Plastic bottle blow molding equipment and method

Abstract

The embodiment of the invention relates to the technical field of blow molding, and provides plastic bottle blow molding equipment and method.The equipment is used for blow molding a bottle blank into a plastic bottle and comprises a mold, the mold is provided with a mold cavity, the mold cavity is provided with a cavity opening, and the bottom of the mold cavity is provided with a containing groove; the stretching rod is movably arranged, penetrates through the cavity opening after moving and stretches into the mold cavity; the movable supporting piece is movably arranged in the mold cavity, the movable supporting piece moves downwards and then moves into the containing groove, and a bottle clamping interval used for clamping the bottom of the plastic bottle is formed between the movable supporting piece and the stretching rod; one end of the first elastic piece acts on the mold, and the other end of the first elastic piece acts on the movable supporting piece to provide force for the movable supporting piece to move upwards to be close to the stretching rod. By means of the technical scheme, the technical problem that in the prior art, when plastic bottles with the small thickness and the large diameter are subjected to blow molding, some flaws are likely to appear on the plastic bottles due to the fact that the stretching rod pushes the inner bottoms of bottle blanks is solved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of blow molding, and in particular, to a plastic bottle blow molding device and method. Background Art

[0002] Plastic bottle blow molding is a process in which the plastic raw materials are heated and melted, and then made into tubular bottle blanks (also called bottle blanks or blanks) through extrusion or injection. The bottle blanks are then placed in the mold cavity while hot, and compressed air is then introduced into the bottle blanks to make them expand and fit tightly against the inner wall of the mold cavity. After cooling and shaping, a plastic bottle with the same shape as the mold cavity can be obtained.

[0003] During the blow molding process of plastic bottles, the formed preform is quickly transferred to the blow molding mold, and the mold is closed to form a closed cavity. The blow molding mold is usually composed of two halves of the mold. The shape and size of the mold cavity determine the final shape and size of the plastic bottle. The mold surface needs to have a good finish to ensure the appearance quality of the plastic bottle. When blowing the preform, the preform must be heated first, so that the stretching rod pushes the bottom of the preform against the bottom and pushes it down slowly, and compressed air is introduced into the preform. The compressed air expands the preform and clings to the inner wall of the mold cavity. During the blowing process, the preform will be stretched and deformed to form the body, bottleneck, bottom and other parts of the plastic bottle. In order to make the wall thickness of the plastic bottle uniform, sometimes segmented blowing or adjusting the cooling speed of different parts of the mold are used. While blowing the preform, the mold is cooled by the mold cooling system to quickly cool and shape the plastic bottle. After the plastic bottle is cooled and shaped, the mold is opened and the formed plastic bottle is taken out. The taken out plastic bottle may have some flash, burrs, etc., which need to be subsequently trimmed.

[0004] In the prior art, when the preform is inflated, the stretching rod pushes the bottom of the preform slowly downward against it. Since the preform is heated, there is a small probability that the stretching rod will push the bottom of the preform out, causing certain defects. Especially for plastic bottles with a thinner thickness and a larger diameter, the stretching rod pushes the bottom of the preform, which may cause some defects in the processed plastic bottles. Summary of the invention

[0005] To overcome the above-mentioned defects, the embodiments of the present disclosure provide a plastic bottle blow molding device and method, which solves the technical problem in the prior art that when blow-molding plastic bottles with thin thickness and large diameter, the stretching rod pushes the bottom of the bottle blank, which may cause slight defects in the plastic bottle.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a plastic bottle blow molding device for blow molding a bottle blank into a plastic bottle, comprising: A mold, wherein the mold has a mold cavity, the mold cavity has a cavity opening, and the bottom of the mold cavity has a receiving groove; A stretching rod, which is movably arranged and passes through the cavity opening after movement to extend into the mold cavity; A movable support, which is movably arranged in the mold cavity, moves downward and then moves into the receiving groove, and a bottle clamping interval for clamping the bottom of the plastic bottle is formed between the movable support and the stretching rod; A first elastic member, wherein one end of the first elastic member acts on the mold and the other end of the first elastic member acts on the movable support to provide a force for the movable support to move upward and approach the stretching rod.

