阅读说明：本技术 具有排气功能的螺杆挤出装置 (Screw extrusion device with exhaust function ) 是由 徐文良 何建领 李明 刘俊 庞阳 肖宇韬 肖志林 于 2019-11-25 设计创作，主要内容包括：一种具有排气功能的螺杆挤出装置,属于塑料挤出装置技术领域。包括机筒和进料筒；螺杆和螺杆驱动机构；一组加热圈,设在机筒外；一组螺杆温区温度调节控制机构,与隔热圈固定；料斗,对应于进料筒的位置设置；特点：还包括有水冷却机构,其设在进料筒外,料斗在对应于进料筒的位置与水冷却机构固定且与进料筒腔相通；排气口开设在机筒的长度方向朝向上的一侧的中部且与一组加热圈中的位于中部的两相邻加热圈之间的出风腔对应,机筒腔对应于位于中部的两相邻加热圈之间的区域构成为排气口区域,螺杆对应于排气口区域的部位的直径小于螺杆位于所述机筒腔内的其它部位的直径。保障塑料制品的质量和强度；保障进料的顺畅效果。(A screw extrusion device with an exhaust function belongs to the technical field of plastic extrusion devices. Comprises a machine barrel and a feeding barrel; a screw and a screw drive mechanism; a group of heating rings arranged outside the machine barrel; the screw temperature zone temperature adjusting and controlling mechanism is fixed with the heat insulation ring; the hopper is arranged corresponding to the position of the feeding cylinder; the method is characterized in that: the hopper is fixed with the water cooling mechanism at the position corresponding to the feeding cylinder and is communicated with the cavity of the feeding cylinder; the air outlet is formed in the middle of one side, facing upwards in the length direction, of the machine barrel and corresponds to an air outlet cavity between two adjacent heating rings in the middle of the group of heating rings, the area, corresponding to the middle of the machine barrel cavity, between the two adjacent heating rings is formed into an air outlet area, and the diameter of the part, corresponding to the air outlet area, of the screw is smaller than the diameter of the other parts, located in the machine barrel cavity, of the screw. The quality and the strength of the plastic product are guaranteed; the smooth and easy effect of feeding is ensured.)

1. A screw extrusion device with an exhaust function comprises a machine barrel (1) and a feeding barrel (2), wherein the left end of the feeding barrel (2) is matched and connected with the right end of the machine barrel (1), a feeding barrel cavity (21) of the feeding barrel (2) is communicated with a machine barrel cavity (11) of the machine barrel (1), a machine barrel melt extrusion head (12) is matched and connected with the left end of the machine barrel (1), an exhaust port (13) is formed in the machine barrel (1), and an exhaust pipe (131) communicated with the machine barrel cavity (11) is arranged at a position corresponding to the exhaust port (13); a screw (3) and a screw driving mechanism (4), wherein the screw (3) is arranged in the barrel cavity (11), the left end of the screw (3) extends out of the barrel cavity (11) and extends to the barrel melt extrusion head (12), the right end of the screw (3) extends out of the feeding barrel cavity (21) and is formed with a screw head (31), the screw head (31) is in transmission connection with the screw driving mechanism (4), and the screw driving mechanism (4) is arranged on the frame in a use state; the heating device comprises a group of heating rings (5), the heating rings (5) are distributed at intervals in a state of corresponding to each temperature zone of the screw (3) and are arranged outside the machine barrel (1), an annular cavity (51) is respectively formed on the inner wall of the heating rings (5) and is positioned in the middle of the heating rings (5) in the length direction around the heating rings (5), ventilating grooves (511) are respectively formed at two sides of the cavity wall of the annular cavity (51) at intervals, a heat insulating ring (52) is respectively arranged outside the heating rings (5), the space between every two adjacent heating rings (5) is formed into an air outlet cavity (53), and the air outlet cavity (53) is communicated with the ventilating grooves (511); the number of the screw temperature zone temperature adjusting and controlling mechanisms (6) is equal to that of the heating rings (5), and the screw temperature zone temperature adjusting and controlling mechanisms are fixed with the heat insulation rings (52) and communicated with the annular cavity (51); a hopper (7), wherein the hopper (7) is arranged corresponding to the position of the feeding cylinder (2); the device is characterized by also comprising a water cooling mechanism (8), wherein the water cooling mechanism (8) is arranged outside the feeding cylinder (2), and the hopper (7) is fixed with the water cooling mechanism (8) at a position corresponding to the feeding cylinder (2) and is communicated with the feeding cylinder cavity (21); the air outlet (13) is arranged in the middle of one side of the machine barrel (1) facing upwards in the length direction and corresponds to the air outlet cavity (53) between two adjacent heating rings in the middle of the group of heating rings (5), the area of the machine barrel cavity (11) corresponding to the area between the two adjacent heating rings in the middle is formed into an air outlet area (111), and the diameter of the part of the screw (3) corresponding to the air outlet area (111) is smaller than that of the other parts of the screw (3) in the machine barrel cavity (11).

