A double roller squeezing and washing device

Abstract

The present invention proposes a double-roller squeezing and washing device, which belongs to the technical field of washing equipment. The device comprises an inner roller and an outer roller sleeved outside the inner roller, and a head baffle and a tail baffle are tightly fitted on the inner walls at both ends of the outer roller respectively; the outer roller and the inner roller are eccentrically arranged, and a gap is provided between the inner wall of the outer roller and the outer wall of the inner roller; a plurality of guide baffles are sequentially arranged between the head baffle and the tail baffle, and are fitted with the inner wall of the outer roller and the outer wall of the inner roller, and each guide baffle divides the cavity between the outer roller and the inner roller into a plurality of washing chambers. The double-roller squeezing and washing device provided by the present invention can achieve the effects of washing and squeezing simultaneously in one device, simplify the production process, improve production efficiency, and have good product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of elutriation equipment, and in particular relates to a double-roller squeezing and elutriation device. Background Art

[0002] Some resin products will inevitably generate salt by-products due to their synthesis reactions, and the final synthesized resin products contain a large amount of salts. The interweaving of salts and resin polymers will reduce the quality of resin products. In order to improve the economic value of resin products, it is necessary to reduce the salt content of resin products. Since salts generally have good solubility, they are generally removed by solvent washing, and the solvent is generally water, methanol, etc. The general operation is to first dissolve the salt-containing resin in a solvent to obtain a salt-containing resin slurry, squeeze the slurry, and dissolve it in a solvent again to obtain a resin slurry. Repeat the squeezing and slurrying process. Generally, a resin product with a qualified salt content can be obtained after 4 to 5 times.

[0003] The difficulty of resin desalination lies in the squeezing out of salt-containing resin slurry. After the resin product is treated with a centrifugal dryer, a frame squeezer, etc., it is difficult to reduce the moisture content below 200%. Moreover, this type of squeezer can only remove free solvents, while the salts that are truly dissolved in the resin are in microscopic pores and are difficult to squeeze out. Since the resin product is relatively sensitive to metal ions, it is not allowed to use a strong squeezer such as a screw squeezer. When this type of squeezer is working, the metal parts will produce friction with the resin under strong pressure, and the friction will cause the metal parts to release metal ions and pollute the resin. Therefore, a double-roll extruder is generally used in the prior art. The double-roll extruder is generally two identical steel round rollers arranged parallel to each other, and the gap between the two round rollers is very small. When working, the two round rollers have the same rotation speed and opposite rotation directions. The resin slurry containing salts enters the gap, and the resin is squeezed into thin sheets and passes through the gap under the extrusion action. In the above process, the friction between the double-roll extruder and the resin is greatly reduced compared to the screw squeezer. However, when the twin-roll extruder is extruding, most of the salts and solvents will be squeezed out of the gap together and cannot pass through the gap, resulting in low efficiency. At the same time, the surface of the twin-roll extruder is smooth, and the salt-containing resin slurry falls between the twin rolls and is easy to get stuck. Moreover, when the resin material cannot move synchronously with the twin rolls, it will still produce strong friction, causing metal ion pollution. In order to meet the salt content requirements, multiple twin-roll extruders and washing processes need to be set up, the production process is cumbersome, and the equipment investment is large. Summary of the invention

[0004] The invention provides a double-roller squeezing and washing device, which can achieve the effects of washing and squeezing simultaneously in one device, simplify the production process, improve the production efficiency, and have good product quality.

[0005] In order to achieve the above-mentioned object, the present invention provides a double-roller squeezing and washing device, comprising an inner roller and an outer roller sleeved outside the inner roller, the outer roller and the inner roller are of equal length, and a head baffle and a tail baffle are tightly fitted on the inner walls at both ends of the outer roller respectively; the outer roller and the inner roller are eccentrically arranged, and a gap is provided between the inner wall of the outer roller and the outer wall of the inner roller;

[0006] A second guide baffle, a first guide baffle and a third guide baffle are sequentially arranged between the head baffle and the tail baffle, and are in contact with the inner wall of the outer roller and the outer wall of the inner roller. Each guide baffle divides the cavity between the outer roller and the inner roller into a plurality of washing chambers. A filtering hole is arranged on one side of the first guide baffle and the second guide baffle adjacent to the outer roller.

