Blow molding apparatus for plastic article production

Abstract

The application belongs to the technical field of blow molding equipment, and particularly relates to a blow molding equipment for plastic product production, which comprises a supporting frame, a guide rod, a transplanting driving component, a sliding seat, a supporting guide rod, an opening and closing mold cylinder, a first forming mold, a second forming mold, a mounting platform, a material injection component and a pipe inserting and blowing component. In the application, the transplanting driving component drives the first forming mold and the second forming mold to move below the material injection component, and then the material injection component extrudes a tubular plastic embryo downwards. After the material injection is completed, the opening and closing mold cylinder drives the first forming mold and the second forming mold to close, the embryo is cut off and sealed in the process of closing, the transplanting driving component continues to drive to move below the pipe inserting and blowing component, the pipe inserting and blowing component is inserted into the embryo and blows air, and the embryo is inflated and formed in the mold forming cavity. Through the multi-station collaborative operation, the application realizes the automatic and continuous operation of material injection, mold closing, air blowing forming and mold opening and part taking, and effectively improves the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of blow molding equipment technology, specifically a blow molding equipment for producing plastic products. Background Technology

[0002] In the production and processing of plastic products, blow molding is a commonly used process. It mainly involves extruding molten plastic raw materials into a tubular preform, then sealing the preform with a mold, and introducing compressed air into the preform to make it expand and fit against the inner wall of the mold cavity. After cooling and solidification, the desired plastic product is obtained.

[0003] Currently, existing blow molding equipment often suffers from insufficient production continuity and low automation in practical production applications. For example, the connection between processes such as material injection, mold closing, blow molding, and mold opening and part removal is not smooth enough in some equipment, requiring more manual intervention or equipment waiting time, resulting in low overall production efficiency. At the same time, when the mold is closed to cut and seal the preform, traditional cutting and sealing structures may result in incomplete cutting of the preform and incomplete sealing, affecting the molding quality and pass rate of the product.

[0004] Furthermore, during the insertion of the blowing component into the preform, gaps can easily form on its surface. If these gaps are not effectively sealed, air leakage can occur during the blowing process, affecting the molding effect and structural strength of the plastic product. Moreover, for molded products, some equipment does not allow for convenient removal after mold opening, potentially requiring manual assistance, further increasing production cycles and labor costs. These issues, to some extent, limit the production capacity and product quality of blow molding equipment, making it difficult to meet the demands of modern large-scale plastic product manufacturing. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a blow molding equipment for producing plastic products. This invention primarily addresses the problems of insufficient production continuity and low automation in existing blow molding equipment.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: This invention provides a blow molding equipment for producing plastic products, including a support frame, guide rods, a transfer drive component, a sliding seat, a support guide rod, an opening and closing cylinder, a first molding die, a second molding die, an installation platform, an injection component, and an insert blowing component; two symmetrically arranged support frames are fixedly connected by two sets of guide rods; each set of guide rods has a sliding seat slidably connected to it; two sliding seats are fixedly connected by multiple support guide rods; the first molding die and the second molding die are slidably connected to the support guide rods; the first molding die and the second molding die are combined... A closed mold forming cavity is formed after molding; an opening and closing cylinder is provided between the first molding mold and its side sliding seat, and between the second molding mold and its side sliding seat; a transfer driving component is provided between the two support frames along the direction of the guide rod; the transfer driving component is used to drive the sliding seat to move; the upper end of the support frame is fixedly connected to the mounting platform; an injection component and an insert blowing component are arranged sequentially at intervals along the length direction on the mounting platform; the injection component is used to extrude a tubular plastic preform into the mold forming cavity formed by the first molding mold and the second molding mold; the insert blowing component is used to insert air into the preform and blow it to expand for molding.

[0007] During operation, the transfer drive component moves the sliding seat along the guide rod, moving the first and second molding dies below the injection component. The injection component then extrudes a tubular plastic preform downwards. After injection, the mold-closing cylinder drives the first and second molding dies to close, forming a closed molding cavity. During mold closing, the preform is cut and sealed at both ends. The transfer drive component continues to move the sliding seat, moving the molding cavity containing the plastic preform below the air-blowing component. The air-blowing component inserts into the preform and blows air, causing the preform to expand and solidify within the molding cavity. After molding, the mold-closing cylinder drives the first and second molding dies to open, allowing the molded plastic product to be removed. This solution, through multi-station collaborative operation, achieves automated continuous operation of injection, mold closing, air-blowing molding, and mold opening and part removal, effectively improving production efficiency. Meanwhile, the transfer drive component drives the mold to move precisely along the guide rod, and the opening and closing cylinders provide stable drive for the first and second molding molds, ensuring the accuracy and stability of the connection between each process, reducing manual intervention, and helping to ensure the consistency of the molding quality of plastic products.

