Film hanging equipment and film hanging method applied to cold stretching film sleeving machine

Abstract

The invention relates to film hanging equipment and a film hanging method applied to a cold stretching film sleeving machine, and relates to the field of film sleeving machines. A support mechanism is arranged at a film inlet of a film sleeving machine, a swing arm mechanism, an unwinding mechanism and a heat sealing mechanism are installed on the support mechanism, and the swing arm mechanism can center a film roll and drive the film roll to swing through a swing arm; the unwinding mechanism is located on one side of the swing arm mechanism and used for stably and continuously releasing the thin film stored on the thin film roll and providing stable thin film supply for subsequent procedures. The heat sealing mechanism is located on one side of the unwinding mechanism and used for heating and fusing the tail of the old film roll and the head of the new film roll. The swing arm mechanism is further provided with a film roll detection mechanism used for detecting whether a film roll needs to be replaced or not. Under the condition, a single person can finish film roll feeding, waste of old films is reduced, a production line does not need to be stopped, the working efficiency is high, and the safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of film covering machines, and in particular to a film covering device and a film covering method applied to a cold stretch film covering machine. Background Art

[0002] At present, in the feed, chemical and other bag palletizing industries, it is very common to place bagged goods in the open air. The existing protective measures mainly adopt two methods: wrapping and hooding. The use of cold stretch film for hooding can provide 5 to 6 sides of rain and snow-proof packaging, ensuring that the goods are not affected by the weather, and also has UV protection. In addition, the cold stretch film has high puncture resistance and can provide whole stack protection for the bag to prevent accidental damage to the bag. The key to cold stretch hooding technology is to successfully convey the film on the film rack, heat seal and cut, open the mold to collect the film, and finally realize stretch hooding, ensuring the continuity and stability of the whole process.

[0003] However, when the existing film machine is about to use up the film roll and needs to replace it with a new film roll, a lot of film is wasted, the replacement process is complicated, the replacement time is long, and it requires the coordination and cooperation of many people, and a lot of film is wasted for early debugging, etc. Moreover, the entire line needs to be stopped and the personnel need to climb up and down to replace it, which causes unnecessary economic losses and also poses a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a film hanging device and a film hanging method applied to a cold stretch hood film machine, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present application provides a film hanging device applied to a cold stretch hooding machine, comprising a support mechanism placed at a film inlet of the hooding machine, wherein the support mechanism is equipped with: A swing arm mechanism, which can center the film roll and drive the film roll to swing through the swing arm; An unwinding mechanism, which is located on one side of the swing arm mechanism and is used to smoothly and continuously release the film stored on the film roll to provide a stable film supply for subsequent processes; A heat-sealing mechanism, which is located on one side of the unwinding mechanism and is used to heat and fuse the tail of the old film roll with the head of the new film roll; Wherein, the swing arm mechanism is also equipped with a film roll detection mechanism for detecting whether the film roll needs to be replaced.

[0006] In a possible implementation, the support mechanism includes: Bracket frame; A push rod motor hinged to the support frame via a push rod round pin; A transformer box for power supply installed on the support frame; A control box mounted on the support frame for controlling the coordinated operation of various mechanisms; and A limit switch installed on the support frame for providing limit protection for the swing arm mechanism; The end of the push rod round pin is also provided with a push rod cotter pin to prevent the push rod round pin from axial movement.

[0007] In a possible implementation, the swing arm is rotatably connected to the support frame via a swing arm bearing seat, and the middle portion of the swing arm is hinged to the push end of the push rod motor via a swing arm round pin; Wherein, a swing arm cotter pin is also installed at the end of the swing arm round pin to prevent the swing arm from axial movement.

[0008] In a possible implementation, the film roll is sleeved on an inflatable shaft, and two ends of the inflatable shaft are rotatably connected to the swing arm through an adjustable part and a rolling part respectively.

