Centrifuge tangential misalignment angle measuring device

Abstract

The present application relates to a kind of centrifuge tangential misalignment angle measuring device, which is mainly composed of horizontal wire passage block, plumb wire passage block, mass ball, horizontal wire, plumb wire, capacitance micrometer probe, oil hole screw, positioning block and positioning block fixing screw.The horizontal wire passage block and the plumb wire passage block are tightly connected into one by passage block connecting screw.The horizontal wire and the plumb wire are respectively welded on the two points on the surface of the mass ball, which are perpendicular to the radius normal.The capacitance micrometer probe is arranged on both sides of the mass ball.The device is installed on the load workbench of the working disc of the centrifuge, and the horizontal wire points to the direction of the spindle axis of the centrifuge.The tangential misalignment angle is calculated by measuring the change of the air gap between the capacitance micrometer probe and the mass ball, and the directional accuracy of the positioning reference groove is calibrated.The present application has the characteristics of simple structure, low cost and easy to use.

Description

Technical Field

[0001] This invention relates to a centrifuge tangential misalignment angle measuring device, specifically a calibration device for determining the tangential positioning reference of a centrifuge load. Background Technology

[0002] Centrifuges are crucial and essential equipment for testing and calibrating inertial devices such as precision accelerometers. When using a centrifuge to test and calibrate accelerometers, the inertial sensing axis of the accelerometer must be precisely aligned with the centrifuge spindle axis. Therefore, a radial and tangential positioning reference for the workpiece under test needs to be provided on the centrifuge's load table. The positioning accuracy of this reference directly affects the calibration accuracy of the workpiece's performance. The centrifuge's tangential misalignment angle is the basis for adjusting this positioning reference. When the centrifuge's tangential misalignment angle is zero, the positioning reference is in its optimal position. Therefore, measuring the centrifuge's tangential misalignment angle is of great significance for calibrating accelerometers using a centrifuge. Typically, only standard accelerometers with a higher accuracy class than the centrifuge can be used for initial calibration of the positioning reference, resulting in high costs. This invention can accurately measure the tangential misalignment angle caused by errors in the positioning reference, providing a technical basis for adjusting the positioning reference. Summary of the Invention

[0003] The purpose of this invention is to provide a device for measuring the tangential misalignment angle caused by the positioning reference error of the workpiece in a centrifuge. This invention achieves the measurement of the tangential misalignment angle by utilizing the principle that a horizontal pendulum sphere points towards the center of rotation of the centrifuge under the steady-state centrifugal force. This allows for the detection of the load tangential misalignment angle deviation during steady-state rotation of the centrifuge.

