A surface quenching device for small diameter shaft parts

Abstract

The utility model relates to the technical field of heat treatment equipment, and in particular to a surface quenching device for small-diameter shaft parts, including a base frame, on which a rotating device and a push-feed device are arranged in parallel to realize the circumferential rotation and horizontal movement of the shaft parts. Along the travel direction of the shaft parts, the push-feed device is divided into a loading area, a quenching area, and a discharging area; the loading area is provided with a loading rack, a sliding plate, and a lifting device for loading the shaft parts onto the rotating device, and the spacing between the loading rack and the sliding plate is adjustable, which can adapt to the heat treatment of shaft parts with different shaft diameters, and the lifting device lifts the shaft parts onto the rotating device; the quenching area is provided with a quenching device to perform surface heat treatment on the shaft parts; the discharging area is provided with a receiving device, and the receiving box receives the materials, and a water tank is also provided under the base frame to collect the cooling water generated during the heat treatment process.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment equipment, in particular to a surface quenching device for small-diameter shaft parts. Background Art

[0002] In order to improve the surface hardness and strength of metal processing, quenching heat treatment technology is widely used in the mechanical processing industry. The existing surface quenching devices on the market are complex in design and structure, high in cost, and are designed for most general parts. The surface quenching of small-diameter shaft workpieces will result in uneven quenching and poor results. In addition, the shaft diameters and lengths of shaft parts are different, and the debugging time of general quenching devices is long. Therefore, it is necessary to design a special surface quenching device for small-diameter shaft parts to overcome the above problems. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a surface quenching device for small-diameter shaft parts to ensure uniform surface quenching of the shaft parts and good heat treatment effect.

[0004] The technical solution adopted by the utility model is:

[0005] A surface quenching device for small-diameter shaft parts includes a base frame, on which a rotating device, a material pushing and feeding device, a quenching device, a loading device, a material receiving device, and a water tank are arranged. The rotating device and the material pushing and feeding device are arranged side by side on the base frame. The rotating device includes rollers, and two groups of rollers are arranged side by side on the base frame. The rollers are driven by a sprocket transmission system. The rotating device is sequentially provided with a loading area I, a quenching area II, and a discharging area III along the length direction of the rollers.

[0006] The push feeding device includes a hydraulic cylinder, the output direction of the hydraulic cylinder output shaft is toward the loading area I, an adjustable push assembly is arranged at the shaft end of the hydraulic cylinder, the adjustable push assembly includes a mounting base plate, an adjustment plate, a cantilever frame, and a push head, an adjustment plate is arranged on the mounting base plate, a cantilever frame is arranged on the adjustment plate, the cantilever frame is an L-shaped cantilever frame, including a vertical pole and a transverse suspension rod, the vertical pole is fixedly arranged on the adjustment plate, the transverse suspension rod is suspended above two sets of rollers, a sleeve is arranged at the end of the transverse suspension rod, and a push head is slidably arranged in the sleeve.

[0007] A loading device is provided at the loading area (Ⅰ), and the loading device includes a loading rack, a sliding plate, and a lifting device. The loading rack is arranged on one side of the roller shaft and fixedly arranged on the side of the bottom frame. The sliding plate is arranged above the outer side roller shaft. A lifting device is arranged between the sliding plate and the loading rack, and the distance between the loading rack and the sliding plate is adjustable.

[0008] The material receiving device includes a receiving device and a material receiving box. The receiving device is arranged at the tail end of the roller shaft. The receiving device includes a mounting bracket, a blanking plate, a receiving plate, and a receiving plate adjustment plate. The mounting bracket is fixedly arranged on the base frame, the blanking plate is obliquely arranged on the mounting bracket, the material receiving box is arranged at the bottom of the inclined end of the blanking plate, a vertically penetrating sliding groove is arranged on the blanking plate, a receiving plate adjustment plate is vertically arranged downward along the inner wall of one side of the sliding groove, the receiving plate is arranged in the sliding groove, and the receiving plate is fixedly arranged on the receiving plate adjustment plate.

[0009] The pusher head comprises a slide bar, a stud and a push rod. The stud is arranged at the lower end of the slide bar. The stud is arranged horizontally. The push rod is arranged at the end of the stud. The push rod is suspended above the center position of the two roller shafts.

[0010] A concave sliding groove is arranged on the installation bottom plate, and the adjustment plate is arranged in the concave sliding groove.

