Pushing actuator cylinder with high-reliability pressure reducing valve

Abstract

The pushing actuator cylinder comprises a piston rod arranged in a cylinder barrel, and a guide sleeve and an integrated end cover are fixedly arranged at the two ends of the cylinder barrel respectively; an exhaust groove unit used for exhausting of the rod cavity of the cylinder barrel is formed in the inner wall of the end opening of the rod cavity of the cylinder barrel. A damping hole is formed in the inner wall of the rodless cavity of the cylinder barrel in the radial direction, a steel ball is arranged in the damping hole, and the damping hole is sealed when the steel ball makes contact with the step face of the damping hole. The integrated end cover is provided with an actuator cylinder air inlet hole communicated with a rodless cavity of the cylinder barrel, a valve shell is arranged on the end face of the outer side of the integrated end cover, a pressure reducing valve hole communicated with the actuator cylinder air inlet hole is formed in the valve shell, and a pressure reducing valve assembly is arranged in the pressure reducing valve hole. Pressure and flow loss of a gas path connector and a pipeline are reduced, and installation space is saved; and the actuating cylinder is sensitive and rapid in response, stable in operation, safe and reliable and the like.

Description

Technical Field

[0001] The invention relates to the technical field of actuators, in particular to a push actuator with a high-reliability pressure reducing valve. Background Art

[0002] Actuators are used in various fields as a conversion actuator. Pneumatic actuators have the advantages of simple structure, fast response, low cost, high reliability, etc. However, when used in the aviation field, high-pressure gas cylinders are generally used as the power source. When working, the rapid release of the high-pressure gas source will produce a large movement impact on the actuator and the actuator. The pneumatic actuators currently used in the aviation field generally reduce the cylinder diameter and increase the buffer to solve the impact problem; Patent Publication No. CN203770288U discloses a pneumatic actuator, which specifically discloses a buffer device provided at the inlet end of the piston rod, which absorbs the kinetic energy of the piston through the buffer device, so that the inertia of the piston is buffered; but if the buffer fails or the parts are damaged after long-term use, the complex high-pressure gas working pipeline needs to be carefully checked, otherwise it will cause safety hazards.

[0003] Therefore, it is necessary to add a separate pressure reducing valve in the pipeline connection, which can reduce the pressure of the working gas when in use, and can reduce the potential safety hazards of air pressure work. However, after the pressurized gas is reduced in pressure by the external pressure reducing valve, not only the energy of the air pressure source in the pipeline will be lost, but the gas flow rate will also drop sharply. When the actuator is working, the output load will be smaller, and the structure is complex and occupies a large space, which cannot meet the space requirements; the gas flow through the pressure reducing valve assembly cannot be guaranteed while reducing the pressure, and thus the output force of the actuator cannot be guaranteed; the actuator has slow response speed and 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 push actuator with a high-reliability pressure reducing valve. The pressure reducing valve and the safety valve are integrated into an integrated structure with the actuator, and the modular structural design is more compact; the pressure and flow losses of the gas circuit interface and the pipeline are reduced, saving installation space; the impact on the entire interior of the actuator is reduced, and the gas flow through the pressure reducing valve assembly is guaranteed while reducing the pressure, thereby ensuring the output force of the actuator; the actuator is sensitive and quick to react, has a fast response speed, operates stably, safely and reliably, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a push actuator with a high-reliability pressure reducing valve, comprising a piston rod arranged in a cylinder, the rod chamber port and the rodless chamber port of the cylinder are respectively fixed with guide sleeves and integrated end covers, the telescopic end of the piston rod passes through the guide sleeve and is fixed with a push joint, a return spring is arranged on the piston rod between its piston ring and the guide sleeve; an exhaust groove unit for exhausting the rod chamber of the cylinder is arranged on the inner wall at the rod chamber port of the cylinder; a damping hole is arranged on the inner wall of the rodless chamber of the cylinder along its radial direction, and the damping hole is a multi-layer A step hole structure is provided, and a steel ball is arranged in the damping hole. When the steel ball contacts the step surface of the damping hole, a one-way damping valve is formed to seal the damping hole. An actuator cylinder air inlet hole connected with the rodless chamber of the cylinder 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 which passes through from top to bottom is provided in the valve shell, 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.