[0009] In a possible implementation, the adjustable portion includes: An adjustable side rocker plate and an adjustable side mounting plate mounted on the swing arm; Rotating a screw rod connected between the adjustable side rocker plate and the adjustable side mounting plate; An optical axis installed between the adjustable side rocker plate and the adjustable side mounting plate and parallel to the lead screw; A hand wheel connected to an end of the screw rod away from the air expansion shaft; A slider that translates between the adjustable side rocker plate and the adjustable side mounting plate along the lead screw and the optical axis; A lifting block elastically mounted on the inner side of the slider via a compression spring; An adjusting bearing mounted on the top of the lifting block through a shaft end retaining spring; and Two rolling bearings installed on the adjustable side rocker plate close to the gas expansion shaft through shaft end retaining springs; Among them, the adjusting bearing is in contact with the end of the gas expansion shaft, the two rolling bearings are used to support the gas expansion shaft, a slider sealing plate is provided under the compression spring to prevent its axial movement, the lifting block is provided with a lifting block bushing for reducing damping, and the optical axis is provided with an optical axis bushing for reducing damping.

[0010] In a possible implementation, the rolling portion includes: A rolling side rocker plate and a rolling side mounting plate mounted on the swing arm; and Two parallel D-axes mounted between the rolling side rocker plate and the rolling side mounting plate; Wherein, each of the D shafts is sleeved with a plurality of rolling bearings for supporting the gas expansion shaft, and a D shaft sleeve is provided between the rolling bearing and the D shaft for preventing the rolling bearing from axial movement.

[0011] In a possible implementation, the film roll detection mechanism includes: A detection arm rotatably connected to the swing arm via a detection bearing; a detection rod connected to one end of the detection arm away from the detection bearing; and A nylon wheel connected to the end of the detection rod away from the detection arm through a nylon bearing; Among them, the nylon wheel rolls in contact with the film roll, and the nylon bearing is prevented from moving on the detection rod by a nylon wheel locking plate. A cam is also installed on one side of the detection bearing, and the cam is installed on the detection arm through a cam locking plate. A position sensor corresponding to the position of the cam is installed on the swing arm.

[0012] In a possible implementation, the unwinding mechanism includes: A plurality of rollers for guiding the smooth and continuous release of the film; and A pressing arm is used to press the tail of the old film roll and the head of the new film roll when changing the film.

[0013] In a possible implementation, the heat sealing mechanism includes: A heat-sealed fixing rod installed on the support frame; A cylinder mounted on the support frame; and A heat-sealed movable rod mounted on the push end of the cylinder via a connecting block; Among them, the positions of the heat-sealing fixing rod and the heat-sealing movable rod correspond to each other, and heat-sealing strips are installed on both the heat-sealing fixing rod and the heat-sealing movable rod; a notch is provided on the heat-sealing surface of the heat-sealing strip to facilitate the exhaust of the tail of the old film roll and make it easier for the butt joint part to enter the film-covering machine; a Teflon cloth is attached to the heat-sealing strip to prevent the film from sticking to it.

[0014] In a second aspect, the present application provides a film hanging method applied to a cold stretch hood machine, the method being applicable to the film hanging device applied to the cold stretch hood machine as described above, the method comprising: S1, in response to the control box receiving a film roll replacement signal sent by a position sensor corresponding to a cam of a film roll detection mechanism, controlling the swing arm to rotate to a lower limit position; S2, using compressed air to fix a new film roll with a diameter of less than 1.2 m on the air inflation shaft; S3, adjusting the bearing displacement by turning the hand wheel to center the new film roll on the air expansion shaft; S4, in response to the new film roll being centered, the film roll detection mechanism is lowered so that the nylon wheel is always in contact with the surface of the new film roll, and the replacement status of the new film roll is monitored in real time through the position sensor corresponding to the cam; S5, passing the head of the new film roll and the tail of the old film roll through the multiple rollers of the unwinding mechanism, and fixing the two relatively by a clamping arm; S6. Use the control box to start the heat sealing mechanism, so that the heat sealing movable rod and the heat sealing strip on the heat sealing fixed rod are combined. The heat sealing temperature of the heat sealing strip is 100-120°C, and the heat sealing time is 1-2S. The tail of the old film roll and the head of the new film roll are heated and fused. The notch on the heat sealing surface of the heat sealing strip is convenient for exhausting the tail of the old film roll, making it easier for the butt joint to enter the film covering machine. The Teflon cloth attached to the heat sealing strip prevents the film from sticking to it.

