CN107101909B - A wet density testing device - Google Patents

Abstract

The invention discloses a wet density testing device which comprises a water tank, a hanging scale frame, an electronic scale, a weighing disc, an irregular sample box, an annular sample frame, a resistance heater, a water injection assembly and a drainage assembly, wherein two frame legs of the hanging scale frame are respectively fixed at the tops of two opposite side surfaces of the water tank, the hanging scale frame is provided with a connection which is in relative sliding connection with the hanging scale frame, the connection ring is connected with the top of the electronic scale through a connection rope, the lower part of the electronic scale is connected with the weighing disc through a connection rope and a hook, the irregular sample box and the annular sample frame are respectively arranged at the position, close to the top, of the inner side wall of the water tank, the resistance heater is arranged at the position, close to the bottom, of the inner side wall of the water tank, and the water injection assembly and the drainage assembly are respectively arranged at the positions, close to the top and close to the bottom, and are communicated with the interior of the water tank. The invention can rapidly and accurately measure the wet density of the annular or irregular block-shaped sample.

Description

A wet density testing device

technical field

The invention belongs to the field of solid density testing devices, in particular to a wet density testing device.

Background technique

(W₀为样品在空气中的重量，W₁为样品在水中的重量，ρ₁为水的密度)求出样品的湿密度。由于许多固体样品的微结构中都含有开放孔洞，如果只是短时间在水中浸泡，无法有效排出内部开放孔洞中的空气，还需要进行水煮处理帮助得到较精确的湿密度。In the process of modern product production, processing and research and development of new materials, density is often a key physical parameter that needs to be measured frequently, and it has important reference value for evaluating and improving product or material performance. For various solid samples with a density greater than water, the traditional density testing device mostly uses the principle of the Archimedes drainage method to calculate the wet density of the sample (the sample volume does not include open pores, but includes closed pores): when testing, first place the sample Obtain the weight of the sample in water on the tray submerged in water, and then according to the formula

(W ₀ is the weight of the sample in air, W ₁ is the weight of the sample in water, ρ ₁ is the density of water) Calculate the wet density of the sample. Since the microstructure of many solid samples contains open pores, if they are only soaked in water for a short time, the air in the internal open pores cannot be effectively discharged, and boiling treatment is required to help obtain a more accurate wet density.

Therefore, there are following problems in measuring the wet density of solids using the above-mentioned conventional devices:

1. To accurately obtain the wet density of the sample, the sample needs to be boiled and pretreated before weighing;

2. When measuring, it is necessary to manually move the sample into and out of the water tray. In order to obtain a more accurate density value, it is necessary to keep the sample fully wet during the process of moving the boiled sample into the tray, so as to avoid air re-entering the open pores in the sample, which requires more operators and increases the error rate. . In addition, if the sample is irregular, the movement operation will be more difficult and the chance of introducing human error will be higher.

3. When the number of samples to be tested is large, the manual sample change process is cumbersome, and the skill level and state of the operator have a greater impact on the test results, which is easy to introduce more errors, and it is difficult to guarantee the consistency and repeatability of the test;

4. The machining accuracy and cost of the measurement components of the device are relatively high.

It can be seen that although the traditional density testing device is universal, there are still many shortcomings in the face of irregular material shapes, high testing accuracy requirements or mass testing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wet density testing device for the above-mentioned deficiencies in the prior art, which is a device that can quickly and accurately measure the wet density of ring-shaped or irregular block samples, and can not only make up for the traditional density measurement The device has shortcomings in improving the accuracy of wet density testing of a single sample and dealing with the density testing of large batches of samples, and can effectively reduce the negative impact of sample shape on testing operations.

The technical solution adopted in the present invention is: a wet density testing device, including a water tank, a hanging scale frame, an electronic scale, a weighing pan, an irregular sample box, a ring-shaped sample rack, a resistance heater, a water injection assembly and a drainage assembly, The two legs of the hanging scale rack are respectively fixed on the two opposite side tops of the water tank, the hanging scale rack is provided with a relatively sliding connection, the connecting ring is connected to the top of the electronic scale through a connecting rope, and the electronic scale is connected to the top of the electronic scale. The bottom of the scale is connected to the weighing pan through a connecting rope and a hook, the irregular sample box and the ring-shaped sample rack are respectively arranged at the position near the top of the inner wall of the water tank, and the resistance heater is arranged at a position near the bottom of the inner wall of the water tank, The water injection component and the drainage component are arranged on the outer wall of the water tank near the top and the bottom respectively and communicate with the inside of the water tank.

