Magnetic suspension balance and control method thereof

Abstract

The invention relates to the technical field of magnetic suspension measurement, in particular to a magnetic suspension balance and a control method thereof, and aims to solve the problems that a coil and a stator permanent magnet of an existing magnetic suspension balance are complex in assembly structure and difficult to disassemble and assemble, and the diameter of a reaction chamber of the magnetic suspension balance is large and the high-voltage-resistant level of the magnetic suspension balance is reduced due to the fact that the occupied space is large. The magnetic suspension balance comprises a sample chamber and a magnetic suspension weighing module, the magnetic suspension weighing module comprises an analytical balance, a first magnetic device, a second magnetic device and a weighing part, the first magnetic device is connected with the analytical balance, the second magnetic device is connected with the weighing part, and the weighing part is connected with a sample; the stabilizing module comprises a third magnetic device arranged outside the sample chamber and a fourth magnetic device arranged inside the sample chamber, and the fourth magnetic device is connected with the second magnetic device and can drive the second magnetic device to eliminate displacement, stop rotating and keep stable under the magnetic action of the third magnetic device.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension measurement, and specifically provides a magnetic suspension balance and a control method thereof. Background Art

[0002] As a precision weighing instrument, magnetic levitation balance is often used to measure small weight changes of test samples, such as gas adsorption experiments. Magnetic levitation balance includes electromagnet and permanent magnet. When the electromagnet is energized, the magnetic force generated attracts the permanent magnet to move upward, and the permanent magnet drives other parts of the weighing system to move upward and be in a suspended state. At this time, since there is only a very small friction between the gas and the horizontal direction, it will easily rotate and cannot stop for a long time. This phenomenon will cause fluctuations in the readings of the magnetic levitation balance, reducing the accuracy and stability of the magnetic levitation balance.

[0003] In order to solve the above problems, Chinese patent CN115540980A proposes a magnetic suspension balance and mass measurement method based on a three-actuator structure, wherein a stator permanent magnet and three coils with rotational symmetry are arranged above the mover permanent magnet, and a displacement sensor is arranged to feedback the position and posture information of the permanent magnet. After the stator permanent magnet and the coil are energized, the magnetic force generated by the stator permanent magnet and the coil acts together to make the permanent magnet stably suspended. The mass of the sample to be measured is obtained by measuring the current of the three coils, and the mass measurement error caused by the spin or shaking of the permanent magnet is avoided by changing the magnitude of the current of the three coils. However, since the magnetic suspension balance mentioned in the above patent document is a non-closed balance, its space itself is relatively large, and the larger space makes it easy to accommodate the complex structure assembled by the coil and the stator permanent magnet. As for the closed magnetic suspension balance, since the internal space of the closed magnetic suspension balance is relatively small, it cannot accommodate the complex coil and stator permanent magnet structure mentioned in the above patent document in both the vertical direction and the horizontal direction, and because the space occupied is relatively large, the reaction chamber diameter of the magnetic suspension balance is relatively large, and the high-voltage resistance level is reduced, which in turn affects the measurement of the magnetic suspension balance in a high-temperature and high-pressure environment. Therefore, although the above patent document has made improvements to the structure of a non-closed balance, it has little reference value for the design of a closed balance.

[0004] In view of this, the art needs a new magnetic suspension balance to solve the existing problems. Summary of the invention

[0005] The present invention aims to solve the above technical problems, namely, to solve the problems that the coil and stator permanent magnet of the existing magnetic levitation balance have a complex assembly structure and are difficult to disassemble, and because they occupy a large space, the reaction chamber diameter of the magnetic levitation balance is large and the high voltage resistance level is reduced.

[0006] In a first aspect, the present invention provides a magnetic levitation balance, which includes: a main body module, wherein a sample chamber is formed inside the main body module; a magnetic levitation weighing module, wherein the magnetic levitation weighing module includes an analytical balance and a first magnetic device arranged outside the sample chamber, and a second magnetic device and a weighing component arranged inside the sample chamber, wherein the first magnetic device is connected to the analytical balance, and the second magnetic device is connected to the weighing component, and the weighing component is used to hold a sample, and the first magnetic device can suck up the second magnetic device, the weighing component and the sample by magnetic force and weigh them by the analytical balance; a stabilization module, wherein the stabilization module includes a third magnetic device arranged outside the sample chamber and a fourth magnetic device arranged inside the sample chamber, wherein the fourth magnetic device is connected to the second magnetic device and can 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.

[0007] In a 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 arranged 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 arranged on 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.

[0008] In a specific embodiment of the above-mentioned magnetic levitation balance, the number of the third magnetic devices is one, or the number of the third magnetic devices is an odd number greater than one and is centrally symmetrically distributed about the fourth magnetic device, or the number of the third magnetic devices is an even number and is symmetrically distributed about the fourth magnetic device.

[0009] In a 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, and 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 samples, the coupling frame is placed on the first support frame and is connected to the first crucible through the third connecting rod, a protective frame is provided on the main body module, the first support frame is installed on the protective frame, and the first lifting block can be driven by the second magnetic device to move in the coupling frame for a distance in the air and then abut against the coupling frame, and drive the coupling frame and the first crucible to move to a suspended state away from the first support frame.

[0010] In a specific embodiment of the above-mentioned magnetic levitation balance, the weighing component also includes a second support frame and a sinker / second crucible, the second support frame is installed on the protective frame, a second lifting block is fixedly provided on the third connecting rod, the sinker / second crucible is placed on the second support frame and slidably mounted on the third connecting rod, the sinker / second crucible is located above the second lifting block, and the second lifting block can be driven by the coupling frame to move in the air for an end distance and then abut against the sinker / second crucible, thereby driving the sinker / second crucible to move to a suspended state separated from the second support frame.

[0011] In a 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, and 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 sinker / second crucible to descend, and finally making the sinker / second crucible land on the second support frame, and making the coupling frame land on the first support frame.

[0012] In a specific embodiment of the above-mentioned magnetic levitation balance, the magnetic levitation weighing module also includes a position sensor arranged outside the sample chamber and a position sensor arranged inside the sample chamber, the position sensor is installed on the second connecting rod, and the position sensor is arranged on 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, and the position sensor is communicatively connected to the controller of the magnetic levitation balance.

