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Cylindrical sample preparation device for measuring moisture content of green sand through capacitance method and method for measuring moisture content of green sand

A technology of wet clay sand and water content, which is applied in the preparation of test samples, material capacitance, etc., can solve the problems of low precision of water content in wet clay sand.

Inactive Publication Date: 2014-09-17
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low accuracy of measuring the water content of wet clay sand by capacitance method in the past, and to provide a method for measuring the water content of wet clay sand using a cylindrical sample preparation device for measuring the water content of wet clay sand by capacitance method

Method used

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  • Cylindrical sample preparation device for measuring moisture content of green sand through capacitance method and method for measuring moisture content of green sand
  • Cylindrical sample preparation device for measuring moisture content of green sand through capacitance method and method for measuring moisture content of green sand
  • Cylindrical sample preparation device for measuring moisture content of green sand through capacitance method and method for measuring moisture content of green sand

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 Describe this embodiment mode, a kind of cylindrical sample preparation device for measuring the moisture content of wet clay sand by capacitance method described in this embodiment mode, it comprises, main sample cylinder 1, secondary sample cylinder 2, auxiliary sample cylinder 3, two semicircular rings Excitation electrode 4, circular isolation electrode 5, isolation electrode grounding wire 6 and two excitation electrode shielding wires 4-1;

[0024] The secondary sample cylinder 2 is located directly above the main sample cylinder 1, the auxiliary sample cylinder 3 is set on the outside of the main sample cylinder 1 and the secondary sample cylinder 2, and the main sample cylinder 1, the secondary sample cylinder 2 and the auxiliary sample cylinder 3 are coaxial;

[0025] The inner wall of the main sample cylinder 1 is inlaid with two semi-circular excitation electrodes 4 of the same type, and the...

specific Embodiment approach 2

[0029] Specific implementation mode two: the following combination figure 1 This embodiment will be described. This embodiment is a further description of Embodiment 1. The inner diameter of the secondary sample cylinder 2 described in this embodiment is 50 mm.

specific Embodiment approach 3

[0030] Specific implementation mode three: the following combination figure 1 This embodiment will be described. This embodiment is a further description of Embodiment 1. The gap between the secondary sample cylinder 2 and the auxiliary sample cylinder 3 in this embodiment is 0.5 mm.

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Abstract

The invention discloses an application method for measuring the moisture content of the green sand through a capacitance method, belongs to the field of moisture measurement of cast green sand, and solves the problem that the measuring accuracy of the moisture content of the green sand through capacitance methods is low in the past. The method includes producing a sand sample with the height equal to a main sample drum through the sample preparation device; connecting two exciting electrode shielded wires with a parallel resistance model circuit respectively, exerting alternating current excitation voltage on two exciting electrodes through the two exciting electrode shielded wires, turning off a switch K, serially connecting a sand sample equivalent resistor Rx with a capacitor Cx, and turning on the switch K, parallelly connecting the sand sample equivalent resistor, the capacitor Cx and a first resistor R0; and measuring the voltage drop uo1 and uo2 of a second resistor R under the two states to obtain the Cx, and obtaining the moisture content of the green sand through the existing relation between capacitor Cx and the moisture content.

Description

technical field [0001] The invention relates to the field of moisture measurement of casting green clay sand, in particular to a device and method for measuring the moisture content of green clay sand by capacitance method. Background technique [0002] Moisture content is an important component parameter of green clay sand, and it is also one of the most sensitive parameters to performance. The water content directly determines the quality of the green clay sand, which in turn affects the quality of the casting. Therefore, many methods for measuring the water content of wet clay sand have been developed, such as resistance method, capacitance method, inductance method, neutron absorption method, microwave method, etc. Among them, the capacitance method has become the most commonly used on-line electrical measurement method for the moisture content of wet clay sand due to the simple structure of the sensor and detection circuit. The existing relationship between the water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N27/22
Inventor 石德全高桂丽李大勇
Owner HARBIN UNIV OF SCI & TECH
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