Melt filtering partition plate of double-stage extruder

Abstract

The utility model relates to a melt filtering partition plate of a double-stage extruder. The melt filtering partition plate comprises a first disc-shaped partition plate and a second disc-shaped partition plate, the first partition plate can be connected with the second partition plate in an inserted mode. The sieve plate part is fixed to the first partition plate and comprises a plurality of connecting rods connected with a body of the first partition plate and sieve plates fixed between the adjacent connecting rods. A smooth countersink is formed in the inner end face of the second partition plate. An annular part is formed on the bottom surface of the smooth counter bore. And the annular part comprises a plurality of radial connecting rods fixedly connected with the body of the second partition plate, and a plurality of ring bodies fixedly connected with the end parts of the convex columns distributed on the radial connecting rods at intervals. After the first partition plate and the second partition plate are fully fixed, inserted and matched, the inner end face of the ring body can make contact with the plate face of the sieve plate. The pressure bearing capacity of the sieve plate can be improved, and the situation that the sieve plate falls off can be effectively restrained.

Description

Technical Field

[0001] The utility model relates to the field of two-stage extruders, and particularly to a melt filtration partition plate of a two-stage extruder. Background Art

[0002] A twin-screw extruder (also known as a two-stage extruder) generally consists of several parts such as a driving device, a feeding device, a barrel, and a screw unit. The functions of each component are similar to those of a single-screw extruder. The difference in its structure from that of a single-screw extruder lies in that there are two parallel screws placed in a barrel with an "∞" cross-section.

[0003] Materials enter the two-stage extruder and are heated and melted. They need to be filtered before being sent to the screw unit for extrusion. The filter of the existing two-stage extruder includes a sieve plate part fixed on the partition plate body. The partition plate body is matched with other fittings of the filter and can be fixed on the filter. The melt needs to pass through the sieve plate on the sieve plate part during the flowing process and flow through the grid holes of the sieve plate. It can be seen that when the melt flows through the sieve plate part, both the whole sieve plate part and the sieve plate on it bear relatively large pressures. Because the sieve plate has a mesh surface structure and the connection between its grid lines and the base body of the sieve plate part is a single-line connection method, it is easy to be torn when bearing relatively large pressures for a long time, causing the sieve plate of the sieve plate part to be separated from the partition plate body. Especially when the viscosity of the melt is relatively large, the pressure borne by the sieve plate will be relatively greater, and the problem of sieve plate shedding is relatively more likely to occur, affecting the normal progress of production. Summary of the Utility Model

[0004] Aiming at the problem that the sieve plate on the filter of the two-stage extruder is prone to shedding, the utility model provides a melt filtration partition plate for a two-stage extruder, which can improve the pressure-bearing capacity of the sieve plate and effectively inhibit the occurrence of sieve plate shedding.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a melt filtration partition plate for a two-stage extruder, comprising a first partition plate and a second partition plate both in a disc shape.

[0006] An annular groove I is formed on the outer end face of the first partition plate. The inner end side of the first partition plate is formed as a smooth cylindrical surface and an annular groove II is formed on the end face of the smooth cylindrical surface. The outer diameter of the smooth cylindrical surface is smaller than the outer diameter of the first partition plate. The sieve plate part is fixedly located between the annular groove I and the annular groove II, and includes multiple connecting rods connected to the body of the first partition plate and a sieve plate fixed between adjacent connecting rods. An externally threaded column extending axially inward is formed at the axial center position on the end face of the smooth cylindrical surface.

[0007] A smooth counterbore is formed on the inner end face of the second partition plate. A ring-shaped portion protruding inward in the axial direction is formed on the bottom surface of the smooth counterbore. The ring-shaped portion includes a plurality of radial connecting rods fixedly connected to the body of the second partition plate, and a plurality of ring bodies fixedly connected to the ends of the convex columns alternately distributed on each radial connecting rod, so that the inner end face of the ring body protrudes axially toward the port side of the smooth counterbore relative to the inner end face of the radial connecting rod.

[0008] A through hole capable of matching with the external thread column is formed at the axial center position on the inner bottom surface of the smooth counterbore. A ring-shaped counterbore is formed on the outer end face of the second partition plate.

[0009] After the smooth column is fully inserted and matched with the smooth counterbore, the ring-shaped portion can extend into the second annular groove, so that the inner end face of the ring body contacts the sieve plate.

[0010] After the external thread column passes through the through hole provided on the bottom surface of the smooth counterbore to the outside of the outer end face of the second partition plate, a nut is matched to connect the first partition plate and the second partition plate into a whole.

