Apparatus and method for automatically preparing equilibrium moisture coal samples

Abstract

The present invention relates to an apparatus and method for automatically preparing equilibrium moisture coal samples. The apparatus comprises a thermostatic box (15), a partition plate (14), a sample stage (7), a measuring bearing (3), an electronic balance (1), an evaporation tank (10), and a control circuit board (18). The upper part of the thermostatic box (15) defines an equilibrium moisture chamber (151) via the partition plate (14), the evaporation tank (10) and the sample stage (7) are disposed within the equilibrium moisture chamber (151), and the electronic balance (1) is disposed below the partition plate (14). A hole (141) is provided in the center of the partition plate (14). A part of the measuring bearing (3) passes through the hole (141), and the top part is connected to the sample stage (7), and the bottom part is connected to the electronic balance (1). The thermostatic box (15) and the electronic balance (1) are each electrically connected to a control circuit board (18), which sets the temperature and collects data, and calculates and presents the equilibrium moisture result based on the collected data.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application bearing application number 202210851299.6, entitled "Automatic preparation apparatus and preparation method for equilibrium moisture coal samples," filed with the China Patent Office on July 19, 2022, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to the field of coal seam gas, particularly but not exclusively, to an apparatus and method for the automated preparation of equilibrium moisture coal samples. [Background technology]

[0003] Coal seam gas is an unconventional natural gas that coexists with coal and is stored in coal seams mainly in an adsorbed state, and its main component is methane. China has abundant reserves of coal seam gas resources, its calorific value is equivalent to that of natural gas, and its combustion products are clean, so it is of great significance to energy, coal mine safety, and environmental protection. In recent years, the development of the coal seam gas industry has made rapid progress.

[0004] In the process of coal seam gas exploration and development, isothermal adsorption test is one of the most important laboratory experiments, which uses equilibrium moisture coal sample to generate gas and adsorption action at a certain pressure in the sample chamber, measure the gas adsorption amount, draw an adsorption curve with increasing gas pressure, and calculate the theoretical maximum adsorption amount based on the adsorption equation. This experiment can be used for estimating reserves, estimating recoverable amount, etc. Therefore, preparing equilibrium moisture coal sample for the experiment is an important part of the experiment. Summary of the Invention

[0005] The following is a summary of the subject matter described in detail in the present text, which is not intended to limit the scope of protection of the claims.

[0006] Embodiments of the present disclosure provide an apparatus and method for automatically preparing equilibrium moisture coal samples.

[0007] In one aspect, an embodiment of the present disclosure provides an apparatus for automatically preparing an equilibrium moisture coal sample, the apparatus comprising: a thermostatic box, a partition plate, a sample stage, a weighing bearing, an electronic balance, an evaporation tank, and a control circuit board; The upper part of the thermostatic box is partitioned into an equilibrium moisture chamber via a partition plate, the evaporation tank and the sample stage are placed in the equilibrium moisture chamber, and the electronic balance is placed below the partition plate. a hole is provided in the center of the partition plate, a part of the measuring bearing passes through the hole, a top of the measuring bearing is connected to the sample stage, and a bottom of the measuring bearing is connected to the electronic balance; The thermostatic box and the electronic balance are each electrically connected to a control circuit board, which sets the temperature and collects data, and calculates and presents the equilibrium moisture result based on the collected data.

[0008] In one exemplary embodiment, the device further comprises a water level warning sensor, the water level warning sensor being submerged and disposed within the evaporation tank and connected to the control circuit board.

[0009] In one exemplary embodiment, the sample stage is provided with a sample tray, the size of the sample stage is larger than the size of the sample tray, and a baffle plate is provided at the edge of the sample stage.

[0010] In one exemplary embodiment, the equilibrium moisture chamber is provided with a hatch door, and the hatch door is provided with a transparent observation window through which the water level in the evaporation tank can be observed.

[0011] In one exemplary embodiment, the hatch door is provided with a handle that locks up into the housing connection port of the thermostatic box when closed, and further includes a sealing strip attached to the inner outer edge of the hatch door.

[0012] In one exemplary embodiment, the top of the weighing bearing is fixedly connected to the sample stage, and the bottom of the weighing bearing is placed on the electronic balance via the counterweight base and contact-connected to the electronic balance.

