阅读说明：本技术 一种本安型电极式堆煤保护装置 (Intrinsic safety type electrode type coal piling protection device ) 是由 董强 刘国梁 孔凡勇 孔凡站 于 2020-07-10 设计创作，主要内容包括：本发明提出的一种本安型电极式堆煤保护装置,包括：装置本体,所述装置本体以预设高度悬挂在堆煤点的正上方,装置本体上连接有上探头和下探头,所述上探头悬空设置在装置本体的正下方,上探头的底部高度与预设的堆煤安全高度相同,下探头固定安装在溜槽上,下探头的触点与溜槽的铁外壳连接；所述装置本体内设有控制电路,所述控制电路内设有用于控制皮带输送机开关的主控继电器,上探头和下探头通过控制电路电连接。本发明能够解决现有技术中因堆煤保护传感器探头不动作或动作不到位,而不能起到正常保护作用的问题。(The invention provides an intrinsic safety type electrode coal piling protection device, which comprises: the device comprises a device body, wherein the device body is suspended right above a coal piling point at a preset height, an upper probe and a lower probe are connected to the device body, the upper probe is suspended right below the device body, the bottom height of the upper probe is the same as the preset coal piling safety height, the lower probe is fixedly arranged on a chute, and a contact of the lower probe is connected with an iron shell of the chute; the device is characterized in that a control circuit is arranged in the device body, a main control relay used for controlling the switch of the belt conveyor is arranged in the control circuit, and the upper probe and the lower probe are electrically connected through the control circuit. The invention can solve the problem that the normal protection function cannot be realized due to the fact that the coal pile protects the probe of the sensor from moving or the sensor does not move in place in the prior art.)

1. An intrinsic safety type electrode coal piling protection device is characterized by comprising: the device comprises a device body, wherein the device body is suspended right above a coal piling point at a preset height, an upper probe and a lower probe are connected to the device body, the upper probe is suspended right below the device body, the bottom height of the upper probe is the same as the preset coal piling safety height, the lower probe is fixedly arranged on a chute, and a contact of the lower probe is connected with an iron shell of the chute; the device is characterized in that a control circuit is arranged in the device body, a main control relay used for controlling the switch of the belt conveyor is arranged in the control circuit, and the upper probe and the lower probe are electrically connected through the control circuit.

2. The intrinsically safe electrode coal pile protection device of claim 1, wherein the control circuit comprises: the device comprises a main control relay J, a transformer T, a rectifier bridge B, a protection relay KM, a voltage-stabilizing chip U1, a key switch S, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a triode Q1, a triode Q2, a triode Q3, a normally open contact J-1 of the main control relay J, a normally closed contact KM-1 of the protection relay KM, an upper probe A1 and a lower probe A2, wherein the transformer T comprises a primary coil g1, a secondary coil g2 and a secondary coil g 3;

the primary coil g1 is connected with a mains supply, one end of the secondary coil g2 is connected with one pin of the rectifier bridge B, and the other end of the secondary coil g2 is connected with the three pins of the rectifier bridge B; one end of the secondary coil g3 is connected with the other end of the secondary coil g3 after being sequentially connected with a key switch S, a normally closed contact KM-1 of a protection relay KM, the protection relay KM and a normally open contact J-1 of a main control relay J in series;

two pins of a rectifier bridge B are respectively connected with one end of a resistor R1, one end of a capacitor C1, one end of a capacitor C2, one pin of a voltage stabilizing chip U1, one end of a main control relay J and the cathode of a diode D4, four pins of the rectifier bridge B are respectively connected with the cathode of a diode D1, the other end of a capacitor C1, the other end of a capacitor C2, a lower probe A2, two pins of a voltage stabilizing chip U1, one end of a capacitor C3, the emitter of a triode Q1, one end of a capacitor C4 and the emitter of a triode Q3; the other end of the resistor R1 is connected with the anode of the diode D1; the three pins of the voltage-stabilizing chip U1 are respectively connected with one end of a resistor R2 and one end of a resistor R5, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is respectively connected with the anode of a diode D2 and the cathode of a diode D5, the cathode of the diode D2 is connected with an upper probe A1, and the anode of the diode D5 is connected with one end of a resistor R4;

the base electrode of the triode Q1 is respectively connected with the other end of the resistor R4 and the other end of the capacitor C3, and the collector electrode of the triode Q1 is respectively connected with the other end of the resistor R5 and the anode of the diode D3; the base electrode of the triode Q2 is respectively connected with the cathode of the diode D3 and the other end of the capacitor C4, the collector electrode of the triode Q2 is respectively connected with the other end of the main control relay J, the anode of the diode D4 and the collector electrode of the diode Q3, and the emitter electrode of the triode Q2 is connected with the base electrode of the triode Q3.

3. The intrinsically safe electrode coal pile protection device of claim 1, wherein the operating voltage between the upper and lower probes is 12V and the short circuit current is 20 MA.

4. The intrinsically safe electrode coal pile protection device of claim 1, wherein the lower probe is directly grounded.

5. The intrinsically safe electrode type coal piling protection device of claim 2, wherein the voltage stabilizing chip U1 is an LM7812 voltage stabilizing chip.

