CN209485911U - A Density Meter for Net Basket Method Test - Google Patents

Abstract

The utility model discloses a kind of mesh basket method test densimeters, including instrument body, sink is offered inside instrument body, the bottom surface of sink and the bottom surface of instrument body are arranged in parallel, and hook is provided with above sink, and hook is mounted on the top of instrument body by strut, mesh basket is connected in the bottom of hook, mesh basket is placed in sink, and the Weighing mechanism for measuring weight of material in mesh basket is additionally provided on hook, is additionally provided with multiple levelling mechanisms being used in the bottom of instrument body；Mesh basket method provided by the utility model test densimeter solves the problems, such as that common mesh basket method surveys densimeter and is unable to controlled level by the levelling mechanism of setting, reduces because of measurement error caused by unhorizontal.

Description

A Density Meter for Net Basket Method Test

technical field

The utility model relates to a densitometer for testing, in particular to a densitometer for net basket method testing.

Background technique

In the current "Highway Engineering Aggregate Test Regulations" (JTG E42-2005), the density and water absorption of coarse aggregates are measured by the basket method. However, there is currently no uniform standard densitometer for the basket method test. The densitometers in the laboratory are all self-made, and there are the following problems:

(1) The self-made density meter cannot guarantee the level of the instrument, which affects the test results;

(2) The water temperature of the self-made density meter cannot be controlled between 15°C and 25°C specified in the specification. Under different test temperatures, the density of water is different, which affects the measurement of relative density;

(3) The standard requires that the hanging basket is made of corrosion-resistant materials, with a diameter and height of about 150mm, and a 1mm-2mm screen mesh around and at the bottom. However, there is no uniform specification for the hanging basket at present, and many simple devices in the laboratory do not meet this requirement, and it is easy to cause certain errors due to non-compliance with the specification;

(4) The self-made density meter is very inconvenient for discharging and retrieving materials. It is necessary to frequently remove the hanging basket from the electronic scale and then take it out of the bucket. During this period, the aggregate is easily scattered due to the hanging basket turning over.

Contents of the invention

The purpose of the utility model is to provide a densitometer for the basket method test, which is used to solve the problems in the prior art that the densitometer cannot guarantee the instrument level and the water temperature cannot be controlled, which leads to inaccurate measurement results of the densitometer.

In order to achieve the above tasks, the utility model adopts the following technical solutions:

A density meter for basket method test, comprising an instrument body, a water tank is provided on the top of the instrument body along the depth direction of the instrument body, the bottom surface of the water tank is arranged parallel to the bottom surface of the instrument body, and A hook is arranged above the water tank, and the hook is installed on the top of the instrument body through a pole, and a net basket is connected to the bottom of the hook, and the net basket is placed in the water tank. A weighing mechanism for measuring the weight of the material in the basket is also arranged on the hook, and a plurality of leveling mechanisms for measuring the weight of the material in the instrument body are also arranged at the bottom of the instrument body.

Further, the leveling mechanism is a leveling knob, and a level is arranged on the instrument body.

Further, a funnel support is movably connected to the top of the instrument body, and a material funnel is installed on the funnel support.

Further, a water inlet and an overflow are respectively provided on the side of the water tank, the height of the water inlet from the bottom of the water tank is greater than the height of the overflow from the bottom of the water tank.

Further, an overflow tank is connected to the side of the water tank through the overflow port, and a water outlet is opened at the bottom of the overflow tank.

Further, an electric heating device is provided around the water tank inside the instrument body, and a power supply is also provided inside the instrument body, and the electric heating device is electrically connected to the power supply.

Further, the weighing mechanism includes a tension sensor, the tension sensor is installed on the hook, the tension sensor is used to measure the tension of the basket, and the tension sensor is connected with the power supply electrical connection;

The weighing mechanism also includes a weighing controller arranged on the side wall of the instrument body, and the weighing controller is electrically connected with the tension sensor and the power supply.

