CN113857248A - Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation - Google Patents
Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation Download PDFInfo
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- CN113857248A CN113857248A CN202111233785.3A CN202111233785A CN113857248A CN 113857248 A CN113857248 A CN 113857248A CN 202111233785 A CN202111233785 A CN 202111233785A CN 113857248 A CN113857248 A CN 113857248A
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- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 17
- 239000002184 metal Substances 0.000 abstract description 17
- 238000013329 compounding Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010924 continuous production Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000010936 titanium Substances 0.000 abstract description 4
- 229910052719 titanium Inorganic materials 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000010301 surface-oxidation reaction Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 102100037573 Dual specificity protein phosphatase 12 Human genes 0.000 description 1
- 101000881110 Homo sapiens Dual specificity protein phosphatase 12 Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The equipment for controlling the warpage of the plate shape of the bimetal composite plate by utilizing hydraulic speed regulation comprises an upper working roll module, a lower working roll module, a speed regulation hydraulic system and a brake hydraulic system, and can realize large torsion, reversibility, low speed, asynchronism and differential transmission in the rolling process by carrying out stepless speed regulation on a hydraulic motor in the rolling process of the composite plate, thereby carrying out online real-time regulation and control on the plate shape of the bimetal composite plate, effectively solving the problems that the metal is large in curvature warpage and incapable of continuous production caused by inconsistent elongation rates of the upper metal and the lower metal, simultaneously promoting the formation of a rolling area at a combination interface, increasing the shearing deformation of a material contact surface, being beneficial to crushing a surface oxidation film, reducing the critical deformation force required by rolling and compounding, and producing the composite plate with high composite strength; in addition, superplastic rolling can be realized through the cooperative control of the rotating speed of the hydraulic motor, and the method is suitable for compounding titanium/steel, titanium/titanium-aluminum and other metals which are difficult to deform.
Description
Technical Field
The invention relates to the technical field of composite plate rolling forming, in particular to equipment for controlling the plate shape warpage of a bimetallic composite plate by utilizing hydraulic speed regulation.
Background
The bimetal composite board has a complementary effect while maintaining the characteristics of the base material, has excellent comprehensive performance through proper proportion combination, and is an important new material urgently needed in national economic construction. The rolling compounding method is to contact two different surface cleaning materials with each other, so that the metal generates plastic deformation under the action of strong pressure of a rolling mill, the metal layer on the bonding surface is promoted to break, and fresh metal is exposed from a crack and mutually embedded to realize metallurgical bonding. However, in actual production, the elongation of the upper metal and the lower metal are different, so that the metal is easy to warp with large curvature, and continuous production cannot be realized.
Disclosure of Invention
In order to solve the defects of the prior art, the equipment for controlling the plate shape warpage of the bimetal composite plate by utilizing hydraulic speed regulation is provided, so that the problems of large curvature warpage of metal and incapability of continuous production caused by inconsistent elongation rates of an upper metal and a lower metal can be solved.
The equipment for controlling the plate shape warpage of the bimetal composite plate by utilizing hydraulic speed regulation comprises an upper working roll module and a lower working roll module, wherein the upper working roll module and the lower working roll module respectively comprise working rolls, one ends of the working rolls are connected with a hydraulic motor through couplers, the other ends of the working rolls are provided with encoders, the bimetal composite plate is placed between the working rolls in the upper working roll module and the lower working roll module to realize the rolling of the bimetal composite plate, and a working cavity of the hydraulic motor is communicated with a hydraulic system to realize the control of the rotation speed and the rotation direction of the hydraulic motor.
As a further improvement of the above scheme, the hydraulic system includes a speed-adjusting hydraulic system and a braking hydraulic system to realize stepless speed change and flexible braking of the hydraulic motor.
