Energy storage mechanism for hydraulic rock drill

Abstract

The application discloses a kind of energy storage mechanisms for hydraulic rock drill, it includes: rock drill body and oil return pipeline, and rock drill body is equipped with energy accumulator;Oil return pipeline includes high-pressure section and low-pressure section, high-pressure section is communicated with high-pressure accumulator, and low-pressure section is communicated with low-pressure accumulator.High-pressure accumulator can temporarily accommodate the hydraulic oil extruded by impact piston rear shift during the return process of impact piston, so as to realize the energy storage function;During the stroke process of impact piston, the hydraulic oil contained in high-pressure accumulator is released to push impact piston, so as to realize the reuse of energy;Low-pressure accumulator can temporarily accommodate hydraulic oil when hydraulic pressure is large, and release it when hydraulic pressure is small, so as to realize the function of filtering high and low peak wave and stabilizing hydraulic pressure, and further solve the problem of large oil pipe jumping amplitude.

Description

Technical Field

[0001] This invention relates to the field of hydraulic rock drilling equipment technology, and in particular to an energy storage mechanism for a hydraulic rock drill. Background Technology

[0002] A hydraulic rock drill is a type of rock drilling machine that uses high-pressure oil to drive a piston to impact a drill bit, and it has an independent rotary mechanism. The hydraulic rock drill controls the reciprocating motion of the piston, causing the drill bit to repeatedly impact the rock to achieve its drilling function. Because the oil pressure is higher than the air pressure, reaching over 10 MPa, its working efficiency is higher. Although hydraulic rock drills are similar to pneumatic rock drills, they have smaller piston diameters, longer pistons, and better waveforms, resulting in faster drilling speeds, higher impact power, higher torque, and higher frequency.

[0003] Existing hydraulic rock drills do not have a dedicated energy storage mechanism. During operation, the energy of the impact piston during its return stroke cannot be stored, and the rapid reversal causes large pressure fluctuations in the hydraulic oil, resulting in reduced impact stability and oil pipe vibration. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings of the prior art and solve the problems of large hydraulic oil pressure fluctuations, low impact stability, and oil pipe jumping caused by the inability of existing hydraulic rock drills to store energy during operation.

[0005] To achieve the above objectives, the present invention discloses an energy storage mechanism for a hydraulic rock drill, comprising: a rock drill body and a return oil pipeline, wherein the rock drill body is provided with two high-pressure energy storage devices and one low-pressure energy storage device; the two high-pressure energy storage devices are located on adjacent sides of the rock drill body, and the low-pressure energy storage device is located on the opposite side of one of the high-pressure energy storage devices, and the two high-pressure energy storage devices are connected to each other through the return oil pipeline;

[0006] The return oil pipeline includes a high-pressure section and a low-pressure section. The high-pressure section is connected to the high-pressure accumulator, and the low-pressure section is connected to the low-pressure accumulator.

[0007] As a further improvement to the above technical solution:

[0008] Both the high-voltage accumulator and the low-voltage accumulator are diaphragm accumulators.

[0009] The tail section of the rock drill body is provided with a high-pressure oil port and a low-pressure oil port respectively; the inlet end of the high-pressure section is connected to the high-pressure oil port, and the outlet end of the low-pressure section is connected to the low-pressure oil port.

[0010] The high-voltage section includes a first high-voltage channel, a second high-voltage channel, a third high-voltage channel, a fourth high-voltage channel, a fifth high-voltage channel, and a sixth high-voltage channel connected in sequence, wherein the third high-voltage channel and the fourth high-voltage channel are connected by a high-voltage annular groove.

[0011] The first high-pressure channel is curved, and the inlet end of the first high-pressure channel is connected to the high-pressure oil port;

[0012] The second high-pressure channel is arranged along the axial direction of the impact piston of the rock drill body, and the inlet end of the second high-pressure channel is connected to the outlet end of the first high-pressure channel. The outlet end of the second high-pressure channel is connected to the inlet end of the buffer channel through a damping hole.

[0013] The inlet end of the third high-voltage channel is connected to the middle of the second high-voltage channel, and the outlet end of the third high-voltage channel is connected to the high-voltage annular groove.

[0014] The inlet end of the fourth high-voltage channel is connected to the high-voltage annular groove;

[0015] The inlet end of the fifth high-voltage channel is connected to the outlet end of the fourth high-voltage channel, and the outlet end of the fifth high-voltage channel is connected to the middle part of the sixth high-voltage channel;

[0016] The sixth high-voltage channel is arranged perpendicularly to the fifth high-voltage channel, and each end of the sixth high-voltage channel is connected to a high-voltage energy storage device.

