Automatic welding and pipe threading device for fine thermocouple wire and use method thereof

Abstract

The invention belongs to the technical field of thermocouples, and discloses an automatic welding and pipe threading device for fine thermocouple wires and a method for using the device, including a loading and unloading mechanism, a pipe threading mechanism, a rotary wire feeding mechanism, a shearing mechanism and a spot welding machine; the loading and unloading mechanism includes a roller, and the roller is evenly distributed with a plurality of placement grooves in the circumference thereof, and a U-shaped quartz tube is placed; the pipe threading mechanism is located upstream of the loading and unloading mechanism, and includes a linear walking unit and a U-shaped platform, the linear walking unit includes a pipe threading electromagnetic tweezers, which clamps the fine thermocouple wire and inserts it into the U-shaped quartz tube, the pipe threading electromagnetic tweezers are provided with a centering module, and the U-shaped platform is provided with a lifting structure, and the centering module uses the lifting structure to align the fine thermocouple wire with the center of the inlet of the U-shaped quartz tube; the rotary wire feeding mechanism is located upstream of the pipe threading mechanism, and includes two wire feeding modules with an angle of no more than 90 degrees. The linear walking unit accurately controls the length of the fine thermocouple wire threading the pipe, and the centering module aligns the fine thermocouple wire with the center of the inlet of the U-shaped quartz tube, and the device does not waste materials.

Description

Technical Field

[0001] The invention relates to the technical field of thermocouples, and in particular to an automatic welding and pipe-threading device for fine thermocouple wires and a use method thereof. Background Art

[0002] Rapid thermocouples can measure temperature in real time and accurately, and are the main temperature measuring devices for molten steel. Thermocouple heads are the key temperature measuring sensors for thermocouples. To manufacture thermocouple heads, the positive and negative thermocouple wires need to be welded together and then inserted into a U-shaped quartz tube. At present, the welding of positive and negative thermocouple wires can be completed by manually operated spot welding machines, but the insertion of the welded thermocouple wires into the U-shaped quartz tube mainly relies on manual operation. As companies reduce the cost of production materials, thermocouple wires tend to be more miniaturized. For example, the diameter of commonly used platinum wires or platinum-rhodium alloy wires is between 1-5 wires, which causes the welded thermocouple wires to be easily bent when inserted into the U-shaped quartz tube, thus requiring higher vision and hand-eye coordination proficiency of the operator. The existing methods for inserting fine thermocouple wires into U-shaped quartz tubes mainly include pulling wire tube insertion and pinch roller tube insertion. The former requires welding other metal wires with a slightly larger diameter at the front end of the thermocouple wire to be inserted into the tube, and the other metal wires are cut off after the tube is inserted, which is complicated and wastes materials. The latter uses pinch rollers to push the thermocouple wire through the tube. The tube-threading process is easily affected by the aging and slipping of the pinch rollers and the contamination of dust, resulting in difficulties in centering the thermocouple wire (the center of the U-shaped quartz tube) and inaccurate control of the length of the thermocouple wire threaded through the tube. Summary of the invention

[0003] The object of the present invention is to provide an automatic welding and pipe threading device for fine thermocouple wires and a method for using the same, wherein the fine thermocouple wires are easy to center, the pipe threading length is accurately controlled, and the process is simple and does not waste materials.

[0004] To achieve this purpose, on the one hand, the present invention provides an automatic welding and pipe threading device for fine thermocouple wires, comprising:

[0005] Loading and unloading mechanism, pipe threading mechanism, rotary wire feeding mechanism, shearing mechanism and spot welding machine;

[0006] The loading and unloading mechanism comprises a roller, and a plurality of placement grooves are evenly distributed in the circumference of the roller, and the placement grooves are used to place the U-shaped quartz tubes;

[0007] The tube-threading mechanism is located upstream of the loading and unloading mechanism, and includes a linear walking unit and a U-shaped platform. The linear walking unit includes a tube-threading electromagnetic tweezers, and the tube-threading electromagnetic tweezers are used to clamp the fine thermocouple wire and insert it into the U-shaped quartz tube. The tube-threading electromagnetic tweezers are provided with a centering module, and the U-shaped platform is provided with a lifting structure. The centering module uses the lifting structure to align the fine thermocouple wire with the inlet center of the U-shaped quartz tube;

[0008] The rotating wire feeding mechanism is located upstream of the tube threading mechanism, and the rotating wire feeding mechanism includes two wire feeding modules, and the two wire feeding modules form an angle no greater than 90 degrees.

[0009] Preferably, the tube-penetrating electromagnetic tweezers include two tweezers and a tube-penetrating electromagnet, the top ends of the two tweezers are fitted and fixed, one of the tweezers is fixed with the tube-penetrating electromagnet, the centering module includes two micro-axes and each of the tweezers has symmetrically arranged strip holes at the end, the end where the two strip holes are close to each other is narrower than the end where the two strip holes are far away from each other, both ends of each of the micro-axes are thicker than the middle, the two micro-axes are respectively inserted in the two symmetrically arranged strip holes, and each of the micro-axes spans the opposite strip holes of the two tweezers, and the lifting structure is used to control the lifting and lowering of the lower micro-axes.

[0010] Preferably, the opening of the U-shaped platform faces the rotating wire feeding mechanism, and a groove track is provided on the top of the U-shaped platform, and the groove track gradually narrows toward the rotating wire feeding mechanism, and the ends of the two tweezers of the tube-threading electromagnetic tweezers can slide along the inner side of the groove track to make the opening at the end between the two tweezers larger or smaller;

[0011] The lifting structure includes two lifting rails arranged inside the groove rail, the lifting rails extend toward the direction of the rotating wire feeding mechanism and gradually rise, and the two ends of the lower fine shaft are respectively slidably connected to the two lifting rails; or,

[0012] The lifting structure includes a top surface of the U-shaped platform that gradually rises toward the rotating wire feeding mechanism, and two ends of the lower fine shaft are placed on the top surface of the U-shaped platform.

[0013] Preferably, a U-shaped platform forward duct is also provided on the top of the U-shaped platform, and the U-shaped platform forward duct is located between the tube threading electromagnetic tweezers and the rotating wire feeding mechanism, and the axis line of the U-shaped platform forward duct is colinear with the axis line of the U-shaped quartz tube inlet.

[0014] Preferably, the linear travel unit further comprises a linear travel guide rail and a linear travel slider, the linear travel slider is slidably connected to the linear travel guide rail, and the top end of the tube-penetrating electromagnetic tweezers is fixed to the linear travel slider.

[0015] Preferably, the loading and unloading mechanism also includes a protective cover, a loading bin, a unloading bin, a spare unloading bin, an loading and unloading motor, and an loading and unloading motor fixing frame. The protective cover covers the outside of the drum and there is a gap between the protective cover and the drum. The protective cover is respectively connected with the loading bin, the unloading bin and the spare unloading bin. The loading and unloading motor is fixed on the loading and unloading motor fixing frame, and the main shaft of the loading and unloading motor is connected to the axis of the drum.

[0016] Preferably, the rotary wire feeding mechanism also includes a rotary motor, a rotary motor fixing frame, and a cylindrical rotating table. The rotary motor is fixed to the rotary motor fixing frame, and the main shaft of the rotary motor is connected to the axis of the cylindrical rotating table. The thickness of the cylindrical rotating table close to the U-shaped table is lower than the thickness of the cylindrical rotating table away from the U-shaped table. The side of the cylindrical rotating table close to the U-shaped table is embedded in the opening of the U-shaped table with a gap, and the cylindrical rotating table is connected to the two wire feeding modules.

[0017] Preferably, the wire feeding module includes a crossbeam, an even-wire roller shaft, a tray, a straightener, a tensioning guide roller and a micro-motion compensator, the two ends of the crossbeam are respectively connected to the cylindrical rotating table and the even-wire roller shaft, the tray is fixedly connected to the even-wire roller shaft, the straightener and the tensioning guide roller are both fixed to the crossbeam, the micro-motion compensator is fixed to the cylindrical rotating table, the fine thermocouple wire extends from the fine thermocouple wire coil rotatably connected to the even-wire roller shaft and passes through the straightener, the tensioning guide roller and the micro-motion compensator in sequence.