[0006] Furthermore, the pressure reducing valve assembly includes 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 sequence in the pressure reducing valve hole below the upper plugging cap, 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 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 one which is connected to the second connecting hole is provided on the side wall at the bottom of the valve seat; the pressure reducing valve A vent hole 2 is provided in the valve, which is connected from top to bottom. A spring seat 1 is abutted against the top of the pressure reducing valve. A spring 1 is provided between the spring seat 1 and the top wall of the upper plugging cap. The sealing seat is an inverted step shaft structure. The sealing seat is provided with a step hole-shaped air hole along its axial direction. The outer step surface of the sealing seat is a conical surface. The conical surface is provided with a plurality of vent holes 3 which are inclined and perpendicular to the conical surface. The air holes are connected with the air inlet port of the connecting hole 1 through the vent hole 3. The hollow convex shaft at the bottom of the sealing seat is a positioning convex shaft. The positioning convex shaft A push rod is slidably nested in the shaft, 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 ventilation 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 ventilation hole four is connected with the ventilation hole three; a lower shell is fixedly provided at the lower port of the pressure reducing valve hole, a lower blocking 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 blocking cap and the spring seat two, and the top end of the spring seat two 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 step 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.

[0007] Furthermore, a ball head rod 1 is provided on the top surface of the pressure reducing valve, and a hemispherical groove 1 which matches 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 which matches the ball head rod 2 is provided on the bottom surface of the convex shaft at the lower end of the base.

[0008] Furthermore, the exhaust groove unit includes an exhaust groove 1 on the end face of the rod cavity of the cylinder, the rod cavity port of the cylinder is a step hole structure, the outer hole and inner hole of the rod cavity port of the cylinder are respectively provided with exhaust groove 2 and exhaust groove 3, and the positions of exhaust groove 2 and exhaust groove 3 correspond to those of 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.

[0009] Furthermore, the rodless cavity port of the cylinder is a stepped hole structure, the integrated end cover is provided with a threaded annular surface at the outer hole of the corresponding cylinder rodless cavity port, the integrated end cover is provided with a sealing annular surface at the inner hole of the corresponding cylinder rodless cavity port, and the integrated end cover is provided with an annular groove surface that matches the clearance with the inner wall of the cylinder at the inner end of the sealing annular surface; 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 face of the integrated end cover is provided with a weight reduction hole, and the actuator cylinder air inlet hole is connected to the weight reduction hole.

[0010] Furthermore, a safety valve square platform protruding outward is provided on the outer wall of the valve shell, and a safety valve port is provided on the safety valve square platform. A connecting hole three is provided 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.

[0011] Furthermore, 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 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 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 connected to the air inlet port of the connecting hole one in the pressure reducing valve hole.

[0012] Furthermore, an air inlet connector is connected to the air inlet port, 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 the annular groove in sequence, and a filter element gasket ring is provided on the circumferential edge of the outer end of 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.

[0013] Furthermore, a long filter element is 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 provided 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 shoulder is provided on the inner end of the filter element base body two, an annular groove matching the shoulder is provided on the inner end face of the air inlet joint, the shoulder is nested in the annular groove of the air inlet joint, and a step surface abutting against the shoulder is provided at the position of the air inlet port of the connecting hole two in the valve housing.

