Magnetic suspension balance and control method thereof

Abstract

The present invention relates to the technical field of magnetic suspension measurement, and specifically provides a magnetic suspension balance and a control method thereof, aimed at solving the problems of existing magnetic suspension balances in which the assembly structure of the coil and the stator permanent magnet is complex, disassembly and assembly are difficult, and due to the large space occupied, the diameter of the reaction chamber of the magnetic suspension balance is large, resulting in a decrease in the high-pressure resistance rating. The magnetic suspension balance of the present invention comprises a sample chamber and a magnetic suspension weighing module, wherein the magnetic suspension weighing module comprises an analytical balance, a first magnetic force device, a second magnetic force device, and a weighing component, the first magnetic force device is connected to the analytical balance, the second magnetic force device is connected to the weighing component, and the weighing component is connected to a sample; and a stabilization module, wherein the stabilization module comprises a third magnetic force device disposed outside the sample chamber and a fourth magnetic force device disposed inside the sample chamber, and the fourth magnetic force device is connected to the second magnetic force device and is capable of, under the magnetic force of the third magnetic force device, driving the second magnetic force device to eliminate displacement, cease rotation, and maintain stability.

Description

Magnetic levitation balance and its control method

[0001] This patent application claims priority to Chinese patent application CN202411856917.1, filed on December 17, 2024, entitled “Magnetic Levitation Balance and Control Method Thereof”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of magnetic levitation measurement technology, specifically providing a magnetic levitation balance and its control method. Background Technology

[0003] Magnetic levitation balances, as precision weighing instruments, are frequently used to measure minute weight changes in test samples, such as in gas adsorption experiments. A magnetic levitation balance consists of an electromagnet and a permanent magnet. When the electromagnet is energized, the magnetic force attracts the permanent magnet upwards. The permanent magnet then drives other parts of the weighing system upwards, suspending them in a levitated state. Because there is only a very small frictional force between the permanent magnet and the gas in the horizontal direction, the balance tends to rotate easily and for extended periods without stopping. This phenomenon causes fluctuations in the magnetic levitation balance readings, reducing its accuracy and stability.

[0004] To address the aforementioned issues, Chinese patent CN115540980A proposes a magnetic levitation balance and its mass measurement method based on a three-actuator structure. This method involves placing a stator permanent magnet and three rotationally symmetrically distributed coils above a mover permanent magnet, along with a displacement sensor to provide feedback on the position and attitude of the permanent magnet. When the stator permanent magnet and coils are energized, the resulting magnetic force stabilizes the permanent magnet, allowing it to levitate stably. The mass of the sample is obtained by measuring the current in the three coils, and the measurement error caused by the permanent magnet's spin or wobbling is avoided by adjusting the magnitude of the current in the three coils. However, the magnetic levitation balance described in the patent is a non-enclosed balance, requiring a larger internal space to accommodate the complex structure assembled from the coils and stator permanent magnet. In contrast, enclosed magnetic levitation balances have a smaller internal space, making it impossible to accommodate the complex coil and stator permanent magnet structures mentioned in the patent, either vertically or horizontally. Furthermore, the larger space required results in a larger reaction chamber diameter, reducing the high-pressure resistance and affecting measurements under high-temperature and high-pressure environments. Therefore, although the aforementioned patent documents improved the structure of non-closed balances, they are not of much reference value for the design of closed balances.

[0005] In view of this, there is a need in the field for a new magnetic levitation balance to solve the existing problems. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problems that the existing magnetic levitation balance has a complex assembly structure for coils and stator permanent magnets, is difficult to assemble and disassemble, and occupies a large space, resulting in a large reaction chamber diameter and a reduced high voltage resistance level.

[0007] In a first aspect, the present invention provides a magnetic levitation balance, comprising: a main body module having a sample chamber formed therein; a magnetic levitation weighing module, the magnetic levitation weighing module including an analytical balance and a first magnetic device disposed outside the sample chamber, and a second magnetic device and a weighing component disposed inside the sample chamber, the first magnetic device being connected to the analytical balance, the second magnetic device being connected to the weighing component, the weighing component being used to hold a sample, the first magnetic device being able to magnetically attract the second magnetic device, the weighing component, and the sample and weigh them through the analytical balance; and a stabilization module, the stabilization module including a third magnetic device disposed outside the sample chamber and a fourth magnetic device disposed inside the sample chamber, the fourth magnetic device being connected to the second magnetic device and being able to drive the second magnetic device and the weighing component to move under the magnetic force of the third magnetic device so that they are centered and do not rotate.

[0008] In the specific embodiment of the above-mentioned magnetic levitation balance, the first magnetic device is an electromagnet, the second magnetic device is a permanent magnet, the first magnetic device is disposed above the second magnetic device, and / or, the third magnetic device is an electromagnet, the fourth magnetic device is a permanent magnet, the third magnetic device is disposed to the side of the fourth magnetic device, and the first magnetic device, the third magnetic device and the analytical balance are all communicatively connected to the controller of the magnetic levitation balance.

[0009] In the specific implementation of the above-mentioned magnetic levitation balance, the number of the third magnetic device is one, or the number of the third magnetic device is an odd number more than one and is centrally symmetrically distributed about the fourth magnetic device, or the number of the third magnetic device is an even number and is symmetrically distributed about the fourth magnetic device.

[0010] In the specific embodiment of the above-mentioned magnetic levitation balance, the weighing component includes a first connecting rod and a second connecting rod. The two ends of the first connecting rod are respectively connected to the second magnetic device and the first end of the second connecting rod. The second end of the second connecting rod is provided with a first lifting block. The fourth magnetic device is installed on the second connecting rod. The weighing component also includes a coupling frame, a first support frame, a first crucible, and a third connecting rod. The first crucible is used to hold the sample. The coupling frame is placed on the first support frame and connected to the first crucible through the third connecting rod. The main module is provided with a protective frame. The first support frame is installed on the protective frame. The first lifting block can move a certain distance in the coupling frame under the drive of the second magnetic device and then abut against the coupling frame, driving the coupling frame and the first crucible to move to a suspended state detached from the first support frame.

[0011] In the specific embodiment of the above-mentioned magnetic levitation balance, the weighing component further includes a second support frame and a settling plate / second crucible. The second support frame is installed on the protective frame, and a second lifting block is fixedly installed on the third connecting rod. The settling plate / second crucible is placed on the second support frame and slidably sleeved on the third connecting rod. The settling plate / second crucible is located above the second lifting block. The second lifting block can be suspended and moved a distance under the drive of the coupling frame and then abut against the settling plate / second crucible, and drive the settling plate / second crucible to move to a suspended state detached from the second support frame.

[0012] In the specific embodiment of the above-mentioned magnetic levitation balance, the magnetic force of the first magnetic device on the second magnetic device also includes a repulsive force. The first lifting block can also move downward under the drive of the second magnetic device, driving the coupling frame, the first crucible, the second lifting block and the settling plate / second crucible to descend, and finally causing the settling plate / second crucible to land on the second support frame, and causing the coupling frame to land on the first support frame.

[0013] In the specific embodiment of the above-mentioned magnetic levitation balance, the magnetic levitation weighing module further includes a position sensor disposed outside the sample chamber and a position sensor disposed inside the sample chamber. The position sensor is mounted on the second connecting rod, and the position sensor is disposed to the side of the position sensor. The position sensor can obtain the position information of the second magnetic device, the fourth magnetic device, the weighing component, and the sample through the position sensor. The position sensor is communicatively connected to the controller of the magnetic levitation balance.

[0014] In the specific embodiment of the above-mentioned magnetic levitation balance, the main module includes a first pressure-resistant shell and a second pressure-resistant shell. The second pressure-resistant shell is detachably installed below the first pressure-resistant shell. The magnetic levitation balance also includes a temperature control module. The temperature control module includes a constant temperature jacket sleeved on the outside of the first pressure-resistant shell and a high temperature jacket or electric heating jacket sleeved on the outside of the second pressure-resistant shell. The third magnetic device and / or the position sensor are installed on the constant temperature jacket.