[0007] A feed port is arranged on the head baffle; a solvent feed pipe extends into the washing chamber formed by the third guide baffle and the first guide baffle; a product outlet is arranged on the washing chamber formed by the tail baffle and the third guide baffle; and a solvent discharge pipe extends into the washing chamber formed by the second guide baffle and the first guide baffle.

[0008] Preferably, the minimum gap between the inner wall of the outer roller and the outer wall of the inner roller is 0.05-1 mm.

[0009] Preferably, the second guide baffle is sickle-shaped, with the tip facing the gap between the inner roller and the outer roller, and the other end connected to the side wall of the head baffle; the first guide baffle and the third guide baffle are both composed of a sickle-shaped guide plate and an arc-shaped baffle, the arc-shaped baffle is perpendicular to the axis of the outer roller, and the sickle-shaped guide plate and the arc-shaped baffle are V-shaped; the tip of the third guide baffle faces the gap between the inner roller and the outer roller, and is connected to the side wall of the tail baffle.

[0010] Preferably, the filter holes are distributed from the highest point of the first guide baffle and the second guide baffle to half of the difference between the inner diameter of the outer roller and the outer diameter of the inner roller, and the aperture of the filter holes is 0.5-5 mm.

[0011] Preferably, 2 to 4 first flow guide baffles are provided.

[0012] Preferably, a filter screen is provided in the solvent discharge pipe, and the pore size of the filter screen is 0.2 to 8 mm.

[0013] Preferably, it also includes two identical driving gears, which are coaxially connected to the power machine; an outer roller gear and an inner roller gear are respectively provided at the heads of the outer roller and the inner roller, and the outer roller gear and the inner roller gear respectively rotate in cooperation with the two driving gears.

[0014] Preferably, it also includes a supporting wheel, and the outer roller rotates along the axis under the support of the supporting wheel and is fixed on the chassis through the outer roller support.

[0015] Preferably, an inner roller shaft passing through the head baffle is arranged inside the inner roller, the inner roller rotates around the inner roller shaft, and the inner roller shaft is fixedly connected to the chassis through the inner roller support.

[0016] Preferably, the first guide baffle, the second guide baffle, the third guide baffle, the head baffle and the tail baffle are fixedly connected by a connecting rod, and both ends of the connecting rod are fixedly connected to the chassis through baffle supports.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are:

[0018] The double-roll squeeze and wash device provided by the present invention adopts a sleeve-type double-roll squeeze form to squeeze the resin slurry, which reduces the difficulty of the resin slurry entering the gap between the double rollers and is not easy to get stuck. At the same time, it can also reduce the friction between the double rollers and the resin slurry, and improve product quality. At the same time, a guide baffle is set, and the two processes of extrusion and washing can be realized in a single set of equipment, and multiple guide baffles can be set to achieve the purpose of multiple extrusions and washing, simplifying the production process and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the double-roller squeezing and washing device of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the double-roller squeezing and washing device of the present invention;

[0021] Figure 3 This is a schematic diagram of the end baffle structure of the double-roller squeezing and washing device of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of a twin-roll extruder for extruding a resin solvent;

[0023] Figure 5 It is a schematic diagram of the structure of the double-roller squeezing and washing device for squeezing resin solvent according to the present invention;

[0024] Figure 6 is a schematic structural diagram of a second guide baffle;

[0025] Figure 7 is a schematic structural diagram of a first guide baffle;

[0026] Figure 8 is a schematic structural diagram of the third guide baffle;

[0027] Fig. 9 It is a cross-sectional top view of the double-roller squeezing and washing device of the present invention;

