Transmission belt adjusting mechanism and elevator

Abstract

The transmission belt adjusting mechanism comprises a car door upper sill and a tensioning device, the tensioning device comprises a tensioning support, a limiting wheel set and a tensioning wheel, the tensioning support is movably arranged on the car door upper sill, the tensioning wheel is rotationally connected with the tensioning support, a belt is wound around the tensioning wheel, and the limiting wheel set is arranged on the limiting wheel set. The limiting wheel set is arranged on the tensioning support and arranged on the radial side of the tensioning wheel, and the limiting wheel set is matched with the belt in a limiting mode. When an elevator runs for a long time due to part loss and displacement, the limiting wheel set can prevent the belt from shifting, so that the belt is prevented from scraping a motor side, a tensioning wheel and the like, the abrasion of the belt is effectively reduced, the service life of the belt is prolonged, and meanwhile harsh noise can be avoided. And the elevator running quietness is improved, so that the elevator taking comfort and experience of passengers are improved.

Description

Technical Field

[0001] The present application relates to the technical field of elevator car door transmission, and in particular to a transmission belt adjustment mechanism and an elevator. Background Art

[0002] The elevator drive belt adjustment mechanism is an important part of the elevator as a driving system that controls the opening or closing of the elevator car door. Among them, the belt drive mechanism is a commonly used transmission structure in the elevator drive belt adjustment mechanism, especially the synchronous belt mechanism with high transmission efficiency and stable transmission ratio. After the elevator has been running for a long time, due to motion loss and displacement, the belt will also be displaced, causing the belt to scrape against the flange edge of the synchronous pulley on the motor side and the tensioning side, resulting in serious belt wear and reduced service life. In addition, the scraping will also be accompanied by harsh noise, affecting the passengers' elevator riding experience and comfort. Summary of the invention

[0003] Based on this, it is necessary to provide a transmission belt adjustment mechanism and an elevator to address the problems of severe wear, short service life, and scratching and noise that affect the comfort and experience of riding the elevator.

[0004] On the one hand, the present application provides a transmission belt adjustment mechanism, which includes:

[0005] The upper edge of the sedan door; and

[0006] The tensioning device includes a tensioning bracket, a limiting wheel group and a tensioning wheel. The tensioning bracket can be movably mounted on the upper sill of the car door. The tensioning wheel is rotatably connected to the tensioning bracket. A belt is wound around the tensioning wheel. The limiting wheel assembly is mounted on the tensioning bracket and arranged on one radial side of the tensioning wheel. The limiting wheel group cooperates with the belt for limiting.

[0007] The transmission belt adjustment mechanism of this scheme is applied in elevators and is used for assembly and cooperation of car doors to realize automatic opening and closing of car doors, wherein the tensioning device is connected to the belt to adjust the tension when the belt is loose. Since the tensioning bracket in the tensioning device is respectively equipped with a limit wheel set and a tensioning wheel, and the belt wound around the outside of the tensioning wheel is limited by the limit wheel set, the limit wheel set plays a role in limiting the belt. When the elevator is running for a long time and parts are worn out and shifted, the limit wheel set can prevent the belt from shifting, so that the belt avoids scratching with the motor side, the tensioning wheel, etc., which not only effectively reduces the belt wear and helps to extend the service life of the belt, but also avoids harsh noise, improves the quietness of the elevator operation, and thus improves the comfort and experience of passengers riding the elevator.

[0008] The technical solution of this application is further described below:

[0009] In one embodiment, the limiting wheel assembly includes a limiting pressure wheel, the wheel diameter of the limiting pressure wheel is smaller than the wheel diameter of the tensioning wheel, and limiting ribs are provided at both axial ends of the limiting pressure wheel, and the two limiting ribs extend out of the wheel circumference of the limiting pressure wheel along the radial direction of the limiting pressure wheel and cooperate to form a limiting groove, and the belt is accommodated in the limiting groove; wherein, the contact area between the limiting rib and the belt is less than or equal to one half of the belt thickness value.

[0010] In one embodiment, the limiting wheel group also includes a limiting bolt group, the limiting pressure wheel is installed on the limiting bolt group, the tensioning bracket is provided with a first long slot hole extending laterally, and the upper sill of the car door is provided with a second long slot hole longitudinally aligned with the first long slot hole, and the limiting bolt group can be slidably penetrated into the first long slot hole and the second long slot hole.

[0011] In one embodiment, the limiting wheel set further includes at least one gasket, and the gasket is disposed between the first end of the limiting pressure wheel and the upper sill of the car door;

[0012] Alternatively, the limiting wheel assembly further includes at least one gasket, and the gasket is disposed between the second end of the limiting pressure wheel and the tensioning bracket.

