CN215247840U - Steering device and air carrying system - Google Patents

Abstract

The utility model relates to a conveyer technical field discloses a turn to device and aerial handling system, include: the bracket is arranged on the base, and one end of the bracket is higher than the other corresponding end along the width direction of the bracket; the rotating shaft is arranged on the lower surface of the bracket; the pivot with the tie point of support for the equal eccentric settings in support lower surface length direction's center and width direction's center, just the tie point is close to the relatively higher one end of support, through structural design, the purpose that stably turns to when can realizing the article transport guarantees transportation safety.

Description

Steering device and air carrying system

Technical Field

The utility model relates to a conveyer field especially relates to a turn to device and aerial handling system.

Background

When the production line carries out material transportation, common mode of transportation includes ground transportation and aerial transportation two kinds of modes:

when ground transportation is adopted, the material transportation is usually realized on the ground by adopting a trolley, the corresponding material is transported to the side of a production line by the trolley, the time consumption is long in a ground transportation mode, the risk of mutual collision between the trolley and workers exists, and potential safety hazards exist;

when adopting aerial transportation, when article turn to need to carry out, often aim at designing in the transportation track, the material turns to based on inertia in the motion process and the track is mutually supported, on this basis, when turning to, has because the rate of movement is too fast, and the condition that appears and transportation track breaks away from has the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

To the problem of the security that exists when prior art transports in the air, the utility model aims to provide a turn to device and air handling system, through structural design, stably turn to the purpose when can realizing article transport, guarantee transportation safety.

The embodiment of the utility model provides a realize through following technical scheme:

first aspect

An embodiment of the utility model provides a turn to device, include: the bracket is arranged on the base, and one end of the bracket is higher than the other corresponding end along the width direction of the bracket; the rotating shaft is arranged on the lower surface of the bracket; the connecting point of the rotating shaft and the support is eccentrically arranged relative to the center of the length direction and the center of the width direction of the lower surface of the support, and the connecting point is close to the relatively higher end of the support.

In the scheme, the upper surface of the bracket is used for bearing materials to be transported, the length direction of the bracket is the incoming material and the discharging direction of the materials to be transported, when the steering device is used for transporting the materials, the materials to be transported are transported to the steering device, the bracket is obliquely arranged, the gravity of the materials to be transported is subjected to stress decomposition, the gravity of the materials to be transported can be decomposed into a component force which is parallel to the oblique direction of the bracket and a component force which is perpendicular to the oblique direction of the bracket, the rotating shaft is eccentrically arranged relative to the center of the length direction and the center of the width direction of the bracket, the connecting line of the gravity center of the object to be transported and the rotating shaft forms a force arm, the gravity drives the bracket to rotate along the component force which is parallel to the oblique direction of the bracket, and therefore the steering device can automatically steer based on the gravity of the object to be transported, through the steering device, in the process that the material to be transported moves to the steering device, the length and the direction of the connecting line of the gravity center of the material to be transported and the rotating shaft gradually change, and the part of the material to be transported on the support also gradually changes, so that the steering speed of the material to be transported is reduced, and the safety is further ensured.

Furthermore, the two ends of the support along the length direction are respectively a discharging end and a feeding end, and the connecting point is close to the feeding end.

Further, the range of the inclination angle a formed by the bracket and the horizontal plane is as follows: a is more than 1 degree and less than 45 degrees, and the inclination angle of the bracket is set, so that the steering device can realize steering based on the gravity of the material to be transported, and the phenomenon that the material is separated from the bracket due to the passage of the inclination angle is avoided.

Further, still including being used for realizing turning to the device and rotating the first balancing weight that resets, through setting up first balancing weight, turn to the device and accomplish to turn to the back based on the effect of waiting to transport material gravity, turn to the device and can return to the throne under the effect of gravity of first balancing weight, conveniently turn to the device and realize turning to of next waiting to transport material.

