CN111487159B - Density measuring device based on communication technology of Internet of things - Google Patents

Abstract

The embodiment of the present invention discloses a density measurement device based on the Internet of Things communication technology, which includes a base plate on which a density measurement device is installed and a virtual demonstration module is remotely connected through the Internet of Things communication module. The density measurement device includes A column cylinder and a quantitative water tank, in the column cylinder, a recording arm, a holding arm and an ejector rod are sequentially sleeved from bottom to top through the lifting rod, the other end of the recording arm is provided with a sensor carrying position, and the other end of the holding arm is provided with a sensor carrying position. A lift control device is installed, an automatic power turntable is installed at the other end of the top rod, and the end of the lift rope is provided with a test group through an electronic dynamometer; in the present invention, various forms of experiments are set in the same group of experimental devices. The process is verified by a variety of experimental principles, and based on the Internet of Things, the experimental process is converted into a three-dimensional model. Through artificial processing, the dynamic part of the experiment can be highlighted and reproduced in the form of animation, which is convenient for students to observe and understand.

Description

A density measurement device based on Internet of Things communication technology

technical field

The embodiments of the present invention relate to the technical field of physical experiment devices, and in particular, to a density measurement device based on the communication technology of the Internet of Things.

Background technique

Physical experiments are the most intuitive teaching method to reflect physical principles and physical laws. Demonstration of some classic physical experiments or showing the details of them will help students better grasp the basic physical principles, thus laying the foundation for further study in the future. more solid foundation.

Density measurement experiment is a very classic experiment in physics teaching. Since this experiment reflects the most basic physical laws, it is used as an introductory experiment in general physics teaching for demonstration and teaching. In conventional physics experiment teaching, teachers, teaching assistants, and student representatives generally conduct experiments, while other students observe or conduct experiments in groups. It is not possible to intuitively recognize the relevant physical laws. Since the physical experimental process is procedural and cannot be reproduced, the experimental process can only be repeated continuously to meet the observation needs of students. However, due to the randomness of the experimental process, the experimental data observed each time is different. For students with poor ability, they cannot understand the above principles in a short time.

In order to overcome the above-mentioned problems, in the prior art, multimedia means are often used to record and then replay the experimental process to reproduce the experimental process, thereby helping students to further observe and understand the experimental principle. However, due to the large interference during the experiment, the traditional video recording cannot filter noise. Therefore, it is difficult to highlight the core of the experiment, and it is not convenient for the observation of the experiment. Moreover, in the existing density measurement experiment process, the density is often measured in one way, and the result cannot be verified. The measurement result is often verified against the material, which is not convenient for developing students' thinking.

With the development of the Internet of Things technology, it will become the mainstream direction to realize the reproduction and analysis of the experimental process with the help of the Internet of Things technology to help students understand the principles of classical physics experiments.

SUMMARY OF THE INVENTION

To this end, the embodiments of the present invention provide a density measurement device based on the Internet of Things communication technology, so as to solve the problems in the prior art that multimedia recording cannot reflect the core principle, noise interference, and experimental verification of the results.

In order to achieve the above object, embodiments of the present invention provide the following technical solutions:

A density measurement device based on the communication technology of the Internet of Things, comprising a base plate, an Internet of Things communication module and a density measurement device are fixedly installed on the base plate, and a virtual demonstration module is remotely connected to the Internet of Things communication module;

The density measuring device includes a column cylinder fixedly installed on the bottom plate and a quantitative water tank with different specifications arranged on the upper surface of the bottom plate through an electronic balance, and a water level measuring device is arranged on the side of the quantitative water tank. A lifting rod is movably connected inside through threaded engagement. The lifting rod is sleeved with a recording arm, a holding arm and a top rod in sequence from bottom to top. The other end of the recording arm is provided with a number of sensor carrying positions through the ring cylinder. The lifting control device is fixedly installed at the other end of the holding arm, and the automatic power turntable wound with the lifting rope is installed at the other end of the ejector rod. The lifting rope passes through the lifting control device and is connected with an electronic force gauge. The bottom end of the force gauge is provided with a group to be measured through a hook.

