Mixed powder uniformity detection tool

Abstract

The utility model relates to the technical field of powder uniformity detection, in particular to a mixed powder uniformity detection tool which comprises a base, a dust raising assembly and an air supply assembly, the dust raising assembly comprises a shell, one end of the shell is provided with a powder outlet, and one side of the middle of the shell is provided with an air inlet hole connected with the air supply assembly; a powder collecting screen used for bearing to-be-detected mixed powder is arranged in the shell and arranged between the powder outlet and the air inlet. When the device is used, mixed powder to be detected is weighed and placed on the powder collecting screen, then the powder collecting screen is placed between the powder outlet and the air inlet, the powder collecting screen is blown by the air supply assembly, and graphite which is not adhered to iron powder is screened by air by utilizing the characteristic that the density of graphite powder in the mixed powder is low; finally, the weight of the to-be-detected mixed powder is measured, the uniformity of the graphite in the iron-based powder can be judged by comparing the weight data before and after, operation is simple, and the detection result is easy to draw a conclusion.

Description

Technical Field

[0001] The utility model relates to the technical field of powder uniformity detection, in particular to a mixed powder uniformity detection tool. Background Art

[0002] Graphite is a crucial component in iron-based powder metallurgy materials, enhancing their hardness and strength. However, graphite has a low density and poor uniformity with iron, which can easily lead to graphite segregation within the iron-based powder, severely impacting the material's performance and service life. To improve graphite uniformity, a small amount of spindle oil is typically added to the iron powder to bond the graphite to the iron powder surface. This method can address the graphite uniformity issue in iron-based powders to a certain extent, but the relatively low content of spindle oil does not guarantee sufficient bonding of the graphite to the iron powder surface. Therefore, the ability to quickly detect graphite uniformity and promptly adjust the powder mixing process is crucial for the production of iron-based powder metallurgy materials.

[0003] There are many existing technologies for detecting graphite uniformity, such as:

[0004] Chinese Patent Publication No. CN117030678A discloses a method and system for detecting the uniformity of amorphous carbon distribution on a graphite surface. The method involves dispersing graphite into single particles and testing them using a Raman spectrometer. The method then uses data such as the area ratio of the D and G peaks, the standard deviation of the area ratio, and the interquartile range of the area ratio to semi-quantitatively characterize the uniformity of the carbon distribution, thereby detecting the content of free carbon in the mixture.

[0005] However, since the entire detection process first requires dispersing graphite, then testing it with a Raman spectrometer, and finally analyzing the area difference data, the entire process is complicated to operate and has low detection efficiency. At the same time, it places high demands on the measurement personnel and requires the measurement personnel to have professional skills.

[0006] In view of this, we propose a mixed powder uniformity detection tool. Utility Model Content

[0007] The purpose of the utility model is to provide a detection tool with a simple structure and easy operation for semi-quantitative detection of the uniformity of iron-based powdered graphite, so as to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A mixed powder uniformity detection tool comprises a base, a dust-generating component and an air supply component, wherein the dust-generating component comprises a shell, a powder outlet is provided at one end of the shell, and an air inlet connected to the air supply component is provided on one side of the middle portion of the shell; a powder collecting screen for carrying the mixed powder to be detected is provided in the shell, and the powder collecting screen is provided below the powder outlet and above the air inlet; wherein the air supply component inputs gas into the shell through the air inlet, and filters the mixed powder to be detected on the powder collecting screen, and the gas entrains the powder with light specific gravity and is discharged from the powder outlet.

[0010] As a further solution of the present invention: a powder collector is slidably connected to one end of the shell away from the powder outlet, and the powder collector is used to collect tiny particles falling from the powder collecting screen.

[0011] As a further solution of the present invention: an opening for taking out and placing the powder collecting screen is provided on one side of the shell body above the powder collecting screen, and an arc plate for closing the opening is provided at the opening.

[0012] As a further solution of the present invention: an adjusting chamber is provided in the shell, one side of the adjusting chamber is connected to the air inlet, and the other side is provided with a plurality of oblique holes connected to the inner cavity of the shell, and the openings of the oblique holes face the powder collecting screen.

[0013] As a further solution of the present invention: a baffle is fixedly provided at one end of the regulating chamber, and the powder collecting screen is clamped on the baffle.

[0014] As a further solution of the present invention: the gas supply assembly includes a gas cylinder, the exhaust port of the gas cylinder is connected to a flow meter, a pressure valve and an air pipe in sequence, and the air pipe is movably connected to the air inlet of the shell.

[0015] As a further solution of the present invention: the aperture of the powder collecting screen is smaller than the particle size of the iron particles in the mixed powder to be detected.

