Filter cartridge forming tool and filter cartridge forming method

Abstract

According to the filter cartridge forming tool and the forming method of the filter cartridge, the structure of the filter cartridge forming tool is improved, and the problem that axial distribution is uneven due to the fact that fiber slurry rapidly falls under the action of gravity is solved. The filter cylinder forming tool comprises a cylindrical filter screen type mold, a vertically-arranged main body frame and an outer cylinder fixedly connected to the main body frame, the mold is inserted into the outer cylinder and can rotate relative to the outer cylinder, the mold is used for limiting a mold cavity, and the top of the mold cavity serves as the feeding side of the filter cylinder forming tool; an outer cavity is defined between the mold and the outer cylinder, a plurality of suction hole groups capable of being communicated with a negative pressure source are formed in the outer cylinder, each suction hole group comprises at least one suction hole, the suction holes are communicated with the outer cavity, and the suction hole groups are distributed in the axial direction of the outer cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of filter cartridge molding, and in particular to a filter cartridge molding tool and a filter cartridge molding method. Background Art

[0002] At present, the molding of inorganic fiber composite filter cartridges (hereinafter referred to as filter cartridges) mainly utilizes negative pressure filtration molding. The molding devices are divided into vertical and horizontal arrangements. During molding, the prepared fiber slurry is injected into the mold. Under the action of negative pressure, the liquid in the fiber slurry is pumped into the transfer tank through the holes on the mold, and the fibers are trapped inside the mold. While the negative pressure filtration is in progress, the mold rotates to make the fibers evenly distributed inside the mold. After drying or sintering, a finished product with certain strength and rigidity is obtained. However, when the vertical arrangement is adopted, during the molding process, the fiber slurry is easily affected by gravity and settles, and the thickness of the produced filter cartridge is uneven. Summary of the invention

[0003] The purpose of the invention is to provide a filter cartridge forming tool and a filter cartridge forming method, and by improving the structure of the filter cartridge forming tool, the problem of uneven axial distribution caused by the rapid falling of fiber slurry under the action of gravity is avoided.

[0004] To achieve the above-mentioned object, the present invention provides a filter cartridge forming tool, comprising a cylindrical filter screen mold, a vertically arranged main frame, and an outer cylinder fixedly connected to the main frame, wherein the mold is inserted into the outer cylinder and can rotate relative to the outer cylinder, the mold is used to define a cavity, and the top of the cavity serves as a feed side of the filter cartridge forming tool;

[0005] An external cavity is defined between the mold and the outer cylinder. The outer cylinder is provided with a plurality of suction hole groups that can be connected to a negative pressure source. The suction hole groups include at least one suction hole that is connected to the external cavity. The plurality of suction hole groups are arranged along the axial direction of the outer cylinder.

[0006] In this solution, a vertically arranged mold is used for molding, which can effectively ensure the straightness of the filter cartridge after molding. At the same time, by setting the external cavity and the mold cavity to be connected, water can be injected into the external cavity and the mold cavity before feeding, so as to form resistance to the sedimentation of the fiber slurry and slow down the sedimentation speed of the fiber slurry; at the same time, through the adsorption of a plurality of suction hole groups distributed at intervals along the axial direction, adsorption force can be formed on the fiber slurry at several axial positions during the descent of the fiber slurry, thereby avoiding the problem of uneven axial distribution caused by the rapid fall of the fiber slurry under the action of gravity.

[0007] Optionally, it further comprises a feeding piece arranged on the feeding side, wherein the feeding piece is arranged on the top of the cavity and is capable of injecting water into the cavity or injecting fiber slurry into the cavity.

[0008] Optionally, each suction hole group includes a plurality of suction holes, and the plurality of suction holes in the same suction hole group are evenly distributed along the circumference of the outer cylinder.

[0009] Optionally, it further comprises a plurality of suction sub-tubes connected to the suction holes in a one-to-one correspondence;

[0010] The suction sub-tubes are all connected to the negative pressure source, and the suction sub-tubes are all provided with valves, and the valves are used to adjust the opening of the suction sub-tubes.

[0011] Optionally, it also includes a fixed expansion shaft member, which can be switched between an external expansion position and a retracted position along the radial direction of the outer cylinder; the expansion shaft member is inserted into the mold cavity and extends axially, and the expansion shaft member constitutes a part of the cavity wall of the mold cavity.

[0012] Optionally, the expansion shaft member includes a plurality of pressure petals, the plurality of pressure petals are used to radially press the filter cartridge, and the plurality of pressure petals are distributed along the circumferential direction;

[0013] The bottom end of the pressing flap axially extends to the outside of the mold and radially turns outward to form a flange, and at least part of the flange directly or indirectly abuts against the lower end surface of the mold in the axial direction;

[0014] In the retracted position, a plurality of flanges abut against each other in sequence along the circumferential direction to form a closed loop; in the outward expansion position, a plurality of flanges are spaced apart in the circumferential direction.

[0015] Optionally, the surface of the flange that abuts against the mold is covered with a seal, and the seal is conformed to the flange.

[0016] Optionally, it further comprises a driving member for driving the mold to rotate, wherein the driving member is arranged at the bottom end of the outer cylinder and the mold;

[0017] A portion of the expansion shaft member vertically passes through the driving member to be located at a lower side of the driving member.

