阅读说明：本技术 一种内反馈自密封装夹装置 (Internal feedback self-sealing packaging clamping device ) 是由 肖自富 王富安 万绍刚 刘相杰 杜功优 桑昌勇 胡恺 余彬彬 于 2019-08-07 设计创作，主要内容包括：一种内反馈自密封装夹装置,包括液压缸连接阀块,所述液压缸连接阀块下端设有多路阀,多路阀下端设有固定阀块；所述固定阀块内分别设有活塞安装孔道和工艺油孔,活塞安装孔道内经堵头固定安装有内反馈平衡活塞,所述内反馈平衡活塞包括浮动活塞和控制活塞,浮动活塞内设有浮动活塞上腔,浮动活塞的底部设有圆柱形的浮动凸台,浮动活塞径向设有2组浮动活塞密封圈,2组浮动活塞密封圈之间的活塞壁上周向均布有多个平衡油孔,所述浮动活塞顶部还设有油口密封圈；所述控制活塞位于浮动活塞的下端,控制活塞的底部设有控制凸台,控制活塞径向设有1组控制活塞密封圈。该装置解决了多路阀接口安装面不一致、油口沟槽深浅不一导致密封不严的问题。(An internal feedback self-sealing clamping device comprises a hydraulic cylinder connecting valve block, wherein a multi-way valve is arranged at the lower end of the hydraulic cylinder connecting valve block, and a fixed valve block is arranged at the lower end of the multi-way valve; the fixed valve block is internally provided with a piston mounting pore passage and a process oil hole respectively, an inner feedback balance piston is fixedly mounted in the piston mounting pore passage through an end cap and comprises a floating piston and a control piston, a floating piston upper cavity is arranged in the floating piston, a cylindrical floating boss is arranged at the bottom of the floating piston, the floating piston is radially provided with 2 groups of floating piston sealing rings, a plurality of balance oil holes are uniformly distributed on the piston wall between the 2 groups of floating piston sealing rings in the circumferential direction, and the top of the floating piston is also provided with an oil port sealing ring; the control piston is located the lower extreme of floating piston, and the bottom of control piston is equipped with the control boss, and the control piston is equipped with 1 group control piston sealing washer radially. The device solves the problems of poor sealing caused by inconsistent installation surfaces of the multi-way valve interfaces and inconsistent depths of grooves of the oil ports.)

1. An internal feedback self-sealing clamping device comprises a hydraulic cylinder connecting valve block (101), wherein a multi-way valve (102) is arranged at the lower end of the hydraulic cylinder connecting valve block (101), and a fixed valve block (104) is arranged at the lower end of the multi-way valve (102); the hydraulic control system is characterized in that a piston mounting hole channel (303) and a process oil hole (302) are respectively arranged in the fixed valve block (104), an inner feedback balance piston (103) is fixedly mounted in the piston mounting hole channel (303) through a plug (105), the inner feedback balance piston (103) comprises a floating piston (205) and a control piston (206), a floating piston upper cavity (404) is arranged in the floating piston (205), a cylindrical floating boss (208) is arranged at the bottom of the floating piston (205), 2 groups of floating piston sealing rings (202) are radially arranged on the floating piston (205), a plurality of balance oil holes (204) are uniformly distributed on the piston wall between the 2 groups of floating piston sealing rings (202) in the circumferential direction, and an oil port sealing ring (201) is further arranged at the top of the floating piston (205); the control piston (206) is positioned at the lower end of the floating piston (205), a control boss (209) is arranged at the bottom of the control piston (206), and 1 group of control piston sealing rings (207) are radially arranged on the control piston (206); an annular cavity (403) is formed between the floating piston (205) and the control piston (206), and the annular cavity (403) is connected with the process oil hole (302) through the feedback oil hole (301); a control piston lower cavity (402) is formed between the control piston (206) and the plug (105); the fixed valve block (104) is further provided with an oil inlet (304), an oil outlet (305) and a control oil hole (401), the oil inlet (304) is communicated with the oil outlet (305) through a floating piston upper cavity (404) and a balance oil hole (204), the oil outlet (305) is communicated with an annular cavity (403) through a process oil hole (302) and a feedback oil hole (301), and the control oil hole (401) is connected with a control piston lower cavity (402).

2. The internal feedback self-sealing clamping device is characterized in that sealing surfaces between an oil port at the bottom of the multi-way valve (102) and an oil inlet (304) at the upper end of the internal feedback balance piston (103) are not in the same plane, and sealing grooves of the oil ports are different in depth.

3. An internal feedback self-sealing collet device according to claim 1, wherein the diameter of the annular chamber (403) is larger than the diameter of the upper chamber (404) of the floating piston.

