Powder metallurgy sintering furnace

Abstract

The invention relates to the technical field of powder metallurgy sintering furnace equipment, and discloses a powder metallurgy sintering furnace which comprises a rotating shaft, a rotating frame is fixedly connected to the end of the rotating shaft, a sliding rail is fixedly connected to the surface of a supporting plate, a containing frame is arranged on the surface of the sliding rail, and a stress inclined block is fixedly connected to the face, away from the sliding rail, of the supporting plate. By arranging the rotating mechanism, when a rotating ring rotates, a driven column is driven to rotate, meanwhile, a supporting plate is driven to rotate through the driven column, when the supporting plate rotates, a sliding rail and a placing frame are driven to rotate, when the placing frame rotates, a powder forming raw material is driven to rotate, and when the powder forming raw material rotates, the powder forming raw material does not fall off. Due to the fact that the heating holes are formed in the surfaces of the placing frame and the contact frame, the powder forming raw materials can be heated more evenly in the rotating process, the powder forming raw materials are effectively heated in the rotating process, the powder forming raw materials are heated evenly, and therefore the sintering quality of the powder forming raw materials is improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy sintering furnace equipment, in particular to a powder metallurgy sintering furnace. Background Art

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

[0003] In the process of heating the pressed powder raw materials in the existing powder metallurgy sintering furnace, the bottom of the pressed raw materials contacts the surface of the placement rack, which may cause uneven heating of the bottom of the raw materials during sintering, thereby affecting the quality of the powder metallurgy sintering. Summary of the Invention

[0004] The object of the present invention is to provide a powder metallurgy sintering furnace to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a powder metallurgy sintering furnace, comprising a furnace body, wherein a sealing door is rotatably connected to the end of the furnace body, electric push rods are fixedly connected to both sides of the furnace body, a heating device is fixedly connected to the upper surface of the furnace body, and a motor is fixedly connected to the end of the furnace body away from the sealing door, and further comprising: A fixing mechanism, the fixing mechanism comprising a U-shaped ring frame, the bottom of the U-shaped ring frame is fixedly connected to a limited telescopic rod, and the bottom of the limited telescopic rod is fixedly connected to a contact frame; A limiting mechanism, the limiting mechanism comprising a bent rod, the end of which is fixedly connected to a right-angle limiting plate; The rotating mechanism includes a rotating ring, the inner wall of the rotating ring is fixedly connected to a driven column, and the end of the driven column away from the rotating ring is fixedly connected to a support plate.

[0006] Furthermore, there are two electric push rods, which are symmetrically arranged with the furnace body as the center, and an annular chute is provided inside the furnace body, and the two annular chute are symmetrically arranged on the inner wall of the furnace body.

[0007] Furthermore, the fixing mechanism includes a groove ring, the inner wall of the groove ring is slidably connected to a ring-shaped slider, the surface of the ring-shaped slider is fixedly connected to a telescopic plate, the upper surface of the ring-shaped slider is fixedly connected to an extrusion plate, the end of the extrusion plate away from the ring-shaped slider is fixedly connected to an elastic plate, and the surface of the elastic plate is fixedly connected to a lower pressure plate.

[0008] Furthermore, the electric push rod is close to one end of the groove ring and passes through the surface of the furnace body and is fixedly connected to the surface of the groove ring. 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, and the two U-shaped ring frames are symmetrically arranged with the groove ring as the center.

[0009] Furthermore, the limiting mechanism includes a curved telescopic plate, the end of the curved telescopic plate is fixedly connected to the limiting plate, both ends of the limiting plate are fixedly connected to a curved frame, and the surface of the curved telescopic plate is fixedly connected to a reset spring.

[0010] Furthermore, one end of the bent telescopic plate away from the bent telescopic plate is fixedly connected to the top of the U-shaped ring frame, and the number of the right-angle limit plates is four, which are divided into two groups of two each. The four right-angle limit plates are symmetrically arranged with the groove ring as the center, and one end of the bent rod away from the right-angle limit plate is fixedly connected to both sides of the bent telescopic plate.

