Brake shoe clearance protection testing device of elevator braking system

Abstract

The utility model provides a brake shoe gap protection testing device for a brake system of an elevator, which belongs to the electromechanical field of coal mines and comprises a gap sensor, a resistor R1, a resistor R2, a selection button SA1, a button SB2, a button SB3, an indicator light LH1 and an indicator light LH2. The resistor R2 is connected in parallel between the third terminal and the second terminal of the gap sensor, and the current of the gap sensor is changed through the shunting effect of the resistor R1 and the resistor R2, so that the air gap value of the brake shoe is changed, and the test requirements of brake shoe gap protection that a brake shoe wear fault is reported when the air gap value of the brake shoe is larger than 2.0 mm and a brake loosening fault is reported when the air gap value is smaller than 1.0 mm are met. The test can be carried out without disconnecting the wiring terminal of the brake gap sensor or moving the position of the gap sensor, the principle is simple, the brake shoe gap protection action value can be accurately reflected, and the protection test response is rapid, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of coal mine electromechanical technology, in particular to a brake shoe gap protection test device for a hoist braking system. Background Art

[0002] Mine hoisting equipment is a large-scale mechanical equipment that enables personnel to be lifted and lowered, materials to be lifted and lowered, and is a key hub connecting the underground production system of the mine and the ground work square. Mine hoists are mechanical equipment driven by motors to drive wire ropes and thus drive containers to be lifted and lowered in the shaft to complete the transportation task. Mine hoists are one of the important equipment for safe production in coal mines. The brake shoe gap is a key parameter to measure whether the braking system can work safely and reliably, and determines the braking performance of the hoist. According to Article 423 of the "Coal Mine Safety Regulations" on the setting requirements of the safety protection device of the vertical shaft hoisting system, the vertical shaft hoisting system must have a brake shoe gap protection function, including brake shoe wear alarm and loose brake alarm.

[0003] When testing the brake shoe gap protection during routine maintenance, the test methods used by various mines are to disconnect the brake shoe gap sensor terminals or manually move the gap sensor position for testing. The test method of disconnecting the brake shoe gap sensor terminals can only respond to the gap sensor disconnection fault, so it cannot truly reflect the change of the brake shoe gap. The test method of manually moving the gap sensor position requires at least two people to cooperate in the test, which is cumbersome to operate. In addition, when the gap sensor is restored, a fault alarm may be triggered due to an inappropriate position, and even a fault jump may occur during operation. It is necessary to readjust and reposition the gap sensor, which poses a great safety risk. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to design a brake shoe gap protection test device that is safer, more accurate and more convenient.

[0005] The utility model solves the above technical problems through the following technical solutions: a brake shoe gap protection test device for a hoist braking system, comprising a gap sensor, a resistor R1, a resistor R2, a selection button SA1, a button SB2, a button SB3, an indicator light LH1 and an indicator light LH2, the gap sensor is located on the brake shoe, a first terminal of the gap sensor is connected to one end of the selection button SA1, the other end of the selection button SA1 is connected to one end of the button SB2 after being connected in series with the resistor R1, the other end of the button SB2 is connected to the second terminal of the gap sensor, the third terminal of the gap sensor is connected to one end of the selection button SA1, the other end of the selection button SA1 is connected to one end of the button SB3 after being connected in series with the resistor R2, the other end of the button SB3 is connected to the second terminal of the gap sensor, the indicator light LH1 is connected in series with the button SB2 and connected between the first terminal and the third terminal of the gap sensor, and the indicator light LH2 is connected in series with the button SB3 and connected between the first terminal and the third terminal of the gap sensor.

[0006] The utility model connects a resistor R1 in parallel between the first terminal and the second terminal of the gap sensor, and connects a resistor R2 in parallel between the third terminal and the second terminal of the gap sensor, and changes the current of the gap sensor through the shunting effect of the resistors R1 and R2, thereby changing the brake shoe air gap value, meeting the test requirements of brake shoe gap protection that when the brake shoe air gap value is greater than 2.0mm, a brake shoe wear fault is reported, and when it is less than 1.0mm, a loose brake fault is reported. There is no need to disconnect the wiring terminals of the gate gap sensor, and there is no need to move the position of the gap sensor for testing. The principle is simple, and the brake shoe gap protection action value can be accurately reflected. The protection test response is fast, safe and reliable.

[0007] Preferably, the first terminal of the gap sensor is connected to a 24V DC voltage, the second terminal is a 4-20mA current signal, the corresponding air gap value is 0-5mm, and the third terminal is 0V.

