CN218971527U - Hydraulic control system and working machine - Google Patents
Hydraulic control system and working machine Download PDFInfo
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- CN218971527U CN218971527U CN202320025280.6U CN202320025280U CN218971527U CN 218971527 U CN218971527 U CN 218971527U CN 202320025280 U CN202320025280 U CN 202320025280U CN 218971527 U CN218971527 U CN 218971527U
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Abstract
The utility model relates to the technical field of hydraulic systems, and provides a hydraulic control system and a working machine. In the hydraulic control system, a hydraulic pump is connected with a first support leg oil cylinder and a second support leg oil cylinder through a support leg oil cylinder control valve group. The displacement detection device is used for detecting the displacement of the first support leg oil cylinder and the second support leg oil cylinder. The control device is connected with the displacement detection device and the landing leg oil cylinder control valve group. The control device is used for controlling the opening degree of the landing leg oil cylinder control valve group based on the detection result of the displacement detection device. The hydraulic control system is provided with a control device and a displacement detection device, and the control device controls the opening of an oil port of the landing leg oil cylinder control valve group based on the detection result of the displacement detection device so as to enable the first landing leg oil cylinder and the second landing leg oil cylinder to achieve a synchronous telescopic state. Therefore, the synchronous expansion and contraction of the first support leg oil cylinder and the second support leg oil cylinder can be realized, and further, the operation flatness of the operation machinery can be improved.
Description
Technical Field
The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic control system and a working machine.
Background
The milling machine is one of the main models of asphalt pavement maintenance construction machinery, and is mainly used for excavating and renewing asphalt concrete surface layers of roads, town roads, airports, goods yards and the like. Currently, hydraulic systems are commonly used to control the elevation of the left and right legs of a milling machine. In the existing hydraulic system, the lifting synchronism of the left and right leg oil cylinders for driving the left and right legs to lift is poor, so that the milling flatness of the milling machine can be affected.
Disclosure of Invention
The utility model provides a hydraulic control system and a working machine, which are used for solving or improving the problems that in the existing hydraulic control system, the lifting synchronism of left and right leg cylinders for driving left and right legs to lift is poor, and the milling flatness of a milling machine is affected.
According to a first aspect of the present utility model, there is provided a hydraulic control system including a hydraulic pump, a leg cylinder control valve block, a first leg cylinder, a second leg cylinder, a displacement detection device, and a control device.
The hydraulic pump is connected with the first support leg oil cylinder and the second support leg oil cylinder through the support leg oil cylinder control valve group. The displacement detection device is used for detecting the displacement of the first support leg oil cylinder and the second support leg oil cylinder. And the control device is connected with the displacement detection device and the landing leg oil cylinder control valve group. The control device is used for controlling the opening degree of the landing leg oil cylinder control valve group based on the detection result of the displacement detection device so as to enable the first landing leg oil cylinder and the second landing leg oil cylinder to synchronously stretch and retract.
According to the hydraulic control system provided by the utility model, the landing leg oil cylinder control valve group comprises a first landing leg oil cylinder control valve and a second landing leg oil cylinder control valve. The displacement detection device comprises a first displacement sensor and a second displacement sensor.
The hydraulic pump is connected with the first support leg oil cylinder through the first support leg oil cylinder control valve. The hydraulic pump is connected with the second support leg oil cylinder through the second support leg oil cylinder control valve. The first displacement sensor is mounted to the first leg cylinder. The second displacement sensor is mounted to the second leg cylinder. The control device controls the opening degrees of the first support leg oil cylinder control valve and the second support leg oil cylinder control valve respectively based on detection results of the first displacement sensor and the second displacement sensor.
According to the hydraulic control system provided by the utility model, the first support leg oil cylinder control valve comprises a first extending position, a first stopping position and a first retracting position.
In the state of the first extension position, a rodless cavity of the first support leg oil cylinder is communicated with the hydraulic pump through the first support leg oil cylinder control valve, and a rod cavity of the first support leg oil cylinder is communicated with an oil tank through the first support leg oil cylinder control valve;
in the first contracted state, the rodless cavity of the first support leg oil cylinder is communicated with the oil tank through the first support leg oil cylinder control valve, and the rod cavity of the first support leg oil cylinder is communicated with the hydraulic pump through the first support leg oil cylinder control valve;
and in the state of the first stop position, the rodless cavity and the rod cavity of the first support leg oil cylinder are both stopped with the hydraulic pump.
According to the hydraulic control system provided by the utility model, the second support leg oil cylinder control valve comprises a second extending position, a second stopping position and a second retracting position.
