An automatic thermocouple cabling process

Abstract

The application relates to a thermocouple automatic casing process method and belongs to the field of high-temperature-resistant thermocouples. The method comprises the following steps: S1, feeding and straightening a thermocouple wire and cutting the thermocouple wire into a fixed length; S2, feeding single-hole ceramic tubes and displacing a plurality of the single-hole ceramic tubes to a perforating station; S3, threading the thermocouple wire in step S1 through the plurality of single-hole ceramic tubes in step S2 to form a single-group casing thermocouple wire; S4, repeating steps S1-S3 to form two groups of casing thermocouple wires; S5, feeding double-hole ceramic tubes and adjusting the postures of the double-hole ceramic tubes; S6, threading the two groups of casing thermocouple wires in step S4 through the double-hole ceramic tubes in step S5; and S7, welding the two groups of casing thermocouple wires in step S6 close to one end of the double-hole ceramic tubes to complete thermocouple casing. The application is favorable for realizing automatic and efficient operation of thermocouple wire casing and ensuring the consistency of thermocouple processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-temperature-resistant thermocouples, in particular to a thermocouple automatic sheathing process method. BACKGROUND

[0002] In the high-temperature durability test process, the temperature needs to be measured in a high-temperature environment, and the temperature resistance of the thermocouple is extremely high. The existing technology generally sheaths a ceramic tube on the surface of the thermocouple wire, and realizes it through the technical principle of ceramic heat insulation. The existing production method is mainly manual sheathing, which has low work efficiency and poor consistency of the produced thermocouples. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a thermocouple automatic sheathing process method, which realizes efficient sheathing operation and ensures the consistency of the thermocouple.

[0004] The technical scheme for solving the above technical problem is as follows: a thermocouple automatic sheathing process method, comprising the following steps:

[0005] S1: cutting the thermocouple wire into a fixed length after feeding and straightening the thermocouple wire;

[0006] S2: feeding a single-hole ceramic tube, and displacing a plurality of single-hole ceramic tubes to a perforation station;

[0007] S3: passing the thermocouple wire in step S1 through the plurality of single-hole ceramic tubes in step S2 to form a single-group sheathed thermocouple wire;

[0008] S4: repeating steps S1-S3 to form two groups of sheathed thermocouple wires;

[0009] S5: feeding a double-hole ceramic tube and adjusting the posture of the double-hole ceramic tube;

[0010] S6: passing the two groups of sheathed thermocouple wires in step S4 through the double-hole ceramic tube in step S5;

[0011] S7: welding the two groups of sheathed thermocouple wires in step S6 close to one end of the double-hole ceramic tube to complete the thermocouple sheathing.

[0012] The beneficial effects of the present application are: by automatically sheathing the thermocouple wire with a single-hole ceramic tube and a double-hole ceramic tube in sequence, and welding the two thermocouple wires after sheathing the double-hole ceramic tube, the sheathing efficiency is higher compared with the manual sheathing method in the prior art, and the consistency of the thermocouple produced by the automatic method is higher.

[0013] On the basis of the above technical scheme, the present application can also be improved as follows.

[0014] Further, the step S1 comprises:

[0015] S11: feeding the thermocouple wire by a feeding device or manually;

[0016] S12: straightening the thermocouple wire by a straightening device;

[0017] S13: displacing the straightened thermocouple wire to a preset length by a servo device;

[0018] S14: cutting the thermocouple wire in step S13 by a cutting device.

[0019] The above further scheme has the beneficial effect that the feeding, straightening and cutting of the thermocouple wire are realized by the feeding device, the straightening device, the servo device and the cutting device, which is conducive to improving the automation level of the sleeve preparation stage.

[0020] Further, the step S2 comprises:

[0021] S21: outputting a plurality of single-hole ceramic tubes in a preset direction by a vibrating disc;

[0022] S22: carrying a preset number of single-hole ceramic tubes to the perforating station by a carrying device.

[0023] The above further scheme has the beneficial effect that the vibrating disc is conducive to arranging and outputting the disordered single-hole ceramic tubes in the preset direction, and the carrying device is conducive to carrying the single-hole ceramic tubes to be sleeved with the thermocouple wire to the perforating station to realize sleeve, replacing the manual perforating operation and improving the automation degree.

[0024] Further, the step S3 comprises:

[0025] S31: pressing a plurality of single-hole ceramic tubes on the perforating station by a profiling device to coaxially arrange the single-hole ceramic tubes;

[0026] S32: displacing the cut thermocouple wire to pass through the coaxially arranged single-hole ceramic tubes by a servo device to form a single-group sleeve thermocouple wire.

