Overflow washing water recovery device of electrochromism roughening washing water tank

Abstract

The utility model relates to an overflow washing water recovery device for an electrochromism roughening washing water tank. Comprising a cleaning and transferring device, a filtering device, a reverse osmosis device, a reverse osmosis membrane cleaning device, a collecting device and an activated carbon cleaning device which are connected in sequence. The control valves installed in the pipelines are all electromagnetic valves, the valves are electrically connected with a PLC control circuit, and the installed common valves are all ball valves. The utility model provides an overflow washing water recovery device for a plastic electroplating chromium roughening washing water tank, which reduces resource waste, effectively removes impurities such as organic matters, suspended matters and metal ions in overflow water, recovers useful water resources, reduces the use cost of water, and improves the recovery rate by adopting a concentrated water secondary treatment mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of electroplating waste liquid treatment, and particularly relates to an overflow washing water recovery device for a plastic electroplating chromium roughening washing water tank. Background Art

[0002] Chromic anhydride and sulfuric acid are often used for electroplating in various plastic and metal chromium electroplating processing industries. Among them, plastic electroplating is mainly used for the treatment of the surface of plastic products, which can improve their appearance, texture, wear resistance and corrosion resistance. Plastic electroplating technology is widely used in automotive parts, home appliances, digital products and other fields, so there is a broad market space for waste liquid recycling in the plastic electroplating industry. Plastic electroplating roughening mainly uses chromic anhydride (400-430g / L) and sulfuric acid (380-420g / L) to corrode plastic parts. During production, after passing through the roughening tank, it will enter the reuse tank and the water stop tank for cleaning, and then enter the stepped overflow cleaning tank for further cleaning. Continuous spray cleaning is required during the overflow cleaning process, and the cleaning tank needs to be equipped with an overflow water outlet. A large amount of cleaning water will overflow during production. After reaching a certain concentration, the reuse tank directly returns to the roughing tank for reuse. The water stop tank enters the chromic acid reuse process for reuse and then returns to the roughing tank. The overflow cleaning tank will produce overflow water with different concentrations. These overflow waters mainly contain chromic anhydride and sulfuric acid, as well as a small amount of trivalent chromium and organic matter. However, the chromium content of the overflow water does not reach the concentration required for entering the reuse process. Since a large amount of overflow water will be discharged, if it is not recycled, it will cause a waste of water resources and increase the processing burden of the water station. Therefore, the overflow washing water recovery and treatment system is used to recycle water resources and chromic acid resources. Utility Model Content

[0003] The utility model aims to provide a plastic electroplating chrome roughening washing tank overflow washing water recovery device which reduces resource waste, effectively removes impurities such as organic matter, suspended matter and metal ions in overflow water, recovers useful water resources, reduces the cost of water use, and adopts a concentrated water secondary treatment method to improve the recovery rate.

[0004] The technical solution of the utility model is the overflow washing water recovery device of the electroplating chrome roughening washing tank, which is special in that it includes a cleaning and transfer device, a filtering device, a reverse osmosis device, a reverse osmosis membrane cleaning device, a collecting device, and an activated carbon cleaning device connected in sequence.

[0005] Preferably: the cleaning device and the transfer device include a first-level overflow cleaning tank, a second-level overflow cleaning tank, a third-level overflow cleaning tank and an overflow water transfer barrel that are interconnected, which are used for spraying and washing the plated parts and collecting the overflow water for reuse. The pipeline connecting the third-level overflow cleaning tank and the water inlet of the overflow water transfer barrel is provided with a second control valve, and a bypass pipeline first control valve is provided; a first high and low liquid level sensor is provided in the overflow water transfer barrel, and a first common valve, a centrifugal pump, a check valve and a third control valve are provided in the pipeline connected to the first-level bag filter of the filtering device. When the liquid level is detected to be higher than the high level, the first control valve is opened and the second control valve is closed. When the liquid level is detected to be lower than the low level, an alarm is triggered and the third control valve and the centrifugal pump are closed.

