Single-action thin oil cylinder

Abstract

The utility model relates to an oil cylinder, in particular to a single-action thin oil cylinder, which comprises a cylinder body, an oil cylinder cover and an oil cylinder cover, the cylinder body is provided with a cavity, an output end and an input end, and the output end of the cylinder body is fixedly provided with an end cover; the output end of the piston rod penetrates through the end cover, the input end of the piston rod is connected with a piston, and the size of the piston is matched with that of the cavity, so that the cavity is divided into two parts by the piston; the elastic assembly is arranged between the end cover and the piston; a first sealing groove is formed in the position, where the piston rod penetrates through, of the end cover, and a first sealing ring is arranged in the first sealing groove. According to the structure, the first sealing groove is formed in the position, where the piston rod penetrates through the end cover, of the piston rod, so that the thickness of the cylinder body is reduced, and good sealing performance is still achieved.

Description

Technical Field

[0001] The utility model relates to an oil cylinder, in particular to a single-acting thin oil cylinder. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] The hydraulic cylinder is one of the actuators in the hydraulic system and is used to perform linear reciprocating motion. It is characterized by light weight, high power, simple structure, easy maintenance, frequent reversing, and easy remote control. It can be divided into single-acting hydraulic cylinders and double-acting hydraulic cylinders according to the action mode of its hydraulic pressure. A single-acting cylinder refers to a cylinder in which hydraulic oil is only supplied to the rodless chamber or the rod chamber of the cylinder, and the hydraulic pressure is used to realize the movement of the piston in one direction, while the other direction needs to rely on its own weight or external force to achieve. A double-acting cylinder realizes the movement of the piston rod in two directions by alternating oil supply to the two chambers.

[0004] Generally speaking, single-acting cylinders only need one chamber to supply oil, so only one hydraulic pipeline is needed to provide pressure. Therefore, they can be lighter and thinner than double-acting cylinders. However, in some industrial usage scenarios, the thickness of existing single-acting cylinders is still too thick, which makes the use of space cramped. Some existing technologies reduce the thickness of single-acting cylinders by reducing components, but their sealing performance is also affected, which is not conducive to later maintenance.

[0005] There is no single-acting thin oil cylinder that can solve the above problems at present. Utility Model Content

[0006] The utility model aims to provide a single-acting thin oil cylinder, which can reduce the thickness of the cylinder body itself and still have better sealing performance by arranging a first sealing groove at the place where the piston rod passes through the end cover.

[0007] In order to achieve the above-mentioned purpose, the utility model discloses the following single-acting thin oil cylinder; the single-acting thin oil cylinder comprises:

[0008] A cylinder body, wherein the cylinder body has a cavity, and the cylinder body has an output end and an input end, and an end cover is fixed to the output end of the cylinder body;

[0009] A piston rod, the output end of the piston rod is penetrated by the end cover, the input end of the piston rod is connected to a piston, the size of the piston matches the cavity, so that the cavity is separated into two parts by the piston;

[0010] An elastic component, wherein the elastic component is arranged between the end cover and the piston;

[0011] Wherein, the end cover has a first sealing groove at the position where the piston rod passes through, and a first sealing ring is arranged in the first sealing groove.

[0012] Furthermore, the end cover includes a raised annular wall along the direction of the input end, and the piston rod has a rod-out state and a rod-returning state, wherein in the rod-out state, the elastic component is compressed, and the piston moves at most to contact the annular wall, and in the rod-returning state, the elastic component is relaxed, and the piston is separated from the annular wall.

[0013] Furthermore, the piston rod passes through the piston, and the piston has a second sealing groove at the position where the piston rod passes through, and a second sealing ring is provided in the second sealing groove.

[0014] Furthermore, the cylinder body is provided with oil inlet and outlet holes at an edge of one side of the input end.

[0015] Furthermore, the cylinder body is provided with an exhaust hole at an edge of one side of the output end.

[0016] Furthermore, the piston rod is threadedly connected to the piston.

[0017] Furthermore, the input end of the end cover and the output end of the piston respectively have a slot matching the elastic mechanism, so that the two ends of the elastic mechanism are respectively clamped in the slots at corresponding positions.

[0018] Furthermore, the elastic mechanism is configured as a metal coil spring.

[0019] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0020] The single-acting thin oil cylinder of the utility model can provide a first sealing groove at the place where the piston rod passes through the end cover, and embed the sealing structure of the output end between the piston rod and the end cover in a hidden manner, and achieve good sealing through the first sealing ring therebetween, and no other additional mechanism for achieving sealing is provided, thereby making full use of the condition that the single-acting oil cylinder does not have high requirements on the sealing performance of the output end, so that the thickness of the cylinder body itself is reduced, and still has good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1It is a cross-sectional schematic diagram of a single-acting thin oil cylinder provided in an embodiment of this specification;

[0023] Figure 2 It is a schematic diagram of an end cover of a single-acting thin oil cylinder provided in an embodiment of this specification;

