Injection molding machine for preforms

Abstract

The present invention relates to an injection molding machine for preforms. The efficiency of existing injection molding machines for preforms is low, which affects the user experience. The present invention includes a frame and a conveying mechanism, the conveying mechanism can drive the preform to move from the injection molding station to the preform stripping station, the injection molding station is provided with an injection molding cavity, the conveying mechanism includes a core body and a half clamp, the core body is vertically inserted into the injection molding cavity and is enclosed with the half clamp to form a closed chamber, when the produced preforms rise, it is only necessary to raise the height of the injection molding cavity, so that space can be reserved for the movable table to move the core body, the half clamp and the preform horizontally, and the half clamp drives the preform to separate from the core body when moving to the stripping station, the core body and the half clamp move synchronously and cool and shape the preform before moving to the stripping station for stripping. The core body and the half clamp can move synchronously, which can not only save the distance of the core body being pulled upward away from the preform at the injection molding station, improve the processing efficiency, but also reduce the height of the injection molding machine for preforms, and can use the core body to continuously cool and shape the preform, reduce the number of waste products, and increase production.

Description

Technical Field

[0001] The invention relates to the field of injection molding, in particular to an injection molding machine for preforms of bottles. Background Art

[0002] The existing preform injection molding machine has a preform injection molding function, and can process granular raw materials into preforms that are easy to transport, which is convenient for transportation and saves freight. Compared with bottle body transportation, preform transportation has the advantage of low freight. The existing preform injection molding machine includes a frame and an injection molding mechanism, a preform connection mechanism and a transportation mechanism arranged on the frame. The injection molding mechanism forms an injection molding station for injection molding the preform, the preform connection mechanism forms a preform stripping station for receiving the preform, and the transportation mechanism transports the preform formed at the injection molding station to the preform stripping station and is received by the preform connection mechanism.

[0003] Specifically, the injection molding mechanism is horizontally arranged, and includes an injection molding cavity and a core body that can be inserted into the injection molding cavity. The transportation mechanism includes a half clamp that can clamp the bottle blank at the cavity opening of the injection molding cavity. During injection molding, the core body is horizontally inserted into the injection molding cavity and encloses a closed chamber. The injection molding mechanism forms the bottle blank by injecting liquefied raw materials into the closed chamber. After the injection molding is completed, the bottle blank is separated from the injection molding cavity along with the core body, so that the bottle blank is completely separated from the injection molding cavity, and a blank removal space for the half clamp to move into is formed between the injection molding cavity and the bottle blank. After the half clamp moves to the blank removal space, it clamps the bottle blank so that the bottle blank is separated from the core body. After the bottle blank is completely separated from the core body, it is taken away from the blank removal space by the half clamp; the external transfer mechanism is placed on the bottle blank through a cooling barrel, so that the bottle blank is cooled and shaped when it is moved away from the blank removal space by the transfer mechanism. In this structure, the core body is separated from the injection cavity by horizontal movement to form a demolding space. The long moving distance of the core body will increase the time required for a single injection of the injection molding mechanism, resulting in low production efficiency and increased processing costs. The core body requires a larger opening and closing space, which will increase the size of the frame. In turn, a larger installation space needs to be reserved for the injection molding machine, increasing the cost of raw materials required for equipment production. The preforms will also collide and deform when they are separated from the core body due to insufficient cooling before being transported to the demolding station, resulting in an increase in the number of scraps. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides an injection molding machine for bottle blanks, in which a core body and a half clamp are arranged on a conveying mechanism, and after the injection molding is completed, the core body and the half clamp are synchronously moved along with the bottle blank and the core body by the axial dimension distance of the injection cavity to the blank demolding station, which can effectively improve the processing efficiency, reduce the equipment size and floor space, and can alternately perform injection molding operations and cooling and demolding operations on the bottle blanks, thereby ensuring product quality and improving production efficiency.

[0005] The present invention is realized in the following manner: an injection molding machine for preforms, comprising a frame and a conveying mechanism arranged on the frame, wherein the conveying mechanism can drive the preforms to move from an injection molding station to a stripping station, wherein an injection molding cavity is arranged at the injection molding station, and the conveying mechanism comprises a core body which can move axially back and forth and a half clamp which can be opened and closed, wherein the core body is axially inserted into the injection molding cavity and is enclosed with the half clamp to form a closed chamber for the injection molding preforms, wherein the half clamp clamps the preforms formed by injection molding and drives the preforms to separate from the core body when moving to the stripping station, wherein the core body moves synchronously with the half clamp and continuously cools and shapes the preforms before moving to the stripping station for stripping. The core is arranged on the conveying mechanism, and the core, the injection molding cavity, and the half clamp are enclosed to form a closed space for injection molding of preforms, and can be synchronously moved to the preform removal station with the preform after the injection molding is completed, which can not only save the action of the core to axially pull away from the preform at the injection molding station, but also improve the processing efficiency and production benefits by shortening the single processing time, and can also reduce the size of the injection molding machine by reducing the space reserved for the core movement, which is convenient for transportation and placement, and reduces the cost of raw materials required for production equipment. The core can also be used to cool and shape the preform, so that the structural strength of the preform when it is removed can cope with the impact when it falls, prevent the preform from collision and deformation, and reduce the number of waste products. The core can start to cool the preform when the preform is separated from the injection molding cavity until the preform is separated from the core. The injection molding cavity is provided with a cooling groove outside, which effectively utilizes the time for the preform to be transferred from the injection molding station to the preform removal station, and does not increase the single processing time.

