Powder metallurgy sintering furnace

Abstract

This invention relates to the field of powder metallurgy sintering furnace equipment technology, and discloses a powder metallurgy sintering furnace, including a rotating shaft, a rotating frame fixedly connected to the end of the rotating shaft, a slide rail fixedly connected to the surface of a support plate, a placement frame provided on the surface of the slide rail, and a force-bearing inclined block fixedly connected to the side of the support plate away from the slide rail. This invention, through the setting of a rotating mechanism, causes the driven column to rotate when the rotating ring rotates, and simultaneously causes the support plate to rotate through the driven column. When the support plate rotates, it causes the slide rail and placement frame to rotate, and when the placement frame rotates, it causes the powder forming material to rotate. During the rotation of the powder forming material, because heating holes are opened on the surfaces of the placement frame and the contact frame, the powder forming material can be heated more evenly during rotation, effectively heating the powder forming material during rotation, ensuring uniform heating, and thus improving the sintering quality of the powder forming material.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy sintering furnace equipment technology, specifically to a powder metallurgy sintering furnace. Background Technology

[0002] A powder metallurgy sintering furnace is a heat treatment device that uses metal powder (or a mixture of metal powder and non-metal powder) as raw material to press and form the powder into a whole through sintering. Powder metallurgy technology has been widely used in transportation, machinery, electronics, aerospace, weaponry, biology, new energy, information and nuclear industries, and has become one of the most dynamic branches of new materials science. Powder metallurgy technology has significant advantages such as energy saving, material saving and high product precision.

[0003] In the process of heating the pressed powder raw material in the existing powder metallurgy sintering furnace, the bottom of the raw material may come into contact with the surface of the placement rack, which may cause uneven heating of the bottom of the raw material during sintering, thus affecting the quality of powder metallurgy sintering. Summary of the Invention

[0004] The purpose of this invention is to provide a powder metallurgy sintering furnace to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a powder metallurgy sintering furnace, comprising a furnace body, a sealing door rotatably connected to one end of the furnace body, electric push rods fixedly connected to both sides of the furnace body, a heating device fixedly connected to the upper surface of the furnace body, and a motor fixedly connected to the end of the furnace body away from the sealing door; and further comprising:

[0007] A fixing mechanism, the fixing mechanism including a U-shaped ring frame, a limiting telescopic rod fixedly connected to the bottom of the U-shaped ring frame, and a contact frame fixedly connected to the bottom of the limiting telescopic rod;

[0008] A limiting mechanism, the limiting mechanism including a bent rod, the end of which is fixedly connected to a right-angle limiting plate;

[0009] A rotating mechanism, comprising a rotating ring, wherein a driven column is fixedly connected to the inner wall of the rotating ring, and a support plate is fixedly connected to the end of the driven column away from the rotating ring.

[0010] Furthermore, the number of electric push rods is provided in two, and the two electric push rods are symmetrically arranged with the furnace body as the center. The furnace body has two annular sliding grooves inside. The two annular sliding grooves are symmetrically arranged on the inner wall of the furnace body.

[0011] Furthermore, the fixing mechanism includes a grooved ring, an annular slider is slidably connected to the inner wall of the grooved ring, a telescopic plate is fixedly connected to the surface of the annular slider, a pressing plate is fixedly connected to the upper surface of the annular slider, an elastic plate is fixedly connected to the end of the pressing plate away from the annular slider, and a lower pressure plate is fixedly connected to the surface of the elastic plate.

[0012] Furthermore, the electric push rod is located near one end of the grooved ring and is fixedly connected to the surface of the grooved ring through the surface of the furnace body. The end of the lower pressure plate away from the elastic plate is fixedly connected to the surface of the U-shaped ring frame. There are two U-shaped ring frames, which are symmetrically arranged with the grooved ring as the center.

[0013] Furthermore, the limiting mechanism includes a curved telescopic plate, a limiting plate is fixedly connected to the end of the curved telescopic plate, curved frames are fixedly connected to both ends of the limiting plate, and a return spring is fixedly connected to the surface of the curved telescopic plate.

