Winding shaft positioning device of four-station plastic film winding machine

Abstract

The invention relates to a coiling shaft positioning device of a four-station plastic film coiling machine. The coiling shaft positioning device comprises a locking device connected with a left turntable, an opening and closing device connected with a right turntable, and a swinging device arranged between a positioning lever and a bearing rotating sleeve, the locking device is used for locking one end of the winding shaft, the middle part of the winding shaft is used for penetrating a paper tube and tensioning the paper tube, and the other end of the winding shaft is rotationally connected with the bearing rotating sleeve; the opening and closing device is used for pressing the bearing rotating sleeve and the right rotating disc at ordinary times and providing power for the bearing rotating sleeve to swing. The swinging device is used for swinging the bearing rotating sleeve around the right rotating disc; the winding device has the beneficial effects that through the arrangement of the swinging device and the opening and closing device, the winding shaft can be swung when a paper tube is loaded or a film roll is unloaded, and the winding shaft can be fixed to the rotating disc when a film is wound.

Description

Technical Field

[0001] The present application relates to the field of winding machines, and in particular to a winding shaft positioning device for a four-station plastic film winding machine. Background Art

[0002] Our company's four-station winder has four winding shafts, which are arranged between two turntables. The four winding shafts are centered on the positioning bar of the turntable and are evenly distributed radially around the positioning bar of the turntable to form four stations. The station is switched every 90° rotation. When unloading film and loading paper tubes, the winding shaft needs to be manually swung to a certain angle, which is inconvenient and inefficient and needs to be solved.

[0003] The existing earlier patent of our company, application number CN201420692506.9, is named as a kind of air-expanding shaft deflation and conveying device; it discloses a motor, a support frame, a synchronous belt, and a deflation device, wherein a driving wheel and a passive wheel are respectively arranged at both ends of the support frame, the motor is fixed to the side of the support frame at one end of which the driving wheel is arranged, the output end of the motor cooperates with the shaft of the driving wheel, the synchronous belt is closed and wound around the upper end face of the support frame after passing through the driving wheel and the passive wheel, the deflation device is fixed to the upper end face of the synchronous belt, the deflation device comprises a bottom plate, a baffle, a deflation cylinder, and a locking cylinder, the bottom plate is fixed to the upper end face of the synchronous belt, the baffle is symmetrically arranged on both sides of the bottom plate, the deflation cylinder is fixed to the upper end face of the bottom plate, the locking cylinder is symmetrically arranged on both sides of the deflation cylinder head, and the two locking cylinders lock the two sides of the air-expanding shaft head. The air-expanding shaft of this scheme cannot swing, which is very inconvenient when threading paper tubes and unloading films;

[0004] There is also an application number of 202023238954.6, named a turntable drive device for a plastic extrusion cast film machine, which discloses that it also includes a support frame 4 fixed on the ground or wall panel 1, a central shaft 7 arranged on the turntable, a first winding motor 5 and a second winding motor 6 fixed on the support frame 4, and a transmission device rotating on the central shaft 7, and the central shaft 7 is located at the center of the turntable. The transmission device includes a rotating sleeve 10 rotatably mounted on the central shaft 7 through a bearing, a first synchronous pulley 9 and a second synchronous pulley 12 fixed on the rotating sleeve 10, and a synchronous pulley group rotatably arranged on the outside of the rotating sleeve 10, the synchronous pulley group includes a third synchronous pulley 11 and a fourth synchronous pulley 14 arranged side by side and a positioning lever cylinder 15 fixedly mounted between the third synchronous pulley 11 and the fourth synchronous pulley 14; the first synchronous pulley 9 and the third synchronous pulley 11 are respectively connected to the first winding motor 5 and the second winding motor 6 through synchronous belts, and the second synchronous pulley 12 and the fourth synchronous pulley 14 are respectively connected to the second winding core shaft 13 and the first winding core shaft 8 through synchronous belts; the power of the winding core shaft is arranged outside the turntable, and cannot rotate with the turntable at multiple stations, which is inconvenient. Summary of the invention

