Scissor fork type telescopic mechanism driven by screw rod

Abstract

The invention discloses a shear fork type telescopic mechanism driven by a screw. The shear fork type telescopic mechanism comprises a power device and a transmission mechanism. A lead screw and nut transmission mechanism is adopted, the lead screw cannot be driven by any axial force acting on the nut, and mechanical self-locking performance is achieved; a small-power servo motor can be used for driving, and the bearing ratio is very high; the scissor-type telescopic mechanism is small in size, simple in structure and easy to control.

Description

Technical Field

[0001] The present invention relates to the field of mechanical engineering, and particularly to a screw-driven scissor-type telescopic mechanism. Background Art

[0002] Traditional telescopic mechanism drive solutions, pneumatic drive and hydraulic drive, have significant defects in engineering applications. The pneumatic system, due to its reliance on compressed air, has low energy efficiency, and the compressibility of the gas results in poor control accuracy, making it difficult to achieve precise movements. At the same time, the noise of the air compressor and the oil mist pollution in the compressed air limit its application in clean scenarios, and the risk of air source interruption and frequent seal maintenance further reduce its reliability. Although the hydraulic system can output greater driving force, it has a high risk of oil leakage, is prone to environmental pollution and a sharp increase in maintenance costs. The change in the viscosity of the oil fluid at low temperatures will cause response hysteresis, and at high temperatures, it may cause system failures due to oil oxidation. Both face energy efficiency bottlenecks and require external power units (air compressors or hydraulic stations), resulting in bulky equipment and poor mobility. There is a need for a drive mechanism with a small volume, simple structure, and high load ratio. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a screw-driven scissor-type telescopic mechanism with a high load ratio and linear motion accuracy.

[0004] The technical solution of the present invention is: a screw-driven scissor-type telescopic mechanism, including a power device 1 and a transmission mechanism 2.

[0005] The power device 1 includes a servo motor 3, a first fixed end 4, a screw 5, and a threaded flange 6; wherein, the servo motor 3 is fixedly connected inside the first fixed end 4 by bolts, the output shaft end of the servo motor 3 is fixed to the screw 5, and the threaded flange 6 is installed on the screw 5 to form a screw pair.

[0006] The transmission mechanism 2 includes a first support block 7, a first connecting rod 8, a second connecting rod 9, a first driven rod 10, a second driven rod 11, a first support column 12, a gasket 13, a third connecting rod 14, a fourth connecting rod 15, a second support block 16, a second support column 17, a third support block 18, a fifth connecting rod 19, a sixth connecting rod 20, a third driven rod 21, a fourth driven rod 22, and a second fixed end 23. Among them, the first support block 7 is fixedly connected to the threaded flange 6 in the power device 1 by bolts, and the first support block 7 is connected to the middle parts of the first connecting rod 8 and the second connecting rod 9 through pins to form a rotating pair; one end of the first connecting rod 8 is connected to the toothless end of the first driven rod 10, the first support column 12, and the gasket 13 through pins to form a rotating pair, and the other end of the first connecting rod 8 is connected to the fourth connecting rod 15 and the second support column 17 through pins to form a rotating pair; one end of the second connecting rod 9 is connected to the toothless end of the second driven rod 11 and the first support column 12 through pins to form a rotating pair, and the other end of the second connecting rod 9 is connected to the third connecting rod 14 and the second support column 17 through pins to form a rotating pair; the toothed end of the first driven rod 10 meshes with the toothed end of the second driven rod 11 and is fixed to the first fixed end 4 through a pin; the second support block 16 is connected to the middle parts of the third connecting rod 14 and the fourth connecting rod 15 through pins to form a rotating pair, and the third support block 18 is connected to the middle parts of the fifth connecting rod 19 and the sixth connecting rod 20 through pins to form a rotating pair; one end of the fifth connecting rod 19 is connected to the fourth connecting rod 15 and the second support column 17 through pins to form a rotating pair, and the other end of the fifth connecting rod 19 is connected to the toothless end of the fourth driven rod 22 through a pin to form a rotating pair; one end of the sixth connecting rod 20 is connected to the third connecting rod 14 and the second support column 17 through pins to form a rotating pair, and the other end of the sixth connecting rod 20 is connected to the toothless end of the third driven rod 21 through a pin to form a rotating pair; the toothed end of the third driven rod 21 meshes with the toothed end of the fourth driven rod 22 and is fixed to the second fixed end 23 through a pin.

