A micro-force actuator cylinder

Abstract

The present invention discloses a low-force actuator oil cylinder, which relates to the field of actuator equipment and includes a connecting plate, a cylinder seat sleeve, a cylinder body, and a cylinder head connected in sequence. A piston rod is inserted into the cylinder body, and a sealing sleeve is fixedly installed on the inner wall of the cylinder body. The piston rod includes an integrally formed first rod and a second rod. The first rod passes through the cylinder head and is connected to an actuator screw adjustment mechanism. The actuator screw adjustment mechanism is sequentially connected to a load sensor and a pressure head. A balancing spring is sleeved on the second rod. One end of the balancing spring is connected to the end of the second rod, and the other end is fixedly connected to the sealing sleeve on the inner wall of the cylinder body. The diameter of the first rod is larger than that of the second rod. A through hole is formed through the cylinder body at the connection point between the first rod and the second rod, and the through hole is connected to a high-pressure pipeline system. The present invention uses a variable-diameter piston rod instead of a traditional piston rod, thereby improving the overall load-bearing capacity of the piston rod.

Description

Technical Field

[0001] The present invention relates to the technical field of actuator equipment, in particular to a micro-force actuator oil cylinder. Background Art

[0002] Fatigue is the phenomenon of fracture caused by accumulated damage to material components under the long-term effects of fluctuating stress and strain. Fatigue is a type of low-stress cyclic delayed fracture, and fatigue fracture is a very dangerous fracture. Analyzing and studying the initiation and propagation of fatigue cracks in components has very important social and economic significance. Fatigue testing generally requires the use of an actuator to quickly and continuously impact the component, thereby simulating the fatigue strength of the component connected to the test. Different types and categories of components require different load frequencies and magnitudes. For components requiring small loads, micro-force actuators are generally used for testing. Since the load required by micro-force actuators is small, the cylinder piston rods of micro-force actuators are often very thin. When loads are applied at high frequencies, they are prone to fracture, affecting the test process. Summary of the Invention

[0003] The purpose of the present invention is to provide a micro-force actuator cylinder to solve the problems existing in the above-mentioned prior art. A variable diameter piston rod is used to replace the traditional piston rod, thereby improving the overall load bearing capacity of the piston rod.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a micro-force actuator oil cylinder, comprising a connecting plate, to which an internally hollow oil cylinder seat sleeve is fixedly connected, an end of the oil cylinder seat sleeve is fixedly connected to a cylinder body, an end of the cylinder body is fixedly connected to a cylinder cover, a piston rod is passed through the cylinder body, and a sealing sleeve is fixedly provided on the inner wall of the cylinder body; the piston rod comprises an integrally formed first rod and a second rod, the first rod is connected to an actuator screw adjustment mechanism after passing through the cylinder cover, and the actuator screw adjustment mechanism is connected to a load sensor and a pressure head in sequence; a balancing spring is sleeved on the second rod, one end of the balancing spring is connected to the end of the second rod, and the other end is fixedly connected to the sealing sleeve on the inner wall of the cylinder body; the diameter of the first rod is larger than the diameter of the second rod, and a through hole penetrating the cylinder body is opened at the connection position of the first rod and the second rod, and the through hole is connected to a high-pressure pipeline system.

[0006] Optionally, a spring pressure cover is further included, which is a block-shaped structure, a groove is provided at one end of the spring pressure cover, a threaded through hole is provided in the groove, a protrusion is provided at the end of the second rod, the protrusion is nested in the groove, and is fixedly connected to the spring pressure cover by a bolt passing through the threaded through hole; one end of the balance spring is fixedly connected to the outside of the groove of the spring pressure cover.

[0007] Optionally, a connecting hole is provided at one end of the cylinder seat sleeve, and a threaded hole is provided at the other end, the threaded hole is connected to the connecting hole and is concentrically arranged, and the diameter of the connecting hole is larger than the diameter of the threaded hole; a threaded fixing hole is provided at one end of the cylinder body, and the threaded fixing hole and the threaded hole are fixedly connected by a fastening bolt; the end of the fastening bolt is clamped at the connection position between the connecting hole and the threaded hole.

