CN210117397U - Quenching and tempering connecting device for bright silver steel bar - Google Patents
Quenching and tempering connecting device for bright silver steel bar Download PDFInfo
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- CN210117397U CN210117397U CN201920612050.3U CN201920612050U CN210117397U CN 210117397 U CN210117397 U CN 210117397U CN 201920612050 U CN201920612050 U CN 201920612050U CN 210117397 U CN210117397 U CN 210117397U
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- material turning
- steel bar
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- conveying
- quenching
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- 238000005496 tempering Methods 0.000 title claims abstract description 41
- 238000010791 quenching Methods 0.000 title claims abstract description 37
- 230000000171 quenching effect Effects 0.000 title claims abstract description 37
- 229910000971 Silver steel Inorganic materials 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 122
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052709 silver Inorganic materials 0.000 claims abstract description 9
- 239000004332 silver Substances 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims description 60
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000007306 turnover Effects 0.000 claims description 2
- 229910001566 austenite Inorganic materials 0.000 abstract description 7
- 230000032683 aging Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000717 retained effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241001226615 Asphodelus albus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The utility model relates to a quenching and tempering connecting device for a bright silver steel bar, which comprises a first conveying device, a second conveying device and a connecting device, wherein the first conveying device comprises a first bracket and a plurality of first conveying rollers; the material turning device comprises a material turning frame, a first air cylinder and a material turning part; the upper surface of the material turning frame is obliquely and downwards inclined along the material turning direction of the bright steel bar, and a plurality of first bearing seats are arranged on the side surface, close to the first conveying device, of the material turning frame at equal height; the first air cylinder is arranged at the bottom of the material turning through a hinge; an extension rod is fixedly arranged at the top of a first cylinder rod on the first cylinder in an extending manner; the material turning part comprises a first rotating rod, a plurality of material turning rods and a first connecting part; a plurality of material turning rods are fixed on the first rotating rod at equal intervals; a second transfer device. The utility model discloses a bright steel bar quenching and tempering connecting device of silver for the whole ageing stabilities that produce of the very small amount of retained austenite that gets off of last surplus, and reduced the handling number of times, practiced thrift the energy consumption, reduce the labour, improve the operating efficiency.
Description
Technical Field
The utility model relates to a heat treatment tool equipment technical field especially relates to a bright steel bar quenching and tempering connecting device of silver.
Background
Quenching and tempering are two heat treatment processes that are widely used in production and are usually closely coupled together. Through quenching and tempering, the internal structure of the steel is changed, so that the workpiece obtains good mechanical properties, and the potential of material properties is better exerted.
After quenching, in order to reduce the residual austenite to the minimum and prevent the loss of precision caused by overlarge size change in the using process, the method of low-temperature tempering and aging treatment can be adopted to ensure that the residual austenite with a very small amount finally remained is aged and stabilized. In order to ensure the effect, the silver bright steel bar should be subjected to low-temperature tempering immediately after quenching so as to avoid the thermal stabilization of residual austenite caused by too long residence time at room temperature. The longer the residence time at room temperature, the more severe the thermal stabilization. In the prior art, the quenched material needs to be lifted to a feeding frame of a tempering furnace to continue the next process, the efficiency is low, and the time consumption of the intermediate treatment process is long, so that the thermal stabilization of the retained austenite is serious.
Therefore, it is necessary to design a quenching and tempering connection device for a bright silver steel bar to meet the actual requirement.
Disclosure of Invention
An object of the utility model is to provide a bright steel bar quenching and tempering connecting device of silver can directly defeated to tempering furnace to carry out tempering heat treatment to the bright steel bar after quenching through the stirring device for the remaining few retained austenite that gets off at last all produces ageing stably, and has reduced the handling number of times, has practiced thrift the energy consumption, has reduced the labour, has improved the operating efficiency.
