A vacuum positioning device for sealing quartz tubes

Abstract

This invention discloses a vacuum positioning device for sealing a quartz tube, comprising: a base; a quartz tube with an open top; a gas supply pipe assembly disposed on the base, the end of the gas supply pipe assembly being open and detachably sealed to the top of the quartz tube; a vacuum pumping connection assembly, branching and connected to the gas supply pipe assembly, one end of which is connected to a vacuum pumping device; a rotary drive mechanism for driving the quartz tube to rotate; and a quartz tube bottom clamping and speed-reducing mechanism for clamping and supporting the bottom of the quartz tube, and for reducing the rotational speed of the lower part of the quartz tube after sealing, so that the upper and lower parts of the quartz tube can be screwed shut. The quartz tube bottom clamping and speed-reducing mechanism of this invention clamps and supports the quartz tube, and can reduce the rotational speed of the lower part of the quartz tube after sealing, so that a speed difference is created between the upper and lower parts of the quartz tube, allowing the upper and lower parts of the quartz tube to be screwed shut.

Description

Technical Field

[0001] This invention relates to the field of gas encapsulation device technology, specifically to a vacuum positioning device for quartz tube sealing. Background Technology

[0002] Primary energy sources are characterized by "abundant coal, scarce oil, and limited gas," which determines that coal-fired power generation will remain dominant in the power structure for a considerable period. Improving the power generation efficiency of coal-fired power plants and reducing pollutant emissions have become critical issues that the power industry urgently needs to address. Developing boilers with high steam parameters (temperature and pressure) is the most effective way to improve the efficiency of coal-fired power generating units. The development of low-cost, high-performance high-temperature alloys for key boiler components is one of the core technologies and bottlenecks in realizing the A-USC unit power generation system, and experimental analysis of the alloys is an essential and indispensable step in alloy development.

[0003] After metal preparation, the metal samples (such as alloy samples, iron samples, and steel samples) need to be subjected to transmission electron microscopy (TEM) for high-end experimental analysis. However, there is a certain spatial distance between the sample preparation area and the experimental area. If the sample is in direct contact with the outside atmosphere after preparation, it is easily oxidized and corroded due to the presence of moisture and oxygen in the atmosphere. Therefore, the sample needs to be stored in a container before being transported to the experimental area. While samples can be directly placed in a container for storage and transportation, the presence of gas inside the container can cause partial oxidation of the sample surface, affecting the experimental analysis results. Therefore, the container needs to be vacuumed and sealed to facilitate sample storage and transportation. However, currently, there is no equipment available for vacuuming small components such as container tubes.

[0004] In addition, during the research and development stage of high-temperature alloys, it is inevitable to perform high-temperature homogenization, solution treatment and aging on the samples. Encapsulating the samples in a quartz tube can prevent them from coming into contact with other samples or other samples in the equipment and contaminating them. Further vacuum treatment of the samples can achieve high-temperature vacuum homogenization, solution treatment and aging.

[0005] However, when using quartz tubes for vacuum sealing, a person needs to hold the quartz tube by hand, and after sealing, the quartz tube still needs to be twisted by hand to seal it. The flame temperature used during sealing is relatively high, and twisting the quartz tube by hand can easily cause burns, posing a certain risk to personal safety. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the lack of equipment for vacuuming small-sized components such as container tubes and the problem of easy burns to the hands when manually twisting the quartz tube at the end of the sealing process, thereby providing a vacuum positioning device for sealing quartz tubes.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A vacuum positioning device for sealing quartz tubes includes:

[0009] Base;

[0010] Quartz tube with an open top;

[0011] A gas delivery pipe assembly is disposed on the base. The end of the gas delivery pipe assembly is open and is detachably and sealed to the top of the quartz tube by a snap-fit ​​assembly. The end of the gas delivery pipe assembly is rotatable, and when the quartz tube is connected to the end of the gas delivery pipe assembly, the end of the gas delivery pipe assembly can rotate synchronously with the quartz tube.

