CN219191225U

CN219191225U - High-pressure homogeneous extrusion system for producing heat insulation strips

Info

Publication number: CN219191225U
Application number: CN202223553744.5U
Authority: CN
Inventors: 葛志强
Original assignee: Hubei Bingzhang Technology Co ltd
Current assignee: Hubei Bingzhang Technology Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-16
Anticipated expiration: 2032-12-28

Abstract

The utility model provides a high-pressure homogeneous extrusion system for producing heat insulation strips, and belongs to the technical field of heat insulation strip production equipment. The extrusion screw comprises a main body machine barrel and an extrusion screw rotationally connected in the main body machine barrel, wherein two ends of the main body machine barrel are respectively provided with a feed inlet and a pressure regulating machine head, the extrusion screw is sequentially provided with a heated section, a mixing section and a discharging section along the running direction of materials, the heated section comprises a first rod section and a first spiral guide piece positioned outside the first rod section, the mixing section comprises a second rod section and a second spiral guide piece positioned outside the second rod section, the discharging section comprises a third rod section and a third spiral guide piece positioned outside the third rod section, the head ends of the two spiral guide pieces are connected and then connected with the tail ends of the first spiral guide piece, and the tail ends of the two spiral guide pieces are connected and then connected with the head ends of the third spiral guide piece; at least one spiral guide piece II is provided with a plurality of through flow grooves penetrating through two side surfaces of the spiral guide piece II. The utility model has the advantages of improving the homogenization degree of materials and the like.

Description

High-pressure homogeneous extrusion system for producing heat insulation strips

Technical Field

The utility model belongs to the technical field of heat insulation strip production equipment, and relates to a high-pressure homogeneous extrusion system for heat insulation strip production.

Background

The heat insulation strip adopted in the bridge-cut-off aluminum door and window can separate heat transmission between the section bars of the door and window main body, so that heat conduction between different spaces is reduced, and the energy-saving and environment-friendly effects can be achieved. According to the difference of main materials, the heat insulation strips are divided into two types, namely a PVC type heat insulation strip and a PA66 type heat insulation strip (also called polyamide 66 or nylon 66), and the PA66 is obviously superior to the PVC type heat insulation strip on the basic performance indexes such as toughness, heat insulation effect and the like, so that the PVC type heat insulation strips are basically eliminated by the market at present.

The main materials of the PA66 type heat insulation strip comprise main materials of PA66 monomer, glass fiber, auxiliary materials of lubricant, glass fiber exposure preventing agent, toughening agent, processing aid and the like, the main materials and the auxiliary materials are mixed, then are pressurized and melted by an extruder and extruded by a corresponding die, and are cooled and molded in the process of demolding and after demolding, and the strip-shaped blank is formed by traction (pulling) material collection and then is cut according to the design size; before entering an extruder, the raw materials are metered and fed into a mixer for mixing and homogenizing, and as most of the raw materials are solid and only a relatively small amount of auxiliary materials are liquid, the raw materials are inevitably turned into a lump (or are called caking) when being mixed, and the raw materials are mechanically stirred and homogenized at normal temperature (in a non-melting state), so that caking is difficult to thoroughly eliminate; although the traditional single-screw extruder can eliminate caking in the process of pressurizing and guiding materials, the materials which reach the melting temperature in all materials are liquefied, and the materials cannot be well homogenized again, especially the glass fibers are far from reaching the melting (or softening) temperature in the extruder (about 200 ℃), the glass fibers wrapped in the caking are in a state of flowing along a spiral groove under the guiding action of the screw, the exchange and mixing flow between the materials is not strong, so that the raw materials cannot be well homogenized before entering an extrusion die, and the performance stability of a heat insulation strip product is affected; the problem of agglomeration can be overcome to the interlock between twin-screw extruder because of main and auxiliary screw, and single twin-screw extruder's initial cost and use cost are all far higher than single screw extruder, therefore, to single screw extrusion among the prior art, have its technical defect that exists.

