Sealing side load applying device for hydraulic actuator

Abstract

The invention provides a sealing side load applying device for a hydraulic actuator. The sealing side load applying device comprises a bottom plate (1), a pin (2), a sliding block support (3), a nut (4), the hydraulic actuator (5), a pin shaft (6), a nut (7), a support (8), a clamping block (9), a clamping block (10), a pin (11), a coupling block (12), a torque sensor (13), a torsion loader (14) and a friction plate (15). When the hydraulic actuator (5) reciprocates, the torsion loader (14) generates torsion to drive the torque sensor (13), the coupling block (12), the clamping block (10), the pin shaft (6) and the clamping block (9) to rotate; the torque sensor (13) detects torque applied to the hydraulic actuator (5), and application of sealing side loads of different sizes can be achieved through adjustment of the torque and displacement of reciprocating motion. The device has a function of simulating a reciprocating motion side load effect of the hydraulic actuator, and can realize quantitative and controllable sealing side load loading of the hydraulic actuator.

Description

Technical Field

[0001] The invention belongs to hydraulic sealing technology, and in particular relates to a hydraulic actuator sealing side load applying device. Background Art

[0002] The hydraulic actuator is an important executive component in the aircraft flight control system. Its two ends are connected to the fuselage and the aircraft control surface respectively. It realizes reciprocating linear motion and power output under hydraulic drive. It is the support point and motion driving component of the aircraft wing surface.

[0003] Common hydraulic actuators and aircraft structures are usually hinged at both ends. Ideally, the force or load is along the line connecting the two hinge points and coincides with the axis of the actuator piston rod. However, in actual working conditions, due to the manufacturing and assembly accuracy of the actuator, there are deviations and angles between the force and the piston rod axis, friction resistance at the hinge point, and gravity and inertia of the actuator itself. This will generate side loads perpendicular to the piston rod axis in the reciprocating motion structure of the actuator. This side load will cause the actuator structure to bend and torsion, and the reciprocating seal structure to bear eccentric loads, which will have a significant impact on the sealing performance and life of the actuator.

[0004] However, existing ground test devices for hydraulic actuators often lack the function of applying side loads, or the applied side loads cannot be dynamically adjusted and controlled, and cannot effectively simulate actual use conditions, which leads to insufficient seal verification and difficulty in ensuring product service quality. Therefore, a device that can dynamically and controllably apply side loads to the sealing structure of hydraulic actuators is needed to achieve more comprehensive and effective verification and evaluation of sealing characteristics. Summary of the invention

[0005] The invention provides a hydraulic actuator seal side load applying device, which has the function of simulating the reciprocating motion side load effect of the hydraulic actuator and can realize quantitative and controllable loading of the hydraulic actuator seal side load.

[0006] The present invention provides a hydraulic actuator sealing side load applying device, comprising: a base plate 1, a pin 2, a slider support 3, a nut 4, a hydraulic actuator 5, a pin shaft 6, a nut 7, a support 8, a clamping block 9, a clamping block 10, a pin 11, a coupling block 12, a torque sensor 13, a torque loader 14, and a friction plate 15; wherein:

[0007] The hydraulic actuator 5 is hinged to the slider support 3 through the pin 2 and fastened through the nut 4. The slider support 3 is connected to the bottom plate 1 and can freely move back and forth along a straight line.

[0008] The hydraulic actuator 5 is located between the clamping block 9 and the clamping block 10;

[0009] The end surfaces of the clamping blocks 9 and 10 facing the hydraulic actuator 5 are embedded with friction plates 15;

[0010] The pin 6 passes through the clamping block 10, the hydraulic actuator 5, and the clamping block 9 in sequence, and is fastened by the nut 7;

[0011] The clamping block 9 and the clamping block 10 are installed on the support 8, and the clamping block 9 and the clamping block 10 can rotate relative to the support 8;

[0012] The support 8 is fixedly connected to the base plate 1;

[0013] The coupling block 12 is coaxially connected to the clamping block 10 and is limited and prevented from falling off by the pin 11;

[0014] The torque sensor 13 is located between the coupling block 12 and the torque loader 14. The torque sensor 13 is connected to the coupling block 12 through a flange. The torque sensor 13 is connected to the torque loader 14 through a flange.

