A double-scissors synchronous lifting and translation device

Abstract

The present invention belongs to the technical field of elevators, and discloses a double-scissors synchronous lifting and translation device. The double-scissors synchronous lifting and translation device includes translation guide rails fixed on both sides of the base, and a set of double-scissors lifting mechanisms are installed on the translation guide rails on each side; each set of double-scissors lifting mechanisms includes a left-right symmetrical scissor mechanism I and a scissor mechanism II, and a lifting electric cylinder located in the middle; the lifting electric cylinder is a double-acting electric cylinder, which synchronously drives the scissor mechanism I and the scissor mechanism II to achieve the lifting and falling of the heavy-loaded object; it also includes a translation electric cylinder fixed on both sides of the base, and the translation electric cylinder drives the heavy-loaded object to move left and right along the translation guide rails through a translation connecting shaft fixed on the lower surface of the heavy-loaded object. The double-scissors synchronous lifting and translation device has a uniform load distribution and smooth movement, which improves the coordination and synchronization of the lifting process, reduces the difficulty of electrical control, improves the accuracy of translation movement, reduces the difficulty of installation and debugging, and improves operating efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel equipment, and in particular relates to a double-scissors synchronous lifting and translation device. Background Art

[0002] Large, heavy-duty wind tunnel top doors are crucial components for hoisting large wind tunnel models. They feature large size, long travel, heavy loads, high positioning accuracy, high frequency of use, and the ability to ensure good sealing of the wind tunnel cabin when closed. The top door device must have both lifting and translation capabilities. Currently, lifting large, heavy-duty top doors generally requires the arrangement of four or more lifting points, with an electric or hydraulic actuator positioned at each location to synchronously lift the heavy-duty top door. This solution requires a large installation space and high motion synchronization requirements. Once any points become out of sync, the top door can easily experience unstable motion, uneven force on the electric or hydraulic actuators, and operational jams.

[0003] For heavy-load translation devices with large spans, screw transmission or direct drive by motors installed at both ends of the span are usually used to achieve the translation of the heavy-load top door. The former's multiple back-and-forth movements can easily lead to large gaps and the translation device can become stuck. The latter can easily lead to unstable movement of the opening and closing device, resulting in defects such as poor sealing of the cabin top door and reduced sealing.

[0004] Currently, there is an urgent need to develop a double-scissors synchronous lifting and translation device suitable for large and heavy-loaded top doors of wind tunnels. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a double-scissors synchronous lifting and translation device to achieve short-distance lifting and translation of a large and heavy-loaded top door of a wind tunnel.

[0006] The double-scissors synchronous lifting and translation device of the present invention comprises two sets of translation mechanisms and lifting mechanisms that are symmetrical front and back. The translation mechanisms are used to translate heavy-loaded objects, and the lifting mechanisms are used to lift and lower heavy-loaded objects.

[0007] Each translation mechanism includes a translation guide rail fixed to a base and a translation electric cylinder, with a lifting mechanism mounted on the translation guide rail; it also includes a translation connecting shaft fixed to the lower surface of the heavy-loaded object, with the output shaft of the translation electric cylinder connected to the translation connecting shaft via a universal joint of the translation electric cylinder;

[0008] When the output shafts of the translation electric cylinders of the two translation mechanisms extend synchronously to the right, the heavy-loaded object and the lifting mechanism are pushed to translate from the initial position to a predetermined position through the translation connecting shaft; when the translation electric cylinders on both sides retract synchronously to the left, the heavy-loaded object and the lifting mechanism are driven to translate from the predetermined position to the initial position through the translation connecting shaft;

