Automatic blow molding equipment and molding method

Abstract

The invention relates to the technical field of blow molding machines, in particular to automatic blow molding equipment and a molding method.The automatic blow molding equipment comprises a rack and an extrusion die head fixedly installed on the rack, a hydraulic pushing module is installed on the rack, a die is detachably installed on the hydraulic pushing module, and the die is located under the extrusion die head after being closed; a butt joint hole is formed in the bottom of the mold, a hydraulic lifting assembly is arranged under the butt joint hole, a blow molding module is fixedly installed at the top of the hydraulic lifting assembly, a blow molding pipe matched with the butt joint hole is installed at the top of the blow molding module, and a hollow profile extruded out of the extrusion mold head descends to be arranged at the top of the blow molding pipe in a sleeving mode. An extrusion part, a deformation part, a closing part and a blow molding part are sequentially formed from top to bottom after the mold is closed, and a clamping, cutting and blanking assembly for clamping the closing part and horizontally cutting off the deformation part is mounted on the rack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blow molding machines, in particular to an automatic blow molding equipment and a molding method. BACKGROUND

[0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. A tubular plastic parison of thermoplastic resin is placed in a split mold and inflated by compressed air to tightly adhere to the inner wall of the mold after the mold is closed. After cooling and demolding, various hollow products are obtained.

[0003] The working principle of the existing blow molding equipment is shown in the video: https: / / haokan.baidu.com / v?pd=wisenatural&vid=10567920595585456502 and https: / / www.zhihu.com / zvideo / 1893607218600980547. First, the bottom of the hollow profile is sealed by clamping and sealing, then the mold is moved horizontally to the two sides of the hollow profile, and the hollow profile is cut horizontally by cold cutting to form an opening at the top of the hollow profile in the mold. Then the mold moves the hollow profile with the opening upwards to the blow molding pipe below for blow molding, and then removes the upper and lower parts. Finally, the mold is opened and the mechanical arm takes away the blow molded product.

[0004] Because the existing blow molding machine adopts a vertical downward blow molding method, the mold needs to be moved horizontally, which increases the floor space, and the product structure is complex, and the process steps need to be optimized.

[0005] The above information disclosed in the background section is only used to enhance the understanding of the background of the present disclosure, and therefore it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] The purpose of the present application is to improve the blow molding method, which adopts a vertical upward blow molding method, without the need for horizontal movement of the mold, and optimizes the product structure and production process steps, to solve the above technical problems.

[0007] In order to achieve the above object, the present application provides the following technical scheme: An automatic blow molding equipment, comprising a rack and an extrusion die head fixedly installed on the rack, a hydraulic pushing module is installed on the rack, a mold is detachably installed on the hydraulic pushing module, the mold is located directly below the extrusion die head after being closed, the bottom of the mold is provided with a butt joint hole, a hydraulic lifting assembly is arranged directly below the butt joint hole, a blow molding module is fixedly installed on the top of the hydraulic lifting assembly, a blow molding pipe matched with the butt joint hole is installed on the top of the blow molding module, a hollow profile extruded in the extrusion die head is lowered to be sleeved on the top of the blow molding pipe, an extrusion part, a deformation part, a closing part and a blow molding part are sequentially formed from top to bottom after the mold is closed, a clamping and cutting blanking assembly is installed on the rack to clamp the closing part and horizontally cut the deformation part;

[0008] The hollow profile is blow molded by blowing from bottom to top in the vertical direction, the blow molding part forms a product to be processed in the mold after being closed, and the deformation part is clamped at the bottom and horizontally cut by the clamping and cutting blanking assembly, so that the upper part of the profile after being cut has a sleeve hole opening downward.

[0009] Preferably, the clamping and cutting blanking assembly comprises a mounting bracket fixedly installed on the rack, a linear movement module installed on the mounting bracket, a clamping module installed on the linear movement module, and a cutting module installed on the clamping module.

[0010] Preferably, the linear movement module comprises a sliding rod installed at the bottom of the mounting bracket, a sliding bracket slidingly installed on the sliding rod, a linear motor fixedly installed on the mounting bracket, and a transmission member fixedly installed between the output end of the linear motor and the sliding bracket.

