Broken pin protection device of belt conveyor

Abstract

According to the broken pin protection device for the belt conveyor, a belt motor power source, a to-be-detected object, a switch detection unit and a belt motor are arranged, the to-be-detected object is fixedly installed on the belt conveyor and is detected by the switch detection unit every preset time interval along with operation of the belt conveyor, and the to-be-detected object is detected by the switch detection unit every other preset time interval; when the switch detection unit does not detect the to-be-detected object for a preset time period, the switch detection unit is switched off; the belt motor power supply is electrically connected with the belt motor through the switch detection unit. According to the embodiment of the invention, the on-off of the switch detection unit and the on-off of the circuit between the belt motor power supply and the belt motor are controlled according to whether the switch detection unit detects the object to be detected at the preset time interval, so that the automatic control of the operation of the belt motor is realized; therefore, when the belt motor runs normally and the belt conveyor stops running due to breakage of the coupling pin, the power supply of the belt motor can be cut off in time, coal is stopped from being placed on the belt, and the coal piling phenomenon is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of belt conveyors, and in particular to a pin breakage protection device for belt conveyors. Background Art

[0002] Coal washing plants transport coal through belt conveyors, so it is necessary to ensure the stable and safe operation of belt conveyors. At present, the protection of belt conveyors includes: tear protection, belt break protection, deviation protection, coal pile protection, tension protection, etc. The protection measures are relatively complete, but there are also shortcomings. That is, most of the current belt conveyors are not equipped with pin break protection.

[0003] Among them, the wheel pin is connected between the belt motor and the reducer. The belt motor drives the belt to operate through the wheel pin. When the belt conveyor is operating normally driven by the belt motor, if the wheel pin suddenly breaks, the belt on the belt conveyor will stop, while the belt motor is still in operation. At this time, since the belt stops because of the broken wheel pin, not because the belt motor stops running, coal will still be transported to the belt. If the belt stops because of the broken wheel pin, it will cause coal to pile up on the belt, which will not only seriously affect the normal production order of the coal washing plant and reduce production efficiency, but also may damage the belt conveyor and increase maintenance costs. What is more serious is that the coal pile phenomenon may also cause a series of safety hazards and pose a threat to the personal safety of the staff.

[0004] Therefore, it is necessary to promptly discover that the belt has stopped rotating due to the breakage of the wheel pins. However, in the prior art, the centralized operation control system of the coal washing plant generally detects the operating status of the belt through the operating status of the belt motor. Therefore, when the belt stops rotating due to the breakage of the wheel pins, it is difficult to timely monitor the actual operating status of the belt conveyor through the operating status of the belt motor, and thus it is difficult to promptly stop transporting coal to the belt, resulting in coal piling. Utility Model Content

[0005] An embodiment of the present application provides a belt conveyor pin breakage protection device to solve the technical problems mentioned in the background technology.

[0006] The embodiment of the present application provides a belt conveyor pin breakage protection device, which is applied to the belt conveyor, and includes: a belt motor power supply, an object to be detected, a switch detection unit, and a belt motor;

[0007] The object to be detected is fixedly mounted on the belt conveyor, and is detected by the switch detection unit at intervals of a preset time as the belt conveyor runs. When the switch detection unit fails to detect the object to be detected for more than the preset time, the switch detection unit is disconnected;

[0008] The belt motor power supply is electrically connected to the belt motor through the switch detection unit.

[0009] Optionally, the switch detection unit includes: a photoelectric switch;

[0010] The photoelectric switch is electrically connected between the belt motor power supply and the belt motor.

[0011] Optionally, the switch detection unit further includes: a time relay;

[0012] The coil of the time relay is electrically connected to the photoelectric switch, and the delay contact of the time relay is electrically connected between the belt motor power supply and the belt motor, wherein the delay contact of the time relay is a normally closed contact.

[0013] Optionally, the switch detection unit further includes: an intermediate relay;

[0014] The coil of the intermediate relay is electrically connected to the photoelectric switch, and the normally open contact of the intermediate relay is electrically connected between the belt motor power supply and the coil of the time relay.

[0015] Optionally, the switch detection unit further includes: a contactor;

[0016] The coil of the contactor is electrically connected between the belt motor power supply and the delay contact of the time relay, and the auxiliary normally open contact of the contactor is electrically connected between the belt motor power supply and the belt motor.

