Perlite lateral pressure testing device

Abstract

The invention discloses a perlite side pressure test device, which comprises a test box, a sliding plate and a loading mechanism, and is characterized in that the test box comprises a base, a fixed rear plate, a fixed top plate and two fixed side plates, the fixed rear plate and the fixed side plates are fixedly installed on the base, and the two fixed side plates are located on the left and right sides of the fixed rear plate; the fixed top plate is fixedly installed on the fixed side plates and the fixed rear plate so that a test chamber can be defined in the test box, the sliding plate is vertically arranged, the sliding plate can be transversely and movably arranged in the test chamber, and a plurality of pressure sensors which are sequentially arranged at intervals in the vertical direction are installed on the sliding plate; an elastic felt is fixed on one side, facing the fixed rear plate, of the sliding plate, expanded perlite is filled between the elastic felt and the fixed rear plate, the loading mechanism comprises a counter-force frame and a servo actuator, the counter-force frame is transversely arranged between the two fixed side plates in a crossing mode and is installed on the fixed side plates, the servo actuator is installed on the counter-force frame, and the servo actuator is installed on the counter-force frame. And the servo actuator is fixedly connected with the sliding plate.

Description

Technical Field

[0001] The invention relates to the technical field of liquefied natural gas storage, and in particular to a perlite side pressure testing device. Background Art

[0002] LNG refers to liquefied natural gas, and its demand is increasing day by day. LNG storage is a very important link in the LNG industry. At present, the most commonly used and relatively mature storage technology in China is the full-containment prestressed concrete storage tank.

[0003] LNG storage tanks have strict insulation measures, including cold insulation at the bottom, wall and top of the tank. Expanded perlite is used as a key insulation material and is filled in the annular space of the tank. The annular space is located between the prestressed reinforced concrete outer tank and the 9% Ni steel plate of the inner tank. A layer of elastic felt is laid on the outer side of the inner tank wall, and the rest of the inner wall insulation layer is filled with expanded perlite. Expanded perlite and elastic felt are the main insulation materials between the inner tank wall and the outer tank wall of the LNG full-capacity storage tank, which have an important impact on the overall structural stress of the tank.

[0004] At present, the lateral pressure of expanded perlite in the annular gap of storage tanks is in the theoretical calculation stage, and there is a lack of means to verify the rationality of the theoretical calculation, which is in urgent need of improvement. Summary of the invention

[0005] The present application provides a perlite side pressure testing device, which solves the technical problem in the prior art of verifying the rationality of theoretical calculation of perlite side pressure of storage tank annulus expansion.

[0006] The present application provides a perlite side pressure testing device, including a test box, a sliding plate and a loading mechanism, the test box including a base, a fixed rear plate, a fixed top plate and two fixed side plates, the fixed rear plate and the fixed side plates are both fixedly mounted on the base, the two fixed side plates are located on the left and right sides of the fixed rear plate, the fixed top plate is fixedly mounted on the fixed side plates and the fixed rear plate to enclose a test chamber in the test box, the sliding plate is arranged vertically, the sliding plate can be laterally movably arranged in the test chamber, the sliding plate is equipped with a plurality of pressure sensors arranged vertically in sequence, an elastic felt is fixed on a side of the sliding plate facing the fixed rear plate, and expanded perlite is filled between the elastic felt and the fixed rear plate, the loading mechanism includes a reaction frame and a servo actuator, the reaction frame is laterally spanned between the two fixed side plates, the reaction frame is mounted on a side of the fixed side plate away from the fixed rear plate, the servo actuator is mounted on the reaction frame, and the servo actuator is fixedly connected to the sliding plate to adjust the position of the sliding plate in the test chamber.

[0007] In some embodiments, the perlite side pressure testing device also includes multiple groups of gap adjustment assemblies, which are arranged in sequence at intervals in the height direction; the gap adjustment assemblies include a gap adjustment rod, two threaded rods, two nuts and two L-shaped fixings, and threaded holes along the length direction are respectively opened at both ends of the gap adjustment rod, and the two threaded rods are respectively threadedly connected to the two ends of the gap adjustment rod through the threaded holes, and the two nuts are respectively threadedly installed on the threaded rod, the nuts are located outside the gap adjustment rod, and the L-shaped fixings are welded to the nuts.

[0008] In some embodiments, the fixed side plate is made of steel.

[0009] In some embodiments, a plurality of shock absorbers are mounted on the bottom of the base.

[0010] In some embodiments, the loading mechanism includes at least two reaction frames, the at least two reaction frames are arranged at intervals in height, and each reaction frame is installed with at least two servo actuators.

[0011] In some embodiments, the servo actuator is equipped with a displacement sensor and a force sensor to achieve closed-loop control.

