Automatic production process of graphene heating tube

Abstract

The invention relates to the field of graphene heating tubes, in particular to an automatic production process of a graphene heating tube, which comprises the following steps of: preparing a heating wire from a graphene sheet, namely preparing the heating wire with a required shape from the graphene sheet through a pressing and cutting device; a molybdenum sheet and a molybdenum rod are welded to the two ends of the heating wire to serve as electrodes; penetrating the heating wire with the electrode into the quartz tube through a tube penetrating device; pressing and sealing the two ends of the quartz tube, and filling inert gas to provide protection in the pressing and sealing process; and arranging the lamp caps at the two ends of the quartz tube after being pressed and sealed. After the scheme is adopted, full-automatic production of the graphene heating tube is realized, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of graphene heating tubes, in particular to an automatic production process of graphene heating tubes. Background Art

[0002] Graphene is a two-dimensional material composed of a single layer of carbon atoms, with extremely high thermal conductivity and excellent electrical conductivity. When electricity is applied, the free electrons in graphene move irregularly under the action of the current, a phenomenon called Brownian motion. In this process, the collision between electrons and the interaction between electrons and carbon atoms generate heat, which is generated by the collision and friction between carbon atoms in the resistance layer.

[0003] The electric-to-heat conversion efficiency of graphene heating tubes is higher than that of the commonly used carbon fiber heating tubes. Therefore, more and more companies have started to research the relevant technologies of graphene heating tubes, such as a graphene film heating tube and a preparation method thereof disclosed in CN117915502A, a graphene heating film and a heating device including the graphene heating film disclosed in CN208001380U, both of which involve heating wires with continuous bow-shaped distribution.

[0004] Due to the fragility of the graphene heating wire itself, in the existing production process, after the graphene heating wire is prepared (with electrodes installed), the heating wire is manually inserted into the glass tube / quartz tube, which has low production efficiency.

[0005] For example, although CN117915502A discloses a method for preparing a heating tube, it only describes the manufacturing process of the heating tube itself and does not involve automatic production.

[0006] Therefore, the inventor conducted further research and developed an automatic production process for graphene heating tubes, which resulted in the present case. Summary of the invention

[0007] The purpose of the present invention is to provide an automatic production process for graphene heating tubes, thereby realizing full-automatic production of graphene heating tubes and improving production efficiency.

[0008] In order to achieve the above object, the technical solution of the present invention is as follows:

[0009] An automatic production process for a graphene heating tube comprises the following steps:

[0010] A step for making the graphene sheet into a heating wire, in which the graphene sheet is made into a heating wire of a desired shape by a pressing and cutting device;

[0011] A step for welding the molybdenum sheet and the molybdenum rod to both ends of the heating wire as electrodes;

[0012] A step for inserting a heating wire with an electrode into a quartz tube through a tube inserting device;

[0013] A step for sealing the two ends of the quartz tube by pressure, and inert gas is filled to provide protection during the sealing process;

[0014] A step for setting the lamp holders at both ends of the quartz tube after compression sealing;

[0015] The pressing and cutting device is provided with a mold, on which a blade matching the heating wire is provided, and cooperates with a pressing plate with a lifting function to realize the cutting and pressing of the heating wire;

[0016] The tube-threading device is provided with a guide tube. Through the relative movement between the guide tube and the quartz tube, the guide tube enters the quartz tube, and one end of the guide tube clamps the heating wire, and then the heating wire is pulled into the quartz tube.

[0017] The difficulty in realizing the fully automated production of graphene heating wires lies in the initial yield rate of the cut and pressed heating wires and whether the automatic tube threading process can be realized. The traditional production method of the former is to use mutually interlocking molds to cut the heating wires, which easily leads to the breakage of graphene sheets, while the latter is to use manual tube threading. Therefore, there is no fully automatic production process for graphene heating tubes on the market so far.

[0018] Furthermore, in the step of making the graphene sheet into the heating wire, the large graphene sheet is first cut into strip-shaped graphene sheets, and then processed by a pressing and cutting device; the strip-shaped graphene sheet is placed on the blade of the pressing and cutting device, and a replaceable buffer plate is also provided between the blade and the pressing plate.

