Alarm device for material blockage of cyclone

Abstract

The utility model relates to the technical field of whirlcone alarming, in particular to an alarming device for material blockage of a whirlcone. Comprising a pressure transmitter, a control instrument and an audible and visual alarm, a first indicator light, a second indicator light and an operation panel are arranged on the outer wall of the control instrument, a PLC, a first relay and a second relay are arranged in the control instrument, the pressure transmitter is connected with the input end of the PLC, and the operation panel is connected with the input end of the PLC. The input end of the first relay and the input end of the second relay are respectively connected with the output end of the PLC, and the output end of the first relay and the output end of the second relay are respectively connected with the first indicating lamp and the audible and visual alarm; the pressure transmitter is used for measuring the pressure in a first-section cyclone in the dense medium coal separation system; the pressure condition in the first-section cyclone can be reflected in time, waste caused by material blockage is avoided, and the problem that the precision of each coal is not high is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cyclone alarms, in particular to an alarm device for cyclone blockage. Background Art

[0002] The hydrocyclone is a common separation and classification equipment, which usually uses the principle of centrifugal sedimentation. When the two-phase mixed liquid to be separated enters the hydrocyclone tangentially from the periphery of the hydrocyclone at a certain pressure, a strong three-dimensional elliptical rotating shear turbulent motion is generated. Due to the particle size difference between coarse particles and fine particles, they are subjected to different centrifugal forces, centripetal buoyancy, fluid drag, etc. Under the action of centrifugal sedimentation, most of the coarse particles are discharged through the bottom flow port of the hydrocyclone, and most of the fine particles are discharged from the overflow pipe, thereby achieving the purpose of separation and classification. The hydrocyclone is also used in heavy medium coal preparation to separate clean coal, medium coal and gangue.

[0003] In the existing heavy medium coal preparation, the qualified medium pump needs to maintain a certain pressure to pump the qualified medium liquid from the qualified medium barrel into the cyclone. The medium liquid will enter the cyclone along the tangential direction of the cyclone. The medium liquid will rotate on the inner cavity wall surface of the cyclone and form a cavity in the middle of the cyclone. The washed coal enters the cyclone from the center of the cyclone. A pressure gauge or pressure transmitter is installed near the pipeline where the liquid enters the cyclone. The pressure gauge or pressure transmitter transmits the pressure signal back to the control console through a shielded cable. The operator monitors the pressure and density adjustment on the control console.

[0004] The following problems may occur when the cyclone is blocked: (1) the system may be disrupted and the clean coal, medium coal and gangue may not be separated normally, resulting in waste; (2) the pressure at the inlet of the cyclone may be reduced, and the qualified medium liquid may not flow along the outer wall of the cyclone. The raw coal may flow out of the clean coal outlet under the action of the medium liquid, resulting in serious substandard quality of the clean coal; (3) the next cyclone may be blocked, resulting in system pollution, and the clean coal may contain gangue and medium coal; (4) the normal production washing volume may be affected.

[0005] Since cyclone blockage can lead to the above problems, monitoring of cyclone blockage has become a highly valued issue. However, current cyclone pressure monitoring mainly relies on manpower, which may not be able to detect cyclone blockage in time, resulting in waste and low accuracy of the separated coals.

[0006] Therefore, there is an urgent need to provide an alarm device for cyclone blockage, which can replace the manual monitoring of the cyclone and avoid waste in the heavy medium coal preparation process compared with the existing technology. Utility Model Content

[0007] The utility model solves the technical problems existing in the prior art and provides an alarm device for cyclone blockage.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0009] An alarm device for cyclone blockage comprises a pressure transmitter, a control instrument and an audible and visual alarm. The outer wall of the control instrument is provided with a first indicator light, a second indicator light and an operation panel. A PLC controller, a first relay and a second relay are provided inside the control instrument. The pressure transmitter is connected to an input end of the PLC controller, the operation panel is connected to an input end of the PLC controller, the input end of the first relay and the input end of the second relay are respectively connected to an output end of the PLC controller, the output end of the first relay is respectively connected to the first indicator light and the audible and visual alarm, and the output end of the second relay is respectively connected to the second indicator light and the audible and visual alarm. The pressure transmitter is used to measure the pressure inside a first-stage cyclone in a heavy medium coal preparation system.

[0010] Furthermore, the control instrument is also provided with a first display screen, which is connected to an output terminal of the PLC controller, and is used to display the pressure value measured by the pressure transmitter.

[0011] Furthermore, the control instrument is also provided with a second display screen, which is connected to an output terminal of the PLC controller, and is used to display numbers input into the PLC controller through the operation panel.

[0012] Furthermore, a third relay is provided inside the control instrument, and the heavy medium coal preparation system is also provided with a second-stage cyclone connected to the first-stage cyclone. The input end of the third relay is connected to the PLC controller, and the output end of the third relay is connected to the power supply for controlling the first-stage cyclone and the power supply for controlling the second-stage cyclone.