2. The screw extrusion apparatus with a vent function according to claim 1, wherein a fan attachment seat (54) is formed on each of said plurality of heating rings (5) and at a position corresponding to said plurality of screw warm zone temperature adjusting and controlling means (6), said fan attachment seat (54) is formed with an attachment seat air intake chamber (541), said attachment seat air intake chamber (541) communicates with said annular chamber (51), and said plurality of screw warm zone temperature adjusting and controlling means (6) is fixed to said heat insulating ring (52) at a position corresponding to said fan attachment seat (54).

3. Screw extrusion apparatus with venting function according to claim 2, wherein said set of screw temperature zone temperature regulating and controlling means (6) each comprises a motor (61) and a fan (62), the motor (61) is in driving engagement with the fan (62) and is fixed to said heat insulating ring (52) by the fan (62) together with the motor (61) at a position corresponding to said fan adapter (54), and the fan outlet of the fan (62) is in communication with said adapter air inlet chamber (541).

4. Screw extrusion apparatus with venting function according to claim 1, characterised in that the left end of the feed cylinder (2) is fixed to the right end face of the barrel (1) by a feed cylinder fixing screw (22).

5. Screw extrusion apparatus with venting function according to claim 1, wherein the water cooling mechanism (8) comprises a sleeve (81) and a water jacket (82), the water jacket (82) being disposed outside the sleeve (81), the space between the inner wall of the water jacket (82) and the outer wall of the sleeve (81) is formed as a water cooling chamber (83), and a water inlet pipe joint (821) and a water outlet pipe joint (822) are formed on the water jacket (82), the water inlet pipe interface (821) and the water outlet pipe interface (822) are communicated with the water cooling cavity (83), and is connected with a water circulation water supply device pipeline in a use state, the left end of the sleeve (81) is fixed with the right end of the machine barrel (1) through a sleeve left fixing screw (811), the right end of the sleeve (81) is fixed with the right end of the feeding cylinder (2) through a sleeve right fixing screw (812); the hopper (7) communicated with the feeding cylinder cavity (21) is fixed with the sleeve (81); a flat key (311) is formed on the screw head (31) at the right end of the screw (3).

6. Screw extrusion apparatus with venting function according to claim 5, characterised in that a feed pipe adapter (813) is formed on the side of the sleeve (81) facing upwards and in a position corresponding to the hopper (7), a feed pipe (8131) is fixed to the feed pipe adapter (813), and the lower part of the hopper (7) is flanged to the feed pipe (8131), wherein the feed pipe cavity (81311) of the feed pipe (8131) communicates with the feed pipe adapter cavity (8132) of the feed pipe adapter (813), and the feed pipe adapter cavity (8132) communicates with the feed cylinder inlet (23) provided on the feed cylinder (21), which feed cylinder inlet (23) communicates with the feed cylinder cavity (21).

