Foldable mobile casting plant dust hood

Abstract

The utility model provides a kind of collapsible mobile casting workshop dust hood, comprising: dust hood body, the dust collection pipeline being communicated with dust hood body upper portion, the rotating mechanism being cooperated with dust collection pipeline, the smoke dust treatment device being communicated with one end of dust collection pipeline, the smoke dust inlet being equipped in dust hood body bottom;Still comprising: the connecting bracket of several being fixed in the both sides wall of dust hood body, be equipped with screw nut mechanism outside connecting bracket, the parallelogram telescopic mechanism being connected with screw nut mechanism, the cable device being fixed in the front end of dust hood body, the folding cover being connected with cable device;Through above-mentioned scheme, through parallelogram telescopic mechanism and screw nut mechanism combination, the quick folding or unfolding function of dust hood body is realized, different sizes of casting station can be flexibly matched, solve the problem that traditional fixed dust hood is large in space occupation and operation area is limited, especially suitable for multi-species small batch flexible production mode.

Description

Technical Field

[0001] This utility model relates to the technical field of dust collection hoods for casting workshops, specifically to a foldable mobile dust collection hood for casting workshops. Background Technology

[0002] In the foundry industry, the casting process generates a large amount of fumes and harmful gases, which not only pollute the environment but also seriously threaten the health of operators. To address this issue, the commonly used method is to install dust collection hoods, which use exhaust systems to collect the fumes and transport them to fume treatment devices for purification. However, some existing dust collection hoods have shortcomings in practical applications. Traditional dust collection hoods are mostly fixed or bulky, making them difficult to move within the casting workshop. Furthermore, when not in use, they occupy significant production space, affecting workshop layout and production efficiency. Especially for foundry enterprises that require frequent adjustments to work areas or have high space utilization requirements, these fixed or bulky dust collection hoods cannot meet their flexible production needs. Utility Model Content

[0003] This utility model provides a foldable mobile dust collection hood for casting workshops to solve the problem that existing dust collection hoods cannot meet the needs of flexible production due to being fixed or bulky.

[0004] To address the aforementioned problems, this utility model provides a foldable mobile dust collection hood for casting workshops, comprising: a dust collection hood body, a dust collection pipe connected to the upper part of the dust collection hood body, a rotating mechanism cooperating with the dust collection pipe, a dust treatment device connected to one end of the dust collection pipe, and a dust inlet located at the bottom of the dust collection hood body; further comprising: several connecting brackets fixed to the side walls of the dust collection hood body, a screw and nut mechanism located on the outside of the connecting brackets, a parallelogram telescopic mechanism connected to the screw and nut mechanism, a cable device fixed to the front end of the dust collection hood body, and a folding cover connected to the cable device.

[0005] The above solution, through the combination of a parallelogram telescopic mechanism and a screw and nut mechanism, enables the dust collection hood to be quickly folded or unfolded. It can be flexibly matched with casting stations of different sizes, solving the problems of large space occupation and limited working area of ​​traditional fixed dust collection hoods. It is especially suitable for flexible production modes with multiple varieties and small batches. The integrated rotating mechanism enables the dust collection hood system to have rapid transfer capability, which can be switched between different casting lines according to the production plan, improving equipment utilization and reducing equipment downtime caused by process changes.

[0006] According to one embodiment of this utility model, the aforementioned parallelogram telescopic mechanism is composed of several first frames, which adopt an X-shaped stacking structure. Through this scheme, the X-shaped stacking structure provides good guidance and constraint for the telescopic movement of the first frames. Under the drive of the lead screw and nut mechanism, the first frames can smoothly telescopically move along a predetermined trajectory, reducing jamming and friction during the movement, making the unfolding and folding of the dust collection hood smooth and easy, and improving the convenience and efficiency of operation.

[0007] According to one embodiment of the present invention, a self-compensating clearance bearing is used between the first frames. Through the above scheme, during the unfolding and folding of the dust collection hood, relative movement will occur between the first frames. The self-compensating clearance bearing can automatically adjust the internal clearance of the bearing, effectively buffering and absorbing the vibration and impact force generated during the movement.