[0007] The present invention has the following beneficial effects compared with the prior art: 1. The present invention adopts a lead screw-nut transmission mechanism. The lead screw cannot be driven by any axial force acting on the nut and has mechanical self-locking, which is safe and reliable. 2. The present invention can be driven by a small-power servo motor and has a high load ratio. 3. The present invention is small in size, simple in structure, not easily damaged, and has high linear motion accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a screw-driven scissor-type telescopic mechanism provided according to an embodiment of the present invention;

[0009] Figure 2 is an exploded view of a screw-driven scissor-type telescopic mechanism provided according to an embodiment of the present invention;

[0010] Figure 3 is the assembly drawing of the screw-driven scissor-type telescopic mechanism provided according to the embodiments of the present invention;

[0011] Figure 4 is the view of the screw-driven scissor-type telescopic mechanism in the extended state;

[0012] The reference numerals in the figure are as follows: 1 - power device, 2 - transmission mechanism, 3 - servo motor, 4 - first fixed end, 5 - screw, 6 - threaded flange, 7 - first support block, 8 - first connecting rod, 9 - second connecting rod, 10 - first driven rod, 11 - second driven rod, 12 - first support column, 13 - gasket, 14 - third connecting rod, 15 - fourth connecting rod, 16 - second support block, 17 - second support column, 18 - third support block, 19 - fifth connecting rod, 20 - sixth connecting rod, 21 - third driven rod, 22 - fourth driven rod, 23 - second fixed end. Specific Embodiments

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the content of the present invention is not limited to the scope described.

[0014] Embodiment 1: As Figures 1-4 shown, a screw-driven scissor-type telescopic mechanism includes a power device 1 and a transmission mechanism 2.

[0015] Exemplarily, the power device 1 in the figure includes a servo motor 3, a first fixed end 4, a screw 5, and a threaded flange 6; wherein, the servo motor 3 is fixedly connected inside the first fixed end 4 by bolts, the output shaft end of the servo motor 3 is fixed to the screw 5, and the threaded flange 6 is installed on the screw 5 to form a screw pair.

[0016] Further, the transmission mechanism 2 includes a first support block 7, a first connecting rod 8, a second connecting rod 9, a first driven rod 10, a second driven rod 11, a first support column 12, a gasket 13, a third connecting rod 14, a fourth connecting rod 15, a second support block 16, a second support column 17, a third support block 18, a fifth connecting rod 19, a sixth connecting rod 20, a third driven rod 21, a fourth driven rod 22, and a second fixed end 23. Among them, the first support block 7 is fixedly connected to the threaded flange 6 in the power device 1 by bolts. The first support block 7 is connected to the middle parts of the first connecting rod 8 and the second connecting rod 9 by pins to form a rotating pair. One end of the first connecting rod 8 is connected to the toothless end of the first driven rod 10, the first support column 12, and the gasket 13 by pins to form a rotating pair. The other end of the first connecting rod 8 is connected to the fourth connecting rod 15 and the second support column 17 by pins to form a rotating pair. One end of the second connecting rod 9 is connected to the toothless end of the second driven rod 11 and the first support column 12 by pins to form a rotating pair. The other end of the second connecting rod 9 is connected to the third connecting rod 14 and the second support column 17 by pins to form a rotating pair. The toothed end of the first driven rod 10 meshes with the toothed end of the second driven rod 11 and is fixed to the first fixed end 4 by a pin. The second support block 16 is connected to the middle parts of the third connecting rod 14 and the fourth connecting rod 15 by pins to form a rotating pair. The third support block 18 is connected to the middle parts of the fifth connecting rod 19 and the sixth connecting rod 20 by pins to form a rotating pair. One end of the fifth connecting rod 19 is connected to the fourth connecting rod 15 and the second support column 17 by pins to form a rotating pair. The other end of the fifth connecting rod 19 is connected to the toothless end of the fourth driven rod 22 by pins to form a rotating pair. One end of the sixth connecting rod 20 is connected to the third connecting rod 14 and the second support column 17 by pins to form a rotating pair. The other end of the sixth connecting rod 20 is connected to the toothless end of the third driven rod 21 by pins to form a rotating pair. The toothed end of the third driven rod 21 meshes with the toothed end of the fourth driven rod 22 and is fixed to the second fixed end 23 by a pin.

