Hydraulic system with vibration suppression function and engineering machinery having the same

Abstract

The present invention provides a hydraulic system with a vibration suppression function and an engineering machine with the same. The hydraulic system with a vibration suppression function includes: a boom cylinder; a bucket cylinder; a boom working link, the boom working link is provided with a first working oil port connected to a large boom cavity, and a second working oil port connected to a small boom cavity, and the boom working link controls the action of the boom cylinder by reversing; a bucket working link, the bucket working link is provided with a third working oil port connected to a large bucket cavity, and a fourth working oil port connected to a small bucket cavity, and the bucket working link controls the action of the bucket cylinder by reversing; an accumulator; a vibration suppression module, the vibration suppression module is integrated in the boom working link, and the vibration suppression module connects the boom working link and the accumulator to buffer the boom working link when the hydraulic system is working. The hydraulic system with a vibration suppression function of the present invention can increase the buffering of the boom, filter pressure shocks, and improve the working efficiency of the transporter.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a hydraulic system with a vibration suppression function and an engineering machinery having the same. Background Art

[0002] As a typical engineering vehicle, the transporter is a self-propelled equipment that integrates shoveling, loading, transporting and unloading. Its working process consists of six working conditions, namely: insertion condition, shoveling condition, heavy-load transport condition, lifting condition, unloading condition and empty-load walking condition. The shoveling and loading and unloading operations of the transporter are realized through the movement of the working device. The bucket is hinged to the boom and the bucket cylinder through a connecting rod or bracket to load and unload materials; the boom is hinged to the frame and the boom cylinder to lift and lower the bucket.

[0003] The hydraulic system of the working device of the transporter needs to meet the requirements of various working conditions during the operation, especially the heavy-load handling conditions. It should reduce the bumps during the driving of the transporter, as well as the vibration and noise of the whole machine caused by pressure shock. However, most transporters are still troubled by this problem. During the handling process, the transporter vibrates violently, resulting in insufficient driver comfort, serious material spillage, and poor safety, which seriously affects the work efficiency, service life of the transporter and the safety of construction workers. Summary of the invention

[0004] In view of this, the present invention provides a hydraulic system with a vibration suppression function, which can increase the buffering of the boom, filter the pressure shock, and improve the working efficiency of the transporter.

[0005] The invention also provides an engineering machine.

[0006] A hydraulic system with a vibration suppression function according to an embodiment of a first aspect of the present invention comprises: a boom cylinder, wherein a boom small chamber and a boom large chamber are defined in the boom cylinder; a bucket cylinder, wherein a bucket large chamber and a bucket small chamber are defined in the bucket cylinder; a boom working link, wherein a first working oil port communicating with the boom large chamber and a second working oil port communicating with the boom small chamber are provided on the boom working link, and the boom working link controls the movement of the boom cylinder by reversing; a bucket working link, wherein a third working oil port communicating with the bucket large chamber and a fourth working oil port communicating with the bucket small chamber are provided on the bucket working link, and the bucket working link controls the movement of the bucket cylinder by reversing; an accumulator, wherein the accumulator can be used to store energy of the boom working link and the bucket working link; a vibration suppression module, wherein the vibration suppression module is integrated in the boom working link, and wherein the vibration suppression module connects the boom working link and the accumulator to buffer the boom working link when the hydraulic system is working.

[0007] According to the hydraulic system with vibration suppression function of the embodiment of the present invention, by integrating the vibration suppression module into the boom working link, the hydraulic system with vibration suppression function enables the transporter to connect the boom and the accumulator under the transporting condition, thereby increasing the buffering of the boom and filtering the pressure shock, thereby improving the comfort of the driver and improving the working efficiency of the transporter.

[0008] The hydraulic system with vibration suppression function according to the embodiment of the present invention also has the following additional technical features.