[0008] According to one embodiment of this utility model, the aforementioned lead screw and nut mechanism includes a fixed plate with a sliding groove fixed below the top side edge of the dust collection hood, a first motor fixed on the fixed plate, a lead screw connected to the output end of the first motor, a ball nut that rotates in cooperation with the lead screw, and a first frame fixedly connected to the ball nut via a bearing slider. Through the above scheme, since the lead screw and the ball nut rotate in cooperation, the rotational motion of the motor can be accurately converted into the linear motion of the ball nut. The first frame is fixedly connected to the ball nut via a bearing slider, so that the first frame can unfold or fold as the ball nut moves linearly, thereby realizing the control of the shape of the dust collection hood and meeting the requirements of the dust collection hood's coverage area and shape in different working scenarios.

[0009] According to one embodiment of the present invention, the end of the parallelogram telescopic mechanism is fixedly connected to the connecting bracket through a connecting plate with a groove. With the above solution, during the change of the shape of the dust collection hood, the parallelogram telescopic mechanism needs to perform telescopic movement, while the connecting bracket plays the role of fixing and supporting the dust collection hood. Through the connecting plate with the groove, the movement of the telescopic mechanism can be smoothly transmitted to the connecting bracket, reducing the jamming and impact during the movement, and making the unfolding and folding of the dust collection hood smoother and more coordinated.

[0010] According to one embodiment of this utility model, both the dust collection hood and the folding cover are made of high-silica fireproof cloth. Through the above solution, the high-silica fireproof cloth has excellent high-temperature resistance, can maintain structural stability in high-temperature environments, and is not easily combustible. In high-temperature work environments such as casting workshops, it can prevent the dust collection hood and folding cover from burning due to high temperature or accidental sparks, avoid fire accidents, and ensure safe production in the workshop. When the dust collection hood is not needed, it can be folded up to reduce space occupation and facilitate storage and transportation. When in use, it can be quickly unfolded and restored to its original shape, improving the convenience of operation.

[0011] According to one embodiment of the present invention, the connecting bracket is composed of several horizontal brackets and an X-shaped frame. The ends of the horizontal brackets are equipped with pulleys, and the side walls of the dust collection hood are equipped with slide rails for the pulleys to slide. Through the above scheme, the X-shaped frame has excellent anti-deformation ability and can distribute the force in multiple directions. It works in conjunction with the horizontal brackets to effectively enhance the overall rigidity of the connecting bracket. During the unfolding and folding of the dust collection hood, as well as when bearing external loads, it can remain stable and is not prone to deformation, thus ensuring the normal use of the dust collection hood.

[0012] According to one embodiment of this utility model, the aforementioned rotating mechanism includes: a third motor fixedly mounted on a support frame; a first pulley connected to the output shaft of the third motor; a second pulley that rotates with the first pulley via a belt and is located on the outside of the dust collection pipe; and a rolling bearing located on the inside of the second pulley and rotating in conjunction with it. The rolling bearing is located on the outside of the first dust collection pipe. Through the above scheme and the matching control system, the rotation angle and speed of the dust collection pipe can be accurately controlled according to actual production needs. When switching between different casting stations, the dust collection hood can be quickly and accurately adjusted to a suitable position, improving dust collection efficiency and meeting the requirements of flexible production.

[0013] According to one embodiment of the present invention, the folding cover adopts a four-section nested frame cover, and a rotating hinge mechanism is configured on both sides of the folding cover. Through the above scheme, the rotating hinge mechanism provides a flexible rotation method for unfolding and folding the folding cover. When the dust collection cover needs to be used, the workers can use the rotating hinge mechanism to unfold the four sections of the frame in sequence through simple operation, quickly forming a complete dust collection cover structure, saving preparation time. Similarly, after the casting operation is completed, the folding cover can also be quickly folded up, improving work efficiency.

[0014] According to one embodiment of this utility model, the above-mentioned cable device is equipped with a second motor. The output end of the second motor is connected to a rotating shaft, and a collar for connecting the suspension rope is fixed on the rotating shaft. The other end of the suspension rope is connected to the uppermost folding cover. Through the above scheme, the rotating shaft can be driven to rotate by the forward and reverse rotation of the motor, thereby realizing the raising and lowering of the suspension rope. This makes the raising and lowering process of the folding cover fully automated, without the need for manual operation, saving manpower and time costs, and improving the unfolding and storage efficiency of the dust collection cover. It is especially suitable for casting operation scenarios where the height of the dust collection cover needs to be adjusted frequently.

