CN112518972B - Calculation method for spiral conveying amount of precast concrete cloth - Google Patents

Calculation method for spiral conveying amount of precast concrete cloth Download PDF

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CN112518972B
CN112518972B CN202011138443.9A CN202011138443A CN112518972B CN 112518972 B CN112518972 B CN 112518972B CN 202011138443 A CN202011138443 A CN 202011138443A CN 112518972 B CN112518972 B CN 112518972B
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spiral
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conveying channel
spiral conveying
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CN112518972A (en
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李冬
周鹏
郭菁菁
张亚欣
张珂
吴玉厚
于文达
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Shenyang Jianzhu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/408—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by data handling or data format, e.g. reading, buffering or conversion of data
    • G05B19/4086—Coordinate conversions; Other special calculations

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Abstract

The invention discloses a method for calculating the spiral conveying capacity of precast concrete distribution, based on the energy conversion relational expression of the spiral conveying concrete, calculating the mechanical energy output by a spiral driving motor according to the output energy consumption when a direct current motor drives a load, calculating the spiral mechanical energy of the spiral driving motor according to the output energy consumption when the direct current motor is idle, calculating the concrete internal energy according to the friction force between the concrete and a spiral blade when the concrete moves towards the outlet of a conveying channel and the friction force generated by the inner wall of the conveying channel respectively, calculating the concrete internal energy, calculating the spiral conveying capacity of a high-precision distributor according to the axial movement kinetic energy and the rotation kinetic energy generated by the spiral extrusion of the concrete and the concrete kinetic energy, considering the mechanical energy consumption output by the spiral driving motor when the concrete is conveyed spirally, calculating the spiral conveying capacity of the distributor according to the mass relation between the energy conversion relational expression and the concrete conveyed by the distributor, the calculation accuracy of the screw conveying amount is improved.

Description

Calculation method for spiral conveying amount of precast concrete cloth
Technical Field
The invention belongs to the technical field of automatic control of concrete distributing machines, and particularly relates to a calculation method for spiral conveying capacity of concrete distribution of prefabricated parts.
Background
The distribution of the concrete of the prefabricated part is an important process link of the industrial production line of the prefabricated part, a spiral distributing machine is mainly adopted in the process, the concrete in a hopper is poured into a mold according to requirements, and the working performance of the distribution machine directly influences the product quality of the prefabricated part. Along with the continuous deepening of assembled building development, the current production mode that manual control concrete spreader pour prefabricated component has can't satisfy industry development demand, and the industry is more and more urgent to the concrete spreader demand of digital automatic pouring.
The traditional screw conveying quantity mechanism model is too simple, the process condition in the screw conveying material process is not completely described, so that the difference between the calculated forecast value of the conveying quantity and the actual value is large, the target value given forecast for distributing weight control cannot be used, and the realization of automatic control of the concrete distributing weight is limited.
Due to the lack of a calculation model of a high-precision spiral conveying quantity forecast value, the concrete distribution weight automatic control system cannot obtain an accurate target forecast value, the realization of the concrete distribution weight automatic control function is severely restricted, and the weight precision of the current precast concrete component product is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a calculation method of the spiral conveying capacity of the concrete distribution of the prefabricated part, so as to improve the forecast precision of the spiral conveying capacity of the concrete distribution machine, and provide an accurate target forecast value for a concrete distribution weight control system.
The invention provides a method for calculating the spiral conveying amount of concrete cloth of a prefabricated part, which is characterized by comprising the following steps of:
calculating mechanical energy W output by the spiral driving motor according to the output energy consumption when the direct current motor drives the load;
calculating the spiral mechanical energy W of the spiral driving motor according to the output energy consumption of the DC motor in no-load0；
Calculating the internal energy E of the concrete according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectivelyu；
According to the energy conversion relation W ═ W of the spiral conveying concreteO+EP+EuCalculating concrete kinetic energy Ep；
According to the axial movement kinetic energy and the rotation kinetic energy generated by the screw extrusion of the concrete and the concrete kinetic energy EpCalculating the screw conveying capacity Q of the material distributorn。
Further, according to the output energy consumption when the dc motor drives the load, a calculation formula used when calculating the mechanical energy W output by the screw driving motor includes:
W＝UIt-I2Rt
wherein U, I, R and t are the voltage, coil current, coil resistance and run time of the screw drive motor, in that order.
