Alkali washing and rinsing integrated device for extrusion container

Abstract

The utility model discloses an alkali washing and rinsing integrated device for an extrusion container. The alkali washing and rinsing integrated device comprises a washing liquid circulating system and an alkali washing and rinsing tool, the alkali washing rinsing tool comprises a first sealing cover and a second sealing cover, the first sealing cover and the second sealing cover are oppositely arranged and installed on the corresponding sealing cover moving sliding frames respectively, the first sealing cover and the second sealing cover can be connected through a locking assembly, the first sealing cover is provided with a liquid inlet and a liquid outlet, and the second sealing cover is provided with a liquid outlet. A drain outlet is formed in the second sealing cover; the washing liquid circulating system is installed on the movable circulating system moving carriage, the outlet end of a liquid supply pipe of the washing liquid circulating system is communicated with the liquid inlet, and the inlet end of a backflow pipe of the washing liquid circulating system is communicated with the liquid outlet. By the adoption of the extrusion container alkali washing and rinsing integrated device, the integration degree is high; the use is more flexible, and the transfer cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to extrusion cylinder cleaning device technical field, concretely relates to a kind of extrusion cylinder caustic soda washing and rinsing integrated device. BACKGROUND

[0002] During the production extrusion of aluminum profile, various pollutants such as oil, dust, aluminum chips will adhere to the inner wall of the extrusion cylinder, which not only affects the quality of aluminum profile, but also has adverse effects on subsequent processing and surface treatment process. Alkaline washing and rinsing can effectively remove these pollutants and improve the cleanliness of the inner wall of the extrusion cylinder, ensuring the quality of aluminum profile.

[0003] According to patent CN201810700967.9, the existing caustic soda washing equipment is complex and dispersed, and different pipeline systems are required for caustic soda washing and rinsing. The degree of integration is low. The caustic soda washing equipment cannot be moved, and when caustic soda washing and rinsing of the extrusion cylinder are needed, the extrusion cylinder must be transported to a fixed place, which is not flexible to use and increases the transportation cost. UTILITY MODEL CONTENT

[0004] To solve the technical problem of low degree of integration and immobility of the existing caustic soda washing equipment, the utility model provides an extrusion cylinder caustic soda washing and rinsing integrated device.

[0005] The technical solution is as follows:

[0006] The present application relates to an extrusion cylinder caustic soda washing and rinsing integrated device, which comprises a washing liquid circulation system and a caustic soda washing and rinsing tool.

[0007] The caustic soda washing and rinsing tool comprises a first sealing cover and a second sealing cover, which are arranged oppositely and installed on corresponding sealing cover moving carriages, respectively. The first sealing cover and the second sealing cover can be connected by a locking assembly, which comprises at least one pull rod. The two ends of the pull rod can pass through the first sealing cover and the second sealing cover, respectively, and then the first sealing cover and the second sealing cover can be locked at both ends of the extrusion cylinder by locking nuts threaded with them, to block the openings at both ends of the extrusion cylinder. The first sealing cover is provided with an inlet and an outlet, and the second sealing cover is provided with a sewage outlet.

[0008] The washing liquid circulation system is installed on a movable circulation system moving carriage. The outlet end of the liquid supply pipe of the washing liquid circulation system is communicated with the inlet, and the inlet end of the return pipe of the washing liquid circulation system is communicated with the outlet. The washing liquid circulation system can inject caustic soda or clean water into the inlet through the liquid supply pipe, and can recover caustic soda or sewage flowing out of the outlet through the return pipe.

[0009] The alkali washing and rinsing integrated device can share the washing liquid circulating system during alkali washing and rinsing, and has high integration degree; the alkali washing and rinsing tool and the washing liquid circulating system can be moved, and use is more flexible, and transportation cost is saved.

[0010] In some embodiments, each of the first sealing cover and the second sealing cover is provided with a heating device, a heating end of each heating device is located between the first sealing cover and the second sealing cover, and a heating joint of each heating device is located on a side of the first sealing cover and the second sealing cover away from each other.

[0011] The first sealing cover and / or the second sealing cover is provided with a temperature measuring device, a temperature measuring probe of the temperature measuring device is located between the first sealing cover and the second sealing cover, and a temperature measuring joint of the temperature measuring device is located on a side of the first sealing cover or the second sealing cover away from the extrusion barrel.