[0012] A vacuum pumping connection assembly is provided on the gas supply pipe assembly, with one end connected to a vacuum pumping device. The vacuum pumping connection assembly can control whether to evacuate the inside of the quartz tube.

[0013] A rotary drive mechanism is used to drive the quartz tube to rotate;

[0014] A quartz tube bottom clamping speed reduction mechanism is located below the quartz tube. It is used to clamp and support the bottom of the quartz tube and can reduce the rotation speed of the lower part of the quartz tube after the quartz tube is melt-sealed, so that the upper and lower parts of the quartz tube can be twisted to seal.

[0015] Optionally, the snap-fit ​​component includes:

[0016] Clamps are used to connect the quartz tube to the end opening of the gas pipeline assembly;

[0017] A sealing ring is provided at the end opening of the quartz tube and the gas transmission pipe assembly.

[0018] Optionally, the gas pipeline assembly includes:

[0019] The first air passage pipe is vertically fixed on the base;

[0020] The second air passage is vertically installed and connected to the first air passage via a flexible hose. The middle part of the second air passage is positioned on the support plate by a positioning component.

[0021] Optionally, the second air passage is divided into a fixed section and a rotating section, with the rotating section being sealed and rotatably positioned below the fixed section; a rotation drive mechanism is provided on the support plate, which is used to drive the rotating section to rotate.

[0022] Optionally, the rotary drive mechanism includes:

[0023] First motor;

[0024] A speed reducer, connected to the output shaft of the first motor, is mounted on the support plate;

[0025] The belt connection assembly is connected at one end to the output shaft of the reducer and at the other end to position the rotating tube section, and is used to drive the quartz tube to rotate when the first motor rotates.

[0026] Optionally, the belt connection assembly includes:

[0027] The first pulley is connected to the output shaft end of the reducer;

[0028] The connecting shaft is located at the bottom end of the support plate;

[0029] The second pulley is positioned on the connecting shaft.

[0030] Optionally, the quartz tube bottom clamping and deceleration mechanism includes:

[0031] The positioning shaft is rotatably mounted on a bearing seat fixed to the base via a bearing at its bottom end, and is clamped and positioned with the quartz tube at its top end; the rotation direction of the positioning shaft is the same as or opposite to the rotation direction of the rotating section of the second air passage pipe.

[0032] The positioning shaft speed reduction assembly is used to reduce the rotation speed of the positioning shaft after the quartz tube is sealed, so that the upper and lower parts of the quartz tube rotate at different speeds, thereby achieving the purpose of twisting the quartz tube to seal it.

[0033] Optionally, the positioning shaft speed reduction assembly includes:

[0034] Shaft;

[0035] The second motor is connected to the bottom end of the rotating shaft;

[0036] A motor mount is located at the bottom of the second motor;

[0037] A drive gear is mounted on the rotating shaft;

[0038] The driven gear is mounted on the positioning shaft and can mesh with or disengage from the driving gear;

[0039] The cylinder has its piston rod end fixed to the motor base, and its fixed end is fixedly mounted on the base. The cylinder is used to push the motor base, the second motor, the rotating shaft and the drive gear to move towards the drive gear side after the quartz tube is melt-sealed, so as to reduce the rotational speed of the positioning shaft.

[0040] Optionally, a pressure gauge capable of detecting the internal pressure of the quartz tube is installed on the second air passage.

[0041] Optionally, the vacuum pumping connection assembly includes:

[0042] A vacuum extraction pipe is branched and connected to the gas delivery pipe assembly; one end of the vacuum extraction pipe is connected to a vacuum extraction device.

[0043] A vacuum valve is installed on the vacuum extraction pipe to control the opening and closing of the vacuum extraction pipe.

[0044] The technical solution of this invention has the following advantages:

[0045] 1. This invention provides a vacuum positioning device for sealing quartz tubes. Simply place the sample to be tested into the quartz tube, then position the tube using a snap-fit ​​assembly. A vacuum pump can then be used for vacuuming, facilitating subsequent quartz tube sealing. Sealing and vacuuming are performed simultaneously. This invention offers easier positioning of the quartz tube, simple vacuuming operation, low cost, and high efficiency. It can be used in conjunction with a sealing device to achieve vacuum sealing of the quartz tube, facilitating the storage, transportation, and high-temperature heating of the sample inside the tube. This effectively avoids the problem of easy oxidation and corrosion of the sample, ensuring the effectiveness of experimental analysis.

