Adjusting assembly of belt transmission device, belt transmission device and platform door

Abstract

The utility model provides an adjusting assembly of a belt transmission device, the belt transmission device and a platform door, the belt transmission device comprises a transmission belt and a driven wheel, and the adjusting assembly comprises a fixing component, a mounting component and an adjusting component. The mounting component is arranged on the fixing component and suitable for mounting the driven wheel. The adjusting component is arranged between the mounting component and the fixing component, and the adjusting component is detachably connected to the mounting component and / or the fixing component in at least two opposite positions in the first direction, so that the mounting component is fixed relative to the fixing component in at least two positions. According to the adjusting assembly of the belt transmission device, the adjusting assembly serves as a mounting and connecting part of the belt transmission device, so that the assembling of the adjusting assembly can be completed by the assembling of the belt transmission device, the assembling steps are simplified, and the assembling difficulty is reduced.

Description

Technical Field

[0001] The utility model generally relates to the technical field of tension adjustment components, and more specifically relates to an adjustment component of a belt transmission device, a belt transmission device and a platform door. Background Art

[0002] At present, the existing platform door driving device adopts the driving form of a pulley, and the belt tensioning adjustment component and the driven pulley are respectively independent, and the driving device and the adjustment component need to be installed separately, which is relatively cumbersome to install. Utility Model Content

[0003] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0004] In order to at least partially solve the above problems, the utility model provides an adjustment assembly of a belt transmission device in a first aspect, wherein the belt transmission device comprises a transmission belt and a driven wheel, and the adjustment assembly comprises:

[0005] Fixed components;

[0006] A mounting member, the mounting member being disposed on the fixing member, the mounting member being suitable for mounting the driven wheel; and

[0007] An adjusting member is disposed between the mounting member and the fixing member, and is detachably connected to the mounting member and / or the fixing member at at least two relative positions along a first direction, so that the mounting member is fixed relative to the fixing member at at least two positions.

[0008] According to the adjustment component of the belt transmission device of the first aspect of the utility model, the position of the mounting component along the first direction can be adjusted by the adjusting component being detachably connected relative to the fixing component or the fixing component being detachably connected at at least two positions along the first direction, thereby adjusting the position of the driven wheel and realizing the adjustment of the tension of the transmission belt; and the mounting component is suitable for installing the driven wheel, so that the adjustment component serves as the installation and connection component of the belt transmission device, and the assembly of the belt transmission device can complete the assembly of the adjustment component, thereby simplifying the assembly steps and reducing the assembly difficulty.

[0009] Optionally, the adjusting member is provided with a threaded portion, the mounting member is provided with a threaded hole extending along the first direction, and the threaded hole is threadably matched with the threaded portion;

[0010] The adjustment assembly further includes at least two adjustment nuts, which are sleeved on the adjustment member and threadedly connected with the adjustment member, and at least two adjustment nuts are arranged on both sides of at least a portion of the fixing member along the first direction.

[0011] Optionally, the fixing member includes a first bending plate, which is perpendicular to the first direction and is provided with a fixing groove suitable for passing the adjusting member, and the adjusting nut is arranged on both sides of the fixing groove; the mounting member includes a second bending plate, which is arranged parallel to the first bending plate, and the threaded hole is arranged in the second bending plate.

[0012] Optionally, one of the fixing member and the mounting member has a recessed portion, and the other of the fixing member and the mounting member has a protruding portion, wherein the recessed portion extends along the first direction; and the protruding portion at least partially extends to the recessed portion along a second direction perpendicular to the first direction.

[0013] Optionally, the protrusion is constructed as a column and is provided with a thread, the recessed portion is constructed as a hole, the protrusion is passed through the recessed portion, the protrusion is provided with a fastening nut, the fastening nut is sleeved on the protrusion and threadedly connected to the protrusion, and the fastening nut is suitable for abutting against the mounting component or the fixing component.