[0027] The above further scheme has the beneficial effect that the profiling device is conducive to pressing and coaxially arranging the single-hole ceramic tubes on the perforating station, and the servo device is conducive to driving the thermocouple wire to displace on the perforating station and pass through the single-hole ceramic tubes, replacing the manual operation and improving the automation degree.

[0028] Further, the step S5 comprises:

[0029] S51: outputting a plurality of the double-hole ceramic tubes in a preset direction by a vibrating disc to the double-hole ceramic management material;

[0030] S52: carrying one of the double-hole ceramic tubes to the range of a visual recognition device by a carrying device;

[0031] S53: photographing and recognizing the hole positions of the double-hole ceramic tube by the visual recognition device;

[0032] S54: adjusting the two hole positions of the double-hole ceramic tube to correspond to two groups of sleeve thermocouple wires by a servo rotating device.

[0033] The beneficial effect of the above further scheme is that the vibrating disc is conducive to arranging and outputting the multiple double-hole ceramic tubes in a preset direction, the carrying device cooperates with the visual recognition device to facilitate photographing and recognizing the posture of the double-hole ceramic tube, and the servo rotating device is conducive to adjusting the double-hole posture of the double-hole ceramic tube to correspond to the two groups of sleeve thermocouple wires, facilitating the subsequent step of the two groups of sleeve thermocouple wires passing through the double-hole ceramic tube, replacing manual feeding and recognition operation, and improving the degree of automation.

[0034] Further, step S6 comprises:

[0035] S61: displacing the distance between the two groups of sleeve thermocouple wires to correspond to the distance between the two hole positions of the double-hole ceramic tube by a servo device;

[0036] S62: displacing the two groups of sleeve thermocouple wires to pass through the two hole positions of the double-hole ceramic tube by the servo device.

[0037] The beneficial effect of the above further scheme is that the servo device is conducive to driving the displacement of the two groups of sleeve thermocouple wires and passing through the double-hole ceramic tube, replacing manual punching operation, and improving the degree of automation.

[0038] Further, step S7 comprises:

[0039] S71: carrying the two groups of sleeve thermocouple wires after passing through the double-hole ceramic tube in step S62 to a welding station by a carrying device;

[0040] S72: clamping and fixing one end of the two groups of sleeve thermocouple wires in step S71 close to the double-hole ceramic tube by a clamping device;

[0041] S73: cutting the clamped and fixed end of the two groups of sleeve thermocouple wires in step S72 by a cutting device;

[0042] S74: welding the cut end of the two groups of sleeve thermocouple wires in step S73 by a butt welding device.

[0043] The beneficial effects of the above further scheme are that the carrying device is beneficial to replace manual carrying, and the clamping device, the cutting device and the butt welding device are beneficial to fixing, cutting and welding the end portions of the two groups of sleeve pipe thermocouple wires, thereby replacing manual operation and improving the automation degree. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A process flow chart is provided for the embodiment of the present application.

[0045] Figure 2 A schematic diagram of two groups of sleeve pipe thermocouple wires is provided for the embodiment of the present application.

[0046] Figure 3 A schematic diagram of two groups of sleeve pipe thermocouple wires after passing through a double-hole ceramic tube is provided for the embodiment of the present application.

[0047] Figure 4 A schematic diagram of a completed thermocouple sleeve pipe is provided for the embodiment of the present application.

[0048] In the above description, Figure 4 the black circles represent welding points.

[0049] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0050] 1, thermocouple wire; 2, single-hole ceramic tube; 3, double-hole ceramic tube. DETAILED DESCRIPTION

[0051] The principles and features of the present application are described below, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0052] As shown in Figures 1 to 4 , an automatic sleeve pipe process method for thermocouples includes the following steps:

[0053] S1: cutting the thermocouple wire 1 into a fixed length after feeding and straightening the thermocouple wire 1;

[0054] S2: feeding the single-hole ceramic tube 2, and displacing a plurality of the single-hole ceramic tubes 2 to a perforating station;

[0055] S3: passing the thermocouple wire 1 in step S1 through the plurality of single-hole ceramic tubes 2 in step S2 to form a single group of sleeve pipe thermocouple wires;

[0056] S4: repeating steps S1-S3 to form two groups of sleeve pipe thermocouple wires;

[0057] S5: feeding the double-hole ceramic tube 3, and adjusting the posture of the double-hole ceramic tube 3;

[0058] S6: passing the two groups of sleeve pipe thermocouple wires in step S4 through the double-hole ceramic tube 3 in step S5;

[0059] S7: welding two sets of sleeve sheathed thermocouple wires in step S6 close to one end of the double-hole ceramic tube 3, completing the thermocouple sleeve.