In addition, the control of extrusion pressure is especially critical in the production process of the heat insulation strip, at present, the extrusion pressure is generally controlled by replacing an extrusion head (or replacing a pressure regulating filter plate and a filter screen at the extrusion head), the extrusion pressure is regulated by regulating the size of a material through flow section output by an extruder, the debugging work before the production of the heat insulation strip with different types (such as the section shape of the heat insulation strip, different material proportions and the like) is especially complicated, the extrusion pressure cannot be regulated under the state of no shutdown, and the pressure regulation is realized by simply controlling the rotating speed of the extrusion screw rod very much depending on the experience of an operator (because the change of the rotating speed of the extrusion screw rod is simply controlled, at this moment, the raw material heating temperature, the cooling temperature of an extrusion die and the like all need to be regulated).

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provide a high-pressure homogeneous extrusion system for producing a heat insulation strip, and the technical problem to be solved by the utility model is how to realize remixing and homogenizing of materials in a molten state in a single-screw extrusion system.

The aim of the utility model can be achieved by the following technical scheme: the high-pressure homogeneous extrusion system for producing the heat insulation strip comprises a main body machine barrel and an extrusion screw rod rotationally connected in the main body machine barrel, wherein two ends of the main body machine barrel are respectively provided with a feeding port and a pressure regulating machine head; at least one spiral guide piece II is provided with a plurality of through flow grooves penetrating through two side surfaces of the spiral guide piece II.

Further, the through flow grooves are distributed on one of the second spiral guide pieces, and the second spiral guide piece with the through flow grooves is located behind the other second spiral guide piece.

Further, the first pole section, the second pole section and the third pole section are coaxial in the same diameter.

Further, the screw pitch of the first screw guide piece is gradually reduced from the head end to the tail end, and the screw pitch of the third screw guide piece is gradually reduced from the head end to the tail end.

Further, the spiral space from the head end to the tail end of the spiral guide piece II distributed with the through flow grooves is provided with a plurality of peaks; the screw distance between the two screw guide sheets is a fixed value.

Further, the through flow groove is arranged at the joint of the second spiral guide piece and the second rod section.

After the mixed material enters a heated section after preliminary homogenization, PA66 is heated and melted in the heated section, under the actions of hot melting, pressurization and material guiding of the heated section, after the material enters a material mixing section, as the tail end of the first spiral guide piece is divided into two parts to form two second spiral guide pieces, the pressure between the two second spiral guide pieces also changes along with the change of the spiral distance between the two second spiral guide pieces, so that the material flows back and forth between the two sides of the spiral guide pieces provided with a flow through groove, including forward flow flowing outwards between the two second spiral guide pieces and reverse flow flowing between the two spiral guide pieces from the outer side, the forced flow mixing of the fluid material is realized, and the problem that the fluid material in the traditional single-screw extrusion system can not be well mixed with other materials in the extrusion process after being in a block due to the forward flow only in the extrusion direction is solved; the product stability of the single screw extrusion system is improved.

Further, the pressure regulating head comprises a temporary storage box, a shrinkage cylinder for connecting the main body machine barrel with the temporary storage box and a connecting rod rotatably connected to the tail end of the extrusion screw, a spiral spring is sleeved on the connecting rod, two ends of the shrinkage cylinder are respectively provided with a flaring, and two ends of the spiral spring are respectively extended to the two flaring positions; the spiral groove formed by the adjacent ring gap of the spiral spring is a circulation channel between the two flaring openings; the connecting rod is connected with a pressure regulating plate which is abutted against one end of the spiral spring close to the temporary storage box in a sliding manner, the pressure regulating plate is controlled by a driving unit capable of driving the pressure regulating plate to slide on the connecting rod, and the spiral spring is in a compressed state.