The technical scheme of the utility model is that: a quenching and tempering connecting device for a bright silver steel bar, which comprises,
the first conveying device comprises a first bracket and a plurality of first conveying rollers; the first support is opposite to an outlet of an external quenching furnace, the first conveying rollers are arranged on the first support at equal intervals along the conveying direction of the bright steel bars, two adjacent first conveying rollers are connected through a chain, and any one of the two ends of the first support is positioned on the first support
The first conveying roller is connected with an external driving motor;
the material turning device comprises a material turning frame, a first air cylinder and a material turning part; the upper surface of the material turning frame is obliquely and downwards inclined along the material turning direction of the bright steel bar, and a plurality of first bearing seats are arranged on the side surface, close to the first conveying device, of the material turning frame at equal heights; the first air cylinder is arranged at the bottom of the material turning frame through a hinge; an extension rod is fixedly arranged at the top of a first cylinder rod on the first cylinder in an extending manner; the material turning part comprises a first rotating rod, a plurality of material turning rods and a first connecting part; the first rotating rod is rotatably arranged on a plurality of first bearing seats on the material overturning frame; one end of the first connecting part is fixed in the middle of the first rotating rod, and the other end of the first connecting part is hinged with the top of the extension rod; the plurality of material turning rods are fixed on the first rotating rod at equal intervals;
the second conveying device is arranged on one side, away from the first conveying device, of the material turning frame and comprises a second support and a plurality of second conveying rollers; the second support is opposite to the inlet of the external tempering furnace; a plurality of second transfer rollers are in along the equidistant setting of transmission direction of bright steel bar of silver on the second support, adjacent two the second transfer roller passes through the chain and connects, is located arbitrary at both ends on the second support the second transfer roller links to each other with outside driving motor.
Preferably, a baffle is arranged at the tail end of the first bracket.
Preferably, the first conveying roller has a large end and a small middle and is shaped like an hourglass.
Preferably, the second support is provided with a plurality of limiting rings at equal intervals, each limiting ring is provided with an inlet, and the inlets are opposite to the material turning frame.
Preferably, the second conveying roller is large at two ends and small at the middle and is in an hourglass shape.
Preferably, the material blocking device further comprises a blocking device, the blocking device comprises a plurality of blocking blocks, a second air cylinder, a second connecting part, a second rotating rod, a plurality of connecting rods and a plurality of material blocking pieces, and the number of the blocking blocks and the number of the connecting rods are equal to the number of the material blocking pieces; the plurality of stop blocks are arranged at one end of the material turning frame close to the second conveying device at equal intervals and are opposite to the inlet on the limiting ring; the second air cylinder is reversely hinged to the lower surface of the top of the material turning frame; one end of the second connecting part is hinged to the top of a cylinder rod on the second cylinder, and the other end of the second connecting part is fixed in the middle of the second rotating rod; a plurality of second bearing seats are arranged at the position, close to the second conveying device, of the bottom of the material turning frame along the conveying direction of the bright steel bar, and the second rotating rod is rotatably connected to the second bearing seats; the connecting rods are fixed on the second rotating rod at equal intervals; the material blocking piece comprises a material blocking rod, a sliding part and a material blocking part; the sliding part is arranged at the bottom of the material blocking rod, and the material blocking part is fixed at the top of the material blocking rod; a cylindrical ring is vertically arranged at a corresponding position on the second support, and the material blocking rod is sleeved in the cylindrical ring; the upper surfaces of the connecting rods are provided with sliding grooves matched with the sliding parts, and the material blocking parts are arranged on the sliding grooves in a sliding mode through the sliding parts.
Preferably, the upper surface of the material blocking part is inclined downwards along the transmission direction of the bright silver steel bar.