[0004] The present invention comprises a mass ball 7, a horizontal wire 9, a vertical wire 4, a horizontal wire end post 11, a vertical wire end post 3, a horizontal wire channel block 1, a vertical wire channel block 2, a capacitance micrometer probe adjustment screw 5, a capacitance micrometer probe 6, a horizontal wire fixing screw 10, a vertical wire fixing screw 13, a channel block connecting screw 15, an oil injection hole sealing screw 12, a positioning block 8, and a positioning block fixing screw 14. The plumb line 4 of the present invention provides gravitational balance for the mass ball 7, enabling it to be in a frictionless suspended working state. The horizontal wire channel block 1 and the plumb line channel block 2 are fastened together by the channel block connecting screw 15. A horizontal elongated hole and a vertical elongated hole are drilled in the horizontal wire channel block 1 and the plumb line channel block 2, which are perpendicular to each other. The horizontal elongated hole and the vertical elongated hole meet in the plumb line channel block 2. On the connecting surface of the horizontal wire channel block 1 and the plumb line channel block 2, a circular hole with a diameter larger than the diameter of the mass ball 7 is drilled coaxially with the horizontal elongated hole until the mass ball chamber is formed at the intersection of the horizontal elongated hole and the vertical elongated hole. Horizontal wire 9 and vertical wire 4 are welded to two points on the surface of mass ball 7 where the radius normals are perpendicular to each other. Mass ball 7 is placed in mass ball chamber. Horizontal wire 9 passes through the horizontal elongated hole of horizontal wire channel block 1, and its end passes through the center hole of horizontal wire end post 11. A flexible hinge structure is processed at the fastening end of horizontal wire channel block 1. Horizontal wire end post 11 is clamped with horizontal wire fixing screw 10. Vertical wire 4 passes through the vertical elongated hole of vertical wire channel block 2, and its end passes through the center hole of vertical wire end post. A flexible hinge structure is processed at the fastening end of vertical wire channel block 2. Vertical wire end post 3 is clamped with vertical wire fixing screw 13. By adjusting the positions of horizontal wire end post 11 and vertical wire end post 3, horizontal wire 9 and vertical wire 4 are made perpendicular to each other. Vertical wire (4) is used to balance the gravity of mass ball (7) so that it is suspended in balance in the ball chamber without generating friction or other disturbance forces. A through hole perpendicular to the plane containing the horizontal wire 9 and the vertical wire 4 is machined in the plumb line channel block 2. The axis of the through hole passes through the intersection of the horizontal wire 9 and the vertical wire 4. The through hole is threaded near the two sides of the plumb line channel block 2. Two capacitance micrometer probes 6 are respectively installed into the through hole from both sides. The capacitance micrometer probe adjusting screw 5 is adjusted so that the air gap between the capacitance micrometer probe 6 and the mass ball 7 is the same. A threaded hole and a horizontal elongated hole are drilled in the horizontal wire channel block 1. Damping insulating mineral oil is injected into the mass ball chamber through the threaded hole, and the oil injection hole sealing screw 12 is screwed in. In use, the two cylindrical positioning blocks 8 are installed into the positioning reference groove 19 on the surface of the centrifuge working plate 16 by the positioning block fixing screw 14. After the centrifuge reaches the steady-state rotation working state, the data of the capacitance micrometer probe 6 is read, and the tangential misalignment angle is calculated by data processing. The rotation axis position of the load mounting platform 17 is adjusted accordingly, and the locking device 18 is locked.

[0005] This invention has the following characteristics:

[0006] This invention utilizes the centrifugal force of the mass ball 7 passing through the centrifuge's rotation center for measurement. When the tangential misalignment angle is not zero, the mass ball 7 will have a slight displacement in the tangential direction of the centrifuge's rotation. The displacement is detected by a high-precision capacitive micrometer probe 6, and the magnitude of the tangential misalignment angle is calculated. The components of this invention are manufactured using common machining methods. In use, this invention is installed on the positioning reference groove 19 on the surface of the centrifuge's working disc 16. This invention features high measurement accuracy, simple manufacturing, and convenient use. Attached Figure Description

[0007] Figure 1 This is an overall structural outline drawing of the present invention. Figure 2 This is a three-dimensional sectional view of the present invention. Figure 3 This is the front view of the present invention. Figure 4 This is a top view of the present invention. Figure 5 This is the right view of the present invention. Figure 6 This is the left view of the present invention. Figure 7 This is an installation diagram of the present invention on the working surface of a disc centrifuge. Detailed Implementation

[0008] refer to Figures 1-7 The centrifuge tangential misalignment angle measuring device proposed in this invention will be described in detail.