[0007] For example, in at least one embodiment of the present disclosure, a plastic bottle blow molding device is provided, wherein when the movable support is located in the receiving groove, the upper surface thereof is flush with the inner wall of the bottom of the mold cavity.

[0008] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, wherein the stretch rod has a plurality of evenly distributed slide grooves at one end close to the movable support, and the inner wall of the end of the slide groove gradually shrinks to form an exposed opening, and further comprises: A top ball, the top ball is slidably disposed in the slide groove, and an end portion thereof extends out of the exposure opening; A second elastic member, one end of the second elastic member acts on the groove wall of the sliding groove, and the other end of the second elastic member acts on the top ball to provide a force for the top ball to press against the exposed opening.

[0009] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, wherein the stretching rod has a spherical surface at one end close to the movable support, and the movable support has a spherical groove at a position opposite to the stretching rod, and the bottle clamping gap is formed between the spherical surface and the spherical groove.

[0010] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, wherein the stretch rod has a core cavity, the core cavity has a plurality of evenly arranged connecting ports, and the connecting ports are used for ventilating air into the bottle blank.

[0011] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, further comprising: The rod sleeve is relatively slidably arranged outside the stretching rod, and after sliding down to the lowermost end of the stretching rod, it blocks all the communication ports, and after sliding upward from the lowermost end of the stretching rod, it gradually stops blocking some of the communication ports.

[0012] For example, in at least one embodiment of the present disclosure, a plastic bottle blow molding device is provided, wherein the lower end of the rod sleeve has a blocking portion, and the blocking portion is used to block the bottle mouth of the bottle blank.

[0013] For example, in at least one embodiment of the present disclosure, a plastic bottle blow molding device is provided, wherein the outer wall of the sealing portion is conical.

[0014] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, further comprising: A third elastic member, one end of which acts on the stretching rod, and the other end of which acts on the rod sleeve, provides a force for the rod sleeve to slide downward relative to the stretching rod and a force for the blocking portion to block the bottle mouth of the preform.

[0015] For example, at least one embodiment of the present disclosure provides a plastic bottle blow molding device, wherein the blocking portion has a plurality of guide grooves, and further comprises: A sliding push-opening member, wherein the sliding push-opening member is slidably disposed in the guide groove, and after sliding, slides out of the guide groove or slides into the guide groove, and when sliding into the guide groove, the outer wall is flush with the outer wall of the blocking portion, and together form a cone; A fourth elastic member, one end of which acts on the sliding push-up member, and the other end of which acts on the blocking portion, to provide a force for the sliding push-up member to slide out of the guide groove.

[0016] According to another aspect, at least one embodiment of the present disclosure provides a blow molding method, which uses the plastic bottle blow molding equipment to perform blow molding.

[0017] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, the possibility of defects at the bottom of the preform during the blow molding of the plastic bottle is significantly reduced, and the qualified rate and quality stability of the product are improved. The preform is placed in the mold cavity, the stretch rod is inserted, and the movable support clamps the bottom of the preform with the stretch rod under the action of the first elastic member. When the stretch rod continues to move, the movable support moves down to the receiving groove. Through the innovative clamping structure, the working performance of the plastic bottle blow molding equipment is optimized, and the product quality and production efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the external structure of a mold in one embodiment of the present disclosure; Figure 2 for Figure 1 A schematic diagram of the top view of the mold in the embodiment of FIG. Figure 3 for Figure 2 AA cross-sectional structure diagram; Figure 4 for Figure 3 Middle B is a schematic diagram of a partially enlarged structure; Figure 5 for Figure 3 Middle C is a schematic diagram of the partially enlarged structure; In the figure: mold-1, mold cavity-100, cavity opening-101, accommodating groove-102, stretching rod-2, sliding groove-200, exposure opening-201, spherical surface-202, core cavity-203, connecting opening-204, movable support-3, spherical groove-300, bottle clamping spacer-4, first elastic member-5, top bead-6, second elastic member-7, rod sleeve-8, blocking part-800, guide groove-801, third elastic member-9, sliding top opening member-10, fourth elastic member-11. DETAILED DESCRIPTION

