Vacuum high-low temperature environment large compression ratio lifting and rotating motion test table

Abstract

This invention discloses a high-compression-ratio lifting and rotating motion test bench for vacuum high and low temperature environments, comprising a sample delivery and testing mechanism. The sample delivery and testing mechanism includes a rotating platform, a lifting platform, and a lifting linkage mechanism. The lifting platform is mounted on the lifting linkage mechanism, and the rotating platform is rotatably mounted on the lifting platform. The lifting linkage mechanism includes a U-shaped seat, a positive and negative threaded screw, a lifting assembly, and two sets of nut seats. The two sets of nut seats are spaced apart within the U-shaped opening of the U-shaped seat. The positive and negative threaded screw has two threaded sections with opposite directions of rotation. The two sets of nut seats are threadedly connected to the two threaded sections, respectively. Each set of nut seats is equipped with a lifting assembly, which includes an upper lifting arm and a lower lifting arm. One end of the upper lifting arm is hinged to the lifting platform, and the other end is hinged to the corresponding nut seat. One end of the lower lifting arm is hinged to the U-shaped seat, and the other end is hinged to the corresponding nut seat. This test bench exhibits high motion accuracy, meeting the accuracy requirements under vacuum high and low temperature environments.

Description

Technical Field

[0001] This invention relates to the field of vacuum high and low temperature environment testing technology, specifically to a vacuum high and low temperature environment high compression ratio lifting and rotating motion test platform. Background Technology

[0002] The electrically controlled sample delivery system is used for three-dimensional adjustment of the height, rotation angle, and horizontal position of the test specimen inside a vacuum container. The system can move in and out of the vacuum container along a guide rail and can be locked at any position on the guide rail. The system includes a height-adjustable mechanism with motor assistance and a turntable with electrically controllable angles under vacuum and cryogenic conditions. The test stand used in the electrically controlled sample delivery system (hereinafter referred to as the "sample delivery system") must meet the requirements for high-precision movement in a high-vacuum environment. However, existing sample delivery test stands have low movement accuracy, and their movement accuracy does not meet the testing requirements under high and low vacuum conditions. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high compression ratio lifting and rotating motion test platform for vacuum high and low temperature environments, which has high motion accuracy and meets the accuracy requirements for vacuum high and low temperature environments.

[0004] The objective of this invention is achieved through the following technical solution: a vacuum high and low temperature environment high compression ratio lifting and rotating motion test bench, including a sample delivery and testing mechanism disposed in a vacuum chamber, the sample delivery and testing mechanism being movable along the axis of the vacuum chamber, the sample delivery and testing mechanism including a rotating platform, a lifting platform and a lifting linkage mechanism, the lifting platform being disposed on the lifting linkage mechanism, and the rotating platform being rotatably disposed on the lifting platform;

[0005] The lifting linkage mechanism includes a U-shaped seat, a positive and negative threaded screw, a lifting assembly, and two sets of nut seats. The two sets of nut seats are spaced apart within the U-shaped opening of the U-shaped seat. The positive and negative threaded screw has two threaded sections with opposite directions of rotation. The two sets of nut seats are threadedly connected to the two threaded sections respectively. The lifting assembly is provided on each set of nut seats. The lifting assembly includes an upper lifting arm and a lower lifting arm. The upper lifting arm and the lower lifting arm are symmetrically arranged vertically. One end of the upper lifting arm is hinged to the lifting platform, and the other end is hinged to the corresponding nut seat. One end of the lower lifting arm is hinged to the U-shaped seat, and the other end is hinged to the corresponding nut seat.

[0006] Furthermore, the lifting linkage mechanism is provided in two sets, and the positive and negative threaded screws in the two sets of lifting linkage mechanisms are connected by a coupling.

[0007] Furthermore, the U-shaped seats in the two sets of lifting linkage mechanisms are connected by crossbeams, which are parallel to the positive and negative threaded screws. Two sets of crossbeams are provided, and the two sets of crossbeams are respectively connected to the two ends of the U-shaped opening of the U-shaped seat.

[0008] Furthermore, four movable rollers are rotatably arranged at intervals along the length of the crossbeam at its bottom, and two sets of guide rails are provided inside the vacuum chamber, with the movable rollers on the two sets of crossbeams slidingly adapted to the two sets of guide rails respectively.

[0009] Furthermore, a screw is threaded onto the crossbeam, a handwheel is fixed to the top of the screw, and a locking block is rotatably connected to the bottom of the screw. The bottom of the locking block has a locking groove that matches the cross-sectional shape of the guide rail.