[0013] In a specific embodiment of the above-mentioned magnetic levitation balance, the main body 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 mounted on the outside of the first pressure-resistant shell and a high-temperature jacket or an electric heating jacket mounted on the outside of the second pressure-resistant shell, and the third magnetic device and / or the position sensor are installed on the constant temperature jacket.

[0014] In a specific embodiment of the above-mentioned magnetic levitation balance, an air inlet is provided on the first pressure-resistant shell, an air outlet is provided on the second pressure-resistant shell, a first flange and a second flange are respectively provided on the first pressure-resistant shell and the second pressure-resistant shell, a first mounting hole and a second mounting hole are respectively provided on the first flange and the second flange, and the first pressure-resistant shell is detachably mounted 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 material.

[0015] In a specific embodiment of the above-mentioned magnetic levitation balance, a thread / threaded hole is provided at the end of the first connecting rod, and a threaded hole / thread is provided at the end of the corresponding second connecting rod, and the first connecting rod and the second connecting rod are detachably connected via 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 circular ring-shaped, 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.

[0016] The present invention also provides a control method for a magnetic suspension balance, the magnetic suspension balance comprising any one of the above technical solutions, the control method comprising: controlling the first magnetic device to adjust to the ZP gear to perform zeroing; controlling the first magnetic device to adjust to the MP1 gear and controlling the analytical balance to obtain the weight M of the first crucible. c1 ; Control the first magnetic device to adjust to the MP2 gear and control the analytical balance to obtain the weight M of the second crucible c2 ; Control the first magnetic device to adjust to the MP1 gear and control the analytical balance to obtain the weight M of the sample in the first crucible s1 ; Control the first magnetic device to adjust to the MP2 gear and control the analytical balance to obtain the weight M of the sample in the second crucible s2 .

[0017] In the specific implementation of the above-mentioned control method for the magnetic levitation balance, the step of "controlling the first magnetic device to adjust to the ZP position for zeroing" further includes: controlling the first magnetic device to be energized and generate a first magnetic force, so that the first lifting block moves to a suspended state in 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 be zeroed.

[0018] In the specific implementation of the control method for the magnetic suspension balance, the step of "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"c1 "further comprises: controlling the first magnetic device to be powered on and generate a second magnetic force, the first lifting block is driven by the second magnetic device to move a certain distance in the coupling frame and then abut against the coupling frame, and drives the coupling frame and the first crucible to move to a suspended state, and then controlling the analytical balance to read and obtain the weight M of the first crucible. c1 .

[0019] In the specific implementation of the control method for the magnetic suspension balance, the step of "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" c2 " further comprises: controlling the first magnetic device to be powered on and generate a third magnetic force, the first lifting block is driven by the second magnetic device to move a certain distance in the coupling frame and then abut against the coupling frame, and drives the coupling frame, the first crucible and the second crucible to move to a suspended state, and then controlling the analytical balance to read and obtain the total weight M of the first crucible and the second crucible. c , based on formula M c2 =M c -M c1 Get the weight M of the second crucible c2 .

[0020] In the specific implementation of the control method for the magnetic suspension balance, the step of "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 comprises: controlling the first magnetic device to be powered on and generate a fourth magnetic force, the first lifting block is driven by the second magnetic device to move a certain distance in the coupling frame and then abuts against the coupling frame, and drives the coupling frame, the first crucible and the sample in the first crucible to move to a suspended state, and then controlling the analytical balance to read and obtain the total weight M of the first crucible and the sample in the first crucible c3 , based on formula M s1 =M c3 -M c1 Get the sample weight M in the first crucible s1 .

[0021] In the specific implementation of the control method for the magnetic suspension balance, the step of "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 comprises: controlling the first magnetic device to be energized and generate a fifth magnetic force, the first lifting block is driven by the second magnetic device to move a certain distance in the coupling frame and then abut against the coupling frame, and drives the coupling frame, the first crucible, the sample in the first crucible, the second crucible and the sample in the second crucible to move to a suspended state, and then controlling the analytical balance to read and obtain 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 Get the sample weight M in the second crucible s2 .

[0022] In a specific embodiment of the control method for the magnetic suspension balance, the magnetic suspension weighing module further includes a position sensor arranged outside the sample chamber and a position sensor arranged inside the sample chamber, the position sensor is installed on the second connecting rod, and the position sensor is arranged on 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, and the position sensor is communicatively connected with the controller of the magnetic suspension balance. The control method further includes: controlling the position sensor to obtain the position information of the weighing component and / or the sample; comparing the size of the position information of the weighing component and / or the sample with the size of the preset position information; controlling the first magnetic device to adjust the size of the magnetic force generated based on the comparison result; if the position information of the weighing component and / or the sample is greater than the preset position information, 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, 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, controlling the magnetic force generated by the first magnetic device to remain unchanged.

[0023] In a specific implementation of the above-mentioned control method for a magnetic levitation balance, the number of the third magnetic devices is an odd number and they are centrally symmetrically distributed about the fourth magnetic device, or the number of the third magnetic devices is an even number and they are symmetrically distributed about the fourth magnetic device. The control method further includes: obtaining 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.

[0024] In a specific implementation of the above-mentioned control method for a magnetic levitation balance, the step of "controlling the magnitude of the magnetic force generated by the third magnetic device based on the induced electromotive force of the third magnetic device" also includes: controlling the magnitude of the magnetic force generated by the third magnetic device to be equal.

[0025] In the specific implementation of the above-mentioned control method for a magnetic levitation balance, the step of "controlling the magnitude of the magnetic force generated by adjusting the first magnetic device based on the comparison result" also includes: obtaining the number of times the first magnetic device adjusts the magnitude of the magnetic force generated; comparing the number of times the first magnetic device adjusts the magnitude of the magnetic force generated with a preset number of times; if the number of times the first magnetic device adjusts the magnitude of the magnetic force generated is greater than or equal to the preset number of times, controlling the magnetic force generated by the first magnetic device to slowly decrease and eventually stop generating magnetic force.