[0018] A filter cartridge molding method, adapted for the filter cartridge molding tool, the filter cartridge molding method comprising:

[0019] Step 10, filling the outer cavity and the mold cavity with water;

[0020] Step 20, feeding and suction, injecting material into the cavity from the top, and opening the suction hole group in sequence from top to bottom.

[0021] Optionally, the filter cartridge forming tool further comprises a connected expansion shaft member, the expansion shaft member can be switched between an external expansion position and a retracted position along the radial direction of the outer cylinder; the expansion shaft member is inserted into the mold cavity and extends axially, and the expansion shaft member constitutes a part of the cavity wall of the mold cavity;

[0022] Both step 10 and step 20 include:

[0023] Step 31, keeping the expansion shaft member in the retracted position;

[0024] Step 32: When the fiber slurry reaches the bottom of the cavity, control the expansion shaft member to be in the outer expansion position.

[0025] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0027] Figure 1 2 is a schematic diagram of the structure of the filter cartridge forming tooling in an embodiment of the present invention, and a front view;

[0028] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the top structure;

[0029] Figure 3 yes Figure 1 An enlarged schematic diagram of a portion of the structure at the bottom;

[0030] Figure 4 yes Figure 1 A top view of

[0031] Figure 5 yes Figure 1 A top view of

[0032] Figure 6 It is a structural schematic diagram of the blanking part;

[0033] Figure 7 It is a structural schematic diagram of the expansion shaft member in the retracted position;

[0034] Figure 8 1. It is a structural schematic diagram of the expansion shaft in the open position;

[0035] Fig. 9 yes Figure 7 Schematic diagram of radial section;

[0036] Fig.10 yes Figure 8Schematic diagram of radial section;

[0037] Fig.11 It is an exploded schematic diagram of the expansion shaft;

[0038] Fig.12 It is a structural schematic diagram of the driving rotating parts.

[0039] Reference numerals:

[0040] 100-main frame; 200-expansion shaft; 201-core rod; 201a-straight rod segment; 201b-conical rod segment; 202-pressure petal; 202-1a-first straight petal segment; 202-1b-first conical petal segment; 202-1c-flange; 202-1d-seal; 203-driving petal; 203-1a-second straight petal segment; 203-1b-second conical petal segment; 204-first driving member; 205-connecting shaft; 300-driving member; 301-second driving member; 302-transmission gear; 303-external gear slewing bearing; 304-supporting connection Connecting plate; 304-1-installation groove; 305-toothless slewing bearing; 400-mold; 401-cavity; 402-external cavity; 500-clamp assembly; 600-outer cylinder; 700-feeding piece; 701-rotating joint; 702-quick-change joint; 703-tee pipe; 704-feeding chute assembly; 704-1a-upper chute plate; 704-1b-lower chute plate; 705-locating pin; 800-suction hole group; 801-suction hole; 802-solenoid valve; 803-suction sub-pipe; 804-suction main pipe; 900-lifting mechanism; 1000-filter cartridge molding tooling. DETAILED DESCRIPTION

[0041] The present invention provides a filter cartridge forming tool and a filter cartridge forming method, and improves the structure of the filter cartridge forming tool to avoid the problem of uneven axial distribution caused by rapid falling of fiber slurry under the action of gravity.

[0042] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] At present, the molding of inorganic fiber composite filter cartridges (hereinafter referred to as filter cartridges) adopts a horizontally arranged molding device, which has the characteristics of relatively uniform molding. However, as the length of the filter cartridge increases, the floor space occupied by the molding device becomes larger, and the mold is affected by gravity, which requires high strength of the mold. The mold deformation increases during the production process, affecting the straightness of the filter cartridge after molding.

[0044] The vertically arranged forming device solves the problem of large mold deformation during the production process and occupies a small area, but the fibers are easily affected by gravity and settle. The thickness of the filter cartridges produced is uneven, often showing a structural feature of being thick at the bottom and thin at the top. The strength levels of the filter cartridges prepared by the above two arrangement processes are uneven, and there are differences in performance and service life.

[0045] In addition, the molding of existing inorganic fiber composite filter cartridges (hereinafter referred to as filter cartridges) is affected by different molding processes, fiber materials, formulas, etc., and the strength of the finished filter cartridges produced by various manufacturers is different. For some filter cartridges with low initial strength, some manufacturers often use a reinforced formula to adsorb on the surface of the filter cartridge substrate through secondary vacuum filtration, or use a sintering process to form a dense layer on the surface of the finished product, so that the filter cartridge meets the strength requirements.

[0046] During the molding process, the fibers are adsorbed and intertwined only by the effect of negative pressure. The pores between the fibers are large and randomly distributed, the inner or outer wall is rough and loose, and the strength of the filter cartridge is low. If secondary sintering is used to improve the overall strength of the filter cartridge, the energy consumption is high and it will cause environmental pollution. It is necessary to increase environmental protection investment to achieve clean production in green factories. Moreover, this type of filter cartridge has large pores between the fibers and low filtration accuracy. After long-term use, fine dust, heavy metals, etc. can easily clog the fiber pores, causing the filter cartridge to fail and fail to reach its designed life, increasing operation and maintenance costs.

