CN213957880U

CN213957880U - Geotechnical centrifuge data acquisition device

Info

Publication number: CN213957880U
Application number: CN202023091959.0U
Authority: CN
Inventors: 黎峰; 张军辉; 张石平
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-08-13
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a geotechnical centrifuge data acquisition device, including multichannel selecting device and wireless remote control case, multichannel selecting device locates between data acquisition interface and the sensor, realizes appointed passageway through wireless remote control case control multichannel selecting device and selects. The utility model discloses realized signal acquisition, storage, the demonstration to different sensors under the circumstances that geotechnological centrifuge does not shut down, avoided because geotechnological centrifuge shuts down the restart and leads to model structure stress release reload to the influence of experimental test, shortened experimental period, reduced single group test cost.

Description

Geotechnical centrifuge data acquisition device

Technical Field

The utility model belongs to the technical field of the ground, a geotechnical centrifuge data acquisition device is related to.

Background

The geotechnical engineering centrifugal simulation test method is a hot spot of competitive research in various countries at present, and the basic principle is that a test model is placed in a high gravity field generated by a centrifugal machine, so that the method has the advantages of enabling the model to be equal to a prototype in stress-strain, similar in deformation and identical in failure mechanism, and is convenient for visually researching the stress-deformation character and failure process of geotechnical engineering under the stress conditions of the prototype and the like. Due to the particularities of the operation of the geotechnical centrifuge, it must be operated at a given rotational speed (without stopping) in order to achieve test data for a certain high stress field.

As an instrument for performing a dynamic model test, a centrifuge is usually configured with a set of data acquisition systems for different signal types (voltage type, current type, strain type) sensors, and includes a data acquisition server, a data acquisition card, and a data acquisition interface connected with a certain number of voltages/currents/strains. At present, the number of test data acquisition channels of various centrifuges equipped at home and abroad is usually 100-200, and when the number of sensors required to be acquired by centrifugal model test design exceeds the number of corresponding data acquisition channels on the centrifuges, great difficulty is brought to data acquisition work.

To obtain test data for all sensors, the existing solutions are as follows:

one, multiple or multiple sets of centrifugal model tests

Geotechnical centrifugal model tests are generally divided into two tests, one non-destructive and the other destructive. The non-destructive test means that the centrifugal model material is in an elastic range in the centrifugal test, and the centrifugal model material can be restored to an initial test state after shutdown and unloading; the destructive test means that the centrifugal model material is in the elastic-plastic and plastic range in the centrifugal test and can not be recovered to the initial state after the centrifugal test is stopped and unloaded. (1) Aiming at a non-destructive centrifugal model test, all sensors which are embedded and designed can be manufactured through a centrifugal model, part of the sensors are connected in one time, the centrifugal machine is stopped after the existing data acquisition system is used for carrying out a group of test acquisition, the sensors are manually replaced, the centrifugal machine is started again to carry out the next group of centrifugal model test data acquisition, and the test data of all the sensors are acquired for multiple times. It has some problems: firstly, the shutdown and startup time of the centrifugal machine is long, so that the total time of the whole centrifugal model test is long, and the test cost is increased; secondly, the centrifuge is shut down and started, the test model is repeatedly unloaded and loaded, the stress state of the centrifuge is different from the initial state of the model, and subsequent test data are influenced to a certain extent. (2) testing against destructive centrifugation models. After one test, the centrifugal model can not be restored to the initial state, and only a plurality of centrifugal test models are manufactured to carry out a plurality of centrifugal model tests, and the test data of all sensors designed by the model tests are acquired for a plurality of times by using the existing data acquisition system. There are also some problems: firstly, 1-2 months or even longer is needed for completing the manufacture of one centrifugal model under the common condition, and the manufacture of a plurality of centrifugal test models needs several times of time and the test period is long; secondly, manufacturing a centrifugal model and embedding a sensor under the conditions of different time, different personnel and the like, wherein the molding quality of a test model and the embedding position of the sensor have certain differences, and the test data are greatly influenced.

