Surface quenching device for automobile shaft parts

By incorporating a flame-spraying device that moves laterally and a rotating shaft in a surface hardening apparatus for automotive shaft parts, combined with infrared heating and cooling devices, the problem of uneven heat distribution is solved, the hardening effect is improved, and the hardness and wear resistance are enhanced.

CN223921481UActive Publication Date: 2026-02-17NANJING OURUI MACHINERY FORGING CO LTD
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Patent Information

Application Number
CN202520234843.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-14
Publication Date
2026-02-17
Estimated Expiration
2035-02-14

AI Technical Summary

Technical Problem

Existing surface hardening devices for automotive shaft parts suffer from uneven heat distribution, leading to uneven hardness and affecting the hardening effect.

Method used

A surface hardening device for automotive shaft parts is designed. By setting a flame-spraying device to move laterally and combining it with the rotation of the shaft parts, uniform heating is achieved. An infrared heater is used for preheating, and a cooling device is used for cooling to ensure the hardening effect.

Benefits of technology

This achieves uniform heating of the shaft surface, improves the quenching effect, enhances hardness and wear resistance, and extends service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of automobile shaft part machining, in particular to an automobile shaft part surface quenching device which can drive a flaming device to transversely move and a shaft part to rotate by arranging the equipment, so that the shaft part can be uniformly heated, and the quenching effect of the shaft part is improved. Comprising a quenching box, a material door, a handle, a socket, two groups of fixing plates, a bolt, a spring, a pull handle, four groups of supporting plates, two groups of first screw rods, two groups of moving blocks, two groups of chain wheels, a chain, a first motor, two groups of rotating shafts, two groups of connecting plates, two groups of electric push rods, two groups of circular clamping plates, a second motor, two groups of guide rods, a second screw rod, an adjusting block, a flaming device, a rotating device and a cooling device, the upper side of the front end of the quenching box communicates with a material opening, the two chain wheels are installed at the tops of the two first screw rods correspondingly and meshed with the chain, the flaming device is installed at the top end of the adjusting block, and the cooling device is installed at the top of the quenching box.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile axle class spare processing, especially to an automobile axle class spare surface quenching device. BACKGROUND

[0002] Automobile axle class spare is an important component of automobile transmission system and running system, mainly including drive axle, half axle, steering axle, transmission axle etc., the main function of these parts is to transmit power between engine and wheel, and ensure that the vehicle can travel smoothly and accurately steer.

[0003] The surface quenching of automobile axle class spare is a kind of heat treatment process, for improving the surface hardness and wear resistance of part, while keeping the toughness of core, surface quenching can enhance the ability of axle class spare to resist wear, fatigue and deformation, thereby prolonging its service life.

[0004] Automobile axle class spare surface quenching treatment usually uses flame quenching device, but its heat distribution is difficult to control, which may cause the problem of uneven hardness, thereby affecting its quenching effect. UTILITY MODEL CONTENTS

[0005] To solve the above technical problem, the utility model provides a kind of automobile axle class spare surface quenching device, by setting this equipment, can drive the transverse movement of fire spraying device and axle class spare rotation, so that axle class spare can be heated evenly, improve its quenching effect.