[0014] Furthermore, 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 on the bottom surface of the pressure reducing valve, and a sealing ring gasket is provided in the sealing ring groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the push actuator with a high-reliability pressure-reducing valve installs the pressure-reducing valve assembly and the safety valve assembly in the valve housing of the integrated end cover, so that the pressure-reducing valve and the safety valve are integrated into an integrated structure with the actuator, and the structural modular design is more compact; the pressure and flow losses of the gas circuit interface and pipeline are reduced, and the installation space is saved; the pressure-reducing valve assembly on the actuator reduces the pressurized gas to the required pressure, reduces the impact on the entire interior of the actuator, and ensures the gas flow through the pressure-reducing valve assembly while reducing the pressure, thereby ensuring the output force of the actuator; the pressure-reducing valve assembly 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 ensures that the working air pressure will not be higher than the set safety pressure, thereby ensuring that the actuator works safely and reliably; the airflow is filtered by the short filter element and the long filter element provided inside the air inlet joint, thereby further ensuring the working stability of the pressure-reducing valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 A top view of the actuator of the present invention; Figure 3 This is a schematic diagram of the internal structure of the integrated end cover of the present invention; Figure 4 It is a cross-sectional view of the integrated end cover of the present invention located at the pressure reducing valve assembly; Figure 5 for Figure 3 A partial enlarged view of the pressure relief valve; Figure 6 for Figure 3 A partial enlarged view of the lower shell; Figure 7 It is a schematic diagram of the structure of the pressure reducing valve assembly of the present invention; Figure 8 It is a schematic diagram of the structure of the valve seat of the present invention; Fig. 9 A bottom view of the valve seat of the present invention; Fig.10 This is a schematic diagram of the structure of the pressure reducing valve of the present invention; Fig.11 This is a structural schematic diagram of a spring seat of the present invention; Fig.12 This is a schematic diagram of the sealing seat structure of the present invention; Fig.13 It is a schematic diagram of the structure of the spacer ring of the present invention; Fig.14A top view of the spacer ring of the present invention; Fig.15 This is a schematic diagram of the base structure of the present invention; Fig.16 This is a schematic diagram of the structure of the spring seat 2 of the present invention; Fig.17 A top view of the integrated end cover of the present invention; Fig.18 This is a schematic diagram of the safety valve housing structure of the present invention; Fig.19 This is a cross-sectional view of the valve housing of the present invention located at the safety valve assembly; Fig. 20 It is a schematic diagram of the short filter structure of the present invention; Fig.21 A side view of the filter element substrate of the present invention; Fig. 22 It is a schematic diagram of the long filter element structure of the present invention; Fig.23 It is a cross-sectional view of the cylinder of the present invention; Fig.24 It is a partial enlarged view of the cylinder of the present invention; Fig.25 for Fig.23 A partial enlarged view of the damping hole; Fig.26 It is a bottom view of the damping hole of the present invention.