Secondly, data acquisition equipment is added

In the beginning of design and during construction of the geotechnical centrifuge, in consideration of the function upgrade of a centrifugal test in the future, a part of space is reserved in the geotechnical centrifuge for installing other equipment, such as a signal amplifier for testing various sensors, a new acquisition technology (an image acquisition technology and a three-dimensional laser measurement technology) in a centrifugal field and the like. And the influence of a plurality of groups or a plurality of centrifugal model tests on test data is obviously larger than that of a centrifugal model test, so that the test data of all the sensors are obtained in a centrifugal test by the following method: (1) a plurality of sets of acquisition board cards and channel interfaces which are the same as those of the existing data acquisition system are added; on the basis of the existing data acquisition system, an acquisition board card and a matched channel interface which are the same as the acquisition board card are added, and the method can be perfectly consistent with the existing system. There are several problems, however: the problem of installation positions of the acquisition board card and the channel interface is solved, and although space is reserved in the centrifuge, the size of the residual space can be matched with the space for adding equipment. Taking a 64-channel dynamic and static acquisition system as an example, the size of the acquisition equipment is 1600mm × 800mm × 500mm (length × width × height), and the size of the channel interface panel is 800mm × 800mm (length × width). Secondly, the problem of the acquisition system software is that whether the existing acquisition software can be expanded or not, and whether the expanded limiting conditions can meet the test requirements predicted at this time and in the future or not is solved. (2) Adding other data acquisition equipment; with the development of science and technology, various wired/wireless acquisition devices, such as voltage/strain acquisition instruments, optical fiber modems and other wired acquisition devices, are arranged on the market, and wireless transmission devices such as WIFI, Bluetooth, 4G networks and the like are configured, so that the system is convenient and fast, and the expansion is not limited. However, other acquisition devices are used, and besides the problem of installation space which is the same as that of the added board card, whether the existing acquisition system is used or not is also existed. If the system is not used, the waste and the loss of the existing acquisition system equipment are caused; if the system is used, the compatibility and consistency of different acquisition systems, the complexity of acquisition operation and the like. For example, a DH5929N dynamic stress-strain test analysis system, each of which has at most 32 or 64 test points, and a single device (32 channels) has the size of 800mm × 700mm × 500mm (length × width × height), and can be directly installed in a standard cabinet to form an infinite multichannel dynamic strain test system; by means of gigabit Ethernet communication and network technology, unlimited channel expansion and parallel sampling may be realized, and several instruments may be synchronized with synchronous clock boxes.

In addition, besides the numerical accuracy of the data acquired by the centrifugal test, the data synchronism needs to be concerned more for the dynamic test, especially in the centrifugal field, the test frequency is increased by n times, and how to solve the synchronism problem of different devices. Meanwhile, no matter the acquisition board card and the channel interface which are consistent with the existing acquisition equipment are added, or other acquisition equipment is added, the equipment selection, bid purchase, installation and debugging and the like need larger capital cost and longer time period.

Meanwhile, in the centrifugal test process, no matter wired acquisition or wireless transmission is carried out, the acquisition instrument is required to be installed in the centrifugal machine and rotate together with the model, and whether the acquisition instrument can normally work in complex environments such as an overweight centrifugal field and dynamic vibration test interference can be avoided.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a geotechnical centrifuge data acquisition device has realized signal acquisition, storage, the demonstration to different sensors under the circumstances that geotechnical centrifuge does not shut down, has avoided because geotechnical centrifuge shuts down the restart and leads to model structure stress release reload to the influence of experimental test, has shortened test cycle, reduces the single experimental cost of group, has solved the problem that prior art exists.

The utility model provides a technical scheme be, a geotechnique's centrifuge data acquisition device, including multichannel selecting device and wireless remote control case, multichannel selecting device locates between data acquisition interface and the sensor, realizes appointed passageway through wireless remote control case control multichannel selecting device and selects.

