Armored thermocouple assembly process

Abstract

The invention relates to the technical field of thermocouples, and discloses a sheathed thermocouple assembly process, which comprises the steps of S1, thermocouple wire pretreatment, S2, thermocouple wire through-tube filling, S3, drawing and hole shrinkage, S4, end part sealing, S5, bending and forming, and S6, performance testing. The sleeve filling auxiliary equipment in the second step comprises a supporting base, a motor is fixedly arranged at the upper end of the supporting base, a winding shaft is in power connection with the lower end of the motor, a winding wheel is fixedly connected to the winding shaft, an air pump is fixedly arranged at the lower end of the winding wheel, one end of a pipeline penetrates through and is fixedly connected to the winding wheel, and a sliding plate is fixedly connected to the tail of the other end of the pipeline through a mounting ring. A plurality of clamping holes are formed in the sliding plate in a penetrating mode, the connecting ring is rotationally connected to the upper end of the supporting base, and a plurality of fixing mechanisms are arranged at the upper end of the supporting base and used for fixing a sleeve.

Description

Technical Field

[0001] The present application relates to the technical field of thermocouples, and in particular to an assembly process of armored thermocouples. Background Art

[0002] Armored thermocouples are temperature measurement sensors with many advantages such as flexibility, high pressure resistance, fast thermal response time, and durability. The assembly of armored thermocouples is to anneal the thermocouple wire, insert it into the tube, and then draw it to reduce the diameter, seal the end, and bend and form it. The above construction process needs to fill dense magnesium oxide during pipe filling to ensure that there are no gaps. Therefore, an armored thermocouple assembly process is proposed to solve the above problem. Summary of the Invention

[0003] In order to solve the above-mentioned problems, the present application provides an armored thermocouple assembly process.

[0004] The present application provides an armored thermocouple assembly process that adopts the following technical solutions: An armored thermocouple assembly process includes the following steps: S1. Thermocouple wire pretreatment Annealing the thermocouple wire: eliminating internal stress in the wire and improving stability; S2. Thermocouple wire tube filling Insert the thermocouple wire into the casing and vibrate to fill it with dense magnesium oxide to ensure that there are no gaps. Since the filling density of magnesium oxide affects the thermal conductivity and response speed, use casing filling auxiliary equipment to assist in the insertion and filling of the thermocouple wire to increase the magnesium oxide filling rate. S3.Drawing and reducing Through multiple drawing or rolling, the diameter of the sleeve into which the thermocouple wire is inserted is gradually reduced to form a compact structure. Annealing: eliminates processing stress and restores material ductility; S4. End seal Welding (argon arc welding, laser welding) at the measuring end forms a sealed node to protect the thermocouple wire, and epoxy resin, high temperature glue or metal cap is used to seal the non-measuring end to prevent magnesium oxide from absorbing moisture; S5. Bending and forming Bend into U-shape, spiral shape, etc. according to installation requirements, with a bending radius ≥ 5 times the casing diameter to avoid cracking; S6. Performance Test Perform insulation resistance testing, insulation continuity checks, and calibration verification; The casing loading auxiliary equipment in step 2 includes a support base 11, Casing filling auxiliary equipment also includes, The motor is fixed on the upper end of the support seat. The winding shaft is connected to the lower end of the motor. A winding wheel, fixedly connected to the winding shaft, The air pump is fixed at the lower end of the winding wheel. A pipe, one end of which passes through and is fixedly connected to the winding wheel, The sliding plate is fixedly connected to the other end of the pipe through a mounting ring. There are several card holes that penetrate through the sliding plate. The connecting ring is rotatably connected to the upper end of the support seat, The fixing mechanism is provided with a plurality of fixing mechanisms provided on the upper end of the support seat. Among them, the pipe is fixedly connected to a permeable membrane that only passes gas at one end away from the air pump, the pipe passes through one end of the winding wheel and is connected to the air pump, the middle part of the pipe is wound on the winding wheel, the number of the clamping holes is the same as the number of thermocouple wires that require sleeves, the size of the clamping holes is the same as the thermocouple wires that require sleeves, the side walls of the clamping holes are made of elastic material, and can clamp and fix the thermocouple wires, multiple fixing mechanisms are connected up and down, the lowermost fixing mechanism is connected to the support seat through the connecting ring, and the fixing mechanism is used to fix the sleeve.

[0005] Preferably, the casing filling auxiliary device further comprises: The side plate is provided with two fixedly connected to the lower end surface of the support seat, The rotating shaft is rotatably connected between the two side panels. A guide wheel, fixedly connected to the rotating shaft, Wherein, the pipeline passes by the guide wheel and turns to face the axis direction upward.

