CN215448311U - Zero balance device of hydraulic force standard machine - Google Patents
Zero balance device of hydraulic force standard machine Download PDFInfo
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- CN215448311U CN215448311U CN202120840030.9U CN202120840030U CN215448311U CN 215448311 U CN215448311 U CN 215448311U CN 202120840030 U CN202120840030 U CN 202120840030U CN 215448311 U CN215448311 U CN 215448311U
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Abstract
The application discloses hydraulic pressure type force standard machine balancing unit at zero point, the device includes: the device comprises a drawing assembly, a main oil cylinder for bearing a workpiece, a loading oil cylinder with a zero mark, and a weight and a liquid counterweight connected with the loading oil cylinder, wherein the main oil cylinder is communicated with the loading oil cylinder through an oil pipe; the extraction assembly is capable of extracting or discharging a counterweight liquid into the liquid counterweight so that a liquid level height within the load cylinder is maintained at the zero marker. The weight of the counterweight liquid can be adjusted, and the adjustment precision is more accurate, so that the problem that the counterweight precision is lower due to the use of a counterweight with fixed weight, the final balance is difficult to realize is avoided, and the measurement result of the hydraulic force standard machine is further improved.
Description
Technical Field
The application relates to a zero point balancing device of a hydraulic force standard machine, and belongs to the technical field of mechanical measurement.
Background
In recent years, weighing sensors and load sensors are widely applied in design departments, mechanical and electronic industries, metallurgy, national defense and building industries, various sensors are rapidly proved in production and use, and measurement departments are required to comprehensively and accurately detect the sensors and provide consistent and reliable in-operation indexes. Therefore, various types of force standard machines are built in China, and the force standard machines can be divided into a dead weight type, a lever type, a hydraulic type, a superposition type and the like according to structures.
The hydraulic force standard machine is a force standard machine which takes the gravity of a weight as a standard load, amplifies the standard load by a hydraulic system formed by combining two groups of oil cylinder piston systems in a certain proportion and applies the load to a detected force meter according to a preset sequence.
Before acting force is applied to a workpiece to which a load is applied, the hydraulic force standard machine is in a gravity equilibrium state according to the Pascal principle. Once the detected workpiece is replaced, gravity changes are caused, which results in the initial balance being broken. It is therefore necessary to re-balance the weights of the hydraulic force standard machine to restore the equilibrium state. However, in the prior art, only the weight is used for carrying out the counterweight again, not only the weights need to be added or reduced by a plurality of attempts, but also the weight of each weight is fixed and is difficult to be accurately adjusted to a balanced state, so that the detection range of the hydraulic force standard machine is limited, and the measurement result is inaccurate.
SUMMERY OF THE UTILITY MODEL
The application provides a hydraulic pressure type force standard machine zero point balancing unit to solve at least one technical problem among the above-mentioned technical problem.
The technical scheme adopted by the utility model is as follows:
the application provides a hydraulic pressure type force standard machine balancing unit at zero point, it includes: the device comprises a drawing assembly, a main oil cylinder for bearing a workpiece, a loading oil cylinder with a zero position mark, and a weight and a liquid counterweight connected with a loading oil cylinder assembly, wherein the main oil cylinder is communicated with the loading oil cylinder through an oil pipe; the extraction assembly is capable of extracting or discharging a counterweight liquid into the liquid counterweight so that a liquid level height within the load cylinder is maintained at the zero marker.
The hydraulic force standard machine zero balance device also has the following additional characteristics:
the device also comprises a zero position detection piece, and the zero position detection piece is used for detecting the liquid level height of the loading oil cylinder.
The apparatus also includes a liquid storage assembly for storing weighted liquid that drains into or out of the liquid weight.
The pumping assembly includes a bi-directional pump for pumping weighted liquid from the liquid storage assembly into the liquid weight or pumping weighted liquid from the liquid weight into the liquid storage assembly.
The extraction assembly further comprises a first transmission pipe and a second transmission pipe; one end of the first transmission pipe is arranged in the liquid counterweight part, and the other end of the first transmission pipe is connected with the bidirectional pump; one end of the second transmission pipe is arranged in the liquid storage component, and the other end of the second transmission pipe is connected with the bidirectional pump.
The first transmission pipe is provided with two fluid inlets and outlets, and the two fluid inlets and outlets are symmetrically arranged on two sides of the liquid counterweight part respectively.