[0047] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0048] Please refer to Figures 1 to 12 , Figure 1 2 is a schematic diagram of the structure of the filter cartridge forming tooling in an embodiment of the present invention, and a front view; Figure 2 yes Figure 1 A partial enlarged schematic diagram of the top structure; Figure 3 yes Figure 1 An enlarged schematic diagram of a portion of the structure at the bottom; Figure 4 yes Figure 1 A top view of Figure 5 yes Figure 1 A top view of Figure 6 It is a structural schematic diagram of the blanking part; Figure 7 It is a structural schematic diagram of the expansion shaft member in the retracted position; Figure 8 1. It is a structural schematic diagram of the expansion shaft in the open position; Fig. 9 yes Figure 7 Schematic diagram of radial section; Fig.10 yes Figure 8 Schematic diagram of radial section; Fig.11 It is an exploded schematic diagram of the expansion shaft; Fig.12It is a structural schematic diagram of the driving rotating parts.

[0049] As shown in the figure, in the technical solution of the present application, the filter cartridge forming tool 1000 includes a vertically arranged main frame 100, and an outer cylinder 600 fixedly connected to the main frame 100, and the axis of the outer cylinder 600 extends vertically. The filter cartridge forming tool 1000 also includes a cylindrical filter screen mold 400, which is a conventional mold 400 of the filter cartridge forming tool 1000, and those skilled in the art can choose it by themselves. The mold 400 is inserted into the outer cylinder 600, and the central axis of the mold 400 also extends vertically. The mold 400 and the outer cylinder 600 can be concentrically arranged or eccentrically arranged.

[0050] In this embodiment, a driving member 300 is further included, which is arranged on the main frame 100. The driving member 300 is connected to the mold 400 to drive the mold 400 to rotate relative to the outer cylinder 600. The mold 400 is used to define the cavity 401, and the top of the cavity 401 serves as the feeding side of the filter cartridge forming tool 1000. In this way, when injecting material into the cavity 401, after the fiber slurry contacts the rotating mold 400, it will be attached to the inner wall surface of the mold 400 in the circumferential direction under the action of centrifugal force.

[0051] An external cavity 402 is defined between the mold 400 and the outer cylinder 600, and the external cavity is connected to the internal cavity. This is because the mold 400 is a filter-type structure densely covered with fine filter holes, and the external cavity is connected to the internal cavity through the filter holes.

[0052] The part of the outer cylinder 600 that serves as the wall of the outer cavity 402 is provided with a plurality of suction hole groups 800 that can be connected to the negative pressure source. The suction hole group 800 includes at least one suction hole 801, and the suction hole 801 is connected to the outer cavity 402. The plurality of suction hole groups 800 are arranged along the axial direction of the outer cylinder 600. The suction holes 801 are connected to suction sub-tubes 803 one by one, and the suction sub-tubes 803 are connected to the negative pressure source. The suction sub-tubes 803 can be directly connected to the negative pressure source through an adapter, or the suction sub-tubes 803 can be gathered and connected to at least one suction main pipe 804, and then the suction main pipe 804 is connected to the negative pressure source. After the negative pressure source starts to work, negative pressure can be formed in each suction sub-tube 803, and then negative pressure is formed on the mold cavity 401 through the outer cavity 402. In the example shown in the figure, the suction main pipe 804 is distributed vertically, and the suction sub-pipes 803 are distributed horizontally and parallel to each other. One end of the suction main pipe 804 connected to the negative pressure source is radially located outside the outer cylinder 600 to avoid interference with the outer cylinder 600.

[0053] Optionally, each suction hole group 800 includes a plurality of suction holes 801, and the plurality of suction holes 801 in the same suction hole group 800 are evenly distributed along the circumference of the outer cylinder 600. The number of suction holes 801 can be a cardinality or an even number, so that a uniform negative pressure can be formed on the cavity 401 in the radial direction at the same axial height. Of course, each suction hole group 800 can also be provided with only one suction hole 801, and since the cavity 401 will rotate around its axis, one suction hole 801 can also form uniform suction.

[0054] In the above-mentioned embodiment, the filter cartridge forming tool 1000 further includes a feed piece arranged on the feed side, which is arranged on the top of the cavity 401 and can inject water into the cavity 401 or inject fiber slurry into the cavity 401 .

[0055] In this solution, a vertically arranged mold 400 is used for molding, which can effectively ensure the straightness of the filter cartridge after molding. At the same time, by setting the external cavity 402 and the mold cavity 401 to be connected, water can be injected into the external cavity 402 and the mold cavity 401 before feeding, so as to form resistance to the sedimentation of the fiber slurry and slow down the sedimentation speed of the fiber slurry; at the same time, by adsorbing through a plurality of suction hole groups 800 distributed at intervals along the axial direction, adsorption force can be formed on the fiber slurry at several axial positions during the descent of the fiber slurry, thereby avoiding the problem of uneven axial distribution caused by the rapid fall of the fiber slurry under the action of gravity.

[0056] In other embodiments of the present application, the filter cartridge forming tool 1000 further includes a fixed expansion shaft member 200, which can be directly or indirectly fixed to the main frame 100, and the expansion shaft member 200 can be switched between an external expansion position and a retracted position along the radial direction of the outer cylinder 600. The expansion shaft member 200 can adopt a mechanical expansion shaft structure or a gas expansion shaft structure to achieve radial external expansion and retraction.

[0057] The expansion shaft 200 is inserted into the cavity 401 and extends axially, and the expansion shaft 200 constitutes part of the cavity wall of the cavity 401. In other words, the expansion shaft 200 and the mold 400 form a ring-shaped structure with a horizontal cross section. After the expansion shaft expands radially outward, the ring width of the ring-shaped cavity 401 is reduced, thereby squeezing the formed filter cartridge. After the filter cartridge is squeezed, the density of its fibers increases, so that the gaps between the fibers become smaller, thereby increasing the strength of the filter cartridge.