[0014] Furthermore, the end of the curved telescopic plate away from the curved telescopic plate is fixedly connected to the top of the U-shaped ring frame. The number of right-angle limiting plates is set to four, and they are divided into two groups of two. The four right-angle limiting plates are symmetrically arranged with the groove ring as the center. The end of the curved rod away from the right-angle limiting plate is fixedly connected to both sides of the curved telescopic plate.

[0015] Furthermore, the rotating mechanism includes a rotating shaft, a rotating frame is fixedly connected to the end of the rotating shaft, a slide rail is fixedly connected to the surface of the support plate, a placement rack is provided on the surface of the slide rail, and a force-bearing inclined block is fixedly connected to the side of the support plate away from the slide rail.

[0016] Furthermore, the end of the rotating shaft is fixedly connected to the output end of the motor, both ends of the rotating frame are fixedly connected to the inner wall of the rotating ring, the surface of the rotating ring is slidably connected to the inner wall of the annular groove, the surface of the support plate is provided with a groove, the end of the curved frame is in contact with the surface of the force-bearing inclined block, the end of the limiting telescopic rod away from the U-shaped ring frame is fixedly connected to the inner wall of the groove, both ends of the U-shaped ring frame are slidably connected to the inner wall of the groove, the surfaces of the contact frame and the placement frame are both provided with heating holes, the two sides of the placement frame are provided with moving grooves, and the surface of the slide rail is slidably connected to the inner wall of the moving groove.

[0017] The present invention has the following beneficial effects:

[0018] This invention employs a fixing mechanism. First, the placement frame is pulled out. Then, the powder molding material to be heated is placed inside the placement frame. The placement frame is then pushed back to its original position. Next, an electric push rod is activated to move the grooved rings closer together. As the grooved rings move, they cause the annular sliders to move closer together. When the annular sliders move, they push the telescopic plates to retract closer together. Simultaneously, the annular sliders push the extrusion plates closer together, and the extrusion plates then compress the elastic plate. When the elastic plate is compressed, its middle section bends. This bending pushes the lower pressure plate downwards. The downward movement of the lower pressure plate then drives the U-shaped ring frame. The U-shaped ring slides downwards along the inner wall of the groove. As it moves downwards, it pushes the contact frame downwards, bringing it into contact with the top of the powder molding material. Simultaneously, the U-shaped ring presses against the limiting telescopic rod. When the limiting telescopic rod is pressed, it retracts downwards, and upon reaching its final position, it limits the U-shaped ring, ensuring slight contact between the contact frame and the powder molding material. This prevents damage to the powder molding material and effectively secures it, preventing it from moving during rotation. The limiting telescopic rod also limits the U-shaped ring, preventing excessive contact and damage.

[0019] This invention utilizes a limiting mechanism. As the U-shaped ring slides downwards, it drives the curved telescopic plate downwards. This movement of the curved telescopic plate pushes the limiting plate downwards, which in turn drives the curved frame downwards. As the curved frame moves, it contacts the force-bearing inclined block. During this contact and movement, the curved frame pulls the limiting plate closer together, thus limiting both ends of the powder forming material. Simultaneously, the limiting plate pushes the curved telescopic plate to retract closer together. As the curved telescopic plate moves downwards, it drives the curved rod downwards. This movement of the curved rod drives the right-angle limiting plate downwards, contacting both ends of the slide rail and the moving groove. This effectively limits the displacement of the slide rail during rotation. Furthermore, the right-angle limiting plate also limits the ends of the slide rail and the moving groove, preventing deviation during rotation.

[0020] This invention employs a rotating mechanism. When the raw material is placed on the inner wall of the placement rack, the powder forming material is omnidirectionally limited by the contact rack and the limiting plate. At this point, the heating device is activated to heat the interior of the furnace. Then, the motor is started to drive the rotating shaft to rotate. When the rotating shaft rotates, it drives the rotating rack to rotate. When the rotating rack rotates, it drives the rotating ring to rotate on the inner wall of the annular groove. When the rotating ring rotates, it drives the driven column to rotate. Simultaneously, the driven column drives the support plate to rotate. When the support plate rotates, it drives the slide rail and the placement rack to rotate. When the placement rack rotates, it drives the powder forming material to rotate. During the rotation of the powder forming material, because the surfaces of the placement rack and the contact rack are provided with heating holes, the powder forming material can be heated more evenly during rotation, effectively heating the powder forming material during rotation and ensuring uniform heating, thereby improving the sintering quality of the powder forming material.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the fixing mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the limiting telescopic rod structure of the present invention;