7. Screw extrusion apparatus with degassing function according to claim 5, characterised in that the water receiving pipe interface (821) and the water outlet pipe interface (822) are in a diagonally disposed positional relationship with each other on the water jacket (82).

8. Screw extrusion apparatus with air exhaust function according to claim 5, characterized in that a screw shaft seat connecting flange (814) is fixed at the right end of the sleeve (81), the screw shaft head (31) of the screw (3) extends to the screw shaft seat (312), the screw shaft seat (312) is fixed with the screw shaft seat connecting flange (814) by a screw shaft seat fixing screw (3121), and the screw shaft head (31) is in transmission connection with the screw driving mechanism (4) at the position of the screw shaft seat (312).

9. The screw extrusion device with the air exhaust function according to claim 8, wherein the screw driving mechanism (4) comprises a reduction gearbox driving wheel (41) and a reduction gearbox (42), the reduction gearbox (42) is fixed with the frame under use, a reduction gearbox power output shaft (421) of the reduction gearbox (42) extends to the screw shaft seat (312) at a position corresponding to the screw shaft head (31), the screw shaft head (31) is in transmission connection with the reduction gearbox power output shaft (421), the reduction gearbox driving wheel (41) is fixed with a reduction gearbox power input shaft (422) of the reduction gearbox (42), and the reduction gearbox driving wheel (41) is in transmission connection with the driving motor through a transmission belt under use.

10. Screw extrusion apparatus with venting function according to claim 1, characterised in that the region of the screw (3) corresponding to the venting zone (111) has a smaller diameter than the other regions of the screw (3) located in the barrel chamber (11)To

Technical Field

The invention belongs to the technical field of plastic extrusion devices, and particularly relates to a screw extrusion device with an exhaust function.

Background

As is known in the art, in the melt extrusion process of conventional, especially damp plastics, into a screw extruder, gas is generated after water evaporation, and if the gas is not discharged, bubbles are generated on the surface and in the preform, which affects quality and strength.

In order to solve the problems, the "vented differential twin-screw extruder" recommended by CN102205619A is provided with a vent communicated with the cavity of the machine barrel, and the gas in the cavity of the machine barrel is exhausted through the vent; CN206186319U 'polyester stretched film production line high dehumidification exhaust type double screw extruder' is provided with exhaust ports communicated with a cylinder cavity of a cylinder corresponding to each temperature zone in the length direction of the cylinder so as to discharge gas; the vented single-screw extruder specially used for returned material granulation introduced in CN208730059U is provided with a natural vent hole and a vacuum hole which are communicated with a cavity of a machine barrel.

As determined by a reading of the above-listed patents, but not limited thereto: the gas in the cavity of the machine barrel is exhausted to the outside through a gas outlet formed on the machine barrel, and the factors influencing the quality and the strength are eliminated. However, there are the following general disadvantages: firstly, because the diameters of the screws in the aforementioned patent are the same whether the screws are single screws or double screws, and the gaps formed between the outer wall of the screw rod body and the inner wall of the charging barrel are the same, the pressure in the charging barrel corresponding to the area of the air outlet is basically the same as the pressure in other areas, thus the air is not favorable for forming an air cavity in the area of the air outlet and being smoothly discharged from the air outlet, and the effect of eliminating the influence on the quality and the strength of the plastic product cannot reach the expectation; secondly, because the heating ring is arranged outside the machine barrel, the temperature difference between the heating ring and the feeding barrel in the feeding area is very different, and the temperature of the machine barrel is suddenly increased relative to the feeding barrel, so that materials are mutually bonded in the feeding barrel area, particularly a feeding hole, and are integrated on a feeding barrel cavity of the feeding area, and unsmooth material guiding and even blockage can occur for a long time, great troubles are caused for equipment maintenance and overhaul, and the normal working efficiency of the equipment is influenced. There is no suggestion in the prior art patent and non-patent documents that the aforementioned technical problems can be solved, and the technical solutions to be described below are made in this context.

