CN103522503B - An injection mold for a dislocation helical hollow propulsion tube - Google Patents

Abstract

The invention discloses an injection mold of a staggered spiral line type hollow propelling pipe, which comprises a mold bottom plate, a pressing plate, two half-closed movable mold plates, a two half-closed fixed mold plates, a pouring system, a cooling system and a core pulling structure, wherein insert components are respectively arranged in the movable mold plates and the fixed mold plates, a half-spiral structure is processed on a cavity surface formed by the insert components, the two half-spiral structures are arranged in a staggered and closed mode, a cylindrical core with an axial groove is arranged at one side of the middle of the cavity surface in an inserted mode, the core pulling structure is connected with a hydraulic cylinder, sliding block structures are fixed at two sides of the mold, and oil cylinder fixing blocks for the hydraulic cylinder. The invention adopts the two half-sections of the cavity to be closed, the half-spiral structure is staggered and closed, a transition plane is formed at the junction of the spiral surfaces, the rate of finished products of the mold stripping is greatly improved, the product performance is excellent, the long cylindrical mold core provides power by connecting a core pulling mechanism of a hydraulic cylinder, and the hydraulic cylinder performs limiting sliding, the guiding precision is high, and the two-cavity structure of the invention has high productivity.

Description

An injection mold for a dislocation helical hollow propulsion tube

technical field

The invention belongs to the technical field of molds for processing spiral products, and in particular relates to an injection mold for a dislocation helical hollow propulsion tube.

Background technique

At present, the spiral propulsion tube is widely used in industry, mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, especially in water supply, drainage, sewage treatment engineering, mud transportation, material particle transfer, marine piling tube and other fields. It is mainly to use its structural characteristics to realize spiral propulsion or export, and push the material from the collecting hopper to the next equipment. Commonly used steel structure welding parts and plastic injection molding parts. For example, the patent application number: 201320001560.X discloses a substrate removal device, which includes a slope collection mechanism and a screw transmission mechanism, wherein the screw transmission mechanism includes a sleeve, and a rotating shaft with a helical piece is arranged in the sleeve. The rotating shaft is driven by a motor with a reduction gear. Here, the rotating shaft with helical blades is selected, which is a structure that realizes the screw propulsion and the substrate is dirty. During the use of the steel structure spiral propulsion tube, it cannot cope with the equipment loss of corrosive substances, and the service life is short and the cost is high. It is not economical and applicable. Plastic injection molded parts are used, which have a long service life and reliable performance. However, because its helical structure is a part with helical curved blades in the whole circle, the structure of the part is relatively complicated, and it is not easy to demould during mold production; conventional molds In the production of injection molding, the structure is very complicated, the production cost is high, and the dimensional accuracy is difficult to control, which affects the mechanical strength of the product and easily causes product quality defects.

The Chinese patent application number: 201210281294.0 discloses an injection mold for making a spiral fan. The injection mold includes a movable mold seat plate, a square iron, a supporting plate, a movable template, a fixed template, a front inner mold, a spiral core, Split type oblique bearing, slide block, scraper, oblique guide column, nozzle push plate, fixed mold seat plate, positioning ring, bottom needle plate, face needle plate, cylinder and cylinder needle. The structure of the above-mentioned invention adopts a slider and a spiral core structure. The spiral core relies on the rotation of the split-type oblique bearing to achieve the ejection of the plastic product by the cylinder to solve the demoulding problem, but each spiral piece needs an independent split-type oblique bearing. The structure of the bearing is still relatively complicated, and the demoulding process is also relatively cumbersome.

Contents of the invention

The present invention aims to solve the above-mentioned technical problems, and provides an injection mold for a dislocation helical hollow propulsion tube with reasonable structure, convenient use, reliable performance and convenient demoulding.

