Hollow forming device
By designing a hollow molding device that uses injection first and then blow, using injection molding hot runners, blow molding fixed molds and moving molds, combined with a movable cutter and a simple blow molding mechanism, the problem of high cost of special extrusion blowers is solved, and low-cost and high-efficiency hollow product production is achieved.
Patent Information
- Application Number
- CN202421677537.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-16
AI Technical Summary
In the prior art, special extrusion-blow molding machines are expensive, resulting in the cost of trial production of hollow products being too high, and ordinary injection molding machines cannot be effectively transformed into equipment for producing hollow products.
A hollow molding device is designed, and the injection-injection and then blow-in method is adopted. By setting an injection-molded hot runner in the fixed mold seat, a blow-molded fixed mold half is set on the fixed mold seat, and a corresponding blow-molded moving mold half is set on the moving mold seat, the horizontally movable cutter and blow-molding mechanism are used to realize the forming of the hollow product.
The device can greatly reduce the cost of producing hollow products, simplify the structure of the blow molding mechanism, improve production efficiency, and shorten the blow molding time through the cooling channel.
Smart Images
Figure CN222807594U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of plastic hollow blow molding, in particular to a hollow molding device. Background Art
[0002] Currently, hollow products are typically produced using a dedicated extrusion blow molding machine using an extrusion-then-blow method. This involves first extruding a tube blank and then blowing it into the desired hollow product. However, dedicated extrusion blow molding machines are often quite expensive, and using them solely for trial production of samples can result in high production costs and be uneconomical. Conventional injection molding machines are generally inexpensive, and modifying existing injection molding machines to produce these hollow products could significantly reduce production costs. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a hollow forming device for producing hollow products by adopting the method of first injection and then blowing.
[0004] In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a hollow molding device, comprising: a fixed mold base, and a movable mold base that performs horizontal opening and closing movements relative to the fixed mold base, the fixed mold base is provided with an injection hot runner with a discharge port facing downward, a blow molding fixed half mold is provided on the fixed mold base below the discharge port and on one side of the fixed mold base, a horizontally movable cutter is provided between the discharge port of the injection hot runner and the blow molding fixed half mold, a blow molding shaping half cavity opening toward the movable mold base is provided in the blow molding fixed half mold, a blow molding movable half mold corresponding to the blow molding fixed half mold is provided on the movable mold base, a blow molding shaping half cavity opening toward the fixed mold base is provided on the blow molding movable half mold, and a blow molding mechanism is provided on the blow molding fixed half mold or the blow molding movable half mold.
[0005] As a preferred solution, in the hollow molding device, the specific structure of the blow molding mechanism includes: a blow needle and a plunger valve body, the rear portion of the blow needle is inserted into the plunger valve body, and the plunger valve body is provided with a blow molding air inlet hole connected to the inner end port of the blow needle; the blow molding fixed half mold is provided with a plunger valve cavity facing its blow molding half cavity, a blow needle placement hole connecting the plunger valve cavity and the blow molding half cavity, and a blow molding air inlet corresponding to the blow molding air inlet hole on the plunger valve body, the blow molding fixed half mold or A valve body control port is provided on the fixed mold base and is communicated with the rear end of the plunger valve cavity away from the blow molding half cavity of the blow molding fixed half mold; the plunger valve body is provided with a columnar protrusion at one end of the blow molding half cavity close to the blow molding fixed half mold, the plunger valve body is movably arranged in the plunger valve cavity, the blowing needle extends from the blowing needle placement hole and extends into the blow molding half cavity, and the plunger valve body is respectively provided with sealing rings on both sides of its blow molding air inlet hole and the plunger valve cavity, and an elastic reset component is provided on the columnar protrusion of the plunger valve body.