[0013] In one exemplary embodiment, a high-temperature resistant silica gel disk is further provided that is sealed and connected to the hole of the partition plate, a segment with a reduced diameter is provided at the portion of the metering bearing that passes through the hole of the partition plate, and a through hole having a hole diameter smaller than the diameter of the segment is provided in the center of the high-temperature resistant silica gel disk, and the high-temperature resistant silica gel disk is nested in the segment of the metering bearing during installation.

[0014] In one exemplary embodiment, the evaporation tanks are made of a transparent material, have an open top, and are arranged uniformly at various locations within the equilibrium moisture chamber.

[0015] In one exemplary embodiment, the device further comprises a control button, an indicator light, a display, and / or a printing device connected to the control circuit board; The control buttons include a weighing tray button, a sample preparation start button, and a preliminary weighing button; The indicator lights include a preparation indicator light, a preparation completion indicator light, and a water level abnormality indicator light. The display shows the initial sample mass, previous weighed mass, current weighed mass and mass change rate. The printing device is used to realize note printing of the measurement data.

[0016] In another aspect, embodiments of the present disclosure provide a method for automated preparation of equilibrium moisture coal samples, carried out using an automated preparation apparatus as described in any one of the embodiments above, the method comprising: Starting the automatic preparation device, setting the equilibrium temperature of the thermostatic box, and adding a certain amount of potassium sulfate supersaturated solution into the evaporation tank until the automatic preparation device becomes stable; Before placing the coal sample, weigh the current mass m0 of the sample stage; Prepare a coal sample with a particle size of 0.18 mm to 0.25 mm, weigh a coal sample of 35 g or more after air drying, place the coal sample on a sample stage, add an appropriate amount of distilled water evenly, and collect mass data of the electronic balance at a time interval preset by a control circuit board; The rate of mass change of the coal sample calculated by the control circuit board reaches a preset condition indicating completion of preparation of the equilibrium moisture coal sample.

[0017] Other aspects will be understood after reading and understanding the drawings and detailed description. [Brief description of the drawings]

[0018] The drawings are intended to provide an understanding of the technical solution of the present disclosure, to be a part of the specification, and to interpret the technical solution of the present disclosure together with the embodiments of the present disclosure, and are not intended to limit the technical solution of the present disclosure. The shape and size of one or more parts in the drawings do not reflect actual proportions, and are intended to diagrammatically explain the contents of the present disclosure.

[0019] [Figure 1] FIG. 1 is a structural schematic diagram of an automatic equilibrium moisture coal sample preparation device according to an embodiment of the present application. [Diagram 2] FIG. 2 is a schematic diagram showing the appearance of the automatic equilibrium moisture coal sample preparation device shown in FIG. 1. [Diagram 3] FIG. 2 is a schematic diagram of the high-temperature resistant silica gel disk of the automatic equilibrium moisture coal sample preparation apparatus shown in FIG. [Figure 4] FIG. 2 is a schematic diagram of a circular flange gasket of the automatic equilibrium moisture coal sample preparation apparatus shown in FIG. 1. [Diagram 5] 1 is a flow chart of a method for preparing equilibrium moisture coal samples according to one embodiment of the present application.

[0020] Drawing symbols 1 electronic balance, 2 counterweight base, 3 weighing bearing, 4 high temperature resistant silica gel disk, 41 through hole, 5 circular flange gasket, 6 bolt, 7 sample table, 71 baffle plate, 8 sample tray, 9 coal sample, 10 evaporation tank, 11 distilled water, 12 potassium sulfate, 13 water level alarm sensor, 14 partition plate, 141 hole, 15 thermostatic box, 150 storage cavity, 151 equilibrium moisture chamber, 16 control panel, 17 thermostatic box switch, 18 control circuit board, 31 device switch, 32 weighing tray button, 33 sample preparation start button, 34 provisional weighing button, 35 preparation in progress indicator, 36 preparation completion indicator, 37 water level abnormality indicator, 38 display, 39 printing device, 40 transparent observation window, 41 handle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiments may be implemented in many different forms. As can be easily understood by those skilled in the art, the manner and content may be converted into one or more forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited only to the description of the following embodiments. If there is no conflict, the embodiments and features of the embodiments of the present disclosure may be combined with each other.