[0019] Since the blade is rigid, in order to avoid damage to the blade when the pressure plate and the blade act, the hardness of the blade needs to be greater than that of the pressure plate. Therefore, a replaceable buffer plate is set on the bottom plate of the pressure plate to make its hardness lower than the blade, which makes cutting more convenient and can also protect the blade.

[0020] Furthermore, the buffer plate can be displaced relative to the pressure plate or the blade.

[0021] After one position of the buffer plate contacts the blade too much, it cannot be used any more. Therefore, by moving the buffer plate to change the contact position with the blade, the utilization rate of the buffer plate can be improved and frequent replacement can be avoided.

[0022] Furthermore, in the step of inserting the heating wire into the quartz tube, one end of the guide tube is arranged on the fixed bracket, and the other end is arranged on the movable bracket, and a clamping portion is arranged at the end of the guide tube;

[0023] The quartz tube is clamped on the placement rack, and the quartz tube can be sleeved outside the guide tube by moving the placement rack;

[0024] When the placement rack clamps the quartz tube and moves toward the guide tube, the movable bracket moves in the same direction following the placement rack.

[0025] Since the quartz tube is long and has a small aperture, it is difficult to directly place the heating wire into the quartz tube without external force. Therefore, a guide tube (the clamping part can be used to clamp the heating wire) is provided to pull the heating wire, and the length of the guide tube needs to be longer than the quartz tube. Therefore, the quartz tube is moved while the guide tube is kept stationary. Due to the entry of the quartz tube, the movable bracket, which was originally one of the supporting points of the guide tube, needs to give way.

[0026] Furthermore, a fixing clamp is provided on the placement rack, and the fixing clamp includes two clamping positions for positioning the quartz tube.

[0027] Since the quartz tube is relatively long, using a fixing clamp with at least two clamping positions can better maintain the stability of the quartz tube.

[0028] Furthermore, the placement rack is driven by a driving source to achieve movement, and the guide tube and the placement rack are driven by another driving source to achieve movement.

[0029] First, the quartz tube is sleeved outside the guide tube by driving a driving source, and then the sleeved guide tube and the quartz tube are moved together to the heating wire for guiding by driving another driving source.

[0030] Furthermore, in the step of sealing the two ends of the quartz tube, the quartz tube is heated and broken, and the exhaust pipe is welded; and after the final inflation is completed, the exhaust pipe is burned off.

[0031] Since the heating wire in the graphene heating tube ultimately needs to work under the condition of protective gas, the comparative document "CN117915502A" is achieved by "evacuating the reserved hole in the middle of the quartz outer tube during the heating and shaping process and then filling it with protective gas, and hot-melt-sealing the reserved hole after shaping"; while in the present invention, the "reserved hole" is replaced by an "exhaust pipe", and inflation can be carried out from one end of the quartz tube, and exhaust is carried out through the exhaust pipe, which can not only ensure the sealing, but also facilitate the subsequent "sealing".

[0032] Furthermore, after the steps of pressure-sealing the two ends of the quartz tube, the quartz tube is dried, powered on, and then filled with protective gas.

[0033] Drying and powering on can remove possible impurities in the quartz tube.

[0034] Furthermore, the lamp holder is a ceramic holder, and the sealed quartz tube is firstly glued and heated, and then the ceramic holder is arranged at both ends of the quartz tube.

[0035] Furthermore, the quartz tube is marked after the ceramic head is solidified.

[0036] Marked as content related to product information.

