A sand and gravel bulk density testing device
By designing a sand and gravel bulk density testing device that includes a base, an electronic scale, and containers of various shapes, the problem of large testing errors caused by differences in container shape and size is solved, and more efficient and accurate sand and gravel bulk density measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU IND VOCATIONAL TECHN COLLEGE
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, the methods for testing the bulk density of sand and gravel suffer from large errors in test results due to differences in container shape and size, and are also cumbersome to operate.
A sand and gravel bulk density testing device was designed, comprising a base, an electronic scale, a vertical rod, a horizontal rod, a sand-filling funnel, and sand-filling containers of different shapes. The containers can be easily replaced through roller tracks and clamping devices. The bulk density is calculated by measuring the mass of sand and gravel using the electronic scale.
It improves the accuracy and efficiency of testing, reduces manual operations, and ensures the reliability and consistency of test results in containers of different shapes and sizes.
Smart Images
Figure CN224456488U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sand and gravel density testing technology, specifically a sand and gravel bulk density testing device. Background Technology
[0002] Bulk density of sand and gravel is an important indicator for the quality inspection of sand and gravel used in construction. It is a scientific method to measure the mass per unit volume of sand and gravel under natural stacking conditions. The purpose is to provide data support for the selection, quality control, and management of sand and gravel materials in construction projects. In the mix design of bulk building materials such as concrete and mortar, the bulk density of sand and gravel is used to calculate and determine the proportions of sand, gravel, cement, and water.
[0003] my country's standards, such as "Sand for Construction" (GB / T 14684) and "Gravel and Crushed Stone for Construction" (GB / T 14685), specify methods for testing the bulk density of sand and gravel. The specific procedure involves first weighing the sand and gravel in a graduated cylinder, then calculating the bulk density using a density formula based on the cylinder's volume. However, the inventors believe that the testing methods specified in these standards have the following problems: Because sand and gravel are granular materials, voids form between particles when the aggregate is piled up. When the sand and gravel are placed in containers of different shapes and sizes, the voids formed between particles will vary due to differences in the outer edge shape and container volume, leading to variations in the bulk density. The bulk density measured from the same pile of sand and gravel placed in different square, conical, and cylindrical containers may be unequal. Therefore, the current method of testing bulk density using a single cylinder clearly has technical defects, and the current testing method involves a lot of manual operation, resulting in large errors in the test results.
[0004] To address the aforementioned technical deficiencies, this utility model provides a sand and gravel bulk density testing device. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a sand and gravel bulk density testing device, which has the advantage of being able to test the natural bulk density of the same pile of sand and gravel in cylindrical, square, and conical containers of different sizes. It solves the technical defects of the current method of testing bulk density using a single cylinder, as well as the problems of manual operation and large error in test results.
[0006] This utility model provides the following technical solution: a sand and gravel bulk density testing device, including a base and a sand container fixed base. An electronic scale is fixedly installed on the base. Vertical rods are fixedly connected to the four corners of the upper surface of the base. Horizontal crossbars are fixedly connected to the tops of two adjacent sets of vertical rods. Horizontal rods are fixedly connected to the tops of the vertical rods. The other ends of the horizontal rods are close to each other. A sand funnel is fixedly connected to the close ends of the horizontal rods. A sand container is provided on the upper surface of the sand container fixed base.
[0007] Preferably, the base is provided with a roller slide, and the lower surface of the sand container fixing base is equipped with rollers, which are in rolling connection with the inside of the roller slide.
[0008] Preferably, the sand container fixing base is equipped with clamping devices on all four sides, and the clamping devices are spring pins.
[0009] Preferably, the sand-filling funnel is positioned directly above the electronic scale.
[0010] Preferably, the sand container is one of cylindrical, square, or frustum-shaped containers of different volumes.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] The working process of this sand and gravel bulk density testing device is as follows: First, the sand container is fixed to the sand container base using a clamping device. Then, the fixed sand container is pushed onto the electronic scale on the base using the cooperation of the roller slide and rollers. The mass of the sand container and the sand container base is read and recorded. Next, the sand and gravel are naturally poured into the sand container below through the sand funnel at the top. When the top of the container is full, the top of the container is manually leveled, and the data from the electronic scale is read and recorded. Then, the bulk density is calculated according to the density formula based on the volume of the sand container and the difference in mass of the container before and after filling with sand. Finally, the sand container and the sand container base are pushed down from the sliding groove. The above steps are repeated with a sand container of a different shape to test and calculate the bulk density of the same pile of sand in different containers. By changing the sand container and repeating the above steps, multiple bulk densities of the same type of sand and gravel are obtained, and then the average value is taken. This device can test the packing density of the same pile of sand and gravel in containers of different shapes and volumes under natural stacking conditions, and then take the average value. It is more accurate than the current method of testing the packing density using a single cylindrical container. This device significantly reduces manual labor, improves experimental efficiency and accuracy, and effectively solves the problems of the current method of testing packing density using a single cylindrical container, which obviously has technical defects and involves a lot of manual operation and large error in the test results. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;
[0014] Figure 2 This is a schematic diagram of the roller slide and roller part of this utility model;
[0015] Figure 3 This is a schematic diagram of the structure of the container fixing base of this utility model;
[0016] Figure 4 This is a schematic diagram of the structure of different types of sand-filling containers of this utility model.