[0009] According to one embodiment of the present invention, the hydraulic system with vibration suppression function also includes: a pressure reducing relief valve, which can be used to fill the accumulator with fluid so that the accumulator maintains a predetermined pressure value, and when the pressure value of the accumulator exceeds the pressure of the pressure reducing relief valve, the pressure reducing relief valve unloads the excess pressure.

[0010] According to one embodiment of the present invention, the hydraulic system with vibration suppression function further includes:

[0011] An inlet-return oil connection, which can be used to connect the inlet oil circuit and the return oil circuit and control the maximum pressure value of the accumulator; and a tail connection, which integrates the pressure reducing relief valve to provide a pilot oil pressure.

[0012] According to one embodiment of the present invention, the accumulator includes: a high-pressure switching solenoid valve, which can be used to detect changes in the vehicle speed and working conditions of the vehicle equipped with the hydraulic system. When it is detected that the hydraulic system is in a transporting condition, the high-pressure switching solenoid valve switches to switch the main valve core of the vibration suppression module from a cut-off state to a through state, the large chamber of the boom is connected to the accumulator, and the small chamber of the boom is connected to the return oil circuit.

[0013] According to one embodiment of the present invention, the main valve core of the vibration suppression module is a two-position four-way reversing valve, one side of the main valve core is respectively connected to the small chamber of the boom and the large chamber of the boom, and the other side is respectively connected to the accumulator and the return oil circuit.

[0014] According to one embodiment of the present invention, the vibration suppression module includes: a pressure differential unloading valve, which balances the pressure between the accumulator and the large chamber of the boom to reduce the pressure shock at the moment of switching when the high-pressure switching solenoid valve is energized; and a safety relief valve, which can be used to protect the accumulator.

[0015] According to one embodiment of the present invention, the hydraulic system with vibration suppression function further includes: a one-way valve, wherein the one-way valve cooperates with the pressure reducing and relief valve to charge the accumulator.

[0016] According to an embodiment of the present invention, the vibration suppression module includes: a solenoid valve, the solenoid valve is connected to the pressure reducing relief valve, and the solenoid valve closes the pressure reducing relief valve to cut off the filling circuit of the accumulator after being energized.

[0017] The engineering machinery according to the second embodiment of the present invention comprises the hydraulic system with vibration suppression function as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a hydraulic system with vibration suppression function according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] A hydraulic system 100 with vibration suppression function; an oil inlet and return connection 1; a boom working connection 2; a bucket working connection 3; a tail connection 4; a boom cylinder 5; an accumulator 6; a bucket cylinder 7; a locking valve 8; an electromagnetic switch valve 9; a main valve core 10; a differential pressure unloading valve 11; a safety relief valve 12; a one-way valve 13; an emergency unloading valve 14; a pressure reducing relief valve 15; and a solenoid valve 16. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] First, the hydraulic system 100 with vibration suppression function according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the hydraulic system 100 with vibration suppression function according to an embodiment of the present invention includes a boom cylinder 5, a bucket cylinder 7, a boom working link 2, a bucket working link 3, an accumulator 6 and a vibration suppression module (not shown).

[0026] Specifically, a small boom chamber and a large boom chamber are defined in the boom cylinder 5, a large bucket chamber and a small bucket chamber are defined in the bucket cylinder 7, a first working oil port (working oil port B1) connected to the large boom chamber, and a second working oil port (working oil port A1) connected to the small boom chamber are provided on the boom working link 2, the boom working link 2 controls the movement of the boom cylinder 5 by reversing, a third working oil port (working oil port B2) connected to the large bucket chamber, and a fourth working oil port (working oil port A2) connected to the small bucket chamber are provided on the bucket working link 3, the bucket working link 3 controls the movement of the bucket cylinder 7 by reversing, the accumulator 6 can be used to store energy of the boom working link 2 and the bucket working link 3, a vibration suppression module is integrated on the boom working link 2, and the vibration suppression module connects the boom working link 2 and the accumulator 6 to buffer the boom working link 2 when the hydraulic system is working. A vibration suppression module is integrated on the boom working link 2, so that the transporter can connect the boom and the accumulator 6 under the transporting condition, increase the buffering of the boom, filter the pressure shock, thereby improving the comfort of the driver and improving the working efficiency of the transporter.

