WO2019218499A1 - 一种传动装置和升降立柱 - Google Patents

一种传动装置和升降立柱 Download PDF

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Publication number
WO2019218499A1
WO2019218499A1 PCT/CN2018/099510 CN2018099510W WO2019218499A1 WO 2019218499 A1 WO2019218499 A1 WO 2019218499A1 CN 2018099510 W CN2018099510 W CN 2018099510W WO 2019218499 A1 WO2019218499 A1 WO 2019218499A1
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WIPO (PCT)
Prior art keywords
transmission
sleeve
torsion spring
hollow shaft
nut
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PCT/CN2018/099510
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English (en)
French (fr)
Inventor
胡仁昌
陆小健
黄占辉
张东行
Original Assignee
浙江捷昌线性驱动科技股份有限公司
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Application filed by 浙江捷昌线性驱动科技股份有限公司 filed Critical 浙江捷昌线性驱动科技股份有限公司
Publication of WO2019218499A1 publication Critical patent/WO2019218499A1/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F13/00Common constructional features or accessories

Definitions

  • the invention belongs to the field of transmission devices, in particular to a transmission device and a lifting column.
  • the electric lifting column is widely used in the fields of home and medical.
  • the tube body of the existing electric lifting column generally includes an inner tube, a middle tube, an outer tube, and a bottom shell fixedly connected with the upper end of the inner tube.
  • a transmission nut is respectively disposed on the inner tube and the middle tube to cooperate with the transmission screw and the hollow screw, thereby achieving relative expansion and contraction of the inner tube, the middle tube and the outer tube.
  • the Chinese invention patent CN207016433U discloses "a retractable transmission assembly device and a lifting column", wherein the cooperation and connection manner of the transmission screw and the hollow screw are disclosed in detail, but the transmission assembly device and the lifting column are also currently used.
  • the technical problem to be solved by the present invention is to provide a transmission device and a lifting column, which can effectively improve the self-locking force of the transmission device, and the transmission is more stable.
  • a transmission device includes a middle hollow shaft, wherein a middle transmission shaft is provided with a transmission screw, and the transmission screw and the middle hollow shaft are synchronously rotated in a circumferential direction and axially slidably engaged, and the middle hollow shaft outer wall
  • An external thread is provided and threaded with a first transmission nut, and the middle hollow shaft is connected with a first sleeve through a first transmission nut, the transmission screw is threaded with a second transmission nut and a second sleeve is connected through the second transmission nut a second transmission nut that is axially fixed and circumferentially oppositely rotated with respect to the hollow shaft, the transmission including a first brake torsion spring that brakes the drive screw, and a brake that centers the hollow shaft Two brake torsion springs.
  • a brake torsion spring is arranged on the transmission screw.
  • the brake torsion spring will hold the transmission.
  • the screw achieves the braking effect, but the self-locking force that a brake torsion spring can provide is limited. Therefore, in the present invention, an additional brake torsion spring is added to the transmission device, and the double torsion spring brake is used to enhance the system. Dynamic effect
  • a single brake torsion spring in the realization of the braking effect, only a part of the drive screw is braked, but the drive screw, the hollow shaft itself is a slender structural component, if only a single position on a certain position Moving, away from this position, there will be a certain degree of shaking, similar to the bicycle's front brake braking force is too large, the bicycle will be moved in the same way at the back, so a single brake torsion spring brake, in the brake The stability is not good, and the double torsion spring brake can achieve braking to different parts to a certain extent, the braking effect is better and smoother, and the swaying degree of the transmission device is reduced;
  • the hollow shaft is short-time. There is no braking force inside, and it is impossible to avoid mutual movement between the two.
  • a brake torsion spring is provided for the drive screw
  • a brake torsion spring is also provided for the center hollow shaft, which is equivalent to the two single components being subjected to the braking force at the same time, wherein the hollow shaft and the transmission screw are switched from forward to reverse, Each component will be subjected to braking force, which is equivalent to synchronous braking between the two, so the transmission between the two is more synchronized, the probability of relative motion becomes smaller, the stability is better, and the overall transmission can be extended. life.
  • the second brake torsion spring is sleeved on the hollow shaft.
  • the second torsion spring comprises a second torsion spring body and a second torsion spring pin, the second torsion spring body being sleeved outside the hollow shaft, the second torsion spring pin and the The second sleeve remains relatively fixed in the circumferential direction.
  • the inner wall of the second sleeve is provided with a positioning groove, and the second torsion spring pin is fitted in the positioning groove.
  • the positioning groove extends to the top of the second sleeve.
  • a second bushing is disposed between the second brake torsion spring and the middle hollow shaft, and the second bushing and the middle hollow shaft are circumferentially fixed, and the second brake torsion spring set is On the second bushing.
  • the second sleeve is sleeved outside the first sleeve, and the second brake torsion spring is located between the first transmission nut and the second transmission nut.
  • the transmission screw is mounted on a fixing plate
  • the first torsion spring comprises a first torsion spring body and a first torsion spring pin
  • the first torsion spring body is sleeved outside the transmission screw
  • the first torsion spring pin is positioned on the fixed plate.
  • the driving screw has a driving end, the driving end is a non-cylindrical structure, and the middle hollow shaft has a non-circular inner hole, and the non-cylindrical structure is matched with the non-circular inner hole to transmit the driving force to the transmission screw to the middle Hollow shaft.
  • the upper end of the middle hollow shaft is fixedly fitted with a first bearing, and the first bearing is fixedly mounted on the second transmission nut.
  • the first sleeve and the second sleeve are both non-circular tubes, the first transmission nut is engaged with the upper end of the first sleeve, and the second transmission nut is engaged with the second sleeve. Upper end.
  • the present invention also discloses a lifting column, which comprises an inner tube, a middle tube, an outer tube, a bottom shell fixedly connected to the upper end of the inner tube, a driving device disposed in the bottom housing, and a driving device.
  • a transmission-equipped transmission device wherein the transmission device is the transmission device according to any one of the above aspects, wherein the driving device is coupled with a transmission screw, and a lower end of the outer tube is provided with a bottom plate, and a lower end of the first sleeve Resisting the bottom plate, the second sleeve drives the middle tube to rise and fall.
  • FIG. 1 is a schematic exploded view of a transmission device according to a first embodiment of the present invention
  • FIG. 2 is a partial structural schematic view of a transmission device according to Embodiment 1 of the present invention.