[0006] Preferably, the core is arranged vertically, and the conveying mechanism includes a movable platform fixedly connected to the core, a first lifting component that drives the movable platform to lift vertically, and a translation component that drives the movable platform to move horizontally. The core is vertically plugged and pulled out of the injection cavity under the drive of the movable platform, and translates to the stripping station after being pulled out of the injection cavity. The core is fixedly connected to the movable platform, and the movable platform drives the core to move synchronously, thereby driving the core to move along a preset path. Specifically, the first lifting component plays a role in driving the movable platform to lift and lower, so that the core can be lifted and lowered under the drive of the movable platform, so that the core can switch between the insertion station for inserting into the injection cavity and the stripping station for stripping out of the injection cavity, ensuring that the preform is separated from the injection cavity; the translation component plays a role in driving the movable platform to move horizontally, so that the core can be translated under the drive of the movable platform, so that the core can be reciprocated between the injection station and the stripping station, ensuring that the preform is accurately conveyed to the stripping station.

[0007] Preferably, a second lifting assembly is provided at the bottom of the movable table to drive the half clamp to move up and down. When the preform moves to the blank removal station, the half clamp is driven to move downward and separate from the core. The second lifting assembly is installed between the movable table and the half clamp, and can drive the half clamp to independently lift relative to the movable table with the movable table as support, so that the half clamp can be lifted and lowered relative to the core, which can not only drive the preform and the core to vertically deviate, making it easier for the preform to separate from the core, but also control the upper convex rib to insert into the upper positioning groove and limit the opening of the half clamp, ensuring that the closed chamber remains sealed during injection molding.

[0008] Preferably, the injection cavities are multiple and arranged in a row, and the Huff clamp includes two symmetrically arranged clamps, and the side edges of the clamps facing each other are provided with a plurality of clamping openings corresponding to the injection cavities one by one. The Huff clamp can switch between a clamping state in which the clamps are tightly in contact with each other and an open state in which the clamps are separated from each other. When the Huff clamp switches from the open state to the clamping state, the clamping openings and the corresponding core body and the injection cavity enclose the closed chamber. Since the diameter of the preform is small, the injection molding mechanism can increase the number of preforms that can be processed at a time by setting a plurality of injection cavities arranged in a row, effectively improving production efficiency and reducing production costs. The Huff clamp includes two openable and closable clamps, and the two clamps clamp the preforms through corresponding clamping openings, which not only effectively simplifies the driving structure of the Huff clamp and reduces equipment costs, but also ensures that the preforms produced in the same batch can be clamped and transported synchronously, ensuring the reliability of the Huff clamp operation and improving the user experience.

[0009] Preferably, the periphery of the cavity mouth of the injection molding cavity is provided with a lower convex rib that bulges upward, and the bottom surface of the half clamp is provided with a lower positioning groove. When the half clamp, the core body and the injection molding cavity are combined to form a closed chamber, the lower convex rib is vertically inserted into the lower positioning groove, so that the half clamp is positioned in a clamped state and is arranged concentrically with the injection molding cavity. When the half clamp, the core body and the injection molding cavity are combined to form a closed chamber, the bottom surface of the half clamp will contact the periphery of the cavity mouth of the injection molding cavity, and the lower convex rib is vertically inserted into the lower positioning groove, which can ensure that the half clamp and the periphery of the cavity mouth of the injection molding cavity are sealed to prevent leakage of raw materials during injection molding, and can also prevent the half clamp from opening, ensuring that the half clamp can effectively resist the pressure from the liquefied raw materials during injection molding, and ensure that the contour of the closed chamber remains unchanged.

[0010] Preferably, the second lifting assembly includes a second oil cylinder arranged vertically, the cylinder body of the second oil cylinder is fixedly connected to the movable platform, the telescopic rod is fixedly connected to the half clamp fixing plate, and the second oil cylinder drives the half clamp to rise and fall relative to the movable platform through the half clamp fixing plate. The cylinder body of the second oil cylinder is fixedly connected to the movable platform, so that the second oil cylinder can lift and lower the half clamp based on the movable platform, thereby controlling the insertion and extraction relationship between the upper convex rib and the upper positioning groove, which can not only limit the opening of the half clamp after the upper convex rib is inserted into the upper positioning groove, but also facilitate the opening of the half clamp and detachment from the preform after the upper convex rib is pulled out of the upper positioning groove, ensuring that the preform can detach from the conveying mechanism at the preform stripping station.

[0011] Preferably, the first lifting assembly is a first oil cylinder arranged vertically, the cylinder body of the first oil cylinder is fixedly connected to the bracket, the telescopic rod is fixedly connected to the injection mold motor template, and the first oil cylinder drives the injection mold motor template to rise and fall, so that the translation assembly and the movable table are synchronously lifted and lowered, and the core body is driven to lift and switch between the insertion station for inserting downward into the injection cavity and the removal station for detaching upward from the injection cavity. The cylinder body of the first oil cylinder is fixedly connected to the frame, so that the first oil cylinder can drive the injection mold motor template to rise and fall based on the frame, and then the translation assembly, the movable table, the half clamp and the core body are synchronously lifted and lowered through the lifted injection mold motor template. The half clamp can realize the insertion and removal switching between the lower convex rib and the lower positioning groove by lifting relative to the injection cavity, which can not only limit the opening of the half clamp after the lower convex rib is inserted into the lower positioning groove, but also facilitate the opening of the half clamp and detachment of the preform after the lower convex rib is pulled out of the lower positioning groove, so as to ensure that the preform can be detached from the conveying mechanism at the stripping station.

[0012] Preferably, the translation assembly is fixedly connected to the injection mold motor template, the translation assembly is a horizontally arranged translation oil cylinder, the cylinder body of the translation oil cylinder is fixedly connected to the injection mold motor template, the telescopic rod is fixedly connected to the movable platform, and the translation assembly drives the movable platform to move horizontally. The cylinder body of the translation oil cylinder is fixedly connected to the injection mold motor template, so that the translation oil cylinder can drive the movable platform, the core body and the half clamp to move back and forth between the injection station and the blank removal station based on the injection mold motor template, thereby realizing a cyclic reciprocating bottle blank transfer action, effectively improving production efficiency.

[0013] Preferably, the translation assembly includes a slide rail arranged on the injection mold motor template and a slider arranged on the movable table, and the slider slides horizontally along the slide rail so that the movable table drives the core body to translate back and forth between the injection station and the stripping station. The slide rail guides and limits the slider, ensuring that the movable table can reciprocate along a preset path, thereby ensuring that the core body and the half clamp can translate accurately with the movable table.

