Slurry recycling and circulating system of coating machine

Abstract

The utility model relates to a sizing agent recycling system of a coating machine, which comprises a die head and a sizing agent barrel, a conveying pipeline, a return pipeline and a recycling pipeline are arranged between the die head and the sizing agent barrel, sizing agent in the sizing agent barrel is conveyed to the die head through the conveying pipeline, and the sizing agent at the die head flows back to the sizing agent barrel through the return pipeline to form sizing agent circulation. A material receiving funnel is arranged under a lip mouth of the die head, slurry in the funnel is conveyed to a slurry barrel through a recovery pipeline, a first filter, a second filter and a jacket heat exchange pipe are sequentially arranged on a material conveying pipeline, and the slurry in the material conveying pipeline is filtered by the first filter and the second filter. The jacket heat exchange pipe is arranged in the outer circumferential direction of the material conveying pipeline in a sleeving mode so as to heat slurry in the material conveying pipeline. Circulation of slurry is achieved through the material conveying pipeline and the backflow pipeline; slurry recovery is realized through the recovery pipeline; and the slurry is kept at a stable temperature in the coating process through the jacket heat exchange tube, so that the coating quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery pole piece coating technology, especially relates to a coating machine pulp recycling system. BACKGROUND

[0002] In the production process of lithium battery pole piece coating, the slurry for coating is stored in a slurry barrel, and the slurry in the slurry barrel is gradually pumped to the die head to form a pole piece on the metal foil according to the progress of coating. The process of extruding the slurry from the lip of the die head will cause the slurry to drip. The dripped slurry is generally collected through a hopper and then transported to another transfer slurry barrel for recycling. When the transfer slurry barrel is full of slurry, it is transferred together. The whole process is time-consuming and laborious. At the same time, the process increases the time of the slurry exposed to the air. At the same time, the transfer slurry barrel is prone to residual slurry, which will affect the composition ratio of the recycled slurry. During the transfer process of the transfer slurry barrel, the pipeline needs to be disassembled, resulting in liquid leakage. Moreover, the solvent of the slurry is mostly NMP (N-methyl pyrrolidone), which has the characteristics of low toxicity. Personnel may be injured during the operation and handling process. Therefore, it is necessary to design a system for recycling the slurry of the coating machine, which is of great significance for promoting the sustainable development of the coating machine. SUMMARY

[0003] In order to solve the problems of the prior art, the utility model provides a coating machine slurry recycling system.

[0004] The utility model provides a coating machine slurry recycling system, including die head, slurry barrel, be provided with feed pipe line, backflow pipe line and recovery pipe line between die head and slurry barrel, the slurry in slurry barrel is transported to die head through feed pipe line, the slurry at die head is backflowed to slurry barrel through backflow pipe line and forms slurry circulation, the lip of die head is provided with the hopper of receiving material below, the slurry in the hopper is transported to slurry barrel through recovery pipe line, first filter, second filter and jacketed heat exchange pipe are sequentially provided on feed pipe line, first filter and second filter filter the slurry in feed pipe line, the jacketed heat exchange pipe is arranged on the outer circumferential direction of feed pipe line to heat the slurry in feed pipe line.

[0005] In some embodiments, the feed pipe line is provided with a temperature sensor between the jacketed heat exchange pipe and the die head.

[0006] In some embodiments, the feed pipe line is provided with a first pneumatic three-way ball valve near the die head, the feed pipe line is connected with the backflow pipe line through the first pneumatic three-way ball valve, the recovery pipe line is provided with a second pneumatic three-way ball valve near the die head, and the recovery pipe line is connected with the flange ball valve through the second pneumatic three-way ball valve.

[0007] In some embodiments, the feed pipe, the return pipe and the recovery pipe are provided with pressure transmitters.

[0008] In some embodiments, the recovery pipe is provided with a diaphragm pump and a Y-type filter, the diaphragm pump draws the slurry in the hopper into the recovery pipe, and the Y-type filter filters the slurry in the recovery pipe.

[0009] In some embodiments, the diaphragm pump is a pneumatic diaphragm pump.

[0010] In some embodiments, the feed pipe is provided with a screw pump, the screw pump draws the slurry in the slurry barrel into the feed pipe.

[0011] In some embodiments, a mounting platform is further included, the slurry barrel is fixed on the mounting platform through a first mounting bracket, the screw pump is arranged along the length direction of the mounting platform, the first filter is fixed on the mounting platform through a second mounting bracket, the second filter is fixed on the mounting platform through a third mounting bracket, and the diaphragm pump is fixed on the mounting platform through a fourth mounting bracket.

