CN211774100U - Working device buffer system and engineering equipment - Google Patents
Working device buffer system and engineering equipment Download PDFInfo
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- CN211774100U CN211774100U CN201922089381.6U CN201922089381U CN211774100U CN 211774100 U CN211774100 U CN 211774100U CN 201922089381 U CN201922089381 U CN 201922089381U CN 211774100 U CN211774100 U CN 211774100U
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Abstract
The invention discloses a buffer system of a working device and engineering equipment, which comprise a large-cavity oil way, a small-cavity oil way, an energy accumulator, a first oil way, a second oil way and a third oil way, wherein the large-cavity oil way is communicated with the small-cavity oil way; one end of the second oil way and one end of the third oil way are both connected with the large-cavity oil way, the other ends of the second oil way and the third oil way are both connected with the energy accumulator, one end of the first oil way is connected with the small-cavity oil way, and the other end of the first oil way is connected with the oil tank; the path for supplying oil to the energy accumulator in the third oil way is communicated; when the working device buffering system is in a first working state, a path for supplying oil to a rodless cavity of the movable arm oil cylinder in the large cavity oil way is communicated, a path for supplying oil to a rod cavity of the movable arm oil cylinder in the small cavity oil way is communicated, a path for supplying oil to the energy accumulator in the second oil way is communicated, and a path for supplying oil to the oil tank in the first oil way is communicated. The invention has the following beneficial effects: the large-cavity oil way is communicated with the third oil way in the lifting process of the movable arm, so that the pressure difference between the rodless cavity and the energy accumulator is almost zero, the oil mixing phenomenon in the system after the lifting is finished is avoided, and the vibration and impact phenomena of the movable arm are eliminated.
Description
Technical Field
The invention belongs to the technical field of engineering machinery control, and particularly relates to a working device buffer system engineering device.
Background
At present, engineering machinery excavates and loads products, generally arranges a loading working device at the front end of a whole vehicle, the loading working device can carry out short-distance transportation after loading, and the vibration generated in the driving process can be transmitted to a cab through a vehicle frame, so that the driving stability of the whole vehicle is reduced. When the whole vehicle runs on a rough road, the running buffer system is started, vibration generated by the loading working device is transmitted to the energy accumulator through the rodless cavity of the movable arm oil cylinder, the energy accumulator absorbs the vibration to realize shock absorption, and the rod cavity is supplemented with oil through the hydraulic oil tank to avoid the rod cavity of the movable arm cylinder from being empty.
After the loading device finishes the loading work, a hydraulic buffer system is started, at the moment, hydraulic oil possibly does not exist in the energy accumulator in advance or the pressure of the residual hydraulic oil is not equal to the pressure in the large cavity of the movable arm oil cylinder, the hydraulic oil in the rodless cavity of the movable arm oil cylinder generates an oil mixing phenomenon because of the pressure difference between the hydraulic oil and the energy accumulator until the pressure in the energy accumulator is equal to the pressure in the rodless cavity of the movable arm oil cylinder, the whole loading device can drop and shake to different degrees in the process, certain impact can be generated on a loading arm and a buffer valve, and the service life of the loading device is influenced.
Disclosure of Invention
The invention aims to overcome the defect of inconvenient use in the prior art, and provides a working device buffer system and engineering equipment, which can enable a rodless cavity of a movable arm oil cylinder and an energy accumulator to have the same pressure when a movable arm lifts, so that the phenomenon of oil leakage of the system after the movable arm lifts is avoided.
In order to solve the prior art problem, the invention discloses a buffer system of a working device, which comprises a large-cavity oil way connected with a rodless cavity of a movable arm oil cylinder and a small-cavity oil way connected with a rod cavity of the movable arm oil cylinder, wherein the small-cavity oil way comprises an energy accumulator, a first oil way, a second oil way and a third oil way;
one end of the second oil way and one end of the third oil way are both connected with the large-cavity oil way, the other ends of the second oil way and the third oil way are both connected with the energy accumulator, one end of the first oil way is connected with the small-cavity oil way, and the other end of the first oil way is connected with an oil tank;
a path for supplying oil to the accumulator in the third oil passage is communicated;
when the working device buffer system is in a first working state, a path for supplying oil to a rodless cavity of the movable arm oil cylinder in the large cavity oil way is communicated, a path for supplying oil to a rod cavity of the movable arm oil cylinder in the small cavity oil way is communicated, a path for supplying oil to the energy accumulator in the second oil way is communicated, and a path for supplying oil to the oil tank in the first oil way is communicated.
