CN104179743A - Modularized load-sensitive electric-hydraulic proportional multiway valve - Google Patents
Modularized load-sensitive electric-hydraulic proportional multiway valve Download PDFInfo
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Abstract
The invention relates to a modularized load-sensitive electric-hydraulic proportional multiway valve which comprises a load-sensitive pressure module, a proportional control valve guide oil source module, a logic control module, a proportional reversing module, a proportional guide control module, a plurality of main circuit function control modules and a connecting and transferring module, wherein the load-sensitive pressure module is used for controlling an oil source of the whole modularized load-sensitive electric-hydraulic proportional multiway valve, and comprises an overflow valve, a #1 throttle valve, a #2 stop valve and a first guide type overflow valve; the proportional control valve guide oil source module is connected with the external guide control oil source, and is used for providing the guide oil source for the modularized load-sensitive electric-hydraulic proportional multiway valve; the logic control module comprises a plurality of logic control valves; the proportional guide control module comprises a hydraulic control guide proportional valve or an electromagnetic proportional reversing valve, corresponding to the logic control module in quantity. The modularized load-sensitive electric-hydraulic proportional multiway valve has the benefits that the modularized load-sensitive electric-hydraulic proportional multiway valve which is convenient to mount and maintain, simple in structure, integrated, capable of being assembled, open and energy-saving is provided.
Description
Technical field
The present invention relates to a kind of multi-way control valve, relate in particular to the responsive electro-hydraulic proportional multi-way valve of a kind of modular load.
Background technique
At present, traditional proportional multi-path control valve, general utility functions are standards, as the flow of same group of valve, be in certain scope, once deciding, control form is also difficult to change, variable displacement pump load sensing circuit valve and metering pump open circuit valve function generally can not be changed, and on major loop, can not add the duty valves such as hydraulic lock, can not realize different valve mix flow functions in valve; In addition, load ratio function and regular tap can not be connected in series for energy threshold.
Summary of the invention
In view of the above-mentioned problems in the prior art, main purpose of the present invention is to address the deficiencies of the prior art, and the invention provides a kind of installation and maintenance, responsive electro-hydraulic proportional multi-way valve of simple in structure, integrated and energy-conservation modular load be convenient to.
The invention provides the responsive electro-hydraulic proportional multi-way valve of a kind of modular load, comprising:
Load-sensitive modular pressure, described load-sensitive modular pressure is for controlling the oil sources of the responsive electro-hydraulic proportional multi-way valve of whole modular load, it comprises relief valve, #1 throttle valve, #2 stop valve and the first pilot-type relief valve, the filler opening of described relief valve is connected in parallel to respectively P mouth and MP mouth, the external pressure gauge of described MP mouth, the oil outlet of described relief valve is connected in parallel to T mouth, the filler opening of described the first pilot-type relief valve is connected with the filler opening of described relief valve by #1 throttle valve, the filler opening of described the first pilot-type relief valve is connected in parallel to LS mouth by #2 stop valve, the oil outlet of described the first pilot-type relief valve is connected in parallel to the oil outlet of described relief valve, Z mouth is for external control oil sources, when external oil sources is load-reacting pump, described #1 throttle valve is communicated with described #2 stop valve simultaneously to be blocked, LS mouth is connected with the load-sensitive mouth of variable displacement pump, P mouth is connected with the pressure hydraulic fluid port of described variable displacement pump, T mouth is connected with oil return system, T1Kou Wei unloading port and being connected with oil sump tank, when external oil sources is load-sensitive metering pump, described #1 throttle valve blocks simultaneously described #2 stop valve and is communicated with, described LS mouth blocks,
Proportional control valve pilot control module, described proportional control valve pilot control module is controlled oil sources with external pilot and is connected for providing pilot control to the responsive electro-hydraulic proportional multi-way valve of described modular load, the A mouth of described proportional control valve pilot control module is connected in parallel to Z mouth, T mouth is connected in parallel to T1 mouth, and B mouth is connected in parallel to LS mouth for detection of the total LS feedback pressure of the responsive electro-hydraulic proportional multi-way valve of described modular load;
Logic control module, described Logic control module comprises a plurality of proportional control valves, described a plurality of proportional control valve is the first proportional control valve and the second proportional control valve, described the first proportional control valve and described the second proportional control valve include the second pilot-type relief valve, LS shuttle valve and two logical pressure-compensated valves, described two logical pressure-compensated valves are for keeping invariable at induced pressure or charge oil pressure variation Shi Shi actuator flow, the filler opening of described two logical pressure-compensated valves is connected in parallel to P mouth, in described the first proportional control valve, the return opening of LS shuttle valve is connected in LS mouth, in described the second proportional control valve, the return opening of LS shuttle valve is connected in a filler opening of LS shuttle valve in the first proportional control valve, one hydraulic fluid port of described two logical pressure-compensated valves, one filler opening of the filler opening of described the second pilot-type relief valve and LS shuttle valve is in parallel, the return opening of described the second pilot-type relief valve is connected in parallel to T1 mouth, in described the second proportional control valve, a filler opening of LS shuttle valve is connected in LS mouth,