[0022] In the drawings, the size, thickness or area of ​​one or more components may be enlarged for clarity. Therefore, one embodiment of the present disclosure is not limited to the size, and the shape and size of one or more parts in the drawings do not reflect actual proportions. In addition, the drawings are schematic illustrations of ideal examples, and one embodiment of the present disclosure is not limited to the shapes or numerical values ​​shown in the drawings.

[0023] In this disclosure, ordinal numbers such as "first," "second," and "third" are used to avoid confusion of components and are not intended to limit the quantity. In this disclosure, "plurality" includes two or more.

[0024] In this disclosure, for convenience, the positions of components are described with reference to the drawings using terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. However, this is for the purpose of explaining and simplifying the present specification, and is not intended to indicate or suggest that the described device or element has a specific orientation and must be configured and operated in a specific orientation. Therefore, it is not intended to limit the present disclosure. The positional relationship of the components is appropriately changed depending on the direction in which the components are described. Therefore, it is not limited to the terms described in the specification, and may be appropriately changed in some cases.

[0025] In the present disclosure, unless otherwise specified and limited, the terms "attached", "coupled" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection via a linker, or an internal communication between two elements. Those skilled in the art can understand the meaning of the above terms in the present disclosure according to the specific situation.

[0026] In this disclosure, "electrical connection" includes cases where components are connected via an element having a certain electrical function. The "element having a certain electrical function" is not particularly limited as long as it can transmit an electrical signal between the connected components.

[0027] The technical idea of ​​the present disclosure is as follows: a thermostatic box is used to set up an equilibrium moisture chamber with a stable environment, an evaporation tank and a sample stage are provided in the equilibrium moisture chamber to achieve moisture adsorption equilibrium of the coal sample, and a weighing bearing, an electronic balance and a control circuit board are used to automatically measure the mass data of the coal sample, improving the manufacturing efficiency and avoiding the complicated process of manual operation and measurement errors caused by the coal sample being exposed to an external dry air environment during the weighing process.

[0028] 1 to 4, an embodiment of the present application provides an apparatus for automatically preparing an equilibrium moisture coal sample, and the apparatus may include a thermostatic box 15, a partition plate 14, a sample stage 7, a measuring bearing 3, an electronic balance 1, an evaporation tank 10, and a control circuit board 18. In the embodiment of the present application, the apparatus for automatically preparing an equilibrium moisture coal sample is simply referred to as the apparatus.

[0029] 1, a storage cavity 150 is provided in the thermostatic box 15, and the partition plate 14 is located in the storage cavity 150. The partition plate 14 divides the storage cavity 150 into an equilibrium moisture chamber 151, and the equilibrium moisture chamber 151 is located in the upper part of the thermostatic box 15. The evaporation tank 10 and the sample stage 7 are located in the equilibrium moisture chamber 151, and the electronic balance 1 is located in the storage cavity 150 below the partition plate 14.

[0030] 1 , the partition plate 14 is provided with a hole 141, and for example, the hole 141 may be located in the center of the partition plate 14. The metering bearing 3 is located in the accommodating cavity 150, a part of the metering bearing 3 is located below the partition plate 14, a part of the metering bearing 3 passes through the hole 141 and is located in the equilibrium moisture chamber 151, the part of the metering bearing 3 located in the equilibrium moisture chamber 151 is connected to the sample stage 7, the part of the metering bearing 3 located below the partition plate 14 is connected to the electronic balance 1, and the electronic balance 1 can measure the mass of the coal sample 9 on the sample stage 7.

[0031] The thermostatic box 15 and the electronic balance 1 may be electrically connected to the control circuit board 18, respectively. The control circuit board 18 may be applicable to control the temperature of the thermostatic box 15 and collect data of the electronic balance 1, and may calculate and present the equilibrium moisture result based on the collected data. Exemplarily, the control circuit board 18 may be electrically connected to a signal collection card, and the control circuit board 18 may collect data of the electronic balance 1 through the signal collection card, and calculate the mass change rate of the coal sample 9 from the data collected multiple times. Exemplarily, when the mass change rate of the coal sample 9 reaches a preset condition, for example, the preset condition is 2%, it indicates that the adsorbed moisture of the coal sample 9 has reached balance, and the control circuit board 18 issues a notification to notify the user that the preparation of the equilibrium moisture coal sample is completed, and the preparation process can be realized automatically, eliminating the need for manual weighing, and improving the preparation efficiency of the equilibrium moisture coal sample. In the embodiment of the present application, the preset condition of 2% is illustrative, and the preset condition of the mass change rate of the coal sample is not limited.

