TWI483888B - Lifting device with a safety descending mechanism - Google Patents

Description

Lifting device with safety descent mechanism

The present invention provides a lifting device having a safety descent mechanism, which is related to the structure of the lifting device, and particularly to a device having a descending device.

Lifting devices, whether passenger or freight elevators, the stability and safety of the lifting and lowering are the primary considerations of the device, especially the safety of the passenger elevator; therefore, the general lifting device will be equipped with a safety descent device 10, such as As shown in FIG. 1 , the safety descent device 10 mainly includes a pedestal 11 , a pivoting wheel 13 is pivotally disposed on a pedestal 11 , and a weight tapping member 14 is disposed on the pedestal 11 . The speed regulating wheel 13 is wound around the safety cable A which is arranged in the same manner as the lifting device box, so that the speed regulating wheel 13 and the safety cable A move synchronously, and when the lifting box is abnormally rapidly descending, the setting is set. The counterweight tapping member 14 on the base 11 generates centrifugal force and yaws the actuating switch, thereby activating the safety protection action of the emergency brake. However, the safety descent device 10 can only be applied to the cable drive. The lifting device cannot be applied to the lifting device driven by the non-steel cable, and once the building floor of the safety descent device 10 is installed, the length of the cable is long and the cost of the device is high; in addition, as shown in Fig. 2 Shown as another safety descent device 2 The safety descent device 20 mainly includes a roller 21 connected to a clutch unit 23 by a connecting rod 22, and the clutch unit 23 further includes a box body 231, a rotating plate 232, a plurality of weights 233, and a spring 234. The roller 21 is connected to one end of the connecting rod 22, and the connecting The other end of the rod 22 extends into the box body 231 and is coupled with the rotating plate 232. The weights 233 are eccentrically disposed on the rotating plate 232, and the weights 233 are connected by a spring 234. The roller 21 of the descending device 20 is movably received in the guide rail of the lifting device and can drive the car to move up and down along the guide rail. When the car box is abnormally rapidly descended, the roller 21 rotates rapidly and synchronously drives the connecting rod 22 And the rotating plate 232 is rotated, and the weight 233 disposed on the rotating plate 232 is decelerated by the centrifugal force pulling out the contact with the casing 231 to generate a frictional force, thereby reducing the descending speed of the vehicle; however, due to the clutch unit 23 is to decelerate the roller 21 accommodated in the guide rail, and the roller 21 and the guide rail are likely to slip due to rolling displacement. Once the abnormal situation of the slip occurs, the safety descent device 20 may not necessarily produce a certain The deceleration effect, therefore, there are still safety concerns; in view of this, the inventors have devoted themselves to research and deeper conceiving, and after many trials and developments, finally invented a lifting device with a safe descending mechanism.

The present invention provides a lifting device having a safety descent mechanism, the main purpose of which is to solve the problem of the safety concerns of the conventional safety descent device.

In order to achieve the foregoing objective, the present invention provides a lifting device having a safety descent mechanism, comprising: a base having a fixed assembly portion; a driving unit including a driving source, a screw and a nut, the driving source Fixedly disposed on the base, the driving source drives an end connected to the screw, the nut is screwed to the screw; a movable frame fixedly connected to the nut and linearly displaceable in the base; a lifting platform fixedly connected to the driving frame; a descending unit comprising a housing fixedly disposed on the fixed assembly portion One side of the screw extends into the housing; a turntable is received in the housing and coupled with the screw; a plurality of centrifugal friction blocks surround the screw and are pivotally disposed on the turntable; The centrifugal friction blocks are respectively connected by a spring.

The descending unit can directly decelerate the screw for driving the lifting and lowering movement in an abnormal state, and the matching structure of the screw and the nut can decelerate decelerately and the lifting platform can be safely lowered and lowered, thereby ensuring the safety of use of the overall lifting device. .

