A push actuator with a highly reliable pressure reducing valve

Abstract

The present invention discloses a push actuator with a highly reliable pressure reducing valve, which includes a piston rod disposed inside a cylinder barrel. Guide sleeves and integrated end caps are respectively fixedly provided at both ends of the cylinder barrel. An exhaust groove unit for exhausting the rod chamber of the cylinder barrel is formed on the inner wall at the port of the rod chamber of the cylinder barrel. A damping hole is formed in the inner wall of the rodless chamber of the cylinder barrel along its radial direction, and a steel ball is arranged in the damping hole. When the steel ball contacts the stepped surface of the damping hole, the damping hole is sealed. An actuator air inlet hole communicating with the rodless chamber of the cylinder barrel is formed on the integrated end cap. A valve housing is arranged on the outer end surface of the integrated end cap. A pressure reducing valve hole communicating with the actuator air inlet hole is arranged in the valve housing, and a pressure reducing valve assembly is arranged in the pressure reducing valve hole. The present invention has the advantages that the pressure reducing valve and the actuator are integrated into one structure, reducing the air path interface and the pressure and flow loss of the pipeline, saving the installation space; the actuator is sensitive and rapid in response, stable and safe in operation, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of actuators, and specifically to a pushing actuator with a highly reliable pressure reducing valve. Background Art

[0002] Actuators, as a type of conversion and execution mechanism, are applied in various fields. Pneumatic actuators, in particular, have the advantages of simple structure, fast response speed, low cost, and high reliability. However, when applied in the aviation field, a high-pressure gas source cylinder is generally used as the power source. During operation, the rapid release of the high-pressure gas source will generate a large impact on the actuator and the execution component. Currently, in the aviation field, the general solution to the impact problem for pneumatic actuators is to reduce the cylinder diameter and increase the buffer. The patent publication number CN203770288U discloses a pneumatic actuator, specifically discloses a buffer device provided at the air inlet end of the piston rod, which absorbs the kinetic energy of the piston through the buffer device, thus buffering the inertia of the piston. However, if the buffer fails or the components are damaged after long-term use, the complex high-pressure gas working pipeline needs to be carefully inspected, otherwise it will pose a safety hazard.

[0003] Therefore, it is necessary to add a separate pressure reducing valve in the pipeline connection. During use, it can reduce the pressure of the working gas and reduce the safety hazard of the gas pressure operation. However, after the pressure gas is reduced by the externally installed pressure reducing valve, not only the energy of the gas source in the pipeline will be lost, but also the gas flow rate will decrease significantly. When the actuator operates, the output load will be relatively small. There are problems such as complex structure, large occupied space, and inability to meet the space requirements; it is impossible to ensure the gas flow rate through the pressure reducing valve assembly during pressure reduction, thus unable to ensure the output force of the actuator; the actuator has a slow reaction speed, unstable operation, etc. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a pushing actuator with a highly reliable pressure reducing valve. The pressure reducing valve and the safety valve are integrated with the actuator into an integrated structure, and the structural modular design is more compact; it reduces the gas path interface and the pressure and flow losses of the pipeline, saves the installation space; reduces the impact generated inside the entire actuator, and ensures the gas flow rate through the pressure reducing valve assembly during pressure reduction, ensuring the output force of the actuator; the actuator is sensitive, rapid, has a fast response speed, stable operation, safe and reliable, and can effectively solve the problems in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A push actuator with a highly reliable pressure reducing valve, comprising a piston rod disposed within a cylinder barrel. A guide sleeve and an integrated end cover are respectively fixedly provided at the rod chamber port and the rodless chamber port of the cylinder barrel. The telescopic end of the piston rod penetrates through the guide sleeve and is fixedly provided with a push joint. A return spring is provided on the piston rod between its piston ring and the guide sleeve; An exhaust groove unit for exhausting the rod chamber of the cylinder barrel is provided on the inner wall at the rod chamber port of the cylinder barrel; A damping hole is provided on the inner wall of the rodless chamber of the cylinder barrel along its radial direction. The damping hole is a multi-layer stepped hole structure, and steel balls are provided in the damping hole. When the steel balls contact the stepped surface of the damping hole, a one-way damping valve is formed to seal the damping hole; An actuator inlet hole communicating with the rodless chamber of the cylinder barrel is provided on the integrated end cover. A valve housing is provided on the outer end surface of the integrated end cover. A pressure reducing valve hole communicating up and down is provided in the valve housing. A first communication hole communicating with the actuator inlet hole is provided in the pressure reducing valve hole; An air inlet is provided at one end of the valve housing. A second communication hole is provided between the air inlet and the pressure reducing valve hole. And a pressure reducing valve assembly for reducing the pressure of the pressurized gas flowing in from the air inlet is provided in the pressure reducing valve hole.