Further, according to the output energy consumption of the DC motor in no-load, the spiral mechanical energy W of the spiral driving motor0The calculation formula used in the calculation comprises:
Figure BDA0002737502000000021
in the formula of U0、I0The voltage and the current of the spiral driving motor in no-load are respectively, R is coil resistance, and t is running time.
Furthermore, according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectively, the internal energy E of the concrete is measureduThe calculation formula used in the calculation comprises:
Eu＝Pft＝(P1+P2)t
in the formula, PfConsuming power for concrete friction; p1And P2The power consumed by friction between the concrete and the inner wall of the spiral conveying channel and the spiral is respectively.
Further, the power P consumed in the friction between the concrete and the inner wall of the spiral conveying channel1When the calculation is carried out, the method comprises the following steps:
according to the calculation formula P1＝F1lVz＝NμlVzCalculating the friction power consumption P between the concrete and the inner wall of the spiral conveying channel1；
In the formula, F1Is the friction between the concrete in unit length and the inner wall of the spiral conveying channel; n is the pressure of concrete in unit length on the inner wall of the spiral conveying channel; mu is the friction coefficient between the concrete and the inner wall of the spiral conveying channel; l is the conveying length of the concrete in the inner wall of the spiral conveying channel, VzThe screw axial speed angle speed.
Further, when calculating the power consumed by friction between the concrete and the inner wall of the spiral conveying channel, the method comprises the following steps:
gaps between concrete particles are ignored, and the concrete in the spiral conveying channel is assumed to be approximately liquid, so that the concrete is fully contacted with the inner wall of the conveying channel in the filling range of the conveying channel.
Further, when calculating the power consumed by friction between the concrete and the inner wall of the spiral conveying channel, the method further comprises the following steps:
according to the radial sectional area A and the material stacking height h of the concrete in the spiral conveying channel, a formula N is calculated1Calculating the pressure of concrete per unit length on the bottom surface of the spiral conveying channel by adopting a calculation formula
Figure BDA0002737502000000031
Calculating the side pressure of concrete in unit length to the spiral conveying channel, wherein rho is the bulk density of the material; g is the acceleration of gravity; a and h are respectively the radial section area and the material stacking height of the concrete in the spiral conveying channel; kSide wallIs a lateral pressure coefficient;
according to the calculation formula N ═ N1+2N2And calculating the pressure of the concrete in unit length on the inner wall of the spiral conveying channel.
Further, the power P consumed for friction generated between the concrete and the helical blade2When the calculation is carried out, the method comprises the following steps:
calculating the power consumed by friction generated between the concrete and the helical blade according to the interaction force relationship between the concrete and the helical blade, wherein the calculation formula is as follows:
Figure BDA0002737502000000041
in the formula, F2Is the friction between the concrete and the helical blade, and beta is the helix angle.
Another aspect of the present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the method for calculating a screw conveying amount for a precast member concrete cloth described above.
The invention further provides a device for calculating the spiral conveying amount of the precast concrete cloth material, which comprises a storage medium, a processor and a computer program stored on the storage medium and capable of running on the processor, wherein the processor executes the program to realize the method for calculating the spiral conveying amount of the precast concrete cloth material.