[0020] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0021] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0023] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1~Figure 5 As shown, it shows a plastic bottle blow molding device in an embodiment of the present disclosure, which is used to blow-mold a bottle blank into a plastic bottle, including a mold 1, the mold 1 has a mold cavity 100, the mold cavity 100 has a cavity opening 101, and the bottom of the mold cavity 100 has a receiving groove 102; the stretching rod 2 is movably arranged, and after moving, it passes through the cavity opening 101 and extends into the mold cavity 100; the movable support 3 is movably arranged in the mold cavity 100, and after moving downward, it moves into the receiving groove 102, and a bottle clamping space 4 for clamping the bottom of the plastic bottle is formed between the movable support 3 and the stretching rod 2; one end of the first elastic member 5 acts on the mold 1, and the other end acts on the movable support 3, providing a force for the movable support 3 to move up and close to the stretching rod 2.

[0027] In the present plastic bottle blow molding equipment: the mold 1 serves as the main structure, and the mold cavity 100 inside it is used to accommodate the bottle blank for blow molding. The cavity opening 101 allows the stretching rod 2 to enter the mold cavity 100, and the receiving groove 102 at the bottom of the mold cavity 100 provides space for the movable support 3 to move downward. The stretching rod 2 can move, pass through the cavity opening 101 and extend into the mold cavity 100, and play a role in the blow molding process, and can push the bottom of the bottle blank to make the bottle blank elongate. The movable support 3 can move in the mold cavity 100, and will enter the receiving groove 102 when moving downward. The bottle clamping interval 4 between the movable support 3 and the stretching rod 2 is used to clamp the bottom of the plastic bottle. The first elastic member 5 connects the mold 1 and the movable support 3, and provides a force for the movable support 3 to move upward to the stretching rod 2.

[0028] In the actual blow molding process, for example, after the preform is placed in the mold cavity 100, the stretch rod 2 moves and extends into the mold cavity 100. Since the stretch rod in the prior art directly pushes the bottom of the preform and may cause defects, in this design, the movable support 3 first clamps the bottom of the preform together with the stretch rod 2 under the action of the first elastic member 5, and as the stretch rod 2 moves further, the movable support 3 moves down to the receiving groove 102, achieving stable clamping and stretching of the bottom of the preform, reducing the probability of defects.

[0029] The advantages of this design are: first, by clamping the movable support 3 and the stretching rod 2, the defects that may be caused by the stretching rod 2 acting alone on the bottom of the bottle blank are reduced, thereby improving the product quality. Second, the structure is simple and easy to implement and maintain.

[0030] For example, when processing plastic bottles with thin thickness and large diameter, it can effectively ensure that the force on the bottom of the bottle is uniform, thereby improving the success rate of blow molding and product quality.

[0031] In terms of technical effects, the possibility of defects at the bottom of the preform during the blow molding of the plastic bottle is significantly reduced, and the qualified rate and quality stability of the product are improved. Overall working principle: the preform is placed in the mold cavity 100, the stretching rod 2 is inserted, and the movable support 3 clamps the bottom of the preform with the stretching rod 2 under the action of the first elastic member 5. When the stretching rod 2 continues to move, the movable support 3 moves down to the receiving groove 102. Overall technical effect: Through the innovative clamping structure, the working performance of the plastic bottle blow molding equipment is optimized, and the product quality and production efficiency are improved.

[0032] In some examples, such as Figure 3 As shown, the upper surface of the movable support 3 constitutes the inner wall of the bottom of the mold cavity 100 , so that when the movable support 3 moves down to the lower end and is located in the receiving groove 102 , its upper surface is flush with the inner wall of the bottom of the mold cavity 100 .

[0033] In the present plastic bottle blow molding device: the upper surface of the movable support 3 constitutes the inner wall of the bottom of the mold cavity 100, which means that when the movable support 3 moves down to the lowest end, it can be completely flush with the inner wall of the mold cavity 100, so that the shape of the mold cavity 100 will not be affected by the shape of the movable support 3. The advantage of this design is that it eliminates the adverse effects that may be caused by the height difference between the movable support 3 and the inner wall of the mold cavity 100, making the entire blow molding process more stable and reliable.

[0034] For example, when producing plastic bottles with high requirements on appearance and dimensional accuracy, the consistency and quality of the products can be effectively guaranteed. The flush design of the movable support 3 and the inner wall of the mold cavity 100 improves the structure of the equipment and improves the effect and stability of the blow molding of the plastic bottles.

