Hydraulic actuator integrated with protective element

Abstract

The utility model discloses a hydraulic actuator integrated with a protective element, which comprises a cylinder barrel, a piston rod is arranged in the cylinder barrel, and a first cylinder cover and a second cylinder cover are respectively arranged at two ends of the cylinder barrel; the extending end of the piston rod extends out of the first cylinder cover, the other end of the piston rod extends out of the second cylinder cover, a shell is arranged on the outer side of the second cylinder cover, the other end of the piston rod is located in the shell, a position sensor is arranged in the shell, and the end, located in the shell, of the piston rod is of a hollow cylindrical structure. The position sensor comprises a magnetic ring and a sensor body, the magnetic ring is arranged in the hollow cylindrical structure of the piston rod, the sensor body is fixedly connected with the shell, and one end of the sensor body extends into the hollow cylindrical structure of the piston rod. According to the utility model, the position information of the piston rod can be conveniently detected; and the pressure sensor is arranged, so that high-precision output of pressure in the cylinder barrel can be realized, and stable operation of the system is also ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic actuators, and in particular relates to a hydraulic actuator integrated with a protective element. Background Art

[0002] Hydraulic actuators are widely used in various tests and measurements in the industrial field. They have the advantages of flexible control and accurate positioning. The existing hydraulic actuator operation status monitoring is imperfect, and it is impossible to collect operation information in time and make adjustments, which affects the smooth operation and is prone to safety accidents. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a hydraulic actuator with integrated protective elements, including a cylinder, a piston rod is provided inside the cylinder, and a first cylinder head and a second cylinder head are provided at both ends of the cylinder respectively; the protruding end of the piston rod extends out of the first cylinder head, and the other end of the piston rod extends out of the second cylinder head, a shell is provided on the outside of the second cylinder head, the other end of the piston rod is located in the shell, a position sensor is provided in the shell, and one end of the piston rod located in the shell is a hollow cylindrical structure; the position sensor includes a magnetic ring and a sensor body, the magnetic ring is arranged in the hollow cylindrical structure of the piston rod, the sensor body is fixedly connected to the shell, and one end of the sensor body extends into the hollow cylindrical structure of the piston rod.

[0004] Preferably, the device further comprises a controller, wherein the controller is electrically connected to the position sensor.

[0005] Preferably, the first cylinder cover is provided with a through hole for the piston rod to slide, and the piston rod is clearance-matched with the first cylinder cover; a plurality of first oil grooves are evenly distributed on the inner wall of the through hole, and the first oil grooves are connected with the oil drain port.

[0006] Preferably, the diameter matching clearance between the piston rod and the through hole is 0.02-0.03 mm.

[0007] Preferably, the through hole is also provided with an annular groove for installing a sealing ring.

[0008] Preferably, the portion where the piston rod contacts the inner wall of the cylinder is in clearance fit with the inner surface of the cylinder, and a plurality of second oil grooves are evenly distributed along the axial direction at the portion where the piston rod contacts the inner wall of the cylinder.

[0009] Preferably, the outer surface of the piston rod is provided with a ceramic coating.

[0010] Preferably, a force sensor is installed at the extended end of the piston rod, and the force sensor is fixedly connected to the piston rod via a transfer adapter; the force sensor is electrically connected to the controller.

[0011] Preferably, a pressure sensor is provided on the cylinder, the inner side of the pressure sensor extends into the cylinder, and the pressure sensor is electrically connected to the controller.

[0012] Preferably, the support table top is fixedly connected to the support plate.

[0013] Preferably, the positioning column is provided with through holes arranged vertically, and positioning pins are matched with the through holes.

[0014] Beneficial effects:

[0015] The utility model integrates the protection element of the hydraulic actuator, the other end of the piston rod extends out from the second cylinder head, the second cylinder head is provided with a shell, the other end of the piston rod is located in the shell, a position sensor is provided in the shell, and one end of the piston rod located in the shell is a hollow cylindrical structure; the position sensor includes a magnetic ring and a sensor body, the magnetic ring is provided in the hollow cylindrical structure of the piston rod, the sensor body is fixedly connected to the shell, and one end of the sensor body extends into the hollow cylindrical structure of the piston rod, so as to facilitate the detection of the position information of the piston rod. A pressure sensor is provided to achieve high-precision output of the pressure in the cylinder and ensure the smooth operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a structural schematic diagram of a hydraulic actuator with integrated protection element according to the utility model.

