CN209892104U - Dynamic pressure feedback pilot control hydraulic shock oscillator - Google Patents

Abstract

The utility model discloses a dynamic pressure feedback pilot control surge impact oscillator, it is as the pilot stage for adopting the jet element, and the jet element forms second grade combination control with the switching-over valve to water under high pressure or high-pressure oil carry hydraulic pressure can drive piston high frequency reciprocating motion's shock oscillation device. The total flow is dynamically distributed to the fluidic element and the reversing valve after being input, the flow provided for the fluidic element only needs to meet the requirement of driving the main valve core to reverse, and most of the flow is controlled by the reversing valve and is provided for the impact mechanism. In addition, the device adopts the water hammer pressure signal of an internal feedback mechanism to control the switching of the wall-attached jet flow, so as to push the main valve core to change the direction, realize the high-frequency reciprocating motion of the piston of the impact mechanism under the working condition of large flow and generate the action of high-energy impact oscillation. The device can be used as a core component, is widely applied to a rotary percussion drilling tool system for drilling deep well hard rock, and can also be used for constructing a hydraulic breaking hammer, a top drive type hydraulic pile hammer or a pipe ramming hammer and a hydraulic vibration test bed.

Description

Dynamic pressure feedback pilot control hydraulic shock oscillator

Technical Field

The utility model relates to a hydraulic shock and vibrating device especially relate to a dynamic pressure feedback pilot control surge impact oscillator.

Background

The proposal of the hydraulic jet impactor can be traced back to the Chinese utility model patent CN2040529 in 1989 for the first time, which discloses a hydraulic impact vibration device adopting a bistable wall-attached jet element to directly drive a piston to do work. In the use process of the hydraulic jet impactor, the problems that a jet element is easy to erode and damage, the flow supply of an upper cavity of an inner cylinder is insufficient when a piston moves at a high speed, the abrasion resistance of the piston and a piston rod is poor and the like occur. In order to improve the working performance of the hydraulic jet impactor, an innovative scheme aiming at the structure of the hydraulic jet impactor is continuously provided, a representative hydraulic jet impactor is disclosed in Chinese patent documents, the detailed description is in publication number CN102454360, and a structure that a disc spring and a seat are additionally arranged above a jet element is provided; the Chinese patent document discloses a jet-type hydraulic percussion drill for horizontal directional drilling, which is detailed in publication No. CN106894757A, and proposes a surface hardening process for constructing a split-type jet element by using a hard alloy material and plating phosphorus and nickel by using a piston and a cylinder, and measures for reducing friction and improving wear resistance by embedding polytetrafluoroethylene plastics on a hammer; the chinese patent document discloses a jet-type hydraulic hammer with a flow-compensating energy-storing function, which is published with CN207131329U, and proposes a flow-compensating scheme for an upper cavity of an inner cylinder using return energy-storing and throttling buffering, and so on. Although the hydraulic jet impactor directly controlled by the bistable jet element is improved and optimized for many times, the problems that the element is easy to erode, the service life is short, the effective working pressure difference of the impactor is small, the flow of the upper cavity of the inner cylinder during the stroke cannot meet the requirement of high-speed motion of the piston and the impact hammer and the like are still difficult to fundamentally solved. In fact, the fundamental reasons for the above difficulties are: the jet flow element is adopted to directly control the impact mechanism, and the limitations of the structure and the performance of the jet flow element cannot be broken through. The bistable wall-attached jet element works according to the coanda principle, has a narrow input channel and adopts an open working cavity inside, so that in the face of the working requirements of the drilling industry that water and mud are used as working media and the flow rate is high, a hydraulic jet impactor directly controlled by the jet element has insurmountable technical bottlenecks in principle, such as extremely high throttling loss caused by too small overflowing area of an element inlet, large volatility and stability caused by the influence of load on wall-attached jet, and the like; in addition, for the application of the jet element in the technical field of hydraulic vibration of engineering machinery, although the jet element has a non-moving part and adopts the characteristic of pressure feedback control, the maximum working pressure is not high, and the jet element cannot obtain high impact energy when being directly used for driving an impact mechanism, so that the practical value is lost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem that exists among the prior art, provide a dynamic pressure feedback pilot control surge impact oscillator, adopt bistable attaches wall fluidic element and makes the pilot stage control switching-over valve, the switching-over valve is as the main valve, passes through the flow distribution pore by the large-traffic liquid of switching-over valve control high pressure, and then the drive surge impact mechanism action that surges.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the dynamic pressure feedback pilot control hydraulic impact oscillator is characterized in that a hydraulic impact oscillation device adopting dynamic pressure feedback two-stage control is adopted, a jet flow element is used as a pilot valve, a reversing valve is used as a main valve, the jet flow element and the reversing valve are sequentially arranged above a hydraulic impact mechanism from top to bottom along the axial direction of an outer pipe of the hydraulic impact oscillator, and the jet flow element is used for driving the reversing valve to reverse; the reversing valve has two working positions of high pass and low pass, when the reversing valve is at the high pass position, the upper cavity of the inner cylinder of the hydraulic impact mechanism is communicated with high pressure, and the piston and a punch hammer arranged at the lower end of the piston perform differential stroke action; when the reversing valve is in a low-pass position, an upper cavity of an inner cylinder of the hydraulic impact mechanism is communicated with low pressure, and the piston and a punch hammer arranged at the lower end of the piston perform return motion; a flow dividing valve is arranged above the jet flow element, the inlet end of the flow element is communicated with the liquid outlet end of the reversing valve, the flow dividing valve comprises a flow dividing valve body, a pressure regulating spring, a flow dividing valve core, a flow dividing valve sleeve and a flow dividing valve seat, the flow dividing valve seat is fixed at the lower end of the flow dividing valve sleeve, and a spring cavity of the flow dividing valve sleeve is communicated with an oil return flow distributing pore channel arranged on the flow dividing valve seat through a radial pressure relief hole; the upper part of the shunt valve body is provided with a cushion pad, a hollow channel of the shunt valve core is communicated with a high-pressure inlet of the shunt valve, a pressure regulating spring is tightly pressed on an annular working surface of a shoulder on the upper part of the shunt valve core, an annular chamber on the upper part of a shunt valve sleeve where the pressure regulating spring is positioned is communicated with low pressure, the lower end surface of the shunt valve core is tightly pressed on a shunt valve seat under the spring force action of the pressure regulating spring in an initial state, the shunt valve core is provided with a radial shunt hole, the shunt valve sleeve is provided with a through-; the top end of the outer pipe is connected with a drill rod joint, the lower end of the drill rod joint abuts against the buffer pad, and an inner hole of the drill rod joint is used for realizing external connection and receiving high-pressure fluid;

