Anti-falling device for flue-curing barn tobacco clamp loading and unloading and flue-curing barn tobacco clamp loading and unloading equipment

Abstract

The utility model discloses an anti-falling device for assembling and disassembling a tobacco clamp of a curing barn and equipment for assembling and disassembling the tobacco clamp of the curing barn, and the anti-falling device comprises a mounting frame which comprises a stand column and a cross beam, and the cross beam is movably arranged on the stand column; the limiting column is detachably arranged on the stand column; the limiting structure is arranged at the bottom of the cross beam, the limiting structure and the limiting column are located on the same side of the stand column, the limiting structure can rotate in the clockwise direction, and the cross beam is used for preventing the limiting structure from rotating in the anticlockwise direction; when the cross beam moves downwards along the stand column, the bottom plane of the limiting structure abuts against the limiting column so as to limit further movement of the cross beam. When the cross beam moves upwards along the stand column, the top plane of the limiting structure abuts against the limiting column so that the limiting structure can rotate in the clockwise direction, and the limiting structure can pass through the limiting column. By means of the arrangement, the limiting structures and the limiting columns can prevent the cross beam from moving downwards, and the cross beam is prevented from falling and hurting workers below while lifting of the cross beam is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to tobacco leaf baking technical field, including a kind of tobacco leaf baking house tobacco clamp mounting and dismounting anti-falling device and tobacco leaf baking house tobacco clamp mounting and dismounting equipment. BACKGROUND

[0002] Current tobacco production has generally adopted large-scale intensive baking house instead of old brick-concrete structure baking house, and the intensive baking house has the characteristics of large tobacco loading capacity, energy saving, labor saving and high baking efficiency, but the tobacco baking is still a labor-intensive agricultural activity, and when the tobacco leaves are hung in the baking house, the height of the baking house is high, and the frame for hanging the tobacco leaves is fixed, so the workers often need to use ladders and other tools to climb and hang, which not only increases the labor intensity of the workers and reduces the efficiency, but also has high safety risks.

[0003] In the prior art, when the tobacco clamp is lifted by one layer by the mechanical equipment, the worker needs to work below the tobacco clamp, and in this process, if the mechanical equipment malfunctions or the connection is disconnected, the tobacco clamp will fall and injure the worker and cause damage to the tobacco leaves, which has safety hazards. SUMMARY

[0004] In view of the above defects or deficiencies in the prior art, the utility model provides a tobacco clamp mounting and dismounting anti-falling device for tobacco baking house and a tobacco clamp mounting and dismounting equipment for tobacco baking house.

[0005] To achieve the above-mentioned purpose, the utility model provides a tobacco clamp mounting and dismounting anti-falling device for tobacco baking house, which comprises:

[0006] A mounting frame comprising a stand column and a cross beam, wherein the cross beam is movably arranged on the stand column;

[0007] A limiting column which is detachably arranged on the stand column, wherein the limiting column and the cross beam are located on different sides of the stand column;

[0008] A limiting structure arranged at the bottom of the cross beam, wherein the limiting structure and the limiting column are located on the same side of the stand column, the limiting structure can rotate clockwise, and the cross beam is used to prevent the limiting structure from rotating counterclockwise;

[0009] When the cross beam moves downward along the stand column, the bottom plane of the limiting structure abuts against the limiting column to limit the further movement of the cross beam;

[0010] When the cross beam moves upward along the stand column, the top plane of the limiting structure abuts against the limiting column to make the limiting structure rotate clockwise, so that the limiting structure passes through the limiting column.

[0011] Preferably, the limiting structure comprises a first platform, a second platform and a third platform;

[0012] The second platform is fixedly connected to the top surface of the first platform and is located at the center of the first platform; the third platform is fixedly connected to the top surface of the second platform and is located near the limiting post.

