CN109622775A - A kind of cooling cycle panel beating equipment - Google Patents

A kind of cooling cycle panel beating equipment Download PDF

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Publication number
CN109622775A
CN109622775A CN201811545825.6A CN201811545825A CN109622775A CN 109622775 A CN109622775 A CN 109622775A CN 201811545825 A CN201811545825 A CN 201811545825A CN 109622775 A CN109622775 A CN 109622775A
Authority
CN
China
Prior art keywords
panel beating
support column
pipe
cooling cycle
beating equipment
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
CN201811545825.6A
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Chinese (zh)
Inventor
杨朝蓬
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.)
Luoyang Guanchi Precision Engineering Technology Co Ltd
Original Assignee
Luoyang Guanchi Precision Engineering Technology 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 Luoyang Guanchi Precision Engineering Technology Co Ltd filed Critical Luoyang Guanchi Precision Engineering Technology Co Ltd
Priority to CN201811545825.6A priority Critical patent/CN109622775A/en
Publication of CN109622775A publication Critical patent/CN109622775A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/16Heating or cooling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

The invention discloses a kind of cooling cycle panel beating equipment, including panel beating apparatus body, the bottom of the panel beating apparatus body is provided with reservoir chamber, reinforcing soleplate is provided at the top of the reservoir chamber, the reinforcing soleplate top side is provided with the second support column, the side of second support column is provided with motor placement plate, driving motor is installed at the top of the motor placement plate, the side of the driving motor is equipped with machine shaft, the side of the machine shaft is equipped with flabellum, the side of second support column is provided with cooling chamber, U-shaped condenser pipe is provided in the cooling chamber, the first condensation branch pipe is reserved at the top of the U-shaped condenser pipe, the bottom of the U-shaped condenser pipe is reserved with the second condensation branch pipe, there are ventholes for side of the cooling chamber far from flabellum.The utility model has the advantages that the present invention solves the disadvantage that equipment high temperature can not cool down in time when existing panel beating, it is ensured that the precision of processing improves work efficiency.

