Thermocouple telescoping mechanism

By designing a sliding sleeve, drive, and guide mechanism, the thermocouple's high-temperature section automatically retracts and its low-temperature section automatically extends, solving the problems of easy damage and insufficient sealing of the thermocouple in the high-temperature section, and achieving efficient temperature measurement and high-vacuum sealing.

CN121740260APending Publication Date: 2026-03-27SHANGHAI HANHONG PRECISION MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing thermocouples are easily damaged in the high-temperature range, cannot efficiently switch between high and low temperature ranges, and lack high vacuum sealing.

Method used

A thermocouple telescopic mechanism including a sliding sleeve mechanism, a driving mechanism, and a guiding mechanism was designed. The thermocouple is driven by a cylinder to extend and retract inside the graphite sleeve. Combined with the guidance of a linear guide module, it realizes automatic retraction protection in the high-temperature section and automatic extension for temperature measurement in the low-temperature section. A sealing ring ensures high vacuum sealing.

Benefits of technology

It achieves automatic retraction protection of thermocouples in the high-temperature range to avoid damage, ensures high-precision temperature measurement in the low-temperature range, and has high vacuum sealing performance, solving the problems of limited temperature resistance and sealing of thermocouples in the high-temperature range.

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Abstract

The invention relates to a thermocouple telescoping mechanism. A thermocouple telescoping mechanism comprises a sliding sleeve mechanism, a driving mechanism and a guiding mechanism. The sliding sleeve mechanism comprises a mounting seat and a sliding sleeve seat, the sliding sleeve seat is detachably connected with the mounting seat, a sliding sleeve is slidably connected to the outer side of the sliding sleeve seat, a thermocouple mounting seat is mounted on the sliding sleeve, a mounting hole for mounting a thermocouple is formed in the center of the thermocouple mounting seat, and the thermocouple is mounted on the thermocouple mounting seat; the mounting seat is provided with a through hole through which the graphite sleeve penetrates, the graphite sleeve is mounted at the through hole, one axial end of the graphite sleeve is open, the other axial end of the graphite sleeve is closed, and the thermocouple extends into the graphite sleeve from the open end of the graphite sleeve and axially moves in the graphite sleeve; the driving mechanism comprises a cylinder, a telescopic rod of the cylinder is connected with the thermocouple mounting seat, and the cylinder is mounted on the mounting seat. According to the invention, the thermocouple is driven to move through the air cylinder, so that the thermocouple extends and retreats.
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Description

Technical Field

[0001] This invention relates to the field of mechanical technology, specifically to a thermocouple telescopic mechanism. Background Technology

[0002] SiC ceramics not only possess excellent room-temperature mechanical properties, such as high flexural strength, excellent oxidation resistance, good corrosion resistance, high wear resistance, and low coefficient of friction, but also exhibit the best high-temperature mechanical properties (strength, creep resistance, etc.) among known ceramic materials. In the field of silicon carbide ceramic processing, heat treatment is an indispensable and crucial process. The heat treatment temperature typically ranges from 300℃ to 2000℃, depending on the stage of the process. Temperature monitoring requires the use of both thermocouples and infrared thermometers; thermocouples are used for temperature measurement in the low-temperature range (e.g., below 1000℃), while infrared thermometers are used for the high-temperature range (e.g., above 1000℃).

[0003] Thermocouples typically withstand temperatures up to around 1600℃. To protect thermocouples from damage at high temperatures, there is an urgent need for a thermocouple telescopic mechanism that can switch between extension and retraction. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a thermocouple telescopic mechanism to solve at least one of the above technical problems.

[0005] To achieve the above objectives, the present invention provides a thermocouple telescopic mechanism, characterized in that it includes a sliding sleeve mechanism, a driving mechanism, and a guiding mechanism;

[0006] The sliding sleeve mechanism includes a mounting base and a sliding sleeve base. The sliding sleeve base is detachably connected to the mounting base. A sliding sleeve is slidably connected to the outer side of the sliding sleeve base. A thermocouple mounting base is installed on the sliding sleeve. A mounting hole for installing a thermocouple is opened in the center of the thermocouple mounting base. A thermocouple is installed on the thermocouple mounting base.