Further, the air conditioner is provided with a fan,
when the working device buffer system is in a second working state, a path for supplying oil to a rodless cavity of the movable arm oil cylinder in the large cavity oil way is closed, a path for supplying oil to a rod cavity of the movable arm oil cylinder in the small cavity oil way is closed, the second oil way is conducted in a two-way mode, and the first oil way is conducted in a two-way mode.
Further, the air conditioner is provided with a fan,
when the working device buffer system is in a third working state, a path for supplying oil to the rodless cavity of the movable arm oil cylinder in the large cavity oil way is communicated, a path for supplying oil to the rod cavity of the movable arm oil cylinder in the small cavity oil way is communicated, a path for supplying oil to the energy accumulator in the second oil way is communicated, and a path for supplying oil to the oil tank in the first oil way is communicated.
Further, the air conditioner is provided with a fan,
the first oil way is connected in series with a first control valve with a one-way conduction position and a two-way conduction position, the second oil way is connected in series with a second control valve with a one-way conduction position and a two-way conduction position, and the third oil way is connected in series with a one-way valve.
Further, the air conditioner is provided with a fan,
and a constant flow valve is connected in series in the third oil way.
Further, the air conditioner is provided with a fan,
the accumulator is connected with the oil tank through a buffer valve, and the opening pressure of the buffer valve is smaller than the maximum pressure of the accumulator.
Further, the air conditioner is provided with a fan,
the first control valve, the second control valve, the one-way valve, the constant flow valve and the buffer valve are integrated into a valve group.
Further, the air conditioner is provided with a fan,
the oil port A of the multi-way valve is connected with the small cavity oil way, the oil port B of the multi-way valve is connected with the large cavity oil way, the oil port P of the multi-way valve is connected with the main pump, and the oil port T of the multi-way valve is connected with the oil tank;
the working device buffer system is in a first working state, the oil port A is communicated with the oil port T, and the oil port P is communicated with the oil port B;
the working device buffer system is in a second working state, and the oil port A, the oil port T, the oil port P and the oil port B are not communicated with each other;
and the working device buffer system is in a third working state, and the oil port B is communicated with the oil port T.
Further, the air conditioner is provided with a fan,
the first working state corresponds to a lifting state of a boom in the working device, the second working state corresponds to a maintaining state of the boom in the working device, and the third working state corresponds to a falling state of the boom in the working device.
The invention also discloses engineering equipment which comprises a working device with a movable arm and a control system for driving the movable arm, wherein the control system is the working device buffer system.
The invention has the following beneficial effects: the large-cavity oil way is communicated with the third oil way in the lifting process of the movable arm, so that the pressure difference between the rodless cavity of the movable arm oil cylinder and the energy accumulator is almost zero, the oil mixing phenomenon in the system can be avoided after the movable arm is lifted, and the vibration and impact phenomena of the movable arm are eliminated.
Drawings
FIG. 1 is a hydraulic schematic of a work implement damping system according to the present invention;
FIG. 2 is a schematic diagram of the work implement buffering system of FIG. 1 in a first operating condition (bold line of the drawing indicates the pressure oil flow path);
FIG. 3 is a schematic diagram of the work implement damping system of FIG. 1 in a second operating condition (bold line of the drawing indicates a pressure oil flow path);
fig. 4 is an operational schematic diagram of the damper system of the working device shown in fig. 1 in a third operational state (a thick line of the drawing indicates a pressure oil flow path).
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention discloses engineering equipment which comprises a working device with a movable arm and a working device buffer system for driving the movable arm.
