Display sand table for engineering construction

Abstract

The utility model provides an engineering construction display sand table, which belongs to the technical field of engineering sand tables and comprises a sand table seat provided with a building model, a sunshine simulation piece arranged on the inner wall of a support, an adjusting assembly arranged on the outer wall of the support and used for adjusting the position of the sunshine simulation piece, and a movable frame rotationally arranged on the side wall of the sand table seat. The outer wall of the support is provided with an adjusting assembly for adjusting the position of the sunlight simulation piece, the trend of the sun is simulated through the arc-shaped plate, the authenticity of sunlight irradiation simulation is guaranteed, and in the process of displaying the building construction sand table, the sunlight simulation piece slides on the inner wall of the arc-shaped plate of the support through the adjusting assembly; by continuously adjusting the position of the luminous sunlight simulation piece, the influence of sunlight on construction at different positions is simulated, so that a reasonable construction plan is formulated, and the efficiency of engineering construction is ensured by planning construction in each time period.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering sand tables, in particular to an engineering construction display sand table. Background Art

[0002] The sand table is a model that is piled with mud and sand according to the topographic map. It is divided into topographic sand table, construction sand table, electronic sand table, etc. In the process of simulating the construction site, by setting the corresponding building model, you can understand the corresponding construction method, and you can also plan the construction progress through the sand table model;

[0003] The related art (publication number: CN216957284U) discloses a building display sand table for building plans, and the disclosed technical solution is: by installing a protective cloth, a first motor and a first roller, the sand table is protected from being damaged by foreign objects when not in use, the second motor rotates to drive the second roller to rotate, the second roller rotates to drive the roller to rotate, the roller rotates to drive the pull rope to move, the pull rope moves to drive the hook to move, the hook moves to drive the protective cloth to move, the protective cloth moves to drive the first roller to rotate, the first roller rotates to cover the model with the protective cloth to achieve the protection effect, the first motor rotates to drive the first roller to rotate, the first roller rotates to retract the protective cloth, and the sand table is protected from being damaged by foreign objects when not in use;

[0004] In the above disclosed technical solutions, the following problems are found in the related technologies: when planning the construction progress through the sand table model, it is impossible to determine the location and duration of sunlight exposure every day. Hot weather will have a certain impact on the health of construction workers, thereby affecting the construction progress. Therefore, choosing the right time period to construct the right project will greatly affect the construction progress. In this regard, we propose a new type of engineering construction display sand table;

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background technology section of this application, and therefore may include prior art information that does not constitute known to ordinary technicians in the field. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology. In order to solve the problem of sunlight simulation in the above-mentioned prior art, the utility model provides a construction display sand table, which adopts sunlight simulation components combined with rotating display components to achieve the effect of improving the real situation of construction. Its specific technical solution is:

[0007] A sand table for displaying engineering construction, comprising a sand table base with a building model installed, a bracket is arranged above the sand table base, a sunlight simulation piece is arranged on the inner wall of the bracket, an adjustment component for adjusting the position of the sunlight simulation piece is arranged on the outer wall of the bracket, a movable frame is rotatably arranged on the side wall of the sand table base, an electric telescopic piece is fixedly installed on the side wall of the movable frame, the free end of the electric telescopic piece is fixedly installed on the inner wall of the bracket, and a rotating drive component for rotating the movable frame is arranged on the side wall of the sand table base.

[0008] In the above technical solution, the rotating driving component includes a driving box, which is fixedly mounted on the side wall of the sand table seat, the inner wall of the driving box is rotatably provided with one end of a movable shaft, the other end of the movable shaft is rotatably provided on the side wall of the sand table seat, the side of the movable frame close to the sand table seat is sleeved on the outside of the movable shaft, the inner cavity of the driving box is rotatably provided with a driving gear, the outside of the movable shaft is sleeved with a driven gear, and the driven gear is meshed with the driving gear.

[0009] The adjustment component includes a rack and a motor. The rack is fixedly mounted on the outer wall of the bracket. A gear is sleeved on the outside of the motor output shaft. The gear is meshed with the rack. The motor is connected to the sunlight simulation component. A limiting component is set on the base of the motor.