[0007] The mounting base has a through hole for inserting a graphite sleeve. The graphite sleeve is installed at the through hole. One end of the graphite sleeve is open in the axial direction, and the other end is closed. The thermocouple extends into the open end of the graphite sleeve and moves axially inside the graphite sleeve.

[0008] The drive mechanism includes a cylinder, the telescopic rod of which is connected to the thermocouple mounting base, and the cylinder is mounted on the mounting base;

[0009] The guiding mechanism includes a guide rail module, which is mounted on the mounting bracket. The mounting bracket is detachably mounted on the mounting base. The guide rail module is connected to the thermocouple mounting base via an adapter plate.

[0010] The application drives the movement of the thermocouple by the cylinder, and then realizes the extension and retraction of the thermocouple. The thermocouple is inserted into the graphite sleeve to protect the thermocouple.

[0011] Further preferably, the mounting seat is used for fixedly mounting at the cavity flange;

[0012] The closed end of the graphite sleeve extends into the cavity through the cavity flange;

[0013] The open end of the graphite sleeve is located on the axial outside of the cavity flange;

[0014] When the cylinder is in the elongated state, the sensing end of the thermocouple is located on the axial outside of the cavity flange;

[0015] When the cylinder is in the shortened state, the sensing end of the thermocouple is located on the axial inside of the cavity flange.

[0016] Further preferably, a locking nut is threadedly connected on the mounting seat;

[0017] The inner wall of the locking nut is threadedly connected with the graphite sleeve.

[0018] It is convenient to adjust the depth of the graphite sleeve. The graphite sleeve is fixed by the locking nut, and the depth of the graphite sleeve extending into the cavity can be adjusted as needed.

[0019] Further preferably, a sealing ring is clamped between the mounting seat and the sliding sleeve seat;

[0020] A sealing ring is clamped between the sliding sleeve seat and the sliding sleeve;

[0021] A sealing ring is clamped between the sliding sleeve and the thermocouple mounting seat;

[0022] A sealing ring is clamped between the thermocouple mounting seat and the thermocouple.

[0023] Further preferably, a flange plate is arranged on the outside of the sliding sleeve;

[0024] The thermocouple mounting seat is an installation sleeve with an open end in the axial direction, the open end of the installation sleeve is provided with an installation disc extending radially outward, the installation disc and the compression flange are clamped on both sides of the flange plate, and the installation flange, the flange plate and the compression flange are connected by bolts.

[0025] Further preferably, a limiting bolt is detachably connected on the compression flange, and the limiting bolt is used to abut against the sliding sleeve seat.

[0026] It is convenient to mechanically limit the extension position of the thermocouple by the limiting bolt.

[0027] Further preferably, an axially outwardly extending extension nozzle is arranged at the distal end of the mounting sleeve, and a sealing ring is arranged between the inner wall of the extension nozzle and the thermocouple.

[0028] Further preferably, the piston rod end of the cylinder is connected to a cylinder adapter plate through a floating joint, and the cylinder adapter plate is connected to the thermocouple mounting seat.

[0029] The cylinder adapter plate is a stepped bent plate.

[0030] The cylinder adapter plate is connected to the axially distal end of the mounting sleeve from the mounting seat.

[0031] The adapter plate is connected to the end of the mounting sleeve adjacent to the mounting seat.

[0032] Further preferably, the adapter plate is an L-shaped adapter plate.

[0033] Further preferably, a stopper is detachably connected to one end of the mounting bracket away from the mounting seat, and the stopper is located at the end of the guide rail module.

[0034] Prevent the sliding block from falling out.

[0035] Further preferably, the guide rail module comprises a slidingly connected guide rail and a sliding block, the guide rail is fixed on the mounting bracket, and the sliding block is provided with the adapter plate.

