CN103148043A - Four-motor revolution multilevel speed adjusting valve - Google Patents
Four-motor revolution multilevel speed adjusting valve Download PDFInfo
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- CN103148043A CN103148043A CN2013101137702A CN201310113770A CN103148043A CN 103148043 A CN103148043 A CN 103148043A CN 2013101137702 A CN2013101137702 A CN 2013101137702A CN 201310113770 A CN201310113770 A CN 201310113770A CN 103148043 A CN103148043 A CN 103148043A
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Abstract
The invention relates to a four-motor revolution multilevel speed adjusting valve which can be used for realizing the multilevel speed adjustability of four fixed constant displacement motors and solving the problems that a variable displacement motor is high in replacement cost and high in failure rate. The four-motor revolution multilevel speed adjusting valve is formed by combining and integrating a valve body. a directional control cartridge valve component arranged in the valve body, a shuttle valve component, an electromagnetic directional valve component and a detachable damping plug, so that the four-motor revolution multilevel speed adjusting valve achieves multiple functions for speed adjustment of a slewer, has the advantages of not tubular design, compact and reasonable compact, high flow capacity, small pressure loss, convenience in adjustment, low cost and the like, and is suitable for being popularized and used in a four-motor revolution occasion.
Description
Technical field
The present invention relates to a kind of with heavy load, the series flow control valve that can 360 uses on the rotating four motor operations devices of degree, especially relate to a kind of be specially adapted to revolve dig the four motors revolution multistep speed regulation valves that use on the rotary systems such as brill, horizontal directional drill, jumbolter.
Background technique
Along with engineering machinery such as excavator, horizontal directional drill, jumbolters to large scale development, moment of torsion to its revolution equipment unit head has proposed requirements at the higher level, to such an extent as to upgrade to four motors or the Thomas reaches the revolution equipment by original double motor swivel gear.Yet different operating modes have different rotating speed demands, and due to the restriction of peak output and the impact of efficiency of construction, so that unit head rotating speed demand is multistage adjustable.Adjustable in order to realize speed, usually adopt the double speed variable displacement motor, yet its cost is high, rate of fault is high.
In addition, when running into load changing in the rotating process of revolution equipment, equally pressure pulse will appear, to the harm in working life of hydraulic element.
Summary of the invention
Purpose of the present invention provides a kind of four motor revolution multistep speed regulation valves just for existing deficiency in above-mentioned prior art.Series flow control valve of the present invention can realize fixed system or fixed displacement motor system speed (or moment of torsion) multistage adjustable, thereby reduce to greatest extent system cost, improve the reliability of system.Except realize power rotation equipment speed and moment of torsion multistage adjustable, the pressure pulse that can avoid turning course to cause because of load changing.Thereby improve stability, the reliability of hydraulic system, improve the working life of hydraulic element.
Purpose of the present invention can realize by following technique measures:
Four motor revolution multistep speed regulation valves of the present invention comprise valve body, be arranged on the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port, the 5th hydraulic fluid port, the 6th hydraulic fluid port, the 7th hydraulic fluid port, the 8th hydraulic fluid port, the 9th hydraulic fluid port, the tenth hydraulic fluid port on valve body, the 11 hydraulic fluid port, the 12 hydraulic fluid port; Be arranged on the interior first direction control cartridge valve assembly of valve body, second direction control cartridge valve assembly, third direction control cartridge valve assembly, four directions to controlling cartridge valve assembly, the 5th direction control cartridge valve assembly, the 6th direction control cartridge valve assembly, the 7th direction control cartridge valve assembly, all directions to controlling cartridge valve assembly, the 9th direction control cartridge valve assembly and the first electromagnetic switch valve assembly, the second electromagnetic switch valve assembly, shuttle valve assembly and damping plug; Wherein: described the first hydraulic fluid port, first direction are controlled cartridge valve assembly hydraulic fluid port A, the four directions communicates to controlling cartridge valve assembly hydraulic fluid port A, the 7th direction control cartridge valve assembly hydraulic fluid port A and the tenth hydraulic fluid port; First direction is controlled