[0010] The limiting component includes a connecting plate, and a through slot is formed on the side wall of the bracket. The connecting plate passes through the through slot and extends to the outside. The connecting plate is located on a side outside the bracket and is fixedly connected to the base of the motor. The connecting plate is located on a side inside the bracket and is fixedly connected to the sunlight simulation component. The side wall of the connecting plate is symmetrically rotated and is provided with a first guide wheel and a second guide wheel. The first guide wheel is affixed to the outer wall of the bracket, and the second guide wheel is affixed to the inner wall of the bracket.

[0011] The inner wall of the bracket is provided with a guide groove, and the second guide wheel is slidably connected to the inner wall of the guide groove.

[0012] A base is rotatably provided at the bottom of the sand table seat, and a driving component for continuously rotating the sand table seat is provided on the outer wall of the base.

[0013] The driving assembly includes a driving gear, a groove is provided on the outer wall of the base, the driving gear is rotatably arranged inside the groove, a movable seat is rotatably arranged outside the base, the movable seat is fixedly installed on the bottom of the sand table seat, and teeth are evenly arranged on the inner wall of the movable seat in a circumferential direction, and the teeth are meshed with the driving gear.

[0014] The inner wall of the movable seat is provided with a slide groove in the circumferential direction, and the outer wall of the base is provided with a plurality of movable grooves evenly in the circumferential direction, and the movable grooves correspond to the slide grooves, and balls are evenly arranged between the plurality of movable grooves and the slide grooves.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the engineering construction display sand table

[0016] 1. The movable end of the electric telescopic part drives the bracket to move, and adjusts the distance between the sunlight simulation part and the sand table. The movable frame drives the bracket to rotate by rotating the driving component, and adjusts the angle of the sunlight simulation part to the sand table, so as to simulate the changes of the four seasons more comprehensively. By adjusting the distance of sunlight exposure, the seasonal changes are truly simulated, thereby ensuring the accuracy of the construction plan.

[0017] Second, by continuously adjusting the position of the luminous sunlight simulation parts, the impact of sunlight on construction at different positions is simulated, so as to formulate a reasonable construction plan. By planning the construction in each time period, the efficiency of the project construction is guaranteed.

[0018] 3. The motor drives the sunlight simulation piece to move through the gear meshing with the rack. The different positions of the sunlight are simulated by changing the position of the sunlight simulation piece, thus bringing convenience to the construction planning process.

[0019] Fourth, the first guide wheel and the second guide wheel limit the connection plate, thereby ensuring the stability of the motor movement process, and further ensuring the stability of the sunlight simulation component position adjustment process.

[0020] 5. When simulating the sand table, the movable seat drives the sand table seat to rotate continuously in a circumferential direction through the teeth meshing with the active gear, so that the sand table can be displayed in an all-round way, which brings convenience to the explanation process of relevant personnel.

[0021] 5. In the process of rotating the movable seat to make the sand table seat rotate continuously in the circumferential direction, the stability of the rotating process of the movable seat is ensured by multiple circumferential balls, thereby ensuring the stability of the sand table display process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of an engineering construction display sand table of the utility model;

[0023] Figure 2 This is a schematic diagram of the upward structure of an engineering construction display sand table of the utility model;

[0024] Figure 3 It is a cross-sectional view of the connection relationship between the movable seat and the base;

[0025] Figure 4It is a sectional view of the drive box structure;

[0026] in, Figures 1 to 4 The correspondence between the figure numbers and the component names is: 1-sand table seat, 2-bracket, 3-rack, 4-base, 5-movable seat, 6-through slot, 7-gear, 8-sunlight simulation part, 10-motor, 11-first guide wheel, 12-second guide wheel, 13-connecting plate, 14-groove, 15-teeth, 16-movable slot, 17-driving gear, 18-guide slot, 19-slide slot, 20-ball, 21-movable frame, 22-electric telescopic part, 23-movable shaft, 24-drive box, 25-driven gear, 26-drive gear. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The following is a combination of specific implementation cases and attached Figure 1-4 The present invention is further described below, but the present invention is not limited to these embodiments.