The utility model has the advantages that:

1. the utility model discloses a data signal acquisition transmission still adopts the data acquisition system of centrifuge self-bring, increases the non-stop number between sensor and the data acquisition interface and adopts signal multichannel selecting arrangement, establishes the connection between current data acquisition system and multiunit voltage type, current type, strain type sensor, and wired transmission number is adopted signal stable, reliable, prevents effectively that data from disturbing, losing, and data acquisition is accurate, guarantees data storage, and is with low costs; the wireless remote control box is used for switching and controlling the data acquisition signal multi-channel selection device, the sensor data signal wired connection optical transceiver is converted into an optical signal, the optical signal is transmitted to the central control room data acquisition system by utilizing the optical ring, and the data signal is not interfered.

2. In the centrifugal test process, real-time signals of all sensors can be displayed on a central control room data acquisition system in batches, so that the signals of all sensors can be acquired; 200-300 groups of test data of different types and quantities of sensors can be obtained in one complete centrifugal test; only one set of non-stop number acquisition signal multi-channel selection device and wireless remote control box are added, and the cost is only 4-5 ten thousand yuan.

3. The utility model discloses utilize the current data acquisition system of centrifuge completely, need not newly-increased collection software and collection equipment, effectively solved different collection software, off-line data extraction analysis etc..

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a basic schematic diagram of an embodiment of the present invention.

Fig. 2 is a front view of a multi-channel selection device according to an embodiment of the present invention.

Fig. 3 is a back view of a multi-channel selection device according to an embodiment of the present invention.

Fig. 4 is a side view of a multiple channel selection device in an embodiment of the invention.

Fig. 5 is a top view of a multi-channel selection device in an embodiment of the invention.

FIG. 6 is a multi-channel selection controller component layout

FIG. 7 is a multi-channel selection controller circuit board layout.

FIG. 8 is a multi-channel selection controller operating schematic.

FIG. 9 is a multi-channel selection controller single set switching schematic.

Fig. 10 is a design diagram of a wireless remote control box.

Fig. 11 is a schematic diagram of signal transmission and reception of the wireless remote control box.

In the figure, 1, a data acquisition server, 2, a data acquisition interface, 3, a sensor, 4, a multi-channel selection device, 4-1, a switching power supply, 4-2, a communication plug, 5, a wireless remote control box, 7, a multi-channel selection controller, 8, an output plug, 9, an input plug, 10, a light emitting diode, 11, two-open and two-close analog switches, 12, an analog switch and 13, a single chip microcomputer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses established data acquisition system and 200 ~ 300 voltage type, current type, strain type sensor and connected, can realize collection, storage, the demonstration of 200 ~ 300 voltage type, current type, strain type sensor at geotechnique centrifuge test (do not shut down).

The embodiment of the utility model provides a geotechnical centrifuge data acquisition device, as shown in fig. 1, including multichannel selecting device 4 and wireless remote control case 5, data acquisition server 1 and data acquisition interface 2 based on current data acquisition system, data acquisition interface 2 is types such as voltage/electric current/meet an emergency, set up multichannel selecting device 4 between data acquisition interface 2 and sensor 3, realize appointed passageway through wireless remote control case 5 control multichannel selecting device 4 and select, trun into "one to many" by "one to one", thereby realize the signal acquisition of all sensors under the condition that geotechnical centrifuge does not stall, save, show.

As shown in fig. 2-5, the external dimension of the multi-channel selection device 4 is 358mm × 291mm × 102mm (length × width × height), a box body is formed by cutting and welding steel plates with a thickness of 1mm, and the bottoms of the left and right sides of the box body are respectively welded with angle steels with a length of 102mm × 30mm × 2mm (length × width × thickness) provided with two screw holes. The multichannel selector 4 is provided with 6 multichannel selector controllers 7(M1 to M6).

