Oil cylinder with built-in safety valve

Abstract

The oil cylinder comprises a cylinder body, a piston and a piston rod, a check ring is arranged at the end of the cylinder body, the safety valve is arranged in the check ring, an inner cavity of the cylinder body is communicated with the outside when the safety valve is opened, and a baffle ring for shielding an outlet of the safety valve is arranged at the outlet end of the safety valve. And a gap is reserved between the baffle ring and the outlet end of the safety valve. According to the utility model, overflowing hydraulic oil can be prevented from splashing, and collision damage caused by convex parts is reduced.

Description

Technical Field

[0001] The utility model relates to an oil cylinder, in particular to an oil cylinder with an internally mounted safety valve. Background Art

[0002] An oil cylinder is a common hydraulic actuator. The cylinder body of the oil cylinder is divided into two working chambers by a piston, namely a rod chamber and a rodless chamber. The movement of the piston is controlled by controlling the oil pressure in the rod chamber and the rodless chamber. Generally, a safety valve needs to be installed in the rod chamber to control the upper limit of the oil pressure, so that the hydraulic oil can be discharged after the rod chamber is overpressured. In the prior art, the safety valve is usually installed on the circumferential surface of the cylinder body. After the cylinder body is overpressured, the hydraulic oil leaks from the safety valve to the outside of the oil cylinder, and the directly ejected hydraulic oil may hurt people or objects near the hydraulic oil outlet of the safety valve. In addition, the external installation of the safety valve increases the external dimension of the oil cylinder, and it is easy to be knocked or damaged during transportation or handling, resulting in the failure of the safety valve and affecting the normal use of the oil cylinder. Content of the Utility Model

[0003] Aiming at the above-mentioned defects of the prior art, the task of the utility model is to provide an oil cylinder with an internally mounted safety valve to solve the problems of splashing of the safety valve and easy knocking during transportation and handling.

[0004] The technical solution of the utility model is as follows: An oil cylinder with an internally mounted safety valve, including a cylinder body, a piston and a piston rod. A stop ring is provided at the end of the cylinder body, and a safety valve is arranged inside the stop ring. When the safety valve is opened, the inner cavity of the cylinder body is communicated with the outside world. A retaining ring covering the outlet of the safety valve is provided at the outlet end of the safety valve, and a gap is left between the retaining ring and the outlet end of the safety valve.

[0005] Further, the retaining ring is provided with an oil leakage port, the oil leakage port is arranged deviating from the outlet end of the safety valve, and the oil leakage port is communicated with the outlet end of the safety valve through the gap.

[0006] Further, the axis of the oil leakage port is arranged parallel to the axial direction of the cylinder body.

[0007] Further, the stop ring is provided with a valve cavity. A diversion channel communicated with the gap is provided at one end of the valve cavity far from the inner cavity of the cylinder body. The safety valve includes a spring, a valve core and a valve seat. The valve seat is provided at one end of the valve cavity close to the inner cavity of the cylinder body. The valve seat is provided with a valve hole communicating the inner cavity of the cylinder body and the valve cavity. The spring presses the valve core against the valve seat to close the valve hole.

[0008] Further, the head end of the valve core is conical.

[0009] Further, the valve seat is threadedly connected with the stop ring.

[0010] Furthermore, the end face of the valve seat is lower than the side of the stop ring facing the piston.

[0011] The advantages of the present utility model compared with the prior art are as follows:

[0012] The present utility model integrates the safety valve on the stop ring and sets a retaining ring at the outlet of the safety valve to prevent the oil splashing from the safety valve from hurting the operator. The leaked oil will not drip onto the ground immediately, providing a longer adjustment time to control the oil pressure. The safety valve on the stop ring is inside the oil cylinder, so the external dimension of the oil cylinder remains regular without additional protruding parts, which does not occupy the packaging size and is not easily damaged externally. Description of the Drawings

[0013] Figure 1 It is a sectional structure schematic diagram of the oil cylinder with the safety valve built in for the embodiment.

[0014] Figure 2 It is Figure 1 a partial structure schematic diagram at position A in Detailed Embodiment

[0015] The following further illustrates the present utility model in conjunction with the embodiments, but it is not a limitation to the present utility model.

[0016] Please refer to Figure 1 and Figure 2 As shown, an oil cylinder with a built-in safety valve in this embodiment includes a cylinder block 1, a piston 2 and a piston rod 3. The piston rod 3 is connected to the piston 2. The piston 2 moves up and down in the cylinder block 1 with different oil pressures on both sides of the piston 2, thereby driving the piston rod 3 to move up and down to achieve the basic functions of the oil cylinder.

[0017] Both ends of the cylinder block 1 are sealed by setting stop rings 4 and the moving distance of the piston 2 is limited. The piston 2 divides the inner cavity of the cylinder block 1 into a rod chamber 5 (i.e., the chamber on the side where the piston rod is located) and a rodless chamber 6. In the prior art, a safety valve is installed on the side wall of the cylinder block 1 to control the overpressure of the rod chamber. In this embodiment, the safety valve is embedded in the stop ring 4, thereby avoiding the formation of protruding parts on the side wall of the cylinder block 1 that affect packaging and may cause collision damage.