[0013] Furthermore, the third relay uses RS485 communication for output.

[0014] Furthermore, the pressure transmitter outputs a 4-20mA signal.

[0015] Furthermore, the sound and light alarm includes a base and a main body, the main body is connected to the upper part of the base, and one end of the main body away from the base is set to be transparent.

[0016] Furthermore, a sound generator and a light generator are provided inside the sound and light alarm, the sound generator is connected to the first relay and the second relay respectively, and the light generator is connected to the first relay and the second relay respectively.

[0017] Furthermore, the first stage cyclone is provided with a clean coal discharge port, the pressure transmitter is installed on the first stage cyclone, and the pressure transmitter is installed close to the clean coal discharge port.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The utility model uses a pressure transmitter to measure the pressure value in a first-stage cyclone. When the pressure is too high or too low, the sound and light alarm will remind the staff and perform the interlocking function at the same time, so that the first-stage cyclone and the second-stage cyclone are stopped, replacing the manual monitoring of the pressure display. It can timely reflect the pressure situation in the first-stage cyclone, and timely discover and stop the cyclone when it is blocked, avoiding waste caused by blockage and avoiding the problem of low accuracy of each coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the connection relationship between the first-stage cyclone and the second-stage cyclone of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the control instrument of the utility model.

[0022] Figure 3 It is a structural schematic diagram of the sound and light alarm of the utility model.

[0023] Figure 4 It is a flow chart of the modules in the utility model.

[0024] Description of reference numerals:

[0025] 1. First-stage cyclone; 2. Raw coal inlet; 3. Clean coal outlet; 4. Pressure transmitter; 5. Medium gangue outlet; 6. Second-stage cyclone; 7. Medium coal outlet; 8. Gangue outlet; 9. Control instrument; 91. First display screen; 92. Second display screen; 93. First indicator light; 94. Second indicator light; 95. Operation panel; 10. Sound and light alarm; 11. Base; 12. Main body. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] like Figure 1 As shown, the heavy medium coal preparation system includes a first-stage cyclone 1 and a second-stage cyclone 6. The first-stage cyclone 1 is provided with a raw coal inlet 2, a clean coal outlet 3 and a medium gangue outlet 5. The second-stage cyclone 6 is provided with a medium coal outlet 7 and a gangue outlet 8. The first-stage cyclone 1 is connected to the second-stage cyclone 6 through the medium gangue outlet 5.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides an alarm device for cyclone blockage, including a pressure transmitter 4, a control instrument 9 and an audible and visual alarm 10. The pressure transmitter 4 is installed on a first-stage cyclone 1. The pressure transmitter 4 is arranged close to the clean coal discharge port 3. The pressure transmitter 4 is electrically connected to the control instrument 9. The control instrument 9 is electrically connected to the audible and visual alarm 10. The control instrument 9 is also electrically connected to the power supplies of the first-stage cyclone 1 and the second-stage cyclone 6.

[0029] like Figure 2 As shown, the control instrument 9 is provided with a first display screen 91 , a second display screen 92 , a first indicator light 93 , a second indicator light 94 and an operation panel 95 .

[0030] like Figure 3 As shown, the sound and light alarm 10 includes a base 11 and a main body 12 , and the upper wall of the base 11 is connected to the main body 12 .

[0031] like Figure 4 As shown, a PLC controller, a first relay and a second relay are provided inside the control instrument 9. The PLC controller is provided with a plurality of input terminals and output terminals. The pressure transmitter 4 is connected to an input terminal of the PLC controller. The pressure transmitter 4 transmits the measured pressure signal to the PLC controller. An output terminal of the PLC controller is electrically connected to a first display screen 91. The PLC controller performs digital-to-analog conversion on the received pressure signal and displays the pressure value on the first display screen 91. The first display screen 91 displays the pressure value inside a section of the cyclone 1 measured by the pressure transmitter 4 in real time.

[0032] The sound and light alarm 10 is provided with a sound and light alarm and a light generator. An input end of the PLC controller is electrically connected to the operation panel 95, and the staff inputs the first threshold value and the second threshold value through the operation panel 95. The input end of the first relay and the input end of the second relay are electrically connected to an output end of the PLC controller respectively. The output end of the first relay is electrically connected to the first indicator light 93, the sound generator, and the light generator respectively, and the output end of the second relay is electrically connected to the second indicator light 94, the sound generator, and the light generator respectively; the PLC controller compares the pressure signal input by the pressure transmitter 4 with the first threshold value and the second threshold value respectively. When the pressure signal is less than or equal to the first threshold value, the PLC controller controls the first relay to open, and the first relay controls the first indicator light 93, the light generator to emit light, and controls the sound generator to emit sound. When the pressure signal is greater than or equal to the second threshold value, the PLC controller controls the second relay to open. After the first relay is opened, it controls the second indicator light 94, the light generator to emit light, and controls the sound generator to emit sound. When the Shenguan alarm makes a sound and emits light, the staff judges whether the pressure in a section of the cyclone 1 is too high or too low by observing the lighting conditions of the first indicator light 93 and the second indicator light 94 on the control instrument 9. The lighting of the first indicator light 93 indicates that the pressure in a section of the cyclone 1 is less than or equal to the first threshold value, and the lighting of the second indicator light 94 indicates that the pressure in a section of the cyclone 1 is greater than or equal to the second threshold value.

