Flow control system of hydraulic pile driver and crawler-type hydraulic pile driver

Abstract

The utility model provides a hydraulic pile driver flow control system and a crawler-type hydraulic pile driver. The flow control system of the hydraulic pile driver comprises a main pump connected with a first pilot oil way and a second pilot oil way; the first pilot oil way is used for controlling the lifting action of the big arm when being conducted; the second pilot oil way is used for controlling the pile hammer to vibrate when being conducted; the two-position on-off valve is respectively connected with the first pilot oil way, the second pilot oil way and the overflow valve; when the second pilot oil way is switched on, the two-position on-off valve is controlled to be in a switched-on state; when the second pilot oil way is disconnected, the two-position on-off valve is controlled to be in a disconnected state; the overflow valve is also connected with a preset oil tank; an excavator vehicle control unit; and the whole excavator control unit is connected with the overflow valve. According to the scheme, the pile pulling process has continuity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pile driver technical field, especially relates to a hydraulic pile driver flow control system and caterpillar hydraulic pile driver. BACKGROUND

[0002] The pile driver is a kind of special equipment by replacing the excavator front device into special type pile driver arm, and is equipped with high-speed rotating hydraulic pile hammer, and various piles are punched into or pulled out the ground.The pile hammer is separated by high-frequency vibration Pile body and medium, and the Pile body is separated from medium by boom cylinder lifting action.The vibration frequency of pile hammer determines the working efficiency.

[0003] The action of pile hammer and boom lifting action generally carries out simultaneously when caterpillar hydraulic pile driver is operated, and the following is the description of action process: driver simultaneously controls pile hammer vibration switch and boom lifting operation handle, will "control valve optional valve core" and "control valve boom valve core" are connected simultaneously, and the oil circuit from main pump is used to supply pile hammer vibration and boom lifting two actions simultaneously."Control valve boom valve core" is arranged before "control valve optional valve core", and priority is higher, and the valve core of two control valves is parallel oil supply, and boom lifting action will certainly disperse the oil supply of "control valve optional valve core".Before action, boom cylinder pressure is gradually established from low to high, but after action, due to the friction of Pile body and medium changes from static friction to dynamic friction load, suddenly becomes small, leading to the pressure in cylinder suddenly becomes small, and flow is preferentially directed to the place where load is lower, thereby the flow to pile hammer vibration, the vibration frequency of pile hammer is influenced, and the efficiency of Pile body pulling out is reduced. UTILITY MODEL CONTENTS

[0004] The utility model embodiment provides a kind of hydraulic pile driver flow control system and caterpillar hydraulic pile driver to solve the problem of low efficiency of Pile body pulling out of caterpillar hydraulic pile driver.

[0005] To solve the above technical problem, the utility model uses the following technical scheme:

[0006] The utility model embodiment provides a kind of hydraulic pile driver flow control system, comprising:

[0007] Main pump is connected with first pilot oil circuit and second pilot oil circuit respectively;The first pilot oil circuit is used to control the action of boom lifting when being conducted;The second pilot oil circuit is used to control the vibration action of pile hammer when being conducted;

[0008] Two-position on-off valves connected to the first pilot oil line, the second pilot oil line and the overflow valve respectively; the second pilot oil line is in the on state, the two-position on-off valve is in the on state; the second pilot oil line is in the off state, the two-position on-off valve is in the off state; the overflow valve is also connected to a preset oil tank.

[0009] The excavator vehicle control unit is connected to the overflow valve.

[0010] Optionally, the hydraulic pile driver flow control system further comprises:

[0011] A throttle hole is arranged between the two-position on-off valve and the overflow valve.

[0012] Optionally, the hydraulic pile driver flow control system further comprises:

[0013] A boom lifting operation handle and a control valve boom spool;

[0014] The control valve boom spool is arranged on the first pilot oil line;

[0015] The boom lifting operation handle is connected to the control valve boom spool;

[0016] By changing the handle action in the boom lifting operation handle, the handle valve body in the boom lifting operation handle is switched between on and off, and the pilot oil in the first pilot oil line pushes the control valve boom spool to switch between on and off.