[0011] Furthermore, the rotating mechanism includes a rotating shaft, the end of the rotating shaft is fixedly connected to a rotating frame, the surface of the support plate is fixedly connected to a slide rail, the surface of the slide rail is provided with a placement frame, and the side of the support plate away from the slide rail is fixedly connected to a force-bearing inclined block.

[0012] Furthermore, the end of the rotating shaft is fixedly connected to the output end of the motor, the two 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 contacts the surface of the force-bearing oblique 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, the two 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 provided with heating holes, and movable grooves are provided on both sides of the placement frame, and the surface of the slide rail is slidably connected to the inner wall of the movable groove.

[0013] The present invention has the following beneficial effects: The present invention sets a fixing mechanism, first pulls out the placement rack, then places the powder molding raw materials that need to be heated inside the placement rack, then pushes the placement rack to its original position, and then starts the electric push rod to push the groove ring to move in the direction of mutual approach. When the groove ring moves, it drives the annular slider to move in the direction of each other. When the annular slider moves, it pushes the telescopic plate to shrink in the direction of mutual approach. At the same time, the annular slider pushes the extrusion plate to move in the direction of mutual approach, and then the extrusion plate is squeezed by the extrusion plate. When the elastic plate is squeezed, the middle part will bend. When the middle part of the elastic plate is bent, it pushes the lower pressing plate to move downward. When the lower pressing plate moves downward, it drives the U-shaped ring rack When the U-shaped ring frame moves downward, it will push the contact frame to move downward. When the contact frame moves, it will contact the top of the powder molding raw material. When the U-shaped ring frame moves downward, it will squeeze the limiting telescopic rod. When the limiting telescopic rod is squeezed, it will shrink downward, and when it shrinks into place, it will limit the U-shaped ring frame, so that the contact frame and the powder molding raw material are slightly in contact, preventing the contact frame from damaging the powder molding raw material. The powder molding raw material is effectively fixed by the contact frame, so that the powder molding raw material cannot move when rotating. At the same time, the U-shaped ring frame is limited by the limiting telescopic rod, thereby preventing the contact frame from excessively contacting the powder molding raw material and causing damage.

[0014] When the U-shaped ring frame is in contact with the force-bearing oblique block and moves, the limit plate is pulled toward each other, thereby limiting the two ends of the powder molding raw material. At this time, the limit plate pushes the bent telescopic plate to contract in the direction of approaching each other during the movement of the limit plate. When the bent telescopic plate moves downward, it drives the bent rod to move downward, and when the bent rod moves, it drives the right-angle limit plate to move downward and contact the two ends of the slide rail and the moving groove, thereby preventing the slide rail from displacing during the rotation process. The setting of the limit plate effectively limits the two ends of the powder molding raw material by the setting of the limit plate, and at the same time, the setting of the right-angle limit plate limits the two ends of the slide rail and the moving groove to prevent deviation during rotation.