Disclosure of Invention

The invention aims to provide a screw extrusion device with an air exhaust function, which is beneficial to forming an air cavity in an air exhaust opening area and smoothly exhausting air formed after water in a plastic melt is evaporated to the outside through the air exhaust opening, and is beneficial to eliminating the influence of the suddenly increased temperature of a machine barrel on a feeding barrel area and causing mutual adhesion of materials so as to ensure the smooth feeding effect.

The invention is to accomplish the task in such a way that a screw extrusion device with an exhaust function comprises a machine barrel and a feeding barrel, wherein the left end of the feeding barrel is matched and connected with the right end of the machine barrel, a feeding barrel cavity of the feeding barrel is communicated with the machine barrel cavity of the machine barrel, a machine barrel melt extrusion head is matched and connected with the left end of the machine barrel, an exhaust port is arranged on the machine barrel, and an exhaust pipe communicated with the machine barrel cavity is arranged at a position corresponding to the exhaust port; the screw is arranged in the cylinder cavity, the left end of the screw extends out of the cylinder cavity and extends to the cylinder melt extrusion head, the right end of the screw extends out of the feeding cylinder cavity and forms a screw shaft head, the screw shaft head is in transmission connection with the screw driving mechanism, and the screw driving mechanism is arranged on the rack in a use state; the heating rings are distributed at intervals in a state of corresponding to each temperature zone of the screw and are arranged outside the machine barrel, an annular cavity is respectively arranged on the inner wall of each heating ring and in the middle of the heating rings in the length direction around the heating rings, ventilation grooves are respectively arranged at intervals on two sides of the cavity wall around the annular cavity, a heat insulation ring is respectively arranged outside each heating ring, and a space between every two adjacent heating rings is formed into an air outlet cavity which is communicated with the ventilation grooves; the number of the screw temperature zone temperature adjusting and controlling mechanisms is equal to that of the heating rings, and the screw temperature zone temperature adjusting and controlling mechanisms are fixed with the heat insulation rings and communicated with the annular cavity; the hopper is arranged corresponding to the position of the feeding cylinder; is characterized by also comprising a water cooling mechanism which is arranged outside the feeding cylinder, and the hopper is fixed with the water cooling mechanism at the position corresponding to the feeding cylinder and is communicated with the cavity of the feeding cylinder; the air outlet is formed in the middle of one side of the machine barrel facing upwards in the length direction and corresponds to the air outlet cavity between two adjacent heating rings in the middle of the group of heating rings, the area of the machine barrel cavity corresponding to the area between the two adjacent heating rings in the middle is formed into an air outlet area, and the diameter of the part of the screw corresponding to the air outlet area is smaller than that of the other parts of the screw in the machine barrel cavity.

In a specific embodiment of the invention, a fan matching seat is respectively formed on the group of heating rings and at the position corresponding to the group of screw temperature zone temperature adjusting and controlling mechanisms, the fan matching seat is formed with a matching seat air inlet cavity, the matching seat air inlet cavity is communicated with the annular cavity, and the group of screw temperature zone temperature adjusting and controlling mechanisms are fixed with the heat insulation ring at the position corresponding to the fan matching seat.

In another specific embodiment of the present invention, each of the screw temperature zone temperature adjusting and controlling mechanisms includes a motor and a fan, the motor is in transmission fit with the fan and is fixed with the heat insulation ring by the fan and the motor at a position corresponding to the fan connection seat, and a fan outlet of the fan is communicated with the air inlet chamber of the connection seat.

In another specific embodiment of the present invention, the left end of the feed cylinder is fixed to the right end face of the cylinder by a feed cylinder fixing screw.