the jet element is a bistable wall-attached planar element and is arranged in the pilot valve sleeve, the flow distribution sleeve is arranged below the jet element, the center of the flow distribution sleeve is provided with a stepped through hole, the flow distribution sleeve is spliced with the upper core tube, the upper core tube is of a stepped cylindrical structure, the upper core tube is spliced with the lower core tube, and the upper core tube is internally provided with a feedback signal receiving pore channel;

the main valve core of the reversing valve is of a step-type hollow cylindrical sliding valve structure, the reversing valve is installed in a main valve sleeve, main liquid flow pore passages with one-to-one correspondence positions and consistent structures are arranged on the contact surface of the main valve sleeve and a flow distribution sleeve, and the main valve sleeve is also provided with a feedback signal passage for receiving water hammer pressure of upper and lower cavities of an inner cylinder of the hydraulic impact mechanism;

the hydraulic impact mechanism comprises a piston, an inner cylinder of the hydraulic impact mechanism and a lower core tube, wherein a convex shoulder of the piston divides the inner cylinder of the hydraulic impact mechanism into an upper cavity and a lower cavity, the inner cylinder of the hydraulic impact mechanism adopts a stepped hole structure, the upper end of the stepped hole utilizes an outer shoulder of the lower core tube as an upper cylinder cover, the lower part of the stepped hole is used for sealing the rod outlet end of the piston, and a feedback signal input pore channel is formed in the piston.

The jet flow element is of an integral plane structure, and the output pore canal of the jet flow element is arranged in the width direction of the jet flow element and is symmetrical about the middle plane of the element vertical to the working plane; the pressure feedback signal channel of the fluidic element is arranged in its thickness direction symmetrically with respect to the axis of the hydraulic impact mechanism.

The reversing valve is a double-shoulder sliding valve, a sinking groove is formed in the middle of a main valve core of the reversing valve, a pressure switching pore channel is arranged in the sinking groove, the reversing valve has two working positions of high pass and low pass, when the reversing valve is in the high pass position, the shoulder in the main valve sleeve corresponds to the middle of the sinking groove in the main valve core, the flow distribution channels communicated with the upper cavity and the lower cavity of an inner cylinder of the hydraulic impact mechanism in the main valve sleeve are communicated with high-pressure liquid flow, and the piston and a hammer arranged at the lower end of the piston perform differential stroke action; when the reversing valve is in a low-pass position, the internal shoulder of the main valve sleeve and the corresponding shoulder on the main valve core form clearance fit, meanwhile, a pressure switching pore passage in a main valve core sink groove is communicated with a low-pressure emptying channel of an upper core pipe, an upper cavity of an inner cylinder of the hydraulic impact mechanism is communicated with low pressure through a flow distribution channel in the main valve sleeve, a lower cavity of the inner cylinder of the hydraulic impact mechanism keeps high pressure, a piston and a punching hammer arranged at the lower end of the piston perform return stroke action, pilot control cavities at two sides of the main valve core are communicated with an output pore passage of a jet element, and the pilot control cavities and a main flow passage of the jet element are sealed by the shoulders.

A damping channel is formed in the main valve core.

Through the above design scheme, the utility model discloses following beneficial effect can be brought: the utility model provides a dynamic pressure feedback pilot control surge impact oscillator is the oscillating system who adopts bistable wall-attached fluidic element and switching-over valve joint control impact mechanism. The technical advantages are as follows:

(1) the dynamic pressure feedback control can ensure the return stroke after the impact is finished, the impact energy of the impact mechanism can be utilized to the maximum extent, and the reversing control signal is taken from the water hammer pressure peak value caused by mechanical collision, so that the mechanical energy loss caused by the deceleration of the impact mechanism working by adopting the position feedback principle at the stroke close to the end point due to the reverse pressure difference is effectively avoided.

(2) The bistable wall-attached jet element is used as a pilot control stage, and a feedback signal is directly taken from a hydraulic impact mechanism, so that reliable self-excited vibration control can be realized. Aiming at the characteristics that the channel of the bistable wall-attached type jet element is narrow and the internal flow field has an open structure, the pressure-limiting type flow divider valve is arranged at the inlet of the bistable wall-attached type jet element, thereby realizing reasonable flow distribution between the jet element and the reversing valve and effectively avoiding the defects of easy erosion and large throttling loss of the jet element under the condition that the jet element is used for directly driving the impact mechanism.