  • FIG. 3 is a partial internal structural view of a transmission device according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic view showing the internal structure of a transmission device according to Embodiment 1 of the present invention.
  • Figure 5 is a schematic exploded view of the lifting column in the second embodiment of the present invention.
  • Figure 6 is a cross-sectional view of the lifting column in the second embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a transmission device includes a hollow shaft 1, a transmission screw 2, a first sleeve 3 and a second sleeve 4.
  • the outer wall of the hollow shaft 1 is provided with an external thread 11, and the transmission screw 2 is located.
  • the driving screw 2 has a driving end, the driving end is a non-cylindrical structure, and the hollow shaft 1 has a non-circular inner hole, and the non-cylindrical structure is matched with the non-circular inner hole so that the driving screw 2 transmits the driving force to
  • the hollow shaft 1 thus drives the central hollow shaft 1 to rotate synchronously.
  • the first transmission nut 31 is fixedly connected to the upper portion of the first sleeve 3.
  • the external thread 11 on the hollow shaft 1 is threadedly engaged with the first transmission nut 31, and the second sleeve 4 is fitted outside the first sleeve 3.
  • the second sleeve 4 is fixedly coupled to the second transmission nut 41.
  • the transmission screw 2 is threadedly engaged with the second transmission nut 41.
  • the connection relationship between the hollow shaft 1 and the second transmission nut 41 is:
  • the second transmission nut 41 is axially positionable in a rotatable manner, that is to say that the hollow shaft 1 can be rotated relative to the second transmission nut 41 but not axially relative to the second transmission nut 41.
  • the transmission in order to increase the self-locking force of the entire transmission, the transmission includes a first brake torsion spring 26 that brakes the drive screw 2, and a second brake torsion spring 14 that brakes the center hollow shaft 1. .
  • a brake torsion spring is arranged on the transmission screw 2.
  • the brake torsion spring will hold The tightening drive screw 2 achieves the braking action, but the self-locking force that a brake torsion spring can provide is limited.
  • an additional brake torsion spring is added to the transmission device, and the double torsion spring is used for braking. To improve the braking effect;
  • the single brake torsion spring only brakes a part of the position of the transmission screw 2 when the braking effect is achieved.
  • the transmission screw 2 and the hollow shaft 1 itself are components of an elongated structure, if only a certain One position brakes, and a certain degree of sway occurs when the position is far away from the position. Similar to the bicycle's front brake, the brake force is too large, the bicycle will be swayed at the rear, so the single brake torsion spring brakes.
  • the stability is not good during braking, and the double torsion spring brake can achieve braking to different positions to a certain extent, the braking effect is better and smoother, and the swaying degree of the transmission device is reduced;
  • the power transmission of the transmission device, the transmission screw 2 drives the second sleeve 4 to lift and lower by the second transmission nut 41, and the middle hollow shaft 1 drives the first sleeve 3 to lift and lower by the first transmission nut 31, and the second transmission nut 41 and the middle
  • the hollow shaft 1 is axially fixed and circumferentially oppositely rotated.
  • the centering hollow shaft 1 is also provided with a brake torsion spring, which is equivalent to the two single components being subjected to the braking force at the same time, wherein the hollow shaft 1 and the transmission screw 2 are switched from forward to reverse.
  • braking force which is equivalent to synchronous braking between the two, so the transmission between the two is more synchronous, the probability of relative motion becomes smaller, the stability is better, and the length can be extended. The overall life of the transmission.
  • the specific mounting structure for the first brake torsion spring 26 and the second brake torsion spring 14 is as follows:
  • the second brake torsion spring 14 is preferably sleeved on the middle hollow shaft 1, and the second brake torsion spring 14 includes a second torsion spring body 141 and The second torsion spring pin 142 is sleeved outside the middle hollow shaft 1, and the second torsion spring pin 142 and the second sleeve 4 are relatively fixed in the circumferential direction.
  • the second torsion spring pin 142 Since the second torsion spring pin 142 is relatively fixed in the circumferential direction with the second sleeve 4, the second torsion spring pin 142 itself remains substantially stationary, and the second torsion spring body 141 is freely sleeved in the hollow When the middle hollow shaft 1 rotates on the shaft 1, the second torsion spring body 141 is contracted or expanded by the frictional force, and when the second torsion spring body 141 is contracted, the hollow shaft 1 is gripped to generate the brake. effect.
  • connection between the second torsion spring 14 and the second sleeve 4 is specifically: the inner wall of the second sleeve 4 is provided with a positioning groove 44, and the second torsion spring pin 142 is locked in Positioned in the slot 44.
  • the second torsion spring pin 142 is assembled by carding, which is more convenient.
  • the positioning groove 44 of the embodiment extends to the top of the second sleeve 4, and the positioning groove 44 is an open groove, and the opening position is at the top end of the second sleeve 4 because the second sleeve 4 is assembled.
  • the second torsion spring pin 142 is directly aligned with the slide-in opening, so that the second torsion spring pin 142 is locked to the positioning slot 44, which is more convenient to assemble.
  • the structure of the positioning groove 44 is not limited to the structure of the open groove in the embodiment.
  • a second sleeve 15 is disposed between the second torsion spring 14 and the hollow shaft 1 in the embodiment.
  • the second bushing 15 is circumferentially fixed with the middle hollow shaft 1 and the second brake torsion spring 14 is fitted over the second bushing 15.
  • the second sleeve 15 can be made by injection molding. After the second brake torsion spring 14 is sleeved on the second sleeve 15 , the friction is mainly concentrated between the second brake torsion spring 14 and the second sleeve 15 .
  • the hollow shaft 1 itself is not subject to wear and has a longer service life.
  • a non-circular mounting section is disposed on the hollow shaft 1 , and a cross-sectional shape of the shaft hole 151 of the second bushing 15 is matched with a cross section of the non-circular mounting section, and the cross section of the mounting section of the embodiment is preferably It is a hexagon.
  • the second sleeve 4 is jacketed outside the first sleeve 3, and the first sleeve 3 is located outside the hollow shaft 1 in order to prevent the second brake torsion spring 14 from interfering with the first
  • the second brake torsion spring 14 in the present embodiment is located between the first transmission nut 31 and the second transmission nut 41 because the axial direction between the first transmission nut 31 and the second transmission nut 41 exists.
