Low-temperature quenching heat treatment device for high-speed steel parts

Abstract

The invention provides a high-speed steel part low-temperature quenching heat treatment device, and relates to the technical field of high-speed steel quenching. A stirring motor is installed on the lower side face of the supporting plate, a driving gear is installed on a motor shaft of the stirring motor, and a middle rotating disc is rotationally connected to the supporting plate; a transmission gear is welded to the bottom end of the transmission rotating rod, a stirring sleeve is welded to the top end of the transmission rotating rod, and a stirring plate is welded to the outer side face of the stirring sleeve; the outer side face of the cross-shaped guide frame is slidably connected with an outer supporting frame. Through the arrangement of a driving gear, a middle rotating disc, a transmission gear, a stirring plate and a stirring sleeve, low-temperature oil close to the cooling pipe rapidly flows and fills the peripheral area of the high-speed steel bearing ring; the problem that in the process that a traditional high-speed steel bearing ring part enters a quenching pool, due to the fact that low-temperature cooling oil flows slowly and cannot be rapidly filled and replaced to the bearing ring part, the temperature of oil around the bearing ring part rises, and rapid cooling of the bearing ring part is affected is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-speed steel quenching, and more specifically, relates to a low-temperature quenching heat treatment device for high-speed steel parts. Background Art

[0002] High-speed steel (HSS) parts are widely used in the manufacturing of various cutting tools, stamping dies, and bearing rings due to their high hardness, wear resistance, and heat resistance. Currently, to ensure superior wear resistance and compressive strength, HSS bearing rings typically undergo a quenching process. The bearing rings are heated to a temperature between 1180 and 1200°C and then rapidly cooled in a quenching tank to induce a martensitic transformation, achieving a specific martensitic structure. However, due to the high temperature of the bearing rings prior to cooling, the cooling process rapidly heats the surrounding coolant. This slows the flow of coolant within the quenching tank, preventing the coolant from quickly reaching the surrounding area. This severely impacts the cooling process, preventing the martensitic transformation from occurring effectively in HSS bearing rings, and compromising the quality of the quenching heat treatment. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a low-temperature quenching heat treatment device for high-speed steel parts to solve the problem that in the process of traditional high-speed steel bearing ring parts entering the quenching pool, the low-temperature cooling oil flows slowly and cannot be quickly filled and replaced to the bearing ring parts, causing the oil temperature around the bearing ring parts to rise and affect the rapid cooling of the bearing ring parts.

[0004] The present invention provides a low-temperature quenching heat treatment device for high-speed steel parts, comprising a column; a quenching pool is welded to the top of the column, a bottom plate is welded to the bottom end of the column, and a support plate is welded to the outer side of the column; further comprising a sleeve and a transmission rotating rod; an intermediate turntable is rotatably connected to the upper side of the support plate, a stirring motor is installed on the lower side of the support plate, and a driving gear for driving the intermediate turntable to rotate along the axis is installed on the motor shaft of the stirring motor; a plurality of transmission rotating rods rotatably connected to the quenching pool are provided around the intermediate turntable, the bottom end of the transmission rotating rod extends to the bottom of the quenching pool and is welded with a transmission gear meshing with the intermediate turntable, and a stirring sleeve is provided on the outer side of the transmission rotating rod; A controller is installed on the outer side of the quenching pool, an air supply pump is installed on the upper side of the quenching pool, a beam is welded on the upper side of the quenching pool, a lifting motor is installed on the upper side of the beam, a threaded lifting rod is installed on the motor shaft of the lifting motor, a guide column is welded on the left end of the beam, the outer side of the guide column is slidably connected to a skateboard, the upper side of the skateboard is installed with a cylinder, and the bottom end of the telescopic rod of the cylinder is installed with a pressure block; a return spring is welded on the inner side of the sleeve, a support frame is passed through the return spring, a skateboard is welded on the top of the sleeve, a cross guide frame is welded on the inner side of the sleeve, the outer side of the cross guide frame is slidably connected to an external support frame, and a placement plate for placing high-speed steel bearing rings is welded on the bottom end of the external support frame.

[0005] In at least some embodiments, the number of the stirring sleeves is six groups, each group of stirring sleeves is a cylindrical barrel structure with an open bottom end, and six groups of stirring plates are welded on the outer side of the stirring sleeve barrel structure. The stirring plates are distributed in a circular array around the vertical center axis of the stirring sleeve, and the stirring plates are arc-shaped curved plate structures.