[0015] The beneficial effects brought about by the technical solution provided by the present invention include at least: By setting a support mechanism at the film inlet of the film sleeve machine, a swing arm mechanism, an unwinding mechanism, and a heat-sealing mechanism are installed on the support mechanism. The swing arm mechanism can center the film roll and drive the film roll to swing through the swing arm; the unwinding mechanism is located on one side of the swing arm mechanism, which is used to release the film stored on the film roll smoothly and continuously to provide a stable film supply for subsequent processes; the heat-sealing mechanism is located on one side of the unwinding mechanism, which is used to heat and fuse the tail of the old film roll with the head of the new film roll; wherein, a film roll detection mechanism for detecting whether the film roll needs to be replaced is also installed on the swing arm mechanism. In this case, a single person can complete the film roll renewal, reduce the waste of old film, and do not need to stop the production line, with high work efficiency and strong safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] Figure 1 A front schematic diagram of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0018] Figure 2 A schematic axial view of a support mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 3 A schematic axial view of a swing arm mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 4 A schematic diagram of the axial structure of the adjustable part of the swing arm mechanism of the film hanging device applied to the cold stretch hood machine provided by an exemplary embodiment of the present invention is shown.

[0021] Figure 5 A schematic side sectional structure diagram of an adjustable portion of a swing arm mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0022] Figure 6 A schematic structural diagram of a rolling portion of a swing arm mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0023] Figure 7 A schematic diagram of the axial structure of a film roll detection mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0024] Figure 8 A schematic side sectional structure diagram of a film roll detection mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0025] Fig. 9 A schematic axial view of an unwinding mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0026] Fig.10 A side cross-sectional schematic diagram of an unwinding mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown.

[0027] Fig.11 A schematic axial view of a heat sealing mechanism of a film hanging device applied to a cold stretch hood machine provided by an exemplary embodiment of the present invention is shown.

[0028] In the figure: 1. Bracket mechanism; 101, support frame; 102, push rod round pin; 103, push rod cotter pin; 104, push rod motor; 105, transformer box; 106, limit switch; 107, control box; 2. Swing arm mechanism; 201, swing arm; 202, swing arm round pin; 203, swing arm cotter pin; 204, swing arm bearing seat; 205, gas expansion shaft; 206, film roll; 207, adjustable side rocker; 208, rolling bearing; 209, adjusting bearing; 210, lifting block; 211, screw rod; 212, slider; 213, slider sealing plate; 214, adjustable side mounting plate; 215, hand wheel; 216, lifting block bushing; 217, compression spring; 218, optical axis bushing; 219, optical axis; 220, rolling side rocker; 221, D axis; 222, D axis sleeve; 223, rolling side mounting plate; 3. Detection of film roll mechanism; 301, cam; 302, cam lock plate; 303, detection arm; 304, detection rod; 305, nylon wheel; 306, nylon wheel lock plate; 307, detection bearing; 308, nylon bearing; 4. Unwinding mechanism; 401, film; 402, roller; 403, end fixing plate; 404, front fixing plate; 405, M-axis locking ring; 406, M-axis; 407, clamping support; 408, clamping rod; 409, clamping hand wheel; 410, clamping arm; 411, rotating shaft; 412, clamping block; 413, nylon belt; 414, weight block; 415, lower clamping cross brace; 416, M-axis guide sleeve; 417, tension bearing seat; 418, tension shaft; 419, tension arm; 5. Heat sealing mechanism; 501, heat-sealing fixed rod; 502, heat-sealing strip; 503, heat-sealing movable rod; 504, connecting block; 505, cylinder. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the specification of the present invention, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the direction towards or away from a specific component, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the specification of the present invention, the meaning of "multiple" is two or more.

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 A schematic front view of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown. Figure 2 The figure shows an axial schematic diagram of a support mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention. Figure 3 An axial schematic diagram of a swing arm mechanism of a film hanging device applied to a cold stretch hood machine provided by an exemplary embodiment of the present invention is shown. The film hanging device applied to the cold stretch hood machine comprises a support mechanism 1 placed at the film inlet of the hood machine, and a swing arm mechanism 2, a reeling mechanism 4, and a heat sealing mechanism 5 are installed on the support mechanism 1. The swing arm mechanism 2 can center the film roll 206 and drive the film roll 206 to swing through the swing arm 201; the reeling mechanism 4 is located on one side of the swing arm mechanism 2, and is used to release the film stored on the film roll 206 smoothly and continuously, so as to provide a stable film supply for subsequent processes; the heat sealing mechanism 5 is located on one side of the reeling mechanism 4, and is used to heat and fuse the tail of the old film roll 206 with the head of the new film roll 206; wherein, a film roll detection mechanism 3 for detecting whether the film roll 206 needs to be replaced is also installed on the swing arm mechanism 2.

