Hydraulic cylinder

Abstract

The utility model discloses a hydraulic cylinder, which relates to the technical field of hydraulic cylinders and comprises a cylinder barrel, a piston arranged in the cylinder barrel and a sealing element, at least one mounting groove is arranged on the peripheral wall of the piston, the sealing element is arranged in the mounting groove, notches are arranged on one side or two sides of the piston, and the sealing element is arranged in the mounting groove. A flow guide hole is formed in the piston, one end of the flow guide hole communicates with the notch, and the other end of the flow guide hole communicates with the mounting groove. According to the hydraulic cylinder, the sealing piece comprises the first sealing ring and the second sealing ring, the first sealing ring is limited in the mounting groove through the second sealing ring, hydraulic oil enters the mounting groove through the groove opening and the flow guide hole, outward thrust is applied to the first sealing ring, and therefore the first sealing ring can abut against the inner wall of the cylinder barrel all the time; the sealing performance is improved, and the first sealing ring does not need to be replaced frequently.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a commonly used component of engineering machinery. It consists of a cylinder barrel, a piston rod and a piston located inside the cylinder barrel. The end of the piston rod that extends into the cylinder barrel is equipped with a piston. When the hydraulic oil pushes the piston, the piston can drive the piston rod to reciprocate.

[0003] The hydraulic cylinder in the prior art includes a cylinder barrel and a piston disposed in the cylinder barrel, wherein the piston can reciprocate in the cylinder barrel, and the piston and the cylinder barrel are sealed by a sealing ring. However, during the reciprocating movement of the piston, friction will be generated between the sealing ring and the inner wall of the cylinder barrel, resulting in serious wear of the sealing ring, which requires frequent replacement of the sealing ring and is not convenient for long-term use. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic cylinder for solving the above technical problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A hydraulic cylinder comprises a cylinder barrel and a piston arranged in the cylinder barrel, and also comprises a sealing member, wherein at least one mounting groove is provided on the outer peripheral wall of the piston, the sealing member is provided in the mounting groove, a notch is provided on one side or both sides of the piston, a guide hole is provided inside the piston, one end of the guide hole is connected to the notch, and the other end of the guide hole is connected to the mounting groove.

[0007] Preferably, the sealing member comprises a first sealing ring, which is disposed in the mounting groove, and a gap is provided between an inner peripheral wall of the first sealing ring and a bottom wall of the mounting groove.

[0008] As a further preference, it further comprises a second sealing ring, wherein the two second sealing rings are arranged on both sides of the first sealing ring.

[0009] As a further preference, clamping grooves are opened on both sides of the installation groove, and the two second sealing rings are arranged in the clamping grooves.

[0010] As a further preference, the slot is filled with sealant to fix the second sealing ring.

[0011] As a further preference, it further includes a pressing plate and an adjusting member, wherein the pressing plate is arranged in the slot, and the adjusting member is connected to the pressing plate and is used to drive the pressing plate to press the second sealing ring.

[0012] As a further preference, the adjusting member includes a screw rod and a fixing block arranged at one end of the screw rod, a countersunk hole, a threaded hole and a mounting hole are provided on the outer wall of the piston, the countersunk hole, the threaded hole and the mounting hole are coaxially arranged, and the two ends of the threaded hole are connected to the mounting hole and the countersunk hole, the mounting hole is connected to the slot, the screw rod is arranged in the threaded hole, the fixing block is arranged in the countersunk hole, and a cross slot is provided on the fixing block.

[0013] As a further preference, it further includes a connecting sleeve and a limit block, wherein the limit block is arranged in the mounting hole and connected to the pressure plate, the limit block is arranged in the connecting sleeve, and the other end of the screw rod is connected to the limit block.

[0014] The above technical solution has the following advantages or beneficial effects:

[0015] In the utility model, the sealing member comprises a first sealing ring and a second sealing ring, the first sealing ring is restricted in the mounting groove by the second sealing ring, the hydraulic oil enters the mounting groove through the notch and the guide hole, and applies an outward thrust to the first sealing ring, so that the first sealing ring can always be against the inner wall of the cylinder, thereby improving the sealing performance and eliminating the need for frequent replacement of the first sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the hydraulic cylinder in the utility model;

[0017] Figure 2 yes Figure 1 Sectional view along AA direction;

[0018] Figure 3 It is a front view of the piston in the utility model;

[0019] Figure 4 yes Figure 3 Cross-sectional view along the BB direction;

[0020] Figure 5 It is an exploded schematic diagram of the sealing member, the pressing plate and the adjusting member in the utility model;

[0021] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0022] Figure 7 yes Figure 4 Enlarged view of point D in the middle.

