Bird rescue device capable of cooling by spraying

Abstract

The invention discloses a bird rescue device capable of spraying and cooling, and relates to the technical field of animal rescue, the device comprises a support mechanism and a lifting mechanism movably mounted on the support mechanism; the supporting mechanism comprises a base and side stand columns symmetrically fixed to the base. The lifting mechanism comprises a movable stand column movably arranged on the side stand columns in a sleeving mode, a water tank installed on the outer side wall of the movable stand column, a bearing assembly installed on the outer wall of the front side of the movable stand column, a corrugated water pipe installed in the bearing assembly and an atomization head installed at the outer end of the corrugated water pipe. The inner end of the corrugated water pipe communicates with the water tank. The water tank is connected with the corrugated water pipe, and water can be atomized and sprayed out under the action of the atomizing head, so that the cooling purpose is achieved; the supporting mechanism is matched with the lifting mechanism, so that the spraying height can be adjusted, the appropriate spraying height can play a rapid cooling role, non-contact operation can be achieved, direct conflicts between people and birds are reduced, and the stress risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of animal rescue, and particularly to a bird rescue device capable of spraying and cooling. Background Art

[0002] In a high-temperature environment in summer, the unique physiological structure of birds makes them extremely sensitive to high temperatures and have low high-temperature tolerance; because birds have feathers, and the heat preservation of feathers becomes a burden under high temperatures. When the environmental temperature exceeds their heat dissipation capacity, they are extremely prone to heat stroke, manifested as rapid breathing, drooping wings, coma or even death; moreover, birds lack sweat glands and cannot dissipate heat through sweating. They mainly rely on panting to evaporate the moisture in the oral cavity and stretching their wings to expose the skin blood vessels to cool down. If trapped in an enclosed space (such as the gap between glass curtain walls) or exhausted, these mechanisms will fail and easily lead to death. In order to reduce the harm of high temperatures to birds, animal rescue personnel usually use physical cooling methods or environmental cooling methods to rescue birds in high-temperature environments. Although these methods have certain effects, they all have great limitations; when using physical cooling methods, close-range operation is required, which not only exacerbates the stress response of birds but also is difficult to implement in a narrow space (such as building gaps); when using environmental cooling methods, air conditioners or fans are needed. However, these devices are bulky and cannot be quickly deployed in outdoor or high-altitude rescue scenarios, and the noise generated by the devices may startle the birds and cause secondary injuries.

[0003] In view of the above deficiencies, animal rescue personnel have found in their research that the spray cooling system for agriculture can generate water mist through high-pressure nozzles to quickly cool livestock and poultry houses; the cooling spray equipment for fire fighting can use high-pressure water mist to quickly extinguish flames and reduce the environmental temperature; thus, it can be seen that using a spray cooling device can achieve remote spraying and at the same time achieve the purpose of rapid cooling to make up for the deficiencies in the prior art.

[0004] Moreover, a patent with the application number CN201910486383.0 discloses: a spray cooling device for animal breeding, including a mobile base, a water storage tank arranged on the mobile base, a lifting water supply mechanism arranged on the mobile base and communicated with the water storage tank, a spray mechanism arranged on the top of the lifting water supply mechanism, and an electric control mechanism, and the electric control mechanism is electrically connected to the spray mechanism and the lifting water supply mechanism respectively. Compared with the prior art, through the cooperation of the mobile base, the water storage tank, the lifting water supply mechanism, the spray mechanism and the electric control mechanism, the present invention can move the device to the vicinity of the pigs in the pigsty and directly atomize and spray the water to the pig's head, thereby enabling the pigs to achieve more direct and effective rapid cooling, avoiding the pigs from getting sick, ensuring the healthy growth of the pigs, and reducing the breeding cost.