[0037] After adopting the above scheme, the present invention has the following advantages compared with the prior art:

[0038] The present invention solves various difficulties in the full-automatic production of graphene heating tubes and realizes the full-automatic production of graphene heating tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the layout of the entire automatic production system;

[0040] Figure 2 It is a schematic diagram of the layout of the punching and forming device and the feeding device;

[0041] Figure 2-1 is a schematic diagram of a punching and forming device;

[0042] Figure 2-2 yes Figure 2-1 A partial enlarged view of the middle A;

[0043] Figure 2-3 is a schematic diagram of the mold;

[0044] Figure 2-4 This is a schematic diagram of the processed heating wire (without electrodes);

[0045] Figure 3 is a schematic diagram of an electrode spot welding device;

[0046] Figure 3-1 It is a schematic diagram of an 8-station rotating turntable;

[0047] Figure 3-2 This is a schematic diagram of the heating wire after welding the electrode;

[0048] Figure 4 It is a schematic diagram of the pipe threading device;

[0049] Figure 4-1 It is a schematic diagram of the coordination of the guide tube and the quartz tube;

[0050] Figure 4-2 This is a schematic diagram after the pipe threading is completed;

[0051] Figure 5 It is a schematic diagram of a one-end compression seal device;

[0052] Figure 5-1 It is a schematic diagram of the clamping mechanism and the pressure-sealing fire head mechanism;

[0053] Figure 6 It is a schematic diagram of a two-end pressure sealing device;

[0054] Figure 7 It is a schematic diagram of a drying and fusing device;

[0055] Figure 8 is a schematic diagram of the ceramic head mounting device;

[0056] Fig. 9 is a schematic diagram of a material conveying device;

[0057] Figure 9-1 It is a schematic diagram of the coordination between the positioning unit and the carrying unit.

[0058] Description of symbols

[0059] Punching and forming device 1,

[0060] Mold 11, pressing plate 12, buffer plate 13, adsorption hole 14;

[0061] Electrode spot welding device 2,

[0062] 8-station rotating turntable 21, pneumatic clamping jaws 22, molybdenum wire 23, molybdenum sheet 24;

[0063] Pipe threading device 3,

[0064] Guide tube 31, movable bracket 32, fixed bracket 33,

[0065] A first electric cylinder 34, a second electric cylinder 35, and a placement rack 36;

[0066] One end pressure sealing device 4,

[0067] One end of the rotary plate 41 is pressed and sealed, the clamping mechanism 42 has an upper clamping position 421 and a lower clamping position 422.

[0068] The fire head pressure sealing mechanism 43, the fire breaking mechanism 44, the exhaust pipe connecting mechanism 45,

[0069] One end air blowing mechanism 46;

[0070] Two-end pressure sealing device 5, two-end pressure sealing turntable 51;

[0071] Drying and fusing device 6, 16-station turntable 61;

[0072] Ceramic head mounting device 7, heating box 71;

[0073] Marking device 8;

[0074] Material conveying device 9;

[0075] Carrier 91, fixed slide rail 92, lifting slide rail 93, lifting plate 94, arc-shaped component 95,

[0076] Horizontal drive cylinder 96, lifting drive cylinder 97;

[0077] Heating wire 101 and quartz tube 102 . DETAILED DESCRIPTION

[0078] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0079] An automatic production process for a graphene heating tube comprises the following steps:

[0080] A step for making the graphene sheet into a heating wire, in which the graphene sheet is made into a heating wire of a desired shape by a pressing and cutting device;

[0081] A step for welding the molybdenum sheet and the molybdenum rod to both ends of the heating wire as electrodes;

[0082] A step for inserting a heating wire with an electrode into a quartz tube through a tube inserting device;

[0083] A step for sealing the two ends of the quartz tube by pressure, and inert gas is filled to provide protection during the sealing process;

[0084] The invention relates to a step for setting the lamp holders at both ends of the quartz tube after compression sealing.

[0085] The above process is based on the automatic production system of graphene heating tubes, and the technical solutions and features involved in its main steps are as follows:

[0086] like Figure 1 The angle shown is a top view of the whole system. Taking the direction in the figure as a reference, from bottom to top, it includes a punching and forming device 1, an electrode spot welding device 2, a tube threading device 3, a one-end pressure sealing device 4, a two-end pressure sealing device 5, a drying and fusing device 6, a ceramic head installation device, and a marking device; between the above devices, when the quartz tube can be transferred horizontally, it can be transported by a material conveying device. In particular, in front of the one-end pressure sealing device 4 and beside the tube threading device 3, an additional material conveying device is provided, on which the manually threaded quartz tube can be placed.

