CN112832997B - Method and device for determining pumping volume of pumping equipment and pumping equipment - Google Patents
Method and device for determining pumping volume of pumping equipment and pumping equipment Download PDFInfo
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- CN112832997B CN112832997B CN202010808871.1A CN202010808871A CN112832997B CN 112832997 B CN112832997 B CN 112832997B CN 202010808871 A CN202010808871 A CN 202010808871A CN 112832997 B CN112832997 B CN 112832997B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention relates to the field of engineering machinery, and discloses a method and a device for determining the pumping volume of pumping equipment and the pumping equipment, wherein the method comprises the following steps: determining the effective stroke of the piston for each pumping; and determining the pumping amount based on the effective stroke of the piston of each pumping and the concrete cylinder area of the pumping equipment. Therefore, the technical problem of inaccurate calculation caused by the fact that the concrete cylinder cannot be filled up by pumping every time in the prior art is solved, and the accuracy of calculating the pumping volume is improved.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a method and a device for determining a pumping amount of pumping equipment and the pumping equipment.
Background
At present, pumping machines such as concrete pumps and the like generally adopt a hydraulic drive double-cylinder reciprocating piston pump, and the hydraulic drive double-cylinder reciprocating piston pump pushes two pistons to move to press and convey objects such as concrete to be conveyed by utilizing the alternate action of two concrete cylinders so as to realize the continuous conveying of the objects to be conveyed.
The pumping volume is an important data of the pumping machine and is an important basis for evaluating the performance of the pumping machine and checking the use condition of the pumping machine. The accurate pumping volume is also an important prerequisite for realizing automatic material distribution and unmanned material distribution of pumping equipment.
In the prior art, the method for determining the pumping volume is mainly determined according to the following formula:
wherein, FVolume of prescriptionThe displacement value of the piston in the pumping process is the pumping volume generated in the primary pumping process of the piston pump, D is the diameter of the concrete cylinder, and L is the displacement value of the piston in the pumping process. However, in the pumping process, the concrete cylinder cannot be filled up by pumping concrete every time, and the stroke of the pumping oil cylinder is inconsistent every time. The prior art usually adopts the formula calculation as described above, or multiplies a fixed preset suction coefficient (or filling coefficient) on the basis of the formula, and the pumping square amount is not accurately calculated.
Disclosure of Invention
It is an object of the present invention to provide a method and a device for determining a pumping volume of a pumping arrangement and a pumping arrangement, which allow solving or at least partially solving the above technical problems.
To achieve the above object, one aspect of the present invention provides a method for determining a pumping quantity of a pumping apparatus, the method comprising: determining the effective stroke of the piston for each pumping; and determining the pumping amount based on the effective stroke of the piston of each pumping and the concrete cylinder area of the pumping equipment.
Optionally, the determining the pumping amount based on the effective stroke of the piston at each pumping and the concrete cylinder area of the pumping device comprises: determining an average value of the effective piston stroke based on the effective piston stroke of each pumping; and multiplying the average value, the concrete cylinder area and the pumping times to determine the pumping amount.
Optionally, the determining the pumping amount based on the effective stroke of the piston at each pumping and the concrete cylinder area of the pumping device comprises: multiplying the effective stroke of the piston pumped each time by the area of the concrete cylinder to determine the single pumping amount; and accumulating all determined single pumping quantities to determine the pumping quantities.
Optionally, the effective piston stroke for each pumping is determined based on: the time of the piston starting to move, the time of the pumping pressure reaching a stable value, the time of the pumping completion and the theoretical stroke of the piston.
Optionally, the effective piston stroke for each pumping is determined based on: the actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value of the secondary pumping, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end of the secondary pumping and a preset material suction coefficient.
Optionally, the actual stroke is determined based on the following formula:
wherein L isjAnd for the actual stroke, K is a preset coefficient, S is the sectional area of an oil cylinder of the pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current.
Optionally, the preset coefficient is determined based on a working condition of the pumping device and a preset corresponding relationship between the working condition and the preset coefficient.
Optionally, the preset correspondence is determined based on a self-learning method.