[0015] The torque loader 14 is fixedly connected to the base plate 1;

[0016] When the hydraulic actuator 5 performs reciprocating motion, the torque loader 14 generates torque, driving the torque sensor 13, the coupling block 12, the clamping block 10, the pin 6, and the clamping block 9 to rotate; the torque sensor 13 detects the torque applied to the hydraulic actuator 5, and the adjustment of the torque and the displacement of the reciprocating motion can achieve the application of sealing side loads of different sizes.

[0017] Optionally, there is a matching plane 16 between the pin 6 and the clamping block 9 , there is a matching plane 17 between the pin 6 and the clamping block 10 , and there is a matching plane 18 between the coupling block 12 and the clamping block 10 .

[0018] Optionally, the support 8 is a two-ear structure;

[0019] The clamping block 9 and the clamping block 10 are respectively sleeved in the holes of the two ear structures;

[0020] One end of the clamping block 10 is sleeved on the outside of the pin shaft 6 , and the other end is sleeved on the outside of the coupling block 12 .

[0021] Optionally, the two friction plates 15 are in contact with two side surfaces of the single ear structure of the hydraulic actuator 5;

[0022] Furthermore, the inner diameter of the friction plate 15 is larger than the outer diameter of the bearing in the single-ear structure of the hydraulic actuator 5 .

[0023] Optionally, the axes of the slider support 3 and the support 8 are parallel to each other and located on the same horizontal plane.

[0024] Optionally, the friction plate 15 is made of copper.

[0025] Optionally, the torque loader 14 is a torque motor.

[0026] Optionally, the hydraulic actuator 5 comprises: a cylinder 19, a piston head seal 20, a piston rod seal 21, and a piston rod 22, wherein:

[0027] The piston rod 22 is coaxial with the cylinder 19, and the piston rod 22 and the cylinder 19 reciprocate relative to each other;

[0028] The piston head seal 20 is installed in the sealing groove of the piston rod 22, and is in sealing contact and relative movement with the inner hole of the cylinder 19;

[0029] The piston rod seal 21 is installed in the sealing groove of the cylinder 19 and is in sealing contact with and moves relative to the outer circle of the piston rod 22.

[0030] The present invention provides a hydraulic actuator seal side load application device, which can realize on-demand quantitative and controllable loading of the hydraulic actuator seal side load by controlling the bending and torsion applied by the torque loader 14 and the reciprocating motion position of the hydraulic actuator 5, thereby realizing the simulation of the reciprocating motion side load effect of the hydraulic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a hydraulic actuator seal side load applying device of the present invention;

[0032] Figure 2 It is a cross-sectional view of a local connection structure of a hydraulic actuator of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the hydraulic actuator of the present invention;

[0034] Description of reference numerals:

[0035] Base plate-1, pin-2, slider support-3, nut-4, hydraulic actuator-5, pin shaft-6, nut-7, support-8, clamping block-9, clamping block-10, pin-11, coupling block-12, torque sensor-13, torque loader-14, friction plate 15, matching plane 16, matching plane 17, matching plane 18, cylinder-19, piston head seal-20, piston rod seal-21, piston rod-22. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention.

