CN107422453A - Lever torque compensation mechanism for large caliber reflecting mirror - Google Patents

Abstract

A lever-type torque compensation mechanism for large-aperture mirrors, which relates to the technical field of ground-based large-aperture telescope mirror installation, and solves the problem of eccentric moments and limited spatial dimensions caused by the lateral support of existing ground-based large-aperture telescopes not on the centroid plane of the main reflector. Problem, the present invention adopts the principle of leverage to provide axial output force on the outer circumference of the main reflector to realize the moment compensation of the main reflector; when the optical axis of the main reflector is vertical, there is no eccentric moment in the main reflector, and the weight at the input end is located in the center On the rotating shaft, the input force is provided by the self-balancing weight, and the output force is used to balance the gravity of the output end and the clamping block at the output end; when the optical axis is between the horizontal and vertical, the output force of the self-balancing weight balances the output end , The gravity of the clamping block at the output end, and the output force of the weight block at the input end are used to balance the eccentric force. The invention has simple and compact structure and is easy to assemble and adjust.

Description

Lever-type torque compensation mechanism for large-aperture mirrors

technical field

The invention relates to the technical field of installation of ground-based large-diameter telescope reflectors, in particular to a moment compensation mechanism applied to the case where the lateral support of the large-diameter reflector is not on the centroid plane.

Background technique

With the continuous increase of the aperture of the photoelectric ground-based telescope, the weight of the main reflector also increases, resulting in an increase in the weight and cost of the support system. Therefore, the general ground-based large-aperture telescope adopts the lightweight form of the main reflector to reduce the weight and cost of itself and the support system. However, the light weight of the main reflector will also make the structure of the mirror body complex and various in shape, which will increase the difficulty in the design of the side support system.

At present, the main methods of side support for the main reflector of large astronomical telescopes are: 1. When the space size allows, it can be supported at the center of the main reflector; 2. When the centroid of the main reflector is behind the main reflector and the space size allows, it can be supported at the center of the main reflector The back of the main reflector adopts three-point support, and the plane formed by the support points is the centroid surface of the main reflector; 3. When the space size permits, the support on the edge of the main reflector is added to the inner edge of the center hole of the main reflector, and each support point The resultant force of the side support passes through the centroid surface of the main reflector; 4. There are also side supports at multiple axial support points on the back of the main reflector, and the resultant force of each side support passes through the centroid surface of the main reflector; 5. When the side support surface When passing through the centroid of the main reflector, it can only be supported on the outer edge of the main reflector, and the resultant force of the support passes through the centroid surface of the main reflector.

For ground-based large-aperture telescopes, methods 1 and 2 cannot be used due to the large diameter of the main reflector; for some main reflectors whose side supports cannot pass through the centroid plane, method 3 is not applicable; for some lack of axial space Method 4 is not suitable for telescopes; in summary, method 5 is feasible for ground-based large-aperture telescopes. At this time, it is necessary to increase the axial component on the lateral support to balance the moment caused by the lateral support not on the centroid plane. The lever of the present invention The type torque compensation mechanism just solves this problem.

Contents of the invention

The invention solves the problem that the lateral support of the ground-based large-aperture telescope is not on the centroid surface of the main reflector, resulting in eccentric moment and limited space size, etc., and is used for a lever-type torque compensation mechanism of the large-aperture reflector.

The lever-type torque compensation mechanism for large-diameter reflectors uses the principle of leverage to provide axial output force on the outer circumference of the main reflector to realize the moment compensation of the main reflector; the lever-type moment compensation mechanism includes an input end weight, an input End screw, central rotating shaft, self-balancing weight, self-balancing screw, bearing block, output end clamping block, fixed support and output end; the input end weight is fixed on one end of the input end screw, and can be The length of the input screw can be adjusted by freely moving the position of the input weight on the screw; the other end of the input screw is connected to the central shaft; the self-balancing weight is fixed on one end of the self-balancing screw, and Adjust the length of the self-balancing screw by moving the position of the self-balancing weight arbitrarily through threads on the balancing screw; the other end of the self-balancing screw is connected to the central shaft; the central shaft passes through the center hole of the bearing block and passes through the bearing and the fixed support connection; the bearing block is fixed on the fixed support by screws; the output end clamping block is clamped at the end of the central shaft by screws; the output end is connected to the output end clamping block through a ball bearing; when the main reflector When the optical axis is horizontal, the center of gravity of the self-balancing weight is located on the central shaft, the input force is provided by the weight at the input end, and the axial force at the output end is used to balance the torque;

When the optical axis of the main reflector is vertical, there is no eccentric moment in the main reflector, the weight at the input end is located on the central rotating shaft, the input force is provided by the self-balancing weight, and the output force is used to balance the gravity of the output end and the clamping block at the output end ; When the optical axis is between the horizontal and the vertical, the output force of the self-balancing weight balances the gravity of the output end and the clamping block at the output end, and the output force of the weight block at the input end is used to balance the eccentric force.

Beneficial effects of the present invention: the compensation mechanism of the present invention, when the optical axis of the main reflector is horizontal, the center of gravity of the self-balancing weight is located on the central rotating shaft, so the input force is provided by the weight at the input end, and the axial force balance torque is output at the output end . When the optical axis of the main reflector is vertical, there is no eccentric moment in the main reflector, and the weight at the input end is located on the central shaft, so the input force is provided by the self-balancing weight, and the output force at this time is used to balance the output end and the output end clamp. The gravity of the holding block. When the optical axis is between the horizontal and vertical, the output force of the self-balancing weight balances the gravity of the output end and the clamping block at the output end, and the output force of the input end weight balances the eccentric force; it ensures that the ground-based large-aperture telescope is in different The lever-type torque compensation mechanism can compensate the eccentric moment caused by the fact that the lateral support is not on the centroid surface of the main reflector at any pitch angle, and when there is no eccentric moment, that is, the optical axis is vertical, the lever-type torque compensation mechanism has no output force; the structure Simple, compact and easy to assemble and adjust.