In the second extending position state, the rodless cavity of the second supporting leg oil cylinder is communicated with the hydraulic pump through the second supporting leg oil cylinder control valve, and the rod cavity of the second supporting leg oil cylinder is communicated with the oil tank through the second supporting leg oil cylinder control valve;
in the second contracted state, the rodless cavity of the second support leg oil cylinder is communicated with the oil tank through the second support leg oil cylinder control valve, and the rod cavity of the second support leg oil cylinder is communicated with the hydraulic pump through the second support leg oil cylinder control valve;
and in the second stop position state, the rodless cavity and the rod cavity of the second support leg oil cylinder are both stopped with the hydraulic pump.
According to the hydraulic control system provided by the utility model, the hydraulic control system further comprises a main control valve. The main control valve comprises a main communication position and a main cut-off position. The control device is connected with the main control valve and is used for switching the working position of the main control valve.
An oil inlet of the main control valve is connected with the hydraulic pump, and an oil outlet of the main control valve is connected with the oil tank. In the state of the main communication position, an oil inlet of the main control valve is communicated with an oil outlet of the main control valve; and in the state of the main stop position, an oil inlet of the main control valve and an oil outlet of the main control valve are stopped.
According to the hydraulic control system provided by the utility model, the first hydraulic lock is arranged between the first support leg oil cylinder and the first support leg oil cylinder control valve. And a second hydraulic lock is arranged between the second support leg oil cylinder and the second support leg oil cylinder control valve.
According to the hydraulic control system provided by the utility model, the hydraulic system further comprises a speed detection device. The speed detection device is used for detecting the expansion speed of the first support leg oil cylinder and the second support leg oil cylinder. The control device is connected with the speed detection device. The control device is used for controlling the opening degrees of the first support leg oil cylinder control valve and the second support leg oil cylinder control valve respectively based on the detection result of the speed detection device.
According to the hydraulic control system provided by the utility model, the first support leg oil cylinder control valve, the second support leg oil cylinder control valve and the main control valve are all electromagnetic valves.
According to the hydraulic control system provided by the utility model, the hydraulic control system further comprises a safety valve. And an oil inlet of the safety valve is connected with the hydraulic pump. An oil outlet of the safety valve is connected with the oil tank, and an oil filter is arranged at the oil outlet of the hydraulic pump.
According to a second aspect of the present utility model there is provided a work machine comprising a hydraulic control system as described above.
In the hydraulic control system provided by the utility model, a first supporting leg and a second supporting leg are respectively arranged at two sides of a working machine. A first support leg oil cylinder is arranged in the first support leg, and a second support leg oil cylinder is arranged in the second support leg. The first support leg oil cylinder and the second support leg oil cylinder are respectively used for driving lifting actions of the first support leg and the second support leg.
The hydraulic pump is connected with the first support leg oil cylinder and the second support leg oil cylinder through the support leg oil cylinder control valve group so as to supply oil for the first support leg oil cylinder and the second support leg oil cylinder. The displacement detection device is connected with the first support leg oil cylinder and the second support leg oil cylinder, and can detect the telescopic displacement of the first support leg oil cylinder and the second support leg oil cylinder, and further, the lifting displacement of the first support leg and the second support leg can be reflected. The control device is connected with the displacement detection device and the support leg oil cylinder control valve group, the displacement detection device can feed back real-time displacement values of the first support leg oil cylinder and the second support leg oil cylinder detected by the displacement detection device to the control device, and the control device can control the opening degree of an oil port of the support leg oil cylinder control valve group based on the detection result of the displacement detection device so that the first support leg oil cylinder and the second support leg oil cylinder reach a synchronous telescopic state.
For example, in the working process, when the extension displacement value of the first support leg oil cylinder is larger than that of the second support leg oil cylinder, the control device adjusts the opening of the oil port of the support leg oil cylinder control valve group, so that hydraulic oil supplied to the first support leg oil cylinder by the hydraulic pump is reduced, and hydraulic oil supplied to the second support leg oil cylinder is increased, and therefore the extension speed of the first support leg oil cylinder is reduced, and the extension speed of the second support leg oil cylinder is increased until the first support leg oil cylinder and the second support leg oil cylinder reach a synchronous extension state.
Through the structure, the control device and the displacement detection device are arranged in the hydraulic control system, and the control device controls the opening of the oil port of the landing leg oil cylinder control valve group based on the detection result of the displacement detection device, so that the first landing leg oil cylinder and the second landing leg oil cylinder reach a synchronous telescopic state. Therefore, the synchronous expansion and contraction of the first support leg oil cylinder and the second support leg oil cylinder can be realized, and further, the operation flatness of the operation machinery can be improved.
