CN208964989U - A kind of unidirectional loads gear quenching equipment - Google Patents
A kind of unidirectional loads gear quenching equipment Download PDFInfo
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- CN208964989U CN208964989U CN201821316216.9U CN201821316216U CN208964989U CN 208964989 U CN208964989 U CN 208964989U CN 201821316216 U CN201821316216 U CN 201821316216U CN 208964989 U CN208964989 U CN 208964989U
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- gear
- quenching
- induction heater
- driving
- unidirectional loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model discloses a kind of unidirectional loads gear quenching equipment, including installing the mounting base of gear and ejecting mechanism of the mounting base for gear ejection and the quenching mechanism for the quenching of gear unidirectional loads face being arranged in, the quenching mechanism includes the controller and quenching unit connected to the controller and cooling device for connecting power supply；The quenching unit includes induction heater and driving induction heater and the liftout attachment that gear tooth load surface connects or separates, and the liftout attachment includes the sliding block for connecting induction heater and the driving mechanism of driving sliding block movement；The ejecting mechanism includes the mandril of connection gear, and the mandril is connect with driving device.The utility model is novel in design, easy for installation, easy to operate, easy to maintenance, can be used in the more complicated gear tooth load surface of heating quenching, and has many advantages, such as that processing cost is low and high production efficiency.
Description
Technical field
The utility model relates to gear quenching field more particularly to a kind of unidirectional loads gear quenching equipment.
Background technique
It is well known that gear is components crucial in mechanical equipment, it is widely used in automobile, aircraft, tank, wheel
The industrial circles such as ship.It has many advantages, such as accurate, the compact-sized long service life of transmission.Gear drive be in modern age machine most
A kind of common mechanical oscillation are a kind of important forms for transmitting machine power and movement, are engineering goods important foundation parts.
It has power bracket big compared with band, chain, friction, hydraulic etc. are mechanical, and transmission efficiency is high, peripheral speed is high, transmission ratio is quasi-
Really, the series of advantages such as long service life, dimensional structure be small.Therefore it has become the indispensable transmission of many engineering goods
The maximum driving form of proportion in component and machine.Due to prominent position of the gear in industrial development, make gear
It is acknowledged as the pulling that a kind of industrialized symbol has benefited from automobile, wind-powered electricity generation, nuclear power industry in recent years, automobile gear processing machine
Bed, the demand growth of Big sized gear machining tool are very dazzling.It is reported that with the increase of gear cutting machine demand, closely
The enterprise for being related to gear cutting machine manufacture over year is also increasing.Either traditional automobile, ship, aerospace, military project
Etc. industries, still the industries such as high-speed rail emerging in recent years, railway, electronics, all propose the fast development of Machine Tool Industry
Pressing needs, to gear cutting machine, manufacturer is put forward new requirements.
In rotation, actual gear load is different usual gear, and often based on one-way abrasion, gear rises wear-resisting
Effect is its depth for quenching layer, quenches thickness, and then gear is wear-resisting, still, quenches the too thick easy embrittlement of layer.Many institute's weeks
Know, the quenching layer depth of gear is excessively shallowly all unfavorable to contacting and being bent bearing capacity.But quenching layer is also not more deeper better, it is best or
Case depth appropriate can make the flank of tooth and tooth root intensity (bearing capacity) all with higher.
The gear teeth of gear are weighted load face on one side, and another side seldom loads in the case where reversion, in addition, gear is one
Seldom reversed installation after the installation of a direction, belongs to underloading face, and existing processing method is either weighted load face or underloading
Face is heated all together, is quenched together, although meeting the technique requirement of quenching, is reduction of the quality of gear, the gear teeth by
Power load surface is easier to be worn or be broken in subsequent processing operation, and service life shortens.
Patent No. CN201210243890.X discloses a kind of process of pivoting support gear quenching, this is practical new
Type by between intermediate frequency inductor and roller seating space coupling gap, the depth of current penetration, roller seating space linear velocity, the temperature of quenching liquid and
The setting and adjustment of the technological parameters such as concentration, improve quenching quality, but the utility model tooth all to gear is quenched
Fire processing, affects the service life of gear to a certain extent.
The quenching unit of the utility model is mainly quenched in the load surface of gear tooth, and quenched load surface is made
Hardened layer is formed on the gear teeth and forms high hard surface layer on the surface of hardened layer, and the thickness setting of high hard surface layer exists
0.05mm to 0.2mm, and the 1/5 to 1/3 of gear teeth thickness is arranged in the thickness of hardened layer, as shown in attached drawing 9, Figure 10.