In a further specific embodiment of the invention, the water cooling mechanism comprises a sleeve and a water jacket, the water jacket is arranged outside the sleeve, the space between the inner wall of the water jacket and the outer wall of the sleeve is formed into a water cooling cavity, a water inlet pipe connector and a water outlet pipe connector are formed on the water jacket, the water inlet pipe connector and the water outlet pipe connector are communicated with the water cooling cavity and are connected with a water circulation water supply device pipeline in a use state, the left end of the sleeve is fixed with the right end of the machine barrel through a sleeve left fixing screw, and the right end of the sleeve is fixed with the right end of the feeding barrel through a sleeve right fixing screw; the hopper communicated with the feeding cylinder cavity is fixed with the sleeve; a flat key is formed on the screw shaft head at the right end of the screw.

In a further embodiment of the invention, a feed pipe adapter is formed on the upward-facing side of the sleeve at a position corresponding to the hopper, a feed pipe is fixed to the feed pipe adapter, and the lower portion of the hopper is connected to the feed pipe flange, wherein a feed pipe cavity of the feed pipe communicates with a feed pipe adapter cavity of the feed pipe adapter, the feed pipe adapter cavity communicates with a feed cylinder inlet provided on the feed cylinder, and the feed cylinder inlet communicates with the feed cylinder cavity.

In a more specific embodiment of the present invention, the water receiving pipe joint and the water outlet pipe joint are in a diagonal position on the water jacket.

In a further specific embodiment of the present invention, a screw shaft seat connecting flange is fixed at the right end of the sleeve, a screw shaft head of the screw extends to the screw shaft seat, the screw shaft seat is fixed with the screw shaft seat connecting flange through a screw shaft seat fixing screw, and the screw shaft head is in transmission connection with the screw driving mechanism at the position of the screw shaft seat.

In a still more specific embodiment of the present invention, the screw driving mechanism includes a reduction gearbox driving wheel and a reduction gearbox, the reduction gearbox is fixed to the frame under use, a reduction gearbox power output shaft of the reduction gearbox extends to the screw shaft seat at a position corresponding to the screw shaft head, the screw shaft head is in transmission connection with the reduction gearbox power output shaft, the reduction gearbox driving wheel is fixed to a reduction gearbox power input shaft of the reduction gearbox, and the reduction gearbox driving wheel is in transmission connection with the driving motor through a transmission belt under use.

In yet another specific embodiment of the present invention, the diameter of the screw corresponding to the region of the vent is smaller than the diameter of the screw located in other regions of the barrel chamber

To

One of the technical effects of the technical scheme provided by the invention is that the diameter of the part of the screw corresponding to the air outlet area is smaller than the diameter of the screw at other parts in the cylinder cavity, so that the gap between the screw and the inner wall of the cylinder corresponding to the air outlet area is enlarged, gas formed after water in the plastic melt is evaporated can form an air cavity in the air outlet area and can be smoothly discharged from the air outlet through the exhaust pipe, and the quality and the strength of the plastic product can be guaranteed; because the water cooling mechanism is additionally arranged outside the feeding cylinder, the influence of the suddenly raised temperature of the cylinder on the materials in the area of the feeding cylinder and the mutual adhesion can be prevented, and the smooth feeding effect can be guaranteed.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

Fig. 2 is a sectional view of the cylinder and a middle portion in the length direction of the screw shown in fig. 1.

Fig. 3 is a sectional view a-a of fig. 1.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and back are taken as examples of the position state of fig. 1, and thus, the present invention should not be construed as being particularly limited to the technical solutions provided by the present invention.

