A low temperature test chamber for testing concrete samples

Abstract

The application relates to a low-temperature test box for concrete sample testing and relates to the technical field of concrete block environmental temperature testing, which comprises a test box body, a placing cavity is formed in the inside of the test box body, and observation glass is fixedly installed on the inside of the test box body. The observation glass can be used for directly observing the state of the concrete sample in the placing cavity, the change condition can be grasped without taking out the sample, the problem that the traditional pull-out placing box is inconvenient to observe is solved, convenience is brought to test operation, then the separation rod cooperates with the track groove and the slidingly connected moving frame, orderly distribution of multiple clamping assemblies is realized, multiple samples can be simultaneously tested, the position of the clamping assembly can be adjusted to adapt to different specifications of samples, the bidirectional screw rod in the clamping assembly drives the moving block and the clamping plate to be fixed only on the side of the sample, the sample is not hindered from being cooled, the number of freeze-thaw cycles does not need to be additionally increased, the test accuracy is ensured, and the test efficiency and reliability are improved.

Description

Technical Field

[0001] This application relates to the field of environmental temperature testing technology for concrete test blocks, and in particular to a low-temperature test chamber for testing concrete samples. Background Technology

[0002] A concrete freeze-thaw tester is a device used to evaluate the freeze-thaw resistance of concrete. Its main function is to simulate freeze-thaw cycles, that is, alternating exposure to cold and warm environments, to detect the performance changes of concrete specimens after undergoing multiple freeze-thaw cycles. The freeze-thaw cycle process is repeated to realize the freeze-thaw effect of the material in a simulated real environment.

[0003] An existing patent (publication number: CN222545264U) discloses a concrete freeze-thaw testing machine for easy sample handling. It includes a testing machine body and a concrete specimen container. The testing machine body has a placement cavity, within which a pull-out placement box is slidably inserted. A connecting block is fixedly installed at one end of the pull-out placement box, and a grounding roller is installed at the bottom of the connecting block. An elastic self-locking connecting component is fixedly installed on the side wall of the connecting block, and one end of the elastic self-locking connecting component is connected to a positioning block installed on the testing machine body. This design can limit the movement of the pull-out placement box and the concrete specimen container, preventing the concrete specimen container from shaking and causing the concrete sample to fall.

[0004] Currently, the above-mentioned solution uses a pull-out placement box to place concrete test blocks. However, concrete test blocks undergo 50-100 freeze-thaw cycles during testing, resulting in various phenomena after the test. One of these phenomena is that the concrete cracks and breaks due to the freezing of internal moisture. If the test blocks are placed in the pull-out placement box, the changes in the state of the concrete test blocks cannot be visually observed. The test blocks need to be removed to see the changes, which is inconvenient for the test blocks. Furthermore, the pull-out placement box also hinders the cooling of the test blocks to some extent. Therefore, the testing machine needs to increase the number of freeze-thaw cycles for the test blocks, which reduces the accuracy of the freeze-thaw test. Utility Model Content

[0005] The purpose of this application is to provide a low-temperature test chamber for testing concrete samples. The observation glass allows direct observation of the state of the concrete sample inside the chamber, enabling monitoring of changes without removing the sample. The partition rod, along with the track groove and slidingly connected movable frame, not only achieves an orderly distribution of multiple clamping components, allowing simultaneous testing of multiple samples, but also allows adjustment of the clamping component positions to accommodate samples of different sizes. Furthermore, the clamping components only fix the sides of the sample, without hindering cooling, eliminating the need for additional freeze-thaw cycles, ensuring test accuracy, and improving testing efficiency and reliability. This solves the problems mentioned in the background art.

[0006] The low-temperature test chamber for concrete sample testing provided in this application adopts the following technical solution: A low-temperature test chamber for concrete sample testing includes a test chamber body, an internal placement cavity, an observation glass fixedly installed on the inner side of the test chamber body, a controller fixedly installed on the outer side of the test chamber body, two symmetrical supports placed on the inner side of the placement cavity, a plurality of equally spaced partition rods fixedly connected between the two supports, a track groove opened on the outer side of each partition rod, a clamping assembly provided between each pair of adjacent partition rods, the clamping assembly including a movable frame slidably connected to the inner side of the track groove, a component cavity opened on the inner side of the movable frame, a bidirectional lead screw rotatably connected to the inner side of the component cavity, two symmetrical movable blocks threadedly connected to the outer side of the bidirectional lead screw, and clamping plates fixedly connected to the outer side of each of the two movable blocks.