[0006] As a preferred solution, in the hollow molding device, the specific structure of the blow molding mechanism includes: a blow needle and a plunger valve body, the rear portion of the blow needle is inserted into the plunger valve body, and the plunger valve body is provided with a blow molding air inlet hole connected to the inner end port of the blow needle; the blow molding movable half mold is provided with a plunger valve cavity facing its blow molding half cavity, a blow needle placement hole connecting the plunger valve cavity and the blow molding half cavity, and a blow molding air inlet corresponding to the blow molding air inlet hole on the plunger valve body, the blow molding movable half mold or A valve body control port is provided on the movable mold base and is communicated with the rear end of the blow molding half-cavity of the blow molding movable half-mold near the plunger valve cavity; the plunger valve body is provided with a columnar protrusion at one end of the blow molding half-cavity near the blow molding movable half-mold, the plunger valve body is movably arranged in the plunger valve cavity, the blowing needle protrudes from the blowing needle placement hole and extends into the blow molding half-cavity, and the plunger valve body is respectively provided with sealing rings on both sides of its blow molding air inlet hole and the plunger valve cavity, and an elastic reset component is provided on the columnar protrusion of the plunger valve body.
[0007] As a preferred solution, in the hollow molding device, the sealing ring is installed as follows: the plunger valve body is provided with annular sealing grooves matching the sealing ring on both sides of its blow molding air inlet hole, and the sealing ring is arranged in the annular sealing grooves.
[0008] As a preferred solution, in the hollow molding device, the elastic reset component is a spring.
[0009] As a preferred solution, in the hollow molding device, cooling channels are provided on the fixed and movable blow molding halves.
[0010] The beneficial effects of the utility model are:
[0011] 1. This utility model incorporates an injection hot runner with a downward-facing discharge port in the fixed mold base, a blow molding fixed half mold positioned below the discharge port and to one side of the fixed mold base on the fixed mold base, and a corresponding blow molding movable half mold positioned on the movable mold base. Furthermore, a horizontally movable cutter is provided between the discharge port of the injection hot runner and the blow molding fixed half mold. This allows the tube billet, which emerges from the discharge port of the injection hot runner and then naturally descends between the blow molding fixed and movable half molds, to be cut by the cutter. The tube billet is then blow-molded in the blow molding cavity formed by the blow molding half-cavities of the blow molding fixed and movable half molds. Compared to dedicated extrusion blow molding machines, this utility model can significantly reduce production costs.
[0012] 2. The blow molding mechanism adopted in the present invention has a very simple, compact and reliable structure, which further reduces the cost of the entire hollow molding device.
[0013] 3. The utility model greatly shortens the blow molding shaping time and improves production efficiency by arranging cooling channels on the blow molding fixed and movable half molds. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a side sectional view of the hollow forming device of the present invention.
[0015] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A.
[0016] Figure 3 yes Figure 1 Schematic diagram of the structure of the blow molding fixed half mold and injection hot runner as viewed from the right.
[0017] Figure 4 This is a diagram of the mold opening and blank injection state of the hollow molding device described in the present invention.
[0018] Figures 1 to 4 1. The figures in the figure are: 1. fixed mold base, 11. injection hot runner, 111. discharge port, 2. movable mold base, 21. valve body control port, 3. blow molding fixed half mold, 301. blow molding molding half cavity, 302. cooling hole, 4. blow molding movable half mold, 401. blow molding molding half cavity, 402. cooling hole, 403. plunger valve cavity, 41. blow molding air inlet, 5. blow needle, 6. plunger valve body, 601. annular sealing groove, 602. annular sealing groove, 603. blow molding air inlet, 61. columnar extension, 7. cutter, 8. spring, 90. tube blank, 91. hollow product, 911. first incision, 912. second incision. DETAILED DESCRIPTION
[0019] The following describes in detail a specific implementation scheme of the hollow molding device according to the present invention in conjunction with the accompanying drawings.
