CN216508300U - Hydraulic braking system and road roller - Google Patents
Hydraulic braking system and road roller Download PDFInfo
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- CN216508300U CN216508300U CN202121474708.2U CN202121474708U CN216508300U CN 216508300 U CN216508300 U CN 216508300U CN 202121474708 U CN202121474708 U CN 202121474708U CN 216508300 U CN216508300 U CN 216508300U
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Abstract
The utility model relates to the technical field of engineering machinery, in particular to a hydraulic braking system and a road roller. The hydraulic brake system comprises an emergency stop switch, an oil driving element, an emergency stop brake valve and a brake drum, wherein the inlet of the emergency stop brake valve is connected with the oil driving element, the outlet of the emergency stop brake valve is connected with the brake drum, the emergency stop brake valve is a proportional reversing valve, and the emergency stop switch is connected with the emergency stop brake valve. During emergency braking, the valve core of the emergency braking valve is reversed only by pressing the emergency stop switch, the oil driving element can send pressure oil to the brake drum through the emergency braking valve, and the emergency braking is realized through the brake drum; the system can be convenient for a driver or a safety worker to timely react, and the engineering machinery can be stopped in time under the emergency condition. The hydraulic braking system provided by the utility model can reduce pressure impact caused by reversing the valve core, reduce the shaking degree of a vehicle body during parking and braking on a ramp, and avoid rollover of an engineering vehicle.
Description
Technical Field
The utility model relates to the technical field of engineering machinery, in particular to a hydraulic braking system and a road roller.
Background
In the construction process of the engineering machinery, when an obstacle or an emergency occurs, emergency braking is needed, and the braking distance is required to be short. However, the emergency braking effect of the existing engineering vehicle is not ideal, and particularly for slope parking, the vehicle body is easy to shake greatly during braking, and even the engineering vehicle turns over.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving or improving at least one of the above technical problems.
In order to solve the problems, the utility model provides a hydraulic brake system which comprises an emergency stop switch, an oil driving element, an emergency stop brake valve and a brake drum, wherein an inlet of the emergency stop brake valve is connected with the oil driving element, an outlet of the emergency stop brake valve is connected with the brake drum, the emergency stop brake valve is a proportional reversing valve, and the emergency stop switch is connected with the emergency stop brake valve.
Optionally, the hydraulic brake system further comprises a service brake valve, an inlet of the service brake valve is connected to the oil drive element, and an outlet of the service brake valve is connected to the brake drum.
Optionally, the emergency stop brake valve includes a first channel through which the service brake valve is connected to the brake drum and a second channel through which the emergency stop brake valve is connected to the brake drum.
Optionally, there are at least two service brake valves, all of which are connected in parallel between the oil drive member and the brake drum.
Optionally, the hydraulic brake system further comprises a shuttle valve, the shuttle valve comprises at least two inlets, each of the service brake valves is respectively connected with each inlet of the shuttle valve, and an outlet of the shuttle valve is connected with the emergency stop brake valve.
Optionally, the hydraulic brake system further comprises an oil tank and an accumulator, an inlet of the oil driving element is connected with the oil tank, and an outlet of the oil driving element is connected with the accumulator.
Optionally, the hydraulic braking system further comprises a charge valve located between the oil drive element and the accumulator.
Optionally, an oil discharge port of the liquid charging valve, the emergency stop brake valve or the foot brake valve is connected with the oil tank.
Optionally, the hydraulic brake system further comprises a controller electrically connected to the emergency stop brake valve and the emergency stop switch, respectively.
Compared with the prior art, the hydraulic braking system has the beneficial effects that:
when the emergency brake is carried out, only the emergency stop switch is pressed to change the valve core of the emergency stop brake valve, the oil driving element can send pressure oil to the brake drum through the emergency stop brake valve, and the emergency brake is realized through the brake drum; the emergency stop switch is arranged, so that a driver or a safety worker can respond in time, and the engineering machinery can be stopped in time under emergency. In addition, the hydraulic brake system provided by the utility model is more stable in reversing, can reduce pressure impact caused by reversing of the valve core, reduces the shaking degree of a vehicle body during ramp parking braking, and avoids the rollover of an engineering vehicle.
The utility model also provides a road roller comprising the hydraulic brake system. The road roller has the same beneficial effects as the hydraulic braking system, and the details are not repeated.
Drawings
Fig. 1 is a schematic diagram of a hydraulic brake system in an embodiment of the present invention.
Description of reference numerals:
1-shuttle valve, 2-emergency stop brake valve, 3-service brake valve, 4-brake drum, 5-accumulator, 6-controller, 7-emergency stop switch, 8-liquid charging valve, 9-oil driving element and 10-oil tank.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the terms "an embodiment," "one embodiment," and "an implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or example implementation of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.