[0006] As a preference: the filtering device comprises a first-stage bag filter, a second-stage activated carbon filter, a third-stage bag filter and a wastewater storage barrel connected in sequence, which are used to remove organic matter, remove impurities and store overflow wash water after pretreatment; the first-stage bag filter is provided with a third pressure gauge, the second-stage activated carbon filter is provided with a first pressure gauge, the third-stage bag filter is provided with a second pressure gauge, the first-stage bag filter and the second-stage activated carbon filter are connected on the pipeline, the second-stage activated carbon filter and the third-stage bag filter are connected on the pipeline, and the fourth control valve is provided on the pipeline, and the outlet of the third-stage bag filter is connected to the wastewater storage tank. A barrel, a second common valve is provided on its connecting pipeline; a second high and low liquid level sensor is provided in the wastewater storage barrel; the overflow water passes through the first-stage bag filter, the second-stage activated carbon filter and the third-stage bag filter in sequence and enters the wastewater storage barrel; when the pressure values ​​of the third pressure gauge and the second pressure gauge exceed 0.5 MPa, the consumables therein are replaced; when the pressure values ​​of the pressure gauges exceed 1 MPa, the cleaning system of the activated carbon filter is started; when the liquid level in the wastewater storage barrel reaches a high liquid level under the detection of the high and low liquid level sensors, an alarm is sounded and the third control valve is closed; when the low liquid level is reached, the eighth control valve and the reverse osmosis pressure pump are closed.

[0007] Preferably: the reverse osmosis device includes a reverse osmosis pressure pump and a reverse osmosis membrane main unit; the water inlet of the reverse osmosis pressure pump is connected to the water outlet at the bottom of the wastewater storage barrel and a sixth control valve is installed on the connected pipeline, the water outlet of the reverse osmosis pressure pump is connected to the water inlet of the reverse osmosis membrane main unit and a first check valve and a seventh control valve are installed on the connected pipeline, the top water inlet is connected to the water outlet of the reverse osmosis membrane main unit cleaning agent, and the water outlet pipeline is provided with a fifth common valve and a ninth control valve, the reverse osmosis membrane main unit is equipped with a reverse osmosis membrane, and one side is provided with an integrated automatic control system and a display panel for displaying the liquid level of each liquid level sensor and the pressure value of each pressure gauge, as well as automatically controlling the activated carbon filter cleaning device, the reverse osmosis membrane cleaning device and the concentrated water secondary reuse program, and there is a manual control button.

[0008] As a preferred embodiment: the collection device includes a concentrated water collection bucket and a recycled water collection bucket; the top water inlet of the recycled water collection bucket is connected to the recycled water outlet of the reverse osmosis machine, and the connecting pipeline is provided with a third common valve, and the recycled water collection bucket is provided with a fifth high liquid level sensor, and the sensed water level value is displayed on the reverse osmosis machine control panel; the concentrated water collection bucket is provided with a fourth high and low liquid level sensor, the top water inlet is connected to the concentrated water outlet of the reverse osmosis membrane host, the connecting pipeline is provided with a fourth common valve, a tenth control valve, and a thirteenth control valve, and the bottom water outlet is connected to the water inlet of the reverse osmosis pressure pump, and the connecting pipeline is provided with There are a seventh common valve and a twelfth control valve. When the liquid level in the concentrated water collection barrel reaches the high liquid level under the detection of the fourth high, medium and low liquid level sensors, the tenth control valve is opened, the thirteenth control valve is closed, the twelfth control valve is opened, and the sixth control valve is closed, and the concentrated water reuse program is switched to run; when the liquid level in the concentrated water collection barrel is lower than the low liquid level under the detection of the fourth high, medium and low liquid level sensors, the seventeenth control valve is opened, the tenth control valve is closed, the sixth control valve is opened, and the twelfth control valve is closed, and the overflow wastewater reuse program is switched to run, and the outlet of the pipeline where the tenth control valve is located is connected to the chromic acid reuse system.