[0008] Preferably, the resistor R1 and the resistor R2 are fixed-value resistors, the resistance value of the resistor R1 is 8.2KΩ, and the resistance value of the resistor R2 is 1KΩ.

[0009] Preferably, the selection button SA1 includes two modes: brake shoe wear protection test and brake shoe tightness protection test.

[0010] Preferably, the two brake shoes are respectively installed on both sides of the brake disc of the hoist braking system, and a gap sensor is installed on each brake shoe.

[0011] Preferably, the gap sensor is installed at the tail of the brake head of the brake shoe, and its measuring end face is the end face of the oil cylinder inside the brake head.

[0012] Preferably, it also includes an inductive iron sheet, which is located on the brake shoe, and the gap sensor corresponds to the inductive iron sheet.

[0013] Preferably, it also includes an analog quantity module and a control module, wherein the input end of the analog quantity module is connected to the gap sensor, and the output end is connected to the control module.

[0014] Preferably, the model of the gap sensor is DW-AD-509-M18-325.

[0015] The advantages provided by the utility model are:

[0016] 1. The utility model connects a resistor R1 in parallel between the first terminal and the second terminal of the gap sensor, and connects a resistor R2 in parallel between the third terminal and the second terminal of the gap sensor, and changes the current of the gap sensor through the shunting effect of the resistors R1 and R2, thereby changing the brake shoe air gap value, meeting the test requirements of the brake shoe gap protection that when the brake shoe air gap value is greater than 2.0mm, a brake shoe wear fault is reported, and when it is less than 1.0mm, a loose brake fault is reported. There is no need to disconnect the wiring terminals of the gate gap sensor, and there is no need to move the position of the gap sensor for testing. The principle is simple, and the brake shoe gap protection action value can be accurately reflected. The protection test response is fast, safe and reliable.

[0017] 2. By selecting fixed value resistors, the resistance value of resistor R1 is selected as 8.2KΩ, and the resistance value of resistor R2 is selected as 1KΩ. This can not only meet the test requirements, but also avoid burning out the analog module when the parallel resistance value is small during the test, thereby ensuring the safety of the system test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit schematic diagram of a brake shoe gap protection test device for a hoist braking system provided by the utility model;

[0019] Figure 2 The wiring diagram of the brake shoe gap protection test device for the hoist braking system provided by the utility model;

[0020] Figure 3 The utility model provides a characteristic curve diagram of the gap sensor in the brake shoe gap protection test device of the hoist braking system. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution of the utility model is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-2As shown, this embodiment provides a brake shoe gap protection test device for a hoist braking system, including a gap sensor 1, a resistor R1, a resistor R2, a selection button SA1, a button SB2, a button SB3, an indicator light LH1 and an indicator light LH2, the gap sensor 1 is located on the brake shoe 2, the first terminal of the gap sensor 1 is connected to one end of the selection button SA1, the other end of the selection button SA1 is connected to one end of the button SB2 after being connected in series with the resistor R1, the other end of the button SB2 is connected to the second terminal of the gap sensor 1, the third terminal of the gap sensor 1 is connected to one end of the selection button SA1, the other end of the selection button SA1 is connected to one end of the button SB3 after being connected in series with the resistor R2, the other end of the button SB3 is connected to the second terminal of the gap sensor 1, the indicator light LH1 is connected in series with the button SB2 and connected between the first terminal and the third terminal of the gap sensor 1, and the indicator light LH2 is connected in series with the button SB3 and connected between the first terminal and the third terminal of the gap sensor 1.

[0023] Among them, the selection button SA1 includes two modes: brake shoe wear protection test and brake shoe loose and tight gate protection test. The brake shoe wear protection test and brake shoe loose and tight gate protection test can be selected by turning SA1. Button SB2 is the brake shoe wear protection test execution button. When button SB2 is pressed, the circuit where the indicator light LH1 is located is connected, and the brake shoe wear protection test is displayed. The indicator light LH1 is the brake shoe wear protection test input indicator. Button SB3 is the loose and tight gate protection test execution button. When button SB3 is pressed, the circuit where the indicator light LH2 is located is connected, and the loose and tight gate protection test is displayed. The indicator light LH2 is the loose and tight gate protection test indicator. Resistor R1 is the parallel resistor of the brake shoe wear protection test, and resistor R2 is the parallel resistor of the loose and tight gate protection test.

