CN209745473U - gravity center position measuring device - Google Patents
gravity center position measuring device Download PDFInfo
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- CN209745473U CN209745473U CN201920326212.7U CN201920326212U CN209745473U CN 209745473 U CN209745473 U CN 209745473U CN 201920326212 U CN201920326212 U CN 201920326212U CN 209745473 U CN209745473 U CN 209745473U
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Abstract
The application provides a gravity center position measuring device which comprises a support, a swing frame assembly and a balance weight, wherein the swing frame assembly and the balance weight are fixedly installed on the support, the swing frame assembly comprises a rotating shaft, a guide rail assembly fixedly connected with one end of the rotating shaft and a workpiece connecting disc fixedly installed with the other end of the rotating shaft, and the guide rail assembly comprises a horizontal lead screw guide rail and a vertical lead screw guide rail which are T-shaped and are arranged vertically to each other; the balance weight comprises a horizontal balance weight and a vertical balance weight which can respectively move along the horizontal lead screw guide rail and the vertical lead screw guide rail. Through the gravity center position measuring device provided by the application, the gravity center coordinate of a large workpiece can be accurately measured, the gravity moment of the workpiece caused by gravity center deviation can also be accurately measured, and the gravity center position measuring device is applied to a single-blade static balance process of a large wind wheel.
Description
Technical Field
The utility model relates to a focus survey technical field especially relates to a focus position survey device.
Background
For some equipment or workpieces, the gravity center position needs to be determined in the use or processing process, two methods can be used at present, firstly, the method is determined through CAD software, the method is generally used in the workpiece design stage, the theoretical gravity center position can be determined before a real sample does not exist, but the real gravity center coordinate and the theoretical gravity center coordinate deviate due to the fact that shape and size errors and material uniformity degrees exist in the real object manufacturing process. The other scheme is that after a sample of a real object is obtained, the sample is actually measured, for example, the gravity center position is measured by a suspension method, the scheme is only suitable for workpieces with small sizes, large errors exist in the actual operation process, and the method is inconvenient for finding the gravity center of large objects.
the rotor balancing process is an indispensable process in the manufacturing process of a rotary machine, and has enough precision for a rotor with thinner axial thickness and slower rotating speed by adopting single-side static balance. At present, the gravity method is the most common static balance method for judging the gravity center position of an impeller, wherein one mode is to adopt a static balance support, two parallel horizontal guide rails are fixed on the support, a workpiece (the impeller or other rotors) is strung with a mandrel and then is placed on the workpiece, if the impeller has unbalance, the impeller rotates, and the gravity center points downwards. The device has the advantages of simple structure, convenient operation, low investment cost and the like, and has the defect of being only suitable for the balance of a small rotor. For the impeller with larger diameter, most manufacturers adopt a weight matching method, namely, each blade is weighed, the blades with the same or similar weight are arranged at the symmetrical positions, the method has certain effect on the rotor with uniform material and small blade forming error, but for the blades formed by hand pasting, such as glass fiber reinforced plastic blades or drawn aluminum profile blades, the method has poor effect, the gravity center position of the blades can not be strictly controlled in the forming process, although the blades are matched by weight, the unbalance of the impeller can not be controlled because the gravity center position error of the blades is larger.
At present, manufacturers also adopt a torque pairing method to control the unbalance, namely, a torque weighing device is adopted to measure the gravity torque of each blade, so that the blades with the same or similar torque are arranged at symmetrical positions. The most significant cause of this error is the misalignment of the blade shanks, and for longer blades, a slight misalignment of the shank mounting surface can cause a large change in the position of the blade center of gravity.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a survey device of article barycentric position, the barycentric coordinate of specially adapted survey large-scale article.
In order to achieve the above object, the present invention provides a gravity center position measuring device, which comprises a support, a swing frame assembly and a balance weight, wherein the swing frame assembly is fixedly installed on the support, the swing frame assembly comprises a rotating shaft, a guide rail assembly fixedly connected with one end of the rotating shaft, and a workpiece connecting disc fixedly installed with the other end of the rotating shaft, and the guide rail assembly comprises a horizontal lead screw guide rail and a vertical lead screw guide rail which are arranged in a T shape and are perpendicular to each other;
The balance weight comprises a horizontal balance weight and a vertical balance weight which can move along the horizontal lead screw guide rail and the vertical lead screw guide rail respectively.
