Cement bulk density detection device
By adding a stirring component to the cement volume density detection device, the problems of displacement and dust of funnel and lifting cylinder are solved, more accurate and stable detection data are achieved, labor intensity and dust pollution are reduced, and it is suitable for cement production and construction projects.
Patent Information
- Application Number
- CN202420663085.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-02
AI Technical Summary
In the existing cement bulk density detection methods, the funnel and the lifting cylinder are prone to displacement during the knocking process, resulting in inaccurate detection data. It is easy to lift powder when tapping the discharge port at the lower end of the funnel, increasing the concentration of air dust and polluting the environment. .
Add mixing components on the existing funnel and lifting cylinder, including a mixing rod and a motor, and drive the loose powder in the discharge port through the mixing rod to ensure that the powder falls naturally, and fix the position of the mixing rod through the adjustment rack to avoid the funnel from Lift displacement.
It effectively avoids data inaccurate and dust problems, reduces manpower assistance, improves the stability and consistency of inspection data, shortens inspection time, and reduces dust concentration. It is suitable for cement production enterprises and construction projects.
Smart Images
Figure CN222259053U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of construction engineering, relates to cement performance detection, and specifically is a cement bulk density detection device. Background Art
[0002] With the rapid development of the construction industry, cement and concrete, as important building materials, have become increasingly important in terms of quality. Cement, as an important adhesive material for ordinary concrete, has a quality level that is directly related to the structural safety of construction projects. In order to effectively ensure the overall quality of construction, it is necessary to increase the inspection of cement quality.
[0003] In the process of selecting cement materials, cement performance test data can be used to quickly complete the classification and use of cement materials, avoiding the situation where cement performance does not meet design requirements and affects the quality of the project. Fast and accurate cement performance testing can guide production well and provide sufficient data support for construction personnel on the construction site, which can better ensure the quality of construction. Cement has multiple performance indicators, and cement bulk density is one of the important performance indicators. It is the data required for preparing mortar and concrete using the volumetric method, calculating cement usage, designing cement warehouses, and estimating cement inventory. Cement bulk density refers to the mass of cement per unit volume in its natural state (including voids), expressed in g / cm. 3 It means that according to the requirements of use, the bulk density of cement is divided into bulk density in loose state and bulk density in compact state.
[0004] The principle of the cement bulk density determination method is to fill the cylinder of the bulk density tester with cement powder, and the cement bulk density can be known from the mass of cement powder in the cylinder. At present, the main instrument used for cement bulk density determination is a special funnel. During measurement, the cement powder in the funnel is required to fall freely at a certain height to fill the cylinder, and the mass of cement powder per unit volume in the cylinder in a loose state is measured. This method has two technical requirements: one is that the discharge end of the bottom of the funnel must be on the same center line as the cylinder, and the other is that the cement powder in the funnel must fall naturally into the cylinder. Funnels are generally used to divert liquids. When using them to divert powders, the gravity and friction of the materials will cause the discharge end to form a self-arching phenomenon, blocking the discharge port. In order to ensure the falling of the material, it is necessary to gently tap the discharge port at the lower end of the funnel to help the material fall. However, when knocking, the funnel will be displaced to a certain extent due to external forces, and the discharge end of the funnel and the lifting tube cannot be guaranteed to be on the same center line. At the same time, the self-arched material falls due to external forces, and it no longer falls in a natural and loose state, resulting in inaccurate detection data. Inaccurate data will bring great quality risks to the project when guiding production and construction. In addition, when tapping the discharge port at the lower end of the funnel, it is easy to lift up the cement powder in the funnel, increase the dust concentration in the air, and pollute the air. Utility Model Content
[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a cement bulk density detection device, which adds a stirring assembly on the basis of the existing funnel and riser. On the basis of not modifying the existing device structure, it effectively prevents the funnel and riser from being displaced, avoids the shortcomings of dust, inaccurate data, etc., and has strong applicability.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] The cement bulk density detection device comprises a funnel, a lifting cylinder and a stirring assembly. The bottom of the funnel is provided with a discharge port, the lifting cylinder is arranged below the discharge port and the center line of the lifting cylinder coincides with the center line of the discharge port, so that the powder in the funnel naturally falls into the lifting cylinder through the discharge port. The top of the funnel is provided with a feed port, and the stirring assembly comprises a stirring rod, a motor arranged above the feed port to drive the stirring rod to rotate, and an adjustment frame arranged at one side of the funnel to install the motor. One end of the stirring rod is connected to the motor, and the other end extends into the discharge port at the bottom of the funnel, so that when the stirring rod is driven to rotate by the motor, the powder accumulated in the discharge port is loosened.