As a further improvement of the above scheme, the speed-regulating hydraulic system includes a proportional pressure-reducing valve, a port B of the proportional pressure-reducing valve is communicated with a main pressure oil pipe P, a port a of the proportional pressure-reducing valve is communicated with a port B of a first hydraulic control one-way valve, a port a of the first hydraulic control one-way valve is communicated with a port P of a servo valve, a port a of the servo valve is communicated with a port a of a second hydraulic control one-way valve, a port B of the servo valve is communicated with a port a of a third hydraulic control one-way valve, a port T of the servo valve is communicated with a main oil return pipe T, a port B of the second hydraulic control one-way valve is communicated with a port a of a hydraulic motor, a port B of the third hydraulic control one-way valve is communicated with a port B of the hydraulic motor, ports X of the first hydraulic control one-way valve, the second hydraulic control one-way valve and the third hydraulic control one-way valve are all communicated with a port a of an electromagnetic ball valve, and the proportional pressure-reducing valve, the first one-way valve, the second valve and the third hydraulic valve are all communicated with a port B of the electromagnetic ball valve, And Y ports of the second hydraulic control one-way valve and the third hydraulic control one-way valve are communicated with an oil drainage pipe Y, a P port of the electromagnetic ball valve is communicated with a main pressure oil pipe P, and a T port of the electromagnetic ball valve is communicated with a main oil return pipe T.
As a further improvement of the above scheme, a check valve is arranged between the port T of the servo valve and the main oil return pipe T to prevent oil in the main oil return pipe T from flowing back into the servo valve.
As a further improvement of the scheme, the port B of the second hydraulic control one-way valve and the port A of the hydraulic motor are both connected with the port P of the overflow valve, and the port T of the overflow valve is communicated with the main oil return pipe T.
As a further improvement of the above scheme, the port B of the second hydraulic control check valve and the port a of the hydraulic motor are both connected to a pressure sensor to monitor the pressure condition of the working chamber in the hydraulic motor.
As a further improvement of the above scheme, the brake hydraulic system includes a brake, a brake mechanism of the brake is in contact with a rotating shaft of the hydraulic motor, flexible braking of the hydraulic motor is realized through friction between the brake mechanism and the rotating shaft, a working chamber of the brake is communicated with a port B of the speed regulating valve, a port a of the speed regulating valve is communicated with a port B of the check valve and a port a of the unloading valve, the port a of the check valve is communicated with a main pressure oil pipe P, and the port B of the unloading valve is communicated with a main oil return pipe T.
The invention has the beneficial effects that:
compared with the prior art, the equipment for controlling the plate shape warpage of the bimetal composite plate by utilizing hydraulic speed regulation has the following advantages:
1. in the rolling process of the composite plate, the large torsion, reversibility, low speed, asynchronism and differential transmission in the rolling process can be realized by carrying out stepless speed change adjustment on the rotating speed of the hydraulic motor, so that the shape of the bimetallic composite plate is regulated and controlled on line in real time, and the problems of large curvature and warping of the metal and incapability of continuous production caused by inconsistent elongation of the upper metal and the lower metal are effectively solved;
2. the superplastic rolling can be realized by the cooperative control of the rotating speed of the hydraulic motor, and the method is suitable for the compounding of titanium/steel, titanium/titanium-aluminum and other metals which are difficult to deform;
3. the rotation speed of the hydraulic motor is subjected to stepless speed change adjustment, so that a rolling area can be formed at a combination interface, the shearing deformation of a material contact surface is increased, a surface oxidation film is broken, the critical deformation force required by rolling compounding is reduced, and a composite plate with high composite strength is produced.
Drawings
FIG. 1 is a schematic diagram of the apparatus structure of the present invention;
fig. 2 is a connection diagram of the hydraulic system of the present invention.
