Fault detection device for scraper conveyor chain

Abstract

The utility model discloses a fault detection device for a scraper conveyor chain, and relates to the field of fault detection, a chain breaking monitoring circuit is arranged above a scraper of the scraper conveyor chain, the chain breaking condition of the scraper conveyor chain is monitored through the chain breaking monitoring circuit, when the chain breaking monitoring circuit detects that the conveyor chain is broken, a first controllable switch is switched on, and a second controllable switch is switched off; when the scraper conveyor chain breaks down, the first controllable switch is switched on to enable the alarm module connected with the first controllable switch in series to be powered on to give a corresponding alarm, and meanwhile, the chain breakage monitoring circuit controls the second controllable switch to be switched off to enable the scraper controller to be powered off so as to enable the whole scraper conveyor chain to stop working. And when the scraper conveying chain breaks down, the scraper conveying chain can be controlled to stop working in time, manual participation is not needed in the whole process, and the safety of the scheme is improved.

Description

Technical Field

[0001] The utility model relates to the field of fault detection, in particular to a fault detection device for a scraper conveyor chain. Background Art

[0002] The scraper conveyor chain is the main device for conveying materials in the scraper conveyor during coal storage and transportation. It drives the scraper to move and transports the coal forward. During long-term operation, the scraper conveyor chain will gradually stretch and deform. If it is not inspected and discovered in time, once a chain break occurs, it will cause the conveyor chains on both sides of the scraper conveyor to tilt, leading to major mechanical equipment failures. The traditional fault inspection method relies on manually opening the observation port of the scraper conveyor chain and regularly checking the operating status of the scraper conveyor chain. There are problems such as untimely fault detection and high labor intensity. In addition, during the observation process, if coal splashes or the scraper conveyor chain is blocked, it is easy to cause safety hazards such as accidental injury to personnel. Utility Model Content

[0003] The purpose of the utility model is to provide a fault detection device for a scraper conveyor chain. This solution can not only timely discover the fault situation of the scraper conveyor chain and issue a corresponding alarm, but also timely control the scraper conveyor chain to stop working when the scraper conveyor chain fails. The whole process does not require human participation, which improves the safety of the solution.

[0004] In order to solve the above technical problems, the utility model provides a fault detection device for a scraper conveyor chain, comprising:

[0005] A chain break monitoring circuit is arranged at a preset position above the scraper, contacts the scraper when it moves below the preset position, and has an output end connected to a control end of a first controllable switch and a control end of a second controllable switch, and is used to control the first controllable switch to be closed and the second controllable switch to be disconnected when the conveying chain of the scraper is disconnected;

[0006] Alarm module;

[0007] The first controllable switch is connected in series with the alarm module and the series circuit is connected to a DC power supply;

[0008] The second controllable switch is connected in series with the scraper controller, and the series circuit is connected to the DC power supply.

[0009] Optionally, the link break monitoring circuit includes:

[0010] A first travel switch is arranged at a first preset position above the scraper, a first end of a first travel switch normally open contact of the first travel switch is connected to a live wire of an AC power source, and a first end of a first travel switch normally closed contact is connected to a live wire of the AC power source, and is used for closing the first travel switch normally open contact and disconnecting the first travel switch normally closed contact when the contact head of the first travel switch contacts the scraper;

[0011] A second travel switch is arranged at a second preset position above the scraper, wherein a first end of a second travel switch normally closed contact of the second travel switch is connected to a second end of a normally open contact of the first travel switch, a first end of a second travel switch normally open contact of the second travel switch is connected to a second end of a normally closed contact of the first travel switch, a second end of a second travel switch normally open contact of the second travel switch and a second end of a second travel switch normally closed contact of the second travel switch are both connected to a control end of the first controllable switch and a control end of the second controllable switch, so that when a contact head of the second travel switch contacts the scraper, the normally open contact of the second travel switch is closed, the normally closed contact of the second travel switch is disconnected, and the first preset position is a preset distance away from the second preset position;

[0012] Wherein, when the scraper operates normally to the preset position, the contact head of the first travel switch and the contact head of the second travel switch contact the scraper at the same time.