In one embodiment, the swing frame assembly further comprises a level gauge fixedly mounted on the horizontal lead screw guide rail. The levelers are installed to detect the levelness of the horizontal lead screw guide rail.
in one embodiment, the horizontal balance weight and the vertical balance weight are both of a combined structure. By arranging the combined structure, the mass of the balance weight can be changed according to workpieces to be measured with different masses and shapes.
in one embodiment, the swing frame assembly further comprises a limiting block, and the limiting block is fixedly arranged at one end of the rotating shaft close to the guide rail assembly, so that the rotating shaft is limited when the rotating shaft rotates.
In one embodiment, the bottom of the limiting block and the surface of the bracket are arranged with a distance to limit the rotating angle of the rotating shaft. The rotating shaft can only rotate in a certain range, and the rotating range is determined by the distance between the limiting block and the support.
In one embodiment, the rotating shaft is fixedly mounted on the bracket through a bearing and a bearing seat, and the axial length of the rotating shaft is greater than the length of the bracket along the axial direction of the rotating shaft. So that the shaft heads at the two ends of the rotating shaft can extend out of the two side surfaces of the bracket, and the rotating shaft is convenient to be installed and matched with other components.
In one embodiment, the movement of the horizontal balance weight and the movement of the vertical balance weight are respectively driven by a motor mounted on the horizontal lead screw guide rail and a motor mounted on the vertical lead screw guide rail.
Through the gravity center measuring device provided by the application, the gravity center coordinate of a large workpiece can be accurately measured, the gravity moment of the workpiece caused by gravity center deviation can also be accurately measured, and the gravity center measuring device is applied to a single-blade static balance process of a large wind wheel.
drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
Fig. 1 is a view showing an overall appearance of a gravity center measuring apparatus according to an embodiment of the present invention;
fig. 2 is a front view of a gravity center determining apparatus according to an embodiment of the present invention;
Fig. 3 is an exploded view of a right side view of a gravity center determining apparatus according to an embodiment of the present invention;
Fig. 4 is a rear view of a gravity center determining apparatus according to an embodiment of the present invention;
Fig. 5 is an overall detection flowchart of the gravity center determining apparatus according to the embodiment of the present invention;
fig. 6 is a flowchart of an initialization operation of the gravity center determining apparatus according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a simulation calculation of the gravity center determining apparatus according to the embodiment of the present invention in an initial state;
Fig. 8 is a schematic diagram of a simulation calculation of the gravity center measuring apparatus according to the embodiment of the present invention when the pendulum frame rotates.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is the overall appearance diagram of the gravity center measuring device of the present invention, the measurement and control system is equipped in the overall machine 1, and the measurement and control system includes a computer 80, a programmable controller, etc. The computer 80 controls the operation of the motor in the gravity center measuring device according to the present invention through the programmable controller, and can monitor the displacement of the horizontal balance weight 202 and the vertical balance weight 302 as shown in fig. 1 and fig. 2, and the levelness of the level gauge 70. The utility model discloses in, the motor that adopts is servo motor.
in the whole machine, as shown in fig. 2 to 4, the gravity center measuring device of the present invention includes a support 10, a swing frame assembly fixedly mounted on the support, and a balance weight. The swing frame assembly comprises a rotating shaft 40 and a guide rail assembly fixedly connected with one end of the rotating shaft, the guide rail assembly comprises a horizontal lead screw guide rail 20 and a vertical lead screw guide rail 30 which are arranged in a T shape and are perpendicular to each other, and a workpiece connecting disc 50 is fixedly installed at the other end of the rotating shaft 40.
The horizontal lead screw guide rail 20 is provided with a lead screw 203 and a servo motor 201, the horizontal balance weight 202 is sleeved on the lead screw 203 in series, the servo motor 201 is arranged at one end of the horizontal lead screw guide rail 20, the lead screw 203 rotates under the driving of the servo motor 201, and the horizontal balance weight 202 can move along the horizontal lead screw guide rail 20.
