An engineering management sand table with an adjustable usable area

Abstract

The present invention discloses a sand table for engineering management with an adjustable usable area, which comprises a base and a panel. The panel is slidably connected to the upper part of the base, and the upper surface of the panel is used for arranging the sand table. At the upper end inside the bottom, a first strip-shaped chute and a second strip-shaped chute are symmetrically arranged. A first slider is slidably connected in the first strip-shaped chute, and a second slider is slidably connected in the second strip-shaped chute. The panel comprises a first panel and a second panel. The lower surface of the first panel is fixedly connected to the first slider, and the lower surface of the second panel is fixedly connected to the second slider. A positioning plate, a lifting mechanism and a driving part are arranged in the base. The lower surface of the positioning plate is fixed to the execution end of the lifting mechanism. The lifting mechanism and the driving part are fixedly arranged in the base, and the driving part is used for driving the execution end of the lifting mechanism to move up and down in the vertical direction. The sand table for engineering management of the present invention is convenient for expanding the usable area of the sand table, and solves the problems that the existing sand table needs to be externally expanded and requires re-fixing and combination.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering sand tables, and particularly relates to an engineering management sand table with adjustable usable area. Background Art

[0002] A sand table is a model made of sediment, military chess, and other materials according to a certain proportional relationship based on topographic maps, aerial photos, or actual terrain. The terrain model represents topographic and geomorphic features in a micro-scale entity, and reflects mountains, water bodies, roads, etc. in the model. It mainly shows topographic data, enabling people to understand macroscopic things from a microscopic perspective. The application scope of terrain models is extremely wide, and the main industries using them are: government, transportation, water conservancy, electric power, public security command, land and resources, tourism, people's armed forces, military, etc.

[0003] During the use of existing sand table models, in order to better display the sand table models and their subsequent development status, it is often necessary to expand the sand table models to increase their usable area. However, most existing sand tables are of fixed structures. When expanding, new sand tables can only be added outside the whole sand table, and the new sand tables need to be re-connected and combined with the old sand tables, which is rather troublesome.

[0004] Therefore, it is necessary to provide an engineering management sand table with adjustable usable area. Summary of the Invention

[0005] The purpose of the present invention is to provide an engineering management sand table with adjustable usable area, which is convenient for expanding the usable area of the sand table, and solves the problems that the existing sand tables need to be expanded externally and require re-fixing and combination.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] An engineering management sand table with adjustable usable area includes a base and a panel. The panel is slidably connected to the upper part of the base, and the upper surface of the panel is used for arranging the sand table.

[0008] At the upper end inside the bottom, a first strip-shaped chute and a second strip-shaped chute are symmetrically opened. A first slider is slidably connected in the first strip-shaped chute, and a second slider is slidably connected in the second strip-shaped chute. The panel includes a first panel and a second panel. The lower surface of the first panel is fixedly connected to the first slider, and the lower surface of the second panel is fixedly connected to the second slider.

[0009] A positioning plate, a lifting mechanism and a driving part are arranged in the base. The lower surface of the positioning plate is fixed to the execution end of the lifting mechanism. The lifting mechanism and the driving part are fixedly arranged in the base. The output shaft of the driving motor is connected to the driving shaft of the lifting mechanism through a coupling. The free end of the lead screw of the screw jack is fixed to the lower surface of the positioning plate. The lifting mechanism can also be other devices with lifting functions such as electric telescopic rods.

[0010] Push the first panel and the second panel to the left and right. The first slider slides along the first strip-shaped chute, and the second slider moves along the second strip-shaped chute, so that the first panel and the second panel are separated from each other left and right. The position of the positioning plate is raised to be flush with the position of the panel by using a lifting device, increasing the area for placing the sand table by the area of a positioning plate.

[0011] Preferably, a first connecting plate and a second connecting plate are symmetrically inserted into both sides of the positioning plate, and a supporting block is inserted into the upper surface of the positioning plate;

[0012] The upper end of the first connecting plate is rotatably connected to a first supporting plate, and the upper end of the second connecting plate is rotatably connected to a second supporting plate. The supporting block is used to support the first supporting plate and the second supporting plate to form a set angle with the positioning plate;

[0013] A first top block is fixedly connected to the side surface of the first slider, and a second top block is fixedly connected to the side surface of the second slider. Both the first top block and the second top block are located below the panel. The end of the first top block away from the first slider is an inclined surface parallel to the first supporting plate, and the end of the second top block away from the second slider is an inclined surface parallel to the second supporting plate. The first supporting plate supports the first top block to keep it horizontal, and the second supporting plate supports the second top block to keep it horizontal.

