CN214935568U - Adaptive control system for amplitude-variable oil cylinder and operation machine - Google Patents
Adaptive control system for amplitude-variable oil cylinder and operation machine Download PDFInfo
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- CN214935568U CN214935568U CN202120778057.XU CN202120778057U CN214935568U CN 214935568 U CN214935568 U CN 214935568U CN 202120778057 U CN202120778057 U CN 202120778057U CN 214935568 U CN214935568 U CN 214935568U
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Abstract
The utility model relates to an operation machinery technical field provides a become width of cloth hydro-cylinder self-adaptation control system and operation machinery, include: a first oil supply and return mechanism; the balance valve comprises a control valve, an electric proportional throttle valve and a one-way valve, wherein the control end of the control valve is connected with the oil supply end of the first oil supply and return mechanism through a damping piece, the oil return end of the control valve is connected with the oil return end of the first oil supply and return mechanism, the main oil circuit end of the control valve is connected with the rodless cavity of the luffing cylinder, the electric proportional throttle valve is respectively connected with the control end of the control valve and the oil return end of the first oil supply and return mechanism, and the first end of the one-way valve is connected with the rodless cavity of the luffing cylinder; and the second oil supply and return mechanism is respectively connected with the second end of the one-way valve and the rod cavity of the amplitude variation oil cylinder. The utility model discloses an electricity proportion choke valve's opening size in the regulating balance valve realizes the regulation of hydraulic damping ratio to adapt to different operating modes.
Description
Technical Field
The utility model relates to an operation machinery technical field especially relates to a become width of cloth hydro-cylinder self-adaptation control system and operation machinery.
Background
In the existing working machinery, such as an excavator, a crawler crane and the like, a pilot control oil path of a balance valve of a luffing cylinder generally adopts a D-type half-bridge structure, and the hydraulic damping ratio in the balance valve of a D-type half-bridge pilot bridge circuit is fixed and cannot be adjusted. Therefore, under different working conditions and different environmental temperatures, the stability and the opening response of the device cannot achieve the expected effect, and the matching cannot be realized, which causes certain troubles to the use.
SUMMERY OF THE UTILITY MODEL
The utility model provides a become width of cloth hydro-cylinder adaptive control system and operation machinery will become width of cloth hydro-cylinder balance valve guide bridge circuit and change into B type half-bridge, through the opening size of electricity proportion choke valve in the regulation balance valve, realize the regulation of hydraulic damping ratio to adapt to different operating modes.
The utility model provides a become width of cloth hydro-cylinder self-adaptation control system, include: a first oil supply and return mechanism; the balance valve comprises a control valve, an electric proportional throttle valve and a one-way valve, wherein the control end of the control valve is connected with the oil supply end of the first oil supply and return mechanism through a damping piece, the oil return end of the control valve is connected with the oil return end of the first oil supply and return mechanism, the main oil circuit end of the control valve is connected with the rodless cavity of the luffing cylinder, the electric proportional throttle valve is respectively connected with the control end of the control valve and the oil return end of the first oil supply and return mechanism, and the first end of the one-way valve is connected with the rodless cavity of the luffing cylinder; and the second oil supply and return mechanism is respectively connected with the second end of the one-way valve and the rod cavity of the amplitude variation oil cylinder.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system still includes temperature sensor, pressure sensor and controller, temperature sensor detects the temperature of hydraulic oil, pressure sensor set up in the control end of control valve, the controller respectively with electricity proportion choke valve, temperature sensor and pressure sensor link to each other, the controller is configured to adjust according to the temperature and the pressure value that detect the opening size of electricity proportion choke valve is in order to adjust the pressure of the control end of control valve.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, first oil tank, guide's pump and first switching-over valve are drawn together to first oil supply return mechanism, first oil tank is equipped with first oil return end that supplies return mechanism, guide's pump both ends respectively with first oil tank with first switching-over valve links to each other, first switching-over valve is equipped with first oil supply return mechanism's oil supply end, just first switching-over valve with first oil tank links to each other.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, first oil supply return mechanism still includes first overflow valve, first overflow valve connect in the guide's pump with between the first switching-over valve and with first oil tank links to each other.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, first switching-over valve is two-position four-way switching-over valve.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, the balanced valve still includes the second overflow valve, the both ends of second overflow valve respectively with the control end of control valve with the oil return end of first confession oil return mechanism links to each other.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, the balanced valve still includes the back pressure valve, the both ends of back pressure valve respectively with the time oil return end of control valve with the time oil return end of first confession oil return mechanism links to each other.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, the control valve is two-position two-way control valve.
