Intermittent online weighing densimeter for dense medium coal preparation plant

Abstract

The utility model belongs to the field of densimeters, and particularly relates to an intermittent online weighing densimeter for a dense medium coal preparation plant. The intermittent online weighing densimeter for the dense medium coal preparation plant comprises a constant-volume container, a weighing support and a first three-way pipe, the constant-volume container is arranged above the weighing support, a plurality of weighing sensors are evenly distributed between the constant-volume container and the weighing support, an opening is formed in the top of the constant-volume container, and the first three-way pipe is connected with the constant-volume container. One branch pipe of the first three-way pipe is communicated with the opening, the other two branch pipes of the first three-way pipe are a feeding pipe and a water inlet pipe respectively, and a discharging opening is formed in the center of the bottom of the constant-volume container. According to the utility model, a mode of combining intermittent on-line weighing and flushing is adopted, heavy medium suspension liquid is introduced into the constant-volume container, the constant-volume container is weighed through the weighing sensor after being fully filled, and then the density value is calculated. The whole process is safe and has high precision.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the density gauge field, especially is involved a kind of intermittent on-line weighing density gauge of dense medium coal preparation plant. BACKGROUND

[0002] The separation principle of coal preparation process of dense medium coal preparation plant is that the separation is realized in certain density of heavy medium suspension by using the density difference between clean coal and gangue.The density control of heavy medium suspension is very important,if the density is too high,product ash content is high,if the density is too low,product ash content is too low,part of product coal is lost in gangue.So,accurate detection and accurate adjustment are needed for heavy medium suspension in production process.At present,there are two ways for density detection of heavy medium suspension in coal preparation plant:one is to use nuclear radioactive density gauge,energy attenuation is different when using ray to penetrate different density materials,so as to realize the measurement of density;the other is to use differential pressure density gauge,as shown in the formula ΔP=ρgh,after the installation position of two pressure transmitters is determined,h can be determined,so as to obtain density value by dividing the measured differential pressure value by gravity acceleration and height. Figure 1

[0003] The detection accuracy of nuclear radioactive density gauge is high,once radiation accident occurs,the damage to people and the pollution to environment are serious and difficult to eliminate.The differential pressure density gauge needs stable liquid column to accurately measure pressure difference,but in actual production,due to the existence of turbulence,it is difficult to form stable liquid column,so the measurement value of differential pressure density gauge fluctuates greatly and it is difficult to accurately measure.

[0004] Therefore,how to make the density gauge safe and have high accuracy becomes a problem to be solved. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of intermittent on-line weighing density gauge of dense medium coal preparation plant to solve the problems in the prior art.

[0006] In order to realize the above-mentioned purpose,the utility model provides the following technical scheme:

[0007] According to one aspect of the utility model,an intermittent on-line weighing density gauge of dense medium coal preparation plant is provided,which comprises a constant volume container,a weighing support and a first tee pipe,the constant volume container is arranged above the weighing support,and a plurality of weighing sensors are uniformly distributed between the constant volume container and the weighing support,one end of the weighing sensor is fixed to the bottom of the constant volume container,and the other end is fixed to the top of the weighing support,

[0008] ​The top of the constant volume container is provided with an opening, one branch of the first three-way pipe is communicated with the opening, the other two branches of the first three-way pipe are respectively a feeding pipe and a water feeding pipe, a discharge port is arranged at the center of the bottom of the constant volume container, and a discharge pipe is connected to the discharge port.

[0009] Further, the weighing sensor is installed on the weighing support.

[0010] Further, the feeding pipe is provided with a feeding electromagnetic valve, the water feeding pipe is provided with a water feeding electromagnetic valve, and the discharge pipe is provided with a discharge electromagnetic valve.

[0011] Further, the constant volume container is provided with an overflow pipe, one end of the overflow pipe is communicated with the top of the constant volume container, and the other end of the overflow pipe is communicated with the discharge pipe.

[0012] Further, the height of one side of the opening is higher than that of the other side, and the overflow pipe is arranged at the lower side of the opening.

[0013] Further, the overflow pipe is provided with a flow switch.

[0014] Further, the intermittent online weighing density meter of the dense medium coal preparation plant further comprises a second three-way pipe, one branch of the second three-way pipe is communicated with the overflow pipe, one branch of the second three-way pipe is communicated with the discharge pipe, and the other branch of the second three-way pipe is an output pipe.

[0015] Further, the discharge pipe and the overflow pipe respectively pass through the weighing support.