[0018] Preferably, the micro-motion compensator includes a fixed frame, micro-motion compensation electromagnetic tweezers, a reset spring, a micro-motion compensation electromagnet and an adjusting screw. The fixed frame includes a vertical fixing plate and an L-shaped fixing plate arranged side by side. The fixed frame also includes four horizontal guide rods. The bottom plate of the L-shaped fixing plate is fixed to the cylindrical rotating table. The two ends of each of the horizontal guide rods are respectively connected to the vertical fixing plate and the vertical plate of the L-shaped fixing plate. The four horizontal guide rods are arranged in a square. The micro-motion compensation electromagnetic tweezers are slidably connected to the horizontal guide rods. There is at least one reset spring. The two ends of each of the reset springs are respectively connected to the micro-motion compensation electromagnetic tweezers and the vertical plate of the L-shaped fixing plate. The micro-motion compensation electromagnet is fixed to the vertical fixing plate. The adjusting screw is rotatably connected to the vertical plate of the L-shaped fixing plate to control the stroke of the micro-motion compensation electromagnetic tweezers to the vertical fixing plate.

[0019] On the other hand, the present invention provides a method for using an automatic welding and pipe threading device for fine thermocouple wires, wherein the automatic welding and pipe threading device for fine thermocouple wires comprises a loading and unloading mechanism, a pipe threading mechanism, a rotating wire feeding mechanism, a shearing mechanism, and a spot welding machine. The loading and unloading mechanism comprises a roller, a protective cover, a loading bin, a unloading bin, an loading and unloading motor, and an loading and unloading motor fixing frame. A plurality of placement grooves are evenly distributed in the circumference of the roller, and the placement grooves are used to place U-shaped quartz tubes. The protective cover is covered on the outside of the roller and there is a gap between the protective cover and the roller. The protective cover is respectively connected to the loading bin and the unloading bin, and the loading and unloading motor is fixed on The main shaft of the loading and unloading motor is connected to the axis of the roller on the loading and unloading motor fixing frame, the tube threading mechanism is located upstream of the loading and unloading mechanism, the tube threading mechanism includes a linear walking unit and a U-shaped platform, the linear walking unit includes a tube threading electromagnetic tweezers and a linear walking slider, the tube threading electromagnetic tweezers include two tweezers and a tube threading electromagnet, the top ends of the two tweezers are fitted and consolidated, one of the tweezers is fixed with the tube threading electromagnet, the tube threading electromagnetic tweezers are provided with a centering module, the centering module is used to align the fine thermocouple wire with the inlet center of the U-shaped quartz tube, the top end of the tube threading electromagnetic tweezers is fixed to the linear A walking slider, a U-shaped platform forward guide tube is provided on the top of the U-shaped platform, the U-shaped platform forward guide tube is located between the tube threading electromagnetic tweezers and the rotating wire feeding mechanism, the axis line of the U-shaped platform forward guide tube is colinear with the axis line of the U-shaped quartz tube inlet, the rotating wire feeding mechanism is located upstream of the tube threading mechanism, the rotating wire feeding mechanism includes two wire feeding modules and the two wire feeding modules form an angle of no more than 90 degrees, the rotating wire feeding mechanism also includes a rotating motor, a rotating motor fixing frame and a cylindrical rotating platform, the rotating motor is fixed to the rotating motor fixing frame, the main shaft of the rotating motor is connected to the axis of the cylindrical rotating platform, The cylindrical rotating table is connected to the two wire feeding modules, and the wire feeding modules include a crossbeam, an even-wire roller shaft, a straightener, a tensioning guide roller and a micro-motion compensator. The two ends of the crossbeam are respectively connected to the cylindrical rotating table and the even-wire roller shaft. The straightener and the tensioning guide roller are both fixed to the crossbeam. The micro-motion compensator is fixed to the cylindrical rotating table. The micro-motion compensator includes micro-motion compensation electromagnetic tweezers. The shearing mechanism includes two scissors, one of which is located between the roller and the tube-threading electromagnetic tweezers, and the other is located between the U-shaped table forward guide tube and the micro-motion compensator. The method includes the following steps:

[0020] Step 1: Turn on the power switch, set the parameters, place two kinds of fine thermocouple wire coils on the two wire roller shafts respectively, set the fine thermocouple wire extended from the wire feeding module and the forward guide tube of the U-shaped platform to be in the same straight line as the working position, and reset the loading and unloading mechanism, the pipe threading mechanism and the shearing mechanism to the initial position;

[0021] Step 2: The rotary motor is started to make one of the wire feeding modules located at the working position, and a fine thermocouple wire is pulled out from the fine thermocouple wire coil of the wire feeding module located at the working position and sequentially passes through the tensioning guide roller, the straightener, the micro-motion compensator, the forward guide tube of the U-shaped table, the end of the tube-penetrating electromagnetic tweezers, and passes over the first fixed length L1 at the end of the tube-penetrating electromagnetic tweezers;

[0022] Step 3: another type of the micro-thermocouple wire is pulled out from the micro-thermocouple wire coil that is not located at the working position and sequentially passes through the tensioning guide roller, the straightener, and the micro-motion compensator of the wire feeding module that is not located at the working position, and passes over the second fixed length of the micro-thermocouple wire located at the working position, and the two types of the micro-thermocouple wires are overlapped;

[0023] Step 4: the spot welding machine is started, and the spot welding machine performs welding, and the overlapping point of the two fine thermocouple wires is the welding point;

[0024] Step 5: The rotating motor is started to drive the cylindrical rotating table to rotate the angle, so that the wire feeding module that is not located at the working position is rotated to the working position, the tube-penetrating electromagnet is energized, and the tube-penetrating electromagnetic tweezers clamp the welded fine thermocouple wire;

[0025] Step 6: The scissors between the U-shaped platform forward guide tube and the micro-motion compensator are started to cut off the fine thermocouple wire that is not located at the working position and leave a third fixed length to the welding point;

[0026] Step 7: The linear walking unit is started, and the linear walking slider moves forward, driving the tube-threading electromagnetic tweezers to deliver the welded fine thermocouple wire into the empty U-shaped quartz tube. The tube-threading electromagnet loses power, and the tube-threading electromagnetic tweezers release the fine thermocouple wire. After the linear walking slider moves in the opposite direction to the set point, the tube-threading electromagnet is energized, and the linear walking slider reciprocates at a fixed step length S. The tube-threading electromagnet loses power when it moves to the U-shaped quartz tube, and is energized when it moves to the set point. After the linear walking slider reciprocates m times at the step length S, the position The scissors between the roller and the tube-threading electromagnetic tweezers are started to cut off the fine thermocouple wire at the working position and leave a fourth fixed length L2. After the linear moving slider reciprocates n times according to the step length S, the remaining length M of the fine thermocouple wire to be threaded is M, and m is less than n, and M is less than S. m is obtained by the following formula: L+2T-L1=mS+L2, and n is obtained by the following formula: L+2T-L1=nS+M, wherein L is the total length of the U-shaped quartz tube threaded, and T is the length of the fine thermocouple wire extending from the end of the U-shaped quartz tube after cutting;

[0027] Step 8: After the pipe threading is completed, the linear moving slider moves in the opposite direction to the initial position, and the end of the fine thermocouple wire cut off at the working position is threaded into the centering module of the pipe threading electromagnetic tweezers, and the length beyond the end of the pipe threading electromagnetic tweezers is L1;

[0028] Step 9: The loading and unloading motor is started, and the drum rotates, so that the U-shaped quartz tube equipped with the fine thermocouple wire enters the unloading bin, and the axis line of the inlet of the next empty U-shaped quartz tube is collinear with the axis line of the forward guide tube of the U-shaped table;

[0029] Step 10: the micro-motion compensator that is not located at the working position is started, and the micro-motion compensation electromagnetic tweezers drive the fine thermocouple wire that is not located at the working position to pass over the second fixed length of the fine thermocouple wire located at the working position;

[0030] Step 11: Repeat steps 4 to 10 until all product processing is completed.

