CN209109594U - A kind of de-mediated sieve plate falls off monitoring device - Google Patents

Abstract

It falls off monitoring device the utility model discloses a kind of de-mediated sieve plate, including foreign bodies detection case, sieve lower pipeline, detection module and control unit；Foreign bodies detection case is connect with sieve lower pipeline, and the bottom of foreign bodies detection case is provided with double-edged fine-toothed comb, the top setting detection cover plate of foreign bodies detection case；The detection module is arranged on foreign bodies detection case, and for detecting the position of detection cover plate, when the build up of material of foreign bodies detection case makes that detection cover plate is promoted to move to certain height, control unit exports alarm signal.The advantages that solving the problems, such as the hysteresis quality of artificial experience breakdown judge, having highlighted timeliness, the practicability of the device.

Description

A device for monitoring the shedding of sieve plates of de-intermediation sieves

technical field

The utility model relates to the technical field of mechanical failure detection in a coal preparation plant, in particular to a device for monitoring the falling off of a sieve plate of a de-intermediation sieve in a heavy medium coal preparation machine in a coal preparation plant.

Background technique

The failure of the sieve plate of the de-intermediation screen is one of the frequent failures of the de-intermediation screen in the daily production and operation. If the failure cannot be found in time after the second-layer sieve plate of the de-intermediation screen falls off, the large pieces of material on the screen will pass through the pipeline under the screen. Entering the medium system will cause the pipeline under the sieve to be blocked, thereby causing the entire medium circulation system to be paralyzed and unable to produce normally.

At this stage, the de-intermediation sieves used in coal preparation plants are all polyurethane sieves with good wear resistance and hydrophobicity, and the polyurethane sieves are installed and fixed on the sieve machine by snap-fit installation with the gauge seat of the sieve machine. of. During the daily production and operation of the stripping screen, the wear of the polyurethane sieve plate and the gauge seat of the sieve machine will cause the sieve plate to become loose. If the sieve machine continues to operate, the sieve plate will fall off. A large amount of over-screen material enters the under-sieve chute and pipeline, resulting in production accidents such as mixing of bulk materials into the media system, blockage of the under-screen chute and under-screen pipeline.

The existing screen machine does not have any online detection and protection device for the failure of the sieve plate falling off. It can only be inspected and inspected by the experience and judgment of the on-site operators, and there is a serious lag, which will lead to problems such as the expansion of the failure.

In view of the existing technical problems, it is necessary to design an alarm device for the abnormal state of the material falling off the second-layer sieve plate of the sieve, so as to monitor the state of the sieve plate in real time.

Utility model content

In view of the problems existing in the prior art, the utility model provides a device for monitoring the abnormal state of the material under the sieve after the sieve plate of the de-intermediation sieve falls off, which solves the problem of online detection of the abnormal state of the material under the sieve after the sieve plate of the de-intermediation sieve has fallen off. Detection of blanks and human fault judgment hysteresis and other issues.

The utility model is realized through the following technical solutions:

A device for monitoring the falling off of a sieve plate of a de-intermediation sieve includes a foreign matter detection box, a pipeline under the sieve, a detection module and a control unit;

The foreign matter detection box is connected to the under-sieve pipeline, the materials in the under-sieve pipeline can be shunted to the foreign object detection box, and the bottom of the foreign object detection box is provided with a grate, which is used to divert the small materials from the under-sieve pipeline to the foreign object detection box. Outflow from the grate hole, and a detection box cover is set on the top of the foreign body detection box;

The detection module is arranged on the foreign object detection box and is used to detect the position of the cover plate of the detection box. The detection module is connected with the control unit. When the distance between the detection module and the cover plate of the detection box changes, the control unit outputs an alarm signal.

Preferably, one end of the detection box cover is rotatably connected with the foreign object detection box, and the detection module is arranged on the upper end of the side wall of the foreign object detection box.

Preferably, the free end of the detection box cover protrudes from the side wall of the foreign object detection box, and the detection module is arranged outside the side wall of the foreign object detection box for detecting the position of the free end of the detection box cover.

Preferably, the bottom of the detection box cover plate is further provided with a detection detection plate, and the detection detection plate is inclined, and the inclination direction is the same as the falling direction of the material.

Preferably, the detection probe has an L-shaped structure.

Preferably, the shortest distance from the lower end of the detection probe plate to the connection end of the detection box cover plate is smaller than the width of the foreign object detection box.

Preferably, the foreign matter detection box is communicated with the under-sieve pipeline through a shunt pipe, and the included angle between the shunt pipe and the under-sieve pipeline is an acute angle.

Preferably, a baffle is provided at the connection between the shunt pipe and the underscreen pipeline, which is used for shunting the material in the underscreen pipeline to the foreign matter detection box.

Preferably, the foreign object detection box is detachably connected to the grate.

Preferably, the detection module is a photoelectric switch.

