阅读说明：本技术 一种主阀带位移传感器和放大器的比例换向阀 (Proportional reversing valve with displacement sensor and amplifier for main valve ) 是由 黄建林 崔剑 钱根发 朱剑根 马欲宏 金丹 谷文平 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种主阀带位移传感器和放大器的比例换向阀,包括阀体组件,放大器组件,位移传感器和直动比例换向阀；所述放大器组件与直动比例换向阀组件进行驱动连接,驱动直动比例换向阀组件进行第一方向的移动呈第一工作状态,当直动比例换向阀为第一工作状态时与阀体组件的第二端面进行联通；当液压力在阀体组件的第二端面时,所述阀体组件则进行第一方向的移动；所述位移传感器设置于阀体组件内,将阀体组件位置移动信号发送给放大器组件,再反馈给待配合的外部控制系统,通过位置信号来指令放大器组件对阀体组件移动距离的调整。(The invention discloses a proportional reversing valve with a displacement sensor and an amplifier on a main valve, which comprises a valve body assembly, an amplifier assembly, a displacement sensor and a direct-acting proportional reversing valve; the amplifier assembly is in driving connection with the direct-acting proportional reversing valve assembly, drives the direct-acting proportional reversing valve assembly to move in a first direction to be in a first working state, and is communicated with the second end face of the valve body assembly when the direct-acting proportional reversing valve is in the first working state; when hydraulic pressure is at the second end face of the valve body assembly, the valve body assembly moves in a first direction; the displacement sensor is arranged in the valve body assembly, sends a position moving signal of the valve body assembly to the amplifier assembly, feeds back the position moving signal to an external control system to be matched, and instructs the amplifier assembly to adjust the moving distance of the valve body assembly through the position signal.)

1. A proportional reversing valve with a displacement sensor and an amplifier on a main valve is characterized by comprising a valve body assembly, an amplifier assembly, a displacement sensor and a direct-acting proportional reversing valve; the amplifier assembly is in driving connection with the direct-acting proportional reversing valve assembly, drives the direct-acting proportional reversing valve assembly to move in a first direction to be in a first working state, and is communicated with the second end face of the valve body assembly when the direct-acting proportional reversing valve is in the first working state; when hydraulic pressure is at the second end face of the valve body assembly, the valve body assembly moves in a first direction; the displacement sensor is arranged in the valve body assembly, sends a position moving signal of the valve body assembly to the amplifier assembly, feeds back the position moving signal to an external control system to be matched, and instructs the amplifier assembly to adjust the moving distance of the valve body assembly through the position signal.

2. The proportional reversing valve with displacement sensor and amplifier of claim 1, wherein said valve body assembly comprises a main valve body, a main spool, a first cover plate, a second cover plate; the sensor comprises a spring, a first spring seat, a second spring seat, an adjusting screw and a sensor core rod; the spring is arranged between the first spring seat and the second spring seat and is integrally arranged at one end of the main valve core through an adjusting screw; the adjusting screw can adjust the distance between the first spring seat and the second spring seat; the sensor core rod is connected with the other end of the main valve core and is in signal connection with the displacement sensor; the main valve core is arranged in an inner hole of the main valve body; the first cover plate and the second cover plate are respectively arranged at two ends of the main valve body; the main valve core can drive the adjusting screw, the first spring seat and the second spring seat to overcome spring force to move in a first direction, and meanwhile, the sensor core rod transmits a position signal for detecting the movement of the main valve core to the displacement sensor.

3. The proportional reversing valve with displacement sensor and amplifier for main valve according to claim 2, wherein said main valve body is distributed with an oil inlet chamber, a first oil outlet chamber, a second oil outlet chamber, a first oil return chamber, a second oil return chamber, an oil inlet, a first oil outlet, a second oil outlet, and an oil return port; the first oil return cavity is communicated with the second oil return cavity through the inner flow channel; the oil inlet cavity is communicated with an oil inlet at the bottom surface, and the first oil outlet cavity is communicated with a first oil outlet at the bottom surface of the main valve body; the second oil outlet cavity is communicated with a second oil outlet at the bottom surface of the main valve body; the first oil return cavity and the second oil return cavity are communicated with an oil return port on the bottom surface of the main valve body;

the main valve body is also provided with a first inclined hole, a first control oil outlet hole, a second inclined hole, a second control oil outlet hole, a control oil inlet hole, a first process hole, a control oil return hole and a second process hole; a first inclined hole on the front end surface of the main valve body leads to a first control oil outlet hole on the top surface of the main valve body; a second inclined hole on the rear end surface of the main valve body leads to a second control oil outlet hole on the top surface of the main valve body; the control oil inlet hole on the top surface of the main valve body is communicated with the first process hole; the control oil return hole on the top surface of the main valve body is communicated with the second fabrication hole;

the main valve body also comprises an internal and external control conversion hole, an internal and external control conversion plug, a first process plug, a second process plug, a third process hole, an internal and external row conversion hole, a third process plug and a fourth process plug;

the internal and external control conversion hole is communicated with the first process hole and the oil inlet cavity; the internal and external control conversion plug is arranged in the internal and external control conversion hole for controlling oil to be externally controlled, and the control oil only enters from the control oil inlet; the internal control conversion plug is not installed, the control oil is obtained from the oil inlet cavity, and the first process plug and the second process plug respectively plug the first process hole and the internal control conversion hole;

the third process hole is communicated with the inner and outer row of conversion holes through the second process hole; the third process plug, the fourth process plug and the fifth process plug respectively plug the second process hole, the third process hole and the inner and outer row conversion holes;

the inner and outer row conversion plug is arranged in the inner and outer row conversion hole to realize the conversion of the inner and outer rows of control oil, and the discharged control oil enters the inner flow channel through the inner and outer row conversion hole and then returns to the oil tank without the inner and outer row conversion plug; when the internal and external row conversion plug is installed, the discharged control oil flows to the control oil discharge port through the third process hole and then returns to the oil tank.