[0058] During the extrusion process, the mold 400 can also be kept rotating relative to the expansion shaft 200, so that the mold 400 can drive the formed filter cartridge to rotate around the expansion shaft 200, and the expansion shaft 200 can grind the filter cartridge to make the inner wall of the filter cartridge more compact and smooth, further improving the axial and radial uniformity of the filter cartridge, thereby improving the filtering accuracy of the filter cartridge for fine dust during subsequent use, avoiding dust clogging of the filter cartridge, and increasing the service life of the filter cartridge.

[0059] The specific structures of the various components of the filter cartridge forming tool 1000 in the present application are described separately below.

[0060] Cutting parts

[0061] As a specific structure of a material discharge part 700, the material discharge part 700 includes a rotary joint 701, a quick-change joint 702, a tee 703, a material discharge chute assembly 704, and a positioning pin 705. The tee 703 includes two inlets and one outlet, and the two inlets are used to flow into the fiber slurry and water separately. The outlet is connected to the rotary joint 701, and the rotating structure can rotate relative to the tee 703 while maintaining communication with the tee 703. The rotary joint 701 can be a common rotary joint 701, and no special description is made here. The outlet of the tee 703 connected to the fiber slurry can be provided with the aforementioned quick-change joint 702 to improve the efficiency of the connection.

[0062] The lower trough assembly 704 includes an upper trough plate 704-1a and a lower trough plate 704-1b, which are arranged axially upward and downward. The upper trough plate 704-1a and the lower trough plate 704-1b are axially abutted against each other and connected by balls, so that the upper trough plate 704-1a and the lower trough plate 704-1b can rotate relative to each other around their central axis.

[0063] During the fixing process, the upper slot plate 704-1a radially extends beyond the outer side of the lower slot plate 704-1b and is directly or indirectly fixedly connected to the main frame 100. The upper slot plate 704-1a radially extends beyond the outer side of the lower slot plate 704-1b, and this part is fixed to the top of the outer cylinder 600. This effectively enhances the structural stability of the entire lower chute assembly 704 and improves its anti-deformation capability in a complex working environment.

[0064] The lower trough plate 704-1b is provided with the aforementioned positioning pin 705, which can be inserted into the upper end surface of the mold 400 to form a fixed connection. The lower trough assembly encloses the sealed external cavity 402 and the mold cavity 401. The lower trough assembly 704 is also provided with a feed channel, which is connected to the outlet of the three-way pipe 703 through the rotary joint 701.

[0065] Expanding shaft

[0066] In this embodiment, the shaft expansion member 200 is described in detail in a specific implementation manner.

[0067] In this embodiment, the expansion shaft component 200 is arranged at the lower part of the main frame 100, that is, at the bottom end of the mold 400. The expansion shaft component 200 includes a core rod 201, a plurality of pressure flaps 202 and a driving flap 203. The core rod 201 includes a straight rod segment 201a and a tapered rod segment 201b. The straight rod segment 201a is the part of the expansion shaft component 200 built into the mold 400 and vertically penetrates the mold 400. The tapered rod segment 201b is located outside the bottom side of the mold 400 and the outer cylinder 600, and is connected to the first driving member 204. The first driving member 204 can drive the tapered rod segment 201b to move vertically up and down. The straight rod segment 201a is connected to the small diameter end of the tapered rod segment 201b, and the first driving member 204 is connected to the large diameter end of the tapered rod segment 201b.

[0068] In this embodiment, the first driving member 204 is a cylinder and a connecting shaft 205 , and the output end of the cylinder is connected to the large diameter end through the connecting shaft 205 .

[0069] The three pressure flaps 202 are arranged around the core rod 201. The pressure flap 202 includes a first straight flap segment 202-1a and a first conical flap segment 202-1b connected vertically up and down. The first conical flap segment 202-1b forms a sliding fit with the conical rod segment 201b, and the first straight flap segment 202-1a forms a sliding fit with the straight rod segment 201a.

[0070] The horizontal cross section of the straight rod segment 201a is a triangular structure, and the first straight petal segment 202-1a is slidably adapted to the three corners of the triangular structure through sliders arranged thereon. The wall portion of the first straight petal segment 202-1a provided with the slider is an inner petal wall, and in the retracted position, the surfaces where the three inner petal walls are located enclose a space with a horizontal plane as a triangle. Thus, three accommodating cavities are enclosed between the straight rod segment 201a and two adjacent inner petal walls, and the three accommodating cavities each accommodate a driving petal 203.

[0071] The driving petal 203 includes a second straight petal segment 203-1a and a second conical petal segment 203-1b, the second conical petal segment 203-1b is slidably adapted to the conical rod segment 201b, and the second straight petal segment 203-1a is slidably adapted to the straight rod segment 201a. The portion located in the accommodating cavity includes the second straight petal segment 203-1a, the cross-section of the second straight petal segment 203-1a in the horizontal plane is trapezoidal, and has two oppositely arranged oblique petal walls, and the two oblique petal walls are inclined from the inside to the outside toward the side close to each other. The two oblique petal walls are against the inner petal wall located on the same side and slide in the extension direction thereof. The horizontal cross-section of the second straight petal segment 203-1a also includes a long straight wall and a short straight wall connected to the two oblique petal walls.