Compared with the prior art, the utility model has the following beneficial technical effects:

The sieve plate shedding monitoring device of the de-intermediate sieve uses the sieve plate of the de-intermediation sieve machine to fall off, and the material under the sieve will contain a large amount of the material on the screen, and the material will be shunted to the foreign matter detection box. When the material in the foreign matter detection box accumulates to When the detection module detects a change in the distance from the detection box cover, the control unit outputs an alarm signal and the alarm alarms. The device fills the gap of the on-line detection and protection device for the sieve plate falling off of the sieve, solves the hysteresis problem of fault judgment by human experience, and highlights the advantages of timeliness and practicability of the device.

The detection box cover is rotatably connected with the foreign object detection box, and the detection module is arranged on the outside of the foreign object detection box, which is convenient to install, and at the same time avoids the impact of the material on the detection module and prolongs the service life.

The bottom of the detection box cover is equipped with a detection detection plate, which shortens the time for material accumulation and improves the timeliness of detection.

The distance from the detection probe to the connecting shaft is smaller than the width of the foreign object detection box, so as to ensure the normal opening and closing of the detection box cover.

Further, a deflector is set at the mouth of the shunt pipe to shunt the material to ensure that the material enters the cover plate of the detection box.

Description of drawings

FIG. 1 is a schematic structural diagram of a monitoring device of the present invention.

In the figure: 1. grate; 2. deflector; 3. detection probe; 4. foreign body detection box; 5. photoelectric switch; 6. detection box cover; 7. sieve pipeline; 8. shunt pipe.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings, which are to explain rather than limit the present utility model.

As shown in Figure 1, a device for monitoring the shedding of the sieve plate of the de-intermediation sieve includes a foreign body detection box 4, a shunt pipe 8, a sieve pipeline 7, a detection probe 3, a photoelectric switch 5, a control unit and an alarm.

Among them, the underscreen pipeline 7 is connected with the pipeline inlet of the under-sieve chute, and the foreign matter detection box 4 is communicated with the underscreen pipeline 7 through the shunt pipe 8, and the shunt pipe 8 is arranged obliquely. The included angle is 30°-60°. A deflector 2 is also provided at the connection between the shunt pipe 8 and the underscreen pipeline 7, and the width of the deflector 2 is a quarter of the diameter of the underscreen pipeline. 8. Weld the deflector at the intersection on the upper side; the deflector 2 is used for the normal material guide of the foreign body detection box, and it must also be able to meet the normal discharge of the sieve pipeline 7.

The foreign object detection box 4 has a rectangular structure. The top of the foreign object detection box 4 is provided with a detection box cover plate 6. One end of the detection box cover plate 6 is connected with the upper end of the foreign object detection box 4 through a rotating shaft, and the detection box cover plate 6 can be rotated around the rotating shaft to open. The foreign object detection box 4, the other end of the detection box cover 6 protrudes from the side wall of the foreign object detection box 4, and the photoelectric switch 5 is arranged on the upper end of the outer side wall of the foreign object detection box 4, and is located at the position where the detection box cover 6 extends out of the foreign object detection box. At the bottom of the part, the photoelectric switch 5 is used to detect the height position of the cover plate 6 of the detection box. The photoelectric switch 5 is connected with the control unit, and the control unit is connected with the alarm.

The detection probe plate 3 is arranged at the bottom of the detection box cover plate 6. The detection probe plate 3 has a "7" shape structure and is installed obliquely at the bottom of the detection box cover plate 6. The inclination direction of the lower end of the detection probe plate 3 is related to the material. The falling direction remains the same. The detection probe plate 3 is welded and installed on the detection box cover plate 6 according to the site conditions. The size of the detection probe plate should not only ensure the normal opening and closing of the detection box cover plate 6, but also ensure that the foreign object detection box 4 is sensitive to detect when foreign objects accumulate. reliability. The bottom of the foreign object detection box 4 is a detachable grate 1, small materials can leak out of the grate hole, and large materials are blocked on the grate 1.

The monitoring unit is a BR85-DL-VR3X/E diffuse reflection adjustable diffuse reflection photoelectric switch, and the control unit is a PLC module; the photoelectric switch is used to detect the abnormal state of the material under the sieve in the detection box, and return the detected fault signal to the PLC module , to perform the function of alarming and prompting the abnormal state of the material under the sieve.

When the photoelectric switch 7 is installed, the detection direction is required to be perpendicular to the detection box cover 6 when it is completely closed; when the material is stacked on the grate 1 in the detection box 4, the detection detection board 3 will be lifted up, and the foreign object detection box cover 6 will rotate clockwise. When the photoelectric switch 4 cannot detect the cover plate 6 of the detection box, the photoelectric switch 7 acts to send a return signal to the PLC module through RSLINK communication to the upper computer RSVIEW32 program.

The foreign object detection box 4 is a hollow cuboid box with a length of 620mm, a width of 315mm and a height of 500mm, which is welded by a steel plate with a thickness of 6mm. The grate hole of the disassembled grate 1 is 25mm long, and a detection box cover plate 6 with a rotating shaft is installed on the top of the foreign object detection box 4 to ensure that the foreign object detection box cover plate 6 rotates flexibly and reliably during installation, and the grate is easy to disassemble.