[0012] In some embodiments, a feed port is provided on the fixed top plate, and a discharge port is provided on the fixed rear plate, and the discharge port is provided with a butterfly valve for adjustment.

[0013] In some embodiments, a manhole door is opened on the fixed rear plate, and the manhole door is closed and fixed with screws during the test.

[0014] In some embodiments, an extension pad is configured at the rear ball joint of each servo actuator to adjust the filling space range of the expanded perlite.

[0015] In some embodiments, the load of the shock absorber is not less than 640 kN, or each shock absorber is fixed to the foundation.

[0016] The beneficial effects of the present application are as follows: a perlite side pressure test device is provided. When in use, the elastic felt is first fixed, then the expanded perlite is filled, and then the perlite is vibrated and compacted until the data measured by the pressure sensor is stable within a certain degree; by controlling the servo actuator to reciprocate at a certain frequency, the position of the sliding plate in the test chamber is adjusted, so that different side pressures are applied to the expanded perlite, and the perlite side pressure test is smoothly carried out, including a simulated tank contraction test and a simulated tank expansion test;

[0017] The test device of the present application improves the safety and controllability of the test and the accuracy of stress data monitoring; compared with actual field tests, the test device has low construction cost, can be used for multiple and repeated tests, and has a short installation and construction period; the test results, i.e., the pressure values ​​at each measuring point, generally show a trend that the upper pressure is relatively small and the lower pressure is relatively large. By using the test device to conduct experiments, the reliability of the theoretical calculation of the perlite side pressure is verified, and it also provides original data with reference significance for finite element numerical simulation, and provides theoretical and data support for the subsequent overall modeling of LNG storage tanks and the study of the overall perlite side pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0019] Figure 1 A rear view of a perlite side pressure test device provided in this application;

[0020] Figure 2 A front view of a perlite side pressure test device provided in this application;

[0021] Figure 3 A top view of a perlite side pressure test device provided in this application;

[0022] Figure 4 A bottom view of a perlite side pressure test device provided in this application;

[0023] Figure 5 A cross-sectional view of a perlite side pressure test device provided for this application;

[0024] Figure 6 This is a schematic diagram of the specific structure of the gap adjustment rod in the device provided in this application.

[0025] Figure markings: 1- shock absorber, 2- base, 3- discharge port, 4- butterfly valve, 5- manhole door, 6- pressure sensor, 7- L-type fixing, 71- nut, 8- gap adjustment rod, 81- threaded rod, 9- fixed rear plate, 10- fixed side plate, 11- sliding plate, 12- fixed top plate, 13- feed port, 14- elastic felt, 15- expanded perlite, 16- reaction frame, 17- extension pad, 18- servo actuator. DETAILED DESCRIPTION

[0026] This application provides a perlite side pressure test device, please refer to Figures 1 to 4 , showing the rear view, front view, top view and bottom view of the device in turn, Figure 5 Shown Figure 1 and Figure 2 Cross-sectional view at 1-1 in the figure.

[0027] Please refer to Figure 1 , Figure 2 and Figure 5 The device includes a test box, which is designed as a box-type structure, a base 2, a fixed rear plate 9, a fixed top plate 12 and two fixed side plates 10. The base 2 is arranged on the bottom side, the fixed rear plate 9 is arranged on the rear side, the fixed top plate 12 is arranged on the top side, and the two fixed side plates 10 are arranged on the left and right sides, and the front side is open. In detail, the fixed rear plate 9 and the fixed side plates 10 are both fixedly installed on the base 2, the two fixed side plates 10 are located on the left and right sides of the fixed rear plate 9, and the fixed top plate 12 is fixedly installed on the fixed side plates 10 and the fixed rear plate 9 to enclose a test chamber in the test box. The front side of the test chamber is open, or in other words, a movable sliding plate 11 is arranged on the front side of the test chamber.

[0028] Please refer to Figures 2 to 5 The device includes a sliding plate 11, which is arranged vertically. The sliding plate 11 is arranged as a vertical plate and is movably arranged at the front side of the test chamber, and the moving direction is horizontal. Figure 2 As shown, a plurality of pressure sensors 6 are installed on the sliding plate 11, and the plurality of pressure sensors 6 are arranged in sequence in the vertical direction. Figure 2 An arrangement of eight pressure sensors 6 is shown in FIG. Figure 5 An elastic felt 14 is fixed on one side of the sliding plate 11 facing the fixed rear plate 9 , and expanded perlite 15 is filled between the elastic felt 14 and the fixed rear plate 9 .