[0013] Optionally, the first controllable switch includes:

[0014] A first coil, wherein a first end of the first coil is connected to a second end of a normally open contact of the second travel switch and a second end of a normally closed contact of the second travel switch, and a second end of the first coil is connected to a neutral line of the AC power supply, for obtaining power when the transmission chain is disconnected;

[0015] A first controllable switch normally open contact is connected in series with the alarm module and the series circuit is connected to the DC power supply, and is used for closing when the first coil is energized to energize the alarm module.

[0016] Optionally, the second controllable switch includes:

[0017] a second coil, wherein a first end of the second coil is connected to a second end of a normally open contact of the second travel switch and a second end of a normally closed contact of the second travel switch, and a second end is connected to a neutral line of the AC power supply, and is used to be powered when the transmission chain is disconnected, and the first coil and the second coil are the same coil;

[0018] The second controllable switch normally closed contact is connected in series with the scraper controller and the series circuit is connected to the DC power supply, and is used for disconnecting when the second coil is energized to make the scraper controller lose power.

[0019] Optionally, the alarm module is a display alarm module and / or a sound alarm module, which is connected in series with the first controllable switch and the series circuit is connected to the DC power supply, for performing a corresponding display alarm and / or sound alarm when the first controllable switch is closed.

[0020] Optionally, also include:

[0021] The DC power supply.

[0022] Optionally, the DC power supply includes:

[0023] A rectifier module, the input end of which is connected to the AC power source, and the output end of which is connected to the input end of the transformer module, for converting the AC power transmitted by the AC power source into corresponding DC power;

[0024] The transformer module, the output end of which is connected to the circuit of the first controllable switch and the alarm module in series, is used to convert the voltage of the DC power into a first working voltage required for the normal operation of the alarm module and a second working voltage required for the normal operation of the scraper controller.

[0025] Optionally, also include:

[0026] A fuse, wherein the input end of the fuse is connected to the live wire of the AC power supply, and the output end is connected to the first end of the normally open contact of the first travel switch and the first end of the normally closed contact of the first travel switch, and is used to disconnect when an overcurrent occurs in the circuit.

[0027] Optionally, also include:

[0028] A fixing bracket arranged parallel to the scraper plate is used to fix the chain break monitoring circuit above the scraper plate.

[0029] Optionally, also include:

[0030] An emergency stop switch, wherein the input end of the emergency stop switch is connected to the output end of the link break monitoring circuit, and the output end is connected to the control end of the first controllable switch and the control end of the second controllable switch, and is used to control the power on and off of the control end of the first controllable switch and the control end of the second controllable switch.

[0031] The utility model provides a fault detection device for a scraper conveyor chain. A chain break monitoring circuit is arranged above the scraper of the scraper conveyor chain, and the chain break situation of the scraper conveyor chain is monitored by the chain break monitoring circuit. When the chain break monitoring circuit detects that the conveyor chain is disconnected, the first controllable switch is closed, so that the alarm module connected in series with the first controllable switch is energized to issue a corresponding alarm. At the same time, the chain break monitoring circuit controls the second controllable switch to be disconnected, so that the scraper controller loses power, so that the entire scraper conveyor chain stops working. This solution can not only timely discover the fault situation of the scraper conveyor chain and issue a corresponding alarm, but also timely control the scraper conveyor chain to stop working when the scraper conveyor chain fails. The whole process does not require human participation, which improves the safety of the solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model 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 in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a fault detection device for a scraper conveyor chain provided by the utility model;

[0034] Figure 2 A schematic diagram of a fault detection device for a scraper conveyor chain provided by the utility model;

[0035] Figure 3 A system diagram of a fault detection device for a scraper conveyor chain provided by the utility model;

[0036] Figure 4 A wiring diagram of a fault detection device for a scraper conveyor chain provided by the utility model;

[0037] Figure 5 The utility model provides an electrical schematic diagram of a fault detection device for a scraper conveyor chain. DETAILED DESCRIPTION

[0038] The core of the utility model is to provide a fault detection device for a scraper conveyor chain. This solution can not only timely discover the fault of the scraper conveyor chain and issue a corresponding alarm, but also timely control the scraper conveyor chain to stop working when the scraper conveyor chain fails. The whole process does not require human participation, which improves the safety of the solution.

