Integrated bidirectional lifting device

Abstract

The utility model discloses an integrated bidirectional lifting device which comprises a transmission shaft assembly, a driving assembly and a wheel belt transmission mechanism, the transmission shaft assembly comprises an upper transmission shaft and a lower transmission shaft, and the driving assembly comprises a first driving device and a second driving device; the wheel belt transmission mechanism comprises a first wheel belt transmission assembly and a second wheel belt transmission assembly. The first wheel belt transmission assembly comprises a first driving wheel fixedly arranged on the upper transmission shaft in a sleeving mode, a first driven wheel rotationally arranged on the lower transmission shaft in a sleeving mode and a first transmission strip wound on the first driving wheel and the first driven wheel. The second wheel belt transmission assembly comprises a second driving wheel fixedly arranged on the lower transmission shaft in a sleeving mode, a second driven wheel rotationally arranged on the upper transmission shaft in a sleeving mode and a second transmission strip wound on the second driving wheel and the second driven wheel. Therefore, the first wheel belt transmission assembly and the second wheel belt transmission assembly can achieve bidirectional lifting movement, only one transmission shaft assembly needs to be arranged, and the occupied space is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery, and in particular to an integrated bidirectional lifting device. Background Technology

[0002] Packaging machines are machines that package products, serving to protect and enhance their appearance. Existing packaging machines typically include a bidirectional lifting device (bidirectional, meaning both forward and backward movement) to lift the packaging bags. This bidirectional lifting device usually requires two independent drive shaft assemblies (each drive shaft assembly includes a drive shaft and a driven shaft) for lifting and lowering, making it impossible to integrate. This not only occupies a significant amount of space but also increases the number of overall structural components, thus raising costs.

[0003] Therefore, how to design an integrated bidirectional lifting device to reduce space occupation and lower costs is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides an integrated bidirectional lifting device that can achieve bidirectional lifting drive by setting only one set of transmission shaft assembly, thereby greatly reducing the space occupied, simplifying the structure, reducing the number of parts, and lowering the cost.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] An integrated bidirectional lifting device includes:

[0007] The fixed base includes a left support and a right support arranged at intervals on the left and right sides;

[0008] A drive shaft assembly includes an upper drive shaft and a lower drive shaft arranged at an interval; the upper drive shaft and the lower drive shaft are respectively mounted on the left support and the right support.

[0009] The drive assembly includes a first drive device and a second drive device arranged vertically at intervals; the first drive device is used to drive the upper drive shaft to rotate, and the second drive device is used to drive the lower drive shaft to rotate.

[0010] A belt drive mechanism includes a first belt drive assembly and a second belt drive assembly. The first belt drive assembly includes a first driving pulley fixedly sleeved on the upper drive shaft, a first driven pulley rotatably sleeved on the lower drive shaft, and a first drive bar respectively wound around the first driving pulley and the first driven pulley. The second belt drive assembly includes a second driving pulley fixedly sleeved on the lower drive shaft, a second driven pulley rotatably sleeved on the upper drive shaft, and a second drive bar respectively wound around the second driving pulley and the second driven pulley. The first drive bar and the second drive bar are respectively used to connect to a first external component and a second external component.

[0011] Specifically, when the first driving device drives the upper transmission shaft to rotate, it can drive the first driving wheel to rotate, and through the transmission of the first transmission bar, drive the first driven wheel to rotate relative to the lower transmission shaft, thereby realizing the rotation of the first transmission bar to drive the first external component to perform lifting and lowering movements; when the second driving device drives the lower transmission shaft to rotate, it can drive the second driving wheel to rotate, and through the transmission of the second transmission bar, drive the second driven wheel to rotate relative to the upper transmission shaft, thereby realizing the rotation of the second transmission bar to drive the second external component to perform lifting and lowering movements.

[0012] Furthermore, both the first and second belt drive assemblies are provided in two sets, and are respectively located at the left and right ends of the drive shaft assembly.

[0013] Furthermore, it also includes a hanger assembly, wherein:

[0014] The hanging arm assembly includes two front hanging arms and two rear hanging arms arranged at intervals.

