Optimized heat treatment device for high-temperature vacuum tube type muffle furnace

Abstract

The invention relates to the technical field of heat treatment, and discloses an optimized heat treatment device for a high-temperature vacuum tube type muffle furnace, which comprises a muffle furnace main body with an air inlet pipe and a cabin door, a clamp conveying mechanism and a sample clamp are arranged in an inner cavity of the muffle furnace main body, and by utilizing the chemical characteristics of the sample clamp, in the heating process, the sample clamp is conveyed to the muffle furnace main body; before the sample heat treatment temperature is reached, oxidation reaction with residual oxygen in the inner cavity of the muffle furnace main body can be carried out, and the residual oxygen in the muffle furnace main body is quickly consumed, so that the inner cavity of the muffle furnace main body can quickly reach a perfect vacuum environment, and the influence of the residual oxygen on the sample heat treatment is avoided; the end, located in the inner cavity of the muffle furnace body, of the gas inlet pipe is provided with the gas guide assembly, replacement gas introduced through the gas inlet pipe enters the inner cavity of the muffle furnace body in a divergent mode through the gas guide assembly, and therefore the phenomenon that an airflow shadow area exists in the inner cavity of the muffle furnace body is avoided, and the content of exhausted oxygen meets the requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment, and in particular to a high-temperature vacuum tube muffle furnace optimized heat treatment device. BACKGROUND

[0002] The current high-temperature vacuum tube muffle furnace (such as shown in the figure) uses the way of passing inert gas while exhausting to keep the pressure in the furnace stable during use in order to ensure the atmosphere environment of the heat treatment sample. The heating of the tube muffle furnace is usually four-sided, and the front and back are gas inlets and outlets. The gas outlet is usually designed to be larger to become a hatch for the convenience of putting in the sample. Figure 1

[0003] The existing high-temperature vacuum tube muffle furnace has the problem that the internal cavity cannot be guaranteed to be perfect vacuum due to the influence of residual oxygen in the high-temperature vacuum tube muffle furnace, and the vacuum time needs to be lengthened, thereby causing the problem of external air penetration.

[0004] Because the gas inlet of the gas inlet pipe is in the middle of the high-temperature vacuum tube muffle furnace, there is a gas flow shadow area in the direction of the flowing gas, which causes the problem that part of the gas in the high-temperature vacuum tube muffle furnace cannot be completely replaced and discharged, and the oxygen content of the discharged gas cannot meet the requirements. In view of the above problems existing in the prior art, the purpose of the present application is to provide a high-temperature vacuum tube muffle furnace optimized heat treatment device to solve the problem that the replacement gas has a shadow area during the process of being passed in, and the residual oxygen in the furnace body cannot be controlled to the target. SUMMARY

[0005] In view of the above problems existing in the prior art, the purpose of the present application is to provide a high-temperature vacuum tube muffle furnace optimized heat treatment device to solve the problem that the replacement gas has a shadow area during the process of being passed in, and the residual oxygen in the furnace body cannot be controlled to the target.

[0006] The present application adopts the following technical scheme: a high-temperature vacuum tube muffle furnace optimized heat treatment device, comprising a muffle furnace main body provided with a gas inlet pipe and a hatch, and an alumina plug is arranged at a position close to the hatch in the internal cavity of the muffle furnace main body, and a clamp conveying mechanism and a sample clamp are arranged in the internal cavity of the muffle furnace main body, and the clamp conveying mechanism and the sample clamp are made of an easily oxidizable metal material. The sample clamp comprises a clamp base, a plurality of groups of sample clamping plates and sample baffles are vertically and uniformly arranged on the top of the clamp base, and the sample baffles are arranged on the rear side of the plurality of groups of sample clamping plates, the sample is clamped and fixed on the top of the clamp base by the gaps between adjacent two groups of sample clamping plates and the gaps between the sample baffles and the adjacent sample clamping plates, a plurality of groups of air permeable holes are uniformly arranged in the side walls of the sample clamping plates and the sample baffles, a clamp slot is arranged on the top of the clamp base and located on the front side of the sample clamping plates. ​The clamp conveying mechanism is used for pushing the sample clamp with the sample into the deep part of the inner cavity of the muffle body and taking out the sample clamp with the sample from the deep part of the inner cavity of the muffle body. The air inlet pipe is provided with an air guide assembly at the end of the inner cavity of the muffle body, the air guide assembly comprises a flow divider, an air guide pipe and a connecting sleeve, the air guide pipe is transversely fixed at the middle part of the flow divider through the connecting sleeve, the connecting sleeve is communicated with the inner cavity of the air inlet pipe, and the displacement gas introduced through the air inlet pipe enters the inner cavity of the muffle body in a diverging manner by means of the flow divider and the air guide pipe.

