Mining coal flow monitoring device

Abstract

A mining coal flow monitoring device belongs to the technical field of monitoring equipment and comprises an audible and visual alarm, a shell, a voltage comparator, a rotating detection mechanism, a flow detection mechanism and a detection circuit. The number of the detection circuits, the number of the audible and visual alarms and the number of the voltage comparators are at least two, the rotating detection mechanism comprises a rotating cylinder, a generator and a connecting shaft, the flow detection mechanism comprises a guide cylinder, a movable block, a spring, a pressure sensor, a supporting plate and a fixing base, the voltage comparators and the detection circuits are installed in the shell, and the audible and visual alarms are installed in the element box. Under the action of the first voltage comparator, the rotation detection mechanism, the first detection circuit and the like, when the electric belt conveyor stops working, a manager can be prompted through the first audible and visual alarm; under the action of a second voltage comparator, a flow detection mechanism, a second detection circuit and the like, when the flow of coal briquettes and the like is relatively small, management personnel can be prompted through a second audible and visual alarm. Normal production is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of monitoring equipment technology, and in particular to a coal flow monitoring device for mining. Background Technology

[0002] Electric belt conveyors are a widely used type of conveying equipment in coal mines and other production areas. Their main function is to transfer mined coal from one workstation to another (for example, transferring coal excavated inside a mine to the mine entrance). Their core components include a flexible ring conveyor belt, a drive unit (composed of an electric motor, reducer, and drive drum to provide power to the conveyor), a support system (idlers, arranged in a distributed manner to reduce running resistance and support the conveyor belt), a drive drum (used to transmit power), a redirecting drum (used to adjust the conveying direction), and a tensioning device.

[0003] While existing electric belt conveyors used for coal conveying meet production needs to a certain extent, they still have some technical shortcomings that urgently need improvement due to structural limitations. (1): When relevant management personnel are not on-site, it is impossible to know whether the equipment is in normal working condition (e.g., relevant staff are slacking off, the machine is not turned on during working hours, or the equipment is damaged and the workers in the work area do not report the fault in time). The equipment is not working during the working hours, which will have an adverse impact on normal production and work efficiency. (2): It is impossible to know the coal flow situation when the equipment is working (e.g., the amount of coal conveyed to the conveyor belt is reduced due to various reasons in the previous process). In other words, when the amount of coal conveyed is small, it is impossible to know the specific situation when the management personnel are not on-site, which will also have an adverse impact on normal production and relatively low work efficiency. Based on the above factors, it is still very necessary to provide a coal flow monitoring device that can be used with electric belt conveyors and can monitor whether the equipment is in normal working condition in real time. Utility Model Content

[0004] To overcome the shortcomings of existing electric belt conveyors, which lack suitable monitoring equipment due to structural limitations and suffer from the drawbacks described in the background art, this utility model provides a mining coal flow monitoring device that works in conjunction with an electric belt conveyor. In application, when the electric belt conveyor stops working or the coal flow decreases, it can promptly alert relevant management personnel through an audible and visual alarm, thereby ensuring normal production as much as possible and improving work efficiency.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A coal flow monitoring device for mining includes an audible and visual alarm, a housing, a voltage comparator, and also a rotation detection mechanism, a flow detection mechanism, and a detection circuit. The detection circuit, audible and visual alarm, and voltage comparator each have at least two paths. The rotation detection mechanism includes a rotating drum, a generator, and a connecting shaft. Both ends of the connecting shaft are rotatably mounted inside the rotating drum. The stator coil of the generator is fixedly mounted on the outer end of the connecting shaft, and the generator's magnet ring is fixedly mounted on the inner end of the rotating drum. The flow detection mechanism includes a guide cylinder, a movable block, a spring, a pressure sensor, a support plate, and a fixed base. The lower end of the guide cylinder is fixedly mounted on the upper end of the support plate. The pressure sensor is fixedly mounted inside the lower end of the guide cylinder, with its force-bearing surface located at the upper part. The spring and the movable block are movably fitted inside the guide cylinder. The upper end of the guide cylinder has an opening. A guide rod is fixedly installed on the upper end of the movable block; the upper two sides of the fixed seat and the two outer ends of the connecting shaft are fixedly installed together, and the lower end of the fixed seat and the upper end of the guide rod are fixedly installed together; the voltage comparator and detection circuit are installed in the electrical control box, the two audible and visual alarms are installed in the monitoring room, the lower end of the support plate is installed on the upper end of the frame of the electric belt conveyor, and the upper end of the guide cylinder is in contact with the lower side of the upper end of the conveyor belt of the electric belt conveyor; the signal output terminal of the pressure sensor, the power output terminal of the generator and the signal input terminal of the two detection circuits are electrically connected respectively, the signal output terminal of the two detection circuits and the signal input terminal of the two voltage comparators are electrically connected respectively, and the power output terminal of the two voltage comparators and the power input terminal of the two audible and visual alarms are electrically connected respectively.

