A winding mechanism of a strapping packaging machine

Abstract

The utility model discloses a kind of winding mechanisms of bundling packaging machine, including annular frame, winding ring, rotating drive device that can drive winding ring rotation, film unwinding shaft, pressing device, tensioning device, counterweight, reset sensor and control device, annular frame is opened with film roll replacement window;Winding ring is set on annular frame;Counterweight is fixedly installed on winding ring, and counterweight corresponds with the position of film unwinding shaft along the circumference of winding ring, and counterweight exposes the edge of winding ring;Reset sensor is installed on annular frame, and the detection end of reset sensor is towards winding space, when counterweight rotates to the corresponding position of reset sensor, the sensing end of reset sensor is aligned with counterweight.This kind of winding mechanism can keep dynamic balance in the process of fast rotation of winding ring, and when film roll needs to be replaced, film unwinding shaft can also be moved to the position corresponding to film roll replacement window.

Description

Technical Field

[0001] This utility model relates to the field of packaging machines, and in particular to a wrapping mechanism for a strapping packaging machine. Background Technology

[0002] In the packaging industry, rotary strapping machines are widely used for strapping various items due to their efficient rotary packaging method. To achieve continuous packaging and effectively improve efficiency, eliminating the need for manual fixing of the film's starting end to the item each time it is wrapped, some existing packaging machines can pre-define the film's starting end. For example, a strapping packaging machine disclosed on August 12, 2025, with publication number CN223212581U, eliminates the need for manual pulling out and pre-fixing or wrapping the film to the item each time, enabling continuous packaging and effectively improving efficiency. However, when film rolls need to be replaced, the unwinding shaft must be moved to the corresponding film roll replacement window on the ring frame. But due to the large size of the wrapping ring and its high rotation speed during bundling, inertia often causes the rotation distance to exceed the predetermined number of turns. Furthermore, this offset gradually increases with continued use. Therefore, the unwinding shaft often shifts significantly when film rolls need to be replaced. The packaging machine also lacks a device to reset the wrapping ring and move the unwinding shaft to the replacement window, requiring manual alignment, which is prone to hand injuries and inefficient. Additionally, the unwinding shaft, pressing device, and tensioning device are all located on the same side of the wrapping ring, making it difficult for the ring to maintain dynamic balance during rapid rotation, leading to wobbling and potential equipment damage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a winding mechanism for a strapping and packaging machine. This winding mechanism can keep the winding ring dynamically balanced during rapid rotation, and when it is necessary to change the film roll, it can also move the film unwinding shaft to a position corresponding to the film roll changing window.

[0004] To solve the above technical problems, the following technical solution is adopted: A winding mechanism for a strapping and packaging machine includes a ring frame, a winding ring, a rotation drive device capable of driving the winding ring to rotate, a film unwinding shaft, a pressing device, a tensioning device, and a control device. The ring frame has a film roll replacement window. The winding ring is rotatably mounted on the ring frame, and the space enclosed by the winding ring constitutes a winding space. The film unwinding shaft is rotatably mounted on the winding ring. The pressing device and the tensioning device are mounted on the winding ring. The rotation drive device and the control device are respectively mounted on the ring frame, and the signal input terminal of the rotation drive device is electrically connected to the corresponding signal output terminal of the control device. The winding mechanism further includes a counterweight and a reset sensor. The counterweight is fixedly mounted on the winding ring, and its position corresponds to the position of the film unwinding shaft along the circumference of the winding ring, with the counterweight protruding from the edge of the winding ring. The reset sensor is mounted on the ring frame, and its detection end faces the winding space. When the counterweight rotates to the corresponding position of the reset sensor, the sensing end of the reset sensor aligns with the counterweight. The signal output terminal of the reset sensor is electrically connected to the signal input terminal of the control device.

