Interactive sand table with engineering composite structure

Abstract

The utility model provides an interactive sand table of an engineering composite structure, which comprises a sand table supporting seat, a sand table body, a fixed display model and a composite display model, and is characterized in that the sand table body is arranged on the sand table supporting seat, and the fixed display model is arranged on the sand table body; the composite display model comprises a hiding part, a covering part and an unfolding structure; the hidden part is arranged on the sand table body; the covering part is located above the hiding part, and the orthographic projection of the covering part on the sand table body coincides with the orthographic projection of the covering part on the sand table body; the unfolding structure is connected with the hiding part and the covering part and used for driving the covering part to move so that the hiding part can be displayed or hidden. The composite display model is applied to the sand table body, the hidden part in the composite display model can be displayed or hidden according to actual display requirements, the diversity and vividness of sand table display are improved, audiences can fully understand the overall displayed project through the sand table, and the audience experience is improved. And smooth development of overall planning and coordination and communication work in the later period is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of sandboxes, and in particular to an interactive sandbox with an engineering composite structure. Background Art

[0002] The engineering display sand table has the function of centrally displaying the sub-projects in the overall project from a global perspective, such as various buildings, structures, and other infrastructure projects necessary to ensure the owner's goals, which are presented in a modular form and form an organic whole with a unified plan; however, due to the hidden nature of some sub-projects, the sand table in the related technology often omits the models of these sub-projects when designing and displaying them. However, considering the actual structure inside the engineering construction and the display needs, the sand table in the above-mentioned related technology cannot clearly display the hidden sub-projects. It is difficult for the audience to obtain relevant information about the hidden sub-projects through the sand table, which greatly reduces the display effect of the engineering sand table. Utility Model Content

[0003] In view of this, the purpose of this application is to propose an interactive sandbox of an engineering composite structure to solve some or all of the technical problems mentioned above.

[0004] Based on the above purpose, the present application provides an interactive sand table of an engineering composite structure, including a sand table support seat, a sand table body, a fixed display model and a composite display model, wherein the sand table body is arranged on the sand table support seat, and the fixed display model is arranged on the sand table body;

[0005] The composite display model includes a hidden part, a covering part and an unfolding structure; the hidden part is arranged on the sandbox body; the covering part is located above the hidden part, and its orthographic projection on the sandbox body coincides with the orthographic projection of the covering part on the sandbox body; the unfolding structure is respectively connected to the hidden part and the covering part, and is used to drive the covering part to move so that the hidden part is displayed or hidden.

[0006] From the above, it can be seen that the interactive sand table of the engineering composite structure provided by the present application can simulate the real overall project framework and perform a global display by setting a fixed display model and a composite display model on the sand table body; wherein the composite display model has a hidden part, a covering part and an unfolding structure. According to actual display needs, the unfolding structure can be used to display or hide the hidden part under the covering part, thereby improving the diversity and vividness of the sand table display, so that the audience can fully understand the overall project, which is helpful for the overall coordination and communication of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 This is a schematic diagram of the structure of the sandbox in one state in this application;

[0009] Figure 2 This is a schematic diagram of the structure of the sandbox in another state in this application;

[0010] Figure 3 It is a structural schematic diagram of the composite display model in this application;

[0011] Figure 4 It is a structural schematic diagram of the interactive device in this application;

[0012] Figure 5 This is the electrical control block diagram of the interactive device, telescopic rod, pressure switch and lighting strip in this application;

[0013] Figure 6 It is a structural schematic diagram of the composite display model and the snap-fit ​​structure in this application;

[0014] Figure 7 It is a structural schematic diagram of the fixed display model and the locking structure in this application.