Similarly, a lead screw 303 and a servo motor 301 are mounted on the vertical lead screw guide rail 30, the vertical balance weight 302 is serially sleeved on the lead screw 303, the servo motor 301 is arranged at one end of the vertical lead screw guide rail 30, the lead screw 303 rotates under the driving of the servo motor 301, and the vertical balance weight 302 can move along the vertical lead screw guide rail 30. The servo motor 201 and the servo motor 301 can be arranged at other positions of the horizontal lead screw guide rail 20 and the vertical lead screw guide rail 30 according to the requirements of the device of the application.
The swing frame assembly further comprises a level gauge 70, the level gauge 70 is fixedly installed on the horizontal lead screw guide rail 20, and the level gauge 70 can be fixed at the bottom of the horizontal lead screw guide rail 20 or embedded into the horizontal lead screw guide rail 20 for judging the levelness of the horizontal lead screw guide rail 20. The level 70 may be an electronic level.
the horizontal balance weight 202 and the vertical balance weight 302 are designed into a combined structure, and the mass of the balance weight can be changed through different component combinations so as to deal with workpieces with different masses and shapes.
A rotating shaft 40 is fixed above the support 10 through a high-precision bearing 401 and a bearing seat 402, and in the axial length direction of the rotating shaft 40, the axial length of the rotating shaft 40 is greater than the length of the support 10 in the axial direction of the rotating shaft, so that shaft heads at two ends of the rotating shaft 40 can extend out of two side faces of the support 10, and the rotating shaft is convenient to be installed and matched with other components. Horizontal lead screw guide rail 20 and perpendicular lead screw guide rail 30 are installed to the one end spindle nose of pivot 40, for fixed connection between horizontal lead screw guide rail 20 and perpendicular lead screw guide rail 30 and the pivot 40 to mutually perpendicular state is guaranteed to two guide rails.
The swing frame assembly further comprises a limiting block 60, the limiting block 60 is fixedly arranged at one end of the rotating shaft 40 close to the guide rail assembly, namely, the limiting block 60 is fixedly arranged at one side of the rotating shaft 40 close to the horizontal lead screw guide rail 20 and the vertical lead screw guide rail 30, so that the rotating shaft 40 is limited when the rotating shaft 40 rotates. The bottom of the limiting block 60 is spaced from the surface of the support 10, and the rotating angle of the rotating shaft 40 is ensured through the arrangement of the mode, the rotating shaft 40 can only rotate in a certain range, and the rotating range is determined by the distance between the limiting block 60 and the support 10.
the swing frame assembly further comprises a workpiece connecting disc 50, and the workpiece connecting disc 50 is fixedly arranged at the other shaft end of the rotating shaft 40 and used for connecting a workpiece to be measured.
To sum up, the utility model discloses an in the device, horizontal lead screw guide rail 20, perpendicular lead screw guide rail 30, stopper 60, pivot 40 and workpiece connection pad 50 have constituteed that a certain extent of rotation can take place the rocker subassembly wholly.
the method for determining the center of gravity of the workpiece to be detected by adopting the device and the equipment initialization steps are shown in fig. 5 and fig. 6, the basic detection flow steps are shown in fig. 5, the device is started up firstly, the workpiece to be detected is installed, and the balance of the workpiece to be detected is adjusted until the end.
During operation, the method for determining the center of gravity of the workpiece by the center of gravity determining device comprises the following steps: step 1, adjusting a horizontal balance weight 202 on a horizontal lead screw guide rail 20 and a vertical balance weight 302 on a vertical lead screw guide rail 30 to enable the whole swing frame to be in a balance state; step 2, reading and recording the positions of the horizontal balance weight 202 and the vertical balance weight 302; step 3, mounting the workpiece to be tested on the workpiece connecting disc 50; step 4, adjusting the positions of the horizontal balance weight 202 and the vertical balance weight 302 again, and measuring signals of the level gauge 70 at the same time to enable the horizontal lead screw guide rail 20 to be in a horizontal state; step 5, after balancing, reading the positions of the horizontal balance weight 202 and the vertical balance weight 302 again, and calculating the displacement of the horizontal balance weight and the displacement of the vertical balance weight; and 6, calculating the two-dimensional barycentric coordinate of the workpiece to be measured according to the displacement of the horizontal balance weight 202 and the displacement of the vertical balance weight 302.
