Device for reducing volatilization of extracting agent in extraction tank

Abstract

The invention discloses a device for reducing volatilization of an extraction agent in an extraction tank, which comprises a drying furnace (1), a drying furnace baffle (2) for separating the drying furnace (1) and a drying extraction roller, an outlet water seal (3) is injected at the lower part of an inner cavity of the drying furnace (1), and the lower part of the drying furnace baffle (2) is immersed in the outlet water seal (3); the inner cavity of the drying furnace (1) above the outlet water seal (3) is divided into two mutually isolated independent spaces by the drying furnace baffle (2), a water seal extraction roller (4) is arranged in the outlet water seal (3), and the water seal extraction roller (4) is used for being connected with diaphragms (5) on a lead-in extraction roller and a drying extraction roller which are respectively positioned in the two mutually isolated independent spaces. The outlet water seal can effectively reduce the unorganized discharge amount of the extracting agent, so that the production cost is reduced, and the production environment is improved; the water scraping roller and the air knife can solve the problem that water on the surface of the diaphragm is removed after the diaphragm penetrates through the water seal, and the product quality of the diaphragm is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wet-process lithium battery diaphragm extraction process, in particular to a device for reducing the volatilization of an extractant in an extraction tank. Background Art

[0002] Extraction and drying is an important process in the production of wet-process lithium battery diaphragms. Due to the continuous characteristics of diaphragm production in each process, there are many gaps in the diaphragm production line for the diaphragm to pass through. Therefore, the low-boiling volatile organic extractant used to extract the pore-forming agent in the diaphragm will diffuse into the environment in an unorganized manner through the gaps at the inlet and outlet of the extraction tank, which greatly increases the consumption of raw material extractants and increases production costs. On the other hand, the harm of the extractant volatilized into the workshop environment to the production environment and the health of operators cannot be ignored.

[0003] At present, the drying furnace of the original production equipment is separated by a baffle in the middle, and the bottom of the baffle is connected. The diaphragm passes through the position without a baffle below, which will cause a large amount of volatilization of the extractant. Summary of the invention

[0004] The purpose of the present invention is to provide a device for reducing the volatilization of the extractant in the extraction tank in view of the problems existing in the prior art.

[0005] The purpose of the present invention is to be solved by the following technical solutions: A device for reducing the volatilization of an extractant in an extraction tank comprises a drying furnace, a drying furnace baffle separating the drying furnace, and a drying extraction roller and an air knife arranged in cooperation with each other, characterized in that: an outlet water seal is injected into the lower part of the inner cavity of the drying furnace and the lower part of the drying furnace baffle is immersed in the outlet water seal, the drying furnace baffle separates the inner cavity of the drying furnace above the outlet water seal into two independent spaces isolated from each other, a water seal extraction roller is arranged in the outlet water seal, and the water seal extraction roller is used to connect the diaphragms on the introduction extraction roller and the drying extraction roller respectively located in the two independent spaces isolated from each other.

[0006] The water seal extraction roller is located in the outlet water seal below the baffle of the drying furnace.

[0007] A wiper roller is arranged between the water seal extraction roller and the drying extraction roller. The wiper roller is located above the outlet water seal. The inlet extraction roller, the water seal extraction roller, the wiper roller and the drying extraction roller are arranged parallel to each other.

[0008] There is at least one wiper roller. When the number of wiper rollers exceeds one, the roller surfaces of adjacent wiper rollers are in contact with the front and back surfaces of the diaphragm respectively.

[0009] At least one set of mutually coordinated drying and extraction rollers and wind knives are arranged above the wiper roller. The drying and extraction rollers and wind knives are respectively located on both sides of the diaphragm and the diaphragm is attached to the drying and extraction rollers. The wind knives can control the temperature and air volume.

[0010] The roller surfaces of the adjacent drying and extraction rollers and the wiper rollers are in contact with the front and back surfaces of the diaphragm respectively.

[0011] The side of the drying and extraction roller is provided with a corresponding wind knife; and the drying and extraction roller and the wind knife are provided with at least one group, and the wind knife can realize the control of temperature and air volume, and the roller surfaces of adjacent drying and extraction rollers are respectively in contact with the front and back sides of the diaphragm.

