CN212003782U - Hydraulic control system for lifting device of feeding trolley - Google Patents
Hydraulic control system for lifting device of feeding trolley Download PDFInfo
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- CN212003782U CN212003782U CN202020087743.8U CN202020087743U CN212003782U CN 212003782 U CN212003782 U CN 212003782U CN 202020087743 U CN202020087743 U CN 202020087743U CN 212003782 U CN212003782 U CN 212003782U
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Abstract
The invention provides a hydraulic control system of a lifting device of a feeding trolley, which comprises hydraulic cylinders, wherein each hydraulic cylinder is provided with a hydraulic control pipeline, and each hydraulic control pipeline comprises a first control assembly, a second control assembly and a third control assembly; the first control assembly comprises a plate type throttling stop valve and an energy accumulator, and the plate type throttling stop valve and the energy accumulator are matched to stably control the flow and pressure balance of oil in the hydraulic pipeline; the second control component comprises a superposition type hydraulic control one-way valve, the third control component comprises a pilot sequence valve, and the superposition type hydraulic control one-way valve is matched with the pilot sequence valve to prevent the lifting device from automatically slipping down. According to the invention, a loop is formed between the oil tank and the hydraulic cylinder, and a plurality of control valves are arranged in the loop, so that the lifting device of the feeding trolley has more excellent functions and more stable output, and further the production efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of hydraulic control, and particularly relates to a hydraulic control system for a lifting device of a feeding trolley.
Background
In the rolling process of the hot rolled section steel, the lifting device of the feeding trolley is an indispensable auxiliary device. The feeding trolley lifting device is positioned at the inlet of the cooling bed area, the section steel is controlled to enter the cooling bed area, the synchronism and the performance of the feeding trolley lifting device influence the conveying and cooling effects of the section steel, the rolling success rate and the rolling efficiency are restricted, if the feeding trolley lifting device acts on deviation, the bending phenomenon of the hot section steel is directly caused, the rolling task is seriously influenced, and even the scrapped products are directly generated.
Disclosure of Invention
In view of this, the invention aims to provide a hydraulic control system for a lifting device of a feeding trolley, so as to solve the problem that hot section steel is bent, reduce the frequency of steel scrap accidents and reduce economic loss.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a hydraulic control system of a lifting device of a feeding trolley comprises a hydraulic cylinder, wherein the hydraulic cylinder comprises a hydraulic control pipeline, and the hydraulic control pipeline comprises a first control assembly, a second control assembly and a third control assembly;
the second control assembly comprises an electromagnetic directional valve, the electromagnetic directional valve comprises four ports, a port P1 is communicated with a main oil supply pipeline through a pipeline, the other end of the main oil supply pipeline is communicated with an oil tank, a port T1 is communicated with a main oil return pipeline through a pipeline, the other end of the main oil return pipeline is communicated with the oil tank, a port B is communicated with a rodless cavity of the hydraulic cylinder through a first pipeline A, the port A is communicated with a rod cavity of the hydraulic cylinder through a second pipeline, and the electromagnetic directional valve is used for controlling the proportion of oil output and oil return;
the first control component comprises a plate type throttling stop valve and an energy accumulator, the plate type throttling stop valve is matched with the energy accumulator to supplement oil quantity in an oil supply pipeline and maintain pressure balance in a hydraulic system, and the third control component comprises a pilot sequence valve which is used for solving the problem that the lifting device automatically slips down.
Further, the first control assembly includes: the first high-pressure ball valve, the second high-pressure ball valve, the first pressure measuring joint, the second pressure measuring joint and the one-way valve are located on the main oil return pipeline, and the ports A of the first high-pressure ball valve, the second pressure measuring joint, the one-way valve and the electromagnetic reversing valve are located on the main oil supply pipeline.