Further, since the work machine includes the hydraulic control system as described above, it also has the advantages as described above.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic system diagram of a hydraulic control system provided by the present utility model;
reference numerals:
100. a hydraulic pump; 200. the landing leg oil cylinder controls the valve group; 210. a first leg cylinder control valve; 211. a first extension; 212. a first constriction; 213. a first cut-off bit; 220. a second leg cylinder control valve; 221. a second extended position; 222. a second constriction; 223. a second cut-off bit; 300. a first leg cylinder; 400. a second leg cylinder; 500. an oil tank; 600. a main control valve; 601. a main communication position; 602. a main cut-off bit; 701. a first hydraulic lock; 702. a second hydraulic lock; 800. a safety valve; 900. an oil filter.
Detailed Description
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.
In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.
In embodiments of the utility model, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples, as well as features of various embodiments or examples, described in this specification may be combined and combined to further clarify the objects, aspects and advantages of embodiments of the present utility model, without departing from the spirit and scope of the utility model, and it should be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
A hydraulic control system and a working machine according to an embodiment of the present utility model are described below with reference to fig. 1. It should be understood that the following description is only illustrative of the embodiments of the utility model and is not intended to limit the utility model in any way.
An embodiment of the first aspect of the present utility model provides a hydraulic control system, as shown in fig. 1, which includes a hydraulic pump 100, a leg cylinder control valve group 200, a first leg cylinder 300, a second leg cylinder 400, a displacement detection device, and a control device.
Wherein the hydraulic pump 100 is connected with the first and second leg cylinders 300 and 400 through the leg cylinder control valve group 200. The displacement detecting means is for detecting the displacement of the first and second leg cylinders 300 and 400. The control device is connected with the displacement detection device and the landing leg oil cylinder control valve group 200. The control device is used for controlling the opening degree of the support leg oil cylinder control valve group 200 based on the detection result of the displacement detection device so as to enable the first support leg oil cylinder 300 and the second support leg oil cylinder 400 to synchronously stretch and retract.
In the hydraulic control system provided by the utility model, a first supporting leg and a second supporting leg are respectively arranged at two sides of a working machine. A first leg cylinder 300 is installed in the first leg, and a second leg cylinder 400 is installed in the second leg. The first and second leg cylinders 300 and 400 are used to drive the lifting motions of the first and second legs, respectively.
The hydraulic pump 100 is connected to the first and second leg cylinders 300 and 400 through the leg cylinder control valve group 200 to supply oil to the first and second leg cylinders 300 and 400. The displacement detecting device is connected with the first leg cylinder 300 and the second leg cylinder 400, and can detect the telescopic displacement of the first leg cylinder 300 and the second leg cylinder 400, and further, can reflect the lifting displacement of the first leg and the second leg. The control device is connected with the displacement detection device and the support leg oil cylinder control valve bank 200, the displacement detection device can feed back the real-time displacement values of the first support leg oil cylinder 300 and the second support leg oil cylinder 400 detected by the displacement detection device to the control device, and the control device can control the opening degree of an oil port of the support leg oil cylinder control valve bank 200 based on the detection result of the displacement detection device so as to enable the first support leg oil cylinder 300 and the second support leg oil cylinder 400 to achieve a synchronous telescopic state.
For example, in the operation, when the extension displacement value of the first leg cylinder 300 is greater than the extension displacement value of the second leg cylinder 400, the control device adjusts the opening degree of the oil port of the leg cylinder control valve group 200 so that the hydraulic oil supplied from the hydraulic pump 100 to the first leg cylinder 300 is reduced and the hydraulic oil supplied to the second leg cylinder 400 is increased, whereby the extension speed of the first leg cylinder 300 is reduced and the extension speed of the second leg cylinder 400 is increased until the first leg cylinder 300 and the second leg cylinder 400 reach a state of synchronous extension.
With this structural arrangement, a control device and a displacement detection device are provided in the hydraulic control system, and the control device is caused to control the opening degree of the oil port of the leg cylinder control valve group 200 based on the detection result of the displacement detection device, so that the first leg cylinder 300 and the second leg cylinder 400 reach a state of synchronous expansion and contraction. Thus, the first leg cylinder 300 and the second leg cylinder 400 can be synchronously extended and contracted, and further, the flatness of the work machine work can be improved.
In one embodiment of the present utility model, the leg cylinder control valve block 200 includes a first leg cylinder control valve 210 and a second leg cylinder control valve 220. The displacement detection device comprises a first displacement sensor and a second displacement sensor.
Wherein the hydraulic pump 100 is connected to the first leg cylinder 300 through the first leg cylinder control valve 210. The hydraulic pump 100 is connected to the second leg cylinder 400 through the second leg cylinder control valve 220. The first displacement sensor is mounted to the first leg cylinder 300. The second displacement sensor is mounted to the second leg cylinder 400. The control means controls the opening degrees of the first leg cylinder control valve 210 and the second leg cylinder control valve 220, respectively, based on the detection results of the first displacement sensor and the second displacement sensor.
In one embodiment of the present utility model, the first leg cylinder control valve 210 includes a first extension position 211, a first shut-off position 213, and a first retraction position 212.