[0005] When the above-mentioned winding mechanism is in use, the packaged items are in the winding space. The rotating drive device drives the winding ring to rotate rapidly, so that the film is pulled out from the film roll on the film unwinding shaft and wound onto the packaged items. During this process, the counterweight can balance the weight on one side of the winding ring, which is equipped with the film unwinding shaft, pressing device and tensioning device on the other side, so that the winding ring maintains dynamic balance during rapid rotation and will not wobble, effectively protecting the equipment. When it is necessary to reset the winding ring and replace the film roll, the operator issues a command to control the winding mechanism to enter the reset operation (usually, the packaging machine has a dedicated reset button for issuing reset commands, which is electrically connected to the signal output terminal of the control device). The rotation drive device drives the winding ring to perform at most one reset rotation. After the counterweight rotates with the winding ring and passes the reset sensor, the reset sensor detects the counterweight and sends a signal to the control device. The control device then controls the rotation drive device to stop. At this time, the film unwinding shaft is exactly at the position of the film roll replacement window (normally, due to the delay caused by signal transmission and the inertia generated by the winding ring during rotation, the counterweight will not be directly opposite the reset sensor when the winding ring stops. Therefore, the position of the reset sensor needs to be set with a certain lead time. However, since the winding ring only rotates at most one rotation during the reset operation, this lead time can be determined through limited experiments). The operator can then replace the film roll. This winding mechanism can maintain the dynamic balance of the winding ring during rapid rotation through the counterweight, avoiding equipment damage. When the film roll needs to be replaced, the counterweight can also act as a detection element, working with the reset sensor to reset the winding ring, so that the film unwinding shaft moves to the position corresponding to the film roll replacement window, thus facilitating the replacement of the film roll.

[0006] The aforementioned control device can be a microcontroller or a microprocessor.

[0007] In a preferred embodiment, the reset sensor is a proximity switch sensor. Other sensors, such as photoelectric switches, can also be used as the reset sensor.

[0008] In a preferred embodiment, the inner or outer circumferential surface of the winding ring is provided with an annular track, and multiple guide wheels are rotatably mounted on the annular frame. Each guide wheel is arranged circumferentially around the winding ring, and the guide wheels are matched with the annular track. The annular frame can limit the winding ring through the cooperation of the guide wheels and the annular track, while ensuring that the winding ring can rotate normally. In the aforementioned inner and outer directions of the winding ring, the direction closer to the winding ring axis is considered inner, and the direction farther from the winding ring axis is considered outer.

[0009] In a further preferred embodiment, the rotation drive device includes a motor, a gear, and a gear ring. The motor is mounted on the ring frame, the gear is mounted on the output shaft of the motor, and the gear ring is disposed on the outer or inner circumferential surface of the winding ring.

[0010] The specific structures of the aforementioned clamping and tensioning devices can all adopt conventional structures, such as the same structures as those in patent CN223212581U.

[0011] The beneficial effects of this invention are as follows: this winding mechanism can maintain dynamic balance during rapid rotation of the winding ring, and when the film roll needs to be replaced, it can also move the film unwinding shaft to a position corresponding to the film roll replacement window. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the winding mechanism in an embodiment of the present invention; Figure 2 This is a schematic diagram of the winding mechanism after the ring frame is removed in an embodiment of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1-2The wrapping mechanism of a strapping and packaging machine shown includes a ring frame 1, a wrapping ring 2, a rotation drive device 3 capable of driving the wrapping ring 2 to rotate, a film unwinding shaft 4, a pressing device 5, a tensioning device 6, a counterweight 7, a reset sensor 8, and a control device (not shown in the figure). The ring frame 1 has a film roll replacement window 101. The wrapping ring 2 is rotatably mounted on the ring frame 1, and the space enclosed by the wrapping ring 2 constitutes a wrapping space 201. The film unwinding shaft 4 is rotatably mounted on the wrapping ring 2. The pressing device 5 and the tensioning device 6 are mounted on the wrapping ring 2. The rotation drive device 3 and the control device are respectively installed on... On the ring frame 1, a counterweight 7 is fixedly installed on the winding ring 2, and the counterweight 7 is positioned circumferentially with the film unwinding shaft 4, with the counterweight 7 protruding from the edge of the winding ring 2; a reset sensor 8 is installed on the ring frame 1, with the detection end of the reset sensor 8 facing the winding space 201. When the counterweight 7 rotates to the corresponding position of the reset sensor 8, the sensing end of the reset sensor 8 is aligned with the counterweight 7; the signal output end of the reset sensor 8 is electrically connected to the signal input end of the control device, and the corresponding signal output end of the control device is electrically connected to the signal input end of the rotation drive device 3.