[0013] In one of the embodiments, a flange is provided at one of the two axial ends of the tension wheel, and a safety distance is formed between the belt and the flange; or, no flange is provided at either axial end of the tension wheel.

[0014] In one embodiment, the tensioning device also includes an auxiliary bracket, an adjusting screw and a mounting bolt group. The auxiliary bracket is fixed to the upper sill of the car door and is arranged laterally spaced apart from the tensioning bracket. The adjusting screw connects the auxiliary bracket and the tensioning bracket. The tensioning bracket is movably mounted on the upper sill of the car door through the mounting bolt group.

[0015] In one embodiment, the transmission belt adjustment mechanism further comprises a power source, a belt entrainment mechanism and a driving assembly, wherein the power source is mounted on the upper sill of the car door and is arranged laterally spaced apart from the tensioning device, and the belt is wound around a driving wheel of the power source;

[0016] The belt is configured as an open belt, so that the belt includes a first belt end and a second belt end opposite to each other, the entrainment mechanism includes a entrainment bolt group, a belt clamping block and a belt connecting plate, the entrainment bolt group connects the belt clamping block and the belt connecting plate, the first belt end and the second belt end are clamped between the belt clamping block and the belt connecting plate, the driving assembly is disposed on the belt connecting plate and connected to the belt clamping block to drive the belt clamping block to move relative to the belt connecting plate toward or away from the upper sill of the car door.

[0017] In one of the embodiments, the belt connecting plate is provided with a slide groove, and a slider is provided at the bottom of the belt clamping block, and the slider can be slidably inserted into the slide groove.

[0018] In one embodiment, the driving assembly includes a worm wheel, a worm, a fixed seat and a rotation assist rod, the belt clamp is provided with a mounting hole, one end of the worm is inserted and fixed in the mounting hole, and the other end of the worm is mounted on the belt connecting plate through the fixed seat, the worm wheel is detachably rotatably arranged on the belt connecting plate and meshes with the worm, and the rotation assist rod is arranged on the worm wheel.

[0019] On the other hand, the present application also proposes an elevator, which comprises the transmission belt adjusting mechanism as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the structure of a transmission belt adjustment mechanism according to an embodiment of the present application.

[0023] Figure 2 It is a front view structural schematic diagram of a tensioning device of an embodiment.

[0024] Figure 3 for Figure 2 Top view of the structure.

[0025] Figure 4 The present invention is a schematic structural diagram of the installation of a belt clamping mechanism, a first belt end and a second belt end according to an embodiment.

[0026] Figure 5 It is the assembly structure diagram of the drive component and the entrainment mechanism.

[0027] Figure 6 for Figure 5 Schematic diagram of the right view structure.

[0028] Description of reference numerals:

[0029] 100, transmission belt adjustment mechanism; 10, car door sill; 20, tensioning device; 21, tensioning bracket; 211, first long slot hole; 22, limiting wheel group; 221, limiting pressure wheel; 221a, limiting retaining edge; 221b, limiting groove; 222, limiting bolt group; 23, tensioning wheel; 231, flange edge; 24, auxiliary bracket; 25, adjusting screw; 26, mounting bolt group; 30, belt; 31, first belt end; 32, second belt end; 40, power source; 50, clamping mechanism; 51, clamping bolt group; 52, belt clamping block; 521, mounting hole; 53, belt connecting plate; 531, slide groove; 54, slider; 60, driving assembly; 61, worm wheel; 62, worm; 63, fixing seat; 64, rotating power lever. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] See also Figure 1, is a transmission belt adjustment mechanism 100 shown in an embodiment of the present application, which includes a car door sill 10 and a tensioning device 20, and the tensioning device 20 is arranged at one end of the car door sill 10 in the horizontal length direction (the left end as shown in the figure). In addition, the transmission belt adjustment mechanism 100 also includes a power source 40, a belt entrainment mechanism 50 and a driving assembly 60, and the power source 40 is installed on the car door sill 10 and is arranged in a horizontal interval with the tensioning device 20, that is, the power source 40 is arranged at the other end of the car door sill 10 in the horizontal length direction (the right end as shown in the figure).

[0037] Please continue reading Figure 2 and Figure 3 The tensioning device 20 includes a tensioning bracket 21, a limiting wheel group 22 and a tensioning wheel 23. The tensioning bracket 21 is movably mounted on the upper sill of the car door 10. The tensioning wheel 23 is rotatably connected to the tensioning bracket 21. A belt 30 is wound around the tensioning wheel 23, and the belt 30 is wound around the driving wheel of the power source 40. The limiting wheel group 22 is mounted on the tensioning bracket 21 and arranged on the radial side of the tensioning wheel 23. The limiting wheel group 22 is limited by the belt 30.

