A high-temperature tubular furnace

Abstract

This application discloses a high-temperature tubular furnace, including a furnace body and furnace tubes, and a material turning mechanism. The material turning mechanism includes a sliding rod slidably connected to the connecting end, a rotating rod rotatably disposed within the sliding rod, and a power source for driving the sliding rod to rotate. A connecting seat is provided at one end of the sliding rod inside the furnace tube. A receiving plate is provided on the connecting seat, and a rotating seat is rotatably disposed on the connecting seat. A sample plate is disposed on the rotating seat. The sliding rod rotatably passes through the connecting seat and connects with the rotating seat. The receiving plate and the sample plate are concentrically arranged, and the outer wall of the sample plate abuts against the inner wall of the receiving plate. The sample plate is slidably connected to the rotating seat along the axial direction of the rotating seat, and the rotating rod can drive the sample plate to slide when sliding within the sliding rod. This application has the effect of stirring the sample during sintering.

Description

Technical Field

[0001] This application relates to the technical field of sintering equipment, and in particular to a high-temperature tubular furnace. Background Technology

[0002] High-temperature tube furnaces are a common sintering equipment used in laboratories. They are mainly used for high-temperature sintering and high-temperature solid-state reactions of materials such as powder particles. They have advantages such as short cycle time and easy temperature control, and have gradually become a commonly used heat treatment equipment in research institutions.

[0003] A Chinese patent application with application number 201610018974.1 discloses a high-temperature tube furnace, including a furnace body, a quartz furnace tube installed in the furnace body, and a sliding rod slidably installed on the right furnace door. One end of the sliding rod is located in the quartz furnace tube and is equipped with a sample stage. After the sample is placed on the sample stage, it is heat-treated in the quartz furnace tube. After heat treatment, the sample stage is moved out of the left furnace door by driving the sliding rod to take a sample.

[0004] In this technical solution, the sample is placed on the test stage for high-temperature treatment in a quartz furnace tube. Due to the influence of heat transfer efficiency, the temperature of the powder surface will be higher than the temperature inside the powder. The existence of temperature difference can easily affect the reaction rate and extent. If the powder sample is stirred and mixed by opening the furnace, it is necessary to cool down and heat up again, which will affect the test efficiency. Therefore, there is still room for improvement. Summary of the Invention

[0005] This application provides a high-temperature tube furnace that can mix powder multiple times during operation, thereby making the powder more fully and uniformly mixed in high-temperature treatments such as sintering, which is beneficial for high-temperature sintering experiments.

[0006] The technical solution adopted in this application is as follows:

[0007] A high-temperature tubular furnace includes a furnace body and a furnace tube, one end of which is a sampling end and the other end is a connecting end. It also includes a material-turning mechanism, comprising a sliding rod slidably connected to the connecting end, a rotating rod rotatably disposed within the sliding rod, and a power source for driving the sliding rod to rotate. A connecting seat is provided at one end of the sliding rod within the furnace tube, a receiving plate is provided on the connecting seat, a rotating seat is rotatably disposed on the connecting seat, and a sample plate is disposed on the rotating seat. The sliding rod rotatably passes through the connecting seat and connects with the rotating seat. Both the receiving plate and the sample plate are semi-circular structures with upward-facing openings. The receiving plate and the sample plate are concentrically arranged, and the outer wall of the sample plate abuts against the inner wall of the receiving plate. The sample plate is slidably connected to the rotating seat along the axial direction of the rotating seat, and the rotating rod can drive the sample plate to slide when sliding within the sliding rod.

[0008] When the receiving plate is located below the sample plate, the length of the receiving plate is greater than the length of the sample plate. By driving the rotating rod to rotate, the sample plate can be moved above the receiving plate. By sliding the rotating rod, the length of the sample plate becomes greater than the length of the receiving plate. The power source drives the sliding rod and the rotating rod to rotate synchronously, so that the receiving plate is located directly above the sample plate. Then, by rotating the sliding rod, the receiving plate is moved back to below the sample plate.