The extraction assembly further comprises a damper disposed within the first transfer tube, and the damper has an inlet and an outlet respectively in communication with the first transfer tube such that the weight fluid passes through the damper.
The extraction assembly further comprises a motor for driving the bidirectional pump to extract the counterweight liquid.
The device also comprises a main control chip, wherein the main control chip is respectively connected with the motor and the zero position detection piece and is used for receiving a liquid level signal sent by the zero position detection piece; when the zero position detection piece detects that the loading oil cylinder is located at the zero position mark, the main control chip controls the motor to stop working; when the zero position detection piece detects that the loading oil cylinder is not located at the zero position mark, the main control chip controls the motor to work.
The counterweight liquid has multiple different densities, and when the main oil cylinder bears different workpieces, the liquid counterweight part can counterweight the device according to counterweight liquid with different densities.
Benefits that can be produced by the present application include, but are not limited to:
1. the application draws or discharges the counter weight liquid into the liquid counter weight through the draw-off assembly. Compared with a mode of balancing weight through the weight in the prior art, the weight of the liquid for balancing weight can be adjusted, the adjusting precision is more accurate, the problem that the final balance is difficult to realize due to the fact that the weight with fixed weight is used, and therefore the measuring result of the hydraulic force standard machine is improved. In addition, be suitable for among the prior art the weight and carry out the in-process of counter weight, constantly try in order to reach balanced state with the weight of selecting different weight, the counter weight process is comparatively troublesome. And through counter weight liquid counter weight then need not calculate the weight of the liquid of input, only need to counter weight liquid extract can, the counter weight process is simple and convenient.
2. As a preferred embodiment of the present application, by providing the liquid storage assembly, not only the counterweight liquid input into the liquid counterweight assembly can be prestored, but also the counterweight liquid extracted from the liquid counterweight can be stored. Thereby realizing the recycling of the counterweight liquid. In addition, the volume and the quantity of the liquid storage assemblies can be replaced according to the required weight liquid, so that the weight balancing process is more flexible.
3. As a preferred embodiment of the present application, the bidirectional pump in the pumping assembly may pump not only the weighted liquid from the weight to the liquid storage assembly, but also the weighted liquid in the liquid storage assembly to the liquid weight. Through two-way extraction liquid, the problem that the counterweight process is complicated because the weights are increased or deleted manually in the prior art is solved, and the counterweight process is simpler and more convenient. And only one bidirectional pump can be used for realizing bidirectional liquid pumping, so that the cost is saved.
4. As a preferred embodiment of the present application, the first transfer pipe is provided with two fluid inlets and outlets, and the two fluid inlets and outlets are respectively symmetrically arranged on both sides of the liquid balance weight. The liquid has certain pressure in the moment of flowing out at the transmission pipe, and only inputs liquid at one end of the liquid counterweight member, can cause the liquid counterweight member to rock, arouses the unbalance. The fluid inlets and outlets which are symmetrically arranged can ensure that the liquid balance weight part keeps stable when liquid is input into the liquid balance weight part, thereby ensuring that the balance process is stable.
5. As a preferred embodiment of the present application, the withdrawing assembly further comprises a damper disposed in the first transfer pipe, and the damper has an inlet and an outlet communicated with the first transfer pipe, respectively, so that the weight liquid passes through the damper. The setting of attenuator can make the liquid of inputing to the liquid weight piece all flow through the attenuator that sets up to impact force when reducing the liquid outflow transmission pipe makes the liquid of output more gentle, thereby is difficult for causing the liquid weight piece to rock, makes its counter weight process more steady.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic view of a zero point balancing device of a hydraulic force standard machine according to an embodiment of the present application.
Wherein the content of the first and second substances,
100 workpieces, 101 hosts, 102 master cylinders, 103 loading cylinders, 104 weights, 105 liquid balance weights, 106 balance weight liquid, 107 liquid storage components, 108 two-way pumps, 109 first transmission pipes, 110 second transmission pipes, 111 dampers, 112 oil pipes and 113 motors.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, the zero point balancing device of the hydraulic force standard machine comprises an extraction assembly, a main cylinder 102 for bearing a workpiece 100, a loading cylinder 103 with a zero point identifier, and a weight 104 and a liquid counterweight 105 connected with the loading cylinder 103, wherein the main cylinder 102 is communicated with the loading cylinder 103 through an oil pipe 112. The weight 104 is connected below the loading cylinder 103, the liquid weight member 105 is connected below the weight 104, and the liquid weight member 105 is in a suspended state.