[0011] Preferably, the clamping module comprises a guide rod fixedly installed on the sliding bracket, two symmetrically distributed clamping rods slidingly installed on the guide rod, and two hydraulic components symmetrically distributed and fixedly installed on the sliding bracket, the output end of the hydraulic component penetrates through the sliding bracket and is slidingly connected with the sliding bracket, and the output end of each hydraulic component is fixedly connected with the side wall of each clamping rod.

[0012] Preferably, the cutting module comprises a vertical plate fixedly installed on one of the clamping rods, an extension rod fixedly installed at the top of each end of the vertical plate, and a cutting wire fixedly installed between the ends of the two extension rods, and when the two clamping rods clamp the contact part of the deformation part, the cutting wire moves from one side of the deformation part to the other side to complete the cutting.

[0013] Preferably, the cutting wire is a metal component, and the diameter of the cutting wire is 0.1cm-0.3cm.

[0014] Preferably, when the clamping rods clamp the contact part of the deformation part, the clamping rod below the metal wire is in the same horizontal plane with the clamping rod below the vertical plate.

[0015] Preferably, the docking hole is in communication with a cavity in the mold, the blow molding part is located between the mold and the blow molding part when the blow molding part is lowered to the outside of the top peripheral surface of the blow molding tube, the top of the cavity is in a sealed state after the mold is closed, and the bottom is in communication with the outside through the docking hole.

[0016] In a second aspect, the present application also provides a forming method for operating the automatic blow molding device to blow mold, comprising the following steps:

[0017] S1: After the raw material is heated, a hollow profile is extruded from the extrusion die, and the hollow profile is lowered to be sleeved outside the blow molding tube;

[0018] S2: The mold is directly closed, and the bottom of the mold extrudes the hollow profile in the docking hole to the outer surface of the blow molding tube;

[0019] S3: The blow molding module injects gas into the blow molding part of the hollow profile in the mold through the blow molding tube, so that the hollow profile is blow molded and deformed in the cavity of the mold;

[0020] S4: The linear motor drives the sliding frame to slide on the slide rod through the transmission part, the sliding frame drives the clamping rod to move to both sides of the deformation part through the guide rod, the hydraulic part pushes the two clamping rods to approach each other to clamp the deformation part, the clamping rod drives the extension rod through the vertical plate, the extension rod drives the cutting wire to move from one side of the deformation part to the other side, the deformation part is horizontally cut, and the bottom of the deformation part connected with the extrusion part forms a sleeve hole which gradually expands to accommodate the blow molding tube under the action of gravity;

[0021] S5: After blow molding, the hydraulic lifting assembly drives the blow molding module and the blow molding tube to move downward, the blow molding tube is separated from the opening at the bottom of the product, then the mold is opened, the linear motor drives the clamping rod to move, the product is moved from directly above the blow molding tube to outside the rack through the folding part connected to the top of the product, then the hydraulic part drives the two clamping rods to move away from each other, and the excess part at the top and bottom of the product is manually removed;

[0022] S6: The hydraulic lifting assembly drives the blow molding tube to reset, the raw material continues to be heated to lower the bottom of the hollow profile, until the sleeve hole passes through the top end of the blow molding tube, so that the hollow profile is sleeved outside the blow molding tube, and the above operation is repeated.

[0023] In the above technical solution, the present application provides the following technical effects and advantages:

[0024] 1. Compared with the prior art, which first uses encapsulation to flatten and seal the bottom of the hollow profile, then moves the mold horizontally to both sides of the hollow profile to close the mold, and then uses cold cutting to horizontally cut the hollow profile to form an opening at the top of the hollow profile in the mold, and then uses the mold to move the upward-opening hollow profile horizontally to the bottom of the blow molding tube for blow molding, and finally allows the robotic arm to take away the blow-molded product after the mold is opened, this equipment adopts the bottom air intake blow molding method, which not only omits the encapsulation and cold cutting processes, but also eliminates the need for the mold to move horizontally and occupy horizontal space, reducing the floor space. At the same time, the clamping and cutting unloading component realizes the purpose of automated unloading and continuous production of products.