[0008] Furthermore, the funnel is fixedly mounted above the lifting cylinder through a supporting frame.
[0009] Furthermore, the adjustment frame includes a vertical pole and a horizontal pole, one end of the horizontal pole is movably connected to the vertical pole, and the other end is fixedly connected to the motor, so that the height of the motor and the stirring rod can be adjusted by sliding the horizontal pole along the axial direction of the vertical pole.
[0010] Furthermore, an annular sleeve is connected to one end of the crossbar, and the sleeve is sleeved on the vertical pole and slidably connected to the vertical pole. A bolt is provided on one side of the sleeve so that when the sleeve slides axially along the vertical pole to a predetermined position, the bolt is tightened to lock and fix it.
[0011] Furthermore, one end of the bolt passes through the side wall of the sliding sleeve and is in close contact with the side wall of the vertical pole.
[0012] Furthermore, the adjustment frame also includes a base, and the upright pole is fixedly mounted on the base.
[0013] Furthermore, the base is arranged in an arc shape, and the arc-shaped inner wall of the base is adapted to the arc-shaped outer wall of the lifting cylinder, and the center line of the base coincides with the center line of the stirring rod, so that when the base is adapted to be arranged on the outside of the lifting cylinder, the stirring rod extends into the discharge port at the bottom of the funnel along the center line of the funnel.
[0014] Furthermore, the stirring rod is a metal strip with spiral protrusions on the circumference.
[0015] Furthermore, the diameter of the stirring rod is set to 2 mm, and the stirring rod is driven by a motor to rotate along the inner wall of the discharge port at a speed of one rotation every 3 seconds.
[0016] The beneficial effects of the utility model are as follows: the cement bulk density detection device provided by the present application adds a stirring assembly on the basis of the existing funnel and riser, and effectively prevents the displacement of the funnel and riser without modifying the structure of the existing device, thus avoiding the shortcomings of dust and inaccurate data. The utility model has strong applicability, and no longer requires strong human assistance during the detection process, which can effectively save labor, reduce the labor intensity of testers, and avoid human interference caused by different testers during operation. The experimental data is more stable and has a certain uniformity and consistency, thereby reducing the discreteness of the bulk density detection results and being closer to the true value. In addition, the time is short and the dust is less, and the utility model has a high promotion value, which is conducive to ensuring the mix ratio of concrete and the quality of construction projects. The utility model is suitable for various cement production enterprises, construction project laboratories and construction industry inspection and testing institutions. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the utility model.
[0018] Figure 2 It is a side view of the stirring assembly of the utility model.
[0019] Figure 3 It is a top view of the stirring assembly of the utility model. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] like Figure 1-3 As shown, the utility model provides a cement bulk density detection device, including a funnel 1, a lifting cylinder 2 and a stirring assembly 3. The funnel 1 has a discharge port 11 at the bottom, the lifting cylinder 2 is arranged below the discharge port 11 and the center line of the lifting cylinder 2 coincides with the center line of the discharge port 11, so that the powder in the funnel 1 naturally falls into the lifting cylinder 2 through the discharge port 11. The funnel 1 has a feed port 12 at the top, and the stirring assembly 3 includes a stirring rod 31, a motor 32 arranged above the feed port 12 to drive the stirring rod 31 to rotate, and an adjustment frame 33 arranged at one side of the funnel 1 to install the motor 32. One end of the stirring rod 31 is connected to the motor 32, and the other end extends into the discharge port 11 at the bottom of the funnel 1, so that when the stirring rod 31 is driven to rotate by the motor 32, the powder accumulated in the discharge port 11 is loosened.
[0022] The funnel 1 is fixedly mounted on the upper part of the lifting cylinder 2 through the support frame 4. The stirring rod 31 is a metal strip with spiral protrusions on the circumference. The diameter of the stirring rod 31 is set to 2 mm. The stirring rod 31 is driven by the motor 32 to rotate along the inner wall of the discharge port 11 at a speed of one rotation per 3 seconds.
[0023] The adjustment frame 33 includes a vertical rod 34 and a horizontal rod 35. One end of the horizontal rod 35 is movably connected to the vertical rod 34, and the other end is fixedly connected to the motor 32, so that the height of the motor 32 and the stirring rod 31 can be adjusted by sliding the horizontal rod 35 axially along the vertical rod 34. An annular sleeve 36 is connected to one end of the horizontal rod 35. The sleeve 36 is sleeved on the vertical rod 34 and slidably connected to the vertical rod 34. A bolt 37 is provided on one side of the sleeve 36, so that when the sleeve 36 slides axially along the vertical rod 34 to a predetermined position, the bolt 37 is tightened to lock and fix. One end of the bolt 37 passes through the side wall of the sleeve 36 and is in close contact with the side wall of the vertical rod 34.