[0005] The purpose of the present invention is to provide a winding shaft positioning device for a four-station plastic film winder, which adopts a mechanical structure and can realize that the winding shaft can swing to a certain angle when unloading film rolls and loading paper tubes, replacing the original manual angle movement and improving efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] The four-station film winding machine is provided with a left turntable, a right turntable and a positioning lever fixedly connected between the center of the left turntable and the center of the right turntable; four winding shaft assemblies are provided between the edges of the left turntable and the right turntable, and the winding shaft assembly includes a winding shaft for threading a paper tube and a bearing sleeve rotatably connected to the winding shaft; a winding shaft positioning device for a four-station plastic film winding machine, comprising a locking device connected to the left turntable, a tensioning device connected to the right turntable and a swinging device provided between the positioning lever and the bearing sleeve; the locking device is used to lock one end of the winding shaft, the middle part of the winding shaft is used to thread the paper tube and tighten the paper tube, and the other end of the winding shaft is rotatably connected to the bearing sleeve; the tensioning device is used to lock the bearing sleeve and the right turntable at normal times, and provide power for the bearing sleeve to swing; the swinging device is used to swing the bearing sleeve around the right turntable.

[0008] Furthermore, the locking device includes a fixed sleeve fixedly connected to the right turntable, a first cylinder fixedly connected to the fixed sleeve, a bearing sleeve connected to the cylinder rod of the first cylinder, and a thrust shaft rotatably connected to the bearing sleeve; the thrust shaft is clamped with the take-up shaft; and the bearing sleeve is slidably connected to the fixed sleeve.

[0009] Furthermore, the thrust shaft is provided with a conical surface; one end of the take-up shaft is inserted into the conical surface; a bearing is provided between the thrust shaft and the bearing sleeve, and a grease nipple for oiling the bearing is provided on the thrust shaft. A first proximity switch for detecting whether the take-up shaft and the thrust shaft are tightly pressed is provided on the left turntable.

[0010] Furthermore, the swing device includes a connecting shaft with one end fixedly connected to the positioning bar, a fixing frame fixedly connected to the other end of the connecting shaft, and a rotating shaft rotatably connected to the fixing frame; the rotating shaft is fixedly connected to the bearing rotating sleeve; the fixing frame is U-shaped, and the two sides of the fixing frame are hinged to the two sides of the bearing rotating sleeve through two rotating shafts.

[0011] Furthermore, the right turntable is provided with four square holes near the edge, and the four square holes are evenly distributed along the center of the right turntable; the square holes correspond to the bearing sleeve; tracks for the swinging of the bearing sleeve are respectively provided on both sides of the square hole, and the tracks include a left track assembly and a right track assembly, and the left track assembly and the right track assembly have the same structure; the right track assembly includes an adjustment block fixedly connected to the right turntable, an adjustment screw threadedly connected to the adjustment block, and a right track abutted against the end of the adjustment screw; after the right track and the left track are adjusted with the adjustment screw, the left track and the right track are respectively fixed on both sides of the right turntable; when the winding shaft is working, the tensioning and closing device locks the bearing sleeve overlapped on the left track and the right track on the right turntable.

[0012] Furthermore, the opening and closing device includes a cylinder connecting seat fixedly connected to the right turntable, a second cylinder hinged to the cylinder connecting seat, and a thrust frame hinged to the cylinder rod of the second cylinder; the thrust frame is fixedly connected to the bearing rotating sleeve, and there are two second cylinders, which are respectively arranged on both sides of the bearing rotating sleeve.

[0013] Furthermore, a limit block is provided on the right turntable to prevent the bearing sleeve from colliding with the inner wall of the square hole when swinging.

[0014] Furthermore, a second proximity switch is provided on the end surface of the square hole; the second proximity switch is used to detect whether the bearing sleeve is in close contact with the track.

[0015] Furthermore, it also includes a balancing device, which is used to balance the tension and pressure applied by the tensioning and closing device to the winding shaft assembly to prevent the winding shaft assembly from having too much inertia when swinging or returning, and preventing the bearing sleeve from colliding with the inner wall of the square hole.

[0016] Furthermore, the balancing device includes a fastening sleeve fixedly connected to the positioning rod, and a third cylinder hinged to the fastening sleeve; the cylinder rod of the third cylinder is hinged to the bearing swivel sleeve.