Accordingly, another aspect of the present invention provides an apparatus for determining a pumping volume of a pumping device, the apparatus comprising: the piston effective stroke determining module is used for determining the effective stroke of the piston for each pumping; and the pumping amount determining module is used for determining the pumping amount based on the effective stroke of the piston pumped each time and the concrete cylinder area of the pumping equipment.
Optionally, the pumping volume determining module determines the pumping volume based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping device, and comprises: determining an average value of the effective piston stroke based on the effective piston stroke of each pumping; and multiplying the average value, the concrete cylinder area and the pumping times to determine the pumping amount.
Optionally, the pumping volume determining module determines the pumping volume based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping device, and comprises: multiplying the effective stroke of the piston pumped each time by the area of the concrete cylinder to determine the single pumping amount; and accumulating all determined single pumping quantities to determine the pumping quantities.
Optionally, the effective piston stroke for each pumping is determined based on: the time of the piston starting to move, the time of the pumping pressure reaching a stable value, the time of the pumping completion and the theoretical stroke of the piston.
Optionally, the effective piston stroke for each pumping is determined based on: the actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value of the secondary pumping, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end of the secondary pumping and a preset material suction coefficient.
Optionally, the actual stroke is determined based on the following formula:
wherein L isjAnd for the actual stroke, K is a preset coefficient, S is the sectional area of an oil cylinder of the pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current.
Optionally, the preset coefficient is determined based on a working condition of the pumping device and a preset corresponding relationship between the working condition and the preset coefficient.
Optionally, the preset correspondence is determined based on a self-learning method.
In addition, the invention also provides pumping equipment which comprises the device.
By the technical scheme, the pumping amount of the pumping equipment is determined based on the effective stroke of the piston and the area of the concrete cylinder, the effective stroke of the piston is the stroke of the piston under the condition that the concrete cylinder of the pumping equipment is filled, the technical problem of inaccurate calculation caused by the fact that the concrete cylinder cannot be filled by pumping every time in the prior art is solved, and the accuracy of calculating the pumping amount is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for determining a pumping volume of a pumping apparatus provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pumping system;
FIG. 3 is a schematic representation of a stroke provided by another embodiment of the present invention;
FIG. 4 is a graph of pumping pressure provided by another embodiment of the present invention;
FIG. 5 is a schematic drawing of the pumping process;
FIG. 6 is a graph of pumping pressure provided by another embodiment of the present invention; and
fig. 7 is a block diagram of an apparatus for determining a pumping amount of a pumping device according to another embodiment of the present invention.
Description of the reference numerals
1 piston effective stroke determining module and 2 pumping amount determining module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
One aspect of embodiments of the present invention provides a method for determining a pumping volume of a pumping apparatus.
Fig. 1 is a flowchart of a method for determining a pumping amount of a pumping device according to an embodiment of the present invention. Wherein a pumping system for controlling the pumping of material can be seen in figure 2. In addition, in the embodiment of the present invention, the material to be pumped may be concrete, and the pumping device may be any device capable of pumping material, such as a pump truck, a vehicle-mounted pump, a concrete pump, an injection machine, and the like.
In step S10, the effective stroke of the piston for each pumping is determined, wherein the effective stroke of the piston is the stroke of the piston when the concrete cylinder of the pumping device is filled.
In step S11, the pumping volume is determined based on the effective stroke of the piston and the concrete cylinder area of the pumping device for each pumping.
By the technical scheme, the pumping amount of the pumping equipment is determined based on the effective stroke of the piston and the area of the concrete cylinder, the effective stroke of the piston is the stroke of the piston under the condition that the concrete cylinder of the pumping equipment is filled, the technical problem of inaccurate calculation caused by the fact that the concrete cylinder cannot be filled by pumping every time in the prior art is solved, and the accuracy of calculating the pumping amount is improved.