The working principle of a device for monitoring the falling off of a sieve plate of a de-intermediation sieve provided by the present invention will be described in detail below.

When the de-intermediation screen is in normal operation, the material under the sieve can normally pass through the under-sieve pipeline 7 and the foreign matter detection box 4 to discharge normally, and the photoelectric switch 5 normally detects the cover plate 6 of the foreign matter detection box. At this time, the de-intermediation screen is in a normal state. . When the sieve plate falls off, the material on the sieve will enter the pipeline under the sieve. At this time, when the accumulated material on the grate 1 in the foreign object detection box 4 accumulates to a certain height, the detection plate 3 will be lifted up, and the cover plate 6 of the foreign object detection box will be lifted up. Rotate clockwise, when the photoelectric switch 4 cannot detect the cover plate 6 of the detection box, the sensor action will send a return signal to the PLC, and the signal will be communicated to the host computer RSVIEW32 program through RSLINK. Alarm output.

The existing screen machine does not have any online detection and protection device for the failure of the sieve plate falling off. It can only be inspected and inspected by the experience and judgment of the on-site operators, and there is a serious lag, which will lead to problems such as the expansion of the failure. In the experimental device of the present invention, the material under the sieve will contain a large amount of the material on the screen after the failure of the sieve plate of the de-intermediate sieve machine occurs; by detecting the abnormal state of the material under the sieve, the de-intermediation device is designed and installed by using the detection principle of diffuse reflection photoelectric technology. The abnormal state detection device of the material under the sieve after the sieve plate falls off, effectively fills the gap of the online detection and protection device for the sieve plate falling off of the sieve plate, improves the hysteresis problem of fault judgment by human experience, and highlights the timeliness of the device. practicality, etc.

The above content is only to illustrate the technical idea of the present utility model, and cannot limit the protection scope of the present utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the present utility model fall into the scope of the present utility model. within the scope of protection of the claims.

Claims (10)

1. A device for monitoring the shedding of a sieve plate from an intermediary sieve is characterized in that, comprising a foreign body detection box (4), a pipeline under the sieve (7), a detection module and a control unit; Wherein, the foreign object detection box (4) is connected with the under-sieve pipeline (7), the material in the under-sieve pipeline (7) can be diverted to the foreign object detection box (4), and the bottom of the foreign object detection box (4) is provided with There is a grate (1), which is used to flow out the small materials shunted by the under-sieve pipeline from the grate hole, and a detection box cover (6) is arranged on the top of the foreign body detection box (4); The detection module is arranged on the foreign object detection box (4) and is used to detect the position of the detection box cover (6). The detection module is connected to the control unit. When the distance between the detection module and the detection box cover (6) changes, , the control unit outputs an alarm signal. 2. The device for monitoring the falling off of the sieve plate according to claim 1 is characterized in that, one end of the detection box cover plate (6) is rotatably connected with the foreign body detection box (4), and the detection module is arranged in the foreign body detection box (4). 4) The upper end of the side wall. 3. The device for monitoring the shedding of the sieve plate of the de-intermediation sieve according to claim 2, wherein the free end of the detection box cover plate (6) protrudes from the side wall of the foreign body detection box (4), and the detection module is arranged in the foreign body detection box. The outer side of the side wall of the box (4) is used for detecting the position of the free end of the box cover (6). 4. The device for monitoring the falling off of the sieve plate according to claim 2, characterized in that, the bottom of the detection box cover plate (6) is also provided with a detection detection plate (3), and the detection detection plate (3) Inclined setting, the inclined direction is the same as the falling direction of the material. 5 . The device for monitoring the falling off of a sieve plate of a de-intermediation sieve according to claim 4 , wherein the detection probe plate ( 3 ) is of an L-shaped structure. 6 . 6. The device for monitoring the falling off of the sieve plate according to claim 4, wherein the shortest distance from the lower end of the detection detection plate (3) to the connection end of the detection box cover plate (6) is less than that of the foreign body detection box (4) width. 7. The device for monitoring the detachment of the sieve plate from the sieve according to claim 1, characterized in that, the pipe under the sieve (7) is communicated with the side wall of the foreign body detection box (4) through the shunt pipe (8), and the The included angle between the shunt pipe (8) and the underscreen pipeline (7) is an acute angle. 8. The device for monitoring the shedding of the sieve plate of the de-intermediation sieve according to claim 7, characterized in that, a guide plate (2) is provided at the connection between the shunt pipe (8) and the under-sieve pipeline (7), which is used for The material in the under-sieve pipeline (7) is diverted to the foreign matter detection box (4). 9 . The device for monitoring the falling off of the sieve plate of the de-intermediation sieve according to claim 1 , wherein the foreign matter detection box ( 4 ) is detachably connected to the grate ( 1 ). 10 . 10 . The device for monitoring the shedding of a sieve plate of an intermediary sieve according to claim 1 , wherein the detection module is a photoelectric switch. 11 .