Machining die for large-diameter plastic bent pipe

Abstract

A large-diameter plastic bent pipe machining die comprises a cavity plate and a core plate, a bent pipe cavity face is arranged on the cavity plate, a bent pipe core face is arranged on the core plate, the bent pipe cavity face and the bent pipe core face are correspondingly matched to form a cavity, a straight core sliding block is arranged on one side of the core plate in a sliding mode, and a straight core is arranged on the straight core sliding block. A cavity is formed in one side of the mold core plate, an inclined core sliding block is arranged at the corner of the other side of the mold core plate in a sliding mode, an inclined core is arranged on the inclined core sliding block, the straight core and the inclined core stretch into the cavity respectively to be matched in a colliding mode, so that a mold cavity used for filling materials is formed in the cavity, a sprue plate is arranged on the mold cavity plate, a sprue bush and a glue opening are formed in the sprue plate, and the glue opening is communicated with the mold cavity. The straight core sliding block and the inclined core sliding block are driven by respective guide rail core pulling structures to slide outwards for core pulling, and an ejection structure is arranged below the mold core plate. According to the scheme, the core pulling stroke is shortened through space transformation, the mold size is reduced, the mold is suitable for machining of small and medium-sized injection molding machines, and the equipment investment cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to a large-caliber plastic pipe processing mold, belonging to the field of injection molds. Background Art

[0002] In the water supply and drainage system engineering, large-diameter plastic elbows are needed. Such products are usually processed and molded by injection molds. According to the product structure and appearance analysis, after the product is formed, the molding core on the inner wall of the elbow needs to be pulled out of the mold. The core of the elbow mold is generally divided into two sections, including a straight core and an oblique core. The two collide to form the elbow core. When demolding, the two cylinders drive the straight core and the oblique core to pull out the core. However, in actual production, the volume of the entire elbow mold increases due to the length of the cylinder itself plus the core pulling stroke. In addition, the direction corresponding to the core pulling of the oblique core is one of the corners of the mold. The demolding direction will interfere with the machine plate of the injection molding machine. Therefore, under normal circumstances, for products of the same weight, the injection molding machine specifications required for plastic pipe fittings are greater than those required for other plastic products. In particular, large-diameter plastic elbows often require large injection molding machines for processing, which greatly increases the equipment investment cost of investors. Summary of the invention

[0003] The utility model aims to overcome the disadvantages of the prior art and provide a large-caliber plastic bending pipe processing mold which adopts a guide rail oblique core-pulling structure to reduce the mold volume and make it suitable for processing by small and medium-sized injection molding machines.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A large-caliber plastic bending tube processing mold comprises a cavity plate and a core plate. The cavity plate is provided with a bending tube cavity surface, and the core plate is provided with a bending tube core surface. The bending tube cavity surface and the bending tube core surface are matched to form a cavity. A straight core slider is slidably provided on one side of the core plate, and a straight core is provided on the straight core slider. An oblique core slider is slidably provided at a corner on the other side of the core plate, and an oblique core is provided on the oblique core slider. The straight core and the oblique core are respectively extended into the cavity and matched with each other, so that a mold cavity for filling materials is formed in the cavity. A gate plate is provided on the cavity plate, and a gate sleeve and a glue port are provided in the gate plate. The glue port is connected to the mold cavity. The straight core slider and the oblique core slider are driven by their respective guide rail core pulling structures to slide outward and pull the core. An ejection structure is provided under the core plate.

[0006] Furthermore, the guide rail core pulling structure includes two guide rail plates symmetrically arranged on the outer wall of the cavity plate, each of the two guide rail plates is provided with a "丿"-shaped guide rail groove, and the straight core slider and the inclined core slider are respectively provided with a connecting rod, and rollers are respectively provided at both ends of the connecting rod, and the rollers cooperate with the guide rail grooves.

[0007] Furthermore, a wear-resistant slide plate is arranged on the cavity plate, a T-shaped guide bar is arranged on the wear-resistant slide plate, and the straight core slider and the oblique core slider are respectively arranged on the wear-resistant slide plate and matched with the T-shaped guide bar.

[0008] Furthermore, the ejection structure includes two mold feet arranged under the core plate, a core double plate arranged under the two mold feet, a lower ejector plate and an upper ejector plate arranged between the two mold feet, an ejector connected to the upper ejector plate, and the ejector passes through the core plate and is flush with the core surface of the bent tube.