In order to achieve the above object, the technical solution adopted by the present invention is: an injection mold for a misplaced helical type hollow propulsion tube, including a mold bottom plate, a pressure plate, a moving template with two halves combined, a fixed template, a pouring system, a cooling system and a pumping system. The core structure, the movable template and the fixed template are respectively provided with insert components, the surface of the cavity formed by the insert components is processed with a half-helical structure, the two half-helical structures are staggered and combined, and the cavity A core with a circular cross section is inserted in the middle of the surface, an axial groove is set on one side of the core, the core pulling mechanism is connected to the hydraulic cylinder, the slider structure is fixed on both sides of the mold, and the hydraulic cylinder uses a cylinder fixing block Set on the slider structure.

The slider structure is limited to slide in the chute formed by the slider bracket and the bead, the slider structure is fixed on both sides of the mold through the slider bracket fixing block, and the slider pressing block is arranged at the end of the chute. The slider structure is provided with a squeeze block to ensure guiding accuracy.

The inner grooves of the movable template and the fixed template are respectively provided with insert positioning mechanisms.

The insert positioning mechanism includes adjustable pressing members arranged on adjacent two sides of the inner groove, and reference planes are arranged on opposite sides of the adjustable pressing member.

The core is combined by two parts, including an upper long core and a lower short core.

The gating system includes a sprue, a runner, a gate and a cold cavity.

The gate is a circular hole arranged on the fixed formwork insert component, and the number of the gates is eight evenly distributed.

The movable template and the fixed template are provided with guide pillar guide sleeve structures.

Auxiliary guide blocks are respectively arranged on the vertical sides of the parting surface of the cavity surface.

A pusher space is formed between the mold bottom plate and the fixed template by setting a supporting member, a pusher rod group is arranged in the pusher space, a pusher fixing plate is arranged at the rear of the pusher rod group, and a pusher fixing plate is arranged at the bottom of the pusher fixing plate. Lining push piece board.

A pulling rod and a reset rod are arranged at the main channel, and the number of the reset rods is at least two.

The cooling system is a cooling water channel integrally processed on the movable template, the fixed template and the cavity insert respectively.

The movable template and the fixed template are set as a structure with one mold and two cavities.

The injection mold of the misplaced helical type hollow propulsion tube of the present invention, in order to produce and prepare the spiral propulsion tube product with complex structure and difficult processing, insert components are respectively arranged in the moving template and the fixed template of the two halves, from From the perspective of production, material saving and process simplification can simplify the structural surface, reduce the difficulty of processing and installation, and the insert member can be replaced as needed, which is suitable for the production and preparation of different sizes and series products. The insert member formed The two halves of the cavity are closed, and a semi-helical structure is processed on the surface of the cavity. The two half-helical structures are staggered and combined to form the outer surface of the spiral propulsion tube. Here, the creative design of the staggered fit is used to make the The mold becomes simple, and the structure formed by inversion makes the prepared spiral propulsion tube form a transition plane at the junction of the helical surfaces, which can greatly improve the yield of the mold during the mold ejection process, and the obtained product has superior performance, and the propulsion object more efficient.

Since the spiral propulsion tube is a hollow structure, the core is inserted in the middle of the cavity to form the inner hole of the spiral propulsion tube, and an axial groove is arranged on one side of the core to form a key of the inner hole, It is convenient to cooperate with the use. The core pulling mechanism is connected with the hydraulic cylinder to provide power for the core action. The hydraulic cylinder uses a cylinder fixing block to be arranged on the slider structure, and the slider structure is fixed on the slider through the slider holder fixing block. On both sides of the mold, in order to ensure the accuracy of the movement of the core and product quality, the slider structure is limited to slide in the chute formed by the slider bracket and the bead, and the slider pressing block is set at the end of the chute for The path is limited, and the slider structure is provided with a squeeze block to ensure the guiding accuracy.