[0007] As a further improvement of the above scheme, the clamp conveying mechanism comprises two groups of support sliding rails transversely installed at the bottom of the inner cavity of the muffle body, the top of the support sliding rails is provided with two groups of support sliding blocks capable of sliding, the top of the support sliding blocks is fixed with a support plate for placing the sample clamp, a driving assembly for driving the support plate to slide is arranged between the two groups of support sliding rails, and the top of the support plate is provided with clamp clamping blocks for fixing the sample clamp.

[0008] As a further improvement of the above scheme, the support sliding rail comprises a support base, and the support base is in a H-shaped structure, U-shaped notches are formed at the top of the support base, and a plurality of sliding rollers are uniformly installed at the top of the U-shaped notches.

[0009] As a further improvement of the above scheme, the support sliding block comprises a support sleeve sleeved at the top of the support base, two groups of fixing blocks are symmetrically fixed at the top of the support sleeve, and fixing screw holes are vertically formed at the top of the fixing blocks.

[0010] As a further improvement of the above scheme, a plurality of groups of positioning insertion holes for clamp clamping block installation and countersunk screw holes for connecting with the fixing screw holes are uniformly formed at the top of the support plate, and moving sliding blocks are symmetrically fixed at the bottom of the support plate.

[0011] As a further improvement of the above scheme, the driving assembly comprises two groups of support ear plates, a driving screw is transversely installed between the two groups of support ear plates, the moving sliding block is sleeved on the outer wall of the driving screw, the moving sliding block and the driving screw are threadedly matched with each other, wear-resistant bearings are installed at the connection positions of the support ear plates and the driving screw, and a wrench connecting rod is welded to one end of the driving screw close to the alumina plug.

[0012] As a further improvement of the above scheme, the clamp clamping block comprises a clamping block main body matched with the clamp clamping groove, and a positioning insertion rod matched with the positioning insertion hole is vertically fixed at the bottom of the clamping block main body.

[0013] As a further improvement of the above-mentioned scheme, the flow divider comprises a gas guide block, a gas pipe mounting hole is transversely arranged in the middle of the sidewall of the gas guide block, a plurality of groups of exhaust passages connected with the gas pipe mounting hole are uniformly arranged in the arc-shaped sidewall of the gas guide block, and a plurality of groups of positioning clamping grooves are arranged in the sidewall of the gas guide block and are circumferentially distributed relative to the gas pipe mounting hole.

[0014] As a further improvement of the above-mentioned scheme, the gas guide pipe comprises a communication pipe and a conical exhaust head, and the communication pipe and the conical exhaust head are fixed as an integral whole and are in communication with each other, a plurality of groups of shunt holes in communication with the exhaust passages are uniformly arranged in the sidewall of the communication pipe, an outer thread connected with the connecting sleeve is arranged on the end portion of the outer wall of the communication pipe away from the conical exhaust head, a plurality of groups of exhaust holes are uniformly arranged on the conical inclined surface of the conical exhaust head, and a positioning clamping block matched with the positioning clamping groove is arranged on the sidewall of the conical exhaust head.