[0015] In the specific embodiment of the above-mentioned magnetic levitation balance, the first pressure-resistant shell is provided with an air inlet, the second pressure-resistant shell is provided with an air outlet, the first pressure-resistant shell and the second pressure-resistant shell are respectively provided with a first flange and a second flange, the first flange and the second flange are respectively provided with a first mounting hole and a second mounting hole, the first pressure-resistant shell is detachably installed with the second pressure-resistant shell through the first mounting hole and the second mounting hole; and / or, the first pressure-resistant shell and the second pressure-resistant shell are made of high-pressure resistant materials, and the first pressure-resistant shell is made of non-magnetic or weakly magnetic materials.

[0016] In the specific embodiment of the above-mentioned magnetic levitation balance, the end of the first connecting rod is provided with a thread / threaded hole, and the end of the corresponding second connecting rod is provided with a threaded hole / thread. The first connecting rod and the second connecting rod are detachably connected through the thread / threaded hole; and / or, the first lifting block and / or the second lifting block are conical; and / or, the upper surface and the lower surface of the coupling frame are annular, and the upper surface and the lower surface are connected and fixed by a support rod; and / or, the positions of the first support frame and the second support frame on the protective frame are adjustable.

[0017] This invention also provides a control method for a magnetically levitated balance, comprising the magnetically levitated balance described in any one of the above technical solutions, the control method comprising: controlling the first magnetic device to adjust to the ZP position for zeroing; controlling the first magnetic device to adjust to the MP1 position and controlling the analytical balance to acquire the weight M of the first crucible. c1 The first magnetic device is adjusted to the MP2 setting, and the analytical balance is controlled to obtain the weight M of the second crucible. c2 The first magnetic device is adjusted to the MP1 setting, and the analytical balance is controlled to obtain the weight M of the sample in the first crucible. s1 The first magnetic device is adjusted to the MP2 setting, and the analytical balance is controlled to obtain the weight M of the sample in the second crucible. s2 .

[0018] In a specific embodiment of the control method for the magnetic levitation balance described above, the step "controlling the first magnetic device to adjust to the ZP position for zeroing" further includes: controlling the first magnetic device to be energized and generating a first magnetic force, causing the first lifting block to move to a suspended state within the coupling frame under the drive of the second magnetic device, reading the reading of the analytical balance, and controlling the magnetic levitation balance to zero.

[0019] In the specific implementation of the control method for the magnetic levitation balance described above, the step "controlling the first magnetic device to adjust to the MP1 position and controlling the analytical balance to obtain the weight M of the first crucible" is... c1 "Further includes: controlling the first magnetic device to be energized and generating a second magnetic force; the first lifting block, driven by the second magnetic device, moves a certain distance within the coupling frame and then abuts against the coupling frame, causing the coupling frame and the first crucible to move to a suspended state; subsequently, controlling the analytical balance to read the value and obtaining the weight M of the first crucible." c1 .

[0020] In the specific implementation of the control method for the magnetic levitation balance described above, the step "controlling the first magnetic device to adjust to the MP2 position and controlling the analytical balance to obtain the weight M of the second crucible" is as follows: c2 "Further includes: controlling the first magnetic device to be energized and generating a third magnetic force; the first lifting block, driven by the second magnetic device, moves a certain distance within the coupling frame and then abuts against the coupling frame, driving the coupling frame, the first crucible, and the second crucible to move into a suspended state; subsequently, controlling the analytical balance to read the value and obtaining the total weight M of the first crucible and the second crucible." c Based on formula M c2 =M c -M c1 Obtain the weight M of the second crucible c2 .

[0021] In the specific implementation of the control method for the magnetic levitation balance described above, the step "controlling the first magnetic device to adjust to the MP1 position and controlling the analytical balance to obtain the weight M of the sample in the first crucible" s1 "Further includes: controlling the first magnetic device to be energized and generating a fourth magnetic force; the first lifting block, driven by the second magnetic device, moves a certain distance within the coupling frame and then abuts against the coupling frame, moving the coupling frame, the first crucible, and the sample inside the first crucible to a suspended state; subsequently, controlling the analytical balance to read the value and obtaining the total weight M of the first crucible and the sample inside the first crucible." c3 Based on formula M s1 =M c3-M c1 Obtain the sample weight M in the first crucible s1 .

[0022] In the specific implementation of the control method for the magnetic levitation balance described above, the step "controlling the first magnetic device to adjust to the MP2 position and controlling the analytical balance to obtain the weight M of the sample in the second crucible" s2 "Further includes: controlling the first magnetic device to be energized and generating a fifth magnetic force; the first lifting block, driven by the second magnetic device, moves a certain distance within the coupling frame and then abuts against the coupling frame, thereby moving the coupling frame, the first crucible, the sample in the first crucible, the second crucible, and the sample in the second crucible to a suspended state; subsequently, controlling the analytical balance to read and obtaining the total weight M of the first crucible, the sample in the first crucible, the second crucible, and the sample in the second crucible." c5 Based on formula M s2 =M c5 -M c3 -M c2 Obtain the sample weight M in the second crucible. s2 .

[0023] In a specific embodiment of the control method for the magnetic levitation balance described above, the magnetic levitation weighing module further includes a position sensor disposed outside the sample chamber and a position sensor disposed inside the sample chamber. The position sensor is mounted on the second connecting rod, and the position sensor is disposed to the side of the position sensor. The position sensor can acquire position information of the second magnetic device, the fourth magnetic device, the weighing component, and the sample through the position sensor. The position sensor is communicatively connected to the controller of the magnetic levitation balance. The control method further includes: controlling the position sensor to acquire the position information of the weighing component and / or the sample; comparing the position information of the weighing component and / or the sample with the magnitude of preset position information; controlling the first magnetic device to adjust the magnitude of the generated magnetic force based on the comparison result; if the position information of the weighing component and / or the sample is greater than the preset position information, then controlling the magnetic force generated by the first magnetic device to decrease; if the position information of the weighing component and / or the sample is less than the preset position information, then controlling the magnetic force generated by the first magnetic device to increase; if the position information of the weighing component and / or the sample is equal to the preset position information, then controlling the magnetic force generated by the first magnetic device to remain unchanged.

[0024] In a specific embodiment of the control method for the magnetic levitation balance described above, the number of the third magnetic devices is odd and they are centrally symmetrically distributed about the fourth magnetic device, or the number of the third magnetic devices is even and they are symmetrically distributed about the fourth magnetic device. The control method further includes: acquiring the induced electromotive force of the third magnetic device; and controlling the direction and / or magnitude of the magnetic force generated by the third magnetic device based on the induced electromotive force of the third magnetic device.

[0025] In the specific implementation of the control method for the magnetic levitation balance described above, after the step "controlling the magnitude of the magnetic force generated by the third magnetic device based on the induced electromotive force of the third magnetic device", it further includes: controlling the magnitude of the magnetic force generated by the third magnetic device to be equal.

[0026] In the specific implementation of the control method for the magnetic levitation balance described above, after the step "controlling the first magnetic device to adjust the magnitude of the generated magnetic force based on the comparison result", the method further includes: obtaining the number of times the first magnetic device adjusts the magnitude of the generated magnetic force; comparing the number of times the first magnetic device adjusts the magnitude of the generated magnetic force with a preset number; if the number of times the first magnetic device adjusts the magnitude of the generated magnetic force is greater than or equal to the preset number, then controlling the magnetic force generated by the first magnetic device to slowly decrease and eventually stop generating magnetic force.