[0038] During operation, the power source 40 (such as a motor) drives the driving wheel to rotate, thereby linking the belt 30 and the tensioning wheel 23. The belt 30 is connected to the left door panel and the right door panel through the left door hanging assembly and the right door hanging assembly, respectively, thereby achieving the purpose of driving the left door panel and the right door panel to close or open.

[0039] The transmission belt adjustment mechanism 100 of the present solution is applied to the elevator, and is used for the assembly and cooperation of the car door to realize the automatic driving opening and closing action of the car door, wherein the tensioning device 20 is connected with the belt 30, and is used for tensioning and adjusting the belt 30 when the belt 30 is loose. Since the tensioning bracket 21 in the tensioning device 20 is respectively installed with the limiting wheel set 22 and the tensioning wheel 23, and the belt 30 wound around the outside of the tensioning wheel 23 is limited by the limiting wheel set 22, the limiting wheel set 22 plays a limiting role on the belt 30. When the elevator runs for a long time and the components are worn out and shifted, the limiting wheel set 22 can prevent the belt 30 from shifting, so that the belt 30 avoids scratching with the motor side, the tensioning wheel 23, etc., which not only effectively reduces the wear of the belt 30 and helps to extend the service life of the belt 30, but also avoids the occurrence of harsh noise, improves the quietness of the elevator operation, and thus improves the comfort and experience of passengers riding the elevator.

[0040] Please continue reading Figure 2 and Figure 3In some optional embodiments, the limiting wheel assembly 22 includes a limiting pressure wheel 221, the wheel diameter of the limiting pressure wheel 221 is smaller than the wheel diameter of the tensioning wheel 23, and limiting ribs 221a are provided at both axial ends of the limiting pressure wheel 221. The two limiting ribs 221a extend out of the circumferential surface of the limiting pressure wheel 221 along the radial direction of the limiting pressure wheel 221 and cooperate to form a limiting groove 221b, and the belt 30 is accommodated in the limiting groove 221b.

[0041] Therefore, when the belt 30 is inserted into the limiting groove 221b, the two sides of the belt 30 in the width direction can be blocked and limited by the limiting ribs 221a on both sides, which play a limiting role in the position of the belt 30 and prevent the belt 30 from shifting. And because the wheel diameter of the limiting pressure wheel 221 is smaller than the tension wheel 23, the extension length of the limiting rib 221a is small, for example, the contact area between the limiting rib 221a and the belt 30 is less than or equal to half of the thickness of the belt 30, and the contact area between the limiting rib 221a and the belt 30 is small, so that the loss caused by the friction between the belt 30 and the limiting pressure wheel 221 and the noise caused by the scraping are significantly reduced.

[0042] The limiting pressure wheel 221 is rotatably mounted on the tensioning bracket 21 and the upper sill of the car door 10, and in actual operation, when the belt 30 is not in contact with the limiting pressure wheel 221, the limiting pressure wheel 221 does not rotate and only limits the belt 30. In view of this, the limiting pressure wheel 221 can be optionally made of a smooth plastic part to reduce the relative sliding friction resistance with the belt 30 and reduce noise.

[0043] On the basis of the above embodiment, the limiting wheel group 22 further includes a limiting bolt group 222, the limiting pressure wheel 221 is installed on the limiting bolt group 222, the tensioning bracket 21 is provided with a first long slot hole 211 extending transversely, the upper sill of the car door 10 is provided with a second long slot hole longitudinally aligned with the first long slot hole 211, and the limiting bolt group 222 can be slidably penetrated in the first long slot hole 211 and the second long slot hole. When the limiting bolt group 222 is loosened, the limiting bolt group 222 slides along the first long slot hole 211 and the second long slot hole, so that the lateral position of the limiting pressure wheel 221 can be adjusted to adapt to the installation of belts 30 of different thicknesses.

[0044] Furthermore, the limiting wheel set 22 further includes at least one gasket, which is disposed between the first end of the limiting pressure wheel 221 and the upper sill 10 of the car door; or, the limiting wheel set 22 further includes at least one gasket, which is disposed between the second end of the limiting pressure wheel 221 and the tensioning bracket 21. Adding a gasket can achieve the longitudinal position adjustment of the limiting pressure wheel 221. That is, by adjusting the lateral and longitudinal positions of the limiting pressure wheel 221, the position of the belt 30 in the depth direction can be more accurately limited.

