A device and method for manufacturing silica gel capillary based on gas injection molding

Abstract

The application relates to the field of silica gel tube manufacturing devices, in particular to a silica gel capillary tube manufacturing device and method based on gas injection molding, wherein the device comprises a gas pump, a pressure regulating valve, a first hand valve switch, a silica gel preparation device and a second hand valve switch which are sequentially connected; the silica gel preparation device comprises a capillary glass tube for connecting the first hand valve switch and the second hand valve switch; the capillary glass tube is provided with a fixed glass tube; first heating rods and second heating rods for heating the fixed glass tube are arranged on the two sides of the fixed glass tube. The device and the method can use heat-curable silica gel liquid to manufacture silica gel capillary tubes with small size, high quality, specific length, uniform or eccentric hollow tube wall.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of silicone tube manufacturing devices, in particular to a silicone capillary tube manufacturing device and method based on gas injection molding. BACKGROUND

[0002] Silicone capillary tubes are made of silicone rubber, which is a tubular material with excellent properties. Due to its excellent chemical resistance and transparency, it is widely used in medical, electronic, chemical, food and other fields. The existing silicone capillary tube manufacturing equipment generally uses extrusion molding process to manufacture silicone capillary tubes. Due to the limitation of mold processing precision and immature micro-size silicone extrusion molding process, the outer diameter of common silicone capillary tubes on the market is generally more than one millimeter. The silicone tube with an outer diameter of less than one millimeter also has problems such as thick tube wall, small inner diameter ratio, and poor flexibility of silicone tube. This limits the use of silicone capillary tubes.

[0003] In the small-batch silicone capillary tube manufacturing method mainly used for scientific research experiments, a metal wire is usually used as a template to inject silicone raw materials into a tubular mold, and then the small-size silicone capillary tube is manufactured by processing. This method has a complex processing technology. And the mold processing precision is very high, especially the coaxiality of the metal wire and the tubular mold is very high. Another manufacturing method is to use an electrified metal wire as a heat source and place it in a thermosetting silicone liquid for heating. A layer of silicone layer is formed on the outer surface of the metal wire, and then the metal wire is taken out to manufacture a hollow silicone tube. The silicone capillary tube manufactured by this method is prone to problems such as uneven tube wall thickness and uneven outer surface of the silicone tube.

[0004] Therefore, it is necessary to design a silicone capillary tube manufacturing device to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a silicone capillary tube manufacturing device and method based on gas injection molding, which can use thermosetting silicone liquid to manufacture small-size, uniform or eccentric hollow silicone capillary tubes.

[0006] The technical scheme of the present application is a silicone capillary tube manufacturing device based on gas injection molding, which comprises a gas pump, a pressure regulating valve, a first hand valve switch, a glue making device, and a second hand valve switch connected in sequence. The glue making device comprises a capillary glass tube for connecting the first hand valve switch and the second hand valve switch, and a fixed glass tube is provided outside the capillary glass tube. First and second heating rods for heating the fixed glass tube are arranged on both sides of the fixed glass tube.

[0007] Further, the air pump is connected with the pressure regulating valve through a first air pipe, the pressure regulating valve is connected with the first hand valve switch through a second air pipe, the first hand valve switch is connected with the glue making device through a third air pipe, and the glue making device is connected with one port of the second hand valve switch through a fourth air pipe.

[0008] Further, the other port of the second hand valve switch is provided with a fifth air pipe.

[0009] Further, the third air pipe and the fourth air pipe are both elbow pipes.

[0010] Further, the air pump, the pressure regulating valve, the glue making device, the first hand valve switch and the second hand valve switch are all fixed on the rack.

[0011] Further, the two ends of the first heating rod, the fixed glass pipe and the second heating rod are all fixed on the rack through the mounting seat.

[0012] Further, the upper end of the capillary glass pipe is provided with a sixth air pipe, and the lower end of the capillary glass pipe is provided with a seventh air pipe.

[0013] Further, the sixth air pipe is connected with the third air pipe through a first air pipe joint, and the seventh air pipe is connected with the fourth air pipe through a second air pipe joint.

[0014] A kind of based on gas injection molding's silica gel capillary tube manufacturing method, using a kind of based on gas injection molding's silica gel capillary tube manufacturing device, including the following steps:

[0015] (1) close the pressure regulating valve and air pump, open the first hand valve switch and the second hand valve switch, ensure that air passage is unobstructed;

[0016] (2) inject thermosetting silica gel liquid through the second hand valve switch, silica gel liquid reaches capillary glass pipe, until silica gel liquid fills capillary glass pipe, stop injecting silica gel liquid;

[0017] (3) open the air pump and pressure regulating valve, inject air into silica gel liquid in capillary glass pipe, form a hollow silica gel layer;

[0018] (4) close the air pump, pressure regulating valve, first hand valve switch and second hand valve switch, form airtight gas environment in capillary glass pipe, then open the first heating rod and the second heating rod to heat and solidify silica gel liquid remaining on capillary glass pipe;

[0019] (5) hollow silica gel capillary tube is taken out from capillary glass pipe after heating is completed.