According to the utility model provides a pair of become width of cloth hydro-cylinder self-adaptation control system, second supplies oil return mechanism to include second oil tank, oil pump and second switching-over valve, the oil pump with the second oil tank links to each other, the second switching-over valve respectively with the oil pump the second of check valve end become width of cloth hydro-cylinder have the pole chamber with the second oil tank links to each other.
The utility model also provides an operation machine, include amplitude of variation hydro-cylinder adaptive control system.
The utility model provides a become width of cloth hydro-cylinder adaptive control system and operation machinery will become width of cloth hydro-cylinder balance valve guide bridge circuit and change into B type half-bridge, through the opening size of electricity proportion choke valve in the regulation balance valve, realize the regulation of hydraulic damping ratio, and then the pressure size of adjusting control valve control end to adapt to different operating modes.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a adaptive control system of a luffing cylinder provided by the present invention;
reference numerals:
1: a balancing valve; 11: a control valve; 12: a control end;
13: an oil return end; 14: a main oil line end; 15: a spring cavity;
16: an electric proportional throttle valve; 17: a one-way valve; 18: a second overflow valve; 19: a back pressure valve;
21: a rodless cavity of the amplitude-variable oil cylinder; 22: a rod cavity of the amplitude-variable oil cylinder;
3: a temperature sensor; 4: a pressure sensor; 5: a controller;
61: a first oil tank; 62: a pilot pump; 63: a first direction changing valve; 64: a first overflow valve;
71: a second oil tank; 72: an oil pump; 73: and a second direction changing valve.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that 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 the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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 and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
According to the utility model discloses an embodiment, as shown in fig. 1, the utility model provides a become width of cloth hydro-cylinder self-adaptation control system mainly includes: the first oil supply and return mechanism, the balance valve 1 and the second oil supply and return mechanism. The first oil supply and return mechanism and the second oil supply and return mechanism are mainly used for supplying hydraulic oil and returning oil.
The balance valve 1 mainly comprises a control valve 11, an electric proportional throttle valve 16 and a one-way valve 17, wherein a control end 12 of the control valve 11 is connected with an oil supply end S of a first oil supply and return mechanism through a damping piece to form a fixed hydraulic damping oil path R1The oil return end 13 of the control valve 11 is connected with the oil return end R of the first oil supply and return mechanism, and the main oil path end 14 of the control valve 11 is connected with the rodless cavity 21 of the luffing cylinder. Specifically, the spool of the control valve 11 abuts against the spring in the spring cavity 15, and the spool is pushed to stretch and displace on the spring by controlling the pressure of the control end 12, so as to control the opening degree of the valve port of the main oil path end 14 of the control valve 11, and further control the flow rate of hydraulic oil entering the control valve 11 from the rodless cavity 21 of the luffing oil cylinder through the main oil path end 14 of the control valve 11 when the luffing oil cylinder falls, thereby realizing the stable falling of the luffing oil cylinder. And the draining port of the spring cavity 15 is connected with the oil return end R of the first oil supply and return mechanism, because hydraulic oil leaks to the spring cavity 15 between the valve core and the valve body of the control valve 11, if the valve core is blocked and accumulated for a long time, the spring cavity 15 is filled with hydraulic oil, the valve core can be blocked from moving, the valve core can not act, and the pressure regulating function can not be achieved. The utility model discloses an above-mentioned setting can real-time draining, prevents that above-mentioned problem from taking place.
The utility model discloses specific type of control valve 11 is not special restriction, as long as can play the effect of control oil circuit break-make can, in this example, control valve 11 adopts two-position two-way control valve.
The electric proportional throttle valve 16 is connected with the control end 12 of the control valve 11 to form a variable hydraulic damping oil path R2And the electric proportional throttle valve 16 is connected with the oil return end R of the first oil supply and return mechanism. Specifically, the hydraulic damping oil passage R is fixed1And a variable hydraulic damping oil passage R2Determines the pressure at the control end 12 of the control valve 11, and the hydraulic damping oil path R is fixed1The hydraulic damping in the hydraulic circuit of the balancing valve 1 is constant, and the electric proportional throttle valve 16 is used for adjusting the variableHydraulic damping oil circuit R2Is variable, and therefore the magnitude of the pressure at the control end 12 of the control valve 11 is determined by the electro-proportional throttle valve 16. In the traditional D-type half bridge, fixed hydraulic damping is adopted in the balance valve 1, and the balance valve cannot be regulated and controlled and cannot achieve the expected use effect under different working conditions or environments. The utility model discloses a 16 open-ended sizes of control electricity proportion choke valve can adjust the pressure of the control end 12 of control valve 11 in the balanced valve 1 to guarantee that equipment moves fast and steady.