[0016] As a further solution of the present invention: the flow rate of gas introduced into the shell is 1.3L / min to 1.5L / min.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the mixed powder uniformity detection tool, the mixed powder to be tested is weighed and placed on a powder collecting screen. The powder collecting screen is then placed between the powder outlet and the air inlet. The powder collecting screen is blown by the air supply component. By taking advantage of the low density of graphite powder in the mixed powder, the gas is used to screen the graphite that is not bonded to the iron powder. Finally, the weight of the mixed powder to be tested is measured. By comparing the weight data before and after, the uniformity of the graphite in the iron-based powder can be determined. The operation is simple and the test results are easy to draw conclusions.

[0019] 2. In the mixed powder uniformity detection tool, a powder collector is set under the powder collecting screen to collect tiny particles. The tiny particles are mixed with the powder screened by the powder collecting screen and measured, thereby reducing powder loss during the detection process and reducing detection errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0021] Figure 2 This is the exploded diagram of the overall structure of this scheme;

[0022] Figure 3 This is a cross-sectional view of the dust-generating body and powder collector of this scheme.

[0023] The meaning of each number in the figure is:

[0024] 1. Base;

[0025] 2. Dust-raising assembly; 201. Housing; 202. Powder collector; 203. Powder outlet; 204. Curved plate; 205. Adjustment chamber; 206. Baffle; 207. Powder collecting screen;

[0026] 3. Gas supply assembly; 301. Gas cylinder; 302. Flow meter; 303. Pressure valve; 304. Gas pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example

[0029] In iron-based powder metallurgy materials, graphite has a low density and poor uniformity with iron, which can easily cause graphite segregation in the iron-based powder, seriously affecting the performance and service life of the material. Therefore, during the iron-based powder metallurgy process, random sampling and testing of graphite uniformity are performed. However, existing testing technology first disperses the graphite, then tests it using a Raman spectrometer, and finally analyzes the area difference data. This makes the entire process complex and inefficient, and also places high demands on the measurement personnel, requiring them to have professional skills.

[0030] Therefore, see Figure 1 and Figure 2As shown, the purpose of this embodiment is to provide a mixed powder uniformity detection tool, including a base 1, a dust-generating component 2 and an air supply component 3. The dust-generating component 2 includes a shell 201, a powder outlet 203 is opened at one end of the shell 201, and an air inlet connected to the air supply component 3 is opened on one side of the middle of the shell 201; a powder collecting screen 207 for carrying the mixed powder to be tested is provided in the shell 201, and the powder collecting screen 207 is arranged below the powder outlet 203 and above the air inlet;

[0031] Since the mixed powder to be tested is mainly graphite powder, iron powder and a graphite-iron powder combination in which part of the graphite powder is bonded to the surface of the iron powder, the specific gravity relationship is that the graphite powder is smaller than the graphite-iron powder combination, and the graphite-iron powder combination is smaller than the iron powder. Therefore, by utilizing the low density of the graphite powder in the mixed powder, the air supply component 3 inputs gas into the shell 201 through the air inlet, and filters the mixed powder to be tested on the powder collecting screen 207, and the gas entrains the powder with light specific gravity and is discharged from the powder outlet 203; finally, the weight of the mixed powder to be tested is measured, and the uniformity of the graphite in the iron-based powder can be determined by comparing the weight data before and after. The operation is simple and the test results are easy to draw conclusions.

[0032] Taking into account that when the mixed powder to be tested is blown onto the powder collecting screen 207 by wind, tiny particles in the mixed powder to be tested may fall off the powder collecting screen 207, resulting in inaccurate data of the subsequent powder weight measurement, therefore, a powder collector 202 is slidably connected to the end of the shell 201 away from the powder outlet 203, and the powder collector 202 is used to collect tiny particles falling from the powder collecting screen 207. By arranging the powder collector 202 below the powder collecting screen 207, the tiny particles are collected by the powder collector 202, and the tiny particles are mixed with the powder sieved by the powder collecting screen 207 and measured, thereby reducing powder loss during the detection process and reducing detection errors. It should be noted that the aperture of the powder collecting screen 207 is smaller than the particle size of the iron particles in the mixed powder to be detected;

[0033] In order to facilitate the removal and placement of the powder collecting screen 207, the housing 201 is provided with an opening on one side above the powder collecting screen 207. Since the opening is close to the powder collecting screen 207, some powder may be blown out from the opening during the powder blowing process. Therefore, a detachable curved plate 204 is provided at the opening to seal the opening, ensuring that the powder can only be discharged from the powder outlet 203 at the top of the powder collecting screen 207.

[0034] Since the air supply assembly 3 is directly connected to the air inlet of the shell 201, the gas is directly filled into the shell 201, and the gas movement direction is not directly facing the powder collecting screen 207, which may cause the powder to be tested to be not blown evenly, and then cause some of the mixed powder to be tested to be not blown during screening, and some of the powder to be tested may be discharged from the shell 201 together with some iron powder and well-uniformed graphite due to the high gas wind speed. Therefore, please refer to Figure 3 As shown, a regulating chamber 205 is provided in the housing 201. One side of the regulating chamber 205 is connected to the air inlet, and the other side is provided with a plurality of oblique holes connected to the inner cavity of the housing 201. The openings of the oblique holes face the powder collecting screen 207. The gas directly charged into the housing 201 is first buffered by the regulating chamber 205 and then discharged from the oblique holes, so that the gas is evenly blown toward the powder collecting screen 207.