4. An internal feedback self-sealing clamping device according to claim 1, wherein the oil inlet (304) is positioned on the upper end face of the fixed valve block (104); the oil outlet (305) and the control oil hole (401) are positioned on the end surface of the side part of the fixed valve block (104).

5. An internal feedback self-sealing clamping device according to claim 1, wherein the 2 groups of floating piston sealing rings (202) and the 1 group of control piston sealing rings (207) are provided with sealing ring retaining rings (203) at two sides.

6. An internal feedback self-sealing clamping device according to claim 1, wherein a gap of 1-2 mm is kept between the bottom of the control piston (206) and the floating piston (205); a gap within 1mm is kept between the bottom of the control piston (206) and the plug (105).

7. An internal feedback self-sealing clamping device according to claim 1, wherein the balancing oil holes (204) are arranged between 2 groups of floating piston sealing rings (202) and are uniformly distributed along the circumferential direction of the floating piston (205), and the number and the size of the balancing oil holes (204) are determined according to the oil hole diameter at the bottom of the multi-way valve (102), and the number is even.

8. An internal feedback self-sealing clamping device according to claim 1, wherein the control oil hole (401) and the feedback oil hole (301) are not communicated, and both of them adopt mutually independent pressure oil sources.

9. An internal feedback self-sealing collet device according to claim 1, wherein the piston mounting bore (303) is divided by an internal feedback balance piston (103) into a control piston lower chamber (402), an annular chamber (403) and a floating piston upper chamber (404), and both ends of the plug mounting bore (303) are provided with reducing shoulders.

Technical Field

The invention relates to an internal feedback self-sealing clamping device, in particular to a clamping device which is connected with a multi-way valve interface and has internal feedback self-sealing function.

Background

In recent years, with the continuous and rapid development of national economy, the demand of the domestic engineering machinery market is increased day by day, and huge development potential and wide development prospect are highlighted. In the field of engineering machinery, a system usually adopts a common pump source, namely a plurality of actuating mechanisms share one set of hydraulic pump, so that the aims of energy conservation and high efficiency are achieved when the actuating mechanisms work at different times. In order to ensure that the pipeline connection is simple, the arrangement of the whole machine is not too complicated, an independent control valve is not suitable to be adopted, and the multi-way valve can combine various different control valves at the same time, and has the characteristics of compact structure and simple pipeline connection, so the multi-way valve is quickly applied to the field of engineering machinery. The outstanding characteristics and special advantages of the multi-way valve enable the multi-way valve to be applied to the fields of aerospace and the like, and the multi-way valve is developed extremely rapidly and becomes a core component of a plurality of devices.

In order to ensure the quality and performance of the multi-way valve, manufacturers generally build or purchase a test system to perform a series of tests on the multi-way valve. In conventional test system or hydraulic test platform, the multichannel valve that will await measuring is fixed to most utilizing the screw, utilizes standard pipe fittings such as coupling or flange to dock with outside pipeline, dismantles coupling, flange, screw etc. step by step after experimental finishing again, and whole dismouting process is gone on by the manual work, and intensity of labour is big, and efficiency is lower, has influenced the normal supply of material of multichannel valve producer. Afterwards, in order to promote dismouting efficiency, pneumatic cylinder automatic clamping device has appeared, utilizes the thrust of pneumatic cylinder oppression multiple unit valve oil port department's sealing washer to realize self-sealing's effect, improved the efficiency and the degree of automation of clamping to a certain extent. The clamping device requires that all control valves forming the multi-way valve are consistent in type, the installation surfaces are on the same plane, and the depths of oil port grooves are consistent. When the multi-way valve has a large number of external interfaces, different mounting surface heights and different interface depths, the automatic clamping device cannot ensure the reliability of the sealing of the interfaces, is easy to leak, and greatly limits the application of the automatic clamping device.

Disclosure of Invention

The invention aims to provide an internal feedback self-sealing clamping device, which solves the problems of poor sealing and oil leakage caused by the inconsistent installation surfaces and the inconsistent depths of oil ports and grooves of the conventional multi-way valve interface.

The technical scheme adopted for achieving the purpose is that the internal feedback self-sealing clamping device comprises a hydraulic cylinder connecting valve block, wherein a multi-way valve is arranged at the lower end of the hydraulic cylinder connecting valve block, and a fixed valve block is arranged at the lower end of the multi-way valve; the floating valve is characterized in that a piston mounting hole and a process oil hole are respectively formed in the fixed valve block, an inner feedback balance piston is fixedly mounted in the piston mounting hole through an end cap and comprises a floating piston and a control piston, a floating piston upper cavity is formed in the floating piston, a cylindrical floating boss is arranged at the bottom of the floating piston, 2 groups of floating piston sealing rings are radially arranged on the floating piston, a plurality of balance oil holes are circumferentially and uniformly distributed on the piston wall between the 2 groups of floating piston sealing rings, and an oil port sealing ring is further arranged at the top of the floating piston; the control piston is positioned at the lower end of the floating piston, a control boss is arranged at the bottom of the control piston, and 1 group of control piston sealing rings are radially arranged on the control piston; an annular cavity is formed between the floating piston and the control piston and is connected with the process oil hole through a feedback oil hole; a control piston lower cavity is formed between the control piston and the plug; the fixed valve block is also provided with an oil inlet, an oil outlet and a control oil hole, the oil inlet is communicated with the oil outlet through the upper floating piston cavity and the balance oil hole, the oil outlet is communicated with the annular cavity through the process oil hole and the feedback oil hole, and the control oil hole is connected with the lower control piston cavity.

