Weighing device

Abstract

The utility model relates to a weighing device. The weighing device comprises a shell, a bearing unit, a weighing unit, a transmission unit and a circulating unit, a wind field in the test cavity forms circulation through the circulating fan, so that the uniformity of a temperature field in the test cavity is improved, and the consistency of sample drying conditions is ensured; dry gas or filtered air is introduced into the test cavity through the air inlet fan, and high-humidity air in the test cavity is discharged through the exhaust fan, so that the possibility of water condensation in the test cavity is reduced, and air replacement in the test cavity is realized; meanwhile, the air inlet fan and the air exhaust fan can play a role in cooling air in the test cavity, so that the influence of a high-temperature and high-humidity environment on the sample weighing accuracy is reduced, and the weighing precision is ensured. Moreover, the sample to be tested can be weighed in the test cavity after being treated or tested in the test cavity, and the sample does not need to be transferred, so that the influence or interference of the external environment on the sample in the transfer process is avoided, and the weighing accuracy is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of sample weighing, and in particular to a weighing device. Background Art

[0002] After the sample is processed or tested under a specific test environment, it is often necessary to use a weighing device to weigh the sample. For example, the sample to be weighed needs to be processed or tested under a test environment such as high temperature (the test temperature of some samples needs to reach above 600°C) and high humidity (the test humidity of some samples needs to reach above 90%RH) before being weighed.

[0003] In the related art, when a weighing device weighs a sample, it is easily affected by the test environment, which affects the measurement accuracy. Utility Model Content

[0004] Based on this, it is necessary to provide a weighing device to address the problem of low measurement accuracy of existing weighing devices.

[0005] A weighing device, comprising:

[0006] A housing having a test cavity;

[0007] A supporting unit, located in the test cavity, and used for supporting the sample to be tested;

[0008] A weighing unit, partly located in the test cavity, and used for weighing the sample to be tested;

[0009] A transmission unit, the supporting unit is connected to the transmission unit, and the transmission unit is used to drive the supporting unit to separate from or contact the weighing unit;

[0010] The circulation unit is located in the test chamber and includes an air inlet fan, an exhaust fan and a circulation fan; the air inlet fan is used to introduce external air into the test chamber; the circulation fan is used to make the air flow in the test chamber flow; and the exhaust fan is used to discharge the gas from the test chamber.

[0011] In one of the embodiments, the weighing device further comprises a heat exchange component located in the test cavity, and the heat exchange component is used for performing heat exchange with the test cavity.

[0012] In one of the embodiments, the heat exchange assembly includes a side heat exchange assembly and a bottom heat exchange assembly, the side heat exchange assembly is arranged on the side wall of the test cavity; the bottom heat exchange assembly is arranged on the bottom wall of the test cavity.

[0013] In one embodiment, the side heat exchange assembly and the bottom heat exchange assembly both include a cooling part and a heating part, the cooling part is configured with a flow channel for circulating a cooling medium; the heating part is used to heat the test cavity.

[0014] In one embodiment, the supporting unit includes a sample dish and a sample tray connected to the transmission unit; the sample dish can be separated from the sample tray under the support of the weighing unit.

[0015] In one embodiment, the weighing unit includes a balance and a sample support rod disposed on the balance, and a portion of the sample support rod is located in the test cavity.

[0016] In one embodiment, the weighing device further comprises a sealing member disposed at the balance and the bottom of the test cavity, and a portion of the sample support rod is located within the sealing member.

[0017] In one embodiment, the sealing member is provided with an air pipe interface, the air pipe interface is connected to an air inlet pipe, and the air inlet pipe is used to introduce dry gas;

[0018] The air inlet pipe is provided with a valve for controlling on and off.

[0019] In one embodiment, at least two groups of the weighing units and the supporting units are provided, and each of the weighing units corresponds to one of the supporting units.

[0020] In one embodiment, the weighing device further comprises a furnace cover rotatably connected to the shell, the furnace cover is used to close or open the test cavity, and the furnace cover is provided with an observation glass; and / or

[0021] The outer wall of the test chamber is coated with a heat insulation layer; and / or

[0022] The weighing device further comprises a cooling fan, wherein the cooling fan is located in a transmission cavity of the weighing device; and / or

[0023] The weighing device also includes a running wheel arranged at the bottom of the shell.

