WO2020093618A1

WO2020093618A1 - Hydraulic linear impact vibration pile hammer machine

Info

Publication number: WO2020093618A1
Application number: PCT/CN2019/075111
Authority: WO
Inventors: 寇子明; 李超宇; 许步勤; 陆春月; 任启超; 杨鑫科
Original assignee: 太原理工大学
Priority date: 2018-11-07
Filing date: 2019-02-14
Publication date: 2020-05-14
Also published as: AU2019377666B2; CN109594561A; CN109594561B; AU2019377666A1

Abstract

Provided is a hydraulic linear impact vibration pile hammer machine, comprising an impact vibration seat (11), a hydraulic cylinder (12) for applying impact and vibration to the impact vibration seat (11), a hydraulic station (13) for driving the hydraulic cylinder and a reversing mechanism for changing the direction of hydraulic oil entering the hydraulic cylinder (12) according to a preset frequency; the hydraulic cylinder (12) comprises a cylinder body (121) and a piston rod (122), wherein, the cylinder body (121) is directly or indirectly fixed to the impact vibration seat (11), and an impact hammer (15) is fixed to the piston rod (122).

Description

Hydraulic linear impact vibration pile hammer machine

Cross-reference of related applications

This application is based on a Chinese patent application with an application number of 201811321606.X and an application date of November 7, 2018, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference.

Technical field

The invention relates to the technology of foundation pile construction machinery for construction engineering and engineering equipment, in particular to a hydraulic linear impact vibration pile hammer machine.

Background technique

Pile foundation construction is often required in the fields of construction machinery, offshore engineering equipment, offshore wind power, and cross-sea bridges. The construction of pile foundation relies on equipment such as pile hammer machine.

The current pile hammer machine has the problems of slow pile driving speed and high energy consumption. For example, the invention patent with publication number CN108252304A and titled "Electric Impact Piling Hammer" includes an operation console, a control cabinet, a power supply and a hammer body. This invention drives the winch drum through a frequency conversion motor to raise the hammer core. Quick release at height, free fall of hammer core impacts pile driving, realizing the conversion of electrical energy from grid into pile driving potential energy. The device uses electric power as the power, but the structure is still a traditional impact hammer, relying on the impact force for pile driving, the energy loss is relatively large, the speed is slow, and the mechanical efficiency is relatively low.

Summary of the invention

In view of this, the present invention desires to provide a hydraulic linear impact vibratory pile hammer machine with high speed and high mechanical efficiency.

To achieve the above objective, the technical solution of the present invention is implemented as follows:

An embodiment of the present invention provides a hydraulic linear impact vibration pile hammer machine, which includes an impact vibration base, a hydraulic cylinder that applies impact and vibration to the impact vibration base, a hydraulic station driving the hydraulic cylinder, and preset A reversing mechanism whose frequency changes the direction of the hydraulic oil entering the hydraulic cylinder;

The hydraulic cylinder includes a cylinder body and a piston rod, the cylinder body is directly or indirectly fixed to the impact vibration seat, the piston rod is fixed with an impact hammer; the impact hammer An impact vibration seat applies an impact, and the cylinder body vibrates the impact vibration seat when the piston rod moves.

In the above solution, the piston rod is disposed above the hydraulic cylinder, and the moving direction is vertical; the bottom end of the cylinder body is fixed to the top end of the impact vibration base; the impact hammer includes a fixing portion and An impact part, the fixing part is fixed to the piston rod, the impact part extends from above the cylinder body along the periphery of the cylinder body to the impact vibration seat; when the piston rod moves, the impact hammer is driven Movement and apply an impact to the impact vibration base.

In the above solution, the pile hammer machine is further provided with an impact strengthening mechanism, which includes an elastic member provided on the impact vibration base; when the impact hammer is moved upward by the piston rod, the The elastic member is compressed and stored energy; when the impact hammer is driven downward by the piston rod, the elastic force of the elastic member pushes the impact hammer downward.