[0032] The automatic equilibrium moisture coal sample preparation device according to the embodiment of the present application can realize the automatic preparation of equilibrium moisture coal samples, and the process of equilibrium moisture of coal samples does not require human supervision, and the manual operations of weighing, adding liquid and the like are greatly reduced, the efficiency of preparation of equilibrium moisture coal samples is improved, and the accuracy of sample preparation results is high.

[0033] In one embodiment of the present application, as shown in FIG. 1, the device may further include a water level warning sensor 13, which may be submerged and installed in the evaporation tank 10 and connected to the control circuit board 18.

[0034] In one embodiment of the present invention, the material of the evaporation tank 10 may be transparent, and the side of the evaporation tank 10 away from the partition plate 14 may be designed to have an opening so that the evaporation material can contact the coal sample. The apparatus may include a plurality of evaporation tanks 10, and the plurality of evaporation tanks 10 may be evenly distributed in the equilibrium moisture chamber 151. For example, as shown in FIG. 1, the evaporation tank 10 may be a rectangular parallelepiped, and the apparatus may include two evaporation tanks 10, which are located on both sides of the metering bearing 3, and may be symmetrically distributed with respect to the metering bearing 3. The heights of the two evaporation tanks 10 may be the same, and a uniform humidity environment can be provided. Each evaporation tank 10 may be provided with a water level alarm sensor 13. When one of the plurality of water level alarm sensors 13 detects a lack of water level, a water level abnormality alarm can be turned on to avoid the evaporation drying problem in the sample preparation process. In the embodiment of the present application, the height is the size along the vertical direction.

[0035] 1, a sample tray 8 for placing a coal sample 9 on the sample stage 7 may be installed. The size of the sample stage 7 may be larger than that of the sample tray 8, and a baffle plate 71 may be provided on an edge of the sample stage 7 to increase the stability of the sample tray 8.

[0036] In one exemplary embodiment, as shown in Fig. 2, the apparatus may include a hatch door attached to the equilibrium moisture chamber 151, and a transparent observation window 40 is provided in the hatch door, through which the water level in the evaporation tank 10 can be observed, thereby improving the visibility of the apparatus. As shown in Fig. 2, the hatch door may be provided as a horizontal hatch door that can be opened and closed in the left and right directions, and the hatch door may be connected to the housing of the thermostatic box 15 via a bearing.

[0037] In one exemplary embodiment, as shown in Fig. 2, the device may include a handle 41, which is provided on the hatch door and can be locked up to the housing of the thermostatic box 15 when the hatch door is closed. A sealing strip may be provided on the inner outer edge of the hatch door, which can improve the sealing effect and maintain the stability of the temperature, humidity, etc. of the environment in which the coal sample is placed. The inner side of the hatch door is the side close to the receiving cavity, and the outer edge of the hatch door is the side excluding the side where the hatch door bearing is provided.

[0038] 1, the top (upper part) of the weighing bearing 3 may be fixedly connected to the sample stage 7, and the bottom (lower part) of the weighing bearing 3 may be placed on the electronic balance 1 via the counterweight base 2 and contact-connected to the electronic balance 1. When the coal sample 9 located on the sample stage 7 adsorbs moisture and a mass change occurs, the electronic balance 1 can obtain mass data of the coal sample 9 at any time.

[0039] In an exemplary embodiment, as shown in FIG. 1 and FIG. 3, the device may further include a high-temperature resistant silica gel disk 4, the high-temperature resistant silica gel disk 4 is located on one side of the partition plate 14, and the high-temperature resistant silica gel disk 4 is located in the equilibrium moisture chamber 151, as shown in FIG. 1. The high-temperature resistant silica gel disk 4 is used to seal the hole 141. Exemplarily, the portion of the metering bearing 3 that penetrates the hole 141 of the partition plate 14 may be provided with a segment with a reduced diameter, and as shown in FIG. 3, the high-temperature resistant silica gel disk 4 may be provided with a through hole 41 with a hole diameter smaller than the diameter of the segment. When installed, the high-temperature resistant silica gel disk 4 can be nested in the segment of the metering bearing 3, and the through hole 41 can be aligned with the segment of the metering bearing 3. The high-temperature resistant silica gel disk 4 can enhance the isolation effect of the equilibrium moisture chamber 151 and maintain the stability of the temperature and humidity in the room.