4. A proportional reversing valve having a main valve with a displacement sensor and amplifier according to claim 2, wherein said main valve spool is movably mounted in the main bore of the main valve body, and has a plurality of grooves and flow restricting grooves cut along the outer circumference of the spool body;

the groove is a long arc-shaped groove, a plurality of grooves are symmetrically arranged at two positions on the first end of the main valve core, each long arc-shaped groove is formed by combining grooves with different depths and radiuses, the radius of the shallow groove is slightly larger than that of the deep groove, and the long arc-shaped groove is provided with a straight edge and extends into the groove;

the groove is a short arc-shaped groove, a plurality of grooves are symmetrically arranged at two positions on the other end of the main valve core, each short arc-shaped groove is formed by combining grooves with different depths and radii, the radius of the shallow groove is slightly larger than that of the deep groove, and no straight edge exists;

the groove is a small throttling groove, a plurality of small throttling grooves are symmetrically arranged on the main valve core at two positions, and the small throttling grooves are long strips with circular arcs at two ends and straight edges;

the groove is an anti-rotation groove; the anti-rotation groove is an arc at one end and a strip-shaped groove with an opening at one end, and is provided with a square rotation screw for use, and the square rotation screw is matched with the anti-rotation screw, so that the main valve core can be prevented from rotating through the clamping of the anti-rotation screw and the anti-rotation groove, and the main valve core is prevented from being abraded seriously.

5. The proportional reversing valve with displacement sensor and amplifier for main valve according to claim 1, wherein said direct-acting proportional reversing valve is connected with an electrical component; the electrical assembly includes a first housing. A second housing, an amplifier output cable assembly; the first shell is arranged inside the rear cover; the second shell is connected with the first shell; the amplifier output cable assembly is arranged on the first shell and is an access port for an external power supply and a control signal; the amplifier output cable assembly comprises two waterproof plugs, two groups of sheath wires and two plugs; one end of each of the two amplifier output cables is connected with the first shell through a waterproof plug, and the other end of each of the two amplifier output cables is connected with the plug; the sheath wire is sleeved on the output cable of the amplifier.

6. The proportional reversing valve with displacement sensor and amplifier for main valve according to claim 1, wherein said amplifier assembly is disposed inside the first housing of the electrical assembly and is connected to the amplifier output cable assembly and the displacement sensor, respectively; the amplifier assembly consists of an integrated circuit board, a heat dissipation plate, a plurality of power MOS tubes and a capacitor; the integrated circuit board is connected with the heat dissipation plate; the power MOS tubes are symmetrically arranged on the heat dissipation plate; the top surface of the capacitor is connected with the heat dissipation plate.

7. The proportional reversing valve with a main valve provided with a displacement sensor and an amplifier according to claim 1, wherein the displacement sensor is arranged inside an electrical assembly, and comprises a shell and a coil; the sensor is connected with the inner part of the back cover through the sensor shell and the back cover; the sensor comprises a sensor shell, a sensor core rod and a sensor core rod, wherein the sensor shell is detachably provided with a coil, and the sensor shell is connected with the sensor core rod in a matched mode and used for converting position data signals of the sensor core rod into electric signals.

8. The proportional reversing valve with displacement sensor and amplifier as claimed in claim 1, wherein an adapter plate is provided between said main valve body and said constant pressure reducing valve; the bottom surface of the adapter plate is the installation size of the 10-path reversing valve, and the top surface of the adapter plate is the installation size of the 6-path reversing valve, so that the transition conversion function of the 10-path size and the 6-path size is realized;

an upper pilot oil inlet, a lower pilot oil inlet, a first upper pilot oil outlet, a second upper pilot oil outlet, a first lower pilot oil outlet, a second lower pilot oil outlet, an upper pilot oil return port and a lower pilot oil return port are distributed on the adapter plate; the upper pilot oil inlet on the top surface of the adapter plate is communicated with the lower pilot oil inlet on the bottom surface; the first upper pilot oil outlet and the second upper pilot oil outlet are communicated with a first lower pilot oil outlet and a second lower pilot oil outlet respectively; and the upper pilot oil return port is communicated with the lower pilot oil return port.

9. The proportional reversing valve with a displacement sensor and an amplifier for a main valve as claimed in claim 1, wherein said adapter plate is provided with a constant pressure reducing valve for reducing pressure of hydraulic oil flowing into the main valve body.

10. The proportional reversing valve with displacement sensor and amplifier for main valve according to claim 1, wherein said direct acting proportional reversing valve comprises a valve body, a valve core; a main hole is formed in the valve body 910, and is distributed with an oil inlet cavity, a first oil outlet cavity, a second oil outlet cavity, a first oil return cavity and a second oil return cavity, wherein an inner flow channel connects the first oil return cavity with the second oil return cavity;

a main hole in the valve body is provided with a valve core; the excircle of the valve core is provided with a groove which is combined with each oil cavity of the valve body to realize the required oil path trend; the eccentric perforation is arranged in the valve core, so that oil at the left end and the right end can freely flow without causing pressure build-up when the valve core moves in a reversing way;

both ends of the valve core are provided with a spring and a check ring; proportional electromagnets are arranged at two ends of a main hole of the valve body;

the proportional electromagnet consists of an iron core, a coil, a push rod and a nut; the iron core is provided with threads which are arranged at two ends of a main hole of the valve body; the coil is sleeved on the iron core and fixed; the push rod is arranged in the middle of the iron core and used for pushing the iron core to move.