The utility model discloses a theory of operation does: conveying the bright steel bars from the quenching furnace under the action of a first conveying roller, starting a material turning device when the bright steel bars are completely conveyed out of the quenching furnace, lifting the bright steel bars by a material turning rod on the material turning device, rolling the tail end of a material turning frame along an inclined plane on the material turning frame, and stopping the bright steel bars due to the action of a stop block; starting the blocking device, lifting the bright steel bar by the material blocking part, and rolling the bright steel bar onto the second conveying device along the inclined plane on the material blocking part; due to the action of the limiting ring on the second conveying device, the rolled bright silver steel bar cannot fall off from the second support, and accurately enters the tempering furnace for tempering heat treatment under the conveying of the second conveying device.
The beneficial effects of the utility model reside in that:
1. the utility model can directly convey the quenched bright steel bar to the tempering furnace for tempering heat treatment through the material turning device, and shorten the time for conveying the bright steel bar between quenching and tempering, so that the residual austenite left at last is completely aged and stabilized;
2. the lifting times are reduced, the energy consumption is saved, the labor force is reduced, and the operation efficiency is improved;
3. the utility model provides a connecting device takes up an area of fewly, and easy operation is swift.
Drawings
FIG. 1 is a schematic structural diagram of a first conveying device in an embodiment;
FIG. 2 is a schematic structural view of a first transfer roller in the embodiment;
FIG. 3 is a schematic structural diagram of a material turning device in an embodiment;
FIG. 4 is a schematic structural diagram of a material turning-over part in the embodiment;
FIG. 5 is a schematic structural diagram of the first conveying device and the material turning device in the embodiment;
FIG. 6 is a schematic structural diagram of a quenching and tempering connection device for a bright silver steel bar in an embodiment;
FIG. 7 is a schematic structural view of a blocking device in an embodiment;
FIG. 8 is a schematic structural view of a material blocking member in the embodiment;
fig. 9 is a schematic diagram of the material blocking operation of the material blocking member in the embodiment;
FIG. 10 is a schematic view showing the operation of the quenching and tempering connecting device for the bright silver steel bar in the example 1;
FIG. 11 is an operation schematic diagram 2 of the quenching and tempering connection device for the bright silver steel bar in the embodiment;
FIG. 12 is a schematic view showing the operation of the quenching and tempering connecting device for the bright silver steel bar in the example 3;
FIG. 13 is an operation diagram 4 of the quenching and tempering connection device for the bright silver steel bar in the embodiment;
FIG. 14 is an operation diagram 5 of the quenching and tempering connection device for the bright silver steel bar in the embodiment;
in the figure: 1-a first conveyor, 2-a turning device, 3-a second conveyor, 4-a first support, 5-a first conveyor roller, 6-a baffle, 7-a bright steel bar, 8-a turning frame, 9-a hinge, 10-a first cylinder, 11-an extension rod, 12-a first bearing seat, 13-a turning part, 14-a first rotating rod, 15-a turning rod, 16-a first connecting part, 17-a second support, 18-a second conveyor roller, 19-a limiting ring, 20-an inlet, 21-a second cylinder, 22-a second connecting part, 23-a second rotating rod, 24-a connecting rod, 25-a material blocking part, 26-a second bearing seat, 27-a material blocking rod, 28-a sliding part, 29-a material blocking part, 30-cylindrical ring, 31-stop.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
A quenching and tempering connecting device for bright silver steel bars comprises a first conveying device 1, a material turning device 2 and a second conveying device 3;
as shown in fig. 1, the first conveying device 1 includes a first carriage 4 and a plurality of first conveying rollers 5; the first support 4 is over against the outlet of the external quenching furnace, the first conveying rollers 5 are arranged on the first support 4 at equal intervals along the conveying direction of the bright silver steel bar 7, two adjacent first conveying rollers 5 are connected through a chain, and any one of the first conveying rollers 5 at two ends of the first support 4 is connected with an external driving motor;
it should be noted here that the conveying direction of the bright steel bar 7 is the moving direction of the bright steel bar 7 which is conveyed from the quenching furnace to the first conveying device 1 and then conveyed from the first conveying device 1 to the second conveying device 3 through the turnover device 2, see fig. 10-14.
