A composite pipe fitting first-in-first-out injection molding structure

Abstract

The application discloses a kind of composite pipe fittings first-in first-out injection molding structure, including a storage cylinder, the front of the storage cylinder is equipped with a rotating valve, the storage cylinder is equipped with a tubular bushing and a movable plunger, the plunger penetrates the bushing, a material injection port is arranged on the lateral wall of the storage cylinder, a pre-plastic component is arranged on the material injection port, an annular annular groove is arranged on the outer wall of the bushing, and the annular groove is matched with the material injection port, wherein the plunger is between a starting position and an end position, and the material injection port is located at the rear of the starting position. The composite pipe fittings first-in first-out injection molding structure utilizes annular runner, uniform feeding, good flow state, easy to remove air, solves the problem of residual material long retention decomposition and carbonization, and also solves the problem of product quality caused by the injection of degraded material into the pipe fittings, improves the material utilization rate.

Description

Technical Field

[0001] This invention relates to an injection molding equipment, and more specifically, to a first-in-first-out injection molding structure for composite pipe fittings. Background Technology

[0002] Existing composite pipe fittings are generally injection molded using specialized pipe fitting injection molding machines, such as Figure 1 As shown, the injection port 21A is located at the front end of the storage cylinder 200. After the plunger 300 moves forward for injection, the remaining material moves backward with the plunger under back pressure. Whenever new plasticized material enters the storage cylinder 200, the new material fills from the front end, and the remaining material cannot be completely ejected at the rear end. This results in the remaining material being stored in the storage cylinder 200 for a long time. The PE plastic will be subjected to long-term thermal decomposition, leading to (degradation) and carbonization. The carbonized material in the front part of the remaining material will mix with the new material in the next molding cycle and be injected into the pipe molding, thus affecting product quality. At the same time, whenever the production is completed and the remaining material in the storage cylinder is removed and the machine is stopped, the remaining material remains in the high-temperature storage cylinder for a long time. The PE plastic will be subjected to long-term thermal decomposition, leading to (degradation) and carbonization. After being discharged, it cannot be reused, increasing process losses and causing material waste. Summary of the Invention

[0003] Therefore, it is necessary to provide a first-in-first-out injection molding structure for composite pipe fittings to address the aforementioned technical problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A first-in-first-out (FIFO) injection molding structure for composite pipe fittings is characterized in that the FIFO injection molding structure includes a storage cylinder, a rotary valve at the front of the storage cylinder, a tubular bushing and a movable plunger inside the storage cylinder, the plunger penetrating the bushing.

[0006] The storage cylinder has a filling port on its side wall, a pre-plasticizing component on the filling port, and an annular groove on the outer wall of the bushing that mates with the filling port.

[0007] The plunger is located between a starting position and an ending position, and the injection port is located at the rear of the starting position.

[0008] As a preferred embodiment of the present invention,

[0009] The front end of the bushing and the storage cylinder have a pre-set first single-sided gap, and the first single-sided gap and the circumferential groove form a circumferential flow channel.

[0010] In a preferred embodiment of the present invention, the first single-sided gap is 3mm to 12mm.

[0011] In a preferred embodiment of the present invention, the first single-sided gap is 7.5 mm.

[0012] In a preferred embodiment of the present invention, the rear part of the storage cylinder is provided with a storage cylinder support and a cover, and the rear end face of the bushing is provided with a plurality of bushing screw holes. The bushing screw holes are connected to the cover through a first fastening bolt and a first spring washer, and the storage cylinder is connected to the storage cylinder support through a second fastening bolt and a second spring washer.

[0013] In a preferred embodiment of the present invention, the inner hole of the bushing is fitted with the plunger, and a pre-set second single-sided gap is provided between the inner hole of the bushing and the plunger, the second single-sided gap being 0.02 mm to 0.08 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The first-in-first-out injection molding structure of this composite pipe fitting utilizes a circumferential flow channel, ensuring uniform feeding, good flow, and easy air removal. This solves the problems of long-term retention, decomposition, and carbonization of residual material. At the same time, it also solves the problem of product quality caused by the injection of degradable material into the pipe fitting. After production, the storage tank is emptied of residual material for reuse, improving material utilization. Attached Figure Description

[0016] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the injection molding process for existing composite pipe fittings.

[0018] Figure 2 This is a cross-sectional schematic diagram of the first-in-first-out injection molding structure of the composite pipe fitting of the present invention;

[0019] Figure 3 for Figure 2 A detailed enlarged schematic diagram of area A in the cross-sectional schematic diagram of the first-in-first-out injection molding structure of the composite pipe fittings in the diagram.

[0020] Figure 4 for Figure 2 A detailed enlarged schematic diagram of area B in the cross-sectional structural diagram of the first-in-first-out injection molding structure of the composite pipe fittings in the diagram.

[0021] Figure 5 for Figure 2A cross-sectional schematic diagram of the bushing structure of the first-in-first-out injection molding structure of the composite pipe fittings;

[0022] The markings in the diagram are explained as follows: 1. Pre-plasticizing component; 10. Second spring washer; 11. Rotary valve; 2. Storage cylinder; 21. Injection port; 3. Plunger; 4. Bushing; 41. Circumferential groove; 42. Bushing screw hole; 5. Storage cylinder bracket; 6. Cover; 7. First fastening bolt; 8. First spring washer; 9. Second fastening bolt; K1. Starting position; K2. Ending position; M1. First single-sided gap; M2. Second single-sided gap; S. Circumferential flow channel. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0024] like Figures 1 to 5 As shown, the first-in-first-out injection molding structure of the composite pipe fitting includes a storage cylinder 2. A rotary valve 11 is provided at the front of the storage cylinder 2. A tubular bushing 4 and a movable plunger 3 are provided inside the storage cylinder 2, and the plunger 3 passes through the bushing 4.

