Displacement regulation and control device and displacement regulation and control method

Abstract

The invention discloses a displacement regulation and control device and a displacement regulation and control method, and belongs to the technical field of solar thermal power generation fused salt storage tanks. The device comprises a displacement regulation and control mechanism assembly, a fused salt storage tank and a storage tank foundation; the fused salt storage tank is arranged on the upper surface of the storage tank foundation, and the storage tank foundation is arranged on the upper surface of the displacement regulation and control mechanism assembly; the displacement regulation and control mechanism assembly comprises a supporting platform, a center displacement adjustment sub-mechanism, four sets of outer edge displacement adjustment sub-mechanisms, four sets of groove guide rails, four sets of convex guide rails and a guide rail connecting assembly. The supporting platform is jointly supported by the center displacement adjusting sub-mechanism and the four sets of outer edge displacement adjusting sub-mechanisms, the four sets of outer edge displacement adjusting sub-mechanisms are connected with the groove guide rails at the corresponding positions respectively, the four sets of groove guide rails are connected with the four sets of convex guide rails in an embedded mode respectively, and the four sets of convex guide rails are fixedly connected through the guide rail connecting assembly. According to the invention, the rule of the stress change of the fused salt storage tank caused by the displacement change of the storage tank foundation can be tested in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of molten salt storage tanks for solar thermal power generation, and particularly relates to a displacement control device and a displacement control method. Background Art

[0002] Molten salt heat storage is the mainstream heat storage technology in existing commercial solar thermal power plants. The molten salt storage tank is one of the key components of the heat storage system. Its operating temperature reaches 565°C, and the effective volume of the molten salt storage tank is nearly 20,000 cubic meters, which can hold about 30,000 tons of molten salt. Its weight is borne by the storage tank foundation. Therefore, the quality, strength, and stiffness of the storage tank foundation have an important impact on whether the molten salt storage tank can maintain good mechanical properties. If the storage tank foundation undergoes deformation or uneven settlement displacement, it will cause corresponding deformation or displacement of the molten salt storage tank, damage the mechanical properties of the molten salt storage tank, and cause failure phenomena such as structural cracks or even fractures in the molten salt storage tank, forcing the power station to shut down and causing huge economic losses. Therefore, studying the influence law of the settlement displacement and deformation of the storage tank foundation on the mechanical properties of the molten salt storage tank is crucial for optimizing the design of the molten salt storage tank structure and improving the operation reliability of the molten salt storage tank.

[0003] In the existing molten salt storage tanks operating in solar thermal power plants, settlement observation holes for the storage tank foundation are provided. However, the occurrence of settlement displacement of the storage tank foundation is accidental, diverse, and uncertain, and a long observation period is required to master the change in the mechanical properties of the molten salt storage tank caused by the actual deformation or settlement displacement of the storage tank foundation. The above method is not conducive to efficiently and accurately studying the change in the mechanical properties of the molten salt storage tank caused by various displacement forms of the storage tank foundation and its impact on the service life of the molten salt storage tank. Summary of the Invention

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A displacement control device includes: a displacement control mechanism assembly, a molten salt storage tank, and a storage tank foundation; the molten salt storage tank is placed on the upper surface of the storage tank foundation, and the storage tank foundation is placed on the upper surface of the displacement control mechanism assembly; wherein, the displacement control mechanism assembly includes a support platform, a central displacement adjustment sub-mechanism, four groups of outer edge displacement adjustment sub-mechanisms, four groups of groove rails, four groups of convex rails, and a rail connection assembly; the support platform is jointly supported by the central displacement adjustment sub-mechanism and the four groups of outer edge displacement adjustment sub-mechanisms in a five-point distribution arrangement. The four groups of outer edge displacement adjustment sub-mechanisms are respectively connected to the groove rails at the corresponding positions. The four groups of groove rails and the four groups of convex rails are respectively connected in an embedded manner, and the rail connection assembly fixes the four groups of convex rails together to form a stable support structure.

[0006] A displacement regulation method for the displacement regulation device includes: respectively rotating the edge long nuts located at the first corner position and the third corner position to raise the first corner position and the third corner position of the support platform to the same height, and simultaneously rotating the edge long nuts located at the second corner position and the fourth corner position to lower the second corner position and the fourth corner position of the support platform to the same height, so that the coordinate axes OX and OZ are respectively rotated to OX' and OZ', realizing that the displacement regulation device simulates the angular displacement of the storage tank foundation.