[0015] The present invention sets a rotating mechanism. When the raw material is placed on the inner wall of the placement rack, the powder molding raw material is limited in all directions by the contact rack and the limiting plate. At this time, the heating device is started to heat the inside of the furnace body, and then the motor is started to drive the rotating shaft to rotate. When the rotating shaft rotates, it will drive the rotating rack to rotate. When the rotating rack rotates, it will drive the rotating ring to rotate on the inner wall of the annular groove. When the rotating ring rotates, it will drive the driven column to rotate. At the same time, the support plate is driven to rotate through the driven column. When the support plate rotates, it will drive the slide rail and the placement rack to rotate. When the placement rack rotates, it will drive the powder molding raw material to rotate. When the powder molding raw material is in the process of rotation, since heating holes are provided on the surfaces of the placement rack and the contact rack, the powder molding raw material can be heated more evenly during the rotation process, effectively heating the powder molding raw material during the rotation process, and making the powder molding raw material heated evenly, thereby improving the sintering quality of the powder molding raw material.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the fixing mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the position-limiting telescopic rod of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A; Figure 6 Schematic diagram of the overall structure of the limiting mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the return spring of the present invention; Figure 8 This is a schematic diagram of the overall structure of the rotating mechanism of the present invention; Figure 9 It is a schematic diagram of the slide rail structure of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows: In the figure: 1. furnace body; 2. sealing door; 3. electric push rod; 4. heating device; 5. motor; 10. fixing mechanism; 11. groove 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. bent telescopic plate; 32. limiting plate; 33. curved frame; 34. bent rod; 35. right-angle limiting plate; 36. reset spring; 37. force-bearing oblique block; 50. rotating mechanism; 51. rotating shaft; 52. rotating frame; 53. rotating ring; 54. driven column; 55. supporting plate; 56. slide rail; 57. placement frame. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figures 1-9 As shown, the present invention is a powder metallurgy sintering furnace, comprising 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 further comprising; The fixing mechanism 10 includes a U-shaped ring frame 17. When the lower pressing plate 16 moves downward, the U-shaped ring frame 17 is driven to slide downward on the inner wall of the groove. The bottom of the U-shaped ring frame 17 is fixedly connected to a limited telescopic rod 18. The bottom of the limited telescopic rod 18 is fixedly connected to a contact frame 19. When the U-shaped ring frame 17 moves downward, it pushes the contact frame 19 to move downward. When the contact frame 19 moves, it contacts the top of the powder molding material. The limiting mechanism 30 includes a bent rod 34. When the bent telescopic plate 31 moves downward, the bent rod 34 is driven to move downward. The end of the bent rod 34 is fixedly connected to a right-angled limiting plate 35. When the bent rod 34 moves, the right-angled limiting plate 35 is driven to move downward and contact the ends of the slide rail 56 and the movable groove, thereby preventing the slide rail 56 from being displaced during rotation. The rotating mechanism 50 includes a rotating ring 53. When the rotating frame 52 rotates, the rotating ring 53 is driven to rotate on the inner wall of the annular groove. The inner wall of the rotating ring 53 is fixedly connected to a driven column 54. The end of the driven column 54 away from the rotating ring 53 is fixedly connected to a support plate 55. When the rotating ring 53 rotates, the driven column 54 is driven to rotate, and at the same time, the support plate 55 is driven to rotate through the driven column 54.

[0022] There are two electric push rods 3 symmetrically arranged around the furnace body 1 , and an annular chute is provided inside the furnace body 1 symmetrically on the inner wall of the furnace body 1 .

[0023] The fixing mechanism 10 includes a groove ring 11. First, the placement rack 57 is pulled out, and then the powder molding raw material to be heated is placed inside the placement rack 57. Then, the placement rack 57 is pushed to its original position, and then the electric push rod 3 is started to push the groove ring 11 to move in the direction of mutual approach. The inner wall of the groove ring 11 is slidably connected with an annular slider 12. When the groove ring 11 moves, it will drive the annular slider 12 to move in the direction of each other. The surface of the annular slider 12 is fixedly connected with a telescopic plate 13. When the annular slider 12 moves, it will push the telescopic plate 13 to shrink in the direction of mutual approach. The upper surface of the annular slider 12 The surface is fixedly connected with an extrusion plate 14, and the extrusion plate 14 is pushed to move toward each other through the annular slider 12. The end of the extrusion plate 14 away from the annular slider 12 is fixedly connected with an elastic plate 15, and the surface of the elastic plate 15 is fixedly connected with a lower pressure plate 16. When the middle part of the elastic plate 15 bends, it will push the lower pressure plate 16 to move downward, effectively fixing the powder molding raw material through the contact frame 19, so that the powder molding raw material cannot move during rotation. 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 raw material too heavily and causing damage.