As a preferred solution of the present invention, the virtual demonstration module includes:

3D scanning modeling module, which scans the density measurement device in 3D through scanning equipment and builds a 3D model according to the scanning results, and identifies the action area and the static area through manual calibration;

Several receiving modules and a common data processing module;

The display module is used for projecting the data received by the receiving module processed by the data processing module into the three-dimensional model for dynamic display and restoration according to the same time axis.

As a preferred solution of the present invention, each of the receiving modules is electrically connected to the sensor disposed on the density measurement device through a data port, and each of the receiving modules is only electrically connected to the same type of sensing equipment The sensing device transmits the collected information to different receiving modules according to the same time axis, and the receiving module processes the received collected information to improve the signal-to-noise ratio and transmits it to the data processing module for superimposition. , the data processing module superimposes different types of sensing signals and projects them on the three-dimensional model for dynamic demonstration, and simultaneously displays the actual photographic images arranged according to the same time axis on the side of the three-dimensional model.

As a preferred solution of the present invention, each of the quantitative water tanks is provided with a center point, and the center point coincides with the center point of the bottom plate, the bottom area of the quantitative water tank is marked at the bottom, and the The side wall of the water tank is provided with a water level height linear ruler, and the graduation value of the water level height linear ruler increases with the increase of the bottom area of the quantitative water tank.

As a preferred solution of the present invention, the lift control device includes a floating arm mounted on the bottom of the holding arm through a hinged plate, and a calibration cylinder is fixedly mounted on the other end of the floating arm, and is mounted on the floating arm There is a level, an upper guide tube and a lower guide tube are fixedly installed on the top and bottom of the calibration cylinder, and a sleeve is fixedly installed on the top of the upper guide tube, and is installed in the sleeve by two sets of oppositely arranged return springs There is a splint, and a slot for accommodating the lifting rope is arranged between the adjacent splints;

The lower guide tube and the calibration cylinder are connected by a pan/tilt, and a perforation for accommodating the lifting rope to pass through without resistance is arranged inside the lower guide tube and the calibration cylinder, and the outer surface of the perforation located on the lower guide tube is A ring laser head is provided, and the ring laser head rotates with the rotation of the pan/tilt so that the laser direction emitted by the ring laser head is always in the vertical direction.

As a preferred solution of the present invention, a mainspring reel is fixedly installed inside the calibration cylinder, several groups of sliding grooves are arranged on the outer surface of the mainspring reel, and the inlet and outlet of the sliding grooves correspond to the upper Guide tube and lower guide tube.

As a preferred solution of the present invention, the group to be tested includes several identical blocks to be tested, and adjacent blocks to be tested are connected in series through connecting ropes of equal length in series, and the block to be tested at the end is located in series. A displacement sensor is arranged on the measuring block, and the distance between adjacent sensor positions is smaller than the vertical length of the block to be measured.

As a preferred solution of the present invention, the electronic balance is fixedly installed on the bottom plate, and a stepped annular groove is arranged on the surface of the electronic balance, and the height of the annular groove gradually increases from outside to inside Lowering, the quantitative water tanks of different specifications are respectively arranged in the annular groove.

As a preferred solution of the present invention, the water level measuring device includes an F-shaped pile fixedly installed on the bottom plate outside the electronic balance, the edge of the electronic balance is wrapped by the F-shaped pile, and the F-shaped pile passes through the surface of the F-shaped pile. A telescopic sliding guide rail is installed on the ring buckle, a depth scale is fixedly installed on the end of the guide rail, and a camera is arranged on the depth scale.

As a preferred solution of the present invention, a limiter is provided on the automatic power turntable, and the limit period of the limiter is equal to the sum of the vertical length of a connecting rope and a block to be measured.

Embodiments of the present invention have the following advantages:

In the present invention, by setting up various forms of experimental processes in the same set of experimental devices, the experimental results are measured and calculated with various experimental principles, and verified with each other, and the experimental process is converted into a three-dimensional model based on the Internet of Things. Through artificial processing in the model, the dynamic part of the experiment can be highlighted, and the dynamic part can be reproduced in the form of animation, which is convenient for students to observe and understand.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning above, any modification of the structure, the change of the proportional relationship or the adjustment of the size should still fall within the technical content disclosed in the present invention without affecting the effect and the purpose that the present invention can produce. within the range that can be covered.

