Accident protection device and belt conveyor protection system

Abstract

The utility model discloses an accident protection device and a belt conveyor protection system, and belongs to the technical field of protection devices. The device comprises an accident control loop, an alarm control loop, a first low-voltage line and a first control switch, the first control switch and the accident control loop are sequentially connected in series in the first low-voltage line; the alarm control loop comprises a contactor and an alarm device, a main contact of the contactor is connected with the accident control loop in parallel, and an auxiliary contact of the contactor, the alarm device and a power supply are sequentially connected in series. According to the device, when the first control switch trips, alarm information can be sent to a user through the alarm device, so that the user can know that the reason of failure of the accident control loop is tripping of the first control switch, the fault reason can be quickly found out, the overhaul and maintenance time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of protection devices, and in particular to an accident protection device and a belt conveyor protection system. Background Art

[0002] A blast furnace is a continuous iron-making equipment. The blast furnace uses a lot of production equipment from loading ore into the top of the furnace, blowing hot air into the tuyere at the bottom of the furnace, to finally producing iron. The safe operation of each production equipment can ensure the stability of production efficiency and the personal safety of production personnel.

[0003] In the prior art, when some production equipment is undergoing maintenance or temporarily dealing with on-site accidents, the power supply of the relevant production equipment will be disconnected through the emergency switch to stop it from running, so as to avoid mechanical injury accidents. However, sometimes the emergency switch fails and the power supply of the relevant production equipment cannot be disconnected. The on-site personnel have to analyze and troubleshoot the cause of the failure bit by bit, which takes a long time and affects the production efficiency of the blast furnace. Utility Model Content

[0004] In view of the above problems, the present application is proposed to provide an accident protection device and a belt conveyor protection system that solve the above problems. When the control switch of the low-voltage power supply of the accident control circuit trips, an alarm message can be sent to the user through the alarm device, so that the user knows that the cause of the failure of the accident control circuit is the tripping of the control switch of the low-voltage power supply, thereby quickly finding out the cause of the fault, reducing the inspection and maintenance time, and improving production efficiency.

[0005] In a first aspect, the present application provides an accident protection device, the device comprising an accident control circuit, an alarm control circuit, a first low-voltage circuit and a first control switch;

[0006] The first control switch and the accident control circuit are sequentially connected in series in the first low-voltage circuit;

[0007] The alarm control circuit includes a contactor and an alarm device, the main contact of the contactor is connected in parallel with the accident control circuit, and the auxiliary contact of the contactor, the alarm device and the power supply are connected in series in sequence.

[0008] Optionally, the device further comprises a start-stop control circuit of the production equipment;

[0009] The accident control circuit includes an accident switch and a relay. The main contacts of the accident switch and the relay are connected in series in the first low-voltage circuit in sequence, and the auxiliary contacts of the relay are connected in series in the start-stop control circuit.

[0010] Optionally, the normally closed contact of the relay is connected in series in the start-stop control loop.

[0011] Optionally, the production equipment is a belt conveyor of a blast furnace.

[0012] Optionally, the device further comprises a second control switch;

[0013] The second control switch is connected in series between the first control switch and the accident control loop.

[0014] Optionally, the normally closed contact of the contactor and the alarm device are connected in series in the second low-voltage circuit.

[0015] Optionally, the first control switch is arranged in a control box of a low-voltage distribution room.

[0016] Optionally, the second control switch is arranged in a control box at the production site.

[0017] Optionally, the alarm device includes an audible and visual alarm.

[0018] In a second aspect, the present application provides a belt conveyor protection system, the system comprising any accident protection device described in the first aspect.