  • a certain installation space can be used to mount the second brake torsion spring 14 without changing the structure of other components.
  • the mounting structure of the second brake torsion spring 14 is not limited to the position of the embodiment.
  • a through hole may be formed in the first sleeve 3 to make the second brake torsion spring 14
  • the torsion spring pin 142 passes through the first sleeve 3 and is coupled to the second sleeve 4.
  • the drive screw 2 is mounted on a fixed plate 97 which is mounted at the top end position of the drive screw 2, and the first brake torsion spring 26 includes the first twist
  • the spring body and the first torsion spring pin are sleeved outside the driving screw 2, and the first torsion spring pin is positioned on the fixing plate 97.
  • the fixing plate 97 has a protruding portion 971 extending downward, and the protruding portion 971 is provided with a card slot.
  • the first torsion spring pin is latched in the card slot, and the first brake torsion spring 26 is Installed between the second transmission nut 41 and the fixed plate 97.
  • a first sleeve 25 is disposed between the first brake torsion spring 26 and the drive screw 2 in the embodiment, regarding the first brake.
  • the structure of the torsion spring 26 has been extensively developed in the prior art, and will not be described too much herein.
  • the non-cylindrical structure of the driving end is preferably provided with a protruding key 21 at the bottom end of the driving screw 2, and the inner hole formed by the key groove 12 on the inner wall of the hollow shaft 1 is formed by the non-circular inner hole.
  • the male key 21 is engaged with the keyway 12 to realize the power transmission between the transmission screw 2 and the hollow shaft 1.
  • the non-cylindrical structure and the non-circular inner hole are not limited to this structure, and may be, for example, a D-shaped rod and a D.
  • the cooperation of the type of holes and the cooperation of the polygonal rods and the polygonal holes can be performed as long as the non-cylindrical structure and the non-circular inner hole of the transmission power of the transmission screw 2 and the hollow shaft 1 can be realized, and the specific structure is in this embodiment. It is not impossible to exhaust.
  • the rotatable manner and the axial positioning are mainly realized by a bearing.
  • the upper end of the hollow shaft 1 is fixedly fitted with a first bearing 13 , and the first bearing 13 is fixedly mounted on the second transmission nut 41 , and the specific mounting structure is preferably
  • a stepped shaft is disposed on the upper end surface of the hollow shaft 1 , and the first bearing 13 is sleeved on the step shaft.
  • the step shaft is provided with a groove 1a.
  • the groove 1a is embedded with a circlip 13a, and the circlip 13a prevents the first A bearing 13 is disengaged from the stepped shaft of the hollow shaft 1 of the middle, and the inner wall of the second transmission nut 41 is provided with an inner groove for mounting the first bearing 13, and a mounting piece 41a is disposed below the second transmission nut 41, and the mounting piece 41a is located at the Below the bearing 13, the mounting piece 41a has a through hole 41b through which the hollow shaft 1 passes, and after the first bearing 13 is fitted into the inner groove of the second transmission nut 41, the mounting piece 41a and the second transmission nut 41 are mounted. The lower end is fixedly connected by a screw 41c. At this time, the mounting piece 41a can form an accommodating space for the first bearing 13 to be mounted with the inner groove of the second transmission nut 41, and the mounting piece 41a serves as a support plate for the first bearing 13. .
  • the first sleeve 3 and the second sleeve 4 are both non-circular tubes.
  • the first sleeve 3 and the second sleeve 4 are preferably square tubes, of course, the first sleeve 3 and The second sleeve 4 can also be a non-circular tube of other shapes.
  • the first transmission nut 31 is engaged with the upper end of the first sleeve 3, and the second transmission nut 41 is engaged with the upper end of the second sleeve 4.
  • the specific clamping structure is adopted, and the first sleeve 3 is adopted.
  • the upper inner wall of the second sleeve 4 is provided with a buckle 4a.
  • the outer portion of the first transmission nut 31 is provided with a card slot 31a, and the outer portion of the second transmission nut 41 is provided with a card slot 411. Pressing the first transmission nut 31 into the first sleeve 3 by means of punching and riveting, so that the buckle 3a and the slot 31a are snap-fitted, and similarly, the second transmission nut 41 is pressed into the second sleeve by means of punching and riveting.
  • the buckle 4a and the card slot 411 are snap-fitted, it is worth noting that the positions of the buckle 3a and the card slot 31a and the buckles 4a and 41a are interchangeable, that is, the upper inner wall of the first sleeve 3
  • the upper inner wall of the second sleeve 4 can be provided with a card slot.
  • the first transmission nut 31 and the second transmission nut 41 can be provided with a buckle, and the above-mentioned snapping function can also be realized.
  • the manner of punching and riveting means that the first transmission nut 31 is pressed into the first sleeve 3 by mechanical pressure, and the second transmission nut 41 is pressed into the second sleeve 4 during the assembly process.
  • the buckle 3a and the buckle 4a are first deformed, and finally the buckle 3a is partially or completely restored into the card slot 31a, and the buckle 4a is partially or completely restored into the card slot 411, thereby realizing the first transmission nut 31.
  • first transmission nut 31 and the second transmission nut 41 are used with the first sleeve 3 and the second sleeve.
  • the non-circular nut of the tube 4 is adapted, since the first sleeve 3 and the second sleeve 4 are both non-circular tubes and preferably square tubes are used, correspondingly, the first transmission nut 31 and the second transmission nut 41 are also It is preferred to adopt a cube shape that is adapted to the square tube.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a lifting column includes an inner tube 5 , a middle tube 6 , an outer tube 7 , and a bottom case 8 fixedly connected to the upper end of the inner tube 5 .
  • the driving device 9 in the bottom case 8 and the transmission device in the driving engagement with the driving device 8 are the transmission devices described in the first embodiment.
  • the bottom case 8 includes a box body 81 and a cover 82.
  • the cover 82 is fastened to the opening of the box body 81 so that the bottom case 8 has an accommodating space for accommodating the driving device 9.
  • the driving device 9 is in driving engagement with the upper end of the driving screw 2,
  • the bottom end of the outer tube 7 is provided with a bottom plate 71.
  • the lower end of the first sleeve 3 abuts against the bottom plate 71, and the second sleeve 4 drives the middle tube 6 to move up and down.
  • the second sleeve 4 drives the middle tube 6 to be lifted and lowered.
