CN102156269A - Automation magnetic susceptibility instrument capable of measuring long core, measurement method and placing support thereof - Google Patents

Abstract

The invention relates to an automatic magnetic susceptibility meter capable of measuring long core samples, comprising a portal probe (20), a magnetic susceptibility meter (24) and a chain transmission device, on which one or more standard samples can be placed , or place long core samples, various samples can pass through the portal probe (20) in turn, and the portal probe (20) sends the measured magnetic susceptibility signals of one or more samples to the magnetic susceptibility The instrument (24) obtains data collection after processing. The present invention can measure standard samples or long rock core samples in large quantities due to the adoption of a chain conveying device. The influence of experimental errors caused by human factors is reduced; at the same time, due to the introduction of the chain transmission device, the experimenters are freed from the original boring and complicated measurements, which greatly reduces the work intensity of the experimenters and improves work efficiency.

Description

Automated magnetic susceptibility instrument capable of measuring long rock cores, measuring method and mounting bracket thereof

technical field

The invention relates to an automatic magnetic susceptibility meter capable of measuring long core rock samples or a single rock sample, which can be widely used in the fields of paleomagnetism, rock magnetism, and environmental magnetism in a large number of laboratory sample measurements.

Background technique

Magnetic susceptibility indicates how easily a substance is magnetized under the action of an external magnetic field, and it is a dimensionless value. The determination and analysis of the magnetic susceptibility of substances are often used in research fields such as Quaternary geology, archaeology, and soil. At present, magnetic susceptibility is a very valuable analysis parameter in environmental research topics such as urban environmental pollution investigation, heavy metal pollution investigation of waterways and lakes, and paleoenvironmental changes. Through the analysis of magnetic susceptibility, it can indirectly reflect the pollution status and environmental changes.

In recent years, the commonly used magnetic susceptibility meter in China is the MS-2 magnetic susceptibility meter of Barrington Company in the United Kingdom. It consists of a magnetic susceptibility reading table and a series of multi-purpose probes for measuring soil and rock magnetic susceptibility. It can be applied in the field or in the laboratory. Literature, sedimentology, core profiling or correlation studies and magnetic compositional analysis. In archaeological research, the system is mainly used to detect the phenomenon of enhanced magnetic susceptibility due to human activities, mainly the use of fire. The measurement is non-destructive and uses a low-frequency magnetic field to ensure that the measurement is not affected by the conductivity of the sample. The probe has a temperature compensation function to reduce the drift generated during measurement. A change in frequency occurs when the sample material is placed under the influence of a 100 μT low-frequency alternating magnetic field generated by the probe. This change is converted to a magnetic susceptibility value, expressed digitally in SI or CGS units, depending on the choice. Diamagnetic values (negative numbers) can also be measured. The instrument uses a built-in battery that can be charged from the mains or a car power socket, and has a battery status display and charging indication. The key or its toggle switch can be used for zeroing or measuring. A range switch adds one decimal place of resolution, but the measurement time also increases. There is a serial port available for computer control and data transfer. The switch located on the rear panel of the instrument is used to select the appropriate communication protocol. All switches or receptacles are housed in environmentally acceptable packaging.

As shown in Figure 1, the MS-2 type magnetic susceptibility meter of Barrington Company in the United Kingdom mainly includes the MS2 type magnetic susceptibility meter 10 and its accompanying MS2B dual-frequency probe 11. The MS2B dual-frequency probe is a box with samples on it. The material is placed in the hole 12. During the measurement, the long core samples need to be placed in the sample material placed hole 12 to be measured respectively in turn. After a long period of use, the MS-2 magnetic susceptibility instrument has completed a large number of accurate measurements of the mass or volume magnetic susceptibility of standard paleomagnetic samples in the study of rock and mineral magnetism. However, in the process of use, it is found that the instrument still has many limitations, specifically:

(1) Existing instruments can only perform a single measurement of the sample, that is, the sample needs to be put into the probe for measurement and then taken out every time. In this way, due to the different proficiency and seriousness of the user, the artificiality of the test sample data will be caused. error.

(2) A lot of repetitive labor also increases the workload of the experimenter and reduces work efficiency.

(3) Since the MS2B dual-frequency probe is a box, the existing instrument can only measure small cylinders and cubic samples, but cannot complete the measurement of long strips of long core samples with a length of about one meter.

Contents of the invention

The present invention has designed a kind of automatic magnetic susceptibility instrument that can measure long rock core, measuring method and its mounting support, and the technical problem that it solves is:

(1) Existing instruments can only perform a single measurement of the sample, that is, the sample needs to be put into the probe for measurement and then taken out every time. In this way, due to the different proficiency and seriousness of the user, the artificiality of the test sample data will be caused. error.