In one embodiment, the electro-proportional throttle 16 is a proportional electro-proportional throttle, which opens more as the control current is greater, resulting in a variable hydraulic damping oil path R2The smaller the hydraulic damping, i.e. the smaller the pressure at the control end 12 of the control valve 11, the smaller the compression amount of the spring, so that the smaller the opening degree of the valve port at the main oil path end 14 of the control valve 11, the smaller the flow rate of the hydraulic oil entering the control valve 11 from the rodless chamber 21 of the luffing cylinder.
In one embodiment, the electro-proportional throttle 16 is an anti-proportional electro-proportional throttle, and the larger the control current, the smaller the opening thereof, such that the variable hydraulic damping oil path R2The larger the hydraulic damping is, that is, the larger the pressure at the control end 12 of the control valve 11 is, the larger the compression amount of the spring is, so that the larger the opening degree of the valve port at the main oil path end 14 of the control valve 11 is, the larger the flow rate of the hydraulic oil entering the control valve 11 from the rodless cavity of the luffing cylinder is.
Specifically, when the lifted weight falls by means of self weight, different lifted weights apply different forces F to the variable amplitude cylinder, in order to control the lever of the variable amplitude cylinder to fall uniformly and stably under different forces F (for example, 10 to 100t), the valve port of the main oil path end 14 of the control valve 11 needs to be controlled to be opened at different opening degrees, when the force F is larger, the corresponding hydraulic oil flow is large, the speed is high, therefore, the valve port opening degree of the main oil path end 14 of the control valve 11 needs to be controlled to be smaller by adjusting the electric proportional throttle valve 16, the flow is reduced, the speed is reduced, and the control valve is stabilized within a certain speed range and falls stably.
And, as the working time of the working machine is prolonged, the temperature of the hydraulic oil rises, which causes the viscosity of the hydraulic oil to be reduced, the density of the hydraulic oil to be reduced, the damping of the fixed hydraulic damping to the hydraulic oil is reduced, the pressure building process at the control end 12 of the control valve 11 is slower than that before the temperature rises (room temperature), namely, the pressure building time is longer, which affects the action response, at this time, the opening degree of the valve port of the control valve is reduced by adjusting the electric proportional throttle valve 16, so that the pressure can be built quickly, the pressure building time is shortened, and the response is faster.
The first end of the one-way valve 17 is connected with a rodless cavity 21 of the luffing cylinder, and the second oil supply and return mechanism is respectively connected with the second end of the one-way valve 17 and a rod cavity 22 of the luffing cylinder.
Therefore, the utility model discloses this embodiment changes become the width of cloth hydro-cylinder balance valve guide bridge circuit into B type half-bridge, through the opening size of electricity proportion choke valve in the regulation balance valve, realizes the regulation of hydraulic damping ratio, and then the pressure size of regulation control valve control end to adapt to different operating modes.
According to the embodiment of the utility model, the utility model discloses still include temperature sensor 3, pressure sensor 4 and controller 5, temperature sensor 3 mainly used detects the temperature of hydraulic oil, can set up in whole hydraulic pressure oil circuit, also can set up in first oil tank 61 of first oil feed back mechanism, pressure sensor 4 sets up in control end 12 of control valve 11, controller 5 respectively with electric proportion choke valve 16, temperature sensor 3 and pressure sensor 4 link to each other, controller 5 is configured as the pressure of the opening size of adjusting electric proportion choke valve 16 with the control end 12 of adjusting control valve 11 according to real-time detection's temperature and pressure value, in order to realize different pressure, the operating mode under the different temperatures is adjusted, concrete regulation principle sees above-mentioned.