Further, the inner grooves of the movable template and the fixed template are respectively provided with an insert positioning mechanism, specifically, the insert positioning mechanism includes adjustable pressing members arranged on adjacent two sides of the inner groove, and the adjustable A reference plane is set on the opposite sides of the compression member. When installing the insert structure, the reference plane is used as the installation starting point, and each insert unit of the insert structure is installed one by one, and then the adjustable pressure The tight member realizes positioning and clamping, ensures the precise installation of the insert structure, and avoids the problem that the insert unit cannot be installed smoothly due to machining accuracy and accumulated errors during installation, or at least the last piece is difficult to install and needs to be knocked by external force, because the mold After such operation, the precision and normal use of the mold will inevitably be affected. What’s more inconvenient is that it is almost impossible to replace the knocked-in insert unit interchangeably, and at least one insert unit must be destroyed. Yes, but the present invention is provided with the insert positioning mechanism, which can solve the above problems well, and the installation is precise. When disassembling, it is only necessary to loosen the adjustable pressing member to conveniently operate the insert unit. , will not affect and interfere with each other, reduce the cost of mold preparation and maintenance, and improve the production of a set of moving and fixed molds to adapt to a variety of similar structures, only need to replace the insert unit.

Further, since the mold is often used on a horizontal injection molding machine, the two halves of the mold core are opened when the mold is opened horizontally, and the core is joined by two parts, which respectively pass through the axial center of the screw propulsion tube , the core-pulling structure is core-pulling in the direction perpendicular to the ground, the lower space of the injection molding machine is limited, the lower short core is set, and the upper space is ample, so the upper long core is set.

The pouring system includes a sprue, a runner, a gate and a cold cavity. When the mold is closed, the liquid thermoplastic is injected from the sprue and enters the cavity through the runner and the gate to realize the product Filling and molding, use the cold material cavity to store the cold material head generated by the interval between two injections and the frontal cold material of the melt flow to prevent the melt cold material from entering the cavity. The gate is set on the movable template, The circular orifice on the fixed formwork insert component, the number of the gates is eight evenly distributed, and multiple points are filled at the same time to ensure that the injection molding process is fast and fast, and the product is uniform in texture and stable in performance.

The movable platen and the fixed platen are provided with a guide post and guide sleeve structure for the movable and fixed mold to ensure the positional accuracy of the mold opening and closing. Two auxiliary guide blocks are respectively arranged on the vertical sides of the parting surface of the cavity surface, which is more suitable for the mold The characteristics of heavy weight and large shape can improve the quality of opening and closing molds, and the combined use is beneficial to product quality control and prolonging the service life of molds.

A supporting piece is arranged between the mold bottom plate and the fixed template to form a pusher space, so that the movement of the pusher rod group is not hindered. A pusher rod group is arranged in the pusher space, and the rear part of the pusher rod group is arranged The push rod fixing plate, the bottom of the push rod fixing plate is lined with the push piece plate, when the product can be completely pulled out, it is convenient for the ejector mechanism of the injection molding machine to reach the push piece plate through the ejection hole of the mold bottom plate, and the push rod is pushed out. Eject the workpiece.

A pulling rod and a reset rod are arranged under the sprue, and the number of the reset rods is at least two. When the mold is opened, the sprue condensate is pulled out from the sprue sleeve under the action of the pulling rod, and then The push-out mechanism pushes the plastic parts and aggregate out of the mold together, which is convenient for mold-out processing.

The cooling system is a cooling water channel integrally processed on the movable template, the fixed template and the cavity insert. The water supply circulates in the water channel to control the overall temperature of the mold, so that the overall mold is at a stable working temperature, which is convenient for cooling and molding, and improves production efficiency. ; The cooling water channel includes two groups uniformly distributed outside the cavity, which can improve the cooling efficiency and ensure the molding quality.

The movable platen and the fixed platen are set as a mold with two cavities, and the corresponding core-pulling structure is designed as two groups, and the production and preparation of two products can be completed in one operation, so that the work efficiency can be further improved by nearly double.