[0008] Preferably, a fixed cutting block is fixedly connected to the upper surface of both the first molding mold and the second molding mold; the inner cavity of the fixed cutting block includes a semi-cylindrical surface at the lower end and a semi-circular end face at the upper end.

[0009] During operation, as the mold-opening and closing cylinder drives the first and second molding molds to approach each other, the two fixed cutting blocks come into contact with each other. The semi-cylindrical surfaces of the two fixed cutting blocks together form a cylindrical cavity that fits the outer wall of the tubular plastic preform. The semi-circular end faces together form a planar structure. At the same time, during the mold closing process, the semi-circular end faces squeeze each other to cut off the upper end of the preform, thereby sealing the upper end of the preform and ensuring that there is no air leakage during the blow molding process. This improves the sealing of the preform and the neatness of the cut.

[0010] Preferably, a semi-cylindrical step surface is provided at the lower end of the semi-cylindrical surface; the thickness of the semi-cylindrical step surface is 2-2.8 mm.

[0011] The thinner semi-cylindrical stepped surface is used to indent the preform during mold closing. This indentation reduces the wall thickness of the preform at this point, resulting in a thinner wall after blow molding. This makes it easier to cut the injection port at the top of the plastic product after blow molding, facilitating quick separation of the injection port from the main body of the product and reducing the difficulty of subsequent processing steps. At the same time, controlling the wall thickness of the indented area within a reasonable range of 2-2.8 mm ensures that the preform is not easily damaged during the indentation process and that subsequent cutting is convenient, further improving production efficiency and the convenience of product processing.

[0012] Preferably, a sealing component is provided on the fixed cutting block; the sealing component is used to seal the gap created by the insertion of the tube in the blowing component. By providing a sealing component to seal the gap created by the insertion of the tube in the blowing component, gas leakage from the gap during the blowing process is prevented, ensuring that the preform can fully expand in the mold forming cavity, and guaranteeing the fullness and dimensional accuracy of the plastic product. Specifically, the sealing component can adopt an elastic sealing block or a movable insert plate structure. After the tube blowing component completes blowing and is pulled out, the sealing component automatically resets under the drive of a spring or cylinder, squeezing and sealing the gap, effectively solving the problem of air leakage in the preform caused by tube insertion in traditional blow molding equipment, and further improving the molding quality of the product.

[0013] Preferably, the sealing component includes a movable insert plate and a first cylinder; a T-slot is provided on the fixed cutting block in a direction perpendicular to the mold closing surface; the movable insert plate is slidably connected in the T-slot; the extended end of the movable insert plate is fixedly connected to the cylinder rod of the first cylinder; the cylinder body of the first cylinder is fixedly connected to the first molding mold or the second molding mold through a mounting plate; when the movable insert plate is fully extended, the two movable insert plates are in contact with each other.

[0014] During operation, after the insertion and blowing component is inserted into the preform and completes blowing, the component is pulled upwards. At this time, the first cylinder drives the movable insert plate to extend along the T-slot towards the mold closing surface. The extended ends of the two movable insert plates fit together, sealing the gap left by the insertion tube. After the plastic product cools and solidifies, the mold opening and closing cylinder drives the first and second molding molds to open. Simultaneously, the first cylinder drives the movable insert plate to retract into the T-slot, avoiding interference with the removal of the plastic product. This solution achieves automated sealing and release of the insertion tube gap through the extension and retraction of the movable insert plate driven by the first cylinder. It has a simple structure and rapid response, effectively improving the reliability and efficiency of the sealing operation.

[0015] Preferably, the intubation and blowing component includes an air blowing tube, a guide sleeve, a connecting block, and a second cylinder; the guide sleeve is fixedly connected vertically along the mounting platform; the air blowing tube is slidably connected inside the guide sleeve; one end of the connecting block is fixedly connected to the air blowing tube; the other end of the connecting block is fixedly connected to the cylinder rod of the second cylinder; and the cylinder body of the second cylinder is fixedly connected to the mounting platform.

[0016] During operation, when the mold forming cavity moves below the air-blowing tube insertion component, the cylinder rod of the second cylinder extends, pushing the connecting block to slide the air-blowing tube downwards along the guide sleeve, allowing the lower end of the air-blowing tube to insert into the tubular plastic preform. Subsequently, high-pressure gas is introduced into the preform through the air-blowing tube, causing the preform to expand within the mold forming cavity and conform to the inner wall of the mold. After the plastic product is formed, the air-blowing tube stops blowing air, the cylinder rod of the second cylinder retracts, and the air-blowing tube slides upwards along the guide sleeve and is pulled out of the preform. The guide sleeve guides the movement of the air-blowing tube, ensuring accurate insertion into the preform and preventing damage during insertion. Simultaneously, the stable drive of the second cylinder ensures the smoothness of the insertion and removal actions, further improving the reliability of the equipment operation.

