Automatic roll changing winding device and film blowing machine

Abstract

The application relates to the technical field of film winding, in particular to an automatic roll changing and winding device and a film blowing machine, which comprise a machine table and a side plate fixed on the machine table, a rotating rod is rotatably arranged on the side plate, and a guide roller is fixed on the rotating rod; a roll changing mechanism is arranged on the rotating rod and used for bearing a winding roller used for roll changing; symmetrical support plates are connected to the roll changing mechanism; a deflection cutting mechanism is arranged on the support plates; a cutting knife is connected to the deflection cutting mechanism; a follow-up control mechanism connected with the deflection cutting mechanism is arranged on the rotating rod; when the rotating rod rotates, the follow-up control mechanism can adjust the cutting angle of the cutting knife through the deflection cutting mechanism, so that the cut of the film is in an approximately flat state when the film is cut and changed, and the uniformity during subsequent winding is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film winding, in particular to an automatic roll changing and winding device and a film blowing machine. BACKGROUND

[0002] The film blowing machine is the most important one in plastic machinery, which is used for producing plastic film. Its working principle is to melt plastic particles by heating, extrude them into tubular blank through annular die, then blow air into the tubular blank to make it swell, stretch, cool and set, and finally wind it into a film roll.

[0003] In the process of winding the film, it is necessary to ensure that the film is wound into a large roll in a flat, tight and neat manner, and the internal tension is uniform and moderate, so as to avoid quality problems such as wrinkles, wire drawing, violent muscle and edge lifting.

[0004] The existing film winding is operated by a winding machine. When the winding roll on the winding machine reaches the maximum winding amount, the new winding roll is moved to the winding position, the winding roll stops rotating, and the film is cut. After cutting, the film in a suspended state is wound around the new winding roll, and the winding continues. However, this method needs to stop when changing the roll. Since the film blowing machine is in continuous production, the newly produced film will be stacked on each other during the roll changing process, which will cause the film to collapse and deform during subsequent winding.

[0005] To solve this problem, a non-stop winding machine can be used for continuous winding. The winding machine can move the new winding roll to the winding position during roll changing, and cut the film quickly with a cutting knife. Then, the film is directly wound around the new winding roll by its own tension rebound, so as to realize non-stop roll changing and winding. However, since the film is in a pulling and winding state during the whole process, the cut end surface of the film will be inclined during the cutting process. When the most protruding part of the inclined end surface is wound around the winding roll, folding phenomenon will occur, which will cause the film wound on the innermost side of the winding roll to be uneven. As the winding amount increases, the tension will continue to fluctuate during subsequent winding. SUMMARY

[0006] The present application aims to provide an automatic roll changing and winding device and a film blowing machine to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] An automatic roll changing and winding device comprises:

[0009] A machine table and a side plate fixed on the machine table, a rotating rod rotatably installed on the side plate, and a guide roll fixed on the rotating rod;

[0010] Further comprising:

[0011] A support roll changing mechanism is arranged on the rotating rod for carrying the roll changing winding roller, and symmetrical support plates are connected to the support roll changing mechanism;

[0012] A deflection cutting mechanism is arranged on the support plate, and a cutting assembly is connected to the deflection cutting mechanism, and a follow-up control mechanism connected to the deflection cutting mechanism is arranged on the rotating rod;

[0013] The follow-up control mechanism comprises a conical ring which is axially slidably installed on the rotating rod, and a centrifugal assembly connected to the conical ring is installed on the guide roller, and when the rotating speed of the rotating rod changes, the conical ring moves towards or away from the guide roller under the action of the centrifugal assembly;

[0014] The deflection cutting mechanism comprises a deflection guide rail for receiving the cutting assembly and a transmission rod connected to the deflection guide rail, and the transmission rod is rotatably connected to the support plate and the transmission rod is formed with a spiral groove;

[0015] Further comprising an elastic sliding member which can slide in the vertical direction, the elastic sliding member is in abutment with the conical ring and maintains a rolling fit state, the elastic sliding member is sleeved on the transmission rod, and a limiting block formed on the inner side of the elastic sliding member is slidably embedded in the spiral groove.

[0016] As a further scheme of the present application, the support roll changing mechanism comprises rotating discs which are rotatably installed on the rotating rod and are symmetrically arranged, fixed baffles are fixed on the rotating discs, and movable baffles cooperated with the fixed baffles are rotatably installed on the rotating discs.