[0028] Among them, 1-outer roller, 2-inner roller, 3-head baffle, 4-tail baffle, 5-first guide baffle, 6-second guide baffle, 7-third guide baffle, 8-washing chamber, 9-filter hole, 10-feed port, 11-solvent feed pipe, 12-product outlet, 13-solvent discharge pipe, 14-driving gear, 15-power machine, 16-outer roller gear, 17-inner roller gear, 18-support wheel, 19-outer roller support, 20-chassis, 21-inner roller shaft, 22-inner roller support, 23-connecting rod, 24-partition support, 25-sickle-shaped guide plate, 26-arc baffle. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 3 As shown, the present invention provides a double-roller squeezing and washing device, comprising an inner roller 2 and an outer roller 1 sleeved outside the inner roller, the outer roller 1 and the inner roller 2 are of equal length, and a head baffle 3 and a tail baffle 4 are tightly fitted on the inner walls at both ends of the outer roller 1 respectively; the outer roller 1 and the inner roller 2 are eccentrically arranged, and a gap is provided between the inner wall of the outer roller and the outer wall of the inner roller;

[0031] A second guide baffle 6, a first guide baffle 5 and a third guide baffle 7 are sequentially arranged between the head baffle and the tail baffle, and are in contact with the inner wall of the outer roller and the outer wall of the inner roller. Each guide baffle divides the cavity between the outer roller 1 and the inner roller 2 into a plurality of washing chambers 8. A filtering hole 9 is arranged on one side of the first guide baffle 5 and the second guide baffle 6 adjacent to the outer roller 1.

[0032] A feed port 10 is provided on the head baffle 3; a solvent feed pipe 11 extends to the elutriation chamber 8 formed by the third guide baffle 7 and the first guide baffle 5; a product outlet 12 is provided on the elutriation chamber 8 formed by the tail baffle 4 and the third guide baffle 7; and a solvent discharge pipe 13 extends to the elutriation chamber 8 formed by the second guide baffle 6 and the first guide baffle 5.

[0033] The double-roller squeezing and washing device provided by the present invention rotates the inner roller 2 and the outer roller 1 simultaneously during operation, and the inner roller 2 and the outer roller 1 rotate downward at the gap, and the linear velocity of the outer wall of the inner roller 2 is equal to the linear velocity of the inner wall of the outer roller 1. The solvent reaches the washing chamber formed by the third guide baffle 7 and the first guide baffle 5 through the solvent feed pipe 11. After the solvent fills the washing chamber, it passes through the upper filtering area of ​​the first guide baffle 5 to reach the adjacent washing chamber 8, and so on and so forth to finally reach each other washing chamber, and finally flows out from the solvent outlet; the salt-containing resin product is first mixed with an appropriate amount of solvent and enters the washing chamber formed by the second guide baffle 6 and the head baffle 3 through the feed port 10 and is mixed with the solvent in the washing chamber, and the solvent dissolves the salt and moves to the gap between the inner roller 2 and the outer roller 1 At the same time, the resin is squeezed into thin sheets and passes through the gap, and the solvent that has dissolved the salts is squeezed back into the elutriation chamber. The salt-containing solvent in the elutriation chamber will eventually pass through the upper filtration area of ​​the second guide baffle 6 and enter the elutriation chamber 8 formed by the second guide baffle 6 and the first guide baffle 5, and be discharged from the solvent discharge pipe 13; the resin flakes that pass through the gap between the inner roller 2 and the outer roller 1 corresponding to the elutriation chamber formed by the second guide baffle 6 and the head baffle 3 enter the adjacent elutriation chamber, where they are mixed and elutriated with the solvent again to further dissolve the carried salts, and finally enter the gap between the inner roller 2 and the outer roller 1 corresponding to the elutriation chamber to be squeezed again to remove the solvent, and so on. Finally, the resin with low salt content and low moisture content reaches the elutriation chamber formed by the tail baffle and the third guide baffle and is discharged from the product outlet.

[0034] The difficulty of removing salt from resin lies in squeezing out the salt-containing resin slurry. At present, a double-roll extruder is used in production. The double-roll extruder is generally two identical steel rollers set parallel to each other. The gap between the two rollers is very small. When working, the two rollers rotate at the same speed and in opposite directions. The resin slurry containing salts enters the gap. Figure 4 As shown, under the extrusion action, the resin is squeezed into thin sheets and passes through the gap, and most of the salts and solvents are squeezed out of the gap together and cannot pass through the gap. In addition, the surface of the double rollers of the double roller extruder is smooth, and the salt-containing resin slurry falling between the double rollers is easy to get stuck, often blocking the double roller squeezer. Even if it is not seriously blocked, if the resin material cannot move synchronously with the double rollers during operation, strong friction between the double rollers and the resin material will still be generated, which is easy to cause metal ion pollution. Therefore, during continuous production, multiple double roller extruders and washing processes need to be set according to the washing times required, and the production process is cumbersome and the equipment investment is large.