[0017] The beneficial effects of the present invention are:

[0018] Through the swing device, when the take-up shaft needs to unload the film roll or thread the paper tube, the first cylinder of the locking device is loosened, the thrust shaft is disengaged from one end of the take-up shaft, and the second cylinder of the tensioning and closing device pushes the bearing sleeve to swing around the shaft of the fixed frame on the positioning lever toward the outside of the turntable, and the end of the take-up shaft close to the thrust shaft extends to the outside of the right turntable, which is convenient for unloading the film roll or threading the paper tube; after unloading the film roll or threading the paper tube, the first cylinder of the tensioning and closing device presses the bearing sleeve of the take-up shaft onto the track of the turntable, and locks one end of the take-up shaft with the locking device.

[0019] Through the setting of the balancing device, since the winding shaft is relatively long and one end of the bearing sleeve is relatively heavy because of the motor and bracket that drive the winding shaft to rotate, a lot of force is required when the second cylinder pushes the bearing sleeve, and the third cylinder of the balancing device assists in pushing the bearing sleeve to swing; after the winding shaft has unloaded the film roll or put on the paper tube, it needs to be reset. At this time, the second cylinder contracts. In order to prevent the reset from being too fast and causing a collision, the third cylinder applies a certain resistance to make the bearing sleeve reset slowly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the opening and closing device swinging the winding shaft;

[0022] Figure 3 is a schematic diagram of the structure of the swing device;

[0023] Figure 4 for Figure 3 Sectional view at AA;

[0024] Figure 5 The left side view is a schematic diagram of the structure of the opening and closing device;

[0025] Figure 6 It is a schematic front view of the structure of the opening and closing device;

[0026] Figure 7 is a schematic diagram of the track structure;

[0027] Figure 8 It is a structural schematic diagram of the balancing device;

[0028] Fig. 9 is a schematic diagram of the structure of the locking device;

[0029] Fig.10 This is the installation diagram of the first proximity switch;

[0030] Description of the numbers in the figure:

[0031] 1-left turntable, 2-right turntable, 3-positioning lever, 4-swing device, 5-winding shaft, 6-opening and closing device, 7-bearing swivel sleeve, 8-balancing device;

[0032] 11-fixed sleeve, 12-first cylinder, 13-bearing sleeve, 14-thrust shaft, 15-conical surface, 16-oiling nozzle, 17-first proximity switch;

[0033] 21-adjusting block, 22-right rail, 23-adjusting screw;

[0034] 61-cylinder connecting seat, 62-second cylinder, 63-thrust frame, 64-limiting block, 65-second proximity switch, 66-nylon block;

[0035] 71-fixed frame, 72-rotating shaft, 73-connecting shaft;

[0036] 81 - fastening sleeve, 82 - third cylinder, 83 - second rod end joint bearing, 84 - articulated seat, 85 - first rotating shaft, 86 - rod end joint bearing, 87 - cylinder seat. DETAILED DESCRIPTION

[0037] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0038] Example 1

[0039] The four-station film winding machine is provided with a left turntable 1, a right turntable 2 and a positioning bar 3 fixedly connected between the center of the left turntable 1 and the center of the right turntable 2; four winding shaft assemblies are provided between the edges of the left turntable 1 and the right turntable 2, and the four winding shaft assemblies are evenly distributed on the turntable; the winding shaft assembly includes a winding shaft 5 for threading a paper tube, a transmission shaft fixedly connected to the winding shaft 5 and a bearing rotating sleeve 7 rotatably connected to the transmission shaft; a driving device for driving the transmission shaft to rotate is provided on the bearing rotating sleeve 7, which adopts a reduction motor to drive a synchronous wheel and a synchronous belt; the winding shaft 5 is an air expansion shaft;

[0040] Every time the turntable rotates 90 degrees, the take-up shaft 5 realizes four action cycles of inserting paper tube, rolling film, cutting and unloading film, realizing automatic film rolling; when unloading film, the take-up shaft 5 deflates to facilitate unloading film; when inserting paper tube, the take-up shaft 5 deflates to insert paper tube, and after inserting paper tube, the take-up shaft is inflated to position paper tube;

[0041] like Figure 1 , 2 As shown in Figure 9, a winding shaft positioning device for a four-station plastic film winder includes a locking device connected to the left turntable 1, a tensioning device 6 connected to the right turntable 2, and a swinging device 4 arranged between the positioning lever 3 and the bearing sleeve 7; the locking device is used to lock one end of the winding shaft 5, the middle part of the winding shaft 5 is used to pass the paper tube and tighten the paper tube, and the other end of the winding shaft 5 is fixed to the transmission shaft to achieve rotational connection with the bearing sleeve 7; the tensioning device 6 is used to lock the bearing sleeve 7 and the right turntable 2 at normal times, and provide power for the bearing sleeve 7 to swing; the swinging device 4 is used to swing the bearing sleeve 7 around the right turntable 2.

