Screw-driven elevator

Abstract

The invention discloses a screw-driven elevator which is arranged in a hoistway and comprises a screw, a car frame and a driving mechanism for driving the car frame to move up and down along the screw, a fixed beam is arranged at the top of the hoistway, the top of the screw is fixed on the fixed beam in a suspended mode, and the screw is fixed on the fixed beam. A disc brake is arranged between the driving mechanism and the car frame, and the screw penetrates through the disc brake. In other words, the disc brake is sleeved outside the screw, the brake surface is horizontal and perpendicular to the screw, and the brake effect is better. According to the screw driving type elevator, the top of the screw is fixedly suspended on the fixed beam, the screw does not rotate, the whole elevator is fixed, and the structure is more stable; meanwhile, the disc brake allowing the screw to penetrate through is adopted, the braking face is perpendicular to the screw, and the braking effect is better; the operation structure is optimized, the riding comfort is improved, and meanwhile the installation, maintenance and operation reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and more specifically to a screw-driven elevator structure. Background Technology

[0002] With the advancement of urbanization and construction, and the continuous improvement of people's living standards, the market demand for home elevators is also constantly increasing. Currently, home platform elevators on the market are mainly divided into screw-driven or steel belt traction drive structures.

[0003] In screw-driven home platform elevators, the drive motor and nut are directly fixed to the car platform or simply connected by shock-absorbing springs. When the elevator is running, the vibration generated by the movement of the motor, screw, and nut is directly transmitted to the passengers through the car frame and car floor, accompanied by considerable noise, resulting in very low overall comfort. At the same time, the existing brake structure has poor stability and high assembly requirements.

[0004] For example, patent CN114906703A discloses a screw-driven elevator, which has a first damping mechanism and a second damping mechanism. The second damping mechanism is connected to the car frame and the fixed plate through a connector, and its structural strength and vibration damping effect need improvement. The screw in this patent can rotate, and its top is rotatably connected to the first damping mechanism, making the screw structure unstable. Furthermore, the braking mechanism in this patent is a holding brake structure, which applies the brake from the side of the drive structure, such as the synchronous pulley, resulting in an excessively wide width. The spacing between the second damping mechanism and the screw is inconsistent, leading to poor operational stability of the car frame and car, and higher wear. Summary of the Invention

[0005] In view of this, in order to solve the problems of the prior art, the present invention provides an improved screw-driven elevator with better shock absorption, higher overall structural strength, better braking effect, and better passenger comfort.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A screw-driven elevator, installed in a shaft, includes a screw, a car frame, and a drive mechanism for driving the car frame to move up and down along the screw. A fixed beam is provided at the top of the shaft, and the top of the screw is suspended and fixed to the fixed beam. A disc brake is provided between the drive mechanism and the car frame, with the screw passing through the disc brake. That is, the disc brake is sleeved on the outside of the screw, with the braking surface horizontal and perpendicular to the screw, resulting in better braking performance.

[0007] According to some preferred embodiments of the present invention, the disc brake sequentially comprises an electromagnet, a movable disc, and a brake disc. The brake disc is fixedly connected to the drive mechanism and sleeved on the outer periphery of the screw. The electromagnet is used to control the movable disc to disengage from the brake disc when energized. The brake disc is located between the drive mechanism and the movable disc, and the movable disc is an armature. When energized, the electromagnet has magnetic force, attracting the movable disc and causing it to disengage from the brake disc, thus eliminating the braking torque and allowing the drive mechanism to rotate normally.

[0008] According to some preferred embodiments of the present invention, a braking element is provided between the movable disc and the electromagnet, the braking element being used to provide a tendency for the movable disc to move closer to and engage with the brake disc. The braking element is a spring, used to push the movable disc closer to and press against the brake disc when the electromagnet is de-energized, generating a frictional torque to achieve braking.

[0009] According to some preferred embodiments of the present invention, the electromagnet, movable disc, brake disc, and screw are coaxially arranged and sleeved on the outside of the screw. The electromagnet, movable disc, and brake disc are all annularly arranged, resulting in a large braking surface and good braking effect.

[0010] According to some preferred embodiments of the present invention, the electromagnet is further provided with a guide post for guiding the movement of the movable disk, thereby ensuring the stability of the movement of the movable disk.