[0009] Preferably: the activated carbon filter cleaning device comprises a desorption circulation pump and an activated carbon cleaning agent storage barrel; the water inlet of the desorption circulation pump is connected to the water outlet at the bottom of the activated carbon cleaning agent storage barrel and an eighth common valve is installed in the connected pipeline, the water outlet of the desorption circulation pump is connected to the cleaning agent water inlet at the top of the activated carbon filter and a third check valve and a fourteenth control valve are installed in the connected pipeline, a sixth high and medium liquid level sensor is arranged in the activated carbon cleaning agent storage barrel, when it is detected that the liquid level is lower than the medium level, an alarm is issued and the fourteenth control valve and the desorption circulation pump are closed; when the pressure gauge value is higher than 1 MPa, the reverse osmosis membrane host control panel issues an alarm to start the activated carbon cleaning program, close the third control valve, the centrifugal pump, the third control valve, the fourth control valve, open the fourteenth control valve and the fifth control valve, and start the cyclic desorption until the pressure gauge value is lower than 0.5 MPa.

[0010] As a preference, the control valves installed in the pipelines are all solenoid valves, the valves are electrically connected to the PLC control circuit, and the ordinary valves installed are all ball valves.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] ⑴ The overflow wash water described in the utility model is preliminarily purified through a three-stage filter, so that organic matter and suspended matter in the wastewater can be preliminarily removed, and then the metal ions are separated and the remaining soluble impurities are deeply removed through a reverse osmosis device. The concentrated water generated by the overflow water treated by the reverse osmosis device is collected and then osmotic recovered again, and the concentrated water generated for the second time enters the chromic acid reuse process for chromic acid recovery. The utility model can achieve a reuse water ion removal rate of 98.5-99.5%, and the chromium resource recovery rate after combining the chromic acid reuse process is 95-98%, and the comprehensive water production rate can reach 75-80%, which can minimize resource waste.

[0013] (2) The concentrated water produced by the overflow water treated by the reverse osmosis device of the utility model is collected and then recycled again by osmosis, and the concentrated water produced for the second time enters the chromic acid recycling process for chromic acid recovery.

[0014] ⑶ The utility model can achieve a water ion removal rate of 98.5-99.5% for recycled water. The chromium resource recovery rate is 95-98% after combining with the chromic acid recycling process, and the comprehensive water production rate can reach 75-80%, which can minimize resource waste.

[0015] (4) The overflow water recovery and treatment system of the plastic electroplating chromium roughening washing tank provided by the utility model can effectively remove impurities such as organic matter, suspended matter and metal ions in the overflow water, recover useful water resources, reduce the cost of water use, and adopt a secondary treatment method of concentrated water to improve the recovery rate, achieving better social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model of the overflow washing water recovery device of the plastic electroplating chrome roughening washing water tank;

[0017] Figure 2 The utility model is a flow chart of a control method of an overflow washing water recovery device of a plastic electroplating chrome roughening washing water tank.

[0018] Main component symbols:

[0019] Cleaning transfer device 1 Primary overflow cleaning tank 11 Secondary overflow cleaning tank 12 Three-stage overflow cleaning tank 13 First control valve 131 Second control valve 132 Overflow water transfer barrel 14 First high and low liquid level sensor 141 Centrifugal pump 15 The third control valve 151 Check valve 152 First common valve 153 Filter 2 Secondary activated carbon filter 21 First pressure gauge 211 Fourth control valve 212 Fifth control valve 213 Three-stage bag filter 22 Second pressure gauge 221 Fifteenth control valve 222 Sixteenth control valve 223 Wastewater storage barrel 23 Second high and low liquid level sensor 231 Sixth control valve 232 Primary bag filter 24 The third pressure gauge 241 Seventh control valve 242 Reverse osmosis device 3 Reverse osmosis pressure pump 31 First check valve 311 Eighth control valve 312 Reverse osmosis membrane host 32 The third common valve 321 Fourth common valve 322 Fifth common valve 323 Ninth control valve 324 Tenth control valve 325 Seventeenth control valve 326 Reverse osmosis membrane 327 Display panel 328 Manual control button 329 Reverse osmosis membrane cleaning device 4 Reverse osmosis membrane cleaning agent storage tank 41 The third high and low liquid level sensor 411 Sixth common valve 412 Cleaning circulation pump 42 Second check valve 421 Eleventh control valve 423 Collection device 5 Concentrated water collection barrel 51 Fourth high, medium and low liquid level sensor 511 Twelfth control valve 512 Seventh common valve 513 Thirteenth control valve 514 Recycled water collection barrel 52 Fifth high, medium and low liquid level sensor 521 Activated carbon cleaning device 6 Activated carbon cleaning agent storage barrel 61 Sixth High School Liquid Level Sensor 611 Desorption circulation pump 62 Fourteenth control valve 621 The third check valve 622 Second common valve 623 DETAILED DESCRIPTION

