A reinforced hollow structure test piece sample preparation device

Abstract

The utility model relates to the technical field of test piece preparation, and specifically discloses a reinforced hollow structure test piece sampling device. The reinforced hollow structure test piece sampling device comprises a pedestal, a stand, an inflatable inner mold and an outer mold, the inflatable inner mold is arranged on the pedestal, and the inflatable inner mold is connected with an inflation equipment. The outer mold comprises a first opening and closing mold and a second opening and closing mold, at least one of the first opening and closing mold and the second opening and closing mold is rotationally connected to the stand, and the first opening and closing mold is rotationally closed on the second opening and closing mold. The inner wall surface of the outer mold and the outer wall surface of the inflatable inner mold form a test piece forming area, and the inner wall surface of the outer mold and the outer surface of the inflatable inner mold are both arranged with a diaphragm layer. By using the utility model, the inflatable inner mold can be recycled, the operation steps of replacing the inflatable inner mold during test piece preparation are reduced, and the sampling efficiency of the hollow structure test piece is effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of specimen preparation technology, and in particular to a sample preparation device for reinforced hollow structural specimens. Background Technology

[0002] Composite structures formed by combining materials such as concrete, steel, and FRP can be widely used in engineering projects such as bridge piers, arch ribs, industrial pipelines, and wind turbine towers. The stress performance of composite structures can be studied by molding small-scale structural specimens. Common small-scale structural specimens include circular or square steel-concrete composite structural specimens. These specimens can be further classified according to their structure into solid structural specimens (those with internal steel sections) and hollow structural specimens (those without internal steel sections). However, for hollow structural specimens, especially those with a high void ratio (thin walls) or those with reinforcing cages, the molding efficiency and quality are difficult to guarantee.

[0003] Unlike the centrifugal process used in engineering to form hollow thin-walled specimens, it is difficult to provide mature small-scale centrifuge equipment and corresponding operating conditions in the laboratory. Although PVC pipes and foam core molds can be used as inner molds, PVC pipes and foam core molds are difficult to reuse, and the inner molds need to be replaced repeatedly when preparing specimens, which reduces the efficiency of specimen production. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a sample preparation device for reinforced hollow structural specimens, which enables the recycling of the inflatable inner mold, reduces the number of steps required to replace the inflatable inner mold during specimen preparation, and effectively ensures the sample preparation efficiency of hollow structural specimens.

[0005] To solve the above-mentioned technical problems, this utility model provides a sample preparation device for reinforced hollow structure specimens, including a base, a column, an inflatable inner mold and an outer mold, wherein the inflatable inner mold is disposed on the base and is connected to an inflation device;

[0006] The outer mold includes a first opening and closing mold and a second opening and closing mold, at least one of the first opening and closing mold and the second opening and closing mold is rotatably connected to the column, and the first opening and closing mold rotatably covers the second opening and closing mold;

[0007] The inner wall of the outer mold and the outer wall of the inflatable inner mold form a specimen forming area, and both the inner wall of the outer mold and the outer surface of the inflatable inner mold are provided with a diaphragm layer.

[0008] As an improvement to the above solution, the inflatable inner mold has an inflation end and a deflation end, both of which are connected to the inflation device.

[0009] As an improvement to the above solution, the pedestal is provided with a base plate, the base plate having a mounting hole, and one of the inflation end and the deflation end is mounted in the mounting hole.

[0010] As an improvement to the above solution, the first opening and closing mold has a mold body and a first connecting rod. The bottom of the mold body is connected to the base, one end of the first connecting rod is connected to the mold body, and the other end of the first connecting rod is rotatably connected to the column.

[0011] The mold body has a closed surface, and the closed surface is provided with a sealing element; the second opening and closing mold has the same structure as the first opening and closing mold.

[0012] As an improvement to the above solution, the platform includes an upper base, a lower base, and multiple vibrating elements. The multiple vibrating elements are spaced apart and surround the outer side of the upper base. The upper base and the lower base are connected by an elastic support rod.

[0013] As an improvement to the above solution, a horizontal indicator is provided on the top surface of the upper base.