[0007] A displacement regulation method for the displacement regulation device includes: rotating the central long nut down to a certain height while keeping the four edge long nuts stationary, or keeping the central long nut stationary and raising the four edge long nuts to a certain height to form an upward concave surface on the surface of the support platform, realizing that the displacement regulation device simulates the upward concave surface displacement of the storage tank foundation; or rotating the central long nut up to a certain height while keeping the four edge long nuts stationary, or keeping the central long nut stationary and lowering the four edge long nuts to a certain height to form a downward concave surface on the surface of the support platform, realizing that the displacement regulation device simulates the downward concave surface displacement of the storage tank foundation, and realizing that the displacement regulation device simulates the central collapse and peripheral collapse of the storage tank foundation.

[0008] The present invention has the following beneficial effects:

[0009] 1. For the displacement regulation device of the present invention, by arranging a plurality of outer edge displacement adjustment sub - mechanisms and a central displacement adjustment sub - mechanism installed in parallel, the long nuts used for adjusting displacement are connected to the ball - head rod by bearings, and the rotation of the long nuts can be manually or automatically controlled to generate a displacement amount, and the regulation is labor - saving and efficient.

[0010] 2. The displacement regulation device of the present invention can simulate the planar tilt displacement and the concave surface displacement in the form of collapse of the storage tank foundation, meet the research requirements of the mechanical properties of the molten salt storage tank caused by various displacement conditions of the storage tank foundation, and provide a relatively comprehensive research basis for the structural design optimization of the molten salt storage tank and the storage tank foundation.

[0011] 3. The displacement regulation device of the present invention is provided with an inclination sensor and a stress sensor, which can real - time test the law of stress change of the molten salt storage tank caused by the displacement change of the storage tank foundation, and can provide a reference for the construction of the safety operation monitoring system of the molten salt storage tank for solar thermal power plants. Description of the Drawings

[0012] Figure 1Front view of the displacement control device, where 1 - displacement control mechanism assembly, 2 - molten salt storage tank, 3 - storage tank foundation, 11 - support platform, 12 - central displacement adjustment sub - mechanism, 13 - outer edge displacement adjustment sub - mechanism, 14 - groove guide rail, 15 - convex guide rail, 16 - guide rail connection component, 17 - inclination sensor, 21 - stress sensor, Z - Z axis, X - X axis, O - center of the lower surface of the support platform;

[0013] Figure 2 Top view of the displacement control device, where 2 - molten salt storage tank, 3 - storage tank foundation, 11 - support platform, 17 - inclination sensor, 21 - stress sensor;

[0014] Figure 3 Front view of the displacement control mechanism assembly, where 11 - support platform, 12 - central displacement adjustment sub - mechanism, 13 - outer edge displacement adjustment sub - mechanism, 14 - groove guide rail, 15 - convex guide rail, 16 - guide rail connection component, 17 - inclination sensor, Z - Z axis, O - center of the lower surface of the support platform;

[0015] Figure 4 Top view of the displacement control mechanism assembly, where 11 - support platform, 12 - central displacement adjustment sub - mechanism, 13 - outer edge displacement adjustment sub - mechanism, 14 - groove guide rail, 15 - convex guide rail, 16 - guide rail connection component, 17 - inclination sensor, A1 - first corner position, A2 - second corner position, A3 - third corner position, A4 - fourth corner position, X - X axis, Y - Y axis, O - center of the lower surface of the support platform;

[0016] Figure 5 Front view of the central displacement adjustment sub - mechanism, where 11 - support platform, 12 - central displacement adjustment sub - mechanism, 121 - central ball - head rod, 122 - central bearing, 123 - central long nut, 124 - central screw, 125 - central base;

[0017] Figure 6 Front sectional view of the edge displacement adjustment sub - mechanism, where 11 - support platform, 13 - outer edge displacement adjustment sub - mechanism, 14 - groove guide rail, 15 - convex guide rail, 131 - edge ball - head rod, 132 - edge bearing, 133 - edge long nut, 134 - edge screw, 135 - edge slider, 141 - upper groove, 142 - lower groove;

[0018] Figure 7 C - C sectional view of the edge displacement adjustment sub - mechanism, 14 - groove guide rail, 15 - convex guide rail, 134 - edge screw, 135 - edge slider, 141 - upper groove, Y - Y axis;