[0025] 2. The present invention, through the clamping and cutting feeding assembly, can not only clamp and suspend the closing part of the top of the product through the clamping module, but also complete the horizontal cutting of the deformed part of the hollow profile through the cutting module. This ensures that when the hollow profile continues to descend, it can be sleeved on the outside of the blow molding tube through the sleeve hole. At the same time, the linear movement module is used to quickly move the product from the mold to the outside of the frame, so as to achieve the purpose of continuous automated production.

[0026] 3. By improving existing blow molding equipment, this invention not only reduces processes and optimizes the movement of the mold, but also provides a bottom-inlet blow molding approach, offering another avenue for improvement in blow molding equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure distribution of the frame of the present invention;

[0030] Figure 3 This is a schematic diagram showing the distribution of the clamping, cutting, and feeding assembly and the mold of the present invention;

[0031] Figure 4 This is a first schematic diagram of the clamping structure of the present invention;

[0032] Figure 5 This is a second schematic diagram of the clamping structure of the present invention;

[0033] Figure 6 This is a schematic diagram of the cutting module and hollow structure of the present invention for cutting.

[0034] Figure 7Cutting module and deformation part cutting schematic diagram of the application.

[0035] Reference signs:

[0036] 1, rack; 2, extrusion die; 3, hydraulic pushing module; 4, mold; 5, butt joint hole; 6, hydraulic lifting assembly; 7, blow molding module; 8, blow molding pipe; 9, hollow profile; 9a, extrusion part; 9b, deformation part; 9c, folding part; 9d, blow molding part; 10, clamping and cutting blanking assembly; 10a, mounting frame; 10b, linear movement module; 10b1, sliding rod; 10b2, moving frame; 10b3, linear motor; 10b4, transmission part; 10c, clamping module; 10c1, guide rod; 10c2, clamping rod; 10c3, hydraulic part; 10d, cutting module; 10d1, vertical plate; 10d2, extension rod; 10d3, cutting wire; 11, sleeve hole. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0039] The present application provides a method for cutting a hollow profile, comprising the steps of: Figures 1-7The illustrated automatic blow molding equipment includes a rack 1 in the prior art and an extrusion die head 2 fixedly installed on the rack 1. Unlike the blow molding pipe 8 in the prior art which is installed on one side of the extrusion die head 2 and occupies horizontal space with the opening vertically downward, the blow molding pipe 8 is vertically upwardly arranged just below the extrusion die head 2 to reduce the occupation of horizontal space, and the blow molding pipe 8 is installed on a blow molding module 7 and provided with a hydraulic lifting assembly 6 at the bottom of the blow molding module 7. Unlike the mold 4 in the prior art which moves horizontally after closing to move the hollow profile 9 inside to just below the blow molding pipe 8 with the opening downward, a hydraulic push module 3 is installed on the rack 1, and the mold 4 is installed on the hydraulic push module 3, thereby omitting the parts for driving the mold 4 to move horizontally and only driving the mold 4 to close and open, thereby reducing the production parts. A butt joint hole 5 is formed at the bottom of the mold 4, and the butt joint hole 5 is located just above the blow molding pipe 8. After the raw material is heated, the hollow profile 9 is extruded from the extrusion die head 2. When the hollow profile 9 is lowered below the butt joint hole 5 and is sleeved on the outer peripheral surface of the blow molding pipe 8, the addition of the raw material into the extrusion die head 2 is stopped, the hydraulic push assembly is directly driven to drive the mold 4 to close, the hollow profile 9 is extruded on the outer peripheral surface of the blow molding pipe 8 through the butt joint hole 5 at the bottom of the mold 4, the top of the cavity in the mold 4 is in a sealed state after the mold 4 is closed, and the bottom is in communication with the outside through the butt joint hole 5. Therefore, the top of the mold 4 after closing will pinch the hollow profile 9. At this time, the hollow profile 9 will form an extrusion part 9a, a deformation part 9b, a folding part 9c and a blow molding part 9d from top to bottom. The extrusion part 9a refers to the part which is generally circular after being extruded from the extrusion die head 2, the deformation part 9b refers to the part whose cross section gradually changes from circular to flat, the folding part 9c refers to the part which is pinched by the mold 4 and the hollow profile 9 becomes not hollow, and the blow molding part 9d refers to the part in the cavity of the mold 4. At this time, the blow molding module 7 injects air into the blow molding part 9d through the blow molding pipe 8 in the manner of the prior art to blow mold, so that the blow molding part 9d deforms in the cavity of the mold 4 to become a product to be processed.