[0035] In the present application, a sleeve-type double-roll extrusion method is used to extrude a resin slurry containing salts such as Figure 5The sleeve-type double-roll extrusion form reduces the difficulty of the resin slurry entering the gap between the double rollers, and is not easy to get stuck. At the same time, it can also reduce the friction between the double rollers and the resin slurry, improve product quality, and set up a guide baffle at the same time. The two processes of extrusion and washing can be realized in a single set of equipment, and multiple guide baffles can be set to achieve the purpose of multiple extrusion and washing, simplifying the production process and improving production efficiency.

[0036] In the present invention, the minimum gap between the inner wall of the outer roller and the outer wall of the inner roller is preferably 0.05 to 1 mm. In the present invention, the lowest gap is set within this range to ensure that the resin slurry can be squeezed dry and the resin can pass through the gap. It is understood that if the gap is too small, the squeezed resin is not easy to discharge, and if the gap is too large, it is not easy to squeeze dry.

[0037] like Figures 6 to 8 As shown, in the present invention, preferably, the second guide baffle 6 is sickle-shaped, with the tip facing the gap between the inner roller 2 and the outer roller 1, and the other end connected to the side wall of the head baffle 3; the first guide baffle 5 and the third guide baffle 7 are both composed of a sickle-shaped guide plate 25 and an arc-shaped baffle 26, the arc-shaped baffle 26 is perpendicular to the axis of the outer roller, and the sickle-shaped guide plate 25 and the arc-shaped baffle 26 are V-shaped; the tip of the third guide baffle 7 faces the gap between the inner roller 2 and the outer roller 1, and is connected to the side wall of the tail baffle 4. It can be understood that in the present invention, the difference between the first guide baffle 5 and the third guide baffle 7 is that there is no filter hole 9 on the third guide baffle 7; the shape and size of the second guide baffle are exactly the same as the sickle-shaped guide plate 25 of the first guide baffle. The top view of the guide baffle in the double-roller squeezing and washing device is shown in FIG. Fig. 9 As shown. In the present invention, through such a setting, as the inner and outer rollers rotate, the material is squeezed by the inner and outer rollers, and the material after squeezing can enter the next elutriation chamber, that is, the material can enter the second elutriation chamber from the first elutriation chamber after being squeezed by the inner and outer rollers once, and finally enter the last elutriation chamber by analogy. At the same time, due to the existence of the filter holes on the guide baffle, the elutriation water can pass through the filter holes, that is, the liquid level can be kept horizontal under the action of gravity. The elutriation water enters the equipment from the tail end solvent inlet pipe, passes through the filter holes of the guide baffle, and finally flows out of the equipment from the solvent outlet. During the process, the elutriation water is generally opposite to the direction of material travel, which is conducive to the cleanest elutriation with the least water. The water storage capacity of each elutriation chamber is large. When the water intake of the equipment is small, the water stored in each elutriation chamber in the equipment can fully contact the material, thereby improving the water washing effect. In the present invention, the distance between the tip ends of each adjacent guide baffle is preferably equal. Through such a setting, the space between each elutriation chamber can be made more uniform, which is conducive to elutriation and squeezing.