(2) A lot of repetitive labor also increases the workload of the experimenter and reduces work efficiency.

(3) Because the MS2B dual-frequency probe is a box body, the existing instrument can only complete the measurement of small cylinders and cube samples, but cannot complete the measurement of long core samples.

In order to solve the above-mentioned technical problems, the present invention adopts the following scheme:

An automatic magnetic susceptibility meter capable of measuring long rock cores, comprising a portal probe (20), a magnetic susceptibility meter (24) and a chain conveyor, one or more long rock core samples placed on the chain conveyor pass through the Through the portal probe (20), the portal probe (20) sends the measured magnetic susceptibility data of one or more long rock core samples to the magnetic susceptibility meter (24) for collection.

Further, the chain transmission device includes a transmission chain (21), a sprocket (22), a transmission belt and a stepping motor (23), the transmission belt is fixed on the transmission chain (21), and the stepping motor ( 23) The conveyor chain (21) and the conveyor belt are moved by driving the sprocket (22) to rotate, and the conveyor chain (21) and the conveyor belt pass through the portal probe (20).

Further, the conveying chain (21) is a non-magnetic chain.

Further, it also includes a control terminal, a port of the control terminal is used to control the magnetic susceptibility meter (24) to measure the measurement interval and the number of measurements of each long core sample or standard sample and to receive the magnetic susceptibility meter ( 24) Magnetic susceptibility data of long core samples or standard samples; the other port of the control terminal is used to control the start and stop of the chain conveyor and the direction and speed of the conveyor chain (21).

Further, the control terminal is a computer (25).

A method for measuring an automatic magnetic susceptibility instrument capable of measuring long cores, comprising the following steps:

Step 1: The user sets the corresponding parameters for measuring long core samples on the computer (25), including the number of standard samples to be measured, the number of measurements of each standard sample, and the measurement interval of standard samples; or long core samples The measurement interval and the number of measurements of each measurement point;

Step 2: After the setting is completed, the computer transmits instructions to control the stepping motor (23), and the stepping motor (23) moves the long core sample to the door through a non-magnetic transmission chain (21) and a conveyor belt working area of type probe (20);

Step 3: The computer (25) calculates the instruction code that needs to be input to the magnetic susceptibility meter (24) according to the parameters input in step 1, and the portal probe (20) measures each long rock The core sample is measured before the background susceptibility: X background susceptibility , and then each long core sample susceptibility is measured: X long core sample susceptibility ,

The computer (25) calculates the true value of the magnetic susceptibility of each long rock core sample: X= X long rock core sample magnetic susceptibility − X background magnetic susceptibility .

Further, after each measurement of the magnetic susceptibility of a long core sample, the portal probe (20) measures the background value again to check whether the instrument drifts. Automatic alarms prevent inaccurate data from being recorded.

A mounting bracket is used for placing an automatic magnetic susceptibility instrument with measurable length rock cores. The material of the mounting bracket body is all non-magnetic wood.

Further, it includes a first step (30) and a second step (31), the vertical height of the first step (30) is higher than the second step (31), and placing on the first step (30) The portal probe (20); the second step (31) places a long core sample to be measured.

The measurable length core automatic magnetic susceptibility meter, the measuring method and its mounting bracket have the following beneficial effects:

(1) The present invention uses a chain conveyor to measure large quantities of long rock core samples. The influence of experimental errors caused by human factors is reduced; at the same time, due to the introduction of the chain transmission device, the experimenters are freed from the original boring and complicated measurements, which greatly reduces the work intensity of the experimenters and improves work efficiency.

(2) The present invention replaces the existing probe on the basis of using a chain conveyor to transmit a large number of long core samples, and the portal probe can not only measure long core samples, but also has a wide range of measurable sample types. increase to a great extent.

(3) Since the present invention connects the magnetic susceptibility meter with the computer, it increases the data processing, display and storage functions of multi-sample measurement, and can also control the chain transmission device and the magnetic susceptibility meter to work together, which enriches the operability of the instrument and measurement accuracy.

Description of drawings

Figure 1: A three-dimensional schematic diagram of the existing MS2 magnetic susceptibility meter;

Fig. 2: The structure schematic diagram of the automatic magnetic susceptibility instrument of measurable rock core of the present invention;

Fig. 3: The working principle diagram of the automatic magnetic susceptibility instrument of the measurable rock core of the present invention;

Fig. 4: A three-dimensional schematic diagram of the mounting bracket of the automatic magnetic susceptibility instrument of the measurable rock core of the present invention.