Second aspect of the invention

An embodiment of the utility model provides an aerial handling system is still provided, turn to the device, be used for to including the aforesaid the feed mechanism of aerial handling system material loading and be used for with the feeding agencies of aerial handling system material decline, turn to the device with feed mechanism and feeding agencies passes through the slope slide and connects.

When the air handling system that this scheme of use relates to carries out article transport, through carrying out the material loading in feed mechanism one end, feed mechanism through the slope slide with extracting mechanism connects, when needing to turn to in involving article handling, through turn to the device and connect both ends slope slide, be connected the slope slide that corresponds again with extracting mechanism, realize the control transportation of article, through air handling system, when carrying out article transportation, article utilize based on self gravity turn to the device and turn to, article and turn to the device and constitute a whole and turn to simultaneously, guaranteed the stability of article, avoid article to break away from the transportation track, cause harm.

As a specific embodiment of the feeding mechanism, the feeding mechanism comprises a counterweight well and a feeding well; the counterweight well is provided with a second counterweight block and a counterweight bearing disc which can be used for bearing the second counterweight block, and the counterweight bearing disc can move along the vertical direction; the feeding well is provided with a feeding bearing plate capable of moving along the vertical direction; the loading bearing plate is connected with the counterweight bearing plate through a first pulley block; the end, far away from the ground, of the feeding well is connected with the slope slide way, and when the feeding bearing disc rises to the corresponding position of the feeding well, the feeding bearing disc is communicated with the slope slide way to realize feeding. Through the structural design of feed mechanism, based on balancing weight and first assembly pulley, realize the automatic feeding of material, need not to adopt the mode that the manpower promoted, practice thrift the human cost.

Furthermore, the counterweight well is also provided with a counterweight holding piece which inclines relative to the ground, the second counterweight block is connected with the counterweight holding piece in a sliding manner, the counterweight bearing plate is arranged on one side, close to the ground, of the counterweight holding piece, and the counterweight block can be pertinently slid onto the counterweight bearing block by arranging the counterweight holding piece, so that the loading of articles is realized.

Further, the slope slide is the multistage, feed mechanism still includes first returning empty well, first returning empty well is provided with the first dish that bears that can follow vertical direction motion, the one end and another section that first returning empty well kept away from ground first returning empty well the slope slide is connected first bearing the dish and rising to during the first returning empty well corresponds the position, first bearing the dish with slope slide intercommunication realizes the unloading, through setting up first returning empty well article exist and need get back from the corresponding position of taking agencies during the corresponding position of feed mechanism, can follow first returning empty well and go out the returning charge that realizes article.

As a specific implementation manner of the material taking mechanism, the material taking mechanism comprises a second emptying well; the second returning empty well is provided with a second bearing disc capable of moving along the direction and a driving piece for driving the second bearing disc to move, the driving piece is connected with the second bearing disc through a second pulley block, and when the article needs to return to the corresponding position of the feeding mechanism from the corresponding position of the taking mechanism, the article can rise to the ramp slideway from the taking position through the second returning empty well, and the material to be returned is returned.

Furthermore, the driving piece comprises a driving piece body, and two ends of the driving piece body are respectively a force application end and a counterweight end; a hinge point is arranged between the two ends of the driving part body, and the driving part body can rotate around the hinge point; the distance from the force application end to the hinge point is greater than the distance from the counterweight end to the hinge point; the second pulley block is connected with the force application end, a driving piece is designed based on a lever principle, and the second bearing plate can ascend, return materials and descend and return under the action of the driving piece.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to a turn to device and aerial handling system, through structural design, the purpose that stably turns to when can realizing article transport guarantees transportation safety.