An embodiment of the present invention provides a hydraulic brake system, as shown in fig. 1, including an emergency stop switch 7, an oil driving element 9, an emergency stop brake valve 2 and a brake drum 4, an inlet of the emergency stop brake valve 2 is connected to the oil driving element 9, an outlet of the emergency stop brake valve 2 is connected to the brake drum 4, the emergency stop brake valve 2 is a proportional directional valve, and the emergency stop switch 7 is connected to the emergency stop brake valve 2.
That is, the oil drive element 9, the emergency brake valve 2 and the brake drum 4 are connected in sequence, and the oil drive element 9 may be connected to an oil tank 10. Here, the oil driving element 9 may be a hydraulic pump or a liquid propeller, and may specifically be a gear pump, but of course, the oil driving element 9 may also be another energy storage device. A proportional valve spool is arranged in the emergency braking valve 2, namely the spool of the emergency braking valve 2 can adopt a proportional valve spool, the working principle of the spool of the proportional valve is the same as that of the spool of the proportional reversing valve, and in an emergency situation, the emergency braking valve 2 is adopted to control the hydraulic oil flowing into the brake drum 4, so that the emergency braking is realized. The proportional reversing valve can be an electromagnetic proportional valve, an electro-hydraulic proportional valve or an electric proportional valve.
The hydraulic brake system further comprises a controller, wherein the controller is respectively electrically connected with the emergency stop brake valve 2 and the emergency stop switch 7, so that when a driving signal from the emergency stop switch 7 is received, a calibration curve output control signal is sent to the emergency stop brake valve 2. When emergency braking is performed, the oil driving element 9 drives pressure oil to move, liquid is filled into the emergency stop brake valve 2, the proportional valve core is reversed, the controller 6 can open the emergency stop brake valve 2 according to a preset proportional curve, the proportional valve core is reversed according to a preset proportion, and hydraulic oil flows to the brake drum 4. Therefore, the controller 6 can control the emergency stop brake valve 2 to stably reverse according to a preset proportional curve, so that vehicle body shaking caused by emergency stop on a ramp can be reduced, and emergency braking of the engineering vehicle is realized.
In an embodiment, when an obstacle, a pit or a pedestrian is detected in a preset distance in front in an image recognition mode, the speed of the engineering vehicle is higher, at the moment, the emergency braking system is automatically started, and the emergency braking valve 2 is automatically opened, so that hydraulic oil flows to the brake drum 4 for braking. In one embodiment, the emergency braking system may be activated by an emergency stop switch 7, and when the emergency stop switch 7 is energized, the emergency stop brake valve 2 is opened to reverse the spool of the emergency stop brake valve 2, so that hydraulic oil flows to the brake drum 4 for braking.
Here, the emergency stop switch 7 may be a button built in the cab of the construction machine, or may be a button on a remote controller, in a normal construction state of the construction machine, the emergency stop brake valve 2 is in a power-off state, when the emergency stop switch 7 is pressed, a proportional valve spool of the emergency stop brake valve 2 is reversed, and the oil driving element 9 drives the pressurized oil to flow to the brake drum 4 through the emergency stop brake valve 2, so that the brake drum 4 brakes the construction machine. Through the setting of scram switch 7, can be convenient for driver or the security personnel in time to react, only need press scram switch 7 can realize emergency braking, make engineering machine tool in time park under emergency.
Thus, by providing the emergency brake valve 2, the oil drive member 9 can send pressure oil to the brake drum 4 through the emergency brake valve 2 by opening the emergency brake valve 2 at the time of emergency braking, and emergency braking is achieved by the brake drum 4. In addition, through the setting of emergency stop brake valve 2, proportional valve case switching-over is more steady, can reduce the pressure impact that the case switching-over caused, reduces the shake degree of automobile body when ramp parking braking, avoids the engineering vehicle to turn on one's side.
As shown in fig. 1, the hydraulic brake system further includes a service brake valve 3, an inlet of the service brake valve 3 is connected to the oil driving member 9, and an outlet of the service brake valve 3 is connected to the brake drum 4.
It can also be said that the hydraulic brake system includes two brake systems: one is a brake system which brakes by foot, namely, a valve core of the foot brake valve 3 is reversed by stepping on the brake, and the oil driving element 9 drives pressure oil to flow to the brake drum 4 after passing through the foot brake valve 3, so that the brake drum 4 brakes the engineering machinery; the other is an emergency stop system, the proportional valve spool of the emergency stop brake valve 2 is reversed by opening the emergency stop switch 7, and the oil driving element 9 drives the pressurized oil to flow to the brake drum 4 after passing through the emergency stop brake valve 2, so that the brake drum 4 brakes the engineering machinery. The foot brake valve 3 and the emergency stop brake valve 2 are respectively connected with the brake drum 4, so that the engineering machinery is respectively braked under different conditions.