[0029] Please refer to Figures 2 to 5 The device includes a loading mechanism, which includes a reaction frame 16 and a servo actuator 18. The reaction frame 16 is laterally spanned between two fixed side plates 10. The reaction frame 16 is installed on a side of the fixed side plate 10 away from the fixed rear plate 9. The servo actuator 18 is installed on the reaction frame 16. The servo actuator 18 is fixedly connected to the sliding plate 11 to adjust the position of the sliding plate 11 in the test chamber.

[0030] When in use, first fix the elastic felt 14, and fix the elastic felt 14 on the sliding plate 11 in a hanging manner, forming an annular gap space between the elastic felt 14 and the fixed rear plate 9, the top side of the annular gap space is the fixed top plate 12, the bottom side is the base 2, and the left and right are two fixed side plates 10.

[0031] After the elastic felt 14 is fixed, the pressure values ​​of the 8 measuring points are recorded by the pressure sensor 6. Then the expanded perlite 15 is filled in the annular space. After the initial filling, the pressure values ​​of the 8 measuring points and the weight of the filler need to be recorded. Then, the pressure values ​​of the 8 measuring points are recorded after vibrating and compacting for 5 minutes. After that, the pressure values ​​of the 8 measuring points are recorded every 5 minutes, at least three times, until the pressure difference between the two recorded pressure values ​​does not exceed 0.1N, which means that the data measured by the pressure sensor 6 is stable to a certain extent.

[0032] After the pressure difference stabilizes, start the simulated tank contraction test. The test stroke is in accordance with the regulations of each working condition. Let it stand and record the data. Then start the simulated tank expansion test. The test stroke is in accordance with the regulations of each working condition. Let it stand and record the data. Analyze the data and start the next cycle.

[0033] When the device is tested, the servo actuator 18 is controlled to reciprocate at a certain frequency to adjust the position of the sliding plate 11 in the test chamber, thereby applying different side pressures to the expanded perlite 15, and the perlite side pressure test is smoothly carried out, including a simulated tank contraction test and a simulated tank expansion test.

[0034] This device improves the safety and controllability of the test and the accuracy of stress data monitoring. Compared with actual field tests, this test device has the advantages of low cost, and the device can be used for multiple and repeated tests, with a short installation and construction period.

[0035] The test results of this device, i.e. the pressure values ​​at each measuring point, generally show a trend that the upper pressure is relatively small and the lower pressure is relatively large. By using this test device to conduct experiments, the reliability of the theoretical calculation of the perlite side pressure is verified, and it also provides reference-worthy original data for finite element numerical simulation, and provides theoretical and data support for the subsequent overall modeling of LNG storage tanks and the study of the overall perlite side pressure.

[0036] Considering that the two fixed side plates 10 may receive an outward extrusion force during the test, in some embodiments, a gap adjustment rod 8 is used to maintain the stability of the spacing distance between the two fixed side plates 10. In detail, the perlite side pressure test device also includes a plurality of gap adjustment components, and the gap adjustment components include a gap adjustment rod 8, such as Figure 2 As shown, multiple groups of gap adjustment components are arranged in sequence and spaced apart in the height direction.

[0037] Please refer to Figure 2 , Figure 5 and Figure 6 The gap adjustment assembly includes a gap adjustment rod 8, two threaded rods 81, two nuts 71 and two L-shaped fixings 7. The gap adjustment rod 8 has two ends, and each end is respectively provided with a threaded rod 81, a nut 71 and an L-shaped fixing 7. For details, please refer to Figure 6The gap adjusting rod 8 has threaded holes at both ends of the length, and the threaded holes are arranged along the length direction. The threaded rod 81 is threadedly connected with the gap adjusting rod 8 through the threaded holes, and the nut 71 is threadedly installed on the threaded rod 81, and the nut 71 is located outside the gap adjusting rod 8. The L-shaped fixing member 7 is welded to the nut 71, and the nut 71 is rotated by rotating the L-shaped fixing member 7, so that the threaded rod 81 is adjusted to extend or retract compared with the gap adjusting rod 8, so as to adjust the overall length of the gap adjusting rod 8 and the threaded rod 81.

[0038] By arranging the gap adjusting rod 8, the threaded rods 81 at both ends of the gap adjusting rod 8 are pressed against the inner side of the fixed side plate 10, so as to maintain the spacing of the fixed side plate 10 at that location unchanged, ensure the smooth movement of the sliding plate 11, ensure that the fixed side plate 10 does not block the sliding plate 11, and maintain the seal between the fixed side plate 10 and the sliding plate 11.

[0039] In the present device, the fixed side plate 10 can be made of steel.

[0040] In some embodiments, see Figure 1 and Figure 4 , multiple shock absorbers 1 are installed at the bottom of the base 2. The load of each shock absorber 1 on the bottom of the equipment is not less than 640kN, or each shock absorber 1 is fixed to the foundation.