[0012] In some embodiments, the top of the second sealing cover is provided with an overflow port.

[0013] In some embodiments, the first sealing cover and the second sealing cover are both in the form of a cylindrical groove, the groove ends of the two are both directed towards each other, the groove bottom of the first sealing cover is provided with a plurality of first pull rod mounting holes uniformly distributed in a circumferential direction, the groove bottom of the second sealing cover is provided with a plurality of second pull rod mounting holes uniformly distributed in a circumferential direction, the first pull rod mounting holes and the second pull rod mounting holes are symmetrically distributed and are both adapted to the pull rods, and both ends of each pull rod respectively passes through the corresponding first pull rod mounting hole and the second pull rod mounting hole.

[0014] In some embodiments, the side of the groove wall of the first sealing cover and the second sealing cover close to each other is respectively provided with an annular clamping groove adapted to the corresponding end of the extrusion barrel, and each annular clamping groove is embedded with a sealing cover sealing ring.

[0015] In some embodiments, the lock nut and the corresponding first sealing cover and second sealing cover are provided with a pull rod sealing ring and a gasket, and each pull rod sealing ring is located on a side of the corresponding gasket close to the first sealing cover and the second sealing cover.

[0016] In some embodiments, the extrusion barrel support seat for supporting the extrusion barrel is arranged between the two sealing cover moving carriages.

[0017] In some embodiments, each lock nut is provided with a retreat stop screw, each retreat stop screw is threadedly connected with a threaded hole on the corresponding lock nut, and can abut against the external thread of the corresponding pull rod.

[0018] In some embodiments, the washing liquid circulating system comprises a water storage tank, an alkali storage tank, a circulating pipeline, a booster pump, and a power supply for the booster pump.

[0019] The water storage tank is provided with a water inlet, and the alkali storage tank is provided with an alkali inlet; the circulating pipeline comprises a water conveying pipe, an alkali conveying pipe, a drainage pipe, a first connecting pipeline, a second connecting pipeline and a third connecting pipeline; the inlet end of the water conveying pipe is communicated with the water outlet of the water storage tank, and the outlet end of the water conveying pipe is communicated with the middle part of the first connecting pipeline; the inlet end of the alkali conveying pipe is communicated with the alkali outlet of the alkali storage tank, and the outlet end of the alkali conveying pipe is communicated with the middle part of the first connecting pipeline; the inlet end of the first connecting pipeline is communicated with the outlet end of the backflow pipe, and the outlet end of the first connecting pipeline is connected with the inlet of the booster pump; the inlet end of the second connecting pipeline is connected with the outlet of the booster pump, and the outlet end of the second connecting pipeline is communicated with the alkali return inlet of the alkali storage tank; the inlet end of the drainage pipe is communicated with the middle part of the second connecting pipeline, and the outlet end of the drainage pipe is communicated with the sewage storage device; the inlet end of the third connecting pipeline is communicated with the middle part of the second connecting pipeline, and the outlet end of the third connecting pipeline is communicated with the inlet end of the liquid supply pipe.

[0020] The water conveying pipe is provided with a water outlet total valve at the end close to the water storage tank, and is provided with a water outlet on-off valve at the end close to the first connecting pipeline; the first connecting pipeline is provided with a backflow valve at the end close to the backflow pipe; the alkali conveying pipe is provided with an alkali outlet valve at the end close to the alkali storage tank; the second connecting pipeline is provided with an alkali return valve at the end close to the alkali storage tank; the drainage pipe is provided with a drainage valve; and the third connecting pipeline is provided with an outlet valve. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the utility model;

[0022] Figure 2 It is a structural schematic view of the alkali washing and rinsing tool;

[0023] Figure 3 It is a schematic view of the utility model in the process of alkali liquid feeding and alkali washing;

[0024] Figure 4 It is a schematic view of the utility model in the process of alkali liquid discharging;

[0025] Figure 5 It is a schematic view of the utility model in the process of residual material discharging;

[0026] Figure 6 It is a schematic view of the utility model in the process of rinsing and clean water feeding;

[0027] Figure 7 It is a schematic view of the utility model in the process of rinsing and sewage discharging. DETAILED DESCRIPTION

[0028] The utility model will be further described below in combination with the embodiments and the drawings.

[0029] As Figure 1 shown, an integrated alkaline washing and rinsing device for extrusion barrel includes a washing liquid circulation system and an alkaline washing and rinsing tool.