[0024] The terminal box of gap sensor 1 has terminals 1, 2, 3 and 4, 5, 6. Each set of gates has two pairs of gates, such as Figure 1 As shown, a brake shoe 2 is installed on each side of the brake disc 3 of the hoist braking system, and each brake shoe 2 is installed with a gap sensor 1, wherein terminals 1, 2, and 3 are the gap sensor connection terminals of one of the brakes, and terminals 4, 5, and 6 are the gap sensor connection terminals of the other brake.

[0025] Resistors R1 and R2 are fixed resistors. The reason for choosing fixed resistors is that if adjustable resistors are used, when performing brake shoe wear protection tests, if the parallel resistance is very small due to improper operation, it will cause an accident in which the analog module 4 is burned out due to excessive current. Therefore, choosing fixed resistors ensures both the normal execution of the test function and the safety of the system.

[0026] The resistance value of resistor R1 is 8.2KΩ, and the resistance value of resistor R2 is 1KΩ. Terminals 1, 2, and 3 are used as an example for introduction. Terminals 1, 2, and 3 are respectively connected to the gate seat junction box. The first terminal of the gap sensor 1 is connected to a 24V DC voltage, the second terminal is a 4-20mA current signal, and the corresponding air gap value is 0-5mm. The third terminal is 0V, and the current value corresponding to each 1mm is: (20-4) / (5-0)=3.2mA.

[0027] The brake system brake gap program protection setting is set that when the brake shoe air gap value is greater than 2.0mm, the brake shoe wear fault is reported, and when it is less than 1.0mm, the loose brake fault is reported. In order to ensure the safety and reliability of the braking system, the actual brake shoe air gap is displayed between 1.2mm-1.8mm. The rated working voltage of the current type gap sensor is 24V, and the rated working current is 4-20mA.

[0028] When the brake shoe gap is the minimum value of 1.2mm, it is hoped that the gate gap is greater than 2mm when testing the brake shoe wear protection, and the gate gap needs to be increased by 0.8mm. Similarly, when the gate gap is the maximum value of 1.8mm, it is hoped that the gate gap is less than 1mm when testing the loose gate protection, and the gate gap needs to be reduced by 0.8mm. When the gate gap value changes by 0.8mm, the corresponding current change value is: 0.8mm×3.2mA / mm=2.56mA. By consulting the manual of the gap sensor and ABB analog input module, according to Kirchhoff's current law and actual experiments, it can be known that when a resistor with a resistance of 8KΩ is connected in parallel between the first terminal and the second terminal of the gap sensor 1 (since the resistor specification in actual work is only 8.2KΩ, 8.2KΩ is actually selected), the additional current value is 2.51mA, and when a resistor with a resistance of 1KΩ is connected in parallel between the third terminal and the second terminal of the gap sensor 1, the additional current value is -2.66mA, which fully meets the test requirements.

[0029] like Figure 3 As shown, the current value of the gap sensor measured when the gate is open is about 8mA, and the corresponding gate gap value is 1.25mm. The current value of the gap sensor measured when the gate is applied is about 13.2mA. When the selection button SA1 is selected as the brake shoe wear protection test, the button SB2 is pressed at the same time to perform the brake shoe wear protection test. At this time, the indicator light LH1 is on, the additional current value is 2.51mA, and the gap sensor current is 13.2mA+2.51mA=15.71mA. Figure 3 From the characteristic curve of the gap sensor shown, it can be seen that the corresponding gate gap value is 3.66mm. At this time, the gate gap is displayed as 3.66-1.25=2.4mm, which is greater than 2mm. The gate control host computer reports a brake shoe wear fault alarm information.

[0030] When the rotary button SA1 is selected for the brake shoe tightness gate protection test, press the button SB3 at the same time to execute the brake shoe tightness gate protection test, the indicator light LH2 lights up, the additional current value is -2.66mA, the gap sensor current is 13.2-2.66=10.54mA, and the corresponding gate gap value is 2.04mm. At this time, the gate gap is displayed as 2.04-1.25=0.8mm, which is less than 1mm, and the gate control host computer reports a loose gate fault alarm message.

[0031] The gap sensor 1 is installed at the rear of the brake head of the brake shoe 2, and its measuring end face is the end face of the oil cylinder inside the brake head. It also includes a sensing iron sheet, which is located on the brake shoe 2, and the gap sensor 1 corresponds to the sensing iron sheet.

[0032] The gap sensor 1 is a high-precision inductive displacement linear sensor, which is convenient for higher measurement accuracy, higher performance, and safer and more reliable to use. The model of the gap sensor of the utility model is DW-AD-509-M18-325.

