A large circular arc elbow die
By setting limit tubes and limit rods on the mold body and injecting lubricating oil into the limit tubes, the problem of decreased accuracy of the mold core rotation and core pulling connection components was solved, the uniformity of the pipe wall thickness of the large round elbow pipe fittings was achieved, and the product quality was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN CENTURY JINNIU PIPE FITTING TECH CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-31
AI Technical Summary
During use, the precision of the core rotation and core pulling connection component of the existing large round elbow mold is prone to decrease, resulting in inconsistent wall thickness at the front and back of the large round elbow fitting, which affects product quality.
Limiting tubes and limiting rods are set on the mold body. The limiting rods are used to limit the front and rear movement. Lubricating oil injection holes are set on the limiting tubes to reduce wear and improve the movement accuracy of the mold core.
By using a limiting mechanism and lubricating oil in combination, the core-pulling accuracy of the mold core is improved, ensuring the consistency of the pipe wall thickness of the large round elbow fittings and improving the molding quality of the product.
Smart Images
Figure CN224576056U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, specifically a large arc bend mold. Background Technology
[0002] Large-radius elbows play a vital role in pipeline engineering. Their large bending radius makes them suitable for applications requiring significant turning radius. Large-radius elbows not only effectively reduce fluid resistance at bends, ensuring smoother fluid flow, but also help minimize damage to the elbow's back arc. They are suitable for systems with stringent fluid flow requirements and are widely used in construction, municipal engineering, and industrial fields.
[0003] During the injection molding production of large arc elbow pipe fittings, the accuracy of the core pulling action of the internal mold core and the matching of the connecting components is very important. Since the large arc elbow needs to be injection molded through the space between the cavity and the mold core, if the accuracy of the movement of the mold core's connecting components decreases, it will cause the position of the mold core to shift, directly resulting in inconsistent pipe wall thickness of the injection molded large arc elbow pipe fitting, which directly affects the quality of the product.
[0004] When the core of the existing large arc elbow mold is rotated upwards to pull the core, the movable plate that fixes the core is only positioned by the upper pin hinge. Although the mold accuracy is relatively high in the early stage, with the increase of use, the forward and backward movement clearance of the movable plate increases while rotating. This can easily cause the core to be positioned too far forward or too far back in the cavity, resulting in defects such as the front wall being thinner and the back wall being thicker or vice versa on the front and back of the injection molded pipe fitting. This needs to be improved. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a large arc elbow mold, which solves the problem that the thickness of the pipe wall of the large arc elbow pipe fitting is inconsistent before and after use due to the easy decrease in the accuracy of the mold core rotation and core pulling connection component as the number of uses increases.
[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0007] A large arc elbow mold includes a mold body with symmetrical arc-shaped cavities on the mold body. The arc centers of the two arc-shaped cavities are located on opposite sides of the two cavities. A pin is provided on the mold body at the arc center of the cavity. Movable plates are provided on both sides of the mold body and are movably hinged to the two pins. A fixing seat is fixed on the movable plate. A mold core is movably inserted into the cavity on one side of the fixing seat corresponding to the mold body.
[0008] A fixing plate is fixed above the main body of the mold. A slide block is vertically slidably connected to the fixing plate. A second fixing seat is fixed at the bottom of the slide block and movably inserted into the upper end of the cavity. Connecting rods are movably hinged to both sides of the slide block. The lower end of the connecting rod is movably hinged to the movable plate.
[0009] The bottom of the mold body is fixed with a fixed base three. Both sides of the fixed base three are fixed with limit tubes. Limit rods are movably inserted into the limit tubes. The end of the limit rods is fixedly connected to the bottom of the fixed base one.
[0010] Preferably, the mold body is further provided with an injection channel located between two cavities, and the injection port of the injection channel extends vertically through the mold body.
[0011] Preferably, the cavity, mold core, movable plate, fixed seat, connecting rod, limiting tube and limiting rod are all arranged symmetrically on the left and right.
[0012] Preferably, the limiting insertion tube is provided with a lubricating oil injection hole.
[0013] Preferably, both the limiting rod and the limiting tube are arc-shaped, and the corresponding arc center is located on the axis of the pin.
[0014] Preferably, the connecting rod is an arc-shaped rod that bends outward in the middle.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] This invention features a vertical pin limiter above the movable plate and a limiter mechanism below it. The limiter insert is used to limit the front and rear of the limiter rod, thereby further limiting the front and rear of the mold core. Lubricating oil can be injected through the oil injection hole to further reduce the wear of the limiter insert and improve accuracy. This invention solves the problem that the accuracy of the mold core rotation and core pulling connection assembly of existing large arc elbow molds tends to decrease with repeated use, resulting in inconsistent wall thickness at the front and rear of the large arc elbow fitting. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0018] In the diagram: 1. Mold body; 101. Cavity; 102. Injection runner; 2. Pin; 3. Movable plate; 4. Fixed seat one; 5. Mold core; 6. Fixed plate; 7. Slide; 8. Fixed seat two; 9. Connecting rod; 10. Fixed seat three; 11. Limiting insert; 1101. Oil injection hole; 12. Limiting rod. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] like Figure 1 As shown, this utility model provides a technical solution: a large arc elbow mold, including a mold body 1, on which symmetrical arc-shaped cavities 101 are provided, the arc centers of the two arc-shaped cavities 101 are located on the opposite surfaces of the two cavities 101, and an injection channel 102 located between the two cavities 101 is also provided on the mold body 1, the injection port of the injection channel 102 extends vertically through the mold body 1.