[0014] Optionally, the fixing member includes a first connecting plate, which is parallel to the first direction; the mounting member includes a second connecting plate, which is arranged parallel to the first connecting plate; the protrusion is arranged on one of the first connecting plate and the second connecting plate, and the recessed portion is arranged on the other of the first connecting plate and the second connecting plate.

[0015] Optionally, the protrusion is provided on the first connecting plate, the recess is provided on the second connecting plate, and the fastening nut is suitable for abutting against a side of the second connecting plate away from the first connecting plate.

[0016] Optionally, the protrusion is provided on the second connecting plate, the recess is provided on the first connecting plate, and the fastening nut is suitable for abutting against a side of the first connecting plate away from the second connecting plate.

[0017] A second aspect of the utility model provides a belt transmission device, comprising:

[0018] Drive components;

[0019] a driving wheel connected to the driving element;

[0020] a driven wheel, the driven wheel being spaced apart from the driving wheel along a first direction;

[0021] a transmission belt, wherein a first end of the transmission belt is sleeved on the driving wheel, and a second end of the transmission belt is sleeved on the driven wheel; and

[0022] According to the above-mentioned adjusting assembly of the belt transmission device, the mounting member is connected to the driven wheel.

[0023] According to the belt transmission device of the second aspect of the utility model, the tension of the transmission belt can be adjusted by the adjusting component, and the adjusting component serves as the installation and connection component of the belt transmission device. Therefore, the assembly of the belt transmission device can complete the assembly of the adjusting component, which simplifies the assembly steps and reduces the difficulty of assembly.

[0024] A third aspect of the utility model provides a platform door, comprising:

[0025] track;

[0026] a movable door movably connected to the track along a first direction; and

[0027] According to the above-mentioned belt transmission device, the transmission belt is fixedly connected to the movable door.

[0028] According to the platform door of the third aspect of the utility model, the belt transmission device used can adjust the tension, and the assembly steps are simple and the assembly difficulty is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0030] Figure 1 A bottom view of an adjustment assembly of a belt transmission device according to a preferred embodiment of the utility model;

[0031] Figure 2 A side view of an adjustment assembly of a belt transmission device according to a preferred embodiment of the utility model;

[0032] Figure 3 for Figure 1 Exploded view of the regulating component in;

[0033] Figure 4 A schematic diagram of a platform door according to a preferred embodiment of the utility model;

[0034] Figure 5 for Figure 4 Schematic diagram of the positions of the movable doors and fixed doors in the platform doors;

[0035] Figure 6 It is a structural schematic diagram of one side of the sliding door;

[0036] Figure 7 for Figure 6 An enlarged schematic diagram of part A in FIG.

[0037] Figure 8 for Figure 6 An enlarged schematic diagram of part B in FIG.

[0038] Fig. 9 is a schematic diagram of the structure on the other side of the sliding door; and

[0039] Fig.10 for Fig. 9 An enlarged schematic diagram of part C in FIG.

[0040] Description of Reference Numerals

[0041] 100: fixing member 101: first connecting plate

[0042] 102: first bending plate 103: recessed portion

[0043] 104: fixing groove 105: third connecting plate

[0044] 106: Mounting hole 110: Mounting component

[0045] 111: second connecting plate 112: second bending plate

[0046] 113: protrusion 114: fastening nut

[0047] 115: threaded hole 120: adjustment member

[0048] 130: Adjusting nut 140: Rotating shaft

[0049] 141: elastic washer 142: retaining ring

[0050] 143: Fastening screw 150: Sliding door

[0051] 151: Fixed door 152: Pillar

[0052] 153: Threshold 154: Track

[0053] 155: Mobile vehicle 156: Clamp

[0054] 160: Belt drive 161: Driving element

[0055] 162: driving wheel 163: driven wheel

[0056] 164: Drive belt D1: First direction

[0057] D2: Second direction D3: Third direction DETAILED DESCRIPTION

[0058] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0059] In this document, ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0060] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0061] In this document, “equal”, “same”, etc. are not strictly limited in mathematical and / or geometric senses, but also include errors that can be understood by those skilled in the art and allowed by manufacturing or use.