[0027] The technical effect of this invention is as follows: During the operation of the magnetic levitation balance of this invention, when the second magnetic device, the fourth magnetic device, the weighing component inside the sample chamber, and the sample spin or shift, the magnetic force of the third magnetic device on the fourth magnetic device is adjusted by adjusting the magnitude / direction of the magnetic force generated by the third magnetic device. Since the fourth magnetic device is directly or indirectly connected to the second magnetic device, the weighing component, and the sample, the fourth magnetic device can drive the second magnetic device, the weighing component, and the sample to move / stop moving and rotate / stop rotating. Thus, the magnetic levitation balance of this invention can adjust the attitude of the second magnetic device, the fourth magnetic device, the weighing component, and the sample inside the sample chamber, avoiding their spin and shift from affecting the accuracy of the magnetic levitation balance reading. Because the stabilization module of the magnetic levitation balance is set on the outside and inside of the sample chamber respectively in this invention, the complexity of the assembly structure inside the sample chamber is reduced, thereby reducing the space occupied inside the sample chamber. This solves the problems of the complex assembly structure of the coil and stator permanent magnet of the existing magnetic levitation balance, the difficulty of disassembly and assembly, and the large space occupied, which leads to a large reaction chamber diameter and a decrease in the high voltage resistance level. Attached Figure Description

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0029] Figure 1 is a schematic diagram of the overall structure of the magnetic levitation balance of the present invention;

[0030] Figure 2 is a schematic diagram of the OFF position of the magnetic levitation balance of the present invention;

[0031] Figure 3 is a schematic diagram of the ZP position of the magnetic levitation balance of the present invention;

[0032] Figure 4 is a schematic diagram of the MP1 position of the magnetic levitation balance of the present invention;

[0033] Figure 5 is a schematic diagram of the MP2 position of the magnetic levitation balance of the present invention;

[0034] Figure 6 is a main flowchart of Embodiment 2 of the present invention;

[0035] Figure 7 is a flowchart of step S1 in Embodiment 2 of the present invention;

[0036] Figure 8 is a flowchart of step S2 in Embodiment 2 of the present invention;

[0037] Figure 9 is a flowchart of step S3 in Embodiment 2 of the present invention;

[0038] Figure 10 is a flowchart of step S4 in Embodiment 2 of the present invention;

[0039] Figure 11 is a flowchart of step S5 in Embodiment 2 of the present invention;

[0040] Figure 12 is a main flowchart of Embodiment 3 of the present invention;

[0041] Figure 13 is a flowchart of steps SD, SE, and SF in Embodiment 3 of the present invention;

[0042] Figure 14 is a flowchart of Embodiment 4 of the present invention.

[0043] List of reference numerals in the attached diagram:

[0044] 1-Magnetic levitation balance; 111-First pressure-resistant shell; 1111-Air inlet; 1112-First flange; 112-Second pressure-resistant shell; 1121-Air outlet; 1122-Second flange; 113-Sample chamber; 114-Protective frame; 121-Thermostatic jacket; 122-High-temperature jacket / electric heating jacket; 131-Analytical balance; 132-First magnetic device; 133-Second magnetic device; 134-Weighing component; 1341 1342-First connecting rod; 1342-Second connecting rod; 13421-First lifting block; 1343-Coupling frame; 1344-First support frame; 1345-First crucible; 1346-Third connecting rod; 1347-Second support frame; 13471-Second lifting block; 1348-Sinking plate / Second crucible; 135-Position sensor; 136-Position sensor; 141-Third magnetic device; 142-Fourth magnetic device. Detailed Implementation

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0046] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Example 1

[0049] As shown in Figures 1-5, to address the problems of complex assembly and disassembly difficulties of the coil and stator permanent magnet in existing magnetic levitation balances 1, and the large reaction chamber diameter and reduced high-voltage withstand capability due to their large space occupation, the magnetic levitation balance 1 of this invention includes:

[0050] The main module includes a first pressure-resistant shell 111 and a second pressure-resistant shell 112. The first pressure-resistant shell 111 is detachably mounted on top of the second pressure-resistant shell 112. Both the first and second pressure-resistant shells are made of high-pressure resistant materials. The first pressure-resistant shell 111 is made of non-magnetic or weakly magnetic material. A sample chamber 113 is formed inside both the first and second pressure-resistant shells 111 and 112. An air inlet 1111 is provided on the first pressure-resistant shell 111, and an air outlet 1121 is provided on the second pressure-resistant shell 112. A first flange 1112 and a second flange 1122 are respectively provided on the first and second flanges 1112 and 1122, respectively, with a first mounting hole and a second mounting hole (not shown in the figure). The first pressure-resistant shell 111 is detachably mounted to the second pressure-resistant shell 112 through the first and second mounting holes. A protective frame 114 is also provided inside the first pressure-resistant shell 111.

[0051] The temperature control module includes a constant temperature jacket 121 sleeved on the outside of the first pressure-resistant shell 111 and a high-temperature heating jacket or electric heating jacket 122 sleeved on the outside of the second pressure-resistant shell 112.

[0052] The magnetic levitation weighing module includes an analytical balance 131 and a first magnetic device 132 disposed outside the sample chamber 113, and a second magnetic device 133 and a weighing component 134 disposed inside the sample chamber 113. The first magnetic device 132 is connected to the analytical balance 131 and is an electromagnet, positioned above the second magnetic device 133. The second magnetic device 133 is a permanent magnet and is connected to the weighing component 134. The weighing component 134, from top to bottom, includes a first connecting rod 1341, a second connecting rod 1342, a first lifting block 13421, a coupling frame 1343, a first support frame 1344, a third connecting rod 1346, a settling plate / second crucible 1348, a second support frame 1347, a second lifting block 13471, and a first crucible 1345. The first end of the first connecting rod 1341 is connected to the second magnetic device 133, and the second end is provided with a thread / threaded hole. The first end of the second connecting rod 1342 is provided with a threaded hole / thread. The first connecting rod 1341 and the second connecting rod 1342 are detachably connected through the thread / threaded hole. The first lifting block 13421 is disposed on the second end of the second connecting rod 1342 and is located inside the coupling frame 1343. The first lifting block 13421 is conical. The coupling frame 1343 is placed on the first support frame 1344 and is connected to the first crucible 1345 through the third connecting rod 1346. The upper and lower surfaces of the coupling frame 1343 are annular, and the upper and lower surfaces are connected and fixed by a support rod. The first support frame 1344 is installed on the protective frame 114, and the position of the first support frame 1344 on the protective frame 114 is adjustable. The settling plate / second crucible 1348 is placed on the second support frame 1347, and a through hole is provided in the middle area of ​​the settling plate / second crucible 1348 to allow it to slide onto the third connecting rod 1346. The second support frame 1347 is mounted on the protective frame 114, and the position of the second support frame 1347 on the protective frame 114 is adjustable. The second lifting block 13471 is fixedly mounted on the third connecting rod 1346 and located below the settling plate / second crucible 1348. The second lifting block 13471 is conical in shape. The magnetic levitation weighing module also includes a position sensor 135 disposed outside the sample chamber 113 and a position sensor 136 disposed inside the sample chamber 113. The position sensor 136 is mounted on the second connecting rod 1342, and the position sensor 135 is disposed to the side of the position sensor 136 and mounted on the constant temperature jacket 121.

[0053] The stabilization module includes a third magnetic device 141 located outside the sample chamber 113 and a fourth magnetic device 141 located inside the sample chamber 113. The fourth magnetic device 141 is mounted on the second connecting rod 1342. Four third magnetic devices 141 are provided and distributed on the constant temperature jacket 121 on the side of the fourth magnetic device 141. The third magnetic device 141 is an electromagnet and the fourth magnetic device 141 is a permanent magnet.

[0054] The first magnetic device 132, the third magnetic device 141, the analytical balance 131, and the position sensor 135 are all communicatively connected to the controller of the magnetic levitation balance 1. The first crucible 1345 and the second crucible are used to hold the samples.