[0040] In one exemplary embodiment, the partition plate 14 may be a metal plate, illustratively a stainless steel metal plate having good strength and corrosion resistance.

[0041] In one exemplary embodiment, the hole diameter of the hole 141 located in the partition plate 14 may be larger than the diameter of the metering bearing 3, so as to avoid rubbing the metering bearing 3 and causing errors.

[0042] In one exemplary embodiment, as shown in Fig. 1, the high-temperature resistant silica gel disk 4 may be sealingly connected to the partition plate 14 via a circular flange gasket 5 and a bolt 6. As shown in Fig. 4, the circular flange gasket 5 may be a holed disk of uniform thickness, and the diameter of the central hole of the circular flange gasket 5 may be larger than the diameter of the metering bearing 3.

[0043] 1-2, in one exemplary embodiment, the device may further include a control button, an indicator light, a display 38, and a printing device 39 connected to the control circuit board 18. Alternatively, the device may further include a control button, an indicator light, and a printing device 39 connected to the control circuit board 18. The control button, the indicator light, the display, and the printing device may be used to assist the switch control, indication, display, and recording operations of the control circuit board.

[0044] For example, the display and printing device may be located on the lower outside of the device, and the control circuit board 18 may be mounted inside the device, or as shown in FIG. 1, the control circuit board 18 may be located within the receiving cavity 150 and below the divider plate 14.

[0045] 2, the control buttons may include a weighing tray button 32, a sample preparation start button 33, and a temporary weighing button 34. An apparatus switch 31 may be provided around the control buttons, and the electronic balance 1 may be located at the bottom (lower) of the apparatus, and data may be collected by the control circuit board 18 via a signal collection card, and the power supply of the electronic balance may be linked and controlled via the apparatus switch 31.

[0046] 2, the indicator lights may include a preparation in progress indicator light 35, a preparation complete indicator light 36, and a water level abnormality indicator light 37. Exemplarily, the preparation in progress indicator light 35 may be yellow, the preparation complete indicator light 36 may be green, and the water level abnormality indicator light 37 may be red, and different colors make it easy to recognize different states.

[0047] In one exemplary embodiment, the display 38 may be used to display the initial sample mass, the previously weighed mass, the currently weighed mass, and the rate of mass change.

[0048] In one exemplary embodiment, the printing device 39 may be used to facilitate note printing of the metric data.

[0049] In one exemplary embodiment, as shown in Fig. 1, the bottom (lower part) of the thermostatic box 15 may be provided with a control panel 16 of the thermostatic box 15 and a thermostatic box switch 17 for turning on the thermostatic box 15. The heating tube and the air outlet of the thermostatic box may both be located inside the bottom.

[0050] An embodiment of the present application discloses a method for automatically preparing an equilibrium moisture coal sample, which is carried out using the automatic preparation device described in any of the above embodiments, and as shown in FIG. 5, the method may include: The automatic preparation device is started, the equilibrium temperature of the thermostatic box is set, and a certain amount of potassium sulfate supersaturated solution is added into the evaporation tank until the automatic preparation device becomes stable. Before placing the coal sample, the current mass of the sample stage is weighed and recorded as m0. Prepare coal samples with particle sizes between 0.18 mm and 0.25 mm, weigh coal samples of 35 g or more after air drying, place the coal samples on the sample stage, add a certain amount of distilled water evenly, and collect mass data on the electronic balance at time intervals preset by the control circuit board. The reaching of the preset condition of the mass change rate of the coal sample calculated by the control circuit board indicates the completion of the preparation of the equilibrium moisture coal sample.