The working process of the mold of the present invention is as follows:

1. First, when the mold is closed, the liquid thermoplastic is injected from the main channel, enters the mold cavity through the runner and the gate, maintains pressure, cools, and the plastic spiral tube is formed;

2. Then, the hydraulic cylinders on both sides of the mold act to drive the slider mechanism to pull out the core with a circular cross-section in the mold cavity;

3. Next, the injection molding motorized template and the fixed template are opened, and the movable and fixed mold parts of the mold are separated, and the outer surface of the screw propulsion tube can be opened;

4. At this time, the product can be completely ejected, and the ejector mechanism of the injection molding machine reaches the ejector plate through the ejection hole of the mold bottom plate, and the push rod on the ejector plate performs a push-out action to eject the product;

5. Finally, after the product is taken out, the injection molding motorized mold plate is partially closed with the movable mold of the mold, and the reset lever allows the push piece lever group to return, and the hydraulic cylinders on both sides of the mold move to drive the slider mechanism to insert the core again, and the mold is completely closed , in the mold clamping state, ready for the next injection.

In the present invention, the two halves of the mold cavity are combined, and a semi-helical structure is processed on the surface of the mold cavity. The two half-helix structures are creatively displaced and combined to form the outer surface of the helical propulsion tube, which makes the mold removal simple and convenient. The structure formed by the combination makes the prepared product form a transition plane at the junction of the helical surfaces, which greatly improves the yield of the mold, and the performance of the obtained product is superior, and the efficiency of pushing the object is higher. For the movement of the core, power is provided by connecting the core pulling mechanism to a hydraulic cylinder, and the hydraulic cylinder uses a cylinder fixing block to be arranged on the slider structure, and the slider structure is formed by the slider support and the bead It constitutes a limit slide in the chute, the end of the chute is provided with a slider block for path limitation, and the structure of the slider is provided with a squeeze block to ensure the guiding accuracy, so as to ensure the accurate movement of the core and product quality. The movable template and the fixed template are set as a mold with two cavities, and the production and preparation of two products can be completed in one operation, so that the work efficiency can be further improved by nearly double, and the design of the injection port is reasonable, and the product has superior performance. The invention has the advantages of simple structure, convenient manufacture and installation, high production efficiency and strong popularization and use value.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is a kind of structural representation of the present invention;

Fig. 2 is a kind of partial semi-sectional structure schematic diagram of the present invention;

Fig. 3 is a kind of structural representation of cooling system of the present invention;

Fig. 4 is a schematic structural view of an insert positioning mechanism in Embodiment 4 of the present invention;

Fig. 5 is another structural schematic diagram of the insert positioning mechanism in the fourth embodiment of the present invention;

Fig. 6 is a sample diagram of the product of the present invention.

detailed description

Specific embodiment one

As shown in Fig. 1, Fig. 2 and Fig. 3, an injection mold for a dislocation helical hollow propulsion tube includes a mold bottom plate 1, a pressure plate 2, a moving template 3 with two halves combined, a fixed template 4, a pouring system 5, Cooling system 6 and core-pulling mechanism 9, the movable template 3 and the fixed template 4 are respectively provided with insert components 7, and the cavity surface formed by the insert components 7 is processed with a half helical structure 8, and the two half The helical structure 8 is misplaced and combined, and a core 10 with a circular cross-section is inserted in the middle of the cavity surface. An axial groove is arranged on one side of the core 10. The core pulling mechanism 9 is connected to a hydraulic cylinder 11. Both sides of the mold The slider structure 12 is fixed on the side, and the hydraulic cylinder 11 is arranged on the slider structure 12 through the oil cylinder fixing block.

The slider structure 12 is limited to slide in the chute formed by the slider bracket and the bead, the slider structure 12 is fixed on both sides of the mold by the slider bracket fixing block, and the slider pressure is set at the end of the chute. block, and the slider structure 12 is provided with a squeeze block to ensure guiding accuracy.

The core 10 is combined by two parts, including an upper long core and a lower short core.

The gating system 5 includes a sprue, a runner, a gate and a cold cavity.

The gate is a circular hole arranged on the insert member 7 of the fixed formwork 4, and the number of the gates is eight evenly distributed.

The movable formwork 3 and the fixed formwork 4 are provided with guide pillar guide sleeve structures 13 .

Auxiliary guide blocks 14 are respectively arranged on the vertical sides of the parting surface of the cavity surface.

