A kind of brick block test piece automatic freeze-thaw test device

Abstract

The application discloses a kind of brick tile block test piece automatic freeze-thaw test device of building material freeze-thaw test technical field, including the freezing cabinet with refrigeration source, the inside of freezing cabinet is provided with test piece storage component, test piece storage component includes bottomless and coverless box, support spring for supporting brick tile test piece in the inside of box.The height of each brick tile is recorded by setting spring to support brick tile test piece and setting height memory component, so that multiple brick tile test pieces do not need to be weighed one by one before and after test, only need to accurately calculate the brick tile test piece with obvious mass loss after freeze-thaw test is finished, the exact mass loss rate can be obtained, the process of needing to be numbered and weighed and recorded for test piece before and after test is removed, and there is no need to weigh and calculate one by one after freeze-thaw test is finished, the efficiency of freeze-thaw test is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of freeze-thaw testing technology for building materials, specifically to an automatic freeze-thaw testing device for brick and tile block specimens. Background Technology

[0002] With the development of the construction industry, people have increasingly stringent requirements for building quality. The quality of brick and tile blocks is a key factor in building quality. To test the frost resistance of brick and tile blocks, specimens are often selected for freeze-thaw testing. During freeze-thaw testing, a freeze-thaw testing machine is typically used to simulate the external natural environment. The number of rapid freeze-thaw cycles endured by the brick and tile block specimen under water-freezing and water-thawing conditions is used to represent the frost resistance of the brick and tile block. The freeze-thaw test procedure for bricks is as follows:

[0003] a. Clean the surface with a brush and number the samples sequentially. Place the samples in a forced-air drying oven and dry them at 105-1100°C until constant weight. Weigh them and inspect their appearance, marking any chipped edges, cracks, or other defects.

[0004] b. Immerse the sample in water at 10-200°C for 24 hours, then remove it, wipe off the surface moisture with a damp cloth, and place it upright with the larger side facing up in a freezer that has been pre-cooled to below -150°C with a spacing of more than 20 mm.

[0005] c. Start timing when the temperature inside the chamber drops to -15°C again, and freeze at -15 to -20°C for 3 hours. Then remove it and thaw it in water at 10-20°C for at least 2 hours. This completes one freeze-thaw cycle.

[0006] d. Every 5 freeze-thaw cycles, check for damage that occurred during the freeze-thaw process, such as cracks, chipped edges, broken corners, and peeling.

[0007] e. If, during the freeze-thaw process, the damage to the sample exceeds the appearance specifications, the test should continue until 15 freeze-thaw cycles are completed.

[0008] f. After 15 freeze-thaw cycles, the sample is placed in a forced-air drying oven, dried, and weighed. The mass loss rate is calculated. If the appearance is obviously cracked or the mass loss rate is greater than 2%, it is considered unqualified.

[0009] In the mass weighing process, due to the large number of specimens, each specimen needs to be numbered and weighed, and the mass before freeze-thaw is recorded. Then, the mass after freeze-thaw is recorded again, and the mass loss rate needs to be calculated for each specimen. The workload is large, resulting in low efficiency of freeze-thaw tests. Summary of the Invention

[0010] The purpose of this invention is to provide an automatic freeze-thaw test device for brick and tile block specimens to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an automatic freeze-thaw test device for brick and tile block specimens, comprising a freezer box with a freezing source, wherein a specimen storage assembly is provided inside the freezer box, and the specimen storage assembly comprises a bottomless and lidless box body and a support spring disposed inside the box body for supporting the brick and tile specimens;

[0012] The specimen storage component is provided with a cover frame component at its top. The cover frame component includes a square frame and a crossbeam disposed inside the square frame. The surface of the crossbeam is provided with a height memory component for recording the height of the brick and tile specimens. The height memory component includes a sliding frame with vertical freedom disposed on the surface of the crossbeam. The square frame and the inside of the crossbeam are provided with a fixing component for fixing the sliding frame.