[0018] Figure 2 It is a cross-sectional view of the first cylinder head.

[0019] Figure 3 This is an enlarged view of the piston part. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] like Figure 1-3As shown, the utility model discloses a hydraulic actuator with integrated protective elements, including a cylinder 2, a piston rod 6 is provided inside the cylinder 2, and a first cylinder head 1 and a second cylinder head 3 are provided at both ends of the cylinder 2 respectively; the extended end of the piston rod 6 extends out of the first cylinder head 1, and the other end of the piston rod 6 extends out of the second cylinder head 3, a shell 14 is provided on the outside of the second cylinder head 3, the other end of the piston rod 6 is located in the shell 14, a position sensor is provided in the shell 14, and one end of the piston rod 6 located in the shell 14 is a hollow cylindrical structure; the position sensor includes a magnetic ring 8 and a sensor body 9, the magnetic ring 8 is arranged in the hollow cylindrical structure of the piston rod 6, the sensor body 9 is fixedly connected to the shell 14, and one end of the sensor body 9 extends into the hollow cylindrical structure of the piston rod 6.

[0022] The first cylinder head 1 is provided with a through hole 10 for the piston rod 6 to slide, and the diameter matching clearance between the piston rod 6 and the through hole 10 is 0.02-0.03 mm; within this range, the first cylinder head 1 and the piston rod 6 can be matched with high precision, so that the equipment can effectively play the role of oil cylinder decompression without using the main seal ring, and does not affect the load test of the actuator. When the piston rod 6 is working, there is no main oil seal to press it, which reduces the resistance of the piston rod 6 and thus improves the response speed of the actuator.

[0023] A plurality of first oil grooves 11 are provided on the inner wall of the through hole 10, and the first oil grooves 11 are connected to the oil drain port 12, so that a small amount of leaked oil passes through the first oil grooves 11 and finally returns to the oil tank through the oil drain port 12, thereby avoiding oil leakage.

[0024] The through hole 10 is also provided with an annular groove 13 for installing a sealing ring, so that the sealing ring can scrape off the oil on the piston rod 6 to ensure the clean operation of the piston rod 6.

[0025] The rear end of the piston rod 6 extends out of the second cylinder head 3, and a shell 14 is provided on the outer side of the second cylinder head 3. The rear end of the piston rod 6 is located in the shell 14, and a position sensor is provided in the shell 14. The rear end of the piston rod 6 is a hollow structure; the position sensor includes a magnetic ring 8 and a sensor body 9, the magnetic ring 8 is arranged in the hollow cavity of the piston rod 6, the sensor body 9 is fixedly connected to the shell 14, and the sensor body 9 extends into the hollow cavity of the piston rod 6; the magnetic ring 8 moves with the piston rod 6, and the sensor body 9 can sense the position of the magnetic ring 8 and then detect the moving distance of the piston rod 6; the magnetic ring 8 can be a magnet, fixed to the inner wall of the hollow cavity of the piston rod 6, and when the piston rod 6 is displaced, it drives the magnetic ring 8 to move, and the sensor body 9 senses the position of the magnetic ring 8 and then can detect the moving distance of the piston rod 6; the position sensor is electrically connected to the controller.

[0026] The part where the piston rod 6 in the cylinder 2 is in sliding contact with the cylinder 2 is the piston part 60. The circumferential surface of the piston part 60 is evenly provided with a plurality of second oil grooves 61 along the axial direction. The piston part 60 and the inner surface of the cylinder 2 are clearance-matched; a ceramic coating is provided on the outer surface of the piston rod 6. The ceramic coating on the outer surface of the piston rod 6 can further reduce friction and improve the corrosion resistance of the piston rod 6. The gap between the piston rod 6 and the inner surface of the cylinder 2 is used to form a lubricating oil film and a gap seal, and the piston part 60 is separated from the inner surface of the cylinder 2 by the lubricating oil film; the second oil groove 61 is used to dynamically store the hydraulic oil required for the formation of the lubricating oil film. Since the piston part 60 and the inner surface of the cylinder 2 are clearance-fitted, a hydraulic oil leakage gap is formed between the oil chambers of the cylinder 2 on both sides of the piston part 60. The effect of the gap leakage of the hydraulic oil on the pressure change in the oil chamber can be ignored, and the hydraulic oil leaked in the gap can be compensated by a special hydraulic oil source through a servo valve. Therefore, the gap between the piston part 60 and the inner surface of the cylinder 2 can make full use of the formed lubricating oil film to reduce the friction between the two.

