An auxiliary device for sand equivalent test

Abstract

The utility model discloses an auxiliary device for sand equivalent test, include: support base, support, mobile slide, locking screw, transparent plastic bucket, tap, flow controller, rubber pipe, flush pipe and test tube, and flow controller is by joint pipe and bilateral straight -through ball valve composition, auxiliary facilities when using, transparent plastic bucket liquid surface highest point to support bottom distance always keeps in 920mm~1200mm, and test tube bottom and base keep in same horizontal operation platform, and the flush solution that flushes out through flush pipe will contact test tube 100ml, 380ml scale before, should make solution small through flow controller, ensure the accuracy of test. The auxiliary device can adjust the test height required by test and control solution flow rate accurate reach the required test tube scale line, and the operation of test personnel can effectively control solution flow rate, can effectively eliminate the influence of artificial factor in the test process, thereby ensure the accuracy of sand equivalent test result.

Description

Technical Field

[0001] This utility model relates to the field of testing technology for highway and waterway engineering materials, specifically to an auxiliary device for sand equivalent testing. Background Technology

[0002] The sand equivalent (SE) test is mainly used to determine the content of clay or impurities in fine aggregates such as natural sand, manufactured sand, and stone chips, in order to assess the cleanliness of the aggregates. It involves washing the aggregate sample with a flushing fluid to flocculate and suspend impurities, and then calculating the sand equivalent value by measuring the height ratio of the sediment. This test is applicable to fine aggregates used in asphalt mixtures, inorganic binders, and cement concrete, with a maximum aggregate size not exceeding 4.75 mm. Therefore, sand equivalent determination has received widespread attention in industries such as highway and waterway engineering. However, the instruments configured in the existing "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG 3432-2024) have the following problems in practical applications: 1. The liquid level of the solution is not easy to control during the test: The highest liquid level in the transparent plastic bucket will gradually decrease during the test, resulting in a decrease in static pressure, unstable flow rate, and difficulty in controlling the liquid level. It is difficult to find a suitable support or platform on site to accurately adjust and control this height, resulting in the lack of a unified standard for the test and inaccurate test results.

[0003] 2. Difficulty in controlling the solution level to reach the test tube graduation line (100ml, 380ml): When adding rinsing solution to the test tube, it is not easy to accurately control the level to the 100mm graduation line, and there may be visual errors when reading the scale. At the end of the rinsing operation, the liquid flow needs to be quickly shut off the moment the liquid level reaches the 380mm graduation line. The timing of the operation is difficult to grasp precisely. Uneven lifting speed of the rinsing tube or premature shut-off of the liquid flow will lead to inaccurate liquid level readings.

[0004] Therefore, based on the testing methods in the "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG 3432-2024), an auxiliary device for sand equivalent testing is being developed to address the deviations in test results caused by the above-mentioned issues. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary device for sand equivalent testing, aiming to overcome the shortcomings of existing technologies and solve the problem that the test equipment used in current sand equivalent testing auxiliary facilities cannot adjust the required test height and control the solution flow rate, resulting in non-standard and inaccurate test operations. In order to solve the problems existing in the test process and relatively improve the accuracy of the test results, this auxiliary device for sand equivalent testing was invented. The structure of this auxiliary facility can adjust the required test height and control the solution flow rate, which greatly reduces the influence of human operation.

[0006] Therefore, this utility model proposes an auxiliary device for sand equivalent testing, comprising: The support system includes a metal base, at least three supports vertically fixed to the metal base, and a movable slide plate sleeved on the supports and slidable up and down thereal, wherein the movable slide plate is locked and positioned to the supports by locking screws. The solution container is a transparent plastic bucket placed on the movable slide plate; A flushing piping system includes a faucet, a flow controller, and a flushing pipe connected in sequence via a rubber hose, wherein the flow controller is used to adjust the flow rate of the flushing fluid. The support has height markings on its side wall. By adjusting the height of the movable slide, the distance between the highest liquid level of the transparent plastic bucket and the bottom of the metal base is maintained within the range of 920mm to 1200mm.

[0007] As a preferred technical solution of this application, the flow controller consists of a connector pipe and a double-sided straight-through ball valve, and the solution flow rate is controlled by adjusting the opening degree of the double-sided straight-through ball valve.

[0008] As a preferred technical solution of this application, the locking screw is a Torx-shaped rubber-head handle screw, including a screw and a handle, and the locking and unlocking between the movable slide and the bracket is realized by rotating the handle.

[0009] As a preferred technical solution of this application, the metal base and the bracket are fixedly connected by welding.

[0010] As a preferred technical solution of this application, the flushing pipe is a hollow metal pipe with a conical outlet and several holes on the conical surface for the solution to flow out.