[0006] The utility model discloses an automobile axle surface quenching device, including quenching box, material door, handle, socket, two groups of fixed plate, bolt, spring, pull, four groups of support plate, two groups of first screw rod, two groups of moving block, two groups of chain wheel, chain, first motor, two groups of rotating shaft, two groups of connecting plate, two groups of electric push rod, two groups of round clamping plate, second motor, two groups of guide rod, second screw rod, adjusting block, fire -spouting device, rotating device and cooling device, and the upper side of the front end of quenching box is provided with the mouth of material, and the mouth of material of quenching box is rotatably installed, and the right side of the front end of material door is installed handle, and the right side of the front end of material door is installed socket, and the upper side of the front end of quenching box is installed two groups of fixed plate, and the perforation of socket and two groups of fixed plate is communicated, and the bolt slides in the perforation of two groups of fixed plate, and the bolt is matched with the perforation of socket and is packed, and the middle part of bolt is sleeved with spring, and the right side of the front end of bolt is installed pull, and the upper side and the lower side of left end and right end in quenching box are respectively installed four groups of support plate, and the left side two groups of support plate and the right side two groups of support plate are rotatably installed two groups of first screw rod, and the top two groups of support plate are respectively passed through the top two groups of support plate and extend to its upper side, and the top of two groups of first screw rod is installed two groups of chain wheel, and two groups of chain wheel are engaged with chain, and the left side top end in quenching box is installed first motor, and the output of first motor is connected with the top end of left side first screw rod, and the middle part of two groups of moving block is communicated with screw hole, and two groups of moving block are connected with two groups of first screw rod, and the inner end in two groups of moving block is rotatably installed two groups of rotating shaft, and the inner end in two groups of rotating shaft is installed two groups of connecting plate, and the inner end in two groups of connecting plate is installed two groups of electric push rod, and the output end in two groups of electric push rod is installed two groups of round clamping plate, and the right end in left moving block is installed rotating device, and rotating device is connected with left rotating shaft, and the right end in quenching box is installed second motor, and the lower part in quenching box is symmetrically installed two groups of guide rod, and the lower part in quenching box is rotatably installed second screw rod, and second screw rod is located between two groups of guide rod, and the middle part of adjusting block is communicated with screw hole, and the front and rear of adjusting block are communicated with slide hole, and adjusting block is connected with second screw rod, and adjusting block is slidably connected with two groups of guide rod, and the right end in quenching box is connected with the right end of second screw rod, and the top end in adjusting block is installed fire -spouting device, and the top in quenching box is installed cooling device.

[0007] Preferably, the rotating device comprises a third motor and two gears, the third motor is installed at the right end of the left moving block, the two gears are installed at the output end of the third motor and the left rotating shaft respectively, and the two gears are engaged.

[0008] Preferably, it further comprises four infrared heaters, and the four infrared heaters are installed at the front upper side and the rear upper side of the left end and the right end in the quenching box respectively.

[0009] Preferably, the cooling device comprises a liquid storage tank, a pump, a distribution plate and a control valve, the liquid storage tank and the pump are installed at the top end of the quenching tank, the input end of the pump is communicated with the left end of the liquid storage tank, the distribution plate is installed at the top end inside the quenching tank, a plurality of groups of nozzles are arranged at the bottom end of the distribution plate, the output end of the pump is communicated with the distribution plate through the top end of the quenching tank, and the left lower side of the quenching tank is communicated with a liquid discharge pipe, and the control valve is installed on the liquid discharge pipe.

[0010] Preferably, the quenching tank further comprises a protective plate, and the protective plate is installed at the right lower side inside the quenching tank and located above the flame spraying device.

[0011] Preferably, the quenching tank is provided with an observation window at the lower side of the front end.

[0012] Preferably, the quenching tank is provided with a heat insulation layer outside.

[0013] Preferably, the quenching tank further comprises four groups of T-shaped blocks, the four groups of T-shaped blocks are respectively installed at the front side and the rear side of the outer ends of the two groups of moving blocks, and the left end and the right end inside the quenching tank are respectively provided with two groups of T-shaped grooves, and the four groups of T-shaped blocks are respectively in sliding connection with the four groups of T-shaped grooves of the quenching tank.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the handle is used to open the material door, the shaft type piece is placed between the two groups of circular clamping plates, then the two groups of electric push rods are opened, the two groups of electric push rods drive the two groups of circular clamping plates to clamp and fix the shaft type piece, then the handle is used to close the material door, the bolt is matched and clamped with the socket under the action of the spring, so that the material door is fixed, then the first motor is opened, the first motor drives the left first screw rod to rotate, the left first screw rod drives the right first screw rod to rotate through the two groups of chain wheels and chains, the two groups of first screw rods are in threaded connection with the two groups of moving blocks, the two groups of moving blocks drive the shaft type piece to move downward to a specified height, then the flame spraying device and the second motor are opened, the second motor drives the second screw rod to rotate, the second screw rod is in threaded connection with the adjusting block, the adjusting block slides on the two groups of guide rods, the adjusting block drives the flame spraying device to move transversely, at the same time, the rotating device is opened, the rotating device drives the left rotating shaft to rotate, the left rotating shaft drives the shaft type piece to rotate through the left connecting plate, the moving flame spraying device performs omnibearing heating and quenching on the rotating shaft type piece, after the shaft type piece is quenched, the cooling device is opened, the cooling device sprays quenching liquid to cool the rotating shaft type piece, so that surface hardening is realized, through the arrangement of the equipment, the flame spraying device can move transversely and the shaft type piece can rotate, so that the shaft type piece can be heated uniformly, and the quenching effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the utility model;