[0005] Although the above device can achieve the purpose of spray cooling, this device can only be used for spray cooling work in animal breeding and is not suitable for bird rescue; since birds have the ability to fly, they all move in a relatively high area, so the spray cooling device needs to have the ability to spray and cool at high altitudes. However, due to the limitation of the corrugated pipe, the above device has a limited rising height and cannot be used for spray cooling work at high altitudes; therefore, it is necessary to design a spray cooling device with a height adjustment function for high-temperature rescue work of birds. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a bird rescue device capable of spray cooling, aiming to solve the problems existing in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solution: A bird rescue device capable of spray cooling, including a support mechanism, and further including a lifting mechanism movably installed on the support mechanism;

[0008] The support mechanism includes a base, a plurality of pulleys symmetrically installed on the bottom of the base, side columns symmetrically fixed on the base, and an upper connecting plate connected between the upper ends of the side columns;

[0009] The lifting mechanism includes a movable column movably sleeved on the side column, a lower connecting plate connected between the lower ends of the movable column, inner through grooves symmetrically opened on the inner side wall of the movable column, water tanks symmetrically installed on the outer side wall of the movable column, a bearing assembly symmetrically installed on the front outer wall of the movable column, a corrugated water pipe installed in the bearing assembly, and an atomizing head installed on the outer end of the corrugated water pipe. The inner end of the corrugated water pipe is also communicated with the water tank, and a water pump is installed between the water tank and the corrugated water pipe. The two ends of the upper connecting plate are movably clamped in the inner through grooves. The corrugated water pipe used is telescopic, and by connecting the corrugated water pipe with the water tank, under the drive of the water pump and the action of the atomizing head, water can be atomized and sprayed to achieve the purpose of cooling.

[0010] Further, the support mechanism further includes a bottom groove opened at the center of the base, a driving gear rotatably installed at the center of the bottom groove, follower gears symmetrically and rotatably installed in the bottom groove, threaded rods upwardly connected to the center positions of the follower gears, and a first motor installed on the bottom of the base. The follower gears are located on both sides of the driving gear and are respectively meshed with the driving gear, and the first motor is connected to the driving gear.

[0011] Further, threaded openings are symmetrically opened on the lower connecting plate, and the threaded rods are threadedly passed through the threaded openings and the upper ends of the threaded rods are rotatably installed on the upper connecting plate.

[0012] Further, the bearing assembly includes an inner bearing groove symmetrically fixed on the front outer wall of the movable column, and an outer bearing groove rotatably installed in front of the inner bearing groove. A telescopic assembly is also installed between the outer bearing groove and the movable column. The corrugated water pipe is installed in the inner bearing groove and the outer bearing groove. The openings of the inner bearing groove and the outer bearing groove face outward, and baffles are equidistantly installed at the openings. The multiple baffles can limit the corrugated water pipe to prevent it from falling off.

[0013] Further, an inner clamping block is installed at the front side position of the upper end of the back of the inner bearing groove, a positioning groove is provided at the front side position of the center of the back of the outer bearing groove, and an outer clamping block is installed at the rear side position of the upper end of the back of the outer bearing groove. The position of the outer clamping block corresponds to that of the inner clamping block, and the outer clamping block is rotatably clamped on the inner clamping block.

[0014] Further, the telescopic assembly includes a lead screw module installed on the front outer wall of the movable column, a second motor connected to the end of the lead screw module, a displacement block movably sleeved on the lead screw module, and a driving rod rotatably installed on the displacement block. The other end of the driving rod is rotatably installed in the positioning groove.

[0015] Further, the lifting mechanism further includes a swing assembly movably installed on the front outer wall of the outer bearing groove and a power assembly installed on the upper end of the inner bearing groove.

[0016] Further, the swing assembly includes a rotating shaft rotatably installed at the lower position of the front outer wall of the outer bearing groove, a follower rod longitudinally connected to the rotating shaft, a transfer rod horizontally connected to the rotating shaft, a linkage rod rotatably connected to the free end of the transfer rod, and a follower spur gear rotatably installed at the upper position of the front outer wall of the outer bearing groove. The free end of the follower rod is connected to the atomizing head, and the upper end of the linkage rod is rotatably installed at the eccentric position of the follower spur gear.

[0017] Further, the power assembly includes a driving spur gear rotatably installed on the upper end of the inner bearing groove and a third motor installed on the movable column. The third motor is connected to the driving spur gear. When the outer bearing groove rotates to be perpendicular to the inner bearing groove, the driving spur gear meshes with the follower spur gear.

