Wet forming device for increasing density of activated carbon filter element and production method

Abstract

The invention discloses a wet forming device for increasing the density of an activated carbon filter element and a production method. The wet forming device comprises a mounting main body, an adsorption channel and a negative pressure adsorption mechanism, the central pipe is provided with a plurality of drainage holes distributed in the length direction of the central pipe; the soft sleeve is arranged outside the central pipe in a sleeving manner; the lower end cover and / or the upper end cover can reciprocate along an internal channel of the soft sleeve, and a forming space is defined by the lower end cover, the upper end cover, the soft sleeve and the central pipe; an axial pressure mechanism and a radial pressure mechanism; the production method comprises the steps that the framework cylinder is arranged on the central pipe in a sleeving mode, water-containing filter element slurry is put into the forming space, water in the filter element slurry is extruded out in the axial direction and the radial direction under the combined action of the axial pressure mechanism and the radial pressure mechanism, and the extruded water is sucked away by the negative pressure adsorption mechanism through the drainage hole; dehydrated filter element slurry is stably attached to the framework cylinder, the density of the activated carbon filter element is increased, and the problem that the filter element slurry falls off due to a rolling forming mode is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a wet forming device and production method for increasing the density of activated carbon filter elements. BACKGROUND

[0002] Wet activated carbon forming is a technology for manufacturing composite activated carbon filter elements, and the main process steps of the technology are roughly as follows: activated carbon particles, fiber materials and other additives are mixed with a binder, and after being fully beaten in water, the mixture is stirred to form a mixed slurry, then the mixed slurry is sleeved on a skeleton cylinder, and the mixed slurry is attached to the skeleton cylinder to form a filter material layer by negative pressure adsorption, and then the production is completed through steps such as rolling forming, drying, cloth wrapping, etc.

[0003] Among them, the negative pressure adsorption and rolling forming process is mainly for dewatering and increasing the density of the carbon fiber rod. Rolling forming is to use a rolling shaft to roll the carbon fiber rod adsorbed into a cylindrical shape. If the diameter of the carbon fiber rod before rolling is too large, the rolling shaft is easy to push the material away, or make the material layered, so that it cannot be normally formed, which means that this process cannot make the carbon fiber filter element have very large density, that is, the filtering precision of the carbon fiber filter element made by this process cannot meet the higher precision requirement. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one of the purposes of the present application is to propose a wet forming device capable of extruding water along the axial and radial directions of the activated carbon filter element and stably attaching the filter slurry to the skeleton cylinder to increase the density of the activated carbon filter element; and the second purpose is to propose a wet forming device for increasing the density of the activated carbon filter element.

[0005] According to the wet forming device for increasing the density of the activated carbon filter element, the device comprises: a mounting body provided with an adsorption channel, wherein a negative pressure adsorption mechanism is communicated with the adsorption channel; a center pipe provided in the mounting body, wherein an internal passage of the center pipe is communicated with the adsorption channel, and a plurality of drainage holes are provided in the center pipe and distributed along the length direction of the center pipe; a soft sleeve provided outside the center pipe; a lower end cover and an upper end cover provided at both ends of the soft sleeve, respectively, wherein the lower end cover and / or the upper end cover can reciprocate along the internal passage of the soft sleeve, and the lower end cover, the upper end cover, the soft sleeve and the center pipe form a closed forming space for containing the filter element slurry containing water; an axial pressure mechanism connected with the lower end cover and / or the upper end cover, for driving the lower end cover and the upper end cover to move towards each other along the axial direction of the soft sleeve; and a radial pressure mechanism provided outside the soft sleeve, for applying pressure inwardly along the radial direction of the soft sleeve.

[0006] The wet forming device for increasing the density of activated carbon filter element has at least the following beneficial effects: In the process of manufacturing the activated carbon filter element, the skeleton cylinder is sleeved on the center tube, the filter element slurry containing water is poured into the forming space, the water in the filter element slurry is squeezed out in the axial and radial directions by the combined action of the axial pressure mechanism and the radial pressure mechanism, the squeezed water is sucked away by the negative pressure adsorption mechanism through the drain hole, so that the filter element slurry after dehydration is uniformly and stably attached to the skeleton cylinder, the problem that the filter element slurry is easily caused to fall off by the traditional rolling forming mode is avoided, and the density of the activated carbon filter element can be increased.