[0017] As a further scheme of the present application, the support roll changing mechanism further comprises a hollow plate fixed on the rotating disc and fixedly connected with the support plate, a plurality of air jet nozzles equally distributed are communicated on the hollow plate, and a support roller is fixed on the hollow plate.

[0018] As a further scheme of the present application, a circular arc groove is formed on the support plate, and a support column slidably embedded in the circular arc groove is fixed on the deflection guide rail.

[0019] As a further scheme of the present application, the elastic sliding member comprises a guide sleeve and a movable sleeve formed with the limiting block, the guide sleeve and the movable sleeve are fixed by a connecting plate, and a limiting wheel rotatably installed on the connecting plate is in rolling fit with the conical ring;

[0020] The guide sleeve is sleeved on a guide column fixed on the support plate, and the movable sleeve is sleeved on the transmission rod;

[0021] The third spring is sleeved on the transmission rod and the guide column, and the two ends of one of the third springs are respectively abutted against the support plate and the guide sleeve, and the two ends of the other third spring are respectively abutted against the support plate and the movable sleeve.

[0022] As a further scheme of the present application, the centrifugal assembly comprises a plurality of sliding grooves formed at the side end of the guide roller and circumferentially equidistantly distributed, and a sliding block is slidingly installed in the sliding groove.

[0023] As a further scheme of the present application, the sliding block is hingedly connected with a hinge rod hingedly connected with the conical ring, and a second spring is sleeved on the rotating rod, and the two ends of the second spring are respectively abutted against the conical ring and the guide roller.

[0024] As a further scheme of the present application, the machine is provided with a limiting assembly for limiting the position of the winding roller, the limiting assembly comprises a fixed plate fixed on the support, a movable rod is slidingly installed on the fixed plate, a limiting ring and a limiting plate are respectively fixed at the two ends of the movable rod, the limiting ring is abutted against the fixed plate, the limiting plate forms a sliding channel in cooperation with the side plate, and a first spring is sleeved on the movable rod, and the two ends of the first spring are respectively abutted against the fixed plate and the limiting plate.

[0025] A film blowing machine comprising the automatic roll changing and winding device.

[0026] Compared with the prior art, the present application has the beneficial effects that: the present application can guide the new winding roller to the cooperation position with the guide roller through the support roll changing mechanism when the machine is not stopped for roll changing, and after the cutting is completed, the film automatically moves towards the winding roller direction due to the tension rebound, and under the action of the gas blowing of the gas nozzle, the partially overlapped film free suspension section caused by the rebound is blown to be completely opened and wound on the winding roller, so that after the film cutting is completed, the film can be continuously wound by the blowing adhesion method.

[0027] After the roll changing is completed, and when the winding roller is moved, the limiting assembly can provide sufficient downward pressure for the winding roller and keep the provided downward pressure within a constant range, and for this, the limiting plate can automatically give way to prevent interference with the movement of the winding roller when the winding amount of the winding roller gradually increases, and the support force provided for the winding roller is prevented from being too large to affect the normal winding of the film.

[0028] The follow-up regulating mechanism can control the movement of the partial deflection cutting mechanism according to the winding speed, so as to realize the effect of self-adaptive adjustment of the cutting direction of the cutting knife. The cutting knife will cut in an inclined direction with the width direction of the film, that is, the cutting knife will displace in the horizontal transverse direction and the vertical longitudinal direction. In this way, the film can be fully cut, and the distance traveled by the film during the cutting process can be compensated, so as to ensure that the cutting section of the film is relatively flat, so as to ensure that the film is not uneven at the innermost side during the subsequent blowing and winding, and the uneven position may be enlarged during continuous winding, thereby causing the tension of the film to be in a continuous fluctuation state. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Structure schematic diagram of an embodiment of the automatic winding device.

[0030] Figure 2 Structure schematic diagram of another angle of an embodiment of the automatic winding device.

[0031] Figure 3 Structure schematic diagram of a winding state of an embodiment of the automatic winding device.

[0032] Figure 4 Structure schematic diagram of an embodiment of the automatic winding device. Figure 3 Enlarged structure schematic diagram of A in FIG. 6.

[0033] Figure 5 Connection relationship schematic diagram of the guide roller, the supporting winding mechanism, and the partial deflection cutting mechanism in an embodiment of the automatic winding device.