Proportion pilot control module, described proportion pilot control module comprises a plurality of proportion pilot control valves, described a plurality of proportion pilot control valve is the first proportion pilot control valve and the second proportion pilot control valve, described the first proportion pilot control valve and described the second proportion pilot control valve are a kind of in hydraulic control proportion pilot control valve or automatically controlled proportion pilot control valve, and described hydraulic control proportion pilot control valve and automatically controlled proportion pilot control valve exchange as required;
Ratio inverting module, described ratio inverting module comprises hydraulic control guide proportion selector valve or the solenoid-operated proportional selector valve with described Logic control module respective amount, comprise the first hydraulic control proportional reversing valve and the second hydraulic control proportional reversing valve, the a mouth of described the first proportion pilot control module is connected with the left pilot port of described the first hydraulic control proportional reversing valve, the b mouth of described the first proportion pilot control module is connected with the right pilot port of described the first hydraulic control proportional reversing valve, the a mouth of described the second proportion pilot control module is connected with the left pilot port of described the second hydraulic control proportional reversing valve, the b mouth of described the second proportion pilot control module is connected with the right pilot port of described the second hydraulic control proportional reversing valve, described the first hydraulic control proportional reversing valve two each and every one hydraulic fluid ports are connected with T mouth and T1 mouth respectively, a hydraulic fluid port of described the first hydraulic control proportional reversing valve is connected with the return opening of described two logical pressure-compensated valves,
A plurality of major loop functional control modules, described a plurality of major loop control module is the first major loop control module and the second major loop control module, two hydraulic fluid ports of described the first major loop control module are connected in parallel to respectively T mouth, two hydraulic fluid ports of described the second major loop control module are connected in parallel to respectively T mouth, the A1 mouth of described the first major loop control module is connected with two hydraulic fluid ports of described the first hydraulic control proportional reversing valve respectively with B1 mouth, and the A2 mouth of described the second major loop control module is connected with two hydraulic fluid ports of described the second hydraulic control proportional reversing valve respectively with B2 mouth; And
Connect and interconnecting module, described connection and interconnecting module comprise valve and for the changeover valve piece of the different latus rectum valve groups of transferring, when front and back valve group flow differs larger, by described changeover valve piece, carry out transition, described P mouth, T mouth, LS mouth, T1 mouth and Z mouth are transitioned into rear valve piece group.
Optionally, described load-sensitive modular pressure, proportional control valve pilot control module, Logic control module, ratio inverting module, proportion pilot control module, major loop functional control module and connection and interconnecting module become one.
Optionally, described T mouth comprises a T mouth and the 2nd T mouth, and a described T mouth is for conventional, and described the 2nd T mouth is for standby.
Optionally, described P mouth comprises a P mouth and the 2nd P mouth, and a described P mouth is for conventional, and described the 2nd P mouth is for standby.
The present invention has the following advantages and beneficial effect: the responsive electro-hydraulic proportional multi-way valve of modular load that the present invention improves, realizing the loop of a plurality of different pressures flows can work simultaneously, and under different scaling signals is controlled, each loop is independent of each other each other and realizes in proportion different circuit assignment of traffic, and pass through LS feedback pressure signal to the constant-pressure variable pressure spot of load-reacting pump control pump, thereby the flow that the output system that realizes control pump needs, or specified rate pumping system feedback pressure signal is to the oil pressure relief of load-sensitive pressure valve dynamic control valve, realize the object of saving power, be that system needs how much power to feed back the proportional system that offers by LS, or low pressurized overflow, do not produce too much thermal power loss.Pass through modular organization, we can realize the multiloop mixing serial connection of multi-way valve proportional flow from 400L/min to 2L/min at present, by the expansion of function module, can realize ratio interflow in double pump and many pump valves, realize the mixed of proportional control valve group and common selector valve group and ride in same multi-way valve, integrated single or two equilibrium valve and hydraulic lock equivalent type valve member on valve block major loop.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the responsive electro-hydraulic proportional multi-way valve of modular load of the embodiment of the present invention;
Fig. 2 is the theory diagram of load-sensitive modular pressure in Fig. 1;
Fig. 3 is the theory diagram of proportional control valve pilot control module in Fig. 1;
Fig. 4 is the theory diagram of major loop functional control module in Fig. 1;
Fig. 5 connects in Fig. 1 and the theory diagram of interconnecting module.
