Multi-smooth buffering hydraulic cylinder

Abstract

The utility model discloses a multiple smooth buffering hydraulic cylinder which comprises a cylinder body and a piston rod arranged in the cylinder body, a guide sleeve is arranged on the left side of the cylinder body, and an end cover is arranged on the right side of the cylinder body. The piston rod is arranged in the guide sleeve and is in sliding fit connection with the guide sleeve; the guide sleeve is provided with a first oil port communicated with the rod cavity; the end cover is provided with a second oil port which is communicated with the rodless cavity; a sliding channel is formed in the center of the end cover; an end cover limiting step is turned on the inner diameter surface of the sliding channel to form a first end cover inner cavity and a second end cover inner cavity; the end cover limiting step and the inner side face of the end cover are each provided with a transverse oil way communicated with the second oil port. A first piston, a second piston and a third piston are sequentially arranged at the end of the piston rod from right to left, the first piston abuts against the first inner cavity of the end cover, the second piston abuts against the second inner cavity of the end cover, and the third piston abuts against the inner diameter face of the cylinder body. According to the utility model, the three groups of pistons are matched by the oil paths, so that the gradual change of the output oil path is realized, buffering is provided for the retraction of the piston rod, and the piston rod main body is effectively protected.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinder manufacturing, in particular to a multi-smoothing buffer hydraulic cylinder. Background Art

[0002] The main function of the cylinder is to convert hydraulic energy into linear reciprocating mechanical motion. It is an indispensable actuator in the hydraulic system.

[0003] Traditional oil cylinders lack a buffer structure and cannot effectively control the movement speed of the piston when it approaches the terminal, causing the piston to stop quickly in a short period of time. This unstable movement state will affect the working efficiency and stability of the equipment. Utility Model Content

[0004] The utility model aims to provide a multi-smooth buffer hydraulic cylinder with buffering function.

[0005] The purpose of the utility model is achieved as follows: a multi-smooth buffer hydraulic cylinder, comprising a cylinder body, and a piston rod disposed inside the cylinder body,

[0006] The cylinder body is provided with a guide sleeve on the left side and an end cover on the right side; the piston rod is placed in the guide sleeve for sliding fit connection, the guide sleeve is provided with a first oil port connected to the rod cavity; the end cover is provided with a second oil port connected to the rodless cavity; a sliding channel is provided at the center of the end cover, and the inner diameter surface of the sliding channel is machined with an end cover limiting step to form the first inner cavity of the end cover and the second inner cavity of the end cover; the end cover limiting step and the inner side surface of the end cover are both provided with a transverse oil path connected to the second oil port;

[0007] The end of the piston rod is provided with a first piston, a second piston and a third piston in sequence from right to left. The first piston abuts against the first inner cavity of the end cover, the second piston abuts against the second inner cavity of the end cover, and the third piston abuts against the inner diameter surface of the cylinder body.

[0008] Preferably, when the third piston slides to come into conflict with the inner side surface of the end cover, the first piston does not separate from the first inner cavity of the end cover, and the second piston does not come into conflict with the limiting step of the end cover and a gap is left.

[0009] Preferably, when the first piston enters and collides with the first inner cavity of the end cover, the second piston does not enter the second inner cavity of the end cover.

[0010] Preferably, the first inner cavity of the end cover and the left opening of the second inner cavity of the end cover are provided with an introduction chamfer.

[0011] Preferably, a plurality of sealing components are provided between the guide sleeve and the piston rod.

[0012] Compared with the prior art, the utility model is beneficial in that:

[0013] A total of three groups of oil circuits are arranged in the end cover to be connected with the oil port pipeline, and multiple groups of pistons are used to slide with them, so that the piston can realize word-sequential coordination with the three groups of oil circuits during movement, and further realize the change of output oil circuits from three to two and then to one, and finally realize the reduction of hydraulic oil output efficiency; that is, when the thrust of the piston rod remains unchanged, the output flow rate is reduced, which slows down the retraction speed of the piston rod and realizes the buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is an enlarged schematic diagram of the structure of the end cover of the utility model.

[0016] Figure 3 It is a structural schematic diagram of the utility model after the first piston just enters the first inner cavity of the end cover.

[0017] Figure 4 This is a schematic structural diagram of the utility model in which the first piston does not enter the first inner cavity of the end cover.

[0018] Among them, 1 is a cylinder body, 2 is a piston rod, 3 is a guide sleeve, 301 is a first oil port, 4 is an end cover, 401 is a second oil port, 402 is an end cover limiting step, 403 is an end cover first inner cavity, 404 is an end cover second inner cavity, 5 is a first piston, 6 is a second piston, 7 is a third piston, and 8 is an introduction chamfer. DETAILED DESCRIPTION

[0019] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and 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.

[0022] like Figure 1-4 As shown, a multi-smoothing buffer hydraulic cylinder includes a cylinder body 1 and a piston rod 2 disposed inside the cylinder body 1.