[0011] According to some preferred embodiments of the present invention, a friction pad is provided on the side of the brake disc near the movable disc, the friction pad being used to contact the movable disc during braking.

[0012] According to some preferred embodiments of the present invention, the drive mechanism includes a drive nut sleeved on the outside of the screw and a drive motor for driving the drive nut to rotate; a synchronous pulley is fixed to the upper part of the drive nut, and a synchronous belt is provided between the output shaft of the drive motor and the synchronous pulley. The rotation of the drive motor drives the synchronous belt and the synchronous pulley to rotate, thereby driving the brake disc above the synchronous pulley and the drive nut below the synchronous pulley to rotate.

[0013] According to some preferred embodiments of the present invention, the synchronizing pulley is fixedly connected to the brake disc, and the drive nut, synchronizing pulley, and brake disc are coaxially arranged and rotate synchronously. The disc brake is used to brake the brake disc, achieving synchronous braking of the synchronizing pulley and drive nut.

[0014] According to some preferred embodiments of the present invention, a shock-absorbing mechanism is provided between the drive mechanism and the car frame, and the distance between multiple sets of shock-absorbing mechanisms and the screw is equal, so that the support of the car frame is more stable and the overall structure is more stable; a first mounting plate is provided at the bottom of the car frame, and a second mounting plate is provided on the drive mechanism, and the first mounting plate and the second mounting plate are connected by a connector, and the shock-absorbing mechanism includes an elastic element and / or a gasket sleeved on the connector.

[0015] In some embodiments, a connector passes through the first mounting plate and the second mounting plate, and a nut is provided at the end of the connector, such that the first mounting plate and the second mounting plate are located between two nuts. The connector and the nut only limit the movement of the first mounting plate and the second mounting plate, and do not fix the first mounting plate and the second mounting plate. A shock-absorbing mechanism is provided between the first mounting plate and the second mounting plate, so that the first mounting plate is supported on the shock-absorbing mechanism, producing a floating effect and realizing shock absorption. The shock-absorbing mechanism includes an elastic element and a washer. The elastic element is a spring, and the washer is a rubber sheet. The elastic element is close to the first mounting plate, and the washer is close to the second mounting plate. One end of the elastic element acts on the washer, and the other end acts on the first mounting plate.

[0016] According to some preferred embodiments of the present invention, a fixing seat is provided on the fixing beam, the top of the screw is inserted into the fixing seat and fixed by a fixing pin, and the screw does not rotate.

[0017] Preferably, a damping plate and a fixing plate are provided on the fixed beam, the fixing seat is fixed on the fixing plate, and the fixing pin is horizontally set and passes through the fixing seat and the screw, so as to suspend and fix the screw. The screw does not rotate and is suspended from the top, resulting in a stable structure and better comfort.

[0018] Compared with the prior art, the advantages of the present invention are as follows: The screw-driven elevator of the present invention, by fixing the top of the screw to the fixed beam, prevents the screw from rotating and fixes the whole structure, making the structure more stable; at the same time, it adopts a disc brake through which the screw passes, with the braking surface perpendicular to the screw, resulting in uniform force distribution and better braking effect; the operating structure is optimized, improving passenger comfort, while also improving installation, maintenance and operational reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view structural diagram of a screw-driven elevator (without guide rails, shaft, or other conventional components) according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the main structure of the shock absorption mechanism after installation in a screw-driven elevator according to an embodiment of the present invention. Figure 3 This is a schematic cross-sectional view of the disc brake in a screw-driven elevator according to an embodiment of the present invention. Figure 4 This is a three-dimensional structural diagram of the driving nut in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the screw in an embodiment of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the drive nut in an embodiment of the present invention; Figure 7 This is a schematic diagram of the threaded engagement between the screw and the protrusion in an embodiment of the present invention; The components include: screw-1, external thread-11, car frame-2, fixed beam-3, disc brake-4, electromagnet-41, movable disc-42, brake disc-43, brake element-44, guide post-45, friction plate-46, junction box-47, drive mechanism-5, motor-51, drive nut-52, body-521, protrusion-522, mounting part-523, mounting hole-524, internal thread-525, measuring thread-526, first end face-527, channel-528, synchronous pulley-53, synchronous belt-54, safety nut-55, safety limit switch-56, elastic element-61, gasket-62, first mounting plate-71, second mounting plate-72, fixed seat-81, fixed pin-82, shock absorber-83, fixed plate-84, and lubrication mechanism-9. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] like Figures 1-7 As shown, the screw-driven elevator in this embodiment is installed in the hoistway and includes a screw 1, a car frame 2, and a drive mechanism 5 that drives the car frame 2 to move up and down along the screw 1 in the hoistway. A fixed beam 3 is provided at the top of the hoistway, and the top of the screw 1 is suspended and fixed on the fixed beam 3. A disc brake 4 is provided between the drive mechanism 5 and the car frame 2, and the screw 1 passes through the disc brake 4. That is, the disc brake 4 is sleeved on the outside of the screw 1, with the braking surface horizontal and perpendicular to the screw 1, resulting in better braking effect.