[0013] When the limiting structure is installed at the bottom of the crossbeam, the top surface of the third platform contacts the bottom plane of the crossbeam, the axis of rotation of the limiting structure is perpendicular to the surface of the limiting post, the center of rotation is located at the connection between the first platform and the second platform, and is correspondingly set to the side wall of the third platform away from the limiting post.

[0014] Preferably, the third platform includes a first top surface and a first side surface, the first side surface and the first top surface are arranged perpendicular to each other, when the limiting structure is installed at the bottom of the crossbeam, the first top surface is in contact with the bottom plane of the crossbeam, the first side surface is arranged away from the limiting post, and the first side surface is arranged corresponding to the rotation center;

[0015] An arc-shaped transition section is provided at the connection between the first top surface and the first side surface. The arc-shaped transition section is configured as an arc and is used to assist the limiting structure in rotating relative to the crossbeam.

[0016] Preferably, the distance from the side wall of the second platform away from the limiting post to the rotation center is less than the distance from the top surface of the third platform to the rotation center.

[0017] Preferably, the first platform includes a second top surface, a second side surface, a third side surface, and a first bottom surface;

[0018] The second top surface is perpendicular to the second side surface, the second top surface is connected to the third side surface at an angle, and the third side surface is inclined away from the second platform and the second side surface;

[0019] The first bottom surface is disposed opposite to the second top surface, the first bottom surface is disposed perpendicular to the second side surface, and the first bottom surface is connected to the third side surface at an angle.

[0020] Preferably, a first mounting plate and a second mounting plate are provided at the bottom of the crossbeam, the first mounting plate and the second mounting plate are parallel to the surface of the limiting post, the first mounting plate and the second mounting plate are spaced apart, and the second mounting plate is provided close to the column;

[0021] A first through hole is provided on the first mounting plate and the second mounting plate, and a second through hole is provided at the rotation center of the limiting structure. The first through hole and the second through hole are used for the insertion of a rotating shaft. The limiting structure is rotatably connected between the first mounting plate and the second mounting plate through the rotating shaft.

[0022] Preferably, a reset device is provided on the rotating shaft, which is used to reset the limiting structure after rotation.

[0023] Preferably, at least one limiting post is provided.

[0024] Preferably, the angle between the second top surface and the third side surface is in the range of 140°-160°.

[0025] To achieve the above objectives, this utility model also provides a tobacco clamp loading and unloading device for a tobacco curing barn, including a fall prevention device, a frame, a drive assembly, and a tobacco carrying frame as described above.

[0026] The tobacco carrying racks are respectively installed on two opposite sides of the frame, and the two tobacco carrying racks are fixedly connected by the crossbeam. The uprights are installed on the side of the frame where the tobacco carrying racks are installed.

[0027] The drive assembly is connected to the crossbeam to control the lifting and lowering of the tobacco rack. The anti-fall device for loading and unloading tobacco clamps in the curing barn is used to prevent the tobacco rack from falling when the drive assembly is disconnected.

[0028] Based on this, the beneficial effects of this utility model are as follows:

[0029] 1. The present invention provides a limiting post on the column and a limiting structure at the bottom of the crossbeam. When the crossbeam falls, the limiting structure can abut against the limiting post, thereby limiting the further movement of the crossbeam and preventing it from falling.

[0030] 2. With the solution of this utility model, the limiting structure is rotatably connected to the bottom of the crossbeam, and the third side of the first platform is inclined so that when the crossbeam moves down, the limiting structure cannot rotate after abutting with the limiting post, thus restricting the movement of the crossbeam. When the crossbeam moves up, the limiting post abuts with the third side, and the limiting structure can rotate, thus allowing the limiting post to slide along the third side so that the crossbeam can continue to move without affecting the normal upward movement of the crossbeam, only limiting the fall of the crossbeam. Attached Figure Description

[0031] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 A schematic diagram illustrating the structure of a fall protection device according to one embodiment of the present invention;