[0015] As a further improvement of the above-mentioned scheme, the connecting sleeve comprises a connecting pipe, and the connecting pipe is sleeved on the outer wall of the communication pipe, one end of the connecting pipe is fixedly provided with a limiting pressing plate, the sidewall of the limiting pressing plate abuts against the sidewall of the gas guide block, an inner thread matched with the outer thread is arranged in the inner cavity of the connecting pipe close to the limiting pressing plate, and the sidewall of the end of the connecting pipe away from the limiting pressing plate is provided with a sealing thread connected with the air inlet pipe.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows: The present application utilizes the chemical properties of the sample clamp itself, and in the process of heating and warming up, the sample clamp can oxidize with the residual oxygen in the gas environment in the inner cavity of the muffle furnace main body before the sample heat treatment temperature is reached, quickly consume the residual oxygen in the inner cavity of the muffle furnace main body, so that the inner cavity of the muffle furnace main body can quickly reach a perfect vacuum environment, and the influence of residual oxygen on sample heat treatment is avoided. The sample clamp after oxidation can be repeatedly used by grinding off the surface oxide layer, and the sample clamp has the characteristics of uniform and fast heat conduction, which can make the clamped sample heat evenly, so that the heat treated sample is in the same temperature condition, and the consistency of the sample heat treatment effect is guaranteed. The present application utilizes the clamp conveying mechanism to push the sample clamp with the sample into the deep inner cavity of the muffle furnace main body, and take out the sample clamp with the sample from the deep inner cavity of the muffle furnace main body, avoiding the problem of scalding risk caused by the staff wearing anti-scald clothes and holding the sample clamp with the arm inserted into the inner cavity of the muffle furnace main body. The present application utilizes the flow divider and the gas guide pipe to make the replacement gas introduced through the air inlet pipe enter the inner cavity of the muffle furnace main body in a divergent form, so as to avoid the phenomenon of air flow shadow zone existing in the inner cavity of the muffle furnace main body, ensure that the gas in the inner cavity of the muffle furnace main body can be completely replaced and discharged, and realize that the discharged oxygen content reaches the requirement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The internal structure diagram of the existing high-temperature vacuum tube muffle furnace; Figure 2 The internal structure diagram of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 3 The three-dimensional display diagram of the clamp conveying mechanism of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 4 The enlarged view of A part of the clamp conveying mechanism of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 5 The enlarged view of B part of the clamp conveying mechanism of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 6 The three-dimensional display diagram of the support sliding block of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 7 The three-dimensional display diagram of the support plate of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 8 The three-dimensional display diagram of the support plate of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application in the upward direction; Figure 9 The three-dimensional display diagram of the clamp clamping block of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 10 The three-dimensional display diagram of the sample clamp of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 11 The three-dimensional display diagram of the gas guide assembly of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 12 The three-dimensional display diagram of the shunt of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 13 The three-dimensional display diagram of the gas guide pipe of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application; Figure 14 The three-dimensional display diagram of the connecting sleeve of the high-temperature vacuum tube muffle furnace optimized heat treatment device of the application.

[0018] Main symbol explanation: 1, muffle main body; 2, air inlet pipe; 3, hatch; 4, alumina plug; 5, clamp conveying mechanism; 51, supporting slide rail; 511, supporting base; 512, U-shaped notch; 513, sliding roller; 52, supporting sliding block; 521, supporting sliding sleeve; 522, fixing block; 523, fixing screw hole; 53, supporting plate; 531, positioning jack; 532, countersunk screw hole; 533, moving sliding block; 54, driving assembly; 541, supporting lug plate; 542, driving screw; 543, wear-resistant bearing; 544, wrench connecting rod; 55, clamp clamping block; 551, clamping block main body; 552, positioning plug; 6, sample clamp; 61, clamp base, 62, sample clamping plate; 63, sample baffle; 64, air-permeable hole; 65, clamp clamping groove; 7, air guide assembly; 71, flow divider; 711, air guide block, 712, air pipe mounting hole; 713, exhaust passage; 714, positioning clamping groove; 72, air guide pipe; 721, communication pipe; 722, conical exhaust head; 723, flow dividing hole; 724, external thread; 725, exhaust hole; 726, positioning clamping block; 73, connecting kit; 731, connecting pipe; 732, limiting pressing plate; 733, internal thread; 734, sealing thread. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings of the embodiments of the present disclosure.

[0020] Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present disclosure.

[0021] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meaning understood by those skilled in the art to which the present disclosure pertains. The similar words such as “comprise” or “contain” and the like used in the present disclosure mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects. The similar words such as “connect” or “connected” are not limited to physical or mechanical connection, but also include electrical connection, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to represent relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits the detailed description of known functions and known components.