[0042] When the film is rolled or cut, one end of the winding shaft 5 is held by the locking device, and the other end is driven to rotate by the driving device installed on the bearing sleeve 7. The bearing sleeve 7 is fixed to the right turntable 2 by the opening and closing device 6. When the film needs to be unloaded or the paper tube needs to be threaded, the opening and closing device 6 pushes the bearing sleeve 7 to swing around the positioning lever 3 through the swinging device 4, so that the winding shaft 5 swings at a certain angle.

[0043] like Fig. 9 As shown, the locking device includes a fixing sleeve 11 fixedly connected to the left turntable 1, a first cylinder 12 fixedly connected to the fixing sleeve 11, a bearing sleeve 13 connected to the cylinder rod of the first cylinder 12, and a thrust shaft 14 rotatably connected to the bearing sleeve 13; the thrust shaft 14 is clamped with the take-up shaft 5; and the bearing sleeve 13 is slidably connected to the fixing sleeve 11.

[0044] The thrust shaft 14 is provided with a conical surface 15; one end of the winding shaft 5 is inserted into the conical surface 15; the conical surface 15 is provided so that when the winding shaft 5 is inserted into the thrust shaft 14, no special centering device is required;

[0045] A bearing is provided between the thrust shaft 14 and the bearing sleeve 13 to realize the rotation of the winding shaft 5 and avoid jamming;

[0046] The thrust shaft 14 is provided with a grease nipple 16 for oiling the bearing, which facilitates oiling the bearing.

[0047] A proximity switch bracket is provided on the left turntable 1, and a first proximity switch 17 for detecting whether the take-up shaft 5 and the thrust shaft 14 are pressed tightly is provided on the proximity switch bracket.

[0048] When it is necessary to unload the film or thread the paper tube, the first cylinder 12 contracts, driving the thrust shaft 14 to separate from one end of the winding shaft 5, so as to facilitate the opening of the winding shaft 5;

[0049] like Figure 3 , 4 As shown, in order for the winding shaft 5 to swing, a fulcrum is required, and the structure of the fulcrum is defined as a swing device 4, which is arranged between the positioning lever 3 and the bearing rotating sleeve 7.

[0050] The swing device 4 includes a connecting shaft 73 fixedly connected to the positioning lever 3, a fixing frame 71 fixedly connected to the other end of the connecting shaft 73, and a rotating shaft 72 rotatably connected to the fixing frame 71; the rotating shaft 72 is fixedly connected to the bearing rotating sleeve 7; the fixing frame 71 is U-shaped, and the two sides of the fixing frame 71 are hinged to the two sides of the bearing rotating sleeve 7 through two rotating shafts 72.

[0051] The detailed structure is that a circular hole is provided on the fixing frame 71, and the connecting shaft 73 is inserted into the circular hole. A slot is provided on the side wall of the circular hole, and the two sides of the slot are locked by bolts, thereby locking the connecting shaft 73 in the circular hole.

[0052] Through holes are provided near the ends of the two side walls on the fixing frame 71, and one end of the rotating shaft 72 is inserted into the through holes. An open groove is provided near the end of the side wall, which is connected with one side of the through hole. One end of the rotating shaft 72 is fixed by locking the side wall of the open groove with bolts, and the other end of the rotating shaft 72 rotates through the bearing and the two sides of the bearing rotating sleeve 7; the bearing rotating sleeve 7 with two rotating shafts 72 is more stable during operation.