[0023] The drive mechanism 5 includes a drive nut 52 sleeved on the outside of the screw 1, a synchronous pulley 53 fixedly connected to the drive nut 52, and a drive motor 51 for driving the synchronous pulley 53 to rotate. A synchronous belt 54 is provided between the output shaft of the drive motor 51 and the synchronous pulley 53. The rotation of the drive motor 51 drives the synchronous belt 54 and the synchronous pulley 53 to rotate, which in turn drives the brake disc 43 above the synchronous pulley 53 and the drive nut 52 below the synchronous pulley 53 to rotate. The upper part of the drive nut 52 is fixedly connected to the synchronous pulley 53, and a safety nut 55 is provided at the lower part. The three are coaxially arranged and rotate synchronously.

[0024] The disc brake 4 comprises an electromagnet 41, a movable disc 42, and a brake disc 43. The brake disc 43 is fixedly connected to the synchronous pulley 53 of the drive mechanism 5 and sleeved on the outer circumference of the screw 1. The electromagnet 41 controls the movable disc 42 to disengage from the brake disc 43 when energized. The brake disc 43 is located between the drive mechanism 5 and the movable disc 42, which is an armature. When energized, the electromagnet 41 has magnetic force, attracting the movable disc 42 and causing it to disengage from the brake disc 43. The braking torque disappears, and the drive mechanism 5 rotates normally.

[0025] A braking element 44 is provided between the movable disc 42 and the electromagnet 41. The braking element 44 provides a tendency for the movable disc 42 to move closer to and fit against the brake disc 43, achieving friction braking. The braking element 44 is a spring, which pushes the movable disc 42 closer to and presses against the brake disc 43 when the electromagnet 41 is de-energized, generating frictional torque to achieve braking. The electromagnet 41, movable disc 42, brake disc 43, and screw 1 are coaxially arranged and sleeved on the outside of the screw 1. The electromagnet 41, movable disc 42, and brake disc 43 are all annularly arranged, with a large braking surface, uniform force distribution, and good braking effect. The synchronous pulley 53 is fixedly connected to the brake disc 43, and the drive nut 52, synchronous pulley 53, and brake disc 43 are coaxially arranged and rotate synchronously. The disc brake 4 is used to brake the brake disc 43, achieving synchronous braking of the synchronous pulley 53 and the drive nut 52.

[0026] The electromagnet 41 is also equipped with a guide post 45 to guide the movement of the movable disc 42, ensuring the stability of the movement of the movable disc 42. A friction plate 46 is provided on the side of the brake disc 43 near the movable disc 42, and the friction plate 46 is used to contact the movable disc 42 during braking. A junction box 47 is provided on the side of the electromagnet 41.

[0027] In this embodiment, when the electromagnetic coil in the electromagnet 41 of the disc brake 4 is energized, the electromagnet 41 attracts the armature and compresses the brake spring (brake element 44) due to the electromagnetic attraction, the movable disc 42 separates from the brake disc 43, and the braking torque disappears; when the electromagnetic coil in the electromagnet 41 is de-energized, the brake loses the electromagnetic attraction, and the brake spring (brake element 44) pushes the armature to make the movable disc 42 press against the brake disc 43, generating frictional torque and realizing braking.

[0028] A shock-absorbing mechanism is provided between the drive mechanism 5 and the car frame 2. The distance between the multiple shock-absorbing mechanisms and the screw 1 is equal, which makes the support of the car frame 2 more stable and the overall structure more stable.

