A device for detecting the flexural strength of cement

Abstract

The application relates to the technical field of cement breaking resistance detection, and particularly discloses a cement breaking resistance strength detection device, which comprises a test table, test block support columns, bearing cylinders, mounting shafts, clamping plates, power mechanisms, supporting mechanisms and positioning mechanisms. When the cement test block is broken into two pieces, the broken test block drives each bearing cylinder to pour to one end, in the process, the power mechanism drives the clamping plate to clamp and fix the cement test block, so that the cement test block cannot directly fall on the test table after being broken; the supporting mechanism can support the rotating bearing cylinder, so that the bearing cylinder stops after rotating to a fixed position; when the cement test block needs to be taken down, the bearing cylinder is rotated to the initial position, the position of the bearing cylinder is limited by the positioning mechanism, and the cement test block can be conveniently taken down; in the process, the broken cement test block is clamped and fixed, so that the cement test block cannot directly fall on the test table, and the splashing of the debris is reduced as much as possible.

Description

Technical Field

[0001] This application relates to the field of cement flexural strength testing technology, and in particular to a cement flexural strength testing device. Background Technology

[0002] During construction, the flexural strength of the produced cement is usually tested. The flexural strength of cement refers to the maximum stress per unit area of ​​a cement mortar specimen before fracture when subjected to bending load. To test the flexural strength of cement, cement test blocks are prepared in advance and then tested using a cement flexural strength testing device.

[0003] In related technologies, a cement flexural strength testing device includes a test bench and a flexural testing machine mounted on the test bench. The flexural testing machine is equipped with a flexural testing head. Two specimen support columns are installed at intervals on the test bench, with the flexural testing head positioned directly above the middle of the two support columns. When testing the flexural strength of a cement specimen, the two ends of the specimen are first placed on the two support columns. The flexural testing machine is then started, pushing the flexural testing head downwards to press against the upper surface of the cement specimen. When the cement specimen breaks, the flexural testing machine stops working. At this point, the machine records the maximum stress experienced by the cement specimen at fracture, thus determining the flexural strength of the cement specimen.

[0004] Regarding the aforementioned technologies, when a cement test block breaks, it falls from the top of the two test block support columns and then crashes onto the test bench. This causes cement fragments to scatter everywhere, and with the increasing number of tests, it may damage the test bench. Therefore, improvements are needed to address this issue. Summary of the Invention

[0005] To reduce debris splashing during the test and minimize damage to the test bench, this application provides a cement flexural strength testing device.

[0006] This application provides a cement flexural strength testing device, which adopts the following technical solution:

[0007] A cement flexural strength testing device includes a test bench and two sets of test block support columns disposed on the test bench. Each set of test block support columns consists of two test block support columns. The device also includes a support cylinder disposed between the two test block support columns. The support cylinder is open at both ends and at the top. The cement test blocks are placed in the corresponding support cylinders at both ends.

[0008] An installation shaft is fixedly installed between the two test block support columns, and the bottoms of the two support cylinders are rotatably installed on the corresponding installation shaft;

[0009] The test block support column is respectively equipped with: a clamping plate, which is disposed inside the support cylinder and is used to clamp and fix the cement test block tilting to one end after the cement test block breaks; a power mechanism, which drives the clamping plate to clamp and fix the cement test block through the tilting support cylinder; a support mechanism, which is used to support and fix the tilting support cylinder; and a positioning mechanism, which is used to position and fix the corresponding position of the support cylinder when the test block breaks into two pieces and rotates the support cylinder to the initial position.

[0010] By adopting the above technical solution, when the flexural test head of the flexural test machine breaks the cement block, the cement block breaks into two pieces, and the broken cement blocks respectively drive each support cylinder to tilt to one end.

[0011] In this application, since the indenter in the flexural test is pressed against the middle of the cement specimen, the fracture location will also be near the middle of the cement specimen.

[0012] Therefore, the two broken cement test blocks will respectively drive the two support cylinders to tilt towards the middle position of the two sets of test block support columns. During this process, the power mechanism drives the clamping plate to abut against the side wall of the cement test block, so that the cement test block is pressed against the inner wall of the support cylinder, thereby clamping and fixing the cement test block, so that the two broken cement test blocks will not fall directly onto the test table.

