Automatic sealing device for inner tube and outer tube of glass tube

Abstract

The utility model belongs to the technical field of glass hot working devices, and particularly discloses an automatic sealing device for an inner tube and an outer tube of a glass tube, which comprises a sealing mechanism, a fire head assembly and a graphite mold collision valve mechanism, the sealing mechanism comprises a conveying line used for receiving and conveying the glass tube, and the fire head assembly is arranged on one side of the conveying line. A graphite mold collision valve mechanism is arranged at the position close to the melting fire head and comprises a plurality of graphite mold collision valves, the graphite mold collision valves can move front and back to be close to or away from the glass tube, and a plurality of rotary grabbing tubes are arranged on the other side of the conveying line and opposite to the graphite mold collision valves. The rotary grabbing pipe and the graphite mold collision valve can rotate synchronously and clamp the two ends of the glass pipe in a matched mode to enable the pipe opening of the to-be-sealed end of the glass pipe to rotate synchronously above the melting fire head for heating and sealing, accurate positioning of the glass pipe, the fire head and the graphite mold collision valve is guaranteed, sealing quality is improved, streamlined production is achieved, and production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of glass heat processing equipment, and specifically discloses an automatic sealing device for the inner and outer tubes of a glass tube. Background Technology

[0002] Vacuum glass collector tubes are the core component of solar water heaters. A crucial step in their production is sealing the inner and outer ends of the glass tube using an automatic sealing machine. During sealing, a mixture of natural gas and oxygen is burned to heat and melt the inner and outer ends of the glass tube. A graphite mold then impacts the inner and outer ends of the glass tube, fusing them together. The automatic sealing machine is fast and efficient. During operation, the positioning of the glass tube and the burner head in each cycle, the positioning of the glass tube and the graphite mold valve, the burner head angle, temperature, and time of combustion, and the number and force of the impacts of the graphite mold on the glass tube all significantly affect the sealing effect.

[0003] The accuracy and stability of the glass tube opening positioning is the key foundation of the automatic sealing machine process requirements, which directly determines the product qualification rate and natural gas energy consumption. Traditional automatic sealing machines have the following disadvantages when the glass tube is positioned and sealed on the conveyor chain during sealing operations: (1) After long-term use, changes in the tension and wear of the conveyor chain cause mechanical errors in the front and rear lateral directions after the glass tube is conveyed to the position, resulting in inaccurate positioning of the glass tube opening and the flame position, as well as the position of the graphite mold valve. (2) The glass tube is in a self-rotating state on the conveyor chain. During the walking and running of the conveyor chain, vertical cross-contamination of the tube is likely to occur, resulting in inaccurate positioning of the glass tube opening and the flame position, as well as the position of the graphite mold valve. If the glass tube opening is not accurately positioned relative to the flame, the glass tube opening will not melt to meet the process requirements. When the graphite mold is used to seal the glass tube opening, leaks, inward and outward turning of the seal, and air bubbles may appear during the fusion of the sealed glass. If the glass tube opening is not accurately positioned relative to the graphite mold, the seal may burst or leak when the graphite mold is used to seal the glass tube opening due to incorrect positioning. Summary of the Invention

[0004] To address the problems in the background art, this utility model discloses an automatic sealing device for the inner and outer tubes of a glass tube, which also includes a sealing mechanism, a flame assembly, and a graphite mold valve mechanism. This ensures the precise positioning of the glass tube, the flame, and the graphite mold valve, improves the sealing quality, enables streamlined production, and increases production efficiency.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] An automatic sealing device for inner and outer tubes of a glass tube includes a conveying mechanism for conveying the glass tube, a sealing mechanism, a flame assembly, and a graphite mold valve mechanism. The sealing mechanism includes a conveyor line for receiving and conveying the glass tube. A flame assembly is arranged on one side of the conveyor line, and the flame assembly includes several melting flames spaced apart along the conveying direction of the conveyor line. The melting flames are used to heat the end of the glass tube to be sealed. A graphite mold valve mechanism is arranged near the melting flames, and the graphite mold valve mechanism includes several graphite mold valves that can move back and forth to approach or move away from the glass tube. On the other side of the conveyor line, several rotating grippers are arranged opposite to the graphite mold valves. Under the control of a control center, the rotating grippers and the graphite mold valves can rotate synchronously and cooperate to clamp both ends of the glass tube, so that the end of the glass tube to be sealed is synchronously rotated and heated above the melting flames for sealing.

