CN113311884A - Active pressure compensation device and method and double-wheel slot milling machine - Google Patents
Active pressure compensation device and method and double-wheel slot milling machine Download PDFInfo
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- CN113311884A CN113311884A CN202110599215.XA CN202110599215A CN113311884A CN 113311884 A CN113311884 A CN 113311884A CN 202110599215 A CN202110599215 A CN 202110599215A CN 113311884 A CN113311884 A CN 113311884A
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Abstract
The invention discloses an active pressure compensation device, an active pressure compensation method and a double-wheel slot milling machine, relates to the field of piling machinery, and is used for automatically adjusting the internal pressure of a working device. The active pressure compensation device comprises an oil converter, a working device, a detection assembly and a control device. The oil converter comprises a first cavity and a second cavity which are not communicated with each other; the sum of the volumes of the first cavity and the second cavity is determined and the volume change trends are opposite. The working device is in fluid communication with the second cavity. The detection assembly is used for detecting third fluid pressure outside the working device and second fluid pressure inside the working device. The control device is communicatively coupled to the sensing assembly and configured to control a volume of the first cavity based on a difference between the sensed third fluid pressure and the sensed second fluid pressure to control an internal pressure of the working device. The technical scheme realizes real-time and dynamic adjustment of the internal pressure of the working device.
Description
Technical Field
The invention relates to the field of piling machinery, in particular to an active pressure compensation device and method and a double-wheel slot milling machine.
Background
When the double-wheel slot milling machine operates underwater, the external pressure borne by the working device of the double-wheel slot milling machine is gradually increased along with the increasing of the working depth, and at the moment, the working device has the risk of entering muddy water due to the failure of a sealing element, so that in order to prevent the risk, the internal pressure of the working device is equal to or slightly greater than the external pressure.
In the related art, the following compensator is used to change the internal pressure of the working device: the pressure sensing element is used for sensing and transmitting external water pressure, and then the resilience force of the spring is used for pressurization, so that the pressure inside the working device is slightly larger than the external pressure.
The inventor finds that at least the following problems exist in the prior art: since the working depth of the working device is constantly changing, the compensators provided in the related art can only provide a certain pressure value, which makes the compensators unable to meet the actual working requirements of the double-wheel slot milling machine. After the double-wheel slot milling machine starts to work, the pressure difference provided by the compensator cannot change along with the change of the water depth, and if the initial pressure set by the compensator is small, the double-wheel slot milling machine can only adapt to shallow water operation. If the initial pressure of the compensator is set to be too high in order to meet the construction requirement of deep water, the internal pressure of the working device is too high in shallow water, and the oil liquid in the working device risks leaking outwards.
Disclosure of Invention
The invention provides an active pressure compensation device, an active pressure compensation method and a double-wheel slot milling machine, which are used for automatically adjusting the internal pressure of a working device.
An embodiment of the present invention provides an active pressure compensation apparatus, including:
the oil converter comprises a first cavity and a second cavity which are not communicated with each other; the sum of the volumes of the first cavity and the second cavity is determined, and the volumes of the first cavity and the second cavity have opposite trend; wherein the first cavity is configured to hold a first fluid and the second cavity is configured to hold a second fluid;
a working device in fluid communication with the second cavity; in the working mode, a third fluid is arranged outside the working device;
a detection assembly configured to detect a third fluid pressure outside the working device and a second fluid pressure inside the working device; and
the control device is in communication connection with the detection assembly; the control device is configured to determine whether to inject the first fluid into the first cavity based on a difference between the third fluid pressure and the second fluid pressure detected by the detection assembly.
In some embodiments, the oil converter comprises:
a housing; and
a bladder mounted inside the housing, the bladder being configured to be deformable; wherein the bladder lumen serves as the first cavity configured to hold a first fluid; the space between the inner wall of the housing and the outer wall of the bladder acts as a second cavity configured to hold a second fluid.
In some embodiments, the active pressure compensation device further comprises:
a power source in fluid communication with the first cavity to deliver a first fluid to the first cavity.
In some embodiments, the power source is coupled to the control device and configured to replenish the first cavity with a first fluid upon receiving an oil replenishment signal from the control device.
In some embodiments, the detection component comprises:
a first detection element installed inside the working device; and
the second detection element is arranged at the electric cabinet above the working device;
wherein the control device is configured to determine whether to introduce the first fluid into the first cavity according to the pressure difference detected by the first detection element and the second detection element.