[0017] Optionally, it also includes: a manual start switch and a manual stop switch;

[0018] The manual start switch is electrically connected between the manual stop switch and the coil of the contactor, the manual stop switch is electrically connected to the belt motor power supply, one end of the auxiliary normally open contact of the contactor is electrically connected between the manual start switch and the manual stop switch, and the other end of the auxiliary normally open contact of the contactor is electrically connected between the manual start switch and the coil of the contactor.

[0019] Optionally, the object to be detected is an iron sheet installed on the tail roller of the belt conveyor.

[0020] The embodiment of the present application provides a belt conveyor pin break protection device, which is provided with a belt motor power supply, an object to be detected, a switch detection unit, and a belt motor, wherein the object to be detected is fixedly installed on the belt conveyor, and is detected by the switch detection unit at each preset time interval as the belt conveyor runs. When the switch detection unit fails to detect the object to be detected after exceeding the preset time, the switch detection unit is disconnected; the belt motor power supply is electrically connected to the belt motor through the switch detection unit. This embodiment utilizes the rotation of the belt conveyor, fixes the object to be detected on the belt conveyor, and makes it rotate periodically with the belt conveyor. By controlling whether the switch detection unit detects the object to be detected at each preset time interval, the switch detection unit is turned on and off, and the circuit between the belt motor power supply and the belt motor is turned on and off, thereby realizing automatic control of the operation of the belt motor. Therefore, when the belt motor is running normally and the belt conveyor stops running due to the breakage of the wheel pin, the power supply of the belt motor can be cut off in time, thereby stopping the placement of coal on the belt, and avoiding the coal pile phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A diagram showing an application scenario of a pin breakage protection device for a belt conveyor provided in one embodiment of the present application;

[0023] Figure 2 A circuit diagram of a pin breakage protection device for a belt conveyor provided in one embodiment of the present application;

[0024] Figure 3 A circuit diagram of a belt conveyor pin breakage protection device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Figure 1 This is an application scenario diagram of the belt conveyor pin breakage protection device provided in one embodiment of the present application. Figure 1As shown, the belt conveyor pin breakage protection device comprises: a belt motor power supply 100, a switch detection unit 200, a belt motor 300 and an object to be detected 400;

[0027] The object to be detected 400 is fixedly installed on the belt conveyor and is detected by the switch detection unit 200 at each preset time interval of the belt conveyor. When the switch detection unit 200 fails to detect the object to be detected 400 for more than the preset time, the switch detection unit 200 is disconnected;

[0028] The belt motor power supply 100 is electrically connected to the belt motor 300 through the switch detection unit 200 .

[0029] Specifically, the object to be detected 400 is a component fixedly installed on the belt conveyor, and can rotate periodically with the rotation of the belt on the belt conveyor.

[0030] When the object to be detected 400 rotates with the periodic operation of the belt, the corresponding part of the rotation path is located in the detection range of the switch detection unit 200, while the remaining rotation path is not located in the detection range of the switch detection unit 200. In this way, when the object to be detected 400 rotates periodically with the rotation of the belt on the belt conveyor, the object to be detected 400 periodically appears in the detection range of the switch detection unit 200 and is detected by the switch detection unit 200. In other words, when the belt on the belt conveyor operates normally, the switch detection unit 200 will detect the object to be detected 400 at every preset time interval. When the switch detection unit 200 detects the object to be detected 400 at the preset time interval, the switch detection unit 200 remains in the on state, so that the belt motor 300 keeps running; when the switch detection unit 200 does not detect the object to be detected 400 for more than the preset time, the switch detection unit 200 is disconnected, thereby controlling the belt motor 300 to stop running.

[0031] Among them, for the preset time length, its value is generally set to be relatively small, for example, it can be 5s, so that when the wheel pin breaks, the switch detection unit 200 can be disconnected in time, and the belt motor 300 can be stopped in time. Therefore, it is necessary to reasonably set the installation position of the object to be detected 400. In this embodiment, the object to be detected 400 can be an iron sheet set on the tail roller 500 of the belt conveyor.

[0032] In addition, multiple objects to be detected 400 may be evenly distributed, for example, multiple objects to be detected 400 may be arranged at the edge of a belt, so that as the belt rotates, multiple objects to be detected 400 appear in the detection range of the switch detection unit 200 in sequence.