[0030] As Figure 1 and Figure 2 shown, the alkaline washing and rinsing tool mainly includes a first sealing cover 1, a second sealing cover 2, a locking assembly, a heating device 9, and a temperature measuring device 10. The first sealing cover 1 and the second sealing cover 2 are oppositely arranged and respectively installed on corresponding sealing cover moving carriages 3. Both the first sealing cover 1 and the second sealing cover 2 are movable, which makes the use more flexible and enables the use in different scenarios. An extrusion barrel support seat 23 for supporting the extrusion barrel A is arranged between the two sealing cover moving carriages 3. The extrusion barrel support seat 23 is in the shape of an H-shaped section, which can stably support the extrusion barrel A and ensure the stability of the extrusion barrel A during the alkaline washing and rinsing process. The top of the first sealing cover 1 is provided with a liquid inlet 1a, and the bottom is provided with a liquid outlet 1b. The top of the second sealing cover 2 is provided with an overflow port 2b, which is in communication with one end of an overflow pipe 27. The other end of the overflow pipe 27 is in communication with a waste pool or a sewage bucket. The overflow pipe 27 can effectively avoid the safety hazards during the alkaline washing process. The bottom of the second sealing cover 2 is provided with a sewage outlet 2a, which is in communication with one end of a sewage pipe 25. The other end of the sewage pipe 25 is in communication with a waste pool or a sewage bucket. A sewage valve 26 is arranged on the sewage pipe 25. The first sealing cover 1 and the second sealing cover 2 can adopt various shapes. The side of each sealing cover close to the other sealing cover is respectively provided with a sealing structure or a sealing member adapted to the opening at the corresponding end of the extrusion barrel A, so as to seal the opening at the two ends of the extrusion barrel A. In the present embodiment, the first sealing cover 1 and the second sealing cover 2 are preferably groove-shaped structures formed by a circular groove bottom and an annular barrier wall. The groove openings of the two sealing covers are both directed towards each other. The groove walls of the first sealing cover 1 and the second sealing cover 2 located on one side of the groove opening are respectively provided with annular clamping grooves adapted to the corresponding end of the extrusion barrel A. A sealing cover sealing ring 22 is embedded in each annular clamping groove. The sealing cover sealing ring 22 is preferably a sealing rubber ring, which improves the sealing between the first sealing cover 1, the second sealing cover 2, and the extrusion barrel A. The heating device 9 is arranged on each of the first sealing cover 1 and the second sealing cover 2. The heating end 9a of each heating device 9 is located between the first sealing cover 1 and the second sealing cover 2. The heating connector 9b of each heating device 9 is respectively located on the side of the first sealing cover 1 and the second sealing cover 2 away from each other. The temperature measuring device 10 is arranged on the second sealing cover 2. The temperature measuring device 10 can also be arranged on the first sealing cover 1, or one temperature measuring device 10 can be respectively arranged on the first sealing cover 1 and the second sealing cover 2. The temperature measuring probe of the temperature measuring device 10 is located between the first sealing cover 1 and the second sealing cover 2. The temperature measuring connector of the temperature measuring device 10 is located on the side of the corresponding first sealing cover 1 or second sealing cover 2 away from the extrusion barrel A. The heating device 9 and the temperature measuring device 10 can be used to adjust the reaction temperature in the extrusion barrel A in real time during the alkaline washing process, thereby improving the alkaline washing efficiency.