[0009] By employing the above technical solution, the sample is placed on a sample plate with a semi-circular structure, allowing for more thorough heat treatment. When stirring the sample, the rotating rod first drives the rotating seat to rotate, causing the sample plate to move directly above the receiving plate and form a circular structure. During this process, the sample falls onto the receiving plate. Next, the sliding rod and rotating rod rotate synchronously 180 degrees, positioning the receiving plate above and the sample plate below, allowing the sample to fall back onto the sample plate. During this process, the length of the sample plate is greater than the length of the receiving plate, ensuring better sample placement. Finally, by driving the sliding rod to rotate 180 degrees again, the receiving plate is positioned below the sample plate, thus completing the mixing of the sample.

[0010] Optionally, the outer wall of the sliding rod is rotatably provided with a bracket, the lower end of the bracket is slidably connected to a support plate, the sliding direction of the bracket on the support plate is parallel to the length direction of the furnace tube, and the power source is installed on the bracket and cooperates with the sliding rod.

[0011] Optionally, the connecting seat has a receiving groove, the rotating seat is rotatably connected to the receiving groove, and there is a distance between the inner end face of the rotating seat and the receiving groove. A connecting shaft is coaxially arranged on the rotating seat, and the connecting shaft rotatably passes through the connecting seat and extends into the inner cavity of the sliding rod. The connecting shaft is slidably inserted into one end of the rotating rod, and the rotation of the rotating rod synchronously drives the connecting shaft to rotate. A positioning element is provided in the inner cavity of the connecting shaft, and the positioning element cooperates with the inner wall of the sliding rod to restrict the rotation of the connecting shaft. A connecting member is also installed on the connecting shaft, and the connecting member is connected to the sample plate. When the rotating rod slides towards the connecting shaft, the positioning effect of the positioning element on the connecting shaft is first released, and then it continues to slide through the connecting member to make the sample plate slide away from the rotating seat.

[0012] By adopting the above technical solution, during the experiment, the positioning component positions the connecting shaft, making it difficult for the connecting shaft to rotate freely in the sliding rod. After the rotating rod slides a short distance, the positioning effect of the positioning component is released. Then, the rotating rod can be rotated 180 degrees to drive the rotating seat to rotate 180 degrees, so that the sample plate is above the receiving plate. Then, the rotating rod is driven to continue sliding, thereby driving the sample plate to slide, so that the length of the sample plate is greater than that of the receiving plate, thus allowing the sample to fall more effectively onto the sample plate during the rotation of the sliding rod.

[0013] Optionally, the positioning element includes a positioning ring slidably sleeved on the outer wall of the connecting shaft, and an elastic element disposed on the outer wall of the connecting shaft. The inner wall of the sliding rod is provided with a stepped surface. The elastic element can drive the positioning ring to abut against the stepped surface. The side of the positioning ring and the stepped surface that abut against each other are both rough structures. When the sliding rod moves in the direction of the connecting shaft, it can abut against the positioning ring and drive the positioning ring and the stepped surface to separate.

[0014] Optionally, the connecting shaft has an installation cavity, and the connecting member consists of a connecting rod slidably connected to the installation cavity and a reset member connected between the connecting rod and the inner wall of the installation cavity. The connecting shaft has a clearance groove on its side wall in the receiving groove, and the clearance groove is connected to the installation cavity. The rotating seat has a sliding groove, and the sample plate is slidably connected to the sliding groove. A support rod is provided on the sample plate, which passes through the rotating seat and extends from the clearance groove into the installation cavity, and is connected to the connecting rod. One end of the sliding rod has a slot, and the connecting shaft is inserted into the slot. One end of the connecting rod extends from the end of the connecting shaft into the slot. When the sliding rod slides towards the connecting shaft, it pushes the positioning ring and the stepped surface to separate. The end face of the slot abuts against the end face of the connecting rod. The sliding rod continues to slide, thereby pushing the connecting rod to slide, and the reset member is compressed.

[0015] By adopting the above technical solution, when the rotating rod slides, the inner end face of the slot abuts against the end of the connecting rod and pushes the connecting rod to slide, thereby driving the sample plate to slide, and the reset component provides the resetting force for the connecting rod.

[0016] Optionally, the two ends of the sample plate are provided with inclined surfaces that extend to both sides.

