CN114045386A - Environment-friendly heat treatment device for high-ductility and high-strength steel bars - Google Patents
Environment-friendly heat treatment device for high-ductility and high-strength steel bars Download PDFInfo
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- CN114045386A CN114045386A CN202111222959.6A CN202111222959A CN114045386A CN 114045386 A CN114045386 A CN 114045386A CN 202111222959 A CN202111222959 A CN 202111222959A CN 114045386 A CN114045386 A CN 114045386A
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- electric heating
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- steel bar
- cooling
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 64
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 57
- 238000005485 electric heating Methods 0.000 claims abstract description 50
- 239000000779 smoke Substances 0.000 claims abstract description 10
- 239000010865 sewage Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 claims 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 9
- 230000000149 penetrating effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 239000002184 metal Substances 0.000 description 8
- 238000007599 discharging Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241001669679 Eleotris Species 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Classifications
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
- B08B1/165—Scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/20—Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
-
- 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
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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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 invention discloses an environment-friendly heat treatment device for high-ductility and high-strength steel bars, which comprises steel bar heat treatment equipment, wherein the steel bar heat treatment equipment comprises an operation table, electric heating furnaces, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, the electric heating furnaces are respectively provided with a plurality of groups and are uniformly arranged on the operation table, each electric heating furnace comprises a furnace body, a distribution box, a cable and an electric heating ring, the distribution box is arranged at the top of the furnace body and is connected with the electric heating rings through the cable, the electric heating rings are arranged in the furnace body, a penetrating port is formed in the middle of the electric heating rings, the transverse driving mechanism comprises a plurality of groups of drivers, the drivers are arranged between every two adjacent groups of electric heating furnaces, and the cooling box is arranged on the right side of the operation table and comprises a box body and a cooling mechanism arranged on the box body. The heat treatment equipment for the reinforcing steel bar can achieve rapid heating and cooling treatment in the process of conveying the reinforcing steel bar, and ensures the efficiency of heat treatment of the reinforcing steel bar.
Description
Technical Field
The invention relates to the technical field of steel bar heat treatment equipment, in particular to an environment-friendly heat treatment device for high-ductility and high-strength steel bars.
Background
The heat treatment steel bar is formed by quenching, tempering and quenching the hot-rolled medium-carbon low-alloy steel bar, has high strength, material saving, good anchoring property and stable prestress, is mainly used as a prestressed reinforced concrete sleeper and can also be used for prestressed reinforced concrete plates, crane beams and other members, and the heat treatment of the steel bar needs to be carried out by special steel bar heat treatment equipment.
However, the existing apparatus for heat-treating reinforcing bars has the following problems in use: (1) the steel bar is heated by a steel bar heating furnace, however, the operation of feeding and discharging the steel bar is complicated by the heating method, and the efficiency of heating the steel bar is influenced; (2) the metal scraps on the surface of the steel bar are easy to lift in the heating process of the steel bar, and the pollution to the environment is large. For this reason, a corresponding technical scheme needs to be designed to solve the existing technical problems.
Disclosure of Invention
The invention aims to provide an environment-friendly heat treatment device for high-ductility and high-strength steel bars, which solves the technical problems that the steel bars are heated by a steel bar heating furnace, but the heating mode is complicated in steel bar feeding and blanking operation, the heating efficiency of the steel bars is influenced, metal scraps on the surfaces of the steel bars are easy to lift in the heating process of the steel bars, and the environment is polluted greatly.
In order to achieve the purpose, the invention provides the following technical scheme: an environment-friendly heat treatment device for high-ductility and high-strength steel bars comprises steel bar heat treatment equipment, wherein the steel bar heat treatment equipment comprises an operation table, an electric heating furnace, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, the electric heating furnace is respectively provided with a plurality of groups and is uniformly arranged on the operation table, the electric heating furnace consists of a furnace body, a distribution box, a cable and an electric heating ring, the distribution box is arranged at the top of the furnace body and is connected with the electric heating ring through the cable, the electric heating ring is arranged in the furnace body, a penetrating port is formed in the middle of the electric heating ring, the transverse driving mechanism consists of a plurality of groups of drivers, the drivers are arranged between two adjacent groups of electric heating furnaces, the cooling box is arranged on the right side of the operation table and comprises a box body and a cooling mechanism arranged on the box body, the cooling mechanism is connected with a cooling channel through a pipeline, the cooling channel is inserted in the box body and is at the same horizontal height with the penetrating port, flue gas environmental protection processing mechanism is including leading dirty pipeline and setting up in leading the terminal dirty case of storing up of dirty pipeline, evenly install a plurality of groups branch pipe on leading dirty pipeline, a plurality of groups the upper end of branch pipe is connected with the bottom of a plurality of furnace bodies of organizing, one side of operation panel is provided with the PLC controller, the PLC controller is connected with reinforcing bar thermal treatment equipment through the circuit.
