A turning device and film winding machine

Abstract

The utility model discloses a kind of steering devices, install in the bottom of machine body, including by wheel, wheel axle, the steering wheel assembly of steering column composition, can be rotated around the vertical axis of steering column and realize steering, still include swing arm and elastic component, the swing arm can swing around vertical hinged axle, transmission assembly is arranged between the inner end of the swing arm with the steering wheel assembly, the outer end of the swing arm is equipped with guide wheel, the elastic component makes the steering wheel assembly be in steering position;The swing arm swings under the action of external resistance, to drive the steering wheel assembly rotate in opposite direction. The utility model can realize the function of automatic obstacle avoidance, reduce the floor space when vehicle body runs.

Description

Technical Field

[0001] This utility model relates to the field of wrapping machine technology, and in particular to a steering device for a wrapping machine. Background Technology

[0002] In the packaging industry, stretch wrapping machines are widely used to wrap various products with thin films to protect them and facilitate transportation. Currently, most stretch wrapping machines on the market have guide wheels that are fixedly mounted on the side of the machine body.

[0003] As disclosed in prior art CN220905413U, a flexible self-propelled wrapping machine uses an extension rod to mount the guide wheel on the left rear end of the self-propelled wheel fixing block. Due to the fixed installation of the extension rod, the guide wheel's position relative to the self-propelled wheel fixing block is fixed, preventing it from rotating back and forth and thus hindering automatic obstacle avoidance. Furthermore, this increases the machine's footprint during operation. Utility Model Content

[0004] The purpose of this invention is to provide a steering device for a wrapping machine to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A steering device, installed at the bottom of a machine body, includes a steering wheel assembly consisting of wheels, axles, and a steering column, which can rotate about the vertical axis of the steering column to achieve steering. It also includes a swing arm and an elastic component. The swing arm can swing about a vertical hinge axis. A transmission component is provided between the inner end of the swing arm and the steering wheel assembly. A guide wheel is installed at the outer end of the swing arm. The elastic component puts the steering wheel assembly in a steering position to bypass the corner of the cargo. The swing arm swings under the action of external resistance to drive the steering wheel assembly to rotate in the opposite direction.

[0007] Preferably, the transmission assembly includes a sliding column and a sliding groove. The sliding column is disposed at the inner end of the swing arm, and the sliding groove is disposed on the seat of the steering wheel assembly. The sliding section of the sliding groove is planar. The elastic component is a tension spring, one end of which is hinged to the seat and the other end of which is hinged to the machine body.

[0008] As a further preferred embodiment, the sliding section of the groove is a smooth curved surface, and at any contact position with the sliding column, the tangent direction of the smooth curved surface is parallel to the line segment formed by the axis of the steering column and the axis of the sliding column.

[0009] Preferably, a clearance hole is provided on one side of the body, and one end of the swing arm passes through the clearance hole and extends out of the body.

[0010] Preferably, the outer end of the swing arm has a protective cover, and the guide wheel is installed inside the protective cover and rotatably connected to the protective cover.

[0011] As a further preferred embodiment, the guide wheel extends at least partially beyond the protective cover.

[0012] Preferably, the transmission assembly is a gear assembly, the steering column is fitted with a small gear, the inner end of the swing arm is fixed with a large gear, and the axis of the large gear coincides with the axis of the hinge shaft.

[0013] Preferably, the transmission assembly is a sprocket and chain assembly, the steering column is fitted with a small sprocket, the inner end of the swing arm is fixed with a large sprocket, and the axis of the large sprocket coincides with the axis of the hinge shaft. It also includes at least one auxiliary sprocket, and the chain is fitted on the large sprocket and the auxiliary sprocket and meshes with the small sprocket.

[0014] Preferably, the elastic component is a torsion spring, disposed between the steering column and the body.

[0015] This utility model also provides a wrapping machine, including the aforementioned steering device.