[0035] In some examples, such as Figure 5 As shown, the stretching rod 2 has a plurality of evenly distributed slide grooves 200 at one end close to the movable support 3, and the inner wall of the end of the slide groove 200 gradually shrinks to form an exposed opening 201, and also includes a top ball 6, which is slidably arranged in the slide groove 200, and the end of the top ball 6 extends out of the exposed opening 201; one end of the second elastic member 7 acts on the groove wall of the slide groove 200, and the other end acts on the top ball 6, providing a force for the top ball 6 to press against the exposed opening 201.

[0036] In the plastic bottle blow molding device: a plurality of evenly distributed chute grooves 200 are arranged at one end of the stretching rod 2 close to the movable support 3, and the inner wall of the end of the chute groove 200 is narrowed to form an exposed opening 201. The top ball 6 can slide in the chute groove 200, and its end extends out of the exposed opening 201. One end of the second elastic member 7 is connected to the groove wall of the chute 200, and the other end is connected to the top ball 6, so as to provide the top ball 6 with a force to press against the exposed opening 201.

[0037] In actual blow molding operations, for example, when the stretching rod 2 and the movable support 3 jointly clamp the bottom of the bottle blank, the top bead 6, under the action of the second elastic member 7, presses against the exposed opening 201, which can increase the contact friction with the bottom of the bottle blank, making the clamping more stable and preventing the bottle blank from sliding or deflecting during the stretching and blow molding process.

[0038] The advantages of this design are: first, the cooperation between the top bead 6 and the second elastic member 7 enhances the clamping stability of the bottom of the preform, thereby improving the precision and quality of blow molding. Second, the evenly distributed top bead 6 can make the clamping force more evenly distributed on the bottom of the preform, further reducing the defects caused by uneven local force.

[0039] For example, in the high-speed and continuous blow molding production process, it can effectively ensure that the clamping effect of each bottle blank is stable and consistent, thereby reducing the defective rate.

[0040] In terms of technical effects, the stability and uniformity of bottle blank clamping are significantly improved, and the blow molding effect and product quality are optimized. Overall working principle: When the stretching rod 2 and the moving support 3 clamp the bottom of the bottle blank, the top bead 6 presses the bottom of the bottle blank under the action of the second elastic member 7 to enhance the clamping effect. Overall technical effect: Through the setting of the top bead 6 and the second elastic member 7, the clamping function of the stretching rod 2 and the moving support 3 is further improved, and the working performance and product quality stability of the plastic bottle blow molding equipment are improved.

[0041] In some examples, such as Figure 3 , Figure 5 As shown, one end of the stretching rod 2 close to the movable support 3 has a spherical surface 202 , and the movable support 3 has a spherical groove 300 at a position opposite to the stretching rod 2 , and a bottle clamping interval 4 is formed between the spherical surface 202 and the spherical groove 300 .

[0042] In the plastic bottle blow molding device: the end of the stretch rod 2 close to the movable support 3 has a spherical surface 202, the movable support 3 has a spherical groove 300 at the position corresponding to the stretch rod 2, and a bottle clamping interval 4 is formed between the spherical surface 202 and the spherical groove 300.

[0043] In the actual blow molding process, for example, when the stretching rod 2 and the movable support 3 clamp the bottom of the preform, the design of the spherical surface 202 and the spherical groove 300 has the following advantages. The spherical structure allows the clamping force to be more evenly distributed on the circumference of the bottom of the preform, avoiding the situation where the local clamping force is too large or too small. Moreover, during the clamping and stretching action, the spherical contact can better adapt to the possible slight deformation or unevenness of the bottom of the preform, thereby providing a more stable and reliable clamping effect.

[0044] The advantages of this design are: first, the spherical contact surface can achieve a more uniform clamping force distribution, reducing the deformation or damage of the preform due to uneven force during the clamping process. Second, it improves the adaptability of the equipment to preforms of different shapes and sizes, and reduces the requirements for the precision of the preforms.

[0045] For example, when producing plastic bottles of various specifications, a good clamping effect can be achieved without frequently adjusting the position and parameters of the clamping components, thereby improving production efficiency and consistency of product quality.