Wherein: 1-proportional pressure reducing valve, 3-servo valve, 4-check valve, 5-electromagnetic ball valve, 6-overflow valve, 7-hydraulic motor, 8-pressure sensor, 9-working roller, 10-encoder, 11-one-way valve, 12-speed regulating valve, 13-brake, 14-unloading valve, 15-coupler, 16-bimetal composite plate, 21-first hydraulic control one-way valve, 22-second hydraulic control one-way valve, 23-third hydraulic control one-way valve, X-control oil pipe, P-main pressure oil pipe, T-main oil return pipe and Y-oil drain pipe.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
as shown in fig. 1-2, an apparatus for controlling a plate shape warpage of a bimetal composite plate by using hydraulic speed regulation includes an upper working roll module and a lower working roll module, both the upper working roll module and the lower working roll module include working rolls 9, one end of each working roll 9 is connected with a hydraulic motor 7 through a coupling 15, the other end of each working roll 9 is provided with an encoder 10, the bimetal composite plate 16 is placed between the working rolls 9 in the upper working roll module and the lower working roll module to roll the bimetal composite plate 16, and a working cavity of the hydraulic motor 7 is communicated with a hydraulic system to control a rotation speed and a rotation direction of the hydraulic motor 7; wherein: the hydraulic system comprises a speed-regulating hydraulic system and a braking hydraulic system so as to realize stepless speed change and flexible braking of the hydraulic motor 7; the speed regulation hydraulic system comprises a proportional pressure reducing valve 1, wherein a port B of the proportional pressure reducing valve 1 is communicated with a main pressure oil pipe P, a port A of the proportional pressure reducing valve 1 is communicated with a port B of a first hydraulic control one-way valve 21, a port A of the first hydraulic control one-way valve 21 is communicated with a port P of a servo valve 3, a port A of the servo valve 3 is communicated with a port A of a second hydraulic control one-way valve 22, a port B of the servo valve 3 is communicated with a port A of a third hydraulic control one-way valve 23, a port T of the servo valve 3 is communicated with a main oil return pipe T, a port B of the second hydraulic control one-way valve 22 is communicated with a port A of a hydraulic motor 7, a port B of the third hydraulic control one-way valve 23 is communicated with a port B of the hydraulic motor 7, ports X of the first hydraulic control one-way valve 21, the second hydraulic control one-way valve 22 and the third hydraulic control one-way valve 23 are communicated with a port A of an electromagnetic ball valve 5, the proportional pressure reducing valve 1, the first hydraulic control one-way valve 21, the second hydraulic control one-hydraulic valve 23 and the third hydraulic valve 23 are communicated with a port B of the electromagnetic ball valve 23, and the electromagnetic ball valve 3, and the electromagnetic ball valve are communicated with the electromagnetic ball valve, and the electromagnetic valve are communicated with the electromagnetic valve, and the electromagnetic valve are arranged in the electromagnetic valve, and the electromagnetic valve are arranged in the electromagnetic valve, and the electromagnetic valve are arranged in the electromagnetic valve, and the electromagnetic valve are arranged in the electromagnetic valve, and the electromagnetic valve are arranged in the electromagnetic valve, and the electromagnetic valve, and the electromagnetic valve, The Y ports of the first hydraulic control one-way valve 21, the second hydraulic control one-way valve 22 and the third hydraulic control one-way valve 23 are communicated with an oil drainage pipe Y, the P port of the electromagnetic ball valve 5 is communicated with a main pressure oil pipe P, and the T port of the electromagnetic ball valve 5 is communicated with a main oil return pipe T; a check valve 4 is arranged between a T port of the servo valve 3 and the main oil return pipe T to prevent oil in the main oil return pipe T from flowing back into the servo valve 3; the port B of the second hydraulic control one-way valve 22 and the port A of the hydraulic motor 7 are both connected with the port P of the overflow valve 6, and the port T of the overflow valve 6 is communicated with a main oil return pipe T; the port B of the second hydraulic control one-way valve 22 and the port A of the hydraulic motor 7 are both connected with a pressure sensor 8 so as to monitor the pressure condition of a working cavity in the hydraulic motor 7; the brake hydraulic system comprises a brake 13, a brake mechanism of the brake 13 is in contact with a rotating shaft of the hydraulic motor 7, flexible braking on the hydraulic motor 7 is achieved through friction between the brake mechanism and the rotating shaft, a working accommodating cavity of the brake 13 is communicated with a port B of a speed regulating valve 12, a port A of the speed regulating valve 12 is communicated with a port B of a one-way valve 11 and a port A of an unloading valve 14, the port A of the one-way valve 11 is communicated with a main pressure oil pipe P, and the port B of the unloading valve 14 is communicated with a main oil return pipe T.