[0027] Figure 5 For the present invention Figure 4 A magnified structural diagram of part A in the diagram;

[0028] Figure 6 This is a schematic diagram of the overall structure of the limiting mechanism of the present invention;

[0029] Figure 7 This is a schematic diagram of the reset spring structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the overall structure of the rotating mechanism of the present invention;

[0031] Figure 9This is a schematic diagram of the slide rail structure of the present invention.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] In the diagram: 1. Furnace body; 2. Sealed door; 3. Electric push rod; 4. Heating device; 5. Motor; 10. Fixing mechanism; 11. Grooved ring; 12. Ring-shaped slider; 13. Telescopic plate; 14. Extrusion plate; 15. Elastic plate; 16. Lower pressure plate; 17. U-shaped ring frame; 18. Limiting telescopic rod; 19. Contact frame; 30. Limiting mechanism; 31. Curved telescopic plate; 32. Limiting plate; 33. Curved frame; 34. Bending rod; 35. Right-angle limiting plate; 36. Return spring; 37. Force-bearing inclined block; 50. Rotating mechanism; 51. Rotating shaft; 52. Rotating frame; 53. Rotating ring; 54. Driven column; 55. Support plate; 56. Slide rail; 57. Placement rack. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-9 As shown, the present invention is a powder metallurgy sintering furnace, including a furnace body 1, a sealing door 2 rotatably connected to the end of the furnace body 1, electric push rods 3 fixedly connected to both sides of the furnace body 1, a heating device 4 fixedly connected to the upper surface of the furnace body 1, and a motor 5 fixedly connected to the end of the furnace body 1 away from the sealing door 2, and also includes;

[0036] The fixing mechanism 10 includes a U-shaped ring frame 17. When the pressure plate 16 moves downward, it will drive the U-shaped ring frame 17 to slide downward on the inner wall of the groove. The bottom of the U-shaped ring frame 17 is fixedly connected to a limiting telescopic rod 18. The bottom of the limiting telescopic rod 18 is fixedly connected to a contact frame 19. When the U-shaped ring frame 17 moves downward, it will push the contact frame 19 to move downward. When the contact frame 19 moves, it will contact the top of the powder molding material.

[0037] The limiting mechanism 30 includes a bent rod 34. When the bent telescopic plate 31 moves downward, it will drive the bent rod 34 to move downward. The end of the bent rod 34 is fixedly connected to a right-angle limiting plate 35. When the bent rod 34 moves, it will drive the right-angle limiting plate 35 to move downward and contact the two ends of the slide rail 56 and the moving groove, thereby preventing the slide rail 56 from displacing during rotation.

[0038] The rotating mechanism 50 includes a rotating ring 53. When the rotating frame 52 rotates, it will drive the rotating ring 53 to rotate on the inner wall of the annular groove. A driven column 54 is fixedly connected to the inner wall of the rotating ring 53. A support plate 55 is fixedly connected to the end of the driven column 54 away from the rotating ring 53. When the rotating ring 53 rotates, it will drive the driven column 54 to rotate, and at the same time, the driven column 54 will drive the support plate 55 to rotate.

[0039] There are two electric push rods 3, which are symmetrically arranged around the furnace body 1. The furnace body 1 has two annular grooves inside. The two annular grooves are symmetrically arranged on the inner wall of the furnace body 1.