In the state of the first extension position 211, the rodless chamber of the first leg cylinder 300 is communicated with the hydraulic pump 100 through the first leg cylinder control valve 210, and the rod chamber of the first leg cylinder 300 is communicated with the oil tank 500 through the first leg cylinder control valve 210;
in the state of the first contracted position 212, the rodless cavity of the first leg cylinder 300 is communicated with the oil tank 500 through the first leg cylinder control valve 210, and the rod cavity of the first leg cylinder 300 is communicated with the hydraulic pump 100 through the first leg cylinder control valve 210;
in the state of the first cutoff position 213, both the rodless chamber and the rod-containing chamber of the first leg cylinder 300 are cutoff from the hydraulic pump 100.
Further, in one embodiment of the present utility model, the second leg cylinder control valve 220 includes a second extension position 221, a second shut-off position 223, and a second retraction position 222.
In the state of the second extension position 221, the rodless chamber of the second leg cylinder 400 communicates with the hydraulic pump 100 through the second leg cylinder control valve 220, and the rod chamber of the second leg cylinder 400 communicates with the oil tank 500 through the second leg cylinder control valve 220;
in the state of the second constriction 222, the rodless cavity of the second leg cylinder 400 communicates with the oil tank 500 through the second leg cylinder control valve 220, and the rod cavity of the second leg cylinder 400 communicates with the hydraulic pump 100 through the second leg cylinder control valve 220;
in the state of the second cutoff position 223, both the rodless chamber and the rod-containing chamber of the second leg cylinder 400 are cutoff from the hydraulic pump 100.
In yet another embodiment of the present utility model, the first leg cylinder control valve 210 and the second leg cylinder control valve 220 are both solenoid valves.
For example, as shown in fig. 1, in this embodiment, the first leg cylinder control valve 210 is a first three-position four-way solenoid directional valve. The first three-position four-way electromagnetic directional valve comprises a first working oil port, a second working oil port, a third working oil port and a fourth working oil port. The first working oil port is connected with the hydraulic pump 100, the second working oil port is connected with the oil tank 500, the third working oil port is connected with the rodless cavity of the first support leg oil cylinder 300, and the fourth working oil port is connected with the rod cavity of the first support leg oil cylinder 300. The control device is connected with the first three-position four-way electromagnetic reversing valve, and can switch the working position of the first three-position four-way electromagnetic valve and control the opening of an oil port when the first three-position four-way electromagnetic valve is in different working positions.
When the first three-position four-way electromagnetic directional valve is switched to the first extending position 211, the first working oil port is communicated with the third working oil port, the second working oil port is communicated with the fourth working oil port, the hydraulic pump 100 supplies oil for the rodless cavity of the first supporting leg oil cylinder 300, and the oil in the rod cavity of the first supporting leg oil cylinder 300 flows back into the oil tank 500.
When the first three-position four-way electromagnetic directional valve is switched to the first contraction position 212, the first working oil port is communicated with the fourth working oil port, the second working oil port is communicated with the third working oil port, the hydraulic pump 100 supplies oil for the rod cavity of the first support leg oil cylinder 300, and oil in the rod-free cavity of the first support leg oil cylinder 300 flows back into the oil tank 500.
When the first three-position four-way electromagnetic directional valve is switched to the first stop position 213, the first working oil port is blocked from the second working oil port, the third working oil port and the fourth working oil port, and the second working oil port is communicated with the third working oil port and the fourth working oil port. The hydraulic pump 100 cannot supply oil to the first leg cylinder 300, and the first leg cylinder 300 is maintained in the current state.
Meanwhile, the extension or contraction speed of the first leg cylinder 300 can be adjusted by controlling the communication opening degrees between the first working oil port and the third working oil port, between the second working oil port and the fourth working oil port, between the first working oil port and the fourth working oil port, and between the second working oil port and the third working oil port.
Similarly, the second leg cylinder control valve 220 is a second three-position four-way solenoid directional valve. The second three-position four-way electromagnetic reversing valve comprises a fifth working oil port, a sixth working oil port, a seventh working oil port and an eighth working oil port. The fifth working oil port is connected with the hydraulic pump 100, the sixth working oil port is connected with the oil tank 500, the seventh working oil port is connected with the rodless cavity of the second support leg oil cylinder 400, and the eighth working oil port is connected with the rod cavity of the second support leg oil cylinder 400. The control device is connected with the second three-position four-way electromagnetic reversing valve, and can switch the working position of the second three-position four-way electromagnetic valve and control the opening of the oil port when the second three-position four-way electromagnetic valve is in different working positions.