[0033] Figure 2 A schematic diagram illustrating the usage state of a fall arrest device according to one embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram illustrating the structure of a tobacco clamp loading and unloading device for a curing barn according to one embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 10-Mounting frame, 101-Column, 102-Beam, 1021-First mounting plate, 1022-Second mounting plate, 1023-Rotation axis, 20-Limiting column, 30-Limiting structure, 301-First platform, 3011-Second top surface, 3012-Second side surface, 3013-Third side surface, 3014-First bottom surface, 302-Second platform, 303-Third platform, 3031-First top surface, 3032-First side surface, 3033-Arc-shaped transition section, 3034-Fourth side surface, 40-Frame, 50-Drive assembly, 60-Smoke rack. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a," "the," and "the" as used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should be understood that although the terms first, second, third, etc., may be used to describe related structures in the embodiments of this application, these related structures should not be limited to these terms. These terms are only used to distinguish related structures from each other.

[0039] Depending on the context, the word "if" as used here can be interpreted as "when" or "when". Similarly, depending on the context, the phrase "if determined" can be interpreted as "when determined" or "when (the condition or event of the statement) is detected".

[0040] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.

[0041] Figure 1 This is a schematic diagram illustrating the structure of a fall protection device according to one embodiment of the present invention. Figure 2 This diagram illustrates the usage state of a fall arrestor according to one embodiment of the present invention, as shown below. Figure 1 , 2 As shown, this utility model discloses a fall prevention device for loading and unloading tobacco clamps in a tobacco curing barn, comprising:

[0042] The mounting frame 10 includes a column 101 and a crossbeam 102, with the crossbeam 102 movably mounted on the column 101.

[0043] The limiting post 20 is detachably mounted on the column 101, and the limiting post 20 and the crossbeam 102 are located on different sides of the column 101.

[0044] The limiting structure 30 is located at the bottom of the crossbeam 102. The limiting structure 30 and the limiting post 20 are located on the same side of the column 101. The limiting structure 30 can rotate clockwise, and the crossbeam 102 is used to prevent the limiting structure 30 from rotating counterclockwise.

[0045] When the crossbeam 102 moves downward along the column 101, the bottom plane of the limiting structure 30 abuts against the limiting column 20 to limit the further movement of the crossbeam 102.

[0046] When the crossbeam 102 moves upward along the column 101, the top plane of the limiting structure 30 abuts against the limiting column 20 to make the limiting structure 30 rotate clockwise so that the limiting structure 30 passes through the limiting column 20.

[0047] Specifically, the crossbeam 102 can move vertically relative to the column 101. When the crossbeam 102 moves downward, the limiting structure 30 at its bottom abuts against the limiting column 20, thereby preventing the crossbeam 102 from moving further downward and achieving the limiting function. At the same time, when the crossbeam 102 moves upward, the top surface of the limiting structure 30 touches the limiting column 20, which allows the limiting structure 30 to rotate clockwise, thereby allowing the limiting structure 30 to move upward through the limiting column 20 and realize the upward movement of the crossbeam 102.

[0048] With this configuration, when the crossbeam 102 falls, the limiting column 20 and the limiting structure 30 can limit it and prevent it from injuring the workers below.

[0049] Furthermore, the limiting structure 30 includes a first platform 301, a second platform 302, and a third platform 303;

[0050] The second platform 302 is fixedly connected to the top surface of the first platform 301 and is located at the center of the first platform 301. The third platform 303 is fixedly connected to the top surface of the second platform 302 and is located near the limiting post 20.

[0051] When the limiting structure 30 is installed at the bottom of the crossbeam 102, the top surface of the third platform 303 contacts the bottom plane of the crossbeam 102. The axis of rotation of the limiting structure 30 is perpendicular to the surface of the limiting post 20. The center of rotation is located at the connection between the first platform 301 and the second platform 302, and is correspondingly set to the side wall of the third platform 303 away from the limiting post 20.