In some embodiments, the control device is configured to calculate a third fluid pressure P external to the working device according to the following formula;
P＝P1+g(ρ0h0+ρ1h1)；
ρ1＝M/Q；
M＝Q1ρz+(Q-Q1)ρ0；
Q1＝Lbh；
wherein, P1The pressure value of the third fluid at the electric cabinet detected by the second detection element; g is a constant; rho0Is the density of the third fluid at the electric cabinet; h is0The height value of the second detection element from the top of the stirring area during working; rho1A density value of a third fluid external to the working device; h is1The height value of the stirring area during working; m is the mass of the slurry discharged in a unit time interval, and Q is the volume of the discharged slurry in the unit time interval; q1The quantity of the slag stones milled in a unit time interval is; rhozIs the slag density; l is the length of the slotted hole; b is the width of the slot; h is the depth of penetration per unit time interval.
In some embodiments, the control device issues an oil replenishment signal if the third fluid pressure P and the second fluid pressure P' inside the working device do not satisfy the following relationship when the working device is in the working mode: delta P1≤ΔP＝P′-P≤ΔP2(ii) a Wherein, Δ P1And Δ P2Are both greater than 0.
In some embodiments, the active pressure compensation device further comprises:
an oil dump assembly in fluid communication with the first cavity to release the first fluid in the first cavity.
In some embodiments, the control device is further configured to perform the following operations: before the working device needs to be lifted out of the third fluid, judging that P' > P0Whether the result is true or not; if so, and the third fluid pressure P and the second fluid pressure P' inside the working device do not satisfy the following relationship: delta P1≤ΔP＝P′-P≤ΔP2The control device sends a drain signal to release the first fluid in the first cavity until P ═ P0(ii) a Wherein P' is a second fluid pressure inside the working device in real time, P0An initial pressure value set for the working device.
In some embodiments, the oil converter includes a cylinder, one of a rod chamber and a rodless chamber of the cylinder being the first cavity, and the other of the rod chamber and the rodless chamber of the cylinder being the second cavity.
In some embodiments, the oil converter is external to the working device.
In some embodiments, the material of the bladder comprises rubber.
The embodiment of the invention also provides a double-wheel slot milling machine which comprises the active pressure compensation device provided by any technical scheme of the invention.
The embodiment of the invention also provides an active pressure compensation method, which is realized by adopting the active pressure compensation device provided by any technical scheme of the invention, and the method comprises the following steps:
judging whether the difference value delta P between the third fluid pressure and the second fluid pressure is within a set range or not; wherein the set range is Δ P1≤ΔP＝P′-P≤ΔP2；
And if the difference value delta P between the third fluid pressure and the second fluid pressure is within a set range, the first cavity is not subjected to oil supplementing operation.
In some embodiments, the active pressure compensation method further comprises the steps of: if the difference Δ P between the third fluid pressure and the second fluid pressure is not within the set range, the pressure of the third fluid is adjusted to be within the set rangeThe first cavity is replenished with a first fluid such that the internal pressure of the working device is increased by a fixed value Pd。
In some embodiments, the active pressure compensation method further comprises the steps of:
before finishing the work, judging whether the second fluid pressure P' inside the real-time working device is equal to the initial pressure value P of the working device or not0；
If the second fluid pressure P' in the real-time interior of the working device is not equal to the initial pressure value P of the working device0And the difference deltap between the third fluid pressure and the second fluid pressure is not within the set range, the first fluid in the first cavity is released, so that the internal pressure of the working device is decremented by a fixed value Pd。
In some embodiments, the active pressure compensation method further comprises the steps of:
judging that the first cavity releases the first fluid and the internal pressure of the working device is reduced by PdThen, whether the second fluid pressure P' inside the working device in real time is equal to the initial pressure value P of the working device0；
If the second fluid pressure P' in the real-time interior of the working device is not equal to the initial pressure value P of the working device0And the difference value deltaP between the third fluid pressure and the second fluid pressure is not within the set range, the first fluid in the first cavity is continuously released, so that the internal pressure of the working device is decreased by the fixed value Pd；
Repeating the steps until the second fluid pressure P' inside the working device in real time is equal to the initial pressure value P of the working device0。
The active pressure compensation device provided by the technical scheme is provided with the oil converter, the working device, the detection assembly and the control device. The active pressure compensation device increases the pressure of the second cavity by filling the first cavity with the first fluid in a mode that the sum of the volumes of the first cavity and the second cavity of the oil converter is unchanged and the change trends of the volumes of the first cavity and the second cavity are opposite. Since the second cavity is in fluid communication with the working device, the internal pressure of the working device is increased, such that the internal pressure of the working device is always greater than or equal to the pressure of the external third fluid. In addition, in the process that the working depth of the working device is continuously deepened, the pressure value detected by the detection assembly is changed in real time, so that the real-time and dynamic adjustment of the internal pressure of the working device is realized according to the pressure value detected by the detection assembly, the pressure requirement of the working device changing at any time can be met in time, the requirement on the pressure is small when the working device works in shallow water, and the pressure value compensated by the active pressure compensation device is small; along with the increase of the working depth of the working device, the pressure of the compensator needs to be gradually increased, and the pressure value compensated by the active pressure compensation device is also increased.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an active pressure compensation device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an active pressure compensator oil converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an active pressure compensation device according to another embodiment of the present invention;
FIG. 4 is a schematic view of the active pressure compensation device applied to a dual-wheel slot milling machine according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of an active pressure compensation method according to an embodiment of the present invention during construction;
FIG. 6 is a schematic flow chart of an active pressure compensation method according to an embodiment of the present invention at the end of construction;
fig. 7 is a schematic flow chart of an active pressure compensation method according to an embodiment of the present invention.