[0007] By adopting the above technical solution, the state of the concrete sample inside the chamber can be directly observed using the observation glass, allowing for monitoring of changes without removing the sample, thus facilitating the testing operation. The partition rods allow for the orderly distribution of multiple clamping components, enabling simultaneous testing of multiple concrete samples. Simultaneously, the track groove provides a sliding path for the moving frame, facilitating adjustments to the position of the clamping components to adapt to the testing needs of samples of different sizes. When the bidirectional screw rotates, it drives two moving blocks to move in opposite directions along the screw, thereby causing the clamping plates to move synchronously, achieving stable clamping of concrete samples of different sizes and preventing sample displacement during testing. Furthermore, the clamping components only fix the sides of the sample, thus not hindering the sample's cooling process and eliminating the need for additional freeze-thaw cycles, ensuring the accuracy of the freeze-thaw test.

[0008] Preferably, each of the two side dividers has one track groove, and the two track grooves are symmetrically arranged. Each of the middle dividers has two track grooves, and the two track grooves are symmetrically arranged.

[0009] By adopting the above technical solution, the single track groove on the side partition rod and the two track grooves on the middle partition rod are symmetrically arranged, which can realize the orderly arrangement of multiple clamping components, improve the utilization rate of the internal space of the placement cavity, and allow more samples to be tested at the same time.

[0010] Preferably, the outer side of the movable frame is provided with a guide groove, and the inner wall of the guide groove is connected to the inner wall of the component cavity, and the outer sides of the two movable blocks are slidably connected to the inner side of the guide groove.

[0011] By adopting the above technical solution, the guide groove can restrict and guide the movement direction of the moving block, preventing the moving block from deviating as the bidirectional screw rotates, ensuring that the moving block drives the clamping plate to move stably, and thus ensuring the stability of the concrete sample clamping.

[0012] Preferably, the inner sides of both clamping plates are rotatably connected to a plurality of equally spaced pulleys.

[0013] By adopting the above technical solution, when placing or removing concrete samples, the pulley can convert the sliding friction between the sample and the clamping plate into rolling friction, reduce the friction between the sample and the clamping plate, avoid damage to the sample due to friction during placement or removal, and make the placement and removal of the sample more convenient and labor-saving.

[0014] Preferably, a worm gear is fixedly connected to the outer side of the bidirectional lead screw, and a worm is rotatably connected to the inner side of the component cavity, with the worm gear and the worm meshing with each other.

[0015] By adopting the above technical solution, the self-locking characteristics of the worm gear and worm meshing transmission are utilized to keep the bidirectional lead screw in a stable state, preventing the bidirectional lead screw from rotating due to external forces and causing the clamping plate to loosen, thus ensuring the reliability of the concrete sample clamping and preventing the sample from shifting during the test.

[0016] Preferably, the inner side of the movable frame is rotatably connected to a connecting shaft, one end of which is fixedly connected to one end of a worm gear, and the other end of the connecting shaft is fixedly connected to a rotating handle, the outer side of which is provided with anti-slip texture.

[0017] By adopting the above technical solution, the handle is connected to the worm gear through the connecting shaft. The operator can rotate the handle to drive the connecting shaft and the worm gear to rotate, providing a convenient operating component for adjusting the clamping plate. At the same time, the anti-slip texture on the outside of the handle can increase the friction between the operator's hand and the handle, making the operation more stable and reliable.

[0018] Preferably, two symmetrical fastening bolts are installed on the outer side of the movable frame, and the movable frame and the partition rod are fixedly connected by the fastening bolts.

[0019] By adopting the above technical solution, after the moving frame is adjusted to the appropriate position, tightening the fastening bolts can fix the moving frame and the dividing rod, preventing the moving frame from sliding along the track groove during the test and ensuring the overall stability of the clamping assembly.