[0007] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube, the graphite mold impact valve mechanism, also includes a base and a movable seat. A guide rail is provided on the base, perpendicular to the conveyor line. The movable seat is slidably connected to the guide rail via a slider. Several graphite mold impact valves extending towards the melting flame are provided on the movable seat. Each graphite mold impact valve is rotatably connected to the movable seat via a mold shaft rotation drive shaft. Under the action of the impact valve cylinder, the movable seat can drive the graphite mold impact valves to move back and forth, approaching or moving away from the glass tube. Under the action of the rotation motor and the mold shaft rotation drive shaft, the graphite mold impact valves can rotate relative to the movable seat.

[0008] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube includes a rotating gripper that faces the conveyor line. The rotating gripper is rotatably connected to a mounting base located on one side of the conveyor line. Several grippers for holding the glass tube are spaced apart on the side of the rotating gripper facing the conveyor line. Several air nozzles for blowing air between the inner and outer tubes of the glass tube are located in the middle of the rotating gripper. The air nozzles are controlled to start and stop by an air blowing valve.

[0009] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube is provided with rotating lifting plates on both sides of the conveyor line. The rotating lifting plate includes a lifting seat that can be raised and lowered and several rollers that are spaced apart along the axial direction of the conveyor line on the lifting seat. The rollers are rotatably connected to the lifting seat. Under the action of the control center, the lifting seat can drive the rollers to rise relative to the conveyor line to lift the glass tube or descend relative to the conveyor line to drop the glass tube onto the conveyor line.

[0010] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube has a number of preheating heads spaced apart in the material feeding direction of the melting head, and a number of annealing heads spaced apart in the material discharging direction of the melting head. The preheating heads, melting heads, and annealing heads are arranged sequentially along the feeding direction of the conveyor line, and the number of the preheating heads, melting heads, annealing heads, and rotating tube grippers is the same.

[0011] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube includes a transplanting mechanism between the conveying mechanism and the conveying line. The transplanting mechanism includes a transplanting guide rail extending along the axial direction of the conveying line. A transplanting seat is slidably connected to the transplanting guide rail via a transplanting slider. The height of the transplanting seat is lower than the height of the conveying mechanism and the conveying line. At both ends of the transplanting seat, a support block is connected to a vertically arranged lifting cylinder. Under the action of the transplanting seat and the lifting cylinder, the support block can approach the conveying mechanism and rise to lift the glass tube conveyed by the conveying mechanism, or approach the conveying line and descend relative to the conveying line to drop the glass tube onto the conveying line.

[0012] Furthermore, the automatic sealing device for the inner and outer tubes of the glass tube is equipped with a baffle that is parallel to the conveyor line in the material feeding direction of the preheating head.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model relates to an automatic sealing device for inner and outer tubes of glass tubes, comprising a sealing mechanism, a flame assembly, and a graphite mold valve mechanism. The sealing mechanism includes a conveyor line for receiving and transporting the glass tubes. A flame assembly is arranged on one side of the conveyor line, comprising several melting flames spaced apart along the conveying direction of the conveyor line. A graphite mold valve mechanism is arranged adjacent to the melting flames, comprising several graphite mold valves that can move back and forth to approach or move away from the glass tubes. On the other side of the conveyor line, several rotating grippers are arranged opposite to the graphite mold valves. Under the control of the control center, the rotating grippers and the graphite mold valves can rotate synchronously and cooperate to clamp both ends of the glass tube, so that the end of the glass tube to be sealed is synchronously heated and sealed above the melting flames. This ensures the precise positioning of the glass tube, the flames, and the graphite mold valves, improves the sealing quality, realizes streamlined production, and improves production efficiency. Attached Figure Description