[0006] In at least some embodiments, the intermediate turntable is a circular turntable structure, an outer side surface of the circular turntable structure of the intermediate turntable is surrounded by an external tooth structure, and the driving gear and the transmission gear are both meshed and connected to the external tooth structure of the intermediate turntable.

[0007] In at least some embodiments, the number of the external support frames is four groups, and the external support frames are distributed in a circular array around the vertical center axis of the sleeve. Each group of external support frames is a fan-shaped strip structure. A protrusion is welded on the outer side surface of the fan-shaped strip structure of the external support frame near the bottom end, and the end of the protrusion is an arc-shaped structure. A rectangular through groove that cooperates with the cross guide frame and a limiting hole that cooperates with the support frame are provided on the outer side surface of the fan-shaped strip structure of the external support frame near the top end.

[0008] In at least some embodiments, the pressing block is a conical structure, and the top edges of the four sets of fan-shaped strip structures of the outer support frames are all fitted on the inclined conical surface of the conical structure of the pressing block.

[0009] In at least some embodiments, a large through hole is provided at the center of the upper side surface of the skateboard, the telescopic rod of the cylinder is inserted into the large through hole of the skateboard, a small through hole is provided on the upper side surface of the skateboard near the left end, the guide column is inserted into the small through hole of the skateboard, a threaded through hole is provided on the upper side surface of the skateboard near the right end, and the outer side surface of the threaded lifting rod is threadedly engaged with the threaded through hole of the skateboard.

[0010] In at least some embodiments, a circulating refrigerator is installed on the outer side of the quenching pool, and a cooling pipe is installed on the circulating refrigerator. The cooling pipe is distributed on the inner pool wall of the quenching pool. An electromagnetic heating coil is installed near the top of the outer side of the quenching pool. A through hole is provided on the upper side of the quenching pool, and a temperature detection sensor is installed in the through hole of the quenching pool.

[0011] In at least some embodiments, the number of the return springs is four groups, and the return springs are distributed in a circular array around the vertical central axis of the sleeve. The sleeve is welded to one end of the return spring, and the outer support frame is welded to the other end of the return spring.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the stirring motor drives the outer tooth structure of the intermediate turntable to rotate through the driving gear, so that the six groups of transmission gears meshingly connected on the outer side of the outer tooth structure of the intermediate turntable drive the stirring plate on the outer side of the stirring sleeve to rotate through the transmission rotating rod. The arc-shaped bent plate structure of the stirring plate stirs the oil in the quenching pool, allowing the low-temperature oil near the cooling pipe to flow rapidly and fill the area around the high-speed steel bearing ring. The oil around the high-speed steel bearing ring is kept at a low temperature, ensuring that the high-speed steel bearing ring undergoes martensitic transformation within a suitable cooling temperature range, thereby effectively improving the quenching heat treatment quality of the bearing ring parts.

[0013] 2. In the present invention, the external support extrusion structure formed by the inclined conical surface of the pressing block cone at the top position of the four groups of external support frames is used to make the four groups of external support frames move centrifugally synchronously along the cross guide frame, so that the outer side protrusions of the four groups of external support frames can perform external support clamping on high-speed steel bearing rings of different diameters, preventing the high-speed steel bearing rings from falling off the placement plate and into the bottom of the quenching pool due to the flow of oil, and ensuring that the high-speed steel bearing rings are stably placed and cooled on the placement plate and in the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a front structural schematic diagram of the present invention.

[0016] Figure 3 It is a left-side structural schematic diagram of the present invention.

[0017] Figure 4 It is a schematic diagram of the top structure of the present invention.

[0018] Figure 5 It is a schematic diagram of the structure of the present invention when viewed from the side.

[0019] Figure 6 It is a schematic diagram of the cutaway structure of the present invention.

[0020] Figure 7 The present invention Figure 6 Schematic diagram of the enlarged structure of part A in the middle.

[0021] Figure 8 The present invention Figure 6 Schematic diagram of the enlarged structure of part B in the middle.

[0022] Figure 9 It is a left side structural schematic diagram of the present invention.

[0023] Figure 10 The present invention Figure 9 Schematic diagram of the enlarged structure of part C in the middle.