[0015] The technical advantages of this application are as follows: This application provides a foldable mobile dust collection hood for casting workshops. Through a combination of a parallelogram telescopic mechanism and a screw and nut mechanism, the dust collection hood can be quickly folded or unfolded, flexibly matching casting stations of different sizes. This solves the problems of large space occupation and limited working area of ​​traditional fixed dust collection hoods, and is especially suitable for flexible production modes with multiple varieties and small batches. The integrated rotating mechanism and modular dust treatment device enable the dust collection hood system to have rapid transfer capability, which can be switched between different casting lines according to the production plan, improving equipment utilization and reducing equipment downtime caused by process changes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a foldable mobile dust collection hood for a casting workshop provided by this utility model.

[0017] Figure 2 This is a rear-view structural diagram of a foldable mobile dust collection hood for a casting workshop provided by this utility model.

[0018] Figure 3 This utility model provides Figure 1 A magnified view of the details at point A in the middle.

[0019] Figure 4 This utility model provides Figure 2 A magnified view of the details at point B in the middle.

[0020] Figure 5 This is a cross-sectional view of the rotating mechanism of a foldable mobile dust collection hood for a casting workshop provided by this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Dust collection hood; 2. Dust collection duct; 3. Rotating mechanism; 4. Dust treatment device; 101. Lead screw and nut mechanism; 1011. First motor; 1012. Fixing plate; 1013. Lead screw; 1014. Ball nut; 102. Parallelogram telescopic mechanism; 1021. Self-compensating clearance bearing; 1022. First frame; 1023. Connecting plate; 103. Connecting bracket; 1031. Horizontal bracket; 1032. X-shaped frame; 1033. Slide rail; 1034. Pulley; 104. Folding cover; 1041. Frame cover; 1042. Rotary hinge mechanism; 105. Cable assembly; 1051. Second motor; 1052. Collar; 1053. Suspension rope; 1054. Shaft; 106. Smoke and dust inlet; 201. First dust collection pipe; 202. Second dust collection pipe; 301. Support frame; 302. Third motor; 303. First pulley; 304. Second pulley; 305. Rolling bearing. Detailed Implementation

[0022] The following will be combined with the appendix Figures 1-5 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples and should not be used to limit the scope of protection of this application.

[0023] Reference Figures 1-5 This utility model provides a foldable mobile dust collection hood for a casting workshop, comprising: a dust collection hood body 1, a dust collection pipe 2 connected to the upper part of the dust collection hood body 1, a rotating mechanism 3 cooperating with the dust collection pipe 2, and a dust treatment device 4 connected to one end of the dust collection pipe 2. In specific implementation, those skilled in the art can set the dust treatment device 4 in the dust treatment area of ​​the factory. Generally, the dust treatment device includes a cooling system and a dust removal system. The dust removal system also includes a cyclone separator, a bag filter, etc.; an open dust inlet 106 located at the bottom of the dust collection hood body 1; and further comprising: several connecting brackets 103 fixed to the two side walls of the dust collection hood body 1, a screw 1013 nut mechanism 101 located on the outside of the connecting brackets 103, a parallelogram telescopic mechanism 102 connected to the screw 1013 nut mechanism 101, a cable device 105 fixed to the front end of the dust collection hood body 1, and a folding cover 104 connected to the cable device 105. Through the above solution, the parallelogram telescopic mechanism 102 and the lead screw 1013 nut mechanism 101 are combined to realize the function of quick folding or unfolding of the dust collection hood 1. It can be flexibly matched with casting stations of different sizes, solving the problems of large space occupation and limited working area of ​​traditional fixed dust collection hoods. It is especially suitable for flexible production mode of multiple varieties and small batches. The integrated rotating mechanism 3 enables the dust collection hood system to have the ability to be quickly transferred. It can be switched between different casting lines according to the production plan, improving equipment utilization and reducing equipment idle time caused by process changes.

[0024] The folding cover 104 serves as an auxiliary dust collection device. During casting operations, it can be unfolded as needed to expand the dust collection range and more effectively capture dust generated in different locations. When not in use or when a larger operating space is required, it can be folded up to reduce obstruction to operations.