[0017] Optionally, the hydraulic pile driver flow control system further comprises:

[0018] A pile hammer pilot solenoid valve and a control valve optional spool;

[0019] The control valve optional spool is arranged on the second pilot oil line;

[0020] The pile hammer pilot solenoid valve is connected to the control valve optional spool;

[0021] The pile hammer pilot solenoid valve receives an electrical signal, and the spool in the pile hammer pilot solenoid valve is switched between on and off, and the pilot oil in the second pilot oil line pushes the control valve optional spool to switch between on and off.

[0022] Optionally, the hydraulic pile driver flow control system further comprises:

[0023] A pressure sensor;

[0024] The pressure sensor is arranged on an oil line between the excavator whole vehicle control unit and the control valve optional spool.

[0025] Optionally, the hydraulic pile driver flow control system further comprises:

[0026] A pile hammer vibration switch and a current fuse, the pile hammer vibration switch is connected with the pile hammer pilot electromagnetic valve and the current fuse respectively.

[0027] The utility model embodiment provides a tracked hydraulic pile driver, comprising the hydraulic pile driver flow control system as described above.

[0028] The utility model has the advantages of:

[0029] In the scheme of the application, in the case of separately controlling the boom operation, the first pilot oil line is turned on, and the two-position on-off valve is in the off state; in the case of simultaneously controlling the boom and pile operation, the first pilot oil line and the second pilot oil line are both turned on, and the pilot oil flowing out of the main pump will pass through the two-position on-off valve and the overflow valve in turn, realizing the adjustment of the flow distribution of the pile hammer vibration and the boom lifting operation handle action, so that the pile pulling process has continuity. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The hydraulic circuit diagram of the hydraulic pile driver flow control system provided by the utility model embodiment is shown.

[0031] MARK NUMBER EXPLANATION:

[0032] The main pump 1;

[0033] The two-position on-off valve 2;

[0034] The overflow valve 3;

[0035] The excavator whole vehicle control unit 4;

[0036] The throttle hole 5;

[0037] The boom lifting operation handle 6;

[0038] The control valve boom spool 7;

[0039] The pile hammer pilot electromagnetic valve 8;

[0040] The control valve optional spool 9;

[0041] The pressure sensor 10;

[0042] The pile hammer vibration switch 11;

[0043] And the hydraulic fuse 12. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and advantages to be solved by the utility model more clear, the following will be described in detail in combination with the drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the utility model. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the utility model. In addition, in order to be clear and concise, the description of known functions and structures is omitted.

[0045] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0046] The utility model provides a kind of hydraulic pile driver flow control system and caterpillar hydraulic pile driver to the low efficiency problem of pile body pulling out of caterpillar hydraulic pile driver.

[0047] Referring to Figure 1 The hydraulic pile driver flow control system provided by the embodiment of the application comprises:

[0048] A main pump 1 is connected with a first pilot oil circuit and a second pilot oil circuit respectively; the first pilot oil circuit is used to control the vibration action of pile hammer when the first pilot oil circuit is conducted; the second pilot oil circuit is used to control the vibration action of pile hammer when the second pilot oil circuit is conducted;

[0049] A two-position on-off valve 2 and a relief valve 3 are connected with the first pilot oil circuit, the second pilot oil circuit and the relief valve 3 respectively; the second pilot oil circuit is used to control the two-position on-off valve 2 to be in the conducted state when the second pilot oil circuit is conducted; the second pilot oil circuit is used to control the two-position on-off valve 2 to be in the off state when the second pilot oil circuit is disconnected; the relief valve 3 is further connected with a preset oil tank;

[0050] A whole vehicle control unit 4 of excavator is connected with the relief valve 3.

[0051] Here, the whole vehicle control unit 4 of excavator is used to accept various input signals (switch, sensor, etc.), compare with the data stored in memory, and then output signals to each actuator to adjust the performance of excavator.