[0062] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0063] Figures 1 to 3 The utility model shows an adjustment assembly of a belt transmission device 160, the belt transmission device 160 includes a transmission belt 164 and a driven wheel 163, and the adjustment assembly includes a fixing member 100, a mounting member 110 and an adjustment member 120. The mounting member 110 is disposed on the fixing member 100, and the mounting member 110 is suitable for mounting the driven wheel 163. The adjustment member 120 is disposed between the mounting member 110 and the fixing member 100, and the adjustment member 120 is detachably connected to the mounting member 110 and / or the fixing member 100 at at least two relative positions along a first direction D1, so that the mounting member 110 is fixed relative to the fixing member 100 at at least two positions.

[0064] According to the adjustment assembly of the belt transmission device 160 of the utility model, the adjustment member 120 is detachably connected with the fixing member 100 or the mounting member 110 at at least two positions along the first direction D1, so that the position of the mounting member 110 along the first direction D1 can be adjusted, and then the position of the driven wheel 163 can be adjusted to adjust the tension of the transmission belt 164. The mounting member 110 is suitable for mounting the driven wheel 163, so that the adjustment assembly serves as the mounting and connecting component of the belt transmission device 160, so that the assembly of the belt transmission device 160 can complete the assembly of the adjustment assembly, simplifying the assembly steps and reducing the assembly difficulty.

[0065] Further, the fixing member 100 is suitable for fixing at the location of the belt transmission device 160, that is, the fixing member 100 is connected to a structure such as a base on which the belt transmission device 160 is installed. Alternatively, the fixing member 100 directly serves as the base of the transmission device 160, so that the adjustment assembly can be used as an installation and connection component of the belt transmission device 160.

[0066] Further, by Figure 1 It can be seen that the first direction D1 is parallel to the extending direction of the transmission belt 164 of the belt transmission device 160 .

[0067] Optionally, refer to Figure 3 The adjusting member 120 is constructed as a screw, that is, the adjusting member 120 is provided with a threaded portion (not shown in the figure), and the mounting member 110 is provided with a threaded hole 115 extending along the first direction D1, and the threaded hole 115 is threadedly matched with the threaded portion. By rotating the adjusting member 120, the mounting member 110 can be adjusted relative to the adjusting member 120 along the first direction D1, thereby realizing the adjustment of the tension of the transmission belt 164.

[0068] Optionally, the adjustment assembly further includes at least two adjustment nuts 130, such as Figure 3 As shown, the adjustment assembly includes two adjustment nuts 130, both of which are sleeved on the adjustment member 120 and threadedly connected with the adjustment member 120, and the two adjustment nuts 130 are arranged along the first direction D1 to at least part of both sides of the fixing member 100, so that by tightening the two adjustment nuts 130, the adjustment member 120 and the fixing member 100 can be fixed together, and the detachable connection between the adjustment member 120 and the fixing member 100 is achieved. In addition, through the two adjustment nuts 130, the adjustment member 120 can be moved along the first direction D1 and then the two adjustment nuts 130 can be tightened to fix the adjustment member 120 and the fixing member 100 together, and the adjustment of the mounting member 110 can also be achieved.

[0069] In a preferred embodiment, the positions of the mounting member 110 and the driven wheel 163 along the first direction D1 are adjusted by rotating the adjusting member 120, and then the two adjusting nuts 130 are tightened to fix the adjusting member 120 and the fixing member 100 together, so that the positions of the mounting member 110 and the driven wheel 163 along the first direction D1 are stabilized.

[0070] Optionally, refer to Figure 1 and Figure 3 The fixing member 100 includes a first bending plate 102, the first bending plate 102 is perpendicular to the first direction D1, the first bending plate 102 is provided with a fixing groove 104, the fixing groove 104 can be connected to one side of the first bending plate 102 along the second direction D2, and the fixing groove 104 is suitable for passing the adjustment member 120. Two adjustment nuts 130 are arranged on both sides of the fixing groove 104.