[0020] Preferably, a drain pipe is installed inside the placement cavity, a water injection pipe is fixedly installed inside the placement cavity, and a sealing cover is installed on the upper side of the test chamber.

[0021] By adopting the above technical solution, the liquid required for testing can be injected into the placement chamber using the water injection pipe, which meets the low-temperature testing requirements of concrete samples in a specific liquid environment. The drain pipe can drain the liquid in the placement chamber in a timely manner, which is convenient for subsequent cleaning or liquid replacement. The sealing cover can seal the test chamber during the test to prevent the low-temperature environment in the placement chamber from being affected by the outside world.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This low-temperature test chamber for concrete sample testing allows direct observation of the concrete sample's condition within the chamber via an observation glass, enabling monitoring of changes without removing the sample. This solves the problem of inconvenient observation in traditional pull-out placement boxes, bringing convenience to the testing operation. Furthermore, the partition rod, along with the track groove and sliding connection of the moving frame, not only achieves an orderly distribution of multiple clamping components, allowing for simultaneous testing of multiple samples, but also allows for adjustment of the clamping component positions to accommodate samples of different sizes. Moreover, the bidirectional screw in the clamping component drives the moving block and clamping plate to fix only the sides of the sample, without hindering sample cooling. This eliminates the need for additional freeze-thaw cycles, ensuring test accuracy and improving testing efficiency and reliability. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the entire application; Figure 2 This is a cross-sectional structural diagram of the entire application; Figure 3 This is a three-dimensional structural diagram of the bracket, separator, and clamping assembly of this application; Figure 4 This is a schematic diagram of the internal structure of the separator bar in this application; Figure 5 This is a schematic diagram of the internal structure of the clamping component of this application.

[0024] In the picture: 1. Test chamber body; 2. Placement cavity; 3. Observation glass; 4. Controller; 5. Support; 6. Divider rod; 7. Track groove; 8. Clamping assembly; 801. Moving frame; 802. Assembly cavity; 803. Two-way lead screw; 804. Moving block; 805. Clamping plate; 806. Guide groove; 807. Pulley; 808. Worm gear; 809. Worm; 810. Connecting shaft; 811. Rotary handle; 812. Fastening bolt; 9. Drain pipe; 10. Water injection pipe; 11. Sealing cover. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0026] Example 1: A low-temperature test chamber for testing concrete samples, please refer to... Figure 1 , Figure 4 and Figure 5 The test chamber includes a test chamber body 1, which is existing equipment with built-in heating and cooling components. This allows the internal concrete sample to be cooled to a specified temperature, causing the internal moisture to frost and freeze. The temperature is then increased to melt the concrete, thus forming a single cycle. The test chamber body 1 has a placement cavity 2. An observation glass 3 is fixedly installed on the inner side of the test chamber body 1, allowing direct observation of the concrete sample's condition without removing the sample, thus facilitating testing. A controller 4 is fixedly installed on the outer side of the test chamber body 1. Two symmetrical supports 5 are placed inside the placement cavity 2, with multiple equidistantly arranged partition rods 6 fixedly connected between the two supports 5. The partition rods 6 allow for the orderly distribution of multiple clamping components 8, enabling simultaneous testing of multiple concrete samples. Each partition rod 6 has a track groove 7 on its outer side. A clamping assembly 8 is provided between each pair of adjacent separator bars 6. The clamping assembly 8 includes a movable frame 801 slidably connected to the inner side of the track groove 7. The inner side of the movable frame 801 has an assembly cavity 802. A bidirectional screw 803 is rotatably connected to the inner side of the assembly cavity 802. Two symmetrical movable blocks 804 are threadedly connected to the outer side of the bidirectional screw 803. A clamping plate 805 is fixedly connected to the outer side of each of the two movable blocks 804. When the bidirectional screw 803 rotates, it can drive the two movable blocks 804 to move in opposite directions along the bidirectional screw 803, thereby driving the clamping plate 805 to move synchronously, so as to achieve stable clamping of concrete samples of different sizes and avoid the samples from shifting during the test. At the same time, the clamping assembly 8 only fixes the side of the sample, so it will not hinder the sample from cooling and does not need to increase the number of freeze-thaw cycles of the sample, thus ensuring the accuracy of the freeze-thaw test.