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a fault detection device for a scraper conveyor chain provided by the utility model. The device comprises:

[0041] The chain break monitoring circuit 1 is arranged at a preset position above the scraper, contacts the scraper when it moves to below the preset position, and has an output end connected to a control end of a first controllable switch 3 and a control end of a second controllable switch 4, and is used to control the first controllable switch 3 to close and the second controllable switch 4 to open when the conveying chain of the scraper is disconnected;

[0042] Alarm module 2;

[0043] A first controllable switch 3, the first controllable switch 3 is connected in series with the alarm module 2 and the series circuit is connected to a DC power supply;

[0044] The second controllable switch 4 is connected in series with the scraper controller, and the series circuit is connected to a DC power supply.

[0045] In the utility model, the chain break monitoring circuit 1 is arranged at a preset position above the scraper. When the conveying chain of the scraper does not break, the chain break monitoring circuit 1 can contact the scraper running below the preset position. On the contrary, if the conveying chain of the scraper breaks, the chain break monitoring circuit 1 cannot contact the scraper running below the preset position. At this time, the chain break monitoring circuit 1 will control the first controllable switch 3 to close and control the second controllable switch 4 to open. Because the first controllable switch 3, the DC power supply and the alarm module 2 form a complete circuit, when the first controllable switch 3 is closed, the alarm module 2 can be powered and issue a corresponding alarm. Because the second controllable switch 4, the scraper controller and the DC power supply form a complete circuit, when the second controllable switch 4 is disconnected, the scraper controller loses power and controls the scraper conveying chain to stop working. This solution can not only timely detect the fault of the scraper conveying chain and issue a corresponding alarm, but also timely control the scraper conveying chain to stop working when the scraper conveying chain fails. The whole process does not require human participation, which improves the safety of the solution.

[0046] It should be noted that the present application can monitor the running status of the scraper conveyor chain at any time without the need for special personnel supervision. Once the chain is broken, the situation can be understood in time, which is convenient for timely maintenance, which not only ensures that other equipment is not damaged, but also shortens the time of production suspension for maintenance. Moreover, the present application can solve the problems of no special equipment for maintenance, high labor intensity, low maintenance efficiency, and large number of personnel, as well as the potential safety hazards of accidental fall of the scraper chain causing injury and damage to equipment, so as to improve the maintenance efficiency of the scraper machine, reduce labor intensity, optimize the maintenance process, reduce the number of personnel occupied by maintenance, and ensure the safety of the operation. It has the characteristics of low production cost and simple operation, and realizes the on-site handling of temporary failures of the braking system.

[0047] The present embodiment provides a fault detection device for a scraper conveyor chain, in which a chain break monitoring circuit 1 is arranged above the scraper of the scraper conveyor chain, and the chain break monitoring circuit 1 is used to monitor the chain break of the scraper conveyor chain. When the chain break monitoring circuit 1 detects that the conveyor chain is disconnected, the first controllable switch 3 is closed, so that the alarm module 2 connected in series with the first controllable switch 3 is powered and sends out a corresponding alarm. At the same time, the chain break monitoring circuit 1 controls the second controllable switch 4 to be disconnected, so that the scraper controller loses power, so that the entire scraper conveyor chain stops working. This solution can not only detect the fault of the scraper conveyor chain in time and send out a corresponding alarm, but also control the scraper conveyor chain to stop working in time when a fault occurs in the scraper conveyor chain. The whole process does not require human participation, thereby improving the safety of the solution.