When the second three-position four-way electromagnetic directional valve is switched to the second extending position 221, the fifth working oil port is communicated with the seventh working oil port, the sixth working oil port is communicated with the eighth working oil port, the hydraulic pump 100 supplies oil for the rodless cavity of the second supporting leg oil cylinder 400, and the oil in the rod cavity of the second supporting leg oil cylinder 400 flows back into the oil tank 500.
When the second three-position four-way electromagnetic directional valve is switched to the second contraction position 222, the fifth working oil port is communicated with the eighth working oil port, the sixth working oil port is communicated with the seventh working oil port, the hydraulic pump 100 supplies oil for the rod cavity of the second support leg oil cylinder 400, and the oil in the rodless cavity of the second support leg oil cylinder 400 flows back into the oil tank 500.
When the second three-position four-way electromagnetic directional valve is switched to the second stop position 223, the fifth working oil port is blocked from the sixth working oil port, the seventh working oil port and the eighth working oil port, and the sixth working oil port is communicated with the seventh working oil port and the eighth working oil port. The hydraulic pump 100 cannot supply oil to the second leg cylinder 400, and the second leg cylinder 400 is maintained in the current state.
Meanwhile, the extension or retraction speed of the second leg cylinder 400 can be adjusted by controlling the communication opening degrees between the fifth and seventh working oil ports, between the sixth and eighth working oil ports, between the fifth and eighth working oil ports, and between the sixth and seventh working oil ports.
A first displacement sensor is installed in the first leg cylinder 300, and a second displacement sensor is installed in the second leg cylinder 400. Wherein the first displacement sensor and the second displacement sensor may be connected to the piston or the cylinder. The first displacement sensor and the second displacement sensor can feed back detection results into the control device, and the control device can respectively control the opening degrees of oil ports of the first three-position four-way electromagnetic reversing valve and the second three-position four-way electromagnetic reversing valve based on the detection results of the first displacement sensor and the second displacement sensor. It should be noted that the first leg cylinder 300 and the first displacement sensor may be configured as a hysteresis cylinder, and likewise, the second leg cylinder 400 and the second displacement sensor may be configured as a hysteresis cylinder.
For example, when the first leg cylinder 300 and the second leg cylinder 400 are required to perform the extending operation, the control device first controls the first three-position four-way electromagnetic directional valve to switch to the first extended position 211 and the second three-position four-way electromagnetic directional valve to switch to the second extended position 221. Meanwhile, the first and second displacement sensors respectively detect the extension displacement values of the first and second leg cylinders 300 and 400 in real time. When the extension displacement value of the first leg cylinder 300 is greater than the extension displacement value of the second leg cylinder 400, the control device controls the first three-position four-way electromagnetic directional valve to reduce the communication opening between the first working oil port and the third working oil port and between the second working oil port and the fourth working oil port, and to increase the communication opening between the fifth working oil port and the seventh working oil port and between the sixth working oil port and the eighth working oil port, thereby reducing the extension speed of the first leg cylinder 300, and increasing the extension speed of the second leg cylinder 400 until the extension displacement value of the first leg cylinder 300 is equal to the extension displacement value of the second leg cylinder 400.
In one embodiment of the present utility model, the hydraulic control system further includes a master valve 600. The main control valve 600 includes a main communication port 601 and a main cut-off port 602. The control device is connected to the main control valve 600 and is used for switching the working position of the main control valve 600.
An oil inlet of the main control valve 600 is connected with the hydraulic pump 100, an oil outlet of the main control valve 600 is connected with the oil tank 500, and in a state of a main communication position 601, the oil inlet of the main control valve 600 is communicated with the oil outlet of the main control valve 600; in the state of the main cut-off position 602, the oil inlet of the main control valve 600 is cut off from the oil outlet of the main control valve 600.
In yet another embodiment of the present utility model, the master valve 600 is a solenoid valve.
In this embodiment, as shown in fig. 1, the master valve 600 is a two-position, two-way solenoid directional valve. The two-position two-way electromagnetic reversing valve comprises an oil inlet and an oil outlet. The oil inlet of the two-position two-way electromagnetic reversing valve is connected with the hydraulic pump 100, and the oil outlet of the two-position two-way electromagnetic reversing valve is connected with the oil tank 500. The control device is connected with the two-position two-way electromagnetic reversing valve and is used for switching the working position of the two-position two-way electromagnetic reversing valve. When the first and second leg cylinders 300 and 400 do not need to be operated, the hydraulic pump 100 is connected to the oil tank 500 through the two-position two-way electromagnetic directional valve when the two-position two-way electromagnetic directional valve is switched to the main connection position 601. At this time, the oil outputted from the hydraulic pump 100 flows back to the oil tank 500. When the first leg cylinder 300 and the second leg cylinder 400 need to perform telescopic action, the two-position two-way electromagnetic reversing valve is switched to the main stop position 602, and the oil output by the hydraulic pump 100 is conveyed into the first leg cylinder 300 and the second leg cylinder 400 through the first leg cylinder control valve 210 and the second leg cylinder control valve 220.