[0052] Optionally, the hydraulic pile driver flow control system further comprises:

[0053] A throttle hole 5 is arranged between the two-position on-off valve 2 and the overflow valve 3.

[0054] Optionally, the hydraulic pile driver flow control system further comprises:

[0055] A boom lifting operation handle 6 and a control valve boom spool 7;

[0056] The control valve boom spool 7 is arranged on the first pilot oil circuit;

[0057] The boom lifting operation handle 6 is connected with the control valve boom spool 7;

[0058] Wherein, by changing the handle action in the boom lifting operation handle 6, the handle valve body of the boom lifting operation handle 6 is switched between on and off, and the pilot oil in the first pilot oil circuit pushes the control valve boom spool 7 to switch between on and off.

[0059] Optionally, the hydraulic pile driver flow control system further comprises:

[0060] A pile hammer pilot solenoid valve 8 and a control valve optional spool 9;

[0061] The control valve optional spool 9 is arranged on the second pilot oil circuit;

[0062] The pile hammer pilot solenoid valve 8 is connected with the control valve optional spool 9;

[0063] Wherein, the pile hammer pilot solenoid valve 8 receives an electrical signal, the spool in the pile hammer pilot solenoid valve 8 is switched between on and off, and the pilot oil in the second pilot oil circuit pushes the control valve optional spool 9 to switch between on and off.

[0064] Optionally, the control valve optional spool 9 is arranged on the second pilot oil circuit, the second pilot oil circuit is connected with the excavator vehicle control unit 4; the control valve boom spool 7 is arranged on the first pilot oil circuit, the first pilot oil circuit is provided with the two-position on-off valve 2, the throttle hole 5 and the overflow valve 3; the overflow valve 3 is further connected with the excavator vehicle control unit 4 respectively; the main pump 1 is connected with the control valve optional spool 9 and the control valve boom spool 7 respectively; the main pump 1 of the application is used to provide high-pressure oil for vehicle action.

[0065] Wherein, when the control valve optional spool 9 is off and the control valve boom spool 7 is on, the two-position on-off valve 2 is in an off state; when the control valve optional spool 9 and the control valve boom spool 7 are both on, the pilot oil flowing out of the main pump 1 will pass through the two-position on-off valve 2, the throttle hole 5 and the overflow valve 3 in turn.

[0066] The big arm lifting operation handle 6 is connected with the control valve big arm spool 7; wherein, by changing the handle action in the big arm lifting operation handle 6, the connection and disconnection of the handle valve body of the big arm lifting operation handle 6 can be switched.

[0067] The pile hammer pilot electromagnetic valve 8 is connected with the control valve optional spool 9 and the big arm lifting operation handle 6 respectively; wherein, by inputting the electric signal to the pile hammer pilot electromagnetic valve 8, the connection and disconnection of the spool in the pile hammer pilot electromagnetic valve 8 can be switched.

[0068] In the embodiment of the application, the excavator whole vehicle control unit 4 is used for connecting the first pilot oil way and the second pilot oil way, the control valve big arm spool 7 is arranged on the first pilot oil way, the control valve optional spool 9, the two-position on-off valve 2, the throttle hole 5 and the overflow valve 3 are arranged on the second pilot oil way, and the first pilot oil way and the second pilot oil way are connected with the main pump 1 respectively. Wherein, the crawler hydraulic pile driver can perform the big arm lifting action alone, or simultaneously perform the big arm lifting action and the pile hammer vibration action.

[0069] It should be noted that the control valve optional spool 9 can be switched left and right under the push of the pilot oil, thereby controlling the flow direction of the high-pressure oil; the control valve big arm spool 7 can be switched left and right under the push of the pilot oil, thereby controlling the flow direction of the high-pressure oil. The spool of the two-position on-off valve 2 can be switched under the push of the pilot oil, so that the pilot oil way is in the connection and cut-off state. The throttle hole 5 is a hole installed in the throttle valve, which is used to limit the fluid flow, reduce the pressure and control the flow rate. When the system pressure exceeds the specified value, the overflow valve 3 is opened, and part of the flow in the system is discharged into the hydraulic oil tank, so that the pressure at the front end of the overflow valve does not exceed the allowable value.