The invention provides a calculation method of spiral conveying capacity for precast concrete distribution, which is based on an energy conversion relational expression W (W-W) of spiral conveying concreteO+EP+EuCalculating the mechanical energy W output by the screw driving motor according to the output energy consumption when the DC motor drives the load, and calculating the screw mechanical energy W of the screw driving motor according to the output energy consumption when the DC motor is in no load0And calculating the internal energy E of the concrete according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectivelyuCalculating the internal energy E of concreteuThen according to the axial movement kinetic energy and rotation kinetic energy produced by the screw extrusion action of concrete and concrete kinetic energy EpCalculating the high-precision spiral conveying quantity Q of the distributing machinenThe method provided by the invention considers the mechanical energy consumption output by the spiral driving motor when the concrete is conveyed in a spiral manner, and then carries out spiral conveying quantity Q of the distributing machine through the energy conversion relational expression and the mass relation of the concrete conveyed by the distributing machinenAnd calculating to improve the calculation precision of the spiral conveying amount, wherein the calculated value can be used as a target forecast value of the automatic cloth weight control system, and the stable operation of the automatic weight control system is facilitated.
Drawings
FIG. 1 is a schematic view of a spiral concrete spreader production process;
fig. 2 is a schematic flowchart of a method for calculating a screw conveying amount of a precast concrete cloth according to an exemplary embodiment of the present invention;
fig. 3 is a schematic flowchart of another method for calculating the spiral conveying amount of the precast concrete cloth according to an exemplary embodiment of the present invention;
FIG. 4 is a graph of the relationship between parameters of concrete and helical blade friction;
FIG. 5 is a schematic diagram of energy conversion during screw conveying of materials.
In the figure, 1-a material distributor control cabinet, 2-a material distributor cart, 3-a material distributor trolley, 4-a material distributor hopper, 5-a scattering rod, 6-a spiral driving motor, 7-a spiral, 8-a discharge gate, 9-a bottom die tray, 10-a precast concrete member side die and 11-a walking beam bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, a schematic diagram of a pouring production process of a precast concrete member of an adopted spiral material distributor is shown in fig. 1.
Therefore, the volume of concrete passing through the cross section of the outlet of the distributing opening in unit time of the spiral distributing machine in the prior art is the spiral conveying amount, and the formula Q ═ S rho V is generally adopted in the industryZCalculating the spiral conveying amount, wherein: q is the spiral conveying capacity of the distributing machine, kg/s; s is the cross-sectional area of the concrete layer in the screw rod, m2(ii) a Rho is the bulk density of the concrete, kg/m3；VzIs the axial conveying speed of the concrete in the screw rod, m/s.
Because, the area S of the bed of material cross section of spiral cloth machine is:
Figure BDA0002737502000000051
in the formula: d is the diameter of the helical blade m; d is the diameter of the spiral shaft, m; Ψ is a fill factor; c is a tilt correction coefficient. Therefore, when the screw delivery model with the traditional mechanism is adopted to forecast the delivery,the calculation formula is
Figure BDA0002737502000000061
In the formula, phi is the filling rate, S is the helical pitch, n is the helical number of turns, rho is the density of the concrete, D is the external diameter of the helix, and D is the internal diameter of the helix.
Due to VzCan be calculated as
Figure BDA0002737502000000062
Expressed, in the formula: p is the pitch, m; n is the screw revolution, r/min; therefore, the calculation formula of the traditional mechanism model of the spiral conveying capacity of the distributing machine obtained by calculation is as follows
Figure BDA0002737502000000063
Because the traditional material distributor screw conveying capacity mechanism model adopts an empirical interval parameter method to approximately describe the screw conveying process state, the calculation accuracy of the screw conveying capacity is low, and therefore, the deviation is increased after the weight target value is formed by accumulation, and finally the requirement of the automatic control and the accurate operation of the concrete material distribution weight on the weight forecast target value cannot be met. In addition, the traditional screw conveying quantity mechanism model is too simple, so that the process condition in the screw conveying material process is not completely described, the difference between the calculated predicted value and the actual value of the conveying quantity is large, the target value given prediction for material distribution weight control cannot be used, and the realization of automatic control of the concrete material distribution weight is limited.