[0023] In the figure: 1. cylinder; 2. piston; 3. sealing member; 301. first sealing ring; 302. second sealing ring; 4. mounting groove; 5. notch; 6. guide hole; 8. pressure plate; 9. adjusting member; 901. screw; 902. fixing block; 903. connecting sleeve; 904. limiting block; 10. countersunk hole; 11. threaded hole; 12. mounting hole. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or 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.

[0027] Figure 1 It is the front view of the hydraulic cylinder in the utility model; Figure 2 yes Figure 1 Sectional view along AA direction; Figure 3 It is a front view of the piston in the utility model; Figure 4 yes Figure 3 Cross-sectional view along the BB direction; Figure 5 It is an exploded schematic diagram of the sealing member, the pressing plate and the adjusting member in the utility model; Figure 6 yes Figure 5 Enlarged view of point C in the middle; Figure 7 yes Figure 4 For the enlarged view of D in the figure, please see Figures 1 to 4 FIG. 1 shows a preferred embodiment, which shows a hydraulic cylinder, including a cylinder barrel 1 and a piston 2 arranged in the cylinder barrel 1, and also includes a seal 3. The outer peripheral wall of the piston 2 is provided with at least one mounting groove 4, and the mounting groove 4 is provided with a seal 3. A notch 5 is provided on one side or both sides of the piston 2, and a guide hole 6 is provided inside the piston 2. One end of the guide hole 6 is connected to the notch 5, and the other end of the guide hole 6 is connected to the mounting groove 4. In this embodiment, see Figure 4 As shown, two mounting grooves 4 are provided on the outer peripheral wall of the piston 2, and two seals 3 are provided and installed in the mounting grooves 4, wherein the slot 5 is connected with the mounting groove 4 through the guide hole 6. When in use, the hydraulic oil can enter the guide hole 6 from the slot 5, and then enter the mounting groove 4, and push the seal 3 to move to the outside of the mounting groove 4, so that the seal 3 can always be in contact with the inner wall of the cylinder 1, thereby improving the sealing effect.

[0028] Further, as a preferred embodiment, the sealing member 3 includes a first sealing ring 301, which is arranged in the installation groove 4, and there is a gap between the inner peripheral wall of the first sealing ring 301 and the bottom wall of the installation groove 4. In this embodiment, a second sealing ring 302 is also included, and the two second sealing rings 302 are arranged on both sides of the first sealing ring 301, wherein the second sealing ring 302 and the first sealing ring 301 are arranged in an integrated manner, see Figure 5 The second sealing ring 302 is used to restrict the first sealing ring 301 in the installation groove 4 to prevent the first sealing ring 301 from being separated from the installation groove 4 .

[0029] Further, as a preferred embodiment, two sides of the installation groove 4 are provided with a card slot, and two second sealing rings 302 are arranged in the card slot. Figure 4 and Figure 5 As shown, the first sealing ring 301 is restricted in the installation groove 4 by fixing the second sealing ring 302 in the clamping groove, wherein the second sealing ring 302 is elastic and can be deformed to facilitate the first sealing ring 301 to move to the outside of the installation groove 4.

[0030] Further, as a preferred implementation, the card slot is filled with sealant to fix the second sealing ring 302. In this embodiment, the card slot can be filled with sealant to facilitate fixing the second sealing ring 302 in the card slot and also achieve a sealing effect.

