Dry spray booth and waste liquid treatment method

Abstract

The invention relates to the technical field of paint spraying equipment, and provides a dry type paint spraying chamber and a waste liquid treatment method, and the dry type paint spraying chamber comprises a paint spraying mechanism, a waste paint collecting assembly and a waste solvent collecting assembly. Wherein the paint spraying mechanism comprises a spraying state and a color changing state, when the paint spraying mechanism is in the spraying state, paint can be sprayed to a workpiece, and when the paint spraying mechanism is in the color changing state, residual paint in the last batch can be cleaned, and the paint in the new batch can be filled; the waste paint collecting assembly is used for collecting first waste liquid discharged by the paint spraying mechanism in the color changing state. The waste solvent collecting assembly is used for collecting second waste liquid discharged by the paint spraying mechanism in the color changing state, and the coating concentration in the first waste liquid is larger than that in the second waste liquid. Therefore, waste liquid discharged by the paint spraying mechanism in a color changing state can be classified, so that the waste liquid can be correspondingly treated subsequently. Therefore, the waste of materials and energy can be reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of painting equipment, and particularly to a dry spray booth and a waste liquid treatment method. Background Art

[0002] With the improvement of the working environment and environmental protection requirements, dry spray booths have been gradually applied in the engine industry. Different from traditional wet spray booths that use circulating water for waste liquid collection, after the dry spray booth is put into use, a centralized collection method is usually adopted. This process mainly applies to single-component or two-component (not easy to react and accumulate during the collection cycle) coatings. After collection, unified discharge or unified purification treatment is usually carried out. If discharged uniformly, it is easy to cause waste of materials. For example, the unsaturated solvent is also discharged together, resulting in waste of materials. If purified uniformly, the part with a high coating content is difficult to purify and has low recycling value.

[0003] Therefore, there is an urgent need for a dry spray booth and a waste liquid treatment method to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a dry spray booth and a waste liquid treatment method, which can reduce the waste of materials and energy and lower the operation cost.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A dry spray booth, comprising:

[0007] A painting mechanism, including a spraying state and a color-changing state. When in the above spraying state, it can spray paint on the workpiece. When in the above color-changing state, it can clean the remaining paint of the previous batch and fill the paint of the new batch;

[0008] A waste paint collection assembly for collecting the first waste liquid discharged by the painting mechanism in the above color-changing state;

[0009] A waste solvent collection assembly for collecting the second waste liquid discharged by the painting mechanism in the above color-changing state, and the paint concentration in the above first waste liquid is greater than the paint concentration in the above second waste liquid.

[0010] As a preferred technical solution of the above dry spray booth, the waste solvent collection assembly includes a circulation pipe group and a driving member. The circulation pipe group can obtain the second waste liquid from the painting mechanism, and the driving member can drive the second waste liquid to maintain a flowing state in the circulation pipe group.

[0011] As a preferred technical solution of the above dry spray booth, it further includes a purification device, which can obtain the second waste liquid from the above waste solvent collection component and can separate the second waste liquid into second waste liquid A and second waste liquid B, and the paint concentration in the second waste liquid A is greater than the paint concentration in the second waste liquid B.

[0012] As a preferred technical solution of the above dry spray booth, the waste solvent collection component further includes a second waste liquid collection container. The outlet of the above circulation pipe group can be selectively communicated with the inlet of the second waste liquid collection container, and the outlet of the second waste liquid collection container can be selectively communicated with the inlet of the purification device.

[0013] As a preferred technical solution of the above dry spray booth, it further includes an exhaust pipe and a reflux pipe. The purification device can be communicated with the waste paint collection component through the exhaust pipe, and the purification device can be communicated with the spray painting mechanism through the reflux pipe.

[0014] As a preferred technical solution of the above dry spray booth, the waste paint collection component includes a first waste liquid collection container A and a first waste liquid collection container B. The volume of the first waste liquid collection container B is greater than the volume of the first waste liquid collection container A. The first waste liquid collection container A can obtain the first waste liquid from the spray painting mechanism and can inject the first waste liquid into the first waste liquid collection container B. The purification device outputs the first waste liquid A to the second waste liquid collection container B through the exhaust pipe.

[0015] A waste liquid treatment method is also provided, which is applicable to the above dry spray booth and includes:

[0016] Obtain the instruction of the above color change state;

[0017] The above spray painting mechanism outputs the first waste liquid to the waste paint collection component and starts timing t;

[0018] When t = T, the above spray painting mechanism is disconnected from the waste paint collection component and outputs the second waste liquid to the waste solvent collection component.