Alternatively, in the embodiment of the present invention, the determining of the pumping amount may be determining an average value of the effective stroke of the piston based on the effective stroke of the piston for each pumping, and multiplying the average value, the area of the concrete cylinder and the pumping times to determine the pumping amount. Wherein the pumping times are the total pumping times from the time of stopping to the time of calculating the pumping amount. In particular, the formula for calculating the pumping volume may be
Wherein C is the number of times of pumpingD is the diameter of the concrete cylinder,
is the area of the concrete cylinder, LAverage outIs the average value of the effective stroke of the piston. In addition, there are many methods for calculating the average value of the effective stroke of the piston. Alternatively, several times of pumping are selected within the pumping times up to the time of calculating the pumping amount, and the average value of the effective strokes of the pistons corresponding to the selected times of pumping is calculated. For example, the pumping amount is determined for a certain time, and by the time of calculating the pumping amount, the total pumping amount is 100 times, one effective piston stroke for calculating the average value is arbitrarily selected every 10 times, and finally, the average value of all the selected effective piston strokes is obtained. Therefore, the pumping square amount is calculated by using the average value of the effective strokes of the pistons, the technical problem that the pumping square amount is not accurately calculated due to inconsistent strokes of the pumping oil cylinders at each time is solved, and the requirements of simplifying calculation and saving calculation force are met.
Optionally, in the embodiment of the present invention, the determination of the pumping amount may also be an accumulation of single pumping amounts. Specifically, single pumping amount is determined based on the effective stroke of the piston and the area of the concrete cylinder, and then all the determined single pumping amounts are accumulated to determine the pumping amount. For example, the calculation formula may be
C is the pumping frequency, D is the diameter of the concrete cylinder, LiThe piston active stroke for the ith pumping. And the accumulated single pumping amount is the pumping amount corresponding to each pumping in the total pumping times in each calculation of the pumping amount. As pumping progresses, the number of pumping times increases, and the pumping amounts accumulated in calculating the pumping amounts also increase.
Alternatively, in embodiments of the present invention, there are a wide variety of ways to determine the effective stroke of the piston per pump. For example, for a certain determined piston effective stroke, the piston effective stroke of the pumping can be determined based on the time when the piston of the pumping starts to move, the time when the pumping pressure reaches a stable value, the time when the pumping is completed and the theoretical stroke of the piston.
The determination of the effective stroke is described below by taking the pump truck pumping concrete as an example. As shown in FIG. 3, the theoretical stroke of the concrete cylinder is LTheory of the inventionWherein the theoretical stroke LTheory of the inventionThe concrete cylinder can be the inherent structural size of the concrete cylinder of each pump truck; or it may be a preset stroke of the piston that is set and the reversal is initiated when the preset stroke is reached. However, each time the concrete is pumped, the concrete cylinder is not filled, and the effective stroke is defined as the movement distance of the piston for actually compacting the concrete, that is, the effective stroke of the piston is the stroke of the piston under the condition that the concrete cylinder of the pump truck is filled, as shown by L in fig. 3Is effectiveAnd the gray part is a material, the material of the gray triangular part is not filled in the concrete cylinder, the material of the gray triangular part is equivalent to the material filled in the concrete cylinder, and the material filled in the gray part of the concrete cylinder is added, so that the effective stroke of the piston under the condition that the concrete cylinder is filled is obtained. Thus, the effective stroke LIs effectiveLess than LTheory of the inventionThis can also be seen on the basis of fig. 3.
From the pumping pressure (i.e., the pressure generated by the piston pressing the concrete) curve, the effective stroke can be calculated as shown in fig. 4.
In a single pumping cycle, the piston moves from Tmin (n-1) to Tmax (n-1) until the pumping pressure reaches a steady value, namely the piston moves in the period of Tmax (n-1) -Tmin (n-1) to compact the concrete, namely the distance can be regarded as (a small amount of concrete) without concrete, Tmin (n) is the completion time of this pumping, so the effective stroke calculation formula is as follows: l isIs effective＝(Tmin(n)-Tmax(n-1))/(Tmin(n)-Tmin(n-1))*LTheory of the invention，LIs effectiveFor an effective stroke, LTheory of the inventionIs a theoretical stroke.
Preferably, in the embodiment of the invention, a preset material suction coefficient can be further considered during the effective stroke, so that the calculated effective stroke is more accurate. In particular, LIs effective＝((Tmin(n)-Tmax(n-1))+(Tmax(n-1)-Tmin(n-1))*k1)/(Tmin(n)-Tmin(n-1))*LTheory of the inventionAnd k1 is a first preset suction coefficient. Preferably, k1 may be around 0.5, e.g. between 0.4 and 0.6.