  • the outer wall of the lower portion of the second sleeve 4 is provided with a fixing block 42 having a convex edge 421 extending outwardly.
  • the 421 is located below the wall of the middle tube 6 .
  • the fixing block 42 is divided into two pieces, and the inner surface of the fixing block 42 contacting the outer wall of the second sleeve 4 is provided.
  • the outer wall of the second sleeve 4 is provided with a through hole 43 through which the two fixing blocks 42 are fixedly mounted on the outer wall of the second sleeve 4, and the second sleeve 4 is When lifting, the middle tube 6 can be lifted by the convex edge 421. When the second sleeve 4 is lowered, the middle tube 6 is automatically lowered by gravity.
  • the structural advantage is that the assembly of the fixing block 42 is relatively simple and convenient, and the middle tube 6 is also There is no need to specifically assemble with the fixed block 42.
  • the lower end of the second sleeve 4 can be fixedly connected to the lower end of the middle tube 6, and the second sleeve 4 can also be used to lift and lower the middle tube 6.
  • the running process of the lifting column is as follows: the driving device 9 drives the driving screw 2 to rotate, and when the driving screw 2 rotates, the hollow shaft 1 is synchronously rotated by the driving end.
  • the driving screw 2 rotates itself
  • the second transmission nut 41 and the second sleeve 4 are synchronously and linearly moved, and the downward displacement of the second sleeve 4 relative to the transmission screw 2 is tentatively set to L1; meanwhile, when the hollow shaft 1 itself rotates,
  • the first transmission nut 31 and the first sleeve 3 move linearly synchronously, and the displacement of the first sleeve 3 relative to the hollow shaft 1 is tentatively set L2, which is equivalent to the rotation of the second sleeve 4 when the transmission screw 2 rotates.
  • the first sleeve 3 is also lowered, and since the middle hollow shaft 1 and the second transmission nut 41 are held in the axial direction, the first sleeve 3 is L1+L2 with respect to the transmission screw 2 as a whole. Displacement. Compared with the conventional single transmission nut and the same rotation of the transmission screw, the relative displacement of the first sleeve 3 in this embodiment is larger, so that the lifting and lowering effect per unit time is faster. .
  • the bottom end of the first sleeve 3 applies a thrust force to the bottom plate 71. Since the bottom end of the outer tube 7 of the lifting column is connected to the column leg during use, the column leg is supported on the ground, The drive screw 2 will drive the bottom case to rise or fall, and when the second sleeve 4 makes a linear ascending motion, the second sleeve 4 will drive the middle tube 6 together by the convex edge 421 to rise, and the second sleeve 4 will be linear. During the descending movement, the middle tube 6 is automatically lowered and retracted by the influence of gravity.
  • the outer tube 7 and the first sleeve 3 remain relatively stationary in the axial direction
  • the middle tube 6 and the second sleeve 4 remain relatively stationary in the axial direction
  • the inner tube 5 and the transmission screw 2 are axially Keep it relatively motionless. In this way, the function of the outer tube 7 not moving and the inner tube 5 and the middle tube 6 moving up and down with respect to the outer tube 7 is realized.
  • the driving device 9 includes a motor 91, a worm connected to the output shaft of the motor 91, a housing 93 fixed to the outer casing of the motor 91, and a worm wheel disposed in the housing 93.
  • the worm extends into the housing 93 and The worm wheel drive cooperates with a special-shaped hole provided on the worm wheel.
  • the transmission screw 2 has an input end, and the input end is configured as a profiled rod body 22, and the profiled rod body 22 passes through the box body 81 and the housing 93 to cooperate with the profiled hole, the profiled hole and the profiled shape.
  • the shaped portion of the rod 22 refers to a non-cylindrical structure, the shaped hole preferably adopts a hexagonal hole, and the shaped rod 22 preferably adopts a hexagonal rod adapted to a hexagonal hole.
  • the shaped hole and the shaped rod 22 can also adopt other polygonal shaped structures, as long as The power transmission of the profiled hole and the profiled body 22 can be implemented.
  • the housing 93 includes an upper housing and a lower housing.
  • the upper housing and the lower housing are fixedly assembled by bolts 933.
  • the upper housing or the lower housing is fixedly coupled to the motor 91 housing, which may be integrally injection molded.
  • the driving device 9 can be independently assembled in advance and loaded into the bottom case 8 as a unitary component without separately loading the motor 91 and the worm wheel into the bottom case 8, which is greatly improved. Assembly efficiency of the lifting column.
  • the lower end of the first sleeve 3 is provided with an end cover 32, and the end cover 32 is engaged with the lower end of the first sleeve 3, specifically adopting the snap-fit structure and the punching and riveting assembly manner as in the first embodiment, that is, the first
  • the inner wall of the lower end of the sleeve 3 is provided with a buckle.
  • the outer wall of the end cover 32 is provided with a card slot 321 .
  • the end cover 32 is pressed into the lower end opening of the first sleeve 3 by mechanical pressure to realize the buckle and the slot 321 .
  • the outer wall of the end cover 32 can also be provided with a buckle, and correspondingly, the inner wall of the lower end of the first sleeve 3 is provided with a card slot, and the engagement of the end cover 32 with the first sleeve 3 can also be achieved.
  • the end cap 32 and the bottom plate 71 are fixedly connected by bolts 72.