[0046] Furthermore, the present invention also includes a bottom clamping and speed-reducing mechanism for the quartz tube. This mechanism clamps and supports the quartz tube and reduces the rotation speed of the lower part of the quartz tube after the quartz tube is sealed, thereby creating a speed difference between the upper and lower parts of the quartz tube. This allows the upper and lower parts of the quartz tube to be twisted to seal the tube, enabling the quartz tube to twist automatically. This avoids the problem of burns to the hands caused by manually twisting the quartz tube after the quartz tube is sealed.

[0047] 2. The present invention provides a vacuum positioning device for sealing quartz tubes. The device is simple, efficient, and low in cost, and can be used for testing without the need for expensive experimental platforms.

[0048] 3. The present invention provides a vacuum positioning device for sealing quartz tubes. The second gas path is divided into a fixed section and a rotating section. The rotating section is rotatably positioned below the fixed section and rotatably positioned inside the positioning sleeve. A rotation drive mechanism is provided on the support plate. The rotation drive mechanism positions the quartz tube and drives the container tube to rotate during the sealing of the quartz tube, thereby cooperating with the sealing machine to achieve the sealing of the quartz tube.

[0049] 4. The present invention provides a vacuum positioning device for sealing quartz tubes, wherein a pressure gauge is also provided on the second gas line. The pressure gauge can detect the internal pressure of the quartz tube and thus determine whether the internal pressure of the quartz tube is within the normal pressure range, thereby avoiding excessive pressure inside the quartz tube.

[0050] 5. The present invention provides a vacuum positioning device for sealing quartz tubes. After the quartz tube sealing is completed, the piston rod of the cylinder extends, pushing the motor base, the second motor, the rotating shaft, and the driving gear to move towards the driven gear side, thereby reducing the rotational speed of the positioning shaft and consequently reducing the rotational speed at the bottom of the quartz tube, resulting in a mismatch between the rotational speeds of the top and bottom of the quartz tube. Furthermore, the second motor drives the rotating shaft to rotate, which in turn drives the driving gear to rotate. At this time, the rotational direction of the driving gear is opposite to that of the driven gear. When the driving gear collides with the driven gear, it reduces the rotational speed of the driven gear. When the rotational speed of the driven gear decreases to a certain level, the driving gear will eventually drive the driven gear to rotate, thus achieving a twisting effect caused by the mismatched rotational speeds of the upper and lower parts of the quartz tube. Attached Figure Description

[0051] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of a vacuum positioning device for sealing quartz tubes according to the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of a vacuum positioning device for sealing quartz tubes according to the present invention during the positioning of the quartz tube.

[0054] Figure label:

[0055] 1. Base, 2. First air passage pipe, 3. Vacuum extraction pipe, 4. Air outlet, 5. Vacuum pump, 6. Vacuum valve, 7. First motor, 8. Reducer, 9. Speed ​​regulator, 10. Drive belt, 11. Pressure gauge, 12. Hose, 13. Quartz tube, 14. Clamp, 15. Port, 16. Support plate, 17. First pulley, 18. Second pulley, 19. Connecting shaft, 20. Second air passage pipe, 21. Positioning sleeve, 22. Quartz tube positioning clamp, 23. Positioning shaft, 24. Driven gear, 25. Bearing, 26. Bearing housing, 27. Rotating shaft, 28. Drive gear, 29. Second motor, 30. Motor housing, 31. Cylinder, 32. Cylinder positioning plate. Detailed Implementation

[0056] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] like Figure 1 and Figure 2 A specific embodiment of a vacuum positioning device for sealing a quartz tube is shown, comprising a base 1, a gas supply pipe assembly, a quartz tube, a snap-fit ​​assembly, a vacuum pumping connection assembly, and a bottom clamping and deceleration mechanism for the quartz tube.