[0019] As a preferred technical solution of the above waste liquid treatment method, obtain the volume v of the second waste liquid in the above circulation pipe group. If v ≥ V, the above circulation pipe group discharges the second waste liquid into the second waste liquid collection container until 0 < v < V is satisfied.

[0020] As a preferred technical solution of the above waste liquid treatment method, obtain the working state of the above painting mechanism. If the above painting mechanism is in the above spraying state or the above color-changing state, the above second waste liquid remains in a flowing state in the above circulation pipe group. If the above painting mechanism is in a shutdown state, the above second waste liquid is discharged from the above circulation pipe group into the above second waste liquid collection container.

[0021] As a preferred technical solution of the above waste liquid treatment method, obtain the liquid level information h of the above second waste liquid in the above second waste liquid collection container. If h≥H, the above second waste liquid collection container outputs the above second waste liquid to the above purification device.

[0022] Advantages of the present invention:

[0023] The present invention provides a dry spray booth, including a painting mechanism, a waste paint collection component, and a waste solvent collection component. Among them, the painting mechanism includes a spraying state and a color-changing state. When in the spraying state, it can spray paint on the workpiece. When in the color-changing state, it can clean the residual paint of the previous batch and fill the paint of the new batch; the waste paint collection component is used to collect the first waste liquid discharged by the painting mechanism in the color-changing state; the waste solvent collection component is used to collect the second waste liquid discharged by the painting mechanism in the color-changing state, and the paint concentration in the first waste liquid is greater than the paint concentration in the second waste liquid.

[0024] Specifically, the present invention also provides a waste liquid treatment method applicable to the above dry spray booth, including: obtaining an instruction for the color-changing state; the painting mechanism outputs the first waste liquid to the waste paint collection component and starts timing t; when t = T, the painting mechanism disconnects from the waste paint collection component and outputs the second waste liquid to the waste solvent collection component.

[0025] During use, the painting mechanism includes a spraying state and a color-changing state. The painting mechanism needs to change the paint according to process requirements. After obtaining the instruction to switch to the color-changing state, the supply of paint to the painting mechanism is stopped, that is, the painting mechanism no longer sprays paint on the workpiece in the color-changing state. The painting mechanism obtains a solvent, and the paint can be dissolved in the solvent. The solvent flushes the inside of the painting mechanism. The solvent discharged from the painting mechanism is respectively the first waste liquid and the second waste liquid. During the flushing period, when t < T, the painting mechanism discharges the first waste liquid into the waste paint collection component. When t≥T, the painting mechanism discharges the second waste liquid into the waste solvent collection component. In the early stage of flushing, that is, in the time period of 0 - T, the content of the residual paint in the painting mechanism is relatively large. As the flushing progresses, the content of the paint gradually decreases, that is, the paint concentration in the first waste liquid is greater than the paint concentration in the second waste liquid. In this way, the waste liquid discharged by the painting mechanism in the color-changing state can be classified for subsequent corresponding treatment. Furthermore, it can reduce the waste of materials and energy and lower the operation cost. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description in the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings.

[0027] Figure 1 It is a schematic structural diagram of a dry spray booth provided by an embodiment of the present invention.

[0028] In the figure:

[0029] 100, spray painting mechanism; 110, paint transfer and adjustment assembly; 111, first solvent container; 112, curing agent container; 113, color paint container; 114, second solvent container; 120, mixing device; 121, curing agent color change valve; 122, color paint color change valve; 130, spray painting robot;

[0030] 200, waste paint collection assembly; 210, first waste liquid collection container A; 220, first waste liquid collection container B;

[0031] 300, waste solvent collection assembly; 310, circulation pipe group; 320, driving member; 330, second waste liquid collection container;

[0032] 400, purification device;

[0033] 510, discharge pipeline; 520, reflux pipeline. Detailed implementation manners

[0034] The following will further elaborate on the present invention in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] As Figure 1 shown, the present invention provides a dry spray booth, including a spraying mechanism 100, a waste paint collection assembly 200 and a waste solvent collection assembly 300. Among them, the spraying mechanism 100 includes a spraying state and a color-changing state. When in the spraying state, it can spray paint onto the workpiece. When in the color-changing state, it can clean the residual paint of the previous batch and fill the paint of the new batch; the waste paint collection assembly 200 is used to collect the first waste liquid discharged by the spraying mechanism 100 in the color-changing state; the waste solvent collection assembly 300 is used to collect the second waste liquid discharged by the spraying mechanism 100 in the color-changing state, and the paint concentration in the first waste liquid is greater than the paint concentration in the second waste liquid.