[0040] The fixing mechanism 10 includes a grooved ring 11. First, the placement frame 57 is pulled out, then the powder molding material to be heated is placed inside the placement frame 57, and then the placement frame 57 is pushed back to its original position. Then, the electric push rod 3 is activated to push the grooved ring 11 to move in a direction closer to each other. An annular slider 12 is slidably connected to the inner wall of the grooved ring 11. When the grooved ring 11 moves, it will drive the annular slider 12 to move in a direction closer to each other. A telescopic plate 13 is fixedly connected to the surface of the annular slider 12. When the annular slider 12 moves, it will push the telescopic plate 13 to retract in a direction closer to each other. The upper surface of the annular slider 12... An extrusion plate 14 is fixedly connected to the surface of the U-shaped ring frame 17. The extrusion plate 14 is pushed to move closer to each other by the ring slider 12. An elastic plate 15 is fixedly connected to the end of the extrusion plate 14 away from the ring slider 12. A lower pressure plate 16 is fixedly connected to the surface of the elastic plate 15. When the middle part of the elastic plate 15 bends, it will push the lower pressure plate 16 to move downward. The powder molding material is effectively fixed by the contact frame 19, so that the powder molding material cannot move when rotating. At the same time, the U-shaped ring frame 17 is limited by the limiting telescopic rod 18, thereby preventing the contact frame 19 from contacting the powder molding material too heavily and causing damage.

[0041] The electric push rod 3 is located near one end of the grooved ring 11 and is fixedly connected to the surface of the grooved ring 11 through the surface of the furnace body 1. The end of the lower pressure plate 16 away from the elastic plate 15 is fixedly connected to the surface of the U-shaped ring frame 17. The elastic plate 15 is then pressed by the extrusion plate 14. When the elastic plate 15 is pressed, the middle part will bend. There are two U-shaped ring frames 17, which are symmetrically arranged with the grooved ring 11 as the center. When the U-shaped ring frame 17 moves downward, it will press the limiting telescopic rod 18. When the limiting telescopic rod 18 is pressed, it will retract downward, and when it retracts to the end, it will limit the U-shaped ring frame 17, so that the contact frame 19 makes slight contact with the powder forming material, preventing the contact frame 19 from damaging the powder forming material.

[0042] The limiting mechanism 30 includes a curved telescopic plate 31. When the U-shaped ring frame 17 slides downward, it will drive the curved telescopic plate 31 to move downward. The end of the curved telescopic plate 31 is fixedly connected to a limiting plate 32. When the curved telescopic plate 31 moves, it will push the limiting plate 32 to move downward. During the process of the curved frame 33 contacting and moving with the force-bearing inclined block 37, it will pull the limiting plate 32 to move towards each other, thereby limiting both ends of the powder molding material. The two ends of the limiting plate 32 are fixedly connected to the curved frame 33. When the limiting plate 32 moves downward, it will drive the curved frame 33 to move downward. The surface of the curved telescopic plate 31 is fixedly connected to a return spring 36. The limiting plate 32 effectively limits both ends of the powder molding material. At the same time, the right-angle limiting plate 35 limits both ends of the slide rail 56 and the moving groove to prevent deviation during rotation.

[0043] The end of the curved telescopic plate 31 away from the curved telescopic plate 31 is fixedly connected to the top of the U-shaped ring frame 17. At this time, the limiting plate 32 will push the curved telescopic plate 31 to retract in the direction of mutual approach during the movement. There are four right-angle limiting plates 35, which are divided into two groups of two. The four right-angle limiting plates 35 are symmetrically arranged with the groove ring 11 as the center. The end of the curved rod 34 away from the right-angle limiting plate 35 is fixedly connected to both sides of the curved telescopic plate 31.

[0044] The rotating mechanism 50 includes a rotating shaft 51. When the raw material is placed on the inner wall of the placement rack 57, the powder forming raw material is also omnidirectionally limited by the contact rack 19 and the limiting plate 32. At this time, the heating device 4 is started to heat the inside of the furnace body 1, and then the motor 5 is started to drive the rotating shaft 51 to rotate. The end of the rotating shaft 51 is fixedly connected to the rotating rack 52. The surface of the support plate 55 is fixedly connected to the slide rail 56, and the surface of the slide rail 56 is provided with the placement rack 57. When the support plate 55 rotates, it will drive the slide rail 56 and the placement rack 57 to rotate. The side of the support plate 55 away from the slide rail 56 is fixedly connected to the force-bearing inclined block 37. When the curved frame 33 moves, it will contact the force-bearing inclined block 37, effectively heating the powder forming raw material during the rotation process, making the powder forming raw material heat evenly, thereby improving the sintering quality of the powder forming raw material.