[0024] The electric push rod 3 is close to one end of the groove ring 11, and passes through the surface of the furnace body 1 and is fixedly connected to the surface of the groove ring 11. 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, and then the elastic plate 15 is squeezed by the extrusion plate 14. When the elastic plate 15 is squeezed, the middle part will bend. There are two U-shaped ring frames 17, and the two U-shaped ring frames 17 are symmetrically arranged with the groove ring 11 as the center. When the U-shaped ring frame 17 moves downward, it will squeeze the limiting telescopic rod 18. When the limiting telescopic rod 18 is squeezed, it will shrink downward, and when it shrinks into place, it will limit the U-shaped ring frame 17, so that the contact frame 19 is in slight contact with the powder molding raw material, preventing the contact frame 19 from damaging the powder molding raw material.

[0025] When the cam 33 is in the closed position, the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position, and the cam 33 is in the closed position, so that the cam 33 is in the closed position,

[0026] 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 limit plate 32 will push the curved telescopic plate 31 to shrink in the direction of approaching each other during the movement. There are four right-angle limit plates 35, which are divided into two groups of two each. The four right-angle limit plates 35 are symmetrically arranged with the groove ring 11 as the center, and the end of the curved rod 34 away from the right-angle limit plate 35 is fixedly connected to both sides of the curved telescopic plate 31.

[0027] 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 molding raw material is also limited in all directions by the contact rack 19 and the limit 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, and the surface of the support plate 55 is fixedly connected to the slide rail 56. The surface of the slide rail 56 is provided with a 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 rack 33 moves, it will contact the force-bearing inclined block 37, effectively heating the powder molding raw material during the rotation process, so that the powder molding raw material is heated evenly, thereby improving the sintering quality of the powder molding raw material.

[0028] 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, and 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, and the end of the curved frame 33 contacts the surface of the force-bearing oblique 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, and 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, and 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 raw materials to rotate. When the powder molding raw materials are in the process of rotation, since the surfaces of the placement frame 57 and the contact frame 19 are provided with heating holes, the powder molding raw materials can be heated more evenly during the rotation process, and the surface of the slide rail 56 is slidably connected to the inner wall of the moving groove.

[0029] When in use, first pull out the placement rack 57, then place the powder molding raw material to be heated inside the placement rack 57, then push the placement rack 57 to its original position, and then start the electric push rod 3 to push the groove ring 11 in the direction of approaching each other. When the groove ring 11 moves, it will drive the annular slider 12 to move in the direction of each other. When the annular slider 12 moves, it will push the telescopic plate 13 to shrink in the direction of approaching each other. At the same time, the annular slider 12 pushes the extrusion plate 14 to move in the direction of approaching each other, and then the extrusion plate 15 is squeezed by the extrusion plate 14. When the elastic plate 15 is squeezed, the middle part will bend. When the middle part of the elastic plate 15 bends, it will push the lower pressing plate 16 to move downward. When the lower pressing plate 16 moves downward, Drive the U-shaped ring frame 17 to slide downward on the inner wall of the groove. 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 raw material. When the U-shaped ring frame 17 moves downward, it will squeeze the limiting telescopic rod 18. When the limiting telescopic rod 18 is squeezed, it will shrink downward, and when it shrinks into place, it will limit the U-shaped ring frame 17, so that the contact frame 19 is in slight contact with the powder molding raw material, preventing the contact frame 19 from damaging the powder molding raw material. When the U-shaped ring frame 17 slides downward, it will drive the curved telescopic plate 31 to move downward. When the curved telescopic plate 31 moves, it will push the limiting plate 32 to move downward. When the limiting plate 32 moves downward, it will drive the curved telescopic plate 31 to move downward. The rack 33 moves downward, and when the curved rack 33 moves, it will contact the force-bearing oblique block 37. When the curved rack 33 contacts and moves with the force-bearing oblique block 37, it will pull the limit plate 32 in the direction of approaching each other, thereby limiting the two ends of the powder molding raw material. At this time, the limit plate 32 will push the curved telescopic plate 31 to shrink in the direction of approaching each other during the movement. When the curved telescopic plate 31 moves downward, it will drive the curved rod 34 to move downward. When the curved rod 34 moves, it will drive the right-angle limit 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 being displaced during the rotation. When the raw material is placed on the inner wall of the placement rack 57, the powder is also contacted by the contact rack 19 and the limit plate 32. The molding raw materials are limited in all directions. 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. 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 support plate 55 is driven to rotate through the driven column 54. When the support plate 55 rotates, it will drive the slide rail 56 and the placement rack 57 to rotate. When the placement rack 57 rotates, it will drive the powder molding raw materials to rotate. When the powder molding raw materials are in the process of rotation, since heating holes are provided on the surfaces of the placement rack 57 and the contact rack 19, the powder molding raw materials can be heated more evenly during the rotation process.