Before the hydraulic force standard machine applies acting force to the workpiece 100 to which the load is applied, the zero point is in a gravity equilibrium state according to the pascal principle. The initial weight and cross-sectional area of the master cylinder 102 in the equilibrium state, and the initial weight and cross-sectional area of the load cylinder 103 can be determined with reference to the following equations:
wherein m is20Is the equivalent initial mass, m, of the master cylinder 10210Is the initial counterweight mass of the loading cylinder 103, g is the acceleration of gravity, A2Is the cross-sectional area of the master cylinder 102, A1Is the cross-sectional area of the load cylinder 103.
The upper part of the main oil cylinder 102 is used for placing different workpieces 100 to be tested, and when different workpieces 100 are replaced, the gravity borne by the main oil cylinder 102 changes. At this time, the liquid in the cylinder with higher pressure will flow into the cylinder with lower pressure through the oil pipe 112, and the hydraulic force standard machine will lose balance, because of this
This requires re-weighting to restore balance. The relationship between the weight force causing the change in the workpiece 100 and the weight force that the load cylinder 103 needs to add or subtract can be determined by the following formula:
wherein, Δ m20g is the change in gravity caused by the workpiece 100 to be inspected, Δ m10g is the weight to be weighted, A2Is the cross-sectional area of the master cylinder 102, A1Is the cross-sectional area of the load cylinder 103.
As a preferred embodiment of the present application, referring to fig. 1, the extraction assembly is capable of extracting or discharging weighted liquid 106 into the liquid weight 105. So that the liquid level in the loading cylinder 103 is maintained at the zero mark.
Further, by pumping or discharging the weight liquid 106 into the liquid weight member 105, the weight of the load cylinder 103 can be reduced or increased, so as to reduce or increase the gravity borne by the load cylinder 103, and the liquid level in the load cylinder 103 is restored to the zero mark. According to the embodiment of the application, the counterweight is carried out on the gravity borne by the loading oil cylinder 103 in a manner of using the counterweight liquid 106, the counterweight weight can be accurately adjusted, the error is reduced, and the counterweight result is more accurate.
As a preferred embodiment of the present application, referring to fig. 1, the device further includes a zero position detecting member (not shown) for detecting a liquid level height of the charging cylinder 103. The zero position detecting element in the embodiment of the present application is disposed around the load cylinder 103, for example, may be disposed on the left or right side of the load cylinder 103, or may be disposed in front of or behind the load cylinder 103.
As a preferred embodiment of the present application, referring to fig. 1, the apparatus further comprises a liquid storage assembly 107, the liquid storage assembly 107 being for storing the weight liquid 106 discharged into or out of the liquid weight 105.
It should be noted that the liquid storage assembly 107 is placed on the ground or on an object such as a shelf, and cannot be suspended. And the volume and number of liquid storage assemblies 107 are not limited. If the weight is of a lighter weight, less weight liquid 106 is used and a smaller volume liquid storage assembly 107 may be selected. If the weight is heavier and more weight liquid 106 is used, a larger volume liquid storage assembly 107 may be selected, and a plurality of liquid storage assemblies 107 may be selected to store weight liquid 106.
As a preferred embodiment of the present application, the extraction assembly includes a bi-directional pump 108. The bi-directional pump 108 is used to pump the weighted liquid 106 in the liquid storage assembly 107 into the liquid weight 105 or to pump the weighted liquid 106 in the liquid weight 105 into the liquid storage assembly 107.
As a preferred embodiment of the present application, the extraction assembly further comprises a first transfer tube 109 and a second transfer tube 110. One end of the first transfer pipe 109 is disposed in the fluid weight member 105, and the other end is connected to the bidirectional pump 108. The second transfer tube 110 is disposed in the fluid storage assembly 107 at one end and is connected to the bi-directional pump 108 at the other end.
Further, in the event that it is desired to discharge the weighted liquid 106 into the fluid weight 105, the bi-directional pump 108 is rotated to draw the liquid from the liquid storage assembly 107 through the second transfer tube 110 and deliver the weighted liquid 106 into the fluid weight 105 through the first transfer tube 109 to which the bi-directional pump 108 is connected. In the event that it is desired to remove the weighted liquid 106 from the fluidic weight 105, the bi-directional pump 108 is reversed, drawing the liquid from the fluidic weight 105 through the first transfer tube 109, and delivering the weighted liquid 106 to the liquid storage assembly 107 through the second transfer tube 110 to which the bi-directional pump 108 is connected. The arrangement of the bidirectional pump 108, the first transmission pipe 109 and the second transmission pipe 110 can automate the weighting process and simplify the weighting process.