[0024] Figure numerals: 1. base plate; 2. column; 3. circulating refrigerator; 4. quenching pool; 5. controller; 6. cylinder; 7. beam; 8. lifting motor; 9. slide plate; 10. threaded lifting rod; 11. temperature detection sensor; 12. air supply pump; 13. sleeve; 14. stirring motor; 15. transmission gear; 16. intermediate turntable; 17. outer support frame; 18. stirring plate; 19. guide column; 20. high-speed steel bearing ring; 21. driving gear; 22. electromagnetic heating coil; 23. cooling pipe; 24. transmission rotating rod; 25. stirring sleeve; 26. pressure block; 27. support frame; 28. return spring; 29. ​​cross guide frame; 30. support plate; 31. bump; 32. placement plate. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0026] like Figures 1-10 As shown, the present invention provides a low-temperature quenching heat treatment device for high-speed steel parts, including a column 2; a quenching pool 4 is welded to the top of the column 2, a bottom plate 1 is welded to the bottom end of the column 2, and a support plate 30 is welded to the outer side of the column 2; it also includes a sleeve 13 and a transmission rod 24; the upper side of the support plate 30 is rotatably connected to the intermediate turntable 16, the lower side of the support plate 30 is installed with a stirring motor 14, and the motor shaft of the stirring motor 14 is installed with a driving gear 21 for driving the intermediate turntable 16 to rotate along the axis; the intermediate turntable 16 is circumferentially provided with a plurality of transmission rods 24 rotatably connected to the quenching pool 4, the bottom end of the transmission rod 24 extends to the bottom of the quenching pool 4 and is welded with a transmission gear 15 meshing with the intermediate turntable 16, and a stirring sleeve 25 is provided on the outer side of the transmission rod 24; A controller 5 is installed on the outer side of the quenching pool 4, an air supply pump 12 is installed on the upper side of the quenching pool 4, a beam 7 is welded on the upper side of the quenching pool 4, a lifting motor 8 is installed on the upper side of the beam 7, a threaded lifting rod 10 is installed on the motor shaft of the lifting motor 8, a guide column 19 is welded on the left end of the beam 7, the outer side of the guide column 19 is slidably connected to the slide 9, the upper side of the slide 9 is installed with the cylinder 6, and the bottom end of the telescopic rod of the cylinder 6 is installed with a pressure block 26; a return spring 28 is welded on the inner side of the sleeve 13, a support frame 27 is passed through the return spring 28, the top of the sleeve 13 is welded with the slide 9, the inner side of the sleeve 13 is welded with a cross guide frame 29, the outer side of the cross guide frame 29 is slidably connected to the outer support frame 17, the bottom end of the outer support frame 17 is welded with a placement plate 32, and a high-speed steel bearing ring 20 is placed on the upper side of the placement plate 32.

[0027] In an embodiment of the present invention, there are six groups of stirring sleeves 25, and each group of stirring sleeves 25 is a cylindrical barrel structure with an open bottom end. Six groups of stirring plates 18 are welded to the outer side of the barrel structure of the stirring sleeve 25. The stirring plates 18 are distributed in a circular array around the vertical center axis of the stirring sleeve 25. The stirring plates 18 are arc-shaped bent plate structures. The stirring plates 18 shovel the oil through their own arc-shaped bent plate structure, so that the oil flows rapidly inside the quenching pool 4, ensuring that the temperature distribution of the cooling oil in the quenching pool 4 remains balanced.

[0028] In the embodiment of the present invention, the intermediate turntable 16 is a circular disk structure, and the outer side surface of the circular disk structure of the intermediate turntable 16 is surrounded by an external tooth structure. The driving gear 21 and the transmission gear 15 are both meshed and connected at the outer tooth structure of the intermediate turntable 16. The stirring motor 14 drives the intermediate turntable 16 to rotate through the driving gear 21, and the intermediate turntable 16 drives the six groups of transmission gears 15 meshed and connected on the outer side surface to rotate synchronously, so that the transmission gear 15 drives the stirring sleeve 25 to rotate synchronously through the transmission rod. The arc-shaped stirring plates 18 on the outer sides of the six groups of stirring sleeves 25 stir the oil synchronously, so that the oil cooled by the cooling pipe 23 in the quenching pool 4 is quickly stirred and flowed to the center position of the quenching pool 4, ensuring that the oil around the high-speed steel bearing ring 20 remains at a low temperature.