[0025] The storage cylinder 2 has a filling port 21 on its side wall, and a pre-plasticizing component 1 is provided on the filling port 21. The outer wall of the bushing 4 has an annular groove 41, which cooperates with the filling port 21.

[0026] The plunger 3 is located between a starting position K1 and a ending position K2, and the injection port 21 is located at the rear of the starting position K1.

[0027] The bushing 4 has a pre-set first single-sided gap M1 between its front end and the storage cylinder 2. The first single-sided gap M1 and the circumferential groove 41 form a circumferential flow channel S. The first single-sided gap is 3mm to 12mm. Preferably, the first single-sided gap is 7.5mm.

[0028] The storage cylinder 2 is provided with a storage cylinder support 5 and a cover 6 at the rear. The bushing 4 is provided with a plurality of bushing screw holes 42 on the rear end face. The bushing screw holes 42 are connected to the cover 6 by a first fastening bolt 7 and a first spring washer 8. The storage cylinder 2 is connected to the storage cylinder support 5 by a second fastening bolt 9 and a second spring washer 10.

[0029] The inner hole of the bushing 4 is fitted with the plunger 3, and there is a pre-set second single-sided gap M2 between the inner hole of the bushing 4 and the plunger 3. The second single-sided gap M2 is 0.02 mm to 0.08 mm.

[0030] The working principle of the first-in-first-out injection molding structure of this composite pipe fitting is explained below.

[0031] like Figure 1 As shown, first, confirm that the rotary valve 11 is in the closed state. The screw 12 of the pre-plasticizing component 1 begins to rotate and feed material. The plasticized material directly enters the circumferential flow channel S, resulting in uniform feeding, good flow, and easy air removal. Next, the rotary valve 11 opens. The injection molding section then advances as a whole, and the plunger 3 begins injection. Next, a pressure holding operation is performed, and the rotary valve 11 is closed. Finally, the injection molding section retracts as a whole, completing the injection molding process.

[0032] Because the injection port 21 is located behind the starting position K1, new plasticizer can be injected from the injection port 21 along the top of the plunger 3, continuously pushing the remaining material forward, thus achieving first-in, first-out (FIFO) plasticizer.

[0033] The first-in-first-out injection molding structure of this composite pipe fitting utilizes a circumferential flow channel, ensuring uniform feeding, good flow, and easy air removal. This solves the problems of long-term retention, decomposition, and carbonization of residual material. At the same time, it also solves the problem of product quality caused by the injection of degradable material into the pipe fitting. After production, the storage tank is emptied of residual material for reuse, improving material utilization.

[0034] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A composite pipe fitting first-in-first-out injection molding structure, characterized by, The composite pipe fitting first-in first-out injection molding structure comprises a storage cylinder (2), a rotary valve (11) is arranged at the front of the storage cylinder (2), a tubular bushing (4) and a movable plunger (3) are arranged in the storage cylinder (2), the plunger (3) penetrates through the bushing (4), a material injection port (21) is arranged on the side wall of the storage cylinder (2), a pre-plasticizing assembly (1) is arranged on the material injection port (21), an annular annular groove (41) is arranged on the outer wall of the bushing (4), and the annular groove (41) is matched with the material injection port (21), wherein the plunger (3) is between a starting position (K1) and an ending position (K2), and the material injection port (21) is located at the rear of the starting position (K1), the front end of the bushing (4) and the storage cylinder (2) have a first one-sided gap (M1) which is previously set, the first one-sided gap (M1) and the annular groove (41) form an annular flow channel (S), and the first one-sided gap is 3mm-12mm, the inner hole of the bushing (4) is matched with the plunger (3), and the inner hole of the bushing (4) and the plunger (3) have a second one-sided gap (M2) which is previously set, and the second one-sided gap (M2) is 0.02mm-0.08mm.

2. The composite pipe first-in-first-out injection molded structure of claim 1, wherein, The first one-sided gap is 7.5mm.

3. The composite pipe, advanced first-in-first-out injection molded structure of claim 1, wherein, the rear of the storage cylinder (2) is provided with a storage cylinder support (5) and a cover (6), a plurality of bushing screw holes (42) are arranged on the rear end face of the bushing (4), the bushing screw holes (42) are connected with the cover (6) through first fastening bolts (7) and first spring washers (8), and the storage cylinder (2) is connected with the storage cylinder support (5) through second fastening bolts (9) and second spring washers (10).

4. The composite pipe, first-in-first-out injection molded structure of claim 1, wherein, The rear end of the bushing (4) and the storage cylinder (2) are gap matched.

5. The composite pipe, advanced first-in-first-out injection molded structure of claim 1, wherein, The bushing (4) is made of 38CrMoAlA, the quenched and tempered HB is 240-269, the nitriding treatment depth is 0.3mm-0.6mm, HV is greater than or equal to 850, and the brittleness grade is less than grade II.

6. The composite pipe, advanced first-in-first-out injection molded structure of claim 1, wherein, The cross section of the annular groove (41) is semicircular.

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