[0072] The straight rod segment 201a in the triangular structure also includes side walls, which serve as the sides of the triangle. The long straight wall is arranged opposite to the side wall, and is slidably matched with the side wall in the axial and radial directions through corresponding sliding blocks.

[0073] In the above-mentioned embodiment, the expansion shaft member 200 and the mold 400 together enclose and define the mold cavity 401 .

[0074] Specifically, the bottom end of the pressed petal 202 axially extends to the outside of the mold 400 and radially turns outward to form a flange 202-1c, and the flange 202-1c at least partially directly or indirectly abuts against the lower end surface of the mold 400 in the axial direction. The flange 202-1c is arranged at the position where the first straight petal segment 202-1a is connected to the first conical petal segment 202-1b. Thus, it can define the mold cavity 401 together with the mold 400.

[0075] Optionally, the upper surface of each flange 202-1c is covered with a seal 202-1d, which is formed in the same shape as each flange 202-1c and is located between the flange 202-1c and the lower end surface of the mold 400 in the height direction. It is understood that the seal 202-1d and the mold 400 can move relative to each other in the axial direction and radial direction while ensuring sealing performance, for example, a metal skeleton rubber seal or a polytetrafluoroethylene seal can be used. In this way, in this embodiment, the surface of the seal 202-1d away from the flange 202-1c and the mold 400 together enclose and define the cavity 401.

[0076] The specific working process of the expansion shaft member 200 and the specific working process of the retracted position and the external expansion position will be described below.

[0077] Specifically, in the process of switching from the retracted position to the external expansion position, the first driving member 204 drives the core rod 201 to move axially upward to first drive the driving petal 203 to move radially in a direction away from the straight rod segment 201a, that is, to move outward relative to the straight rod segment 201a. When the driving petal 203 moves radially outward, it can push the pressure petal 202 radially outward, so that the pressure petal 202 squeezes the filter cartridge located outside it. Under the radial limitation of the inner surface of the mold 400, the thickness of the filter cartridge becomes thinner and the density increases.

[0078] During the process of switching from the external expansion position to the retracted position, the first driving member 204 falls back, thereby driving the core rod 201 to move axially downward. The downward movement of the core rod 201 first drives the pressure flap 202 to move radially inward, and then the pressure flap 202 compresses the driving flap 203 to return.

[0079] In the retracted position, the flanges 202-1c are mutually abutted in the circumferential direction to form a closed loop, thereby sealing the air passage of the cavity 401. In the external expansion position, the flanges 202-1c are spaced apart in the circumferential direction, and the water in the cavity 401 and the liquid sucked out of the slurry can also overflow from the space to the outside.

[0080] In the above-mentioned embodiment, the pressure flap 202 and / or the driving plate flap are made of oily nylon. Of course, those skilled in the art may also choose other materials.

[0081] Drive parts

[0082] In this embodiment, the outer cylinder 600 and the expansion shaft member 200 are directly or indirectly fixedly connected to the main frame 100 and are fixed parts, and only the cylindrical mold 400 located in the outer cylinder 600 can rotate.

[0083] Since in the technical solution of the present application, a feed piece is provided at the top of the mold 400, and the bottom end of the mold 400 is adapted with the aforementioned expansion shaft piece 200, in this case, how to arrange the driving member 300 to drive the mold 400 to rotate around its central axis is another improvement point of the technical solution of the present application.

[0084] In a specific embodiment, part of the driving member 300 directly or indirectly abuts against the bottom of the outer cylinder 600, and part directly or indirectly abuts against the bottom end surface of the mold 400; the part of the driving member 300 abutting against the outer cylinder 600 does not rotate, and the part abutting against the mold 400 rotates with the mold 400. In this way, the mold 400 can be supported at the bottom of the mold 400, thereby improving the axial support strength of the mold 400.

[0085] The driving member 300 includes at least two bearings, both of which include an inner ring and an outer ring. The two bearings are axially connected and distributed vertically, and their central axes are distributed vertically. The upper bearing is a gearless slewing bearing 305, and the lower bearing is an external gear slewing bearing 303. The driving member 300 also includes a second driving member 301, which is connected to the outer ring of the external gear slewing bearing 303 through a transmission gear 302.

[0086] Specifically, the outer wall of the outer ring of the external gear slewing bearing 303 is provided with convex teeth that can radially mesh with the transmission gear 302, and the output shaft of the second driving member 301 is fixedly connected to the transmission gear 302, and the output shaft extends in the axial direction. In this way, the axial driving force can be converted into the rotation of the mold 400 by adapting the transmission gear 302 to the external gear slewing bearing 303.

[0087] Optionally, the parameters of the transmission gear 302 and the parameters of the external gear slewing bearing 303 may be adjusted to allow the driving member 300 to function as a speed reduction mechanism.

[0088] In a more specific embodiment, the outer gear slewing bearing 303, the supporting connecting plate 304 and the inner and outer rings have a height difference in the vertical direction, so that the outer gear slewing bearing 303 and the gearless slewing bearing 305 can axially support the fixed outer cylinder 600 while also supporting the mold 400; in addition, space can also be provided for the flap outflow layout.