[0024] The above-mentioned weighing device forms a circulation in the wind field inside the test chamber through the circulating fan, improves the uniformity of the temperature field inside the test chamber, and ensures the consistency of the sample drying conditions; introduces dry gas or filtered air into the test chamber through the air inlet fan, and discharges the high-humidity air in the test chamber through the exhaust fan, thereby reducing the possibility of condensation inside the test chamber and realizing air replacement inside the test chamber; at the same time, the air inlet fan and the exhaust fan can cool the gas in the test chamber, thereby reducing the influence of the high temperature and high humidity environment on the accuracy of sample weighing, and ensuring the weighing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a weighing device provided in the first embodiment of the present application.

[0026] Figure 2 A schematic diagram of a weighing device provided in the second embodiment of the present application.

[0027] Figure numbers: 10, weighing device; 100, shell; 110, test chamber; 111, thermal insulation layer; 120, transmission chamber; 130, furnace cover; 131, observation glass; 140, walking wheel; 150, leveling foot; 200, supporting unit; 210, sample dish; 220, sample tray; 300, weighing unit; 310, balance; 320, sample support rod; 330, sealing element; 340, air inlet pipe; 350, valve; 400, transmission unit; 500, circulation unit; 510, air inlet fan; 520, exhaust fan; 530, circulation fan; 600, heat exchange component; 610, bottom heat exchange component; 620, side heat exchange component; 630, cooling fan. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] See also Figure 1As shown, a weighing device 10 provided in an embodiment of the present application includes a housing 100, a supporting unit 200, a weighing unit 300, a transmission unit 400 and a circulation unit 500; the housing 100 has a transmission cavity 120 and a test cavity 110; the supporting unit 200 is located in the test cavity 110, and the supporting unit 200 is used to support a sample to be tested; the weighing unit 300 is partially located in the test cavity 110, and the weighing unit 300 is used to weigh the sample to be tested; the supporting unit 200 is connected to the transmission unit 400. The transmission unit 400 is located in the transmission cavity 120, and the transmission unit 400 is used to drive the supporting unit 200 to separate from or contact the weighing unit 300; the circulation unit 500 is located in the test cavity 110, and includes an air intake fan 510, an exhaust fan 520 and a circulation fan 530; the air intake fan 510 is used to introduce external air into the test cavity 110; the circulation fan 530 is used to make the air flow in the test cavity 110 flow; the exhaust fan 520 is used to discharge the gas from the test cavity 110.

[0035] The weighing device 10 mentioned above forms a circulation in the wind field inside the test chamber 110 through the circulation fan 530, improves the uniformity of the temperature field inside the test chamber 110, and ensures the consistency of the sample drying conditions; introduces dry gas or filtered air into the test chamber 110 through the air inlet fan 510, and exhausts the high-humidity air in the test chamber 110 through the exhaust fan 520, thereby reducing the possibility of condensation inside the test chamber 110 and achieving air replacement inside the test chamber 110; at the same time, the air inlet fan 510 and the exhaust fan 520 can cool the gas in the test chamber 110, thereby reducing the influence of the high temperature and high humidity environment on the accuracy of sample weighing and ensuring the weighing accuracy. In addition, the sample to be tested can be weighed in the test chamber 110 after being processed or tested in the test chamber 110, without the need to transfer the sample, thereby avoiding the influence or interference of the external environment on the sample during the transfer process, and ensuring the accuracy of weighing.

[0036] See also Figure 1 As shown, in one embodiment, the weighing device 10 further includes a heat exchange component 600 located in the test cavity 110, and the heat exchange component 600 is used to perform heat exchange with the test cavity 110. By performing heat exchange between the heat exchange component 600 and the air in the test cavity 110, the test cavity 110 can be quickly heated to the experimental temperature, or cooled to the weighing temperature, etc., thereby improving the weighing efficiency.

[0037] See also Figure 1As shown, in one embodiment, the heat exchange assembly 600 includes a side heat exchange assembly 620 and a bottom heat exchange assembly 610, wherein the side heat exchange assembly 620 is disposed on the side wall of the test cavity 110; and the bottom heat exchange assembly 610 is disposed on the bottom wall of the test cavity 110. By arranging the heat exchange assembly 600 at multiple positions, the heat exchange efficiency is improved, thereby improving the drying efficiency.

