Structure and method for preventing hydraulic piston from rotating

Abstract

The invention discloses a structure and method for preventing a hydraulic piston from rotating in the technical field of hydraulic power element structures. The structure comprises a cylinder body, a first piston and a second piston. The cylinder body is provided with a first hydraulic cavity and a second hydraulic cavity which communicate with each other. The first hydraulic cavity is in a cylinder shape. A plurality of guide columns extending in the axial direction are arranged in the first hydraulic cavity. The first piston is arranged in the first hydraulic cavity. The first piston is sleeved on the guide column in a dynamic sealing mode and is connected with the inner wall of the first hydraulic cavity in a dynamic sealing mode. The second piston is arranged in the second hydraulic cavity in a dynamic sealing mode. According to the structure for preventing the hydraulic piston from rotating, the first piston and the second piston achieve power transmission through hydraulic transmission, and the guide column can guide the first piston, so that the first piston translates in the axial direction of the first hydraulic cavity and does not rotate relative to the cylinder body.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic power element structures, and in particular to a structure and method for preventing a hydraulic piston from rotating. Background Art

[0002] Traditional hydraulic cylinders are generally circular in cross-section, and the matching piston cross-section is also circular. The push rod connected to the piston generally does not rotate or has no tendency to rotate. However, in the hydraulic transmission structure formed by using a hole-type servo motor to push the hydraulic piston, the output screw of the hole-type servo motor is connected to the hydraulic piston. When using a hole-type servo motor to drive the hydraulic piston of a hydraulic structure such as a booster cylinder, it is necessary to limit the rotation of the hydraulic piston so that the screw can be extended and retracted when the nut of the hole-type servo motor rotates forward and reversely, thereby realizing a compact, high-precision direct-drive direct-connection structure. In existing hydraulic systems, the rotation of the hydraulic piston is generally prevented by matching a non-circular cross-section special-shaped piston with a special-shaped cylinder body, which has high requirements for processing accuracy and leads to high production costs. Moreover, when a hole-type servo motor is used to drive a special-shaped piston, the special-shaped piston is subjected to torque, which often leads to a significant reduction in the sealing performance between the special-shaped piston and the special-shaped cylinder body. Summary of the invention

[0003] The object of the present invention is to provide a structure for preventing a hydraulic piston from rotating, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are: A structure for preventing a hydraulic piston from rotating comprises: a cylinder body, a first piston and a second piston; The cylinder body has a first hydraulic chamber and a second hydraulic chamber that are interconnected; The first hydraulic chamber is cylindrical in shape, and a plurality of guide pillars are provided in the first hydraulic chamber, and the guide pillars extend along the axial direction of the first hydraulic chamber. The first piston is provided in the first hydraulic chamber, and the first piston dynamic seal sleeve is provided on the guide pillars and is dynamically sealed with the inner wall of the first hydraulic chamber. The second piston dynamic seal is arranged in the second hydraulic chamber.

[0005] The structure for preventing the hydraulic piston from rotating provided by the present invention has at least the following beneficial effects: the first piston and the second piston realize power transmission through hydraulic transmission. When the hydraulic power source drives the first piston to move along the first hydraulic chamber, the guide column can guide the first piston so that the first piston translates along the axial direction of the first hydraulic chamber without rotating relative to the cylinder body.

[0006] As a further improvement of the above technical solution, a first fixing plate and a second fixing plate are respectively provided at two axial ends of the first hydraulic chamber, and two ends of the guide column are respectively connected to the first fixing plate and the second fixing plate.

[0007] As a further improvement of the above technical solution, it also includes a screw-type push rod, the first fixed plate is arranged at one end of the first hydraulic chamber away from the second hydraulic chamber, and the screw-type push rod is coaxially penetrated by the first fixed plate and connected to the first piston.

[0008] As a further improvement of the above technical solution, the first hydraulic chamber and the second hydraulic chamber are both cylindrical in shape and are coaxially arranged with each other.

[0009] As a further improvement of the above technical solution, the diameter of the second hydraulic chamber is larger than the diameter of the first hydraulic chamber.

[0010] As a further improvement of the above technical solution, it also includes a fixed seat plate, which is fixedly connected to the cylinder body and is provided with a avoidance hole, and the first hydraulic chamber is penetrated in the avoidance hole.

[0011] As a further improvement of the above technical solution, an output end is provided at one end of the second piston away from the first hydraulic chamber, and a cover plate is provided at one end of the second hydraulic chamber away from the first hydraulic chamber, and the cover plate is provided with an output hole for the output end to move axially.

[0012] As a further improvement of the above technical solution, a return spring is provided between the second piston and the cover plate.

