Piston assembly of hydraulic breaking hammer

Abstract

An external thread is arranged at the front part of a piston, an internal thread is arranged at the tail part of a drill rod, and the piston and the drill rod are connected through the external thread at the front part of the piston and the internal thread at the tail part of the drill rod; in order to prevent threads from loosening when the piston and the drill rod hit a target object, a drill rod nut is further arranged, and then the piston and the drill rod are connected through the drill rod nut.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic breaking, in particular to a piston and a drill rod of a hydraulic breaking 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 hits the target object, thereby achieving the purpose of breaking the target object.

[0004] In order to meet the working conditions of the drill rod, a drill rod seat is set. In order to limit the stroke of the drill rod, an inner bushing and an outer bushing are set. In order to prevent the drill rod from hitting empty, a buffer chamber is set at the front of the hydraulic cylinder and a flat pin is set on the drill rod seat. However, it is still impossible to prevent the drill rod from hitting empty. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention proposes a technical solution in which a piston is directly connected to a drill rod.

[0006] The present invention is designed in such a way that the front end of the piston is provided with a piston end external thread, the tail of the drill rod is provided with a drill rod internal thread, and the piston and the drill rod are connected through the piston front end external thread and the drill rod internal thread at the tail of the drill rod; in order to prevent the piston and the drill rod from loosening when striking a target object, a drill rod nut is also provided, and the piston and the drill rod are connected again through the drill rod nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the structure of Example 1.

[0008] Figure 2 This is a schematic diagram of the structure of Example 2.

[0009] Figure 3 This is a schematic diagram of the structure of Example 3.

[0010] Explanation of the reference numerals: 1 piston, 11 piston end external thread, 12 piston end external thread, 13 piston disassembly groove, 14 piston end internal thread, 2 drill rod, 21 drill rod internal thread, 22 drill rod disassembly groove, 23 drill rod boss, 24 drill rod external thread, 3 drill rod nut, 31 drill rod nut internal thread. DETAILED DESCRIPTION

[0011] In the attached Figure 1 In the embodiment, the front part of the piston 1 is provided with a piston end external thread 11, the rear part of the drill rod 2 is provided with a drill rod internal thread 21, and the piston 1 and the drill rod 2 are connected through the piston end external thread 11 and the drill rod internal thread 21.

[0012] In the attached Figure 2 In the embodiment, the front of the piston 1 is provided with a piston end internal thread 14, the rear of the drill rod 2 is provided with a drill rod external thread 24, and the piston 1 and the drill rod 2 are connected through the piston end internal thread 14 and the drill rod external thread 24.

[0013] In attachment 3, the front of the piston 1 is provided with a piston end external thread 11, and the rear of the drill rod 2 is provided with a drill rod internal thread 21. The piston 1 and the drill rod 2 are connected through the piston end external thread 11 and the drill rod internal thread 21. In order to prevent the threads between the piston 1 and the drill rod 2 from loosening, a drill rod nut 3 is further provided. The front part of the drill rod nut 3 cooperates with the drill rod boss 23, and the rear part of the drill rod nut 3 is provided with a drill rod nut internal thread 31 that cooperates with the piston end external thread 12, and the piston nut internal thread 31 on the drill rod nut 3 and the piston end external thread 12 on the piston 1 rotate in opposite directions to the piston end external thread 11 on the piston 1 and the drill rod internal thread 21 on the drill rod 2, which can play a role of mutual restraint. When there is a tendency for loosening between the piston end external thread 11 on the piston 1 and the drill rod internal thread on the drill rod 2, a force in the pre-tightening direction will be generated between the piston end external thread 12 on the piston 1 and the drill rod nut internal thread 31 on the drill rod nut 3, thereby preventing the piston end external thread 11 on the piston 1 and the drill rod internal thread on the drill rod 2 from loosening.

[0014] In order to facilitate the disassembly and assembly of the piston 1, the drill rod 2 and the drill rod nut 3, the drill rod nut 3 is set as a round nut, the piston 1 is provided with a piston disassembly groove 13, and the drill rod 2 is provided with a drill rod disassembly groove 22 to facilitate disassembly and assembly using a side hook wrench.

[0015] It should be noted that there are many ways to connect the piston to the drill rod. For example, the internal thread 31 on the drill rod nut 3 can be set at the front of the drill rod nut 3 and an external nut can be designed on the outer circle of the rear of the drill rod to match it.

[0016] The direct threaded connection between the piston 1 and the drill rod 2 will produce many beneficial effects. First, it avoids direct collision between the piston 1 and the drill rod 2, and prolongs the service life of the piston 1 and the drill rod 2; second, due to the direct connection between the piston 1 and the drill rod 2, the hydraulic breaker no longer needs the drill rod seat (i.e., the lower cylinder of the hydraulic breaker) and the inner bushing, outer bushing, flat pin and other parts in the drill rod seat, which greatly reduces the weight of the hydraulic breaker, not only greatly reduces the cost, but also allows a smaller excavator to drive the hydraulic breaker; third, due to the direct connection between the piston 1 and the drill rod 2, the original power component for striking the target object was only the piston, but now it is changed to the piston, the drill rod and the drill rod nut, which greatly improves the striking force.

[0017] Since the travel force and return force of the hydraulic breaker are much greater than the weight of the piston and drill rod assembly, directly connecting the piston and the drill rod will not change the working state of the hydraulic breaker.

Claims

1. A hydraulic breaker piston drill rod assembly, consisting of a piston and a drill rod, characterized in that The piston is provided with a piston end thread, the drill rod is provided with a drill rod thread, and the piston and the drill rod are connected through the piston end thread and the drill rod thread.

2. A hydraulic breaker piston rod assembly according to claim 1, characterized in that The piston end thread arranged on the piston is an external thread, and the drill rod thread arranged on the drill rod is an internal thread.

3. A hydraulic breaker piston rod assembly according to claim 1, characterized in that The piston end thread arranged on the piston is an internal thread, and the drill rod thread arranged on the drill rod is an external thread.

4. A hydraulic breaker hammer piston drill rod assembly as claimed in claim 1, further comprising a drill rod nut, characterized in that The piston is provided with an external thread at the piston end, the rear of the drill rod is provided with a drill rod boss which matches with the front of the drill rod nut, the rear of the drill rod nut is provided with an internal thread of the drill rod nut which matches with the external thread at the piston end on the piston, and the piston and the drill rod are also connected through the drill rod nut.

5. A hydraulic breaker piston rod assembly as claimed in claim 4, characterized in that The external thread on the piston end of the piston is in opposite spiral directions to the external thread on the piston head.

6. A hydraulic breaker hammer piston rod assembly as claimed in claim 4, characterized in that The piston is provided with a piston disassembly groove, and the drill rod is also provided with a drill rod disassembly groove, so as to facilitate disassembly and assembly using a side hook wrench.

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