In the above solution, the reversing mechanism includes a valve body with an inner cavity sealed and a spool that can be rotated at one end of the valve body; the valve body is provided with a first working port connected to the hydraulic cylinder And a second working oil port, the spool is provided with an oil inlet line and an oil return line connecting the hydraulic station; the oil inlet line includes at least one that can communicate with the first working oil port or the second working port An oil outlet of the oil port, the oil return line includes at least one oil inlet that can communicate with the second working oil port or the first working oil port;

The valve core is preset with at least two working positions uniformly distributed in the circumference within a rotating circle; when the valve core rotates to the first working position, the oil outlet communicates with the second working oil port, The oil inlet communicates with the first working oil port; when the spool rotates to the second working position, the oil outlet communicates with the first working oil port, and the oil inlet communicates with the second Working port; wherein, the first working position and the second working position are working positions adjacent in the circumferential direction of the valve core.

In the above solution, the first working oil port and the second working oil port are both opened on the outer circumference of the valve body and are axially aligned; the outer circumference of the valve core is provided with two surrounding the entire valve core The circumferential and radial positions respectively correspond to the connection areas of the first working oil port and the second working oil port, and each of the connection areas is provided with alternately arranged oil outlets and oil inlets For a circle of oil ports, the two oil ports in the connection area are aligned in the axial direction, and the two types of oil ports aligned in the axial direction are different.

In the above solution, an annular groove surrounding the entire outer surface of the valve core is opened on the outer circular surface of the valve core between the two connecting areas, and the oil outlet is provided in the connecting area and the annular groove shaft A U-shaped groove communicating with each other; the valve core is also provided with a central hole that extends axially and has an axis consistent with the axis of the valve core, and the oil inlet is the first opening in the connecting area that communicates with the central aperture Through hole; the U-shaped groove and the central hole are not in radial communication, and the first through hole and the annular groove are not in axial communication;

The oil inlet pipeline starts from the annular groove and flows into the first working oil port or the second working oil port after passing through the U-shaped groove; the oil return pipeline is from the The first working oil port or the second working oil port, after passing through the first through hole and the central hole, flows to the hydraulic station to return oil; the valve body is also provided with a connection to the hydraulic A first connecting oil port of the station and the annular groove and a second connecting oil port connecting the hydraulic station and the center hole, the valve core is provided with a second connecting oil port to cooperate with the center The second through hole communicating with the hole.

In the above solution, the valve core is further provided with two annular grooves at both ends of the inner cavity of the valve body, one of the two annular grooves is provided with the second through hole, and the other is provided with The third through hole communicating with the center hole.

In the above solution, the reversing mechanism further includes a motor that drives the spool to rotate, one end of the spool is located in the cavity of the valve body, and the other end of the spool passes through the valve body and the The output shaft of the motor is connected; the motor is a variable frequency motor.

In the above solution, the valve body is further provided with a valve core sleeve, and the valve core sleeve is provided with an accommodating space which is open at both ends; At the connection between the two ends of the valve core and the valve core sleeve is provided with a sealing structure; the outer wall of the valve core sleeve is fixed in the inner cavity of the valve body.

In the above solution, the seal structure is a labyrinth seal structure.

The hydraulic linear impact vibration pile hammer machine of the embodiment of the present invention, an impact vibration base, a hydraulic cylinder that applies impact and vibration to the impact vibration base, a hydraulic station driving the hydraulic cylinder, and changing into the hydraulic cylinder at a preset frequency Reversing mechanism of the direction of the hydraulic oil; the cylinder is directly or indirectly fixed to the shock vibration seat, the piston rod is fixed with an impact hammer; the impact hammer impacts the impact when the piston rod moves The vibration base applies an impact, and the cylinder body vibrates the impact vibration base when the piston rod moves; it can be seen that the hydraulic linear impact vibration pile hammer machine of the embodiment of the present invention vibrates the impact through the impact hammer and the cylinder body The seat exerts shock and vibration, and the vibration and shock are coupled to produce a larger pile sinking force, with a fast pile driving speed and high mechanical efficiency.

Other beneficial effects of the embodiments of the present invention will be further described in the specific implementation in combination with specific technical solutions.