[0023] A guide sleeve 3 is provided on the left side of the cylinder body 1, and an end cover 4 is provided on the right side; the piston rod 2 is placed in the guide sleeve 3 for sliding fit connection, and a first oil port 301 is provided on the guide sleeve 3 to communicate with the rod cavity; a second oil port 401 is provided on the end cover 4 to communicate with the rodless cavity; a sliding channel is provided at the center of the end cover 4, and an end cover limiting step 402 is machined on the inner diameter surface of the sliding channel to form a first inner cavity 403 of the end cover and a second inner cavity 404 of the end cover; a transverse oil passage 405 is provided on the end cover limiting step 402 and the inner side surface of the end cover 4 to communicate with the second oil port 401;

[0024] like Figure 1-4 As shown, the end of the piston rod 2 is provided with a first piston 5, a second piston 6, and a third piston 7 from right to left. The first piston 5 is in contact with the first inner cavity 403 of the end cover, the second piston 6 is in contact with the second inner cavity 404 of the end cover, and the third piston 7 is in contact with the inner diameter surface of the cylinder body 1. The three groups of pistons realize the closure of each inner cavity in turn during movement, thereby changing the output flow of the hydraulic oil to achieve buffering.

[0025] like Figure 1 As shown, when the third piston 7 slides to collide with the inner side of the end cover 4, the first piston 5 has not separated from the first inner cavity 403 of the end cover. At this time, the first piston is in a state of conflict with the first inner cavity. When oil enters the second oil port 401, the first piston can be subjected to the pressure of the hydraulic oil together with the second piston and the third piston, thereby accelerating the pushing out of the piston rod; the second piston does not collide with the limit step of the end cover and leaves a gap, thereby ensuring that the main rodless cavity (the enclosed area of ​​the third piston and the cylinder body, the piston rod, and the guide sleeve) is in an oil-free state.

[0026] like Figure 1 , 3As shown, when the first piston 5 just enters and collides with the first inner cavity 403 of the end cover, the second piston 6 has not entered the second inner cavity 404 of the end cover, ensuring that the hydraulic oil in the rodless cavity can be discharged from the second oil port through two groups of oil circuits. At the same time, after the second piston enters the first inner cavity of the end cover, the hydraulic oil in the rodless cavity is discharged from the second oil port through a group of oil circuits, that is, the conversion of the hydraulic oil in the rodless cavity from three-way outlets to two-way outlets and one-way outlet is realized, which slows down the discharge rate of the hydraulic oil in the rodless cavity, thereby realizing the buffering effect.

[0027] like Figure 2 As shown, an introduction chamfer 8 is provided at the left opening of the first inner cavity 403 of the end cover and the second inner cavity 404 of the end cover. The entrance of the inner cavity will not form a right-angle entrance. The introduction chamfer can form extrusion with the piston, making it convenient for the piston to directly enter the inner cavity, further reducing the interference deformation between the piston and the inner cavity entrance, and improving the service life of the piston.

[0028] like Figure 1 As shown, multiple sets of sealing components are arranged between the guide sleeve and the piston rod to ensure the sealing between the piston rod and the guide sleeve.

[0029] The working principle of the utility model is explained as follows: when oil is introduced into the first oil port during use, the three groups of pistons move toward the second oil port at the same time, when the first piston enters the first inner cavity of the end cover, the hydraulic circuit is realized by two groups of transverse oil circuits, and when the second piston enters the second inner cavity of the end cover, the hydraulic circuit is realized by one group of transverse oil circuits, and the output is gradually changed from three groups of oil circuits to one group of oil circuits, which is more stable during engineering use; when oil is introduced into the second oil port, the three groups of pistons are subjected to force at the same time, which greatly increases the force-bearing area and is convenient for quick extension.

[0030] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A multi-smoothing buffer hydraulic cylinder, characterized in that: It includes a cylinder body and a piston rod placed inside the cylinder body. The cylinder body is provided with a guide sleeve on the left side and an end cover on the right side; the piston rod is placed in the guide sleeve for sliding fit connection, the guide sleeve is provided with a first oil port connected to the rod cavity; the end cover is provided with a second oil port connected to the rodless cavity; a sliding channel is provided at the center of the end cover, and the inner diameter surface of the sliding channel is machined with an end cover limiting step to form the first inner cavity of the end cover and the second inner cavity of the end cover; the end cover limiting step and the inner side surface of the end cover are both provided with a transverse oil path connected to the second oil port; The end of the piston rod is provided with a first piston, a second piston and a third piston in sequence from right to left. The first piston abuts against the first inner cavity of the end cover, the second piston abuts against the second inner cavity of the end cover, and the third piston abuts against the inner diameter surface of the cylinder body.

2. A multi-smoothing buffer hydraulic cylinder according to claim 1, characterized in that: When the third piston slides to contact the inner side surface of the end cover, the first piston does not leave the first inner cavity of the end cover, and the second piston does not contact the limiting step of the end cover and a gap is left.

3. The multi-smoothing buffer hydraulic cylinder according to claim 1, characterized in that: When the first piston enters and collides with the first inner cavity of the end cover, the second piston does not enter the second inner cavity of the end cover.

4. The multi-smoothing buffer hydraulic cylinder according to claim 1, characterized in that: The first inner cavity of the end cover and the left opening of the second inner cavity of the end cover are provided with introduction chamfers.

5. The multi-smoothing buffer hydraulic cylinder according to claim 1, characterized in that: A plurality of sealing components are arranged between the guide sleeve and the piston rod.

Images