[0015] Figure 1 This is a top view of the automatic sealing device of this utility model;

[0016] Figure 2 This is a schematic diagram of the sealing mechanism in this utility model;

[0017] Figure 3 This is a schematic diagram of the graphite mold impact valve mechanism in this utility model;

[0018] Figure 4 This is a schematic diagram of the transplanting mechanism in this utility model;

[0019] Figure 5 This is a schematic diagram of the conveying mechanism in this utility model;

[0020] Figure 6 This is a comparison image of the inner and outer tubes of the glass tube before and after sealing in this utility model;

[0021] In the above diagram: 1-glass tube; 2-sealing mechanism; 2.1-air blowing valve; 2.2-rotating tube gripper; 2.3-rotating platform; 2.4-conveyor line; 2.5-baffle; 3-burner assembly; 3.1-preheating burner; 3.2-melting burner; 3.3-annealing burner; 4-air source; 5-graphite mold impact valve mechanism; 5.1-graphite mold impact valve; 5.2-slider; 5.3-impact valve cylinder; 5.4-rotating motor; 5.5-mold shaft rotation drive shaft; 6-control center; 7-transfer mechanism; 7.1-transfer slider; 7.2-lifting cylinder; 7.3-transfer cylinder; 7.4-support block; 8-conveyor mechanism; 8.1-conveyor chain; 8.2-conveyor motor. Detailed Implementation

[0022] To better understand this utility model, the following embodiments further illustrate its content. However, the content of this utility model is not limited to the following embodiments. It should be noted that the innovation of this utility model is the mechanical structure of the automatic sealing device for the inner and outer tubes of the glass tube. During operation, the control system of the control center of this utility model is not the innovation of this utility model. Therefore, the control center will not be described in detail in this utility model.

[0023] Combined with appendix Figure 1-6 This invention details an automatic sealing device for the inner and outer tubes of a glass tube, comprising a conveying mechanism 8 for conveying the glass tube 1, a sealing mechanism 2, a flame assembly 3, and a graphite mold valve mechanism 5. The sealing mechanism 2 includes a conveying line 2.4 for receiving and conveying the glass tube 1. A flame assembly 3 is arranged on one side of the conveying line 2.4, comprising several melting flames 3.2 spaced apart along the conveying direction of the conveying line 2.4. The air inlet of each melting flame 3.2 is connected to a gas source 4 via a pipe. The gas source 4 includes natural gas and / or oxygen. The melting flames 3.2 are used to seal the glass tube. The end of the tube to be sealed is heated and melted. A graphite mold valve mechanism 5 is set near the melting flame 3.2. The graphite mold valve mechanism 5 includes several graphite mold valves 5.1. The graphite mold valves 5.1 can move back and forth to approach or move away from the glass tube 1. On the other side of the conveyor line 2.4, opposite to the graphite mold valves 5.1, several rotating tube grippers 2.2 are set. Under the action of the valves, the rotating tube grippers 2.2 and the graphite mold valves 5.1 can rotate synchronously and cooperate to clamp both ends of the glass tube 1 so that the end of the glass tube 1 to be sealed is synchronously heated and sealed above the melting flame 3.2.

[0024] like Figure 6As shown, the inner and outer tubes of the unsealed glass tube 1 are normally open. After sealing, the inner and outer tube openings of the sealed end of the glass tube 1 are fused together and are in a closed state. During operation, open the valve connected to the gas source 4, ignite the melting flame 3.2 with an igniter, power on the control cabinet of the control center 6, first reset to ensure that all mechanisms on the equipment are in their original positions, and press start to run after the reset is complete. After the equipment is running normally, the rotating gripper 2.2 and the graphite mold impact valve 5.1 rotate synchronously. The gripper 2.2 clamps and drives the glass tube to start rotating, which is used to position the longitudinal position of the glass tube. The conveying mechanism 8 conveys the unsealed glass tube 1 to the feed end of the conveyor line 2.4. The rotating gripper 2.2 and the graphite mold impact valve 5.1 cooperate to clamp the two ends of the glass tube 1, so that the tube opening of the end to be sealed of the glass tube 1 rotates and heats synchronously above the melting flame 3.2. The graphite mold 2.13 is mainly used for the fusion of the inner and outer tube openings of the glass tube to achieve sealing.