[0025] The aforementioned parallelogram telescopic mechanism 102 is composed of several first frames 1022, employing an X-shaped stacking structure. This X-shaped stacking structure provides excellent guidance and constraint for the telescopic movement of the first frames 1022. Driven by the lead screw 1013 and nut mechanism 101, the first frames 1022 can smoothly telescopically move along a predetermined trajectory, reducing jamming and friction during movement. This makes the unfolding and folding of the dust collection hood smooth and easy, improving operational convenience and efficiency.

[0026] The first frame 1022 is provided with a self-compensating clearance bearing 1021. With the above solution, during the unfolding and folding of the dust collection cover, the first frame 1022 will move relative to each other. The self-compensating clearance bearing 1021 can automatically adjust the internal clearance of the bearing to effectively buffer and absorb the vibration and impact generated during the movement.

[0027] The aforementioned lead screw 1013 nut mechanism 101 includes a fixed plate 1012 with a sliding groove fixed below the top side edge of the dust collection hood 1, a first motor 1011 fixed on the fixed plate 1012, a lead screw 1013 connected to the output end of the first motor 1011, a ball nut 1014 that rotates in cooperation with the lead screw 1013, and a first frame 1022 fixedly connected to the ball nut 1014 via a bearing slider. Through the above scheme, since the lead screw 1013 and the ball nut 1014 rotate in cooperation, the rotational motion of the motor can be accurately converted into the linear motion of the ball nut 1014. The first frame 1022 is fixedly connected to the ball nut 1014 via a bearing slider, so that the first frame 1022 can unfold or fold as the ball nut 1014 moves linearly, thereby realizing the control of the shape of the dust collection hood 1 and meeting the requirements of the dust collection hood coverage and shape in different working scenarios.

[0028] The end of the parallelogram telescopic mechanism 102 is fixedly connected to the connecting bracket 103 through a connecting plate 1023 with a sliding groove. With the above scheme, the parallelogram telescopic mechanism 102 needs to telescopically move during the change of the shape of the dust collection hood, while the connecting bracket 103 plays the role of fixing and supporting the dust collection hood body 1. Through the connecting plate 1023 with a sliding groove, the movement of the telescopic mechanism can be smoothly transmitted to the connecting bracket 103, reducing the jamming and impact during the movement, and making the unfolding and folding of the dust collection hood smoother and more coordinated.

[0029] Both the dust collection hood 1 and the folding cover 104 mentioned above are made of high-silica fireproof cloth. Through the above solution, the high-silica fireproof cloth has excellent high-temperature resistance and can maintain structural stability in high-temperature environments. It is not easy to burn. In high-temperature work environments such as casting workshops, it can prevent the dust collection hood 1 and the folding cover 104 from burning due to high temperature or accidental sparks, avoid fire accidents, and ensure safe production in the workshop. When the dust collection hood is not needed, it can be folded up to reduce space occupation and facilitate storage and transportation. When in use, it can be quickly unfolded and restored to its original shape, improving the convenience of operation.

[0030] The aforementioned connecting bracket 103 is composed of several horizontal brackets 1031 and an X-shaped frame 1032. A pulley 1034 is installed at the end of the horizontal bracket 1031, and a slide rail 1033 for sliding the pulley 1034 is installed on the side wall of the dust collection hood 1. Through the above scheme, the X-shaped frame 1032 has excellent anti-deformation ability and can distribute the force in multiple directions. It works in conjunction with the horizontal bracket 1031 to effectively enhance the overall rigidity of the connecting bracket 103. During the unfolding and folding of the dust collection hood, as well as when bearing external loads, it can remain stable and is not prone to deformation, ensuring the normal use of the dust collection hood.

[0031] The aforementioned rotating mechanism 3 includes: a third motor 302 fixedly mounted on the support frame 301; a first pulley 303 connected to the output shaft of the third motor 302; a second pulley 304 rotating with the first pulley 303 via a belt and located on the outside of the dust collection pipe 2; and a rolling bearing 305 rotating with the second pulley 304 on the inside of the second pulley 304. The rolling bearing 305 is located on the outside of the first dust collection pipe 201. Through the above scheme and the matching control system, the rotation angle and speed of the dust collection pipe 2 can be accurately controlled according to actual production needs. When switching between different casting stations, the dust collection hood can be quickly and accurately adjusted to a suitable position, improving dust collection efficiency and meeting the requirements of flexible production.