[0014] As an improvement to the above solution, a strain gauge bonding component is also included, which includes a positioning disk, a pressing component, a transmission assembly, and a positioning bonding assembly.

[0015] The positioning plate is installed on the column, the pressing member is connected to the positioning plate, the protruding end of the pressing member is connected to the transmission assembly, the transmission assembly is connected to the positioning adhesive assembly, and the transmission assembly is used to convert the vertical movement of the pressing member into the lateral movement of the positioning adhesive assembly.

[0016] As an improvement to the above solution, the positioning and bonding assembly includes a positioning plate for connecting the strain gauge and a transverse extension rod, wherein the positioning plate is installed at the end of the transverse extension rod away from the transmission assembly;

[0017] The transmission assembly includes a vertical rack, a horizontal rack, and a transmission gear set, wherein the vertical rack is connected to the extended end of the pressing member, the horizontal rack is connected to the end of the horizontal extension rod facing the transmission assembly, and both the vertical rack and the horizontal rack are connected to the transmission gear set for transmission.

[0018] As an improvement to the above solution, a linkage rod is provided inside the positioning plate. The middle part of the linkage rod is rotatably connected to the positioning plate. One end of the linkage rod is connected to a first movable block, and the other end of the linkage rod is connected to a second movable block. Both the first movable block and the second movable block are slidably connected to the positioning plate. The length of the first movable block is greater than the length of the second movable block. The first movable block forms an insert groove, and the second movable block is located inside the insert groove.

[0019] As an improvement to the above solution, the positioning disk is provided with a telescopic component, and the extended end of the telescopic component is connected to the transmission assembly.

[0020] Implementing this utility model has the following beneficial effects:

[0021] In this embodiment, when preparing hollow structural specimens using a reinforced hollow structural specimen preparation device, an inflatable inner mold is used as the inner core for specimen molding. A diaphragm layer is arranged on the outer surface of the inflatable inner mold and the inner wall of the outer mold. After the specimen initially solidifies, the internal gas of the inflatable inner mold is released, and the inflatable inner mold contracts, causing the outer surface of the inflatable inner mold to separate from the inner wall of the specimen. Furthermore, the diaphragm layer provides a protective layer for demolding the inflatable inner mold, preventing it from adhering to the inner surface of the specimen. This allows the inflatable inner mold to be removed without damage, ensuring that it can be re-inflated and reused in subsequent specimen preparations. This achieves the recycling of the inflatable inner mold, reduces the number of steps required to replace the inflatable inner mold during specimen preparation, effectively ensures the efficiency of hollow structural specimen preparation, and effectively reduces the cost of specimen preparation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sample preparation device for reinforced hollow structure specimens in this utility model;

[0023] Figure 2 This is a schematic diagram of the base structure in this utility model;

[0024] Figure 3 This is a structural schematic diagram of the first or second outer mold in this utility model;

[0025] Figure 4 This is a schematic diagram of the positioning component in this utility model;

[0026] Figure 5 This is a cross-sectional structural schematic diagram of the positioning component in this utility model;

[0027] Figure 6 This is a schematic diagram showing the position and structure of the strain gauge bonding component and the hollow structure specimen in this utility model;

[0028] Figure 7 This is a cross-sectional structural schematic diagram of the strain gauge bonding component in this utility model;

[0029] Figure 8 This is a schematic diagram of the connection structure between the positioning and bonding component and the transmission component in this utility model;

[0030] Figure 9 This is a cross-sectional view of the positioning and pasting component in this utility model;