[0020] The utility model will be further described below in conjunction with the accompanying drawings:

[0021] See also Figure 1As shown, the overflow washing water recovery and treatment system of the plastic electroplating chrome roughening washing tank includes a cleaning and transfer device 1, a filtration system 2, a reverse osmosis device 3, a reverse osmosis membrane cleaning device 4, a collection device 5 and an activated carbon cleaning device 6 which are connected in sequence. The cleaning device and transfer device 1 include a primary overflow cleaning tank 11, a secondary overflow cleaning tank 12, a tertiary overflow cleaning tank 13 and an overflow water transfer barrel 14, which are used for spraying and washing the plated parts and collecting the overflow water for reuse. The pipeline connecting the third-stage overflow cleaning tank 13 and the water inlet of the overflow water transfer barrel 14 is provided with a second control valve 132, and a bypass pipeline first control valve 131 is provided; a first high and low liquid level sensor 141 is provided in the overflow water transfer barrel 14, and a first common valve 153, a centrifugal pump 15, a check valve 152 and a third control 151 are provided in the pipeline connected to the primary filter bag filter 24. When it is detected that the liquid level is higher than the high level, the first control valve 131 is opened and the second control valve 132 is closed. When it is detected that the liquid level is lower than the low level, an alarm is issued to remind and the third control valve 151 and the centrifugal pump 15 are closed.

[0022] The filtering system 2 includes a three-stage filter and a wastewater storage device. The specific embodiment shown in the figure is a primary bag filter 24, a secondary activated carbon filter 21, a tertiary bag filter 22 and a wastewater storage barrel 23, which are used to remove organic matter, remove impurities and store overflow wash water after pretreatment. The primary bag filter 24 is provided with a third pressure gauge 241, the secondary activated carbon filter 21 is provided with a first pressure gauge 211, and the tertiary bag filter 22 is provided with a second pressure gauge 221. The three-stage filters are connected in series in sequence, and the connecting pipelines are provided with a seventh control valve 242 and a seventh control valve 212. The outlet of the tertiary bag filter 22 is connected to the wastewater storage barrel 23, and the connecting pipelines are provided with a fifteenth control valve 222 and a sixteenth control valve 223. The wastewater storage barrel is provided with a second high and low liquid level sensor 231. The overflow water passes through the primary bag filter 24, the secondary activated carbon filter 21 and the tertiary bag filter 22 in sequence and enters the wastewater storage barrel 23. When the pressure value of the third pressure gauge 241 and the second pressure gauge 221 exceeds 0.5 MPa, the consumables are replaced. When the pressure value of the second pressure gauge 221 exceeds 1 MPa, the cleaning system of the activated carbon filter 21 is started. When the liquid level in the wastewater storage barrel 23 reaches the high liquid level under the detection of the second high and low liquid level sensor 231, an alarm is issued and the third control valve 151 is closed. When the low liquid level is reached, the eighth control valve 312 and the reverse osmosis pressure pump 31 are closed. The three-stage filter in the filtration system 2 is the security filter of the reverse osmosis device 3, which mainly protects the membrane and the pump and intercepts the particles larger than 1 μm.