[0024] In the figure: 1, cylinder body; 11, cavity; 12, oil inlet and outlet holes; 13, exhaust hole; 2, end cover; 21, first sealing groove; 22, annular wall; 3, piston rod; 4, piston; 41, second sealing groove; 5, elastic component. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0026] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0027] See also Figure 1-2 , is a single-acting thin oil cylinder of this embodiment; wherein the single-acting thin oil cylinder comprises:

[0028] A cylinder body 1, wherein the cylinder body 1 has a cavity 11, and the cylinder body 1 has an output end and an input end, and an end cover 2 is fixed to the output end of the cylinder body 1;

[0029] A piston rod 3, the output end of the piston rod 3 is provided with an end cover 2, the input end of the piston rod 3 is connected with a piston 4, the size of the piston 4 matches the cavity 11, so that the cavity 11 is separated into two parts by the piston 4;

[0030] An elastic component 5, which is arranged between the end cover 2 and the piston 4;

[0031] The end cover 4 has a first sealing groove 21 at the position where the piston rod 3 passes through, and a first sealing ring is arranged in the first sealing groove 21 .

[0032] Through the above structure, when in use, the operator only needs to install the end of the piston rod 3 connected to the piston 4 to the closed input end of the cylinder body 1, and then put the elastic component 5 on the piston rod 3, and then put the end cover 2 on the piston rod 3 and install it on the open output end of the cylinder body 1. Before putting the end cover 2 on the piston rod 3, it is also necessary to install a matching first sealing ring in the first sealing groove 21 of the end cover 2.

[0033] When the single-acting thin oil cylinder of this embodiment is started, the input end of the cylinder body 1 is continuously filled with hydraulic oil from the outside. As the volume of the hydraulic oil increases, the input end of the piston 4 is subjected to the pressure of the hydraulic oil, so that the piston 4 drives the piston rod 3 connected to the piston 4 to move toward the output end of the cylinder body 1, until the preset part of the piston rod 3 is completely extended out of the output end of the cylinder body 1, and the rod of this embodiment is completed, and the elastic component 5 is in a compressed tense state. After the rod is completed, when the rod needs to be returned, the external stop of the hydraulic oil to the input end of the cylinder body 1, the elastic component 5 changes from the compressed tense state to the relaxed state, so that the piston 4 at the input end of the elastic component 5 is subjected to the pressure from the elastic component 5, and the piston 4 moves toward the input end of the cylinder body 1 under the push of the elastic component 5, and the hydraulic oil at the input end of the cylinder body 1 is gradually discharged to the outside of the input end of the cylinder body 1 during the process, until the preset amount of hydraulic oil is completely emptied, and the piston rod 3 is retracted into the cylinder body 1, completing this return of the rod.

[0034] In the above process, since the return of the piston rod 3 can be achieved by the extension and retraction of the elastic component 5, and the cavity 11 at the elastic component 5 does not have hydraulic oil, the internal sealing requirement is not high. Therefore, the sealing requirement on the output end side of the cylinder body 1 can be met by installing a matching first sealing ring in the first sealing groove 21 of the end cover 2. Compared with the existing method that requires an additional sealing device to be installed on the output end side of the cylinder body 1 or no sealing device is installed, the first sealing groove 21 and the first sealing ring therein in this embodiment isolate the outer side of the output end of the cylinder body 1 from the inside of the cylinder body 1, and the inside of the cylinder body 1 is protected from the influence of external dust, so that the single-acting thin oil cylinder has the effect of being light and thin and still meeting the preset sealing requirements.

[0035] Furthermore, if Figure 1As shown, the end cover 2 includes a raised annular wall 22 along the input end direction, and the piston rod 3 has a rod-out state and a rod-returning state, wherein in the rod-out state, the elastic component 5 is compressed, and the piston 4 moves at most to abut against the annular wall 22, and in the rod-returning state, the elastic component 5 is relaxed, and the piston 4 is separated from the annular wall 22. By setting the annular wall 22 in the above structure, the situation that the elastic component 5 may be damaged by excessive squeezing of the piston 4 on the elastic component 5 when the piston rod 3 is out of the rod is limited, that is, the existing elastic component 5 is relatively less compressed when the piston rod 3 is fully out of the rod. At the same time, by setting the customized extension length of the annular wall 22 along the input end, the process distance of the piston rod 3 and the piston 4 can be changed on the basis of the same piston rod 3 length, or the inflow and outflow of hydraulic oil can be controlled, which has a wide range of applications.

[0036] Furthermore, the piston rod 3 passes through the piston 4, and the piston 4 has a second sealing groove 41 at the position where the piston rod 3 passes through, and a second sealing ring is provided in the second sealing groove 41. Through the provision of the second sealing groove 41, the cylinder body 1 is completely isolated by the piston 4 on the side of the input end for filling the hydraulic oil and the side of the output end for placing the elastic component 5, thereby preventing the hydraulic oil from penetrating into the side of the output end for placing the elastic component 5 from the gap between the piston rod 3 and the piston 4 in the mechanical connection, and further extending the service life of the single-acting thin oil cylinder of the utility model.