[0017] In the figure: 1. Cylinder barrel; 101. Exhaust groove 1; 102. Exhaust groove 2; 103. Exhaust groove 3; 104. Damping hole; 105. Exhaust notch; 106. Mounting platform; 2. Piston rod; 21. Push joint; 3. Guide sleeve; 4. Return spring; 5. Integrated end cover; 51. Weight reduction hole; 52. Ring groove surface; 53. Sealing ring surface; 54. Threaded ring surface; 55. Air inlet hole of actuator; 56. Valve housing; 57. Pressure reducing valve hole; 58. Connecting hole 1; 59. Air inlet; 510. Connecting hole 2; 511. Safety valve square platform; 512. Safety valve port; 513. Connecting hole 3; 6. Air inlet connector; 61. Short filter element; 611. Filter element base 1; 612. Filter screen 1; 613. Filter screen 2; 614. Filter element gasket; 615. Air vent 1; 616. Boss; 62. Long filter element; 621. Filter element base 2; 622. Air vent 2; 623. Filter screen 3; 624. Shoulder 1; 7. Pressure reducing valve assembly; 71. Upper plug cap; 72. Spring 1; 73. Spring seat 1; 731. Hemispherical groove 1; 74. Valve seat; 741. Valve guide hole; 742. Limiting cone; 743. Vent 1; 744. Vent groove; 75. Pressure reducing valve; 751. Vent 2; 752. Sealing ring gasket; 753. Ball head rod 1; 754. Shoulder 2; 76. Sealing seat; 761. Vent; 762. Vent Hole three; 763, positioning cam; 77, spacer ring; 771, positioning hole; 772, vent hole four; 78, ejector rod; 781, ball top; 79, diaphragm; 710, base; 7101, hemispherical groove two; 711, gasket; 712, pressure ring; 713, clamping nut; 714, spring seat two; 7141, ball head rod two; 715, lower shell; 716, spring two; 717, lower plug cap; 718, back tightening nut one; 8. Safety valve assembly; 81. Safety valve housing; 811. Exhaust hole; 82. Safety valve plugging cap; 83. Spring seat three; 84. Spring three; 85. Tightening nut two; 86. Safety valve valve; 9. Steel ball. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0019] See also Figure 1-26 The present invention provides a technical solution: a push actuator with a high-reliability pressure reducing valve, comprising a piston rod 2 arranged in a cylinder 1, a rod cavity port and a rodless cavity port of the cylinder 1 are respectively fixedly provided with a guide sleeve 3 and an integrated end cover 5, the telescopic end of the piston rod 2 passes through the guide sleeve 3 and is fixedly provided with a push joint 21, and a return spring 4 is arranged on the piston rod 2 between its piston ring and the guide sleeve 3; an exhaust groove unit for exhausting the rod cavity of the cylinder 1 is provided on the inner wall at the rod cavity port of the cylinder 1; the exhaust groove unit comprises an exhaust groove 101 arranged on the end surface of the rod cavity of the cylinder 1, the rod cavity port of the cylinder 1 is a step hole structure, and an exhaust groove 2 102 and an exhaust groove 3 103 are respectively arranged on the outer hole and the inner hole of the rod cavity port of the cylinder 1, and the exhaust groove 2 102 and the exhaust groove 3 103 correspond to the position of the exhaust groove 1 101; the setting of the exhaust groove unit can not only ensure that the air inlet and outlet of the rod cavity of the cylinder 1 are not blocked, but also prevent a large amount of dust or impurities from entering from the air inlet and outlet; The outer wall of the cylinder 1 is symmetrically provided with a mounting platform 106 of a frustum structure, and a mounting hole is opened on the axial end surface outside the mounting platform 106; the actuator as a whole is hinged to the external support member through the mounting platform 106; The rodless cavity port of the cylinder barrel 1 is a stepped hole structure, the integrated end cover 5 is provided with a threaded annular surface 54 at the outer hole corresponding to the rodless cavity port of the cylinder barrel 1, the integrated end cover 5 is provided with a sealing annular surface 53 at the inner hole corresponding to the rodless cavity port of the cylinder barrel 1, and the inner side end of the sealing annular surface 53 on the integrated end cover 5 is provided with an annular groove surface 52 that matches the inner wall gap of the cylinder barrel 1; A damping hole 104 is provided on the inner wall of the rodless cavity of the cylinder 1 along its radial direction. The damping hole 104 is a multi-layer step hole structure, and a steel ball 9 is provided in the damping hole 104. When the steel ball 9 contacts the step 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 annular groove surface 52, and an exhaust notch 105 is provided on the step surface where the damping hole 104 and the steel ball 9 are sealed in contact. The inner end surface of the integrated end