[0007] Furthermore, the distance between the inner end of the magnet and the outer end of the stator coil is [not specified].

[0008] Furthermore, the outer diameter of the movable block is smaller than the inner diameter of the guide cylinder.

[0009] Furthermore, the height of the spring is greater than the height inside the guide tube.

[0010] Furthermore, the distance between the lower inner end of the fixed seat and the lower end of the rotating drum.

[0011] Furthermore, the first detection circuit includes an adjustable resistor and a resistor that are electrically connected, with one end of the resistor and one end of the adjustable resistor connected together.

[0012] Furthermore, the second detection circuit includes an adjustable resistor, a resistor, a bridge rectifier, and a capacitor that are electrically connected. The positive power output terminal of the bridge rectifier is connected to the positive terminal of the capacitor and one end of the adjustable resistor. The negative power output terminal of the bridge rectifier is connected to the negative terminal of the capacitor and one end of the resistor. The other end of the adjustable resistor is connected to the other end of the resistor.

[0013] Compared with existing technologies, the advantages of this invention are as follows: When used in conjunction with an electric belt conveyor, under the action of the first voltage comparator, rotation detection mechanism, and first detection circuit, the electric belt conveyor can alert management personnel via a first-channel audible and visual alarm when it stops working; under the action of the second voltage comparator, flow detection mechanism, and second detection circuit, when the flow rate of coal blocks or other materials output by the electric belt conveyor is relatively low, the first and second audible and visual alarms can alert management personnel. This invention ensures normal production as much as possible and correspondingly improves work efficiency. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a structural diagram of the present invention and the electric belt conveyor.

[0016] Figure 2 This is a partial structural schematic diagram of the present invention.

[0017] Figure 3 This is the circuit diagram of this utility model. Detailed Implementation

[0018] Figure 1 , 2As shown in Figure 3, the mine coal flow monitoring device includes a power module A1, audible and visual alarms B1 and B2, a housing 1, voltage comparators A2 and A3, and also has a rotation detection mechanism, a flow detection mechanism, and a detection circuit 2; the detection circuit 2, the audible and visual alarms B1 and B2, and the voltage comparators A2 and A3 each have two paths; the rotation detection mechanism includes a rotating drum 31, bearings 32, a generator M, and a hollow connecting shaft 33. The left and right sides of the rotating drum 31 each have an opening in the middle. There are at least two bearings 32, which are respectively fixedly installed on the left and right sides of the middle part of the rotating drum 31. The left and right ends of the connecting shaft 33 are respectively fixedly installed inside the inner rings of the two bearings 32. Furthermore, the left and right ends of the connecting shaft 33 are located outside the left and right ends of the rotating drum 31 through openings. The stator coil 34 of the generator is fixedly installed on the outer end of the middle part of the connecting shaft 33, and the annular hollow permanent magnet ring 35 of the generator is fixedly installed in the middle of the inner end of the rotating drum 31. There is an inlet hole on the right side of the coil on the connecting shaft 33. The wire connected to the coil 34 enters the connecting shaft 33 through the inlet hole and is led out from the right outer end of the connecting shaft 33 to the outside of the rotating drum 31. The flow detection mechanism includes a rectangular guide cylinder 41, a rectangular movable block 42, a spring 43, a pressure sensor A4, a support plate 44, and a fixed seat 45. The lower outer end of the guide cylinder 41 is fixedly installed in the middle of the upper end of the support plate 44. The pressure sensor A4... A4 is fixedly installed in the lower middle part of the guide cylinder 41 (which guides the movable block 42), with its force-bearing surface located at the upper part. Spring 43 and movable block 42 are sequentially movably sleeved inside the guide cylinder 41 from bottom to top. Spring 43 is located between pressure sensor A4 (the wire connected to pressure sensor A4 is led outward through opening A at the lower right outer end of the guide cylinder) and movable block 42. The guide cylinder 41 has an opening A at the upper middle part. A guide rod 421 is fixedly installed at the upper middle part of the movable block 42. The guide rod 421 is movably located outside the opening A at the upper end of the guide cylinder 41 (the guide rod 421 is located upward through opening A outside the upper end of the guide cylinder 41). The "U"-shaped fixing seat 45 (support) The upper inner sides of the support plate 44 and the lower parts of the two outer sides of the connecting shaft 33 are fixedly installed together. The lower middle part of the fixed seat 45 and the upper end of the guide rod 421 are fixedly installed together. The power module A1, voltage comparators A2 and A3, and detection circuit 2 are installed on the circuit board inside the housing 1. The housing 1 is fixedly installed in the electrical control box of the electric belt conveyor 5. The two sound and light alarms B1 and B2 are installed in the component box 6 in the management office, which is far away from the production area. The lower sides of the support plate 44 are fixedly installed on the upper middle parts of the frame 51 of the electric belt conveyor, and the upper end of the rotating drum 31 is in contact with the lower side of the upper end of the conveyor belt 52 of the electric belt conveyor.