Detailed Description
The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 7.
For convenience of explanation and explanation of technical solutions of the embodiments of the present invention, an example of applying the active pressure compensation device to a double-wheel slot milling machine is provided in the embodiments of the present invention. When the double-wheel slot milling machine operates underwater, the external pressure born by the working device 2 of the double-wheel slot milling machine is gradually increased along with the continuous increase of the working depth. In order to reduce, and prevent the risk of the working device 2 getting into the muddy water due to the seal failure, it is necessary to increase the pressure inside the working device 2 so that the pressure inside the working device 2 is equal to or slightly greater than the external ambient pressure, and the above compensation operation is adjusted in real time during the milling of the working device 2, continuously as the working depth of the working device 2 changes. The external environment pressure referred to herein is a pressure of the external environment at the same level as the working device 2, that is, a pressure value of a third fluid (i.e., slurry outside the working device 2) at the same level as the working device 2, which will be described later.
Referring to fig. 1 and 2, an embodiment of the present invention provides an active pressure compensation device, which includes an oil converter 1, a working device 2, a detection assembly 3, and a control device 4.
The oil converter 1 includes a first cavity 11 and a second cavity 12 that are not communicated with each other. The sum of the volumes of the first cavity 11 and the second cavity 12 is determined, and the volumes of the first cavity 11 and the second cavity 12 have opposite trend. In some embodiments, the hydro converter 1 is located a distance from the working device 2, and the hydro converter 1 need not enter the mud being worked and may be located relatively close to the operator. In other embodiments, the oil converter 1 may also be mounted on the milling cutter holder and enter the slurry with the milling cutter holder. This makes it possible for the oil converter 1 to be supplied with oil by other components of the milling cutter head, and without the need to replenish the first cavity 11 with the first fluid from the surface.
Referring to fig. 1 and 2, in some embodiments, the oil converter 1 includes a housing 13 and a bladder 14. The bladder 14 is mounted inside the housing 13, and the bladder 14 is configured to be deformable. Wherein the bladder 14 is configured to hold a first fluid, the space between the inner wall of the housing 13 and the outer wall of the bladder 14 serves as the second cavity 12, and the second cavity 12 is configured to hold a second fluid. The working device 2 is in fluid communication with the second cavity 12. The total amount of the second fluid inside the working device 2 and the second cavity 12 remains unchanged, i.e. does not affect the total amount of the second fluid inside the working device 2 and the second cavity 12, regardless of changes in the volume of the first cavity 11 and the amount of the first fluid inside. The second cavity 12 of the housing 13 is connected to the inside of the working device 2 by a line, i.e. the cavity of the housing 13 is filled with the second fluid. The second cavity 12 and the first cavity 11 of the housing 13 are not in fluid communication with each other.
Referring to fig. 1 and 2, the oil converter 1 expands the volume of the bladder 14 by filling the bladder 14 with the first fluid, thereby pressing the second fluid in the cavity between the inner wall of the housing 13 and the outer wall of the bladder 14 to pressurize the interior of the working device 2. The first fluid is, for example, hydraulic oil and the second fluid is, for example, lubricating oil. The fluid in the environment outside the working device 2 is a third fluid, such as mud.
Specifically, the housing 13 is made of a non-deformable material, that is, the internal volume of the housing 13 is substantially fixed and does not change. In some embodiments, the material of the bladder 14 comprises rubber.
