Manufacturing process of ABS (acrylonitrile butadiene styrene) bent pipe for climbing frame for children

Abstract

The invention relates to a manufacturing process of an ABS bent pipe for a child climbing frame, the ABS bent pipe for the child climbing frame is of a split structure and comprises an upper shell and a lower shell, the upper shell is of a semi-arc tubular structure, the middle section of the lower shell is of a semi-arc tubular structure matched with the upper shell, and the connecting sections at the two ends of the lower shell are of tubular structures. The main manufacturing process of the ABS bent pipe for the child climbing frame comprises the ten steps of shell mold manufacturing, ultrasonic clamp manufacturing, raw material pretreatment, upper shell injection molding, lower shell injection molding, cooling and curing, demolding, ultrasonic clamp installing, upper shell and lower shell bonding and finished product obtaining.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, and in particular to a manufacturing process of an ABS bent pipe for a children's climbing frame. Background Art

[0002] Children's climbing frames are one of the most popular game facilities in children's playgrounds. It can exercise children's muscle strength, flexibility and coordination, and promote physical development; at the same time, the climbing frame provides a space for grasping and stepping, so that children can explore and throw independently, and cultivate the spirit of exploration. Usually, the frame part of the children's climbing frame is built with PP plastic pipes. In order to expand the structure and function of the climbing frame, its frame structure will also become complicated. In addition to straight PP plastic pipes, various PP plastic pipes with different curvatures will also be used. The existing PP bent pipes are usually made by heating the straight PP pipes and bending them directly with a pipe bending machine. The PP bent pipes made by this hot melt method will age and their physical properties will decrease during long-term use. Especially when the curvature is very high, it is easy to gradually rebound, causing the PP bent pipe to deform, thereby causing the deformation of the overall frame of the climbing frame, posing a safety hazard. Therefore, ABS tubes are gradually used to replace PP tubes to build the frame of children's climbing frames. Compared with PP tubes, ABS tubes have higher strength and hardness, can withstand greater external forces and pressures, are more durable, and will not deform for a long time. Since ABS bent tubes cannot be made by bending them with a tube bender after heating, they can only be made by injection molding and core pulling with a tube bending core pulling machine. Although this production method is no longer limited in bending rate, if the length of the ABS bent tube is longer, the length of the core pulling machine's mandrel must also be lengthened accordingly. Since the mandrel is arc-shaped, its overall travel radius during the core pulling process will be very large, requiring a very large installation space to cooperate. There is a large waste of space, and the longer the length of the bent tube, the higher the precision requirements for the installation of the mandrel, the more difficult the installation, and the difficulty of core pulling. It is very unfriendly to manufacturers with small plant areas and little funds. Summary of the invention

[0003] The purpose of the present invention is to design a production process for an ABS bent pipe for a children's climbing frame, which is convenient to manufacture, has a small mold installation space, is convenient to remove the mold, has no restrictions on the curvature size of the bent pipe, and has high pipe strength.