[0009] The utility model discloses a large-caliber plastic elbow processing mold. During injection molding, the mold is closed, and materials (molten plastic raw materials) are ejected from the injection head of the injection molding machine, enter the mold cavity through the gate sleeve and the glue port, fill the mold cavity, and then form a large-caliber plastic elbow in the mold cavity through cooling, shaping and other processes, and then the mold is opened. During the mold opening process, the guide rail core pulling structure uses the mold opening power to drive the straight core and the oblique core to slide outward and pull the core through the straight core slider and the oblique core slider, that is, to pull the straight core and the oblique core out of the inner wall of the plastic elbow, and then the ejection structure works to eject the plastic elbow out of the mold, and the injection molding is completed. The guide rail core pulling structure of the present invention is vertically arranged on the outer wall of the cavity plate, and drives the straight core slider and the oblique core slider to slide outward through the "丿"-shaped guide rail groove track via the connecting rod to realize the straight core and oblique core core pulling. Compared with the traditional large-diameter bending tube mold, especially for the oblique core core pulling, since the core pulling direction is located at one of the corners of the mold, the guide rail core pulling structure is transformed in space to shorten the core pulling stroke, which not only realizes the smooth core pulling, but also reduces the mold volume, making it suitable for small and medium-sized injection molding machine processing, greatly saving equipment investment costs, and has a very beneficial positive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 yes Figure 2 A-A cross-sectional schematic diagram;

[0011] Figure 2 This is a top view of a large-caliber plastic pipe bending processing mold of the utility model;

[0012] Figure 3 This is a stereoscopic diagram of a large-caliber plastic pipe bending processing mold of the utility model;

[0013] Figure 4 It is a schematic diagram of the cooperation between the roller and the guide rail groove of the utility model. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] like Figure 1 — Figure 4As shown, a large-diameter plastic bending tube processing mold includes a cavity plate 1 and a core plate 2, a bending tube cavity surface 3 is arranged on the cavity plate, and a bending tube core surface 4 is arranged on the core plate, the bending tube cavity surface 3 and the bending tube core surface 4 are matched to form a cavity, a straight core slider 5 is slidably arranged on one side of the core plate, a straight core 6 is arranged on the straight core slider, an oblique core slider 7 is slidably arranged at the corner of the other side of the core plate, an oblique core 8 is arranged on the oblique core slider, the straight core 6 and the oblique core 8 are respectively extended into the cavity and matched, so that a cavity 9 for filling materials is formed in the cavity, a gate plate 10 is arranged on the cavity plate 1, a gate sleeve 11 and a glue port 12 are arranged in the gate plate, the glue port 12 is connected to the cavity 9, the straight core slider 5 and the oblique core slider 7 are driven by their respective guide rail core pulling structures to slide outward and pull the core, and an ejection structure is arranged under the core plate 2. During injection molding, the mold is closed, and the material (molten plastic raw material) is ejected from the injection head of the injection molding machine, enters the mold cavity 9 through the gate sleeve 11 and the glue port 12, fills the mold cavity, and then forms a large-diameter plastic elbow 26 in the mold cavity 9 through cooling, shaping and other processes, and then the mold is opened. During the mold opening process, the guide rail core pulling structure uses the mold opening power to drive the straight core 6 and the oblique core 8 to slide outward through the straight core slider 5 and the oblique core slider 7, that is, to pull the straight core 6 and the oblique core 8 out of the inner wall of the plastic elbow 26, and then the ejection structure works to eject the plastic elbow out of the mold, and the injection molding is completed. The guide rail core pulling structure of the present invention is vertically arranged on the outer wall of the cavity plate 1, and drives the straight core slider 5 and the oblique core slider 7 to slide outward through the "丿"-shaped guide rail groove 16 track via the connecting rod 17, so as to realize the core pulling of the straight core 6 and the oblique core 8. Compared with the traditional large-diameter bending tube mold, especially for the oblique core core pulling, since the core pulling direction is located at one of the corners of the mold, the guide rail core pulling structure is transformed in space to shorten the core pulling stroke, which not only realizes the smooth core pulling, but also reduces the mold volume, making it suitable for small and medium-sized injection molding machine processing, greatly saving equipment investment costs, and having a very beneficial positive effect.