[0016] Further, the intermittent online weighing density meter of the dense medium coal preparation plant further comprises a control system, the control system comprises a single-chip microcomputer control module, a communication module, an upper computer module, a valve control module and a display module, the communication module, the valve control module and the display module are connected with the single-chip microcomputer control module, the upper computer module is connected with the communication module, the single-chip microcomputer control module is used for collecting the flow signals of the feeding pipe and the water feeding pipe and the weighing signals of the weighing sensor, and the valve control module is used for controlling the opening / closure of the feeding pipe, the water feeding pipe and the discharge pipe.

[0017] The utility model has the advantages that: the utility model provides a heavy medium coal preparation plant intermittent on -line weighing density meter, in the coal preparation plant production, the density of heavy medium suspension presents linear variation, there is no density up and down frequent fluctuation situation. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will be briefly introduced the drawing needed to be used in the specific embodiment or prior art description, obviously, the drawing in the following description is some implementation of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 It is the structure schematic diagram of differential pressure density meter in prior art;

[0020] Figure 2 It is the structure schematic diagram of heavy medium coal preparation plant intermittent on -line weighing density meter in a typical embodiment of the utility model;

[0021] Figure 3 It is Figure 2 The control system schematic diagram in the embodiment;

[0022] The figure mark explanation: 1-constant volume container;2-weighing sensor;3-weighing support;4-feeding pipe;5-water inlet pipe;6-feeding electromagnetic valve;7-water inlet electromagnetic valve;8-bleeding electromagnetic valve;9-flow switch;10-overflow pipe;11-bleeding pipe;12-second three-way pipe. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be clearly and completely described in the following by combining with the embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment.Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0024] In the description of the utility model, it is understood that in the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] As shown in Figure 2 The utility model provides a heavy medium coal preparation plant intermittent on -line weighing density meter, including constant volume container 1, weighing support 3 and first three -way pipe, constant volume container 1 is arranged in the top of weighing support 3, and a plurality of weighing sensors are evenly distributed between constant volume container 1 and weighing support 3, one end of weighing sensor is fixed in the bottom of constant volume container 1, the other end is fixed in the top of weighing support 3, the top of constant volume container 1 is equipped with opening, one branch pipe of first three -way pipe is in communication with the opening, the other two branch pipes of first three -way pipe are feed pipe 4 and water inlet pipe 5 respectively, the bottom central place of constant volume container 1 is provided with discharge port, and discharge pipe 11 is connected at discharge port. The utility model adopts constant volume container 1, has certain capacity and weight, can reduce the container shaking caused by material impact when feeding, reduces the influence of weighing. One branch pipe of first three -way pipe extends into constant volume container 1, and a baffle is arranged at the opening of constant volume container 1, the baffle corresponds to the branch pipe of first three -way pipe extending into constant volume container 1, reduces the impact of material on the container when feeding, makes the washing water form annular scattering, and washes the inner wall of the container. In specific use, the pipe diameter of discharge pipe 11 is greater than the pipe diameter of feed pipe 4, which can quickly empty the material in constant volume container 1, and discharge electromagnetic valve 8 is normally open by default. In addition, an independent washing water pipe can also be used for cleaning the inner wall of the container.

[0026] In a typical embodiment, 4 weighing sensors are arranged below the constant volume container 1, and the 4 weighing sensors are mounted on the weighing support 3; the constant volume container 1 is provided with a first three-way pipe, and a feed electromagnetic valve 6 and a water flushing electromagnetic valve are arranged on the feed pipe 4 and the water inlet pipe 5 respectively.

[0027] Preferably, the weighing sensors are mounted on the weighing support 3.

[0028] Preferably, the feed electromagnetic valve 6 is arranged on the feed pipe 4; the water inlet electromagnetic valve 7 is arranged on the water inlet pipe 5; and the discharge electromagnetic valve 8 is arranged on the discharge pipe 11.

[0029] Preferably, the constant volume container 1 is provided with an overflow pipe 10, one end of which is connected to the top of the constant volume container 1 and the other end is connected to the discharge pipe 11.

[0030] Preferably, the height of one side of the opening is higher than that of the other side, and the overflow pipe 10 is disposed on the lower side of the opening.

[0031] Preferably, the overflow pipe 10 is equipped with a flow switch 9. In specific use, a flow meter can also be used to replace the flow switch 9 for material flow detection.

[0032] Preferably, the intermittent online weighing density meter for heavy media coal preparation plant further includes a second three-way pipe 12, one branch of which is connected to the overflow pipe 10, one branch is connected to the discharge pipe 11, and the other branch is an output pipe.

[0033] Preferably, the discharge pipe 11 and the overflow pipe 10 pass through the weighing bracket 3.