As shown in fig. 1, the emergency stop brake valve 2 includes a first passage through which the service brake valve 3 is adapted to be connected with the brake drum 4 and a second passage through which the emergency stop brake valve 2 is adapted to be connected with the brake drum 4.
That is to say, the valve core of the emergency brake valve 2 is suitable for reversing to block the first channel or the second channel, under the normal construction state of the engineering machinery, the emergency brake valve 2 is powered off, the valve core of the emergency brake valve 2 blocks the second channel, and the foot brake valve 3 is suitable for being connected with the brake drum 4 through the first channel. When a foot brake is adopted for braking, a valve core of the foot brake valve 3 is reversed, the foot brake valve 3 is connected with the brake drum 4 through the emergency stop brake valve 2, and the oil driving element 9 drives pressure oil to flow to the brake drum 4 after passing through the foot brake valve 3, so that the brake drum 4 brakes the engineering machinery; when emergency braking is adopted, the emergency braking valve 2 is electrified, a proportional valve spool of the emergency braking valve 2 is reversed, the spool of the emergency braking valve 2 blocks the first channel, the emergency braking valve 2 is suitable for being connected with the brake drum 4 through the second channel, and the oil driving element 9 drives pressure oil to flow to the brake drum 4 after passing through the emergency braking valve 2, so that the brake drum 4 brakes the engineering machinery.
That is, the service brake valve 3 does not need to be separately connected to the brake drum 4 through a pipeline, and can be connected to the brake drum 4 through a pipeline shared with the emergency stop brake valve 2, so that excessive oil loss in an oil path caused by connecting another pipeline to the brake drum 4 can be avoided, and waste of the pipeline can also be avoided.
Alternatively, the service brake valve 3 and the emergency brake valve 2 may be connected to the brake drum 4 by a three-way pipe, i.e. three ends of the three-way pipe are connected to the outlet of the service brake valve 3, the outlet of the emergency brake valve 2 and the inlet of the brake drum 4, respectively.
As shown in fig. 1, there are at least two service brake valves 3, and all of the service brake valves 3 are connected in parallel between the oil driving member 9 and the brake drum 4. That is, the number of the service brake valves 3 may be two or more, and the inlets of all the service brake valves 3 are respectively connected with the outlets of the oil driving element 9, specifically, the inlets of all the service brake valves 3 may be connected with the outlets of the oil driving element 9 through an adapter; the outlets of all the service brake valves 3 are respectively connected with the brake drum 4, specifically, the outlets of all the service brake valves 3 may be connected with the brake drum 4 through a switching member that turns one more, or may be connected with the brake drum 4 through a valve.
From this, through oil drive element 9 with connect in parallel two at least between the brake drum 4 service brake valve 3, when the foot trample brake, at least one service brake valve 3 switching-over, oil drive element 9 drives pressure oil to all respectively service brake valve 3, when one of them service brake valve 3 damages, other service brake valve 3 still can continue to work, can avoid the malfunctioning phenomenon of braking system to take place.
As shown in fig. 1, the hydraulic brake system further includes a shuttle valve 1, the shuttle valve 1 includes at least two inlets, each service brake valve 3 is connected to each inlet of the shuttle valve 1, and an outlet of the shuttle valve 1 is connected to the emergency stop brake valve 2. That is, the shuttle valve 1 has a plurality of inlets, the number of inlets corresponds to the number of the service brake valves 3, the outlet of the shuttle valve 1 is connected to the brake drum 4, when the outlet pressures of the different service brake valves 3 are different, the shuttle valve 1 selects the path with the highest opening pressure, the outlet of the service brake valve 3 with the highest pressure is connected to the brake drum 4, and the outlets of the other service brake valves 3 are closed; when the outlet pressure of the different foot brake valves 3 is the same, but the sequence of the pressure oil flowing to the shuttle valve 1 is different, the shuttle valve 1 opens one path of the pressure oil which flows into the shuttle valve 1 firstly, so that the outlet of the foot brake valve 3 is connected with the brake drum 4, and the outlets of the other foot brake valves 3 are closed. Through the use of the shuttle valve 1, when a brake is stepped on by feet, only one path of the foot brake valve 3 is communicated.
As shown in fig. 1, the hydraulic brake system further comprises a tank 10 and an accumulator 5, an inlet of the oil driving element 9 is connected to the tank 10, an outlet of the oil driving element 9 is connected to the accumulator 5, and the accumulator 5 is adapted to charge the emergency brake valve 2 or the foot brake valve 3. The oil driving element 9 is a gear pump, that is, the oil driving element 9 charges the accumulator 5 in advance, and when the service brake or the emergency brake is performed, the accumulator 5 directly supplies liquid to the emergency brake valve 2 or the service brake valve 3.
