Blockage detection device for chute below sculping screen

Abstract

The utility model relates to a device for detecting the blockage of a lower chute of a sculpture screen, which comprises a detection device body, the detection device body is arranged in the lower chute arranged below the sculpture screen and consists of an inclination sensor and a housing, the inclination sensor is arranged in the housing, a through hole is arranged at the top of the housing, and the through hole is communicated with the detection device body. A cable or a wireless device is installed in the through hole, the cable or the wireless device is connected with an external PLC control system, and the PLC control system is connected with a factory control computer for real-time monitoring. The utility model solves the problems that the operation space of the chute under the vibrating screen is relatively narrow, the processing difficulty is high and the delay time is long when the chute is blocked, simultaneously greatly reduces the labor intensity of field operators, and has good popularization value in the aspect of blockage prevention under the screen of a coal preparation plant.

Description

Technical Field

[0001] The utility model belongs to the technical field of blockage detection devices and relates to a blockage detection device for a chute under a media stripping screen. Background Art

[0002] The chute is an important link in the connection between equipment and equipment in a coal preparation plant. It plays a vital role in the transportation and transfer of coal. The normal "flow" of the coal flow in it is directly related to the stability of the entire production system. During the transportation of coal flow in the chute, fine coal is easy to accumulate on the inner wall of the chute. This accumulation trend often worsens and develops, and eventually leads to a blockage accident in a certain area of ​​the chute, which has an adverse effect on normal production. The existing under-screen chute detection device uses a membrane level switch to open a hole in the side wall of the chute. When the blind plate and screen plate of the de-mediating screen fall off, the fallen coal blocks block the under-screen chute, and the coal slurry accumulates in the chute. The liquid level rises and squeezes the side wall of the chute to generate static pressure. After the membrane level switch detects the change in static pressure, the internal dry contact outputs a conduction signal. At the same time, due to the blockage of the chute, it takes a long time to manually clean the chute, which also increases the labor intensity of the post workers.

[0003] In addition, the coal slime water under the de-screen contains a large amount of magnetite powder medium, the side walls of the chute under the screen are covered with wear-resistant cast stone, and the measuring surface of the membrane level switch has only one layer of stainless steel film. The membrane level switch will be frequently damaged if the coal blocks or coal slime water mixture under the screen flushes it for a long time.

[0004] Therefore, a device for detecting blockage of the chute under the media removal screen is designed to overcome the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a simple structure, practical and convenient, reduce the workload of on-site workers cleaning the chute under the screen, can realize automatic alarm, and effectively avoid the further expansion of accidents caused by untimely detection. The utility model of the chute blockage detection device for the chute under the media screen solves the problem that the existing detection device is not sensitive and has been damaged. When the chute is blocked, the blockage is accurately detected and an alarm signal is issued.

[0006] The utility model is realized through the following technical scheme: a device for detecting blockage of a chute under a media stripping screen, comprising a detection device body, the detection device body being installed in a lower chute opened below the media stripping screen, and being composed of a tilt sensor and a cover shell, wherein the tilt sensor is installed in the cover shell, a through hole is opened on the top of the cover shell, a cable or a wireless device is installed in the through hole, the cable or the wireless device is connected to an external PLC control system, and the PLC control system is connected to a plant control computer for real-time monitoring.

[0007] Preferably, the tilt sensor consists of a tilt sensor housing, a control signal cable, and measuring components, wherein the measuring components are arranged at the bottom of the tilt sensor housing, the bottom end of the control signal cable is inserted into the tilt sensor housing and connected to the measuring components at the bottom, and the top end of the control signal cable is connected to an external PLC control system via a through hole opened at the top of the cover.

[0008] Preferably, the tilt sensor housing is made of cylindrical stainless steel, is hollow inside, and is provided with an inverted U-shaped or hook-shaped connecting portion on the top, which is suspended in the housing by a rope.