[0019] The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages:

[0020] The embodiment of the present application provides an accident protection device and a belt conveyor protection system, the device includes an accident control circuit, an alarm control circuit and a first control switch; the first control switch and the accident control circuit are connected in series in the first low-voltage circuit in sequence, and the first control switch controls the connection and disconnection of the low-voltage power supply of the accident control circuit; the alarm control circuit includes a contactor and an alarm device, the main contact of the contactor is connected in parallel with the accident control circuit, and the auxiliary contact of the contactor, the alarm device and the power supply are connected in series in sequence, so that the first control switch can also control the connection and disconnection of the contactor main circuit, so as to control the alarm device to alarm through the contactor. The device can send an alarm message to the user through the alarm device when the first control switch trips, so that the user knows that the cause of the failure of the accident control circuit is the tripping of the first control switch, thereby quickly finding out the cause of the fault, reducing the time for inspection and maintenance, and improving production efficiency.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 is a schematic diagram of the circuit structure of an accident protection device provided in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of the circuit structure of another accident protection device provided in an embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of a connection circuit structure between a contactor and an alarm device provided in an embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the circuit structure of another accident protection device provided in an embodiment of the present application;

[0027] Figure 5 It is a schematic diagram of the circuit structure of another accident protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0029] Figure 1 is a schematic diagram of a circuit structure of an accident protection device provided in an embodiment of the present application, such as Figure 1 As shown, the device 1 includes an accident control circuit 2, an alarm control circuit 3, a first low-voltage line 4 and a first control switch K1. The first control switch K1 and the accident control circuit 2 are connected in series in the first low-voltage line 4; the alarm control circuit 3 includes a contactor KM and an alarm device B, the main contact of the contactor KM is connected in parallel with the accident control circuit 2, and the auxiliary contact of the contactor KM, the alarm device B and the power supply E are connected in series in sequence.

[0030] In this embodiment, the accident control loop 2 is used to disconnect the power supply of the relevant production equipment when the production equipment is under maintenance or temporarily handles the on-site accident, so that the relevant production equipment stops running to avoid mechanical injury accidents. The first low-voltage line 4 can provide a low-voltage power supply. When the first control switch K1 is closed, the accident control loop 2 is connected to the low-voltage power supply, so that the accident control loop 2 can work normally; when the first control switch K1 is disconnected, the accident control loop 2 disconnects the low-voltage power supply, so that the accident control loop 2 cannot work normally.

[0031] The main contacts of the contactor KM in the alarm control circuit 3 are connected in parallel with the accident control circuit 2, so that the first control switch K1 can also control the connection and disconnection of the main circuit of the contactor KM. The auxiliary contacts of the contactor KM, the alarm device B and the power supply E are connected in series in sequence. The power supply E is used to supply power to the alarm device B, thereby controlling whether the alarm device B is connected to the power supply through the connection and disconnection of the auxiliary contacts of the contactor KM, thereby controlling whether the alarm device B alarms.

[0032] In actual production, when a ground fault occurs at the operation site, it may cause the first control switch K1 to trip, the power supply of the accident control loop 2 is disconnected, and the accident control loop 2 cannot normally control the on and off of the power supply of the production equipment, and cannot ensure the normal operation of the production equipment, which seriously affects the daily production order of the blast furnace. The blast furnace is a continuous production nature and cannot be temporarily shut down for more than 10 minutes due to equipment failure. Therefore, the device 1 in this application can disconnect the power supply of the contactor KM of the alarm control loop 3 when the first control switch K1 trips and the accident control loop 2 cannot work normally, so that the auxiliary contact of the contactor KM is actuated, so that the alarm device B sends an alarm message to the user, so that the user knows that the reason for the failure of the accident control loop 2 is the tripping of the first control switch K1, so as to quickly find out the cause of the fault, reduce the time for inspection and maintenance, improve production efficiency, and also provide protection for the safety behavior of maintenance personnel.

[0033] Optionally, the first control switch K1 is arranged in a control box of a low-voltage distribution room.

[0034] In this embodiment, the first low-voltage line is generally led from the low-voltage distribution room to the production site, so the first control switch K1 is arranged in the control box of the low-voltage distribution room. The first control switch K1 can be operated in the low-voltage distribution room to control whether the first low-voltage line 4 is connected to the power supply.