[0031] Figure 10 This is a schematic diagram of the transmission component in this utility model. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0033] In embodiments of this utility model, such as Figures 1 to 3 As shown, the sample preparation device for reinforced hollow structural specimens includes a base 1, a column 2, an inflatable inner mold 3, and an outer mold 4. The inflatable inner mold 3 is disposed on the base 1 and is connected to an inflation device 31. The inflation device 31 can inflate the inflatable inner mold 3 before sample preparation and ensure that the internal air pressure of the inflatable inner mold 3 can withstand the pressure generated during concrete pouring. The outer mold 4 includes a first opening and closing mold 41 and a second opening and closing mold 42. At least one of the first opening and closing mold 41 and the second opening and closing mold 42 is rotatably connected to the column 2. The first opening and closing mold 41 rotatably covers the second opening and closing mold 42. Preferably, both the first opening and closing mold 41 and the second opening and closing mold 42 are rotatably connected to the column 2. The inner wall of the outer mold 4 and the outer wall of the inflatable inner mold 3 form a specimen molding area. The inner wall of the outer mold 4 and the outer surface of the inflatable inner mold 3 are both provided with a diaphragm layer. The diaphragm layer can reduce the adhesion and friction between the inner wall of the specimen and the inflatable inner mold 3, and between the outer wall of the specimen and the outer mold 4, thereby reducing the adhesion between the specimen and the inflatable inner mold 3 and the outer mold 4.

[0034] In this embodiment, when preparing hollow structural specimens using a reinforced hollow structural specimen preparation device, an inflatable inner mold 3 is used as the inner core for specimen molding. A diaphragm layer is arranged on the outer surface of the inflatable inner mold 3 and the inner wall of the outer mold 4. After the specimen initially solidifies, the internal gas of the inflatable inner mold 3 is released, and the inflatable inner mold 3 contracts, allowing the outer surface of the inflatable inner mold 3 to separate from the inner wall of the specimen. Furthermore, the diaphragm layer provides a protective layer for the inflatable inner mold 3 during demolding, preventing it from adhering to the inner surface of the specimen. This allows the inflatable inner mold 3 to be removed without damage, ensuring that it can be re-inflated and reused in subsequent specimen preparations. This achieves the recycling of the inflatable inner mold 3, reduces the number of steps required to replace it during specimen preparation, effectively ensures the efficiency of hollow structural specimen preparation, and effectively reduces the cost of specimen preparation.

[0035] It should be noted that the diaphragm layer is preferably a release agent. The release agent is applied to the inner wall surface of the outer mold 4 and the outer wall surface of the inflatable inner mold 3 to form a diaphragm layer, so as to provide surface protection for the test piece, the inflatable inner mold 3 and the outer mold 4 when the hollow structure test piece is demolded, and to ensure demolding without damage.

[0036] It should also be noted that the inflatable inner mold 3 is preferably a rubber air bladder. To facilitate the detection of the internal air pressure of the inflatable inner mold 3, an air pressure sensor is arranged in the air cavity of the inflatable inner mold 3. The air pressure sensor is wirelessly connected to the inflation device 31 so that the internal air pressure of the inflatable inner mold 3 can be detected by the air pressure sensor, and the operation of the inflation device 31 can be adjusted according to the detection data feedback to ensure that the air pressure of the inflatable inner mold 3 can be maintained at the set air pressure, and to ensure that the inflatable inner mold 3 has sufficient compressive strength and stability.

[0037] The inflation device 31 can be a high-pressure gas cylinder or an electric air pump, and its arrangement can be selected according to the actual situation. The inflation device 31 is preferably arranged on the base 1. Its specific installation method is the existing technology and will not be described in detail here.

[0038] Specifically, to facilitate inflation and deflation of the inflatable inner mold 3 using the inflation device 31, the inflatable inner mold 3 is formed with an inflation end and a deflation end. Both the inflation end and the deflation end are connected to the inflation device 31, so that the inflation device 31 can be used to inflate the inflation end before the specimen preparation begins, and the inflation device 31 can be controlled to release the gas in the inflatable inner mold 3 from the deflation end after the specimen preparation is completed. This improves the installation speed of the inner mold during sample preparation and the demolding speed between the inner mold and the specimen during demolding, effectively improving sample preparation efficiency and saving operation steps.

[0039] Furthermore, to ensure the stability of the inflatable inner mold 3 on the base 1, such as... Figure 2 As shown, a base plate 117 is provided on the base 1, and the base plate 117 has a mounting hole 111. One of the inflation end and the deflation end is installed in the mounting hole 111, preferably the deflation end is inserted into the mounting hole 111, so as to prevent the inflation inner mold 3 from detaching from the base 1 during inflation and deflation, and to ensure the installation stability of the inflation inner mold 3.