[0018] Compared with the prior art, the present invention provides a bird rescue device capable of spray cooling, having the following beneficial effects:

[0019] 1. The device of this application has a lifting function and can be used for high-altitude spray cooling work. The first motor is used to drive the driving gear to rotate. The rotating driving gear drives the threaded rod to rotate synchronously through the follower gear. Under the limiting action of the threaded port, the lifting mechanism moves upward, thereby driving the atomizing head to move upward. Rescue personnel can adjust the height of the device according to the height area of bird rescue. The appropriate spray height can play a role in quickly cooling down and seize the golden time for rescue. At the same time, the appropriate spray height can also achieve non-contact operation, reduce the direct conflict between humans and birds, and reduce the stress risk.

[0020] 2. The bearing assembly in the device of this application is designed to be expandable. The second motor is used to drive the displacement block to displace. Under the common limiting action of the driving rod and the inner clamping block, the outer bearing groove rotates around the inner clamping block to a state perpendicular to the inner bearing groove. The expanded bearing assembly cooperates with the movable support mechanism, enabling the device to be applicable to the cooling rescue work in complex spaces that are difficult for humans to access, thereby meeting the rescue needs in different environments. Moreover, after the device is used, the outer bearing groove can be rotated and folded back by the second motor, which is convenient for the device to be stored and transported.

[0021] 3. The device of this application can also expand the spray cooling range as needed. When a large area needs spray cooling, the spray range can be expanded by driving the atomizing head to swing reciprocally. When driving, the third motor is started to drive the driving pointed gear to rotate. The follower pointed gear rotates accordingly and drives one end of the linkage rod to make a circular motion. While the linkage rod is moving, the other end drives the transfer rod to swing reciprocally along the rotating shaft. The follower rod also swings reciprocally along the rotating shaft. The atomizing head swings synchronously with the follower rod. The continuously swinging atomizing head can expand the spray range and improve the effect. Description of the Drawings

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the overall structural schematic diagram of the present invention in another direction;

[0024] Figure 3 is Figure 2 the enlarged view of part A in

[0025] Figure 4 is the partial cross-sectional view of the support mechanism of the present invention;

[0026] Figure 5 is the structural schematic diagram of the lifting mechanism of the present invention;

[0027] Figure 6 is Figure 5 the enlarged schematic view of part B in

[0028] Figure 7 isFigure 5 Schematic enlarged view of part C;

[0029] Figure 8 For Figure 5 Schematic enlarged view of part D;

[0030] Figure 9 Side view schematic of the lifting mechanism of the present invention;

[0031] Figure 10 Structural schematic of the lifting mechanism of the present invention when unfolded;

[0032] Figure 11 For Figure 10 Schematic enlarged view of part E;

[0033] Figure 12 Side view schematic of the lifting mechanism of the present invention when unfolded.

[0034] In the figure: 1, support mechanism; 11, pulley; 12, base; 121, bottom groove; 13, threaded rod; 14, side column; 15, driving gear; 16, first motor; 17, upper connecting plate; 18, follower gear; 2, lifting mechanism; 21, movable column; 211, inner through groove; 22, lower connecting plate; 23, threaded port; 24, water tank; 241, water pump; 25, bearing assembly; 251, inner bearing groove; 2511, inner clamping block; 252, outer bearing groove; 2521, positioning groove; 2522, outer clamping block; 253, baffle; 26, corrugated water pipe; 261, atomizing head; 27, telescopic assembly; 271, lead screw module; 272, second motor; 273, displacement block; 274, driving rod; 28, swinging assembly; 281, follower rod; 282, rotating shaft; 283, intermediate rod; 284, linkage rod; 285, follower pointed gear; 29, power assembly; 291, driving pointed gear; 292, third motor. Detailed implementation manners

[0035] In the present invention, unless otherwise stated, the directions such as "up, down" are generally in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are generally the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contour of each component itself, but the above direction terms are not used to limit the present invention.