[0011] The loading rack includes a loading chute plate, which is an inclined slide chute plate, and its inclination direction is toward the sliding plate. A first leg and a second leg are arranged below the loading chute plate. The bottom of the first leg is arranged on the horizontal ground, and the bottom of the second leg is arranged on the base frame. The installation position of the second leg on the base frame is adjustable.

[0012] The lifting device includes a lifting cylinder, a mounting seat, a lifting plate, and an auxiliary plate. The lifting cylinder is fixedly arranged on the mounting seat, the mounting seat is fixedly arranged on the base frame, the output direction of the output shaft of the lifting cylinder is arranged upward, a lifting plate is arranged at the end of the output shaft, and the lifting plate is arranged between the feeding trough plate and the sliding plate.

[0013] The top end surface of the top plate is provided with an inclined surface, and the inclined direction of the inclined surface is toward the sliding plate.

[0014] Auxiliary plates can also be arranged on the side walls of the top plate, and the auxiliary plates are arranged in matching with the top plate to adapt to shaft parts with different diameters.

[0015] A protective cover is arranged on the roller shaft of the rotating device located at the quenching zone II. The protective cover is provided with two cavities: a first cavity and a second cavity. The first cavity is a heat treatment cavity, and the second cavity is a shaft parts discharge area.

[0016] A plurality of water leakage holes are also arranged on the blanking plate.

[0017] Beneficial effects of the utility model:

[0018] The utility model discloses a surface quenching device for small-diameter shaft parts, wherein a rotating device and a pushing feeding device are arranged side by side on a base frame, and the two realize two operating modes of the shaft parts: circumferential rotation and linear displacement. Along the traveling direction of the shaft parts, the pushing device is provided with a loading area, a quenching area and a discharging area; the loading area is provided with a loading rack, a sliding plate and a lifting device, and the spacing between the loading rack and the sliding plate is adjustable, which can adapt to the heat treatment operation of shaft parts with different shaft diameters, and the lifting device lifts the shaft parts onto the rotating device; the quenching area is provided with quenching equipment; the discharging area is provided with a receiving device, and the receiving box receives the materials. The device has a simple structure, low cost, is easy to operate and maintain, and can perform heat treatment operations on various types of shaft parts, thereby reducing production costs and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the following is a preferred embodiment, and is accompanied by the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the utility model. For ordinary technicians in this field, other drawings can be obtained based on the following drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure;

[0021] Figure 2 It is a schematic diagram of the structure of the rotating device and the push feeding device;

[0022] Figure 3 for Figure 1 Top view;

[0023] Figure 4 It is a schematic diagram of the structure of the pusher assembly;

[0024] Figure 5 It is a schematic diagram of the structure of the loading rack;

[0025] Figure 6 This is a schematic diagram of the loading rack installation structure;

[0026] Figure 7 Schematic diagram of the top material device structure Figure 1 ;

[0027] Figure 8 Schematic diagram of the installation structure of the lifting device and loading rack Figure 1 ;

[0028] Fig. 9 Schematic diagram of the top material device structure Figure 2 ;

[0029] Fig.10 Schematic diagram of the installation structure of the lifting device and loading rack Figure 2 ;

[0030] Fig.11 This is a schematic diagram of the installation structure of the roller and induction coil;

[0031] Fig.12 It is a schematic diagram of the structure of the receiving device.

