A detachable elbow mold

Abstract

The application discloses a detachable elbow mold, which comprises a cambered surface plate, end fixing parts and a bending core shaft, both ends of the bending core shaft are detachably connected to the end fixing parts, the cambered surface plate comprises a plurality of cambered surface plates and can be spliced into an elbow, both ends of the elbow are inserted into the end fixing parts, and the bending core shaft is hinged to at least one cambered surface plate through a connecting rod. The detachable elbow mold can be used for fiber winding demolding, can solve the problem that the non-axisymmetric fiber winding product is difficult to demold, can be repeatedly used, does not need to be repeatedly manufactured, does not need to purchase an elbow demolding clamp device, is low in cost, is simple to operate, and can effectively improve work efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of pipe bending molds, and in particular to a detachable pipe bending mold. Background Technology

[0002] Fiber-wound fiberglass pipes are corrosion-resistant, lightweight, have high specific strength, and are customizable. Fiber-wound bent pipes have high strength and are widely used in the manufacture of high-strength, lightweight aerospace components, as well as medical devices such as artificial joints and stents. A bent pipe consists of two cylinders and a 90° bend, hence it is sometimes called a 90° bend.

[0003] Commonly used pipe bending methods in existing technologies include two approaches: one is using a sand core mold. This involves machining a pipe bending mold, adding water and sand in a specific ratio, pouring the water-sand mixture into the mold, compacting it, and then curing it in a curing oven. After curing, the mold is opened, the sand core pipe bending core is removed, and then sanded smooth. The other approach uses a pipe bending clamp. First, the clamping device must be loosened to allow the pipe to detach from the clamp. Before removing the pipe, the position and shape of the clamp need to be adjusted to prevent deformation of the shape and size during separation. The pipe should be removed gently, avoiding excessive force to prevent affecting its shape and accuracy. After removal, the pipe needs to be inspected to ensure its shape and dimensions meet requirements.

[0004] However, both of the above solutions have some drawbacks. The sand core mold cannot be reused and needs to be made repeatedly, which is quite troublesome. The pipe bending fixture requires a corresponding clamping device, which is costly and the operation steps are relatively demanding. Summary of the Invention

[0005] The purpose of this invention is to provide a detachable pipe bending mold to solve the problems existing in the prior art, so that the pipe bending mold can be reused repeatedly and the demolding operation is convenient, thereby effectively reducing costs.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] The present invention provides a detachable pipe bending mold, including an arc panel, an end fixing member and a bending mandrel. The two ends of the bending mandrel are detachably connected to the end fixing member. The arc panel includes several pieces and can be spliced ​​into a bent pipe. The two ends of the bent pipe are respectively inserted into the end fixing member. The bending mandrel is hinged to at least one of the arc panels through a connecting rod.

[0008] Preferably, the end fixing member includes a straight tube and a positioning ring. A circular partition is provided inside the straight tube in a direction perpendicular to the axis. The positioning ring is fixed to the partition by bolts, and an annular insertion groove is formed between the positioning ring and the wall of the straight tube.

[0009] Preferably, the outer wall of the straight pipe is flush with the outer wall surface of the curved pipe, and both ends of the arc panel are provided with stepped surfaces, and the insertion groove is used to insert the stepped surfaces.

[0010] Preferably, the surface of the positioning ring is flush with the port of the straight pipe, the cross-section of the positioning ring is rectangular, and the depth of the insertion groove is at least 2 mm.

[0011] Preferably, the bending mandrel has the same bending arc as the bending tube, and each end of the bending mandrel is provided with a stud, which is locked to the partition by a nut.

[0012] Preferably, the arc panel is provided with four pieces, including an inner arc plate, an outer arc plate and two symmetrically arranged side arc plates. The inner arc plate is located inside the bend, the outer arc plate is located outside the bend, and the side arc plates are located on the upper and lower sides of the bend, respectively.

[0013] Preferably, the cross-section of the bending mandrel is rectangular, and two pairs of connecting rods are symmetrically hinged on the bending mandrel. Each side arc plate is hinged with two connecting rods through ear plates and bolts, and the connecting rods can support the side arc plate to maintain the shape of the bent tube.

[0014] Preferably, a double-ended screw passes through one end of the bent mandrel, and both ends of the double-ended screw are threaded to the tube wall of the end fixing member.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The detachable bending die of the present invention can be used for fiber winding demolding, which solves the problem of difficult demolding of non-axisymmetric fiber winding products. It can be reused repeatedly, without repeated manufacturing or the need to purchase bending demolding fixtures. It has low cost, is easy to operate, and can effectively improve work efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the external structure of the detachable pipe bending mold in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the detachable pipe bending mold in an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional structural diagram of the detachable pipe bending mold in an embodiment of the present invention;

[0021] Wherein: 1-straight pipe, 2-double-ended screw, 3-nut, 4-bolt, 5-locating ring, 6-bent mandrel, 7-side arc plate, 8-inner arc plate, 9-outer arc plate, 10-connecting rod, 11-partition plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The purpose of this invention is to provide a detachable pipe bending mold to solve the problems existing in the prior art, so that the pipe bending mold can be reused repeatedly and the demolding operation is convenient, thereby effectively reducing costs.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 3 As shown: This embodiment provides a detachable pipe bending mold, including an arc panel, an end fixing member and a bending mandrel 6. The two ends of the bending mandrel 6 are detachably connected to the end fixing member. The arc panel includes several pieces and can be spliced ​​into a pipe. The two ends of the pipe are respectively inserted into the end fixing member. The bending mandrel 6 is hinged to at least one arc panel through a connecting rod 10.

