Forming device for expansive cement expansion rate test
By setting a limiting structure with limiting protrusions and grooves in the expansion rate test device for expansive cement, the problems of nail heads falling off and tilting during the test are solved, the success rate and efficiency of the test are improved, and the accuracy of the measurement is ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-03-31
AI Technical Summary
In the expansion rate test of expansive cement, the nail head is prone to getting stuck in the round hole of the end plate and detaching from the specimen, resulting in the specimen being unusable. Furthermore, the nail head may become skewed or embedded in the specimen during vibration, affecting the measurement.
Design a molding device for testing the expansion rate of expansive cement. By setting a limiting protrusion in the small hole and a limiting groove on the nail head, the nail head can be stably limited. During disassembly, the end plate can be disassembled along the limiting direction to avoid the nail head blocking the way.
It effectively prevents the nail head from rotating or moving in the small hole, improves the success rate and efficiency of the test, prevents the nail head from being embedded in the specimen, and ensures the accuracy of the measurement.
Smart Images
Figure CN224066444U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of expansion rate testing technology, specifically to a molding device for testing the expansion rate of expansive cement. Background Technology
[0002] Concrete is the building material with the largest usage and widest application range. However, due to the shrinkage that occurs during the hydration process of commonly used ordinary Portland cement, cracks form in concrete during construction, which reduces the waterproofness of the concrete. To avoid cracks and improve the waterproofness of concrete, cement with expansion properties is usually used, or an expansion agent is added to the cement. There are various types of expansive cement and cement expansion agents on the market. The standard JC / T313-2009 "Test Method for Expansive Cement Expansion Rate" is one of the main reference standards for expansive cement on the market.
[0003] When conducting cement expansion rate tests, cement needs to be added to a triple mold for molding. After the specimen reaches a certain hardness, the triple mold needs to be disassembled to remove the specimen. However, at this time, the nail head is fixed in the round hole of the end plate. When demolding, the nail head is easy to get stuck in the round hole of the end plate and detach from the specimen, thus rendering the specimen unusable. Secondly, when molding the specimen, one end of the mold needs to be lifted upward by hand by 30-50 mm and allowed to fall freely, then vibrated 10 times. The other end of the mold is vibrated 10 times using the same operation. The vibration generated during this process can easily disturb the position of the nail head, causing the nail head to be skewed and inconvenient for measurement, or even the nail head to be embedded in the specimen, making measurement impossible. Summary of the Invention
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a molding device for testing the expansion rate of expansive cement, comprising a base, a pair of detachable end plates on the base, a plurality of parallel partitions between the pair of end plates, small holes in the area between adjacent partitions of the end plates, the small holes for connecting nail heads, a limiting protrusion in the small hole, a limiting groove adapted to the limiting protrusion on the nail head, and the end plates being detachable along the limiting direction of the limiting protrusion.
[0005] In the above scheme, the nail head can be limited by the limiting protrusion inserted into the limiting groove, so as to prevent the nail head from rotating or moving in the small hole, thereby preventing the nail head from falling out of the small hole or tilting when the specimen vibrates, and also preventing the nail head from being buried in the specimen, which would make it impossible to measure.
[0006] When the specimen needs to be removed from the end plate after preparation, the end plate can be removed along the limiting direction of the limiting protrusion, so that the nail head is no longer blocked by the end plate. This makes it easy to remove the nail head and the specimen together from the device, avoiding the failure of the specimen due to the nail head falling off the specimen when removing the nail head, thus improving the efficiency and success rate of the test.
[0007] Preferably, the limiting protrusion is disposed at the inner top and / or inner bottom of the small hole.
[0008] In the above scheme, there are two limiting protrusions, which are respectively set at the top and bottom of the small hole. The two limiting protrusions are symmetrically arranged. There are also two limiting grooves on the outer periphery of the nail head, which are symmetrically arranged. The two limiting protrusions provide stronger stability for limiting the nail head. Alternatively, there can be only one limiting protrusion, which is set at the bottom or top of the small hole. A corresponding limiting groove is provided on the nail head. By inserting the limiting protrusion into the limiting groove, the nail head can be limited, preventing the nail head from falling off the specimen or penetrating into the specimen during vibration.
[0009] Preferably, the end plate includes an upper end plate mounted on the base and a lower end plate mounted on the upper end plate. The upper end plate and the lower end plate are provided with a plurality of semi-circular grooves corresponding to each other at their parting surfaces, and each pair of semi-circular grooves cooperates to form the small hole.