[0020] like Figure 1 、 Figure 3 and Figure 4As shown, a hollow molding device described in the present invention comprises: a fixed mold base 1 and a movable mold base 2 which can perform horizontal opening and closing movements relative to the fixed mold base 1, the fixed mold base 1 is provided with an injection hot runner 11 with a discharge port 111 facing downward, a blow molding fixed half mold 3 is provided on the fixed mold base 1 below the discharge port 111 and on one side of the fixed mold base 1, a horizontally movable cutter 7 is provided between the discharge port 111 of the injection hot runner 11 and the blow molding fixed half mold 3 (the specific arrangement method belongs to the conventional technology in this field and will not be described in detail here), a blow molding finalizing half cavity 301 opening toward the movable mold base 2 is provided in the blow molding fixed half mold 3, a blow molding finalizing half cavity 301 opening toward the movable mold base 2 is provided on the movable mold base 2, a blow molding finalizing half cavity 401 opening toward the fixed mold base 1 is provided on the blow molding finalizing half mold 4, and a blow molding finalizing half cavity 401 opening toward the fixed mold base 1 is provided on the blow molding finalizing half mold 4, Figure 2 As shown, the specific structure of the blow molding mechanism includes: a blowing needle 5 and a plunger valve body 6, the rear part of the blowing needle 5 is inserted into the plunger valve body 6 (which belongs to the conventional technology in this field and will not be described in detail here), and the plunger valve body 6 is provided with a blow molding air inlet 603 communicated with the inner end port of the blowing needle 5; the blow molding movable half mold 4 is provided with a plunger valve cavity 403 facing its blow molding half cavity 401, a blow needle placement hole connecting the plunger valve cavity 403 and the blow molding half cavity 401, and a blow molding air inlet 41 corresponding to the blow molding air inlet 603 on the plunger valve body 6, and the movable mold base 2 is provided with a valve body control port 21 communicated with the plunger valve cavity 403 near the rear end of the movable mold base 2; the plunger valve body 6 is provided with a columnar protrusion 61 at one end near the blow molding half cavity 401 of the blow molding movable half mold 4, and the column of the plunger valve body 6 A spring 8 serving as an elastic reset component is sleeved on the protruding portion 61, and the plunger valve body 6 is movably arranged in the plunger valve cavity 403. The blowing needle 5 extends from the blowing needle placement hole and extends into the blow molding half cavity 401 of the blow molding movable half mold 4. In addition, the plunger valve body 6 is provided with sealing rings on both sides of its blow molding air inlet hole 603 and between the plunger valve cavity 403. The installation method of the sealing ring is as follows: the plunger valve body 6 is provided with annular sealing grooves 601 and 602 respectively on both sides of its blow molding air inlet hole 603, which cooperate with the sealing ring, and the sealing ring is arranged in the corresponding annular sealing grooves 601 and 602; in this embodiment, the blow molding fixed half mold 3 is provided with a cooling channel including a plurality of cooling holes 302, and the blow molding movable half mold 4 is provided with a cooling channel including a plurality of cooling holes 402.
[0021] The working principle of this utility model is as follows: Figure 4As shown, the blow molding fixed half mold 3 and the blow molding movable half mold 4 are in an open state, and the molten plastic is injected from the discharge port 111 through the injection hot runner 11 to form a tube blank 90 of the required length. At this time, the blow molding fixed half mold 3 and the blow molding movable half mold 4 are closed, and the blow molding shaping half cavity 301 on the blow molding fixed half mold 3 and the blow molding shaping half cavity 401 on the blow molding movable half mold 4 form a complete blow molding cavity, whose mouth cutout and bottom cutout close the ends of the tube blank 90, and the cutter 7 cuts the tube blank 90. Under the action of compressed air, the blowing needle 5 penetrates the closed tube blank 90 and blows in compressed air to blow the tube blank 90 into a hollow product. 91. After a certain cooling time, the compressed air is discharged. During this time, the injection molding machine melts the glue to a predetermined amount. Then, the movable mold base 2 retreats to a predetermined position with the blow molding movable half mold 4. The hollow product 91 remains in the blow molding movable half mold 4. The molten plastic is injected from the discharge port 111 through the injection hot runner 11 again to form a tube blank 90 of the required length. At the same time, the hollow product 91 is taken out from the blow molding movable half mold 4, and then the blow molding fixed half mold 3 and the blow molding movable half mold 4 are combined to carry out the next cycle. The removed hollow product 91 is cut off at the first incision 911 and the second incision 912 at both ends to obtain a finished product.
