Two-stage screw adjusting mechanism in hydraulic cylinder

Abstract

The utility model discloses a two-stage screw adjusting mechanism in a hydraulic cylinder, which comprises a hydraulic cylinder body, a hydraulic cavity arranged in the hydraulic cylinder body, a hydraulic oil injection port communicated with the hydraulic cavity, and a piston rod arranged in the hydraulic cavity, the hydraulic cylinder can move along the hydraulic cavity under the action of hydraulic oil and the reset spring; the other end of the piston rod is connected with the two-stage screw adjusting assembly. The other end of the piston rod is provided with an opening cavity, a threaded sleeve is fixedly arranged in the opening cavity, the threaded rod is arranged in the threaded sleeve, the position of one end of the threaded rod in the opening cavity can be adjusted through a threaded structure, and the other end of the threaded rod is provided with an opening groove used for being connected with an ejector rod. The threaded rod capable of adjusting the connecting position is arranged at the end part of the other end of the piston rod, so that different ejector rod strokes can be adjusted on the basis of the stroke of the piston rod according to the requirements of application scenes.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a double-stage screw adjustment mechanism in a hydraulic cylinder. Background Art

[0002] A hydraulic cylinder, which usually consists of a cylinder body, a piston rod and a sealing device, is a hydraulic actuator that converts hydraulic energy into mechanical energy by inputting hydraulic oil into a sealed cylinder body to push the piston rod and perform linear reciprocating motion (or swinging motion).

[0003] For example, patent application document No. 201920475485.8 discloses a hydraulic cylinder piston rod comprising a piston rod, liquid, and a plug. The piston rod has a cavity in the middle, which is filled with liquid. The plug is threaded and sealed to the liquid inlet of the piston rod, causing the injected liquid to generate a set pressure. This force is in the opposite direction of the critical pressure required for the piston rod's stability. Only after this expansion force is offset does the piston rod begin to withstand the pressure required for stability.

[0004] The above technical solution, by designing the interior of the piston rod to be hollow and filling the hollow portion with high-pressure liquid, provides a supporting force, extending the allowable length of the piston rod, or raising the critical pressure at which the hydraulic cylinder piston rod buckles, provided the internal stress of the piston rod wall allows.

[0005] However, the stroke of existing hydraulic cylinders is mostly determined by the hydraulic chamber and the piston rod, and the two cannot be adjusted after the model is selected and assembled. This results in the hydraulic cylinder being insufficiently versatile in actual applications and unable to fully match the actual needs of the application scenario.

[0006] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0007] The purpose of the utility model is to provide a two-stage screw adjustment mechanism in a hydraulic cylinder to solve the problems in the prior art.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] A two-stage screw adjustment mechanism in a hydraulic cylinder comprises a hydraulic cylinder body, a hydraulic chamber disposed within the hydraulic cylinder body, a hydraulic oil inlet communicating with the hydraulic chamber, and a piston rod disposed within the hydraulic chamber. One end of the piston rod is connected to a return spring and can move along the hydraulic chamber under the action of the hydraulic oil and the return spring.

[0010] The other end of the piston rod is connected to the double-stage screw adjustment assembly;

[0011] The other end of the piston rod is provided with an open cavity, in which a threaded sleeve is fixedly arranged. The threaded rod is arranged in the threaded sleeve, and one end of the threaded rod can be adjusted to a position in the open cavity through a threaded structure. The other end of the threaded rod is provided with an open groove for connecting a push rod.

[0012] Furthermore, the hydraulic cylinder body includes an open main structure, an oil cylinder cap is provided at the open end of the main structure, and the piston rod, threaded sleeve and threaded rod are arranged in the oil cylinder cap.

[0013] Furthermore, an open cavity is respectively provided at both ends of the piston rod, a return spring is arranged in the open cavity at one end thereof, and a threaded rod is arranged in the open cavity at the other end thereof.

[0014] Furthermore, a limiting hole is provided on the inner side wall of the open slot, and a glass ball screw is installed in the limiting hole. After the end of the push rod is inserted into the open slot, it is locked by the glass ball screw.

[0015] In summary, the present invention has the following beneficial effects:

[0016] By arranging a threaded rod with an adjustable connection position at the other end of the piston rod, different ejector rod strokes can be adjusted based on the stroke of the piston rod according to the requirements of the application scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the two-stage screw adjustment mechanism in the hydraulic cylinder of the utility model.

[0018] Figure 2 It is a schematic diagram of the double-stage screw adjustment mechanism of the present invention in the adjusted state.