[0013] The support mechanism can support the tipping support cylinder, allowing it to rotate to a fixed position and then stop.

[0014] When it is necessary to remove the cement test block, rotate the support cylinder to the initial position, that is, when the bottom of the support cylinder is parallel to the upper surface of the test bench. At this time, the rotation of the support cylinder can be limited by the positioning mechanism to keep the support cylinder stable. At this time, no additional support is needed for the support cylinder.

[0015] At this point, the power mechanism causes the clamping plate to separate from the side wall of the cement block, and the clamping plate is no longer pressed against the side wall of the cement block. At this point, the cement block can be easily removed from the support cylinder.

[0016] In summary, the cement test block will not fall directly onto the test platform during the test, which greatly reduces the splashing of debris and prevents damage to the test platform, thus improving the cement flexural strength testing device in related technologies.

[0017] Optionally, the power mechanism includes a first gear coaxially fixedly mounted on the mounting shaft, a second gear rotatably mounted on the side wall of the support cylinder, and a moving component for driving the clamping plate to move closer to or away from the cement test block.

[0018] The first gear and the second gear mesh. When the second gear rotates, the second gear drives the clamping plate to move closer to or further away from the cement test block through the moving component.

[0019] By adopting the above technical solution, when the support cylinder tilts, the support cylinder rotates around the mounting shaft. Since the second gear meshes with the first gear, and the first gear is coaxially fixed with the mounting shaft, the second gear will rotate along the tooth surface of the first gear.

[0020] During the rotation of the second gear, the moving component will drive the clamping plate to move closer to the side wall of the cement block, thereby clamping and fixing the broken cement block.

[0021] Optionally, the diameter of the first gear is larger than the diameter of the second gear.

[0022] By adopting the above technical solution, when the first gear moves by the same angle, the second gear rotates by a larger angle, thereby enabling the second gear to drive the clamping plate to move a greater distance, thus achieving a better clamping effect on the cement test block.

[0023] Optionally, the moving component includes a sliding cylinder slidably mounted on the side wall of the support cylinder, a plug rod rotatably mounted on the side wall of the support cylinder and with one end threaded into the sliding cylinder, and a limiting member for restricting the rotation of the sliding cylinder. The end of the sliding cylinder is fixed to the clamping plate, and the end of the plug rod is fixed to the second gear and coincides with the rotation axis.

[0024] By adopting the above technical solution, when the second gear rotates, it will drive the insert rod to rotate. Due to the threaded fit between the insert rod and the sliding cylinder, the rotation of the insert rod can drive the sliding cylinder to move towards the side wall of the cement block, thereby driving the clamping plate to clamp and fix the cement block.

[0025] Optionally, the support mechanism includes a telescopic rod rotatably mounted at one end on the side wall of a test block support column and a slider rotatably connected to the other end of the telescopic rod. An installation groove is provided on the side wall of the support cylinder extending toward the test bench, and the slider is slidably engaged in the installation groove.

[0026] The positioning mechanism is installed on the side wall of the support cylinder and is used to limit and fix the position of the slider when the support cylinder is in a horizontal state.

[0027] By adopting the above technical solution, when the support cylinder tilts to one side, the support cylinder drives the slider to slide along the mounting groove. At this time, the telescopic rod extends and retracts. When it slides to the end of the mounting groove, the telescopic rod and the slider together restrict the rotation of the support cylinder, keeping it stable in a fixed position, thereby achieving support for the support cylinder.

[0028] Optionally, the positioning mechanism includes a third gear rotatably mounted on the side wall of the support cylinder, a first rack slidably mounted on the side wall of the support cylinder and meshing with the second gear and the third gear respectively, a second rack slidably mounted on the side wall of the support cylinder and meshing with the third gear, and a locking assembly for locking the second rack.

[0029] A slot is provided on the side wall of the slider corresponding to the end of the second gear. The opening size of the slot is larger than the end size of the second rack. When the support cylinder is parallel to the upper surface of the test bench, the end of the second rack is inserted into the slot.