[0033] During specific use, first install the iron sheet, check the belt motor power supply 100, the switch detection unit 200, and the belt motor 300 to ensure that the belt motor power supply 100, the iron sheet, the switch detection unit 200, and the belt motor 300 can work normally.

[0034] Then, the belt motor 300 is started, and the belt motor 300 drives the belt conveyor to rotate. When the belt conveyor rotates, the tail roller 500 of the belt conveyor periodically performs a circular motion, thereby causing the iron sheet to periodically perform a circular motion.

[0035] When the belt of the belt conveyor is operating normally, the iron sheet will rotate to the detection range of the switch detection unit 200 at preset time intervals and be detected by the switch detection unit 200. At this time, the switch detection unit 200 remains in the on state, so that the circuit between the belt motor power supply 100 and the belt motor 300 remains on, and the belt motor 300 operates normally. At this time, coal is placed on the belt normally.

[0036] The belt motor 300 maintains normal operation, while the belt of the belt conveyor operates abnormally, for example, it stops rotating due to the breakage of the wheel pin, so that when the time from the last time the switch detection unit 200 detected the iron sheet is greater than or equal to the preset time, the iron sheet does not appear within the detection range of the switch detection unit 200, and the switch detection unit 200 is disconnected, so that the circuit between the belt motor power supply 100 and the belt motor 300 is disconnected, and the belt motor 300 stops running. At this time, stop placing coal on the belt to avoid coal piling.

[0037] In this embodiment, a belt motor power supply 100, an object to be detected 400, a switch detection unit 200, and a belt motor 300 are set, wherein the object to be detected 400 is fixedly installed on the belt conveyor, and is detected by the switch detection unit 200 at each preset time interval as the belt conveyor runs. When the switch detection unit 200 fails to detect the object to be detected 400 for more than the preset time, the switch detection unit 200 is disconnected; the belt motor power supply 100 is electrically connected to the belt motor 300 through the switch detection unit 200. This embodiment utilizes the rotation of the belt conveyor to fix the object 400 to be detected on the belt conveyor and makes it rotate periodically with the belt conveyor. The switch detection unit 200 controls the on and off of the switch detection unit 200 and the on and off of the circuit between the belt motor power supply 100 and the belt motor 300 by detecting whether the object 400 to be detected is detected at each preset time interval, thereby realizing automatic control of the operation of the belt motor 300. Therefore, when the belt motor 300 is running normally and the belt conveyor stops running due to the breakage of the wheel pin, the power supply of the belt motor 300 can be cut off in time, thereby stopping the placement of coal on the belt and avoiding the coal piling phenomenon.

[0038] Optional, such as Figure 2 As shown, the switch detection unit 200 includes: a photoelectric switch PNP;

[0039] The photoelectric switch PNP is electrically connected between the belt motor power supply 100 and the belt motor 300 .

[0040] Specifically, for the partial rotation path corresponding to the object to be detected 400, when the object to be detected 400 is located on the partial rotation path, the photoelectric switch PNP can detect the object to be detected 400, and when the object to be detected 400 is located on the remaining path of its rotation path, it cannot be detected by the photoelectric switch PNP.

[0041] in, Figure 2 In the circuit diagram, BF is a fuse used to cut off the circuit in time when a fault occurs in the circuit.

[0042] When the object to be detected 400 rotates to the photoelectric switch PNP, the light emitted by the transmitting end of the photoelectric switch PNP is blocked by the object to be detected 400, so that the intensity of the light received by the receiving end of the photoelectric switch PNP is weakened. At this time, it means that the photoelectric switch PNP detects the object to be detected 400 and outputs an electrical signal, thereby connecting the circuit between the belt motor power supply 100 and the belt motor 300; when the photoelectric switch PNP does not detect the object to be detected 400 within a preset time, the photoelectric switch PNP stops transmitting the electrical signal, thereby disconnecting the circuit between the belt motor power supply 100 and the belt motor 300.

[0043] The use principle and method of the photoelectric switch PNP can refer to the prior art and will not be described in detail here. For example, the photoelectric switch PNP is connected to the controller. When the photoelectric switch PNP detects the object to be detected 400, an electrical signal is transmitted to the controller. After receiving the electrical signal, the controller controls the circuit between the belt motor power supply 100 and the belt motor 300 to be turned on.