[0015] Description of reference numerals:

[0016] 100. Sand table support seat;

[0017] 200, sand table body; 201, mounting slot; 202, receiving hole;

[0018] 300, fixed display model;

[0019] 400, composite display model; 410, hidden part; 420, covering part; 430, unfolding structure; 431, avoidance hole;

[0020] 500, interactive device; 510, housing; 520, control module; 530, touch display panel; 540, bracket; 550, camera; 560, micro-pan head;

[0021] 600, lighting strip;

[0022] 700, pressure switch;

[0023] 800, snap-fit ​​structure; 810, snap slot; 820, elastic member; 830, snap block; 831, arc surface. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] In the related art, due to the concealment of some sub-projects, the models of these sub-projects are usually omitted when designing and displaying engineering sand tables, and the actual structure inside the engineering construction and the display needs are used as the basis. On the one hand, the sand table mentioned above cannot clearly display the hidden sub-projects, and it is difficult for the audience to obtain relevant information about the hidden sub-projects through the sand table. On the other hand, the structure of the sand table mentioned above is relatively simple, and the auxiliary effect for technical activities such as reconnaissance, survey, design, construction, supervision and maintenance of engineering projects is not obvious, which makes it difficult to smoothly carry out the overall coordination and communication work, so the display effect is poor and the flexibility is low.

[0028] In view of this, the present application provides an interactive sandbox of an engineering composite structure, including a sandbox support base 100, a sandbox body 200, a fixed display model 300 and a composite display model 400, the sandbox body 200 is arranged on the sandbox support base 100, and the fixed display model 300 is arranged on the sandbox body 200; the composite display model 400 includes a hidden part 410, a covering part 420 and an unfolding structure 430; the hidden part 410 is arranged on the sandbox body 200; the covering part 420 is located above the hidden part 410, and the orthographic projection of the hidden part 410 on the sandbox body 200 coincides with the orthographic projection of the covering part 420 on the sandbox body 200; the unfolding structure 430 is respectively connected to the hidden part 410 and the covering part 420, and is used to drive the covering part 420 to move, so that the hidden part 410 is displayed or hidden.

[0029] like Figure 1-Figure 7 As shown, the present application provides an interactive sandbox capable of globally displaying an engineering project; the sandbox includes a sandbox support base 100, a sandbox body 200 arranged on the sandbox support base 100, and a fixed display model 300 and a composite display model 400 respectively arranged on the sandbox body 200; the sandbox support base 100 is used to bear and support the sandbox body 200, and the sandbox body 200 can simulate the topography and surrounding environment of the area where the real overall project is located and display it according to actual display needs; the fixed display model 300 and the composite display model 400 are arranged on the sandbox body 200, and the staff can select a suitable model structure as a sub-project for display according to actual display needs, so that the audience can have a deep understanding of the actual display content.

[0030] Due to the concealment of some sub-projects, it is not easy to display the hidden sub-projects during the display process; therefore, the composite display model 400 can be applied in the sandbox provided in the present application to realize the flexible display of hidden sub-projects; wherein the composite display model 400 includes a hidden part 410, a covering part 420 and an unfolding structure 430, the hidden part 410 can be used as a hidden sub-project of the overall project in the sandbox, such as an underground building, and the covering part 420 can be used as a sub-project model of the overall project in the sandbox that is visible, such as a surface building; and the orthographic projection of the covering part 420 on the sandbox body 200 coincides with the orthographic projection of the hidden part 410 on the sandbox body 200, so When the covering portion 420 is located in an area close to the hidden portion 410 and forms a continuous transition surface with the surface of the sand table body 200, the covering portion 420 can cover the hidden portion 410 and achieve a hiding effect to prevent the hidden portion 410 from leaking out; and the hidden portion 410 and the covering portion 420 are connected by an unfolding structure 430, and the unfolding structure 430 can be used to drive the covering portion 420 to move so that the covering portion 420 can move in a direction close to or away from the hidden portion 410, thereby realizing the hiding or display of the hidden portion 410, thereby improving the diversity and vividness of the engineering display sand table display, so that the audience can fully understand the overall project.