[0025] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferred, such as... Figure 3 As shown, the graphite mold impact valve mechanism 5 also includes a base and a movable base. The movable base is connected to the piston rod end of the horizontally arranged impact valve cylinder 5.3. A guide rail is arranged on the base perpendicular to the conveyor line 2.4. The movable base is slidably connected to the guide rail through a slider 5.2. Several graphite mold impact valves 5.1 extending towards the melting flame 3.2 are arranged on the movable base. Each graphite mold impact valve 5.1 is rotatably connected to the movable base through a mold shaft rotation transmission shaft 5.5. The mold shaft rotation transmission shaft 5.5 is connected to a rotation motor 5.4. Under the action of the impact valve cylinder 5.3, the movable base can drive the graphite mold impact valve 5.1 to move back and forth along the guide rail to approach or move away from the glass tube 1. Under the action of the rotation motor 5.4 and the mold shaft rotation transmission shaft 5.5, the graphite mold impact valve 5.1 can rotate relative to the movable base. During operation, the impact valve cylinder 5.3 is activated, pushing the graphite mold impact valve 5.1 forward in a rotating state to seal the glass tube.

[0026] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferred. The rotating gripper 2.2 includes a rotating seat facing the conveyor line 2.4. The rotating seat is rotatably connected to a mounting seat located on one side of the conveyor line 2.4. The rotating seat is driven by another rotating motor synchronized with the self-rotating motor 5.4. Several grippers for holding the glass tube 1 are spaced apart on the side of the rotating seat facing the conveyor line 2.4. It should be noted that the mounting seat is preferably slidably connected to the frame. Driven by a cylinder, the mounting seat can move the grippers back and forth, approaching or moving away from the glass tube, via the rotating seat. The middle part of the rotating base is equipped with several air nozzles for blowing air between the inner and outer tubes of the glass tube 1. The air nozzles are controlled to start and stop by the air blowing valve 2.1, which is a solenoid valve. Before and during the sealing of the inner and outer tube openings of the glass tube by the graphite mold impact valve 5.1, the air blowing solenoid valve is activated to blow compressed air into the glass tube through the air nozzles to ensure that no water vapor is generated in the interlayer between the inner and outer tubes of the glass tube and that the sealing opening of the glass tube is round and full. The timing, duration, and interval of air blowing by the air blowing valve 2.1 during the process are set in the control cabinet of the control center 6 according to the process requirements.

[0027] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferably provided with a self-rotating lifting plate 2.3 on both sides of the conveyor line 2.4. The self-rotating lifting plate 2.3 includes a lifting seat that can be raised and lowered and several rollers that are spaced apart along the axial direction of the conveyor line 2.4 on the lifting seat. The rollers are rotatably connected to the lifting seat. The rotation of the rollers rotates the glass tube to ensure the uniform heating of the glass tube and is used for the lateral positioning of the glass tube. Under the action of the control center 6, the lifting seat can drive the rollers to rise relative to the conveyor line 2.4 to lift the glass tube 1 or to fall relative to the conveyor line 2.4 to drop the glass tube 1 onto the conveyor line 2.4.

