A bale wrapper belt feed and tensioning apparatus

Abstract

The utility model provides packing machine's send and retreats the belt and the device of tightening the belt, and the cooperation point of tightening wheel is located the just below of send and retreats the belt driving wheel, and send and retreats the belt compression wheel is located the first side of send and retreats the belt driving wheel, and make the central angle between the cooperation point of send and retreats the belt driving wheel and the cutting point of packing belt of top corresponding top belt way of send and retreats the belt driving wheel top between greater than or equal to 155 DEG less than or equal to 190 DEG, the central angle between the cooperation point of send and retreats the belt driving wheel side corresponding send and retreats the belt compression wheel and the cutting point between greater than or equal to 60 DEG less than or equal to 120 DEG. The utility model sends the belt speed fast, provides greater packing belt package angle when sending the belt, further, tightening wheel can provide better guide function, improves the stability and fluency of sending the belt, satisfies the use requirement of light thin packing belt, and, simple structure, order a drive mechanism, can complete the position switching of tightening wheel and send and retreats the belt compression wheel.

Description

Technical Field

[0001] This utility model relates to a packing machine, and more particularly to a packing machine's feeding and tensioning strap device. Background Technology

[0002] A strapping machine is a device that uses strapping tape to bundle items. The entire strapping process involves several steps, including tape feeding, tape retraction, tensioning, and heat sealing. For a tape feeding / retraction and tensioning device consisting of three wheels—a drive wheel, a pressure wheel, and a tensioning wheel—the pressure wheel and tensioning wheel rest against the drive wheel during tape feeding and tensioning operations, respectively. This type of strapping machine's tape feeding / retraction and tensioning device is prone to slippage when feeding thin tape, affecting the strapping process. Utility Model Content

[0003] The purpose of this utility model is to provide a strapping machine's feeding and tensioning device to solve the problems mentioned in the background art and improve the working quality of such a device when using thin straps. To this end, this utility model adopts the following technical solution:

[0004] The strapping machine's feeding and tensioning device includes a tensioning wheel, a feeding and tensioning pressure wheel, and a feeding and tensioning drive wheel. The feeding and tensioning pressure wheel and the feeding and tensioning drive wheel cooperate to form a feeding and tensioning wheel assembly, and the tensioning wheel and the feeding and tensioning drive wheel cooperate to form a tensioning wheel assembly. A top guideway is provided on the top of the feeding and tensioning drive wheel. The device is characterized in that the tensioning wheel is located directly below the feeding and tensioning drive wheel, and the feeding and tensioning pressure wheel is located on the first side of the feeding and tensioning drive wheel, such that the central angle between the mating point of the feeding and tensioning drive wheel and the tangent point of the strapping tape on the top of the feeding and tensioning drive wheel corresponding to the top guideway is greater than or equal to 155°, and the central angle between the mating point of the feeding and tensioning drive wheel and the tangent point on the top of the feeding and tensioning drive wheel corresponding to the top guideway is greater than or equal to 60°.

[0005] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[0006] The central angle between the mating point of the feed-retractor drive wheel and the tension wheel and the tangent point of the packing strap on the top of the feed-retractor drive wheel corresponding to the top of the top belt path is less than or equal to 190°, and the central angle between the mating point of the feed-retractor drive wheel side corresponding to the tangent point and the tangent point is less than or equal to 120°.

[0007] The feed and tension belt device has an upward-sloping bottom belt track on the second side corresponding to the tensioning wheel.

[0008] The feed and unload drive wheel is connected to the first bidirectional drive motor and can rotate actively in both directions. The tension wheel and the feed and unload pressure wheel are arranged circumferentially along the feed and unload drive wheel. In the unloading and tensioning direction, the tension wheel is located downstream of the feed and unload pressure wheel.

[0009] The tensioning wheel and the feed-and-retreat pressure wheel are respectively mounted on the swing arm. The inner side of the feed-and-retreat pressure wheel swing arm is provided with a guide surface that cooperates with the feed-and-retreat drive wheel. The tensioning wheel swing arm is also provided with a guide surface that cooperates with the feed-and-retreat drive wheel between the guide surfaces provided on the inner sides of the tensioning wheel and the feed-and-retreat pressure wheel swing arm.

[0010] The feed and unload drive pulley is a large feed and unload drive pulley, with a diameter larger than that of the tension pulley.

[0011] The feed belt and tension belt device further includes:

[0012] Basic rocker arm and its control cam;

[0013] The tension wheel rocker arm assembly includes a tension wheel rocker arm, wherein the tension wheel and its rotation drive mechanism are mounted on the tension wheel rocker arm, and the tension wheel rocker arm is connected to the base rocker arm through a first elastic mechanism. The swing of the base rocker arm can drive the tension wheel to a position that engages with the feed belt drive wheel tensioning the belt.