[0009] Depend on Figure 1 As can be seen, the main body of this invention consists of a horizontal wire channel block 1 and a vertical wire channel block 2. The channel block connecting screws 15 fasten the horizontal wire channel block 1 and the vertical wire channel block 2 together, forming a T-shaped main structure. Its internal structure is shown in the reference diagram. Figure 2In the horizontal wire channel block 1 and the vertical wire channel block 2, mutually perpendicular horizontal and vertical elongated oval holes are drilled to provide channels for the horizontal wire 9 and the vertical wire 4, respectively. Their diameters are much larger than the diameters of the horizontal wire 9 and the vertical wire 4. The horizontal and vertical elongated oval holes intersect in the vertical wire channel block 2. On the connecting surface of the horizontal wire channel block 1 and the vertical wire channel block 2, a circular hole with a diameter larger than the diameter of the mass ball 7 is drilled coaxially with the horizontal elongated oval hole until the intersection of the horizontal and vertical elongated oval holes forms a mass ball chamber to hold the suspended mass ball 7 during operation. The horizontal wire 9 and the vertical wire 4 are respectively welded to two points on the surface of the mass ball 7 where their radii and normals are perpendicular to each other, and pass through the horizontal elongated oval holes in the horizontal wire channel block 1 and the vertical elongated oval holes in the vertical wire channel block 2, respectively. To ensure that the horizontal wire 9 and the vertical wire 4... 4. To achieve good fixing and adjustment effects, horizontal wire end post 11 and vertical wire end post 3 are used to adjust the positions of horizontal wire 9 and vertical wire 4. A circular hole that fits the horizontal wire 9 with a clearance is machined at the axial position of horizontal wire end post 11. Horizontal wire 9 is passed through this circular hole, and horizontal wire end post 11 is clamped at the end of horizontal wire channel block 1. Similarly, a circular hole that fits the vertical wire 4 with a clearance is machined at the axial position of vertical wire end post 3. Vertical wire 4 is passed through this circular hole, and vertical wire end post 3 is clamped at the end of vertical wire channel block 2. To ensure both clamping effect and minimize the impact of clamping deformation on the device accuracy, two narrow, deep grooves are symmetrically machined at the clamping points of horizontal wire channel block 1 and vertical wire channel block 2 using wire cutting technology. The bottom of the grooves is arc-shaped, and the flexible hinge structure formed by these grooves achieves clamping. (Refer to...) Figure 1 , 2 4, 5, 6; A through hole perpendicular to the plane containing the horizontal wire 9 and the vertical wire 4 is machined in the vertical wire channel block 2. The axis of the through hole passes through the intersection of the horizontal wire 9 and the vertical wire 4. The through hole is a threaded hole near the two sides of the vertical wire channel block 2. Two capacitance micrometer probes 6 are respectively inserted into the through hole from both sides. The capacitance micrometer probe adjusting screw 5 is screwed in and adjusted so that the air gap between the capacitance micrometer probe 6 and the mass ball 7 is the same. A threaded hole and a horizontal elongated hole are drilled in the horizontal wire channel block 1. An oil injection hole sealing screw 12 is screwed into the threaded hole. In use, the invention is installed on the positioning reference groove 19 on the surface of the centrifuge working plate 16 through the positioning block 8. Silicone oil is injected into the cavity formed by the horizontal wire channel block 1 and the vertical wire channel block 2 through the oil injection hole. Reference Figure 2 and Figure 3 A rectangular cross-section positioning reference groove 19 is machined on the bottom surface of the horizontal wire channel block 1. Two cylindrical positioning blocks 8 are installed into the positioning reference groove 19 by positioning block fixing screws 14.

[0010] Two capacitance micrometer probes 6 are symmetrically arranged in the horizontal direction of the mass ball 7. The misalignment angle measuring device is installed on the load mounting platform 17 of the centrifuge working tray 16, and the horizontal wire 9 is ensured to point to the centrifuge main shaft axis. When the centrifuge rotates at high speed and reaches the steady-state speed, the size of the tangential misalignment angle is determined by measuring the relative change of the air gap between the capacitance micrometer probe 6 and the mass ball 7.

[0011] The installation and usage method of this invention is as follows Figure 7 Two load mounting platforms 17 are symmetrically installed on the edge of the centrifuge working disc 16. The load mounting platforms 17 can rotate around their own axis. After reaching the designated position, the rotation position of the load mounting platforms 17 is fixed by the locking device 18. The platform surface of the load mounting platforms 17 has a positioning reference groove 19. In use, it is required that the axis of the positioning reference groove 19 intersects with the rotation axis of the centrifuge working disc 16, that is, it is required that the axis of the positioning reference groove 19 intersects with the axis of the centrifuge main shaft. Thus, the workpiece under test is positioned by the positioning reference groove 19 to ensure the tangential positioning accuracy of the load workpiece. The device of the present invention is installed on the load mounting platform 17 by the cooperation of the cylindrical positioning block 8 and the positioning reference groove 19. The output signal of the capacitance micrometer probe 6 is connected to the capacitance micrometer data processing interface. After the centrifuge working disc 16 rotates at high speed to a stable state, the rotation axis position of the load mounting platform 17 is adjusted by measuring the change in the air gap between the micrometer probe 6 and the mass ball 7 until the relative change in the air gap between the micrometer probe 6 and the mass ball 7 is zero. At this time, it indicates that the positioning reference groove 19 on the load mounting platform 17 intersects with the rotation axis of the centrifuge working disc 16, and the locking device 18 is locked.