[0040] Preferably, a quick-connect coupling is provided in the mounting hole 111. The deflation end of the inflatable inner mold 3 is inserted into the quick-connect coupling, and physical locking is achieved by the self-locking mechanism inside the quick-connect coupling. The other end of the quick-connect coupling is connected to the inflation device 31 via a hose, so that the air circuit connection is completed after the inflation end is inserted into the quick-connect coupling, improving the connection efficiency of the inflatable inner mold 3. The inflation end of the inflatable inner mold 3 can also be connected to the inflation device 31 via a hose.

[0041] In an optional embodiment, after the inflatable inner mold 3 is inflated, the specimen reinforcement 71 can be fitted into the inflatable inner mold 3, and the specimen reinforcement 71 can be positioned and fixed on the outer surface of the inflatable inner mold 3. To ensure the stability of the positioning and fixing of the specimen reinforcement 71, as follows... Figure 1 and Figure 4 As shown, the sample preparation device for reinforced hollow structural specimens also includes a positioning component 6. The positioning component 6 includes a positioning ring 61, a second connecting rod 62, multiple adjusting screws 63, and multiple positioning elements 64. The positioning ring 61 is fitted onto the outer wall of the inflatable inner mold 3. One end of the second connecting rod 62 is connected to the positioning ring 61, and the other end is connected to the column 2. Multiple adjusting screws 63 are arranged around the positioning ring 61, and each adjusting screw 63 is connected to a positioning element 64. The positioning element 64 has a positioning groove 641 formed on the side facing the reinforcement 71 of the specimen. When positioning the reinforcement 71 of the specimen, the positioning member 64 can be moved towards the reinforcement 71 of the specimen by adjusting the screw 63, so that the top steel bar of the reinforcement 71 of the specimen is inserted into the positioning groove 641 of the positioning member 64. By fine-tuning the adjusting screw 63, the reinforcement 71 of the specimen is kept vertical. At the same time, the spatial position of the reinforcement 71 of the specimen is controlled by measuring the extension length of the adjusting screw 63 above the positioning ring 61, so as to ensure that the relative distance between the reinforcement 71 of the specimen and the outer surface of the inflatable inner mold 3 is constant, thus completing the positioning of the reinforcement 71 of the specimen.

[0042] To fix the reinforcement 71 of the specimen, such as Figure 5 As shown, a magnetic suction element 642 is arranged on the inner wall of the positioning groove 641. The magnetic suction element 642 is preferably a strong electromagnetic sheet. The magnetic suction element 642 is electrically connected to an electric magnetic suction device 65. After the positioning of the specimen reinforcement 71 is completed, the electric magnetic suction device 65 energizes the magnetic suction element 642, so that the magnetic suction element 642 generates magnetism and magnetically fixes the specimen reinforcement 71, thereby completing the fixing operation of the specimen reinforcement 71.

[0043] Therefore, in this embodiment, the positioning ring 61 uses the inflatable inner mold 3 as the positioning reference, and the adjusting screw 63 cooperates with the positioning groove 641 of the positioning component 64 to complete the positioning and fixing of the specimen reinforcement 71. This can ensure the spatial position accuracy between the specimen reinforcement 71 and the inflatable inner mold 3 and outer mold 4, effectively ensure the uniformity of the specimen protective layer thickness after concrete pouring, and improve the specimen molding quality.

[0044] Meanwhile, using the positioning component 64 equipped with the magnetic suction component 642 as the positioning and fixing structure of the specimen reinforcement 71 can also ensure the reuse of the positioning component 64 in the subsequent preparation process, further reducing the preparation cost of the specimen.