The invention provides a device for controlling the plate shape warpage of a bimetal composite plate by utilizing hydraulic speed regulation, which comprises the following steps in the rolling process of the bimetal composite plate 16:
(1) rotation of the working rolls 9 in the upper and lower working roll modules
The proportional electromagnet YB2 in the servo valve 3 and the electromagnet YVH1 in the electromagnetic ball valve are simultaneously electrified, oil in the main pressure oil pipe P flows into a working cavity of the hydraulic motor 7 through a B-A channel of the proportional pressure reducing valve 1, a B-A channel of the first hydraulic control one-way valve 21, a P-B channel of the servo valve 3 and an A-B channel of the third hydraulic control one-way valve 23, and the hydraulic motor 7 drives the working roller 9 to rotate;
the forward rotation or the reverse rotation of the hydraulic motor 7 can be realized by adjusting the power-on sequence of proportional electromagnets YB1 and YB2 in the servo valve 3, so that the reversible rolling of the working roll 9 is realized.
(2) Stepless speed regulation of working rolls 9 in upper working roll module and lower working roll module
The working roller 9 is driven by the hydraulic motor 7 to rotate, and the hydraulic motor 7 is regulated by the servo valve 3 through a speed closed loop formed by an encoder 10; meanwhile, the pressure in the working cavity of the hydraulic motor 7 is timely adjusted on line by a pressure closed loop consisting of the pressure sensor 8 and the proportional pressure reducing valve 1; the stepless speed regulation of the working roll 9 is realized through the online cooperative control of the speed closed loop and the pressure closed loop, so that the online regulation and control of the shape of the bimetal composite plate 16 are realized.
The specific operation process is as follows: the rotating speed of the working roll 9 can independently adjust the oil entering the working cavity of the hydraulic motor 7 by controlling the power-on voltage of the proportional electromagnet YB2 in the servo valve 3, and meanwhile, the opening degree of a valve core in the servo valve 3 is in direct proportion to the power-on voltage of the proportional electromagnet YB2 in the servo valve 3; namely: the larger the voltage obtained by the proportional electromagnet YB2 is, the larger the opening degree of the valve core of the servo valve 3 is, the more oil flows into the working cavity of the hydraulic motor 7, and the faster the rotating speed of the working roller 9 is; the smaller the voltage of the proportional electromagnet YB2, the smaller the opening degree of the valve core of the servo valve 3, the less the oil liquid flows into the working cavity of the hydraulic motor 7, and the slower the rotating speed of the working roll 9.
(3) Flexible braking of the working rolls 9 in the upper and lower working roll modules
When the rolling process of the bimetal composite plate is finished, the working rolls 9 in the upper working roll module and the lower working roll module need to stop working, but the working rolls 9 cannot be quickly stopped due to inertia generated by the dead weight of the working rolls 9, so that the working rolls 9 need to be flexibly braked by a brake hydraulic system;
the specific operation process is as follows: the proportional electromagnet YB5 in the speed regulating valve 5 and the electromagnet YVH3 in the unloading valve 14 are electrified, and the oil in the working cavity of the brake 13 flows into the main oil return pipe T through the B-A channel of the speed regulating valve 12 and the A-B channel of the unloading valve 14;
the unloading speed is in direct proportion to the current obtained by the proportional electromagnet YB5 in the speed regulating valve 12.
(4) Safety protection of hydraulic motor 7
The hydraulic motor 7 is provided with a bypass safety protection, namely: the relief valve 6 serves as a relief valve for protecting the hydraulic motor 7, and when the driving force of the hydraulic motor 7 exceeds the set pressure of the relief valve 6, the relief valve is unloaded, thereby maintaining the stability of the hydraulic motor 7.
In summary, the following steps: the shape of the bimetal composite plate 16 in the rolling process is regulated and controlled on line through the cooperative cooperation of the speed-regulating hydraulic system and the braking hydraulic system. When the bimetal composite plate 16 is warped upwards, the rolling speed of the working roll 9 in the upper working roll module is higher than that of the working roll 9 in the lower working roll module; when the bimetal composite plate 16 warps downwards, the rolling speed of the working roller 9 in the upper working roller module is lower than that of the working roller 9 in the lower working roller module.
The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.