As shown in fig. 6-9, a multi-channel selection controller 7 has 8 channels, each channel has 6 analog switches 11 with two on/off states, one analog switch 11 with two on/off states of each channel is connected in parallel and then connected with one pin of an analog switch 12, the inlet sides of the analog switches 11 with two on/off states connected to the same pin of the analog switch 12 are connected with a group of sensors 3 in a one-to-one correspondence manner, the group of sensors 3 are used for simultaneously acquiring different parameters, and the outlet sides of the analog switches 11 with two on/off states are connected with a data acquisition interface 2; specifically, the sensors 3 are divided into 6 groups, each group has 8 sensors 3, the first group of 8 sensors 3 is respectively connected with the inlet side control pins of the first two-open two-close analog switch K1 of the first group of 8 two-open two-close analog switches 11, and so on, the 6 th group of 8 sensors 3 is respectively connected with the inlet side control pins of the sixth two-open two-close analog switch K6 of the sixth group of 8 two-open two-close analog switches 11, the first two-open two-close analog switch K1 of the 8 groups of two-open two-close analog switches 11 is connected in parallel and then connected with the first pin of the analog switch 12, and so on, the sixth two-open two-close analog switch K6 of the 8 groups of two-open two-close analog switches 11 is connected in parallel and then connected with the 6 th pin of the analog switch 12; the multi-channel selection device 4 is internally provided with a single chip microcomputer 13, the wireless remote control box 5 is in communication connection with the single chip microcomputer 13, the single chip microcomputer 13 is in circuit connection with the analog switch 12, the wireless remote control box 5 sequentially and circularly sends 6 binary signal instructions to the analog switch 12 through the single chip microcomputer 13, each binary signal instruction controls one pin of the analog switch 12 to be electrified, so that the control pin corresponding to the two-switch analog switch 11 is switched on, one two-switch analog switch 11 of each channel is electrified, the rest two-switch analog switches 11 are not electrified, and the simultaneous signal connection of a group of 8 sensors 3 is realized.

The multi-channel selection controller 7 is provided with 48 two-open two-close analog switches 11, when a group of 8 sensors 3 are switched on, each channel is provided with one two-open two-close analog switch 11 which is electrified, and the other 5 two-open two-close analog switches 11 are not electrified, so that mutual influence is avoided; the two-open two-close analog switches 11 (such as K1 and K7 in FIG. 9) of different channels are electrified simultaneously without mutual influence, and the monitoring accuracy is improved.

The output sides of 6 two-open two-close analog switches 11 of each channel are connected in parallel and then connected with an output plug 8, and all the output plugs 8 are connected with the data acquisition interface 2; the total number of the output plugs 8 on all the multi-channel selection controllers 7 is less than or equal to the total number of channels of the data acquisition system of the centrifuge, and the output plugs 8 are matched with the data acquisition interface 2 of the centrifuge. The volume of each multi-channel selection controller 7 is mainly limited by the number of the two-open two-close analog switches 11, and the number of the two-open two-close analog switches 11 is the same as that of the sensors 3; the number of the multi-channel selection controllers 7 is reduced, and the number of the analog switches 12 and the single chip microcomputer 13 can be reduced; the utility model discloses the restriction is not done to multichannel option controller 7's quantity, confirms the multichannel option controller 7 of suitable quantity according to the installation volume on the geotechnique centrifuge and the weight that can bear, has installed 6 multichannel option controller 7 in the multichannel option device 4 of this embodiment.

In this embodiment, each multichannel selection controller 7 is provided with 48 (8 groups, 6 in each group) two-open two-close analog switches 11, and the multichannel selection device 4 has 288 two-open two-close analog switches 11. Two sides of each multi-channel selection controller 7 are respectively provided with 1 group of output plugs 8 with 16 cores, 8 groups of input plugs 9 with 12 cores, 1 row of

light emitting diodes

10, 1

analog switch

12, 1

single chip microcomputer

13, 1 dial switch and 1 set of 485 signals, the model of the two-switch analog switch 11 is HRS2H-S-DC12V-N, the analog switch 12 is an 8-selected-1 analog switch with the model of ULN2803, the model of the single chip microcomputer 13 is STC12C5604-35I-SOP20, and the model of the dial switch is SW DIP-3; and a light emitting diode 10 is arranged between each two-on two-off analog switch 11 and the corresponding group of sensors 3, and different multi-channel selection controllers 7 are distinguished by different dial numbers of dial switches.