[0023] Please see again Figure 1The reverse osmosis device 3 and the reverse osmosis membrane cleaning device 4 include a reverse osmosis pressure pump 31, a reverse osmosis membrane host 32, a reverse osmosis membrane cleaning agent storage barrel 41, and a cleaning circulation pump 42; the water inlet of the reverse osmosis pressure pump 31 is connected to the water outlet at the bottom of the wastewater storage barrel 23 and a sixth control valve 232 is installed in the connected pipeline, the water outlet of the reverse osmosis pressure pump 31 is connected to the water inlet of the reverse osmosis membrane host 32 and a first check valve 311 and an eighth control valve 312 are installed in the connected pipeline, the water inlet of the cleaning circulation pump 42 is connected to the water outlet at the bottom of the reverse osmosis membrane cleaning agent storage barrel 41 and a sixth common valve 412 is installed in the connected pipeline, the water outlet of the cleaning circulation pump 42 is connected to the water inlet of the reverse osmosis membrane host 32 and a second check valve 421 and an eleventh control valve 42 are installed in the connected pipeline 3. The seventeenth control valve 326. The reverse osmosis membrane cleaning agent storage barrel 41 is provided with a third high and low liquid level sensor 411. When it is detected that the liquid level is lower than the low level, an alarm is issued to remind and close the eleventh control valve 423 and the cleaning circulation pump 42. When it is detected that the liquid level is higher than the high water level, an alarm is issued. The top water inlet is connected to the cleaning agent outlet of the reverse osmosis membrane host 32. The connecting pipeline is provided with a fifth common valve 323 and a ninth control valve 324. The reverse osmosis membrane host is equipped with a reverse osmosis membrane 327. On the right side, there is an integrated automatic control system and a display panel 328 for displaying the liquid level of each liquid level sensor and the pressure value of each pressure gauge, as well as automatically controlling the activated carbon filter cleaning device 5, the reverse osmosis membrane cleaning device 4 and the concentrated water secondary reuse program, and there is a manual control button 329.

[0024] Please see again Figure 1The collecting device 5 comprises a concentrated water collecting barrel 51 and a recycled water collecting barrel 52; the top water inlet of the recycled water collecting barrel 52 is connected to the recycled water outlet of the reverse osmosis machine 32, and the connecting pipeline is provided with a third common valve 321; the recycled water collecting barrel 52 is provided with a fifth high liquid level sensor 521, and the sensed water level value is displayed on the control panel of the reverse osmosis machine 32; the concentrated water collecting barrel 51 is provided with a fourth high and low liquid level sensor 511, the top water inlet is connected to the concentrated water outlet of the reverse osmosis membrane host 32, the connecting pipeline is provided with a fourth common valve 322, a tenth control valve 325, and a thirteenth control valve 514, the bottom water outlet is connected to the water inlet of the reverse osmosis pressure pump 31, and the connecting pipeline is provided with a seventh common valve 325. Valve 513 and the twelfth control valve 512. When the liquid level in the concentrated water collection barrel 51 reaches the high liquid level under the detection of the fourth high, medium and low liquid level sensors 511, the tenth control valve 325 is opened, the thirteenth control valve 514 is closed, the twelfth control valve 512 is opened, and the sixth control valve 232 is closed, and the concentrated water reuse program is switched to run. When the liquid level in the concentrated water collection barrel 51 is lower than the low liquid level under the detection of the fourth high, medium and low liquid level sensors 511, the seventeenth control valve 326 is opened, the tenth control valve 325 is closed, the sixth control valve 232 is opened, and the twelfth control valve 512 is closed, and the overflow wastewater reuse program is switched to run. The outlet of the pipeline where the tenth control valve 325 is located is connected to the chromic acid reuse system.