[0029] The bottom of the car frame 2 is provided with a first mounting plate 71, and the drive mechanism 5 is provided with a second mounting plate 72. The first mounting plate 71 and the second mounting plate 72 are connected by a connector. The shock absorption mechanism includes an elastic element 61 and a gasket 62 sleeved on the connector.

[0030] The connector is a threaded rod that passes through the first mounting plate 71 and the second mounting plate 72. A nut is provided at the end of the connector, positioning the first mounting plate 71 and the second mounting plate 72 between two nuts. The connector and nuts only restrict the movement of the first mounting plate 71 and the second mounting plate 72, without fixing them. A shock-absorbing mechanism is provided between the first mounting plate 71 and the second mounting plate 72, allowing the car frame to be supported on the shock-absorbing mechanism via the first mounting plate 71, creating a floating effect and achieving shock absorption. The shock-absorbing mechanism includes an elastic element 61 and a washer 62. The elastic element 61 is a spring, and the washer 62 is a rubber sheet. The elastic element 61 is closer to the first mounting plate 71, and the washer 62 is closer to the second mounting plate 72. One end of the elastic element 61 acts on the washer 62, and the other end acts on the first mounting plate 71.

[0031] The top suspension structure of screw 1 is as follows: A fixing seat 81 is provided on the fixing beam 3. The top of screw 1 is inserted into the fixing seat 81 and fixed by a fixing pin 82, so screw 1 does not rotate. A damping plate 83 and a fixing plate 84 are provided on the fixing beam 3. The fixing seat 81 is fixed on the fixing plate 84. The fixing pin 82 is horizontally set and passes through the fixing seat 81 and screw 1, thereby suspending and fixing screw 1. Screw 1 does not rotate and is suspended from the top, resulting in a stable structure and better comfort.

[0032] Furthermore, such as Figures 4-7 As shown, to facilitate the detection of wear on the drive nut 52, the drive nut 52 in this embodiment includes a body 521 and protrusions 522 located on the body 521. The body is cylindrical. The body 521 has a first end face 527 and a second end face opposite to the first end face 527. One or more protrusions 522 are provided on the first end face 527; the protrusions 522 are evenly spaced on the first end face 527. The second end face has a mounting portion 523, the cross-sectional dimension of which is larger than that of the body 521. The mounting portion 523 is used to mount the drive nut 52 to the synchronous pulley 53, so that the motor 51 drives the synchronous pulley 53 to rotate the drive nut 52.

[0033] In this embodiment, the first end face 527 has two protrusions 522, which are radially distributed along the body 521. That is, the two protrusions 522 are symmetrically distributed on both sides of the screw 1. In some other embodiments, it is preferable to have three protrusions 522 on the first end face 527. If four or more protrusions 522 are provided, the spacing between adjacent protrusions 522 becomes smaller, which will cause inconvenience for measurement. When the first end face 527 has three protrusions 522, the three protrusions 522 form an equilateral triangle. The center of the equilateral triangle is located on the axis of the screw 1 or the drive nut 52. The arrangement of multiple protrusions 522 makes the force more uniform and allows for multiple measurements, improving accuracy. Furthermore, in this embodiment, the outer diameter of the body 521 is 7 to 8 times the thickness of the protrusions to avoid the width of the protrusions being too large and causing inconvenience for measurement.

[0034] The body 521 has an internal channel 528 through which the screw 1 passes. The inner wall of the channel 528 has an internal thread 525, and the screw 1 has an external thread 11. The internal thread 525 and the external thread 11 cooperate to allow the drive nut 52 to move along the screw 1. The protrusion 522, near the channel 528, has a measuring thread 526 integrally formed with the internal thread 525. The parameters of the measuring thread 526 are the same as those of the internal thread 525 inside the body 521. The measuring thread 526 is used to measure the wear of the drive nut 52 by cooperating with the external thread 11 of the screw 1. The protrusion 522 and its measuring thread 526 are exposed and cooperate with the external thread 11 of the screw 1. A feeler gauge can be used to easily measure the wear of the drive nut 52. Figure 7 As shown. Figure 6 The lower left side of the diagram shows a cross-section without protrusion 522, while the lower right side shows a cross-section with protrusion 522.