Utility model content
The purpose of the utility model is to overcome problem above of the existing technology, a kind of unidirectional loads gear is provided and is quenched
Fiery equipment, the utility model is novel in design, easy for installation, easy to operate, easy to maintenance, and it is complex to can be used in heating quenching
Tooth load face, and have many advantages, such as that processing cost is low and high production efficiency.
To realize above-mentioned technical purpose and the technique effect, the utility model is achieved through the following technical solutions:
A kind of unidirectional loads gear quenching equipment is used for gear in mounting base including installing the mounting base of gear and being arranged
The ejecting mechanism of ejection and the quenching mechanism quenched for gear unidirectional loads face, the quenching mechanism include the control for connecting power supply
Device processed and quenching unit connected to the controller and cooling device；The quenching unit includes induction heater and driving sense
The liftout attachment for answering heater and gear tooth load surface to connect or separate, the liftout attachment include connection induction heater
Sliding block and the driving mechanism of driving sliding block movement；The ejecting mechanism includes the mandril of connection gear, the mandril and driving
Device connection.
Preferably, the induction heater is provided with several, each induction heater and gear one wheel
The load surface of tooth connects；The distance between the tooth load face and induction heater are arranged in 0.05mm to 0.15mm；It is described
Tooth load face is set to the side of gear clockwise or counterclockwise；The induction heater is set as inductance coil.Using this
Technical solution had both had how many induction heater multiple gear teeth are just arranged on gear.
Preferably, the driving mechanism includes the drive that the top plate being arranged in mounting base and driving top plate move up and down
Dynamic device and several jacking blocks being arranged on top plate, several jacking blocks are connect several with several induction heaters
A sliding block connection.It adopts this technical solution, top plate is pushed by driving device, the jacking block for connecting top plate moves up, to push
Sliding block moves forward the induction heater on sliding block；Top plate is pulled by driving device, the jacking block for connecting top plate is to moving down
It is dynamic, to pull sliding block, move backward the induction heater on sliding block.
Preferably, the side of the sliding block connection jacking block is provided with oblique chute, it is arranged in the oblique chute and jacking block
Oblique guide block connection.It adopts this technical solution, sliding block is pushed or pull on by jacking block, moves forward or back sliding block.
Preferably, the driving device includes the hydraulic control system of hydraulic telescopic rod and driving hydraulic telescopic rod,
The hydraulic control system is connect with controller.It adopts this technical solution, hydraulic telescopic rod is driven by hydraulic control system, makes liquid
The piston rod of telescopic rod is pressed to stretch out or retract.
Preferably, being provided with gear quenching mounting groove in the mounting base, the middle section of the mounting groove is provided with
Support the supporting table of gear, the jogger hole for being provided centrally with connection mandril of the supporting table, positioned at the surrounding of the supporting table
It is provided with the liquid-leaking nozzle of multiple leakages.It adopts this technical solution, supporting table cannot be only used for support gear, and can allow gear
The bottom of the gear teeth is hanging, to help to quench；Liquid-leaking nozzle is for draining to the quenching liquid of cooling gear in containing liquid chamber.
Preferably, the cooling device includes the containing liquid chamber being arranged under mounting base and is arranged in containing liquid chamber and control
The electrodynamic pump of device processed connection, the quenching liquid connection in one end and containing liquid chamber of the electrodynamic pump, the other end are set with mounting groove surrounding
The nozzle connection set.It adopts this technical solution, is pumped the quenching liquid in containing liquid chamber to nozzle by water pipe by electrodynamic pump, by spraying
Gear of the mouth into mounting groove carries out sprinkling cooling.
Preferably, the two sides of the bottom of the mounting base are provided with supporting block, space use is provided between the supporting block
In placement containing liquid chamber.It adopts this technical solution, supporting block is used to support mounting base, convenient for parts such as storage containing liquid chambers.
Preferably, the controller includes the control circuit board for connecting power supply, hydraulic control system and induction heater
And the human-machine operation panel being connect with control circuit board.It adopts this technical solution, the control that can be arranged by human-machine operation panel
Program or starting or the pass for manually controlling hydraulic control system, induction heater and electrodynamic pump by ergonomic surfaces plate by worker
It closes.
Preferably, being provided with positioning column on the mandril and the locating piece of positioning column side being arranged in；The positioning
The connection of the axis hole of column and gear, the locating piece are connect with the locating slot on gear.It adopts this technical solution, locating piece is for fixed
The installation site of position gear, enables the gear teeth on gear to connect with induction heater.
Preferably, the supporting table is additionally provided with the magnet of connection gear, the magnet is located at the surrounding of mandril.Using
This technical solution, magnet can be used in for gear being adsorbed in supporting table.