[0044] Optional, such as Figure 2 As shown, the switch detection unit 200 further includes: a time relay;

[0045] The coil KT-S of the time relay is electrically connected to the photoelectric switch PNP, and the delay contact KT-Y of the time relay is electrically connected between the belt motor power supply 100 and the belt motor 300, wherein the delay contact KT-Y of the time relay is a normally closed contact.

[0046] Specifically, the photoelectric switch PNP detects the object to be detected 400 and outputs an electrical signal. Since the coil KT-S of the time relay is connected to the photoelectric switch PNP, the coil of the time relay is energized, so that the time relay delay contact KT-Y is in a normally closed state. At this time, the circuit between the belt motor power supply 100 and the belt motor 300 is in a conducting state. When the photoelectric switch PNP does not detect the object to be detected 400 within the preset time, the photoelectric switch PNP stops transmitting electrical signals to the coil KT-S of the time relay, and the coil KT-S of the time relay loses power. Then, the delay contact KT-Y of the time relay is disconnected when the delay time of the time relay is reached, thereby cutting off the circuit between the belt motor power supply 100 and the belt motor 300, stopping the belt motor from running, and stopping the placement of coal on the belt to avoid coal piling.

[0047] Optional, such as Figure 2 As shown, the switch detection unit 200 further includes: an intermediate relay;

[0048] The coil KA-S of the intermediate relay is electrically connected to the photoelectric switch PNP, and the normally open contact KA-K of the intermediate relay is electrically connected between the belt motor power supply 100 and the coil KT-S of the time relay.

[0049] Specifically, the photoelectric switch PNP detects the object to be detected 400 and outputs an electrical signal. Since the coil KA-S of the intermediate relay is connected to the photoelectric switch PNP, the coil KA-S of the intermediate relay is energized, so that the normally open contact KA-K of the intermediate relay is closed, so that the coil KT-S of the time relay is energized, so that the time relay delay contact KT-Y is in a normally closed state, and at this time, the circuit between the belt motor power supply 100 and the belt motor 300 is in a conducting state. When the photoelectric switch PNP does not detect the object to be detected 400 within the preset time length, the photoelectric switch PNP stops transmitting the electrical signal to the coil KA-S of the intermediate relay, and the coil KA-S of the intermediate relay loses power, so that the normally open contact KA-K of the intermediate relay is disconnected, so that the coil KT-S of the time relay loses power, and the time relay delay contact KT-Y is disconnected when the delay time length of the time relay is reached, thereby cutting off the circuit between the belt motor power supply 100 and the belt motor 300, and stopping the belt motor 300. Since the intermediate relay has good stability, the present application can improve the accuracy of control by controlling the power on and off of the time relay coil through the intermediate relay, thereby accurately controlling the power on and off of the time relay coil. When the pin of the wheel breaks and the belt stops, the belt motor 300 is stopped in time, thereby stopping the placement of coal on the belt and avoiding coal piling.

[0050] Optional, such as Figure 2As shown, the switch detection unit 200 further includes: a contactor;

[0051] The coil KM-S of the contactor is electrically connected between the belt motor power supply 100 and the delay contact KT-Y of the time relay, and the auxiliary normally open contact KM-F of the contactor is electrically connected between the belt motor power supply 100 and the belt motor 300.

[0052] Specifically, when the photoelectric switch PNP detects the object to be detected 400, the coil KA-S of the intermediate relay is energized, so that the coil KT-S of the time relay is energized, and the time relay KT delay contact KT-Y is in a normally closed state. Since the coil KM-S of the contactor is connected between the belt motor power supply 100 and the delay contact KT-Y of the time relay, the time relay delay contact KT-Y is closed, so that the coil KM-S of the contactor is energized, thereby closing the auxiliary normally open contact KM-F of the contactor. At this time, the circuit between the belt motor power supply 100 and the belt motor 300 is in a conducting state.

[0053] When the photoelectric switch PNP does not detect the object to be detected 400 within the preset time, the photoelectric switch PNP stops transmitting the electrical signal to the coil KA-S of the intermediate relay, and the coil KA-S of the intermediate relay loses power, causing the normally open contact KA-K of the intermediate relay to disconnect, thereby causing the coil KT-S of the time relay to lose power, causing the time relay delay contact KT-Y to disconnect when the delay time of the time relay is reached, thereby causing the coil KM-S of the contactor to lose power, causing the auxiliary normally open contact KM-F of the contactor to disconnect, thereby cutting off the circuit between the belt motor power supply 100 and the belt motor 300, causing the belt motor 300 to stop running, thereby stopping the placement of coal on the belt, and avoiding the coal pile phenomenon. Since the contactor has reliable opening and closing contacts, the present application controls the start and stop of the belt motor 300 through the contactor, which can improve the reliability of the start and stop of the belt motor 300.