Technical Field

The invention relates to the technical field of machine manufacturing, in particular to a proportional reversing valve with a displacement sensor and an amplifier for a main valve.

Background

In many high-precision hydraulic control situations, proportional reversing valves are often required. The proportional reversing valve herein often plays a core role, directly affecting the performance of the equipment and the quality of the produced product.

The existing proportional reversing valve generally adopts a double-spring structure, and the double-spring structure has high requirement on symmetry and large precompression.

The direct-acting proportional reversing valve on the top of the main valve is generally in a 6-diameter specification, and when the specification of the main valve is large and the action response is required to be fast, the control flow cannot keep up.

In addition, the integrated amplifier in the existing proportional reversing valve is generally arranged on the top of the direct-acting proportional reversing valve, and the overall dimension, particularly the height dimension, is larger, so that more space is occupied.

Therefore, how to improve the performance of the proportional reversing valve is a problem to be solved in the field.

Disclosure of Invention

Aiming at the technical problem of low performance of the existing proportional reversing valve, the invention aims to provide the proportional reversing valve with the main valve provided with the displacement sensor and the amplifier, the displacement sensor and the amplifier are placed in the valve body to save space, and the reversing valve in the scheme can be used by switching between 10 drift diameters and 6 drift diameters, so that the performance of the proportional reversing valve is greatly improved, and the problems in the prior art are well overcome.

In order to achieve the purpose, the proportional reversing valve with the displacement sensor and the amplifier on the main valve comprises a valve body assembly, an amplifier assembly, a displacement sensor and a direct-acting proportional reversing valve; the amplifier assembly is in driving connection with the direct-acting proportional reversing valve assembly, drives the direct-acting proportional reversing valve assembly to move in a first direction to be in a first working state, and is communicated with the second end face of the valve body assembly when the direct-acting proportional reversing valve is in the first working state; when hydraulic pressure is at the second end face of the valve body assembly, the valve body assembly moves in a first direction; the displacement sensor is arranged in the valve body assembly, sends a position moving signal of the valve body assembly to the amplifier assembly, feeds back the position moving signal to an external control system to be matched, and instructs the amplifier assembly to adjust the moving distance of the valve body assembly through the position signal.

Further, the valve body assembly comprises a main valve body, a main valve core, a first cover plate and a second cover plate; the sensor comprises a spring, a first spring seat, a second spring seat, an adjusting screw and a sensor core rod; the spring is arranged between the first spring seat and the second spring seat and is integrally arranged at one end of the main valve core through an adjusting screw; the adjusting screw can adjust the distance between the first spring seat and the second spring seat; the sensor core rod is connected with the other end of the main valve core and is in signal connection with the displacement sensor; the main valve core is arranged in an inner hole of the main valve body; the first cover plate and the second cover plate are respectively arranged at two ends of the main valve body; the main valve core can drive the adjusting screw, the first spring seat and the second spring seat to overcome spring force to move in a first direction, and meanwhile, the sensor core rod transmits a position signal for detecting the movement of the main valve core to the displacement sensor.

Furthermore, the main valve body is distributed with an oil inlet cavity, a first oil outlet cavity, a second oil outlet cavity, a first oil return cavity, a second oil return cavity, an oil inlet, a first oil outlet, a second oil outlet and an oil return port; the first oil return cavity is communicated with the second oil return cavity through the inner flow channel; the oil inlet cavity is communicated with an oil inlet at the bottom surface, and the first oil outlet cavity is communicated with a first oil outlet at the bottom surface of the main valve body; the second oil outlet cavity is communicated with a second oil outlet at the bottom surface of the main valve body; the first oil return cavity and the second oil return cavity are communicated with an oil return port on the bottom surface of the main valve body;

the main valve body is also provided with a first inclined hole, a first control oil outlet hole, a second inclined hole, a second control oil outlet hole, a control oil inlet hole, a first process hole, a control oil return hole and a second process hole; a first inclined hole on the front end surface of the main valve body leads to a first control oil outlet hole on the top surface of the main valve body; a second inclined hole on the rear end surface of the main valve body leads to a second control oil outlet hole on the top surface of the main valve body; the control oil inlet hole on the top surface of the main valve body is communicated with the first process hole; the control oil return hole on the top surface of the main valve body is communicated with the second fabrication hole;

the main valve body also comprises an internal and external control conversion hole, an internal and external control conversion plug, a first process plug, a second process plug, a third process hole, an internal and external row conversion hole, a third process plug and a fourth process plug;

the internal and external control conversion hole is communicated with the first process hole and the oil inlet cavity; the internal and external control conversion plug is arranged in the internal and external control conversion hole for controlling oil to be externally controlled, and the control oil only enters from the control oil inlet; the internal control conversion plug is not installed, the control oil is obtained from the oil inlet cavity, and the first process plug and the second process plug respectively plug the first process hole and the internal control conversion hole;

the third process hole is communicated with the inner and outer row of conversion holes through the second process hole; the third process plug, the fourth process plug and the fifth process plug respectively plug the second process hole, the third process hole and the inner and outer row conversion holes;

the inner and outer row conversion plug is arranged in the inner and outer row conversion hole to realize the conversion of the inner and outer rows of control oil, and the discharged control oil enters the inner flow channel through the inner and outer row conversion hole and then returns to the oil tank without the inner and outer row conversion plug; when the internal and external row conversion plug is installed, the discharged control oil flows to the control oil discharge port through the third process hole and then returns to the oil tank.