[0037] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1-3 As shown, the present invention provides a hydraulic actuator sealing side load applying device, comprising: a base plate 1, a pin 2, a slider support 3, a nut 4, a hydraulic actuator 5, a pin shaft 6, a nut 7, a support 8, a clamping block 9, a clamping block 10, a pin 11, a coupling block 12, a torque sensor 13, a torque loader 14, a friction plate 15, a matching plane 16, a matching plane 17, and a matching plane 18; wherein:

[0041] The hydraulic actuator 5 is hinged to the slider support 3 through the pin 2 and fastened by the nut 4;

[0042] The slider support 3 is connected to the bottom plate 1 and can freely move back and forth along a straight line;

[0043] The hydraulic actuator 5 is located between the clamping block 9 and the clamping block 10;

[0044] A friction plate 15 is installed between the hydraulic actuator 5 and the clamping block 9;

[0045] A friction plate 15 is installed between the hydraulic actuator 5 and the clamping block 10;

[0046] The pin 6 passes through the clamping block 10, the hydraulic actuator 5, and the clamping block 9 in sequence, and is fastened by the nut 7;

[0047] There is a matching plane 16 between the pin 6 and the clamping block 9;

[0048] There is a matching plane 17 between the pin 6 and the clamping block 10;

[0049] There is a matching plane 18 between the coupling block 12 and the clamping block 10;

[0050] The clamping block 9 and the clamping block 10 are installed on the support 8, and the clamping block 9 and the clamping block 10 can rotate relative to the support 8;

[0051] The support 8 is fixedly connected to the base plate 1;

[0052] The coupling block 12 is coaxially connected to the clamping block 10 and is limited and prevented from falling off by the pin 11;

[0053] The torque sensor 13 is located between the coupling block 12 and the torque loader 14. The torque sensor 13 is connected to the coupling block 12 through a flange. The torque sensor 13 is connected to the torque loader 14 through a flange.

[0054] The torque loader 14 is fixedly connected to the base plate 1;

[0055] The hydraulic actuator 5, the torque sensor 13, and the torque loader 14 have external connection interfaces;

[0056] The hydraulic actuator 5 comprises a cylinder 19, a piston head seal 20, a piston rod seal 21, and a piston rod 22, wherein:

[0057] The piston rod 22 is coaxial with the cylinder 19, and the piston rod 22 can reciprocate relative to the cylinder 19;

[0058] The piston head seal 20 is installed in the sealing groove of the piston rod 22, and is in sealing contact and relative movement with the inner hole of the cylinder 19;

[0059] The piston rod seal 21 is installed in the seal groove of the cylinder 19, and is in sealing contact and relative motion with the outer circle of the piston rod 22;

[0060] The torque loader 14 is specifically in the form of a torque motor, but is not limited to a torque motor, and may also be a driving device with controllable torque output to provide the torque required for loading.

[0061] The friction plate 15 is made of copper, but is not limited to copper. It can also be made of other friction materials with low hardness and high friction coefficient to ensure reliable friction torque transmission of the connection structure while avoiding scratches on other parts.

[0062] In the present invention, the sealing structure in the hydraulic actuator 5 includes a piston head seal 20 and a piston rod seal 21. Under ideal working conditions, the sealing structure is subjected to balanced forces, and the sealing contact force is symmetrical along the axis of the cylinder 19 and the piston rod 22. Under actual working conditions, due to factors such as fitting accuracy and hinge friction, equivalent bending and torsion may occur on the hydraulic actuator when the hydraulic actuator drives the load in reciprocating motion, causing the sealing surfaces of the piston head seal 20 and the piston rod seal 21 to be subjected to a side load force perpendicular to the axis of the cylinder 19 and the piston rod 22. The present invention provides a hydraulic actuator seal side load application device that can simulate this equivalent bending and torsion to achieve hydraulic actuator seal side load application.

[0063] like Figure 1 As shown, in the present invention, the hydraulic actuator 5 and the slider support 3 are hinged by the pin 2, and are tightened by the nut 4 at one end of the pin. The slider support 3 is installed on the base plate 1, and the slider support 3 can freely move back and forth along a straight line. The connection formed by the hydraulic actuator 5 and the slider support 3 can rotate freely and move back and forth freely in a straight line, and the connection end has no bending and twisting effect on the hydraulic actuator 5.

[0064] In the present invention, the hydraulic actuator 5 forms a fastening connection structure with the pin 6, the nut 7, the clamping block 9 and the clamping block 10. The pin 6 passes through the clamping block 10, the hydraulic actuator 5 and the clamping block 9 in sequence, and the end of the pin 6 is threadedly connected to the nut 7.