[0016] Figure 2 is Figure 1 a sectional structure schematic view;

[0017] Figure 3 is Figure 1 the enlarged structural schematic view of A in the middle;

[0018] Figure 4 is Figure 2 the enlarged structural schematic view of B in the middle;

[0019] Figure 5 is Figure 2 the enlarged structural schematic view of C in the middle;

[0020] In the drawings: 1, quenching tank; 2, material door; 3, handle; 4, socket; 5, fixed plate; 6, bolt; 7, spring; 8, pull handle; 9, support plate; 10, first screw rod; 11, moving block; 12, chain wheel; 13, chain; 14, first motor; 15, rotating shaft; 16, connecting plate; 17, electric push rod; 18, circular clamping plate; 19, second motor; 20, guide rod; 21, second screw rod; 22, adjusting block; 23, fire spraying device; 24, infrared heater; 25, third motor; 26, gear; 27, liquid storage tank; 28, pump; 29, liquid distribution plate; 30, spray head; 31, liquid discharge pipe; 32, control valve; 33, protective plate; 34, observation window; 35, T-shaped block. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0022] As Figures 1 to 5As shown, the utility model of a kind of automobile axle surface quenching device, including quenching box 1, material door 2, handle 3, socket 4, two groups of fixed plate 5, bolt 6, spring 7, pull 8, four groups of support plate 9, two groups of first screw rod 10, two groups of moving block 11, two groups of chain wheel 12, chain 13, first motor 14, two groups of rotating shaft 15, two groups of connecting plate 16, two groups of electric push rod 17, two groups of circular clamping plate 18, second motor 19, two groups of guide rod 20, second screw rod 21, adjusting block 22, fire spraying device 23, rotating device and cooling device, quenching box 1 front end upside is provided with the mouth of material, material door 2 is rotatably installed at the mouth of material of quenching box 1, handle 3 is installed at the right side of front end of material door 2, socket 4 is installed at the right side of front end of material door 2, two groups of fixed plate 5 are installed at the upper side of front end of quenching box 1, and the perforation is uniformly provided in socket 4 and two groups of fixed plate 5, bolt 6 slides in the perforation of two groups of fixed plate 5, bolt 6 is matched with the perforation of socket 4 and is clamped, spring 7 is sleeved in the middle part of bolt 6, pull 8 is installed at the right side of front end of bolt 6, four groups of support plate 9 are respectively symmetrically installed on the upper side and the lower side of left end and right end in quenching box 1, two groups of first screw rod 10 are rotatably installed on left two groups of support plate 9 and right two groups of support plate 9 respectively, the top of two groups of first screw rod 10 respectively passes through the upper two groups of support plate 9 and extends to its upper side, two groups of chain wheel 12 are respectively installed at the top of two groups of first screw rod 10, and two groups of chain wheel 12 are engaged with chain 13, first motor 14 is installed at the top left side in quenching box 1, and the output end of first motor 14 is connected with the top end of left first screw rod 10, the middle part of two groups of moving block 11 is uniformly provided with threaded hole, and two groups of moving block 11 are respectively connected with two groups of first screw rod 10 by screwing, two groups of rotating shaft 15 are rotatably installed in the inner end of two groups of moving block 11, two groups of connecting plate 16 are respectively installed in the inner end of two groups of rotating shaft 15, two groups of electric push rod 17 are respectively installed in the inner end of two groups of connecting plate 16, two groups of circular clamping plate 18 are respectively installed in the output end of two groups of electric push rod 17, rotating device is installed at the right end of left moving block 11, and rotating device is connected with left rotating shaft 15, second motor 19 is installed at the lower side of right end of quenching box 1, two groups of guide rod 20 are symmetrically installed in the lower part in quenching box 1, second screw rod 21 is rotatably installed in the lower part in quenching box 1, and second screw rod 21 is located between two groups of guide rod 20, the middle part of adjusting block 22 is uniformly provided with threaded hole, the front and rear of adjusting block 22 are uniformly provided with sliding hole, adjusting block 22 is connected with second screw rod 21 by screwing, adjusting block 22 is connected with two groups of guide rod 20 by sliding, the output end of second motor 19 passes through the right end of quenching box 1 and is connected with the right end of second screw rod 21, fire spraying device 23 is installed at the top end of adjusting block 22, and cooling device is installed at the top of quenching box 1;