[0012] In some embodiments, a bracket is arranged outside the mounting platform, and the portions of the feed pipe, the return pipe and the recovery pipe outside the mounting platform are supported by the bracket.

[0013] In some embodiments, the first filter is a scraper filter, and the second filter is a bag filter.

[0014] Compared with the prior art, the slurry recycling and circulating system has the following beneficial effects: the slurry is circulated through the feed pipe and the return pipe, the slurry flow rate and pressure at the input die head can be stably controlled, the slurry in the hopper is drawn back into the slurry barrel through the recovery pipe, the slurry is recycled, the slurry in the feed pipe is heated or cooled through the jacketed heat exchange pipe to adjust the temperature of the slurry, the slurry transported to the die head maintains a stable temperature during the coating process, and the quality of the coating is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective structural schematic view of a slurry recycling and circulating system of a coating machine according to an embodiment of the present application.

[0016] Figure 2 is a top view structural schematic view of a slurry recycling and circulating system of a coating machine according to an embodiment of the present application.

[0017] Figure 3 is a side view structural schematic view of a slurry recycling and circulating system of a coating machine according to an embodiment of the present application.

[0018] Figure 4is a side view structural schematic diagram of a part of a coating machine slurry recycling system of an embodiment of the application.

[0019] Figure 5 is a side view structural schematic diagram of a die of an embodiment of the application.

[0020] Figure 6 is a plane structural schematic diagram of a diaphragm pump of an embodiment of the application.

[0021] Figure 7 is a slurry circulation schematic diagram of a coating machine slurry recycling system of an embodiment of the application.

[0022] Reference signs: 101, die; 102, slurry tank; 103, hopper; 104, lip;

[0023] 1, feed pipeline; 11, first filter; 12, second filter; 13, jacketed heat exchange pipe; 14, temperature sensor; 15, screw pump;

[0024] 2, return pipeline; 21, transparent ferroton pipe; 22, tee;

[0025] 3, recycling pipeline; 31, diaphragm pump; 32, Y-type filter;

[0026] 41, first pneumatic tee ball valve; 42, second pneumatic tee ball valve; 43, flange ball valve; 44, quick-mounting clamp;

[0027] 5, pressure transmitter;

[0028] 6, mounting platform; 61, first mounting bracket; 62, second mounting bracket; 63, third mounting bracket; 64, fourth mounting bracket; 65, bracket; 66, castor. DETAILED DESCRIPTION

[0029] The specific implementation manners of the present application are described with reference to the drawings.

[0030] Reference Figure 1 is a three-dimensional structural schematic diagram of a coating machine slurry recycling system, the left side is a mounting platform 6, and the right side is a die 101 of a coating machine. The mounting platform 6 centrally mounts a slurry tank 102, a first filter 11, a second filter 12, a jacketed heat exchange pipe 13, a Y-type filter 32, a screw pump 15, and a diaphragm pump 31. A feed pipeline 1 and a return pipeline 2 for circulating slurry are arranged between the slurry tank 102 and the die 101. A recycling pipeline 3 for recycling slurry in a hopper 103 below the die 101 is arranged to extract the slurry in the hopper 103 through the diaphragm pump 31.

[0031] Reference Figures 1 to 7The coating machine slurry recycling system comprises a die head 101, a slurry tank 102, a feeding pipeline 1, a backflow pipeline 2 and a recycling pipeline 3 arranged between the die head 101 and the slurry tank 102, the slurry in the slurry tank 102 is conveyed to the die head 101 through the feeding pipeline 1, the slurry at the die head 101 is backflowed to the slurry tank 102 through the backflow pipeline 2 to form slurry circulation, a hopper 103 for receiving slurry is arranged directly below a lip 104 of the die head 101, the slurry in the hopper 103 is conveyed to the slurry tank 102 through the recycling pipeline 3, a first filter 11, a second filter 12 and a jacketed heat exchange pipe 13 are sequentially arranged on the feeding pipeline 1, the first filter 11 and the second filter 12 filter the slurry in the feeding pipeline 1, and the jacketed heat exchange pipe 13 is arranged on the outer circumferential direction of the feeding pipeline 1 to heat the slurry in the feeding pipeline 1.

[0032] It should be further explained that, referring to Figure 5 , during the coating process, the die head 101 continuously extrudes slurry, and the slurry that is not coated on the metal foil falls into the hopper 103 below under the action of gravity, the hopper 103 continuously receives the slurry, and the slurry in the hopper 103 is recycled to the slurry tank 102 through the recycling pipeline 3, so that the slurry in the hopper 103 can be recycled, of course, a small part of the slurry in the hopper 103 will solidify due to contact with air, and the part of the slurry needs to be filtered before being conveyed to the slurry tank 102.