[0011] The number of the radial connecting rods is more than the number of the connecting rods, so that the alternating distribution density of the radial connecting rods in the circumferential direction is greater than the alternating distribution density of the connecting rods in the circumferential direction. Generally, the number of the radial connecting rods is more than twice the number of the connecting rods, preferably more than four times.

[0012] Optionally, the ring-shaped portion further includes an inner ring and an outer ring both fixedly connected to the body of the second partition plate. Both ends of each radial connecting rod are fixedly connected to the inner ring and the outer ring respectively. The inner peripheral surface and the outer peripheral surface of the second annular groove are both tapered surfaces. Correspondingly, the outer peripheral surface two of the outer ring and the inner peripheral surface two of the inner ring are both tapered surfaces, and the outer peripheral surface two of the outer ring is in surface contact and matching with the outer peripheral surface of the second annular groove, and the inner peripheral surface two of the inner ring is in surface contact and matching with the inner peripheral surface of the second annular groove. Sealing rings can be fixedly installed on the outer peripheral surface two of the outer ring and the inner peripheral surface two of the inner ring respectively.

[0013] Optionally, a V-shaped groove is formed on the side surface of the convex column to make the middle part of the convex column a weak area, and the elastic deformation of the convex column can be promoted by means of the weak area. In the circumferential direction, the notches of the V-shaped grooves on two adjacent convex columns are opposite to each other.

[0014] After the first partition plate and the second partition plate are fixedly connected into a whole, the elastic force generated by the elastic deformation of the convex column will act on the sieve plate through the ring body, forming an elastic force to resist the flow pressure applied by the molten material on the sieve plate.

[0015] Optionally, both the inner circumferential surface one and the outer circumferential surface one of the annular groove one are conical surfaces.

[0016] Optionally, a boss is formed at the axial center position on the end face of the smooth column, and an annular groove portion is formed at the root of the boss. The external thread column is formed on the end face of the boss. Correspondingly, a boss portion is formed at the axial center position on the inner bottom surface of the smooth counterbore, and the end face of the boss portion is retracted toward the inner bottom surface side of the smooth counterbore relative to the inner end face of the annular portion.

[0017] Multiple-stage through holes are formed on the end face of the boss portion. After the boss and the external thread column are inserted and matched with the multiple-stage through holes, the boss portion can be inserted into the groove portion.

[0018] Optionally, an annular axial flange is formed at the axial center position on the outer end face of the second partition plate. The external thread column can extend into the axial flange and be matched with a nut. A cap is fixedly arranged on the port of the axial flange.

[0019] The beneficial effects of the utility model are as follows: The utility model can improve the pressure-bearing capacity of the sieve plate and effectively prevent the sieve plate from falling off. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the utility model.

[0021] Figure 2 It is a left-view structural diagram of the first partition plate.

[0022] Figure 3 It is a left-view structural diagram of the second partition plate.

[0023] Figure 4 It is a front-view structural diagram of the convex column.

[0024] Figure 5 It is a partial side-view structural diagram of the convex column.

[0025] In the figure: 10 is the first partition plate, 11 is the annular groove one, 111 is the inner circumferential surface one, 112 is the outer circumferential surface one, 12 is the smooth column, 13 is the annular groove two, 14 is the sieve plate portion, 141 is the connecting rod, 142 is the sieve plate, 15 is the groove portion, 16 is the external thread column;

[0026] 20 is the second partition plate, 21 is the smooth counterbore, 22 is the annular portion, 221 is the inner circumferential surface two, 222 is the outer circumferential surface two, 23 is the boss portion, 231 is the multiple-stage through holes, 24 is the radial connecting rod, 25 is the ring body, 26 is the convex column, 261 is the V-shaped groove, 27 is the annular counterbore, 28 is the axial flange, 29 is the cap. Detailed Embodiments

[0027] The structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the ratio relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0028] Such as Figures 1 to 3 shown, a melt filtration partition plate of a two-stage extruder includes a first partition plate 10 and a second partition plate 20 both in a disc shape.

[0029] An annular groove one 11 is formed on the outer end face of the first partition plate 10. The inner circumferential surface one 111 and the outer circumferential surface one 112 of the annular groove one 11 are both conical surfaces to achieve better guidance of the melt flowing along the axial direction and disperse the pressure acting on the edge position of the sieve plate part 14. The inner end side of the first partition plate 10 is formed as a smooth column 12 and an annular groove two 13 is formed on the end face of the smooth column 12. The outer diameter of the smooth column 12 is smaller than the outer diameter of the first partition plate 10. The sieve plate part 14 is fixedly located between the annular groove one 11 and the annular groove two 13, and includes a plurality of connecting rods 141 connected to the body of the first partition plate 10 and a sieve plate 142 fixed between adjacent connecting rods 141.