[0026] The technical effect of the present invention is as follows: during the operation of the magnetic suspension balance of the present invention, when the second magnetic device, the fourth magnetic device, and the weighing component and the sample inside the sample chamber spin or deflect, 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, so that the magnetic suspension balance of the present invention can adjust the posture of the second magnetic device, the fourth magnetic device, the weighing component and the sample in the sample chamber to avoid affecting the reading accuracy of the magnetic suspension balance due to their spin and deflection. Since the stabilization modules of the magnetic levitation balance are respectively arranged outside and inside the sample chamber in the present invention, the complexity of the assembly structure inside the sample chamber is reduced, thereby reducing the occupation of the internal space of the sample chamber, and solving the problems that the coil and stator permanent magnet of the existing magnetic levitation balance have a complex assembly structure and are difficult to assemble and disassemble, and the reaction chamber of the magnetic levitation balance has a larger diameter and a lower high-voltage resistance level due to the large occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic diagram of the overall structure of the magnetic suspension balance of the present invention;

[0029] Figure 2 It is a schematic diagram of the OFF position of the magnetic suspension balance of the present invention;

[0030] Figure 3 It is a schematic diagram of the ZP position of the magnetic suspension balance of the present invention;

[0031] Figure 4It is a schematic diagram of the MP1 position of the magnetic suspension balance of the present invention;

[0032] Figure 5 It is a schematic diagram of the MP2 position of the magnetic suspension balance of the present invention;

[0033] Figure 6 This is the main flow chart of the second embodiment of the present invention;

[0034] Figure 7 is a flowchart of step S1 in embodiment 2 of the present invention;

[0035] Figure 8 is a flow chart of step S2 in the second embodiment of the present invention;

[0036] Fig. 9 is a flow chart of step S3 in embodiment 2 of the present invention;

[0037] Fig.10 is a flow chart of step S4 in the second embodiment of the present invention;

[0038] Fig.11 is a flow chart of step S5 in the second embodiment of the present invention;

[0039] Fig.12 This is the main flow chart of Embodiment 3 of the present invention;

[0040] Fig.13 is a flow chart of steps SD, SE, and SF in embodiment 3 of the present invention;

[0041] Fig.14 It is a flow chart of embodiment 4 of the present invention.

[0042] List of reference numerals:

[0043] 1-magnetic suspension 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-protection frame; 121-constant temperature jacket; 122-high temperature jacket / electric heating jacket; 131-analytical balance; 132-first magnetic device; 133-second magnetic device; 134-weighing component; 1341 -first connecting rod; 1342-second connecting rod; 13421-first lifting block; 1343-coupling frame; 1344-first supporting frame; 1345-first crucible; 1346-third connecting rod; 1347-second supporting 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 DESCRIPTION

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0045] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Embodiment 1

[0048] like Figure 1-Figure 5 As shown, in order to solve the problems that the coil and the stator permanent magnet of the existing magnetic suspension balance 1 have a complex assembly structure and are difficult to disassemble, and that the reaction chamber of the magnetic suspension balance 1 has a large diameter and a reduced high-voltage resistance level due to the large space occupied, the magnetic suspension balance 1 of the present invention includes:

[0049] The main body module includes a first pressure-resistant shell 111 and a second pressure-resistant shell 112. The first pressure-resistant shell 111 is detachably mounted above the second pressure-resistant shell 112. The first pressure-resistant shell 111 and the second pressure-resistant shell 112 are made of high-pressure resistant materials. The first pressure-resistant shell 111 is made of non-magnetic or weakly magnetic materials. Sample chambers 113 are formed inside the first pressure-resistant shell 111 and the second pressure-resistant shell 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. 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 (not shown in the figure). The first pressure-resistant shell 111 is detachably mounted with the second pressure-resistant shell 112 through the first mounting hole and the second mounting hole. A protective frame 114 is also provided on the inner side of the first pressure-resistant shell 111.

[0050] 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 an electric heating jacket 122 sleeved on the outside of the second pressure-resistant shell 112 .

[0051] The magnetic suspension 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 first magnetic device 132 is an electromagnet, and the first magnetic device 132 is disposed above the second magnetic device 133. The second magnetic device 133 is a permanent magnet, and the second magnetic device 133 is connected to the weighing component 134. The weighing component 134 includes, from top to bottom, a first connecting rod 1341, a second connecting rod 1342, a first lifting block 13421, a coupling frame 1343, a first supporting frame 1344, a third connecting rod 1346, a sinker / second crucible 1348, a second supporting 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, and 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 provided on the second end of the second connecting rod 1342 and is located in the coupling frame 1343 and 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 surface and the lower surface of the coupling frame 1343 are annular, and the upper surface and the lower surface are connected and fixed by the support rod. The first support frame 1344 is installed on the protection frame 114 and the position of the first support frame 1344 on the protection frame 114 is adjustable. The sedimentation plate / second crucible 1348 is placed on the second support frame 1347 and a through hole is provided in the middle area of ​​the sedimentation plate / second crucible 1348 so that it can be slidably mounted on the third connecting rod 1346. The second support frame 1347 is mounted on the protection frame 114. The position of the second support frame 1347 on the protection frame 114 is adjustable. The second lifting block 13471 is fixedly arranged on the third connecting rod 1346 and is located below the sedimentation plate / second crucible 1348. The second lifting block 13471 is conical. The magnetic suspension weighing module also includes a position sensor 135 arranged outside the sample chamber 113 and a position sensor 136 arranged inside the sample chamber 113. The position sensor 136 is mounted on the second connecting rod 1342. The position sensor 135 is arranged on the side of the position sensor 136 and is mounted on the constant temperature jacket 121.

[0052] The stabilization module includes a third magnetic device 141 arranged outside the sample chamber 113 and a fourth magnetic device 141 arranged inside the sample chamber 113. The fourth magnetic device 141 is installed on the second connecting rod 1342. There are four third magnetic devices 141 and they are distributed and installed 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.