[0031] It should be noted that the sandbox provided in the present application can be selected in an appropriate size according to actual display needs. For example, the sandbox body 200 can adopt a rectangular structure of four meters by six meters; and in order to improve the vividness and diversity of the sandbox display, the surface of the sandbox body 200 can simulate the topography of the real environment, such as making mountain-shaped landforms, rivers, landscape greening, model trees and simulated grass on the surface of the sandbox body 200; in addition, in order to determine the simulation targets of each area of ​​the sandbox, signs can be designed and produced in each area. At the same time, each area can also be divided into display light sources to improve the clarity of the display process of the sandbox body 200, which will not be repeated here.

[0032] In some embodiments, the unfolding structure 430 includes a plurality of telescopic rods; the plurality of telescopic rods are fixedly connected to the hidden portion 410 and arranged in a rectangular shape, and the orthographic projection of the sandbox body 200 is covered by the covering portion 420, and the ends of the piston rods are fixedly connected to the covering portion 420; Figure 1 and Figure 3 As shown, the hidden part 410 and the covering part 420 are connected by a plurality of telescopic rods, which can drive the covering part 420 and the hidden part 410 to move closer to or away from each other, so as to drive the covering part 420 to cover or display the hidden part 410; since the plurality of telescopic rods are arranged in a rectangular shape, the firmness of the support of the covering part 420 by the unfolding structure 430 can be improved, and the stability of the driving of the covering part 420 can be improved; since the orthographic projections of the plurality of telescopic rods on the sand table body 200 are covered by the orthographic projections of the covering part 420 on the sand table body 200, so that when the hidden part 410 is in a hidden state, the telescopic rods will not be exposed to the outside, thereby improving the overall refinement of the sand table.

[0033] The telescopic rod is further described in conjunction with the aforementioned embodiment. The telescopic rod mentioned above can be selected according to the specifications and models of the sandbox. For example, an electric push rod or a lifting cylinder can be selected, both of which can achieve the effect of driving the covering part 420 to move, which will not be repeated here.

[0034] In some embodiments, the hidden portion 410 is provided with a plurality of avoidance holes 431, and the telescopic rods are disposed in the avoidance holes 431 and correspond one to one with the avoidance holes 431; Figure 3 As shown, in order to ensure the covering effect of the covering part 420 on the hidden part 410 in the composite display model 400 and improve the tightness of the adaptation of the hidden part 410 and the covering part 420 in the hidden state of the composite display model 400, the hidden part 410 can be arranged with a plurality of avoidance holes 431 in a rectangular shape, and the avoidance holes 431 and the telescopic rods are made to correspond one to one, thereby shortening the use height of the telescopic rod in the retracted state, reducing the gap between the hidden part 410 and the covering part 420, and ensuring the hiding effect of the covering part 420 on the hidden part 410.

[0035] In some embodiments, the sandbox also includes an interactive device 500 electrically connected to the telescopic rod; the interactive device 500 includes a shell 510, a control module 520 and a touch display panel 530; the control module 520 and the touch display panel 530 are both arranged in the shell 510, and the touch display panel 530 and the telescopic rod are electrically connected to the control module 520 respectively.

[0036] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the sandbox provided by the present application also includes an interactive device 500, which is electrically connected to the telescopic rod and is used to control the expansion structure 430 in the composite display model 400 to work, so that the expansion structure 430 can drive the covering part 420 to move, so as to cover or display the hidden part 410; specifically, the interactive device 500 includes a shell 510, a control module 520 and a touch display panel, and the control module 520 is electrically connected to the touch display panel 530 and the telescopic rod respectively. When it is necessary to display the hidden part 410, the touch display panel is used as an input unit to send a control instruction for adjusting the telescopic state of the telescopic rod to the control module 520. After receiving the control instruction sent by the touch panel, the control module 520 can control the piston rod of the telescopic rod to extend or shorten, and drive the covering part 420 and the hidden part 410 to move away from or approach each other, so as to achieve the purpose of displaying or hiding the hidden part 410.