[0033] One output end of the PLC controller is also connected to the second display screen 92 . The PLC controller converts the first threshold value and the second threshold value input on the operation panel 95 , and displays the first threshold value and the second threshold value on the second display screen 92 .

[0034] One output end of the PLC controller is also connected to the third relay. When the PLC sends a signal to open the first relay or the second relay, it also sends a signal to open the third relay. The third relay opens after receiving the opening signal sent by the PLC controller. After the third relay opens, it controls the power supply of the first-stage cyclone 1 and the second-stage cyclone 6 to be turned off at the same time.

[0035] The first threshold is greater than the second threshold, and the first threshold is 0.24 MPa; the pressure transmitter 4 uses 4-20mA signal output, and the third relay uses RS485 communication for output.

[0036] The upper end of the main body 12 of the sound and light alarm 10 is transparent, and the light emitted by the light generator is emitted through the transparent portion of the upper end of the main body 12 .

[0037] By means of the alarm device for cyclone blockage provided by the utility model, the pressure value in the first stage cyclone 1 is measured by the pressure transmitter 4. When the pressure value is less than or equal to the first threshold value, the first indicator light 93 lights up and the sound and light alarm 10 works. When the pressure value is greater than or equal to the second threshold value, the second indicator light 94 lights up and the sound and light alarm 10 works. When the pressure is too high or too low, the sound and light alarm 10 reminds the staff and performs the interlocking function at the same time to stop the first stage cyclone 1 and the second stage cyclone 6. Instead of manually watching the pressure display, the pressure situation in the first stage cyclone 1 can be reflected in time. When blockage occurs, the machine can be stopped in time to avoid waste caused by blockage and the problem of low accuracy of each coal.

[0038] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. An alarm device for cyclone blockage, characterized in that: It includes a pressure transmitter, a control instrument and an audible and visual alarm. The outer wall of the control instrument is provided with a first indicator light, a second indicator light and an operation panel. The control instrument is provided with a PLC controller, a first relay and a second relay inside. The pressure transmitter is connected to an input end of the PLC controller, the operation panel is connected to an input end of the PLC controller, the input end of the first relay and the input end of the second relay are respectively connected to an output end of the PLC controller, the output end of the first relay is respectively connected to the first indicator light and the audible and visual alarm, and the output end of the second relay is respectively connected to the second indicator light and the audible and visual alarm; the pressure transmitter is used to measure the pressure inside a first-stage cyclone in a heavy medium coal preparation system.

2. The alarm device for cyclone blockage according to claim 1, characterized in that: The control instrument is also provided with a first display screen, which is connected to an output end of the PLC controller and is used to display the pressure value measured by the pressure transmitter.

3. The alarm device for cyclone blockage according to claim 2, characterized in that: The control instrument is also provided with a second display screen, which is connected to an output terminal of the PLC controller, and is used to display numbers input into the PLC controller through the operation panel.

4. The alarm device for cyclone blockage according to claim 1, characterized in that: A third relay is also provided inside the control instrument, and the heavy medium coal preparation system is also provided with a second-stage cyclone connected to the first-stage cyclone. The input end of the third relay is connected to the PLC controller, and the output end of the third relay is connected to the power supply for controlling the first-stage cyclone and the power supply for controlling the second-stage cyclone.

5. The alarm device for cyclone blockage according to claim 4, characterized in that: The third relay uses RS485 communication for output.

6. The alarm device for cyclone blockage according to claim 1, characterized in that: The pressure transmitter outputs a 4-20mA signal.

7. The alarm device for cyclone blockage according to claim 1, characterized in that: The sound and light alarm comprises a base and a main body, wherein the main body is connected to the upper part of the base, and one end of the main body away from the base is set to be transparent.

8. The alarm device for cyclone blockage according to claim 7, characterized in that: The sound and light alarm is provided with a sound generator and a light generator inside. The sound generator is connected to the first relay and the second relay respectively, and the light generator is connected to the first relay and the second relay respectively.

9. The alarm device for cyclone blockage according to claim 1, characterized in that: The first stage cyclone is provided with a clean coal discharge port, and the pressure transmitter is installed on the first stage cyclone, and the pressure transmitter is installed close to the clean coal discharge port.

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