[0046] In terms of technical effects, the uniformity and adaptability of the clamping at the bottom of the preform are significantly improved, the scrap rate is reduced, and the success rate of blow molding and product quality are improved.

[0047] Overall working principle: through the cooperation of the spherical surface 202 and the spherical groove 300, the bottom of the bottle blank is clamped evenly, stably and adaptively in the bottle clamping interval 4. Overall technical effect: the clamping structure is optimized, the versatility and stability of the plastic bottle blow molding equipment are enhanced, and the product quality and production efficiency are improved.

[0048] In some examples, such as Figure 4 As shown, the stretching rod 2 has a core cavity 203, and the core cavity 203 has a plurality of evenly arranged communication ports 204, and the communication ports 204 are used for ventilating air into the bottle blank.

[0049] In the present plastic bottle blow molding device: a core cavity 203 is provided inside the stretch rod 2, and a plurality of evenly arranged communication ports 204 are provided on the core cavity 203. In the actual blow molding operation, for example, when the preform is placed in the mold, after the stretch rod 2 is moved into position, the compressed gas can pass through the core cavity 203 and evenly flow into the preform from the communication ports 204. This design enables the gas to evenly act on the inner wall of the preform, causing the preform to evenly expand and fit the mold cavity.

[0050] The advantages of this design are: first, the uniformity of the gas filling inside the preform is ensured by the evenly distributed connecting ports 204, thereby improving the quality of the plastic bottle molding and the uniformity of the wall thickness. Second, the ventilation structure is integrated inside the stretching rod 2, which simplifies the equipment structure and reduces the leakage and complex layout problems that may be caused by the external pipeline connection.

[0051] For example, when producing plastic bottles with high precision requirements, it can effectively avoid excessive differences in local wall thickness caused by uneven inflation, thereby improving the product's qualification rate and performance.

[0052] In terms of technical effects, the uniformity and stability of the inflation inside the preform are significantly improved, and the molding quality of the plastic bottle is optimized. Overall working principle: After the compressed gas enters the core cavity 203, it is blown out from the evenly arranged connecting ports 204, acting evenly on the inside of the preform to achieve uniform expansion of the preform. Overall technical effect: By setting a ventilation structure in the stretching rod 2, the effect of plastic bottle blow molding and the reliability of the equipment are improved.

[0053] In some examples, such as Figure 3 , Figure 4 As shown, it also includes a rod sleeve 8, which is relatively slidably arranged outside the stretching rod 2. After sliding down to the lower end of the stretching rod 2, it blocks all the connecting ports 204. After sliding upward from the lower end of the stretching rod 2, it gradually stops blocking some connecting ports 204.

[0054] In the present plastic bottle blow molding device, a rod sleeve 8 is provided, which can slide relative to the stretching rod 2. In the initial state, the rod sleeve 8 slides down to the lowest end of the stretching rod 2, and can completely block all the communication ports 204. When the rod sleeve 8 slides upward from the lowest end of the stretching rod 2, the blocking of some of the communication ports 204 will be gradually eliminated.

[0055] In the actual blow molding process, for example, when the stretch rod 2 has not reached the designated position or ventilation is not required, the rod cover 8 slides down to block the communication port 204 to prevent gas from entering the preform too early. When the stretch rod 2 is in place and ventilation is required, the rod cover 8 slides up to gradually expose the communication port 204, so that gas can enter the interior of the preform as required.

[0056] The advantages of this design are: first, it can achieve precise control of ventilation timing and ventilation volume, improving the controllability and stability of the blow molding process; second, it can avoid disorderly leakage and waste of gas, improve gas utilization efficiency, and reduce production costs.

[0057] For example, when producing plastic bottles of different specifications and shapes, the sliding position and time of the rod sleeve 8 can be flexibly adjusted according to specific process requirements to ensure the consistency and high quality of the blow molding effect.

[0058] In terms of technical effects, the controllability and energy saving of the ventilation link in the blow molding process are significantly enhanced, and the production process is optimized. Overall working principle: According to the blow molding process, the ventilation state of the connecting port 204 is timely controlled by sliding the rod sleeve 8 up and down. Overall technical effect: Through the cooperation of the rod sleeve 8 and the stretching rod 2, the ventilation control mechanism is improved, and the production efficiency and product quality of the plastic bottle blow molding equipment are improved.