[0033] The coating machine slurry recycling system of the embodiment of the application realizes slurry circulation through the feeding pipeline 1 and the backflow pipeline 2, can stably control the slurry flow rate and pressure input to the die head 101, realizes slurry recycling by recycling the slurry in the hopper 103 to the slurry tank 102 through the recycling pipeline 3, and adjusts the temperature of the slurry by heating or cooling the slurry in the feeding pipeline 1 through the jacketed heat exchange pipe 13, so that the slurry conveyed to the die head 101 maintains a stable temperature during the coating process, thereby ensuring the coating quality.

[0034] In order to accurately control the heating of the slurry by the jacketed heat exchange pipe 13, in the embodiment, referring to Figure 1 , the feeding pipeline 1 is provided with a temperature sensor 14 between the jacketed heat exchange pipe 13 and the die head 101.

[0035] It can be understood that, thus arranged, the jacket heat exchange pipe 13 is sleeved on one of the straight pipes of the material conveying pipe 1 and is horizontally arranged, the length of the jacket heat exchange pipe 13 is proportional to the heat exchange time of the jacket heat exchange pipe 13 and the material conveying pipe 1, and a jacket heat exchange pipe 13 with a corresponding length is selected according to the actual situation. The length of the jacket heat exchange pipe 13 of the embodiment is longer than the horizontal installation span of the first filter 11 and the second filter 12. The jacket heat exchange pipe 13 uses water as the heat exchange medium, the jacket heat exchange pipe 13 is connected with the mold temperature controller, the mold temperature controller is electrically connected with the temperature sensor 14, the temperature sensor 14 detects the temperature of the slurry heated by the jacket heat exchange pipe 13, the heat exchange value of the jacket heat exchanger is controlled in real time according to the data fed back by the temperature sensor 14, so as to realize the temperature control of the slurry and maintain the stability of the slurry.

[0036] It needs to be further explained that the return pipe 2 is connected with the branch of the main pipe of the material conveying pipe 1 and the die head 101 through a three-way pipe 22, the branch is a transparent iron fluorine pipe 21, and the air in the die head 101 can be discharged into the return pipe 2 through the transparent iron fluorine pipe 21, so that the air in the die head 101 is quickly exhausted, the preparation time of the coating machine is reduced, and the production efficiency is improved.

[0037] In order to facilitate the control of the flow of the slurry, in the embodiment, referring to Figure 1 , the first pneumatic three-way ball valve 41 is arranged on the material conveying pipe 1 near the die head 101, the material conveying pipe 1 is connected with the return pipe 2 through the first pneumatic three-way ball valve 41, the second pneumatic three-way ball valve 42 is arranged on the recovery pipe 3 near the die head 101, and the recovery pipe 3 is connected with the flange ball valve 43 through the second pneumatic three-way ball valve 42.

[0038] It can be understood that, thus arranged, the material conveying pipe 1 is connected with the return pipe 2 through the first pneumatic three-way ball valve 41, the first pneumatic three-way ball valve 41 is arranged near the die head 101, before coating, the slurry between the slurry barrel 102 and the die head 101 needs to be circulated, and the stable flow of the slurry needs to be ensured. The first pneumatic three-way ball valve 41 is communicated with the return pipe 2, the slurry in the slurry barrel 102 is pumped into the material conveying pipe 1 through the screw pump 15, enters the return pipe 2 through the first pneumatic three-way ball valve 41, and returns to the slurry barrel 102, so that the air in the material conveying pipe 1 and the return pipe 2 is quickly exhausted, and the stable flow rate and pressure of the slurry in the material conveying pipe 1 and the return pipe 2 are formed, and then the coating work is carried out; the flange ball valve 43 connected with the second pneumatic three-way ball valve 42 is communicated with the external air, and the air in the recovery pipe 3 can be exhausted through the second pneumatic three-way ball valve 42 and the flange ball valve 43, and the pressure in the recovery pipe 3 is stabilized.

[0039] In order to control the conveying of the slurry in the pipe, in the embodiment, referring to Figure 1 and Figure 7The feed pipeline 1, the return pipeline 2 and the recovery pipeline 3 are each provided with a pressure transmitter 5.

[0040] It can be understood that in this way, the pressure transmitter 5 can monitor the air pressure in the pipeline in real time, feed back the air pressure to the control system of the coating machine, and judge the parameters of the screw pump 15, the diaphragm pump 31, the first pneumatic three-way ball valve 41 and the second pneumatic three-way ball valve 42, so as to facilitate the control of the transportation of the slurry.