[0017] By adopting the above technical solution, the sample on the receiving plate is more likely to fall onto the sample plate during the rotation of the sliding rod.

[0018] Optionally, the rotating rod has an annular protrusion on one end of its sidewall extending beyond the sliding rod. A positioning plate is rotatably mounted on the outer wall of the annular protrusion. A driving component connected to the positioning plate is mounted on the bracket. The driving component is used to drive the rotating rod to slide along the axial direction. The end of the annular protrusion facing the sliding rod has a rough structure. When the sample plate slides to the maximum distance, the annular protrusion abuts against the end of the sliding rod.

[0019] By adopting the above technical solution, the annular protrusion abuts against the end face of the sliding rod, thereby causing the sliding rod to rotate synchronously and drive the rotating rod to rotate.

[0020] Optionally, the outer wall of the coupling is provided with a guide block, and the inner wall of the slot is provided with a guide groove for the guide block to slide.

[0021] Optionally, the power source includes a motor mounted on the bracket, a sprocket is provided on the output shaft of the motor, and a synchronization chain is connected between the outer wall of the sliding rod and the sprocket.

[0022] In summary, this application includes at least one of the following beneficial effects:

[0023] 1. The sample plate has an open semi-circular structure, which allows for better heat transfer and promotes the reaction. During the heat treatment process, the sample is first transferred to the receiving plate and then back to the sample plate through the cooperation of the sliding rod and the rotating rod, so that the sample is mixed. The sample can be stirred without opening the furnace, thus making the sample reaction more complete. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0025] Figure 2 This is a cross-sectional schematic diagram of the furnace tube in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the material turning mechanism in an embodiment of this application;

[0027] Figure 4 This is a cross-sectional schematic diagram of the material turning mechanism in the embodiments of this application;

[0028] Figure 5 yes Figure 1 Enlarged diagram of point A in the middle.

[0029] Explanation of reference numerals in the attached drawings: 1. Heating furnace body; 2. Furnace tube; 3. Sampling end; 4. Connecting end; 5. Turning mechanism; 51. Sliding rod; 52. Rotating rod; 53. Power source; 531. Motor; 532. Sprocket; 533. Synchronous chain; 6. Connecting seat; 7. Receiving plate; 8. Rotating seat; 9. Sample plate; 10. Bracket; 11. Support plate; 12. Receiving groove; 13. Connecting shaft; 14. Positioning component; 141. Elastic component; 142. Positioning ring; 15. Connecting component; 151. Connecting rod; 152. Reset component; 16. Stepped surface; 17. Mounting cavity; 18. Relief groove; 19. Sliding groove; 20. Support rod; 21. Slot; 22. Inclined surface; 23. Ring protrusion; 24. Positioning plate; 25. Driving component; 26. Guide block; 27. Guide groove. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] This application discloses a high-temperature tubular furnace. (Refer to...) Figure 1 The tubular furnace includes a furnace body 1 and a furnace tube 2. The furnace tube 2 is installed in the furnace body 1. Both ends of the furnace tube 2 extend beyond the sides of the furnace body 1. One end of the furnace tube 2 is a sampling end 3, and the other end is a connection end 4. Sampling can be performed by opening the sampling end 3.

[0032] Reference Figure 1 and Figure 2 The tubular furnace also includes a material-turning mechanism 5, which comprises a sliding rod 51 slidably connected to the connecting end 4, a rotating rod 52 rotatably disposed within the sliding rod 51, and a power source 53 for driving the sliding rod 51 to rotate. The sliding rod 51 slides through the furnace tube 2 from the connecting end 4 and can slide and rotate on the connecting end 4. A connecting seat 6 is fixed to one end of the sliding rod 51 inside the furnace tube 2, and a receiving plate 7 is fixed to the side of the connecting seat 6 opposite to the sliding rod 51. A rotating seat 8 is rotatably mounted on the connecting seat 6, and a sample plate 9 is fixed on the rotating seat 8. The rotating seat 8 and the rotating rod 52 are connected. The sliding rod 51 has an internal hollow structure, and the rotating rod 52 slides through the inner cavity of the sliding rod 51 and can rotate within the sliding rod 51.