[0060] The beneficial effects of the present application are: through the automatic way of sheathing the thermocouple wires in the single-hole ceramic tube and the double-hole ceramic tube in turn, and welding the two thermocouple wires after sheathing the double-hole ceramic tube, compared with the manual sleeve method in the prior art, the sleeve efficiency is high, and the consistency of the thermocouple made by the automatic way is higher.

[0061] Preferably, step S1 comprises:

[0062] S11: feeding the thermocouple wire 1 through a unwinding device or manually;

[0063] S12: straightening the thermocouple wire 1 through a straightening device;

[0064] S13: displacing the straightened thermocouple wire 1 to a preset length through a servo device;

[0065] S14: cutting the thermocouple wire 1 in step S13 through a cutting device.

[0066] The beneficial effects of the above preferred scheme are: the feeding, straightening and cutting of the thermocouple wire are realized through the unwinding device, the straightening device, the servo device and the cutting device, which is conducive to improving the automation level of the preparation stage before sleeving.

[0067] Preferably, step S2 comprises:

[0068] S21: arranging the single-hole ceramic tube 2 through a vibrating disc, so that multiple single-hole ceramic tubes 2 are output along a preset direction;

[0069] S22: carrying a preset number of single-hole ceramic tubes 2 to the perforation station through a carrying device.

[0070] The beneficial effects of the above preferred scheme are: the vibrating disc is conducive to arranging and outputting the multiple single-hole ceramic tubes in a preset direction, and the carrying device is conducive to carrying the multiple single-hole ceramic tubes to be sleeved on the thermocouple wire to the perforation station to realize sleeving, replacing manual operation and improving the automation degree.

[0071] Preferably, as shown in Figure 2 Step S3 comprises:

[0072] S31: pressing multiple single-hole ceramic tubes 2 on the perforation station through a profiling device, so that multiple single-hole ceramic tubes 2 are coaxially arranged;

[0073] S32: Displace the cut hot-wire 1 to pass through the multiple coaxially arranged single-hole ceramic tubes 2 by a servo device, to form a single set of sleeve tube hot-wire.

[0074] The above preferred scheme has the beneficial effect that the profiling equipment is conducive to compacting and coaxially placing multiple single-hole ceramic tubes on the perforation station, and the servo device is conducive to driving the hot-wire to displace on the perforation station and pass through the multiple single-hole ceramic tubes, replacing manual perforation operation and improving the degree of automation.

[0075] Preferably, step S5 includes:

[0076] S51: Arrange the multiple double-hole ceramic tubes 3 by a vibrating disc to output along a preset direction;

[0077] S52: Carry one double-hole ceramic tube 3 to the range of a visual recognition device by a carrying device;

[0078] S53: Photograph and recognize the hole positions of the double-hole ceramic tube 3 by the visual recognition device;

[0079] S54: Adjust the two hole positions of the double-hole ceramic tube 3 to correspond to the two sets of sleeve tube hot-wires by a servo rotating device.

[0080] The above preferred scheme has the beneficial effect that the vibrating disc is conducive to arranging and outputting multiple double-hole ceramic tubes in a preset direction, the carrying device cooperates with the visual recognition device to be conducive to photographing and recognizing the posture of the double-hole ceramic tube, and the servo rotating device is conducive to adjusting the posture of the double-hole ceramic tube to correspond to the two sets of sleeve tube hot-wires, which facilitates the two sets of sleeve tube hot-wires to pass through the double-hole ceramic tube in the subsequent step, replaces manual loading and recognition operation, and improves the degree of automation.

[0081] Preferably, as shown in Figure 3 , step S6 includes:

[0082] S61: Displace the distance between the two sets of sleeve tube hot-wires to correspond to the distance between the two hole positions of the double-hole ceramic tube 3 by a servo device;

[0083] S62: Displace the two sets of sleeve tube hot-wires to pass through the two hole positions of the double-hole ceramic tube 3 by a servo device.

[0084] The above preferred scheme has the beneficial effect that the servo device is conducive to driving the two sets of sleeve tube hot-wires to displace and pass through the double-hole ceramic tube, replacing manual perforation operation and improving the degree of automation.