[0007] In some embodiments of the present application, the radial pressure mechanism comprises a hard sleeve sleeved on the outside of the soft sleeve, a closed cavity is formed between the inner circumferential wall of the hard sleeve and the outer circumferential wall of the soft sleeve, a plurality of through holes are formed through the outer circumferential wall of the hard sleeve and communicated with the closed cavity, and a hydraulic system is connected to the through holes to tightly clamp the filter element slurry in the forming space.

[0008] In some embodiments of the present application, the outer circumferences of the upper end and the lower end of the hard sleeve are respectively provided with a first mounting ring and a second mounting ring, the upper end of the soft sleeve is provided with a first annular flange tightly attached to the first mounting ring, and the lower end of the soft sleeve is provided with a second annular flange tightly attached to the second mounting ring.

[0009] In some embodiments of the present application, the first mounting ring is connected with a first fixing ring for clamping and fixing the first annular flange, the second mounting ring is connected with a second fixing ring for clamping and fixing the second annular flange, the upper end cover can abut against the first fixing ring and seal the upper end port of the soft sleeve, the upper end cover and / or the hard sleeve is connected with a first lifting driver, the lower end cover is movably arranged in the second mounting ring, the center tube is movably arranged in the lower end cover, the outer circumferential wall of the lower end cover is tightly attached to the inner circumferential wall of the soft sleeve, and the lower end cover is connected with a second lifting driver for driving the lower end cover to move up and down along the internal passage of the soft sleeve.

[0010] In some embodiments of the present application, a plurality of first through holes are formed in the first fixing ring along the circumferential direction, a plurality of second through holes are formed in the second fixing ring along the circumferential direction, the first mounting ring is provided with a first threaded column sleeve corresponding to the first through holes one by one, the second mounting ring is provided with a second threaded column sleeve corresponding to the second through holes one by one, a fastening screw is arranged in the first through hole and screwed in the first threaded column sleeve, and a fastening screw is arranged in the second through hole and screwed in the second threaded column sleeve.

[0011] In some embodiments of the present application, the upper end cover comprises a plug head fitted with the inner peripheral wall of the first fixing ring and a limiting plate connected to the upper end of the plug head and capable of abutting against the upper surface of the first fixing ring, the outer peripheral wall of the plug head is provided with a first sealing ring in elastic contact with the inner peripheral wall of the first fixing ring, and the middle part of the plug head is provided with a positioning insertion hole for inserting the upper end of the central pipe.

[0012] In some embodiments of the present application, the mounting body comprises a main pipe coaxially movably sleeved on the outside of the central pipe, the main pipe is provided through the second fixing ring, the lower end of the main pipe is connected with a flange seat, the internal passage of the main pipe constitutes the adsorption channel, the lower end face of the second fixing ring or the lower end face of the lower end cover is provided with a second sealing ring located at the outer periphery of the main pipe, and the second lifting driver is connected with the flange seat.

[0013] In some embodiments of the present application, the upper end of the adsorption channel is provided with a necking portion matched with the outer diameter size of the central pipe, a limiting step is formed between the necking portion and the adsorption channel, the lower end of the central pipe is provided with an annular guide portion slidably arranged in the adsorption channel and capable of abutting against the limiting step, a return spring is arranged in the adsorption channel and capable of abutting against the mounting body and the annular guide portion at both ends, and the return spring drives the mounting body to move downward relative to the central pipe.

[0014] In some embodiments of the present application, the first lifting driver comprises two lifting cylinders connected with the upper end cover and the hard sleeve respectively, one of the lifting cylinders drives the upper end cover to move away from the upper end of the central pipe, and the other lifting cylinder drives the hard sleeve to move downward relative to the central pipe to expose the middle upper part of the central pipe.