[0048] Based on the above embodiments:

[0049] As an optional embodiment, the link break monitoring circuit 1 includes:

[0050] A first travel switch is arranged at a first preset position above the scraper, a first end of a first travel switch normally open contact of the first travel switch is connected to a live wire of the AC power supply, and a first end of a first travel switch normally closed contact is connected to a live wire of the AC power supply, and is used for closing the first travel switch normally open contact and disconnecting the first travel switch normally closed contact when the contact head of the first travel switch contacts the scraper;

[0051] A second travel switch is arranged at a second preset position above the scraper, a first end of a second travel switch normally closed contact of the second travel switch is connected to a second end of a normally open contact of the first travel switch, a first end of a second travel switch normally open contact of the second travel switch is connected to a second end of a normally closed contact of the first travel switch, a second end of a second travel switch normally open contact of the second travel switch and a second end of a second travel switch normally closed contact of the second travel switch are both connected to a control end of the first controllable switch 3 and a control end of the second controllable switch 4, and is used for closing the normally open contact of the second travel switch and disconnecting the normally closed contact of the second travel switch when a contact head of the second travel switch contacts the scraper, and the first preset position is a preset distance away from the second preset position;

[0052] When the scraper normally operates to the preset position, the contact head of the first travel switch and the contact head of the second travel switch contact the scraper at the same time.

[0053] In the utility model, the chain break monitoring circuit 1 includes: a first travel switch arranged at a first preset position above the scraper and a second travel switch arranged at a second preset position above the scraper. When the scraper runs normally to the preset position, the contact head of the first travel switch and the contact head of the second travel switch are in contact with the scraper at the same time, that is, the normally open contact of the first travel switch is closed, the normally closed contact of the first travel switch is disconnected, and the normally open contact of the second travel switch is closed, and the normally closed contact of the second travel switch is disconnected. On the contrary, once a chain break occurs in the conveying chain, for example, a chain break occurs at the first preset position, then the contact head of the first travel switch corresponding to the first preset position cannot contact the scraper. At this time, the contact head of the second travel switch corresponding to the first preset position cannot contact the scraper. The normally open contact of a travel switch is disconnected and the normally closed contact of the first travel switch is opened. Because at this time, the contact of the second travel switch can contact the scraper, the normally open contact of the second travel switch is closed and the normally closed contact of the second travel switch is disconnected, so that the control end of the first controllable switch 3 and the control end of the second controllable switch 4 are energized. Conversely, if a chain break occurs at the second preset position, the closed contacts at this time are the normally closed contacts of the second travel switch and the normally open contacts of the first travel switch, which also energize the control end of the first controllable switch 3 and the control end of the second controllable switch 4. Therefore, when the scraper conveyor chain breaks, the fault alarm can be accurately realized, and the scraper conveyor chain can be controlled to stop working.

[0054] As an optional embodiment, the first controllable switch 3 includes:

[0055] A first coil, a first end of the first coil is connected to a second end of a normally open contact of a second travel switch and a second end of a normally closed contact of the second travel switch, and a second end of the first coil is connected to a neutral line of an AC power source, for obtaining power when the transmission chain is disconnected;

[0056] The first controllable switch normally open contact is connected in series with the alarm module 2 and the series circuit is connected to a DC power supply, and is used for closing when the first coil is energized to energize the alarm module 2.

[0057] In the utility model, the first controllable switch 3 includes a first coil and a first controllable switch normally open contact, wherein the first coil is energized when the transmission chain is disconnected, and the first coil will cause the first controllable switch normally open contact to close after being energized, and the first controllable switch normally open contact and the alarm module 2 and the DC power supply form a complete circuit. Once the first controllable switch normally open contact is closed, the alarm module 2 will be energized to send out an alarm, so the alarm of the broken chain fault can be accurately realized.

[0058] As an optional embodiment, the second controllable switch 4 includes:

[0059] A second coil, wherein a first end of the second coil is connected to a second end of a normally open contact of the second travel switch and a second end of a normally closed contact of the second travel switch, and a second end is connected to a neutral line of an AC power source, and is used to be powered when the transmission chain is disconnected, and the first coil and the second coil are the same coil;

[0060] The second controllable switch normally closed contact is connected in series with the scraper controller, and the series circuit is connected to the DC power supply, and is used to disconnect when the second coil is energized to make the scraper controller lose power.

[0061] In the utility model, the second controllable switch 4 includes a second coil and a normally open contact of the second controllable switch, wherein the second coil is energized when the conveying chain is disconnected, and the second coil will cause the normally closed contact of the second controllable switch to be disconnected after being energized, and the normally closed contact of the second controllable switch forms a complete circuit with the scraper controller and the DC power supply. Once the normally closed contact of the second controllable switch is disconnected, the scraper controller will lose power, thereby stopping the scraper conveying chain. When the conveying chain fails, the scraper conveying chain can be promptly controlled to stop working, thereby improving the safety of the solution.