Further, an outlet of the second high-pressure ball valve is connected with a port T of the oil tank, an inlet of the second high-pressure ball valve is connected with a port T1 of an electromagnetic directional valve of the second control assembly, the first pressure measuring joint is located on a pipeline between the second high-pressure ball valve and the directional valve, an outlet of the first high-pressure ball valve is connected with an inlet of the one-way valve, and an outlet of the one-way valve is connected with a port P1 of the electromagnetic directional valve.
Further, the second control assembly still includes two check throttle valves of stack formula, stack formula liquid accuse check valve, two check throttle valves of stack formula include two check throttle valve A chambeies of stack formula, two check throttle valve B chambeies of stack formula, stack formula liquid accuse check valve includes stack formula liquid accuse check valve A chamber, stack formula liquid accuse check valve B chamber, the port B of solenoid directional valve, two check throttle valve B chambers of stack formula, stack formula liquid accuse check valve B chamber are located first pipeline, port A of solenoid directional valve, two check throttle valve A chambers of stack formula, stack formula liquid accuse check valve A chamber are located the second pipeline.
Furthermore, the outlet of the superposed double one-way throttle valve A cavity is connected with a port A of the electromagnetic directional valve, the inlet of the superposed double one-way throttle valve A cavity is connected with the outlet of the superposed hydraulic control one-way valve A cavity, the inlet of the superposed double one-way throttle valve B cavity is connected with a port B of the electromagnetic directional valve, and the outlet of the superposed double one-way throttle valve B cavity is connected with the inlet of the superposed hydraulic control one-way valve B cavity.
Furthermore, the third control component further comprises a third pressure measuring joint, a fourth pressure measuring joint, a third high-pressure ball valve and a fourth high-pressure ball valve, wherein the pilot sequence valve, the third pressure measuring joint and the fourth high-pressure ball valve are located on the first pipeline, and the fourth pressure measuring joint and the third high-pressure ball valve are located on the second pipeline.
Further, an inlet of the pilot sequence valve is connected with an outlet of a cavity B of the superposition type hydraulic control one-way valve of the second control assembly, an outlet of the pilot sequence valve is connected with an inlet of a fourth high-pressure ball valve, the third pressure measuring joint is connected on a pipeline between the pilot sequence valve and the fourth high-pressure ball valve, an outlet of the fourth high-pressure ball valve is connected with a rodless cavity of the hydraulic cylinder, an outlet of the third high-pressure ball valve is connected with an inlet of a cavity A of the superposition type hydraulic control one-way valve, the fourth pressure measuring joint is connected on a pipeline between the third high-pressure ball valve and the hydraulic control one-way valve, and an inlet of the third high-pressure ball valve is connected with a rod cavity of the hydraulic cylinder.
Further, first control assembly still includes board-like high-pressure ball valve, board-like throttle stop valve, board-like high-pressure ball valve, energy storage are located the pipeline between check valve and the solenoid directional valve, plate-like throttle stop valve is connected to the energy storage, board-like high-pressure ball valve is connected to board-like throttle stop valve, the one end that board-like high-pressure ball valve is connected board-like throttle stop valve is connected on the pipeline between check valve and the solenoid directional valve, and the other end is connected on the pipeline between second high-pressure ball valve and the switching-over valve.
Compared with the prior art, the hydraulic control system for the lifting device of the feeding trolley has the following advantages:
(1) the hydraulic cylinder forms a loop through a hydraulic control pipeline, and the loop is characterized in that dual back pressure control can be realized on the lifting device of the feeding trolley, the reliability is high, and the lifting device of the feeding trolley has more excellent functions and more stable output by matching an electromagnetic valve, a hydraulic control one-way valve, a pilot sequence valve and the like in the loop, so that the frequency of steel scrap accidents is greatly reduced, and the economic loss is reduced.