[0029] A sand table for displaying engineering construction, including a sand table base 1 with a building model installed. A bracket 2 is arranged above the sand table base 1, a sunlight simulation piece 8 is arranged on the inner wall of the bracket 2, and an adjustment component for adjusting the position of the sunlight simulation piece 8 is arranged on the outer wall of the bracket 2. The sunlight simulation piece 8 can be a lighting lamp or other light-emitting body. The bracket 2 is an arc-shaped plate. The arc-shaped bracket 2 simulates the direction of the sun, ensuring the authenticity of the sunlight simulation. A movable frame 21 is rotatably arranged on the side wall of the sand table base 1, and the lower sides of the two movable frames 21 are respectively attached to the left and right sides of the sand table base 1 for rotation. Electric telescopic parts 22 are installed on the surfaces of the two movable frames 21, and the electric telescopic parts 22 can be electric push rods. The side wall of the movable frame 21 is fixedly installed with an electric telescopic part 22, and the free end of the electric telescopic part 22 is fixedly installed on the inner wall of the bracket 2.

[0030] The movable ends of the two electric telescopic parts 22 are parallel to each other and symmetrically fixed on the inner wall of the arc-shaped bracket 2. The electric telescopic parts 22 are electrically connected to an external power supply through a wire. After the electric telescopic parts 22 are connected to the power supply, the movable ends of the electric telescopic parts 22 drive the bracket 2 to move, thereby adjusting the distance between the sunlight simulation part 8 and the sand table, so that the changes of the four seasons can be simulated more comprehensively. By adjusting the distance of sunlight exposure, the seasonal changes are truly simulated, thereby ensuring the accuracy of the construction plan. The side wall of the sand table seat 1 is provided with a rotating driving component for rotating the movable frame 21. The rotating driving component allows the movable frame 21 to drive the bracket 2 to rotate, adjust the exposure angle of the sunlight simulation part 8 to the sand table, and adjust the angle of sunlight exposure according to the position of the earth in the four seasons, thereby ensuring the authenticity of the simulation.

[0031] With the above structure, during the display of the building construction sand table, the sunlight simulation member 8 is slid on the inner wall of the arc plate of the bracket 2 by adjusting the assembly. By continuously adjusting the position of the luminous sunlight simulation member 8, the influence of sunlight on the construction at different positions is simulated, thereby formulating a reasonable construction plan, and by planning the construction in each time period, the efficiency of the project construction is guaranteed.

[0032] Specifically, the rotating drive component includes a drive box 24, which is fixedly mounted on the side wall of the sand table seat 1. The drive box 24 is fixed at a position corresponding to the movable frame 21, and a bearing is embedded and installed on the inner wall of the drive box 24. Another bearing is embedded and installed on the surface of the sand table seat 1 opposite to the drive box 24, and the two ends of the movable shaft 23 are respectively embedded and installed inside the two bearings, and the movable shaft 23 passes through the side wall of the drive box 24 relative to the sand table seat 1 and extends to the outside. One end of the movable shaft 23 is rotatably set on the inner wall of the drive box 24, and the other end of the movable shaft 23 is rotatably set on the side wall of the sand table seat 1. The movable shaft 23 passes through the side wall of the drive box 24 and rotates in the through hole. The side of the movable frame 21 close to the sand table seat 1 is sleeved on the outside of the movable shaft 23.

[0033] A through hole is provided at a position near the bottom of the movable frame 21, so that the movable frame 21 is fixedly sleeved on the outside of the movable shaft 23 through the through hole. The movable frame 21 rotates with the movable shaft 23, and the inner cavity of the drive box 24 rotates. A driving gear 26 is provided, and a driving motor is fixedly installed at the bottom of the inner wall of the drive box 24. The driving gear 26 is fixedly sleeved on the outside of the output shaft of the driving motor through the mounting hole provided in the center, and the driving motor is electrically connected to the external power supply through a wire. A driven gear 25 is fixedly sleeved on the outside of the movable shaft 23 and at a position opposite to the driving gear 26, and the diameter of the driven gear 25 is larger than the driving gear 26. In the process of simulating the position of sunlight, it can be carried out slowly. The driven gear 25 is sleeved on the outside of the movable shaft 23, and the driven gear 25 is meshed with the driving gear 26.