[0006] Further, the pressure reducing valve assembly includes an upper plug fixed to the upper port of the pressure reducing valve hole. Inside the pressure reducing valve hole and below the upper plug, a valve seat, a sealing seat, and a spacer ring are sequentially and hermetically fixed and nested. The valve seat is provided with a valve guiding hole that penetrates up and down and is in the shape of a stepped hole. A pressure reducing valve in the shape of a stepped shaft is slidably nested in the valve guiding hole. A limiting round table that can abut against the lower shaft shoulder II of the pressure reducing valve is provided on the stepped surface of the valve guiding hole. An air vent hole I communicating with the second communication hole is opened on the side wall of the bottom of the valve seat. An air vent hole II that penetrates up and down is provided inside the pressure reducing valve. A first spring seat abuts against the top end of the pressure reducing valve. A first spring is provided between the first spring seat and the inner top wall of the upper plug. The sealing seat is an inverted stepped shaft structure. The sealing seat is provided with a stepped through hole along its axial direction. The outer stepped surface of the sealing seat is a conical surface. A plurality of air vent holes III that are inclined and perpendicular to the conical surface are opened on the conical surface. The through hole communicates with the intake port of the first communication hole through the air vent holes III. The hollow convex shaft at the bottom of the sealing seat is a positioning convex shaft. A push rod is slidably nested in the positioning convex shaft. The length of the push rod is greater than the length of the sealing seat. The central hole of the spacer ring is a positioning hole. A plurality of air vent holes IV are opened on the circumferential direction of the spacer ring around the positioning hole. The spacer ring is located below the intake port of the first communication hole. The air vent holes IV communicate with the air vent holes III. A lower housing is fixed to the lower port of the pressure reducing valve hole. A lower plug is fixed to the bottom end of the lower housing. A second spring seat that can move up and down is provided inside the lower housing. A second spring is provided between the lower plug and the second spring seat. The top end of the second spring seat abuts against a base. The base is an inverted stepped shaft structure. A gasket is provided on the convex shaft at the lower end of the base. A diaphragm is provided between the gasket and the stepped surface of the base. A compression nut is threadedly connected to the convex shaft of the base below the gasket. A pressure ring is provided on the outer edge of the bottom surface of the diaphragm. The bottom surface of the pressure ring abuts against the top surface of the lower housing. A stepped surface that abuts against the outer edge of the top surface of the diaphragm is provided in the valve housing at the position of the diaphragm. The upper end of the push rod abuts against the bottom end of the pressure reducing valve. The lower end of the push rod abuts against the top end of the base. The elastic force of the first spring is less than the elastic force of the second spring.

[0007] Further, a first ball head rod is provided on the top surface of the pressure reducing valve. A hemispherical groove I adapted to the first ball head rod is opened on the bottom surface of the first spring seat. Ball tops are provided at both the upper and lower ends of the push rod. A second ball head rod is provided on the top surface of the second spring seat. A hemispherical groove II adapted to the second ball head rod is opened on the bottom surface of the convex shaft at the lower end of the base.

[0008] Further, the exhaust groove unit includes an exhaust groove I opened on the end surface of the rod chamber of the cylinder barrel. The port of the rod chamber of the cylinder barrel is a stepped hole structure. An exhaust groove II and an exhaust groove III are respectively opened on the outer hole and the inner hole of the port of the rod chamber of the cylinder barrel. The exhaust groove II and the exhaust groove III correspond to the position of the exhaust groove I. Conical platform structures for installation are symmetrically provided on the outer wall of the cylinder barrel. An installation hole is opened on the axial end surface outside the installation platform.

[0009] Furthermore, the rodless cavity port of the cylinder barrel has a stepped hole structure. The integrated end cover is provided with a threaded toroidal surface at the outer hole corresponding to the rodless cavity port of the cylinder barrel, a sealing toroidal surface at the inner hole corresponding to the rodless cavity port of the cylinder barrel, and a ring groove surface that is in clearance fit with the inner wall of the cylinder barrel at the inner side end of the integrated end cover located at the sealing toroidal surface; the damping hole is opened at the position of the ring groove surface, and an exhaust notch is opened on the stepped surface where the damping hole is in close contact with the steel ball; a weight-reducing hole is opened on the inner end surface of the integrated end cover, and the actuator air inlet hole is communicated with the weight-reducing hole.

[0010] Furthermore, an outwardly protruding safety valve square platform is also provided on the outer wall of the valve housing. The safety valve square platform is provided with a safety valve port. A third communication hole is opened in the valve housing between the safety valve port and the pressure reducing valve hole, and the safety valve port is connected with a safety valve assembly.

[0011] Furthermore, the safety valve assembly includes a safety valve housing that is hermetically connected to the safety valve port. A stepped hole is provided in the safety valve housing along its axial direction. A safety valve flap is provided at the stepped surface of the stepped hole in the safety valve housing. A safety valve plug cap is provided at the end of the safety valve housing. A third spring seat is provided at the inner end of the safety valve plug cap, and a third spring is provided between the third spring seat and the safety valve flap; an exhaust hole is opened at the outer hole of the stepped hole on the side wall of the safety valve housing; the third communication hole is communicated with the intake port of the first communication hole in the pressure reducing valve hole.

[0012] Furthermore, an intake joint is connected to the intake port. The internal cavity of the intake joint has a stepped hole structure. A short filter element is provided in the inner hole of the internal cavity of the intake joint. The short filter element includes a first filter element matrix. A ring groove is opened on the outer end surface of the first filter element matrix. A first filter screen and a second filter screen are sequentially provided in the ring groove. A filter element gasket ring is provided at the circumferential edge of the outer end of the second filter screen; a plurality of first air-permeable holes are opened in the first filter element matrix in the area corresponding to the ring groove.