[0061] A gas delivery pipe assembly is mounted on the base 1. The end of the gas delivery pipe assembly is open and detachably and sealed to the quartz tube via a snap-fit ​​assembly. A vacuum pumping connection assembly is branched onto the gas delivery pipe assembly, with one end connected to a vacuum pumping device. The vacuum pumping connection assembly controls whether a vacuum is evacuated inside the quartz tube. The end of the gas delivery pipe assembly is rotatable; when the quartz tube is connected to the end of the gas delivery pipe assembly, the end of the gas delivery pipe assembly rotates synchronously with the quartz tube.

[0062] The quartz tube 13 contains the sample to be tested. A vacuum positioning device is connected to the inside of the quartz tube and is used to position the quartz tube. A vacuum pumping device is connected to the vacuum pumping connection assembly and is used to evacuate the quartz tube.

[0063] The rotary drive mechanism is used to drive the quartz tube to rotate, thereby ensuring that the flame ejected from the sealing device acts evenly on the quartz tube.

[0064] When the quartz tube is fully sealed, it is usually necessary for a person to hold the quartz tube and then twist it. If the quartz tube is too short, it will be difficult for the person to hold it. To address this, the present invention provides a bottom clamping and deceleration mechanism for the quartz tube, which is used to clamp and support the bottom of the quartz tube.

[0065] The aforementioned vacuum positioning device for sealing quartz tubes can clamp and position the quartz tube using a snap-fit ​​assembly, followed by direct vacuuming using a vacuum pumping device, facilitating subsequent quartz tube sealing. Furthermore, during the sealing process, the vacuum pumping device continuously evacuates the gas delivery pipe assembly and the quartz tube, maintaining them in a constant vacuum state. This invention facilitates quartz tube positioning, simplifies vacuuming, reduces cost, and increases efficiency. It can be used in conjunction with a sealing device to achieve vacuum sealing of the quartz tube, enabling the storage and transportation of the test sample within the tube. This effectively avoids the problem of easy oxidation and corrosion of the test sample, ensuring the effectiveness of experimental analysis. Furthermore, the present invention also includes a bottom clamping and speed-reducing mechanism for the quartz tube. This mechanism clamps and supports the quartz tube and reduces the rotation speed of the lower part of the quartz tube after the quartz tube is sealed, allowing the upper and lower parts of the quartz tube to be twisted to seal the tube. This enables the quartz tube to twist automatically, thus avoiding the problem of burns to the hands caused by manually twisting the quartz tube after the quartz tube is sealed.

[0066] Furthermore, the quartz tube bottom clamping and deceleration mechanism in this invention can support the bottom of the quartz tube, which can avoid the problem of poor airtightness between the test tube and the gas delivery pipe assembly caused by the heavy weight of the sample to be tested inside the test tube. That is, when the bottom of the quartz tube is supported, the quartz tube pulls the clamping component between the quartz tube and the gas delivery pipe assembly due to gravity, thereby ensuring the airtightness of the quartz tube during the fusion sealing process.

[0067] The snap-fit ​​assembly includes a clamp 14 and a sealing ring. The clamp 14 is used to connect the quartz tube to the end opening of the gas pipeline assembly.

[0068] The sealing ring is placed at the end opening of the quartz tube and the gas pipeline assembly to provide a good seal.

[0069] The base 1 is flat. Made of metal, it has a certain weight to ensure the stability of the device during operation. Four mounting holes are located at the four corners of the base for positioning the entire device.

[0070] The gas supply pipe assembly is mounted on the base 1, and the end of the gas supply pipe assembly is open for vacuuming operations.

[0071] One end of the quartz tube is open and sealed to the end opening of the gas delivery tube assembly for holding the sample to be tested. The open end of the quartz tube is connected to the end opening of the gas delivery tube assembly.

[0072] The vacuum pumping connection assembly is branched onto the gas supply pipe assembly and connected to the vacuum pumping device. The vacuum pumping connection assembly is used to evacuate the inside of the quartz tube.