Description

A kind of cooling cycle panel beating equipment
Technical field
The present invention relates to sheet metal technical field of processing equipment, it particularly relates to a kind of cooling cycle panel beating equipment.
Background technique
Metal plate is a kind of processing technology, and metal plate is up to now there has been no one than more completely definition.According to foreign countries, certain is special First definition on industry periodical, can be defined as: metal plate is (usually cold in a kind of synthesis of 6mm or less) for sheet metal Processing technology, including cut, rush/cut/compound, folding, riveting, splicing, molding (such as body of a motor car).Its significant feature is exactly same One part thickness is consistent.Metal plate is with light-weight, intensity is high, conductive (can be used in being electromagnetically shielded), at low cost, scale of mass production The features such as performance is good is widely applied in fields such as electronic apparatus, communication, auto industry, medical instruments, such as in computer Cabinet, mobile phone, in MP3, metal plate is essential component part.As metal plate is using more and more extensive, sheet metal component set Meter becomes a ring critically important in product development process, and mechanical engineer must skillfully grasp the design tactics of sheet metal component, make The metal plate that must be designed not only had met the requirement such as function and appearance of product, but also stamping die can be made to be simple to manufacture, is at low cost.Existing Have in technology and need to stop working since equipment generates high temperature during generally existing panel beating, after construction equipment to be added is cooling It just works on, is greatly lowered working efficiency in this way, while accuracy reduces when high temperature will cause punching press metal plate, to production Bring many inconvenience, and it is existing in have the panel beating equipment of cooling equipment, coolant liquid cannot recycle cause it is unnecessary Waste, does not have good popularizing action.For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For the problems in the relevant technologies, the present invention proposes a kind of cooling cycle panel beating equipment, to overcome existing phase Above-mentioned technical problem present in the technology of pass.
The technical scheme of the present invention is realized as follows:
A kind of cooling cycle panel beating equipment, including panel beating apparatus body, the bottom of the panel beating apparatus body It is provided with reservoir chamber, reinforcing soleplate is provided at the top of the reservoir chamber, the reinforcing soleplate top side is provided with first Dagger, the reinforcing soleplate top other side are provided with the second support column, the top of first support column and the second support column It is provided with first crossbeam, second cross beam is provided at the top of the first crossbeam, it is tight between the first crossbeam and second cross beam Close pressing, the side of second support column are provided with motor placement plate, and the motor placement plate is fixed on second support On column, driving motor is installed, the side of the driving motor is equipped with machine shaft, described at the top of the motor placement plate Machine shaft extends through second support column, and the intersection of the machine shaft and second support column is provided with axis It holding, the bearing closely surrounds on the machine shaft, and the machine shaft energy non-resistance rotates, and the one of the machine shaft Side is equipped with flabellum, the flabellum be it is multiple, the side of second support column is provided with cooling chamber, and the flabellum is passed through described In cooling chamber, it is provided with U-shaped condenser pipe in the cooling chamber, the U-shaped condenser pipe is multiple, and the adjacent U-shaped condenser pipe It is contrary, and be welded as a whole in interface, the first condensation branch pipe is reserved at the top of the U-shaped condenser pipe, the U-shaped is cold The bottom of solidifying pipe is reserved with the second condensation branch pipe, and the first condensation branch pipe and the second condensation branch pipe and the U-shaped condense Seamless welding at interface tube, there are venthole, the venthole is multiple for side of the cooling chamber far from flabellum.
Further, the side outside the reservoir chamber is welded with outlet pipe, the outlet pipe close to the reservoir chamber one Side is provided with valve, is reserved with tap water in the reservoir chamber.
Further, water pump is installed at the top of the outlet pipe, is provided with water inlet pipe at the top of the water pump, it is described go out Water pipe and the water inlet pipe and the water pump interface seamless welding.
Further, condenser, side of the water inlet pipe far from the water pump are installed at the top of the second cross beam It is passed through in the condenser, and the interface seamless welding with the condenser.
Further, the side bottom outside the condenser is welded with condenser pipe, and the condenser pipe is passed through the cooling chamber It is interior, and be integrated with the first condensation branch pipe welding.
Further, the side on the second cross beam is equipped with the first tightening nut, another on the second cross beam Side is equipped with the second tightening nut.
Further, first tightening nut and the second tightening nut, which fix the first crossbeam and second cross beam, presses It closes on first support column and the second support column.
Further, the bottom of the first crossbeam is welded with hydraulic cylinder, the bottom of the hydraulic cylinder close to middle position Portion is equipped with compression column, and the bottom of the compression column is welded with compression leg head.
Further, middle is provided with spill workbench on the reinforcing soleplate, is set on the spill workbench It is equipped with groove, there are metal plates to be processed at the top of the spill workbench.
Further, it is provided with heat sink strip outside the driving motor, the heat sink strip is made from a material that be thermally conductive, the heat dissipation Item is multiple.
Further, the bottom of the reservoir chamber is provided with bottom plate, the bottom plate, reinforcing soleplate, the first support column, second Support column, first crossbeam and second cross beam are made of metal material.
Beneficial effects of the present invention: (1) by setting cooling chamber and driving motor, tap water after cooling is generated cold Air-blowing can in time cool down to panel beating equipment to U-shaped workbench, effectively ensure that the accuracy of panel beating, and Greatly increase working efficiency;It (2), can be by tap water circulating cooling benefit by reservoir chamber, outlet pipe and the water inlet pipe of setting With saving water resource;(3) by setting the first tightening nut and the second tightening nut, the detachable present apparatus, in favor of Replacement and inspection present apparatus component.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 is a kind of overall structure figure of cooling cycle panel beating equipment of the present invention;
Fig. 2 is enlarged drawing at A in Fig. 1;