[0071] The mounting member 110 includes a second bending plate 112, which is arranged parallel to the first bending plate 102, and the threaded hole 115 is arranged on the second bending plate 112. Through the arrangement of the first bending plate 102 and the second bending plate 112, the fixing member 100 and the mounting member 110 have sufficient connection areas on the surface perpendicular to the first direction D1, which is convenient for installing the adjusting member 120.

[0072] Reference Figure 3 The mounting member 110 further includes a first connecting plate 101, which is parallel to the first direction D1. The first connecting plate 101 and the first bending plate 102 are connected together, so that the orthographic projection of the fixing member 100 along the third direction D3 is L-shaped as a whole. Similarly, the mounting member 110 further includes a second connecting plate 111, which is arranged parallel to the first connecting plate 101. The second connecting plate 111 and the second bending plate 112 are connected together, so that the orthographic projection of the mounting member 110 along the third direction D3 is L-shaped as a whole. The mounting member 110 and the fixing member 100 have high structural strength, compact structure, and low manufacturing cost.

[0073] Optionally, one of the fixing member 100 and the mounting member 110 has a recessed portion 103, and the other of the fixing member 100 and the mounting member 110 has a protruding portion 113, the recessed portion 103 extends along the first direction D1, and the protruding portion 113 at least partially extends to the recessed portion 103 along the second direction D2, so that the mounting member 110 can move along the first direction D1 relative to the fixing member 100. Further, the protruding portion 113 is provided on one of the first connecting plate 101 and the second connecting plate 111, and the recessed portion 103 is provided on the other of the first connecting plate 101 and the second connecting plate 111, so that the fixing member 100 and the mounting member 110 move relative to each other through the cooperation between the first connecting plate 101 and the second connecting plate 111, which can ensure that the fixing member 100 and the mounting member 110 have sufficient relative movement stroke.

[0074] Specifically, the protrusion 113 is configured as a column and is provided with a thread, and the recessed portion 103 is configured as a hole, so that the protrusion 113 can be inserted into the recessed portion 103 along the second direction D2, so that the protrusion 113 can move relatively along the extension direction of the recessed portion 103, so that the fixing member 100 and the mounting member 110 are movably arranged. The protrusion 113 can also be formed by welding a stud to the mounting member 110 or the fixing member 100. The protrusion 113 is provided with a fastening nut 114, which is sleeved on the protrusion 113 and threadedly connected with the protrusion 113. When the fastening nut 114 is tightened, it abuts against the fixing member 100 or the mounting member 110, so that the mounting member 110 can be fixed relative to the fixing member 100 after adjustment. In addition, the setting of the fastening nut 114 enables a limiting effect between the mounting member 110 and the fixing member 100 along the second direction D2, thereby preventing the mounting member 110 from being separated from the fixing member 100 during the adjustment process.

[0075] Alternatively, if Figure 3 As shown, the protrusion 113 is provided on the second connecting plate 111, and the recess 103 is provided on the first connecting plate 101. When the fastening nut 114 is tightened, it abuts against the side of the first connecting plate 101 away from the second connecting plate 111, so that the mounting member 110 can be adjusted and fixed relative to the fixing member 100. The mounting member 110 and the fixing member 100 can also be provided with four groups of recesses 103 and protrusions 113, and the four groups of recesses 103 and protrusions 113 are arranged along the first direction D1 and the third direction D3, so that the movement of the mounting member 110 relative to the fixing member 100 along the first direction D1 is more stable.

[0076] As an alternative, the protrusion 113 may be provided on the first connecting plate 101, and the recessed portion 103 may be provided on the second connecting plate 111, so that when the fastening nut 114 is tightened, it abuts against the side of the second connecting plate 111 away from the first connecting plate 101, and the mounting component 110 may be adjusted and fixed relative to the fixing component 100.

[0077] Reference Figure 3 The fixing member 100 further includes a third connecting plate 105, which is connected to the first connecting plate 101. The third connecting plate 105 is provided with a mounting hole 106, which is suitable for connecting to a base structure where the belt transmission device 160 is located (such as the threshold 153 of the platform door described later, etc.).