[0017] Preferably, the lower ends of the first and second molding dies are provided with clamping structures; the clamping structure is a rectangular narrow groove. During operation, when the first and second molding dies are closed, the lower edge of the tubular plastic preform will be embedded in the rectangular narrow groove. The clamping force generated by the mold closing will fix the lower end of the preform, preventing the preform from shifting position or leaking air at the lower end due to internal air pressure during the blowing process, and ensuring that the preform can stably expand and form within the set molding cavity.

[0018] Preferably, the clamping structure further includes an extrusion step; the extrusion step is disposed at the upper end of the rectangular narrow groove; the thickness of the extrusion step is 2-2.8 mm. During operation, as the first molding die and the second molding die close, the extrusion step mutually extrudes the lower edge of the tubular plastic preform, thinning the edge of the preform and embedding it into the rectangular narrow groove. The thinned edge is easier to separate from the main body of the product after subsequent part removal, improving the convenience of production and the stability of product quality; moreover, the extrusion step applies additional extrusion force to the lower edge of the preform embedded in the rectangular narrow groove, causing the edge of the preform to undergo plastic deformation under the combined action of the extrusion step and the inner wall of the rectangular narrow groove, further enhancing the sealing effect and clamping stability of the lower end of the preform, effectively preventing gas leakage from the lower end of the preform during the blowing process, and ensuring that the preform can expand and form normally in the molding cavity of the mold.

[0019] Preferably, the clamping structure is disposed on the upper end face of the rotating shaft; the rotating shaft is rotatably connected to the mounting hole at the lower end of the first molding die via a bearing; a sliding block is fixedly connected to the cylindrical surface of the rotating shaft; the sliding block slides in the arc-shaped groove on the first molding die; a compression spring is disposed in the arc-shaped groove; a gear is fixedly connected to the lower end of the rotating shaft; the rack is fixedly connected to one side of the support frame along the direction of the guide rod, and the rack is tangent to the gear.

[0020] During operation, when the transfer drive component moves the sliding seat, it moves the first and second molding dies from below the injection component to below the tube blowing component. After the mold moves to below the tube blowing component and completes the blowing molding, the transfer drive component continues to move the sliding seat. During the movement, the gear and rack mesh with each other, the rack remains stationary, and the gear drives the rotating shaft to rotate in the mounting hole. The rotating shaft drives the clamping structure to rotate. During the rotation of the clamping structure, a torsional force is generated on the waste edge at the lower end of the molded plastic product, causing tearing between the waste edge and the main body of the product. This facilitates the rapid separation of the waste from the main body of the product, reduces the manual trimming process, and further improves production efficiency. When the rotating shaft rotates, it drives the sliding block to slide in the arc-shaped groove and compress the compression spring. After the transfer drive component drives the sliding seat to move in the opposite direction, the rotating shaft is reset under the rebound force of the compression spring.

[0021] Preferably, the clamping structure is also disposed on the upper end surface of the semi-cylindrical rotating body; the semi-cylindrical rotating body is rotatably connected to the semi-cylindrical hole at the lower end of the second forming mold via a cylindrical surface; a first arc groove is formed on the cylindrical surface of the semi-cylindrical rotating body; a first magnetic strip is fixedly connected in the first arc groove; a second arc groove is provided on the semi-cylindrical hole corresponding to the position of the first arc groove; a second magnetic strip is fixedly connected in the second arc groove.

[0022] During operation, after the transplanting drive component drives the sliding seat to move the second molding die to the bottom of the tube blowing component and completes the blowing molding, the semi-cylindrical rotating body continues to move and fits against the semi-cylindrical structure at the upper end of the drive shaft. As the rotating shaft rotates, it drives the semi-cylindrical rotating body to rotate synchronously within the semi-cylindrical hole. The semi-cylindrical rotating body drives the clamping structure on its upper surface to rotate, which cooperates with the clamping structure on the first molding die to apply torsional force to the waste edge at the lower end of the plastic product, further improving the tearing effect. At the same time, when the semi-cylindrical rotating body rotates, the relative positions of the first magnetic strip in the first arc groove and the second magnetic strip in the second arc groove change. The attraction between the magnetic strips assists the rotation of the semi-cylindrical rotating body, ensuring the stability of the clamping structure rotation.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. In this invention, the transfer drive component drives the sliding seat to move along the guide rod, causing the first and second molding molds to move below the injection component. The injection component then extrudes a tubular plastic preform downwards. After injection, the mold opening and closing cylinder drives the first and second molding molds to close, forming a closed mold forming cavity. During mold closing, the preform is cut and sealed at the top and bottom. The transfer drive component continues to drive the sliding seat to move the mold forming cavity containing the plastic preform to below the insert blowing component. The insert blowing component inserts into the preform and blows air, causing the preform to expand and form within the mold forming cavity. After forming, the mold opening and closing cylinder drives the first and second molding molds to open, allowing the formed plastic product to be removed. This solution, through multi-station collaborative operation, achieves automated continuous operation of injection, mold closing, blowing molding, and mold opening and part removal, effectively improving production efficiency.