2. The utility model relates to a steering device and aerial handling system, through setting up the first balancing weight, after the steering device accomplished the direction based on the effect of the material gravity of waiting to transport, the steering device can be reset under the effect of gravity of the first balancing weight, make things convenient for the steering device to realize the next material of waiting to transport turns to;

3. the utility model relates to a steering device and an air handling system, which realizes the automatic feeding of materials based on a balancing weight and a first pulley block through the structural design of a feeding mechanism, does not need to adopt a manual lifting mode, and saves the labor cost;

4. the utility model relates to a turn to device and aerial handling system, through the structural design of driving piece designs the driving piece based on lever principle, the second bearing dish can rise returning charge and decline playback under the effect of driving piece.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of a steering device according to an embodiment of the present invention;

FIG. 2 is a front view of a steering device according to an embodiment of the present invention;

FIG. 3 is a bottom view of the steering device according to the embodiment of the present invention;

FIG. 4 is a top view of an aerial delivery system according to an embodiment of the present invention;

FIG. 5 is an elevation view of another embodiment of the present invention aerial delivery system;

fig. 6 is a schematic structural view of a driving member according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

100-steering device, 110-bracket, 120-rotating shaft, 130-first balancing weight, 200-feeding mechanism, 210-balancing well, 211-second balancing weight, 212-balancing weight bearing disc, 213-balancing weight retainer, 220-feeding well, 221-feeding bearing disc, 230-first returning empty well, 231-first bearing disc, 300-material taking mechanism, 310-second returning empty well, 311-second bearing disc, 312-driving piece, 312 a-force application end, 312 b-balancing weight end, 312 c-hinge point and 400-gradient slideway.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.

Examples

As shown in fig. 1-3, an embodiment of the present invention provides a steering device 100, including: a bracket 110, one end of the bracket 110 being higher than the corresponding other end in a width direction of the bracket 110; a rotating shaft 120 disposed on a lower surface of the bracket 110; the connection point of the rotating shaft 120 and the bracket 110 is eccentrically arranged with respect to the center of the length direction and the center of the width direction of the lower surface of the bracket 110, and the connection point is close to the relatively higher end of the bracket 110.

The upper surface of the support 110 is used for bearing materials to be transported, specifically, the upper surface of the support 110 is further provided with a roller, so that the materials to be transported can move on the upper surface of the support 110 conveniently, the rotation direction of the roller is along the length of the support 110 conveniently, and the materials to be transported can be transported along the length of the support 110.

Further, the support 110 is provided with railings along the two sides of the width direction, and the railings are used for preventing the material to be transported from being separated from the steering device 100 along the side direction when the weight of the material to be transported is too large and is larger than the friction force provided by the upper surface of the support 110.

In this embodiment, the upper surface of the bracket 110 is used for bearing a material to be transported, the longitudinal direction of the bracket 110 is the incoming material and the discharging direction of the material to be transported, when the material is transported by using the steering device 100, the material to be transported is transported to the steering device 100, because the bracket 110 is obliquely arranged, the gravity of the material to be transported is subjected to force decomposition, the gravity of the material to be transported can be decomposed into a component force which is parallel to the oblique direction of the bracket 110 and a component force which is perpendicular to the oblique direction of the bracket 110, and because the rotating shaft 120 is eccentrically arranged relative to the center of the bracket 110 in the longitudinal direction and the center of the rotating shaft 120 in the width direction, the connecting line of the gravity center of the object to be transported and the rotating shaft 120 forms a force arm, and the gravity drives the bracket 110 to rotate along the component force which is parallel to the oblique direction of the bracket 110, therefore, the steering device 100 automatically steers based on the gravity of the object to be transported, and through the steering device 100, in the process that the material to be transported moves to the steering device 100, the length and the direction of the connecting line of the gravity center of the material to be transported and the rotating shaft 120 gradually change, and the part of the material to be transported on the bracket 110 also gradually changes, so that the steering speed of the material to be transported is reduced, and the safety is further ensured.