[0034] By adopting the above structure, when simulating the change of seasons to adjust the sunlight exposure position, the drive motor inside the drive box 24 is connected to the power supply, so that the output shaft of the drive motor drives the drive gear 26 to rotate, and the driven gear 25 meshing with the drive gear 26 drives the movable shaft 23 to rotate, so that the movable shaft 23 drives the movable frame 21 to rotate, and the movable frame 21 drives the sunlight simulation part 8 to rotate through the bracket 2, thereby adjusting the sunlight exposure position according to the seasonal changes, and then ensuring the authenticity of the sand table display simulation process.

[0035] Wherein, the adjustment component includes a rack 3 and a motor 10, and the rack 3 is fixedly mounted on the outer wall of the bracket 2. The curvature of the arc-shaped rack 3 is the same as the curvature of the arc-shaped plate of the bracket 2, so that the arc-shaped rack 3 is fixedly fixed on the outer surface of the arc-shaped plate of the bracket 2. The outer sleeve of the output shaft of the motor 10 is provided with a gear 7. The gear 7 is fixedly sleeved on the outer surface of the output shaft of the motor 10 through a mounting hole opened in the center, so that the output shaft of the motor 10 drives the gear 7 to rotate, and the motor 10 is electrically connected to the external power supply through a wire. The gear 7 is meshed with the rack 3, the motor 10 is connected to the sunlight simulation part 8, and a limiting component is provided on the base of the motor 10. The position of the motor 10 ensures that the gear 7 is meshed with the rack 3.

[0036] By adopting the above structure, after the motor 10 is connected to the power supply, the output shaft of the motor 10 drives the gear 7 to rotate, and the gear 7 meshing with the rack 3 causes the motor 10 to drive the sunlight simulation part 8 to move. By changing the position of the sunlight simulation part 8, different positions of the sunlight are simulated, thereby bringing convenience to the construction planning process.

[0037] It is worth noting that the limiting component includes a connecting plate 13, and a through groove 6 is provided on the side wall of the bracket 2. A through groove 6 penetrating the inner cavity is provided on the surface of the arc-shaped plate of the bracket 2, that is, the through groove 6 is an arc-shaped groove. The connecting plate 13 penetrates the through groove 6 and extends to the outside, and the connecting plate 13 passes through the through groove 6 and the two sides of the connecting plate 13 are respectively placed on the inner and outer sides of the bracket 2. The side of the connecting plate 13 located outside the bracket 2 is fixedly connected to the base of the motor 10, and the side of the connecting plate 13 located inside the bracket 2 is fixedly connected to the sunlight simulation member 8.

[0038] The side wall of the connecting plate 13 is symmetrically provided with a first guide wheel 11 and a second guide wheel 12, the first guide wheel 11 is attached to the outer wall of the bracket 2, and the second guide wheel 12 is attached to the inner wall of the bracket 2. Axles are installed on the surfaces of both sides of the connecting plate 13 extending from the through slot 6. The first guide wheel 11 and the second guide wheel 12 are movably sleeved on the outside of the two axles through the mounting holes opened in the center, respectively. The first guide wheel 11 slides on the outer wall of the bracket 2, and the second guide wheel 12 slides on the inner wall of the bracket 2.

[0039] With the above structure, in the process of adjusting the sunlight simulation member 8 by meshing the rotating gear 7 with the rack 3, the first guide wheel 11 and the second guide wheel 12 slide along the inner and outer sides of the bracket 2 respectively along with the connecting plate 13. The first guide wheel 11 and the second guide wheel 12 limit the connecting plate 13, thereby ensuring the stability of the movement process of the motor 10, and further ensuring the stability of the position adjustment process of the sunlight simulation member 8.