[0033] In detail, Figure 2 An axial schematic diagram of a support mechanism of a film hanging device applied to a cold stretch hood machine provided by an exemplary embodiment of the present invention is shown, wherein the support mechanism 1 comprises: a support frame 101, a push rod motor 104 hinged to the support frame 101 through a push rod round pin 102, a transformer box 105 for power supply installed on the support frame 101, a control box 107 installed on the support frame 101 for controlling the coordinated work of various mechanisms, and a limit switch 106 installed on the support frame 101 for providing limit protection for the swing arm mechanism 2; wherein the end of the push rod round pin 102 also has a push rod cotter pin 103 for preventing its axial movement.

[0034] In the embodiment of the present application, the support frame 101 is placed in the center of the film inlet of the film machine and fixed on the ground by expansion bolts. The limit switch 106 includes an upper limit switch and a lower limit switch. In addition, the transformer box 105 is electrically connected to the swing arm mechanism 2, the film roll detection mechanism 3, the unwinding mechanism 4, the heat sealing mechanism 5, and the control box 107 to provide power. The swing arm mechanism 2, the film roll detection mechanism 3, the unwinding mechanism 4, and the heat sealing mechanism 5 are all electrically connected to the control box 107 to achieve coordinated work. In one example, the control box 107 includes at least a programmable logic controller PLC.

[0035] Specifically, Figure 3 The axial schematic diagram of the swing arm mechanism of the film hanging device applied to the cold stretch hood film machine provided by an exemplary embodiment of the present invention is shown, the swing arm 201 is rotatably connected to the support frame 101 through the swing arm bearing seat 204, and the middle part of the swing arm 201 is hinged to the push end of the push rod motor 104 through the swing arm round pin 202; wherein, the end of the swing arm round pin 202 is also equipped with a swing arm cotter pin 203 to prevent its axial movement. The film roll 206 is sleeved on the air expansion shaft 205, and the two ends of the air expansion shaft 205 are rotatably connected to the swing arm 201 through the adjustable part and the rolling part respectively.

[0036] In the embodiment of the present application, the middle part of the swing arm 201 is hinged to the joint bearing on the pushing end of the push rod motor 104 through the swing arm round pin 202, that is, the swing arm 201 can complete the lifting of the new film roll 206 through the push rod motor 104.

[0037] In the embodiment of the present application, the air inflation shaft 205 is a device used to fix and tension the film roll in the film shrouding machine. The diameter of the shaft is adjusted by inflation or exhaust, thereby achieving rapid installation and removal of the film roll and ensuring that the film maintains appropriate tension and flatness during the unwinding process.

[0038] Further, Figure 4 The figure shows a schematic diagram of the axial structure of the adjustable part of the swing arm mechanism of the film hanging device applied to the cold stretch hood machine provided by an exemplary embodiment of the present invention. Figure 5A schematic side cross-sectional structure diagram of an adjustable portion of a swing arm mechanism of a film hanging device for a cold stretch hood film machine provided by an exemplary embodiment of the present invention is shown, wherein the adjustable portion comprises: an adjustable side rocker plate 207 and an adjustable side mounting plate 214 mounted on a swing arm 201, a screw rod 211 rotatably connected between the adjustable side rocker plate 207 and the adjustable side mounting plate 214, an optical axis 219 installed between the adjustable side rocker plate 207 and the adjustable side mounting plate 214 and parallel to the screw rod 211, a hand wheel 215 connected to an end of the screw rod 211 away from the air expansion shaft 205, and a hand wheel 215 translating between the adjustable side rocker plate 207 and the adjustable side mounting plate 214 along the screw rod 211 and the optical axis 219. A slider 212, a lifting block 210 elastically installed on the inner side of the slider 212 by a compression spring 217, an adjusting bearing 209 installed on the top of the lifting block 210 by a shaft end retaining spring, and two rolling bearings 208 installed on the adjustable side rocker 207 close to the gas expansion shaft 205 by a shaft end retaining spring; wherein the adjusting bearing 209 contacts the end of the gas expansion shaft 205, the two rolling bearings 208 are used to support the gas expansion shaft 205, a slider sealing plate 213 is provided below the compression spring 217 to prevent the gas expansion shaft 205 from axial movement, a lifting block bushing 216 for reducing damping is sleeved on the lifting block 210, and an optical axis bushing 218 for reducing damping is sleeved on the optical axis 219.