[0053] The first magnetic device 132, the third magnetic device 141, the analytical balance 131 and the position sensor 135 are all connected to the controller of the magnetic suspension balance 1. The first crucible 1345 and the second crucible are used to hold samples.

[0054] In the case of adopting the above-mentioned embodiment, the second crucible 1348 placed on the second support frame 1347 is used as an example for introduction. During the use of the magnetic suspension balance 1 of the present invention, the first pressure-resistant shell 111 and the second pressure-resistant shell 112 are opened and the samples to be tested are 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 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 is started. The controller controls the first magnetic device 132 to generate magnetic force (attractive force). 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. The first lifting block 13421 moves upward in the coupling frame 1343 for a distance and then abuts against the top surface of the coupling frame 1343, thereby driving the coupling frame 1343 and the first crucible 1345 connected thereto via the third connecting rod 1346 (including the second lifting block 13471 arranged on the third connecting rod 1346) and the sample in the first crucible 1345 to move upward, and the second magnetic device 133, the fourth magnetic device 141, the weighing component 134 and the sample can be obtained through the position sensor 135 and the position sensor 136. The position information of the coupling frame 1343 can be used to determine whether it has moved to a suspended state separated from the first support frame 1344. When the coupling frame 1343 moves to a suspended state separated 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 is not in contact with the second crucible 1348 at this time. After judging 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, so that under the magnetic force of the first magnetic device 132, the second magnetic device 133 drives the coupling frame 1343 indirectly connected thereto to continue to move upward, and 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 separated 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 is stable, the weight of the sample in the second crucible 1348 can be obtained by reading the analytical balance 131.

[0055] 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, driving the coupling frame 1343, the first crucible 1345, the second lifting block 13471 and the sedimentation plate / second crucible 1348 to descend, and finally making the sedimentation plate / second crucible 1348 land on the second support frame 1347, and making the coupling frame 1343 land on the first support frame 1344.

[0056] In the process of measuring the weight of the sample, especially when the analytical balance 131 reads the reading, since the second magnetic device 133, the fourth magnetic device 141, the weighing component 134 and the sample in the sample chamber 113 have only a very small friction with the gas in the horizontal direction, the second magnetic device 133, the fourth magnetic device 141, the weighing component 134 and the sample are prone to spin or deflection, and cannot stop for a long time, resulting in fluctuations in the reading of the analytical balance 131 and reduced accuracy. For this reason, a stabilization module is also provided in this embodiment. Since four symmetrically distributed third magnetic devices 141 (electromagnets) are arranged on the constant temperature jacket 121 outside the first pressure-resistant shell 111, when the fourth magnetic device 141 spins, the change of its magnetic field will cause an induced electromotive force to be generated in the four third magnetic devices 141. The induced electromotive force is measured in real time by the controller through the third magnetic devices 141, and the voltage applied to both ends of each third magnetic device 141 is adjusted in real time according to the size and change trend of the induced electromotive force, thereby changing the size of the force (including attractive force 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 stably suspend. When the fourth magnetic device 141 is offset, the attraction force generated by the four third magnetic devices 141 on the fourth magnetic device 141 is uneven, which will cause uneven force on the fourth magnetic device 141. At this time, the controller controls the voltages applied to both ends of the four third magnetic devices 141 to be equal, and the fourth magnetic device 141 will automatically return to the center position under the influence of the magnetic force.

[0057] The advantage of the above embodiment is that the magnetic force of the third magnetic device 141 on the fourth magnetic device 141 is adjusted by adjusting the size / direction of the magnetic force generated by the third magnetic device 141. 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, so that the magnetic suspension balance 1 of the present invention can adjust the posture of the second magnetic device 133, the fourth magnetic device 141, the weighing component 134 and the sample in the sample chamber 113 to avoid their spin and offset that affects the reading accuracy of the magnetic suspension balance 1. Furthermore, since the stabilization modules of the magnetic levitation balance 1 are respectively arranged outside and inside the sample chamber 113 in the present invention, the complexity of the assembly structure inside the sample chamber 113 is reduced, thereby reducing the occupation of the internal space of the sample chamber 113, thereby solving the problems that the coil and the stator permanent magnet of the existing magnetic levitation balance 1 have a complex assembly structure and are difficult to assemble and disassemble, and the reaction chamber diameter of the magnetic levitation balance 1 is larger due to the larger occupied space, and the high-voltage resistance level is reduced.

[0058] In addition, since the magnetic suspension balance 1 is often used to measure small weight changes of test samples, such as gas / liquid adsorption experiments, an air inlet 1111 and an air outlet 1121 (or a liquid inlet and a liquid outlet) are respectively provided on the first pressure-resistant shell 111 and the second pressure-resistant shell 112 in this embodiment. At the same time, by providing a constant temperature jacket 121 on the outside of the first pressure-resistant shell 111 and a high-temperature heating jacket or an electric heating jacket 122 on the outside of the second pressure-resistant shell 112, the magnetic suspension balance 1 of the present invention can select a suitable heating device according to the temperature requirements of the experiment, such as selecting a high-temperature jacket at -40 to +150°C, and circulating liquid flowing through the high-temperature jacket can keep the sample area inside the second pressure-resistant shell 112 at the target temperature. When the required temperature is >150°C, select an electric heating jacket. The first pressure-resistant shell 111 is covered with a constant temperature jacket 121, and the liquid flowing through the inside is kept at a constant temperature of 80°C. Its function is to keep the parts in the first pressure-resistant shell 111 in a constant temperature range where they can work normally regardless of whether the second pressure-resistant shell 112 and the sample are in a low-temperature or high-temperature state.

[0059] In addition, in this embodiment, the first magnetic device 132 and the third magnetic device 141 (both are electromagnets) are arranged outside the sample chamber 113. In addition to the aforementioned ability to simplify the internal structure of the sample chamber 113 and reduce space occupancy, since the circuit is arranged outside the sample chamber 113 and does not contact the atmosphere in the sample chamber 113, the magnetic suspension balance 1 of the present invention can also be applied to experiments in flammable and explosive gases and high temperature and high pressure environments. Of course, those skilled in the art can also 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, such as setting the second magnetic device 133 and / or the fourth magnetic device 141 as an electromagnetic device, and these changes are within the protection scope of the present invention.