[0073] This invention simply requires placing the sample inside a quartz tube, after which a vacuuming operation can be performed. The equipment is simple, efficient, low-cost, and has a wide applicable temperature range, enabling various ultra-high temperature tests. It has a wide range of uses and can achieve effective vacuum sealing of samples.

[0074] Furthermore, the gas supply pipe assembly includes a first gas pipe 2, a second gas pipe 20, and a hose 12. The first gas pipe 2 is vertically fixed to the base 1 by welding. The second gas pipe 20 is vertically continuous and connected to the first gas pipe 2 via the hose 12. The middle part of the second gas pipe 20 is positioned on the support plate 16 by a positioning component, and the end of the second gas pipe 20 is provided with a port 15.

[0075] As an improved implementation, the port 15 is more than 5cm from the edge of the base, making it suitable for quartz tubes of various lengths.

[0076] The first air passage pipe 2 is made of stainless steel, which is corrosion-resistant. Alternatively, other corrosion-resistant materials can also be used. Similarly, the second air passage pipe 20 can also be made of stainless steel, which is corrosion-resistant.

[0077] The positioning assembly includes a positioning sleeve 21, which is fixedly mounted on the support plate 16. The center of the positioning sleeve 21 is hollow. The second air passage 20 passes through the inside of the positioning sleeve 21, and the positioning sleeve 21 provides a good guide for the second air passage 20.

[0078] As an improved implementation, the quartz tube has a wall thickness of 5 mm and undergoes annealing at 1100℃ for 4 hours, followed by furnace cooling to enhance its strength and ensure it does not crack during transportation or solution treatment. The quartz tube used in this embodiment can be used at any temperature from room temperature to 1100℃, thus avoiding the problems of experimental devices being unable to withstand high temperatures and having a limited temperature range.

[0079] More specifically, the quartz tube is connected to the port 15 of the second air passage pipe 20 by means of a clamp, and a sealing ring is provided between the quartz tube and the second air passage pipe 20, which can achieve a good sealing effect.

[0080] As an improved implementation, the second gas passage 20 is divided into a fixed section and a rotating section. The rotating section is rotatably and sealed below the fixed section, and is rotatably mounted inside the positioning sleeve 21 via a bearing. A rotary drive mechanism is provided on the support plate 16. The rotary drive mechanism is used to position the quartz tube and drive the container tube to rotate during the sealing of the quartz tube, thereby cooperating with the sealing machine to achieve the sealing of the quartz tube.

[0081] The rotary drive mechanism includes a first motor 7, a reducer 8, and a belt connection assembly. The reducer 8 is connected to the output shaft of the first motor 7 and is mounted on the support plate 16. One end of the belt connection assembly is connected to the output shaft of the reducer 8, and the other end is connected to the rotating tube section to position the quartz tube and drive the quartz tube to rotate when the first motor 7 rotates.

[0082] The belt connection assembly includes a first pulley 17, a second pulley 18, a transmission belt 10, and a connecting shaft 19. The first pulley 17 is connected to the output shaft end of the reducer 8, and the connecting shaft 19 is connected to the bottom end of the support plate 16. The second pulley 18 is positioned on the connecting shaft 19. The connecting shaft 19 is hollow inside. In this embodiment, the rotating tube section is positioned on the inner ring of the bearing, and the rotating tube section is located inside the connecting shaft 19 through the bearing. That is, in this embodiment, the first motor 7 can drive the first pulley 17 to rotate, which in turn drives the second pulley 18 to rotate through the transmission belt 10. When the second pulley 18 rotates, it can drive the rotating tube section and the quartz tube to rotate.

[0083] Furthermore, in this embodiment, the support plate 16 is also equipped with a speed regulator 9, which is used to adjust and control the speed of the first motor 7, thereby adjusting the rotational speed of the quartz tube when it rotates. The speed regulator is equipped with a speed control panel, which is convenient for operators to operate to control the rotational speed of the motor.

[0084] In this embodiment, the motor, reducer, and speed controller are located on the same plane and placed on the support plate 16.