[0039] In the embodiment of the present application, both ends of the screw rod 211 are rotatably connected between the adjustable side rocker plate 207 and the adjustable side mounting plate 214 through bushings. The hand wheel 215 is relatively fixed to the screw rod 211 through key connection, top screw and bolt. Rotating the hand wheel 215 can drive the screw rod 211 to rotate together, and then drive the slider 212 to move through the thread on the screw rod 211. In order to prevent the slider 212 from rotating, an optical axis 219 is provided to provide guidance, so that the slider 212 can slide relative to the optical axis 219.

[0040] In the embodiment of the present application, in order to prevent the inflation shaft 205 from having a rigid collision with the adjustable part, the lifting block 210 is disposed inside the slider 212 .

[0041] In the embodiment of the present application, the lifting block 210 elastically mounted on the inner side of the slider 212 by the compression spring 217 is always in the ejected state, so that the adjusting bearing 209 is in close contact with the end of the air expansion shaft 205, and then when the slider 212 moves, it can drive the air expansion shaft 205 to adjust its position, thereby realizing the centering adjustment of the film roll 206.

[0042] Furthermore, Figure 6A schematic structural diagram of the rolling portion of the swing arm mechanism of a film hanging device applied to a cold stretch hood machine provided by an exemplary embodiment of the present invention is shown, wherein the rolling portion comprises: a rolling side rocker 220 and a rolling side mounting plate 223 mounted on the swing arm 201, and two parallel D shafts 221 mounted between the rolling side rocker 220 and the rolling side mounting plate 223; wherein each D shaft 221 is sleeved with a plurality of rolling bearings 208 for supporting the air expansion shaft 205, and a D shaft sleeve 222 is provided between the rolling bearing 208 and the D shaft 221 for preventing the rolling bearing 208 from axial movement.

[0043] It can be understood that two rolling bearings 208 are also installed on the side of the rolling side rocker plate 220 close to the air shaft 205 through the shaft end retaining spring for auxiliary support.

[0044] In some embodiments, Figure 7 The figure shows a schematic diagram of the axial structure of a film roll detection mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention. Figure 8 A schematic diagram of the side cross-section structure of a film roll detection mechanism of a film hanging device applied to a cold stretch hood film machine provided by an exemplary embodiment of the present invention is shown, wherein the film roll detection mechanism 3 comprises: a detection arm 303 rotatably connected to a swing arm 201 via a detection bearing 307, a detection rod 304 connected to an end of the detection arm 303 away from the detection bearing 307, and a nylon wheel 305 connected to an end of the detection rod 304 away from the detection arm 303 via a nylon bearing 308; wherein the nylon wheel 305 rolls in contact with the film roll 206, the nylon bearing 308 is prevented from moving on the detection rod 304 via a nylon wheel locking plate 306, a cam 301 is further installed on one side of the detection bearing 307, the cam 301 is installed on the detection arm 303 via a cam locking plate 302, and a position sensor corresponding to the position of the cam 301 is installed on the swing arm 201.

[0045] In the embodiment of the present application, the detection rod 304 is installed on the detection arm 303 by using a top screw.

[0046] It should be noted that the film roll detection mechanism 3 relies on its own weight to keep the nylon wheel 305 in close contact with the film roll 206. When the film roll 206 becomes less and less, the cam 301 will rotate accordingly until the position sensor corresponding to the position of the cam 301 installed on the swing arm 201 detects that the position of the cam 301 indicates that the film roll 206 needs to be replaced, and feeds back a signal to the control box 107 that the film roll 206 needs to be replaced.

[0047] It is worth mentioning that Fig. 9 The figure shows an axial side schematic diagram of an unwinding mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention, Fig.10A side cross-sectional schematic diagram of an unwinding mechanism of a film hanging device applied to a cold stretch hood machine provided by an exemplary embodiment of the present invention is shown, and the unwinding mechanism 4 at least includes: a plurality of rollers 402 for guiding the film 401 to be released smoothly and continuously, and a clamping arm 410 for pressing the tail of the old film roll 206 against the head of the new film roll 206 when changing the film.