[0045] Compared with the existing method in which flange edges 231 are provided at both axial ends of the tension wheel 23, in some optional embodiments of the present application, a flange edge 231 is provided at one of the two axial ends of the tension wheel 23, and a safety distance is formed between the belt 30 and the flange edge 231; or, no flange edge 231 is provided at both axial ends of the tension wheel 23.

[0046] When the tension wheel 23 is provided with a flange 231 at only one end, the belt 30 is positioned by the limiting pressure wheel 221, so that a safe distance can be formed between the belt 30 and the flange 231, thereby avoiding a large area of ​​contact friction between the belt 30 and the flange 231, which causes serious wear of the belt 30 and generates loud noise. If the tension wheel 23 is not provided with a flange 231, the structure of the tension wheel 23 is simplified, which is easier to manufacture and reduce costs, and is convenient to install.

[0047] Please continue reading Figure 2 and Figure 3 In addition, based on any of the above embodiments, the tensioning device 20 also includes an auxiliary bracket 24, an adjusting screw 25 and a mounting bolt group 26. The auxiliary bracket 24 is fixed to the upper sill of the car door 10 and is arranged laterally spaced from the tensioning bracket 21. The adjusting screw 25 connects the auxiliary bracket 24 and the tensioning bracket 21. The tensioning bracket 21 is movably mounted on the upper sill of the car door 10 through the mounting bolt group 26.

[0048] When the belt 30 is stretched and deformed and becomes loose after working for a long time, and needs to be adjusted and tensioned again, loosen the mounting bolt group 26, turn the adjusting screw 25 to pull the tensioning bracket 21 closer to the auxiliary bracket 24, and then drive the tensioning wheel 23 to tighten the belt 30. Finally, tighten the mounting bolt group 26 to complete the tensioning adjustment of the belt 30. The operation is convenient and labor-saving.

[0049] Please continue reading Figure 4 In order to improve the installability, the belt 30 in the present application is set as an open belt, that is, the belt 30 is not a complete annular closed belt, so that the belt 30 includes a first belt end 31 and a second belt end 32 relative to each other, and the entrainment mechanism 50 includes an entrainment bolt group 51, a belt clamping block 52 and a belt connecting plate 53. The entrainment bolt group 51 connects the belt clamping block 52 and the belt connecting plate 53, and the first belt end 31 and the second belt end 32 are clamped between the belt clamping block 52 and the belt connecting plate 53. The driving assembly 60 is arranged on the belt connecting plate 53 and connected to the belt clamping block 52 to drive the belt clamping block 52 to move relative to the belt connecting plate 53 toward or away from the upper sill 10 of the car door.

[0050] By operating the driving assembly 60 to drive the belt clamp 52 to move away from the car door sill 10, the horizontal distance between the belt 30 and the car door sill 10 can be appropriately increased, so that the displaced belt 30 is out of contact with the car door sill 10 again, avoiding the rotation of the belt 30 and the scratching of the car door sill 10 to generate noise and wear.

[0051] Please continue reading Figure 5 and Figure 6 Specifically, in some optional embodiments, the driving assembly 60 includes a worm wheel 61, a worm 62, a fixed seat 63 and a rotation assist rod 64. The belt clamp 52 is provided with a mounting hole 521. One end of the worm 62 is inserted and fixed in the mounting hole 521. The other end of the worm 62 is mounted on the belt connecting plate 53 through the fixed seat 63. The worm wheel 61 is detachably rotatably arranged on the belt connecting plate 53 and meshes with the worm 62. The rotation assist rod 64 is arranged on the worm wheel 61.

[0052] The worm wheel 61 can be driven to rotate by operating the rotation power lever 64, thereby driving the worm 62 to rotate and move away from or close to the upper sill of the car door 10 along its own axis. Since one end of the worm 62 is plugged into the mounting hole 521, the belt clamp 52 can be synchronously driven to move away from or close to the upper sill of the car door 10, so as to achieve the purpose of adjusting the horizontal distance L between the belt 30 and the upper sill of the car door 10. Compared with the manual adjustment method adopted in the traditional technology, the transmission accuracy of the worm wheel 61 and the worm 62 is high, which can effectively improve the adjustment accuracy of the position of the belt 30 and prevent the belt 30 from loosening. In addition, the adjustment operation is convenient, labor-saving and efficient.

[0053] Furthermore, the worm gear 61 is detachable and can be used as a special maintenance tool. After the adjustment operation is completed, the worm gear 61 can be removed, which is convenient for management and avoids occupying elevator space.