The beneficial effects of the utility model are:
1. the utility model is novel in design, easy for installation, easy to operate, easy to maintenance, it can be used in heating quenching more
Complicated gear tooth load surface, and have many advantages, such as that processing cost is low and high production efficiency；
2. the induction heater of the utility model can simultaneously heating quenching gear tooth load surface；It heats fast, high-efficient；
3. the quenched strength of gear teeth of the utility model is high, load capacity is strong, wearability is good, long service life；By
High hard surface layer and stiffening layer is arranged in the load of the gear teeth on one side, so that the surface of the gear teeth is not easy to wear, is able to bear biggish change
Shape amount, and the high hard surface layer being arranged is not susceptible to embrittlement.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail
It describes in detail bright.Specific embodiment of the present utility model is shown in detail by following embodiment and its attached drawing.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings:
Fig. 1 be the utility model relates to quenching unit top view；
Fig. 2 be the utility model relates to partial profile structure；
Fig. 3 be the utility model relates to the enlarged diagram that is connect with sliding block of jacking block；
Fig. 4 be the utility model relates to top board structure schematic diagram；
Fig. 5 be the utility model relates to mandril and gear connection schematic diagram；
Fig. 6 be the utility model relates to gear scheme of installation；
Fig. 7 be the utility model relates to gear install top view；
Fig. 8 be the utility model relates to the schematic diagram that is connect with gear tooth of induction heater；
Fig. 9 be the utility model relates to gear structure schematic diagram；
Figure 10 be the utility model relates to gear tooth structure enlargement diagram.
Figure label explanation: mounting base 1, controller 2, induction heater 3, sliding block 4, oblique chute 401, mandril 5, positioning column
501, locating piece 502, top plate 6, jacking block mounting groove 601, piston rod mounting groove 602, positioning guide hole 603, jacking block 7, oblique guide block
701, hydraulic telescopic rod 8, piston rod 801, mounting groove 9, supporting table 10, liquid-leaking nozzle 11, containing liquid chamber 12, electrodynamic pump 13, quenching liquid
14, nozzle 15, supporting block 16, gear 17, the gear teeth 171, load surface 172, hardened layer 1721, high hard surface layer 1722, axis hole
173, locating slot 174, magnet 18, water pipe 19.
Specific embodiment
The utility model will be further described with reference to the accompanying drawing:
Referring to figs. 1 to shown in Figure 10, a kind of unidirectional loads gear quenching equipment, including install the mounting base 1 of gear 17 with
And ejecting mechanism of the mounting base 1 for the ejection of gear 17 and the quenching press for the quenching of 17 unidirectional loads face 172 of gear are set
Structure, the quenching mechanism include the quenching unit and cooling device for connecting the controller 2 of power supply and connecting with controller 2；Institute
Stating quenching unit includes that induction heater 3 and driving induction heater 3 connect or divide with 17 gear teeth of gear, 171 load surface 172
From liftout attachment, the liftout attachment includes the sliding block 4 and the mobile driving machine of driving sliding block 4 for connecting induction heater 3
Structure；The ejecting mechanism includes the mandril 5 of connection gear, and the mandril 5 is connect with driving device.
Preferably, the induction heater 3 is provided with several, each induction heater 3 and gear 17 1
The load surface 172 of a gear teeth 171 connects；The setting of the distance between 171 load surface 172 of the gear teeth and induction heater 3 exists
0.05mm to 0.15mm；171 load surface 172 of the gear teeth is set to the side of gear 17 clockwise or counterclockwise；The induction
Heater 3 is set as inductance coil.It adopts this technical solution, has both there is how many sense multiple gear teeth 171 are just arranged on gear 17
Answer heater 3.
Preferably, the driving mechanism includes that the top plate 6 being arranged in mounting base 1 and driving top plate 6 move up and down
Driving device and setting several jacking blocks 7 on the top plate 6, several jacking blocks 7 and several induction heaters 3 connect
Several sliding blocks 4 connection connect.It adopts this technical solution, top plate 6 is pushed by driving device, the jacking block 7 for connecting top plate 6 is upward
It is mobile, to push sliding block 4, move forward the induction heater 3 on sliding block 4；Top plate 6 is pulled by driving device, connects top plate 6
The jacking block 7 connect moves down, and to pull sliding block 4, moves backward the induction heater 3 on sliding block 4.
Preferably, the side that the sliding block 4 connects jacking block 7 is provided with oblique chute 401, the oblique chute 401 and jacking block 7
The oblique guide block 701 of upper setting connects.Adopt this technical solution, sliding block 4 pushed or pull on by jacking block 7, make sliding block 4 advance or after
It moves back.
