the hydraulic station detection unit by signal; the signal output end of the confirmation sensor is connected to the signal input end of the hydraulic station detection unit by signal; and a hydraulic station detection unit, arranged on the hoisting mechanism, the signal input end is connected to the signal output end of the confirmation sensor by signal; its signal output end is electrically connected to the signal input end of the brake control component through a control circuit. The beneficial effects of the present invention are: less strong impact on the tower crane during the second brake emergency stop, reduced failure rate and high safety.

Description

Technical Field

[0001] The invention relates to a second braking control system of a tower crane. Background Art

[0002] The hoisting mechanism of a tower crane usually uses one brake. Different countries and regions require the addition of a second brake on the hoisting mechanism, so a second brake control system needs to be added. If the existing second brake control system of a tower crane detects a fault during operation, it can not only make the first brake emergency stop, but also make the second brake system work at the same time, effectively ensuring the safety performance of the tower crane. Even if the first brake fails, the hoisting mechanism of the tower crane can be stopped by the emergency stop of the second brake. If the two brakes are braked at the same time, the impact on the structural parts of the tower crane is very large, thereby affecting the safety of the tower crane. In addition, the existing second brake control system is unstable in operation and has a high failure rate. Over time, serious equipment damage and injuries to personnel will occur. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a second brake control system for a tower crane which can reduce the strong impact on the tower crane during the second brake emergency stop and reduce the failure rate and has high safety.

[0004] The second braking control system of a tower crane according to the present invention is characterized by comprising:

[0005] The second brake is arranged on the hoisting mechanism of the tower crane, and includes a brake mechanical component and a brake control component, wherein the control end of the brake mechanical component cooperates with the oil circuit of the hoisting mechanism to control the on-off of the oil circuit of the hoisting component to achieve the braking of the tower crane; the control end of the brake control component is connected to the brake mechanical component signal to control the brake mechanical component to brake the tower crane;

[0006] The detection unit is arranged on the second brake, and includes a clearance sensor and a confirmation sensor. The detection end of the clearance sensor is located at the brake mechanical component of the second brake, and its signal output end is connected to the signal input end of the hydraulic station detection unit for detecting the wear degree of the brake shoe of the second brake; the signal output end of the confirmation sensor is connected to the signal input end of the hydraulic station detection unit for detecting whether the second brake is opened, and the confirmation opening signal of the second brake is transmitted to the hydraulic station detection unit to control the operation of the control circuit of the second brake control system;

[0007] And a hydraulic station detection unit is arranged on the lifting mechanism, and its signal input end is signal-connected with the signal output end of the confirmation sensor, so as to receive the confirmation signal of the confirmation sensor; its signal output end is electrically connected with the signal input end of the brake control component through the control circuit, so as to control the brake control component so that the brake mechanical component performs an opening or closing action.

[0008] A safety relay with a delay function is added to the second brake control system, and the delay time is 1.1 seconds to achieve normal stopping and emergency braking. The working response time of the second brake is shorter than that of the first brake of the first brake system.

[0009] The second brake control system is additionally provided with a second brake auxiliary relay with a delay function, which is used to control the closing action and time of the second brake system when the tower crane is working normally.

[0010] The detection unit also includes a pressure relay, a temperature monitoring sensor and a liquid level monitoring sensor. The signal output ends of the pressure relay, the temperature monitoring sensor and the liquid level monitoring sensor are signal-connected to the signal input end of the hydraulic station detection unit. The pressure relay is used to detect the current system pressure; the temperature monitoring sensor is used to detect the current hydraulic oil temperature; and the liquid level monitoring sensor is used to detect the current hydraulic oil level.