[0038] See also Figure 1 As shown, in one embodiment, the side heat exchange assembly 620 and the bottom heat exchange assembly 610 both include a cooling part and a heating part, and the heating part is used to heat the air in the test chamber 110 so that the sample to be tested is heated and dried. The cooling part is configured with a flow channel for the circulation of a cooling medium, that is, the cooling part can be water-cooled; the cooling part is used to cool the sample to be tested, so that the sample to be tested can quickly meet the weighing requirements, thereby improving the weighing efficiency.

[0039] Among them, the cooling part and the heating part can be separate components that are bonded together and integrated into one, and the start and stop of the two are controlled separately; or the cooling part and the heating part can be split, that is, the two are separately bonded or embedded on the inner wall of the test cavity 110, or suspended in the test cavity 110, as long as the heat exchange effect can be achieved. Among them, the heating part can be a heating tube, and the cooling part can be a cold plate or other structure. Furthermore, a temperature measuring element such as a temperature sensor can be arranged in the test cavity 110 to detect the temperature in the test cavity 110 in real time to ensure that the temperature in the test cavity 110 does not exceed a preset range.

[0040] See also Figure 2 As shown, the weighing device 10 further includes a cooling fan 630, which is located in the transmission cavity 120 of the weighing device 10. The cooling fan 630 is used to ventilate and dissipate heat in the transmission cavity 120 to ensure the reliability of the transmission unit 400. The outer wall of the test cavity 110 is coated with a heat insulation layer 111 to prevent the temperature of the transmission cavity 120 from transferring heat to the temperature of the test cavity 110, thereby ensuring the temperature stability inside the test cavity 110.

[0041] See also Figure 1As shown, in one embodiment, the supporting unit 200 includes a sample dish 210 and a sample tray 220 connected to the transmission unit 400; the transmission unit 400 drives the sample tray 220 to descend, so that the sample dish 210 can overlap on the weighing unit 300, and as the transmission unit 400 drives the sample tray 220 to continue to descend, the sample tray 220 will gradually separate from the sample dish 210, so that the sample dish 210 is transferred to the weighing unit 300. The sample dish 210 and the sample tray 220 are matched with conical inclined surfaces, which facilitates the separation of the sample dish 210 from the sample tray 220; and the top of the sample dish 210 can overlap on the sample tray 220, so that the sample dish 210 is transferred to the sample tray 220. Among them, the transmission unit 400 includes a transmission shaft, and the transmission shaft is rigidly connected to the sample tray 220, so that the sample tray 220 is driven to move by the transmission shaft. The transmission shaft can be a single shaft connected between the sample tray 220 and the transmission unit 400. Of course, the transmission shaft can also be composed of multiple shafts spliced ​​in sections.

[0042] In some embodiments, the transmission unit 400 may include a hydraulic cylinder, a pneumatic cylinder or other lifting drive unit with a lifting function, so that the sample tray 220 can rise or fall; the transmission unit 400 may also include a rotating drive unit with a rotating function such as a motor, so that the sample tray 220 rotates, thereby transferring the sample dish 210 to the next workstation.

[0043] See also Figure 1 As shown, in one embodiment, the weighing unit 300 includes a balance 310 and a sample support rod 320 disposed on the balance 310, a portion of the sample support rod 320 is located in the test cavity 110, and the balance 310 is located in the transmission cavity 120. The sample support rod 320 is connected or separated from the sample dish 210 to achieve the weighing operation. The sample support rod 320 can be made of ceramic or other heat-insulating materials to avoid heat transfer to the balance 310. In other embodiments, the weighing unit 300 can also be a component or element such as a weighing sensor that can weigh an object.

[0044] See also Figure 2 As shown, in one embodiment, the weighing device 10 further includes a seal 330 disposed at the bottom of the balance 310 and the test cavity 110, and a portion of the sample support rod 320 is located in the seal 330. By providing the seal 330, the test cavity 110 is isolated from the transmission cavity 120, thereby ensuring the sealing performance of the test cavity 110. The sample support rod 320 is made of a material with a low thermal conductivity, such as zirconia ceramics, and the sample support rod 320 can be connected to the balance 310 with a small contact area and thermal insulation.