[0020] Further, according to the need, the air pressure of the pressure regulating valve is adjusted to control the wall thickness of the silica gel capillary tube; or the capillary glass tube with different inner diameter is adjusted to control the outer diameter of the silica gel capillary tube; or the ventilation time is adjusted to control the length of the silica gel capillary tube; or the silica gel preparation device is placed horizontally, and the eccentric hollow silica gel capillary tube is obtained by prolonging the curing time.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The device uses the principle of heat curing of thermosetting silica gel liquid, and the capillary glass tube is used as a mold to make a silica gel capillary tube with a hollow pipe by gas injection. The method is simple, the device is simple and reliable, and the small-size, high-quality and specific-length silica gel capillary tube (outer diameter less than 1 mm) produced has a smooth and flat surface and good flexibility.

[0023] 2. The wall thickness of the silica gel capillary tube is conveniently changed by controlling the air pressure, and the wall of the silica gel tube is uniform, and the wall thickness is less than that of the commercially available silica gel capillary tube.

[0024] 3. The outer diameter of the silica gel capillary tube is conveniently changed by using capillary glass tubes with different inner diameters.

[0025] 4. Eccentric hollow silica gel capillary tubes can also be conveniently obtained by changing the placement of the device and the curing time. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the present application;

[0027] Figure 2 is a schematic diagram of the upper end structure of the glue injection device of the present application Figure One ;

[0028] Figure 3 is a schematic diagram of the lower end structure of the glue injection device of the present application Figure Two ;

[0029] Figure 4 is a schematic diagram of the principle of gas injection molding of the present application;

[0030] Figure 5 is a sectional view of the capillary silica gel tube after curing and molding of the capillary glass tube in the present application; wherein the left figure is a hollow silica gel capillary tube with uniform wall thickness, and the right figure is an eccentric hollow silica gel capillary tube

[0031] Figure 6 is a sectional view of the capillary silica gel tube after curing and molding of the capillary glass tube in the present application; wherein the left figure is a hollow silica gel capillary tube with uniform wall thickness, and the right figure is an eccentric hollow silica gel capillary tube.

[0032] In the figure: 1 air pump, 2 first air pipe, 3 pressure regulating valve, 4 second air pipe, 5 first hand valve switch, 6 third air pipe, 7 first air pipe adapter, 8 glue making device, 9 glue making device mounting seat, 10 second air pipe adapter, 11 fourth air pipe, 12 second hand valve switch, 13 fifth air pipe, 14 rack, 80 sixth air pipe, 81 capillary glass tube, 82 fixed glass tube, 83 first heating rod, 84 second heating rod, 85 seventh air pipe, 86 air, 87 silica gel liquid, 88 silica gel capillary tube. DETAILED DESCRIPTION

[0033] In order to make the above features and advantages of the present application more apparent, the following specific examples are described in detail below, together with the accompanying drawings, as follows, but the present application is not limited thereto.

[0034] REFERENCE Figures 1 to 6

[0035] A silica gel capillary tube manufacturing device based on gas injection molding, comprising air pump 1, pressure regulating valve 3, first hand valve switch 5, glue making device 8, second hand valve switch 12 connected in sequence, the glue making device comprises capillary glass tube 81 for connecting the first hand valve switch and the second hand valve switch, the capillary glass tube is sleeved with fixed glass tube 82, and first heating rod 83 and second heating rod 84 for heating the fixed glass tube are arranged on both sides of the fixed glass tube correspondingly. The fixed glass tube 82 is heated by the first heating rod 83 and the second heating rod 84, further heating the capillary glass tube 81 in the fixed glass tube 82, and then heating and curing the silica gel liquid 87 in the capillary glass tube 81.

[0036] In this embodiment, the air pump is connected with the pressure regulating valve through the first air pipe 2, the pressure regulating valve is connected with the first hand valve switch through the second air pipe 4, the first hand valve switch is connected with the glue making device through the third air pipe 6, the glue making device is connected with one port of the second hand valve switch through the fourth air pipe 11, and the other port of the second hand valve switch is provided with the fifth air pipe 13.

[0037] In this embodiment, the third air pipe and the fourth air pipe are both elbow pipes.

[0038] In this embodiment, the air pump, the pressure regulating valve, the glue making device, the first hand valve switch and the second hand valve switch are all fixed on the rack 14.

[0039] In this embodiment, the two ends of the first heating rod, the fixed glass tube and the second heating rod are fixed on the rack through the mounting seat.

[0040] In this embodiment, the upper end of the capillary glass tube is provided with a sixth gas pipe 80, and the lower end of the capillary glass tube is provided with a seventh gas pipe 85. The sixth gas pipe is connected with the third gas pipe through the first gas pipe joint 7, and the seventh gas pipe is connected with the fourth gas pipe through the second gas pipe joint 10. The above-mentioned parts jointly constitute a gas passage.