[0041] In order to extract the slurry in the hopper 103 into the recovery pipeline 3, in the embodiment, the diaphragm pump 31 is provided on the recovery pipeline 3. Figures 1 to 4 Figure 6 The diaphragm pump 31 extracts the slurry in the hopper 103 into the recovery pipeline 3, and the Y-type filter 32 filters the slurry in the recovery pipeline 3.

[0042] It can be understood that in this way, the diaphragm pump 31 extracts the slurry in the hopper 103 into the recovery pipeline 3, and the slurry is pumped to the Y-type filter 32. When the slurry passes through the Y-type filter 32, the filtering elements inside the Y-type filter 32 will intercept and adsorb impurities, suspended solids and particulate matters in the liquid. The filtered slurry flows into the slurry barrel 102. The filtering elements are high-precision stainless steel filter screens or filter bags, which have high filtering efficiency and long service life.

[0043] In order to better extract the slurry in the hopper 103, in the embodiment, the diaphragm pump 31 is a pneumatic diaphragm pump 31. Figure 6

[0044] It can be understood that in this way, the diaphragm pump 31 uses compressed air as a power source to drive the piston to move up and down, so that the diaphragm inside also moves up and down, and the volume of the working chamber in the pump changes. Then, through the one-way valve of the working chamber, the strong suction and strong discharge of the slurry are realized. The pneumatic diaphragm pump 31, the first pneumatic three-way ball valve 41 and the second pneumatic three-way ball valve 42 are all powered by compressed air, which is convenient for control.

[0045] In order to drive the slurry to circulate in the pipeline, in the embodiment, the screw pump 15 is provided on the feed pipeline 1. Figures 1 to 4

[0046] It can be understood that in this way, the slurry outlet of the slurry barrel 102 leads to the screw pump 15. The screw pump 15 is driven by a motor. The screw pump 15 drives the slurry to circulate and flow in the feed pipeline 1 and the return pipeline 2. The flow rate and pressure of the slurry in the pipeline are controlled by adjusting the rotating speed and flow of the screw pump 15.

[0047] ​​​For the convenience of assembly and maintenance, in the embodiment, referring to Figures 1 to 4 , the coating machine slurry recycling system further comprises a mounting platform 6, the slurry barrel 102 is fixed on the mounting platform 6 through a first mounting frame 61, the screw pump 15 is arranged along the length direction of the mounting platform 6, the first filter 11 is fixed on the mounting platform 6 through a second mounting frame 62, the second filter 12 is fixed on the mounting platform 6 through a third mounting frame 63, and the diaphragm pump 31 is fixed on the mounting platform 6 through a fourth mounting frame 64.

[0048] It can be understood that, in this way, the slurry barrel 102, the screw pump 15, the diaphragm pump 31, the first filter 11 and the second filter 12 are arranged on the mounting platform 6, and the positions of the slurry barrel 102, the screw pump 15, the diaphragm pump 31, the first filter 11 and the second filter 12 are fixed, the mounting platform 6 is connected with the die head 101 through the material conveying pipeline 1, the backflow pipeline 2 and the recycling pipeline 3, and the installation and maintenance of the pipelines are facilitated.

[0049] It should be further explained that the mounting platform 6 is provided with casters 66 at the lower end, the mounting platform 6 can be moved through the casters 66, the slurry barrel 102 can be transferred according to the production needs, and the mounting platform 6 is provided with a lifting mechanism for lifting the barrel cover on one side of the slurry barrel 102, the lifting mechanism is used to control the lifting of the barrel cover, and the slurry barrel 102 is facilitated to add slurry and clean the barrel.

[0050] In order to facilitate the installation of the pipelines, in the embodiment, referring to Figures 1 to 3 , the mounting platform 6 is provided with a bracket 65 on the outer side, and the portions of the material conveying pipeline 1, the backflow pipeline 2 and the recycling pipeline 3 on the outer side of the mounting platform 6 are supported by the bracket 65.

[0051] It can be understood that, in this way, the mounting platform 6 is connected with the die head 101 through the material conveying pipeline 1, the backflow pipeline 2 and the recycling pipeline 3, the pipelines have a certain length, the pipeline connection positions are fixed by the quick mounting clamps 44, the pipelines are connected in a quick dismounting manner, the problem of pipeline blockage can be quickly solved to a certain extent, after the pipelines input the slurry, the quick mounting clamps 44 are easily pressed out of the gap, which causes the slurry to leak, and the bracket 65 is used to support the pipelines, so that the connection state of the pipelines is maintained, and the slurry leakage is avoided.