Further, the spiral spring is a hollow pipe, the spiral spring comprises two mutually parallel spiral sections, the joint of the two spiral sections is fixed on the joint rod, two free ends of the spiral spring are respectively connected with a liquid inlet hose and a liquid return hose, and the temperature intervention of extruded materials is realized by circularly flowing liquid heated medium into the hollow cavity of the spiral spring.

Further, the driving unit is a magnetic driving piece.

Further, the driving unit is a hydraulic cylinder.

Through the regulation to coil spring applys extrusion force to control coil spring's adjacent circle interval, and then realize the change of the circulation passageway of ejection of compact, under the certain circumstances of extruder screw rod rotational speed, can be through the size of simple change circulation passageway, the resistance of control ejection of compact, and then the pressure of control ejection of compact, this kind of pressure regulating mode can go on under the state of not shutting down, and this kind of pressure regulating causes the follow-up influence of supporting parameter in other heat insulating strip production processes less.

Drawings

Fig. 1 is a schematic diagram of the structure of a high-pressure homogeneous extrusion system for producing the present insulation bar.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a schematic view of the structure of an extrusion screw.

Fig. 4 is an enlarged view of a portion a in fig. 2.

Fig. 5 is an enlarged view of a portion B in fig. 3.

In the figure, 1, a main body barrel; 11. a feed inlet; 2. extruding a screw; 21. a heated section; 21a, first pole segment; 21b, first spiral guide vane; 22. a mixing section; 22a, second pole segment; 22b, a second spiral guide piece; 23. a discharging section; 23a, a third pole segment; 23b, a spiral guide piece III; 3. a flow through groove; 4. a temporary storage box; 5. a shrink cylinder; 51. flaring; 6. a connecting rod; 7. a coil spring; 71. a flow channel; 72. a pressure regulating plate; 73. a liquid inlet hose; 74. a liquid return hose; 8. and a driving unit.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, fig. 2, fig. 3 and fig. 5, the high-pressure homogeneous extrusion system for producing heat insulation strips comprises a main body machine barrel 1 and an extrusion screw rod 2 rotatably connected in the main body machine barrel 1, wherein two ends of the main body machine barrel 1 are respectively provided with a feed inlet 11 and a pressure regulating head, and the high-pressure homogeneous extrusion system is different from a traditional single screw extrusion system in that: the extrusion screw 2 is sequentially provided with a heated section 21, a mixing section 22 and a discharging section 23 along the running direction of materials, wherein the heated section 21 comprises a first rod section 21a and a first spiral guide piece 21b positioned outside the first rod section 21a, the mixing section 22 comprises a second rod section 22a and two second spiral guide pieces 22b positioned outside the second rod section 22a, the discharging section 23 comprises a third rod section 23a and a third spiral guide piece 23b positioned outside the third rod section 23a, the head ends of the two second spiral guide pieces 22b are connected and then are connected with the tail ends of the first spiral guide pieces 21b, and the tail ends of the two second spiral guide pieces 22b are connected and then are connected with the head ends of the third spiral guide pieces 23 b; at least one spiral guide piece II 22b is provided with a plurality of through flow grooves 3 penetrating through two side surfaces of the spiral guide piece II 22 b.

The extrusion screw 2 is described in detail as: the first pole section 21a, the second pole section 22a, the third pole section 23a, the first spiral guide piece 21b, the second spiral guide piece 22b and the third spiral guide piece 23b are of an integrated structure, the tail end of the first spiral guide piece 21b is divided into two parts to form two second spiral guide pieces 22b, and the early tail ends of the two second spiral guide pieces 22b are smoothly connected with the head end of the third spiral guide piece 23b after being contracted.

In order to avoid the situation that the material at the head end and the tail end of the first spiral guide piece 21b is blocked and remained at the gradual fading position of the spiral space, the through flow groove 3 is preferably arranged at the gradual fading position to avoid the smooth flow of the material at the gradual fading position, and the structure can be adjusted, so that the head end and the tail end of the first spiral guide piece 21b are in a smooth curved shape due to the gradual fading position of the spiral space, and the end of the second spiral guide piece 22b is free from a gradual tiny gap structure.

