Drive structure for screw ladder and elevator

Abstract

The utility model discloses a kind of driving structure suitable for screw ladder, including driver, screw rod and drive nut, the drive nut is sleeved in the outer periphery of the screw rod, the driver is used to drive the drive nut rotation, the drive nut is set in the lower part of the driver, the screw rod is through the driver and drive nut.This utility model's driving structure suitable for screw ladder, screw rod is directly through driver, and drive nut is connected in the lower part of driver, so that the upper portion of driver can be provided with brake mechanism and damping mechanism, overall structure is more compact, the load of drive nut is more reasonable;And drive nut is set below, it is convenient to maintain and easy to measure thread wear amount.

Description

Technical Field

[0001] This utility model relates to the field of elevator technology, specifically to a drive structure suitable for screw elevators and an elevator including the drive structure, especially a home elevator. 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. Among them, screw-driven home platform elevators are driven by a motor to rotate a drive nut, which is fitted onto a screw. The rotation of the drive nut, in turn, causes the drive nut to rotate along the screw.

[0003] Existing literature describes the driving method of screw elevators mainly as follows: a motor drives a nut to rotate on the screw via a drive belt or drive sprocket, causing the platform to move up and down. For example, patent CN221853868U discloses a screw elevator that can extend the screw's lifespan. However, its drive nut is fitted to the upper part of the motor, and the motor is located on the side of the screw, occupying a large space.

[0004] It is evident that existing drive structures all require a nut at the top, which presents the following problems: with the nut positioned at the top, debris can easily fall in, damaging both the nut and the screw; the space above the drive structure is occupied, as is the side space of the screw, resulting in an overall less compact drive structure. Utility Model Content

[0005] In view of this, in order to solve the problems of the prior art, the present invention provides a drive structure suitable for screw ladders, wherein the screw directly passes through the driver and the drive nut is located below the driver.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A drive structure suitable for a screw ladder includes a driver, a screw, and a drive nut. The drive nut is sleeved on the outer circumference of the screw. The driver drives the drive nut to rotate. The drive nut is located below the driver. The screw passes through the driver and the drive nut. The driver, drive nut, and screw are coaxially arranged.

[0007] According to some preferred embodiments of the present invention, the driver includes a fixed part and a rotating part, the rotating part being located inside, the fixed part being located outside the rotating part, and the bottom of the rotating part being fixedly connected to the driving nut.

[0008] According to some preferred embodiments of the present invention, a safety nut is provided on the side of the drive nut away from the driver.

[0009] According to some preferred embodiments of the present invention, a bolt is provided between the drive nut and the safety nut, wherein the bolt is fixedly connected to the drive nut and slidably connected to the safety nut, or the bolt is slidably connected to the drive nut and fixedly connected to the safety nut.

[0010] According to some preferred embodiments of the present invention, it further includes an elastic element for providing a force that tends the safety nut toward the drive nut.

[0011] According to some preferred embodiments of the present invention, a braking mechanism is provided on the upper part of the driver, the braking mechanism being used to fix the position of the driver on the screw.

[0012] According to some preferred embodiments of the present invention, the drive structure includes a mounting plate for fixing to the car, and a shock-absorbing mechanism is provided between the mounting plate and the fixing part of the drive unit.

[0013] According to some preferred embodiments of the present invention, the mounting plate is located above the driver. According to some preferred embodiments of this utility model, the drive nut includes a body and a protrusion located on the body. The body has an internal channel through which the screw passes. The inner wall of the channel has an internal thread, and the screw has an external thread. The internal and external threads cooperate to allow the drive nut to move along the screw. The protrusion has a measuring thread integrally formed with the internal thread on its side near the channel. The measuring thread is used to measure the wear of the drive nut by cooperating with the external thread of the screw. The parameters of the measuring thread are the same as those of the internal thread inside the body. The protrusion and its measuring thread are exposed and cooperate with the external thread of the screw, allowing for convenient measurement of the wear of the drive nut using a feeler gauge.

[0014] According to some preferred embodiments of this utility model, the body has a first end face, and one or more of the protrusions are provided on the first end face. The arrangement of multiple protrusions makes the force distribution more uniform and enables multiple measurements, thereby improving accuracy.

