CN105420482A - Steel ball heat treatment device and process - Google Patents

Steel ball heat treatment device and process Download PDF

Info

Publication number
CN105420482A
CN105420482A CN201610042934.0A CN201610042934A CN105420482A CN 105420482 A CN105420482 A CN 105420482A CN 201610042934 A CN201610042934 A CN 201610042934A CN 105420482 A CN105420482 A CN 105420482A
Authority
CN
China
Prior art keywords
steel ball
furnace
cooling
discharge port
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610042934.0A
Other languages
Chinese (zh)
Inventor
徐洁
徐忠良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangyin Dong Bang Steel Ball Machinery Co Ltd
Original Assignee
Jiangyin Dong Bang Steel Ball Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangyin Dong Bang Steel Ball Machinery Co Ltd filed Critical Jiangyin Dong Bang Steel Ball Machinery Co Ltd
Priority to CN201610042934.0A priority Critical patent/CN105420482A/en
Publication of CN105420482A publication Critical patent/CN105420482A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/36Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers

Landscapes

  • 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)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

The invention relates to a steel ball heat treatment device. The steel ball heat treatment device comprises a cooling and transporting device, an intermediate frequency heating furnace and a reheating furnace, wherein the cooling and transporting device comprises a cooling and transporting device charging opening and a cooling and transporting device discharging opening; the cooling and transporting device discharging opening is communicated with a feeding device of the intermediate frequency heating furnace; an intermediate frequency heating furnace discharging opening is connected with a reheating furnace charging opening. The steel ball heat treatment device disclosed by the invention is simple and reasonable in structural design; the cooling and transporting device is capable of satisfying the demand of a steel ball crossing a C-curve before quenching, greatly improving the self performances of the steel ball, decreasing the whole investment cost of equipment and greatly improving the production efficiency of the steel ball. A steel ball heat treatment process disclosed by the invention is reasonable in process design and is capable of greatly improving the quality of the steel ball.