[0034] Figure 6 Structure schematic diagram of the follow-up regulating mechanism and the partial deflection cutting mechanism in an embodiment of the automatic winding device.

[0035] Figure 7 Structure schematic diagram of the partial follow-up regulating mechanism and the partial deflection cutting mechanism in an embodiment of the automatic winding device.

[0036] Figure 8 Exploded structure schematic diagram of the partial deflection cutting mechanism in an embodiment of the automatic winding device.

[0037] Figure 9 Exploded structure schematic diagram of the partial follow-up regulating mechanism in an embodiment of the automatic winding device.

[0038] Figure 10 Exploded structure schematic diagram of the partial supporting winding mechanism and the partial deflection cutting mechanism in an embodiment of the automatic winding device.

[0039] In the figure: 1, machine table; 2, side plate; 201, clamping groove; 3, rotating rod; 4, guide roller; 401, sliding groove; 5, rotating disc; 6, fixed baffle; 7, movable baffle; 8, fixed plate; 9, movable rod; 901, limiting ring; 10, limiting plate; 11, first spring; 12, hollow plate; 13, air jet nozzle; 14, supporting roller; 15, supporting plate; 1501, circular arc groove; 16, transmission rod; 1601, spiral groove; 17, deflection guide rail; 1701, supporting column; 18, cutting knife; 19, sliding block; 20, hinged rod; 21, conical ring; 22, second spring; 23, movable sleeve; 2301, limiting block; 24, guide column; 25, guide sleeve; 26, third spring; 27, limiting wheel; 28, feeding support; 29, air cylinder; 30, connecting plate. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] In addition, the elements in the present application are referred to as "fixed to" or "provided on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0042] Please refer to Figures 1-10 In the embodiments of the present application, an automatic roll changing and winding device comprises:

[0043] A machine table 1 and a side plate 2 fixed on the machine table 1, the side plate 2 being rotatably provided with a rotating rod 3, and the rotating rod 3 being fixed with a guide roller 4;

[0044] Further comprising:

[0045] A supporting roll changing mechanism arranged on the rotating rod 3 and used for bearing a winding roller used for roll changing, the supporting roll changing mechanism being connected with symmetrical supporting plates 15;

[0046] A deflection cutting mechanism arranged on the supporting plate 15, the deflection cutting mechanism being connected with a cutting assembly, and the rotating rod 3 being provided with a follow-up control mechanism connected with the deflection cutting mechanism;

[0047] The follow-up control mechanism comprises a conical ring 21 axially slidingly installed on the rotating rod 3, and the conical ring 21 is connected to a centrifugal assembly installed on the guide roller 4, when the rotating rod 3 changes in rotating speed, the conical ring 21 moves towards or away from the guide roller 4 under the action of the centrifugal assembly;

[0048] The deflection cutting mechanism comprises a deflection guide rail 17 for receiving the cutting assembly and a transmission rod 16 connected to the deflection guide rail 17, the transmission rod 16 is rotationally connected to the support plate 15 and a helical groove 1601 is formed on the transmission rod 16;

[0049] Further comprising an elastic sliding piece capable of sliding in the vertical direction, the elastic sliding piece is in abutment with the conical ring 21 and keeps a rolling fit state, the elastic sliding piece is sleeved on the transmission rod 16 and a limiting block 2301 formed on the inner side of the elastic sliding piece is slidingly embedded in the helical groove 1601.

[0050] A feeding support 28 is rotationally installed on the machine table 1, and a pneumatic cylinder 29 is fixed on the machine table 1 and hinged to the feeding support 28.