The total number of channels of the data acquisition system carried by the centrifuge is 64 channels, 8 channels are arranged in the centrifuge as a group, and each channel is subjected to signal transmission by a plus cable and a minus cable with 2 cores. The system can be combined by grouping any number of channels, and is convenient to connect and combine with a data acquisition system; the embodiment of the utility model provides a plan that every multichannel selection controller 7 connects 8 passageways, so output plug 8 is 16 cores, comprises 8 KF2EDGK-3.81-2P plugs (serial numbers A ~ H), and every KF2EDGK-3.81-2P plug all links to each other with data acquisition interface 2; similarly, an output signal can be realized with any number of input signals, the present invention selects the number of sensors/channels as 6 as the control requirement, so the input plug 9 is 12 cores, the input plug 9 is divided into 6 groups, each group of input plugs 9 is composed of 6 KF2EDGK-3.81-2P plugs (a 1-a 6, … …, H1-H6); each KF2EDGK-3.81-2P plug of the input plug 9 is connected with a data signal line '+', and '-' of the sensor 3 through hardware, and in addition, the input plug 9 and the output plug 8 realize the disconnection and connection of signals through the opening and closing of the two-open two-close analog switch 11, so that the data signal of the sensor 3 is connected with the data acquisition interface 2 of the centrifuge for data acquisition.

Each sensor 3 is connected with the control pins of the two corresponding on-off analog switches 11 through the input plug 9; each KF2EDGK-3.81-2P plug of the input plug 9 is in signal connection with only one sensor 3, and if all are full, each multi-channel selection controller 7 can be connected with 48 sensor signals, and the six multi-channel selection controllers 7 can be connected with 288 signals at most. The power supply voltage of the data acquisition system is 15V, the acquired voltage signal is-5V, the acquired current signal is 4-20 mA, the strain standard resistance is 120 omega or 350 omega, and the on resistance of each two-switch analog switch 11 is less than 50m omega through testing, so that the signals of the voltage type/current type/strain type sensor are not influenced.

As shown in fig. 10 and 11, the wireless remote control box 5 includes control module selection switches and measurement channel selection switches, and the number of the control module selection switches is the same as that of the multi-channel selection controllers 7, and the control module selection switches are used for controlling the on and off of the corresponding multi-channel selection controllers 7; the number of the measurement channel selection switches is the same as that of the two-open two-close analog switches 11, and the measurement channel selection switches are used for controlling the on and off of the two-open two-close analog switches 11. The utility model discloses wireless remote control box 5 realizes the signal transmission with required sensor collection through sending and receiving wireless data transfer radio station signal to and receive the signal that the back fed back after 4 operations of multichannel selecting device, thereby accomplish wireless multichannel selecting device 4 of controlling, realized in centrifugal test (do not shut down) 4 remote operation to multichannel selecting device.

The wireless data transmission radio station in the wireless remote control box 5 is in wireless communication (not influenced by steel structures of a centrifuge body, centrifugal test rotation, other electromagnetic signals outside a laboratory chamber and the like) with the single chip microcomputer 13 in the multi-channel selection device 4, the model of the wireless data transmission radio station is JZX878 or E32-DTU 433L30, and the COM1 single chip microcomputer transmits a target working state switching instruction to the multi-channel selection device 4 through the wireless data transmission radio station so that the corresponding multi-channel selection controller 7 works; and the switching power supply IRS-50-12 supplies power to the COM1 singlechip. In FIG. 8, SN65LBC184D is used for writing programs to the single chip microcomputer 13 by using an RS485 signal line, L7805CD2T is a voltage stabilizer, and in FIG. 9, X1-X14 represent KF2EDGK-3.81-2P plugs for input and output.

The embodiment of the utility model provides a geotechnique centrifuge's data acquisition signal multichannel selecting arrangement's that does not shut down working process:

the multichannel selection controller 7 is introduced to perform a signal selection working process by taking the selection of the channel number a signal in one output plug 8 as an example, and the engineering flows of other channel numbers (B to H) are consistent with the channel number a.