[0023] Please combineFigures 2-14 As shown, the high-temperature vacuum tube muffle furnace optimized heat treatment device provided by the embodiment of the application comprises: a muffle furnace body 1 provided with an air inlet pipe 2 and a hatch 3, and an alumina plug 4 for heat preservation and sealing is arranged in the inner cavity of the muffle furnace body 1. In order to solve the problem that after the inner cavity of the muffle furnace body 1 is vacuumized to the limit by using a vacuum device, the perfect vacuum inside the muffle furnace body 1 cannot be guaranteed due to the influence of residual oxygen in the inner cavity of the muffle furnace body 1, and the vacuumization time needs to be lengthened, thereby causing the problem of penetration of external air, such as Figure 2 and Figure 10 As shown, a sample clamp 6 for placing samples is arranged in the inner cavity of the muffle furnace body 1 (the sample clamp 6 is made of an easily oxidizable metal material, for example, brass), wherein the sample clamp 6 comprises a clamp base 61, a plurality of groups of sample clamping plates 62 for placing samples are vertically and uniformly arranged on the top of the clamp base 61, the samples can be clamped and fixed on the top of the clamp base 61 by using the gap between adjacent two groups of sample clamping plates 62, a sample baffle 63 is vertically arranged on the rear side of the plurality of groups of sample clamping plates 62, and the height of the sample baffle 63 is higher than the height of the sample clamping plate 62, so that the gap between the sample baffle 63 and its adjacent sample clamping plate 62 can be used for clamping the sample with a higher height, and the sample clamp 6 has the characteristics of uniform and fast heat conduction, so that the clamped sample can be uniformly heated, the samples in heat treatment are in the same temperature condition, the consistency of the sample heat treatment effect is guaranteed, a plurality of groups of air permeable holes 64 are uniformly arranged in the side walls of the sample clamping plate 62 and the sample baffle 63, the plurality of groups of air permeable holes 64 can eliminate the vacuum dead angle in the sample clamp 6, and the sample clamp 6 itself has chemical properties, so that before the sample heat treatment temperature is reached in the process of heating and warming up (the oxidation temperature of brass is 200-350℃, and a significant oxidation peak appears at 350℃, a CuO layer is generated on the surface, and the sample heat treatment temperature needs to reach more than 500℃), the sample clamp 6 can have an oxidation reaction with the residual oxygen in the gas environment in the inner cavity of the muffle furnace body 1, and the residual oxygen in the inner cavity of the muffle furnace body 1 can be quickly consumed (the residual oxygen content can be reduced to below 0.01% within 10 minutes by using the brass sample clamp), so that the inner cavity of the muffle furnace body 1 can quickly reach a perfect vacuum environment, and the influence of residual oxygen on sample heat treatment is avoided, and the sample clamp 6 after oxidation can be repeatedly used by grinding off the oxidation layer on the surface; In order to solve the problem that the sample clamp 6 with samples is difficult to be placed and taken in the inner cavity of the muffle furnace body 1, the staff needs to wear an anti-scald suit and hold the sample clamp 6 with the arm to place or take out in the inner cavity of the muffle furnace body 1, and there is a risk of scalding in the process of placing or taking out, such as Figures 2-10As shown, the inner cavity of the muffle body 1 is provided with a clamp conveying mechanism 5 (the clamp conveying mechanism 5 is also made of brass) for conveying the sample clamp 6, wherein the clamp conveying mechanism 5 comprises two groups of supporting slide rails 51 which are symmetrically installed on the bottom of the muffle body 1 through bolts, the supporting slide rail 51 is a supporting base 511 of an I-shaped structure (the bottom of the supporting base 511 is provided with a threaded hole for fixation), a U-shaped notch 512 is formed on the top of the supporting base 511, two groups of slidable supporting blocks 52 are installed on the top of each group of supporting slide rails 51, a plurality of rolling rollers 513 are installed in the inner cavity of the U-shaped notch 512, the rolling characteristics of the rolling rollers 513 can reduce the abrasion of the supporting blocks 52 on the top of the supporting slide rails 51, the supporting block 52 comprises a supporting sleeve 521 matched with the supporting base 511, the supporting sleeve 521 is clamped on the top of the supporting base 511, two groups of fixing blocks 522 are symmetrically welded on the top of the supporting sleeve 521, vertical fixing screw holes 523 are formed on the top of the fixing blocks 522, supporting plates 53 for placing the sample clamp 6 are fixed on the top of the four groups of supporting blocks 52 through countersunk head bolts, movable sliding blocks 533 with threaded through holes are fixed on the bottom of the supporting plate 53 through screws, a driving assembly 54 for driving the supporting plate 53 to slide is transversely installed between the two groups of supporting slide rails 51, the driving assembly 54 comprises two groups of supporting ear plates 541 fixed on the bottom of the muffle body 1 through bolts, the two groups of supporting ear plates 541 are arranged on the transversely symmetrical shafts of the two groups of supporting slide rails 51, a driving screw 542 for driving is transversely installed between the two groups of supporting ear plates 541, the two groups of movable sliding blocks 533 are sleeved on the outside of the driving screw 542 and are matched with each other through internal and external threads, wear-resistant bearings 543 are installed at the connection between the driving screw 542 and the supporting ear plates 541, the rotation of the wear-resistant bearings 543 can reduce the abrasion at the connection between the driving screw 542 and the supporting ear plates 541, a wrench connecting rod 544 which can be connected with an electric wrench is welded on one end of the driving screw 542 close to the hatch 3, so that after the sample clamp 6 is placed on the top of the supporting plate 53, the wrench connecting rod 544 is connected with the electric wrench, the clockwise rotation of the wrench connecting rod 544 is driven by the rotation of the electric wrench, the rotation of the driving screw 542 is driven by the clockwise rotation of the wrench connecting rod 544, the supporting plate 53 with the sample clamp 6 slides to the deep part of the inner cavity of the muffle body 1 through the clockwise rotation of the driving screw 542 and the threaded action between the driving screw 542 and the movable sliding block 533, at the same time, the supporting plate 53 slides, driving the supporting blocks 52 to slide on the top of the