[0013] Furthermore, a long filter element is also provided inside the intake joint and located inside the short filter element. The long filter element includes a second filter element matrix. The second filter element matrix is a hollow sleeve structure and is arranged along the axial direction of the intake joint. The outer end of the second filter element matrix is a closed structure, and the inner open end of the second filter element matrix corresponds to the position of the second communication hole; a plurality of second air-permeable holes are opened on the circumferential outer wall of the second filter element matrix, and a third filter screen is wrapped around the area of the circumferential outer wall of the second filter element matrix corresponding to the second air-permeable holes; a convex platform is provided on the inner end surface of the first filter element matrix. The convex platform of the short filter element abuts against the closed end surface of the second filter element matrix, and the outer end surface of the first filter element matrix abuts against the stepped surface inside the intake joint; a first shoulder is provided at the inner end of the second filter element matrix. A ring groove adapted to the first shoulder is opened on the inner end surface of the intake joint. The first shoulder is nested in the ring groove of the intake joint, and a stepped surface that abuts against the first shoulder is provided at the position of the intake port of the second communication hole in the valve housing.

[0014] Further, a plurality of ventilation grooves are formed in the circumferential direction of the bottom surface of the limiting frustum; a sealing ring groove is formed in the bottom surface of the pressure reducing valve, and a sealing ring gasket is arranged in the sealing ring groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: for the pushing actuating cylinder with a highly reliable pressure reducing valve, the pressure reducing valve assembly and the safety valve assembly are installed in the valve housing of the integrated end cover, so that the pressure reducing valve and the safety valve are integrated with the actuating cylinder into an integral structure, and the modular design of the structure is more compact; the air path interfaces, pipeline pressure and flow losses are reduced, and the installation space is saved; the pressure reducing valve assembly on the actuating cylinder reduces the pressure gas to the required pressure, reduces the impact on the interior of the whole actuating cylinder, and ensures the gas flow through the pressure reducing valve assembly while reducing the pressure, thereby ensuring the output force of the actuating cylinder; the pressure reducing valve assembly has the advantages of high transmission precision, stable transmission, sensitive and rapid reaction, fast response speed, stable and reliable operation, etc.; the working air pressure is not higher than the set safety pressure through the safety valve assembly, ensuring the safe and reliable operation of the actuating cylinder; the short filter element and the long filter element arranged inside the air inlet joint filter the air flow, further ensuring the working stability of the pressure reducing valve assembly. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a top view of the actuating cylinder of the present invention;

[0018] Figure 3 is a schematic structural diagram of the interior of the integrated end cover of the present invention;

[0019] Figure 4 is a sectional view of the integrated end cover of the present invention at the position of the pressure reducing valve assembly;

[0020] Figure 5 is Figure 3 a partial enlarged view at the position of the pressure reducing valve;

[0021] Figure 6 is Figure 3 a partial enlarged view at the position of the lower housing;

[0022] Figure 7 is a schematic structural diagram of the pressure reducing valve assembly of the present invention;

[0023] Figure 8 is a schematic structural diagram of the valve seat of the present invention;

[0024] Figure 9 is a bottom view of the valve seat of the present invention;

[0025] Figure 10 is a schematic structural diagram of the pressure reducing valve of the present invention;

[0026] Figure 11 Structural schematic diagram of the spring seat of the present invention;

[0027] Figure 12 Structural schematic diagram of the seal seat of the present invention;

[0028] Figure 13 Structural schematic diagram of the spacer ring of the present invention;

[0029] Figure 14 Top view of the spacer ring of the present invention;

[0030] Figure 15 Structural schematic diagram of the base of the present invention;

[0031] Figure 16 Structural schematic diagram of the second spring seat of the present invention;

[0032] Figure 17 Top view of the integrated end cap of the present invention;

[0033] Figure 18 Structural schematic diagram of the safety valve housing of the present invention;

[0034] Figure 19 Cross-sectional view of the valve housing at the safety valve assembly of the present invention;

[0035] Figure 20 Structural schematic diagram of the short filter element of the present invention;

[0036] Figure 21 Side view of one side of the filter element matrix of the present invention;

[0037] Figure 22 Structural schematic diagram of the long filter element of the present invention;

[0038] Figure 23 Cross-sectional view of the cylinder barrel of the present invention;

[0039] Figure 24 Partial enlarged view of the cylinder barrel of the present invention;

[0040] Figure 25 is Figure 23 Partial enlarged view at the damping hole;

[0041] Figure 26 Bottom view of the damping hole of the present invention.

[0042] In the figure:

[0043] 1. Cylinder barrel; 101. Exhaust groove 1; 102. Exhaust groove 2; 103. Exhaust groove 3; 104. Damping hole; 105. Exhaust notch; 106. Mounting table;

[0044] 2. Piston rod; 21. Pushing joint; 3. Guide sleeve; 4. Return spring;

[0045] 5. Integral end cover; 51. Weight reduction hole; 52. Ring groove surface; 53. Sealing ring surface; 54. Threaded ring surface; 55. Actuating cylinder air inlet hole; 56. Valve housing; 57. Pressure reducing valve hole; 58. Communication hole one; 59. Air inlet; 510. Communication hole two; 511. Safety valve square platform; 512. Safety valve port; 513. Communication hole three;

[0046] 6. Air inlet joint; 61. Short filter element; 611. Filter element matrix one; 612. Filter screen one; 613. Filter screen two; 614. Filter element gasket ring; 615. Vent hole one; 616. Boss; 62. Long filter element; 621. Filter element matrix two; 622. Vent hole two; 623. Filter screen three; 624. Shoulder one;

