An easy-to-measure concrete shrinkage test apparatus

Abstract

This solution discloses a concrete shrinkage testing device that facilitates measurement. Its core structure includes a chamber, a clamping device, a temperature control device, and a laser displacement sensor. The clamping device rotates an outer wheel of the chamber, driving a threaded shaft to push a three-pronged transmission component. This, in conjunction with a cross linkage, causes the slide rail to slide along a groove, achieving stable clamping of the concrete specimen. The temperature control device includes a temperature control chamber that can adjust the internal environment, with temperature and humidity sensors monitoring environmental data in real time. The laser displacement sensor is positioned towards the specimen to accurately collect dimensional data in various dimensions. Its advantages are: uniform force and no displacement on the specimen during clamping; uniform temperature and humidity regulation within the chamber, avoiding localized environmental fluctuations; the transmission structure of the wheel and threaded shaft directly drives the clamping action. Combined with the integrated design of the temperature control chamber and the precise detection of the laser displacement sensor, this simplifies the operation process while improving measurement accuracy, comprehensively ensuring both experimental measurement precision and ease of use.

Description

Technical Field

[0001] This utility model relates to the field of engineering, specifically to a concrete shrinkage test device that is easy to measure. Background Technology

[0002] Concrete shrinkage performance is a key indicator for evaluating its long-term stability and durability, directly affecting the crack resistance, strength retention, and service life of building structures. In a laboratory environment, specialized experimental equipment is needed to simulate different temperature and humidity conditions to accurately measure the shrinkage of concrete specimens, providing data support for engineering design and material formulation optimization.

[0003] Traditional recycling devices have two significant drawbacks: First, they lack dedicated, precise detection structures, relying heavily on manual measurement or external detection equipment. This makes it impossible to collect real-time dimensional data of the test blocks, resulting in long measurement intervals, large errors, and difficulty in accurately capturing the dynamic shrinkage process of the test blocks. Second, the temperature control components of traditional devices are mostly installed separately inside the chamber, lacking an independent temperature control compartment and a top grille ventilation structure. This leads to uneven airflow during temperature and humidity adjustment, causing localized temperature and humidity fluctuations within the chamber. Furthermore, the control board and display screen are often separate, requiring frequent switching between devices during operation. This prevents real-time synchronous display and adjustment of parameters, reducing experimental efficiency and environmental control accuracy. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a concrete shrinkage test device that facilitates measurement. The design involves placing a concrete specimen between the jaws of a clamping device inside the chamber, rotating the outer wheel of the chamber to cause the left and right jaw seats to drive the jaws to stably clamp the specimen. After the device is started, the temperature and humidity sensors of the temperature control device monitor the environmental data inside the chamber in real time and transmit the data to the control mainboard at the chamber door. The control mainboard displays the data on the screen and simultaneously drives the heater and humidifier inside the temperature control chamber to adjust the temperature and humidity according to preset parameters. The ventilation fan circulates air inside the chamber through the grille at the top of the chamber.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a concrete shrinkage testing device for easy measurement, comprising a chamber, a clamping device inside the chamber, a temperature control device above the clamping device, a control main board on the chamber door, and a display screen above the control main board.

[0006] The clamping device includes a gripper base, which is symmetrically arranged on the left and right sides. Slide rails are fixedly installed at both ends of the bottom of the gripper base. Slide rails have corresponding grooves at their bottom positions, and the slide rails slide in conjunction with the grooves. A limiting guide seat, fixed to the bottom of the box, is located in the middle section of the slide rail. The limiting guide seat is a rectangular block structure with a through groove on its inner side that matches the slide rail. The slide rail passes through the through groove of the limiting guide seat. A rotating wheel is located on the outer wall of the box, rotatably connected to the outer wall. A threaded shaft is located on the side wall of the box corresponding to the center of the rotating wheel. One end of the threaded shaft is fixedly connected to the center of the rotating wheel, and the other end extends through the side wall of the box into the interior. The extended end is fixedly connected to a Y-shaped three-pronged transmission component. The three top ends of the three-pronged transmission component are hinged to connecting blocks via pins. Two of these connecting blocks, located away from the three-pronged transmission component, are respectively hinged to the ends of the two slide rails at the bottom of the left gripper seat near the inner wall of the housing. A lifting-type cross linkage is provided on the opposite side of the three-pronged transmission component, consisting of multiple symmetrically distributed X-shaped structures. Each cross linkage consists of two rigid connecting rods of the same length, hinged at the middle via pins. The four top ends of the cross linkage are hinged to connecting rod seats via pins. The connecting rod seats are respectively welded to the slide rails at the bottom of the left and right gripper seats, away from the rotating wheel ends. The gripper seats are fixedly mounted on the side facing the test block.