[0017] An impact cylinder is formed inside the rock drill body. An impact cylinder sleeve is detachably installed inside the impact cylinder, and an impact piston is adapted to be installed inside the impact cylinder sleeve. An oil supply hole is formed on the impact cylinder sleeve, and the oil supply hole is connected to the middle of the third high-pressure channel through an oil supply pipe. Hydraulic oil can enter the inner cavity of the impact cylinder sleeve from the third high-pressure channel to push the impact piston.

[0018] The low-pressure section includes a first low-pressure channel, a second low-pressure channel, and a third low-pressure channel connected in sequence.

[0019] The first low-pressure channel and the second high-pressure channel are arranged in parallel, and the inlet end of the first low-pressure channel is connected to the return oil pipe;

[0020] The second low-pressure channel is arranged perpendicularly to the first low-pressure channel, and the inlet end of the second low-pressure channel is connected to the middle of the first low-pressure channel, and the outlet end of the second low-pressure channel is connected to the low-pressure energy storage device.

[0021] The third low-pressure channel is curved, and the inlet end of the third low-pressure channel is connected to the outlet end of the first low-pressure channel, while the outlet end of the third low-pressure channel is connected to the low-pressure oil port.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] By installing a high-pressure accumulator connected to the high-pressure section of the return oil line, the accumulator can temporarily store the hydraulic oil squeezed out by the backward movement of the impact piston during its return stroke, thus achieving energy storage. During the impact piston's stroke, the hydraulic oil stored in the high-pressure accumulator is released to push the impact piston, thereby achieving energy reuse. Furthermore, by installing a low-pressure accumulator connected to the low-pressure section of the return oil line, the accumulator can temporarily store hydraulic oil when the hydraulic pressure is high and release it when the hydraulic pressure is low, thus filtering out high and low peak fluctuations and stabilizing the hydraulic pressure, thereby solving the problem of large oil pipe fluctuations. Attached Figure Description

[0024] Figure 1 This is a partial cross-sectional schematic diagram of the energy storage mechanism for the hydraulic rock drill of the present invention;

[0025] Figure 2 for Figure 1 MM cross-sectional schematic diagram;

[0026] Figure 3 for Figure 1 A schematic diagram of the NN cross-section;

[0027] Figure 4 This is a cross-sectional schematic diagram of the rock drill body.

[0028] The labels in the diagram represent: 11, High-pressure accumulator; 12, Low-pressure accumulator; 21, High-pressure oil port; 22, Low-pressure oil port; 31, First high-pressure channel; 32, Second high-pressure channel; 33, Third high-pressure channel; 34, Fourth high-pressure channel; 35, Fifth high-pressure channel; 36, Sixth high-pressure channel; 37, High-pressure annular groove; 41, First low-pressure channel; 42, Second low-pressure channel; 43, Third low-pressure channel; 51, Impact cylinder liner; 52, Impact piston; 53, Oil supply pipe. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This invention discloses an energy storage mechanism for hydraulic rock drills.

[0031] like Figures 1 to 4 As shown, the hydraulic rock drill energy storage mechanism of this embodiment includes a rock drill body and a return oil pipeline. The rock drill body is provided with two high-pressure accumulators 11 and one low-pressure accumulator 12. The two high-pressure accumulators 11 are located on adjacent sides of the rock drill body, and the low-pressure accumulator 12 is located on the opposite side of one of the high-pressure accumulators 11. The two high-pressure accumulators 11 are connected to each other through the return oil pipeline.

[0032] The return oil pipeline includes a high-pressure section and a low-pressure section. The high-pressure section is connected to the high-pressure accumulator 11, and the low-pressure section is connected to the low-pressure accumulator 12.

[0033] By installing a high-pressure accumulator 11 connected to the high-pressure section of the return oil line, the high-pressure accumulator 11 can temporarily hold the hydraulic oil squeezed out by the backward movement of the impact piston during the return stroke of the impact piston, thereby achieving the energy storage function. During the stroke of the impact piston, the hydraulic oil stored in the high-pressure accumulator 11 is released to push the impact piston, thus realizing the reuse of energy. Furthermore, by installing a low-pressure accumulator 12 connected to the low-pressure section of the return oil line, the low-pressure accumulator 12 can temporarily hold hydraulic oil when the hydraulic pressure is high and release it when the hydraulic pressure is low, thereby achieving the functions of filtering out high and low peak waves and stabilizing the hydraulic pressure, thus solving the problem of large oil pipe fluctuations.