[0035] In order to facilitate fixing the powder collecting screen 207 in the housing 201 , a baffle 206 is fixed at one end of the regulating chamber 205 , and the powder collecting screen 207 is clamped on the baffle 206 ;

[0036] Further, the air supply component 3 is introduced:

[0037] The gas supply assembly 3 includes a gas cylinder 301, the exhaust port of the gas cylinder 301 is connected to a flow meter 302, a pressure valve 303 and an air pipe 304 in sequence, and the air pipe 304 is movably connected to the air inlet of the shell 201; after the compressed gas in the gas cylinder 301 is adjusted to a suitable pressure by the pressure valve 303, the gas flow is precisely controlled by the flow meter 302, and then transported to the shell 201 by the air pipe 304; when the flow rate of gas entering the shell 201 is 1.3L / min~1.5L / min, the graphite powder can be blown out of the shell 201, while the iron powder and the graphite-iron powder combination remain on the powder collecting screen 207.

[0038] In summary, the working principle of this solution is as follows:

[0039] First, in the same batch of samples, multiple portions of mixed powder are selected at different positions. Each portion is weighed, and 10g of mixed powder is accurately taken. Then, the mixed powder is evenly placed on the powder collecting screen 207, and the powder collecting screen 207 is placed on the baffle 206. The arc plate 204 and the powder collector 202 are used to seal the side opening of the shell 201, and the gas supply component 3 is started. After the compressed gas in the gas cylinder 301 is adjusted to a suitable pressure through the pressure valve 303, the gas flow is accurately controlled to 1.3L / min~1.5L / min through the flow meter 302, and then transported to the air inlet in the middle of the shell 201 through the air pipe 304; when the gas enters The regulating chamber 205 will first buffer the gas directly filled into the shell 201, and then discharge it from the oblique holes, so that the gas is blown evenly to the powder collecting screen 207, thereby blowing away the graphite that is not adhered to the iron powder on the powder collecting screen 207 and discharging it from the powder outlet 203. After the powder screening process is completed, the powder on the powder collector 202 and the powder collecting screen 207 is weighed together, and the two measurement data before and after of multiple mixed powders at different positions are compared. When the ratio of the detection data of multiple mixed powders has a large range, it means that the uniformity of the graphite is poor; when the ratio of the detection data of multiple mixed powders has a small range, it means that the uniformity of the graphite is good.

[0040] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0041] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A mixed powder uniformity detection tool, comprising a base (1), a dust emission component (2) and an air supply component (3), characterized in that: The dust-generating component (2) comprises a shell (201), one end of the shell (201) is provided with a powder outlet (203), and one side of the middle of the shell (201) is provided with an air inlet connected to the air supply component (3); a powder collecting screen (207) for carrying the mixed powder to be detected is provided in the shell (201), and the powder collecting screen (207) is arranged below the powder outlet (203) and above the air inlet; wherein, the air supply component (3) inputs gas into the shell (201) through the air inlet, and filters the mixed powder to be detected on the powder collecting screen (207), and the gas entrains the powder with a light specific gravity and is discharged from the powder outlet (203).

2. The mixed powder uniformity detection tool according to claim 1, characterized in that: One end of the shell (201) away from the powder outlet (203) is slidably connected to a powder collector (202), and the powder collector (202) is used to collect tiny particles falling from the powder collecting screen (207).

3. The mixed powder uniformity detection tool according to claim 1, characterized in that: The housing (201) is provided with an opening for taking in and placing the powder collecting screen (207) on one side thereof, and a curved plate (204) for closing the opening is provided at the opening.

4. The mixed powder uniformity detection tool according to claim 1, characterized in that: An adjusting chamber (205) is provided in the shell (201), one side of the adjusting chamber (205) is connected to the air inlet, and the other side is provided with a plurality of oblique holes connected to the inner cavity of the shell (201), the openings of the oblique holes facing the powder collecting screen (207).

5. The mixed powder uniformity detection tool according to claim 4, characterized in that: A baffle (206) is fixedly provided at one end of the regulating chamber (205), and the powder collecting screen (207) is clamped on the baffle (206).

6. The mixed powder uniformity detection tool according to claim 1, characterized in that: The gas supply assembly (3) comprises a gas cylinder (301), the exhaust port of the gas cylinder (301) is sequentially connected to a flow meter (302), a pressure valve (303) and an air pipe (304), and the air pipe (304) is movably connected to the air inlet of the housing (201).

7. The mixed powder uniformity detection tool according to claim 1, characterized in that: The pore size of the powder collecting screen (207) is smaller than the particle size of the iron particles in the mixed powder to be detected.

8. The mixed powder uniformity detection tool according to claim 1, characterized in that: The flow rate of gas introduced into the shell (201) is 1.3 L / min to 1.5 L / min.

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