[0045] In this embodiment, after the positioning and fixing of the specimen reinforcement 71 are completed, the first opening and closing mold 41 and the second opening and closing mold 42 can be rotated to cover the inflatable inner mold 3 and the specimen reinforcement 71, so as to facilitate the subsequent pouring of concrete to form the specimen. To facilitate the rotation and closing of the first opening and closing mold 41 and the second opening and closing mold 42, as follows... Figure 3 As shown, the first opening and closing mold 41 has a mold body 411 and a first connecting rod 412. The bottom of the mold body 411 is connected to the base 1. Preferably, the base 1 has a groove in which the bottom plate of the mold body 411 is fitted. One end of the first connecting rod 412 is connected to the mold body 411, and the other end of the first connecting rod 412 is rotatably connected to the column 2. The mold body 411 has a closing surface 413, and the closing surface 413 is provided with a sealing element 414. The second opening and closing mold 42 has the same structure as the first opening and closing mold 41.

[0046] After the reinforcement 71 of the specimen is positioned, the first and second opening and closing molds 41 and 42 can be rotated toward the inflatable inner mold 3 so that the closed surface 413 of the first opening and closing mold 41 abuts against the closed surface 413 of the second opening and closing mold 42. The sealing element 414 of the closed surface 413 is used to seal the first and second opening and closing molds 41 and 42 to prevent concrete from leaking from the connection gap between the closed surfaces 413 during subsequent pouring. Then, the first and second opening and closing molds 41 and 42 are connected by fasteners such as bolts or screws to ensure the overall stability of the outer mold 4.

[0047] Preferably, a screw plate 415 protrudes from the outer side of the closed surface 413, and bolt connection holes are arranged in the screw plate 415 so as to close and connect the first opening and closing mold 41 and the second opening and closing mold 42 by means of bolts or screws.

[0048] It should also be noted that, in order to improve the first opening and closing mold 41 and the second opening and closing mold 42 to have sufficient compressive strength and stability, multiple longitudinal ribs 417 and transverse ribs 416 are arranged on the outer side of the mold body 411 to ensure that the first opening and closing mold 41 and the second opening and closing mold 42 can withstand the pressure applied by the concrete during concrete pouring, and to ensure the molding quality and molding efficiency of the specimen.

[0049] As an optional embodiment, to ensure the compactness of the specimen during molding, such as Figure 2As shown, the test platform 1 includes an upper base 112, a lower base 113, and multiple vibrating elements 114. The multiple vibrating elements 114 are spaced around the outer surface of the upper base 112. This allows the vibrating elements 114 around the upper base 112 to vibrate the lower base 113 when concrete is poured between the outer mold 4 and the inflatable inner mold 3. The vibration is then transmitted to the concrete through the lower base 113 and the outer mold 4, expelling air bubbles generated during pouring and increasing the density of the concrete during specimen molding, thus obtaining hollow structural specimens with higher strength. The upper base 112 and the lower base 113 are connected by an elastic support rod 115. When the vibrating elements 114 vibrate the lower base 113, the elastic support rod 115 absorbs the vibration transmitted from the upper base 112 to the lower base 113, effectively preventing vibration from affecting the surrounding testing equipment.

[0050] Preferably, the vibrator 114 is a high-frequency micro-vibrator, which utilizes the characteristics of high frequency (usually operating above 100Hz) and small amplitude to ensure the vibration effect on concrete. The high-frequency micro-vibrator can be fixed to the lower base 113 with matching bolts.

[0051] Furthermore, a horizontal indicator 116 is provided on the top surface of the upper base 112. The horizontal indicator 116 is preferably a spirit level. After the outer mold 4 surrounds the specimen reinforcement 71 and the inflatable inner mold 3, the horizontal indicator 116 on the top surface of the upper base 112 can be used to check whether the upper base 112 is horizontal, ensuring that the specimen does not become skewed after molding, and further ensuring the molding quality of the specimen.

[0052] Furthermore, it should be noted that, to facilitate subsequent experimental studies on the internal mechanical behavior of hollow structural specimens under complex loads, strain gauges are typically attached to the inner wall surface of the hollow structural specimens. Current techniques usually employ manual attachment of strain gauges, but this is difficult when attaching deeper strain gauges, and can easily affect the attachment efficiency.