In order to enable the reviewing committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [detailed description of the drawings] as follows: The preferred lifting device of the present invention having a safe descending mechanism is preferred. For example, the third embodiment includes a pedestal 30 having a rail portion 31 on each side, and a fixed assembly portion 32 is fixed on the base 30. The fixing assembly portion 32 has a through hole 321 . A driving unit 40 includes a driving source 41, a screw 42 and a nut 43 fixedly disposed on the base 30, and the driving source 41 drives an end connected to the screw 42 and can drive the driving unit 41. The screw 42 is rotated, the nut 43 is screwed to the screw 42 and is displaceable on the screw 42, and the other end of the screw 42 has a connecting section 421 and a locking section 422. The connecting section 421 has a rotation stop. Key 423, and the locking segment 422 has an external thread; The movable frame 50 is fixedly connected to the nut 43 , and a sliding block 51 is disposed on each side of the driving frame 50 , and the sliding block 51 of the driving frame 50 is correspondingly slidably disposed on the rail portion 31 of the base 30 ; The stage 60 is fixedly coupled to the driving frame 50; a descending unit 70 includes a housing 72, a turntable 73, a plurality of centrifugal friction blocks 74, a plurality of springs 75, and a positioning member 76, wherein: two of the housings 72 The first end 721 and the second opening 722 are respectively disposed at a position where the first opening 721 communicates with the through hole 321 and is fixedly disposed on one side of the fixing assembly 32, and the connecting portion 421 of the screw 42 And the locking portion 422 extends through the through hole 321 of the fixing assembly 32 and extends into the housing 72 through the first opening 721 of the housing 72; the rotating plate 73 is received in the housing 72 and has a stop at the center. The rotation preventing coupling hole 731 has a rotation preventing coupling portion 732 which is formed corresponding to the appearance of the rotation preventing key 423. The rotating disk 73 is threaded over the screw 42 by the rotation preventing coupling hole 731. On the connecting section 421, and the rotation preventing joint 732 of the turntable 73 is combined with the stop key 423, so that the turntable 73 and The screw 42 is interlocked; one end of each of the centrifugal friction blocks 74 is a pivoting end 741, and the other end is a swinging end 742. The pivoting end 741 of the centrifugal friction block 74 is pivotally disposed on the turntable by a pivot 743. One side of the 73 has a first buttonhole 744, and each of the centrifugal friction blocks 74 is disposed around the rotation preventing coupling hole 731 and the screw 42 of the turntable 73, and each of the centrifugal friction blocks 74 is adjacent to the pivoting end 741. The swinging end 742 of the centrifugal friction block has a second buckle between the pivoting end 741 and the swinging end 742 of each of the centrifugal friction blocks 74. Each of the springs 75 is formed by a fastening hook portion 751 at both ends and an elastic ring portion 752 between the two ends, and the fastening hook portions 751 at the two ends of the spring 75 are respectively disposed on the centrifugal friction block 74. a first fastening hole 744 and a second fastening hole 745 of the adjacent centrifugal friction block 74; the positioning member 76 is a nut, and the positioning member 76 is locked to the locking portion 422 of the screw 42 and abuts against the rotating plate 73. one side.

The above is the structural configuration and features of the lifting device with the safety slow-down mechanism of the present invention, and the following is a description of its operation, which is driven by the driving source 41 of the driving unit 40 to rotate the screw 42 when the screw 42 rotates. When the nut 43 is linearly displaced on the screw 42, the nut 43 can simultaneously drive the driving frame 50 and the lifting platform 60 disposed on the driving frame 50 to move up and down; The descending unit 70 does not decelerate the screw 42. Only the turntable 73 of the descending unit 70 rotates with the screw 42, and each of the springs 75 maintains the normal pulling of each of the centrifugal friction blocks 74. At this time, Each of the springs 75 pulls the centrifugal friction block 74 by a pulling force greater than the centrifugal force generated by the rotation of each centrifugal friction block 74 with the turntable 73, so that each of the centrifugal friction blocks 74 maintains a normal state that is not in contact with the housing 72; When the lifting table 60 is in an abnormal state and is rapidly descending, the lifting platform 60 drives the driving frame 50 and the nut 43 to rapidly descend. The nut 43 drives the screw 42 to rotate rapidly. At this time, when the screw 42 rotates. When raised, the snail Ramping down unit 42 drives the turntable 73 is rotated 70 also increased at the same speed, when the rotation speed of the turntable 73 When the height is increased, the centrifugal force of the centrifugal friction block 74 on the turntable 73 is also increased synchronously. When the centrifugal force of each of the centrifugal friction blocks 74 is greater than the pulling force between the springs 75, the centrifugal force causes the centrifugal friction block 74 on the turntable 73 to be pulled. Each of the springs 75 is pulled outwardly, and each of the centrifugal friction blocks 74 pivots outwardly with the pivot 743 as a pivoting center, that is, while the swinging end 742 contacts and rubs the housing 72, the centrifugal friction blocks are respectively The friction between the 74 and the housing 72 can be reduced by friction, and the rotation speed of the screw 42 can be reduced, thereby reducing the descending speed of the lifting platform 60, ensuring that the lifting platform 60 can be decelerated and then lowered to the ground to avoid The safety situation caused by the rapid decrease of the lifting platform 60 is as follows. As can be seen from the above, the deceleration effect of the descending unit 70 is generated when the centrifugal force of each centrifugal friction block 74 is greater than the tensile force of each spring 75. When the speed of the deceleration action is changed by the descent unit 70, the weight of each of the centrifugal friction blocks 74 may be changed, or the spring constant of each spring 75 may be changed, and the end use end needs to be changed by itself; When the descending unit 70 is engaged with the driving mode of the screw 43 of the screw 42, in addition to the determination that the screw 42 is engaged with the driving of the nut 43, when the descent unit 70 decelerates the screw 42, it can be directly and surely generated. The deceleration action ensures the safety of the overall lifting device.