Connecting a signal cable:

(1) the signal of 6 sensors 3 is accessed to the 1 st group of input plugs 9(6 KF2EDGK-3.81-2P plugs, the numbers of which are A1-A6) corresponding to the channel number A;

(2) a KF2EDGK-3.81-2P plug of a channel number A of the output plug 8 is connected with an aviation plug (voltage/current/strain data acquisition interface) in the data acquisition interface 2 of the centrifuge;

(3) the multichannel selection controller 7 connects the 1 st group of input plugs 9 (12-core plugs) to the inlet sides of the 1 st group of 6 HRS2H-S-DC12V-N two-open and two-close analog switches 11(K1 to K6) respectively according to the specified "+", "(such as left + right-) through an autonomously developed circuit board (as shown in fig. 4), and connects the" + "," on the outlet sides of the two-open and two-close analog switches 11 in parallel with the KF2EDGK-3.81-2P plug of the channel number a of the output plug 8. The internal circuit of the circuit board which is independently developed by the multichannel selection controller 7 is connected with the singlechip 13 and the 1-in-8 analog switch 12 with the control pins of 6 two-on and two-off analog switches 11 (K1-K6). At this time, only the signal cable hardware connection of the sensor to the data acquisition system is realized.

Equipment connection:

1. the switch power supply 4-1 and the communication plug 4-2 of the multi-channel selection device 4 are arranged on the side surface of the box body. Communication plug connection 1: a power supply +; 2: power supply-; 3: RS485 +; 4: RS 485-; 5: and (4) empty feet. The communication plug is internally connected with the RS485 communication plug of the multichannel selection controller 7 and is externally connected with a wireless data transmission station.

2. The input ends of the sensors of the modules of the multi-channel selection devices M1-M6 are A1-A6, B1-B6, C1-C6, D1-D6, E1-E6, F1-F6, G1-G6 and H1-H6, and the corresponding output ends are A, B, C, D, E, F, G and H. For the same measured sensor, the input port of the sensor connected with the same number is selected, such as: a2, B2, C2, D2, E2, F2, G2, and H2.

The wireless remote control box 5 controls:

the centrifugal machine always rotates around the central shaft in the test process (does not stop), and the cable channels of the existing centrifugal machine are completely used up without reserved channels, so that the multi-channel selection device 4 cannot be controlled by a wired method, and only a wireless mode can be selected for controlling signal transmission and reception. The utility model discloses independently developed wireless remote control case 5, as shown in fig. 10, it is equipped with "control module selection" switch, "measurement channel selection" switch, "power" pilot lamp, "conveying" pilot lamp and "start switching" button. M1-M6 of the control module selection switch can be multi-option, wherein the selection is carried out when the switch is turned up, and the switch is turned off when the switch is turned down; the measuring channel selection switch is a mechanical switch and can only be selected singly, in order to avoid misoperation in the test process, 2 or more switches are arranged upwards to cause disorder of internal programs, so that the multi-channel selection device 4 is halted, and signals cannot be acquired, therefore, the selection is carried out on the upper side and the closing is carried out on the lower side based on the large number when multiple selections are set; all the sensors connected to the multichannel selection device are not connected with the acquisition system, so that a circuit is broken, no signal is fed back, and only when the measurement channel selection is carried out and the corresponding channel is connected, the signals of the sensors can be acquired by the acquisition system. The "transmission" indicator light flashes when a switching command is transmitted, and a transmission failure is often on.

1. The power supply of the multi-channel selection device 4 is switched on, all channels of the selection device are in an off state, and the power supply lamp flashes.

2. The power supply of the wireless remote control box 5 is switched on, and the green power lamp flashes.

3. Selecting control modules M1-M6 (which can be multiple options), and selecting one of the measurement channels 1-6;

4. pressing the 'start switching' and 'transmission' indicator lights to flash, and when the 'transmission' indicator lights are completely extinguished, the switching operation is completed.

5. If the 'transmission' indicator light is on constantly, which indicates transmission failure, the 'start switching' button can be pressed once again.