cartridge valve assembly hydraulic fluid port B, the 4th hydraulic fluid port and second direction control cartridge valve assembly B mouth and is communicated; First direction is controlled cartridge valve assembly hydraulic fluid port C, third direction controls cartridge valve assembly hydraulic fluid port C, the 7th direction control cartridge valve assembly hydraulic fluid port C and the 9th direction control cartridge valve assembly hydraulic fluid port C communicates; Second direction is controlled cartridge valve assembly hydraulic fluid port A, third direction controls cartridge valve assembly hydraulic fluid port A and the 5th hydraulic fluid port communicates; The second hydraulic fluid port, the 3rd hydraulic fluid port, third direction are controlled cartridge valve assembly hydraulic fluid port B, the 6th direction controls cartridge valve assembly hydraulic fluid port B and the 9th direction control cartridge valve assembly hydraulic fluid port B communicates; The four directions communicates to controlling cartridge valve assembly hydraulic fluid port B, the 5th direction control cartridge valve assembly hydraulic fluid port B and the 6th hydraulic fluid port; The four directions communicates to controlling cartridge valve assembly hydraulic fluid port C and the 6th direction control cartridge valve assembly hydraulic fluid port C; The 5th direction is controlled cartridge valve assembly hydraulic fluid port A, the 6th direction controls cartridge valve assembly hydraulic fluid port A and the 7th hydraulic fluid port communicates; The 7th direction is controlled cartridge valve assembly hydraulic fluid port B, all directions communicates to controlling cartridge valve assembly hydraulic fluid port B and the 8th hydraulic fluid port; The all directions communicates to controlling cartridge valve assembly hydraulic fluid port A, the 9th direction control cartridge valve assembly hydraulic fluid port A and the 9th hydraulic fluid port; Described the first electromagnetic switch valve assembly hydraulic fluid port A, the second electromagnetic switch valve assembly hydraulic fluid port A, first direction are controlled cartridge valve assembly hydraulic fluid port C, third direction controls cartridge valve assembly hydraulic fluid port C, the 7th direction control cartridge valve assembly hydraulic fluid port C and the 9th direction control cartridge valve assembly hydraulic fluid port C communicates; The first electromagnetic switch valve assembly hydraulic fluid port B, second direction are controlled cartridge valve assembly C mouth, the second electromagnetic switch valve assembly hydraulic fluid port B and all directions and are communicated to controlling cartridge valve assembly hydraulic fluid port C; The first electromagnetic switch valve assembly hydraulic fluid port D and the 11 hydraulic fluid port communicate; The second electromagnetic switch valve assembly hydraulic fluid port C, four directions communicate to controlling cartridge valve assembly hydraulic fluid port C and the 6th direction control cartridge valve assembly hydraulic fluid port C; The second electromagnetic switch valve assembly hydraulic fluid port D and the 5th direction are controlled cartridge valve assembly hydraulic fluid port C and are communicated; Described shuttle valve assembly hydraulic fluid port A and the first hydraulic fluid port communicate; Shuttle valve assembly hydraulic fluid port B and the second hydraulic fluid port communicate, and shuttle valve assembly hydraulic fluid port C, the first electromagnetic switch valve assembly hydraulic fluid port C and the 12 hydraulic fluid port communicate; Described damping plug is arranged on shuttle valve assembly hydraulic fluid port C outlet port.
Described in the present invention first, second, third, fourth, the 5th, the 6th, the 7th, the 8th, that the 9th direction is controlled the cartridge valve modular construction is identical, be provided with Returnning spring, and forward and reverse cracking pressure approaches or equates.Described the first electromagnetic switch valve assembly is identical with the second solenoid directional control valve modular construction, is two four-way electromagnetic reversing valves, and its hydraulic fluid port A, B, C, D are high pressure resistant.Described shuttle valve assembly adopts linear sealing, selection pressure free of losses, leakage.
Beneficial effect of the present invention is as follows:
Series flow control valve of the present invention can realize fixed system or fixed displacement motor system speed (or moment of torsion) multistage adjustable, thereby reduce to greatest extent system cost, improve the reliability of system.Except realize power rotation equipment speed and moment of torsion multistage adjustable, the pressure pulse that can avoid turning course to cause because of load changing.Thereby improve stability, the reliability of hydraulic system, improve the working life of hydraulic element.
Description of drawings
Figure l is schematic diagram of the present invention.