[0014] A first connecting plate, a second connecting plate for insertion, and a support block for supporting the first support plate and the second support plate are added to the positioning plate. When the first panel and the second panel are in a state where their areas are not expanded, the first support plate supports the first top block, and the second support plate supports the second top block. When the area needs to be expanded, the driving part is activated, the lifting mechanism works, the positioning plate is lifted upward, and at the same time, the first support plate also moves upward. Since the first top block and the first support plate are in a bevel fit, the first top block moves in the horizontal direction, thereby causing the first slider to move, driving the first panel to move, and at the same time, the second panel also moves. Wait until the positioning plate rises to the same horizontal plane as the panel and stops. At this time, the support block can be removed, the first support plate is flipped to the upper end of the panel, the first panel is pulled outward, the first support plate is docked with the first panel, and similarly, the second panel is flipped to the upper end of the second panel, the second panel is pulled outward, and the second support plate is docked with the second panel. Therefore, the usable area of the sand table increases by the area of the positioning plate and further increases by the areas of the first support plate and the second support plate, further expanding the usable area of the sand table.

[0015] Preferably, the lifting mechanism is a screw jack. The output shaft of the driving part is connected to the driving shaft of the lifting mechanism through a coupling. The free end of the screw of the screw jack is fixed to the lower surface of the positioning plate. The lifting mechanism can also be other devices with a lifting function such as an electric telescopic rod.

[0016] Preferably, grooves matching the ends of the first support plate or the second support plate are provided on two side edges of the support block, and the first support plate and the second support plate are respectively clamped in the grooves on both side edges of the support block;

[0017] A first card slot is provided at the position where the first support plate is connected to the support block. A first cavity is provided at the corresponding position on the support block. A first insertion block is provided in the first card slot and the first cavity;

[0018] A second card slot is provided at the position where the second support plate is connected to the support block. A second cavity is provided at the corresponding position on the support block. A second insertion block is provided in the second card slot and the second cavity.

[0019] Preferably, a first elastic member is further provided in the first cavity. One end of the first elastic member is fixed in the first cavity, and the other end is fixed to the first insertion block; a second elastic member is further provided in the second cavity. One end of the second elastic member is fixed in the second cavity, and the other end is fixed to the second insertion block.

[0020] Preferably, the positioning plate is connected to the first connecting plate and is provided with a third cavity, and the positioning plate is connected to the second connecting plate and is provided with a fourth cavity. A first insertion rod is inserted into the first cavity, and a second insertion rod is inserted into the second cavity. A first through hole matching the first insertion rod is provided on the side wall of the first connecting plate, and the first insertion rod is embedded in the first through hole. A second through hole matching the second insertion rod is provided on the side wall of the second connecting plate, and the second insertion rod is embedded in the second through hole.

[0021] Preferably, a third elastic member is provided in the third cavity. One end of the third elastic member is fixedly connected to the inner wall of the third cavity, and the other end is fixedly connected to the first insertion rod.

[0022] A fourth elastic member is provided in the fourth cavity. One end of the fourth elastic member is fixedly connected to the inner wall of the fourth cavity, and the other end is fixedly connected to the second insertion rod.

[0023] Preferably, a fifth elastic member is further provided in the first strip-shaped chute. One end of the fifth elastic member is fixedly connected to the inner wall of the first strip-shaped chute, and the other end is fixedly connected to the first slider.

[0024] A sixth elastic member is further provided in the second strip-shaped chute. One end of the sixth elastic member is fixedly connected to the inner wall of the second strip-shaped chute, and the other end is fixedly connected to the second slider.

[0025] Preferably, a first connecting block is inserted into the side surface where the first panel and the second panel are butted. A first boss matching the first card slot is provided at the end of the first connecting block, and the first boss is embedded in the first card slot.

[0026] A second connecting block is inserted into the side surface where the second panel and the first panel are butted. A second boss matching the second card slot is provided at the end of the second connecting block, and the second boss is embedded in the second card slot.