[0059] In some examples, such as Figure 4 As shown, the lower end of the rod sleeve 8 has a blocking portion 800, and the blocking portion 800 is used to block the bottle mouth of the bottle blank.

[0060] In the plastic bottle blow molding device: a sealing portion 800 is provided at the lower end of the rod sleeve 8, and the sealing portion 800 is used to seal the bottle mouth of the bottle blank during the blow molding process.

[0061] In actual operation, for example, when the preform is placed in the mold, after the stretching rod 2 and the rod sleeve 8 are moved into place, the sealing portion 800 can effectively seal the mouth of the preform to prevent gas leakage from the mouth of the bottle, thereby ensuring that the blowing gas can fully act inside the preform and make the preform expand evenly according to the shape of the mold cavity.

[0062] The advantages of this design are: first, it ensures the tightness of the gas during the blow molding process, improves the efficiency of gas utilization, and helps to uniformly shape the preform. Second, it avoids problems such as uneven blow molding and bottle body defects that may be caused by bottle mouth leakage, thereby improving product quality and pass rate.

[0063] For example, in high-speed and continuous blow molding production, the sealing effect of the bottle mouth can be stably maintained, ensuring that the blow molding quality of each plastic bottle is stable and reliable.

[0064] In terms of technical effects, the sealing performance of the bottle mouth during the blow molding process is significantly enhanced, and the molding quality and consistency of the plastic bottle are improved. Overall working principle: the rod sleeve 8 moves, and the sealing part 800 at its lower end fits tightly against the bottle mouth to achieve sealing. Overall technical effect: Through the setting of the sealing part 800, the sealing mechanism during the blow molding process is improved, and the performance and product quality of the plastic bottle blow molding equipment are improved.

[0065] In some examples, such as Figure 4 As shown, the outer wall of the blocking portion 800 is tapered.

[0066] In the actual blow molding process, for example, when the rod sleeve 8 moves downward and the sealing portion 800 contacts and seals the bottle mouth of the preform, the tapered outer wall can play a good guiding role, making the sealing more accurate and tight.

[0067] The advantages of this design are: first, the tapered outer wall is easy to align with the bottle mouth, which improves the efficiency and accuracy of the plugging. Second, when the tapered structure contacts the bottle mouth, it can increase the contact area, improve the sealing effect, and reduce the possibility of gas leakage.

[0068] For example, in a fast production rhythm, the bottle mouth can be sealed quickly and effectively to ensure the smooth progress of the blow molding work.

[0069] In terms of technical effects, the alignment speed and sealing performance of the plugging part 800 and the bottle mouth are significantly improved, and the blow molding process is optimized. Overall working principle: Since the outer wall of the plugging part 800 is conical, it can naturally guide the alignment when approaching the bottle mouth to achieve tight sealing. Overall technical effect: Through the conical design, the functionality of the plugging part 800 is enhanced, and the working efficiency and product quality of the plastic bottle blow molding equipment are improved.

[0070] In some examples, such as Figure 4 As shown, it also includes a third elastic member 9, one end of the third elastic member 9 acts on the stretching rod 2, and the other end acts on the rod sleeve 8, providing a force for the rod sleeve 8 to slide down relative to the stretching rod 2 and a force for the sealing part 800 to block the bottle mouth of the bottle blank.

[0071] In actual operation, for example, when the stretching rod 2 and the rod sleeve 8 are ready to operate the preform, the force provided by the third elastic member 9 causes the rod sleeve 8 to slide down relative to the stretching rod 2 and ensures that the blocking portion 800 can effectively block the mouth of the preform during the sliding movement.

[0072] The advantages of this design are: first, the elastic force of the third elastic member 9 is used to realize the automatic sliding and blocking action of the rod sleeve 8, thereby improving the convenience and efficiency of operation; second, it can ensure that there is a stable and sufficient blocking force between the blocking portion 800 and the bottle mouth of the preform, thereby enhancing the sealing effect.

[0073] For example, in a continuous production process, even if there is a certain position deviation or vibration, the third elastic member 9 can ensure the reliability of the sealing.