[0019] Figure 8Schematic diagram of the connection between the convex guide rail and the guide rail connection assembly. Among them, 14 - grooved guide rail, 15 - convex guide rail, 16 - guide rail connection assembly, 161 - cross-shaped member, A1 - first corner position, A2 - second corner position, A3 - third corner position, A4 - fourth corner position, X - X axis, Y - Y axis, O - center of the lower surface of the support platform;

[0020] Figure 9 Schematic diagram of the displacement control device simulating the angular displacement of the storage tank foundation. Among them, 2 - molten salt storage tank, 3 - storage tank foundation, 11 - support platform, 14 - grooved guide rail, 15 - convex guide rail, 16 - guide rail connection assembly, 17 - tilt sensor, 21 - stress sensor, 123 - central long nut, 133 - edge long nut, A1 - first corner position, A2 - second corner position, A3 - third corner position, A4 - fourth corner position, X - X axis, X' - X axis after angular displacement occurs, Z - Z axis, Z' - Z axis after angular displacement occurs, O - center of the lower surface of the support platform;

[0021] Figure 10 Schematic diagram of the displacement control device simulating the central collapse of the storage tank foundation. Among them, 2 - molten salt storage tank, 3 - storage tank foundation, 11 - support platform, 14 - grooved guide rail, 15 - convex guide rail, 16 - guide rail connection assembly, 17 - tilt sensor, 21 - stress sensor, 123 - central long nut, 133 - edge long nut, A1 - first corner position, A2 - second corner position, A3 - third corner position, A4 - fourth corner position, O - center of the lower surface of the support platform, O' - center of the lower surface of the support platform after the central collapse of the storage tank foundation, X - X axis, Z - Z axis;

[0022] Figure 11 Schematic diagram of the displacement control device simulating the peripheral collapse of the storage tank foundation. Among them, 2 - molten salt storage tank, 3 - storage tank foundation, 11 - support platform, 14 - grooved guide rail, 15 - convex guide rail, 16 - guide rail connection assembly, 17 - tilt sensor, 21 - stress sensor, 123 - central long nut, 133 - edge long nut, A1 - first corner position, A2 - second corner position, A3 - third corner position, A4 - fourth corner position, A1' = first corner position after the peripheral collapse of the storage tank foundation, A2' = second corner position after the peripheral collapse of the storage tank foundation, A3' = third corner position after the peripheral collapse of the storage tank foundation, A4' = fourth corner position after the peripheral collapse of the storage tank foundation, O - center of the lower surface of the support platform, X - X axis, Z - Z axis. Specific implementation method

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The displacement control device of the present invention includes: a displacement control mechanism assembly 1, a molten salt storage tank 2, and a storage tank foundation 3. As Figure 1 and Figure 2 shown, a plurality of stress sensors 21 are installed on the side wall and the bottom of the molten salt storage tank 2; the molten salt storage tank 2 is placed on the upper surface of the storage tank foundation 3, and the storage tank foundation 3 has a composite material structure for bearing and insulating the molten salt storage tank 2 and is placed on the upper surface of the displacement control mechanism assembly 1.

[0025] As Figure 3 shown, the displacement control mechanism assembly 1 includes: a support platform 11, a central displacement adjustment sub-mechanism 12, four groups of outer edge displacement adjustment sub-mechanisms 13, four groups of groove rails 14, four groups of convex rails 15, a rail connection assembly 16, and a plurality of inclination sensors 17. Among them, the support platform 11 is jointly supported by the central displacement adjustment sub-mechanism 12 and the four groups of outer edge displacement adjustment sub-mechanisms 13 in a five-point distribution arrangement. The four groups of outer edge displacement adjustment sub-mechanisms 13 are respectively connected to the groove rails 14 at the corresponding positions. The four groups of groove rails 14 and the four groups of convex rails 15 are respectively connected in an embedded manner, and the rail connection assembly 16 fixes the four groups of convex rails 15 together to form a stable support structure. A plurality of inclination sensors 17 are arranged at the edge positions on the upper surface of the support platform 11.

[0026] As Figure 4 shown, a central spherical groove is provided at the center O of the lower surface of the support platform 11, and an edge spherical groove is provided at each of the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 on the lower surface of the support platform 11. The central spherical groove and the four edge spherical grooves are respectively connected with the upper parts of the central spherical head rod 121 and the edge spherical head rod 131 in a spherical mating manner. One or more inclination sensors 17 are installed on the upper surface of the support platform 11 to measure the inclination displacement of the support platform 11.