In the case where the first cavity 11 is expanded, the internal space of the housing 13 occupied by the bladder 14 is large, and the volume occupied by the second cavity 12 is correspondingly small. During the process of expanding the first cavity 11, the second fluid in the second cavity 12 is squeezed, and since the second fluid is liquid and is incompressible, the pressure inside the second cavity 12 and the working device 2 has the same trend of change, which increases the pressure of the second fluid inside the working device 2, so that the internal pressure of the working device 2 is greater than the mud pressure of the environment outside the working device 2. In the process that the working depth of the working device 2 is continuously increased, the internal pressure of the working device 2 is also continuously increased, so that the internal pressure of the working device 2 is dynamically, actively adjusted in real time, and the adjustment condition is always matched with the pressure value required by the working environment where the working device 2 is located. If the working device 2 is maintained at a working depth, the ambient mud pressure outside the working device 2 is substantially constant, and there is no need to flush the first fluid into the bladder 14.
The relationship between the pressure in the second cavity 12 and the pressure in the working device 2 is the same. If the second cavity 12 and the working device 2 are located at the same height, the pressure inside the second cavity 12 and the working device 2 is the same. If the second cavity 12 and the working device 2 are located at different heights, the difference in pressure inside the second cavity 12 and the working device 2 remains constant.
The inventors have found that the density of the second fluid inside the working device 2 is not the same as the density of the third fluid outside the working device 2, which affects the difference in pressure inside and outside the working device 2. The second fluid inside the working device is a lubricating oil (density about 0.9 g/cm)3) And the third fluid external to the working device 2 is a slurry (density of about 1.2 g/cm)3) The two have a density difference. According to the technical scheme, the density difference between the inside and the outside of the working device 2 is considered, the pressure parameter obtained by detection of the detection assembly 3 is used for judging the pressure difference between the inside and the outside of the working device 2, and the pressure inside the working device 2 is actively adjusted in real time. The working device 2 has two states, the first is a working mode; the second is a state in which the operation is stopped and the fluid is lifted from the third fluid. In the working mode, depending on the working depth of the working device 2, it may or may not be necessary to replenish the first cavity 11 with the first fluid. But does not release the first fluid in the first cavity 11. If in the second state, where the working device 2 is being lifted from the third fluid, depending on the current depth of the working device 2, it may or may not be necessary to release the first fluid from the first cavity 11. However, the first cavity 11 is not replenished with the first fluid.
In some embodiments, the active pressure compensating device further comprises a power source 5 in fluid communication with the first cavity 11 for delivering a first fluid to the first cavity 11. The power source 5 is, for example, an oil pump. The power source 5 is hydraulic power which is in turn connected to the first cavity 11 by a line to charge the first cavity 11 with a first fluid.
Referring to fig. 1 and 2, in some embodiments, the power source 5 is connected to the control device 4, and the power source 5 is configured to replenish the first cavity 11 with the first fluid upon receiving an oil replenishment signal from the control device 4. The pressures inside and outside the working device 2 always satisfy the following relationship: delta P1≤ΔP＝P′-P≤ΔP2(ii) a Wherein, Δ P1And Δ P2Are both greater than 0, P' is the real-time internal pressure of the working device 2, and P is the real-time external pressure of the working device 2. The act of replenishing the first cavity 11 with the first fluid may be performed a plurality of times as the working depth increases.
Referring to fig. 1 and 2, the sensing assembly 3 is configured to sense a third fluid pressure outside the working device 2 and a second fluid pressure inside the working device 2. The detection unit 3 employs, for example, a pressure sensor or the like. Since it is necessary to detect the pressure values of the second fluid and the third fluid, the sensing assembly 3 includes a plurality of sensors, each of which is arranged in a dispersed manner to detect the pressure values at different positions. The detection component 3 may directly detect the pressure parameter of the target area (outside the working device 2), may indirectly detect the pressure parameter of the target area, and may calculate the required pressure parameter by detecting the relevant parameter.
Referring to fig. 1, 2 and 4, in some embodiments, the sensing assembly 3 includes a first sensing element 31 and a second sensing element 32. The first detection element 31 is installed inside the working device 2, and the first detection element 31 is configured to detect the second fluid pressure P' inside the working device 2. A second detecting element 32 is mounted at the electric cabinet above the working device 2, the second detecting element 32 being adapted to detect a third fluid pressure P in the environment outside the working device 21. Referring to FIG. 4, the second sensing element 32 is spaced from the top of the agitated zone during operation by a distance h0. The control device 4 is configured to determine whether to introduce the first fluid into the first cavity 11 according to the pressure difference detected by the first detection element 31 and the second detection element 32.