[0035] Optionally, the device 1 also includes a start-stop control circuit of the production equipment; the accident control circuit 2 includes an accident switch SE and a relay KA, the main contacts of the accident switch SE and the relay KA are connected in series in the first low-voltage line 4 in sequence, and the auxiliary contacts of the relay KA are connected in series in the start-stop control circuit.

[0036] In this embodiment, when the production equipment is operating normally, a low-voltage power supply is provided to the emergency switch SE through the first low-voltage line 4, and the on-off of the auxiliary contacts of the emergency switch SE is controlled by the on-off of the relay KA, thereby controlling the on-off of the start-stop control circuit, and further controlling the start-stop of the production equipment.

[0037] Optionally, the normally closed contact of relay KA is connected in series in the start-stop control circuit.

[0038] In this embodiment, when the production equipment is operating normally, the first control switch K1 is closed, the accident switch SE can be in an open state, and the normally closed contact of the relay KA is connected in series in the start-stop control circuit. The normally closed contact is in a closed state at this time, so that the power supply of the production equipment is connected, so that the production equipment can operate normally. When the production equipment needs to be repaired and maintained or temporarily handle an on-site accident, the accident switch SE is switched from an open state to a closed state, so that the main circuit of the relay KA is connected, so that the normally closed contact of the relay KA changes from a closed state to an open state, and then the start-stop control circuit of the production equipment is disconnected, so that the power supply of the production equipment is cut off, and the production equipment stops running, and relevant personnel can perform maintenance on the production equipment or handle on-site accidents.

[0039] Optionally, the production equipment is a belt conveyor of a blast furnace.

[0040] In this embodiment, the blast furnace is a continuous ironmaking equipment, which is equipped with two main belts. The continuous operation of the main belts can transport raw materials to the top of the blast furnace, and distribute the materials to the furnace through the top equipment. During the inspection and maintenance of the post or the temporary handling of the on-site fault, the belt conveyor must be controlled to stop working to prevent the belt from causing mechanical damage, so the blast furnace belt conveyor needs a safety protection device to control the belt operation and stop. Therefore, an accident control loop 2 is set on both sides of the belt conveyor. By closing the accident switch SE in the accident control loop 2, the main circuit of the relay KA is connected, so that the normally closed contact of the relay KA changes from the closed state to the open state, and then the start-stop control loop of the belt conveyor is disconnected, so that the power supply of the belt conveyor is cut off and the belt conveyor stops running.

[0041] Figure 2 is a schematic diagram of the circuit structure of another accident protection device provided in an embodiment of the present application, such as Figure 2 As shown, the device 1 further includes a second control switch K2 ; the second control switch K2 is connected in series between the first control switch K1 and the accident control loop 2 .

[0042] In this embodiment, a second control switch K2 may be connected in series between the first control switch K1 and the accident control circuit 2. Like the first control switch K1, the second control switch K2 may be used to control whether the accident control circuit 2 and the alarm control circuit 3 are powered on, thereby making the device 1 safer and more reliable. For example, when the first control switch K1 fails, the power supplies of the accident control circuit 2 and the alarm control circuit 3 may be cut off through the second control switch K2.

[0043] Optionally, the second control switch K2 is arranged in a control box at the production site.

[0044] In this embodiment, by arranging a second control switch K2 in the control box at the production site, it is possible to control whether the accident control circuit 2 and the alarm control circuit 3 are connected to the power supply at the production site, making the control of the device 1 more convenient. In an emergency, the power-off operation can be performed directly on site without running to the low-voltage distribution room.

[0045] Figure 3 : is a schematic diagram of a connection circuit structure between a contactor and an alarm device provided in an embodiment of the present application, such as Figure 3 The normally closed contact of the contactor KM and the alarm device B are connected in series in the second low-voltage line 5.