According to the utility model discloses an embodiment, first oil feed return mechanism includes first oil tank 61, guide 'S pump 62 and first switching-over valve 63, first oil tank 61 is equipped with first oil feed return mechanism' S time oil end R, guide 'S pump 62 both ends link to each other with first oil tank 61 and first switching-over valve 63 respectively, first switching-over valve 63 is equipped with first oil feed return mechanism' S time oil end S, and first switching-over valve 63 links to each other with first oil tank 61 for the oil circuit break-make that control got into the balanced valve, its specific type does not do not restrict very much. In this example, the first direction valve 63 is a two-position four-way electromagnetic direction valve having a pressure port P, an oil return port T, a working port a, and a working port B, the pressure port P is connected to the pilot pump 62, the working port a is connected to the control end 12 of the control valve 11, and the working port B is connected to the first oil tank 61, so that when power is supplied, the pressure port P is connected to the working port a to supply oil to the balance valve 1, and when not operating, the oil return port T is connected to the working port B to return oil, and at this time, oil is not supplied to the balance valve 1.
Further, the first oil supply and return mechanism further comprises a first overflow valve 64, a first end of the first overflow valve 64 is connected between the pilot pump 62 and the pressure port P of the first reversing valve 63, and a second end of the first overflow valve 64 is connected with the first oil tank 61 for flow limiting and safety protection.
According to the utility model discloses an embodiment, balanced valve 1 still includes second overflow valve 18, and the both ends of second overflow valve 18 link to each other with control end 12 and first oil tank 61 of control valve 11 respectively, play the safety protection effect.
And, the balance valve 1 further comprises a back pressure valve 19, and two ends of the back pressure valve 19 are respectively connected with the oil return end 13 of the control valve 11 and the first oil tank 61 for stabilizing pressure.
According to the utility model discloses an embodiment, second oil supply and return mechanism includes second oil tank 71, oil pump 72 and second switching-over valve 73, and oil pump 72 links to each other with second oil tank 71, and second switching-over valve 73 links to each other with second end, the pole chamber 22 that becomes width of cloth hydro-cylinder and second oil tank 71 of oil pump 72, check valve 17 respectively. The second direction valve 73 is used to control the on/off of the oil path, and the specific type thereof is not particularly limited. In this example, the second directional valve 73 is a three-position six-way pilot operated directional valve having a pressure port p, an oil return port t, a pilot port a and a pilot port b, a working port c and a working port d, the pressure port p is connected to the oil pump 72, the oil return port t is connected to the second oil tank 71, the pilot port a and the pilot port b are controlled by other power sources, in this example, the pilot pump 62 actually controls the pilot port a and the pilot port b, not shown in the figure, the working port c is connected to the second end of the check valve 17, the working port d is connected to the rod chamber 22 and the second oil tank 71 of the luffing cylinder, respectively, and the rod chamber 22 and the second oil tank 71 of the luffing cylinder are connected.
It can be understood that the first oil tank 61 and the second oil tank 71 are actually the same oil tank.
The following is the utility model provides a become width of cloth hydro-cylinder adaptive control system's theory of operation describes, mainly including the process of lifting and the whereabouts process that becomes width of cloth hydro-cylinder.
Lifting process of the amplitude-variable oil cylinder: the first reversing valve 63 does not act, the hydraulic oil in the pilot pump 62 acts on the control port b of the second reversing valve 73 to enable the hydraulic oil to work at the right position, the pressure port p is communicated with the working port c, the working port d is communicated with the oil return port t, the hydraulic oil in the oil pump 72 flows through the one-way valve 17 in the balance valve 1 through the pressure port p and the working port c of the second reversing valve 73 to enter the rodless cavity 21 of the luffing cylinder, and the hydraulic oil in the rod cavity 22 of the luffing cylinder flows back to the second oil tank 71 or directly flows back to the second oil tank 71 through the working port d and the oil return port t of the second reversing valve 73 to complete lifting.
The dropping process of the amplitude-variable oil cylinder is as follows: when the variable-amplitude oil cylinder falls, the gravity of the telescopic boom of the operation machine falls, and the method specifically comprises the following steps: the hydraulic oil in the pilot pump 62 acts on the control port a of the second reversing valve 73 to enable the control port a to work at the left position, the pressure port p is connected with the working port d, the working port c is connected with the oil return port t, the oil path of the one-way valve 17 is cut off, the hydraulic oil in the oil pump 72 directly flows back to the second oil tank 71 through the pressure port p and the working port d, and the hydraulic oil does not enter the rod cavity 22 of the amplitude-variable oil cylinder and falls down by means of the gravity of the telescopic arm of the operation machine; meanwhile, the first reversing valve 63 is controlled to be electrified, the pressure port P is communicated with the working port A, hydraulic oil in the pilot pump 62 flows into the control valve 11 in the balance valve 1 through the first reversing valve 63, the electric proportional throttle valve 16 is adjusted at the same time, a valve core of the control valve 11 is pushed open, the hydraulic oil in the rodless cavity 21 of the luffing cylinder flows back to the first oil tank 61 through the control valve 11 in the balance valve 1, and the hydraulic oil falls.