(2) The pilot-operated sequence valve overcomes the dead weight of a lifting device of a feeding trolley, prevents the device from suddenly dropping to cause overlarge pipeline pressure and pipe explosion, the superposed hydraulic control one-way valve realizes secondary back pressure protection through self locking, the superposed double one-way throttle valve realizes speed control, the energy accumulator prevents the hydraulic oil in the pipeline from being insufficient in a short time, the pressure of an instantaneous oil supplementing stable system is realized, the pressure measuring joint realizes the detection of the pressure of a hydraulic loop, the fault inquiry is facilitated, the plate-type high-pressure ball valve and the plate-type throttling stop valve control the oil to enter and exit the energy accumulator, and the superposed hydraulic control one-way valve prevents the influence of external unstable factors.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a connection structure diagram of a hydraulic control system of a lifting device of a feeding trolley according to an embodiment of the invention;
description of reference numerals:
a-a rodless cavity of a hydraulic cylinder; b-a rod cavity of the hydraulic cylinder; a1 — first line; b1 — second line; c-main return line; d-a main oil supply line; 1-a first control assembly; 11-a first high pressure ball valve; 12-a second high pressure ball valve; 13-a first pressure tap; 14-a second pressure tap; 15-plate type throttle stop valve; 16-plate high pressure ball valves; 17-an accumulator; 18-a one-way valve; 2-a second control assembly; 20-an electromagnetic directional valve; 201-port a; 202-port B; 21-a superimposed double one-way throttle valve; 210-a cavity of a superposition type double one-way throttle valve A; 211-a superposed double one-way throttle valve cavity B; 22-a superimposed hydraulic control one-way valve; 220 superposed hydraulic control one-way valve A cavity-; 221-superposition type hydraulic control one-way valve cavity B; 3-a third control assembly; 31-a piloted sequence valve; 32-a third pressure tap; 33-a fourth pressure tap; 34-a third high pressure ball valve; 35-a fourth high-pressure ball valve 4-a hydraulic cylinder; and 5, an oil tank.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in fig. 1, a hydraulic control system of a lifting device of a feeding trolley comprises a hydraulic cylinder 4, wherein the hydraulic cylinder 4 comprises a hydraulic control pipeline, and the hydraulic control pipeline comprises a first control component 1, a second control component 2 and a third control component 3;
the second control assembly 2 comprises an electromagnetic directional valve 20, the electromagnetic directional valve 20 comprises four ports, a port P1 is communicated with a main oil supply pipeline D through a pipeline, the other end of the main oil supply pipeline D is communicated with an oil tank 5, a port T1 is communicated with a main oil return pipeline C through a pipeline, the other end of the main oil return pipeline C is communicated with the oil tank 5, a port B202 is communicated with a rodless cavity A of the hydraulic cylinder through a first pipeline A1, a port A201 is communicated with a rod cavity B of the hydraulic cylinder through a second pipeline B1, and the electromagnetic directional valve 20 is used for controlling the proportion of oil output and oil return;
the first control component 1 comprises a plate type throttling stop valve 15 and an energy accumulator 17, the plate type throttling stop valve 15 is matched with the energy accumulator 17 to supplement oil in an oil supply pipeline and maintain pressure balance in a hydraulic system, the third control component 3 comprises a pilot sequence valve 31, and the pilot sequence valve 31 is used for solving the problem that the lifting device automatically slips down.
The first control assembly 1 comprises: the oil return control valve comprises a first high-pressure ball valve 11, a second high-pressure ball valve 12, a first pressure measuring joint 13, a second pressure measuring joint 14 and a one-way valve 18, wherein the second high-pressure ball valve 12, the first pressure measuring joint 13 and a port B202 are located on a main oil return pipeline C, and the first high-pressure ball valve 11, the second pressure measuring joint 14, the one-way valve 18 and a port A201 of an electromagnetic directional valve 20 are located on a main oil supply pipeline D.
The outlet of the second high-pressure ball valve 12 is connected with the port T of the oil tank 5, the inlet of the second high-pressure ball valve 12 is connected with the port T1 of the electromagnetic directional valve 20 of the second control assembly 2, the first pressure measuring joint 13 is positioned on a pipeline between the second high-pressure ball valve 12 and the directional valve 20, the outlet of the first high-pressure ball valve 11 is connected with the inlet of the one-way valve 18, and the outlet of the one-way valve 18 is connected with the port P1 of the electromagnetic directional valve 20.