[0036] Please refer to Figures 1 to 12 , the present invention provides a technical solution for a bird rescue device capable of spray cooling:

[0037] A bird rescue device capable of spray cooling, comprising a support mechanism 1, and further comprising a lifting mechanism 2 movably mounted on the support mechanism 1; the support mechanism 1 includes a base 12, a plurality of pulleys 11 symmetrically mounted on the bottom of the base 12, side columns 14 symmetrically fixed on the base 12, and an upper connecting plate 17 connected between the upper ends of the side columns 14; the lifting mechanism 2 includes a movable column 21 movably sleeved on the side column 14, a lower connecting plate 22 connected between the lower ends of the movable column 21, inner through grooves 211 symmetrically opened on the inner side wall of the movable column 21, water tanks 24 symmetrically mounted on the outer side wall of the movable column 21, a bearing assembly 25 symmetrically mounted on the front outer wall of the movable column 21, a corrugated water pipe 26 mounted in the bearing assembly 25, and an atomizing head 261 mounted on the outer end of the corrugated water pipe 26. The inner end of the corrugated water pipe 26 is also communicated with the water tank 24. A water pump 241 is also installed between the water tank 24 and the corrugated water pipe 26. The two ends of the upper connecting plate 17 are movably clamped in the inner through grooves 211. The corrugated water pipe 26 adopted is telescopic, and by connecting the corrugated water pipe 26 with the water tank 24, under the drive of the water pump 241 and the action of the atomizing head 261, water can be atomized and sprayed to achieve the purpose of cooling.

[0038] The support mechanism 1 further includes a bottom groove 121 opened at the center of the base 12, a driving gear 15 rotatably installed at the center of the bottom groove 121, follower gears 18 symmetrically and rotatably installed in the bottom groove 121, threaded rods 13 upwardly connected to the centers of the follower gears 18, and a first motor 16 installed on the bottom of the base 12. The follower gears 18 are located on both sides of the driving gear 15 and respectively mesh with the driving gear 15. The first motor 16 is connected to the driving gear 15. Threaded openings 23 are also symmetrically opened on the lower connecting plate 22. The threaded rods 13 are threadedly inserted through the threaded openings 23, and the upper ends of the threaded rods 13 are rotatably installed on the upper connecting plate 17.

[0039] The bearing assembly 25 includes an inner bearing groove 251 symmetrically fixed on the front outer wall of the movable column 21, and an outer bearing groove 252 rotatably installed in front of the inner bearing groove 251. A telescopic assembly 27 is also installed between the outer bearing groove 252 and the movable column 21. The corrugated water pipe 26 is installed in the inner bearing groove 251 and the outer bearing groove 252. The openings of the inner bearing groove 251 and the outer bearing groove 252 face outward, and baffles 253 are equally spaced at the openings. The multiple baffles 253 can limit the corrugated water pipe 26 to prevent it from falling. An inner clamping block 2511 is also installed at the front side position of the upper end of the back of the inner bearing groove 251, a positioning groove 2521 is provided at the front side position of the center of the back of the outer bearing groove 252, and an outer clamping block 2522 is installed at the rear side position of the upper end of the back of the outer bearing groove 252. The position of the outer clamping block 2522 corresponds to that of the inner clamping block 2511, and the outer clamping block 2522 is rotatably clamped on the inner clamping block 2511.

[0040] The telescopic assembly 27 includes a lead screw module 271 installed on the front outer wall of the movable column 21, a second motor 272 connected to the end of the lead screw module 271, a displacement block 273 movably sleeved on the lead screw module 271, and a driving rod 274 rotatably installed on the displacement block 273. The other end of the driving rod 274 is rotatably installed in the positioning groove 2521.

[0041] The lifting mechanism 2 further includes a swinging assembly 28 movably installed on the front outer wall of the outer bearing groove 252 and a power assembly 29 installed on the upper end of the inner bearing groove 251. The swinging assembly 28 includes a rotating shaft 282 rotatably installed at the lower position of the front outer wall of the outer bearing groove 252, a follower rod 281 longitudinally connected to the rotating shaft 282, a transfer rod 283 horizontally connected to the rotating shaft 282, a linkage rod 284 rotatably connected to the free end of the transfer rod 283, and a follower spur gear 285 rotatably installed at the upper position of the front outer wall of the outer bearing groove 252. The free end of the follower rod 281 is connected to the atomizing head 261, and the upper end of the linkage rod 284 is rotatably installed at the eccentric position of the follower spur gear 285. The power assembly 29 includes a driving spur gear 291 rotatably installed on the upper end of the inner bearing groove 251 and a third motor 292 installed on the movable column 21. The third motor 292 is connected to the driving spur gear 291. When the outer bearing groove 252 rotates to be perpendicular to the inner bearing groove 251, the driving spur gear 291 meshes with the follower spur gear 285.