supporting slide rails 51, the sliding of the supporting blocks 52 on the supporting slide rails 51 can stably convey the sample clamp 6 to the deep part of the inner cavity of the muffle body 1,Only need to drive the wrench connecting rod 544 counterclockwise by electric wrench, convenient to take and place the sample clamp 6 with sample in the inner cavity of the muffle furnace main body 1, thereby avoiding the problem of the risk of scalding caused by the staff wearing anti-scald clothes and holding the sample clamp 6 to put the arm into the inner cavity of the muffle furnace main body 1, In order to be able to flexibly adjust the fixed position of the sample clamp 6 on the top of the support plate 53, as shown in Figure 2 、 3 7, 9 and 10, a clamp clamping groove 65 is opened at the top of the clamp base 61, and the clamp clamping groove 65 is arranged on the front side of the sample clamp plate 62. A plurality of positioning insertion holes 531 are uniformly arranged on the top of the support plate 53. Symmetrical countersunk screw holes 532 matched with the fixed screw holes 523 are arranged on the top of the support plate 53, thereby facilitating the connection of the countersunk head bolt passing through the inner cavity of the countersunk head screw hole 532 and the fixed screw hole 523, fixing the support sliding block 52 on the bottom of the support plate 53. The clamp clamping block 55 for fixing the sample clamp 6 is inserted on the top of the support plate 53. The clamp clamping block 55 includes a clamping block body 551 matched with the clamp clamping groove 65, and the clamp clamping groove 65 can be sleeved outside the clamping block body 551, thereby fixing the sample clamp 6 on the top of the support plate 53. Symmetrical positioning insertion rods 552 matched with the positioning insertion holes 531 are welded on the bottom of the clamping block body 551. The position of the clamping block body 551 on the top of the support plate 53 can be adjusted by adjusting the position of the positioning insertion rod 552 in the positioning insertion hole 531 on the top of the support plate 53, thereby flexibly adjusting the fixed position of the sample clamp 6 on the top of the support plate 53 when the clamp clamping groove 65 is sleeved outside the clamping block body 551; In order to solve the problem that due to the air inlet of the air inlet pipe 2 in the middle of the muffle furnace main body 1, the replacement gas (the replacement gas is inert gas, such as nitrogen, argon, etc.) entering the gas flow shadow area along the gas flow direction, resulting in that part of the gas in the muffle furnace main body 1 cannot be completely replaced and discharged, and the oxygen content of the discharged gas cannot meet the requirements, as shown in Figure 2 and Figures 11-14As shown, the end of the air inlet pipe 2 located in the inner cavity of the muffle body 1 is provided with a gas guide assembly 7 for dispersing the replacement gas, wherein the gas guide assembly 7 comprises a flow divider 71, a gas guide pipe 72 and a connecting sleeve 73 (the flow divider 71 is made of high-temperature-resistant ceramic, and the gas guide pipe 72 and the connecting sleeve 73 are made of brass), the flow divider 71 comprises a gas guide block 711 provided with a gas pipe mounting hole 712, the gas pipe mounting hole 712 is transversely arranged in the middle of the gas guide block 711, a plurality of groups of exhaust passages 713 are uniformly arranged on the arc-shaped side wall of the gas guide block 711, and the exhaust passages 713 are in communication with the inner cavity of the gas pipe mounting hole 712, a plurality of groups of positioning clamping grooves 714 for positioning are arranged on the vertical side wall of the gas guide block 711, and the plurality of groups of positioning clamping grooves 714 are uniformly distributed around the gas pipe mounting hole 712, the gas guide pipe 72 comprises a communication pipe 721 and a conical exhaust head 722, the communication pipe 721 is transversely arranged in the inner cavity of the gas pipe mounting hole 712, a plurality of groups of flow dividing holes 723 matched with the exhaust passages 713 are uniformly arranged on the side wall of the communication pipe 721, the communication pipe 721 and the conical exhaust head 722 are fixedly connected and in communication through welding, when the communication pipe 721 is arranged in the inner cavity of the gas pipe mounting hole 712, the plurality of groups of flow dividing holes 723 are in communication with the plurality of groups of exhaust passages 713, an external thread 724 for fixing connection is arranged on the outer wall of the end of the communication pipe 721 away from the conical exhaust head 722, a plurality of groups of exhaust holes 725 for exhaust are uniformly arranged on the conical slope of the conical exhaust head 722, a plurality of groups of positioning clamping blocks 726 matched with the positioning clamping grooves 714 are uniformly arranged on the vertical side wall of the conical exhaust head 722, and the plurality of groups of positioning clamping blocks 726 are circumferentially and uniformly distributed about the communication pipe 721, the connecting sleeve 73 comprises a connecting pipe 731 capable of being sleeved on the outer wall of the communication pipe 721 and a limiting pressing plate 732 abutting against the side wall of the gas guide block 711, and the limiting pressing plate 732 is welded on one end of the connecting pipe 731, an inner thread 733 matched with the external thread 724 is arranged in the inner cavity of the end of the connecting pipe 731 close to the limiting pressing plate 732, and a sealing thread 734 connected with the air inlet pipe 2 is arranged on the side wall of the end of the connecting pipe 731 away from the limiting pressing plate 732, the end of the communication pipe 721 away from the conical exhaust head 722 is inserted into the inner cavity of the gas pipe mounting hole 712, the flow dividing holes 723 are communicated with the exhaust passages 713 under the positioning of the positioning clamping blocks 726 in the positioning clamping grooves 714, the connecting pipe 731 is fixedly arranged on the end of the communication pipe 721 under the cooperation of the inner thread 733 and the external thread 724, and the limiting pressing plate 732 abuts and presses against the side wall of the gas guide block 711, by screwing the end of the connecting pipe 731 provided with the sealing thread 734 to the end of the air outlet of the air inlet pipe 2, when the replacement gas in the air inlet pipe 2 flows in, it can enter the inner cavity of the muffle body 1 in a divergent manner through the gas guide block 711 and the exhaust holes 725, thereby avoiding the phenomenon that there is a gas flow shadow area in the inner cavity of the muffle body 1,Ensure that the gas inside the muffle body 1 can be completely replaced and discharged, and the oxygen content discharged can meet the requirements.