As shown in fig. 1, the working device damping system includes a large-chamber oil passage connected to the rodless chamber of the boom cylinder 6 and a small-chamber oil passage connected to the rod chamber of the boom cylinder 6, and includes an accumulator 4, a multi-way valve 3, a first oil passage, a second oil passage, and a third oil passage.
One ends of the second oil way and the third oil way are connected with a large-cavity oil way, the other ends of the second oil way and the third oil way are connected with an energy accumulator 4, one end of the first oil way is connected with a small-cavity oil way, and the other end of the first oil way is connected with an oil tank 1.
The first oil circuit is connected in series with a first control valve 5-1 with a one-way conduction position and a two-way conduction position, the second oil circuit is connected in series with a second control valve 5-2 with a one-way conduction position and a two-way conduction position, and the third oil circuit is connected in series with a one-way valve 5-3.
An oil port A of the multi-way valve 3 is connected with the small-cavity oil way, an oil port B of the multi-way valve is connected with the large-cavity oil way, an oil port P of the multi-way valve is connected with the main pump 2, and an oil port T of the multi-way valve is connected with the oil tank 1.
The main pump 2 is a variable displacement pump. The first control valve 5-1 and the second control valve 5-2 are both one-way stop solenoid valves, and the working positions are switched by electric signals.
Since the third oil passage is provided with the check valve 5-3, the passage for supplying oil to the accumulator 4 is normally open.
In one embodiment, a constant flow valve 5-4 is connected in series in the third oil path, and the constant flow valve 5-4 is a hydraulic control throttling valve capable of maintaining the flow rate of the pressure oil in the oil path. The constant flow valve 5-4 can avoid damage to the energy accumulator 4 caused by overlarge flow or overlarge fluctuation when the third oil way supplies oil to the energy accumulator 4, prolong the service life of the energy accumulator 4 and avoid influencing the lifting speed of the movable arm oil cylinder 6.
In one embodiment, the accumulator 4 is connected with the oil tank 1 through a buffer valve 5-5, the buffer valve 5-5 is a relief valve, and the opening pressure of the buffer valve 5-5 is smaller than the maximum pressure of the accumulator 4. In the working process of the movable arm, when the system pressure is overlarge, pressure oil output by the main pump 2 can be directly unloaded through the buffer valves 5-5, so that high-pressure oil enters the oil tank 1, and the energy accumulator 4 is prevented from being damaged.
In one embodiment, the first control valve 5-1, the second control valve 5-2, the check valve 5-3, the constant flow valve 5-4, and the trim valve 5-5 are integrated into a valve stack 5. The valve group 5 is provided with an oil port a, an oil port b, an oil port c and an oil port d, one end of the first oil path is connected with the oil port c, the other end of the first oil path is connected with the oil port d, one ends of the second oil path and the third oil path are connected with the oil port a, and the other ends of the second oil path and the third oil path are connected with the oil port b.
The first control valve 5-1 is in a one-way conduction position after power failure, the direction from the oil port d to the oil port c is conducted at the moment, the reverse direction is closed, the first control valve 5-1 is in a two-way conduction position after power is obtained, and the oil port c and the oil port d are conducted in two ways at the moment. Similarly, the second control valve 5-2 is in the one-way conduction position after being de-energized, the direction from the oil port b to the oil port a is conducted at the moment, the direction from the oil port b to the oil port a is closed in the opposite direction, the second control valve 5-2 is in the two-way conduction position after being energized, and the oil port a and the oil port b are in two-way conduction at the moment.
The working device buffer system has three working states, which respectively correspond to a lifting state of a boom, a maintenance state of the boom, and a falling state of the boom in the working device.
In one embodiment, the work equipment is an excavator, a loader, an aerial lift truck, a crane, or the like having a boom.