[0046] In this embodiment, the power supply E of the alarm device B can be provided through the first low-voltage line 4, but in order to ensure that the alarm device B can alarm in time, the power supply E of the alarm device B and the power supply of the accident control circuit 2 can be separated, that is, the power supply E is provided by a second low-voltage line 5 which is relatively independent of the first low-voltage line 4, so that when the first control switch K1 or the second control switch K2 on the first low-voltage line 4 trips, the alarm device B can still use the power supply in the second low-voltage line 5, thereby realizing the normal alarm function.

[0047] Specifically, when the first low-voltage line 4 fails, or the first control switch K1 trips due to serious wear and tear of the line insulation layer at a certain point on site, or the second control switch K2 trips due to some reasons, the low-voltage power supply of the accident control circuit 2 is disconnected, the accident switch SE fails to operate, and the production equipment cannot be stopped. At this time, the main circuit of the contactor KM also disconnects the low-voltage power supply, so that the normally closed contact of the contactor KM is in a closed state, and the alarm device B connects the power supply E in the second low-voltage line 5. Similarly, when the first control switch K1 and the second control switch K2 are normally connected, the main circuit of the contactor KM is also connected, and the normally closed contact of the contactor KM is in a disconnected state, and the alarm device B is not connected to the power supply E, so there will be no alarm.

[0048] It should be noted that if the alarm device B uses the power supply in the first low-voltage line 4, the opposite principle needs to be used to control the alarm device B to alarm.

[0049] Figure 4 is a schematic diagram of the circuit structure of another accident protection device provided in an embodiment of the present application, such as Figure 4As shown, the normally open contact of the contactor KM and the alarm device B are connected in series in the first low-voltage circuit 4, wherein one contact of the normally open contact of the contactor KM is connected to the load end of the first control switch K1, the other contact of the normally open contact of the contactor KM is connected to one end of the alarm device B, and the other end of the alarm device B is connected to the neutral line end of the first low-voltage circuit. When the first control switch K1 is normally connected, the main circuit of the contactor KM is also connected, the normally open contact of the contactor KM is in a closed state, the alarm device B works normally, and emits a normal prompt sound or light. When the first control switch K1 trips, the main circuit of the contactor KM is also disconnected, the normally open contact of the contactor KM is in a disconnected state, the alarm device B cannot work, and the normal prompt sound or light disappears at this time. If the personnel find that the prompt sound or light disappears, they know that the failure of the accident control circuit 2 is caused by the tripping of the first control switch K1.

[0050] Figure 5 This is a schematic diagram of the circuit structure of another accident protection device provided by the embodiment of the present application. The normally closed contact of the contactor KM and the alarm device B are connected in series in the first low-voltage line 4 in sequence. However, one contact of the normally closed contact of the contactor KM is directly connected to the live wire end of the first control switch K1, and the other contact of the normally closed contact of the contactor KM is connected to one end of the alarm device B, and the other end of the alarm device B is connected to the neutral wire end of the first low-voltage line. When the first control switch K1 trips, the alarm device B is still powered on and can work normally. Therefore, when the first control switch K1 trips, the main circuit of the contactor KM is also disconnected, and the normally closed contact of the contactor KM is in a closed state. The alarm device B works normally and alarms. According to the alarm information of the alarm device, the staff knows that the failure of the accident control circuit 2 is caused by the tripping of the first control switch K1.

[0051] Optionally, the alarm device B includes an audible and visual alarm.

[0052] In this embodiment, the use of sound and light alarms can make it easier for workers to discover alarm information at the production site.

[0053] The device 1 can send out an alarm immediately when a ground fault occurs at the work site, and the site can take effective measures to ensure the normal operation of the belt conveyor, thereby improving production efficiency. In addition, the device 1 is easy to operate, reduces the probability of blast furnace material shortage, and improves the stability of continuous production of the blast furnace.