[0012] The positioning reference of the centrifuge load mounting platform can be measured and calibrated using the present invention without the need for initial calibration using a high-precision accelerometer, thus enabling rapid adjustment of the positioning reference of the load mounting platform 17.

Claims

1. A centrifuge tangential misalignment angle measuring device, characterized in that: It consists of a mass ball (7), a horizontal wire (9), a vertical wire (4), a horizontal wire end post (11), a vertical wire end post (3), a capacitance micrometer probe (6), a capacitance micrometer probe adjustment screw (5), a horizontal wire channel block (1), a vertical wire channel block (2), a horizontal wire fixing screw (10), a vertical wire fixing screw (13), a channel block connecting screw (15), an oil injection hole screw (12), a positioning block (8), and a positioning block fixing screw (14). Among them, the horizontal wire channel block (1) and the vertical wire channel block (2) are fastened together by the channel block connecting screw (15) to form a whole. The horizontal wire channel block (1) and the vertical wire channel block (2) are respectively drilled with mutually perpendicular horizontal elongated holes and vertical elongated holes, which meet in the vertical wire channel block (2). On the connecting surface of the horizontal wire channel block (1) and the vertical wire channel block (2), a circular hole with a diameter larger than the diameter of the mass ball (7) is drilled coaxially with the horizontal elongated hole until the intersection of the horizontal elongated hole and the vertical elongated hole forms a mass ball chamber, which is used to place the suspended mass ball (7) during operation. The horizontal wire (9) and the vertical wire (4) are respectively welded to two points on the surface of the mass ball (7) where the radius normals are perpendicular to each other. The horizontal wire (9) passes through the horizontal elongated hole of the horizontal wire channel block (1), and its end passes through the center hole of the horizontal wire end post (11). The horizontal wire end post (11) is clamped at the fastening end of the horizontal wire channel block (1) with a horizontal wire fixing screw (10) to fix the horizontal wire (9). The vertical wire (4) passes through the vertical elongated hole of the vertical wire channel block (2), and its end passes through the center hole of the vertical wire end post. The vertical wire end post (3) is clamped at the fastening end of the vertical wire channel block (2) with a vertical wire fixing screw (13). Two narrow deep grooves are symmetrically machined at the clamping points of the horizontal wire channel block (1) and the vertical wire channel block (2) using wire cutting technology. The bottom of the groove is arc-shaped. The flexible hinge structure formed by this groove enables the clamping of the horizontal wire (9) and the vertical wire (4). A through hole perpendicular to the plane containing the horizontal wire (9) and the vertical wire (4) is machined in the vertical wire channel block (2). The axis of the through hole passes through the intersection of the horizontal wire (9) and the vertical wire (4). The through hole is threaded near the two sides of the vertical wire channel block (2). The capacitance micrometer probe (6) is inserted into the through hole from both sides. The capacitance micrometer probe adjusting screw (5) is screwed in. The capacitance micrometer probe adjusting screw (5) is adjusted so that the air gap between the two probes and the mass ball (7) is the same. A threaded hole is drilled on the horizontal wire channel block (1) and a horizontal elongated hole is connected. Damping insulating mineral oil is injected into the mass sphere chamber through the threaded hole, and the oil injection hole sealing screw (12) is screwed in. A rectangular cross-section positioning reference groove (19) is machined on the bottom surface of the horizontal wire channel block (1). The positioning block (8) is installed into the positioning reference groove (19) by the positioning block fixing screw (14).

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