Combined type U-shaped frame structure with adjustable mass center

Abstract

The utility model belongs to the technical field of photoelectric rotary tables, and particularly relates to a mass center adjustable combined type U-shaped frame structure which comprises a side frame mechanism, a lower frame mechanism, a middle frame mechanism and a mass center adjusting assembly. The U-shaped frame structure comprises two groups of side frame mechanisms and a lower frame mechanism; lower frame mechanisms are fixedly connected to the two sides of the middle frame mechanism in an axial symmetry mode, a side frame mechanism is fixedly arranged on the upper portion of each lower frame mechanism, and then a U-shaped structural frame is formed. The mass center adjusting assembly is arranged in the lower frame mechanism and used for adjusting the mass center of the U-shaped frame structure, and stable control over the direction and the axial direction of the rotary table can be easily achieved. Compared with the prior art, parts of the combined U-shaped frame are low in machining difficulty, and material cost is saved. When the load size of the U-shaped frame is changed, only the side frames and the middle frame need to be correspondingly changed, other parts can be reused, the machining and reassembling time is shortened, and the structure mass center adjusting operation is convenient and fast.

Description

Technical Field

[0001] The utility model belongs to the technical field of optoelectronic turntables, and particularly relates to a centroid-adjustable combined U-shaped frame structure. Background Technique

[0002] The optoelectronic two-dimensional turntable is a high-precision motion platform integrating optics, mechanics, and electronic technologies, and is widely used in various fields such as industry, aerospace, and military. The optoelectronic turntable usually uses a U-shaped frame as the basic structure. The frame is simultaneously connected to the azimuth axis system and the pitch axis system of the turntable, and needs to have sufficient structural stiffness to ensure the structural stability in a complex environment; by equipping the turntable with motors, encoders, etc., high-precision rotation control and position feedback in two mutually perpendicular axial directions are realized.

[0003] At present, the U-shaped frame structure mostly uses numerical control machining technology to process the whole piece of material or the casting blank surrounding the envelope surface of the U-shaped frame. Applying the whole piece of material will lead to material waste and increased processing difficulty; applying the casting blank requires additional manufacturing of molds, which will cause an increase in the unit cost and an extension of the processing time under non-batch requirements of the U-shaped frame. And once the external dimensions of the turntable load component change, the original U-shaped frame cannot be reused and needs to be reprocessed. In addition, the current U-shaped frame structure cannot adjust the centroid. To reduce the disturbance of the inertial force caused by the eccentric mass to the turntable and achieve stable control of the azimuth axis of the turntable, it is usually necessary to fix the counterweight on the U-shaped frame structure by gluing or drilling holes; the determination of the counterweight position and the installation of the counterweight require high requirements for operators and are difficult to achieve rapid adjustment. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a centroid-adjustable combined U-shaped frame structure to solve the technical problems of high processing difficulty and high cost of the integrated U-shaped frame, the inability to reuse the U-shaped frame structure when the dimensions of the turntable load change, and the difficulty in adjusting the eccentric mass of the structure.

[0005] The technical solution to achieve the purpose of the utility model is: a centroid-adjustable combined U-shaped frame structure, characterized in that the U-shaped frame structure includes a side frame mechanism, a lower frame mechanism, a middle frame mechanism, and a centroid adjustment component; the U-shaped frame structure includes a group of side frame mechanisms and a lower frame mechanism; the two sides of the middle frame mechanism are symmetrically and fixedly connected to the lower frame mechanism, and a side frame mechanism is fixedly arranged on the upper part of each lower frame mechanism, thereby forming a U-shaped structure frame; the centroid adjustment component is arranged in the lower frame mechanism and is used to adjust the centroid to achieve stable control of the azimuth axis of the turntable.

[0006] Compared with the prior art, the utility model has the following remarkable advantages:

[0007] (1) The U-shaped frame adopts a modular combination method. The side frame, lower frame, and reinforcement frame are all common parts. Compared with the processing of an integrated U-shaped frame, the part processing difficulty of the combined U-shaped frame is lower, and the material cost is saved.

[0008] (2) When the load size of the U-shaped frame changes, only the side frame and the middle frame need to be correspondingly changed, and other parts can be reused, reducing the processing and reassembly time.

[0009] (3) The reinforcement frame can improve the local stiffness after the waist-shaped openings on both sides of the lower part of the side frame and the middle frame through the method of snap connection and screw fastening; after the lower frame is inserted and fitted with the side frame and the middle frame and fixed, the method of matching screw and nut fastening can improve the overall structural stiffness of the U-shaped frame.