in the embodiment of the present application, the length direction of the horizontal screw guide 20 is set as the x-axis, and the length direction of the vertical screw guide 30 is set as the y-axis, and in the above steps, the two-dimensional barycentric coordinate on the plane formed by the x-axis and the y-axis can be obtained by measurement and calculation; if the center of gravity in the z-axis direction, which is the third direction on the two-dimensional plane formed by the horizontal screw guide 20 and the vertical screw guide 30, is to be measured, the above center of gravity determining method further includes step 7: the workpiece to be measured can be rotated by 90 degrees in the vertical plane where the axis of the rotating shaft is located by changing the installation position of the workpiece to be measured, the original z-axis direction is the y-axis direction, the measuring steps are repeated, the gravity center position in the third direction can be obtained, and the accurate gravity center three-dimensional coordinates can be obtained by stacking the gravity centers of the two planes.
In one embodiment, as shown in fig. 6, the initialization steps of the apparatus of the present application are as follows: adjusting the vertical balance weight 302 to the lowest position, adjusting the horizontal balance weight 202, adjusting the level meter 70 to the horizontal state, reading the position of the horizontal balance weight 202, adjusting the vertical balance weight 302 to the highest position, moving the horizontal balance weight 202, changing the inclination direction of the horizontal lead screw guide rail 20, reading the displacement value of the horizontal balance weight 202, adjusting the position of the horizontal balance weight 202, and repeating the previous operation until the operation is finished.
In one embodiment, the balance principle for determining the two-dimensional center of gravity by using the device is as follows:
Setting conditions: the mass of the swing frame (all parts except a horizontal balance weight and a vertical balance weight in the whole swing part when the workpiece to be detected is not installed) is M0; the horizontal eccentricity of the gravity center of the swing frame is X0; the eccentric distance of the gravity center of the swing frame in the vertical direction is Y0; the mass of the horizontal balance weight is mx; when the whole swing is in an initial balance state (balance when a workpiece to be measured is not installed), the initial displacement of the horizontal balance weight is x 0; after the workpiece to be measured is installed, the displacement of the horizontal balance weight is dx when the whole balance frame is in a balanced state; the mass of the vertical balance weight is my; the initial displacement of the vertical balance weight is y0 when the whole swing part is in an initial balance state (balance when the workpiece to be measured is not installed); after the workpiece to be measured is installed, when the whole balancing stand is in a balanced state, the displacement of the vertical balance weight is dy; the mass of the workpiece to be measured is M; the eccentric distance of the gravity center of the workpiece to be measured in the horizontal guide rail direction is ex, and the eccentric distance of the gravity center of the workpiece to be measured in the vertical guide rail direction is ey.
At initial equilibrium there are:
Horizontal direction M0 × 0 ═ mx × 0 (1)
perpendicular M0Y 0 my Y0 (2)
The workpiece to be measured has the following components in a balanced state:
Horizontal direction M0 × X0 ═ mx (X0+ dx) + M × ex
and (1) when compared: m x ex ═ mx dx
Perpendicular direction M0Y 0 my Y0+ dy) + M ey
And (2) when compared: m ═ my ═ dy
The sensing method for the coincidence of the gravity center and the axis of the rotating shaft in the horizontal direction is simple, the horizontal balance weight displacement is adjusted, the signal of the level meter is measured at the same time, and the coincidence of the center lines is determined when the level meter signal shows that the horizontal lead screw guide rail is in the horizontal state. And (3) calculating to obtain the gravity center offset of the workpiece to be measured in the horizontal direction by applying the formula.