[0027] Preferably, a switch is provided on the outer side surface of the base, and the switch is electrically connected to the driving part.

[0028] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0029] By adopting the above technical solutions, the first panel and the second panel for supporting the sand table are provided on the upper end surface of the base. The first slider is installed on the upper end of the base and connected to the first panel, and the second slider is connected to the second panel, which can maintain the stable sliding of the first panel and the second panel on the upper end surface of the base and prevent the panels from loosening from the upper end of the base. At the same time, a lifting mechanism driven by a driving part is added inside the base, and the execution end of the lifting mechanism is connected to the positioning plate, which is convenient for lifting the positioning plate and changing the expansion state of the sand table panel.

[0030] In a preferred embodiment of the present invention, a first support plate rotatably connected through a first connecting plate and a second support plate rotatably connected through a second connecting plate are installed at the upper end of the positioning plate. The upper ends of the first support plate and the second support plate are supported by support blocks. The first support plate and the second support plate form an angle with the positioning plate. A first top block is added to the side wall of the first slider, and the end of the first top block contacts the upper surface of the first support plate. When the positioning plate drives the first support plate to rise, the first support plate exerts a lateral force on the inclined surface of the side wall of the first top block, driving the first slider to move towards the outer side wall through the first top block, and the first slider drives the first panel to move outwards, thereby opening the space blocked by the first panel above the positioning plate. The second support plate, the second top block, and the second slider move in the same way, moving the second panel outwards. When the positioning plate rises to the same horizontal plane as the panel, the lifting mechanism stops working. Then, the support blocks are removed, the first support plate and the second support plate are flipped, the first support plate is docked with the first panel, and the second support plate is docked with the second panel, further expanding the use area of the sand table panel. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of a sand table for engineering management with an adjustable use area according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic structural diagram of a positioning plate assembly according to an embodiment of the present invention;

[0033] Figure 3 It is a top view after the use area of the sand table in the embodiment of the present invention is expanded Figure 1 ;

[0034] Figure 4 It is a top view after the use area of the sand table in the embodiment of the present invention is expanded Figure 2 .

[0035] Description of the reference numerals: 1 - base; 2 - first panel; 3 - second panel; 4 - first strip-shaped chute; 5 - second strip-shaped chute; 6 - first slider; 7 - second slider; 8 - positioning plate; 9 - first connecting plate; 10 - second connecting plate; 11 - first support plate; 12 - second support plate; 13 - support block; 14 - first top block; 15 - second top block; 16 - screw jack; 17 - drive motor; 18 - switch; 19 - first card slot; 20 - first plug; 21 - first cavity; 22 - second card slot; 23 - second plug; 24 - second cavity; 25 - first elastic member; 26 - second elastic member; 27 - first insertion rod; 28 - second insertion rod; 29 - third cavity; 30 - fourth cavity; 31 - third elastic member; 32 - fourth elastic member; 33 - fifth elastic member; 34 - sixth elastic member; 35 - first connecting block; 36 - first boss; 37 - second connecting block. Detailed implementation mode

[0036] The following further details a sand table for engineering management with adjustable usable area proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will be clearer according to the following description and claims.

[0037] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Refer to Figure 1 , a sand table for engineering management with adjustable usable area, including a base 1 and a panel. A storage space is provided inside the base 1, the panel is slidably connected to the upper part of the base 1, and the upper surface of the panel is used for arranging the sand table;

[0042] At the upper end of the interior of the bottom, a first strip-shaped chute 4 and a second strip-shaped chute 5 are symmetrically provided. A first slider 6 is slidably connected in the first strip-shaped chute 4, and a second slider 7 is slidably connected in the second strip-shaped chute 5. The panel includes a first panel 2 and a second panel 3. The lower surface of the first panel 2 is fixedly connected to the first slider 6, and the lower surface of the second panel 3 is fixedly connected to the second slider 7;

[0043] A positioning plate 8, a screw jack 16 and a driving motor 17 are arranged in the base 1. The screw jack 16 and the driving motor 17 are fixedly arranged in the base 1. The output shaft of the driving motor 17 is connected to the driving shaft of the screw jack 16 through a coupling. The free end of the screw of the screw jack 16 is fixed on the lower surface of the positioning plate 8. The screw jack 16 can also be other devices with lifting functions such as an electric telescopic rod. A reverse switch 18 is provided on the outer side of the base 1. The reverse switch 18 is electrically connected to the driving motor 17, and the reverse switch 18 controls the start and stop of the driving motor 17.