Referring to fig. 1 to 3, there are shown a barrel 1 and a feed cylinder 2, the left end of the feed cylinder 2 is coupled (fixedly connected) with the right end of the barrel 1 and a feed cylinder cavity 21 of the feed cylinder 2 is communicated with a barrel cavity 11 of the barrel 1, while the left end of the barrel 1 is coupled with a barrel melt extrusion head 12, the barrel melt extrusion head 12 may also be called a barrel melt extrusion port and is supported by a supporting frame 121, and a vent 13 is opened on the barrel 1, and a vent pipe 131 communicated with the barrel cavity 11 is provided at a position corresponding to the vent 13; a screw 3 and a screw drive 4 are shown, the screw 3 being arranged in the machine chamber 11 and the left end of the screw 3 extending out of the machine chamber 11 to the machine melt extrusion head 12, while the right end of the screw 3 protrudes out of the right end of the feed cylinder chamber 21 and is formed with a screw head 31, the screw head 31 being in driving connection with the screw drive 4, and the screw drive 4 being arranged in use on the machine frame; a group of heating rings 5 is shown, the group of heating rings 5 are distributed at intervals in a state of corresponding to each temperature zone of the screw 3 and are arranged outside the machine barrel 1, an annular cavity 51 is respectively arranged (can be called as being formed) on the inner wall of the group of heating rings 5 and is positioned at (corresponding to) the middle part of the length direction of the heating rings 5 around the periphery of the inner wall of the heating rings 5, and ventilating grooves 511 are respectively arranged at intervals in a state of being parallel to the length direction of the heating rings 5 on two sides of the cavity wall of the annular cavity 51. If there are twelve ventilation slots 511 on one side of the wall of the annular chamber 51, there are twelve on the other side, and the ventilation slots 511 on one side correspond to the ventilation slots 511 on the other side. A heat insulation ring 52 is respectively arranged outside the group of heating rings 5, and the space between every two adjacent heating rings 5 is formed into an air outlet cavity 53, and the air outlet cavity 53 is communicated with the ventilating slot 511; a set of screw warm zone temperature regulation and control mechanisms 6 is shown, the number of the screw warm zone temperature regulation and control mechanisms 6 is equal to that of the heating rings 5, and the screw warm zone temperature regulation and control mechanisms are fixed with the heat insulation rings 52 and communicated with the annular cavity 51; a hopper 7 is shown, which hopper 7 is arranged in correspondence with the position of the aforementioned feeder 2.

Please continue to refer to fig. 1 to fig. 3, which are the technical points of the technical solutions provided by the present invention: in the structural system of the screw extrusion device with the air exhaust function, a water cooling mechanism 8 is further included, the water cooling mechanism 8 is arranged outside the feeding cylinder 2, and the hopper 7 is fixed with the water cooling mechanism 8 at a position corresponding to the feeding cylinder 2 and is communicated with the feeding cylinder cavity 21; the exhaust port 13 is opened in the middle portion of one side of the cylinder 1 facing upward in the longitudinal direction and corresponds to the air outlet chamber 53 between two adjacent heating rings located in the middle portion among the group of heating rings 5, the cylinder chamber 11 is configured as an exhaust port region 111 corresponding to a region between two adjacent heating rings located in the middle portion, and the diameter of the screw 3 corresponding to the exhaust port region 111 is smaller than the diameter of the screw 3 located in the other region in the cylinder chamber 11.

A fan matching seat 54 is respectively formed on the group of heating rings 5 and at the position corresponding to the group of screw temperature zone temperature adjusting and controlling mechanisms 6, the fan matching seat 54 is formed with a matching seat air inlet cavity 541, the matching seat air inlet cavity 541 is communicated with the annular cavity 51, and the group of screw temperature zone temperature adjusting and controlling mechanisms 6 are fixed with the heat insulation ring 52 at the position corresponding to the fan matching seat 54.

As a screw extruder, the region from the feed to the melt discharge, i.e., from the right end to the left end of the barrel 1, is usually set to different temperature zones according to the process requirements, and the temperatures of the temperature zones are different, and are thus adjusted and controlled by the aforementioned set of screw temperature zone temperature adjusting and controlling means 6. Although only one set of screw temperature zone temperature adjustment control mechanisms 6 is shown as four in the present embodiment, it is apparent that the number should not be limited thereto because the more temperature zones of the screw extrusion apparatus, the correspondingly increased number of screw temperature zone temperature adjustment control mechanisms 6 and vice versa.