[0013] As a further improvement of the above technical solution, the guide column is cylindrical in shape, the first piston is provided with a guide hole extending axially therethrough, the guide columns are respectively arranged in the guide holes, and sealing rings are provided on the outer peripheries of the guide holes and the first piston.

[0014] The present invention also provides a method for preventing a hydraulic piston from rotating, which is applicable to the above-mentioned structure for preventing a hydraulic piston from rotating: a guide column is arranged in the first hydraulic chamber to guide the first piston, thereby preventing the first piston from rotating when moving in the first hydraulic chamber. When a hole-type servo motor is used as a power source, the output rod or output shaft of the hole-type servo motor can limit the rotation pair through the first piston, thereby realizing a direct drive and direct connection between the hole-type servo motor and the hydraulic booster structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 This is a three-dimensional schematic diagram of an embodiment of the structure for preventing the hydraulic piston from rotating provided by the present invention; Figure 2This is a three-dimensional exploded schematic diagram of an embodiment of the structure for preventing the hydraulic piston from rotating provided by the present invention; Figure 3 The structure for preventing the hydraulic piston from rotating provided by the present invention is a top cross-sectional view of one embodiment thereof; Figure 4 The structure for preventing the hydraulic piston from rotating provided by the present invention is a side cross-sectional view of one embodiment thereof; Figure 5 yes Figure 3 A partial enlarged view of area A.

[0016] In the figure: 100-cylinder body, 110-first hydraulic chamber, 111-guide column, 112-first fixed plate, 113-second fixed plate, 120-second hydraulic chamber, 121-cover plate, 122-reset spring, 130-fixed seat plate, 200-first piston, 210-guide hole, 220-sealing ring, 230-connecting groove, 240-connecting screw, 250-leakage-proof sealing member, 300-second piston, 310-output end, 400-screw-type push rod. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0021] Reference Figures 1 to 5 The structure for preventing the hydraulic piston from rotating of the present invention is implemented as follows: A structure for preventing a hydraulic piston from rotating includes a cylinder body 100, a first piston 200 and a second piston 300.

[0022] The cylinder 100 has a first hydraulic chamber 110 and a second hydraulic chamber 120 that are communicated with each other.

[0023] The first hydraulic chamber 110 is cylindrical in shape. A plurality of guide pillars 111 are provided in the first hydraulic chamber 110, and the guide pillars 111 extend along the axial direction of the first hydraulic chamber 110. The first piston 200 is disposed in the first hydraulic chamber 110, and the first piston 200 is dynamically sealed by the guide pillars 111 and dynamically sealed with the inner wall of the first hydraulic chamber 110.

[0024] The second piston 300 is dynamically sealed and disposed in the second hydraulic chamber 120 .

[0025] In actual use, the first piston 200 transmits power to the second piston 300 through hydraulic transmission. When the hydraulic power drives the first piston 200 to move along the first hydraulic chamber 110, the guide column 111 can guide the first piston 200 so that the first piston 200 translates along the axial direction of the first hydraulic chamber 110 without relative rotation with the cylinder body 100.

[0026] In this embodiment, the cylinder body 100 is in the shape of a variable diameter cylinder. The first hydraulic chamber 110 and the second hydraulic chamber 120 are both in the shape of a cylinder. The first hydraulic chamber 110 and the second hydraulic chamber 120 are coaxially arranged with each other. Referring to the accompanying drawings, the cylinder body 100 has a central axis extending left and right. The axial directions of the first hydraulic chamber 110 and the second hydraulic chamber 120 both extend along the central axis. The first hydraulic chamber 110 is arranged on the right side of the second hydraulic chamber 120.

[0027] The first hydraulic chamber 110 is provided with a first fixing plate 112 and a second fixing plate 113 at two circumferential ends. The first fixing plate 112 and the second fixing plate 113 are both fixedly connected to the cylinder body 100. The guide column 111 is connected to the first fixing plate 112 and the second fixing plate 113 at two axial ends.

[0028] In this embodiment, the first fixing plate 112 is arranged at the right end of the first hydraulic chamber 110, and the second fixing plate 113 is arranged at the left end of the first hydraulic chamber 110. The second fixing plate 113 is in the shape of an annular plate. An annular groove is arranged at the left end of the first hydraulic chamber 110, and the second fixing plate 113 is embedded in the annular groove and is locked and connected with the cylinder body 100 by screws. The first fixing plate 112 is covered at the right end of the first hydraulic chamber 110, and is locked and connected with the cylinder wall of the cylinder body 100 surrounding the first hydraulic chamber 110 by screws. The second fixing plate 113 is in the shape of an annular plate, so that the first hydraulic chamber 110 can be connected with the second hydraulic chamber 120.