[0011] As a preferred technical solution of this application, the side wall of the bracket is marked with a scale in the range of 920 ~ 1200 mm.

[0012] The auxiliary device for sand equivalent testing provided by this utility model has the following beneficial effects: 1) Precise and stable control of liquid level is achieved: Through a support system with height markings and a lockable sliding plate, the liquid level in the solution container (transparent plastic bucket) can be quickly and accurately adjusted and stabilized within the standard range of 920mm~1200mm. This ensures constant static pressure during rinsing, thereby guaranteeing the stability of the rinsing flow rate and fundamentally solving the problems of unstable flow rate and inconsistent testing standards caused by liquid level drops.

[0013] 2) Precise control of solution calibration is achieved: Through the flow controller (especially the double-sided straight-through ball valve) integrated into the flushing pipeline, operators can finely and continuously adjust the flushing fluid flow rate. This allows for easy and precise control of the liquid level to reach the 100ml and 380ml marks when adding solution to the test tube, and the flow can be quickly and smoothly shut off the moment the 380ml mark is reached, effectively avoiding visual errors and inaccurate timing caused by the inconvenience of manual operation.

[0014] 3) Significantly improved accuracy and comparability of test results: By standardizing and instrumenting the most critical parameters of height and flow rate in the test, the arbitrariness and error of human operation are greatly reduced, significantly improving the accuracy and repeatability of sand equivalent test results. This ensures that test data obtained by different operators, different laboratories, and at different times have good consistency and comparability, providing a more reliable data foundation for the quality evaluation of engineering materials.

[0015] 4) Easy to operate and improves detection efficiency: The device has a simple structure and is easy to adjust (such as the Torx-shaped rubber head handle screw, which is easy to operate by hand). It simplifies the originally complex and experience-dependent debugging process, reduces the difficulty of operation and technical threshold, and helps to improve the overall detection efficiency.

[0016] 5) Promote the unified implementation of standards and specifications: This utility model is an effective supplement and support to standard testing methods, enabling all testing personnel to strictly perform tests in accordance with unified, visible and quantifiable standards, and strengthening the process management of engineering quality control.

[0017] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a front view of the auxiliary device for sand equivalent testing according to this utility model; Figure 2 This is a schematic diagram of the structure of this practical flow controller; Figure 3 This is a schematic diagram of the locking screw structure in this utility model; Explanation of reference numerals in the attached drawings: 1. Metal base; 2. Bracket; 3. Movable slide; 4. Locking screw; 5. Transparent plastic bucket; 6. Faucet; 7. Flow controller; 8. Rubber hose; 9. Flushing hose; 10. Test tube; 11. Connecting pipe; 12. Double-sided straight-through ball valve; 13. Handle; 14. Screw. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-3 As shown, this utility model relates to an auxiliary device for sand equivalent testing, which facilitates the control of solution scale operation in test cylinder 10 during sand equivalent determination testing. The auxiliary device includes: metal base 1, bracket 2, movable slide plate 3, locking screw 4, transparent plastic bucket 5, faucet 6, flow controller 7, rubber tube 8, rinsing tube 9, test cylinder 10, and operating table.

[0021] Specifically, a fixed support system is assembled using a metal base 1, at least three supports 2, a movable slide plate 3, and locking screws 4. The metal base and the supports are welded together. The support is placed on an operating table. The movable slide plate 3 is provided with guide holes that match the supports 2, allowing the movable slide plate 3 to slide up and down within the supports 2. It is then temporarily locked and positioned by the radially arranged locking screws 4.

[0022] Among them, such as Figure 3 As shown, the locking screw 4 is a Torx-shaped rubber-tipped handle screw, consisting of screw 14 and handle 13. The movable slide plate 3 is adjusted and tightened onto the bracket 2 by the locking screw 4, so that its transparent plastic bucket meets the height requirements of the test.

[0023] The support system and test cylinder 10 are placed on the operating table and are on the same horizontal plane. The side wall of the support 2 is marked with a scale in the range of 920mm to 1200mm. The movable slide plate 3 is adjusted by tightening screw 4. A transparent plastic bucket 5 containing a solution is placed on the movable slide plate 3. During the test, the distance from the highest point of the liquid level in the transparent plastic bucket 5 to the bottom of the base of the support 2 is always kept at 920mm to 1200mm, and the bottom of the test cylinder 10 and the bottom of the support base are kept on the same horizontal operating table.