6. The intrinsically safe electrode coal piling protection device of claim 2, wherein the control circuit further comprises a normally closed contact J-2 of a main relay J, the normally closed contact J-2 of the main relay J is arranged on a power supply circuit of the belt conveyor, and after the main relay J is switched on, the normally closed contact J-2 of the main relay J is switched off, and the belt conveyor is switched off.

7. The intrinsically safe electrode coal pile protection device of claim 1, wherein an explosion-proof shield is provided outside the device body.

Technical Field

The invention relates to the technical field of coal mine safety, in particular to an intrinsic safety type electrode type coal piling protection device.

Background

The band conveyer that the colliery used usually sets the coal piling protection device, when the high time surpassed safe height is piled up to the raw coal of conveyer unloading point, the coal piling protection device can in time send out the police dispatch newspaper to coal flow conveying system to make coal flow conveying system stop band conveyer's operation, avoid the emergence of overflowing the storehouse accident, thereby extension band conveyer's life.

The existing coal piling prevention protection structure is coal piling sensor type coal piling prevention protection, and in actual use, the coal piling sensor type coal piling prevention protection frequently has faults of error protection or no protection. The concrete points are as follows: on one hand, the probe is easy to collide with falling coal blocks or be sprayed with water, so that the coal blocks, the probe and the shell or the water, the probe and the shell form a conductive loop under the condition that no coal piling occurs, and the coal piling sensor type coal piling protection error sends out a protection signal to further influence production; on the other hand, the probe is in poor contact with coal or is not in contact with the coal but is positioned in a gap of a coal pile, or the probe is in contact with gangue without electric conduction property, or the shell is grounded due to being in a coal dust or damp environment, so that the coal piling sensor type coal piling prevention protection cannot send out a protection signal when coal piling occurs, and finally a bin overflow accident occurs.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an intrinsically safe electrode coal pile protection device, which can solve the problem that the probe of the coal pile protection sensor cannot operate or operate in place, so that the normal protection function cannot be achieved in the prior art.

In order to achieve the purpose, the invention is realized by the following technical scheme: an intrinsically safe electrode type coal piling protection device comprises: the device comprises a device body, wherein the device body is suspended right above a coal piling point at a preset height, an upper probe and a lower probe are connected to the device body, the upper probe is suspended right below the device body, the bottom height of the upper probe is the same as the preset coal piling safety height, the lower probe is fixedly arranged on a chute, and a contact of the lower probe is connected with an iron shell of the chute; the device is characterized in that a control circuit is arranged in the device body, a main control relay used for controlling the switch of the belt conveyor is arranged in the control circuit, and the upper probe and the lower probe are electrically connected through the control circuit.

Further, the control circuit includes: the device comprises a main control relay J, a transformer T, a rectifier bridge B, a protection relay KM, a voltage-stabilizing chip U1, a key switch S, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a triode Q1, a triode Q2, a triode Q3, a normally open contact J-1 of the main control relay J, a normally closed contact KM-1 of the protection relay KM, an upper probe A1 and a lower probe A2, wherein the transformer T comprises a primary coil g1, a secondary coil g2 and a secondary coil g 3;

the primary coil g1 is connected with a mains supply, one end of the secondary coil g2 is connected with one pin of the rectifier bridge B, and the other end of the secondary coil g2 is connected with the three pins of the rectifier bridge B; one end of the secondary coil g3 is connected with the other end of the secondary coil g3 after being sequentially connected with a key switch S, a normally closed contact KM-1 of a protection relay KM, the protection relay KM and a normally open contact J-1 of a main control relay J in series;

two pins of a rectifier bridge B are respectively connected with one end of a resistor R1, one end of a capacitor C1, one end of a capacitor C2, one pin of a voltage stabilizing chip U1, one end of a main control relay J and the cathode of a diode D4, four pins of the rectifier bridge B are respectively connected with the cathode of a diode D1, the other end of a capacitor C1, the other end of a capacitor C2, a lower probe A2, two pins of a voltage stabilizing chip U1, one end of a capacitor C3, the emitter of a triode Q1, one end of a capacitor C4 and the emitter of a triode Q3; the other end of the resistor R1 is connected with the anode of the diode D1; the three pins of the voltage-stabilizing chip U1 are respectively connected with one end of a resistor R2 and one end of a resistor R5, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is respectively connected with the anode of a diode D2 and the cathode of a diode D5, the cathode of the diode D2 is connected with an upper probe A1, and the anode of the diode D5 is connected with one end of a resistor R4;

the base electrode of the triode Q1 is respectively connected with the other end of the resistor R4 and the other end of the capacitor C3, and the collector electrode of the triode Q1 is respectively connected with the other end of the resistor R5 and the anode of the diode D3; the base electrode of the triode Q2 is respectively connected with the cathode of the diode D3 and the other end of the capacitor C4, the collector electrode of the triode Q2 is respectively connected with the other end of the main control relay J, the anode of the diode D4 and the collector electrode of the diode Q3, and the emitter electrode of the triode Q2 is connected with the base electrode of the triode Q3.