[0053] The right turntable 2 is provided with four square holes near the edge, and the four square holes are evenly distributed along the center of the right turntable 2; the cross section of the bearing sleeve 7 is square, and the square holes correspond to the bearing sleeve 7; each square hole corresponds to a set of winding shaft assembly;

[0054] like Figure 7 As shown, tracks for the swinging of the bearing sleeve 7 are respectively provided on both sides of the square hole, and the tracks include a left track assembly and a right track assembly, and the left track assembly and the right track assembly have the same structure; the right track assembly includes an adjustment block 21 fixedly connected to the right turntable 2, an adjustment screw 23 threadedly connected to the adjustment block 21, and a right track 22 abutting against the end of the adjustment screw 23; after the right track 22 and the left track are placed in the same plane by the adjustment screw 23, the left track and the right track 22 are respectively fixed on both sides of the right turntable 2; when the winding shaft 5 is working, the opening and closing device 6 locks the bearing sleeve 7 overlapped on the left track and the right track 22 on the track of the right turntable 2, and when the winding shaft 5 needs to swing, one side of the bearing sleeve 7 slides on the track.

[0055] like Figure 5 As shown in FIG. 6 , the opening and closing device 6 comprises a cylinder connection seat 61 fixedly connected to the right turntable 2, a second cylinder 62 hinged to the cylinder connection seat 61, and a thrust frame 63 hinged to the cylinder rod of the second cylinder 62; the thrust frame 63 is fixedly connected to the bearing rotating sleeve 7, and there are two second cylinders 62, which are respectively arranged on both sides of the bearing rotating sleeve 7. The two cylinders 62 are more balanced and stable when pushing the reel assembly;

[0056] A nylon block 66 is fixed on the thrust frame 63; a limit block 64 is provided on the right turntable 2 to prevent the bearing sleeve 7 from colliding with the inner wall of the square hole when swinging; the installation of the limit block 64 is to avoid the nylon block 66 from contacting the limit block 64 when the winding shaft 5 swings, to avoid the bearing sleeve 7 from colliding with the inner wall of the square hole and causing damage; the nylon block 66 is relatively soft to avoid damaging the limit block 64.

[0057] The hard limit block 64 is used to make the nylon block 66 on the thrust frame 63 contact the limit block 64 when the winding shaft 5 is opened, and also to prevent the winding shaft 5 from continuing to open after opening to a set angle due to excessive air pressure;

[0058] The end surface of the square hole is provided with a second proximity switch 65; the second proximity switch 65 is used to detect whether the winding shaft 5 is in the working position.

[0059] The second proximity switch 65 detects whether the winding shaft 5 returns to the working position after the paper tube is inserted or the film roll is unloaded. After the detection, the first cylinder 12 pneumatically locks the winding shaft 5. Figure 1 As shown, the working position refers to the situation where the bearing sleeve 7 of the winding shaft 5 is pressed against the side wall of the square hole; after the second proximity switch 65 detects that the winding shaft 5 returns to the working position, the controller gives a signal to the first cylinder 12, and the thrust shaft 14 is pressed against the winding shaft 5.

[0060] The film roll machine of the present application is provided with a controller, and each proximity switch signal and cylinder signal of the present application are connected to the controller, so as to facilitate the control of each proximity switch and cylinder.

[0061] The working process of the present invention,

[0062] When it is necessary to unload the film or load the paper tube, the winding shaft 5 rotates to the designated position along with the turntable, the locking device is released, the first cylinder 12 drives the thrust shaft 14 to withdraw, and the thrust shaft 14 is disengaged from the winding shaft 15;

[0063] Start the second cylinder 62, the cylinder rod of the second cylinder 62 extends, and pushes the bearing rotating sleeve 7 to rotate around the rotating shaft 72 to a certain angle through the thrust frame 63, which is 8 degrees in this application; in this way, one end of the winding shaft 5 leaves the left turntable 1, which is convenient for unloading the film roll or threading the paper tube;

[0064] After the film roll is unloaded, the cylinder rod of the second cylinder 62 retracts, driving the thrust frame 63 to reset the bearing rotating sleeve 7 and press it on the track to carry out the film rolling or film cutting process.

[0065] Example 2

[0066] The structure of this embodiment is basically the same as that of embodiment 1.

[0067] The difference is that

[0068] It is found in use that when the two second cylinders 62 push the bearing swivel sleeve 7 to swing, the start-up is slow in the initial stage, and when it needs to stop, it causes a collision due to inertia, so it is necessary to add a balancing device to overcome these defects.