[0087] like Figure 2 As shown in the figure, the right side is a loading device, and the left side is a punching and forming device 1. The loading device transports the complete graphene sheets stacked on the far right to the left, and cuts them into strip-shaped graphene sheets by a cutter in the middle, so as to facilitate the punching and forming device 1 on the left to process; the loading device here can transport the graphene sheets through a vacuum suction cup.

[0088] Figure 2-1 The schematic diagram of the punching and forming device 1 is a schematic diagram of the punching and forming device 1, the bottom of which is mainly provided with a mold 11 (refer to Figure 2-3), the shape of the mold 11 is consistent with the graphene heating wire, and there are blades distributed on it. When the upper pressing plate 12 is pressed down with the buffer plate 13, the graphene sheet placed on the mold 11 is cut into graphene heating wires.

[0089] like Figure 2-2 As shown, negative pressure devices are provided on both sides of the mold 11, which adsorb the graphene sheet debris through the adsorption holes 14 and take it away by moving. After leaving the mold 11, the suction is canceled, so that the debris falls into the conveyor belt below and is transported away.

[0090] Since the buffer plate 13 and the blade need to be changed after cutting multiple times at the same position, brackets are set on both sides thereof, and the brackets are linked with a servo motor so that the servo motor can drive the buffer plate 13 to translate relative to the pressure plate 12, thereby improving the utilization efficiency of the buffer plate 13.

[0091] like Figure 3 As shown, after cutting, the heating wire will be transported to the electrode spot welding device 2, and its main layout is to provide electrodes on both sides of the transmission path of the heating wire to weld it to the heating wire. The electrode itself is composed of two molybdenum wires 23 and a molybdenum sheet 24, so the electrode must be made before welding; the welding of the electrode is completed on the 8-station rotating turntable 21, refer to Figure 3-1 As shown:

[0092] A pneumatic clamp 22 is set at each workstation, and the pneumatic clamp 22 is mainly used to clamp the molybdenum wire 23. First, a molybdenum wire 23 is clamped in the left workstation, and then it is rotated to the lower workstation to weld the molybdenum sheet 24 to the outside of the molybdenum wire 23, and finally it is rotated to the right workstation to weld another molybdenum wire 23 to the molybdenum sheet 24 to complete the production of the electrode; the completed molybdenum wire 23 is transported to the two ends of the heating wire for welding by rotating the clamp at the upper workstation.

[0093] like Figure 4 As shown, the heating wire after welding is transported to the tube-threading device 3, and the heating wire with electrodes installed is inserted into the quartz tube, which is provided by another feeding device.

[0094] like Figure 4-1 As shown, the tube-threading device 3 includes a guide tube 31. By driving one end of the guide tube 31 through the quartz tube and clamping the heating wire with the electrode welded by the flexible clamp at its end, the heating wire can be pulled into the quartz tube.

[0095] One end of the guide tube 31 is arranged on the fixed bracket 33, and the other end is arranged on the movable bracket. A flexible clamp is arranged at the end of the guide tube 31; the tube threading device 3 also includes a placement rack 36, which is used to clamp the quartz tube. The quartz tube can be sleeved outside the guide tube 31 by moving the placement rack 36; when the placement rack 36 clamps the quartz tube and moves toward the guide tube 31, the movable bracket follows the placement rack 36 to move in the same direction.

[0096] The guide tube 31 is at the initial position on the left side. The quartz tube is first transported to the placement rack 36 for fixation, and then the placement rack 36 is driven to move to the left by the first electric cylinder 34. The quartz tube is completely inserted into the outside of the guide tube 31 from right to left.

[0097] At this time, the second electric cylinder 35 is started, and the first electric cylinder 34, movable bracket 32, fixed bracket 33, guide tube 31, quartz tube and other components arranged thereon are moved to the right together, that is, the guide tube 31 and quartz tube that have been inserted are mainly moved to the position where the heating wire is located, and the left end of the heating wire is clamped by the flexible clamp at the end of the guide tube 31, and the right end of the heating wire is clamped by the pneumatic finger on the right, and then the guide tube 31 is withdrawn from the quartz tube, and the heating wire is pulled into the quartz tube. At this time, the pneumatic finger on the left clamps the right end of the heating wire, and the flexible clamp of the guide tube 31 is released to complete the traction.