The through flow grooves 3 are distributed on one of the second spiral guide pieces 22b, and the second spiral guide piece 22b with the through flow grooves 3 is positioned behind the other second spiral guide piece 22 b.

The first pole section 21a, the second pole section 22a and the third pole section 23a are coaxial in the same diameter; the first spiral guide piece 21b gradually reduces from the head end to the tail end, and the third spiral guide piece 23b gradually reduces from the head end to the tail end. Of course, the extrusion screw 2 may be of a multi-path variable diameter configuration based on other properties, but generally maintains the pressure of the material as it enters the compounding section 22 to increase the strength of the material stream and maintain the pressure requirements as it exits.

The spiral space from the head end to the tail end of the spiral guide piece II 22b distributed with the through flow grooves 3 is provided with a plurality of peaks; the screw pitch of the other screw guide piece II 22b is a fixed value. The peak value means that a plurality of screw pitches of the two screw guide pieces 22b are larger, so that the change of the pitch of the two screw guide pieces can have a plurality of cycles from small to large and then from large to small, thereby improving the mixing frequency of materials.

The through flow groove 3 is arranged at the joint of the spiral guide piece II 22b and the rod section II 22 a. The through-flow groove 3 is arranged at the bottom of the second spiral guide piece 22b compared with the bottom of the second spiral guide piece 22b, so that friction of materials caused when the extrusion screw 2 at the notch rotates relative to the inner wall of the main body barrel 1 can be avoided, and compared with the middle of the second spiral guide piece 22b, the probability that the materials are stagnated at the bottom of the groove between the two spiral guide pieces can be reduced.

After the mixed material enters the heated section 21 after preliminary homogenization, PA66 is heated and melted in the heated section 21, and under the actions of hot melting, pressurization and material guiding of the heated section 21, the material enters the mixing section 22, and then the two spiral guide pieces 22b are formed as the tail end of the first spiral guide piece 21b is divided into two parts, and the pressure between the two spiral guide pieces 22b is changed along with the change of the spiral distance between the two spiral guide pieces 22b, so that the material flows back and forth between the two sides of the spiral guide piece provided with the through groove 3 through the through groove 3, including the forward flow flowing outwards between the two spiral guide pieces 22b and the reverse flow flowing between the two spiral guide pieces from the outer side, thereby realizing the forced mixing of the fluid material, and overcoming the problem that the fluid material in the traditional single screw extrusion system cannot be well mixed with other materials in the extrusion process after being in blocks due to the forward flow of the powder in the extrusion direction; the product stability of the single screw extrusion system is improved.

As shown in fig. 2 and 4, the pressure regulating head comprises a temporary storage box 4, a shrinkage cylinder 5 connecting the main body machine barrel 1 and the temporary storage box 4, and a connecting rod 6 rotatably connected to the tail end of the extrusion screw 2, wherein a spiral spring 7 is sleeved on the connecting rod 6, two ends of the shrinkage cylinder 5 are respectively provided with a flaring 51, and two ends of the spiral spring 7 are respectively extended to the two flaring 51; the spiral groove formed by the adjacent ring clearance of the spiral spring 7 is a circulation channel 71 between the two flaring 51; the connecting rod 6 is connected with a pressure regulating plate 72 which is abutted against one end of the spiral spring 7 close to the temporary storage box 4 in a sliding way, the pressure regulating plate 72 is controlled by a driving unit 8 which can drive the pressure regulating plate 72 to slide on the connecting rod 6, and the spiral spring 7 is in a compressed state;

the helical direction of the helical spring 7 is opposite to the helical direction of the extrusion screw 2, which can buffer the material extruded by the extruder, reduce the impact of fluid flow, and especially reduce the negative impact of flow impact on pressure regulation in the initial start-up and exhaust phases.