[0030] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present 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), wherein the end of the furnace body (1) is rotatably connected to a sealing door (2), electric push rods (3) are fixedly connected to both sides of the furnace body (1), a heating device (4) is fixedly connected to the upper surface of the furnace body (1), and a motor (5) is fixedly connected to the end of the furnace body (1) away from the sealing door (2), wherein: Also includes; A fixing mechanism (10), the fixing mechanism (10) comprising a U-shaped ring frame (17), the bottom of the U-shaped ring frame (17) being fixedly connected to a limiting telescopic rod (18), the bottom of the limiting telescopic rod (18) being fixedly connected to a contact frame (19); A limiting mechanism (30), the limiting mechanism (30) comprising a bent rod (34), an end of the bent rod (34) being fixedly connected to a right-angle limiting plate (35); A rotating mechanism (50) comprises a rotating ring (53), an inner wall of the rotating ring (53) is fixedly connected to a driven column (54), and an end of the driven column (54) away from the rotating ring (53) is fixedly connected to a support plate (55).

2. A powder metallurgy sintering furnace according to claim 1, characterized in that: The number of the electric push rods (3) is set to two, and the two electric push rods (3) are symmetrically arranged with the furnace body (1) as the center. An annular slide groove is opened inside the furnace body (1), and the number of the annular slide grooves is set to two; the two annular slide grooves are symmetrically arranged on the inner wall of the furnace body (1).

3. A powder metallurgy sintering furnace according to claim 2, characterized in that: The fixing mechanism (10) comprises a groove ring (11), the inner wall of the groove 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 an extrusion plate (14), the end of the extrusion 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).

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

5. The powder metallurgy sintering furnace according to claim 4, characterized in that: The limiting mechanism (30) comprises a curved telescopic plate (31), the end of the curved telescopic plate (31) is fixedly connected to a limiting plate (32), both ends of the limiting plate (32) are fixedly connected to a curved frame (33), and a return spring (36) is fixedly connected to the surface of the curved telescopic plate (31).

6. The powder metallurgy sintering furnace according to claim 5, characterized in that: One end of the bent telescopic plate (31) away from the bent telescopic plate (31) is fixedly connected to the top of the U-shaped ring frame (17), the number of the right-angle limit plates (35) is four, and they are divided into two groups of two each, the four right-angle limit plates (35) are symmetrically arranged with the groove ring (11) as the center, and one end of the bent rod (34) away from the right-angle limit plate (35) is fixedly connected to both sides of the bent telescopic plate (31).

7. The powder metallurgy sintering furnace according to claim 6, characterized in that: The rotating mechanism (50) includes a rotating shaft (51), an end of the rotating shaft (51) is fixedly connected to a rotating frame (52), a surface of the supporting plate (55) is fixedly connected to a slide rail (56), a placement frame (57) is provided on the surface of the slide rail (56), and a side of the supporting plate (55) away from the slide rail (56) is fixedly connected to a force-bearing inclined block (37).

8. The powder metallurgy sintering furnace according to claim 7, 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) contacts 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 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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