CN210884810U

CN210884810U - Power transmission structure of household platform elevator

Info

Publication number: CN210884810U
Application number: CN201921859437.5U
Authority: CN
Inventors: 钱昕; 杨自强; 王冠文; 钱琴; 杨静; 廖国栋; 吴枝远; 练胜
Original assignee: Suzhou Wood Elevator Co ltd
Current assignee: Suzhou Wood Elevator Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-30
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a power transmission structure of domestic platform elevator, connect the linkage with driving motor and driving nut homogeneous phase, this power transmission structure includes the drive belt very much, first band pulley and biasing axle subassembly, wherein first band pulley key joint is in the coaxial follow-up commentaries on classics of driving motor output shaft, the biasing axle subassembly has connect the bearing frame based on the integrative dress of biasing bottom plate, the biasing axle, encoder and second band pulley, the biasing axle, the driving motor output shaft distributes in driving nut's both sides and equal axial direction parallel, the drive belt cup joints in first band pulley and second band pulley closed loop and rotates and the drive belt and press in the both sides transmission power of driving nut axial direction central symmetry. Use utility model's power transmission structure, improved the drive belt towards drive nut's the position of pressing under guarantee power transmission's prerequisite through addding the biasing axle subassembly, eliminated completely and leaded to the crooked external force of drive nut axial, be favorable to prolonging drive nut life and dimension guarantee cycle to improve elevator running noise and body and feel.

Description

Power transmission structure of household platform elevator

Technical Field

The utility model relates to a screw nut driven domestic platform elevator especially relates to a power transmission construction improvement of domestic platform elevator, belongs to electromechanical application technical field.

Background

With the advance of urbanization construction, the living standard and the construction technology of people are continuously improved, and buildings with various heights emerge around people in a large number. The skyscraper with high rise and cloud penetration, the skyscraper with various commercial and transportation hubs and wide occupied areas, the residential and office buildings with different layers and layer height division, and the like bring social development and prosperous life feeling to people in appearance and interior decoration. In various housing buildings, villas, gerocomiums, subways, hospitals and other special passages, in order to solve the problem that old people or people with leg and foot failures go upstairs and downstairs inconveniently, a relatively small home elevator is often needed.

At present, the household elevator mainly adopts several forms of traction drive, hydraulic drive, screw and nut drive and the like. Although the traction drive elevator is dominant in the market, the traction elevator generally needs counterweight blocks to balance the weight of the car, and car guide rails, counterweight guide rails and counterweight irons need to be additionally arranged in a hoistway, so that the utilization rate of the car is low. Therefore, for the villa with relatively few floors, the practicability of the screw nut driving elevator is stronger.

Along with the increasing popularization of screw nut drive elevators, the faults reported in application are also increased, and the classification conclusion finds that due to the bias of a drive motor and the traditional unilateral transmission design, the tension (radial direction) of a transmission belt to a nut is only deviated to one side, the contact pressure of the drive nut and a screw in a radial plane is unbalanced, the drive nut is easy to generate irreversible and continuous serious abrasion and axial deflection after a long time, so that the operation noise of the elevator is increased, and the maintenance period is shorter.

Disclosure of Invention

The utility model aims at providing a power transmission structure of domestic platform elevator, guarantee drive nut's axial stability, extension dimension guarantee period in the operation of high efficiency transmission power drive elevator lift.

The utility model provides a technical solution who realizes above-mentioned purpose is, a power transmission structure of domestic platform elevator, meets the linkage with driving motor and drive nut homogeneous phase, wherein driving motor connects based on elevator drive frame location dress, drive nut cup joints in the controlled rotation of screw rod, its characterized in that: the power transmission structure comprises a transmission belt, a first belt wheel and a bias shaft assembly, wherein the first belt wheel is connected to an output shaft of a driving motor in a keyed mode and rotates coaxially, a bearing seat, a bias shaft, an encoder and a second belt wheel are integrally installed on the bias shaft assembly based on a bias bottom plate, the bias shaft and the output shaft of the driving motor are distributed on two sides of a driving nut and are axially parallel, the transmission belt is sleeved on the first belt wheel and the second belt wheel in a closed-loop rotation mode, and the transmission belt is pressed against two sides of the driving nut in axial central symmetry mode to transmit power.