[0053] As an optional embodiment, to facilitate the attachment of strain gauges to the inner wall surface of the hollow structure specimen, such as... Figure 1 , Figure 6 and Figure 7As shown, the sample preparation device for reinforced hollow structural specimens also includes a strain gauge bonding component 5. The strain gauge bonding component 5 includes a positioning plate 51, a pressing member 52, a transmission assembly 53, and a positioning bonding component 54, wherein the positioning bonding component 54 is used to install the strain gauges. The positioning plate 51 is mounted on the column 2, the pressing member 52 is connected to the positioning plate 51, and the protruding end of the pressing member 52 is connected to the transmission assembly 53. The transmission assembly 53 is drively connected to the positioning bonding component 54. The transmission assembly 53 is used to convert the vertical movement of the pressing member 52 into the lateral movement of the positioning bonding component 54. Specifically, when the pressing member 52 moves downward, the positioning bonding component 54 moves laterally towards the inner wall surface of the hollow structural specimen; when the pressing member 52 moves upward, the positioning bonding component 54 moves laterally away from the hollow structural specimen.

[0054] Understandably, when attaching strain gauges, the positioning plate 51 can be placed on the top surface of the hollow structure specimen, and the pressing member 52, the transmission assembly 53, and the positioning and attaching assembly 54 can be inserted into the hollow cavity inside the hollow structure specimen. At this time, the distance between the transmission assembly 53 and the positioning plate 51 can be adjusted to move the positioning and attaching assembly 54, on which the strain gauge is installed, to a preset depth, where the preset depth is the depth at which the strain gauge needs to be installed in the hollow structure specimen. Subsequently, through the pressing member 52 and the transmission assembly 53, the positioning and attaching assembly 54 moves laterally towards the inner wall surface of the hollow structure specimen, thereby moving and attaching the strain gauge to the inner wall surface of the hollow structure specimen, completing the attachment of the strain gauge at the preset depth.

[0055] Therefore, during the entire strain gauge bonding process, the operator only needs to perform the depth adjustment of the transmission component 53 and the pressing action of the pressing component 52 on the outside of the hollow structure specimen, which effectively solves the problem of the difficulty of manually bonding strain gauges on the inner wall of the hollow structure specimen, thereby ensuring the bonding efficiency of strain gauges.

[0056] It should be noted that the pressing component 52 may include a sleeve and a pressing rod. The sleeve is connected to the top surface of the positioning plate 51, and the pressing rod passes through the sleeve and is connected to the transmission assembly 53. By pressing the top of the pressing rod, the pressing rod moves downward. The sleeve is provided with an elastic element such as a spring, and the side of the pressing rod has protrusions. When the pressing rod moves downward, the protrusions compress the elastic element, causing the elastic element to undergo elastic deformation, so that the pressing rod can spring back to its original position when released, facilitating the subsequent bonding of strain gauges.

[0057] Specifically, such as Figure 8 and Figure 10As shown, the positioning and bonding assembly 54 includes a positioning plate 541 for connecting the strain gauge and a transverse extension rod 542. The positioning plate 541 is mounted on the end of the transverse extension rod 542 away from the transmission assembly 53. To ensure that the vertical movement of the pressing member 52 can be effectively converted into the transverse movement of the positioning and bonding assembly 54, the transmission assembly 53 includes a vertical rack 531, a transverse rack 532, and a transmission gear set 533. The vertical rack 531 is connected to the extended end of the pressing member 52, and the transverse rack 532 is connected to the end of the transverse extension rod 542 facing the transmission assembly 53. Both the vertical rack 531 and the transverse rack 532 are connected to the transmission gear set 533. Specifically, the transmission gear set 533 can be three meshing spur gears 534, wherein the first spur gear 534 meshes with the vertical rack 531, the third spur gear 534 meshes with the horizontal rack 532, and the second spur gear 534 simultaneously meshes with the first spur gear 534 and the third spur gear 534.