Because of the lack of a calculation model of a high-precision screw conveying quantity forecast value, the automatic control system of the concrete distribution weight cannot obtain an accurate target forecast value, and the realization of the automatic control function of the concrete distribution weight is severely restricted, so that the weight precision of the current precast concrete component product is low. Therefore, the invention aims to improve the forecasting precision of the spiral conveying capacity of the concrete distributing machine, thereby providing an accurate target forecasting value for a concrete distributing weight control system.
In one aspect, the present invention provides a method for calculating a spiral conveying amount of a concrete cloth for a prefabricated part, referring to fig. 2, including:
and S100, calculating mechanical energy W output by the spiral driving motor according to the output energy consumption when the direct current motor drives the load.
When step S100 is executed to calculate the mechanical energy W output by the screw driving motor according to the energy consumption output by the dc motor when the load is driven, the calculation formula includes:
W＝UIt-I2Rt
wherein U, I, R and t are the voltage, coil current, coil resistance and run time of the screw drive motor, in that order.
S200, calculating spiral mechanical energy W of the spiral driving motor according to the output energy consumption of the direct current motor in no-load state0。
In the step S200, according to the output energy consumption of the DC motor during no-load, the spiral mechanical energy W of the spiral driving motor is0The calculation formula used in the calculation comprises:
Figure BDA0002737502000000071
in the formula of U0、I0The voltage and the current of the spiral driving motor in no-load are respectively, R is coil resistance, and t is running time.
S300, calculating the internal energy E of the concrete according to the friction force generated by the concrete when moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectivelyu。
The step S300 is executed according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectively to the internal energy E of the concreteuThe calculation formula used in the calculation comprises:
Eu＝Pft＝(P1+P2)t
in the formula, PfConsuming power for concrete friction; p1And P2The power consumed by friction between the concrete and the inner wall of the spiral conveying channel and the spiral is respectively.
Further, the power P consumed in the friction between the concrete and the inner wall of the spiral conveying channel1When the calculation is carried out, the method comprises the following steps:
according to the calculation formula P1＝F1lVz＝NμlVzCalculating the friction power consumption P between the concrete and the inner wall of the spiral conveying channel1；
In the formula, F1Is the friction between the concrete in unit length and the inner wall of the spiral conveying channel; n is the pressure of concrete in unit length on the inner wall of the spiral conveying channel; mu is the friction coefficient between the concrete and the inner wall of the spiral conveying channel; l is the conveying length of the concrete in the inner wall of the spiral conveying channel, VzThe screw axial speed angle speed.
The method comprises the following steps of when calculating the power consumed by friction between concrete and the inner wall of the spiral conveying channel:
gaps between concrete particles are ignored, and the concrete in the spiral conveying channel is assumed to be approximately liquid, so that the concrete is fully contacted with the inner wall of the conveying channel in the filling range of the conveying channel.
Further, the power P consumed by friction between the concrete and the inner wall of the spiral conveying channel is calculated1Referring to fig. 3, the method further includes:
s301, according to the radial sectional area A and the material stacking height h of the concrete in the spiral conveying channel, calculating a formula N1Calculating the pressure of concrete per unit length on the bottom surface of the spiral conveying channel by adopting a calculation formula
Figure BDA0002737502000000081
Calculating the side pressure of concrete in unit length to the spiral conveying channel, wherein rho is the bulk density of the material; g is the acceleration of gravity; a and h are respectively the radial section area and the material stacking height of the concrete in the spiral conveying channel; kSide wallIs a lateral pressure coefficient;
wherein the calculation formula of the radial sectional area A is
Figure BDA0002737502000000082
The calculation formula of the material stacking height is h ═ Ψ D, and Ψ is a filling factor.
Figure BDA0002737502000000083
Theta is the internal friction angle of the concrete.
S302, according to a calculation formula N ═ N1+2N2And calculating the pressure of the concrete in unit length on the inner wall of the spiral conveying channel.
