Automatic pressure relief and oil return structure of hydraulic tool

Abstract

This utility model provides an automatic pressure relief and oil return structure for hydraulic tools, belonging to the field of hydraulic tool technology. It solves the problems of uncontrollable working pressure in existing hydraulic tools, their inability to meet different pressure conditions, and their limited operating environment. This automatic pressure relief and oil return structure for hydraulic tools includes a shell, an oil reservoir, and a cylinder. The cylinder has an interconnected oil inlet groove and a high-pressure feed chamber. An automatic pressure relief and oil return structure is installed within the cylinder, comprising a bushing, a spring, a top ball, and a push rod. The cylinder has an oil passage for mounting the bushing, spring, top ball, and push rod, connecting the oil inlet groove and the high-pressure feed chamber. The bushing has a pressure relief hole, the top ball seals against the pressure relief hole, and the top end of the push rod extends into the pressure relief hole and abuts against the top ball. The cylinder also has a return groove interconnected with the oil passage and the oil reservoir. This utility model has the advantages of unrestricted and self-adjustable working pressure, meeting different operating conditions, and improving the return oil speed.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic tool technology and relates to an automatic pressure relief and oil return structure for hydraulic tools. Background Technology

[0002] Currently, when hydraulic tools on the market return oil, the oil flows through a safety valve. The safety valve will only activate when the working pressure of the hydraulic tool is greater than the valve pressure of the safety valve, thus achieving the oil return effect.

[0003] However, the hydraulic tool has a relatively slow oil return speed, and the pressure must be greater than the safety valve pressure to release pressure, resulting in uncontrollable pressure and inability to meet the operation of different pressure conditions, thus restricting its use in various environments. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing an automatic pressure relief and oil return structure for hydraulic tools, whose working pressure can be adjusted to meet different usage environments.

[0005] The objective of this utility model can be achieved through the following technical solution: An automatic pressure relief and oil return structure for a hydraulic tool, the hydraulic tool comprising a shell, an oil reservoir, and a cylinder, wherein the cylinder has an interconnected oil inlet groove and a high-pressure feed chamber, characterized in that the cylinder is provided with an automatic pressure relief and oil return structure, the automatic pressure relief and oil return structure comprising a bushing, a spring, a top ball, and a push rod, the cylinder having an oil passage for mounting the bushing, spring, top ball, and push rod, and the oil passage connecting the oil inlet groove and the high-pressure feed chamber, the bushing having a pressure relief hole, the top ball sealingly pressing against the pressure relief hole, the top end of the push rod extending into the pressure relief hole and abutting against the top ball, the spring pressing against the top ball, and the cylinder also having an oil return groove interconnected with the oil passage and the oil reservoir.

[0006] In the above-mentioned automatic pressure relief and oil return structure of a hydraulic tool, the cylinder body has a through hole that allows the oil passage and the oil inlet groove to communicate with each other.

[0007] In the above-mentioned automatic pressure relief and oil return structure of a hydraulic tool, a pressure rod is also provided inside the outer shell, two rod seats are installed on the cylinder body, the pressure rod is movably disposed between the two rod seats, and the top end of the pressure rod presses against the push rod and drives the push rod to extend and retract.

[0008] In the aforementioned automatic pressure relief and oil return structure for a hydraulic tool, a piston ring is installed inside the high-pressure feed chamber.

[0009] Compared with existing technologies, the automatic pressure relief and oil return structure of this hydraulic tool has the advantages of unlimited and self-adjustable working pressure, meeting different operating conditions and improving oil return speed. Attached Figure Description

[0010] Figure 1This is a 3D view of the internal structure of the automatic pressure relief and oil return mechanism of this hydraulic tool.

[0011] Figure 2 This is a partial cross-sectional view from one perspective of the automatic pressure relief and oil return structure of this hydraulic tool.

[0012] Figure 3 This is a cross-sectional view of the cylinder block from another perspective.