Furthermore, the main valve core is movably arranged in a main hole of the main valve body, and a plurality of grooves and grooves for limiting flow are cut along the excircle of the valve core body;

the groove is a long arc-shaped groove, a plurality of grooves are symmetrically arranged at two positions on the first end of the main valve core, each long arc-shaped groove is formed by combining grooves with different depths and radiuses, the radius of the shallow groove is slightly larger than that of the deep groove, and the long arc-shaped groove is provided with a straight edge and extends into the groove;

the groove is a short arc-shaped groove, a plurality of grooves are symmetrically arranged at two positions on the other end of the main valve core, each short arc-shaped groove is formed by combining grooves with different depths and radii, the radius of the shallow groove is slightly larger than that of the deep groove, and no straight edge exists;

the groove is a small throttling groove, a plurality of small throttling grooves are symmetrically arranged on the main valve core at two positions, and the small throttling grooves are long strips with circular arcs at two ends and straight edges;

the groove is an anti-rotation groove; the anti-rotation groove is an arc at one end and a strip-shaped groove with an opening at one end, and is provided with a square rotation screw for use, and the square rotation screw is matched with the anti-rotation screw, so that the main valve core can be prevented from rotating through the clamping of the anti-rotation screw and the anti-rotation groove, and the main valve core is prevented from being abraded seriously.

Furthermore, the direct-acting proportional reversing valve is connected with an electrical component; the electrical assembly includes a first housing. A second housing, an amplifier output cable assembly; the first shell is arranged inside the rear cover; the second shell is connected with the first shell; the amplifier output cable assembly is arranged on the first shell and is an access port for an external power supply and a control signal; the amplifier output cable assembly comprises two waterproof plugs, two groups of sheath wires and two plugs; one end of each of the two amplifier output cables is connected with the first shell through a waterproof plug, and the other end of each of the two amplifier output cables is connected with the plug; the sheath wire is sleeved on the output cable of the amplifier.

Furthermore, the amplifier assembly is arranged in the first shell of the electrical assembly and is respectively connected with the amplifier output cable assembly and the displacement sensor; the amplifier assembly consists of an integrated circuit board, a heat dissipation plate, a plurality of power MOS tubes and a capacitor; the integrated circuit board is connected with the heat dissipation plate; the power MOS tubes are symmetrically arranged on the heat dissipation plate; the top surface of the capacitor is connected with the heat dissipation plate.

Further, the displacement sensor is arranged inside the electrical component and comprises a shell and a coil; the sensor is connected with the inner part of the back cover through the sensor shell and the back cover; the sensor comprises a sensor shell, a sensor core rod and a sensor core rod, wherein the sensor shell is detachably provided with a coil, and the sensor shell is connected with the sensor core rod in a matched mode and used for converting position data signals of the sensor core rod into electric signals.

Furthermore, an adapter plate is arranged between the main valve body and the constant value pressure reducing valve; the bottom surface of the adapter plate is the installation size of the 10-path reversing valve, and the top surface of the adapter plate is the installation size of the 6-path reversing valve, so that the transition conversion function of the 10-path size and the 6-path size is realized;

an upper pilot oil inlet, a lower pilot oil inlet, a first upper pilot oil outlet, a second upper pilot oil outlet, a first lower pilot oil outlet, a second lower pilot oil outlet, an upper pilot oil return port and a lower pilot oil return port are distributed on the adapter plate; the upper pilot oil inlet on the top surface of the adapter plate is communicated with the lower pilot oil inlet on the bottom surface; the first upper pilot oil outlet and the second upper pilot oil outlet are communicated with a first lower pilot oil outlet and a second lower pilot oil outlet respectively; and the upper pilot oil return port is communicated with the lower pilot oil return port.

Furthermore, a fixed value pressure reducing valve is arranged on the adapter plate and used for reducing pressure of hydraulic oil flowing into the main valve body.

Further, the direct-acting proportional reversing valve comprises a valve body and a valve core; a main hole is formed in the valve body 910, and is distributed with an oil inlet cavity, a first oil outlet cavity, a second oil outlet cavity, a first oil return cavity and a second oil return cavity, wherein an inner flow channel connects the first oil return cavity with the second oil return cavity;

a main hole in the valve body is provided with a valve core; the excircle of the valve core is provided with a groove which is combined with each oil cavity of the valve body to realize the required oil path trend; the eccentric perforation is arranged in the valve core, so that oil at the left end and the right end can freely flow without causing pressure build-up when the valve core moves in a reversing way;

both ends of the valve core are provided with a spring and a check ring; proportional electromagnets are arranged at two ends of a main hole of the valve body;

the proportional electromagnet consists of an iron core, a coil, a push rod and a nut; the iron core is provided with threads which are arranged at two ends of a main hole of the valve body; the coil is sleeved on the iron core and fixed; the push rod is arranged in the middle of the iron core and used for pushing the iron core to move.

The main valve area displacement sensor and the proportional reversing valve of amplifier that this scheme provided, it can change the use with 6 latus rectum by 10 latus rectum through placing displacement sensor and amplifier at the inside space-saving of valve body and the reversing valve in this scheme, has improved proportional reversing valve's performance greatly.

Drawings

The invention is further described below in conjunction with the appended drawings and the detailed description.

FIG. 1 is a cross-sectional view of the present proportional reversing valve structure;

FIG. 2 is a schematic view of the proportional reversing valve configuration of FIG. 1 in the direction A;

FIG. 3 is a schematic view of the proportional reversing valve configuration of FIG. 1 in the direction B;

FIG. 4 is a cross-sectional view F-F of the proportional reversing valve structure of FIG. 2;

FIG. 5 is a sectional view G-G of the proportional reversing valve structure of FIG. 2;

FIG. 6 is a schematic view of the main spool structure of the proportional reversing valve;

FIG. 7 is a cross-sectional view H-H of the main spool structure of FIG. 6;

FIG. 8 is a cross-sectional view L-L of the main spool structure of FIG. 6;

FIG. 9 is a schematic diagram of the electrical components of the proportional reversing valve;

FIG. 10 is a schematic diagram of the amplifier assembly of the electrical assembly of FIG. 9;

FIG. 11 is a schematic view of the amplifier assembly of FIG. 10 in the direction of C;

FIG. 12 is a schematic view of the construction of the transfer plate in the present proportional directional control valve;

FIG. 13 is a schematic view of the adapter plate structure of FIG. 12 in the direction D;

FIG. 14 is a schematic view of the construction of the joint plate of FIG. 12 in the direction E.