In one of the embodiments, the weighing pan includes a rectangular parallelepiped tray, a first tripod with a hanging ring on the top, and a second tripod with a hook on the top, and the bottom of the second tripod is fixed on One of the sides of the tray is integrally formed with it, the side of the tray opposite to the second tripod has a shaft through hole, and the side of the bottom bar of the first tripod is provided with a shaft matching the shaft through hole, so The rotating shaft is inserted into the through hole of the tray rotating shaft, and the hook of the second tripod is connected with the hanging ring of the first tripod.

In one of the embodiments, the irregular sample box includes a chute with an opening on the top and one of its sides and a sample cell arranged in the chute and sliding with the inner side wall of the chute, the chute and the chute with the opening The opposite side of the side is provided with a connection through hole, and the side of the sample grid is provided with a connecting rod passing through the connection through hole and sliding therewith, and the end of the connecting rod away from the sample grid passes through the side wall of the water tank.

In one of the embodiments, the ring-shaped sample holder includes a fixed seat fixed on the inner wall of the water tank, and a cross arm is arranged at one end of the fixed seat close to the inside of the water tank, and a push block is slidably connected to the cross arm, and the push block is slidably connected to the cross arm. Below the block is provided a push rod that passes through the side wall of the sink.

In one of the embodiments, the water injection assembly includes a water inlet pipe communicating with the inside of the water tank and a water inlet valve arranged on the water inlet pipe.

In one of the embodiments, the drain assembly includes a drain pipe communicating with the inside of the sink and a drain valve disposed on the drain pipe.

The beneficial effects of the present invention are:

1. When measuring the wet density of a solid sample, integrate the pretreatment process of the sample with the test process to reduce the sample transfer process and effectively improve the test accuracy;

2. Compared with the traditional test equipment, the present invention designs two types of sample injection methods according to the characteristics of the sample shape, optimizes the sample injection process, and avoids the air re-entering the sample during the sample movement process and reduces the accuracy of the wet density calculation results ;

3. When measuring multiple samples, the steps are simple, the sample change is quick, and the probability of human error is effectively reduced. The process is repeatable and the test results are highly consistent;

4. The device has simple structure, low cost and easy processing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the weighing pan of the present invention;

Fig. 3 is the front view of weighing pan of the present invention;

Fig. 4 is the structural representation of irregular sample box of the present invention;

Fig. 5 is a schematic structural view of the irregular sample box chute of the present invention;

Fig. 6 is a schematic diagram of the structure of the sample cell of the irregular sample box of the present invention;

Fig. 7 is the schematic diagram of the structure of the annular sample holder of the present invention;

Fig. 8 is a schematic diagram of the present invention adopting irregular sample box sampling step 1;

Fig. 9 is a schematic diagram of the second step of sample introduction using an irregular sample box in the present invention;

Fig. 10 is a schematic diagram of the third step of sample introduction using an irregular sample box in the present invention;

Fig. 11 is a schematic diagram of the present invention adopting a sample injection step of a ring sample rack;

Fig. 12 is a schematic diagram of the second step of sample introduction using a ring sample rack in the present invention;

Fig. 13 is a schematic diagram of the third step of sample injection using a ring sample rack in the present invention.

In the figure: 1. Sink; 2. Hanging scale rack; 3. Electronic scale; 4. Weighing pan; 5. Irregular sample box; 6. Ring sample rack; 7. Resistance heater; 8. Water injection component; 9 , drainage assembly; 41, tray; 42, first tripod; 43, second tripod; 44, shaft through hole; 45, shaft; 51, chute; 52, sample grid; 53, connection through hole; 54, connecting rod; 61, fixed seat; 62, cross arm; 63, push block; 64, push rod.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 7, a wet density testing device includes a water tank 1, a hanging scale rack 2, an electronic scale 3, a weighing pan 4, an irregular sample box 5, a ring-shaped sample rack 6, and a resistance heater 7 , the water injection assembly 8 and the drainage assembly 9, the two legs of the hanging scale frame 2 are respectively fixed on the two opposite side tops of the water tank 1, the hanging scale frame 2 is provided with a relatively sliding connection with it, and the connecting ring The top of the electronic scale 3 is connected by a connecting rope, and the bottom of the electronic scale 3 is connected with the weighing pan 4 by a connecting rope and a hook. The irregular sample box 5 and the ring-shaped sample rack 6 are respectively arranged on the inner wall of the water tank 1 near the top. The resistance heater 7 is arranged on the inner side wall of the water tank 1 near the bottom, and the water injection assembly 8 and the drain assembly 9 are respectively arranged on the outer side wall of the water tank 1 near the top and near the bottom and communicates with the inside of the water tank 1 .