[0031] Beneficial effects of the present invention: the present invention provides an automatic welding and pipe threading device for fine thermocouple wires and a method of use, the pipe threading electromagnetic tweezers can clamp the fine thermocouple wires, the linear travel unit can accurately control the movement of the pipe threading electromagnetic tweezers to accurately control the pipe threading length of the fine thermocouple wires, the centering module of the pipe threading electromagnetic tweezers can align the fine thermocouple wires with the inlet center of the U-shaped quartz tube, the device is easy to operate and does not waste materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a top view of the automatic welding and pipe threading device for fine thermocouple wires of the present invention;

[0033] Figure 2 It is a front view of the automatic welding and pipe threading device for fine thermocouple wires of the present invention;

[0034] Figure 3 It is a schematic diagram of the loading and unloading mechanism of the present invention;

[0035] Figure 4 It is a schematic diagram of the pipe threading mechanism of the present invention;

[0036] Figure 5 Schematic diagram of the electromagnetic tweezers for penetrating a tube according to the present invention Figure 1 ;

[0037] Figure 6 Schematic diagram of the electromagnetic tweezers for penetrating a tube according to the present invention Figure 2 ;

[0038] Figure 7 It is a schematic diagram of the U-shaped platform of the present invention;

[0039] Figure 8 is a schematic diagram of a rotary wire feeding mechanism of the present invention;

[0040] Fig. 9 Schematic diagram of the micro-motion compensator of the present invention Figure 1 ;

[0041] Fig.10 Schematic diagram of the micro-motion compensator of the present invention Figure 2 ;

[0042] Fig.11 is a schematic diagram of the shearing mechanism of the present invention;

[0043] Fig.12 It is a schematic diagram of the pipe threading process parameter calculation of the present invention;

[0044] Fig.13 The schematic diagram of the micro thermocouple wire in the automatic welding and pipe threading device of the present invention during one cycle of operation Figure 1 ;

[0045] Fig.14 The schematic diagram of the micro thermocouple wire in the automatic welding and pipe threading device of the present invention during one cycle of operation Figure 2 ;

[0046] Fig.15 The schematic diagram of the micro thermocouple wire in the automatic welding and pipe threading device of the present invention during one cycle of operation Figure 3 ;

[0047] Fig.16 It is a schematic diagram of the lifting structure of the present invention. Figure 1 ;

[0048] Fig.17 It is a schematic diagram of the lifting structure of the present invention. Figure 2 .

[0049] In the figure: 1. Loading and unloading mechanism; 11. Roller; 111. Placement groove; 12. Protective cover; 13. Loading bin; 14. Unloading bin; 15. Spare unloading bin; 16. Loading and unloading motor; 17. Loading and unloading motor fixing frame; 18. Loading bin fixing frame; 19. Unloading bin fixing frame; 2. Pipe threading mechanism; 21. Linear travel unit; 211. Pipe threading electromagnetic tweezers; 2111. Centering module; 21111. Fine axis; 2112. Tweezers; 21121. Strip hole; 2113, tube-penetrating electromagnet; 2114, mounting pin hole; 212, linear travel guide rail; 213, linear travel slider; 22, linear travel unit fixing frame; 221, fixing rod; 23, U-shaped table; 231, groove track; 232, U-shaped table forward guide tube; 2321, fixing block; 233, lifting structure; 24, U-shaped table fixing frame; 3, rotating wire feeding mechanism; 31, wire feeding module; 311, crossbeam; 312, even wire roller shaft; 31 3. Tray; 314. Straightener; 315. Tension guide roller; 316. Micro-motion compensator; 3161. Fixing frame; 31611. Vertical fixing plate; 316111. Guide tube; 31612. L-shaped fixing plate; 31613. Horizontal guide rod; 3162. Micro-motion compensation electromagnetic tweezers; 3163. Reset spring; 3164. Micro-motion compensation electromagnet; 3165. Adjustment screw; 32. Rotating motor; 33. Rotating motor fixing frame; 331. Fixing Fixed frame vertical plate; 332, fixed frame horizontal plate; 333, motor fixing plate; 334, circular boss; 34, cylindrical rotating table; 4, shearing mechanism; 41, scissors; 411, scissors base; 4111, connecting plate; 4112, bottom block; 4113, lower blade; 412, scissors electromagnet; 4121, upper blade; 413, electromagnet guide rod; 414, semicircular notch; 42, scissors fixing frame; 43, cylinder fixing plate; 44, cylinder; 5, bottom plate. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0054] The automatic welding and pipe threading device and the use method of the fine thermocouple wire provided by the present invention are used for welding and pipe threading of the fine thermocouple wire. The fine thermocouple wire is easy to center, the pipe threading length is accurately controlled, and the process is simple and does not waste materials. The automatic welding and pipe threading device and the use method of the fine thermocouple wire described above are described below with specific embodiments.

[0055] like Figures 1 to 17As shown, the automatic welding and tube-threading device for fine thermocouple wires provided in this embodiment includes a loading and unloading mechanism 1, a tube-threading mechanism 2, a rotary wire feeding mechanism 3, a shearing mechanism 4 and a spot welding machine; wherein the loading and unloading mechanism 1 is used to load an empty U-shaped quartz tube and unload a U-shaped quartz tube loaded with fine thermocouple wires, the loading and unloading mechanism 1 includes a roller 11, and the roller 11 is evenly distributed with a plurality of placement grooves 111 in the circumferential direction, and the placement grooves 111 are used to place the U-shaped quartz tube; the tube-threading mechanism 2 is located upstream of the loading and unloading mechanism 1, and is used for tube-threading of fine thermocouple wires, and the tube-threading mechanism 2 includes a linear walking unit 21, which is used to ensure the accuracy of the tube-threading length of the fine thermocouple wires, and the linear walking unit 21 is used to ensure the accuracy of the tube-threading length of the fine thermocouple wires. The wire walking unit 21 includes a tube-threading electromagnetic tweezers 211, which is used to clamp the fine thermocouple wire and insert it into the U-shaped quartz tube. The tube-threading mechanism 2 also includes a U-shaped platform 23, and the U-shaped platform 23 is provided with a lifting structure 233. The tube-threading electromagnetic tweezers 211 is provided with a centering module 2111, and the centering module 2111 uses the lifting structure 233 to align the fine thermocouple wire with the inlet center of the U-shaped quartz tube; the rotating wire feeding mechanism 3 is located upstream of the tube-threading mechanism 2, and is used to convey the fine thermocouple wire. The rotating wire feeding mechanism 3 includes two wire feeding modules 31, which are used to convey the fine thermocouple wire, and the two wire feeding modules 31 are at an angle not greater than 90 degrees.

[0056] When the automatic welding and pipe threading device for fine thermocouple wires of this embodiment is working, the two fine thermocouple wires to be welded are respectively placed on the two wire feeding modules 31, and the two wire feeding modules 31 can be alternately in the working position (refer to Figure 1 AA direction in the middle), after the two kinds of fine thermocouple wires reach the predetermined positions respectively, the spot welding machine is started to complete the welding of the two kinds of fine thermocouple wires, the tube-threading electromagnetic tweezers 211 clamp the welded fine thermocouple wire, and the centering module 2111 of the tube-threading electromagnetic tweezers 211 can use the lifting structure 233 of the U-shaped platform 23 to align the fine thermocouple wire with the inlet center of the U-shaped quartz tube, the shearing mechanism 4 is started to cut off the fine thermocouple wire that is not in the working position, the linear walking unit 21 is started to accurately control the movement of the tube-threading electromagnetic tweezers 211 to accurately control the tube-threading length of the fine thermocouple wire, after the fine thermocouple wire is threaded, the shearing mechanism 4 is started to cut off the fine thermocouple wire in the working position, and the two wire feeding modules 31 are alternately in the working position, and the above process is repeated until all product processing is completed. This device is simple to operate and does not waste materials.

[0057] like Figure 1 to Figure 2 As shown, the automatic welding and pipe threading device for the fine thermocouple wire of this embodiment also includes a base plate 5, and the loading and unloading mechanism 1, the pipe threading mechanism 2, the rotary wire feeding mechanism 3, the shearing mechanism 4 and the spot welding machine are all arranged on the base plate 5. Through the base plate 5, the device has a high degree of integration and is easy to carry.

[0058] like Figures 1 to 3As shown, in this embodiment, the roller 11 can be cylindrical, and there can be 6 placement grooves 111 on the roller 11. The shape of the placement groove 111 can be U-shaped, which is used to position the U-shaped quartz tube. The depth of the placement groove 111 is half of the outer tube diameter of the U-shaped quartz tube, which is convenient for the centering of the fine thermocouple wire.

[0059] In this embodiment, Fig.12 As shown, the U-shaped quartz tube includes an arc segment, a short straight segment and a long straight segment, the short straight segment and the long straight segment are respectively located at the two ends of the arc segment, the length of the long straight segment is greater than the length of the short straight segment, and the openings of the short straight segment and the long straight segment can both serve as the inlet of the U-shaped quartz tube. Specifically, in two adjacent tube-threading processes, in the first tube-threading, the opening of the short straight segment serves as the inlet of the U-shaped quartz tube, and in the second tube-threading, the opening of the long straight segment serves as the inlet of the U-shaped quartz tube, or, in the first tube-threading, the opening of the long straight segment serves as the inlet of the U-shaped quartz tube, and in the second tube-threading, the opening of the short straight segment serves as the inlet of the U-shaped quartz tube.

