CN106319170B - A kind of heat treatment pit-type furnace quenching tooling and its assembly method - Google Patents
A kind of heat treatment pit-type furnace quenching tooling and its assembly method Download PDFInfo
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- CN106319170B CN106319170B CN201610912645.1A CN201610912645A CN106319170B CN 106319170 B CN106319170 B CN 106319170B CN 201610912645 A CN201610912645 A CN 201610912645A CN 106319170 B CN106319170 B CN 106319170B
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- hanger
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- hanging ring
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/005—Furnaces in which the charge is moving up or down
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to a kind of heat treatment pit-type furnace quenching tooling and its assembly methods, tool mechanism includes flap seat, sunpender, hanger, hanger is disc-shaped, has the connecting hole being connect with sunpender in the middle part of hanger, several to hanging pawl circumferentially around the equiangularly spaced distribution in center, each pair of hang forms hanger between pawl, it is equipped in hanger and is interspersed in two and hangs lateral pin between pawl, hanging ring, hanging ring lower part fixing axle part are equipped in the middle part of lateral pin；The assembly method of the tooling includes making tooling, assembly tool, installation axle part, placing tooling, in installation axle part step, axis parts count to be mounted needed for artificial judgment so that axis part is hung around hanger central symmetry.Using the structure, more than one piece workpiece can be handled simultaneously, improves production efficiency, reduce production cost, and workpiece is vacantly hung, and the generation of Heat Treatment Distortion is reduced；Its assembly method can improve adaptability of the tooling to heat treatment, and improve the stability during tooling hanging workpiece.
Description
Technical field
The present invention relates to a kind of heat treatment pit-type furnace quenching tooling and its assembly methods, belong to heat treatment hanger tooling technology
Field.
Background technology
Carburizing, quenching are the important contents of heat treatment process, are generally quenched workpiece using large-scale shaft furnace in practice
Burning hot processing, the general weight of handled workpiece is larger, and needs higher heating temperature and longer heating time.Have
Workpiece even weigh to 2-3 ton, heating temperature reaches 860 DEG C, and the time, common tooling was difficult to bear up to 25 hours.When
Preceding most of toolings can only single-piece hanging production or there are problems that stability, production efficiency are low.
Invention content
It is an object of the invention to：A kind of heat treatment pit-type furnace quenching tooling is provided, more than one piece workpiece can be handled simultaneously, improved
Production efficiency reduces production cost, and workpiece is vacantly hung, and the generation of Heat Treatment Distortion is reduced；Also, the present invention also carries
For a kind of method for making heat treatment pit-type furnace and quenching tooling, the method can improve adaptability of the tooling to heat treatment, and
The stability during tooling hanging workpiece is improved, and simple and easy to operate, saves manpower.
In order to reach object above, technical scheme is as follows：A kind of heat treatment pit-type furnace quenching tooling, including hang
Seat, the sunpender being connect with flap seat set on flap seat lower part, are set to the hanger of sunpender lower part, it is characterised in that：The flap seat is set up in
Outside shaft furnace, the sunpender lower part is located in shaft furnace, and the hanger that bottom is connected is disc-shaped, have in the middle part of the hanger with
The connecting hole of sunpender connection, several to hanging pawl circumferentially around the equiangularly spaced distribution in center, each pair of hang forms hanger between pawl,
It is equipped in the hanger and is interspersed in two and hangs lateral pin between pawl, hanging ring, hanging ring lower part fixing axle zero are equipped in the middle part of the lateral pin
Part；The rugosity d of the hanging ring1（Unit mm）With the quality G of axis part（Units/kg）Relationship meet：G=κ·π·d1 2/ 4,
Middle k is safety coefficient, and value range is 0.8 ~ 0.9；The width d of the hanger2Meet：d1≤d2≤3d1/2.To ensure work
The bearing capacity of dress, when shove charge sunpender pass through bell hole and flap seat together be placed on outside stove, prevent the cooperation of sunpender and bolt from existing
Occurs unstability under the influence of furnace high-temperature；The hanger and axis part of sunpender lower part connection are placed in stove so that axis part
It can be heat-treated.Hanger hangs pawl with multipair, can hang multiple axis part by one-step processing more than one piece workpiece, improve work effect
Rate.Pawl is hung around the equiangularly spaced distribution in hanger center, is conducive to hanger balance, enhances the stability of tooling.Hanging ring rugosity is
The important indicator of its bearing capacity, the two are satisfied with certain relationship, ensure the stability of carrying.In hanger after setting hanging ring,
Therebetween gap width is formed by should not be too large, it is excessive, improve the requirement to lateral pin bearing capacity.