[0015] The two front suspension arms are arranged at a distance from each other and are respectively fixed on the first transmission bar of the two first wheel belt drive assemblies. The two front suspension arms are used to connect with the first external component.

[0016] The two rear suspension arms are arranged at a distance from each other and are respectively fixed on the second transmission bar of the two second wheel belt drive assemblies. The two rear suspension arms are used to connect with the second external component.

[0017] Furthermore, it also includes a guide rail assembly, wherein:

[0018] The guide rail assembly includes a left guide rail disposed in the left support and a right guide rail disposed in the right support. A front hanger arm located on the left side and a rear hanger arm located on the left side are both slidably mounted on the left guide rail, and another front hanger arm located on the right side and another rear hanger arm located on the right side are both slidably mounted on the right guide rail.

[0019] Furthermore, both the front hanger on the left and the rear hanger on the left are provided with a left slider for sliding on the left guide rail; both the other front hanger on the right and the other rear hanger on the right are provided with a right slider for sliding on the right guide rail.

[0020] Furthermore, it also includes a cover plate assembly, wherein:

[0021] The cover plate assembly includes a left cover plate and a right cover plate arranged at a distance from each other. The left cover plate is connected to the left support and the two enclose each other to form a left mounting cavity. The right cover plate is connected to the right support and the two enclose each other to form a right mounting cavity.

[0022] The first wheel belt drive assembly located on the left and the second wheel belt drive assembly located on the left are both located in the left mounting cavity; the other first wheel belt drive assembly located on the right and the other second wheel belt drive assembly located on the right are both located in the right mounting cavity.

[0023] Furthermore, it also includes a bearing housing assembly, wherein:

[0024] The bearing housing assembly includes a first bearing housing and a second bearing housing arranged vertically at intervals; one of the first driving device and the first bearing housing is fixed to the left support, and the other is fixed to the right support; one of the second driving device and the second bearing housing is fixed to the left support, and the other is fixed to the right support.

[0025] One end of the upper drive shaft is connected to the output end of the first drive device, and the other end is rotatably connected to the first bearing seat.

[0026] One end of the lower drive shaft is connected to the output end of the second drive device, and the other end is rotatably connected to the second bearing seat.

[0027] Furthermore, it also includes a protective shield assembly, wherein:

[0028] The protective cover assembly includes a left protective cover and a right protective cover arranged at a distance from each other. The left protective cover is connected to the left support and the interior of the two covers encloses a first sealed cavity. The right protective cover is connected to the right support and the interior of the two covers encloses a second sealed cavity.

[0029] One of the drive assembly and the bearing housing assembly is disposed in the first sealing cavity, and the other is disposed in the second sealing cavity.

[0030] Furthermore, both the first drive device and the second drive device are geared motors.

[0031] Furthermore, both the first and second belt drive assemblies are sprocket and chain drive assemblies, wherein:

[0032] Both the first drive wheel and the second drive wheel are fixed sprockets;

[0033] Both the first driven wheel and the second driven wheel are sprockets with bearings;

[0034] Both the first transmission bar and the second transmission bar are chains.

[0035] In summary, the integrated bidirectional lifting device provided by this utility model has the following technical effects:

[0036] (1) The integrated bidirectional lifting device of this utility model, when the first driving device drives the upper transmission shaft to rotate, the upper transmission shaft is the active shaft and the lower transmission shaft is the fixed shaft. Under the action of the first wheel belt transmission assembly, the front hanging arm can be driven to lift and lower. When the second driving device drives the lower transmission shaft to rotate, the lower transmission shaft is the active shaft and the upper transmission shaft is the fixed shaft. Under the action of the second wheel belt transmission assembly, the rear hanging arm can be driven to lift and lower. Thus, by using the integrated bidirectional lifting device of this application, the original requirement of two independent transmission shaft assemblies is changed to a shared transmission shaft assembly. The device can significantly reduce the space occupied by the device without mutual interference, and also reduce the number of parts and reduce the cost.