[0004] The content of the present invention is: a manufacturing process of an ABS elbow pipe for a children's climbing frame, characterized in that the ABS elbow pipe for the children's climbing frame adopts a split structure, including an upper shell and a lower shell, the upper shell is a semi-arc tubular structure, the middle section of the lower shell is a semi-arc tubular structure matching the upper shell, the connecting sections at both ends of the lower shell are tubular structures, the inner wall of the connecting section is provided with evenly arranged positioning ribs, and one side of the connecting section is provided with a fixing hole; the manufacturing process of the ABS elbow pipe for the children's climbing frame comprises the following steps: S1. Shell mold production: Make the upper shell mold and lower shell mold for injection molding according to the size requirements of the drawing; S2. Ultrasonic fixture production: According to the size of the shell mold, an ultrasonic fixture is produced, the ultrasonic fixture comprises an upper fixture and a lower fixture, the upper fixture is provided with an upper arc-shaped clamping cavity, the lower fixture is provided with a lower arc-shaped clamping cavity, and the size of the arc-shaped pipeline formed by the upper arc-shaped clamping cavity and the lower arc-shaped clamping cavity is consistent with the size of the ABS elbow; S3, raw material pretreatment: dry the ABS particles in an oven at 80-85°C for 2-4 hours to remove moisture; S4, injection molding of the upper shell: first, add the dried ABS particles into the hopper of the injection molding machine for heating and melting, and then pressurize the melted ABS particles into the mold cavity of the upper shell mold through the screw of the injection molding machine until the entire cavity is filled and the pressurization is stopped; S5, injection molding of the lower shell: mandrels are installed at both ends of the mold cavity of the lower shell mold, and the length of the mandrel matches the length of the lower shell connecting section; the molten ABS particles are pressurized into the mold cavity of the lower shell mold through the screw of the injection molding machine until the entire cavity is filled and the pressurization is stopped; S6, cooling and solidification: after injection molding, wait for the upper shell and lower shell of the ABS elbow to cool and solidify; S7, demoulding: after the shell is cooled and solidified, for the upper shell, the upper shell mold is opened, the upper shell is taken out, and the edge of the upper shell is trimmed and polished; for the lower shell, the core pulling operation is first started, the mandrels at both ends of the lower shell are smoothly pulled out, and then the lower shell mold is opened, the lower shell is taken out, and finally the edge of the lower shell is trimmed and polished; S8. Install the ultrasonic fixture: fix the lower fixture of the ultrasonic fixture on the base of the ultrasonic generator, and install the upper fixture on the mechanical arm of the ultrasonic generator; S8, assembling the upper shell and the lower shell: the first step is to place the middle section of the lower shell into the lower arc-shaped clamping cavity of the lower clamp, and place the upper shell in the middle section of the lower shell to form a tubular structure; the second step is to set the parameters of the ultrasonic generator, the parameter range is 50%~60% amplitude, 0.6s~0.75s welding time, ≥0.26s cooling time, and 15kz~20kz vibration frequency; the third step is to start the ultrasonic generator, and the mechanical arm of the ultrasonic generator drives the upper clamp to move down and close the lower clamp, and the upper shell and the lower shell are bonded by the ultra-high-speed vibration of the ultrasonic generator, and according to the length of the upper shell and the lower shell, multiple segmented bonding is performed until the upper shell and the lower shell are completely bonded; S9, finished product: take out the bonded ABS elbow from the ultrasonic fixture, remove the surface burrs, and perform secondary grinding on the ABS elbow to obtain the final product.

[0005] Compared with the prior art, the present invention has the following beneficial effects: 1. The shell of the present invention is made of ABS material, which has much higher strength than PP material, and the frame structure formed is more solid and safer.

[0006] 2. Through the manufacturing process of the present invention, when the ABS elbow is manufactured, the shell can adopt a split structure of an upper shell and a lower shell. The core pulling section only has the connecting sections at both ends of the elbow, and the core pulling stroke is short. No matter how long the elbow is, the length of the core shaft does not need to be changed. It is not only convenient to take the mold, but also the core shaft of the core pulling machine occupies a small space, has good versatility and a wide range of applications; there is no limit on the curvature of the elbow shell, and the elbow made by the injection mold will not rebound during long-term use no matter how high the curvature is, and has good stability; the upper shell and the lower shell bonded by ultrasonic vibration have high bonding strength, will not break or separate, and the strength is almost the same as that of the integrally formed elbow. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the ABS elbow structure of the present invention.

[0008] Figure 2 It is a schematic diagram of the fixture structure on the ultrasonic fixture.

[0009] Figure 3 It is a schematic diagram of the lower fixture structure of the ultrasonic fixture.

[0010] In the figure: 1 upper shell, 2 lower shell, 3 connecting section, 4 positioning rib, 5 fixing hole, 6 upper clamp, 7 upper arc-shaped clamp cavity, 8, frequency stabilizing hole, 9 lower clamp, 10 lower arc-shaped clamp cavity, 11 clamp groove. DETAILED DESCRIPTION