[0013] A further improvement is that the freeze-thaw test device also includes a water tank and an antifreeze tank. Both the water tank and the antifreeze tank are connected to the freezer via pipes, and a bidirectional pump is installed in the middle section of the pipes. The water tank and the antifreeze tank are standard features in freeze-thaw tests. The antifreeze is used for freezing, and the water tank is used to provide water at 10-20°C for thawing.

[0014] A further improvement is that the inner wall of the freezer is provided with a flange for supporting the suspension of the freezer body, the side surface of the freezer body is provided with a protrusion corresponding to the flange, and the outer surface of the freezer body near the upper end is provided with a lifting lug for easy removal of the freezer body, making it convenient for the freezer body to enter and exit the freezer.

[0015] A further improvement is that the inner wall of the box near the upper end is provided with a mesh-distributed limiting frame for limiting the brick and tile specimens through a connector. The limiting frame is used to support the upper end of the brick and tile specimens and prevent them from tipping over.

[0016] A further improvement is that the inner wall of the box near the bottom is provided with cylinders corresponding to the limiting frames through connectors. A sliding rod is slidably connected inside the cylinder, and a tray for supporting the brick and tile specimens is provided at the top of the sliding rod. The support spring is provided between the tray and the cylinder. The brick and tile specimens are supported by the elastic force of the spring, so that when the mass of the brick and tile specimens changes, their height also changes, which makes it easier to observe and determine which brick and tile specimens need further testing.

[0017] A further improvement is that the lower edge of the frame is provided with a locking plate for engaging with the box body, which facilitates the positioning of the frame.

[0018] A further improvement is that the surface of the crossbeam is provided with a limiting member to restrict the lateral sliding of the sliding frame, so that the sliding frame can be aligned with the brick and tile specimen, facilitating height memorization.

[0019] A further improvement is that the fixing component includes a long rod slidably disposed inside the crossbeam. The side surface of the crossbeam has a side groove, and a locking rod is rotatably disposed inside the side groove. The surface of the long rod has a protruding rod that pushes the locking rod to rotate. One side of the frame has an inner cavity, and the inner cavity has a threaded rod and a hinge rod for connecting the long rod and the threaded rod. The end of the inner cavity has a threaded groove corresponding to the threaded rod. By setting the fixing component, all sliding frames can be fixed, which facilitates the recording of the initial height of the brick and tile specimens.

[0020] A further improvement is that the side surface of the sliding frame is provided with a side edge, and an observation rod is slidably mounted on the surface of the side edge. The side surface of the observation rod is provided with an upper limit block that contacts the upper end of the side edge, and the bottom end of the observation rod is also provided with a lower limit block. A small spring is provided between the lower limit block and the side edge. The small spring can facilitate observation. When the mass loss rate of the brick and tile specimen is close to 2%, the small spring is lifted by the support spring, which drives the observation rod to move upward, making it easier to observe and judge.

[0021] A further improvement is that the top of the observation rod is flush with the top of the sliding frame. The initial flush state makes it easy to distinguish when the observation rod changes height.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This technical solution uses spring-supported brick and tile specimens and a height memory component to record the height of each brick and tile. This eliminates the need to weigh each specimen individually before and after the test. Only after the freeze-thaw test is completed does the exact mass loss rate of the specimen with significant mass loss need to be calculated. This eliminates the need to number, weigh, and record each specimen before and after the test, and also eliminates the need for individual weighing and calculation after the freeze-thaw test, greatly improving the efficiency of the freeze-thaw test. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an automatic freeze-thaw test device for brick and tile block specimens according to the present invention;

[0025] Figure 2 This invention relates to an automatic freeze-thaw test device for brick and tile block specimens. Figure 1 Enlarged view of the structure of section A in the middle;

[0026] Figure 3 This invention relates to an automatic freeze-thaw test device for brick and tile block specimens. Figure 1 Enlarged view of the structure of section B;

[0027] Figure 4 This is a top view of the cover frame assembly of an automatic freeze-thaw test device for brick and tile block specimens according to the present invention;

[0028] Figure 5 This invention relates to an automatic freeze-thaw test device for brick and tile block specimens. Figure 4 Schematic diagram of the structure of part C;

[0029] Figure 6 This is a top view of the box structure of an automatic freeze-thaw test device for brick and tile block specimens according to the present invention;

[0030] Figure 7 This invention relates to an automatic freeze-thaw test device for brick and tile block specimens. Figure 5 Schematic diagram of part D in the middle.