Embodiment
The present invention is further illustrated with specific embodiment below with reference to accompanying drawings.
As shown in Figure 1: the responsive electro-hydraulic proportional multi-way valve of a kind of modular load of the embodiment of the present invention, comprising:
Load-sensitive modular pressure 1, described load-sensitive modular pressure 1 is for controlling the oil sources of the responsive electro-hydraulic proportional multi-way valve of whole modular load, as shown in Figure 2, it comprises relief valve 11, #1 throttle valve 13, #2 stop valve 14 and the first pilot-type relief valve 12, the filler opening of described relief valve 11 is connected in parallel to respectively P mouth and MP mouth, the external pressure gauge of described MP mouth, the oil outlet of described relief valve is connected in parallel to T mouth, the filler opening of described the first pilot-type relief valve is connected with the filler opening of described relief valve by #1 throttle valve, the filler opening of described the first pilot-type relief valve is connected in parallel to LS mouth by #2 stop valve, the oil outlet of described the first pilot-type relief valve is connected in parallel to the oil outlet of described relief valve, Z mouth is for external control oil sources, when external oil sources is load-reacting pump, described #1 throttle valve is communicated with described #2 stop valve simultaneously to be blocked, LS mouth is connected with the load-sensitive mouth of variable displacement pump, P mouth is connected with the pressure hydraulic fluid port of described variable displacement pump, T mouth is connected with oil return system, T1Kou Wei unloading port and being connected with oil sump tank, when external oil sources is load-sensitive metering pump, described #1 throttle valve blocks simultaneously described #2 stop valve and is communicated with, described LS mouth blocks, the stopper that can install additional in the middle of described LS oil circuit and T1 oil circuit with throttle orifice fluctuates to reduce system pressure, the maximum that flow in described the first pilot-type relief valve is whole valve set system, by flow, by different damping is installed, can realize the conversion between variable displacement pump load sensitive system and metering pump load sensitive system, LS ', P ' in this load-sensitive modular pressure 1, T ', T1 ' and Z ' hydraulic fluid port respectively andlogic control module are connected, and A, the P in described load-sensitive modular pressure 1, T are connected with proportional control valve pilot control module 2 respectively with B hydraulic fluid port,
Proportional control valve pilot control module 2, described proportional control valve pilot control module 2 is controlled oil sources with external pilot and is connected for providing pilot control to the responsive electro-hydraulic proportional multi-way valve of described modular load, the A mouth of described proportional control valve pilot control module is connected in parallel to Z mouth, T mouth is connected in parallel to T1 mouth, and B mouth is connected in parallel to LS mouth for detection of the total LS feedback pressure of the responsive electro-hydraulic proportional multi-way valve of described modular load; As shown in Figure 3, in Fig. 3, a is cover plate, be connected with described load-sensitive modular pressure 1, in Fig. 3, b is the guide that the adds fixed filter oil circuit module that reduces pressure, can provide pilot control for the responsive electro-hydraulic proportional multi-way valve of this modular load, in Fig. 3, c is an outer oil supply source decompression oil circuit module, can provide extraordinary pressure oil-source for brake waits;
Logic control module, described Logic control module comprises a plurality of proportional control valves, described a plurality of proportional control valve is the first proportional control valve 301 and the second proportional control valve 302, described the first proportional control valve 301 and described the second proportional control valve 302 include the second pilot-type relief valve, LS shuttle valve and two logical pressure-compensated valves, described two logical pressure-compensated valves are for keeping invariable at induced pressure or charge oil pressure variation Shi Shi actuator flow, the filler opening of described two logical pressure-compensated valves is connected in parallel to P mouth, in described the first proportional control valve, the return opening of LS shuttle valve is connected in LS mouth, in described the second proportional control valve, the return opening of LS shuttle valve is connected in a filler opening of LS shuttle valve in the first proportional control valve, one hydraulic fluid port of described two logical pressure-compensated valves, one filler opening of the filler opening of described the second pilot-type relief valve and LS shuttle valve is in parallel, the return opening of described the second pilot-type relief valve is connected in parallel to T1 mouth, in described the second proportional control valve, a filler opening of LS shuttle valve is connected in LS mouth, LS mouth on described Logic control module can be loaded onto pressure gauge for detection of the real-time maximum pressure in this control module loop, and while and the second pilot-type relief valve coordinate the highest pressure limiting that regulates this loop,
