Door body locking structure of vacuum gas quenching furnace

Abstract

The utility model relates to the technical field of vacuum gas quenching furnaces, in particular to a door body locking structure of a vacuum gas quenching furnace. Comprising a furnace body, a flange and a furnace door, a secondary sealing mechanism for sealing a hearth is arranged on the furnace body and the furnace door, the secondary sealing mechanism comprises a furnace core and an annular sealing abutting block, a plurality of first clamping blocks are fixedly arranged outside the furnace core, and a sliding clamping groove facilitating movement of the furnace core is formed in the furnace door. A U-shaped block for limiting the limiting position of movement of the furnace core is fixedly arranged on one side of the sliding clamping groove, a second sealing ring is fixedly arranged on the furnace core, and a second annular groove matched with the second sealing ring is formed in the annular sealing abutting block. According to the door body locking structure of the vacuum gas quenching furnace, through the design of a secondary sealing mechanism, on the premise that the first sealing ring is not replaced in advance, the sealing performance between the furnace door and the hearth is improved through tight attachment of the door core and the annular sealing abutting block.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum air quenching furnaces, in particular to a door locking structure of a vacuum air quenching furnace. Background Art

[0002] The vacuum gas quenching furnace is a high-pressure gas quenching vacuum furnace, which is mainly composed of a furnace body, a door body, a heating structure and a vacuum pumping structure. The door body and the furnace body need to be locked by a locking structure to ensure that outside air does not enter the furnace body and to prevent the temperature inside the furnace body from dissipating to the outside.

[0003] The locking structure of the vacuum gas quenching furnace door in the prior art mostly uses a locking ring between the furnace body and the furnace door for bidirectional sealing, wherein the sealing ring is installed in the groove of the furnace door flange to ensure the sealing of the vacuum gas quenching furnace during negative pressure and high pressure air cooling. However, in actual use, we found that the furnace door sealing ring is very easy to age after being used for a period of time, which reduces the sealing between the vacuum gas quenching furnace door and the furnace body, thereby reducing the vacuum degree inside the vacuum gas quenching furnace. Since the vacuum degree inside the vacuum gas quenching furnace only needs to be maintained within a certain range of values, the heat treatment of the workpiece to be processed can still be completed. Therefore, the staff often does not replace the aged sealing ring to reduce the production cost of the workpiece to be processed. However, when the workpiece to be processed with a higher vacuum degree requirement needs to be heat treated, the staff must replace the aged sealing ring so that the vacuum gas quenching furnace can maintain a higher vacuum degree. This results in the sealing ring that can still be used being replaced in advance, which invisibly increases the production cost of the workpiece to be processed. At the same time, the time for replacing the sealing ring will also affect the efficiency of the heat treatment of the workpiece to be processed, and the practical performance of the device is poor.

[0004] To this end, we designed a door locking structure for a vacuum gas quenching furnace to provide another technical solution to the above technical problem. Utility Model Content

[0005] Based on this, it is necessary to provide a door locking structure for a vacuum quenching furnace that is convenient for making full use of the sealing ring and can adjust the vacuum degree inside the furnace body according to the different materials of the workpiece to be processed, in order to solve the above technical problems.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A door locking structure of a vacuum quenching furnace, comprising a furnace body, a flange and a furnace door. The flange is fixedly sleeved at the end of the furnace body. The furnace door is hinged to the furnace body. A plurality of lock rings are evenly distributed on the furnace door. A plurality of lock grooves matching the lock rings are formed on the flange. A first sealing ring is provided on the furnace door. An annular groove I matching the first sealing ring is formed on the flange. A secondary sealing mechanism for sealing the furnace chamber is provided on the furnace body and the furnace door. The secondary sealing mechanism comprises a furnace core and an annular sealing abutting block. A plurality of first clamping blocks are fixedly arranged on the outer part of the furnace core. A sliding clamping groove for facilitating the movement of the furnace core is formed on the furnace door. A U-shaped block for limiting the extreme position of the movement of the furnace core is fixedly arranged on one side of the sliding clamping groove. The furnace core is movably clamped on the furnace door through the first clamping blocks. The annular sealing abutting block is fixedly arranged at the outer end of the furnace body. A second sealing ring is fixedly arranged on the furnace core. An annular groove II matching the second sealing ring is formed on the annular sealing abutting block.