[0055] In the above-described embodiment, taking the second crucible 1348 placed on the second support frame 1347 as an example, during the use of the magnetic levitation balance 1 of the present invention, the first pressure-resistant shell 111 and the second pressure-resistant shell 112 are opened, and the sample to be tested is placed in the first crucible 1345 and the second crucible 1348. The first pressure-resistant shell 111 and the second pressure-resistant shell 112 are installed and fixed by fasteners through the first mounting holes and the second mounting holes on the first flange 1112 and the second flange 1122, and then weighing begins. The controller controls the first magnetic device 132 to generate magnetic force (attraction force) by energizing it. Since the first pressure-resistant shell 111 is a non-magnetic or weakly magnetic material, the magnetic force generated by the first magnetic device 132 can pass through the first pressure-resistant shell 111 and act on the second magnetic device 133 in the sample chamber 113. The second magnetic device 133 moves upward under the action of the magnetic force and drives the position sensor 136 and the first lifting block 13421 to move upward through the first connecting rod 1341 and the second connecting rod 1342. After the first lifting block 13421 moves upward and suspended within the coupling frame 1343 for a certain distance, it abuts against the top surface of the coupling frame 1343. This then drives the coupling frame 1343, along with the first crucible 1345 connected to it via the third connecting rod 1346 (including the second lifting block 13471 mounted on the third connecting rod 1346) and the sample within the first crucible 1345, to move upward. The position sensor 135 and position sensor 136 can detect the second magnetic device 133, the fourth magnetic device 141, the weighing component 134, and the sample. The position information is obtained, and it can be determined whether the coupling frame 1343 has moved to a suspended state detached from the first support frame 1344. When the coupling frame 1343 moves to a suspended state detached from the first support frame 1344, since there is a certain distance between the second lifting block 13471 and the second crucible 1348, the second lifting block 13471 does not contact the second crucible 1348 at this time. After determining that the sample is stable based on the above position information, the weight of the sample in the first crucible 1345 can be obtained by analyzing the reading of the balance 131. After the reading is completed, the controller controls the first magnetic device 132 to increase the magnetic force. Under the magnetic force of the first magnetic device 132, the second magnetic device 133 drives the coupling frame 1343, which is indirectly connected to it, to continue to move upward. Then, the coupling frame 1343 drives the third connecting rod 1346, the second lifting block 13471 on the third connecting rod 1346, the first crucible 1345, and the sample in the first crucible 1345 to move upward. After moving a certain distance, the second lifting block 13471 abuts against the second crucible 1348 and drives the second crucible 1348 to move to a suspended state detached from the second support frame 1347 (the relevant position information is also obtained through the position sensor 135 and the position sensor 136). After the sample stabilizes, the weight of the sample in the second crucible 1348 can be obtained by reading the balance 131.

[0056] The magnetic force of the first magnetic device 132 on the second magnetic device 133 also includes a repulsive force. The first lifting block 13421 can also move downward under the drive of the second magnetic device 133, causing the coupling frame 1343, the first crucible 1345, the second lifting block 13471 and the settling plate / second crucible 1348 to fall down, and finally causing the settling plate / second crucible 1348 to fall onto the second support frame 1347, and causing the coupling frame 1343 to fall onto the first support frame 1344.

[0057] During the aforementioned sample weight measurement process, especially when reading the analytical balance 131, the second magnetic device 133, the fourth magnetic device 141, the weighing component 134 inside the sample chamber 113, and the sample experience only minimal frictional force with the gas in the horizontal direction. Therefore, these components are prone to spinning or shifting, and the balance cannot be stopped for extended periods, leading to fluctuations in the analytical balance 131 reading and reduced accuracy. To address this, a stabilization module is also included in this embodiment. Because four symmetrically distributed third magnetic devices 141 (electromagnets) are set on the constant temperature jacket 121 outside the first pressure-resistant shell 111, when the fourth magnetic device 141 spins, the change in its magnetic field will cause an induced electromotive force to be generated in the four third magnetic devices 141. This induced electromotive force is measured in real time by the controller through the third magnetic device 141, and the voltage applied to both ends of each third magnetic device 141 is adjusted in real time according to the magnitude and trend of the induced electromotive force, thereby changing the magnitude of the force (including attractive or repulsive force) applied by the third magnetic device 141 to the fourth magnetic device 141, so that the fourth magnetic device 141 stops rotating, that is, the permanent magnet rod and the weighing system both stop rotating and are stably suspended. When the fourth magnetic device 141 deviates, the attraction force generated by the four third magnetic devices 141 on the fourth magnetic device 141 is uneven, which will cause the force on the fourth magnetic device 141 to be unbalanced. At this time, the controller controls the voltage applied to the two ends of the four third magnetic devices 141 to be equal, and the fourth magnetic device 141 will be affected by the magnetic force and automatically return to the center position.

[0058] The advantages of the above-described embodiment are as follows: by adjusting the magnitude / direction of the magnetic force generated by the third magnetic device 141, the magnetic force of the third magnetic device 141 on the fourth magnetic device 141 can be adjusted. Since the fourth magnetic device 141 is directly or indirectly connected to the second magnetic device 133, the weighing component 134, and the sample, the fourth magnetic device 141 can drive the second magnetic device 133, the weighing component 134, and the sample to move / stop moving and rotate / stop rotating. Thus, the magnetic levitation balance 1 of the present invention can realize the adjustment of the attitude of the second magnetic device 133, the fourth magnetic device 141, the weighing component 134, and the sample in the sample chamber 113, avoiding their spin and offset from affecting the reading accuracy of the magnetic levitation balance 1. Furthermore, since the stabilization module of the magnetic levitation balance 1 is set outside and inside the sample chamber 113 respectively in this invention, the complexity of the assembly structure inside the sample chamber 113 is reduced, thereby reducing the space occupied inside the sample chamber 113. This solves the problems of the complex assembly structure of the coil and stator permanent magnet of the existing magnetic levitation balance 1, the difficulty of disassembly and assembly, and the large space occupied, which leads to a large reaction chamber diameter and a decrease in the high voltage resistance level.

[0059] Furthermore, since the magnetic levitation balance 1 is frequently used to measure minute weight changes in test samples, such as in gas / liquid adsorption experiments, this embodiment also provides an air inlet 1111 and an air outlet 1121 (or liquid inlet and liquid outlet) on the first pressure-resistant shell 111 and the second pressure-resistant shell 112, respectively. Simultaneously, by providing a constant-temperature jacket 121 on the outside of the first pressure-resistant shell 111 and a high-temperature heating jacket or electric heating jacket 122 on the outside of the second pressure-resistant shell 112, the magnetic levitation balance 1 of this invention can select a suitable heating device according to the temperature requirements of the experiment. For example, a high-temperature jacket is used when the temperature is -40 to +150°C, and the circulating liquid flowing through the high-temperature jacket can maintain the sample area inside the second pressure-resistant shell 112 at the target temperature. When the required temperature is >150°C, an electric heating jacket is selected. The first pressure-resistant shell 111 is covered by a constant temperature jacket 121, through which the liquid flowing inside is kept at a constant temperature of 80°C. Its function is to ensure that the parts inside the first pressure-resistant shell 111 are kept within a constant temperature range that allows them to work normally, regardless of whether the second pressure-resistant shell 112 and the sample are in a low-temperature or high-temperature state.

[0060] Furthermore, in this embodiment, the first magnetic device 132 and the third magnetic device 141 (both electromagnets) are located outside the sample chamber 113. Besides simplifying the internal structure of the sample chamber 113 and reducing space occupation, as mentioned above, since the circuitry is located outside the sample chamber 113 and does not come into contact with the atmosphere inside, the magnetic levitation balance 1 of this invention can also be applied to experiments involving flammable and explosive gases and high-temperature, high-pressure environments. Of course, those skilled in the art can adjust the types of the first magnetic device 132, the second magnetic device 133, the third magnetic device 141, and the fourth magnetic device 141 according to actual needs. For example, the second magnetic device 133 and / or the fourth magnetic device 141 can be configured as electromagnetic devices; these changes are all within the scope of protection of this invention.