[0038] In the present invention, the filter holes 9 are preferably distributed from the highest point of the first guide baffle 5 and the second guide baffle 6 to the position where the inner diameter of the outer roller 1 and the outer diameter of the inner roller 2 are half of each other, and the aperture of the filter holes 9 is preferably 0.5-5 mm. In the present invention, through such a setting, the solvent can pass through the filter holes, so that the equipment can operate normally, and the material in each elutriation chamber comes from the bottom, and the solvent enters from the next elutriation chamber through the filter holes, so that the contact time between the solvent and the material in different elutriation chambers can be increased, and the concentration of the solvent in each elutriation chamber is different. The concentration of the fresh solvent entering the tail end solvent inlet pipe is the lowest. As the concentration continues to increase through the elutriation chamber, the solvents in different elutriation chambers are prevented from mixing, which is conducive to improving the driving force of elutriation and using the least elutriation solvent to elute the material most cleanly. The clean solvent contacts the material to be discharged to ensure the elutriation effect, and the dirtiest solvent contacts the initial material to make full use of the elutriation solvent. The aperture requirement allows the solvent to pass through while preventing the material from passing through.

[0039] In the present invention, preferably 2 to 4 first flow guide baffles 5 are provided. By providing a plurality of first flow guide baffles 5, more washing chambers can be formed, so that the salts in the material can be washed more thoroughly and the product purity can be higher.

[0040] In the present invention, a filter screen is preferably provided in the solvent discharge pipe, and the pore size of the filter screen is 0.2 to 8 mm. In the present invention, a filter screen is provided in the solvent discharge pipe to intercept a small amount of resin mixed in the solvent, thereby improving the yield.

[0041] In the present invention, it is preferred that two identical driving gears 14 are also included, and the two driving gears 14 are coaxially connected to the power machine 15; an outer roller gear 16 and an inner roller gear 17 are respectively arranged at the heads of the outer roller 1 and the inner roller 2, and the outer roller gear 16 and the inner roller gear 17 respectively rotate in cooperation with the two driving gears 14. In the present invention, such an arrangement can ensure that when the outer roller 1 and the inner roller 2 rotate, the linear speeds of the outer wall of the inner roller 2 and the inner wall of the outer roller 1 are equal.

[0042] In the present invention, it is preferred to further include a support wheel 18, and the outer roller 1 rotates along the axis under the support of the support wheel 18, and is fixed to the chassis 20 through the outer roller support 19. In the present invention, by providing the support wheel 18, on the one hand, the outer roller 1 can be connected to the chassis 20, thereby achieving the effect of supporting the outer roller, which can make the outer roller more stable when rotating, and on the other hand, it is more conducive to the rotation of the outer roller.

[0043] In the present invention, the inner roller 2 is preferably provided with an inner roller shaft 21 passing through the head baffle 3, the inner roller 2 rotates around the inner roller shaft 21, and the inner roller shaft 21 is fixedly connected to the chassis 20 through the inner roller support 22. In the present invention, the inner roller shaft 21 is provided to connect the inner roller 2 to the chassis 20, so as to achieve the effect of supporting the inner roller, and make the inner roller more stable when rotating. It should be noted that: in the present invention, the inner roller shaft 21 and the inner roller are sealed to prevent the liquid from flowing in.

[0044] In the present invention, the first guide baffle 5 , the second guide baffle 6 , the third guide baffle 7 , the head baffle 3 and the tail baffle 4 are preferably fixedly connected by a connecting rod 23 , and both ends of the connecting rod 23 are fixedly connected to the chassis 20 through baffle supports 24 .

[0045] The double-roller squeezing and washing device provided by the invention is used in resin desalination and purification.

[0046] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0047] Example 1

[0048] In the double-roller squeezing and washing device used in this embodiment, the inner diameter of the outer roller is 2m, the outer diameter of the inner roller is 1.5m, the roller length is 2m, the minimum gap between the inner wall of the outer roller and the outer wall of the inner roller is 0.4mm, and the second guide baffle, two first guide baffles and the third guide baffle are arranged in sequence in the cavity formed by the head baffle, the tail baffle, the inner wall of the outer roller and the outer wall of the inner roller (the distance between the second vertical edge of the guide plate and the first fold line of the guide plate = the distance between the first fold line of the guide plate = the distance between the first fold line of the guide plate and the third fold line of the guide plate = the distance between the third fold line of the guide plate and the tail baffle, as shown in FIG. Fig. 9 As shown, the tip of the second guide baffle faces the gap between the inner roller and the outer roller, and the other end is connected to the side wall of the head baffle; the arc-shaped baffles of the first and third guide baffles are perpendicular to the axis of the outer roller; the tip of the third guide baffle faces the gap between the inner roller and the outer roller, and is connected to the side wall of the tail baffle), and a filter hole is set from the highest point of the first and second guide baffles to half of the difference between the inner diameter of the outer roller and the outer diameter of the inner roller (the upper edge of the filter area to the edge, the lower edge is a straight line, and the aperture of the filter hole is 1.5mm). A filter with an aperture of 0.5mm is set in the solvent discharge pipe.