Fig. 3 is the structural schematic diagram of cooling chamber;
Fig. 4 is the main view of driving motor;
Fig. 5 is the enlarged drawing of spill workbench and compression column.
In figure:
1, panel beating apparatus body;2, first crossbeam;3, reinforcing soleplate;4, reservoir chamber;5, tap water;6, valve;7, it is discharged Pipe;8, water pump;9, the first support column;10, second cross beam;11, water inlet pipe;12, the first tightening nut;13, condenser;14, Two tightening nuts;15, the second support column;16, driving motor;17, motor placement plate;18, cooling chamber;19, bearing;20, first Condense branch pipe;21, U-shaped condenser pipe;22, the second condensation branch pipe;23, condenser pipe;24, venthole;25, heat sink strip;26, motor turns Axis;27, flabellum;28, compression leg head;29, spill workbench;30, hydraulic cylinder;31, column is compressed;32, metal plate to be processed;33, groove; 34, bottom plate.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected Range.
In the following, making further description to the present invention in conjunction with attached drawing and specific embodiment:
Please refer to Fig. 1-5, a kind of cooling cycle panel beating equipment according to an embodiment of the present invention, including panel beating equipment sheet Body 1, the bottom of the panel beating apparatus body 1 are provided with reservoir chamber 4, and the top of the reservoir chamber 4 is provided with reinforcing soleplate 3,3 top side of reinforcing soleplate is provided with the first support column 9, and the 3 top other side of reinforcing soleplate is provided with second The top of dagger 15, first support column 9 and the second support column 15 is provided with first crossbeam 2, the top of the first crossbeam 2 It is provided with second cross beam 10, is closely pressed between the first crossbeam 2 and second cross beam 10, the side of second support column 15 It is provided with motor placement plate 17, the motor placement plate 17 is fixed on second support column 15, the motor placement plate 17 Top driving motor 16 is installed, the side of the driving motor 16 is equipped with machine shaft 26, and the machine shaft 26 passes through The intersection of excessively described second support column 15 of break-through, the machine shaft 26 and second support column 15 is provided with bearing 19, The bearing 19 closely surrounds on the machine shaft 26, and 26 energy non-resistance rotation of the machine shaft, the machine shaft 26 side is equipped with flabellum 27, the flabellum 27 be it is multiple, the side of second support column 15 is provided with cooling chamber 18, institute It states flabellum 27 to be passed through in the cooling chamber 18, U-shaped condenser pipe 21 is provided in the cooling chamber 18, the U-shaped condenser pipe 21 is It is multiple, and the adjacent U-shaped condenser pipe 21 is contrary, and is welded as a whole in interface, the top of the U-shaped condenser pipe 21 It is reserved with the first condensation branch pipe 20, the bottom of the U-shaped condenser pipe 21 is reserved with the second condensation branch pipe 22, the first condensation branch Pipe 20 and the second condensation branch pipe 22 and 21 interface seamless welding of U-shaped condenser pipe, the cooling chamber 18 is far from flabellum There are venthole 24, the venthole 24 is multiple for 27 side.
Above scheme through the invention is welded with outlet pipe 7, the outlet pipe 7 by the side outside the reservoir chamber 4 Side close to the reservoir chamber 4 is provided with valve 6, tap water 5 is reserved in the reservoir chamber 7, valve 6 is for controlling water Outflow;The top of the outlet pipe 7 is equipped with water pump 8, and the top of the water pump 8 is provided with water inlet pipe 11,7 He of outlet pipe The water inlet pipe 11 and the 8 interface seamless welding of water pump, anti-locking apparatus infiltration;The top of the second cross beam 10 is equipped with Condenser 13, the water inlet pipe 11 are passed through in the condenser 13 far from the side of the water pump 8, and with the condenser 13 Interface seamless welding increases the tightness of device, prevents leak.
It is welded with condenser pipe 23 by the side bottom outside the condenser 13, the condenser pipe 23 is passed through the cooling chamber It in 18, and is welded as a whole with the first condensation branch pipe 20, the side on the second cross beam 10 is equipped with first and tightens spiral shell Mother 12, the other side on the second cross beam 10 are equipped with the second tightening nut 14, and first tightening nut 12 and second is turned round The first crossbeam 2 and the fixation of second cross beam 10 are pressed together on first support column 9 and the second support column 15 by tight nut 14, The detachable present apparatus, in favor of replacing and checking present apparatus component.
Hydraulic cylinder 30, the bottom of the hydraulic cylinder 30 are welded with close to middle position by the bottom of the first crossbeam 2 Portion is equipped with compression column 31, and the bottom of the compression column 31 is welded with compression leg head 28, is used for punching press metal plate 32 to be processed;It is described to add Gu being provided with spill workbench 29 close to middle on bottom plate 3, fluted 33 are arranged on the spill workbench 29, the spill The top of workbench 29 is provided with heat sink strip 25 there are metal plate 32 to be processed outside the driving motor 16, the heat sink strip 25 by Heat Conduction Material is made, the heat sink strip 25 be it is multiple, be conducive to the rapid cooling of driving motor 16, extend the longevity of driving motor 16 Life;The bottom of the reservoir chamber 4 is provided with bottom plate 34, the bottom plate 34, reinforcing soleplate 3, the first support column 9, the second support column 15, first crossbeam 2 and second cross beam 10 are made of metal material, and improve the stability of device, while increasing the damage tolerant of device Degree.
In a particular application, when work, start hydraulic cylinder 30, get off on the compression column 31 and compression leg head 28 on hydraulic cylinder 30 It backwashing pressure, metal plate 32 to be processed is placed on spill workbench 29, compression leg head 28 carries out punch process to metal plate 32 to be processed, this Shi Xuankai valve 6 starts water pump 8, and the tap water 5 in reservoir chamber 4 is extracted out and enters water inlet pipe 11 from outlet pipe 7 by water pump 8, It enters eventually into condenser 13, condenser 13 cools down tap water 5, and tap water 5 after cooling enters from condenser pipe 23 Into the first condensation branch pipe 20 and U-shaped condenser pipe 21, at the same time, start driving motor 16, the machine shaft of driving motor 16 26 rotations, so that flabellum 27 be driven to rotate, the gas that flabellum 27 is fanned out to is by the cold air in U-shaped condenser pipe 21 from venthole to spill Workbench 29 is blown out, and is cooled down in time to it, and the cold water in U-shaped condenser pipe 21 condenses branch pipe 22 from bottom second and is flowed into storage In water chamber 4, a cooling recirculation system is formed.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to limit the present invention, Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features. All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention Within protection scope.