[0033] It also includes an analog module 4 and a control module. The input end of the analog module 4 is connected to the gap sensor 1, and the output end is connected to the control module. The gap sensor 1 converts the measured data into a current signal and transmits it to the analog module 4. The analog module 4 converts the received current signal into a digital quantity and the digital quantity is read by the control module. The control module performs data processing and logic operations after reading the data.

[0034] The utility model connects a resistor R1 in parallel between the first terminal and the second terminal of the gap sensor, connects a resistor R2 in parallel between the third terminal and the second terminal of the gap sensor, and changes the current of the gap sensor through the shunt effect of the resistors R1 and R2, thereby changing the brake shoe air gap value, meeting the test requirements of the brake shoe gap protection that when the brake shoe air gap value is greater than 2.0mm, a brake shoe wear fault is reported, and when it is less than 1.0mm, a loose gate fault is reported. There is no need to disconnect the wiring terminal of the gate gap sensor, and there is no need to move the gap sensor position for testing. The principle is simple and can accurately reflect the brake shoe gap protection action value. By selecting a fixed value resistor, the resistance value of the resistor R1 is selected as 8.2KΩ, and the resistance value of the resistor R2 is selected as 1KΩ, which can not only meet the test requirements, but also avoid burning the analog module when the parallel resistance value is small during the test, thereby ensuring the safety of the system test. By setting the selection button SA1, two modes of brake shoe wear protection test and brake shoe loose gate protection test can be selected, and the brake shoe wear protection and loose gate protection can be tested separately, and the indicator light can indicate whether the test is effectively put into operation. The device has been promoted and applied in the protection test of the brake system of the hoisting winch in the vertical shaft of Xieqiao Coal Mine of Huainan Mining Group. The protection test has a fast response and is safe and reliable.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brake shoe clearance protection test device for a hoist braking system, characterized in that: The invention comprises a gap sensor (1), a resistor R1, a resistor R2, a selection button SA1, a button SB2, a button SB3, an indicator light LH1 and an indicator light LH2. The gap sensor (1) is located on a brake shoe (2). The first terminal of the gap sensor (1) is connected to one end of the selection button SA1. The other end of the selection button SA1 is connected in series with the resistor R1 and then connected to one end of the button SB2. The other end of the button SB2 is connected to the second terminal of the gap sensor (1). The third terminal of the gap sensor (1) is connected to one end of the selection button SA1. The other end of the selection button SA1 is connected in series with the resistor R2 and then connected to one end of the button SB3. The other end of the button SB3 is connected to the second terminal of the gap sensor (1). The indicator light LH1 is connected in series with the button SB2 and then connected between the first terminal and the third terminal of the gap sensor (1). The indicator light LH2 is connected in series with the button SB3 and then connected between the first terminal and the third terminal of the gap sensor (1).

2. The hoist brake system brake shoe gap protection test device according to claim 1, characterized in that: The first terminal of the gap sensor (1) is connected to a 24V DC voltage, the second terminal is a 4-20mA current signal, the corresponding air gap value is 0-5mm, and the third terminal is 0V.

3. The hoist brake system brake shoe gap protection test device according to claim 2, characterized in that: The resistor R1 and the resistor R2 are fixed value resistors, the resistance value of the resistor R1 is 8.2KΩ, and the resistance value of the resistor R2 is 1KΩ.

4. The hoist brake system brake shoe gap protection test device according to claim 1, characterized in that: The selection button SA1 includes two modes: brake shoe wear protection test and brake shoe tightness protection test.

5. The hoist brake system brake shoe gap protection test device according to claim 1, characterized in that: The two brake shoes (2) are respectively installed on the two sides of the brake disc of the hoist braking system, and a gap sensor (1) is installed on each brake shoe (2).

6. The hoist brake system brake shoe gap protection test device according to claim 5, characterized in that: The gap sensor (1) is installed at the rear of the brake head of the brake shoe (2), and its measuring end face is the end face of the oil cylinder inside the brake head.

7. The hoist brake system brake shoe gap protection test device according to claim 6, characterized in that: It also includes an inductive iron sheet, which is located on the brake shoe (2), and the gap sensor (1) corresponds to the inductive iron sheet.

8. The hoist brake system brake shoe gap protection test device according to claim 1, characterized in that: It also includes an analog quantity module (4) and a control module. The input end of the analog quantity module (4) is connected to the gap sensor (1), and the output end is connected to the control module.

9. The hoist brake system brake shoe gap protection test device according to claim 1, characterized in that: The model of the gap sensor (1) is DW-AD-509-M18-325.

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