[0010] (4) The operation of adjusting the structural centroid is convenient and fast. According to the actual offset of the overall centroid of the rotating component in the current orientation, the centroid adjustment component can be installed singly or in multiple in the two side cavities of the left and right lower frames of the U-shaped frame; being located at the distal position of the azimuth axis system is beneficial to the adjustment of the centroid of the azimuth rotating component; after determining the installation position of the centroid adjustment component, the centroid can be quickly adjusted by rotating the shaft sleeve, increasing or decreasing the counterweight screws, and rotating the counterweight disc.

[0011] (5) Sealing components are arranged on the frame mating surface and the cover plate mating surface, which can improve the sealing performance of the U-shaped frame cavity. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the structural composition of a centroid-adjustable combined U-shaped frame described in the present invention.

[0013] Figure 2 It is Figure 1 the A-A cross-sectional view in

[0014] Figure 3 It is a schematic diagram of the assembly of the side frame and the lower frame of the U-shaped frame structure of the present invention.

[0015] Figure 4 It is a schematic diagram of the assembly of the lower frame and the middle frame of the U-shaped frame structure of the present invention.

[0016] Figure 5 It is a schematic diagram of the assembly of the centroid adjustment component of the lower frame of the U-shaped frame structure of the present invention.

[0017] Figure 6 It is an exploded view of the U-shaped frame structure of the present invention. Detailed Embodiment

[0018] To better understand the solution of the present invention, the following will be combined with the attached Figures 1-6, the technical solution is clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments, and should not be construed as a limitation to the present utility model.

[0019] A centroid-adjustable combined U-shaped frame structure in this embodiment, as Figure 1 shown, includes: a side frame mechanism, a lower frame mechanism, a middle frame mechanism, and a centroid adjustment component;

[0020] The U-shaped frame structure includes two groups of side frame mechanisms and a lower frame mechanism; the two sides of the middle frame mechanism are axially symmetrically fixedly connected to the lower frame mechanism, and a side frame mechanism is fixedly arranged on the upper part of each lower frame mechanism. The side frame mechanism is used to install or carry devices such as motors, resolvers, boards, and filters of the turntable; the centroid adjustment component is arranged in the lower frame mechanism to adjust the centroid, reduce the disturbance of the inertial force caused by the eccentric mass to the turntable, and is beneficial to realizing the stable control of the azimuth axis of the turntable;

[0021] The side frame mechanism includes: side frame 1, reinforcement frame 4, and side cover 5;

[0022] The side frame 1 and the side cover 5 are fixedly connected by a slotted countersunk screw 16;

[0023] The lower part of the side frame 1 is provided with a waist-shaped hole. The reinforcement frame 4 is inserted into the waist-shaped hole at the lower part of the side frame 1 and is slidably clamped along the length direction of the waist-shaped hole to the position of the reinforcing rib arranged on the side of the side frame 1, and is fastened by a screw 17; the reinforcement frame 4 is used to improve the local connection stiffness between the side frame 1 and the lower frame 2.

[0024] The lower frame mechanism includes: lower frame 2, lower front cover 6, lower rear cover 7, and lower side cover 8;

[0025] The lower front cover 6, the lower rear cover 7, and the lower side cover 8 are fixedly connected to the lower frame 2 by slotted countersunk screws 16,

[0026] The upper part of the lower frame 2 is provided with a rectangular groove, and the frame sealing ring 14 is placed in the rectangular groove at the upper part of the lower frame 2 to improve the sealing performance between the side frame 1 and the lower frame 2;

[0027] After the reinforcement frame 4 is fixed to the side frame 1, they are inserted into the lower frame 2 together. The waist-shaped boss and groove provided at the upper part of the lower frame 2 are respectively inserted and matched with the waist-shaped hole at the lower part of the side frame 1 and the two side plates of the reinforcement frame; the side frame 1 and the lower frame 2 are locked by a screw 17 and a nut 18; as Figure 3 shown.

[0028] The lower frame 2 has 3 independent inner cavities, which is convenient for the locking operation of screws and nuts and the arrangement of devices and cables inside the U-shaped frame. C0.5 chamfers are provided at the plugging edges of the bosses and notches of the side frame 1, the lower frame 2, and the reinforcement frame 4.

[0029] The middle frame mechanism includes: a middle frame 3, a reinforcement frame 4, and a middle cover 9; the middle cover 9 is fixedly connected to the top surface of the middle frame 3 by a countersunk slotted screw 16.

[0030] The middle frame 3 is provided with kidney-shaped holes on both sides. The reinforcement frame 4 is inserted into the kidney-shaped holes on the side of the middle frame 3 and is slidably clamped along the length direction of the kidney-shaped holes to the position of the reinforcing ribs arranged at the bottom of the middle frame 3, and is fastened by screws 17.

