CN211813257U

CN211813257U - Lifting platform

Info

Publication number: CN211813257U
Application number: CN201922314361.4U
Authority: CN
Inventors: 齐智慧; 王廷剑; 张韶山; 李光泽; 谢昌霖; 赵阳
Original assignee: Tianjin University of Technology and Education China Vocational Training Instructor Training Center; Beijing Power Machinery Institute
Current assignee: Tianjin University of Technology and Education China Vocational Training Instructor Training Center; Beijing Power Machinery Institute
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-10-30
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a lifting platform, which comprises at least two spiral lifting devices and a platform synchronously driven by the spiral lifting devices, wherein each spiral lifting device comprises a lead screw, a stepped nut, a stepped shaft, a pair of angular contact bearings, a sleeve, a gear, a bearing sleeve, an upper end cover and a lower end cover; the pair of angular contact bearings, the sleeve and the gear are sequentially arranged on each shaft section of the stepped shaft; the stepped shaft is provided with an annular boss, and the pair of angular contact bearings are arranged on two sides of the annular boss in a back-to-back manner; the bearing sleeve is sleeved on the pair of angular contact bearings; the upper end cover and the lower end cover are respectively in static connection with the upper end and the lower end of the bearing sleeve. The utility model discloses a spiral elevating gear carries through angular contact shaft transmission power, realizes rotary motion's isolation, does when reciprocating and rotatory as bearing unit, and rotary motion is offset to the angular contact bearing, and the bearing housing only is done and is reciprocated, has reduced bearing unit's loading, makes work more reliable.

Description

Lifting platform

Technical Field

The utility model relates to a by two at least spiral elevating gear synchronous drive's lift platform.

Background

With the increasing popularization of air conditioners, refrigerators, washing machines, automobiles and the like, the demand of household appliance sellers on heavy type household appliance intelligent access systems is increasing urgent; in addition, the problem of difficult parking of the automobile is increasingly highlighted, and the development of an intelligent access system of the automobile is urgently needed. For the design of intelligent storage and taking systems for heavy goods such as air conditioners, refrigerators, washing machines, automobiles and the like, how to improve the space utilization rate is the primary consideration, so that warehouses are usually designed into a three-dimensional multi-layer form, and the lifting of the heavy goods is realized through a lifting platform of a storage and taking device.

The nut screw rod screw device has a self-locking function, the lifting platform is synchronously driven by a plurality of nut screw rod screw pairs, the risk that the lifting platform automatically falls when the power is cut off accidentally can be avoided, the stress is more reasonable, and the lifting of the platform is more stable. The lifting of a common nut screw pair driving platform is realized by driving a nut which is in static connection with the platform to do lifting motion through the rotation of a driving screw, and for a heavy goods intelligent storage system, in order to improve the space utilization rate, the number of layers of a three-dimensional multilayer warehouse needs to be increased, so that the screw is large in size, heavy in weight and large in inertia. If the lead screw is adopted to rotate to drive the lifting platform to move up and down, the bearing for supporting the lead screw to rotate can bear the weight of the lead screw besides the weight of heavy goods and the lifting platform, so that the bearing is easy to bear overlarge load and lose efficacy, once the bearing loses efficacy, the whole system can not work, and the bearing which loses efficacy is inconvenient to replace, so that the economic cost is high. Therefore, the nut-screw pair which drives the nut to do lifting movement through the rotation of the screw cannot meet the driving requirement of the lifting platform of the heavy goods storing and taking system.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provide a by two at least spiral elevating gear synchronous drive's lift platform.

The technical purpose of the utility model is realized through the following technical scheme.

A lifting platform comprises at least two spiral lifting devices and a platform synchronously driven by the at least two spiral lifting devices;