[0027] Therefore, according to the hydraulic system 100 with vibration suppression function of the embodiment of the present invention, by integrating the vibration suppression module on the boom working link 2, the hydraulic system 100 with vibration suppression function enables the transporter to connect the boom and the accumulator 6 under the transporting condition, thereby increasing the buffering of the boom and filtering the pressure shock, thereby improving the comfort of the driver and improving the working efficiency of the transporter.

[0028] According to some specific embodiments of the present invention, the hydraulic system 100 with vibration suppression function also includes a pressure reducing relief valve 15, which can be used to fill the accumulator 6 with fluid so that the accumulator 6 maintains a predetermined pressure value, and when the pressure value of the accumulator 6 exceeds the pressure of the pressure reducing relief valve 15, the pressure reducing relief valve 15 unloads the excess pressure.

[0029] Specifically, when the pressure value of the accumulator 6 is too high, the pressure relief valve 15 will switch to the uppermost position to discharge a portion of the pressure oil to ensure the stability of the pressure of the accumulator 6. When the pressure of the oil inlet circuit P decreases and is lower than the pressure value of the accumulator 6, the one-way valve 13 can cut off the filling circuit of the accumulator 6 to maintain the pressure of the accumulator 6.

[0030] Optionally, the hydraulic system 100 with vibration suppression function further includes an oil inlet and return connection 1 and an oil tail connection 4 .

[0031] Specifically, the inlet and return oil connection 1 can be used to connect the oil inlet circuit and the oil return circuit and control the maximum pressure value of the accumulator 6 , and the tail connection 4 integrates a pressure reducing relief valve 15 to provide a pilot oil pressure.

[0032] That is to say, the oil inlet and return link 1 mainly connects the oil inlet and return of the system and controls the maximum pressure of the system. The hydraulic system 100 with vibration suppression function is also provided with a return oil back pressure valve to improve the oil replenishment capacity of the cylinder under some working conditions. The tail link 4 mainly acts as a cover plate and is integrated with a pressure reducing relief valve 15 to provide pilot oil pressure for the main valve switching of the entire system.

[0033] According to one embodiment of the present invention, the accumulator 6 includes a high-pressure switch solenoid valve, which can be used to detect changes in the speed and working conditions of a vehicle equipped with a hydraulic system. When it is detected that the hydraulic system is in a transporting condition, the high-pressure switch solenoid valve switches to switch the main valve core 10 of the vibration suppression module from a cut-off state to a through state, and the large chamber of the boom is connected to the accumulator 6, and the small chamber of the boom is connected to the return oil circuit. At the same time, the pressure relief valve 15 is also switched to the cut-off position to cut off the accumulator 6 and the filling circuit.

[0034] Preferably, the main valve core 10 of the vibration suppression module is a two-position four-way reversing valve, one side of the main valve core 10 is connected to the small boom chamber and the large boom chamber respectively, and the other side is connected to the accumulator 6 and the oil return circuit respectively.

[0035] According to one embodiment of the present invention, the vibration suppression module includes a differential pressure unloading valve 11 and a safety relief valve 12 .

[0036] Specifically, when the high-pressure switching solenoid valve is energized, the pressure differential unloading valve 11 balances the pressure between the accumulator 6 and the large chamber of the boom to reduce the pressure shock at the switching moment, and the safety relief valve 12 can be used to protect the accumulator 6 .

[0037] Specifically, the vibration suppression module is provided with a pressure differential unloading valve 11. When the high-pressure switch solenoid valve is energized, the pressure differential unloading valve 11 can quickly balance the pressure between the accumulator 6 and the large chamber of the boom, reducing the pressure shock at the moment of switching. The vibration suppression module is also provided with a safety relief valve 12, which protects the accumulator 6 and prevents the accumulator 6 from being over-pressured.