[0010] Furthermore, guide rods are provided on both sides of the positive and negative threaded screws, the guide rods are parallel to the positive and negative threaded screws, and the guide rods are slidably adapted to the nut seat through linear bearings.

[0011] Furthermore, one end of one of the positive and negative threaded screws is connected to a drive mechanism, which includes a servo motor, a worm gear pair, and a reducer. The output shaft of the servo motor is drivenly connected to the input shaft of the reducer, the output shaft of the reducer is drivenly connected to the worm of the worm gear pair, and the output shaft of the worm gear pair is drivenly connected to the corresponding positive and negative threaded screw.

[0012] Furthermore, a rotating shaft is fixed at the bottom of the rotating platform, and the rotating shaft is rotatably connected to the lifting platform through a cross roller bearing. A worm gear is provided at the end of the rotating shaft away from the rotating platform, and a worm is rotatably provided on the lifting platform. The worm gear meshes with the worm, and a speed reducer is driven to one end of the worm. The speed reducer is driven to a motor.

[0013] Furthermore, two hinged wheels are movably installed at both ends of the upper and lower lifting arms. The two hinged wheels are spaced apart along a direction perpendicular to the axis of the positive and negative threaded screws. A hinge shaft is fixedly installed on the hinged wheel. The hinge shaft at one end of the upper lifting arm is rotatably connected to the lifting platform, and the hinge shaft at the other end is hinged to the U-shaped seat. The hinge shaft at one end of the lower lifting arm is rotatably connected to the lifting platform, and the hinge shaft at the other end is hinged to the U-shaped seat.

[0014] The beneficial effects of this invention are:

[0015] Due to the design of the upper and lower lifting arms, the nut seats do not rotate with the screws when they rotate; instead, they move linearly along the axial direction of the screws. Since the two nut seats of the lifting linkage mechanism are threadedly connected to the two threaded sections of the screws with opposite directions of rotation, the two nut seats move in opposite directions. This movement of the nut seats causes the upper and lower lifting arms to deflect, thereby raising or lowering the nut seats and the lifting platform via the lower lifting arm, and supporting the lifting platform's elevation via the upper lifting arm. This allows for the adjustment of the test bench's height. The combination of the screw pair and the lifting arms adjusts the height of the lifting platform, resulting in a smaller lifting range and facilitating more precise adjustments to meet the precision requirements of vacuum high and low temperature environments. Attached Figure Description

[0016] Figure 1 This is a perspective view of the lifting linkage mechanism in a vacuum high and low temperature environment high compression ratio lifting and rotating motion test bench of the present invention;

[0017] Figure 2 This is a perspective view of a vacuum high and low temperature environment high compression ratio lifting and rotating motion test platform according to the present invention;

[0018] Figure 3 This is a schematic diagram showing the connection between the rotating platform and the lifting platform in this invention;