[0036] Compared with the prior art, the beneficial effects of the present application are:

[0037] The present application uses a cylinder to drive the extension and retraction, which is simple and efficient. The thermocouple is automatically retracted in the high-temperature section to protect the thermocouple, and is automatically extended in the low-temperature section to realize temperature measurement. The problem of limited temperature resistance of the thermocouple in the high-temperature section and easy damage by high temperature is solved. The problem of using a thermocouple for high-precision temperature measurement in the low-temperature section is solved.

[0038] The present application realizes high-vacuum sealing and is suitable for environments with high sealing requirements. The problem of realizing high-vacuum sealing of the thermocouple and the thermocouple extension mechanism is solved.

[0039] The present application uses a linear guide rail module for guidance, which has good guidance. Through structural design, the problem of possible jamming of the thermocouple during reciprocating extension and retraction is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic view of embodiment 1 of the present application.

[0041] Figure 2 is a structural schematic view of embodiment 1 of the present application.

[0042] Figure 3 is a sectional view of the embodiment 1 of the present application;

[0043] Figure 4 is a structural schematic view of the driving mechanism of the embodiment 1 of the present application;

[0044] Figure 5 is a structural schematic view of the sliding sleeve structure of the embodiment 1 of the present application.

[0045] 1, sliding sleeve mechanism;

[0046] 11 is a mounting seat, 12 is a graphite sleeve, 13 is a locking nut, 14 is a sliding sleeve seat, 15 is a sliding sleeve, 16 is a pressing flange, 17 is a thermocouple mounting seat, 18 is a thermocouple, 19 is a limiting bolt;

[0047] 2 is a driving mechanism;

[0048] 21 is a cylinder adapter plate, 22 is a cylinder, 23 is a floating joint, 24 is a connecting plate;

[0049] 3 is a guide mechanism;

[0050] 31 is a mounting bracket, 32 is a guide rail module, 33 is an adapter plate, 34 is a stop block. DETAILED DESCRIPTION

[0051] The present application will be further described below in conjunction with the drawings.

[0052] Referring to Figures 1 to 5, specific embodiment 1: a thermocouple telescopic mechanism, comprising a sliding sleeve 15 mechanism 1, a driving mechanism 2 and a guide mechanism 3;The sliding sleeve 15 mechanism 1 comprises a mounting seat 11 and a sliding sleeve seat 14, the sliding sleeve seat 14 is detachably connected with the mounting seat 11, the outer side of the sliding sleeve seat 14 is slidably connected with a sliding sleeve 15, the sliding sleeve 15 is provided with a thermocouple mounting seat 17, the central part of the thermocouple mounting seat 17 is provided with a mounting hole for mounting a thermocouple 18, and the thermocouple mounting seat 17 is provided with a thermocouple 18;A through hole for passing through a graphite sleeve 12 is formed in the mounting seat 11, the graphite sleeve 12 is installed at the through hole, one end of the graphite sleeve 12 is open in the axial direction, the other end is closed, the thermocouple 18 extends into the graphite sleeve 12 from the open end of the graphite sleeve 12 and moves axially in the graphite sleeve 12;The driving mechanism 2 comprises a gas cylinder 22, the telescopic rod of the gas cylinder 22 is connected with the thermocouple mounting seat 17, and the gas cylinder 22 is installed on the mounting seat 11;The guide mechanism 3 comprises a guide rail module 32, the guide rail module 32 is installed on a mounting bracket 31, the mounting bracket 31 is detachably installed on the mounting seat 11, and the guide rail module 32 is connected with the thermocouple mounting seat 17 through an adapter plate 33. The movement of the thermocouple 18 is driven by the gas cylinder 22, so that the thermocouple 18 is extended and retracted. The thermocouple 18 is inserted into the graphite sleeve 12, which protects the thermocouple 18.