Fig. 1 is the overall structure schematic diagram in the embodiment of the present invention;

2 is a schematic structural diagram of an electronic balance in an embodiment of the present invention;

3 is a schematic structural diagram of a quantitative water tank in an embodiment of the present invention;

4 is a schematic structural diagram of a lift control device in an embodiment of the present invention;

FIG. 5 is a structural block diagram of Internet of Things signal transmission in an embodiment of the present invention.

In the figure: 1- base plate; 2- Internet of things communication module; 3- density measurement device; 4- virtual demonstration module; 5- quantitative water tank; 6- lift control device;

301-electronic balance; 302-lifting rod; 303-recording arm; 304-holding arm; 305-top rod; 306-ring cylinder; 307-sensor loading position; 308-lifting rope; Dynamometer; 311-group to be tested; 315-ring groove; 316-stop;

401-3D scanning modeling module; 402-receiving module; 403-data processing module; 404-display module; 405-data port;

501-water level measuring device; 502-water level height linear ruler; 503-F-shaped pile; 504-ring buckle; 505-guide rail; 506-depth scale; 507-camera;

601-Hinged plate; 602-Floating arm; 603-Calibration cylinder; 604-Level; 605-Upper guide tube; 606-Lower guide tube; 607-Sleeve; 608-Return spring; 609-Clamp plate; ; 611 - head; 612 - ring laser head; 613 - mainspring; 614 - sliding groove.

Detailed ways

The embodiments of the present invention are described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 to FIG. 5 , the present invention provides a density measurement device based on the Internet of Things communication technology, including a base plate 1, on which the Internet of Things communication module 2 and the density measurement device 3 are fixedly installed, so that the The Internet of Things communication module 2 is remotely connected with a virtual demonstration module 4 .

In the present invention, based on the existing classical density measurement device 3, by improving the classical density measurement device 3, on the one hand, the physical principle can be more intuitively reflected, and on the other hand, additional sensors can be used to effectively carry out data in the experimental process. Video recording, and active data processing through the virtual demonstration module 4, the collected data is displayed in the form of modeling animation, which can effectively highlight the core of the physical experiment, and in the process of reproduction can also be based on Actual needs can be adjusted to meet different teaching needs.

Based on the above, the density measurement device 3 in the present invention reproduces the real density measurement process;

The Internet of Things communication module 2 transmits the collected data to the virtual demonstration module 4 for processing. The virtual demonstration module 4 will perform a series of analysis on the collected data through the built-in algorithm, and based on the principle of three-dimensional modeling, the entire experimental process will be animated. The form is reproduced, so that the core experimental process can be artificially highlighted, so that the principle can be explained in the teaching process.

The following is a specific description of the density measuring device 3 of the present invention as a specific embodiment:

The density measuring device 3 includes a column cylinder fixedly installed on the base plate 1 and a quantitative water tank 5 of different specifications arranged on the upper surface of the base plate 1 through an electronic balance 301 . The column cylinder is used to movably install the lifting rod 302 . In this embodiment, the column cylinder and the lifting rod are engaged with threads to realize the movable connection.

A recording arm 303 , a holding arm 304 and a top rod 305 are sequentially sleeved on the lifting rod 302 from bottom to top. The other end of the recording arm 303 is provided with a number of sensor holding positions 307 through a ring tube 306 . The lifting control device 6 is fixedly installed at the other end of the arm 304, and the automatic force turntable 309 is installed on the other end of the ejector rod 305, which is wound with a lifting rope 308. The lifting rope 308 passes through the lifting control device 6 and is connected to an electronic dynamometer 310. , a group to be measured 311 is provided at the bottom end of the electronic force gauge 310 through a hook.

Among them, the sensor carrier 307 is used to install a sensor or a photographing device for detecting the displacement of the group to be measured 311. In the present invention, the detection of the displacement of the group to be measured is not limited to the sensor or the photographing device, as long as it can be detected according to the set period. Electronic devices capable of acquiring displacement data can meet this requirement.

The function of the lifting control device 6 lies in three aspects: the first aspect is to keep the lifting rope at a constant degree of tightness and avoid the influence of the measurement accuracy caused by the slack of the lifting rope; the second aspect is to keep the moving speed of the lifting rope at a constant Within the controllable range, there will be no sudden change in the moving speed, and it is always within the acceptable "uniform speed" range; the third aspect is to always keep the lift rope in the vertical direction to avoid adding additional friction.