BRIEF DESCRIPTION

1 is a schematic diagram of a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention;

2 is a schematic diagram of an impact vibration base and a hydraulic cylinder in a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention after being assembled;

3 is a schematic diagram of a hydraulic cylinder in a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention;

4 is a schematic diagram of the assembled valve body and valve core in the hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention;

5 is a schematic diagram of a valve body in a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention;

6 is a schematic diagram of a valve core in a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention;

7 is a schematic cross-sectional view taken along line C-C in FIG. 6;

8 is a schematic view of a valve core sleeve in a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention.

detailed description

It should be noted that, in the description of the embodiments of the present invention, unless otherwise stated and limited, the term "connection" should be understood in a broad sense, for example, it may be an electrical connection, or it may be a connection between two elements, or may be directly connected It can also be indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meaning of the above terms can be understood according to specific circumstances.

It should be noted that if the term "first \ second \ third" involved in the embodiment of the present invention is only to distinguish similar objects, it does not mean a specific order for the objects. Understandably, "first \ third" "Two \ Third" can allow a specific order or sequence to be exchanged if allowed. It should be understood that the objects distinguished by "first \ second \ third" may be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

The hydraulic linear impact vibration pile hammer machine provided by the embodiment of the present invention, the pile hammer machine may include an impact vibration base, a hydraulic cylinder that applies impact and vibration to the impact vibration base, a hydraulic station driving the hydraulic cylinder, and a pre-press A reversing mechanism is provided for changing the direction of the hydraulic oil entering the hydraulic cylinder; the hydraulic cylinder includes a cylinder body and a piston rod, the cylinder body is directly or indirectly fixed to the impact vibration seat, and the piston rod is fixed There is an impact hammer; the impact hammer applies an impact to the impact vibration base when the piston rod moves, and the cylinder applies vibration to the impact vibration base when the piston rod moves. The impact hammer exerts an impact on the impact vibration base when the piston rod moves, which means that the impact hammer directly hits the impact vibration base under the impact of hydraulic power; the cylinder block is opposed when the piston rod moves The impact vibration base applies vibration, which means that the cylinder will vibrate under the action of hydraulic oil that continuously changes direction; here, the faster the conversion speed, the higher the vibration frequency, the greater the pile sinking force; Or indirectly fixed to the impact vibration base, so the vibration generated by the cylinder will act on the impact vibration base.

The principle of the embodiment of the present invention: the impact hammer and the cylinder body simultaneously apply impact and vibration to the impact vibration base, and the vibration and impact coupling generates greater pile sinking force, and has a fast pile driving speed and high mechanical efficiency. In addition, the motive force for the impact on the impact vibration base is a hydraulic system, and the hydraulic system starts and stops at a fast speed, so it may not resonate with other components or the resonance time is short, avoiding other components in the pile hammer machine Impact damage.

In one embodiment, the piston rod may be disposed above the hydraulic cylinder, and the movement direction is vertical; the bottom end of the cylinder body is fixed to the top end of the impact vibration base; the impact hammer It includes a fixed part and an impact part, the fixed part is fixed with the piston rod, the impact part extends from above the cylinder body along the periphery of the cylinder body to the impact vibration seat, ie the impact part is a sleeve A ring provided on the cylinder; when the piston rod moves, it drives the impact hammer to move and impacts the impact vibration base. Since the cavity of the hydraulic cylinder is divided into a rod cavity and a rodless cavity, the piston cavity with a rod cavity and a rodless cavity has different areas. In this embodiment, the piston rod is above, the piston with a rod cavity above has a small area, and the lower one has no rod cavity. The rod cavity piston has a large area; when the reversing mechanism changes direction according to the set time, the piston rod has the same upward or downward time, and regardless of the upward or downward, the oil intake of the cylinder is also equal, the pipeline The oil pressure is also equal. In this way, according to the principle of hydraulic pressure: because the area of the piston with a rod cavity above is small, the downward speed is greater, that is, the downward stroke length is greater than the upward stroke length. Each time the downward stroke, the impact hammer will hit the impact vibration Seat to apply an impact to the shock vibration seat.

In one embodiment, the pile hammer machine may also be provided with an impact strengthening mechanism, which includes an elastic member provided on the impact vibration base; the impact hammer is driven upward by the piston rod During movement, the elastic member is compressed and stored energy; when the impact hammer is driven downward by the piston rod, the elastic force of the elastic member pushes the impact hammer downward. Specifically, the elastic member may be a compression spring, so that when the impact hammer moves downward, the initial velocity of the impact hammer can be increased because the reaction speed of the rebound of the compression spring is greater than the reaction speed of the piston rod commutation, Get greater impact.