[0069] like Figure 8 As shown, the present application also includes a balancing device 8, which is used to balance the thrust and pressure applied by the tensioning device 6 to the winding shaft assembly to prevent the winding shaft assembly from having too much inertia when swinging or returning, and the bearing sleeve 7 from colliding with the inner wall of the square hole. There are four sets of balancing devices 8, and the four sets of balancing devices correspond to the four winding shafts 5.

[0070] The balancing device 8 comprises a fastening sleeve 81 fixedly connected to the positioning lever 3, and a third cylinder 82 hinged to the fastening sleeve 81; the cylinder rod of the third cylinder 82 is hinged to the bearing swivel sleeve 7. The cylinder diameter of the third cylinder 82 is smaller than the cylinder diameter of the second cylinder 62, that is, the force of the third cylinder 82 is smaller than the force of the second cylinder 62;

[0071] When the second cylinder 62 pushes the bearing sleeve 7 to swing, in the initial stage, since the reel assembly is relatively heavy, the bearing sleeve 7 slides on the track of the square hole and the resistance is relatively large, and the third cylinder 82 also assists in pushing the bearing sleeve 7 to swing into place as quickly as possible; when the bearing sleeve 7 is reset, the second cylinder 62 contracts. In order to prevent the bearing sleeve 7 from colliding with the square hole under the action of inertia, the third cylinder 82 applies a certain resistance to slowly reset the bearing sleeve 7.

[0072] Example 3

[0073] The structure of this embodiment is basically the same as that of embodiment 2.

[0074] The difference is that

[0075] like Figure 8 As shown, the scheme of the balancing device 8 is refined;

[0076] The fastening sleeve 81 is a two-half-circular ring structure, which is sleeved on the positioning lever 3 by bolts. A first rotating shaft 85 is fixed on the fastening sleeve 81. The tail of the third cylinder 82 is threadedly connected to a cylinder seat 87. The cylinder seat 87 is threadedly connected to a rod end joint bearing 86. The bearing of the rod end joint bearing 86 cooperates with the first rotating shaft 85 to realize the hinged connection of the tail of the third cylinder 82.

[0077] A second rod end joint bearing 83 is threadedly connected to the cylinder rod of the third cylinder 82 , and an articulated seat 84 is fixed to the bearing rotating sleeve 7 by bolts; the articulated seat 84 is articulated with the second joint bearing 83 via a second rotating shaft.

[0078] By means of the two rod end joint bearings, the third cylinder 82 can be hinged between the bearing rotating sleeve 7 and the fastening sleeve 81 to avoid the cylinder being stuck when the bearing rotating sleeve 7 is swinging, thereby limiting the swinging of the bearing rotating sleeve 7 .

[0079] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0081] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A winding shaft positioning device for a four-station plastic film winding machine, wherein the four-station film winding machine is provided with a left turntable (1), a right turntable (2) and a positioning lever (3) fixedly connected between the center of the left turntable (1) and the center of the right turntable (2); four winding shaft assemblies are provided between the edges of the left turntable (1) and the right turntable (2), and the winding shaft assembly includes a winding shaft (5) for threading a paper tube and a bearing rotating sleeve (7) rotatably connected to the winding shaft (5); characterized in that: The invention comprises a locking device connected to the left turntable (1), an opening and closing device (6) connected to the right turntable (2), and a swinging device (4) arranged between a positioning lever (3) and a bearing rotating sleeve (7); the locking device is used to lock one end of a winding shaft (5); the middle part of the winding shaft (5) is used to pass a paper tube and tighten the paper tube; the other end of the winding shaft (5) is rotatably connected to the bearing rotating sleeve (7) through a transmission shaft; the opening and closing device (6) is used to lock the bearing rotating sleeve (7) and the right turntable (2) at normal times and provide power for the bearing rotating sleeve (7) to swing; the swinging device (4) is used to swing the bearing rotating sleeve (7) around the right turntable (2).