[0032] In the figure: 1-base frame, 2-rotating device, 201-roller, 2011-avoidance ring groove, 202-seat bearing, 203-first sprocket, 204-motor, 205-second sprocket, 3-push feeding device, 301-hydraulic cylinder, 302-connecting plate, 303-adjusting push assembly, 3031-mounting base plate, 30311-concave slide groove, 3032-adjusting plate, 3033-cantilever frame, 3034-sleeve, 3035-slide rod, 3036-stud, 3037-push rod, 304-linear guide rail group, 4-quenching equipment, 401-induction coil, 5-loading rack, 501-first leg, 502- The second leg, 503-feeding trough plate, 504-mounting base plate 505-supporting and fixing plate, 5051-long slot hole, 6-sliding plate, 7-lifting device, 701-lifting cylinder, 702-mounting seat, 703-top plate, 7031-inclined surface, 704-auxiliary plate, 8-receiving device, 801-mounting bracket, 802-blank plate, 8021-sliding groove, 8022-leakage hole, 803-receiving plate, 804-receiving plate adjustment plate, 9-receiving box, 10-water tank, 11-protective cover, 1101-first cavity, 1102-second cavity, Ⅰ-feeding area, Ⅱ-quenching area, Ⅲ-discharging area, W-thickness size. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0035] like Figure 1 , Figure 3As shown, a surface quenching device for small-diameter shaft parts includes a base frame 1, on which a rotating device 2, a pushing and feeding device 3, a quenching device 4, a loading device, a receiving device, and a water tank 10 are arranged. The base frame 1 is used to install, support and fix various functional components; the rotating device 2 and the push-feed device 3 are arranged side by side on the base frame 1, and the rotating device 2 is used to realize the circumferential rotation of the shaft parts; the push-feed device 3 is used to realize the horizontal movement of the shaft parts; along the travel direction of the shaft parts, the push-feed device is divided into a loading area I, a quenching area II, and a discharging area III, and the loading device is arranged in the loading area I. The loading device includes: a loading rack 5, a sliding plate 6, and a top feeding device 7, which are used to load the shaft parts onto the rotating device 2; the quenching equipment 4 is arranged in the quenching area II, which is used to perform heat treatment operations on the surface of the shaft parts; the receiving device is arranged in the discharging area III, and the receiving device includes a receiving device 8 and a receiving box 9, which are used to receive the shaft parts after heat treatment; a water tank 10 is arranged under the base frame for collecting cooling water generated during the heat treatment process.

[0036] like Figure 2 As shown, the rotating device 2 is a sprocket transmission device, including rollers 201, two groups of rollers 201 are arranged side by side on the base frame 1, a group of seat bearings 202 are arranged at both ends of the rollers 201, and the seat bearings 202 are fixedly arranged on the base frame 1. A first sprocket 203 is also arranged at one end of the roller 201, and a motor 204 is arranged below the roller 201, and the motor 204 is fixedly arranged on the base frame 1. A second sprocket 205 is arranged at the output shaft end of the motor 204, and the second sprocket 205 and the first sprocket 203 are matched. The sprocket transmission makes the two groups of rollers 201 rotate in the circumferential direction. The shaft parts are placed between the two groups of rollers 201, and rotate in the circumferential direction with the two groups of rollers 201. The distance between the two groups of rollers 201 can be adjusted to adapt to the diameter of the shaft parts.

[0037] like Figures 2 to 4 As shown, a push material feeding device 3 is provided on the side of the rotating device 2. The push material feeding device 3 is a feeding mechanism that is hydraulically driven and coordinated with a linear guide rail. The push material feeding device 3 includes a hydraulic cylinder 301, which is fixedly arranged on the base frame 1, and the output direction of the output shaft of the hydraulic cylinder 301 is toward the feeding area I of the roller 201. A connecting plate 302 is provided at the output shaft end of the hydraulic cylinder 301, and an adjusting push material assembly 303 is provided at the end of the connecting plate 302, and the adjusting push material assembly 303 is arranged on the linear guide rail group 304. The hydraulic cylinder 301 can drive the adjusting push material assembly 303 to move its position on the linear guide rail group 304.

[0038] like Figure 4As shown, the adjusting and pushing assembly 303 includes a mounting base plate 3031, an adjusting plate 3032, a cantilever frame 3033, and a pushing head. The mounting base 3031 is fixedly set on the slider of the linear guide group 304, and an adjustment plate 3032 is set on the mounting base 3031, and a cantilever frame 3033 is set on the adjustment plate 3032. The cantilever frame 3033 is an L-shaped cantilever frame, including a vertical pole and a transverse suspension rod. The vertical pole is fixedly set on the adjustment plate 3032, and the transverse suspension rod is suspended above the two groups of roller shafts 201. A sleeve 3034 is set at the end of the transverse suspension rod, and a push head is slidably set in the sleeve 3034. The height position of the push head can be adjusted up and down. The push head includes a sliding rod 3035, a stud 3036, and a push rod 3037. The lower end of the sliding rod 3035 is set with a stud 3036, and the stud 3036 is set horizontally. A push rod 3037 is set at the end of the stud 3036, and the push rod 3037 is suspended above the center position of the two roller shafts 201. When the hydraulic cylinder 301 is running, the push rod 3037 can push the shaft parts supported between the two roller shafts 201 to move toward the quenching zone II and the discharge zone III.

[0039] like Figure 4 As shown, a concave groove 30311 is provided on the mounting base 3031, and an adjustment plate 3032 is provided in the concave groove 30311. The adjustment plate 3032 can be adjusted in position in the concave groove 30311 to match the position of the push rod 3037 with the shaft part supported between the two roller shafts 201.

