Silica gel capillary tube manufacturing device and method based on gas injection molding

Abstract

The invention 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, and the device comprises an air pump, a pressure regulating valve, a first hand valve switch, a gel making device and a second hand valve switch which are connected in sequence, the glue making device comprises a capillary glass tube used for being communicated with the first hand valve switch and the second hand valve switch, the capillary glass tube is sleeved with a fixed glass tube, and a first heating rod and a second heating rod which are used for heating the fixed glass tube are correspondingly arranged on the two sides of the fixed glass tube. According to the device and the method, the hollow silica gel capillary tube which is small in size, high in quality, specific in length, uniform in tube wall or eccentric can be manufactured by using the thermosetting silica gel liquid.

Description

Technical Field

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

[0002] Silicone capillaries are made of silicone rubber, a tubular material with excellent properties. Thanks to its excellent chemical resistance and transparency, they are widely used in the fields of medical, electronics, chemical, food, etc. Existing silicone capillary manufacturing equipment generally manufactures silicone capillaries through an extrusion molding process. Limited by the mold processing accuracy and the immaturity of the micro-sized silicone extrusion molding process, the outer diameter of common silicone capillaries on the market is generally above one millimeter. Silicone tubes with an outer diameter of less than one millimeter also have problems such as thick tube walls, small inner diameter ratio, and poor flexibility of silicone tubes. This limits the use scenarios of silicone capillaries.

[0003] In the method of making small batches of silicone capillaries, which is mainly used for scientific research experiments, metal wire is usually used as a template, silicone raw materials are injected into the tubular mold, and then processed to make small-sized silicone capillaries. This method has a relatively complicated processing technology. And the mold processing accuracy is very high, especially the coaxiality of the metal wire and the tubular mold is very high. Another production method is to use an energized metal wire as a heat source, place it in a thermosetting silicone liquid for heating, and a layer of silicone will form on the outer surface of the metal wire. Then the metal wire is taken out to make a hollow silicone tube. The silicone capillaries made by this method are 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 manufacturing device to solve the above-mentioned technical problems. Summary of the invention

[0005] The object of the present invention is to provide a device and method for manufacturing silicone capillaries based on gas injection molding, which can use thermosetting silicone liquid to produce small-sized silicone capillaries with uniform tube walls or eccentric hollow tubes.

[0006] The technical solution of the present invention is: a silicone capillary manufacturing device based on gas injection molding, including an air 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 includes a capillary glass tube for connecting the first hand valve switch and the second hand valve switch, a fixed glass tube is arranged outside the capillary glass tube, and a first heating rod and a second heating rod for heating the fixed glass tube are correspondingly arranged on both sides of the fixed glass tube.

[0007] Furthermore, 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.

[0008] Furthermore, a fifth air pipe is installed at another port of the second hand valve switch.

[0009] Furthermore, the third air pipe and the fourth air pipe are both bent pipes.

[0010] Furthermore, the air pump, the pressure regulating valve, the glue making device, the first manual valve switch, and the second manual valve switch are all fixed on the frame.

[0011] Furthermore, both ends of the first heating rod, the fixed glass tube and the second heating rod are fixed on the frame via mounting seats.

[0012] Furthermore, a sixth air tube is installed at the upper end of the capillary glass tube, and a seventh air tube is installed at the lower end of the capillary glass tube.

[0013] Furthermore, the sixth air pipe is connected to the third air pipe via a first air pipe joint, and the seventh air pipe is connected to the fourth air pipe via a second air pipe joint.

[0014] A method for manufacturing a silicone capillary tube based on gas injection molding, using a silicone capillary tube manufacturing device based on gas injection molding, comprising the following steps: (1) Close the pressure regulating valve and air pump, open the first hand valve switch and the second hand valve switch to ensure that the gas path is unobstructed; (2) Inject thermosetting silicone liquid through the second hand valve switch until the silicone liquid reaches the capillary glass tube and stops injecting silicone liquid until the capillary glass tube is filled with the silicone liquid; (3) Turn on the air pump and the 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, the pressure regulating valve, the first manual valve switch and the second manual valve switch to form 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 completed, remove the hollow silicone capillary from the capillary glass tube.