[0014] The feed-and-retreat belt pressure roller swing arm assembly includes a feed-and-retreat belt pressure roller swing arm, wherein the feed-and-retreat belt pressure roller is mounted on the feed-and-retreat belt pressure roller swing arm assembly. The feed-and-retreat belt pressure roller swing arm assembly is connected to the tensioning roller swing arm assembly through a second elastic mechanism. The feed-and-retreat belt pressure roller swing arm swings with the swing of the tensioning roller swing arm. When the tensioning roller is in a position disengaged from the feed-and-retreat belt drive wheel, the feed-and-retreat belt pressure roller is in a position engaged with the feed-and-retreat belt drive wheel. When the tensioning roller is in a position engaged with the feed-and-retreat belt drive wheel, the feed-and-retreat belt pressure roller is in a position disengaged from the feed-and-retreat belt drive wheel.

[0015] The technical solution provided by this utility model has a fast belt feeding speed and provides a larger wrapping angle of the strapping during belt feeding. Furthermore, the tensioning wheel can provide better guiding function, improve the stability and smoothness of belt feeding, meet the requirements of using thin and light strapping, and has a simple structure. A single drive mechanism can complete the position switching of the tensioning wheel and the belt feeding pressure wheel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a front view of an embodiment of the present utility model.

[0018] Figure 3 This is a schematic diagram of a portion of the structure of an embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of an embodiment of the present invention viewed from another angle.

[0020] Figure 5 This is a schematic diagram of a portion of the structure of an embodiment of the present utility model.

[0021] Figure 6 This is a rear view of a portion of the structure of an embodiment of the present utility model.

[0022] Figure 7 This is an exploded view of a portion of the structure of an embodiment of this utility model. Detailed Implementation

[0023] Referring to the accompanying drawings, the feeding and tensioning device for the strapping machine provided by this utility model includes a tensioning wheel 3, a feeding and tensioning pressure wheel 2, and a feeding and tensioning drive wheel 1. The feeding and tensioning pressure wheel 2 and the feeding and tensioning drive wheel 1 cooperate to form a feeding and tensioning wheel assembly, and the tensioning wheel 3 and the feeding and tensioning drive wheel 1 cooperate to form a tensioning wheel assembly. Reference numerals 10 and 30 in the accompanying drawings represent the drive motors for the feeding and tensioning drive wheel 1 and the tensioning wheel 3, respectively. The drive motor 10 for the feeding and tensioning drive wheel 1 is a bidirectional motor. The tensioning wheel 3 and the feeding and tensioning pressure wheel 2 are arranged circumferentially along the feeding and tensioning drive wheel 1. In the feeding and tensioning direction, the tensioning wheel 3 is located downstream of the feeding and tensioning pressure wheel 2. The feeding and tensioning drive wheel 1 is a large feeding and tensioning drive wheel, with a diameter larger than that of the tensioning wheel 3.

[0024] The feed and tension belt device has an upward-sloping top belt channel 91 at the top of the feed and tension belt drive wheel 1, that is, at the 12 o'clock position. The tension wheel 3 is located directly below the feed and tension belt drive wheel 1, that is, at the 6 o'clock position. The feed and tension belt pressure wheel 2 is located on the first side of the feed and tension belt drive wheel 1. The central angle b between the mating point P1 of the feed and tension belt drive wheel 1 and the tangent point P2 of the packing tape at the top of the feed and tension belt drive wheel 1 corresponding to the top belt channel is greater than or equal to 155° and less than or equal to 190°. The central angle a between the mating point P3 of the side of the feed and tension belt drive wheel 1 corresponding to the tangent point P2 is greater than or equal to 60° and less than or equal to 120°.

[0025] The feeding and tensioning belt device has an upward-sloping bottom guide 92 on the second side corresponding to the tensioning wheel. This provides a guide surface for the strapping before it enters the feeding and tensioning wheel, improving the feeding effect.

[0026] The feed belt and tension belt device further includes:

[0027] The basic swing arm 4 and its control cam 40 are provided; a roller 41 that cooperates with the control cam 40 is provided on the basic swing arm, and the control cam 40 is driven to rotate by the core motor 200 of the baling machine. The control cam 40 is provided with a feeding and unfeeding cam surface and a tensioning cam surface along its circumference. The basic swing arm 4 is rotatably mounted on the base 100 via a shaft 42 and is arranged along the front-rear direction of the baling machine core.