[0015] According to some preferred embodiments of the present invention, a plurality of protrusions are evenly spaced and distributed on the first end face. A mounting hole is provided on the first end face of the body for connecting a safety nut.

[0016] In some embodiments, the first end face has two protrusions, which are radially distributed along the body. That is, the two protrusions are symmetrically distributed on both sides of the screw.

[0017] In other embodiments, the first end face has three protrusions arranged in an equilateral triangle. The center of the equilateral triangle is located on the axis of the screw or drive nut.

[0018] Preferably, there are two or three protrusions on the first end face. If four or more protrusions are set, the spacing between adjacent protrusions becomes smaller, which will cause inconvenience to the measurement.

[0019] More preferably, the outer diameter of the body is 5 to 10 times the thickness of the bump, more preferably 7 to 8 times, so as to avoid the bump being too wide and causing inconvenience to measurement.

[0020] According to some preferred embodiments of the present invention, the body has a second end face opposite to the first end face, and the second end face has a mounting portion for fixing to the driver, the cross-sectional dimension of the mounting portion being larger than the cross-sectional dimension of the body. That is, the mounting portion is used to connect and fix the drive nut to the rotating part of the driver.

[0021] This invention also provides an elevator, particularly a home elevator, that includes the drive structure described above.

[0022] Compared with the prior art, the advantages of this utility model are as follows: The drive structure of this utility model, which is applicable to screw ladders, has a screw that directly passes through the driver and the drive nut connected to the bottom of the driver, so that the upper part of the driver can be equipped with a braking mechanism and a shock absorption mechanism. The overall structure is more compact and the load-bearing capacity of the drive nut is more reasonable. Moreover, the drive nut is located at the bottom, which is convenient for maintenance and easy to measure the amount of thread wear. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the drive nut in some embodiments of the present invention; Figure 2 This is a three-dimensional structural diagram of the screw in some embodiments of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the drive nut in some embodiments of this utility model; Figure 4 This is a schematic diagram of the threaded engagement between the screw and the protrusion in some embodiments of this utility model; Figure 5 This is a schematic cross-sectional view of the driving structure in some embodiments of the present invention. Figure 1 ; Figure 6 This is a schematic cross-sectional view of the driving structure in some embodiments of the present invention. Figure 2 ; Figure 7 This is a schematic cross-sectional view of the driving structure in some embodiments 3 of this utility model. Figure 3 ; The components are: screw-1, drive nut-2, body-3, protrusion-4, mounting part-5, mounting hole-6, internal thread-7, external thread-8, measuring thread-9, first end face-10, channel-11, rotating part-121, fixing part-122; safety nut-13; brake mechanism-14; mounting plate-15; mating seat-16; compression spring-17; compression spring rod-18; bolt-19; elastic element-20; bolt head-21; second end face-22; feeler gauge measuring gap-X. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0026] like Figure 1-7 As shown, some embodiments of the elevator of this utility model include conventional components such as a car and a corresponding drive structure. The drive structure includes a driver, a screw 1, and a drive nut 2. The driver and the car are fixedly connected. The drive nut 2 is sleeved on the outer periphery of the screw 1. The driver is used to drive the drive nut 2 to rotate. The drive nut 2 is located below the driver. The screw 1 passes through the driver and the drive nut 2. The driver, drive nut 2, and screw 1 are coaxially arranged.

[0027] The drive unit includes a fixed part 122 and a rotating part 121. The rotating part 121 is located inside, and the fixed part 122 is located outside the rotating part 121. The bottom of the rotating part 121 is fixedly connected to the drive nut 2, and the fixed part 122 is indirectly or directly fixedly connected to the car. The rotating part 121 drives the drive nut 2 to rotate on the screw 1, thereby realizing the up and down movement of the drive nut 2, the drive unit, and the car along the screw 1. In some embodiments, the drive unit is a permanent magnet motor, and the rotating part 121 is a motor shaft.

[0028] In some embodiments, the wear of the drive nut 2 can be directly detected using a feeler gauge through the exposed two sets of measuring threads, as required by design. Specifically, in some embodiments, the drive nut 2 includes a body 3 and protrusions 4 located on the body 3. The body 3 is cylindrical. The body 3 has a first end face 10 and a second end face 22 opposite to the first end face 10. In one embodiment, the first end face 10 is located on the lower side of the body 3, and the second end face is located on the upper side of the body 3. One or more protrusions 4 are provided on the first end face 10; the protrusions 4 are evenly spaced on the first end face 10. The second end face 22 has a mounting portion 5, the cross-sectional dimension of which is larger than that of the body 3. The mounting portion 5 is used to fix the drive nut 2 to the rotating part 121 of the driver, so that the driver drives the drive nut 2 to rotate.