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Abstract

本发明公开了一种传动装置,属于传动装置领域,包括中空心轴,所述中空心轴内设有传动螺杆,所述传动螺杆与中空心轴之间保持周向方向同步转动且轴向方向滑动配合,所述中空心轴外壁设有外螺纹并螺纹配合有第一传动螺母,中空心轴通过第一传动螺母连接有第一套管,所述传动螺杆螺纹配合有第二传动螺母并通过第二传动螺母连接有第二套管,所述第二传动螺母与中空心轴保持轴向相对固定且周向相对转动,所述传动装置包括对传动螺杆制动的第一制动扭簧,和对中空心轴制动的第二制动扭簧。另外,本发明还公开了一种升降立柱。本发明的优点在于可以有效提升传动装置的自锁力,而且传动更加平稳。

Description

一种传动装置和升降立柱 【技术领域】
本发明属于传动装置领域,特别是涉及一种传动装置及升降立柱。
【背景技术】
电动升降立柱被广泛应用于家居、医疗等领域,现有的电动升降立柱的管体一般包括由内向外依次套装的内管、中管、外管、与内管上端固定连接的底壳、设置于底壳中的驱动装置以及与驱动装置传动配个的传动装置,为了使电动升降立柱的行程尽可能的大,其中的传动装置通常设置成套装在一起的传动螺杆和中空螺杆,并且通过在内管和中管上分别设置传动螺母,使之与传动螺杆和中空螺杆进行配合,从而实现内管、中管和外管的相对伸缩。
例如中国发明专利CN207016433U公开的“一种可伸缩的传动总成装置和升降立柱”,其中详细公开了利用传动螺杆、中空螺杆的配合、连接方式,但是目前这种传动总成装置和升降立柱也存在自锁力不足的问题,导致使用在负载较大的升降平台上时,无法满足使用需求。
【发明内容】
本发明所要解决的技术问题就是提供一种传动装置和升降立柱,可以有效提升传动装置的自锁力,而且传动更加平稳。
为解决上述技术问题,本发明采用如下技术方案:
一种传动装置,包括中空心轴,所述中空心轴内设有传动螺杆,所述传动螺杆与中空心轴之间保持周向方向同步转动且轴向方向滑动配合,所述中空心轴外壁设有外螺纹并螺纹配合有第一传动螺母,中空心轴通过第一传动螺母连接有第一套管,所述传动螺杆螺纹配合有第二传动螺母并通过第二传动螺母连 接有第二套管,所述第二传动螺母与中空心轴保持轴向相对固定且周向相对转动,所述传动装置包括对传动螺杆制动的第一制动扭簧,和对中空心轴制动的第二制动扭簧。
采用本发明的有益效果:
1、传统的传动装置中,为了让传动装置具备一定的自锁力,会在传动螺杆上设置一个制动扭簧,当传动螺杆发生反向转动的趋势时,制动扭簧会抱紧传动螺杆实现制动作用,但是一个制动扭簧所能提供的自锁力是有限的,故本发明中对传动装置增加一个额外的制动扭簧,用双扭簧制动的方式来提升制动效果;
2、单个制动扭簧,在实现制动作用时,只对传动螺杆的局部一个位置进行制动,然而传动螺杆、中空心轴本身是细长结构的部件,如果只是一味对某一个位置制动,远离该位置的部位则会发生一定程度的晃动,类似于自行车的前刹车制动力过大时,自行车的后部会发生甩动的原理一样,所以单个制动扭簧制动,在制动时稳定性不佳,而采用双扭簧制动,可以一定程度上对不同部位实现制动,制动效果更佳平稳,减少传动装置的晃动度;
3、传动装置的动力传递,传动螺杆通过第二传动螺母带动第二套管升降,中空心轴通过第一传动螺母带动第一套管升降,第二传动螺母与中空心轴之间轴向相对固定、周向相对转动,由于在装配过程中、制造过程中均存在精度误差,例如螺纹连接配合时,虽然是咬合,但是轴向存在一定间隙,导致传动装置在升降切换时,传动螺杆和中空心轴的动力传递过程会存在短暂的空载,而在短暂空载期间,传动螺杆、中空心轴会发生一定程度的窜动,如果仅对传动螺杆进行扭簧制动,中空心轴短时间内不会受到制动力,并不能避免两者之间发生相互窜动。但是如果对传动螺杆设置制动扭簧,对中空心轴也设置制动扭 簧,相当于两个单体部件同时受到制动力,当中空心轴、传动螺杆从正转转换到反转时,两个部件均会受到制动力,相当于两者之间是同步制动,所以两者之间传动更加同步,发生相对运动的几率变小,稳定性更好,同时也能延长了传动装置的整体寿命。
作为优选,所述第二制动扭簧套设在中空心轴上。
作为优选,所述第二制动扭簧包括第二扭簧主体和第二扭簧引脚,所述第二扭簧主体套在中空心轴外,所述第二扭簧引脚与所述第二套管在周向方向上保持相对固定。
作为优选,所述第二套管的内壁上设有定位槽,所述第二扭簧脚卡装在定位槽内。
作为优选,所述定位槽延伸至第二套管的顶部。
作为优选,所述第二制动扭簧与中空心轴之间设有第二轴套,所述第二轴套与中空心轴之间保持周向固定,所述第二制动扭簧套装在第二轴套上。
作为优选,所述第二套管套装于第一套管外部,所述第二制动扭簧位于第一传动螺母和第二传动螺母之间。
作为优选,所述传动螺杆安装在一固定板上,所述第一制动扭簧包括第一扭簧主体和第一扭簧引脚,所述第一扭簧主体套在传动螺杆外,所述第一扭簧引脚定位在固定板上。
作为优选,所述传动螺杆具有驱动端,所述驱动端为非圆柱结构,所述中空心轴具有非圆内孔,非圆柱结构与非圆内孔适配以使传动螺杆传递驱动力至中空心轴。
作为优选,所述中空心轴的上端固定套装有第一轴承,所述第一轴承被固定安装于第二传动螺母上。
作为优选,所述第一套管和第二套管均为非圆管,所述第一传动螺母卡接于第一套管的上端,所述第二传动螺母卡接于第二套管的上端。
另外,本发明还公开了一种升降立柱,包括由内向外依次套装的内管、中管、外管、与内管上端固定连接的底壳、设置于底壳中的驱动装置以及与驱动装置传动配合的传动装置,所述传动装置为上述方案中任意一种所述的传动装置,所述驱动装置与传动螺杆传动配合,所述外管下端设有底板,所述第一套管的下端抵持于底板,所述第二套管带动中管升降。
本发明的具体技术效果将在具体实施方式中予以进一步说明。
【附图说明】