[0025] Please see again Figure 1 The activated carbon filter cleaning device 5 includes a desorption circulation pump 62 and an activated carbon cleaning agent storage barrel 61; the water inlet of the desorption circulation pump 62 is connected to the water outlet at the bottom of the activated carbon cleaning agent storage barrel 61 and a second common valve 623 is installed in the connected pipeline; the water outlet of the desorption circulation pump 62 is connected to the cleaning agent water inlet at the top of the activated carbon filter 211 and a third check valve 622 and a fourteenth control valve 621 are installed in the connected pipeline; the activated carbon cleaning agent storage barrel 61 is provided with a sixth high and middle liquid level sensor 611 When it is detected that the liquid level is lower than the medium level, an alarm will be issued and the fourteenth control valve 621 and the desorption circulation pump 62 will be closed; when the value of the pressure gauge 211 is higher than 1 MPa, the reverse osmosis membrane host control panel 328 will issue an alarm to start the activated carbon cleaning program, close the third control valve 151, the centrifugal pump 15, the seventh control valve 242, and the fourth control valve 212, open the fourteenth control valve 621 and the fifth control valve 213, and start the cyclic desorption until the pressure gauge value is lower than 0.5 MPa. For details, please refer to the automatic control operation steps.

[0026] The control valves installed in the above-mentioned pipelines (pipelines) of the utility model are all solenoid valves, the valves are electrically connected to the PLC control circuit, and the installed common valves are all ball valves.

[0027] See also Figure 2As shown, the control method of the overflow washing water recovery device of the plastic electroplating chrome roughening washing water tank comprises the following steps:

[0028] ⑴The system is powered on and started;

[0029] (2) Detecting data of the first high and low liquid level sensor 141;

[0030] (2.1) Determine whether the liquid level is higher than the high liquid level. If so, open the first control valve 131, close the second control valve 132, and return to step (2); if not, close the first control valve 131, open the second control valve 132, and return to step (2);

[0031] (2.2) Determine whether the liquid level is lower than the low liquid level. If so, close the third control valve 151, turn on the centrifugal pump 15, wait for 15 minutes and then return to step (2); if not, proceed to the next step (3);

[0032] (3) Detect the data of the third pressure gauge 241 and the second pressure gauge 221;

[0033] (4) Detecting the data of the first pressure gauge 211;

[0034] (4.1) Determine whether the pressure exceeds the standard. If so, open the desorption circulation pump 62, the fourteenth control valve 621, the fifth control valve 213 and close the third control valve 151 and the centrifugal pump 15. After the activated carbon circulation desorption system works for 30 minutes, return to step (4); if not, open the centrifugal pump 15, the third control valve 151, the fourth control valve 212, and the seventh control valve 242; the circulating desorption liquid in the activated carbon circulation desorption system is an aqueous solution containing sodium hypochlorite and sodium hydroxide, the concentration of sodium hypochlorite is 1-3%, and the concentration of sodium hydroxide is 3-5%;

[0035] (5) Detecting the data of the second high and low liquid level sensor 231;

[0036] (5.1) Determine whether the liquid level is higher than the high liquid level. If so, close the sixteenth control valve 223, open the second common valve 222, and return to step (5); if not, close the second common valve 222, open the sixteenth control valve 223, and return to step (5);

[0037] (5.2) Determine whether the liquid level is lower than the low liquid level. If so, close the reverse osmosis pressure pump 31 and the eighth control valve 312, wait for 20 minutes and then return to step (5); if not, proceed to the next step (6);

[0038] (6) Detect the pressure data of the reverse osmosis host 32;

[0039] (6.1) Determine whether the pressure exceeds the standard. If so, close the reverse osmosis pressure pump 31, the third common valve 321, the thirteenth control valve 514, the eighth control valve 312, and open the cleaning circulation pump 42, the seventeenth control valve 326, and the ninth control valve 324. The reverse osmosis membrane circulation cleaning system works for 30 minutes and returns to step (6). If not, close the cleaning circulation pump 42, the seventeenth control valve 326, and the ninth control valve 324, and open the reverse osmosis pressure pump 31, the third common valve 321, the thirteenth control valve 514, and the eighth control valve 312. The circulating cleaning liquid in the reverse osmosis membrane circulation cleaning system is an aqueous solution containing sodium hypochlorite and sodium hydroxide, the sodium hypochlorite concentration is 1-3%, the sodium hydroxide concentration is 5-7%, and 0.0001-0.0006% of a scale inhibitor is added.