[0019] In the diagram, 1-vacuum chamber, 2-rotating platform, 3-lifting platform, 4-U-shaped seat, 5-positive and negative threaded screw, 6-nut seat, 7-upper lifting arm, 8-lower lifting arm, 9-crossbeam, 10-moving roller, 11-screw, 12-handwheel, 13-locking block, 14-locking groove, 15-guide rod, 16-linear bearing, 17-servo motor, 18-worm gear pair, 19-reducer, 21-worm gear, 22-worm, 23-reducer, 24-motor, 25-articulated wheel, 26-articulated shaft. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0021] like Figures 1 to 3As shown, a high-compression-ratio lifting and rotating motion test bench for vacuum high and low temperature environments includes a sample delivery and testing mechanism installed inside a vacuum chamber 1. The sample delivery and testing mechanism can move along the axis of the vacuum chamber 1. The mechanism includes a rotating platform 2, a lifting platform 3, and a lifting linkage mechanism. The lifting platform 3 is mounted on the lifting linkage mechanism, and the rotating platform 2 is rotatably mounted on the lifting platform 3. A coordinate system is defined with the center of the straight section of the vacuum chamber 1 as the origin. The X-axis is vertically upward, the Z-axis is the direction of the chamber's axis, and the Y-axis satisfies the right-hand rule. The movement of the sample delivery and testing mechanism within the vacuum chamber 1 is along the Z-axis, the lifting direction of the lifting platform 3 is along the X-axis, and the rotation direction of the rotating platform 2 is along the Y-axis. The sample delivery and testing mechanism has three degrees of freedom, enabling it to adapt to the complex operating environment inside the vacuum chamber 1. The lifting linkage mechanism includes a U-shaped seat 4, a positive and negative threaded screw 5, a lifting assembly, and two sets of nut seats 6. The two sets of nut seats 6 are spaced apart within the U-shaped opening of the U-shaped seat 4. The positive and negative threaded screw 5 has two threaded sections with opposite directions of rotation. The two sets of nut seats 6 are threadedly connected to the two threaded sections respectively. Each set of nut seats 6 is equipped with a lifting assembly, which includes an upper lifting arm 7 and a lower lifting arm 8. The upper lifting arm 7 and the lower lifting arm 8 are symmetrically arranged vertically. One end of the upper lifting arm 7 is hinged to the lifting platform 3, and the other end is hinged to the corresponding nut seat 6. One end of the lower lifting arm 8 is hinged to the U-shaped seat 4. The other end is hinged to the corresponding nut seat 6. Due to the arrangement of the upper lifting arm 7 and the lower lifting arm 8, when the positive and negative threaded screw 5 rotates, the nut seat 6 does not rotate with the positive and negative threaded screw 5, but only moves linearly along the axial direction of the positive and negative threaded screw 5. Since the two nut seats 6 of the lifting linkage mechanism are respectively threaded to the two threaded sections of the positive and negative threaded screw 5 with opposite screw directions, the two nut seats 6 move in opposite directions. The movement of the nut seats 6 causes the upper lifting arm 7 and the lower lifting arm 8 to deflect, thereby raising or lowering the nut seat 6 and the lifting platform 3 through the lower lifting arm 8, and supporting the lifting platform 3 through the upper lifting arm 7 to achieve the lifting and adjustment of the test bench. The screw drive has a relatively high efficiency. With high transmission precision, the nut seat 6 moves one pitch for every one revolution of the screw 5. To improve the lifting stability of the lifting platform 3, a lifting assembly is added to the screw drive. The movement of the nut seat 6 is converted into the deflection motion of the upper lifting arm 7 and the lower lifting arm 8. The lifting assembly lifts the lifting platform by deflection. At the same time, the lifting assembly, including the upper lifting arm 7 and the lower lifting arm 8, adopts a symmetrical structure to ensure the stability of operation, thereby improving the motion precision and motion level. The height of the lifting platform 3 is adjusted by the combination of the screw pair and the lifting arm, making the lifting range of the lifting platform 3 smaller and facilitating higher precision adjustment to meet the precision adjustment requirements in vacuum high and low temperature environments.Preferably, the lifting linkage mechanism is provided in two sets. The positive and negative threaded screws 5 in the two sets of lifting linkage mechanisms are connected by couplings 9. The two sets of lifting linkage mechanisms are respectively connected to the two ends of the lifting platform 3, so that the test bench has a symmetrical structure, high strength and operating temperature, and at the same time improves structural rigidity and low temperature adaptability.

[0022] Furthermore, such as Figure 1 As shown, two hinged wheels 25 are movably mounted on both ends of the upper lifting arm 7 and the lower lifting arm 8. The two hinged wheels 25 are spaced apart along a direction perpendicular to the axis of the positive and negative threaded screws 5. A hinge shaft 26 is fixedly mounted on the hinged wheel 25. The hinge shaft 26 at one end of the upper lifting arm 7 is rotatably connected to the lifting platform 3, and the hinge shaft 26 at the other end is hinged to the U-shaped seat 4. The hinge shaft 26 at one end of the lower lifting arm 8 is rotatably connected to the lifting platform 3, and the hinge shaft 26 at the other end is hinged to the U-shaped seat 4. Two sets of hinged wheels 25 are provided at both ends of the upper lifting arm 7 and the lower lifting arm 8, so that the upper lifting arm 7 and the lower lifting arm 8 are arranged in a symmetrical structure. In one lifting linkage mechanism, the two ends of the top of the upper lifting arm 7 act on the two sides of one end of the lifting platform 3, and in the other lifting linkage mechanism, the two ends of the top of the upper lifting arm 7 act on the two sides of the other end of the lifting platform 3, so that the lifting point on the lifting platform 3 is rectangular, ensuring the uniformity and stability of the lifting of the lifting platform 3.