[0065] Among them, the cylindrical surface of the shaft of the pin shaft 6 has a milled flat surface, and the inner hole of the clamping block 9 has a corresponding matching plane. The pin shaft 6 and the clamping block 9 form a shaft hole match, and the matching contact part forms a matching plane 16 that fits each other. The matching plane 16 can limit the relative rotation of the pin shaft 6 and the clamping block 9. The cylindrical surface of the large end of the pin shaft 6 has a milled flat surface, and the inner hole of the clamping block 10 has a corresponding matching plane. The pin shaft 6 and the clamping block 10 form a shaft hole match, and the matching contact part forms a matching plane 17 that fits each other. The matching plane 17 can limit the relative rotation of the pin shaft 6 and the clamping block 10. The matching plane 16 and the matching plane 17 structure make the pin shaft 6, the clamping block 9, and the clamping block 10 form a non-rotatable connection.

[0066] After the end of the pin shaft 6 is threadedly connected and tightened with the nut 7, extrusion friction is formed between the hydraulic actuator 5 and the clamping block 9 and the clamping block 10 respectively, and the torque can be transmitted to the hydraulic actuator 5 by the clamping block 10 and the clamping block 9 through friction. Among them, a friction plate 15 is also installed between the hydraulic actuator 5 and the clamping block 9, and a friction plate 15 is installed between the hydraulic actuator 5 and the clamping block 10. The friction plate can ensure reliable and stable friction torque transmission while avoiding scratching other parts.

[0067] The clamping block 9 and the clamping block 10 are installed on the support 8 and can rotate freely relative to the support 8. The support 8 is fixedly connected to the base plate 1. The fastening connection structure formed by the hydraulic actuator 5, the pin 6, the nut 7, the clamping block 9, and the clamping block 10 cooperates with the support 8 to form a hinge with a fixed hinge point and can rotate relatively. The outer shafts of the clamping block 9 and the clamping block 10 both have a shoulder structure to limit axial movement.

[0068] In the present invention, the torque loader 14 is fixedly connected to the base plate 1, the torque loader 14 is fixedly connected to the torque sensor 13 through a flange, the torque sensor 13 is fixedly connected to the coupling block 12 through a flange, the coupling block 12 is coaxially docked with the clamping block 10, and is limited and prevented from falling off by the pin 11. Among them, the cylindrical surface of the shaft of the coupling block 12 has a milled flat surface, and the inner hole of the clamping block 10 has a corresponding matching plane. The coupling block 12 and the clamping block 10 form a mutually fitting matching plane 18 to limit relative rotation.

[0069] In the present invention, the torque loader 14 has an external connection interface, and can generate the required rotational torque through external control. The generated rotational torque is sequentially transmitted to the fastening connection structure formed by the pin 6, the nut 7, the clamping block 9, and the clamping block 10 through the torque sensor 13 and the coupling block 12, and then applied to the hydraulic actuator 5 through the friction plate 15, generating a bending moment on the hydraulic actuator 5. Among them, the torque sensor 13 can measure the applied torque as feedback for external control adjustment.

[0070] The hydraulic actuator 5 has an external connection interface. When a bending moment is applied to the hydraulic actuator 5 , the hydraulic actuator 5 can perform reciprocating linear motion through external control.

[0071] When the hydraulic actuator 5 is subjected to bending and torsion, the cylinder 19 and the piston head seal 20 will generate a side load interaction force perpendicular to the axial direction, and the piston rod 22 and the piston rod seal 21 will generate a side load interaction force perpendicular to the axis. At the same time, the hydraulic actuator 5 can be controlled to perform reciprocating linear motion, and the relative positions of the piston head seal 20 and the piston rod seal 21 can change. Under the structural constraints of this device, the hydraulic actuator can only reciprocate linearly and is always in torque balance. According to the definition of torque, the applied torque is proportional to the side load force perpendicular to the axial direction generated by the sealing part and the distance of the sealing part along the axial direction. Therefore, by using a hydraulic actuator seal side load application device of the present invention, by controlling the bending and torsion applied by the torque loader 14 and the reciprocating motion position of the hydraulic actuator 5, it is possible to achieve quantitative and controllable loading of the hydraulic actuator seal side load on demand, and to achieve simulation of the reciprocating motion side load effect of the hydraulic actuator.