[0031] The locking assembly is used to connect the first sealing cover 1 and the second sealing cover 2, and comprises a pull rod 4 and a locking nut 5. Both ends of the pull rod 4 are provided with external threads, and the first sealing cover 1 and the second sealing cover 2 are both provided with pull rod mounting holes. Both ends of the pull rod 4 are respectively threaded through the corresponding pull rod mounting holes and threadedly connected with the locking nut 5. In the embodiment, three first pull rod mounting holes 1c are arranged on the groove bottom of the first sealing cover 1 in a circumferentially uniform manner, and three second pull rod mounting holes 2c are arranged on the groove bottom of the second sealing cover 2 in a circumferentially uniform manner. The first pull rod mounting holes 1c and the second pull rod mounting holes 2c are symmetrically distributed and are adapted to the pull rod 4. Both ends of the three pull rods 4 are respectively threaded through the corresponding first pull rod mounting holes 1c and second pull rod mounting holes 2c and threadedly connected with the corresponding locking nuts 5. The three pull rods 4 are arranged in a circumferentially uniform manner, thereby improving the connection reliability between the first sealing cover 1 and the second sealing cover 2. The locking nut 5 is provided with a pull rod sealing ring 20 and a gasket 21 between the first sealing cover 1 and the second sealing cover 2, respectively. Each pull rod sealing ring 20 is located on the side of the corresponding gasket 21 close to the first sealing cover 1 and the second sealing cover 2. The pull rod sealing ring 20 and the gasket 21 improve the sealing between the first sealing cover 1, the second sealing cover 2 and the pull rod 4. By tightening each locking nut 5, the connection between the first sealing cover 1, the second sealing cover 2 and the extrusion cylinder A, and the connection between the first sealing cover 1, the second sealing cover 2 and each pull rod 4 can be guaranteed to have good sealing performance. Each locking nut 5 is provided with a retreat stop screw 24, each retreat stop screw 24 is threadedly connected with a threaded hole on the corresponding locking nut 5 and can abut against the external thread of the corresponding pull rod 4. The retreat stop screw 24 further improves the connection reliability between the locking nut 5 and the pull rod 4.

[0032] As shown in Figure 1 and Figure 2 , the washing liquid circulating system comprises a water storage tank 11, an alkali storage tank 12, a circulating pipeline, a booster pump 13 and a power supply. The power supply is located in a power supply control cabinet 24 and can supply power to the booster pump 13, the heating device 9 and the temperature measuring device 10. The washing liquid circulating system is installed on a movable circulating system movable carriage 6, which is convenient for operators to move and has more flexible use scenarios. The water storage tank 11 and the alkali storage tank 12 are arranged in a stacked manner, thereby occupying less space.

[0033] The water storage tank 11 is provided with a water inlet 11a, and the alkali storage tank 12 is provided with an alkali inlet 12a; the circulating pipeline comprises a water conveying pipe 14, an alkali conveying pipe 15, a water draining pipe 16, a first connecting pipe 17, a second connecting pipe 18 and a third connecting pipe 19; the inlet end of the water conveying pipe 14 is communicated with the water outlet of the water storage tank 11, and the outlet end of the water conveying pipe 14 is communicated with the middle part of the first connecting pipe 17; the inlet end of the alkali conveying pipe 15 is communicated with the alkali outlet of the alkali storage tank 12, and the outlet end of the alkali conveying pipe 15 is communicated with the middle part of the first connecting pipe 17; the inlet end of the first connecting pipe 17 is communicated with the outlet end of the backflow pipe 8, the inlet end of the backflow pipe 8 is communicated with the liquid outlet 1b, and the outlet end of the first connecting pipe 17 is connected with the inlet of the booster pump 13; the inlet end of the second connecting pipe 18 is connected with the outlet of the booster pump 13, and the outlet end of the second connecting pipe 18 is communicated with the alkali return inlet of the alkali storage tank 12; the inlet end of the water draining pipe 16 is communicated with the middle part of the second connecting pipe 18, and the outlet end of the water draining pipe 16 is communicated with the sewage storage device; the inlet end of the third connecting pipe 19 is communicated with the middle part of the second connecting pipe 18, and the outlet end of the third connecting pipe 19 is communicated with the inlet end of the liquid supply pipe 7; the outlet end of the liquid supply pipe 7 is communicated with the liquid inlet 1a.

[0034] The water conveying pipe 14 is provided with a water outlet valve 14a at one end close to the water storage tank 11, and is provided with a water on-off valve 14b at one end close to the first connecting pipe 17; the first connecting pipe 17 is provided with a backflow valve 17a at one end close to the backflow pipe 8, and the backflow valve 17a is located between the backflow pipe 8 and the water conveying pipe 14; the alkali conveying pipe 15 is provided with an alkali outlet valve 15a at one end close to the alkali storage tank 12; the second connecting pipe 18 is provided with an alkali return valve 18a at one end close to the alkali storage tank 12; the water draining pipe 16 is provided with a water draining valve 16a; and the third connecting pipe 19 is provided with an outlet valve 19a.