[0023] Furthermore, such as Figure 2 As shown, the U-shaped seats 4 in the two sets of lifting linkage mechanisms are connected by crossbeams 9. The crossbeams 9 are parallel to the positive and negative threaded screws 5. There are two sets of crossbeams 9, which are respectively connected to the two ends of the U-shaped opening of the U-shaped seat 4. Four movable rollers 10 are rotatably arranged at intervals along the length of the bottom of the crossbeams 9. Two sets of guide rails are arranged inside the vacuum chamber 1. The movable rollers 10 on the two sets of crossbeams 9 slide and adapt to the two sets of guide rails respectively. The movable rollers 10 drive the entire sample delivery and testing mechanism to move on the guide rails to realize sample delivery. The detection mechanism is positioned along the Z-axis. A screw 11 is threaded onto the crossbeam 9. A handwheel 12 is fixed to the top of the screw 11, and a locking block 13 is rotatably connected to the bottom of the screw 11. The bottom of the locking block 13 has a locking groove 14 that matches the cross-sectional shape of the guide rail. Rotating the handwheel 12 causes the screw 11 to move the locking block 13 closer to the guide rail, so that the locking groove 14 of the locking block 13 matches the guide rail and the locking block 13 is pressed against the guide rail, thereby limiting the position of the sample delivery detection mechanism.

[0024] Furthermore, guide rods 15 are provided on both sides of the positive and negative threaded screws 5. The guide rods 15 are parallel to the positive and negative threaded screws 5. The guide rods 15 are slidably adapted to the nut seat 6 through the linear bearing 16. The guide rods 15 guide the movement of the nut seat 6 to ensure the consistency of the overall mechanism's movement. One end of one of the positive and negative threaded screws 5 is connected to a drive mechanism, which includes a servo motor 17, a worm gear pair 18, and a reducer 19. The output shaft of the servo motor 17 is driven by the input shaft of the reducer 19. The output shaft of the reducer 19 is driven by the worm gear pair 18. The output shaft of the worm gear pair 18 is driven by the corresponding positive and negative threaded screws 5. The servo motor 17 drives the reducer 19 to move. After the reducer 19 reduces the speed of the servo motor 17, it drives the worm gear pair 18 to move. The worm gear pair 18 drives the positive and negative threaded screws 5 to rotate. It has good self-locking characteristics and can reliably stop the lifting platform 3 at any position.

[0025] Furthermore, such as Figure 3 As shown, a rotating shaft is fixed at the bottom of the rotating platform 2. The rotating shaft is rotatably connected to the lifting platform 3 via a cross roller bearing 20. A worm gear 21 is provided at the end of the rotating shaft away from the rotating platform 2. A worm 22 is rotatably provided on the lifting platform 3. The worm gear 21 meshes with the worm 22. A reducer 23 is driven to one end of the worm 22. The reducer 23 is driven to a motor 24. The motor 24 drives the reducer 23 to run. The reducer 23 reduces the speed of the motor 24, causing the reducer 23 to drive the worm 22 to rotate. The worm 22 drives the worm gear 21 to rotate, thereby driving the rotating platform 2 to rotate on the lifting platform 3, realizing the Y-axis movement of the sample delivery and testing mechanism. Utilizing the self-locking property of the worm gear, the rotating platform 2 can be rotated to any position. The cross roller bearing 20, which can withstand large axial and radial loads simultaneously, is used as a rotating support element to improve the overall strength of the sample delivery and testing mechanism.

[0026] In summary, to adapt to low-temperature environments, the structural design ensures the consistency of materials in the same direction as much as possible. The overall material of its sample delivery and testing mechanism is mainly stainless steel SUS316L and forged aluminum LC4, which meets the requirements for use in high and low temperature vacuum environments. Among them, the diameter of the rotating platform 2 is 1800mm, the overall length of the sample delivery and testing mechanism is 2770mm, and the total mass is no more than 3500kg. The distance from the lowest point of the rotating platform 2 to the center of the vacuum container is 805mm, the lifting adjustment stroke is greater than 410mm, and the highest point is 395mm from the center of the container. The rotating platform 2 can achieve continuous full-circle rotation.

[0027] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Furthermore, those skilled in the art will understand that the beneficial effects to be achieved by this invention are merely to achieve better beneficial effects compared with the current embodiments in the prior art under specific conditions, rather than to directly achieve the best use effect in the industry.