[0027] A force sensor 4 is installed at the top of the piston rod 6 , and the force sensor 4 is fixedly connected to the piston rod 6 via a transfer adapter 5 ; the force sensor 4 is electrically connected to the controller.

[0028] A pressure sensor 7 is provided on the cylinder 2, and the inner side of the pressure sensor 7 is connected to the inside of the cylinder 2. The pressure sensor 7 is used to measure the pressure in the cylinder 2. The pressure sensor 7 compares the pressure signal in the cylinder 2 with the input signal through the amplifier of the pressure servo valve to obtain a deviation signal to control and adjust the valve core opening of the pressure servo valve until the pressure signal in the cylinder 2 is equal to the input signal, thereby realizing high-precision output of the pressure in the cylinder 2.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "side", "end", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hydraulic actuator with integrated protection element, characterized in that: The invention comprises a cylinder barrel (2), wherein a piston rod (6) is arranged inside the cylinder barrel (2), and a first cylinder head (1) and a second cylinder head (3) are arranged at two ends of the cylinder barrel (2); the protruding end of the piston rod (6) protrudes out of the first cylinder head (1), and the other end of the piston rod (6) protrudes from the second cylinder head (3); a shell (14) is arranged outside the second cylinder head (3), and the other end of the piston rod (6) is located inside the shell (14); a position sensor is arranged inside the shell (14), and one end of the piston rod (6) located inside the shell (14) is a hollow cylindrical structure; the position sensor comprises a magnetic ring (8) and a sensor body (9), the magnetic ring (8) is arranged in the hollow cylindrical structure of the piston rod (6), the sensor body (9) is fixedly connected to the shell (14), and one end of the sensor body (9) protrudes into the hollow cylindrical structure of the piston rod (6); a pressure sensor (7) is arranged on the cylinder barrel (2), and the inner side of the pressure sensor (7) protrudes into the cylinder barrel (2).

2. The hydraulic actuator with integrated protection element according to claim 1, characterized in that: It also comprises a controller which is electrically connected to the position sensor and the pressure sensor (7).

3. The hydraulic actuator with integrated protection element according to claim 1, characterized in that: The first cylinder cover (1) is provided with a through hole (10) for the piston rod (6) to slide, and the piston rod (6) and the first cylinder cover (1) are loosely matched; a plurality of first oil grooves (11) are evenly distributed on the inner wall of the through hole (10), and the first oil grooves (11) are connected to the oil discharge port (12).

4. The hydraulic actuator with integrated protection element according to claim 3, characterized in that: The diameter matching clearance between the piston rod (6) and the through hole (10) is 0.02-0.03 mm.

5. The hydraulic actuator with integrated protection element according to claim 3 or 4, characterized in that: The through hole (10) is also provided with an annular groove (13) for installing a sealing ring.

6. The hydraulic actuator with integrated protection element according to claim 1, characterized in that: The portion where the piston rod (6) contacts the inner wall of the cylinder barrel (2) is clearance-matched with the inner surface of the cylinder barrel (2), and the portion where the piston rod (6) contacts the inner wall of the cylinder barrel (2) is evenly distributed along the axial direction with a plurality of second oil grooves (61).

7. The hydraulic actuator with integrated protection element according to claim 6, characterized in that: The outer surface of the piston rod (6) is provided with a ceramic coating.

8. The hydraulic actuator with integrated protection element according to claim 2, characterized in that: A force sensor (4) is installed at the extended end of the piston rod (6), and the force sensor (4) and the piston rod (6) are fixedly connected via a transfer adapter (5); the force sensor (4) is electrically connected to a controller.

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