[0028] The tension wheel rocker arm assembly includes a tension wheel rocker arm 51, which is rotatably mounted on the base 100 via a first shaft 53 and is arranged substantially along the left-right direction of the packing machine core. The first shaft 53 is perpendicular to the rotation axis of the control cam 40. The tension wheel 3 and its rotation drive mechanism (including a drive motor 30 and a reducer 31) are mounted on the tension wheel rocker arm 51. The tension wheel rocker arm assembly is connected to the base rocker arm 4 via a first elastic mechanism. The swing of the base rocker arm 4 can drive the tension wheel 3 to a position that engages with the feed and unfeed belt drive wheel 1 to tighten the belt.

[0029] The feed and return belt pressure roller swing arm assembly includes a feed and return belt pressure roller swing arm 61, which is rotatably mounted on a base 100 via a second shaft 62 parallel to a first shaft 53. The feed and return belt pressure roller swing arm 61 is arranged around a first side and the upper part of the feed and return belt drive wheel 1, and the inner surface of the feed and return belt pressure roller swing arm 61 is provided as a guide surface 611 that cooperates with the feed and return belt drive wheel 1. The feed and return belt pressure roller 2 is mounted on the feed and return belt pressure roller swing arm 61. The second elastic mechanism and the tensioning wheel swing arm 51 are connected. The feed and retraction belt pressure wheel swing arm 61 swings with the swing of the tensioning wheel swing arm 51. When the tensioning wheel 3 is in the position of being disengaged from the feed and retraction belt drive wheel 1, the feed and retraction belt pressure wheel 2 is in the position of being engaged with the feed and retraction belt drive wheel 1. When the tensioning wheel 3 is in the position of being engaged with the feed and retraction belt drive wheel 1, the feed and retraction belt pressure wheel 2 is in the position of being disengaged from the feed and retraction belt drive wheel 1. It can be disengaged or lightly attached.

[0030] The tension wheel rocker arm 51 is located below the base rocker arm 4. The tension wheel rocker arm assembly also includes a tension wheel rocker arm reset elastic element 52, used to drive the tension wheel 3 downwards to a position disengaged from the feed / retract belt drive wheel 1, while the feed / retract belt pressure wheel rocker arm is located above the base rocker arm 4. The tension wheel rocker arm 51 also has a guide surface 54 that cooperates with the feed / retract belt drive wheel 1 between the guide surface 611 provided on the inner side of the tension wheel 3 and the feed / retract belt pressure wheel rocker arm 61.

[0031] The first elastic mechanism may be an elastic link, including a first vertical link 71 and a first elastic element 72. The lower end of the first vertical link 71 is provided with a first limiting and lifting component 73 for the tension wheel swing arm 51, and the upper end is provided with a second limiting and lifting component 74 corresponding to the base swing arm 4. The first vertical link 71 passes through the end of the tension wheel swing arm 51 and the end of the base swing arm 4. The first elastic element 72 may be a compression spring, sleeved outside the first vertical link 71, and located between the base swing arm 4 and the second limiting and lifting component 74.

[0032] The second elastic mechanism can be a second vertical connecting rod 81 and a second elastic element 82. The upper end of the second vertical connecting rod 81 is provided with an upper limit member 811 and a lower limit member 812. By the downward movement of the second vertical connecting rod 81, the upper limit member 811 drives the feed and return belt pressure roller swing rod 61 to swing, so that the feed and return belt pressure roller enters the position of engaging with the feed and return belt drive wheel 1. By the upward movement of the second vertical connecting rod 81, the lower limit member 812 drives the feed and return belt pressure roller swing rod 61 to swing, so that the feed and return belt pressure roller enters the position of disengaging from the feed and return belt drive wheel 1.

[0033] The second elastic element 82 can be configured as a tension spring, with one end connected to the second vertical connecting rod 81 and the other end connected to the tension wheel swing rod 51.

[0034] As a compact solution that achieves the aforementioned technical effects, the basic swing arm 4 is arranged along the front-rear direction of the packing machine core, located on the second side of the feed / retract belt drive wheel 1. The end of the basic swing arm 4 is located on the back side of the base 100. The main body of the first elastic mechanism and the tension wheel swing arm 51 is located on the back side of the base 100 and cooperates with the basic swing arm 4. The tension wheel 3 is located on the front side of the base 100. The base is provided with a clearance groove 101. The main body of the tension wheel rotation drive mechanism is located on the back side of the base 100 and is connected to the tension wheel 3 through the clearance groove 101. The feed / retract belt pressure wheel swing arm 61 is located on the back side of the base 100. On the front side of the base 100, the feed and retraction belt pressure roller 2 is located on the first side of the feed and retraction belt drive roller 1, and the second elastic mechanism is located on the back side of the base 100. The feed and retraction belt pressure roller swing arm assembly is also provided with a top transverse connecting rod 63. One end of the top transverse connecting rod 63 is connected to the feed and retraction belt pressure roller swing arm 61 located on the front side. The second vertical connecting rod 81 passes through the other end of the top transverse connecting rod 63. The upper limit member 811 and the lower limit member 812 are located above and below the other end of the top transverse connecting rod 63, respectively. The first side and the second side of the feed and retraction belt drive roller 1 are opposite sides of the feed and retraction belt drive roller 1.