In this embodiment, the weighing pan 4 includes a rectangular parallelepiped tray 41, a first tripod 41 with a hanging ring on the top, and a second tripod 43 with a hook on the top. The bottom of 43 is fixed on one side of the tray 41 and integrally formed with it, the side of the tray 41 opposite to the second tripod 43 has a shaft through hole 44, and the side of the bottom bar of the first tripod 41 is provided with The rotating shaft 45 matched with the rotating shaft through hole 44 , the rotating shaft 45 is inserted into the rotating shaft through hole 44 of the tray 41 , and the hook of the second tripod 43 is connected with the hanging ring of the first tripod 42 .

In this embodiment, the irregular sample box 5 includes a chute 51 with an opening on the top and one side thereof, and a sample grid 52 arranged in the chute 51 and sliding with the inner side wall of the chute 51, the chute 51 The side opposite to the side with the opening is provided with a connecting through hole 53, and the side of the sample grid 52 is provided with a connecting rod 54 passing through the connecting through hole 53 and sliding therewith, and one end of the connecting rod 54 away from the sample grid 52 is passed through. Through the side wall of tank 1.

In this embodiment, the ring-shaped sample holder 6 includes a fixed seat 61 fixed on the inner wall of the water tank 1, and one end of the fixed seat 61 close to the inside of the water tank 1 is provided with a cross arm 62, and the cross arm 62 is slidably connected with a A push block 63 , a push rod 64 passing through the side wall of the water tank 1 is arranged below the push block 63 .

In this embodiment, the water injection assembly 8 includes a water inlet pipe communicating with the inside of the water tank 1 and a water inlet valve arranged on the water inlet pipe.

In this embodiment, the drain assembly 9 includes a drain pipe communicating with the inside of the sink 1 and a drain valve disposed on the drain pipe.

The test device of the present invention includes the following two test situations:

1. The process of sampling with irregular sample box 5:

Step 1: As shown in Figure 8, the irregular sample whose weight W ₀ in the air has been weighed is placed in a grid of the irregular sample box 5; open the water injection component 8 of the water tank 1, and inject pure water until the irregular sample box 5 The sample inside is completely submerged in water, and the power supply of the resistance heater 7 is connected, and the resistance heater 7 power supply is turned off after the sample is fully boiled in boiling water;

可算出被测样品的湿密度；如果不规则样品盒5内有多个样品，再次用“去皮”键使电子秤3归零，然后继续将下一个样品推入托盘41，读取新的W₁数值，并按上述公式计算第二个样品的湿密度，后续样品依次类推；Step 2: As shown in Figure 9, horizontally move the electronic scale 3 suspended on the hanging scale frame 2, so that the weighing pan 4 is located below the opening end of the irregular sample box 5, and press the electronic scale 3 after the weighing pan 4 stands still in water The "tare" key of the scale 3 resets the value to zero; pushes the connecting rod 54 of the irregular sample box 5 to push the irregular sample into the weighing pan 4, and the reading of the electronic scale 3 at this time is the weight _W of the sample in water , according to the formula

The wet density of the sample to be tested can be calculated; if there are multiple samples in the irregular sample box 5, use the "tare" key again to reset the electronic scale 3 to zero, then continue to push the next sample into the tray 41 to read the new W ₁ value, and calculate the wet density of the second sample according to the above formula, and so on for subsequent samples;

Step 3: As shown in Figure 10, after the test, loosen the hook on the top of the second tripod 43 on the weighing pan 4, manually turn the weighing pan 4 along the rotating shaft 45 in the middle, and slide the sample into the water tank 1 .