Based on the above, in the present invention, the lift control device 6 includes a floating arm 602 installed at the bottom of the holding arm 304 through a hinged plate 601, and the other end of the floating arm 602 is fixedly installed with a calibration cylinder 603, A level 604 is installed on the floating arm 602, and the floating arm 602 is adjusted by setting the level 604 and the hinge plate 601, so that the floating arm 602 is always in a horizontal state, thereby ensuring that the lift rope can be in a vertical direction.

An upper guide tube 605 and a lower guide tube 606 are fixedly installed at the top and bottom of the calibration cylinder 603, and a sleeve 607 is fixedly installed at the top of the upper guide tube 605. In the sleeve 607, two sets of oppositely arranged resets are used. The spring 608 is installed with a clamping plate 609, and between the adjacent clamping plates 609, a through groove 610 for accommodating the lifting rope 308 is provided. The adjacent splint clamps the lifting rope under the action of the return spring, which can effectively prevent the lifting rope from being too loose and ineffectively and effectively adjust the displacement of the group to be tested, which will affect the accuracy of subsequent calculations.

The lower guide tube 606 and the calibration cylinder 607 are connected by a pan/tilt 611, which is always in a vertical direction under the action of gravity through the provided pan/tilt. The lower guide tube 606 and the calibration cylinder 607 are internally provided with The hole through which the lifting rope 308 passes without resistance is accommodated. The outer surface of the hole on the lower guide tube 606 is provided with a ring laser head 612. The ring laser head 612 rotates with the rotation of the pan/tilt 611 so that the ring laser The direction of the laser light emitted by the head 612 is always in the vertical direction. Under normal circumstances, the ring laser head 612 wraps the lift rope. When the entire device is deflected, the laser generated by the ring laser head will no longer be at the edge of the lift rope. The operator can judge whether the whole device is in the horizontal state.

In this embodiment, it is necessary to ensure that the device is always in a horizontal state, because the measurement of density adopts the drainage method on the one hand, and only in a horizontal state can the volume of drainage be calculated from the height of the water level, so as to obtain the actual volume of the group to be measured. , otherwise it will affect the final measurement accuracy.

Regarding the aforementioned second aspect, the specific method of keeping the speed of the lifting rope in the controllable range in this embodiment is: a mainspring reel 613 is fixedly installed inside the calibration cylinder 607 , and a mainspring reel 613 is arranged on the outer surface of the mainspring reel 613 . Several groups of sliding grooves 614 are provided, and the inlet and the outlet of the sliding grooves 614 correspond to the upper guide pipe 605 and the lower guide pipe 606 respectively. The lifting rope is wound on the sliding groove in order. Once the speed of the lifting rope changes suddenly, a force on the mainspring will be generated, so that the mainspring will shrink. When the contraction occurs, an elastic restoring force will be generated, thus Convert the kinetic energy of the lifting rope into the elastic potential energy of the spring. After the power of the lifting rope is released, the lifting speed of the lifting rope can be effectively controlled.

In the present invention, a water level measuring device 501 is provided on the side of the quantitative water tank 5. As one of the preferred technical solutions, the quantitative water tank 5 is provided with a center point, and the center point and the center point of the bottom plate 1 Coincidence, the bottom area of the quantitative water tank 5 is marked at the bottom, and the side wall of the quantitative water tank 5 is provided with a water level height linear ruler 502, and the graduation value of the water level height linear ruler 502 follows the quantitative water tank. 5's bottom area increases and increases.

Since the bottom areas of the quantitative water tanks 5 of different specifications are not the same, in order to make the measurement of the drainage volume more accurate, a dynamic division value is used for the change of the water depth, that is, the division value of the water depth increases with the increase of the bottom area. big.

In the present invention, the water level measuring device 501 includes an F-shaped pile 503 fixedly installed on the bottom plate outside the electronic balance 301 , and the edge of the electronic balance 301 is wrapped by the F-shaped pile 503 . A telescopic and sliding guide rail 505 is installed on the surface through a loop 504 , a depth scale 506 is fixedly installed at the end of the guide rail 505 , and a camera 507 is arranged on the depth scale 506 . The comparison and cooperation between the depth scale and the water level linear scale can more accurately know the change of the water level.