[0023] The door 2 is closed by the handle 3, the shaft is placed between the two sets of circular clamps 18, then the two sets of electric push rods 17 are opened, the two sets of circular clamps 18 are driven to clamp and fix the shaft, then the door 2 is closed by the handle 3, the pin 6 is matched and clamped with the socket 4 under the action of the spring 7, so as to fix the door 2, then the first motor 14 is opened, the first motor 14 drives the left first screw rod 10 to rotate, the left first screw rod 10 drives the right first screw rod 10 to rotate through the two sets of chain wheels 12 and chains 13, the two sets of first screw rods 10 are in threaded connection with the two sets of moving blocks 11, the two sets of moving blocks 11 drive the shaft to move downward to a specified height, then the flame spraying device 23 and the second motor 19 are opened, the second motor 19 drives the second screw rod 21 to rotate, the second screw rod 21 is in threaded connection with the adjusting block 22, the adjusting block 22 slides on the two sets of guide rods 20, the adjusting block 22 drives the flame spraying device 23 to move transversely, at the same time, the rotating device is opened, the rotating device drives the left rotating shaft 15 to rotate, the left rotating shaft 15 drives the shaft to rotate through the left connecting plate 16, the moving flame spraying device 23 sprays the rotating shaft in all directions, after the shaft is quenched, the cooling device is opened, the cooling device sprays the quenched liquid to cool the rotating shaft, so as to realize surface hardening, through the device, the flame spraying device 23 can move transversely and the shaft can rotate, so that the shaft can be heated uniformly, and the quenching effect is improved.

[0024] As a preferred embodiment of the above, the rotating device comprises a third motor 25 and two sets of gears 26, the third motor 25 is installed at the lower side of the right end of the left moving block 11, the two sets of gears 26 are installed at the output end of the left rotating shaft 15 and the third motor 25 respectively, and the two sets of gears 26 are engaged with each other.

[0025] Through the third motor 25 and the gears 26, the third motor 25 drives the left rotating shaft 15 to rotate through the engagement of the two sets of gears 26, so that the shaft can rotate to be quenched and cooled more fully.

[0026] As a preferred embodiment of the above, it further comprises four sets of infrared heaters 24, which are installed at the front upper side and the rear upper side of the left end and the right end in the quenching box 1.

[0027] Through the infrared heaters 24, the shaft can be preheated, so as to reduce the temperature gradient, reduce the risk of deformation, and prepare for the subsequent flame quenching.

[0028] As the preferred of the above embodiment, the cooling device comprises a liquid storage tank 27, a pump 28, a distribution plate 29 and a control valve 32, the liquid storage tank 27 and the pump 28 are both installed at the top end of the quenching tank 1, the input end of the pump 28 is communicated with the left end of the liquid storage tank 27, the distribution plate 29 is installed at the top end inside the quenching tank 1, a plurality of groups of nozzles 30 are arranged at the bottom end of the distribution plate 29, the output end of the pump 28 is communicated with the distribution plate 29 through the top end of the quenching tank 1, a liquid discharge pipe 31 is arranged at the lower left end of the quenching tank 1, and the control valve 32 is installed on the liquid discharge pipe 31;

[0029] By arranging the liquid storage tank 27, the pump 28, the distribution plate 29, the nozzles 30, the liquid discharge pipe 31 and the control valve 32, when the pump 28 is opened, the quenching liquid in the liquid storage tank 27 is introduced into the distribution plate 29 by the pump 28 and sprayed out by the plurality of groups of nozzles 30 to cool the rotating shaft member, and the quenching liquid after cooling the shaft member can be discharged through the liquid discharge pipe 31 by opening the control valve 32, so that the shaft member after quenching can be cooled and hardened in time.

[0030] As the preferred of the above embodiment, it further comprises a protective plate 33, which is installed at the lower right end inside the quenching tank 1 and located above the flame spraying device 23.

[0031] By arranging the protective plate 33, when the shaft member needs to be cooled, the flame spraying device 23 is moved below the protective plate 33, so that the cooling liquid can be prevented from splashing on the flame spraying device 23, thereby protecting the flame spraying device 23.

[0032] As the preferred of the above embodiment, the lower left end of the quenching tank 1 is provided with an observation window 34.

[0033] By arranging the observation window 34, the quenching process of the shaft member can be observed.