Fig. 2 is the hydraulic diagram of 4 motor revolution equipment embodiments provided by the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment's (accompanying drawing):
as shown in Figure 1, four motor revolution multistep speed regulation valves of the present invention comprise valve body, be arranged on the first hydraulic fluid port (A), the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port (B1), the 5th hydraulic fluid port (A2), the 6th hydraulic fluid port (B2), the 7th hydraulic fluid port (A3), the 8th hydraulic fluid port (B3), the 9th hydraulic fluid port (A4), the tenth hydraulic fluid port (B4) on valve body, the 11 hydraulic fluid port (T), the 12 hydraulic fluid port (M), the first direction that is arranged in valve body is controlled cartridge valve assembly (2.1), second direction is controlled cartridge valve assembly (2.2), third direction is controlled cartridge valve assembly (2.3), the four directions is to controlling cartridge valve assembly (2.4), the 5th direction is controlled cartridge valve assembly (2.5), the 6th direction is controlled cartridge valve assembly (2.6), the 7th direction is controlled cartridge valve assembly (2.7), the all directions is to controlling cartridge valve assembly (2.8), the 9th direction is controlled cartridge valve assembly (2.9), and the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2), shuttle valve assembly (1) and damping plug (3), wherein: described the first hydraulic fluid port (A), first direction are controlled cartridge valve assembly (2.1) hydraulic fluid port A, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A and the tenth hydraulic fluid port (B4), first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port B, the 4th hydraulic fluid port (B1) and second direction control cartridge valve assembly (2.2) B mouth and is communicated, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction controls cartridge valve assembly (2.3) hydraulic fluid port C, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port A, third direction controls cartridge valve assembly (2.3) hydraulic fluid port A and the 5th hydraulic fluid port (A2) communicates, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), third direction are controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port B, the 5th direction control cartridge valve assembly (2.5) hydraulic fluid port B and the 6th hydraulic fluid port (B2), the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port C and the 6th direction control cartridge valve assembly (2.6) hydraulic fluid port C, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port A, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port A and the 7th hydraulic fluid port (A3) communicates, the 7th direction is controlled cartridge valve assembly (2.7) hydraulic fluid port B, all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port B and the 8th hydraulic fluid port (B3), the all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port A, the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port A and the 9th hydraulic fluid port (A4), described the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, first direction are controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction controls cartridge valve assembly (2.3) hydraulic fluid port C, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction are controlled cartridge valve assembly (2.2) C mouth, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B and all directions and are communicated to controlling cartridge valve assembly (2.8) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D and the 11 hydraulic fluid port (T) communicate, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, four directions communicate to controlling cartridge valve assembly (2.4) hydraulic fluid port C and the 6th direction control cartridge valve assembly (2.6) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D and the 5th direction are controlled cartridge valve assembly (2.5) hydraulic fluid port C and are communicated, described shuttle valve assembly (1) hydraulic fluid port A and the first hydraulic fluid port (A) communicate, shuttle valve assembly (1) hydraulic fluid port B and the second hydraulic fluid port (B) communicate, and shuttle valve assembly (1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C and the 12 hydraulic fluid port (M) communicate, described damping plug (3) is arranged on shuttle valve assembly (1) hydraulic fluid port C outlet port.
Described in the present invention first, second, third, fourth, the 5th, the 6th, the 7th, the 8th, that the 9th direction is controlled the cartridge valve modular construction is identical, be provided with Returnning spring, and forward and reverse cracking pressure approaches or equates; Described the first electromagnetic switch valve assembly (4.1) is identical with the second electromagnetic switch valve assembly (4.2) structure, is two four-way electromagnetic reversing valves, and its hydraulic fluid port A, B, C, D are high pressure resistant; Described shuttle valve assembly (1) adopts linear sealing; Damping plug (3) is for being provided with interior six side's double-screw bolts of damping hole.
Working principle of the present invention is as follows:
With reference to shown in Figure 1, the first electromagnetic switch valve assembly (4.1) is not when charged, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C communicate, and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D communicate; The first electromagnetic switch valve assembly (4.1) is when charged, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D communicate, and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B and the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C communicate.The second electromagnetic switch valve assembly (4.2) is not when charged, and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C communicate; The second electromagnetic switch valve assembly (4.2) hydraulic fluid port B and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D communicate; The second electromagnetic switch valve assembly (4.2) is when charged, and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D communicate; The second electromagnetic switch valve assembly (4.2) hydraulic fluid port B and the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C communicate.
Described the first, second, third, fourth, the 5th, the 6th, the 7th, the 8th, the 9th direction is controlled the cartridge valve assembly, when its hydraulic fluid port C place pressure equals hydraulic fluid port B place pressure (or hydraulic fluid port A place pressure), this direction is controlled the cartridge valve assembly and is closed, and namely hydraulic fluid port A, hydraulic fluid port B, the hydraulic fluid port C of this direction control cartridge valve assembly are not connected; When its hydraulic fluid port C place pressure took back oil, this direction was controlled cartridge valve assembly and is opened, and namely this direction hydraulic fluid port A, hydraulic fluid port B of controlling the cartridge valve assembly communicates.