(3) The lower cavity of the inner cylinder of the hydraulic impact mechanism is normally open to high pressure, and is movably connected during stroke, the upper cavity of the inner cylinder of the hydraulic impact mechanism is connected with low pressure through a reversing valve with three-way control function during return stroke, a main valve core of the reversing valve has a hollow structure, and a low pressure channel is arranged on the inner side. The damping channel on the main valve core ensures the stability of the wall attachment state of the jet flow, and simultaneously, the main valve core effectively overcomes the steady-state and transient hydraulic power, can be quickly, stably and reliably reversed and can accurately stop at the working position.

(4) The hydraulic impact mechanism is characterized in that a feedback signal receiving pore passage is arranged in the upper core pipe, a feedback signal input pore passage is formed in the piston, the feedback signal input pore passage in the piston is communicated with the feedback signal receiving pore passage of the upper core pipe only when the piston moves to the vicinity of a stroke or return stroke end point, the influence of main liquid flow in a cylinder of the hydraulic impact mechanism on the wall attachment state of the jet element is effectively avoided, and the hydraulic impact mechanism can normally work under the condition of extremely high back pressure as a deep well hydraulic rotary-percussion drilling tool.

(5) The bistable wall jet flow element adopts an integral planar element structure, and only needs to be inserted into the rectangular mounting hole of the pilot valve sleeve during assembly, so that the operation is convenient, and the bistable wall jet flow element is easy to replace when damaged. The bistable wall-attached jet element is formed in one step by adopting a powder metallurgy die-casting mode, has high processing efficiency and low cost, and is beneficial to batch production.

(6) The dynamic pressure feedback pilot control hydraulic shock oscillator comprises three main components: firstly, the jet flow element is used as a pilot control; a reversing valve; and hydraulic impact mechanism. The components can be connected by adopting compact auxiliary flow distribution parts, are assembled in the outer pipe body and are used as a hydraulic impactor and an oscillator for deep well hard rock drilling; or the independent shells can be arranged in a split way and connected by a pipeline to form a high-power hydraulic impact device applied to the earth surface; the hydraulic hammer shear can be assembled in an integrated mode, auxiliary elements such as an energy accumulator are additionally arranged, a dynamic pressure feedback type hydraulic hammer shear is constructed, a hydraulic vibration test bed is built as a core component, and the hydraulic hammer shear is quite wide in application field.

Drawings

Fig. 1 is a general diagram of a system structure of a dynamic pressure feedback pilot control hydraulic shock oscillator in an embodiment of the present invention.

Fig. 2 is a schematic structural view of a reversing valve in an embodiment of the present invention.

Fig. 3 is a schematic diagram of an embodiment of the present invention illustrating a bistable wall-attached fluidic element and a control flow distribution structure.

Fig. 4 is a schematic structural view of a hydraulic impact mechanism in an embodiment of the present invention.

Fig. 5 is a schematic diagram of the feedback signal path structure of the hydraulic impact mechanism in the embodiment of the present invention.

Fig. 6 is a schematic diagram of a system for controlling a hydraulic shock oscillator by dynamic pressure feedback pilot control according to an embodiment of the present invention.

The respective symbols in the figure are as follows: 1-a drill pipe joint; 2-a buffer pad; 3-a diverter valve body; 4-a pressure regulating spring; 5-a shunt valve core; 6-a shunt valve sleeve; 7-a diverter valve seat; 8-a fluidic element; 9-a pilot valve sleeve; 10-a flow distribution sleeve; 11-feeding a core pipe; 12-a diverter valve; 13-main valve sleeve; 14-lower core tube; 15-hydraulic impact mechanism inner cylinder; 16-a piston; 18-a hammer punch; 19-flat bond; 20-an outer tube; 21-an anvil; 22-an anvil; 23-coupling bolt.

Detailed Description

In order to explain the present invention more clearly, the present invention will be further described with reference to the preferred embodiments and the accompanying drawings. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the dynamic pressure feedback pilot control hydraulic impact oscillator provided by the present invention adopts the bistable wall-attached fluidic element 8 as the pilot valve, the reversing valve 12 as the main valve, and the reversing valve 12 controls the high-pressure large-flow liquid to pass through the flow distribution channel, so as to drive the hydraulic impact mechanism to act. The constructed two-stage control hydraulic impact system has the following main technical characteristics:

(1) the flow input at the inlet of the impactor is dynamically distributed to the high-pressure inlets of the jet element 8 and the reversing valve 12 by adopting a pressure-limiting type flow dividing valve;

(2) the fluidic element 8 is mainly used for controlling the switching of the reversing valve 12, and the reversing valve 12 has two stable working positions corresponding to the bistable state of the wall-attached type plane fluidic element 8;

(3) the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism is constantly high pressure, the upper cavity pressure of the inner cylinder 15 of the hydraulic impact mechanism changes along with the switching of the working position of the reversing valve 12, and when the reversing valve 12 controls the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism to be high pressure, the piston 16 and the impact hammer 18 perform differential stroke action; when the reversing valve 12 controls the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism to be communicated with low pressure, the piston 16 and the hammer 18 perform return stroke action.