[0040] In addition, the inner wall of the bracket 2 is provided with a guide groove 18, and the second guide wheel 12 is slidably connected to the inner wall of the guide groove 18. The groove width of the guide groove 18 corresponds to the second guide wheel 12, so that the second guide wheel 12 slides in contact with the inner wall of the guide groove 18, and the second guide wheel 12 is limited by the guide groove 18. Thus, the position of the second guide wheel 12 is prevented from being offset, thereby ensuring the accuracy of the position adjustment of the sunlight simulation member 8.

[0041] In addition, the bottom of the sand table seat 1 is rotatably provided with a base 4, and the outer wall of the base 4 is provided with a driving assembly for continuously rotating the sand table seat 1. The driving assembly enables the sand table seat 1 to continuously rotate in a circumferential direction, so that the entire building sand table can be displayed to the surrounding people in an all-round manner.

[0042] The driving assembly includes a driving gear 17, and a groove 14 is provided on the outer wall of the base 4. The driving gear 17 is rotatably arranged inside the groove 14. The driving motor is fixed on the inner wall of the groove 14 through a base, and the driving gear 17 is fixedly sleeved on the outer surface of the output shaft of the driving motor through a mounting hole provided in the center, and the driving motor is electrically connected to an external power supply through a wire. A movable seat 5 is rotatably provided on the outside of the base 4, and the movable seat 5 is fixedly installed on the bottom of the sand table seat 1. The sand table seat 1 rotates with the movable seat 5 attached to the outside of the base 4, and the inner wall of the movable seat 5 is evenly provided with teeth 15 in the circumferential direction, and the teeth 15 are meshed with the driving gear 17. A groove cavity is provided on the lower surface of the movable seat 5, and the base 4 is embedded in the groove cavity. A circle of teeth 15 are installed in sequence and continuously at a position opposite to the driving gear 17.

[0043] With the above structure, when simulating the sand table, the driving motor is connected to the power supply to rotate the driving gear 17. The movable seat 5 drives the sand table seat 1 to rotate continuously in the circumferential direction through the teeth 15 meshing with the driving gear 17, so that the sand table is displayed in all directions, which brings convenience to the explanation process of relevant personnel.

[0044] Furthermore, the inner wall of the movable seat 5 is provided with a slide groove 19 in the circumferential direction. The outer wall of the base 4 is provided with a plurality of movable grooves 16 evenly in the circumferential direction, and the movable grooves 16 correspond to the slide grooves 19, and balls 20 are evenly arranged between the plurality of movable grooves 16 and the slide grooves 19. Balls 20 are movably embedded in the movable cavity formed by each movable groove 16 and the slide groove 19. In the process of rotating the movable seat 5 to make the sand table seat 1 rotate continuously in the circumferential direction, the movable seat 5 drives the slide groove 19 of the inner wall to slide against the outside of the plurality of balls 20. At the same time, each ball 20 slides in each movable groove 16 respectively, and the stability of the rotation process of the movable seat 5 is ensured by the plurality of circumferential balls 20, thereby ensuring the stability of the sand table display process.

[0045] The present embodiment is a sand table for displaying engineering construction, and its working principle is as follows: when simulating the display of the sand table, the driving motor is connected to the power supply, so that the active gear 17 rotates, and the movable seat 5 drives the sand table seat 1 to rotate continuously in the circumferential direction through the teeth 15 meshing with the active gear 17, so that the sand table is displayed in all directions. In this process, the motor 10 is connected to the power supply, so that the output shaft of the motor 10 drives the gear 7 to rotate, and the motor 10 drives the sunlight simulation part 8 to move through the gear 7 meshing with the rack 3. Through the change of the position of the sunlight simulation part 8, different positions of sunlight are simulated, and the bracket 2 is driven to move through the movable end of the electric telescopic part 22, thereby adjusting the distance between the sunlight simulation part 8 and the sand table, and the output shaft of the driving motor drives the driving gear 26 to rotate, so that the driven gear 25 meshing with the driving gear 26 drives the movable shaft 23 to rotate, so that the movable shaft 23 drives the movable frame 21 to rotate, so that the movable frame 21 drives the sunlight simulation part 8 to rotate through the bracket 2, and the sunlight exposure position is adjusted according to seasonal changes.