[0060] It is understandable that, in order to facilitate the placement of the U-shaped quartz tube, the placement groove 111 is in a U-shape, and the outer contour of the placement groove 111 is slightly larger than the outer contour of the U-shaped quartz tube. The placement groove 111 includes an arc groove and two straight grooves, the two straight grooves are respectively located at the two ends of the arc groove, and the lengths of the two straight grooves are equal. By setting two straight grooves of equal length, it is convenient to place a U-shaped quartz tube with short straight segments and long straight segments at both ends. Of course, a U-shaped quartz tube with long straight segments at both ends can also be placed, and a U-shaped quartz tube with short straight segments at both ends can also be placed. Further, when placing the U-shaped quartz tube, the vertex of the arc segment is used as the positioning reference point. It is also understandable that adjacent U-shaped quartz tubes need to be placed in a mirror-symmetrical manner. At this time, the angle of rotation of the drum 11 each time is the same, which can correspond to the placement of the U-shaped quartz tube, which is convenient for operation.

[0061] like Figures 1 to 3As shown, in this embodiment, the loading and unloading mechanism 1 also includes a protective cover 12, an upper material bin 13, a lower material bin 14, a spare lower material bin 15, an upper and lower material motor 16, an upper and lower material motor fixing frame 17, an upper material bin fixing frame 18 and a lower material bin fixing frame 19. The protective cover 12 covers the outside of the drum 11 and there is a gap between the drum 11 and the protective cover 12. The protective cover 12 is used to protect the fine thermocouple wire. The protective cover 12 is connected with the upper material bin 13, the lower material bin 14 and the spare lower material bin 15 respectively, and is used for the transportation of U-shaped quartz tubes. The protective cover 12 and the upper material bin 13, the lower material bin 14 and the spare lower material bin 15 are all detachable for easy replacement. The upper material bin 13 can be cylindrical, and the upper material bin 13 is fixed on the upper material bin fixing frame 18. The upper material bin fixing frame 18 is fixed on the side of the bottom plate 5. The entrance of the upper material bin 13 is higher than the exit, which is convenient for the transportation of U-shaped quartz tubes. The unloading bin 14 can be cylindrical, and the unloading bin 14 is fixed under the unloading bin fixing frame 19, and the unloading bin fixing frame 19 is fixed on the side of the bottom plate 5. The entrance of the unloading bin 14 is higher than the exit, which is convenient for the transportation of the U-shaped quartz tube. The spare unloading bin 15 can be cylindrical, and is arranged at the bottom of the protective cover 12. The other end of the spare unloading bin 15 is movable and detachable relative to the bottom plate 5. The spare unloading bin 15 is used to receive the U-shaped quartz tube that has not been unloaded in time, and at the same time supports the protective cover 12. The loading and unloading motor 16 is fixed on the loading and unloading motor fixing frame 17, and the loading and unloading motor fixing frame 17 is fixed on the bottom plate 5. The main shaft of the loading and unloading motor 16 is connected to the axis of the roller 11. For example, the main shaft of the loading and unloading motor 16 is connected to the axis of the roller 11 by a key, which is stable and easy to disassemble and assemble.

[0062] As a preferred technical solution, Figures 5 and 6As shown, the tube-penetrating electromagnetic tweezers 211 include two tweezers 2112 and a tube-penetrating electromagnet 2113. The top ends of the two tweezers 2112 are fitted and consolidated, and one of the tweezers 2112 is fixed with a tube-penetrating electromagnet 2113 for magnetically attracting the other tweezers 2112 to complete the clamping of the fine thermocouple wire. The centering module 2111 includes two fine shafts 21111 and each tweezer piece 2112 has a symmetrically arranged strip hole 21121 at the end, the end of the two strip holes 21121 that are close to each other is narrower than the end of the two strip holes 21121 that are far away from each other, and both ends of each fine shaft 21111 are thicker than the middle. The two fine shafts 21111 are respectively inserted into the two symmetrically arranged strip holes 21121, and each fine shaft 21111 spans the opposite strip holes 21121 of the two tweezer pieces 2112. The lifting structure 233 is used to control the lifting and lowering of the lower fine shaft 21111. When the tube-threading electromagnetic tweezers 211 moves toward the rotating wire feeding mechanism 3, the ends of the two tweezers 2112 are controlled to be close to each other, and the opening at the ends between the two tweezers 2112 becomes smaller, and the two fine shafts 21111 are brought closer to each other, wherein the upper fine shaft 21111 moves downward by gravity, and the lower fine shaft 21111 moves upward by the lifting structure 233, thereby correcting the fine thermocouple wire between the two fine shafts 21111 to the central position, thereby ensuring that the fine thermocouple wire can be strictly aligned when threading the tube.

[0063] like Figures 1 to 4 As shown, in this embodiment, the pipe threading mechanism 2 also includes a linear travel unit fixing frame 22, and the linear travel unit fixing frame 22 includes two fixing rods 221, and the two fixing rods 221 are arranged side by side, and the bottom ends of the two fixing rods 221 are fixed on the bottom plate 5, and the top ends of the two fixing rods 221 fix the linear travel unit 21.

[0064] As a preferred technical solution, Figures 1 to 6 As shown, the linear travel unit 21 also includes a linear travel guide rail 212 and a linear travel slider 213. The linear travel guide rail 212 is fixed to the top of the two fixed rods 221, and the linear travel slider 213 is slidably connected to the linear travel guide rail 212. The top of the tube-penetrating electromagnetic tweezers 211 is fixed to the linear travel slider 213. Through the linear travel guide rail 212 and the linear travel slider 213, the tube-penetrating electromagnetic tweezers 211 can move in a straight line, and it is convenient to accurately control the tube-penetrating length of the fine thermocouple wire. Furthermore, the tube-penetrating electromagnetic tweezers 211 are fixed to the linear travel slider 213 through the mounting pin holes 2114 at the top of the two tweezers clamps 2112.

[0065] like Figures 1 to 7As shown, in this embodiment, the opening of the U-shaped platform 23 faces the rotating wire feeding mechanism 3, and a groove track 231 is provided on the top of the U-shaped platform 23. The groove track 231 gradually narrows toward the rotating wire feeding mechanism 3, and the ends of the two tweezers 2112 of the tube-threading electromagnetic tweezers 211 can slide along the inner side of the groove track 231 to make the opening at the end between the two tweezers 2112 larger or smaller. It can be understood that the width of the groove track 231 close to one end of the rotating wire feeding mechanism 3 is equal to the size of the end opening between the two tweezers 2112 when it is closed. Further, in this embodiment, Figure 16 to Figure 17 As shown, the lifting structure 233 includes two lifting rails arranged inside the groove track 231. The lifting rails extend toward the direction of the rotating wire feeding mechanism 3 and gradually rise. The two ends of the lower fine shaft 21111 are respectively slidably connected to the two lifting rails. When the tube-threading electromagnetic tweezers 211 move toward the rotating wire feeding mechanism 3, the narrowed groove track 231 can make the ends of the two tweezers 2112 close together, and the opening at the ends between the two tweezers 2112 becomes smaller, so that the two fine shafts 21111 are close to each other, wherein the upper fine shaft 21111 moves downward by gravity, and the lower fine shaft 21111 moves upward by the lifting rails, thereby completing the alignment of the fine thermocouple wire.

[0066] It can be understood that in other embodiments, the lifting structure 233 can also include a top surface of a U-shaped table 23 that gradually rises toward the rotating wire feeding mechanism 3, and both ends of the lower fine shaft 21111 are placed on the top surface of the U-shaped table 23. When the tube-threading electromagnetic tweezers 211 moves toward the rotating wire feeding mechanism 3, the gradually rising top surface of the U-shaped table 23 causes the lower fine shaft 21111 to move upward.

[0067] It is understandable that the highest point of the lifting track is lower than the top surface of the U-shaped platform 23. When the tube-threading electromagnetic tweezers 211 moves along the lifting track toward the rotating wire feeding mechanism 3 to the highest point of the lifting track, the lifting track cannot lift the lower fine shaft 21111 to the highest position. Both fine shafts 21111 are magnetic and have opposite magnetism, which is conducive to the closeness of the two fine shafts 21111. It should be noted that the highest point of the lifting track does not exceed the top surface of the U-shaped platform 23. This is because the two fine shafts 21111 are extremely close to each other, which is completely realized by the lifting track, which is difficult to process and not beautiful.