[0044] As Figure 1 shown, push the first panel 2 to the left and the second panel 3 to the right. The first slider 6 slides along the first strip-shaped chute 4, and the second slider 7 moves along the second strip-shaped chute 5, so that the first panel 2 and the second panel 3 are separated left and right. The position of the positioning plate 8 is raised to be flush with the position of the panel by using a lifting device, increasing the area for placing the sand table by the area of one positioning plate 8.

[0045] Refer to Figure 1 and Figure 2 , a first connecting plate 9 and a second connecting plate 10 are symmetrically inserted on both sides of the positioning plate 8, and a support block 13 is inserted on the upper surface of the positioning plate 8;

[0046] The upper end of the first connecting plate 9 is rotatably connected to a first support plate 11, the upper end of the second connecting plate 10 is rotatably connected to a second support plate 12, and the support block 13 is used to support the first support plate 11 and the second support plate 12 to form a set angle with the positioning plate 8;

[0047] A first top block 14 is fixedly connected to the side surface of the first slider 6, and a second top block 15 is fixedly connected to the side surface of the second slider 7. Both the first top block 14 and the second top block 15 are located below the panel. The end of the first top block 14 away from the first slider 6 is an inclined surface parallel to the first support plate 11, and the end of the second top block 15 away from the second slider 7 is an inclined surface parallel to the second support plate 12. The first support plate 11 supports the first top block 14 to keep it horizontal, and the second support plate 12 supports the second top block 15 to keep it horizontal.

[0048] Install the first connecting plate 9 and the second connecting plate 10 at the upper end of the positioning plate 8. The first connecting plate 9 is rotatably connected to the first support plate 11, and the second connecting plate 10 is rotatably connected to the second support plate 12. The upper ends of the first support plate 11 and the second support plate 12 are supported by the support block 13, and the first support plate 11 and the second support plate 12 form an angle with the positioning plate 8. Add a first top block 14 to the side wall of the first slider 6 and a second top block 15 to the side wall of the second slider 7. The end of the first top block 14 contacts the upper surface of the first support plate 11, and the end of the second top block 15 contacts the upper surface of the second support plate 12. When the positioning plate 8 drives the first support plate 11 and the second support plate 12 to rise, the first support plate 11 exerts a lateral force on the inclined surface of the side wall of the first top block 14, and the second support plate 12 also exerts a lateral force on the inclined surface of the side wall of the second top block 15. The first top block 14 drives the first slider 6 to move to the left, the first slider 6 drives the first panel 2 to move to the left, the second top block 15 drives the second slider 7 to move to the right, and the second slider 7 drives the second panel 3 to move to the right, thereby opening the space blocked by the first panel 2 and the second panel 3 above the positioning plate 8. When the positioning plate 8 rises to the same horizontal plane as the panel, the lifting mechanism stops working. Then remove the support block 13, flip the first support plate 11 and the second support plate 12, and dock the first support plate 11 with the first panel 2 and the second support plate 12 with the second panel 3 to further expand the use area of the sand table panel.

[0049] See Figure 2 , grooves matching the ends of the first support plate 11 or the second support plate 12 are provided on two side edges of the support block 13, and the first support plate 11 and the second support plate 12 are respectively clamped in the grooves on the two side edges of the support block 13;

[0050] A first card slot 19 is provided at the position where the first support plate 11 is connected to the support block 13, a first cavity 21 is provided at the corresponding position on the support block 13, and a first insert block 20 is provided in the first card slot 19 and the first cavity 21, and the first insert block 20 is embedded in the first card slot 19 and the first cavity 21;

[0051] A second card slot 22 is provided at the position where the second support plate 12 is connected to the support block 13, a second cavity 24 is provided at the corresponding position on the support block 13, and a second insert block 23 is provided in the second card slot 22 and the second cavity 24; A first card slot 19 is provided at the upper end of the first support plate 11, and a first insert block 20 is inserted into the upper end of the support block 13, and the first insert block 20 is embedded in the first card slot 19, which can cooperate with the support block 13 to clamp the first support plate 11 and prevent the first support plate 11 from loosening, maintaining the stability of the position of the first support plate 11 during the lifting process. The purpose of setting the second insert block 23 and the second card slot 22 is also to maintain the stability of the position of the second support plate 12 during the lifting process;