[0007] The temperature control device includes a temperature control chamber, which is a rectangular chamber structure and is fixedly covered on the top of the box. An air exchange fan is provided at the bottom of the temperature control chamber. A grille is provided on the top of the box at the position corresponding to the air exchange fan. The grille is connected to the interior of the temperature control chamber. A temperature and humidity sensor is provided on the inner side wall of the temperature control chamber. The temperature and humidity sensor is fixed to the inner side wall of the temperature control chamber near the grille by a bracket. A heater is provided inside the temperature control chamber. The heater is a plate structure. A humidifier is provided in the top corner of the temperature control chamber. The humidifier is fixedly installed on the top of the temperature control chamber with the atomizing port facing the interior of the temperature control chamber.

[0008] Furthermore, the control motherboard is connected to the ventilation fan, temperature and humidity sensor, heater, humidifier, display screen, and laser displacement sensor via wires. It can receive detection data from the temperature and humidity sensor and test block size data collected by the laser displacement sensor, and transmit the two types of data synchronously to the display screen for partitioned display. At the same time, it can drive the ventilation fan, heater, and humidifier to start and stop to adjust the environment. It can also control the laser displacement sensor to automatically collect test block size data at preset time intervals, and calculate the test block shrinkage based on the initial data and real-time data, and display the calculation results synchronously on the display screen.

[0009] Furthermore, the gripper is an arc-shaped plate structure with a flexible buffer pad attached to its inner side. The flexible buffer pad is made of elastic rubber and has anti-slip texture on its surface.

[0010] Furthermore, the inner side of the through groove of the limiting guide seat is provided with a wear-resistant bushing, which is made of polytetrafluoroethylene, and the slide rail slides in conjunction with the wear-resistant bushing.

[0011] Furthermore, a lubricating bearing is sleeved on the outer side of the pin of the cross link, and the lubricating bearing is interference-fitted with the hinge hole of the link.

[0012] Furthermore, the outer wall of the rotating wheel is provided with anti-slip ridges, which are ring-shaped raised strips. A rotating handle is provided at the center of the side of the rotating wheel away from the housing. The rotating handle is integrally formed with the rotating wheel, making it easy to hold and rotate the rotating wheel.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. Strong structural coordination ensures experimental stability and ease of operation: The clamping device, through symmetrical gripper seats, multiple sets of cross linkages and slide rails, and limit guide seats, combined with the direct transmission of the rotating wheel and threaded shaft, achieves symmetrical and stable clamping of the test block, avoiding displacement and uneven force; The independent rectangular temperature control chamber integrates ventilation fans, heaters, and humidifiers, and with the top grille, forms a uniform airflow circulation, which can quickly adjust the environment inside the chamber. Moreover, the temperature control chamber and clamping device are arranged vertically and integrated in transmission operation, simplifying the process, reducing the difficulty of operation, and adapting to the needs of long-term stable experiments.

[0015] 2. High level of intelligent detection, improving measurement accuracy and efficiency: Laser displacement sensors are installed on the top and side walls of the chamber, with the detection end facing the test block. They can accurately collect the three-dimensional size data of the test block in real time and dynamically capture the shrinkage process. The sensors are linked with the control motherboard and display screen, which can automatically calculate the shrinkage amount and display it in real time without manual intervention or external equipment. This completely solves the problems of detection lag and large error of traditional devices, and greatly improves measurement efficiency and accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a concrete shrinkage test device that is easy to measure according to the present invention;

[0017] Figure 2 This is a schematic diagram of the clamping device structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the control motherboard and display screen of this utility model;

[0019] Figure 4 This is a schematic diagram of the rotary structure of this utility model.

[0020] In the diagram: 1. Housing; 2. Clamping device; 201. Gripper seat; 202. Slide rail; 203. Limit guide seat; 204. Rotary wheel; 205. Threaded shaft; 206. Three-way transmission component; 207. Cross linkage; 208. Gripper; 3. Temperature control device; 301. Temperature control chamber; 302. Ventilation fan; 303. Temperature and humidity sensor; 304. Heater; 305. Humidifier; 4. Control main board; 5. Display screen. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This embodiment provides a concrete shrinkage testing device for easy measurement, comprising a housing 1, a clamping device 2 inside the housing 1, a temperature control device 3 above the clamping device 2, a control main board 4 on the door of the housing 1, a display screen 5 above the control main board 4, and laser displacement sensors 6 on the top and side walls inside the housing 1.