As a preferred embodiment of the present invention, the electric heating ring is composed of two groups of heating half rings, the inner walls of the heating half rings are uniformly provided with a plurality of groups of stripping blades, the surfaces of the heating half rings are uniformly provided with a plurality of groups of sewage discharging slots, and the plurality of groups of sewage discharging slots are communicated with the bottom of the furnace body.
In a preferred embodiment of the present invention, the peeling blade has a curved structure as a whole and a blade-like structure on the inner side.
As a preferred embodiment of the present invention, the transverse driving mechanism includes a driving motor and a driving roller mounted at a power output end of the driving motor, wherein a plurality of sets of anti-slip ribs are formed at a middle portion of the driving roller, and the plurality of sets of anti-slip ribs are disposed in a threaded manner.
In a preferred embodiment of the present invention, the cooling mechanism comprises a refrigerator, a cold air duct, and a condenser, the refrigerator is mounted on the top of the cabinet and connected to the condenser through two sets of cold air ducts, and the condenser is disposed in the cooling channel.
As a preferred embodiment of the present invention, the cooling passage has a double-layer structure and includes an outer tube and an inner tube that are nested with each other, an installation groove is formed between the outer tube and the inner tube, the condenser tube is disposed in the installation groove, and the installation groove is filled with a cooling medium.
In a preferred embodiment of the present invention, the condenser pipe is composed of a plurality of sets of sub-cooling pipes, and the plurality of sets of sub-cooling pipes are uniformly installed in the installation groove in an annular shape.
In a preferred embodiment of the present invention, an outer pipe is installed at a connection point between the sewage conduit and the sewage storage tank, the outer pipe is in a trumpet-shaped structure, the diameter of the upper end of the outer pipe is smaller than that of the lower end of the outer pipe, and the lower end of the outer pipe is communicated with the sewage storage tank.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention designs a device for heat treatment of special steel bars, which comprises an operation platform, electric heating furnaces, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, wherein the electric heating furnaces are divided into a plurality of groups and are uniformly arranged on the operation platform, the transverse driving mechanism is arranged between two adjacent groups of electric heating furnaces, the steel bars are inserted into the electric heating furnaces and are subjected to heat treatment through the electric heating furnaces, the steel bars after heat treatment are subjected to transverse displacement through the transverse driving mechanism and reach the inside of the cooling box, the cooling mechanism in the cooling box is used for rapidly cooling the heated steel bars, the transverse driving mechanism at the tail part is used for blanking treatment, and in the process that the steel bars are positioned in the electric heating furnaces for heating, metal attachments on the surfaces of the steel bars can be subjected to glass treatment through glass blades on the inner walls of the electric heating furnaces and are guided into the smoke environment-friendly treatment mechanism, the dirt is stored through the smoke environment-friendly treatment, so that the effect of the equipment on the heat treatment of the reinforcing steel bars is improved.
2. The heat treatment equipment for the reinforcing steel bar can achieve rapid heating and cooling treatment in the process of conveying the reinforcing steel bar, ensures the heat treatment efficiency of the reinforcing steel bar, and improves the working efficiency on the basis of improving the ductility and the strength of the reinforcing steel bar.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a schematic view of the position of the electric heating furnace and the transverse driving mechanism according to the present invention;
FIG. 3 is a view showing an internal structure of an electric heating furnace according to the present invention;
FIG. 4 is a view of the drive roller structure of the present invention;
FIG. 5 is a view of the structure of the stripping blade according to the present invention;
fig. 6 is a view showing the internal structure of the cooling tank according to the present invention.