In order to prevent the bright steel bar 7 from falling off from the tail end of the first bracket 4 in the transmission process, a baffle 6 is arranged at the tail end of the first bracket 4;
as shown in fig. 2, in order to ensure that the bright steel bar 7 does not fall off when being conveyed on the first conveying roller 5, the two ends of the first conveying roller 5 are large, the middle of the first conveying roller is small, and the first conveying roller is shaped like an hourglass, so that the bright steel bar 7 is limited to a certain extent in the conveying process;
as shown in fig. 3, the material turning device 2 comprises a material turning frame 8, a first air cylinder 10 and a material turning part 13; the material turning frame 8 is obliquely and downwards inclined along the material turning direction of the bright steel bar 7, and a plurality of first bearing seats 12 are arranged on the side surface, close to the first conveying device 1, of the material turning frame 8 at equal heights; the first air cylinder 10 is arranged at the bottom of the material turning frame 8 through a hinge 9; in order to ensure that the first cylinder 10 has enough elongation, an elongation rod 11 is fixedly extended from the top of the first cylinder rod on the first cylinder 10;
for the convenience of understanding, it is specifically stated herein that the direction of overturning the bright steel bar 7 is the moving direction of the bright steel bar 7 which is pushed out of the first conveyor 1 by the overturning part 13 on the overturning device 2 and then rolls obliquely downwards along the overturning part 13 to the overturning frame, see fig. 5.
As shown in fig. 4, the material overturning part 13 comprises a first rotating rod 14, a plurality of material overturning rods 15 and a first connecting part 16; the first rotating rod 14 is rotatably arranged on a plurality of first bearing seats 12 on the material overturning frame 8; one end of the first connecting part 16 is fixed in the middle of the first rotating rod 14, and the other end is hinged with the top of the extension rod 11; the plurality of material turning rods 15 are fixed on the first rotating rod 14 at equal intervals; the matching of the stirring device and the first conveying device is shown in fig. 5.
As shown in fig. 6, the second conveying device 3 is arranged on the side of the turning frame 8 far away from the first conveying device 1, and the second conveying device 3 comprises a second bracket 17 and a plurality of second conveying rollers 18; the second support 17 is just opposite to the inlet of the external tempering furnace, the plurality of second conveying rollers 18 are arranged on the second support 17 at equal intervals along the transmission direction of the bright silver steel bar 7, two adjacent second conveying rollers 18 are connected through a chain, and any one of the second conveying rollers 18 at two ends of the second support 17 is connected with an external driving motor.
In order to prevent the bright silver steel bar 7 falling from the material turning device 2 from falling from the second support 17, a plurality of limiting rings 19 are arranged on the second support 17 at equal intervals, an inlet 20 is arranged on each limiting ring 19, and the inlet is opposite to the material turning frame 8.
In order to ensure that the bright steel bars 7 on the second conveying device 3 accurately enter the inlet of the tempering furnace during the conveying process, the second conveying rollers 18 are large at two ends and small at the middle and are shaped like an hourglass.
Because the processing speed of the bright steel bar 7 in the quenching furnace is obviously faster than that in the tempering furnace, and in the transmission process, the bright steel bar 7 is processed according to the root, the bright steel bar which can temporarily block redundant quenched steel bars is required to be arranged on one side of the material turning frame 8 close to the second support 17, and after the pre-arranged bright steel bars are transported, the blocking device releases the residual bright steel bars according to the root.