[0040] In order to ensure the product unloading and continuous automatic processing, we install the mounting frame 10a on the rack 1, and fix the slide rod 10b1 and the linear motor 10b3 on the mounting frame 10a, slide the slide frame 10b2 on the slide rod 10b1, and fix the transmission part 10b4 between the output end of the linear motor 10b3 and the slide frame 10b2, the slide rod 10b1, the linear motor 10b3, the slide frame 10b2 and the transmission part 10b4 constitute a linear movement module 10b, and the guide rod 10c1 and the two hydraulic parts 10c3 are fixed on the slide frame 10b2, and the two symmetrical clamping rods 10c2 are slidably installed on the guide rod 10c1, the output shaft of the hydraulic part 10c3 penetrates through the slide frame 10b2 and is in sliding connection with the slide frame 10b2, and the output ends of the two hydraulic parts 10c3 are respectively fixedly connected with the side walls of the two clamping rods 10c2, when the output shafts of the two hydraulic cylinders are elongated, the two clamping rods 10c2 will be pushed to approach each other, so that the deformed part 9b is clamped and deformed into a flat folding part 9c, the guide rod 10c1, the clamping rod 10c2 and the hydraulic part 10c3 constitute a clamping module 10c for clamping and suspending the folding part 9c; at the same time, we fix the vertical plate 10d1 on one of the clamping rods 10c2, fix the extension rod 10d2 on the top of the two ends of the vertical plate 10d1, and fix the cutting wire 10d3 between the ends of the extension rod 10d2, in the process that the two clamping rods 10c2 gradually clamp part of the deformed part 9b into the folding part 9c, the cutting wire 10d3 will move from one side of the deformed part 9b to the other side, so as to cut the deformed part 9b horizontally, so that the upper half of the cut deformed part 9b has not been folded into a flat shape at the bottom, but has a sleeve hole 11 in the middle, so that the upper half of the deformed part 9b can be inclined from the axis of the blow molding pipe 8 under the action of gravity, and become perpendicular to the ground, so that the hollow profile 9 can be sleeved on the outer peripheral surface of the blow molding pipe 8, and the cutting wire 10d3, the extension rod 10d2 and the vertical plate 10d1 constitute a cutting module 10d;

[0041] The cutting wire 10d3 is made of metal material, and the diameter of the cutting wire 10d3 is 0.1cm-0.3cm, the cutting wire 10d3 with small diameter and high strength is more convenient for cutting the hollow profile 9; when the clamping rod 10c2 below the metal wire and the clamping rod 10c2 below the vertical plate 10d1 are in the same horizontal plane, only when the cutting wire 10d3 moves above the other clamping rod 10c2, the cutting wire 10d3 can cut the bottom of the deformed part 9b completely;

[0042] In combination with the automatic blow molding device, the application also provides a molding method for operating the automatic blow molding device to perform blow molding, which comprises the following steps:

[0043] S1: According to the hollow profile 9 molding mode of the prior art, the raw material is extruded from the extrusion die 2 after being heated to form a long strip-shaped hollow profile 9. With the increase of the length of the hollow profile 9, the bottom of the hollow profile 9 gradually falls and is sleeved on the outer circumferential surface of the top of the blow molding pipe 8 under the influence of gravity, that is, the bottom surface of the hollow profile 9 is lower than the butt joint hole 5;

[0044] S2: Then the mold 4 is closed by the hydraulic pushing module 3. The top of the closed mold 4 clamps the hollow profile 9 into a folding part 9c, and the bottom of the hollow profile 9 is clamped on the outer circumferential surface of the blow molding pipe 8 through the butt joint hole 5, so as to ensure that the cavity of the mold 4 is sealed;