[0019] Figure 3 It is a schematic diagram of the maximum stroke after adjustment of the two-stage screw adjustment mechanism of the utility model. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to illustrations and specific embodiments.

[0021] like Figures 1 to 3 As shown, the present invention proposes a two-stage screw adjustment mechanism in a hydraulic cylinder, comprising a hydraulic cylinder body 1, a hydraulic chamber 2 disposed inside the hydraulic cylinder body 1, a hydraulic oil inlet 3 connected to the hydraulic chamber 2, and a piston rod 4 disposed inside the hydraulic chamber 2. One end of the piston rod 4 is connected to a return spring 5 and can move along the hydraulic chamber 2 under the action of the hydraulic oil and the return spring 5.

[0022] The other end of the piston rod 4 is connected to the two-stage screw adjustment assembly;

[0023] The other end of the piston rod 4 is provided with an open cavity 41, in which a threaded sleeve 61 is fixedly provided. A threaded rod 62 is provided in the threaded sleeve 61, and one end of the threaded rod 62 can be adjusted to a position in the open cavity 41 through a threaded structure, and the other end of the threaded rod 62 is provided with an open groove 63 for connecting a push rod.

[0024] The hydraulic cylinder body 1 includes an open main structure, and a cylinder cap 11 is provided at the open end of the main structure. The piston rod 4, the threaded sleeve 61 and the threaded rod 62 are arranged in the cylinder cap 11.

[0025] An open cavity 41 is respectively provided at both ends of the piston rod 4 , the return spring 5 is arranged in the open cavity 41 at one end thereof, and the threaded rod 62 is arranged in the open cavity 41 at the other end thereof.

[0026] A limiting hole is provided on the inner side wall of the opening slot 63 , and a glass ball screw 7 is installed in the limiting hole. After the end of the push rod is inserted into the opening slot 63 , it is locked by the glass ball screw 7 .

[0027] The working principle of this utility model is as follows:

[0028] First, assemble the components according to the above structure and connection method. If the stroke of the piston rod 4 meets the requirements of the current application scenario, the threaded rod 62 does not need to be adjusted. If the stroke of the piston rod 4 does not meet the requirements of the current application scenario, rotate the threaded rod 62 through the threaded structure to move the threaded rod 62 along the threaded sleeve 61, so that the stroke of the push rod can be further adjusted based on the stroke of the piston rod to meet the requirements of different application scenarios.

[0029] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description. Therefore, they should not be understood as limitations on the present invention.

[0030] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0031] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A two-stage screw adjustment mechanism in a hydraulic cylinder, comprising a hydraulic cylinder body (1), a hydraulic chamber (2) arranged inside the hydraulic cylinder body (1), a hydraulic oil injection port (3) communicating with the hydraulic chamber (2), and a piston rod (4) arranged inside the hydraulic chamber (2), one end of the piston rod (4) being connected to a return spring (5) and being movable along the hydraulic chamber (2) under the action of the hydraulic oil and the return spring (5); It is characterized by: The other end of the piston rod (4) is connected to the double-stage screw adjustment assembly; The other end of the piston rod (4) is provided with an open cavity (41), a threaded sleeve (61) is fixedly provided in the open cavity (41), a threaded rod (62) is provided in the threaded sleeve (61), and one end of the threaded rod (62) can be adjusted in position in the open cavity (41) through a threaded structure, and the other end of the threaded rod (62) is provided with an open groove (63) for connecting a push rod.

2. The two-stage screw adjustment mechanism in the hydraulic cylinder according to claim 1, characterized in that: The hydraulic cylinder body (1) comprises an open main structure, an oil cylinder cap (11) is provided at the open end of the main structure, and a piston rod (4), a threaded sleeve (61) and a threaded rod (62) are arranged in the oil cylinder cap (11).

3. The two-stage screw adjustment mechanism in the hydraulic cylinder according to claim 1, characterized in that: An open cavity (41) is respectively provided at both ends of the piston rod (4), a return spring (5) is arranged in the open cavity (41) at one end thereof, and a threaded rod (62) is arranged in the open cavity (41) at the other end thereof.

4. The two-stage screw adjustment mechanism in the hydraulic cylinder according to claim 1, characterized in that: A limiting hole is provided on the inner side wall of the opening slot (63), and a glass ball screw (7) is installed in the limiting hole. After the end of the top rod is inserted into the opening slot (63), it is locked by the glass ball screw (7).

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