[0014] Preferably, the core is vertically inserted into the injection cavity and is positioned by a limiting assembly, the limiting assembly includes a limiting ring fixed to the movable table, the outer wall of the core is tightly fitted with the inner wall of the limiting ring, so as to reduce the radial displacement of the core during the injection of the preform. The limiting ring is sleeved on the core and fixed to the movable table, the top of the core is fixed to the movable table, the middle outer wall is tightly fitted with the inner wall of the limiting ring, so that the middle section of the core is radially limited by the limiting ring, ensuring that the core always maintains a vertical posture, effectively reducing the radial displacement of the core during injection, and then ensuring that the wall thickness of each area of ​​the preform meets the preset requirements, ensuring product quality.

[0015] Preferably, the bottom of the limit ring extends downward to form an upper convex rib, and the top surface of the half clamp is provided with an upper positioning groove. When the half clamp, the core body and the injection cavity are enclosed to form a closed chamber, the upper convex rib is vertically inserted into the upper positioning groove, and the inner side wall of the limit ring is tightly fitted with the outer side wall of the core body, so that the half clamp and the core body are concentrically arranged. When the half clamp is driven upward by the second lifting assembly, the upper convex rib is inserted into the upper positioning groove, ensuring that the half clamp can effectively cope with the pressure from the liquefied raw material and ensure that the contour of the closed chamber remains stable.

[0016] Preferably, a sealing ring surface exposed downward is provided on the outer side wall of the core body. When the core body is inserted into the injection molding cavity, the sealing ring surface is tightly overlapped on the top surface of the half clamp from top to bottom, so that the core body is sealed and connected to the half clamp through the sealing ring surface. After the core body is inserted downward into the injection molding cavity driven by the first lifting assembly, the half clamp is clamped between the limit ring and the cavity opening of the injection molding cavity, and the sealing ring surface of the core body is overlapped on the periphery of the upper port of the clamp opening and enclosed with the injection molding cavity to form a closed chamber.

[0017] Preferably, the core is provided with a cooling pipe opened along its axial direction, and a cooling water tank is provided outside the injection cavity. The cooling medium flowing through the cooling pipe and the cooling water tank absorbs the heat in the injection cavity, so that the preform is cooled and shaped during production. The core is provided with a cooling pipe for the cooling medium to flow. When in use, the preform after injection transfers heat to the core, and the cooling medium flows through the cooling pipe and takes away the heat on the core, so that the preform is cooled and shaped because the heat is taken away by the cooling medium. The cooling medium flows continuously in the cooling pipe, so that the preform can be continuously cooled before it is separated from the core at the stripping station, and the preform is effectively cooled and shaped during the transportation time of the preform.

[0018] Preferably, there are two blank removal stations and they are arranged on both sides of the injection molding station. The conveying mechanism includes two groups of cores fixedly connected to the movable table. The cores are alternately inserted into the injection molding cavity and injection-molded to form bottle blanks that can be conveyed to the corresponding blank removal station. It takes time for the injection molding mechanism to inject and form bottle blanks, and it also takes time to cool the bottle blanks and move them to the blank removal station. By setting two groups of cores and two groups of half clamps to alternately cooperate with the injection molding cavity and alternately convey them to the blank removal stations on both sides for blank removal operations, the injection molding cavity can be continuously injection-molded, effectively improving the processing efficiency of the injection molding mechanism, and two blank removal stations can be set to alternately receive the processed bottle blanks, preventing the bottle blanks from falling off the half clamps when the cooling is not thorough and causing impact deformation. The two groups of cores are fixedly connected to the same movable table, so that the two groups of cores move synchronously, effectively simplifying the structure of the transportation mechanism, improving the operating reliability and reducing the cost of production equipment. When one group of core bodies moves to the stripping station, the other group of core bodies moves to the injection molding station, ensuring that the two groups of core bodies can move back and forth between the injection molding station and the corresponding stripping station in a staggered manner.

[0019] Preferably, a cooling water tank is provided under the blank removing station, and the bottle blank is separated from the core and falls into the cooling water tank so that the bottle blank is continuously cooled. The cooling water tank stores cooling water, which can be used to receive the fallen bottle blank to prevent the bottle blank from deformation and adhesion due to collision with hard objects, and can also be used to continuously cool the bottle blank, thereby effectively improving the structural strength of the bottle blank.

[0020] Preferably, a cooling fan is provided below the blank stripping station, and the cooling fan forms a cooling airflow, and the preform contacts the cooling airflow and is continuously cooled. The cooling fan can drive the surrounding low-temperature air to flow toward the preform, thereby taking away the heat attached to the preform, and by reducing the temperature of the preform, improve its structural strength, thereby improving production efficiency.

[0021] The outstanding beneficial effects of the present invention are as follows: the core body is arranged on the conveying mechanism, and the core body, the injection cavity and the half clamp are combined to form a closed space for injection molding of bottle blanks, and can be synchronously moved to the demolding station with the bottle blank after the injection molding is completed, which can not only save the action of pulling the core body upward away from the bottle blank at the injection molding station, but also improve the processing efficiency by shortening the single processing time, and can also reduce the height of the injection molding machine by reducing the space reserved for the lifting of the core body, which is convenient for transportation and placement, and reduces the cost of raw materials required for production equipment. The core body can also be used to cool and shape the bottle blank, so that the structural strength of the bottle blank during demolding can cope with the impact when the blank is dropped, prevent the bottle blank from colliding, deforming and sticking, and reduce the number of waste products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial cross-sectional structural schematic diagram of the core of the injection molding machine for preforms of bottles when it is in the insertion station;

[0023] Figure 2 It is a schematic diagram of a partial cross-sectional structure when the core body, the injection cavity and the half clamp are enclosed to form a closed chamber;

[0024] Figure 3 It is a partial cross-sectional structural schematic diagram of the core of the injection molding machine for preforms of bottles when it is in the pulling-out position;