[0045] S3: Then, according to the mode of the prior art, the blow molding module 7 injects gas into the blow molding part 9d through the blow molding pipe 8, so that the gas drives the blow molding part 9d to deform and tightly adhere to the cavity;

[0046] S4: During the process of S3, the linear motor 10b3 drives the sliding frame 10b2 to slide on the slide rod 10b1 through the transmission part 10b4. The sliding frame 10b2 drives the clamping rod 10c2 to move to both sides of the deformation part 9b through the guide rod 10c1, and then the hydraulic part 10c3 pushes the two clamping rods 10c2 to move close to each other to clamp the deformation part 9b. The clamping rod 10c2 moves to drive the extension rod 10d2 through the vertical plate 10d1, the extension rod 10d2 drives the cutting wire 10d3 to move from one side of the deformation part 9b to the other side, cuts the deformation part 9b horizontally, and forms a sleeve hole 11 at the bottom of the upper part of the deformation part 9b;

[0047] S5: After blow molding, the hydraulic lifting assembly 6 drives the blow molding module 7 and the blow molding pipe 8 to move downward. After the blow molding pipe 8 is separated from the opening at the bottom of the product, the mold 4 is opened. At this time, the product to be processed is suspended between the two clamping rods 10c2 through the folding part 9c. The shaft linear motor 10b3 drives the clamping rod 10c2 to move away from the blow molding pipe 8 side, so that the product is moved from above the blow molding pipe 8 to outside the rack 1. Then the hydraulic part 10c3 drives the two clamping rods 10c2 to move away from each other. After the product is removed from the clamping rod 10c2 by artificial, the excess part at the top and bottom of the product is removed;

[0048] S6: Finally, the blow molding pipe 8 is reset by the hydraulic lifting assembly 6. The raw material continues to be heated to make the bottom of the hollow profile 9 fall until the sleeve hole 11 passes through the top end of the blow molding pipe 8, so that the hollow profile 9 is sleeved on the blow molding pipe 8. The above operation is repeated.

[0049] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the application.

Claims

1. An automated blow molding equipment, comprising a frame (1) and an extrusion die (2) fixedly mounted on the frame (1), characterized in that: A hydraulic push module (3) is installed on the frame (1). A mold (4) is detachably installed on the hydraulic push module (3). After the mold (4) is closed, it is located directly below the extrusion die (2). The bottom of the mold (4) has a docking hole (5). A hydraulic lifting component (6) is set directly below the docking hole (5). A blow molding module (7) is fixedly installed on the top of the hydraulic lifting component (6). A blow molding tube (8) that mates with the docking hole (5) is installed on the top of the blow molding module (7). The hollow profile (9) extruded in the extrusion die (2) descends to fit on the top of the blow molding tube (8). After the mold (4) is closed, an extrusion part (9a), a deformation part (9b), a closing part (9c), and a blow molding part (9d) are formed from top to bottom. A clamping and cutting feeding component (10) is installed on the frame (1) to clamp the closing part (9c) and horizontally cut the deformation part (9b). The hollow profile (9) is blown vertically upwards to form the product to be processed in the mold (4) of the blown part (9d). The bottom of the deformed part (9b) is clamped and horizontally cut by the clamping and cutting assembly (10), so that the upper part of the deformed part (9b) of the profile has a downward opening sleeve hole (11).

2. The automated blow molding equipment according to claim 1, characterized in that: The clamping and cutting assembly (10) includes a mounting bracket (10a) fixedly mounted on the frame (1), a linear moving module (10b) mounted on the mounting bracket (10a), a clamping module (10c) mounted on the linear moving module (10b), and a cutting module (10d) mounted on the clamping module (10c).

3. The automated blow molding equipment according to claim 2, characterized in that: The linear motion module (10b) includes a slide rod (10b1) mounted on the bottom of the mounting frame (10a), a sliding frame (10b2) slidably mounted on the slide rod (10b1), a linear motor (10b3) fixedly mounted on the mounting frame (10a), and a transmission component (10b4) fixedly mounted between the output end of the linear motor (10b3) and the sliding frame (10b2).