[0098] like Figure 5 As shown, after the tube is threaded, both ends of the quartz tube need to be hot-sealed and filled with protective gas. Therefore, the quartz tube after the tube is threaded is first transported to a sealing device 4 at one end, which includes a sealing turntable 41 at one end, and a plurality of clamping mechanisms 42 are arranged on the sealing turntable 41 at one end for clamping the electrodes of the quartz tube and the heating wire; a sealing fire head mechanism 43, a rupture fire mechanism 44, and an exhaust pipe connecting mechanism 45 are also arranged around the sealing turntable 41 at one end.

[0099] like Figure 5-1 As shown, the clamping mechanism 42 includes an upper clamping position 421 and a lower clamping position 422, the upper clamping position 421 clamps the electrode and the quartz tube at the same end at the same time, and the lower clamping position 422 clamps the middle of the quartz tube; it also includes a blowing mechanism 46 at one end, and the blowing mechanism 46 at one end is connected to the sealed end of the quartz tube.

[0100] The quartz tube is clamped in a vertical state by a clamping mechanism 42, and the lower end of the quartz tube is heated and sealed by a pressure-sealing fire head mechanism 43; it is rotated to a rupture fire mechanism 44, and the side wall of the quartz tube is melted by the rupture fire mechanism 44; then the quartz tube is transferred to an air pipe connecting mechanism 45, and an air pipe is welded to the quartz tube.

[0101] The aforementioned rupture fire mechanism 44 and exhaust pipe connecting mechanism 45 involved in connecting the quartz tube to the exhaust pipe can refer to the technical solution disclosed by the applicant in "A fully automatic production equipment for glass lamp tubes CN116417308A", and the "inflating tube" is connected to a glass tube through various fire heads.

[0102] During the above process, the blowing mechanism 46 at one end continuously blows inert gas into the quartz tube to prevent the heating wire inside from being affected by oxidation.

[0103] like Figure 6 As shown, the two-end pressure-sealing device 5 also includes a two-end pressure-sealing turntable 51. Since one end has been pressure-sealed, the clamping of the quartz tube can omit the clamping of the pressure-sealed end, and since it no longer requires steps such as docking with the exhaust pipe, the two-end pressure-sealing turntable 51 only needs to be set up with 4 workstations, while the one-end pressure-sealing device 4 has 12 workstations.

[0104] like Figure 7 As shown, after the two ends of the quartz tube are sealed, an exhaust pipe is connected to its side wall, so it is transported to the drying and fusing device 6 for further processing. The drying and fusing device 6 mainly includes a 16-station turntable 61. After the quartz tube is heated and powered on at multiple stations, it is filled with protective gas and the gas pipe is melted before the final unloading.

[0105] like Figure 8 As shown, after the inflation is completed, the quartz tube is transported to the ceramic head installation device, and the ceramic heads are installed on the ends after the two ends are sealed. First, glue is applied to the quartz tube on the material conveying device, and then the ceramic heads are inserted into the sealed ends, heated by the heating box, and finally the processed heating tube is marked in the marking device.

[0106] In the transportation between the above-mentioned devices, whenever the quartz tube is in a horizontal and continuous transportation state, the material conveying device can be used for transportation.

[0107] like Fig. 9 , 9-1As shown, the material conveying device includes a plurality of narrow and long carriers 91, and clamps matching the quartz tube are arranged at both ends of the carriers 91. The carriers 91 can reciprocate on the slide rails of the upper and lower layers. The slide rails include fixed slide rails 92 and lifting slide rails 93, and the lifting slide rails 93 are arranged at both ends of the fixed slide rails 92. Taking the upper layer as an example, a horizontal driving cylinder 96 is arranged on the left side, and the push rod of the horizontal driving cylinder 96 moves from left to right when extended, so as to move the carriers 91 of the whole layer. Since the lifting slide rails 93 are at both ends of the fixed slide rail 92, when the carrier 91 on the left side is pushed away, a position for a carrier 91 is vacated, and the lifting driving cylinder 97 can transport the carrier 91 of the lower layer to the upper layer, and the carrier 91 on the rightmost end on the lifting slide rail 93 is transported to the lower layer, and the movement direction of the carrier 91 of the lower layer is opposite to that of the upper layer.