In the power transmission structure of the household platform elevator, the offset bottom plate and the bearing seat integrally connected in the offset shaft assembly are fixedly connected with the elevator driving frame, the offset shaft penetrates through a pair of ball bearings which are distributed in the bearing seat in a height direction and axially positioned, the second belt wheel is connected to the top of the offset shaft in a keyed mode and coaxially rotates with the top of the offset shaft, and the encoder is connected to the bottom of the offset shaft in a sleeved mode and tracks the rotating speed.

In the power transmission structure of the household platform elevator, furthermore, the shell of the encoder is connected to the elevator driving frame through the S-shaped spring sheet to be radially stopped and has a flexible tracking space which is in accordance with the axial deflection jitter of the offset shaft.

The power transmission structure of the household platform elevator is characterized in that the driving nut is integrally connected with the elevator driving frame based on the driving bottom plate, the driving bottom plate is connected with more than one set of tensioning wheel assembly matched and abutted with the transmission belt, and the transmission belt is pressed and gathered towards the three-axis coplane on one side of the driving nut facing the offset shaft, one side facing the output shaft of the driving motor or the side facing the two shafts.

Above-mentioned power transmission structure of domestic platform elevator, further, the tensioning wheel subassembly two sets become one pair of branch and locate the drive belt outside of the arbitrary side direction of drive nut, is equipped with self-aligning ball bearing between tensioning axle and the tensioning foreign steamer in every tensioning wheel subassembly.

In the power transmission structure of the household platform elevator, the transmission belt is a multi-wedge belt with a plurality of length-direction extending grooves on the inner side surface, and the circumferential outer surfaces of the first belt wheel, the second belt wheel and the driving nut are multi-wedge belt wheels which are matched and meshed with the transmission belt.

In the power transmission structure of the household platform elevator, the top side of the driving nut is provided with a brake for releasing and applying radial braking force, and the offset shaft assembly, the driving motor output shaft, the first belt pulley and the transmission belt are all stopped in the braking state of the driving nut.

In the power transmission structure of the household platform elevator, furthermore, the brake is provided with a brake body, an electromagnetic coil, a spring and a brake disc with a friction plate, wherein the brake body is connected with the brake base plate, the electromagnetic coil is connected with the brake disc, the brake disc is connected with the brake base plate through an external spline sleeve, a cross slide block and a driving nut in a transmission mode, the brake disc rotates synchronously, the electromagnetic coil overcomes the spring; and when the electromagnetic coil is in a power-off state, the spring is tensioned, and the brake disc is in contact friction stop with the brake bottom plate.

In the power transmission structure of the household platform elevator, further, a gap capable of radially displacing and compensating for axial inclination is reserved at the joint of the crosshead shoe and the external spline sleeve.

Use the utility model discloses a power transmission structure possesses outstanding substantive characteristics and the progressive nature that is showing: this design has improved the drive belt towards the position of pressing of drive nut through addding the biasing axle subassembly under the prerequisite of guarantee power transmission, has eliminated completely and has leaded to the crooked external force of drive nut axial, is favorable to improving the cooperation precision of drive nut and screw rod, reduces wearing and tearing and prolongs drive nut life and dimension guarantee period to improve elevator running noise and body and feel.

Drawings

Fig. 1 is a schematic view of a power transmission perspective structure of a household platform elevator of the present invention.

Fig. 2 is a schematic perspective view of another angle of the power transmission of the domestic platform elevator of the present invention.

Fig. 3 is a schematic vertical axial sectional view of the power transmission structure of the present invention.

Fig. 4 is a schematic horizontal sectional view of the power transmission structure of the present invention.

Fig. 5 is an axial sectional view of the tension wheel assembly in the power transmission structure of the present invention.

Detailed Description

The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp, and thus make a clearer definition of the protection scope of the present invention.

The utility model discloses the designer is felt not enough to current home use elevator practicality, and the home use platform elevator that especially independent villa used causes that drive nut wearing and tearing speed is too fast, elevator operation noise is obvious because the power transmission structure is unreasonable, needs the maintenance of regularity. The power transmission structure of the household platform elevator is innovatively provided through structural improvement, so that on one hand, high power transmission efficiency from a driving motor to a driving nut is maintained, on the other hand, the driving nut is kept in alignment and is coaxial with a screw, and abnormal wear of a degrading thread and noise generated by abnormal wear are eliminated.