Description

A kind of steel ball hot treatment unit and technique
Technical field
The present invention relates to metal products processing unit (plant) and technology field, particularly relate to a kind of steel ball hot treatment unit and technique.
Background technology
In steel ball production process, usually the starting material through heating are shaping or through forging round as a ball acquisition steel ball through the rotary-cut of rotary-cut steel ball machine, the steel ball of temperature of being had a surplus by band more directly quenches, the technique of this direct quenching makes steel ball cannot realize the object of C curve, and its performance cannot meet concrete service requirements.
Summary of the invention
For solving in prior art the above-mentioned technical problem existed, the invention provides a kind of steel ball can be made more superior steel ball hot processing device and complete processing.The present invention is achieved through the following technical solutions:
A kind of steel ball hot treatment unit, comprise cooling conveyer, intermediate-frequency heating furnace and reheating furnace, described cooling conveyer comprises cooling conveyer opening for feed and cooling conveyer discharge port, described cooling conveyer discharge port is communicated with intermediate-frequency heating furnace feeding unit, and intermediate-frequency heating furnace discharge port is connected with reheating furnace opening for feed.
Further, described cooling conveyer is worm conveyor, and described worm conveyor comprises steel ball haulage system and steel ball cooling system.
Further, described steel ball haulage system comprises conveying axis, and described conveying axis, by motor-driven rotation, described conveying axis is provided with spirane structure, described conveying axis side is provided with carrying roller.
Further, described steel ball cooling system comprises water-cooling system and air cooling system, described water-cooling system is water jacket, the air-cooled pipeline that described air cooling system comprises wind cooling blower and is communicated with wind cooling blower, and described air-cooled pipeline is arranged in the cavity of described water jacket.
Further, described worm conveyor is for being obliquely installed, and described cooling conveying device opening for feed height, lower than described cooling conveying device discharge port height, is provided with venting port in described worm conveyor higher-end.
Further, described intermediate-frequency heating furnace feeding unit comprises charging slideway, on described charging slideway, is provided with feeding device and material-pulling device.
Further, described reheating furnace comprises furnace shell, described furnace shell two ends are provided with reheating furnace opening for feed and reheating furnace discharge port, in described furnace shell, be provided with the steel ball passage pipe being communicated with described reheating furnace opening for feed and described reheating furnace discharge port, in described furnace shell, be provided with heating system.
Further, described reheating furnace is for being obliquely installed, and described reheating furnace opening for feed, higher than described reheating furnace discharge port, is provided with kickoff at described reheating furnace opening for feed, described, process furnace discharge port is provided with liftable discharging mechanism.
The invention also discloses a kind of steel ball heat treatment process utilizing above-mentioned steel ball hot treatment unit, comprise the steps:
Step one: shaping steel ball is cooled by cooling conveyer;
Step 2: steel ball is heated to 750-900 DEG C in intermediate-frequency heating furnace;
Step 3: the steel ball after heating is incubated in reheating furnace;
Step 4: the steel ball after being incubated carries out quench treatment.
Further, described steel ball is heated to 800-850 DEG C in described intermediate-frequency heating furnace.
The invention has the beneficial effects as follows:
Steel ball hot treatment unit disclosed in this invention, structure design advantages of simple, cooling conveyer can meet the requirement that C-curve crossed by steel ball before quenching, greatly improve the performance of steel ball self, rotary heating furnace of the prior art is changed to intermediate-frequency heating furnace, reduce the input cost of Whole Equipment, greatly improve the production efficiency of steel ball, to process the steel ball of φ more than 100, per minute can produce 60-70 steel ball, can meet the demand of user.Steel ball heat treatment process disclosed in this invention, technological design is reasonable, greatly improves the quality of steel ball.
Accompanying drawing explanation
Fig. 1 is steel ball hot treatment unit structural representation disclosed by the invention;
Fig. 2 is steel ball hot treatment unit worm conveyor front view disclosed by the invention;
Fig. 3 is steel ball hot treatment unit worm conveyor right view disclosed by the invention;
Fig. 4 is steel ball hot treatment unit worm conveyor vertical view disclosed by the invention;
Fig. 5 is steel ball hot treatment unit intermediate-frequency heating furnace structural representation disclosed by the invention;
Fig. 6 is steel ball hot treatment unit reheating furnace front view disclosed by the invention;
Fig. 7 is steel ball hot treatment unit reheating furnace right view disclosed by the invention;
Fig. 8 is steel ball hot treatment unit reheating furnace vertical view disclosed by the invention.
Wherein:
1-steel ball; 10-worm conveyor; 11-opening for feed; 12-discharge port; 13-motor; 14-bearing support; 15-venting hole; 16-conveying axis; 17-water jacket; 18-air-cooled pipeline; 19-spirane structure; 20-carrying roller; 21-wind cooling blower; 22-center-aisle; 23-versatile spindle; 30-intermediate-frequency heating furnace; 31-opening for feed; 32-discharge port; 33-slideway; 34-charging cylinder; 35-pusher cylinder; 50-reheating furnace; 51-opening for feed, 52-discharge port; 53-kickoff; 54-furnace shell; 55-furnace lining; 56-steel ball passage pipe; 57-baffle plate; 58-lifting cylinder.