[0015] According to the production method of the second aspect of the present application, the wet forming device for increasing the density of the activated carbon filter element is applied, and the method comprises the following steps: The filter core slurry is prepared by crushing and grinding raw materials and mixing them in a solvent to form a filter core slurry containing water, which is used to form an activated carbon filter core; the skeleton cylinder is sleeved on the outside of the central pipe, the filter core slurry is put into the forming space of the wet forming device, the lower end cover and the upper end cover are driven to approach each other by the axial pressure mechanism, and the radial pressure mechanism is pressed radially inward toward the soft sleeve, so that the filter core slurry is extruded in the axial and radial directions of the forming space to extrude the water in the filter core slurry, and the extruded water is sucked away by the negative pressure suction mechanism through the drain hole of the central pipe, and then a filter core semi-finished product stably attached to the outside of the skeleton cylinder is obtained; the filter core semi-finished product is dried, and the non-woven fabric is coated on the outer surface of the dried filter core semi-finished product. The above production method makes the dehydrated filter core slurry uniformly and stably attached to the skeleton cylinder, avoids the problem that the traditional rolling forming method is prone to cause the filter core slurry to fall off, and can also increase the density of the activated carbon filter core.

[0016] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, which follows, when considered in connection with the following drawings, in which: Figure 1 The cross-sectional view of the upper end cover of an embodiment of the wet forming device for increasing the density of the activated carbon filter core when the upper end cover is away from the lower end cover; Figure 2 The cross-sectional view of the upper end cover of an embodiment of the wet forming device for increasing the density of the activated carbon filter core when the upper end cover is away from the lower end cover; Figure 1 The cross-sectional view of the upper end cover of an embodiment of the wet forming device for increasing the density of the activated carbon filter core when the upper end cover is away from the lower end cover; Figure 3 The cross-sectional view of the upper end cover of an embodiment of the wet forming device for increasing the density of the activated carbon filter core when the upper end cover is away from the lower end cover; Figure 1 The exploded view of the wet forming device of an embodiment for increasing the density of the activated carbon filter core.

[0018] Reference signs: Skeleton cylinder 10; filter core slurry 20; mounting body 100; suction channel 101; main pipe 110; flange seat 120; central pipe 200; drain hole 201; annular guide portion 210; soft sleeve 300; first annular flange 310; second annular flange 320; lower end cover 400; upper end cover 500; plug 510; limiting plate 520; first sealing ring 530; positioning insertion hole 540; forming space 600; hard sleeve 700; closed chamber 701; through hole 702; first mounting ring 710; second mounting ring 720; first fixing ring 810; second fixing ring 820; reset spring 900. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described below in the accompanying drawings, in which like reference numerals refer to like elements or elements having the same function throughout the several views. The following detailed description is exemplary in nature and is not intended to limit the scope, applicability, or configuration of the application.

[0020] In the description of the present application, it needs to be understood that, in relation to orientation description, for example, the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described that the first, second, etc. is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance of the indicated technical features or implying a number of the indicated technical features or implying an order of the indicated technical features.

[0022] In the description of the present application, it needs to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Reference is made to Figures 1 to 3The wet forming device for increasing the density of activated carbon filter element comprises an installation main body 100 provided with an adsorption channel 101 communicated with a negative pressure adsorption mechanism, a center pipe 200 arranged in the installation main body 100 and having an internal channel communicated with the adsorption channel 101, a plurality of drainage holes 201 penetrating through the center pipe 200 and distributed along the length direction of the center pipe 200, a soft sleeve 300 sleeved on the outside of the center pipe 200, a lower end cover 400 and an upper end cover 500 arranged at the two ends of the soft sleeve 300 respectively, the lower end cover 400 and / or the upper end cover 500 being capable of reciprocating along the internal channel of the soft sleeve 300, a closed forming space 600 for containing the filter element slurry 20 containing water being formed between the lower end cover 400, the upper end cover 500, the soft sleeve 300 and the center pipe 200, an axial pressure mechanism connected with the lower end cover 400 and / or the upper end cover 500 for driving the lower end cover 400 and the upper end cover 500 to move towards each other along the axial direction of the soft sleeve 300, and a radial pressure mechanism arranged on the outside of the soft sleeve 300 for applying pressure to the inside of the soft sleeve 300 in the radial direction.

[0024] In the process of manufacturing the activated carbon filter element, the skeleton cylinder 10 is sleeved on the center pipe 200, the filter element slurry 20 containing water is poured into the forming space 600, and the water in the filter element slurry 20 is squeezed out in the axial and radial directions by the combined action of the axial pressure mechanism and the radial pressure mechanism, and the squeezed water is sucked away by the negative pressure adsorption mechanism through the drainage holes 201, so that the dehydrated filter element slurry 20 is uniformly and stably attached to the skeleton cylinder 10, the problem that the filter element slurry 20 is easily detached in the traditional rolling forming mode is avoided, and the density of the activated carbon filter element can be increased.