As specific connection positions between the connection points and the support 110, two ends of the support 110 in the length direction are respectively a discharge end and a feeding end, in some embodiments, the connection points are close to the feeding end, the connection position of the rotating shaft 120 and the support 110 is close to the feeding end, when the steering device 100 is used for steering, the discharge end of the support 110 is driven to rotate along the rotating shaft 120 based on the gravity of the material to be transported, so that steering is realized, and the connection points are arranged close to the feeding end, so that the continuity of the material to be transported in the steering process is ensured, the speed loss of the material to be transported in the transportation process is reduced, and the transportation efficiency is ensured; in other embodiments, the connection point is close to the discharge end, the connection position between the rotating shaft 120 and the bracket 110 is close to the discharge end, when the steering device 100 is used for steering, the incoming end of the bracket 110 is driven to rotate along the rotating shaft 120 based on the gravity of the material to be transported, steering is achieved, the connection point is close to the discharge end, the speed of the material to be transported is reduced, and the safety of material transportation is ensured.

As shown in fig. 2, in some embodiments, the inclination angle a formed by the bracket 110 and the horizontal plane is in the range of: 1 < a < 45 DEG, and by setting the inclination angle of the bracket 110, the steering device 100 can realize steering based on the gravity of the material to be transported, and simultaneously, the material is prevented from being separated from the bracket 110 due to the passage of the inclination angle.

As shown in fig. 1, in some embodiments, the steering device 100 further includes a first weight block 130 for resetting after the steering device 100 rotates, and by providing the first weight block 130, after the steering device 100 completes steering based on the gravity of the material to be transported, the steering device 100 can reset under the gravity of the first weight block 130, which facilitates the steering device 100 to steer the next material to be transported.

Specifically, the connection position of the first counterweight 130 is close to a side far away from the rotating shaft 120 along the length direction of the bracket 110; along the width direction of the bracket 110, the connecting position is close to one side close to the rotating shaft 120, and through the design of the connecting position, the bracket 110 can be ensured to return under the gravity action of the first balancing weight 130.

As shown in fig. 4, the embodiment of the present invention further provides an air handling system, which includes the above-mentioned steering device 100, a feeding mechanism 200 for feeding to the air handling system, and a material taking mechanism 300 for lowering the material of the air handling system, wherein the steering device 100 is connected to the feeding mechanism 200 and the material taking mechanism 300 through a slope slideway.

When the air handling system that this scheme of use relates to carries out article transport, through carrying out the material loading in feed mechanism 200 one end, feed mechanism 200 through the slope slide with extracting mechanism 300 is connected, when needing to turn to in the article handling involving, through turn to device 100 and connect both ends slope slide, be connected the slope slide that corresponds again with extracting mechanism 300, realize the control transportation of article, through air handling system, when carrying out article transportation, article utilize based on self gravity turn to device 100 turns to, article and turn to device 100 and constitute a whole and turn to simultaneously, guaranteed the stability of article, avoid article to break away from the transportation track, cause harm.

As shown in fig. 5, as a specific embodiment of the feeding mechanism 200, the feeding mechanism 200 includes a counterweight well 210, a feeding well 220; the counterweight well 210 is provided with a second counterweight 211 and a counterweight bearing disc 212 capable of bearing the second counterweight 211, wherein the counterweight bearing disc 212 can move along the vertical direction; the feeding well 220 is provided with a feeding bearing disc 221 capable of moving along the vertical direction; the loading bearing disc 221 is connected with the counterweight bearing disc 212 through a first pulley block; one end, far away from the ground, of the feeding well 220 is connected with the slope slide way, when the feeding bearing disc 221 ascends to the corresponding position of the feeding well 220, the feeding bearing disc 221 is communicated with the slope slide way, and feeding is achieved. Through the structural design of feed mechanism 200, based on balancing weight and first assembly pulley, realize the automatic feeding of material, need not to adopt the mode that the manpower promoted, practice thrift the human cost.

When the feeding mechanism 200 is used for feeding, a material to be transported is placed in the feeding bearing tray 221, the second balancing weight 211 is placed in the balancing weight bearing tray 212, the balancing weight bearing tray 212 can move downwards in the balancing weight well 210 under the action of the gravity of the second balancing weight 211, the balancing weight bearing tray 212 is connected with the feeding bearing tray 221 through the first pulley block, the movement direction is changed through the first pulley block, when the balancing weight bearing tray 212 moves downwards under the action of the gravity of the second balancing weight 211, the feeding bearing tray 221 can move upwards under the traction action of the first pulley block, and the material to be transported is transported from the ground to the air.