Explanation of reference signs:

10—MS2 magnetic susceptibility meter; 11—MS2B dual-frequency probe; 12—sample material placement hole;

20—portal probe; 21—transmission chain; 22—sprocket; 23—stepper motor; 24—magnetic susceptibility meter; 25—computer;

30—the first step; 31—the second step.

Detailed ways

Below in conjunction with Fig. 2 to Fig. 4, the present invention will be further described:

As shown in Figure 2, a kind of automatic magnetic susceptibility instrument that can measure long rock core sample, comprises gate type probe 20, magnetic susceptibility instrument 24 and chain transmission device, places one or more standard samples on the chain transmission device, or places long Rock core samples and various samples can pass through the portal probe 20 in turn, and the portal probe 20 sends the measured magnetic susceptibility signals of one or more samples to the magnetic susceptibility meter 24 for data collection after processing.

Described chain transmission device comprises transmission chain 21, sprocket wheel 22, conveyer belt and stepper motor 23, conveyer belt is fixed on the conveyer chain 21, makes conveyer chain 21 and conveyer belt move by driving sprocket 22 at stepper motor 23, conveys The chain 21 and the conveyor belt pass through the portal probe 20 . In order to reduce the magnetic interference to the measured value, the transmission chain 21 is a non-magnetic chain. Among them, the movement of the stepping motor 23 drives the sprocket 22, and the transmission chain 21 rotates to complete the automatic transmission of samples on the conveyor belt. At the same time, the software controls the magnetic susceptibility meter to measure the long core samples that have been transmitted to the probe, thereby completing the automation of large quantities of samples. Measurement. For long core samples, a stepping motor is used to control the spacing of the measuring points to realize the measurement of long core samples with any measuring point spacing.

Also includes a control terminal, a port of the control terminal is used to control the magnetic susceptibility meter 24 to measure the measurement interval and the number of measurements of each long rock core sample or standard sample and receive the long rock core from the magnetic susceptibility meter 24 Sample or standard sample magnetic susceptibility data; another port of the control terminal is used to control the start and stop of the chain conveyor and the running direction and speed of the conveyor chain 21 . The length-measurable core automatic magnetic susceptibility instrument will use LabVIEW software programming to realize the control of the system. In the programming interface, the user can set the number of test samples, the number of tests for each sample, and the distance between samples. When the program is running, the G language of the program is converted into the ASCII code that the magnetic susceptibility meter and the stepper motor can recognize through the serial port, so as to realize the control of the two.

As shown in Figure 3, the working principle of the automatic magnetic susceptibility instrument of the measurable rock core of the present invention is as follows:

Step 1: the user sets the corresponding parameters of measuring long rock core samples on the computer 25, including measuring the quantity of standard samples, the number of times of measurement of each standard sample and the measurement interval of standard samples; or the measurement interval and The number of measurements for each measurement point;

Step 2: After completing the setting, the computer transmits instructions to control the stepping motor 23, and the stepping motor 23 moves the long rock core sample to the working area of the portal probe 20 through the non-magnetic transmission chain 21 and the conveyor belt;

Step 3: The computer 25 calculates the instruction code that needs to be input to the magnetic susceptibility meter 24 by the program according to the parameters input in the step 1, and the portal probe 20 measures the background value magnetic susceptibility before measuring each long rock core sample: X background Magnetic susceptibility , then measure the magnetic susceptibility of each long rock core sample: X long rock core sample magnetic susceptibility , computer 25 calculates the true value of each long rock core sample magnetic susceptibility: X= X long rock core sample magnetic susceptibility - X background magnetic susceptibility . The reason for this calculation is that the magnetic susceptibility of the long core sample: X long core sample magnetic susceptibility includes the background value magnetic susceptibility: X background magnetic susceptibility , which needs to be removed to obtain the long rock core The true value of the magnetic susceptibility of the sample.

After each measurement of the magnetic susceptibility of a long core sample, the portal probe 20 measures the background value again to check whether the instrument drifts. If any drift occurs, the long core automatic magnetic susceptibility instrument will automatically alarm to prevent inaccuracy. data is recorded.

As shown in Figure 4, a mounting bracket is used to place an automatic magnetic susceptibility meter with measurable length cores. The material of the mounting bracket body is all non-magnetic wood.

Specifically, it includes a first step 30 and a second step 31, the vertical height of the first step 30 is higher than the second step 31, and the portal probe 20 is placed on the first step 30; the second step 31 places the long rock to be measured core sample. Its size is 340mm×10mm×30mm. Because the instrument measures magnetic parameters, it is necessary to avoid ferromagnetic substances near it, so the whole bracket is all made of non-magnetic wood.