[0024] The adjustment frame 33 also includes a base 38, and the vertical rod 34 is fixedly mounted on the base 38. The base 38 is arranged in an arc shape, and the arc-shaped inner wall of the base 38 is adapted to the arc-shaped outer wall of the lifting cylinder 2, and the center line of the base 38 coincides with the center line of the stirring rod 31, so that when the base 38 is adapted to be arranged outside the lifting cylinder 2, the stirring rod 31 extends into the discharge port 11 at the bottom of the funnel 1 along the center line of the funnel 1.
[0025] When the utility model is working, firstly, the stirring assembly 3 is installed on the basis of the existing detection device (funnel 1 and lifting cylinder 2), the arc-shaped base 38 of the stirring assembly 3 is adapted to be arranged on the outside of the lifting cylinder 2, the cross bar 35 is adjusted to a suitable height and the bolts 37 are tightened to lock and fix, at this time, the stirring rod 31 extends into the discharge port 11 at the bottom of the funnel 1 along the center line of the funnel 1; then the cement powder is added into the funnel 1 from the feed port 12, and the cement powder naturally falls into the lifting cylinder 2 along the discharge port 11 of the funnel 1 under the action of gravity. In this process, due to the gravity and friction of the cement powder, It is easy to form a self-arch phenomenon near the discharge port 11, blocking the discharge port 11. At this time, turn on the motor 32 to drive the stirring rod 31 to rotate along the inner wall of the discharge port 11 in the funnel 1 at a speed of one revolution per 3 seconds to help loosen the cement powder and ensure that the cement powder falls naturally. The position between the discharge port 11 of the funnel 1 and the lifting cylinder 2 will not change. When the naturally falling cement powder fills the lifting cylinder 2, the weight of the lifting cylinder 2 is measured at this time, and based on the mass and volume of the lifting cylinder 2, the mass of the cement powder per unit volume in the lifting cylinder 2 in the loose state, that is, the cement bulk density, is calculated.
[0026] Compared with existing technologies:
[0027] The bulk density of cement is determined in accordance with the requirements of GB175-2007. This comparative test uses the same type of cement (Conch brand P.O42.5MPa cement, the sample is dried in a (110±5)℃ drying oven).
[0028] (1) The existing detection device only uses a funnel and a lifting cylinder. In order to ensure the falling of cement powder during the experiment, it is necessary to gently tap the discharge port at the lower end of the funnel to help the cement powder fall. The experimental data are shown in Table 1.
[0029] Determination of bulk density in loose state Data Table 1:
[0030]
[0031] In Table 1, the test data fluctuates greatly, and many data exceed the ±0.02g / cm3 range of the test data error of the density specified in the national standard. The main reason for the error is that the material is added once during the test, and the self-arching phenomenon causes the discharge port to be blocked. With the help of external force, that is, knocking on the discharge port to help the cement powder fall, the knocking process is also a process of cement powder re-densification. At this time, the external force increases the fall of the cement powder, and the process falls in an unnatural state, falling in the form of collapse. At the same time, when knocking on the funnel to help the cement powder fall, due to the light weight of the entire device, when external force is used, the position between the discharge port and the lifting cylinder is easily displaced, not on the same center line, and then the data fluctuates greatly. The entire test process takes a long time and the time changes greatly. The difference in time depends on the speed of the cement powder falling. The speed of the cement powder falling depends on the surface tension, friction and density between the cement powder. These factors are not only related to the cement powder itself, but also to the size and direction of the force we use when knocking on the funnel. The test process requires the help of external force to help the sample fall. When the external force acts, the vibration of the material in the funnel causes the cement powder on the upper surface of the funnel to rise. At the same time, the collapse of the cement powder at the discharge port also causes an impact on the cement powder in the lifting tube, causing the dust to increase again. The dust concentration of the entire test is relatively high, which not only pollutes the air but also affects the health of the test personnel.
[0032] (2) The cement bulk density detection device provided in the present application was used, and a stirring assembly was installed on the basis of the existing detection device. During the experiment, the cement powder was helped to fall by directly connecting the stirring assembly. The experimental data are shown in Table 2.