A pusher space is formed between the mold bottom plate 1 and the fixed template 4 by setting a support member 15, a pusher rod group 16 is arranged in the pusher space, and a pusher fixing plate 17 is arranged at the rear of the pusher rod group 16, so that The bottom of the push rod fixing plate 17 is lined with a push piece plate 18.

A pulling rod and a reset rod are arranged at the main channel, and the number of the reset rods is at least two.

The cooling system 6 is a cooling channel integrally processed on the movable template 3, the fixed template 4 and the cavity insert respectively.

The movable template 3 and the fixed template 4 are configured as a mold with two cavities.

Specific embodiment two

The difference from Embodiment 1 is that: the cooling water channels include two groups uniformly distributed outside the cavity.

Specific embodiment three

The difference from the first embodiment is that the number of gates is four evenly distributed.

Specific embodiment four

The difference from Embodiment 1 or 2 or 3 is that: the inner grooves 19 of the movable template 3 and the fixed template 4 are respectively provided with insert positioning mechanisms, and the insert positioning mechanisms include adjacent two sides of the inner groove 19 An adjustable pressing member 20 is provided, and reference planes are set on opposite sides of the adjustable pressing member 20 .

As shown in FIG. 4 , the adjustable pressing member 20 is configured as a briquetting structure connected with a lead screw nut pair of the plate body (that is, the body of the movable template 3 or the fixed template 4 ).

Specific embodiment five

The difference from Embodiment 4 is that, as shown in FIG. 5 , the adjustable pressing member 20 is pierced through a pressing block structure connected by double-screw nuts on the plate body.

Further, the adjustable pressing member 20 is a press block structure driven by hydraulic pressure or cylinder.

In the above-mentioned embodiment, the injection mold of the dislocated helical-line hollow propulsion tube according to the present invention, in order to produce the helical propulsion tube product with complex structure and difficult processing, is respectively set in the movable template and the fixed template of the two halves The insert component can save materials and simplify the process from the production point of view, simplify the structural surface, reduce the difficulty of processing and installation, and the insert component can be replaced as needed, and is suitable for the production and preparation of different sizes and series products. The two halves of the mold cavity formed by the insert member are closed, and a semi-helical structure is processed on the cavity surface. The two half-helix structures are staggered and combined to form the outer surface of the helical propulsion tube, as shown in Figure 6. As shown in the figure, the creative design of dislocation and inversion is adopted here, which makes the mold ejection easier. The structure formed by the inversion makes the prepared spiral propulsion tube form a transition plane at the junction of the helical surfaces, which can greatly improve the mold ejection process. The yield of the mold is improved, and the performance of the manufactured product is superior, and the efficiency of pushing the object is higher.

Since the spiral propulsion tube is a hollow structure, the core is inserted in the middle of the cavity to form the inner hole of the spiral propulsion tube, and an axial groove is arranged on one side of the core to form a key of the inner hole, It is convenient to cooperate with the use. The core pulling mechanism is connected with the hydraulic cylinder to provide power for the core action. The hydraulic cylinder uses a cylinder fixing block to be arranged on the slider structure, and the slider structure is fixed on the slider through the slider holder fixing block. On both sides of the mold, in order to ensure the accuracy of the movement of the core and product quality, the slider structure is limited to slide in the chute formed by the slider bracket and the bead, and the slider pressing block is set at the end of the chute for The path is limited, and the slider structure is provided with a squeeze block to ensure the guiding accuracy.

Further, the inner grooves of the movable template and the fixed template are respectively provided with an insert positioning mechanism, specifically, the insert positioning mechanism includes adjustable pressing members arranged on adjacent two sides of the inner groove, and the adjustable A reference plane is set on the opposite sides of the compression member. When installing the insert structure, the reference plane is used as the installation starting point, and each insert unit of the insert structure is installed one by one, and then the adjustable pressure The tight member realizes positioning and clamping, ensures the precise installation of the insert structure, and avoids the problem that the insert unit cannot be installed smoothly due to machining accuracy and accumulated errors during installation, or at least the last piece is difficult to install and needs to be knocked by external force, because the mold After such operation, the precision and normal use of the mold will inevitably be affected. What’s more inconvenient is that it is almost impossible to replace the knocked-in insert unit interchangeably, and at least one insert unit must be destroyed. Yes, but the present invention is provided with the insert positioning mechanism, which can solve the above problems well, and the installation is precise. When disassembling, it is only necessary to loosen the adjustable pressing member to conveniently operate the insert unit. , will not affect and interfere with each other, reduce the cost of mold preparation and maintenance, and improve the production of a set of moving and fixed molds to adapt to a variety of similar structures, only need to replace the insert unit.