Further, the working voltage between the upper probe and the lower probe is 12V, and the short-circuit current is 20 MA.

Further, the lower probe is directly grounded.

Further, the voltage stabilizing chip U1 adopts an LM7812 voltage stabilizing chip.

Further, the control circuit further comprises a normally closed contact J-2 of a main relay J, the normally closed contact J-2 of the main relay J is arranged on a power supply circuit of the belt conveyor, after the main relay J is switched on, the normally closed contact J-2 of the main relay J is switched off, and the belt conveyor is switched off.

Further, an explosion-proof shield is arranged outside the device body.

Compared with the prior art, the invention has the beneficial effects that: the invention provides an intrinsic safety type electrode coal piling protection device, which adopts a direct current 12V voltage control circuit, an upper probe and a lower probe are extended, the voltage is 12V, and a short-circuit current 20MA belongs to an intrinsic safety device. The upper probe is suspended at the highest position of the coal, the upper probe does not touch the ground and the shell, and the lower probe is connected to the iron shell outside the chute or directly grounded. The structure is simpler, and the performance is more reliable.

After the invention is applied, the coal piling times of the belt head, the transfer point and the coal bunker are obviously reduced, the belt equipment abrasion is reduced, the accidents of belt deviation and the like caused by coal piling are reduced, the labor intensity of workers is reduced, the service time of the equipment belt is prolonged, and the invention has obvious economic benefit and social benefit.

Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a control circuit structure of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.

This embodiment provides an intrinsic safety type electrode coal piling protection device, includes: the coal piling device comprises a device body, wherein the device body is hung right above a coal piling point at a preset height, an upper probe and a lower probe are connected to the device body, the upper probe is arranged right below the device body in a hanging mode, the height of the bottom of the upper probe is the same as the preset coal piling safety height, and the lower probe is directly grounded; the lower probe can also be fixedly arranged on the chute, and the contact of the lower probe is connected with the iron shell of the chute. The device is characterized in that a control circuit is arranged in the device body, a main control relay used for controlling the switch of the belt conveyor is arranged in the control circuit, and the upper probe and the lower probe are electrically connected through the control circuit. An explosion-proof shield is arranged outside the device body.

As shown in fig. 1, the control circuit includes: the device comprises a main control relay J, a transformer T, a rectifier bridge B, a protection relay KM, a voltage-stabilizing chip U1, a key switch S, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a triode Q1, a triode Q2, a triode Q3, a normally open contact J-1 of the main control relay J, a normally closed contact KM-1 of the protection relay KM, an upper probe A1 and a lower probe A2, wherein the transformer T comprises a primary coil g1, a secondary coil g2 and a secondary coil g 3.

The primary coil g1 is connected with a mains supply, one end of the secondary coil g2 is connected with one pin of the rectifier bridge B, and the other end of the secondary coil g2 is connected with the three pins of the rectifier bridge B; one end of the secondary coil g3 is connected with the other end of the secondary coil g3 after being sequentially connected with the key switch S, the normally closed contact KM-1 of the protection relay KM, the protection relay KM and the normally open contact J-1 of the main control relay J in series.

Two pins of a rectifier bridge B are respectively connected with one end of a resistor R1, one end of a capacitor C1, one end of a capacitor C2, one pin of a voltage stabilizing chip U1, one end of a main control relay J and the cathode of a diode D4, four pins of the rectifier bridge B are respectively connected with the cathode of a diode D1, the other end of a capacitor C1, the other end of a capacitor C2, a lower probe A2, two pins of a voltage stabilizing chip U1, one end of a capacitor C3, the emitter of a triode Q1, one end of a capacitor C4 and the emitter of a triode Q3; the other end of the resistor R1 is connected with the anode of the diode D1; the three pins of the voltage stabilizing chip U1 are respectively connected with one end of a resistor R2 and one end of a resistor R5, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is respectively connected with the anode of a diode D2 and the cathode of a diode D5, the cathode of the diode D2 is connected with the upper probe A1, and the anode of the diode D5 is connected with one end of a resistor R4.

The base electrode of the triode Q1 is respectively connected with the other end of the resistor R4 and the other end of the capacitor C3, and the collector electrode of the triode Q1 is respectively connected with the other end of the resistor R5 and the anode of the diode D3; the base electrode of the triode Q2 is respectively connected with the cathode of the diode D3 and the other end of the capacitor C4, the collector electrode of the triode Q2 is respectively connected with the other end of the main control relay J, the anode of the diode D4 and the collector electrode of the diode Q3, and the emitter electrode of the triode Q2 is connected with the base electrode of the triode Q3.

The working voltage between the upper probe and the lower probe is 12V, and the short-circuit current is 20 MA. The voltage stabilizing chip U1 adopts an LM7812 voltage stabilizing chip.

In addition, the control circuit further comprises a normally closed contact J-2 of the main relay J, the normally closed contact J-2 of the main relay J is arranged on a power supply circuit of the belt conveyor, and when the control circuit is used, along with the rise of the coal piling height, gangue touches the upper probe A1 to enable the main relay J to be conducted, the normally closed contact J-2 of the main relay J is disconnected, and the belt conveyor is closed.

The invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.