Described shuttle valve assembly (1), when its hydraulic fluid port A place pressure during greater than (or less than) hydraulic fluid port B pressure, its hydraulic fluid port A(or hydraulic fluid port B) and hydraulic fluid port C communicate.
as shown in Figure 2, not charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is not charged, when the first hydraulic fluid port (A) oil-feed, the second hydraulic fluid port (B) oil return, namely the first hydraulic fluid port (A) pressure is greater than the second hydraulic fluid port (B) pressure, and the first hydraulic fluid port (A) is controlled cartridge valve assembly (2.1) hydraulic fluid port A with shuttle valve assembly (1) hydraulic fluid port A, first direction respectively, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A, the tenth hydraulic fluid port (B4) and motor 4 hydraulic fluid port A, the second hydraulic fluid port (B) respectively with shuttle valve assembly (1) hydraulic fluid port B, the 3rd hydraulic fluid port (A1), motor 1 hydraulic fluid port B, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, be shuttle valve assembly (1) hydraulic fluid port A pressure greater than shuttle valve assembly (1) hydraulic fluid port B pressure, the first hydraulic fluid port (A) and shuttle valve assembly (1) hydraulic fluid port A, shuttle valve assembly (1) hydraulic fluid port C, damping plug (3), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction is controlled cartridge valve assembly (2.9) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C and is communicated, again due to the 11 hydraulic fluid port (T), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B, the all directions is to controlling cartridge valve assembly (2.8) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D and the 5th direction are controlled cartridge valve assembly (2.5) hydraulic fluid port C and are communicated, and namely first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C pressure, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C pressure, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C pressure, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C pressure, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C pressure and the 9th direction is controlled cartridge valve assembly (2.9) hydraulic fluid port C pressure, all equals the first hydraulic fluid port (A) pressure, and second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C pressure, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C pressure, the all directions all equals the 11 hydraulic fluid port (T) pressure to controlling cartridge valve assembly (2.8) hydraulic fluid port C, and first direction is controlled cartridge valve assembly (2.1), third direction is controlled cartridge valve assembly (2.3), cartridge valve assembly (2.6) is controlled to controlling cartridge valve assembly (2.4) and the 6th direction in the four directions, the 7th direction controls cartridge valve assembly (2.7) and the 9th direction control cartridge valve assembly (2.9) is closed, and second direction is controlled cartridge valve assembly (2.2), the 5th direction controls cartridge valve assembly (2.5) and open to controlling cartridge valve assembly (2.8) in all directions, final the first hydraulic fluid port (A) and the tenth hydraulic fluid port (B4) communicate, the 9th hydraulic fluid port (A4) and the 8th hydraulic fluid port (B3) communicate, the 7th hydraulic fluid port (A3) and the 6th hydraulic fluid port (B2) communicate, the 5th hydraulic fluid port (A2) and the 4th hydraulic fluid port (B1) communicate, the 3rd hydraulic fluid port (A1) and the second hydraulic fluid port (B) communicate, and namely realize motor 1, motor 2, motor 3, motor 4 series connection.In like manner, not charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is not charged, when the first hydraulic fluid port (A) oil return, the second hydraulic fluid port (B) oil-feed, the first hydraulic fluid port (A) and the tenth hydraulic fluid port (B4) communicate, the 9th hydraulic fluid port (A4) and the 8th hydraulic fluid port (B3) communicate, the 7th hydraulic fluid port (A3) and the 6th hydraulic fluid port (B2) communicate, the 5th hydraulic fluid port (A2) and the 4th hydraulic fluid port (B1) communicate, the 3rd hydraulic fluid port (A1) and the second hydraulic fluid port (B) communicate, namely realize motor 1, motor 2, motor 3, motor 4 series connection, just the motor rotation direction is opposite.
charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is not charged, when the first hydraulic fluid port (A) oil-feed, the second hydraulic fluid port (B) oil return, namely the first hydraulic fluid port (A) pressure is greater than the second hydraulic fluid port (B) pressure, and the first hydraulic fluid port (A) is controlled cartridge valve assembly (2.1) hydraulic fluid port A with shuttle valve assembly (1) hydraulic fluid port A, first direction respectively, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A, the tenth hydraulic fluid port (B4) and motor 4 hydraulic fluid port A, the second hydraulic fluid port (B) respectively with shuttle valve assembly (1) hydraulic fluid port B, the 3rd hydraulic fluid port (A1), motor 1 hydraulic fluid port B, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, be shuttle valve assembly (1) hydraulic fluid port A pressure greater than shuttle valve assembly (1) hydraulic fluid port B pressure, the first hydraulic fluid port (A) and shuttle valve assembly (1) hydraulic fluid port A, shuttle valve assembly (1) hydraulic fluid port C, damping plug (3), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C, the all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port C, again due to the 11 hydraulic fluid port (T), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, and namely first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C pressure, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C pressure, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C pressure, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C pressure, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C pressure and the 9th direction is controlled cartridge valve assembly (2.9) hydraulic fluid port C pressure, all equals the 11 hydraulic fluid port (T) pressure, and second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C pressure, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C pressure, the all directions all equals the first hydraulic fluid port (A) pressure to controlling cartridge valve assembly (2.8) hydraulic fluid port C pressure, is high pressure, and first direction is controlled cartridge valve assembly (2.1), third direction is controlled cartridge valve assembly (2.3), cartridge valve assembly (2.6) is controlled to controlling cartridge valve assembly (2.4) and the 6th direction in the four directions, the 7th direction controls cartridge valve assembly (2.7) and the 9th direction control cartridge valve assembly (2.9) is opened, and second direction is controlled cartridge valve assembly (2.2), the 5th direction controls cartridge valve assembly (2.5) and all directions is closed to controlling cartridge valve assembly (2.8), final the first hydraulic fluid port (A), the 4th hydraulic fluid port (B1), the 6th hydraulic fluid port (B2), the 8th hydraulic fluid port (B3), the tenth hydraulic fluid port (B4) communicates, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), the 5th hydraulic fluid port (A2), the 7th hydraulic fluid port (A3), the 9th hydraulic fluid port (A4) communicates, and namely realizes motor 1, motor 2, motor 3, motor 4 parallel connections.In like manner, charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is not charged, when the first hydraulic fluid port (A) oil return, the second hydraulic fluid port (B) oil-feed, the first hydraulic fluid port (A), the 4th hydraulic fluid port (B1), the 6th hydraulic fluid port (B2), the 8th hydraulic fluid port (B3), the tenth hydraulic fluid port (B4) communicate, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), the 5th hydraulic fluid port (A2), the 7th hydraulic fluid port (A3), the 9th hydraulic fluid port (A4) communicate, namely realize motor 1, motor 2, motor 3, motor 4 parallel connections, just the motor rotation direction is opposite.At the first hydraulic fluid port (A) or the second hydraulic fluid port (B) when input/output condition is constant (flow and Maximum operating pressure are constant), the moment of torsion of these control mode four motor outputs is 4 times in four motor series connection situations, and the speed of output is 1/4 times in four motor series connection situations.
not charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is charged, when the first hydraulic fluid port (A) oil-feed, the second hydraulic fluid port (B) oil return, namely the first hydraulic fluid port (A) pressure is greater than the second hydraulic fluid port (B) pressure, and the first hydraulic fluid port (A) is controlled cartridge valve assembly (2.1) hydraulic fluid port A with shuttle valve assembly (1) hydraulic fluid port A, first direction respectively, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A, the tenth hydraulic fluid port (B4) and motor 4 hydraulic fluid port A, the second hydraulic fluid port (B) respectively with shuttle valve assembly (1) hydraulic fluid port B, the 3rd hydraulic fluid port (A1), motor 1 hydraulic fluid port B, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, be shuttle valve assembly (1) hydraulic fluid port A pressure greater than shuttle valve assembly (1) hydraulic fluid port B pressure, the first hydraulic fluid port (A) and shuttle valve assembly (1) hydraulic fluid port A, shuttle valve assembly (1) hydraulic fluid port C, damping plug (3), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, again due to the 11 hydraulic fluid port (T), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C, the all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port C, and namely first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C pressure, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C pressure, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C pressure, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C pressure and the 9th direction is controlled cartridge valve assembly (2.9) hydraulic fluid port C pressure, all equals the first hydraulic fluid port (A) pressure, is high pressure, and second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C pressure, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C pressure, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C pressure, the all directions all equals the 11 hydraulic fluid port (T) pressure to controlling cartridge valve assembly (2.8) hydraulic fluid port C pressure, and namely first direction is controlled cartridge valve assembly (2.1), third direction is controlled cartridge valve assembly (2.3), the 5th direction is controlled cartridge valve assembly (2.5), the 7th direction controls cartridge valve assembly (2.7) and the 9th direction control cartridge valve assembly (2.9) is closed, and second direction is controlled cartridge valve assembly (2.2), cartridge valve assembly (2.6) is controlled to controlling cartridge valve assembly (2.4) and the 6th direction in the four directions, open to controlling cartridge valve assembly (2.8) in all directions, final the first hydraulic fluid port (A), the 6th hydraulic fluid port (B2), the tenth hydraulic fluid port (B4) communicates, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1) and the 7th hydraulic fluid port (A3) communicate, and the 5th hydraulic fluid port (A2) and the 4th hydraulic fluid port (B1) communicate, and the 8th hydraulic fluid port (B3) and the 9th hydraulic fluid port (A4) communicate, and namely realize motor 1, motor 2 is connected afterwards and motor 3, in parallel after motor 4 series connection.in like manner, when the first electromagnetic switch valve assembly (4.1) not charged, the second electromagnetic switch valve assembly (4.2) is charged, the first hydraulic fluid port (A) oil return, during the second hydraulic fluid port (B) oil-feed, the first hydraulic fluid port (A), the 6th hydraulic fluid port (B2), the tenth hydraulic fluid port (B4) communicates, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1) and the 7th hydraulic fluid port (A3) communicate, the 5th hydraulic fluid port (A2) and the 4th hydraulic fluid port (B1) communicate, the 8th hydraulic fluid port (B3) and the 9th hydraulic fluid port (A4) communicate, namely realize motor 1, motor 2 is connected afterwards and motor 3, in parallel after motor 4 series connection, namely realize motor 1, motor 2 is connected afterwards and motor 3, in parallel after motor 4 series connection, just the motor rotation direction is opposite.At the first hydraulic fluid port (A) or the second hydraulic fluid port (B) when input/output condition is constant (flow and Maximum operating pressure are constant), the moment of torsion of these control mode four motor outputs is 2 times in four motor series connection situations, and the speed of output is 1/2 times in four motor series connection situations.
charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is charged, when the first hydraulic fluid port (A) oil-feed, the second hydraulic fluid port (B) oil return, namely the first hydraulic fluid port (A) pressure is greater than the second hydraulic fluid port (B) pressure, and the first hydraulic fluid port (A) is controlled cartridge valve assembly (2.1) hydraulic fluid port A with shuttle valve assembly (1) hydraulic fluid port A, first direction respectively, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A, the tenth hydraulic fluid port (B4) and motor 4 hydraulic fluid port A, the second hydraulic fluid port (B) respectively with shuttle valve assembly (1) hydraulic fluid port B, the 3rd hydraulic fluid port (A1), motor 1 hydraulic fluid port B, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, be shuttle valve assembly (1) hydraulic fluid port A pressure greater than shuttle valve assembly (1) hydraulic fluid port B pressure, the first hydraulic fluid port (A) and shuttle valve assembly (1) hydraulic fluid port A, shuttle valve assembly (1) hydraulic fluid port C, damping plug (3), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C, the all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port C, again due to the 11 hydraulic fluid port (T), the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction is controlled cartridge valve assembly (2.3) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, and namely second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port C pressure, the four directions is to controlling cartridge valve assembly (2.4) hydraulic fluid port C pressure, the 6th direction is controlled cartridge valve assembly (2.6) hydraulic fluid port C pressure, the all directions all equals the first hydraulic fluid port (A) pressure to controlling cartridge valve assembly (2.8) hydraulic fluid port C pressure, is high pressure, and first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C pressure, third direction controls cartridge valve assembly (2.3) hydraulic fluid port C pressure and the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port C pressure, the 7th direction controls cartridge valve assembly (2.7) hydraulic fluid port C pressure and the 9th direction is controlled cartridge valve assembly (2.9) hydraulic fluid port C pressure, all equals the 11 hydraulic fluid port (T) pressure, and namely first direction is controlled cartridge valve assembly (2.1), third direction controls cartridge valve assembly (2.3) and the 5th direction is controlled cartridge valve assembly (2.5), the 7th direction controls cartridge valve assembly (2.7) and the 9th direction control cartridge valve assembly (2.9) is opened, and second direction is controlled cartridge valve assembly (2.2), the four directions is to controlling cartridge valve assembly (2.4), the 6th direction is controlled cartridge valve assembly (2.6), the all directions is closed to controlling cartridge valve assembly (2.8), final the first hydraulic fluid port (A), the 4th hydraulic fluid port (B1), the 8th hydraulic fluid port (B3) and the tenth hydraulic fluid port (B4) communicate, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1) and the 5th hydraulic fluid port (A2), the 9th hydraulic fluid port (A4) communicates, and the 7th hydraulic fluid port (A3) and the 6th hydraulic fluid port (B2) communicate, and namely realize motor 2, after motor 3 series connection respectively with motor 1, motor 4 parallel connections.In like manner, charged when the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2) is charged, when the first hydraulic fluid port (A) oil return, the second hydraulic fluid port (B) oil-feed, the first hydraulic fluid port (A), the 4th hydraulic fluid port (B1), the 8th hydraulic fluid port (B3) and the tenth hydraulic fluid port (B4) communicate, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1) and the 5th hydraulic fluid port (A2), the 9th hydraulic fluid port (A4) communicate, the 7th hydraulic fluid port (A3) and the 6th hydraulic fluid port (B2) communicate, namely realize after 3 series connection of motor 2, motor respectively in parallelly with motor 1, motor 4, just the motor rotation direction is opposite.At the first hydraulic fluid port (A) or the second hydraulic fluid port (B) when input/output condition is constant (flow and Maximum operating pressure are constant), the moment of torsion of these control mode four motor outputs is 2 times in four motor series connection situations, and the speed of output is 1/2 times in four motor series connection situations.