[0018] Specifically, a valve cavity is provided on the stop ring 4. The valve cavity includes a first cavity 7 and a second cavity 8. The first cavity 7 is arranged on the side of the stop ring 4 close to the rod cavity 5, that is to say, the first cavity 7 is the end of the valve cavity close to the inner cavity of the cylinder block 1, and the second cavity 8 is the end of the valve cavity far from the inner cavity of the cylinder block 1. The first cavity 7 and the second cavity 8 are coaxially arranged, and the diameter of the first cavity 7 is larger than that of the second cavity 8. The safety valve consists of a spring 9, a valve core 10 and a valve seat 11. The spring 9 is placed in the second cavity 8. One end of the spring 9 abuts against the bottom of the second cavity 8, and the other end is connected to the valve core 10. A guide post can be provided at the tail end of the valve core 10, and the spring 9 is sleeved on the guide post to control the valve core 10. The valve seat 11 is installed in the first cavity 7 by threaded connection. After installation, the end face of the valve seat 11 should be lower than the side of the stop ring 4 facing the piston 2, that is, it does not protrude from the stop ring 4, so as not to affect the movement of the piston 2. The spring 9 presses the valve core 10 against the valve seat 11. The head end of the valve core 10 is conical. A valve hole 12 is provided on the valve seat 11. When the valve core 10 abuts against the valve seat 11, the valve hole 12 is closed by the head end of the valve core 10. The conical setting can make the valve core 10 better close the valve hole 12. The installation depth of the valve seat 11 can be adjusted by threading, and then the preset elastic force of the spring 9 can be adjusted to change the pressure relief pressure of the safety valve. A diversion channel 13 communicating with the stop ring 4 is also provided at the bottom of the second cavity 8, and the end of the diversion channel 13 forms the outlet end of the safety valve. In this way, when the oil pressure in the rod cavity 5 is too high and the valve core 10 is pushed open, the oil fluid can enter the valve cavity through the valve hole 12 and then flow out through the diversion channel 13 through the stop ring 4.

[0019] On the cylinder block 1, a retaining ring 14 is also provided outside the stop ring 4. The retaining ring 14 can be installed in threaded fit with the cylinder block 1. The retaining ring 14 can shield the outlet end (diversion channel 13) of the safety valve and leave a gap 15 between it and the outlet end of the safety valve. In this way, the oil fluid flowing out from the outlet end of the safety valve will not splash directly outward. Further, an oil leakage port 16 is provided on the retaining ring 14. The axis of the oil leakage port 16 is arranged parallel to the axis of the cylinder block 1, and the oil leakage port 16 is arranged deviating from the outlet end of the safety valve. The diameter of the oil leakage port 16 is much larger than the cross-section of the gap 15. The oil fluid flowing out from the gap 15 further flows out from the oil leakage port 16, and the pressure is reduced, so that no jet is formed and the dripping of the oil fluid is delayed.

Claims

1. A safety valve built-in oil cylinder, comprising a cylinder body, a piston and a piston rod, wherein a stop ring is provided at the end of the cylinder body, characterized in that: A safety valve is arranged in the stop ring. When the safety valve is opened, the inner cavity of the cylinder body is connected to the outside. A retaining ring for shielding the outlet of the safety valve is arranged at the outlet end of the safety valve. A gap is left between the retaining ring and the outlet end of the safety valve.

2. The safety valve built-in cylinder according to claim 1, characterized in that: The retaining ring is provided with an oil leakage port, the oil leakage port is arranged away from the outlet end of the safety valve, and the oil leakage port is communicated with the outlet end of the safety valve through the gap.

3. The safety valve built-in cylinder according to claim 2, characterized in that: The axis of the oil leakage port is arranged parallel to the axial direction of the cylinder body.

4. The safety valve built-in cylinder according to claim 1, characterized in that: The stop ring is provided with a valve cavity, and the end of the valve cavity away from the inner cavity of the cylinder body is provided with a flow guide channel connected to the gap. The safety valve includes a spring, a valve core and a valve seat. The valve seat is provided at one end of the valve cavity close to the inner cavity of the cylinder body. The valve seat is provided with a valve hole connecting the inner cavity of the cylinder body and the valve cavity, and the spring presses the valve core against the valve seat to close the valve hole.

5. The safety valve built-in oil cylinder according to claim 4, characterized in that: The head end of the valve core is conical.

6. The safety valve built-in oil cylinder according to claim 4, characterized in that: The valve seat is threadedly connected to the stop ring.

7. The safety valve built-in cylinder according to claim 4, characterized in that: The end surface of the valve seat is lower than a surface of the stop ring facing the piston.

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