2. The process of sampling with the ring sample rack 6:

Step 1: As shown in Figure 11, the ring-shaped sample whose weight W ₀ in the air has been weighed is inserted into the cross arm 62 of the ring-shaped sample holder 6; the water injection assembly 8 of the water tank 1 is opened, and pure water is injected until the ring-shaped sample holder The sample on the 6 racks is completely submerged in the water, and the power supply of the resistance heater 7 is connected, and the resistance heater 7 power supply is turned off after the sample is fully boiled in boiling water;

可算出被测样品的湿密度；如果环状样品架6上有多个样品，再次用“去皮”键使电子秤归零，然后继续将下一个样品推入托盘41，读取新的W₁数值，并按上述公式计算第二个样品的湿密度，后续样品依次类推；Step 2: As shown in Figure 12, horizontally move the electronic scale 3 suspended on the hanging scale frame 2, so that the weighing pan 4 is located below the end of the cross arm 62 of the annular sample rack 6, and wait for the weighing pan 4 to stand in the water. Press the "tare" key of the electronic scale 3 to reset the value to zero; push the push rod 64 of the ring-shaped sample holder 6 to push the ring-shaped sample into the weighing 4, and the reading of the electronic scale 3 at this time is the sample in water. Weight W ₁ , according to the formula

Can calculate the wet density of the tested sample; If there are multiple samples on the annular sample holder 6, use the "tare" key again to make the electronic scale return to zero, then continue to push the next sample into the tray 41, and read the new W ₁ value, and calculate the wet density of the second sample according to the above formula, and so on for subsequent samples;

Step 3: As shown in Figure 13, loosen the hook on the top of the second tripod 43 on the weighing pan 4 after the test, and manually turn the weighing pan 4 along the rotating shaft 45 in the middle, so that the sample slides down into the water tank 1 .

In addition, when there are irregular samples and circular samples to be tested at the same time, the above two types of processes can be carried out alternately during the test as required.

The above-mentioned embodiments only express the specific implementation manners of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (5)

1. A wet density testing device, characterized in that: comprising a water tank, a hanging scale frame, an electronic scale, a weighing pan, an irregular sample box, an annular sample holder, a resistance heater, a water injection assembly and a drainage assembly, the hanging The two legs of the scale frame are respectively fixed on the two opposite side tops of the water tank. The hanging scale frame is provided with a connecting ring that slides relative to it. The connecting ring is connected to the top of the electronic scale through a connecting rope. The irregular sample box and the ring-shaped sample rack are respectively arranged at the position near the top of the inner wall of the water tank, and the resistance heater is arranged at the position near the bottom of the inner wall of the water tank through a connecting rope and a hook. The water injection assembly and the drainage assembly are respectively arranged on the outer wall of the water tank near the top and near the bottom and communicate with the inside of the water tank. The irregular sample box includes a chute with an opening on the top and one side and is arranged in the chute and connected The sample grid slides on the inner side wall of the chute, the side of the chute opposite to the side with the opening is provided with a connecting through hole, the side of the sample grid is provided with a connecting rod passing through the connecting through hole and sliding with it, the connecting rod The end of the rod away from the sample well passes through the side wall of the tank. 2. A kind of wet density testing device according to claim 1, characterized in that: the weighing pan comprises a cuboid tray, a first tripod with a hanging ring on the top and a second tripod with a hook on the top. tripod, the bottom of the second tripod is fixed on one side of the tray and integrally formed with it, the opposite side of the tray to the second tripod has a shaft through hole, the first tripod A rotating shaft matching the through hole of the rotating shaft is provided on the side of the bottom bar, the rotating shaft is inserted into the through hole of the rotating shaft of the tray, and the hook of the second tripod is connected with the hanging ring of the first tripod. 3. A kind of wet density testing device according to claim 1, characterized in that: the ring-shaped sample rack includes a fixed seat fixed on the inner wall of the water tank, and one end of the fixed seat near the inside of the water tank is provided with a cross arm, A push block is slidably connected to the cross arm, and a push rod passing through the side wall of the water tank is arranged under the push block. 4 . The wet density testing device according to claim 1 , wherein the water injection assembly includes a water inlet pipe communicating with the inside of the water tank and a water inlet valve arranged on the water inlet pipe. 5 . 5 . The wet density testing device according to claim 1 , wherein the drain assembly includes a drain pipe communicating with the inside of the water tank and a drain valve disposed on the drain pipe. 6 .

Images