[0068] Furthermore, the two tweezers 2112 are both made of elastic non-magnetic material. When the tube-threading electromagnetic tweezers 211 are away from the rotating wire feeding mechanism 3, the opening at the ends of the two tweezers 2112 becomes larger due to the elastic effect, which can offset the magnetic force between the two fine shafts 21111 and drive the two fine shafts 21111 to move away from each other.

[0069] like Figures 1 to 7As shown, in this embodiment, a U-shaped platform forward conduit 232 is also provided on the top of the U-shaped platform 23. The U-shaped platform forward conduit 232 is located between the tube-threading electromagnetic tweezers 211 and the rotating wire feeding mechanism 3. The axis of the U-shaped platform forward conduit 232 is colinear with the axis of the inlet of the U-shaped quartz tube. The U-shaped platform forward conduit 232 is used to cooperate with the adjustment of the reciprocating motion step length of the tube-threading electromagnetic tweezers 211. The fixed block 2321 of the U-shaped platform forward conduit 232 can move on the surface of the U-shaped platform 23, and is used to adjust the distance between the tip of the U-shaped platform forward conduit 232 and the end face of the tube-threading electromagnetic tweezers 211. Further, the tube-threading mechanism 2 also includes a U-shaped platform fixing frame 24, and the U-shaped platform 23 is fixed on the U-shaped platform fixing frame 24, and the U-shaped platform fixing frame 24 is fixed on the bottom plate 5.

[0070] like Figures 1 to 8 As shown, in this embodiment, the rotary wire feeding mechanism 3 also includes a rotary motor 32, a rotary motor fixing frame 33, and a cylindrical rotating table 34. The fixing frame of the rotary motor 32 includes a fixing frame vertical plate 331, a fixing frame horizontal plate 332, a motor fixing plate 333, and a circular boss 334. There are two fixing frame vertical plates 331, and the two fixing frame vertical plates 331 are arranged side by side. The bottom ends of the two fixing frame vertical plates 331 are fixed on the bottom plate 5, the fixing frame horizontal plate 332 is fixed on the top of the two fixing frame vertical plates 331, the motor fixing plate 333 is fixed on the fixing frame horizontal plate 332, and the circular boss 334 is fixed on the motor fixing plate 333. The rotary motor 32 is fixed on the motor fixing plate 333 of the rotary motor fixing frame 33, and the main shaft of the rotary motor 32 is connected to the axis of the cylindrical rotating table 34. For example, the main shaft of the rotary motor 32 and the axis of the cylindrical rotating table 34 are connected by a key, which is stable and easy to disassemble and assemble. Exemplarily, a bearing seat is provided inside the circular boss 334 to facilitate the rotation of the cylindrical rotating platform 34. The thickness of the cylindrical rotating platform 34 on the side close to the U-shaped platform 23 is lower than the thickness of the side of the cylindrical rotating platform 34 away from the U-shaped platform 23. The side of the cylindrical rotating platform 34 close to the U-shaped platform 23 is embedded in the opening of the U-shaped platform 23 with a gap, which can not only ensure the rotation of the cylindrical rotating platform 34, but also make the rotating wire feeding mechanism 3 and the pipe threading mechanism 2 more compact.

[0071] As a preferred technical solution, Figures 1 to 8As shown, the cylindrical rotating table 34 is connected to two wire feeding modules 31, and the wire feeding module 31 includes a crossbeam 311, a wire roller shaft 312, a tray 313, a straightener 314, a tension guide roller 315 and a micro-motion compensator 316. The two ends of the crossbeam 311 are respectively connected to the cylindrical rotating table 34 and the wire roller shaft 312, the tray 313 is fixedly connected to the wire roller shaft 312, the straightener 314 and the tension guide roller 315 are both fixed to the crossbeam 311, and the micro-motion compensator 316 is fixed to the cylindrical rotating table 34. The fine thermocouple wire extends from the fine thermocouple wire coil that is rotatably connected to the wire roller shaft 312 and passes through the straightener 314, the tension guide roller 315 and the micro-motion compensator in sequence. The tray 313 can hold the fine thermocouple wire coil, and the straightener 314 is used to ensure the straightness of the fine thermocouple wire. Furthermore, a guide ring is provided on the top of the tensioning guide roller 315 , which is used to guide the fine thermocouple wire to the middle of the tensioning guide roller 315 when the fine thermocouple wire is wound and unwound higher than the upper end surface of the tensioning guide roller 315 .

[0072] like Figures 9 and 10As shown, in this embodiment, the micro-motion compensator 316 includes a fixed frame 3161, micro-motion compensation electromagnetic tweezers 3162, a reset spring 3163, a micro-motion compensation electromagnet 3164 and an adjustment screw 3165. The fixed frame 3161 includes a vertical fixed plate 31611 and an L-shaped fixed plate 31612 arranged side by side, and the fixed frame 3161 also includes four horizontal guide rods 31613, the bottom plate of the L-shaped fixed plate 31612 is fixed on the cylindrical rotating table 34, and the two ends of each horizontal guide rod 31613 are respectively connected to the vertical plates of the vertical fixed plate 31611 and the L-shaped fixed plate 31612, and the four horizontal guide rods 31613 are arranged in a square shape. The micro-motion compensation electromagnetic tweezers 3162 are slidably connected to the horizontal guide rod 31613, and are used to clamp the fine thermocouple wire to realize the micro-feeding of the fine thermocouple wire, so as to complete the overlap of the two fine thermocouple wires. There is at least one reset spring 3163, and illustratively, there can be two reset springs. The two ends of each reset spring 3163 are respectively connected to the micro-compensation electromagnetic tweezers 3162 and the vertical plate of the L-shaped fixed plate 31612. The reset spring 3163 can restore the micro-compensation electromagnetic tweezers 3162 to its original position, waiting for the next clamping of the fine thermocouple wire. The micro-compensation electromagnet 3164 is fixed on the vertical fixed plate 31611, and is used to magnetically attract the micro-compensation electromagnetic tweezers 3162 to achieve micro-feeding of the fine thermocouple wire. The adjustment screw 3165 is rotatably connected to the vertical plate of the L-shaped fixed plate 31612 to control the stroke of the micro-compensation electromagnetic tweezers 3162 to the vertical fixed plate 31611, thereby accurately controlling the feed amount of the fine thermocouple wire. Preferably, the L-shaped fixing plate 31612 can be moved on the cylindrical rotating table 34, so as to adjust the position when the adjusting screw 3165 cannot meet the feed amount requirement of the fine thermocouple wire. Furthermore, a guide tube 316111 is also provided on the vertical fixing plate 31611, and the guide tube 316111 is aligned with the end of the micro-motion compensation electromagnetic tweezers 3162 to ensure the straightness of the fine thermocouple wire. It can be understood that the structure of the micro-motion compensation electromagnetic tweezers 3162 is consistent with the structure of the tube-penetrating electromagnetic tweezers 211, which is used to ensure the straightness of the fine thermocouple wire, and will not be repeated here.

[0073] like Figure 1 and Fig.11 As shown, in this embodiment, the shearing mechanism 4 includes two scissors 41, one of the scissors 41 is located between the roller 11 and the tube-threading electromagnetic tweezers 211, and is used to cut the fine thermocouple wire that is not in the working position, and the other scissors 41 is located between the U-shaped table forward guide tube 232 and the micro-motion compensator 316, and is used to cut the fine thermocouple wire that is in the working position.

[0074] As a preferred technical solution, Fig.11As shown, the shearing mechanism 4 also includes a scissor fixing frame 42, a cylinder fixing plate 43, and two cylinders 44. The scissor fixing frame 42 is fixed on the bottom plate 5, the cylinder fixing plate 43 is fixed on the scissor fixing frame 42, the two cylinders 44 are fixed on the cylinder fixing plate 43, and the two scissors 41 are respectively fixed on the ends of the piston rods of the two cylinders 44. Further, the scissors 41 include a scissor base 411, and the scissor base 411 includes a connecting plate 4111, a bottom block 4112, and a lower blade 4113, one end of the connecting plate 4111 is fixed to the end of the piston rod of the cylinder 44, the other end of the connecting plate 4111 is fixed to the bottom block 4112, and the lower blade 4113 is fixed on the bottom block 4112. The scissors 41 also include a scissors electromagnet 412 and an electromagnet guide rod 413. There are at least two electromagnet guide rods 413. The two electromagnet guide rods 413 are arranged side by side on the scissors electromagnet 412. The electromagnet guide rod 413 is slidably connected to the bottom block 4112. The scissors electromagnet 412 is fixed with an upper blade 4121. The upper blade 4121 cooperates with the lower blade 4113 to cut the fine thermocouple wire. Furthermore, semicircular notches 414 are provided at corresponding positions of the upper blade 4121 and the lower blade 4113 to avoid cutting the fine thermocouple wire in the working position. When the scissors 41 perform a shearing action, the energized scissors electromagnet 412 moves toward the bottom block 4112 under the action of magnetic attraction, thereby completing the shearing action. The above-mentioned scissors 41 have a simple structure and are convenient for automatic operation.

