Hydraulic oil cylinder with stable hydraulic oil inlet and outlet

Abstract

The hydraulic oil cylinder comprises a cylinder barrel, a piston arranged in the cylinder barrel in a sliding mode and a piston rod connected to the piston, oil ports used for being connected with oil nozzles are formed in the two ends of the side wall of the cylinder barrel, the hydraulic oil cylinder further comprises a guide sleeve and an end cover, and the guide sleeve and the end cover are installed at the two opposite ends of the cylinder barrel. The guide sleeve is arranged in one end of the cylinder barrel, a mounting groove for mounting a sealing ring is formed in the outer wall of the guide sleeve, a conical surface is arranged at one end, close to the end cover, of the guide sleeve, the conical surface corresponds to the oil port, a conical hole is formed in the inner side of the oil port, a hydraulic oil channel is formed between the hole wall of the conical hole and the conical surface, and the hydraulic oil channel is communicated with an inner cavity of the cylinder barrel and the oil port. According to the hydraulic oil cylinder with the stable hydraulic oil inlet and outlet, the inclined channel wall of the hydraulic oil channel can play a role in guiding a hydraulic oil flow channel, the flowability of the hydraulic oil during flow direction switching is enhanced, the phenomena of stroke blockage and the like can be effectively relieved, and meanwhile the arrangement of the conical surface is beneficial to installation of the sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and particularly to a hydraulic cylinder with stable inflow and outflow of hydraulic oil. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts the hydraulic energy of hydraulic oil into mechanical energy to achieve linear reciprocating motion. When in use, it can eliminate the deceleration device, has no transmission gap, and has a stable movement. Therefore, it is widely used in various mechanical hydraulic systems. A hydraulic cylinder generally includes a cylinder barrel, a piston rod, and a piston. The piston is connected to one end of the piston rod and can reciprocate in the cylinder barrel. During operation, by increasing or decreasing the amount of hydraulic oil on both sides of the piston in the cylinder barrel, the pressure of the hydraulic oil on the corresponding side is increased or decreased, thereby pushing the piston to move towards the side with relatively lower pressure. In order to achieve the inflow and outflow of hydraulic oil into and out of the cylinder barrel, nozzles need to be connected to the cylinder barrel. In the prior art, the nozzles are usually vertically connected to the cylinder barrel. Therefore, the flow direction of the hydraulic oil in the cylinder barrel is horizontal, and the flow direction of the hydraulic oil in the nozzle is vertical. When the hydraulic oil flows at the connection between the nozzle and the cylinder barrel, it needs to undergo a 90° flow direction change, resulting in poor fluidity and easily causing the telescopic movement of the hydraulic cylinder to be blocked, such as phenomena like stroke jamming and speed reduction, thereby affecting the normal operation of the hydraulic cylinder. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is that in the prior art, the fluidity of the hydraulic oil flowing into and out of the cylinder barrel is poor, which easily leads to unsmooth telescopic movement. Based on this, the utility model provides a hydraulic cylinder with stable inflow and outflow of hydraulic oil.

[0004] The technical solution adopted by the utility model to solve its technical problem is: a hydraulic cylinder with stable inflow and outflow of hydraulic oil, including a cylinder barrel, a piston slidably arranged in the cylinder barrel, and a piston rod connected to the piston. Oil ports for connecting nozzles are opened at both ends of the side wall of the cylinder barrel. The hydraulic cylinder further includes guide sleeves and end covers installed at opposite ends of the cylinder barrel. The piston rod penetrates through the guide sleeves. The guide sleeves are arranged inside one end of the cylinder barrel. An installation groove for installing a sealing ring is provided on the outer wall of the guide sleeve. One end of the guide sleeve close to the end cover is set as a conical surface, which corresponds to the oil port. A conical hole is opened inside the oil port. A hydraulic oil channel is formed between the hole wall of the conical hole and the conical surface. The hydraulic oil channel is communicated with the inner cavity of the cylinder barrel and the oil port.

[0005] Further, two retaining rings are convexly provided on the inner wall of the guide sleeve corresponding to the conical surface. A first sealing ring is installed in the space formed between the two retaining rings. The first sealing ring is extruded between the outer wall of the piston rod and the inner wall of the guide sleeve.

[0006] Further, on one side of the inner wall of the guide sleeve opposite to the retaining ring, a sealing groove is formed, and a second sealing ring is installed in the sealing groove, and the second sealing ring abuts against the outer wall of the piston rod.