[0010] In the above scheme, the upper end plate and the lower end plate can be separated along the parting surface. After the upper end plate and the lower end plate are separated, the nail head is no longer blocked by the upper end plate, which makes it easy to remove the nail head from the lower end plate and avoids the nail head getting stuck in the end plate and falling off the specimen when it is demolded.
[0011] Preferably, the opposite sides of the end plate are provided with a plurality of rectangular slots, and the partition is detachably inserted into the rectangular slots.
[0012] In the above scheme, since the end plate is limited by the screw, when the partition is inserted into the rectangular groove, the end plate can limit the partition by abutting.
[0013] Preferably, there are four partitions, which together with the base and the end plate form a triple mold.
[0014] In the above scheme, four partitions can separate three specimens, thus producing three specimens at once. Five, six or seven partitions can be set as needed, thus producing more specimens at once.
[0015] Preferably, the limiting protrusion is a cylinder, and the limiting groove is a cylindrical groove.
[0016] In the above scheme, the cylinder is only a preferred form of the limiting protrusion. Users can set the limiting protrusion as a polygonal column or an irregular column as needed, and the limiting groove is designed as a polygonal groove or an irregular groove accordingly.
[0017] Preferably, a pair of end plates are symmetrically distributed at both ends of the base.
[0018] Preferably, the end plate is mounted on the base by fasteners.
[0019] Preferably, the fastener includes a plurality of screws mounted on the top surface of the base and a nut abutting against the end plate, wherein the end plate has a connecting hole for connecting the screws.
[0020] In the above solution, the screw is inserted into the connection hole of the end plate. The screw can limit the end plate in the horizontal direction, eliminating the need to use positioning screws to limit the end plate again. At the same time, the screw can position the end plate. The end plate is positioned by simply fitting the connection hole on the end plate onto the screw. There is no need to use other parts to position the end plate, which improves the convenience of end plate installation.
[0021] Since the end plate abuts against the top of the base, it is easy to remove the end plate from the base. The nut allows the end plate to abut against the base, preventing the end plate from falling off the screw during vibration. By abutting the nut against the upper end plate, the upper and lower end plates can be tightly fitted, preventing gaps between the upper and lower end plates, and thus preventing cement from entering the gaps when the specimen is vibrated.
[0022] Compared with the prior art, the beneficial effects of this utility model are: 1. The molding device for the expansion rate test of expansive cement has a limiting protrusion in the small hole and a limiting groove adapted to the limiting protrusion on the nail head. The end plate is detachable along the limiting direction of the limiting protrusion. By inserting the limiting protrusion into the limiting groove, the nail head can be limited, preventing the nail head from rotating or moving in the small hole. This prevents the nail head from falling out of the small hole or tilting when the specimen vibrates, and also prevents the nail head from being buried in the specimen, which would make it impossible to measure.
[0023] 2. The molding device for the expansion rate test of expansive cement can be disassembled along the limiting direction of the limiting protrusion when the specimen needs to be removed from the end plate after the specimen is made. This allows the nail head to no longer be blocked by the end plate, making it easy to remove the nail head and the specimen together from the device. This avoids the specimen being wasted due to the nail head falling off the specimen when disassembling the nail head, thus improving the efficiency and success rate of the test.
[0024] 3. The molding device for the expansion rate test of expansive cement can make the upper and lower end plates fit tightly by abutting the nut against the upper end plate, thus avoiding gaps between the upper and lower end plates and preventing cement from entering the gaps when the specimen is vibrated. Attached Figure Description
[0025] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0026] Figure 2 This utility model Figure 1 A magnified structural diagram of point A in the middle.
[0027] Figure 3 This utility model Figure 1 Schematic diagram of the cross-sectional structure at point BB.
[0028] Figure 4 This is a three-dimensional structural diagram of the lower end plate of this utility model.
[0029] Figure 5 This is a schematic diagram of the structure of the nail head of this utility model.
[0030] In the diagram: 1. Base; 2. End plate; 201. Upper end plate; 202. Lower end plate; 3. Partition; 4. Nail head; 5. Small hole; 6. Screw; 7. Connecting hole; 8. Nut; 9. Semi-circular groove; 10. Rectangular groove; 11. Limiting protrusion; 12. Limiting groove. Detailed Implementation
[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] Please refer to Figures 1 to 5 The molding device for testing the expansion rate of expansive cement in this embodiment includes a base 1, a pair of detachable end plates 2 on the base 1, a plurality of parallel partitions 3 between the pair of end plates 2, small holes 5 in the area between adjacent partitions 3 on the end plates 2, the small holes 5 for connecting nail heads 4, a limiting protrusion 11 in the small hole 5, and a limiting groove 12 adapted to the limiting protrusion 11 on the nail head 4, the end plates 2 are detachable along the limiting direction of the limiting protrusion 11, and the pair of end plates 2 are symmetrically distributed at both ends of the base 1.