[0037] In some embodiments, the interactive device 500 also includes a camera 550 and a micro gimbal 560 ; the camera 550 is disposed on the micro gimbal 560 , the micro gimbal 560 is connected to the shell 510 , and the micro gimbal 560 and the camera 550 are both electrically connected to the control module 520 .

[0038] like Figure 4 and Figure 5 As shown, the interactive device 500 provided by the present application further includes a camera 550 and a micro-pan head 560 electrically connected to the control module 520, respectively, so that the audience can obtain the local display details of the sand table through the touch display panel 530 in the interactive device 500; specifically, when using the interactive device 500 to obtain the local display details of the sand table, the audience can use the touch display panel 530 to send a viewing angle adjustment instruction and a shooting instruction to the control module 520 based on actual viewing needs. After the control module 520 receives the viewing angle adjustment instruction and the shooting instruction, the control module 520 can adjust the viewing angle and the shooting instruction based on the viewing angle adjustment instruction. The micro gimbal 560 is controlled to operate, so as to drive the camera 550 connected thereto to change the shooting angle, so that the camera 550 is deflected toward the angle indicated by the viewing angle adjustment instruction; at the same time, based on the shooting instruction, the control module 520 can control the camera 550 to shoot the sand table body 200, and the camera 550 collects the image information of the corresponding area of ​​the sand table and sends it to the control module 520. After the control module 520 receives the image information sent by the camera 550, it can be displayed through the touch display panel 530, so that the audience can clearly appreciate the local display details of the sand table.

[0039] In some embodiments, the interactive device 500 further includes a bracket 540; the bracket 540 is located beside the sand table support seat 100 and is fixedly connected to the housing 510; Figure 3As shown, in order to facilitate the use of the interactive device 500 in the sandbox and to obtain clearer local display details of the sandbox, the interactive device 500 also includes a bracket 540 arranged on the side of the sandbox support seat 100, which is used as a supporting carrier of the interactive device 500 to improve the convenience of using the interactive device 500.

[0040] In some embodiments, a lighting strip 600 and a pressure switch 700 are disposed on one side of the covering portion 420 close to the hidden portion 410, and the lighting strip 600 is connected to a power source (not marked in the figure) through the pressure switch 700;

[0041] like Figure 3 , Figure 5 and Figure 6 As shown, since the covering part 420 is located above the hidden part 410, when the covering part 420 is driven to be unfolded by the unfolding structure 430, the hidden part 410 is relatively dark in the display state due to the light shielding effect of the covering part 420, which affects the clarity of viewing the hidden part 410; by arranging a lighting strip 600 and a pressure switch 700 on one side of the covering part 420 close to the hidden part 410, and then changing the on-off state of the pressure switch 700, the lighting strip 600 can be lit when the hidden part 410 is displayed, and extinguished when it is closed; specifically, when the telescopic rod drives the covering part 420 close to the hidden part 410 and contacts it, , the hidden part 410 will apply pressure toward the pressure switch 700 to close the pressure switch 700 and disconnect the power supply from the lighting strip 600. Since the hidden part 410 is hidden and the lighting strip 600 is in the closed state, the consumption of electric energy can be reduced; when the telescopic rod drives the covering part 420 away from the hidden part 410, the hidden part 410 will remove the pressure applied to the pressure switch 700 and turn on the pressure switch 700. At this time, the power supply and the lighting strip 600 are connected, and the hidden part 410 is also in the display state, which can increase the brightness of the hidden part 410 and improve the viewing effect of the hidden part 410.