[0085] Preferably, as shown in Figure 4 , step S7 includes:

[0086] S71: The two groups of sheathed thermocouple wires after passing through the double-hole ceramic tube 3 in step S62 are transported to a welding station by a transporting device;

[0087] S72: The two groups of sheathed thermocouple wires in step S71 are clamped and fixed near one end of the double-hole ceramic tube 3 by a clamping device;

[0088] S73: The clamped and fixed end of the two groups of sheathed thermocouple wires in step S72 is cut by a cutting device;

[0089] S74: The cut end of the two groups of sheathed thermocouple wires in step S73 is welded by a butt welding device.

[0090] The beneficial effects of the above preferred scheme are that the transporting device is beneficial to replace manual transportation, and the clamping device, the cutting device, and the butt welding device are beneficial to fix, cut, and weld the ends of the two groups of sheathed thermocouple wires, replacing manual operation and improving the degree of automation.

[0091] It should be noted that in the technical scheme of the present application, the unwinding device, the straightening device, the servo device, the cutting device, the vibrating disc, the transporting device, the profiling device, the visual recognition device, the servo rotating device, the clamping device, and the butt welding device are all prior art, and therefore their specific structures are not described.

[0092] The present application will be described below through two embodiments:

[0093] Embodiment One.

[0094] (1) Coil feeding: The thermocouple wire is fed through a coil, installed on an unwinding machine, which provides resistance to maintain the consistency of the thermocouple tension;

[0095] (2) Straightening and cutting: After the thermocouple wire is straightened by a straightener, it is moved to a set length by a servo device, and then cut by a cutting device;

[0096] (3) Vibrating disc feeding (single-hole): The single-hole ceramic tube is fed by a vibrating disc, which outputs multiple single-hole ceramic tubes in a specified direction;

[0097] (4) Arrangement and combination: The multiple single-hole ceramic tubes fed by the vibrating disc are arranged and combined in a certain direction to form a line, and then transported to a punching station by a transporting device;

[0098] (5) Single-hole ceramic tube punching: The single-hole ceramic tube is pressed tightly by a profiling device, which is generally in the form of two semicircles to achieve concentricity, and then the straightened thermocouple wire is passed through the multiple single-hole ceramic tubes by a servo device;

[0099] (6) Vibration disc feeding (double hole) : double hole ceramic tube is fed by vibration disc, and the double hole ceramic tube is output in a specified direction;

[0100] (7) CCD posture adjustment: the double hole ceramic tube is carried to the CCD camera range by the carrying device, the posture of the double hole is recognized by the CCD camera, and the posture of the double hole ceramic tube is adjusted by the servo rotating device;

[0101] (8) Double hole ceramic tube threading: two thermocouple wires sleeved with single hole ceramic tubes are placed side by side, the end part of the thermocouple wire is limited to be consistent with the double hole spacing by the end part feeding device, the double hole ceramic tube is driven by the servo device to pass through the two thermocouple wires, and the double hole ceramic tube threading is realized;

[0102] (9) Welding: the thermocouple wire is carried to the welding station by the carrying device, the end part of the thermocouple wire is combined by the clamping device, the end part consistency is ensured by the cutting device, and then the welding head of the butt welding machine contacts the end part of the thermocouple wire to realize welding;

[0103] (10) Discharging: the thermocouple wire is carried to the discharging port by the carrying device, and automatic sleeving is completed.

[0104] Example two.

[0105] (1) Manual thermocouple threading: the cut thermocouple wire is manually threaded through the perforator;

[0106] (2) Straightening: the thermocouple wire is straightened by the straightener, and then is moved to the measuring station by the servo device;

[0107] (3) Length inspection: the length of the thermocouple wire is converted by the displacement length of the servo device through photoelectric sensor sensing, and the thermocouple wire is discharged from the unqualified port when the length is unqualified;

[0108] (4) Vibration disc feeding (single hole) : single hole ceramic tube is fed by vibration disc, and multiple single hole ceramic tubes are output in a specified direction;

[0109] (5) Arrangement and combination: multiple single hole ceramic tubes conveyed by the vibration disc are arranged and combined in a certain direction, and are carried to the perforation station by the carrying device;

[0110] (6) Single hole ceramic tube threading: the single hole ceramic tube is pressed by the profiling device, the profiling device is generally provided in the form of two semicircles to realize single hole ceramic tube concentricity, and then the straightened thermocouple wire is threaded through the multiple single hole ceramic tubes by the servo device;

[0111] (7) Vibration disc feeding (double hole) : double hole ceramic tube is fed by vibration disc, and the double hole ceramic tube is output in a specified direction;

[0112] (8) CCD posture adjustment: the conveying device carries the double-hole ceramic tube into the range of the CCD camera, the posture of the double-hole ceramic tube is recognized by the CCD camera, and the posture of the double-hole ceramic tube is adjusted by the servo rotating device;