[0040] like Figure 1 , Figure 5 As shown, a feeding device is provided at the feeding area I of the roller 201, and the feeding device includes a feeding frame 5, a sliding plate 6, and a lifting device 7. The feeding frame 5 is provided on one side of the outer side roller 201, and a sliding plate 6 is also provided above the outer side roller 201. The top of the sliding plate 6 is an inclined structure, and the inclined direction is inclined toward the center of the two groups of rollers 201, which is used to slide the shaft parts to the two rollers 201. A lifting device 7 is provided between the sliding plate 6 and the feeding frame 5, which is used to receive the shaft parts that slide down from the feeding frame 5 and lift the shaft parts onto the sliding plate 6.

[0041] like Figure 5 As shown, the loading rack 5 includes a first leg 501, a second leg 502, and a loading chute plate 503. The loading chute plate 503 is an inclined chute plate, and its inclination direction is toward the sliding plate 6. The first leg 501 and the second leg 502 are arranged below the loading chute plate 503. The length of the first leg 501 is greater than the length of the second leg 502. The bottom of the first leg 501 is arranged on the horizontal ground, and the bottom of the second leg 502 is arranged on the bottom frame 1. A mounting base plate 504 is fixedly arranged at the bottom of the second leg 502, and a support fixing plate 505 is arranged below the mounting base plate 504. The support fixing plate 505 is fixedly arranged on the bottom frame 1. As shown in FIG. Figure 6As shown, a long slot hole 5051 is provided on the supporting fixing plate 505 , and the mounting base plate 504 can adjust its mounting position along the long slot hole 5051 , that is, the loading rack 5 can be adjusted forward and backward by a certain distance to match the setting of the lifting device 7 .

[0042] like Figure 7 As shown, the material ejection device 7 includes a lifting cylinder 701, a mounting seat 702, a top plate 703, and an auxiliary plate 704. The lifting cylinder 701 is fixedly mounted on the mounting seat 702, and the mounting seat 702 is fixedly mounted on the base frame 1. The output shaft of the lifting cylinder 701 is arranged in an upward direction, and a top plate 703 is arranged at the output shaft end of the lifting cylinder 701. The top plate 703 is arranged between the feeding chute plate 503 and the slide plate 6. Figure 8 As shown, the thickness dimension W of the top plate 703 is set to match the diameter of the shaft part, and the thickness dimension W is slightly larger than the diameter of the shaft part. The thickness dimension W of the top plate 703 matches the spacing between the upper trough plate 503 and the slide plate 6. The shaft part placed on the upper trough plate 503 slides along the inclined surface to the slide plate 6, and the bottom of the shaft part contacts the top plate 703. The top plate 703 lifts the shaft part, and the shaft part slides along the inclined surface of the slide plate 6 to the center of the two roller shafts 201.

[0043] like Figure 7 , Figure 8 As shown, an inclined surface 7031 is provided on the top end surface of the top plate 703, and the inclined direction of the inclined surface 7031 is toward the slide plate 6 to prevent the shaft parts from rolling toward the upper trough plate 503 during the upward lifting process.

[0044] like Fig. 9 , Fig.10 As shown, in order to increase the diversity of heat-treated shaft parts of the device, that is, to adapt to the heat treatment of shaft parts with different diameters, the side wall of the top plate 703 can also be provided with an auxiliary plate 704, and the top plate 703 and the auxiliary plate 704 are matched to change the thickness W of the top plate to adapt to the diameter of the shaft parts. At the same time, the feeding rack 5 is dragged outward to adjust the distance between the end of the feeding chute plate 503 and the sliding plate 6 to match the thickness W of the top plate.

[0045] like Figure 1 , Figure 3 As shown, the quenching zone II is provided with a quenching device 4, and the quenching device 4 is provided with an induction coil 401, and the induction coil 401 includes an inductor and a matching water spraying device, such as Fig.11As shown, the induction coil 401 cantilever extends to the center of the two groups of rollers 201, and the end of the induction coil 401 is a circular ring structure, which is arranged on the passage of the shaft parts on the two groups of rollers 201. The shaft parts pass through the circular ring channel at the end of the induction coil 401 for quenching. The roller 201 is provided with a avoiding ring groove 2011 at the circular ring structure at the end of the induction coil 401, so that the circular ring channel is located on the passage of the shaft parts on the two groups of rollers 201.

[0046] Since the quenching equipment 4 and the induction coil 401 are common heat treatment equipment and accessories, their structures are not described in detail here.