[0033] Reference Figure 2 and Figure 3 Both the sample plate 9 and the receiving plate 7 are semi-circular structures and are concentrically arranged. The sample plate 9 is located above the receiving plate 7 and abuts against the inner wall of the receiving plate 7. The sample to be sintered is placed on the sample plate 9. The open shape of the sample plate 9 allows for better heat transfer to the sample.

[0034] Reference Figure 1 and Figure 2A bracket 10 is rotatably mounted on the side wall of the sliding rod 51. The bracket 10 is vertically positioned, and a support plate 11 is mounted on the lower end of the bracket 10. The support plate 11 is horizontally positioned and fixed to the ground or workbench. The lower end of the bracket 10 is slidably connected using existing technologies such as pulleys, slide rails, or slider grooves. During sample taking and placement, the sliding rod 51 can be moved within the furnace tube 2 by driving the bracket 10 to slide, allowing the sample plate 9 to extend from the sampling end 3 for sample taking and placement. Then, the sample plate 9 can be moved back into the furnace tube 2 by sliding the bracket 10 on the support plate 11. The sliding of the bracket 10 can be achieved using a cylinder, lead screw, or any device capable of driving the linear movement of the bracket 10.

[0035] Reference Figure 2 and Figure 3 During the test, the rotating seat 8 is first rotated 180 degrees by the rotating rod 52, so that the sample plate 9 is directly above the receiving plate 7, and the sample plate 9 and the receiving plate 7 form a circular structure. During the movement of the sample plate 9, the sample on the sample plate 9 can fall onto the receiving plate 7. Then, the sliding rod 51 is rotated 180 degrees by the power source 53, and the rotating rod 52 also rotates synchronously, so that the receiving plate 7 is above the sample plate 9. During this process, the sample falls back onto the sample plate 9. Then, only the sliding rod 51 is driven to rotate, and the receiving plate 7 is once again positioned below the sample plate 9, thus completing the stirring of the sample. Furthermore, the two ends of the sample plate 9 are inclined surfaces 22 extending to both sides, making it easier for the sample on the receiving plate 7 to fall onto the sample plate 9.

[0036] Reference Figure 2 and Figure 4 The length of the receiving plate 7 is greater than the length of the sample plate 9 extending beyond the surface of the rotating seat 8, making it easier for the sample to fall completely onto the receiving plate 7 when the sample plate 9 rotates first. The sample plate 9 is slidably mounted on the rotating seat 8, and slides along a direction parallel to the axis of the rotating seat 8. When the sliding rod 51 and the rotating rod 52 rotate synchronously, the sample plate 9 slides a certain distance first, making the length of the sample plate 9 extending beyond the surface of the rotating seat 8 greater than the length of the receiving plate 7. This allows the sample on the receiving plate 7 to fall more completely onto the sample plate 9, and makes it less likely for it to fall into the furnace tube 2. When the receiving plate 7 rotates again to below the sample plate 9, the sample plate 9 slides back to its original position.

[0037] Reference Figure 4 The connecting seat 6 has a circular receiving groove 12, which is concentrically arranged with the connecting seat 6. The rotating seat 8 is rotatably installed in the receiving groove 12, and the rotating seat 8 achieves rotation through a mating mechanism such as annular groove and annular protrusion. After the rotating seat 8 is installed in the receiving groove 12, there is a certain distance between the inner end faces of the rotating seat 8 and the receiving groove 12.

[0038] A connecting shaft 13 is coaxially fixed to the rotating base 8. The connecting shaft 13 passes through the connecting seat 6 and extends into the inner cavity of the sliding rod 51, connecting to the rotating rod 52. One end of the rotating rod 52 has a slot 21, into which the connecting shaft 13 is slidably inserted. A guide block 26 is fixed to the outer wall of the connecting shaft 13, and a guide groove 27 is formed on the inner wall of the slot 21 for the guide block 26 to slide. When the rotating rod 52 slides in the sliding rod 51, the guide block 26 can slide in the guide groove 27. When the rotating rod 52 is driven to rotate, the connecting shaft 13 is driven to rotate, thereby driving the rotating base 8 to rotate.