[0038] According to one embodiment of the present invention, the hydraulic system 100 with vibration suppression function further includes a one-way valve 13 , and the one-way valve 13 cooperates with the pressure reducing relief valve 15 to charge the accumulator 6 .

[0039] That is, the hydraulic system 100 with vibration suppression function includes a pressure reducing relief valve 15 and a one-way valve 13, and the system high-pressure oil circuit P circuit fills the accumulator 6 with fluid through the one-way valve 13 and the pressure reducing relief valve 15, and keeps the accumulator 6 at a certain pressure value.

[0040] According to another embodiment of the present invention, the hydraulic system 100 with vibration suppression function further includes a solenoid valve 16 , which is connected to the pressure reducing relief valve 15 . When the solenoid valve 16 is energized, the pressure reducing relief valve 15 is closed to cut off the filling circuit of the accumulator 6 .

[0041] Optionally, the boom working link 2 is provided with an electrically controlled boom locking valve, which ensures that the boom does not retract when the boom is in a raised static state, thereby improving the stability and safety of the transporter, and the boom large cavity is provided with an emergency unloading valve 14 for emergency purposes.

[0042] It should be noted that when the transporter reaches a certain speed under the transporting condition, the controller on the main machine will send a signal after detection and calculation to energize the solenoid valve 16. After the solenoid valve 16 is energized, it will quickly switch the pressure relief valve 15 to the lower position to cut off the accumulator 6 and the filling circuit. In addition, at this time, the pressure difference unloading valve 11 will also quickly compare the pressure values ​​of the first working oil port connected to the large chamber of the boom and the circuit of the accumulator 6, unload the excess pressure oil in the accumulator 6, balance the pressure values ​​on both sides, and minimize the pressure shock.

[0043] In addition, after the solenoid valve 16 is energized, one oil path will pass through the damping, exert pressure on the upper chamber of the main valve core 10, push the main valve core 10 to change direction, so that the first working oil port connected to the large chamber of the boom is connected to the accumulator 6, and the small chamber of the boom is connected to the oil return circuit T. At this time, the transporter enters the boom vibration reduction state, and the pressure shock generated in the first working oil port connected to the large chamber of the boom is attenuated and filtered through the accumulator 6. The transporter obtains a relatively stable state in the transporting condition, reduces the spillage of materials, and improves the comfort of the driver. As a result, the transporter obtains good performance without reducing the driving speed, and improves the work efficiency and economic benefits of the transporter.

[0044] The boom working link 2 is provided with an electric controlled boom locking valve, including a locking valve 8 and an electromagnetic switch valve 9. When the boom of the transporter is in a non-holding state, the controller on the host sends a signal to the electromagnetic switch valve 9 to release the locking function of the boom. When the transporter is in a holding state, the electromagnetic switch valve 9 loses power and the locking valve 8 is locked.

[0045] The vibration suppression module is provided with a safety relief valve 12 to protect the accumulator 6 and prevent the accumulator 6 from being over-pressurized. The first working oil port connected to the large chamber of the boom is provided with an emergency unloading valve 14, which can unload the pressure oil of the large chamber back to the T oil circuit in an emergency, so that the boom can be slowly lowered to eliminate safety hazards.

[0046] In summary, according to the hydraulic system 100 with vibration suppression function in an embodiment of the present invention, by integrating the vibration suppression module on the boom working link 2, the hydraulic system 100 with vibration suppression function enables the transporter to connect the boom and the accumulator 6 under the transporting condition, thereby increasing the buffering of the boom and filtering the pressure shock, thereby improving the comfort of the driver and improving the working efficiency of the transporter.