[0047] 7. Pressure reducing valve assembly; 71. Upper plug; 72. Spring one; 73. Spring seat one; 731. Hemispherical groove one; 74. Valve seat; 741. Valve guiding hole; 742. Limiting round platform; 743. Vent hole one; 744. Vent groove; 75. Pressure reducing valve; 751. Vent hole two; 752. Sealing ring gasket; 753. Ball head rod one; 754. Shoulder two; 76. Sealing seat; 761. Gas passing hole; 762. Vent hole three; 763. Positioning convex shaft; 77. Spacer ring; 771. Positioning hole; 772. Vent hole four; 78. Push rod; 781. Ball top; 79. Diaphragm; 710. Base; 7101. Hemispherical groove two; 711. Gasket; 712. Pressure ring; 713. Compression nut; 714. Spring seat two; 7141. Ball head rod two; 715. Lower housing; 716. Spring two; 717. Lower plug; 718. Back tightening nut one;

[0048] 8. Safety valve assembly; 81. Safety valve housing; 811. Exhaust hole; 82. Safety valve plug; 83. Spring seat three; 84. Spring three; 85. Back tightening nut two; 86. Safety valve; 9. Steel ball. Detailed implementation mode

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0050] Please refer to Figure 1 - 26, the present invention provides a technical solution: a push actuator with a highly reliable pressure reducing valve, which includes a piston rod 2 disposed inside a cylinder barrel 1. A guide sleeve 3 and an integrated end cap 5 are respectively fixed at the rod chamber port and the rodless chamber port of the cylinder barrel 1. The telescopic end of the piston rod 2 penetrates through the guide sleeve 3 and is fixedly provided with a push joint 21. A return spring 4 is disposed between the piston ring of the piston rod 2 and the guide sleeve 3; on the inner wall of the rod chamber port of the cylinder barrel 1, an exhaust groove unit for exhausting the rod chamber of the cylinder barrel 1 is provided; the exhaust groove unit includes an exhaust groove one 101 provided on the rod chamber end face of the cylinder barrel 1. The rod chamber port of the cylinder barrel 1 is a stepped hole structure. An exhaust groove two 102 and an exhaust groove three 103 are respectively provided in the outer hole and the inner hole of the rod chamber port of the cylinder barrel 1, and the positions of the exhaust groove two 102 and the exhaust groove three 103 correspond to the exhaust groove one 101; the setting of the exhaust groove unit can not only ensure unobstructed air intake and exhaust in the rod chamber of the cylinder barrel 1, but also prevent a large amount of dust or impurities from entering through the air inlet and outlet;

[0051] On the outer wall of the cylinder barrel 1, mounting platforms 106 with a frustum structure are symmetrically provided, and mounting holes are provided on the axial end faces outside the mounting platforms 106; the whole actuator is hinged to an external support through the mounting platforms 106;

[0052] The rodless chamber port of the cylinder barrel 1 is a stepped hole structure. The integrated end cap 5 is provided with a threaded ring surface 54 at the outer hole corresponding to the rodless chamber port of the cylinder barrel 1, and a sealing ring surface 53 at the inner hole corresponding to the rodless chamber port of the cylinder barrel 1. And on the integrated end cap 5, a ring groove surface 52 with a clearance fit with the inner wall of the cylinder barrel 1 is provided on the inner side end of the sealing ring surface 53;

[0053] On the inner wall of the rodless chamber of the cylinder barrel 1, a damping hole 104 is provided along its radial direction. The damping hole 104 is a multi-layer stepped hole structure, and a steel ball 9 is provided in the damping hole 104. When the steel ball 9 contacts the stepped surface of the damping hole 104, a one-way damping valve is formed to seal the damping hole 104; the damping hole 104 is provided at the position of the ring groove surface 52, and an exhaust notch 105 is provided on the stepped surface where the damping hole 104 is in close contact with the steel ball 9;

[0054] On the inner side end face of the integrated end cap 5, a weight-reducing hole 51 communicating with the rodless chamber of the cylinder barrel 1 is provided; on the integrated end cap 5, an actuator air inlet hole 55 communicating with the weight-reducing hole 51 is provided. A valve housing 56 is provided on the outer side end face of the integrated end cap 5. A pressure reducing valve hole 57 penetrating up and down is provided in the valve housing 56, and a communication hole one 58 communicating with the actuator air inlet hole 55 is provided in the pressure reducing valve hole 57; on one side end of the valve housing 56, an air inlet 59 is provided. A communication hole two 510 is provided between the air inlet 59 and the pressure reducing valve hole 57, and a pressure reducing valve assembly 7 for reducing the pressure of the pressurized gas flowing in from the air inlet 59 is provided in the pressure reducing valve hole 57; an air inlet joint 6 is connected to the air inlet 59;