[0024] Then, the water tap 6, flow controller 7, rubber hose 8, and rinsing pipe 9 are connected in sequence to form a rinsing pipe water system. The flow controller 7 is connected to the rubber hose 8 at both ends. When the water tap 6 is turned on, the test cylinder 10 receives the solution released from the rinsing pipe. The flow controller 7 adjusts the solution flow rate to ensure that the solution accurately reaches the scale line (100ml, 380ml) on the test cylinder. The rinsing pipe 9 is a hollow metal tube with one end being hollow and round, and the other end being conical with some holes to allow the solution to flow out into the test cylinder 10.

[0025] like Figure 2As shown, the flow controller 7 consists of a connector pipe 11 and a double-sided straight-through ball valve 12; the flow rate of the solution is controlled by the double-sided straight-through ball valve 12 so that it accurately reaches the required test tube scale line (100ml, 380ml scale).

[0026] The working principle and process of the auxiliary device for sand equivalent testing of this utility model are briefly described below.

[0027] Preparation of the test solution: Determine the amount of rinsing solution as needed. Typically, prepare 5L at a time, which can be used for approximately 10 tests. If the number of tests is less, the amount can be reduced proportionally. However, it should not be less than 2L to minimize experimental error. The concentration of the rinsing solution should be controlled by ensuring that the content of calcium chloride, glycerol, and formaldehyde per liter is 2.79g, 12.12g, and 0.34g, respectively. Weigh the following reagents for preparing 5L of rinsing solution: calcium chloride 14.0g ± 0.2g; glycerol 60.6g ± 0.5g; formaldehyde 1.7g ± 0.05g.

[0028] Auxiliary facility operation process: The support system and test cylinder are placed on the operating table and on the same horizontal plane. The support is marked with a scale in the range of 920mm to 1200mm. The movable slide is adjusted by tightening the screws. A transparent plastic bucket containing a solution is placed on the movable slide. During the test, the distance from the highest point of the liquid level in the transparent plastic bucket to the bottom of the support base is always kept at 920mm to 1200mm. Then, the faucet, flow controller, rubber hose, and flushing pipe are connected in sequence to form a flushing pipe water circuit system. The flow controller is connected to the rubber hose at both ends. When the faucet is turned on, the test cylinder receives the solution released by the flushing pipe. The flow controller adjusts the solution flow rate to ensure that the solution accurately reaches the scale lines (100ml and 380ml) on the test cylinder. Subsequent steps: The subsequent mechanical vibration, static setting, and sedimentation measurement steps were carried out in strict accordance with the standard method T0334-2005 of the "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG 3432-2024).

[0029] Although the auxiliary device for sand equivalent testing proposed in this application is an innovation in process, it is a key step in promoting the standardization and precision of the test. By stabilizing the core flushing flow rate and standardizing all operating conditions, it greatly improves the accuracy and repeatability of the test results. This is of great practical significance for ensuring project quality, improving testing efficiency, and reducing labor costs.

[0030] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An auxiliary device for sand equivalent testing, characterized in that, include: The support system includes a metal base (1), at least three supports (2) vertically fixed on the metal base (1), and a movable slide plate (3) sleeved on the supports (2) and slidable up and down along them. The movable slide plate (3) is locked and positioned to the supports (2) by locking screws (4). The solution container is a transparent plastic bucket (5) placed on the movable slide plate (3); The flushing piping system includes a faucet (6), a flow controller (7) and a flushing pipe (9) connected in sequence via a rubber hose (8), wherein the flow controller (7) is used to adjust the flow rate of the flushing fluid; The side wall of the bracket (2) is marked with height markings. By adjusting the height of the movable slide plate (3), the distance between the highest liquid level of the transparent plastic bucket (5) and the bottom of the metal base (1) is maintained within the range of 920mm to 1200mm.

2. The auxiliary device for sand equivalent testing according to claim 1, characterized in that, The flow controller (7) consists of a connector pipe (11) and a double-sided straight-through ball valve (12), and the solution flow rate is controlled by adjusting the opening degree of the double-sided straight-through ball valve (12).

3. The auxiliary device for sand equivalent testing according to claim 1, characterized in that, The locking screw (4) is a tortoise-shaped rubber-head handle screw, including a screw (14) and a handle (13). The locking and unlocking between the movable slide (3) and the bracket (2) can be achieved by rotating the handle (13).

4. The auxiliary device for sand equivalent testing according to claim 1, characterized in that, The metal base (1) and the bracket (2) are fixedly connected by welding.

5. The auxiliary device for sand equivalent testing according to claim 1, characterized in that, The flushing pipe (9) is a hollow metal pipe with a conical outlet and several holes on the conical surface for the solution to flow out.

6. The auxiliary device for sand equivalent testing according to claim 1, characterized in that, The bracket (2) has markings on its side wall in the range of 920mm to 1200mm.

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