[0060] In addition, regarding the connection method between the first connecting rod 1341 and the second connecting rod 1342 mentioned above, technicians in this field can also set it to other common connection methods, such as snap-on or sleeve connection, etc. The above-mentioned 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, technicians in this field can also make routine adjustments according to actual needs. As long as they can play the same role, these changes do not exceed the technical principles of the present invention, and therefore will also be included in the protection scope of the present invention. In addition, it is also mentioned in this embodiment that the positions of the first support frame 1344 and the second support frame 1347 installed on the protection frame 114 are adjustable, so that the magnetic suspension balance 1 of the present invention can adjust the positions of the first support frame 1344 and the second support frame 1347 according to the test sample.

[0061] Regarding the number of the third magnetic devices 141, those skilled in the art will understand that, although it is mentioned above that four third magnetic devices 141 are provided, this is not the only implementation method, and those skilled in the art may also set the number of the third magnetic devices 141 to any other even number, as long as they are symmetrically distributed on the sides of the fourth magnetic device 141. Alternatively, those skilled in the art may also set the number of the third magnetic devices 141 to an odd number greater than one, and the third magnetic devices 141 are symmetrically distributed on the sides of the fourth magnetic device 141. The technical principles of these implementation methods are consistent with the technical principles of the aforementioned four third magnetic devices 141, and will not be repeated here. It is also worth mentioning that the technicians in this field can also set the number of the third magnetic device 141 to one. In this way, in the process of adjusting the spin and offset of the fourth magnetic device 141, the third magnetic device 141 can be controlled to be powered on and 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, since the same poles of the magnets repel each other and the opposite poles attract each other, the N pole of the fourth magnetic device 141 is away from the third magnetic device 141 due to the repulsive force, and the S pole of the fourth magnetic device 141 is close to the third magnetic device 141 due to the attractive force and finally faces the third magnetic device 141, so that the fourth magnetic device 141 can be controlled to stop rotating. However, at this time, the fourth magnetic device 141 is offset due to being attracted by the third magnetic device 141. Therefore, after the fourth magnetic device 141 stops rotating, the magnetic force size and direction of the third magnetic device 141 are adjusted to make the fourth magnetic device 141 away from the third magnetic device 141 and finally vertically located at the center of the sample chamber 113.

[0062] The above-mentioned embodiment introduces the scheme of measuring the weight of two samples by 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 a possible embodiment, the magnetic levitation balance 1 of the present invention can also replace the second crucible 1348 with a sinker. The process of measuring the weight of the sinker 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 sinker is measured by the analytical balance 131, and the volume Vsinker and Msinker of the sinker measured in advance are added. The density ρ of the gas, liquid or supercritical fluid in the sample chamber 113 can be calculated by the formula ρ=(Msinker-M) / Vsinker.

[0063] Embodiment 2

[0064] The present invention also provides a control method for a magnetic suspension balance 1, wherein the magnetic suspension balance 1 is the magnetic suspension balance 1 in the first embodiment. Figure 1-Figure 11 As shown, the control method includes:

[0065] S1, controlling the first magnetic device 132 to adjust to the ZP position for zeroing;

[0066] 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 ;

[0067] S3, controlling the first magnetic device 132 to adjust to the MP2 position and controlling the analytical balance 131 to obtain the weight M of the second crucible 1348 c2 ;

[0068] S4, control the first magnetic device 132 to adjust to the MP1 gear and control the analytical balance 131 to obtain the weight M of the sample in the first crucible 1345 s1 ;

[0069] S5, control the first magnetic device 132 to adjust to the MP2 gear and control the analytical balance 131 to obtain the weight M of the sample in the second crucible 1348 s2 .

[0070] In the above steps, step S1 further comprises:

[0071] S11, controlling the first magnetic device 132 to be energized and generate a first magnetic force, so that the first lifting block 13421 is driven by the second magnetic device 133 to move to a suspended state in the coupling frame 1343, reading the reading of the analytical balance 131, and controlling the magnetic suspension balance 1 to be reset;

[0072] Step S2 further comprises:

[0073] S21, control the first magnetic device 132 to be powered on and generate a second magnetic force, and the first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 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, and then control the analytical balance 131 to read and obtain the weight M of the first crucible 1345 c1 ;

[0074] Step S3 further comprises:

[0075] S31, control the first magnetic device 132 to be powered on and generate a third magnetic force, and the first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 and then abut against the coupling frame 1343, and drive the coupling frame 1343, the first crucible 1345 and the second crucible 1348 to move to a suspended state, and then control the analytical balance 131 to read and obtain the total weight M of the first crucible 1345 and the second crucible 1348 c, based on formula M c2 =M c -M c1 Get the weight M of the second crucible 1348 c2 ;

[0076] Step S4 further comprises:

[0077] S41, control the first magnetic device 132 to be powered on and generate a fourth magnetic force, and the first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 and then abut against the coupling frame 1343, and drive the coupling frame 1343, the first crucible 1345 and the sample in the first crucible 1345 to move to a suspended state, and then control the analytical balance 131 to read and obtain the total weight M of the first crucible 1345 and the sample in 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 .

[0078] Step S5 further comprises:

[0079] S51, control the first magnetic device 132 to be powered on and generate the fifth magnetic force, the first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 and then abut against the coupling frame 1343, and drive 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, and then control the analytical balance 131 to read 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 .

[0080] In the case of adopting the above embodiment, when the first magnetic device 132 is in the OFF position, the first magnetic device 132 is not powered on, and there is 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 in a suspended state under the support of the first support frame 1344 and the second support frame 1347. When the sample needs to be weighed, the first magnetic device 132 is first controlled to be powered on and generate the first magnetic force. The first lifting block 13421 is driven by the second magnetic device 133 to move to a suspended state in the coupling frame 1343. 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 in a suspended state, the reading of the analytical balance 131 is read, and the magnetic suspension balance 1 is controlled to be reset.