[0029] In some embodiments, the first end face 10 has two protrusions 4, which are radially distributed along the body 3. That is, the two protrusions 4 are symmetrically distributed on both sides of the screw 1. In other embodiments, it is preferable to have three protrusions 4 on the first end face 10. If four or more protrusions 4 are provided, the spacing between adjacent protrusions 4 becomes smaller, which will cause inconvenience for measurement. When there are three protrusions 4 on the first end face 10, the three protrusions 4 form an equilateral triangle, and the center of the equilateral triangle is located on the axis of the screw 1 or the drive nut 2. The arrangement of multiple protrusions 4 makes the force more uniform and allows for multiple measurements, improving accuracy. In some embodiments, the outer diameter of the body 3 is 7 to 8 times the thickness of the protrusions to avoid the width of the protrusions 4 being too large and causing inconvenience for measurement.

[0030] The body 3 has an internal channel 11 through which the screw 1 passes. The inner wall of the channel 11 has an internal thread 7, and the screw 1 has an external thread 8. The internal thread 7 and the external thread 8 cooperate to allow the drive nut 2 to move along the screw 1. The protrusion 4 has a measuring thread 9 integrally formed with the internal thread 7 on the side near the channel 11. The parameters of the measuring thread 9 are the same as those of the internal thread 7 inside the body 3. The measuring thread 9 is used to measure the wear of the drive nut 2 by cooperating with the external thread 8 of the screw 1. The protrusion 4 and its measuring thread 9 are exposed and cooperate with the external thread 8 of the screw 1. A feeler gauge can be used to easily measure the wear of the drive nut 2. Figure 2 The figure shows the feeler gauge measuring gap X.

[0031] Preferably, such as Figure 6As shown, in some embodiments, the drive structure includes a safety nut 13 disposed on the side of the drive nut 2 away from the driver. A mounting hole 6 is provided on the first end face 10 of the body 3. The mounting hole 6 is used to install a bolt 19 to connect the safety nut 13. The bolt 19 is fixedly connected to the drive nut 2 and slidably connected to the safety nut 13. In other embodiments, the bolt 19 can also be slidably connected to the drive nut 2 and fixedly connected to the safety nut 13. An elastic element 20 is also provided, which provides a force that tends to bring the safety nut 13 closer to the drive nut 2. Specifically, in one embodiment, the lower end of the bolt 19 has a bolt head 21, the elastic element 20 is disposed between the bolt head 21 and the safety nut 13, and a protrusion 4 is located between the body 3 and the safety nut 13. Both the drive nut 2 and the safety nut 13 are located below the drive unit, with a small distance between them. When the drive nut 2 wears down and slips between it and the screw 1, or when the elevator suddenly drops, the safety nut 13 moves closer to the drive nut 2, so that the internal thread of the safety nut 13 engages with the external thread 8 of the screw 1, thus preventing the elevator from falling further. Compared to the structure where the drive nut 2 and safety nut 13 are located on the upper and lower sides of the driver, this utility model is more convenient for arranging the bolt 19 and elastic components. When the elevator is running normally, the drive nut 2 needs to bear the weight of the entire elevator. Compared to placing it above the driver, placing the drive nut 2 below the driver makes the load-bearing capacity of the drive nut 2 more reasonable. Specifically, the rotating part 121 in the driver transmits the output rotational force to the drive nut 2 below. In addition to bearing the downward weight of the elevator, the drive nut 2 also needs to bear part of the weight of the driver, so that the drive nut 2 is more tightly attached to the external thread 8 of the screw 1, preventing the drive nut 2 from slipping. Similarly, placing the safety nut 13 below the driver can also prevent the safety nut 13 from slipping.