[0075] The method for using the automatic welding and pipe threading device for fine thermocouple wires provided in this embodiment, using the automatic welding and pipe threading device for fine thermocouple wires, specifically includes the following steps:

[0076] Step 1: Turn on the power switch, set the parameters, place two types of fine thermocouple wire coils on the two wire roller shafts 312 respectively, set the fine thermocouple wire extended by the wire feeding module 31 and the U-shaped table forward guide tube 232 to be in the same straight line as the working position, and reset the loading and unloading mechanism 1, the pipe threading mechanism 2 and the shearing mechanism 4 to the initial position.

[0077] In this step, if Figures 1 to 17 As shown, first turn on the power switch to power the device, and set the parameters on the control panel of the device. The parameters are as follows:

[0078] The total length of the U-shaped quartz tube is L;

[0079] After cutting, the fine thermocouple wire at the end of the U-shaped quartz tube extends to a length T;

[0080] The distance L1 from the shearing point of the scissors 41 between the roller 11 and the electromagnetic tweezers 211 to the end of the electromagnetic tweezers 211;

[0081] The distance L2 from the end of the U-shaped quartz tube extending out of the fine thermocouple wire to the shearing point of the scissors 41 located between the roller 11 and the tube-piercing electromagnetic tweezers 211;

[0082] The reciprocating step length S of the linear moving slider 213;

[0083] When the scissors 41 located between the roller 11 and the electromagnetic forceps 211 for threading the tube are started, the linear moving slider 213 reciprocates m times according to the step length S;

[0084] The linear moving slider 213 reciprocates n times according to the step length S;

[0085] Angle α between the two wire feeding modules 31;

[0086] The feed distance of the even-wire fine motion compensator 316 is 2δ.

[0087] Then, two kinds of fine thermocouple wire coils are placed on the two wire roller shafts 312, namely, positive fine thermocouple wire and negative fine thermocouple wire. The fine thermocouple wire extended from the wire feeding module 31 and the U-shaped platform forward guide tube 232 are set to be in the working position (refer to Figure 1 AA direction in the drawing). The loading and unloading mechanism 1 is reset to the initial position, that is, a placement groove 111 on the roller 11 is at the top and aligned with the U-shaped platform forward guide tube 232, and an empty U-shaped quartz tube is stored in the placement groove 111, so that the inlet of the empty U-shaped quartz tube is aligned with the U-shaped platform forward guide tube 232. The tube threading mechanism 2 is reset to the initial position, that is, the distance from the end of the tube threading electromagnetic tweezers 211 to the shearing point of the scissors 41 located between the roller 11 and the tube threading electromagnetic tweezers 211 is L1, the tube threading electromagnet 2113 loses power, and the tube threading electromagnetic tweezers 211 is released. The shearing mechanism 4 is reset to the initial position, that is, the piston rod ends of the two cylinders 44 are retracted, and the scissors electromagnet 412 loses power.

[0088] Step 2: The rotating motor 32 is started to make one of the wire feeding modules 31 located in the working position. A fine thermocouple wire is pulled out from the fine thermocouple wire coil of the wire feeding module 31 located in the working position and passes through the tensioning guide roller 315, the straightener 314, the micro-motion compensator, the U-shaped table forward guide tube 232, the end of the tube-penetrating electromagnetic tweezers 211 of the wire feeding module 31 located in the working position in sequence, and passes over the first fixed length L1 at the end of the tube-penetrating electromagnetic tweezers 211.

[0089] In this step, if Figures 1 to 17 As shown, one of the wire feeding modules 31 is located at the working position. For example, the other wire feeding module 31 forms an angle α with the working position counterclockwise. The first fixed length of the fine thermocouple wire at the working position passing over the end of the tube-penetrating electromagnetic tweezers 211 is L1.

[0090] Step 3: Pull out another kind of fine thermocouple wire from the fine thermocouple wire roll that is not in the working position and pass through the tensioning guide roller 315, the straightener 314, and the micro-compensator of the wire feeding module 31 that is not in the working position in sequence, and pass over the second fixed length of the fine thermocouple wire in the working position, and the two kinds of fine thermocouple wires are overlapped.

[0091] In this step, if Figures 1 to 17 As shown, the second fixed length of the fine thermocouple wire that is not in the working position over the fine thermocouple wire that is in the working position is δ.

[0092] Step 4: Start the spot welding machine and start welding. The overlapping point of the two fine thermocouple wires is the welding point.

[0093] Step 5: The rotating motor 32 is started, driving the cylindrical rotating platform 34 to rotate the included angle, so that the wire feeding module 31 which is not in the working position is rotated to the working position, the tube-threading electromagnet 2113 is energized, and the tube-threading electromagnetic tweezers 211 clamp the welded fine thermocouple wire.

[0094] Step 6: The scissors 41 between the U-shaped platform forward guide tube 232 and the micro-motion compensator 316 are started to cut the fine thermocouple wire that is not in the working position and leave a third fixed length to the welding point.

[0095] In this step, if Figures 1 to 17 As shown, the cylinder 44 located between the U-shaped table forward guide tube 232 and the micro-compensator 316 is started, the piston rod is extended to a predetermined position, the scissor electromagnet 412 is energized, and the fine thermocouple wire that is not in the working position is cut off and a third fixed length δ to the welding point is left.

[0096] Step 7: The linear moving unit 21 is started, and the linear moving slider 213 moves forward, driving the tube-threading electromagnetic tweezers 211 to deliver the welded fine thermocouple wire into the empty U-shaped quartz tube. The tube-threading electromagnet 2113 loses power, and the tube-threading electromagnetic tweezers 211 release the fine thermocouple wire. After the linear moving slider 213 moves in the opposite direction to the set point, the tube-threading electromagnet 2113 is energized, and the linear moving slider 213 reciprocates at a fixed step length S. When the tube-threading electromagnet 2113 moves to the U-shaped quartz tube, it loses power. When the tube-threading electromagnet 2113 moves to the set point, it is energized, and the linear moving slider 213 moves back and forth at a fixed step length S. After the length S reciprocates m times, the scissors 41 located between the drum 11 and the tube-threading electromagnetic tweezers 211 are started, and the fine thermocouple wire at the working position is cut off and a fourth fixed length L2 is left. After the linear moving slider 213 reciprocates n times according to the step length S, the remaining length M of the fine thermocouple wire to be threaded is M, m is less than n, M is less than S, m is obtained by the following formula: L+2T-L1=mS+L2, n is obtained by the following formula: L+2T-L1=nS+M, wherein L is the total length of the U-shaped quartz tube threaded, and T is the length of the fine thermocouple wire extending from the end of the U-shaped quartz tube after cutting.

[0097] In this step, if Figures 1 to 17 As shown, since the first fixed length of the micro-thermocouple wire passing through the end of the tube-penetrating electromagnetic tweezers 211 is L1, the tube-penetrating electromagnetic tweezers 211 delivers the micro-thermocouple wire of L1 length into the U-shaped quartz tube in the first stroke of the linear moving slider 213. It can be understood that the setting of L1 is suitable for the micro-thermocouple wire not to bend when the tube-penetrating electromagnetic tweezers 211 delivers the micro-thermocouple wire of L1 length into the U-shaped quartz tube in the first stroke. After the linear moving slider 213 moves in the reverse direction to the set point, the step length of the reciprocating motion of the linear moving slider 213 is S. It can be understood that when the tube-penetrating electromagnetic tweezers 211 moves in the reverse direction driven by the linear moving slider 213, the narrowed groove track 231 can make the ends of the two tweezers clamps 2112 close to each other, and the opening at the end between the two tweezers clamps 2112 becomes smaller, thereby completing the centering of the micro-thermocouple wire.