Embodiment
Describe the present invention below in conjunction with accompanying drawing, to help understanding content of the present invention, the description of this part is only exemplary and explanatory, should not have any restriction to protection scope of the present invention.
As shown in Figure 1, a kind of steel ball hot treatment unit, importantly comprise cooling conveyer, intermediate-frequency heating furnace 30 and reheating furnace 50 3 part, wherein, cooling conveyer comprises cooling conveyer opening for feed 11 and cooling conveyer discharge port 12, and cooling conveyer discharge port 12 is communicated with intermediate-frequency heating furnace feeding unit, and intermediate-frequency heating furnace discharge port 32 is connected with reheating furnace opening for feed 51.
As a kind of preferred version of embodiment of the present invention, as in Figure 2-4, cooling conveyer is worm conveyor 10, and worm conveyor 10 comprises steel ball haulage system and steel ball cooling system.Wherein, steel ball cooling system comprises water-cooling system and air cooling system, in the present embodiment, water-cooling system is the shell be made up of water jacket 17, install for the ease of inner miscellaneous part, shell is set to the two sections that can separate, the setting of water jacket 17 can accelerate the speed of cooling of steel ball 1.Simultaneously, the air-cooled pipeline 18 that air cooling system comprises wind cooling blower 21 and is communicated with wind cooling blower 21, air-cooled pipeline 18 is arranged in the cavity of water jacket 17, by cold wind blower fan 21, cold wind is delivered to air-cooled pipeline 18, carry out dual-cooled in conjunction with water jacket 17 pairs of steel balls 1, the cooling efficiency of steel ball 1 can be improved greatly.Steel ball haulage system comprises the conveying axis 16 being arranged on water jacket 17 inside cavity, conveying axis 16 is driven by the motor 13 be arranged on outside water jacket 17 and rotates, concrete, conveying axis 16 is connected by universal joint 23 with motor 13, and bearing support 14 is set in conveying axis 16 end, conveying axis 16 is supported.Conveying axis 16 is provided with spirane structure 19, and described spirane structure 19 can be spirally wound on conveying axis 16 by steel disc and obtain.Conveying axis 16 side is provided with carrying roller 20, spirane structure 19 is combined with carrying roller 20 and supports the steel ball 1 of the side of being placed on it, meanwhile, when conveying axis 16 rotates, spirane structure 19 also rotates thereupon, and then drives steel ball 1 above it along conveying axis 16 axial motion.
Consider hot gas rising problem, by worm conveyor 10 for being obliquely installed, opening for feed 11 height is lower than discharge port 12 height, worm conveyor 10 higher-end is provided with venting port 15 simultaneously, the hot gas in water jacket 17 cavity is discharged by venting port 15, simultaneously, due to the peculair motion characteristic of spirane structure 19, steel ball 1 to be hoisted motion from lower, can be more stable, prevent steel ball 1 from the generation of spirane structure 19 dropping situations.
As shown in Figure 4, in this example, cool more for a long time to make steel ball 1, conveying axis 16 is set to two, certainly, according to concrete needs, the quantity of conveying axis 16 also can adjust, middle slide 22 is provided with between two conveying axis 16, as shown in the figure, the conveying axis 16 of next-door neighbour's opening for feed 11 is called the first conveying axis, next-door neighbour's discharge port 12 conveying axis 16 is called the second conveying axis, then middle slide 22 is arranged between first higher one end of conveying axis and the lower one end of the second conveying axis, steel ball 1 is made in middle slide 22, to utilize self gravitation to slide.
As shown in Figure 5, the feeding unit of intermediate-frequency heating furnace 30 comprises charging slideway 33, charging slideway 33 is provided with feeding device and material-pulling device, concrete, charging slideway 33 is inclined-plane passage, steel ball 1 out enters intermediate-frequency heating furnace 30 by charging slideway 33 from worm conveyor 10 discharge port 12 afterwards, charging slideway 33 is also provided with feeding device and material-pulling device, in the present embodiment, feeding device is material loading cylinder 34, certainly, also can be electric pushrod or other devices, material loading cylinder 34 promotes slide block by lifting and moves up and down, and then by steel ball 1 feeding-passage point expecting the opening for feed 31 of intermediate frequency furnace 30 one by one, simultaneously, feeding-passage is also provided with material-pulling device, in this example, material-pulling device is pusher cylinder 35 and baffle plate, baffle plate is promoted by pusher cylinder 35, and then steel ball 1 is pushed in intermediate-frequency heating furnace 30.
As shown in figs 6-8, reheating furnace 50 comprises furnace shell 54, furnace lining 55 is provided with inside furnace shell 54, reheating furnace opening for feed 51 and reheating furnace discharge port 52 is provided with at furnace shell 54 two ends, the steel ball passage pipe 56 being communicated with reheating furnace opening for feed 51 and reheating furnace discharge port 52 is provided with in furnace shell 54, steel ball passage pipe 56 is cast for high temperature steel and is formed, self gravitation can be utilized to slide into discharge port 52 from opening for feed 51 to make steel ball 1, steel ball passage pipe 56 is needed to be set to have constant slope, make the height of opening for feed 51 higher than the height of discharge port 52, simultaneously, in order to improve the capacity of reheating furnace 50, steel ball passage pipe 56 is set to many, in this example, steel ball passage pipe 56 is 3, heating system is provided with in furnace shell 54, can need to adopt electrically heated or gas heating mode to heat according to user.