the spiral lifting device comprises a screw rod, a stepped nut, a stepped shaft, a first angular contact bearing, a second angular contact bearing, a sleeve, a gear, a bearing sleeve, an upper end cover and a lower end cover, and the screw rod is vertically and fixedly installed; the stepped nut comprises an upper stepped nut part and a lower stepped nut part which are integrally formed, the outer diameter of the upper stepped nut part is larger than that of the lower stepped nut part, the stepped nut and the stepped shaft are sequentially sleeved on the lead screw from top to bottom, the stepped nut is in threaded connection with the lead screw, the inner wall of the stepped shaft is matched with the outer wall of the lower stepped nut part, and the upper stepped nut part is in static connection with the upper end of the stepped shaft; the outer peripheral surface of the stepped shaft forms two stages of annular steps, the diameter of the annular step at the lower part is smaller, and an annular boss is formed by outwards protruding the first annular step at the upper part; the sleeve and the gear are arranged on a second annular step close to the first annular step from top to bottom, and the gear is fixedly arranged; the first angular contact bearing and the second angular contact bearing are arranged on the stepped shaft, the first angular contact bearing is arranged on the annular boss, the second angular contact bearing is arranged between the lower end face of the annular boss and the sleeve, and the first angular contact bearing and the second angular contact bearing are in interference fit with the stepped shaft; the bearing sleeve is sleeved outside the first angular contact bearing and the second angular contact bearing, and the bearing sleeve is in small clearance fit with the first angular contact bearing and the second angular contact bearing; the upper end of the bearing sleeve extends outwards horizontally along the circumferential direction to form an annular mounting table; the upper end cover is sleeved on the upper part of the stepped nut and the stepped shaft and is fixedly connected with the upper end of the bearing sleeve; the lower end face of the upper end cover is provided with an upper end cover annular boss, the outer surface of the upper end cover annular boss and the inner hole of the bearing sleeve form shaft hole clearance fit, the lower end face of the upper end cover annular boss is contacted with the large end face of the outer ring of the first angle contact bearing, namely the lower end face of the upper end cover annular boss is contacted with the upper end face of the outer ring of the first angle contact bearing; the diameter of an inner hole of the upper end cover is larger than the outer diameters of the upper part of the stepped nut and the stepped shaft, and a gap exists between the shaft holes; the lower end cover is sleeved on the sleeve and is fixedly connected with the lower end of the bearing sleeve; the upper end surface of the lower end cover is provided with a lower end cover annular boss, an inner hole of a bearing sleeve on the outer surface of the lower end cover annular boss forms shaft hole clearance fit, and the upper end surface of the lower end cover annular boss is contacted with the large end surface of the outer ring of the second angular contact bearing, namely the upper end surface of the lower end cover annular boss is contacted with the lower end surface of the outer ring of the second angular contact bearing; the diameter of an inner hole of the lower end cover is larger than the outer diameter of the sleeve, and a gap exists between the shaft holes; the platform is provided with a through hole, an upper end cover of each spiral lifting device is arranged in the through hole, and the annular mounting platform of the bearing sleeve is fixedly connected with the bottom of the platform through screws/bolts.

Preferably, the upper part of the stepped nut is fixedly connected with the upper end of the stepped shaft through a screw/bolt; the upper end cover and the lower end cover are respectively fixedly connected with the upper end and the lower end of the bearing sleeve through screws/bolts.

In an embodiment of the present invention, the inner wall of the stepped nut is provided with a trapezoidal internal thread, which forms a transmission screw pair with the trapezoidal external thread on the screw rod.

In one embodiment of the present invention, the gear is axially fixed by a lock nut installed at the bottom end of the stepped shaft; the gear is connected with the stepped shaft through a key to be circumferentially fixed.

Preferably, the inner walls of the upper end cover and the lower end cover are respectively provided with an upper end cover felt ring mounting groove and a lower end cover felt ring mounting groove, and an upper sealing felt ring and a lower sealing felt ring for preventing dust from entering are respectively mounted in the upper end cover felt ring mounting groove and the lower end cover felt ring mounting groove.

Preferably, the platforms are driven synchronously by three of the spiral lifting devices.

The utility model discloses a theory of operation: when the spiral lifting device works, the screw rod is fixed, the step shaft and the step nut are driven to ascend and descend up and down along the axis of the fixed screw rod and rotate around the axis of the fixed screw rod through the rotation of the gear, a pair of angular contact bearings arranged back to back on the step shaft play a role in rotary isolation, the inner ring of the angular contact bearings ascends and descends and rotates along with the step shaft, and the outer ring of the angular contact bearings only ascends and descends along with the rolling of the inner rolling bodies, so that the bearing sleeve is driven to ascend and descend. With two or more the utility model discloses a spiral elevating gear passes through the screw/bolt and is connected with high load lift platform, then drives each spiral elevating gear's gear and does synchronous rotation, just can make high load lift platform steady lift from top to bottom.