[0047] like Figure 1 As shown, a protective cover 11 is provided on the roller 201 of the rotating device 2 located at the quenching zone II, and the protective cover 11 is provided with two cavities: a first cavity 1101 and a second cavity 1102. The first cavity is a heat treatment cavity, and the induction coil 401 is arranged in the cavity to prevent cooling water from splashing during heat treatment. The second cavity is a shaft parts discharge area, which isolates the heat-treated shaft parts from the cooling water sprayed by the heat treatment in the first cavity 1101, and further separates the parts from the surface moisture.

[0048] like Figure 1 , Figure 3 As shown, the material discharging area III is provided with a material receiving device, which includes a receiving device 8 and a material receiving box 9. The receiving device 8 is provided at the rear end of the roller shaft 201. Fig.12 As shown, the receiving device 8 includes a mounting bracket 801, a blanking plate 802, a receiving plate 803, and a receiving plate adjusting plate 804. The mounting bracket 801 is fixedly arranged on the base frame 1, the blanking plate 802 is tiltedly arranged on the mounting bracket 801, and the receiving box 9 is arranged at the bottom of the tilted end of the blanking plate 802. A vertically penetrating sliding groove 8021 is arranged on the blanking plate 802, and a receiving plate adjusting plate 804 is arranged vertically downward along the inner wall of one side of the sliding groove 8021. A receiving plate 803 is arranged in the sliding groove 8021, and the receiving plate 803 is arranged on the receiving plate adjusting plate 804. The receiving plate 803 is arranged at the end shaft part outlet near the roller shaft 201. The receiving plate 803 is an L-shaped structure, the vertical plate is inserted in the sliding groove 8021, and the horizontal plate is used to receive the shaft parts. The blanking plate 802 is also provided with a plurality of water leakage holes 8022 for leaking the residual water on the shaft parts into the water tank 10 .

[0049] like Figure 1 , Figure 3 As shown, a water tank 10 is arranged below the rotating device 2, and the water tank 10 is arranged on the base frame 1. The length of the water tank 10 covers the quenching area II and the discharge area III, and is used to receive the water leaked from this area and recycle it.

[0050] During operation, the shaft parts to be heat treated are placed on the loading trough plate 503 of the loading rack 5 in sequence, the lifting cylinder 701 provided in the lifting device 7 pushes upward, the top plate 703 is lifted, and the shaft parts placed on the top plate 703 are lifted to the sliding plate 6, and the shaft parts roll along the inclined surface of the sliding plate 6 to between the two groups of rollers 201, the rotating device 2 is started, the two groups of rollers 201 rotate circumferentially, and the shaft parts rotate circumferentially with the rollers 201, the pushing feeding device 3 is started, and the hydraulic cylinder 301 drives the adjustment device provided on the pushing assembly 303. The pushing head pushes the shaft part from the entrance of the shield 11 and moves to the quenching equipment 4. The shaft part passes through the induction coil 401 at a certain rotational speed and translational speed to complete the heat treatment process. The pushing head continues to move and pushes the shaft part, and pushes it out from the outlet of the shield 11 and enters the receiving plate 803 set on the receiving device 8, slides from the receiving plate 803 to the blanking plate 802, and rolls along the inclined surface of the blanking plate 802 to the receiving box 9. At the same time, the push feeding device 3 is reset to the loading area I to start the heat treatment operation of the next shaft part.