[0022] In summary, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made in accordance with the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A hollow molding device, comprising: A fixed mold base and a movable mold base which can perform horizontal opening and closing movements relative to the fixed mold base, characterized in that the fixed mold base is provided with an injection hot runner with a discharge port facing downward, a blow molding fixed half mold is provided on the fixed mold base below the discharge port and toward one side of the fixed mold base, a horizontally movable cutter is provided between the discharge port of the injection hot runner and the blow molding fixed half mold, a blow molding shaping half cavity opening toward the movable mold base is provided in the blow molding fixed half mold, a blow molding moving half mold corresponding to the blow molding fixed half mold is provided on the movable mold base, a blow molding shaping half cavity opening toward the fixed mold base is provided on the blow molding moving half mold, and a blow molding mechanism is provided on the blow molding fixed half mold or the blow molding moving half mold.
2. A hollow molding device according to claim 1, characterized in that: The specific structure of the blow molding mechanism includes: a blow needle and a plunger valve body, the rear part of the blow needle is inserted into the plunger valve body, and the plunger valve body is provided with a blow molding air inlet hole communicated with the inner end port of the blow needle; the blow molding fixed half mold is provided with a plunger valve cavity facing its blow molding half cavity, a blow needle placement hole connecting the plunger valve cavity and the blow molding half cavity, and a blow molding air inlet corresponding to the blow molding air inlet hole on the plunger valve body, and the blow molding fixed half mold or the fixed mold seat is provided with a The cavity is far away from the blow molding half cavity of the blow molding fixed half mold, and the valve body control port is communicated with the rear end of the blow molding half cavity of the blow molding fixed half mold; the plunger valve body is provided with a columnar protrusion at one end of the blow molding half cavity close to the blow molding fixed half mold, the plunger valve body is movably arranged in the plunger valve cavity, the blowing needle protrudes from the blowing needle placement hole and extends into the blow molding half cavity, and the plunger valve body is respectively provided with sealing rings on both sides of its blow molding air inlet hole and the plunger valve cavity, and an elastic reset component is provided on the columnar protrusion of the plunger valve body.
3. A hollow molding device according to claim 1, characterized in that: The specific structure of the blow molding mechanism includes: a blow needle and a plunger valve body, the rear part of the blow needle is inserted into the plunger valve body, and the plunger valve body is provided with a blow molding air inlet hole communicated with the inner end port of the blow needle; the blow molding movable half mold is provided with a plunger valve cavity facing its blow molding half cavity, a blow needle placement hole connecting the plunger valve cavity and the blow molding half cavity, and a blow molding air inlet corresponding to the blow molding air inlet hole on the plunger valve body, and the blow molding movable half mold or the movable mold seat is provided with a The cavity is close to the rear end of the blow molding half cavity of the blow molding movable half mold; the plunger valve body is provided with a columnar protruding portion at one end of the blow molding half cavity close to the blow molding movable half mold, the plunger valve body is movably arranged in the plunger valve cavity, the blowing needle protrudes from the blowing needle placement hole and extends into the blow molding half cavity, and the plunger valve body is respectively provided with sealing rings on both sides of its blow molding air inlet hole and the plunger valve cavity, and an elastic reset component is provided on the columnar protruding portion of the plunger valve body.
4. A hollow molding device according to claim 2 or 3, characterized in that: The sealing ring is installed in the following manner: annular sealing grooves matching with the sealing ring are respectively formed on both sides of the blow molding air inlet hole of the plunger valve body, and the sealing ring is arranged in the annular sealing grooves.
5. A hollow molding device according to claim 2 or 3, characterized in that: The elastic reset component is a spring.
6. A hollow molding device according to claim 1, 2 or 3, characterized in that: The fixed and movable blow molding half molds are provided with cooling channels.