The group to be tested 311 includes several identical blocks to be tested, wherein the mass of the blocks to be tested is known. As known, it can be obtained by weighing with an electronic balance.

The adjacent blocks to be tested are connected in series by connecting ropes of equal length, a displacement sensor is provided on the block to be tested at the end, and the distance between the adjacent sensor positions 307 is smaller than that of the block to be tested. The vertical length of the block.

And a limiter 316 is set on the automatic power turntable 309, and the limit period of the limiter 316 is equal to the sum of the vertical length of a connecting rope and a block to be measured.

That is, each adjustment can only adjust the displacement of one block to be measured, so as to facilitate the calculation of the mass and thus the calculation of the density.

In addition, the electronic balance 301 is fixedly installed on the base plate 1, and a stepped annular groove 315 is arranged on the surface of the electronic balance 301. The height of the annular groove 315 gradually decreases from the outside to the inside. The quantitative water tanks 5 of different specifications are respectively arranged in the annular groove 315 .

Based on the above, in the present invention, the measurement of density is mainly performed in two ways, namely, the drainage method and the mechanical calculation method. The following will combine the two methods for specific description.

Set the mass of each block to be tested as m, the number of blocks to be tested into the water as i, and the total number of blocks to be tested as n;

，其水位的高度变化为Δh；The bottom area of the quantitative water tank is

, the height change of its water level is Δh;

The depth of the center of gravity after the block to be tested enters the water is h;

The reading on the electronic dynamometer is F.

1) According to the above settings, the method of calculating the density of the block to be tested by the drainage method is:

；The density of the block to be tested is ρ=

;

2) The method to obtain the density of the block to be measured by the mechanical calculation method is:

F-(n-i) mg-img=ρgh, converted to F-nmg=ρgh;

。Calculated to get ρ=

.

It can be seen from the above that in the present invention, the density of the block to be measured can be calculated through two different principles at the same time through the same set of experimental devices, so that the measurement results can be verified from two different angles, when the two are within a reasonable error range. It can be considered that the calculation results are correct.

The verification of the results is realized by means of measurement and calculation, which enables the operator to have a more profound understanding of the physical principles demonstrated by the experiment.

The aforementioned density measurement device based on the same set of devices realizes density measurement from two different principles, in the present invention, it only solves one aspect of the technical problem in the prior art, but also needs to be considered in the present invention. It is how to realize the reproduction of the physical experiment process based on the Internet of Things.

In order to solve the above problems, the present invention also includes a virtual demonstration module 4, and the data of the virtual demonstration module 4 are all derived from data captured by various sensors and cameras.

From a specific technical solution, the virtual demonstration module 4 includes:

The three-dimensional scanning modeling module 401 performs three-dimensional scanning on the density measuring device 3 through scanning equipment, establishes a three-dimensional model according to the scanning results, and identifies the action area and the static area through manual calibration;

Several receiving modules 402 and a common data processing module 403;

The display module 404 is used for projecting the data received by the receiving module 402 processed by the data processing module 403 into the three-dimensional model for dynamic display and restoration according to the same time axis.

Wherein, each of the receiving modules 402 is electrically connected to the sensor disposed on the density measurement device 3 through the data port 405, and each of the receiving modules 402 is only electrically connected to the same type of sensing equipment, so The sensing device transmits the collected information to different receiving modules 402 according to the same time axis, and the receiving module 402 processes the received collected information to improve the signal-to-noise ratio and transmits it to the data processing module 403 for superimposition. , the data processing module 403 superimposes different types of sensing signals and projects them onto the three-dimensional model for dynamic demonstration, and simultaneously displays the actual photographic images arranged according to the same time axis on the side of the three-dimensional model.

In order to facilitate the understanding of the above-mentioned technical process, the above-mentioned process is further explained in the present invention:

Step 100: After completing the assembly of the experimental device, obtain the three-dimensional scanning results of the entire experimental device through the scanning device, and establish a three-dimensional model according to the scanning results. and the action area are identified.