[0027] Please refer to Figure 4 and Figure 5Both clamping plates 805 have multiple equidistantly arranged pulleys 807 rotatably connected to their inner sides. When placing or removing concrete samples, these pulleys 807 convert the sliding friction between the sample and the clamping plates 805 into rolling friction, reducing the frictional force between them and preventing damage during placement or removal. This also makes sample placement and removal more convenient and effortless. A worm gear 808 is fixedly connected to the outer side of the bidirectional lead screw 803, and a worm 809 is rotatably connected to the inner side of the component cavity 802. The worm gear 808 and worm 809 mesh, utilizing the self-locking characteristic of the meshing transmission between the worm gear 808 and worm 809 to maintain the bidirectional lead screw 803 in a stable state, preventing damage due to external factors. The force causes rotation, resulting in loosening of the clamping plate 805, ensuring the reliability of the concrete sample clamping and preventing sample displacement during testing. The inner side of the moving frame 801 is rotatably connected to the connecting shaft 810, and one end of the connecting shaft 810 is fixedly connected to one end of the worm gear 809. The other end of the connecting shaft 810 is fixedly connected to the handle 811. The outer side of the handle 811 is provided with anti-slip texture. The handle 811 is connected to the worm gear 809 through the connecting shaft 810. The operator can rotate the handle 811 to drive the connecting shaft 810 and the worm gear 809 to rotate, providing a convenient operating component for adjusting the clamping plate 805. At the same time, the anti-slip texture on the outer side of the handle 811 can increase the friction between the operator's hand and the handle 811, making the operation more stable and reliable.

[0028] Example 2: A low-temperature test chamber for testing concrete samples, please refer to... Figure 1 , Figure 2 and Figure 3 The two side partition rods 6 each have one track groove 7, and the two track grooves 7 are symmetrically arranged. The middle partition rod 6 each has two track grooves 7, and the two track grooves 7 are symmetrically arranged. The single track groove 7 on the side partition rod 6 and the two track grooves 7 on the middle partition rod 6 are symmetrically arranged, which can realize the orderly arrangement of multiple clamping components 8, improve the utilization rate of the internal space of the placement cavity 2, and allow more samples to be tested at the same time. A drain pipe 9 is installed on the inside of the placement cavity 2, and a water injection pipe 10 is fixedly installed on the inside of the placement cavity 2. A sealing cover 11 is installed on the upper side of the test chamber 1. The liquid required for testing can be injected into the placement cavity 2 through the water injection pipe 10 to meet the low temperature testing requirements of concrete samples in a specific liquid environment. The drain pipe 9 can drain the liquid in the placement cavity 2 in a timely manner, which is convenient for subsequent cleaning or liquid replacement. The sealing cover 11 can seal the test chamber 1 during the test to prevent the low temperature environment inside the placement cavity 2 from being affected by the outside.

[0029] Please refer to Figure 3 and Figure 5The outer side of the movable frame 801 is provided with a guide groove 806, and the inner wall of the guide groove 806 is connected to the inner wall of the component cavity 802. The outer sides of the two movable blocks 804 are slidably connected to the inner side of the guide groove 806. The guide groove 806 can restrict and guide the movement direction of the movable blocks 804, preventing the movable blocks 804 from shifting with the rotation of the bidirectional screw 803, ensuring that the movable blocks 804 drive the clamping plate 805 to move stably, thereby ensuring the stability of the concrete sample clamping. Two symmetrical fastening bolts 812 are installed on the outer side of the movable frame 801. The movable frame 801 and the separator rod 6 are fixedly connected by the fastening bolts 812. After the movable frame 801 is adjusted to a suitable position, tightening the fastening bolts 812 can fix the movable frame 801 and the separator rod 6, preventing the movable frame 801 from sliding along the track groove 7 during the test, and ensuring the overall stability of the clamping component 8.