[0029] In an embodiment of the present invention, there are four groups of external support frames 17, and the external support frames 17 are distributed in a circular array around the vertical center axis of the sleeve 13. Each group of external support frames 17 is a fan-shaped strip structure. A protrusion 31 is welded on the outer side surface of the fan-shaped strip structure of the external support frame 17 near the bottom end, and the end of the protrusion 31 is an arc-shaped structure. A rectangular through groove cooperating with the cross guide frame 29 and a limiting hole cooperating with the support frame 27 are provided on the outer side surface of the fan-shaped strip structure of the external support frame 17 near the top end. The cross guide frame 29 is inserted into the rectangular through grooves of the four groups of external support frames 17. The cross guide frame 29 supports the four groups of external support frames 17 to slide inward or outward in the rectangular through grooves of the four groups of external support frames 17, ensuring that the external support frame 17 stably clamps and fixes the high-speed steel bearing ring 20.

[0030] In the embodiment of the present invention, the pressing block 26 is a conical structure, and the top edges of the fan-shaped strip structures of the four groups of external support frames 17 are all fitted on the inclined conical surface of the conical structure of the pressing block 26. In the process of the telescopic rod of the cylinder 6 driving the pressing block 26 of the conical structure to move downward, the conical structure of the pressing block 26 pushes the four groups of external support frames 17 to move outward synchronously along the cross guide frame 29, so that the external support frames 17 can quickly support and clamp the high-speed steel bearing rings 20 of different diameters.

[0031] In the embodiment of the present invention, a large through hole is provided at the center position of the upper side surface of the skateboard 9, the telescopic rod of the cylinder 6 is inserted into the large through hole of the skateboard 9, a small through hole is provided on the upper side surface of the skateboard 9 near the left end, the guide column 19 is inserted into the small through hole of the skateboard 9, and a threaded through hole is provided on the upper side surface of the skateboard 9 near the right end. The outer side surface of the threaded lifting rod 10 is threadedly engaged with the threaded through hole of the skateboard 9, and the lifting motor 8 drives the sleeve 13 on the lower side surface of the skateboard 9 through the threaded lifting rod 10, so that the sleeve 13 drives the high-speed steel bearing ring 20 clamped on the outer side surface of the outer support frame 17 through the support frame 27 and the cross guide frame 29 to penetrate into the oil of the quenching pool 4 for quenching and cooling.

[0032] In the embodiment of the present invention, a circulating refrigerator 3 is installed on the outer side of the quenching pool 4, and a cooling pipe 23 is installed on the circulating refrigerator 3. The cooling pipe 23 is distributed on the inner pool wall of the quenching pool 4. The circulating refrigerator 3 circulates and cools the heat exchange coolant flowing on the inner side of the cooling pipe 23, and the cooling pipe 23 continuously exchanges heat and cools the cooling oil in the quenching pool 4. An electromagnetic heating coil 22 is installed near the top of the outer side of the quenching pool 4. The controller 5 passes high-frequency alternating current to the electromagnetic heating coil 22 through a wire. The electromagnetic heating coil 22 generates a magnetic field to perform electromagnetic induction heating on the high-speed steel bearing ring 20. The electromagnetic heating coil 22 and the quenching pool 4 are arranged from top to bottom. The cloth structure ensures that the high-speed steel bearing ring 20 can be quickly sent to the quenching pool 4 for cooling after heating is completed, so as to avoid the high-speed steel bearing ring 20 staying in the external environment for a long time and causing its own temperature to drop. A through hole is provided on the upper side of the quenching pool 4, and a temperature detection sensor 11 is installed in the through hole of the quenching pool 4. The detection end of the temperature detection sensor 11 is deeply immersed in the oil of the quenching pool 4. The temperature detection sensor 11 detects the oil temperature of the quenching pool 4 in real time and transmits the temperature data back to the controller 5, so that the controller 5 controls the circulating refrigerator 3 to adjust the refrigeration temperature according to the temperature value of the temperature detection sensor 11, ensuring that the oil temperature of the quenching pool 4 is kept within the quenching cooling range.

[0033] In the embodiment of the present invention, there are four groups of return springs 28, and the return springs 28 are distributed in a circular array around the vertical central axis of the sleeve 13. The sleeve 13 is welded to one end of the return spring 28, and the external support frame 17 is welded to the other end of the return spring 28. In the process of the telescopic rod of the cylinder 6 driving the cone-shaped pressure block 26 to move upward, the four groups of return springs 28 respectively drive the four groups of external support frames 17 to move inward along the cross guide frame 29, completing the automatic loosening of the four groups of external support frames 17.