In the above technical solution, the first detecting element 31 directly detects the pressure parameter inside the working device 2, and the second detecting element 32 does not directly detect the pressure parameter of the target area, but converts the pressure parameter by detecting the pressure parameter located at the electric cabinet to obtain the pressure parameter outside the working device 2. The advantage of this solution is that the slurry outside the working device 2 is constantly stirred, is dynamic and, if measured directly, the measurement accuracy is to be improved. And the mud outside the electric cabinet is basically static. The inventor researches and discovers that the mud at different heights has density difference. The specific reason is because: when the working device is operated in deep water, on one hand, the density of mud outside the working device 2 is higher than that of mud outside the electric cabinet due to the deposition of mud particles, and on the other hand, the milled slag is mixed in the mud due to the fact that the working device 2 is operated in a milling mode, so that the density of the mud outside the working device 2 is further increased. The pressure value measured by the second detection element 32 is corrected in the following manner to obtain the pressure value outside the working device 2.
During operation, as the working device 2 mills and stirs the slag stones, the density of the slurry near the working device 2 is higher than that in other areas, and the height of the area is h1Density is rho1The density of the slurry in other regions is the initial density rho0。
The data acquisition and processing module of the control device 4 collects the following data: the length L of the slotted hole, the width b of the slotted hole, the current milling depth H, the depth H of footage in unit time interval, the discharge amount Q in unit time interval and the like. According to the data, the quantity Q of the slag stones milled in the unit time interval is calculated1:Q1＝Lbh。
The mass M of the slurry in this time interval is: m ═ Q1ρz+(Q-Q1)ρ0。
Where ρ iszThe density of the slag stone is, at this time, the density ρ 1 of the slurry outside the working device 2 is: ρ 1 is M/Q.
According to the technical formula, the measured value P of the pressure sensor arranged on the electric cabinet1The correction is made to obtain a third fluid pressure P outside the working device 2:
P＝P1+g(ρ0h0+ρ1h1)
wherein, P1Is the value of the pressure of the third fluid at the electric cabinet detected by the second detecting element 32. g is a constant. Rho0The density of the third fluid at the electric cabinet, namely the density of the mud in a static state. h is0The height of the second detecting element 32 from the top of the stirring area during operation; rho1Is the density value of the third fluid outside the working device 2. h is1Is the height of the agitated zone in operation, i.e. the height of the slurry agitated by the working device 2. M is the mass of the slurry discharged in a unit time interval, and Q is the volume of the slurry discharged in the unit time interval.
The above calculations may be implemented using specialized data processing and computation modules.
In some embodiments, the third fluid pressure P and the second fluid pressure P' inside the working device 2 do not satisfy the following relationship, the control device 4 issues an oil replenishment signal: delta P1≤ΔP＝P′-P≤ΔP2(ii) a Wherein, Δ P1And Δ P2Are both greater than 0.
According to the active pressure compensation device provided by the technical scheme, the data acquisition and processing device is used for acquiring each construction data, the density of the slurry (third fluid) near the working device 2 is calculated according to the data, and then the data of the pressure sensor (second detection element 32) on the electric cabinet is corrected to obtain the pressure of the slurry (third fluid) outside the working device 2. Whether oil supplementing operation is needed or not is judged by comparing the pressure relation between the inside and the outside of the working device 2, so that accurate pressure supply is carried out on the inside of the working device 2. In addition, the above method of correcting the external pressure of the working device 2 also takes into account the pressure difference caused by the different installation heights of the active pressure compensation device and the working device, so that the calculation of the external pressure of the working device 2 is more accurate.
Referring to fig. 3, further embodiments are described below.
In the case of a continuous milling down operation, the working depth of the working device 2 is increasing, in which case the pressure of the second fluid inside the working device 2 needs to be increased. In other cases, the working device 2 may be lifted out of the water, for example, when work is to be performed, or in other cases, the working depth may need to be reduced, in which case the pressure inside the working device 2 may need to be reduced. In some embodiments, the active pressure compensating device further comprises an oil drain assembly 6, the oil drain assembly 6 being in fluid communication with the first cavity 11 for releasing the first fluid in the first cavity 11. The oil discharge assembly 6, such as an oil discharge pump, releases the amount of the first fluid inside the first cavity 11 by the oil discharge pump when necessary to reduce the pressure inside the working device 2.
In some embodiments, the control device 4 is further configured to perform the following operations: before the working device 2 needs to be lifted out of the third fluid, P' > P is judged0Whether the result is true or not; if so, and the third fluid pressure P and the second fluid pressure P' inside the working device do not satisfy the following relationship: delta P1≤ΔP＝P′-P≤ΔP2The control device then sends a drain signal to release the first fluid in the first cavity 11 until P' ═ P0. Wherein P' is the second fluid pressure inside the working device 2 in real time, P0The initial pressure value set for the working device 2.