The working process and principle of the invention are as follows:
as shown in fig. 2, when the working device buffering system is in the first working state, corresponding to the process that the boom cylinder 6 drives the boom to lift, the first control valve 5-1 and the second control valve 5-2 are both de-energized, and the reversing valve in the multi-way valve 3 is energized. At the moment, the oil port A is communicated with the oil port T, and the oil port P is communicated with the oil port B; the path for supplying oil to the rodless cavity of the movable arm oil cylinder 6 in the large-cavity oil circuit is communicated, the path for supplying oil to the rod cavity of the movable arm oil cylinder 6 in the small-cavity oil circuit is communicated, the path for supplying oil to the energy accumulator 4 in the second oil circuit is communicated, and the path for supplying oil to the oil tank 1 in the first oil circuit is communicated.
The pressure oil output by the main pump 2 is divided into two paths after sequentially passing through an oil port P and an oil port B, one path directly enters a rodless cavity of the movable arm oil cylinder 6 through a large-cavity oil path to drive a piston rod to be pushed out to lift the movable arm, and the other path sequentially passes through an oil port a, a third oil path and an oil port B and then enters the energy accumulator 4. Since the large-chamber oil passage and the third oil passage are communicated, the rodless chamber pressure of the boom cylinder 6 and the pressure in the accumulator 4 are almost different.
As shown in fig. 3, when the working device buffering system is in the second working state, corresponding to the process of maintaining the boom, the first control valve 5-1 and the second control valve 5-2 are both powered on, and the reversing valve in the multi-way valve 3 is powered off. At this time, the oil port a, the oil port T, the oil port P, and the oil port B are not communicated with each other, a path for supplying oil to the rodless cavity of the boom cylinder 6 in the large-cavity oil path is closed, a path for supplying oil from the rod cavity of the boom cylinder 6 in the small-cavity oil path is closed, the second oil path is bidirectionally communicated, and the first oil path is bidirectionally communicated.
In this state, since the pressure difference between the accumulator 4 and the rodless chamber of the boom cylinder 6 is almost zero, when the first operating state is switched to the second operating state, no oil cross occurs in the system oil passage, and the operating device can be maintained in a stable state.
As shown in fig. 4, when the working device buffering system is in the third working state, corresponding to the process of the falling of the movable arm, the first control valve 5-1 and the second control valve 5-2 are all de-energized, and the reversing valve in the multi-way valve 3 is de-energized. At the moment, the oil port B is communicated with the oil port T, a path for supplying oil to the rodless cavity of the movable arm oil cylinder 6 in the large cavity oil circuit is communicated, a path for supplying oil to the rod cavity of the movable arm oil cylinder 6 in the small cavity oil circuit is communicated, a path for supplying oil to the energy accumulator 4 in the second oil circuit is communicated, and a path for supplying oil to the oil tank 1 in the first oil circuit is communicated.
The pressure oil in the rodless cavity sequentially passes through the large cavity oil way, the oil port B and the oil port T to return to the oil tank 1, and similarly, the pressure oil in the energy accumulator 4 also sequentially passes through the oil port B, the second oil way and the oil port a to enter the large cavity oil way to return together. Meanwhile, pressure oil in the oil tank 1 enters a rod cavity of the boom cylinder 6 through the oil port d, the first oil path, the oil port c and the small cavity oil path, so that the retraction of a piston rod in the boom cylinder 6 is realized. Therefore, the pressure in the energy accumulator 4 is only equal to the pressure of the rodless cavity of the movable arm oil cylinder 6 during next lifting, the influence of residual pressure in the energy accumulator 4 on the movable arm oil cylinder 6 can be effectively avoided, and after the loading of the loading device is finished, a running buffer system is started to ensure that no impact is generated on the loading device.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a work device buffer system, includes the big chamber oil circuit that connects the rodless chamber of swing arm hydro-cylinder (6) and connects the loculus oil circuit that has the pole chamber of swing arm hydro-cylinder (6), its characterized in that: the oil pump comprises an energy accumulator (4), a first oil way, a second oil way and a third oil way;
one end of the second oil way and one end of the third oil way are both connected with the large-cavity oil way, the other ends of the second oil way and the third oil way are both connected with the energy accumulator (4), one end of the first oil way is connected with the small-cavity oil way, and the other end of the first oil way is connected with the oil tank (1);
the path of the third oil path for supplying oil to the accumulator (4) is communicated;
when the working device buffer system is in a first working state, a path for supplying oil to a rodless cavity of the movable arm oil cylinder (6) in the large cavity oil way is communicated, a path for supplying oil to a rod cavity of the movable arm oil cylinder (6) in the small cavity oil way is communicated, a path for supplying oil to the second oil way by the energy accumulator (4) is communicated, and a path for supplying oil to the first oil way by the oil tank (1) is communicated.