4. An automated blow molding equipment according to claim 3, characterized in that: The clamping module (10c) includes a guide rod (10c1) fixedly installed on the sliding frame (10b2), two symmetrically distributed clamping rods (10c2) slidably installed on the guide rod (10c1), and two symmetrically distributed hydraulic components (10c3) fixedly installed on the sliding frame (10b2). The output end of the hydraulic component (10c3) passes through the sliding frame (10b2) and is slidably connected to the sliding frame (10b2). The output ends of the two hydraulic components (10c3) are respectively fixedly connected to the side walls of the two clamping rods (10c2).

5. An automated blow molding equipment according to claim 4, characterized in that: The cutting module (10d) includes a vertical plate (10d1) fixedly installed on one of the clamping rods (10c2), extension rods (10d2) fixedly installed at the top of both ends of the vertical plate (10d1), and a cutting wire (10d3) fixedly installed between the ends of the two extension rods (10d2). When the two clamping rods (10c2) clamp the contact part of the deformed part (9b), the cutting wire (10d3) moves from one side of the deformed part (9b) to the other side to complete the cutting.

6. An automated blow molding equipment according to claim 5, characterized in that: The cutting wire (10d3) is made of metal and has a diameter of 0.1cm-0.3cm.

7. An automated blow molding equipment according to claim 4, characterized in that: When the clamping rod (10c2) clamps the contact portion of the deformed part (9b), the clamping rod (10c2) directly below the metal wire and the clamping rod (10c2) directly below the vertical plate (10d1) are on the same horizontal plane.

8. An automated blow molding equipment according to claim 1, characterized in that: The docking hole (5) is connected to the cavity inside the mold (4). When the blow molding part (9d) descends to the outer periphery of the top of the blow molding tube (8), the blow molding part (9d) is located between the mold (4) and the blow molding part (9d). After the mold (4) is closed, the top of the cavity is sealed and the bottom is connected to the outside through the docking hole (5).

9. A molding method for operating an automated blow molding equipment according to any one of claims 1-8 to perform blow molding, characterized in that: Includes the following steps: S1: After the raw material is heated, a hollow profile is extruded from the extrusion die (2), and the hollow profile descends to be sleeved outside the blow molding tube (8); S2: The mold (4) is directly closed, and the bottom of the mold (4) presses the hollow profile (9) in the docking hole (5) onto the outer surface of the blow molding tube (8); S3: The blow molding module (7) injects gas into the blow molding part (9d) of the hollow profile (9) in the mold (4) through the blow molding tube (8), so that the hollow profile (9) is blow molded and deformed in the cavity of the mold (4); S4: The linear motor (10b3) drives the sliding frame (10b2) to slide on the sliding rod (10b1) through the transmission component (10b4). The sliding frame (10b2) drives the clamping rod (10c2) to move to both sides of the deformable part (9b) through the guide rod (10c1). The hydraulic component (10c3) pushes the two clamping rods (10c2) to move closer to each other to clamp the deformable part (9b). The clamping rod (10c2) drives the extension rod (10d2) through the vertical plate (10d1). The extension rod (10d2) drives the cutting wire (10d3) to move from one side of the deformable part (9b) to the other side, horizontally cutting the deformable part (9b). The bottom of the deformable part (9b) connected to the extrusion part (9a) forms a sleeve hole (11). Under the action of gravity, the sleeve hole (11) gradually expands to accommodate the blow-molded tube (8). S5: After blow molding, the hydraulic lifting component (6) drives the blow molding module (7) and blow molding tube (8) to move downward. After the blow molding tube (8) separates from the bottom opening of the product, the mold (4) opens. The linear motor (10b3) drives the clamping rod (10c2) to move. The product is moved from directly above the blow molding tube (8) to outside the frame (1) through the closing part (9c) connected to the top of the product. Then the hydraulic component (10c3) drives the two clamping rods (10c2) to move away from each other. The excess parts of the top and bottom of the product are removed manually. S6: The hydraulic lifting assembly (6) drives the blow molding tube (8) to reset. The raw material continues to be heated so that the bottom of the hollow profile (9) descends until the sleeve hole (11) passes through the top of the blow molding tube (8) so that the hollow profile (9) is sleeved on the outside of the blow molding tube (8). The above operation is repeated.

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