Square hole sieve for fine aggregate grain composition test
By incorporating an annular connecting strip and a magnetically connected screen frame base within the main body of the screen frame, the problem of particle loss caused by gaps between the screen frame and the screen mesh is solved, enabling the screen frame to be disassembled and replaced, thus reducing testing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-17
AI Technical Summary
The existing square-hole sieve used for sand particle size distribution testing has gaps at the connection between the sieve frame and the sieve mesh, which causes fine particles to be lost. Furthermore, when the sieve mesh is damaged, the entire sieve frame is scrapped, increasing the testing cost.
An annular connecting strip is integrally formed inside the screen frame body. The screen frame base is magnetically connected to the annular connecting strip, and it can be disassembled and replaced when the screen is damaged, avoiding leakage from gaps and waste of the screen frame.
It effectively prevents the loss of fine particles, reduces testing costs, and extends the service life of the sieve frame through a detachable sieve design.
Smart Images
Figure CN224127860U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a square-hole sieve for fine aggregate particle size distribution testing, belonging to the technical field of gradation testing equipment. Background Technology
[0002] According to the "Test Procedure for Sand and Gravel Aggregates in Hydraulic Concrete" (DL / T5151-2014) and "Sand for Construction" (GB / T14684-2022), the square-hole sieves used for sand particle size distribution testing should meet the requirements of GB / T6003.1 and GB / T6003.2 for square-hole test sieves. That is, the square-hole sieve consists of a sieve frame and a metal mesh, wherein the sieve frame includes a main body and a base; the edges of the sieve frame should be flat and smooth, and should be able to be easily stacked together with other sieves, covers, receiving trays, etc. with the same basic size as the sieve frame; the structure between the sieve frame and the sieve mesh should prevent the material from getting stuck.
[0003] Currently, the sieve frames and screens of square-hole sieves used for sand particle size distribution testing are often connected by pressing, resulting in an annular vertical gap at the connection between the screen and the frame. During the sieving test, needle-like particles and fine particles of 1.25 mm and below can easily be lost through the gap between the sieve frame and the screen, thus affecting the test results. In addition, when the screen is damaged, it is not easy to replace, so the entire square-hole sieve is usually scrapped, resulting in waste of the entire sieve frame and increased test costs. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a square-hole sieve for fine aggregate particle size distribution testing.
[0005] This utility model is achieved through the following technical solution:
[0006] A square-hole sieve for fine aggregate particle size distribution testing includes a sieve frame and a sieve mesh. The sieve frame includes a sieve frame body and a sieve frame base. An annular connecting strip is integrally formed inside the sieve frame body. The upper part of the sieve frame base extends into the sieve frame body and is detachably connected to the annular connecting strip. The sieve mesh is located on the side of the sieve frame base near the annular connecting strip.
[0007] The inner diameter of the sieve frame body is 300mm.
[0008] The width of one side of the annular connecting strip is 15mm.
[0009] The annular connecting strip is coaxially disposed inside the screen frame body, and the distance from the annular connecting strip to the lower end face of the screen frame body is 20mm.
[0010] The screen frame base is fitted with the screen frame body with a clearance.
[0011] The base of the sieve frame is cylindrical.
[0012] The sieve frame base is magnetically connected to the annular connecting strip.
[0013] A ring magnet A is embedded in the top of the sieve frame base.
[0014] At the bottom of the annular connecting strip, an annular magnet B is embedded at a position corresponding to the annular magnet A.
[0015] The beneficial effects of this utility model are as follows: An annular connecting strip is integrally formed within the sieve frame body, connecting to the upper part of the sieve frame base. This annular connecting strip covers the gaps between the sieve frame base and the sieve frame body, as well as the gaps between the sieve frame base and the annular connecting strip. This effectively prevents needle-like and fine particles from leaking through the gaps between the sieve mesh and the sieve frame, and through the gaps between the sieve frame base, the sieve frame body, and the annular connecting strip. Furthermore, since the sieve mesh is mounted on the sieve frame base, and the sieve frame base and the annular connecting strip are detachably connected, when the sieve mesh is damaged, only the sieve frame base with the sieve mesh installed needs to be replaced. This avoids scrapping the entire square-hole sieve or the entire sieve frame, allowing the sieve frame body to be reused and helping to reduce testing costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0017] Figure 2 This is a top view of the structure of this utility model;
[0018] Figure 3 for Figure 2 Sectional view along AA;
[0019] Figure 4 This is a schematic diagram of the structure of the sieve frame body of this utility model;
[0020] Figure 5 This is a schematic diagram of the structure of the screen frame base of this utility model.
[0021] In the diagram: 1-sieve frame, 11-sieve frame body, 111-ring connecting strip, 12-sieve frame base, 2-sieve mesh. Detailed Implementation
[0022] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.