[0052] A first elastic member 25 is further provided in the first cavity 21. One end of the first elastic member 25 is fixed in the first cavity 21, and the other end is fixed to the first insertion block 20. A second elastic member 26 is further provided in the second cavity 24. One end of the second elastic member 26 is fixed in the second cavity 24, and the other end is fixed to the second insertion block 23. The first elastic member 25 can provide a certain elastic force to the first insertion block 20 to maintain the first insertion block 20 in the first card slot 19 at the top of the first support plate 11 and prevent the first support plate 11 from loosening. The purpose of setting the second elastic member 26 is also to maintain the second insertion block 23 in the second slot at the top of the second support plate 12 and prevent the second support plate 12 from loosening.

[0053] See Figure 2 , a third cavity 29 is provided at the connection between the positioning plate 8 and the first connecting plate 9, and a fourth cavity 30 is provided at the connection between the positioning plate 8 and the second connecting plate 10. A first insertion rod 27 is inserted into the first cavity 21, and a second insertion rod 28 is inserted into the second cavity 24. A first through hole matching the first insertion rod 27 is provided on the side wall of the first connecting plate 9, and the first insertion rod 27 is embedded in the first through hole. A second through hole matching the second insertion rod 28 is provided on the side wall of the second connecting plate 10, and the second insertion rod 28 is embedded in the second through hole. A third elastic member 31 is provided in the third cavity 29. One end of the third elastic member 31 is fixedly connected to the inner wall of the third cavity 29, and the other end is fixedly connected to the first insertion rod 27. A fourth elastic member 32 is provided in the fourth cavity 30. One end of the fourth elastic member 32 is fixedly connected to the inner wall of the fourth cavity 30, and the other end is fixedly connected to the second insertion rod 28.

[0054] The first connecting plate 9 and the second connecting plate 10 are symmetrically arranged. Taking the first connecting plate 9 as an example for detailed description, as Figure 2 , a third cavity 29 is provided at the connection between the positioning plate 8 and the first connecting plate 9, the first insertion rod 27 is inserted, and a first through hole is provided on the first connecting plate 9. The first insertion rod 27 is embedded in the first through hole, so that the first connecting plate 9 is stably inserted on the positioning plate 8. Further, a third elastic member 31 is provided in the third cavity 29. Under the elastic force of the third elastic member 31, the first insertion rod 27 can be maintained to pop out to the left and stably inserted into the first through hole of the first connecting plate 9. When the first connecting plate 9 needs to be taken out, only the first insertion rod 27 needs to be pushed, and the insertion rod can be separated from the first through hole, and then the first connecting plate 9 can be taken out upward.

[0055] See Figure 1 , a fifth elastic member 33 is further provided in the first strip-shaped chute 4. One end of the fifth elastic member 33 is fixedly connected to the inner wall of the first strip-shaped chute 4, and the other end is fixedly connected to the first slider 6. A sixth elastic member 34 is further provided in the second strip-shaped chute 5. One end of the sixth elastic member 34 is fixedly connected to the inner wall of the second strip-shaped chute, and the other end is fixedly connected to the second slider 7.

[0056] By setting the fifth elastic member 33 and the sixth elastic member 34, after the positioning plate 8 descends back into the base 1, the first slider 6 and the second slider 7 can slide automatically, driving the first panel 2 and the second panel 3 to close automatically.