[0006] Preferably, the casing filling auxiliary device further comprises: A transmission shaft, powered by the motor, The transmission wheel is fixedly connected to the transmission shaft.

[0007] Preferably, the casing filling auxiliary device further comprises: Four supporting legs are fixedly connected to the lower end of the supporting base.

[0008] Preferably, the fixing mechanism includes: The rotating ring is provided on the upper side of the support seat. The support column is provided with two fixedly connected to the inner side wall of the rotating ring, The connecting pipe is provided with two connecting pipes which are respectively fixedly connected to the lower sides of the two supporting columns. The connecting rod is provided with two connecting rods which are respectively fixedly connected to the upper sides of the two supporting columns. Among them, the rotating ring is frictionally engaged with the transmission wheel, the axis of the rotating ring coincides with the axis of the sliding plate, the connecting tube can be inserted into the groove provided on the connecting ring to realize the fixed connection between the connecting tube and the connecting ring, the axis of the connecting rod coincides with the axis of the connecting tube, and a sliding groove is provided in the connecting tube that is slidably connected to the connecting rod, and is fixed by the sliding connection between the connecting tube and the connecting rod.

[0009] Preferably, the fixing mechanism further comprises: The inner ring is fixedly connected to the two support columns. Two sliding rods are provided and are respectively slidably connected to the inner ring side walls.

[0010] Preferably, the fixing mechanism further comprises: The movable plate is provided with two fixedly connected to the two sliding rods at one end away from each other, The motor is provided with two motors respectively fixed on the two movable plates. The threaded shaft is provided with two power connections to the two motors respectively, The fixed block is provided with two parts which are respectively rotatably connected to the two threaded shafts and close to one end face of each other. Among them, the sliding rods are close to each other at one end and pass through the inner ring and are fixedly connected to the fixing block. The threaded shaft is threadedly connected to the inner ring, and the fixing block is made of elastic material.

[0011] Preferably, the fixing mechanism further comprises: The pressure sensor is provided with two pressure sensors which are respectively fixed on the fixed block close to one end. The controller is provided with two fixed on the two movable plates respectively. The connecting line is provided with two connecting lines respectively connected to two groups of the controller and the pressure sensor close to each other, The movable plate is electrically connected to the motor and can control the start and stop of the motor, and the pressure sensor can monitor the pressure.

[0012] In summary, this application has the following beneficial technical effects: The invention relates to an armored thermocouple assembly process, in which magnesium oxide is densely filled when the thermocouple wire sleeve is filled by using a tube filling auxiliary device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the casing loading auxiliary device of the present invention; Figure 2 for Figure 1 Right view; Figure 3 for Figure 1 Top view; Figure 4 Schematic diagram of the structure of the rotating ring part of the casing filling auxiliary equipment of the present invention; Figure 5 for Figure 4 Top view.

[0014] Explanation of the accompanying drawings: 10. Support leg; 11. Support base; 13. Winding shaft; 14. Winding wheel; 15. Air pump; 17. Pipeline; 18. Side panel; 19. Rotating shaft; 20. Fixing mechanism; 21. Guide wheel; 22. Sliding plate; 23. Clamping hole; 24. Mounting ring; 25. Connecting ring; 26. Connecting pipe; 27. Support column; 28. Rotating ring; 29. ​​Connecting rod; 31. Inner ring; 33. Moving plate; 34. Controller; 35. Motor; 37. Threaded shaft; 38. Sliding rod; 39. Fixed block; 41. Pressure sensor; 42. Connecting line; 43. Drive shaft; 44. Drive wheel; 45. Motor. DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-5 This application is described in further detail.

[0016] The present application discloses an armored thermocouple assembly process.