In the figure, 1, an operation table; 2. a furnace body; 3. a distribution box; 4. a cable; 5. an electrical heating ring; 6. perforating; 7. a driver; 8. a box body; 9. a cooling mechanism; 10. a cooling channel; 11. a sewage guide pipeline; 12. a sewage storage tank; 13. a branch pipe; 14. a PLC controller; 15. heating the semi-ring; 16. stripping the blade; 17. a sewage draining slotted hole; 18. a drive motor; 19. a drive roller; 20. anti-skid convex strips; 21. a refrigerator; 22. a cold air duct; 23. a condenser tube; 24. an outer tube; 25. an inner tube; 26. mounting grooves; 27. a sub-cooling pipe; 28. and (4) discharging the tubes outside.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1-6, the present invention provides a technical solution: an environment-friendly heat treatment device for high-ductility and high-strength steel bars comprises steel bar heat treatment equipment, wherein the steel bar heat treatment equipment comprises an operation table 1, an electric heating furnace, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, the electric heating furnace is respectively provided with a plurality of groups and is uniformly arranged on the operation table 1, the electric heating furnace comprises a furnace body 2, a distribution box 3, a cable 4 and an electric heating ring 5, the distribution box 3 is arranged at the top of the furnace body 2 and is connected with the electric heating ring 5 through the cable 4, the electric heating ring 5 is arranged in the furnace body 2, a penetrating opening 6 is formed in the middle of the electric heating ring, the transverse driving mechanism comprises a plurality of groups of drivers 7, the drivers 7 are arranged between two adjacent groups of electric heating furnaces, the cooling box is arranged on the right side of the operation table 1 and comprises a box body 8 and a cooling mechanism 9 arranged on the box body 8, the cooling mechanism 9 is connected with a cooling channel 10 through a pipeline, the cooling channel 10 is penetrated in the box body 8 and is at the same horizontal height as the penetrating opening 6, the mechanism is handled in flue gas environmental protection is including leading dirty pipeline 11 and setting up in leading the terminal dirty case 12 of storing up of dirty pipeline 11, leads and evenly installs a plurality of groups branch pipe 13 on dirty pipeline 11, and the upper end of a plurality of groups branch pipe 13 is connected with the bottom of a plurality of groups furnace body 2, and one side of operation panel 1 is provided with PLC controller 14, and PLC controller 14 is connected with reinforcing bar thermal treatment equipment through the circuit.
Example 2: as shown in fig. 3: the electric heating ring 5 is composed of two groups of heating half rings 15, a plurality of groups of stripping blades 16 are uniformly arranged on the inner walls of the heating half rings 15, a plurality of groups of sewage discharge slotted holes 17 are uniformly formed in the surfaces of the heating half rings 15, the groups of sewage discharge slotted holes 17 are communicated with the bottom of the furnace body 2, the steel bars are heated by the heating half rings 15, metal fragments on the surfaces of the steel bars are stripped by the stripping blades 16, and the metal fragments are guided into the lower part through the sewage discharge slotted holes 17.
The stripping blade 16 is integrally of a bent structure, and the inner side of the stripping blade is of a blade structure, so that metal scraps attached to the surface of the steel bar can be conveniently cleaned.
Example 3: as shown in fig. 2: horizontal actuating mechanism includes driving motor 18 and installs in driving motor 18 power take off's drive roller 19, and the middle part machine-shaping of drive roller 19 has a plurality of sets of anti-skidding sand grip 20, and a plurality of sets of anti-skidding sand grip 20 are the screw thread form setting, and such design is convenient for carry out horizontal direction drive to the reinforcing bar and handles.
Example 4: as shown in fig. 6: the cooling mechanism 9 is composed of a refrigerator 21, cold air pipelines 22 and a condenser pipe 23, the refrigerator 21 is installed on the top of the box body 8 and is connected with the condenser pipe 23 through two groups of cold air pipelines 22, the condenser pipe 23 is arranged in the cooling channel 10, and cooling gas is guided into the condenser pipe 23 through the refrigerator 21 so as to cool the condenser pipe 23.
The cooling channel 10 is of a double-layer structure and comprises an outer pipe 24 and an inner pipe 25 which are mutually sleeved and embedded, a mounting groove 26 is formed between the outer pipe 24 and the inner pipe 25, the condenser pipe 23 is arranged in the mounting groove 26, a cooling medium is filled in the mounting groove 26, and the cooling channel 10 is convenient to be introduced for cooling treatment in the design mode.
Specifically, lead dirty pipeline 11 and the junction of storing up dirty case 12 and install outer calandria 28, outer calandria 28 is the trumpet-shaped structure and upper end diameter is less than the lower extreme diameter, and the lower extreme of outer calandria 28 is linked together with storing up dirty case 12, and the leading-in to storing up dirty case 12 of metal piece that leads outward is convenient for to such design mode.