[0037] (2) The integrated bidirectional lifting device of this utility model sets the front hanging arm and the rear hanging arm on the first wheel belt drive assembly and the second wheel belt drive assembly respectively. The first wheel belt drive assembly and the second wheel belt drive assembly are each set in two sets and are respectively set at the left and right ends of the drive shaft assembly. With this setting, the load center of gravity of the front hanging arm and the rear hanging arm can be transferred to the left and right ends of the drive shaft assembly, so that the drive shaft is not easy to deform, thereby improving the service life of the drive shaft. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the integrated bidirectional lifting device of this utility model;

[0039] Figure 2 This is a schematic diagram of the integrated bidirectional lifting device of this utility model after the cover plate assembly and protective cover assembly are hidden.

[0040] Figure 3 for Figure 2 A schematic diagram of the structure from a side view;

[0041] Figure 4 for Figure 3 A schematic diagram of the AA cross-section;

[0042] Figure 5 This is a partial cross-sectional schematic diagram of the integrated bidirectional lifting device of this utility model;

[0043] Figure 6 This is another cross-sectional schematic diagram of the integrated bidirectional lifting device of this utility model.

[0044] The meanings of the reference numerals in the attached figures are as follows:

[0045] 101. Left support; 102. Right support; 201. Upper drive shaft; 202. Lower drive shaft; 301. Left cover plate; 302. Right cover plate; 401. Left protective cover; 402. Right protective cover; 501. Front hanging arm; 502. Rear hanging arm; 601. First bearing seat; 602. Second bearing seat; 701. First drive unit; 702. Second drive unit; 801. First belt drive assembly; 8011. First driving wheel; 8012. First driven wheel; 8013. First transmission bar; 802. Second belt drive assembly; 8021. Second driving wheel; 8022. Second driven wheel; 8023. Second transmission bar; 901. Left guide rail; 902. Right guide rail. Detailed Implementation

[0046] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0047] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0049] See Figure 1-6This utility model discloses an integrated bidirectional lifting device, including a fixed base, a transmission shaft assembly mounted on the fixed base, a drive assembly mounted on the fixed base for driving the transmission shaft assembly, and a belt drive mechanism mounted on the transmission shaft assembly. Specifically, the fixed base includes a left support 101 and a right support 102 arranged at intervals; the transmission shaft assembly includes an upper transmission shaft 201 and a lower transmission shaft 202 arranged at intervals; the upper transmission shaft 201 and the lower transmission shaft 202 are respectively passed through the left support 101 and the right support 102; the drive assembly includes a first drive device 701 and a second drive device 702 fixed on the right support 102 and arranged at intervals, the first drive device 701 driving the upper transmission shaft 201 to rotate, and the second drive device 702 driving the lower transmission shaft 202 to rotate; the belt drive mechanism includes a first belt drive assembly 801 and a second belt drive assembly 802, the first belt drive assembly 801 including a first belt drive assembly 801 fixedly sleeved on the upper transmission shaft 201. The assembly includes a drive wheel 8011, a first driven wheel 8012 rotatably mounted on the lower drive shaft 202, and a first transmission bar 8013 wound around the first drive wheel 8011 and the first driven wheel 8012 respectively; the second wheel belt drive assembly 802 includes a second drive wheel 8021 fixedly mounted on the lower drive shaft 202, a second driven wheel 8022 rotatably mounted on the upper drive shaft 201, and a second transmission bar 8023 wound around the second drive wheel 8021 and the second driven wheel 8022 respectively; in addition, it also includes a front hanging arm 501 fixedly connected to the first transmission bar 8013 and a rear hanging arm 502 fixedly connected to the second transmission bar 8023, the front hanging arm 501 and the rear hanging arm 502 being connected to the first external component and the second external component respectively.

[0050] Therefore, when the first drive device 701 drives the upper transmission shaft 201 to rotate, it can drive the first drive wheel 8011 to rotate, and through the transmission of the first transmission bar 8013, drive the first driven wheel 8012 to rotate relative to the lower transmission shaft 202, thereby realizing the rotation of the first transmission bar 8013 to drive the front hanging arm 501 to perform lifting and lowering movements, thus realizing the lifting and lowering movements of the first external component; when the second drive device 702 drives the lower transmission shaft 202 to rotate, it can drive the second drive wheel 8021 to rotate, and through the transmission of the second transmission bar 8023, drive the second driven wheel 8022 to rotate relative to the upper transmission shaft 201, thereby realizing the rotation of the second transmission bar 8023 to drive the rear hanging arm 502 to perform lifting and lowering movements, thus realizing the lifting and lowering movements of the second external component.