[0113] (9) Double-hole ceramic tube threading: two thermocouple wires sleeved with single-hole ceramic tubes are placed side by side, and the end part of the thermocouple wire is limited to be consistent with the double-hole spacing by the end part arrangement device, the servo device drives the double-hole ceramic tube to pass through the two thermocouple wires, and the double-hole ceramic tube threading is realized;

[0114] (10) Welding: the conveying device carries the thermocouple wire to the welding station, the clamping device combines the end part of the thermocouple wire, the cutting device cuts to ensure the consistency of the end part, and then the welding head of the butt welding machine contacts the end part of the thermocouple wire to realize welding;

[0115] (11) Discharging: the conveying device carries the thermocouple wire to the discharging port to complete automatic sleeving.

[0116] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0117] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0118] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0119] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0120] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0121] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A thermocouple automatic sheathing process method, characterized by, It comprises the following steps: S1: cutting the thermocouple wire (1) into a fixed length after feeding and straightening; S2: feeding the single-hole ceramic tube (2) and displacing multiple single-hole ceramic tubes (2) to the perforation station; S3: passing the thermocouple wire (1) in step S1 through multiple single-hole ceramic tubes (2) in step S2 to form a single set of sleeved thermocouple wire; S4: repeating steps S1-S3 to form two sets of sleeved thermocouple wire; S5: feeding the double-hole ceramic tube (3) and adjusting the posture of the double-hole ceramic tube (3); S6: passing the two sets of sleeved thermocouple wire in step S4 through the double-hole ceramic tube (3) in step S5; S7: welding the two sets of sleeved thermocouple wire in step S6 close to one end of the double-hole ceramic tube (3) to complete the thermocouple sleeve.

2. The process of automatically sheathing thermocouples as defined in claim 1, wherein, Step S1 comprises: S11: feeding the thermocouple wire (1) by unwinding equipment or manually; S12: straightening the thermocouple wire (1) by straightening equipment; S13: displacing the straightened thermocouple wire (1) to a preset length by servo equipment; S14: cutting the thermocouple wire (1) in step S13 by cutting equipment.

3. The process of automatically sheathing thermocouples as defined in claim 1, wherein, Step S2 comprises: S21: sorting the single-hole ceramic tube (2) by a vibrating disc to make multiple single-hole ceramic tubes (2) output in a preset direction; S22: carrying a preset number of single-hole ceramic tubes (2) to the perforation station by carrying equipment.

4. The process of automatically sheathing thermocouples as defined in claim 1, wherein, Step S3 comprises: S31: compacting multiple single-hole ceramic tubes (2) on the perforation station by profiling equipment to make multiple single-hole ceramic tubes (2) coaxially arranged; S32: displacing the cut thermocouple wire (1) to pass through multiple coaxially arranged single-hole ceramic tubes (2) by servo equipment to form a single set of sleeved thermocouple wire.

5. The automatic thermocouple sleeving process method according to claim 1, wherein Step S5 comprises: S51: sorting the double-hole ceramic tube (3) by a vibrating disc to make multiple double-hole ceramic tubes (3) output in a preset direction; S52: carrying one double-hole ceramic tube (3) to the range of visual recognition equipment by carrying equipment; S53: taking a photo of the hole position of the double-hole ceramic tube (3) by the visual recognition equipment; S54: adjusting the two hole positions of the double-hole ceramic tube (3) to correspond to the two sets of sleeved thermocouple wire by servo rotating equipment.

6. The process of automatically sheathing thermocouples as defined in claim 1, wherein, Step S6 comprises: S61: displacing the distance between the two sets of sleeved thermocouple wire to correspond to the distance between the two hole positions of the double-hole ceramic tube (3) by servo equipment; S62: displacing the two sets of sleeved thermocouple wire to pass through the two hole positions of the double-hole ceramic tube (3) by servo equipment.

7. The process of automatically cabling a thermocouple of claim 6 wherein, Step S7 comprises: S71: carrying the two sets of sleeved thermocouple wire after passing through the double-hole ceramic tube (3) in step S62 to the welding station by carrying equipment; S72: clamping and fixing the two sets of sleeved thermocouple wire in step S71 close to one end of the double-hole ceramic tube (3) by clamping equipment; S73: cutting the one end of the two sets of sheathed thermocouple wires clamped and fixed in step S72 by a cutting device; S74: welding the cut one end of the two sets of sheathed thermocouple wires in step S73 by a butt welding device.

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