[0025] Referring to Figure 1 and Figure 2In some embodiments of the present application, the radial pressure mechanism comprises a hard sleeve 700 sleeved outside the soft sleeve 300, a closed cavity 701 is formed between the inner circumferential wall of the hard sleeve 700 and the outer circumferential wall of the soft sleeve 300, a plurality of through holes 702 are formed through the outer circumferential wall of the hard sleeve 700 and are in communication with the closed cavity 701, and a hydraulic system is connected to the through holes 702 to tightly clamp the filter core slurry 20 in the forming space 600. It can be understood that, by inputting constant pressure oil into the closed cavity 701 by using the hydraulic system, balanced and stable radial inward pressure can be applied to each position of the outer circumferential wall of the soft sleeve 300, so that the radial size of the forming space 600 is slightly reduced, the moisture of the filter core slurry 20 is squeezed in the radial inward direction of the forming space 600, which helps to ensure that the radius size of the carbon fiber filter core after dehydration is stable, the density of each position in the circumferential direction is consistent, and the quality stability of the final carbon fiber filter core product is ensured. It can be imagined that, in other embodiments, the radial pressure mechanism can also be replaced by a plurality of fan-shaped pressure blocks and a driver for driving the pressure blocks to move close to each other, but the force uniformity of this mode is insufficient compared with the hydraulic system mode.

[0026] Referring to Figure 2 and Figure 3 In some embodiments of the present application, the outer circumferences of the upper end and the lower end of the hard sleeve 700 are respectively provided with a first mounting ring 710 and a second mounting ring 720, the upper end of the soft sleeve 300 is provided with a first annular flange 310 abutting against the first mounting ring 710, and the lower end of the soft sleeve 300 is provided with a second annular flange 320 abutting against the second mounting ring 720. The above structure is beneficial to forming a closed cavity 701 with stable shape, beneficial to tensioning the soft sleeve 300 in the length direction of the soft sleeve 300, avoiding the occurrence of wrinkles, and also ensuring the airtightness of the closed cavity 701.

[0027] Referring to Figure 2 and Figure 3In some embodiments of the present application, the first mounting ring 710 is connected with a first fixing ring 810 for clamping and fixing the first annular flange 310, the second mounting ring 720 is connected with a second fixing ring 820 for clamping and fixing the second annular flange 320, the upper end cover 500 can abut against the first fixing ring 810 and seal the upper end of the soft sleeve 300, the upper end cover 500 and / or the hard sleeve 700 is connected with a first lifting driver, the lower end cover 400 is movably arranged in the second mounting ring 720, the center tube 200 is movably arranged in the lower end cover 400, the outer peripheral wall of the lower end cover 400 is in abutment with the inner peripheral wall of the soft sleeve 300, and the lower end cover 400 is connected with a second lifting driver for driving the lower end cover 400 to move up and down along the internal passage of the soft sleeve 300. It should be noted that the first lifting driver and the second lifting driver constitute the above-mentioned axial pressure mechanism. In the process of manufacturing the activated carbon filter element, referring to Figure 1 , the first lifting driver is used to drive the upper end cover 500 to move away from the upper end of the hard sleeve 700, then the skeleton cylinder 10 is arranged on the center tube 200, at this time, the filter element slurry 20 containing water can be poured into the molding space 600, and then the second lifting driver is used to drive the lower end cover 400 to move upward, so as to compress the height dimension of the molding space 600, thereby extruding the water in the filter element slurry 20 in the axial direction of the activated carbon filter element, which is beneficial to improve the density of the activated carbon filter element in the length direction.

[0028] Referring to Figure 2 and Figure 3 In some embodiments of the present application, in order to ensure that the first annular flange 310 is tightly attached to the first mounting ring 710 and the second annular flange 320 is tightly attached to the second mounting ring 720, thereby ensuring the sealing performance of the closed cavity 701, the first fixing ring 810 is provided with a plurality of first through holes spaced along the circumference thereof, the second fixing ring 820 is provided with a plurality of second through holes spaced along the circumference thereof, the first mounting ring 710 is provided with a first threaded column sleeve corresponding to each of the first through holes, and the second mounting ring 720 is provided with a second threaded column sleeve corresponding to each of the second through holes. A fastening screw is arranged in each of the first through holes and screwed into the corresponding first threaded column sleeve, and a fastening screw is arranged in each of the second through holes and screwed into the corresponding second threaded column sleeve. Wherein, the soft sleeve 300 can be made of soft materials such as rubber and silica gel, and when the soft sleeve 300 reaches the service life or the sealing performance is insufficient, the above structure can also realize the replacement of the soft sleeve 300, which is very convenient. Of course, in other embodiments, the first annular flange 310 and the second annular flange 320 can also be installed by means of adhesive fixation.