[0027] As Figure 5 shown, the central displacement adjustment sub-mechanism 12 includes: a central spherical head rod 121, a central bearing 122, a central long nut 123, a central screw 124, and a central base 125. The central spherical head rod 121, the central long nut 123, the central screw 124, and the central base 125 are connected in sequence from top to bottom.

[0028] Among them, the central ball-headed rod 121 is installed at the bottom of the support platform 11 through the cooperation of the ball head at its upper end and the central spherical surface groove on the lower surface of the support platform, realizing the connection between the central ball-headed rod 121 and the support platform 11. The ball head of the central ball-headed rod 121 has rotational freedom in any direction within the central spherical surface groove, but no translational freedom. The central ball-headed rod 121 is tightly fitted with the inner hole of the central bearing 122 through the outer cylindrical surface of its lower rod, realizing the connection between the central ball-headed rod 121 and the central long nut 123. The central bearing 122 is located at the top of the central long nut 123. The upper part of the inner hole of the central long nut 123 is a smooth through hole, and it is tightly fitted and connected with the central ball-headed rod 121 through the interference fit with the outer diameter of the central bearing 122 and can rotate around the central ball-headed rod 121. When the central long nut 123 rotates, it will generate an upward or downward force. Therefore, the central bearing 122 is selected as a double-row tapered roller bearing or other bearings that can bear bidirectional forces. The lower part of the inner hole of the central long nut 123 is a threaded hole, and the lower part of the central long nut 123 is threadedly connected with the upper part of the central screw 124 through the threaded hole. When the central long nut 123 rotates, it can rise or fall along the height direction of the central screw 124 at the same time. The bottom of the central screw 124 is fixedly connected to the central base 125.

[0029] As Figure 6 shown, the outer edge displacement adjustment sub-mechanism 13 includes: an edge ball-headed rod 131, an edge bearing 132, an edge long nut 133, an edge screw 134, and an edge slider 135. The edge ball-headed rod 131, the edge long nut 133, the edge screw 134, the edge slider 135, the groove guide rail 14, and the convex guide rail 15 are connected in sequence from top to bottom.

[0030] Among them, the four edge ball-headed rods 131 are respectively installed at the bottoms of the four corners of the support platform 11 through the cooperation of the ball heads at their upper ends and the four edge spherical surface grooves on the lower surface of the support platform, realizing the connection between the edge ball-headed rods 131 and the support platform 11. Each ball head has rotational freedom in any direction within the edge spherical surface groove, but no translational freedom. The edge ball-headed rod 131 is tightly fitted with the inner hole of the edge bearing 132 through the outer cylindrical surface at the lower part of the rod, realizing the connection between the edge ball-headed rod 131 and the edge long nut 133. The edge bearing 132 is located at the top of the edge long nut 133. The upper part of the inner hole of the edge long nut 133 is a smooth through hole, and it is tightly fitted and connected with the edge ball-headed rod 131 through the interference fit with the outer diameter of the edge bearing 132 and can rotate around the edge ball-headed rod 131. During the rotation of the edge long nut 133, an upward or downward force will be generated. Therefore, the edge bearing 132 is selected as a double-row tapered roller bearing or other bearings that can withstand bidirectional forces. The lower part of the inner hole of the edge long nut 133 is a threaded hole, and the lower part of the edge long nut 133 is threadedly connected with the upper part of the edge screw rod 134 through the threaded hole. When the edge long nut 133 rotates, it can rise or fall along the height direction of the edge screw rod 134 at the same time. The bottom of the edge rod 134 is fixedly connected with the edge slider 135. The groove guide 14 is provided with an upper groove 141 and a lower groove 142. The edge slider 135 is slidably connected with the upper groove 141, and the convex guide 15 is slidably connected with the lower groove 142.

[0031] As Figure 7 shown, the edge slider 135 can translate along the X direction within the upper groove 141, constituting the sliding connection between the outer edge displacement adjustment sub-mechanism 13 and the groove guide 14. The groove guide 14 also constitutes a sliding connection with the convex guide 15 through the lower groove 142 to realize the translation in the Y direction.

[0032] Figure 8 shown, the guide connection assembly 16 includes: a cross-shaped member 161 and a frame-shaped member 162. At the central part O, the cross-shaped member 161 is fixedly connected with the central displacement adjustment sub-mechanism 12 through the central base 125; at the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4, each convex guide 15 is fixedly connected with the frame-shaped member 162.