[0019] Figure 1 , 2As shown in Figure 3, the inner end of magnet 35 and the outer end of coil 34 are spaced a certain distance apart. The outer diameter of movable block 42 is smaller than the inner diameter of guide cylinder 41. The height of spring 43 is slightly greater than the height inside guide cylinder 41. The lower inner end of fixed seat 45 and the lower end of rotating cylinder 31 are spaced apart. The first detection circuit includes adjustable resistor RP1 and resistor R1 connected via circuit board wiring, with one end of resistor R1 connected to one end of adjustable resistor RP1. The second detection circuit includes adjustable resistor RP2, resistor R2, bridge rectifier A5, and capacitor C connected via circuit board wiring, with the positive power output terminal 3 of bridge rectifier A5 connected to the positive terminal of capacitor C and one end of adjustable resistor RP2, the negative power output terminal 4 of bridge rectifier A5 connected to the negative terminal of capacitor C and one end of resistor R2, and the other end of adjustable resistor RP2 connected to the other end of resistor R2. The power input terminals 1 and 2 of power module A1 are connected to the two poles of AC 220V power supply via wires. The power output pins 3 and 4 of power module A1, the other ends of resistors R1 and R2 of the two detection circuits, the power input pins 4 and 5 of voltage comparators A2 and A3, and the power input pins 1 and 2 of pressure sensor A4 are connected by wires. The signal output pin 3 of pressure sensor A4, the power output of generator M, the other end of adjustable resistor RP1 of the two detection circuits, and pins 1 and 2 of bridge rectifier A5 are connected by wires. One end of resistor R1 and one end of resistor R2 of the two detection circuits are connected by wires to the signal input pins 3 of voltage comparators A2 and A3. The power output pins 6 and 5 of voltage comparators A2 and A3 are connected by wires to the power input pins of audible and visual alarms B1 and B2. The ground terminal (pin 2), negative signal input terminal (pin 1), and negative power input terminal (pin 5) of the two voltage comparators A2 and A3 are connected by a wire; the positive power input terminal (pin 4) and control power input terminal (pin 7) of the two voltage comparators A2 and A3 are connected.

[0020] Figure 1 , 2As shown in Figure 3, after the 220V power supply enters the power input terminal of the power module A1, the power module A1 outputs a stable 12V DC power supply through pins 3 and 4, which then enters the power input terminals of the two voltage comparators, two detection circuits, pressure sensors, etc. In this new type, when the electric belt conveyor 5 is working normally, its upper conveyor belt 52 will move counterclockwise, and then the lower end of the conveyor belt will drive the magnet of the generator M to rotate through the rotating drum 31. The stator coil of the generator is subjected to the action of cutting the magnetic lines of force, and outputs about 12V AC power supply, which enters the power input terminal of the bridge rectifier M. The DC power supply output from pins 3 and 4 of the bridge rectifier M is filtered by capacitor C and then enters the other end of the adjustable resistor RP2. The DC power supply is divided by the adjustable resistor RP2 and resistor R2 and enters the signal input terminal 3 of the voltage comparator A3. At this time, the voltage is about 6.1V, which is greater than the internal threshold voltage of the voltage comparator A3 (e.g., 6V). The voltage comparator A3 has no output at pin 6, and the alarm B1 will not be powered on to emit an audible and visual signal, indicating that the electric belt conveyor 5 is in normal working condition. When the electric belt conveyor 5 malfunctions (e.g., the conveyor belt breaks, the motor short-circuits, or the motor performance deteriorates, causing the conveyor belt speed to slow down), the upper conveyor belt 52 will stop rotating counterclockwise, the lower end of the conveyor belt will no longer drive the magnet of the generator M to rotate, and the generator will no longer output power to the signal input pin 3 of the voltage comparator A3. The voltage at the signal input pin 3 of the voltage comparator A3 will be zero or lower than 6V, and the output of the high level from pin 6 of the voltage comparator A3 will enter the positive power input of the alarm B2. The alarm B2 will be powered on and emit an audible and visual signal to alert the personnel in the duty room, indicating that the electric belt conveyor 5 is no longer in normal working condition.