[0049] Turn on the power machine and the driving gear starts to rotate. Driven by the driving gear, the outer roller gear and the inner roller gear rotate in coordination, thereby driving the inner roller and the outer roller to rotate. The reacted salt-containing resin (the salt-containing resin is o-cresol-formaldehyde resin with a salt content of 10%) is input from the feed port on the head baffle, and the solvent (water) is input through the solvent feed pipe in the washing chamber formed by the third guide baffle and the first guide baffle. The salt-containing resin is cleaned and extruded as the inner and outer rollers rotate (the linear speed of the inner and outer rollers is 0.5 m / s). The cleaned and extruded resin is discharged from the product outlet on the washing chamber formed by the tail baffle and the third guide baffle, and the cleaned salt-containing solvent is discharged from the solvent discharge pipe on the washing chamber formed by the second guide baffle and the first guide baffle.

[0050] 100 L of salt-containing resin was washed and squeezed dry for 1.5 min, and the amount of solvent (water) used was 50 L. The obtained product was tested, and its water content was 150 wt%, salt content was 0.01 wt%, and metal content was 0.0000001 wt%.

[0051] Example 2

[0052] In the double-roller squeezing and washing device used in this embodiment, the inner diameter of the outer roller is 2m, the outer diameter of the inner roller is 1.5m, the roller length is 2m, and the minimum gap between the inner wall of the outer roller and the outer wall of the inner roller is preferably 0.8mm. The second guide baffle, two first guide baffles and the third guide baffle are arranged in sequence in the cavity formed by the head baffle, the tail baffle, the inner wall of the outer roller and the outer wall of the inner roller (the distance between the second vertical edge of the guide plate and the first fold line of the guide plate = the distance between the first fold line of the guide plate = the distance between the first fold line of the guide plate and the third fold line of the guide plate = the distance between the third fold line of the guide plate and the tail baffle). The distance between the end baffles, the tip of the second guide baffle faces the gap between the inner roller and the outer roller, and the other end is connected to the side wall of the head baffle; the arc baffles of the first and third guide baffles are perpendicular to the axis of the outer roller; the tip of the third guide baffle faces the gap between the inner roller and the outer roller, and is connected to the side wall of the tail baffle), and a filter hole is set from the highest point of the first and second guide baffles to half of the difference between the inner diameter of the outer roller and the outer diameter of the inner roller (the upper edge of the filter area to the edge, the lower edge is a straight line, and the aperture of the filter hole is 3mm). A filter with an aperture of 0.2mm is set in the solvent discharge pipe.

[0053] Turn on the power machine and the driving gear starts to rotate. Driven by the driving gear, the outer roller gear and the inner roller gear rotate in coordination, thereby driving the inner roller and the outer roller to rotate. The reacted salt-containing resin (the salt-containing resin is polyphenylene sulfide with a salt content of 30%) is input from the feed port on the head baffle, and the solvent (water) is input through the solvent feed pipe in the washing chamber formed by the third guide baffle and the first guide baffle. The salt-containing resin is cleaned and extruded as the inner and outer rollers rotate (the linear speed of the inner and outer rollers is 0.5 m / s). The cleaned and extruded resin is discharged from the product outlet on the washing chamber formed by the tail baffle and the third guide baffle, and the cleaned salt-containing solvent is discharged from the solvent discharge pipe on the washing chamber formed by the second guide baffle and the first guide baffle.

[0054] 100 L of salt-containing resin was washed and squeezed dry for 0.8 min, and the amount of solvent (water) used was 50 L. The obtained product was tested, and its water content was 180 wt%, salt content was 0.01 wt%, and metal content was 0.0000001 wt%.