[0041] In some embodiments, see Figure 4 and Figure 5 An extension pad 17 is arranged at the rear ball joint of each servo actuator 18 to adjust the annular gap space and the filling space range of the expanded perlite 15.

[0042] In some embodiments, the loading mechanism includes at least two reaction frames 16, Figure 2 The scheme of two reaction frames 16 is shown in FIG. Figure 2 At least two reaction frames 16 are arranged at intervals in height, and each reaction frame 16 is equipped with at least two servo actuators 18. Figure 2 The solution of installing two servo actuators 18 on each reaction frame 16 is shown in FIG.

[0043] In some embodiments, the servo actuator 18 is equipped with a displacement sensor and a force sensor, which are mounted on the servo actuator 18 to achieve closed-loop control. The servo actuator 18 is connected to the sliding plate 11 by bolts, and the function of changing the annular gap spacing is achieved by controlling the actuator to reciprocate at a certain frequency.

[0044] In some embodiments, see Figure 3 , open a feed port 13 on the fixed top plate 12, please refer to Figure 4 A discharge port 3 is provided on the fixed rear plate 9, and the discharge port 3 is equipped with a butterfly valve 4 for adjustment.

[0045] In some embodiments, see Figure 1 A manhole door 5 is provided on the fixed rear plate 9, and the manhole door 5 is close to the bottom side of the fixed rear plate 9. During the test, the manhole door 5 is in a closed state and is fixed with screws all around.

[0046] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A perlite side pressure test device, characterized in that: include: A test box, the test box comprising a base, a fixed rear plate, a fixed top plate and two fixed side plates, the fixed rear plate and the fixed side plates are both fixedly mounted on the base, the two fixed side plates are located on the left and right sides of the fixed rear plate, and the fixed top plate is fixedly mounted on the fixed side plates and the fixed rear plate to enclose the test box to form a test chamber; A sliding plate, the sliding plate is arranged in a vertical direction, the sliding plate is disposed in the test chamber in a transversely movable manner, the sliding plate is provided with a plurality of pressure sensors arranged in sequence and spaced in a vertical direction, an elastic felt is fixed on a side of the sliding plate facing the fixed rear plate, and expanded perlite is filled between the elastic felt and the fixed rear plate; The loading mechanism comprises a reaction frame and a servo actuator, wherein the reaction frame is laterally arranged between the two fixed side plates, the reaction frame is installed on a side of the fixed side plate away from the fixed rear plate, the servo actuator is installed on the reaction frame, and the servo actuator is fixedly connected to the sliding plate to adjust the position of the sliding plate in the test chamber.

2. The pearlite side pressure test device according to claim 1, characterized in that: The perlite side pressure test device also includes a plurality of groups of gap adjustment components, and the plurality of groups of gap adjustment components are sequentially spaced apart in the height direction; The gap adjustment assembly includes a gap adjustment rod, two threaded rods, two nuts and two L-shaped fixings. Threaded holes along the length direction are respectively opened at both ends of the gap adjustment rod. The two threaded rods are respectively threadedly connected to the two ends of the gap adjustment rod through the threaded holes. Two nuts are respectively threadedly installed on the threaded rod. The nuts are located outside the gap adjustment rod, and the L-shaped fixings are welded to the nuts.

3. The pearlite side pressure test device according to claim 2, characterized in that: The fixed side plate is made of steel.

4. The pearlite side pressure test device according to claim 1, characterized in that: A plurality of shock absorbers are installed at the bottom of the base.

5. The pearlite side pressure test device according to claim 1, characterized in that: The loading mechanism comprises at least two reaction frames, which are arranged at intervals in height, and each reaction frame is equipped with at least two servo actuators.

6. The pearlite side pressure test device according to claim 1, characterized in that: The servo actuator is equipped with a displacement sensor and a force sensor to achieve closed-loop control.

7. The pearlite side pressure test device according to claim 1, characterized in that: A feed inlet is provided on the fixed top plate, and a discharge outlet is provided on the fixed rear plate. The discharge outlet is provided with a butterfly valve for adjustment.

8. The pearlite side pressure testing device according to claim 1, characterized in that: A manhole door is provided on the fixed rear plate, and the manhole door is closed and fixed with screws during the test.

9. The perlite side pressure test device according to claim 1, 5 or 6, characterized in that: An extension pad is arranged at the rear ball joint of each servo actuator to adjust the filling space range of the expanded perlite.

10. The pearlite side pressure test device according to claim 4, characterized in that: The load of the shock absorber is not less than 640 kN, or each shock absorber is fixed to the foundation.

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