[0058] Furthermore, when the pressing member 52 is driven to move downward, the extended end of the pressing member 52 drives the vertical rack 531 to move downward, correspondingly driving the transmission gear set 533 to mesh and rotate. Under the transmission action of the transmission gear set 533, the transverse rack 532 drives the transverse extension rod 542 and the positioning plate 541 to move towards the hollow structure specimen, thereby realizing the movement of the strain gauge towards the hollow structure specimen and its adhesion to the hollow structure specimen, completing the adhesion action of the hollow structure specimen. The meshing transmission of the transmission gear set 533 ensures that the transverse extension rod 542 can provide adhesion pressure perpendicular to the inner wall surface of the specimen to the positioning plate 541 and the strain gauge, effectively guaranteeing the success rate and adhesion stability of the strain gauge adhesion to the inner wall surface of the hollow structure specimen.

[0059] Furthermore, such as Figure 9 As shown, a linkage rod 511 is provided inside the positioning plate 541. The middle part of the linkage rod 511 is rotatably connected to the positioning plate 541. One end of the linkage rod 511 is connected to a first movable block 512, and the other end of the linkage rod 511 is connected to a second movable block 513, so that a lever structure is formed between the first movable block 512 and the second movable block 513. The first movable block 512 has an insert groove 514, and the strain gauge can be embedded in the insert groove 514 to ensure that the strain gauge moves with the first movable block 512. The first movable block 512 and the second movable block 513 are both slidably connected to the positioning plate 541, and the length of the first movable block 512 is greater than the length of the second movable block 513. The second movable block 513 is located inside the insert groove 514.

[0060] Then, when the positioning plate 541 drives the first movable block 512 and the second movable block 513 to move towards the inner wall of the hollow structure specimen, the first movable block 512 can press against the inner wall of the hollow structure specimen before the second movable block 513. Under the pressure of the inner wall of the hollow structure specimen, the first movable block 512 moves away from the inner wall of the hollow structure specimen. At the same time, under the action of the linkage rod 511, the second movable block 513 moves towards the inner wall of the hollow structure specimen, pushing the strain gauge out of the mounting groove 514 and pasting it onto the inner wall of the hollow structure specimen, thus completing the pasting action of the strain gauge. The lever transmission is used to ensure the uniformity of the pasting pressure of the strain gauge.

[0061] It should be noted that, for example Figure 9 As shown, a spring-loaded component 515 is provided between the first movable block 512 and the wall of the positioning plate 541. The spring-loaded component 515 is preferably a compression spring, which pushes the first movable block 512 back to its original position when the positioning plate 541 moves away from the inner wall of the hollow structure specimen, and at the same time makes the second movable block 513 move back into the mounting groove 514 so that the strain gauge can be pasted in the future.

[0062] It should also be noted that the positioning plate 541 is also provided with a protrusion 516, and a snap hole 517 is provided in the protrusion 516. After the strain gauge is installed in the mounting groove 514, its wire can pass through the snap hole 517 to ensure the installation stability of the strain gauge.

[0063] Furthermore, it should be noted that the strain gauges need to be adhered to different depths on the inner wall of the hollow structure specimen in order to conduct experimental research on the stress on the inner wall at different depths of the hollow structure specimen. In this embodiment, the positioning disk 51 is provided with a telescopic member 55, the protruding end of which is connected to the transmission assembly 53. Therefore, when it is necessary to adjust the preset depth of strain gauge adhesion, the relative distance between the transmission assembly 53 and the positioning disk 51 can be adjusted by adjusting the protruding length of the telescopic member 55, thereby completing the adjustment of the strain gauge adhesion depth.

[0064] Preferably, such as Figure 7 As shown, the telescopic component 55 consists of two adjusting screws. The upper end of one adjusting screw is connected to the positioning plate 51, and the upper end of the other adjusting screw is threadedly connected to one of the adjusting screws. The transmission component 53 is also equipped with a transmission box, which has a connecting block. The connecting block is threadedly connected to the lower end of the other adjusting screw 63. By adjusting the extension length of the two adjusting screws, the relative distance between the transmission component 53 and the positioning plate 51 is adjusted, thereby adjusting the strain gauge bonding depth.