[0021] A pin 2 is provided at the arc center position of the mold body 1 corresponding to the cavity 101. Movable plates 3 are provided on both sides of the mold body 1, which are movably hinged to the two pins 2. A fixed seat 4 is fixed on the movable plate 3. A mold core 5 is movably inserted into the cavity 101 and fixed on one side of the mold body 1.
[0022] A fixed plate 6 is fixed on the top of the mold body 1. A slide block 7 is vertically slidably connected to the fixed plate 6. A fixed seat 8 is fixed at the bottom of the slide block 7 and is movably inserted into the upper end of the cavity 101. A connecting rod 9 is movably hinged on both sides of the slide block 7. The connecting rod 9 is an arc-shaped rod that bends outward in the middle. The lower end of the connecting rod 9 is movably hinged to the movable plate 3.
[0023] The bottom of the mold body 1 is fixed with a fixed base 3 10. Both sides of the fixed base 3 10 are fixed with limit tubes 11. The limit tubes 11 are provided with lubricating oil injection holes 1101. The limit tubes 11 are movably inserted with limit rods 12. Both the limit rods 12 and the limit tubes 11 are arc-shaped, and the corresponding arc centers are located on the axis of the pin 2. The end of the limit rods 12 is fixedly connected to the bottom of the fixed base 4. The cavity 101, mold core 5, movable plate 3, fixed base 4, connecting rod 9, limit tubes 11 and limit rods 12 are all symmetrically arranged on the left and right.
[0024] Working principle:
[0025] The front of the mold body 1 also has another template, not shown in the figure, with the same shape as the mold body 1 and containing a cavity 101 and an injection runner 102. This other template is close to the mold body 1 and spliced together to form a complete large arc bend mold. After separation, it can be ejected by an additional ejector pin for demolding. An additional drive component, a hydraulic cylinder or a pneumatic cylinder, drives the slide 7 to move up and down. When the slide 7 moves down along the fixed plate 6, it drives the fixed seat 8 to insert into the upper end of the cavity 101. At the same time, the connecting rod 9 drives the movable plate 3 and its connected fixed seat 4 and mold core 5 to rotate downward around the pin 2. The mold core 5 is inserted into the cavity 101. After rotation... During the process, the limiting rod 12 is also inserted into the limiting tube 11. By setting limiting components above and below the movable plate 3 at the same time, the accuracy of the movement can be effectively improved. Hot melt material is injected into the injection channel 102 through the back of the mold body 1. After the mold cooling system cools down, demolding can be performed. Before demolding, the drive component drives the slide 7 to move upward, which drives the fixed seat 2 8 to separate from the cavity 101. At the same time, the connecting rod 9 drives the movable plate 3 and its connected fixed seat 4 and mold core 5 to rotate upward around the pin 2. The mold core 5 is pulled out from the cavity 101. During the rotation, the limiting rod 12 also moves outward from the limiting tube 11 at the same time.
Claims
1. A great circle elbow mould comprising a mould body (1) characterised in that: The mold body (1) is provided with symmetrical arc-shaped cavities (101). The arc centers of the two arc-shaped cavities (101) are located on the opposite surfaces of the two cavities (101). The mold body (1) is provided with pins (2) corresponding to the arc centers of the cavities (101). Movable plates (3) that are movably hinged to the two pins (2) are provided on both sides of the mold body (1). A fixing seat (4) is fixed on the movable plate (3). A mold core (5) that is movably inserted into the cavity (101) is fixed on one side of the fixing seat (4) corresponding to the mold body (1). A fixing plate (6) is fixed above the mold body (1). A slide block (7) is vertically slidably connected to the fixing plate (6). A fixing seat two (8) is fixed at the bottom of the slide block (7) and is movably inserted into the upper end of the cavity (101). A connecting rod (9) is movably hinged to both sides of the slide block (7). The lower end of the connecting rod (9) is movably hinged to the movable plate (3). The bottom of the mold body (1) is fixed with a fixing seat three (10), and both sides of the fixing seat three (10) are fixed with limiting tubes (11). A limiting rod (12) is movably inserted into the limiting tube (11), and the end of the limiting rod (12) is fixedly connected to the bottom of the fixing seat one (4).
2. A large circle bend mould according to claim 1, characterised in that: The mold body (1) is also provided with an injection channel (102) located between two cavities (101), and the injection port of the injection channel (102) extends vertically through the mold body (1) to the rear.
3. A large circle bend mould according to claim 1, characterised in that: The cavity (101), mold core (5), movable plate (3), fixed seat (4), connecting rod (9), limiting insertion tube (11) and limiting insertion rod (12) are all arranged symmetrically on the left and right.
4. A large circle bend mould according to claim 1, characterised in that: The limiting insertion tube (11) is provided with a lubricating oil injection hole (1101).
5. A large circle bend mould according to claim 1, characterised in that: Both the limiting rod (12) and the limiting tube (11) are arc-shaped, and the corresponding arc center is located on the axis of the pin (2).
6. A large circle bend mould according to claim 1, characterised in that: The connecting rod (9) is an arc-shaped rod that bends outward in the middle.