however, the formula (4) is only a theoretical one, and in actual operation, the moment arm approaches zero near the equilibrium position, so that the calculation result of the formula (4) cannot be directly applied. In the vertical direction, two conditions exist, the gravity center of the whole swing part (comprising the swing frame, the two balance weights and the workpiece to be measured) is not on the horizontal plane of the axis of the rotating shaft, the vertical distance from the gravity center to the plane is h, and when the gravity center is below the axis of the rotating shaft, the displacement of the horizontal balance weight and the inclination degree of the level meter present a single-value function relationship. When the focus of whole goods of furniture for display rather than for use is located pivot horizontal plane top, and the horizontal direction is unstable slightly, and horizontal guide rail must be to a lateral tilt, along with inclination's increase, the gravity arm of whole goods of furniture for display rather than for use can increase, until swinging to maximum inclination (stopper contact support mesa). The gravity center of the whole swing part is corrected by the horizontal balance weight, so that the horizontal lead screw guide rail is not possible to be in a horizontal state, because the gravity center of the whole swing part has a vertical distance (h) from the rotating shaft, when the horizontal guide rail inclines (an inclination angle alpha), a gravity arm (h sin alpha) is required, and therefore the horizontal balance weight can be tilted up only by moving more than one time of displacement, and the horizontal lead screw guide rail is turned to be inclined reversely. The minimum displacement dx of the horizontal balance weight required by the inclination from one side to the other side and the gravity center deviation h in the vertical direction are bound to have a linear relation, and the gravity center deviation h in the vertical direction of the whole swing part is bound to the position of the vertical balance weight, and the relation can be obtained by derivation of a formula (4).
In actual operation, the mass of the horizontal balance weight, the mass of the vertical balance weight and the mass of the workpiece to be measured are known in advance, and the displacement of the two balance weights can also be fed back through the servo motor, so that the gravity center position of the workpiece to be measured can also be indirectly obtained.
In yet another embodiment, the two-dimensional barycentric coordinates are calculated as follows.
Description of the symbols:
(1) The mass of a swing frame assembly (all parts except a horizontal balance weight and a vertical balance weight in the whole swing part when a workpiece to be detected is not installed) is M0, the gravity center eccentricity of the swing frame assembly is rho 0, the gravity center direction angle is theta 0, the eccentricity X0 in the horizontal direction is rho 0cos theta 0, and the eccentricity in the vertical direction is Y0 is rho 0sin theta 0;
(2) The mass of the horizontal balance weight is mh; the displacement of the horizontal balance weight (the displacement parallel to the direction of the horizontal lead screw guide rail and irrelevant to whether the swing frame assembly inclines or not) in the initial balance state (without installing the workpiece to be measured) is xh0, and the displacement of the horizontal balance weight when the whole balance frame is in the balance state after installing the workpiece to be measured is xh;
(3) the mass of the vertical balance weight is mv, and the displacement of the vertical balance weight (namely the displacement parallel to the direction of the vertical lead screw guide rail and irrelevant to whether the swing frame assembly inclines or not) when the whole swing part is in an initial balance state (a workpiece to be measured is not installed) is yv 0; after the workpiece to be measured is installed, when the whole balancing stand is in a balanced state, the displacement generated by the vertical balance weight is yv;
(4) the mass of the workpiece to be measured is m; the eccentricity of the center of gravity of the workpiece to be measured is e, the direction angle is theta, the eccentricity of the workpiece to be measured in the horizontal direction is x, and the eccentricity of the workpiece to be measured in the vertical direction is y;
(5) As shown in fig. 7, the direction of the horizontal lead screw guide rail is set as the x-axis, the direction of the vertical lead screw guide rail is set as the y-axis, and the intersection point of the axis of the rotating shaft and the plane formed by the x-axis and the y-axis is set as the origin. And taking the intersection point O as an origin, wherein the vertical distance from the origin to the motion trail of the mass center of the horizontal balance weight is yh0, and the motion trail of the vertical balance weight is intersected with the axis of the rotating shaft at the origin O. The limit inclination angle when the swing frame assembly is unbalanced (at this time, the limit block contacts the table top of the bracket, as shown in fig. 8) is alpha;
(6) the limiting inclination angle of the gravity center of the horizontal balance weight is theta h, the distance from the gravity center of the horizontal balance weight to the origin is rho h, and the distance from the gravity center of the vertical balance weight to the origin is rho v.