[0029] Referring to Figure 1 and Figure 2In some embodiments of the present application, the upper end cover 500 comprises a plug head 510 which is in contact with the inner circumferential wall of the first fixing ring 810, and a limiting plate 520 which is connected to the upper end of the plug head 510 and can abut against the upper surface of the first fixing ring 810. The outer circumferential wall of the plug head 510 is provided with a first sealing ring 530 which is in elastic contact with the inner circumferential wall of the first fixing ring 810. The middle part of the plug head 510 is provided with a positioning insertion hole 540 for the upper end of the central pipe 200 to be inserted into. It can be understood that the plug head 510 abuts against the first annular flange 310, and the first sealing ring 530 can prevent the filter core slurry 20 from overflowing from the gap between the plug head 510 and the first fixing ring 810.

[0030] Referring to Figure 2 In some embodiments of the present application, the installation main body 100 comprises a main pipe 110 which is coaxially movably sleeved on the outside of the central pipe 200. The main pipe 110 is provided with the second fixing ring 820. The lower end of the main pipe 110 is connected with a flange seat 120. The internal passage of the main pipe 110 constitutes the adsorption channel 101. The lower end cover 400 is formed on the outer periphery of the upper end of the main pipe 110. The lower end surface of the second fixing ring 820 or the lower end surface of the lower end cover 400 is provided with a second sealing ring which is located on the outer periphery of the main pipe 110. The second lifting driver is connected with the flange seat 120. It can be understood that the second lifting driver drives the flange seat 120, the main pipe 110 and the lower end cover 400 as a whole to move upward to compress the filter core slurry 20 located in the forming space 600. In this process, the main pipe 110 moves upward relative to the central pipe 200, but the internal passage of the main pipe 110 and the internal passage of the central pipe 200 always keep in communication. Under the driving of the negative pressure adsorption mechanism (such as a vacuum pump), the squeezed water can flow through the drain hole 201, the central pipe 200 and the adsorption channel 101 in sequence.

[0031] Referring to Figure 2 In some embodiments of the present application, the upper end of the adsorption channel 101 is provided with a necked portion which matches the outer diameter size of the central pipe 200. The necked portion and the adsorption channel 101 form a limiting step. The lower end of the central pipe 200 is provided with an annular guide portion 210 which is slidably arranged in the adsorption channel 101 and can abut against the limiting step. The adsorption channel 101 is provided with a reset spring 900 which abuts against the installation main body 100 and the annular guide portion 210 at two ends. The reset spring 900 drives the installation main body 100 to move downward relative to the central pipe 200. When the annular guide portion 210 abuts against the limiting step, it plays a role of telescopic limiting. The reset spring 900 helps the installation main body 100 to move downward relative to the central pipe 200.

[0032] Referring toFigure 1 In some embodiments of the present application, the first lifting driver includes two lifting cylinders respectively connected to the upper end cover 500 and the hard sleeve 700, one of the lifting cylinders drives the upper end cover 500 away from the upper end of the central pipe 200, and the other lifting cylinder drives the hard sleeve 700 to move downward relative to the central pipe 200 to expose the middle upper part of the central pipe 200, in this case, the height distance between the upper end cover 500 and the upper end of the central pipe 200 is slightly greater than the length of the skeleton cylinder 10, which helps to insert the skeleton cylinder 10 into the outside of the central pipe 200 by using a mechanical hand during automated production until the lower end of the skeleton cylinder 10 abuts against the upper surface of the upper end cover 500, and then the hard sleeve 700 and the soft sleeve 300 are moved upward together to reset, the user pours the filter core slurry 20 into the outside of the soft sleeve 300, and then the upper end cover 500 closes the upper port of the soft sleeve 300, and then the axial pressure mechanism, the radial pressure mechanism and the negative pressure suction mechanism act synchronously to squeeze the moisture of the filter core slurry 20 and press the filter core slurry 20 onto the skeleton cylinder 10.