[0009] Preferably, the cover shell has a truncated cone structure, with a mounting plate provided on the top of the truncated cone and an open bottom, wherein the top diameter is smaller than the bottom diameter, forming an internal space which is narrow at the top and wide at the bottom, and wrapping the tilt sensor therein; a through hole for the cable to pass through is provided on the mounting plate, and a plurality of mounting holes are provided on both sides of the through hole; ropes are installed in some of the mounting holes, and the ropes are hooked on the connecting part to suspend the tilt sensor inside the cover shell, and the remaining mounting holes fix the cover shell in the lower chute through mounting parts.

[0010] Preferably, the cover shell has a top diameter of 15 mm, a bottom diameter of 200 mm, a height of 100 mm, a surface polished and smooth, and a vertically downward surrounding edge is provided near the bottom edge.

[0011] Preferably, a plurality of vertically arranged reinforcing ribs are welded equidistantly on the inner surface of the cover shell.

[0012] The beneficial effects of the utility model are as follows:

[0013] The device for detecting blockage of the chute under the de-mediating screen designed by the utility model has a very obvious application effect. It can accurately detect the blockage of the chute under the de-mediating screen, reduce the workload of on-site workers in cleaning the chute under the screen, and can also timely and proactively protect and shut down the machine when the chute under the screen is blocked. It can realize automatic alarm and trigger the interlocking and stopping of upstream equipment, which can effectively avoid further expansion of accidents due to untimely detection. The device for detecting blockage of the chute under the de-mediating screen solves the problem that the working space of the chute under the vibrating screen is relatively small, and the handling is difficult and the delay time is long when the chute is blocked. At the same time, it greatly reduces the labor intensity of on-site operators and has a good promotion value in preventing blockage under the screen in coal preparation plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the structure of the cover and the tilt sensor of the utility model.

[0016] Figure 3 Schematic diagram of the internal structure of the tilt sensor. DETAILED DESCRIPTION

[0017] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0019] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1 As shown, a device for detecting blockage of a chute under a de-mediating screen comprises a detection device body 1, wherein the detection device body 1 is installed in a lower chute 3 opened below a de-mediating screen 2, and consists of a tilt sensor 4 and a cover 5, wherein the tilt sensor 4 is installed in the cover 5, a through hole 6 is opened on the top of the cover 5, a cable or a wireless device is installed in the through hole 6, and the cable or the wireless device is connected to an external PLC control system 8, and the PLC control system 8 is connected to a plant control computer 9 for real-time monitoring.

[0020] like Figure 2-3 As shown, the tilt sensor 4 is composed of a tilt sensor housing 10, a control signal cable 11, and a measuring component 12, wherein the measuring component 12 is arranged at the bottom of the tilt sensor housing 10, the bottom end of the control signal cable 11 is inserted into the tilt sensor housing 10 and connected to the measuring component 12 at the bottom, and the top end of the control signal cable 11 is connected to the external PLC control system 8 through a through hole 6 opened at the top of the cover 5. The tilt sensor is a mercury electric contact sensor.

[0021] The tilt sensor housing 10 is made of cylindrical stainless steel and is hollow inside. An inverted U-shaped or hook-shaped connecting portion 13 is provided on the top. The connecting portion 13 is suspended in the housing 5 via a rope 14 .

[0022] The cover shell 5 is in a truncated cone structure, with a mounting plate 15 disposed on the top of the truncated cone and an open bottom. The top diameter is smaller than the bottom diameter, forming an internal space that is narrow at the top and wide at the bottom, and wraps the tilt sensor 4 therein. A through hole 6 for the cable to pass through is provided on the mounting plate 15, and a plurality of mounting holes 16 are provided on both sides of the through hole 6. Ropes 14 are installed in some of the mounting holes 16, and the ropes 14 are hooked on the connecting portion 13 to suspend the tilt sensor 4 inside the cover shell 5. The remaining mounting holes 16 fix the cover shell 5 in the lower chute 3 through the mounting member 7.

[0023] The cover shell 5 has a top diameter of 15 mm, a bottom diameter of 200 mm, and a height of 100 mm. Its surface is polished and smooth, and a vertically downward surrounding edge 18 is provided near the bottom edge. A plurality of vertically arranged reinforcing ribs (not shown in the figure) are welded equidistantly on the inner surface of the cover shell 5.