Optionally, in an embodiment of the present invention, the effective stroke of the piston for each pumping may also be determined based on: the actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value of the secondary pumping, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end of the secondary pumping and a preset material suction coefficient.
Wherein, the effective stroke of the piston for each pumping is calculated as follows: and calculating the product of the actual stroke of the piston from the beginning of pumping to the stable value of the pumping pressure and a preset material suction coefficient, and adding the actual stroke of the piston from the stable value of the pumping pressure to the end of pumping. As shown in fig. 5, the amount of material sucked (degree of filling) during the pumping process of the pumping equipment is mainly affected by the following three factors: 1) the amount of concrete in the hopper (the material level is high or low), when the material level is too low and the concrete cylinder sucks the material, a part of the concrete cylinder sucks the air, and the material sucking capacity cannot be fully exerted, as shown in fig. 5; 2) the quantity of the absorbed materials is related to the fluidity of the concrete material, the fluidity is good, and the absorbed materials are more; 3) the method is related to the homogeneity of concrete materials, and the homogeneity is good, namely, the gaps among the materials uniformly distributed among the concrete aggregates are less, and the material absorption is more. The process from the pumping starting point to the pumping pressure stabilizing point truly reflects the process from concrete material suction to concrete compaction, so that the product of the actual stroke of the piston from the pumping starting point to the pumping pressure reaching the stabilizing value and the preset material suction coefficient can more accurately reflect the filling degree of the material in the pumping process of the concrete cylinder. In the prior art, the scheme of multiplying the piston stroke from the beginning to the end of pumping by the material suction coefficient cannot accurately reflect the filling degree of the material. The inconsistent stroke of the piston from the pumping start to the pumping end of each pumping is mainly influenced by the leakage amount of the hydraulic oil between the piston of the pumping oil cylinder and the cylinder barrel of the oil cylinder, and is irrelevant to the material filling degree in the pumping process.
In addition, the actual stroke of the piston from the beginning of pumping to the stable pumping pressure can be obtained by subtracting the actual stroke of the piston from the beginning to the end of pumping to the stable pumping pressure, and the effective stroke of the piston for each pumping can be obtained by the actual stroke of the piston from the beginning to the end of pumpingThe stroke, the actual stroke from the time that the pumping pressure reaches a stable value to the time that the pumping is finished and the preset material suction coefficient are obtained, wherein the actual stroke can be obtained through direct detection. For example, as shown in FIG. 6, the actual stroke L from Tmax (n-1) (pressure reached steady value) to Tmin (n) (end of pumping) during the i-th pumping is determinedi minAnd an actual stroke L of Tmin (n-1) (start of pumping) to Tmin (n)imaxThe effective stroke L of the piston per pumpingiIs Li＝Limin+(Limax-Limin)×k2Wherein k is2The second predetermined draw-off factor is typically about 0.5, for example between 0.4 and 0.6. In addition, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end can be obtained by subtracting the actual stroke of the piston from the pumping start to the pumping end from the actual stroke of the piston from the pumping start to the pumping end, so that the effective stroke of the piston for each pumping can be obtained by the actual stroke of the piston from the pumping start to the pumping end, the actual stroke of the piston from the pumping start to the pumping pressure reaching the stable value and the preset material sucking coefficient.
The two methods for determining the effective stroke of the piston introduced in the embodiment of the invention are to calculate the stroke of each pumping piston by using the theoretical stroke of the piston and calculate the actual stroke of each pumping piston. The first calculation method simplifies the calculated amount, and the second calculation method improves the measurement accuracy of the square amount. Based on the requirements of automation and unmanned operation of equipment, the formula calculation is usually required to be accurate, and the second scheme (calculating the effective stroke of the piston by adopting the actual stroke) can better meet the requirements.
In the embodiment of the present invention, the actual stroke may be directly obtained through detection. Specifically, a cylinder piston stroke detection device, such as a hysteresis expansion sensor, is added, and the actual stroke of the piston from the beginning to the end and the actual stroke from the stable value of the pumping pressure to the end can be detected by combining the pumping pressure.
Furthermore, the actual stroke may also be determined based on an integral of the speed of movement of the piston. Specifically, the following is referred to.