The measurable length core automatic magnetic susceptibility meter, the measuring method and its mounting bracket have the following beneficial effects:

(1) The present invention uses a chain conveyor to measure large quantities of long rock core samples. The influence of experimental errors caused by human factors is reduced; at the same time, due to the introduction of the chain transmission device, the experimenters are freed from the original boring and complicated measurements, which greatly reduces the work intensity of the experimenters and improves work efficiency.

(2) The present invention replaces the existing probe on the basis of using a chain conveyor to transmit a large number of long core samples, and the portal probe can not only measure long core samples, but also has a wide range of measurable sample types. increase to a great extent.

(3) Since the present invention connects the magnetic susceptibility meter with the computer, it increases the data processing, display and storage functions of multi-sample measurement, and can also control the chain transmission device and the magnetic susceptibility meter to work together, which enriches the operability of the instrument and measurement accuracy.

Above, the present invention has been exemplarily described in conjunction with the accompanying drawings. Obviously, the realization of the present invention is not limited by the above-mentioned manner, as long as various improvements of the method concept and technical solutions of the present invention are adopted, or the present invention is implemented without improvement. The ideas and technical schemes directly applied to other occasions are within the protection scope of the present invention.

Claims (9)

1. the robotization magnetization rate instrument that can survey long core sample, comprise gate-type probe (20), magnetic susceptibility meter (24) and chain conveyer, place one or more standard models on the described chain conveyer, perhaps place long core sample, various samples all pass described gate-type probe (20) successively, and described gate-type probe (20) will record one or more sample magnetic susceptibility signals and be sent to described magnetic susceptibility meter (24) and obtain data aggregation after treatment.

2. according to the described robotization magnetization rate instrument of surveying long core of claim 1, it is characterized in that: described chain conveyer comprises transmission chain (21), sprocket wheel (22), travelling belt and stepper motor (23), described travelling belt is fixed on the described transmission chain (21), by driving described sprocket wheel (22) rotation described transmission chain (21) and described travelling belt are moved at described stepper motor (23), described transmission chain (21) and described travelling belt pass described gate-type probe (20).

3. according to the described robotization magnetization rate instrument of surveying long core of claim 2, it is characterized in that: described transmission chain (21) is nonmagnetic chain.

4. according to claim 1, the 2 or 3 described robotization magnetization rate instrument of surveying long core, it is characterized in that: also comprise a control terminal, a port of described control terminal is used to control described magnetic susceptibility meter (24) and measures the measurement spacing and the measurement number of times of each long core sample or standard model and receive long core sample or the standard model magnetic susceptibility data that described magnetic susceptibility meter (24) transmits; The unlatching that the another port of described control terminal is used to control described chain conveyer stops traffic direction and the speed with described transmission chain (21).

5. according to the described robotization magnetization rate instrument of surveying long core of claim 4, it is characterized in that: described control terminal is a computing machine (25).

6. a claim 4,5 measuring method may further comprise the steps:

Step 1: the user is provided with the relevant parameter of measuring long core sample on described computing machine (25), comprises the quantity of measurement standard sample, the measurement number of times of each standard model and the measurement spacing of standard model; Or the measurement number of times of the measurement spacing of long core sample and each measurement point;

Step 2: after accomplishing the setting up, the computing machine transfer instruction is controlled described stepper motor (23), and described stepper motor (23) moves to sample by nonmagnetic transmission chain (21) and travelling belt the perform region of described gate-type probe (20);

Step 3: described computing machine (25) is according to the parameter of input in the step 1, and being calculated by program need be to the instruction code of described magnetic susceptibility meter (24) input, and described gate-type probe (20) was measured background value magnetic susceptibility earlier before measuring each long core sample: X Background magnetic susceptibility, measure each long core sample magnetic susceptibility then: X Long core sample magnetic susceptibility,

Described computing machine (25) is according to calculating each long core sample magnetic susceptibility actual value: X= X Long core sample magnetic susceptibility- X Background magnetic susceptibility

7. measuring method according to claim 6, it is characterized in that: after whenever measuring the magnetic susceptibility of a long core sample, when described gate-type probe (20) is measured background value once more and whether is produced drift with testing instruments, as taking place as if drift, can survey long core robotization magnetization rate instrument will report to the police automatically, prevent that inaccurate data from going on record.

8. lay support for one kind, be used to place claim 1-5 and can survey long core robotization magnetization rate instrument, it is characterized in that: described material of laying rack body all adopts nonmagnetic wood.

9. the support of laying according to claim 8, it is characterized in that: comprise first step (30) and second step (31), the vertical height of described first step (30) is higher than described second step (31), goes up at described first step (30) and places described gate-type probe (20); Described second step (31) is placed long core sample to be measured.

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