cover 5 is provided with a weight-reducing hole 51 connected to the rodless chamber of the cylinder 1; the integrated end cover 5 is provided with an actuator air inlet hole 55 connected to the weight-reducing hole 51, and the outer end surface of the integrated end cover 5 is provided with a valve housing 56, and a pressure-reducing valve hole 57 extending vertically is provided in the valve housing 56, and a connecting hole 1 58 connected to the actuator air inlet hole 55 is provided in the pressure-reducing valve hole 57; an air inlet port 59 is provided at one side end of the valve housing 56, and a connecting hole 2 510 is provided between the air inlet port 59 and the pressure-reducing valve hole 57, and a pressure-reducing valve assembly 7 capable of reducing the pressure of the pressurized gas flowing into the air inlet port 59 is provided in the pressure-reducing valve hole 57; the air inlet port 59 is connected with an air inlet joint 6; The pressure reducing valve assembly 7 comprises an upper plugging cap 71 fixedly provided at the upper end of the pressure reducing valve hole 57, a valve seat 74, a sealing seat 76 and a spacer ring 77 are sealed and fixedly nested in sequence below the upper plugging cap 71 in the pressure reducing valve hole 57, a valve guide hole 741 which is through-through and in the shape of a stepped hole is provided in the valve seat 74, a pressure reducing valve 75 in the shape of a stepped shaft is slidably nested in the valve guide hole 741, a limiting truncated cone 742 which can abut against the lower end shoulder 754 of the pressure reducing valve 75 is provided on the step surface of the valve guide hole 741; a vent hole 743 which is connected to the second connecting hole 510 is provided on the side wall at the bottom of the valve seat 74; a vent hole 751 which is through-through and in the pressure reducing valve 75 is provided in the pressure reducing valve 75, and a spring seat 73 abuts against the top of the pressure reducing valve 75, A spring 72 is provided between the spring seat 73 and the inner top wall of the upper plugging cap 71; the sealing seat 76 is an inverted stepped shaft structure, and the sealing seat 76 is provided with a stepped hole-shaped air hole 761 along its axial direction, and the outer step surface of the sealing seat 76 is a conical surface, and the conical surface is provided with a plurality of inclined air holes 762 which are perpendicular to its conical surface, and the air hole 761 is connected to the air inlet port of the connecting hole 58 through the air holes 762, and the plurality of inclined air holes 762 can maximize the air flow while reducing the layout space; the hollow convex shaft at the bottom of the sealing seat 76 is a positioning convex shaft 763, and a push rod 78 is slidably embedded 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 spacer ring 77 The center hole is a positioning hole 771, and a plurality of ventilation holes 772 are opened on the spacer ring 77 in the circumferential direction of the periphery of the positioning hole 771. The spacer ring 77 is located at the lower side of the air inlet port of the connecting hole 58, and the ventilation hole 772 is communicated with the ventilation hole 762; the lower port of the pressure reducing valve hole 57 is fixedly provided with a lower shell body 715, and the bottom end of the lower shell body 715 is fixedly provided with a lower blocking cap 717, the lower blocking cap 717 is threadedly connected to the circumferential inner wall of the lower shell body 715, and a back-tightening nut 718 is provided on the circumferential outer wall of the lower blocking cap 717, a spring seat 714 which can move up and down is provided inside the lower shell body 715, and a spring 716 is provided between the lower blocking cap 717 and the spring seat 714, and the top end of the spring seat 714 abuts against a base 710, and the base 710 is An inverted stepped shaft structure, 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 portion below the spacer ring 77 in the pressure reducing valve hole 57, and a clamping nut 713 is threadedly connected to the lower end of the gasket 711 on the convex shaft of the base 710; a pressure ring 712 is provided on the outer edge of the bottom surface of the diaphragm 79, the bottom surface of the pressure ring 712 abuts against the top surface of the lower shell body 715, and a stepped surface abutting 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, the lower end of the push rod 78 abuts against the top end of the base 710, and the elastic force of the spring 1 72 is less than the elastic force of the spring 2 716.