[0035] In this embodiment, a mounting hole 524 is provided on the first end face 527 of the main body 521 for connecting the safety nut 55. That is, both the drive nut 52 and the safety nut 55 are located below the synchronous pulley 53, with a small distance between them, resulting in a more similar stress environment and wear rate, which is more beneficial to the nut's lifespan. Furthermore, in this embodiment, the drive nut 52 is positioned at the lower part of the synchronous pulley 53, allowing for the installation of a braking mechanism (disc brake 4) and a shock absorption mechanism on the upper part of the synchronous pulley 53, resulting in a more compact overall structure and higher space utilization.

[0036] Preferably, the mounting plate has a downwardly extending mounting rod on its side. The mounting rod is equipped with a safety limit switch 56 corresponding to the safety nut 55 and a lubrication mechanism 9. The safety limit switch 56 works with the safety nut 55 to achieve safety monitoring and braking. The lubrication mechanism 9 is located below the drive nut 52 and the safety nut 55, so that the distance between the lubrication mechanism 9 and the drive nut 52 and the safety nut 55 is closer, and the lubrication effect is better.

[0037] The screw-driven elevator of this invention features a screw 1 that is fixedly suspended from the top of a fixed beam 3, preventing rotation and ensuring overall stability. This design facilitates installation and provides good flexibility in the screw-drive mechanism. A double-dampening structure of springs and rubber is used between the car frame and the drive mechanism, effectively improving operational comfort. A disc brake 4, through which the screw 1 passes, is used, with the braking surface perpendicular to the screw 1. This design results in a compact structure, uniform force distribution, better braking effect, and improved braking stability. A protrusion 522 is provided on the body 521 of the drive nut 52, and a measuring thread 526, identical to the internal thread 525 of the body 521, is provided on the protrusion 522, exposing the thread. The wear condition of the drive nut 52 can then be obtained through the measuring thread 526 on the protrusion 522, providing convenience and speed. This optimizes the detection of wear on the drive nut 52 during maintenance, enhancing elevator safety.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A screw-driven elevator, wherein the screw-driven elevator is disposed in a shaft, comprising a screw, a car frame, and a drive mechanism for driving the car frame to move up and down along the screw, characterized in that, A fixed beam is provided at the top of the shaft, and the top of the screw is suspended and fixed on the fixed beam. A disc brake is provided between the drive mechanism and the car frame, and the screw passes through the disc brake.

2. The screw-driven elevator according to claim 1, characterized in that, The disc brake includes an electromagnet, a movable disc, and a brake disc in sequence. The brake disc is fixedly connected to the drive mechanism and sleeved on the outer periphery of the screw. The electromagnet is used to control the movable disc to disengage from the brake disc when energized.

3. The screw-driven elevator according to claim 2, characterized in that, A braking element is provided between the movable disc and the electromagnet, and the braking element is used to provide a tendency for the movable disc to move closer to and fit against the braking disc.

4. The screw-driven elevator according to claim 2, characterized in that, The electromagnet, movable disc, brake disc, and screw are coaxially arranged and sleeved on the outside of the screw.

5. The screw-driven elevator according to claim 2, characterized in that, The electromagnet is also provided with a guide post for guiding the movement of the movable disc.

6. The screw-driven elevator according to claim 2, characterized in that, A friction pad is provided on the side of the brake disc near the movable disc, and the friction pad is used to contact the movable disc during braking.

7. The screw-driven elevator according to claim 2, characterized in that, The drive mechanism includes a drive nut sleeved on the outside of the screw and a drive motor for driving the drive nut to rotate; a synchronous pulley is fixed on the upper part of the drive nut, and a synchronous belt is provided between the output shaft of the drive motor and the synchronous pulley.

8. The screw-driven elevator according to claim 7, characterized in that, The synchronous pulley is fixedly connected to the brake disc, and the drive nut, synchronous pulley and brake disc are coaxially arranged and rotate synchronously.

9. The screw-driven elevator according to claim 1, characterized in that, A shock-absorbing mechanism is provided between the drive mechanism and the car frame, and the distance between the multiple shock-absorbing mechanisms and the screw is equal; a first mounting plate is provided at the bottom of the car frame, and a second mounting plate is provided on the drive mechanism. The first mounting plate and the second mounting plate are connected by a connector. The shock-absorbing mechanism includes an elastic element and / or a gasket sleeved on the connector.

10. The screw-driven elevator according to claim 1, characterized in that, A fixing seat is provided on the fixing beam, and the top of the screw is inserted into the fixing seat and fixed by a fixing pin, so that the screw does not rotate.

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