Device for automatically cleaning dangerous waste liquid spray gun

Abstract

A device for automatically cleaning a dangerous waste liquid spray gun belongs to the technical field of automatic cleaning. The device consists of a dangerous waste liquid pipeline, a tap water pipeline, a compressed air pipeline, a pressure transmitter, a three-way regulating valve, a dangerous waste liquid spray gun and a DCS (Distributed Control System), wherein the joints of all the parts are completely sealed; the pressure transmitter is arranged on the dangerous waste liquid pipeline, the dangerous waste liquid pipeline and the tap water pipeline are converged through the three-way regulating valve and then are converged with the compressed air pipeline, and the pressure transmitter, the three-way regulating valve and the DCS are interlocked; when the dangerous waste liquid pipeline does not input waste liquid into the dangerous waste liquid spray gun, the DCS controls the tap water pipeline to supply water through the three-way regulating valve, and the dangerous waste liquid spray gun is subjected to spray washing under pressurization of compressed air. The automatic cleaning device improves the automation level of a factory, does not need manual intervention, can clean the dangerous waste liquid spray gun, is good in cleaning effect and free of dangerous waste liquid residues, and saves manpower, material resources and production cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic cleaning, and in particular relates to a device for automatically cleaning a spray gun for hazardous waste liquid. Background Art

[0002] The hazardous waste liquid spray gun is a feeding device used to dispose of liquid hazardous waste. It uses compressed air as a power source to spray hazardous waste liquid into the incinerator in an atomized state. Hazardous waste liquids are usually highly corrosive and viscous. After the waste liquid spray gun is finished working, some hazardous waste liquids will remain in the pipeline and cannot be discharged. In the long run, it will cause the waste liquid spray gun body to corrode and the spray gun head to clog. Therefore, after the waste liquid spray gun finishes working, the waste liquid spray gun needs to be cleaned in time. At present, the staff is required to manually dismantle the spray gun device for cleaning after the hazardous waste liquid spray gun is finished working. The dismantling and cleaning process is complicated, the cleaning efficiency is low, and the cleaning is not thorough, which cannot fundamentally solve the problems of gun body corrosion and blockage. Utility Model Content

[0003] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to provide a device for automatically cleaning a spray gun for hazardous waste liquid.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A device for automatically cleaning a hazardous waste liquid spray gun comprises a hazardous waste liquid pipeline, a tap water pipeline, a compressed air pipeline, a pressure transmitter, a three-way regulating valve, a hazardous waste liquid spray gun and a DCS control system, and the joints of the components are completely sealed; the pressure transmitter is arranged on the hazardous waste liquid pipeline, the hazardous waste liquid pipeline and the tap water pipeline are merged through the three-way regulating valve and then merged with the compressed air pipeline, the DCS control system judges whether the hazardous waste liquid pipeline inputs waste liquid to the hazardous waste liquid spray gun according to the pressure indication of the pressure transmitter; when the hazardous waste liquid pipeline does not input waste liquid to the hazardous waste liquid spray gun, the DCS control system controls the water supply of the tap water pipeline through the three-way regulating valve, and sprays and cleans the hazardous waste liquid spray gun under the boost of compressed air.

[0006] When the hazardous waste liquid spray gun is working and cleaning, the compressed air pipeline is always providing compressed air, and the pressure range of compressed air is 0.18~0.28Mpa, which is 0.02~0.03Mpa lower than the pressure of hazardous waste liquid pipeline 1 when the hazardous waste liquid is normally input. The water supply pressure of the tap water pipeline is slightly higher than the pressure of compressed air, and the water supply pressure range is 0.25~0.35Mpa.

[0007] Preferably, hazardous waste liquid pipelines, pressure transmitters, waste liquid spray guns, and three-way regulating valves should be made of corrosion-resistant materials, including but not limited to polytetrafluoroethylene, 316L stainless steel, etc.

[0008] Preferably, the tap water pipeline and the compressed air pipeline are made of pressure-bearing materials, including but not limited to PVC, 304 stainless steel, etc.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. In the utility model, the DCS control system can realize automatic cleaning of the hazardous waste liquid spray gun, which solves the problem that the traditional hazardous waste liquid spray gun relies on manual cleaning of the spray gun, improves the automation level of the factory, and does not require manual intervention;

[0011] 2. In the utility model, the hazardous waste liquid spray gun is cleaned by an automatic cleaning device, and the cleaning effect is remarkable. After cleaning, there is no waste liquid residue in the gun body and the gun head of the waste liquid spray gun, and the cleaning is thorough, which solves the problem of gun body corrosion and blockage caused by incomplete cleaning, and saves production costs.