[0016] In this invention, a compact transmission assembly is provided between the swing arm and the steering wheel assembly. The swing arm and the guide wheel deflect backward to drive the wrapping machine to turn, which not only avoids obstacles but also reduces the space occupied by the wrapping machine during operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the wrapping machine in this utility model;

[0018] Figure 2 This is a side view of the bottom of a wrapping machine according to one embodiment;

[0019] Figure 3 yes Figure 2 A partial sectional view of AA, showing the wrapping machine in a turning position;

[0020] Figure 4 This is a partial cross-sectional view of the wrapping machine in its traveling position;

[0021] Figure 5 This is a partial cross-sectional view of the wrapping machine in a clearance position;

[0022] Figure 6 yes Figure 3 Enlarged view at point D1;

[0023] Figure 7 yes Figure 5 Enlarged view at point D2;

[0024] Figure 8 This is a 3D schematic diagram of the bottom of the wrapping machine;

[0025] Figure 9 This is a bottom view of the wrapping machine;

[0026] Figure 10 This is a schematic diagram of the steering mechanism of a wrapping machine;

[0027] Figure 11 This is a partial cross-sectional view of the bottom of a wrapping machine according to another embodiment;

[0028] Figure 12 yes Figure 11 Enlarged view of point D3 in the middle.

[0029] In the diagram: 100, Body; 104, Mounting hole; 105, Clearance hole; 200, Steering device; 211, Seat; 212, Wheel; 213, Steering column; 220, Swing arm; 230, Tension spring; 221, Hinge shaft; 222, Guide wheel; 223, First bearing; 224, Mounting block; 225, Limiting plate; 226, Locking element; 227, Protective cover; 228, Tension spring seat; 229, Second bearing; 241, Sliding column; 242, Sliding groove; 2421, Sliding section; 243, Connecting element; 300, Drive device. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] See Figures 1 to 5 In this embodiment, the wrapping machine includes a body 100, a steering device 200, and a drive device 300, wherein the steering device and the drive device are mounted on the bottom of the body. The steering wheel assembly of the steering device 200 includes a seat 211, wheels 212, and a steering column 213. Two wheels 212 are mounted on the axles of the seat 211, and the steering column 213 is fixed to the seat 211. When the wrapping machine needs to turn, the steering wheel assembly is rotated by a predetermined angle around the vertical axis of the steering column 213.

[0034] The steering device 200 also includes a swing arm 220 and a tension spring 230. The swing arm 220 consists of two straight arms at an obtuse angle, and the joint of the two straight arms is mounted on the machine body via a vertical hinge shaft 221. A guide wheel 222 is mounted on the end (outer end) of the straight arm extending out of the machine body of the swing arm 220, and a sliding column 241 is provided on the end (inner end) of the straight arm near the steering wheel assembly of the swing arm 220. A sliding groove 242 is provided on the seat 211. One end of the tension spring 230 is hinged to the seat 211 of the steering wheel assembly, and the other end is hinged to the machine body 100. When the guide wheel 222 is not subjected to external resistance, the tension spring 230 keeps the steering wheel assembly in the steering position, such as... Figure 3 As shown, the swing arm 220 is also in the initial position. At this time, the wrapping machine moves along the curve direction t, thereby bypassing the corner of the goods and pallet.

[0035] like Figure 4 As shown, when the guide wheel 222 comes into contact with the goods P or the pallet, the swing arm 220 swings backward around the hinge shaft 221 under the action of external resistance, so that the guide wheel 222 moves closer to the machine body, which is clockwise c in the figure. It slides along the inner wall of the slide groove 242 through the slide column 241, and transmits the motion to the slide groove 242 and the seat 211. This causes the steering wheel assembly to overcome the elastic force of the tension spring 230 and rotate in the opposite direction to the swing of the swing arm 220, which is counterclockwise in the figure, until the steering wheel assembly is in the traveling position. At this time, the external resistance and the elastic force reach a balance, and the wrapping machine moves forward in a straight line f.