[0033] Referring to Figures 1 to 3 The present application also discloses a production method using the wet forming device for increasing the density of activated carbon filter core according to any of the above technical solutions, which comprises the following steps: The filter core slurry 20 is prepared by crushing and grinding raw materials and then mixing them in a solvent to form a filter core slurry 20 containing water, which is used for forming an activated carbon filter core; the skeleton cylinder 10 is sleeved outside the central pipe 200, the filter core slurry 20 is poured into the forming space 600 of the wet forming device, the lower end cover 400 and the upper end cover 500 are driven to approach each other by the axial pressure mechanism, and the radial pressure mechanism applies pressure inwardly toward the soft sleeve 300 in the radial direction, so as to press the filter core slurry 20 in the axial and radial directions of the forming space 600 to squeeze out the moisture in the filter core slurry 20, the squeezed-out moisture is sucked away by the negative pressure suction mechanism through the drain hole 201 of the central pipe 200, and then a filter core semi-finished product stably attached to the outside of the skeleton cylinder 10 is obtained; the filter core semi-finished product is dried, and a non-woven fabric is coated on the outer surface of the dried filter core semi-finished product. The above production method makes the dehydrated filter core slurry 20 uniformly and stably attached to the skeleton cylinder 10, avoids the problem that the filter core slurry 20 is easily caused to fall off in the traditional rolling forming mode, and can increase the density of the activated carbon filter core.

[0034] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0035] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application. The scope of the application is not to be limited by the embodiments shown and described, but only by the claims and their equivalents.

Claims

1. A wet forming device for increasing the density of activated carbon filter elements, characterized by, The wet forming device for increasing the density of activated carbon filter element comprises: a mounting body (100) provided with a suction channel (101) communicated with a negative pressure suction mechanism; a central pipe (200) arranged in the mounting body (100) and having an internal passage communicated with the suction channel (101), the central pipe (200) being provided with a plurality of drainage holes (201) distributed along the length direction of the central pipe (200); a soft sleeve (300) sleeved on the outside of the central pipe (200); a lower end cover (400) and an upper end cover (500) arranged at the two ends of the soft sleeve (300) respectively, the lower end cover (400) and / or the upper end cover (500) being capable of reciprocating along the internal passage of the soft sleeve (300), the lower end cover (400), the upper end cover (500), the soft sleeve (300) and the central pipe (200) surrounding a closed forming space (600) for containing water-containing filter element slurry (20); an axial pressure mechanism connected with the lower end cover (400) and / or the upper end cover (500) for driving the lower end cover (400) and the upper end cover (500) to move towards each other along the axial direction of the soft sleeve (300); and a radial pressure mechanism arranged on the outside of the soft sleeve (300) for applying pressure to the inside of the soft sleeve (300) in the radial direction.

2. The wet forming device for increasing the density of activated carbon filter element according to claim 1, wherein: the radial pressure mechanism comprises a hard sleeve (700) sleeved on the outside of the soft sleeve (300), the inner circumferential wall of the hard sleeve (700) and the outer circumferential wall of the soft sleeve (300) having a closed cavity (701) therebetween, the outer circumferential wall of the hard sleeve (700) being provided with a plurality of through holes (702) communicated with the closed cavity (701), the through holes (702) being connected with a hydraulic system to tightly clamp the filter element slurry (20) in the forming space (600).

3. The wet forming device for increasing the density of activated carbon filter element according to claim 2, wherein: the outer circumferences of the upper end and the lower end of the hard sleeve (700) are respectively provided with a first mounting ring (710) and a second mounting ring (720), the upper end of the soft sleeve (300) is provided with a first annular flange (310) tightly abutting against the first mounting ring (710), and the lower end of the soft sleeve (300) is provided with a second annular flange (320) tightly abutting against the second mounting ring (720).

4. The wet forming device for increasing the density of activated carbon filter element according to claim 3, wherein: The first mounting ring (710) is connected with a first fixing ring (810) for clamping and fixing the first annular flange (310), the second mounting ring (720) is connected with a second fixing ring (820) for clamping and fixing the second annular flange (320), the upper end cover (500) can abut against the first fixing ring (810) and seal the upper end of the soft sleeve (300), the upper end cover (500) and / or the hard sleeve (700) is connected with a first lifting driver, the lower end cover (400) is movably arranged in the second mounting ring (720), the central pipe (200) is movably arranged in the lower end cover (400), the outer peripheral wall of the lower end cover (400) is in contact with the inner peripheral wall of the soft sleeve (300), and the lower end cover (400) is connected with a second lifting driver for driving the lower end cover (400) to move up and down along the internal passage of the soft sleeve (300).