[0081] After the zeroing is completed, the weight of the first crucible 1345 is measured, the first magnetic device 132 is controlled to be powered on and generate the second magnetic force, and the first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 and then abut against the coupling frame 1343, and drive 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 controlled to decrease rapidly, so that the first crucible 1345 stops moving upward and is in a suspended state. At this time, the magnetic force generated by the first magnetic device 132 is greater. In addition to the aforementioned parts in a suspended state, the coupling frame 1343, the first crucible 1345 and the third connecting rod 1346 are also in a suspended state. Then the analytical balance 131 is controlled to read and obtain the weight M of the first crucible 1345. c1 It is worth mentioning that the weight of the coupling frame 1343 and the third connecting rod 1346 is known and unchanged. Although it is not explicitly mentioned above, the weight M of the first crucible 1345 can be obtained. c1 The weight of the coupling frame 1343 and the third connecting rod 1346 should be subtracted.

[0082] Next, the weight of the second crucible 1348 is measured, and the first magnetic device 132 is controlled to be powered on and generate a third magnetic force. The first lifting block 13421 is driven by the second magnetic device 133 to move a certain distance in the coupling frame 1343 and then abut against the coupling frame 1343, and drives the coupling frame 1343, the first crucible 1345 and the second crucible 1348 to move to a suspended state. At this time, the magnetic force generated by the first magnetic device 132 is greater than the above. In addition to the above-mentioned parts in the suspended state, the second crucible 1348 is also in the suspended state. Then, the analytical balance 131 is controlled to read and obtain the total weight M of the first crucible 1345 and the second crucible 1348. 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 .

[0083] Then, the weight of the samples in the first crucible 1345 and the second crucible 1348 is measured. After the samples are placed in the first crucible 1345 and the second crucible 1348, respectively, the measurement process is similar to the aforementioned process of measuring the first crucible 1345 and the second crucible 1348, and the total weight M of the samples in the first crucible 1345 and the second 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 in the first crucible 1345, the second crucible 1348, and the sample in the second crucible 1348 can be 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 It is worth mentioning that, in order to maintain the suspension state, the magnitude of the magnetic force generated by the first magnetic device 132 during the measurement of the weight of the sample inside the first crucible 1345 and the second crucible 1348 may be the same or different, and those skilled in the art can set the first magnetic device 132 to generate a suitable magnetic force according to the actual situation.

[0084] Embodiment 3

[0085] The aforementioned second embodiment 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 time of the magnetic force generated by the first magnetic device 132, since the above-mentioned components in the suspended state have only a slight friction with the air, their suspended state is very likely to be unstable such as floating. For this reason, the present embodiment is proposed. In the present embodiment, the magnetic suspension weighing module also includes a position sensor 135 arranged outside the sample chamber 113 and a position sensor 136 arranged inside the sample chamber 113. The position sensor 136 is installed on the second connecting rod 1342. The position sensor 135 is arranged on 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 with the controller of the magnetic suspension balance 1, such as Figure 1-Figure 13 As shown, the control method also includes:

[0086] S6, controlling the position sensor 135 to obtain the position information of the weighing component 134 and / or the sample;

[0087] S7, comparing the position information of the weighing component 134 and / or the sample with the preset position information;

[0088] S8, controlling the magnitude of the magnetic force generated by the first magnetic device 132 based on the comparison result;

[0089] S81, if the position information of the weighing component 134 and / or the sample is greater than the preset position information, controlling the magnetic force generated by the first magnetic device 132 to decrease;

[0090] S82, if the position information of the weighing component 134 and / or the sample is less than the preset position information, controlling the magnetic force generated by the first magnetic device 132 to increase;

[0091] S83. 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 is controlled to remain unchanged.

[0092] After step S8, the following steps are also included:

[0093] SD, obtaining the number of times the first magnetic device 132 adjusts the magnitude of the magnetic force generated;

[0094] SE, comparing the number of times the first magnetic device 132 adjusts the magnitude of the magnetic force generated with a preset number of times;

[0095] 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 a preset number, the magnetic force generated by the first magnetic device 132 is controlled to slowly decrease and eventually stop generating the magnetic force.

[0096] In the case of adopting the above-mentioned embodiment, during the measurement process of the magnetic suspension balance 1 of the present invention, the position information of the weighing component 134 and the sample can be obtained through the position sensor 135, and the size of the position information of the weighing component 134 and the sample is compared with the preset position information. If the position information of the weighing component 134 and the sample is greater than the preset position information, it means that the position of the weighing component 134 and the sample is too high at this time (for example, when measuring the weight of the first crucible 1345, the second crucible 1348 is pulled up by mistake, etc.), in order not to affect the measurement of the magnetic suspension 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 means that the position of the weighing component 134 and the sample is too low at this time (for example, when measuring the weight of the first crucible 1345, the coupling frame 1343 has not yet separated from the first support frame 1344, etc.), 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 means that the positions of the weighing component 134 and the sample are appropriate at this time, and the magnetic force generated by the first magnetic device 132 is controlled to remain unchanged. Therefore, when the magnetic suspension balance 1 of the present invention is weighed, when the weighing component 134 and the sample are in a suspended state, the position sensor 135 transmits the above position signal to the controller in real time, and the controller adjusts the magnitude of the attraction of the first magnetic device 132 to the second magnetic device 133 in real time and at high frequency by adjusting the magnitude of the current of the first magnetic device 132, so that the signal of the position sensor 135 is stable, and the stable suspension of the weighing component 134 and the sample can be achieved, thereby improving the measurement accuracy of the magnetic suspension balance 1.

[0097] In addition, in this embodiment, the number of times the first magnetic device 132 adjusts the size of the magnetic force generated can be obtained and compared with the size of the preset number. If the number of times the first magnetic device 132 adjusts the size of the magnetic force generated is greater than or equal to the preset number, it means that the weighing component 134 and the sample are still unable to stably suspend after multiple adjustments. Therefore, the magnetic force generated by the first magnetic device 132 is controlled to slowly decrease, so that the weighing component 134 and the sample slowly descend. 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 to avoid continuous high-frequency multiple adjustments of the positions of the weighing component 134 and the sample causing damage to the connection between the weighing component 134 and the sample.