[0034] In this embodiment, both the high-voltage accumulator 11 and the low-voltage accumulator 12 are diaphragm accumulators.

[0035] Compared to other types of accumulators, diaphragm accumulators offer advantages such as stable performance and ease of use. They typically include compensation circuitry to effectively control deviations and improve stability. Furthermore, diaphragm accumulators often employ built-in pressure generating elements and feature electronic switches, allowing for parameter settings via simple button presses, making them highly convenient to use.

[0036] In this embodiment, the tail section of the rock drill body is provided with a high-pressure oil port 21 and a low-pressure oil port 22 respectively; the inlet end of the high-pressure section is connected to the high-pressure oil port 21, and the outlet end of the low-pressure section is connected to the low-pressure oil port 22.

[0037] High-pressure port 21 is used to input high-pressure hydraulic oil from the outside to the return oil line, and low-pressure port 22 is used to discharge low-pressure hydraulic oil from the return oil line to the outside. Both are part of the hydraulic circuit of the hydraulic rock drill.

[0038] In this embodiment, the high-voltage section includes a first high-voltage channel 31, a second high-voltage channel 32, a third high-voltage channel 33, a fourth high-voltage channel 34, a fifth high-voltage channel 35, and a sixth high-voltage channel 36 connected in sequence, wherein the third high-voltage channel 33 and the fourth high-voltage channel 34 are connected by a high-voltage annular groove 37.

[0039] Because of the complex and precise internal structure of hydraulic rock drills, in order to better coordinate with each part and reduce interference, the high-pressure section is divided into different channels so that each can play its own role.

[0040] In this embodiment, the first high-pressure channel 31 is curved, and the inlet end of the first high-pressure channel 31 is connected to the high-pressure oil port 21.

[0041] The second high-pressure channel 32 is arranged along the axial direction of the impact piston of the rock drill body, and the inlet end of the second high-pressure channel 32 is connected to the outlet end of the first high-pressure channel 31. The outlet end of the second high-pressure channel 32 is connected to the inlet end of the buffer channel through a damping hole.

[0042] The inlet end of the third high-voltage channel 33 is connected to the middle of the second high-voltage channel 32, and the outlet end of the third high-voltage channel 33 is connected to the high-voltage annular groove 37.

[0043] The inlet end of the fourth high-voltage channel 34 is connected to the high-voltage annular groove 37;

[0044] The inlet end of the fifth high-voltage channel 35 is connected to the outlet end of the fourth high-voltage channel 34, and the outlet end of the fifth high-voltage channel 35 is connected to the middle of the sixth high-voltage channel 36.

[0045] The sixth high-voltage channel 36 is arranged perpendicularly to the fifth high-voltage channel 35, and each end of the sixth high-voltage channel 36 is connected to a high-voltage accumulator 11.

[0046] Each high-pressure channel is set up according to the internal structure of the hydraulic rock drill, with optimized layout and reasonable use of the internal space of the hydraulic rock drill.

[0047] In this embodiment, an impact cylinder is formed inside the rock drill body, and an impact cylinder sleeve 51 is detachably installed inside the impact cylinder. An impact piston 52 is adapted to be installed inside the impact cylinder sleeve 51. An oil supply hole is formed on the impact cylinder sleeve 51, and the oil supply hole is connected to the middle of the third high-pressure channel 33 through the oil supply pipe 53. Hydraulic oil can enter the inner cavity of the impact cylinder sleeve 51 from the third high-pressure channel 33 to push the impact piston 52.

[0048] Because the impact piston 52 will repeatedly rub against the cavity wall during operation, it may cause damage to the cavity wall. In order to extend the service life of the hydraulic rock drill and reduce the operating cost, a removable impact cylinder liner 51 is provided inside the impact cylinder. In order to deliver hydraulic oil into the inner cavity to drive the impact piston 52, an oil supply pipe 53 connected to the third high-pressure channel 33 is provided.

[0049] In this embodiment, the low-voltage section includes a first low-voltage channel 41, a second low-voltage channel 42, and a third low-voltage channel 43 connected in sequence.

[0050] Because of the complex and precise internal structure of hydraulic rock drills, in order to better coordinate with each part and reduce interference, the high-pressure section is divided into different channels so that each can play its own role.

[0051] In this embodiment, the first low-pressure channel 41 and the second high-pressure channel 32 are arranged in parallel, and the inlet end of the first low-pressure channel 41 is connected to the return oil pipe.

[0052] The second low-pressure channel 42 is arranged perpendicularly to the first low-pressure channel 41, and the inlet end of the second low-pressure channel 42 is connected to the middle of the first low-pressure channel 41, and the outlet end of the second low-pressure channel 42 is connected to the low-pressure accumulator 12.