6. For the unselected modules, after the switching operation, all channels of the modules are in a closed state.

TABLE 1 operation instruction

Serial number	Sending commands	Return to	Remarks for note
				1	XX 10 0064 0001 02 0000 CRC	XX	10 0064 0001 CRC	Closing all channels
2	XX 10 0064 0001 02 0001 CRC	XX	10 0064 0001 CRC						Open	1 channel
				3	XX 10 0064 0001 02 0002 CRC 001	XX 10 0064 0001 CRC	Open	2 channel
4	XX 10 0064 0001 02 0003 CRC	XX	10 0064 0001 CRC						Open	3 channels
				5	XX 10 0064 0001 02 0004 CRC	XX	10 0064 0001 CRC	Open			4 channels
6	XX 10 0064 0001 02 0005 CRC	XX	10 0064 0001 CRC						Open	5 channels
				7	XX 10 0064 0001 02 0006 CRC	XX	10 0064 0001 CRC	Open			6 channels
8		XX 90 YY CRC	Instruction fault

Note: 1. XX is the ID address of the conversion unit (M1-M6);

2. CRC communication data check code;

3. YY is the exception code (01-04) in clause 8.

For example: in the measurement of the strain gauge, different resistances are connected to H1 to H6 of the same module, and the resistances of H1 to H6 are collected and recorded in advance. In actual measurement, the data on H1-H6 can be approved as the channel selection operation step.

Signal control and acquisition:

the single chip microcomputer 13 receives a control command of the wireless remote control box 5, converts the control command into a binary signal command, and sends the binary signal command to the analog switch 12, and a corresponding pin of the analog switch 12 is electrified, so that the two-switch analog switch 11 corresponding to the command controls the pin to be electrified, and the corresponding two-switch analog switch 11 is closed, so that the signal connection of a certain sensor 3 is realized, and then the signal acquisition, storage and display of the certain sensor 3 are realized through the existing data acquisition server 1. The singlechip 13 sequentially sends the remaining 5 instructions to sequentially complete signal connection of the corresponding sensors 3, so that signal acquisition, storage and display of the 6 sensors in the 1 st group are realized. The method comprises the following specific steps:

if the wireless remote control box 5 sends a command "XX 1000640001020001 CRC", the single chip microcomputer 13 converts "XX 1000640001020001 CRC" into a binary signal command "000", the single chip microcomputer 13 sends the binary signal command "000" to represent that a1 is turned on, at this time, the pin 1# of the 8-selected-1 analog switch 12 is energized to supply power to the control pin of the K1 switch of the two-open and two-close analog switch 11, the K1 switch is closed to enable the a1 plug in the input plug 9 to be physically connected with the a plug in the output plug 8, and the rest switches (K2 to K6) connected with the a plug in the output plug 8 are not energized and are all in an off state, so that the signal acquisition, storage and display of the sensor connected with the a1 plug are not affected, and the data acquisition server 1 can acquire, store and display the signal of the a plug connected with the sensor. The other measurement channels are selected in sequence, binary signal commands 001, 010, 011, 100 and 101 are sent out in sequence through a single chip microcomputer 13 to represent that A2, A3, A4, A5 and A6 sensors inserted in an input plug 9 are switched on, and an 8-to-1 analog switch 12 supplies power to control pins of K2, K3, K4, K5 and K6 of a two-switch two-close analog switch 11 in sequence, so that the K2, K3, K4, K5 and K6 switches are closed, signal connection of A2, A3, A4, A5 and A6 sensors inserted in the input plug 9 and an A plug in the output plug 8 is realized, and signal acquisition, storage and display of all sensors connected with the A2, A3, A4, A5 and A6 plugs can be realized in sequence by adopting the existing data acquisition server 1.

The switches of 1-6 paths in each multi-channel selection controller 7 are synchronously switched, each signal command is sent to be capable of switching on 8 sensors 3, for example, the ends A1-A6, B1-B6, C1-C6, D1-D6, E1-E6, F1-F6, G1-G6 and H1-H6 of the input plug 9 are respectively connected with the corresponding sensors 3, if the command of '000' is sent, when the 1 st path of sensors are selected and collected, the ends A1, B1, C1, D1, E1, F1, G1 and H1 of the input plug 9 are powered by the K1 switch control pin of the two-open-two-close analog switch 11, and are respectively connected with the A, B, C, D, E, F, G, H plug of the output plug 8 to realize signal connection, and in order to clearly observe the working condition of the multi-channel selection controller 7, the lamp number 1 of the light emitting diode 10 is normally on. By analogy, if a '001' instruction is sent out, when the 2 nd-channel sensor collection is selected, the terminals a2, B2, C2, D2, E2, F2, G2 and H2 of the input plug 9 are powered by the switch control pins K2 of the two-open two-close analog switch 11, and are respectively in signal connection with the A, B, C, D, E, F, G, H plug of the output plug 8, and at the moment, the 2 nd lamp of the light emitting diode 10 on the multi-channel selection controller 7 is normally on.

