A vertical lifting rolling screw device for up and down movement

Abstract

The present invention discloses a vertical lifting rolling screw device for up and down operation, comprising a vertical lead screw 1 and a driving large nut 2; the vertical lead screw 1 is processed with a rectangular thread 11; the driving large nut 2 is evenly distributed with mounting holes 22 on the spiral line 21 corresponding to the rectangular thread on the vertical lead screw surface, each mounting hole 22 is equipped with a roller screw unit 23, and the roller screw unit 23 comprises a central shaft 231, the inner end of the central shaft 231 is fixedly equipped with a roller bearing 232, and the outer end thereof is screwed with a locking small nut 233 after passing through the mounting hole 22 through interference fit; the driving large nut 2 is screwed on the vertical lead screw 1, and a disc-type hollow torque motor 3 is mounted on the vertical lead screw 1, and one end of the output shaft is fixedly connected to the driving large nut 2 through a coupling. The present invention improves the screw driving mode of the vertical lifting elevator, reduces energy consumption, simplifies the driving structure, and saves manufacturing and operating costs.

Description

Technical Field

[0001] The invention relates to the field of vertical lifting equipment, in particular to a vertical lifting rolling screw device used for up and down movement. Background Art

[0002] An elevator is a permanent transportation device that serves several specific floors in a building and whose car runs on at least two rows of rigid tracks that are perpendicular to the horizontal plane or have an inclination angle of less than 15° to the plumb line.

[0003] There are mainly the following driving modes for elevators:

[0004] 1. AC elevator, an elevator that uses an AC induction motor as a driving force. According to the traction method, it can be divided into AC single speed, AC double speed, AC voltage regulation and speed regulation, AC variable voltage and frequency regulation, etc., and is pulled by a steel wire rope.

[0005] 2. DC elevator, which uses a DC motor as the driving force. The rated speed of this type of elevator is generally above 2.00m / s.

[0006] 3. Hydraulic elevator, which generally uses an electric pump to drive the flow of liquid, and the plunger to raise and lower the car.

[0007] 4. Rack and pinion elevator: the guide rail is processed into a rack, the car is equipped with a gear that meshes with the rack, and the motor drives the gear to rotate to raise and lower the car.

[0008] 5. Screw elevator: the plunger of the straight-top elevator is processed into a rectangular thread, and then a large nut with a thrust bearing is installed on the top of the cylinder. The nut is then driven to rotate by a motor through a reducer (or belt), thereby causing the screw to lift the car up or down.

[0009] 6. The power source of the elevator driven by a linear motor is the linear motor.

[0010] For screw elevators, such as Figure 5 As shown, its driving components mainly include a fixed vertical screw 501, on which a traditional large driving nut is provided, and the large driving nut is assembled on a platform longitudinal assembly 502, and an AC motor is assembled on the platform longitudinal assembly 502 to drive the large nut to rotate through a transmission mechanism. A platform transverse assembly 503 is assembled on the platform longitudinal assembly 502, and the car is installed on the platform transverse assembly 503. The large driving nut provides an axial load, and the motor realizes the up and down movement of the car.

[0011] Compared with common AC elevators pulled by steel wire ropes, screw elevators are very stable and accurate in operation, and there is no shaking when reaching the designated floor. However, screw elevators consume a lot of energy during operation, have a relatively complex structure, and are expensive. Summary of the invention

[0012] In view of the problems of complex structure and high energy consumption of existing screw elevators, the purpose of the present invention is to provide a vertical lifting rolling screw device for up and down movement, which is applied to the driving part of the screw elevator.

[0013] The present invention is achieved by adopting the following technical solutions:

[0014] The utility model relates to a vertical lifting rolling screw device used for up and down movement, comprising a vertical lead screw and a large driving nut.

[0015] The surface of the vertical lead screw is processed with rectangular threads.