[0039] Specifically, the present invention also provides a waste liquid treatment method, which is applicable to the above-mentioned dry spray booth, and includes: obtaining an instruction for the color-changing state; the spraying mechanism 100 outputs the first waste liquid to the waste paint collection assembly 200 and starts timing t; when t = T, the spraying mechanism 100 disconnects from the waste paint collection assembly 200 and outputs the second waste liquid to the waste solvent collection assembly 300.

[0040] In use, the paint spraying mechanism 100 includes a spraying state and a color-changing state. The paint spraying mechanism 100 needs to change the paint according to the process requirements. After receiving the instruction to switch to the color-changing state, the supply of paint to the paint spraying mechanism 100 is stopped, that is, the paint spraying mechanism 100 does not spray paint on the workpiece in the color-changing state. The paint spraying mechanism 100 obtains a solvent in which the paint can be dissolved, and the solvent flushes the inside of the paint spraying mechanism 100. The solvent discharged from the paint spraying mechanism 100 is divided into a first waste liquid and a second waste liquid. During the flushing period, when t < T, the paint spraying mechanism 100 discharges the first waste liquid into the waste paint collection assembly 200. When t ≥ T, the paint spraying mechanism 100 discharges the second waste liquid into the waste solvent collection assembly 300. In the early stage of flushing, that is, in the time period from 0 to T, the content of the paint remaining in the paint spraying mechanism 100 is relatively large. As the flushing progresses, the content of the paint gradually decreases, that is, the paint concentration in the first waste liquid is greater than the paint concentration in the second waste liquid. In this way, the waste liquid discharged by the paint spraying mechanism 100 in the color-changing state can be classified for subsequent corresponding treatment. Furthermore, material and energy waste can be reduced, and the operation cost can be lowered.

[0041] Exemplarily, the paint spraying mechanism 100 includes a paint spraying robot 130, a paint transfer and adjustment assembly 110, and a mixing device 120.

[0042] Among them, based on a precise mechanical structure and an advanced control system, the spraying arm of the paint spraying robot 130 can move in multiple degrees of freedom. The movement trajectory, speed, and spraying thickness of the spray gun are preset by a program, and the sensors built into the system monitor the spraying process and the coating quality in real time.

[0043] Among them, the paint transfer and adjustment assembly 110 includes a pump body, a first solvent container 111, a curing agent container 112, a color paint container 113, and a second solvent container 114. Among them, the first solvent container 111 contains a solvent that can dissolve the curing agent, the curing agent container 112 contains a curing agent, the color paint container 113 contains paint, and the second solvent container 114 contains a solvent that can dissolve the paint. The pump body is used to drive the fluids in the above-mentioned first solvent container 111, curing agent container 112, color paint container 113, and second solvent container 114 to be transported to corresponding positions.

[0044] Among them, the mixing device 120 includes a curing agent color change valve 121 and a paint color change valve 122. Both the first solvent container 111 and the curing agent container 112 can supply materials to the curing agent color change valve 121, and both the paint container 113 and the second solvent container 114 can supply materials to the paint color change valve 122. When the spraying mechanism 100 is in the spraying state, the curing agent color change valve 121 is only supplied with materials by the curing agent container 112, and the paint color change valve 122 is only supplied with materials by the paint container 113. Through an accurate metering system, the curing agent color change valve 121 and the paint color change valve 122 are adjusted to supply materials quantitatively according to a preset ratio, and then are fully mixed evenly in the mixing cavity to meet the requirements of the spraying process for the paint, and then supply materials to the spraying robot 130. When the spraying mechanism 100 is in the color change state, the curing agent color change valve 121 is only supplied with materials by the first solvent container 111, and the paint color change valve 122 is only supplied with materials by the second solvent container 114. The solvent cleans the corresponding curing agent color change valve 121, paint color change valve 122 and spraying robot 130.

[0045] Optionally, the waste solvent collection assembly 300 includes a circulation pipe group 310 and a driving member 320. The circulation pipe group 310 can obtain the second waste liquid from the spraying mechanism 100, and the driving member 320 can drive the second waste liquid to maintain a flowing state in the circulation pipe group 310.

[0046] Specifically, during use, when the spraying mechanism 100 switches to the color change state, the discharge port of the spraying mechanism 100 is docked with the feed port of the circulation pipe group 310, and the second waste liquid is discharged from the spraying mechanism 100 into the circulation pipe group 310. In the circulation pipe group 310, the driving member 320 generates a driving force to drive the second waste liquid to always be in a flowing state in the circulation pipe group 310. On the one hand, it can avoid the wall hanging and precipitation caused by the static state of the second waste liquid. Moreover, the continuous flow of the second waste liquid can also scour the inner wall of the circulation pipe group 310, peeling off the wall hanging and precipitation from the inner wall of the pipe group, thereby avoiding the blockage of the circulation pipe group 310 due to the accumulation of wall hanging and precipitation and reducing the subsequent cleaning workload of the circulation pipe group 310.