In one embodiment, the reversing mechanism may include a valve body with an internal cavity sealed and a spool that can be rotated at one end of the valve body; the valve body is provided with a first A working oil port and a second working oil port, the spool is provided with an oil inlet line and an oil return line connected to the hydraulic station; the oil inlet line includes at least one that can communicate with the first working oil port or The oil outlet of the second working oil port, the oil return line includes at least one oil inlet that can communicate with the second working oil port or the first working oil port; the valve core is on a rotating circle There are at least two working positions uniformly distributed on the circumference; when the spool rotates to the first working position, the oil outlet communicates with the second working oil port, and the oil inlet communicates with the first A working oil port; when the spool rotates to the second working position, the oil outlet communicates with the first working oil port, and the oil inlet communicates with the second working oil port; wherein, the first A working position and the second working position are adjacent to each other in the circumferential direction of the spool Location. In this way, through the cooperation of the valve body and the valve core, and driven by a power device such as a motor, the hydraulic oil entering the hydraulic cylinder can be quickly switched to ensure the working efficiency of the pile hammer machine. It can be understood that the reversing mechanism may also be an electromagnetic reversing valve, but the reversing frequency of the electromagnetic reversing valve is relatively low.

In one embodiment, both the first working port and the second working port can be opened on the outer circumference of the valve body and are axially aligned; the outer circumference of the valve core is provided with two The circumferential and radial positions around the entire valve core respectively correspond to the connection areas of the first working oil port and the second working oil port, and each of the connection areas is provided with the oil outlet and the oil inlet For a circle of oil ports arranged in the oral cavity, the oil ports in the two connection areas are aligned in the axial direction, and the types of the two oil ports aligned in the axial direction are different. In this way, the spool rotates once, and the hydraulic oil entering the hydraulic cylinder can change its direction several times to ensure a higher working efficiency of the pile hammer machine. It can be understood that it is also feasible to provide fewer oil outlets and oil inlets, for example, the first working oil port and the second working oil port are symmetrically opened on the outer circumference of the valve body, and the oil outlet It is also set correspondingly to the oil inlet. In this way, the hydraulic oil entering the hydraulic cylinder changes direction only once when the spool rotates once.

In one embodiment, the valve core may be provided with an annular groove surrounding the entire outer surface of the valve core on the outer circular surface between the two connecting areas, and the oil outlet is provided for A U-shaped groove in axial communication with the annular groove; the valve core is also provided with a central hole that extends axially and has an axis that is consistent with the axis of the valve core, and the oil inlet is defined by the central aperture A first through hole communicating; the U-shaped groove and the central hole are not in radial communication, the first through hole and the annular groove are not in axial communication; the oil inlet line is from the annular At the beginning of the groove, after passing through the U-shaped groove, it flows into the pipeline through which the first working oil port or the second working oil port passes; the oil return line is from the first working oil port or the second Starting from the working oil port, it returns to the oil return line of the hydraulic station after passing through the first through hole and the center hole; the valve body is also provided with a first connecting oil that connects the hydraulic station and the annular groove Port and a second connecting oil port connecting the hydraulic station and the central hole, the valve core is provided with a A second through hole which is matched with the oil receiving port and communicates with the central hole. In this way, the structure of the entire oil inlet line and the oil return line is relatively simple, it can be understood that other structures can also be provided, for example, each oil inlet or oil return port is connected to the hydraulic station through a hose, so that the valve core and the valve The body structure is more complicated. It should be noted that the center hole here is not the "process hole used to determine the center of the workpiece" in the general machining, but a hole that is consistent with the axis of the valve core and is used to accommodate hydraulic oil.

In one embodiment, the valve core may also be provided with two annular grooves at both ends of the inner cavity of the valve body, one of the two annular grooves is provided with the second through hole and the other A third through hole communicating with the central hole is opened. Through the second through hole and the third through hole, the hydraulic oil of the hydraulic station can fill the entire cavity formed by the valve body and the valve core to ensure the oil in the oil outlet or the oil inlet Will not leak to both sides.