[0007] Further, at one end of the guide sleeve opposite to the conical surface, a retaining flange is formed by extending radially outward along the guide sleeve. When the retaining flange abuts against the end of the cylinder barrel, the conical surface corresponds to the oil port.

[0008] Further, the central axis of the oil port is perpendicular to the central axis of the cylinder barrel.

[0009] Further, the oil nozzle has a cylindrical structure with both ends penetrating, and the inner cavity of the oil nozzle is a circular through hole and is coaxially arranged with the oil port.

[0010] Further, at one end of the piston rod extending outside the cylinder barrel and on the end cover, connection sleeves are fixedly connected.

[0011] The beneficial effects of the present utility model are as follows: The hydraulic cylinder with stable inlet and outlet of hydraulic oil of the present utility model is provided with a conical surface at one end of the guide sleeve close to the oil port, and the conical surface corresponds to the oil port, and together with the conical hole inside the oil port, it constitutes a hydraulic oil channel. The inclined channel wall of this channel can play a guiding role in the flow path of the hydraulic oil, reducing the difficulty of switching the flow direction of the hydraulic oil, enhancing the fluidity when the flow direction of the hydraulic oil is switched, effectively alleviating phenomena such as stroke jamming, ensuring the stable inlet and outlet of the hydraulic oil and the stable operation of the hydraulic cylinder. At the same time, the setting of the conical surface is beneficial to the quick installation of the sealing ring, reducing the installation difficulty and improving the installation efficiency. The structural design is reasonable and ingenious, and it is convenient for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0013] Figure 1 is a perspective view of the hydraulic cylinder with stable inlet and outlet of hydraulic oil of the present utility model;

[0014] Figure 2 is Figure 1 the top view of the hydraulic cylinder with stable inlet and outlet of hydraulic oil shown;

[0015] Figure 3 is Figure 2 the sectional view of the hydraulic cylinder with stable inlet and outlet of hydraulic oil shown along A - A;

[0016] Figure 4 is Figure 2 the partial enlarged view at B of the hydraulic cylinder with stable inlet and outlet of hydraulic oil shown.

[0017] In the figure: 1. Cylinder barrel, 11. Oil port, 111. Tapered hole, 2. Piston, 3. Piston rod, 31. Connecting sleeve, 4. Oil nozzle, 5. Guide sleeve, 51. Installation groove, 52. Tapered surface, 520. Hydraulic oil passage, 53. Retaining ring, 531. First sealing ring, 54. Sealing groove, 541. Second sealing ring, 55. Supporting flange, 6. End cover. Detailed implementation mode

[0018] Now, the present utility model will be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic manner, so it only shows the components related to the present utility model.

[0019] Please refer to Figures 1-4 , the present utility model provides a hydraulic cylinder with stable hydraulic oil inlet and outlet, including a cylinder barrel 1, a piston 2 and a piston rod 3. The piston 2 is slidably arranged in the cylinder barrel 1 along the axial direction of the cylinder barrel 1. One end of the piston rod 3 is connected to the piston 2 and is coaxially arranged with the cylinder barrel 1. Oil nozzles 4 are respectively arranged at both ends of the cylinder barrel 1. The oil nozzles 4 are communicated with the inner cavity of the cylinder barrel 1. The piston 2 moves within the area defined between the two oil nozzles 4. During operation, one oil nozzle 4 is used to inject hydraulic oil into the space on one side of the piston 3 in the cylinder barrel 1, and the other oil nozzle 4 is used to discharge the hydraulic oil on the other side of the piston 3 in the cylinder barrel 1. The cooperation of the inlet and outlet of the hydraulic oil enables the piston 2 to make a reciprocating motion in the cylinder barrel 1.

[0020] The cylinder barrel 1 is generally in a cylindrical structure with both ends penetrating. Oil ports 11 are opened on both opposite sides of the outer side of the cylinder barrel 1. The oil ports 11 are circular through holes, and the oil ports 11 are communicated with the inner cavity of the cylinder barrel 1. The central axis of the oil port 11 is perpendicular to the central axis of the cylinder barrel 1. The oil nozzle 4 is fixedly connected to the outer wall of the cylinder barrel 1. The inlet and outlet oil passage of the oil nozzle 4 is communicated with the inner cavity of the cylinder barrel 1 through the oil port 11. In this embodiment, the oil nozzle 4 is in a cylindrical structure with both ends penetrating. The inner cavity of the oil nozzle 4 is a circular through hole and is coaxially arranged with the oil port 11.