[0053] The third low-pressure channel 43 is curved, and its inlet end is connected to the outlet end of the first low-pressure channel 41. The outlet end of the third low-pressure channel 43 is connected to the low-pressure oil port 22.

[0054] Each low-pressure channel is set up according to the internal structure of the hydraulic rock drill, with optimized layout and reasonable use of the internal space of the hydraulic rock drill.

[0055] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. An energy storage mechanism for a hydraulic rock drill, comprising a rock drill body and a return oil line, characterized in that, Two high-pressure accumulators (11) and one low-pressure accumulator (12) are arranged on the rock drill body respectively; the two high-pressure accumulators (11) are located on the adjacent sides of the rock drill body, and the low-pressure accumulator (12) is located on the opposite side of one of the high-pressure accumulators (11); the two high-pressure accumulators (11) are communicated through the oil return pipeline; The oil return pipeline comprises a high-pressure section and a low-pressure section; the high-pressure section is communicated with the high-pressure accumulator (11), and the low-pressure section is communicated with the low-pressure accumulator (12); the high-pressure accumulator (11) and the low-pressure accumulator (12) are diaphragm accumulators; the tail of the rock drill body is respectively provided with a high-pressure oil port (21) and a low-pressure oil port (22); the inlet end of the high-pressure section is connected with the high-pressure oil port (21), and the outlet end of the low-pressure section is connected with the low-pressure oil port (22); the high-pressure section comprises a first high-pressure channel (31), a second high-pressure channel (32), a third high-pressure channel (33), a fourth high-pressure channel (34), a fifth high-pressure channel (35) and a sixth high-pressure channel (36) which are sequentially connected; the third high-pressure channel (33) and the fourth high-pressure channel (34) are communicated through a high-pressure annular groove (37); the first high-pressure channel (31) is in a curved shape, and the inlet end of the first high-pressure channel (31) is connected with the high-pressure oil port (21); The second high-pressure channel (32) is arranged along the axial direction of the impact piston (52) of the rock drill body, and the inlet end of the second high-pressure channel (32) is connected with the outlet end of the first high-pressure channel (31); the outlet end of the second high-pressure channel (32) is connected with the inlet end of the buffer channel through a damping hole; The inlet end of the third high-pressure channel (33) is communicated with the middle part of the second high-pressure channel (32), and the outlet end of the third high-pressure channel (33) is connected with the high-pressure annular groove (37); The inlet end of the fourth high-pressure channel (34) is connected with the high-pressure annular groove (37); The inlet end of the fifth high-pressure channel (35) is connected with the outlet end of the fourth high-pressure channel (34), and the outlet end of the fifth high-pressure channel (35) is communicated with the middle part of the sixth high-pressure channel (36); The sixth high-pressure channel (36) is vertically arranged with the fifth high-pressure channel (35), and the end of the sixth high-pressure channel (36) is connected with one of the high-pressure accumulators (11).

2. The energy storage mechanism for a hydraulic rock drill according to claim 1, characterized in that An impact cylinder is formed in the rock drill body, an impact cylinder sleeve (51) is detachably mounted in the impact cylinder, and an impact piston (52) is adaptively mounted in the impact cylinder sleeve (51); an oil supply hole is formed in the impact cylinder sleeve (51), the oil supply hole is communicated with the middle part of the third high-pressure channel (33) through an oil supply pipe (53), and hydraulic oil can enter the inner cavity of the impact cylinder sleeve (51) from the third high-pressure channel (33) to push the impact piston (52).

3. The energy storage mechanism for a hydraulic rock drill according to claim 1 or 2, characterized in that The low-pressure section comprises a first low-pressure channel (41), a second low-pressure channel (42) and a third low-pressure channel (43) which are sequentially connected.

4. The energy storage mechanism for a hydraulic rock drill according to claim 3, characterized in that The first low-pressure passage (41) is arranged in parallel with the second high-pressure passage (32), and the inlet end of the first low-pressure passage (41) is communicated with the oil return pipe; The second low-pressure passage (42) is arranged perpendicularly to the first low-pressure passage (41), and the inlet end of the second low-pressure passage (42) is communicated with the middle part of the first low-pressure passage (41), and the outlet end of the second low-pressure passage (42) is connected with the low-pressure accumulator (12); The third low-pressure passage (43) is in a curved shape, the inlet end of the third low-pressure passage (43) is connected with the outlet end of the first low-pressure passage (41), and the outlet end of the third low-pressure passage (43) is connected with the low-pressure oil port (22).

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