[0040] ⑺Operate the reverse osmosis recovery device;

[0041] (8) Detecting the data of the fourth high and low liquid level sensor 511;

[0042] (8.1) Determine whether the liquid level is higher than the high liquid level. If not, return to step (7); if yes, close the sixth control valve 232 and the thirteenth control valve 514, open the twelfth control valve 512 and the tenth control valve 325, and proceed to the next step (9);

[0043] ⑼Operate the concentrated water recovery device;

[0044] ⑽Detecting the data of the fourth high and low liquid level sensor 511;

[0045] (10.1) Determine whether the liquid level is lower than the low liquid level. If not, return to step (9); if yes, close the twelfth control valve 512 and the tenth control valve 325, open the sixth control valve 232 and the thirteenth control valve 514, and return to step (6);

[0046] ⑾ The recycled water produced by the system will be stored in the recycled water collection tank 52.

[0047] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

1. A chromium electroplating roughening washing tank overflow washing water recovery device, characterized in that: The utility model comprises a cleaning and transfer device, a filtering device, a reverse osmosis device, a reverse osmosis membrane cleaning device, a collecting device and an activated carbon cleaning device which are connected in sequence.

2. The overflow water recovery device for the electroplating chromium roughening washing tank according to claim 1 is characterized in that: The cleaning device and transfer device include a first-level overflow cleaning tank, a second-level overflow cleaning tank, a third-level overflow cleaning tank and an overflow water transfer barrel that are interconnected, and are used for spraying and washing the plated parts and collecting the overflow water for reuse. The pipeline connecting the third-level overflow cleaning tank and the water inlet of the overflow water transfer barrel is provided with a second control valve, and a first control valve of a bypass pipeline is provided; a first high and low liquid level sensor is provided in the overflow water transfer barrel, and a first common valve, a centrifugal pump, a check valve and a third control valve are provided in the pipeline connected to the first-level bag filter of the filtering device. When it is detected that the liquid level is higher than the high level, the first control valve is opened and the second control valve is closed. When it is detected that the liquid level is lower than the low level, an alarm is triggered and the third control valve and the centrifugal pump are closed.

3. The overflow washing water recovery device of the electroplating chromium roughening washing tank according to claim 1 is characterized in that: The filtering device comprises a first-stage bag filter, a second-stage activated carbon filter, a third-stage bag filter and a wastewater storage barrel which are connected in sequence, and is used for removing organic matter, removing impurities and storing overflow washing water after pretreatment; a third pressure gauge is provided on the first-stage bag filter, a first pressure gauge is provided on the second-stage activated carbon filter, a second pressure gauge is provided on the third-stage bag filter, a seventh control valve is provided on the connecting pipeline between the first-stage bag filter and the second-stage activated carbon filter, a fourth control valve is provided on the connecting pipeline between the second-stage activated carbon filter and the third-stage bag filter, and a water outlet of the third-stage bag filter is connected to the wastewater storage barrel, wherein A second common valve is provided on the connecting pipeline; a second high and low liquid level sensor is provided in the wastewater storage barrel; the overflow water enters the wastewater storage barrel through the first-stage bag filter, the second-stage activated carbon filter and the third-stage bag filter in sequence; when the pressure values ​​of the third pressure gauge and the second pressure gauge exceed 0.5 MPa, the consumables are replaced; when the pressure values ​​of the pressure gauges exceed 1 MPa, the cleaning system of the activated carbon filter is started; when the liquid level in the wastewater storage barrel reaches a high liquid level under the detection of the high and low liquid level sensors, an alarm is sounded and the third control valve is closed; when the low liquid level is reached, the eighth control valve and the reverse osmosis pressure pump are closed.