Further, pin hole is equipped at the top of the sunpender, bottom has the supporting block that diameter is more than connection bore dia,
The sunpender is connect by bolt with flap seat.After tooling assembling, supporting block is supported on hanger lower part, plays load-bearing lifting-frame.
Further, the hanging ring is in similar V-arrangement, is overlapped on lateral pin on the inside of apex angle, fixing end is extended in its underpart
It fixes with axis part, is adapted with the outer surface of the lateral pin on the inside of the apex angle of the hanging ring.The hanging ring of V-arrangement has to a certain degree
Stability, match with lateral pin on the inside of hanging ring apex angle, after the fixing axle part of its underpart, hanging ring is not easy double swerve, improves
Axis part consolidates,.
Further, the hanger is sulky derrick, and circumferential direction is angularly distributed three pairs with 120 ° and hangs pawl, its underpart hanging
Axis part gross mass G1≤2600kg.Alternatively, the hanger is quadrangle hanger, circumferential direction is angularly distributed four pairs with 90 °
Hang pawl, the gross mass G of the axis part of its underpart hanging2≤2000kg。
A kind of heat treatment pit-type furnace quenching tooling assembly method, includes the following steps：The first step makes tooling：Making is hung
Seat, flap seat are cast using ZG25 materials, normalized treatment after casting, and normalizing process is：It is 930 DEG C × 3.5H, air-cooled；Bolt is made, is inserted
Pin is formed using 20 steel or A3 steel rollings；Sunpender is made, sunpender is made using 20 steel forgings, normalized treatment after forging, normalizing process
For：It is 930 DEG C × 3.5H, air-cooled, pin hole is made at the top of sunpender later, machine adds supporting block in bottom；Make hanger, hanger
It is cast using ZG200-400 materials, normalized treatment after casting, normalizing process is：It is 930 DEG C × 3.5H, air-cooled；Make hanging ring, hanging ring
It is formed using 20 steel rollings；Lateral pin is made, lateral pin is formed using 20 steel rollings；Second step, assembly tool：By sunpender top under
The connecting hole being up inserted into the middle part of hanger makes the supporting block of its bottom abut hanger, and sunpender top alignment flap seat bottom uses
Bolt connects；Third walks, installation axle part：Preheat axis part, after preheating at the top of axis part welding hanging ring, by hanging ring after welding
Penetrate two hang pawl between, then intert lateral pin between pawl in each pair of hang of hanger, lateral pin allowed to pass through hanging ring hole；It 4th, places
Tooling；Hanger and its axis part hung are put into inside shaft furnace, and adjust its height so that the pin hole at the top of sunpender
It is located at outside shaft furnace with bolt, then fixes flap seat.
Further, in third step：Before preheating axis part, axis part to be mounted needed for artificial judgment
Number, and the welding hanging ring at the top of axis part；If hanger quantity be even number, hung in each hanger axis part or
Person's hanging is less than the even number axis part of hanger quantity and hangs axis part around hanger central symmetry；If hanger quantity is
Odd number then hangs axis part in each hanger.In this way, be conducive to keep the balance of tooling, stability.
Further, the hanging ring lower part is welded and fixed with axis part, and fusion length L value ranges are 120 ~ 150mm.
Fusion length meets the condition can then be will not fall off with holding shaft part.
Further, the axis part preheating temperature is 450 DEG C, time 2h ~ 4h.Preheating helps to improve the essence of axis part
Degree.
Description of the drawings
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein：
Fig. 1 is that embodiment one quenches tooling overall structure diagram；
Fig. 2 is one axis part hanging structure schematic diagram of embodiment；
Fig. 3 is one sulky derrick structural schematic diagram of embodiment；
Fig. 4 is two or four jiaos of hanger structure schematic diagrames of embodiment.
In figure：1 flap seat, 2 sunpenders, 2-1 pin holes, 2-2 supporting blocks, 3 sulky derricks, 3-1 sulky derrick connecting holes, 3-2
Sulky derrick hangs pawl, 3-3 sulky derrick hangers, 4 four jiaos of hangers, tetra- jiaos of hanger connecting holes of 4-1, and tetra- jiaos of hangers of 4-2 hang pawl,
Tetra- jiaos of hanger hangers of 4-3,5 lateral pins, 6 hanging rings, 7 axis parts, 8 bolts.
