Piston for hydraulic breaking hammer

Abstract

Disclosed in the present invention is a piston for a hydraulic breaking hammer. A spiral oil groove is formed on a piston rod. When two ends of the spiral oil groove are respectively connected to high-pressure hydraulic oil and low-pressure hydraulic oil, the hydraulic oil pushes the piston to rotate, thereby generating an oil film between the piston and a piston cylinder; in addition, owing to relative rotation between the piston and the piston cylinder, the phenomenon of cylinder scuffing due to seizure therebetween is avoided.

Description

A hydraulic breaker piston Technical Field

[0001] This invention relates to the field of hydraulic breaker technology, and more particularly to a piston for a hydraulic breaker. Background Technology

[0002] Hydraulic breakers are widely used in the demolition of roads and buildings, as well as in the crushing of rocks and minerals.

[0003] The working principle of a hydraulic breaker is as follows: Powered by the hydraulic pressure output of an excavator or loader, a piston reciprocates through a directional valve. As the piston moves, it impacts a chisel, which in turn impacts the target object, thus achieving the purpose of breaking the object.

[0004] When a hydraulic breaker is working, the target object struck by the chisel is irregular. Therefore, the chisel will not move strictly along the axial direction, which will generate a certain lateral force on the piston. This will cause the piston to tilt to a certain extent inside the piston cylinder. At this time, the piston and piston cylinder will come into direct contact, which will further cause scoring of the piston and piston cylinder, affecting the operation of the hydraulic breaker, and even damaging the piston and piston cylinder of the hydraulic breaker.

[0005] Patent document CN117266298A discloses a hydraulic breaker designed to prevent cylinder scoring, which uses a suspension device to suspend the piston, thereby solving the cylinder scoring problem. However, this suspension device has a complex structure and is difficult to use to solve the cylinder scoring problem. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a technical solution that can completely solve the cylinder scoring problem.

[0007] The present invention is designed as follows: a hydraulic breaker piston has a spiral oil groove on its piston rod. One end of the spiral groove is connected to a high-pressure oil chamber and the other end is connected to a low-pressure oil chamber. When high-pressure oil passes through the spiral oil groove, it pushes the piston to rotate, generating an oil film between the piston cylinder and the piston. Due to the relative rotation between the piston and the piston cylinder, the piston and piston cylinder will not jam and cause cylinder scoring.

[0008] Figure 1 is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0009] Figure 2 is a structural schematic diagram of Embodiment 2 of the present invention.

[0010] Figure 3 is a structural schematic diagram of Embodiment 3 of the present invention.

[0011] Figure 4 is a structural schematic diagram of Embodiment 4 of the present invention.

[0012] Explanation of reference numerals in the attached drawings: 1 Piston, 2 Piston front, 3 Piston first boss, 4 Piston middle, 5 Piston second boss, 6 Piston third boss, 7 Piston rear, 8 Spiral oil groove, 9 Piston internal oil hole, 10 Piston cylinder, 11 Piston cylinder high-pressure chamber, 12 Piston cylinder signal chamber, 13 Piston cylinder low-pressure chamber, 14 Piston cylinder transformer chamber, 15 Piston cylinder second low-pressure chamber, 16 Piston cylinder second high-pressure chamber.

[0013] In Figure 1, the spiral oil groove 8 is provided on the second protrusion 5 of the piston. The front end of the second protrusion 5 of the piston is connected to the low-pressure oil chamber 13 of the piston cylinder, and the rear end of the second protrusion 5 of the piston is connected to the pressure-changing chamber 14 of the piston cylinder. When the pressure-changing chamber 14 of the piston cylinder is at high pressure, the high-pressure oil enters the low-pressure chamber 13 of the piston cylinder through the spiral oil groove 8, pushing the piston 1 to rotate.

[0014] In Figure 2, the spiral oil grooves 8 are provided at both ends of the first protrusion 3 of the piston. The spiral oil grooves 8 at both ends are connected through the oil holes 9 inside the piston. The high-pressure oil in the high-pressure chamber 11 of the hydraulic cylinder enters the rear section of the spiral oil grooves 8 through the oil holes 9 inside the piston and then enters the low-pressure chamber 13 of the piston cylinder, pushing the piston 1 to rotate.

[0015] In Figure 3, a spiral oil groove 8 is provided on the front part 2 of the piston, and a second low-pressure chamber 15 of the piston cylinder is provided at the front part of the piston cylinder 10. The high-pressure oil in the high-pressure chamber 11 of the piston enters the second low-pressure chamber 15 of the piston cylinder through the spiral oil groove 8, pushing the piston 1 to rotate.

[0016] In Figure 4, a third piston boss 6 is provided on piston 1, a spiral oil groove 8 is provided on the third piston boss 6, and a second high-pressure chamber 16 is provided on piston cylinder 10. When the high-pressure oil in the second high-pressure chamber 16 enters the low-pressure chamber 13 of piston cylinder through the spiral oil groove 8, it pushes piston 1 to rotate.

[0017] It should be noted that the spiral oil groove 8 is a relatively simple way to achieve piston rotation. The oil groove can also be set in other forms, but it is necessary to ensure that the inlet and outlet of the oil groove are not in the same radial position.

[0018] It should be noted that the spiral oil groove 8 can be set on any section of the piston 1, but it must be ensured that the front end and the rear end of the spiral oil groove 8 are connected to the high-pressure oil chamber and the low-pressure oil chamber of the piston cylinder 10, respectively.

[0019] The spiral oil groove 8 can be set as a single-line spiral groove, or it can be set as a multi-line spiral groove to increase the rotational speed of the piston 1.

[0020] Although the high-pressure oil passing through the spiral oil groove 8 will consume some flow of the hydraulic system, the flow consumed is limited because the cross-sectional area of ​​the spiral groove 8 is not large, and it has little impact on the working state of the hydraulic breaker.

Claims

1. A hydraulic breaker piston, comprising a piston front section, a first boss, and a second boss, characterized in that, There is a spiral oil groove in the piston rod.

2. A hydraulic breaker piston as described in claim 1, characterized in that, The spiral oil groove is located on the second boss.

3. A hydraulic breaker piston as described in claim 1, characterized in that, The spiral oil groove is located on the first boss and at both ends of the first boss. The spiral oil grooves at both ends are connected through the oil holes inside the piston.

4. A hydraulic breaker piston as described in claim 1, characterized in that, The spiral oil groove is located at the front of the piston.

5. A hydraulic breaker piston as described in claim 1, further comprising a third boss, characterized in that, The spiral oil groove is located on the third protrusion of the piston.

6. A hydraulic breaker piston as described in claim 1, characterized in that, The spiral oil groove is a single-line spiral oil groove.

7. A hydraulic breaker piston as described in claim 1, characterized in that, The spiral oil groove is a multi-line spiral oil groove.

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