[0025] Figure 4 is a schematic diagram of the structure of the half clamp when it is in the clamping position;

[0026] In the figure: 1. frame, 2. conveying mechanism, 3. injection molding station, 4. stripping station, 5. injection molding cavity, 6. core, 7. half clamp, 8. movable table, 9. clamp, 10. clamp, 11. lower rib, 12. lower positioning groove, 13. first lifting assembly, 14. second lifting assembly, 15. translation assembly, 16. injection mold motor template, 17. limit ring, 18. upper positioning groove, 19. upper rib, 20. half fixing plate, 21. sealing ring surface, 22. cooling pipe. DETAILED DESCRIPTION

[0027] The essential features of the present invention are further described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1 and 2 The illustrated example is an injection molding machine for preforms, which is composed of a frame 1 and a conveying mechanism 2 arranged on the frame 1. The conveying mechanism 2 can drive the preforms to move from an injection molding station 3 to a stripping station 4. An injection molding cavity 5 is arranged at the injection molding station 3. The conveying mechanism 2 includes a core body 6 that can be lifted and lowered vertically and a half clamp 7 that can be opened and closed. The core body 6 is vertically inserted into the injection molding cavity 5 and is enclosed with the half clamp 7 to form a closed chamber for the injection molding of the preforms. The half clamp 7 clamps the injection-molded preforms and drives the preforms to separate from the core body 6 when moving to the stripping station 4. The core body 6 moves synchronously with the half clamp 7 and cools and shapes the preforms before moving to the stripping station 4 for stripping. The core body 6 is arranged on the conveying mechanism 2, and the core body 6, the injection cavity 5, and the half clamp 7 are enclosed to form a closed space for injection molding of the preform, and can be moved to the demolding station 4 after the injection molding is completed, which can not only save the action of pulling the core body 6 upward away from the preform at the injection molding station 3, but also make the core body, the half clamp and the preform lift upward a shorter distance to achieve the purpose of pulling out of the injection cavity, and improve the processing efficiency by shortening the single processing time. It can also reduce the height of the injection molding machine by reducing the space reserved for the lifting of the core body 6, which is convenient for transportation and placement, and reduces the cost of raw materials required for production equipment. The core body 6 can also be used to cool and shape the preform, so that the structural strength of the preform when demolding can cope with the impact when the preform falls, prevent the preform from collision and deformation, and reduce the number of waste products.

[0029] In actual operation, the conveying mechanism 2 includes a movable table 8 fixedly connected to the core body 6, a first lifting component 13 that drives the movable table 8 to lift vertically, and a translation component 15 that drives the movable table 8 to move horizontally. The core body 6 is vertically plugged and pulled out of the injection cavity 5 under the drive of the movable table 8, and translates to the blank removal station 4 after being pulled out of the injection cavity 5. A second lifting component 14 that drives the half clamp 7 to lift is provided at the bottom of the movable table 8. When the preform moves to the blank removal station 4, it is driven by the half clamp 7 to move downward and separate from the core body 6. The movable table 8, the core body 6 and the half clamp 7 are controlled by the first lifting component 13, the translation component 15 and the second lifting component 14 to complete the injection molding of the preform. Specifically, the injection molding mechanism, the conveying mechanism 2 and the blank connection mechanism realize the processing of the preform through the following steps:

[0030] In the first step, the injection molding mechanism heats and liquefies the raw material through the barrel screw, and the movable table 8 is first moved to the top of the injection molding mechanism under the driving of the translation assembly 15, and then moved downward under the driving of the first lifting assembly 13, so that the core 6 is inserted into the injection cavity 5 from top to bottom. During this process, the half clamp 7 is closed, and the second lifting assembly 14 drives the half clamp 7 to rise through the half fixing plate 20, so that the upper rib 19 is inserted into the upper positioning groove 18;

[0031] In the second step, the first lifting assembly 13 drives the movable platform 8 to continue to descend until the bottom surface of the half clamp 7 contacts the periphery of the cavity opening of the injection cavity 5, and the lower rib 11 is inserted into the lower positioning groove 12, and the half clamp 7, the core body 6 and the injection cavity 5 enclose a closed chamber isolated from the outside world;

[0032] In the third step, the injection molding mechanism includes a hot runner, and the liquefied raw material is injected into the closed chamber under the pushing action of the injection cylinder. There is a cooling channel outside the closed chamber for cooling water to flow through, and then the cooling medium is transported to the cooling channel in the injection mold and the core 6 to cool and shape the raw material in the closed chamber, thereby obtaining a bottle blank. At this time, the outline of the bottle blank is fixed and in a softened state, the core 6 is inserted into the bottle blank, and the blank mouth of the bottle blank is clamped by the half clamp 7;

[0033] Step 4: By simultaneously controlling the first lifting assembly 13 to synchronously lift the core 6 and the half clamp 7, the outer wall of the preform is separated from the inner wall of the injection cavity 5, and the core and the half clamp are tightly fitted to the preform, and the cooling medium is continuously transported in the cooling channel to continuously cool the preform;

[0034] Step 5: The first lifting assembly 13 is used to drive the movable table 8 to continue to rise, and the core 6, the preform and the half clamp 7 are all synchronously raised with the movable table 8, so that the core 6 is switched to the pulling-off position (such as Figure 3 As shown in the figure, the preform is completely separated from the injection cavity 5, the cooling medium is continuously transported in the cooling channel, the preform is continuously cooled, and the lower rib 11 is vertically separated from the lower positioning groove 12;

[0035] Step 6: The movable table 8 is driven to translate from the injection station 3 to the blank removal station 4 by the translation assembly 15, and the core 6, the bottle body and the half clamp 7 are translated synchronously with the movable table 8, and the cooling medium is continuously transported in the cooling channel to continuously cool the bottle blank;

[0036] Step 7: The second lifting assembly 14 is used to drive the half clamp 7 to move downward, so that the upper rib 19 is vertically separated from the upper positioning groove 18, and the outer wall of the core body 6 and the inner wall of the preform are separated from each other due to the vertical offset;

[0037] In the eighth step, the half clamp 7 is opened and separated from the blank mouth of the bottle blank, and the bottle blank is separated from the conveying mechanism 2 and received by the blank receiving structure.