Specific implementation mode
Embodiment one
For a better understanding of the present invention, the specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.
As shown in Figure 1 to Figure 3, a kind of heat treatment pit-type furnace quenches tooling, including flap seat 1, hangs set on what 1 lower part of flap seat was connect with flap seat
Bar 2 is set to the sulky derrick 3 of 2 lower part of sunpender, and flap seat 1 is set up in outside shaft furnace, and 2 lower part of sunpender is located in shaft furnace.
As shown in figure 3, the sulky derrick 3 that its bottom is connected is disc-shaped, there is the triangle being connect with sunpender 2 to hang at middle part
Frame connecting hole 3-1 is spaced apart three pairs of sulky derricks with hexagonal angle degree circumferentially around center and hangs pawl 3-2, each pair of shape between hanging pawl
At sulky derrick hanger 3-3, in be equipped with and be interspersed in two and hang lateral pin 5 between pawl, 5 middle part of lateral pin is equipped with hanging ring 6, hanging ring 6
Gross mass G is fixed in lower part1Axis part 7 equal to 2600kg.The rugosity d of hanging ring 61（Unit mm）With the quality G of axis part（Unit
kg）Relationship meet：G=κ·π·d1 2/ 4, wherein k are safety coefficient, value 0.85；The width of sulky derrick hanger 3-3
d2Meet：d2=6d1/5.6 rugosity of hanging ring is the important indicator of its bearing capacity, and the two meets the relationship, ensures the firm of carrying
Property.To ensure the bearing capacity of tooling, sunpender 2 is placed on outside stove across bell hole with flap seat 1 together when shove charge, prevents sunpender 2
There is unstability under the influence of furnace high-temperature in cooperation with bolt 8；The sulky derrick 3 and axis part of 2 lower part of sunpender connection
It is placed in stove so that axis part 7 can be heat-treated.Sulky derrick 3 can once hang three axis part processing, improve work
Make efficiency.Sulky derrick hangs pawl 3-2 around the equiangularly spaced distribution in 3 center of sulky derrick, must all overwork 3 when heat treatment every time
Axis part is conducive to sulky derrick 3 and keeps balance, enhances the stability of tooling.In hanger after setting hanging ring, therebetween
Gap width is formed by should not be too large, it is excessive, improve the requirement to 5 bearing capacity of lateral pin.2 top of sunpender is equipped with pin hole
There is the supporting block 2-2 that diameter is more than sulky derrick connecting hole 3-1 diameters, sunpender 2 to pass through bolt 8 and flap seat 1 for 2-1, bottom
Connection.After tooling assembling, supporting block 2-2 is supported on hanger lower part, plays load-bearing lifting-frame.Hanging ring 6 is in similar V-arrangement, top
It is overlapped on lateral pin 5 on the inside of angle, its underpart is extended fixing end and fixed with axis part 7, apex angle inside and the lateral pin 5 of hanging ring 6
Outer surface is adapted.The hanging ring of V-arrangement has a degree of stability, matches with lateral pin 5 on the inside of 6 apex angle of hanging ring, its underpart
After fixing axle part 7, hanging ring 6 is not easy double swerve, improves the stability of axis part.
A kind of heat treatment pit-type furnace quenching tooling assembly method, includes the following steps：The first step makes tooling：Making is hung
Seat 1, flap seat 1 are cast using ZG25 materials, normalized treatment after casting, and normalizing process is：It is 930 DEG C × 3.5H, air-cooled；Bolt 8 is made,
Bolt 8 is formed using 20 steel or A3 steel rollings；Sunpender 2 is made, sunpender 2 is made using 20 steel forgings, normalized treatment after forging, normalizing
Technique is：It is 930 DEG C × 3.5H, air-cooled, pin hole is made at 2 top of sunpender later, machine adds supporting block 2-2 in bottom；It makes
Sulky derrick 3 is cast using ZG200-400 materials, normalized treatment after casting, and normalizing process is：It is 930 DEG C × 3.5H, air-cooled；It makes
Hanging ring 6, hanging ring 6 are formed using 20 steel rollings；Lateral pin 5 is made, lateral pin 5 is formed using 20 steel rollings；Second step, assembly tool：
The sulky derrick connecting hole 3-1 in the middle part of sulky derrick is inserted at 2 top of sunpender from the bottom up, the supporting block 2-2 of its bottom is made to support
3 lower part of sulky derrick is connect, 2 top alignment flap seat of sunpender, 1 bottom is connected using bolt 8；Third walks, installation axle part 7：In advance
Hot axis part 7, axis part preheating temperature are 450 DEG C, time 3h.Before preheating axis part 7, axis to be mounted needed for artificial judgment
7 numbers of part, and in 7 top welding hanging ring of axis part；Due to sulky derrick hanger quantity be odd number, 3, then each
Axis part 7 is hung in sulky derrick hanger 3-3.In this way, be conducive to keep the balance of tooling, stability.