[0017] An armored thermocouple assembly process includes the following steps: S1. Thermocouple wire pretreatment Annealing the thermocouple wire: eliminating internal stress in the wire and improving stability; S2. Thermocouple wire tube filling Insert the thermocouple wire into the casing and vibrate to fill it with dense magnesium oxide to ensure that there are no gaps. Since the filling density of magnesium oxide affects the thermal conductivity and response speed, use casing filling auxiliary equipment to assist in the insertion and filling of the thermocouple wire to increase the magnesium oxide filling rate. S3.Drawing and reducing Through multiple drawing or rolling, the diameter of the sleeve into which the thermocouple wire is inserted is gradually reduced to form a compact structure. Annealing: eliminates processing stress and restores material ductility; S4. End seal Welding (argon arc welding, laser welding) at the measuring end forms a sealed node to protect the thermocouple wire, and epoxy resin, high temperature glue or metal cap is used to seal the non-measuring end to prevent magnesium oxide from absorbing moisture; S5. Bending and forming Bend into U-shape, spiral shape, etc. according to installation requirements, with a bending radius ≥ 5 times the casing diameter to avoid cracking; S6. Performance Test Perform insulation resistance testing, insulation continuity checks, and calibration verification; Specifically, the casing loading auxiliary equipment in step 2 includes a support base 11, a motor 45 fixedly arranged at the upper end of the support base 11, a winding shaft 13 dynamically connected to the lower end of the motor 45, a winding wheel 14 fixedly connected to the winding shaft 13, an air pump 15 fixedly arranged at the lower end of the winding wheel 14, one end of a pipe 17 passes through and is fixedly connected to the winding wheel 14, a sliding plate 22 is fixedly connected to the tail of the other end of the pipe 17 through a mounting ring 24, a plurality of card holes 23 are provided through the sliding plate 22, a connecting ring 25 is rotatably connected to the upper end of the support base 11, and a plurality of fixing mechanisms 20 are provided at the upper end of the support base 11. Among them, the pipe 17 is fixedly connected to a permeable membrane that only passes gas at one end away from the air pump 15. The pipe 17 passes through one end of the winding wheel 14 and is connected to the air pump 15. The middle part of the pipe 17 is wound on the winding wheel 14. The number of the clamping holes 23 is the same as the number of thermocouple wires that require sleeves. The size of the clamping holes 23 is the same as the thermocouple wires that require sleeves. The side walls of the clamping holes 23 are made of elastic material and can clamp and fix the thermocouple wires. Multiple fixing mechanisms 20 are connected up and down, and the lowermost fixing mechanism 20 is connected to the support seat 11 through the connecting ring 25. The fixing mechanism 20 is used to fix the sleeve.

[0018] The casing loading auxiliary equipment also includes: a side plate 18 is provided with two fixed connections to the lower end surface of the support seat 11, a rotating shaft 19 is rotatably connected between the two side plates 18, and a guide wheel 21 is fixedly connected to the rotating shaft 19, wherein the pipe 17 bypasses the guide wheel 21 and changes direction to face upwards.

[0019] The casing filling auxiliary equipment also includes: a transmission shaft 43 is dynamically connected to the motor 45, and a transmission wheel 44 is fixedly connected to the transmission shaft 43, wherein the transmission wheel 44 is used to drive the fixing mechanism 20 to rotate, thereby driving the casing to rotate, so that the magnesium oxide is filled more fully when the magnesium oxide is filled into the casing.

[0020] The casing filling auxiliary equipment also includes: four support legs 10 fixedly connected to the lower end of the support base 11.

[0021] The fixing mechanism 20 includes a rotating ring 28 provided on the upper side of the support seat 11, a supporting column 27 provided with two fixedly connected to the inner side wall of the rotating ring 28, a connecting pipe 26 provided with two respectively fixedly connected to the lower sides of the two supporting columns 27, and a connecting rod 29 provided with two respectively fixedly connected to the upper sides of the two supporting columns 27, wherein the rotating ring 28 is frictionally engaged with the transmission wheel 44, the axis of the rotating ring 28 coincides with the axis of the sliding plate 22, the connecting pipe 26 can be inserted into the groove provided on the connecting ring 25 to realize the fixed connection between the connecting pipe 26 and the connecting ring 25, the axis of the connecting rod 29 coincides with the axis of the connecting pipe 26, and a sliding groove is provided in the connecting pipe 26 to be slidably connected to the connecting rod 29. The sliding connection and fixation of the connecting pipe 26 and the connecting rod 29 can realize the upper and lower connection and fixation of the two fixing mechanisms 20.

[0022] The fixing mechanism 20 further includes an inner ring 31 fixedly connected to the two support columns 27 , and a sliding rod 38 having two sliding rods 38 respectively connected to the side walls of the inner ring 31 .

[0023] The fixing mechanism 20 also includes: a movable plate 33 is provided with two fixed connections to the two sliding rods 38 at one end away from each other; a motor 35 is provided with two fixed connections to the two movable plates 33; a threaded shaft 37 is provided with two power connections to the two motors 35; a fixed block 39 is provided with two rotationally connected to the two threaded shafts 37 at one end face close to each other; wherein, one end of the sliding rod 38 close to each other passes through the inner ring 31 and is fixedly connected to the fixed block 39; the threaded shaft 37 is threadedly connected to the inner ring 31; and the fixed block 39 is made of elastic material.