[0030] By adopting the above technical solution, when it is necessary to remove the broken cement test block from the support cylinder, the cement test block is pressed and fixed against the inner wall of the support cylinder by the clamping plate, making it difficult to remove the cement test block directly.

[0031] Rotate the support cylinder to a position parallel to the test bench. During this process, the second gear rotates in the opposite direction. The second gear drives the third gear to rotate in the same direction through the first rack. The second rack is inserted into the slot under the drive of the third gear. Then, the locking assembly is used to lock and fix the second rack, thereby fixing the support cylinder in a horizontal position. At this time, it is not necessary to support the support cylinder, and the cement test block can be taken out from the support cylinder.

[0032] When the flexural strength of the cement test block needs to be tested again, place both ends of the cement test block into the corresponding support cylinders and unlock the locking components.

[0033] Optionally, the locking assembly includes a mounting base and a fixing base disposed on the support cylinder and located on both sides of the second rack, and a rotating rod rotatably mounted on the mounting base. One end of the rotating rod is rotatably mounted on the mounting base, and the other end is rotatably fixed on the fixing base.

[0034] The second rack is provided with a slot, and when the end of the rotating rod is fixed to the fixed base, the rod body of the rotating rod is engaged in the slot.

[0035] By adopting the above technical solution, when it is necessary to lock the insertion of the second rack, rotate the rotating rod to fix the movable end of the rotating rod on the fixed seat. At this time, the rod body is engaged in the slot. When it is necessary to unlock the second rack, rotate the rotating rod to separate the movable end of the rotating rod from the fixed seat. At this time, the rod body is separated from the slot, thus unlocking the second rack and allowing the next test to be performed.

[0036] Optionally, a buffer assembly for cushioning the sliding of the slider is installed in the mounting slot.

[0037] By adopting the above technical solution, the buffer component can buffer the sliding movement, thereby cushioning the support cylinder during the tilting process and reducing the possibility of damage to the support mechanism when the support cylinder tilts directly.

[0038] Optionally, the buffer assembly includes two buffer rods whose ends are slidably inserted into each other, and a buffer member sleeved outside the two buffer rods. Both buffer rods are disposed in the mounting groove, with one end abutting against the side wall of the slider and the other end abutting against the inner side wall of the mounting groove.

[0039] By adopting the above technical solution, when the support cylinder tilts to one side, the slider will slide along the mounting groove. The sliding will press against the buffer rod, causing the buffer rod and the buffer rod to deform, thereby buffering the slider and thus buffering the support cylinder when it tilts.

[0040] Optionally, both buffer rods may have buffer pads placed at their ends.

[0041] By adopting the above technical solution, the buffer pad can further buffer the movement of the slider, thereby buffering the tipping of the support cylinder.

[0042] In summary, this application includes at least one of the following beneficial technical effects:

[0043] 1. When the cement test block breaks into two pieces, the broken test blocks will cause each supporting cylinder to tilt to one end. During this process, the power mechanism will drive the clamping plate to clamp and fix the cement test block, so that the cement test block will not fall directly onto the test table after it breaks.

[0044] 2. The support mechanism can support the rotating support cylinder, so that the support cylinder stops rotating after reaching a fixed position;

[0045] 3. When it is necessary to remove the cement test block, rotate the support cylinder to the initial position. The position of the support cylinder will be limited by the positioning mechanism, and the cement test block can then be easily removed. Attached Figure Description

[0046] Figure 1This is a schematic diagram of the overall structure of a cement flexural strength testing device according to an embodiment of this application.

[0047] Figure 2 yes Figure 1 A cross-sectional view of the central support cylinder.

[0048] Figure 3 yes Figure 1 Enlarged view of point A in the middle.

[0049] Reference numerals: 1. Test bench; 11. Flexural testing machine; 111. Flexural testing indenter; 2. Specimen support column; 3. Support cylinder; 31. Support rod; 32. Mounting groove; 4. Mounting shaft; 5. Clamping plate; 6. Power mechanism; 61. First gear; 62. Second gear; 63. Moving component; 631. Sliding cylinder; 632. Insert rod; 7. Support mechanism; 71. Telescopic rod; 72. Slider; 721. Slot; 8. Buffer component; 81. Buffer rod; 82. Buffer element; 9. Positioning mechanism; 91. Third gear; 92. First rack; 93. Second rack; 931. Slot; 94. Locking component; 941. Mounting seat; 942. Fixed seat; 943. Rotating rod. Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail below.