[0034] As the preferred of the above embodiment, the outer side of the quenching tank 1 is provided with a heat insulation layer.

[0035] The temperature in the quenching tank 1 can be prevented from leaking out, and the staff can be prevented from being scalded when touching the quenching tank 1.

[0036] As the preferred of the above embodiment, it further comprises four groups of T-shaped blocks 35, which are respectively installed at the front side and the rear side of the outer ends of the two groups of moving blocks 11, and two groups of T-shaped grooves are arranged at the left end and the right end inside the quenching tank 1, and the four groups of T-shaped blocks 35 are respectively connected with the four groups of T-shaped grooves of the quenching tank 1 in a sliding manner.

[0037] By arranging the T-shaped blocks 35, the stability of the lifting of the moving blocks 11 can be improved.

[0038] The utility model discloses a kind of automobile axle parts surface quenching devices, when working, first by handle 3 open material door 2, place axle parts between two groups of circular clamps 18, then open two groups of electric push rod 17, two groups of electric push rod 17 then drive two groups of circular clamps 18 to axle parts are clamped and fixed, four groups of infrared heater 24 are then opened, four groups of infrared heater 24 then preheat to axle parts, then by handle 3 close material door 2, bolt 6 is then cooperated with socket 4 with the cooperation of spring 7 Pack, to fix material door 2, then open first motor 14, first motor 14 then drive left side first screw rod 10 rotation, left side first screw rod 10 then drive right side first screw rod 10 rotation by two groups of sprocket 12 and chain 13, two groups of first screw rod 10 are then with two groups of moving block 11 screw connection, two groups of moving block 11 then drive axle parts to move downward to specified height, open jet device 23 and second motor 19, second motor 19 then drive second screw rod 21 rotation, second screw rod 21 then with adjusting block 22 screw connection, adjusting block 22 then slide on two groups of guide rod 20, adjusting block 22 then drive jet device 23 transverse movement, while opening rotating device, rotating device then drive left side rotating shaft 15 rotation, left side rotating shaft 15 then drive axle parts rotation by left side connecting plate 16, moving jet device 23 then carries out all-round heating quenching to rotating axle parts, after axle parts quenching is completed, open pump 28, quenching liquid in storage tank 27 then by pump 28 is introduced into into the distribution plate 29 by multiple groups of nozzle 30 and is sprayed to rotating axle parts and is cooled, quenching liquid after axle parts cooling can be discharged by opening control valve 32 by liquid discharge pipe 31 It can be discharged.

[0039] The utility model discloses a kind of automobile axle parts surface quenching devices, its installation mode, connection mode or setting mode are common mechanical mode, as long as it can achieve its beneficial effect can be implemented;The first motor 14 of the utility model discloses a kind of automobile axle parts surface quenching device, electric push rod 17, second motor 19, jet device 23, infrared heater 24, third motor 25 and pump 28 are purchased on market, and in this industry, technical personnel only need to install and operate according to its accompanying instruction book.

[0040] The above-mentioned is only preferred implementation mode of the utility model, it should be pointed out, for ordinary technical personnel in this technical field, without departing from the technical principle of the utility model, still can make several improvements and variations, these improvements and variations also should be regarded as the protection range of the utility model.