[0074] In terms of technical effects, the accuracy and stability of the rod sleeve 8 sliding down and blocking are significantly improved, and the sealing performance during the blow molding process is optimized. Overall working principle: The third elastic member 9 applies elastic force to drive the rod sleeve 8 to slide down, so that the blocking part 800 blocks the bottle mouth of the preform. Overall technical effect: Through the action of the third elastic member 9, the blocking function of the rod sleeve 8 is improved, and the reliability and product quality of the plastic bottle blow molding equipment are improved.

[0075] In some examples, such as Figure 4 As shown, the blocking portion 800 has a plurality of guide grooves 801 and also includes a sliding top opening member 10, which is slidably arranged in the guide groove 801, and slides out of the guide groove 801 or slides into the guide groove 801 after sliding, and when sliding into the guide groove 801, the outer wall is flush with the outer wall of the blocking portion 800, and together form a cone; one end of the fourth elastic member 11 acts on the sliding top opening member 10, and the other end acts on the blocking portion 800, providing a force for the sliding top opening member 10 to slide out of the guide groove 801.

[0076] In the present plastic bottle blow molding device: the plugging portion 800 has a plurality of guide grooves 801, and the sliding push-opening member 10 is slidably arranged in the guide grooves 801 and the end thereof slides out of the guide grooves 801. In actual operation, for example, when the plugging portion 800 of the rod sleeve 8 contacts the mouth of the bottle blank, the sliding push-opening member 10 slides back into the guide groove 801 under the action of the mouth of the bottle blank, which can better adapt to the shape and size of the mouth of the bottle, and further enhance the sealing performance of the plugging. When the blow molding is completed and the plastic bottle needs to be taken out, the fourth elastic member 11 acts to make the sliding push-opening member 10 slide out of the guide groove 801, so that the plugging portion 800 can be well separated from the mouth of the bottle.

[0077] The advantages of this design are: first, the adaptive sliding of the sliding push-opening member 10 improves the adaptability to different bottle mouth sizes and shapes, ensuring a good blocking effect; second, it is easy to remove the blockage smoothly after the blow molding is completed, thereby improving production efficiency.

[0078] For example, when faced with a bottle blank with a certain manufacturing error in the bottle mouth, effective sealing and smooth demoulding operations can still be achieved.

[0079] In terms of technical effects, the adaptability and operational convenience of the blocking part 800 are significantly improved, and the overall process of blow molding is optimized. Overall working principle: When contacting the bottle mouth, the sliding top opening member 10 enhances the blockage under the action of the fourth elastic member 11; after the blow molding is completed, the fourth elastic member 11 can also make the sliding top opening member 10 slide back to the guide groove 801 to release the blockage. Overall technical effect: Through the cooperation of the sliding top opening member 10 and the fourth elastic member 11, the function of the blocking part 800 is enhanced, and the performance and flexibility of the plastic bottle blow molding equipment are improved.

[0080] This embodiment also proposes a blow molding method, and the blow molding is performed using the above-mentioned plastic bottle blow molding equipment. In actual operation, the bottle blank is first placed in the mold cavity 100 of the mold 1, and the mold 1 is closed. The stretch rod 2 moves through the cavity 101 and extends into the mold cavity 100, and the movable support 3 clamps the bottom of the bottle blank together with the stretch rod 2 under the action of the first elastic member 5. Then, the rod sleeve 8 slides down, and its blocking part 800 blocks the bottle mouth of the bottle blank. At the same time, the sliding of the rod sleeve 8 controls the ventilation state of the connecting port 204 of the core cavity 203 of the stretch rod 2. During the blow molding process, compressed air is introduced into the bottle blank to expand it and cling to the inner wall of the mold cavity 100. At the same time, the cooling system of the mold 1 cools the mold 1, so that the plastic bottle is quickly cooled and shaped. Finally, the mold 1 is opened and the molded plastic bottle is taken out.

[0081] The advantages of this method are: first, it gives full play to the synergy of various parts of the equipment, ensuring the stability and efficiency of the blow molding process. Second, it can effectively avoid defects in the preform during the blow molding process, improve product quality and pass rate. For example, in large-scale production, high-quality plastic bottles can be stably produced to meet market demand.

[0082] In terms of technical effects, high-quality and high-efficiency blow molding of plastic bottles is achieved. Overall working principle: According to the working process of the equipment, the operations of preform placement, clamping, blocking, ventilation, blow molding, cooling and demoulding are carried out in sequence to complete the blow molding of plastic bottles. Overall technical effect: By using specific equipment, the blow molding method is optimized, and the production efficiency and product quality are improved.