As shown in fig. 1, the hydraulic braking system further comprises a charge valve 8, said charge valve 8 being located between said oil driving element 9 and said accumulator 5, said charge valve 8 being adapted to close when the pressure of said accumulator 5 is equal to a preset pressure. In the construction process of the engineering machinery, the charging valve 8 may set a preset pressure, and when it is detected that the pressure of the pressurized oil in the accumulator 5 is lower than the preset pressure of the charging valve 8, the charging valve 8 is reversed, and the oil driving element 9 drives the pressurized oil to charge the accumulator 5; when the pressure of the pressure oil in the accumulator 5 is detected to be equal to the preset pressure of the charging valve 8, the charging valve 8 is reversed again, so that the valve core is reset.
As shown in fig. 1, the oil discharge port of the charging valve 8, the emergency stop brake valve 2 or the foot brake valve 3 is connected to the oil tank 10. When the pressure of the pressure oil in the energy accumulator 5 is detected to be equal to the pre-opening pressure of the charging valve 8, the charging valve 8 is reversed again, the oil driving element 9 stops working, and the charging valve 8 can send the oil to the oil tank 10 through an oil discharge port to release the pressure of the charging valve 8; oil discharge ports of a plurality of the foot brake valves 3 can be commonly connected to the same oil discharge pipe, and return oil to the oil tank 10 through the oil discharge pipe; an oil discharge port of the emergency stop brake valve 2 can be connected with the oil tank 10 through a pipeline, and when the oil discharge port of the emergency stop brake valve 2 is opened, oil in the emergency stop brake valve 2 flows back to the oil tank 10.
As shown in fig. 1, the hydraulic brake system further includes a pressure detecting element mounted on the brake drum 4, the pressure detecting element being adapted to detect a pressure at an inlet of the brake drum 4. Here, a main line is connected to an inlet of the brake drum 4, the emergency brake valve 2 is connected to the brake drum 4 via the main line, and the pressure detection element is disposed on the main line.
The present embodiment provides a road roller including a hydraulic braking system as described above. The road roller has the same beneficial effects as the hydraulic braking system, and the details are not repeated.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications are intended to fall within the scope of the utility model.
Claims (10)
1. A hydraulic brake system is characterized by comprising an emergency stop switch (7), an oil driving element (9), an emergency stop brake valve (2) and a brake drum (4), wherein an inlet of the emergency stop brake valve (2) is connected with the oil driving element (9), an outlet of the emergency stop brake valve (2) is connected with the brake drum (4), the emergency stop brake valve (2) is a proportional reversing valve, and the emergency stop switch (7) is connected with the emergency stop brake valve (2).
2. A hydraulic brake system according to claim 1, further comprising a service brake valve (3), an inlet of the service brake valve (3) being connected to the oil drive element (9), an outlet of the service brake valve (3) being connected to the brake drum (4).
3. A hydraulic brake system according to claim 2, wherein the emergency stop brake valve (2) comprises a first channel through which the service brake valve (3) is connected with the brake drum (4) and a second channel through which the emergency stop brake valve (2) is connected with the brake drum (4).
4. A hydraulic brake system according to claim 2, wherein there are at least two service brake valves (3), all service brake valves (3) being connected in parallel between the oil drive member (9) and the brake drum (4).
5. A hydraulic brake system according to claim 4, further comprising a shuttle valve (1), the shuttle valve (1) comprising at least two inlets, each service brake valve (3) being connected to a respective inlet of the shuttle valve (1), an outlet of the shuttle valve (1) being connected to the emergency brake valve (2).
6. A hydraulic brake system according to claim 2, further comprising a reservoir (10) and an accumulator (5), an inlet of the oil drive element (9) being connected to the reservoir (10), and an outlet of the oil drive element (9) being connected to the accumulator (5).
7. A hydraulic braking system according to claim 6, characterized by further comprising a charging valve (8), the charging valve (8) being located between the oil drive element (9) and the accumulator (5).
8. The hydraulic brake system according to claim 7, characterized in that the oil discharge port of the charging valve (8), the emergency brake valve (2) or the foot brake valve (3) is connected to the oil tank (10).
9. The hydraulic brake system of claim 1, further comprising a controller electrically connected to the emergency stop brake valve (2) and the emergency stop switch (7), respectively.
10. A soil compactor comprising a hydraulic braking system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474708.2U CN216508300U (en) | 2021-06-30 | 2021-06-30 | Hydraulic braking system and road roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474708.2U CN216508300U (en) | 2021-06-30 | 2021-06-30 | Hydraulic braking system and road roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216508300U true CN216508300U (en) | 2022-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121474708.2U Active CN216508300U (en) | 2021-06-30 | 2021-06-30 | Hydraulic braking system and road roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216508300U (en) |
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2021
- 2021-06-30 CN CN202121474708.2U patent/CN216508300U/en active Active
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