[0016] The large driving nut is evenly distributed with mounting holes on the spiral line corresponding to the rectangular thread on the surface of the vertical screw, and a roller screw unit is installed in each mounting hole. The roller screw unit includes a central shaft, and a roller bearing is fixedly installed on the inner end of the central shaft, and a locking small nut is screwed on the outer end after passing through the mounting hole through an interference fit.

[0017] The driving large nut is screwed onto the vertical lead screw, that is, the roller bearing of each roller screw unit on the driving large nut is correspondingly located in the rectangular thread of the vertical lead screw.

[0018] A disc-type hollow torque motor is mounted on the vertical lead screw, and one end of the output shaft of the disc-type hollow torque motor is fixedly connected to a large driving nut through a coupling.

[0019] Further preferably, a protective nut is screwed on the vertical screw, and the other end of the output shaft of the disc-type hollow torque motor is fixedly connected to the protective nut through a coupling, and there is a clearance fit between the thread of the protective nut and the rectangular thread of the vertical screw.

[0020] When working, it is necessary to lift or lower, the disc-type hollow torque motor is started, and the driving large nut rotates along the vertical lead screw to rise or fall. There is rolling friction between the driving large nut and the vertical lead screw, which greatly reduces the resistance caused by traditional sliding friction; and the driving large nut also has a large axial load force, so the driving large nut is used as an axial driving component for the lifting platform to rise or fall. In this process, the disc-type hollow torque motor also drives the protection nut at the other end to rotate and rise or fall. The protection nut is an ordinary traditional nut with a rectangular convex thread. Since there is a clearance fit between the thread of the protection nut and the rectangular thread of the vertical lead screw, that is, the thread of the protection nut does not directly contact the rectangular thread of the vertical lead screw during the rising or falling process, but only follows the lifting or falling, and does not consume the output torque of the disc-type hollow torque motor. Only in an abnormal emergency situation, if most of the roller screw units of the driving large nut are broken and the driving large nut loses the axial force, the protection nut will be in close contact with the vertical lead screw at this time to provide axial support force again to prevent the lifting platform from falling rapidly.

[0021] The present invention has the following advantages:

[0022] 1. The "convex thread" in the driving large nut is formed by a roller bearing, which changes the cooperation between the nut and the lead screw from traditional sliding friction to rolling friction, greatly reducing the running resistance of the nut on the lead screw, reducing the output power of the driving motor, and saving energy and reducing emissions.

[0023] 2. A disc-type hollow torque motor is used instead of a traditional motor. The advantage of this disc-type hollow torque motor is that it can be directly hoisted under the driving large nut and mounted on the vertical screw, which greatly saves the assembly space and simplifies the device structure, reducing the manufacturing cost. Moreover, the motor does not need to use the transmission mechanism to act on the driving large nut to operate, thereby improving the transmission efficiency.

[0024] The invention has reasonable design, improves the screw driving mode of the vertical lifting elevator, reduces energy consumption, simplifies the driving structure, saves manufacturing and operating costs, and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An overall schematic diagram showing a vertical lifting rolling screw device.

[0026] Figure 2 Schematic diagram showing the cooperation between the vertical lead screw and the large driving nut.

[0027] Figure 3 express Figure 2 Schematic diagram of the structure of the roller screw unit with part A enlarged.

[0028] Figure 4 It shows the external schematic diagram of the driving large nut.

[0029] Figure 5 A schematic diagram showing the driving mode of an existing screw elevator.

[0030] In the figure: 1-vertical screw, 11-rectangular thread, 2-large driving nut, 21-spiral wire, 22-mounting hole, 23-roller screw unit, 231-center shaft, 232-roller bearing, 233-locking small nut, 3-disc hollow torque motor, 4-protective nut; 501-screw, 502-platform longitudinal assembly, 503-platform transverse assembly. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] A vertical lifting rolling screw device used for up and down movement, such as Figure 1 As shown, it includes a vertical screw 1, on which a large driving nut 2, a disc-type hollow torque motor 3 and a protective nut 4 are assembled.

[0033] like Figure 2 As shown, a rectangular thread 11 is processed on the surface of the vertical screw 1, that is, the thread profile is square or rectangular, and the thread thickness and pitch are determined according to actual needs.