Preferably, the driving device includes hydraulic telescopic rod 8 and the hydraulic control system for driving hydraulic telescopic rod 8
System, the hydraulic control system are connect with controller 2.It adopts this technical solution, hydraulic telescopic rod is driven by hydraulic control system
8, so that the piston rod of hydraulic telescopic rod 8 is stretched out or is retracted.
Preferably, being provided with gear 17 in the mounting base 1 quenches mounting groove 9, the middle part of the mounting groove 9 sets up separately
It is equipped with the supporting table 10 of support gear 17, the jogger hole for being provided centrally with connection mandril 5 of the supporting table 10 is located at the branch
The surrounding of support platform 9 is provided with the liquid-leaking nozzle 11 of multiple leakages.It adopts this technical solution, supporting table 10 cannot be only used for support gear
17, and the bottom of 17 gear teeth 171 of gear can be allowed hanging, to help to quench；Liquid-leaking nozzle 11 is used for cooling gear 17
Quenching liquid 14 drain in containing liquid chamber 12.
Preferably, the cooling device includes the containing liquid chamber 12 being arranged under mounting base 1 and is arranged in containing liquid chamber
One end of 12 electrodynamic pumps 13 connecting with controller 2, the electrodynamic pump 13 is connect with the quenching liquid 14 in containing liquid chamber 12, the other end
It is connect with the nozzle 15 of 9 surrounding of mounting groove setting.It adopts this technical solution, it will be in containing liquid chamber 12 by water pipe 19 by electrodynamic pump 13
Quenching liquid 14 pump to nozzle 15, sprinkling cooling is carried out from gear 17 of the nozzle 15 into mounting groove 9.
Preferably, the two sides of the bottom of the mounting base 1 are provided with supporting block 16, setting is free between the supporting block 16
Between for placing containing liquid chamber 12.It adopts this technical solution, supporting block 16 is used to support mounting base 1, convenient for storage containing liquid chamber 12 etc.
Part.
Preferably, the controller 2 includes the control circuit of connection power supply, hydraulic control system and induction heater 3
Plate and the human-machine operation panel being connect with control circuit board.It adopts this technical solution, the control that can be arranged by human-machine operation panel
Processing procedure sequence manually controls opening for hydraulic control system, induction heater 3 and electrodynamic pump 13 by ergonomic surfaces plate by worker
Dynamic or closing.
Preferably, being provided with positioning column 501 on the mandril 5 and the locating piece of 501 side of positioning column being arranged in
502；The positioning column 501 is connect with the axis hole 173 of gear 17, and the locating piece 502 connects with the locating slot 174 on gear 17
It connects.Adopt this technical solution, locating piece 502 is used to position the installation site of gear 17, enable the gear teeth 171 on gear 17 with
Induction heater 3 connects.
Preferably, the supporting table 10 is additionally provided with the magnet 18 of connection gear 17, the magnet 18 is located at mandril 5
Surrounding.It adopts this technical solution, magnet 18 can be used in for gear 17 being adsorbed in supporting table 10.
Specific embodiment
In actual use, mandril 5 is ejected by gear mounting groove 9 by the piston rod 801 of hydraulic telescopic rod 8, it then, will
The gear 17 for needing to quench is placed on the positioning column 501 and locating piece 502 of mandril 5, positions gear 17, as shown in Figure 5；So
Afterwards, by hydraulic telescopic rod 8 piston rod 801 retraction drive connection mandril 5, make mandril 5 reset, mandril 5 reset make gear 17 with
Supporting table 10 in gear mounting groove 9 connects, and is adsorbed in supporting table 10 by the magnet 18 in supporting table 10, such as Fig. 6
It is shown；Then, top plate 6 is pushed by the hydraulic telescopic rod 8 in driving mechanism, the jacking block 7 for connecting top plate 6 moves up, to push away
Movable slider 4 moves forward the induction heater 3 on sliding block 4, the load surface with 17 gear teeth 171 of gear in gear mounting groove 9
172 connections, as shown in Fig. 6, Fig. 7, Fig. 8；At this point, being brought rapidly up by the energization of induction heater 3, make the negative of 17 gear teeth 171 of gear
172 heating quenching of section, when 17 gear teeth of gear, 171 load surface 172 is heated to critical-temperature, after held for some time, by
Electrodynamic pump 13 pumps the quenching liquid 14 in containing liquid chamber 12 to nozzle 15, and quenching liquid 14 is sprayed to the wheel of gear 17 by nozzle 15
On tooth 171, it is made to be quickly cooled down cooling, it is cooling to reach user's hardness to be quenched by repeated hardening, such as Fig. 9, Figure 10
It is shown；After the completion of the quenching of gear 17 is cooling, top plate 6 is pulled by the hydraulic telescopic rod 8 in driving mechanism, connects top plate 6
Jacking block 7 moves down, and to pull sliding block 4, moves backward the induction heater 3 on sliding block 4, with the tooth in gear mounting groove 9
The load surface 172 for taking turns 17 gear teeth 171 separates；At this point, quenched gear 17 is ejected gear by the mandril 5 in ejecting mechanism again
Mounting groove 9 takes out quenched gear 17 by user, reinstalls and the gear 17 quenched is needed to continue to quench.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described with power
Subject to the protection scope that benefit requires.