Step 200: During the whole experiment, the data of the sensor and the shooting camera are all collected into the receiving module, and are transmitted to the data processing module after the noise reduction processing of the receiving module;

It should be noted in this step that the data processing needs to be concentrated on the same time axis, that is, the data of different sensors or cameras are sorted according to the same time axis, and the collected data is set according to the points of the sensors and cameras. on the location node.

Step 300: Drag the time axis to display the collected data on the three-dimensional model in the form of animation in sequence, so as to realize the reproduction of the experimental process.

And in this step, since the collection of data is continuous, the reproduction of the experimental process will also be continuously reproduced in the form of animation. Due to the use of three-dimensional modeling, what is displayed in the present invention is no longer a real object. The graph, but the model graph, can be considered as processing in the model graph, and the process of density measurement can be highlighted for students to observe. And since the time axis is controllable, the speed of its playback is also controllable.

The experimental process can be converted into a conventional video format after processing, and then spread through the Internet, so as to realize remote viewing and later replay.

In the present invention, the working mode of the virtual demonstration module 4 needs to be further supplemented and explained. The virtual demonstration module 4 scans the three-dimensional model obtained by the experimental instrument based on the scanning device, and further combines the sensor data and the camera on the basis of the three-dimensional model. Data implantation, so that the experimental process is carried out online on the 3D model. When the main experimental data nodes are determined, other data can be calculated by the interpolation method, so as to complete the accumulation of data required for the entire dynamic experiment, and then in the After rendering, a dynamic experimental process is formed.

After the dynamic experiment process is formed, the physical experiment is converted into an animation experiment on the basis of the actual measurement data. Since the simulation is performed by establishing the same time axis in the present invention, the rendered animation can be compared with the actual shooting. The process is observed synchronously, so that the key process can be highlighted, and the real experimental process can be restored according to the time axis.

In the present invention, the characteristics of the density measuring device that are different from the conventional ones include the following two aspects:

For the density measurement device, the same set of devices can be used to measure the density of various principles, which is convenient for data verification before and after operation, and in the process of verification, the collection of all data in the entire measurement process is realized, which is convenient for the entire experimental process. processing.

Based on the above, the present invention also includes the processing of experimental data. During the processing, the collected sensor data and camera data can be calculated into physical values, and through the combination of physical values and three-dimensional modeling, they can be converted into physical values. Convert it into the form of animation, and it can also take into account the real experiment while playing the animation, so as to realize the comparison between the two and complement each other's advantages. After the experiment process is digitized, distance education can be realized based on the advantages of the Internet of Things.

Based on the above, it can be seen that in the present invention, by setting up various forms of experimental processes in the same group of experimental devices, the experimental results are measured and calculated with various experimental principles, and verified with each other, and based on the Internet of Things, the experimental process is converted into Three-dimensional model, in which the dynamic part of the experiment can be highlighted through artificial processing, and the dynamic part is reproduced in the form of animation, which is convenient for students to observe and understand.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (8)