[0070] In the application, when the big arm lifting action is performed alone, the control valve optional spool 9 is disconnected and the control valve big arm spool 7 is connected, and the two-position on-off valve 2 is in the disconnected state; specifically, the main pump 1 pushes the control valve big arm spool 7 to switch right through the first pilot oil, and the two-position on-off valve 2 is in the disconnected state, which does not affect the big arm lifting speed.

[0071] In the present application, when the boom lifting and the pile hammer vibration are operated simultaneously, the control valve optional spool 9 and the control valve boom spool 7 are both in the open state, and the two-position on-off valve 2 is in the open position. The main pump 1 controls the right switching of the control valve boom spool 7 through the first pilot oil control valve, and also sequentially passes through the two-position on-off valve 2, the throttle hole 5 and the overflow valve 3. When the pilot oil pushing the control valve boom spool 7 to switch to the right is greater than the set pressure of the overflow valve 3, the overflow valve 3 is open, so that part of the hydraulic oil flows back to the boom cylinder connected with the overflow valve 3. Due to the small degree of switching of the overflow valve 3 caused by the shunt, the inflow of the boom cylinder lifting action is limited, which can meet the high pressure and small flow action when the pile pulling action does not occur, and can also avoid the problem of the vibration frequency of the vibration hammer being reduced due to the shunt of the boom cylinder after the pile pulling action occurs.

[0072] In the present application, the boom lifting operation handle 6 is divided into a handle and a handle valve body. By swinging the handle of the boom lifting operation handle 6, the oil circuit of the handle valve body of the boom lifting operation handle 6 can be switched between on and off. The boom lifting operation handle 6 is connected with the control valve boom spool 7, so as to control the opening and closing of the boom lifting action.

[0073] In the present application, the spool in the pile hammer pilot electromagnetic valve 8 can switch left and right under the influence of the electric signal, so as to control the flow direction of the pilot oil. The pile hammer pilot electromagnetic valve 8 is connected with the control valve optional spool 9 and the boom lifting operation handle 6 respectively. Referring to the pile hammer pilot electromagnetic valve 8 in the Figure 1 , the pile hammer pilot electromagnetic valve 8 can switch left and right, so as to realize the switching of the “put down action DOWN” and the “lifting action UP”. In the Figure 1 , “BOOM” is to perform a specific action, which is the boom lifting action here. The pile hammer pilot electromagnetic valve 8 is also connected with a “pilot oil circuit”. The “pilot oil circuit” here can be a 40 bar pilot oil circuit. The 40 bar pilot oil can communicate with the control valve optional spool 9 through the oil port of Pb4. The 40 bar pilot oil also passes through the two-position on-off valve 2, the throttle hole 5 and the overflow valve 3, and then flows to the oil port of Pb3, so as to communicate with the control valve boom spool 7.

[0074] Optionally, the hydraulic pile driver flow control system further comprises:

[0075] a pressure sensor 10;

[0076] The pressure sensor 10 is arranged on the oil circuit between the excavator vehicle control unit 4 and the control valve optional spool 9.

[0077] Optionally, the hydraulic pile driver flow control system further comprises:

[0078] A pile hammer vibration switch 11 and a current fuse 12, the pile hammer vibration switch 11 is connected with the pile hammer pilot electromagnetic valve 8 and the current fuse 12 respectively.

[0079] In the embodiment of the application, the pressure sensor 10 has the characteristic of converting the pressure signal into the voltage signal. The pressure sensor 10 is arranged between the whole vehicle control unit 4 of the excavator and the control valve optional valve core 9, and is used for monitoring the vibration high-pressure oil line pressure of the pile hammer in real time, and feeding back to the whole vehicle control unit 4 of the excavator, comparing with the preset value stored in the memory of the whole vehicle control unit 4 of the excavator, and outputting the control signal to the overflow valve 3, dynamically adjusting the overflow pressure of the overflow valve 3, and realizing dynamic adjustment of the flow distribution of the pile hammer vibration and the boom lifting operation handle action.

