A right-angle elbow demolding tool

Abstract

The utility model discloses a right angle elbow demoulding frock, including support frame (1) and compressed air spray gun (2), wherein support frame (1) top surface detachably sets up right angle elbow mould core (3), and this mould core is constituted by main frame (4) and the multiple right angle bend column balanced on both sides, the right angle bend column includes short column (5) and long column (6), and the transition connection through the fillet smooth between two, and main frame (4) and short column (5) end face integral molding. Through compressed air spray gun (2) injects high pressure gas between product and mould core gap, and realizes demoulding with the deformation characteristics of polyurethane elastomer, thoroughly avoids the surface scratch, interface tearing and fracture problem caused by traditional manual prying, and combines foot switch (8) control air pump (7), and operator can synchronous positioning product with both hands, improves the demoulding yield of right angle elbow.

Description

Technical Field

[0001] This utility model relates to the technical field of right-angle bending column production equipment, specifically to a right-angle bending pipe demolding fixture. Background Technology

[0002] Polyurethane (PU) right-angle bends are pipe fittings made primarily of polyurethane elastomer. Their core feature is a 90° bending angle design, enabling vertical reversal of the fluid transport path. In high-pressure or high-frequency vibration environments, their elastic deformation capacity absorbs mechanical stress, preventing pipe rupture or leakage caused by rigid impacts.

[0003] Currently, the mainstream production process for polyurethane right-angle bent columns is compression molding. This method involves injecting premixed polyurethane raw materials into a precisely designed metal mold cavity, and then forming the desired shape in one step after high-temperature vulcanization. However, because the bent tube structure is integrally connected, it is not convenient to use automated equipment for ejection, resulting in a relatively high breakage rate during the demolding process. Traditional manual prying methods easily cause scratches on the product surface, tearing at the joints, or even complete breakage. Although polyurethane has a certain degree of elasticity, the yield rate is still relatively low. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a demolding fixture for right-angle bends.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A right-angle bend demolding fixture includes a support frame and a compressed air spray gun. The top surface of the support frame is detachably provided with a right-angle bend mold core. The right-angle bend mold core includes a main frame, and multiple right-angle bend columns are evenly distributed along both sides of the main frame. Each right-angle bend column includes a short column and a long column, and the bend between the short column and the long column is smoothly transitioned with rounded corners. The main frame is integrally connected to the end face of the short column of the right-angle bend column.

[0006] As a preferred technical solution, the compressed air spray gun is connected to an air pump, and the air pump is electrically connected to a foot switch via a reversing valve.

[0007] As a preferred technical solution, the main frame has at least two through holes, and the top surface of the support frame is fitted with plug-in posts that are compatible with the through holes.

[0008] As a preferred technical solution, the end of the long column away from the short column is configured as a frustum structure.

[0009] As a preferred technical solution, the length ratio of the long column to the short column is 1:(1-2).

[0010] As a preferred technical solution, the support frame is also provided with a thermocouple that passes through and is fixedly installed, and the thermocouple can be connected to the main frame.

[0011] As a preferred technical solution, the support frame is provided with a hook adapted to the compressed air spray gun.

[0012] As a preferred technical solution, the right-angled columns located on both sides of the main frame of the right-angled tube mold core are centrally symmetrically distributed.

[0013] The advantages and beneficial effects of this utility model are as follows: By injecting high-pressure gas into the gap between the product and the right-angle bend core through a compressed air spray gun, the risk of surface scratches and interface tearing caused by traditional manual prying is reduced or eliminated. The gas pressure is evenly applied to the inner wall of the product. Combined with the deformation characteristics of polyurethane elastomer, axial pulling is performed with the assistance of air pressure. The foot switch controls the air pump reversing valve, allowing the operator to focus on the above actions with both hands, thereby improving the yield of right-angle bends. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the support frame of this utility model; Figure 2 This is a structural schematic diagram of the right-angle pipe bending mold core and product of this utility model; Figure label: 1-Support frame, 2-Compressed air spray gun, 3-Right angle bend tube mold core, 4-Main frame, 5-Short column, 6-Long column, 7-Air pump, 8-Foot switch, 9-Through hole, 10-Plug-in column, 11-Frustum structure, 12-Thermocouple, 13-Hook. Detailed Implementation

[0015] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0016] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] This invention provides a right-angle bend demolding fixture, comprising a support frame 1, a compressed air spray gun 2, and a right-angle bend mold core 3. The support frame 1 provides stable support as a basic framework; the compressed air spray gun 2 injects high-pressure gas; the right-angle bend mold core 3 is detachably mounted on the top surface of the support frame to support polyurethane products (such as right-angle bends). The mold core consists of a main frame 4 and multiple right-angle bend columns evenly distributed on both sides. The right-angle bend columns include short columns 5 and long columns 6. The main frame 4 and the end faces of the short columns 5 are integrally formed, and the two are smoothly connected by rounded corners to ensure the smoothness of the inner wall of the product. During demolding, the compressed air spray gun 2 injects high-pressure gas (0.2-0.3 MPa) into the gap between the product and the mold core. Simultaneously, the outer circumference of the right-angle bend is manually gripped, and the product is pulled off the right-angle bend mold core 3 along the axial direction of the long column 6, achieving non-destructive demolding by utilizing the deformation characteristics of the polyurethane elastomer.