Because the connecting rod 6 is rotationally connected with the tail end of the extrusion screw 2, the rotation of the extrusion screw 2 does not cause friction between the spiral spring 7 and the inner wall of the shrinkage cylinder 5, so that the spiral spring 7 can be worn with the inner wall of the shrinkage cylinder 5 only in the pressure regulating process; in addition, in this application, a certain gap may exist between the coil spring 7 and the engagement rod 6, and between the coil spring 7 and the inner wall of the shrink cylinder 5, in which case the flow channel 71 is a main channel, and the gap is a flow auxiliary channel in which a material flow exists; because the two ends of the spiral spring 7 extend to the two flares 51, the inlet and the outlet of the circulation channel 71 are smooth, which is also the premise that the spiral spring 7 still occupies the shrink cylinder 5 after extrusion deformation, or the condition that the end part of the spiral spring 7 is irregular and needs to be far away from the shrink cylinder 5, the liquid inlet hose 73 and the liquid return hose 74 are convenient to set and pull, and the middle fixing point of the spiral spring 7 does not influence the export of materials.

The spiral spring 7 is a hollow pipe, the spiral spring 7 comprises two spiral sections which are parallel to each other, the joint of the two spiral sections is fixed on the joint rod 6, two free ends of the spiral spring 7 are respectively connected with a liquid inlet hose 73 and a liquid return hose 74, and the temperature intervention of extruded materials is realized by circulating liquid heated medium flowing into the hollow cavity of the spiral spring 7. The liquid inlet hose 73 and the liquid return hose 74 are respectively communicated with an inlet and an outlet of an oil tank, and the temperature-controlled hot fluid is circularly fed into the spiral spring 7, so that the discharge temperature of the extruder can be interfered.

The driving unit 8 is a magnetic driving piece; that is, an electromagnetic driving block sliding on the connecting rod 6 is arranged on the connecting rod 6 outside the pressure regulating plate 72, and the electromagnetic driving block is driven by the magnetic force generated by an electromagnet.

The driving unit 8 is a hydraulic cylinder; the cylinder body is arranged outside the temporary storage box 4, and the push rod extends into the temporary storage box 4 through sealing treatment and is connected with the pressure regulating plate 72.

The material extruded by the extruder enters the temporary storage box 4 from the flaring 51 at one side far away from the temporary storage box 4 through the circulation channel 71, is fed to the extrusion die after being transferred in the temporary storage box 4, and is subjected to adjustment of extrusion force by applying the extrusion force to the spiral spring 7, so that the adjacent ring distance of the spiral spring 7 is controlled, the change of the circulation channel 71 for discharging is realized, under the condition that the rotating speed of the screw rod of the extruder is fixed, the size of the circulation channel 71 can be simply changed, the resistance of discharging is controlled, and the pressure regulating mode can be carried out in a non-stop state, and the pressure regulating causes smaller influence on the matching parameters in the production process of other heat insulation strips; in the process of passing through the circulation channel 71, the material can be fully contacted with the outer wall surface of the spiral spring 7 through the spiral circulation channel 71, so that the temperature control of the material is more effective and uniform. The cross section of the spiral spring 7 can be round or rectangular, and the pressure regulating amplitude is not large, namely the deformation amplitude of the spiral spring 7 is not large, and the part of the connecting hose can hardly have larger rotation amplitude around the circumferential direction of the connecting pipe, so that the overall reliability is not influenced.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The high-pressure homogeneous extrusion system for producing the heat insulation strip comprises a main body machine barrel (1) and an extrusion screw (2) rotationally connected in the main body machine barrel (1), wherein two ends of the main body machine barrel (1) are respectively provided with a feed inlet (11) and a pressure regulating machine head, the high-pressure homogeneous extrusion system is characterized in that the extrusion screw (2) is sequentially provided with a heat receiving section (21), a mixing section (22) and a discharging section (23) along the material running direction, the heat receiving section (21) comprises a first rod section (21 a) and a first spiral guide piece (21 b) positioned outside the first rod section (21 a), the mixing section (22) comprises a second rod section (22 a) and two second spiral guide pieces (22 b) positioned outside the second rod section (22 a), the discharging section (23) comprises a third rod section (23 a) and a third spiral guide piece (23 b) positioned outside the third rod section (23 a), the first ends of the two second spiral guide pieces (22 b) are connected with the tail ends of the first spiral guide pieces (21 b), and the tail ends of the two second spiral guide pieces (22 b) are connected with the third spiral guide pieces (23 b); at least one second spiral guide piece (22 b) is provided with a plurality of through flow grooves (3) penetrating through the two side surfaces of the second spiral guide piece (22 b).