When in use: the invention designs a device for heat treatment of special steel bars, which comprises an operating platform 1, electric heating furnaces, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, wherein the electric heating furnaces are divided into a plurality of groups and are uniformly arranged on the operating platform 1, the transverse driving mechanism is arranged between two adjacent groups of electric heating furnaces, the steel bars are inserted into the electric heating furnaces and are subjected to heat treatment through the electric heating furnaces, the steel bars after heat treatment are transversely displaced through the transverse driving mechanism and reach the inside of the cooling box, the cooling mechanism 9 in the cooling box is used for rapidly cooling the heated steel bars, the transverse driving mechanism at the tail part is used for blanking treatment, and when the steel bars are positioned in the electric heating furnaces for heating, metal attachments on the surfaces of the steel bars can be subjected to glass treatment through glass blades on the inner walls of the electric heating furnaces and are guided into the smoke environment-friendly treatment mechanism, the dirt is stored through the smoke environment-friendly treatment, so that the effect of the equipment on the heat treatment of the reinforcing steel bars is improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an environment-friendly heat treatment device of high ductility high strength steel bar, includes reinforcing bar heat treatment facility, its characterized in that: the steel bar heat treatment equipment comprises an operating platform (1), an electric heating furnace, a transverse driving mechanism, a cooling box and a smoke environment-friendly treatment mechanism, wherein the electric heating furnace is respectively provided with a plurality of groups and is uniformly arranged on the operating platform (1), the electric heating furnace consists of a furnace body (2), a distribution box (3), a cable (4) and an electric heating ring (5), the distribution box (3) is arranged at the top of the furnace body (2) and is connected with the electric heating ring (5) through the cable (4), the electric heating ring (5) is arranged in the furnace body (2) and is provided with a through hole (6) in the middle, the transverse driving mechanism consists of a plurality of groups of drivers (7), the drivers (7) are arranged between two adjacent groups of electric heating furnaces, the cooling box is arranged on the right side of the operating platform (1) and comprises a box body (8) and a cooling mechanism (9) arranged on the box body (8), cooling body (9) have cooling channel (10) through the pipe connection, cooling channel (10) alternate in box (8) and with wear mouthful (6) and be in same level, flue gas environmental protection processing mechanism is including leading dirty pipeline (11) and setting up in leading terminal storage dirty case (12) of dirty pipeline (11), evenly install a plurality of groups branch pipe (13), a plurality of groups on leading dirty pipeline (11) the upper end of branch pipe (13) is connected with the bottom of a plurality of groups furnace body (2), one side of operation panel (1) is provided with PLC controller (14), PLC controller (14) are connected with reinforcing bar thermal treatment equipment through the circuit.
2. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 1, wherein: the electric heating ring (5) is composed of two groups of heating semi-rings (15), a plurality of groups of stripping blades (16) are uniformly arranged on the inner walls of the heating semi-rings (15), a plurality of groups of sewage discharge slotted holes (17) are uniformly formed in the surfaces of the heating semi-rings (15), and the sewage discharge slotted holes (17) are communicated with the bottom of the furnace body (2).
3. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 2, wherein: the stripping blade (16) is of a bent structure as a whole and has a blade-shaped structure on the inner side.
4. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 1, wherein: horizontal actuating mechanism includes driving motor (18) and installs in driving motor (18) power take off's drive roller (19), the middle part machine-shaping of drive roller (19) has a plurality of groups anti-skidding sand grip (20), a plurality of groups anti-skidding sand grip (20) are the screw thread form setting.
5. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 1, wherein: cooling body (9) comprise refrigerator (21), air conditioning pipeline (22) and condenser pipe (23), refrigerator (21) are installed in the top of box (8) and are connected with condenser pipe (23) through two sets of air conditioning pipeline (22), place in cooling channel (10) in condenser pipe (23).
6. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 5, wherein: cooling channel (10) are bilayer structure and including outer tube (24) and inner tube (25) that inlay each other, be formed with mounting groove (26) between outer tube (24) and inner tube (25), place mounting groove (26) in condenser pipe (23), mounting groove (26) intussuseption is filled with coolant.
7. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 6, wherein: the condenser pipe (23) is composed of a plurality of groups of sub-cooling pipes (27), and the sub-cooling pipes (27) are uniformly arranged in the mounting groove (26) in an annular shape.
8. The environment-friendly heat treatment device for the high-ductility and high-strength steel bar according to claim 1, wherein: lead dirty pipeline (11) and store up the junction of dirty case (12) and install outer calandria (28), outer calandria (28) are the loudspeaker column structure and the upper end diameter is less than the lower extreme diameter, the lower extreme and the storage dirty case (12) of outer calandria (28) are linked together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111222959.6A CN114045386A (en) | 2021-10-20 | 2021-10-20 | Environment-friendly heat treatment device for high-ductility and high-strength steel bars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111222959.6A CN114045386A (en) | 2021-10-20 | 2021-10-20 | Environment-friendly heat treatment device for high-ductility and high-strength steel bars |
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2021
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