[0053] The driving mechanism 2 and the guide mechanism 3 are located on the outer side of the thermocouple mounting seat 17, and the interval angle in the circumferential direction is 90°. The sealing connection between the sliding sleeve seat and the sliding sleeve, the sealing connection between the sliding sleeve and the thermocouple mounting seat, the connection between the guide mechanism and the thermocouple mounting seat and the connection between the driving mechanism and the thermocouple mounting seat are arranged along the axial direction from the side close to the mounting seat to the side away from the mounting seat.

[0054] The mounting seat 11 is used for fixedly installing at the cavity flange;The closed end of the graphite sleeve 12 extends into the cavity through the cavity flange;The open end of the graphite sleeve 12 is located on the axial outside of the cavity flange;When the gas cylinder 22 is in the elongated state, the sensing end of the thermocouple 18 is located on the axial outside of the cavity flange;When the gas cylinder 22 is in the shortened state, the sensing end of the thermocouple 18 is located on the axial inside of the cavity flange.

[0055] The mounting seat 11 is threadedly connected with a locking nut 13;The inner wall of the locking nut 13 is threadedly connected with the graphite sleeve 12. It is convenient to adjust the depth of the graphite sleeve 12. The graphite sleeve 12 is fixed by the locking nut 13, and the depth of the graphite sleeve 12 extending into the cavity can be adjusted as required.

[0056] Sealing rings are clamped between the mounting seat 11 and the sliding sleeve seat 14, between the sliding sleeve seat 14 and the sliding sleeve 15, between the sliding sleeve 15 and the thermocouple mounting seat 17, and between the thermocouple mounting seat 17 and the thermocouple 18.

[0057] The outer side of the sliding sleeve 15 is provided with a flange plate; the thermocouple mounting seat 17 is an installation sleeve with an open end in the axial direction, the open end of the installation sleeve is provided with an installation disc extending radially outward, the installation disc and the compression flange 16 are clamped on both sides of the flange plate, and the installation flange, the flange plate and the compression flange 16 are connected by bolts. The compression flange 16 is detachably connected with a limiting bolt 19, and the limiting bolt 19 is used to abut against the sliding sleeve seat 14. The limiting bolt 19 is used to realize mechanical limiting of the extension position of the thermocouple 18. The installation sleeve is provided with an extension nozzle extending axially outward away from the open end, and a sealing ring is clamped between the inner wall of the extension nozzle and the thermocouple 18.

[0058] The piston rod end of the cylinder 22 is connected to the cylinder adapter plate 33 through a floating joint 23, and the cylinder connecting plate 24 is connected to the thermocouple mounting seat 17; the cylinder connecting plate 24 is a stepped bent plate; the cylinder connecting plate 24 is connected to the axial end of the installation sleeve away from the mounting seat 11; and the adapter plate 33 is connected to the end of the installation sleeve adjacent to the mounting seat 11. The adapter plate 33 is an L-shaped adapter plate 33. The cylinder 22 is installed on the mounting seat 11 through the cylinder adapter plate 21.

[0059] The end of the mounting bracket 31 away from the mounting seat 11 is detachably connected with a stop block, and the stop block 34 is located at the end of the guide rail module 32. The stop block 34 prevents the sliding block from falling out.

[0060] The guide rail module 32 includes a guide rail and a sliding block connected in sliding mode, the guide rail is fixed on the mounting bracket 31, and the sliding block is provided with the adapter plate 33.

[0061] The movement of the cylinder 22 can be controlled by PLC, and the real-time temperature monitored by the thermocouple 18 and the infrared temperature detector is fed back to the PLC, so as to realize closed-loop control.

[0062] If the temperature is higher than the set value (for example, 1000℃), the PLC automatically controls the cylinder 22 to eject, so as to drive the thermocouple 18 to retreat, thereby avoiding the thermocouple 18 from being burned out due to the excessively high temperature.

[0063] If the temperature is lower than the set value (for example, 1000℃), the PLC automatically controls the cylinder 22 to retract, so as to drive the thermocouple 18 to extend, and the thermocouple 18 can work normally to measure the temperature.