[0032] The aforementioned folding cover 104 adopts a four-section nested frame cover 1041, and the folding cover 104 is equipped with a rotating hinge mechanism 1042 on both sides. Through the above scheme, the rotating hinge mechanism 1042 provides a flexible rotation method for the unfolding and folding of the folding cover 104. When the dust collection cover needs to be used, the staff can use the rotating hinge mechanism 1042 to unfold the four sections of the frame in sequence through simple operation, quickly forming a complete dust collection cover structure, saving preparation time. Similarly, after the casting operation is completed, the folding cover 104 can also be quickly folded up, improving work efficiency.

[0033] The aforementioned cable device 105 is equipped with a second motor 1051. The output end of the second motor 1051 is connected to a rotating shaft 1054. A collar 1052 for connecting the suspension rope 1053 is fixed on the rotating shaft 1054. The other end of the suspension rope 1053 is connected to the uppermost folding cover 104. Through the above scheme, the collar 1052 can be rotated by the forward and reverse rotation of the motor, thereby realizing the raising and lowering of the suspension rope 1053. This allows the lifting and lowering process of the folding cover 104 to be fully automated without manual operation, saving manpower and time costs, and improving the unfolding and storage efficiency of the dust collection cover. It is especially suitable for casting operation scenarios where the height of the dust collection cover needs to be adjusted frequently.

[0034] Working principle: When dust collection is required during casting operations, the first motor 1011 is started, which drives the lead screw 1013 connected to its output end to rotate. Since the lead screw 1013 and the ball nut 1014 rotate in coordination, the rotational motion of the lead screw 1013 is converted into the linear motion of the ball nut 1014.

[0035] The parallelogram telescopic mechanism 102 adopts an X-shaped stacking structure, which provides good guidance and constraint for the telescopic movement of the first frame 1022. The first frame 1022 is connected by a self-compensating clearance bearing 1021. The first frame 1022 is fixedly connected to the ball nut 1014 through the bearing slider. As the ball nut 1014 moves linearly, the first frame 1022 moves smoothly along the trajectory. During the telescopic movement, the internal clearance can be automatically adjusted to effectively buffer and absorb vibration and impact, and reduce jamming and friction.

[0036] The end of the parallelogram telescopic mechanism 102 is fixedly connected to the connecting bracket 103 through a connecting plate 1023 with a sliding groove. The movement of the telescopic mechanism is smoothly transmitted to the connecting bracket 103 through the connecting plate 1023, so that the dust collection hood 1 can be unfolded or folded to meet the requirements of the dust collection hood coverage and shape in different working scenarios.

[0037] During the casting operation, the operator unfolds the four frame sections sequentially by rotating the hinge mechanism 1042, and starts the second motor 1051 in the cable device 105. The motor drives the rotating shaft 1054 connected to its output end to rotate by rotating forward and backward. The collar 1052 on the rotating shaft 1054 rotates accordingly, realizing the raising and lowering of the suspension rope 1053 fixed on the collar 1052. The other end of the suspension rope 1053 is connected to the uppermost folding cover 104, thereby realizing the automatic raising and lowering of the folding cover 104, quickly forming a complete dust collection cover structure, expanding the dust collection range, and more effectively capturing dust generated in different locations. When not in use or when a larger operating space is required, the folding cover 104 can be quickly folded up to reduce obstruction to the operation.

[0038] When different casting stations need to be prepared, the third motor 302 in the rotating mechanism 3 is activated, driving the first pulley 303 connected to its output shaft to rotate. The first pulley 303 drives the second pulley 304 located on the outside of the dust collection pipe 2 to rotate via a belt. The rolling bearing 305 rotating inside the second pulley 304 drives the first dust collection pipe 201 to rotate. The second dust collection pipe 202 does not contact the rolling bearing. The contact part between the first dust collection pipe 201 and the second dust collection pipe 202 is equipped with a sealing device to ensure the stability of rotation and the sealing of dust collection. By controlling the forward and reverse rotation of the motor and adjusting its rotation speed, the rotation angle and speed of the dust collection pipe 2 can be accurately controlled according to actual production needs. When switching between different casting stations, the dust collection hood can be quickly and accurately adjusted to a suitable position, improving dust collection efficiency and meeting the requirements of flexible production.