Further, the power P consumed for friction generated between the concrete and the helical blade2When the calculation is carried out, the method comprises the following steps:
calculating the power consumed by friction generated between the concrete and the helical blade according to the interaction force relationship between the concrete and the helical blade, wherein the calculation formula is as follows:
Figure BDA0002737502000000084
in the formula, F2Referring to fig. 4, β is a lead angle, which is a frictional force between the concrete per unit length and the helical blade.
Therefore, the calculation formula for obtaining the internal energy of the concrete is
Figure BDA0002737502000000085
S400, according to the energy conversion relational expression W of the spiral conveying concreteO+EP+EuCalculating concrete kinetic energy Ep。
Specifically, in the process of conveying materials by the aid of spiral conveying concrete, the spiral driving motor drives the spiral blades to rotate, and the concrete in the hopper is forcibly pushed out by the aid of the rotating spiral blades. Therefore, the mechanical energy output by the screw driving motor is mainly consumed on the screw and the concrete, wherein the energy consumed on the screw is mainly expressed in the form of screw rotation of the screw, is irrelevant to materials in the conveying process and is screw no-load energy consumption, namely screw mechanical energy; the energy consumed on the concrete is mainly expressed in two aspects, on one hand, the axial motion and the radial motion of concrete particles in the material conveying process are expressed in the form of the kinetic energy of the concrete particles, namely the kinetic energy of the concrete; on the other hand, the friction with the spiral and the inner wall of the channel caused by the composite motion of the concrete particles is expressed in the form of the internal energy of the concrete particles, namely the internal energy of the concrete.
In summary, the energy conservation law shows that the energy conversion relationship in the process of screw conveying materials is as follows: the mechanical energy of the screw driving motor is converted into screw mechanical energy, concrete kinetic energy and concrete internal energy, as shown in fig. 5.
Modeling the relevant energy numerical value in the figure 4 to obtain an energy conversion relation formula of the spiral conveying concrete, wherein the energy conversion relation formula is as follows:
W＝WO+EP+Eu
wherein, W is the mechanical energy output by the screw driving motor; w0Is spiral mechanical energy; epThe kinetic energy of the concrete is obtained; euIs the concrete internal energy.
Therefore, the mechanical energy W output from the known screw drive motor and the screw mechanical energy W are known0And internal energy E of concreteuUnder the condition of (3), the kinetic energy E of the concrete can be calculatedp。
S500, according to axial movement kinetic energy and rotation kinetic energy generated by the screw extrusion of the concrete and concrete kinetic energy EpCalculating the screw conveying capacity Q of the material distributorn。
Wherein, the concrete kinetic energy is calculated by adopting the axial movement kinetic energy and the rotation kinetic energy generated by the spiral extrusion of the concrete, and the calculation formula is
Figure BDA0002737502000000091
Wherein J, ω, and m are the moment of inertia, angular velocity, and delivered weight of the concrete in that order.
Furthermore, the space formed by the diameter of the spiral blade and the diameter of the spiral shaft is regarded as a hollow cylindrical space, when the concrete is conveyed in a spiral mode, the concrete is filled in the hollow cylindrical space formed by the spiral, therefore, the rotational inertia J of the concrete needs to be calculated by adopting the rotational inertia of the hollow cylinder, and the calculation formula is as follows
Figure BDA0002737502000000101
In the formula, D is the diameter of the helical blade; d is the diameter of the spiral shaft.
And because the relation between the angular velocity and the revolution number in the reference rotating motion can be calculated by adopting the rotating number n of the screw, the calculation formula is
Figure BDA0002737502000000102
In the formula, n is the number of revolutions of the spiral. Then, referring to the relationship among the screw pitch, the number of revolutions and the axial speed, the angular speed V of the axial speed of the screw is determinedzPerforming calculation with the formula
Figure BDA0002737502000000103
In the formula, n, S, VzThe number of revolutions of the screw, the pitch and the axial speed are in turn.