2. A work device buffering system according to claim 1, wherein:
when the working device buffer system is in a second working state, a path for supplying oil to a rodless cavity of the movable arm oil cylinder (6) in the large cavity oil way is closed, a path for supplying oil to a rod cavity of the movable arm oil cylinder (6) in the small cavity oil way is closed, the second oil way is conducted in a two-way mode, and the first oil way is conducted in a two-way mode.
3. A work device buffering system according to claim 2, wherein:
and when the working device buffer system is in a third working state, a path for supplying oil to the rodless cavity of the movable arm oil cylinder (6) in the large cavity oil way is communicated, a path for supplying oil to the rod cavity of the movable arm oil cylinder (6) in the small cavity oil way is communicated, a path for supplying oil to the second oil way by the energy accumulator (4) is communicated, and a path for supplying oil to the first oil way by the oil tank (1) is communicated.
4. A work device buffering system according to any one of claims 1 to 3, wherein:
the first oil way is connected with a first control valve (5-1) with a one-way conduction position and a two-way conduction position in series, the second oil way is connected with a second control valve (5-2) with a one-way conduction position and a two-way conduction position in series, and the third oil way is connected with a one-way valve (5-3) in series.
5. The work apparatus buffer system according to claim 4, wherein:
and a constant flow valve (5-4) is connected in series in the third oil way.
6. The work apparatus buffer system according to claim 5, wherein:
the energy accumulator (4) is connected with the oil tank (1) through a buffer valve (5-5), and the opening pressure of the buffer valve (5-5) is smaller than the maximum pressure of the energy accumulator (4).
7. The work apparatus buffer system according to claim 6, wherein:
the first control valve (5-1), the second control valve (5-2), the one-way valve (5-3), the constant flow valve (5-4) and the buffer valve (5-5) are integrated into a valve group (5).
8. A work device buffering system according to claim 3, wherein:
the multi-way valve (3) is also included, an oil port A of the multi-way valve (3) is connected with the small-cavity oil way, an oil port B of the multi-way valve is connected with the large-cavity oil way, an oil port P of the multi-way valve is connected with the main pump (2), and an oil port T of the multi-way valve is connected with the oil tank (1);
the working device buffer system is in a first working state, the oil port A is communicated with the oil port T, and the oil port P is communicated with the oil port B;
the working device buffer system is in a second working state, and the oil port A, the oil port T, the oil port P and the oil port B are not communicated with each other;
and the working device buffer system is in a third working state, and the oil port B is communicated with the oil port T.
9. A work device buffering system according to claim 3, wherein:
the first working state corresponds to a lifting state of a boom in the working device, the second working state corresponds to a maintaining state of the boom in the working device, and the third working state corresponds to a falling state of the boom in the working device.
10. A construction apparatus including a working device having a boom and a control system that drives the boom, characterized in that: the control system is a work implement buffering system as claimed in claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922089381.6U CN211774100U (en) | 2019-11-28 | 2019-11-28 | Working device buffer system and engineering equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922089381.6U CN211774100U (en) | 2019-11-28 | 2019-11-28 | Working device buffer system and engineering equipment |
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| CN211774100U true CN211774100U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110894731A (en) * | 2019-11-28 | 2020-03-20 | 徐工集团工程机械股份有限公司 | Working device buffer system and engineering equipment |
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2019
- 2019-11-28 CN CN201922089381.6U patent/CN211774100U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110894731A (en) * | 2019-11-28 | 2020-03-20 | 徐工集团工程机械股份有限公司 | Working device buffer system and engineering equipment |
| CN110894731B (en) * | 2019-11-28 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Working device buffer system and engineering equipment |
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