[0012] The wiper roller is a mirror wiper roller with a smooth surface. The roller surface of the wiper roller is made of stainless steel with a chrome-plated surface. The surface hardness of the wiper roller is greater than HRC60. The wiper roller is provided with a ceramic bearing and is an active drive roller connected to a motor, thereby reducing the friction between the membrane surface and the roller surface. The interior of the wiper roller is passed through circulating heat-conducting oil, and the temperature of the wiper roller can be controlled by an oil temperature controller to enhance the drying effect of the diaphragm.

[0013] The wiper roller is arranged on a wiper roller bracket, and the wiper roller bracket is fixed inside the drying furnace.

[0014] The wiper roller bracket includes a bracket frame, a stainless steel screw, a screw bearing seat, a guide seat, a screw handwheel, a slide rail slider, and a locking device. At least one end of the bracket frame is provided with a bayonet, which is fixed inside the drying furnace by a detachable fixed connection method. Two screw bearing seats for accommodating the stainless steel screw are arranged on the bracket frame. The upper part of the guide seat is threadedly connected to the stainless steel screw, and the lower part of the guide seat is connected to the bottom of the groove of the bracket frame through the slide rail slider. One end of the stainless steel screw passes through the furnace wall of the drying furnace and is connected to the screw handwheel. The roller seat of the wiper roller is installed on the guide seat; the locking device can lock the stainless steel screw to limit the rotation of the stainless steel screw.

[0015] The screw hand wheel is used to adjust the position of the guide seat so as to achieve the adjustable position of the wiper roller on both sides of the diaphragm.

[0016] Furthermore, the screw handwheel is provided with a scale digital handwheel to control the adjustment accuracy of the screw handwheel.

[0017] When the wiper rollers are arranged in pairs, any one of the wiper rollers can move horizontally relative to the wiper roller bracket, thereby adjusting the distance between the two wiper rollers.

[0018] Compared with the prior art, the present invention has the following advantages: The device of the present invention isolates the unorganized volatilization of the extractant by adding an outlet water seal at the film outlet in the extraction and drying process. Since there will be moisture on the surface of the diaphragm after the outlet water seal is added, a large number of membrane surface defects will be caused to the diaphragm product. Therefore, a wiper roller structure that can be used for dewatering and an air knife are further designed in the narrow drying furnace space to dry the membrane surface. By controlling process parameters such as the temperature of the wiper roller and the power of the air knife, the unorganized emission of the extractant can be reduced while controlling the membrane surface defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a structural schematic diagram of a device for reducing the volatilization of an extractant in an extraction tank according to the present invention; Attached Figure 2 It is a schematic diagram of the structure of the wiper roller bracket of the present invention.

[0020] Among them: 1-drying furnace; 2-drying furnace baffle; 3-export water seal; 4-water seal extraction roller; 5-diaphragm; 6-drying extraction roller one; 7-drying extraction roller two; 8-wiping roller one; 9-wiping roller two; 10-air knife one; 11-air knife two; 121-support frame; 122-stainless steel screw rod; 123-screw rod bearing seat; 124-guide seat; 125-screw rod handwheel; 126-slide rail slider; 127-locking device; 128-scale digital handwheel; 129-bayonet; 13-introduction extraction roller. Implementation

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 The device for reducing the volatilization of the extractant in the extraction tank is shown in the figure. The device forms an outlet water seal 3 by injecting water into the drying furnace 1 of the current diaphragm production line, and the water level exceeds the lower edge of the baffle 2 of the drying furnace; a water seal extraction roller 4 is arranged in parallel with the introduction extraction roller and the drying extraction roller in the outlet water seal 3, and the diaphragm 5 passes through the water seal extraction roller 4 to pass through the outlet water seal 3 to achieve transmission continuity. After adding the outlet water seal 3, in order to further ensure the drying effect, a wiper roller 1 8 and a wiper roller 2 9 are added to the inner cavity of the box at the rear end of the drying furnace 1 isolated by the outlet water seal 3, which are located above the liquid level of the outlet water seal 3. The wiper roller 1 8 and the wiper roller 2 9 are respectively arranged on the corresponding wiper roller brackets, and the roller surfaces of the wiper roller 1 8 and the wiper roller 2 9 are respectively in contact with the front and back surfaces of the diaphragm 5, and the central axes of the wiper roller 1 8, the wiper roller 2 9, the water seal extraction roller 4, the drying extraction roller 1 6, and the drying extraction roller 2 7 are parallel to each other.