[0024] The specific process of the present scheme for sample heat treatment is as follows: ① Put the sample to be heat treated vertically on the sample clamp 6, place the sample clamp 6 with the sample on the top of the support plate 53, and fix the sample clamp 6 with the sample on the top of the support plate 53 by sleeving the clamp slot 65 to the outside of the clamping block body 551. The driving end of the electric wrench is sleeved to the end of the electric wrench 544, the clockwise rotation of the wrench connecting rod 544 is driven by the rotation of the driving end of the electric wrench 554, the clockwise rotation of the driving screw 542 is driven by the clockwise rotation of the wrench connecting rod 544, and the support plate 53 with the sample clamp 6 is slid to the deep cavity of the muffle body 1 by the clockwise rotation of the driving screw 542 and the threaded action between the driving screw 542 and the moving slider 533. At the same time, the support slider 52 slides on the top of the support rail 51 during the sliding of the support plate 53, and the support slider 52 is pushed to the deep cavity of the muffle body 1 by sliding on the support rail 51, so that the alumina plug 4 and the front panel are flush, the hatch 3 is installed and closed tightly; ② Open the air inlet of the air inlet pipe 2, connect the vacuum hose to the air inlet end of the air inlet pipe 2, and start the vacuum pump to start vacuumizing; ③ While vacuumizing, press the RUN button 3s on the muffle body 1, the RUN indicator green light is on, start vacuumizing and heating at the same time, and heat to about 250℃ (exhaust residual gas adsorbed in the cavity, there is almost no gas in the cavity during the heating process, which will not cause high temperature problem of the vacuum pump); ④ When the temperature reaches 250℃, close the air inlet of the air inlet pipe 2, close the vacuum pump, and pull out the vacuum hose. Open the nitrogen cylinder and connect the outlet of the nitrogen cylinder to the air inlet of the air inlet pipe 2. Adjust the pressure to 0.1Mpa.