[0057] In order to ensure that after the use area of the sand table is expanded, the first support plate 11 does not become loose after being butted with the first panel 2, and the second support plate 12 does not become loose after being butted with the second panel 3, refer to Figure 4 , a first connecting block 35 is inserted into the side surface where the first panel 2 and the second panel 3 are butted. At the end of the first connecting block 35, a first boss 36 is provided that matches the first card slot 19, and the first boss 36 is embedded in the first card slot 19; a second connecting block 37 is inserted into the side surface where the second panel 3 and the first panel 2 are butted. At the end of the second connecting block 37, a second boss that matches the second card slot 22 is provided, and the second boss is embedded in the second card slot 22. The first panel 2 and the second panel 3 are symmetrically arranged. Here, the first support plate 11 of the first panel 2 is introduced in detail. The first connecting block 35 is provided on the side wall of the first panel 2, and the first boss 36 at the end of the first connecting block 35 is inserted into the first panel 2. When the panel area needs to be expanded, the boss at the end of the first connecting block 35 is inserted outward on the side wall of the first panel 2, and then the first support plate 11 is flipped to the upper end surface of the base 1. Continue to pull the first panel 2 to the left, so that there is a certain gap between the first panel 2 and the first support plate 11. Align the end of the first connecting block 35 with the first card slot 19 at the end of the first support plate 11, and then push the first panel 2 to the right, so that the first connecting block 35 is inserted into the first card slot 19 at the end of the first support plate 11, and cooperate with the first panel 2 to clamp the first support plate 11 to prevent the first support plate 11 from becoming loose.

[0058] Refer to Figure 1 , the usage method of the sand table for engineering management with adjustable usage area in this embodiment:

[0059] During use, connect the power supply of the base 1, turn on the forward and reverse switch 18, and start the drive motor 17, so that the drive motor 17 drives the screw elevator 16 to rotate. The screw of the screw elevator 16 rises accordingly with the internal components, thereby driving the positioning plate 8 to rise and lifting the positioning plate 8 out of the base 1;

[0060] When the positioning plate 8 rises, a lateral force is applied to the inclined surface of the side wall of the first top block 14 through the first support plate 11, and a lateral force is applied to the inclined surface of the side wall of the second top block 15 through the second support plate 12. The first top block 14 drives the first slider 6 to move to the left, and the second top block 15 drives the second slider 7 to move to the right. The first slider 6 drives the first panel 2 to move to the left, and the second slider 7 drives the second panel 3 to move to the right, thereby opening the space blocked by the first panel 2 and the second panel 3 above the positioning plate 8, facilitating the rising of the positioning plate 8. When the positioning plate 8 rises to the same horizontal plane as the panel, turn off the reversing switch 18 to stop the driving motor 17 from working;

[0061] When the panel area needs to be expanded in a small range, remove the first connecting plate 9 connected to the first support plate 11, the second connecting plate 10 connected to the second support plate 12, and the support block 13 from the positioning plate 8 and place them in the storage space inside the base 1 to complete the expansion of the use area of the sand table, as Figure 3 shown;

[0062] When the panel area needs to be expanded in a large range, disconnect the connections between the first support plate 11, the second support plate 12 and the support block 13, remove the support block 13 from the positioning plate 8 and place it in the storage space inside the base 1. Then flip the first support plate 11 and dock the first support plate 11 with the first panel 2, flip the second support plate 12 and dock the second support plate 12 with the second panel 3, as Figure 4 shown, for further expanding the use area of the sand table;

[0063] When the area of the sand table panel does not need to be expanded, insert the support block 13 into the positioning plate 8, pull the first panel 2 to the left and the second panel 3 to the right, so that the first panel 2 is separated from the contact with the first support plate 11, and the second panel 3 is separated from the contact with the second support plate 12. Then rotate the first support plate 11 and the second support plate 12 so that the ends of the first support plate 11 and the second support plate 12 are docked with the support block 13. Then turn on the power supply for the reverse rotation of the driving motor 17 through the reversing switch 18, so that the driving motor 17 drives the positioning plate 8 to descend through the screw jack 16 and fall back into the interior of the base 1. The settings of the fifth elastic member 33 and the sixth elastic member 34 cause the first panel 2 and the second panel 3 to automatically close and block above the positioning plate 8.