[0009] Each lifting mechanism is a double-scissor lifting mechanism; the double-scissor lifting mechanism includes a left-right symmetrical scissor mechanism I and a scissor mechanism II, and a lifting electric cylinder located between the scissor mechanisms I and II; the lifting electric cylinder is a double-acting servo electric cylinder, the left drive shaft of the lifting electric cylinder is connected to the electric cylinder bracket of the scissor mechanism I through a lifting electric cylinder threaded connector, and the right drive shaft of the lifting electric cylinder is connected to the electric cylinder bracket of the scissor mechanism II through a lifting electric cylinder threaded connector; the central rotating shafts of the scissor mechanisms I and II are respectively fixed to the left and right support points on the lower surface of the heavy-loaded object; a roller is installed on each of the two bottom corners of the scissor mechanism I, and a roller is also installed on each of the two bottom corners of the scissor mechanism II, each roller is mounted on a translation guide rail, and the roller rolls back and forth along the translation guide rail; the lifting electric cylinder synchronously drives the scissor mechanisms I and II through the electric cylinder bracket of the scissor mechanism I and the electric cylinder bracket of the scissor mechanism II;

[0010] When the driving shafts on the left and right sides of the two sets of lifting cylinders are extended synchronously, the scissor mechanisms I and II on the left and right sides are lifted at the same time, and the heavy-loaded object is lifted up. When the driving shafts on the left and right sides of the two sets of lifting cylinders are shortened synchronously, the scissor mechanisms I and II on the left and right sides are lowered at the same time, and the heavy-loaded object falls down.

[0011] Furthermore, a limit block is provided on the lower surface of the heavy-loaded object, and a limit switch is provided on the base. When the heavy-loaded object moves to the point where the limit switch contacts the limit block, the translation electric cylinder stops working.

[0012] Furthermore, the support point on the lower surface of the heavy-loaded object is the top door support seat, and the central rotating shaft of the scissors mechanism is the connecting shaft passing through the top door support seat; the two bottom corners of the scissors mechanism are opened around the connecting shaft to realize the lifting of the heavy-loaded object; the two bottom corners of the scissors mechanism are merged around the connecting shaft to realize the falling of the heavy-loaded object.

[0013] Furthermore, on the outside of the double scissors lifting mechanism, the rollers on the left side of the scissor mechanism I and the scissor mechanism II are connected by a roller connecting rod I, and the rollers on the right side of the scissor mechanism I and the scissor mechanism II are connected by a roller connecting rod II; under the restriction of the roller connecting rod I and the roller connecting rod II, the scissor mechanism I and the scissor mechanism II are synchronously lifted and lowered.

[0014] Furthermore, the electric cylinder bracket is located on the inner side of the double scissors lifting mechanism.

[0015] Furthermore, the translation guide rail is an I-shaped rail steel, and the translation guide rail is fixed to the upper surface of the base through a rail clamp.

[0016] The jacking mechanism in the double-scissors synchronous jacking and translation device of the present invention adopts an electric cylinder-double-scissors jacking structure, which can reduce the traditional four-point power output to two-point power output, but does not reduce the number of support points, and still maintains four support points; each power point drives a set of double-scissors jacking mechanisms, which reduces the coordination requirements of the power points during the jacking process, and improves the movement synchronization and jacking efficiency during the jacking process without affecting the balance performance.

[0017] The translation mechanism in the double-scissors synchronous lifting and translation device of the present invention is realized by dual electric cylinders, dual guide rails, displacement synchronous feedback and dual electric cylinder synchronous control method. The direct connection structure directly drives the heavy-loaded object through the electric cylinder, reduces the transmission nodes and improves the transmission efficiency; the direct connection structure can effectively avoid the disadvantage of large transmission gap, improve the position accuracy of reciprocating motion, and the accuracy reaches the electric cylinder motion accuracy, that is, sub-millimeter level.

[0018] The lifting mechanism and the translation mechanism in the double-scissors synchronous lifting and translation device of the present invention are connected by a universal joint, thereby eliminating double errors in the lifting and translation processes.