[0024] The fixing mechanism 20 also includes: two pressure sensors 41 are respectively fixed on one end of the fixing block 39 close to each other; two controllers 34 are respectively fixed on the two movable plates 33; two connecting lines 42 are respectively connected to two groups of the controllers 34 and the pressure sensors 41 close to each other; wherein the movable plate 33 is electrically connected to the motor 35 and can control the opening and closing of the motor 35; the pressure sensor 41 can monitor the pressure and then control the closing of the motor 35 through the controller 34 to prevent the fixing block 39 from squeezing the pipe sleeve with too much force, thereby damaging the pipe sleeve.

[0025] When it is necessary to execute the step S2 to insert the thermocouple wire into the tube, multiple fixing mechanisms 20 are connected up and down according to the length of the sleeve, and then the sliding plate 22 is passed through the sleeve, and one end of the thermocouple wire to be inserted into the tube is passed through the clamping hole 23 and fixed on the sliding plate 22; At this time, the sleeve is placed between the multiple inner rings 31, and the motor 35 is started to drive the threaded shaft 37 to rotate, thereby driving the threaded shaft 37 and the fixing block 39 to move through the thread. Due to the restriction of the sliding rod 38, the two fixing blocks 39 move closer to each other, thereby fixing the sleeve located between the two fixing blocks 39. During the fixing process, the pressure sensor 41 monitors the extrusion pressure. When the fixing pressure is sufficient, the controller 34 turns off the motor 35 to complete the fixing of the sleeve. After the casing is fixed, the motor 45 is started to drive the winding wheel 14 to rotate to wind the pipe 17, and then the sliding plate 22 is driven to move vertically downward after passing through the guide wheel 21, thereby pulling the thermocouple wire into the casing until the sliding plate 22 moves to the lowermost end of the casing. At this time, magnesium oxide is filled into the sleeve. During filling, the starting motor 45 drives the transmission shaft 43 and the transmission wheel 44 to rotate, thereby driving the rotating ring 28 of the lowermost fixing mechanism 20 to rotate, and then driving all the fixing mechanisms 20 to rotate. When the fixing mechanisms 20 rotate, the sleeve is rotated, so that the filled magnesium oxide can be driven by the rotating sleeve to fill the gap, so that the filling rate is higher; At the same time, the air pump 15 is started to extract the gas in the pipeline 17, so that the gas in the inner sleeve on the upper side of the sliding plate 22 is extracted to form a negative pressure, so that the magnesium oxide can be filled more fully.

[0026] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A process for assembling an armored thermocouple, characterized in that: The following steps are involved: S1. Thermocouple wire pretreatment Annealing the thermocouple wire: eliminating internal stress in the wire and improving stability; S2. Thermocouple wire tube filling Insert the thermocouple wire into the casing and vibrate to fill it with dense magnesium oxide to ensure that there are no gaps. Since the filling density of magnesium oxide affects the thermal conductivity and response speed, use casing filling auxiliary equipment to assist in the insertion and filling of the thermocouple wire to increase the magnesium oxide filling rate. S3.Drawing and reducing Through multiple drawing or rolling, the diameter of the sleeve into which the thermocouple wire is inserted is gradually reduced to form a compact structure. Annealing: eliminates processing stress and restores material ductility; S4. End seal Welding (argon arc welding, laser welding) at the measuring end forms a sealed node to protect the thermocouple wire, and epoxy resin, high temperature glue or metal cap is used to seal the non-measuring end to prevent magnesium oxide from absorbing moisture; S5. Bending and forming Bend into U-shape, spiral shape, etc. according to installation requirements, with a bending radius ≥ 5 times the casing diameter to avoid cracking; S6. Performance Test Perform insulation resistance tests, insulation continuity checks, and calibration verification.