[0017] In the diagram: 1. Base; 2. Electronic scale; 3. Roller slide; 4. Vertical bar; 5. Horizontal bar; 6. Horizontal bar; 7. Sand funnel; 8. Sand container; 9. Sand container fixing base; 10. Roller; 11. Clamping device; 12. Spring pin. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] The bulk density test of sand and gravel is an important indicator for the quality inspection of sand and gravel used in construction. It uses scientific methods to determine the mass per unit volume of sand and gravel under natural stacking conditions, aiming to provide data support for the selection, quality control, and management of sand and gravel materials in construction projects. In the mix design of bulk building materials such as concrete and mortar, the bulk density of sand and gravel is used to calculate and determine the proportions of sand, gravel, cement, and water.
[0021] Currently, the method for measuring bulk density involves filling a graduated cylinder with sand and gravel, weighing it, and then calculating the bulk density using the density formula based on the cylinder's volume. However, because sand and gravel are granular materials, voids form between the particles when the aggregate is packed together. When the sand and gravel are placed in containers of different shapes and sizes, the voids between the particles will vary due to differences in the container's outer edge shape and volume, thus affecting the bulk density. The bulk density measured for the same pile of sand and gravel in different square, conical, and cylindrical containers may be different. Therefore, the current method of testing bulk density using a single cylinder clearly has technical limitations, and the current testing method involves a lot of manual operation, resulting in large errors in the test results.
[0022] To address the aforementioned technical deficiencies, this utility model provides the following technical solution: Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 A sand and gravel bulk density testing device includes a base 1 and a sand container fixing base 9. An electronic scale 2 is fixedly installed on the base 1. Vertical rods 4 are fixedly connected to the four corners of the upper surface of the base 1. Horizontal crossbars 5 are fixedly connected to the top of two adjacent sets of vertical rods 4. Horizontal rods 6 are fixedly connected to the top of the vertical rods 4. The other ends of the horizontal rods 6 are close to each other. A sand funnel 7 is fixedly connected to the close ends of the horizontal rods 6. A sand container 8 is provided on the upper surface of the sand container fixing base 9.
[0023] The base 1 is a square flat plate, and the sand container 8 is a cylindrical, square, or frustum-shaped container of different volumes.
[0024] The base 1 is provided with a roller slide 3, and the lower surface of the sand container fixing base 9 is equipped with a roller 10, which is in rolling connection with the inside of the roller slide 3.
[0025] During testing, first put Figure 4A sand container 8, as shown, is fixed to a sand container base 9. Rollers 10 mounted on the lower surface of the sand container base 9 are located inside roller tracks 3. By pushing the sand container base 9, it moves together with the sand container 8 to the upper surface of the electronic scale 2 and aligns with the sand funnel 7 above. The electronic scale 2 then reads the mass values of the sand container base 9 and the sand container 8 when empty. Finally, sand and gravel of the required bulk density are discharged into the sand container 8 through the sand funnel 7. When the top surface of container 8 is filled with sand, the top of container 8 is manually leveled, the data of electronic scale 2 is read and recorded, and then the bulk density is calculated according to the density formula based on the volume of sand container 8 and the mass difference of container 8 before and after filling with sand measured by electronic scale 2. Finally, the container 8 is pushed down from sliding groove 3 along with the fixed base 9 of sand container. The above steps are repeated with sand container 8 of another shape to test and calculate the bulk density of the same pile of sand in different containers. By changing sand container 8 and repeating the above steps, multiple bulk densities of the same sand are obtained, and then the average value is taken.
[0026] Among them, the sand container fixing base 9 is equipped with clamping devices 11 on all four sides, and the clamping devices 11 adopt spring pins 12.
[0027] according to Figure 2 and Figure 3 It is known that the clamping device 11 consists of a clamping plate, a sliding groove, a limiting rod, and a spring. When the sand container 8 needs to be placed on the sand container fixed base 9, the clamping plate is pushed outward to move. Since the bottom of the clamping plate slides inside the sliding groove, and the bottom of the clamping plate slides with the outer surface of the limiting rod, and one end of the spring is connected to one side of the clamping plate inside the sliding groove, the spring is stretched while the clamping plate is pushed to move. At this time, the sand container 8 is placed on the upper surface of the sand container fixed base 9, and the clamping plate is released, so that the clamping plate is clamped on the side of the sand container 8 under the elastic action of the spring, thereby limiting the position of the sand container 8.
[0028] The sand-filling funnel 7 is positioned directly above the electronic scale 2.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] 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.
[0031] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. All standard parts used can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods for each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art and are components known to those skilled in the art.
Claims
1. A sand and gravel bulk density testing apparatus, characterized by, The system includes a base (1) and a sand container fixing base (9). An electronic scale (2) is fixedly installed on the base (1). Vertical rods (4) are fixedly connected to the four corners of the upper surface of the base (1). Horizontal crossbars (5) are fixedly connected to the top of two adjacent sets of vertical rods (4). Horizontal rods (6) are fixedly connected to the top of the vertical rods (4). The other ends of the horizontal rods (6) are close to each other. A sand funnel (7) is fixedly connected to the close ends of the horizontal rods (6). A sand container (8) is provided on the upper surface of the sand container fixing base (9).
2. The sand accumulation density testing device according to claim 1, wherein: The base (1) is provided with a roller slide (3), and the lower surface of the sand container fixing base (9) is equipped with a roller (10), and the roller (10) is in rolling connection with the inside of the roller slide (3).
3. The sand accumulation density testing device according to claim 1, wherein: The sand container fixing base (9) is equipped with clamping devices (11) on its four sides, and the clamping devices (11) adopt spring pins (12).
4. The sand accumulation density testing device according to claim 1, wherein: The sand-filling funnel (7) is positioned directly above the electronic scale (2).
5. The apparatus of claim 1, wherein: The sand container (8) is one of cylindrical, square, or frustum-shaped containers of different volumes.