[0055] The pressure reducing valve assembly 7 includes an upper plug 71 fixedly provided at the upper port of the pressure reducing valve hole 57. Inside the pressure reducing valve hole 57 and below the upper plug 71, a valve seat 74, a sealing seat 76, and a spacer ring 77 are sequentially and fixedly nested in a sealed manner. The valve seat 74 is provided with a valve guiding hole 741 that penetrates up and down and is in the shape of a stepped hole. A stepped shaft-shaped pressure reducing valve 75 is slidably nested in the valve guiding hole 741. A limiting round platform 742 that can abut against the lower shaft shoulder 754 of the pressure reducing valve 75 is provided on the stepped surface of the valve guiding hole 741. An air vent hole 743 communicating with the second communication hole 510 is opened on the side wall at the bottom of the valve seat 74. An air vent hole 751 that penetrates up and down is provided inside the pressure reducing valve 75. A first spring seat 73 abuts against the top end of the pressure reducing valve 75. A first spring 72 is provided between the first spring seat 73 and the inner top wall of the upper plug 71. The sealing seat 76 is in the structure of an inverted stepped shaft. The sealing seat 76 is provided with a stepped hole-shaped air passing hole 761 along its axial direction. The outer stepped surface of the sealing seat 76 is a conical surface. A plurality of air vent holes 762 that are inclined and perpendicular to the conical surface are opened on the conical surface. The air passing hole 761 is communicated with the intake port of the first communication hole 58 through the air vent holes 762. The plurality of inclined air vent holes 762 can increase the air flow rate to the greatest extent while reducing the layout space. The hollow convex shaft at the bottom of the sealing seat 76 is a positioning convex shaft 763. A push rod 78 is slidably nested in the positioning convex shaft 763, and the length of the push rod 78 is greater than the length of the sealing seat 76. The central hole of the spacer ring 77 is a positioning hole 771. A plurality of air vent holes 772 are opened on the circumferential direction of the spacer ring 77 outside the positioning hole 771. The spacer ring 77 is located below the intake port of the first communication hole 58, and the air vent holes 772 are communicated with the air vent holes 762. A lower housing 715 is fixedly provided at the lower port of the pressure reducing valve hole 57. A lower plug 717 is fixedly provided at the bottom end of the lower housing 715. The lower plug 717 is threadedly connected to the circumferential inner wall of the lower housing 715. A first back-tightening nut 718 is provided on the circumferential outer wall of the lower plug 717. A second spring seat 714 that can move up and down is provided inside the lower housing 715. A second spring 716 is provided between the lower plug 717 and the second spring seat 714. The top end of the second spring seat 714 abuts against a base 710. The base 710 is in the structure of an inverted stepped shaft. A gasket 711 is provided on the convex shaft at the lower end of the base 710. A diaphragm 79 is provided between the gasket 711 and the stepped surface of the base 710. The diaphragm 79 seals the part below the spacer ring 77 in the pressure reducing valve hole 57. A compression nut 713 is threadedly connected to the convex shaft of the base 710 below the gasket 711. An outer edge of the bottom surface of the diaphragm 79 is provided with a pressing ring 712. The bottom surface of the pressing ring 712 abuts against the top surface of the lower housing 715, and a stepped surface that abuts against the outer edge of the top surface of the diaphragm 79 is provided at the position of the diaphragm 79 in the valve housing 56. The upper end of the push rod 78 abuts against the bottom end of the pressure reducing valve 75, and the lower end of the push rod 78 abuts against the top end of the base 710. The elastic force of the first spring 72 is less than the elastic force of the second spring 716.

[0056] An outwardly protruding safety valve platform 511 is further provided on the outer wall of the valve housing 56. A safety valve port 512 is provided on the safety valve platform 511. A third communication hole 513 is provided in the valve housing 56 between the safety valve port 512 and the pressure reducing valve hole 57. And the safety valve port 512 is connected with a safety valve assembly 8; the safety valve assembly 8 includes a safety valve housing 81 hermetically connected to the safety valve port 512. A stepped hole is provided in the safety valve housing 81 along its axial direction. A safety valve flap 86 is provided at the stepped surface of the stepped hole in the safety valve housing 81. The end of the outer wall of the safety valve housing 81 is threadedly connected with a safety valve plug 82. A second back-tightening nut 85 for tightly backing the safety valve plug 82 is provided on the safety valve housing 81. A third spring seat 83 is provided at the inner end of the safety valve plug 82. A third spring 84 is provided between the third spring seat 83 and the safety valve flap 86; an exhaust hole 811 is provided in the side wall of the safety valve housing 81 at the outer hole of the stepped hole; the third communication hole 513 is communicated with the intake port of the first communication hole 58 in the pressure reducing valve hole 57.

[0057] Working principle:

[0058] When the air source is not connected, since the elastic force of the first spring 72 is less than the elastic force of the second spring 716, the pressure reducing flap 75 is pushed upward by the ejector rod 78. The second shoulder 754 of the pressure reducing flap 75 abuts against the limiting frustum 742 of the valve seat 74. A gap is left between the pressure reducing flap 75 and the sealing seat 76. The pressure reducing valve assembly 7 is in an open state;

[0059] During operation, the air source supplies pressurized gas into the pressure reducing valve hole 57 through the intake joint 6. The pressurized gas enters the valve seat 74 through the second communication hole 510 and the first ventilation hole 743. The gas is stably decompressed through the gap between the pressure reducing flap 75 and the sealing seat 76. The decompressed gas passes through the air hole 761, the third ventilation hole 762, the first communication hole 58 and the actuator intake hole 55 and then enters the rodless cavity of the cylinder barrel 1. The gas pushes the piston rod 2 to quickly extend out of the cylinder barrel 1 towards the rod cavity direction;