[0035] The working process of the utility model is as follows:

[0036] 1, hoist extrusion cylinder A on extrusion cylinder support seat 23, move two sealing cover moving slide 3, to first sealing cover 1 and second sealing cover 2 are placed in the two sides of extrusion cylinder A respectively;

[0037] 2, three draw bars 4 are sequentially threaded through corresponding first draw bar mounting hole 1c, extrusion cylinder A and second draw bar mounting hole 2c, the both ends of each draw bar 4 are sequentially equipped with washer 21 and lock nut 5, and the side of washer 21 with draw bar sealing ring 20 is towards corresponding first sealing cover 1 or second sealing cover 2;

[0038] 3, tighten lock nut 5, ensure the sealing property between first sealing cover 1, second sealing cover 2 and extrusion cylinder A, and between first sealing cover 1, second sealing cover 2 and each draw bar 4.

[0039] 4. Connect the outlet end of the liquid supply pipe 7 to the inlet 1a, connect the inlet end of the return pipe 8 to the outlet 1b, and connect the overflow pipe 27 and the sewage pipe 25 to the waste pool or sewage bucket.

[0040] 5. See Figure 3 Alkali inlet and alkaline washing: Close the alkali return valve 18a, drain valve 26, reflux valve 17a, drain valve 16a, main outlet valve 14a, and outlet on / off valve 14b; open the alkali outlet valve 15a and outlet valve 19a. Start the booster pump 13 to inject the alkali solution into the extrusion cylinder A from the inlet 1a until a small amount overflows from the overflow pipe 27. Then close the alkali outlet valve 15a, outlet valve 19a, and booster pump 13. During the alkaline washing process, the temperature of the alkali solution is adjusted by the heating device 9 and the temperature measuring device 10 to achieve the best reaction effect with the residual aluminum on the inner wall of the extrusion cylinder A.

[0041] 6. See also Figure 4 Draining alkaline solution: After about 30 hours of alkaline washing, open the alkali return valve 18a and the reflux valve 17a, start the booster pump 13, and the alkaline solution will be discharged from the outlet 1b and flow to the alkali storage tank 12.

[0042] 7. See also Figure 5 To remove residues: Close the alkali return valve 18a and the reflux valve 17a, open the main outlet valve 14a, the outlet on / off valve 14b, the outlet valve 19a and the drain valve 26, start the booster pump 13, and clean water enters the squeezing cylinder A, carrying the residue, residual alkali and chemical reactants from the inner wall of the squeezing cylinder A out of the drain outlet 2a, and then discharged into the waste pool or drain bucket through the drain pipe 25;

[0043] 8. See also Figure 6 Rinse with clean water: Close the drain valve 26, start the booster pump 13, and inject clean water into the squeezing cylinder A until a small amount overflows from the overflow pipe 27.

[0044] 9. See also Figure 7 Rinsing and draining wastewater: Open the return valve 17a and drain valve 16a to discharge the rinsed wastewater into the wastewater tank or wastewater bucket, thus completing one rinse of the inner wall of the extrusion cylinder A. Repeat the rinsing process several times to complete the cleaning of the inner wall of the extrusion cylinder A.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A device for alkaline washing and rinsing of an extrusion barrel, characterized in that: The alkali washing and rinsing tool comprises a first sealing cover and a second sealing cover which are oppositely arranged and are respectively installed on corresponding sealing cover moving carriages, the first sealing cover and the second sealing cover can be connected through a locking assembly, the locking assembly comprises at least one pull rod, both ends of the pull rod can lock the first sealing cover and the second sealing cover at both ends of the extrusion cylinder through locking nuts which are screwed with the first sealing cover and the second sealing cover, so as to block the openings at both ends of the extrusion cylinder, the first sealing cover is provided with a liquid inlet and a liquid outlet, and the second sealing cover is provided with a sewage outlet. The washing liquid circulating system is installed on a movable circulating system moving carriage, the outlet end of the liquid supply pipe of the washing liquid circulating system is communicated with the liquid inlet, the inlet end of the return pipe of the washing liquid circulating system is communicated with the liquid outlet, the washing liquid circulating system can inject alkali or clean water into the liquid inlet through the liquid supply pipe, and the washing liquid circulating system can recover the alkali or sewage flowing out of the liquid outlet through the return pipe. The first sealing cover and the second sealing cover are both provided with heating devices, the heating ends of the heating devices are located between the first sealing cover and the second sealing cover, and the heating joints of the heating devices are respectively located on the sides of the first sealing cover and the second sealing cover which are away from each other.