[0034] like Figure 4 As shown, the driving nut 2 is provided with mounting holes 22 evenly distributed along the spiral line 21 corresponding to the rectangular thread on the surface of the vertical screw, and each mounting hole 22 is equipped with a roller screw unit 23. Figure 3 As shown, the roller screw unit 23 includes a central shaft 231, the inner end of which is fixedly equipped with a roller bearing 232, and the outer end of which is inserted through the mounting hole 22 by interference fit and then screwed with a small locking nut 233, the function of which is to further securely assemble the roller bearing 232. In actual application, the outer surface of the driving large nut 2 has an embedded groove located in each mounting hole 22, and the small locking nut 233 can be embedded in the embedded groove on the surface of the driving large nut 2, making the appearance of the driving large nut relatively neat.

[0035] Among them, all the roller bearings 232 on the inner surface of the driving large nut 2 are arranged closely to form the "convex thread" of the driving large nut 2. The roller bearing 232 can withstand a large radial load, and its shaft neck is in circumferential contact with many rollers usually mounted on the positioning ring when rotating. The roller bearing can achieve good accuracy and rigidity through pre-tightening, and according to different use occasions, a bearing without an inner ring or a roller (needle roller) and a cage assembly can be selected. At this time, the shaft neck surface and the shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure that the load capacity and operating performance are the same as those of the bearing with a ring, the hardness, processing accuracy and surface quality of the shaft or shell hole raceway surface should be similar to those of the bearing ring raceway.

[0036] like Figure 2 As shown, the driving nut 2 is screwed onto the vertical screw 1 , that is, the roller bearing 232 of each roller screw unit 23 on the driving nut 2 is correspondingly located in the rectangular thread 11 of the vertical screw 1 .

[0037] like Figure 1 As shown, a disc-type hollow torque motor 3 is mounted on the vertical screw 1, and one end of the (hollow) output shaft of the disc-type hollow torque motor 3 is fixedly connected to the driving large nut 2 through a coupling; a traditional protective nut 4 is screwed on the vertical screw 1, and the other end of the (hollow) output shaft of the disc-type hollow torque motor 3 is also fixedly connected to the protective nut 4 through a coupling, and there is a clearance fit between the thread of the protective nut 4 and the rectangular thread 11 of the vertical screw 1, for example: the clearance distance between the thread of the protective nut 4 and the rectangular thread 11 of the vertical screw 1 is 2~5mm.

[0038] Moreover, the disc-type hollow torque motor 3 can be installed below or above the driving large nut 2 .

[0039] As a vertical lifting device, the present invention has the following working principle: the output shaft of the disk-type hollow torque motor 3 outputs power at a constant torque instead of a constant power, and can provide a stable torque to the load. When it is necessary to lift or lower, the disk-type hollow torque motor 3 is started, and the driving large nut 2 rotates to rise or fall accordingly. Since the "convex thread" of the driving large nut 2 is composed of a roller bearing 232, and there is rolling friction between the roller bearing 232 and the rectangular thread 11 of the vertical lead screw 1, the driving large nut 2 can easily rise or fall along the vertical lead screw 1. Under the same vertical load, compared with the ordinary driving large nut, the disk-type hollow torque motor 3 can output a smaller torque to make the driving large nut rise or fall; moreover, the roller bearing 232 can withstand a large radial load, and a large number of roller bearings 232 constitute the "rectangular convex thread" of the driving large nut 2, which ensures that the driving large nut 2 has a large axial load force, so that the driving large nut 2 is used as an axial driving component to lift the axial lifting platform up or down. During this process, the disc-type hollow torque motor 3 also drives the protective nut 4 at the other end to rotate up or down. The protective nut 4 is an ordinary nut with a rectangular thread. Since the thread of the protective nut 4 and the rectangular thread 11 of the vertical screw 1 are clearance-fitted, that is, the thread of the protective nut 4 does not contact the rectangular thread 11 of the vertical screw 1 during the rising or falling process, but only follows up to rise or fall, and does not consume the output torque of the disc-type hollow torque motor 3. A torque sensor can be installed between the other end of the output shaft of the disc-type hollow torque motor 3 and the protective nut 4. Under normal circumstances, contact occurs between the thread of the protective nut 4 and the rectangular thread of the vertical screw 1. The friction contact will inevitably increase the output power (torque consumption) of the disc-type hollow torque motor 3. By setting the torque sensor, when it is greater than a certain threshold, it is judged that the protective nut 4 is not working properly and needs to be repaired. Only in an abnormal emergency situation, if the majority of roller screw units 23 driving the large nut 2 are broken and the driving large nut 2 loses axial force, the protective nut 4 will drop 2 to 5 mm and come into direct and close contact with the vertical screw 1, thereby providing axial support force again and preventing the lifting platform from falling rapidly.