Reheating furnace opening for feed 51 is provided with kickoff 53, by the form such as electric pushrod or hydro-cylinder, steel ball 1 is allocated in steel ball passage pipe 56 uniformly.Process furnace discharge port 52 is being provided with liftable discharging mechanism, concrete, liftable discharging mechanism comprises the baffle plate 57 being arranged on discharge port and the lifting cylinder 58 be arranged on below baffle plate 57, when obtaining discharging signal, lifting cylinder 58 is elevated a stroke, and a steel ball 1 is sent stove from discharge port 52.
The invention also discloses a kind of steel ball heat treatment process utilizing above-mentioned steel ball hot treatment unit, comprise the steps:
Step one: shaping steel ball 1 is cooled by cooling conveyer; Concrete, steel ball 1 enters from the opening for feed 11 of worm conveyor 10, rotated by conveying axis 16 and drive spirane structure 19, and then drive steel ball 1 to move axially along conveying axis 16, now, steel ball 1 carries out heat exchange cooling by air-cooled pipeline 18 and water jacket 17, after steel ball 1 cools, steel ball 1 is delivered to discharge port 12 by the spirane structure 19 on conveying axis 16, and is sent into one by one in intermediate-frequency heating furnace 30 by steel ball 1 by charging cylinder 34 and pusher cylinder 35 through being arranged on the charging slideway 33 outside intermediate-frequency heating furnace 30 opening for feed 31;
Step 2: steel ball 1 is heated to 750-900 DEG C in intermediate-frequency heating furnace 30, preferable temperature is 800-850 DEG C;
Step 3: the steel ball 1 after heating from intermediate-frequency heating furnace discharge port 32 out after, by kickoff 53 one by one through reheating furnace 50 opening for feed 51 send in steel ball passage pipe 56 be incubated;
Step 4: the steel ball 1 after being incubated is sent from reheating furnace discharge port 52 and carried out quench treatment.
Finally it should be noted that, the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a steel ball hot treatment unit, it is characterized in that: comprise cooling conveyer, intermediate-frequency heating furnace and reheating furnace, described cooling conveyer comprises cooling conveyer opening for feed and cooling conveyer discharge port, described cooling conveyer discharge port is communicated with intermediate-frequency heating furnace feeding unit, and intermediate-frequency heating furnace discharge port is connected with reheating furnace opening for feed.
2. a kind of steel ball hot treatment unit according to claim 1, it is characterized in that: described cooling conveyer is worm conveyor, described worm conveyor comprises steel ball haulage system and steel ball cooling system.
3. a kind of steel ball hot treatment unit according to claim 2, it is characterized in that: described steel ball haulage system comprises conveying axis, described conveying axis, by motor-driven rotation, described conveying axis is provided with spirane structure, described conveying axis side is provided with carrying roller.
4. a kind of steel ball hot treatment unit according to claim 2, it is characterized in that: described steel ball cooling system comprises water-cooling system and air cooling system, described water-cooling system is water jacket, the air-cooled pipeline that described air cooling system comprises wind cooling blower and is communicated with wind cooling blower, described air-cooled pipeline is arranged in the cavity of described water jacket.
5. a kind of steel ball hot treatment unit according to claim 2, it is characterized in that: described worm conveyor is for being obliquely installed, described cooling conveying device opening for feed height, lower than described cooling conveying device discharge port height, is provided with venting port in described worm conveyor higher-end.
6. a kind of steel ball hot treatment unit according to claim 2, is characterized in that: described intermediate-frequency heating furnace feeding unit comprises charging slideway, on described charging slideway, is provided with feeding device and material-pulling device.
7. a kind of steel ball hot treatment unit according to claim 1, it is characterized in that: described reheating furnace comprises furnace shell, described furnace shell two ends are provided with reheating furnace opening for feed and reheating furnace discharge port, in described furnace shell, be provided with the steel ball passage pipe being communicated with described reheating furnace opening for feed and described reheating furnace discharge port, in described furnace shell, be provided with heating system.
8. a kind of steel ball hot treatment unit according to claim 7, it is characterized in that: described reheating furnace is for being obliquely installed, described reheating furnace opening for feed is higher than described reheating furnace discharge port, described reheating furnace opening for feed is provided with kickoff, described, process furnace discharge port is provided with liftable discharging mechanism.
9. adopt a steel ball heat treatment process for the steel ball hot treatment unit in claim 1-8 described in any one, it is characterized in that: comprise the steps:
Step one: shaping steel ball is cooled by cooling conveyer;
Step 2: steel ball is heated to 750-900 DEG C in intermediate-frequency heating furnace;
Step 3: the steel ball after heating is incubated in reheating furnace;
Step 4: the steel ball after being incubated carries out quench treatment.
10. steel ball heat treatment process according to claim 9, is characterized in that: described steel ball is heated to 800-850 DEG C in described intermediate-frequency heating furnace.
CN201610042934.0A 2016-01-22 2016-01-22 Steel ball heat treatment device and process Pending CN105420482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610042934.0A CN105420482A (en) 2016-01-22 2016-01-22 Steel ball heat treatment device and process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610042934.0A CN105420482A (en) 2016-01-22 2016-01-22 Steel ball heat treatment device and process