The utility model also provides an operation machine, including above-mentioned embodiment become width of cloth hydro-cylinder adaptive control system. The specific type of the working machine of the present invention is not particularly limited, and may be, for example, an excavator, a crawler crane, or the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A adaptive control system for a luffing cylinder is characterized by comprising:
a first oil supply and return mechanism;
the balance valve comprises a control valve, an electric proportional throttle valve and a one-way valve, wherein the control end of the control valve is connected with the oil supply end of the first oil supply and return mechanism through a damping piece, the oil return end of the control valve is connected with the oil return end of the first oil supply and return mechanism, the main oil circuit end of the control valve is connected with the rodless cavity of the luffing cylinder, the electric proportional throttle valve is respectively connected with the control end of the control valve and the oil return end of the first oil supply and return mechanism, and the first end of the one-way valve is connected with the rodless cavity of the luffing cylinder;
and the second oil supply and return mechanism is respectively connected with the second end of the one-way valve and the rod cavity of the amplitude variation oil cylinder.
2. The adaptive control system for the luffing cylinder according to claim 1, further comprising a temperature sensor, a pressure sensor and a controller, wherein the temperature sensor detects the temperature of hydraulic oil, the pressure sensor is disposed at the control end of the control valve, the controller is respectively connected to the electric proportional throttle valve, the temperature sensor and the pressure sensor, and the controller is configured to adjust the opening size of the electric proportional throttle valve according to the detected temperature and pressure values to adjust the pressure at the control end of the control valve.
3. The adaptive control system for the luffing cylinder according to claim 1, wherein the first oil supply and return mechanism comprises a first oil tank, a pilot pump and a first reversing valve, the first oil tank is provided with an oil return end of the first oil supply and return mechanism, two ends of the pilot pump are respectively connected with the first oil tank and the first reversing valve, the first reversing valve is provided with an oil supply end of the first oil supply and return mechanism, and the first reversing valve is connected with the first oil tank.
4. The adaptive control system for the luffing cylinder according to claim 3, wherein the first oil supply and return mechanism further comprises a first overflow valve, and the first overflow valve is connected between the pilot pump and the first reversing valve and is connected with the first oil tank.
5. The adaptive variable amplitude cylinder control system as recited in claim 3, wherein the first directional valve is a two-position, four-way directional valve.
6. The adaptive control system for the variable amplitude oil cylinder as claimed in claim 1, wherein the balance valve further comprises a second overflow valve, and two ends of the second overflow valve are respectively connected with the control end of the control valve and the oil return end of the first oil supply and return mechanism.
7. The adaptive control system for the variable amplitude oil cylinder as claimed in claim 1, wherein the balance valve further comprises a back pressure valve, and two ends of the back pressure valve are respectively connected with an oil return end of the control valve and an oil return end of the first oil supply and return mechanism.
8. The adaptive variable amplitude cylinder control system as recited in claim 1, wherein the control valve is a two-position two-way control valve.
9. The adaptive control system for the luffing cylinder according to claim 1, wherein the second oil supply and return mechanism comprises a second oil tank, an oil pump and a second directional valve, the oil pump is connected with the second oil tank, and the second directional valve is respectively connected with the oil pump, the second end of the one-way valve, the rod cavity of the luffing cylinder and the second oil tank.
10. A work machine comprising the adaptive luffing cylinder control system of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120778057.XU CN214935568U (en) | 2021-04-15 | 2021-04-15 | Adaptive control system for amplitude-variable oil cylinder and operation machine |
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| CN202120778057.XU CN214935568U (en) | 2021-04-15 | 2021-04-15 | Adaptive control system for amplitude-variable oil cylinder and operation machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115557390A (en) * | 2022-09-15 | 2023-01-03 | 中联重科股份有限公司 | Suspension arm lifting control system, tower crane and hydraulic control loop of damping oil cylinder |
-
2021
- 2021-04-15 CN CN202120778057.XU patent/CN214935568U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115557390A (en) * | 2022-09-15 | 2023-01-03 | 中联重科股份有限公司 | Suspension arm lifting control system, tower crane and hydraulic control loop of damping oil cylinder |
| CN115557390B (en) * | 2022-09-15 | 2024-04-16 | 中联重科股份有限公司 | Boom lifting control system, tower crane and hydraulic control loop of damping cylinder |
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