[0037] It is worth noting that in this embodiment, the periphery of the piston 4 also has a sealing ring in contact with the inner wall of the cylinder body 1, so that the cylinder body 1 is more tightly isolated by the piston 4 on the side of the input end for filling the hydraulic oil and the side of the output end for placing the elastic component 5, thereby avoiding leakage of the hydraulic oil.

[0038] Furthermore, the cylinder body 1 is provided with an oil inlet and outlet hole 12 at the edge of one side of the input end, and at the same time, the cylinder body 1 is provided with an exhaust hole 13 at the edge of one side of the output end. By arranging the oil inlet and outlet hole 12 at the edge of one side of the input end, the layout of the cylinder body 1 can be more conducive to thinning along the movement direction of the piston rod 3, so that the piston 4 is completely in contact with the inner wall of the input end of the cylinder body 1 without affecting the oil inlet and outlet function of the oil inlet and outlet hole 12. At the same time, the exhaust hole 13 on the output end side of the cylinder body 1 is also arranged close to the output end, so that the piston 4 can be as close to the output end side of the cylinder body 1 as possible, and the use of the exhaust hole 13 is not affected. It is worth noting that in this embodiment, the oil inlet and outlet hole 12 and the exhaust hole 13 can never be in the same connected cavity 11, that is, the oil inlet and outlet hole 12 and the exhaust hole 13 are always isolated by the piston 4 to avoid leakage of hydraulic oil.

[0039] Furthermore, in the present embodiment, the piston rod 3 and the piston 4 are threadedly connected, which can provide a reliable mechanical connection through the close fit between the threads, thereby ensuring a firm connection between the piston rod 3 and the piston 4 and withstanding high pressure and mechanical stress. At the same time, it also has good disassembly performance, which is convenient for maintenance and replacement of parts. The thread technology is also relatively mature, which helps to reduce deviation and wear of the piston rod 3 and the piston 4 during operation.

[0040] Furthermore, the input end of the end cover 2 and the output end of the piston 4 respectively have slots matching the elastic mechanism 5, so that the two ends of the elastic mechanism 5 are respectively clamped in the slots at corresponding positions. Specifically, the elastic mechanism 5 is configured as a metal coil spring, and the slot sizes at the input end and the output end of the elastic mechanism 5 are annular groove structures matching the diameter of the metal coil spring, and the depth of the groove body can at least cover half of the local cross-section of the metal body of the metal coil spring, so that the elastic component 5 can be stably clamped between the input end of the end cover 2 and the output end of the piston 4 in the cylinder body 1, avoiding the deviation of the elastic component 5 caused by the vibration generated during the workmanship of the single-acting thin cylinder of this embodiment, so that when the piston rod 3 returns, the elastic component 5 does not exert sufficient pressure on the output end of the piston 4, resulting in the piston rod 3 not returning smoothly or even failing to return, and the single-acting thin cylinder fails and cannot continue to be used.

[0041] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0042] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A single-acting thin cylinder; characterized in that, The single-acting thin cylinder comprises: A cylinder body, wherein the cylinder body has a cavity, and the cylinder body has an output end and an input end, and an end cover is fixed to the output end of the cylinder body; A piston rod, the output end of the piston rod is penetrated by the end cover, the input end of the piston rod is connected to a piston, the size of the piston matches the cavity, so that the cavity is separated into two parts by the piston; An elastic component, wherein the elastic component is arranged between the end cover and the piston; Wherein, the end cover has a first sealing groove at the position where the piston rod passes through, and a first sealing ring is arranged in the first sealing groove.

2. The single-acting thin cylinder according to claim 1 is characterized in that: The end cover includes a raised annular wall along the direction of the input end, and the piston rod has a rod-out state and a rod-returning state. In the rod-out state, the elastic component is compressed, and the piston moves at most to contact the annular wall. In the rod-returning state, the elastic component is relaxed, and the piston is separated from the annular wall.

3. The single-acting thin cylinder according to claim 1 is characterized in that: The piston rod passes through the piston, and the piston has a second sealing groove at the position where the piston rod passes through, and a second sealing ring is arranged in the second sealing groove.

4. The single-acting thin cylinder according to claim 1 is characterized in that: The cylinder body is provided with oil inlet and outlet holes at an edge of one side of the input end.

5. The single-acting thin cylinder according to claim 1 is characterized in that: The cylinder body is provided with an exhaust hole at an edge of one side of the output end.

6. The single-acting thin cylinder according to claim 1 is characterized in that: The piston rod is threadedly connected to the piston.

7. The single-acting thin cylinder according to claim 1 is characterized in that: The input end of the end cover and the output end of the piston respectively have a clamping groove matching the elastic component, so that the two ends of the elastic component are respectively clamped in the clamping grooves at corresponding positions.

8. The single-acting thin cylinder according to claim 1 is characterized in that: The elastic component is configured as a metal coil spring.

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