[0051] Specifically, the cutting assembly includes a cutting knife 18 sliding along the length direction of the deflection guide rail 17, and an electromagnetic structure integrated in the deflection guide rail 17, which can generate an electromagnetic force to drive the cutting knife 18 to perform a quick cutting action along the radial direction of the deflection guide rail 17. In order to ensure the continuity of production, the film blowing machine needs to change the roll without stopping. For this purpose, when the winding roller on the feeding support 28 reaches the set winding amount, the support roll changing mechanism is moved and the film on the guide roller 4 is pulled. At the same time, the support roll changing mechanism also supports the new winding roller. When the support roll changing mechanism moves to the desired roll changing position, the new winding roller abuts against the guide roller 4 and rotates under the action of friction. At the same time, the guide roller 4 drives the follow-up control mechanism to move. The follow-up control mechanism controls the movement of the deflection cutting mechanism to adjust the cutting angle of the cutting knife 18 according to the rotation speed of the guide roller 4, i.e. the winding speed of the film. At this time, the cutting knife 18 is controlled to move by the deflection cutting mechanism to cut the film. The obliquely moving cutting knife 18 can match the pulling speed of the film, so that the cut film after the cutting knife 18 is in a relatively flat state. After the film is cut, the film in the suspended section is blown by the support roll changing mechanism, so that the film is wrapped around the new winding roller and continuously wound under the action of the winding roller. Under the action of the air cylinder 29, the winding roller on the feeding support 28 is driven to move to the discharging position, so that the winding roller is separated from the feeding support 28. The air cylinder 29 controls the feeding support 28 to reset. At this time, the new winding roller is controlled by the support roll changing mechanism to be connected to the feeding support 28 again, and the above steps are repeated, so as to realize the non-stop roll changing and winding of the film.

[0052] Please refer to Figures 1-6 The support roll changing mechanism includes rotating disks 5 rotatingly installed on the rotating rod 3 and symmetrically arranged, and fixed baffles 6 fixed on the rotating disks 5. The rotating disks 5 are rotatingly installed with movable baffles 7 matched with the fixed baffles 6. The support roll changing mechanism further includes a hollow plate 12 fixed on the rotating disks 5 and fixedly connected with the support plate 15. The hollow plate 12 is connected with a plurality of air nozzles 13 equidistantly distributed thereon. The hollow plate 12 is fixed with a support roller 14.

[0053] Please refer to Figures 3-5The machine table 1 is provided with a limiting assembly for limiting the position of the winding roller, the limiting assembly comprises a fixed plate 8 fixed on the machine table 1, a movable rod 9 is slidingly installed on the fixed plate 8, the two ends of the movable rod 9 are respectively fixed with a limiting ring 901 and a limiting plate 10, the limiting ring 901 is in abutting fit with the fixed plate 8, the limiting plate 10 forms a sliding channel in cooperation with the side plate 2, a first spring 11 is sleeved on the movable rod 9, and the two ends of the first spring 11 are in abutment with the fixed plate 8 and the limiting plate 10 respectively.

[0054] Please refer to Figure 3 In detail, the side plate 2 is formed with a clamping groove 201, the clamping groove 201 is provided in a circular arc recessed shape, and the circular arc size is matched with the rotating shaft of the winding roller, a torsion spring is installed on the rotating shaft of the movable baffle 7, and under the action of the torsion spring, the spacing between the movable baffle 7 and the fixed baffle 6 is smallest, at this time, the support notch matched with the winding roller is formed between the movable baffle 7 and the fixed baffle 6, and the spacing between the extending end of the movable baffle 7 and the center axis of the rotating disc 5 is greater than the spacing between the extending end of the fixed baffle 6 and the center axis of the rotating disc 5.

[0055] Please refer to Figure 3 The limiting plate 10 can be divided into two sections, which are an inclined section and a circular arc section, the inclined section has a certain angle with the corresponding side plate 2 below, and the circular arc radius of the circular arc section is greater than that of the corresponding side plate 2 below, therefore, the sliding channel formed between the limiting plate 10 and the side plate 2 can also be divided into an inclined section and a circular arc section, and the starting point of the sliding channel is on the side of the clamping groove 201, the size of the starting point is smallest and slightly smaller than the size of the rotating shaft of the winding roller, and the size of the sliding channel away from the starting point gradually increases.

[0056] In the initial state, the limiting plate 10 is located at the end of the stroke away from the fixed plate 8, that is, the spacing between the limiting plate 10 and the fixed plate 8 is maximum, so that the limiting ring 901 is in abutting fit with the fixed plate 8, and the elongation of the first spring 11 in the natural state is greater than the maximum spacing between the limiting plate 10 and the fixed plate 8, therefore, the first spring 11 is in a pre-compressed state and always provides a pushing force to the limiting plate 10 in the direction away from the fixed plate 8, under the action of the rotating disc 5, the hollow plate 12 is located at a position slightly below the guide roller 4, therefore, the supporting roller 14 is separated from the film.