The utility model has the advantages that: the utility model provides a spiral lifting device and a lifting platform provided with the device, the force load is transmitted among a stepped nut, a stepped shaft and a bearing sleeve of the spiral lifting device through a simple structure that two standard angular contact bearings are arranged back to back, the isolation of the rotary motion is realized, when the driving gear rotates to drive the stepped nut and the stepped shaft to do combined motion of up-and-down movement and rotation around the axis of the screw rod, because the angular contact bearing offsets the rotary motion around the axis of the screw rod, the bearing sleeve only moves up and down, the bearing part of the whole system only needs to bear the weight of heavy goods and the lifting platform, compared with a screw device which drives the lifting platform to move up and down by the rotation of the lead screw, the bearing does not need to bear the weight of the lead screw, the bearing load is reduced, thereby reducing the loss and the failure risk of the whole device, having more reliable work and lower economic cost; in addition, the screw between the stepped nut and the stepped shaft and the screw rod has a self-locking function, so that the falling vicious accident of the lifting platform can be avoided under the condition of sudden power failure.

Drawings

Fig. 1 is a schematic sectional view of a lifting platform provided with the spiral lifting device of the present invention;

fig. 2 is a schematic sectional structure view of the stepped nut of the present invention;

fig. 3 is a schematic sectional structure view of the stepped shaft of the present invention;

fig. 4 is a schematic sectional view of the upper end cap of the present invention;

fig. 5 is a schematic cross-sectional view of the lower end cap of the present invention.

Detailed Description

The invention will be further described with reference to the following specific embodiments and the accompanying drawings.

As shown in fig. 1 to 5, a lifting platform comprises at least two screw lifters and a platform 14 driven by the at least two screw lifters in synchronization. The spiral lifting device comprises a screw rod 1, a stepped nut 2, a stepped shaft 3, a first angular contact bearing 4a, a second angular contact bearing 4b, a sleeve 5, a gear 6, a bearing sleeve 9, an upper end cover 12 and a lower end cover 10, wherein the screw rod 1 is vertically and fixedly installed; the stepped nut 2 comprises an upper stepped nut portion 2-1 and a lower stepped nut portion 2-2 which are integrally formed, the outer diameter of the upper stepped nut portion 2-1 is larger than that of the lower stepped nut portion 2-2, the stepped nut 2 and the stepped shaft 3 are sequentially sleeved on the lead screw 1 from top to bottom, the stepped nut 2 is in threaded connection with the lead screw 1, the inner wall of the stepped shaft 3 is matched with the outer wall of the lower stepped nut portion 2-2, and the upper stepped nut portion 2-1 is in detachable static connection with the upper end of the stepped shaft 3 through a plurality of screws/bolts and elastic washers; the outer peripheral surface of the stepped shaft 3 forms two stages of annular steps, the diameter of the annular step at the lower part is smaller, and an annular boss 3-1 is formed by outwards protruding the first annular step at the upper part; the sleeve 5 and the gear 6 are arranged on a second annular step close to the first annular step from top to bottom, and the gear 6 is fixedly arranged; the first angular contact bearing 4a and the second angular contact bearing 4b are mounted on the stepped shaft 3, the first angular contact bearing 4a is arranged on the annular boss 3-1, the second angular contact bearing 4b is mounted between the lower end face of the annular boss 3-1 and the sleeve 5, and the first angular contact bearing 4a and the second angular contact bearing 4b are in interference fit with the stepped shaft 3; the bearing sleeve 9 is sleeved outside the first angular contact bearing 4a and the second angular contact bearing 4b, and the bearing sleeve 9 is in small clearance fit with the first angular contact bearing 4a and the second angular contact bearing 4 b; the upper end of the bearing sleeve 9 extends outwards horizontally along the circumferential direction to form an annular mounting table; the upper end cover 12 is sleeved on the upper part 2-1 of the stepped nut and the stepped shaft 3 and forms detachable static connection with the upper end of the bearing sleeve 9 through a plurality of screws/bolts and elastic washers; an upper end cover annular boss 12-1 is arranged on the lower end face of the upper end cover 12, the outer surface of the upper end cover annular boss 12-1 and an inner hole of the bearing sleeve 9 form shaft hole clearance fit, and the lower end face of the upper end cover annular boss 12-1 is in contact with the outer ring large end face of the first angle contact bearing 4 a; the diameter of an inner hole of the upper end cover 12 is larger than the outer diameters of the upper part 2-1 of the stepped nut and the stepped shaft 3, and a gap exists between shaft holes; the lower end cover 10 is sleeved on the sleeve 5 and is fixedly connected with the lower end of the bearing sleeve 9 through a plurality of screws/bolts and elastic washers; the upper end face of the lower end cover 10 is provided with a lower end cover annular boss 10-1, an inner hole of a bearing sleeve 9 on the outer surface of the lower end cover annular boss 10-1 forms shaft hole clearance fit, and the upper end face of the lower end cover annular boss 10-1 is contacted with the outer ring large end face of the second angular contact bearing 4 b; the diameter of the inner hole of the lower end cover 10 is larger than the outer diameter of the sleeve 5, and a gap exists between the shaft holes. A through hole is formed in the platform 14, the upper end cover 12 of each spiral lifting device is arranged in the through hole, and the annular mounting table of the bearing sleeve 9 is fixedly connected with the bottom of the platform 14 through screws/bolts.