In one embodiment of the utility model, the hydraulic control system further includes a relief valve 800. An oil inlet of the relief valve 800 is connected to the hydraulic pump 100. The oil outlet of the relief valve 800 is connected to the oil tank 500. An oil filter 900 is provided at an oil outlet of the hydraulic pump 100. That is, the relief valve 800 is installed between the oil outlet of the hydraulic pump 100 and the oil tank 500, and the relief valve 800 can set the maximum relief pressure value of the hydraulic control system. When the pressure output from the hydraulic pump 100 is greater than the maximum relief pressure value, the relief valve 800 is opened, and the oil output from the hydraulic pump 100 flows back to the oil tank 500, so that each hydraulic element in the hydraulic control system can be effectively protected. Wherein the relief valve 800 includes, but is not limited to, a relief valve. Further, an oil filter 900 is provided at the outlet of the hydraulic pump 100. The oil filter 900 includes, but is not limited to, a high pressure oil filter 900. Thus, the cleanliness of the oil liquid input into the hydraulic control system can be ensured.
In one embodiment of the present utility model, a first hydraulic lock 701 is provided between first leg cylinder 300 and first leg cylinder control valve 210. A second hydraulic lock 702 is disposed between the second leg cylinder 400 and the second leg cylinder control valve 220.
Taking the first hydraulic lock 701 as an example for illustration, as shown in fig. 1, the first hydraulic lock 701 includes a first check valve and a second check valve, an oil inlet of the first check valve is connected with a third working oil port of the first three-position four-way electromagnetic directional valve, and an oil outlet of the first check valve is connected with a rodless cavity of the first leg cylinder 300. An oil inlet of the second one-way valve is connected with a fourth working oil port of the first three-position four-way electromagnetic reversing valve, and an oil inlet of the second one-way valve is connected with a rod cavity of the first supporting leg oil cylinder 300. The control oil port of the first one-way valve is connected with the oil inlet of the second one-way valve, and the control oil port of the second one-way valve is connected with the oil inlet of the first one-way valve control valve.
In the working process, when the first leg cylinder 300 needs to perform the extending action, the oil output by the hydraulic pump 100 is input into the rodless cavity of the first leg cylinder 300 through the first leg cylinder control valve 210 and the first check valve, and the oil at the oil inlet of the first check valve can reversely open the second check valve, so that the oil in the rod cavity of the first leg cylinder 300 flows back to the oil tank 500 through the second check valve and the first leg cylinder control valve 210.
When the first leg cylinder 300 needs to perform the contraction action, the oil output by the hydraulic pump 100 is input into the rod cavity of the first leg cylinder 300 through the first leg cylinder control valve 210 and the second check valve, and the oil at the oil inlet of the second check valve can reversely open the first check valve, so that the oil in the rodless cavity of the first leg cylinder 300 flows back to the oil tank 500 through the first check valve and the first leg cylinder control valve 210.
When the first leg cylinder 300 does not need the telescopic action, the first check valve and the second check valve are both in the locking state, and the oil in the rod cavity and the rodless cavity of the first leg cylinder 300 are both locked, so that the first leg cylinder 300 is locked in the current state.
In one embodiment of the utility model, the hydraulic system further comprises a speed detection device. The speed detecting means is for detecting the telescopic speed of the first and second leg cylinders 300 and 400. The control device is connected with the speed detection device. The control means is for controlling the opening degrees of the first leg cylinder control valve 210 and the second leg cylinder control valve 220, respectively, based on the detection result of the speed detection means.
It should be noted here that, during operation, the control device adjusts the opening degrees of the first leg cylinder control valve 210 and the second leg cylinder control valve 220 based on the detection results of both the speed detection device and the displacement detection device. Specifically, in the initial state, the telescopic displacement value of the first leg cylinder 300 is the same as the telescopic displacement value of the second leg cylinder 400, and at this time, the control device makes the first leg cylinder 300 and the second leg cylinder 400 to expand and contract at the same speed by adjusting the opening degrees of the first leg cylinder control valve 210 and the second leg cylinder control valve 220, so as to maintain the synchronous expansion and contraction actions of the first leg cylinder 300 and the second leg cylinder 400. In the subsequent expansion and contraction process, if the expansion and contraction displacement values of the first leg oil cylinder 300 and the second leg oil cylinder 400 are different due to oil leakage and other phenomena, the control device adjusts the opening degrees of the first leg oil cylinder control valve 210 and the second leg oil cylinder control valve 220 so that the first leg oil cylinder 300 and the second leg oil cylinder 400 expand and contract at different speeds, and then the expansion and contraction displacement values of the first leg oil cylinder 300 and the second leg oil cylinder 400 are adjusted to be in a consistent state as soon as possible. When the telescopic displacement value of the first leg cylinder 300 and the telescopic displacement value of the second leg cylinder 400 are consistent, the control device enables the first leg cylinder 300 and the second leg cylinder 400 to be telescopic at the same speed by adjusting the opening degrees of the first leg cylinder control valve 210 and the second leg cylinder control valve 220, and therefore, the telescopic displacement value of the first leg cylinder 300 and the telescopic displacement value of the second leg cylinder 400 are kept consistent as long as possible.