[0061] Furthermore, regarding the connection method between the first connecting rod 1341 and the second connecting rod 1342 mentioned above, those skilled in the art can also set it to other common connection methods, such as snap-fit ​​or sleeve connection. The aforementioned threaded connection method is not a limitation on the connection method between the first connecting rod 1341 and the second connecting rod 1342. Similarly, regarding the shape of the coupling frame 1343, the first lifting block 13421, and the second lifting block 13471, those skilled in the art can also make conventional adjustments according to actual needs, as long as they can achieve the same function. These changes do not exceed the technical principles of the present invention and are therefore all included within the protection scope of the present invention. In addition, this embodiment also mentions that the positions of the first support frame 1344 and the second support frame 1347 mounted on the protective frame 114 are adjustable, so that the magnetic levitation balance 1 of the present invention can adjust the positions of the first support frame 1344 and the second support frame 1347 accordingly according to the test sample.

[0062] Regarding the number of the third magnetic device 141, those skilled in the art will understand that although it was mentioned above that four third magnetic devices 141 are provided, this is not the only implementation. Those skilled in the art can also set the number of third magnetic devices 141 to any other even number, as long as they are symmetrically distributed on the side of the fourth magnetic device 141. Alternatively, those skilled in the art can also set the number of third magnetic devices 141 to an odd number, more than one, and centrally symmetrically distributed on the side of the fourth magnetic device 141. The technical principles of these implementations are consistent with the technical principles of the four third magnetic devices 141 mentioned above, and will not be repeated here. It is also worth mentioning that those skilled in the art can set the number of third magnetic devices 141 to one. In this way, during the adjustment of the spin and deflection of the fourth magnetic device 141, the third magnetic device 141 can be energized first to generate a magnetic field around it. Assuming that the N pole of the third magnetic device 141 is facing the fourth magnetic device 141 at this time, due to the repulsion of like poles and the attraction of unlike poles of magnets, the N pole of the fourth magnetic device 141 is repelled away from the third magnetic device 141 due to the repulsive force, while the S pole of the fourth magnetic device 141 is attracted to the third magnetic device 141 and eventually faces the third magnetic device 141, thereby controlling the fourth magnetic device 141 to stop rotating. However, at this time, the fourth magnetic device 141 is deflected due to the attraction of the third magnetic device 141. Therefore, after the fourth magnetic device 141 stops rotating, the magnitude and direction of the magnetic force of the third magnetic device 141 can be adjusted so that the fourth magnetic device 141 is moved away from the third magnetic device 141 and eventually positioned vertically at the center of the sample chamber 113.

[0063] The foregoing embodiments described the scheme for measuring the weight of two samples using the magnetic levitation balance 1 of the present invention. It is worth mentioning that the magnetic levitation balance 1 of the present invention can also be applied to gas / liquid / supercritical fluid adsorption experiments and can measure fluid density. Specifically, in one possible embodiment, the magnetic levitation balance 1 of the present invention can replace the second crucible 1348 with a sedimentation plate. The process of measuring the weight of the sedimentation plate is consistent with the aforementioned process of measuring the weight of the second crucible 1348, and will not be repeated here. After the adsorption experiment is completed, the weight M of the sedimentation plate is measured by the analytical balance 131. Adding this to the previously measured sedimentation plate volumes Vsinker and Msinker, the density ρ of the gas, liquid, or supercritical fluid in the sample chamber 113 can be calculated using the formula ρ = (Msinker - M) / Vsinker.

[0064] Example 2

[0065] The present invention also provides a control method for a magnetically levitated balance 1, wherein the magnetically levitated balance 1 is the magnetically levitated balance 1 in the aforementioned embodiment 1, as shown in Figures 1-11. The control method includes:

[0066] S1. Control the first magnetic device 132 to adjust to the ZP position for zeroing;

[0067] S2. Control the first magnetic device 132 to adjust to the MP1 position and control the analytical balance 131 to obtain the weight M of the first crucible 1345. c1 ;

[0068] S3. Control the first magnetic device 132 to adjust to the MP2 position and control the analytical balance 131 to obtain the weight M of the second crucible 1348. c2 ;

[0069] S4. Control the first magnetic device 132 to adjust to the MP1 position and control the analytical balance 131 to obtain the weight M of the sample in the first crucible 1345. s1 ;

[0070] S5. Control the first magnetic device 132 to adjust to the MP2 position and control the analytical balance 131 to obtain the weight M of the sample in the second crucible 1348. s2 .

[0071] Of the above steps, step S1 further includes:

[0072] S11. Control the first magnetic device 132 to be energized and generate the first magnetic force, so that the first lifting block 13421 moves to a suspended state in the coupling frame 1343 under the drive of the second magnetic device 133, read the reading of the analytical balance 131, and control the magnetic levitation balance 1 to be zeroed.

[0073] Step S2 further includes:

[0074] S21. The first magnetic device 132 is energized to generate a second magnetic force. Driven by the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343, causing the coupling frame 1343 and the first crucible 1345 to move to a suspended state. Subsequently, the analytical balance 131 is controlled to read the value and obtain the weight M of the first crucible 1345. c1 ;

[0075] Step S3 further includes:

[0076] S31. The first magnetic device 132 is energized to generate a third magnetic force. Driven by the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343, causing the coupling frame 1343, the first crucible 1345, and the second crucible 1348 to move to a suspended state. Subsequently, the analytical balance 131 is controlled to read the value and the total weight M of the first crucible 1345 and the second crucible 1348 is obtained. c Based on formula Mc2 =M c -M c1 Obtain the weight M of the second crucible 1348. c2 ;

[0077] Step S4 further includes:

[0078] S41. The first magnetic device 132 is energized to generate a fourth magnetic force. Under the drive of the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343, causing the coupling frame 1343, the first crucible 1345, and the sample inside the first crucible 1345 to move to a suspended state. Then, the analytical balance 131 is controlled to read the value and obtain the total weight M of the first crucible 1345 and the sample inside the first crucible 1345. c3 Based on formula M s1 =M c3 -M c1 Obtain the sample weight M in the first crucible 1345 s1 .

[0079] Step S5 further includes:

[0080] S51. The first magnetic device 132 is energized to generate a fifth magnetic force. Under the drive of the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343. This causes the coupling frame 1343, the first crucible 1345, the sample in the first crucible 1345, the second crucible 1348, and the sample in the second crucible 1348 to move to a suspended state. Subsequently, the analytical balance 131 is controlled to read the value and obtain the total weight M of the first crucible 1345, the sample in the first crucible 1345, the second crucible 1348, and the sample in the second crucible 1348. c5 Based on formula M s2 =M c5 -M c3 -M c2 Obtain the sample weight M in the second crucible 1348 s2 .

[0081] When the first magnetic device 132 is in the OFF position, it is not energized and has no attraction to the second magnetic device 133. At this time, the coupling frame 1343 is located on the first support frame 1344, the second crucible 1348 is located on the second support frame 1347, and the second magnetic device 133, the fourth magnetic device 141, other weighing components 134, and the sample are all suspended under the support of the first support frame 1344 and the second support frame 1347. When it is necessary to weigh the sample, the first magnetic device 132 is first energized to generate a first magnetic force. The first lifting block 13421 moves within the coupling frame 1343 to a suspended state under the drive of the second magnetic device 133. At this time, only the second magnetic device 133, the fourth magnetic device 141, the first connecting rod 1341, and the second connecting rod 1342 are suspended. The reading of the analytical balance 131 is read, and the magnetic levitation balance 1 is zeroed.