[0108] A lifting plate 94 is arranged below the corresponding carrier 91, and a plurality of protruding arc-shaped parts 95 are arranged on the lifting plate 94. When the lifting plate 94 is lifted and lowered by the cylinder drive, the arc-shaped parts 95 can enter / leave the groove at the bottom of the carrier 91, thereby realizing the precise positioning of the carrier 91, ensuring the accuracy of the automated transmission, and facilitating the respective clamps to grab or place the quartz tube.

[0109] The above are only specific embodiments of the present invention. At the same time, all words such as "upper, lower, left, right, middle" involved in the present invention are for reference only and are not absolute limitations. Any non-substantial changes made using the present invention shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An automatic production process for graphene heating tubes, characterized in that: The steps include: A step for making the graphene sheet into a heating wire, in which the graphene sheet is made into a heating wire of a desired shape by a pressing and cutting device; A step for welding the molybdenum sheet and the molybdenum rod to both ends of the heating wire as electrodes; A step for inserting a heating wire with an electrode into a quartz tube through a tube inserting device; A step for sealing the two ends of the quartz tube by pressure, and inert gas is filled to provide protection during the sealing process; A step for setting the lamp holders at both ends of the quartz tube after compression sealing; The pressing and cutting device is provided with a mold, on which a blade matching the heating wire is provided, and cooperates with a pressing plate with a lifting function to realize the cutting and pressing of the heating wire; The tube-threading device is provided with a guide tube. Through the relative movement between the guide tube and the quartz tube, the guide tube enters the quartz tube, and one end of the guide tube clamps the heating wire, and then the heating wire is pulled into the quartz tube.

2. The automatic production process of graphene heating tube according to claim 1, characterized in that: In the step of making the graphene sheet into the heating wire, the large graphene sheet is first cut into strip-shaped graphene sheets, and then processed by a pressing and cutting device; the strip-shaped graphene sheet is placed on the blade of the pressing and cutting device, and a replaceable buffer plate is also arranged between the blade and the pressing plate.

3. The automatic production process of graphene heating tube according to claim 2, characterized in that: The buffer plate can be displaced relative to the pressure plate or the blade.

4. The automatic production process of graphene heating tube according to claim 1, characterized in that: In the step of inserting the heating wire into the quartz tube, one end of the guide tube is arranged on the fixed bracket, and the other end is arranged on the movable bracket, and a clamping part is arranged at the end of the guide tube; The quartz tube is clamped on the placement rack, and the quartz tube can be sleeved outside the guide tube by moving the placement rack; When the placement rack clamps the quartz tube and moves toward the guide tube, the movable bracket moves in the same direction following the placement rack.

5. The automatic production process of graphene heating tube according to claim 1, characterized in that: A fixing clamp is arranged on the placement rack, and the fixing clamp includes two clamping positions for positioning the quartz tube.

6. The automatic production process of graphene heating tube according to claim 4, characterized in that: The placement rack is driven by a driving source to achieve movement, and the guide tube and the placement rack are driven by another driving source to achieve movement.

7. The automatic production process of graphene heating tube according to claim 1, characterized in that: In the step of pressing and sealing the two ends of the quartz tube, the quartz tube is heated and broken, and the exhaust pipe is welded; and after the final inflation is completed, the exhaust pipe is burned off.

8. The automatic production process of graphene heating tube according to claim 1, characterized in that: After the steps of sealing the two ends of the quartz tube, drying the quartz tube, powering on the tube, and then filling it with protective gas.

9. The automatic production process of graphene heating tube according to claim 1, characterized in that: The lamp holder is a ceramic holder. The sealed quartz tube is firstly glued and heated, and then the ceramic holder is arranged at both ends of the quartz tube.

10. The automatic production process of graphene heating tube according to claim 9, characterized in that: After the ceramic head is cured, the quartz tube is marked.

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