[0098] In this step, if Figures 1 to 17 As shown, the position of the U-shaped platform forward guide tube 232 is movable, that is, the length of L2 is adjustable. When the linear moving slider 213 reciprocates m times according to the step length S, the cylinder 44 located between the roller 11 and the tube-threading electromagnetic tweezers 211 is started, the piston rod is extended to a predetermined position, and the scissor electromagnet 412 is energized to cut the fine thermocouple wire at the working position and leave a fourth fixed length L2.

[0099] In this step, if Fig.12 As shown, the total length of the U-shaped quartz tube through the tube is L, the extension length of the fine thermocouple wire at the end of the U-shaped quartz tube after cutting is T, the distance from the end point of the fine thermocouple wire at the end of the U-shaped quartz tube after cutting to the shearing point of the scissors 41 between the roller 11 and the tube-threading electromagnetic tweezers 211 is L2, and the distance from the shearing point of the scissors 41 between the roller 11 and the tube-threading electromagnetic tweezers 211 to the end of the tube-threading electromagnetic tweezers 211 is L1. It can be understood that m and n are both integers, and the forward movement stroke of the linear walking slider 213 for the n+1th time is MT.

[0100] It should be noted that when both ends of the U-shaped quartz tube are long straight segments or short straight segments, the m and n values ​​are calculated only once, and the m and n values ​​are used to control the movement of the linear moving slider 213. When both ends of the U-shaped quartz tube are short straight segments and long straight segments, and the opening of the short straight segment and the opening of the long straight segment are alternately used as the inlet of the U-shaped quartz tube, the m and n values ​​need to be calculated twice according to the above method due to the change of L2, and the movement of the linear moving slider 213 is alternately controlled according to the two sets of m and n values.

[0101] Step 8: After the pipe threading is completed, the linear moving slider 213 moves in the opposite direction to the initial position, and the end of the fine thermocouple wire cut at the working position is threaded into the centering module 2111 of the pipe threading electromagnetic tweezers 211, and the length beyond the end of the pipe threading electromagnetic tweezers 211 is L1.

[0102] Step 9: The loading and unloading motor 16 is started, and the drum 11 rotates, so that the U-shaped quartz tube equipped with fine thermocouple wires enters the unloading bin 14, and the axis line of the inlet of the next empty U-shaped quartz tube is in line with the axis line of the forward guide tube 232 of the U-shaped platform.

[0103] Step 10: The micro-motion compensator 316 that is not located at the working position is started, and the micro-motion compensation electromagnetic tweezers 3162 drives the fine thermocouple wire that is not located at the working position to pass the second fixed length of the fine thermocouple wire that is located at the working position.

[0104] In this step, if Figures 1 to 17 As shown, the electromagnet of the micro-motion compensation electromagnetic tweezers 3162 is energized to clamp the fine thermocouple wire, and the micro-motion compensation electromagnet 3164 is energized to magnetically attract the micro-motion compensation electromagnetic tweezers 3162 to move, driving the fine thermocouple wire not in the working position to cross the second fixed length δ of the fine thermocouple wire in the working position. Subsequently, the electromagnet of the micro-motion compensation electromagnetic tweezers 3162 is de-energized, the micro-motion compensation electromagnet 3164 is de-energized, and the micro-motion compensation electromagnetic tweezers 3162 returns to its original position under the action of the reset spring 3163.

[0105] Step 11: Repeat steps 4 to 10 until all product processing is completed.

[0106] It can be seen from the above embodiments that the automatic welding and pipe threading device and the use method of the fine thermocouple wire provided in this embodiment, the pipe threading electromagnetic tweezers 211 can clamp the fine thermocouple wire, the linear walking unit 21 can accurately control the movement of the pipe threading electromagnetic tweezers 211 to accurately control the pipe threading length of the fine thermocouple wire, and the centering module 2111 of the pipe threading electromagnetic tweezers 211 can align the fine thermocouple wire with the inlet center of the U-shaped quartz tube. The device is easy to operate and does not waste materials.

[0107] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An automatic welding and pipe threading device for fine thermocouple wires, characterized in that: include: A loading and unloading mechanism (1), a pipe threading mechanism (2), a rotary wire feeding mechanism (3), a shearing mechanism (4) and a spot welding machine; The loading and unloading mechanism (1) comprises a roller (11), and a plurality of placement grooves (111) are evenly distributed in the circumferential direction of the roller (11), and the placement grooves (111) are used to place U-shaped quartz tubes; The tube-threading mechanism (2) is located upstream of the loading and unloading mechanism (1), and the tube-threading mechanism (2) comprises a linear travel unit (21) and a U-shaped platform (23). The linear travel unit (21) comprises a tube-threading electromagnetic tweezers (211), and the tube-threading electromagnetic tweezers (211) are used to clamp the fine thermocouple wire and thread it into the U-shaped quartz tube. The tube-threading electromagnetic tweezers (211) are provided with a centering module (2111), and the U-shaped platform (23) is provided with a lifting structure (233). The centering module (2111) uses the lifting structure (233) to align the fine thermocouple wire with the inlet center of the U-shaped quartz tube. The rotary wire feeding mechanism (3) is located upstream of the tube threading mechanism (2), and the rotary wire feeding mechanism (3) comprises two wire feeding modules (31), and the two wire feeding modules (31) form an angle of no more than 90 degrees; The tube-penetrating electromagnetic tweezers (211) comprise two tweezers (2112) and a tube-penetrating electromagnet (2113), the top ends of the two tweezers (2112) are fitted and fixed, one of the tweezers (2112) is fixed with the tube-penetrating electromagnet (2113), the centering module (2111) comprises two fine shafts (21111) and the ends of each of the tweezers (2112) are provided with symmetrically arranged strip holes (21121), the two strip holes (21121) are symmetrically arranged, and the two strip holes (21121) are symmetrically arranged. The end close to each other is narrower than the end far away from the two strip holes (21121); the two ends of each fine shaft (21111) are thicker than the middle; the two fine shafts (21111) are respectively inserted into the two symmetrically arranged strip holes (21121), and each fine shaft (21111) spans the opposite strip holes (21121) of the two tweezers (2112); the lifting structure (233) is used to control the lifting of the lower fine shaft (21111); The opening of the U-shaped platform (23) faces the rotating wire feeding mechanism (3); a groove track (231) is provided on the top of the U-shaped platform (23); the groove track (231) gradually narrows in the direction of the rotating wire feeding mechanism (3); the ends of the two tweezers (2112) of the tube-threading electromagnetic tweezers (211) can slide along the inner side of the groove track (231) so that the opening at the ends between the two tweezers (2112) becomes larger or smaller; The lifting structure (233) comprises two lifting rails arranged inside the groove rail (231), the lifting rails extending towards the direction of the rotating wire feeding mechanism (3) and gradually rising, and the two ends of the lower fine shaft (21111) are respectively slidably connected to the two lifting rails; or, The lifting structure (233) comprises a top surface of the U-shaped platform (23) that gradually rises in the direction of the rotating wire feeding mechanism (3), and two ends of the lower fine shaft (21111) are placed on the top surface of the U-shaped platform (23).

2. The automatic welding and pipe threading device for fine thermocouple wires according to claim 1 is characterized in that: A U-shaped platform forward conduit (232) is also provided on the top of the U-shaped platform (23); the U-shaped platform forward conduit (232) is located between the tube-threading electromagnetic tweezers (211) and the rotary wire feeding mechanism (3); and the axis of the U-shaped platform forward conduit (232) is colinear with the axis of the U-shaped quartz tube inlet.

3. The automatic welding and pipe threading device for fine thermocouple wires according to claim 2 is characterized in that: The linear travel unit (21) further comprises a linear travel guide rail (212) and a linear travel slider (213); the linear travel slider (213) is slidably connected to the linear travel guide rail (212); and the top end of the tube-penetrating electromagnetic tweezers (211) is fixed to the linear travel slider (213).

4. The automatic welding and pipe threading device for fine thermocouple wires according to claim 3 is characterized in that: The loading and unloading mechanism (1) further comprises a protective cover (12), a loading bin (13), a unloading bin (14), a spare unloading bin (15), an loading and unloading motor (16), and an loading and unloading motor fixing frame (17); the protective cover (12) covers the outside of the roller (11) and there is a gap between the protective cover (12) and the roller (11); the protective cover (12) is respectively connected to the loading bin (13), the unloading bin (14) and the spare unloading bin (15); the loading and unloading motor (16) is fixed on the loading and unloading motor fixing frame (17); and the main shaft of the loading and unloading motor (16) is connected to the axis of the roller (11).