It can be seen that the active pressure compensation device that above-mentioned technical scheme provided has realized giving the pressure to the internal portion of equipment 2 accurately according to the change of working depth, can avoid on the one hand because the too big gear lubricating oil that leads to of the internal pressure of equipment 2 leaks when the little degree of depth, and on the other hand also can avoid being less than external pressure because the internal pressure of equipment 2 that height difference and density difference lead to when the big degree of depth for mud gets into inside the equipment 2.
The complete operation of the active pressure compensation device is described below.
Referring to fig. 1 to 5, at the start of operation, the control device 4 controls the amount of oil supplied from the power source to the oil converter 1 to inject the initial pressure P into the working device 20In particular P0≤ΔP2When P' ═ P0. Then, the control device 4 compares the internal pressure P' of the working device 2 with the third fluid pressure P outside the working device 2 so as to always satisfy the following relationship:ΔP1≤ΔP＝P′-P≤ΔP2. As the working depth increases, the third fluid pressure P outside the working device 2 increases, i.e. the value of Δ P decreases. When the delta P does not satisfy the above relationship, the oil supply operation of the power source 5 is triggered to give an incremental value P to the internal pressure PdWhen P' ═ P0+Pd. And the steps are repeated in sequence. Final P ═ P0+nPdAnd n is the number of triggered oil replenishing operations.
Referring to fig. 6, when the milling cutter holder is proposed after the completion of the construction, the internal pressure P' and the initial pressure P of the working device 2 at that time are first judged0The magnitude relationship. When P' ═ P0And keeping the P' unchanged until the milling cutter frame is lifted out of the water surface. When P' > P0And when the milling cutter frame is lifted. With the decreasing depth, the external pressure P is continuously decreased, i.e. the value of Δ P is continuously increased, when Δ P does not satisfy the above relationship, the oil drainage operation of the power source 5 is triggered, and a decreasing value P is given on the basis of the current internal pressure PdWhen P' ═ P0-(n-1)PdSequentially and circularly reciprocating, and finally P ═ P0. Keeping P' unchanged until the milling cutter frame is lifted out of the water surface.
According to the technical scheme, various construction data are collected and calculated through the data acquisition and processing module of the control device 4, so that the mud pressure P outside the working device 2 is obtained, and accurate pressure supply is facilitated on the basis. Through the operation, the accurate pressure supply to the inside of the working device 2 is realized, the internal pressure is always ensured to be slightly greater than the external pressure, and the normal work of the working device is ensured.
The embodiment of the invention also provides engineering machinery comprising the active pressure compensation device provided by any technical scheme of the invention.
Referring to fig. 7, an embodiment of the present invention provides an active pressure compensation method, which is implemented by using an active pressure compensation device provided in any technical solution of the present invention, and the method includes the following steps:
and S100, judging whether the difference value delta P between the third fluid pressure and the second fluid pressure is within a set range. Wherein the set range is Δ P1≤ΔP＝P′-P≤ΔP2. The third fluid pressure P and the second fluid pressure P' inside the working device 2 are both collected in real time.
Step S200, if the difference Δ P between the third fluid pressure and the second fluid pressure is within the set range, the oil supply operation is not performed to the first cavity 11.
In some embodiments, the active pressure compensation method further comprises the steps of:
step S300, if the difference Δ P between the third fluid pressure and the second fluid pressure is not within the set range, replenishing the first fluid to the first cavity 11 such that the internal pressure of the working device 2 is increased by at least one fixed value Pd，
The above steps S100 to S300 are performed in a loop to ensure that the difference Δ P between the third fluid pressure and the second fluid pressure is always within the set range.
According to the active pressure compensation method provided by the technical scheme, the internal and external pressure difference value delta P is set to be within a range; then, at the beginning of the operation, an initial pressure P is applied to the interior of the working device 20Each increment by a fixed value P with increasing depthdThe frequent oil supplementing operation is avoided, and the service life and the stability of the pressure compensation device are improved.
In some embodiments, the active pressure compensation method further comprises the steps of:
step S400, before finishing the work, judging whether the second fluid pressure P' in the real-time interior of the working device 2 is equal to the initial pressure value P of the working device 2 or not0. By this step, it is possible to know whether or not the oil replenishment operation has been performed before. If the second fluid pressure P' inside the working device 2 in real time is equal to the initial pressure value P of the working device 20It is assumed that the oil replenishing operation has not been performed before, the working device 2 is located at a shallow depth, and the pressure inside the working device 2 is not required to be reduced.