[0015] Furthermore, according to needs, the air pressure of the pressure regulating valve is adjusted to control the wall thickness of the silicone capillary; or the capillary glass tubes with different inner diameters are adjusted to control the outer diameter of the silicone capillary; or the ventilation time is adjusted to control the length of the silicone capillary; or the glue making device is placed horizontally and the curing time is extended to obtain an eccentric hollow silicone capillary.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The device uses the principle of heating and curing thermosetting silicone liquid, uses a capillary glass tube as a mold, and utilizes gas injection to make a hollow silicone capillary. The method is simple, the device is simple and reliable, and the produced small-sized, high-quality, specific-length silicone capillary (outer diameter less than 1 mm) has a smooth surface and good flexibility.

[0017] 2. The wall thickness of the silicone capillary can be easily changed by controlling the air pressure. The produced silicone tube has a uniform wall and a wall thickness that is smaller than that of commercially available silicone capillaries.

[0018] 3. The outer diameter of the silicone capillary can be easily changed by using capillary glass tubes with different inner diameters.

[0019] 4. It is also possible to easily obtain an eccentric hollow silicone capillary by changing the placement of the device and the curing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The upper structure of the glue injection device of the present invention is shown in FIG. Figure 1 ; Figure 3 The lower end structure of the glue injection device of the present invention is schematically shown. Figure 2 ; Figure 4 It is a schematic diagram of the principle of gas injection molding of the present invention; Figure 5 The cross-sectional schematic diagram of the capillary glass tube after the capillary silicone tube is solidified and formed in the present invention; the left figure is a hollow silicone capillary tube with uniform wall thickness, and the right figure is an eccentric hollow silicone capillary tube Figure 6 It is a cross-sectional micrograph of the capillary glass tube after the capillary silicone tube of the present invention is solidified and formed; wherein, the left picture is a hollow silicone capillary tube with uniform wall thickness, and the right picture is an eccentric hollow silicone capillary tube.

[0021] In the figure: 1 air pump, 2 first air pipe, 3 pressure regulating valve, 4 second air pipe, 5 first manual valve switch, 6 third air pipe, 7 first air pipe adapter, 8 glue making device, 9 glue making device mounting base, 10 second air pipe adapter, 11 fourth air pipe, 12 second manual valve switch, 13 fifth air pipe, 14 frame, 80 sixth air pipe, 81 capillary glass tube, 82 fixed glass tube, 83 first heating rod, 84 second heating rod, 85 seventh air pipe, 81 capillary glass tube, 86 air, 87 silicone liquid, 88 silicone capillary tube. DETAILED DESCRIPTION

[0022] In order to make the above features and advantages of the present invention more understandable, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0023] refer to Figures 1 to 6 A silicone capillary manufacturing device based on gas injection molding comprises an air pump 1, a pressure regulating valve 3, a first hand valve switch 5, a glue making device 8, and a second hand valve switch 12 connected in sequence, wherein the glue making device comprises a capillary glass tube 81 for connecting the first hand valve switch and the second hand valve switch, wherein a fixed glass tube 82 is provided on the outer sleeve of the capillary glass tube, and a first heating rod 83 and a second heating rod 84 for heating the fixed glass tube are correspondingly provided on both sides of the fixed glass tube. The fixed glass tube 82 is heated by the first heating rod 83 and the second heating rod 84, and the capillary glass tube 81 in the fixed glass tube 82 is further heated, and the silicone liquid 87 in the capillary glass tube 81 is heated and solidified.

[0024] In this embodiment, the air pump is connected to the pressure regulating valve via the first air pipe 2, the pressure regulating valve is connected to the first hand valve switch via the second air pipe 4, the first hand valve switch is connected to the glue making device via the third air pipe 6, the glue making device is connected to one port of the second hand valve switch via the fourth air pipe 11, and the other port of the second hand valve switch is installed with a fifth air pipe 13.

[0025] In this embodiment, the third air pipe and the fourth air pipe are both bent pipes.

[0026] In this embodiment, the air pump, the pressure regulating valve, the glue making device, the first manual valve switch, and the second manual valve switch are all fixed on the frame 14.

[0027] In this embodiment, both ends of the first heating rod, the fixed glass tube and the second heating rod are fixed on the frame via mounting seats.

[0028] In this embodiment, a sixth gas tube 80 is installed at the upper end of the capillary glass tube, and a seventh gas tube 85 is installed at the lower end of the capillary glass tube. The sixth gas tube is connected to the third gas tube via the first gas tube joint 7, and the seventh gas tube is connected to the fourth gas tube via the second gas tube joint 10. The above parts together form a gas passage.