Based on oil pump rowAnd (3) establishing a piston stroke calculation model of the hydraulic cylinder by using the quantity, the rotating speed of the oil pump/the rotating speed of the engine and the structural parameters of the oil cylinder. The calculation method is applied to the pumping mechanism, and the actual stroke L of the piston is calculated in real time through a piston stroke calculation modelj。
The piston in the hydraulic cylinder is pushed by hydraulic oil, the speed of the piston is the flow speed of the hydraulic oil, and the flow speed is equal to the flow rate of the hydraulic oil/the sectional area of the oil cylinder. One specific example of a flow rate is as follows. VsAccording to the parameters of oil pump rotating speed/engine rotating speed N and displacement current/directly determined displacement current, obtaining the piston motion speed model
The method comprises the following steps of obtaining a displacement current of the pumping equipment, wherein K is a preset coefficient, S is the sectional area of an oil cylinder of the pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current. For example, the parameter related to the displacement current may be an oil pump opening or a proportional valve opening that affects the oil pump opening. Piston stroke, i.e. integrating the speed of movement, i.e. piston stroke calculation model
For a certain pumping, as shown in FIG. 6, Tmin (n-1) is the starting point for the piston to begin moving; the end point tmin (n) is the starting point for the next time the piston starts to move, this starting point being known from the control system (in particular by the energization of the solenoid valve controlling the movement of the piston); tmax (n-1) the point at which the pumping pressure reaches a plateau. A stroke of Tmax (n-1) to Tmin (n)
Tmin (n-1) to Tmin (n)
In addition, the point at which the pumping pressure reaches a plateau value can be determined by detecting the pressure level reaching a set value range. However, since the pressure values under different conditions are different, it is inconvenient to detect the pressure value to reach the set value range, and the pressure value needs to be set for different conditions. More preferably, the present application determines the point at which the pumping pressure reaches a steady value by detecting the rate of change of the pressure, that is, by determining the slope of the pressure curve (the pressure curve is a fitted curve obtained by collecting pressure values at a plurality of time instants), and specifically, when the rate of change of the pressure tends to 0 (which may be a certain set interval close to 0), the pressure reaches a steady state. It is understood that, when the rate of change of the pressure is detected, the rate of change of the pressure in the plurality of zones may be selected, and when the rates of change of the pressure in the plurality of zones simultaneously tend to 0, it is confirmed that the pressure reaches a steady state. It should be noted that, the above-mentioned obtaining of the pressure or the pressure change rate may also perform a removing and denoising process on the abnormal value. In addition, in the present application, fitting the curve may be performed by a least squares method. The principle of least squares is to find a best fit curve with the least sum of squares of the differences (i.e., deviations) between each measurement and the corresponding point on the curve. Of course, the invention can also adopt other methods of fitting curves which are common in the prior art, and the least square method is more convenient for calculation.
In the formula
And S represents the sectional area of the oil cylinder, N represents the rotating speed of the oil pump/the rotating speed of the engine, I represents the displacement current, and K represents a preset coefficient. The preset coefficient K may be determined based on the working condition of the pumping device and a preset corresponding relationship between the working condition and the preset coefficient. The preset coefficient K may be determined by the type of main oil pump of the pumping apparatus.
In the embodiment of the present invention, as an alternative, the selection of the K coefficient may also be preset when the equipment is shipped from a factory according to different working conditions of a test. That is, the preset coefficients K corresponding to different working conditions are obtained by testing different working conditions, so as to obtain the preset corresponding relationship between the working conditions and the preset coefficients, and the preset coefficients are preset when the factory leaves the factory. And in the pumping process, determining a preset coefficient corresponding to the actual working condition according to the actual working condition of the pumping equipment and a preset corresponding relation.
In addition, the preset corresponding relation between the working condition and the preset coefficient K can be determined through a self-learning method, and the preset corresponding relation is obtained through self-learning according to the actual working condition parameters in the actual pumping process.