[0033] In the above scheme, the nail head 4 can be limited by the limiting protrusion 11 inserted into the limiting groove 12, so as to prevent the nail head 4 from rotating or moving in the small hole 5, thereby preventing the nail head 4 from falling out of the small hole 5 or tilting when the specimen vibrates, and also preventing the nail head 4 from being buried in the specimen, which would make it impossible to measure.
[0034] In the above technical solution, when the specimen is prepared and needs to be removed from the end plate 2, the end plate 2 can be removed along the limiting direction of the limiting protrusion 11, so that the nail head 4 is no longer blocked by the end plate 2, making it convenient to remove the nail head 4 and the specimen together from the device. This avoids the test block being wasted due to the nail head 4 falling off the specimen when it is removed, thus improving the efficiency and success rate of the test.
[0035] The base 1, end plate 2, and partition 3 together form multiple receiving spaces. Cement is poured into the receiving spaces, and after the cement has solidified, a specimen can be obtained.
[0036] Please refer to Figures 3 to 5 In this embodiment, the limiting protrusion 11 is set at the inner top and / or inner bottom of the small hole 5. The depth of one end of the nail head 4 into the end plate 2 is 10mm. There are two limiting protrusions 11, which are respectively set at the top and bottom of the small hole 5. The two limiting protrusions 11 are symmetrically arranged. There are two limiting grooves 12 on the outer periphery of the nail head 4. The two limiting grooves 12 are symmetrically arranged. The two limiting protrusions 11 provide stronger stability for limiting the nail head 4.
[0037] It should be noted that the number of limiting protrusions 11 can also be one, set at the bottom or top of the small hole 5, and a corresponding limiting groove 12 is provided on the nail head 4. By inserting the limiting protrusion 11 into the limiting groove 12, the nail head 4 can be limited, preventing the nail head 4 from falling off the specimen or penetrating into the specimen during vibration.
[0038] Please refer to Figure 1 , Figure 3 and Figure 4 In this embodiment, the end plate 2 includes an upper end plate 201 mounted on the base 1 and a lower end plate 202 mounted on the upper end plate 201. The upper end plate 201 and the lower end plate 202 are provided with a plurality of semi-circular grooves 9 corresponding to each other at the parting surface, and each pair of semi-circular grooves 9 cooperate to form a small hole 5.
[0039] In the above scheme, the upper end plate 201 and the lower end plate 202 can be separated along the parting surface. After the upper end plate 201 and the lower end plate 202 are separated, the nail head 4 is no longer blocked by the upper end plate 201, which makes it easy to remove the nail head 4 from the lower end plate 202 and prevents the nail head 4 from getting stuck in the end plate 2 and falling off the specimen when it is demolded.
[0040] The limiting protrusion 11 is a cylinder, and the limiting groove 12 is a cylindrical groove. The cylinder is only a preferred form of the limiting protrusion 11. Users can set the limiting protrusion 11 as a polygonal column or an irregular column as needed, and the limiting groove 12 is designed as a polygonal groove or an irregular groove accordingly.
[0041] In this embodiment, the end plate 2 has multiple rectangular slots 10 on its opposite sides. The partition 3 is detachably inserted into the rectangular slot 10. Since the end plate 2 is limited by the screw 6, when the partition 3 is inserted into the rectangular slot 10, the end plate 2 can limit the partition 3 by abutting. At the same time, the partition 3 can be further reinforced by setting a positioning pin on the end plate 2.
[0042] There are four partitions 3, which together with the base 1 and the end plate 2 form a triple mold. The two ends of the partitions 3 are screwed onto the end plate 2. The four partitions 3 can separate the three specimens, so that three specimens can be made at one time. Five, six or seven partitions 3 can be set as needed, so that more specimens can be made at one time.
[0043] The two ends of the partition 3 are screwed onto the end plate 2. By screwing the partition 3 onto the end plate 2, the connection strength and stability between the partition 3 and the end plate 2 can be increased, and the partition 3 can be prevented from falling off during vibration.
[0044] Please refer to Figure 1 and Figure 2 In this embodiment, the end plate 2 is mounted on the base 1 by fasteners. The fasteners include a plurality of screws 6 mounted on the top surface of the base 1 and nuts 8 abutting against the end plate 2. The end plate 2 has connecting holes 7 for connecting the screws 6.