[0052] In order to better filter the slurry, in the embodiment, referring to Figures 1 to 3 , the first filter 11 is a scraper filter, and the second filter 12 is a capsule filter.

[0053] It can be understood that, thusly arranged, the scraper filter is gradually accumulated with impurities on the surface of the filter screen inside with the elapse of the filtering time, resulting in the increase of the pressure difference, the scraper is moved on the surface of the filter screen and physically scrapes off the dirt attached on the filter screen, the scraper and the filter screen form an included angle, and the shear force is generated after the rotation of the included angle, the impurities of the filter screen are cut and removed, and are discharged out of the scraper filter with the blowdown valve; when the slurry passes through the bag filter, the particle impurities above the specific size in the slurry are captured and left in the filter bag, and the clean slurry flows out to the feed pipe 1 through the filter bag.

[0054] The embodiment of the application realizes the circulation of the slurry through the feed pipe 1 and the return pipe 2, can stably control the flow rate and pressure of the slurry input to the die head 101, filters the slurry in the feed pipe 1 through the scraper filter and the bag filter, so as to filter out the impurities of the slurry to be delivered to the die head 101, performs heat exchange on the slurry in the feed pipe 1 through the jacket heat exchange pipe 13, so as to ensure the temperature stability of the coating slurry, and realizes the recycling of the slurry through the recovery pipe 3, the strong suction and discharge function of the diaphragm pump 31, and the filtering of the impurities before the recycled slurry through the Y-type filter 32.

[0055] The above is not any limitation on the technical range of the application, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the application still belong to the range of the technical scheme of the application.

Claims

1. A coater stock recovery circulation system characterized by, The application relates to a slurry feeding device, which comprises a die head and a slurry tank, wherein a feeding pipeline, a backflow pipeline and a recovery pipeline are arranged between the die head and the slurry tank, slurry in the slurry tank is conveyed to the die head through the feeding pipeline, the slurry at the die head is backflowed to the slurry tank through the backflow pipeline to form slurry circulation, a funnel for receiving slurry is arranged below the lip of the die head, the slurry in the funnel is conveyed to the slurry tank through the recovery pipeline, a first filter, a second filter and a jacketed heat exchange pipe are sequentially arranged on the feeding pipeline, the first filter and the second filter filter the slurry in the feeding pipeline, and the jacketed heat exchange pipe is arranged on the outer circumferential direction of the feeding pipeline to heat the slurry in the feeding pipeline.

2. The coater pulp recovery circulation system according to claim 1, characterized in that, The feeding pipeline is provided with a temperature sensor between the jacketed heat exchange pipe and the die head.

3. The coater stock-removal recycling system according to claim 1, characterized in that, The feeding pipeline is provided with a first pneumatic three-way ball valve at a position close to the die head, the feeding pipeline is connected with the backflow pipeline through the first pneumatic three-way ball valve, the recovery pipeline is provided with a second pneumatic three-way ball valve at a position close to the die head, and the recovery pipeline is connected with a flange ball valve through the second pneumatic three-way ball valve.

4. The coater stock-removal recycling system according to claim 1, characterized in that, The feeding pipeline, the backflow pipeline and the recovery pipeline are all provided with pressure transmitters.

5. The coater stock-removal recycling system according to claim 1, characterized in that, The recovery pipeline is provided with a diaphragm pump and a Y-shaped filter, the diaphragm pump draws the slurry in the funnel into the recovery pipeline, and the Y-shaped filter filters the slurry in the recovery pipeline.

6. The coater stock-removal recycling system according to claim 5, characterized in that, The diaphragm pump is a pneumatic diaphragm pump.

7. The coater stock-removal recycling system according to claim 5, characterized in that, The feeding pipeline is provided with a screw pump, and the screw pump draws the slurry in the slurry tank into the feeding pipeline.

8. The coater stock-removal recycling system according to claim 7, characterized in that, The application further comprises a mounting platform, the slurry tank is fixed on the mounting platform through a first mounting frame, the screw pump is arranged along the length direction of the mounting platform, the first filter is fixed on the mounting platform through a second mounting frame, the second filter is fixed on the mounting platform through a third mounting frame, and the diaphragm pump is fixed on the mounting platform through a fourth mounting frame.

9. The coater stock-removal recycling system according to claim 8, characterized in that, A bracket is arranged on the outer side of the mounting platform, and the feeding pipeline, the backflow pipeline and the recovery pipeline are supported by the bracket at the part outside the mounting platform.

10. The coater stock reclaiming circulation system according to claim 1, characterized in that, The first filter is a scraper filter, and the second filter is a bag filter.

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