[0051] The operation procedure will be described with reference to FIGS. First, the device switch 31 of the device is operated, the thermostatic box switch 17 is operated, the temperature is set to the experimental temperature via the control panel 16, and a certain amount of potassium sulfate 12 and distilled water 11 is added to the evaporation tank 10 to prepare a supersaturated solution, and the device is allowed to stabilize. The certain amount may be determined according to the volume of the evaporation tank 10, and may be, for example, 90% of the volume of the evaporation tank 10. Then, the sample tray 8 is placed on the sample stage 7, the weighing tray button 32 is pressed, and the control circuit board 18 collects the current mass of the electronic balance 1 and records it as m0. Then, a coal sample with a grain size of 0.18 mm to 0.25 mm is collected, and for example, a 200 g coal sample is collected, and after air drying, 35 g or more of the coal sample is weighed, and the coal sample 9 is placed in the sample tray 8, and an appropriate amount of distilled water is added uniformly. Furthermore, the sample tray 8 on which the coal sample 9 is placed is placed on the sample stage 7, and the sample preparation start button 33 is pressed. The control circuit board 18 collects the mass that is measured for the first time, records it as m1, starts timing, and turns on the preparation indicator light 35. The control circuit board 18 calculates the initial mass of the coal sample as m_initial=m1-m0, displays the initial mass at the position of the initial sample mass on the display 38, and prints the initial mass using the printer 39.

[0052] The above operation is a process in which the apparatus operates automatically until the sample preparation is completed, and does not require any manual operation. In the embodiment of the present application, a process in which the apparatus automatically calculates the mass change rate of a coal sample will be described as a representative example.

[0053] The supersaturated solution in the evaporation tank 10 is heated in the thermostatic box 15, and the moisture evaporates into the equilibrium moisture chamber 151, and the coal sample 9 absorbs the moisture. Every time the control circuit board 18 times 24 hours, the control circuit board 18 collects the current mass, records it as m2, calculates the current sample mass as m_now=m2-m0, and displays the current sample mass in the currently weighed mass position on the display 38. The control circuit board 18 calculates the previous sample mass, records it as m_pre=m1-m0, and displays the previous sample mass in the previous sample mass position on the display 38.

[0054] The control circuit board 18 calculates the mass change rate using the following formula.

[0055] △m=|(m2-m1)| / (m1-m0)*100%

[0056] The control circuit board 18 may display the mass change rate Δm at the mass change rate position on the display 38, and may print the current timing, the current sample mass, and the mass change rate using a printer 39.

[0057] For example, if the mass change rate Δm is less than 2%, this indicates that the preparation of the equilibrium moisture coal sample is complete, and the preparation in progress indicator light 35 goes out and the preparation complete indicator light 36 goes on. If the mass change rate Δm is 2% or more, the control circuit board 18 stores the m2 data in the m1 position, and after the next period of 24 hours has arrived, it repeats the above process of weighing and calculating until the mass change rate Δm becomes less than 2%.

[0058] In one exemplary embodiment, the preparation method of the present embodiment may further include a preliminary weighing step.

[0059] When the temporary weighing button 34 is pressed, the control circuit board 18 collects the temporary weighing mass m3, calculates the temporary sample mass, records m_tem=m3-m0, displays the temporary sample mass in the position of the temporary weighing mass on the display 38, and calculates the mass change rate. The calculation formula is as follows:

[0060] △m=|(m3-m1)| / (m1-m0)*100%

[0061] The control circuit board 18 can display the mass change rate Δm at the mass change rate position on the display 38, which makes it easy for the sample creator to check the progress of sample creation in real time.

[0062] As described above, by applying the apparatus and method according to the embodiment of the present application, the coal sample is always placed in the apparatus to absorb moisture, and does not need to be taken out during the weighing process. During the sample preparation process, the coal sample does not come into direct contact with the external air environment, so that the efficiency of sample preparation can be improved and the interference of the external environment can be reduced. The apparatus according to the embodiment of the present application can automatically determine the completion of sample preparation, present the mass of the sample, and continue to maintain the humidity environment of the sample. Before taking out the sample, the user can press the provisional measurement button to obtain the current mass, which can be substituted into the calculation of the subsequent experiment, which contributes to the development and design of the experiment and reduces the interference of the environment on the test results. In addition, the apparatus is equipped with a supersaturated solution evaporation tank, and the water level can be easily observed through the transparent observation window of the hatch door and the transparent evaporation tank, which can be combined with a water level alarm sensor to provide advance notification of a lack of water level, thereby reducing the occurrence of sample preparation failure. As can be seen from this, after the operation of the apparatus is started, no manual operation is required during normal operation, and the work efficiency of the test can be improved.

[0063] The above is an embodiment disclosed in the present invention, but the above content is an embodiment used to facilitate understanding of the present invention, and is not intended to limit the present invention. Note that the above examples or embodiments are illustrative and not restrictive. Therefore, the present disclosure is not limited to the content specifically shown and described herein. Various changes, substitutions, or omissions can be made to the embodiments and details without departing from the scope of the present disclosure.