[0030] The implementation principle of this application embodiment is as follows: First, according to the quantity and size of the concrete samples to be tested, adjust the position of the clamping assembly 8. Loosen the fastening bolts 812 on the outside of the moving frame 801, and push the moving frame 801 to slide in the track groove 7 of the separator rod 6. The single symmetrical track groove 7 of the side separator rod 6 and the two symmetrical track grooves 7 of the middle separator rod 6 provide a smooth sliding path for the moving frame 801. When the moving frame 801 reaches the appropriate position, tighten the fastening bolts 812 to fix it to the separator rod 6. Then, place the concrete sample between the two clamping plates 805 between adjacent separator rods 6. The pulleys 807 on the inner side of the clamping plates 805 reduce the friction when picking up and placing the sample, making it convenient for the sample to be placed. Afterward, the operator rotates the handle 811. The handle 811 drives the worm gear 809 to rotate through the connecting shaft 810. The worm gear 808 meshing with the worm 809 rotates accordingly, which in turn drives the bidirectional lead screw 803 to rotate within the component cavity 802. When the bidirectional lead screw 803 rotates, the two moving blocks 804 connected by its outer threads move relative to each other under the guidance of the guide groove 806, causing the two clamping plates 805 to move closer to the sample and stably clamp the sample. Due to the self-locking property of the worm gear 808 and worm 809, the clamping plates 805 can maintain a stable clamping state. Afterwards, the sealing cover 11 is closed to seal the test chamber 1. The low-temperature test parameters of the test chamber are set by the controller 4. If a specific liquid environment is required for the test, liquid can be injected into the placement cavity 2 through the water injection pipe 10. During the test, the staff can directly observe the state changes of the concrete sample in the placement cavity 2 through the observation glass 3 inside the test chamber 1 without removing the sample.

Claims

1. A low-temperature test chamber for testing concrete samples, comprising a test chamber body (1), characterized in that: The test chamber (1) has a placement cavity (2) inside. An observation glass (3) is fixedly installed on the inner side of the test chamber (1). A controller (4) is fixedly installed on the outer side of the test chamber (1). Two symmetrical supports (5) are placed inside the placement cavity (2). Multiple equally spaced partition rods (6) are fixedly connected between the two supports (5). A track groove (7) is opened on the outer side of each partition rod (6). A clamping assembly (8) is provided between each two adjacent partition rods (6). The clamping assembly (8) includes a movable frame (801) slidably connected to the inner side of the track groove (7). A component cavity (802) is opened on the inner side of the movable frame (801). A bidirectional lead screw (803) is rotatably connected to the inner side of the component cavity (802). Two symmetrical moving blocks (804) are threadedly connected to the outer side of the bidirectional lead screw (803). A clamping plate (805) is fixedly connected to the outer side of each of the two moving blocks (804).

2. The low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: The number of track grooves (7) in each of the two side dividers (6) is one, and the two track grooves (7) are symmetrically arranged. The number of track grooves (7) in each of the middle dividers (6) is two, and the two track grooves (7) are symmetrically arranged.

3. The low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: The outer side of the movable frame (801) is provided with a guide groove (806), and the inner wall of the guide groove (806) is connected to the inner wall of the component cavity (802). The outer sides of the two movable blocks (804) are slidably connected to the inner side of the guide groove (806).

4. The low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: The inner sides of both clamping plates (805) are rotatably connected to a plurality of equally spaced pulleys (807).

5. The low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: A worm gear (808) is fixedly connected to the outer side of the bidirectional lead screw (803), and a worm (809) is rotatably connected to the inner side of the component cavity (802). The worm gear (808) and the worm (809) mesh with each other.

6. The low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: The inner side of the movable frame (801) is rotatably connected to a connecting shaft (810), and one end of the connecting shaft (810) is fixedly connected to one end of the worm (809). The other end of the connecting shaft (810) is fixedly connected to a handle (811), and the outer side of the handle (811) is provided with anti-slip texture.

7. A low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: Two symmetrical fastening bolts (812) are installed on the outside of the movable frame (801), and the movable frame (801) and the partition rod (6) are fixedly connected by the fastening bolts (812).

8. A low-temperature test chamber for testing concrete samples according to claim 1, characterized in that: A drain pipe (9) is installed inside the placement cavity (2), a water injection pipe (10) is fixedly installed inside the placement cavity (2), and a sealing cover (11) is installed on the upper side of the test chamber body (1).

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