[0039] The bottom of the dust collection hood 1 is provided with an open dust inlet 106. The unfolded dust collection hood 1 and the folded cover 104 cover the casting station. The dust generated during the casting process enters the dust collection hood 1 through the open dust inlet 106, and then enters the dust treatment device 4 through the dust collection pipe 2 connected to the upper part of the dust collection hood 1, and then enters the dust treatment device 4 through the first dust collection pipe 201 and the second dust collection pipe 202 in sequence for treatment, so as to realize the collection and purification of dust in the workshop.

[0040] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A collapsible mobile casting plant dust hood comprising: The dust collection hood (1), the dust collection pipe (2) connected to the upper part of the dust collection hood (1), the rotating mechanism (3) cooperating with the dust collection pipe (2), the dust treatment device (4) connected to one end of the dust collection pipe (2), and the dust inlet (106) located at the bottom of the dust collection hood (1); characterized in that it further includes: a plurality of connecting brackets (103) fixed to the two side walls of the dust collection hood (1), a screw nut mechanism (101) located outside the connecting brackets (103), a parallelogram telescopic mechanism (102) connected to the screw nut mechanism (101), a cable device (105) fixed to the front end of the dust collection hood (1), and a folding cover (104) connected to the cable device (105).

2. The collapsible mobile casting plant dust hood of claim 1, wherein, The parallelogram telescopic mechanism (102) is composed of several first frames (1022) and adopts an X-shaped stacking structure.

3. The foldable mobile dust collection hood for casting workshop according to claim 2, characterized in that, The first skeleton (1022) uses self-compensating clearance bearings (1021).

4. The foldable mobile dust collection hood for casting workshop according to claim 2, characterized in that, The lead screw and nut mechanism (101) includes a fixed plate (1012) with a groove and fixed below the top side edge of the dust collection hood (1), a first motor (1011) fixed on the fixed plate (1012), a lead screw (1013) connected to the output end of the first motor (1011), a ball nut (1014) that rotates in cooperation with the lead screw (1013), and the first frame (1022) is fixedly connected to the ball nut (1014) through a bearing slider.

5. The collapsible mobile casting plant dust hood of claim 1, wherein, The end of the parallelogram telescopic mechanism (102) is fixedly connected to the connecting bracket (103) through a connecting plate (1023) with a sliding groove.

6. The collapsible mobile casting plant dust hood of claim 1, wherein, Both the dust collection hood (1) and the folding hood (104) are made of high-silica fireproof cloth.

7. The collapsible mobile casting plant dust hood of claim 1, wherein, The connecting bracket (103) is composed of several horizontal brackets (1031) and an X-shaped frame (1032). The end of the horizontal bracket (1031) is equipped with a pulley (1034), and the side wall of the dust collection hood (1) is equipped with a slide rail (1033) for the pulley (1034) to slide.

8. The collapsible mobile casting plant dust hood of claim 1, wherein, The rotating mechanism (3) includes: a third motor (302) fixed on the support frame (301), a first pulley (303) connected to the output shaft of the third motor (302), a second pulley (304) that rotates with the first pulley (303) via a belt and is located on the outside of the dust collection pipe (2), and a rolling bearing (305) that rotates with the second pulley (304) on the inside. The rolling bearing (305) is located on the outside of the first dust collection pipe (201).

9. The foldable mobile dust collection hood for casting workshop according to claim 1, characterized in that, The folding cover (104) adopts a four-section nested frame cover (1041), and the folding cover (104) is equipped with a rotating hinge mechanism (1042) on both sides.

10. The collapsible mobile casting plant dust hood of claim 1, wherein, The cable device (105) is equipped with a second motor (1051), the output end of which is connected to a rotating shaft (1054). A collar (1052) for connecting a suspension rope (1053) is fixed on the rotating shaft (1054), and the other end of the suspension rope (1053) is connected to the uppermost folding cover (104).

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