[0042] Working principle: In actual use, as a bird rescue device capable of spray cooling, when spray cooling is required, first move the device to the vicinity of the area where cooling and rescue are needed through the pulley 11, and then adjust the height of the device according to the height of the birds to be rescued. During the adjustment, start the first motor 16, the first motor 16 drives the driving gear 15 to rotate, the driving gear 15 drives the follower gears 18 on both sides to rotate synchronously, the follower gears 18 drive the threaded rods 13 to rotate synchronously, and under the limitation of the threaded opening 23, the threaded rods 13 drive the lower connecting plate 22 to move upward, so as to drive the lifting mechanism 2 to move upward. When the upper end of the movable column 21 rises to the height where spray cooling can be carried out, turn off the first motor 16 to stop the upward movement of the movable column 21. Then start the second motor 272 to deploy the corrugated water pipe 26. The second motor 272 drives the displacement block 273 to move upward, the driving rod 274 rotates accordingly, and under the limitation of the positioning groove 2521, drives the outer bearing groove 252 to rotate around the inner clamping block 2511 until the outer bearing groove 252 rotates to a horizontal state. Turn off the second motor 272. At this time, the inner bearing groove 251 and the outer bearing groove 252 are perpendicular to each other, and the follower pointed gear 285 is still meshed with the driving pointed gear 291. Then use the pulley 11 to move the atomizing head 261 above the area to be spray-rescued, and then start the water pump 241 to carry out spray cooling. The water pump 241 drives the water in the water tank 24 into the corrugated water pipe 26, and then forms water mist with smaller particle size through the atomizing head 261. The water mist can achieve rapid cooling through evaporative cooling, seize the golden time for rescue. At the same time, long-distance spraying can achieve non-contact operation, reduce the direct conflict between humans and birds, and reduce the stress risk. Since the spraying range of the fixed atomizing head 261 is limited, when large-scale cooling is required, the device of the present application uses the swing assembly 28 and the power assembly 29 to drive the atomizing head 261 to rotate, so as to expand the spraying range. During the driving, first start the third motor 292, the third motor 292 drives the driving pointed gear 291 to rotate, the driving pointed gear 291 drives the engaged follower pointed gear 285 to rotate, the follower pointed gear 285 drives one end of the linkage rod 284 to perform a circular motion. While the linkage rod 284 is moving, the other end thereof drives the intermediate rod 283 to swing reciprocally around the rotating shaft 282. The rotating shaft 282 rotates reciprocally and drives the follower rod 281 to swing reciprocally. The follower rod 281 drives the atomizing head 261 to swing reciprocally. The reciprocal swing of the atomizing head 261 can expand the spraying range, making the cooling faster and the cooling effect better. In the device of the present application, the telescopic design of the corrugated water pipe 26 can make it unaffected by the back-and-forth rotation of the outer bearing groove 252, ensure the smooth flow of water, and thus ensure the quality of spray cooling.

[0043] In addition, in the device of the present application, the working principles and remote controls of the first motor 16, the second motor 272, the water pump 241 and the third motor 292 adopted are all prior arts, and the specific principles will not be elaborated in this technical solution.

[0044] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A bird rescue device capable of spraying and cooling, comprising a support mechanism (1), characterized in that: It also includes a lifting mechanism (2) movably mounted on the supporting mechanism (1); The support mechanism (1) comprises a base (12), a plurality of pulleys (11) symmetrically mounted on the bottom of the base (12), side columns (14) symmetrically fixed on the base (12), and an upper connecting plate (17) connected between the upper ends of the side columns (14); The lifting mechanism (2) comprises a movable column (21) movably sleeved on a side column (14), a lower connecting plate (22) connected between the lower ends of the movable column (21), an inner through groove (211) symmetrically arranged on the inner side wall of the movable column (21), a water tank (24) symmetrically mounted on the outer side wall of the movable column (21), a bearing assembly (25) symmetrically mounted on the front outer wall of the movable column (21), a corrugated water pipe (26) mounted in the bearing assembly (25), and an atomizing head (261) mounted on the outer end of the corrugated water pipe (26), the inner end of the corrugated water pipe (26) is also connected to the water tank (24), and a water pump (241) is also installed between the water tank (24) and the corrugated water pipe (26), and both ends of the upper connecting plate (17) are movably clamped in the inner through groove (211).