Or, in the working process, the control device firstly adjusts the synchronicity of the actions of the first support leg oil cylinder 300 and the second support leg oil cylinder 400 based on the detection result of the displacement detection device, and then adjusts the isoacceleration of the actions of the first support leg oil cylinder 300 and the second support leg oil cylinder 400 based on the detection result of the speed detection device when the first support leg oil cylinder 300 and the second support leg oil cylinder 400 are in the synchronous state.
The control adjusts the synchronicity and the same speed of the first and second leg cylinders 300 and 400 in the same manner regardless of whether the first and second legs on both sides of the work machine are in the pre-swing position or the post-swing position.
For example, in a further embodiment of the present utility model, two speed modes, namely a high speed mode and a low speed mode, are set in the control device. For example, when the leg extension operation is performed in the high-speed mode, the current value corresponding to the first three-position four-way electromagnetic directional valve is A1, and the current value corresponding to the second three-position four-way directional valve is B1. When the landing leg extends in the low-speed mode, the current value corresponding to the first three-position four-way electromagnetic reversing valve is A2, and the current value corresponding to the second three-position four-way reversing valve is B2. That is, when the current value of the first three-position four-way electromagnetic directional valve is A1 and the current value of the second three-position four-way directional valve is B1, the first leg cylinder 300 and the second leg cylinder 400 perform the extending operation at the same speed at a relatively large speed. When the current value of the first three-position four-way electromagnetic directional valve is A2 and the current value of the second three-position four-way directional valve is B2, the first leg cylinder 300 and the second leg cylinder 400 perform the extending action at the same speed at a relatively small speed. Because the left and right weight distribution of the whole working machine is uneven, when the first support leg oil cylinder 300 and the second support leg oil cylinder 400 extend at the same speed, the current value of the first three-position four-way electromagnetic directional valve is not equal to the current value of the second three-position four-way directional valve. That is, when the first and second leg cylinders 300 and 400 are extended at the same speed, A1 and B1 are not generally equal, and A2 and B2 are also not generally equal.
In the initial state, the first and second leg cylinders 300 and 400 may be selected to operate in a high-speed mode or a low-speed mode. For example, the first leg and the second leg are selected to operate in the high speed mode, at which time the current value of the first three-position four-way electromagnetic directional valve is A1, the current value of the second three-position four-way electromagnetic directional valve is B1, and the first leg cylinder 300 and the second leg cylinder 400 are extended at the same speed. In the extension process, when the extension displacement value of the first leg cylinder 300 is different from the extension displacement value of the second leg cylinder 400, the control device performs corresponding adjustment. For example, when the extension displacement value of the first leg cylinder 300 is greater than the extension displacement value of the second leg cylinder 400, the control device controls to decrease the current value of the first three-position four-way electromagnetic directional valve and increase the current value of the second three-position four-way electromagnetic directional valve so that the extension speed of the first leg cylinder 300 decreases and the extension speed of the second leg cylinder 400 increases until the extension displacement value of the first leg cylinder 300 is equal to the extension displacement value of the second leg cylinder 400, and then the control device controls the current value of the first three-position four-way electromagnetic directional valve to be restored to A1 and the current value of the second three-position four-way electromagnetic directional valve to be restored to B1. At this time, the first and second leg cylinders 300 and 400 are again extended at the same speed.
The process of performing the contracting action in the different modes of the first and second leg cylinders 300 and 400 is similar to the above process, and will not be described again.
Embodiments of the second aspect of the present utility model provide a work machine comprising a hydraulic control system as described above.
For example, in one embodiment of the present disclosure, the work machine is a milling machine.
It should be understood herein that the above-described embodiment is only one exemplary embodiment of the present utility model and should not be construed as limiting the present utility model in any way. That is, specific types of work machines described above, including but not limited to milling machines, and other work machines that include a hydraulic control system for controlling the simultaneous lifting of two legs, are within the scope of the present disclosure.
Further, since the work machine includes the hydraulic control system as described above, it also has the advantages as described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A hydraulic control system is characterized by comprising a hydraulic pump, a landing leg oil cylinder control valve group, a first landing leg oil cylinder, a second landing leg oil cylinder, a displacement detection device and a control device,
the hydraulic pump is connected with the first support leg oil cylinder and the second support leg oil cylinder through the support leg oil cylinder control valve group, the displacement detection device is used for detecting the displacement of the first support leg oil cylinder and the second support leg oil cylinder, the control device is connected with the displacement detection device and the support leg oil cylinder control valve group, and the control device is used for controlling the opening of the support leg oil cylinder control valve group based on the detection result of the displacement detection device so as to enable the first support leg oil cylinder and the second support leg oil cylinder to stretch synchronously.