[0025] ⑤ Slowly open the air inlet of the air inlet pipe 2, so that the nitrogen can enter the inner cavity of the muffle body 1 in the form of dispersion through the air guide assembly 7, avoid the phenomenon of air flow shadow zone in the inner cavity of the muffle body 1, and observe the air pressure reading of the muffle body 1 at the same time. The reading rises at a rate of about 0.01Mpa / 2s (about 20s to reach atmospheric pressure), until the cavity pressure gauge reading reaches 0.15Mpa. Slowly open the air outlet, and the pressure gauge reading increases slowly at this time. Control the size of the air outlet to keep the internal pressure of the cavity at about 0.14Mpa, and achieve the balance of air inlet and outlet (replace the residual gas in the muffle body 1).

[0026] ⑥In the process of air balance, the heating temperature is gradually rising, and the air inlet of the air inlet pipe 2 is opened and closed from time to time, which destroys the air flow condition formed in the main body 1 of the muffle furnace, improves the air exchange effect, and is expected to rise to 350℃ before other operations are performed. The approximate time is 10 minutes.

[0027] ⑦When the air inlet of the air inlet pipe 2 is closed at 350℃, the cavity surface pressure is about 0.04Mpa. Close the gas cylinder and wait for the temperature in the main body 1 of the muffle furnace to rise to 500℃, and continue heating for about 30 minutes to realize the heat treatment of the sample; ⑧After the heat treatment is completed, the main body 1 of the muffle furnace is closed, so that the sample can be naturally cooled in the inner cavity of the main body 1 of the muffle furnace, and the air inlet of the air inlet pipe 2 is opened to continue to introduce nitrogen to protect the sample. When the sample cooling is completed, the air inlet of the air inlet pipe 2 is closed, the hatch 3 is opened, the alumina plug 4 is removed, and the rotation of the wrench connecting rod 544 is driven counterclockwise by the electric wrench to make the sample clamp 6 with the sample be transported to the hatch 3 of the main body 1 of the muffle furnace. The worker takes out the sample clamp 6 with the sample from the inner cavity of the main body 1 of the muffle furnace. Next time, the sample clamp 6 needs to be polished before use.

[0028] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A high-temperature vacuum tube muffle furnace optimized heat treatment device, comprising a muffle furnace body (1) with an air inlet pipe (2) and a hatch (3), and an alumina plug (4) is arranged at a position close to the hatch (3) in the inner cavity of the muffle furnace body (1); the inner cavity of the muffle furnace body (1) is provided with a clamp conveying mechanism (5) and a sample clamp (6), and the clamp conveying mechanism (5) and the sample clamp (6) are made of an easily oxidizable metal material. wherein The sample clamp (6) comprises a clamp base (61), a plurality of groups of sample clamping plates (62) and sample baffles (63) are uniformly arranged vertically on the top of the clamp base (61), the sample baffles (63) are arranged on the rear side of the plurality of groups of sample clamping plates (62), and the sample is clamped and fixed on the top of the clamp base (61) by the gaps between adjacent two groups of sample clamping plates (62) and the gap between the sample baffle (63) and its adjacent sample clamping plate (62); a plurality of groups of air permeable holes (64) are uniformly arranged in the side walls of the sample clamping plate (62) and the sample baffle (63); a clamp clamping groove (65) is arranged on the top of the clamp base (61) and located on the front side of the sample clamping plate (62). The clamp conveying mechanism (5) is used for pushing the sample clamp (6) with samples into the deep part of the inner cavity of the muffle furnace body (1) and taking out the sample clamp (6) with samples from the deep part of the inner cavity of the muffle furnace body (1).

2. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 1, wherein, The clamp conveying mechanism (5) comprises two groups of support sliding rails (51) transversely arranged on the bottom of the inner cavity of the muffle furnace body (1), two groups of support sliding blocks (52) are arranged on the top of the support sliding rails (51), a support plate (53) for placing the sample clamp (6) is fixed on the top of the support sliding block (52), a driving assembly (54) for driving the support plate (53) to slide is arranged between the two groups of support sliding rails (51), and a clamp clamping block (55) for fixing the sample clamp (6) is arranged on the top of the support plate (53).

3. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 2, wherein, The support sliding rail (51) comprises a support base (511) in a H-shaped structure, and a U-shaped notch (512) is arranged on the top of the support base (511); and a plurality of sliding rollers (513) are uniformly arranged on the top of the U-shaped notch (512).

4. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 3, wherein, The support sliding block (52) comprises a support sleeve (521) sleeved on the top of the support base (511), two groups of fixing blocks (522) are symmetrically fixed on the top of the support sleeve (521), and a fixing screw hole (523) is vertically arranged on the top of the fixing block (522).

5. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 4, wherein, A plurality of groups of positioning insertion holes (531) for fixing the clamp clamping block (55) and a countersunk screw hole (532) for connecting with the fixing screw hole (523) are uniformly arranged on the top of the support plate (53); and a moving sliding block (533) is symmetrically fixed on the bottom of the support plate (53).

6. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 5, wherein, The driving assembly (54) comprises two groups of supporting lugs (541), a driving screw (542) is transversely arranged between the two groups of supporting lugs (541), and a moving slider (533) is sleeved on the outer wall of the driving screw (542); the moving slider (533) and the driving screw (542) are threadedly connected with each other; the supporting lug (541) is provided with a wear-resistant bearing (543) at the connecting position with the driving screw (542); and a spanner connecting rod (544) is welded to the end of the driving screw (542) close to the alumina plug (4).

7. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 5, wherein, The clamp clamping block (55) comprises a clamping block body (551) matched with the clamp clamping groove (65), and a positioning plug rod (552) matched with the positioning insertion hole (531) is vertically arranged at the bottom of the clamping block body (551).

8. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 1, wherein, The air inlet pipe (2) is provided with an air guide assembly (7) at the end of the inner cavity of the muffle main body (1); the air guide assembly (7) comprises a flow dividing piece (71), an air guide pipe piece (72) and a connecting sleeve piece (73); the air guide pipe piece (72) is transversely fixed to the middle part of the flow dividing piece (71) through the connecting sleeve piece (73); the connecting sleeve piece (73) is communicated with the inner cavity of the air inlet pipe (2); the flow dividing piece (71) and the air guide pipe piece (72) are used to make the replacement gas entering through the air inlet pipe (2) enter the inner cavity of the muffle main body (1) in a diverging manner; The flow dividing piece (71) comprises an air guide block (711), a gas pipe mounting hole (712) is transversely arranged in the middle part of the sidewall of the air guide block (711), a plurality of air exhaust channels (713) connected with the gas pipe mounting hole (712) are uniformly arranged on the arc-shaped sidewall of the air guide block (711), and a plurality of positioning clamping grooves (714) are arranged on the sidewall of the air guide block (711) and are circumferentially distributed about the gas pipe mounting hole (712).

9. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 8, wherein, The air guide pipe piece (72) comprises a communication pipe (721) and a conical air exhaust head (722), and the communication pipe (721) and the conical air exhaust head (722) are fixed as an integral whole and are in communication with each other; a plurality of flow dividing holes (723) in communication with the air exhaust channels (713) are uniformly arranged on the sidewall of the communication pipe (721); an external thread (724) connected with the connecting sleeve piece (73) is arranged on the end portion of the outer wall of the communication pipe (721) away from the conical air exhaust head (722); a plurality of air exhaust holes (725) are uniformly arranged on the conical inclined surface of the conical air exhaust head (722); and a positioning clamping block (726) matched with the positioning clamping groove (714) is arranged on the sidewall of the conical air exhaust head (722).

10. The high temperature vacuum tube furnace optimized heat treatment apparatus of claim 9, wherein, The connecting kit (73) comprises a connecting pipe (731), which is sleeved on the outer wall of the communicating pipe (721), one end of the connecting pipe (731) is fixedly connected with a limiting pressing plate (732), the side wall of the limiting pressing plate (732) is in abutment with the side wall of the air guide block (711), the inner cavity of the connecting pipe (731) close to the limiting pressing plate (732) is provided with an inner thread (733) matched with the outer thread (724), and the side wall of the other end of the connecting pipe (731) away from the limiting pressing plate (732) is provided with a sealing thread (734) connected with the air inlet pipe (2).

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