The initial state of a diverter valve core 5 of the diverter valve is tightly attached to a diverter valve seat 7 under the pre-tightening force of a pressure regulating spring 4, at the moment, the input liquid flow only has a channel of an inlet of a fluidic element 8, because the inlet of the jet flow element 8 is narrow, the throttling action causes the liquid pressure in the central hole channel of the input end to rise, the liquid pressure acting on the flow dividing valve core 5 overcomes the pre-tightening force of the pressure regulating spring 4 to move upwards, then the radial flow dividing hole q1 arranged on the flow dividing valve core 5 is communicated with the through-flow ring groove c1 on the flow dividing valve sleeve 6, then a small part of the high-pressure liquid flow is used for driving the reversing valve 12 to reverse through the jet element 8, and the large part of the high-pressure liquid flow enters a high-pressure flow distribution pore channel of the shunt valve sleeve 6 and enters an annular space R which is essentially two waist-shaped grooves uniformly distributed along the circumference on the outer cylindrical surface of the shunt valve sleeve 6 and is covered by the inner hole of the outer tube 20 to form a closed high-pressure area. The high-pressure liquid flow is simultaneously supplied to the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism and the oil inlet duct of the reversing valve 12, and is used for driving the hydraulic impact mechanism to work. Rectangular grooves c2 are uniformly formed along the circumference at the lower end of the diverter valve core 5, so that when the end face of the diverter valve core 5 is attached to the diverter valve seat 7 in an initial state, the liquid pressure can still be guided to act on the annular cross section of the diverter valve core 5, and the diverter valve core 5 is ensured to lift under the action of pressure. The spring cavity of the shunt valve sleeve 6 is communicated with an oil return flow distribution pore channel Y arranged on the shunt valve seat 7 through a radial pressure relief hole Y and is finally communicated with a central low-pressure channel of the shunt valve sleeve 6, so that the condition that the shunt valve core 5 is lifted is that the pressure acting on the annular section of the shunt valve core 5 overcomes the pre-tightening force of the pressure regulating spring 4, and the pressure regulating spring 4 plays a role in setting the starting pressure of the system.

The control pilot stage adopts an integral bistable wall-attached fluidic element 8, the fluidic element 8 has an internal flow field structure which is symmetrical about a middle plane, the flow obtained by flow division enters a pre-pressure cavity Pv from a circular through hole at the upper part of the fluidic element 8, then high-speed jet flow is generated through a long and narrow rectangular nozzle, the wall is attached to one side by the jet flow according to the coanda principle, and the flow enters a main valve pilot control flow passage m or a main valve pilot control flow passage n, so that a main valve core acts, a ring groove c3 on a main valve sleeve 13 is communicated with high-pressure fluid, a radial distributing hole Ps of the main valve sleeve 13 is communicated with a ring groove c3 through an axial through hole Pp, the number of the ring groove c3, the radial distributing hole Ps and the axial through hole Pp is two groups, wherein the number of the radial distributing hole Ps and the axial through hole Pp in each. After the jet wall attachment phenomenon in the jet element 8 is generated, an output pore passage Pa of the jet element 8 is communicated with a main valve pilot control flow passage m, an output pore passage Pb of the jet element 8 is communicated with a main valve pilot control flow passage n, the jet wall attachment side has higher working pressure, the output liquid flow can push the main valve core to change direction, the non-wall attachment side receives backflow through the damping channel in the main valve core, and then the backflow enters the central low-pressure channel of the upper core pipe 11 through an emptying pore passage Tv1 or an emptying pore passage Tv 2. The switching of the jet flow attaching wall side depends on the pressure change at the position of the feedback control channel Ctrl1 and the feedback control channel Ctrl2, and under the condition that the hydraulic impact mechanism works normally, a feedback signal for promoting the switching of the jet flow attaching wall side is the water hammer pressure formed in the upper cavity or the lower cavity of the cylinder 15 in the hydraulic impact mechanism.

The reversing valve 12 as the main control stage is a double-shoulder sliding valve, a sinking groove is formed in the middle of a main valve core of the reversing valve 12, a pressure switching pore channel is formed in the sinking groove, the reversing valve 12 has two working positions of high pass and low pass, when the reversing valve 12 is in the high pass position, the inner shoulder of the main valve sleeve 13 corresponds to the middle of the sinking groove on the main valve core, high-pressure liquid flow is communicated through flow distribution channels communicated with an upper cavity and a lower cavity of an inner cylinder 15 of a hydraulic impact mechanism in the main valve sleeve 13, and differential fast forward of a piston 16 and a ram 18 is realized; when the change valve 12 is in the low-pass position, the internal shoulder of the main valve sleeve 13 forms clearance fit with the corresponding shoulder on the main valve core, and meanwhile, the pressure switching pore passage in the main valve core sink groove is communicated with the low-pressure emptying channel of the upper core pipe 11, the upper cavity of the hydraulic impact mechanism inner cylinder 15 is communicated with low pressure through the flow distribution channel in the main valve sleeve 13, and meanwhile, the lower cavity of the hydraulic impact mechanism inner cylinder 15 keeps high pressure, so that the piston 16 and the impact hammer 18 return. The pilot control cavities at two sides of the main valve core are respectively communicated with an output pore canal Pa and an output pore canal Pb of the fluidic element 8, the pilot control cavities and the main flow channel of the fluidic element 8 are sealed by shoulders at two ends of the main valve core, in order to ensure that the main valve core is in a stable working position when the fluidic element 8 is stably attached to the wall and the piston 16 normally moves, a damping channel is arranged in the main valve core annular entity, and due to the existence of the damping channel, after the fluidic element 8 drives the reversing valve 12 to switch in place, the output duct Pa and the output duct Pb of the fluidic element 8 still maintain a communication state, and a certain pressure difference is formed at two ends of the main valve core through continuous small-flow through flow, the through-flow state effectively avoids wall-attached jet flow instability caused by speed mutation of the driven main valve core at the stroke end point, at the same time, the pressure difference caused by the flow also makes the main valve core in a stable working position against the hydraulic force.