[0017] The working principle of the present invention is as follows: The servo motor 3 drives the screw rod 5 fixed at the output shaft end to rotate, thereby causing the threaded flange 6 forming a screw pair with the screw rod 5 to move, and further causing the first support block 7 fixed to the threaded flange 6 to move, thereby extending or shortening the scissor-type telescopic mechanism.

[0018] The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A screw-driven scissor-type telescopic mechanism, characterized in that, It includes a power unit (1) and a transmission mechanism (2).

2. The screw-driven scissor-type telescopic mechanism according to claim 1, wherein, The power unit (1) includes a servo motor (3), a first fixed end (4), a screw (5) and a threaded flange (6); wherein, the servo motor (3) is fixedly connected inside the first fixed end (4) by bolts, the output shaft end of the servo motor (3) is fixedly connected to the screw (5), and the threaded flange (6) is installed on the screw (5) to form a screw pair.

3. A screw-driven scissor-type telescopic mechanism according to claim 1, characterized in that, The transmission mechanism (2) includes a first support block (7), a first connecting rod (8), a second connecting rod (9), a first driven rod (10), a second driven rod (11), a first support column (12), a gasket (13), a third connecting rod (14), a fourth connecting rod (15), a second support block (16), a second support column (17), a third support block (18), a fifth connecting rod (19), a sixth connecting rod (20), a third driven rod (21), a fourth driven rod (22) and a second fixed end (23); wherein, the first support block (7) is fixedly connected to the threaded flange (6) in the power unit (1) by bolts, and the first support block (7) is connected to the middle parts of the first connecting rod (8) and the second connecting rod (9) by pins to form a rotating pair; one end of the first connecting rod (8) is connected to the toothless end of the first driven rod (10), the first support column (12) and the gasket (13) by pins to form a rotating pair, and the other end of the first connecting rod (8) is connected to the fourth connecting rod (15) and the second support column (17) by pins to form a rotating pair; one end of the second connecting rod (9) is connected to the toothless end of the second driven rod (11) and the first support column (12) by pins to form a rotating pair, and the other end of the second connecting rod (9) is connected to the third connecting rod (14) and the second support column (17) by pins to form a rotating pair; the toothed end of the first driven rod (10) meshes with the toothed end of the second driven rod (11) and is fixed on the first fixed end (4) by a pin; the second support block (16) is connected to the middle parts of the third connecting rod (14) and the fourth connecting rod (15) by pins to form a rotating pair, and the third support block (18) is connected to the middle parts of the fifth connecting rod (19) and the sixth connecting rod (20) by pins to form a rotating pair; one end of the fifth connecting rod (19) is connected to the fourth connecting rod (15) and the second support column (17) by pins to form a rotating pair, and the other end of the fifth connecting rod (19) is connected to the toothless end of the fourth driven rod (22) by pins to form a rotating pair; one end of the sixth connecting rod (20) is connected to the third connecting rod (14) and the second support column (17) by pins to form a rotating pair, and the other end of the sixth connecting rod (20) is connected to the toothless end of the third driven rod (21) by pins to form a rotating pair; the toothed end of the third driven rod (21) meshes with the toothed end of the fourth driven rod (22) and is fixed on the second fixed end (23) by a pin.

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