[0047] Furthermore, a one-way valve is installed at the feed port of the circulation pipe group 310. The one-way valve only allows the second waste liquid to flow unidirectionally from the spraying mechanism 100 to the circulation pipe group 310. In this way, it prevents the second waste liquid from flowing back out of the feed port of the circulation pipe group 310 under the action of the driving member 320.

[0048] Optionally, the dry spray booth further includes a purification device 400, which can obtain the second waste liquid from the waste solvent collection assembly 300 and can separate the second waste liquid into a second waste liquid A and a second waste liquid B. The paint concentration in the second waste liquid A is greater than the paint concentration in the second waste liquid B.

[0049] With such a setting, through the separation of the purification device 400, the second waste liquid is further processed and divided into a second waste liquid A and a second waste liquid B according to the concentration of the coating, so as to be processed differently in the subsequent process and avoid energy waste.

[0050] Optionally, the waste solvent collection assembly 300 further includes a second waste liquid collection container 330. The discharge port of the circulation pipe group 310 can be selectively communicated with the feed port of the second waste liquid collection container 330, and the discharge port of the second waste liquid collection container 330 can be selectively communicated with the feed port of the purification device 400.

[0051] Specifically, the discharge port of the circulation pipe group 310 is connected to the feed port of the second waste liquid collection container 330 through a first solenoid valve. The first solenoid valve can adjust the connection or disconnection between the circulation pipe group 310 and the second waste liquid collection container 330. A second solenoid valve is provided between the discharge port of the second waste liquid collection container 330 and the feed port of the purification device 400, and the second solenoid valve is used to adjust the connection or disconnection between the second waste liquid collection container 330 and the purification device 400.

[0052] During use, when the painting mechanism 100 is in a working state and the tooling state includes a spraying state and a color-changing state, the volume v of the second waste liquid in the circulation pipe group 310 is obtained. If 0 < v < V, the first solenoid valve is closed, the circulation pipe group 310 is disconnected from the second waste liquid collection container 330, and after the second waste liquid is discharged from the painting mechanism 100, it is stored in the circulation pipe group 310 to ensure that there is a part of the second waste liquid in the circulation pipe group 310 for circulation. If v ≥ V, it indicates that the second waste liquid in the circulation pipe group 310 is too much, the output power of the driving member 320 for driving the second waste liquid to maintain a flowing state is too large, or it is about to exceed the volume of the circulation pipe group 310. At this time, the first solenoid valve is opened, and the circulation pipe group 310 discharges the second waste liquid into the second waste liquid collection container 330 until 0 < v < V is satisfied.

[0053] Exemplarily, the volume of the second waste liquid in the circulation pipe group 310 can be obtained according to the flow rate and discharge time when the painting mechanism 100 discharges the second waste liquid in the color-changing state.

[0054] If the painting mechanism 100 is in a stopped state, the second waste liquid is discharged from the circulation pipe group 310 into the second waste liquid collection container 330, and the driving member 320 for driving the second waste liquid to circulate in the circulation pipe group 310 can also be stopped to save energy.

[0055] Further, a liquid level sensor is provided in the second waste liquid collection container 330 for obtaining the liquid level information h of the second waste liquid in the second waste liquid collection container 330. The second electromagnetic valve is normally closed. If h≥H, it means that the second waste liquid is about to exceed the volume of the second waste liquid collection container 330. At this time, the second electromagnetic valve is opened, and the second waste liquid collection container 330 outputs the second waste liquid to the purification device 400. In this way, the purification device 400 can centrally purify the second waste liquid, shorten the operation time of the purification device 400, and thus reduce energy consumption.

[0056] Optionally, the dry spray booth further includes an exhaust pipe 510 and a return pipe 520. The purification device 400 can be connected to the waste paint collection assembly 200 through the exhaust pipe 510, and the purification device 400 can be connected to the painting mechanism 100 through the return pipe 520.

[0057] Exemplarily, since the content of the paint in the first waste liquid and the second waste liquid A is too high, it is difficult and costly to carry out purification treatment. Therefore, they are both classified as non-recyclable waste. The purification device 400 discharges the second waste liquid A into the waste paint collection assembly 200, and the second waste liquid A is uniformly treated after merging with the first waste liquid. Since the content of the paint in the second waste liquid B is relatively low, that is, the absorption capacity of the solvent for the paint is not saturated, it can be reused. The purification device 400 injects the second waste liquid B into the painting mechanism 100 through the return pipe 520 for the next flushing operation.