[0011] The control circuit includes a first brake power-off delay auxiliary circuit and a second brake auxiliary circuit, wherein the first brake power-off delay auxiliary circuit is provided with a plurality of first brake power-off delay auxiliary relays, and the second brake auxiliary circuit is provided with at least one second brake auxiliary relay, a safety relay and a second brake solenoid valve, wherein after the first brake power-off delay auxiliary relay is energized and attracted, the second brake auxiliary relay is energized and attracted, the safety relay will supply power to the second brake solenoid valve, and the second brake solenoid valve will change from a normally open state to a normally closed state after being energized, and the hydraulic oil reaches the spring-free chamber of the oil cylinder through the one-way valve, and the hydraulic pressure overcomes the force of the spring to perform the opening action.

[0012] The first brake auxiliary relay is in the normally open state when power is off; the second brake auxiliary relay and the second brake solenoid valve are both in the normally open state when power is off.

[0013] The beneficial effects of the second brake control system of the tower crane described in the present invention are mainly manifested in: 1. A gap sensor and a confirmation sensor for detecting the wear degree of the brake shoe are added to the second brake, so that the second brake can automatically stop after being worn to a certain extent, thereby improving the safety of the tower crane operation; 2. A safety relay with a delay function is added to the second brake control system, and after a delay of 1.1 seconds, normal stop and emergency braking are achieved, so that the working response time of the second brake is shorter than that of the first brake, and the second brake has less impact on the steel structure during emergency stop, thereby improving the safety performance of the tower crane and making the tower crane run more smoothly. 3. A relay with a delay function is also added to the second brake control system, so that the closing action and time of the second brake system can be controlled when the tower crane is working normally, reducing the unnecessary action of the second brake, increasing the service life of the second brake, and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a second braking position diagram of the tower crane of the present invention.

[0015] Figure 2 It is a layout diagram of the second brake control system of the tower crane of the present invention.

[0016] Figure 3 The electrical principle of the second brake control system of the tower crane of the present invention Figure 1 (CME2 gap sensor; CME3 confirmation sensor; KA1 oil temperature and liquid level relay; KA2 brake shoe detection relay; TS temperature monitoring sensor; HS liquid level monitoring sensor; SP pressure relay).

[0017] Figure 4 Electrical principle of the second brake control system of the tower crane of the present invention Figure 2 .

[0018] Figure 5 Electrical principle of the second brake control system of the tower crane of the present invention Figure 3 .

[0019] Figure 6 Electrical principle of the second brake control system of the tower crane of the present invention Figure 4 . DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings.

[0021] Refer to the attached figure:

[0022] Embodiment 1 A second braking control system for a tower crane according to the present invention comprises:

[0023] The second brake 1 is arranged on the hoisting mechanism of the tower crane, and includes a brake mechanical component and a brake control component, wherein the control end of the brake mechanical component cooperates with the oil circuit of the hoisting mechanism to control the on-off of the oil circuit of the hoisting component to achieve the braking of the tower crane; the control end of the brake control component is connected to the brake mechanical component signal to assist the first brake system in controlling the brake mechanical component to brake the tower crane;

[0024] The detection unit is arranged on the second brake, and comprises a clearance sensor CME2 and a confirmation sensor CME3. The detection end of the clearance sensor is located at the brake mechanical component of the second brake, and its signal output end is connected to the signal input end of the hydraulic station detection unit for detecting the wear degree of the brake shoe of the second brake; the signal output end of the confirmation sensor is connected to the signal input end of the hydraulic station detection unit for detecting whether the second brake is opened, and transmitting the confirmation opening signal of the second brake to the hydraulic station detection unit to control the operation of the control circuit of the second brake control system;

[0025] And a hydraulic station detection unit is arranged on the lifting mechanism, and its signal input end is signal-connected with the signal output end of the confirmation sensor, so as to receive the confirmation signal of the confirmation sensor; its signal output end is electrically connected with the signal input end of the brake control component through the control circuit, so as to control the brake control component so that the brake mechanical component performs an opening or closing action.

[0026] A safety relay RSFA with a delay function is added to the second braking control system, and the delay time is 1.1 seconds to achieve normal stop and emergency braking. The working response time of the second brake is shorter than the first brake of the first braking system, and the second brake has less impact on the steel structure during emergency stop, thereby improving the safety performance of the tower crane and making the tower crane run more smoothly.