In some embodiments, the counterweight well 210 is further provided with a counterweight holding member 213 inclined relative to the ground, the second counterweight 211 is slidably connected with the counterweight holding member 213, the counterweight bearing plate 212 is arranged on the side of the counterweight holding member close to the ground, and by providing the counterweight holding member 213, the counterweight can be purposefully slid onto the counterweight bearing block, so as to realize the loading of the article.

Specifically, the first balancing weight 130 is slidably connected to the weight holder 213, and after the first balancing weight 130 is unlocked relative to the weight holder 213, the first balancing weight 130 can slide along the inclined direction of the weight holder under the action of its own gravity due to the inclination of the weight holder 213, so that the first balancing weight 130 is transmitted to the weight bearing plate 212, and the feeding bearing plate 221 is driven.

Specifically, the counter weight bears the dish 212 below still to be provided with the swash plate the counter weight bears the dish 212 and is in the action of gravity of first balancing weight 130 moves down to when the swash plate, first balancing weight 130 can be under the action of gravity of self, along the incline direction transportation of swash plate extremely transmit to counter weight keeps dish below, makes things convenient for first balancing weight 130 with counter weight keeper 213 is mutually supported.

Wherein, the first balancing weight 130 is matched with the weight holders 213, and the first balancing weight 130 can be lifted by a traction trolley, so that the first balancing weight 130 is matched with the weight holders 213.

In some embodiments, the slope slideway is a plurality of segments, the feeding mechanism 200 further includes a first empty returning well 230, the first empty returning well 230 is provided with a first bearing plate 231 capable of moving along a vertical direction, one end of the first empty returning well 230, which is far away from the ground, is connected with another segment of the slope slideway, when the first bearing plate 231 rises to a position corresponding to the first empty returning well 230, the first bearing plate 231 is communicated with the slope slideway to realize blanking, and by providing the first empty returning well 230, when an article exists and needs to return to a corresponding position of the feeding mechanism 200 from a corresponding position of the taking mechanism 300, the article can be returned from the first empty returning well 230.

Specifically, the first loading well 220 further comprises a third bearing tray arranged at an interval with the loading bearing tray 221, the third bearing tray is arranged in an inclined manner, when the first bearing tray 231 moves downwards to a certain position, the first bearing tray 231 is communicated with the third bearing tray, and the material to be returned to the empty can be transferred to the third bearing tray through the first bearing tray 231, so that the material to be returned to the first loading well 220 is transferred from the first return empty well 230, and the material loading from the same side and the material taking from the empty material to be returned can be realized.

It should be noted that, in order to ensure that the materials on the first loading well 220 and the first emptying well 230 can smoothly slide to the ramp track and from the first carrying tray 231 to the third carrying tray, the first carrying tray 231, the third carrying tray, and the loading carrying tray 221 should be arranged obliquely with respect to the ground.

As shown in fig. 5, as a specific embodiment of the material taking mechanism 300, the material taking mechanism 300 includes a second returning empty well 310; the second empty returning well 310 is provided with a second bearing plate 311 capable of moving along the direction shown and a driving part 312 for driving the second bearing plate 311 to move, the driving part 312 is connected with the second bearing plate 311 through a second pulley block, and by arranging the second empty returning well 310, when the article needs to return to the corresponding position of the feeding mechanism 200 from the corresponding position of the taking mechanism 300, the material to be returned can be lifted to the ramp slideway from the taking position through the second empty returning well 310, and the material returning of the material to be returned is realized.