[0021] The hydraulic cylinder with stable hydraulic oil inlet and outlet of the present utility model further includes a guide sleeve 5 and an end cover 6. The guide sleeve 5 is installed at one end of the cylinder barrel 1, and the end cover 6 is installed at the other end of the cylinder barrel 1 and closes the port of this end of the cylinder barrel 1. The guide sleeve 5 penetrates through both ends, and the piston rod 3 slidably penetrates through the guide sleeve 5.

[0022] In this embodiment, the guide sleeve 5 is in a cylindrical structure with both ends penetrating. The guide sleeve 5 is installed inside one end of the cylinder barrel 1. In order to improve the sealing performance between the guide sleeve 5 and the cylinder barrel 1 and prevent hydraulic oil leakage, an installation groove 51 is formed by radially inwardly recessing the outer wall of the guide sleeve 5 along the radial direction of the guide sleeve 5. A sealing ring 7 is installed in the installation groove 51. The sealing ring 7 is made of silica gel or rubber material. When the guide sleeve 5 is connected to the cylinder barrel 1 in place, the sealing ring 7 is squeezed between the guide sleeve 5 and the cylinder barrel 1, thereby realizing the sealing effect on the hydraulic oil.

[0023] During installation, the sealing ring 7 slides into the installation groove 51 through one end of the guide sleeve 5. One side of the guide sleeve 5 close to the end cover 6 is provided with a conical surface 52. In this way, the user can easily sleeved the sealing ring 7 on the outer wall of the guide sleeve 5 through the conical surface 52 and further push the sealing ring 7 into the installation groove 51, which is beneficial for the user to quickly install the sealing ring 7.

[0024] In this embodiment, the conical surface 52 corresponds to the oil port 11. A conical hole 111 is provided inside the oil port 11. A hydraulic oil channel 520 is formed between the hole wall of the conical hole 111 and the conical surface 52. The hydraulic oil channel 520 is communicated with both the inner cavity of the cylinder barrel 1 and the oil port 11. During operation, whether the hydraulic oil enters the cylinder barrel 1 through the oil port 11 or flows from the cylinder barrel 1 into the oil port 11, the flow path of the hydraulic oil will first pass through the hydraulic oil channel 520. The inclined channel wall on the hydraulic oil channel 520 can guide the flow path of the hydraulic oil, enhance the fluidity when the flow direction of the hydraulic oil is switched, effectively relieve phenomena such as stroke jamming, and ensure the stable operation of the hydraulic cylinder.

[0025] Furthermore, two retaining rings 53 are convexly provided on the inner wall of the guide sleeve 5 corresponding to the conical surface 52. A first sealing ring 531 is installed in the space formed between the two retaining rings 53. When the piston rod 3 passes through the guide sleeve 5, the first sealing ring 531 is squeezed between the outer wall of the piston rod 3 and the inner wall of the guide sleeve 5, thereby achieving a sealing effect and preventing the leakage of hydraulic oil. At the same time, by providing two retaining rings 53, the structural strength of the end of the guide sleeve 5 with the conical surface 52 is enhanced, ensuring the structural stability at the conical surface 52 and preventing it from deforming under the action of high-intensity hydraulic pressure.

[0026] In addition, a sealing groove 54 is provided on the inner wall of the guide sleeve 5 on the side opposite to the retaining ring 53. A second sealing ring 541 is installed in the sealing groove 54. The second sealing ring 541 abuts against the outer wall of the piston rod 3, thereby achieving a secondary sealing effect on the hydraulic oil.

[0027] As a preferred embodiment, a supporting flange 55 is formed on one end of the guide sleeve 5 opposite to the conical surface 52 and extends radially outward along the guide sleeve 5. The supporting flange 55 can abut against the end of the cylinder barrel 1. When installing the guide sleeve 5, the guide sleeve 5 is axially inserted into one end of the cylinder barrel 1. When the supporting flange 55 on the guide sleeve 5 abuts against the side wall of one end of the cylinder barrel 1, the guide sleeve 5 is installed in place. At this time, the conical surface 52 just corresponds to the oil port 11, which is convenient for the user to quickly complete the installation process of the guide sleeve 5. In addition, the guide sleeve 5 and the cylinder barrel 1 can be fixed by interference fit or welding. At the same time, the end cover 6 and the cylinder barrel 1 are fixed by welding.