[0023] Commonly used extractants are one of benzene, carbon tetrachloride, ether, petroleum ether, and dichloromethane, and dichloromethane is preferred in this application.

[0024] Wiper roller bracket provided as Figure 2As shown, the wiper roller bracket includes a bracket frame 121, a stainless steel screw 122, a screw bearing seat 123, a guide seat 124, a screw handwheel 125, a slide rail slider 126, a locking device 127, and a buckle 129. A bayonet 129 capable of limiting the position of the bracket frame 121 is provided at at least one end of the bracket frame 121. The bayonet 129 is fixed inside the drying furnace 1 by a detachable fixed connection method. The bayonet 129 can be arranged at one end provided with the screw handwheel 125, and its opening is fixed downward on the beam inside the drying furnace 1, and is fixedly connected to the beam by a detachable fixed connection method, a fixed nut connection, a key connection, etc. Joint, pin connection or wedge connection are all detachable fixed connection methods. In this embodiment, a fixed nut threaded connection is preferred. The slide rail slider 126 is fixed on the bracket frame 121. A guide seat 124 that supports the wiper roller roller seat is fixed above the slide rail slider 126. A stainless steel screw rod 122 with a screw handwheel 125 at one end is installed on two screw bearing seats 123. The stainless steel screw rod 122 is connected to the guide seat 124 with a nut structure to form a screw structure. A wiper roller roller seat is installed on the guide seat 124. The screw handwheel 125 is used to adjust the position of the guide seat 124 to achieve adjustable position of the wiper roller relative to the diaphragm 5. Furthermore, the screw handwheel 125 is provided with a scale digital handwheel 128 to control the adjustment accuracy of the screw handwheel 125; the locking device 127 located outside the drying furnace 1 is installed on the stainless steel screw 122 to lock the stainless steel screw 122. This figure is only one embodiment, and the wiper roller bracket can also be suspended on the same beam at the same time. At this time, the length of the bracket frame 121 can be adjusted to cooperate with the wiper roller.

[0025] The bayonet 129 in this embodiment is arranged at one end where the screw hand wheel 125 is arranged; in other embodiments, the bayonet 129 can be arranged at both ends of the bracket frame 121 according to the actual layout of the beams in the drying furnace.

[0026] like Figure 1 As shown, the roller surface of wiper roller 1 8 contacts the front side of diaphragm 5, and the roller surface of wiper roller 2 9 contacts the back side of diaphragm 5, and the position of wiper roller 2 9 is higher than that of wiper roller 1 8; the roller seats of wiper roller 1 8 and wiper roller 2 9 are both fixed in the drying furnace 1 through wiper roller brackets, and the positions of wiper roller 1 8 and wiper roller 2 9 are both adjustable.

[0027] Furthermore, circulating heat transfer oil is passed through the interior of the wiper roller 1 8 and the wiper roller 2 9 , and the temperature of the wiper roller can be controlled by an oil temperature controller, thereby enhancing the drying effect of the diaphragm 5 .

[0028] Furthermore, the wiper roller 1 8 and the wiper roller 2 9 are mirror rollers with smooth surfaces. Furthermore, the roller surfaces of the wiper roller 1 8 and the wiper roller 2 9 are made of chrome-plated stainless steel, and the surface hardness of the roller surfaces is greater than HRC60.

[0029] Furthermore, ceramic bearings (installed on corresponding roller seats) are provided at both ends of wiper roller 1 8 and wiper roller 2 9. Further, wiper roller 1 8 and wiper roller 2 9 are actively driven rollers connected to a motor, thereby reducing the friction between the diaphragm 5 and the roller surface.

[0030] like Figure 1 As shown, a wind knife 10 is provided on the side of the drying and extraction roller 1 6, and a wind knife 2 11 is provided on the side of the drying and extraction roller 2 7. The wind knife 10 and the wind knife 2 11 are used to improve the drying efficiency of the membrane surface of the diaphragm 5; further, the wind knife 10 and the wind knife 2 11 can realize the control of temperature and air volume.

[0031] The present invention discloses a device for reducing the volatilization of an extractant in an extraction tank. An outlet water seal 3 is added to a film outlet in an extraction drying process to isolate the unorganized volatilization of the extractant. At the same time, a wiper roller structure for removing water is designed and two sets of wind knives are added to dry the film surface. In addition, a wiper roller bracket is designed to fix the wiper roller, so that the position of the wiper roller in a drying furnace 1 is adjustable. By controlling process parameters such as the temperature of the wiper roller and the power of the wind knife, the unorganized emission of the extractant is reduced while controlling the defects of the membrane surface of the diaphragm 5.