[0034] Specific usage and effects of the embodiments of the present invention: When the present invention performs low-temperature quenching heat treatment on the high-speed steel bearing ring 20, the bearing ring 20 is placed on the outside of the four groups of outer supports 17, and then the controller 5 controls the air supply pump 12 to supply air to the cylinder 6 through the wire. At this time, the telescopic rod of the cylinder 6 pushes the pressure block 26 to move downward, and the conical surface structure of the pressure block 26 synchronously squeezes the four groups of outer supports 17 downward. The four groups of outer supports 17 move separately along the cross guide frame 29 until the protrusions 31 of the outer support frame 17 fit on the inner wall of the high-speed steel bearing ring 20, so that the four groups of outer support frames 17 externally support, squeeze and clamp the high-speed steel bearing ring 20, and then the controller 5 controls the stirring motor through the wire. The machine 14, the circulating refrigerator 3, the electromagnetic heating coil 22 and the lifting motor 8 are started synchronously. The circulating refrigerator 3 continuously cools the coolant flowing in the cooling pipe 23, and the cooling pipe 23 cools the oil inside the quenching pool 4 by heat exchange. The lifting motor 8 drives the slide 9 engaged with the outer side of the threaded lifting rod 10 to move vertically downward along the guide column 19. The slide 9 drives the high-speed steel bearing ring 20 clamped by the outer support frame 17 to move to the electromagnetic heating coil 22 through the sleeve 13, the support frame 27 and the cross guide frame 29. The electromagnetic heating coil 22 heats the high-speed steel bearing ring 20 to a suitable temperature, and then the electromagnetic heating coil 22 is powered off. Close, the slide plate 9 drives the high-speed steel bearing ring 20 to penetrate into the cooling oil of the oil inside the quenching pool 4 again, and at this time, the stirring motor 14 drives the intermediate turntable 16 meshing with the outer side of the driving gear 21 to rotate. Since the outer tooth structure of the intermediate turntable 16 is meshed with the six sets of transmission gears 15, the outer tooth structure of the intermediate turntable 16 drives the transmission rotating rod 24 welded to the transmission gear 15 to rotate, and the transmission rotating rod 24 drives the stirring plate 18 welded to the outer side of the stirring sleeve 25 to rotate. The stirring plate 18 stirs the oil, so that the low-temperature oil near the cooling pipe 23 quickly flows to fill the area around the high-speed steel bearing ring 20, so that the area around the high-speed steel bearing ring 20 is The surrounding oil remains at a low temperature. After the high-speed steel bearing ring 20 is cooled, the slide plate 9 lifting motor 8 drives the slide plate 9 engaged with the outer side of the threaded lifting rod 10 to move vertically upward along the guide column 19, and the high-speed steel bearing ring 20 is separated from the cooling oil. Finally, the controller 5 controls the air supply pump 12 to start through the wire. The air supply pump 12 controls the telescopic rod of the air cylinder 6 through the air pipe to drive the pressure block 26 to rise upward. At this time, the four groups of return springs 28 respectively push the four groups of external support frames 17 to move centripetally along the cross guide frame 29. The four groups of external support frames 17 loosen the high-speed steel bearing ring 20, thereby completing the low-temperature quenching heat treatment of the high-speed steel bearing ring 20.

[0035] The installation, connection or setting methods of all the above components are common mechanical methods, such as welding, threaded connection, screw connection, etc., and the specific structure, model and coefficient index of all its components are its own technology. As long as it can achieve its beneficial effect, it can be implemented. The above-mentioned circulating refrigerator 3, controller 5, cylinder 6, lifting motor 8, temperature detection sensor 11, air supply pump 12, sleeve 13, stirring motor 14, high-speed steel bearing ring 20, drive gear 21, electromagnetic heating coil 22, and cooling pipe 23 are all common components on the market. When purchased and used, they only need to be connected according to the instruction manual purchased together, so they will not be described in detail here.