5. The automatic welding and pipe threading device for fine thermocouple wires according to claim 4 is characterized in that: The rotary wire feeding mechanism (3) further comprises a rotary motor (32), a rotary motor fixing frame (33), and a cylindrical rotating table (34); the rotary motor (32) is fixed to the rotary motor fixing frame (33); the main shaft of the rotary motor (32) is connected to the axis of the cylindrical rotating table (34); the thickness of the cylindrical rotating table (34) on a side close to the U-shaped table (23) is lower than the thickness of the cylindrical rotating table (34) on a side away from the U-shaped table (23); the side of the cylindrical rotating table (34) close to the U-shaped table (23) is embedded in the opening of the U-shaped table (23) with a gap; and the cylindrical rotating table (34) is connected to the two wire feeding modules (31).

6. The automatic welding and pipe threading device for fine thermocouple wires according to claim 5, characterized in that: The wire feeding module (31) comprises a crossbeam (311), a wire roller shaft (312), a tray (313), a straightener (314), a tensioning guide roller (315) and a micro-motion compensator (316); two ends of the crossbeam (311) are respectively connected to the cylindrical rotating table (34) and the wire roller shaft (312); the tray (313) is fixedly connected to the wire roller shaft (312); the straightener (314) and the tensioning guide roller (315) are both fixed to the crossbeam (311); the micro-motion compensator (316) is fixed to the cylindrical rotating table (34); the fine thermocouple wire extends from a fine thermocouple wire coil rotatably connected to the wire roller shaft (312) and passes through the straightener (314), the tensioning guide roller (315) and the micro-motion compensator in sequence.

7. The automatic welding and pipe threading device for fine thermocouple wires according to claim 6, characterized in that: The micro-motion compensator (316) comprises a fixing frame (3161), micro-motion compensation electromagnetic tweezers (3162), a reset spring (3163), a micro-motion compensation electromagnet (3164) and an adjusting screw (3165); the fixing frame (3161) comprises a vertical fixing plate (31611) and an L-shaped fixing plate (31612) arranged side by side; the fixing frame (3161) further comprises four horizontal guide rods (31613); the bottom plate of the L-shaped fixing plate (31612) is fixed on the cylindrical rotating table (34); the two ends of each of the horizontal guide rods (31613) are respectively connected to the vertical plates of the vertical fixing plate (31611) and the L-shaped fixing plate (31612); The four horizontal guide rods (31613) are arranged in a square shape, the micro-motion compensation electromagnetic tweezers (3162) are slidably connected to the horizontal guide rods (31613), there is at least one reset spring (3163), and the two ends of each reset spring (3163) are respectively connected to the micro-motion compensation electromagnetic tweezers (3162) and the vertical plate of the L-shaped fixed plate (31612), the micro-motion compensation electromagnet (3164) is fixed on the vertical fixed plate (31611), and the adjusting screw (3165) is rotatably connected to the vertical plate of the L-shaped fixed plate (31612) to control the stroke of the micro-motion compensation electromagnetic tweezers (3162) to the vertical fixed plate (31611).

8. A method for using an automatic welding and pipe threading device for a fine thermocouple wire, using the automatic welding and pipe threading device for a fine thermocouple wire as claimed in claim 7, characterized in that: The following steps are involved: Step 1: Turn on the power switch, set parameters, place two types of fine thermocouple wire coils on the two wire roller shafts (312), respectively, set the fine thermocouple wire extended from the wire feeding module (31) and the U-shaped platform forward guide tube (232) to be in the same straight line as the working position, and reset the loading and unloading mechanism (1), the pipe threading mechanism (2) and the shearing mechanism (4) to the initial position, wherein the parameters include: The total length of the U-shaped quartz tube is L. After cutting, the length of the fine thermocouple wire at the end of the U-shaped quartz tube is T. The distance L1 from the shearing point of the scissors (41) located between the roller (11) and the tube-piercing electromagnetic tweezers (211) to the end of the tube-piercing electromagnetic tweezers (211) is The distance L2 from the end of the U-shaped quartz tube extending out of the fine thermocouple wire to the shearing point of the scissors (41) located between the roller (11) and the tube-piercing electromagnetic tweezers (211) is The reciprocating step length S of the linear moving slider (213) is When the scissors (41) located between the roller (11) and the tube-threading electromagnetic tweezers (211) are started, the linear moving slider (213) reciprocates a number of times m according to the step length S. The linear moving slider (213) reciprocates a number of times n according to the step length S. The angle α between the two wire feeding modules (31) is The feed distance of the even-wire micro-motion compensator (316) is 2δ; Step 2: The rotating motor (32) is started so that one of the wire feeding modules (31) is located at the working position, and a fine thermocouple wire is pulled out from the fine thermocouple wire coil of the wire feeding module (31) located at the working position and sequentially passes through the tensioning guide roller (315), the straightener (314), the micro-motion compensator, the U-shaped table forward guide tube (232), the end of the tube-penetrating electromagnetic tweezers (211) and passes over a first fixed length L1 at the end of the tube-penetrating electromagnetic tweezers (211); Step 3: another type of the fine thermocouple wire is pulled out from the fine thermocouple wire coil that is not located at the working position and sequentially passes through the tensioning guide roller (315), the straightener (314), and the micro-motion compensator of the wire feeding module (31) that is not located at the working position, and passes over the second fixed length of the fine thermocouple wire located at the working position, and the two types of the fine thermocouple wires are overlapped; Step 4: the spot welding machine is started, and the spot welding machine performs welding, and the overlapping point of the two fine thermocouple wires is the welding point; Step 5: The rotating motor (32) is started, driving the cylindrical rotating platform (34) to rotate the angle, so that the wire feeding module (31) not located at the working position is rotated to the working position, the tube-penetrating electromagnet (2113) is energized, and the tube-penetrating electromagnetic tweezers (211) clamp the welded fine thermocouple wire; Step 6: The scissors (41) between the U-shaped platform forward guide tube (232) and the micro-motion compensator (316) are activated to cut the fine thermocouple wire that is not located at the working position and leave a third fixed length to the welding point; Step 7: The linear moving unit (21) is started, the linear moving slider (213) moves forward, driving the tube-penetrating electromagnetic tweezers (211) to deliver the welded fine thermocouple wire into the empty U-shaped quartz tube, the tube-penetrating electromagnetic iron (2113) loses power, the tube-penetrating electromagnetic tweezers (211) releases the fine thermocouple wire, the linear moving slider (213) moves in the opposite direction to the set point, the tube-penetrating electromagnetic iron (2113) is energized, the linear moving slider (213) reciprocates at a fixed step length S, the tube-penetrating electromagnetic iron (2113) loses power when it moves to the U-shaped quartz tube, and is energized when it moves to the set point, the linear moving slider (213) moves back and forth at a fixed step length S, the tube-penetrating electromagnetic iron (2113) loses power when it moves to the U-shaped quartz tube, and is energized when it moves to the set point, the linear moving slider (213) moves back and forth at a fixed step length S, 213) After reciprocating m times according to the step length S, the scissors (41) located between the roller (11) and the tube-threading electromagnetic tweezers (211) are started to cut the fine thermocouple wire located at the working position and leave a fourth fixed length L2. After the linear moving slider (213) reciprocates n times according to the step length S, the remaining length M of the fine thermocouple wire to be threaded is M, wherein m is less than n, and M is less than S. m is obtained by the following formula: L+2T-L1=mS+L2, and n is obtained by the following formula: L+2T-L1=nS+M, wherein L is the total length of the U-shaped quartz tube threaded, and T is the length of the fine thermocouple wire extending from the end of the U-shaped quartz tube after cutting; Step 8: After the pipe threading is completed, the linear moving slider (213) moves in the opposite direction to the initial position, and the end of the fine thermocouple wire cut at the working position is threaded into the centering module (2111) of the pipe threading electromagnetic tweezers (211), and the length beyond the end of the pipe threading electromagnetic tweezers (211) is L1; Step 9: The loading and unloading motor (16) is started, and the roller (11) rotates, so that the U-shaped quartz tube equipped with the fine thermocouple wire enters the unloading bin (14), and the axis line of the inlet of the next empty U-shaped quartz tube is in line with the axis line of the forward guide tube (232) of the U-shaped platform; Step 10: the micro-motion compensator (316) not located at the working position is started, and the micro-motion compensating electromagnetic tweezers (3162) drive the fine thermocouple wire not located at the working position to pass over the second fixed length of the fine thermocouple wire located at the working position; Step 11: Repeat steps 4 to 10 until all product processing is completed.

Images