[0032] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A device for reducing the volatilization of an extractant in an extraction tank, comprising a drying furnace (1), a drying furnace baffle (2) separating the drying furnace (1), and a drying extraction roller, characterized in that: The lower part of the inner cavity of the drying furnace (1) is filled with an outlet water seal (3) and the lower part of the drying furnace baffle (2) is immersed in the outlet water seal (3). The drying furnace baffle (2) divides the inner cavity of the drying furnace (1) above the outlet water seal (3) into two mutually isolated independent spaces. A water seal extraction roller (4) is provided in the outlet water seal (3). The water seal extraction roller (4) is used to connect the introduction extraction roller (13) and the diaphragm (5) on the drying extraction roller respectively located in the two mutually isolated independent spaces.

2. The device for reducing the volatilization of the extractant in the extraction tank according to claim 1, characterized in that: The water seal extraction roller (4) is located in the outlet water seal (3) below the drying furnace baffle (2).

3. The device for reducing the volatilization of the extractant in the extraction tank according to claim 1, characterized in that: A scraper roller is provided between the water seal extraction roller (4) and the drying extraction roller. The scraper roller is located above the outlet water seal (3). The inlet extraction roller, the water seal extraction roller (4), the scraper roller, and the drying extraction roller are arranged parallel to each other.

4. The device for reducing the volatilization of the extractant in the extraction tank according to claim 3, characterized in that: At least one wiper roller is provided, and when the number of wiper rollers exceeds one, the roller surfaces of adjacent wiper rollers are in contact with the front and back surfaces of the diaphragm (5) respectively.

5. The device for reducing the volatilization of the extractant in the extraction tank according to claim 3 or 4, characterized in that: At least one set of mutually coordinated drying and extraction rollers and wind knives are provided above the wiper roller, the drying and extraction rollers and wind knives are respectively located on both sides of the diaphragm (5), and the diaphragm (5) is attached to the drying and extraction rollers.

6. The device for reducing the volatilization of the extractant in the extraction tank according to claim 6, characterized in that: The roller surfaces of the adjacent drying and extraction rollers and the wiper roller are in contact with the front and back surfaces of the diaphragm (5) respectively.

7. The device for reducing the volatilization of the extractant in the extraction tank according to any one of claims 1 to 3, characterized in that: Wind knives corresponding to the drying and extraction rollers are arranged on the sides of the drying and extraction rollers; and at least one set of the drying and extraction rollers and the wind knives is provided, and the roller surfaces of adjacent drying and extraction rollers are in contact with the front and back surfaces of the diaphragm (5) respectively.

8. The device for reducing the volatilization of the extractant in the extraction tank according to claim 3, characterized in that: The wiper roller is a mirror wiper roller with a smooth surface. The roller surface of the wiper roller is made of chrome-plated stainless steel. The surface hardness of the wiper roller is greater than HRC60. The wiper roller is an active drive roller connected to a motor. Circulating heat transfer oil is passed through the interior of the wiper roller.

9. The device for reducing the volatilization of the extractant in the extraction tank according to any one of claims 3 to 6 and 8, characterized in that: The wiper roller is arranged on a wiper roller bracket, and the wiper roller bracket is fixed inside the drying furnace (1).

10. The device for reducing the volatilization of the extractant in the extraction tank according to claim 9, characterized in that: The wiper roller bracket comprises a bracket frame (121), a stainless steel screw (122), a screw bearing seat (123), a guide seat (124), a screw hand wheel (125), a slide rail slider (126), and a locking device (127). At least one end of the bracket frame (121) is provided with a bayonet (129), and the bayonet (129) is fixed inside the drying furnace (1) by a detachable fixed connection. The bracket frame (121) is provided with a stainless steel screw (122). ), the upper part of the guide seat (124) is threadedly connected to the stainless steel screw rod (122), the lower part of the guide seat (124) is connected to the bottom of the groove of the bracket frame (121) through a slide rail slider (126), one end of the stainless steel screw rod (122) passes through the furnace wall of the drying furnace (1) and is connected to the screw rod hand wheel (125), and a roller seat of a wiper roller is installed on the guide seat (124); the locking device (127) can lock the stainless steel screw rod (122).

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