[0051] This application discloses a cement flexural strength testing device.

[0052] A cement flexural strength testing device, such as Figure 1 As shown, it includes a test bench 1, a flexural testing machine 11 set on the test bench 1, two sets of test block support columns 2 set on the test bench 1, and a support cylinder 3 rotatably installed on each set of test block support columns 2. The two ends of the cement test block are respectively supported and placed in the two support cylinders 3.

[0053] like Figure 1 As shown, the support cylinder 3 has open ends and an open top. A support rod 31 with a semi-circular cross-section is welded and fixed to the inner bottom wall of the support cylinder 3. The bottom of the cement specimen rests on the two support rods 31. The two support rods 31 can suspend the cement specimen, ensuring that the bottom of the cement specimen is in line contact with the arc-shaped upper surface of the support rod 31, thus reducing the influence of the support cylinder 3 on the cement specimen during the test.

[0054] The flexural test head 111 on the flexural testing machine 11 is located directly above the center of the cement specimen. During the test, the flexural testing machine 11 can drive the flexural test head 111 to press down, thereby pressing the cement specimen and testing the flexural strength of the cement.

[0055] Before the cement block breaks, the two support cylinders 3 support the cement block together, so that the cement block can remain stable during the test. When the cement block breaks, since the pressing position is in the middle of the cement block, the break is usually located near the middle of the cement block. At this time, the end closer to the middle of the cement block is heavier than the end farther away from the middle of the cement block. Under the action of gravity, the heavier end causes the support cylinder 3 to tilt to one side.

[0056] like Figure 1 As shown, a set of test block support columns 2 consists of two test block support columns 2, which are fixed at intervals on the test bench 1. In this embodiment, the bottom of the test block support column 2 is installed and fixed by bolts. In other embodiments, welding can also be used for fixing.

[0057] An installation shaft 4 is fixedly installed between the two test block support columns 2. The two ends of the installation shaft 4 are inserted and fixed to the top of the two test block support columns 2. In other feasible embodiments, the installation shaft 4 can also be fixed by welding. The bottom of the two support cylinders 3 is rotatably installed on the corresponding installation shaft 4 so that the support cylinder 3 can rotate around the installation shaft 4 when it tilts to one side.

[0058] During the tilting process of the support cylinder 3, cement test blocks will fall out of the support cylinder 3 and crash onto the test bench 1. This will not only damage the test bench 1 but also cause debris to fly everywhere, affecting the experimental environment and potentially injuring the experimental operator. Therefore, this invention addresses this issue by minimizing the impact of broken cement test blocks on the experimental process.

[0059] Therefore, clamping plates 5 for holding cement test blocks and power mechanisms 6 for moving clamping plates 5 toward or away from the side wall of cement test blocks are respectively provided on the test block support column 2.

[0060] like Figure 1 and Figure 2 As shown, the power mechanism 6 includes a first gear 61, a second gear 62, and a moving component 63. The first gear 61 is coaxially sleeved and fixed on the mounting shaft 4, and the second gear 62 is rotatably mounted on the side wall of the support cylinder 3. The first gear 61 and the second gear 62 mesh, and the diameter of the first gear 61 is larger than the diameter of the second gear 62.

[0061] In this embodiment, the diameter ratio of the first gear 61 to the second gear 62 is 1:2. In other embodiments, this ratio may be 1:3 or 1:4, etc. Since the diameter of the first gear 61 is larger than that of the second gear 62, the second gear 62 will rotate at a larger angle when it rotates around the first gear 61. This allows the second gear 62 to move the clamping plate 5 a greater distance via the moving component 63, thereby achieving a better clamping effect on the cement test block.