[0054] Based on the same concept, an embodiment of the present application also provides a belt conveyor protection system, which includes the accident protection device in the above embodiment.

[0055] During post inspections, overhauls and maintenance or temporary handling of on-site faults, the belt conveyor must be stopped to prevent mechanical damage to the belt. The power supply of the belt conveyor is disconnected through the accident control circuit, and the belt conveyor stops running. However, when the first low-voltage line fails, or the first control switch trips due to severe wear and tear of the insulation layer of the line at a certain point on site and leakage and grounding, the low-voltage power supply of the accident control circuit is disconnected, the accident switch fails to operate, and the production equipment cannot be stopped. At this time, the main circuit of the contactor also disconnects the low-voltage power supply, causing the auxiliary contacts of the contactor to operate, and the alarm device sends an alarm message, so that the user knows that the cause of the failure of the accident control circuit is the tripping of the first control switch, thereby quickly finding out the cause of the fault, reducing the time for overhaul and maintenance, and improving production efficiency. At the same time, it also provides protection for the safety behavior of maintenance personnel.

[0056] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0057] The embodiment of the present application provides an accident protection device and a belt conveyor protection system, the device includes an accident control circuit, an alarm control circuit and a first control switch; the first control switch and the accident control circuit are connected in series in the first low-voltage circuit in sequence, and the first control switch controls the connection and disconnection of the low-voltage power supply of the accident control circuit; the alarm control circuit includes a contactor and an alarm device, the main contact of the contactor is connected in parallel with the accident control circuit, and the auxiliary contact of the contactor, the alarm device and the power supply are connected in series in sequence, so that the first control switch can also control the connection and disconnection of the contactor main circuit, so as to control the alarm device to alarm through the contactor. The device can send an alarm message to the user through the alarm device when the first control switch trips, so that the user knows that the cause of the failure of the accident control circuit is the tripping of the first control switch, thereby quickly finding out the cause of the fault, reducing the time for inspection and maintenance, and improving production efficiency.

[0058] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0059] Similarly, it should be understood that in order to streamline the present disclosure and help understand one or more of the various application aspects, in the above description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the claims below, the application aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0060] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of multiple such components. The present application may be implemented by means of hardware including several different components and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. An accident protection device, characterized in that: The device comprises an accident control circuit, an alarm control circuit, a first low-voltage circuit and a first control switch; The first control switch and the accident control circuit are sequentially connected in series in the first low-voltage circuit; The alarm control circuit includes a contactor and an alarm device, the main contact of the contactor is connected in parallel with the accident control circuit, and the auxiliary contact of the contactor, the alarm device and the power supply are connected in series in sequence.

2. The accident protection device according to claim 1, characterized in that: The device also includes a start-stop control circuit for the production equipment; The accident control circuit includes an accident switch and a relay. The main contacts of the accident switch and the relay are connected in series in the first low-voltage circuit in sequence, and the auxiliary contacts of the relay are connected in series in the start-stop control circuit.

3. The accident protection device according to claim 2, characterized in that: The normally closed contact of the relay is connected in series in the start-stop control loop.

4. The accident protection device according to claim 2, characterized in that: The production equipment is a belt conveyor of a blast furnace.

5. The accident protection device according to claim 1, characterized in that: The device also includes a second control switch; The second control switch is connected in series between the first control switch and the accident control loop.

6. The accident protection device according to claim 1, characterized in that: The normally closed contact of the contactor and the alarm device are sequentially connected in series in the second low-voltage circuit.

7. The accident protection device according to claim 1, characterized in that: The first control switch is arranged in a control box of a low-voltage distribution room.

8. The accident protection device according to claim 5, characterized in that: The second control switch is arranged in a control box at the production site.

9. The accident protection device according to claim 1, characterized in that: The alarm device comprises an audible and visual alarm.

10. A belt conveyor protection system, characterized in that: The system comprises the accident protection device according to any one of claims 1-9.

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