[0039] A positioning element 14 is installed between the inner wall of the connecting shaft 13 and the sliding rod 51. The positioning element 14 includes a positioning ring 142 that is slidably sleeved on the outer wall of the connecting shaft 13. An elastic element 141, which is a high-temperature resistant spring such as a ceramic spring, is also sleeved on the outer wall of the connecting shaft 13. A groove-block fit is provided between the positioning ring 142 and the outer wall of the connecting shaft 13, so that the positioning ring 142 can only slide on the connecting shaft 13 and cannot rotate. The inner wall of the sliding rod 51 is provided with a stepped edge. Under the action of the elastic element 141, the positioning ring 142 abuts against the stepped surface 16. The surfaces of the stepped surface 16 and the positioning ring 142 have a rough structure, such as uniformly set teeth, anti-slip strips, etc. During operation, the positioning ring 142 is pressed tightly against the stepped surface 16, making it difficult for the connecting shaft 13 to rotate. When it is necessary to rotate the connecting shaft 13, the drive rotating rod 52 slides towards the connecting shaft 13. One end of the rotating rod 52 abuts against the positioning ring 142 and drives the positioning ring 142 to slide, so that the positioning ring 142 and the stepped surface 16 are separated.

[0040] A connector 15 is also installed on the shaft 13, and the sample plate 9 is connected to the connector 15. After the rotating rod 52 contacts the positioning ring 142 and the stepped surface 16, the rotating rod 52 continues to slide, that is, the sample plate 9 can be driven to slide through the connector 15, so that the length of the sample plate 9 is greater than that of the receiving plate 7.

[0041] Reference Figure 3As shown in Figure 4, a mounting cavity 17 is provided in the connecting shaft 13, extending to the end face of the connecting shaft 13. The connecting member 15 consists of a connecting rod 151 slidably connected in the mounting cavity 17 and a reset member 152 mounted on the outer wall of the connecting rod 151. The reset member 152 is a high-temperature resistant spring and is sleeved on the outer wall of the connecting rod 151. The inner wall of the mounting cavity 17 provides space for the reset member 152. Under the action of the reset member 152, one end of the connecting rod 151 extends beyond the end face of the connecting shaft 13. A sliding groove 19 is provided on the rotating seat 8, and the sample plate 9 is slidably inserted into the sliding groove 19. A clearance groove 18 is provided on the side wall of the connecting shaft 13 within the receiving groove 12, extending along the axial direction of the connecting shaft 13. A support rod 20 is fixed on the sample plate 9, slidingly passing through the rotating seat 8 and through the clearance groove 18 to connect with the connecting rod 151. When the rotating rod 52 slides, it first separates the positioning ring 142 from the stepped surface 16, and then drives the rotating rod 52 to rotate, which makes the rotating seat 8 rotate. Then, it continues to drive the rotating rod 52 to slide, so that the inner end face of the slot 21 abuts against the connecting rod 151, thereby pushing the connecting rod 151 to slide, and then driving the sample plate 9 to slide. The reset member 152 is compressed to provide the reset force for the connecting rod 151.

[0042] Reference Figure 1 and Figure 5 An annular protrusion 23 is fixed to the outer wall of the end of the rotating rod 52 that extends beyond the sliding rod 51. A positioning plate 24 is rotatably connected to the outer wall of the annular protrusion 23. The positioning plate 24 is vertically arranged. A driving component 25 connected to the positioning plate 24 is installed on the bracket 10. The driving component 25 can be a cylinder, lead screw, linear telescopic cylinder, or other device. When it is necessary to drive the rotating rod 52 to slide in a straight line, it can be driven by the driving component 25 to drive the rotating rod 52 to slide more precisely. The side of the annular protrusion 23 facing the sliding rod 51 has a rough structure. When the sample plate 9 is pushed to the maximum distance, the annular protrusion 23 abuts against the end face of the sliding rod 51. Therefore, when the power source 53 drives the sliding rod 51 to rotate, it can synchronously drive the rotating rod 52 to rotate.