Advantage of the present invention:
1, described a kind of four motor revolution multistep speed regulation valves, by fixed displacement motor, can realize that rotating speed and the moment of torsion of " four motor power swivel gears " is multistage adjustable;
2, described a kind of four motors revolutions multistep speed regulation valves, can effectively solve the double speed variable displacement motor regulate single, the problem that cost and rate of fault are high; Relatively the variable displacement motor system, adopt this valve and fixed displacement motor, and system cost will have decrease, and reliability promote also very effective;
3, described a kind of four motors revolution multistep speed regulation valves, have the advantages such as through-current capability is large, local pressure loss is little, contamination resistance is strong, compact structure, adjusting control convenience;
4, described a kind of four motor revolution multistep speed regulation valves, effectively absorption pressure sudden change and pulse, avoid the swivel gear shock and vibration, improved the working life of oil hydraulic motor.
Market prospects of the present invention:
At present, a lot of products, as: the high pulling torque choosing is dug brill, high pulling torque horizontal directional drill, high pulling torque anchor pole brill etc. with the high-power engineering machinery of revolution equipment, and its swivel gear is provided with 4 motors and drives (usually adopting the double speed variable displacement motor), yet variable displacement motor cost and rate of fault are high; For solve 4 motor swivel gear multistage speed, moment of torsion is adjustable, a kind of four motor revolution multistep speed regulation valves have been designed, solved and adopted that the highest fixed displacement motor of cost performance is realized multistage speed, moment of torsion is adjustable, and effectively absorption pressure sudden change and pulse, the working life of having improved oil hydraulic motor.
Claims (5)
1. a motor turns round the multistep speed regulation valve, it is characterized in that: comprise valve body, be arranged on the first hydraulic fluid port (A), the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), the 4th hydraulic fluid port (B1), the 5th hydraulic fluid port (A2), the 6th hydraulic fluid port (B2), the 7th hydraulic fluid port (A3), the 8th hydraulic fluid port (B3), the 9th hydraulic fluid port (A4), the tenth hydraulic fluid port (B4) on valve body, the 11 hydraulic fluid port (T), the 12 hydraulic fluid port (M), the first direction that is arranged in valve body is controlled cartridge valve assembly (2.1), second direction is controlled cartridge valve assembly (2.2), third direction is controlled cartridge valve assembly (2.3), the four directions is to controlling cartridge valve assembly (2.4), the 5th direction is controlled cartridge valve assembly (2.5), the 6th direction is controlled cartridge valve assembly (2.6), the 7th direction is controlled cartridge valve assembly (2.7), the all directions is to controlling cartridge valve assembly (2.8), the 9th direction is controlled cartridge valve assembly (2.9), and the first electromagnetic switch valve assembly (4.1), the second electromagnetic switch valve assembly (4.2), shuttle valve assembly (1) and damping plug (3), wherein: described the first hydraulic fluid port (A), first direction are controlled cartridge valve assembly (2.1) hydraulic fluid port A, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port A, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port A and the tenth hydraulic fluid port (B4), first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port B, the 4th hydraulic fluid port (B1) and second direction control cartridge valve assembly (2.2) B mouth and is communicated, first direction is controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction controls cartridge valve assembly (2.3) hydraulic fluid port C, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, second direction is controlled cartridge valve assembly (2.2) hydraulic fluid port A, third direction controls cartridge valve assembly (2.3) hydraulic fluid port A and the 5th hydraulic fluid port (A2) communicates, the second hydraulic fluid port (B), the 3rd hydraulic fluid port (A1), third direction are controlled cartridge valve assembly (2.3) hydraulic fluid port B, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port B and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port B communicates, the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port B, the 5th direction control cartridge valve assembly (2.5) hydraulic fluid port B and the 6th hydraulic fluid port (B2), the four directions communicates to controlling cartridge valve assembly (2.4) hydraulic fluid port C and the 6th direction control cartridge valve assembly (2.6) hydraulic fluid port C, the 5th direction is controlled cartridge valve assembly (2.5) hydraulic fluid port A, the 6th direction controls cartridge valve assembly (2.6) hydraulic fluid port A and the 7th hydraulic fluid port (A3) communicates, the 7th direction is controlled cartridge valve assembly (2.7) hydraulic fluid port B, all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port B and the 8th hydraulic fluid port (B3), the all directions communicates to controlling cartridge valve assembly (2.8) hydraulic fluid port A, the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port A and the 9th hydraulic fluid port (A4), described the first electromagnetic switch valve assembly (4.1) hydraulic fluid port A, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port A, first direction are controlled cartridge valve assembly (2.1) hydraulic fluid port C, third direction controls cartridge valve assembly (2.3) hydraulic fluid port C, the 7th direction control cartridge valve assembly (2.7) hydraulic fluid port C and the 9th direction control cartridge valve assembly (2.9) hydraulic fluid port C communicates, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port B, second direction are controlled cartridge valve assembly (2.2) C mouth, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port B and all directions and are communicated to controlling cartridge valve assembly (2.8) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port D and the 11 hydraulic fluid port (T) communicate, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port C, four directions communicate to controlling cartridge valve assembly (2.4) hydraulic fluid port C and the 6th direction control cartridge valve assembly (2.6) hydraulic fluid port C, the second electromagnetic switch valve assembly (4.2) hydraulic fluid port D and the 5th direction are controlled cartridge valve assembly (2.5) hydraulic fluid port C and are communicated, described shuttle valve assembly (1) hydraulic fluid port A and the first hydraulic fluid port (A) communicate, shuttle valve assembly (1) hydraulic fluid port B and the second hydraulic fluid port (B) communicate, and shuttle valve assembly (1) hydraulic fluid port C, the first electromagnetic switch valve assembly (4.1) hydraulic fluid port C and the 12 hydraulic fluid port (M) communicate, described damping plug (3) is arranged on shuttle valve assembly (1) hydraulic fluid port C outlet port.