Compared with the prior art, the utility model has the following technical characteristics:

1. The basket method test density meter provided by the utility model solves the problem that the ordinary basket method densitometer cannot control the level through the set leveling mechanism, and reduces the measurement error caused by the non-level;

2. The basket method test density meter provided by the utility model solves the problem that the ordinary basket method densitometer cannot maintain the temperature through the electric heating device, and reduces the influence of the test temperature on the test results;

3. The densitometer for the net basket method test provided by the utility model regulates the specifications of the hanging basket and makes the test standardized; at the same time, it is equipped with a material funnel with the net basket, which is convenient for moving in materials, and does not need to take the hanging basket out of the water frequently, improving the test performance. efficiency.

Description of drawings

Fig. 1 is the basket method test density meter provided in one embodiment of the present invention.

The symbols in the figure represent: 1-instrument body, 2-sink, 3-hook, 4-net basket, 5-weighing mechanism, 6-leveling mechanism, 7-level, 8-water inlet, 9-overflow port, 10-Overflow tank, 11-Electric heating device, 12-Funnel support, 13-Material hopper, (5-1)-Tension sensor, (5-2)-Weighing controller.

Detailed ways

Net basket method density measurement: move the material into the net basket, measure the mass mω of the sample in water; lift the net basket, after a little dripping, pour the coarse aggregate directly on the wrung wet towel; use a wrung towel Gently wipe the water on the surface of the aggregate particles until no shiny water traces can be seen on the surface (that is, the saturated surface dry state), and immediately weigh the surface dry mass mf of the aggregate while maintaining the surface dry state; place the aggregate Put it in a shallow pan, put it in an oven and dry it to constant weight, and weigh its dried mass as ma. According to the above three masses, the apparent relative density, surface dry relative density and gross volume relative density can be obtained through the formula.

Material: refers to coarse aggregate. In asphalt mixture, coarse aggregate refers to gravel, crushed gravel, screened gravel and slag with a particle size greater than 2.36mm; in cement concrete, coarse aggregate refers to a particle size greater than 4.75mm mm of gravel, gravel and broken gravel.

According to the above technical scheme, the utility model discloses a densitometer for basket method test, which includes an instrument body 1, and a water tank 2 is provided on the top of the instrument body 1 along the depth direction of the instrument body 1, and the water tank 2 The bottom surface of the instrument body 1 is arranged parallel to the bottom surface of the instrument body 1, and a hook 3 is arranged above the water tank 2. The hook 3 is installed on the top of the instrument body 1 through a pole, and on the top of the hook 3 The bottom is connected with a net basket 4, and the net basket 4 is placed in the water tank 2, and the weighing mechanism 5 for measuring the weight of the material in the net basket 4 is also arranged on the described hook 3. In the described instrument The bottom of the body 1 is also provided with a plurality of leveling mechanisms 6 for use.

The density meter provided by the utility model indirectly measures the density of the material by measuring the weight of the material in water. The density meter includes an instrument body 1, and the instrument body 1 can be a structure such as a cylinder or a cuboid. In this embodiment, as shown in Figure 1 As shown, the instrument body 1 is a cuboid, with an opening on the top surface of the cuboid, and a water tank 2 inside the instrument body 1, the opening of the water tank 2 is the same as the opening of the instrument body 1, that is to say, from the instrument The opening of the body 1 is excavated in the depth direction of the instrument body 1 to form a water tank 2 , and the bottom surface of the water tank 2 is flush with the bottom surface of the instrument body 1 .

The densitometer for net basket method test also includes a net basket 4, which is installed on the instrument body 1 through a hook 3, and the net basket 4 is located inside the water tank 2 for containing materials, and a weighing mechanism is installed on the hook 3 5. The weighing mechanism 5 can be a weight scale or a gravity, tension detection device, etc., and is used to measure the weight of the material in the basket 4 in the water of the water tank 2, so as to obtain the density of the material.

The bottom of the basket method test density meter provided by the utility model is also provided with a leveling mechanism 6, which is used to adjust the level of the water surface in the water tank 2, to ensure that the water surface is arranged in parallel with the horizontal plane, so as to reduce the Measurement error due to level. Wherein the leveling mechanism 6 can be an electric leveling mechanism, when the leveling mechanism 6 is an electric structure, the distance sensor that can be arranged on the bottom surface of the instrument body 1, whether the 4 corners of the bottom surface of the measuring instrument body 1 are consistent with the height of the horizontal plane , thereby adjusting the level of the instrument body 1, it can also be a manual leveling mechanism, the leveling mechanism 6 can adjust the height through a hydraulic device, and can also adjust the height of the instrument body 1 from the ground by rotating a knob.