[0029] In this embodiment, the guide pillar 111 is in the shape of a cylinder. There are two guide pillars 111. The two guide pillars 111 are respectively arranged at the front and rear sides of the first hydraulic chamber 110. The first piston 200 is in the shape of a disc, and the first piston 200 is provided with guide holes 210 that pass through the left and right sides. The number of the guide holes 210 is the same as that of the guide pillars 111. The two guide holes 210 are respectively coaxially aligned with the two guide pillars 111 along the axial direction, and the guide pillars 111 are dynamically sealed and penetrated in the guide holes 210 in a one-to-one correspondence.

[0030] In order to achieve dynamic sealing between the first piston 200, the guide column 111 and the first hydraulic chamber 110, corresponding sealing rings 220 are provided on the outer periphery of the first piston 200 and in the guide hole 210. The guide column 111 and the first hydraulic chamber 110 are both cylindrical, and the sealing ring 220 can be a standard part of corresponding specifications, with low procurement cost.

[0031] In this embodiment, the diameter of the second hydraulic chamber 120 is larger than the diameter of the first hydraulic chamber 110. When the thrust drives the first piston 200 to move to the left, the hydraulic transmission can transmit the thrust to the second piston 300. According to Pascal's principle, the larger diameter of the second piston 300 can make the output force greater than the input thrust, thereby achieving a boosting effect.

[0032] In a further embodiment, to facilitate thrust output, an output end 310 is provided at one end of the second piston 300 away from the first hydraulic chamber 110. The output end 310 is cylindrical and extends axially toward a side away from the first hydraulic chamber 110. When the second piston 300 is at the right limit position, the output end 310 can be exposed at the left end of the cylinder body 100, so as to facilitate connection with a load and output thrust.

[0033] A cover plate 121 is provided at one end of the second hydraulic chamber 120 away from the first hydraulic chamber 110. The cover plate 121 is provided with an output hole for the output end 310 to move axially. In the present embodiment, the cover plate 121 is in the shape of an annular plate. The cover plate 121 is fixedly connected to the left end of the cylinder body 100 by screws. The output hole is circular and passes through the cover plate 121 from left to right. The output hole is coaxially arranged with the output end 310. The diameter of the output hole is larger than the outer diameter of the output end 310, so that the second piston 300 will not interfere with or collide with the cover plate 121 when moving axially from left to right. The cover plate 121 can provide a limit for the left end of the second hydraulic chamber 120, so that the second piston 300 is confined in the second hydraulic chamber 120.

[0034] Furthermore, a return spring 122 is provided between the second piston 300 and the cover plate 121. The return spring 122 is coaxially sleeved on the outer periphery of the output end 310. The axial ends of the return spring 122 are elastically pressed against the second piston 300 and the cover plate 121, respectively, so that the second piston 300 is subjected to an elastic force to the right. When the first piston 200 no longer inputs thrust, the second piston 300 can be reset to the right under the action of the elastic force.

[0035] In a further embodiment, the structure for preventing the hydraulic piston from rotating of the present invention further comprises a screw-type push rod 400. The screw-type push rod 400 is arranged on the right side of the cylinder body 100, and the screw-type push rod 400 is coaxially movably penetrated through the first fixing plate 112. The left end of the screw-type push rod 400 is coaxially fixedly connected to the first piston 200.

[0036] Specifically, the first fixing plate 112 is provided with a through hole through which the screw-type push rod 400 can move. The screw-type push rod 400 is inserted into the through hole and fixedly connected to the first piston 200, so that the thrust can be transmitted to the first piston 200. In actual use, the rotor of the hole-type servo motor is sleeved on the screw-type push rod 400 and is threadedly connected to the screw-type push rod 400. When the hole-type servo motor drives the rotor to rotate, since the two guide columns 111 prevent the first piston 200 from rotating, the screw-type push rod 400 and the first piston 200 will not rotate around the axial direction. Therefore, the relative rotation between the rotor and the screw-type push rod 400 can make the screw-type push rod 400 move forward and backward along the axial direction, thereby realizing a high-precision direct-drive direct-connection structure.

[0037] The first piston 200 is fixedly connected to the screw-type push rod 400 by a connecting screw 240. The connecting screw 240 passes through the first piston 200 and is threadedly locked with the end of the screw-type push rod 400. In a further embodiment, in order to prevent leakage, a connecting groove 230 is provided on the right side of the first piston 200, and the left end of the screw-type push rod 400 is embedded in the connecting groove 230. A circular ring-shaped leakproof seal 250 is provided in the connecting groove 230. The leakproof seal 250 is in sealing contact with the outer wall of the end of the screw-type push rod 400 and the inner wall of the connecting groove 230.