[0085] The vacuum pumping connection assembly in this embodiment includes a vacuum pumping pipe 3 and a vacuum valve 6. The vacuum pumping pipe 3 has branches connected to the gas delivery pipe assembly, and one end of the vacuum pumping pipe is connected to a vacuum pumping device, which is a vacuum pump 5. The end of the vacuum pumping pipe is designated as an outlet 4. The vacuum valve 6 is mounted on the vacuum pumping pipe and is a one-way valve. The vacuum valve 6 is used to control the opening and closing of the vacuum pumping pipe 3.

[0086] As an improved implementation, a pressure gauge 11 is also provided on the second gas line 20. The pressure gauge 11 can detect the internal pressure of the quartz tube and thus determine whether the internal pressure of the quartz tube is within the normal pressure range. The value of the pressure gauge can be used to determine whether the internal pressure of the quartz tube is in a vacuum state.

[0087] As an improved implementation, the quartz tube bottom clamping speed reduction mechanism includes a positioning shaft 23, a bearing 25, a bearing seat 26, and a positioning shaft speed reduction assembly.

[0088] The bottom end of the positioning shaft 23 is rotatably mounted on the bearing seat 26 via the bearing 25, and the top end is positioned and clamped to the quartz tube via the quartz tube positioning clamp 22. The bottom end of the bearing seat 26 is fixed to the base 1. Furthermore, a groove is provided at the top end of the positioning shaft 23, and the quartz tube is inserted into the groove for positioning.

[0089] In this invention, the rotation direction of the positioning shaft 23 is the same as or opposite to the rotation direction of the rotating section of the second air passage pipe 20. When the positioning shaft deceleration component is not acting on the positioning shaft, the rotation direction of the positioning shaft 23 is the same as the rotation direction of the rotating section of the second air passage pipe 20, and the quartz tube is in a normal rotation state. After the sealing is completed, when the positioning shaft deceleration component acts on the positioning shaft, it causes the positioning shaft to decelerate, and then drives the positioning shaft 23 to rotate in the opposite direction to the rotation direction of the rotating section of the second air passage pipe 20. At this time, the lower part of the quartz tube rotates in the opposite direction to the upper part of the quartz tube, thereby enabling the quartz tube to achieve an automatic twisting sealing effect.

[0090] The positioning shaft speed reduction assembly is used to reduce the rotation speed of the positioning shaft 23 after the quartz tube is sealed, so that the upper and lower parts of the quartz tube rotate at different speeds, thereby achieving the purpose of tightening the quartz tube to seal it.

[0091] More specifically, the positioning shaft speed reduction assembly includes a rotating shaft 27, a second motor 29, a motor base 30, a drive gear 28, a driven gear 24, and a cylinder 31.

[0092] The second motor 29 is connected to the bottom end of the rotating shaft 27. The motor mount 30 is located at the bottom end of the second motor 29. The driving gear 28 is mounted on the rotating shaft 27. The driven gear 24 is mounted on the positioning shaft 23 and can mesh or disengage with the driving gear 28.

[0093] The piston rod end of cylinder 31 is fixed to motor base 30, and the fixed end of cylinder 31 is fixedly mounted on base 1. Specifically, in this invention, the fixed end of cylinder 31 is fixedly mounted on cylinder positioning plate 32, and cylinder positioning plate 32 is fixedly mounted on base 1. When the quartz tube begins to be melt-sealed, the cylinder drives motor base 30, second motor 29, rotating shaft 27, and driving gear 28 away from driven gear 24, so that positioning shaft 23 can rotate under the drive of belt connection assembly. After the quartz tube is melt-sealed, the piston rod of cylinder extends, pushing motor base 30, second motor 29, rotating shaft 27, and driving gear 28 to move towards driven gear 24, thereby reducing the rotational speed of positioning shaft 23, and thus reducing the rotational speed of the bottom of quartz tube, so that the rotational speed of the top of quartz tube is inconsistent with the rotational speed of the bottom. Furthermore, the second motor 29 drives the rotating shaft 27 to rotate, and the rotating shaft drives the driving gear 28 to rotate. At this time, the rotation direction of the driving gear 28 is opposite to the rotation direction of the driven gear 24. When the driving gear 28 collides with the driven gear 24, it will reduce the speed of the driven gear 24. When the speed of the driven gear 24 is reduced to a certain level, the driving gear 28 will drive the driven gear 24 to rotate, thereby achieving the effect of twisting due to the different speeds of the upper and lower parts of the quartz tube.