[0064] The cylinder 22 is provided with two limiting switches in front and back, which can communicate with the upper computer through the PLC, and can indicate in real time on the display screen whether the thermocouple 18 is in the extended state or the retreated state.

[0065] The above is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the present application.

Claims

1. A thermocouple telescopic mechanism, characterized in that, This includes the sliding sleeve mechanism, the drive mechanism, and the guide mechanism; The sliding sleeve mechanism includes a mounting base and a sliding sleeve base. The sliding sleeve base is detachably connected to the mounting base. A sliding sleeve is slidably connected to the outer side of the sliding sleeve base. A thermocouple mounting base is installed on the sliding sleeve. A mounting hole for installing a thermocouple is opened in the center of the thermocouple mounting base. A thermocouple is installed on the thermocouple mounting base. The mounting base has a through hole for inserting a graphite sleeve. The graphite sleeve is installed at the through hole. One end of the graphite sleeve is open in the axial direction, and the other end is closed. The thermocouple extends into the open end of the graphite sleeve and moves axially inside the graphite sleeve. The drive mechanism includes a cylinder, the telescopic rod of which is connected to the thermocouple mounting base, and the cylinder is mounted on the mounting base; The guiding mechanism includes a guide rail module, which is mounted on the mounting bracket. The mounting bracket is detachably mounted on the mounting base. The guide rail module is connected to the thermocouple mounting base via an adapter plate.

2. The thermocouple telescopic mechanism according to claim 1, characterized in that: The mounting base is used for fixed installation at the cavity flange; The closed end of the graphite sleeve extends into the cavity through the cavity flange; The open end of the graphite sleeve is located axially outside the cavity flange; When the cylinder is in the extended state, the sensing end of the thermocouple is located on the axial outside of the cavity flange; When the cylinder is in the shortened state, the sensing end of the thermocouple is located on the axial inner side of the cavity flange.

3. The thermocouple telescopic mechanism according to claim 1, characterized in that: The mounting base is threaded with a lock nut; The inner wall of the locking nut is threaded with the graphite sleeve.

4. The thermocouple telescopic mechanism according to claim 1, characterized in that: A sealing ring is provided between the mounting base and the sliding sleeve base; A sealing ring is sandwiched between the sliding sleeve seat and the sliding sleeve; A sealing ring is provided between the sliding sleeve and the thermocouple mounting base; A sealing ring is sandwiched between the thermocouple mounting base and the thermocouple.

5. A thermocouple telescopic mechanism according to claim 1, characterized in that: A flange is provided on the outer side of the sliding sleeve; The thermocouple mounting base is an axially open mounting sleeve. The open end of the mounting sleeve is provided with a radially outwardly extending mounting plate. The mounting plate and the clamping flange are sandwiched on both sides of the flange, and the mounting flange, the flange and the clamping flange are connected by bolts.

6. A thermocouple telescopic mechanism according to claim 5, characterized in that: A limit bolt is detachably connected to the clamping flange, and the limit bolt is used to abut against the sliding sleeve seat.

7. A thermocouple telescopic mechanism according to claim 5, characterized in that: The mounting sleeve has an axially outwardly extending extension nozzle located away from the opening end, and a sealing ring is clamped between the inner wall of the extension nozzle and the thermocouple.

8. A thermocouple telescopic mechanism according to claim 5, characterized in that: The piston rod end of the cylinder is connected to the cylinder adapter plate via a floating joint, and the cylinder adapter plate is connected to the thermocouple mounting base; The cylinder connecting plate is a stepped bent plate; The cylinder connecting plate connects to the axial end of the mounting sleeve away from the mounting base; The adapter plate connects to the end of the mounting sleeve adjacent to the mounting base.

9. A thermocouple telescopic mechanism according to claim 1, characterized in that: The adapter plate is an L-shaped adapter plate.

10. A thermocouple telescopic mechanism according to claim 1, characterized in that: A stop block is detachably connected to one end of the mounting bracket away from the mounting base, and the stop block is located at the end of the guide rail module.