[0062] It should be noted that, because the first coil and the second coil are the same coil, the first controllable switch 3 and the second controllable switch 4 are equivalent to being replaced by an intermediate relay, wherein the first coil and the second coil are replaced by the coil of the intermediate relay, the normally open contact of the intermediate relay replaces the normally open contact of the first controllable switch, and the normally closed contact of the intermediate relay replaces the normally closed contact of the second controllable switch, thereby saving the number of switches and reducing the volume and cost.

[0063] As an optional embodiment, the alarm module 2 is a display alarm module 2 and / or a sound alarm module 2, the display alarm module 2 and / or the sound alarm module 2 is connected in series with the first controllable switch 3 and the series circuit is connected to a DC power supply, and is used to perform a corresponding display alarm and / or sound alarm when the first controllable switch 3 is closed.

[0064] In the utility model, the alarm module 2 is a display alarm module 2 and / or a sound alarm module 2, that is, the alarm module 2 can be a display alarm module 2, can also be a sound alarm module 2, and can also be a display alarm module 2 and a sound alarm module 2, wherein the display alarm module 2 can be powered when the DC power supply is powered on and the first controllable switch 3 is closed, and a corresponding display alarm is issued. Similarly, the sound alarm module 2 can be powered when the DC power supply is powered on and the first controllable switch 3 is closed, and a corresponding sound alarm is issued, thereby promptly reminding the user of the current fault condition of the scraper conveyor chain, which is convenient for subsequent maintenance of the scraper conveyor chain.

[0065] It should be noted that, in practical applications, the display alarm device may be an LED or other display device, and the sound alarm device may be an alarm or other sound device.

[0066] As an optional embodiment, it also includes:

[0067] DC power supply.

[0068] In the utility model, a DC power supply is also provided in the fault detection device of the scraper conveyor chain, and because the function of the DC power supply is to supply power to the alarm module 2, the voltage output by the DC power supply must be the normal working voltage required for the normal operation of the alarm module 2 and the normal working voltage required for the normal operation of the scraper controller, so that the alarm module 2 and the scraper controller can work normally. In addition, the DC power supply provided in the device is also convenient for carrying and moving.

[0069] It should be noted that, in practical applications, a 24V DC switching power supply is generally selected as the power supply for the warning light.

[0070] As an optional embodiment, the DC power supply includes:

[0071] A rectifier module, the input end of the rectifier module is connected to the AC power supply, and the output end is connected to the input end of the transformer module, and is used to convert the AC power transmitted by the AC power supply into the corresponding DC power;

[0072] The transformer module, the output end of which is respectively connected to the circuit of the first controllable switch 3 and the alarm module 2 in series and the circuit of the second controllable switch 4 and the scraper controller in series, is used to convert the voltage of the DC power into the first working voltage required for the normal operation of the alarm module 2 and the second working voltage required for the normal operation of the scraper controller.

[0073] In the utility model, the DC power supply includes: a rectifier module and a transformer module, wherein the rectifier module is used to convert the AC power transmitted by the AC power supply into the corresponding DC power, and the transformer module is used to convert the voltage of the DC power into the first working voltage required for the normal operation of the alarm module 2 and the second working voltage required for the normal operation of the scraper controller, so that the alarm module 2 and the scraper controller can work normally.

[0074] As an optional embodiment, it also includes:

[0075] A fuse, the input end of the fuse is connected to the live wire of the AC power supply, and the output end is connected to the first end of the normally open contact of the first travel switch and the first end of the normally closed contact of the first travel switch, and is used to disconnect when an overcurrent occurs in the circuit.

[0076] In the utility model, a fuse is further provided between the AC power supply and the first travel switch. Because the fuse is connected in series in the circuit, when a short circuit occurs in the circuit and the current passing through the fuse reaches or exceeds a certain specified value, the heat generated by the fuse melts the fuse, thereby automatically disconnecting the circuit to play a protective role, thereby protecting various circuit elements in the circuit and improving the safety of the solution.