[0031] The frame sealing ring 14 is placed in the rectangular groove on the side of the lower frame 2 to improve the sealing performance between the lower frame 2 and the middle frame 3; after the reinforcement frame 4 is fixed to the middle frame 3, they are inserted into the lower frame 2 together. The kidney-shaped bosses and grooves provided on the side of the lower frame 2 are respectively inserted and fitted with the kidney-shaped holes on the side of the middle frame 3 and the two side plates of the reinforcement frame; the middle frame 3 and the lower frame 2 are locked by screws 17 and nuts 18; as Figure 4 shown.

[0032] A C0.5 chamfer is provided at the plugging edge positions of the bosses and notches of the middle frame 3, the lower frame 2, and the reinforcement frame 4.

[0033] The centroid adjustment assembly is installed in the two side cavities of the left and right lower frames 2 of the U-shaped frame structure, located at the distal position of the azimuth axis of the U-shaped frame structure, which is beneficial to the adjustment of the centroid of the azimuth rotation assembly.

[0034] The centroid adjustment assembly includes: a shaft 19, a bushing 20, a counterweight disk 21, a positioning retaining ring 22, a set screw 23, a counterweight screw 24, a locking nut 25, and a countersunk slotted screw 16.

[0035] The shaft 19 includes a disk and a shaft column. Circular notches are symmetrically provided on the vertical plates of the two side cavities of the lower frame 2. After the disk at the end of the shaft 19 is fitted with the circular notch of the lower frame 2, it is fastened by a screw 16; an external thread is provided at the shaft column end of the shaft 19; an internal threaded hole is provided on the bushing 20, and a smooth shaft section and an external threaded shaft section are provided on the shaft section of the bushing 20; the shaft column end of the shaft 19 is fitted with the internal threaded hole of the bushing 20; the inner hole of the counterweight disk 21 is sleeved on the smooth shaft section of the bushing 20, and the external threaded shaft section of the bushing 20 is fitted with the internal threaded hole of the positioning retaining ring 22.

[0036] After the counterweight disc 21 is sleeved into the bushing 20, by rotating the bushing 20 through the process hole at the end of the bushing 20, the preliminary axial adjustment of the counterweight disc 21 can be realized; rotate the positioning retaining ring 22 to fit the counterweight disc 21, tighten the set screw 23 on the counterweight disc 21 to lock the counterweight disc 21. After the positioning retaining ring 22 rotates and fits the counterweight disc 21, by tightening the set screw 23, the axial pre-tightening force between the positioning retaining ring 22 and the bushing 20 can be increased to lock the counterweight disc 21; by means of the opening on the counterweight disc 21, rotate the bushing 20, the counterweight disc 21, the positioning retaining ring 22 and the set screw 23 as a whole, and synchronously rotate the lock nut 25 to fit the positioning retaining ring 22; after the final axial adjustment is completed, tighten the lock nut 25.

[0037] On the counterweight disc 21, there are symmetrically distributed threaded holes arranged radially along the circumference. By increasing or decreasing the number of counterweight screws 24, changing the position of the counterweight screws 24, and rotating the counterweight disc 21 after loosening the set screw 23, the centroid can be finely adjusted. After the centroid adjustment is completed, re-tighten the set screw 23 on the counterweight disc 21 to lock the counterweight disc 21. As Figure 5 shown.

[0038] The side cover gasket 10 is arranged between the side frame 1 and the side cover 5; the lower front cover gasket 11 is arranged between the lower front cover 6 and the lower frame 2, the lower rear cover gasket 12 is arranged between the lower rear cover 7 and the lower frame 2, and the lower side cover gasket 13 is arranged between the lower side cover gasket 13 and the lower frame 2; a middle cover gasket 15 is arranged between the middle frame 3 and the middle cover 9; thus, the sealing performance of the U-shaped frame cavity can be improved.

[0039] The materials of the side frame 1, the lower frame 2, the middle frame 3, the side cover 5, the lower front cover 6, the lower rear cover 7, the lower side cover 8, and the middle cover 9 are selected as hard aluminum 2A12-T4;

[0040] The materials of the reinforcing frame 4, the shaft 19, the bushing 20, the positioning retaining ring 22, and the lock nut 25 are selected as stainless steel 20Cr13;

[0041] The materials of the counterweight disc 21 and the counterweight screw 24 are selected as copper H65;

[0042] The materials of the side cover gasket 10, the lower front cover gasket 11, the lower rear cover gasket 12, the lower side cover gasket 13, the frame sealing ring 14, and the middle cover gasket 15 are selected as silicone rubber materials;

[0043] The slotted countersunk head screws 16, the hexagon socket head cap screws 17, the hexagon thin nuts 18, and the set screws 23 are selected as standard parts.