As a preferred embodiment of the present application, the first transfer pipe 109 is provided with two fluid inlets and outlets, and the two fluid inlets and outlets are respectively symmetrically disposed at two sides of the liquid balance weight 105.
Further, the first transfer pipe 109 is formed in an "F" shape inclined 90 degrees clockwise, and two pipes of the liquid balance weight 105 are bent to be vertically placed in the liquid. The counterweight liquid 106 is transported in a transverse transport tube and is transported via two vertical pipes to the liquid counterweight 105.
By providing two vertical pipes as the fluid inlet and outlet, the embodiment of the present application can increase the speed of the fluid flowing into the liquid balance weight 105. On the other hand, because of the fluid can take pressure certainly in the moment of flowing out, consequently the symmetry sets up two access & exit and can make the pressure that liquid counterweight 105 both ends received the same to improve liquid counterweight 105's equilibrium, make the counter weight process more steady.
As a preferred embodiment of the present application, the extraction assembly further comprises a damper 111 disposed inside the first transfer pipe 109. And the damper 111 has an inlet and an outlet respectively communicating with the first transfer pipe 109 so that the weight liquid 106 passes through the damper 111.
Further, the two fluid inlets and outlets provided in the first transfer pipe 109 are respectively provided with dampers 111. The dampers 111 are disposed in two vertically disposed pipes of the first delivery pipe, and are disposed near the edges of the inlet and outlet. The ports of the damper 111 are in the same direction as the ports of the vertically disposed tubes so that fluid can flow through the ports of the damper 111 to the fluid weight 105.
The damper 111 is arranged in the embodiment of the liquid balance weight device, so that the liquid pressure to the liquid balance weight part 105 caused by the liquid flowing out at the moment can be reduced, and the shaking phenomenon generated after the liquid balance weight part 105 receives the fluid impact is relieved. The smoother the liquid weight member 105 is during the weight balancing process, the more accurate the weight balancing result is.
As a preferred embodiment of the present application, the pumping assembly further comprises a motor 113, wherein the motor 113 is used for driving the bidirectional pump 108 to pump the weighted liquid 106. The motor 113 is connected with the bidirectional pump 108, and the motor 113 drives the bidirectional pump to rotate forward or backward through forward and backward rotation, so that the liquid in the liquid counterweight 105 can be extracted or discharged.
As a preferred embodiment of the present application, the apparatus further includes a main control chip (not shown in the figure), the main control chip is respectively connected to the motor 113 and the zero position detecting element, and the main control chip is configured to receive the liquid level signal sent by the zero position detecting element. When the zero position detection piece detects that the loading oil cylinder 103 is located at the zero position mark, the main control chip controls the motor 113 to stop working. When the zero position detection piece detects that the loading oil cylinder 103 is not located at the zero position mark, the main control chip controls the motor 113 to work.
Further, the main control chip can receive a liquid level signal sent by the zero position detection element, the zero position detection element detects the liquid level of hydraulic oil in the loading oil cylinder 103 in real time, and transmits the detected liquid level height to the main control chip in real time. The main control chip can send different control commands to the motor 113 according to the received liquid level change condition.
For example, when the weight of the workpiece 100 on the master cylinder 102 becomes heavy, the weight applied to the master cylinder 102 becomes large, and the fluid in the master cylinder 102 flows to the load cylinder 103 through the oil pipe 112. When the liquid level of the loading oil cylinder 103 rises, the zero position detection piece monitors that the liquid level of the loading oil cylinder 103 is higher than the zero position mark, and the device is in an unbalanced state at the moment. The zero position detection piece transmits the liquid level height information to the main control chip, the main control chip receives the liquid level information, and the motor 113 is controlled to rotate forwards according to the information that the liquid level height is higher than the zero position mark, and the motor 113 drives the bidirectional pump 108 to rotate forwards. At this time, the bidirectional pump 108 inputs the counterweight liquid 106 in the liquid storage assembly 107 to the liquid counterweight 105, the gravity applied to the load cylinder 103 increases, the pressure in the load cylinder 103 increases, and the liquid is conveyed to the main cylinder 102 through the oil pipe 112, and the liquid level returns to the zero marker. When the zero position detection piece detects that the liquid level of the loading oil cylinder 103 is restored to the zero position mark, the liquid level height information is transmitted to the main control chip again, at the moment, the main control chip also retransmits a stop command to the motor 113, the motor 113 stops running, and the device restores to a balance state.