The second control assembly 2 further comprises a superposition type double one-way throttle valve 21 and a superposition type hydraulic control one-way valve 22, the superposition type double one-way throttle valve 21 comprises a superposition type double one-way throttle valve A cavity 210 and a superposition type double one-way throttle valve B cavity 211, the superposition type hydraulic control one-way valve 22 comprises a superposition type hydraulic control one-way valve A cavity 220 and a superposition type hydraulic control one-way valve B cavity 221, a port B of the electromagnetic directional valve, the superposition type double one-way throttle valve B cavity 211 and the superposition type hydraulic control one-way valve B cavity 221 are located on a first pipeline A1, and the port A of the electromagnetic directional valve, the superposition type double one-way throttle valve A cavity 210 and the superposition type hydraulic control one-way valve A cavity 220 are located on a second pipeline B1.
The outlet of the superposed double one-way throttle valve A cavity 210 is connected with a port A201 of the electromagnetic directional valve 20, the inlet of the superposed double one-way throttle valve A cavity 210 is connected with the outlet of a superposed hydraulic control one-way valve A cavity 220, the inlet of a superposed double one-way throttle valve B cavity 211 is connected with a port B202 of the electromagnetic directional valve 20, and the outlet of the superposed double one-way throttle valve B cavity 211 is connected with the inlet of a superposed hydraulic control one-way valve B cavity 221.
The third control assembly 3 further includes a third pressure measuring joint 32, a fourth pressure measuring joint 33, a third high-pressure ball valve 34, and a fourth high-pressure ball valve 35, the pilot-operated sequence valve 31, the third pressure measuring joint 32, and the fourth high-pressure ball valve 35 are located on the first pipeline a1, and the fourth pressure measuring joint 33 and the third high-pressure ball valve 34 are located on the second pipeline B1.
An inlet of the pilot sequence valve 31 is connected with an outlet of a superposition type pilot-controlled check valve B cavity 221 of the second control assembly 2, an outlet of the pilot sequence valve 31 is connected with an inlet of a fourth high-pressure ball valve 35, the third pressure measuring joint 32 is connected on a pipeline between the pilot sequence valve 31 and the fourth high-pressure ball valve 35, an outlet of the fourth high-pressure ball valve 35 is connected with a rodless cavity A of a hydraulic cylinder, an outlet of the third high-pressure ball valve 34 is connected with an inlet of a superposition type pilot-controlled check valve A cavity 220, the fourth pressure measuring joint 33 is connected on a pipeline between the third high-pressure ball valve 34 and the superposition type pilot-controlled check valve 22, and an inlet of the third high-pressure ball valve 34 is connected with a rod cavity B of the hydraulic cylinder.
The first control assembly 1 further comprises a plate-type high-pressure ball valve 16, the plate-type throttling stop valve 15, the plate-type high-pressure ball valve 16 and the energy accumulator 17 are located on a pipeline between the one-way valve 18 and the electromagnetic reversing valve 20, the energy accumulator 17 is connected with the plate-type throttling stop valve 15, the plate-type throttling stop valve 15 is connected with the plate-type high-pressure ball valve 16, one end of the plate-type throttling stop valve 16, connected with the pipeline between the one-way valve 18 and the electromagnetic reversing valve 20, of the plate-type throttling stop valve 15 is connected with the pipeline between the second high-pressure ball valve 12 and the reversing valve.