[0011] The present invention is further described with reference to the accompanying drawings. In the description of the invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0012] like Figure 1-Figure 3As shown, the manufacturing process of the ABS elbow for children's climbing frame of the present invention, the ABS elbow for children's climbing frame adopts a split structure, including an upper shell 1 and a lower shell 2, the upper shell 1 is a semi-arc tubular structure, the middle section of the lower shell 2 is a semi-arc tubular structure matching the upper shell 1, the upper shell 1 and the middle section of the lower shell 2 are combined to form a complete tubular structure, the two ends of the lower shell 2 are connecting sections 3, the connecting section 3 adopts an integrally formed tubular structure, the inner wall of the connecting section 3 is provided with evenly arranged positioning ribs 4, and one side of the connecting section 3 is provided with a fixing hole 5 to ensure the stability of the elbow after connection; the manufacturing process of the ABS elbow for children's climbing frame comprises the following steps: S1. Shell mold production: Make the upper shell mold and lower shell mold for injection molding according to the size requirements of the drawing; S2. Ultrasonic fixture production: According to the size of the shell mold, an ultrasonic fixture is produced, and the ultrasonic fixture includes an upper fixture 6 and a lower fixture 9. The upper fixture 6 is provided with an upper arc-shaped clamping cavity 7, and a frequency stabilizing hole 8 is provided on the main body. Through the frequency stabilizing hole, when the vibration frequency of the ultrasonic fixture reaches more than 10,000 times, the furniture remains stable; the lower fixture 9 is provided with a lower arc-shaped clamping cavity 10, and a clamping groove 11 is provided on the main body. The lower fixture is fixed on the operating table through the clamping groove 11; the size of the arc pipe formed by the upper arc-shaped clamping cavity 7 and the lower arc-shaped clamping cavity 10 after closing is consistent with the size of the ABS elbow; S3, raw material pretreatment: dry the ABS particles in an oven at 80-85°C for 2-4 hours to remove moisture and ensure that there are no bubbles during molding; S4, injection molding of the upper shell 1: first, add the dried ABS particles into the hopper of the injection molding machine for heating and melting, and then pressurize the melted ABS particles into the mold cavity of the upper shell mold through the screw of the injection molding machine until the entire cavity is filled and then stop pressurizing; S5, injection molding of the lower shell 2: a mandrel is installed at both ends of the mold cavity of the lower shell mold, the length of the mandrel matches the length of the connecting section 3 of the lower shell 2, the core pulling section only has the connecting section 3 at both ends of the elbow, the core pulling stroke is short, and the length of the mandrel can remain unchanged; the molten ABS particles are pressurized and injected into the mold cavity of the lower shell mold through the screw of the injection molding machine until the entire cavity is filled and the pressurization is stopped; S6, cooling and solidification: after injection molding, wait for the upper shell 1 and the lower shell 2 of the ABS elbow to cool and solidify; S7, demoulding: after the shell is cooled and solidified, for the upper shell 1, the upper shell mold is opened, the upper shell 1 is taken out, and the edge of the upper shell 1 is trimmed and polished; for the lower shell 2, the core pulling operation is first started, the mandrels at both ends of the lower shell 2 are smoothly pulled out, and then the lower shell mold is opened, the lower shell 2 is taken out, and finally the edge of the lower shell 2 is trimmed and polished; S8, installing the ultrasonic fixture: fixing the lower fixture 9 of the ultrasonic fixture on the operating table of the ultrasonic generator, and installing the upper fixture 6 on the mechanical arm of the ultrasonic generator; S8, assembling the upper shell 1 and the lower shell 2: the first step is to place the middle section of the lower shell 2 into the lower arc-shaped clamping cavity 10 of the lower clamp 9, and place the upper shell 1 in the middle section of the lower shell 2 to form a tubular structure; the second step is to set the parameters of the ultrasonic generator, the parameter range is an amplitude of 50% to 60%, a welding time of 0.6s to 0.75s, a cooling time ≥0.26s, and a vibration frequency of 15kz to 20kz; the third step is to start the ultrasonic generator, and the mechanical arm of the ultrasonic generator drives the upper clamp 6 to move down and close with the lower clamp 9, and the upper shell 1 and the lower shell 2 are bonded by the ultra-high-speed vibration of the ultrasonic generator. According to the length of the upper shell 1 and the lower shell 2, multiple segmented bonding is performed until the upper shell 1 and the lower shell 2 are completely bonded. The upper shell 1 and the lower shell 2 bonded by ultrasonic vibration have high bonding strength and are not easy to break and separate; S9, finished product: take out the bonded ABS elbow from the ultrasonic fixture, remove the surface burrs, and perform secondary grinding on the ABS elbow to obtain the final product.