[0019] The double-scissors synchronous jacking and translation device of the present invention has the advantages of high precision, good synchronous movement and smooth operation, which can ensure the sealing performance of the wind tunnel cabin; improves the coordinated synchronization of the jacking process and reduces the difficulty of electrical control; improves the accuracy of translation movement and reduces the difficulty of installation and debugging; overall has the advantages of uniform load distribution and smooth movement, and at the same time, improves operating efficiency, saves costs and installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram (stereoscopic diagram) of the double-scissors synchronous lifting and translation device of the present invention;

[0021] Figure 2 Schematic diagram (front view) of the double-scissors lifting mechanism in the double-scissors synchronous lifting and translation device of the present invention;

[0022] Figure 3 This is a motion diagram of the dual-scissors synchronous lifting and translation device of Example 1 (closed in place);

[0023] Figure 4 This is a motion diagram of the dual-scissors synchronous lifting and translation device of Example 1 (lifted into place);

[0024] Figure 5 This is a motion view of the dual-scissors synchronous lifting and translation device of Example 1 (translated into place).

[0025] In the figure, 1. Base; 2. Translation guide rail I; 3. Translation electric cylinder; 4. Lifting electric cylinder; 5. Double scissor lifting mechanism; 6. Translation connecting shaft; 7. Heavy-load object; 8. Translation guide rail II; 9. Sealing ring; 10. Lifting electric cylinder threaded connector; 11. Translation electric cylinder universal connector;

[0026] 501. Scissor mechanism I; 502. Scissor mechanism II; 503. Limit block; 504. Top door support seat; 505. Connecting shaft; 506. Roller; 507. Roller connecting rod I; 508. Roller connecting rod II; 509. Limit switch. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 、 Figure 2 As shown, the double-scissors synchronous lifting and translation device of this embodiment includes two sets of translation mechanisms and lifting mechanisms that are symmetrical front and back. The translation mechanism is used to translate the heavy-loaded object 7, and the lifting mechanism is used to lift the heavy-loaded object 7;

[0029] Each translation mechanism includes a translation guide rail and a translation electric cylinder 3 fixed to a base 1, with a lifting mechanism mounted on the translation guide rail; it also includes a translation connecting shaft 6 fixed to the lower surface of a heavy-load object 7, and the output shaft of the translation electric cylinder 3 is connected to the translation connecting shaft 6 via a translation electric cylinder universal connector 11;

[0030] When the output shafts of the translation cylinders 3 of the two translation mechanisms extend synchronously to the right, the heavy-loaded object 7 and the lifting mechanism are pushed to translate from the initial position to a predetermined position through the translation connecting shaft 6; when the translation cylinders 3 on both sides retract synchronously to the left, the heavy-loaded object 7 and the lifting mechanism are driven to translate from the predetermined position to the initial position through the translation connecting shaft 6;

[0031] Each lifting mechanism is a double scissors lifting mechanism 5; the double scissors lifting mechanism 5 includes a left-right symmetrical scissors mechanism I 501 and a scissors mechanism II 502, and a lifting electric cylinder 4 located between the scissors mechanism I 501 and the scissors mechanism II 502; the lifting electric cylinder 4 is a double-acting servo electric cylinder, the left driving shaft of the lifting electric cylinder 4 is connected to the electric cylinder bracket of the scissors mechanism I 501 through the lifting electric cylinder threaded connector 10, and the right driving shaft of the lifting electric cylinder 4 is connected to the electric cylinder bracket of the scissors mechanism II 502 through the lifting electric cylinder threaded connector 10; the scissors mechanism I 50 The central rotating shafts of the scissor mechanism 1 and the scissor mechanism II 502 are respectively fixed to the left and right supporting points of the lower surface of the heavy-loaded object 7; a roller 506 is installed on each of the two bottom corners of the scissor mechanism I 501, and a roller 506 is also installed on each of the two bottom corners of the scissor mechanism II 502. Each roller 506 is mounted on a translation guide rail and rolls back and forth along the translation guide rail; the lifting cylinder 4 synchronously drives the scissor mechanism I 501 and the scissor mechanism II 502 through the cylinder bracket of the scissor mechanism I 501 and the cylinder bracket of the scissor mechanism II 502;

[0032] When the driving shafts on the left and right sides of the two sets of lifting electric cylinders 4 are synchronously extended, the scissor mechanisms I 501 and scissor mechanisms II 502 on the left and right sides are lifted at the same time, and the heavy-loaded object 7 is lifted upward. When the driving shafts on the left and right sides of the two sets of lifting electric cylinders 4 are synchronously shortened, the scissor mechanisms I 501 and scissor mechanisms II 502 on the left and right sides are dropped at the same time, and the heavy-loaded object 7 falls downward.