Claims

1. A centroid-adjustable combined U-shaped frame structure, characterized in that, The U-shaped frame structure includes side frame mechanisms, a lower frame mechanism, a middle frame mechanism, and a centroid adjustment component; the U-shaped frame structure includes two groups of side frame mechanisms and a lower frame mechanism; the lower frame mechanisms are symmetrically and fixedly connected to both sides of the middle frame mechanism, and a side frame mechanism is fixedly arranged on the upper part of each lower frame mechanism, thereby forming a U-shaped structure frame; the centroid adjustment component is arranged in the lower frame mechanism and is used to adjust the centroid to achieve stable control of the azimuth axis of the turntable.

2. The centroid-adjustable combined U-shaped frame structure according to claim 1, wherein The side frame mechanism includes a side frame and a side cover; the side frame and the side cover are fixedly connected.

3. The centroid-adjustable combined U-shaped frame structure according to claim 2, characterized in that, The lower frame mechanism includes: a lower frame, a lower front cover, a lower rear cover, and lower side covers; the lower front cover, the lower rear cover, and the lower side covers are fixedly connected to the lower frame.

4. The centroid-adjustable combined U-shaped frame structure according to claim 3, characterized in that, The middle frame mechanism includes: a middle frame and a middle cover; the middle cover is fixedly connected to the top surface of the middle frame.

5. The centroid-adjustable combined U-shaped frame structure according to claim 4, characterized in that, A kidney-shaped hole is arranged at the lower part of the side frame, and the reinforcing frame is inserted into the kidney-shaped hole at the lower part of the side frame and fixed; a kidney-shaped boss and a groove are arranged at the upper part of the lower frame and are matched and fixed with the kidney-shaped hole at the lower part of the side frame and the two side plates of the reinforcing frame.

6. The centroid-adjustable combined U-shaped frame structure according to claim 4, wherein, Kidney-shaped holes are arranged on both sides of the middle frame, and the reinforcing frame is inserted into the kidney-shaped holes on the side of the middle frame and fixed; a kidney-shaped boss and a groove arranged on the side of the lower frame are respectively matched and fixed with the kidney-shaped holes on the side of the middle frame and the two side plates of the reinforcing frame.

7. The centroid-adjustable combined U-shaped frame structure according to claim 4, wherein Rectangular grooves are arranged on the upper surface of the lower frame where it is installed with the side frame, and rectangular grooves are arranged on the side surface of the lower frame where it is installed with the middle frame, both of which are used for installing frame sealing rings.

8. The centroid-adjustable combined U-shaped frame structure according to claim 1, characterized in that, The centroid adjustment component includes: a shaft, a shaft sleeve, a counterweight disk, a positioning retaining ring, set screws, counterweight screws, and locking nuts; the shaft includes a disk and a shaft column, and the disk at the end of the shaft is fixedly connected to the vertical plate of the lower frame cavity; an external thread is arranged at the shaft column end of the shaft; an internal thread hole is arranged on the shaft sleeve, and a smooth shaft section and an external thread shaft section are arranged on the shaft section of the shaft sleeve; the shaft column end of the shaft is matched with the internal thread hole of the shaft sleeve; the inner hole of the counterweight disk is sleeved on the smooth shaft section of the shaft sleeve, the external thread shaft section of the shaft sleeve is matched with the internal thread hole of the positioning retaining ring, and the locking nut is threadedly matched with the column end of the shaft; after the positioning retaining ring rotates and fits with the counterweight disk, the set screws are tightened to realize the overall locking of the shaft sleeve, the counterweight disk, and the positioning retaining ring; the position of the counterweight disk along the axial direction is adjusted by rotating the shaft sleeve, and the locking nut is rotated synchronously to fit with the positioning retaining ring; after the centroid position is adjusted; the locking nut is tightened to lock the shaft sleeve.

9. The centroid-adjustable combined U-shaped frame structure according to claim 8, characterized in that Threaded holes are symmetrically distributed along the circumferential radial direction on the counterweight disk and are used for installing counterweight screws; the centroid is finely adjusted by increasing or decreasing the number of counterweight screws and changing the positions of the counterweight screws.

10. The centroid-adjustable combined U-shaped frame structure according to claim 4, wherein A side cover gasket is arranged between the side frame and the side cover; a lower front cover gasket is arranged between the lower front cover and the lower frame, a lower rear cover gasket is arranged between the lower rear cover and the lower frame, a lower side cover gasket is arranged between the lower side cover gasket and the lower frame; a middle cover gasket is arranged between the middle frame and the middle cover; it is used to improve the sealing performance of the U-shaped frame cavity.

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