[0014] When the above-mentioned winding mechanism is in use, the packaged items are in the winding space 201. The rotation drive device 3 drives the winding ring 2 to rotate rapidly, so that the film is pulled out from the film roll on the film unwinding shaft 4 and wound on the packaged items. During this process, the counterweight 7 can balance the weight on one side of the winding ring 2, which is equipped with the film unwinding shaft 4, the pressing device 5 and the tensioning device 6 on the other side, so that the winding ring 2 maintains dynamic balance during rapid rotation and will not shake, effectively protecting the equipment. When it is necessary to reset the winding ring 2 and replace the film roll, the operator issues a command to control the winding mechanism to enter the reset operation (usually, the packaging machine has a dedicated reset button for issuing reset commands, and the reset button is electrically connected to the signal output terminal of the control device). The rotation drive device 3 drives the winding ring 2 to perform at most one reset rotation. After the counterweight 7 rotates with the winding ring 2 and passes the reset sensor 8, the reset sensor 8 detects the counterweight 7 and sends a signal to the control device. The control device controls the rotation drive device 3 to stop driving. At this time, the film unwinding shaft 4 can be exactly at the position of the film roll replacement window 101 (normally, due to the delay caused by signal transmission and the inertia generated by the winding ring 2 when rotating, the counterweight 7 will not be directly opposite the reset sensor 8 when the winding ring 2 stops. Therefore, the position of the reset sensor 8 needs to be set with a certain amount of advance. However, since the winding ring 2 only rotates at most one rotation during the reset operation, this amount of advance can be determined through limited experiments). The operator can then replace the film roll. This winding mechanism can maintain the dynamic balance of the winding ring 2 during rapid rotation through the counterweight 7, avoiding equipment damage. When the film roll needs to be replaced, the counterweight 7 can also act as a detection element, working with the reset sensor 8 to reset and detect the winding ring 2, so that the film unwinding shaft 4 moves to the position corresponding to the film roll replacement window 101, thereby facilitating the replacement of the film roll.

[0015] The aforementioned control device can be a microcontroller or a microprocessor.

[0016] The reset sensor 8 is a proximity switch sensor.

[0017] The inner circumferential surface of the winding ring 2 is provided with an annular track 202. Multiple guide wheels 102 are rotatably mounted on the annular frame 1. Each guide wheel 102 is arranged circumferentially around the winding ring 2 and matches the annular track 202. The annular frame 1 can limit the winding ring 2 through the cooperation of the guide wheels 102 and the annular track 202, while ensuring that the winding ring 2 can rotate normally. In the aforementioned inner and outer directions of the winding ring 2, the direction closer to the axis of the winding ring 2 is considered inner, and the direction farther from the axis of the winding ring 2 is considered outer.

[0018] The rotation drive device 3 includes a motor 301, a gear 302 and a gear ring 303. The motor 301 is mounted on the ring frame 1, the gear 302 is mounted on the output shaft of the motor 301, and the gear ring 303 is disposed on the outer circumferential surface of the winding ring 2.

[0019] The specific structures of the aforementioned clamping device 5 and tensioning device 6 are the same as those in patent CN223212581U.

Claims

1. A winding mechanism for a strapping and packaging machine, comprising a ring frame, a winding ring, a rotation drive device capable of driving the winding ring to rotate, a film unwinding shaft, a pressing device, a tensioning device, and a control device; the ring frame has a film roll replacement window; the winding ring is rotatably mounted on the ring frame, and the space enclosed by the winding ring constitutes a winding space; the film unwinding shaft is rotatably mounted on the winding ring; the pressing device and the tensioning device are mounted on the winding ring; the rotation drive device and the control device are respectively mounted on the ring frame, and the signal input terminal of the rotation drive device is electrically connected to the corresponding signal output terminal of the control device; characterized in that: The winding mechanism further includes a counterweight and a reset sensor. The counterweight is fixedly mounted on the winding ring and corresponds to the position of the film unwinding shaft along the circumference of the winding ring, with the counterweight protruding from the edge of the winding ring. The reset sensor is mounted on the ring frame, with its detection end facing the winding space. When the counterweight rotates to the corresponding position of the reset sensor, the sensing end of the reset sensor aligns with the counterweight. The signal output end of the reset sensor is electrically connected to the signal input end of the control device.

2. The winding mechanism of a strapping and packaging machine as described in claim 1, characterized in that: The reset sensor is a proximity switch sensor.

3. The wrapping mechanism of a strapping packaging machine as described in claim 1, characterized in that: The inner or outer circumferential surface of the winding ring is provided with an annular track, and multiple guide wheels are rotatably provided on the annular frame. Each guide wheel is arranged along the circumference of the winding ring, and the guide wheel matches the annular track.

4. The wrapping mechanism of a strapping and packaging machine as described in claim 3, characterized in that: The rotation drive device includes a motor, a gear, and a gear ring. The motor is mounted on the ring frame, the gear is mounted on the output shaft of the motor, and the gear ring is disposed on the outer or inner circumferential surface of the winding ring.

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