[0008] Compared with the prior art, the present invention has achieved the following technical effects:

[0009] The micro-force actuator cylinder of the present invention adopts a piston rod with a stepped shaft structure, and utilizes the difference in cross-sectional area between the first rod and the second rod to replace the traditional thin piston rod. While ensuring that the actuator load remains unchanged, the cross-sectional area of ​​the piston rod is increased, the strength of the piston rod is improved, and the breakage of the piston rod is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 Schematic diagram of the cross-sectional structure of the oil cylinder of the micro-force actuator of the present invention;

[0012] Figure 2 Schematic diagram of the piston rod structure of the oil cylinder of the micro-force actuator of the present invention;

[0013] Among them, 1 is the connecting plate, 2 is the cylinder seat sleeve, 3 is the cylinder body, 4 is the cylinder head, 5 is the piston rod, 501 is the first rod, 502 is the second rod, 503 is the protrusion, 6 is the sealing sleeve, 7 is the actuator screw adjustment mechanism, 8 is the load sensor, 9 is the pressure head, 10 is the balance spring, 11 is the through hole, 12 is the spring pressure cover, 13 is the bolt, and 14 is the fastening bolt. DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0015] The purpose of the present invention is to provide a micro-force actuator cylinder to solve the problems existing in the above-mentioned prior art. A variable diameter piston rod is used to replace the traditional piston rod, thereby improving the overall load bearing capacity of the piston rod.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention provides a micro-force actuator oil cylinder, such as Figure 1 and Figure 2 As shown, it includes a connecting plate 1, to which a hollow cylinder seat sleeve 2 is fixedly connected, the end of the cylinder seat sleeve 2 is fixedly connected to a cylinder body 3, the end of the cylinder body 3 is fixedly connected to a cylinder head 4, a piston rod 5 is passed through the cylinder body 3, and a sealing sleeve 6 is fixedly provided on the inner wall of the cylinder body 3; the piston rod 5 includes an integrally formed first rod 501 and a second rod 502, the first rod 501 is connected to an actuator screw adjustment mechanism 7 after passing through the cylinder head 4, and the actuator screw adjustment mechanism 7 is connected to a load sensor 8 and a pressure head 9 in sequence; a balancing spring 10 is sleeved on the second rod 502, one end of the balancing spring 10 is connected to the end of the second rod 502, and the other end is fixedly connected to the sealing sleeve 6 on the inner wall of the cylinder body 3; the diameter of the first rod 501 is larger than the diameter of the second rod 502, and a through hole 11 that passes through the cylinder body is opened at the connection position of the first rod 501 and the second rod 502, and the through hole 11 is connected to the high-pressure pipeline system.

[0018] Further preferably, the spring pressure cover 12 is provided. The spring pressure cover 12 is a block-shaped structure. A groove is provided at one end of the spring pressure cover 12. A threaded through hole is provided in the groove. A protrusion 503 is provided at the end of the second rod 502. The protrusion 503 is nested in the groove and fixedly connected to the spring pressure cover 12 by a bolt 13 passing through the threaded through hole. One end of the balance spring 10 is fixedly connected to the outer side of the groove of the spring pressure cover 12. The oil cylinder seat sleeve 2 has a connecting hole at one end and a threaded hole at the other end. The threaded hole and the connecting hole are connected and concentrically arranged. The diameter of the connecting hole is larger than that of the threaded hole. A threaded fixing hole is provided at one end of the cylinder body 3. The threaded fixing hole and the threaded hole are fixedly connected by a fastening bolt 14. The end of the fastening bolt 14 is clamped at the connecting position of the connecting hole and the threaded hole.

[0019] During operation, the high-pressure pipeline system supplies oil, the piston rod 5 moves downward, the balance spring 10 is compressed, the high-pressure pipeline unloads the high-pressure oil, and the balance spring 10 drives the piston rod 5 back under the action of elastic force, so that the piston rod 5 reciprocates in the cylinder body 3.

[0020] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A micro-force actuator oil cylinder, characterized in that: The cam is provided with a plurality of connecting rods, and the connecting rods are connected to the cam, and the connecting rods are connected to the cam. A threaded hole is provided, which is connected to the connecting hole and is concentrically arranged, and the diameter of the connecting hole is larger than the diameter of the threaded hole; a threaded fixing hole is provided at one end of the cylinder body, and the threaded fixing hole and the threaded hole are fixedly connected by a fastening bolt; the end of the fastening bolt is clamped at the connection position of the connecting hole and the threaded hole; the high-pressure pipeline system supplies oil, the piston rod moves downward, the balance spring is pressurized, the high-pressure pipeline unloads the high-pressure oil, and the balance spring drives the piston rod back under the action of elastic force; it also includes a spring pressure cover, which is a block structure, and a groove is provided at one end of the spring pressure cover, and a threaded through hole is provided at the groove. A protrusion is provided at the end of the second rod, and the protrusion is nested in the groove and fixedly connected to the spring pressure cover by a bolt passing through the threaded through hole; one end of the balance spring is fixedly connected to the outside of the groove of the spring pressure cover.

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