Claims

1. A surface quenching device for small-diameter shaft parts, comprising a base frame (1), on which a rotating device (2), a material pushing and feeding device (3), a quenching device (4), a material loading device, a material receiving device, and a water tank (10) are arranged, characterized in that: The rotating device (2) and the material pushing and feeding device (3) are arranged side by side on the base frame (1); The rotating device (2) comprises rollers (201), wherein the rollers (201) are provided in two groups, the two groups of rollers (201) are arranged side by side on the base frame (1), the rollers (201) are driven by a sprocket transmission system, and the rotating device (2) is provided with a loading area (I), a quenching area (II), and a discharging area (III) in sequence along the length direction of the rollers (201); The push feeding device (3) comprises a hydraulic cylinder (301), the output direction of the output shaft of the hydraulic cylinder (301) is toward the loading area (I), the shaft end of the hydraulic cylinder (301) is provided with an adjustable push assembly (303), the adjustable push assembly (303) comprises a mounting base plate (3031), an adjusting plate (3032), a cantilever frame (3033), and a push head, the mounting base plate (3031) is provided with an adjusting plate (3032), the adjusting plate (3032) is provided with a cantilever frame (3033), the cantilever frame (3033) is an L-shaped cantilever frame, comprising a vertical upright pole and a horizontal hanging pole, the vertical upright pole is fixedly arranged on the adjusting plate (3032), the horizontal hanging pole is suspended above two groups of roller shafts (201), the end of the horizontal hanging pole is provided with a sleeve (3034), and the push head is slidably arranged in the sleeve (3034); The loading area (I) is provided with a loading device, which comprises a loading frame (5), a sliding plate (6), and a feeding device (7). The loading frame (5) is arranged on one side of the roller (201) and fixedly arranged on the side of the base frame (1). The sliding plate (6) is arranged above the outer side roller (201). The feeding device (7) is arranged between the sliding plate (6) and the loading frame (5). The spacing between the loading frame (5) and the sliding plate (6) is adjustable. The material receiving device comprises a receiving device (8) and a material receiving box (9); the receiving device (8) is arranged at the rear end of the roller shaft (201); the receiving device (8) comprises a mounting bracket (801), a blanking plate (802), a receiving plate (803), and a receiving plate adjusting plate (804); the mounting bracket (801) is fixedly arranged on the base frame (1); the blanking plate (802) is tiltedly arranged on the mounting bracket (801); the material receiving box (9) is arranged at the bottom of the tilted end of the blanking plate 802; a vertically penetrating sliding groove (8021) is arranged on the blanking plate (802); a receiving plate adjusting plate (804) is vertically arranged downward along an inner wall of one side of the sliding groove (8021); the receiving plate (803) is arranged in the sliding groove (8021); and the receiving plate (803) is fixedly arranged on the receiving plate adjusting plate (804).

2. A surface quenching device for small diameter shaft parts according to claim 1, characterized in that: The pusher head comprises a slide bar (3035), a stud (3036), and a push rod (3037); a stud (3036) is arranged at the lower end of the slide bar (3035); the stud (3036) is arranged horizontally; a push rod (3037) is arranged at the end of the stud (3036); and the push rod (3037) is suspended above the center position of the two roller shafts (201).

3. A surface quenching device for small diameter shaft parts according to claim 2, characterized in that: A concave sliding groove (30311) is provided on the installation base plate (3031), and the adjustment plate (3032) is arranged in the concave sliding groove (30311).

4. The surface quenching device for small diameter shaft parts according to claim 1 is characterized in that: The loading rack (5) comprises a loading chute plate (503), wherein the loading chute plate (503) is an inclined chute plate, and its inclination direction is toward the sliding plate (6); a first leg (501) and a second leg (502) are arranged below the loading chute plate (503); the bottom of the first leg (501) is arranged on the horizontal ground, and the bottom of the second leg (502) is arranged on the base frame (1); and the installation position of the second leg (502) on the base frame (1) is adjustable.

5. The surface quenching device for small diameter shaft parts according to claim 1 is characterized in that: The lifting device (7) comprises a lifting cylinder (701), a mounting seat (702), a lifting plate (703), and an auxiliary plate (704); the lifting cylinder (701) is fixedly arranged on the mounting seat (702); the mounting seat (702) is fixedly arranged on the base frame (1); the output direction of the output shaft of the lifting cylinder (701) is arranged upward; a lifting plate (703) is arranged at the end of the output shaft; and the lifting plate (703) is arranged between the loading chute plate (503) and the sliding plate (6).

6. The surface quenching device for small diameter shaft parts according to claim 5, characterized in that: An inclined surface (7031) is provided on the top end surface of the top plate (703), and the inclined direction of the inclined surface (7031) is toward the sliding plate (6).

7. The surface quenching device for small diameter shaft parts according to claim 5, characterized in that: An auxiliary plate (704) may also be provided on the side wall of the top plate (703), and the auxiliary plate (704) and the top plate (703) are matched and arranged to accommodate shaft parts with different diameters.

8. The surface quenching device for small diameter shaft parts according to claim 4 is characterized in that: A protective cover (11) is provided on the roller (201) of the rotating device (2) located at the quenching zone (II), and the protective cover (11) is provided with two cavities: a first cavity (1101) and a second cavity (1102), wherein the first cavity (1101) is a heat treatment cavity, and the second cavity (1102) is a shaft parts discharge zone.

9. The surface quenching device for small diameter shaft parts according to claim 1, characterized in that: The blanking plate (802) is also provided with a plurality of water leakage holes (8022).

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