[0043] The power source 53 includes a motor 531 mounted on the bracket 10. A sprocket 532 is fixed on the output shaft of the motor 531. A synchronous chain 533 is connected between the sprocket 532 and the outer wall of the sliding rod 51. The motor 531 can drive the sliding rod 51 to rotate.

[0044] The implementation principle of a high-temperature tubular furnace according to an embodiment of this application is as follows: A sample is placed on a sample plate 9. After heat treatment for a period of time, the driving component 25 drives the rotating rod 52 to slide a certain distance closer to the rotating seat 8, causing the positioning ring 142 and the stepped surface 16 to separate. Then, the rotating rod 52 rotates 180 degrees, positioning the sample plate 9 above the receiving plate 7, causing the sample on the sample plate 9 to fall onto the receiving plate 7. Then, the driving component 25 drives the rotating rod 52 to continue sliding, causing the inner end face of the slot 21 to abut against the connecting rod 151, pushing the sample plate 9 to slide. The length of the sample plate 9 extending beyond the surface of the rotating seat 8 exceeds the length of the receiving plate 7. At this time, the annular protrusion 23 can press against the end face of the sliding rod 51. Then, the power source 53 drives the sliding rod 51 to rotate 180 degrees, and the rotating rod 52 can rotate synchronously. At this time, the receiving plate 7 is located above the sample plate 9, and the sample falls onto the sample plate 9. Then, the driving component 25 drives the rotating rod 52 to move back a certain distance, the annular protrusion 23 and the sliding rod 51 disengage, and the positioning ring 142 and the stepped surface 16 do not contact. Then, the sliding rod 51 rotates another 180 degrees, so that the receiving plate 7 is located below the sample plate 9 again. Then, the driving component 25 drives the rotating rod 52 to continue sliding and disengage from the positioning ring 142. The positioning ring 142 then presses against the stepped surface 16.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-temperature tube furnace, comprising a heating furnace body (1) and a furnace tube (2), one end of the furnace tube (2) is a sampling end (3), and the other end is a connecting end (4); characterized in that: Also include the turnover mechanism (5), the turnover mechanism (5) includes the sliding rod (51) slidingly connected to the connecting end (4), the rotating rod (52) rotatably arranged in the sliding rod (51) and the power source (53) for driving the sliding rod (51) rotation;The sliding rod (51) is provided with a connecting seat (6) at one end in the furnace tube (2), the connecting seat (6) is provided with a receiving plate (7), the connecting seat (6) is rotatably provided with a rotating seat (8), the rotating seat (8) is provided with a sample plate (9), the rotating rod (52) and the rotating seat (8) are connected, the receiving plate (7) and the sample plate (9) are both semicircular structure with opening upward, the receiving plate (7) and the sample plate (9) are concentrically arranged, and the outer wall of the sample plate (9) abuts on the inner wall of the receiving plate (7);The sample plate (9) is slidingly connected to the rotating seat (8) along the axial direction of the rotating seat (8), and the rotating rod (52) can drive the sample plate (9) to slide when sliding in the sliding rod (51); When the receiving plate (7) is located below the sample plate (9), the length of the receiving plate (7) is greater than the length of the sample plate (9), by driving the rotating rod (52) to rotate, the sample plate (9) can be moved above the receiving plate (7);The length of the sample plate (9) is greater than the length of the receiving plate (7) by sliding the rotating rod (52), the power source (53) drives the sliding rod (51) and the rotating rod (52) to rotate synchronously, so that the receiving plate (7) is located directly above the sample plate (9), then by rotating the sliding rod (51), the receiving plate (7) is located below the sample plate (9) again.

2. A high temperature tube furnace according to claim 1, characterized in that: The outer wall of the sliding rod (51) is rotatably provided with a support (10), the lower end of the support (10) is slidingly connected with a support plate (11), the support (10) is slidingly arranged on the support plate (11) in a direction parallel to the length direction of the furnace tube (2), and the power source (53) is installed on the support (10) and matched with the sliding rod (51).