2. The alkaline washing and rinsing integrated device for extrusion barrel according to claim 1, characterized in that: The first sealing cover and / or the second sealing cover are provided with temperature measuring devices, the temperature measuring probes of the temperature measuring devices are located between the first sealing cover and the second sealing cover, and the temperature measuring joints of the temperature measuring devices are located on the sides of the first sealing cover or the second sealing cover which are away from the extrusion cylinder. The top of the second sealing cover is provided with an overflow port.

3. The integrated caustic washing and rinsing device for extrusion barrel according to claim 1, characterized in that: The first sealing cover and the second sealing cover are both in the form of a cylindrical groove, the groove ends of the first sealing cover and the second sealing cover are both directed to each other, a plurality of first pull rod mounting holes which are uniformly distributed in a circumferential direction are formed in the groove bottom of the first sealing cover, a plurality of second pull rod mounting holes which are uniformly distributed in a circumferential direction are formed in the groove bottom of the second sealing cover, the first pull rod mounting holes and the second pull rod mounting holes are symmetrically distributed and are matched with the pull rods, and both ends of each pull rod respectively pass through the corresponding first pull rod mounting hole and the second pull rod mounting hole.

4. The alkaline cleaning and rinsing integrated device for extrusion barrel according to claim 1, characterized in that: The sides of the groove walls of the first sealing cover and the second sealing cover which are close to each other are respectively provided with annular clamping grooves which are matched with the corresponding ends of the extrusion cylinder, and sealing rings of the sealing covers are embedded in the annular clamping grooves.

5. The integrated caustic wash and rinse device of claim 4, wherein: The locking nuts and the corresponding first sealing cover and the second sealing cover are provided with pull rod sealing rings and gaskets, and each pull rod sealing ring is located on the side of the corresponding gasket which is close to the first sealing cover and the second sealing cover.

6. The integrated caustic washing and rinsing device of claim 1 or 4, wherein: Extrusion cylinder support seats for supporting the extrusion cylinder are arranged between the two sealing cover moving carriages.

7. The integrated caustic washing and rinsing device of claim 1, wherein: Each locking nut is provided with a retreat stop screw which is screwed with the threaded hole on the corresponding locking nut and can abut against the external thread of the corresponding pull rod.

8. The integrated caustic wash and rinse device of claim 1, wherein: The washing liquid circulating system comprises a water storage tank, an alkali storage tank, a circulating pipeline, a booster pump and a power supply for the booster pump.

9. The integrated caustic wash and rinse device of claim 1, wherein: ​ The water storage tank is provided with a water inlet, the alkali storage tank is provided with an alkali inlet, the circulation pipeline comprises a water delivery pipe, an alkali delivery pipe, a drain pipe, a first connecting pipe, a second connecting pipe and a third connecting pipe, the inlet end of the water delivery pipe is communicated with the water outlet of the water storage tank, and the outlet end of the water delivery pipe is communicated with the middle part of the first connecting pipe; the inlet end of the alkali delivery pipe is communicated with the alkali outlet of the alkali storage tank, and the outlet end of the alkali delivery pipe is communicated with the middle part of the first connecting pipe; the inlet end of the first connecting pipe is communicated with the outlet end of the backflow pipe, and the outlet end of the first connecting pipe is connected with the inlet of the booster pump; the inlet end of the second connecting pipe is connected with the outlet of the booster pump, and the outlet end of the second connecting pipe is communicated with the alkali return inlet of the alkali storage tank; the inlet end of the drain pipe is communicated with the middle part of the second connecting pipe, and the outlet end of the drain pipe is communicated with the sewage storage device; the inlet end of the third connecting pipe is communicated with the middle part of the second connecting pipe, and the outlet end of the third connecting pipe is communicated with the inlet end of the liquid supply pipe; The water delivery pipe is provided with a water outlet valve near the water storage tank, and the water delivery pipe is provided with a water on-off valve near the first connecting pipe; the first connecting pipe is provided with a backflow valve near the backflow pipe; the alkali delivery pipe is provided with an alkali outlet valve near the alkali storage tank; the second connecting pipe is provided with an alkali return valve near the alkali storage tank; the drain pipe is provided with a drain valve; and the third connecting pipe is provided with an outlet valve.

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