[0082] After zeroing, the weight of the first crucible 1345 is measured. The first magnetic device 132 is energized to generate a second magnetic force. Driven by the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343, causing the coupling frame 1343 and the first crucible 1345 to move upward. After moving a certain distance, the magnetic force of the first magnetic device 132 is rapidly reduced, causing the first crucible 1345 to stop moving upward and be in a suspended state. At this time, the magnetic force generated by the first magnetic device 132 is greater. In addition to the aforementioned suspended parts, the coupling frame 1343, the first crucible 1345, and the third connecting rod 1346 are also in a suspended state. Subsequently, the analytical balance 131 is controlled to read the value and the weight M of the first crucible 1345 is obtained. c1 It is worth mentioning that the weights of the coupling frame 1343 and the third connecting rod 1346 are known and constant. Although not explicitly mentioned above, the weight M of the first crucible 1345 is obtained. c1 The weight of coupling frame 1343 and third connecting rod 1346 should be deducted.

[0083] Next, the weight of the second crucible 1348 is measured. The first magnetic device 132 is energized to generate a third magnetic force. Driven by the second magnetic device 133, the first lifting block 13421 moves a certain distance within the coupling frame 1343 and then abuts against the coupling frame 1343, causing the coupling frame 1343, the first crucible 1345, and the second crucible 1348 to move into a suspended state. At this time, the magnetic force generated by the first magnetic device 132 is greater than before. In addition to the previously suspended parts, the second crucible 1348 is also suspended. Subsequently, the analytical balance 131 is read and the total weight M of the first crucible 1345 and the second crucible 1348 is obtained. c Based on formula M c2 =Mc -M c1 The weight M of the second crucible 1348 can be obtained by subtracting the weight of the first crucible 1345 from the total weight of the first crucible 1345 and the second crucible 1348. c2 .

[0084] Then, the weight of the samples inside the first crucible 1345 and the second crucible 1348 is measured. After placing the samples into the first crucible 1345 and the second crucible 1348 respectively, the measurement process is similar to the aforementioned measurement process of the first crucible 1345 and the second crucible 1348. The total weight M of the samples inside the first crucible 1345 and the first crucible 1348 is measured. c3 Then, based on formula M s1 =M c3 -M c1 Obtain the sample weight M in the first crucible 1345 s1 The total weight M of the first crucible 1345, the sample inside the first crucible 1345, the second crucible 1348, and the sample inside the second crucible 1348 is measured. c5 Then, based on formula M s2 =M c5 -M c3 -M c2 Obtain the sample weight M in the second crucible 1348 s2 This will not be elaborated further here. It is worth mentioning that, in order to maintain the levitation state, the magnitude of the magnetic force generated by the first magnetic device 132 during the measurement of the weight of the samples inside the first crucible 1345 and the second crucible 1348 may be the same or different. Those skilled in the art can set the first magnetic device 132 to generate an appropriate magnetic force according to the actual situation.

[0085] Example 3

[0086] The aforementioned embodiment 2 mentioned that the magnetic force generated by the first magnetic device 132 attracts the second magnetic device 133, the fourth magnetic device 141, the weighing component 134, and the sample to a suspended state. Although this can be achieved by setting the magnitude and duration of the magnetic force generated by the first magnetic device 132, the suspended components only experience slight friction with the air, which may lead to instability such as floating. Therefore, this embodiment is proposed. In this embodiment, the magnetic levitation weighing module also includes a position sensor 135 disposed outside the sample chamber 113 and a position sensor 136 disposed inside the sample chamber 113. The position sensor 136 is mounted on the second connecting rod 1342, and the position sensor 135 is disposed to the side of the position sensor 136. The position sensor 135 can obtain the position information of the second magnetic device 133, the fourth magnetic device 141, the weighing component 134, and the sample through the position sensor 136. The position sensor 135 is communicatively connected to the controller of the magnetic levitation balance 1, as shown in Figures 1-13. The control method also includes:

[0087] S6. Control the position sensor 135 to acquire the position information of the weighing component 134 and / or the sample;

[0088] S7. Compare the position information of the weighing component 134 and / or the sample with the preset position information;

[0089] S8. Based on the comparison results, control the magnitude of the magnetic force generated by the first magnetic device 132;

[0090] S81. If the position information of the weighing component 134 and / or the sample is greater than the preset position information, the magnetic force generated by the first magnetic device 132 is reduced.

[0091] S82. If the position information of the weighing component 134 and / or the sample is less than the preset position information, the magnetic force generated by the first magnetic device 132 is increased.

[0092] S83. If the position information of the weighing component 134 and / or the sample is equal to the preset position information, then the magnetic force generated by the first magnetic device 132 remains unchanged.

[0093] Step S8 is followed by:

[0094] SD, acquire the number of times the magnitude of the magnetic force generated by the first magnetic device 132 is adjusted;

[0095] SE, compare the number of times the magnitude of the magnetic force generated by the first magnetic device 132 is adjusted with the preset number of times;

[0096] SF. If the number of times the first magnetic device 132 adjusts the magnitude of the generated magnetic force is greater than or equal to the preset number, then the magnetic force generated by the first magnetic device 132 is controlled to gradually decrease and eventually stop generating magnetic force.

[0097] In the above-described embodiment, during the measurement process of the magnetic levitation balance 1 of the present invention, the position sensor 135 can acquire the position information of the weighing component 134 and the sample. The position information of the weighing component 134 and the sample is compared with preset position information. If the position information of the weighing component 134 and the sample is greater than the preset position information, it indicates that the position of the weighing component 134 and the sample is too high (e.g., the second crucible 1348 is accidentally pulled up when measuring the weight of the first crucible 1345, or a similar situation). In order not to affect the measurement of the magnetic levitation balance 1, it is necessary to control the magnetic force generated by the first magnetic device 132 to decrease. Similarly, if the position information of the weighing component 134 and the sample is less than the preset position information, it indicates that the position of the weighing component 134 and the sample is too low (e.g., the coupling frame 1343 has not yet detached from the first support frame 1344 when measuring the weight of the first crucible 1345, or a similar situation). In this case, the magnetic force generated by the first magnetic device 132 is controlled to increase. If the position information of the weighing component 134 and the sample is equal to the preset position information, it indicates that the positions of the weighing component 134 and the sample are appropriate, and the magnetic force generated by the first magnetic device 132 remains unchanged. Therefore, when the magnetic levitation balance 1 of the present invention is weighing, when the weighing component 134 and the sample are in a suspended state, the position sensor 135 transmits the aforementioned position signal to the controller in real time. The controller adjusts the magnitude of the current of the first magnetic device 132 to adjust the magnitude of the attraction force of the first magnetic device 132 on the second magnetic device 133 in real time and at high frequency, thereby stabilizing the signal of the position sensor 135. This achieves stable levitation of the weighing component 134 and the sample, improving the measurement accuracy of the magnetic levitation balance 1.

[0098] In addition, this embodiment can also obtain the number of times the magnitude of the magnetic force generated by the first magnetic device 132 is adjusted, and compare it with the preset number. If the number of times the magnitude of the magnetic force generated by the first magnetic device 132 is adjusted is greater than or equal to the preset number, it means that after multiple adjustments, the weighing component 134 and the sample still cannot be stably suspended. Therefore, the magnetic force generated by the first magnetic device 132 is controlled to decrease slowly, so that the weighing component 134 and the sample slowly fall. After the coupling frame 1343 and the second crucible 1348 slowly fall onto the first support frame 1344 and the second support frame 1347 respectively, the first magnetic device 132 is finally controlled to stop generating magnetic force, so as to avoid damage to the connection between the weighing component 134 and the sample caused by continuous high-frequency multiple adjustments of the position of the weighing component 134 and the sample.

[0099] Example 4

[0100] The second magnetic device 133, the fourth magnetic device 141, the weighing component 134, and the sample, which are in a suspended state, may also exhibit spin or deflection. This embodiment is proposed to address this issue. In this embodiment, the number of third magnetic devices 141 is odd and they are centrally symmetrically distributed about the fourth magnetic device 141, or the number of third magnetic devices 141 is even and they are symmetrically distributed about the fourth magnetic device 141, as shown in Figure 14. The control method further includes:

[0101] SA, obtain the induced electromotive force of the third magnetic device 141;

[0102] SB, based on the induced electromotive force of the third magnetic device 141, controls the direction and / or magnitude of the magnetic force generated by the third magnetic device 141.