As seen from the structural overview of the preferred embodiment of the present invention shown in fig. 1, 2, 3 and 4, the power transmission structure of the home platform elevator is linked with the driving motor 1 and the driving nut 2, wherein the driving motor 1 is positioned and connected based on the driving frame of the elevator (the conventional necessary structure of this type of elevator, not shown), and the driving nut 2 is sleeved on the screw rod 3 and is driven by power to rotate. The outline characteristics of the power transmission structure are as follows: the structure mainly comprises three parts of a transmission belt 41, a first belt wheel 42 and a biasing shaft assembly 43, wherein the first belt wheel 42 is keyed on an output shaft of a driving motor 1 to rotate coaxially; the above-described configuration of the offset shaft assembly 43 is summarized as that the bearing seat 431, the offset shaft 433, the encoder 435, and the second pulley 434 are integrally attached to the offset base plate 82. As the main features of the difference from the conventional structure, the offset shaft 433 and the output shaft of the driving motor are distributed on both sides of the driving nut 2 and are axially parallel, and the driving belt 41 is sleeved on the first belt pulley 42 and the second belt pulley 434 to rotate in a closed loop, and the driving belt 41 is pressed against both sides of the driving nut 2 which are axially and centrally symmetric to transmit power. The wrapping effect of the transmission belt is as shown in fig. 4, and the offset shaft and the output shaft of the driving motor are respectively arranged at the left side and the right side of the driving nut, so that the pressing area of the wrapped transmission belt to the driving nut is an arc section at the front side and the rear side. Because the tensile force of drive belt full length to the each point is even, consequently compare in the transmission of traditional unilateral drive belt, the utility model discloses the drive belt of this power transmission structure is not but doubles the effect of pressing of drive nut, more does benefit to power transmission, can make moreover to offset relatively to the front and back of the crooked external force of drive nut axial. Therefore, the improvement of the power transmission structure effectively overcomes the lateral dragging force of the traditional power transmission mode on the driving nut, and fundamentally improves the stability of the driving nut receiving the axial rotation of the driving force.

In view of further refinement of features, the primary function of the offset base plate 82 (simplified illustration) and its integrally attached bearing seat in the offset axle assembly described above is to axially position the offset axle to stabilize the power transmission effect of the drive belt. Therefore, the offset bottom plate and the bearing seat are connected with the elevator driving frame, namely are equivalently fixed with the driving motor. The offset shaft 433 is penetrated and connected in the bearing seat 431 and axially positioned in a pair of ball bearings 432 distributed in the height direction, the second belt wheel 434 is in key joint with the top of the offset shaft 433 to coaxially rotate along with the top of the offset shaft 433 and provides a closed loop support for a transmission belt corresponding to the first belt wheel on the other side of the drive nut, thereby releasing the support function of the drive nut.

To complete the functionality of the offset shaft assembly, such as monitoring the rotational speed of the drive belt in real time and sensing belt slip or breakage in depth, the offset shaft assembly is optionally equipped with an encoder and is sleeved on the bottom of the offset shaft to track the rotational speed. According to the working principle of the encoder, the body of the encoder needs to be ensured not to rotate, and the internal rotating speed is detected by sleeving a bias shaft through a rubber ring or a silicone tube. The optional encoder is ZKT-D00 of Limonitum, or EB100P of Yike electronics.

In a general power transmission process, although the offset shaft theoretically achieves axial positioning and axial retention, a tendency potential energy of deflection and jitter exists to a certain extent, and an encoder shell needs to have a very fine flexible tracking space besides not to follow rotation, namely the ability of absorbing the tendency potential energy. The encoder should therefore avoid direct hard attachment to the elevator drive frame, and in the preferred embodiment shown the housing of the encoder is attached to the elevator drive frame by S-shaped spring strips 83.

The driving nut 2 is integrally connected with the elevator driving frame based on the driving bottom plate 81, and in order to improve the energy efficiency of power transmission of the transmission belt, more than one set of tension wheel assemblies (hereinafter, illustrated and described as simply assemblies) matched and abutted with the transmission belt can be self-defined and connected to the bottom side of the driving bottom plate 81, so that the transmission belt is pressed and gathered towards the three shafts in a coplanar manner on one side of the driving nut facing the offset shaft, one side facing the output shaft of the driving motor or the side facing the two shafts. On the one hand, the tension of the drive belt is increased and on the other hand, the uniform application of force of the drive belt against the two sides of the drive nut is ensured. For this purpose, in the illustrated embodiment, four sets of tension wheel assemblies are used, and two sets of tension wheel assemblies are respectively arranged outside the transmission belts on two sides of the driving nut in a pair, namely, the assembly 44a and the assembly 44b are arranged on one side facing the offset shaft in a pair, the assembly 44c and the assembly 44d are arranged on one side facing the output shaft of the driving motor in a pair, and the transmission belts on two sides are in a gourd shape with the driving nut as the bottom.