Description of drawings

Fig. 1 is the structural schematic diagram of the lever type moment compensating mechanism that is used for large-aperture reflector according to the present invention;

Fig. 2 is a schematic diagram of the connection structure between the input end weight and the input end screw rod in the lever type torque compensation mechanism for large-diameter reflectors according to the present invention;

Fig. 3 is a schematic diagram of the connection structure between the self-balancing weight and the self-balancing screw in the lever-type torque compensation mechanism for large-diameter mirrors according to the present invention;

Fig. 4 is a schematic diagram of the connection structure of the central shaft, the clamping block at the output end and the fixed support in the lever-type torque compensation mechanism for large-aperture mirrors according to the present invention.

In the figure: 1. Input end weight, 2. Input end screw, 3. Central shaft, 4. Self-balancing weight, 5. Self-balancing screw, 6. Bearing block, 7. Output clamping block, 8. Fixed support, 9, output end.

detailed description

Specific Embodiments 1. This embodiment is described in conjunction with FIGS. 1 to 4. The lever-type torque compensation mechanism used for large-diameter reflectors uses the principle of leverage to provide axial output force on the outer circumference of the main reflector, thereby realizing the main reflector. torque compensation. It consists of input weight 1, input screw 2, central shaft 3, self-balancing weight 4, self-balancing screw 5, bearing stopper 6, output clamping block 7, fixed support 8, and output 9; As shown in Fig. 2, there is a hex nut at the upper and lower ends of the input end weight 1, and the input end weight 1 is fixed on the input end screw rod 2, and the input end moment arm can be adjusted by moving the screw thread arbitrarily on the screw rod length; the input end screw 2 is connected with the central shaft 3 through a gasket and a nut; on the screw rod 5, and the length of the moment arm can be adjusted by any movement of the thread on the screw rod; the self-balancing screw rod 5 is connected with the central shaft 3 through a gasket and a nut; the central shaft 3 passes through the center hole of the bearing block The bearing is connected to the fixed support 8; the bearing block is fixed on the fixed support 8 by screws; as shown in Figure 4, the output end clamping block 7 is clamped at the end of the central shaft 3 by screws; The output end 9 is connected with the output end clamping block 7 through a ball bearing.

The working process of the lever-type torque balance mechanism described in this embodiment is: when the optical axis of the main reflector is horizontal, the center of gravity of the self-balancing weight is located on the central rotating shaft, so the input force is provided by the weight at the input end, and the axial force is output at the output end balance moment. When the optical axis of the main reflector is vertical, there is no eccentric moment in the main reflector, and the weight at the input end is located on the central shaft, so the input force is provided by the self-balancing weight, and the output force at this time is used to balance the output end and the output end clamp. The gravity of the holding block. When the optical axis is between the horizontal and the vertical, the output force of the self-balancing weight balances the gravity of the output end and the clamping block at the output end, and the output force of the weight block at the input end balances the eccentric force.

Claims (2)

1. for the lever torque compensation mechanism of large caliber reflecting mirror, it is characterized in that, using lever principle outside principal reflection mirror Circumference provides axial power output, realizes the torque compensation of principal reflection mirror；

The lever torque compensation mechanism includes input pouring weight (1), input screw rod (2), central rotating shaft (3), self-balancing Pouring weight (4), self-balancing screw rod (5), bearing catch (6), output end grip block (7), hold-down support (8) and output end (9)；

The input pouring weight (1) is fixed on one end of input screw rod (2), and can pass through on input screw rod (2) Screw thread arbitrarily moves the position of input pouring weight (1) to adjust input screw rod (2) length；

The other end of the input screw rod (2) is connected with central rotating shaft (3)；

The self-balancing pouring weight (4) is fixed on one end of self-balancing screw rod (5), and passes through screw thread on self-balancing screw rod (5) The position of any mobile self-balancing pouring weight (4) adjusts self-balancing screw rod (5) length；

The other end of the self-balancing screw rod (5) is connected with central rotating shaft (3)；The central rotating shaft (3) passes through bearing catch (6) Centre bore is connected by bearing with hold-down support (8)；

The bearing catch (6) are fixed by screws on hold-down support (8)；

The output end grip block (7) is by screws clamp in central rotating shaft (3) end；The output end (9) passes through ball bearing It is connected with output end grip block (7)；

When principal reflection mirror optical axis level, self-balancing pouring weight (4) center of gravity is located on central rotating shaft (3), is carried by input pouring weight (1) For input power, output end (9) output axial force is used for trimming moment；

When principal reflection mirror optical axis is vertical, eccentric moment is not present in principal reflection mirror, and input pouring weight (1) is located at central rotating shaft (3) On, input power is provided by self-balancing pouring weight (4), power output is used for balance output end (9), the gravity of output end grip block (7)；

When optical axis is when between horizontal and vertical, power output balance output end (9), the output end grip block of self-balancing pouring weight (4) (7) gravity, the power output of input pouring weight (1) are used to balance eccentric force.

2. the lever torque compensation mechanism according to claim 1 for large caliber reflecting mirror, it is characterised in that described Input screw rod (2) is connected by pad, nut and central rotating shaft (3).