Piston assembly of hydraulic breaking hammer

Abstract

The hydraulic breaking hammer piston assembly comprises a piston, an impeller and a set screw, the impeller is installed at the tail of the piston through the set screw, and when the piston reciprocates, high-pressure nitrogen in a nitrogen chamber can push the impeller to rotate so as to drive the piston to rotate. The piston rotates to generate an oil film between the piston and the piston cylinder, and due to the fact that relative rotation exists between the piston and the piston cylinder, the phenomenon that the piston and the piston cylinder are stuck to cause cylinder score is avoided. Wherein the rotating direction of the impeller is the same as the tightening direction of the set screw, and the problem of looseness of the impeller is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic breaker hammers, and in particular to a piston assembly 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 assembly consists of a piston and an impeller, the impeller is installed at the tail of the piston, and the piston assembly is installed in a nitrogen chamber. When the piston reciprocates, the high-pressure nitrogen in the nitrogen chamber pushes the impeller, thereby driving the piston to rotate, generating an oil film between the piston cylinder and the piston, and since there is relative rotation between the piston and the piston cylinder, the piston and the piston cylinder will not be stuck and the cylinder will not be pulled.

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

[0009] Figure 2 It is an assembly cross-sectional view of embodiment 1 of the present invention.

[0010] Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention.

[0011] Figure 4 This is an assembly cross-sectional view of Example 2 of the present invention.

[0012] Explanation of reference numerals: 1 piston, 2 impeller, 3 set screw, 4 piston cylinder, 5 nitrogen chamber.

[0013] In the attached Figure 1 In the embodiment, the impeller 2 is arranged at the tail of the piston 1 and is fastened by a set screw 3.

[0014] In the attached Figure 2 In the figure, the piston 1 is installed in the piston cylinder 4, and the tail of the piston 1 and the impeller 2 are installed in the nitrogen chamber on the right side of the piston cylinder 4. When the piston 1 and the impeller 2 move to the right, the high-pressure nitrogen in the nitrogen chamber 5 drives the impeller 2 to rotate, thereby driving the piston 1 to rotate. When the piston 1 rotates, an oil film will be generated between the piston 1 and the piston cylinder 4. At the same time, the rotation of the piston 1 changes the relative position of the piston 1 and the piston cylinder 4, avoiding continuous friction somewhere between the piston 1 and the piston cylinder 4, thereby avoiding the occurrence of the cylinder pulling phenomenon.

[0015] In the attached Figure 3 In the embodiment, the impeller 2 is a double-sided impeller, which is arranged at the tail of the piston 1 and is fastened by a set screw 3.

[0016] In the attached Figure 4 In the figure, the piston 1 is installed in the piston cylinder 2, and the tail of the piston 1 and the impeller 2 are installed in the nitrogen chamber on the right side of the piston cylinder 4. When the piston 1 and the impeller 2 move to the right, the high-pressure nitrogen in the nitrogen chamber 5 pushes the impeller on the right side of the impeller 2 to rotate, thereby driving the piston 1 to rotate. When the piston 1 and the impeller 2 move to the left, the high-pressure nitrogen in the nitrogen chamber 5 pushes the impeller on the left side of the impeller 2 to rotate, thereby driving the piston 1 to rotate. When the piston 1 rotates, an oil film will be generated between the piston 1 and the piston cylinder 4. At the same time, the rotation of the piston 1 changes the relative position of the piston 1 and the piston cylinder 4, avoiding continuous friction somewhere between the piston 1 and the piston cylinder 4, thereby avoiding the occurrence of cylinder pulling.

[0017] In order to solve the loosening problem of the impeller 2, in the embodiment, the rotation direction of the impeller 2 and the tightening direction of the set screw 3 are set to the same direction. When the impeller 2 rotates, a torque in the tightening direction is applied to the set screw 3, thereby ensuring that the set screw 3 will not loosen.

[0018] Providing an impeller 2 at the tail of the piston 1 is a very convenient technical solution to solve the problem of cylinder pulling. This technical solution does not involve the oil circuit of the hydraulic breaker, so it will not have any impact on the working state of the hydraulic breaker; at the same time, this technical solution uses the high-pressure nitrogen in the existing nitrogen chamber 5 as power, does not add any other parts, and only adds the impeller 2 to realize the rotation of the piston 1, thereby solving the problem of cylinder pulling. It is a very low-cost technical solution.

Claims

1. A hydraulic breaker piston assembly, characterized in that: The piston assembly comprises a piston and an impeller, wherein the impeller is mounted at the tail of the piston.

2. A hydraulic breaker piston assembly according to claim 1, characterized in that: The impeller is a single-sided impeller.

3. A hydraulic breaker piston assembly according to claim 1, characterized in that: The impeller is a double-sided impeller.

4. A hydraulic breaker piston assembly according to claim 1, characterized in that: The impeller is fastened to the tail of the piston by a set screw, and the rotation direction of the impeller is the same as the tightening direction of the set screw.

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