In one embodiment, the reversing mechanism may further include a motor that drives the spool to rotate, one end of the spool is located in the cavity of the valve body, and the other end of the spool passes through the valve The body is connected to the output shaft of the motor. The motor is used to drive the valve core to rotate, which has high speed, simple structure and convenient control. It can be understood that other power components are also possible, such as hydraulic motors and the like.

In one embodiment, the motor may be a variable frequency motor. In this way, the speed of the motor can be conveniently adjusted, so that the pile hammer machine generates different impact forces and vibrations, and adapts to different soil qualities. Understandably, the normal operation will not be affected if the motor is not adjusted.

In one embodiment, the valve body may also be provided with a valve core sleeve, and the valve core sleeve is provided with an accommodating space which is open at both ends; the valve core is penetrated at one end of the inner cavity of the valve body In the accommodating space, the valve core and the valve core sleeve are provided with sealing structures at the joints of both ends; the outer wall of the valve core sleeve is fixed to the inner cavity of the valve body. This design of separating the valve body and the valve core sleeve can ensure the machining accuracy of the valve core sleeve and better ensure that the hydraulic oil will not leak.

In one embodiment, the sealing structure may be a labyrinth type sealing structure. Since the valve core rotates at high speed during operation, the sealing structure also needs to be adapted. Of course, there are many other sealing structures that can also adapt to the high-speed rotation of the shaft and will not be described in detail.

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

FIG. 1 is a schematic diagram of a hydraulic linear impact vibration pile hammer machine according to an embodiment of the present invention. As shown in FIG. 1, the pile hammer machine includes an impact vibration base 11, a hydraulic cylinder 12 that applies impact and vibration to the impact vibration base 11, A hydraulic station 13 that drives the hydraulic cylinder 12 and a reversing mechanism that changes the direction of the hydraulic oil entering the hydraulic cylinder 12 at a preset frequency; the hydraulic cylinder 12 includes a cylinder body 121 and a piston rod 122, the cylinder body 121 is fixed to the impact vibration base 11, the piston rod 122 is fixed with an impact hammer 15; the impact hammer 15 exerts an impact on the impact vibration base 11 when the piston rod 122 moves, and the cylinder 121 is When the piston rod 122 moves, it vibrates the impact vibration base 11.

In this embodiment, below the impact vibration base 11 is a pile body 19, and the impact vibration base 11 and the pile body 19 are fixed by a hydraulic clamp 20. The reversing mechanism is connected to the hydraulic station 13 and the hydraulic cylinder 12 through a hose 21.

In this embodiment, as shown in FIGS. 2 and 3, the bottom end of the cylinder 121 is fixed to the top end of the impact vibration base 11 by screws, so that the vibration of the cylinder 121 can be directly transmitted to the impact vibration Block 11.

In this embodiment, the piston rod 122 is disposed above the hydraulic cylinder 12 and the movement direction is vertical; the impact hammer 15 includes a fixed portion 151 and an impact portion 152, the fixed portion 151 and the The piston rod 122 is fixed, and the impact portion 152 extends from above the cylinder 121 along the periphery of the cylinder 121 to the impact vibration base 11. Since the piston rod 122 is arranged above the hydraulic cylinder 12, according to the hydraulic principle, it can be known that because the area of the piston with a rod cavity above is small, the downward speed is greater, that is, the downward stroke is greater than the upward stroke, each downward, The impact hammer 15 will hit the impact vibration base 11. Therefore, when the piston rod 122 moves downward, the impact hammer 15 is driven to exert an impact on the impact vibration base 11.

In this embodiment, the fixing portion 151 is fixed to the piston rod 122 by screws; the fixing portion 151 and the impact portion 152 are also fixed by screws. It can be understood that the fixing portion 151 and the impact portion 152 It can be one.