[0089] Specifically, the inner ring of the external gear slewing bearing 303 is lower than its outer ring, the inner ring is fixedly connected to the main frame 100, and the outer ring is transmission-connected to the transmission gear 302. The inner ring and outer ring of the gearless slewing bearing 305 also have a height difference, and the inner ring of the gearless slewing bearing 305 forms a circumferential stop and connection with the outer ring of the external gear slewing bearing 303, thereby forming a follow-up rotation with the outer ring of the external gear slewing bearing 303.

[0090] The upper end surface of the outer ring of the gearless slewing bearing 305 is higher than the upper end surface of its inner ring, thereby forming a staggered step. The outer cylinder 600 is fixed to the upper end surface of the outer ring of the gearless slewing bearing 305. The bottom end of the mold 400 extends to the lower part of the bottom end of the outer tube and is directly or indirectly connected to the inner ring of the gearless slewing bearing 305.

[0091] In one embodiment, the mold 400 is directly fixedly connected to the upper end surface of the inner ring of the gearless slewing bearing 305 .

[0092] Another way is to expand the volume of the external cavity 402, release the design space of the mold 400, and facilitate the installation of the flange 202-1c. A support connecting plate 304 is also provided between the gearless slewing bearing 305 and the external gear slewing bearing 303. The support connecting plate 304 is specifically provided and connected to the lower end surface of the inner ring of the gearless slewing bearing 305, and the upper end surface of the outer ring of the external gear slewing bearing 303 is abutted against each other to form a fixed connection. The lower end surface of the mold 400 is fixedly connected to the support connecting plate 304.

[0093] In the above embodiment, the middle portion of the support connecting plate 304 is a channel, and the channel axially penetrates the support connecting plate 304 to communicate with the inner ring side of the gearless slewing bearing 305 and the geared slewing bearing.

[0094] In the axial direction, the portion of the expansion shaft 200 located at the bottom of the mold 400 passes through the drive member 300 to the side of the drive member 300 away from the mold 400, that is, located at the lower side of the drive member 300. Specifically, the large diameter end of the first conical petal segment 202-1b fixedly connected to the main frame 100 is located at the lower side of the drive member 300 and fixedly connected to the large diameter end.

[0095] Since the mold 400 is axially pressed against the flange 202-1c, the lower side of the flange 202-1c needs to be supported to seal with the mold 400. In the example shown in the figure, the upper surface of the support connecting plate 304 is provided with a mounting groove 304-1, and the channel passes through the bottom wall of the mounting groove 304-1. The portion of the bottom wall of the groove that is not penetrated extends radially to form an annular boss. The lower surface of the flange 202-1c is pressed against the boss. Part of the lower end surface of the mold 400 is fixed to the upper surface of the support connecting plate 304, and part of it is suspended in the notch of the mounting groove 304-1. The upper surface of the flange 202-1c and the portion of the lower end surface of the mold 400 suspended in the notch are in contact through the seal 202-1d, thereby forming a seal.

[0096] In the technical solution of the present application, a filter cartridge molding method is also provided, which can be adapted to the aforementioned filter cartridge molding tool 1000 .

[0097] The forming methods of the filter cartridge include:

[0098] Step 10: Fill the outer cavity 402 and the mold cavity 401 with water;

[0099] Step 20, feeding and suction, injecting material into the cavity 401 from the top, and opening the suction hole group 800 from top to bottom.

[0100] Before step 20, the outer cavity 402 and the mold cavity 401 are filled with water respectively. In order to simplify the structure, the above-mentioned feeding piece can be provided, and the injection piece integrates the functions of water injection and material injection. Other methods can also be used to achieve the requirements of this operation step. After filling with water, the material discharge and suction steps are carried out. In this step, the mold 400 is kept rotating.

[0101] By adding the step of water injection, the vertical settling speed of the fiber slurry is effectively slowed down, which is beneficial to the axial uniformity of the filter cartridge; at the same time, by opening the suction hole group 800 in sequence, the axial uniformity of the filter cartridge can be further improved.

[0102] In the above-mentioned embodiments, the aforementioned suction sub-tubes 803 are all connected to the negative pressure source, and the suction sub-tubes 803 are all provided with valves, and the valves are used to adjust the opening of the suction sub-tubes 803.

[0103] In step 20, the suction hole groups 800 are opened in sequence from top to bottom according to the set suction method. The suction method includes: the opening nodes of two adjacent suction hole groups 800 from top to bottom differ by a first time threshold, and the closing nodes differ by a second time threshold. The range of the first time threshold and the second time threshold can be independently defined according to the set density of the filter cartridge and the axial sedimentation speed of the filter cartridge, wherein the first time threshold range is within the range of 0.1min-2min, and the second time threshold range is within the range of 0.3min-3min. Those skilled in the art can independently adjust according to the axial size of the filter cartridge, the axial spacing size of two adjacent suction hole groups 800, the rotation speed of the mold 400, the fiber slurry sedimentation speed and / or the sedimentation amount.

[0104] Optionally, two axially adjacent suction hole groups 800 are defined as an upper suction hole group 800 and a lower suction hole group 800 , and the upper suction hole group 800 is closer to the feed side in the height direction and is located above the lower suction hole group 800 .

[0105] The opening node of the lower suction hole group 800 is located between the opening node and the closing node of the upper suction hole group 800. That is, in the vertical direction, at least two suction hole groups 800 are kept open at the same time for a period of time. This can be achieved by controlling the upper valve and the lower valve. In this way, the density of the filter cartridge in the axial direction can be made more uniform.