[0072] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that the above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A hydraulic actuator seal side load applying device, characterized in that: include: Base plate (1), pin (2), slider support (3), nut (4), hydraulic actuator (5), pin shaft (6), nut (7), support (8), clamping block (9), clamping block (10), pin (11), coupling block (12), torque sensor (13), torque loader (14), friction plate (15); wherein: The hydraulic actuator (5) is hinged to the slider support (3) through a pin (2) and is fastened through a nut (4). The slider support (3) is connected to the base plate (1) and can freely move back and forth along a straight line. The hydraulic actuator (5) is located between the clamping block (9) and the clamping block (10); A friction plate (15) is embedded on the end surface of the clamping block (9) and the clamping block (10) facing the hydraulic actuator (5); The pin shaft (6) passes through the clamping block (10), the hydraulic actuator (5), and the clamping block (9) in sequence, and is fastened by a nut (7); The clamping block (9) and the clamping block (10) are installed on the support (8), and the clamping block (9) and the clamping block (10) can rotate relative to the support (8); The support (8) is fixedly connected to the base plate (1); The coupling block (12) and the clamping block (10) are coaxially connected and are prevented from falling off by limiting the position through the pin (11); The torque sensor (13) is located between the coupling block (12) and the torque loader (14), the torque sensor (13) and the coupling block (12) are connected via a flange, and the torque sensor (13) and the torque loader (14) are connected via a flange; The torque loader (14) is fixedly connected to the base plate (1); When the hydraulic actuator (5) performs reciprocating motion, the torque loader (14) generates torque, driving the torque sensor (13), the coupling block (12), the clamping block (10), the pin shaft (6), and the clamping block (9) to rotate; the torque sensor (13) detects the torque applied to the hydraulic actuator (5), and the adjustment of the torque and the displacement of the reciprocating motion can achieve the application of sealing side loads of different sizes.

2. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: A matching plane (16) is provided between the pin shaft (6) and the clamping block (9), a matching plane (17) is provided between the pin shaft (6) and the clamping block (10), and a matching plane (18) is provided between the coupling block (12) and the clamping block (10).

3. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: The support (8) is a two-ear structure; The clamping block (9) and the clamping block (10) are respectively sleeved in the holes of the two ear structures; One end of the clamping block (10) is sleeved on the outside of the pin shaft (6), and the other end is sleeved on the outside of the coupling block (12).

4. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: Two friction plates (15) are in contact with two side surfaces of the single ear structure of the hydraulic actuator (5); Furthermore, the inner diameter of the friction plate (15) is larger than the outer diameter of the bearing in the single-ear structure of the hydraulic actuator (5).

5. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: The axes of the slider support (3) and the support (8) are parallel to each other and are located on the same horizontal plane.

6. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: The friction plate (15) is made of copper.

7. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: The torque loader (14) is a torque motor.

8. The hydraulic actuator seal side load applying device according to claim 1, characterized in that: The hydraulic actuator (5) comprises: a cylinder (19), a piston head seal (20), a piston rod seal (21), and a piston rod (22), wherein: The piston rod (22) is coaxial with the cylinder (19), and the piston rod (22) and the cylinder (19) reciprocate relative to each other; The piston head seal (20) is installed in the sealing groove of the piston rod (22) and is in sealing contact with and relatively movable with the inner hole of the cylinder (19); The piston rod seal (21) is installed in the sealing groove of the cylinder (19) and is in sealing contact with and relatively moving with the outer circle of the piston rod (22).

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