1. A density measurement device based on Internet of Things communication technology, characterized in that it comprises a base plate (1) on which an Internet of Things communication module (2) and a density measurement device (3) are fixedly installed, The Internet of Things communication module (2) is remotely connected with a virtual demonstration module (4); The density measuring device (3) comprises a column cylinder fixedly installed on the base plate (1) and quantitative water tanks (5) of different specifications arranged on the upper surface of the base plate (1) through an electronic balance (301). A water level measuring device (501) is arranged on the side of the quantitative water tank (5), and a lifting rod (302) is movably connected in the cylinder through thread engagement. The arm (303), the holding arm (304) and the ejector rod (305), the other end of the recording arm (303) is provided with several sensor holding positions (307) through the ring barrel (306). ) is fixedly installed with a lift control device (6) at the other end, and the other end of the mandrel (305) is fitted with an automatic power turntable (309) wound with a lift rope (308), the lift rope (308) passing through the lift control The device (6) is connected with an electronic dynamometer (310), and a group to be measured (311) is provided at the bottom end of the electronic dynamometer (310) through a hook; The virtual demonstration module (4) includes: A three-dimensional scanning modeling module (401), which performs three-dimensional scanning on the density measuring device (3) through a scanning device, establishes a three-dimensional model according to the scanning result, and identifies an action zone and a static zone through manual calibration; several receiving modules (402) and a common data processing module (403); a display module (404) for projecting the data received by the receiving module (402) processed by the data processing module (403) into a three-dimensional model for dynamic display and restoration according to the same time axis; Each of the receiving modules (402) is electrically connected to the sensor provided on the density measuring device (3) through the data port (405), and each of the receiving modules (402) is only connected to the same type of sensor The devices are electrically connected, and the sensing device transmits the collected information to different receiving modules (402) according to the same time axis, and the receiving module (402) processes the received collected information to improve the signal-to-noise ratio It is transmitted to the data processing module (403) for superimposition, and the data processing module (403) superimposes different types of sensing signals and projects them on the three-dimensional model for dynamic demonstration, and simultaneously displays them on the side of the three-dimensional model at the same time. Actual photograms of the axis arrangement. 2. A density measurement device based on Internet of Things communication technology according to claim 1, characterized in that the quantitative water tank (5) is provided with a center point, and the center point is connected to the bottom plate (1) The center points of the water tank (5) are coincident, the bottom area of the quantitative water tank (5) is marked at the bottom, and a water level linear ruler (502) is provided on the side wall of the quantitative water tank (5). The division value of (502) increases as the bottom area of the quantitative water tank (5) increases. 3. A density measurement device based on Internet of Things communication technology according to claim 1, characterized in that the lift control device (6) comprises a hinge plate (601) mounted on the bottom of the holding arm (304) The other end of the floating arm (602) is fixedly installed with a calibration cylinder (603), and a level (604) is installed on the floating arm (602), and the calibration cylinder (603) ) top and bottom are fixedly installed with an upper guide pipe (605) and a lower guide pipe (606), the top of the upper guide pipe (605) is fixedly installed with a sleeve (607), which passes through the sleeve (607) Two sets of oppositely arranged return springs (608) are provided with splints (609), and between adjacent splints (609) are provided with through grooves (610) for accommodating the lifting ropes (308); The lower guide tube (606) and the calibration cylinder (607) are connected through a pan/tilt (611), and the lower guide tube (606) and the calibration cylinder (607) are internally provided with accommodating lift ropes (308) passing through without resistance. A ring laser head (612) is arranged on the outer surface of the perforation on the lower guide tube (606), and the ring laser head (612) rotates with the rotation of the pan/tilt (611) so that the ring The direction of the laser light emitted by the laser head (612) is always in the vertical direction. 4. A density measurement device based on Internet of Things communication technology according to claim 3, characterized in that, a mainspring reel (613) is fixedly installed inside the calibration cylinder (607), and a mainspring reel (613) is fixedly installed in the 613) Several groups of sliding grooves (614) are provided on the outer surface, and the inlet and outlet of the sliding grooves (614) correspond to the upper guide pipe (605) and the lower guide pipe (606) respectively. 5 . The density measurement device based on Internet of Things communication technology according to claim 1 , wherein the group to be tested ( 311 ) includes several identical blocks to be tested, and adjacent to the to-be-measured block. 6 . The blocks are connected in series by connecting ropes of equal length, a displacement sensor is arranged on the block to be tested at the end, and the distance between adjacent sensor positions (307) is smaller than the vertical direction of the block to be tested. length. 6. The density measurement device based on the Internet of Things communication technology according to claim 1, wherein the electronic balance (301) is fixedly installed on the base plate (1), and the electronic balance (301) is fixedly installed on the base plate (1). 301) A stepped annular groove (315) is arranged on the surface, the height of the annular groove (315) gradually decreases from the outside to the inside, and the quantitative water tanks (5) of different specifications are respectively arranged in the annular groove. slot (315). 7. A density measurement device based on Internet of Things communication technology according to claim 1, characterized in that, the water level measurement device (501) comprises a F A shaped pile (503), the edge of the electronic balance (301) is wrapped by an F-shaped pile (503), and a telescopic sliding guide rail (505) is installed on the surface of the F-shaped pile (503) through a ring buckle (504). A depth scale (506) is fixedly installed on the end of the guide rail (505), and a camera (507) is arranged on the depth scale (506). 8. A density measurement device based on Internet of Things communication technology according to claim 5, wherein a limiter (316) is provided on the automatic power turntable (309), and the limiter (316) The limit period is equal to the sum of the vertical length of a connecting rope and a block to be tested.

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