[0103] Step SB is followed by:

[0104] The magnitudes of the magnetic forces generated by the third magnetic device 141 are equal.

[0105] In the case of adopting the above-described embodiment, the process of eliminating rotation will be described first. When the fourth magnetic device 141 rotates, the magnetic field of the fourth magnetic device 141 changes. The change in magnetic field will generate an induced electromotive force on the third magnetic device 141. The controller acquires the induced electromotive force generated by the third magnetic device 141 and adjusts the direction and magnitude of the magnetic force generated by the third magnetic device 141 in real time based on the magnitude and trend of the induced electromotive force. This changes the direction and magnitude of the magnetic force applied by the third magnetic device 141 to the fourth magnetic device 141, so that the fourth magnetic device 141 stops rotating and is stably suspended.

[0106] Next, the process of eliminating the offset will be introduced. Since the third magnetic devices 141 are evenly distributed around the fourth magnetic device 141 in this embodiment, if the fourth magnetic device 141 is not centered in the sample chamber 113, there will inevitably be a difference in distance between it and the surrounding fourth magnetic devices 141. Therefore, at this time, the third magnetic devices 141 on the left and right are controlled to generate equal magnetic forces, so that the resultant force on the fourth magnetic device 141 is zero, thereby making the distance between the fourth magnetic device 141 and all the third magnetic devices 141 equal, that is, the fourth magnetic device 141 returns to the centered position.

[0107] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0108] Those skilled in the art will understand that the aforementioned magnetic levitation balance 1 also includes other known structures, such as processors, controllers, and memories. These memories include, but are not limited to, random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory, or registers. Processors include, but are not limited to, CPLD / FPGA, DSP, ARM processors, and MIPS processors. To avoid unnecessarily obscuring the embodiments of this disclosure, these known structures are not shown in the accompanying drawings.

[0109] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A magnetically levitated balance (1), characterized in that, The magnetically levitated balance (1) includes: The main module has a sample chamber (113) formed inside it; A magnetic levitation weighing module includes an analytical balance (131) and a first magnetic device (132) disposed outside the sample chamber (113), and a second magnetic device (133) and a weighing component (134) disposed inside the sample chamber (113). The first magnetic device (132) is connected to the analytical balance (131), and the second magnetic device (133) is connected to the weighing component (134). The weighing component (134) is used to hold the sample. The first magnetic device (132) can use magnetic force to lift the second magnetic device (133), the weighing component (134), and the sample and weigh them through the analytical balance (131). The stabilization module includes a third magnetic device (141) disposed outside the sample chamber (113) and a fourth magnetic device (142) disposed inside the sample chamber (113). The fourth magnetic device (142) is connected to the second magnetic device (133) and can drive the second magnetic device (133) and the weighing component (134) to move under the magnetic force of the third magnetic device (141) so that they are centered and do not rotate.

2. The magnetic levitation balance (1) according to claim 1, characterized in that, The first magnetic device (132) is an electromagnet, the second magnetic device (133) is a permanent magnet, the first magnetic device (132) is disposed above the second magnetic device (133), and / or, the third magnetic device (141) is an electromagnet, the fourth magnetic device (142) is a permanent magnet, the third magnetic device (141) is disposed to the side of the fourth magnetic device (142), and the first magnetic device (132), the third magnetic device (141) and the analytical balance (131) are all communicatively connected to the controller of the magnetic levitation balance (1).

3. The magnetic levitation balance (1) according to claim 2, characterized in that, The number of the third magnetic device (141) is one, or the number of the third magnetic device (141) is an odd number more than one and is centrally symmetrical about the fourth magnetic device (142), or the number of the third magnetic device (141) is an even number and is symmetrical about the fourth magnetic device (142).

4. The magnetic levitation balance (1) according to claim 3, characterized in that, The weighing component (134) includes a first connecting rod (1341) and a second connecting rod (1342). The two ends of the first connecting rod (1341) are respectively connected to the first ends of the second magnetic device (133) and the second connecting rod (1342). The second end of the second connecting rod (1342) is provided with a first lifting block (13421). The fourth magnetic device (142) is installed on the second connecting rod (1342). The weighing component (134) further includes a coupling frame (1343), a first support frame (1344), a first crucible (1345), and a third connecting rod (1346). The first crucible (1345) is used to hold the sample. The coupling frame (1343) is placed on the first support frame (1344) and connected to the first crucible (1345) through the third connecting rod (1346). A protective frame (114) is provided on the main module. The first support frame (1344) is installed on the protective frame (114). The first lifting block (13421) can move a distance in the coupling frame (1343) under the drive of the second magnetic device (133) and then abut against the coupling frame (1343), and drive the coupling frame (1343) and the first crucible (1345) to move to a suspended state away from the first support frame (1344).

5. The magnetic levitation balance (1) according to claim 4, characterized in that, The weighing component (134) further includes a second support frame (1347) and a settling plate / second crucible (1348). The second support frame (1347) is mounted on the protective frame (114). A second lifting block (13471) is fixedly installed on the third connecting rod (1346). The settling plate / second crucible (1348) is placed on the second support frame (1347) and slidably sleeved on the third connecting rod (1346). The settling plate / second crucible (1348) is located above the second lifting block (13471). The second lifting block (13471) can move a distance in mid-air under the drive of the coupling frame (1343) and then abut against the settling plate / second crucible (1348), and drive the settling plate / second crucible (1348) to move to a suspended state detached from the second support frame (1347).

6. The magnetic levitation balance according to claim 5, characterized in that, The magnetic force of the first magnetic device (132) on the second magnetic device (133) also includes a repulsive force. The first lifting block (13421) can also move downward under the drive of the second magnetic device (133), causing the coupling frame (1343), the first crucible (1345), the second lifting block (13471) and the settling plate / second crucible (1348) to fall down, and finally causing the settling plate / second crucible (1348) to land on the second support frame (1347), and causing the coupling frame (1343) to land on the first support frame (1344).

7. The magnetic levitation balance (1) according to claim 4, 5, or 6, characterized in that, The magnetic levitation weighing module also includes a position sensor (135) disposed outside the sample chamber (113) and a position sensor (136) disposed inside the sample chamber (113). The position sensor (136) is mounted on the second connecting rod (1342). The position sensor (135) is disposed to the side of the position sensor (136). The position sensor (135) can obtain the position information of the second magnetic device (133), the fourth magnetic device (142), the weighing component (134), and the sample through the position sensor (136). The position sensor (135) is communicatively connected to the controller of the magnetic levitation balance (1).

8. The magnetic levitation balance (1) according to claim 7, characterized in that, The main module includes a first pressure-resistant shell (111) and a second pressure-resistant shell (112). The second pressure-resistant shell (112) is detachably installed below the first pressure-resistant shell (111). The magnetic levitation balance (1) also includes a temperature control module. The temperature control module includes a constant temperature jacket (121) sleeved on the outside of the first pressure-resistant shell (111) and a high temperature jacket or electric heating jacket (122) sleeved on the outside of the second pressure-resistant shell (112). The third magnetic device (141) and / or the position sensor (135) are installed on the constant temperature jacket (121).

9. The magnetic levitation balance (1) according to claim 8, characterized in that, The first pressure-resistant shell (111) is provided with an air inlet (1111), and the second pressure-resistant shell (112) is provided with an air outlet (1121). The first pressure-resistant shell (111) and the second pressure-resistant shell (112) are respectively provided with a first flange (1112) and a second flange (1122). The first flange (1112) and the second flange (1122) are respectively provided with a first mounting hole and a second mounting hole. The first pressure-resistant shell (111) can be detachably installed with the second pressure-resistant shell (112) through the first mounting hole and the second mounting hole. And / or, the first pressure-resistant shell (111) and the second pressure-resistant shell (112) are made of high-pressure resistant materials, and the first pressure-resistant shell (111) is made of non-magnetic or weakly magnetic materials.