[0029] A method for manufacturing a silicone capillary tube based on gas injection molding, using a silicone capillary tube manufacturing device based on gas injection molding, comprising the following steps: (1) Close the pressure regulating valve 3 and the air pump 1, and open the first manual valve switch 5 and the second manual valve switch 12 to ensure that the air path is unobstructed; (2) Thermosetting silicone liquid is injected through the open port of the fifth air pipe 13. The silicone liquid passes through the second manual valve switch 12, the fourth air pipe 11, the second air pipe adapter 10, and the seventh air pipe 85 to reach the capillary glass tube until the silicone liquid 87 fills the capillary glass tube 81. Then, the injection of the silicone liquid 87 is stopped. (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; (4) Turn off the air pump 1, the pressure regulating valve 3, the first manual valve switch 5 and the second manual valve switch 12 to form a closed gas environment in the capillary glass tube 81, and then turn on the first heating rod 83 and the second heating rod 84 to heat and solidify the silicone liquid 87 remaining on the capillary glass tube 81; (5) After the heating is completed, the hollow silica gel capillary tube 88 is removed from the capillary glass tube 81.

[0030] In this embodiment, the wall thickness of the silicone capillary 88 can be controlled by adjusting the air pressure of the pressure regulating valve 3 as needed; or the outer diameter of the silicone capillary 88 can be controlled by adjusting the capillary glass tubes 81 with different inner diameters; or the length of the silicone capillary 88 can be controlled by adjusting the ventilation time.

[0031] Due to the influence of gravity, the silicone liquid 87 will settle in the capillary 81. The eccentric hollow silicone capillary 88 can also be obtained by placing the glue making device 8 horizontally and prolonging the curing time.

[0032] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, designing different forms of silicone capillary manufacturing devices based on gas injection molding does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A silicone capillary manufacturing device based on gas injection molding, characterized in that: It includes an air 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 includes a capillary glass tube for connecting the first hand valve switch and the second hand valve switch. A fixed glass tube is arranged outside the capillary glass tube. A first heating rod and a second heating rod for heating the fixed glass tube are correspondingly arranged on both sides of the fixed glass tube.

2. A silicone capillary manufacturing device based on gas injection molding according to claim 1, characterized in that: The air pump is connected to the pressure regulating valve via the first air pipe, the pressure regulating valve is connected to the first hand valve switch via the second air pipe, the first hand valve switch is connected to the glue making device via the third air pipe, and the glue making device is connected to one port of the second hand valve switch via the fourth air pipe.

3. The silicone capillary manufacturing device based on gas injection molding according to claim 2 is characterized in that: A fifth air pipe is installed at the other port of the second hand valve switch.

4. A silicone capillary manufacturing device based on gas injection molding according to claim 2 or 3, characterized in that: The third air pipe and the fourth air pipe are both bent pipes.

5. A silicone capillary manufacturing device based on gas injection molding according to claim 1, 2 or 3, characterized in that: 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 frame.

6. The silicone capillary manufacturing device based on gas injection molding according to claim 5, characterized in that: Both ends of the first heating rod, the fixed glass tube and the second heating rod are fixed on the frame via mounting seats.

7. A silicone capillary manufacturing device based on gas injection molding according to claim 2, 3 or 6, characterized in that: The upper end of the capillary glass tube is equipped with a sixth air tube, and the lower end of the capillary glass tube is equipped with a seventh air tube.

8. The silicone capillary manufacturing device based on gas injection molding according to claim 7, characterized in that: The sixth trachea is connected to the third trachea via a first trachea joint, and the seventh trachea is connected to the fourth trachea via a second trachea joint.

9. A method for manufacturing a silicone capillary tube based on gas injection molding, using a silicone capillary tube manufacturing device based on gas injection molding according to claim 1, 2, 3, 6 or 8, characterized in that: The following steps are involved: (1) Close the pressure regulating valve and air pump, open the first hand valve switch and the second hand valve switch to ensure that the gas path is unobstructed; (2) Inject thermosetting silicone liquid through the second hand valve switch until the silicone liquid reaches the capillary glass tube and stops injecting silicone liquid until the capillary glass tube is filled with the silicone liquid; (3) Turn on the air pump and the 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, the pressure regulating valve, the first manual valve switch and the second manual valve switch to form 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 completed, remove the hollow silicone capillary from the capillary glass tube.

10. The method for manufacturing a silicone capillary based on gas injection molding according to claim 9, characterized in that: According to the needs, adjust the air pressure of the pressure regulating valve to control the wall thickness of the silicone capillary; or adjust the capillary glass tubes with different inner diameters to control the outer diameter of the silicone capillary; or adjust the ventilation time to control the length of the silicone capillary; or place the glue making device horizontally and extend the curing time to obtain an eccentric hollow silicone capillary.

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