Similarly, if the gravity borne by the master cylinder 102 is reduced, the liquid level of the loading cylinder 103 will be reduced, and at this time, the main control chip controls the motor 113 to rotate reversely. The bi-directional pump 108 draws fluid from the fluid weight 105 and the fluid level in the load cylinder 103 rises to the null position display. The main control chip controls the motor 113 to stop working, and the device recovers the balance state.
It should be noted that the forward and reverse rotation directions of the motor 113 can be set according to the actual application requirements. The embodiments of the present application do not limit this.
As a preferred embodiment of the present application, the weight fluid 106 has a plurality of different densities, and the fluid weight member 105 is capable of weighting the device according to the different densities of the weight fluid 106 when the master cylinder 102 carries different workpieces 100.
It should be noted that the weight fluid 106 may be water having a density of 1g/cm3. The weight liquid 106 may also be gasoline having a density of 0.71g/cm3. The weight fluid 106 may also be alcohol having a density of 0.79g/cm3. According to the embodiment of the application, liquid with a proper density can be selected as the counterweight liquid 106 to perform counterweight according to the weight of the workpiece 100 carried by the main oil cylinder 102.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A hydraulic force gauge zero point balancing apparatus, comprising: the device comprises a drawing assembly, a main oil cylinder for bearing a workpiece, a loading oil cylinder with a zero mark, and a weight and a liquid counterweight connected with the loading oil cylinder, wherein the main oil cylinder is communicated with the loading oil cylinder through an oil pipe;
the extraction assembly is capable of extracting or discharging a counterweight liquid into the liquid counterweight so that a liquid level height within the load cylinder is maintained at the zero marker.
2. The zero balancing device of a hydraulic force standard machine according to claim 1, further comprising a zero position detector for detecting a liquid level height of the loading cylinder.
3. The hydraulic force standard machine zero balance device of claim 1, further comprising a fluid storage assembly for storing weight fluid discharged into or out of the fluid weight.
4. A hydraulic force standard machine zero balance device according to claim 3, wherein the draw assembly comprises a bi-directional pump for drawing the weight fluid from the fluid storage assembly into the fluid weight or drawing the weight fluid from the fluid weight into the fluid storage assembly.
5. The hydraulic force standard machine zero balance device of claim 4, wherein the extraction assembly further comprises a first transfer pipe and a second transfer pipe; one end of the first transmission pipe is arranged in the liquid counterweight part, and the other end of the first transmission pipe is connected with the bidirectional pump; one end of the second transmission pipe is arranged in the liquid storage component, and the other end of the second transmission pipe is connected with the bidirectional pump.
6. The zero balance device of a hydraulic force standard machine according to claim 5, wherein the first transmission pipe is provided with two fluid inlets and two fluid inlets are symmetrically arranged on two sides of the liquid balance weight respectively.
7. The hydraulic force standard machine zero balance device of claim 6, wherein the extraction assembly further comprises a damper disposed within the first transfer tube, and the damper has an inlet and an outlet in communication with the first transfer tube, respectively, such that the weight fluid passes through the damper.
8. The hydraulic force standard machine zero balance device of claim 4, wherein the extraction assembly further comprises a motor for driving the bi-directional pump to extract a counter weight liquid.
9. The zero balancing device of a hydraulic force standard machine according to claim 8, further comprising a main control chip, wherein the main control chip is connected to the motor and the zero position detector, respectively, and is configured to receive a liquid level signal sent by the zero position detector;
when the zero position detection piece detects that the loading oil cylinder is located at the zero position mark, the main control chip controls the motor to stop working;
when the zero position detection piece detects that the loading oil cylinder is not located at the zero position mark, the main control chip controls the motor to work.
10. The hydraulic force standard machine zero balance device of claim 1, wherein the counterweight fluid has a plurality of different densities, and the fluid counterweight member is capable of counterweight the device according to different densities of counterweight fluid when the master cylinder is carrying different workpieces.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993531A (en) * | 2022-05-09 | 2022-09-02 | 国科大杭州高等研究院 | Weak force measuring device and method based on closed-loop control of cold air thruster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993531A (en) * | 2022-05-09 | 2022-09-02 | 国科大杭州高等研究院 | Weak force measuring device and method based on closed-loop control of cold air thruster |
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