[0013] In the diagram, 1. outer casing; 2. oil reservoir; 3. cylinder block; 4. oil inlet groove; 5. high-pressure feed chamber; 6. bushing; 7. spring; 8. top ball; 9. push rod; 10. oil passage; 11. pressure relief hole; 12. oil return groove; 13. through hole; 14. pressure rod; 15. rod seat; 16. piston ring. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0015] like Figures 1-3 As shown, this hydraulic tool has an automatic pressure relief and oil return structure. The hydraulic tool includes a housing 1, an oil reservoir 2, and a cylinder 3. The cylinder 3 has an interconnected oil inlet groove 4 and a high-pressure feed chamber 5. The cylinder 3 is equipped with an automatic pressure relief and oil return structure, which includes a bushing 6, a spring 7, a top ball 8, and a push rod 9. The cylinder 3 has an oil passage 10 for mounting the bushing 6, spring 7, top ball, and push rod 9. The oil passage 10 connects the oil inlet groove 4 and the high-pressure feed chamber 5. The bushing 6 has a pressure relief hole 11. The top ball 8 is sealed against the pressure relief hole 11. The top end of the push rod 9 extends into the pressure relief hole 11 and abuts against the top ball 8. The spring 7 abuts against the top ball 8. The cylinder 3 also has an oil return groove 12 that communicates with the oil passage 10 and the oil reservoir 2. The oil passage 10 has a groove that communicates with the oil return groove 12, and the oil return groove 12 is perpendicular to the oil passage 10.

[0016] The cylinder body 3 has a through hole 13 that allows the oil passage 10 and the oil inlet groove 4 to communicate with each other. One end of the spring 7 presses against the top ball 8, and the other end abuts against the wall of the through hole 13, which plays a supporting and restoring role.

[0017] Preferably, the outer casing 1 is further provided with a pressure rod 14, and two rod seats 15 are installed on the cylinder body 3. The pressure rod 14 is movably disposed between the two rod seats 15, and the top end of the pressure rod 14 presses against the top rod 9 and drives the top rod 9 to extend and retract.

[0018] Preferably, a piston ring 16 is provided inside the high-pressure feed chamber 5.

[0019] There is a button on the outer casing 1 to drive the pressure rod 14 to work. The button is linked to the pressure rod 14. When the steel ball closes the pressure relief hole 11, the oil in the oil inlet 4 enters the oil storage tank 2 and enters the high pressure feed chamber 5 to cause the piston ring 16 to work, and the hydraulic tool starts to work (the high pressure feed chamber 5 is equipped with a hydraulic clamp body assembly at the end, which causes the hydraulic clamp body assembly to open and close).

[0020] When the pressure rod 14 pushes open the pressure relief steel ball, the pressure can be released. The oil passes through the oil circuit 10 and returns to the oil storage tank 2 through the return oil groove 12. The return oil does not need to pass through the safety valve. The pressure can be adjusted according to the corresponding working conditions without considering the working pressure (the pressure is set by adjusting the pressure parameters according to the user's needs before leaving the factory).

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document frequently uses terms such as outer shell 1, oil reservoir 2, cylinder block 3, oil inlet groove 4, high-pressure feed chamber 5, bushing 6, spring 7, top ball 8, top rod 9, oil passage 10, pressure relief hole 11, oil return groove 12, through hole 13, pressure rod 14, rod seat 15, piston ring 16, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. An automatic pressure relief and oil return structure for a hydraulic tool, the hydraulic tool comprising a housing (1), an oil reservoir (2), and a cylinder (3), wherein the cylinder (3) has an interconnected oil inlet groove (4) and a high-pressure feed chamber (5), characterized in that, The cylinder body (3) is provided with an automatic pressure relief and oil return structure, which includes a bushing (6), a spring (7), a top ball (8), and a push rod (9). The cylinder body (3) has an oil passage (10) for the bushing (6), spring (7), top ball, and push rod (9) to be installed. The oil passage (10) is connected between the oil inlet groove (4) and the high pressure feed chamber (5). The bushing (6) has a pressure relief hole (11). The top ball (8) is sealed against the pressure relief hole (11). The top end of the push rod (9) extends into the pressure relief hole (11) and abuts against the top ball (8). The spring (7) abuts against the top ball (8). The cylinder body (3) also has an oil return groove (12) that communicates with the oil passage (10) and the oil storage chamber (2).

2. The automatic pressure relief and oil return structure for a hydraulic tool according to claim 1, characterized in that, The cylinder body (3) has a through hole (13) that allows the oil passage (10) and the oil inlet groove (4) to communicate with each other.

3. The automatic pressure relief and oil return structure for a hydraulic tool according to claim 1, characterized in that, The outer shell (1) is also provided with a pressure rod (14), and two rod seats (15) are installed on the cylinder (3). The pressure rod (14) is movably arranged between the two rod seats (15), and the top of the pressure rod (14) presses against the top rod (9) and drives the top rod (9) to extend and retract.

4. The automatic pressure relief and oil return structure for a hydraulic tool according to claim 1, characterized in that, The high-pressure feed chamber (5) is equipped with piston rings (16).

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