[0033] The displacement control device provided by the present invention can realize the control of the angular displacement and the central concave displacement of the storage tank foundation 3 relative to the XY plane, so as to study the variation law of the mechanical properties of the molten salt storage tank 2 caused by the displacement of the storage tank foundation 3, and provide technical support for the mechanical research and structural design optimization of the molten salt storage tank 2. The displacement control method of the present invention is as follows:

[0034] As Figure 9As shown in the figure, when the displacement control device simulates the angular displacement of the storage tank foundation, the edge long nuts 133 located at the first corner position A1 and the third corner position A3 are respectively rotated to raise the first corner position A1 and the third corner position A3 of the support platform 11 to the same height. At the same time, the edge long nuts 133 located at the second corner position A2 and the fourth corner position A4 are rotated to lower the second corner position A2 and the fourth corner position A4 of the support platform 11 to the same height, that is, the coordinate axes OX and OZ are respectively rotated to OX' and OZ'.

[0035] Since the support platform 11 is a rigid structure and there is no translational freedom in the ball joint connection mode with the outer edge displacement adjustment sub-mechanism 13, the distances from the center O of the lower surface of the support platform to the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 will not change due to the generation of the angular displacement of the support platform 11; however, the edge sliders 135 of the outer edge displacement adjustment sub-mechanism 13 will undergo corresponding displacements. This displacement is decomposed into an X-direction displacement and a Y-direction displacement (the Y-direction is as Figure 8 shown), the X-direction displacement is realized by the translational sliding of the edge slider 135 in the upper groove 141 of the groove guide 14, and the Y-direction displacement is realized by the translational sliding of the lower groove 142 of the groove guide 14 on the convex guide 15. One or more tilt sensors 17 on the upper surface of the support platform 11 are used to measure the angular displacement of the support platform 11. With the occurrence of this angular displacement, the molten salt storage tank 2 and the storage tank foundation 3 placed above the support platform 11 undergo corresponding mechanical changes, and the stress sensors 21 installed at various parts of the molten salt storage tank 2 can measure the mechanical changes of the molten salt storage tank 2. The stress sensors 21 can select the installation directions of axial (along the OZ direction), circumferential (rotating around the OZ direction), and radial (along the OX direction) according to the stress state at the measuring points, so as to measure the stresses of the molten salt storage tank 2 in the axial, circumferential, and radial directions, and realize the study of the variation law of the mechanical properties of the molten salt storage tank caused by the angular displacement condition of the storage tank foundation.

[0036] The support platform 11 can be made to form an upward concave surface type by rotating the central long nut 123 down to a certain height while keeping the four edge long nuts 133 stationary, or by keeping the central long nut 123 stationary and raising the four edge long nuts 133 to a certain height, so as to realize that the displacement control device simulates the upward concave surface type displacement of the storage tank foundation 3; or, the support platform 11 can be made to form a downward concave surface type by rotating the central long nut 123 up to a certain height while keeping the four edge long nuts 133 stationary, or by keeping the central long nut 123 stationary and lowering the four edge long nuts 133 to a certain height, so as to realize that the displacement control device simulates the downward concave surface type displacement of the storage tank foundation 3.

[0037] The following takes Figure 10 、 Figure 11Two specific displacement regulation methods are introduced by way of example.

[0038] As Figure 10 shown, when the displacement regulation device simulates the central collapse of the storage tank foundation, the central long nut 123 rotates and descends to a certain height, and the four edge long nuts 133 remain stationary, causing the center O of the lower surface of the support platform 11 to move downward to O', and a concave surface is formed on the surface of the support platform 11. The concave surface can also be achieved by rotating the four edge long nuts 133 to raise the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 of the support platform 11 by the same height and keeping the position of the central long nut 123 unchanged.

[0039] As Figure 11 shown, when the displacement regulation device simulates the peripheral collapse of the storage tank foundation, the position of the central long nut 123 is kept unchanged, and the four edge long nuts 133 are rotated to lower the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 of the support platform 11 by the same height, that is, they are respectively lowered to positions A1', A2', A3', and A4', and a concave surface is formed on the surface of the support platform 11. The concave surface can also be achieved by rotating the central long nut 123 to raise the center O of the lower surface of the support platform 11 by a certain height and keeping the positions of the four edge long nuts 133 unchanged.