[0033] Furthermore, a limit block 503 is provided on the lower surface of the heavy-loaded object 7, and a limit switch 509 is provided on the base 1. When the heavy-loaded object 7 moves to the point where the limit switch 509 contacts the limit block 503, the translation electric cylinder 3 stops working.

[0034] Furthermore, the support point on the lower surface of the heavy-loaded object 7 is the top door support seat 504, and the central rotating axis of the scissors mechanism is the connecting axis 505 that passes through the top door support seat 504; the two bottom corners of the scissors mechanism are opened around the connecting axis 505 to realize the lifting of the heavy-loaded object 7; the two bottom corners of the scissors mechanism are merged around the connecting axis 505 to realize the falling of the heavy-loaded object 7.

[0035] Furthermore, on the outside of the double scissors lifting mechanism 5, the roller 506 on the left side of the scissor mechanism I501 and the scissor mechanism II502 is connected by a roller connecting rod I507, and the roller 506 on the right side of the scissor mechanism I501 and the scissor mechanism II502 is connected by a roller connecting rod II508; under the restriction of the roller connecting rod I507 and the roller connecting rod II508, the scissor mechanism I501 and the scissor mechanism II502 are synchronously lifted and lowered.

[0036] Furthermore, the electric cylinder bracket is located inside the double scissors lifting mechanism 5 .

[0037] Furthermore, the translation guide rail is an I-shaped rail steel, and the translation guide rail is fixed to the upper surface of the base 1 through a rail clamp.

[0038] Example 1: This embodiment of a dual-scissor synchronous lifting and translation device is used for the top hatch of a wind tunnel test section. Base 1 is the wind tunnel test section, and the heavy-loaded object 7 is the top window cover. A sealing ring 9 is provided on the top surface of the top cover. The translation guides include translation guide rails I2 and II8 located on the front and rear sides of base 1. The top cover weighs 10 tons, has a lifting height of 50 mm, a translation distance of 2.5 meters, and a reset accuracy of within 1 mm.

[0039] The double-scissors synchronous lifting and translation device of this embodiment has three motion states:

[0040] like Figure 3 In the closed position shown, the top cover is fixed on the top window, and the sealing between the top cover and the top window is achieved by the sealing ring 9;

[0041] like Figure 4 In the shown lifted position, the top cover is lifted to the highest position;

[0042] like Figure 5 In the translated position shown, the top cover translates from the highest position to a predetermined position, opening the top window.