[0027] The second brake control system is additionally provided with a second brake auxiliary relay (FSA1, FSA2) with a delay function, which is used to control the closing action and time of the second brake system when the tower crane is operating normally, thereby reducing unnecessary actions of the second brake, increasing the service life of the second brake and reducing the failure rate.

[0028] The detection unit also includes a pressure relay SP, a temperature monitoring sensor TS and a liquid level monitoring sensor HS. The signal output ends of the pressure relay SP, the temperature monitoring sensor TS and the liquid level monitoring sensor HS are signal-connected to the signal input end of the hydraulic station detection unit, wherein the pressure relay SP is used to detect the current system pressure; the temperature monitoring sensor TS is used to detect the current hydraulic oil temperature; and the liquid level monitoring sensor is used to detect the current hydraulic oil level.

[0029] The control circuit includes a first brake power-off delay auxiliary circuit and a second brake auxiliary circuit, wherein the first brake power-off delay auxiliary circuit is provided with a plurality of first brake power-off delay auxiliary relays, and the second brake auxiliary circuit is provided with at least one second brake auxiliary relay FSA1, FSA2, a safety relay RSFA and a second brake solenoid valve YV1, YV2, wherein after the first brake power-off delay auxiliary relay is energized and attracted, the second brake auxiliary relay FSA1, FSA2 is energized and attracted, the safety relay RSFA will supply power to the second brake solenoid valve, and the second brake solenoid valve YV1, YV2 is changed from a normally open state to a normally closed state after being energized, and the hydraulic oil reaches the spring-free chamber of the cylinder through the one-way valve, and the hydraulic pressure overcomes the force of the spring to perform the opening action.

[0030] The first brake auxiliary relay is in the normally open state when power is off; the second brake auxiliary relay and the second brake solenoid valve are both in the normally open state when power is off.

[0031] After the clearance sensor CME2 meets normal requirements, the second brake is opened, and the confirmation sensor CME3 receives a signal, and the entire system can operate normally.

[0032] Embodiment 2 Referring to the attached drawings: A second brake control system for a tower crane includes a second brake and a hydraulic station arranged on a hoisting mechanism, a clearance sensor CME2 arranged on the second brake for detecting the wear degree of the brake shoe, and a confirmation sensor CME3 arranged on the second brake for detecting whether the second brake is open. The clearance sensor CME2 is used to detect the wear degree of the brake shoe of the second brake, and the confirmation sensor CME3 is used to detect whether the second brake is open. When the clearance sensor CME2 meets the normal requirements, the second brake is open, and the confirmation sensor CME3 receives a signal, and the entire system can operate normally.

[0033] The second brake of the lifting mechanism is opened and running: After being energized, the second brake system detects the safety detection components of each part, such as: the pressure relay SP detects the current system pressure, the temperature monitoring sensor TS detects the current hydraulic oil temperature, the liquid level monitoring sensor HS detects the current hydraulic oil level, and the gap sensor CME2 detects the wear of the second brake shoe. When all the above conditions are met, the oil temperature and liquid level relay KA1 is closed, the allowable up and down relay PSB1 is energized, the second brake shoe detection relay KA2 is closed, and the second The braking system can be used normally. After the hydraulic station control system receives the opening signal that the second braking system can be used normally, the first brake power-off delay auxiliary relay (FA2, FA3, FA4) is energized and energized, and then the second brake auxiliary relay (FSA1, FSA2) is energized and energized. The safety relay RSFA will supply power to the second brake solenoid valve YV1 and YV2. The second brake solenoid valve (YV1, YV2) will change from normally open to normally closed after being energized. The hydraulic oil reaches the spring-free chamber of the cylinder through the one-way valve, and the hydraulic pressure overcomes the force of the spring to perform the opening action.