[0013] The present invention is described in detail above through the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. Any changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for manufacturing ABS elbow pipes for children's climbing frames, characterized by: The ABS elbow for children's climbing frame adopts a split shell structure, the shell comprising an upper shell (1) and a lower shell (2), the upper shell (1) is a semi-arc tubular structure, the middle section of the lower shell (2) is a semi-arc tubular structure matching the upper shell (1), the connecting sections (3) at both ends of the lower shell (2) are tubular structures, the inner wall of the connecting section (3) is provided with evenly arranged positioning ribs (4), and one side of the connecting section (3) is provided with a fixing hole (5); the manufacturing process of the ABS elbow for children's climbing frame comprises the following steps: S1. Shell mold production: Make the upper shell mold and lower shell mold for injection molding according to the size requirements of the drawing; S2. Ultrasonic fixture production: an ultrasonic fixture is produced according to the size of the shell mold, the ultrasonic fixture comprising an upper fixture (6) and a lower fixture (9), the upper fixture (6) being provided with an upper arc-shaped fixture cavity (7), the lower fixture (9) being provided with a lower arc-shaped fixture cavity (10), the size of the arc-shaped pipeline formed by the upper arc-shaped fixture cavity (7) and the lower arc-shaped fixture cavity (10) being consistent with the size of the ABS elbow; S3, raw material pretreatment: dry the ABS particles in an oven at 80-85°C for 2-4 hours to remove moisture; S4, injection molding of the upper shell (1): first, add the dried ABS particles into the hopper of the injection molding machine for heating and melting, and then pressurize the melted ABS particles into the mold cavity of the upper shell mold through the screw of the injection molding machine until the entire cavity is filled and then stop pressurizing; S5, injection molding of the lower shell (2): installing mandrels at both ends of the mold cavity of the lower shell mold, the length of the mandrels matching the length of the connecting section (3) of the lower shell (2); injecting the molten ABS particles into the mold cavity of the lower shell mold under pressure through the screw of the injection molding machine until the entire cavity is filled and then stopping the pressurization; S6, cooling and solidification: after injection molding, waiting for the upper shell (1) and the lower shell (2) of the ABS elbow to cool and solidify; S7, demoulding: after the shell is cooled and solidified, for the upper shell (1), the upper shell mold is opened, the upper shell (1) is taken out, and the edge of the upper shell (1) is trimmed and polished; for the lower shell (2), the core pulling operation is first started, the core shafts at both ends of the lower shell (2) are smoothly pulled out, and then the lower shell mold is opened, the lower shell (2) is taken out, and finally the edge of the lower shell (2) is trimmed and polished; S8, installing the ultrasonic fixture: fixing the lower fixture (9) of the ultrasonic fixture on the operating table of the ultrasonic generator, and installing the upper fixture (6) on the mechanical arm of the ultrasonic generator; S8, bonding the upper shell (1) and the lower shell (2): the first step is to place the middle section of the lower shell (2) into the lower arc-shaped clamping cavity (10) of the lower clamp (9), and place the upper shell (1) on the middle section of the lower shell (2) to form a tubular structure; the second step is to set the parameters of the ultrasonic generator, the parameter range is an amplitude of 50% to 60%, a welding time of 0.6s to 0.75s, a cooling time of ≥0.26s, and a vibration frequency of 15kz to 20kz; the third step is to start the ultrasonic generator, and the mechanical arm of the ultrasonic generator drives the upper clamp (6) to move downward and close with the lower clamp (9), and the upper shell (1) and the lower shell (2) are bonded by the ultra-high-speed vibration of the ultrasonic generator, and multiple segmented bonding is performed according to the length of the upper shell (1) and the lower shell (2) until the upper shell (1) and the lower shell (2) are completely bonded; S9, finished product: take out the bonded ABS elbow from the ultrasonic fixture, remove the surface burrs, and perform secondary grinding on the ABS elbow to obtain the final product.

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