[0040] Since the support platform 11 is a rigid structure and there is no translational freedom in the ball joint connection mode with the outer edge displacement adjustment sub-mechanism 13, when the support platform 11 generates a concave deformation (forming a concave surface or a convex surface), the distances from the center O of the lower surface of the support platform to the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 will not change. Therefore, the edge sliders 135 at the bottom of the outer edge displacement adjustment sub-mechanism 13 will undergo corresponding displacements, and this displacement is decomposed into an X-direction displacement and a Y-direction displacement (the Y-direction is as Figure 8 shown). The X-direction displacement is achieved by the translational sliding of the edge slider 135 in the upper groove 141 of the groove guide 14, and the Y-direction displacement is achieved by the translational sliding of the lower groove 142 of the groove guide 14 on the convex guide 15. The height change of the center O of the lower surface of the support platform relative to the first corner position A1, the second corner position A2, the third corner position A3, and the fourth corner position A4 can be measured with a ruler, or can be indirectly obtained by measuring the inclination angle of the edge of the support platform 11 with an inclination sensor 17. The stress changes in the molten salt storage tank 2 caused by the concave surface deformation displacement of the upper concave surface type and the lower concave surface type are measured by a stress sensor 21 to realize the research on the variation law of the mechanical properties of the molten salt storage tank under the condition of the concave surface deformation displacement of the storage tank foundation.

Claims

1. A displacement control device, characterized in that: include: A displacement control mechanism assembly (1), a molten salt storage tank (2) and a storage tank foundation (3); the molten salt storage tank (2) is placed on the upper surface of the storage tank foundation (3), and the storage tank foundation (3) is placed on the upper surface of the displacement control mechanism assembly (1); The displacement control mechanism assembly (1) comprises a support platform (11), a central displacement control sub-mechanism (12), four groups of outer edge displacement control sub-mechanisms (13), four groups of grooved guide rails (14), four groups of convex guide rails (15), and a guide rail connection assembly (16); the support platform (11) is supported by the central displacement control sub-mechanism (12) and the four groups of outer edge displacement control sub-mechanisms (13) in a five-point distribution arrangement; the four groups of outer edge displacement control sub-mechanisms (13) are respectively connected to the grooved guide rails (14) at corresponding positions; the four groups of grooved guide rails (14) are respectively connected to the four groups of convex guide rails (15) in a chimeric manner; and the guide rail connection assembly (16) securely connects the four groups of convex guide rails (15).

2. The displacement control device according to claim 1, characterized in that: The displacement control mechanism assembly (1) further comprises a plurality of inclination sensors (17) arranged on the upper surface of the support platform (11).

3. The displacement control device according to claim 1, characterized in that: The displacement control device further comprises: a plurality of stress sensors (21) arranged on the side wall and the bottom of the molten salt storage tank (2).

4. The displacement control device according to claim 1, characterized in that: A central spherical groove is provided at the center O of the lower surface of the support platform (11), and an edge spherical groove is provided at a first corner position (A1), a second corner position (A2), a third corner position (A3) and a fourth corner position (A4) of the lower surface of the support platform (11).

5. The displacement control device according to claim 1, characterized in that: The center displacement adjustment sub-mechanism (12) comprises: a center ball head rod (121), a center bearing (122), a center long nut (123), a center screw (124) and a center base (125); the center ball head rod (121), the center long nut (123), the center screw (124) and the center base (125) are connected in sequence from top to bottom; and the center bearing (122) is arranged on the top of the center long nut (123).

6. The displacement control device according to claim 5, characterized in that: The central ball head rod (121) is installed at the bottom of the support platform through the cooperation of the ball head at its upper end with the central spherical groove on the lower surface of the support platform (11), so as to realize the connection between the central ball head rod (121) and the support platform (11); the central ball head rod (121) is tightly matched with the inner hole of the central bearing (122) through the outer cylindrical surface of the lower end rod of the central ball head rod (121), so as to realize the connection between the central ball head rod (121) and the central long nut (123); the upper part of the inner hole of the central long nut (123) is a smooth through hole, which is connected with the central bearing The interference fit of the outer diameter of (122) realizes a tight fit connection with the center ball head rod (121), and can rotate around the center ball head rod (121); the lower part of the inner hole of the center long nut (123) is a threaded hole, and the lower part of the center long nut (123) and the upper part of the center screw (124) are threadedly connected through the threaded hole. When the center long nut (123) rotates, it can simultaneously rise or fall along the height direction of the center screw (124); the bottom of the center screw (124) is fixedly connected to the center base (125).