[0028] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferably provided. Several preheating heads 3.1 are spaced apart in the feeding direction of the melting head 3.2, and several annealing heads 3.3 are spaced apart in the discharging direction of the melting head 3.2. The preheating heads 3.1, melting heads 3.2, and annealing heads 3.3 are arranged sequentially along the feeding direction of the conveyor line 2.4. The number of preheating heads 3.1, melting heads 3.2, annealing heads 3.3, and rotating tube grippers 2.2 is the same. The preheating heads 3.1 preheat the glass tube opening to 400-480 degrees Celsius to prepare for the next process of melting and heating the glass tube. If the glass tube is not preheated and directly melted and heated by the main head, the high heat output of the main head and the glass tube... The large temperature difference inherent in glass tubes can easily lead to breakage. Preheating the glass tube beforehand accelerates the melting speed at the tube opening when the main flame melts. Melting flame 3.2 heats and melts the tube opening to approximately 1200 degrees Celsius, bringing the inner and outer tube openings to a liquid, whitish state, preparing for sealing. Annealing flame 3.3, with a flame temperature of 400-500 degrees Celsius, is used to anneal and eliminate the stress generated by the sealing process. Additionally, since the tube opening is still hot after sealing, the annealing flame gradually cools it down. The annealing temperature and time are determined according to process requirements, aiming to meet the stress requirements at the tube opening.

[0029] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferred. A transplanting mechanism 7 is provided between the conveying mechanism 8 and the conveying line 2.4. The conveying mechanism 8 includes a conveying chain 8.1 for conveying the glass tube and a conveying motor 8.2 for increasing the power of the conveying chain 8.1. The conveying chain 8.1 has top rollers with a pitch designed according to the diameter of the outer glass tube, used to stably support the glass tube on the conveying chain. The transplanting mechanism 7 includes a transplanting guide rail extending axially along the conveying line 2.4. A transplanting seat is slidably connected to the transplanting guide rail via a transplanting slider 7.1. Under the action of the transplanting cylinder 7.3, the transplanting seat can move left and right along the transplanting guide rail to approach or move away from the conveying chain 8.1. The height of the transplanting seat is lower than the height of the conveying chain 8.1 and the conveying line 2.4. At both ends of the transplanting seat, support blocks 7.4 are connected via vertically arranged lifting cylinders 7.2. Under the action of the transplanting seat and the lifting cylinder 7.2, the support block 7.4 can approach the conveying mechanism 8 and rise to lift the glass tube 1 conveyed by the conveying mechanism 8, or approach the conveying line 2.4 and descend relative to the conveying line 2.4 to drop the glass tube 1 onto the conveying line 2.4. During operation, the transplanting seat drives the support block 7.4 to stop at one end adjacent to the conveying chain 8.1. When the glass tube 1 conveyed by the conveying mechanism 8 is conveyed above the support block 7.4, the lifting cylinder 7.2 is activated, lifting the glass tube through the support block 7.4. The transplanting cylinder 7.3 is activated, and the support block 7.4 is slid to one end adjacent to the conveying line 2.4 through the transplanting seat. The lifting cylinder 7.2 is closed, the support block 7.4 descends, and the glass tube is placed onto the conveying line 2.4, completing the smooth transplanting of the glass tube. In actual operation, according to the work needs, by changing the structure of the support block 7.4, it is possible to transplant one or more glass tubes at a time.

[0030] As an optional design, the automatic sealing device for the inner and outer tubes of the glass tube is preferred. A baffle 2.5 is set in the material feeding direction of the preheating head 3.1 and is parallel to the conveyor line 2.4. The rollers of the self-rotating lifting plate 2.3 rotate and drive the glass tube 1 to rotate. Through the rotation of the glass tube, the glass tube moves closer to the baffle 2.5 to achieve lateral positioning.

[0031] In actual production, the number of glass tubes processed per cycle is determined according to the situation. Taking the processing of four glass tubes per cycle as an example, the working process of the automatic sealing device for inner and outer tubes of this utility model is described in detail:

[0032] Before starting the machine, turn on the gas source 4 to supply gas, and ignite the preheating burner 3.1, melting burner 3.2, and annealing burner 3.3 with an igniter. Adjust the gas supply valve to ensure that all burners are in normal combustion state. Power on the control cabinet of the control center 6 and first reset to ensure that all mechanisms on the equipment are in their original positions. After the reset is completed, press the start button. After the equipment is running normally, the self-rotating motor 5.4 starts, and the rotating gripper 2.2 and the graphite mold impact valve 5.1 rotate synchronously.