[0062] like Figure 2 As shown, the moving component 63 includes a sliding cylinder 631, an insert rod 632, and a limiting member 633. The sliding cylinder 631 is slidably mounted on the side wall of the support cylinder 3, and the end of the sliding cylinder 631 is fixed to the clamping plate 5. The insert rod 632 is rotatably mounted on the side wall of the support cylinder 3, and one end is threaded into the sliding cylinder 631, while the other end is fixed to the tooth surface of the second gear 62. The length direction of the insert rod 632 coincides with the rotation axis of the second gear 62.

[0063] The limiting component 633 is a limiting strip. A limiting groove is opened along the inner edge of the support cylinder 3 perpendicular to the side wall of the support cylinder 3. The limiting strip is slidably engaged in the corresponding limiting groove. The limiting strip can cooperate with the limiting groove to limit the rotation of the sliding cylinder 631.

[0064] During the tilting process of the support cylinder 3, the second gear 62 rotates, which drives the insertion rod 632 to rotate, causing the insertion rod 632 to move the sliding cylinder 631. This causes the sliding cylinder 631 to move the clamping plate 5 towards the side wall of the cement block, thereby pressing the cement block against one side wall of the support cylinder 3 and fixing the cement block.

[0065] During the tilting process of the support cylinder 3, in order to support the support cylinder 3, a support mechanism 7 is also provided on the test block support column 2 for support.

[0066] Reference Figure 3 The support mechanism 7 includes a telescopic rod 71 and a slider 72. The telescopic rod 71 is a single-stage telescopic rod 71 that is slidably inserted into each other. In other feasible embodiments, the telescopic rod 71 can also be configured as a two-stage telescopic rod 71 or a multi-stage telescopic rod 71, etc. The side wall of the support cylinder 3 is provided with an installation groove 32 extending in the direction toward the test bench 1, and the slider 72 is slidably engaged and installed in the installation groove 32.

[0067] One end of the telescopic rod 71 is hinged to the side wall of a test block support column 2, and the other end is rotatably mounted on one surface of the slider 72. When the support cylinder 3 tilts, the slider 72 will slide along the mounting groove 32. When the slider 72 slides to the end of the mounting groove 32, the slider 72 and the telescopic rod 71 will jointly limit the tilting of the support cylinder 3, making it difficult for the support cylinder 3 to continue to tilt.

[0068] In order to reduce the buffering effect when the support cylinder 3 tilts, a buffer assembly 8 is installed in the mounting groove 32 to buffer the sliding of the slider 72.

[0069] like Figure 3As shown, the buffer assembly 8 includes two buffer rods 81 whose ends are slidably inserted into each other, and a buffer element 82 sleeved on the two buffer rods 81. Both buffer rods 81 are installed in the mounting groove 32, with one end abutting against the side wall of the slider 72 and the other end abutting against the inner side wall of the mounting groove 32. Buffer pads are provided at the ends of both buffer rods 81. The buffer element 82 is a spring. In other feasible embodiments, the buffer element 82 can also be set as other elastic elements that can achieve buffering.

[0070] When the support cylinder 3 tilts to a fixed angle, the clamping plate 5 is pressed against and fixed on the side wall of the cement test block. At the same time, the slider 72, together with the buffer assembly 8, achieves the limiting and fixing of the support cylinder 3. At this time, the broken cement test block needs to be removed.

[0071] The clamping plate 5 is still pressed against the side wall of the cement test block. Therefore, the support cylinder 3 is manually rotated to make the support cylinder 3 rotate to a position that is horizontal with the test bench 1. At this time, in order to facilitate the removal of the cement test block, a positioning mechanism 9 is also provided on the test block support column 2 to limit and fix the position of the support cylinder 3.

[0072] The positioning mechanism 9 is installed on the side wall of the support cylinder 3. When the support cylinder 3 is in a horizontal state, it is used to limit and fix the position of the slider 72.

[0073] like Figure 2 and Figure 3 As shown, the positioning mechanism 9 includes a third gear 91, a first rack 92, a second rack 93, and a locking assembly 94. The second rack 93 is rotatably mounted on the side wall of the support cylinder 3. The first rack 92 is slidably mounted on the side wall of the support cylinder 3 and meshes with the second gear 92 and the third gear 91 respectively. The second rack 93 is slidably mounted on the side wall of the support cylinder 3 and meshes with the third gear 91. The locking assembly 94 can lock the second rack 93.