[0008] Preferably, the secondary sealing mechanism comprises a pressing component and an elastic plugging component. The pressing component comprises a plurality of sleeves arranged on one side of the furnace core. The plurality of sleeves are rotatably connected to the furnace door. A driving gear is fixedly connected to the sleeve located in the middle. A plurality of driven gears are meshed outside the driving gear. The plurality of driven gears are respectively fixedly connected to one side of the remaining sleeves. A plurality of first reinforcing rings are rotatably connected to the outside of the plurality of sleeves. A connecting rod I for strengthening the connection strength is fixedly connected between the plurality of first reinforcing rings. The connecting rod I is fixedly abutted against the inside of the furnace door. A threaded abutting rod is threadedly connected to the inside of the sleeve. The end of the threaded abutting rod is rotatably connected to one side of the furnace core.

[0009] Preferably, the elastic plugging component comprises a plug rod slidably clamped inside the sleeve. A plurality of second clamping blocks are fixedly connected to one end of the plug rod close to the sleeve. An installation hole matching the plug rod and the second clamping blocks is formed on the furnace door. A clamping groove matching the second clamping blocks is arranged inside the sleeve. A planetary gear set is fixedly connected to one end of the plug rod away from the clamping groove. A cylindrical installation sleeve for facilitating the installation of the planetary gear set is fixedly connected to the furnace door. The input end of the planetary gear set penetrates through the cylindrical installation sleeve and is connected with a locking handle.

[0010] Preferably, a plurality of third clamping blocks are fixedly connected to the outer part of the tooth ring of the planetary gear set. A limiting clamping groove matching the third clamping blocks is arranged on the cylindrical installation sleeve. A plurality of connecting rods II are fixedly connected to one side of the third clamping blocks close to the locking handle. A second reinforcing ring is rotatably connected to the input end of the planetary gear set located inside the cylindrical installation sleeve. The plurality of connecting rods II are fixedly connected to the reinforcing ring.

[0011] Preferably, a compression spring is provided on one side of the mounting hole close to the planetary gear set. The compression spring is sleeved outside the plug rod. An annular abutting block for abutting against the compression spring is fixedly arranged on the plug rod. Two ends of the compression spring are respectively fixedly connected with the inner wall of the mounting hole and the side wall of the annular abutting block.

[0012] Preferably, one side of the clamping groove close to the planetary gear set is designed as an annular groove section matching the second clamping block.

[0013] It can be undoubtedly seen that through the above technical solution of the present application, the technical problems to be solved by the present application can surely be solved.

[0014] Meanwhile, through the above technical solution, the present utility model at least has the following beneficial effects:

[0015] 1. A door body locking structure of a vacuum quenching furnace provided by the present utility model, through the design of the secondary sealing mechanism, on the premise of not replacing the first sealing ring in advance, through the close fit between the door core and the annular sealing abutting block, the sealing performance between the furnace door and the furnace chamber is improved, so that the vacuum degree in the furnace chamber is significantly improved, so as to realize the heat treatment of workpieces to be processed with higher requirements for vacuum degree, and the practical performance of the device is improved.

[0016] 2. A door body locking structure of a vacuum quenching furnace provided by the present utility model, through the design of the elastic plugging component, controls the sealing state between the door core and the annular sealing abutting block, avoids the influence of the locking handle on the sealing degree between the door core and the furnace chamber due to accidental touch by external staff, and improves the actual use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0018] Figure 1 It is an axonometric structural schematic diagram of the closed state of the furnace door of the present utility model;

[0019] Figure 2 It is an axonometric structural schematic diagram of the opened state of the furnace door of the present utility model;

[0020] Figure 3 It is a split structural schematic diagram of the secondary sealing mechanism of the present utility model;

[0021] Figure 4 It is a half-sectional structural schematic diagram of the furnace door of the present utility model;

[0022] Figure 5 Schematic half-sectional view of the secondary sealing mechanism of the present utility model;

[0023] Figure 6 Of the present utility model Figure 5 Schematic view of the structure at position A in