The feedback control signal of the fluidic element 8 is led from the upper cavity and the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism, because the hydraulic impact mechanism has the working characteristic of differential stroke, the upper cavity and the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism are both connected with high pressure during the stroke, the effect that the feedback signal is connected with the lower cavity and the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism is equal, after the stroke is finished, the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism generates water hammer, and the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism sends out dynamic pressure feedback signal corresponding to the stroke is finished, so that the jet flow wall attachment side switching in the fluidic element 8 is caused; at the end of the return stroke, the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism generates water hammer, and sends out a dynamic pressure feedback signal to cause the switching of the jet flow attaching wall side in the jet flow element 8 again. The jet flow enters the pilot control cavities at two ends of the main valve core through the output pore canal Pa and the output pore canal Pb after switching, the reversing of the main valve core is controlled, the piston 16 and the impact hammer 18 are further controlled to change the motion direction after the reversing of the main valve core, so that the sustainable internal feedback self-excited oscillation is formed in the system under the condition of stable high-pressure liquid flow input, and the hydraulic impact mechanism constructed based on the principle can be used as an impactor for outputting impact energy in a single direction as the differential stroke can obtain higher final impact speed. In fact, by adjusting the structural parameters and adding auxiliary elements such as a return buffer accumulator, the working parameters of the impact mechanism can be flexibly adjusted to meet the specific requirements of different application fields.

The hydraulic impact mechanism is composed of a single-rod piston 16 and a hydraulic impact mechanism inner cylinder 15, wherein the piston 16 is used as a driving part, and a flat key 19 is adopted at the lower end of the piston 16 to be provided with a hammer 18, so that the mass of a moving part is increased, and enough kinetic energy is obtained. The number of the flat keys 19 is four, and the semi-circular head of the flat key 19 is provided with an internal thread through hole e for convenient disassembly. The piston 16 has a hollow low-pressure drainage hole channel, the upper part of the hydraulic impact mechanism inner cylinder 15 is sealed by a flange of the lower core tube 14, and the upper cavity of the hydraulic impact mechanism inner cylinder 15 is also communicated with an output hole channel of the reversing valve 12 through a hole channel PA in the flange of the lower core tube 14. The lower cavity of the hydraulic impact mechanism inner cylinder 15 is constantly communicated with high-pressure liquid flow through a flow distribution groove c6 and a radial through hole PB outside the lower cavity. The feedback signal diversion groove c4 is processed outside the piston 16, the feedback signal diversion groove c4 is always communicated with the flow distribution groove c6 of the hydraulic impact mechanism inner cylinder 15, and the feedback signal holes Pf which are communicated with the flow distribution groove c6 and are uniformly distributed along the circumference of the feedback signal hole, so that the feedback signal channel of the piston 16 can be always communicated with high pressure in the movement process of the feedback signal channel. A radial feedback signal hole Pr is formed below the feedback signal diversion groove c4 and is communicated with the feedback signal diversion groove c5 in the piston 16. A stroke end feedback signal hole Pra and a stroke end feedback signal hole Prb are arranged on the outer cylindrical surface below the lower core tube 14, when the stroke of the piston 16 is ended, the feedback signal diversion groove c5 is communicated with a feedback signal channel Paa on the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism, when the return stroke is ended, the feedback signal diversion groove c5 is communicated with a feedback signal channel Pbb on the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism, and further, a water impact pressure signal in a high-pressure liquid flow can be transmitted to a feedback control channel Ctrl1 or a feedback control channel Ctrl2 of the fluidic element 8, so that the switching of the wall attaching side of the fluidic element is realized, the fluidic element 8 controls the reversing valve 12 to switch, when the stroke is ended, the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism is communicated with a low pressure after the switching of the main valve, when the return stroke is ended, the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism is communicated with a high pressure after the switching of the reversing valve, and realizing the impact oscillation effect.

The utility model discloses dynamic pressure feedback pilot control surge shock oscillator, it is the surge shock oscillation device who adopts dynamic pressure feedback secondary control, and fluidic element 8 is as the pilot stage, and switching-over valve 12 is as the master control level, and fluidic element 8 and switching-over valve 12 are arranged in the middle from last to down in proper order above the impact mechanism that surges along outer tube 20 axis, and the two combined action realizes the pressure feedback secondary pilot type control of the impact mechanism that surges; the dynamic pressure feedback pilot control hydraulic shock oscillator is provided with an input end shunt valve, the shunt valve comprises a shunt valve body 3 and a pressure regulating spring 4, the flow dividing valve comprises a flow dividing valve core 5, a flow dividing valve sleeve 6 and a flow dividing valve seat 7, wherein the flow dividing valve seat 7 is fixed at the lower end of the flow dividing valve sleeve 6 through a connecting bolt 23, a buffer cushion 2 is installed at the upper part of a flow dividing valve body 3, the flow dividing valve core 5 is provided with a hollow channel q, the hollow channel q of the flow dividing valve core 5 is communicated with a middle sink of a reversing valve 12, a pressure regulating spring 4 is pressed on an annular working surface of an upper shoulder of the flow dividing valve core 5, an upper annular chamber of the flow dividing valve sleeve 6 where the pressure regulating spring 4 is located is communicated with low pressure, the lower end face of the flow dividing valve core 5 is pressed on the flow dividing valve seat 7 under the action of spring force in an initial state, the flow dividing valve core 5 is provided with a radial flow dividing hole q. The top end of the whole outer pipe 20 is connected with a drill rod joint 1, the lower end of the drill rod joint 1 abuts against the cushion pad 2 to realize the upper end positioning of internal elements, and an inner hole of the drill rod joint 1 can be processed into structures such as standard connecting threads of an oil drill rod according to a specific application mode so as to realize external connection and receive high-pressure fluid;