[0065] It should be noted that the transmission box has vertical and horizontal grooves inside. The vertical rack 531 is slidably connected to the vertical groove, and the horizontal rack 532 is slidably connected to the horizontal groove. The top and bottom of the transmission box have coaxial through holes. The pressing rod passes through the through holes into the transmission box and connects with the connecting protrusion 516 on the back of the vertical groove, so that the pressing rod can press the vertical groove to complete the motion transmission between the vertical rack 531 and the horizontal rack 532.

[0066] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A sample preparation device for reinforced hollow structural specimens, characterized in that, It includes a base, a column, an inflatable inner mold and an outer mold, wherein the inflatable inner mold is disposed on the base and is connected to an inflation device; The outer mold includes a first opening and closing mold and a second opening and closing mold, at least one of the first opening and closing mold and the second opening and closing mold is rotatably connected to the column, and the first opening and closing mold rotatably covers the second opening and closing mold; The inner wall of the outer mold and the outer wall of the inflatable inner mold form a specimen forming area, and both the inner wall of the outer mold and the outer surface of the inflatable inner mold are provided with a diaphragm layer.

2. The apparatus for preparing reinforced hollow structural specimens as described in claim 1, characterized in that, The inflatable inner mold has an inflation end and a deflation end, both of which are connected to the inflation device.

3. The sample preparation device for reinforced hollow structural specimens as described in claim 2, characterized in that, The pedestal is provided with a base plate, and the base plate has a mounting hole. One of the inflation end and the deflation end is mounted in the mounting hole.

4. The sample preparation device for reinforced hollow structural specimens as described in claim 1, characterized in that, The first opening and closing mold has a mold body and a first connecting rod. The bottom of the mold body is connected to the base. One end of the first connecting rod is connected to the mold body, and the other end of the first connecting rod is rotatably connected to the column. The mold body has a closed surface, and the closed surface is provided with a sealing element; the second opening and closing mold has the same structure as the first opening and closing mold.

5. The sample preparation device for reinforced hollow structural specimens as described in claim 1, characterized in that, The platform includes an upper base, a lower base, and multiple vibrating elements. The multiple vibrating elements are spaced apart and surround the outer side of the upper base. The upper base and the lower base are connected by an elastic support rod.

6. The sample preparation device for reinforced hollow structural specimens as described in claim 5, characterized in that, A horizontal indicator is provided on the top surface of the upper base.

7. The apparatus for preparing reinforced hollow structural specimens as described in claim 1, characterized in that, It also includes a strain gauge bonding component, which comprises a positioning plate, a pressing component, a transmission assembly, and a positioning bonding assembly; The positioning plate is installed on the column, the pressing member is connected to the positioning plate, the protruding end of the pressing member is connected to the transmission assembly, the transmission assembly is connected to the positioning adhesive assembly, and the transmission assembly is used to convert the vertical movement of the pressing member into the lateral movement of the positioning adhesive assembly.

8. The sample preparation device for reinforced hollow structural specimens as described in claim 7, characterized in that, The positioning and bonding assembly includes a positioning plate for connecting the strain gauge and a transverse extension rod, wherein the positioning plate is mounted on the end of the transverse extension rod away from the transmission assembly; The transmission assembly includes a vertical rack, a horizontal rack, and a transmission gear set, wherein the vertical rack is connected to the extended end of the pressing member, the horizontal rack is connected to the end of the horizontal extension rod facing the transmission assembly, and both the vertical rack and the horizontal rack are connected to the transmission gear set for transmission.

9. The sample preparation device for reinforced hollow structural specimens as described in claim 8, characterized in that, A linkage rod is provided inside the positioning plate. The middle part of the linkage rod is rotatably connected to the positioning plate. One end of the linkage rod is connected to a first movable block, and the other end of the linkage rod is connected to a second movable block. Both the first movable block and the second movable block are slidably connected to the positioning plate. The length of the first movable block is greater than the length of the second movable block. The first movable block forms an insert groove, and the second movable block is located inside the insert groove.

10. The sample preparation device for reinforced hollow structure specimens as described in claim 7, characterized in that, The positioning plate is provided with a telescopic component, and the extended end of the telescopic component is connected to the transmission assembly.

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