[0033] Each time a glass tube arrives on the conveyor chain 8.1, the conveyor motor 8.2 drives the conveyor chain 8.1 to move forward one station, repeating this process. When the conveyor mechanism 8 transports the unsealed glass tube 1 to above the support block 7.4, the lifting cylinder 7.2 activates, lifting the glass tube via the support block 7.4. The transfer cylinder 7.3 starts, and the transfer seat drives the support block 7.4 to slide along the transfer guide rail to one end near the conveyor line 2.4. The lifting cylinder 7.2 closes, the support block 7.4 descends, and the glass tube lifted by the support block 7.4 falls onto the conveyor line 2.4. The control center 6 controls the conveyor line 2.4 to move forward one station. This process repeats itself. When four glass tubes are placed on station 2.4 of the conveyor line, these four glass tubes form the first group. The conveyor line 2.4 moves forward four stations. When the first group of glass tubes reaches the top of the rotating lifting plate 2.3, i.e., the baffle alignment station, the lifting seat of the rotating lifting plate 2.3 drives the rollers to rise and lift the four glass tubes, and drives the glass tubes to rotate. Through the rotation of the glass tubes, the glass tubes move towards the baffle 2.5 for alignment and positioning. At this time, the second group of four tubes has also been placed on the conveyor line 2.4. The lifting seat of the rotating lifting plate 2.3 descends, placing the four glass tubes of the first group onto the conveyor line 2.4. The conveyor line 2.4 then moves forward four stations.

[0034] The first group of four tubes travels to the preheating head 3.1 position, the second group of four tubes goes to the baffle alignment position, the self-rotating lifting plate 2.3 rises, lifting the first and second groups of glass tubes, the first group of glass tubes is preheated on the preheating head 3.1, the second group of glass tubes begins to be aligned, and the third group of four tubes has also been placed on the conveyor line 2.4.

[0035] After one preheating cycle of sealing the glass tubes is completed, the rotating lifting plate 2.3 descends, and the conveyor line 2.1 transports the first, second, and third groups of glass tubes forward to four stations respectively. At this time, the four glass tubes of the first group are at the melting flame head 3.2, the four glass tubes of the second group are at the preheating flame head 3.1, and the third group is at the baffle alignment station. The rotating tube gripper 2.2 moves forward, clamps the glass tubes, and rotates them. The melting flame head 3.2 heats and melts the opening of the first group of glass tubes. According to the process requirements, the air blowing valve 2.1 is activated, blowing air through the air nozzle into the space between the inner and outer tubes of the glass tubes. The blowing time and number of times are set according to the process requirements. After the melting time is reached, the impact valve cylinder 5.3 moves, pushing the graphite mold impact valve 5.1 forward to seal the glass tubes. After the impact valve cylinder 5.3 moves forward to the desired position, it stays for a certain time and then retracts. The number of times the impact valve cylinder 5.3 moves towards the glass tubes is set according to the process requirements. After sealing, the rotating lifting plate 2.3 descends, placing the second and third sets of glass tubes onto conveyor line 2.1. Conveyor line 2.1 moves forward four stations. At this time, the first set of four glass tubes moves to the annealing head 3.3, the second set moves to the heating and melting sealing position, the third set moves to the preheating station, and the fourth set moves to the tidying station. Each set of glass tubes performs its own operation. The first set of four glass tubes undergoes annealing on the annealing head 3.3 to eliminate stress at the tube opening. After one cycle, the first set of glass tubes is conveyed by conveyor line 2.1 to the tube lowering station. The second, third, and fourth sets of glass tubes move forward one station in sequence. When the next cycle begins, the first set of glass tubes flows to the next process line. The other sets of glass tubes follow the same pattern, and the production process is repeated. This ensures the precise positioning of the glass tubes, the annealing head, and the graphite mold valve, improves sealing quality, achieves streamlined production, and increases production efficiency.