wherein, the fluidic element 8 is a pilot valve in the control device, the system only provides a small flow for the control device to control the switching of the main valve, the fluidic element 8 is a bistable wall-attached type plane element and is arranged in a pilot valve sleeve 9 with a rectangular mounting hole; a flow distribution sleeve 10 is arranged below the jet element 8, a stepped through hole is formed in the center of the flow distribution sleeve 10, an upper core tube 11 is inserted into the flow distribution sleeve 10, the upper core tube 11 has a stepped cylindrical structure, and the large end of the upper core tube is arranged above the upper core tube, so that a lower core tube 14 can only be inserted from the upper side. When the fluidic element 8 is installed, the lower end surface thereof presses the elastic washer t, limiting the axial position of the upper core tube 11;

the reversing valve 12 is a second stage in the dynamic pressure feedback pilot control hydraulic impact oscillator and is also a main valve for controlling the action of the hydraulic impact mechanism, most of flow is provided for the hydraulic impact mechanism through a main valve pore passage, a main valve core of the main valve is of a step-shaped hollow cylindrical spool valve structure and is installed in a main valve sleeve 13, main valve sleeve 13 and a flow distribution sleeve 10 contact surface are provided with main liquid flow pore passages with one-to-one correspondence positions and consistent structures, the hydraulic impact mechanism further comprises a feedback signal passage for receiving hydraulic impact pressure of upper and lower cavities of a cylinder 15 in the hydraulic impact mechanism, the feedback signal is from the hydraulic impact mechanism, and the hydraulic impact mechanism is also provided with an oil return flow distribution pore passage Y which can pass through a fluidic element 8 upwards and connects a central low-pressure emptying passage with a flow distribution valve spring cavity;

the hydraulic impact mechanism comprises a piston 16, a hydraulic impact mechanism inner cylinder 15 and a lower core tube 14, wherein a convex shoulder of the piston 16 divides the hydraulic impact mechanism inner cylinder 15 into an upper cavity and a lower cavity, the hydraulic impact mechanism inner cylinder 15 adopts a stepped hole structure, the upper end of the hydraulic impact mechanism inner cylinder utilizes an outer shoulder of the lower core tube 14 as an upper cylinder cover, and the lower structure of the stepped hole is used for sealing the rod outlet end of the piston 16; for a hydraulic circuit controlled by a three-way slide valve principle, the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism is constantly connected with high pressure, and the upper cavity is respectively connected with high pressure or low pressure based on the switching process of the jet flow element 8 and the reversing valve 12, so that the differential motion of piston stroke is generated, and the wall-attached jet flow is deflected and switched under the pressure feedback action based on the water hammer principle.

The fluidic element 8 is of an integral planar structure, and a main working hole channel of the fluidic element 8 is arranged in the width direction of the fluidic element and is symmetrical about an element middle plane vertical to a working plane; the pressure feedback signal channel is arranged in the thickness direction of the jet flow element 8 and is symmetrical about the axis of the hydraulic impact mechanism; the jet flow element 8 adopts high-precision high-finish metal near-net-shape processing as an optimal production approach, such as powder metallurgy die-casting technology and the like.

The flow distribution process of the reversing valve 12 is completed by an outer cylindrical ring groove and a radial through hole T together, a main valve core of the reversing valve 12 has two stable working positions corresponding to the bistable state of the fluidic element 8, wherein, a position I is communicated with high pressure through the outer cylindrical ring groove, a position II is communicated with low pressure through the radial through hole T, the radial through hole T is communicated with a low-pressure emptying pore channel of the upper core pipe 11 when the main valve core is switched to the position II, in addition, the main valve core is made of high-strength, high-hardness, high-wear-resistance and low-density materials, and a damping hole is processed on the main valve core.