[0012] In summary, the utility model can clean the hazardous waste liquid spray gun, has good cleaning effect, and leaves no hazardous waste liquid residue, thus saving manpower, material resources and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the device of the utility model;

[0014] The names of the various parts are: hazardous waste liquid pipeline 1, tap water pipeline 2, compressed air pipeline 3, pressure transmitter 4, three-way regulating valve 5, hazardous waste liquid spray gun 6, DCS control system 7, electrical signal 8. DETAILED DESCRIPTION

[0015] Example 1

[0016] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0017] A three-way regulating valve 5 is used to connect the hazardous waste liquid pipeline 1 and the tap water pipeline 2 near the hazardous waste liquid spray gun 6. The three-way regulating valve 5 has two inlets and one outlet. The hazardous waste liquid pipeline 1 is connected to one inlet and outlet of the three-way regulating valve 5 respectively, and the tap water pipeline 2 is connected to the other inlet of the three-way regulating valve 5. The inlet and outlet of the three-way regulating valve 5 are in a normally open state. The pressure transmitter 4 is installed on the hazardous waste liquid pipeline 1. The pressure transmitter 4 and the three-way regulating valve 5 are interlocked with the DCS control system 7 through an electrical signal 8. When the hazardous waste liquid spray gun 6 is spraying normally, the pressure transmitter 4 detects that the pressure of the hazardous waste liquid pipeline 1 is greater than 0, and transmits a current signal to the DCS control system 7 (the current signal transmitted by the pressure transmitter is between 4 and 20 mA, and the larger the current signal, the greater the pipeline pressure. When the transmitted current signal is 4 mA, it indicates that the pressure of the hazardous waste liquid pipeline 1 is 0). This signal is the first signal; after receiving the first signal, the DCS control system 7 generates a second signal to control the three-way regulating valve 5 to connect to the inlet of the tap water pipeline 2 to close according to the size of the received first signal (greater than 4 mA). When the waste liquid stops spraying, the pressure transmitter 4 detects that the pressure on the hazardous waste liquid pipeline 1 is 0, and the pressure transmitter 4 transmits a first signal with a current signal of 4 mA to the DCS control system. After receiving the first signal, the DCS control system generates a second signal to control the three-way regulating valve 5 to connect to the inlet of the tap water pipeline 2 to open. At this time, the clean water in the tap water pipeline 2 enters the spray gun, and the compressed air in the compressed air pipeline 3 starts to clean the hazardous waste liquid spray gun 6.

[0018] In some embodiments of the utility model, the diameter of the hazardous waste liquid pipeline 1 is DN25; the diameter of the tap water pipeline 2 is DN25; the three-way regulating valve is a common flange-type three-way regulating valve on the market, and no proportional adjustment function is required; the pressure transmitter adopts a high-precision and corrosion-resistant pressure transmitter.

[0019] In some embodiments of the utility model, the cleaning time of the hazardous waste liquid spray gun 6 is set to 30 seconds through the DCS control system 7 (as long as there is no hazardous waste liquid input into the hazardous waste liquid pipeline 1, tap water is used to clean the hazardous waste liquid spray gun 6). When the cleaning time is reached, the DCS control system transmits a third signal to the three-way regulating valve 5. At this time, the inlet of the tap water pipeline 1 connected to the three-way regulating valve 5 is closed, and the cleaning is completed.

[0020] In some embodiments of the utility model, the compressed air pipeline 3 can be used to control the atomization effect of the hazardous waste liquid spray gun 6. The pressure of the compressed air pipeline 3 can be adjusted to be lower than the pressure of the hazardous waste liquid pipeline 1 when the hazardous waste liquid is normally input (0.02~0.03Mpa). At this time, the atomization effect of the hazardous waste liquid spray gun 6 when spraying hazardous waste liquid is better, and the effect of the hazardous waste liquid spray gun 6 during cleaning is also the best.

[0021] This embodiment solves the problems of manual cleaning of the waste liquid spray gun, corrosion, clogging and the like caused by incomplete cleaning of the waste liquid spray gun, improves the automation level of the factory, and saves the operation cost of the factory.

Claims

1. A device for automatically cleaning a hazardous waste liquid spray gun, characterized in that: The invention is composed of a hazardous waste liquid pipeline (1), a tap water pipeline (2), a compressed air pipeline (3), a pressure transmitter (4), a three-way regulating valve (5), a hazardous waste liquid spray gun (6) and a DCS control system (7), and the joints of the components are completely sealed; the pressure transmitter (4) is arranged on the hazardous waste liquid pipeline (1), and the hazardous waste liquid pipeline (1) and the tap water pipeline (2) are merged through the three-way regulating valve (5) and then merged with the compressed air pipeline (3); the pressure transmitter (4) and the three-way regulating valve (5) are interlocked with the DCS control system (7) through an electrical signal (8); when the hazardous waste liquid pipeline (1) does not input waste liquid to the hazardous waste liquid spray gun (6), the DCS control system (7) controls the tap water pipeline to supply water through the three-way regulating valve (5), and sprays and washes the hazardous waste liquid spray gun (6) under the pressure increase of the compressed air in the compressed air pipeline (3).

2. The device for automatically cleaning a hazardous waste liquid spray gun according to claim 1, characterized in that: The pressure range of the compressed air in the compressed air pipeline (3) is 0.18-0.28 MPa, the pressure range of the hazardous waste liquid in the hazardous waste liquid pipeline (1) is 0.02-0.03 MPa, and the pressure range of the tap water in the tap water pipeline (2) is 0.25-0.35 MPa.

3. The device for automatically cleaning a hazardous waste liquid spray gun according to claim 1, characterized in that: The diameter of the hazardous waste liquid pipeline (1) is DN25, the diameter of the tap water pipeline (2) is DN25, the three-way regulating valve (5) is a flange-type three-way regulating valve, and the pressure transmitter (4) is a high-precision corrosion-resistant pressure transmitter.

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