The following are labeled descriptions of the components in the drawings:

100. the main valve body 101, the oil inlet cavity 102, the first oil outlet cavity 103, the second oil outlet cavity 104, the first oil return cavity 105, the second oil return cavity 106, the internal flow channel 107, the first inclined hole 108, the first control oil outlet hole 109, the second inclined hole 110, the second control oil outlet hole 111, the control oil inlet hole 112, the control oil return hole 113, the internal and external control conversion hole 114, the third process hole 115, the internal and external discharge conversion hole 116, the oil inlet 117, the first oil outlet 118, the second oil outlet 119, the oil return hole 120, the control oil inlet 121, the control oil outlet 122, the first process hole 123, the second process hole 131, the boss 151, the external control conversion plug 152, the first process plug 153, the second process plug 154, the third process plug 155, the fourth process plug 156, the fifth process plug 157, the internal and external discharge conversion plug 157

200. Main valve plug 201, long arc groove 202, short arc groove 203, small throttle groove 204, anti-rotation groove 205, adjusting screw hole 206, sensor core rod hole 207, core rod fixing hole 251, first spring seat 252, adjusting screw 253, spring 254 and second spring seat

300. Front cover 301, third inclined hole 302, first control oil hole

400. Rear cover 401, fourth inclined hole 402, second control oil hole 410, anti-rotation screw 420 and combined sealing gasket

500. Displacement sensor 501, sensor core rod 502, pressure pipe 503 and sensor shell

600. Electric assembly 601, first shell 602, first screw 603, shell pad 604, second shell 605, second screw 606, amplifier output cable assembly 607, waterproof plug 608, wire sheath 609, plug 650, amplifier assembly 660, integrated circuit board 661, power MOS transistor 662, capacitor 670, heat sink 671, silicone sheet 672, insulating pad 673, pan head screw 674, countersunk screw 675, fixing glue 676, ground terminal

700. Adapter plate 701, upper pilot oil inlet 702, first upper pilot oil outlet 703, second upper pilot oil outlet 704, upper pilot oil return 705, lower pilot oil inlet 706, first lower pilot oil outlet 707, second lower pilot oil outlet 708, and lower pilot oil return

800. Constant value pressure reducing valve

900. Direct-acting proportional reversing valve 910, valve body 911, oil inlet chamber 912, first oil outlet chamber 913, second oil outlet chamber 914, first oil return chamber 915, second oil return chamber 916, inner flow passage 920, valve core 921, eccentric through hole 931, spring 932, retainer ring 950, proportional electromagnet 951, iron core 952, coil 953, push rod 954, nut 954

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

The proportional reversing valve with the displacement sensor and the amplifier on the main valve comprises a main valve body 100, a main valve core 200, a front cover 300, a rear cover 400, a displacement sensor 500, an electrical assembly 600, an adapter plate 700, a fixed value reducing valve 800 and a direct-acting proportional reversing valve 900.

Referring to fig. 1-3, the main valve body 100 has a main hole therein, and is distributed with an oil inlet cavity 101, a first oil outlet cavity 102, a second oil outlet cavity 103, a first oil return cavity 104, and a second oil return cavity 105; the inner flow passage 106 communicates the first oil return chamber 104 with the second oil return chamber 105.

The boss 131 is arranged inside the oil inlet cavity 101, and in order to prevent hydraulic oil from entering the oil inlet cavity 101, the hydraulic oil rotates clockwise along the oil inlet cavity due to the offset of the oil inlet and drives the main valve element 200 to rotate so as to wear the main valve hole and the main valve element 200, the boss 131 can cause turbulence, damage the rotating potential of the hydraulic oil, and eliminate the rotation phenomenon of the main valve element 200.

The oil inlet cavity 101 is communicated with a bottom surface oil inlet 116, and the first oil outlet cavity 102 is communicated with a first oil outlet 117 on the bottom surface of the main valve body; the second oil outlet cavity 103 is communicated with a second oil outlet 118 on the bottom surface of the main valve body; the first oil return cavity 104 and the second oil return cavity 105 are communicated with an oil return port 119 on the bottom surface of the main valve body.

The front end face of the main valve body 100 is provided with a first inclined hole 107 leading to a first control oil outlet hole 108 on the top face of the main valve body; a second inclined hole 109 is formed in the rear end face of the main valve body and leads to a second control oil outlet hole 110 in the top face of the main valve body; the top surface control oil inlet hole 111 of the main valve body 100 is communicated with the first fabrication hole 122; the main valve body top control oil return hole 112 communicates with the second process hole 123 through other process holes.

Referring to fig. 4-5, the internal and external control conversion hole 113 is communicated with the first process hole 122 and the oil inlet cavity 101; the internal and external control conversion plug 151 is arranged in the internal and external control conversion hole 113 for external control of control oil, and at the moment, the control oil only enters from the control oil inlet 120; the internal control conversion plug 151 is not installed as an internal control, control oil is obtained from the oil inlet cavity 101, and the first process plug 152 and the second process plug 153 respectively plug the first process hole 122 and the internal control conversion hole 113.

The third process hole 114 is communicated with the inner and outer row converting holes 115 through the second process hole 123; the third process plug 154, the fourth process plug 155 and the fifth process plug 156 plug the second process hole 123, the third process hole 114 and the inner and outer row of converting holes 115, respectively.