[0042] In some embodiments, the sandbox body 200 is provided with a mounting groove 201, and the hidden parts 410 of the fixed display model 300 and the composite display model 400 are both connected to the mounting groove 201 through a snap-fit ​​structure 800; wherein the snap-fit ​​structure 800 includes a snap-fit ​​groove 810, an elastic member 820 and a snap-fit ​​block 830; the side walls of the hidden parts 410 of the fixed display model 300 and the composite display model 400 are both provided with a snap-fit ​​groove 810; the inner side wall of the mounting groove 201 is provided with a receiving hole 202, and the elastic member 820 is arranged in the receiving hole 202, and is respectively connected to the inner wall of the receiving hole 202 and the snap-fit ​​block 830; the snap-fit ​​block 830 is slidably arranged in the receiving hole 202, and its side away from the elastic member 820 is a circular arc surface 831, and the circular arc surface 831 is adapted to the snap-fit ​​groove 810.

[0043] like Figure 6 and Figure 7 As shown, the sandbox provided in the present application also includes a snap-fit ​​structure 800 for detachably connecting the fixed display model 300 and the composite display model 400, so as to replace or adjust the position of the fixed display model 300 and the composite display model 400; wherein, the sandbox body 200 is provided with an installation groove 201, and the fixed display model 300 and the composite display model 400 are respectively adapted to the installation groove 201 and arranged in the installation groove 201, thereby improving the fit between the fixed display model 300 and the composite display model 400 and the sandbox body 200, while ensuring that the surface of the sandbox body 200 has good continuity.

[0044] In addition, a snap-fit ​​structure 800 is provided in the installation groove 201, and the snap-fit ​​structure 800 can be used to position and snap-fit ​​the hidden parts 410 of the fixed display model 300 and the composite display model 400 inside the installation groove 201, thereby improving the firmness of the installation of the fixed display model 300 and the composite display model 400 without increasing the difficulty of disassembly and assembly of the two. The snap-fit ​​structure 800 includes a snap-fit ​​groove 810, an elastic member 820 and a snap-fit ​​block 830. When the hidden parts 410 of the fixed display model 300 and the composite display model 400 are installed, the hidden parts 410 of the fixed display model 300 and the composite display model 400 are placed in the installation groove 201. At this time, the snap-fit ​​block 830 is installed. The elastic member 820 is squeezed by the inner wall of the groove 201 and is located in the accommodating hole 202, and the elastic member 820 is squeezed by the block 830 to shrink. When the hidden part 410 of the fixed display model 300 and the composite display model 400 is matched with the installation groove 201, and the block 830 corresponds to the slot 810, the elastic restoring force of the elastic member 820 can push the block 830 to move toward the slot 810, so that the block 830 is matched and embedded in the slot 810, thereby locking the hidden part 410 of the fixed display model 300 and the composite display model 400 in the installation groove 201, and improving the firmness of the installation of the hidden part 410 of the fixed display model 300 and the composite display model 400;

[0045] Since the structure of the card slot 810 is compatible with the structure of the card block 830, and the side of the card block 830 away from the elastic member 820 is set to an arc surface 831, when the hidden part 410 of the fixed display model 300 and the composite display model 400 is disassembled, the arc surface 831 of the card block 830 can slide relatively along the card slot 810, so that the card block 830 squeezes the elastic member 820 and withdraws from the card slot 810, thereby releasing the engaging effect of the engaging structure 800 on the hidden part 410 of the fixed display model 300 and the composite display model 400, and does not increase the difficulty of disassembling the hidden part 410 of the fixed display model 300 and the composite display model 400.

[0046] In some embodiments, a plurality of fixed display models 300 are provided, and any fixed display model 300 is one of an airport model unit, a training ground model unit, a camp model unit, and a warehouse model unit; the hidden part 410 is an underground command center model unit, and the covering part 420 is a surface command center model unit.