[0045] The end of the rotating shaft 51 is fixedly connected to the output end of the motor 5, and the two ends of the rotating frame 52 are fixedly connected to the inner wall of the rotating ring 53. When the rotating shaft 51 rotates, it will drive the rotating frame 52 to rotate. The surface of the rotating ring 53 is slidably connected to the inner wall of the annular groove. The surface of the support plate 55 is provided with a groove. The end of the curved frame 33 is in contact with the surface of the force-bearing inclined block 37. The end of the limiting telescopic rod 18 away from the U-shaped ring frame 17 is fixedly connected to the inner wall of the groove. The two ends of the U-shaped ring frame 17 are slidably connected to the inner wall of the groove. The surfaces of the contact frame 19 and the placement frame 57 are provided with heating holes. The two sides of the placement frame 57 are provided with moving grooves. When the placement frame 57 rotates, it will drive the powder molding material to rotate. When the powder molding material rotates, since the surfaces of the placement frame 57 and the contact frame 19 are provided with heating holes, the powder molding material can be heated more evenly during the rotation. The surface of the slide rail 56 is slidably connected to the inner wall of the moving groove.

[0046] In use, first pull out the placement rack 57, then place the powder molding material to be heated inside the placement rack 57, then push the placement rack 57 back to its original position, and then start the electric push rod 3 to push the grooved ring 11 to move towards each other. When the grooved ring 11 moves, it will drive the annular slider 12 to move towards each other. When the annular slider 12 moves, it will push the telescopic plate 13 to retract towards each other. At the same time, the annular slider 12 will push the extrusion plate 14 to move towards each other, and then the extrusion plate 14 will extrude the elastic plate 15. When the elastic plate 15 is extruded, the middle part will bend. When the middle part of the elastic plate 15 bends, it will push the lower pressure plate 16 to move downward. When the lower pressure plate 16 moves downward, it will... The U-shaped ring frame 17 slides downwards along the inner wall of the groove. As the U-shaped ring frame 17 moves downwards, it pushes the contact frame 19 downwards. When the contact frame 19 moves, it contacts the top of the powder molding material. Simultaneously, the U-shaped ring frame 17 compresses the limiting telescopic rod 18. When the limiting telescopic rod 18 is compressed, it retracts downwards, and when it retracts to its final position, it limits the U-shaped ring frame 17, thus ensuring slight contact between the contact frame 19 and the powder molding material, preventing damage. Simultaneously, the U-shaped ring frame 17 slides downwards, causing the curved telescopic plate 31 to move downwards. When the curved telescopic plate 31 moves, it pushes the limiting plate 32 downwards. When the limiting plate 32 moves downwards, it drives the curved... As the curved frame 33 moves downward, it comes into contact with the inclined block 37. During this movement, the curved frame 33 pulls the limiting plate 32 towards the opposite direction, thus limiting the two ends of the powder forming material. Simultaneously, the limiting plate 32 pushes the curved telescopic plate 31 to retract towards the opposite direction. As the curved telescopic plate 31 moves downward, it also drives the curved rod 34 downward. When the curved rod 34 moves, it drives the right-angle limiting plate 35 downward, contacting the slide rail 56 and the two ends of the moving groove. This causes displacement of the slide rail 56 during rotation. When the material is placed on the inner wall of the placement frame 57, it also contacts the powder through the contact frame 19 and the limiting plate 32. The molding material is fully confined. At this time, the heating device 4 is activated to heat the inside of the furnace body 1. Then, the motor 5 is activated to drive the rotating shaft 51 to rotate. When the rotating shaft 51 rotates, it will drive the rotating frame 52 to rotate. When the rotating frame 52 rotates, it will drive the rotating ring 53 to rotate on the inner wall of the annular groove. When the rotating ring 53 rotates, it will drive the driven column 54 to rotate. At the same time, the driven column 54 will drive the support plate 55 to rotate. When the support plate 55 rotates, it will drive the slide rail 56 and the placement frame 57 to rotate. When the placement frame 57 rotates, it will drive the powder molding material to rotate. During the rotation of the powder molding material, since the surfaces of the placement frame 57 and the contact frame 19 are provided with heating holes, the powder molding material can be heated more evenly during the rotation.