Finally, the concrete is rotated
Figure BDA0002737502000000104
Angular velocity of concrete
Figure BDA0002737502000000105
Angular velocity of screw
Figure BDA0002737502000000106
Formula for calculating kinetic energy of concrete
Figure BDA0002737502000000107
Calculation formula for obtaining final concrete kinetic energy
Figure BDA0002737502000000108
Therefore, the energy conversion relational expression W of the auger concrete is WO+EP+EuFormula W of mechanical energy W is UIt-I2Rt, calculation formula of concrete kinetic energy
Figure BDA0002737502000000109
And coagulationCalculation formula of internal energy of soil
Figure BDA00027375020000001010
The weight relation Q of the materials conveyed in unit time t is equal to m/t, and the spiral conveying capacity Q of the distributing machine can be obtainednThe calculation formula of (c):
Figure BDA00027375020000001011
in the formula: u, I, R and t are the voltage, coil current, coil resistance and running time of the spiral driving motor; u shape0、I0Respectively the voltage and the current when the spiral driving motor is in no-load; d is the diameter of the helical blade; d is the diameter of the spiral shaft; n is the number of revolutions of the helix; s is the screw pitch of the screw; mu is the friction coefficient between the concrete and the inner wall of the spiral conveying channel; l is the conveying length of the concrete in the conveying channel; rho is the bulk density of the material; g is gravity acceleration; psi is the filling rate of the spiral conveying channel; beta is the helix angle.
The invention provides a calculation method of spiral conveying capacity for precast concrete distribution, which is based on an energy conversion relational expression W (W-W) of spiral conveying concreteO+EP+EuCalculating the mechanical energy W output by the screw driving motor according to the energy consumption output by the DC motor when the DC motor drives the load, and calculating the screw mechanical energy W of the screw driving motor according to the energy consumption output by the DC motor when the DC motor is in no-load0And calculating the internal energy E of the concrete according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectivelyuCalculating the internal energy E of concreteuThen according to the axial movement kinetic energy and rotation kinetic energy produced by the screw extrusion action of concrete and concrete kinetic energy EpCalculating the high-precision spiral conveying quantity Q of the distributing machinenThe method provided by the invention considers the mechanical energy consumption output by the spiral driving motor when the concrete is conveyed in a spiral manner, and then carries out spiral conveying quantity Q of the distributing machine through the energy conversion relational expression and the mass relation of the concrete conveyed by the distributing machinenPerform a calculation, and thenThe calculation accuracy of the spiral conveying amount is improved, and the calculated value can be used as a target forecast value of the automatic cloth weight control system and is beneficial to the stable operation of the automatic weight control system.
Based on the method shown in fig. 2 to 5, correspondingly, the embodiment of the invention also provides a storage device, wherein a computer program is stored on the storage device, and when the computer program is executed by a processor, the method for calculating the spiral conveying amount of the precast member concrete cloth shown in fig. 2 to 5 is realized.