[0019] As an explanation, the so-called right-angle bend core 3 can be an accessory in the corresponding injection mold, also known as a core. The main frame 4 is usually not used as the processing surface of the molded product, but rather as a connection and support.

[0020] As an explanation, although this utility model aims to solve the demolding problem of right-angle bends, the technical solutions or implicit technical methods covered by this utility model are also effective for obtuse-angle bends. Therefore, the included angle between the short column 5 and the long column 6 is within the range of 90°-150° and falls within the scope of right-angle bends defined by this utility model.

[0021] As an explanation, the circuit connections of thermocouples, air pumps or reversing valves and foot switches are all existing technologies and can be achieved using commercially available products; therefore, they will not be elaborated upon here.

[0022] In some embodiments, the support frame 1 is made of a rigid metal material (such as stainless steel) with a flat top surface for mounting the right-angle bend mold core 3. The top surface of the support frame is provided with a plurality of plug-in posts 10, the number of which is adapted to the through holes 9 of the main frame 4, for example, at least two plug-in posts mate with the through holes to achieve quick positioning and detachable connection of the mold core.

[0023] In some possible implementations, the right-angle bending die core 3 and the support frame may also be connected by a limiting piece, limiting post, or buckle, clamp, etc., which are all within the scope of detachable connection.

[0024] In some embodiments, a thermocouple 12 is installed through and fixedly mounted on the support frame. The thermocouple is configured to be in direct contact with the main frame 4 for real-time monitoring of the mold core temperature, ensuring the thermal stability of the polyurethane product during vulcanization. The side wall of the support frame is also provided with hooks 13 to accommodate the compressed air spray gun 2, facilitating the hanging and storage of the spray gun and reducing operational interference.

[0025] In some embodiments, the main body of the right-angle bend mold core 3 is made of metal (such as aluminum alloy), and the main frame 4 is a rectangular frame with multiple right-angle bend columns evenly distributed along its two sides. Each right-angle bend column consists of a short column 5 and a long column 6, with the ratio of the length of the short column to the length of the long column being in the range of 1:(1-2). This allows for the adaptation to products of different sizes while maintaining a relatively high yield rate for demolding within this range. The rounded corners at the bends of the columns ensure a smooth transition and prevent scratches on the inner wall of the product. The end of the long column 6 furthest from the short column is configured as a frustum structure 11 with a gradually decreasing diameter, facilitating axial sliding of the product.

[0026] In some embodiments, the right-angle bent columns are symmetrically distributed on both sides of the right-angle bent tube mold core to ensure uniform stress. The main frame 4 and the end faces of the short columns 5 are fixed by integral casting or welding to avoid loosening of the connection.

[0027] The steps or working principle of this tooling are as follows: Place the vulcanized polyurethane right-angle bend product together with the support bend mold core on the top surface of the support frame 1, and fix the mold core through the plug-in post 10 and the through hole 9.

[0028] After the thermocouple monitoring shows that the right-angle bend mold core has naturally cooled to 80°C, the operator presses the foot switch 8 to activate the air pump 7. The right hand controls the compressed air spray gun 2, aiming it at the gap between the product and the mold core, such as the frustum structure 11 of the long column 6, and injects high-pressure gas. The gas pressure acts evenly on the inner wall of the product, filling the gap; simultaneously, the left hand uses the elastic deformation of polyurethane along the axial direction of the long column 6 to pull the product off the right-angle bend mold core. This tooling can increase the demolding yield from 70% using traditional methods to over 85%, reducing the risk of surface scratches and interface tearing.

[0029] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A demolding fixture for a right-angle bent pipe, characterized in that, It includes a support frame (1) and a compressed air spray gun (2). The top surface of the support frame (1) is detachably provided with a right-angle bend core (3). The right-angle bend core (3) includes a main frame (4) and multiple right-angle bend columns are evenly distributed on both sides of the main frame (4). The right-angle bend columns include short columns (5) and long columns (6). The bend between the short columns (5) and the long columns (6) is set with a smooth transition with rounded corners. The end faces of the main frame (4) and the short columns (5) are integrally connected.

2. The right-angle bend demolding fixture according to claim 1, characterized in that, The compressed air spray gun (2) is connected to an air pump (7), and the air pump (7) is electrically connected to a foot switch (8) through a reversing valve.

3. The right-angle bend demolding fixture according to claim 2, characterized in that, The main frame (4) has at least two through holes (9), and the top surface of the support frame (1) is fitted with a plug-in post (10) that is adapted to the through holes (9).

4. The right-angle bend demolding fixture according to claim 3, characterized in that, The end of the long column (6) away from the short column (5) is provided with a frustum structure (11).

5. The right-angle bend demolding fixture according to claim 3, characterized in that, The length ratio of the long column (6) to the short column (5) is 1:(1-2).

6. The right-angle bend demolding fixture according to claim 3, characterized in that, The support frame (1) is also provided with a thermocouple (12) that passes through and is fixedly installed. The thermocouple (12) is configured to be in contact with the main frame (4).

7. The right-angle bend demolding fixture according to claim 3, characterized in that, The support frame (1) is provided with a hook (13), which is adapted to a compressed air spray gun (2).

8. The right-angle bend demolding fixture according to any one of claims 1-7, characterized in that, The right-angle bent columns located on both sides of the main frame (4) of the right-angle bent tube mold core (3) are centrally symmetrically distributed.

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