以下结合附图和具体实施方式对本发明进行进一步描述:
图1是本发明实施例一中传动装置的爆炸示意图;
图2是本发明实施例一中传动装置的局部结构示意图;
图3是本发明实施例一中传动装置的局部内部结构示意图;
图4是本发明实施例一中传动装置的内部结构示意图;
图5是本发明实施例二中升降立柱的爆炸示意图;
图6是本发明实施例二中升降立柱的剖视图。
【具体实施方式】
下面结合附图对本发明的具体实施方式作详细说明。
下面结合本发明实施例的附图对本发明实施例的技术方案进行解释和说明,但下述实施例仅为本发明的优选实施例,并非全部。基于实施方式中的实施例,本领域技术人员在没有做出创造性劳动的前提下所获得其他实施例,都属于本发明的保护范围。
在下文描述中,出现诸如术语“内”、“外”、“上”、“下”、“左”、“右”等指示方位或者位置关系的为基于附图所示的方位或位置关系,仅是为了方便描 述实施例和简化描述,而不是指示或暗示所指的装置或者元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。
实施例一:
如图1所示,一种传动装置,包括中空心轴1、传动螺杆2、第一套管3和第二套管4,中空心轴1的外壁上设有外螺纹11,传动螺杆2位于中空心轴1内,传动螺杆2具有驱动端,该驱动端为非圆柱结构,中空心轴1具有非圆内孔,非圆柱结构与非圆内孔适配从而使传动螺杆2传递驱动力至中空心轴1从而带动带动中空心轴1同步旋转。
其中,第一套管3的上部固定连接有第一传动螺母31,中空心轴1上的外螺纹11与第一传动螺母31螺纹配合,第二套管4套装于第一套管3外部,第二套管4的上部固定连接有第二传动螺母41,传动螺杆2与第二传动螺母41螺纹配合,中空心轴1与第二传动螺母41之间的连接关系为:中空心轴1以可旋转的方式与第二传动螺母41在轴向上定位,也就是说,中空心轴1可以相对第二传动螺母41转动,但无法在轴向上相对第二传动螺母41移动。这种利用传动螺杆2、中空心轴1配合传动的结构在现有技术中已有公开,不作过多阐述。
本实施例中为了增加整个传动装置的自锁力,所述传动装置包括对传动螺杆2制动的第一制动扭簧26,和对中空心轴1制动的第二制动扭簧14。
采用这种双扭簧制动的方案的优先在于:
1、传统的传动装置中,为了让传动装置具备一定的自锁力,会在传动螺杆2上设置一个制动扭簧,当传动螺杆2发生反向转动的趋势时,制动扭簧会抱紧传动螺杆2实现制动作用,但是一个制动扭簧所能提供的自锁力是有限的,本实施例中对传动装置增加一个额外的制动扭簧,用双扭簧制动的方式来提升制动效果;
2、单个制动扭簧,在实现制动作用时,只对传动螺杆2的局部一个位置进行制动,然而传动螺杆2、中空心轴1本身是细长结构的部件,如果只是一味对某一个位置制动,远离该位置的部位则会发生一定程度的晃动,类似于自行车的前刹车制动力过大时,自行车的后部会发生甩动的原理一样,所以单个制动扭簧制动,在制动时稳定性不佳,而采用双扭簧制动,可以一定程度上对不同位置实现制动,制动效果更佳平稳,减少传动装置的晃动度;
3、传动装置的动力传递,传动螺杆2通过第二传动螺母41带动第二套管4升降,中空心轴1通过第一传动螺母31带动第一套管3升降,第二传动螺母41与中空心轴1之间轴向相对固定、周向相对转动,由于在装配过程中、制造过程中均存在精度误差,例如螺纹连接配合时,虽然是咬合,但是轴向存在一定间隙,导致传动装置在升降切换时,传动螺杆2和中空心轴1的动力传递过程会存在短暂的空载,而在短暂空载期间,传动螺杆2、中空心轴1会发生一定程度的窜动,如果仅对传动螺杆2进行扭簧制动,中空心轴1短时间内不会受到制动力,并不能避免两者之间发生相互窜动。但是如果对传动螺杆2设置制动扭簧,对中空心轴1也设置制动扭簧,相当于两个单体部件同时受到制动力,当中空心轴1、传动螺杆2从正转转换到反转时,两个部件均会受到制动力,相当于两者之间是同步制动,所以两者之间传动更加同步,发生相对运动的几率变小,稳定性更好,同时也能延长了传动装置的整体寿命。
对于第一制动扭簧26和第二制动扭簧14的具体安装结构如下:
如图2至图4所示,本实施例中所述第二制动扭簧14优选是套设在中空心轴1上,所述第二制动扭簧14包括第二扭簧主体141和第二扭簧引脚142,所述第二扭簧主体141套在中空心轴1外,所述第二扭簧引脚142与所述第二套管4在周向方向上保持相对固定。
第二扭簧引脚142由于与第二套管4在周向方向上保持相对固定,故第二扭簧引脚142本身基本保持不动,而第二扭簧主体141是自由套在中空心轴1上,中空心轴1发生转动时,第二扭簧主体141会受到摩擦力的作用而发生收缩或扩张,当第二扭簧主体141收缩时会抱紧中空心轴1从而产生制动效果。
本实施例中第二制动扭簧14与第二套管4的连接具体为:所述第二套管4的内壁上设有定位槽44,所述第二扭簧引脚142卡装在定位槽44内。第二扭簧引脚142利用卡装的方式,组装起来更加方便。
作为优选,本实施例所述定位槽44延伸至第二套管4的顶部,相当于定位槽44是一个开口槽,开口位置在第二套管4的顶端,因为第二套管4在组装时,是从下方套入,故套入时,第二扭簧引脚142直接对准滑入开口,即可实现第二扭簧引脚142卡装到定位槽44,这样组装起来更加方便。当然,在别的实施方式中,定位槽44的结构不局限于本实施例中的开口槽的结构。
另外,为了减少第二制动扭簧14与中空心轴1之间的磨损度,本实施例中所述第二制动扭簧14与中空心轴1之间设有第二轴套15,所述第二轴套15与中空心轴1之间保持周向固定,所述第二制动扭簧14套装在第二轴套15上。第二轴套15可以采用注塑制成,第二制动扭簧14套在第二轴套15上后,摩擦力主要集中在第二制动扭簧14与第二轴套15之间,中空心轴1本身不会受到磨损,使用寿命更长。本实施例中,中空心轴1上设置一个非圆的安装段,而第二轴套15的轴孔151的截面形状与该非圆的安装段的截面匹配,本实施例安装段的截面优选为六边形。