Specifically, the self-learning method learns based on an online network. The function selection switch works in a learning mode, and when the hydraulic cylinder piston stroke detection device is not in fault, the detection device acquires actual strokes under different working conditions in the working process in real time, namely the method for directly detecting the actual strokes is adopted to detect the actual strokes under different working conditions. Continuously adjusting and optimizing stroke model coefficients (namely, preset coefficients K) according to actual strokes under different working conditions to obtain corresponding relations between the stroke model coefficients under different working conditions and the working conditions, namely, obtaining the preset corresponding relations in the embodiment of the invention, and storing the stroke model coefficients under different working conditions in a network (namely, storing the preset corresponding relations in the network); the selection switch works in a stroke calculation mode, and the optimal stroke model coefficient is adjusted according to different working conditions, and the calculation model is utilized to complete the calculation and output of the piston stroke.
The coefficient K is preset by self-learning or before leaving factory, and is selected by calculating Li maxOptimized by continuous comparison with the stroke detected by the piston stroke detecting means, e.g. Li maxIf the calculated result is less than the detected stroke, the K value is increased and the next calculation is carried out again to obtain the calculated Li maxAnd continuously approaching the stroke detected by the stroke detection device.
It should be noted that the preset corresponding relationship between the working condition and the preset coefficient K obtained by the self-learning method can also be applied to some pumping devices without stroke detection function. For example, the stroke of each time is represented by the formula
The preset coefficient K is selected, the stroke calculated based on the formula can be applied to the method for determining the pumping amount of the pumping method in the embodiment of the invention through a plurality of tests to determine the pumping amount, and the method for determining the pumping amount of the pumping method can determine the pumping amountThe pumping amount of the concrete is compared with the pumping amount obtained by measuring the concrete actually pumped out by the pumping equipment to obtain a preset coefficient K, and then the preset corresponding relation between the working condition and the preset coefficient K is determined.
In addition, according to the pumping amount calculation method provided by the embodiment of the invention, a pumping quantitative control method can be obtained, a pumping target amount is preset, the pumping amount is calculated in real time according to the pumping amount calculation method in the embodiment, and pumping is stopped when the calculated pumping amount reaches the pumping target amount.
In the application, the condition that the concrete cylinder is not filled with the material in each pumping process is considered during the calculation of the pumping volume, and the method is different from the simple method of multiplying a material suction coefficient in the prior art, the detection on the pumping pressure and the pressure change rate is combined in the application, the different conditions that the concrete cylinder is not filled in each pumping process are considered (namely, the time that the concrete cylinder is not filled is obtained by obtaining the pumping starting point and the pressure stable point), the condition that the concrete cylinder is not filled in is considered in the application, and the different pumping strokes and the different filling degrees of each pumping process are dynamically considered. The formula calculation of the present application is more accurate than the prior art.
Accordingly, another aspect of the embodiments of the present invention also provides an apparatus for determining a pumping amount of a pumping device.
Fig. 7 is a block diagram of an apparatus for determining a pumping amount of a pumping device according to another embodiment of the present invention. As shown in fig. 7, the apparatus includes a piston effective stroke determining module 1 and a pumping volume determining module 2. The effective piston stroke determining module 1 is used for determining the effective piston stroke of each pumping; the pumping amount determining module 2 is used for determining the pumping amount based on the effective stroke of the piston of each pumping and the concrete cylinder area of the pumping equipment.
Optionally, in this embodiment of the present invention, the determining the pumping amount by the pumping amount determining module based on the effective stroke of the piston at each pumping and the area of the concrete cylinder of the pumping device includes: determining an average value of the effective strokes of the pistons based on the effective strokes of the pistons for each pumping; and multiplying the average value, the area of the concrete cylinder and the pumping times to determine the pumping amount.
Optionally, in this embodiment of the present invention, the determining the pumping amount by the pumping amount determining module based on the effective stroke of the piston at each pumping and the area of the concrete cylinder of the pumping device includes: multiplying the effective stroke of the piston pumped each time by the area of the concrete cylinder to determine the single pumping amount; and accumulating all the determined single pumping quantities to determine the pumping quantities.
Optionally, in an embodiment of the present invention, the effective stroke of the piston for each pumping is determined based on: the time of the piston starting to move, the time of the pumping pressure reaching a stable value, the time of the pumping completion and the theoretical stroke of the piston.
Optionally, in an embodiment of the present invention, the effective stroke of the piston for each pumping is determined based on: the actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value of the secondary pumping, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end of the secondary pumping and a preset material suction coefficient.