The inner and outer row conversion plug 157 is arranged in the inner and outer row conversion hole 115 to realize the conversion of the inner and outer rows of control oil, and the discharged control oil enters an inner flow passage through the inner and outer row conversion hole 115 and then returns to the oil tank without the inner and outer row conversion plug 157; when the internal and external row conversion screw plug 157 is installed, the discharged control oil passes through the third fabrication hole 114 to the control oil outlet 121 and then returns to the oil tank.

Referring to fig. 6, main valve element 200 is removably mounted in the main bore of main valve body 100, and 3 grooves and several grooves for restricting flow are cut along the outer circumference of the valve element body:

specifically, the number of the long arc-shaped grooves 201 is 8, the two positions on the main valve element 200 are symmetrical, each long arc-shaped groove 201 is formed by combining grooves with different depths and radii, wherein the radius of the shallow groove is slightly larger than that of the deep groove, and a straight edge extends into the groove.

The number of the short arc-shaped grooves 202 is 8, the two symmetrical positions on the main valve core 200 are provided, each short arc-shaped groove 202 is formed by combining grooves with different depths and radiuses, the radius of the shallow groove is slightly larger than that of the deep groove, and no straight edge exists.

The number of the small throttling grooves 203 is 8 on the main valve element 200 at two symmetrical positions, and the small throttling grooves are long strips with circular arc reinforced edges at two ends.

The anti-rotation groove 204 is a circular arc at one end and a strip-shaped groove with an opening at one end, and is matched with an anti-rotation screw, and the main valve element 200 can be prevented from rotating through the clamping of the anti-rotation screw 410 and the anti-rotation groove, so that the main valve element 200 is prevented from being abraded seriously.

Referring to fig. 7-8, one end of the main valve element 200 is provided with an adjusting screw hole 205 for mounting an adjusting screw 252; the other end of main spool 200 is provided with sensor stem hole 206 for mounting sensor stem 501; and a core rod fixing hole 207 with stepped holes at two ends is also arranged in the vertical direction of the sensor core rod hole, and is used for installing the sensor core rod 501 into the sensor core rod hole, and a pressure rod is extended into the sensor core rod hole from the stepped holes at two ends to press the excircle of the sensor core rod 501 to deform the sensor core rod without falling out of the main valve core 200.

A spring 253 is provided between the first spring seat 251 and the second spring seat 254, and is integrally connected to one end of the main valve body 200 by an adjustment screw 252. The overall length between first spring seat 251 and second spring seat 254 may be adjusted by adjusting screw 252 to ensure that the left end face of main poppet 200 and the left end face counterbore bottom surface of main poppet 100 are aligned, thereby ensuring the home position mounting accuracy of main poppet 200.

The front cover 300 is arranged on the left end face of the main valve body 100, and the bottom surface of the inner hole is attached to the end face of the second spring seat 254; the front cover 300 has a third angled hole 301 and a first control oil hole 302 connecting the inner bore of the front cover to the first angled hole 107 of the main valve body 100.

The rear cover 400 is arranged on the right end face of the main valve body 100, a fourth inclined hole 401 and a second control oil hole 402 are formed in the rear cover 400 to connect an inner hole of the rear cover 400 with the second inclined hole 109 of the main valve body 100, and a small step hole pressure-resistant pipe 502 is arranged on the bottom face of the inner hole of the rear cover 400 and sleeved on the sensor core rod 501 to protect the sensor core rod 501, prevent oil from leaking outwards and resist high pressure.

A screw hole of the rotation-preventing screw 410 is provided below the rear cover 400, and the combined sealing gasket 420 serves to seal the screw hole.

The displacement sensor 500 is disposed inside the electrical component, and includes a housing 503 and a coil; through the sensor housing 503 and the inner part of the back cover 400 and assembled with the back cover 400; the sensor housing 503 is provided with a coil therein, and is connected with the sensor core rod 501 in a matching manner, so as to convert the position data signal of the sensor core rod 501 into an electrical signal.

The coil is of a detachable structure, and can be conveniently detached for maintenance.

Referring to fig. 9-11, electrical assembly 600 includes a first housing 601, a second housing 604, an amplifier output cable assembly 606, and an amplifier assembly 650.

The first housing 601 is assembled with the rear cover 400 by a first screw 602; the housing pad 603 and the second housing 604 are attached to the first housing 601 by a second screw 605.

An amplifier output cable assembly 606 is mounted on the first housing 601 for external power and control signal access.

The amplifier output cable assembly comprises two waterproof plugs 607, two groups of sheath wires 608 and two plugs 609; one end of each of the two amplifier output cables is connected with the first shell 601 through a waterproof plug 607, and the other end of each of the two amplifier output cables is connected with a plug 609; the sheath wire 608 is sleeved on the amplifier output cable for protecting the amplifier output cable.

The first housing 601 is internally provided with a displacement sensor 500 and an amplifier assembly 650; placing the displacement sensor 500 and the amplifier assembly 650 in the first housing 601 of the electrical assembly makes full use of the space of the first housing 601 of the electrical assembly, greatly reducing the footprint. The electrical components may provide the output signal of the amplifier assembly 650 to the direct acting proportional directional valve 900.

The amplifier assembly 650 is used for amplifying an external signal or a signal of the displacement sensor; the power amplifier consists of an integrated circuit board 660, a heat radiation plate 670, 4 power MOS tubes 661 and a capacitor 662; the integrated circuit 660 is connected with the heat dissipation plate 670 through a countersunk screw 674, and most of components on the integrated circuit 660 are dissipated through air.

The 4 power MOS transistors 661 are symmetrically disposed on the integrated circuit board 660, and the 4 power MOS transistors generating more heat need to dissipate heat with the aid of the heat dissipation plate 670 having a larger surface area in addition to dissipating heat with air.