[0034] like Figure 3 As shown, the intermittent online weighing density meter in the heavy media coal preparation plant also includes a control system. The control system comprises a microcontroller control module, a communication module, a host computer module, a valve control module, and a display module. The communication module, valve control module, and display module are respectively connected to the microcontroller control module. The host computer module is connected to the communication module. The microcontroller control module is used to collect flow signals from the feed pipe 4 and water inlet pipe 5, as well as weighing signals from the weighing sensor. The valve control module is used to control the opening / closing of the feed pipe 4, water inlet pipe 5, and discharge pipe 11. In practical use, a closed enclosure can be set up, with a control panel installed on it. This control panel inputs information to the microcontroller control module, including at least one of the following: weighing interval time, gross weight zeroing, displayed measurement value, and query historical records.

[0035] Based on the above solutions, different types of valves, such as electro-pneumatic valves and electric valves, can be used to replace solenoid valves to control material flow, all of which are within the scope of protection of this application.

[0036] The working principle of this utility model is as follows:

[0037] The discharge solenoid valve 8 is normally open. When the weighing operation starts, the discharge solenoid valve 8 is closed first, and the feed solenoid valve 6 is opened. The constant volume container 1 is fed with material. After the material is full, it is discharged from the overflow pipe 10. After the flow switch 9 on the overflow pipe 10 detects the material flow, it sends a signal to close the feed solenoid valve 6.

[0038] After the feeding electromagnetic valve 6 is closed, the weighing sensor gives weight data, and then the density value is obtained according to the volume; after the weighing is completed, the discharging electromagnetic valve 8 on the discharging pipe 11 is opened to empty the material in the constant volume container 1, and the water feeding electromagnetic valve 7 on the feeding pipe 4 is opened to flush the inner wall of the constant volume container 1. The diameter of the discharging pipe 11 is larger than that of the feeding pipe 4, and through calculation, the material emptying time is less than 10s, and when the emptying time is 10s, the water feeding electromagnetic valve 7 is closed to perform the whole weighing work process. The time for completing one weighing work process is ≦30s, that is, the density value reading is completed every 30s. It fully meets the requirement of the density measurement of the dense medium suspension in the coal preparation plant. The density reading interval time can be set. It should be noted that: according to the formula ρ=m / V, the V value is the net volume of the constant volume container 1, and the m value is the net weight of the material in the constant volume container 1. The V value is calibrated after the container is processed, and m=mtotal-mgross. The m value will change due to wear during the use of the container, and the m value can be cleared at intervals to avoid the influence on the weighing result.

[0039] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A batch on-line weigh-ometer for dense medium coal preparation plants characterised in that: The constant volume container is arranged above the weighing support, and a plurality of weighing sensors are uniformly distributed between the constant volume container and the weighing support, one end of the weighing sensor is fixed to the bottom of the constant volume container, and the other end is fixed to the top of the weighing support, The top of the constant volume container is provided with an opening, one branch of the first three-way pipe communicates with the opening, the other two branches of the first three-way pipe are respectively a feeding pipe and a water inlet pipe, a discharge port is formed in the center of the bottom of the constant volume container, and a discharge pipe is connected to the discharge port.

2. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 1, characterized in that: The weighing sensor is mounted on the weighing support.

3. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 1, characterized in that: The feeding pipe is provided with a feeding electromagnetic valve.

4. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 1, characterized in that: The water inlet pipe is provided with a water inlet electromagnetic valve, and the discharge pipe is provided with a discharge electromagnetic valve.

5. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 1, characterized in that: The constant volume container is provided with an overflow pipe, one end of the overflow pipe communicates with the top of the constant volume container, and the other end of the overflow pipe communicates with the discharge pipe.

6. The batch on-line weighing density meter for dense medium coal preparation plant according to claim 5, characterized in that: The height of one side of the opening is higher than that of the other side, and the overflow pipe is arranged at the lower side of the opening.

7. The batch on-line weighing density meter for dense medium coal preparation plant according to claim 5, characterized in that: The overflow pipe is provided with a flow switch.

8. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 5, characterized in that: The second three-way pipe is also provided, one branch of the second three-way pipe communicates with the overflow pipe, one branch communicates with the discharge pipe, and the other branch is an output pipe.

9. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 5, characterized in that: The discharge pipe and the overflow pipe respectively pass through the weighing support.

10. The batch on-line weighing densitometer for dense medium coal preparation plant according to claim 1, characterized in that: The control system includes a single-chip microcomputer control module, a communication module, an upper computer module, a valve control module and a display module, the communication module, the valve control module and the display module are connected with the single-chip microcomputer control module, the upper computer module is connected with the communication module, the single-chip microcomputer control module is used for collecting the flow signals of the feeding pipe and the water inlet pipe and the weighing signals of the weighing sensor, and the valve control module is used for controlling the opening / closure of the feeding pipe, the water inlet pipe and the discharge pipe.

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