[0024] In order to prevent the blockage detection device of the chute under the de-mediating screen from being eroded and worn by the coal slime water above for a long time during use, a conical protective cover (cover) is designed above the tilt sensor to protect the tilt sensor without affecting the measurement sensitivity of the tilt sensor.

[0025] The working principle of the utility model is as follows:

[0026] When the vertically suspended tilt sensor is subjected to external force and deviates from the vertical position by more than 15 degrees, the mercury contacts inside the sensor will move and the normally closed contacts will open. When the external force is removed, the tilt sensor returns to the vertical state and the mercury contacts close again. The changes in the opening and closing of the contacts in the tilt sensor are used to determine whether there is coal accumulation in the chute and to detect whether the chute under the stripping screen is blocked. When the chute under the stripping screen is blocked, the control signal is transmitted to the control system in the plant, and the control system implements an alarm to notify the personnel to take timely measures to avoid the expansion of the accident and reduce the impact on the production system.

[0027] The utility model can well solve the problem that the existing detection device is insensitive and damaged. When the chute is blocked, the blockage is accurately detected and an alarm signal is issued. After the blind plate and screen plate of the de-mediating screen fall off and cause the chute to be blocked, the coal blocks and coal slime water on the screen will gradually spread from the bottom of the chute to the top of the chute, causing the system to be unable to produce. If the chute blockage is to be accurately detected, it is necessary to install a sensing device inside the chute under the de-mediating screen, and connect its signal to the plant control system, so that once the chute under the de-mediating screen is blocked, an alarm can be displayed in the main control room, and the management personnel can arrange the personnel on duty to clear the chute.

[0028] The utility model adopts a reliable and easy-to-maintain tilt sensor as a detection device for preventing the chute under the de-mediating screen from being blocked. The tilt sensor is installed inside the chute. When coal blocks and coal slime water spread to the installation position, the tilt sensor senses a signal and immediately generates an alarm signal.

[0029] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for detecting blockage of a chute under a media removal screen, comprising a detection device body, characterized in that: The detection device body is installed in the lower chute opened below the de-mediating screen, and consists of a tilt sensor and a cover shell, wherein the tilt sensor is installed in the cover shell, a through hole is opened on the top of the cover shell, and a cable or wireless device is installed in the through hole. The cable or wireless device is connected to an external PLC control system, and the PLC control system is connected to a plant control computer for real-time monitoring.

2. The device for detecting blockage of the chute under the de-mediating screen according to claim 1, characterized in that: The tilt sensor consists of a tilt sensor housing, a control signal cable, and measuring components, wherein the measuring components are arranged at the bottom of the tilt sensor housing, the bottom end of the control signal cable is inserted into the tilt sensor housing and connected to the measuring components at the bottom, and the top end of the control signal cable is connected to an external PLC control system through a through hole opened at the top of the cover.

3. The device for detecting blockage of the chute under the de-mediating screen according to claim 2, characterized in that: The tilt sensor housing is made of cylindrical stainless steel and is hollow inside. An inverted U-shaped or hook-shaped connecting portion is provided on the top thereof and the connecting portion is suspended in the housing through a rope.

4. The device for detecting blockage of the chute under the de-mediating screen according to claim 3 is characterized in that: The cover shell is in a truncated cone structure, with a mounting plate on the top of the truncated cone and an open bottom. The top diameter is smaller than the bottom diameter, forming an internal space that is narrow at the top and wide at the bottom, and the tilt sensor is wrapped therein. A through hole for the cable to pass through is provided on the mounting plate, and multiple mounting holes are provided on both sides of the through hole. Ropes are installed in some of the mounting holes, and the ropes are hooked on the connecting part to hang the tilt sensor inside the cover shell. The remaining mounting holes fix the cover shell in the lower chute through mounting parts.

5. The device for detecting blockage of the chute under the de-mediating screen according to claim 4, characterized in that: The top diameter of the cover shell is 15 mm, the bottom diameter is 200 mm, and the height is 100 mm. The surface is polished and smooth, and a vertical downward surrounding edge is opened near the bottom edge.

6. The device for detecting blockage of the chute under the de-mediating screen according to claim 5, characterized in that: A plurality of vertically arranged reinforcing ribs are welded equidistantly on the inner surface of the cover shell.

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