[0030] An external threaded column 16 extending axially inward is formed at the axial center position on the end face of the smooth column 12.

[0031] A smooth counterbore 21 is formed on the inner end face of the second partition plate 20. An annular portion 22 protruding axially inward is formed on the bottom surface of the smooth counterbore 21.

[0032] The annular portion 22 includes a plurality of radial connecting rods 24 fixedly connected to the body of the second partition plate 20, and a plurality of ring bodies 25 fixedly connected to the ends of protruding columns 26 distributed at intervals on each radial connecting rod 24, so that the inner end face of the ring body 25 protrudes axially toward the port side of the smooth counterbore 21 relative to the inner end face of the radial connecting rod 24.

[0033] A through hole that can be matched with the external threaded column 16 is formed at the axial center position on the inner bottom surface of the smooth counterbore 21. An annular counterbore 27 is formed on the outer end face of the second partition plate 20.

[0034] After the smooth column 12 and the smooth counterbore 21 are fully inserted and matched, the annular portion 22 can extend into the second annular groove 13, so that the inner end surface of the ring body 25 contacts the sieve plate 142.

[0035] After the external thread column 16 passes through the through hole provided on the bottom surface of the smooth counterbore 21 to the outside of the outer end surface of the second partition plate 20, a nut is matched to connect the first partition plate 10 and the second partition plate 20 into a whole.

[0036] The number of the radial connecting rods 24 is more than that of the connecting rods 141, so that the circumferential distribution density of the radial connecting rods 24 is greater than the circumferential distribution density of the connecting rods 141. Generally, the number of the radial connecting rods 24 is more than twice that of the connecting rods 141, and preferably more than four times.

[0037] In the technical solution of the present utility model, the partition plate carrying the sieve plate portion 14 is divided into a first partition plate 10 and a second partition plate 20 that can be assembled into a whole, and the ring body 25 formed on the second partition plate 20 can apply an axial resistance on the sieve plate 142 of the sieve plate portion 14, so that the axial bearing capacity of the sieve plate portion 14 can be improved, and the situation of the sieve plate breaking away can be effectively inhibited.

[0038] To make the assembly tight and reliable, the annular portion 22 further includes an inner ring and an outer ring both fixedly connected to the body of the second partition plate 20. Both ends of each of the radial connecting rods 24 are fixedly connected to the inner ring and the outer ring respectively. At the same time, the inner circumferential surface and the outer circumferential surface of the second annular groove 13 are both conical surfaces. Correspondingly, the outer circumferential surface 222 of the outer ring and the inner circumferential surface 221 of the inner ring are also both conical surfaces, and the outer circumferential surface 222 of the outer ring is in surface contact matching with the outer circumferential surface of the second annular groove 13, and the inner circumferential surface 221 of the inner ring is in surface contact matching with the inner circumferential surface of the second annular groove 13.

[0039] Sealing rings are fixedly embedded on the outer circumferential surface 222 of the outer ring and the inner circumferential surface 221 of the inner ring respectively.

[0040] As Figure 4 、 Figure 5 shown, a V-shaped groove 261 is formed on the side surface of the convex column 26 to make the middle part of the convex column 26 a weak area, and the elastic deformation of the convex column 26 can be promoted by means of the weak area. In the circumferential direction, the notches of the V-shaped grooves 261 on two adjacent convex columns 26 face away from each other.

[0041] After the first partition plate 10 and the second partition plate 20 are fixedly connected as a whole, the elastic force generated due to the elastic deformation of the convex column 26 will act on the sieve plate 142 through the ring body 25, forming an elastic resistance force against the flow pressure exerted by the molten material on the sieve plate 142, which can improve the axial pressure-bearing capacity of the sieve plate part 14 and enhance the effect of preventing the sieve plate 142 from detaching.

[0042] As Figures 1 to 3 shown, a boss is formed on the end face of the smooth column 12 at the axial center position, and an annular groove part 15 is formed at the root of the boss. The external threaded column 16 is formed on the end face of the boss. Correspondingly, a boss part 23 is formed on the inner bottom surface of the smooth counterbore 21 at the axial center position, and the end face of the boss part 23 is recessed toward the inner bottom surface of the smooth counterbore 21 relative to the inner end face of the annular part 22.

[0043] Multiple-stage through holes 231 are formed on the end face of the boss part 23. After the boss and the external threaded column 16 are inserted and matched with the multiple-stage through holes 231, the boss part 23 can be inserted into the groove part 15, so that a tight, stable and reliable assembly relationship is established between the first partition plate 10 and the second partition plate 20.