[0023] like Figures 1 to 5As shown, the square-hole sieve for fine aggregate particle size distribution testing according to this utility model includes a sieve frame 1 and a sieve mesh 2. The sieve frame 1 includes a sieve frame body 11 and a sieve frame base 12. An annular connecting strip 111 is integrally formed inside the sieve frame body 11. The upper part of the sieve frame base 12 extends into the sieve frame body 11 and is detachably connected to the annular connecting strip 111. The sieve mesh 2 is disposed on the side of the sieve frame base 12 near the annular connecting strip 111. In use, the sieve mesh 2 is disposed inside the sieve frame base 12 near the upper surface of the sieve frame base 12. An annular connecting strip 111 is integrally formed within the sieve frame body 11, connecting to the upper part of the sieve frame base 12. The annular connecting strip 111 also covers the gaps between the sieve frame base 12 and the sieve frame body 11, as well as the gap between the sieve frame base 12 and the annular connecting strip 111. This effectively prevents needle-like and fine particles from leaking through the gaps between the sieve mesh 2 and the sieve frame 1, and through the gaps between the sieve frame base 12, the sieve frame body 11, and the annular connecting strip 111. Furthermore, since the sieve mesh 2 is mounted on the sieve frame base 12, and the sieve frame base 12 and the annular connecting strip 111 are detachably connected, when the sieve mesh 2 is damaged, only the sieve frame base 12 with the sieve mesh 2 installed needs to be replaced. This avoids scrapping the entire square-hole sieve or the entire sieve frame 1, allowing the sieve frame body 11 to be reused and helping to reduce testing costs.
[0024] The inner diameter of the screen frame body 11 is 300mm.
[0025] The width of one side of the annular connecting strip 111 is 15mm.
[0026] The annular connecting strip 111 is coaxially disposed inside the screen frame body 11, and the distance from the annular connecting strip 111 to the lower end face of the screen frame body 11 is 20mm.
[0027] The screen frame base 12 is fitted with the screen frame body 11 with a clearance.
[0028] The screen frame base 12 is cylindrical.
[0029] The screen frame base 12 is magnetically connected to the annular connecting strip 111. This improves the ease of assembly and disassembly of the screen frame base 12 and the annular connecting strip 111.
[0030] A ring magnet A is embedded in the top of the sieve frame base 12.
[0031] At the bottom of the annular connecting strip 111, an annular magnet B is embedded at a position corresponding to the annular magnet A. In use, the annular magnet B and the annular magnet A attract each other and magnetically attract to each other, thereby achieving a magnetic connection between the screen frame base 12 and the annular connecting strip 111.
[0032] Specifically, when multiple square-hole screens are stacked, the screen frame base 12 of the upper square-hole screen is inserted into the screen frame body 11 of the lower square-hole screen, thereby achieving stacking.
Claims
1. A square-hole sieve for fine aggregate particle grading tests, characterized by: The screen includes a screen frame (1) and a screen mesh (2). The screen frame (1) includes a screen frame body (11) and a screen frame base (12). An annular connecting strip (111) is integrally formed inside the screen frame body (11). The upper part of the screen frame base (12) extends into the screen frame body (11) and is detachably connected to the annular connecting strip (111). The screen mesh (2) is located on the screen frame base (12) on the side close to the annular connecting strip (111).
2. The square-hole sieve for fine aggregate particle grading test according to claim 1, characterized in that: The inner diameter of the sieve frame body (11) is 300mm.
3. The square-hole sieve for fine aggregate particle grading test according to claim 1, characterized in that: The width of one side of the annular connecting strip (111) is 15mm.
4. The square-hole sieve for fine aggregate particle gradation testing of claim 1, wherein: The annular connecting strip (111) is coaxially disposed inside the screen frame body (11), and the distance from the annular connecting strip (111) to the lower end face of the screen frame body (11) is 20mm.
5. The square-hole sieve for fine aggregate particle gradation testing of claim 1, wherein: The screen frame base (12) is fitted with the screen frame body (11) with a clearance.
6. The square-hole sieve for fine aggregate particle gradation testing of claim 1, wherein: The sieve frame base (12) is cylindrical.
7. The square-hole sieve for fine aggregate particle gradation testing of claim 1, wherein: The sieve frame base (12) is magnetically connected to the annular connecting strip (111).
8. The square-hole sieve for fine aggregate particle grading test according to claim 7, characterized in that: A ring magnet A is embedded in the top of the sieve frame base (12).
9. The square-hole sieve for fine aggregate particle grading test according to claim 8, characterized in that: The bottom of the annular connecting strip (111) has an annular magnet B embedded at a position corresponding to the annular magnet A.