In this embodiment, in order to further increase the impact force and vibration of the pile hammer machine, the pile hammer machine is also provided with an impact strengthening mechanism, and the impact strengthening mechanism includes an elastic member provided on the impact vibration base 11; In the embodiment, the elastic member is a compression spring 111, and the compression spring 111 is provided with six uniformly around the entire impact hammer 15, and the impact strengthening mechanism further includes a spring fixing column 112, a spring compression ring 113 and a spring A fixing cap 114, the spring fixing column 112 is fixed on the impact vibration base 11, the inner end of the spring compression ring 113 is sleeved and fixed on the impact hammer 15, and the outer end is sleeved on the spring fixing column 112, And can slide up and down along the spring fixing column 112 under the influence of the impact hammer 15; the compression spring 111 is sleeved on the spring fixing column 112, and the bottom of the compression spring 111 is compressed against the spring Loop 113; The spring fixing cap 114 is sleeved on the top end of the spring fixing column 112 to prevent the compression spring 111 from coming out of the spring fixing column 112. In this way, when the impact hammer 15 moves upwards driven by the piston rod 122, the elastic member is compressed and stored energy; when the impact hammer 15 moves downwards driven by the piston rod 122, the The elastic force of the elastic member pushes the impact hammer 15 downward. Specifically, the compression spring 111 may be a butterfly spring.

In this embodiment, as shown in FIGS. 1 and 4, the reversing mechanism includes a valve body 16, a valve core 17 and a motor 18; one end of the valve core 17 is located in the inner cavity of the valve body 16, and the other end The valve body 16 is connected to the output shaft of the motor 18. The valve core 17 is a main body that changes the direction of the hydraulic oil. The valve body 16 is used to accommodate the valve core 17. In order that the oil flowing in and out of the valve core 17 will not lose energy due to leakage, the valve body 16 contains The cavity of the valve core 17 is sealed from the outside. The motor 18 is used to drive the spool 17 to rotate, and the spool 17 is driven by the motor 18, which has the characteristics of high speed, simple structure and convenient control. In this embodiment, the other end of the valve core 17 is connected to the output shaft of the motor 18 through a coupling.

In this embodiment, as shown in FIG. 4, in order to more easily ensure the sealing of the valve body 16, the valve body 16 is further provided with a valve core sleeve 161, and the valve core sleeve 161 is provided with accommodating spaces open at both ends; The spool 17 is penetrated into the accommodating space at one end of the inner cavity of the valve body 16. The connection between the spool 17 and the spool sleeve 161 is provided with a labyrinth seal structure 171 at both ends. A plurality of annular grooves are formed on the outer circular surface of the valve core 17 in a zigzag shape; such a sealing structure can adapt to the high-speed rotation of the valve core 17 during operation; the outer wall of the valve core sleeve 161 is fixed to the valve body 16 The inner cavity is specifically fixed by screws 162.

In this embodiment, in order to rotate the spool 17 at high speed in the spool sleeve 161, rolling bearings 168 are provided at both ends of the spool sleeve 161, and the rolling bearings are provided at both ends of the spool 17 168 mating journal.

In this embodiment, as shown in FIGS. 4 and 5, the valve body 16 is provided with a first working oil port 163 and a second working oil port 164 connected to the hydraulic cylinder 12. In this embodiment, the first The working oil port 163 and the second working oil port 164 are both opened on the outer circumference of the valve body 16 and are axially aligned;

As shown in FIGS. 4 and 6, the outer circumference of the spool 17 is provided with two circumferential and radial positions around the entire spool 17 respectively corresponding to the first working oil port 163 and the second working oil port 164 Connection area, each of the connection areas includes oil outlets and oil inlets, the number of which is four, and the oil outlets and the oil inlets are alternately arranged on the circumference of the shaft Evenly aligned, that is, there are eight rows of oil ports in the circumferential direction and two columns in the axial direction;

During operation, the initial working position of the spool 17 is equivalent to the above-mentioned first working position. The first working oil port 163 and the second working oil port 164 are respectively aligned with the oil ports of the two connection areas, and The types of the oil ports aligned with the first working oil port 163 and the second working oil port 164 are different, that is, one of the working oil ports is aligned with the oil outlet, and the other working oil port can only be aligned with the oil inlet. In order to form a loop circuit. When the spool 17 rotates one eighth of a circle, which corresponds to the above-mentioned second working position, the oil ports aligned with the first working oil port 163 and the second working oil port 164 are exchanged, and enter the hydraulic pressure of the hydraulic cylinder 12 The direction of the oil is changed, that is, the direction of movement of the piston rod 122 of the hydraulic cylinder 12 is changed.