[0033] Determination of bulk density in loose state Data Table 2:
[0034]
[0035] In Table 2, from the standard deviation and coefficient of variation, the test data is very stable, with almost no fluctuations. The diameter of the discharge port is 20mm. A slight vibration can easily cause the port to be dense, making it difficult to discharge cement. The cement powder is loosened by rotating the stirring rod with a diameter of 2mm at a speed of one turn every 3 seconds to ensure that the cement powder can fall naturally. Since the entire device is light in weight, the position between the discharge port and the lifting cylinder will not be displaced without the action of external force, and it will always remain on the same center line, avoiding fluctuations in the test data caused by changes in the discharge position. The entire test process takes a short time, and the cement powder falls at a uniform speed throughout the process. The test time is short, the average value is not much different, and the test data is balanced each time. There is no dust during the test process. Since there is no need to knock on the funnel, the cement powder in the funnel and the cement powder in the lifting cylinder will not fly, and the air and ground environment can be maintained very well.
[0036] The cement bulk density detection device provided in the present application adds a stirring assembly on the basis of the existing funnel and riser, and effectively prevents the displacement of the funnel and riser without modifying the existing device structure, thus avoiding the shortcomings of dust, inaccurate data, etc. The device has strong applicability, and no longer requires strong human assistance during the detection process, which can effectively save labor, reduce the labor intensity of testers, and avoid human interference caused by different testers during operation. The experimental data is more stable and has a certain uniformity and consistency, thereby reducing the discreteness of the bulk density test results and being closer to the true value. It also takes a short time and generates less dust, and has a high promotion value, which is beneficial to ensuring the mix ratio of concrete and the quality of construction projects. The device is suitable for various cement production enterprises, construction project laboratories, and construction industry inspection and testing institutions.
[0037] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.
Claims
1. A cement bulk density detection device, characterized in that: The invention comprises a funnel (1), a lifting cylinder (2) and a stirring assembly (3). The bottom of the funnel (1) is provided with a discharge port (11). The lifting cylinder (2) is arranged below the discharge port (11) and the center line of the lifting cylinder (2) coincides with the center line of the discharge port (11), so that the powder in the funnel (1) naturally falls into the lifting cylinder (2) through the discharge port (11). The top of the funnel (1) is provided with a feed port (12). The stirring assembly (3) comprises a stirring rod (31), a motor (32) arranged above the feed port (12) to drive the stirring rod (31) to rotate, and an adjustment frame (33) arranged on one side of the funnel (1) to mount the motor (32). One end of the stirring rod (31) is connected to the motor (32), and the other end extends into the discharge port (11) at the bottom of the funnel (1), so that when the stirring rod (31) is driven to rotate by the motor (32), the powder accumulated in the discharge port (11) is loosened.
2. The cement bulk density detection device according to claim 1, characterized in that: The funnel (1) is fixedly mounted above the lifting cylinder (2) via a supporting frame (4).
3. The cement bulk density detection device according to claim 1, characterized in that: The adjustment frame (33) comprises a vertical rod (34) and a horizontal rod (35), one end of the horizontal rod (35) is movably connected to the vertical rod (34), and the other end is fixedly connected to the motor (32), so that the height of the motor (32) and the stirring rod (31) can be adjusted by sliding the horizontal rod (35) axially along the vertical rod (34).
4. The cement bulk density detection device according to claim 3, characterized in that: One end of the cross bar (35) is connected to an annular sliding sleeve (36), which is sleeved on the vertical rod (34) and slidably connected to the vertical rod (34). A bolt (37) is provided on one side of the sliding sleeve (36), so that when the sliding sleeve (36) slides axially along the vertical rod (34) to a predetermined position, the bolt (37) is tightened to lock and fix it.
5. The cement bulk density detection device according to claim 4, characterized in that: One end of the bolt (37) passes through the side wall of the sliding sleeve (36) and is in close contact with the side wall of the vertical rod (34).
6. The cement bulk density detection device according to claim 3, characterized in that: The adjustment frame (33) further comprises a base (38), and the vertical rod (34) is fixedly mounted on the base (38).
7. The cement bulk density detection device according to claim 6, characterized in that: The base (38) is arranged in an arc shape, and the arc-shaped inner wall of the base (38) is adapted to the arc-shaped outer wall of the lifting cylinder (2), and the center line of the base (38) coincides with the center line of the stirring rod (31), so that when the base (38) is adapted to be arranged on the outside of the lifting cylinder (2), the stirring rod (31) extends into the discharge port (11) at the bottom of the funnel (1) along the center line of the funnel (1).
8. The cement bulk density detection device according to claim 1, characterized in that: The stirring rod (31) is a metal strip with spiral protrusions on the circumference.
9. The cement bulk density detection device according to claim 8, characterized in that: The diameter of the stirring rod (31) is set to 2 mm. The stirring rod (31) is driven by the motor (32) to rotate along the inner wall of the discharge port (11) at a speed of one rotation per 3 seconds.