[0038] During the processing, the core 6, the half clamp 7 and the preform are lifted synchronously and can move horizontally after the preform leaves the injection cavity. By shortening the time for the preform to leave the injection cavity, the preparation time for the injection cavity to perform injection molding again is shortened, effectively improving the processing efficiency. The core 6 does not need to be pulled out of the preform, and there is no need to provide the core 6 with the space required to pull out the preform. It can effectively save the time required for the core 6 to pull out the preform, improve the processing efficiency by shortening the single processing time, and effectively reduce the overall height of the equipment and the space required for operation, which is convenient for assembly and use.

[0039] In actual operation, there are two blank removal stations 4 and they are separately arranged on both sides of the injection molding station 3. Two groups of core bodies 6 and second lifting components 14 and half clamps 7 corresponding to the core bodies 6 are arranged on the movable platform 8. The core bodies 6 can be synchronously translated and lifted under the drive of the same movable platform 8, so that the two groups of core bodies 6 can alternately obtain the injection-molded preforms at the injection molding mechanism under the cooperation of the corresponding half clamps 7 and convey them to the corresponding blank removal stations 4. Specifically, the conveying mechanism 2 includes a No. 1 core group and a No. 2 core group composed of rows and separately arranged on both sides of the movable platform 8. The No. 1 blank removal station 4 corresponding to the No. 1 core group and the No. 2 blank removal station 4 corresponding to the No. 2 core group are respectively arranged on both sides of the injection molding station 3. During operation, first, core group No. 1 is inserted into the injection molding cavity 5 and processed to obtain a preform, core group No. 2 is located at the preform removal station No. 4 to perform a preform removal operation, and then, under the unified drive of the movable table 8, core group No. 2 moves into the injection molding cavity 5 and processes to obtain a preform, and core group No. 1 moves to the preform removal station No. 4 to perform a preform removal operation. By repeating the above operations, the two groups of core bodies 6 alternately obtain the injection-molded preforms at the injection molding cavity 5 and transport them to the corresponding preform removal station 4.

[0040] In actual operation, the half clamp 7 includes two symmetrically arranged clamping plates 9 (such as Figure 4As shown in the figure, the Huff clamp 7 can be switched between a clamping state in which the clamps 9 are tightly in contact with each other and an open state in which the clamps 9 are separated in a back-to-back manner. When the Huff clamp 7 is switched from an open state to a clamping state, the clamping opening 10 and the corresponding core body 6 and injection cavity 5 are enclosed to form the closed chamber. When the Huff clamp 7 is switched to an open state, the clamps 9 are separated in a back-to-back manner, so that the Huff clamp 7 is separated from the blank mouth of the bottle blank, ensuring that the bottle blank can fall from the conveying mechanism 2 at the blank removal station 4 and be received by the blank receiving mechanism. When the Huff clamp 7 is switched to a clamping state and the core body 6 is in the insertion station, the clamping openings 10 on the two clamps 9 are butted against each other and enclosed with the core body 6 and the injection cavity 5 to form a closed chamber. When the injection molding of the bottle blank is completed, the Huff clamp 7 will be clamped on the blank mouth formed by the injection molding, playing a role in clamping and transporting the bottle blank, ensuring that the bottle blank can vertically separate from the injection cavity 5 and move horizontally to the blank removal station 4.

[0041] In actual operation, there are multiple injection cavities 5 arranged in a row, and a plurality of clamps 10 corresponding to the injection cavities 5 are provided on the facing side edges of the clamping plates 9. In order to improve processing efficiency, the injection molding mechanism improves processing efficiency by setting multiple injection cavities 5 that can simultaneously inject and form bottle blanks. Specifically, the injection cavities 5 are arranged in a row, so that the injection cavities 5 are all located on the same straight line, and the injection cavities 5 located in the same row are all matched with the same half clamp 7. The half clamp 7 uses a long strip of clamping plates 9 to uniformly match with each injection cavity 5, which can effectively simplify the structure of the half clamp 7 and ensure that the half clamp 7 can be uniformly matched with each injection cavity 5, ensuring that the contour of the bottle blank is uniform and accurately transported.

[0042] In actual operation, the clamping plates 9 can be movably installed under the half fixing plate 20, and the half fixing plate 20 is installed at the bottom of the movable platform 8 through the second lifting assembly 14, which not only ensures that the clamping plates 9 can switch the half clamp 7 between the open state and the clamping state through the opening and closing action, but also can use the second lifting assembly 14 to achieve independent lifting adjustment relative to the movable platform 8. Specifically, the second lifting assembly 14 includes a second oil cylinder arranged vertically, the cylinder body of the second oil cylinder is fixedly connected to the movable platform 8, and the telescopic rod is fixedly connected to the half fixing plate 20. The second oil cylinder drives the half clamp 7 to rise and fall relative to the movable platform 8 through the half fixing plate 20. At least two separate second oil cylinders are provided between the Huff fixed plate 20 and the movable platform 8, and the second oil cylinders act synchronously to ensure the smooth lifting and lowering of the Huff fixed plate 20. In the preferred embodiment, there are four second oil cylinders, which are separately disposed at the corners of the Huff fixed plate 20, and the cylinder body of the second oil cylinder is fixedly connected to the side wall of the movable platform 8, so that the top surface of the Huff fixed plate 20 can approach the bottom surface of the movable platform 8 when the second oil cylinder contracts, ensuring that the sealing ring surface 21 of the core body 6 can fit tightly with the upper edge of the clamping mouth 10 of the Huff clamp 7. The Huff fixing plate 20 is provided with a through hole. During installation, the core body 6 passes through the through hole and extends downward. When the Huff fixing plate 20 drives the Huff clamp 7 to rise under the drive of the second lifting assembly 14, the bottom of the limit ring 17 passes through the through hole and abuts against the top surface of the Huff clamp 7, so that the upper rib 19 and the upper positioning groove 18 are vertically inserted, and the sealing ring surface 21 of the core body 6 vertically passes through the through hole and abuts against the upper peripheral edge of the clamping mouth 10 of the Huff clamp 7.