[0025] 2. This invention seals the gap created by the insertion of the tube in the blow molding component by setting a sealing component, thereby preventing gas leakage from the gap during the blowing process. This ensures that the preform can fully expand within the mold forming cavity, guaranteeing the fullness and dimensional accuracy of the plastic product. Specifically, the sealing component can adopt an elastic sealing block or a movable insert plate structure. After the tube blowing component completes blowing and is pulled out, the sealing component automatically resets under the drive of a spring or cylinder, squeezing and sealing the gap. This effectively solves the problem of air leakage in the preform caused by tube insertion in traditional blow molding equipment, further improving the molding quality of the product.

[0026] 3. In this invention, when the transplanting drive component drives the sliding seat to move, it moves the first molding die and the second molding die from below the injection component to below the tube blowing component. After the die moves to below the tube blowing component and completes the blowing molding, the transplanting drive component continues to drive the sliding seat to move. During the movement, the gear and rack mesh with each other, the rack remains stationary, and the gear drives the rotating shaft to rotate in the mounting hole. The rotating shaft drives the clamping structure to rotate. During the rotation of the clamping structure, a torsional force is generated on the waste edge at the lower end of the molded plastic product, causing tearing between the waste edge and the main body of the product. This facilitates the rapid separation of the waste from the main body of the product, reduces the manual trimming process, and further improves production efficiency. When the rotating shaft rotates, it drives the sliding block to slide in the arc-shaped groove and compress the compression spring. After the transplanting drive component drives the sliding seat to move in the opposite direction, the rotating shaft is reset under the rebound force of the compression spring. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure of the blow molding equipment of the present invention from a first-view perspective;

[0029] Figure 2 This is a schematic diagram of the overall structure of the blow molding equipment of the present invention from a second perspective;

[0030] Figure 3 This is a schematic diagram of the overall structure of the blow molding equipment of the present invention from a third-person perspective;

[0031] Figure 4 This is a schematic diagram of the supporting guide rod and the mold opening and closing cylinder in this invention;

[0032] Figure 5 This is a schematic diagram of the structure of the first molding die and the second molding die in this invention;

[0033] Figure 6 This is a schematic diagram of the internal structure of the first molding die and the second molding die in this invention;

[0034] Figure 7 This is a schematic diagram of the internal structure of the first molding die in this invention;

[0035] Figure 8 This is a schematic diagram of the structure of the fixed cutting block in this invention;

[0036] Figure 9 This is a schematic diagram of the rotating shaft in this invention;

[0037] Figure 10 This is a schematic diagram of the connection between the sliding block and the compression spring in this invention;

[0038] Figure 11 This is a schematic diagram of the internal structure of the second molding die in this invention;

[0039] Figure 12 yes Figure 11 A magnified view of a section at point A in the middle;

[0040] Figure 13 This is a schematic diagram of the structure of the intubation and air blowing component in this invention;

[0041] In the diagram: 1. Support frame; 11. Guide rod; 2. Transplant drive component; 3. Sliding seat; 31. Support guide rod; 32. Mold opening and closing cylinder; 4. First forming mold; 41. Mounting hole; 5. Second forming mold; 12. Mounting platform; 6. Injection component; 7. Insertion tube and air blowing component; 71. Air blowing tube; 72. Guide sleeve; 73. Connecting block; 74. Second cylinder; 8. Fixed cutting block; 81. Semi-cylindrical surface; 82. Semi-cylindrical end face; 83. Semi-cylindrical stepped surface; 84. Sealing component; 841. Movable insert plate; 842. First cylinder; 91. Clamping structure; 911. Rectangular narrow groove; 912. Extrusion step; 92. Rotating shaft; 921. Sliding block; 93. Compression spring; 94. Gear; 95. Rack; 96. Semi-cylindrical rotating body; 97. First magnetic strip; 98. Second magnetic strip. Detailed Implementation