[0031] In the diagram: 1. Freeze-thaw assembly; 11. Freezer; 12. Water tank; 13. Antifreeze tank; 14. Flange; 2. Specimen storage assembly; 21. Box body; 22. Limiting frame; 23. Cylinder; 24. Sliding rod; 25. Support spring; 26. Tray; 27. Protrusion; 28. Lifting lug; 3. Cover frame assembly; 31. Square frame; 32. Clamping plate; 33. Crossbeam; 34. Threaded rod; 35. Threaded groove; 36. Hinge rod; 37. Inner cavity; 38. Long rod; 39. Side groove; 310. Clamping rod; 311. Protrusion; 312. Limiting component; 4. Height memory assembly; 41. Sliding frame; 42. Observation rod; 43. Small spring; 44. Upper limit block; 45. Lower limit block; 5. Brick and tile specimen. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] An automatic freeze-thaw test device for brick and tile block specimens includes a freeze-thaw assembly 1. The freeze-thaw assembly 1 includes a freezer chamber 11 with a freezing source, a water tank 12, and an antifreeze tank 13. The water tank 12 and the antifreeze tank 13 are connected to the freezer chamber 11 through pipes, and a bidirectional pump is installed in the middle section of the pipes. The freezer chamber 11 is equipped with a specimen storage assembly 2. The specimen storage assembly 2 includes a bottomless and lidless box body 21 and a support spring 25 installed inside the box body 21 to support the brick and tile specimens 5.

[0035] Water tanks and antifreeze tanks are standard features in freeze-thaw tests. Antifreeze is used for freezing. When using it, first inject antifreeze into the freezer 11, cool it to the specified temperature, and then put the brick and tile specimens 5 in for freezing. When thawing, water at 10-20°C is provided through the water tank 12 for thawing.

[0036] The inner wall of the freezer 11 is provided with a flange 14 for supporting the suspension of the box body 21. The side surface of the box body 21 is provided with a protrusion 27 corresponding to the flange 14, so that space is reserved around the box body 21 to facilitate the full contact between the brick and tile specimen 5 and the freezing liquid. In order to facilitate the entry and exit of the box body 21 from the freezer 11, the outer surface of the box body 21 near the upper end is provided with a lifting lug 28 for easy removal of the box body 21.

[0037] The inner wall of the box 21 near the upper end is provided with a mesh-distributed limiting frame 22 for limiting the brick and tile specimen 5 via a connector. The inner wall of the box 21 near the bottom end is provided with a cylinder 23 corresponding to the limiting frame 22 via a connector. A sliding rod 24 is slidably connected inside the cylinder 23. A tray 26 for supporting the brick and tile specimen 5 is provided at the top of the sliding rod 24. A support spring 25 is provided between the tray 26 and the cylinder 23. By providing a support spring 25 to support the brick and tile specimen 5, the deformation of the support spring 25 increases when the mass of the brick and tile specimen changes, and the height of the brick and tile specimen 5 also changes. This makes it easier to observe and determine whether the brick and tile specimen needs further testing.