[0052] Specifically, when the limiting structure 30 is installed at the bottom of the crossbeam 102, the top surface of the third platform 303 abuts against it. Then, when the crossbeam 102 moves down, the bottom surface of the first platform 301 abuts against it, thus limiting the movement of the crossbeam 102 and preventing the crossbeam 102 from falling and injuring workers.

[0053] Furthermore, the third platform 303 includes a first top surface 3031 and a first side surface 3032. The first side surface 3032 is perpendicular to the first top surface 3031. When the limiting structure 30 is installed at the bottom of the crossbeam 102, the first top surface 3031 is in contact with the bottom plane of the crossbeam 102, the first side surface 3032 is located away from the limiting post 20, and the first side surface 3032 is corresponding to the rotation center.

[0054] An arc-shaped transition portion 3033 is provided at the connection between the first top surface 3031 and the first side surface 3032. The arc-shaped transition portion 3033 is set in the shape of a circular arc and is used to assist the limiting structure 30 in rotating relative to the crossbeam 102.

[0055] Specifically, the third platform 303 also includes a fourth side 3034, which is set relative to the first side 3032. The fourth side 3034 is perpendicularly connected to the first top surface 3031. When the limiting structure 30 is installed at the bottom of the crossbeam 102, the third platform 303 and the limiting column 20 are located on the same side of the rotation center.

[0056] When the crossbeam 102 moves down and touches the limiting post 20, the first top surface 3031 contacts the bottom surface of the crossbeam 102, and the first top surface 3031 and the fourth side surface 3034 are connected at right angles, so that the limiting structure 30 cannot rotate counterclockwise, thereby limiting the crossbeam 102.

[0057] When the crossbeam 102 moves upward, the limiting post 20 touches the top surface of the first platform 301 of the limiting structure 30, giving the limiting structure 30 a clockwise rotation tendency. At the same time, through the setting of the arc transition part 3033 between the first top surface 3031 and the first side surface 3032, the limiting structure 30 can rotate clockwise along the arc transition 3033, thereby causing the limiting post 20 to gradually move until it leaves the first platform 301 and moves to the bottom of the limiting post 20, realizing the upward movement of the crossbeam 102.

[0058] Furthermore, the distance from the side wall of the second platform 302 away from the limiting post 20 to the center of rotation is less than the distance from the top surface of the third platform 303 to the center of rotation. This setting avoids the second platform 302 from contacting the bottom of the crossbeam 102 when the limiting structure 30 rotates clockwise, thus limiting the rotation of the limiting structure 30 and causing the limiting post 20 to be unable to move away from the limiting structure 30, resulting in the crossbeam being unable to continue moving upward.

[0059] Furthermore, the first platform 301 includes a second top surface 3011, a second side surface 3012, a third side surface 3013, and a first bottom surface 3014;

[0060] The second top surface 3011 is perpendicular to the second side surface 3012, the second top surface 3011 is connected to the third side surface 3013 at an angle, and the third side surface 3013 is inclined away from the second platform 302 and the second side surface 3012.

[0061] The first bottom surface 3014 is disposed opposite to the second top surface 3011, the first bottom surface 3014 is disposed perpendicular to the second side surface 3012, and the first bottom surface 3014 is connected to the third side surface 3013 at an angle.

[0062] Specifically, the angle between the second top surface 3011 and the third side surface 3013 is in the range of 140°-160°. By setting the third side surface 3013 as an inclined slope, when the crossbeam 102 moves upward and the limiting post 20 abuts against the limiting structure 30, the inclined slope of the third side surface 3013 makes it easier for the limiting post 20 to slide out of the limiting structure 30, thereby realizing the upward movement operation of the crossbeam 102.

[0063] Furthermore, a first mounting plate 1021 and a second mounting plate 1022 are provided at the bottom of the crossbeam 102. The first mounting plate 1021 and the second mounting plate 1022 are parallel to the surface of the limiting column 20. The first mounting plate 1021 and the second mounting plate 1022 are spaced apart, and the second mounting plate 1022 is located close to the column 101.