[0036] The technical solutions of the present invention are not limited to the scope of the embodiments of the present invention, and the technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. A low-temperature quenching heat treatment device for high-speed steel parts, comprising a column (2); a quenching pool (4) is welded to the top of the column (2), a bottom plate (1) is welded to the bottom of the column (2), and a support plate (30) is welded to the outer side of the column (2); characterized in that: It also includes a sleeve (13) and a transmission rod (24); the upper side of the support plate (30) is rotatably connected to the intermediate turntable (16), the lower side of the support plate (30) is installed with a stirring motor (14), and the motor shaft of the stirring motor (14) is installed with a driving gear (21) for driving the intermediate turntable (16) to rotate along the axis; the intermediate turntable (16) is circumferentially provided with a plurality of transmission rods (24) rotatably connected to the quenching pool (4), the bottom end of the transmission rod (24) extends to the bottom of the quenching pool (4) and is welded with a transmission gear (15) meshing with the intermediate turntable (16), and a stirring sleeve (25) is provided on the outer side of the transmission rod (24); The outer side of the quenching pool (4) is installed with a controller (5), the upper side of the quenching pool (4) is installed with an air supply pump (12), the upper side of the quenching pool (4) is welded with a beam (7), the upper side of the beam (7) is installed with a lifting motor (8), the motor shaft of the lifting motor (8) is installed with a threaded lifting rod (10), the left end of the beam (7) is welded with a guide column (19), the outer side of the guide column (19) is slidably connected with a slide plate (9), the upper side of the slide plate (9) is installed with a cylinder (6), and the air cylinder (6) is installed. A pressure block (26) is installed at the bottom end of the telescopic rod of the cylinder (6); a return spring (28) is welded to the inner side of the sleeve (13), a support frame (27) is inserted into the return spring (28), a slide plate (9) is welded to the top end of the sleeve (13), a cross guide frame (29) is welded to the inner side of the sleeve (13), an outer support frame (17) is slidably connected to the outer side of the cross guide frame (29), and a placement plate (32) for placing a high-speed steel bearing ring (20) is welded to the bottom end of the outer support frame (17).

2. A low-temperature quenching heat treatment device for high-speed steel parts according to claim 1, characterized in that: The number of the stirring sleeves (25) is six groups, and each group of stirring sleeves (25) is a cylindrical barrel structure with an open bottom end. Six groups of stirring plates (18) are welded to the outer side surface of the barrel structure of the stirring sleeve (25). The stirring plates (18) are distributed in a ring array around the vertical center axis of the stirring sleeve (25), and the stirring plates (18) are arc-shaped curved plate structures.

3. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: The intermediate turntable (16) is a circular turntable structure. An external tooth structure is provided around the outer side of the circular turntable structure of the intermediate turntable (16). The driving gear (21) and the transmission gear (15) are both meshed and connected to the external tooth structure of the intermediate turntable (16).

4. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: The number of the external support frames (17) is four groups, and the external support frames (17) are distributed in a circular array around the vertical central axis of the sleeve (13). Each group of external support frames (17) is a fan-shaped strip structure. A protrusion (31) is welded on the outer side surface of the fan-shaped strip structure of the external support frame (17) near the bottom end, and the end of the protrusion (31) is an arc-shaped structure. A rectangular through groove cooperating with the cross guide frame (29) and a limiting hole cooperating with the support frame (27) are provided on the outer side surface of the fan-shaped strip structure of the external support frame (17) near the top end.

5. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: The pressing block (26) is a conical structure, and the top edges of the fan-shaped strip structures of the four sets of external support frames (17) are all fitted on the inclined conical surface of the conical structure of the pressing block (26).

6. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: A large through hole is provided at the center of the upper side surface of the slide plate (9), the telescopic rod of the cylinder (6) is inserted into the large through hole of the slide plate (9), a small through hole is provided at the upper side surface of the slide plate (9) near the left end, the guide column (19) is inserted into the small through hole of the slide plate (9), a threaded through hole is provided at the upper side surface of the slide plate (9) near the right end, and the outer side surface of the threaded lifting rod (10) is threadedly engaged with the threaded through hole of the slide plate (9).

7. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: A circulating refrigerator (3) is installed on the outer side of the quenching pool (4), a cooling pipe (23) is installed on the circulating refrigerator (3), and the cooling pipe (23) is distributed on the inner pool wall of the quenching pool (4). An electromagnetic heating coil (22) is installed near the top of the outer side of the quenching pool (4), and a through hole is provided on the upper side of the quenching pool (4). A temperature detection sensor (11) is installed in the through hole of the quenching pool (4).

8. The low temperature quenching heat treatment device for high speed steel parts according to claim 1, characterized in that: The number of the return springs (28) is four, and the return springs (28) are distributed in a ring array around the vertical central axis of the sleeve (13). One end of the return spring (28) is welded to the sleeve (13), and the other end of the return spring (28) is welded to the outer support frame (17).

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