4. The overflow washing water recovery device of the electroplating chromium roughening washing tank according to claim 1 is characterized in that: The reverse osmosis device includes a reverse osmosis pressure pump and a reverse osmosis membrane host; the water inlet of the reverse osmosis pressure pump is connected to the water outlet at the bottom of the wastewater storage barrel and a sixth control valve is installed on the connected pipeline; the water outlet of the reverse osmosis pressure pump is connected to the water inlet of the reverse osmosis membrane host and a first check valve and a seventh control valve are installed on the connected pipeline; the top water inlet is connected to the water outlet of the reverse osmosis membrane host cleaning agent, and the water outlet pipeline is provided with a fifth common valve and a ninth control valve; the reverse osmosis membrane host is equipped with a reverse osmosis membrane, and one side is provided with an integrated automatic control system and a display panel for displaying the liquid level of each liquid level sensor and the pressure value of each pressure gauge, as well as automatically controlling the activated carbon filter cleaning device, the reverse osmosis membrane cleaning device and the concentrated water secondary reuse program, and there is a manual control button.

5. The overflow washing water recovery device of the electroplating chromium roughening washing tank according to claim 1 is characterized in that: The collecting device comprises a concentrated water collecting barrel and a recycled water collecting barrel; the top water inlet of the recycled water collecting barrel is connected to the recycled water outlet of the reverse osmosis machine, the connecting pipeline is provided with a third common valve, the inside of the recycled water collecting barrel is provided with a fifth high liquid level sensor, and the sensed water level value is displayed on the reverse osmosis machine control panel; the concentrated water collecting barrel is provided with a fourth high and low liquid level sensor, the top water inlet is connected to the concentrated water outlet of the reverse osmosis membrane host, the connecting pipeline is provided with a fourth common valve, a tenth control valve, and a thirteenth control valve, the bottom water outlet is connected to the water inlet of the reverse osmosis pressure pump, and the connecting pipeline is provided with a seventh Ordinary valve, the twelfth control valve, when the liquid level in the concentrated water collection barrel reaches the high liquid level under the detection of the fourth high, medium and low liquid level sensors, open the tenth control valve, close the thirteenth control valve, open the twelfth control valve, close the sixth control valve, and switch to the concentrated water reuse program; when the liquid level in the concentrated water collection barrel is lower than the low liquid level under the detection of the fourth high, medium and low liquid level sensors, open the seventeenth control valve, close the tenth control valve, open the sixth control valve, close the twelfth control valve, and switch to the overflow wastewater reuse program. The outlet of the pipeline where the tenth control valve is located is connected to the chromic acid reuse system.

6. The overflow water recovery device for the electroplating chromium roughening washing tank according to claim 4 is characterized in that: The activated carbon filter cleaning device includes a desorption circulation pump and an activated carbon cleaning agent storage barrel; the desorption circulation pump water inlet is connected to the bottom water outlet of the activated carbon cleaning agent storage barrel and an eighth common valve is installed in the connected pipeline, the desorption circulation pump water outlet is connected to the top cleaning agent water inlet of the activated carbon filter and a third check valve and a fourteenth control valve are installed in the connected pipeline, and a sixth high and medium liquid level sensor is arranged in the activated carbon cleaning agent storage barrel. When it is detected that the liquid level is lower than the medium level, an alarm is issued to remind and close the fourteenth control valve and the desorption circulation pump; when the pressure gauge value is higher than 1 MPa, the reverse osmosis membrane host control panel issues an alarm to start the activated carbon cleaning program, close the third control valve, the centrifugal pump, the third control valve, the fourth control valve, open the fourteenth control valve and the fifth control valve, and start the cyclic desorption until the pressure gauge value is lower than 0.5 MPa.

7. The overflow water recovery device of the electroplating chromium roughening washing tank according to claim 2 or 3, characterized in that: The control valves installed in the pipelines are all solenoid valves, the valves are electrically connected to the PLC control circuit, and the ordinary valves installed are all ball valves.

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