[0020] The outer wall of the valve housing 56 is also provided with a safety valve square platform 511 protruding outward, and the safety valve square platform 511 is provided with a safety valve port 512. A connecting hole 3 513 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 to the safety valve assembly 8; the safety valve assembly 8 includes a safety valve housing 81 sealedly connected to the safety valve port 512, a step hole is provided in the safety valve housing 81 along its axial direction, and a step surface of the step hole is provided in the safety valve housing 81 A safety valve valve 86, a safety valve cap 82 is threadedly connected to the end of the outer wall of the safety valve housing 81, a tightening nut 85 for tightening the safety valve cap 82 is provided on the safety valve housing 81, a spring seat 83 is provided at the inner end of the safety valve cap 82, and a spring 84 is provided between the spring seat 83 and the safety valve valve 86; an exhaust hole 811 is opened on the side wall of the safety valve housing 81 at the outer hole of the step hole; the connecting hole 3 513 is communicated with the air inlet port of the connecting hole 1 58 in the pressure reducing valve hole 57.

[0021] Working principle: When the air source is not connected, since the elastic force of the spring 1 72 is smaller than the elastic force of the spring 2 716, the pressure relief valve 75 is pushed upward by the push rod 78, the shaft shoulder 2 754 of the pressure relief valve 75 abuts against the limiting round table 742 of the valve seat 74, and a gap is left between the pressure relief valve 75 and the sealing seat 76, and the pressure relief valve assembly 7 is in the open state; During operation, the gas source provides pressurized gas to the pressure reducing valve hole 57 through the air inlet joint 6, and the pressurized gas enters the valve seat 74 through the connecting hole 2 510 and the vent hole 1 743. The gas passes through the gap between the pressure reducing valve 75 and the sealing seat 76 for stable pressure reduction. The decompressed gas passes through the air hole 761, the vent hole 3 762, the connecting hole 1 58 and the actuator air inlet hole 55 and enters the rodless cavity of the cylinder 1. The gas pushes the piston rod 2 to extend rapidly out of the cylinder 1 in the direction of the rod cavity. During operation, a portion of the decompressed gas flows upward through the second vent hole 751 on the decompression valve 75, and the other portion of the gas flows downward through the third vent hole 762 of the sealing seat 76 and the fourth vent hole 772 of the spacer ring 77. Since the diaphragm 79 seals the portion below the spacer ring 77 in the decompression valve hole 57, the pressure of the gas working chamber above the diaphragm 79 in the decompression valve hole 57 is the same. When the gas pressure provided by the gas source is greater than the elastic force applied by the second spring 716 to the second spring seat 714, the pressurized gas in the decompression valve hole 57 pushes the diaphragm 79 to bend downward, the spring 1 72 applies an elastic force to the spring seat 1 73, and the spring seat 1 73 pushes the decompression valve 75 and the push rod 78 to move downward, reducing the pressure between the decompression valve 75 and the seal. The ventilation cross-sectional area between the sealing seat 76 is increased, thereby reducing the gas pressure entering the air hole 761 again; when the gas pressure provided by the gas source is less than the elastic force applied by the spring 2 716 to the spring seat 2 714, the elastic force applied by the spring 2 716 to the spring seat 2 714 restores the diaphragm 79 to its original state, and the base 710 pushes the push rod 78 and the pressure reducing valve 75 to move upward, increasing the ventilation cross-sectional area between the pressure reducing valve 75 and the sealing seat 76, thereby increasing the gas pressure entering the air hole 761; the elastic force applied by the spring 1 72 to the spring seat 1 73 and the elastic force applied by the spring 2 716 to the spring seat 2 714 automatically adjusts the output pressure of the gas, thereby ensuring the stability of the output pressure after pressure reduction, thereby improving the working reliability of the pressure reducing valve assembly 7.

[0022] During the extension of the piston rod 2, the gas in the rodless chamber of the cylinder barrel 1 flows toward the damping hole 104 through the annular groove surface 52 of the integrated end cover 5, and 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 actuator is pushed out, the air intake flow of the rodless chamber of the cylinder barrel 1 is much greater than the air outlet flow of the exhaust notch 105, and the action is rapid, which can be regarded as the damping hole 104 and the steel ball 9 are sealed; at the same time, the gas in the rod chamber of the cylinder barrel 1 is discharged through the exhaust groove 3 103, the exhaust groove 2 102 and the exhaust groove 1 101, so as to realize the rapid pushing function of the piston rod 2; After the pushing action of the actuator is completed, the air source stops supplying air, and the gas in the rodless chamber of the cylinder 1 is slowly released through the damping hole 104, and the return spring 4 applies elastic force to the piston rod 2 to restore it to its original state; When the integrated end cover 5 encounters unexpected situations such as overpressure or blockage, the internal air pressure flows to the safety valve port 512 through the connecting hole 3 513, and the air flow pushes open the safety valve valve 86 and is discharged into the atmosphere from the exhaust hole 811, so that the working air pressure will not be higher than the set safety pressure, ensuring that the actuator can operate safely and reliably.

[0023] Furthermore, a ball head rod 753 is provided on the top surface of the pressure reducing valve 75, and a hemispherical groove 731 matched with the ball head rod 753 is provided on the bottom surface of the spring seat 73; a ball top 781 is provided on both the upper and lower ends of the push rod 78; a ball head rod 7141 is provided on the top surface of the spring seat 714, and a hemispherical groove 7101 matched with the ball head rod 7141 is provided on the bottom surface of the convex shaft at the lower end of the base 710; spherical point contacts are formed between the pressure reducing valve 75 and the spring seat 73, between the push rod 78 and the pressure reducing valve 75, between the push rod 78 and the base 710, and between the base 710 and the 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, stable and reliable operation, etc.