[0045] See also Figure 2As shown, in one embodiment, a trachea interface is provided on the sealing member 330, and the trachea interface is connected to an air inlet pipe 340, and the air inlet pipe 340 is used to introduce dry gas such as dry air, nitrogen or inert gas; the trachea interface is used to pass dry gas to form a gas flexible seal to prevent the high temperature and high humidity gas inside the test cavity 110 from contacting the balance 310, thereby protecting the balance 310, and preventing the measurement result of the balance 310 from being disturbed by the experimental environment, thereby improving the measurement accuracy of the balance 310.

[0046] See also Figure 2 As shown, the air inlet pipe 340 is provided with a valve 350 for controlling the on-off. The valve 350 may be a solenoid valve, through which the on-off of the dry gas is controlled. When weighing, the solenoid valve is closed, that is, the dry gas is stopped from entering, so that the test chamber 110 forms a closed test chamber 110.

[0047] See also Figure 2 As shown, in one embodiment, at least two groups of the weighing units 300 and the supporting units 200 are provided, and each weighing unit 300 corresponds to one supporting unit 200. Specifically, a plurality of circles of sample dishes 210 are provided on the sample tray 220, for example, the inner circle and the outer circle of the sample tray 220 are both provided with sample dishes 210, and the inner circle and the outer circle are respectively provided with balances 310, so that two groups of samples can be weighed at the same time, thereby improving the weighing efficiency.

[0048] See also Figure 2 As shown, in one embodiment, the weighing device 10 further includes a furnace cover 130 rotatably connected to the housing 100, and the furnace cover 130 is used to close or open the test chamber 110. Specifically, the furnace cover 130 is hinged on the housing 100, and can conveniently take out and place the sample dish 210. Furthermore, the furnace cover 130 is provided with an observation glass 131, which has heat insulation and visibility, and is used for the experimenter to observe the sample dish 210.

[0049] See also Figure 2 As shown, in some embodiments, the weighing device 10 further includes a running wheel 140 disposed at the bottom of the housing 100. Through the running wheel 140, the experimenter can transport the weighing device 10 to other places, thereby improving the convenience of the weighing operation. Furthermore, a leveling foot 150 is also provided at the bottom of the housing 100, through which the leveling foot 150 can be used to adjust the level of the entire device to ensure the reliability of the weighing result.

[0050] In one embodiment, a water bath (not shown) may be provided at the bottom of the test chamber 110, and water may be filled or drained inside the water bath. When there is no heating part at the bottom, the water heating rod may be directly immersed in the water to heat the water directly; when a heating part is provided at the bottom, the water bath may be attached to the heating part, and the heating rod immersed in the water may be retained or removed, so that the weighing device 10 may be transformed into a water bath weighing device 10 with a water bath function, which is suitable for samples that need to be dried in a water bath. The water inside the water bath may be water heated externally and injected into the water bath, which can speed up the experimental efficiency.

[0051] For the weighing device 10, at the beginning of the experiment, the furnace cover 130 of the test chamber 110 is opened, the empty sample dish 210 is placed on the sample tray 220 according to the number, the furnace cover 130 of the test chamber is closed, and the heating part is used for heating; at the same time, the internal circulation fan 530 of the test chamber 110 is turned on to circulate the heat inside the cavity of the test chamber 110, so that the inside of the test chamber 110 is heated to the drying temperature; at the same time, the solenoid valve is turned on, and the dry air is blown out through the air pipe interface to isolate the hot air from contacting the balance 310. After a specified time, the temperature is lowered through the fluid pipeline inside the cooling part, and the circulation fan 530 of the test chamber 110 is turned on to circulate the heat inside the cavity of the test chamber 110, and the inside of the test chamber 110 is cooled to the required temperature.

[0052] Next, the transmission unit 400 controls the sample tray 220 to drive the sample dish 210 to rise and fall and rotate, closes the solenoid valve, and places the dried empty sample dishes 210 one by one on the sample support rod 320. After the weighing is stable, the data of the balance 310 is read to end the weighing.