[0036] The above description is only an application implementation of this utility model, but the protection scope of this utility model is not limited thereto and cannot be used to limit the scope of rights of this utility model. Any equivalent changes made according to the technical solution of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic sealing device for inner and outer tubes of a glass tube, comprising a conveying mechanism for conveying the glass tube, characterized in that: It also includes a sealing mechanism, a flame assembly, and a graphite mold valve mechanism. The sealing mechanism includes a conveyor line for receiving and conveying the glass tube. A flame assembly is provided on one side of the conveyor line. The flame assembly includes several melting flames spaced apart along the conveying direction of the conveyor line. The melting flames are used to heat the end of the glass tube to be sealed. A graphite mold valve mechanism is provided near the melting flames. The graphite mold valve mechanism includes several graphite mold valves that can move back and forth to approach or move away from the glass tube. On the other side of the conveyor line, opposite to the graphite mold valves, several rotating grippers are provided. Under the control of the control center, the rotating grippers and the graphite mold valves can rotate synchronously and cooperate to clamp both ends of the glass tube so that the end of the glass tube to be sealed is synchronously heated and sealed above the melting flames.

2. The automatic sealing device for the inner and outer tubes of a glass tube according to claim 1, characterized in that: The graphite mold impact valve mechanism also includes a base and a movable seat. A guide rail is set on the base, which is perpendicular to the conveyor line. The movable seat is slidably connected to the guide rail via a slider. Several graphite mold impact valves extending towards the melting flame are set on the movable seat. Each graphite mold impact valve is rotatably connected to the movable seat via a mold shaft rotation drive shaft. Under the action of the impact valve cylinder, the movable seat can drive the graphite mold impact valves to move back and forth, approaching or moving away from the glass tube. Under the action of the rotation motor and the mold shaft rotation drive shaft, the graphite mold impact valves can rotate relative to the movable seat.

3. The automatic sealing device for the inner and outer tubes of a glass tube according to claim 2, characterized in that: The rotary tube gripper includes a rotary seat facing the conveyor line, which is rotatably connected to a mounting seat on one side of the conveyor line. Several grippers for holding glass tubes are spaced apart on the side of the rotary seat facing the conveyor line. Several air nozzles for blowing air into the space between the inner and outer tubes of the glass tube are provided in the middle of the rotary seat. The air nozzles are controlled to start and stop by an air blowing valve.

4. The automatic sealing device for the inner and outer tubes of a glass tube according to claim 3, characterized in that: Self-rotating lifting plates are set on both sides of the conveyor line. Each self-rotating lifting plate includes a lifting seat that can be raised and lowered and several rollers that are spaced apart along the axial direction of the conveyor line on the lifting seat. The rollers are rotatably connected to the lifting seat. Under the action of the control center, the lifting seat can drive the rollers to rise relative to the conveyor line to lift the glass tube or fall relative to the conveyor line to drop the glass tube onto the conveyor line.

5. The automatic sealing device for the inner and outer tubes of a glass tube according to claim 3, characterized in that: Several preheating heads are spaced apart in the material feeding direction of the melting head, and several annealing heads are spaced apart in the material discharging direction of the melting head. The preheating heads, melting heads, and annealing heads are arranged sequentially along the feeding direction of the conveyor line, and the number of preheating heads, melting heads, annealing heads, and rotating grippers is the same.

6. The automatic sealing device for inner and outer tubes of a glass tube according to claim 3, characterized in that: in A transplanting mechanism is provided between the conveying mechanism and the conveying line. The transplanting mechanism includes a transplanting guide rail extending along the axial direction of the conveying line. A transplanting seat is slidably connected to the transplanting guide rail via a transplanting slider. The height of the transplanting seat is lower than the height of the conveying mechanism and the conveying line. At both ends of the transplanting seat, a support block is connected to a vertically installed lifting cylinder. Under the action of the transplanting seat and the lifting cylinder, the support block can approach the conveying mechanism and rise to lift the glass tube conveyed by the conveying mechanism, or approach the conveying line and descend relative to the conveying line to drop the glass tube onto the conveying line.

7. The automatic sealing device for the inner and outer tubes of a glass tube according to claim 5, characterized in that: A baffle is installed in the material feeding direction of the preheating head, which is parallel to the conveyor line.

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