2. four motors according to claim 1 turn round the multistep speed regulation valves, it is characterized in that: it is identical that described the first, second, third, fourth, the 5th, the 6th, the 7th, the 8th, the 9th direction is controlled the cartridge valve modular construction, be provided with Returnning spring, and forward and reverse cracking pressure approaches.
3. four motors according to claim 1 turn round the multistep speed regulation valves, it is characterized in that: described the first electromagnetic switch valve assembly (4.1) is identical with the second electromagnetic switch valve assembly (4.2) structure, be two four-way electromagnetic reversing valves, and its hydraulic fluid port A, B, C, D are high pressure resistant.
4. four motor revolution multistep speed regulation valves according to claim 1, is characterized in that: described shuttle valve assembly (1) employing linear sealing.
5. four motors according to claim 1 turn round the multistep speed regulation valves, it is characterized in that: damping plug (3) is for being provided with interior six side's double-screw bolts of damping hole.
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| CN201310113770.2A CN103148043B (en) | 2013-04-03 | 2013-04-03 | Four-motor revolution multilevel speed adjusting valve |
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| CN201310113770.2A CN103148043B (en) | 2013-04-03 | 2013-04-03 | Four-motor revolution multilevel speed adjusting valve |
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| CN103148043B CN103148043B (en) | 2015-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989950A (en) * | 2019-04-12 | 2019-07-09 | 中石化四机石油机械有限公司 | A kind of snubbing serving sets false rotary multilevel control system |
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| US20090145120A1 (en) * | 2007-12-11 | 2009-06-11 | Sauer-Danfoss Inc. | Method and circuit arrangement of the supply of pressue medium to at least two hydraulic consumers |
| CN202449733U (en) * | 2012-01-17 | 2012-09-26 | 江苏紫石机械制造有限公司 | Unloading energy-saving control system of variable pump of electro-hydraulic grab |
| CN203189375U (en) * | 2013-04-03 | 2013-09-11 | 郑州宇通重工有限公司 | Four-motor rotary multistage speed regulating valve |
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2013
- 2013-04-03 CN CN201310113770.2A patent/CN103148043B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213300A (en) * | 1979-01-22 | 1980-07-22 | International Harvester Company | Variable flow rate control with mechanical override for closed center valve |
| US4485623A (en) * | 1981-08-10 | 1984-12-04 | Clark Equipment Company | Vehicle hydraulic system with pump speed control |
| US20090145120A1 (en) * | 2007-12-11 | 2009-06-11 | Sauer-Danfoss Inc. | Method and circuit arrangement of the supply of pressue medium to at least two hydraulic consumers |
| CN101408108A (en) * | 2008-11-11 | 2009-04-15 | 浙江大学 | Shield cutter head hydraulic system driven bymixed motor serial connection and parallel connection |
| CN202449733U (en) * | 2012-01-17 | 2012-09-26 | 江苏紫石机械制造有限公司 | Unloading energy-saving control system of variable pump of electro-hydraulic grab |
| CN203189375U (en) * | 2013-04-03 | 2013-09-11 | 郑州宇通重工有限公司 | Four-motor rotary multistage speed regulating valve |
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| CN109989950A (en) * | 2019-04-12 | 2019-07-09 | 中石化四机石油机械有限公司 | A kind of snubbing serving sets false rotary multilevel control system |
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