[0042] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0043] like Figures 1 to 5As shown, a blow molding machine for producing plastic products includes a support frame 1, guide rods 11, a transfer drive component 2, a sliding seat 3, a support guide rod 31, a mold opening and closing cylinder 32, a first molding die 4, a second molding die 5, an installation platform 12, an injection component 6, and an insert blowing component 7. Two symmetrically arranged support frames 1 are fixedly connected by two sets of guide rods 11. Each set of guide rods 11 has a sliding seat 3 slidably connected to it. Two sliding seats 3 are fixedly connected by multiple support guide rods 31. The first molding die 4 and the second molding die 5 are slidably connected to the support guide rods 31. After the first molding die 4 and the second molding die 5 are closed, a closed mold is formed. A mold forming cavity; an opening and closing cylinder 32 is provided between the first molding mold 4 and its side sliding seat 3, and between the second molding mold 5 and its side sliding seat 3; a transfer driving component 2 is provided between the two support frames 1 along the direction of the guide rod 11; the transfer driving component 2 is used to drive the sliding seat 3 to move; the upper end of the support frame 1 is fixedly connected to the mounting platform 12; an injection component 6 and an insert blowing component 7 are arranged sequentially at intervals along the length direction on the mounting platform 12; the injection component 6 is used to extrude a tubular plastic preform into the mold forming cavity formed by the first molding mold 4 and the second molding mold; the insert blowing component 7 is used to insert into the preform and blow air to expand and form it.

[0044] During operation, the transfer drive component 2 drives the sliding seat 3 to move along the guide rod 11, causing the first molding mold 4 and the second molding mold 5 to move below the injection component 6. The injection component 6 then extrudes a tubular plastic preform downwards. After injection, the mold opening and closing cylinder 32 drives the first molding mold 4 and the second molding mold 5 to close, forming a closed mold forming cavity. During the mold closing process, the preform is cut and sealed at the top and bottom. The transfer drive component 2 continues to drive the sliding seat 3 to move, moving the mold forming cavity containing the plastic preform to below the insert air blowing component 7. The insert air blowing component 7 is inserted into the preform and blows air, causing the preform to expand and form within the mold forming cavity. After forming, the mold opening and closing cylinder 32 drives the first molding mold 4 and the second molding mold 5 to open, allowing the molded plastic product to be removed. This solution, through multi-station collaborative operation, achieves automated continuous operation of injection, mold closing, air blowing molding, and mold opening and part removal, effectively improving production efficiency. Meanwhile, the transfer drive component 2 drives the mold to move precisely along the guide rod 11, and in conjunction with the mold opening and closing cylinder 32, it stably drives the first molding mold 4 and the second molding mold 5, ensuring the accuracy and stability of the connection between each process, reducing manual intervention, and helping to ensure the consistency of the molding quality of plastic products.

[0045] like Figure 5 , Figure 6 and Figure 8As shown, a fixed cutting block 8 is fixedly connected to the upper surface of both the first forming mold 4 and the second forming mold 5; the inner cavity of the fixed cutting block 8 includes a semi-cylindrical surface 81 at the lower end and a semi-circular end surface 82 at the upper end.

[0046] During operation, as the mold opening and closing cylinder 32 drives the first forming mold 4 and the second forming mold 5 to approach each other, the two fixed cutting blocks 8 are brought into contact with each other. The semi-cylindrical surfaces 81 of the two fixed cutting blocks 8 together form a cylindrical cavity that fits the outer wall of the tubular plastic preform, while the semi-circular end faces 82 together form a planar structure. At the same time, during the mold closing process, the semi-circular end faces 82 squeeze each other to cut off the upper end of the preform, thereby sealing the upper end of the preform and ensuring that there is no air leakage during the blowing molding process, thus improving the sealing of the preform and the neatness of the cut.

[0047] like Figure 8 As shown, a semi-cylindrical step surface 83 is provided at the lower end of the semi-cylindrical surface 81; the thickness of the semi-cylindrical step surface 83 is 2-2.8mm.

[0048] The thinner semi-cylindrical stepped surface 83 is used to press and depress the preform during the mold closing process. During the pressing and depressing process, the wall thickness of the preform at this point is also reduced. As a result, the wall thickness at this point is smaller after subsequent blow molding, making it easier to cut the injection port at the top of the plastic product after blow molding. This facilitates the quick separation of the injection port from the main body of the product by the operator, reducing the difficulty of subsequent processing steps. At the same time, the wall thickness of the pressed area is controlled within a reasonable range of 2-2.8mm, which not only ensures that the preform is not easily damaged during the pressing and depressing process, but also ensures the convenience of subsequent cutting, further improving production efficiency and the convenience of product processing.