[0106] Optionally, the number of suction hole groups 800 that are simultaneously open gradually increases from high to low. The valve opening of the corresponding suction sub-pipe 803 gradually decreases, and the opening interval between two adjacent valves is a set opening threshold, and the set opening threshold is between 2%-20%; further, the set opening threshold is 10%-15%, and those skilled in the art can set it independently according to the on-site parameters. In this way, it can match the sedimentation of the fiber slurry and ensure its axial uniformity.

[0107] In the example shown in the figure, five suction hole groups 800 are arranged in the height direction. The valves corresponding to the five suction hole groups 800 from top to bottom are 1# electromagnetic valve 802, 2# electromagnetic valve 802, 3# electromagnetic valve 802, 4# electromagnetic valve 802 and 5# electromagnetic valve 802. The time point when the blank 700 starts to inject material into the cavity 401 is the timing zero point. The 1# electromagnetic valve 802 is opened between 0min and 3min, and the valve opening of the 1# electromagnetic valve 802 is 100%; at 2 Min to 5.5min, open 2# solenoid valve 802, and the valve opening degree of 2# solenoid valve 802 is 90%; between 3min to 6min, open 3# solenoid valve 802, and the valve opening degree of 3# solenoid valve 802 is 75%; between 4min to 7min, open 4# solenoid valve 802, and the valve opening degree of 4# solenoid valve 802 is 65%; between 4.5min to 8min, open 5# solenoid valve 802, and the valve opening degree of 5# solenoid valve 802 is 50%.

[0108] By adopting the technical method in the present application, by controlling the opening time and opening degree of the valve, setting the opening time of the suction hole group 800 in a gradient, or simultaneously performing gradient control on the opening time and valve opening degree of the suction hole group 800, it is possible to significantly balance the effect of gravity on the fibers and make the fibers evenly distributed inside the mold 400.

[0109] During the suction process of the suction hole group 800, the liquid injected into the mold cavity 401 and the external cavity 402 before feeding is extracted, and the slurry in the fiber slurry can be extracted, so that the fibers are trapped inside the mold 400 to initially form a filter cartridge. After the fiber slurry is injected, the feed piece is closed.

[0110] In another filter cartridge molding method, both step 10 and step 20 include: step 31, keeping the expansion shaft member 200 in the retracted position; step 32, when the fiber slurry reaches the bottom of the cavity 401, controlling the expansion shaft member 200 to be in the external expansion position, thereby further compressing the molded filter cartridge.

[0111] In this embodiment, step 40, demoulding and baking is also included, wherein the mold 400 and the formed filter cartridge are taken out from the outer cartridge 600 and then baked. In step 40, the expansion shaft member 200 also needs to be kept in the retracted position or in the non-expanded position.

[0112] The following is a detailed description of the filter cartridge molding method of the present application using a specific example. Specifically, it also includes a lifting mechanism 900, which is arranged at the top of the filter cartridge molding tool 1000 to lift and lower the mold 400.

[0113] During use, the mold 400 is first placed vertically into the outer cylinder 600 using the lifting mechanism 900, and the blanking piece 700 is inserted into the top of the mold 400. The blanking piece 700 is also provided with a clamp assembly 500, and those skilled in the art can select the type of the clamp assembly 500. After the blanking piece 700 is set at the top of the mold 400, the upper groove plate 704-1a of the blanking piece 700 is clamped and fixed to the main frame 100 using the clamp assembly 500. The bottom of the mold 400 is connected to the driving member 300, and at this time, the flaps are circumferentially against each other to form a closed loop, thereby surrounding the molding cavity 401 with the mold 400.

[0114] The second driving member 301 is started to drive the transmission gear 302, the external gear slewing bearing 303 and the supporting connecting plate 304 to rotate, thereby driving the mold 400 to rotate at a first rotation speed, which is 150r / min-200r / min. This ensures that the fiber slurry is evenly distributed in the circumferential direction at the same height.

[0115] After all the fiber slurry is injected, the outlet of the three-way pipe 703 is closed. The second driving member 301 is closed, and the first driving member 204 is started to push the core rod 201, so that the pressure flap 202 is in an expanded state, and the formed filter cartridge is squeezed.

[0116] After extruding to the set first density threshold range, the second driving member 301 is started to rotate the mold 400 at the second rotation speed. The first density threshold range is such that when the mold 400 rotates around the expansion shaft member 200, the expansion shaft member 200 and the inner wall of the filter cartridge will not be relatively damaged. The second rotation speed is 20r / min-30r / min, and the solenoid valve 802 of the suction hole group 800 is opened at the same time, and the valve opening is 100% to quickly suck the extruded liquid.

[0117] After the extrusion is completed, the mold 400 is further rotated at a third rotation speed. The third rotation speed is 0.5 r / min-1 r / min, so that the pressure flap 202 has a grinding effect on the inside of the filter cartridge.

[0118] After completing the above operations, pull down the core rod 201 to radially switch the pressure flap 202 to the retracted position, open the clamp assembly 500, take out the blank 700, use the lifting mechanism 900 to take out the mold 400, and put it into the oven for baking.