An insulating pad 672 and a silicone sheet 671 with good heat conductivity are arranged between the power MOS tube 661 and the heat dissipation plate 670, and the power MOS tube 661 and the silicone sheet 671 are pressed on the heat dissipation plate 670 by the insulating pad 672 and the pan head screw 673.

The top surface of the capacitor 662 is connected with the heat dissipation plate 670 by the fixing glue 675, so that the capacitor 662 can be prevented from vibrating and loosening; the ground terminal 676 is fixed to the heat sink 670 with a screw and a washer, thereby preventing an electric leakage accident and achieving a safety effect.

The adapter plate 700 is mounted on the main valve body 100 in a stacked manner, and referring to fig. 12-14, the bottom surface of the adapter plate is the mounting size of the 10-path reversing valve, and the top surface of the adapter plate is the mounting size of the 6-path reversing valve, so that the transition conversion function between the 10-path size and the 6-path size is realized.

An upper pilot oil inlet 701 on the top surface of the adapter plate 700 is communicated with a lower pilot oil inlet 705 on the bottom surface; meanwhile, a first upper pilot oil outlet 702 and a second upper pilot oil outlet 703 are respectively communicated with a first lower pilot oil outlet 706 and a second lower pilot oil outlet 707; the upper pilot oil return port 704 communicates with the lower pilot oil return port 708.

The constant pressure reducing valve 800 is mounted on the adapter plate 700 in an overlapping manner, and is used for reducing the pressure of the hydraulic oil from the bottom oil inlet 116 or the control oil inlet 120, so as to avoid the impact on the front main valve cover 300 and the rear main valve cover 400 caused by the overhigh control pressure, thereby preventing the service life from being affected.

The direct-acting proportional reversing valve 900 is used to control the main valve spool 200 to reverse according to the stroke specified by a given signal, so that the flow passing through the main valve is controlled and is positioned at the highest layer of the whole valve.

The direct-acting proportional reversing valve comprises a valve body 910 and a valve core 920; the valve body 910 has a main hole inside, and an oil inlet cavity 911, a first oil outlet cavity 912, a second oil outlet cavity 913, a first oil return cavity 914 and a second oil return cavity 915 are distributed in the main hole, and the first oil return cavity 914 and the second oil return cavity 915 are hooked together by an inner flow channel 916.

A main hole in the valve body is provided with a valve core 920, the outer circle of the valve core is provided with a groove, and the valve core and each oil cavity of the valve body 910 are combined to realize the required oil path trend; an eccentric perforation 921 is arranged in the valve core; when the valve core 920 moves in a reversing way, the oil liquid at the left end and the right end can flow freely without causing pressure build-up.

Both ends of the valve core 920 are provided with a spring 931 and a retainer 932. The proportional electromagnets 950 are installed at both ends of the main hole of the valve body 910.

Proportion electro-magnet 950 comprises iron core 951, coil 952, push rod 953 and nut 954, has the screw thread to adorn the main hole both ends of valve body 910 on the iron core 951, and coil 952 suit is on iron core 951, and is fixed by nut 954 again, and when needs change coil, only need loosen the nut can, push rod 953 is in the middle of the iron core for promote the iron core and remove.

The assembly process of this solution is illustrated below. It should be noted that the following description is only a specific application example of the present solution and is not intended to limit the present solution.

The standby state and the working state of the proportional directional valve are respectively explained as follows:

first, standby state

The control power line and input signal line enter the amplifier assembly 650 via the amplifier output cable assembly, and are powered on but have no input signal, so that the amplifier has no output signal.

And a control oil supply and discharge passage corresponding to the control oil supply and discharge type:

external supply: the internal and external supply conversion plug 151 is blocked, and control oil is obtained from the control oil inlet 120;

internal supply: the external supply conversion plug 151 is not installed, and oil is obtained from the oil inlet cavity 101;

and (3) discharging: the inner and outer rows are blocked by the conversion plug 157, and the control oil flows out from the control oil outlet 121 and returns to the oil tank;

and in the inner row, the inner row and outer row conversion plug 157 is not installed, and the control oil flows out of the inner flow passage 106 through the second oil return cavity 105 and the oil return port 119 and returns to the oil tank.

There are 4 combinations in total: the outer is supplied to the outer row, the inner is supplied to the inner row, the inner is supplied to the outer row and the inner is supplied to the inner row.

The following description will take the control of oil external supply and discharge as an example; i.e. control oil is taken from control oil inlet 120; the control oil exits the control oil drain port 121 and returns to the tank.

The control oil enters from the control oil inlet 120 and reaches the oil inlet cavity 911 of the direct-acting proportional reversing valve 900 through the first fabrication hole 122, the control oil inlet hole 111, the lower pilot oil inlet 705, the upper pilot oil inlet 701, the pressure reducing channel of the fixed-value pressure reducing valve 800 and the oil inlet of the direct-acting proportional reversing valve 900. Because the proportional electromagnet 950 at the two ends does not have an output signal of an amplifier, the coil 952 does not induce current, the iron core 951 and the push rod 953 are not moved, and the valve core 920 is limited at the middle position of the valve body by the spring 931 and the retainer 932 at the two ends; the control oil reaching the oil inlet chamber 911 is isolated by the valve core 920 and cannot enter the first oil outlet chamber 912 and the second oil outlet chamber 913, and the first oil outlet chamber 912 and the second oil outlet chamber 913 are respectively communicated with the first oil return chamber 914 and the second oil return chamber 915, so that the first oil outlet chamber 912 and the second oil outlet chamber 913 have no pressure oil, and finally, no pressure oil exists at two ends of the main valve element 200, and the main valve element 200 stays at the middle position of the valve body.