[0049] like Figure 4 and Figure 5 As shown, a sealing component 84 is provided on the fixed cutting block 8; the sealing component 84 is used to seal the gap created by the insertion of the tube in the blowing component 7. By sealing the gap created by the insertion of the tube in the blowing component 7 with the sealing component 84, gas leakage from the gap during the blowing process is prevented, ensuring that the preform can fully expand in the mold forming cavity, thus guaranteeing the fullness and dimensional accuracy of the plastic product. Specifically, the sealing component 84 can adopt an elastic sealing block or a movable insert plate 841 structure. After the blowing component 7 completes blowing and is pulled out, the sealing component 84 automatically resets under the drive of a spring or cylinder, squeezing and sealing the gap, effectively solving the problem of air leakage in the preform caused by tube insertion in traditional blow molding equipment, and further improving the molding quality of the product.

[0050] like Figure 5 and Figure 6As shown, the sealing component 84 includes a movable insert plate 841 and a first cylinder 842; a T-slot is provided on the fixed cutting block 8 in a direction perpendicular to the mold closing surface; the movable insert plate 841 is slidably connected in the T-slot; the extended end of the movable insert plate 841 is fixedly connected to the cylinder rod of the first cylinder 842; the cylinder body of the first cylinder 842 is fixedly connected to the first molding mold 4 or the second molding mold 5 through a mounting plate; when the movable insert plate 841 is fully extended, the two movable insert plates 841 are in contact with each other.

[0051] During operation, after the insertion and blowing component 7 is inserted into the preform and completes the blowing, the insertion and blowing component 7 is pulled upwards. At this time, the first cylinder 842 drives the movable insert plate 841 to extend along the T-slot towards the mold closing surface. The extended ends of the two movable insert plates 841 fit together to seal the gap left by the insertion tube. After the plastic product cools and solidifies, the mold opening and closing cylinder 32 drives the first molding mold 4 and the second molding mold 5 to open. At the same time, the first cylinder 842 drives the movable insert plate 841 to retract into the T-slot, avoiding interference with the removal of the plastic product. This solution achieves automated sealing and release of the insertion tube gap by driving the extension and retraction of the movable insert plate 841 with the first cylinder 842. The structure is simple and the response is rapid, effectively improving the reliability and efficiency of the sealing operation.

[0052] like Figure 3 and Figure 13 As shown, the air blowing component 7 includes an air blowing tube 71, a guide sleeve 72, a connecting block 73, and a second cylinder 74; the guide sleeve 72 is fixedly connected vertically to the mounting platform 12; the air blowing tube 71 is slidably connected inside the guide sleeve 72; one end of the connecting block 73 is fixedly connected to the air blowing tube 71; the other end of the connecting block 73 is fixedly connected to the cylinder rod of the second cylinder 74; the cylinder body of the second cylinder 74 is fixedly connected to the mounting platform 12.

[0053] During operation, when the mold forming cavity moves below the air-blowing tube insertion component 7, the cylinder rod of the second cylinder 74 extends, pushing the connecting block 73 to drive the air-blowing tube 71 to slide downwards along the guide sleeve 72, allowing the lower end of the air-blowing tube 71 to insert into the tubular plastic preform. Subsequently, high-pressure gas is introduced into the preform through the air-blowing tube 71, causing the preform to expand within the mold forming cavity and adhere to the inner wall of the mold. After the plastic product is formed, the air-blowing tube 71 stops blowing air, the cylinder rod of the second cylinder 74 retracts, and the air-blowing tube 71 slides upwards along the guide sleeve 72 and is pulled out of the preform. The guide sleeve 72 guides the movement of the air-blowing tube 71, ensuring accurate insertion into the preform and preventing damage during insertion. Simultaneously, the stable drive of the second cylinder 74 ensures the smoothness of the insertion and removal actions, further improving the reliability of the equipment operation.

[0054] like Figure 7 and Figure 9 As shown, the first molding mold 4 and the second molding mold 5 are provided with a clamping structure 91 at their lower ends; the clamping structure 91 is a rectangular narrow groove 911. During operation, when the first molding mold 4 and the second molding mold 5 are closed, the lower edge of the tubular plastic preform will be embedded in the rectangular narrow groove 911. The clamping force generated by the mold closing will fix the lower end of the preform, preventing the preform from shifting position or leaking air at the lower end due to internal air pressure during the blowing process, and ensuring that the preform can be stably expanded and formed in the set molding cavity.

