Oil cylinder with built-in guide rod

Abstract

The utility model discloses an oil cylinder with a built-in guide rod in the field of oil cylinders. The oil cylinder comprises a cylinder body, a front end cover, a rear end cover, a piston rod and the guide rod. The cylinder body is a barrel with two open ends; the front end cover and the rear end cover are fixed to openings in the two ends of the cylinder body through bolts. A channel is formed in the center of the front end cover, a piston rod is arranged in the channel, a piston is arranged at the tail end of the piston rod and symmetrically provided with a set of piston through holes, one end of a guide rod is inserted into the piston through holes of the rear end cover, and the other end of the guide rod is fixed in the front end cover. The other end is fixed in the front end cover; piston guide sleeves are arranged at openings in the two ends of the piston through hole and matched with the guide rods. A clamping portion and a protruding portion are arranged at the tail end of the piston rod, the piston is arranged in the clamping portion, the diameter of the protruding portion is larger than that of the clamping portion, and the piston is pressed and fixed through a pressing ring. In the operation process, the piston body and the piston rod body are small in deviation and can better adapt to complex working conditions; meanwhile, the guide rod is internally arranged, no external guide structure exists, and the overall size is smaller.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to an oil cylinder with a built-in guide rod. Background Art

[0002] With the in-depth development of industrial automation, the requirements for mechanical equipment are getting higher and higher. As an important component for realizing mechanical motion control, the demand for guide rod cylinders is increasing. Especially in some high-precision, high-speed, and high-load occasions, the role of guide rod cylinders is more prominent.

[0003] Traditional oil cylinders have no guide rods, and their accuracy is not high during operation, which is prone to cheapness; some oil cylinders with external guide rods are usually heavy and large in size, which is inconvenient to use in situations where compact design or lightweight is required; at the same time, some oil cylinders with built-in guide rods have fixed ends of the guide rods, which is inconvenient to disassemble and has low efficiency. Utility Model Content

[0004] The utility model aims to provide an oil cylinder with a built-in guide rod which has stable operation.

[0005] The purpose of the utility model is achieved as follows: an oil cylinder with a built-in guide rod comprises a cylinder body, a front end cover, a rear end cover, a piston rod and a guide rod; the cylinder body is a cylindrical body with openings at both ends; the front end cover and the rear end cover are fixed to the openings at both ends of the cylinder body by bolts; a channel is provided in the center of the front end cover, a piston rod is provided in the channel, a piston is provided at the end of the piston rod, a group of piston through holes are symmetrically provided on the piston along the diameter direction, one end of the guide rod is inserted into the piston through hole of the rear end cover, and the other end is fixed in the front end cover; piston guide sleeves are provided at the openings at both ends of the piston through hole, and the piston guide sleeves cooperate with the guide rod;

[0006] A clamping portion and a convex portion are provided at the end of the piston rod, the piston is placed in the clamping portion, the diameter of the convex portion is larger than the diameter of the clamping portion, and the piston is clamped and fixed by a pressure ring.

[0007] Preferably, an insertion hole is provided on the inner side surface of the rear end cover, and an enlarged groove is provided at the bottom of the insertion hole.

[0008] Preferably, the end of the guide rod is connected to a rubber sleeve via a bolt, the diameter of the rubber sleeve is larger than the diameter of the insertion hole, and a raised ring is provided at the bottom of the rubber sleeve.

[0009] Preferably, a retaining ring is provided at one end of the pressure ring extending inwardly, the retaining ring abuts against the side surface of the protruding portion, and the other end of the pressure ring abuts against the piston and is fixed by bolts.

[0010] Preferably, the piston guide sleeve is connected to the piston via bolts, and a plurality of sealing rings are provided on the contact surface between the piston guide sleeve and the guide rod.

[0011] Compared with the prior art, the utility model is beneficial in that:

[0012] 1. A rubber ring is set at the end of the guide rod so that one end of the guide rod can better match the groove of the insertion hole after insertion, which can further ensure that the guide rod will not shake and improve the stability of the guide rod after installation; at the same time, the guide rod is easy to disassemble and assemble, easy to replace and repair, and improve efficiency;

[0013] 2. The built-in guide rod cooperates with the piston to ensure that the piston rod will not be displaced when extending or retracting, so that it can be used better in harsh working conditions;

[0014] 3. The other end of the piston is compressed twice by a pressure ring to avoid piston loosening and reduce maintenance frequency;

[0015] 4. Install a piston guide sleeve on the piston, and install multiple sets of sealing rings on the inner diameter surface of the piston guide sleeve, so that the piston and the piston rod can fit more closely, have higher sealing performance, and are less likely to leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A magnified view of the structure in the middle.