Claims (10)

1. a kind of cooling cycle panel beating equipment, which is characterized in that including panel beating apparatus body (1), the metal plate adds The bottom of construction equipment ontology (1) is provided with reservoir chamber (4), is provided with reinforcing soleplate (3) at the top of the reservoir chamber (4), described Reinforcing soleplate (3) top side is provided with the first support column (9), and the other side is provided with second at the top of the reinforcing soleplate (3) Dagger (15) is provided with first crossbeam (2) at the top of first support column (9) and the second support column (15), and described first is horizontal It is provided at the top of beam (2) second cross beam (10), is closely pressed between the first crossbeam (2) and second cross beam (10), it is described The side of second support column (15) is provided with motor placement plate (17), and the motor placement plate (17) is fixed on second support It on column (15), is equipped with driving motor (16) at the top of the motor placement plate (17), the side peace of the driving motor (16) Equipped with machine shaft (26), the machine shaft (26) extends through second support column (15), the machine shaft (26) It is provided with bearing (19) with the intersection of second support column (15), the bearing (19) closely surrounds the machine shaft (26) on, and the machine shaft (26) energy non-resistance rotation, the side of the machine shaft (26) is equipped with flabellum (27), institute State flabellum (27) be it is multiple, the side of second support column (15) is provided with cooling chamber (18), and the flabellum (27) is passed through institute It states in cooling chamber (18), is provided with U-shaped condenser pipe (21) in the cooling chamber (18), the U-shaped condenser pipe (21) is multiple, and The adjacent U-shaped condenser pipe (21) is contrary, and is welded as a whole in interface, and the top of the U-shaped condenser pipe (21) is pre- There are the first condensation branch pipe (20), the bottom of the U-shaped condenser pipe (21) is reserved with the second condensation branch pipe (22), and described first is cold Solidifying branch pipe (20) and second condensation branch pipe (22) and U-shaped condenser pipe (21) the interface seamless welding, the cooling chamber (18) for the side far from flabellum (27) there are venthole (24), the venthole (24) is multiple.
2. a kind of cooling cycle panel beating equipment according to claim 1, which is characterized in that the reservoir chamber (4) is outside Side be welded with outlet pipe (7), the outlet pipe (7) is provided with valve (6) close to the side of the reservoir chamber (4), described Tap water (5) are reserved in reservoir chamber (7).
3. a kind of cooling cycle panel beating equipment according to claim 2, which is characterized in that the outlet pipe (7) Top is equipped with water pump (8), is provided with water inlet pipe (11) at the top of the water pump (8), the outlet pipe (7) and the water inlet pipe (11) with the water pump (8) interface seamless welding.
4. according to claim 1 with a kind of cooling cycle panel beating equipment described in 3, which is characterized in that the second cross beam (10) it is equipped at the top of condenser (13), the water inlet pipe (11) is passed through the condenser far from the side of the water pump (8) (13) in, and the interface seamless welding with the condenser (13).
5. a kind of cooling cycle panel beating equipment according to claim 4, which is characterized in that the condenser (13) is outside A side bottom be welded with condenser pipe (23), the condenser pipe (23) is passed through in the cooling chamber (18), and with it is described first cold Solidifying branch pipe (20) are welded as a whole.
6. a kind of cooling cycle panel beating equipment according to claim 1, which is characterized in that the second cross beam (10) On side be equipped with the first tightening nut (12), the other side on the second cross beam (10) is equipped with the second tightening nut (14).
7. a kind of cooling cycle panel beating equipment according to claim 6, which is characterized in that first tightening nut (12) first crossbeam (2) and second cross beam (10) are fixed and are pressed together on first support column with the second tightening nut (14) (9) and on the second support column (15).
8. a kind of cooling cycle panel beating equipment according to claim 1, which is characterized in that the first crossbeam (2) Bottom be welded with hydraulic cylinder (30) close to middle position, the bottom of the hydraulic cylinder (30) be equipped with compression column (31), institute The bottom for stating compression column (31) is welded with compression leg head (28).
9. a kind of cooling cycle panel beating equipment according to claim 1, which is characterized in that the reinforcing soleplate (3) It is upper to be provided with spill workbench (29) close to middle, fluted (33), the spill are set on the spill workbench (29) There are metal plate to be processed (32) at the top of workbench (29).
10. a kind of cooling cycle panel beating equipment according to claim 1, which is characterized in that the driving motor (16) it is provided with heat sink strip (25) outside, the heat sink strip (25) is made from a material that be thermally conductive, and the heat sink strip (25) is multiple;It is described The bottom of reservoir chamber (4) is provided with bottom plate (34), the bottom plate (34), reinforcing soleplate (3), the first support column (9), the second support Column (15), first crossbeam (2) and second cross beam (10) are made of metal material.
CN201811545825.6A 2018-12-18 2018-12-18 A kind of cooling cycle panel beating equipment Pending CN109622775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811545825.6A CN109622775A (en) 2018-12-18 2018-12-18 A kind of cooling cycle panel beating equipment