As a further optimization design, a self-aligning ball bearing 443 is arranged between the tensioning shaft 441 and the tensioning outer wheel 442 in each tensioning wheel assembly 44 as shown in fig. 5. The self-aligning ball bearing ensures that the axial direction of the tensioning outer wheel is always parallel to the axial direction of the screw and the driving nut, so that the transmission performance of the transmission belt facing the main driving nut is optimized.

The driving belt is a v-ribbed belt (not shown in detail) having a plurality of lengthwise extending grooves on an inner side surface thereof, and the circumferential outer surfaces of the first pulley, the second pulley, and the driving nut are configured as v-ribbed pulleys that are in mating engagement with the driving belt. The transmission assembly of the V-ribbed belt and the V-ribbed belt wheel is preferably selected, on one hand, under the matching engagement of enough tensioning strength, the transmission power facing each belt wheel and the driving nut is in direct proportion to the number of tooth grooves, so the transmission energy efficiency is reliably ensured; on the other hand, the problem that the common synchronous belt (the teeth and the tooth grooves are arranged in the width direction) has staggered teeth at the belt pulley and the driving nut due to tensioning and stretching, meshing transmission is influenced, and the service life of a transmission part is shortened can be avoided.

On the other hand, the stopper 5 for releasing and applying the radial braking force is provided on the top side of the drive nut 2, and the biasing shaft assembly 43, the output shaft of the drive motor 1, the first pulley 42 and the transmission belt 41 are all stopped in the braking state of the drive nut. Therefore, the integral linkage locking of the elevator in a system failure or power loss state is realized while the power transmission is perfected.

The specific refinement structure for realizing braking comprises; the brake 5 is provided with a brake body, an electromagnetic coil 52, a spring 53 and a brake disc 51 with friction plates, which are internally connected, on the basis of a brake bottom plate 84, wherein the inner ring surface of the brake disc is provided with an internal spline, and the brake disc is in transmission connection and synchronous rotation through an external spline sleeve 61, a crosshead 62 and a drive nut 2 which are in fit connection with the internal spline. Referring to the drawings, the brake disc 51 is a hollow sleeve integrally formed with a disc surface, the inner wall of the sleeve is provided with an internal spline, and the bottom surface of the disc surface is integrally formed with a high-resistance friction surface (refer to a vehicle brake disc). The electromagnetic coil 52 and the spring 53 are respectively embedded and positioned in the brake body, are externally connected with a circuit and are the only electric control part, and are used for generating a strong magnetic field under the condition of power on and automatically dissipating the magnetic field under the condition of power off; the top end of the spring is positioned and hung, the bottom end of the spring is connected with the disc surface of the brake disc, and the spring has pushing tension for pushing the brake disc far away from the brake body in an assembled state. The external spline sleeve 61 is also a hollow sleeve, and the structural characteristics mainly include the following two parts: on one hand, the outer wall of the upper part is provided with an external spline which can be penetrated in the brake disc and is respectively matched with the internal spline; on the other hand, the lower part is connected and matched with the top convex rib of the crosshead shoe. The crosshead shoe 62 is similar to the above-described outer spline housing, and is connected to the outer spline housing and the drive nut as a transmission member for holding the upper and lower ends. After the elevator is integrally assembled, the brake is integrally sleeved on the screw rod, the electromagnetic coil overcomes the spring force in an electrified state, and the brake disc is attracted to float on the brake bottom plate and freely rotates with the drive nut; and when the electromagnetic coil is in a power-off state, the spring is tensioned, and the brake disc is in contact friction stop with the brake bottom plate. Under the practical application condition, the brake disc is only provided with a displacement amplitude within 0.5mm under visual identification under the traction action of the electromagnetic coil and the spring, but the realized braking effect meets the ideal period.

Certainly, the elevator platform often takes place the load to incline to and make the platform bottom plate take place horizontal tilt in the practicality, for keeping that drive nut and screw rod can keep good cooperation state that meets, above-mentioned crosshead shoe still leaves the space that can radial displacement, compensation axial slope with the sheathed tube junction of external spline, eliminates the probability of transmitting off-axis external force to drive nut through the stopper.