[0051] Therefore, when the first drive device 701 drives the upper drive shaft 201 to rotate, the upper drive shaft 201 is the driving shaft, while the lower drive shaft 202 is the fixed shaft. Under the action of the first belt drive assembly 801, the front hanging arm 501 can be driven to move up and down. When the second drive device 702 drives the lower drive shaft 202 to rotate, the lower drive shaft 202 is the driving shaft, while the upper drive shaft 201 is the fixed shaft. Under the action of the second belt drive assembly 802, the rear hanging arm 502 can be driven to move up and down. Thus, by adopting the integrated bidirectional lifting device of this application, the original requirement of two independent drive shaft assemblies is reduced to a shared drive shaft assembly. This device can significantly reduce the space occupied by the device without mutual interference, and also reduces the number of parts and lowers the cost.

[0052] Furthermore, both the first belt drive assembly 801 and the second belt drive assembly 802 are provided in two sets, and are respectively located at the left and right ends of the drive shaft assembly. Similarly, both the front hanger arm 501 and the rear hanger arm 502 are provided in twos, and the two front hanger arms 501 are respectively fixed to the first drive bar 8013 of the two first belt drive assemblies 801, and the two front hanger arms 501 are used to connect with the first external component; the two rear hanger arms 502 are respectively fixed to the second drive bar 8023 of the two second belt drive assemblies 802, and the two rear hanger arms 502 are used to connect with the second external component.

[0053] This configuration transfers the center of gravity of the load on the front and rear hanging arms 501 to the left and right ends of the drive shaft assembly, making the drive shaft less prone to deformation and thus extending its service life. Furthermore, the inclusion of two sets of first-wheel belt drive assemblies 801 and two sets of second-wheel belt drive assemblies 802 makes the structure more balanced and stable, thereby improving the reliability of the lifting movement of the bidirectional lifting device.

[0054] See Figure 4-6 The integrated bidirectional lifting device also includes a guide rail assembly, which includes a left guide rail 901 disposed in the left support 101 and a right guide rail 902 disposed in the right support 102. A front hanging arm 501 and a rear hanging arm 502 located on the left side are both slidably mounted on the left guide rail 901, and another front hanging arm 501 and another rear hanging arm 502 located on the right side are both slidably mounted on the right guide rail 902. Preferably, the front hanging arm 501 and the rear hanging arm 502 located on the left side are each provided with a left slider for sliding on the left guide rail 901; and the other front hanging arm 501 and the other rear hanging arm 502 located on the right side are each provided with a right slider for sliding on the right guide rail 902.

[0055] Therefore, by setting up the guide rail assembly, the lifting and lowering movements of the front hanging arm 501 and the rear hanging arm 502 are made smoother and more stable, thereby improving the stability of the lifting and lowering movements of the first outer component and the second outer component.

[0056] See Figure 2 The integrated bidirectional lifting device also includes a bearing housing assembly, which includes a first bearing housing 601 and a second bearing housing 602 fixed on the left support 101 and arranged vertically at intervals. The first bearing housing 601 corresponds to the first drive device 701, and the second bearing housing 602 corresponds to the second drive device 702. One end of the upper drive shaft 201 is connected to the output end of the first drive device 701, and the other end is rotatably connected to the first bearing housing 601. One end of the lower drive shaft 202 is connected to the output end of the second drive device 702, and the other end is rotatably connected to the second bearing housing 602.

[0057] Of course, in other embodiments, the positions of the drive assembly and the bearing housing assembly can be interchanged, that is, the drive assembly can be placed on the left support 101 and the bearing housing assembly can be placed on the right support 102, which can achieve the same technical effect. There are no restrictions here.