Claims (7)
1. The utility model provides an utilize equipment of hydraulic pressure speed governing control bimetal composite sheet plate shape warpage which characterized in that: including last work roll module and work roll module down, go up work roll module, work roll module down and all include work roll (9), the one end of work roll (9) is passed through shaft coupling (15) and is connected with hydraulic motor (7), the other end of work roll (9) is provided with encoder (10), bimetal composite sheet (16) have been placed between work roll (9) in going up work roll module, the work roll module down, the rolling to bimetal composite sheet (16) is realized, the work of hydraulic motor (7) holds chamber and hydraulic system intercommunication to the realization is to hydraulic motor (7) rotation speed and direction of rotation's control.
2. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 1, is characterized in that: the hydraulic system comprises a speed-regulating hydraulic system and a braking hydraulic system so as to realize stepless speed change and flexible braking of the hydraulic motor (7).
3. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 2, is characterized in that: the speed regulation hydraulic system comprises a proportional pressure reducing valve (1), wherein a port B of the proportional pressure reducing valve (1) is communicated with a main pressure oil pipe P, a port A of the proportional pressure reducing valve (1) is communicated with a port B of a first hydraulic control one-way valve (21), a port A of the first hydraulic control one-way valve (21) is communicated with a port P of a servo valve (3), a port A of the servo valve (3) is communicated with a port A of a second hydraulic control one-way valve (22), a port B of the servo valve (3) is communicated with a port A of a third hydraulic control one-way valve (23), a port T of the servo valve (3) is communicated with a main oil return pipe T, a port B of the second hydraulic control one-way valve (22) is communicated with a port A of a hydraulic motor (7), a port B of the third hydraulic control one-way valve (23) is communicated with a port B of the hydraulic motor (7), and all ports X of the first hydraulic control one-way valve (21), the second hydraulic control one-way valve (22) and the third hydraulic control one-way valve (23) are communicated with an electromagnetic ball valve (5), the Y ports of the proportional pressure reducing valve (1), the first hydraulic control one-way valve (21), the second hydraulic control one-way valve (22) and the third hydraulic control one-way valve (23) are communicated with an oil drainage pipe Y, a P port of the electromagnetic ball valve (5) is communicated with a main pressure oil pipe P, and a T port of the electromagnetic ball valve (5) is communicated with a main oil return pipe T.
4. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 3, is characterized in that: a check valve (4) is arranged between a T port of the servo valve (3) and the main oil return pipe T, so that oil in the main oil return pipe T is prevented from flowing back into the servo valve (3).
5. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 3, is characterized in that: and a port B of the second hydraulic control one-way valve (22) and a port A of the hydraulic motor (7) are both connected with a port P of the overflow valve (6), and a port T of the overflow valve (6) is communicated with a main oil return pipe T.
6. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 3, is characterized in that: and the port B of the second hydraulic control one-way valve (22) and the port A of the hydraulic motor (7) are connected with a pressure sensor (8) so as to monitor the pressure condition of a working cavity in the hydraulic motor (7).
7. The device for controlling the plate-shaped warpage of the bimetal composite plate by utilizing the hydraulic speed regulation as claimed in claim 2, is characterized in that: the brake hydraulic system is including stopper (13), the brake mechanism of stopper (13) and the rotation axis contact of hydraulic motor (7), through the friction realization between brake mechanism and the rotation axis to the flexible braking of hydraulic motor (7), the work of stopper (13) holds the chamber and the B mouth intercommunication of governing valve (12), the A mouth of governing valve (12) and the B mouth of check valve (11), the A mouth of off-load valve (14) intercommunication, the A mouth and the main pressure oil pipe P intercommunication of check valve (11), the B mouth and the main oil return pipe T intercommunication of off-load valve (14). .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233785.3A CN113857248A (en) | 2021-10-22 | 2021-10-22 | Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233785.3A CN113857248A (en) | 2021-10-22 | 2021-10-22 | Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation |
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| CN113857248A true CN113857248A (en) | 2021-12-31 |
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| CN202111233785.3A Pending CN113857248A (en) | 2021-10-22 | 2021-10-22 | Equipment for controlling warping of bimetal composite board plate shape by utilizing hydraulic speed regulation |
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