[0080] In the embodiment of the application, the pile hammer vibration switch 11 is a switch with automatic return function, and the power is turned on when being pressed, and the power is turned off when being released.

[0081] The current fuse 12 is also called FUSE in the hydraulic system, and is a device capable of automatically fusing when the system current suddenly exceeds the rated value.

[0082] In summary, the hydraulic pile driver flow control system of the application makes the pile pulling process have continuity, the key action flow distribution is more reasonable, and the work efficiency is effectively improved.

[0083] The embodiment of the application also provides a tracked hydraulic pile driver, which comprises the hydraulic pile driver flow control system as described above.

[0084] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0085] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any priority. Thus, a feature defined with "first", "second", etc. can include one or more of the features implicitly or explicitly.

[0086] In the present application, unless specifically defined otherwise or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like are to be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0087] In the present application, unless specifically defined otherwise or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like are to be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0088] The above is the preferred embodiment of the present application, it should be pointed out that for ordinary personnel in this technical field, without departing from the principle of the present application, several improvements and refinements can also be made within the scope of protection of the present application.

Claims

1. A hydraulic pile driver flow control system, characterized by, Comprising: a main pump (1) connected with a first pilot oil path and a second pilot oil path respectively; the first pilot oil path is used to control the action of boom lifting when it is turned on; the second pilot oil path is used to control the action of pile hammer vibration when it is turned on; a two-position on-off valve (2) and a relief valve (3), the two-position on-off valve (2) is connected with the first pilot oil path, the second pilot oil path and the relief valve (3) respectively; the second pilot oil path controls the two-position on-off valve (2) to be in the on state when it is turned on; the second pilot oil path controls the two-position on-off valve (2) to be in the off state when it is turned off; the relief valve (3) is also connected with a preset oil tank; an excavator vehicle control unit (4); the excavator vehicle control unit (4) is connected with the relief valve (3).

2. The hydraulic pile driver flow control system of claim 1, wherein, The hydraulic pile driver flow control system further comprises: a throttle hole (5) provided between the two-position on-off valve (2) and the relief valve (3).

3. The hydraulic pile driver flow control system of claim 1, wherein, The hydraulic pile driver flow control system further comprises: a boom lifting operation handle (6) and a control valve boom spool (7); The control valve boom spool (7) is provided on the first pilot oil path; The boom lifting operation handle (6) is connected with the control valve boom spool (7); Wherein, by changing the handle action in the boom lifting operation handle (6), the handle valve body of the boom lifting operation handle (6) is switched between on and off, and the pilot oil in the first pilot oil path pushes the control valve boom spool (7) to switch between on and off.

4. The hydraulic pile driver flow control system of claim 1, wherein, The hydraulic pile driver flow control system further comprises: a pile hammer pilot electromagnetic valve (8) and a control valve optional spool (9); The control valve optional spool (9) is provided on the second pilot oil path; The pile hammer pilot electromagnetic valve (8) and the control valve optional spool (9) are connected; Wherein, the pile hammer pilot electromagnetic valve (8) receives an electrical signal, the spool in the pile hammer pilot electromagnetic valve (8) is switched between on and off, and the pilot oil in the second pilot oil path pushes the control valve optional spool (9) to switch between on and off.

5. The hydraulic pile driver flow control system of claim 4, wherein, The hydraulic pile driver flow control system further comprises: a pressure sensor (10); The pressure sensor (10) is provided on the oil path between the excavator vehicle control unit (4) and the control valve optional spool (9).

6. The hydraulic pile driver flow control system of claim 4, wherein, The hydraulic pile driver flow control system further comprises: a pile hammer vibration switch (11) and a safety device (12), the pile hammer vibration switch (11) is connected with the pile hammer pilot electromagnetic valve (8) and the safety device (12) respectively.

7. A hydraulic pile driver of the caterpillar type, characterized in that Comprising the hydraulic pile driver flow control system according to any one of claims 1 to 6.

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