[0094] Because the present invention is equipped with a quartz tube bottom clamping and speed reduction mechanism, the flame gun in the sealing device does not need to be held by a person and can be placed directly on the fixed plate.

[0095] The vacuum sealing process for the quartz tube in this invention is as follows:

[0096] S1. Preparations:

[0097] Place the sample in an oven for 60-100 minutes at a temperature of 80℃.

[0098] Annealing treatment of quartz tubes: The quartz tubes are annealed by heating them to 1100℃ and holding them at that temperature for 4 hours, and then cooling them in the furnace to enhance their strength and pressure resistance, ensuring that the quartz tubes will not break during transportation.

[0099] Check if the device connection is correct, and load the sample to be tested into the prepared quartz tube. When positioning the quartz tube, the present invention can directly connect the quartz tube with the opening facing upward to the bottom end of the second gas passage pipe 20, and set a sealing ring between the quartz tube and the second gas passage pipe 20. Then, clamp the quartz tube and the second gas passage pipe 20 to make a sealed connection.

[0100] S2. Install and position the bottom end of the quartz tube onto the positioning shaft 23. At this time, the positioning shaft deceleration assembly is disengaged from the positioning shaft.

[0101] S3. Perform a vacuuming operation on the quartz tube:

[0102] Turn on the vacuum pump and vacuum valve 6 to evacuate the gas delivery pipe assembly and quartz tube by the vacuum pump, so as to remove the gas in the gas delivery pipe assembly and quartz tube that the vacuum pump has blocked.

[0103] During the vacuuming process, pressure gauge 11 displays the pressure inside the quartz tube. The reading on pressure gauge 11 indicates whether the required vacuum state has been reached inside the quartz tube; a negative pressure reading on the gauge indicates that the quartz tube has reached a vacuum state.

[0104] S4. Begin sealing:

[0105] Turn on the motor switch and adjust the rotation speed of the quartz tube on the adjustment panel. The first motor 7 drives the first pulley 17, the transmission belt 10, the second pulley 18, and the rotating section of the second air passage pipe to rotate, thereby driving the quartz tube to rotate.

[0106] Start the sealing machine to begin gas production, adjust the gas flow rate, open the flame gun valve, and begin igniting the flame gun. After ignition, bring the flame gun close to the quartz tube, mount the flame gun on the fixed plate, and begin the sealing process for the quartz tube. Vacuum is continuously evacuated during the sealing process.

[0107] When the quartz tube needs to be twisted to seal it, the second motor 29 starts, the piston rod of the cylinder 31 extends, and drives the driving gear 28 to move towards the driven gear 24. Since the driving gear 28 and the driven gear 24 rotate in opposite directions at this time, the driving gear 28 can reduce the speed of the driven gear 24, so that the speed of the upper and lower parts of the quartz tube are inconsistent, causing the quartz tube to automatically twist and seal.

[0108] S5. Sealing complete:

[0109] Turn off the flame gun valve to shut off the flame, stop the gas production of the sealing machine, and shut down the sealing machine. Turn off the motor switch and the vacuum pump. After the quartz tube has reached room temperature, check its airtightness.

[0110] S6. Store and transport the quartz tube containing the sample to be tested.