[0057] The machine table 1 is provided with two motors, one of which is used to drive the rotating rod 3 to rotate through a belt, and the other is used to drive the rotating disc 5 to rotate through a belt. When it is necessary to change the roll, the rotating disc 5 is controlled to rotate under the action of the motor, thereby driving the fixed baffle 6, the movable baffle 7 and the hollow plate 12 to move. The hollow plate 12 also drives the supporting roller 14 to move, and under the action of the supporting roller 14, the film adhering to the guide roller 4 is pulled to the supporting roller 14. Since the extension amount of the movable baffle 7 is greater than that of the fixed baffle 6, when the fixed baffle 6 passes over the winding roller placed on the clamping groove 201, it will not come into contact with the winding roller. When the movable baffle 7 moves to the position abutting against the winding roller, the winding roller is guided to disengage from the clamping groove 201 and enter the support slot formed between the movable baffle 7 and the fixed baffle 6.

[0058] When the winding roller moves to the position abutting against the limiting plate 10, since the end of the limiting plate 10 is provided in an inclined manner, the limiting plate 10 will give way and move towards the direction away from the side plate 2 to drive the movable rod 9 to move, thereby compressing the first spring 11. Under the action of the first spring 11, the winding roller is always subjected to a certain downward pressure. When the winding roller moves to the vertical center reference surface of the guide roller 4, the rotating disc 5 stops rotating. At this time, the winding roller is tightly adhered to the film on the guide roller 4 and rotates under the action of friction. In this state, the film passes through the adhering positions of the guide roller 4 and the winding roller in turn and is wound by the winding roller placed on the feeding support 28 after passing through the supporting roller 14.

[0059] When the winding roller placed on the feeding support 28 reaches the maximum winding amount, at this time, the film is cut under the action of the deflection cutting mechanism, and at the same time, gas is sent into the hollow plate 12 through the conduit. The gas in the hollow plate 12 will be discharged through the air jet nozzle 13. Since the film is always in a taut state before cutting is completed, after cutting is completed, the film moves towards the winding roller direction due to the tension rebound, and under the action of the gas blown by the air jet nozzle 13, the free suspension section of the film that is partially overlapped due to the rebound is blown to be completely open and is wound on the winding roller. At the same time, since the winding roller is always in a rotating state, the new winding roller will continuously wind the film. In this way, after the film is cut, the film can be continuously wound by the blowing adhesion method.

[0060] At this time, the feeding support 28 is controlled to move away from the guide roller 4 under the action of the air cylinder 29 until the feeding support 28 is separated from the winding roller on which winding is completed, at which time the air cylinder 29 controls the feeding support 28 to reset, in the process, the winding roller in the support notch is in a continuous winding state, at the same time, the rotating disc 5 will rotate and control the winding roller to gradually move towards the feeding support 28 through the support notch, for this, the winding roller will move along the sliding channel, and when the winding roller continuously winds, it will cause the radius of the winding roller to gradually increase, the distance from the winding roller to the rotating center of the guide roller 4 gradually increases, because the opening size of the sliding channel gradually increases, for this, it can ensure that the support force provided by the first spring 11 to the winding roller through the limiting plate 10 always remains within a certain range, in this way, it can not only ensure that the limiting plate 10 can automatically give way to prevent interference with the movement of the winding roller when the winding amount of the winding roller gradually increases, but also prevent the support force provided to the winding roller from being too large to affect the normal winding of the film.

[0061] When the winding roller enters the feeding support 28, the rotating disc 5 continues to rotate, so that the fixed baffle 6 and the movable baffle 7 return to the initial position, in the process, the movable baffle 7 automatically gives way under the action of the torsional spring to ensure that the movable baffle 7 does not interfere with the winding roller.

[0062] Please refer to Figures 1-3 、 Figures 5-8 、 Figure 10 , the elastic sliding piece includes a guide sleeve 25 and a movable sleeve 23 formed with the limiting block 2301, the guide sleeve 25 and the movable sleeve 23 are fixed through a connecting plate 30, the connecting plate 30 is rotatably installed with a limiting wheel 27 that rolls with the tapered ring 21;

[0063] The guide sleeve 25 is sleeved on a guide column 24 fixed on the support plate 15 and can axially slide relative to the guide column 24, the movable sleeve 23 is sleeved on the transmission rod 16;

[0064] The transmission rod 16 and the guide column 24 are respectively sleeved with a third spring 26, two ends of one of the third springs 26 are respectively abutted with the support plate 15 and the guide sleeve 25, and two ends of the other third spring 26 are respectively abutted with the support plate 15 and the movable sleeve 23.