[0016] Furthermore, the guide rail core pulling structure comprises two guide rail plates 15 symmetrically arranged on the outer wall of the cavity plate 1, and the two guide rail plates are each provided with a guide rail groove 16 in the shape of a Chinese character "丿". The straight core slider 5 and the oblique core slider 7 are each provided with a connecting rod 17, and rollers 18 are respectively provided at both ends of the connecting rod, and the rollers 18 cooperate with the guide rail groove 16. When the mold is opened, the cavity plate 1 does not move, the core plate 2 is driven by power to separate from the cavity plate 1, and the plastic elbow 26 remains on the core plate 2, and the straight core slider 5 and the oblique core slider 7 also move with the core plate 2. Under the action of the connecting rod 17 and the roller 18, the straight core slider 5 and the oblique core slider 7 follow the "丿"-shaped guide rail groove track to pull the straight core 6 and the oblique core 8 out of the inner wall of the plastic elbow 26, and the core pulling is completed.

[0017] Further, a wear-resistant slide plate 19 is provided on the cavity plate 1, and a T-shaped guide bar 20 is provided on the wear-resistant slide plate 19. The straight core slider 5 and the inclined core slider 7 are respectively arranged on the wear-resistant slide plate 19 and cooperate with the T-shaped guide bar 20. The wear-resistant slide plate is wear-resistant and has a long service life. The T-shaped guide bar can guide the straight core slider and the inclined core slider, so that their outer sliding and resetting accuracy is high.

[0018] Further, the ejection structure includes two die feet 21 provided under the core plate 2, a core back plate 22 provided under the two die feet, a lower ejector plate 23 and an upper ejector plate 24 provided between the two die feet. A ejector pin 25 is connected to the upper ejector plate 24. The ejector pin 25 passes through the core plate 2 and is flush with the surface of the elbow core 4. When the product (plastic elbow 26) is injection molded, the ejector pin 25 abuts against the outer wall of the plastic elbow. The lower ejector plate 23 is pushed by the push rod of the injection molding machine. The lower ejector plate 23 drives the upper ejector plate 24, and the upper ejector plate 24 drives the ejector pin 25 to eject the plastic elbow 26 out of the mold.

[0019] The above specific embodiments are used to explain the present invention, which are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and scope of the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A large-caliber plastic pipe bending processing mold, characterized in that It includes a cavity plate (1) and a core plate (2). A bent pipe cavity surface (3) is provided on the cavity plate, and a bent pipe core surface (4) is provided on the core plate. The bent pipe cavity surface (3) and the bent pipe core surface (4) are correspondingly matched to form a cavity. A straight core slider (5) is slidably arranged on one side of the core plate, and a straight core (6) is provided on the straight core slider. An inclined core slider (7) is slidably arranged at the corner on the other side of the core plate, and an inclined core (8) is provided on the inclined core slider. The straight core (6) and the inclined core (8) respectively extend into the cavity and are in butt joint and cooperation to form a mold cavity (9) for filling materials in the cavity. A gating plate (10) is provided on the cavity plate (1), and a sprue bushing (11) and a gate (12) are arranged in the gating plate. The gate (12) communicates with the mold cavity (9). The straight core slider (5) and the inclined core slider (7) are driven by their respective guide rail core pulling structures to slide outwards for core pulling, and an ejection structure is arranged under the core plate (2).

2. A large-caliber plastic pipe bending mold as claimed in claim 1, characterized in that The guide rail core pulling structure includes two guide rail plates (15) symmetrically arranged on the outer wall of the cavity plate (1). A guide rail groove (16) in the shape of a "丿" is provided on each of the two guide rail plates. Connecting rods (17) are respectively arranged on the straight core slider (5) and the inclined core slider (7), and rollers (18) are arranged at both ends of the connecting rod. The rollers (18) are matched with the guide rail groove (16).

3. A large-caliber plastic pipe bending processing mold as claimed in claim 2, characterized in that A wear-resistant slide plate (19) is provided on the cavity plate (1), and a T-shaped guide bar (20) is provided on the wear-resistant slide plate (19). The straight core slider (5) and the inclined core slider (7) are respectively arranged on the wear-resistant slide plate (19) and are matched with the T-shaped guide bar (20).

4. A large-caliber plastic pipe bending processing mold as claimed in claim 1, characterized in that The ejection structure includes two mold feet (21) arranged under the core plate (2), a core backing plate (22) arranged under the two mold feet, a lower ejector plate (23) and an upper ejector plate (24) arranged between the two mold feet. An ejector pin (25) is connected to the upper ejector plate (24), and the ejector pin (25) passes through the core plate (2) and is flush with the bent pipe core surface (4).

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