[0041] A method for manufacturing a silica gel capillary tube based on gas injection molding, using a silica gel capillary tube manufacturing device based on gas injection molding, comprising the following steps:

[0042] (1) Close the pressure regulating valve 3 and the air pump 1, and open the first hand valve switch 5 and the second hand valve switch 12 to ensure that the gas passage is unobstructed;

[0043] (2) Inject the thermosetting silica gel liquid through the open end of the fifth gas pipe 13. The silica gel liquid passes through the second hand valve switch 12, the fourth gas pipe 11, the second gas pipe joint 10, and the seventh gas pipe 85 to reach the capillary glass tube. Until the silica gel liquid 87 fills the capillary glass tube 81, stop injecting the silica gel liquid 87;

[0044] (3) Open the air pump 1 and the pressure regulating valve 3 to inject air 86 into the silica gel liquid 87 in the capillary glass tube 81 to form a hollow silica gel layer;

[0045] (4) Close the air pump 1, the pressure regulating valve 3, the first hand valve switch 5, and the second hand valve switch 12 to form a closed gas environment in the capillary glass tube 81. Then open the first heating rod 83 and the second heating rod 84 to heat and solidify the silica gel liquid 87 remaining in the capillary glass tube 81;

[0046] (5) After the heating is completed, remove the hollow silica gel capillary tube 88 from the capillary glass tube 81.

[0047] In this embodiment, the wall thickness of the silica gel capillary tube 88 can be controlled by adjusting the air pressure of the pressure regulating valve 3 as needed; or the outer diameter of the silica gel capillary tube 88 can be controlled by adjusting the inner diameter of the capillary glass tube 81; or the length of the silica gel capillary tube 88 can be controlled by adjusting the ventilation time.

[0048] Due to the influence of gravity, the silica gel liquid 87 will settle in the capillary tube 81. By placing the silica gel device 8 horizontally and prolonging the curing time, an eccentric hollow silica gel capillary tube 88 can be obtained.

[0049] The above merely describes the preferred embodiments of the present application, and for those skilled in the art, no creative labor is needed to design different forms of the gas injection molding based silica gel capillary manufacturing device according to the teaching of the present application, and any equivalent changes, modifications, replacements and variations made within the scope of the present application should be included in the scope of the present application.

Claims

1. A method for manufacturing a silica gel capillary based on gas injection molding, using a device for manufacturing a silica gel capillary based on gas injection molding, characterized by, The silicone capillary manufacturing apparatus based on gas injection molding includes an air pump, a pressure regulating valve, a first manual valve switch, a glue-making device, and a second manual valve switch connected in sequence. The air pump is connected to the pressure regulating valve via a first air pipe, the pressure regulating valve is connected to the first manual valve switch via a second air pipe, the first manual valve switch is connected to the glue-making device via a third air pipe, and the glue-making device is connected to one port of the second manual valve switch via a fourth air pipe. The glue-making device includes a capillary glass tube for connecting the first and second manual valve switches. A sixth air pipe is installed at the upper end of the capillary glass tube, and a seventh air pipe is installed at the lower end of the capillary glass tube. A fixed glass tube is sleeved on the capillary glass tube, and a first heating rod and a second heating rod for heating the fixed glass tube are respectively arranged on both sides of the fixed glass tube. The apparatus includes the following steps: (1) Close the pressure regulating valve and the air pump, and open the first manual valve switch and the second manual valve switch to ensure that the air path is unobstructed; (2) Inject thermosetting silicone liquid through the second hand valve switch. The silicone liquid reaches the capillary glass tube until the capillary glass tube is full, then stop injecting silicone liquid. (3) Turn on the air pump and pressure regulating valve to inject air into the silica gel liquid in the capillary glass tube to form a hollow silica gel layer. (4) Turn off the air pump, pressure regulating valve, first hand valve switch and second hand valve switch to create a closed gas environment in the capillary glass tube, and then turn on the first heating rod and the second heating rod to heat and solidify the silicone liquid remaining on the capillary glass tube. (5) After heating is complete, remove the hollow silicone capillary tube from the capillary glass tube.

2. The method of claim 1, wherein the gas injection molding is performed by using a gas injection molding machine. The other port of the second hand valve switch is equipped with a fifth gas pipe.

3. The method of claim 1 or 2, wherein Both the third and fourth tracheas are curved.

4. The method of claim 1 or 2, wherein The air pump, pressure regulating valve, glue-making device, first manual valve switch, and second manual valve switch are all fixed on the frame.

5. The method of claim 4, wherein the gas injection molding is performed by using a gas injection molding machine. Both ends of the first heating rod, the fixed glass tube, and the second heating rod are fixed to the frame via mounting bases.

6. The method of claim 1, wherein the gas injection molding is performed by using a gas injection molding machine. The sixth trachea is connected to the third trachea via the first trachea connector, and the seventh trachea is connected to the fourth trachea via the second trachea connector.

7. The method of claim 1, wherein the method further comprises: As needed, the wall thickness of the silicone capillary can be controlled by adjusting the air pressure of the pressure regulating valve; or the outer diameter of the silicone capillary can be controlled by adjusting the capillary glass tubes with different inner diameters; or the length of the silicone capillary can be controlled by adjusting the air passage time; or the glue-making device can be placed horizontally and the curing time can be extended to obtain an eccentric hollow silicone capillary.

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