[0046] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0048] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction display sand table, comprising a sand table seat (1) on which a building model is installed, a bracket (2) is arranged above the sand table seat (1), and a sunlight simulation member (8) is arranged on the inner wall of the bracket (2), characterized in that: The outer wall of the bracket (2) is provided with an adjustment component for adjusting the position of the sunlight simulation member (8); the side wall of the sand table seat (1) is rotatably provided with a movable frame (21); the side wall of the movable frame (21) is fixedly provided with an electric telescopic member (22); the free end of the electric telescopic member (22) is fixedly provided on the inner wall of the bracket (2); and the side wall of the sand table seat (1) is provided with a rotation driving component for rotating the movable frame (21).

2. The engineering construction display sand table according to claim 1 is characterized by: The rotary drive component comprises a drive box (24), the drive box (24) being fixedly mounted on the side wall of the sand table seat (1), one end of a movable shaft (23) being rotatably arranged on the inner wall of the drive box (24), the other end of the movable shaft (23) being rotatably arranged on the side wall of the sand table seat (1), the side of the movable frame (21) close to the sand table seat (1) being sleeved on the outside of the movable shaft (23), the inner cavity of the drive box (24) being rotatably arranged with a driving gear (26), the outside of the movable shaft (23) being sleeved with a driven gear (25), and the driven gear (25) being meshed with the drive gear (26).

3. The engineering construction display sand table according to claim 1, characterized in that: The adjustment assembly comprises a rack (3) and a motor (10), wherein the rack (3) is fixedly mounted on the outer wall of the bracket (2), a gear (7) is sleeved on the outside of the output shaft of the motor (10), the gear (7) is meshed with the rack (3), the motor (10) is connected to the sunlight simulation element (8), and a limiting component is arranged on the base of the motor (10).

4. The engineering construction display sand table according to claim 3 is characterized by: The limiting component includes a connecting plate (13), a through slot (6) is provided on the side wall of the bracket (2), the connecting plate (13) passes through the through slot (6) and extends to the outside, the connecting plate (13) is located on a side outside the bracket (2) and is fixedly connected to the base of the motor (10), and the connecting plate (13) is located on a side inside the bracket (2) and is fixedly connected to the sunlight simulation component (8), and the side wall of the connecting plate (13) is symmetrically provided with a first guide wheel (11) and a second guide wheel (12), the first guide wheel (11) is attached to the outer wall of the bracket (2), and the second guide wheel (12) is attached to the inner wall of the bracket (2).

5. The engineering construction display sand table according to claim 4 is characterized by: A guide groove (18) is provided on the inner wall of the bracket (2), and the second guide wheel (12) is slidably connected to the inner wall of the guide groove (18).

6. The engineering construction display sand table according to claim 1, characterized in that: A base (4) is rotatably provided at the bottom of the sand table seat (1), and a driving component for continuously rotating the sand table seat (1) is provided on the outer wall of the base (4).

7. The engineering construction display sand table according to claim 6, characterized in that: The driving assembly comprises a driving gear (17), the outer wall of the base (4) is provided with a groove (14), the driving gear (17) is rotatably arranged inside the groove (14), a movable seat (5) is rotatably arranged outside the base (4), the movable seat (5) is fixedly installed at the bottom of the sand table base (1), the inner wall of the movable seat (5) is evenly provided with teeth (15) in the circumferential direction, and the teeth (15) are meshed with the driving gear (17).

8. The engineering construction display sand table according to claim 7, characterized in that: The inner wall of the movable seat (5) is provided with a slide groove (19) in the circumferential direction, and the outer wall of the base (4) is provided with a plurality of movable grooves (16) in the circumferential direction, and the movable grooves (16) correspond to the slide grooves (19), and balls (20) are evenly arranged between the plurality of movable grooves (16) and the slide grooves (19).

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