The specific embodiment is as follows:
the main oil return pipeline C is communicated with the first pipeline A1 through the electromagnetic directional valve 20, the main oil supply pipeline D is communicated with the second pipeline B1 through the electromagnetic directional valve 20, two groups of pipelines can output oil or input oil, the electromagnetic directional valve 20 is electrified, the oil is input into a rodless cavity of a hydraulic cylinder, the feeding lifting device rises to reach the position, the electromagnetic directional valve 20 loses the electricity, the feeding trolley lifting device realizes the position maintenance through the dual action of the first control component 2 and the third control component 1, the superposition type hydraulic control one-way valve 22 solves the defect that stable back pressure cannot be realized due to the reasons of a pilot type sequence valve 31, a high-pressure ball valve or quality problems, and the like, the pilot type sequence valve 31 well makes up the defect that the superposition type hydraulic control one-way valve 22 slightly slips due to the lack of self-tightness and is matched with the two, avoids respective defects, and ensures the normal operation of the system, the asynchronism of action among the lifting devices of the multiple feeding trolleys is solved, so that the hot steel can smoothly enter the conveying track with a small bending radian, and the steel rolling process is ensured to be smoothly executed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a material loading dolly elevating gear hydraulic control system, includes pneumatic cylinder (4), and pneumatic cylinder (4) include hydraulic control pipeline, its characterized in that: the hydraulic control pipeline comprises a first control assembly (1), a second control assembly (2) and a third control assembly (3);
the second control assembly (2) comprises an electromagnetic directional valve (20), the electromagnetic directional valve (20) comprises four ports, a port P1 is communicated with a main oil supply pipeline (D) through a pipeline, the other end of the main oil supply pipeline (D) is communicated with an oil tank (5), a port T1 is communicated with a main oil return pipeline (C) through a pipeline, the other end of the main oil return pipeline (C) is communicated with the oil tank (5), a port B (202) is communicated with a rodless cavity (A) of the hydraulic cylinder through a first pipeline (A1), a port A (201) is communicated with a rod cavity (B) of the hydraulic cylinder through a second pipeline (B1), and the electromagnetic directional valve (20) is used for controlling the proportion of oil output and oil return;
the first control assembly (1) comprises a plate type throttling stop valve (15) and an energy accumulator (17), the plate type throttling stop valve (15) is matched with the energy accumulator (17) to supplement oil quantity in an oil supply pipeline and maintain pressure balance in a hydraulic system, the third control assembly (3) comprises a pilot sequence valve (31), and the pilot sequence valve (31) is used for solving the problem that the lifting device automatically slips down.
2. The hydraulic control system of the feeding trolley lifting device as claimed in claim 1, characterized in that: the first control assembly (1) comprises: first high-pressure ball valve (11), second high-pressure ball valve (12), first pressure measurement joint (13), second pressure measurement joint (14), check valve (18), second high-pressure ball valve (12), first pressure measurement joint (13), port B (202) are located main oil return pipeline (C), port A (201) of first high-pressure ball valve (11), second pressure measurement joint (14), check valve (18), solenoid directional valve (20) are located main oil supply pipeline (D).
3. The hydraulic control system of the feeding trolley lifting device as claimed in claim 2, characterized in that: the outlet of the second high-pressure ball valve (12) is connected with a T port of the oil tank (5), the inlet of the second high-pressure ball valve (12) is connected with a port T1 of an electromagnetic directional valve (20) of the second control assembly (2), the first pressure measuring joint (13) is positioned on a pipeline between the second high-pressure ball valve (12) and the directional valve (20), the outlet of the first high-pressure ball valve (11) is connected with the inlet of a one-way valve (18), and the outlet of the one-way valve (18) is connected with a port P1 of the electromagnetic directional valve (20).
4. The hydraulic control system of the feeding trolley lifting device as claimed in claim 1, characterized in that: second control assembly (2) still include two check throttle valves of stack formula (21), stack formula liquid accuse check valve (22), two check throttle valves of stack formula (21) are including two check throttle valve A chambeies of stack formula (210), two check throttle valve B chambeies of stack formula (211), stack formula liquid accuse check valve (22) are including stack formula liquid accuse check valve A chamber (220), stack formula liquid accuse check valve B chamber (221), the port B of solenoid directional valve, two check throttle valve B chambeies of stack formula (211), stack formula liquid accuse check valve B chamber (221) are located first pipeline (A1), the port A of solenoid directional valve, two check throttle valve A chambeies of stack formula (210), stack formula liquid accuse check valve A chamber (220) are located second pipeline (B1).