Proportion pilot control module, described proportion pilot control module comprises a plurality of proportion pilot control valves, described a plurality of proportional control valve is the first proportion pilot control valve 501 and the second proportion pilot control valve 502, a kind of in hydraulic control proportion pilot control valve or automatically controlled proportion pilot control valve of described the first proportion pilot control valve 501 and described the second proportion pilot control valve 502, described hydraulic control proportion pilot control valve and automatically controlled proportion pilot control valve exchange as required, installation dimension is the same, has improved the interchangeability of this multi-way valve;
Ratio inverting module, described ratio inverting module comprises hydraulic control guide proportion selector valve or the solenoid-operated proportional selector valve with described Logic control module respective amount, described ratio inverting module specifically can comprise the first hydraulic control proportional reversing valve 401 and the second hydraulic control proportional reversing valve 402, the a mouth of described the first proportion pilot control module 501 is connected with the left pilot port of described the first hydraulic control proportional reversing valve 401, the b mouth of described the first proportion pilot control module 501 is connected with the right pilot port of described the first hydraulic control proportional reversing valve 401, the a mouth of described the second proportion pilot control module 502 is connected with the left pilot port of described the second hydraulic control proportional reversing valve 402, the b mouth of described the second proportion pilot control module 502 is connected with the right pilot port of described the second hydraulic control proportional reversing valve 402, two hydraulic fluid ports of described the first hydraulic control proportional reversing valve 401 are connected with T mouth and T1 mouth respectively, a hydraulic fluid port of described the first hydraulic control proportional reversing valve 401 is connected with the return opening of described two logical pressure-compensated valves, by the electric ratio of left pilot port and right pilot port or manual liquid proportional are controlled, to realize P mouth and control to the proportional flow commutation of A mouth or B mouth, pilot pressure is 5bar～18bar,
A plurality of major loop functional control modules, described a plurality of major loop control module is the first major loop control module 601 and the second major loop control module 602, two hydraulic fluid ports of described the first major loop control module 601 are connected in parallel to respectively T mouth, two hydraulic fluid ports of described the second major loop control module 602 are connected in parallel to respectively T mouth, the A1 mouth of described the first major loop control module is connected with two hydraulic fluid ports of described the first hydraulic control proportional reversing valve respectively with B1 mouth, the A2 mouth of described the second major loop control module is connected with two hydraulic fluid ports of described the second hydraulic control proportional reversing valve respectively with B2 mouth, as shown in Figure 4, in figure, a is theory diagram, wherein A mouth is seen directly and is connected with driving element with B mouth, in figure, b for installing the theory diagram of overload valve additional on major loop, in figure, c for installing the theory diagram of hole valve additional in major loop, in figure, d, for install the theory diagram of two equilibrium valves additional in major loop, can also install the control valves such as Pilot operated check valve additional in addition, and
Connect and interconnecting module 7, described connection and interconnecting module comprise valve and for the changeover valve piece of the different latus rectum valve groups of transferring, when differing larger, front and back valve group flow carries out transition by described changeover valve piece, by described P mouth, T mouth, LS mouth, T1 mouth and Z mouth are transitioned into rear valve piece group, as shown in Figure 5, in figure, a is cover plate theory diagram, in figure, b is the changeover valve piece of different latus rectum valve groups, when differing larger, front and back valve group flow just can carry out transition by changeover valve piece, by P, T, LS, TI and Z mouth are transitioned into valve group below, the approaching valve group of flow can be without changeover valve piece, can realize switching by auxiliary hole.
Preferred implementation as above-described embodiment, described load-sensitive modular pressure, proportional control valve pilot control module, Logic control module, ratio inverting module, proportion pilot control module, major loop functional control module and connection and interconnecting module become one.