10. The magnetic levitation balance (1) according to claim 5, characterized in that, The end of the first connecting rod (1341) is provided with a thread / threaded hole, and the end of the corresponding second connecting rod (1342) is provided with a threaded hole / thread. The first connecting rod (1341) and the second connecting rod (1342) are detachably connected through the thread / threaded hole. And / or, the first lifting block (13421) and / or the second lifting block (13471) are conical; And / or, the upper and lower surfaces of the coupling frame (1343) are annular, and the upper and lower surfaces are connected and fixed by a support rod; And / or, the positions of the first support frame (1344) and the second support frame (1347) on the protective frame (114) are adjustable.

11. A control method for a magnetically levitated balance (1), characterized in that, The magnetic levitation balance (1) is the magnetic levitation balance (1) as described in claim 5, and the control method includes: Control the first magnetic device (132) to adjust to the ZP position for zeroing; The first magnetic device (132) is controlled to be adjusted to the MP1 position, and the analytical balance (131) is controlled to obtain the weight M of the first crucible (1345). c1 ; The first magnetic device (132) is controlled to be adjusted to the MP2 position, and the analytical balance (131) is controlled to obtain the weight M of the second crucible. c2 ; The first magnetic device (132) is controlled to be adjusted to the MP1 position, and the analytical balance (131) is controlled to obtain the weight M of the sample in the first crucible (1345). s1 ; The first magnetic device (132) is controlled to be adjusted to the MP2 position, and the analytical balance (131) is controlled to obtain the weight M of the sample in the second crucible. s2 .

12. The control method for a magnetically levitated balance (1) according to claim 11, characterized in that, The step "controlling the first magnetic device (132) to adjust to the ZP position for zeroing" further includes: The first magnetic device (132) is powered on and generates a first magnetic force, causing the first lifting block (13421) to move to a suspended state in the coupling frame (1343) under the drive of the second magnetic device (133), the reading of the analytical balance (131) is read, and the magnetic levitation balance (1) is zeroed.

13. The control method for a magnetically levitated balance (1) according to claim 11, characterized in that, Step "Control the first magnetic device (132) to adjust to the MP1 position and control the analytical balance (131) to obtain the weight M of the first crucible (1345) c1 "Further includes: The first magnetic device (132) is energized to generate a second magnetic force. Under the drive of the second magnetic device (133), the first lifting block (13421) moves a certain distance within the coupling frame (1343) and then abuts against the coupling frame (1343), causing the coupling frame (1343) and the first crucible (1345) to move to a suspended state. Subsequently, the analytical balance (131) is controlled to read the value and the weight M of the first crucible (1345) is obtained. c1 .

14. The control method for a magnetically levitated balance (1) according to claim 13, characterized in that, Step "Control the first magnetic device (132) to adjust to the MP2 position and control the analytical balance (131) to obtain the weight M of the second crucible" c2 "Further includes: The first magnetic device (132) is energized to generate a third magnetic force. Under the drive of the second magnetic device (133), the first lifting block (13421) moves a certain distance within the coupling frame (1343) and then abuts against the coupling frame (1343), causing the coupling frame (1343), the first crucible (1345), and the second crucible to move to a suspended state. Subsequently, the analytical balance (131) is controlled to read the value and the total weight M of the first crucible (1345) and the second crucible is obtained. c Based on formula M c2 =M c -M c1 Obtain the weight M of the second crucible c2 .

15. The control method for a magnetically levitated balance (1) according to claim 14, characterized in that, Step "Control the first magnetic device (132) to adjust to the MP1 position and control the analytical balance (131) to obtain the weight M of the sample in the first crucible (1345) s1 "Further includes: The first magnetic device (132) is energized to generate a fourth magnetic force. Under the drive of the second magnetic device (133), the first lifting block (13421) moves a certain distance within the coupling frame (1343) and then abuts against the coupling frame (1343), causing the coupling frame (1343), the first crucible (1345), and the sample inside the first crucible (1345) to move to a suspended state. Subsequently, the analytical balance (131) is controlled to read the value and the total weight M of the first crucible (1345) and the sample inside the first crucible (1345) is obtained. c3 Based on formula M s1 =M c3 -M c1 Obtain the sample weight M inside the first crucible (1345). s1 .

16. The control method for a magnetically levitated balance (1) according to claim 15, characterized in that, Step "Control the first magnetic device (132) to adjust to the MP2 position and control the analytical balance (131) to obtain the weight M of the sample in the second crucible" s2 "Further includes: The first magnetic device (132) is energized and generates a fifth magnetic force. Under the drive of the second magnetic device (133), the first lifting block (13421) moves a certain distance within the coupling frame (1343) and then abuts against the coupling frame (1343). This causes the coupling frame (1343), the first crucible (1345), the sample in the first crucible (1345), the second crucible, and the sample in the second crucible to move to a suspended state. Subsequently, the analytical balance (131) is controlled to read the value and the total weight M of the first crucible (1345), the sample in the first crucible (1345), the second crucible, and the sample in the second crucible is obtained. c5 Based on formula M s2 =M c5 -M c3 -M c2 Obtain the sample weight M in the second crucible. s2 .

17. The control method for a magnetically levitated balance (1) according to claim 11, characterized in that, The magnetic levitation weighing module further includes a position sensor (135) disposed outside the sample chamber (113) and a position sensor (136) disposed inside the sample chamber (113). The position sensor (136) is mounted on the second connecting rod (1342), and the position sensor (135) is disposed to the side of the position sensor (136). The position sensor (135) can obtain the position information of the second magnetic device (133), the fourth magnetic device (142), the weighing component (134), and the sample through the position sensor (136). The position sensor (135) is communicatively connected to the controller of the magnetic levitation balance (1). The control method further includes: The position sensor (135) is controlled to acquire the position information of the weighing component (134) and / or the sample; Compare the position information of the weighing component (134) and / or the sample with the preset position information; Based on the comparison results, the first magnetic device (132) is controlled to adjust the magnitude of the generated magnetic force; If the position information of the weighing component (134) and / or the sample is greater than the preset position information, the magnetic force generated by the first magnetic device (132) is reduced. If the position information of the weighing component (134) and / or the sample is less than the preset position information, then the magnetic force generated by the first magnetic device (132) is increased. If the position information of the weighing component (134) and / or the sample is equal to the preset position information, the magnetic force generated by the first magnetic device (132) remains unchanged.

18. The control method for a magnetically levitated balance (1) according to claim 11, characterized in that, The number of the third magnetic devices (141) is odd and they are centrally symmetrically distributed about the fourth magnetic device (142), or the number of the third magnetic devices (141) is even and they are symmetrically distributed about the fourth magnetic device (142). The control method further includes: Obtain the induced electromotive force of the third magnetic device (141); The direction and / or magnitude of the magnetic force generated by the third magnetic device (141) are controlled by the induced electromotive force of the third magnetic device (141).

19. The control method for a magnetically levitated balance (1) according to claim 18, characterized in that, The step "controlling the magnitude of the magnetic force generated by the third magnetic device (141) based on the induced electromotive force of the third magnetic device (141)" further includes: The magnitude of the magnetic force generated by the third magnetic device (141) is equal.

20. The control method for a magnetically levitated balance (1) according to claim 17, characterized in that, The step "based on the comparison result, control the first magnetic device (132) to adjust the magnitude of the generated magnetic force" further includes: The number of times the magnitude of the magnetic force generated by the first magnetic device (132) is adjusted is obtained; Compare the number of times the magnetic force generated by the first magnetic device (132) is adjusted with the number of preset times; If the number of times the first magnetic device (132) adjusts the magnitude of the generated magnetic force is greater than or equal to the preset number, then the magnetic force generated by the first magnetic device (132) is controlled to slowly decrease and eventually stop generating magnetic force.

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