CN-121995984-A - Method for predicting mechanical heat and method for controlling outlet temperature of concrete mixing plant

CN121995984ACN 121995984 ACN121995984 ACN 121995984ACN-121995984-A

Abstract

The application discloses a method for predicting mechanical heat and a method for controlling outlet temperature of a concrete mixing plant, and relates to the technical field of concrete production equipment. The method comprises the steps of obtaining a first target stirring time length in a concrete stirring process, determining a motor heat loss predicted value in the first target stirring time length, a stirring heat predicted value generated by sliding friction and collision between a blade of a stirrer and the concrete and a shearing heat predicted value generated by friction between aggregate in the concrete and slurry according to the first target stirring time length based on a predetermined motor heat loss predicted value, a stirring heat predicted value and a shearing heat predicted value, and determining a mechanical heat predicted value in the first target stirring time length according to the motor heat loss predicted value, the stirring heat predicted value and the shearing heat predicted value based on a predetermined mechanical heat predicted model. The application can improve the accuracy of the mechanical thermal prediction result.

Inventors

DING KUN
LONG BO
DI XUANJIA
ZHAO SHUXING
Zha Yumeng

Assignees

湖南中联重科混凝土机械站类设备有限公司

Dates

Publication Date: 20260508
Application Date: 20251216

Claims (10)

1. A method for predicting mechanical heat during concrete mixing, the method comprising: acquiring a first target stirring time length in a concrete stirring process; based on a pre-determined motor heat loss prediction model, a stirring heat prediction model and a shearing heat prediction model, determining a motor heat loss prediction value in the first target stirring time period, a stirring heat prediction value generated by sliding friction and collision between a stirring blade and concrete and a shearing heat prediction value generated by friction between aggregate in the concrete and slurry according to the first target stirring time period, wherein the motor heat loss prediction model, the stirring heat prediction model and the shearing heat prediction model are all models taking the stirring time period as variables; And determining a mechanical heat prediction value in the first target stirring duration according to the motor heat loss prediction value, the stirring heat prediction value and the shearing heat prediction value based on a predetermined mechanical heat prediction model, wherein the mechanical heat prediction model characterizes a nonlinear relation between mechanical heat and motor heat loss, stirring heat and shearing heat.
2. The method of claim 1, wherein the determining of the mechanothermal prediction model comprises: acquiring concrete temperature rise of the concrete in the mixer under different actual mixing time periods detected by the temperature detection device; Determining actual mechanical heat under different actual stirring time periods according to the concrete temperature rise, a preset concrete material mixing ratio and a preset concrete specific heat capacity; based on a nonlinear regression analysis method, the mechanical heat prediction model is obtained according to the actual mechanical heat under different actual stirring time periods, a plurality of actual stirring time periods, the motor heat loss prediction model, the stirring heat prediction model and the shearing heat prediction model.
3. The method of claim 1, wherein the motor heat loss prediction model satisfies the following equation: Q Motor with a motor housing =P×(1-η) ×t Wherein Q Motor with a motor housing is a predicted value of heat loss of the motor, P is a rated power of a preset motor, eta is a preset motor efficiency, and t is a stirring time; the stirring heat prediction model satisfies the following formula: Q Stirring =k×ρ×N 3 ×D 5 ×t Wherein Q Stirring is a predicted value of stirring heat, k is a preset resistance coefficient, ρ is a preset concrete density, N is a preset stirring shaft rotating speed of the stirrer, D is a preset stirring blade radius, and t is stirring time; the shear heat prediction model satisfies the following formula: Q Shearing =μ×γ 2 ×V×t Wherein Q Shearing is a shear heat predicted value, mu is preset concrete effective viscosity, gamma is preset average shear rate, V is preset concrete volume, and t is stirring time.
4. A control method for outlet temperature of a concrete mixing plant, the control method comprising: Acquiring initial control inlet temperature of a target concrete material, initial control concrete ice adding amount of an ice adding system of a concrete mixing building, second target mixing duration of a mixer of the concrete mixing building and target outlet temperature of the concrete; Determining a mechanical heat prediction value in the second target stirring time period according to the second target stirring time period, wherein the mechanical heat prediction value is predicted according to the method for predicting mechanical heat in the concrete stirring process of any one of claims 1 to 3; Determining an initial outlet temperature predicted value based on a predetermined outlet temperature predicted model according to the initial control inlet temperature, the initial control concrete ice adding amount and the mechanical heat predicted value in the second target stirring time period, wherein the outlet temperature predicted model characterizes the relation between the outlet temperature and the control inlet temperature of concrete materials, the control concrete ice adding amount of an ice adding system and the mechanical heat in the concrete stirring process; Under the condition that the temperature deviation between the initial outlet temperature predicted value and the target outlet temperature exceeds a preset temperature deviation range, adjusting the initial control inlet temperature and the initial control concrete ice adding amount until the temperature deviation is positioned in the preset temperature deviation range so as to obtain the target control inlet temperature of the target concrete material and the target control concrete ice adding amount of the ice adding system; and controlling the operation of the concrete mixing plant according to the target control machine entering temperature and the target control concrete ice adding amount.
5. The control method according to claim 4, characterized by further comprising: And under the condition that the temperature deviation between the initial outlet temperature predicted value and the target outlet temperature is within a preset temperature deviation range, controlling the operation of the concrete mixing plant according to the initial control inlet temperature and the initial control concrete ice adding amount.
6. An apparatus for predicting mechanical heat during concrete mixing, the apparatus comprising: A memory configured to store instructions, and A processor configured to invoke the instructions from the memory and when executing the instructions is capable of implementing the method for predicting mechanical heat during concrete mixing according to any one of claims 1 to 3.
7. A control device for the outlet temperature of a concrete mixer, the control device comprising: A memory configured to store instructions, and A processor configured to recall the instructions from the memory and when executed enable the control method for concrete mixing plant exit temperature according to claim 4 or 5.
8. A concrete mixing plant, comprising: the apparatus for predicting mechanical heat in a concrete mixing process of claim 6; Or a control device for the outlet temperature of a concrete mixing plant according to claim 7.
9. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method for predicting mechanical heat in a concrete mixing process according to any one of claims 1 to 3.
10. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the control method for a concrete mixing plant exit temperature according to claim 4 or 5.