[0032] Preferably, such as Figure 7As shown, the upper part of the drive unit is provided with a braking mechanism for fixing the drive unit's position on the screw 1, which can be a holding brake mechanism 14. The car is fixed on the mounting plate 15, which is located above the drive unit. A shock-absorbing mechanism is provided between the mounting plate 15 and the drive unit's fixing part 122. In some embodiments, the fixing part 122 includes a mating seat 16 extending in the left-right direction on its upper part. The shock absorption mechanism is specifically a compression spring 17. In some embodiments, there are two compression springs 17, which are respectively disposed on the left and right sides of the screw 1. In other embodiments, the number of compression springs 17 can also be set to one or more. The upper end of the compression spring 17 abuts against the mounting plate 15, and the lower end of the compression spring 17 abuts against the mating seat 16. That is, the compression spring 17 abuts between the mating seat 16 and the mounting plate 15. Specifically, a compression spring rod 18 can be fixedly connected to the mounting plate 15 and the mating seat 16 respectively. The compression spring 17 is sleeved on the compression spring rod 18. In some embodiments, the driving nut 2 is set at the lower part of the driver, so that the braking mechanism and shock absorption mechanism can be set at the upper part of the driver, making the overall structure more compact and the space utilization rate higher.

[0033] This utility model discloses a drive structure suitable for screw elevators. The screw 1 directly passes through the drive unit, and the drive nut 2 is connected to the lower part of the drive unit. This allows the space in the upper part of the drive unit to accommodate the braking and shock absorption mechanisms, resulting in a more compact overall structure. Furthermore, the lower placement of the drive nut 2 facilitates maintenance and replacement, reduces the risk of debris falling into it, and ensures more reasonable load-bearing capacity. By providing a protrusion 4 on the body 3 of the drive nut 2 and a measuring thread 9 identical to the internal thread 7 of the body 3 on the protrusion 4, the thread is exposed. The wear condition of the drive nut 2 can then be obtained through the measuring thread 9 on the protrusion 4, which is convenient and quick. This optimizes the detection of wear on the drive nut 2 during maintenance and improves elevator safety.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A drive structure suitable for screw ladders, characterized in that, It includes a driver, a screw, and a drive nut. The drive nut is sleeved on the outer periphery of the screw. The driver is used to drive the drive nut to rotate. The drive nut is located below the driver. The screw passes through the driver and the drive nut.

2. The driving structure according to claim 1, characterized in that, The driver includes a fixed part and a rotating part, the rotating part is located inside, the fixed part is located outside the rotating part, and the bottom of the rotating part is fixedly connected to the driving nut.

3. The driving structure according to claim 1, characterized in that, Includes a safety nut, which is disposed on the side of the drive nut away from the driver.

4. The driving structure according to claim 3, characterized in that, A bolt is provided between the drive nut and the safety nut, wherein the bolt is fixedly connected to the drive nut and slidably connected to the safety nut, or the bolt is slidably connected to the drive nut and fixedly connected to the safety nut.

5. The driving structure according to claim 4, characterized in that, It also includes an elastic element for providing a force that tends the safety nut toward the drive nut.

6. The driving structure according to claim 1, characterized in that, The upper part of the driver is provided with a braking mechanism, which is used to fix the position of the driver on the screw.

7. The driving structure according to claim 2, characterized in that, The drive structure includes a mounting plate for fixing to the car, and a shock-absorbing mechanism is provided between the mounting plate and the fixing part of the drive unit.

8. The driving structure according to claim 7, characterized in that, The mounting plate is located above the driver.

9. The driving structure according to claim 1, characterized in that, The drive nut includes a body and a protrusion on the body. The body has a channel through which the screw passes. The inner wall of the channel has an internal thread, and the screw has an external thread. The internal and external threads cooperate to allow the drive nut to move along the screw. The protrusion has a measuring thread integrally formed with the internal thread on the side near the channel. The measuring thread is used to cooperate with the external thread of the screw to measure the wear of the drive nut.

10. The driving structure according to claim 9, characterized in that, The body has a first end face, on which one or more of the protrusions are provided.

11. The driving structure according to claim 10, characterized in that, The protrusions are evenly spaced and distributed on the first end face.

12. The driving structure according to claim 10, characterized in that, The body has a second end face opposite to the first end face, and the second end face has a mounting portion for fixing to the driver, the cross-sectional dimension of the mounting portion being larger than the cross-sectional dimension of the body.

13. An elevator, characterized in that, Includes the drive structure as described in any one of claims 1-12.

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