此外,本实施例中第二套管4是外套在第一套管3外,而第一套管3则是位于中空心轴1外,为了让第二制动扭簧14避免干涉到第一套管3,本实施例中所述第二制动扭簧14位于第一传动螺母31和第二传动螺母41之间,因为第 一传动螺母31和第二传动螺母41的轴向之间存在一定的安装空间可以用于安装第二制动扭簧14,而不用改变其他部件的结构。当然第二制动扭簧14的安装结构也不局限于本实施例的位置,如果设置在其他位置,则可以在第一套管3上开设穿孔,让第二制动扭簧14的第二扭簧引脚142穿过第一套管3并连接到第二套管4上。
对于第一制动扭簧26的安装结构,所述传动螺杆2安装在一固定板97上,固定板97安装在传动螺杆2的顶端位置,所述第一制动扭簧26包括第一扭簧主体和第一扭簧引脚,所述第一扭簧主体套在传动螺杆2外,所述第一扭簧引脚定位在固定板97上。
具体而言,是固定板97朝下延伸有凸出部971,凸出部971上设有卡槽,第一扭簧引脚是卡装在该卡槽内,第一制动扭簧26是安装在第二传动螺母41与固定板97之间。同理,为了减少第一制动扭簧26与传动螺杆2之间的磨损,本实施例第一制动扭簧26与传动螺杆2之间设有第一轴套25,关于第一制动扭簧26的结构在现有技术中已有较多展开,本文不作过多阐述。
本实施例中其他优选的结构具体如下:
在本实施例中,驱动端优选采用的非圆柱结构为设在传动螺杆2的底端设有凸键21,非圆内孔为中空心轴1的内壁上设置了键槽12所形成的内孔,凸键21与键槽12卡接配合,进而实现传动螺杆2与中空心轴1的动力传递,但非圆柱结构和非圆内孔并不局限于此结构,也可以是诸如D型杆和D型孔的配合及多边形杆和多边形孔的配合等等,只要能够实现传动螺杆2与中空心轴1的旋转动力的传递的非圆柱结构和非圆内孔均可,具体的结构在此实施例中不无法穷举。
这种可旋转的方式并轴向定位主要通过轴承来实现,中空心轴1的上端固 定套装有第一轴承13,第一轴承13被固定安装于第二传动螺母41上,具体的安装结构优选为,在中空心轴1上端轴面上设有台阶轴,第一轴承13套装在台阶轴上,台阶轴上设有凹槽1a,凹槽1a中嵌入有卡簧13a,卡簧13a防止第一轴承13从中空心轴1的台阶轴上脱出,第二传动螺母41内壁上设有安装第一轴承13的内槽,并且第二传动螺母41的下方设有安装片41a,安装片41a位于第一轴承13的下方,安装片41a具有供中空心轴1穿过的通孔41b,在第一轴承13装入第二传动螺母41的内槽后,将安装片41a与第二传动螺母41的下端通过螺钉41c固定连接,此时,安装片41a便可与第二传动螺母41的内槽形成供第一轴承13安装的容置空间,而安装片41a则充当了第一轴承13的支撑板。
第一套管3和第二套管4均为非圆管,为了便于加工,在本实施例中,第一套管3和第二套管4优选采用方管,当然第一套管3和第二套管4也可以采用其他形状的非圆管。第一传动螺母31卡接于第一套管3的上端,第二传动螺母41卡接于第二套管4的上端,在本实施例中,具体的卡接结构采用,第一套管3的上部内壁上设有卡扣3a,第二套管4的上部内壁上设有卡扣4a,第一传动螺母31的外部设有卡槽31a,第二传动螺母41的外部设有卡槽411,通过冲铆的方式将第一传动螺母31压入第一套管3使得卡扣3a和卡槽31a卡接配合,同样的,通过冲铆的方式将第二传动螺母41压入第二套管4中使得卡扣4a和卡槽411卡接配合,值得说明的是卡扣3a和卡槽31a以及卡扣4a和41a的设置位置可以互换,也就是说第一套管3的上部内壁以及第二套管4的上部内壁可以设置卡槽,相应的,第一传动螺母31以及第二传动螺母41上可以设置卡扣,同样能实现上述卡接功能。在本实施例中,冲铆的方式是指借助机械压力将第一传动螺母31压入第一套管3中,将第二传动螺母41压入第二套管4中,在此装配过程中,卡扣3a和卡扣4a首先产生形变,最终卡扣3a部分或全部恢 复形变卡入卡槽31a中,卡扣4a部分或全部恢复形变卡入卡槽411中,从而实现第一传动螺母31和第一套管3以及第二传动螺母41和第二套管4的无螺钉装配,值得说明的是,第一传动螺母31和第二传动螺母41采用与第一套管3和第二套管4适配的非圆形螺母,由于第一套管3和第二套管4均为非圆管并优选采用了方管,因此相应的,第一传动螺母31和第二传动螺母41也优选采用与方管适配的立方体形状。
实施例二:
结合图1、图5、图6所示,一种升降立柱,包括由内向外依次套装的内管5、中管6、外管7、与内管5上端固定连接的底壳8、设置于底壳8中的驱动装置9以及与驱动装置8传动配合的传动装置,该传动总成即实施例一中所述的传动装置。底壳8包括盒体81及盒盖82,盒盖82扣合于盒体81的开口使得底壳8具有容置空间用于容纳驱动装置9,驱动装置9与传动螺杆2的上端传动配合,外管7下端设有底板71,第一套管3的下端抵持于底板71,第二套管4带动中管6升降。
在本实施例中,第二套管4带动中管6升降采用的方案是,第二套管4下部的外壁上设有固定块42,固定块42具有向外侧延伸的凸沿421,该凸沿421位于中管6管壁的下方,在本实施例中,为了便于固定块42的安装,固定块42分为两块,固定块42与第二套管4的外壁接触的内表面设有凸柱422,第二套管4的外壁上设有通孔43,通过凸柱422伸入通孔43实现两块固定块42固定安装在二套管4的外壁上,当第二套管4提升时,便可通过凸沿421提升中管6,当第二套管4下降时,中管6受重力作用自动下降,这样的结构好处是固定块42的装配较为简单方便,中管6也无需特别与固定块42进行装配。当然,还可以采用第二套管4的下端与中管6的下端固定连接,同样可以实现第二套管4 带动中管6升降的目的。