[0038] The top of the box 21 is provided with a cover frame assembly 3. The cover frame assembly 3 includes a square frame 31 and a crossbeam 33 disposed inside the square frame 31. The surface of the crossbeam 33 is provided with a height memory assembly 4 for recording the height of the brick and tile specimen 5. The height memory assembly 4 includes a sliding frame 41 with vertical freedom disposed on the surface of the crossbeam 33. The square frame 31 and the crossbeam 33 are provided with a fixing assembly for fixing the sliding frame 41. The lower edge of the square frame 31 is provided with a locking plate 32 for fastening with the box 21. The surface of the crossbeam 33 is provided with a limiting member 312 for restricting the lateral sliding of the sliding frame 41.

[0039] Since the initial mass of each brick and tile specimen is different, and the height of each support spring 25 may vary after multiple uses, the initial height of the brick and tile specimen 5 is not consistent at the start of the freeze-thaw test. Therefore, the present invention records the initial position of the brick and tile specimen 5 by means of a sliding frame 41 that can slide up and down. The sliding frame 41 has a vertical degree of freedom, and the lower limit block 45 at the bottom of the sliding frame 41 falls on the upper surface of the brick and tile specimen 5 to record the initial height of each brick and tile specimen 5.

[0040] The fixing assembly includes a long rod 38 slidably disposed inside the crossbeam 33. A side groove 39 is provided on the side surface of the crossbeam 33. A locking rod 310 is rotatably disposed inside the side groove 39. A protruding rod 311 is provided on the surface of the long rod 38 to push the locking rod 310 to rotate. An inner cavity 37 is provided inside one side of the frame 31. A threaded rod 34 and a hinge rod 36 for connecting the long rod 38 and the threaded rod 34 are provided inside the inner cavity 37. The end of the inner cavity 37 is provided with a threaded groove 35 corresponding to the threaded rod 34.

[0041] The function of the fixing component is to fix the current height of the sliding frame 41, thereby recording the initial height of the brick and tile specimen 5 at that location. The fixing method is to rotate the threaded rod 34 to make the threaded rod 34 slide, and push the long rod 38 to slide through the hinge rod 36. The long rod 38 pushes the locking rod 310 to rotate and support it outward, thus fixing the sliding frame 41.

[0042] The side surface of the sliding frame 41 is provided with a side edge, and an observation rod 42 is slidably provided on the surface of the side edge. The side surface of the observation rod 42 is provided with an upper limit block 44 that contacts the upper end of the side edge. The bottom end of the observation rod 42 is also provided with a lower limit block 45. A small spring 43 is provided between the lower limit block 45 and the side edge. The top end of the observation rod 42 is flush with the top end of the sliding frame 41.

[0043] It should be noted that even if the upper limit block 44 contacts the side edge of the sliding frame 41, the small spring 43 is still in a compressed state. This compressed state allows the elastic force of the small spring 43 to support the sliding frame 41. That is, when the sliding frame 41 falls from a free state above the brick and tile specimen 5, the small spring 43 will not be compressed. Only when the support spring 25 provides a greater upward elastic force will the small spring 43 be compressed, pushing the observation rod 42 to move upward.

[0044] Detailed Implementation: First, the brick and tile specimens 5 are pretreated according to the freeze-thaw test procedure, as described in step ab of the freeze-thaw test in the background art, which will not be repeated here. Then, the brick and tile specimens 5 are placed on the tray 26. After they stabilize, the brick and tile specimens 5 do not contact the limiting frame 22. At this time, the cover frame assembly 3 is closed, and the sliding frames 41 all fall on the upper end of the corresponding brick and tile specimens 5. The threaded rod 34 is rotated to fix the height of the sliding frame 41. The initial height of each brick and tile specimen 5 is recorded. After 15 freeze-thaw cycles, the specimens are lifted from the box 21 and placed in a forced-air drying oven, and the residue is blown out. At this time, the brick and tile specimens 5 lose mass. When the mass loss is close to 2%, the supporting spring 25 has sufficient thrust. Overcoming the elastic force of the small spring 43, the observation rod 42 is pushed upward for easy observation and judgment. When the observation rod 42 rises, a small weight is added to the tray so that the top of the brick and tile specimen is in near-contact with the sliding frame 41. The mass of the weight is the mass loss, and the mass loss rate of the brick and tile specimen is calculated accordingly. In this way, multiple brick and tile specimens do not need to be weighed individually before and after the test. Only the brick and tile specimen 5 with significantly excessive mass loss needs to be accurately calculated after the freeze-thaw test to obtain its exact mass loss rate. This eliminates the need to number, weigh, and record the specimens one by one before and after the test, and there is no need to weigh and calculate them individually after the freeze-thaw test, which greatly improves the efficiency of the freeze-thaw test.