[0065] Please refer to Figures 1-3 、 Figures 5-7 、 Figure 9The centrifugal assembly comprises a plurality of sliding grooves 401 formed at the side ends of the guide roller 4 and distributed at equal intervals in a circle, a sliding block 19 slidingly installed in the sliding groove 401, a hinged rod 20 hinged to the sliding block 19 and hinged to the conical ring 21, and a second spring 22 sleeved on the rotating rod 3 and abutting against the conical ring 21 and the guide roller 4 at two ends.

[0066] It should be noted that when the winding roller placed on the feeding support 28 reaches the maximum winding amount, a new winding roller needs to be guided to perform a winding change action by the fixed baffle 6 and the movable baffle 7, and the film needs to be cut during the winding change;

[0067] Please refer to Figure 6 、 Figure 7 In the initial state, the rotating rod 3 and the guide roller 4 are in a static state, at this time, the sliding block 19 is not subjected to centrifugal force, and the sliding block 19 is located at the end of the stroke of the sliding groove 401 towards the central axis of the rotating rod 3, the sliding block 19 will control the conical ring 21 to be located at the end of the stroke away from the guide roller 4 through the hinged rod 20, and the spacing between the guide roller 4 and the conical ring 21 is maximum, and the elongation of the second spring 22 in the natural state is greater than the maximum spacing between the guide roller 4 and the conical ring 21, and the second spring 22 is in a pre-compressed state and always provides a pushing force to the conical ring 21 away from the guide roller 4;

[0068] Under the action of the connecting plate 30, the spacing between the guide sleeve 25 and the movable sleeve 23 and the support plate 15 is maximum, and the elongation of the third spring 26 in the natural state is greater than the maximum spacing between the guide sleeve 25 and the support plate 15, and the third spring 26 always provides a pushing force to the connecting plate 30 away from the support plate 15 through the guide sleeve 25 and the movable sleeve 23, at this time, the limit wheel 27 abuts against the minimum circumferential radius position of the conical ring 21, and under the action of the movable sleeve 23, the limit block 2301 is located at the end of the stroke on one side of the spiral groove 1601, and under the action of the transmission rod 16, the yaw guide rail 17 and the support roller 14 are in a parallel state, that is, the cutting direction of the cutting knife 18 is the same as the width direction of the film;

[0069] When the film needs to be wound, the rotating rod 3 will control the rotation of the winding roller wound with the film through the guide roller 4, and when the guide roller 4 rotates, a centrifugal force will be generated, under the action of the centrifugal force, the sliding block 19 will slide a corresponding interval along the sliding groove 401 according to the rotating speed of the guide roller 4, the sliding block 19 will drive the conical ring 21 to move towards the guide roller 4 through the hinged rod 20, under the action of the conical ring 21, the connecting plate 30 is controlled to move through the limiting wheel 27, so as to control the sliding of the movable sleeve 23 and the guide sleeve 25 along the axial direction of the transmission rod 16 and the guide column 24 respectively, so as to compress the third spring 26, the movable sleeve 23 will also drive the limiting block 2301 to slide along the spiral groove 1601, under the action of the limiting block 2301 and the spiral groove 1601, the transmission rod 16 rotates, so that the deflection guide rail 17 deflects by a certain angle, the deflection guide rail 17 will also drive the supporting column 1701 to slide along the circular arc groove 1501, the center of the circular arc of the circular arc groove 1501 coincides with the center axis of the transmission rod 16, and the deflection guide rail 17 can be kept stable under the action of the supporting column 1701 and the circular arc groove 1501 when it deflects, and the cutting direction of the cutting knife 18 is changed under the action of the deflection guide rail 17.

[0070] When the cutting direction of the cutting knife 18 changes, the cutting knife 18 will cut at an angle to the width direction of the film under the action of the electromagnet, that is, the cutting knife 18 will displace in the horizontal transverse direction and the vertical direction, so that the film can be cut comprehensively, and the distance traveled by the film during the cutting process can be compensated, so that the cutting surface of the film is relatively flat, so that the film can be blown and changed during the subsequent blowing and changing of the film, and the innermost part of the film is not flat, and the uneven position may be enlarged during continuous winding, so that the tension of the film is in a state of continuous fluctuation.