Publications (1)

Publication Number Publication Date
CN105420482A true CN105420482A (en) 2016-03-23

Family

ID=55499016

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610042934.0A Pending CN105420482A (en) 2016-01-22 2016-01-22 Steel ball heat treatment device and process

Country Status (1)

Country Link
CN (1) CN105420482A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105710142A (en) * 2016-04-22 2016-06-29 江苏钰特耐磨科技有限公司 High temperature steel ball cooling machine
CN108044004A (en) * 2017-11-17 2018-05-18 江阴东邦钢球机械有限公司 A kind of ball rolling system and its rolling mill practice

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101177726A (en) * 2007-12-10 2008-05-14 陈刚 Steel ball quenching machine
CN104046753A (en) * 2014-06-30 2014-09-17 江阴东邦钢球机械有限公司 Steel ball reheating furnace and steel ball production line
CN104060060A (en) * 2014-06-30 2014-09-24 江阴东邦钢球机械有限公司 Heat treatment cooling device
CN104164552A (en) * 2014-08-08 2014-11-26 苏州中门子科技有限公司 Quenching system used in steel ball production
CN204080034U (en) * 2014-09-19 2015-01-07 常熟市非凡金属制品有限公司 There is the steel ball quenching device to intermediate frequency furnace refrigerating function
CN104263892A (en) * 2014-09-19 2015-01-07 常熟市非凡金属制品有限公司 Matched structure of cooling device of intermediate frequency furnace for heating steel bar and steel ball quenching device
CN104372145A (en) * 2014-11-19 2015-02-25 江阴东邦钢球机械有限公司 Control structure of heating chamber of steel ball reheating furnace
CN205528939U (en) * 2016-01-22 2016-08-31 江阴东邦钢球机械有限公司 Steel ball heat treatment device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101177726A (en) * 2007-12-10 2008-05-14 陈刚 Steel ball quenching machine
CN104046753A (en) * 2014-06-30 2014-09-17 江阴东邦钢球机械有限公司 Steel ball reheating furnace and steel ball production line
CN104060060A (en) * 2014-06-30 2014-09-24 江阴东邦钢球机械有限公司 Heat treatment cooling device
CN104164552A (en) * 2014-08-08 2014-11-26 苏州中门子科技有限公司 Quenching system used in steel ball production
CN204080034U (en) * 2014-09-19 2015-01-07 常熟市非凡金属制品有限公司 There is the steel ball quenching device to intermediate frequency furnace refrigerating function
CN104263892A (en) * 2014-09-19 2015-01-07 常熟市非凡金属制品有限公司 Matched structure of cooling device of intermediate frequency furnace for heating steel bar and steel ball quenching device
CN104372145A (en) * 2014-11-19 2015-02-25 江阴东邦钢球机械有限公司 Control structure of heating chamber of steel ball reheating furnace
CN205528939U (en) * 2016-01-22 2016-08-31 江阴东邦钢球机械有限公司 Steel ball heat treatment device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105710142A (en) * 2016-04-22 2016-06-29 江苏钰特耐磨科技有限公司 High temperature steel ball cooling machine
CN108044004A (en) * 2017-11-17 2018-05-18 江阴东邦钢球机械有限公司 A kind of ball rolling system and its rolling mill practice

Similar Documents

Publication Publication Date Title
JP5053011B2 (en) Temperature control method for reduced iron for hot forming
CN102297583B (en) Steam oxidation well furnace
CN205295391U (en) Inert gas protection annealing stove
CN103424001A (en) High-temperature material vertical cooler and waste heat using system
CN104477885A (en) Vertical continuous induction type high-temperature graphitization furnace
CN103695581A (en) Process and equipment for slag granulation and sensible heat recovery of blast furnace
CN105420482A (en) Steel ball heat treatment device and process
CN105400945B (en) A kind of major diameter oblique milling ball milling steel ball heat treatment system
CN114042925A (en) Preheating device for atomization chamber
CN201648470U (en) Gear ring nitrogen-protecting continuous normalizing furnace
CN205528939U (en) Steel ball heat treatment device
CN103966414A (en) Compound steel ball tempering process by using waste heat
CN201250251Y (en) Vacuum degreasing sintering-quenching integrated furnace
CN203890412U (en) Rotating disc type steel ball quench heating furnace
CN101797647A (en) Vertical multi-channel ultrahigh-temperature induction-heating continuous spheroidizing furnace
CN201592255U (en) Vertical multi-channel ultra-high temperature induction heating continuous spheroidization furnace
CN106498183A (en) Process the system of lateritic nickel ore and its application in lateritic nickel ore is processed
CN105352316A (en) Drive heating furnace with screw motion type conveying belt
CN105349773A (en) Cooling and drying synchronizing method for rotary hearth furnace
CN101358270A (en) Vacuum degreasing sintered quenching integrated furnace
CN201735799U (en) Vertical extra-high temperature continuous spheroidizing furnace
CN103805727A (en) Direct reduction iron hot-charging method by use of chain conveyer
CN205138187U (en) Conveyer belt spiral conveying type transmission heating furnace
US4157111A (en) Method of heat-treating ductile cast iron pipe
CN210314378U (en) Multi-level hot work die steel heat treatment forging furnace

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160323

RJ01 Rejection of invention patent application after publication