When the workpiece to be measured is not installed, the following components are arranged in an initial balance state:
Mg*X＝mg*x＝0 (5)
After the workpiece to be measured is installed, the balance state is as follows:
Mg*X+mg*xh+mg*e cosθ＝0 (7)
(3) After- (1) and finishing: mh (xh-xh0) + m ecos θ 0
in actual operation, the sensing method for coincidence of the horizontal gravity center and the axis of the rotating shaft is simple, the vertical balance weight is adjusted to the lowest position, the gravity center of the whole swing part (comprising the swing frame, the two balance weights and the workpiece to be detected) is located below the horizontal plane of the axis of the rotating shaft, the signals of the level instrument are monitored by adjusting the displacement of the horizontal balance weight, and the coincidence of the center lines is determined when the signals of the level instrument show that the horizontal lead screw guide rail is in a horizontal state. And (8) calculating to obtain the gravity center offset of the workpiece to be measured in the horizontal direction.
The gravity center offset in the vertical direction is complex, the vertical balance weight needs to be adjusted to the highest position, the gravity center of the whole swing part (comprising the swing frame, two balance weights and the workpiece to be measured) is located above the horizontal plane where the axis of the rotating shaft is located, the horizontal lead screw guide rail cannot be adjusted to the horizontal state position under the circumstance, and the swing frame is necessarily in the state of the ultimate inclination angle, as shown in fig. 8, the forward and reverse inclination depends on the gravity center offset, if the horizontal balance weight is adjusted to move in the opposite direction of the inclination of the swing frame, the swing frame can deflect in the opposite direction when being adjusted to a certain position, and at the moment when the swing frame is overturned, the initial balance state without the workpiece to be measured is provided with:
M*ρcos(θ+α)+m*ρcosθ+m*ρvcosθ＝0 (9)
In the above formula
The cos (θ 0+ α) was developed and finished with:
The method comprises the following steps of (1) installing a workpiece to be detected in a balanced state:
M*ρcos(θ+α)+m*ρcosθ+m*ρcosθ+m*ecos(θ+α)＝0
(13)
The cos (θ + α) was developed and finished with:
Through the derivation of the measurement principle, the gravity center measuring device for measuring the gravity center can be used for accurately measuring the gravity center coordinate of a large workpiece, can also be used for accurately measuring the gravity moment of the workpiece caused by gravity center deviation, and is applied to the single-blade static balance process of a large wind wheel.
in the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. The gravity center position measuring device is characterized by comprising a support, a swing frame assembly and a balance weight, wherein the swing frame assembly is fixedly installed on the support and comprises a rotating shaft, a guide rail assembly fixedly connected with one end of the rotating shaft and a workpiece connecting disc fixedly installed at the other end of the rotating shaft, and the guide rail assembly comprises a T-shaped horizontal lead screw guide rail and a vertical lead screw guide rail which are arranged vertically to each other;
The balance weight comprises a horizontal balance weight and a vertical balance weight which can respectively move along the horizontal lead screw guide rail and the vertical lead screw guide rail.
2. The apparatus of claim 1, wherein the rocker assembly further comprises a level, the level being fixedly mounted on the horizontal lead screw guide.
3. The gravity center position measuring apparatus according to claim 1, wherein the horizontal balance weight and the vertical balance weight are both of a combined structure.
4. the apparatus for determining the position of the center of gravity of claim 1, wherein the rocker assembly further comprises a stopper fixedly disposed at an end of the shaft adjacent to the rail assembly so as to limit the shaft when the shaft rotates.
5. the apparatus for determining the position of the center of gravity of claim 4, wherein the bottom of the stopper is spaced from the surface of the bracket to define the angle of rotation of the shaft.
6. the apparatus for determining the position of the center of gravity of claim 1, wherein said rotary shaft is fixedly mounted on said support by a bearing and a bearing seat, and the axial length of said rotary shaft is longer than the axial length of said support in the axial direction of said rotary shaft.
7. The gravity center position measuring apparatus according to claim 1, wherein the movement of the horizontal balance weight and the movement of the vertical balance weight are driven by a motor mounted on the horizontal lead screw guide rail and a motor mounted on the vertical lead screw guide rail, respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736230A (en) * | 2020-06-16 | 2020-10-02 | 上海复合材料科技有限公司 | Gravity center adjusting and hanging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736230A (en) * | 2020-06-16 | 2020-10-02 | 上海复合材料科技有限公司 | Gravity center adjusting and hanging device |
| CN111736230B (en) * | 2020-06-16 | 2023-10-10 | 上海复合材料科技有限公司 | Gravity center adjusting suspension device |
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