[0055] like Figure 9 As shown, the clamping structure 91 also includes an extrusion step 912; the extrusion step 912 is disposed at the upper port of the rectangular narrow groove 911; the thickness of the extrusion step 912 is 2-2.8mm. During operation, as the first molding die 4 and the second molding die 5 close, the extrusion step 912 mutually extrudes the lower edge of the tubular plastic preform, thinning the edge of the preform and embedding it into the rectangular narrow groove 911. The thinned edge is easier to separate from the main body of the product after subsequent part removal, improving the convenience of production and the stability of product quality; moreover, the extrusion step 912 will apply additional extrusion force to the lower edge of the preform embedded in the rectangular narrow groove 911, causing the edge of the preform to undergo plastic deformation under the combined action of the extrusion step 912 and the inner wall of the rectangular narrow groove 911, further enhancing the sealing effect and clamping stability of the lower end of the preform, effectively preventing gas leakage from the lower end of the preform during the blowing process, and ensuring that the preform can expand and form normally in the mold forming cavity.

[0056] like Figure 3 , Figure 9 and Figure 10 As shown, the clamping structure 91 is disposed on the upper end face of the rotating shaft 92; the rotating shaft 92 is rotatably connected to the mounting hole 41 at the lower end of the first molding mold 4 via a bearing; a sliding block 921 is fixedly connected to the cylindrical surface of the rotating shaft 92; the sliding block 921 slides in the arc-shaped groove on the first molding mold 4; a compression spring 93 is disposed in the arc-shaped groove; a gear 94 is fixedly connected to the lower end of the rotating shaft 92; a rack 95 is fixedly connected to one side of the support frame 1 along the direction of the guide rod 11, and the rack 95 is tangent to the gear 94.

[0057] During operation, when the transfer drive component 2 drives the sliding seat 3 to move, it moves the first molding mold 4 and the second molding mold 5 from below the injection component 6 to below the insertion tube blowing component 7. After the mold moves to below the insertion tube blowing component 7 and completes the blowing molding, the transfer drive component 2 continues to drive the sliding seat 3 to move. During the movement, the gear 94 and the rack 95 mesh with each other, and the rack 95 remains fixed. This drives the gear 94 to drive the rotating shaft 92 to rotate in the mounting hole 41. The rotating shaft 92 drives the clamping structure 91 to rotate. During the rotation of the clamping structure 91, a torsional force is generated on the waste edge at the lower end of the molded plastic product, causing a tear between the waste edge and the main body of the product. This facilitates the rapid separation of the waste from the main body of the product, reduces the manual trimming process, and further improves production efficiency. When the rotating shaft 92 rotates, it drives the sliding block 921 to slide in the arc-shaped groove and compress the compression spring 93. After the transfer drive component 2 drives the sliding seat 3 to move in the opposite direction, the rotating shaft 92 is reset under the rebound force of the compression spring 93.

[0058] like Figure 11 and Figure 12 As shown, the clamping structure 91 is also disposed on the upper end surface of the semi-cylindrical rotating body 96; the semi-cylindrical rotating body 96 is rotatably connected to the semi-cylindrical hole at the lower end of the second forming mold 5 through the cylindrical surface; a first arc groove is formed on the cylindrical surface of the semi-cylindrical rotating body 96; a first magnetic strip 97 is fixedly connected in the first arc groove; a second arc groove is provided on the semi-cylindrical hole corresponding to the position of the first arc groove; a second magnetic strip 98 is fixedly connected in the second arc groove.

[0059] During operation, when the transplanting drive component 2 drives the sliding seat 3 to move the second molding mold 5 to below the tube blowing component 7 and completes the blowing molding, during the continued movement, the semi-cylindrical rotating body 96 fits against the semi-cylindrical structure at the upper end of the drive shaft. As the rotating shaft 92 rotates, it drives the semi-cylindrical rotating body 96 to rotate synchronously in the semi-cylindrical hole. The semi-cylindrical rotating body 96 drives the clamping structure 91 on its upper end surface to rotate, which cooperates with the clamping structure 91 on the first molding mold 4 to apply torsional force to the waste edge at the lower end of the plastic product, further improving the tearing effect. At the same time, when the semi-cylindrical rotating body 96 rotates, the relative positions of the first magnetic strip 97 in the first arc groove and the second magnetic strip 98 in the second arc groove change. The attraction between the magnetic strips assists the rotation of the semi-cylindrical rotating body 96, ensuring the stability of the rotation of the clamping structure 91.