[0054] Furthermore, in order to improve the movement accuracy and stability of the belt clamping block 52 , the belt connecting plate 53 is provided with a slide groove 531 , and a slider 54 is provided at the bottom of the belt clamping block 52 , and the slider 54 can be slidably inserted into the slide groove 531 .

[0055] In addition to the above, the present application further proposes an elevator, which includes the transmission belt adjustment mechanism 100 as described in any of the above embodiments.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A transmission belt adjustment mechanism, It is characterized in that include: The door of the sedan chair is on the sill; as well as, The tensioning device includes a tensioning bracket, a limiting wheel group and a tensioning wheel. The tensioning bracket can be movably mounted on the upper sill of the car door. The tensioning wheel is rotatably connected to the tensioning bracket. A belt is wound around the tensioning wheel. The limiting wheel assembly is mounted on the tensioning bracket and arranged on one radial side of the tensioning wheel. The limiting wheel group cooperates with the belt for limiting.

2. The transmission belt adjustment mechanism according to claim 1, It is characterized in that The limiting wheel assembly includes a limiting pressure wheel, the wheel diameter of the limiting pressure wheel is smaller than the wheel diameter of the tensioning wheel, and limiting ribs are provided at both axial ends of the limiting pressure wheel, and the two limiting ribs extend out of the wheel circumference of the limiting pressure wheel along the radial direction of the limiting pressure wheel and cooperate to form a limiting groove, and the belt is accommodated in the limiting groove; wherein, the contact area between the limiting rib and the belt is less than or equal to one half of the belt thickness value.

3. The transmission belt adjustment mechanism according to claim 2, It is characterized in that The limiting wheel group also includes a limiting bolt group, the limiting pressure wheel is installed on the limiting bolt group, the tensioning bracket is provided with a first long slot hole extending laterally, and the upper sill of the car door is provided with a second long slot hole longitudinally aligned with the first long slot hole, and the limiting bolt group can be slidably penetrated into the first long slot hole and the second long slot hole.

4. The transmission belt adjustment mechanism according to claim 2, It is characterized in that The limiting wheel set further comprises at least one gasket, which is disposed between the first end of the limiting pressure wheel and the upper sill of the car door; Alternatively, the limiting wheel assembly further includes at least one gasket, and the gasket is disposed between the second end of the limiting pressure wheel and the tensioning bracket.

5. The transmission belt adjustment mechanism according to claim 1, It is characterized in that One of the two axial ends of the tension wheel is provided with a flange, and a safety distance is formed between the belt and the flange; or, no flange is provided at both axial ends of the tension wheel.

6. The transmission belt adjustment mechanism according to claim 1, It is characterized in that The tensioning device also includes an auxiliary bracket, an adjusting screw and a mounting bolt group. The auxiliary bracket is fixed to the upper sill of the car door and is arranged laterally spaced from the tensioning bracket. The adjusting screw connects the auxiliary bracket and the tensioning bracket. The tensioning bracket is movably mounted on the upper sill of the car door through the mounting bolt group.

7. The transmission belt adjustment mechanism according to claim 1, It is characterized in that The transmission belt adjustment mechanism also includes a power source, a belt entrainment mechanism and a driving assembly, wherein the power source is installed on the upper sill of the car door and is arranged laterally spaced from the tensioning device, and the belt is wound around the driving wheel of the power source; The belt is configured as an open belt, so that the belt includes a first belt end and a second belt end opposite to each other, the entrainment mechanism includes a entrainment bolt group, a belt clamping block and a belt connecting plate, the entrainment bolt group connects the belt clamping block and the belt connecting plate, the first belt end and the second belt end are clamped between the belt clamping block and the belt connecting plate, the driving assembly is disposed on the belt connecting plate and connected to the belt clamping block to drive the belt clamping block to move relative to the belt connecting plate toward or away from the upper sill of the car door.

8. The transmission belt adjustment mechanism according to claim 7, It is characterized in that The belt connecting plate is provided with a slide groove, and the bottom of the belt clamping block is provided with a slider, and the slider can be slidably inserted into the slide groove.

9. The transmission belt adjustment mechanism according to claim 7, It is characterized in that The driving assembly includes a worm wheel, a worm, a fixed seat and a rotation assist rod. The belt clamp is provided with a mounting hole. One end of the worm is inserted and fixed in the mounting hole. The other end of the worm is mounted on the belt connecting plate through the fixed seat. The worm wheel is detachably rotatably arranged on the belt connecting plate and meshes with the worm. The rotation assist rod is arranged on the worm wheel.

10. An elevator, It is characterized in that The invention comprises a transmission belt adjusting mechanism as claimed in any one of claims 1 to 9.

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