2. The winding shaft positioning device of the four-station plastic film winding machine according to claim 1 is characterized in that: The locking device comprises a fixing sleeve (11) fixedly connected to the left turntable (1), a first cylinder (12) fixedly connected to the fixing sleeve (11), a bearing sleeve (13) connected to the cylinder rod of the first cylinder (12), and a thrust shaft (14) rotatably connected to the bearing sleeve (13); the thrust shaft (14) is clamped with the winding shaft (5); and the bearing sleeve (13) is slidably connected to the fixing sleeve (11).

3. The winding shaft positioning device of the four-station plastic film winding machine according to claim 2 is characterized in that: The thrust shaft (14) is provided with a conical surface (15); one end of the winding shaft (5) is inserted into the conical surface (15); a bearing is provided between the thrust shaft (14) and the bearing sleeve (13); and a grease nipple (16) for oiling the bearing is provided on the thrust shaft (14); The left turntable (1) is provided with a first proximity switch (17) for detecting whether the reeling shaft (5) and the thrust shaft (14) are tightly pressed together.

4. The winding shaft positioning device of the four-station plastic film winding machine according to claim 1 is characterized in that: The swing device (4) comprises a connecting shaft (73) fixedly connected to the positioning lever (3), a fixing frame (71) fixedly connected to the other end of the connecting shaft (73), and a rotating shaft (72) rotatably connected to the fixing frame (71); the rotating shaft (72) is fixedly connected to the bearing rotating sleeve (7); the fixing frame (71) is U-shaped, and two sides of the fixing frame (71) are hinged to two sides of the bearing rotating sleeve (7) via two rotating shafts (72).

5. The winding shaft positioning device of the four-station plastic film winding machine according to claim 4 is characterized in that: The right turntable (2) is provided with four square holes near the edge, and the four square holes are evenly distributed along the center of the right turntable (2); the square holes correspond to the bearing sleeve (7); tracks for the swinging of the bearing sleeve (7) are respectively provided on both sides of the square holes, and the tracks include a left track assembly and a right track assembly, and the left track assembly and the right track assembly have the same structure; the right track assembly includes an adjustment block (21) fixedly connected to the right turntable (2), an adjustment screw (23) threadedly connected to the adjustment block (21), and a right track (22) abutted against the end of the adjustment screw (23); after the right track (22) and the left track are adjusted by the adjustment screw (23), the left track and the right track (22) are respectively fixed to the two sides of the right turntable (2); when the winding shaft (5) is working, the opening and closing device (6) locks the bearing sleeve (7) overlapped on the left track and the right track (22) on the right turntable (2).

6. The winding shaft positioning device of the four-station plastic film winding machine according to claim 5 is characterized in that: The opening and closing device (6) comprises a cylinder connecting seat (61) fixedly connected to the right turntable (2), a second cylinder (62) hinged to the cylinder connecting seat (61), and a thrust frame (63) hinged to the cylinder rod of the second cylinder (62); the thrust frame (63) is fixedly connected to the bearing rotating sleeve (7), and the second cylinder (62) is two, which are respectively arranged on both sides of the bearing rotating sleeve (7).

7. The winding shaft positioning device of the four-station plastic film winding machine according to claim 6 is characterized in that: The thrust frame (63) is provided with a shock-absorbing nylon block (66), and the right turntable (2) is provided with a limit block (64) for preventing the bearing rotating sleeve (7) from colliding with the inner wall of the square hole when swinging.

8. The winding shaft positioning device of the four-station plastic film winding machine according to claim 5 is characterized in that: The end surface of the square hole is provided with a second proximity switch (65); the second proximity switch (65) is used to detect whether the winding shaft (5) returns to the working position after passing through the paper tube or unloading the film roll.

9. The winding shaft positioning device of the four-station plastic film winding machine according to claim 1 is characterized in that: It also includes a balancing device (8), which is used to balance the tension and pressure applied by the tensioning and closing device (6) to the winding shaft assembly, so as to prevent the inertia of the winding shaft assembly from being too large when swinging or returning, and to prevent the bearing sleeve (7) from colliding with the inner wall of the square hole.

10. The winding shaft positioning device of the four-station plastic film winding machine according to claim 9, characterized in that: The balancing device (8) comprises a fastening sleeve (81) fixedly connected to the positioning lever (3), and a third cylinder (82) hinged to the fastening sleeve (81); the cylinder rod of the third cylinder (82) is hinged to the bearing rotating sleeve (7).

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