[0045] Insert the screw 6 into the connecting hole 7 of the end plate 2. The screw 6 can limit the end plate 2 in the horizontal direction, eliminating the need to use positioning screws to limit the end plate 2 again. At the same time, the screw 6 can position the end plate 2. Simply put the connecting hole 7 on the end plate 2 onto the screw 6 to complete the positioning of the end plate 2. There is no need to use other parts to position the end plate 2, which improves the ease of installation of the end plate 2.
[0046] Since the end plate 2 abuts against the top of the base 1, it is convenient to remove the end plate 2 from the base 1. The nut 8 can keep the end plate 2 abutting against the base 1, preventing the end plate 2 from falling off the screw 6 during vibration. By abutting the nut 8 against the upper end plate 201, the upper end plate 201 and the lower end plate 202 can be tightly fitted, preventing gaps from forming between the upper end plate 201 and the lower end plate 202, thereby preventing cement from entering the gaps when the specimen is vibrated.
[0047] There are four screws 6, which are distributed at the contact points between the top surface of the base 1 and the end plate 2.
[0048] In the above technical solution, the two screws 6 located on the same side can position the two ends of the end plate 2, thereby ensuring the stability of the end plate 2 installation. Three, five, six or other numbers of screws 6 can be set as needed.
[0049] Assembly and disassembly method: When the device needs to be assembled, first place the lower end plate 202 on the base 1, then insert the partition 3 into the rectangular groove 10, align the limiting groove 12 on the nail head 4 with the limiting protrusion 11 and install it, then install the upper end plate 201 on the lower end plate 202, and at the same time, the other limiting protrusion 11 can be inserted into the limiting groove 12, then install the screw 6 on the connecting hole 7 and the base 1, use the screw 6 to position the end plate 2 and the partition 3, and finally thread the nut 8 onto the screw 6 to complete the assembly of the device.
[0050] The specimen molding and demolding process is as follows: Cement is injected into the receiving space. During specimen molding, the device is vibrated. At this time, the nail head 4 is limited by the limiting protrusion 11 on the end plate 2, so that the nail head 4 will not rotate or tilt during vibration, ensuring a good connection between the nail head 4 and the specimen. After the specimen is molded, the nut 8 is unscrewed from the screw 6. First, the upper end plate 201 is removed from the screw 6. Then, the specimen and nail head 4 are removed from the device. At this time, the upper end plate 201 does not obstruct the nail head 4, making it very easy to remove the nail head 4 and avoiding the situation where the nail head 4 gets stuck in the end plate 2 and separates from the specimen.
[0051] 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 molding device for an expansion ratio test of an expansion cement, comprising a base (1), characterized by, The base (1) is provided with a pair of detachable end plates (2), a plurality of parallel partitions (3) are arranged between the pair of end plates (2), the end plate (2) is provided with a small hole (5) between adjacent partitions (3), the small hole (5) is used for connecting a pin head (4), the small hole (5) is provided with a limiting protrusion (11), the pin head (4) is provided with a limiting groove (12) matched with the limiting protrusion (11), and the end plate (2) is detachable along the limiting direction of the limiting protrusion (11).
2. The molding device for expansion ratio test of expansion cement according to claim 1, wherein The limiting protrusion (11) is arranged at the inner top and / or inner bottom of the small hole (5).
3. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The end plate (2) comprises an upper end plate (201) mounted on the base (1) and a lower end plate (202) mounted on the upper end plate (201), and a plurality of semicircular grooves (9) are arranged at the parting surface of the upper end plate (201) and the lower end plate (202) correspondingly, each pair of semicircular grooves (9) cooperates to form the small hole (5).
4. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The opposite sides of the end plate (2) are provided with a plurality of rectangular grooves (10), and the partition (3) is detachably inserted into the rectangular groove (10).
5. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The number of the partition (3) is four, and the partition (3) forms a three-plate mold together with the base (1) and the end plate (2).
6. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The limiting protrusion (11) is a cylinder, and the limiting groove (12) is a cylindrical groove.
7. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The pair of end plates (2) are symmetrically distributed at the two ends of the base (1).
8. The molding device for expansion of cement expansion ratio test according to claim 1, wherein The end plate (2) is mounted on the base (1) by a fastener.
9. The molding device for expansion of cement expansion ratio test according to claim 8, wherein The fastener comprises a plurality of screw rods (6) mounted on the top surface of the base (1) and a nut (8) abutting against the end plate (2), and the end plate (2) is provided with a connecting hole (7) connected with the screw rod (6).