2. The hydraulic control system of claim 1, wherein the leg cylinder control valve block includes a first leg cylinder control valve and a second leg cylinder control valve, the displacement detection device includes a first displacement sensor and a second displacement sensor,
the hydraulic pump is connected with the first support leg oil cylinder through the first support leg oil cylinder control valve, the hydraulic pump is connected with the second support leg oil cylinder through the second support leg oil cylinder control valve, the first displacement sensor is mounted to the first support leg oil cylinder, the second displacement sensor is mounted to the second support leg oil cylinder, and the control device controls the opening degrees of the first support leg oil cylinder control valve and the second support leg oil cylinder control valve respectively based on detection results of the first displacement sensor and the second displacement sensor.
3. The hydraulic control system of claim 2, wherein the first leg cylinder control valve includes a first extended position, a first closed position, and a first retracted position,
in the state of the first extension position, a rodless cavity of the first support leg oil cylinder is communicated with the hydraulic pump through the first support leg oil cylinder control valve, and a rod cavity of the first support leg oil cylinder is communicated with an oil tank through the first support leg oil cylinder control valve;
in the first contracted state, the rodless cavity of the first support leg oil cylinder is communicated with the oil tank through the first support leg oil cylinder control valve, and the rod cavity of the first support leg oil cylinder is communicated with the hydraulic pump through the first support leg oil cylinder control valve;
and in the state of the first stop position, the rodless cavity and the rod cavity of the first support leg oil cylinder are both stopped with the hydraulic pump.
4. The hydraulic control system of claim 2, wherein the second leg cylinder control valve includes a second extended position, a second closed position, and a second contracted position,
in the second extending position state, the rodless cavity of the second supporting leg oil cylinder is communicated with the hydraulic pump through the second supporting leg oil cylinder control valve, and the rod cavity of the second supporting leg oil cylinder is communicated with the oil tank through the second supporting leg oil cylinder control valve;
in the second contracted state, the rodless cavity of the second support leg oil cylinder is communicated with the oil tank through the second support leg oil cylinder control valve, and the rod cavity of the second support leg oil cylinder is communicated with the hydraulic pump through the second support leg oil cylinder control valve;
and in the second stop position state, the rodless cavity and the rod cavity of the second support leg oil cylinder are both stopped with the hydraulic pump.
5. The hydraulic control system of claim 3 or 4, further comprising a master valve comprising a master communication position and a master cut-off position, wherein the control device is connected to the master valve and is configured to switch the master valve to an operating position,
an oil inlet of the main control valve is connected with the hydraulic pump, an oil outlet of the main control valve is connected with the oil tank, and in the state of the main communication position, the oil inlet of the main control valve is communicated with the oil outlet of the main control valve; and in the state of the main stop position, an oil inlet of the main control valve and an oil outlet of the main control valve are stopped.
6. The hydraulic control system of any one of claims 2-4, wherein a first hydraulic lock is disposed between the first leg cylinder and the first leg cylinder control valve, and a second hydraulic lock is disposed between the second leg cylinder and the second leg cylinder control valve.
7. The hydraulic control system according to any one of claims 2 to 4, further comprising speed detection means for detecting the expansion and contraction speeds of the first and second leg cylinders, the control means being connected to the speed detection means, the control means being for controlling the opening degrees of the first and second leg cylinder control valves, respectively, based on the detection result of the speed detection means.
8. The hydraulic control system of claim 5, wherein the first leg cylinder control valve, the second leg cylinder control valve, and the master control valve are solenoid valves.
9. The hydraulic control system of claim 5, further comprising a relief valve, an oil inlet of the relief valve being connected to the hydraulic pump, an oil outlet of the relief valve being connected to the oil tank, an oil filter being provided at the oil outlet of the hydraulic pump.
10. A work machine comprising a hydraulic control system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320025280.6U CN218971527U (en) | 2023-01-03 | 2023-01-03 | Hydraulic control system and working machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320025280.6U CN218971527U (en) | 2023-01-03 | 2023-01-03 | Hydraulic control system and working machine |
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| CN218971527U true CN218971527U (en) | 2023-05-05 |
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| CN202320025280.6U Active CN218971527U (en) | 2023-01-03 | 2023-01-03 | Hydraulic control system and working machine |
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| Country | Link |
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| CN (1) | CN218971527U (en) |
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2023
- 2023-01-03 CN CN202320025280.6U patent/CN218971527U/en active Active
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