[0036] In this embodiment, a tension spring 230 is used as an elastic component, which not only serves the function of resetting the steering wheel assembly, but also ensures that the sliding column and the sliding groove are in close contact during sliding, stably and accurately transmitting motion and force. In other embodiments of this utility model, the elastic component can also be a torsion spring, with its two ends abutting against the steering column 213 and the body 100 respectively, which will not be described in detail here.

[0037] like Figure 5 As shown, during the forward movement of the wrapping machine, when the guide wheel 222 encounters an obstacle or a protruding part of the cargo P, the swing arm 220 continues to swing backward due to increased external resistance. This causes the guide wheel 222 to move further closer to the machine body and rotate the steering wheel assembly to the avoidance position. At this time, the wrapping machine moves along the curve direction a, thus moving away from the obstacle and cargo. The steering wheel assembly returns to the forward position only after the guide wheel 222 has passed the obstacle or the protruding part of the cargo and re-engages with the cargo P or pallet.

[0038] In this embodiment, the sliding column 241 and the sliding groove 242 constitute the transmission assembly between the swing arm and the steering wheel assembly. The steering device has a compact structure and is suitable for situations where the distance between the wrapping machine and the goods is small. Figure 6 yes Figure 3 Enlarged view at point D1 in the middle. Figure 7 yes Figure 5 Enlarged view of point D2. See also Figure 6 and Figure 7 The inner wall of the groove 242 includes a sliding section 2421 and a non-sliding section. When the steering wheel assembly is in the steering position, the sliding column 241 abuts against point M on the inner wall of the groove 242; when the steering wheel assembly is in the avoidance position, the sliding column 241 abuts against point N on the inner wall of the groove 242. The swing arm 220 drives the sliding column 241 to slide between points M and N on the inner wall of the groove 242, causing the steering wheel assembly to rotate from the steering position to the avoidance position. Therefore, the sliding section 2421 refers to the MN section of the inner wall of the groove 242. In other embodiments, from the steering position to the avoidance position, if the rotation angle of the steering wheel assembly increases / decreases, the range of the inner wall of the groove 242 corresponding to the sliding section 2421 also increases / decreases accordingly.

[0039] In this embodiment, the sliding section 2421 is a plane, and the non-sliding section refers to the other part of the inner wall of the groove 242, including a plane and two arc surfaces. Its function is to limit the extreme position of the sliding column 241. The shape and form of the non-sliding section are not limited.

[0040] See Figures 8 to 10The sliding column 241 is mounted on the inner end of the swing arm 220 via a connector 243. In this embodiment, the connector 243 can be a bolt, and the connector 243 is threadedly connected to the swing arm 220, which facilitates the installation or removal of the sliding column 241. In other embodiments, the connector 243 can also be a pivot, allowing the sliding column 241 to rotate freely at the inner end of the swing arm.

[0041] Furthermore, as a preferred embodiment, the hinge shaft 221 is mounted on the outer side of the body 100, and the swing arm 220 is rotatably connected to the hinge shaft 221 via a first bearing 223. In this embodiment, the first bearing 223 is installed in the middle of the swing arm 220, and the hinge shaft 221 passes through the first bearing 223. This not only ensures that the swing arm 220 can rotate flexibly around the hinge shaft 221, but also reduces friction during rotation and improves the operational stability of the swing arm. In this embodiment, when the swing arm rotates backward towards the limit position of the body, a certain gap remains between the guide wheel 222 and the body 100, which ensures the normal rotation of the guide wheel.