[0024] In the figure: 1, furnace body; 2, flange; 3, furnace door; 4, lock ring; 5, lock groove; 6, first sealing ring; 7, first annular groove; 8, furnace core; 9, annular sealing abutting block; 10, first clamping block; 11, sliding clamping groove; 12, U-shaped block; 13, second sealing ring; 14, second annular groove; 15, sleeve; 16, driving gear; 17, driven gear; 18, first reinforcing ring; 19, first connecting rod; 20, threaded abutting rod; 21, inserting rod; 22, second clamping block; 23, mounting hole; 24, clamping groove; 25, planetary gear set; 26, cylindrical mounting sleeve; 27, locking handle; 28, third clamping block; 29, limiting clamping groove; 30, second connecting rod; 31, second reinforcing ring; 32, compression spring; 33, annular abutting block. Specific embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] Embodiment

[0027] Referring to Figures 1-6 , a door body locking structure of a vacuum quenching furnace, comprising a furnace body 1, a flange 2 and a furnace door 3. The flange 2 is fixedly sleeved at the end of the furnace body 1. The furnace door 3 is hinged to the furnace body 1. A plurality of lock rings 4 are evenly distributed on the furnace door 3. A plurality of lock grooves 5 matching the lock rings 4 are formed on the flange 2. A first sealing ring 6 is provided on the furnace door 3. A first annular groove 7 matching the first sealing ring 6 is formed on the flange 2. A secondary sealing mechanism for sealing the furnace chamber is provided on the furnace body 1 and the furnace door 3. The secondary sealing mechanism comprises a furnace core 8 and an annular sealing abutting block 9. A plurality of first clamping blocks 10 are fixedly arranged on the outer part of the furnace core 8. A sliding clamping groove 11 facilitating the movement of the furnace core 8 is formed on the furnace door 3. A U-shaped block 12 for limiting the extreme position of the movement of the furnace core 8 is fixedly arranged on one side of the sliding clamping groove 11. The furnace core 8 is movably clamped on the furnace door 3 through the first clamping blocks 10. The annular sealing abutting block 9 is fixedly arranged at the outer end of the furnace body 1. A second sealing ring 13 is fixedly arranged on the furnace core 8. A second annular groove 14 matching the second sealing ring 13 is provided on the annular sealing abutting block 9.

[0028] Through the design of the secondary sealing mechanism, under the premise of ensuring that the sealing ring 6 is not replaced in advance, the tight fit between the door core and the annular sealing block 9 is improved to improve the sealing between the furnace door 3 and the furnace, so that the vacuum degree in the furnace is significantly improved, so as to achieve heat treatment of the workpiece with high vacuum requirements, thereby improving the practical performance of the device.

[0029] Reference Figures 2-4 The secondary sealing mechanism includes a tightening component and an elastic plug-in component. The tightening component includes a plurality of sleeves 15 arranged on one side of the furnace core 8. The plurality of sleeves 15 are rotatably connected to the furnace door 3, wherein the sleeve 15 located in the middle is fixedly connected with a driving gear 16, and the outside of the driving gear 16 is meshed with a plurality of driven gears 17, and the plurality of driven gears 17 are respectively fixedly connected to one side of the remaining sleeves 15, and the outsides of the plurality of sleeves 15 are rotatably connected with a reinforcing ring 18, and a connecting rod 19 for strengthening the connection strength is fixedly connected between the plurality of reinforcing rings 18, and the connecting rod 19 is fixedly abutted against the inside of the furnace door 3, and the inside of the sleeve 15 is threadedly connected with a threaded push rod 20, and the end of the threaded push rod 20 is rotatably connected to one side of the furnace core 8. Specifically, through the design of the tightening component, the staff only needs to rotate the sleeve 15 located in the middle, that is, The engagement between the driving gear 16 and the driven gear 17 can drive multiple sleeves 15 to rotate synchronously, so that the threaded push rod 20 inside the sleeve 15 is pushed outward, and the furnace core 8 is pushed toward the annular sealing push block 9, so that the sealing ring 2 13 fixed on the furnace core 8 is embedded in the annular groove 2 14, and the furnace core 8 and the annular sealing push block 9 are firmly abutted, so that the furnace core 8 and the sealing ring 2 13 and the annular sealing push block 9 can be sealed. Connection between the furnace core 8 and the annular sealing push block 9 can be achieved, thereby improving the sealing between the furnace door 3 and the furnace chamber without replacing the sealing ring 16, and significantly improving the vacuum degree in the furnace chamber of the vacuum gas quenching furnace, so as to achieve heat treatment of workpieces to be processed with high requirements for vacuum degree, and effectively improve the practical performance of the device; by strengthening the design of the ring 18 and the connecting rod 19, the stability of the sleeve 15 during rotation is improved, and unnecessary shaking of the sleeve 15 during rotation is avoided, thereby further improving the practical performance of the device.