[0077] As an optional embodiment, it also includes:

[0078] The fixing bracket arranged parallel to the scraper is used to fix the chain break monitoring circuit 1 above the scraper.

[0079] In the utility model, the fault detection device of the scraper conveyor chain is also provided with a fixed bracket arranged parallel to the scraper. The function of the fixed bracket is to fix the chain break monitoring circuit 1 above the scraper so that the chain break monitoring circuit 1 is in a parallel state with the scraper conveyor chain, thereby accurately detecting the chain break of the scraper conveyor chain.

[0080] It should be noted that in actual applications, a fixed bracket is generally made of 1.2M / 0.2M angle iron, which is placed vertically above the observation port of the scraper machine, 20 cm away from the edge, welded and fixed. Two XL5-B travel switches are vertically installed on the fixed bracket, and the contact points of the two travel switches are ensured to be on a horizontal line. The scraper and the two travel switch contacts maintain a 2cm contact surface to achieve parallel contact. Lay 2.5mm 2 Switch signal line, select two normally open points of the travel switch, and connect them in series to the detection circuit. The detection diagram of the two controllable switches and the scraper of the scraper conveyor chain fault detection device is as follows Figure 2 As shown in the structure diagram Figure 3 As shown, the intermediate relay is used to transmit signals and control multiple circuits at the same time. In this circuit, a group of normally open points are connected to the warning light, and a group of normally closed points are connected to the emergency stop. When the intermediate relay is energized, the entire protection action will be completed.

[0081] It should also be noted that when an LED warning light is selected as an alarm device, it should be installed in a conspicuous position 1m above the fixed bracket. When a scraper chain failure occurs, the scraper and the two travel switches cannot be in parallel contact at the same time. The two travel switches will appear normally closed at the same time, and the feedback point will output 24V power supply. The relay will be energized to connect the emergency stop signal and immediately stop the machine, and the sound and light alarm will be activated. The wiring diagram of the scraper conveyor chain failure detection device is as follows Figure 4 As shown in the figure, the alarm circuit control principle and the emergency stop circuit control principle are as follows Figure 5 shown.

[0082] As an optional embodiment, it also includes:

[0083] Emergency stop switch, the input end of the emergency stop switch is connected to the output end of the link break monitoring circuit 1, and the output end is connected to the control end of the first controllable switch 3 and the control end of the second controllable switch 4, which is used to control the power on and off of the control end of the first controllable switch 3 and the control end of the second controllable switch 4.

[0084] In the utility model, an emergency stop switch is also provided in the fault detection device of the scraper conveyor chain. Since the emergency stop switch is arranged on the power supply circuit of the control end of the first controllable switch 3 and the control end of the second controllable switch 4, the emergency stop switch can be closed when the conveyor chain needs to be repaired; conversely, if the conveyor chain does not need to be repaired, the emergency stop switch can be disconnected. At this time, the chain break monitoring circuit 1 cannot perform chain break detection, and the control end of the first controllable switch 3 and the control end of the second controllable switch 4 cannot be powered, thereby turning off the alarm function and the scraper conveyor chain, so as to facilitate the maintenance of the scraper conveyor chain at any time.

[0085] It should be noted that the power supply is cut off quickly, thereby cutting off the power connection with the equipment or circuit. In the circuit, it is the emergency stop contact of the scraper controller, and the normally closed contact is opened after the intermediate relay is closed to achieve protection.

[0086] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0087] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fault detection device for a scraper conveyor chain, characterized in that: include: A chain break monitoring circuit is arranged at a preset position above the scraper, contacts the scraper when it moves below the preset position, and has an output end connected to a control end of a first controllable switch and a control end of a second controllable switch, and is used to control the first controllable switch to be closed and the second controllable switch to be disconnected when the conveying chain of the scraper is disconnected; Alarm module; The first controllable switch is connected in series with the alarm module and the series circuit is connected to a DC power supply; The second controllable switch is connected in series with the scraper controller, and the series circuit is connected to the DC power supply.