Further, since the mold is often used on a horizontal injection molding machine, the two halves of the mold core are opened when the mold is opened horizontally, and the core is joined by two parts, which respectively pass through the axial center of the screw propulsion tube , the core-pulling structure is core-pulling in the direction perpendicular to the ground, the lower space of the injection molding machine is limited, the lower short core is set, and the upper space is ample, so the upper long core is set.

The pouring system includes a sprue, a runner, a gate and a cold cavity. When the mold is closed, the liquid thermoplastic is injected from the sprue and enters the cavity through the runner and the gate to realize the product Filling and molding, use the cold material cavity to store the cold material head generated by the interval between two injections and the frontal cold material of the melt flow to prevent the melt cold material from entering the cavity. The gate is set on the movable template, The circular orifice on the fixed formwork insert component, the number of the gates is eight evenly distributed, and multiple points are filled at the same time to ensure that the injection molding process is fast and fast, and the product is uniform in texture and stable in performance.

The movable platen and the fixed platen are provided with a guide post and guide sleeve structure for the movable and fixed mold to ensure the positional accuracy of the mold opening and closing. Two auxiliary guide blocks are respectively arranged on the vertical sides of the parting surface of the cavity surface, which is more suitable for the mold The characteristics of heavy weight and large shape can improve the quality of opening and closing molds, and the combined use is beneficial to product quality control and prolonging the service life of molds.

A supporting piece is arranged between the mold bottom plate and the fixed template to form a pusher space, so that the movement of the pusher rod group is not hindered. A pusher rod group is arranged in the pusher space, and the rear part of the pusher rod group is arranged The push rod fixing plate, the bottom of the push rod fixing plate is lined with the push piece plate, when the product can be completely pulled out, it is convenient for the ejector mechanism of the injection molding machine to reach the push piece plate through the ejection hole of the mold bottom plate, and the push rod is pushed out. Eject the workpiece.

A pulling rod and a reset rod are arranged under the sprue, and the number of the reset rods is at least two. When the mold is opened, the sprue condensate is pulled out from the sprue sleeve under the action of the pulling rod, and then The push-out mechanism pushes the plastic parts and aggregate out of the mold together, which is convenient for mold-out processing.

The cooling system is a cooling water channel integrally processed on the movable template, the fixed template and the cavity insert. The water supply circulates in the water channel to control the overall temperature of the mold, so that the overall mold is at a stable working temperature, which is convenient for cooling and molding, and improves production efficiency. ; The cooling water channel includes two groups uniformly distributed outside the cavity, which can improve the cooling efficiency and ensure the molding quality.

The movable platen and the fixed platen are set as a mold with two cavities, and the corresponding core-pulling structure is designed as two groups, and the production and preparation of two products can be completed in one operation, so that the work efficiency can be further improved by nearly double.

The working process of the mold of the present invention is as follows:

1. First, when the mold is closed, the liquid thermoplastic is injected from the main channel, enters the mold cavity through the runner and the gate, maintains pressure, cools, and the plastic spiral tube is formed;

2. Then, the hydraulic cylinders on both sides of the mold act to drive the slider mechanism to pull out the core with a circular cross-section in the mold cavity;

3. Next, the injection molding motorized template and the fixed template are opened, and the movable and fixed mold parts of the mold are separated, and the outer surface of the screw propulsion tube can be opened;

4. At this time, the product can be completely ejected, and the ejector mechanism of the injection molding machine reaches the ejector plate through the ejection hole of the mold bottom plate, and the push rod on the ejector plate performs a push-out action to eject the product;

5. Finally, after the product is taken out, the injection molding motorized mold plate is partially closed with the movable mold of the mold, and the reset lever allows the push piece lever group to return, and the hydraulic cylinders on both sides of the mold move to drive the slider mechanism to insert the core again, and the mold is completely closed , in the mold clamping state, ready for the next injection.