Description

Method for predicting mechanical heat and method for controlling outlet temperature of concrete mixing plant Technical Field The application relates to the technical field of concrete production equipment, in particular to a method for predicting mechanical heat and a method for controlling outlet temperature of a concrete mixing plant. Background In the prior art, mechanical heat prediction during concrete mixing is usually calculated by using an empirical formula, wherein the empirical formula is generally Q j =42 Pt/V, where P is the mixer power (kW), t is the mixing time (min), and V is the discharge volume (m 3) of the mixer, and in the empirical formula, the mechanical heat is only related to the mixer power, the mixing time, and the discharge volume. However, in actual concrete mixing, in addition to the above factors, other factors may also have an effect on mechanical heat generation, such as mixer blade parameters and the like. Therefore, the mechanical heat predicted by the empirical formula in the prior art is not accurate, i.e., the prior art has a problem that the prediction result of the mechanical heat is not accurate. Disclosure of Invention The embodiment of the application aims to provide a method for predicting mechanical heat in a concrete mixing process, a control method for the outlet temperature of a concrete mixing plant, a device for predicting mechanical heat in the concrete mixing process, a control device for the outlet temperature of the concrete mixing plant, the concrete mixing plant and a machine-readable storage medium, which are used for solving the problem that the prediction result of mechanical heat in the prior art is inaccurate. To achieve the above object, a first aspect of the present application provides a method for predicting mechanical heat during concrete mixing, the method comprising: acquiring a first target stirring time length in a concrete stirring process; Based on a pre-determined motor heat loss prediction model, a stirring heat prediction model and a shearing heat prediction model, determining a motor heat loss prediction value in a first target stirring time period, a stirring heat prediction value generated by sliding friction and collision between a stirring machine blade and concrete and a shearing heat prediction value generated by friction between aggregate in the concrete and slurry according to the first target stirring time period, wherein the motor heat loss prediction model, the stirring heat prediction model and the shearing heat prediction model are all models taking the stirring time period as variables; And determining a mechanical heat prediction value within a first target stirring time period according to the motor heat loss prediction value, the stirring heat prediction value and the shearing heat prediction value based on a predetermined mechanical heat prediction model, wherein the mechanical heat prediction model characterizes a nonlinear relation between mechanical heat and motor heat loss, stirring heat and shearing heat. The method comprises the steps of obtaining concrete temperature rise of concrete in a mixer under different actual mixing time periods detected by a temperature detection device, determining actual mechanical heat under different actual mixing time periods according to the concrete temperature rise, a preset concrete material mixing ratio and a preset concrete specific heat capacity, and obtaining a mechanical heat prediction model according to the actual mechanical heat, a plurality of actual mixing time periods, a motor heat loss prediction model, a mixing heat prediction model and a shearing heat prediction model under different actual mixing time periods based on a nonlinear regression analysis method. In the embodiment of the application, the motor heat loss prediction model meets the following formula: Q Motor with a motor housing =P×(1-η) ×t Wherein Q Motor with a motor housing is a predicted value of heat loss of the motor, P is a rated power of a preset motor, eta is a preset motor efficiency, and t is a stirring time; the stirring heat prediction model satisfies the following formula: Q Stirring =k×ρ×N3×D5×t Wherein Q Stirring is a predicted value of stirring heat, k is a preset resistance coefficient, ρ is a preset concrete density, N is a preset stirring shaft rotating speed of the stirrer, D is a preset stirring blade radius, and t is stirring time; the shear thermal prediction model satisfies the following formula: Q Shearing =μ×γ2×V×t Wherein Q Shearing is a shear heat predicted value, mu is preset concrete effective viscosity, gamma is preset average shear rate, V is preset concrete volume, and t is stirring time. The second aspect of the application provides a control method for outlet temperature of a concrete mixing plant, comprising the following steps: Acquiring initial control inlet temperature of a target concrete material, initial control concrete ice adding amount of an ice addin