[0040] In addition, the protective nut 4 does not have to be assembled on the disc-type hollow torque motor 3. The protective nut 4 can also be fixedly connected to the driving large nut 2. Similarly, there is a clearance fit between the thread of the protective nut 4 and the rectangular thread 11 of the vertical screw 1. In this way, the protective nut 4 is driven by the driving large nut 2 to rise or fall with the driving large nut 2, but does not provide axial force. Only when the driving large nut 2 loses the axial force, the protective nut 4 will contact the vertical screw 1 to provide axial force.

[0041] When applied, the present invention can be used as a driving mechanism for a vertical elevator, and the elevator car can be driven by the large nut to achieve stable up and down movement, and extreme situations can be prevented from occurring by protecting the nut.

[0042] It should be pointed out that a person skilled in the art can make several improvements and applications without departing from the principles of the present invention, and these improvements and applications are also considered to be within the protection scope of the present invention.

Claims

1. A vertical lifting rolling screw device for up and down movement, characterized in that: It is composed of a vertical lead screw (1), a large driving nut (2), a roller screw unit (23), a disc-type hollow torque motor (3), and a protective nut (4); The surface of the vertical lead screw (1) is processed with a rectangular thread (11); The large driving nut (2) is evenly distributed with mounting holes (22) along the spiral line (21) corresponding to the rectangular thread on the surface of the vertical lead screw, and a roller screw unit (23) is installed in each mounting hole (22). The roller screw unit (23) comprises a central shaft (231), a roller bearing (232) is fixedly installed at the inner end of the central shaft (231), and a small locking nut (233) is screwed on the outer end after passing through the mounting hole (22) through an interference fit; The driving large nut (2) is screwed onto the vertical lead screw (1), that is, the roller bearing (232) of each roller screw unit (23) on the driving large nut (2) is correspondingly located in the rectangular thread (11) of the vertical lead screw (1); The vertical screw (1) is provided with a disc-type hollow torque motor (3), and one end of the output shaft of the disc-type hollow torque motor (3) is fixedly connected to the large driving nut (2) via a coupling; A protective nut (4) is screwed onto the vertical lead screw (1); the other end of the output shaft of the disk-type hollow torque motor (3) is fixedly connected to the protective nut (4) via a coupling; a torque sensor is installed between the other end of the output shaft of the disk-type hollow torque motor (3) and the protective nut (4); a clearance fit is formed between the thread of the protective nut (4) and the rectangular thread (11) of the vertical lead screw (1); and the clearance distance is 2 to 5 mm; The small locking nut (233) is embedded in the surface of the large driving nut (2).

2. A vertical lifting rolling screw device for up and down movement according to claim 1, characterized in that: The disc-type hollow torque motor (3) is installed below or above the driving large nut (2).

3. A vertical lifting rolling screw device for up and down movement according to claim 1, characterized in that: A protective nut (4) is screwed onto the vertical lead screw (1), the protective nut (4) is fixedly connected to the large driving nut (2), and a clearance fit is formed between the thread of the protective nut (4) and the rectangular thread (11) of the vertical lead screw (1).

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