[0047] The engineering machinery according to the embodiment of the present invention comprises the hydraulic system 100 with vibration suppression function according to the above embodiment. Since the hydraulic system 100 with vibration suppression function according to the above embodiment of the present invention has the above technical effects, the engineering machinery according to the embodiment of the present invention also has the corresponding technical effects and has low production costs, which is conducive to achieving diversified shapes.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic system with vibration suppression function, characterized in that: include: A boom cylinder, wherein a small boom chamber and a large boom chamber are defined in the boom cylinder; A bucket cylinder, wherein a large bucket cavity and a small bucket cavity are defined in the bucket cylinder; A boom working link, wherein the boom working link is provided with a first working oil port communicating with the large chamber of the boom and a second working oil port communicating with the small chamber of the boom, and the boom working link controls the action of the boom cylinder by reversing; A bucket working link, wherein the bucket working link is provided with a third working oil port connected to the large chamber of the bucket and a fourth working oil port connected to the small chamber of the bucket, and the bucket working link controls the action of the bucket cylinder by reversing; An accumulator, the accumulator being capable of storing energy of the boom working link and the bucket working link; A vibration suppression module, the vibration suppression module is integrated on the boom working link, the vibration suppression module is connected to the boom working link and the accumulator when the hydraulic system is working to buffer the boom working link, one side of the main valve core of the vibration suppression module is respectively connected to the boom small chamber and the boom large chamber, and the other side is respectively connected to the accumulator and the oil return line; When the hydraulic system is in the transporting condition, the main valve core of the vibration suppression module is switched from the cut-off state to the through state, the large chamber of the boom is connected to the accumulator, and the small chamber of the boom is connected to the oil return line; The boom working joint is provided with an electric-controlled boom locking valve, which ensures that the boom does not retract when the boom is in a lifted static state, and the boom large cavity is provided with an emergency unloading valve.

2. The hydraulic system with vibration suppression function according to claim 1, characterized in that: Also includes: A pressure reducing relief valve can be used to charge the accumulator so that the accumulator maintains a predetermined pressure value, and when the pressure value of the accumulator exceeds the pressure of the pressure reducing relief valve, the pressure reducing relief valve unloads the excess pressure.

3. The hydraulic system with vibration suppression function according to claim 2, characterized in that: Also includes: An oil inlet-return link, which can be used to connect the oil inlet circuit and the oil return circuit and control the maximum pressure value of the accumulator; The tail connection integrates the pressure reducing relief valve to provide pilot oil pressure.

4. The hydraulic system with vibration suppression function according to claim 3, characterized in that: The accumulator comprises: A high-pressure switching solenoid valve, which can be used to detect changes in the vehicle speed and working conditions of the vehicle equipped with the hydraulic system. When it is detected that the hydraulic system is in a transporting condition, the high-pressure switching solenoid valve switches the main valve core of the vibration suppression module from a cut-off state to a through state. The large chamber of the boom is connected to the accumulator, and the small chamber of the boom is connected to the return oil circuit.

5. The hydraulic system with vibration suppression function according to claim 4, characterized in that: The main valve core of the vibration suppression module is a two-position four-way reversing valve.

6. The hydraulic system with vibration suppression function according to claim 5, characterized in that: The vibration suppression module comprises: A pressure differential unloading valve, which balances the pressure between the accumulator and the large chamber of the boom to reduce the pressure shock at the moment of switching when the high-pressure switch solenoid valve is energized; A safety overflow valve can be used to protect the accumulator.

7. The hydraulic system with vibration suppression function according to claim 6, characterized in that: Also includes: A one-way valve cooperates with the pressure reducing relief valve to charge the accumulator.

8. The hydraulic system with vibration suppression function according to claim 7, characterized in that: Also includes: A solenoid valve is connected to the pressure reducing relief valve. When the solenoid valve is energized, the pressure reducing relief valve is closed to cut off the filling circuit of the accumulator.

9. An engineering machine, characterized in that: A hydraulic system with vibration suppression function comprising any one of claims 1-8.

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