[0064] A first through hole (not shown in the figure) is provided on the first mounting plate 1021 and the second mounting plate 1022, and a second through hole (not shown in the figure) is provided at the rotation center of the limiting structure 30. The first through hole and the second through hole are used for the insertion of the rotating shaft 1023. The limiting structure 30 is rotatably connected between the first mounting plate 1021 and the second mounting plate 1022 through the rotating shaft 1023.

[0065] Furthermore, a reset device (not shown in the figure) is provided on the rotating shaft 1023. Specifically, it can be a spring. The spring is sleeved on the rotating shaft 1023. When the limiting structure 30 is abutted by the limiting post 20 and rotates clockwise, the spring is compressed. When the limiting post 20 leaves the limiting structure 30 and no longer applies pressure, the limiting structure 30 is reset by the spring and returns to a horizontal state. In this way, when the crossbeam 102 moves up and then down, the bottom of the limiting structure 30 can continue to abut against the limiting post 20, thus realizing the anti-fall function of the crossbeam 102.

[0066] Furthermore, at least one limiting post 20 is provided. When multiple limiting posts 20 are provided, the beam 102 at different positions can be limited.

[0067] Furthermore, Figure 3 This schematic diagram illustrates the structure of a tobacco clamp loading and unloading device for a curing barn according to one embodiment of the present invention, as shown below. Figure 3 As shown, this utility model also provides a tobacco clamp loading and unloading device for a tobacco curing barn, which includes the aforementioned anti-fall device, frame 40, drive assembly 50 and tobacco carrying frame 60;

[0068] The tobacco carrying racks 60 are respectively set on two opposite sides of the frame 40, and the two tobacco carrying racks 60 are fixedly connected by a crossbeam 102. The uprights 101 are set on the side of the frame 40 where the tobacco carrying racks 60 are set.

[0069] The drive assembly 50 is connected to the crossbeam 102 to control the lifting and lowering of the tobacco rack 60. The anti-fall device for loading and unloading tobacco clamps in the curing barn is used to prevent the tobacco rack 60 from falling when the drive assembly 50 is disconnected.

[0070] Specifically, the tobacco rack 60 is used to place tobacco clips. The tobacco rack 60 is lifted by the drive component 50, so that tobacco clips can be placed at different heights on the tobacco rack 60, thereby achieving layering of tobacco leaves and increasing the tobacco leaf capacity of the rack 40.

[0071] After the tobacco-carrying frame 60 has finished loading the first layer of tobacco, the drive assembly 50 controls the lifting of the tobacco-carrying frame 60 and controls it to be suspended at a certain position. Workers can then enter under the tobacco-carrying frame 60 to continue loading the second layer of tobacco. During this process, the anti-fall device can prevent the tobacco-carrying frame 60 from falling when the connection with the drive assembly 50 is broken, thus preventing the tobacco-carrying frame 60 from falling and injuring workers, and also preventing damage to the tobacco leaves when the tobacco-carrying frame 60 falls.

[0072] By setting multiple limit posts 20, the tobacco carrying frame 60 can be prevented from falling when it is raised to different heights, thus protecting the workers and the tobacco leaves.

[0073] In summary, by setting up the fall prevention device of this utility model, the further movement of the crossbeam 102 can be restricted when it moves downward, so as to prevent it from hitting and injuring the workers working at the bottom. At the same time, when the crossbeam 102 moves upward, the arc-shaped transition part 3033 can assist the rotation of the limiting structure 30, so that the limiting post 20 slides out of the limiting structure 30, without affecting the upward movement of the crossbeam 102.