[0071] If the rotating speed of the guide roller 4 increases, that is, the winding speed increases, the centrifugal force acting on the sliding block 19 will also increase, which will drive the conical ring 21 to move a corresponding distance, so that the limiting wheel 27 moves, and the position of the limiting block 2301 in the spiral groove 1601 will change adaptively, so that the deflection angle of the transmission rod 16 changes, so that the cutting angle of the cutting knife 18 can be adjusted adaptively when the winding speed changes, so that the cutting knife 18 can cut the film more flatly at different winding speeds.

[0072] A film blowing machine comprising the automatic roll changing and winding device.

[0073] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0074] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An automatic roll changing and rewinding device, comprising: The machine base, and the side plate fixed on the machine base, with a rotating rod rotatably mounted on the side plate, and a guide roller fixed on the rotating rod; Its characteristic is that it further includes: A winding change mechanism is provided on the rotating rod to support the take-up roller used for winding change. The winding change mechanism is connected to symmetrically arranged support plates. A swing cutting mechanism is mounted on the support plate, a cutting component is connected to the swing cutting mechanism, and a follow-up control mechanism connected to the swing cutting mechanism is mounted on the rotating rod. The follow-up control mechanism includes a conical ring, which is axially slidably mounted on the rotating rod and connected to a centrifugal assembly mounted on the guide roller. When the rotational speed of the rotating rod changes, the conical ring moves toward or away from the guide roller under the action of the centrifugal assembly. The oscillating cutting mechanism includes an oscillating guide rail for receiving the cutting components and a transmission rod connected to the oscillating guide rail. The transmission rod is rotatably connected to the support plate and has a spiral groove formed on it. It also includes an elastic sliding member that can slide in a vertical direction. The elastic sliding member abuts against the conical ring and maintains a rolling engagement state. The elastic sliding member is sleeved on the transmission rod, and the limiting block formed on the inner side of the elastic sliding member slides and engages with the spiral groove.

2. The automatic roll changing and rewinding device according to claim 1, characterized in that, The support roll changing mechanism includes a rotating disk rotatably mounted on the rotating rod and symmetrically arranged, a fixed baffle fixed on the rotating disk, and a movable baffle that cooperates with the fixed baffle rotatably mounted on the rotating disk.

3. The automatic roll changing and rewinding device according to claim 2, characterized in that, The support roll changing mechanism also includes a hollow plate fixed on the rotating disk and fixedly connected to the support plate. Multiple air nozzles are connected to the hollow plate at equal intervals, and a support roller is fixed on the hollow plate.

4. The automatic roll changing and rewinding device according to claim 1, characterized in that, An arc groove is formed on the support plate, and a support column that slides into the arc groove is fixed on the yaw guide rail.

5. An automatic roll changing and rewinding device according to claim 4, characterized in that, The elastic sliding member includes a guide sleeve and a movable sleeve on which the limiting block is formed. The guide sleeve and the movable sleeve are fixed together by a connecting plate. A limiting wheel that rolls with the conical ring is rotatably mounted on the connecting plate. The guide sleeve is fitted onto the guide post fixed on the support plate, and the movable sleeve is fitted onto the transmission rod; A third spring is respectively fitted on the transmission rod and the guide column. The two ends of one of the third springs abut against the support plate and the guide sleeve, respectively, and the two ends of the other third spring abut against the support plate and the movable sleeve, respectively.

6. An automatic roll changing and rewinding device according to claim 1, characterized in that, The centrifugal assembly includes a plurality of grooves formed on the side end of the guide roller and distributed circumferentially, and a sliding block is slidably installed in the groove.

7. An automatic roll changing and rewinding device according to claim 6, characterized in that, The sliding block is hinged to a hinge rod that is hinged to the conical ring, and a second spring is sleeved on the rotating rod. The two ends of the second spring abut against the conical ring and the guide roller, respectively.

8. An automatic roll changing and rewinding device according to claim 1, characterized in that, The machine base is provided with a limiting component for limiting the position of the take-up roller. The limiting component includes a fixed plate fixed on the machine base, a movable rod slidably mounted on the fixed plate, a limiting ring and a limiting plate respectively fixed at both ends of the movable rod, the limiting ring abutting against the fixed plate, the limiting plate cooperating with the side plate to form a sliding channel, and a first spring sleeved on the movable rod, the two ends of the first spring abutting against the fixed plate and the limiting plate respectively.

9. A blown film machine, characterized in that, Includes the automatic roll changing and rewinding device as described in any one of claims 1-8.

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