In the present invention, the two halves of the mold cavity are combined, and a semi-helical structure is processed on the surface of the mold cavity. The two half-helix structures are creatively displaced and combined to form the outer surface of the helical propulsion tube, which makes the mold removal simple and convenient. The structure formed by the combination makes the prepared product form a transition plane at the junction of the helical surfaces, which greatly improves the yield of the mold, and the performance of the obtained product is superior, and the efficiency of pushing the object is higher. For the movement of the core, power is provided by connecting the core pulling mechanism to a hydraulic cylinder, and the hydraulic cylinder uses a cylinder fixing block to be arranged on the slider structure, and the slider structure is formed by the slider support and the bead It constitutes a limit slide in the chute, the end of the chute is provided with a slider block for path limitation, and the structure of the slider is provided with a squeeze block to ensure the guiding accuracy, so as to ensure the accurate movement of the core and product quality. The movable template and the fixed template are set as a mold with two cavities, and the production and preparation of two products can be completed in one operation, so that the work efficiency can be further improved by nearly double, and the design of the injection port is reasonable, and the product has superior performance. The invention has the advantages of simple structure, convenient manufacture and installation, high production efficiency and strong popularization and use value.

Claims (9)

1. An injection mold for a misplaced helical type hollow propulsion tube, comprising a mold base plate, a pressing plate, two halves of the moving and fixed templates, a pouring system and a cooling system, characterized in that: it also includes a core-pulling structure, and the moving 1. Insert components are respectively arranged in the fixed template, and the cavity surface formed by the insert components is processed with a half-helix structure, and the two half-helix structures are staggered and combined, and the insertion section in the middle of the cavity surface is circular The core is provided with an axial groove on one side of the core, the core pulling mechanism is connected to the hydraulic cylinder, the slider structure is fixed on both sides of the mold, and the oil cylinder fixing block for the hydraulic cylinder is arranged on the slider structure. 2. The injection mold of the misplaced helical type hollow propulsion tube as claimed in claim 1, characterized in that: the slider structure slides in a limited position in the chute formed by the slider bracket and the bead, and the slider structure passes through The slider holder fixing blocks are fixed on both sides of the mould, and the slider pressing blocks are arranged at the ends of the chute. 3 . The injection mold for the offset helical hollow propulsion tube according to claim 1 , wherein the inner grooves of the movable platen and the fixed platen are respectively provided with insert positioning mechanisms. 4 . 4. The injection mold of the dislocation helical hollow propulsion tube according to claim 3, characterized in that: the insert positioning mechanism includes adjustable pressing members provided on the adjacent two sides of the inner groove, and the adjustable Set datum planes on opposite sides of the compression member. 5 . The injection mold for the offset helical hollow propulsion tube according to claim 1 , wherein the core is joined by two parts, including an upper long core and a lower short core. 6. The injection mold of the dislocation helical type hollow propulsion tube as claimed in claim 1, characterized in that: the movable and fixed templates are provided with a guide post and guide sleeve structure, and the vertical sides of the parting surface of the cavity surface are respectively provided with Auxiliary guide blocks. 7. The injection mold of the misplaced helical type hollow propulsion tube according to claim 1, characterized in that: a push piece space is formed between the mold bottom plate and the fixed plate by setting a support piece, and a push piece rod is arranged in the push piece space A push rod fixing plate is arranged at the rear of the push rod set, and a push rod plate is lined at the bottom of the push rod fixing plate. 8. The injection mold of the offset helical hollow propulsion tube according to claim 1, characterized in that: the cooling system is a cooling water channel integrally processed on the movable and fixed templates and cavity inserts respectively. 9. The injection mold for the offset helical hollow propulsion tube according to any one of claims 1-8, characterized in that: the movable and fixed templates are configured as a mold with two cavities.