[0048] Specifically, the end fixing plate 403, the front fixing plate 404, the tension bearing seat 417 and the clamping support 407 of the unwinding mechanism 4 are fixedly mounted on the support frame 101 by bolts, and multiple rollers 402 are fixedly mounted on the end fixing plate 403, the front fixing plate 404 and the tension arm 419 by bolts; the M-axis locking ring 405 and the M-axis guide sleeve 416 are fixedly mounted on the front fixing plate 404 by bolts, and the M-axis 406 passes through the M-axis locking ring 405 and the M-axis guide sleeve 416 to prevent the film 401 from moving left and right. One end of the clamping rod 408 is embedded in the clamping support 407, and the other end is connected to the clamping hand wheel 409 by threading, which is used to operate the clamping arm 410 to press down and contact the film 401 through the clamping block 412; the clamping arm 410 is fixedly mounted on the front fixing plate 404 by the rotating shaft 411, and the lower clamping cross brace 415 is fixedly mounted on the front fixing plate 404 by bolts. The nylon belt 413 is fixed to the clamping arm 410 and the weight block 414 by bolts; the tension shaft 418 passes through the tension bearing seat 417 and is fixed to the tension arm 419 by bolts.

[0049] In the embodiment of the present application, because the finished film is in a roll shape, the film 401 passes through a plurality of rollers 402, so that the film 401 can bend in the opposite direction, thereby offsetting some stress of the finished film.

[0050] More specifically, Fig.11 The axial schematic diagram of a heat sealing mechanism of a film hanging device applied to a cold stretch hooding machine provided by an exemplary embodiment of the present invention is shown, wherein the heat sealing mechanism 5 comprises: a heat sealing fixing rod 501 installed on a support frame 101, a cylinder 505 installed on the support frame 101, and a heat sealing movable rod 503 installed on the pushing end of the cylinder 505 through a connecting block 504; wherein, the heat sealing fixing rod 501 corresponds to the position of the heat sealing movable rod 503, and heat sealing strips 502 are installed on both the heat sealing fixing rod 501 and the heat sealing movable rod 503, and a notch is provided on the heat sealing surface of the heat sealing strip 502 to facilitate the exhaust of the tail of the old film roll 206, to ensure that the head of the new film is firmly and reliably heat-sealed with the tail of the old film, and to make it easier for the butt joint to enter the hooding machine; Teflon cloth is attached to the heat sealing strip 502 to prevent the film from sticking to it.

[0051] Optionally, the number of cylinders 505 is at least 2, and the number of cylinders 505 can be flexibly adjusted according to actual working conditions, which is not limited in the present application.

[0052] Next, a film hanging method applied to a cold stretch hood film hanging device applicable to the cold stretch hood film hanging device involved in the embodiment of the present invention is described, and the method comprises the following steps: S1, in response to the control box receiving a film roll replacement signal from a position sensor corresponding to a cam of a film roll detection mechanism, indicating that the current film roll is used up and needs to be replaced urgently, the swing arm is controlled to rotate to the lower limit position; S2. Insert the air expansion shaft into a new film roll with a diameter of less than 1.2m, roll the film roll to the entrance of the swing arm, and use compressed air to fix the new film roll on the air expansion shaft. The control box rotates the swing arm to the upper limit position. S3. Adjust the bearing displacement by turning the hand wheel to center the new film roll on the air expansion shaft; S4, in response to the new film roll being centered, a weight is placed on the new film roll, and the film roll detection mechanism is lowered by its own weight, so that the nylon wheel is always in contact with the surface of the new film roll, and the replacement status of the new film roll is monitored in real time through the position sensor corresponding to the cam; S5, pass the head of the new film roll and the tail of the old film roll through the multiple rollers of the unwinding mechanism, insert the M shaft into the M end (i.e., the head) of the new film roll to prevent it from moving left and right, and fix the two relatively by the clamping arm; S6. Use the control box to start the heat sealing mechanism, so that the heat sealing movable rod and the heat sealing strip on the heat sealing fixed rod are combined. The heat sealing temperature of the heat sealing strip is 100-120℃, and the heat sealing time is 1-2S. The tail of the old film roll and the head of the new film roll are heated and fused. The notch on the heat sealing surface of the heat sealing strip is convenient for the exhaust of the tail of the old film roll, making it easier for the butt joint part to enter the film machine. The Teflon cloth attached to the heat sealing strip prevents the film from sticking to it. The whole process can be operated by one employee, and a single person can complete the film roll renewal, reducing the waste of old film without stopping the production line. The operation is simple and quick.