The screw temperature zone temperature adjusting and controlling mechanisms 6 respectively comprise a motor 61 and a fan 62, the motor 61 is in transmission fit with the fan 62, the fan 62 and the motor 61 are fixed with the heat insulation ring 52 at a position corresponding to the fan adapting seat 54, and a fan outlet of the fan 62 is communicated with the adapting seat air inlet cavity 541. When the motor 61 works, the fan 62 is driven by the motor, air with the external environment temperature is introduced into the matching seat air inlet cavity 541 of the fan matching seat 54 through the fan air outlet of the fan 62, the air is introduced into the annular cavity 51 through the matching seat air inlet cavity 541 and is led out from the air outlet cavity 53 through the air duct 511, and the temperature of the temperature zone corresponding to the part of the machine barrel 1 is controlled by the air volume of the fan 62.

The left end of the feed cylinder 2 is fixed to the right end surface of the cylinder 1 by a feed cylinder fixing screw 22.

As shown in fig. 1, the water cooling mechanism 8 includes a sleeve 81 and a water jacket 82, the water jacket 82 is disposed outside the sleeve 81, a space between an inner wall of the water jacket 82 and an outer wall of the sleeve 81 is configured as a water cooling chamber 83, and a water inlet pipe joint 821 and a water outlet pipe joint 822 are formed on the water jacket 82, the water inlet pipe joint 821 and the water outlet pipe joint 822 are communicated with the water cooling chamber 83 and are connected with a water circulation water supply device such as a circulation pump pipe in a use state, a left end of the sleeve 81 is fixed to a right end of the cylinder 1 by a sleeve left fixing screw 811, and a right end of the sleeve 81 is fixed to a right end of the feed cylinder 2 by a sleeve right fixing screw 812; the hopper 7 communicated with the feeding cylinder cavity 21 is fixed with a sleeve 81; a flat key 311 is formed on the screw head 31 at the right end of the screw 3.

As shown in fig. 1, a feed pipe fitting 813 is formed on the upward side of the sleeve 81 at a position corresponding to the hopper 7, a feed pipe 8131 is fixed to the feed pipe fitting 813, and the lower portion of the hopper 7 is flanged to the feed pipe 8131, wherein a feed pipe cavity 81311 of the feed pipe 8131 communicates with a feed pipe fitting cavity 8132 of the feed pipe fitting 813, the feed pipe fitting cavity 8132 communicates with a feed cylinder inlet port 23 opened in the feed cylinder 21, and the feed cylinder inlet port 23 communicates with the feed cylinder cavity 21.

Preferably, the water receiving pipe joint 821 and the water outlet pipe joint 822 are diagonally arranged on the water jacket 82.

Continuing to refer to fig. 1, a screw shaft seat connecting flange 814 is fixed at the right end of the sleeve 81, the screw shaft head 31 of the screw 3 extends to the screw shaft seat 312, the screw shaft seat 312 is fixed with the screw shaft seat connecting flange 814 by a screw shaft seat fixing screw 3121, and the screw shaft head 31 is in transmission connection with the screw driving mechanism 4 at the position of the screw shaft seat 312.

Continuing to refer to fig. 1, the screw driving mechanism 4 includes a reduction box driving wheel 41 and a reduction box 42, the reduction box 42 is fixed with the frame under use, a reduction box power output shaft 421 of the reduction box 42 extends to the screw shaft seat 312 at a position corresponding to the screw shaft head 31, the screw shaft head 31 is in transmission connection with the reduction box power output shaft 421, the reduction box driving wheel 41 is fixed with a reduction box power input shaft 422 of the reduction box 42, and the reduction box driving wheel 41 is in transmission connection with the driving motor through a transmission belt under use.