[0119] Compared with the prior art, the technical solution of the present application solves the problem of poor straightness of the filter cartridge by a vertically arranged molding device. By arranging a plurality of suction hole groups 800 in the vertical direction of the mold 400, the different opening time and valve opening of each suction hole group 800 are adjusted. At the same time, the entire inner cavity of the mold 400 is filled with clean water before injecting the fiber slurry, thereby solving the problem of uneven distribution of fibers due to gravity. At the same time, an expansion shaft 200 is provided to extrude and polish the filter cartridge after preliminary molding. After extrusion and polishing, the gaps between the fibers of the filter cartridge become smaller, the fibers are more closely interwoven, and the inner wall is compact and smooth. The strength of the filter cartridge after extrusion and polishing is increased and the strength of each area is more uniform, thereby improving the filtration of fine dust, avoiding dust clogging of the filter cartridge, and increasing the service life of the filter cartridge.

[0120] In addition, the filter cartridge after extrusion and grinding has no undesirable structures such as bumps and holes, which reduces the blowing resistance during the subsequent use of the filter cartridge and is conducive to the diffusion of the blowing airflow; through the suction and water removal processes, the moisture content of the filter cartridge is low and the drying time is reduced; the overall strength of the filter cartridge after drying is stronger and more uniform than that of the non-extruded filter cartridge, and no secondary sintering is required, which achieves energy saving and carbon reduction in the production process and avoids the pollution of the environment caused by the filter cartridge sintering production process.

[0121] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A filter cartridge forming tool, characterized in that: It comprises a cylindrical filter-type mold (400), a main body frame (100) arranged vertically, and an outer cylinder (600) fixedly connected to the main body frame (100), the mold (400) being inserted into the outer cylinder (600) and being rotatable relative to the outer cylinder (600), and the mold (400) defining a mold cavity (401); An external cavity (402) is defined between the mold (400) and the outer cylinder (600); the outer cylinder (600) is provided with a plurality of suction hole groups (800) that can be connected to a negative pressure source; the suction hole groups (800) include at least one suction hole (801); the suction hole (801) is connected to the external cavity (402); and the plurality of suction hole groups (800) are distributed at intervals along the axial direction of the outer cylinder (600).

2. The filter cartridge forming tool according to claim 1, characterized in that: It also comprises a feeding piece arranged at the top of the cavity (401), and the feeding piece is used to inject water into the cavity (401), or inject fiber slurry into the cavity (401).

3. The filter cartridge forming tool according to claim 1, characterized in that: Each suction hole group (800) comprises a plurality of suction holes (801), and the plurality of suction holes (801) located in the same suction hole group (800) are evenly distributed along the circumference of the outer cylinder (600).

4. The filter cartridge forming tool according to claim 1, characterized in that: It also includes a plurality of suction sub-tubes connected to the suction holes (801) in a one-to-one correspondence; The suction sub-tubes are all connected to the negative pressure source, and the suction sub-tubes are all provided with valves, and the valves are used to adjust the opening of the suction sub-tubes.

5. The filter cartridge forming tool according to any one of claims 1 to 4, characterized in that: It also includes an expansion shaft component (200), which can be displaced along the radial direction of the outer cylinder (600) to switch between an external expansion position and a retracted position; the expansion shaft component (200) is inserted into the mold cavity (401) and extends axially, and the expansion shaft component (200) constitutes a part of the cavity wall of the mold cavity (401).

6. The filter cartridge forming tool according to claim 5, characterized in that: The expansion shaft component (200) comprises a plurality of pressure flaps (202), and the plurality of pressure flaps (202) are used to radially press the filter cartridge; The bottom end of the pressing flap (202) vertically extends to the outside of the mold (400) and radially turns outward to form a flange (202-1c), and at least a portion of the flange (202-1c) directly or indirectly abuts against the lower end surface of the mold (400) in the axial direction; In the retracted position, a plurality of flanges (202-1c) abut against each other in sequence along the circumferential direction to form a closed loop; and in the outward expansion position, a plurality of flanges (202-1c) are spaced apart in the circumferential direction.

7. The filter cartridge forming tool according to claim 6, characterized in that: The surface of the flange (202-1c) that abuts against the mold (400) is covered with a sealing member (202-1d), and the sealing member (202-1d) is conformally formed with the flange (202-1c).

8. The filter cartridge forming tool according to claim 7, characterized in that: It also includes a driving member (300) for driving the mold (400) to rotate, wherein the driving member (300) is arranged at the bottom ends of the outer cylinder (600) and the mold (400); Part of the expansion shaft member (200) passes through the driving member (300) in the vertical direction to be located at the lower side of the driving member (300).

9. A method for forming a filter cartridge, characterized in that: A filter cartridge forming tool adapted for use in any one of claims 5 to 8, wherein the filter cartridge forming method comprises: Step 10: filling the outer cavity (402) and the mold cavity (401) with water; Step 20, feeding and suction, injecting material into the cavity (401) from the top, and opening the suction hole group (800) in sequence from top to bottom.

10. The method for forming a filter cartridge according to claim 9, characterized in that: The filter cartridge forming tool further comprises a connected expansion shaft component (200), wherein the expansion shaft component (200) can be switched between an external expansion position and a retracted position along the radial direction of the outer cylinder (600); the expansion shaft component (200) is inserted into the mold cavity (401) and extends in the axial direction, and the expansion shaft component (200) constitutes a part of the cavity wall of the mold cavity (401); Both step 10 and step 20 include: Step 31, maintaining the expansion shaft member (200) in the retracted position; Step 32: When the fiber slurry reaches the bottom of the mold cavity (401), the expansion shaft component (200) is controlled to be in the outer expansion position.

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