The utility model discloses dynamic pressure feedback pilot control surge shock oscillator constitutes the principle as shown in figure 6, and its main functional unit work can divide into six parts, is respectively: i-a pressure limiting and flow dividing valve assembly; II-a pilot control valve assembly; III-a master control reversing valve assembly; IV-hydraulic impact mechanism assembly; v-pressure feedback signal path; VI-high pressure accumulator. The pressure limiting and flow dividing valve I is a poppet valve, working pressure is established by throttling action from an inlet of a pilot control valve II, the flow dividing valve core 5 is lifted under the action of the pressure, most of high-pressure liquid flow can directly enter an annular high-pressure channel, and the liquid flow only generates small local pressure loss because a valve port is fully opened. The pilot control valve II is mainly composed of a planar bistable wall jet flow element 8, the jet flow element 8 can be processed by linear cutting and hard alloy and is drilled by electric spark to form an internal flow field structure and a pore passage, and can also be formed by one-step die forging by adopting a powder metallurgy die casting process. The pilot valve sleeve 9 is provided with various working channels corresponding to the channels of the fluidic element 8 one by one, and mainly comprises an output channel Pa and an output channel Pb for controlling the reversing of the main valve, a feedback control channel Ctrl1, a feedback control channel Ctrl2, an emptying channel Tv1 and an emptying channel Tv2 besides an input channel Q1, wherein the channels are symmetrically arranged about the middle plane of the element because the adopted bistable fluidic element 8 has a symmetrical structure about the middle plane. The output pore canal Pa and the output pore canal Pb of the pilot control valve are used for driving a main valve in the main control reversing valve assembly III to reverse, the main valve core has two stable working positions, one of the two stable working positions controls the differential stroke of a hydraulic impact mechanism in the hydraulic impact mechanism assembly IV, and the other two stable working positions controls the return stroke of the hydraulic impact mechanism in the hydraulic impact mechanism assembly IV. The hydraulic impact mechanism in the control hydraulic impact mechanism assembly IV is provided with a single-rod piston 16, the lower end of the piston 16 is connected with a punch hammer 18 to increase the mass of a moving part, the upper cavity and the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism are communicated with high pressure during stroke, the lower cavity of the inner cylinder 15 of the hydraulic impact mechanism keeps high pressure during return stroke, and the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism is communicated with low pressure after the switching of the main valve core, so that the differential stroke of the hydraulic impact mechanism and the return stroke action of high pressure of a rod cavity and low pressure of a rodless cavity in the hydraulic impact mechanism assembly IV can be realized at one time under the control action. The piston 16 of the hydraulic impact mechanism in the hydraulic impact mechanism assembly IV is provided with a hollow low-pressure channel, the inner hole of the piston 16 is matched with the outer cylindrical surface of the lower core tube 14, the lower core tube 14 is used as the upper cover of the inner cylinder 15 of the hydraulic impact mechanism to seal the upper end of the inner cylinder 15 of the hydraulic impact mechanism, the inner pore passage of the lower core tube 14 is communicated with the output hole of the main valve, and the high-low pressure switching of the upper cavity of the inner cylinder 15 of the hydraulic impact mechanism can be realized under the control action of. A feedback signal hole Pra at the end of stroke and a feedback signal hole Prb at the end of stroke are processed in the lower core tube 14, a feedback signal guide pore passage is processed on the surface of an inner hole and an outer circle at the large end of the piston 16, the pore passages form a complete flow field structure of a pressure feedback signal passage, the feedback signal passage is smooth at the end of stroke or return stroke of the piston 16, water hammer pressure can be transmitted to a feedback control pore passage Ctrl1 or a feedback control pore passage Ctrl2 of the fluidic element 8, and jet flow switching is controlled to be attached to the wall side, so that the main valve core is driven to switch, and the working state of the flushing impact mechanism is changed. Because the total liquid supply flow of the system is approximately constant, and the speed of the moving part of the hydraulic impact mechanism in the hydraulic impact mechanism assembly IV is dynamically changed, the energy accumulator VI added in the system can realize the functions of storing energy under the condition of low speed of the piston 16 and supplementing flow and releasing energy when the piston 16 moves at high speed, thereby greatly improving the working efficiency of the whole machine.

The pilot type dynamic pressure feedback two-stage control impact oscillator constructed based on the principle can be designed into three types of typical products according to different application fields, one of the products is a downhole hydraulic impactor and a hydraulic oscillator applied to the field of petroleum and gas deep well hard rock drilling, all functional components are required to be assembled inside an outer pipe 20 along the axial direction, a top end drill rod joint 1 and an upper drill string are connected through a standard drill rod locking joint thread V, a ground drilling pump provides high-pressure fluid Q through the upper drill string, an anvil 21 arranged in an anvil block 22 below the impactor can be directly connected with a drill bit or a downhole drill string through a short-tooth acme trapezoidal thread s1, the anvil 21 can slide in the anvil block 22 along the axial line, and a spline connection structure is arranged between the anvil block and the anvil block. After driving the hydraulic impact mechanism to do work, the high-pressure fluid Q flows into a central pore passage a through a hollow pore passage d of the impact hammer 18, radial angled uniformly-distributed through holes c and uniformly-distributed through holes b on the anvil block 22, and is discharged as drilling fluid through a drill bit water hole, so that positive-circulation well bottom power rotary-impacting drilling is realized; secondly, the top-driving type hydraulic hammer or pipe ramming hammer is applied to the field of foundation engineering construction, because the limitation of the space structure is small, all parts in the system composition can be arranged in a split mode, pipelines are adopted to connect liquid flow channels at all positions, the anvil block 22 is processed into a transition flange and is directly connected to the tops of various precast piles or steel pipe piles, and hammering drilling is achieved; the hydraulic breaking hammer is applied to the field of engineering machinery, the working characteristics of simple structure, practicality and reliability of a pressure feedback mechanism can be fully utilized, each functional component in the system is installed in an integrated mode through hydraulic oil circuit blocks, the hydraulic impact mechanism shell is designed into a cuboid, and then each distributing channel is convenient to arrange more, a diaphragm type energy accumulator is additionally arranged outside the hydraulic impact mechanism shell, working media are changed into hydraulic oil, high-pressure oil is provided by an excavator chassis hydraulic power unit or an independent hydraulic station, and the hydraulic breaking hammer is matched with the engineering machinery such as an excavator in use. Furthermore, mechanism still can be used to found fatigue test devices such as various hydraulic vibration laboratory tables, and the hydraulic shock vibrating device who designs according to aforementioned combination flow control principle also is within this patent protection scope.

The present invention relates to a plurality of contents, and the specific embodiments can not be introduced one by one in the present specification, and the present specification only explains the general layout of the whole machine system integration and the special functions of necessary dependent components. Other embodiments of the combination of components along with the construction concept mentioned in the present invention are also within the scope of protection.