[0053] Further, the furnace cover 130 of the test chamber 110 is opened, and the experimental sample is placed in the corresponding sample dish 210, and the furnace cover 130 of the test chamber is closed. The transmission unit 400 controls the sample tray 220 to descend, and heat is emitted through the heating part, and the sample dish 210 is heated and dried. The circulation fan 530 of the test chamber 110 is turned on to circulate the heat inside the cavity of the test chamber 110, and the exhaust fan 520 is turned on to blow the filtered dry air into the cavity of the test chamber 110 to replace the internal air and dry it to the experimental requirements.

[0054] Then, the above-mentioned drying step and weighing step are repeated until the sample dish 210 has a constant weight.

[0055] Among them, if the difference between the current weighing value and the previous weighing value is within the preset difference range, the current weighing value is considered to be the constant weight value of the sample; if the difference between the current weighing value and the previous weighing value is not within the preset difference range, the heat exchange component 600 is repeatedly used for heating and then cooling and weighing is performed using a weighing element until the difference between the current weighing value and the previous weighing value is within the preset difference range, and the weighing value of the next weighing is considered to be the constant weight value of the sample.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A weighing device, characterized in that: The weighing device comprises: A housing (100) having a test cavity (110); A supporting unit (200), located in the test cavity (110), the supporting unit (200) being used to support a sample to be tested; A weighing unit (300), partly located in the test cavity (110), the weighing unit (300) being used to weigh a sample to be tested; a transmission unit (400), the supporting unit (200) being connected to the transmission unit (400), the transmission unit (400) being used to drive the supporting unit (200) to separate from or contact the weighing unit (300); A circulation unit (500) is located in the test chamber (110), and comprises an air intake fan (510), an air exhaust fan (520) and a circulation fan (530); the air intake fan (510) is used to introduce external air into the test chamber (110); the circulation fan (530) is used to make the air flow in the test chamber (110) flow; and the air exhaust fan (520) is used to exhaust the air from the test chamber (110).

2. The weighing device according to claim 1, characterized in that: The weighing device further comprises a heat exchange component (600) located in the test cavity (110), wherein the heat exchange component (600) is used to perform heat exchange with the test cavity (110).

3. The weighing device according to claim 2, characterized in that: The heat exchange component (600) comprises a side heat exchange component (620) and a bottom heat exchange component (610); the side heat exchange component (620) is arranged on the side wall of the test cavity (110); and the bottom heat exchange component (610) is arranged on the bottom wall of the test cavity (110).

4. The weighing device according to claim 3, characterized in that: The side heat exchange assembly (620) and the bottom heat exchange assembly (610) both comprise a cooling portion and a heating portion, the cooling portion being configured with a flow channel for the circulation of a cooling medium; the heating portion being used to heat the test cavity (110).

5. The weighing device according to claim 1, characterized in that: The supporting unit (200) comprises a sample dish (210) and a sample plate (220) connected to the transmission unit (400); the sample dish (210) can be separated from the sample plate (220) under the support of the weighing unit (300).

6. The weighing device according to claim 5, characterized in that: The weighing unit (300) comprises a balance (310) and a sample support rod (320) arranged on the balance (310), and a portion of the sample support rod (320) is located in the test cavity (110).

7. The weighing device according to claim 6, characterized in that: The weighing device further comprises a sealing member (330) arranged at the bottom of the balance (310) and the test cavity (110), and a portion of the sample support rod (320) is located within the sealing member (330).

8. The weighing device according to claim 7, characterized in that: The sealing member (330) is provided with an air pipe interface, the air pipe interface is connected to an air inlet pipe (340), and the air inlet pipe (340) is used to introduce dry gas; The air inlet pipe (340) is provided with a valve (350) for controlling on and off.

9. The weighing device according to claim 1, characterized in that: At least two groups of the weighing units (300) and the supporting units (200) are provided, and each weighing unit (300) corresponds to one supporting unit (200) on a one-to-one basis.

10. The weighing device according to claim 1, characterized in that: The weighing device further comprises a furnace cover (130) rotatably connected to the housing (100), the furnace cover (130) being used to close or open the test cavity (110), and an observation glass (131) being provided on the furnace cover (130); and / or The outer wall of the test chamber (110) is coated with a heat insulation layer (111); and / or The weighing device further comprises a cooling fan (630), wherein the cooling fan (630) is located in the transmission cavity (120) of the weighing device; and / or The weighing device further comprises a running wheel (140) arranged at the bottom of the housing (100).

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