[0060] During the working process, part of the decompressed gas flows upward through the vent hole two 751 on the pressure reducing valve 75, and the other part of the gas flows downward through the vent hole three 762 of the sealing seat 76 and the vent hole four 772 of the spacer ring 77. Since the diaphragm 79 seals the part of the pressure reducing valve hole 57 below the spacer ring 77, the gas working chamber pressure above the diaphragm 79 in the pressure reducing valve hole 57 is the same; when the gas pressure provided by the gas source is greater than the elastic force exerted by the spring two 716 on the spring seat two 714, the pressurized gas in the pressure reducing valve hole 57 pushes the diaphragm 79 to bend downward, the spring one 72 exerts an elastic force on the spring seat one 73, and the spring seat one 73 pushes the pressure reducing valve 75 and the ejector rod 78 to move downward, reducing the ventilation cross-sectional area between the pressure reducing valve 75 and the sealing seat 76, thereby reducing the gas pressure introduced into the vent hole 761 again; when the gas pressure provided by the gas source is less than the elastic force exerted by the spring two 716 on the spring seat two 714, the elastic force exerted by the spring two 716 on the spring seat two 714 makes the diaphragm 79 return to its original state, and the base 710 pushes the ejector rod 78 and the pressure reducing valve 75 upward, increasing the ventilation cross-sectional area between the pressure reducing valve 75 and the sealing seat 76, thereby increasing the gas pressure introduced into the vent hole 761; the elastic force exerted by the spring one 72 on the spring seat one 73 and the elastic force exerted by the spring two 716 on the spring seat two 714 automatically adjust the output air pressure of the gas, ensuring the stability of the output air pressure after decompression and improving the high working reliability of the pressure reducing valve assembly 7.

[0061] During the process of the piston rod 2 extending, the gas in the rodless cavity of the cylinder barrel 1 flows towards the damping hole 104 through the annular groove surface 52 of the integrated end cover 5. The gas pushes the steel ball 9 to contact the step surface of the damping hole 104 to form a one-way damping valve. When the actuating cylinder is pushed out, the intake air flow rate of the rodless cavity of the cylinder barrel 1 is much greater than the exhaust air flow rate of the exhaust notch 105, and the action is rapid, which can be regarded as the sealing of the damping hole 104 and the steel ball 9; at the same time, the gas in the rod chamber of the cylinder barrel 1 is discharged through the exhaust groove three 103, the exhaust groove two 102 and the exhaust groove one 101; realizing the fast pushing function of the piston rod 2;

[0062] After the pushing action of the actuating cylinder is completed, the gas source stops supplying gas. The gas in the rodless cavity of the cylinder barrel 1 slowly discharges through the damping hole 104, and the return spring 4 exerts an elastic force on the piston rod 2 to make it return to its original state;

[0063] When unexpected situations such as excessive pressure or blockage occur inside the integrated end cover 5, the internal air pressure flows towards the safety valve port 512 through the communication hole three 513. The air flow pushes open the safety valve flap 86 and discharges into the atmosphere from the exhaust hole 811, so that the working air pressure will not be higher than the set safety pressure, ensuring the safe and reliable operation of the actuating cylinder.

[0064] Further, a first ball head rod 753 is provided on the top surface of the pressure relief valve 75, and a first hemispherical groove 731 adapted to the first ball head rod 753 is formed on the bottom surface of the first spring seat 73; ball tops 781 are provided at both the upper and lower ends of the push rod 78; a second ball head rod 7141 is provided on the top surface of the second spring seat 714, and a second hemispherical groove 7101 adapted to the second ball head rod 7141 is formed on the bottom surface of the convex shaft at the lower end of the base 710; spherical point contacts are formed between the pressure relief valve 75 and the first spring seat 73, between the push rod 78 and the pressure relief valve 75, between the push rod 78 and the base 710, and between the base 710 and the second spring seat 714. The pressure reducing valve assembly 7 has the advantages of high transmission accuracy, stable transmission, sensitive and rapid response, fast response speed, and stable and reliable operation.

[0065] Further, the internal cavity of the air inlet joint 6 is a stepped hole structure. A short filter element 61 is provided in the inner hole of the internal cavity of the air inlet joint 6. The short filter element 61 includes a first filter element matrix 611. A ring groove is formed on the outer end face of the first filter element matrix 611. A first filter screen 612 and a second filter screen 613 are sequentially arranged in the ring groove. A filter element gasket ring 614 is provided at the circular peripheral edge of the outer end of the second filter screen 613; a plurality of first air permeable holes 615 are formed in the area of the first filter element matrix 611 corresponding to the ring groove; a long filter element 62 is further provided inside the air inlet joint 6 and located inside the short filter element 61. The long filter element 62 includes a second filter element matrix 621. The second filter element matrix 621 is a hollow sleeve structure and is arranged along the axial direction of the air inlet joint 6. The outer end of the second filter element matrix 621 is a closed structure. The inner open end of the second filter element matrix 621 corresponds to the position of the second communication hole 510; a plurality of second air permeable holes 622 are formed on the circumferential outer wall of the second filter element matrix 621, and a third filter screen 623 is wrapped around the area of the circumferential outer wall of the second filter element matrix 621 corresponding to the second air permeable holes 622; a convex platform 616 is provided on the inner end face of the first filter element matrix 611. The convex platform 616 of the short filter element 61 abuts against the closed end face of the second filter element matrix 621, and the outer end face of the first filter element matrix 611 abuts against the stepped surface inside the air inlet joint 6; a first shoulder 624 is provided at the inner end of the second filter element matrix 621. A ring groove adapted to the first shoulder 624 is formed on the inner end face of the air inlet joint 6. The first shoulder 624 is nested in the ring groove of the air inlet joint 6, and a stepped surface abutting against the first shoulder 624 is provided at the position of the air inlet port of the second communication hole 510 inside the valve housing 56; the air flow entering from the air inlet joint 6 is filtered twice by the short filter element 61 and the long filter element 62 provided inside the air inlet joint 6. The air flow filtering accuracy is high. The short filter element 61 and the long filter element 62 are simple and compact in structure, reasonable in layout, and convenient to disassemble and assemble.