[0038] Furthermore, the cylinder body 100 is provided with a fixed seat plate 130. The fixed seat plate 130 is fixedly connected to the cylinder body 100 and is provided with a position avoidance hole, and the first hydraulic chamber 110 is penetrated in the position avoidance hole. Referring to the drawings, the fixed seat plate 130 of this embodiment is arranged at the left end of the outer side of the first hydraulic chamber 110, the position avoidance hole is coaxially sleeved on the outer side of the first hydraulic chamber 110, and the fixed seat plate 130 is arranged on the step surface formed between the second hydraulic chamber 120 and the first hydraulic chamber 110, and is locked and fixed with the cylinder body 100 by screws.

[0039] The present invention also provides a method for preventing a hydraulic piston from rotating, which is applicable to the above-mentioned structure for preventing a hydraulic piston from rotating, comprising: providing a guide column 111 in the first hydraulic chamber 110 to guide the first piston 200, thereby preventing the first piston 200 from rotating when moving in the first hydraulic chamber 110. When a hole-type servo motor is used as a power source, the output rod or output shaft of the hole-type servo motor can limit the rotation pair through the first piston 200, thereby realizing a direct drive and direct connection between the hole-type servo motor and the hydraulic booster structure.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] Although the embodiments of the present invention have been shown and described, a person skilled in the art may make various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention. These changes, modifications, equivalent variations or substitutions are all included in the scope defined by the claims of this application. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A structure for preventing a hydraulic piston from rotating, characterized in that: include: A cylinder body, a first piston and a second piston; The cylinder body has a first hydraulic chamber and a second hydraulic chamber that are interconnected; The first hydraulic chamber is cylindrical in shape, and a plurality of guide pillars are provided in the first hydraulic chamber, and the guide pillars extend along the axial direction of the first hydraulic chamber. The first piston is provided in the first hydraulic chamber, and the first piston dynamic seal sleeve is provided on the guide pillars and is dynamically sealed with the inner wall of the first hydraulic chamber. The second piston dynamic seal is arranged in the second hydraulic chamber.

2. The structure for preventing the hydraulic piston from rotating according to claim 1, characterized in that: A first fixing plate and a second fixing plate are respectively disposed at two axial ends of the first hydraulic chamber, and two ends of the guide column are respectively connected to the first fixing plate and the second fixing plate.

3. The structure for preventing the hydraulic piston from rotating according to claim 2, characterized in that: It also includes a screw-type push rod. The first fixed plate is arranged at one end of the first hydraulic chamber away from the second hydraulic chamber. The screw-type push rod is coaxially penetrated through the first fixed plate and connected to the first piston.

4. The structure for preventing the hydraulic piston from rotating according to claim 1, characterized in that: The first hydraulic chamber and the second hydraulic chamber are both cylindrical in shape and are coaxially arranged with each other.

5. The structure for preventing the hydraulic piston from rotating according to claim 4, characterized in that: The diameter of the second hydraulic chamber is greater than the diameter of the first hydraulic chamber.

6. The structure for preventing the hydraulic piston from rotating according to claim 5, characterized in that: It also includes a fixed seat plate, which is fixedly connected to the cylinder body and is provided with a position avoidance hole, and the first hydraulic chamber is penetrated in the position avoidance hole.

7. The structure for preventing the hydraulic piston from rotating according to claim 1, characterized in that: An output end is provided at one end of the second piston away from the first hydraulic chamber, and a cover plate is provided at one end of the second hydraulic chamber away from the first hydraulic chamber. The cover plate is provided with an output hole for the output end to move axially.

8. The structure for preventing the hydraulic piston from rotating according to claim 7, characterized in that: A return spring is arranged between the second piston and the cover plate.

9. The structure for preventing the hydraulic piston from rotating according to claim 1, characterized in that: The guide post is in a cylindrical shape, the first piston is provided with a guide hole which penetrates in the axial direction, the guide posts are arranged in the guide holes in a one-to-one correspondence, and the outer peripheries of the guide holes and the first piston are both provided with sealing rings.

10. A method for preventing a hydraulic piston from rotating, characterized in that: The structure for preventing the hydraulic piston from rotating is applicable to any one of claims 1 to 9, wherein the method for preventing the hydraulic piston from rotating comprises: setting a guide column in the first hydraulic chamber to guide the first piston to prevent the first piston from rotating when moving in the first hydraulic chamber.

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