[0043] In actual operation, the first lifting component 13 is a first oil cylinder arranged vertically, the cylinder body of the first oil cylinder is fixedly connected to the bracket, and the telescopic rod is fixedly connected to the injection mold movable template 16. The first oil cylinder drives the injection mold movable template 16 to rise and fall, so that the translation component 15 and the movable table 8 can be lifted and lowered synchronously and drive the core body 6 to lift and switch between the insertion station for inserting downward into the injection cavity 5 and the removal station for separating upward from the injection cavity 5. The first oil cylinder is connected and fixed by the bracket, so that the telescopic rod of the first oil cylinder can drive the injection mold movable template 16 to rise and fall, and then drive the translation component 15, the movable table 8, the core body 6 and the half clamp 7 to rise and fall synchronously, which ensures that the core body 6 can be lifted and lowered between the insertion station and the removal station, and also ensures that the half clamp 7 can clamp the bottle blank and the core body 6 to rise and fall synchronously.

[0044] In actual operation, the translation assembly 15 is fixedly connected to the injection mold motorized plate 16. The translation assembly 15 is a horizontally arranged translation oil cylinder. The cylinder body of the translation oil cylinder is fixedly connected to the injection mold motorized plate 16. The telescopic rod is fixedly connected to the movable platform 8. The translation assembly 15 drives the movable platform 8 to move horizontally. Specifically, the translation assembly 15 includes a slide rail arranged on the injection mold motorized plate 16 and a slider arranged on the movable platform 8. The slider slides horizontally along the slide rail so that the movable platform 8 drives the core 6 to move back and forth between the injection station 3 and the stripping station 4. The injection mold motorized template 16 is provided with two separate and parallel slide rails, and the movable platform 8 is provided with a slider slidably connected to the slide rails. After installation, the movable platform 8 can be horizontally slidably suspended below the injection mold motorized template 16 through the slider, which ensures that the movable platform 8 can be raised and lowered synchronously with the injection mold motorized template 16, and that the movable platform 8 can slide horizontally relative to the injection mold motorized template 16, ensuring that the core body 6 can independently perform vertical lifting and horizontal sliding movements, and ensuring that the core body 6 can accurately move along a preset path.

[0045] In actual operation, the contour of the closed chamber is effectively limited to ensure that the preform formed by injection molding has a uniform contour. Specifically, the movable table 8 moves downward and drives the core 6 and the half clamp 7 in the clamping state to move downward synchronously. When the core 6 is inserted into the injection cavity 5 and descends to the insertion station, the sealing ring surface 21 of the core 6 overlaps the upper edge of the clamp 10 through its outer edge, ensuring that the clamp 10 is sealed with the sealing ring surface 21; the limiting ring 17 fixed to the movable table 8 is placed on the core 6, so that the outer wall of the core 6 above the sealing ring surface 21 is tightly fitted with the inner wall of the limiting ring 17, ensuring that the limiting ring 17 The limiting ring 17 is arranged concentrically with the core body 6; the bottom surface of the limiting ring 17 extends downward to form an upper convex rib 19, and the top surface of the half clamp 7 is provided with an upper positioning groove 18. The second lifting component 14 contracts and drives the upper convex rib 19 to be inserted into the upper positioning groove 18, so that the limiting ring 17 and the half clamp 7 are arranged concentrically; the bottom surface of the half clamp 7 is provided with a lower positioning groove 12, and the periphery of the cavity mouth of the injection cavity 5 is provided with a lower convex rib 11. The half clamp 7 falls with the movable platform 8 and contacts the periphery of the cavity mouth of the injection cavity 5, and the lower convex rib 11 is inserted into the lower positioning groove 12, so that the half clamp 7 and the injection cavity 5 are arranged concentrically. Since the core body 6 and the limiting ring 17 are concentrically arranged, the limiting ring 17 and the half clamp 7 are concentrically arranged, and the half clamp 7 and the injection cavity 5 are concentrically arranged, when the core body 6 and the half clamp 7 are driven by the movable platform 8 to enclose the injection cavity 5 to form a closed chamber, the core body 6 and the injection cavity 5 are concentrically arranged, thereby ensuring that the bottle blank formed by injection molding has a uniform outline size and wall thickness, effectively ensuring the quality of the bottle blank.

[0046] In actual operation, the core 6 is vertically inserted into the injection cavity 5 and is positioned by the limiting assembly, which includes a limiting ring 17 fixedly connected to the movable platform 8. The outer wall of the core 6 is tightly fitted with the inner wall of the limiting ring 17 to reduce the radial deviation of the core 6 during the injection of the preform. The limiting ring 17 is tightly sleeved on the middle section of the core 6, the limiting ring 17 is fixedly connected to the movable platform 8, and the top of the core 6 is fixedly connected to the movable platform 8, ensuring that the top and middle section of the core 6 move synchronously with the movable platform 8, ensuring that the core 6 always maintains a vertical posture.