Step S500, if the second fluid pressure P' inside the working device 2 in real time is not equal to the initial pressure value P of the working device 20And the difference Δ P between the third fluid pressure and the second fluid pressure is not within the set range, the first flow in the first cavity 11 is releasedBody such that the internal pressure of the working device 2 is decreased by a fixed value Pd. Set the range to Δ P1≤ΔP＝P′-P≤ΔP2. The meanings and value ranges of the specific parameters refer to the contents introduced above, and are not described in detail here.
If the second fluid pressure P' inside the working device 2 in real time is not equal to the initial pressure value P of the working device 20But the difference Δ P between the third fluid pressure and the second fluid pressure is within a set range, the first fluid in the first cavity 11 is not released.
In some embodiments, the active pressure compensation method further comprises the steps of:
step S600 of determining that the first cavity 11 releases the first fluid and the internal pressure of the working device 2 decreases by PdThen, whether the second fluid pressure P' inside the working device 2 in real time is equal to the initial pressure value P of the working device 20。
Step S700, if the second fluid pressure P' inside the working device 2 in real time is not equal to the initial pressure value P of the working device 20And the difference Δ P between the third fluid pressure and the second fluid pressure is not within the set range, the release of the first fluid in the first cavity 11 is continued.
Repeating the steps S400 to S700 until the second fluid pressure P' in the real-time interior of the working device 2 is equal to the initial pressure value P of the working device 20。
By means of the technical scheme, the internal pressure of the working device 2 can be reduced in real time in the process of finishing work and lifting the water surface, the possibility of leakage of the second fluid from the working device 2 to the external environment is reduced, and the reliability of the product is higher.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (17)
1. An active pressure compensating device, comprising:
the oil converter (1) comprises a first cavity (11) and a second cavity (12) which are not communicated with each other; the sum of the volumes of the first cavity (11) and the second cavity (12) is determined, and the volumes of the first cavity (11) and the second cavity (12) have opposite changing trends; wherein the first cavity (11) is configured to hold a first fluid and the second cavity (12) is configured to hold a second fluid;
-a working device (2) in fluid communication with said second cavity (12); in the working mode, a third fluid is arranged outside the working device (2);
a detection assembly (3) configured to detect a third fluid pressure outside the working device (2) and a second fluid pressure inside the working device (2); and
a control device (4) in communication connection with the detection assembly (3); the control device (4) is configured to determine whether to inject the first fluid into the first cavity (11) according to a difference between the third fluid pressure and the second fluid pressure detected by the detection assembly (3).
2. The active pressure compensation device of claim 1, wherein the oil converter (1) further comprises:
a housing (13); and
a bladder (14) mounted inside the housing (13), the bladder (14) being configured to be deformable; wherein the inner cavity of the bladder (14) is the first cavity (11), the first cavity (11) being configured to hold a first fluid; the space between the inner wall of the housing (13) and the outer wall of the bladder (14) serves as a second cavity (12), the second cavity (12) being configured to hold a second fluid.
3. The active pressure compensation device of claim 1, further comprising:
a power source (5) in fluid communication with the first cavity (11) to deliver a first fluid to the first cavity (11).
4. The active pressure compensation device of claim 3, wherein the power source (5) is connected to the control device (4), the power source (5) being configured to replenish the first cavity (11) with a first fluid upon receipt of an oil replenishment signal from the control device (4).
5. The active pressure compensation device according to claim 1, characterized in that the detection assembly (3) comprises:
a first detection element (31) mounted inside the working device (2); and
a second detection element (32) mounted above the working device (2);
wherein the control device (4) is configured to determine whether to introduce the first fluid into the first cavity (11) according to the pressure difference detected by the first detection element (31) and the second detection element (32).
6. The active pressure compensation device according to claim 5, characterized in that the control device (4) is configured to calculate a third fluid pressure P outside the working device (2) according to the following formula:
P＝P1+g(ρ0h0+ρ1h1)；
ρ1＝M/Q；
M＝Q1ρz+(QQ1)ρ0；
Q1＝Lbh；
wherein, P1Is the pressure value of the third fluid at the electric cabinet detected by the second detecting element (32); g is a constant; rho0Is the density of the third fluid at the electric cabinet; h is0The height value of the second detection element (32) from the top of the stirring area during work; rho1Is the density value of a third fluid outside the working device (2); h is1The height value of the stirring area during working; m is the mass of the slurry discharged in a unit time interval, and Q is the volume of the discharged slurry in the unit time interval; q1The quantity of the slag stones milled in a unit time interval is; rhozIs the slag density; l is the length of the slotted hole; b is the width of the slot; h is the depth of penetration per unit time interval.