[0083] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A plastic bottle blow molding device, used for blow molding a preform into a plastic bottle, characterized in that: include: A mold (1), the mold (1) having a mold cavity (100), the mold cavity (100) having a cavity opening (101), and the bottom of the mold cavity (100) having a receiving groove (102); A stretching rod (2), the stretching rod (2) being movably arranged and, after moving, passing through the cavity opening (101) and extending into the mold cavity (100); A movable support (3), the movable support (3) being movably disposed in the mold cavity (100), and moving downward and then into the receiving groove (102), wherein a bottle clamping space (4) for clamping the bottom of the plastic bottle is formed between the movable support (3) and the stretching rod (2); A first elastic member (5), wherein one end of the first elastic member (5) acts on the mold (1) and the other end acts on the movable support (3), providing a force for the movable support (3) to move upward and approach the stretching rod (2).

2. A plastic bottle blow molding device according to claim 1, characterized in that: When the movable support (3) is located in the accommodating groove (102), its upper surface is flush with the inner wall of the bottom of the mold cavity (100).

3. A plastic bottle blow molding device according to claim 2, characterized in that: The stretching rod (2) has a plurality of evenly distributed slide grooves (200) at one end close to the movable support (3), and the inner wall of the end of the slide groove (200) is gradually narrowed to form an exposed opening (201), and further comprises: A top ball (6), the top ball (6) being slidably disposed in the slide groove (200) and having an end extending out of the exposure opening (201); A second elastic member (7), one end of the second elastic member (7) acts on the groove wall of the slide groove (200), and the other end of the second elastic member (7) acts on the top bead (6) to provide a force for the top bead (6) to press against the exposure opening (201).

4. A plastic bottle blow molding device according to claim 3, characterized in that: One end of the stretching rod (2) close to the movable support (3) has a spherical surface (202), and a position of the movable support (3) opposite to the stretching rod (2) has a spherical groove (300), and the bottle clamping spacer (4) is formed between the spherical surface (202) and the spherical groove (300).

5. The plastic bottle blow molding equipment according to claim 1, characterized in that: The stretching rod (2) has a core cavity (203), the core cavity (203) has a plurality of evenly arranged communication ports (204), and the communication ports (204) are used for ventilating air into the bottle blank.

6. A plastic bottle blow molding device according to claim 5, characterized in that: Also includes: A rod sleeve (8) is relatively slidably arranged outside the stretching rod (2), and after sliding down to the lowermost end of the stretching rod (2), blocks all of the communication openings (204), and after sliding upward from the lowermost end of the stretching rod (2), gradually stops blocking some of the communication openings (204).

7. A plastic bottle blow molding device according to claim 6, characterized in that: The lower end of the rod sleeve (8) is provided with a blocking portion (800), the blocking portion (800) being used to block the bottle mouth of the bottle blank, and the outer wall of the blocking portion (800) is conical.

8. The plastic bottle blow molding equipment according to claim 7, characterized in that: Also includes: A third elastic member (9), one end of the third elastic member (9) acts on the stretching rod (2), and the other end of the third elastic member (9) acts on the rod sleeve (8), providing a force for the rod sleeve (8) to slide downward relative to the stretching rod (2) and a force for the sealing portion (800) to block the bottle mouth of the preform.

9. The plastic bottle blow molding equipment according to claim 7, characterized in that: The blocking portion (800) has a plurality of guide grooves (801) and further comprises: A sliding push-opening member (10), wherein the sliding push-opening member (10) is slidably disposed in the guide groove (801), and after sliding out of the guide groove (801) or into the guide groove (801), and when sliding into the guide groove (801), the outer wall is flush with the outer wall of the blocking portion (800), and together they form a cone; A fourth elastic member (11), one end of the fourth elastic member (11) acts on the sliding push-up member (10), and the other end of the fourth elastic member (11) acts on the blocking portion (800), providing a force for the sliding push-up member (10) to slide out of the guide groove (801).

10. A blow molding method, characterized in that: Blow molding is performed using a plastic bottle blow molding device as described in any one of claims 1 to 9.

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