[0074] A slot 721 is provided on the side wall of the slider 72 corresponding to the end of the second gear 62. It is worth noting that the opening size of the slot 721 is larger than the end size of the second rack 93. When the support cylinder 3 is parallel to the upper surface of the test bench 1, the end of the second rack 93 is inserted into the slot 721.

[0075] Reference Figure 3 The locking assembly 94 includes a mounting base 941, a fixing base 942, and a rotating rod 943. The mounting base 941 and the fixing base 942 are both fixed on the side wall of the support cylinder 3 and are located on both sides of the second rack 93 respectively. The rotating rod 943 is rotatably mounted on the mounting base 941, and one end of the rotating rod 943 is rotatably mounted on the mounting base 941, while the other end can be rotatably fixed on the fixing base 942.

[0076] A slot 931 is provided on the second rack 93 for the rotating rod 943 to engage. When the end of the rotating rod 943 rotates and is fixed on the fixed base 942, the rod body of the rotating rod 943 engages in the slot 931. At this time, the rotating rod 943 limits and fixes the position of the second rack 93, thereby fixing the position of the second rack 93 on the slider 72, and fixing the position of the support cylinder 3. At this time, the support cylinder 3 is fixed in a horizontal position, and the cement test block can be directly removed. When the next test is required, the rotating rod 943 is moved so that it is no longer engaged in the slot 931.

[0077] The implementation principle of the cement flexural strength testing device in this application embodiment is as follows: the cement test block is placed in two support cylinders 3, so that the two support rods 31 support the two ends of the cement test block.

[0078] Rotate the rotating rod 943 to remove it from the slot 931, and then start the flexural testing machine 11. Driven by the flexural testing machine 11, the flexural testing head 111 presses the upper surface of the cement block. During the pressing process, the flexural testing machine 11 can collect and record the force fed back from the flexural testing head 111.

[0079] When the flexural test indenter 111 breaks the cement test block, the cement test block will cause the support cylinder 3 to tilt to one side. At this time, the second gear 62 will rotate around the first gear 61. The second gear 62 will drive the first rack 92 to move closer to the mounting groove 32. The first rack 92 will drive the third gear 91 to rotate. The third gear 91 will drive the second rack 93 to move away from the mounting groove 32. At this time, the end of the second rack 93 will move out of the slot 721, and the slider 72 will be in an active state.

[0080] During the tilting process of the support cylinder 3, the slider 72 will slide along the mounting groove 32. During this process, the buffer component 8 will buffer the movement of the slider 72, so that the support cylinder 3 remains stable after tilting to a certain extent. At this time, the broken cement test block needs to be removed.

[0081] The support cylinder 3 is quickly rotated to a horizontal position. During the rotation, the end of the second rack 93 is inserted into the slot 721 under the drive of the second gear 62, the first rack 92 and the third gear 91.

[0082] Rotate the rotating rod 943 to fix one end of the rotating rod 943 to the fixed base 942, so that the rod body of the rotating rod 943 is engaged in the slot 931, thereby limiting the second rack 93 and limiting the sliding of the slider 72, so that the support cylinder 3 can be fixed in a horizontal state; at the same time, the clamping plate 5 is also separated from the side wall of the cement block under the drive of the second gear 62, and the cement block can be taken out at this time.

[0083] To conduct the next test, simply repeat the above steps.