"Knowledge Technology"

10‧‧‧Safety descent device

11‧‧‧Base

12‧‧‧ shaft

13‧‧‧Speed wheel

14‧‧‧weight hitting pieces

A‧‧‧Safety cable

20‧‧‧Safety descent device

21‧‧‧Roller

22‧‧‧ Connecting rod

23‧‧‧Clutch unit

231‧‧‧ cabinet

232‧‧‧ rotating plate

233‧‧‧weight

234‧‧ ‧ spring

"this invention"

30‧‧‧Base

31‧‧‧Track Department

32‧‧‧Fixed Office

321‧‧‧Perforation

40‧‧‧ drive unit

41‧‧‧ drive source

42‧‧‧ screw

421‧‧‧ link segment

422‧‧‧Lock section

423‧‧‧stop button

43‧‧‧ Nuts

50‧‧‧Drive rack

51‧‧‧ Slider

60‧‧‧ lifting platform

70‧‧‧Descending unit

72‧‧‧Shell

721‧‧‧ first opening

722‧‧‧ second opening

73‧‧‧ Turntable

731‧‧‧Turn-over coupling hole

732‧‧‧Turn-over joint

74‧‧‧ Centrifugal friction block

741‧‧‧ pivot end

742‧‧‧Swing end

743‧‧‧ pivot

744‧‧‧First buttonhole

745‧‧‧Second buttonhole

75‧‧‧ Spring

751‧‧‧deduction hook

752‧‧‧Flexible circle

76‧‧‧ Positioning parts

Figure 1 is a schematic diagram of a safe descent device for use with a conventional cable.

Figure 2 is a schematic diagram of the safety descent device used in the conventional use of the roller.

Fig. 3 is a schematic view of a lifting device having a safety descent mechanism according to the present invention.

Fig. 4 is a partially exploded perspective view showing the lifting device of the present invention having a safety descent mechanism.

Figure 5 is a cross-sectional view showing a partial structure of a lifting device having a safety slow-down mechanism according to the present invention.

Fig. 6 is a cross-sectional view showing a part of a descending unit of a lifting device having a safety descent mechanism according to the present invention.

Fig. 7 is a schematic view showing the operation of the descending unit of the lifting device with the safety descending mechanism of the present invention.

30‧‧‧Base

32‧‧‧Fixed Office

321‧‧‧Perforation

421‧‧‧ link segment

42‧‧‧ screw

422‧‧‧Lock section

43‧‧‧ Nuts

50‧‧‧Drive rack

70‧‧‧Descending unit

72‧‧‧Shell

721‧‧‧ first opening

722‧‧‧ second opening

73‧‧‧ Turntable

74‧‧‧ Centrifugal friction block

76‧‧‧ Positioning parts

Claims (6)

A lifting device having a safety descent mechanism, comprising: a base having a fixed assembly portion; a driving unit comprising a driving source, a screw and a nut, wherein the driving source is fixedly disposed on the base The driving source drives one end of the screw, the nut is screwed to the screw; a driving frame is fixedly connected to the nut and can be linearly displaced into the base; and a lifting platform is fixedly connected to the driving a descending unit includes a casing fixedly disposed on one side of the fixed assembly, and the other end of the screw extends into the casing and has a locking section; a rotating disc is received in the casing and The screw is connected to the same; the plurality of centrifugal friction blocks surround the screw and are pivotally disposed on one side of the turntable, and the other side of the turntable is fixedly disposed with a positioning member, and the positioning member is locked to the locking portion; each of the centrifugal friction The blocks are each connected by a spring. The lifting device with a safety slow-down mechanism according to the first aspect of the invention, wherein the two sides of the base respectively have a rail portion, and the two sides of the driving bracket are respectively provided with a slider, the driving bracket The slider is correspondingly slidably disposed on the rail portion of the base. The lifting device with a safety descent mechanism according to claim 1, wherein the other end of the screw has a connecting section, the connecting section has a stop button, and the turntable center has a rotation stop combination a hole, the rotation preventing coupling hole has a rotation preventing joint which is formed corresponding to the appearance of the rotation stop key, the turntable The anti-rotation coupling hole is sleeved on the connecting section of the screw, and the rotation-stop joint of the turntable corresponds to the anti-rotation key joint, so that the turntable is co-operating with the screw. The lifting device of the base of claim 1, wherein the fixing assembly of the base has a through hole, and the two ends of the casing of the descending unit are respectively a first opening. And a second opening, the first opening of the housing communicates with the through hole, and the screw penetrates through the through hole of the fixing assembly and protrudes into the housing through the first opening of the housing. The lifting device of claim 1, wherein one end of each of the centrifugal friction blocks is a pivoting end, and the other end is a swinging end, and the pivoting end of the centrifugal friction block is a The pivot is pivotally disposed on one side of the turntable, and each of the centrifugal friction blocks is pivotally connected to the swing end of the adjacent centrifugal friction block. The lifting device of claim 5, wherein the pivoting end of each of the centrifugal friction blocks has a first fastening hole, and the pivoting end and the swinging end of each of the centrifugal friction blocks. There is a second buttonhole between each of the springs, and each of the springs is composed of a hook portion at both ends and an elastic ring portion between the two ends, and the hook portions at the ends of the spring are respectively set to be located in the centrifugal friction. a first buttonhole of the block and a second buttonhole of the adjacent centrifugal friction block.