[0053] In summary, the present invention sets a support mechanism at the film inlet of the film sleeve machine, and a swing arm mechanism, an unwinding mechanism, and a heat-sealing mechanism are installed on the support mechanism. The swing arm mechanism can center the film roll and drive the film roll to swing through the swing arm; the unwinding mechanism is located on one side of the swing arm mechanism, and is used to release the film stored on the film roll smoothly and continuously, providing a stable film supply for subsequent processes; the heat-sealing mechanism is located on one side of the unwinding mechanism, and is used to heat and fuse the tail of the old film roll with the head of the new film roll; wherein, a film roll detection mechanism for detecting whether the film roll needs to be replaced is also installed on the swing arm mechanism. In this case, a single person can complete the film roll renewal, reduce the waste of old film, and do not need to stop the production line, with high work efficiency and strong safety.

[0054] In the embodiments disclosed in the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A film hanging device applied to a cold stretch hooding machine, comprising a support mechanism (1) placed at a film inlet of the hooding machine, characterized in that: The support mechanism (1) is equipped with: A swing arm mechanism (2) capable of centering the film roll (206) and driving the film roll (206) to swing via the swing arm (201); an unwinding mechanism (4), which is located on one side of the swing arm mechanism (2) and is used to smoothly and continuously release the film stored on the film roll (206) to provide a stable film supply for subsequent processes; A heat-sealing mechanism (5), located on one side of the unwinding mechanism (4), and used to heat and fuse the tail of the old film roll (206) with the head of the new film roll (206); Wherein, a film roll detection mechanism (3) for detecting whether the film roll (206) needs to be replaced is also installed on the swing arm mechanism (2).

2. The film hanging device applied to the cold stretch hood machine according to claim 1, characterized in that: The support mechanism (1) comprises: A support frame (101); A push rod motor (104) hinged to the support frame (101) via a push rod round pin (102); A transformer box (105) for supplying power and mounted on the support frame (101); A control box (107) mounted on the support frame (101) for controlling the coordinated operation of various mechanisms; and A limit switch (106) mounted on the support frame (101) and used for providing limit protection for the swing arm mechanism (2); The end of the push rod round pin (102) also has a push rod cotter pin (103) for preventing the push rod round pin (102) from axial movement.

3. The film hanging device applied to the cold stretch hood film machine according to claim 2 is characterized in that: The swing arm (201) is rotatably connected to the support frame (101) via a swing arm bearing seat (204), and the middle portion of the swing arm (201) is hingedly connected to the pushing end of the push rod motor (104) via a swing arm round pin (202); The end of the swing arm round pin (202) is also provided with a swing arm cotter pin (203) to prevent the swing arm round pin (202) from axial movement.

4. The film hanging device applied to the cold stretch hood machine according to claim 1, characterized in that: The film roll (206) is sleeved on the air-inflating shaft (205), and two ends of the air-inflating shaft (205) are rotatably connected to the swing arm (201) via an adjustable part and a rolling part, respectively.

5. The film hanging device applied to the cold stretch hood machine according to claim 4, characterized in that: The adjustable portion comprises: An adjustable side rocker plate (207) and an adjustable side mounting plate (214) mounted on the swing arm (201); Rotating a screw rod (211) connected between the adjustable side rocker plate (207) and the adjustable side mounting plate (214); An optical axis (219) installed between the adjustable side rocker plate (207) and the adjustable side mounting plate (214) and parallel to the lead screw (211); A hand wheel (215) connected to an end of the screw rod (211) away from the air expansion shaft (205); a sliding block (212) that translates between the adjustable side rocker plate (207) and the adjustable side mounting plate (214) along the lead screw (211) and the optical axis (219); A lifting block (210) elastically mounted on the inner side of the sliding block (212) via a compression spring (217); an adjusting bearing (209) mounted on the top of the lifting block (210) via a shaft end retaining spring; and Two rolling bearings (208) mounted on the adjustable side rocker plate (207) close to the gas expansion shaft (205) via shaft end retaining springs; The adjusting bearing (209) is in contact with the end of the gas expansion shaft (205), the two rolling bearings (208) are used to support the gas expansion shaft (205), a slider sealing plate (213) is provided below the compression spring (217) to prevent the compression spring from axial movement, a lifting block bushing (216) for reducing damping is provided on the lifting block (210), and an optical axis bushing (218) for reducing damping is provided on the optical axis (219).