[0034] The second brake of the lifting mechanism is closed and running: the first brake auxiliary relay FA4 loses power, and after a delay of 1.1 seconds, the safety relay RSFA stops outputting, the second brake auxiliary relay (FSA1, FSA2) is de-energized, the second brake solenoid valve (YV1, YV2) is de-energized, and the state changes from normally closed to normally open. The pressure oil flows back to the oil tank through the second brake solenoid valve (YV1, YV2) under the action of the spring, and the disc spring applies braking force to achieve the closing of the second brake.

[0035] The power-off delay time of the first brake power-off delay auxiliary relay (FA2, FA3) can be adjusted. The adjusted time is the gate opening holding time to avoid frequent opening and closing of the second brake.

[0036] The contents described in the embodiments of this specification are merely an enumeration of implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the inventive concept.

Claims

1. A second braking control system for a tower crane, characterized in that: include: The second brake is arranged on the hoisting mechanism of the tower crane, and includes a brake mechanical component and a brake control component, wherein the control end of the brake mechanical component cooperates with the oil circuit of the hoisting mechanism to control the on-off of the oil circuit of the hoisting component to achieve the braking of the tower crane; the control end of the brake control component is connected to the brake mechanical component signal to control the brake mechanical component to brake the tower crane; The detection unit is arranged on the second brake, and includes a clearance sensor and a confirmation sensor. The detection end of the clearance sensor is located at the brake mechanical component of the second brake, and its signal output end is connected to the signal input end of the hydraulic station detection unit for detecting the wear degree of the brake shoe of the second brake; the signal output end of the confirmation sensor is connected to the signal input end of the hydraulic station detection unit for detecting whether the second brake is opened, and the confirmation opening signal of the second brake is transmitted to the hydraulic station detection unit to control the operation of the control circuit of the second brake control system; and a hydraulic station detection unit, which is arranged on the lifting mechanism and has a signal input end connected to a signal output end of the confirmation sensor for receiving a confirmation signal from the confirmation sensor; Its signal output end is electrically connected to the signal input end of the brake control component through the control circuit, and is used to control the brake control component so that the brake mechanical component performs an opening or closing action; A safety relay with a delay function is added to the second brake control system, and the delay time is 1.1 seconds to achieve normal stopping and emergency braking. The working response time of the second brake is shorter than that of the first brake of the first brake system; The control circuit includes a first brake power-off delay auxiliary circuit and a second brake auxiliary circuit, wherein the first brake power-off delay auxiliary circuit is provided with a plurality of first brake power-off delay auxiliary relays, and the second brake auxiliary circuit is provided with at least one second brake auxiliary relay, a safety relay and a second brake solenoid valve, wherein after the first brake power-off delay auxiliary relay is energized and attracted, the second brake auxiliary relay is energized and attracted, the safety relay will supply power to the second brake solenoid valve, and the second brake solenoid valve will change from a normally open state to a normally closed state after being energized, and the hydraulic oil reaches the spring-free chamber of the oil cylinder through the one-way valve, and the hydraulic pressure overcomes the force of the spring to perform the opening action.

2. The second brake control system of a tower crane according to claim 1, characterized in that: The second brake control system is additionally provided with a second brake auxiliary relay with a delay function, which is used to control the closing action and time of the second brake system when the tower crane is working normally.

3. The second brake control system of a tower crane according to claim 1, characterized in that: The detection unit also includes a pressure relay, a temperature monitoring sensor and a liquid level monitoring sensor. The signal output ends of the pressure relay, the temperature monitoring sensor and the liquid level monitoring sensor are signal-connected to the signal input end of the hydraulic station detection unit. The pressure relay is used to detect the current system pressure; the temperature monitoring sensor is used to detect the current hydraulic oil temperature; and the liquid level monitoring sensor is used to detect the current hydraulic oil level.

4. The second brake control system of a tower crane according to claim 1, characterized in that: The first brake auxiliary relay is in the normally open state when power is off; the second brake auxiliary relay and the second brake solenoid valve are both in the normally open state when power is off.

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