In order to achieve the above object, an embodiment of the present invention further provides a calculation apparatus for a spiral conveying amount of a precast concrete cloth, where the entity apparatus includes a storage device and a processor; a storage device for storing a computer program; a processor for executing a computer program to implement the above-described calculation method for the screw delivery amount of the precast member concrete cloth as shown in fig. 2 to 5.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (5)

1. A calculation method of spiral conveying amount of concrete cloth of a prefabricated part is characterized by comprising the following steps:
calculating mechanical energy W output by the spiral driving motor according to the output energy consumption when the direct current motor drives the load;
calculating the spiral mechanical energy W of the spiral driving motor according to the output energy consumption of the DC motor in no-load0；
Calculating the internal energy E of the concrete according to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectivelyu；
According toEnergy conversion relational expression W ═ W of spiral conveying concreteO+EP+EuCalculating concrete kinetic energy Ep；
According to the axial movement kinetic energy and the rotation kinetic energy generated by the screw extrusion of the concrete and the concrete kinetic energy EpCalculating the screw conveying capacity Q of the material distributorn；
According to the friction force generated by the concrete moving towards the outlet of the conveying channel and the friction force generated by the spiral blade and the inner wall of the conveying channel respectively, the internal energy E of the concreteuThe calculation formula used in the calculation comprises:
Eu＝Pft＝(P1+P2)t
in the formula, PfConsuming power for concrete friction; p1And P2The power consumed by friction between the concrete and the inner wall of the spiral conveying channel and the spiral is respectively;
power P consumed in friction between concrete and inner wall of spiral conveying channel1When the calculation is carried out, the method comprises the following steps:
according to the calculation formula P1＝F1lVz＝NμlVzCalculating the friction power consumption P between the concrete and the inner wall of the spiral conveying channel1；
In the formula, F1Is the friction between the concrete in unit length and the inner wall of the spiral conveying channel; n is the pressure of concrete in unit length on the inner wall of the spiral conveying channel; mu is the friction coefficient between the concrete and the inner wall of the spiral conveying channel; l is the conveying length of the concrete in the inner wall of the spiral conveying channel, VzThe angular velocity of the screw axial velocity;
when calculating the power consumed by friction between the concrete and the inner wall of the spiral conveying channel, the method comprises the following steps: neglecting gaps among concrete particles, and assuming that concrete in the spiral conveying channel is approximately in a liquid state, so as to ensure that the concrete is fully contacted with the inner wall of the conveying channel within the filling range of the conveying channel;
further comprising: according to the radial sectional area A and the material stacking height h of the concrete in the spiral conveying channel, a formula N is calculated1Concrete of unit length calculated as rho gAThe pressure of the soil on the bottom surface of the spiral conveying channel and the pressure of the soil on the bottom surface of the spiral conveying channel are calculated according to a formula
Figure FDA0003514106290000021
Calculating the side pressure of concrete in unit length to the spiral conveying channel, wherein rho is the bulk density of the material; g is the acceleration of gravity; a and h are respectively the radial section area and the material stacking height of the concrete in the spiral conveying channel; kSide wallIs a lateral pressure coefficient;
according to the calculation formula N ═ N1+2N2Calculating the pressure of concrete in unit length on the inner wall of the spiral conveying channel;
power P consumed by friction generated between concrete and helical blade2When the calculation is carried out, the method comprises the following steps:
calculating the power consumed by friction generated between the concrete and the helical blade according to the interaction force relationship between the concrete and the helical blade, wherein the calculation formula is as follows:
Figure FDA0003514106290000022
in the formula, F2Is the friction between the concrete and the helical blade, and beta is the helix angle.
2. The method for calculating the spiral conveying amount of the precast concrete cloth according to claim 1, wherein a calculation formula for calculating the mechanical energy W output by the spiral driving motor based on the energy consumption output by the direct current motor when the load is driven comprises:
W＝UIt-I2Rt
wherein U, I, R and t are the voltage, coil current, coil resistance and run time of the screw drive motor, in that order.
3. The method for calculating the screw feeding amount of precast member concrete cloth according to claim 1, wherein the screw feeding amount is calculated according to a dc motor idleOutput energy consumption during loading, spiral mechanical energy W to the spiral driving motor0The calculation formula used in the calculation comprises:
Figure FDA0003514106290000031
in the formula of U0、I0The voltage and the current of the spiral driving motor in no-load are respectively, R is coil resistance, and t is running time.
4. A storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the calculation method for the auger delivery amount of a precast member concrete cloth according to any one of claims 1 to 3.
5. A device for calculating the spiral conveying amount of precast concrete cloth, comprising a storage medium, a processor and a computer program stored on the storage medium and operable on the processor, wherein the processor implements the method for calculating the spiral conveying amount of precast concrete cloth according to any one of claims 1 to 3 when executing the program.
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