[0066] Further, a plurality of ventilation grooves 744 are formed in the circumferential direction of the bottom surface of the limiting frustum 742. The ventilation grooves 744 prevent the shoulder two 754 of the pressure reducing valve 75 from being too tightly attached to the limiting frustum 742 of the valve seat 74, thereby affecting the response speed of the pressure reducing valve 75. A sealing ring groove is formed in the bottom surface of the pressure reducing valve 75, and a sealing ring gasket 752 is arranged in the sealing ring groove.

[0067] The push actuator with a highly reliable pressure reducing valve disclosed in this embodiment installs the pressure reducing valve assembly 7 and the safety valve assembly 8 in the valve housing 56 of the integrated end cap 5, integrating the pressure reducing valve and the actuator into an integrated structure, with a more compact modular design of the structure; reducing the air circuit interface and the pressure and flow loss of the pipeline, saving the installation space; the pressure reducing valve assembly 7 on the actuator reduces the pressure gas to the required pressure, reducing the impact generated by the piston rod 2 on the cylinder barrel 1, reducing the impact on the entire interior of the actuator, and ensuring the gas flow through the pressure reducing valve assembly 7 while reducing the pressure, thereby ensuring the output force of the actuator; the pressure reducing valve assembly 7 has the advantages of high transmission accuracy, stable transmission, sensitive and rapid response, fast response speed, stable and reliable operation, etc.; the safety valve assembly 8 ensures that the working air pressure does not exceed the set safety pressure, ensuring the safe and reliable operation of the actuator; the short filter element 61 and the long filter element 62 provided inside the air inlet joint 6 filter the air flow, further ensuring the working stability of the pressure reducing valve assembly 7.

[0068] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A push actuator with a high-reliability pressure reducing valve, comprising a piston rod arranged in a cylinder, a guide sleeve fixedly arranged at the rod cavity port of the cylinder, an integrated end cover fixedly arranged at the rodless cavity port of the cylinder, a telescopic end of the piston rod passing through the guide sleeve and fixedly arranged with a push joint, characterized in that: A return spring is provided on the piston rod between its piston ring and the guide sleeve; an exhaust groove unit for exhausting the cylinder rod chamber is provided on the inner wall at the end of the cylinder rod chamber; a damping hole is provided on the inner wall of the cylinder rodless chamber along its radial direction, the damping hole is a multi-layer step hole structure, and a steel ball is provided in the damping hole, and a one-way damping valve is formed when the steel ball contacts the step surface of the damping hole to seal the damping hole; an actuator cylinder air inlet hole connected with the cylinder rodless chamber is provided on the integrated end cover, a valve shell is provided on the outer end surface of the integrated end cover, a pressure reducing valve hole is provided in the valve shell which passes through from top to bottom, and a connecting hole one connected with the actuator cylinder air inlet hole is provided in the pressure reducing valve hole; an air inlet is provided on one side end of the valve shell, a connecting hole two is provided between the air inlet and the pressure reducing valve hole, and a pressure reducing valve assembly which can reduce the pressure of the pressurized gas flowing into the air inlet is provided in the pressure reducing valve hole; The rodless cavity port of the cylinder is a stepped hole structure, and the stepped hole structure of the rodless cavity port includes an inner hole and an outer hole. The integrated end cover is provided with a threaded annular surface at the outer hole corresponding to the rodless cavity port of the cylinder, and the integrated end cover is provided with a sealing annular surface at the inner hole corresponding to the rodless cavity port of the cylinder, and the inner end of the sealing annular surface on the integrated end cover is provided with an annular groove surface that matches the clearance of the inner wall of the cylinder; the damping hole is opened at the position of the annular groove surface, and an exhaust notch is opened on the step surface where the damping hole and the steel ball are sealed; the inner end surface of the integrated end cover is provided with a weight reduction hole, and the air inlet hole of the actuator is connected to the weight reduction hole.

2. A push actuator with a high reliability pressure reducing valve according to claim 1, characterized in that: The pressure reducing valve assembly comprises an upper plugging cap fixedly provided on the upper end of the pressure reducing valve hole, a valve seat, a sealing seat and a spacer ring are sealed and fixedly nested in the pressure reducing valve hole below the upper plugging cap in sequence, a valve guide hole which is through-through and in the shape of a stepped hole is provided in the valve seat, a pressure reducing valve in the shape of a stepped shaft is slidably nested in the valve guide hole, a limiting truncated cone which can abut against the second shaft shoulder at the lower end of the pressure reducing valve is provided on the step surface of the valve guide hole; a vent hole 1 which is connected to the second connecting hole is provided on the side wall at the bottom of the valve seat; a valve guide hole is provided in the pressure reducing valve There is a vent hole two that runs through from top to bottom, a spring seat one is abutted against the top of the pressure reducing valve, and a spring one is arranged between the spring seat one and the top wall inside the upper plugging cap; the sealing seat is an inverted step shaft structure, and the sealing seat is provided with a step hole-shaped air hole along its axial direction, and the outer step surface of the sealing seat is a conical surface, and the conical surface is provided with a plurality of vent holes three that are inclined and perpendicular to its conical surface, and the air holes are connected with the air inlet port of the connecting hole one through the vent hole three; the hollow convex shaft at the bottom of the sealing seat is a positioning convex shaft, and the positioning convex shaft slides inside A push rod is embedded in the movable nest, and the length of the push rod is greater than the length of the sealing seat; the central hole of the spacer ring is a positioning hole, and a plurality of vent holes four are opened on the spacer ring in the circumferential direction of the outer periphery of the positioning hole, the spacer ring is located at the lower side of the air inlet port of the connecting hole one, and the vent hole four is connected with the vent hole three; a lower shell is fixedly provided at the lower port of the pressure reducing valve hole, a lower plugging cap is fixedly provided at the bottom end of the lower shell, a spring seat two which can move up and down is provided inside the lower shell, and a spring two is provided between the lower plugging cap and the spring seat two, and the top end of the spring seat two is abutted against a base, The base is an inverted stepped shaft structure, a gasket is provided on the convex shaft at the lower end of the base, a diaphragm is provided between the gasket and the stepped surface of the base, and a clamping nut is threadedly connected to the lower end of the gasket on the convex shaft of the base; a pressure ring is provided on the outer edge of the bottom surface of the diaphragm, the bottom surface of the pressure ring abuts against the top surface of the lower shell body, and a step surface abutting against the outer edge of the top surface is provided at the position of the diaphragm in the valve shell; the upper end of the push rod abuts against the bottom end of the pressure reducing valve, the lower end of the push rod abuts against the top end of the base, and the elastic force of spring one is less than the elastic force of spring two.