In this embodiment, as shown in FIGS. 5, 6, and 7, the spool 17 is provided with an annular groove 173 surrounding the outer circumference of the entire spool 17 on the outer circular surface between the two connection areas. The opening is a U-shaped groove 174 opened in the connection area and axially communicating with the annular groove 173; the valve core 17 is also provided with a central hole 175 which extends axially and has an axis consistent with the axis of the valve core 17, the inlet The oil port is a first through hole 176 opened in the connection area and radially communicating with the central hole 175; the U-shaped groove 174 and the central hole 175 are not in radial communication, and the first through hole 176 It does not communicate with the annular groove 173 in the axial direction; thus, from the annular groove 173, after passing through the U-shaped groove 174, it enters the first working oil port 163 or the second working oil port 164 The pipeline constitutes an oil inlet pipeline; starting from the first working oil port 163 or the second working oil port 164, passing through the first through hole 176, the central hole 175, and finally flowing to the hydraulic station 13 for oil return The pipeline constitutes an oil return pipeline; the valve body 16 is also provided with a first connecting oil port 165 communicating the hydraulic station 13 and the annular groove 173 and communicating the liquid Station 13 and the central bore 175 of the second connecting port 166, the valve body 17 defines a fitting 166 is connected to the second port and the second through hole 175 communicating with the central bore 177.

In this embodiment, the valve core 17 is further provided with two annular grooves at both ends of the inner cavity of the valve body 16, and one of the two annular grooves is provided with the second through hole 177, and the other A third through hole 178 communicating with the central hole 175 is opened. Through the second through hole 177 and the third through hole 178, the hydraulic oil of the hydraulic station 13 can fill the entire cavity formed by the valve body 16 and the valve core 17, ensuring the oil outlet or the The oil in the oil inlet will not leak to both sides.

In this embodiment, in order to facilitate the processing of the central hole 175, one end of the central hole 175 penetrates one end of the valve core 17, as shown in FIGS. 4, 6, and 7, the left end of the central hole 175 penetrates In order to avoid oil leakage, a plug 179 is installed on the left end. In order to facilitate the processing of the U-shaped groove 174 and the first through hole 176, and to facilitate the entry and exit of hydraulic oil, as shown in FIG. There is also a trumpet hole with a trapezoid cross section facing outward.

In this embodiment, as shown in FIGS. 5 and 8, the spool sleeve 161 is provided with the first working oil port 163, the second working oil port 164, the first connecting oil port 165 and the second connecting oil port The 166 is matched with the through hole, so that both the hydraulic oil provided by the hydraulic station 13 and the hydraulic oil returned by the hydraulic cylinder 12 can smoothly pass through the valve core 17.

In this embodiment, the motor 18 is a variable frequency motor. In this way, the rotating speed of the motor 18 can be conveniently adjusted, so that the pile hammer machine generates different impact forces and vibrations to adapt to different soil qualities.

The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in Within the protection scope of the present invention.

Industrial applicability

The hydraulic linear impact vibratory pile hammer machine of the embodiment of the present invention applies impact and vibration to the impact vibrating seat at the same time through the impact hammer and the cylinder body, and the vibration and impact coupling generates greater pile sinking force, and has a fast pile driving speed and high mechanical efficiency.

Claims

Hydraulic linear impact vibration pile hammer machine, the pile hammer machine includes an impact vibration base, a hydraulic cylinder applying impact and vibration to the impact vibration base, a hydraulic station driving the hydraulic cylinder, and changing into the hydraulic pressure at a preset frequency Reversing mechanism of the direction of the hydraulic oil of the cylinder;