[0047] In actual operation, the periphery of the cavity opening of the injection cavity 5 is provided with a lower convex rib 11 that bulges upward, and the bottom surface of the half clamp 7 is provided with a lower positioning groove 12. When the half clamp 7, the core body 6 and the injection cavity 5 are enclosed to form a closed chamber, the lower convex rib 11 is vertically inserted into the lower positioning groove 12, so that the half clamp 7 is positioned in a clamping state and is arranged concentrically with the injection cavity 5. The bottom of the limit ring 17 extends downward to form an upper convex rib 19, and the top surface of the half clamp 7 is provided with an upper positioning groove 18. When the half clamp 7, the core body 6 and the injection cavity 5 are enclosed to form a closed chamber, the upper convex rib 19 is vertically inserted into the upper positioning groove 18, and the inner side wall of the limit ring 17 is tightly fitted with the outer side wall of the core body 6, so that the half clamp 7 and the core body 6 are arranged concentrically with each other. Specifically, the lower rib 11, the lower positioning groove 12, the upper rib 19 and the upper positioning groove 18 are all truncated cone-shaped, which not only guides the insertion, but also plays a role of horizontal locking after being inserted in place, ensuring that the lower rib 11 and the lower positioning groove 12, the upper rib 19 and the upper positioning groove 18 are matched and plugged and effectively limited in the horizontal plane. The upper positioning groove 18 and the lower positioning groove 12 are respectively arranged on the top and bottom surfaces of the clamping plate 9 corresponding to each clamping opening 10, ensuring that each section of the clamping plate 9 has good positioning stability.

[0048] In this embodiment, the outer wall of the core body 6 is provided with a sealing ring surface 21 exposed downward. When the core body 6 is inserted into the injection cavity 5, the sealing ring surface 21 is tightly overlapped on the top surface of the half clamp 7 from top to bottom, so that the core body 6 is sealed and connected to the half clamp 7 through the sealing ring surface 21. The half clamp 7 moves upward under the driving of the second lifting assembly 14 and seals and fits with the outer edge of the sealing ring surface 21 through the upper edge of the clamping opening 10, so that the outer wall of the core body 6, the inner wall of the clamping opening 10 of the half clamp 7 and the inner edge of the sealing ring surface 21 enclose a space for injection molding to form the preform opening.

[0049] In this embodiment, the core 6 is provided with a cooling channel 22 opened along its axial direction, and the cooling medium flowing through the cooling channel 22 absorbs the heat in the core 6, so that the preform is cooled and shaped during production. The cooling channel 22 is arranged along the axis of the core 6 and is provided with a loop, so that the core 6 can obtain the cooling medium continuously delivered through the cooling channel 22, and then the preform sleeved on the core 6 is continuously cooled, ensuring that the preform is separated from the core 6 after having good structural strength. When the cooling medium is delivered to the cooling channel, it means that the cooling and shaping operation is started, and when the cooling medium is stopped, it means that the cooling and shaping operation is stopped. For the timing of the implementation of the cooling and shaping operation, the preferred scheme is that it starts after the raw material fills the closed chamber and ends when the preform is separated from the core 6, which not only effectively utilizes the time required for the preform to be transferred from the injection molding station 3 to the preform removal station 4, but also ensures that the raw material has good fluidity when injected into the closed chamber by stopping the delivery of the cooling medium, ensuring that the raw material can fill the closed chamber. The cooling medium is cooling water, which can not only transfer heat and improve the cooling effect, but also has good fluidity, and the cooling efficiency is improved by increasing the flow rate of the cooling medium.

[0050] In actual operation, a blank receiving mechanism is provided below the blank removing station 4, which can not only gently receive the bottle blank, but also continuously cool the bottle blank to ensure that the bottle blank is further cooled and shaped. When the movable platform 8 descends and drives the No. 1 core group to be inserted into the injection cavity 5, the No. 2 core group descends synchronously with the movable platform 8, so that the distance between the bottle blank and the blank receiving mechanism is shortened. At this time, the bottle blank will first move downward under the drive of the half clamp 7 driven by the second lifting component 14, so that the distance between the bottle blank and the blank receiving assembly continues to shorten and the inner side wall is completely separated from the outer side wall of the core body 6, and then when the half clamp 7 is switched to the open state, it is separated from the conveying mechanism 2 and falls into the blank receiving mechanism under the action of its own gravity, so that the bottle blanks are collected and transported outward in a centralized manner.

[0051] Specifically, the blank joining mechanism includes but is not limited to the following structures:

[0052] Structure 1: the blank receiving mechanism may be a cooling water tank disposed below the blank stripping station 4. The bottle blanks are separated from the core 6 and fall into the cooling water tank so that the bottle blanks are continuously cooled. The cooling water in the cooling water tank can not only gently receive the fallen bottle blanks, but also continuously cool the bottle blanks.

[0053] Structure 2: the blank receiving mechanism is a cooling fan arranged below the blank stripping station 4, the cooling fan forms a cooling airflow, the cooling airflow can not only slow down the falling speed of the bottle blank, but also continuously cool the bottle blank;

[0054] Structure three, the blank connection component can also be a movable support frame, and the fallen bottle blank is overlapped on the support frame through the blank mouth, so that the bottle body of the bottle blank is suspended, which can not only prevent the bottle body from being deformed due to impact, but also ensure that the bottle body is suspended and cooled.

[0055] The above-mentioned blank connection structures can be selected and configured according to actual conditions, and should all be regarded as specific embodiments of the present invention.

[0056] In the present invention, the first lifting assembly, the second lifting assembly and the translation assembly are all oil cylinders, and can also be changed to driving structures such as air cylinders and lead screws as needed, which should be regarded as specific embodiments of the present invention.

[0057] In the present invention, the core body can be arranged vertically and is suitable for a vertical injection molding machine. It can also be improved according to actual conditions to arrange the core body and the injection cavity horizontally and be suitable for a horizontal injection molding machine. The telescopic direction of the first lifting assembly and the second lifting assembly is changed to a horizontal direction perpendicular to the moving path of the translation assembly, so that the two groups of core bodies can separate from the injection cavity along their axial direction and then transport the preforms alternately to both sides, which should also be regarded as a specific embodiment of the present invention.