[0030] Reference Figures 4-6, the elastic plug-in component includes a plug rod 21 that is slidably clamped inside the sleeve 15. One end of the plug rod 21 close to the sleeve 15 is fixedly connected with a plurality of second clamping blocks 22. An installation hole 23 matching the plug rod 21 and the second clamping blocks 22 is formed in the furnace door 3. A clamping groove 24 matching the second clamping blocks 22 is arranged inside the sleeve 15. One end of the plug rod 21 far from the clamping groove 24 is fixedly connected with a planetary gear set 25. A cylindrical installation sleeve 26 facilitating the installation of the planetary gear set 25 is fixedly connected to the furnace door 3. The input end of the planetary gear set 25 penetrates through the cylindrical installation sleeve 26 and is connected with a locking handle 27. Specifically, through the design of the plug rod 21, the second clamping blocks 22, the installation hole 23, the clamping groove 24, the planetary gear set 25, the cylindrical installation sleeve 26 and the locking handle 27, the staff only needs to press the locking handle 27 inward to insert the second clamping blocks 22 on the plug rod 21 into the clamping groove 24, and then rotate the locking handle 27 to drive the sleeve 15 rotatably connected inside the furnace door 3 to rotate, so that the threaded abutting rod 20 threadedly connected inside the sleeve 15 abuts outward, and the furnace core 8 slidably clamped inside the furnace door 3 is pushed towards the annular sealing abutting block 9 to complete the secondary sealing between the furnace door 3 and the furnace chamber. At the same time, through the design of the planetary gear set 25, the output torque applied by the staff rotating the locking handle 27 to the plug rod 21 is effectively increased, thereby reducing the force required for the staff to rotate the locking handle 27 and improving the practical performance of the device.

[0031] Refer to Figures 5-6 , a plurality of third clamping blocks 28 are fixedly connected to the outer part of the gear ring of the planetary gear set 25. A limiting clamping groove 29 matching the third clamping blocks 28 is arranged on the cylindrical installation sleeve 26. A plurality of second connecting rods 30 are fixedly connected to one side of the third clamping blocks 28 close to the locking handle 27. A second reinforcing ring 31 is rotatably connected to the input end of the planetary gear set 25 located inside the cylindrical installation sleeve 26. The plurality of second connecting rods 30 are fixedly connected to the reinforcing ring. Specifically, through the design of the third clamping blocks 28, the limiting clamping groove 29, the second connecting rods 30 and the reinforcing ring, when the staff presses the locking handle 27 inward, the planetary gear set 25 can move inward synchronously inside the cylindrical installation sleeve 26 following the pressing of the locking handle 27, thereby preventing the planetary gear set 25 from separating from each other due to the inward pressing of the locking handle 27 and effectively ensuring the stable operation of the secondary sealing mechanism.

[0032] Refer to Figures 5-6, a compression spring 32 is provided on one side of the mounting hole 23 close to the planetary gear set 25. The compression spring 32 is sleeved outside the plug rod 21. An annular abutting block 33 that abuts against the compression spring 32 is fixedly provided on the plug rod 21. Two ends of the compression spring 32 are respectively fixedly connected to the inner wall of the mounting hole 23 and the side wall of the annular abutting block 33. One side of the card slot 24 close to the planetary gear set 25 is designed as a circular groove section matching the second card block 22. Specifically, through the design of the compression spring 32 and the annular abutting block 33, after the door core is tightly abutted against one side of the annular sealing abutting block 9 by the staff to form a seal for the furnace chamber, the plug rod 21 and the second card block 22 can move outwards under the action of the compression spring 32, so that the second card block 22 moves outwards along the card slot 24 and is placed in a circular groove section of the card slot 24, so as to release the clamping connection between the plug rod 21 and the sleeve 15. At this time, even if the staff accidentally touches the locking handle 27 and makes it rotate, since there is no clamping connection between the plug rod 21 and the sleeve 15, even if the plug rod 21 rotates, the sleeve 15 will not rotate, thus effectively avoiding the influence on the sealing degree between the door core and the furnace chamber caused by the accidental touch of external staff and improving the actual use effect of the device.