7. The displacement control device according to claim 5, characterized in that: The outer edge displacement adjustment sub-mechanism (13) comprises: an edge ball head rod (131), an edge bearing (132), an edge long nut (133), an edge screw rod (134), and an edge slider (135); the edge ball head rod (131), the edge long nut (133), the edge screw rod (134), the edge slider (135), the groove guide rail (14), and the convex guide rail (15) are connected in sequence from top to bottom; and the edge bearing (132) is arranged on the top of the edge long nut (133).

8. The displacement control device according to claim 7, characterized in that: The four edge ball head rods (131) are respectively installed at the bottom of the four corners of the support platform through the cooperation of the ball heads at the upper ends thereof with the four edge spherical grooves on the lower surface of the support platform (11), so as to realize the connection between the edge ball head rods (131) and the support platform (11); the edge ball head rods (131) are tightly cooperated with the inner hole of the edge bearing (132) through the outer cylindrical surface at the lower part of the rod, so as to realize the connection between the edge ball head rods (131) and the edge long nut (133); the upper part of the inner hole of the edge long nut (133) is a smooth through hole, through which the edge ball head rods (131) are connected. The edge ball head rod (131) is tightly connected with the edge ball head rod (131) through an interference fit with the outer diameter of the edge bearing (132), and can rotate around the edge ball head rod (131); the lower part of the inner hole of the edge long nut (133) is a threaded hole, and the lower part of the edge long nut (133) and the upper part of the edge screw rod (134) are threadedly connected through the threaded hole. When the edge long nut (133) rotates, it can simultaneously rise or fall along the height direction of the edge screw rod (134); the bottom of the edge rod (134) is fixedly connected to the edge slider (135).

9. The displacement control device according to claim 8, characterized in that: The groove guide rail (14) is provided with an upper groove (141) and a lower groove (142); the edge slider (135) is slidably connected to the upper groove (141); and the convex guide rail (15) is slidably connected to the lower groove (142); the edge slider (135) can translate in the upper groove (141) along the X direction, forming a sliding connection between the outer edge displacement adjustment sub-mechanism (13) and the groove guide rail (14); the groove guide rail (14) also forms a sliding connection with the convex guide rail (15) through the lower groove (142), thereby realizing translation in the Y direction.

10. The displacement control device according to claim 8, characterized in that: The guide rail connection assembly (16) comprises a cross-shaped component (161) and a frame-shaped component (162); at the center O of the lower surface of the support platform (11), the cross-shaped component (161) is fixedly connected to the central displacement adjustment sub-mechanism (12) via a central base (125); at a first corner position (A1), a second corner position (A2), a third corner position (A3), and a fourth corner position (A4) of the lower surface of the support platform (11), each convex guide rail (15) is fixedly connected to the frame-shaped component (162).

11. A displacement control method, used in the displacement control device according to any one of claims 7 to 10, characterized in that: include: The edge long nuts (133) located at the first corner position (A1) and the third corner position (A3) are rotated respectively, so that the first corner position (A1) and the third corner position (A3) of the support platform (11) are raised to the same height, and the edge long nuts (133) located at the second corner position (A2) and the fourth corner position (A4) are rotated at the same time, so that the second corner position (A2) and the fourth corner position (A4) of the support platform (11) are lowered to the same height, so that the coordinate axes OX and OZ are rotated to OX' and OZ' respectively, so that the displacement control device simulates the inclination displacement of the storage tank foundation (3).

12. A displacement control method, used in the displacement control device according to any one of claims 7 to 10, characterized in that: include: The central long nut (123) is rotated and lowered to a certain height, while the four edge long nuts (133) remain stationary; or, the central long nut (123) remains stationary and the four edge long nuts (133) are raised to a certain height, so that the surface of the support platform (11) forms an upper concave shape, thereby enabling the displacement control device to simulate the upper concave displacement of the storage tank foundation (3); or, the central long nut (123) is rotated and raised to a certain height, while the four edge long nuts (133) remain stationary; or, the central long nut (123) remains stationary and the four edge long nuts (133) are lowered to a certain height, so that the surface of the support platform (11) forms a lower concave shape, thereby enabling the displacement control device to simulate the storage tank foundation (3) to undergo a lower concave displacement, thereby enabling the displacement control device to simulate the central collapse and surrounding collapse of the storage tank foundation.

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