[0045] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic freeze-thaw test device for brick and tile block specimens, comprising a freezer (11) with a freezing source, characterized in that: The freezer (11) is equipped with a specimen storage assembly (2), which includes a bottomless and lidless box (21) and a support spring (25) inside the box (21) for supporting the brick and tile specimens (5). The top of the specimen storage component (2) is provided with a cover frame component (3). The cover frame component (3) includes a square frame (31) and a crossbeam (33) disposed inside the square frame (31). The surface of the crossbeam (33) is provided with a height memory component (4) for recording the height of the brick and tile specimen (5). The height memory component (4) includes a sliding frame (41) with vertical freedom disposed on the surface of the crossbeam (33). The square frame (31) and the crossbeam (33) are provided with fixing components for fixing the sliding frame (41). The fixing assembly includes a long rod (38) slidably disposed inside the crossbeam (33), a side groove (39) is provided on the side surface of the crossbeam (33), a locking rod (310) is rotatably disposed inside the side groove (39), a protruding rod (311) is provided on the surface of the long rod (38) to push the locking rod (310) to rotate, an inner cavity (37) is provided inside one side of the frame (31), a threaded rod (34) and a hinge rod (36) for connecting the long rod (38) and the threaded rod (34) are provided inside the inner cavity (37), wherein the end of the inner cavity (37) is provided with a threaded groove (35) corresponding to the threaded rod (34); The side surface of the sliding frame (41) is provided with a side edge, and an observation rod (42) is slidably provided on the surface of the side edge. The side surface of the observation rod (42) is provided with an upper limit block (44) that contacts the upper end of the side edge. The bottom end of the observation rod (42) is also provided with a lower limit block (45). A small spring (43) is provided between the lower limit block (45) and the side edge. The top of the observation rod (42) is flush with the top of the sliding frame (41); When the observation rod (42) rises, a small weight is added to the tray so that the top of the brick and tile specimen is in near-contact with the sliding frame (41). The mass of the weight is the lost mass, and the mass loss rate of the brick and tile specimen is calculated accordingly.

2. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The freeze-thaw test device also includes a water tank (12) and an antifreeze tank (13). The water tank (12) and the antifreeze tank (13) are connected to the freezer (11) through pipes, and a bidirectional pump is installed in the middle section of the pipes.

3. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The inner wall of the freezer (11) is provided with a flange (14) for supporting the suspension of the box body (21). The side surface of the box body (21) is provided with a protrusion (27) corresponding to the flange (14). The outer surface of the box body (21) near the upper end is provided with a lifting lug (28) for easy removal of the box body (21).

4. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The inner wall of the box (21) near the upper end is provided with a mesh-distributed limiting frame (22) for limiting the brick and tile specimen (5) through a connector.

5. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The inner wall of the box (21) near the bottom is provided with a cylinder (23) corresponding to the limiting frame (22) through a connector. The cylinder (23) is slidably connected to a slide rod (24). The top of the slide rod (24) is provided with a tray (26) for supporting the brick and tile specimen (5). The support spring (25) is provided between the tray (26) and the cylinder (23).

6. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The lower edge of the frame (31) is provided with a locking plate (32) for fastening with the box body (21).

7. The automatic freeze-thaw test device for brick and tile block specimens according to claim 1, characterized in that: The surface of the crossbeam (33) is provided with a limiting member (312) that restricts the lateral sliding of the slide frame (41).

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