[0098] Embodiment 4:

[0099] The second magnetic device 133, the fourth magnetic device 141, the weighing component 134 and the sample in the suspended state may also be subject to spin or offset. For this reason, the present embodiment is proposed. In the present embodiment, the number of the third magnetic devices 141 is an odd number and they are centrally symmetrically distributed about the fourth magnetic device 141, or the number of the third magnetic devices 141 is an even number and they are symmetrically distributed about the fourth magnetic device 141, such as Fig.14 As shown, the control method also includes:

[0100] SA, obtaining the induced electromotive force of the third magnetic device 141;

[0101] SB. Based on 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 is controlled.

[0102] Step SB also includes:

[0103] SC, control the magnetic force generated by the third magnetic device 141 to be equal in magnitude.

[0104] In the case of adopting the above embodiment, the process of eliminating rotation is first described. When the fourth magnetic device 141 rotates, the magnetic field of the fourth magnetic device 141 will change, and the change in the magnetic field will generate an induced electromotive force on the third magnetic device 141. The controller obtains 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 change trend of the induced electromotive force, thereby changing 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 stably levitates.

[0105] Next, the process of eliminating the offset is 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 must be a difference in distance from the surrounding fourth magnetic devices 141. Therefore, at this time, the left and right third magnetic devices 141 are controlled to generate equal magnetic forces, so that the resultant force exerted 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.

[0106] It should be noted that the above-mentioned implementation mode is only used to illustrate the principle of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principle of the present invention, those skilled in the art can adjust the above-mentioned structure so that the present invention can be applied to more specific application scenarios.

[0107] Those skilled in the art can understand that the magnetic suspension balance 1 also includes some other well-known structures, such as a processor, a controller, a memory, etc., wherein the memory includes but is not limited to a random access memory, a flash memory, a read-only memory, a programmable read-only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes but is not limited to a CPLD / FPGA, a DSP, an ARM processor, a MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0108] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A magnetic suspension balance (1), characterized in that: The magnetic suspension balance (1) comprises: A main body module, wherein a sample chamber (113) is formed inside the main body module; A magnetic suspension weighing module, the magnetic suspension weighing module comprising an analytical balance (131) and a first magnetic device (132) arranged outside the sample chamber (113), and a second magnetic device (133) and a weighing component (134) arranged inside the sample chamber (113), the first magnetic device (132) being connected to the analytical balance (131), the second magnetic device (133) being connected to the weighing component (134), the weighing component (134) being used to hold a sample, the first magnetic device (132) being able to use magnetic force to suck up the second magnetic device (133), the weighing component (134) and the sample and weigh them through the analytical balance (131); A stabilization module, the stabilization module comprising a third magnetic device (141) arranged outside the sample chamber (113) and a fourth magnetic device (142) arranged inside the sample chamber (113), the fourth magnetic device (142) being connected to the second magnetic device (133) and being able to drive the second magnetic device (133) and the weighing component (134) to move so as to be centered and not rotate under the magnetic force of the third magnetic device (141).

2. The magnetic suspension 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 arranged 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 arranged on 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 a controller of the magnetic suspension balance (1).

3. The magnetic suspension balance (1) according to claim 2, characterized in that: The number of the third magnetic devices (141) is one, or the number of the third magnetic devices (141) is an odd number greater than one and is centrally symmetrically distributed about the fourth magnetic device (142), or the number of the third magnetic devices (141) is an even number and is symmetrically distributed about the fourth magnetic device (142).

4. The magnetic suspension balance (1) according to claim 3, characterized in that: The weighing component (134) comprises 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 second magnetic device (133) and the first end of the second connecting rod (1342), the second end of the second connecting rod (1342) is provided with a first lifting block (13421), and the fourth magnetic device (142) is installed on the second connecting rod (1342); The weighing component (134) also 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 samples. 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). A protective frame (114) is provided on the main body module. The first support frame (1344) is installed on the protective frame (114). The first lifting block (13421) can be driven by the second magnetic device (133) to move in the coupling frame (1343) for a distance and then abut against the coupling frame (1343), thereby driving the coupling frame (1343) and the first crucible (1345) to move to a suspended state separated from the first support frame (1344).

5. The magnetic suspension balance (1) according to claim 4, characterized in that: The weighing component (134) also includes a second support frame (1347) and a sinker / second crucible (1348), the second support frame (1347) is installed on the protection frame (114), and a second lifting block (13471) is fixedly arranged on the third connecting rod (1346), the sinker / second crucible (1348) is placed on the second support frame (1347) and slidably mounted on the third connecting rod (1346), the sinker / second crucible (1348) is located above the second lifting block (13471), and the second lifting block (13471) can be driven by the coupling frame (1343) to move in the air for a certain distance and then abut against the sinker / second crucible (1348), thereby driving the sinker / second crucible (1348) to move to a suspended state separated from the second support frame (1347).

6. The magnetic suspension 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), driving the coupling frame (1343), the first crucible (1345), the second lifting block (13471) and the sedimentation plate / second crucible (1348) to descend, and finally making the sedimentation plate / second crucible (1348) land on the second support frame (1347), and making the coupling frame (1343) land on the first support frame (1344).

7. The magnetic suspension balance (1) according to claim 4, 5 or 6, characterized in that: The magnetic suspension weighing module also includes a position sensor (135) arranged outside the sample chamber (113) and a position sensor (136) arranged inside the sample chamber (113); the position sensor (136) is installed on the second connecting rod (1342); the position sensor (135) is arranged on the side of the position sensor (136); the position sensor (135) can obtain 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 suspension balance (1).

8. The magnetic suspension balance (1) according to claim 7, characterized in that: The main body module comprises a first pressure-resistant shell (111) and a second pressure-resistant shell (112), wherein the second pressure-resistant shell (112) is detachably mounted below the first pressure-resistant shell (111), and the magnetic suspension balance (1) further comprises a temperature control module, wherein the temperature control module comprises a constant temperature jacket (121) sleeved on the outer side of the first pressure-resistant shell (111) and a high temperature jacket or an electric heating jacket (122) sleeved on the outer side of the second pressure-resistant shell (112), and the third magnetic device (141) and / or the position sensor (135) are mounted on the constant temperature jacket (121).