[0060] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A blow molding equipment for producing plastic products, characterized in that: The system includes a support frame (1), guide rods (11), a transplanting drive component (2), a sliding seat (3), a support guide rod (31), a mold opening and closing cylinder (32), a first molding die (4), a second molding die (5), an installation platform (12), an injection component (6), and a tube-inserting air blowing component (7). The two symmetrically arranged support frames (1) are fixedly connected by two sets of guide rods (11). Each set of guide rods (11) is slidably connected to a sliding seat (3). The two sliding seats (3) are fixedly connected by multiple support guide rods (31). The first molding die (4) and the second molding die (5) are slidably connected to the support guide rods (31). After the first molding die (4) and the second molding die (5) are closed, a closed mold forming cavity is formed. A mold opening and closing cylinder (32) is provided between the first molding mold (4) and its side sliding seat (3) and between the second molding mold (5) and its side sliding seat (3); a transfer drive component (2) is provided between the two support frames (1) along the direction of the guide rod (11); the transfer drive component (2) is used to drive the sliding seat (3) to move; the upper end of the support frame (1) is fixedly connected to the mounting platform (12); an injection component (6) and an insert air blowing component (7) are arranged sequentially at intervals along the length direction on the mounting platform (12); the injection component (6) is used to extrude a tubular plastic preform into the mold forming cavity formed by the first molding mold (4) and the second molding mold; the insert air blowing component (7) is used to insert into the preform and blow air to expand and form it; A fixed cutting block (8) is fixedly connected to the upper surface of both the first molding mold (4) and the second molding mold (5); the inner cavity of the fixed cutting block (8) includes a semi-cylindrical surface (81) at the lower end and a semi-circular end surface (82) at the upper end; A sealing component (84) is provided on the fixed cutting block (8); the sealing component (84) is used to seal the gap generated by the insertion of the tube in the tube blowing component (7); The first molding die (4) and the second molding die (5) are provided with a clamping structure (91) at their lower ends; the clamping structure (91) is a rectangular narrow groove (911); The clamping structure (91) further includes an extrusion step (912); the extrusion step (912) is disposed at the upper port of the rectangular narrow groove (911); the thickness of the extrusion step (912) is 2-2.8 mm; The clamping structure (91) is disposed on the upper end face of the rotating shaft (92); the rotating shaft (92) is rotatably connected to the mounting hole (41) at the lower end of the first molding mold (4) through a bearing; a sliding block (921) is fixedly connected to the cylindrical surface of the rotating shaft (92); the sliding block (921) slides in the arc groove on the first molding mold (4); a compression spring (93) is disposed in the arc groove; a gear (94) is fixedly connected to the lower end of the rotating shaft (92); a rack (95) is fixedly connected to the support frame (1) on one side along the direction of the guide rod (11), and the rack (95) is tangent to the gear (94); The clamping structure (91) is also provided on the upper end surface of the semi-cylindrical rotating body (96); the semi-cylindrical rotating body (96) is rotatably connected to the semi-cylindrical hole at the lower end of the second forming mold (5) through the cylindrical surface; a first arc groove is opened on the cylindrical surface of the semi-cylindrical rotating body (96); a first magnetic strip (97) is fixedly connected in the first arc groove; a second arc groove is provided on the semi-cylindrical hole corresponding to the position of the first arc groove; a second magnetic strip (98) is fixedly connected in the second arc groove.

2. The blow molding equipment for producing plastic products according to claim 1, characterized in that: The lower end of the semi-cylindrical surface (81) is provided with a semi-cylindrical step surface (83); the thickness of the semi-cylindrical step surface (83) is 2-2.8mm.

3. The blow molding equipment for producing plastic products according to claim 1, characterized in that: The sealing component (84) includes a movable insert plate (841) and a first cylinder (842); a T-slot is provided on the fixed cutting block (8) in a direction perpendicular to the mold closing surface; the movable insert plate (841) is slidably connected in the T-slot; the extended end of the movable insert plate (841) is fixedly connected to the cylinder rod of the first cylinder (842); the cylinder body of the first cylinder (842) is fixedly connected to the first molding mold (4) or the second molding mold (5) through a mounting plate; when the movable insert plate (841) is fully extended, the two movable insert plates (841) are in contact with each other.

4. The blow molding equipment for producing plastic products according to claim 1, characterized in that: The intubation and blowing component (7) includes an air blowing tube (71), a guide sleeve (72), a connecting block (73), and a second cylinder (74); the guide sleeve (72) is fixedly connected vertically on the mounting platform (12); the air blowing tube (71) is slidably connected inside the guide sleeve (72); one end of the connecting block (73) is fixedly connected to the air blowing tube (71); the other end of the connecting block (73) is fixedly connected to the cylinder rod of the second cylinder (74); the cylinder body of the second cylinder (74) is fixedly connected to the mounting platform (12).

Images