The inner wall of the stepped nut 2 is provided with a trapezoidal internal thread which forms a transmission screw pair with the trapezoidal external thread on the screw rod 1.

The gear 6 is axially fixed through a locking nut 8 arranged at the bottom end of the stepped shaft 3; a key groove 3-3 is formed in the lower side of the stepped shaft 3, a key 7 is arranged in the key groove 3-3, and the gear 6 is connected with the stepped shaft 3 through the key 7 and is circumferentially fixed.

In addition, the inner walls of the upper end cover 12 and the lower end cover 10 are respectively provided with an upper end cover felt loop mounting groove 12-2 and a lower end cover felt loop mounting groove 10-2, and an upper sealing felt loop 13 and a lower sealing felt loop 11 for preventing dust from entering are respectively mounted in the upper end cover felt loop mounting groove 12-2 and the lower end cover felt loop mounting groove 10-2.

Usually, the platform 14 is synchronously driven by three spiral lifting devices, and a plurality of spiral lifting devices can be arranged according to actual needs.

The working principle of the utility model is as follows:

when the spiral lifting device works, the screw rod 1 is fixed, the step shaft 3 and the step nut 2 are driven to lift up and down along the axis of the fixed screw rod 1 and rotate around the axis of the fixed screw rod 1 through the rotation of the gear 6, a pair of

angular contact bearings

4a and 4b which are arranged back to back on the step shaft 3 play a role in rotary isolation, the inner ring of the angular contact bearings performs up-and-down lifting and rotating movement along with the step shaft 3, and the outer ring of the angular contact bearings only performs up-and-down lifting movement along with the inner steel balls due to the rolling of the inner steel balls, so that the bearing sleeve 9 is driven. With two or more the utility model discloses a spiral elevating gear passes through the screw/bolt and is connected with high load lift platform, then drives each spiral elevating gear's gear and does synchronous rotation, just can make high load lift platform steady lift from top to bottom.

The utility model discloses a spiral elevating gear's step nut, the simple structure transmission power that installs back to back through two standard angular contact bearings is carried between step shaft and the bearing housing, rotary motion's isolation has been realized, when drive gear rotation drive step nut and step shaft do the combined motion of reciprocating and rotation around the lead screw axis, because angular contact bearing has offset the rotary motion around the lead screw axis, the bearing housing is the motion of reciprocating only, compare with the screw that lead screw rotation drive lift platform up-and-down motion, the bearing part of system only need bear the weight of heavy goods and elevating platform, need not to bear the weight of lead screw, the load of bearing has been reduced, thereby the loss of whole device and the risk of inefficacy have been reduced, work is more reliable, economic cost is lower; in addition, the screw between the stepped nut and the stepped shaft and the screw rod has a self-locking function, so that the falling vicious accident of the lifting platform can be avoided under the condition of sudden power failure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting platform, its characterized in that: comprises at least two spiral lifting devices and a platform (14) synchronously driven by the at least two spiral lifting devices;

the spiral lifting device comprises a screw rod (1), a stepped nut (2), a stepped shaft (3), a first angular contact bearing (4a), a second angular contact bearing (4b), a sleeve (5), a gear (6), a bearing sleeve (9), an upper end cover (12) and a lower end cover (10);

the lead screw (1) is vertically and fixedly installed;

the stepped nut (2) comprises an upper stepped nut portion (2-1) and a lower stepped nut portion (2-2) which are integrally formed, the outer diameter of the upper stepped nut portion (2-1) is larger than that of the lower stepped nut portion (2-2), the stepped nut (2) and the stepped shaft (3) are sequentially sleeved on the screw rod (1) from top to bottom, the stepped nut (2) is in threaded connection with the screw rod (1), the inner wall of the stepped shaft (3) is matched with the outer wall of the lower stepped nut portion (2-2), and the upper stepped nut portion (2-1) is in static connection with the upper end of the stepped shaft (3);