6. The film hanging device applied to the cold stretch hood machine according to claim 4, characterized in that: The rolling part comprises: A rolling side rocker plate (220) and a rolling side mounting plate (223) mounted on the swing arm (201); and Two parallel D axes (221) mounted between the rolling side rocker plate (220) and the rolling side mounting plate (223); Wherein, each of the D shafts (221) is sleeved with a plurality of rolling bearings (208) for supporting the gas expansion shaft (205), and a D shaft sleeve (222) for preventing axial movement of the rolling bearing (208) is provided between the rolling bearing (208) and the D shaft (221).

7. The film hanging device used for a cold stretch hooding machine according to claim 1, characterized in that: The film roll detection mechanism (3) comprises: A detection arm (303) rotatably connected to the swing arm (201) via a detection bearing (307); a detection rod (304) connected to one end of the detection arm (303) away from the detection bearing (307); and A nylon wheel (305) connected to an end of the detection rod (304) away from the detection arm (303) via a nylon bearing (308); The nylon wheel (305) rolls in contact with the film roll (206), the nylon bearing (308) is prevented from moving on the detection rod (304) through a nylon wheel locking plate (306), a cam (301) is further installed on one side of the detection bearing (307), the cam (301) is installed on the detection arm (303) through a cam locking plate (302), and a position sensor corresponding to the position of the cam (301) is installed on the swing arm (201).

8. The film hanging device applied to the cold stretch hood machine according to claim 1, characterized in that: The unwinding mechanism (4) comprises: A plurality of rollers (402) for guiding the film (401) to be released smoothly and continuously; and A pressing arm (410) is used to press the tail of the old film roll (206) and the head of the new film roll (206) when changing the film.

9. The film hanging device applied to the cold stretch hood machine according to claim 2, characterized in that: The heat sealing mechanism (5) comprises: A heat-sealed fixing rod (501) mounted on the support frame (101); a cylinder (505) mounted on the support frame (101); and A heat-sealing movable rod (503) mounted on the pushing end of the cylinder (505) via a connecting block (504); The heat-sealing fixing rod (501) corresponds to the position of the heat-sealing movable rod (503), and a heat-sealing strip (502) is installed on both the heat-sealing fixing rod (501) and the heat-sealing movable rod (503); a notch is provided on the heat-sealing surface of the heat-sealing strip (502) to facilitate the exhaust of the tail of the old film roll (206) and make it easier for the butt joint part to enter the film-covering machine; a Teflon cloth is attached to the heat-sealing strip (502) to prevent the film from sticking to it.

10. A film hanging method for a cold stretch hood machine, the method being applicable to the film hanging device for a cold stretch hood machine as claimed in any one of claims 1 to 9, characterized in that: The method comprises: S1, in response to the control box receiving a film roll replacement signal sent by a position sensor corresponding to a cam of a film roll detection mechanism, controlling the swing arm to rotate to a lower limit position; S2, using compressed air to fix a new film roll with a diameter of less than 1.2 m on the air inflation shaft; S3, adjusting the bearing displacement by turning the hand wheel to center the new film roll on the air expansion shaft; S4, in response to the new film roll being centered, the film roll detection mechanism is lowered so that the nylon wheel is always in contact with the surface of the new film roll, and the replacement status of the new film roll is monitored in real time through the position sensor corresponding to the cam; S5, passing the head of the new film roll and the tail of the old film roll through the multiple rollers of the unwinding mechanism, and fixing the two relatively by a clamping arm; S6. Use the control box to start the heat sealing mechanism, so that the heat sealing movable rod and the heat sealing strip on the heat sealing fixed rod are combined. The heat sealing temperature of the heat sealing strip is 100-120°C, and the heat sealing time is 1-2S. The tail of the old film roll and the head of the new film roll are heated and fused. The notch on the heat sealing surface of the heat sealing strip is convenient for exhausting the tail of the old film roll, making it easier for the butt joint to enter the film covering machine. The Teflon cloth attached to the heat sealing strip prevents the film from sticking to it.

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