[0055] Comparative Example 1

[0056] The salt-containing resin to be cleaned is produced from the same batch as that in Example 1 and is exactly the same.

[0057] The salt-containing resin slurry was extruded by a double-roll extruder, the extrusion spacing between the two extrusion rollers was 0.8 mm, the roller length was 2 m, the linear speed of the extrusion rollers was 0.5 m / s, and the solvent (water) was sprayed on the extruded resin by a spray device during extrusion to remove the salts in the resin. This process was repeated 5 times to complete the washing and squeezing.

[0058] 100 L of salt-containing resin was washed and squeezed dry, which took 2 min and the amount of solvent (water) used was 60 L. The obtained product was tested and its water content was 190 wt%, salt content was 0.5 wt%, and metal content was 0.0000015 wt%.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-roller squeezing and washing device, characterized in that: It comprises an inner roller and an outer roller sleeved outside the inner roller, the outer roller and the inner roller are of equal length, and a head baffle and a tail baffle are tightly fitted on the inner walls at both ends of the outer roller respectively; the outer roller and the inner roller are eccentrically arranged, and a gap is provided between the inner wall of the outer roller and the outer wall of the inner roller; A second guide baffle, a first guide baffle and a third guide baffle are sequentially arranged between the head baffle and the tail baffle, and are in contact with the inner wall of the outer roller and the outer wall of the inner roller. Each guide baffle divides the cavity between the outer roller and the inner roller into a plurality of washing chambers. A filtering hole is arranged on one side of the first guide baffle and the second guide baffle adjacent to the outer roller. A feed port is provided on the head baffle; a solvent feed pipe extends to the elutriation chamber formed by the third guide baffle and the first guide baffle; a product outlet is provided on the elutriation chamber formed by the tail baffle and the third guide baffle; a solvent discharge pipe extends to the elutriation chamber formed by the second guide baffle and the first guide baffle; It also includes two identical driving gears, which are coaxially connected to the power machine; an outer roller gear and an inner roller gear are respectively arranged at the heads of the outer roller and the inner roller, and the outer roller gear and the inner roller gear respectively rotate in cooperation with the two driving gears; The first guide baffle, the second guide baffle, the third guide baffle, the head baffle and the tail baffle are fixedly connected by a connecting rod, and both ends of the connecting rod are fixedly connected to the chassis through a baffle support.

2. The elutriation device according to claim 1, characterized in that: The minimum gap between the inner wall of the outer roller and the outer wall of the inner roller is 0.05 to 1 mm.

3. The washing device according to claim 1, characterized in that: The second guide baffle is sickle-shaped, with the tip facing the gap between the inner roller and the outer roller, and the other end connected to the side wall of the head baffle; the first guide baffle and the third guide baffle are both composed of a sickle-shaped guide plate and an arc-shaped baffle, the arc-shaped baffle is perpendicular to the axis of the outer roller, and the sickle-shaped guide plate and the arc-shaped baffle are V-shaped; the tip of the third guide baffle faces the gap between the inner roller and the outer roller, and is connected to the side wall of the tail baffle.

4. The elutriation device according to claim 1, characterized in that: The filter holes are distributed from the highest point of the first guide baffle and the second guide baffle to half of the difference between the inner diameter of the outer roller and the outer diameter of the inner roller, and the aperture of the filter holes is 0.5-5mm.

5. The elutriation device according to claim 1, characterized in that: 2 to 4 first flow guide baffles are provided.

6. The elutriation device according to claim 1, characterized in that: A filter screen is arranged in the solvent discharge pipe, and the pore size of the filter screen is 0.2-8 mm.

7. The elutriation device according to claim 1, characterized in that: It also includes a supporting wheel. The outer roller rotates along the axis under the support of the supporting wheel and is fixed on the chassis through the outer roller support.

8. The elutriation device according to claim 1, characterized in that: An inner roller shaft passing through the head baffle is arranged inside the inner roller, the inner roller rotates around the inner roller shaft, and the inner roller shaft is fixedly connected to the chassis through the inner roller support.

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