[0033] The using process of a door body locking structure of a vacuum quenching furnace provided by the utility model is as follows:

[0034] When the requirements for the vacuum degree of the workpiece to be processed are not high, the staff can directly close the furnace door 3, make the lock ring 4 snap into the lock slot 5 and make the first sealing ring 6 arranged on the furnace door 3 embed into the first annular groove 7. After the furnace chamber of the vacuum quenching furnace is evacuated, subsequent heat treatment can be carried out on the workpiece to be processed;

[0035] When the workpiece to be processed has a high requirement for vacuum degree, the staff can close the furnace door 3, make the lock ring 4 snap into the lock groove 5 and make the sealing ring I 6 arranged on the furnace door 3 embed into the annular groove I 7. Then, the staff presses the locking handle 27 inward to drive the planetary gear set 25 and the inserting rod 21 to move synchronously inside the cylindrical mounting sleeve 26, and makes the second latch 22 on the inserting rod 21 insert into the clamping groove 24 opened inside the sleeve 15. During the process of pressing the locking handle 27 inward, the staff can slightly adjust the angle at which the inserting rod 21 and the second latch 22 insert into the sleeve 15 to adjust the angle at which the locking handle 27 rotates due to accidental touch, so that the second latch inserts into the clamping groove 24 and then rotates the locking handle 27, and drives the inserting rod 21 to rotate through the planetary gear set 25 connected to the end of the locking handle 27, thereby driving the sleeve 15 clamped with the inserting rod 21 to rotate, and driving the driven gear 17 meshed with it to rotate through the driving gear 16 fixedly connected to the outside of the sleeve 15. Then, through the rotation of the driven gear 17, a plurality of sleeves 15 are driven to rotate synchronously, so that the threaded abutting rod 20 inside the sleeve 15 abuts outwards, and pushes the furnace core 8 towards the annular sealing abutting block 9, makes the sealing ring II 13 fixedly arranged on the furnace core 8 embed into the annular groove II 14, and makes the furnace core 8 firmly abut against the annular sealing abutting block 9 to form a secondary seal for the furnace chamber. At this time, the staff can stop pressing the locking handle 27, and the locking handle 27, the planetary gear set 25, the inserting rod 21 and the second latch 22 will pop outwards under the action of the compression spring 32, thereby releasing the clamping state between the inserting rod 21 and the sleeve 15. Then, evacuate the furnace chamber to perform heat treatment on the workpiece to be processed with a high requirement for vacuum degree. When the heat treatment of the workpiece to be processed is completed, the staff can press the locking handle 27 inward again to make the inserting rod 21 and the second latch 22 re-insert into the clamping groove 24 to be clamped with the sleeve 15, and then rotate the locking handle 27 to make the threaded abutting rod 20 inside the sleeve 15 retract inwards, and then drive the furnace core 8 to move outwards, so that the furnace core 8 is separated from the annular sealing abutting block 9 for the normal use of the secondary sealing mechanism next time. Then, open the furnace door 3 and take out the heat-treated workpiece to be processed.