[0078] Figures 4 to 10 A platform door according to the present invention is shown, comprising a track 154, a movable door 150 and a belt transmission device 160. The movable door 150 is movably connected to the track 154 along a first direction D1. The transmission belt 164 is fixedly connected to the movable door 150. According to the platform door of the present invention, the belt transmission device 160 used can adjust the tension, and the assembly steps are simple and the assembly difficulty is small.

[0079] For details, refer to Figure 4 and Figure 5 The platform door further includes a fixed door 151. The fixed door 151 and the movable door 150 are arranged along the first direction D1. The movable door 150 moves along the first direction D1 to a position overlapping with the fixed doors 151 on both sides under the traction of the transmission belt 164, so that the initial position of the movable door 150 is opened, which is convenient for people to enter and exit the train. Figure 5 The platform door further comprises a column 152 and a threshold 153. The column 152 is arranged at the side of the fixed door 151 and is suitable for fixing the fixed door 151. The threshold 153 is arranged at the bottom of the fixed door 151 and the movable door 150 and is used to close the gap between the platform door and the platform. The fixed door 151, the threshold 153 and the column 152 are all fixed relative to the platform, and the belt transmission device 160 is arranged below the threshold 153 and will not be disturbed by the outside world.

[0080] Reference Figure 6 The platform door also includes a track 154 and a moving vehicle 155. The track 154 is arranged below the moving door 150 and extends along the first direction D1. The moving vehicle 155 is fixed to the bottom of the moving door 150. The moving vehicle 155 is movably connected to the slide rail along the first direction D1, so that the moving door 150 can slide along the first direction D1.

[0081] Figures 6 to 8Specifically, a belt transmission device 160 according to the utility model is shown, which includes a driving element 161, a driving wheel 162, a driven wheel 163, a transmission belt 164, and an adjustment assembly according to the above-mentioned belt transmission device 160. The driving wheel 162 is connected to the driving element 161. The driven wheel 163 is spaced apart from the driving wheel 162 along the first direction D1. The first end of the transmission belt 164 is sleeved to the driving wheel 162, and the second end of the transmission belt 164 is sleeved to the driven wheel 163. The mounting member 110 is connected to the driven wheel 163.

[0082] According to the belt transmission device 160 of the utility model, the tension of the transmission belt 164 can be adjusted by the adjustment component, and the adjustment component serves as the installation and connection component of the belt transmission device 160. Therefore, the assembly of the adjustment component can be completed by assembling the belt transmission device 160, which simplifies the assembly steps and reduces the difficulty of assembly.

[0083] Reference Figure 7 The driving element 161 may be a motor. When the driving element 161 is started, the driving wheel 162 rotates, and the driving belt 164 is driven by the driven wheel 163 to continuously move around in the first direction D1, thereby driving the movable door 150 .

[0084] Reference Fig. 9 and Fig.10 The platform door also includes a clamp block 156, which is fixed to the moving vehicle 155 by fasteners, and the clamp block 156 is sleeved on the transmission belt 164 and clamps the transmission belt 164, so that the transmission belt 164 and the moving door 150 are connected together, so that the transmission belt 164 can pull each moving door 150 to move.

[0085] Refer to Figure 3 and Figure 8 The belt transmission device 160 further includes a fastening screw 143, a rotating shaft 140, an elastic washer 141 and a retaining ring 142. The rotating shaft 140 sequentially passes through the driven wheel 163 and the second connecting plate 111 of the mounting member 110, so that the driven wheel 163 is mounted on the second connecting plate 111 and can rotate relative to the second connecting plate 111. The fastening screw 143 passes through the second connecting plate 111 and penetrates the rotating shaft 140, so that the rotating shaft 140 can be fixed by tightening the fastening screw 143, and the installation of the driven wheel 163 is realized. The retaining ring 142 and the elastic washer 141 are respectively arranged on both sides of the driven wheel 163 along the second direction D2, and are used to protect the end surface of the driven wheel 163 and reduce wear.