The utility model discloses a data signal acquisition transmission still adopts centrifuge from the data acquisition system in area, increases multichannel selecting arrangement in the middle of sensor and the collection end, establishes being connected between current data acquisition system and multiunit voltage type, current type, the strain type sensor through shielded cable.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The geotechnical centrifuge data acquisition device is characterized by comprising a multi-channel selection device (4) and a wireless remote control box (5), wherein the multi-channel selection device (4) is arranged between a data acquisition interface (2) and a sensor (3), and the multi-channel selection device (4) is controlled by the wireless remote control box (5) to realize the selection of an appointed channel;

a plurality of multi-channel selection controllers (7) are arranged in the multi-channel selection device (4), each multi-channel selection controller (7) comprises a single chip microcomputer (13) and is used for wirelessly receiving an instruction sent by the wireless remote control box (5), converting the instruction into a binary signal instruction and sending the binary signal instruction to the analog switch (12); each pin of the analog switch (12) is connected with the parallel connection points of the two-on and two-off analog switches (11), the inlet sides of the two-on and two-off analog switches (11) connected to the same pin of the analog switch (12) are connected with a group of sensors (3) in a one-to-one correspondence mode, the group of sensors (3) are used for simultaneously collecting different parameters, and the outlet sides of the two-on and two-off analog switches (11) are connected with the data collecting interface (2).

2. The geotechnical centrifuge data acquisition device according to claim 1, wherein each multichannel selection controller (7) has n channels, each channel has m two-open two-close analog switches (11), one two-open two-close analog switch (11) of each channel is connected with one pin of the analog switch (12) after being connected in parallel, and the inlet sides of the two-open two-close analog switches (11) connected to the same pin of the analog switch (12) are connected with a group of sensors (3) in a one-to-one correspondence manner; the total number of the channels of all the multi-channel selection controllers (7) is less than or equal to the total number of the channels of the data acquisition system of the centrifuge.

3. The geotechnical centrifuge data acquisition device according to claim 2, wherein m two-open two-close analog switches (11) of each channel are connected in parallel at the outlet side and then connected with an output plug (8), and all the output plugs (8) are connected with the data acquisition interface (2).

4. The geotechnical centrifuge data acquisition device according to claim 1, wherein the total number of output plugs (8) on all the multi-channel selection controllers (7) is smaller than or equal to the total number of channels of the data acquisition system of the centrifuge, and the output plugs (8) are matched with the data acquisition interface (2) of the centrifuge.

5. The geotechnical centrifuge data acquisition device according to claim 1, wherein a light emitting diode (10) is provided between each two-open-two-close analog switch (11) and the corresponding group of sensors (3).

6. The geotechnical centrifuge data acquisition device according to claim 1, characterized in that each sensor (3) is connected with the control pin of two corresponding open-close analog switches (11) through an input plug (9).

7. The geotechnical centrifuge data collection apparatus of claim 1 wherein the on resistance of each two-open two-close analog switch (11) is <50m Ω.

8. The geotechnical centrifuge data acquisition device according to claim 2, wherein the wireless remote control box (5) is in wireless communication connection with the single chip microcomputer (13) in the multi-channel selection device (4) through a wireless data transmission station, the wireless remote control box (5) comprises control module selection switches and measurement channel selection switches, and the number of the control module selection switches is the same as that of the multi-channel selection controllers (7) and is used for controlling the on and off of the corresponding multi-channel selection controllers (7); the number of the measuring channel selection switches is the same as the number of the two-open and two-close analog switches (11) of each channel.