[0028] Furthermore, connection sleeves 31 are fixedly connected to both the end of the piston rod 3 extending outside the cylinder barrel 1 and the end cover 6. The two connection sleeves 31 are respectively used to connect the base and the driven member, so as to meet the installation requirements of the hydraulic cylinder.

[0029] In addition, a conical surface 52 is also provided on the side of the end cover 6 close to the guide sleeve 5. When the end cover 6 is installed in place, the conical surface 52 can be aligned with an oil port 11 on the other side of the cylinder barrel 1, so as to realize the guiding function of the hydraulic oil flowing in and out of the oil port 11. Similarly, a tapered hole 111 is also provided at the oil port 11 close to the end cover 6, and it forms a hydraulic oil channel 520 together with the conical surface 52 for the hydraulic oil to flow in and out. The specific setting method is the same as the foregoing, and will not be elaborated here.

[0030] For the hydraulic cylinder with stable inflow and outflow of hydraulic oil of the present utility model, a conical surface 52 is provided at one end of the guide sleeve 5 close to the oil port 11, and the conical surface 52 corresponds to the oil port 11, and together with the tapered hole 111 inside the oil port 11, a hydraulic oil channel 520 is formed. The inclined channel wall of this channel can guide the flow path of the hydraulic oil, reduce the difficulty of switching the flow direction of the hydraulic oil, enhance the fluidity when the flow direction of the hydraulic oil is switched, effectively alleviate phenomena such as stroke jamming, and ensure the stable inflow and outflow of the hydraulic oil and the stable operation of the hydraulic cylinder. At the same time, the setting of the conical surface 52 is beneficial to the quick installation of the sealing ring 7, reduces the installation difficulty, improves the installation efficiency, and has a reasonable and ingenious structural design, which is convenient for popularization and use.

[0031] Inspired by the above ideal embodiments according to the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydraulic cylinder with stable hydraulic oil inlet and outlet, comprising a cylinder barrel, a piston slidably arranged in the cylinder barrel, and a piston rod connected to the piston. Oil ports for connecting oil nozzles are opened at both ends of the side wall of the cylinder barrel. It is characterized in that: It further includes guide sleeves and end caps installed at opposite ends of the cylinder barrel. The piston rod penetrates through the guide sleeves. The guide sleeves are arranged inside one end of the cylinder barrel. An installation groove for installing a sealing ring is provided on the outer wall of the guide sleeve. One end of the guide sleeve close to the end cap is set as a conical surface, which corresponds to the oil port. A conical hole is opened inside the oil port. A hydraulic oil passage is formed between the hole wall of the conical hole and the conical surface. The hydraulic oil passage is communicated with the inner cavity of the cylinder barrel and the oil port.

2. The hydraulic cylinder with stable hydraulic oil inlet and outlet according to claim 1, characterized in that: Two retaining rings are convexly provided on the inner wall of the guide sleeve corresponding to the conical surface. A first sealing ring is installed in the space formed between the two retaining rings. The first sealing ring is pressed between the outer wall of the piston rod and the inner wall of the guide sleeve.

3. The hydraulic cylinder with stable hydraulic oil inlet and outlet according to claim 2, characterized in that: A sealing groove is opened on one side of the inner wall of the guide sleeve opposite to the retaining ring. A second sealing ring is installed in the sealing groove. The second sealing ring abuts against the outer wall of the piston rod.

4. The hydraulic cylinder with stable hydraulic oil inlet and outlet as described in claim 1, characterized in that: One end of the guide sleeve opposite to the conical surface extends radially outward along the guide sleeve to form a retaining flange. When the retaining flange abuts against the end of the cylinder barrel, the conical surface corresponds to the oil port.

5. The hydraulic cylinder with stable hydraulic oil inlet and outlet according to claim 1, characterized in that: The central axis of the oil port is perpendicular to the central axis of the cylinder barrel.

6. The hydraulic cylinder with stable hydraulic oil inlet and outlet according to claim 5, characterized in that: The oil nozzle has a cylindrical structure with both ends communicating. The inner cavity of the oil nozzle is a circular through hole and is coaxially arranged with the oil port.

7. The hydraulic cylinder with stable hydraulic oil inlet and outlet according to claim 1, characterized in that: Connection sleeves are fixedly connected to one end of the piston rod extending outside the cylinder barrel and the end cap respectively.

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