[0023] The clamping device 2 includes a gripper seat 201, which is symmetrically arranged on the left and right sides. Slide rails 202 are fixedly installed at both ends of the bottom of the gripper seat 201. Slide rails 202 have corresponding grooves at their bottom positions, and the slide rails 202 are slidably connected to the grooves. A limiting guide seat 203, fixed to the bottom of the inner side of the housing 1, is provided in the middle section of the slide rail 202. The limiting guide seat 203 is a rectangular block structure with a through groove on its inner side that matches the slide rail 202. The slide rail 202 passes through the through groove of the limiting guide seat 203. A rotating wheel 204 is provided on the outer wall of the housing 1, rotatably connected to the outer wall of the housing 1. A threaded shaft 205 is provided on the side wall of the housing 1 at the center position corresponding to the rotating wheel 204. One end of the threaded shaft 205 is fixedly connected to the center of the rotating wheel 204, and the other end extends through the side wall of the housing 1. Inside, the extended end is fixedly connected to a Y-shaped three-pronged transmission component 206. The three top ends of the three-pronged transmission component 206 are hinged to connecting blocks via pins. Two of these connecting blocks, at their ends away from the three-pronged transmission component 206, are hinged to the ends of the two slide rails 202 at the bottom of the left gripper seat 201 near the inner wall of the housing 1. On the opposite side of the three-pronged transmission component 206, there is a lifting-type cross link 207, which is a multi-set symmetrically distributed X-shaped structure. Each cross link 207 consists of two rigid links of the same length, hinged at the middle via pins. The four top ends of the cross link 207 are hinged to link seats via pins. The link seats are welded to the ends of the slide rails 202 at the bottom of the left and right gripper seats 201 away from the rotating wheel 204. Grippers 208 are fixedly installed on the side of the gripper seat 201 facing the test block.

[0024] The temperature control device 3 includes a temperature control chamber 301, which is a rectangular chamber structure and is fixedly covered on the top of the box 1. An air exchange fan 302 is provided at the bottom of the interior of the temperature control chamber 301. A grille is provided at the top of the box 1 corresponding to the air exchange fan 302. The grille is connected to the interior of the temperature control chamber 301. A temperature and humidity sensor 303 is provided on the inner side wall of the temperature control chamber 301. The temperature and humidity sensor 303 is fixed to the inner side wall of the temperature control chamber 301 near the grille by a bracket. A heater 304 is provided inside the temperature control chamber 301. The heater 304 is a plate structure. A humidifier 305 is provided at the top corner of the interior of the temperature control chamber 301. The humidifier 305 is fixedly installed on the top of the interior of the temperature control chamber 301 with the atomizing port facing the interior of the temperature control chamber 301.

[0025] The control board 4 is connected to the ventilation fan 302, temperature and humidity sensor 303, heater 304, humidifier 305, display screen 5, and laser displacement sensor 6 via wires. It can receive real-time temperature and humidity data from the temperature and humidity sensor 303 and concrete block size data collected by the laser displacement sensor 6. After connection, the two types of data can be transmitted to the display screen 5 simultaneously. The display screen 5's partition display function clearly separates the temperature and humidity information from the block size information, making it convenient for operators to view intuitively. At the same time, the control board 4 can drive the ventilation fan 302, heater 304, and humidifier 305 to start and stop flexibly according to preset parameters, so as to achieve precise adjustment of the environment inside the chamber. It can also automatically control the laser displacement sensor 6 to collect block size data at regular intervals according to the time intervals set by the experimental requirements, compare the initial data of the block with the real-time data, automatically calculate the block shrinkage, and then display the calculation results synchronously on the display screen 5. This eliminates the need for manual calculation, greatly reduces human error, and improves the efficiency of experimental data processing.