[0035] Unless otherwise specified, in this utility model, terms such as "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "axial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0036] Unless otherwise expressly specified and limited, the terms "set," "clamped," and "connected" in this utility model 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 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.

[0037] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

Claims

1. A belt feeding and tensioning device for a baling machine, comprising a tensioning wheel, a belt feeding pressure wheel, and a belt feeding drive wheel, wherein the belt feeding pressure wheel and the belt feeding drive wheel cooperate to form a belt feeding wheel assembly, and the tensioning wheel and the belt feeding drive wheel cooperate to form a tensioning wheel assembly, wherein the belt feeding and tensioning device is provided with a top belt track corresponding to the top of the belt feeding drive wheel, characterized in that, The tensioning wheel is located directly below the feed and return belt drive wheel, and the feed and return belt pressure wheel is located on the first side of the feed and return belt drive wheel, such that the central angle between the mating point of the feed and return belt drive wheel and the tensioning wheel and the tangent point of the packing strap on the top of the feed and return belt drive wheel corresponding to the top belt path is greater than or equal to 155°, and the central angle between the mating point of the side of the feed and return belt drive wheel corresponding to the tangent point and the tangent point is greater than or equal to 60°.

2. The packing machine's feeding and tensioning belt device as described in claim 1, characterized in that, The central angle between the mating point of the feed-retractor drive wheel and the tension wheel and the tangent point of the packing strap on the top of the feed-retractor drive wheel corresponding to the top of the top belt path is less than or equal to 190°, and the central angle between the mating point of the feed-retractor drive wheel side corresponding to the tangent point and the tangent point is less than or equal to 120°.

3. The packing machine's feeding and tensioning belt device as described in claim 1, characterized in that, The feed and tension belt device has an upward-sloping bottom belt track on the second side corresponding to the tensioning wheel.

4. The feeding and tensioning device of the packing machine as described in claim 1, characterized in that, The feed and unload drive wheel is connected to the first bidirectional drive motor and can rotate actively in both directions. The tension wheel and the feed and unload pressure wheel are arranged circumferentially along the feed and unload drive wheel. In the unloading and tensioning direction, the tension wheel is located downstream of the feed and unload pressure wheel.

5. The feeding and tensioning device of the packing machine as described in claim 1, characterized in that, The tensioning wheel and the feed-and-retreat pressure wheel are respectively mounted on the swing arm. The inner side of the feed-and-retreat pressure wheel swing arm is provided with a guide surface that cooperates with the feed-and-retreat drive wheel. The tensioning wheel swing arm is also provided with a guide surface that cooperates with the feed-and-retreat drive wheel between the guide surfaces provided on the inner sides of the tensioning wheel and the feed-and-retreat pressure wheel swing arm.

6. The strapping and tensioning device of the packing machine as described in claim 1, characterized in that, The feed and unload drive pulley is a large feed and unload drive pulley, with a diameter larger than that of the tension pulley.

7. The strapping and tensioning device of the packing machine as described in claim 1, characterized in that, The feed belt and tension belt device further includes: Basic rocker arm and its control cam; The tension wheel rocker arm assembly includes a tension wheel rocker arm, wherein the tension wheel and its rotation drive mechanism are mounted on the tension wheel rocker arm, and the tension wheel rocker arm is connected to the base rocker arm through a first elastic mechanism. The swing of the base rocker arm can drive the tension wheel to a position that engages with the feed belt drive wheel tensioning the belt. The feed-and-retreat belt pressure roller swing arm assembly includes a feed-and-retreat belt pressure roller swing arm, wherein the feed-and-retreat belt pressure roller is mounted on the feed-and-retreat belt pressure roller swing arm assembly. The feed-and-retreat belt pressure roller swing arm assembly is connected to the tensioning roller swing arm assembly through a second elastic mechanism. The feed-and-retreat belt pressure roller swing arm swings with the swing of the tensioning roller swing arm. When the tensioning roller is in a position disengaged from the feed-and-retreat belt drive wheel, the feed-and-retreat belt pressure roller is in a position engaged with the feed-and-retreat belt drive wheel. When the tensioning roller is in a position engaged with the feed-and-retreat belt drive wheel, the feed-and-retreat belt pressure roller is in a position disengaged from the feed-and-retreat belt drive wheel.

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