Net basket 4 is a standard hanging basket, is 150mm by standard diameter and height, and net basket 4 four walls and the bottom have the mesh of 1mm size.

Therefore, when using the densitometer for the basket method test provided in this embodiment, the operation steps are as follows: first, pour water into the water tank 2 until the opening of the water tank 2 is flush, level the instrument body 1 through the leveling mechanism 6, and put the material into In the net basket 4, utilize the weighing mechanism 5 on the hook 3 to measure the weight of the material at this time, thereby obtaining the density of the material.

Optionally, the leveling mechanism 6 is a leveling knob, and a level 7 is arranged on the instrument body 1 .

As shown in Figure 1, in this embodiment, four leveling mechanisms 6 are connected to the bottom surface of the instrument body 1, the leveling mechanism 6 is a leveling knob, and the leveling knob is connected to the instrument body 1 by threads, and by rotating The leveling knob adjusts the depth that the leveling knob extends into the instrument body 1, thereby adjusting the distance between the bottom surface of the instrument body 1 and the bottom surface. In addition, in order to ensure accurate leveling, a level 7 is provided on the instrument body 1. When adjusting Usually, the air bubble of the level 7 is located at the center of the level 7 .

Optionally, a material funnel 13 is movable on the top of the instrument body 1 , and the material funnel 13 is installed on the top of the instrument body 1 through the funnel bracket 12 .

As shown in Figure 1, in order to facilitate the test personnel to add materials to the basket 4, a material funnel 13 is detachably installed on the top of the instrument body 1, the minimum aperture of the material funnel 13 is greater than 60mm, and generally requires a coarser material greater than the maximum particle size. materials. The material funnel 3 is installed on the top of the instrument body 1 through the funnel bracket 12, wherein the funnel bracket 12 can be movably installed on the top of the instrument body 1, and the material funnel 13 is fixedly installed on the funnel bracket 12, and the funnel bracket 12 can be mounted on the instrument body The top of the main body 1 moves. When it is necessary to add materials to the 4 baskets, the material funnel 13 is driven by the funnel bracket 12 to move to the top of the water tank 2. When not in use, it moves to the side of the top of the instrument body 1.

As shown in Figure 1, in this embodiment, the funnel support 12 includes a rotating shaft, the rotating shaft is connected with the top of the instrument body 1, a support that can move around the rotating shaft is installed on the rotating shaft, and a The material funnel 13 drives the material funnel 13 to move through the rotation of the support.

The provided material funnel 13 is convenient for moving in the material, and the hanging basket is not frequently taken out of the water, thereby improving the test efficiency.

Optionally, a water inlet 8 and an overflow 9 are respectively provided on the side of the water tank 2, and the height of the water inlet 8 from the bottom of the water tank 2 is greater than the distance from the overflow port 9 to the bottom of the water tank 2. high.

As shown in Figure 1, in order to facilitate water filling and drainage in the water tank 2, a water inlet 8 and a water overflow 9 are provided on the side of the water tank 2, and the water inlet 8 and the water overflow 9 are respectively located on a pair of side walls of the instrument body 1 .

Optionally, an overflow tank 10 is connected to the side of the water tank 2 through the overflow port 9 , and a water outlet is opened at the bottom of the overflow tank 10 .

As shown in FIG. 1 , in order to conveniently collect the overflowed water in the water tank 2 , one side of the overflow port 9 is connected to the water tank 2 , and the other side is connected to the overflow tank 10 .

Optionally, an electric heating device 11 is provided around the water tank 2 inside the instrument body 1, and a power supply is also provided inside the instrument body 1, and the electric heating device 11 and the power supply connection.

As shown in Figure 1, an electric heating device 11 for heating the temperature of the water in the heat preservation water tank 2 is arranged inside the instrument body 1. Controller, temperature controller is electrically connected with electric heating device 11, is used for setting the temperature of electric heating device 11 and the heat preservation time, has solved the problem that common net basket method densitometer cannot keep temperature by setting electric heating device 11, reduces Influence of small test temperature on test results.