[0054] Optional, such as Figure 3 As shown, the belt conveyor pin break protection device also includes: a manual start switch S1 and a manual stop switch S2;

[0055] The manual start switch S1 is electrically connected between the manual stop switch S2 and the coil KM-S of the contactor, the manual stop switch S2 is electrically connected to the belt motor power supply 100, one end of the auxiliary normally open contact KM-F of the contactor is electrically connected between the manual start switch S1 and the manual stop switch S2, and the other end of the auxiliary normally open contact KM-F of the contactor is electrically connected between the manual start switch S1 and the coil KM-S of the contactor.

[0056] Specifically, the manual start switch S1 is in a normally open state, and the manual stop switch S2 is in a normally closed state.

[0057] When it is necessary to manually start the belt motor 300, press the manual start switch S1. Since the manual start switch S1 is connected between the manual stop switch S2 and the coil KM-S of the contactor, and the manual stop switch S2 is in the normally closed state, the manual stop switch S2 is connected to the belt motor power supply 100. Therefore, the coil KM-S of the contactor is energized, thereby closing the auxiliary normally open contact KM-F of the contactor. At this time, the circuit between the belt motor power supply 100 and the belt motor 300 is in the on state.

[0058] When it is necessary to manually shut down the belt motor 300, press the manual stop switch S2 to switch the manual stop switch S2 to the off state, thereby de-energizing the coil KM-S of the contactor, disconnecting the auxiliary normally open contact KM-F of the contactor, thereby cutting off the circuit between the belt motor power supply 100 and the belt motor 300, stopping the belt motor 300 from running, and stopping the placement of coal on the belt to avoid coal piling.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A belt conveyor pin breakage protection device, characterized in that: Applied to the belt conveyor, comprising: a belt motor power supply, an object to be detected, a switch detection unit, and a belt motor; The object to be detected is fixedly mounted on the belt conveyor, and is detected by the switch detection unit at intervals of a preset time as the belt conveyor runs. When the switch detection unit fails to detect the object to be detected for more than the preset time, the switch detection unit is disconnected; The belt motor power supply is electrically connected to the belt motor through the switch detection unit.

2. The pin breakage protection device for a belt conveyor according to claim 1, characterized in that: The switch detection unit comprises: a photoelectric switch; The photoelectric switch is electrically connected between the belt motor power supply and the belt motor.

3. The pin breakage protection device for a belt conveyor according to claim 2, characterized in that: The switch detection unit also includes: a time relay; The coil of the time relay is electrically connected to the photoelectric switch, and the delay contact of the time relay is electrically connected between the belt motor power supply and the belt motor, wherein the delay contact of the time relay is a normally closed contact.

4. The pin breakage protection device for a belt conveyor according to claim 3, characterized in that: The switch detection unit further includes: an intermediate relay; The coil of the intermediate relay is electrically connected to the photoelectric switch, and the normally open contact of the intermediate relay is electrically connected between the belt motor power supply and the coil of the time relay.

5. The pin breakage protection device for a belt conveyor according to claim 3, characterized in that: The switch detection unit further includes: a contactor; The coil of the contactor is electrically connected between the belt motor power supply and the delay contact of the time relay, and the auxiliary normally open contact of the contactor is electrically connected between the belt motor power supply and the belt motor.

6. The pin breakage protection device for a belt conveyor according to claim 5, characterized in that: Also includes: Manual start switch and manual stop switch; The manual start switch is electrically connected between the manual stop switch and the coil of the contactor, the manual stop switch is electrically connected to the belt motor power supply, one end of the auxiliary normally open contact of the contactor is electrically connected between the manual start switch and the manual stop switch, and the other end of the auxiliary normally open contact of the contactor is electrically connected between the manual start switch and the coil of the contactor.

7. The pin breakage protection device for a belt conveyor according to any one of claims 1 to 6, characterized in that: The object to be detected is an iron sheet installed on the tail roller of the belt conveyor.

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