[0024] Furthermore, the internal cavity of the air inlet connector 6 is a stepped hole structure, and the inner hole of the internal cavity of the air inlet connector 6 is provided with a short filter element 61, and the short filter element 61 includes a filter element base 1 611, and the outer end surface of the filter element base 1 611 is provided with an annular groove, and a filter screen 1 612 and a filter screen 2 613 are provided in the annular groove in sequence, and a filter element gasket ring 614 is provided on the circumferential edge of the outer end of the filter screen 2 613; a plurality of air holes are provided on the filter element base 1 611 in the area corresponding to the annular groove A long filter element 62 is also provided inside the air inlet connector 6, and the long filter element 62 includes a filter element base 621, which is a hollow sleeve structure and is arranged along the axial direction of the air inlet connector 6. The outer end of the filter element base 621 is a closed structure, and the inner open end of the filter element base 621 corresponds to the position of the connecting hole 510; a plurality of air holes 622 are opened on the circumferential outer wall of the filter element base 621, and The area on the outer circumferential wall of the second filter element base 621 corresponding to the second air vent 622 is wrapped with a filter screen 3 623; the inner end face of the filter element base 1 611 is provided with a boss 616, the boss 616 of the short filter element 61 abuts against the closed end face of the second filter element base 621, and the outer end face of the filter element base 1 611 abuts against the step surface in the air inlet connector 6; the inner end of the filter element base 2 621 is provided with a shaft shoulder 1 624, and the inner end face of the air inlet connector 6 is opened. An annular groove matched with the shaft shoulder 624 is provided, and the shaft shoulder 624 is nested in the annular groove of the air inlet connector 6, and a step surface abutting against the shaft shoulder 624 is provided at the position of the air inlet port of the connecting hole 2 510 in the valve housing 56; the airflow entering from the air inlet connector 6 is secondary filtered by the short filter element 61 and the long filter element 62 provided in the air inlet connector 6, and the airflow filtering accuracy is high. The short filter element 61 and the long filter element 62 have a simple and compact structure, a reasonable layout, and are easy to disassemble and assemble.

[0025] Furthermore, a plurality of ventilation grooves 744 are provided in the circumferential direction of the bottom surface of the limiting cone 742, and the ventilation grooves 744 prevent the shoulder 2 754 of the decompression valve 75 from fitting too tightly with the limiting cone 742 of the valve seat 74, thereby affecting the response speed of the decompression valve 75; a sealing ring groove is provided on the bottom surface of the decompression valve 75, and a sealing ring gasket 752 is provided in the sealing ring groove.

[0026] The push actuator with a high-reliability 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 cover 5, so that the pressure-reducing valve and the actuator are integrated into an integrated structure, and the modular structural design is more compact; the pressure and flow losses of the air circuit interface and pipeline are reduced, and the installation space is saved; the pressure-reducing valve assembly 7 on the actuator reduces the pressurized gas to the required pressure, reduces the impact of the piston rod 2 on the cylinder 1, reduces the impact on the entire interior of the actuator, and ensures 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 will not be higher than the set safety pressure, thereby ensuring that the actuator works safely and reliably; the air flow is filtered by the short filter element 61 and the long filter element 62 provided inside the air inlet joint 6, further ensuring the working stability of the pressure-reducing valve assembly 7.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 rod chamber port and a rodless chamber port of the cylinder being respectively fixed with a guide sleeve and an integrated end cover, a telescopic end of the piston rod passing through the guide sleeve and being fixed 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 rod chamber port of the cylinder; a damping hole is provided on the inner wall of the rodless chamber of the cylinder along its radial direction, and 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 to the rodless chamber of the cylinder is provided on the integrated end cover, and a valve shell is provided on the outer end surface of the integrated end cover, and a pressure reducing valve hole is provided in the valve shell which passes through from top to bottom, and a connecting hole 1 connected to 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, and a connecting hole 2 is provided between the air inlet and the pressure reducing valve hole, and a pressure reducing valve assembly is provided in the pressure reducing valve hole for reducing the pressure of the pressure gas flowing into the air inlet.

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 on the end face of the rod cavity of the cylinder, the rod cavity port of the cylinder is a step hole structure, the outer hole and the inner hole of the rod cavity port of the cylinder are respectively provided with exhaust groove 2 and exhaust groove 3, and the positions of exhaust groove 2 and exhaust groove 3 correspond to those of 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: The rodless cavity port of the cylinder is a stepped hole structure, and the integrated end cover is provided with a threaded annular surface at the outer hole of the corresponding cylinder rodless cavity port, and the integrated end cover is provided with a sealing annular surface at the inner hole of the corresponding cylinder rodless cavity port, and the integrated end cover is provided with an annular groove surface that matches the clearance of the cylinder inner wall at the inner end of the sealing annular surface; 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 face of the integrated end cover is provided with a weight reduction hole, and the actuator cylinder air inlet hole is connected to the weight reduction hole.

6. 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.

7. A push actuator with a high reliability pressure reducing valve according to claim 6, 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.

8. 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.

9. A push actuator with a high reliability pressure reducing valve according to claim 8, 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.

10. 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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