[0021] Figure 1 , 2As shown in Figure 3, in this new type of electric belt conveyor 5, when the conveyor belt 53 at the upper end of the electric belt conveyor 5 is working normally, the gravity of the conveyor belt 53 at the upper end will be transmitted to the movable block 42 through the rotating drum. When the coal flow on the conveyor belt is relatively large (the number of coal blocks being conveyed is relatively large), the spring 43 is compressed relatively tightly, and the pressure acting on the force surface of the pressure sensor A4 is relatively amplified. The voltage signal output by pin 3 of the pressure sensor A4 is relatively high. Conversely, the voltage signal output by pin 3 of the pressure sensor A4 is relatively low (although the spring can absorb some pressure after compression, the pressure acting on the force surface of the pressure sensor will still increase due to its lower height). When the flow rate of coal conveyed by the electric belt conveyor 5 is relatively large, the voltage signal output from pin 3 of the pressure sensor A4 enters the other end of the adjustable resistor RP1. After the voltage signal is divided by the adjustable resistor RP1 and the resistor R1, it enters the signal input pin 3 of the voltage comparator A2. At this time, the voltage is about 6.1V, which is greater than the internal threshold voltage of the voltage comparator A2 (e.g., 6V). There is no output from pin 6 of the voltage comparator A2, and the alarm B1 will not be powered on to emit an audible and visual signal, indicating that the electric belt conveyor 5 is in a normal coal flow working state. When the coal flow rate on the electric belt conveyor is relatively low (the number of coal blocks being conveyed is relatively small), the spring 43 is compressed relatively loosely, and the pressure acting on the force surface of the pressure sensor A4 is relatively reduced. The voltage signal output from pin 3 of the pressure sensor A4 is relatively low. After the voltage signal output from pin 3 of the pressure sensor A4 enters the other end of the adjustable resistor RP1, the voltage signal is divided by the adjustable resistor RP1 and the resistor R1 and enters the signal input pin 3 of the voltage comparator A2. When the voltage at the signal input pin 3 of the voltage comparator A2 is zero or lower than 6V, the high level output from pin 6 of the voltage comparator A2 enters the positive power input terminal of the alarm B1. The alarm B1 will be powered on and emit an audible and visual signal to alert the personnel in the duty room, indicating that the coal flow rate conveyed by the electric belt conveyor 5 is relatively low.