[0028] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A vacuum high-low temperature environment large compression ratio lifting-rotary motion test table, comprising a sample feeding and detecting mechanism arranged in a vacuum chamber (1), the sample feeding and detecting mechanism being movable along an axis of the vacuum chamber (1), characterized in that, The sample sending and detecting mechanism comprises a rotating platform (2), a lifting platform (3) and a lifting linkage mechanism, the lifting platform (3) is arranged on the lifting linkage mechanism, and the rotating platform (2) is rotationally arranged on the lifting platform (3); The lifting linkage mechanism comprises a U-shaped seat (4), a right and left threaded lead screw (5), a lifting assembly and two groups of nut seats (6), the two groups of nut seats (6) are arranged in the U-shaped opening of the U-shaped seat (4) at intervals, the right and left threaded lead screw (5) is provided with two threaded sections with opposite rotation directions, the two groups of nut seats (6) are threadedly connected to the two threaded sections respectively, the lifting assembly is arranged on each of the two groups of nut seats (6), the lifting assembly comprises an upper lifting arm (7) and a lower lifting arm (8), the upper lifting arm (7) and the lower lifting arm (8) are arranged symmetrically, one end of the upper lifting arm (7) is hingedly connected to the lifting platform (3), the other end of the upper lifting arm (7) is hingedly connected to the corresponding nut seat (6), one end of the lower lifting arm (8) is hingedly connected to the U-shaped seat (4), and the other end of the lower lifting arm (8) is hingedly connected to the corresponding nut seat (6); The lifting linkage mechanism is provided with two groups, and the right and left threaded lead screws (5) in the two groups of lifting linkage mechanisms are connected through a shaft coupling; The U-shaped seats (4) in the two groups of lifting linkage mechanisms are connected through a cross beam (9), the cross beam (9) is parallel to the right and left threaded lead screw (5), the cross beam (9) is provided with two groups, and the two groups of cross beams (9) are connected to the two ends of the U-shaped opening of the U-shaped seat (4) respectively; Four moving rollers (10) are arranged on the bottom of the cross beam (9) at intervals along the length direction of the cross beam (9), two groups of guide rails are arranged in the vacuum chamber (1), and the moving rollers (10) on the two groups of cross beams (9) are slidably matched with the two groups of guide rails respectively; A screw rod (11) is threadedly connected to the cross beam (9), a hand wheel (12) is fixed to the top of the screw rod (11), a locking block (13) is rotationally connected to the bottom of the screw rod (11), and a locking groove (14) matched with the cross section shape of the guide rail is formed in the bottom of the locking block (13); A rotating shaft is fixed to the bottom of the rotating platform (2), the rotating shaft is rotationally connected to the lifting platform (3) through a cross roller bearing, a worm wheel (21) is arranged at the end of the rotating shaft away from the rotating platform (2), a worm (22) is rotationally arranged on the lifting platform (3), the worm wheel (21) is meshed with the worm (22), one end of the worm (22) is transmissionally connected to a speed reducer (23), and the speed reducer (23) is transmissionally connected to a motor (24).

2. The vacuum high-low temperature environment large compression ratio lifting-rotary motion test table according to claim 1, characterized in that, Guide rods (15) are arranged on the two sides of the right and left threaded lead screw (5), the guide rods (15) are parallel to the right and left threaded lead screw (5), and the guide rods (15) are slidably matched with the nut seats (6) through linear bearings (16).

3. The vacuum high-low temperature environment large compression ratio lifting-rotary motion test table according to claim 2, characterized in that, One end of one of the right and left reverse screw rods (5) is connected with a driving mechanism, the driving mechanism comprises a servo motor (17), a worm and gear pair (18) and a speed reducer (19), the output shaft of the servo motor (17) is in transmission connection with the input shaft of the speed reducer (19), the output shaft of the speed reducer (19) is in transmission connection with the worm of the worm and gear pair (18), and the output shaft of the worm and gear pair (18) is in transmission connection with the corresponding reverse screw rod (5).

4. The vacuum high-low temperature environment large compression ratio lifting-rotary motion test table according to claim 1, characterized in that, Two hinge wheels (25) are movably arranged at the two ends of the upper lifting arm (7) and the lower lifting arm (8), the two hinge wheels (25) are arranged in a direction perpendicular to the axis of the reverse screw rod (5), a hinge shaft (26) is fixedly arranged on the hinge wheel (25), the hinge shaft (26) at one end of the upper lifting arm (7) is in rotation connection with the lifting platform (3), the hinge shaft (26) at the other end is in hinge connection with the U-shaped seat (4), the hinge shaft (26) at one end of the lower lifting arm (8) is in rotation connection with the lifting platform (3), and the hinge shaft (26) at the other end is in hinge connection with the U-shaped seat (4).

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