[0074] The above description is merely a preferred embodiment of this application. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A fall-prevention device for loading and unloading tobacco clamps in a tobacco curing barn, characterized in that, include: The mounting frame includes uprights and crossbeams, the crossbeams being movably mounted on the uprights; A limiting post is detachably mounted on the column, and the limiting post and the crossbeam are located on different sides of the column. A limiting structure is provided at the bottom of the crossbeam. The limiting structure and the limiting post are located on the same side of the column. The limiting structure can rotate clockwise, and the crossbeam is used to prevent the limiting structure from rotating counterclockwise. When the crossbeam moves downward along the column, the bottom plane of the limiting structure abuts against the limiting column to limit further movement of the crossbeam; When the crossbeam moves upward along the column, the top plane of the limiting structure abuts against the limiting column, causing the limiting structure to rotate clockwise so that the limiting structure passes through the limiting column.

2. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 1, characterized in that, The limiting structure includes a first platform, a second platform, and a third platform; The second platform is fixedly connected to the top surface of the first platform and is located at the center of the first platform; the third platform is fixedly connected to the top surface of the second platform and is located near the limiting post. When the limiting structure is installed at the bottom of the crossbeam, the top surface of the third platform contacts the bottom plane of the crossbeam, the axis of rotation of the limiting structure is perpendicular to the surface of the limiting post, the center of rotation is located at the connection between the first platform and the second platform, and is correspondingly set to the side wall of the third platform away from the limiting post.

3. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 2, characterized in that, The third platform includes a first top surface and a first side surface. The first side surface and the first top surface are arranged perpendicular to each other. When the limiting structure is installed at the bottom of the crossbeam, the first top surface is in contact with the bottom plane of the crossbeam, the first side surface is arranged away from the limiting post, and the first side surface is arranged corresponding to the rotation center. An arc-shaped transition section is provided at the connection between the first top surface and the first side surface. The arc-shaped transition section is configured as an arc and is used to assist the limiting structure in rotating relative to the crossbeam.

4. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 2, characterized in that, The distance from the side wall of the second platform away from the limiting post to the rotation center is less than the distance from the top surface of the third platform to the rotation center.

5. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 2, characterized in that, The first platform includes a second top surface, a second side surface, a third side surface, and a first bottom surface; The second top surface is perpendicular to the second side surface, the second top surface is connected to the third side surface at an angle, and the third side surface is inclined away from the second platform and the second side surface; The first bottom surface is disposed opposite to the second top surface, the first bottom surface is disposed perpendicular to the second side surface, and the first bottom surface is connected to the third side surface at an angle.

6. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 2, characterized in that, A first mounting plate and a second mounting plate are provided at the bottom of the crossbeam. The first mounting plate and the second mounting plate are parallel to the surface of the limiting column. The first mounting plate and the second mounting plate are spaced apart. The second mounting plate is located close to the column. A first through hole is provided on the first mounting plate and the second mounting plate, and a second through hole is provided at the rotation center of the limiting structure. The first through hole and the second through hole are used for the insertion of a rotating shaft. The limiting structure is rotatably connected between the first mounting plate and the second mounting plate through the rotating shaft.

7. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 6, characterized in that, A reset device is provided on the rotating shaft, which is used to reset the limiting structure after rotation.

8. The anti-fall device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 1, characterized in that, At least one limiting post shall be provided.

9. A fall-prevention device for loading and unloading tobacco clamps in a tobacco curing barn according to claim 5, characterized in that, The angle between the second top surface and the third side surface ranges from 140° to 160°.

10. A tobacco clamp loading and unloading device for a tobacco curing barn, characterized in that, Includes a fall prevention device, frame, drive assembly, and tobacco carrying frame for loading and unloading tobacco clamps in a curing barn, as described in any one of claims 1-9; The tobacco carrying racks are respectively installed on two opposite sides of the frame, and the two tobacco carrying racks are fixedly connected by the crossbeam. The uprights are installed on the side of the frame where the tobacco carrying racks are installed. The drive assembly is connected to the crossbeam to control the lifting and lowering of the tobacco rack. The anti-fall device for loading and unloading tobacco clamps in the curing barn is used to prevent the tobacco rack from falling when the drive assembly is disconnected.

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