[0018] Among them, 1 cylinder body, 2 front end cover, 201 channel, 3 rear end cover, 301 insertion hole, 301 enlarged groove, 4 piston rod, 401 clamping part, 402 raised part, 5 guide rod, 6 piston, 601 piston through hole, 7 piston guide sleeve, 8 pressure ring, 801 retaining ring, 9 rubber sleeve, 901 raised ring. 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 1-2 As shown, a cylinder with a built-in guide rod comprises a cylinder body 1, a front cover 2, a rear cover 3, a piston rod 4, and a guide rod 5; the cylinder body 1 is a cylindrical body with openings at both ends; the front cover 2 and the rear cover 3 are fixed to the openings at both ends of the cylinder body 1 by bolts; a channel 201 is provided at the center of the front cover 2, a piston rod 4 is provided in the channel 201, and a plurality of sealing rings are also provided on the inner wall of the channel to ensure the sealing performance; a piston 6 is provided at the end of the piston rod 4, and a group of piston through holes 601 are symmetrically provided on the piston 6 along the diameter direction, one end of the guide rod 5 is inserted into the piston through hole 601 of the rear cover, and the other end is fixed in the front cover 2; piston guide sleeves 7 are provided at the openings at both ends of the piston through hole 601, and the piston guide sleeves 7 cooperate with the guide rod 5, so that the piston runs more smoothly under the guidance of the guide rod and is not easy to deviate;

[0023] A clamping portion 401 and a raised portion 402 are provided at the end of the piston rod 4, and the piston 6 is placed in the clamping portion 401. The diameter of the raised portion 402 is larger than the diameter of the clamping portion 401. The piston 6 is clamped and fixed by a pressure ring 8. After the piston is placed in the clamping portion, it is clamped by the pressure ring again, and the stability of the piston after installation is greatly improved.

[0024] like Figure 1-2As shown, an insertion hole 301 is provided on the inner side of the rear end cover 3, and an enlarged groove 3011 is provided at the bottom of the insertion hole 301. The enlarged groove and the raised ring are limitedly matched to ensure that the end of the guide rod can be limitedly matched with the insertion hole, thereby further preventing the guide rod from shaking.

[0025] like Figure 2 As shown, the end of the guide rod 5 is connected to a rubber sleeve 9 by bolts. The diameter of the rubber sleeve 9 is larger than the diameter of the insertion hole 301. A raised ring 901 is provided at the bottom of the rubber sleeve 9, that is, the end of the piston rod can smoothly enter the insertion hole and form extrusion with the insertion hole through the deformation of the rubber sleeve and the raised ring, thereby ensuring the stability of the end of the guide rod after insertion and avoiding shaking of the guide rod.

[0026] like Figure 2 As shown, one end of the pressure ring 8 extends inward and is provided with a retaining ring 801, which abuts against the side of the raised portion 402, and the other end of the pressure ring 8 abuts against the piston 6 and is fixed by bolts; after one end of the pressure ring is fixed to the piston, the other end is connected to the raised portion through the retaining ring, so that both sides of the piston as a whole can be clamped, thereby improving the stability of the piston during operation and preventing it from falling off due to excessive shaking.

[0027] like Figure 1-2 As shown, the piston guide sleeve 7 is connected to the piston 6 by bolts, and a plurality of sealing rings are arranged on the contact surface between the piston guide sleeve and the guide rod, and the sealing rings are used to strengthen the sealing between the guide rod and the piston to avoid leakage of hydraulic oil.

[0028] The working principle of the utility model is explained as follows: during assembly, the guide rod is inserted and matched with the insertion hole of the rear end cover, and then the rear end cover is connected and matched with the cylinder body, and finally the piston rod and the piston are inserted into the cylinder body, and the piston is matched with the guide rod; when in use, the piston rod drives the piston to move back and forth, and the piston body and the guide rod form a guiding match to avoid large deviation of the piston and improve stability during operation.

[0029] 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 cylinder with a built-in guide rod, comprising a cylinder body, a front cover, a rear cover, a piston rod, and a guide rod; characterized in that: The cylinder body is a cylindrical body with openings at both ends; the front cover and the rear cover are fixed to the openings at both ends of the cylinder body by bolts; a channel is provided in the center of the front cover, a piston rod is provided in the channel, a piston is provided at the end of the piston rod, a group of piston through holes are symmetrically provided on the piston along the diameter direction, one end of the guide rod is inserted into the piston through hole of the rear cover, and the other end is fixed in the front cover; the other end is fixed in the front cover; piston guide sleeves are provided at the openings at both ends of the piston through hole, and the piston guide sleeves cooperate with the guide rod; A clamping portion and a convex portion are provided at the end of the piston rod, the piston is placed in the clamping portion, the diameter of the convex portion is larger than the diameter of the clamping portion, and the piston is clamped and fixed by a pressure ring.

2. The oil cylinder with built-in guide rod according to claim 1, characterized in that: An insertion hole is arranged on the inner side surface of the rear end cover, and an enlarged groove is arranged at the bottom of the insertion hole.

3. The oil cylinder with built-in guide rod according to claim 1, characterized in that: The end of the guide rod is connected with a rubber sleeve through a bolt, the diameter of the rubber sleeve is larger than the diameter of the insertion hole, and a raised ring is arranged at the bottom of the rubber sleeve.

4. The oil cylinder with built-in guide rod according to claim 1, characterized in that: One end of the pressure ring extends inwardly to be provided with a retaining ring, the retaining ring abuts against the side surface of the protruding portion, and the other end of the pressure ring abuts against the piston and is fixed by bolts.

5. The oil cylinder with built-in guide rod according to claim 1, characterized in that: The piston guide sleeve is connected to the piston through bolts, and a plurality of sealing rings are arranged on the contact surface between the piston guide sleeve and the guide rod.

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