升降立柱的运行过程为:驱动装置9驱动传动螺杆2转动,传动螺杆2转动时通过驱动端带动中空心轴1同步旋转。传动螺杆2自身转动时带动第二传动螺母41和第二套管4同步线性移动,第二套管4相对于传动螺杆2下降位移暂定为L1;同时,中空心轴自身1转动时,带动第一传动螺母31、第一套管3同步线性移动,第一套管3相对于中空心轴1下降的位移暂定L2,相当于传动螺杆2转动时,既带动第二套管4下降,也带动第一套管3下降,由于中空心轴1与第二传动螺母41在轴向上保持位置固定,故整体而言,第一套管3相对于传动螺杆2,发生了L1+L2的位移。这种结构的设计,相比较传统的单传动螺母,传动螺杆同样转动一圈的前提下,本实施例中第一套管3发生的相对位移更大,从而实现单位时间内升降更快的效果。
在第一套管3进行线性运动时,第一套管3的底端向底板71施加推力,由于升降立柱的外管7的底端在使用时连接立柱支脚,立柱支脚支撑于地面上,因此,传动螺杆2将会带动底壳上升或下降,而在第二套管4做线性上升运动时,第二套管4通过凸沿421带动中管6一起上升,在第二套管4做线性下降运动时,中管6受重力影响自动下降而缩回。即整个过程中,外管7与第一套管3在轴向保持相对不动,中管6与第二套管4在轴向保持相对不动,内管5则与传动螺杆2在轴向保持相对不动。如此,实现了外管7不动,而内管5和中管6分别相对于外管7升降的功能。
在本实施例中,驱动装置9包括马达91、连接于马达91输出轴上的蜗杆、固定于马达91外壳上的壳体93以及设置于壳体93中的蜗轮,蜗杆伸入壳体93与蜗轮传动配合,蜗轮上设有的异型孔,传动螺杆2具有输入端,输入端被构造成异型杆体22,该异型杆体22穿过盒体81及壳体93与异型孔配合,异型孔 和异型杆体22中的异型指的是非圆柱状结构,异型孔优选采用六角孔,异型杆体22优选采用适配六角孔的六角杆,当然,异型孔和异型杆体22也可以采用其他多边形的异型结构,只要能实现异型孔和异型杆体22的动力传递均可实施。
另外,壳体93包括上壳体和下壳体,上壳体和下壳体通过螺栓933固定装配,上壳体或下壳体与马达91外壳固定连接,其可以是一体注塑成型,因此,在升降立柱装配前,驱动装置9可以事先进行独立装配,并作为一个整体部件装入底壳8中,而不需要将马达91和蜗轮分别装入底壳8中,这样在很大程度提高了升降立柱的装配效率。
第一套管3的下端设有端盖32,端盖32卡接于第一套管3的下端,具体采用如实施例一中的卡接结构及冲铆装配方式,也就是说,第一套管3的下端内壁上设有卡扣,端盖32的外壁上设有卡槽321,端盖32受机械压力被压入第一套管3的下端开口,实现卡扣和卡槽321的卡接,当然,端盖32的外壁也可以设置卡扣,而相应的,第一套管3的下端内壁上设置卡槽,同样可以实现端盖32与第一套管3的卡接。而最后,端盖32与底板71是通过螺栓72固定连接。
以上就本发明较佳的实施例做了说明,但不能理解为是对权利要求的限制。本发明不仅局限于以上实施例,其具体结构允许有变化,本领域技术人员可以根据本发明作出各种改变和变形,只要不脱离本发明的精神,均属于本发明所附权利要求所定义的范围。

Claims (12)

  1. 一种传动装置,包括中空心轴,所述中空心轴内设有传动螺杆,所述传动螺杆与中空心轴之间保持周向方向同步转动且轴向方向滑动配合,所述中空心轴外壁设有外螺纹并螺纹配合有第一传动螺母,中空心轴通过第一传动螺母连接有第一套管,所述传动螺杆螺纹配合有第二传动螺母并通过第二传动螺母连接有第二套管,所述第二传动螺母与中空心轴保持轴向相对固定且周向相对转动,其特征在于,所述传动装置包括对传动螺杆制动的第一制动扭簧,和对中空心轴制动的第二制动扭簧。
  2. 根据权利要求1所述的一种传动装置,其特征在于,所述第二制动扭簧套设在中空心轴上。
  3. 根据权利要求2所述的一种传动装置,其特征在于,所述第二制动扭簧包括第二扭簧主体和第二扭簧引脚,所述第二扭簧主体套在中空心轴外,所述第二扭簧引脚与所述第二套管在周向方向上保持相对固定。
  4. 根据权利要求3所述的一种传动装置,其特征在于,所述第二套管的内壁上设有定位槽,所述第二扭簧引脚卡装在定位槽内。
  5. 根据权利要求4所述的一种传动装置,其特征在于,所述定位槽延伸至第二套管的顶部。
  6. 根据权利要求3所述的一种传动装置,其特征在于,所述第二制动扭簧与中空心轴之间设有第二轴套,所述第二轴套与中空心轴之间保持周向固定,所述第二制动扭簧套装在第二轴套上。
  7. 根据权利要求1所述的一种传动装置,其特征在于,所述第二套管套装于第一套管外部,所述第二制动扭簧位于第一传动螺母和第二传动螺母之间。
  8. 根据权利要求1所述的一种传动装置,其特征在于,所述传动螺杆安装在一固定板上,所述第一制动扭簧包括第一扭簧主体和第一扭簧引脚,所述 第一扭簧主体套在传动螺杆外,所述第一扭簧引脚定位在固定板上。
  9. 根据权利要求1所述的一种传动装置,其特征在于,所述传动螺杆具有驱动端,所述驱动端为非圆柱结构,所述中空心轴具有非圆内孔,非圆柱结构与非圆内孔适配以使传动螺杆传递驱动力至中空心轴。
  10. 根据权利要求1所述的一种传动装置,其特征在于,所述中空心轴的上端固定套装有第一轴承,所述第一轴承被固定安装于第二传动螺母上。
  11. 根据权利要求1所述的一种传动装置,其特征在于,所述第一套管和第二套管均为非圆管,所述第一传动螺母卡接于第一套管的上端,所述第二传动螺母卡接于第二套管的上端。
  12. 一种升降立柱,包括由内向外依次套装的内管、中管、外管、与内管上端固定连接的底壳、设置于底壳中的驱动装置以及与驱动装置传动配合的传动装置,其特征在于,所述传动装置为权利要求1至11中任意一项所述的传动装置,所述驱动装置与传动螺杆传动配合,所述外管下端设有底板,所述第一套管的下端抵持于底板,所述第二套管带动中管升降。
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