As the preferred implementation of above-described embodiment, described T mouth comprises a T mouth and the 2nd T mouth, and a described T mouth is for conventional, and described the 2nd T mouth is for standby.
As the preferred implementation of above-described embodiment, described P mouth comprises a P mouth and the 2nd P mouth, and a described P mouth is for conventional, and described the 2nd P mouth is for standby.
Finally it should be noted that: above-described each embodiment, only for technological scheme of the present invention is described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technological scheme that still can record previous embodiment is modified, or to wherein partly or entirely technical characteristics be equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technological scheme.
Claims (4)
1. the responsive electro-hydraulic proportional multi-way valve of modular load, is characterized in that, comprising:
Load-sensitive modular pressure, described load-sensitive modular pressure is for controlling the oil sources of the responsive electro-hydraulic proportional multi-way valve of whole modular load, it comprises relief valve, #1 throttle valve, #2 stop valve and the first pilot-type relief valve, the filler opening of described relief valve is connected in parallel to respectively P mouth and MP mouth, the external pressure gauge of described MP mouth, the oil outlet of described relief valve is connected in parallel to T mouth, the filler opening of described the first pilot-type relief valve is connected with the filler opening of described relief valve by #1 throttle valve, the filler opening of described the first pilot-type relief valve is connected in parallel to LS mouth by #2 stop valve, the oil outlet of described the first pilot-type relief valve is connected in parallel to the oil outlet of described relief valve, Z mouth is for external control oil sources, when external oil sources is load-reacting pump, described #1 throttle valve is communicated with described #2 stop valve simultaneously to be blocked, LS mouth is connected with the load-sensitive mouth of variable displacement pump, P mouth is connected with the pressure hydraulic fluid port of described variable displacement pump, T mouth is connected with oil return system, T1Kou Wei unloading port and being connected with oil sump tank, when external oil sources is load-sensitive metering pump, described #1 throttle valve blocks simultaneously described #2 stop valve and is communicated with, described LS mouth blocks,
Proportional control valve pilot control module, described proportional control valve pilot control module is controlled oil sources with external pilot and is connected for providing pilot control to the responsive electro-hydraulic proportional multi-way valve of described modular load, the A mouth of described proportional control valve pilot control module is connected in parallel to Z mouth, T mouth is connected in parallel to T1 mouth, and B mouth is connected in parallel to LS mouth for detection of the total LS feedback pressure of the responsive electro-hydraulic proportional multi-way valve of described modular load;
Logic control module, described Logic control module comprises a plurality of logic control valves, described a plurality of logic control valve is two proportional control valves, described two proportional control valves are the first proportional control valve and the second proportional control valve and include the second pilot-type relief valve, LS shuttle valve and two logical pressure-compensated valves, described two logical pressure-compensated valves are for keeping invariable at induced pressure or charge oil pressure variation Shi Shi actuator flow, the filler opening of described two logical pressure-compensated valves is connected in parallel to P mouth, in described the first proportional control valve, the return opening of LS shuttle valve is connected in LS mouth, in described the second proportional control valve, the return opening of LS shuttle valve is connected in a filler opening of LS shuttle valve in the first proportional control valve, one hydraulic fluid port of described two logical pressure-compensated valves, one filler opening of the filler opening of described the second pilot-type relief valve and LS shuttle valve is in parallel, the return opening of described the second pilot-type relief valve is connected in parallel to T1 mouth, in described the second proportional control valve, a filler opening of LS shuttle valve is connected in LS mouth,
Proportion pilot control module, described proportion pilot control module comprises a plurality of proportion pilot control valves, described a plurality of proportion pilot control valve is the first proportion pilot control valve and the second proportion pilot control valve, described the first proportion pilot control valve and described the second proportion pilot control valve are a kind of in hydraulic control proportion pilot control valve or automatically controlled proportion pilot control valve, and described hydraulic control proportion pilot control valve and automatically controlled proportion pilot control valve exchange as required;