5. The wet forming device for increasing the density of activated carbon filter element according to claim 4, characterized in that: The first fixing ring (810) is provided with a plurality of first through holes spaced along the circumference thereof, the second fixing ring (820) is provided with a plurality of second through holes spaced along the circumference thereof, the first mounting ring (710) is provided with a first threaded column sleeve corresponding to each of the first through holes, and the second mounting ring (720) is provided with a second threaded column sleeve corresponding to each of the second through holes, a fastening screw is arranged in each of the first through holes and screwed into the corresponding first threaded column sleeve, and a fastening screw is arranged in each of the second through holes and screwed into the corresponding second threaded column sleeve.

6. The wet forming device for increasing the density of activated carbon filter element according to claim 4, characterized in that: The upper end cover (500) comprises a plug (510) in contact with the inner peripheral wall of the first fixing ring (810) and a limiting plate (520) connected to the upper end of the plug (510) and capable of abutting against the upper surface of the first fixing ring (810), the outer peripheral wall of the plug (510) is provided with a first sealing ring (530) in elastic contact with the inner peripheral wall of the first fixing ring (810), and the middle part of the plug (510) is provided with a positioning insertion hole (540) for inserting the upper end of the central pipe (200).

7. The wet forming device for increasing the density of activated carbon filter element according to claim 4, characterized in that: The mounting body (100) comprises a main pipe (110) coaxially movably sleeved outside the central pipe (200), the main pipe (110) is provided with a flange seat (120) at the lower end, the internal passage of the main pipe (110) constitutes the adsorption channel (101), the lower end face of the second fixing ring (820) or the lower end face of the lower end cover (400) is provided with a second sealing ring located at the outer periphery of the main pipe (110), and the second lifting driver is connected with the flange seat (120).

8. The wet forming device for increasing the density of activated carbon filter element according to claim 7, characterized in that: The upper end of the adsorption channel (101) is provided with a necking portion matched with the outer diameter size of the central pipe (200), a limiting step is formed between the necking portion and the adsorption channel (101), the lower end of the central pipe (200) is provided with an annular guide portion (210) slidably arranged in the adsorption channel (101) and capable of abutting against the limiting step, the adsorption channel (101) is provided with a reset spring (900) with two ends respectively abutting against the mounting body (100) and the annular guide portion (210), and the reset spring (900) drives the mounting body (100) to move downward relative to the central pipe (200).

9. The wet forming device for increasing the density of activated carbon filter element according to claim 4, characterized in that: The first lifting driver comprises two lifting cylinders respectively connected with the upper end cover (500) and the hard sleeve (700), one of the lifting cylinders drives the upper end cover (500) to move away from the upper end of the central pipe (200), and the other lifting cylinder drives the hard sleeve (700) to move downward relative to the central pipe (200) to expose the middle upper portion of the central pipe (200).

10. A production method using the wet molding apparatus for increasing the density of an activated carbon filter element according to any one of claims 1 to 9, characterized by, The steps include: A filter element slurry (20) is prepared, raw materials are crushed and ground and then mixed in a solvent to form a filter element slurry (20) containing water, and the filter element slurry (20) is used to form an activated carbon filter element; The skeleton cylinder (10) is sleeved outside the central pipe (200), the filter element slurry (20) is put into the forming space (600) of the wet forming device, the lower end cover (400) and the upper end cover (500) are driven to move close to each other by the axial pressure mechanism, and the radial inward pressure is applied to the soft sleeve (300) by the radial pressure mechanism, so that the filter element slurry (20) is extruded in the axial and radial directions of the forming space (600) to extrude the water in the filter element slurry (20), the extruded water is sucked away by the negative pressure adsorption mechanism through the drain hole (201) of the central pipe (200), and then a filter element semi-finished product stably attached to the outside of the skeleton cylinder (10) is obtained. The filter element semi-finished product is dried, and a non-woven fabric is coated on the outer surface of the dried filter element semi-finished product.

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