[0111] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A vacuum positioning device for sealing quartz tubes, characterized in that, include: Base (1); Quartz tube with an open top; A gas delivery pipe assembly is disposed on the base (1). The end of the gas delivery pipe assembly is open and is detachably and sealed to the top of the quartz tube by a snap-fit ​​assembly. The end of the gas delivery pipe assembly is rotatable. When the quartz tube is connected to the end of the gas delivery pipe assembly, the end of the gas delivery pipe assembly can rotate synchronously with the quartz tube. A vacuum pumping connection assembly is provided on the gas supply pipe assembly, with one end connected to a vacuum pumping device. The vacuum pumping connection assembly can control whether to evacuate the inside of the quartz tube. A rotary drive mechanism is used to drive the quartz tube to rotate; A quartz tube bottom clamping speed reduction mechanism is located below the quartz tube to clamp and support the bottom of the quartz tube, and can reduce the rotation speed of the lower part of the quartz tube after the quartz tube is melt-sealed, so that the upper and lower parts of the quartz tube can be twisted to seal. The bottom clamping and deceleration mechanism of the quartz tube includes: The positioning shaft (23) is rotatably mounted on the bearing seat (26) fixed to the base (1) via the bearing (25) at its bottom end, and is clamped and positioned with the quartz tube at its top end; the rotation direction of the positioning shaft (23) is the same as or opposite to the rotation direction of the rotating pipe section of the gas transmission pipe assembly. The positioning shaft speed reduction assembly is used to reduce the rotation speed of the positioning shaft (23) after the quartz tube is sealed, so that the upper and lower parts of the quartz tube rotate at different speeds, thereby achieving the purpose of twisting the quartz tube to seal the end. The positioning shaft speed reduction assembly includes: Rotating shaft (27); The second motor (29) is connected to the bottom end of the rotating shaft (27); The motor mount (30) is located at the bottom of the second motor (29); A drive gear (28) is mounted on the rotating shaft (27); Driven gear (24) is mounted on the positioning shaft (23) and can mesh or disengage with the driving gear (28); The cylinder (31) has its piston rod end fixed to the motor base (30), and its fixed end is fixedly mounted on the base (1). The cylinder (31) is used to push the motor base (30), the second motor (29), the rotating shaft (27) and the drive gear (28) to move towards the drive gear (28) after the quartz tube is sealed, so as to reduce the rotation speed of the positioning shaft (23). The snap-fit ​​assembly includes: Clamp (14) is used to connect the quartz tube to the end opening of the gas pipeline assembly; A sealing ring is provided at the end opening of the quartz tube and the gas transmission pipe assembly.

2. The vacuum positioning device for sealing quartz tubes according to claim 1, characterized in that, The gas pipeline assembly includes: The first air passage pipe (2) is vertically fixed on the base (1); The second air passage (20) is vertically installed and connected to the first air passage (2) via a hose (12). The middle part of the second air passage (20) is positioned on the support plate (16) by a positioning component.

3. The vacuum positioning device for sealing quartz tubes according to claim 2, characterized in that, The second air passage (20) is divided into a fixed section and a rotating section, with the rotating section being sealed and rotated below the fixed section; the rotating drive mechanism is mounted on the support plate (16), and the rotating drive mechanism is used to drive the rotating section to rotate.

4. The vacuum positioning device for sealing quartz tubes according to claim 3, characterized in that, The rotary drive mechanism includes: First motor (7); The reducer (8) is connected to the output shaft of the first motor (7) and is mounted on the support plate (16); The belt connection assembly is connected at one end to the output shaft of the reducer (8) and at the other end to position the rotating tube section, and is used to drive the quartz tube to rotate when the first motor (7) rotates.

5. A vacuum positioning device for sealing quartz tubes according to claim 4, characterized in that, The belt connection assembly includes: The first pulley (17) is connected to the output shaft end of the reducer (8); The connecting shaft (19) is connected to the bottom end of the support plate (16); The second pulley (18) is positioned on the connecting shaft (19).

6. A vacuum positioning device for sealing quartz tubes according to claim 2, characterized in that, The second air passage (20) is equipped with a pressure gauge (11) that can detect the internal pressure of the quartz tube.

7. The vacuum positioning device for sealing quartz tubes according to claim 1, characterized in that, The vacuum pumping connection assembly includes: A vacuum extraction pipe (3) is branched and connected to the gas delivery pipe assembly; one end of the vacuum extraction pipe is connected to a vacuum extraction device. A vacuum valve (6) is installed on the vacuum extraction pipe (3) to control the opening and closing of the vacuum extraction pipe (3).

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