3. A high temperature tube furnace according to claim 2, characterised in that: The connecting base (6) is provided with a containing groove (12), the rotating base (8) is rotatably connected in the containing groove (12), and a distance exists between the rotating base (8) and the inner end face of the containing groove (12). The rotating base (8) is coaxially provided with a connecting shaft (13), the connecting shaft (13) is rotatably arranged through the connecting base (6) and extends in the inner cavity of the sliding rod (51). The connecting shaft (13) is slidably inserted into one end of the rotating rod (52), and the rotating rod (52) is rotatably connected with the connecting shaft (13). The connecting shaft (13) is provided with a positioning piece (14) in the inner cavity of the sliding rod (51), the positioning piece (14) and the inner wall of the sliding rod (51) are matched to limit the rotation of the connecting shaft (13). The connecting shaft (13) is further provided with a connecting piece (15), the connecting piece (15) is connected with the sample plate (9), and when the rotating rod (52) slides towards the connecting shaft (13), the positioning effect of the positioning piece (14) on the connecting shaft (13) is first released, and then the sample plate (9) is slid away from the rotating base (8) through the connecting piece (15).

4. A high temperature tube furnace according to claim 3, characterised in that: The positioning piece (14) comprises a positioning ring (142) slidably sleeved on the outer wall of the connecting shaft (13) and an elastic piece (141) arranged on the outer wall of the connecting shaft (13). The inner wall of the sliding rod (51) is provided with a stepped surface (16), the elastic piece (141) can drive the positioning ring (142) to abut against the stepped surface (16), and the side of the positioning ring (142) and the stepped surface (16) abutting against each other is a rough structure. When the sliding rod (51) moves towards the connecting shaft (13), the positioning ring (142) can abut against the stepped surface (16) and drive the positioning ring (142) and the stepped surface (16) to separate from each other.

5. A high temperature tube furnace according to claim 4, characterised in that: The connecting shaft (13) is provided with a mounting cavity (17), the connecting piece (15) is a connecting rod (151) slidingly connected in the mounting cavity (17) and a reset piece (152) connected between the connecting rod (151) and the inner wall of the mounting cavity (17), the connecting shaft (13) is provided with a letting slot (18) in the side wall in the accommodating groove (12), and the letting slot (18) is communicated with the mounting cavity (17); the rotating seat (8) is provided with a sliding groove (19), the sample plate (9) is slidingly connected in the sliding groove (19), the sample plate (9) is provided with a supporting rod (20), the supporting rod (20) passes through the rotating seat (8) and extends in the mounting cavity (17) from the letting slot (18) and is connected with the connecting rod (151); one end of the sliding rod (51) is provided with a slot (21), the connecting shaft (13) is inserted into the slot (21), one end of the connecting rod (151) extends in the slot (21) from the end of the connecting shaft (13), when the sliding rod (51) slides towards the connecting shaft (13), the end surface of the slot (21) abuts against the end surface of the connecting rod (151) after the sliding rod (51) pushes the positioning ring (142) to separate from the stepped surface (16), the sliding rod (51) continues to slide and pushes the connecting rod (151) to slide, and the reset piece (152) is compressed.

6. A high temperature tube furnace according to claim 5, characterised in that: Both ends of the sample plate (9) are provided with inclined surfaces (22) extending to both sides.

7. A high temperature tube furnace according to claim 6, characterised in that: One end of the rotating rod (52) beyond the end of the sliding rod (51) is provided with a ring convex (23), the outer wall of the ring convex (23) is rotationally provided with a positioning plate (24), the bracket (10) is provided with a driving piece (25) connected with the positioning plate (24), the driving piece (25) is used for driving the rotating rod (52) to slide along the axis direction, and one end of the ring convex (23) towards the sliding rod (51) is a rough structure, when the sample plate (9) slides to the maximum distance, the ring convex (23) abuts against the end of the sliding rod (51).

8. A high temperature tube furnace according to claim 7, characterised in that: The outer wall of the connecting shaft (13) is provided with a guide block (26), and the inner wall of the slot (21) is provided with a guide groove (27) for sliding of the guide block (26).

9. A high temperature tube furnace according to claim 5, characterized in that: The power source (53) comprises a motor (531) mounted on the bracket (10), the output shaft of the motor (531) is provided with a chain wheel (532), and the outer wall of the sliding rod (51) is connected with the chain wheel (532) through a synchronous chain (533).

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