[0047] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A powder metallurgy sintering furnace, comprising a furnace body (1), a sealing door (2) rotatably connected to one end of the furnace body (1), electric push rods (3) fixedly connected to both sides of the furnace body (1), a heating device (4) fixedly connected to the upper surface of the furnace body (1), and a motor (5) fixedly connected to one end of the furnace body (1) away from the sealing door (2), characterized in that, Also includes; The fixing mechanism (10) includes a U-shaped ring frame (17) and a grooved ring (11). The bottom of the U-shaped ring frame (17) is fixedly connected to a limiting telescopic rod (18), and the bottom of the limiting telescopic rod (18) is fixedly connected to a contact frame (19). The inner wall of the grooved ring (11) is slidably connected to an annular slider (12), the surface of the annular slider (12) is fixedly connected to a telescopic plate (13), the upper surface of the annular slider (12) is fixedly connected to a pressing plate (14), the end of the pressing plate (14) away from the annular slider (12) is fixedly connected to an elastic plate (15), and the surface of the elastic plate (15) is fixedly connected to a lower pressure plate (16). The limiting mechanism (30) includes a bent rod (34) and a bent telescopic plate (31), and a right-angle limiting plate (35) is fixedly connected to the end of the bent rod (34). The end of the curved telescopic plate (31) is fixedly connected to a limiting plate (32), and the two ends of the limiting plate (32) are fixedly connected to a curved frame (33). The surface of the curved telescopic plate (31) is fixedly connected to a return spring (36). A rotating mechanism (50) includes a rotating ring (53) and a rotating shaft (51). A driven column (54) is fixedly connected to the inner wall of the rotating ring (53), and a support plate (55) is fixedly connected to the end of the driven column (54) away from the rotating ring (53). The end of the rotating shaft (51) is fixedly connected to a rotating frame (52), the surface of the support plate (55) is fixedly connected to a slide rail (56), the surface of the slide rail (56) is provided with a placement rack (57), and the side of the support plate (55) away from the slide rail (56) is fixedly connected to a force-bearing inclined block (37).

2. The powder metallurgy sintering furnace according to claim 1, characterized in that: There are two electric push rods (3), and the two electric push rods (3) are symmetrically arranged with the furnace body (1) as the center. The furnace body (1) has an annular groove inside, and there are two annular grooves. The two annular grooves are symmetrical on the inner wall of the furnace body (1).

3. A powder metallurgy sintering furnace according to claim 2, characterized in that: The electric push rod (3) is close to one end of the grooved ring (11) and is fixedly connected to the surface of the grooved ring (11) through the surface of the furnace body (1). The end of the lower pressure plate (16) away from the elastic plate (15) is fixedly connected to the surface of the U-shaped ring frame (17). There are two U-shaped ring frames (17), and the two U-shaped ring frames (17) are symmetrically arranged with the grooved ring (11) as the center.

4. A powder metallurgy sintering furnace according to claim 3, characterized in that: The end of the curved telescopic plate (31) away from the curved telescopic plate (31) is fixedly connected to the top of the U-shaped ring frame (17). The number of right-angle limiting plates (35) is four, and they are divided into two groups of two. The four right-angle limiting plates (35) are symmetrically arranged with the groove ring (11) as the center. The end of the bent rod (34) away from the right-angle limiting plate (35) is fixedly connected to both sides of the curved telescopic plate (31).

5. A powder metallurgy sintering furnace according to claim 4, characterized in that: The end of the rotating shaft (51) is fixedly connected to the output end of the motor (5), the two ends of the rotating frame (52) are fixedly connected to the inner wall of the rotating ring (53), the surface of the rotating ring (53) is slidably connected to the inner wall of the annular groove, the surface of the support plate (55) is provided with a groove, the end of the curved frame (33) is in contact with the surface of the force-bearing inclined block (37), the end of the limiting telescopic rod (18) away from the U-shaped ring frame (17) is fixedly connected to the inner wall of the groove, the two ends of the U-shaped ring frame (17) are slidably connected to the inner wall of the groove, the surface of the contact frame (19) and the placement frame (57) are both provided with heating holes, the two sides of the placement frame (57) are provided with moving grooves, and the surface of the slide rail (56) is slidably connected to the inner wall of the moving groove.

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