In 7 top welding hanging ring 6 of axis part after preheating, hanging ring is penetrated between two sulky derricks hang pawl 3-2 after welding, then in triangle
Each pair of interspersed lateral pin 5 between hanging pawl of hanger 3, allows lateral pin 5 to pass through hanging ring hole；4th step places tooling；By hanger and its hung
The axis part of extension is put into inside shaft furnace, and adjusts its height so that the pin hole 2-1 and bolt 8 at 2 top of sunpender are located at well formula
Then furnace exterior fixes flap seat.When shove charge sunpender pass through bell hole and flap seat together be placed on outside stove, prevent sunpender and bolt
There is unstability under the influence of furnace high-temperature in cooperation.Hanging ring lower part is welded and fixed with axis part, fusion length L value models
It encloses for 140mm.Fusion length meets the condition can then be will not fall off with holding shaft part.
Embodiment two
As shown in figure 4, hanger is quadrangle hanger 4, middle part has quadrangle hanger connecting hole 4-1, and circumferential direction is with 90 ° of isogonisms
Degree four pairs of quadrangle hangers of distribution hang pawl 4-2, the gross mass G of the axis part of its underpart hanging2=2000kg.Preheat axis part 7 it
Before, 7 numbers of axis part to be mounted needed for artificial judgment, and in 7 top welding hanging ring of axis part；Since quadrangle hanger is hung
Mouthful 4-3 quantity is even number, 4, then in each quadrangle hanger hanger 4-3 can hang axis part 7 or symmetrical
2 axis parts are hung in two hangers.2 or 4 workpiece can once be handled.The present embodiment rest part is the same as embodiment one.
Quadrangle hanger can sling 2 or 4 axis parts simultaneously, improve heat treatment efficiency.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, be all fallen within the protection domain of application claims.
Claims (8)
1. a kind of heat treatment pit-type furnace quenches tooling assembly method, tooling is quenched for assembling heat treatment pit-type furnace, at the heat
It includes flap seat to manage shaft furnace quenching tooling（1）, the sunpender that is connect with flap seat set on flap seat lower part（2）, set on hanging for sunpender lower part
Frame, the flap seat（1）It is set up in outside shaft furnace, the sunpender（2）Lower part is located in shaft furnace, and the hanger that bottom is connected is in
Plate-like, the hanger middle part has and sunpender（2）The connecting hole of connection, it is several to hanging circumferentially around the equiangularly spaced distribution in center
Pawl, each pair of hang form hanger between pawl, are equipped in the hanger and are interspersed in two and hang lateral pin between pawl, in the middle part of the lateral pin
Equipped with hanging ring, hanging ring lower part fixing axle part；The rugosity d of the hanging ring1Meet with the relationship of the quality G of axis part：G=κ·
π·d12/4, wherein d1The units/kg of unit mm, G, k are that safety coefficient value range is 0.8 ~ 0.9；The width of the hanger
Spend d2Meet：d1≤d2≤3d1/2；Its assembly includes the following steps：
The first step makes tooling：Flap seat is made, flap seat is cast using ZG25 materials, normalized treatment after casting, and normalizing process is：930
DEG C × 3.5H, it is air-cooled；Bolt is made, bolt is formed using 20 steel or A3 steel rollings；Make sunpender, sunpender made using 20 steel forgings and
At, normalized treatment after forging, normalizing process is：It is 930 DEG C × 3.5H, air-cooled, pin hole is made at the top of sunpender later, in bottom machine
Tool processes supporting block；Hanger is made, hanger is cast using ZG200-400 materials, normalized treatment after casting, and normalizing process is：930
DEG C × 3.5H, it is air-cooled；Hanging ring is made, hanging ring is formed using 20 steel rollings；Lateral pin is made, lateral pin is formed using 20 steel rollings；
Second step, assembly tool：By sunpender（2）The connecting hole in the middle part of hanger is inserted at top from the bottom up, makes the support of its bottom
Block（2-2）Hanger is abutted, by sunpender top alignment flap seat（1）Bottom, using bolt（8）Connection；
Third walks, installation axle part（7）：Preheat axis part（7）, in axis part after preheating（7）Top welding hanging ring（6）, weld
Afterwards by hanging ring（6）Penetrate two hang pawl between, then intert lateral pin between pawl in each pair of hang of hanger（5）, allow lateral pin（5）Across hanging
Annular distance；
4th step places tooling；Hanger and its axis part hung are put into inside shaft furnace, and adjust its height so that
Sunpender（2）The pin hole at top（2-1）And bolt（8）Outside shaft furnace, flap seat is then fixed（1）.