3. A push actuator with a high reliability pressure reducing valve according to claim 2, characterized in that: A ball head rod 1 is provided on the top surface of the pressure reducing valve, and a hemispherical groove 1 matched with the ball head rod 1 is provided on the bottom surface of the spring seat 1; ball tops are provided on both the upper and lower ends of the top rod; a ball head rod 2 is provided on the top surface of the spring seat 2, and a hemispherical groove 2 matched with the ball head rod 2 is provided on the bottom surface of the convex shaft at the lower end of the base.

4. A push actuator with a high reliability pressure reducing valve according to claim 1, characterized in that: The exhaust groove unit includes an exhaust groove 1 provided on the end face of the rod cavity of the cylinder, the rod cavity port of the cylinder is a stepped hole structure, the stepped hole structure of the rod cavity port includes an inner hole and an outer hole, the outer hole and the inner hole of the rod cavity port of the cylinder are respectively provided with an exhaust groove 2 and an exhaust groove 3, and the positions of the exhaust groove 2 and the exhaust groove 3 correspond to those of the exhaust groove 1; a mounting platform with a conical structure is symmetrically provided on the outer wall of the cylinder, and a mounting hole is provided on the axial end face of the outer side of the mounting platform.

5. The push actuator with a high reliability pressure reducing valve according to claim 1, characterized in that: A safety valve square platform protruding outward is also provided on the outer wall of the valve shell, and a safety valve port is opened on the safety valve square platform. A connecting hole three is opened in the valve shell between the safety valve port and the pressure reducing valve hole, and the safety valve port is connected to a safety valve assembly.

6. A push actuator with a high reliability pressure reducing valve according to claim 5, characterized in that: The safety valve assembly includes a safety valve housing sealed with the safety valve port, a step hole is provided in the safety valve housing along its axial direction, a safety valve valve is provided at the step surface of the step hole in the safety valve housing, a safety valve plugging cap is provided at the end of the safety valve housing, a spring seat three is provided at the inner end of the safety valve plugging cap, and a spring three is provided between the spring seat three and the safety valve valve; an exhaust hole is provided on the side wall of the safety valve housing at the outer hole of the step hole; the connecting hole three is communicated with the air inlet port of the connecting hole one in the pressure reducing valve hole.

7. The push actuator with a high reliability pressure reducing valve according to claim 1, characterized in that: The air inlet is connected to an air inlet connector, and the internal cavity of the air inlet connector is a stepped hole structure. The inner hole of the internal cavity of the air inlet connector is provided with a short filter element, and the short filter element includes a filter element base body 1, and an annular groove is provided on the outer end face of the filter element base body 1, and filter screen 1 and filter screen 2 are provided in sequence in the annular groove, and a filter element gasket ring is provided on the circumferential edge of the outer end of the filter screen 2; a plurality of air holes 1 are provided on the filter element base body 1 in the area corresponding to the annular groove.

8. The push actuator with a high reliability pressure reducing valve according to claim 7, characterized in that: A long filter element is also provided inside the air inlet joint and located inside the short filter element. The long filter element includes a filter element substrate 2. The filter element substrate 2 is a hollow sleeve structure and is arranged along the axial direction of the air inlet joint. The outer end of the filter element substrate 2 is a closed structure, and the inner open end of the filter element substrate 2 corresponds to the position of the connecting hole 2. A plurality of air holes 2 are opened on the circumferential outer wall of the filter element substrate 2, and a filter screen 3 is wrapped in the area corresponding to the air holes 2 on the circumferential outer wall of the filter element substrate 2. A boss is provided on the inner end face of the filter element base body one, the boss of the short filter element abuts against the closed end face of the filter element base body two, and the outer end face of the filter element base body one abuts against the step surface in the air inlet joint; a shaft shoulder one is provided on the inner end of the filter element base body two, an annular groove matching the shaft shoulder one is provided on the inner end face of the air inlet joint, the shaft shoulder one is nested in the annular groove of the air inlet joint, and a step surface abutting against the shaft shoulder one is provided at the position of the air inlet port of the connecting hole two in the valve housing.

9. The push actuator with a high reliability pressure reducing valve according to claim 2, characterized in that: A plurality of ventilation grooves are provided in the circumferential direction of the bottom surface of the limiting truncated cone; a sealing ring groove is provided in the bottom surface of the pressure reducing valve, and a sealing ring gasket is provided in the sealing ring groove.

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