In this embodiment, the diameter of the screw 3 corresponding to the exhaust port region 111 is smaller than the diameter of the screw 3 located in the other part of the barrel chamber 11

But may also be

The plastic particles are introduced from the hopper 7 and enter the feeding cylinder cavity 21 through the feeding pipe cavity 81311 of the feeding pipe 8131 and the feeding cylinder feeding port 23 in sequence, meanwhile, a driving motor of a structural system of the screw driving mechanism 4 which is not shown in fig. 1 drives a driving motor main wheel, a driving wheel of the driving motor drives the reduction gearbox driving wheel 41 through a transmission belt such as a belt, the reduction gearbox driving wheel 41 drives the reduction gearbox power input shaft 422, the reduction gearbox 42 decelerates, the reduction gearbox power output shaft 421 of the reduction gearbox 42 drives the screw spindle head 31, so that the screw 3 rotates, and at the moment, the plastic particles entering the feeding cylinder cavity 21 are extruded from the right to the left under the movement of the screw 3 and from the cylinder melt extrusion head 12 under the state of forming a melt. In the foregoing process, the water cooling mechanism 8 is in a working state, water is introduced into the water cooling cavity 83 through the water inlet pipe connector 821, the sleeve 81 is cooled through the water cooling cavity 83, and then the feeding barrel 21 is cooled through the sleeve 81, so that the temperature of the feeding barrel cavity 21 is reduced, the phenomenon that the material in the feeding barrel cavity 21 is entangled (bonded) due to the suddenly increased temperature in the barrel 1 at the position adjacent to the barrel 1 is avoided, the material in the feeding barrel cavity 21 is smoothly introduced into the barrel cavity 11, and the water entering the water cooling cavity 83 is introduced through the water outlet pipe connector 822, so that circulation is formed. At the same time, the temperature regulating and controlling means 6 of the aforesaid set of zones of the screw are all in working condition, and the temperature of each zone of the extrusion apparatus is controlled according to the above description of the applicant. The method comprises the following steps: since the set of screw temperature zone temperature adjusting and controlling mechanisms 6 is controlled by a Programmable Logic Controller (PLC) of the electric box, the PLC controls the rotation speed of the motor 61 of each screw temperature zone temperature adjusting and controlling mechanism 6 in the set of screw temperature zone temperature adjusting and controlling mechanisms 6 to change the rotation speed of the fan 62, so that the air supply amount of the fan 62 is changed, and finally the temperatures of different temperature zones corresponding to the machine barrel 1 are controlled.

As described above, since the diameter of the screw 3 corresponding to the location or section of the vent region 111 is smaller (smaller) than the diameter of the other locations, the cavity volume of the barrel chamber 11 in the vent region 111 is larger than the other locations, and the gas generated by the steam in the molten plastic melt is discharged from the vent 13 through the vent pipe 131, thereby improving the quality and strength of the preform surface and ultimately the quality and strength of the plastic product. As can be seen from the schematic representations of fig. 1 and 2: the length of the aforementioned exhaust port region 111 is substantially the distance between two adjacent heating coils 5 located in the middle of a group of heating coils, and the exhaust port 13 corresponds to the longitudinally central position of the exhaust port region 111.

Furthermore, as can be seen from the above description in conjunction with fig. 1: the whole screw 3 is respectively called as a feeding section, a conveying heating section, an exhaust releasing section and a compressing section from right to left, the feeding section corresponds to the feeding cylinder cavity 21, the conveying heating section is positioned between the right of the exhaust releasing section and the feeding section, the exhaust releasing section is the part of the screw 3 corresponding to the exhaust port area 111, gas generated after water evaporation is generally concentrated in the area and is released (i.e. exhausted) from the area, and the compressing section is the area between the left corresponding to the exhaust releasing section and the cylinder melt extrusion head 12. It is also shown in fig. 1 that the thread on the screw body in the region of the screw 3 corresponding to the compression section is a double-flight thread.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.