The hydraulic cylinder includes a cylinder body and a piston rod, the cylinder body is directly or indirectly fixed to the impact vibration seat, the piston rod is fixed with an impact hammer; the impact hammer An impact vibration seat applies an impact, and the cylinder body vibrates the impact vibration seat when the piston rod moves.
The hydraulic linear impact vibration pile hammer machine according to claim 1, wherein the piston rod is disposed above the hydraulic cylinder, and the moving direction is a vertical direction; the bottom end of the cylinder body is fixed to the impact The top end of the vibration base; the impact hammer includes a fixed portion and an impact portion, the fixed portion is fixed to the piston rod, the impact portion extends from above the cylinder along the periphery of the cylinder toward the impact vibration base ; When the piston rod moves, it drives the impact hammer to move and impinges on the impact vibration base.
The hydraulic linear impact vibration pile hammer machine according to claim 1, wherein the pile hammer machine is further provided with an impact strengthening mechanism, and the impact strengthening mechanism includes an elastic member provided on the impact vibration base; the impact hammer When the piston rod moves upward, the elastic member is compressed and stored energy; when the impact hammer moves downward with the piston rod, the elastic force of the elastic member pushes the impact hammer toward Exercise.
The hydraulic linear impact vibration pile hammer machine according to claim 1 or 2, wherein the reversing mechanism includes a valve body with an inner cavity sealed and a spool that can be rotated at one end provided in the inner cavity of the valve body; The valve body is provided with a first working oil port and a second working oil port connected to the hydraulic cylinder, the valve core is provided with an oil inlet pipe and an oil return pipe connected to the hydraulic station; the oil inlet pipe includes at least one An oil outlet that can communicate with the first working oil port or the second working oil port, and the oil return line includes at least one oil inlet that can communicate with the second working oil port or the first working oil port mouth;

The valve core is preset with at least two working positions uniformly distributed in the circumference within a rotating circle; when the valve core rotates to the first working position, the oil outlet communicates with the second working oil port, The oil inlet communicates with the first working oil port; when the spool rotates to the second working position, the oil outlet communicates with the first working oil port, and the oil inlet communicates with the second Working port; wherein, the first working position and the second working position are working positions adjacent in the circumferential direction of the valve core.
The hydraulic linear impact vibratory pile hammer machine according to claim 4, wherein the first working oil port and the second working oil port are both opened on the outer circumference of the valve body and are axially aligned; the valve The outer circumference of the core is provided with two connection areas around the entire circumference of the valve core, and the radial positions respectively correspond to the first working oil port and the second working oil port. The oil outlets and the oil inlets are alternately arranged in a circle of oil outlets. The oil outlets in the two connection areas are both aligned in the axial direction, and the types of the two oil outlets aligned in the axial direction are different.
The hydraulic linear impact vibratory pile hammer machine according to claim 5, wherein the spool is provided with an annular groove surrounding the entire spool outer circle surface between the two connection areas, and the oil outlet A U-shaped groove opened axially to the annular groove for the connection area; the valve core is also provided with a central hole that extends axially and has an axis consistent with the axis of the valve core, and the oil inlet is the connection A first through hole opened in the area and communicating with the central aperture; the U-shaped groove and the central hole are not in radial communication, and the first through hole and the annular groove are not in axial communication;

The oil inlet pipeline starts from the annular groove and flows into the first working oil port or the second working oil port after passing through the U-shaped groove; the oil return pipeline is from the The first working oil port or the second working oil port, after passing through the first through hole and the central hole, flows to the hydraulic station to return oil; the valve body is also provided with a connection to the hydraulic A first connecting oil port of the station and the annular groove and a second connecting oil port connecting the hydraulic station and the center hole, the valve core is provided with a second connecting oil port to cooperate with the center The second through hole communicating with the hole.
The hydraulic linear impact vibration pile hammer machine according to claim 6, wherein the valve core is further provided with two annular grooves at both ends of the inner cavity of the valve body, and one of the two annular grooves is provided with The second through hole has a third through hole communicating with the central hole.
The hydraulic linear impact vibration pile hammer machine according to claim 4, wherein the reversing mechanism further includes a motor that drives the spool to rotate, and one end of the spool is located in the cavity of the valve body, the valve The other end of the core passes through the valve body and is connected to the output shaft of the motor; the motor is a variable frequency motor.
The hydraulic linear impact vibration pile hammer machine according to claim 4, wherein the valve body is further provided with a spool sleeve, and the spool sleeve is provided with an accommodating space with open ends at both ends; One end of the inner cavity of the valve body penetrates the accommodating space, and a sealing structure is provided at the connection between the valve core and the valve core sleeve; the outer wall of the valve core sleeve is fixed to the inner cavity of the valve body.
The hydraulic linear impact vibration pile hammer machine according to claim 9, wherein the sealing structure is a labyrinth type sealing structure.