7. The active pressure compensation device according to claim 6, characterized in that the control device (4) issues an oil replenishment signal if the third fluid pressure P and the second fluid pressure P' inside the working device (2) do not satisfy the following relationship when the working device is in the working mode: delta P1≤ΔP＝P′-P≤ΔP2(ii) a Wherein, Δ P1And Δ P2Are both greater than 0.
8. The active pressure compensation device of claim 1, further comprising:
an oil dump assembly (6) in fluid communication with the first cavity (11) to release the first fluid in the first cavity (11).
9. The active pressure compensation device of claim 8, characterized in that the control device (4) is further configured to perform the following operations: judging P 'before the working device (2) needs to be extracted from the third fluid'>P0Whether the result is true or not; if it is trueAnd the third fluid pressure P and the second fluid pressure P' inside the working device do not satisfy the following relationship: delta P1≤ΔP＝P′-P≤ΔP2-said control device issuing a drain signal to release the first fluid in said first cavity (11) until P ═ P0(ii) a Wherein P' is a second fluid pressure inside the working device (2) in real time, P0An initial pressure value set for the working device (2).
10. The active pressure compensation device of claim 1, wherein the oil converter (1) comprises a cylinder, one of a rod chamber and a rodless chamber of the cylinder being the first cavity (11), and the other of the rod chamber and the rodless chamber of the cylinder being the second cavity (12).
11. The active pressure compensation device of claim 1, wherein the oil converter (1) is located outside the working device (2).
12. The active pressure compensation device of claim 2, wherein the material of the bladder (14) comprises rubber.
13. A two-wheel slot milling machine comprising an active pressure compensating device as claimed in any one of claims 1 to 12.
14. An active pressure compensation method, which is implemented by using the active pressure compensation device of any one of claims 1 to 12, the method comprising the steps of:
judging whether the difference value delta P between the third fluid pressure and the second fluid pressure is within a set range or not; wherein the set range is Δ P1≤ΔP＝P′-P≤ΔP2；
If the difference DeltaP between the third fluid pressure and the second fluid pressure is within a set range, the first cavity (11) is not subjected to oil supplementing operation.
15. The active pressure compensation method of claim 14, further comprising the steps of:
if the difference DeltaP between the third fluid pressure and the second fluid pressure is not within the set range, the first fluid is replenished to the first cavity (11) so that the internal pressure of the working device (2) is increased by a fixed value Pd。
16. The active pressure compensation method of claim 14, further comprising the steps of:
before finishing the work, judging whether the second fluid pressure P' inside the working device (2) in real time is equal to the initial pressure value P of the working device (2)0；
If the second fluid pressure P' inside the working device (2) in real time is not equal to the initial pressure value P of the working device (2)0And the difference Δ P between the third fluid pressure and the second fluid pressure is not within a set range, the first fluid in the first cavity (11) is released such that the internal pressure of the working device (2) is decremented by a fixed value Pd。
17. The active pressure compensation method of claim 16, further comprising the steps of:
determining that the first cavity (11) releases the first fluid and that the internal pressure of the working device (2) decreases by PdThen, whether a second fluid pressure P' inside the working device (2) in real time is equal to the initial pressure value P of the working device (2)0；
If the second fluid pressure P' inside the working device (2) in real time is not equal to the initial pressure value P of the working device (2)0And the difference delta P between the third fluid pressure and the second fluid pressure is not within a set range, the first fluid in the first cavity (11) is continuously released, so that the internal pressure of the working device (2) is decreased by a fixed value Pd；
Repeating the above steps until theThe second fluid pressure P' inside the working device (2) in real time is equal to the initial pressure value P of the working device (2)0。
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| CN202110599215.XA CN113311884A (en) | 2021-05-31 | 2021-05-31 | Active pressure compensation device and method and double-wheel slot milling machine |
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| CN202110599215.XA CN113311884A (en) | 2021-05-31 | 2021-05-31 | Active pressure compensation device and method and double-wheel slot milling machine |
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| CN108643266A (en) * | 2018-05-21 | 2018-10-12 | 徐工集团工程机械有限公司 | A kind of Double-wheel milling sounding gear |
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| CN1614160A (en) * | 2003-11-04 | 2005-05-11 | 包尔机械有限公司 | Gear unit and method for controlling an internal pressure in the gear unit |
| WO2016082356A1 (en) * | 2014-11-24 | 2016-06-02 | 徐工集团工程机械股份有限公司 | Automatic supplying pressure compensation system and control method thereof |
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