Ratio inverting module, described ratio inverting module comprises hydraulic control guide proportion selector valve or the solenoid-operated proportional selector valve with the corresponding quantity of described Logic control module, comprise the first hydraulic control proportional reversing valve and the second hydraulic control proportional reversing valve, the a mouth of described the first proportion pilot control module is connected with the left pilot port of described the first hydraulic control proportional reversing valve, the b mouth of described the first proportion pilot control module is connected with the right pilot port of described the first hydraulic control proportional reversing valve, the a mouth of described the second proportion pilot control module is connected with the left pilot port of described the second hydraulic control proportional reversing valve, the b mouth of described the second proportion pilot control module is connected with the right pilot port of described the second hydraulic control proportional reversing valve, described the first hydraulic control proportional reversing valve two each and every one hydraulic fluid ports are connected with T mouth and T1 mouth respectively, a hydraulic fluid port of described the first hydraulic control proportional reversing valve is connected with the return opening of described two logical pressure-compensated valves,
A plurality of major loop functional control modules, described a plurality of major loop control module is the first major loop control module and the second major loop control module, two hydraulic fluid ports of described the first major loop control module are connected in parallel to respectively T mouth, two hydraulic fluid ports of described the second major loop control module are connected in parallel to respectively T mouth, the A1 mouth of described the first major loop control module is connected with two hydraulic fluid ports of described the first hydraulic control proportional reversing valve respectively with B1 mouth, and the A2 mouth of described the second major loop control module is connected with two hydraulic fluid ports of described the second hydraulic control proportional reversing valve respectively with B2 mouth; And
Connect and interconnecting module, described connection and interconnecting module comprise valve and for the changeover valve piece of the different latus rectum valve groups of transferring, when front and back valve group flow differs larger, by described changeover valve piece, carry out transition, described P mouth, T mouth, LS mouth, T1 mouth and Z mouth are transitioned into rear valve piece group.
2. the responsive electro-hydraulic proportional multi-way valve of modular load according to claim 1, it is characterized in that, described load-sensitive modular pressure, proportional control valve pilot control module, Logic control module, ratio inverting module, proportion pilot control module, major loop functional control module and connection and interconnecting module become one.
3. the responsive electro-hydraulic proportional multi-way valve of modular load according to claim 1, is characterized in that, described T mouth comprises a T mouth and the 2nd T mouth, and a described T mouth is for conventional, and described the 2nd T mouth is for standby.
4. the responsive electro-hydraulic proportional multi-way valve of modular load according to claim 1, is characterized in that, described P mouth comprises a P mouth and the 2nd P mouth, and a described P mouth is for conventional, and described the 2nd P mouth is for standby.
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| CN201410377260.0A CN104179743B (en) | 2014-08-04 | 2014-08-04 | Modular load sensitivity electric-hydraulic proportion banked direction control valves |
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| CN201410377260.0A CN104179743B (en) | 2014-08-04 | 2014-08-04 | Modular load sensitivity electric-hydraulic proportion banked direction control valves |
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Cited By (4)
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| CN107762995A (en) * | 2017-09-13 | 2018-03-06 | 江苏恒立液压科技有限公司 | Novel electric proportional overflow device |
| CN108412829A (en) * | 2018-04-09 | 2018-08-17 | 徐州燕大传动与控制技术有限公司 | A kind of separately adjustable load-sensitive formula multi-way valve of inlet and outlet throttling side energy |
| CN114263644A (en) * | 2021-12-27 | 2022-04-01 | 徐工集团工程机械股份有限公司道路机械分公司 | Oil supply control valve group for steering gear |
| CN115681262A (en) * | 2022-10-27 | 2023-02-03 | 华东交通大学 | Load-sensitive electro-hydraulic conversion oil inlet module |
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| CN108412829B (en) * | 2018-04-09 | 2022-02-11 | 徐州燕大传动与控制技术有限公司 | Load sensitive type multi-way valve with independently adjustable inlet and outlet throttling edges |
| CN114263644A (en) * | 2021-12-27 | 2022-04-01 | 徐工集团工程机械股份有限公司道路机械分公司 | Oil supply control valve group for steering gear |
| CN114263644B (en) * | 2021-12-27 | 2024-02-27 | 徐工集团工程机械股份有限公司道路机械分公司 | Oil supply control valve group for steering gear |
| CN115681262A (en) * | 2022-10-27 | 2023-02-03 | 华东交通大学 | Load-sensitive electro-hydraulic conversion oil inlet module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104179743B (en) | 2017-09-26 |
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Effective date of registration: 20180717 Address after: 075300 jade belt industrial park, lower Garden District, Zhangjiakou, Hebei Patentee after: Zhangjiakou Kangxi Machinery Co., Ltd. Address before: 100039 room 235237, Fuxing office 59-2, Central Road, Haidian District, Beijing. Patentee before: BEIJING AB RUILI ELECTROHYDRAULIC EQUIPMENT CO., LTD. |