Advantageous effects

Compared with the prior art, the technology of the invention has the following advantages.

1. The design of the internal feedback floating piston of the device is not influenced by the oil port mounting surface and the depth of the groove, and both can realize reliable sealing;

2. the feedback control piston design in the device is not influenced by the pressure of oil liquid at the inlet of the multi-way valve, and leakage-free sealing is ensured.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a schematic diagram of a feedback balance piston according to the present invention;

FIG. 3 is a schematic view of the structure of the feedback oil hole inside the fixed valve block according to the present invention;

FIG. 4 is a schematic view of the structure of the control oil hole inside the fixed valve block according to the present invention;

fig. 5 is a schematic diagram showing the distribution of oil ports of the fixed valve block according to the present invention.

Detailed Description

The invention is further described with reference to the following examples and the accompanying drawings.

The device comprises a hydraulic cylinder connecting valve block 101, as shown in fig. 1-5, a multi-way valve 102 is arranged at the lower end of the hydraulic cylinder connecting valve block 101, and a fixed valve block 104 is arranged at the lower end of the multi-way valve 102; the fixed valve block 104 is internally provided with a piston mounting hole 303 and a process oil hole 302 respectively, an inner feedback balance piston 103 is fixedly mounted in the piston mounting hole 303 through a plug 105, the inner feedback balance piston 103 comprises a floating piston 205 and a control piston 206, a floating piston upper cavity 404 is arranged in the floating piston 205, the bottom of the floating piston 205 is provided with a cylindrical floating boss 208, the floating piston 205 is radially provided with 2 groups of floating piston seal rings 202, a plurality of balance oil holes 204 are circumferentially and uniformly distributed on the piston wall between the 2 groups of floating piston seal rings 202, and the top of the floating piston 205 is further provided with an oil port seal ring 201; the control piston 206 is positioned at the lower end of the floating piston 205, a control boss 209 is arranged at the bottom of the control piston 206, and 1 group of control piston sealing rings 207 are radially arranged on the control piston 206; an annular cavity 403 is formed between the floating piston 205 and the control piston 206, and the annular cavity 403 is connected with the process oil hole 302 through the feedback oil hole 301; a control piston lower cavity 402 is formed between the control piston 206 and the plug 105; the fixed valve block 104 is further provided with an oil inlet 304, an oil outlet 305 and a control oil hole 401, the oil inlet 304 is communicated with the oil outlet 305 through a floating piston upper cavity 404 and a balance oil hole 204, the oil outlet 305 is communicated with an annular cavity 403 through a process oil hole 302 and a feedback oil hole 301, and the control oil hole 401 is connected with a control piston lower cavity 402.

The sealing surface between the oil port at the bottom of the multi-way valve 102 and the oil inlet 304 at the upper end of the inner feedback balance piston 103 is not on the same plane, and the sealing grooves of the oil ports have different depths.

The diameter of the annular chamber 403 is greater than the diameter of the floating piston upper chamber 404.

The oil inlet 304 is positioned on the upper end surface of the fixed valve block 104; the oil outlet 305 and the control oil hole 401 are located on the end surface of the fixed valve block 104 side.

And sealing ring check rings 203 are arranged on two sides of the 2 groups of floating piston sealing rings 202 and the 1 group of control piston sealing rings 207.

A gap of 1-2 mm is kept between the bottom of the control piston 206 and the bottom of the floating piston 205; a gap of less than 1mm is maintained between the bottom of the control piston 206 and the plug 105.

The balance oil holes 204 are arranged between the 2 groups of floating piston seal rings 202 and are uniformly distributed along the circumferential direction of the floating piston 205, the number and the size of the balance oil holes 204 are determined according to the diameter of the oil hole at the bottom of the multi-way valve 102, and the number is even.

The control oil hole 401 and the feedback oil hole 301 are not communicated, and both adopt mutually independent pressure oil sources.

The piston mounting channel 303 is divided into a control piston lower cavity 402, an annular cavity 403 and a floating piston upper cavity 404 by the internal feedback balance piston 103, and both ends of the plug mounting channel 303 are provided with reducing shoulders.