Claims

1. A surface hardening device for automotive shaft parts, characterized in that, The utility model provides a quenching box, material door, handle, socket, two groups of fixed plate, bolt, spring, pull handle, four groups of support plate, two groups of first screw rod, two groups of moving block, two groups of chain wheel, chain, first motor, two groups of rotating shaft, two groups of connecting plate, two groups of electric push rod, two groups of circular clamping plate, second motor, two groups of guide rod, second screw rod, adjusting block, fire spraying device, rotating device and cooling device, the upper side of the front end of quenching box (1) is provided with the mouth of material, and the material door (2) is rotatably installed at the mouth of material of quenching box (1), the handle (3) is installed at the right side of the front end of material door (2), the socket (4) is installed at the right side of the front end of material door (2), two groups of fixed plate (5) are installed at the upper side of the front end of quenching box (1), and the perforation is formed in the socket (4) and two groups of fixed plate (5), the bolt (6) slides in the perforation of two groups of fixed plate (5), the bolt (6) is matched with the perforation of socket (4) and is clamped, the spring (7) is sleeved in the middle part of bolt (6), the pull handle (8) is installed at the right side of the front end of bolt (6), four groups of support plate (9) are respectively installed on the upper side and the lower side of the left end and the right end in quenching box (1), two groups of first screw rod (10) are rotatably installed on the left two groups of support plate (9) and the right two groups of support plate (9) respectively, and the top of two groups of first screw rod (10) respectively passes through the upper two groups of support plate (9) and stretches to the upper side thereof, two groups of chain wheel (12) are installed on the top of two groups of first screw rod (10) respectively, two groups of chain wheel (12) are all engaged with chain (13), first motor (14) is installed at the top left side in quenching box (1), and the output end of first motor (14) is connected with the top end of left first screw rod (10), the middle part of two groups of moving block (11) is provided with threaded hole, two groups of moving block (11) are respectively connected with two groups of first screw rod (10) in a threaded mode, two groups of rotating shaft (15) are rotatably installed in the inner end of two groups of moving block (11), two groups of connecting plate (16) are respectively installed in the inner end of two groups of rotating shaft (15), two groups of electric push rod (17) are respectively installed in the inner end of two groups of connecting plate (16), two groups of circular clamping plate (18) are respectively installed in the output end of two groups of electric push rod (17), the rotating device is installed at the right end of left moving block (11), and the rotating device is connected with left rotating shaft (15) in a matched mode, second motor (19) is installed at the lower side of the right end of quenching box (1), two groups of guide rod (20) are symmetrically installed in the lower part in quenching box (1), second screw rod (21) is rotatably installed in the lower part in quenching box (1), and second screw rod (21) is located between two groups of guide rod (20), the middle part of adjusting block (22) is provided with threaded hole, the front part and the rear part of adjusting block (22) are provided with sliding hole, adjusting block (22) is connected with second screw rod (21) in a threaded mode, adjusting block (22) is connected with two groups of guide rod (20) in a sliding mode, and the output end of second motor (19) passes through the right end of quenching box (1) and is connected with the right end of second screw rod (21).The fire spraying device (23) is installed on the top of the adjusting block (22), and the cooling device is installed on the top of the quenching box (1).

2. A device for quenching the surface of an automotive axle member as set forth in claim 1, wherein The rotating device comprises a third motor (25) and two sets of gears (26), the third motor (25) is installed at the lower side of the right end of the left moving block (11), the two sets of gears (26) are installed at the left rotating shaft (15) and the output end of the third motor (25) respectively, and the two sets of gears (26) are engaged.

3. A device for surface quenching of an automotive axle member as set forth in claim 2 wherein, The device further comprises four sets of infrared heaters (24), which are installed at the front upper side and the rear upper side of the left end and the right end in the quenching box (1) respectively.

4. A device for surface quenching of an automotive axle member as set forth in claim 3, wherein The cooling device comprises a liquid storage tank (27), a pump (28), a distribution plate (29) and a control valve (32), the liquid storage tank (27) and the pump (28) are both installed at the top end of the quenching box (1), the input end of the pump (28) is communicated with the left end of the liquid storage tank (27), the distribution plate (29) is installed at the top end in the quenching box (1), a plurality of groups of nozzles (30) are arranged at the bottom end of the distribution plate (29), the output end of the pump (28) is communicated with the distribution plate (29) through the top end of the quenching box (1), a liquid discharge pipe (31) is arranged at the lower side of the left end of the quenching box (1), and the control valve (32) is installed on the liquid discharge pipe (31).

5. A device for quenching the surface of an automotive axle member as set forth in claim 4 wherein, The device further comprises a protective plate (33), which is installed at the lower side of the right end in the quenching box (1) and located above the flame spraying device (23).

6. A device for surface quenching of an automotive axle member as set forth in claim 5, wherein The lower side of the front end of the quenching box (1) is provided with an observation window (34).

7. A device for surface quenching of an automotive axle member as defined in claim 6, wherein The outer side of the quenching box (1) is provided with a heat insulation layer.

8. A device for quenching the surface of an automotive axle member as set forth in claim 7 wherein, The device further comprises four sets of T-shaped blocks (35), which are installed at the front side and the rear side of the outer ends of the two moving blocks (11), and the left end and the right end in the quenching box (1) are both provided with two sets of T-shaped grooves, and the four sets of T-shaped blocks (35) are slidably connected with the four sets of T-shaped grooves of the quenching box (1) respectively.