2. The high-pressure homogeneous extrusion system for producing heat insulation strips according to claim 1, wherein the through-flow grooves (3) are distributed on one of the second spiral guide pieces (22 b), and the second spiral guide piece (22 b) with the through-flow grooves (3) distributed is positioned behind the other second spiral guide piece (22 b).

3. A high pressure homogeneous extrusion system for the production of insulation strips according to claim 1 or 2 wherein said first (21 a), second (22 a) and third (23 a) segments are co-radial.

4. A high pressure homogeneous extrusion system for the production of insulation strips according to claim 1 or 2 wherein the first helical guide (21 b) is tapered from head to tail and the third helical guide (23 b) is tapered from head to tail.

5. The high-pressure homogeneous extrusion system for producing heat insulation strips according to claim 1 or 2, characterized in that the screw pitch of the screw guide piece two (22 b) distributed with the through-flow grooves (3) from the head end to the tail end has a plurality of peaks; the screw pitch of the other screw guide piece II (22 b) is a fixed value.

6. The high-pressure homogeneous extrusion system for producing heat insulation strips according to claim 1 or 2, wherein the through-flow groove (3) is arranged at the joint of the spiral guide piece II (22 b) and the rod section II (22 a).

7. The high-pressure homogeneous extrusion system for producing the heat insulation strips according to claim 1 or 2, wherein the pressure regulating head comprises a temporary storage box (4), a shrinkage cylinder (5) for connecting a main machine barrel (1) and the temporary storage box (4) and a connecting rod (6) rotatably connected to the tail end of the extrusion screw (2), the connecting rod (6) is sleeved with a spiral spring (7), two ends of the shrinkage cylinder (5) are respectively provided with a flaring (51), and two ends of the spiral spring (7) are respectively extended to the two flaring (51); the spiral groove formed by the adjacent ring gaps of the spiral spring (7) is a circulation channel (71) between the two flaring openings (51); the connecting rod (6) is connected with a pressure regulating plate (72) which is abutted against one end of a spiral spring (7) close to the temporary storage box (4) in a sliding manner, the pressure regulating plate (72) is controlled by a driving unit (8) capable of driving the pressure regulating plate (72) to slide on the connecting rod (6), and the spiral spring (7) is in a compressed state;

the spiral direction of the spiral spring (7) is opposite to the spiral direction of the extrusion screw (2).

8. The high-pressure homogeneous extrusion system for producing heat insulation strips according to claim 7, wherein the spiral spring (7) is a hollow tube, the spiral spring (7) comprises two mutually parallel spiral sections, the joint of the two spiral sections is fixed on the joint rod (6), two free ends of the spiral spring (7) are respectively connected with a liquid inlet hose (73) and a liquid return hose (74), and the temperature intervention of extruded materials is realized by circulating liquid heated medium flowing into the hollow cavity of the spiral spring (7).

9. A high-pressure homogeneous extrusion system for the production of insulation strips according to claim 8, characterized in that the drive unit (8) is a magnetic drive.

10. A high-pressure homogeneous extrusion system for the production of insulation strips according to claim 8, characterized in that the drive unit (8) is a hydraulic cylinder.