In the invention, as shown in fig. 1, the hydraulic cylinder connecting valve block 101 acts on the upper surface of the multi-way valve 102 through a hydraulic cylinder, the hydraulic cylinder connecting valve block 101 can be pressed or separated from the multi-way valve 102 by using the extension and contraction of the hydraulic cylinder, and the hydraulic cylinder is fixed with the hydraulic cylinder connecting valve block 101 in a hinged mode.

As shown in fig. 2, the bottom of the floating piston 205 has a cylindrical floating boss 208, and 2 sets of floating piston seal rings 202 and 4 sets of seal ring retainer rings 203 are radially arranged; the balance oil holes 204 are arranged in the middle of the 2 groups of floating piston seal rings 202 and are uniformly distributed along the circumferential direction of the floating piston 205, the number and the size of the balance oil holes are determined according to the diameter of the oil hole at the lower end of the multi-way valve 102, and the number is an even number as much as possible; the bottom of the control piston 206 is provided with a control boss 209, 1 group of control piston sealing rings 207 and 2 groups of sealing ring retainer rings 203 are radially arranged, and a gap between the control piston 206 and the floating piston 205 is kept at 1-2 mm.

As shown in fig. 3, a feedback oil hole 301, a process oil hole 302, a piston mounting hole 303 and a control oil hole 401 are designed in the fixed valve block 104; the feedback oil hole 301 is communicated with the process oil hole 302 and the piston mounting hole 303; the piston mounting hole 303 is divided into a control piston lower cavity 402, an annular cavity 403 and a floating piston upper cavity 404 by the internal feedback balance piston 103, and the top of the piston mounting hole 303 is provided with a reducing shoulder; the annular cavity 403 is larger in diameter than the floating piston upper cavity 404; the control piston lower cavity 402 is communicated with the control oil hole 401.

The sealing principle and the specific process of the invention are as follows, after the multi-way valve 102 is clamped by the hydraulic cylinder connecting valve block 101 and the fixed valve block 104, the pressure of hydraulic oil is marked as P1, the hydraulic oil enters the floating piston upper chamber 404 from an oil port at the bottom of the multi-way valve 102, and then flows to the annular chamber 403 through the process oil holes 302 and the feedback oil holes 301 through the plurality of circumferential balancing oil holes 204, as the effective projection area A1 of the annular chamber 403 is larger than the effective projection area A2 of the floating piston upper chamber 404, the two oil parts are communicated and the pressure is consistent, according to a formula F1= P1 x (A1-A2), the floating piston 205 can receive an upward thrust F1, so that the oil port sealing ring 201 at the oil inlet 304 is pressed to be attached to the lower end of. When the thrust F1 reaches the sealing pretightening force F0 required by the oil port sealing ring 201, reliable sealing can be realized. When the hydraulic oil pressure P1 at the inlet of the multi-way valve 102 is too high, in order to prevent the thrust F1 from being too large and even crushing the oil port sealing ring 201, a reducing shoulder is designed at the top of the piston mounting hole 303 to limit the stroke of the floating piston 205; when the pressure P1 of hydraulic oil at the inlet of the multi-way valve 102 is low, the thrust F1 is much smaller than F0, and reliable sealing cannot be achieved by the internal oil pressure, at this time, one path of control pressure oil is introduced to the control piston lower cavity 402 through the control oil hole 401, and the pressure of the control pressure oil is marked as P2, so that the thrust F2= (P2-P1) × a1 is generated, the control piston 206 and the floating piston 205 are pushed to move upwards until the oil port sealing ring 201 is pressed, and no-leakage sealing under a low pressure condition is achieved. As can be seen from fig. 3 and 4, when the pressure P2 of the control oil hole 401 is less than P1, the control piston 206 does not work, and the upward thrust F1 generated by the pressure P1 of the hydraulic oil at the inlet of the multi-way valve 102 and the area difference between the two ends of the floating piston 205 presses the oil port sealing ring 201 to realize reliable sealing; when the pressure P1 of the oil port of the multi-way valve 102 is less than P2, the control piston 206 is under the action of the thrust F2, and pushes the floating piston 205 to move upwards and press the oil port sealing ring 201 to realize the leakage-free sealing under the low pressure condition.

An inner feedback balance piston 103 is arranged in a hole channel in the fixed valve block 104 and comprises a floating piston 205 and a control piston 206, the floating piston 205 can float up and down under the action of oil pressure and is compressed and sealed reversely, the influence of the difference between the height of an oil port mounting surface and the depth of a groove is avoided, and the sealing is reliable; the control piston 206 is arranged below the floating piston 205, when the inlet pressure of the multi-way valve is too low, the control piston 206 pushes the floating piston 205 to press the sealing ring, and reliable sealing can be ensured under the conditions of high pressure and low pressure.