[0031] Further, as a preferred embodiment, it also includes a pressing plate 8 and an adjusting member 9, a pressing plate 8 is provided in the card slot, and the adjusting member 9 is connected to the pressing plate 8, and is used to drive the pressing plate 8 to press the second sealing ring 302. Among them, the adjusting member 9 includes a screw 901 and a fixing block 902 provided at one end of the screw 901, a countersunk hole 10, a threaded hole 11 and a mounting hole 12 are provided on the outer wall of the piston 2, the countersunk hole 10, the threaded hole 11 and the mounting hole 12 are coaxially arranged, and the two ends of the threaded hole 11 are connected to the mounting hole 12 and the countersunk hole 10, and the mounting hole 12 is connected to the card slot, the screw 901 is provided in the threaded hole 11, the fixing block 902 is provided in the countersunk hole 10, and a cross groove is provided on the fixing block 902, and it also includes a connecting sleeve 903 and a limit block 904, the limit block 904 is provided in the mounting hole 12 and connected to the pressing plate 8, the limit block 904 is provided in the connecting sleeve 903, and the other end of the screw 901 is connected to the limit block 904. In this embodiment, the connecting sleeve 903 can be fixedly connected to the pressure plate 8, and the limit block 904 can rotate in the connecting sleeve 903, but will not be separated from the connecting sleeve 903. A limit ring can be provided at the opening of the connecting sleeve 903, and the screw 901 passes through the limit ring. The limit ring is used to limit the limit block 904 in the connecting sleeve 903. Among them, the screw 901 can push the pressure plate 8 to press the second sealing ring 302. A cross groove is provided on the fixing block 902 at one end of the screw 901, which can cooperate with an external screwdriver to facilitate the rotation of the screw 901. In this embodiment, see Figure 5 As shown, four pressing plates 8 are arranged in each slot, the pressing plates 8 are arranged in an arc shape, and each pressing plate 8 corresponds to an adjusting member 9.

[0032] When in use, the first sealing ring 301 is installed in the installation groove 4, and the second sealing ring 302 is installed in the card groove. Then, the card groove can be filled with sealant, or the screw 901 can be controlled to rotate by a screwdriver so that the screw 901 drives the pressure plate 8 to press the second sealing ring 302, thereby limiting the first sealing ring 301 in the installation groove 4. When the piston 2 is installed in the cylinder 1, when in use, the hydraulic oil can enter the guide hole 6 through the notch 5, and then enter the gap between the first sealing ring 301 and the bottom wall of the installation groove 4. At this time, the hydraulic oil will push the first sealing ring 301 to move to the outside of the installation groove 4. , so that the first sealing ring 301 is against the inner wall of the cylinder 1, and the sealing performance is improved. Since the second sealing ring 302 is elastic, the first sealing ring 301 can move to the outside of the installation groove 4. When the first sealing ring 301 is worn, under the action of the hydraulic oil, the first sealing ring 301 will always move to the outside of the installation groove 4. Since the first sealing ring 301 is elastic, the first sealing ring 301 can fit tightly with the inner wall of the cylinder 1, which can avoid the leakage of hydraulic oil from the first sealing ring 301, thereby reducing the frequency of replacing the first sealing ring 301 and facilitating long-term use.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder, comprising a cylinder barrel and a piston disposed in the cylinder barrel, characterized in that: It also includes a sealing component, wherein at least one mounting groove is provided on the outer peripheral wall of the piston, the sealing component is provided in the mounting groove, a notch is provided on one side or both sides of the piston, a guide hole is provided inside the piston, one end of the guide hole is connected to the notch, and the other end of the guide hole is connected to the mounting groove.

2. The hydraulic cylinder according to claim 1, characterized in that: The sealing member comprises a first sealing ring, which is arranged in the installation groove, and a gap is provided between an inner peripheral wall of the first sealing ring and a bottom wall of the installation groove.

3. The hydraulic cylinder according to claim 2, characterized in that: It also includes a second sealing ring, wherein the second sealing ring is arranged on both sides of the first sealing ring.

4. The hydraulic cylinder according to claim 3, characterized in that: The two sides of the installation groove are provided with clamping grooves, and the two second sealing rings are arranged in the clamping grooves.

5. The hydraulic cylinder according to claim 4, characterized in that: The slot is filled with sealant to fix the second sealing ring.

6. The hydraulic cylinder according to claim 4, characterized in that: It also includes a pressing plate and an adjusting member. The pressing plate is arranged in the slot, and the adjusting member is connected to the pressing plate and is used to drive the pressing plate to press the second sealing ring.

7. The hydraulic cylinder according to claim 6, characterized in that: The adjusting member includes a screw rod and a fixing block arranged at one end of the screw rod, a countersunk hole, a threaded hole and a mounting hole are provided on the outer wall of the piston, the countersunk hole, the threaded hole and the mounting hole are coaxially arranged, and the two ends of the threaded hole are connected to the mounting hole and the countersunk hole, the mounting hole is communicated with the slot, the screw rod is arranged in the threaded hole, the fixing block is arranged in the countersunk hole, and a cross slot is provided on the fixing block.

8. The hydraulic cylinder according to claim 7, characterized in that: It also includes a connecting sleeve and a limit block, wherein the limit block is arranged in the mounting hole and connected to the pressing plate, the limit block is arranged in the connecting sleeve, and the other end of the screw rod is connected to the limit block.

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