[0042] Furthermore, as a preferred embodiment, it also includes a mounting block 224. The body 100 has a mounting hole 104, and the mounting block 224 extends into the mounting hole 104 and is fixed to the body. The hinge shaft 221 is fixedly connected to the mounting block 224. The upper part of the hinge shaft 221 is provided with a limiting piece 225 and a locking member 226. The diameter of the upper part of the hinge shaft 221 is smaller than the diameter of the lower part. The first bearing 223 is installed in the lower part of the hinge shaft 221. A through hole is provided on the mounting block 224, through which the upper part of the hinge shaft 221 passes. The larger diameter of the lower part allows for positioning of the mounting block 224. The locking member 226 is a nut, threadedly connected to the upper part of the hinge shaft 221. The locking member 226 locks the limiting piece 225 onto the hinge shaft 221. The limiting piece 225 is a washer, which prevents the hinge shaft 221 from detaching from the mounting block 224 and also facilitates disassembly and replacement.

[0043] Furthermore, as a preferred embodiment, the body 100 is provided with a clearance hole 105, through which the swing arm 220 passes and extends outward, providing space for the movement of the swing arm 220 and the guide wheel 222, thus avoiding interference with the body.

[0044] Furthermore, as a preferred embodiment, the outer end of the swing arm 220 has a protective cover 227, and a guide wheel 222 is installed inside the protective cover 227 and rotatably connected to the protective cover. The guide wheel 222 extends at least partially out of the protective cover 227, ensuring that the guide wheel can normally contact the goods or pallet and perform its guiding function. The two ends of the guide wheel are rotatably connected to the protective cover through axles.

[0045] Furthermore, as a preferred embodiment, tension spring seats are respectively provided on the base 211 and the body 100, and the two ends of the tension spring 230 are respectively connected to a tension spring seat. For example, the tension spring seat 228 is installed on the upper surface of the base 211, wherein one end of the tension spring seat 228 has a threaded rod, and the base 211 is provided with a threaded hole that mates with the threaded rod. This facilitates the adjustment of the height of the tension spring seat and makes it easier to keep the two tension spring seats at the same height as much as possible. A connecting hole is provided on the tension spring seat 228, and the hooks at both ends of the tension spring 230 are connected to the connecting hole.

[0046] Furthermore, as a preferred embodiment, the steering column 213 is connected to the engine block 100 via a second bearing 229. The lower end of the steering column is provided with external threads, and the seat 211 is fixed to the steering column by a nut. Figure 10 As shown. In other embodiments, the upper end of the steering column may be externally connected to a structural component such as a handle.

[0047] See Figure 11 and Figure 12 , Figure 12 yes Figure 11 Enlarged view at point D3. The axis of the steering column 213 is O1, and the axis of the sliding column 241 is O2, forming a line segment O1-O2. In another embodiment, the sliding segment 2421 is a smooth curved surface, such that when the sliding column 241 abuts against the inner wall of the groove 242 at point S, the tangent direction of the sliding segment 2421 at point S is parallel to the line segment O1-O2. Since the sliding column 241 is freely rotating, or the inner wall of the groove 242 is sufficiently smooth, the friction between them is very small. The abutting force can be approximated as passing through the axis of the sliding column 241. Therefore, relative to the axis O1 of the steering column 213, the lever arm of the abutting force on the inner wall of the groove 242 at any abutting position is close to its maximum value, that is, close to the length of the line segment O1-O2.

[0048] This design increases the deflection torque of the swing arm, making the rotation of the steering wheel assembly more sensitive, thereby reducing the resistance experienced by the guide wheel when the wrapping machine moves forward. Furthermore, the increased deflection torque also helps to reduce the length of the straight arm of the swing arm 220 extending out of the machine body, i.e., the distance from the axis of the guide wheel 222 to the axis of the hinge shaft 221, further shortening the distance between the wrapping machine and the goods, and reducing the space occupied by the wrapping machine during operation.