As shown in fig. 6, in some embodiments, the driving element 312 includes a driving element 312 body, and the two ends of the driving element 312 body are a force application end 312a and a weight distribution end 312 b; a hinge point 312c is arranged between the two ends of the driving member 312 body, and the driving member 312 body can rotate around the hinge point 312 c; the distance from the force application end 312a to the hinge point 312c is greater than the distance from the weight end 312b to the hinge point 312 c; the second pulley block is connected with the force application end 312a, the driving element 312 is designed based on the lever principle, and the second bearing plate can ascend, return and descend under the action of the driving element 312.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A steering device, characterized by comprising:

the bracket (110), along the width direction of the bracket (110), one end of the bracket (110) is higher than the other corresponding end;

the rotating shaft (120) is arranged on the lower surface of the bracket (110);

the connecting point of the rotating shaft (120) and the support (110) is eccentrically arranged relative to the center of the length direction and the center of the width direction of the lower surface of the support (110), and the connecting point is close to the relatively higher end of the support.

2. A steering arrangement according to claim 1, wherein the bracket (110) has a discharge end and a feed end at respective ends along the length thereof, the connection point being located adjacent the feed end.

3. Steering device according to claim 1, wherein the angle of inclination a of the bracket (110) with respect to the horizontal is in the range: a is more than 1 degree and less than 45 degrees.

4. A steering device according to claim 1, further comprising a first counterweight (130) for effecting a return after rotation of said steering device.

5. An aerial conveyance system comprising a diverter device (100) as claimed in any one of claims 1 to 4, a feed mechanism (200) for feeding the aerial conveyance system, and a take off mechanism (300) for lowering the aerial conveyance system material, the diverter device being connected to the feed mechanism and the take off mechanism by a ramp (400).

6. An aerial handling system as claimed in claim 5, wherein the loading mechanism (200) comprises a weigh well (210), a loading well (220);

the counterweight well (210) is provided with a second counterweight block (211) and a counterweight bearing disc (212) which can be used for bearing the second counterweight block (211), and the counterweight bearing disc can move along the vertical direction;

the feeding well (220) is provided with a feeding bearing disc (221) capable of moving along the vertical direction; the loading bearing plate (221) is connected with the counterweight bearing plate (212) through a first pulley block; one end, far away from the ground, of the feeding well (220) is connected with the slope slide way (400), and when the feeding bearing disc (221) rises to the corresponding position of the feeding well (220), the feeding bearing disc (221) is communicated with the slope slide way (400) to realize feeding.

7. An aerial handling system as claimed in claim 6, wherein the counterweight well is further provided with a counterweight holder (213) inclined with respect to the ground, the second counterweight (211) being slidably connected to the counterweight holder (213), the counterweight carrying tray (212) being provided on the side of the counterweight holder (213) close to the ground.

8. The aerial handling system of claim 5 or 6, wherein the slope slideway (400) is multi-segment, the feeding mechanism further comprises a first emptying returning well (230), the first emptying returning well (230) is provided with a first bearing tray (231) capable of moving in a vertical direction, one end of the first emptying returning well (230) far away from the ground is connected with the other segment of the slope slideway (400), and when the first bearing tray (231) rises to a position corresponding to the first emptying returning well (230), the first bearing tray (231) is communicated with the slope slideway (400) to realize blanking.

9. An aerial handling system as claimed in claim 5, wherein the material take off mechanism (300) comprises a second return empty well (310); the second emptying well (310) is provided with a second bearing disc (311) capable of moving along the direction and a driving piece (312) used for driving the second bearing disc (311) to move, and the driving piece (312) is connected with the second bearing disc (311) through a second pulley block.

10. An aerial handling system as claimed in claim 9, wherein the drive member (312) comprises a drive member body having a force application end (312a) and a weight application end (312b) at each end; a hinge point (312c) is arranged between the two ends of the driving piece body, and the driving piece body can rotate around the hinge point (312 c); the distance from the force application end (312a) to the hinge point (312c) is greater than the distance from the counterweight end (312b) to the hinge point (312 c); the second pulley block is connected (312a) with the force application end.

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