[0058] Optionally, the waste paint collection assembly 200 includes a first waste liquid collection container A210 and a first waste liquid collection container B220. The volume of the first waste liquid collection container B220 is larger than that of the first waste liquid collection container A210. The first waste liquid collection container A210 can obtain the first waste liquid from the painting mechanism 100 and inject the first waste liquid into the first waste liquid collection container B220. The purification device 400 outputs the first waste liquid A to the second waste liquid collection container 330B through the exhaust pipe 510.

[0059] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Dry spray booth, characterized in that: include: A paint spraying mechanism (100) comprises a spraying state and a color changing state. When in the spraying state, the paint can be sprayed onto the workpiece. When in the color changing state, the paint remaining from a previous batch can be cleaned and a new batch of the paint can be filled. A waste paint collection component (200) is used to collect the first waste liquid discharged by the paint spraying mechanism (100) in the color changing state; The waste solvent collection component (300) is used to collect the second waste liquid discharged by the paint spraying mechanism (100) in the color-changing state, the paint concentration in the first waste liquid being greater than the paint concentration in the second waste liquid.

2. The dry spray booth according to claim 1, characterized in that: The waste solvent collection assembly (300) comprises a circulation pipe group (310) and a driving member (320), wherein the circulation pipe group (310) can obtain the second waste liquid from the paint spraying mechanism (100), and the driving member (320) can drive the second waste liquid to maintain a flowing state in the circulation pipe group (310).

3. The dry spray booth according to claim 2, characterized in that: It also includes a purification device (400) capable of obtaining the second waste liquid from the waste solvent collection component (300) and separating the second waste liquid into a second waste liquid A and a second waste liquid B, wherein the coating concentration in the second waste liquid A is greater than the coating concentration in the second waste liquid B.

4. The dry spray booth according to claim 3, characterized in that: The waste solvent collection assembly (300) also includes a second waste liquid collection container (330), and the outlet of the circulation pipe group (310) can be selectively connected to the feed port of the second waste liquid collection container (330), and the outlet of the second waste liquid collection container (330) can be selectively connected to the feed port of the purification device (400).

5. The dry spray booth according to claim 4, characterized in that: It also includes a discharge pipe (510) and a return pipe (520), the purification device (400) can be communicated with the waste paint collection assembly (200) through the discharge pipe (510), and the purification device (400) can be communicated with the paint spraying mechanism (100) through the return pipe (520).

6. The dry spray booth according to claim 5, characterized in that: The waste paint collection assembly (200) comprises a first waste liquid collection container A (210) and a first waste liquid collection container B (220), wherein the volume of the first waste liquid collection container B (220) is greater than the volume of the first waste liquid collection container A (210), the first waste liquid collection container A (210) is capable of obtaining the first waste liquid from the paint spraying mechanism (100) and is capable of injecting the first waste liquid into the first waste liquid collection container B (220), and the purification device (400) outputs the first waste liquid A to the second waste liquid collection container (330) B through the discharge pipe (510).

7. A method for treating waste liquid, applicable to the dry spray booth according to claim 6, characterized in that: include: Obtaining an instruction for the color-changing state; The paint spraying mechanism (100) outputs the first waste liquid to the waste paint collecting assembly (200), and a time t is set; When t=T, the paint spraying mechanism (100) is disconnected from the waste paint collecting component (200) and outputs the second waste liquid to the waste solvent collecting component (300).

8. The waste liquid treatment method according to claim 7, characterized in that: The volume v of the second waste liquid in the circulation pipe group (310) is obtained. If v≥V, the circulation pipe group (310) discharges the second waste liquid into the second waste liquid collection container (330) until 0<v<V is satisfied.

9. The waste liquid treatment method according to claim 8, characterized in that: The working state of the paint spraying mechanism (100) is obtained. If the paint spraying mechanism (100) is in the spraying state or the color changing state, the second waste liquid is kept flowing in the circulation pipe group (310). If the paint spraying mechanism (100) is in the shutdown state, the second waste liquid is discharged from the circulation pipe group (310) into the second waste liquid collection container (330).

10. The waste liquid treatment method according to claim 8, characterized in that: The liquid level information h of the second waste liquid in the second waste liquid collection container (330) is obtained, and if h≥H, the second waste liquid collection container (330) outputs the second waste liquid to the purification device (400).

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