[0047] For example, Figure 1 and Figure 2 As shown, the sand table provided in the present application can be set as a display model of a training ground or a training camp; wherein, a plurality of fixed display models 300 can be set on the sand table as sub-projects, and for any fixed display model, it can be set to one of an airport model unit, a training ground model unit, a camp model unit and a warehouse model unit, the hidden part 410 is an underground command center model unit, and the covered part 420 is a surface command center model unit, forming a relatively complete overall project; wherein, the airport training module unit, the airport model unit, the training ground model unit, the camp model unit, the warehouse model unit, the underground command center and the surface command center can be reduced according to the corresponding buildings in the real environment, and are made in combination with software typesetting and 3D printing technology; at the same time, auxiliary display accessories can also be added to the corresponding model display area, such as adding a vehicle model in the area where the training ground simulation unit is located, laying a runway sample and adding an aircraft model in the area where the airport model unit is located, etc., which will not be repeated here.

[0048] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0049] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0050] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0052] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0053] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. An interactive sand table of engineering composite structure, characterized in that: It includes a sand table support seat, a sand table body, a fixed display model and a composite display model, wherein the sand table body is arranged on the sand table support seat, and the fixed display model is arranged on the sand table body; The composite display model includes a hidden part, a covering part and an unfolding structure; the hidden part is arranged on the sandbox body; the covering part is located above the hidden part, and its orthographic projection on the sandbox body coincides with the orthographic projection of the covering part on the sandbox body; the unfolding structure is respectively connected to the hidden part and the covering part, and is used to drive the covering part to move so that the hidden part is displayed or hidden.

2. The interactive sandbox of engineering composite structure according to claim 1, characterized in that: The deployment structure includes a plurality of telescopic rods; The plurality of telescopic rods are fixedly connected to the hidden portion and arranged in a rectangular shape, and the orthographic projection of the sandbox body is covered by the covering portion, and the ends of the piston rods thereof are fixedly connected to the covering portion.

3. The interactive sandbox of engineering composite structure according to claim 2, characterized in that: The hidden part is provided with a plurality of avoidance holes, and the telescopic rods are arranged in the avoidance holes and correspond to the avoidance holes one by one.

4. The interactive sandbox of engineering composite structure according to claim 3, characterized in that: It also includes an interaction device, which is electrically connected to the telescopic rod.

5. The interactive sandbox of engineering composite structure according to claim 4, characterized in that: The interactive device comprises a housing, a control module and a touch display panel; The control module and the touch display panel are both arranged in the housing, and the touch display panel and the telescopic rod are electrically connected to the control module respectively.

6. The interactive sandbox of engineering composite structure according to claim 5, characterized in that: The interactive device also includes a camera and a micro-pan head; The camera is arranged on the micro gimbal, the micro gimbal is connected to the shell, and the micro gimbal and the camera are both electrically connected to the control module.

7. The interactive sandbox of engineering composite structure according to claim 5, characterized in that: The interactive device also includes a bracket; The bracket is located beside the sand table support seat and is fixedly connected to the shell.

8. The interactive sandbox of engineering composite structure according to claim 5, characterized in that: A lighting strip and a pressure switch are arranged on one side of the covering portion close to the hidden portion, and the lighting strip is connected to a power source via the pressure switch.

9. The interactive sandbox of engineering composite structure according to claim 1, characterized in that: The sand table body is provided with a mounting groove, and the hidden parts of the fixed display model and the composite display model are both connected to the mounting groove through a snap-fit ​​structure; wherein the snap-fit ​​structure includes a snap-fit ​​groove, an elastic member and a snap block; The side walls of the hidden parts of the fixed display model and the composite display model are both provided with card slots; the inner side wall of the installation slot is provided with a receiving hole, the elastic member is arranged in the receiving hole, and is respectively connected to the inner wall of the receiving hole and the card block; the card block is slidably arranged in the receiving hole, and the side away from the elastic member is an arc surface, and the arc surface is adapted to the card slot.

10. The interactive sandbox of engineering composite structure according to claim 1, characterized in that: There are multiple fixed display models, any of which is an airport model unit, a training ground model unit, a camp model unit and a warehouse model unit; the hidden part is an underground command center model unit, and the covered part is a surface command center model unit.

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