[0058] See Figure 1-2 The integrated bidirectional lifting device also includes a cover plate assembly, which includes a left cover plate 301 and a right cover plate 302 arranged at intervals. The left cover plate 301 is connected to the left support 101 and the two enclose each other to form a left mounting cavity. The right cover plate 302 is connected to the right support 102 and the two enclose each other to form a right mounting cavity. A first wheel belt drive assembly 801, a second wheel belt drive assembly 802, and a left guide rail 901 located on the left side are all located in the left mounting cavity. Another first wheel belt drive assembly 801 and another second wheel belt drive assembly 802 located on the right side are both located in the right mounting cavity, thereby playing a role in preventing dust and pollution.

[0059] Furthermore, the integrated bidirectional lifting device also includes a protective cover assembly, which includes a left protective cover 401 and a right protective cover 402 arranged at intervals. The left protective cover 401 is connected to the left support 101 and the two enclose each other to form a first sealed cavity. The right protective cover 402 is connected to the right support 102 and the two enclose each other to form a second sealed cavity. The bearing housing assembly is disposed in the first sealed cavity, and the drive assembly is disposed in the second sealed cavity, thereby playing a role in preventing dust and pollution.

[0060] In this embodiment of the utility model, both the first driving device 701 and the second driving device 702 are geared motors.

[0061] In this embodiment of the utility model, the first belt drive assembly 801 and the second belt drive assembly 802 are both sprocket and chain drive assemblies, wherein the first driving wheel 8011 and the second driving wheel 8021 are both fixed sprockets; the first driven wheel 8012 and the second driven wheel 8022 are both sprockets with bearings; and the first transmission bar 8013 and the second transmission bar 8023 are both chains.

[0062] In summary, the integrated bidirectional lifting device provided by this utility model has the following technical effects:

[0063] (I) The integrated bidirectional lifting device of this utility model, when the first driving device 701 drives the upper transmission shaft 201 to rotate, the upper transmission shaft 201 is the active shaft and the lower transmission shaft 202 is the fixed shaft. Under the action of the first wheel belt transmission assembly 801, it can drive the front hanging arm 501 to move up and down; when the second driving device 702 drives the lower transmission shaft 202 to rotate, the lower transmission shaft 202 is the active shaft and the upper transmission shaft 201 is the fixed shaft. Under the action of the second wheel belt transmission assembly 802, it can drive the rear hanging arm 502 to move up and down; thus, by adopting the integrated bidirectional lifting device of this application, the original requirement of two independent transmission shaft assemblies is reduced to a shared transmission shaft assembly. The device can significantly reduce the space occupied by the device without mutual interference, and also reduce the number of parts and lower the cost.

[0064] (II) The integrated bidirectional lifting device of this utility model is configured by setting the front hanging arm 501 and the rear hanging arm 502 on the first wheel belt drive assembly 801 and the second wheel belt drive assembly 802 respectively. The first wheel belt drive assembly 801 and the second wheel belt drive assembly 802 are each provided with two sets and are respectively located at the left and right ends of the drive shaft assembly. With this configuration, the center of gravity of the load of the front hanging arm 501 and the rear hanging arm 502 can be transferred to the left and right ends of the drive shaft assembly, so that the drive shaft is not easily deformed, thereby improving the service life of the drive shaft.