To sum up, the scheme introduction and the embodiment detailed description of the power transmission structure of the present invention can be seen, which has the prominent substantive features and the remarkable progress: this design has improved the drive belt towards the position of pressing of drive nut through addding the biasing axle subassembly under the prerequisite of guarantee power transmission, has eliminated completely and has caused the crooked external force of drive nut axial, is favorable to improving the cooperation precision of drive nut and screw rod, reduces wearing and tearing and prolongs drive nut life and dimension guarantee period to improve elevator running noise and body and feel.

In addition to the above embodiments, the present invention may have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of the present invention.

Claims

1. The utility model provides a power transmission structure of domestic platform elevator, links with driving motor and drive nut homogeneous phase, wherein the driving motor is based on elevator drive frame location dress, the drive nut cup joints in the controlled rotation of screw rod, its characterized in that: the power transmission structure comprises a transmission belt, a first belt wheel and a bias shaft assembly, wherein the first belt wheel is connected to an output shaft of a driving motor in a keyed mode and rotates coaxially, a bearing seat, a bias shaft, an encoder and a second belt wheel are integrally installed on the bias shaft assembly based on a bias bottom plate, the bias shaft and the output shaft of the driving motor are distributed on two sides of a driving nut and are axially parallel, the transmission belt is sleeved on the first belt wheel and the second belt wheel in a closed-loop rotation mode, and the transmission belt is pressed against two sides of the driving nut in axial central symmetry mode to transmit power.

2. The power transmission structure of a home platform elevator according to claim 1, wherein: the offset bottom plate and the bearing seat integrally connected with the offset bottom plate in the offset shaft assembly are connected and fixed with the elevator driving frame, the offset shaft penetrates through a pair of ball bearings which are distributed in the bearing seat in a height direction to be axially positioned, the second belt wheel is connected to the top of the offset shaft in a key mode to coaxially follow rotation, and the encoder is connected to the bottom of the offset shaft in a sleeved mode to track the rotating speed.

3. The power transmission structure of a home platform elevator according to claim 2, wherein: the casing of the encoder is connected to the elevator driving frame through an S-shaped spring plate to be radially stopped and is provided with a flexible tracking space which is in accordance with the axial deflection jitter of the offset shaft.

4. The power transmission structure of a home platform elevator according to claim 1, wherein: the driving nut is integrally connected with the elevator driving frame based on the driving bottom plate, more than one set of tensioning wheel assembly matched and abutted with the transmission belt is connected to the driving bottom plate, and the transmission belt is pressed and gathered towards the three shafts in a coplanar manner on one side of the driving nut facing the offset shaft, one side facing the output shaft of the driving motor or the side facing the two shafts.

5. The power transmission structure of a home platform elevator according to claim 4, wherein: two sets of tensioning wheel assemblies are arranged on the outer side of the transmission belt in any side direction of the driving nut in a pair, and a self-aligning ball bearing is arranged between the tensioning shaft and the tensioning outer wheel in each tensioning wheel assembly.

6. The power transmission structure of a home platform elevator according to claim 1, wherein: the driving belt is a multi-wedge belt with a plurality of length-direction extending grooves on the inner side surface, and the circumferential outer surfaces of the first belt wheel, the second belt wheel and the driving nut are designed into multi-wedge belt wheels which are engaged with the driving belt in a matching mode.

7. The power transmission structure of a home platform elevator according to claim 1, wherein: and a brake for releasing and applying radial braking force is arranged on the top side of the driving nut, and the offset shaft assembly, the output shaft of the driving motor, the first belt wheel and the transmission belt are all stopped in the braking state of the driving nut.

8. The power transmission structure of a home platform elevator according to claim 7, wherein: the brake is provided with a brake body, an electromagnetic coil, a spring and a brake disc with friction plates, wherein the electromagnetic coil, the spring and the brake disc are connected in an internally-connected mode on the basis of a brake bottom plate, the inner ring surface of the brake disc is provided with an internal spline, the brake disc is in transmission connection and synchronous rotation through an external spline sleeve, a cross slide block and a driving nut, the external spline sleeve, the cross slide block and the driving nut are matched with the internal spline, the electromagnetic coil overcomes the spring force in an electrified state, and the brake disc; and when the electromagnetic coil is in a power-off state, the spring is tensioned, and the brake disc is in contact friction stop with the brake bottom plate.

9. The power transmission structure of a home platform elevator according to claim 8, wherein: and a gap capable of radially displacing and compensating axial inclination is reserved at the joint of the crosshead shoe and the external spline sleeve.