[0064] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and their equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. An engineering management sand table with adjustable usable area, characterized in that, It includes a base and a panel. The panel is slidably connected to the upper part of the base, and the upper surface of the panel is used to arrange a sand table. At the upper end inside the base, a first strip-shaped chute and a second strip-shaped chute are symmetrically provided. A first slider is slidably connected in the first strip-shaped chute, and a second slider is slidably connected in the second strip-shaped chute. The panel includes a first panel and a second panel. The lower surface of the first panel is fixedly connected to the first slider, and the lower surface of the second panel is fixedly connected to the second slider. A positioning plate, a lifting mechanism and a driving part are arranged inside the base. The lower surface of the positioning plate is fixed to the execution end of the lifting mechanism. The lifting mechanism and the driving part are fixedly arranged inside the base. The driving part is used to drive the execution end of the lifting mechanism to move up and down in the vertical direction. A first connecting plate and a second connecting plate are symmetrically inserted on both sides of the positioning plate, and a supporting block is inserted on the upper surface of the positioning plate. The upper end of the first connecting plate is rotatably connected to a first supporting plate, and the upper end of the second connecting plate is rotatably connected to a second supporting plate. The supporting block is used to support the first supporting plate and the second supporting plate to form a set angle with the positioning plate. A first top block is fixedly connected to the side surface of the first slider, and a second top block is fixedly connected to the side surface of the second slider. Both the first top block and the second top block are located below the panel. The end of the first top block away from the first slider is an inclined surface parallel to the first supporting plate, and the end of the second top block away from the second slider is an inclined surface parallel to the second supporting plate. The first supporting plate supports the first top block to keep it horizontal, and the second supporting plate supports the second top block to keep it horizontal. Two side edges of the supporting block are provided with grooves matching the ends of the first supporting plate or the second supporting plate. The first supporting plate and the second supporting plate are respectively clamped in the grooves on both side edges of the supporting block. A first clamping groove is opened at the position where the first supporting plate is connected to the supporting block. Correspondingly, a first cavity is opened at the position on the supporting block. A first inserting block is arranged in the first clamping groove and the first cavity. A second clamping groove is opened at the position where the second supporting plate is connected to the supporting block. Correspondingly, a second cavity is opened at the position on the supporting block. A second inserting block is arranged in the second clamping groove and the second cavity. A first elastic member is further arranged in the first cavity. One end of the first elastic member is fixed in the first cavity, and the other end is fixed to the first inserting block. A second elastic member is further arranged in the second cavity. One end of the second elastic member is fixed in the second cavity, and the other end is fixed to the second inserting block. A third cavity is opened at the position where the positioning plate is connected to the first connecting plate, and a fourth cavity is opened at the position where the positioning plate is connected to the second connecting plate. A first inserting rod is inserted into the first cavity, and a second inserting rod is inserted into the second cavity. A first through hole matching the first inserting rod is opened on the side wall of the first connecting plate, and the first inserting rod is embedded in the first through hole. A second through hole matching the second inserting rod is opened on the side wall of the second connecting plate, and the second inserting rod is embedded in the second through hole. A third elastic member is disposed in the third cavity. One end of the third elastic member is fixedly connected to the inner wall of the third cavity, and the other end is fixedly connected to the first insertion rod. A fourth elastic member is disposed in the fourth cavity. One end of the fourth elastic member is fixedly connected to the inner wall of the fourth cavity, and the other end is fixedly connected to the second insertion rod.

2. The engineering management sand table with adjustable usable area according to claim 1, characterized in that, The lifting mechanism is a screw jack. The output shaft of the driving part is connected to the driving shaft of the lifting mechanism through a coupling. The free end of the screw of the screw jack is fixed to the lower surface of the positioning plate.

3. The engineering management sand table with adjustable usable area according to claim 1, characterized in that, A fifth elastic member is further disposed in the first strip-shaped chute. One end of the fifth elastic member is fixedly connected to the inner wall of the first strip-shaped chute, and the other end is fixedly connected to the first slider. A sixth elastic member is further disposed in the second strip-shaped chute. One end of the sixth elastic member is fixedly connected to the inner wall of the second strip-shaped chute, and the other end is fixedly connected to the second slider.

4. The engineering management sand table with adjustable usable area according to claim 1, characterized in that, A first connecting block is inserted into the side surface where the first panel and the second panel are butted. A first boss matching the first card slot is arranged at the end of the first connecting block, and the first boss is embedded in the first card slot. A second connecting block is inserted into the side surface where the second panel and the first panel are butted. A second boss matching the second card slot is arranged at the end of the second connecting block, and the second boss is embedded in the second card slot.

5. The engineering management sand table with adjustable usable area according to claim 1, characterized in that, A switch is arranged on the outer side surface of the base, and the switch is electrically connected to the driving part.

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