Piston of hydraulic breaking hammer

Abstract

A spiral oil groove is formed in a piston rod, when the two ends of the spiral oil groove are connected with high pressure and low pressure of hydraulic oil respectively, the hydraulic oil can push the piston to rotate, so that an oil film is generated between the piston and a piston cylinder, and due to relative rotation between the piston and the piston cylinder, the oil film can be prevented from falling off. And the phenomenon that the piston and the piston cylinder are stuck to cause cylinder score is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic breaker hammers, and in particular to a piston of a breaker hammer. Background Art

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

[0003] The working principle of hydraulic breaker is: the hydraulic output pressure oil of excavator and loader is used as the power, and the reciprocating motion of piston is controlled by the reversing valve. When the piston moves, it impacts the drill rod, and the drill rod impacts the target object, thereby achieving the purpose of breaking the target object.

[0004] When the breaker hammer is working, since the target object hit by the drill rod is irregular, the drill rod will not move strictly along the axial direction, and will produce a certain lateral force on the piston, causing the piston to tilt to a certain extent inside the piston cylinder. At this time, the piston and the piston cylinder are in direct contact, which further causes the piston and the piston cylinder to be strained, affecting the operation of the breaker hammer and even damaging the piston and the piston cylinder of the breaker hammer.

[0005] Patent document No. CN117266298A discloses a hydraulic breaker with an anti-cylinder pull-out feature, which uses a suspension device to suspend the piston, thereby solving the cylinder pull-out problem. However, the suspension device has a complex structure and is difficult to solve the cylinder pull-out problem. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a technical solution that can completely solve the cylinder pulling 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 the 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, and because there is relative rotation between the piston and the piston cylinder, the piston and the piston cylinder will not get stuck and pull the cylinder.

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

[0009] Figure 2 This is a schematic diagram of the structure of Example 2 of the present invention.

[0010] Figure 3 This is a schematic diagram of the structure of Example 3 of the present invention.

[0011] Figure 4 This is a schematic diagram of the structure of Example 4 of the present invention.

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

[0013] In the attached Figure 1 In the figure, the spiral oil groove 8 is arranged on the second piston boss 5, the front end of the second piston boss 5 is connected to the piston cylinder low-pressure oil chamber 13, and the rear end of the second piston boss 5 is connected to the piston cylinder variable pressure chamber 14. When the piston cylinder variable pressure chamber 14 is high pressure, the high-pressure oil enters the piston cylinder low-pressure chamber 13 through the spiral oil groove 8, pushing the piston 1 to rotate.

[0014] In the attached Figure 2 In the figure, the spiral oil groove 8 is arranged at both ends of the first boss 3 of the piston, and 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 passes through the front section of the spiral oil groove 8 and the oil hole 9 inside the piston into the rear section of the spiral oil groove 8 and then into the low-pressure chamber 13 of the piston cylinder, pushing the piston 1 to rotate.

[0015] In the attached Figure 3 In the figure, the spiral oil groove 8 is arranged on the front part 2 of the piston, and the second low-pressure chamber 15 of the piston cylinder is arranged in the front part of the piston cylinder 10. The high-pressure oil in the piston high-pressure chamber 11 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 the attached Figure 4 In the figure, a third piston boss 6 is arranged on the piston 1, a spiral oil groove 8 is arranged on the third piston boss 6, and a second high-pressure chamber 16 of the piston cylinder is arranged on the piston cylinder 10. When the high-pressure oil in the second high-pressure chamber 16 enters the low-pressure chamber 13 of the piston cylinder through the spiral oil groove 8, the piston 1 is pushed 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 at any section of the piston 1, but it is necessary to ensure 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 configured as a single-line spiral groove, or can be configured as a multi-line spiral groove in order to increase the rotation speed of the piston 1 .

[0020] Although the high-pressure oil will consume some flow of the hydraulic system when passing through the spiral oil groove 8, since the cross-sectional area of ​​the spiral groove 8 is not large, the consumed flow is limited and has little effect 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 according to claim 1, characterized in that: The spiral oil groove is arranged on the second boss.

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

4. A hydraulic breaker piston as claimed in claim 1, characterized in that: The spiral oil groove is arranged at the front part of the piston.

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

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

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

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