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Application Number Priority Date Filing Date Title
CN201811545825.6A CN109622775A (en) 2018-12-18 2018-12-18 A kind of cooling cycle panel beating equipment

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110560573A (en) * 2019-10-11 2019-12-13 顾丽娟 sheet metal stamping device with good heat dissipation effect
CN111112480A (en) * 2019-12-19 2020-05-08 晋江荣达机械有限公司 Environment-friendly sheet metal machining equipment based on cooling circulation
CN112229136A (en) * 2020-10-22 2021-01-15 仪征常众汽车部件有限公司 Gas-liquid two-phase cooling system for punching machine assembly
CN112371852A (en) * 2020-10-26 2021-02-19 湖州恒大液压设备有限公司 Punch circulating internal cooling device of quick forging servo hydraulic machine
CN113059046A (en) * 2021-03-18 2021-07-02 杭州源航工业设计有限公司 Machining device for quick die-reversing mechanical parts and using method thereof

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Publication number Priority date Publication date Assignee Title
JPH07314541A (en) * 1994-05-26 1995-12-05 Sumitomo Chem Co Ltd Production of hollow molding applied with skin material
CN105201615A (en) * 2015-10-21 2015-12-30 无锡惠山泵业有限公司 Novel engine heat dissipation device
CN107606980A (en) * 2017-10-26 2018-01-19 梁溪区昊星工业设计工作室 A kind of heat-pipe radiator for thermoelectric refrigerator
CN108407381A (en) * 2018-04-25 2018-08-17 苏州鸣人金属制品有限公司 A kind of mould punching equipment
CN207992900U (en) * 2018-03-16 2018-10-19 青岛金中联科技发展有限公司 A kind of computer of good heat dissipation effect
CN208099003U (en) * 2018-02-12 2018-11-16 广州市和鑫智能装备科技有限公司 A kind of metal plate apparatus for bending of the accurate sheet metal component of manufacturing automation equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07314541A (en) * 1994-05-26 1995-12-05 Sumitomo Chem Co Ltd Production of hollow molding applied with skin material
CN105201615A (en) * 2015-10-21 2015-12-30 无锡惠山泵业有限公司 Novel engine heat dissipation device
CN107606980A (en) * 2017-10-26 2018-01-19 梁溪区昊星工业设计工作室 A kind of heat-pipe radiator for thermoelectric refrigerator
CN208099003U (en) * 2018-02-12 2018-11-16 广州市和鑫智能装备科技有限公司 A kind of metal plate apparatus for bending of the accurate sheet metal component of manufacturing automation equipment
CN207992900U (en) * 2018-03-16 2018-10-19 青岛金中联科技发展有限公司 A kind of computer of good heat dissipation effect
CN108407381A (en) * 2018-04-25 2018-08-17 苏州鸣人金属制品有限公司 A kind of mould punching equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110560573A (en) * 2019-10-11 2019-12-13 顾丽娟 sheet metal stamping device with good heat dissipation effect
CN111112480A (en) * 2019-12-19 2020-05-08 晋江荣达机械有限公司 Environment-friendly sheet metal machining equipment based on cooling circulation
CN112229136A (en) * 2020-10-22 2021-01-15 仪征常众汽车部件有限公司 Gas-liquid two-phase cooling system for punching machine assembly
CN112371852A (en) * 2020-10-26 2021-02-19 湖州恒大液压设备有限公司 Punch circulating internal cooling device of quick forging servo hydraulic machine
CN113059046A (en) * 2021-03-18 2021-07-02 杭州源航工业设计有限公司 Machining device for quick die-reversing mechanical parts and using method thereof

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Application publication date: 20190416