2. heat treatment pit-type furnace according to claim 1 quenches tooling assembly method, it is characterised in that：It is walked in the third
In：Before preheating axis part, axis parts count to be mounted needed for artificial judgment, and the welding hanging ring at the top of axis part（6）；
If hanger quantity is even number, the even number of axis part or hanging less than hanger quantity is hung in each hanger
A axis part simultaneously hangs axis part around hanger central symmetry；If hanger quantity is odd number, hung in each hanger
Hanging scroll part.
3. heat treatment pit-type furnace according to claim 2 quenches tooling assembly method, it is characterised in that：The hanging ring（6）
Lower part and axis part（7）It is welded and fixed, fusion length L value ranges are 120 ~ 150mm.
4. heat treatment pit-type furnace according to claim 3 quenches tooling assembly method, it is characterised in that：The axis part is pre-
Hot temperature is 450 DEG C, time 2H ~ 4H.
5. heat treatment pit-type furnace according to claim 4 quenches tooling assembly method, it is characterised in that:At the top of the sunpender
Equipped with pin hole（2-1）, bottom has the supporting block for having a diameter larger than connection bore dia（2-2）, the sunpender（2）By inserting
Pin（8）With flap seat（1）Connection.
6. heat treatment pit-type furnace according to claim 5 quenches tooling assembly method, it is characterised in that：The hanging ring（6）
In similar V-arrangement, lateral pin is overlapped on the inside of apex angle（5）On, its underpart is extended fixing end and is fixed with axis part, the hanging ring
（6）Apex angle on the inside of with the lateral pin（5）Outer surface be adapted.
7. heat treatment pit-type furnace according to claim 6 quenches tooling assembly method, it is characterised in that：The hanger is three
Angle hanger（3）, circumferential direction is angularly distributed three pairs with 120 ° and hangs pawl, and the gross mass G1 of the axis part of its underpart hanging≤
2600kg。
8. heat treatment pit-type furnace according to claim 7 quenches tooling assembly method, it is characterised in that：The hanger is four
Angle hanger（4）, circumferential direction is angularly distributed four pairs with 90 ° and hangs pawl, and the gross mass G2 of the axis part of its underpart hanging≤
2000kg。
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| CN107619917B (en) * | 2017-09-28 | 2023-08-18 | 重庆市云阳曲轴有限责任公司 | Frock is used in connecting rod heating |
| CN110129533A (en) * | 2019-05-15 | 2019-08-16 | 南京中船绿洲机器有限公司 | A kind of heat treatment pit-type furnace built-in type quenching tooling and its assembly method |
| CN113699354A (en) * | 2021-09-27 | 2021-11-26 | 南京中船绿洲机器有限公司 | Heat treatment pit furnace single part built-in quenching tool and assembly method |
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| CN202465809U (en) * | 2012-01-19 | 2012-10-03 | 淄博元绪冶金机械有限公司 | Well type thermal-treatment lifting device |
| CN205528911U (en) * | 2016-01-20 | 2016-08-31 | 辽宁五一八内燃机配件有限公司 | Bent axle pit furnace quenching hoist |
| CN206244834U (en) * | 2016-10-20 | 2017-06-13 | 南京中船绿洲机器有限公司 | A kind of heat treatment pit-type furnace quenching frock |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0400619B1 (en) * | 2004-01-30 | 2009-05-05 | pit furnace closing system. |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202465809U (en) * | 2012-01-19 | 2012-10-03 | 淄博元绪冶金机械有限公司 | Well type thermal-treatment lifting device |
| CN205528911U (en) * | 2016-01-20 | 2016-08-31 | 辽宁五一八内燃机配件有限公司 | Bent axle pit furnace quenching hoist |
| CN206244834U (en) * | 2016-10-20 | 2017-06-13 | 南京中船绿洲机器有限公司 | A kind of heat treatment pit-type furnace quenching frock |
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