[0043] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the description and implementation methods. For those familiar with the art, all features disclosed in the present invention, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A double scissors synchronous lifting and translation device, characterized in that: The double-scissors synchronous lifting and translation device comprises two sets of translation mechanisms and lifting mechanisms that are symmetrical in front and back, the translation mechanism being used to translate the heavy-loaded object (7), and the lifting mechanism being used to lift the heavy-loaded object (7); Each translation mechanism includes a translation guide rail fixed on a base (1) and a translation electric cylinder (3), with a group of lifting mechanisms installed on the translation guide rail; and also includes a translation connecting shaft (6) fixed on the lower surface of the heavy-load object (7), and the output shaft of the translation electric cylinder (3) is connected to the translation connecting shaft (6) through a translation electric cylinder universal connector (11); When the output shafts of the translation electric cylinders (3) of the two translation mechanisms extend synchronously to the right, the heavy-loaded object (7) and the lifting mechanism are pushed to translate from the initial position to a predetermined position through the translation connecting shaft (6); when the translation electric cylinders (3) on both sides are retracted synchronously to the left, the heavy-loaded object (7) and the lifting mechanism are driven to translate from the predetermined position to the initial position through the translation connecting shaft (6); Each lifting mechanism is a double scissors lifting mechanism (5); the double scissors lifting mechanism (5) includes a left-right symmetrical scissors mechanism I (501) and a scissors mechanism II (502), and a lifting electric cylinder (4) located between the scissors mechanism I (501) and the scissors mechanism II (502); the lifting electric cylinder (4) is a double-acting servo electric cylinder, the left driving shaft of the lifting electric cylinder (4) is connected to the electric cylinder bracket of the scissors mechanism I (501) through the lifting electric cylinder threaded connector (10), and the right driving shaft of the lifting electric cylinder (4) is connected to the electric cylinder bracket of the scissors mechanism II (502) through the lifting electric cylinder threaded connector (10); the scissors mechanism I (5 01) and the central rotating shafts of the scissor mechanism II (502) are respectively fixed on the left support point and the right support point of the lower surface of the heavy-load object (7); a roller (506) is installed on each of the two bottom corners of the scissor mechanism I (501), and a roller (506) is also installed on each of the two bottom corners of the scissor mechanism II (502), and each roller (506) is mounted on the translation guide rail, and the roller (506) rolls back and forth along the translation guide rail; the lifting electric cylinder (4) synchronously drives the scissor mechanism I (501) and the scissor mechanism II (502) through the electric cylinder bracket of the scissor mechanism I (501) and the electric cylinder bracket of the scissor mechanism II (502); When the driving shafts on the left and right sides of the two sets of lifting electric cylinders (4) are synchronously extended, the scissor mechanisms I (501) and scissor mechanisms II (502) on the left and right sides are simultaneously lifted, and the heavy-loaded object (7) is lifted upward; when the driving shafts on the left and right sides of the two sets of lifting electric cylinders (4) are synchronously shortened, the scissor mechanisms I (501) and scissor mechanisms II (502) on the left and right sides are simultaneously lowered, and the heavy-loaded object (7) falls downward; The support point on the lower surface of the heavy-loaded object (7) is the top door support seat (504), and the central rotation axis of the scissor mechanism is the connecting shaft (505) that passes through the top door support seat (504); the two bottom corners of the scissor mechanism are opened around the connecting shaft (505) to achieve the falling of the heavy-loaded object (7); the two bottom corners of the scissor mechanism are combined around the connecting shaft (505) to achieve the lifting of the heavy-loaded object (7); For the scissor mechanism I (501) on the left, the electric cylinder bracket includes a corresponding left H-shaped bracket and a right arc bracket, the top of the H-shaped bracket and the arc bracket are fixed to the top door support seat (504) through a connecting shaft (505), and a roller (506) is installed at the bottom corner of the H-shaped bracket and the arc bracket respectively; for the scissor mechanism II (502) on the right, it includes a corresponding left arc bracket and a right H-shaped bracket, the top of the arc bracket and the H-shaped bracket are fixed to the top door support seat (504) through a connecting shaft (505), and a roller (506) is installed at the bottom corner of the H-shaped bracket and the arc bracket respectively; The electric cylinder bracket is located on the inner side of the double scissors lifting mechanism (5); on the outer side of the double scissors lifting mechanism (5), the roller (506) of the H-shaped bracket on the left side of the scissors mechanism I (501) and the roller (506) of the arc bracket on the left side of the scissors mechanism II (502) are connected by a roller connecting rod I (507), and the roller (506) of the arc bracket on the right side of the scissors mechanism I (501) and the roller (506) of the H-shaped bracket on the right side of the scissors mechanism II (502) are connected by a roller connecting rod II (508); under the restriction of the roller connecting rod I (507) and the roller connecting rod II (508), the scissors mechanism I (501) and the scissors mechanism II (502) roll back and forth along the translation guide rail through the roller (506) to perform synchronous lifting and lowering.

2. A double scissors synchronous lifting and translation device according to claim 1, characterized in that: A limit block (503) is provided on the lower surface of the heavy-loaded object (7), and a limit switch (509) is provided on the base (1). When the heavy-loaded object (7) moves to the point where the limit switch (509) contacts the limit block (503), the translation electric cylinder (3) stops working.

3. The double-scissors synchronous lifting and translation device according to claim 1, characterized in that: The translation guide rail is an I-shaped rail steel, and the translation guide rail is fixed to the upper surface of the base (1) through a rail clamp.

Images