Specifically, the inventors have devised a blocking device as follows: as shown in fig. 7-8, the blocking device includes a plurality of blocks 31, a second cylinder 21, a second connecting portion 22, a second rotating rod 23, a plurality of connecting rods 24 and a plurality of material blocking members 25, and the number of the blocks 31 and the number of the connecting rods 24 are equal to the number of the material blocking members 25; the plurality of stoppers 31 are arranged at one end of the material turning frame 8 close to the second conveying device 3 at equal intervals and are opposite to the inlet 20 on the limiting ring 19; the second air cylinder 21 is inversely hinged to the lower surface of the top of the material turning frame 8, one end of the second connecting part 22 is hinged to the top of an air cylinder rod on the second air cylinder 21, and the other end of the second connecting part is fixed to the middle part of the second rotating rod 23; a plurality of second bearing seats 26 are arranged at the position, close to the second conveying device 3, of the bottom of the material overturning frame 8 along the conveying direction of the bright steel bar, and the second rotating rod 23 is rotatably connected to the second bearing seats 26; the connecting rods 24 are fixed on the second rotating rod 23 at equal intervals; the material blocking part 25 comprises a material blocking rod 27, a sliding part 28 and a material blocking part 29, the sliding part 28 is arranged at the bottom of the material blocking rod 27, and the material blocking part 29 is fixed at the top of the material blocking rod 27; a cylindrical ring 30 is vertically arranged at a corresponding position on the second support 17, the material blocking rod 27 is sleeved in the cylindrical ring 30, and the cylindrical ring 30 is arranged to limit the material blocking rod 27 so that the material blocking rod can only vertically move up and down; the upper surfaces of the connecting rods 24 are provided with sliding grooves matched with the sliding parts 28, and the material blocking parts 25 are arranged on the sliding grooves of the connecting rods 24 in a sliding mode through the sliding parts 28.
For further conveying purpose, as shown in fig. 9, the upper surface of the material blocking part 29 is inclined obliquely downwards along the conveying direction of the bright steel bar 7.
Description of the operation: as shown in fig. 10, the bright steel silver rod 7 coming out of the quenching furnace is conveyed by the first conveying roller 5; when the steel bar is completely conveyed out of the quenching furnace, as shown in fig. 11, the material turning device 3 is started, the material turning rod 15 on the material turning device 3 lifts the bright steel bar 7 and rolls the tail end of the material turning frame 8 along the inclined plane on the material turning frame, and at the moment, the steel bar is blocked due to the action of the stop block 31, as shown in fig. 12; as shown in fig. 13, the blocking device is started, and the bright silver steel bar 7 is lifted by the material blocking part 29 and rolls onto the second conveying device 3 along the inclined surface on the material blocking part 29; finally, as shown in fig. 14, the rolled bright silver steel bar is ensured not to fall off the second bracket 17 due to the action of the limiting ring 19 on the second conveying device 3, and accurately enters the tempering furnace for tempering heat treatment under the conveying of the second conveying device 3.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of various modifications and changes without departing from the spirit of the invention.
Claims (7)
1. A quenching and tempering connecting device for a bright silver steel bar is characterized by comprising,
the first conveying device comprises a first bracket and a plurality of first conveying rollers; the first support is opposite to an outlet of an external quenching furnace, the first conveying rollers are arranged on the first support at equal intervals along the conveying direction of the bright steel bars, two adjacent first conveying rollers are connected through a chain, and any one of the first conveying rollers positioned at two ends of the first support is connected with an external driving motor;
the material turning device comprises a material turning frame, a first air cylinder and a material turning part; the upper surface of the material turning frame is obliquely and downwards inclined along the material turning direction of the bright steel bar, and a plurality of first bearing seats are arranged on the side surface, close to the first conveying device, of the material turning frame at equal heights; the first air cylinder is arranged at the bottom of the material turning frame through a hinge; an extension rod is fixedly arranged at the top of a first cylinder rod on the first cylinder in an extending manner; the material turning part comprises a first rotating rod, a plurality of material turning rods and a first connecting part; the first rotating rod is rotatably arranged on a plurality of first bearing seats on the material overturning frame; one end of the first connecting part is fixed in the middle of the first rotating rod, and the other end of the first connecting part is hinged with the top of the extension rod; the plurality of material turning rods are fixed on the first rotating rod at equal intervals;
the second conveying device is arranged on one side, away from the first conveying device, of the material turning frame and comprises a second support and a plurality of second conveying rollers; the second support is opposite to the inlet of the external tempering furnace; a plurality of second transfer rollers are in along the equidistant setting of transmission direction of bright steel bar of silver on the second support, adjacent two the second transfer roller passes through the chain and connects, is located arbitrary at both ends on the second support the second transfer roller links to each other with outside driving motor.