5. The hydraulic control system of a feeding trolley lifting device as claimed in claim 4, characterized in that: the port A (201) of exit linkage solenoid directional valve (20) of two check throttle valve A chambeies of stack formula (210), the export of the entry linkage stack formula pilot operated check valve A chamber (220) of two check throttle valve A chambeies of stack formula (210), port B (202) of the entry linkage solenoid directional valve (20) of two check throttle valve B chambeies of stack formula (211), the entry of the exit linkage stack formula pilot operated check valve B chamber (221) of two check throttle valve B chambeies of stack formula (211).
6. The hydraulic control system of the feeding trolley lifting device as claimed in claim 1, characterized in that: the third control assembly (3) further comprises a third pressure measuring joint (32), a fourth pressure measuring joint (33), a third high-pressure ball valve (34) and a fourth high-pressure ball valve (35), the pilot-operated sequence valve (31), the third pressure measuring joint (32) and the fourth high-pressure ball valve (35) are located on the first pipeline (A1), and the fourth pressure measuring joint (33) and the third high-pressure ball valve (34) are located on the second pipeline (B1).
7. The hydraulic control system of a feeding trolley lifting device as claimed in claim 6, characterized in that: the inlet of the pilot sequence valve (31) is connected with the outlet of a superposition type pilot-controlled check valve B cavity (221) of the second control assembly (2), the outlet of the pilot sequence valve (31) is connected with the inlet of a fourth high-pressure ball valve (35), a third pressure measuring joint (32) is connected on a pipeline between the pilot sequence valve (31) and the fourth high-pressure ball valve (35), the outlet of the fourth high-pressure ball valve (35) is connected with a rodless cavity (A) of a hydraulic cylinder, the outlet of the third high-pressure ball valve (34) is connected with the inlet of a superposition type pilot-controlled check valve A cavity (220), a fourth pressure measuring joint (33) is connected on a pipeline between the third high-pressure ball valve (34) and the pilot-controlled check valve (22), and the inlet of the third high-pressure ball valve (34) is connected with a rod cavity (B) of the hydraulic cylinder.
8. The hydraulic control system for the lifting device of the feeding trolley as claimed in claim 1, 2 or 3, wherein: the first control assembly (1) further comprises a plate-type high-pressure ball valve (16), the plate-type throttling stop valve (15), the plate-type high-pressure ball valve (16) and the energy accumulator (17) are located on a pipeline between the one-way valve (18) and the electromagnetic reversing valve (20), the energy accumulator (17) is connected with the plate-type throttling stop valve (15), the plate-type throttling stop valve (15) is connected with the plate-type high-pressure ball valve (16), one end of the plate-type throttling stop valve (15) is connected on the pipeline between the one-way valve (18) and the electromagnetic reversing valve (20), and the other end of the plate-type throttling stop valve is connected on the pipeline between the second high-pressure ball valve (12) and the reversing valve (.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020087743.8U CN212003782U (en) | 2020-01-15 | 2020-01-15 | Hydraulic control system for lifting device of feeding trolley |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020087743.8U CN212003782U (en) | 2020-01-15 | 2020-01-15 | Hydraulic control system for lifting device of feeding trolley |
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| CN212003782U true CN212003782U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120424A (en) * | 2020-01-15 | 2020-05-08 | 天津市中重科技工程有限公司 | Hydraulic control system for lifting device of feeding trolley |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120424A (en) * | 2020-01-15 | 2020-05-08 | 天津市中重科技工程有限公司 | Hydraulic control system for lifting device of feeding trolley |
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Address after: No.16, Jingxiang Road, Science Park, Beichen District, Tianjin, 300409 Patentee after: Zhongzhong Technology (Tianjin) Co.,Ltd. Address before: No.16, Jingxiang Road, Science Park, Beichen District, Tianjin, 300409 Patentee before: TIANJIN ZHONGZHONG SCIENCE TECHNOLOGY & ENGINEERING Co.,Ltd. |