Optionally, in an embodiment of the present invention, the actual stroke is determined based on the following formula:
wherein L isjThe method comprises the following steps that K is a preset coefficient, S is the sectional area of an oil cylinder of pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current.
Optionally, in the embodiment of the present invention, the preset coefficient is determined based on the working condition of the pumping device and a preset corresponding relationship between the working condition and the preset coefficient.
Optionally, in the embodiment of the present invention, the preset correspondence is determined based on a self-learning method.
The specific working principle and the benefits of the device for determining the pumping amount of the pumping equipment provided by the embodiment of the invention are similar to those of the method for determining the pumping amount of the pumping equipment provided by the embodiment of the invention, and the detailed description is omitted here.
In addition, another aspect of the embodiments of the present invention further provides a pumping device, which is the apparatus described in the above embodiments.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (13)
1. A method for determining a pumping volume of a pumping apparatus, the method comprising:
determining the effective stroke of the piston for each pumping; and
determining the pumping amount based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping equipment,
wherein the effective piston stroke for each pumping is determined based on:
the time when the secondary pumped piston starts to move, the time when the pumping pressure reaches a stable value, the time when the pumping is finished and the theoretical stroke of the piston, wherein LIs effective＝((Tmin(n)-Tmax(n-1))+(Tmax(n-1)-Tmin(n-1))*k1)/(Tmin(n)-Tmin(n-1))*LTheory of the invention，LIs effectiveFor the effective stroke of the piston per pump, LTheory of the inventionFor a theoretical stroke of the piston, Tmin (n-1) is the time at which the piston of the secondary pump begins to move, Tmax (n-1) is the time at which the pumping pressure of the secondary pump reaches a steady value, Tmin (n) is the time at which the pumping of the secondary pump is complete, and k is1 is a first preset material absorption coefficient, and the value range of k1 is 0.4-0.6; or
The actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end, and a second preset material suction coefficient, wherein the second preset material suction coefficient is used for reflecting the filling degree of the pumped object in the pumping process,
wherein the effective stroke of the piston per pumping is Li＝Limin+(Limax-Limin)×k2Wherein k is2For the second predetermined suction coefficient, k2The value range of (A) is 0.4-0.6; l isi minThe actual stroke of the piston from the time the pumping pressure reaches a steady value to the end of pumping for that pumping; l is a radical of an alcoholi maxThe actual stroke of the piston from the beginning of pumping to the end of pumping for this pump.
2. The method of claim 1, wherein the determining the pumping volume based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping apparatus comprises:
determining an average value of the effective piston stroke based on the effective piston stroke of each pumping; and
and multiplying the average value, the concrete cylinder area and the pumping times to determine the pumping amount.
3. The method of claim 1, wherein the determining the pumping volume based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping apparatus comprises:
multiplying the effective stroke of the piston pumped each time by the area of the concrete cylinder to determine the single pumping amount; and
and accumulating all the determined single pumping quantities to determine the pumping quantities.
4. The method according to claim 1, wherein in the case that the effective stroke of the piston for each pumping is determined based on the actual stroke of the piston from the start of pumping to the time when the pumping pressure reaches a stable value, the actual stroke of the piston from the time when the pumping pressure reaches a stable value to the end of pumping, and the second preset suction coefficient, the actual stroke is determined based on the following formula:
wherein L isjAnd for the actual stroke, K is a preset coefficient, S is the sectional area of an oil cylinder of the pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current.
5. The method of claim 4, wherein the predetermined coefficient is determined based on a condition of the pumping apparatus and a predetermined correspondence of the condition to the predetermined coefficient.
6. The method according to claim 5, characterized in that the preset correspondence is determined based on a self-learning method.