[0049] In another embodiment of this utility model, the transmission component between the swing arm and the steering wheel assembly is a gear assembly, not shown in the figure. Specifically, unlike the above scheme, the swing arm consists only of a straight arm extending from the machine body. That is, one end of the swing arm is rotatably mounted on the machine body via a hinge shaft, and the other end is equipped with a guide wheel. Moreover, a large gear is fixed to the hinge end of the swing arm, that is, the axis of the large gear coincides with the axis of the hinge shaft. A small gear is sleeved on the steering column and meshes with the large gear for transmission. The swing arm swings under the action of external resistance and drives the steering wheel assembly to rotate through the large and small gears. Other structures are the same as the above scheme and will not be described again. This arrangement not only makes the structure more compact, but also, by setting the transmission ratio of the large and small gears, the rotation angle of the steering wheel assembly can be increased while keeping the swing angle of the swing arm unchanged, thereby avoiding large obstacles, such as obstacles with right angles.

[0050] In another embodiment of this invention, the transmission component between the swing arm and the steering wheel assembly is a sprocket and chain assembly, the principle of which is similar to that of a gear assembly. One end of the swing arm is rotatably mounted on the machine body via a hinge shaft, and the other end is equipped with a guide wheel. Furthermore, a large sprocket is fixed to the hinge end of the swing arm, meaning that the axis of the large sprocket coincides with the axis of the hinge shaft. A small sprocket is fitted onto the steering column, and at least one auxiliary sprocket is also included. The chain is fitted onto the large sprocket and the auxiliary sprocket and meshes externally with the small sprocket. The purpose of this chain arrangement is to make the swing direction of the swing arm opposite to the rotation direction of the steering column (i.e., the steering wheel assembly).

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steering device, installed at the bottom of an engine body, comprising a steering wheel assembly consisting of wheels, axles, and a steering column, capable of rotating about the vertical axis of the steering column to achieve steering, characterized in that, It also includes a swing arm and an elastic component. The swing arm can swing about a vertical hinge axis. A transmission component is provided between the inner end of the swing arm and the steering wheel assembly. A guide wheel is installed at the outer end of the swing arm. The elastic component puts the steering wheel assembly in a turning position to bypass the corner of the cargo. The swing arm swings under the action of external resistance to drive the steering wheel assembly to rotate in the opposite direction.

2. The steering device as described in claim 1, characterized in that, The transmission assembly includes a sliding column and a sliding groove. The sliding column is disposed at the inner end of the swing arm, and the sliding groove is disposed on the seat of the steering wheel assembly. The sliding section of the sliding groove is a plane. The elastic component is a tension spring, one end of which is hinged to the seat and the other end of which is hinged to the machine body.

3. The steering device as described in claim 2, characterized in that, The sliding section of the groove is a smooth curved surface. At any contact position with the sliding column, the tangent direction of the smooth curved surface is parallel to the line segment formed by the axis of the steering column and the axis of the sliding column.

4. The steering device according to any one of claims 1 to 3, characterized in that, A clearance hole is provided on one side of the body, and the outer end of the swing arm passes through the clearance hole and extends out of the body.

5. The steering device according to any one of claims 1 to 3, characterized in that, The outer end of the swing arm has a protective cover, and the guide wheel is installed inside the protective cover and rotatably connected to the protective cover.

6. The steering device as described in claim 5, characterized in that, The guide wheel extends at least partially beyond the protective cover.

7. The steering device as claimed in claim 1, characterized in that, The transmission assembly is a gear assembly, the steering column is fitted with a small gear, the inner end of the swing arm is fixed with a large gear, and the axis of the large gear coincides with the axis of the hinge shaft.

8. The steering device as claimed in claim 1, characterized in that, The transmission assembly is a sprocket and chain assembly. The steering column is fitted with a small sprocket, and the inner end of the swing arm is fixed with a large sprocket. The axis of the large sprocket coincides with the axis of the hinge shaft. It also includes at least one auxiliary sprocket. The chain is fitted on the large sprocket and the auxiliary sprocket and meshes with the small sprocket.

9. The steering device according to any one of claims 1 to 3, characterized in that, The elastic component is a torsion spring, which is disposed between the steering column and the body.

10. A wrapping machine, characterized in that, Includes the steering device as described in any one of claims 1 to 9.

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