Claims (10)
1. a kind of unidirectional loads gear quenching equipment, including installing the mounting base (1) of gear (17) and being arranged in mounting base (1)
Ejecting mechanism for gear (17) ejection and the quenching mechanism for gear (17) unidirectional loads face (172) quenching, feature
Be: the quenching mechanism includes the quenching unit and cooling dress for connecting the controller (2) of power supply and connecting with controller (2)
It sets；The quenching unit includes that induction heater (3) and driving induction heater (3) and gear (17) gear teeth (171) load
The liftout attachment that face (172) connects or separates, the liftout attachment include the sliding block (4) of connection induction heater (3) and drive
The mobile driving mechanism of movable slider (4)；The ejecting mechanism includes the mandril (5) of connection gear, and the mandril (5) and driving fill
Set connection.
2. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: the induction heater
(3) several are provided with, the load surface (172) of each induction heater (3) and (17) gear teeth (171) of gear is even
It connects；The distance between the gear teeth (171) load surface (172) and induction heater (3) are arranged in 0.05mm to 0.15mm；It is described
The gear teeth (171) load surface (172) is set to the side of gear (17) clockwise or counterclockwise；Induction heater (3) setting
For inductance coil.
3. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: the driving mechanism includes
It is arranged in the top plate (6) in mounting base (1) and the driving device for driving top plate (6) to move up and down and is arranged on top plate (6)
Several jacking blocks (7), several sliding blocks (4) company that several jacking blocks (7) are connect with several induction heaters (3)
It connects.
4. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: sliding block (4) connection
The side of jacking block (7) is provided with oblique chute (401), and the oblique guide block (701) being arranged on the oblique chute (401) and jacking block (7) is even
It connects.
5. a kind of unidirectional loads gear quenching equipment according to claim 1 or 3, it is characterised in that: the driving device
Hydraulic control system including hydraulic telescopic rod (8) and driving hydraulic telescopic rod (8), the hydraulic control system and controller
(2) it connects.
6. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: on the mounting base (1)
It is provided with gear (17) quenching mounting groove (9), the middle section of the mounting groove (9) is provided with the supporting table of support gear (17)
(10), the jogger hole for being provided centrally with connection mandril (5) of the supporting table (10), the surrounding for being located at the supporting table (10) are set
It is equipped with the liquid-leaking nozzle (11) of multiple leakages.
7. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: the cooling device includes
The electrodynamic pump that the containing liquid chamber (12) and setting being arranged under mounting base (1) are connect in containing liquid chamber (12) with controller (2)
(13), the quenching liquid (14) in one end with containing liquid chamber (12) of the electrodynamic pump (13) is connect, the other end and mounting groove (9) surrounding
The nozzle (15) of setting connects.
8. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: the mounting base (1)
Two sides of the bottom are provided with supporting block (16), and space is provided between the supporting block (16) for placing containing liquid chamber (12).
9. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: controller (2) packet
It includes the control circuit board of connection power supply, hydraulic control system and induction heater (3) and is connect with control circuit board man-machine
Operation panel.
10. a kind of unidirectional loads gear quenching equipment according to claim 1, it is characterised in that: set on the mandril (5)
Positioning column (501) and setting are equipped in the locating piece (502) of positioning column (501) side；The positioning column (501) and gear
(17) axis hole (173) connection, the locating piece (502) connect with the locating slot (174) on gear (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821316216.9U CN208964989U (en) | 2018-08-15 | 2018-08-15 | A kind of unidirectional loads gear quenching equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821316216.9U CN208964989U (en) | 2018-08-15 | 2018-08-15 | A kind of unidirectional loads gear quenching equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208964989U true CN208964989U (en) | 2019-06-11 |
Family
ID=66753160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821316216.9U Active CN208964989U (en) | 2018-08-15 | 2018-08-15 | A kind of unidirectional loads gear quenching equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208964989U (en) |
-
2018
- 2018-08-15 CN CN201821316216.9U patent/CN208964989U/en active Active
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