2. The armored thermocouple assembly process according to claim 1, characterized in that: The casing loading auxiliary equipment in step 2 includes a support seat (11), The motor (45) is fixedly mounted on the upper end of the support seat (11). The winding shaft (13) is connected to the lower end of the motor (45). A winding wheel (14) is fixedly connected to the winding shaft (13). The air pump (15) is fixedly mounted on the lower end of the winding wheel (14). A pipe (17) has one end passing through and fixedly connected to the winding wheel (14). The sliding plate (22) is fixedly connected to the other end of the pipe (17) through the mounting ring (24). A plurality of clamping holes (23) are provided through the sliding plate (22). The connecting ring (25) is rotatably connected to the upper end of the support seat (11). The fixing mechanism (20) is provided with a plurality of fixing mechanisms provided on the upper end of the support seat (11). The pipe (17) is fixedly connected to a permeable membrane that only passes gas at one end away from the air pump (15), and the pipe (17) passes through one end of the winding wheel (14) and is connected to the air pump (15). The middle part of the pipe (17) is wound on the winding wheel (14). The number of the clamping holes (23) is the same as the number of thermocouple wires that require sleeves. The size of the clamping holes (23) is the same as the thermocouple wires that require sleeves. The side walls of the clamping holes (23) are made of elastic material and can clamp and fix the thermocouple wires. Multiple fixing mechanisms (20) are connected up and down, and the lowermost fixing mechanism (20) is connected to the support seat (11) through the connecting ring (25). The fixing mechanism (20) is used to fix the sleeve.

3. The casing filling auxiliary device according to claim 2, characterized in that: Casing filling auxiliary equipment also includes; The side plate (18) is provided with two fixedly connected to the lower end surface of the support seat (11), The rotating shaft (19) is rotatably connected between the two side plates (18). The guide wheel (21) is fixedly connected to the rotating shaft (19). The pipeline (17) passes around the guide wheel (21) and changes direction so that the axis direction faces directly upwards.

4. The casing filling auxiliary device according to claim 3, characterized in that: The casing filling auxiliary equipment also includes: The casing filling auxiliary equipment also includes: A transmission shaft (43) is connected to the motor (45). The transmission wheel (44) is fixedly connected to the transmission shaft (43).

5. The casing filling auxiliary device according to claim 4, characterized in that: The casing filling auxiliary equipment also includes: The casing filling auxiliary equipment also includes: The supporting legs (10) are provided with four legs fixedly connected to the lower ends of the supporting base (11).

6. The casing filling auxiliary device according to claim 5, characterized in that: The casing filling auxiliary device further comprises: the fixing mechanism (20) comprises, A rotating ring (28) is provided on the upper side of the support seat (11). The support column (27) is provided with two fixedly connected to the inner side wall of the rotating ring (28), The connecting pipe (26) is provided with two connecting pipes fixedly connected to the lower sides of the two supporting columns (27). The connecting rod (29) is provided with two connecting rods respectively fixedly connected to the upper sides of the two supporting columns (27). The rotating ring (28) is frictionally engaged with the transmission wheel (44), the axis of the rotating ring (28) coincides with the axis of the sliding plate (22), the connecting tube (26) can be inserted into the groove provided on the connecting ring (25), so as to realize the fixed connection between the connecting tube (26) and the connecting ring (25), the axis of the connecting rod (29) coincides with the axis of the connecting tube (26), the connecting tube (26) is provided with a sliding groove that is slidably connected to the connecting rod (29), and the connecting tube (26) is fixed by the sliding connection between the connecting tube (26) and the connecting rod (29).

7. The casing filling auxiliary device according to claim 6, characterized in that: The casing filling auxiliary device further comprises: the fixing mechanism (20) further comprises: The inner ring (31) is fixedly connected to the two support columns (27). The sliding rod (38) is provided with two sliding rods respectively connected to the side walls of the inner ring (31).

8. The casing filling auxiliary device according to claim 7, characterized in that: The casing filling auxiliary device further comprises: the fixing mechanism (20) further comprises: The movable plate (33) is provided with two ends fixedly connected to the two sliding rods (38) and away from each other. The motor (35) is provided with two motors respectively fixed on the two movable plates (33). The threaded shaft (37) is provided with two power connections to the two motors (35), The fixed block (39) is provided with two pieces of fixed block (39), which are respectively rotatably connected to the two threaded shafts (37) and close to one end surface of each other. The sliding rods (38) are close to each other at one end and pass through the inner ring (31) and are fixedly connected to the fixing block (39); the threaded shaft (37) is threadedly connected to the inner ring (31); and the fixing block (39) is made of elastic material.

9. The casing filling auxiliary device according to claim 8, characterized in that: The casing filling auxiliary device further comprises: the fixing mechanism (20) further comprises: The pressure sensor (41) is provided with two pressure sensors respectively fixed on the fixing block (39) and close to one end of each other. The controller (34) is provided with two fixedly mounted on the two movable plates (33), The connecting line (42) is provided with two connecting lines respectively connected to two groups of the controller (34) and the pressure sensor (41) close to each other. The movable plate (33) is electrically connected to the motor (35) and is capable of controlling the start and stop of the motor (35), and the pressure sensor (41) is capable of monitoring pressure.

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