[0036] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A door locking structure for a vacuum gas quenching furnace, comprising a furnace body (1), a flange (2) and a furnace door (3), wherein the flange (2) is fixedly sleeved on the end of the furnace body (1), the furnace door (3) is hingedly connected to the furnace body (1), a plurality of locking rings (4) are evenly distributed on the furnace door (3), a plurality of locking grooves (5) matching the locking rings (4) are formed on the flange (2), a sealing ring (6) is provided on the furnace door (3), and an annular groove (7) matching the sealing ring (6) is formed on the flange (2), wherein the structure is characterized in that: The furnace body (1) and the furnace door (3) are provided with a secondary sealing mechanism for sealing the furnace chamber, and the secondary sealing mechanism comprises a furnace core (8) and an annular sealing block (9). A plurality of clamping blocks (10) are fixedly arranged on the outside of the furnace core (8). The furnace door (3) is provided with a sliding clamping groove (11) for facilitating the movement of the furnace core (8). A U-shaped block (12) for limiting the extreme position of the movement of the furnace core (8) is fixedly arranged on one side of the sliding clamping groove (11). The furnace core (8) is movably clamped on the furnace door (3) by the clamping block (10). The annular sealing block (9) is fixedly arranged at the outer end of the furnace body (1). A sealing ring (13) is fixedly arranged on the furnace core (8). The annular sealing block (9) is provided with an annular groove (14) matching the sealing ring (13).

2. The door locking structure of a vacuum gas quenching furnace according to claim 1, characterized in that: The secondary sealing mechanism comprises a tightening assembly and an elastic plug-in assembly, wherein the tightening assembly comprises a plurality of sleeves (15) arranged on one side of the furnace core (8), wherein the plurality of sleeves (15) are rotatably connected to the furnace door (3), wherein a driving gear (16) is fixedly connected to the sleeve (15) located in the middle, wherein the driving gear (16) is externally meshed with a plurality of driven gears (17), wherein the plurality of driven gears (17) are respectively fixedly connected to one side of the remaining sleeves (15), wherein the plurality of sleeves (15) are externally rotatably connected with a reinforcing ring (18), wherein a connecting rod (19) for reinforcing the connection strength is fixedly connected between the plurality of reinforcing rings (18), wherein the connecting rod (19) is fixedly abutted against the inside of the furnace door (3), wherein the inside of the sleeve (15) is threadedly connected with a threaded abutting rod (20), wherein the end of the threaded abutting rod (20) is rotatably connected to one side of the furnace core (8).

3. The door locking structure of a vacuum gas quenching furnace according to claim 2, characterized in that: The elastic plug-in assembly comprises an insertion rod (21) slidably mounted inside the sleeve (15); one end of the insertion rod (21) close to the sleeve (15) is fixedly connected to a plurality of second clamping blocks (22); a mounting hole (23) matching the insertion rod (21) and the second clamping blocks (22) is provided on the furnace door (3); a clamping groove (24) matching the second clamping block (22) is provided inside the sleeve (15); one end of the insertion rod (21) away from the clamping groove (24) is fixedly connected to a planetary gear set (25); a columnar mounting sleeve (26) for facilitating the mounting of the planetary gear set (25) is fixedly connected to the furnace door (3); an input end of the planetary gear set (25) passes through the columnar mounting sleeve (26) and is connected to a locking handle (27).

4. The door locking structure of a vacuum gas quenching furnace according to claim 3, characterized in that: The ring gear of the planetary gear set (25) is fixedly connected to a plurality of clamping blocks three (28) on the outside, the columnar mounting sleeve (26) is provided with a limit clamping groove (29) matching the clamping blocks three (28), a side of the clamping block three (28) close to the locking handle (27) is fixedly connected to a plurality of connecting rods two (30), the input end of the planetary gear set (25) located inside the columnar mounting sleeve (26) is rotatably connected to a reinforcing ring two (31), and the plurality of connecting rods two (30) are fixedly connected to the reinforcing ring.

5. The door locking structure of a vacuum gas quenching furnace according to claim 3, characterized in that: A compression spring (32) is provided on one side of the mounting hole (23) close to the planetary gear set (25); the compression spring (32) is sleeved on the outside of the insertion rod (21); an annular stop block (33) is fixedly provided on the insertion rod (21) for abutting against the compression spring (32); and two ends of the compression spring (32) are respectively fixedly connected to the inner wall of the mounting hole (23) and the side wall of the annular stop block (33).

6. The door locking structure of a vacuum gas quenching furnace according to claim 3, characterized in that: The side of the clamping groove (24) close to the planetary gear set (25) is designed as an annular groove that matches the second clamping block (22).

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