2. The quenching and tempering connection device of the bright silver steel bar as claimed in claim 1, wherein a baffle is arranged at the end of the first bracket.
3. The quenching and tempering connection device for the silver bright steel bar as claimed in claim 1 or 2, wherein the first conveying roller is large at two ends and small at the middle and is hourglass-shaped.
4. The connection device for quenching and tempering of the bright silver steel bar according to claim 1, wherein a plurality of limiting rings are arranged on the second bracket at equal intervals, an inlet is arranged on each limiting ring, and the inlet faces the material turnover frame.
5. The quenching and tempering connection device of the bright silver steel bar according to claim 4, wherein the second conveying rollers are large at two ends and small at the middle and are hourglass-shaped.
6. The connection device for quenching and tempering of the bright silver steel bar according to claim 5, further comprising a blocking device, wherein the blocking device comprises a plurality of blocking blocks, a second cylinder, a second connecting part, a second rotating rod, a plurality of connecting rods and a plurality of material blocking pieces, and the number of the blocking blocks and the number of the connecting rods are equal to the number of the material blocking pieces; the plurality of stop blocks are arranged at one end of the material turning frame close to the second conveying device at equal intervals and are opposite to the inlet on the limiting ring; the second air cylinder is reversely hinged to the lower surface of the top of the material turning frame; one end of the second connecting part is hinged to the top of a cylinder rod on the second cylinder, and the other end of the second connecting part is fixed in the middle of the second rotating rod; a plurality of second bearing seats are arranged at the position, close to the second conveying device, of the bottom of the material turning frame along the conveying direction of the bright steel bar, and the second rotating rod is rotatably connected to the second bearing seats; the connecting rods are fixed on the second rotating rod at equal intervals; the material blocking piece comprises a material blocking rod, a sliding part and a material blocking part; the sliding part is arranged at the bottom of the material blocking rod, and the material blocking part is fixed at the top of the material blocking rod; a cylindrical ring is vertically arranged at a corresponding position on the second support, and the material blocking rod is sleeved in the cylindrical ring; the upper surfaces of the connecting rods are provided with sliding grooves matched with the sliding parts, and the material blocking parts are arranged on the sliding grooves in a sliding mode through the sliding parts.
7. The connection device for quenching and tempering the bright steel bar with silver according to claim 6, wherein the upper surface of the material blocking part is inclined obliquely downwards along the transmission direction of the bright steel bar with silver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920612050.3U CN210117397U (en) | 2019-04-30 | 2019-04-30 | Quenching and tempering connecting device for bright silver steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920612050.3U CN210117397U (en) | 2019-04-30 | 2019-04-30 | Quenching and tempering connecting device for bright silver steel bar |
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| Publication Number | Publication Date |
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| CN210117397U true CN210117397U (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920612050.3U Expired - Fee Related CN210117397U (en) | 2019-04-30 | 2019-04-30 | Quenching and tempering connecting device for bright silver steel bar |
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| CN (1) | CN210117397U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342344A (en) * | 2020-10-15 | 2021-02-09 | 北京金兆博高强度紧固件有限公司 | Tempering treatment equipment for steel slender shaft workpieces |
-
2019
- 2019-04-30 CN CN201920612050.3U patent/CN210117397U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342344A (en) * | 2020-10-15 | 2021-02-09 | 北京金兆博高强度紧固件有限公司 | Tempering treatment equipment for steel slender shaft workpieces |
| CN112342344B (en) * | 2020-10-15 | 2022-04-22 | 北京金兆博高强度紧固件有限公司 | Tempering treatment equipment for steel slender shaft workpieces |
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Granted publication date: 20200228 |