Claims (4)

1. The hydrodynamic feedback pilot control hydraulic impact oscillator is characterized in that a hydrodynamic feedback two-stage control hydraulic impact oscillation device is adopted, a jet flow element (8) is used as a pilot valve, a reversing valve (12) is used as a main valve, the jet flow element (8) and the reversing valve (12) are sequentially arranged above a hydraulic impact mechanism from top to bottom along the axial direction of an outer tube (20) of the hydraulic impact oscillator, and the jet flow element (8) is used for driving the reversing valve (12) to reverse; the reversing valve (12) has two working positions of high pass and low pass, when the reversing valve (12) is at the high pass position, the upper cavity of the inner cylinder (15) of the hydraulic impact mechanism is communicated with high pressure, and the piston (16) and a hammer (18) arranged at the lower end of the piston (16) perform differential stroke action; when the reversing valve (12) is in a low-pass position, the upper cavity of the inner cylinder (15) of the hydraulic impact mechanism is communicated with low pressure, and the piston (16) and a punch hammer (18) arranged at the lower end of the piston (16) perform return motion; a flow divider is arranged above the jet flow element (8), the inlet end of the flow element (8) is communicated with the liquid outlet end of the flow divider, the flow divider comprises a flow divider valve body (3), a pressure regulating spring (4), a flow divider valve core (5), a flow divider valve sleeve (6) and a flow divider valve seat (7), the flow divider valve seat (7) is fixed at the lower end of the flow divider valve sleeve (6), and a spring cavity of the flow divider valve sleeve (6) is communicated with an oil return flow distribution pore channel arranged on the flow divider valve seat (7) through a radial pressure relief hole; the upper part of the shunt valve body (3) is provided with a cushion pad (2), a hollow channel of the shunt valve core (5) is communicated with a high-pressure inlet of a reversing valve (12), a pressure regulating spring (4) is tightly pressed on an annular working surface of an upper shoulder of the shunt valve core (5), an annular chamber at the upper part of a shunt valve sleeve (6) where the pressure regulating spring (4) is positioned is communicated with low pressure, the lower end surface of the shunt valve core (5) is tightly pressed on a shunt valve seat (7) under the spring force action of the pressure regulating spring (4) in an initial state, the shunt valve core (5) is provided with a radial shunt hole, the shunt valve sleeve (6) is provided with a through-flow ring groove, and; the top end of the outer pipe (20) is connected with a drill rod joint (1), the lower end of the drill rod joint (1) abuts against the buffer pad (2), and an inner hole of the drill rod joint (1) is used for realizing external connection and receiving high-pressure fluid;

the jet flow element (8) is a bistable wall-attached planar element and is arranged in the pilot valve sleeve (9), a flow distribution sleeve (10) is arranged below the jet flow element (8), the center of the flow distribution sleeve (10) is provided with a stepped through hole, the flow distribution sleeve (10) is spliced with an upper core tube (11), the upper core tube (11) is provided with a stepped cylindrical structure, the upper core tube (11) is spliced with a lower core tube (14), and a feedback signal receiving pore channel is arranged in the upper core tube (11);

the main valve core of the reversing valve (12) is of a step-type hollow cylindrical spool valve structure, the reversing valve (12) is installed in a main valve sleeve (13), main liquid flow pore passages with one-to-one correspondence positions and consistent structures are arranged on the contact surface of the main valve sleeve (13) and the flow distribution sleeve (10), and the main valve sleeve (13) is also provided with a feedback signal passage for receiving water impact pressures of an upper cavity and a lower cavity of a hydraulic impact mechanism inner cylinder (15);

the hydraulic impact mechanism comprises a piston (16), an inner cylinder (15) of the hydraulic impact mechanism and a lower core tube (14), wherein a shoulder of the piston (16) divides the inner cylinder (15) of the hydraulic impact mechanism into an upper cavity and a lower cavity, the inner cylinder (15) of the hydraulic impact mechanism adopts a stepped hole structure, the upper end of the stepped hole utilizes an outer shoulder of the lower core tube (14) as an upper cylinder cover, the lower structure of the stepped hole is used for sealing the rod outlet end of the piston (16), and a feedback signal input pore channel is formed in the piston (16).

2. The hydrodynamic feedback pilot-controlled hydrodynamic shock oscillator according to claim 1, characterized in that the fluidic element (8) is of unitary planar construction, the output duct of the fluidic element (8) being arranged in its width direction symmetrically with respect to the element mid-plane perpendicular to the working plane; the pressure feedback signal channel of the fluidic element (8) is arranged in its thickness direction symmetrically with respect to the axis of the hydraulic impact mechanism.

3. The dynamic pressure feedback pilot control hydraulic shock oscillator as recited in claim 2, characterized in that the directional control valve (12) is a spool valve with two shoulders, a sunken groove is opened in the middle of the main valve core of the directional control valve (12), a pressure switching pore passage is provided in the sunken groove, the directional control valve (12) has two working positions of high pass and low pass, when the directional control valve (12) is in the high pass position, the inner shoulder of the main valve sleeve (13) corresponds to the middle of the sunken groove on the main valve core, the flow distribution channels in the main valve sleeve (13) which connect the upper chamber and the lower chamber of the hydraulic shock mechanism inner cylinder (15) are both connected with high pressure liquid flow, the piston (16) and the hammer (18) provided at the lower end of the piston (16) perform differential stroke action; when the reversing valve (12) is in a low-pass position, an internal shoulder of the main valve sleeve (13) is in clearance fit with a corresponding shoulder on the main valve core, meanwhile, a pressure switching pore passage in a main valve core sink groove is communicated with a low-pressure emptying channel of the upper core pipe (11), an upper cavity of the hydraulic impact mechanism inner cylinder (15) is communicated with low pressure through a flow distribution channel in the main valve sleeve (13), a lower cavity of the hydraulic impact mechanism inner cylinder (15) keeps high pressure, a piston (16) and a punch hammer (18) arranged at the lower end of the piston (16) perform return motion, pilot control cavities at two sides of the main valve core are communicated with an output pore passage of the jet flow element (8), and the pilot control cavities and a main flow passage of the jet flow element (8) are sealed by shoulders at two ends of the main valve.

4. The dynamic pressure feedback pilot-controlled hydraulic shock oscillator as claimed in claim 3, wherein the main spool is provided with a damping channel therein.

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