Claims

1. An automatic equilibrium moisture coal sample preparation device, comprising a thermostatic box, a partition plate, a sample stage, a weighing bearing, an electronic balance, an evaporation tank, and a control circuit board; an upper portion of the thermostatic box defines an equilibrium moisture chamber via the partition plate, the evaporation tank and the sample stage are disposed within the equilibrium moisture chamber, and the electronic balance is disposed below the partition plate; a hole is provided in the center of the partition plate, a part of the measurement bearing passes through the hole, a top of the measurement bearing is connected to the sample stage, and a bottom of the measurement bearing is connected to the electronic balance; The constant temperature box and the electronic balance are electrically connected to the control circuit board, respectively, and the control circuit board sets the temperature and collects data, and calculates and presents the equilibrium moisture result based on the collected data.

2. 2. The apparatus for automatically preparing an equilibrium moisture coal sample as claimed in claim 1, further comprising a water level alarm sensor, said water level alarm sensor being submerged and disposed within said evaporation tank and connected to said control circuit board.

3. 2. The apparatus for automatically preparing an equilibrium moisture coal sample according to claim 1, wherein the sample stage is provided with a sample tray, the size of the sample stage is larger than that of the sample tray, and a baffle plate is provided at an edge of the sample stage.

4. 2. The apparatus for automatically preparing an equilibrium moisture coal sample according to claim 1, wherein the equilibrium moisture chamber is provided with a hatch door, the hatch door is provided with a transparent observation window, and the water level in the evaporation tank can be observed through the transparent observation window.

5. 5. The apparatus for automatically preparing an equilibrium moisture coal sample as claimed in claim 4, wherein the hatch door is provided with a handle, which is locked up to a housing connection port of the thermostatic box when closed, and a sealing strip is further attached to an inner outer edge of the hatch door.

6. 2. The apparatus for automatically preparing an equilibrium moisture coal sample according to claim 1, wherein the top of the weighing bearing is fixedly connected to the sample stage, and the bottom of the weighing bearing is placed on the electronic balance via a counterweight base and contact-connected to the electronic balance.

7. The apparatus for automatically preparing an equilibrium moisture coal sample according to claim 1, further comprising: a high-temperature resistant silica gel disk that is sealed and connected to the hole of the partition plate; a segment with a reduced diameter is provided at the portion of the metering bearing that passes through the hole of the partition plate; and a through hole with a hole diameter smaller than the diameter of the segment is provided at the center of the high-temperature resistant silica gel disk; and when installed, the high-temperature resistant silica gel disk is nested in the segment of the metering bearing.

8. 2. The apparatus for automatically preparing an equilibrium moisture coal sample according to claim 1, wherein the evaporation tank is made of a transparent material, has an open top, is provided in a plurality of tanks, and is uniformly arranged at various positions within the equilibrium moisture chamber.

9. further comprising a control button, an indicator light, a display and / or a printing device connected to the control circuit board; The control buttons include a weighing tray button, a sample preparation start button, and a preliminary weighing button; The indicator lamps include a preparation indicator lamp, a preparation completion indicator lamp, and a water level abnormality indicator lamp; The display shows the initial sample mass, the previously measured mass, the currently measured mass, and the mass change rate, 2. The apparatus for automatically preparing an equilibrium moisture coal sample as claimed in claim 1, wherein the printing device is used to realize note printing of the weighing data.

10. A method for the automated preparation of equilibrium moisture coal samples, said method being carried out using an automated preparation device according to any one of claims 1 to 9, said method comprising the steps of: Starting the automatic preparation device, setting the equilibrium temperature of the thermostatic box, and adding a certain amount of potassium sulfate supersaturated solution into the evaporation tank until the automatic preparation device becomes stable; Before placing the coal sample, weigh the current mass m of the sample stage; preparing a coal sample with a particle size of 0.18 mm to 0.25 mm, weighing a coal sample of 35 g or more after air drying, placing the coal sample on a sample stage, uniformly adding an appropriate amount of distilled water, and collecting mass data of an electronic balance at a time interval preset by a control circuit board; and a rate of mass change of the coal sample calculated by the control circuit board reaching a preset condition, indicating completion of preparation of the equilibrium moisture coal sample.

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