[0084] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting the flexural strength of cement, a test bench (1) and two groups of test block support columns (2) arranged on the test bench (1), one group of the test block support columns (2) being composed of two test block support columns (2), characterized in that: It also includes the support cylinder (3) arranged between the two test block support columns (2), both ends and the upper part of the support cylinder (3) are provided with openings, and the two ends of the cement test block are placed in the corresponding support cylinder (3). The two test block support columns (2) are fixedly installed with mounting shafts (4), and the bottoms of the two support cylinders (3) are rotatably installed on the corresponding mounting shafts (4). The test block support column (2) is respectively provided with: The clamping plate (5) is arranged in the support cylinder (3), and is used for clamping and fixing the cement test block poured at one end after the cement test block is broken. The power mechanism (6) drives the clamping plate (5) to clamp and fix the cement test block through the poured support cylinder (3). The support mechanism (7) is used for supporting and fixing the poured support cylinder (3). The positioning mechanism (9) is used for positioning and fixing the position of the corresponding support cylinder (3) when the test block is broken into two pieces. The power mechanism (6) includes a first gear (61) coaxially and fixedly installed on the mounting shaft (4), a second gear (62) rotatably installed on the side wall of the support cylinder (3), and a moving assembly (63) for driving the clamping plate (5) to move close to or away from the cement test block. The first gear (61) and the second gear (62) are engaged, and when the second gear (62) rotates, the second gear (62) drives the clamping plate (5) to move towards or away from the cement test block through the moving assembly (63). The support mechanism (7) includes a telescopic rod (71) rotatably installed at one end on the side wall of one test block support column (2), and a sliding block (72) rotatably connected with the other end of the telescopic rod (71), and the side wall of the support cylinder (3) is provided with an installation groove (32) extending in the direction towards the test bench (1), and the sliding block (72) is slidingly connected and installed in the installation groove (32). The positioning mechanism (9) is installed on the side wall of the support cylinder (3), and is used for limiting and fixing the position of the sliding block (72) when the support cylinder (3) is in a horizontal state. The positioning mechanism (9) includes a third gear (91) rotatably installed on the side wall of the support cylinder (3), a first rack (92) slidingly installed on the side wall of the support cylinder (3) and engaged with the second gear (62) and the third gear (91), respectively, a second rack (93) slidingly installed on the side wall of the support cylinder (3) and engaged with the third gear (91), and a locking assembly (94) for locking the second rack (93). The side wall of the sliding block (72) is provided with an insertion slot (721) corresponding to the end of the second gear (62), and the opening size of the insertion slot (721) is greater than the size of the end of the second rack (93), and when the support cylinder (3) is parallel to the upper surface of the test bench (1), the end of the second rack (93) is inserted into the insertion slot (721).

2. The device for detecting the flexural strength of cement according to claim 1, wherein: The diameter of the first gear (61) is greater than the diameter of the second gear (62).

3. The apparatus for detecting the flexural strength of cement according to claim 1, wherein: The moving assembly (63) comprises a sliding cylinder (631) slidingly mounted on the sidewall of the supporting cylinder (3), a inserting rod (632) rotatably mounted on the sidewall of the supporting cylinder (3) and threadedly inserted into the sliding cylinder (631) at one end, and a limiting piece (633) for limiting the rotation of the sliding cylinder (631), the end of the sliding cylinder (631) is fixed with the clamping plate (5), and the end of the inserting rod (632) is fixed on the second gear (62) and coincides with the rotation axis.

4. The device for detecting the flexural strength of cement according to claim 1, wherein: The locking assembly (94) comprises a mounting seat (941) arranged on the supporting cylinder (3) and located on both sides of the second rack (93), a fixed seat (942), and a rotating rod (943) rotatably mounted on the mounting seat (941), one end of the rotating rod (943) is rotatably mounted on the mounting seat (941), and the other end is rotatably fixed on the fixed seat (942). The second rack (93) is provided with a clamping groove (931), and when the end of the rotating rod (943) is fixed on the fixed seat (942), the rod body of the rotating rod (943) is clamped in the clamping groove (931).

5. The device for detecting the flexural strength of cement according to claim 1, wherein: The mounting groove (32) is provided with a buffer assembly (8) for buffering the sliding of the sliding block (72).

6. The apparatus for detecting the flexural strength of cement according to claim 5, wherein: The buffer assembly (8) comprises two buffer rods (81) with their ends slidingly inserted into each other, a buffer piece (82) sleeved on the two buffer rods (81), the two buffer rods (81) are arranged in the mounting groove (32) and abut against the sidewall of the sliding block (72) at one end and the inner sidewall of the mounting groove (32) at the other end.

7. The apparatus for detecting the flexural strength of cement according to claim 6, wherein: The ends of the two buffer rods (81) are each provided with a buffer gasket.

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