[0044] An annular axial flange 28 is formed on the outer end face of the second partition plate 20 at the axial center position. The external threaded column 16 can extend into the axial flange 28 and be matched with a nut. A cap 29 is fixedly arranged on the port of the axial flange 28.

[0045] The above embodiments are only illustrative of the principles and effects of the present invention, rather than limiting the present invention. There are many aspects of the present invention that can be improved without departing from the overall idea. Those skilled in this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A melt filtration partition of a two-stage extruder, characterized in that: It includes a first partition plate and a second partition plate, both of which are in the shape of a disc; An annular groove one is formed on the outer end face of the first partition plate; the inner end side of the first partition plate is formed as a smooth column, and an annular groove two is formed on the end face of the smooth column; the outer diameter of the smooth column is smaller than the outer diameter of the first partition plate; the sieve plate part is fixed between the annular groove one and the annular groove two, and includes multiple connecting rods connected to the body of the first partition plate and sieve plates fixed between adjacent connecting rods; an external threaded column extending axially inward is formed at the axial center position on the end face of the smooth column; A smooth blind hole is formed on the inner end face of the second partition plate; an annular part protruding axially inward is formed on the bottom surface of the smooth blind hole; the annular part includes multiple radial connecting rods fixedly connected to the body of the second partition plate, and multiple ring bodies fixedly connected to the ends of the convex columns distributed at intervals on each radial connecting rod, so that the inner end face of the ring body protrudes axially toward the port side of the smooth blind hole relative to the inner end face of the radial connecting rod; a through hole capable of matching with the external threaded column is formed at the axial center position on the inner bottom surface of the smooth blind hole; an annular blind hole is formed on the outer end face of the second partition plate; After the smooth column and the smooth blind hole are fully inserted and matched, the annular part can extend into the annular groove two, so that the inner end face of the ring body contacts the sieve plate; After the external threaded column passes through the through hole provided on the bottom surface of the smooth blind hole to the outside of the outer end face of the second partition plate, a nut is matched and arranged, and the first partition plate and the second partition plate are connected as a whole.

2. The melt filtration partition plate of the two-stage extruder according to claim 1, wherein: The annular part further includes an inner ring and an outer ring both fixedly connected to the body of the second partition plate; both ends of each radial connecting rod are fixedly connected to the inner ring and the outer ring respectively; The inner peripheral surface one and the outer peripheral surface one of the annular groove two are both conical surfaces. Correspondingly, the outer peripheral surface two of the outer ring and the inner peripheral surface two of the inner ring are both conical surfaces, and the outer peripheral surface two is in surface contact and matching with the outer peripheral surface of the annular groove two, and the inner peripheral surface two is in surface contact and matching with the inner peripheral surface of the annular groove two.

3. The melt filtration partition plate of the two-stage extruder according to claim 1 or 2, characterized in that: A V-shaped groove is formed on the side surface of the convex column, so that the middle part of the convex column is formed as a weak area, and the elastic deformation of the convex column can be promoted by means of the weak area; in the circumferential direction, the notches of the V-shaped grooves on two adjacent convex columns face away from each other.

4. The melt filtration partition plate of the two-stage extruder according to claim 1, characterized in that: The inner peripheral surface one and the outer peripheral surface one of the annular groove one are both conical surfaces.

5. The melt filtration partition plate of the two-stage extruder according to claim 1, wherein: A convex platform is formed at the axial center position on the end face of the smooth column, and an annular groove part is formed at the root of the convex platform; the external threaded column is formed on the end face of the convex platform; correspondingly, a convex platform part is formed at the axial center position on the inner bottom surface of the smooth blind hole, and the end face of the convex platform part is retracted toward the inner bottom surface side of the smooth blind hole relative to the inner end face of the annular part; Multiple-stage through holes are formed on the end face of the convex platform part; after the convex platform and the external threaded column are inserted and matched with the multiple-stage through holes, the convex platform part can be inserted into the groove part.

6. The melt filtration partition plate of the two-stage extruder according to claim 5, characterized in that: An annular axial flange is formed at the axial center position on the outer end face of the second partition plate; the external threaded column can extend into the axial flange and be matched with the nut; a cap is fixedly arranged on the port of the axial flange.

7. The melt filtration partition plate of the two-stage extruder according to claim 1, characterized in that: An annular axial flange is formed on the outer end face of the second partition plate at the axial center position; the external thread post can extend into the axial flange and match with a nut; a cap is fixedly arranged on the port of the axial flange.

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