The hydraulic oil enters from the oil inlet 116, reaches the oil inlet cavity 101, is isolated by the main valve core 200, cannot enter the first oil outlet cavity 102 and the second oil outlet cavity 103, and the first oil outlet cavity 102 and the second oil outlet cavity 103 are respectively communicated with the first oil return cavity 104 and the second oil return cavity 105, so that no pressure oil exists in the first oil outlet cavity 102 and the second oil outlet cavity 103, and the outer executing mechanism does not act.

Second, the working state

The amplifier inputs signals to the amplifier assembly 650, so that the amplifier synchronously outputs output signals, the signals reach the proportional electromagnet 950 through the sheathed wire 608 and the plug 609, if the given signal instruction requires the main valve element 200 to move rightwards, the proportional amplifier supplies current to the coil 952 on the right side to generate electromagnetic induction, the electromagnetic force drives the armature and the push rod 953 in the iron core 951 to push the valve element 920 and the check ring 932 to move leftwards against the force of the spring 931, so that the oil inlet cavity 911 is communicated with the second oil outlet cavity 913, and the first oil outlet cavity 912 is communicated with the first oil return cavity 914. In the valve core 920 leftwards moving process, the accommodating cavity corresponding to the left spring 931 can be reduced, oil can be compressed everywhere and can go, resistance can be brought to the movement of the valve core 920, at the moment, the eccentric perforation 921 in the middle of the valve core 920 can guide the oil in the left accommodating cavity to the right accommodating cavity, and the right accommodating cavity is enlarged as the valve core 920 leftwards moves and just accommodates the oil in the left accommodating cavity. The eccentric bore also prevents it from being obscured by push rod 953 and ensures that push rod 953 has sufficient contact surface with the end surface of the core 920 to prevent damage to the end surfaces of the two components in contact due to excessive local stress.

Control oil enters from a control oil inlet 120, passes through a first process hole 122, a control oil inlet hole 111, a lower pilot oil inlet 705, an upper pilot oil inlet 701, a pressure reducing channel of a constant value pressure reducing valve 800 and an oil inlet of a direct-acting proportional reversing valve 900, reaches an oil inlet cavity 911 of the direct-acting proportional reversing valve 900, then reaches a second oil outlet cavity 913, an oil outlet of the direct-acting proportional reversing valve 900, a through hole of the constant value pressure reducing valve 800, a second upper pilot oil outlet 703, a first lower pilot oil outlet 706, a first control oil outlet 108, a first inclined hole 107, a first control oil hole 302, a third inclined hole 301, reaches an inner hole of a front cover 300, hydraulic pressure is applied to the left end face of a main valve element 200, the main valve element drives an adjusting screw 252 and a spring seat 254 to move to the right against the force of a spring 253, a sensor 501 at the right end of the main valve element moves to the right together, the position of the main valve element is detected at the same time, the main valve displacement sensor 500 sends a position moving signal of the main valve element 200 to a proportional amplifier 650, and then feeds back to an external controller so as to adjust an input signal to the amplifier at any time to ensure that main spool 200 moves a predetermined distance, wherein the input signal can be voltage or current, the moving distance of main spool 200 is small when the signal value is small, and the moving distance of main spool 200 is large when the signal value is large.

When main valve element 200 moves to the right under the pressure of the control oil on the left end face, the cavity fixed on the right end face becomes smaller, the control oil accumulated inside needs to be discharged in time along with the movement of the main valve element, and the way of discharging the control oil (in this example, discharging) is as follows: the inner hole of the rear cover 400 → the fourth inclined hole 401 → the second control oil hole 402 → the second inclined hole 109 → the second control oil hole 110 → the second lower pilot oil outlet 707 → the first upper pilot oil outlet 702 → the through hole of the fixed value reducing valve 800 → the oil outlet of the direct acting proportional reversing valve 900 → the first oil outlet chamber 912 → the first oil return chamber 914 → the oil return port of the direct acting proportional reversing valve 900 → the through hole of the fixed value reducing valve 800 → the upper pilot oil return port 704 → the lower pilot oil return port 708 → the control oil return hole 112 → the second process hole 123 → the third process hole 114 → the control oil discharge port 121 → the oil tank.

After the main valve element 200 moves rightwards for a short distance, the oil inlet cavity 101 and the second oil outlet cavity 103 start to be communicated through the short arc-shaped groove 202, the first oil outlet cavity 102 and the first oil return cavity 104 start to be communicated through the long arc-shaped groove 201 and the small throttling groove 203, the flow area is small when the moving distance is small, otherwise, the flow area is large, the flow passing area is large when the flow passing area is large under the same pressure difference, and the speed of the oil cylinder is high.

Hydraulic oil flow path when main spool 200 is operating: oil inlet 116 → oil inlet chamber 101 → second oil outlet chamber 103 → second oil outlet 118 → pipe → oil inlet of the cylinder, oil outlet of the cylinder → pipe → first oil outlet 117 → first oil outlet chamber 102 → first oil return chamber 104 → oil return port 119 → pipe → oil tank.

The proportional reversing valve with the displacement sensor and the amplifier of the main valve, which is formed by the scheme, adopts a single spring to control the main valve core to reset, avoids the deviation caused by different forces of the two springs, and has good repeatability; and the pilot valve can be a 6-path direct-acting proportional reversing valve, and can also be used for transferring 10-path direct-acting proportional reversing valves according to requirements, so that the pilot valve can be flexibly selected according to different corresponding speed requirements.

Secondly, the proportional amplifier is arranged in the shell of the displacement sensor at the end face of the main valve, so that the space is saved; meanwhile, the integrated circuit of the amplifier is matched with a heat dissipation plate, so that heat can be effectively dissipated, failure of electronic components due to high temperature is avoided, and reliability is improved.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.