7. An apparatus for determining a pumping volume of a pumping device, the apparatus comprising:
the piston effective stroke determining module is used for determining the effective stroke of the piston for each pumping; and
the pumping amount determining module is used for determining the pumping amount based on the effective stroke of the piston pumped each time and the concrete cylinder area of the pumping equipment,
wherein the effective stroke of the piston for each pumping is determined based on:
the time when the secondary pumped piston starts to move, the time when the pumping pressure reaches a stable value, the time when the pumping is finished and the theoretical stroke of the piston, wherein LIs effective＝((Tmin(n)-Tmax(n-1))+(Tmax(n-1)-Tmin(n-1))*k1)/(Tmin(n)-Tmin(n-1))*LTheory of the invention，LIs effectiveFor the effective stroke of the piston per pump, LTheory of the inventionFor the theoretical stroke of the piston, Tmin (n-1) is the time for the piston of the secondary pumping to start moving, Tmax (n-1) is the time for the pumping pressure of the secondary pumping to reach a stable value, Tmin (n) is the time for the pumping of the secondary pumping to be completed, k1 is a first preset material suction coefficient, and the value range of k1 is 0.4-0.6; or
The actual stroke of the piston from the pumping start to the pumping pressure reaching a stable value, the actual stroke of the piston from the pumping pressure reaching the stable value to the pumping end, and a second preset material suction coefficient, wherein the second preset material suction coefficient is used for reflecting the filling degree of the pumped object in the pumping process,
wherein the effective stroke of the piston per pumping is Li＝Limin+(Limax-Limin)×k2Wherein k is2For the second predetermined suction coefficient, k2The value range of (A) is 0.4-0.6; l isi minThe actual stroke of the piston from the time the pumping pressure reaches a steady value to the end of pumping for that pumping; l isi maxThe actual stroke of the piston from the beginning of pumping to the end of pumping for this pump.
8. The apparatus of claim 7, wherein the pumping volume determination module determines the pumping volume based on the effective stroke of the piston for each pumping and the concrete cylinder area of the pumping device comprises:
determining an average value of the effective piston stroke based on the effective piston stroke of each pumping; and
and multiplying the average value, the concrete cylinder area and the pumping times to determine the pumping amount.
9. The apparatus of claim 7, wherein the pumping volume determination module determines the pumping volume based on an effective stroke of a piston per pump and a cylinder area of the pumping device comprises:
multiplying the effective stroke of the piston pumped each time by the area of the concrete cylinder to determine the single pumping amount; and
and accumulating all the determined single pumping quantities to determine the pumping quantities.
10. The apparatus of claim 7, wherein in the case that the effective stroke of the piston for each pumping is determined based on the actual stroke of the piston from the start of pumping to the point where the pumping pressure reaches a stable value, the actual stroke of the piston from the point where the pumping pressure reaches a stable value to the point where the pumping ends, and the second predetermined suction coefficient, the actual strokes are determined based on the following formula:
wherein L isjAnd for the actual stroke, K is a preset coefficient, S is the sectional area of an oil cylinder of the pumping equipment, N is the oil pump rotating speed or the engine rotating speed of the pumping equipment, and I is the displacement current of the pumping equipment or a parameter related to the displacement current.
11. The apparatus of claim 10, wherein the predetermined coefficient is determined based on a condition of the pumping device and a predetermined correspondence of the condition to the predetermined coefficient.
12. The apparatus of claim 11, wherein the preset correspondence is determined based on a self-learning method.
13. A pumping apparatus, characterized in that it comprises a device according to any one of claims 7-12.
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| IT977952B (en) * | 1972-06-21 | 1974-09-20 | Poulten J Ltd | CYLINDER AND PLUNGER DEVICE FOR FILLING AND EMPTYING CONTAINERS ESPECIALLY OF PI PETTE |
| DE2559761A1 (en) * | 1974-06-03 | 1977-11-03 | Georgia Pacific Corp | LIQUID DISPENSER |
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2020
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| IT977952B (en) * | 1972-06-21 | 1974-09-20 | Poulten J Ltd | CYLINDER AND PLUNGER DEVICE FOR FILLING AND EMPTYING CONTAINERS ESPECIALLY OF PI PETTE |
| DE2559761A1 (en) * | 1974-06-03 | 1977-11-03 | Georgia Pacific Corp | LIQUID DISPENSER |
| CN1975165A (en) * | 2006-12-07 | 2007-06-06 | 浙江大学 | Concrete pump displacement measuring method and apparatus thereof |
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| CN103389686A (en) * | 2012-04-01 | 2013-11-13 | 北汽福田汽车股份有限公司 | Method for controlling pump truck and pump truck |
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