Optionally, the weighing mechanism 5 includes a tension sensor 5-1, the tension sensor 5-1 is installed on the hook 3, and the tension sensor 5-1 is used to measure the weight of the basket 4, the tension sensor 5-1 is electrically connected to the power supply;

The weighing mechanism 5 also includes a weighing controller 5-2 arranged on the side wall of the instrument body 1, and the weighing controller 5-2 is electrically connected with the tension sensor 5-1 and the power supply .

As shown in Figure 1, in the present embodiment, weighing mechanism 5 does not use electronic scale, because when adopting electronic scale in the prior art, electronic scale is turned upside down, and hook 3 is hung on the electronic scale, and this mode operates Trouble, but in the present embodiment, the tension sensor 5-1 is combined with the weighing controller 5-2 to convert the measured tension into weight, wherein the tension sensor 5-1 is used to measure the tension of the material in the basket 4, The weighing controller 5-2 is used for displaying the weight of the material in the net basket 4 and zeroing, which facilitates the use of the test personnel, and improves the accuracy of the measurement through the conversion of the pulling force.

The operating process of the basket method test density meter provided by the utility model is as follows:

Fill water into the water tank 2, submerge the basket 4 in the water tank 2, and the water surface height reaches the overflow port 9 of the water tank 2. At this time, the leveling mechanism 6 is used to adjust the water level in the water tank 2, and the weighing controller 5- 2. Zero adjustment, adjust the electric heating device 11 so that the water temperature is in the range of 15°C to 25°C, keep the temperature constant for 10 minutes, put the material into the basket 4 through the material funnel 13, and the water level in the water tank 2 is controlled by the overflow port 9, When no more water flows out of the overflow port 9, weigh the mass of the material in the water, and then conduct subsequent tests according to the specifications. After conversion, calculate the density and water absorption of the aggregate. After the test, open the overflow The water outlet of tank 10 drains the water in overflow tank 10.

Claims (7)

1. a kind of test of mesh basket method densimeter, including instrument body (1), along instrument sheet at the top of the instrument body (1) The depth direction of body (1) offers sink (2), and the bottom surface of the sink (2) is parallel with the bottom surface of instrument body (1) Setting, is provided with hook (3), the hook (3) is mounted on the instrument body by strut above the sink (2) (1) top is connected with mesh basket (4) in the bottom of the hook (3), and the mesh basket (4) is placed in the sink (2), The Weighing mechanism (5) for measuring weight of material in mesh basket (4) is additionally provided on the hook (3), which is characterized in that in institute The bottom for the instrument body (1) stated is additionally provided with multiple levelling mechanisms (6).

2. mesh basket method test densimeter as described in claim 1, which is characterized in that the levelling mechanism (6) is leveling Knob is provided with level meter (7) on the instrument body (1).

3. mesh basket method test densimeter as described in claim 1, which is characterized in that on the top of the instrument body (1) Portion is movable to be connected with funnel stand (12), and Materials hopper (13) are equipped on the funnel stand (12).

4. mesh basket method test densimeter as described in claim 1, which is characterized in that distinguish in the side of the sink (2) Water inlet (8) and overflow port (9) are offered, height of the water inlet (8) apart from the sink (2) bottom is greater than the overflow The height of mouth (9) apart from the sink (2) bottom.

5. mesh basket method test densimeter as claimed in claim 4, which is characterized in that also logical in described sink (2) side It crosses the overflow port (9) and is connected with overflow launder (10), offer water outlet in the bottom of the overflow launder (10).

6. mesh basket method test densimeter as described in claim 1, which is characterized in that in the interior of the instrument body (1) Portion is provided with electric heater unit (11) around the sink (2), is additionally provided with electricity in the inside of the instrument body (1) Source, the electric heater unit (11) and the power electric connection.

7. mesh basket method test densimeter as claimed in claim 6, which is characterized in that the Weighing mechanism (5) includes drawing Force snesor (5-1), the tension sensor (5-1) are mounted on the hook (3), the tension sensor (5- 1) for measuring the pulling force of the mesh basket (4), the tension sensor (5-1) and the power electric connection；

Weighing mechanism (5) further includes the weighing controller (5-2) being arranged on the side wall of the instrument body (1), described Weighing controller (5-2) and the tension sensor (5-1) and power electric connection.