the outer peripheral surface of the stepped shaft (3) forms two stages of annular steps, the diameter of the annular step at the lower part is smaller, and an annular boss (3-1) is formed by outwards protruding the first annular step at the upper part; the sleeve (5) and the gear (6) are arranged on a second annular step close to the first annular step from top to bottom, and the gear (6) is fixedly arranged;

the first angular contact bearing and the second angular contact bearing (4a and 4b) are mounted on the stepped shaft (3), the first angular contact bearing (4a) is arranged on the annular boss (3-1), the second angular contact bearing (4b) is mounted between the lower end face of the annular boss (3-1) and the sleeve (5), and the first angular contact bearing and the second angular contact bearing (4a and 4b) are in interference fit with the stepped shaft (3);

the bearing sleeve (9) is sleeved outside the first angular contact bearing (4a) and the second angular contact bearing (4b), and the bearing sleeve (9) is in small clearance fit with the first angular contact bearing (4a) and the second angular contact bearing (4 b); the upper end of the bearing sleeve (9) extends outwards and horizontally along the circumferential direction to form an annular mounting table;

the upper end cover (12) is sleeved on the upper part (2-1) of the stepped nut and the stepped shaft (3) and is fixedly connected with the upper end of the bearing sleeve (9); an upper end cover annular boss (12-1) is arranged on the lower end face of the upper end cover (12), the outer surface of the upper end cover annular boss (12-1) and an inner hole of the bearing sleeve (9) form shaft hole clearance fit, and the lower end face of the upper end cover annular boss (12-1) is in contact with the large end face of the outer ring of the first angle contact bearing (4 a); the diameter of an inner hole of the upper end cover (12) is larger than the outer diameters of the upper part (2-1) of the stepped nut and the stepped shaft (3), and a gap exists between the shaft holes;

the lower end cover (10) is sleeved on the sleeve (5) and is fixedly connected with the lower end of the bearing sleeve (9); the upper end face of the lower end cover (10) is provided with a lower end cover annular boss (10-1), an inner hole of a bearing sleeve (9) on the outer surface of the lower end cover annular boss (10-1) forms shaft hole clearance fit, and the upper end face of the lower end cover annular boss (10-1) is in contact with the large end face of the outer ring of the second angular contact bearing (4 b); the diameter of an inner hole of the lower end cover (10) is larger than the outer diameter of the sleeve (5), and a gap exists between shaft holes;

the platform (14) is provided with a through hole, an upper end cover (12) of each spiral lifting device is arranged in the through hole, and an annular mounting table of the bearing sleeve (9) is fixedly connected with the bottom of the platform (14) through screws.

2. The lift platform of claim 1, wherein: the inner wall of the stepped nut (2) is provided with a trapezoidal internal thread which forms a transmission screw pair with the trapezoidal external thread on the screw rod (1).

3. The lift platform of claim 1, wherein: the gear (6) is axially fixed through a locking nut (8) arranged at the bottom end of the stepped shaft (3).

4. The lift platform of claim 1, wherein: a key groove (3-3) is formed in the lower side of the stepped shaft (3), a key (7) is arranged in the key groove (3-3), and the gear (6) is connected with the stepped shaft (3) through the key (7) and is circumferentially fixed.

5. The lift platform of claim 1, wherein: the upper part (2-1) of the stepped nut is fixedly connected with the upper end of the stepped shaft (3) through a screw.

6. The lift platform of claim 1, wherein: the upper end cover (12) and the lower end cover (10) are respectively fixedly connected with the upper end and the lower end of the bearing sleeve (9) through screws.

7. The lift platform of claim 1, wherein: the inner walls of the upper end cover (12) and the lower end cover (10) are respectively provided with an upper end cover felt ring mounting groove (12-2) and a lower end cover felt ring mounting groove (10-2), and an upper sealing felt ring (13) and a lower sealing felt ring (11) for preventing dust from entering are respectively arranged in the upper end cover felt ring mounting groove (12-2) and the lower end cover felt ring mounting groove (10-2).

8. The elevating platform as set forth in any one of claims 1-7, wherein: the platform (14) is synchronously driven by the three spiral lifting devices.