[0086] Reference Figure 6 and Figure 8The mounting member 110 is used as a connecting member for mounting the driven wheel 163, and the fixing member 100 limits the driven wheel 163 below the threshold 153. During the actual installation of the belt transmission device 160, the fixing member 100 is connected to the threshold 153 via the third connecting plate 105 to realize the installation of the driven wheel 163, and then the tension of the transmission belt 164 can be adjusted via the adjusting member 120.

[0087] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article may indicate that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0088] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of the protection claimed by the utility model.

Claims

1. An adjustment assembly for a belt transmission device, the belt transmission device comprising a transmission belt and a driven wheel, characterized in that: The adjustment component comprises: Fixed components; A mounting member, the mounting member being disposed on the fixing member, the mounting member being suitable for mounting the driven wheel; and An adjusting member is disposed between the mounting member and the fixing member, and is detachably connected to the mounting member and / or the fixing member at at least two relative positions along a first direction, so that the mounting member is fixed relative to the fixing member at at least two positions.

2. The adjustment assembly of the belt transmission device according to claim 1, characterized in that: The adjusting member is provided with a threaded portion, the mounting member is provided with a threaded hole extending along the first direction, and the threaded hole is threadably matched with the threaded portion; The adjustment assembly further includes at least two adjustment nuts, which are sleeved on the adjustment member and threadedly connected with the adjustment member, and at least two adjustment nuts are arranged on both sides of at least a portion of the fixing member along the first direction.

3. The adjustment assembly of the belt transmission device according to claim 2, characterized in that: The fixing member includes a first bending plate, which is perpendicular to the first direction and is provided with a fixing groove suitable for passing the adjusting member, and the adjusting nut is arranged on both sides of the fixing groove; the mounting member includes a second bending plate, which is arranged parallel to the first bending plate, and the threaded hole is arranged in the second bending plate.

4. The adjustment assembly of the belt transmission device according to claim 1, characterized in that: One of the fixing member and the mounting member has a recessed portion, and the other of the fixing member and the mounting member has a protruding portion, wherein the recessed portion extends along the first direction; and the protruding portion at least partially extends to the recessed portion along a second direction perpendicular to the first direction.

5. The adjustment assembly of the belt transmission device according to claim 4, characterized in that: The protrusion is columnar and provided with threads, the recess is a hole, the protrusion is passed through the recess, the protrusion is provided with a fastening nut, the fastening nut is sleeved on the protrusion and threadedly connected with the protrusion, and the fastening nut is suitable for abutting against the mounting component or the fixing component.

6. The adjustment assembly of the belt transmission device according to claim 5, characterized in that: The fixing member includes a first connecting plate, which is parallel to the first direction; the mounting member includes a second connecting plate, which is arranged parallel to the first connecting plate; the protrusion is arranged on one of the first connecting plate and the second connecting plate, and the recessed portion is arranged on the other of the first connecting plate and the second connecting plate.

7. The adjustment assembly of the belt transmission device according to claim 6, characterized in that: The protrusion is arranged on the first connecting plate, the recess is arranged on the second connecting plate, and the fastening nut is suitable for abutting against a side of the second connecting plate away from the first connecting plate.

8. The adjustment assembly of the belt transmission device according to claim 6, characterized in that: The protrusion is arranged on the second connecting plate, the recess is arranged on the first connecting plate, and the fastening nut is suitable for abutting against a side of the first connecting plate away from the second connecting plate.

9. A belt transmission device, characterized in that: include: Drive components; a driving wheel connected to the driving element; a driven wheel, the driven wheel being spaced apart from the driving wheel along a first direction; A transmission belt, wherein a first end of the transmission belt is sleeved on the driving wheel, and a second end of the transmission belt is sleeved on the driven wheel; as well as According to the adjustment assembly of the belt transmission device according to any one of claims 1 to 8, the mounting member is connected to the driven wheel.

10. A platform door, characterized in that: include: track; a movable door movably connected to the track along a first direction; as well as According to the belt drive device of claim 9, the drive belt is fixedly connected to the movable door.

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