9. The magnetic suspension balance (1) according to claim 8, characterized in that: The first pressure shell (111) is provided with an air inlet (1111), the second pressure shell (112) is provided with an air outlet (1121), the first pressure shell (111) and the second pressure 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, and the first pressure shell (111) is detachably mounted with the second pressure 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 material.

10. The magnetic suspension 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 second connecting rod (1342) is correspondingly provided with a threaded hole / thread, and the first connecting rod (1341) and the second connecting rod (1342) are detachably connected via the thread / threaded hole; And / or, the first lifting block (13421) and / or the second lifting block (13471) are conical; And / or, the upper surface and the lower surface of the coupling frame (1343) are in the shape of a circular ring, 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 (1344) and the second support frame (1347) on the protection frame (114) are adjustable.

11. A control method for a magnetic suspension balance (1), characterized in that: The magnetic suspension balance (1) is the magnetic suspension balance (1) as claimed in claim 5, and the control method comprises: Controlling the first magnetic device (132) to adjust to the ZP gear position for zeroing; 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 ; Control the first magnetic device (132) to adjust to the MP2 gear position and control the analytical balance (131) to obtain the weight M of the second crucible c2 ; 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 ; Control the first magnetic device (132) to adjust to the MP2 gear position and control the analytical balance (131) to obtain the weight M of the sample in the second crucible s2 .

12. The control method for a magnetic suspension balance (1) according to claim 11, characterized in that: The step of "controlling the first magnetic device (132) to adjust to the ZP gear position for zeroing" further includes: The first magnetic device (132) is controlled to be energized and generate a first magnetic force, so that the first lifting block (13421) is moved to a suspended state in the coupling frame (1343) driven by the second magnetic device (133), the reading of the analytical balance (131) is read out, and the magnetic suspension balance (1) is controlled to be reset.

13. The control method for a magnetic suspension balance (1) according to claim 11, characterized in that: Step "controlling the first magnetic device (132) to adjust to the MP1 position and controlling the analytical balance (131) to obtain the weight M of the first crucible (1345) c1 "Further includes: The first magnetic device (132) is controlled to be powered on and generate a second magnetic force, and the first lifting block (13421) is driven by the second magnetic device (133) to move a certain distance in the coupling frame (1343) 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, and then the analytical balance (131) is controlled to read and obtain the weight M of the first crucible (1345). c1 .

14. The control method for a magnetic suspension balance (1) according to claim 13, characterized in that: Step "controlling the first magnetic device (132) to adjust to the MP2 position and controlling the analytical balance (131) to obtain the weight M of the second crucible c2 "Further includes: The first magnetic device (132) is controlled to be powered on and generate a third magnetic force, and the first lifting block (13421) is driven by the second magnetic device (133) to move a certain distance in the coupling frame (1343) and then abut against the coupling frame (1343), thereby driving the coupling frame (1343), the first crucible (1345) and the second crucible to move to a suspended state, and then the analytical balance (131) is controlled to read and obtain the total weight M of the first crucible (1345) and the second crucible. c , based on formula M c2 =M c -M c1 Get the weight M of the second crucible c2 .

15. The control method for a magnetic suspension balance (1) according to claim 14, characterized in that: Step "controlling the first magnetic device (132) to adjust to the MP1 position and controlling 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 controlled to be powered on and generate a fourth magnetic force, and the first lifting block (13421) is driven by the second magnetic device (133) to move a certain distance in the coupling frame (1343) and then abut against the coupling frame (1343), thereby driving the coupling frame (1343), the first crucible (1345) and the sample in the first crucible (1345) to move to a suspended state, and then the analytical balance (131) is controlled to read and obtain the total weight M of the first crucible (1345) and the sample in 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 .

16. The control method for a magnetic suspension balance (1) according to claim 15, characterized in that: Step "controlling the first magnetic device (132) to adjust to the MP2 position and controlling 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 controlled to be powered on and generate a fifth magnetic force, and the first lifting block (13421) is driven by the second magnetic device (133) to move a certain distance in the coupling frame (1343) and then abut against the coupling frame (1343), and drives 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, and then the analytical balance (131) is controlled to read and obtain 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 c5 , based on formula M s2 =M c5 -M c3 -M c2 Get the sample weight M in the second crucible s2 .

17. The control method for a magnetic suspension balance (1) according to claim 11, characterized in that: The magnetic suspension weighing module further comprises a position sensor (135) arranged outside the sample chamber (113) and a position sensor (136) arranged inside the sample chamber (113); the position sensor (136) is mounted on the second connecting rod (1342); the position sensor (135) is arranged on the side of the position sensor (136); the position sensor (135) can obtain 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 a controller of the magnetic suspension balance (1); and the control method further comprises: Controlling the position sensor (135) to obtain position information of the weighing component (134) and / or the sample; Comparing the size of the position information of the weighing component (134) and / or the sample with the preset position information; Controlling the first magnetic device (132) to adjust the magnitude of the generated magnetic force based on the comparison result; If the position information of the weighing component (134) and / or the sample is greater than the preset position information, controlling the magnetic force generated by the first magnetic device (132) to decrease; If the position information of the weighing component (134) and / or the sample is less than the preset position information, controlling the magnetic force generated by the first magnetic device (132) to increase; 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) is controlled to remain unchanged.

18. The control method for a magnetic suspension balance (1) according to claim 11, characterized in that: The number of the third magnetic devices (141) is an odd number and they are centrally symmetrically distributed with respect to the fourth magnetic device (142); or the number of the third magnetic devices (141) is an even number and they are symmetrically distributed with respect to the fourth magnetic device (142), and the control method further comprises: Obtaining 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) is controlled based on the induced electromotive force of the third magnetic device (141).

19. The control method for a magnetic suspension balance (1) according to claim 18, characterized in that: The step of "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 magnetic forces generated by the third magnetic device (141) are controlled to be equal in magnitude.

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

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