[0065] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An integrated bidirectional lifting device, characterized in that, The utility model relates to a lifting device for external components, comprising: a fixed seat comprising a left support and a right support arranged at intervals; a transmission shaft assembly comprising an upper transmission shaft and a lower transmission shaft arranged at intervals; a drive assembly comprising a first drive device and a second drive device arranged at intervals; the first drive device is used to drive the upper transmission shaft to rotate, and the second drive device is used to drive the lower transmission shaft to rotate; a wheel belt transmission mechanism comprising a first wheel belt transmission assembly and a second wheel belt transmission assembly, the first wheel belt transmission assembly comprising a first driving wheel fixedly sleeved on the upper transmission shaft, a first driven wheel rotatably sleeved on the lower transmission shaft, and a first transmission strip wound on the first driving wheel and the first driven wheel respectively; the second wheel belt transmission assembly comprises a second driving wheel fixedly sleeved on the lower transmission shaft, a second driven wheel rotatably sleeved on the upper transmission shaft, and a second transmission strip wound on the second driving wheel and the second driven wheel respectively; the first transmission strip and the second transmission strip are used to connect with a first external component and a second external component respectively; when the first drive device drives the upper transmission shaft to rotate, the first driving wheel can be driven to rotate, and the first transmission strip is driven to rotate relative to the lower transmission shaft through the transmission of the first transmission strip, so that the rotation of the first transmission strip drives the first external component to move up and down; when the second drive device drives the lower transmission shaft to rotate, the second driving wheel can be driven to rotate, and the second transmission strip is driven to rotate relative to the upper transmission shaft through the transmission of the second transmission strip, so that the rotation of the second transmission strip drives the second external component to move up and down.

2. The integrated bidirectional lift device of claim 1, wherein: The first wheel belt transmission assembly and the second wheel belt transmission assembly are each provided with two groups and are arranged at the left and right ends of the transmission shaft assembly.

3. The integrated bidirectional lift device of claim 2, wherein: It also comprises a hanging arm assembly, wherein: the hanging arm assembly comprises two front hanging arms and two rear hanging arms arranged at intervals; the two front hanging arms are arranged at intervals and are fixed on the first transmission strips of the two first wheel belt transmission assemblies respectively, and are used to connect with a first external component; the two rear hanging arms are arranged at intervals and are fixed on the second transmission strips of the two second wheel belt transmission assemblies respectively, and are used to connect with a second external component.

4. The integrated bidirectional lift device of claim 3, wherein: It also comprises a guide rail assembly, wherein: the guide rail assembly comprises a left guide rail arranged in the left support and a right guide rail arranged in the right support, and the left front hanging arm and the left rear hanging arm are slidably arranged on the left guide rail, and the right front hanging arm and the right rear hanging arm are slidably arranged on the right guide rail.

5. The integrated bidirectional lift device of claim 4, wherein: the left front hanging arm and the left rear hanging arm are each provided with a left sliding block for sliding on the left guide rail, and the right front hanging arm and the right rear hanging arm are each provided with a right sliding block for sliding on the right guide rail.

6. The integrated bidirectional lift device of any one of claims 2-5, wherein: It also comprises a cover plate assembly, wherein: The cover plate assembly comprises left and right cover plates arranged at intervals, the left cover plate is connected with the left support and a left mounting cavity is formed between the two, and the right cover plate is connected with the right support and a right mounting cavity is formed between the two; The first and second belt drive assemblies on the left are located in the left mounting cavity, and the first and second belt drive assemblies on the right are located in the right mounting cavity.

7. The integrated bidirectional lift device of any one of claims 1-5, wherein: The bearing seat assembly comprises first and second bearing seats arranged at intervals, one of the first driving device and the first bearing seat is fixed on the left support, and the other is fixed on the right support, one of the second driving device and the second bearing seat is fixed on the left support, and the other is fixed on the right support; One end of the upper transmission shaft is connected with the output end of the first driving device, and the other end is rotatably connected with the first bearing seat; One end of the lower transmission shaft is connected with the output end of the second driving device, and the other end is rotatably connected with the second bearing seat. The protective cover assembly comprises left and right protective covers arranged at intervals, the left protective cover is connected with the left support and a first sealing cavity is formed between the two, and the right protective cover is connected with the right support and a second sealing cavity is formed between the two; 8. The integrated bidirectional lift device of claim 7, wherein: One of the driving assembly and the bearing seat assembly is arranged in the first sealing cavity, and the other is arranged in the second sealing cavity. The first driving device and the second driving device are both reduction motors. The first and second belt drive assemblies are both chain wheel and chain transmission assemblies, wherein:

9. The integrated bidirectional lift device of any one of claims 1-5, wherein: The first and second driving wheels are both fixed chain wheels; 10. The integrated bidirectional lift device of any one of claims 1-5, wherein: The first and second driven wheels are both bearing chain wheels; The first and second transmission bars are both chains. ​ ​

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