2. The fault detection device for a scraper conveyor chain according to claim 1, characterized in that: The link break monitoring circuit comprises: A first travel switch is arranged at a first preset position above the scraper, a first end of a first travel switch normally open contact of the first travel switch is connected to a live wire of an AC power source, and a first end of a first travel switch normally closed contact is connected to a live wire of the AC power source, and is used for closing the first travel switch normally open contact and disconnecting the first travel switch normally closed contact when the contact head of the first travel switch contacts the scraper; A second travel switch is arranged at a second preset position above the scraper, wherein a first end of a second travel switch normally closed contact of the second travel switch is connected to a second end of a normally open contact of the first travel switch, a first end of a second travel switch normally open contact of the second travel switch is connected to a second end of a normally closed contact of the first travel switch, a second end of a second travel switch normally open contact of the second travel switch and a second end of a second travel switch normally closed contact of the second travel switch are both connected to a control end of the first controllable switch and a control end of the second controllable switch, so that when a contact head of the second travel switch contacts the scraper, the normally open contact of the second travel switch is closed, the normally closed contact of the second travel switch is disconnected, and the first preset position is a preset distance away from the second preset position; Wherein, when the scraper operates normally to the preset position, the contact head of the first travel switch and the contact head of the second travel switch contact the scraper at the same time.

3. The fault detection device for a scraper conveyor chain according to claim 2, characterized in that: The first controllable switch comprises: A first coil, wherein a first end of the first coil is connected to a second end of a normally open contact of the second travel switch and a second end of a normally closed contact of the second travel switch, and a second end of the first coil is connected to a neutral line of the AC power supply, for obtaining power when the transmission chain is disconnected; A first controllable switch normally open contact is connected in series with the alarm module and the series circuit is connected to the DC power supply, and is used for closing when the first coil is energized to energize the alarm module.

4. The fault detection device for a scraper conveyor chain according to claim 3, characterized in that: The second controllable switch comprises: a second coil, wherein a first end of the second coil is connected to a second end of a normally open contact of the second travel switch and a second end of a normally closed contact of the second travel switch, and a second end is connected to a neutral line of the AC power supply, and is used to be powered when the transmission chain is disconnected, and the first coil and the second coil are the same coil; The second controllable switch normally closed contact is connected in series with the scraper controller and the series circuit is connected to the DC power supply, and is used for disconnecting when the second coil is energized to make the scraper controller lose power.

5. The fault detection device for a scraper conveyor chain according to claim 1, characterized in that: The alarm module is a display alarm module and / or a sound alarm module, which is connected in series with the first controllable switch and the series circuit is connected to the DC power supply, and is used for performing corresponding display alarm and / or sound alarm when the first controllable switch is closed.

6. The fault detection device for a scraper conveyor chain according to claim 2, characterized in that: Also includes: The DC power supply.

7. The fault detection device for a scraper conveyor chain according to claim 6, characterized in that: The DC power supply comprises: A rectifier module, the input end of which is connected to the AC power source, and the output end of which is connected to the input end of the transformer module, for converting the AC power transmitted by the AC power source into corresponding DC power; The transformer module, the output end of which is connected to the circuit of the first controllable switch and the alarm module in series, is used to convert the voltage of the DC power into a first working voltage required for the normal operation of the alarm module and a second working voltage required for the normal operation of the scraper controller.

8. The fault detection device for a scraper conveyor chain according to claim 2, characterized in that: Also includes: A fuse, wherein the input end of the fuse is connected to the live wire of the AC power supply, and the output end is connected to the first end of the normally open contact of the first travel switch and the first end of the normally closed contact of the first travel switch, and is used to disconnect when an overcurrent occurs in the circuit.

9. The fault detection device for a scraper conveyor chain according to claim 1, characterized in that: Also includes: A fixing bracket arranged parallel to the scraper plate is used to fix the chain break monitoring circuit above the scraper plate.

10. The fault detection device for a scraper conveyor chain according to any one of claims 1 to 9, characterized in that: Also includes: An emergency stop switch, wherein the input end of the emergency stop switch is connected to the output end of the link break monitoring circuit, and the output end is connected to the control end of the first controllable switch and the control end of the second controllable switch, and is used to control the power on and off of the control end of the first controllable switch and the control end of the second controllable switch.

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