[0026] Specifically, in this embodiment, the end fixing component includes a straight pipe 1 and a positioning ring 5. A circular partition 11 is arranged inside the straight pipe 1 perpendicular to the axial direction. The positioning ring 5 is fixed to the partition 11 by bolts 4, forming an annular insertion groove between the positioning ring 5 and the straight pipe wall. The outer wall of the straight pipe 1 is flush with the outer wall surface of the curved pipe. Both ends of the curved plate have stepped surfaces. The insertion groove is used to insert into the stepped surfaces, providing positioning for the four plate ends of the curved pipe. The stepped surfaces allow them to fit against the surface of the side curved plate 7, thus serving a positioning function. The surface of the positioning ring 5 is flush with the end of the straight pipe 1. The cross-section of the positioning ring 5 is rectangular, and the depth of the insertion groove is at least 2mm for easy assembly.

[0027] Specifically, in this embodiment, the bending mandrel 6 has the same bending arc as the bending tube. The central angle of the bending tube is 90°. A stud is provided at each end of the bending mandrel 6, and the studs are locked to the partition plate 11 by a nut 3. The curved panel consists of four pieces: an inner curved plate 8, an outer curved plate 9, and two symmetrically arranged side curved plates 7. The inner curved plate 8 is located inside the bending tube, the outer curved plate 9 is located outside the bending tube, and the side curved plates 7 are located on the upper and lower sides of the bending tube, respectively. In this embodiment, the side curved plates 7 are saddle-shaped and connect with the inner curved plate 8 and the outer curved plate 9, dividing the bending tube into four parts, making it easier to remove during demolding.

[0028] Specifically, in this embodiment, the cross-section of the bending mandrel 6 is rectangular. Two pairs of connecting rods 10 are symmetrically hinged on the bending mandrel 6. Each side arc plate 7 is hinged with two connecting rods 10 through ear plates and bolts 4. The connecting rods 10 can support the side arc plate 7 to maintain the shape of the bent tube. Preferably, the angle between the connecting rod 10 and the side arc plate 7 or the bending mandrel 6 is 60°-90°. The bending mandrel 6 and the side arc plate 7 form a four-bar linkage mechanism, which is more convenient for disassembly during demolding. A double-ended screw 2 passes through one end of the bending mandrel 6. Both ends of the double-ended screw 2 are threaded to the tube wall of the end fixing member to provide circumferential positioning for the bending mandrel 6 and constrain the rotation of the bending mandrel 6.

[0029] In this embodiment, when the detachable bending mold is used for composite carbon fiber winding, the nuts 3 at both ends of the bending mandrel 6 need to be tightened so that the straight tube 1 can press against the arc panel, and the connecting rod 10 can support the side arc plates 7, preventing the entire structure from loosening. During demolding, the bent tube will be subjected to a strong internal pressure after the material has solidified, making the bent tube part tightly fitted and difficult to remove. At this time, the straight tubes 1 at both ends can be removed first, and then the bending mandrel 6 can be pulled out, thereby causing the two side arc plates 7 to retract inward and fall off. The product can then be obtained by demolding through the mold. In this embodiment, the side arc plates 7 are moved by two four-bar linkages, making demolding operation convenient; at the same time, the bending mandrel 6 passes through the entire structure and plays a centering role. The connection between the straight tube 1 and the bending mandrel 6 is used to press the entire structure, ensuring the stability of the mold. The detachable bending mold of this embodiment can be reused repeatedly, eliminating the need for repeated manufacturing and the purchase of bending demolding fixtures. It has low cost, is simple to operate, and can effectively improve work efficiency.

[0030] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A detachable pipe bending mold, characterized in that: The device includes an arc panel, end fixings, and a bending mandrel. The two ends of the bending mandrel are detachably connected to the end fixings. The arc panel includes several arc panels that can be spliced ​​together to form a bent tube. The two ends of the bent tube are respectively inserted into the end fixings. The bending mandrel is hinged to at least one arc panel through a connecting rod. The end fixing component includes a straight tube and a positioning ring. A circular partition is provided inside the straight tube perpendicular to the axial direction. The positioning ring is fixed to the partition by bolts, and an annular insertion groove is formed between the positioning ring and the wall of the straight tube. The outer wall of the straight pipe is flush with the outer wall surface of the curved pipe, and both ends of the arc panel are provided with stepped surfaces, and the insertion slot is used to insert the stepped surfaces. The arc panel is provided with four pieces, including an inner arc plate, an outer arc plate and two symmetrically arranged side arc plates. The inner arc plate is located inside the bend, the outer arc plate is located outside the bend, and the side arc plates are located on the upper and lower sides of the bend, respectively. Two pairs of connecting rods are symmetrically hinged on the bending mandrel. Two connecting rods are hinged to each side arc plate through ear plates and bolts. The connecting rods can support the side arc plate to maintain the shape of the bent tube.

2. The detachable pipe bending mold according to claim 1, characterized in that: The surface of the positioning ring is flush with the port of the straight pipe, the cross-section of the positioning ring is rectangular, and the depth of the insertion groove is at least 2 mm.

3. The detachable pipe bending mold according to claim 1, characterized in that: The bending mandrel has the same bending arc as the bending tube, and each end of the bending mandrel is provided with a stud. The stud is locked to the partition plate by a nut.

4. The detachable pipe bending mold according to claim 1, characterized in that: The cross-section of the bending mandrel is rectangular.

5. The detachable pipe bending mold according to claim 1, characterized in that: One end of the bent mandrel is connected to a double-ended screw, and both ends of the double-ended screw are threaded to the pipe wall of the end fixing member.

Images