Claims

1. A preform injection molding machine, comprising a frame (1) and a conveying mechanism (2) arranged on the frame (1), wherein the conveying mechanism (2) can drive the preform to move from an injection molding station (3) to a preform removal station (4), wherein the injection molding station (3) is provided with an injection molding cavity (5), It is characterized in that The conveying mechanism (2) comprises a core body (6) that can axially reciprocate and a half clamp (7) that can be switched on and off. The core body (6) is axially inserted into the injection molding cavity (5) and enclosed with the half clamp (7) to form a closed chamber for injection molding the preform. The half clamp (7) clamps the preform formed by injection molding and drives the preform to separate from the core body (6) when moving to the preform removal station (4). The core body (6) and the half clamp (7) move synchronously and cool the preform before moving to the preform removal station (4) to remove the preform. The core body (6) is arranged vertically, and the conveying mechanism (2) comprises a movable platform (8) fixedly connected to the core body (6), a first lifting component (13) driving the movable platform (8) to lift vertically, and a translation component (15) driving the movable platform (8) to move horizontally. The core body (6) is driven by the movable platform (8) to vertically plug and pull with the injection cavity (5) and translates toward the stripping station (4) after being pulled out of the injection cavity (5). The periphery of the cavity opening of the injection cavity (5) is provided with an upward protrusion. The lower convex rib (11) is provided on the bottom surface of the half clamp (7), and a lower positioning groove (12) is provided. When the half clamp (7), the core body (6) and the injection molding cavity (5) are enclosed to form a closed chamber, the lower convex rib (11) is vertically inserted into the lower positioning groove (12) so that the half clamp (7) is positioned in a clamping state and is arranged concentrically with the injection molding cavity (5); or, the second lifting component (14) includes a second oil cylinder arranged vertically, and the cylinder body of the second oil cylinder is connected to the movable platform (8) is fixedly connected, the telescopic rod is fixedly connected to the Huff fixing plate (20), the second oil cylinder drives the Huff clamp (7) to rise and fall relative to the movable platform (8) through the Huff fixing plate (20), the core body (6) is vertically inserted into the injection cavity (5) and is clamped and positioned by the limiting component, the limiting component includes a limiting ring (17) fixedly connected to the movable platform (8), the outer wall of the core body (6) is tightly fitted with the inner wall of the limiting ring (17) to reduce the radial deviation of the core body (6) when the bottle blank is injected.

2. The preform injection molding machine according to claim 1, It is characterized in that A second lifting assembly (14) for driving the half clamp (7) to move up and down is provided at the bottom of the movable platform (8); when the preform moves to the blank removal station (4), it is driven by the half clamp (7) to move downward and separate from the core body (6).

3. The preform injection molding machine according to claim 2, It is characterized in that The injection molding cavities (5) are multiple and arranged in a row. The half clamp (7) includes two symmetrically arranged clamping plates (9). The side edges of the clamping plates (9) facing each other are provided with a plurality of clamping openings (10) corresponding to the injection molding cavities (5) one by one. The half clamp (7) can be switched between a clamping state in which the clamping plates (9) are tightly in contact with each other and an open state in which the clamping plates (9) are separated from each other. When the half clamp (7) is switched from the open state to the clamping state, the clamping openings (10) and the corresponding core body (6) and the injection molding cavity (5) are enclosed to form the closed chamber.

4. The preform injection molding machine according to claim 1, It is characterized in that The first lifting component (13) is a first oil cylinder arranged vertically, the cylinder body of the first oil cylinder is fixedly connected to the bracket, the telescopic rod is fixedly connected to the injection mold movable template (16), and the first oil cylinder drives the injection mold movable template (16) to rise and fall, so that the translation component (15) and the movable table (8) are synchronously raised and lowered and drives the core body (6) to rise and fall between the insertion position for inserting downward into the injection cavity (5) and the removal position for detaching upward from the injection cavity (5); Alternatively, the translation assembly (15) is fixedly connected to the injection mold movable template (16), the translation assembly (15) is a horizontally arranged translation cylinder, the cylinder body of the translation cylinder is fixedly connected to the injection mold movable template (16), the telescopic rod is fixedly connected to the movable platform (8), and the translation assembly (15) drives the movable platform (8) to move horizontally; or, the translation assembly (15) includes a slide rail arranged on the injection mold movable template (16) and a slider arranged on the movable platform (8), and the slider slides horizontally along the slide rail so that the movable platform (8) drives the core body (6) to move back and forth between the injection molding station (3) and the demolding station (4).

5. The preform injection molding machine according to claim 1, It is characterized in that The bottom of the limiting ring (17) extends downward to form an upper convex rib (19), and the top surface of the half clamp (7) is provided with an upper positioning groove (18). When the half clamp (7), the core body (6) and the injection molding cavity (5) are enclosed to form a closed chamber, the upper convex rib (19) is vertically inserted into the upper positioning groove (18), and the inner wall of the limiting ring (17) is tightly fitted with the outer wall of the core body (6), so that the half clamp (7) and the core body (6) are arranged concentrically with each other; or, the outer wall of the core body (6) is provided with a sealing ring surface (21) exposed downward, and when the core body (6) is inserted into the injection molding cavity (5), the sealing ring surface (21) is tightly overlapped on the top surface of the half clamp (7) from top to bottom, so that the core body (6) is sealed and connected to the half clamp (7) through the sealing ring surface (21).

6. An injection molding machine for preforms according to any one of claims 1 to 5, It is characterized in that The core (6) is provided with a cooling pipe (22) opened along its axial direction, and the injection cavity 5 is provided with a cooling water tank. The cooling medium flowing through the cooling pipe (22) and the cooling water tank absorbs the heat in the injection cavity, so that the preform is cooled and shaped during production.

7. An injection molding machine for preforms according to any one of claims 1 to 5, It is characterized in that There are two blank removal stations (4) disposed on both sides of the injection molding station (3); the conveying mechanism (2) comprises two groups of core bodies (6) fixedly connected to the movable table (8); the core bodies (6) are alternately inserted into the injection molding cavity (5) and injection-molded to form bottle blanks that can be conveyed to the corresponding blank removal station (4); or, a cooling water tank is provided below the blank removal station (4); the bottle blanks are separated from the core bodies (6) and fall into the cooling water tank so that the bottle blanks are continuously cooled; or, a cooling fan is provided below the blank removal station (4); the cooling fan forms a cooling airflow; the bottle blanks are in contact with the cooling airflow and are continuously cooled.

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