2. The bird rescue device capable of spraying and cooling according to claim 1, characterized in that: The support mechanism (1) further comprises a bottom groove (121) provided at the center position of the base (12), a driving gear (15) rotatably mounted at the center position of the bottom groove (121), a follower gear (18) symmetrically and rotatably mounted in the bottom groove (121), a threaded rod (13) connected upwardly at the center position of the follower gear (18), and a first motor (16) mounted at the bottom of the base (12), wherein the follower gear (18) is located at both sides of the driving gear (15) and meshes with the driving gear (15) respectively, and the first motor (16) is connected to the driving gear (15).

3. The bird rescue device capable of spraying and cooling according to claim 2, characterized in that: The lower connecting plate (22) is also symmetrically provided with threaded openings (23), the threaded rod (13) is threadedly inserted into the threaded openings (23), and the upper end of the threaded rod (13) is rotatably mounted on the upper connecting plate (17).

4. The bird rescue device capable of spraying and cooling according to claim 1, characterized in that: The bearing assembly (25) comprises an inner bearing groove (251) symmetrically fixed on the outer wall of the front side of the movable column (21), and an outer bearing groove (252) rotatably installed on the front side of the inner bearing groove (251); a telescopic assembly (27) is also installed between the outer bearing groove (252) and the movable column (21); the corrugated water pipe (26) is installed in the inner bearing groove (251) and the outer bearing groove (252); the openings of the inner bearing groove (251) and the outer bearing groove (252) are both outwardly facing, and baffles (253) are also installed at equal distances at the openings.

5. The bird rescue device capable of spraying and cooling according to claim 4, characterized in that: An inner clamping block (2511) is also installed at the front side of the upper end of the back of the inner bearing groove (251), a positioning groove (2521) is provided at the front side of the center of the back of the outer bearing groove (252), and an outer clamping block (2522) is also installed at the rear side of the upper end of the back of the outer bearing groove (252), the outer clamping block (2522) corresponds to the position of the inner clamping block (2511) and the outer clamping block (2522) is rotatably clamped on the inner clamping block (2511).

6. The bird rescue device capable of spraying and cooling according to claim 5, characterized in that: The telescopic assembly (27) comprises a screw module (271) mounted on the front outer wall of the movable column (21), a second motor (272) connected to the end of the screw module (271), a displacement block (273) movably sleeved on the screw module (271), and a driving rod (274) rotatably mounted on the displacement block (273), and the other end of the driving rod (274) is rotatably mounted in the positioning groove (2521).

7. The bird rescue device capable of spraying and cooling according to claim 4, characterized in that: The lifting mechanism (2) further comprises a swing assembly (28) movably mounted on the front outer wall of the outer bearing groove (252) and a power assembly (29) mounted on the upper end of the inner bearing groove (251).

8. The bird rescue device capable of spraying and cooling according to claim 7, characterized in that: The swing assembly (28) comprises a rotating shaft (282) rotatably mounted on the lower section of the outer wall on the front side of the outer bearing groove (252), a follower rod (281) longitudinally connected to the rotating shaft (282), a transfer rod (283) transversely connected to the rotating shaft (282), a linkage rod (284) rotatably connected to the free end of the transfer rod (283), and a follower sharp gear (285) rotatably mounted on the upper section of the outer wall on the front side of the outer bearing groove (252), the free end of the follower rod (281) is connected to the atomizing head (261), and the upper end of the linkage rod (284) is rotatably mounted on the eccentric position of the follower sharp gear (285).

9. The bird rescue device capable of spraying and cooling according to claim 8, characterized in that: The power assembly (29) comprises a driving sharp gear (291) rotatably mounted on the upper end of the inner bearing groove (251) and a third motor (292) mounted on the movable column (21); the third motor (292) is connected to the driving sharp gear (291); when the outer bearing groove (252) rotates to be perpendicular to the inner bearing groove (251), the driving sharp gear (291) meshes with the follower sharp gear (285).

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