[0026] The gripper 208 adopts an arc-shaped plate structure, with a flexible buffer pad attached to its inner side. The flexible buffer pad is made of elastic rubber and has anti-slip textures on its surface. The arc-shaped plate structure allows the gripper 208 to fit more closely to the surface of the test block, increasing the contact area and avoiding excessive local pressure. The flexible buffer pad made of elastic rubber can buffer during clamping, effectively reducing the pressure of the gripper 208 on the surface of the test block and preventing damage or scratches to the test block. The anti-slip textures on the surface can enhance the friction between the gripper 208 and the test block, preventing the test block from sliding due to vibration or environmental changes during the experiment, ensuring clamping stability and laying the foundation for subsequent accurate measurements.

[0027] A wear-resistant bushing is installed inside the through groove of the limiting guide seat 203. The wear-resistant bushing is made of polytetrafluoroethylene (PTFE). A sliding fit is formed between the slide rail 202 and the wear-resistant bushing. PTFE has excellent wear resistance, which can effectively reduce the direct friction between the slide rail 202 and the limiting guide seat 203 when the slide rail 202 slides in the through groove, reduce the wear of both, and extend the service life of the limiting guide seat 203 and the slide rail 202. At the same time, the material also has a low coefficient of friction, which allows the slide rail 202 to slide more smoothly and avoids jamming of the slide rail 202 due to excessive frictional resistance, ensuring that the clamping action of the clamping device 2 is accurate and stable.

[0028] A lubricated bearing is fitted on the outer side of the pin of the cross link 207. The lubricated bearing and the hinge hole of the cross link 207 are assembled by an interference fit. When the cross link 207 rotates, the lubricated bearing can convert the sliding friction between the pin and the hinge hole into rolling friction, which significantly reduces the frictional resistance between the two, making the rotation of the cross link 207 more flexible and reducing energy loss in the transmission process. The interference fit can ensure that the lubricated bearing is tightly connected to the hinge hole, preventing the bearing from loosening or falling off during use, ensuring the stability of the transmission structure of the cross link 207, and thus making the clamping action of the clamping device 2 more reliable.

[0029] The outer wall of the rotating wheel 204 is machined with anti-slip ridges, which are designed as ring-shaped raised strips. A rotating handle is located at the center of the side of the rotating wheel 204 away from the housing 1. The rotating handle and the rotating wheel 204 are manufactured using an integral molding process. The ring-shaped anti-slip ridges can increase the friction between the operator's hand and the rotating wheel 204, preventing slippage when rotating the rotating wheel 204 and improving operational safety. The integrally molded rotating handle is ergonomically designed, making it easy for the operator to hold and reducing hand fatigue. At the same time, the integrally molded structure has higher strength and is not easy to break, ensuring that the operator can easily drive the rotating wheel 204 by rotating the handle, thereby driving the threaded shaft 205 to rotate and realize the clamping adjustment of the clamping device 2.

[0030] When the concrete shrinkage experimental device is in operation, the outer rotating wheel drives the transmission structure, which in turn drives the slide rail of the clamping device to slide, so that the grippers can stably hold the concrete specimen. Then, the components inside the temperature control chamber of the temperature control device work together to regulate the temperature and humidity inside the chamber, and the temperature and humidity sensors monitor the environmental data in real time. At the same time, the laser displacement sensor collects the specimen size data. All data is transmitted to the control motherboard, processed, and displayed in sections on the display screen. The control motherboard can also drive the start and stop of each component according to preset parameters, automatically calculate the shrinkage of the specimen and display the results synchronously, forming a complete experimental process.