[0022] Figure 1 , 2 As shown in Figure 3, through the above-mentioned application of this new type of collaborative electric belt conveyor, when the electric belt conveyor stops working, the second-channel audible and visual alarm can alert the management personnel; when the output flow of the electric belt conveyor in coal mines is relatively small, the first-channel audible and visual alarm can alert the management personnel, and the personnel in the management office can promptly go to the site to check the specific situation and take corresponding measures, thus ensuring production as much as possible and improving work efficiency accordingly. Figure 3As shown, power module A1 is a finished AC 220V to DC 12V power module; adjustable resistors RP1 and RP2 are 47K adjustable resistors (adjustable to 5.5K and 11.3K respectively); resistors R1 and R2 have resistances of 320Ω and 700Ω respectively; audible and visual alarms B1 and B2 are small LTE-5060 audible and visual alarms (the light-emitting surface is located outside the opening at the front of the component box), and their light colors are different to facilitate management personnel in roughly distinguishing whether the problem is a fault in the electric belt conveyor or insufficient coal flow; capacitor C is a 470UF / 25V electrolytic capacitor (for filtering); bridge rectifier A5 is model DB107S; pressure sensor A4 is a small HZC-H1 weighing sensor with two power input terminals and one signal output terminal. The greater the weight of the detected object, the higher the voltage signal output at the signal output terminal, and vice versa; voltage comparison... Units A2 and A3 are finished voltage comparators of model LM393N. They have two power input terminals, pins 4 and 5 (pin 5 is grounded), two signal input terminals, pins 3 and 1 (pin 1 is grounded), a ground terminal, pin 2, a control power input terminal, pin 7, a normally closed power output terminal, pin 8 (floating in this embodiment), and a normally open power output terminal, pin 6. The voltage comparators have threshold adjustment resistors. In specific production applications, pins 3 and 1 are connected to an external adjustable DC power supply, and the output of the adjustable DC power supply is adjusted to 6V (the two probes of the voltmeter are in contact with pins 3 and 1 for easy reading). Then, the adjustable resistors of voltage comparators A2 and A3 are adjusted until the relays of voltage comparators A2 and A3 are energized and engaged. Then, the adjustable resistors are adjusted in the reverse direction to be larger. In subsequent practical applications, when the input voltage is less than 6V, the relay will close, and the normally open contact pin 6 will output power. Generator M is a 12V small AC generator.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0024] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A coal flow monitoring device for mines, comprising an audible and visual alarm, a housing, and a voltage comparator, characterized in that, It also includes a rotation detection mechanism, a flow detection mechanism, and a detection circuit; the detection circuit, the audible and visual alarm, and the voltage comparator each have at least two paths; the rotation detection mechanism includes a rotating drum, a generator, and a connecting shaft, with both ends of the connecting shaft rotatably mounted inside the rotating drum, the stator coil of the generator fixedly mounted on the outer end of the connecting shaft, and the magnet ring of the generator fixedly mounted on the inner end of the rotating drum; the flow detection mechanism includes a guide cylinder, a movable block, a spring, a pressure sensor, a support plate, and a fixed base, with the lower end of the guide cylinder fixedly mounted on the upper end of the support plate, the pressure sensor fixedly mounted inside the lower end of the guide cylinder with its force-bearing surface located at the upper part, and the spring and the movable block movably sleeved inside the guide cylinder; the upper end of the guide cylinder has an opening, and a guide rod is fixedly mounted on the upper end of the movable block. The upper two sides of the fixed base and the two outer ends of the connecting shaft are fixedly installed together, and the lower end of the fixed base and the upper end of the guide rod are fixedly installed together. The voltage comparator and detection circuit are installed in the electrical control box, and the two audible and visual alarms are installed in the monitoring room. The lower end of the support plate is installed on the upper end of the frame of the electric belt conveyor, and the upper end of the guide cylinder is in contact with the lower side of the upper end of the conveyor belt of the electric belt conveyor. The signal output terminal of the pressure sensor, the power output terminal of the generator and the signal input terminal of the two detection circuits are electrically connected respectively. The signal output terminals of the two detection circuits and the signal input terminals of the two voltage comparators are electrically connected respectively. The power output terminals of the two voltage comparators and the power input terminals of the two audible and visual alarms are electrically connected respectively.

2. The coal flow monitoring device for mines according to claim 1, characterized in that, The distance between the inner end of the magnet and the outer end of the stator coil.

3. The coal flow monitoring device for mines according to claim 1, characterized in that, The outer diameter of the movable block is smaller than the inner diameter of the guide cylinder.

4. The coal flow monitoring device for mines according to claim 1, characterized in that, The height of the spring is greater than the height inside the guide tube.

5. The coal flow monitoring device for mines according to claim 1, characterized in that, The distance between the lower inner end of the fixed seat and the lower end of the rotating drum.

6. The coal flow monitoring device for mines according to claim 1, characterized in that, The first detection circuit includes an adjustable resistor and a resistor that are electrically connected, with one end of the resistor and one end of the adjustable resistor connected together.

7. The coal flow monitoring device for mines according to claim 1, characterized in that, The second detection circuit includes an adjustable resistor, a resistor, a bridge rectifier, and a capacitor that are electrically connected. The positive power output terminal of the bridge rectifier is connected to the positive terminal of the capacitor and one end of the adjustable resistor. The negative power output terminal of the bridge rectifier is connected to the negative terminal of the capacitor and one end of the resistor. The other end of the adjustable resistor is connected to the other end of the resistor.

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