[0031] This solution offers significant advantages. In terms of clamping, optimized gripper structure and transmission design ensure stable clamping of the specimen while preventing damage and reducing transmission losses. For temperature control, an integrated temperature control chamber and airflow circulation design rapidly and evenly regulate the environment, preventing localized fluctuations. In the testing phase, a laser displacement sensor enables real-time and accurate acquisition of specimen dimensions, coupled with automatic calculation by the control board, significantly reducing human error. Operationally, the integrated transmission structure and clear data display simplify the process and reduce fatigue. Overall, it balances experimental accuracy, efficiency, and ease of use, meeting the long-term stability requirements of concrete shrinkage testing.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete shrinkage test apparatus for facilitating measurement, comprising a box (1), characterized in that: The box (1) is equipped with a clamping device (2) inside, and a temperature control device (3) is provided above the clamping device (2). The box (1) is equipped with a control main board (4) on the door, and a display screen (5) is provided above the control main board (4). Laser displacement sensors (6) are provided on the top and side walls inside the box (1). The clamping device (2) includes a gripper seat (201), which is symmetrically arranged on the left and right sides. Slide rails (202) are fixedly installed at both ends of its bottom. Slide rails (202) are provided at corresponding positions at the bottom of the slide rails (202). The slide rails (202) are slidably connected to the slide rails (202). A limiting guide seat (203) is fixed to the bottom of the box (1) in the middle section of the slide rail (202). The limiting guide seat (203) is a rectangular block. The structure has an inner groove that fits the slide rail (202). The slide rail (202) passes through the groove of the limiting guide seat (203). A rotating wheel (204) is provided on the outer wall of the box body (1). The rotating wheel (204) is rotatably connected to the outer wall of the box body (1). A threaded shaft (205) is provided on the side wall of the box body (1) at the center position of the rotating wheel (204). One end of the threaded shaft (205) is fixedly connected to the center of the rotating wheel (204), and the other end... The end extends through the side wall of the housing (1) into the interior, and the extended end is fixedly connected to a Y-shaped three-pronged drive component (206). The three top ends of the three-pronged drive component (206) are all hinged to connecting blocks by pins. The ends of two connecting blocks away from the three-pronged drive component (206) are respectively hinged to the ends of the two slide rails (202) at the bottom of the left gripper seat (201) near the inner side wall of the housing (1). A lifting-type cross connection is provided on the opposite side of the three-pronged drive component (206). The rod (207) is a multi-group symmetrically distributed X-shaped structure. Each group of cross rods (207) consists of two rigid rods of the same length. The middle of the rods is hinged by a pin. The four top ends of the cross rods (207) are all hinged to the rod seats by pins. The rod seats are respectively welded to the slide rails (202) at the bottom of the left and right gripper seats (201) away from the rotating wheel (204). The gripper seats (201) are fixedly installed with grippers (208) on the side facing the test block. The temperature control device (3) includes a temperature control chamber (301), which is a rectangular chamber structure and is fixedly covered on the top of the box (1). An air exchange fan (302) is provided at the bottom of the interior of the temperature control chamber (301). A grille is provided on the top of the box (1) corresponding to the air exchange fan (302). The grille is connected to the interior of the temperature control chamber (301). A temperature and humidity sensor (303) is provided on the inner side wall of the temperature control chamber (301). The temperature and humidity sensor (303) is fixed to the inner side wall of the temperature control chamber (301) near the grille by a bracket. A heater (304) is provided inside the temperature control chamber (301). The heater (304) is a sheet structure. A humidifier (305) is provided at the top corner inside the temperature control chamber (301). The humidifier (305) is fixedly installed on the top inside the temperature control chamber (301) with the atomizing port facing the inside of the temperature control chamber (301).

2. The concrete shrinkage testing device of claim 1, wherein: The control motherboard (4) is connected to the ventilation fan (302), temperature and humidity sensor (303), heater (304), humidifier (305), display screen (5) and laser displacement sensor (6) respectively via wires. It can receive the detection data of temperature and humidity sensor (303) and the test block size data collected by laser displacement sensor (6), and transmit the two types of data synchronously to the display screen (5) for partitioned display. At the same time, it can drive the ventilation fan (302), heater (304) and humidifier (305) to start and stop to adjust the environment. It can also control the laser displacement sensor (6) to automatically collect the test block size data at preset time intervals, and calculate the test block shrinkage based on the initial data and real-time data, and display the calculation results synchronously on the display screen (5).

3. The concrete shrinkage testing device of claim 1, wherein: The gripper (208) is an arc-shaped plate structure with a flexible buffer pad attached to its inner side. The flexible buffer pad is made of elastic rubber and has anti-slip texture on its surface.

4. The concrete shrinkage testing device of claim 1, wherein: The inner side of the through groove of the limiting guide seat (203) is provided with a wear-resistant bushing. The wear-resistant bushing is made of polytetrafluoroethylene. The slide rail (202) slides in conjunction with the wear-resistant bushing.

5. The concrete shrinkage testing device of claim 1, wherein: A lubricating bearing is fitted on the outer side of the pin of the cross link (207), and the lubricating bearing is interference-fitted with the hinge hole of the link.

6. The concrete shrinkage test apparatus for easy measurement according to claim 1, characterized in that: The outer wall of the wheel (204) is provided with anti-slip ridges, which are strip-shaped protrusions distributed in a ring. A rotating handle is provided at the center of the side of the wheel (204) away from the box (1). The rotating handle is integrally formed with the wheel (204) to facilitate gripping and rotating the wheel (204).

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