Limiting device for film blowing machine

Abstract

The utility model relates to the field of blown film rolling, in particular to a limiting device for a film blowing machine, and aims to solve the problems that in the prior art, an effective limiting device is lacked, a film is prone to deviation and wrinkling, and the product quality and the production efficiency are affected. A limiting assembly is arranged on the working frame, the limiting assembly is located over the film blowing machine, and the limiting assembly is used for limiting blowing; a shrinkage assembly is arranged on the side, away from the film blowing machine, of the limiting assembly, installed on the working frame and used for controlling the width of the finished film. The film winding device has the effect of improving the film winding quality.

Description

Technical Field

[0001] The present application relates to the field of film blowing and winding, and in particular to a limiting device for a film blowing machine. Background Art

[0002] Plastic film has replaced most paper packaging as packaging. The film is usually formed by flat extrusion blowing. The plastic raw material is extruded by the film blowing machine to form a film tube, and then the film tube is inflated by compressed air to expand to a specified diameter. After cooling, the film tube is clamped flat by the winder to form a fitted film, and finally wound on the winder's winding roller.

[0003] However, the prior art lacks an effective limiting device before the film tube is rolled up, which may easily lead to problems such as film deviation and wrinkles, affecting product quality and production efficiency, so there is room for improvement. Utility Model Content

[0004] In order to improve the quality of film winding, the present application provides a limiting device for a film blowing machine.

[0005] The present application provides a limiting device for a film blowing machine using the following technical solution:

[0006] A limiting device for a film blowing machine comprises the film blowing machine, wherein a working frame is installed around the film blowing machine, a limiting component is arranged on the working frame, the limiting component is located directly above the film blowing machine, and the limiting component is used to limit the inflation; a shrinking component is arranged on the side of the limiting component away from the film blowing machine, the shrinking component is installed on the working frame, and the shrinking component is used to control the width of the finished film.

[0007] By adopting the above technical solution, the operator adjusts the limit assembly and the shrink assembly according to the size of the film to be produced, so that the limit assembly and the shrink assembly are adapted to the film tube. The extrusion die head of the film blowing machine extrudes the film tube and then blows it up. Under the pulling force of the winder, the inflated film tube moves upward. If the film tube is blown beyond the designed diameter, the outer wall of the film tube contacts the limit assembly. Since the film tube has not yet solidified at this time, the flexible contact between the limit assembly and the film tube can limit the continued expansion of the film tube without damaging the film tube. Subsequently, the film tube enters the shrink assembly under the pulling force of the winder, and the shrink assembly gradually compresses the expanded film tube. During this process, the film tube gradually solidifies and enters the winder for winding, and finally a film roll that meets the designed width is obtained. The limit assembly first limits the degree of inflation, and then the shrink assembly controls the width of the film, which is convenient for the winder to wind up and improves the quality and efficiency of winding up.

[0008] Optionally, the limiting assembly includes a mounting frame, an elastic mounting member and a limiting member, the mounting frame is sleeved on the outside of the film tube, the elastic mounting member is installed on the inner side of the mounting bracket, one end of the elastic mounting member is connected to the mounting frame, and the other end is connected to the limiting member; a total of multiple limiting members are arranged on the mounting frame, and multiple limiting members are all arranged toward the film tube, and multiple limiting members are arranged along the circumference of the film tube to limit the expansion range of the film tube.

[0009] Optionally, the mounting frame includes two annular brackets and a plurality of vertical rods, the two annular brackets are arranged in a vertical direction, and the plurality of vertical rods are vertically installed between the two annular brackets; an elastic mounting piece is arranged on each of the vertical rods; the elastic mounting piece includes two torsion springs and two torsion bars, the two torsion springs are respectively arranged at the two ends of the vertical rod in the length direction, and the torsion bar is rotatably connected to the vertical rod through the torsion spring; the torsion bar rotates in a horizontal plane with the torsion spring as the axis, and the length of the torsion bar is smaller than the radius of the annular bracket; the torsion spring controls the rotation range of the torsion bar; a rotating shaft is installed at the end of the torsion bar away from the torsion spring, and the torsion bar is connected to a limit piece through the rotating shaft.

[0010] Optionally, the limiting member includes a limiting rod, a plurality of limiting plates and a plurality of limiting shafts, the two ends of the limiting rod in the length direction are connected to two torsion bars on the same vertical rod through a rotating shaft, and the plurality of limiting plates are evenly arranged along the length direction of the limiting rod; the limiting shaft is horizontally arranged, and the limiting shaft is installed on the side wall of the limiting plate away from the annular bracket, the limiting shaft is rotatably connected to the limiting plate, and the outer peripheral wall of the limiting shaft can contact the outer wall of the film tube, and the contact between the limiting shaft and the film tube is point contact.

[0011] By adopting the above technical solution, the operator adjusts the moving range of the limit rod by adjusting the torsion spring, so that the diameter of the circle surrounded by all the limit rods in the free state is adapted to the diameter of the film tube after inflation. If the inflation of the film tube is within the set range, the film tube just does not contact the limit shaft. If the expansion of the film tube slightly exceeds the limit range of the limit rod, the outer wall of the film tube contacts the outer walls of multiple limit shafts, and the length direction of the limit shaft is in the tangent direction of the contact point with the film tube. The limit shaft is pushed outward by the film tube, and the thrust is transmitted to the torsion spring through the limit rod and the torsion rod. The torsion spring is compressed to make the torsion rod drive the limit rod to move away from the film tube, and the diameter of the circle surrounded by all the limit rods increases; under the action of the rotating shaft, the limit rod drives the limit shaft to rotate, so that the limit shaft is in the tangent direction of the contact point with the film tube. At this time, the film tube has not yet solidified, and the film tube undergoes slight elastic deformation at the contact point, and the limit shaft limits the further expansion of the film tube. During this process, the film tube moves upward under the pulling force of the winder, and the limit shaft rolls when in contact with the film tube. The friction between the limit shaft and the film tube is a small static friction force, which reduces the possibility of damage to the film tube by the limit shaft while limiting excessive expansion of the film tube.

[0012] Optionally, the shrinking assembly includes two first shrinking parts, the two first shrinking parts are fixedly arranged on a working frame, the first shrinking part includes a fixed frame and a plurality of shrinking rollers, the fixed frame is installed on the working frame, the plurality of shrinking rollers are arranged along the length direction of the fixed frame, the shrinking rollers are horizontally arranged, the two ends of the shrinking rollers in the length direction are rotatably connected to the fixed frame, and the outer circumferential wall of the shrinking roller can contact the outer wall of the film tube; there is an angle between the planes where the two fixed frames are located, and the ends of the two fixed frames away from the limiting assembly are close to each other; a winder is arranged on the side of the shrinking assembly away from the limiting assembly, and the length direction of the shrinking roller is parallel to the winding roller of the winder.

[0013] Optionally, the retraction assembly also includes two second retraction parts, which are arranged between the two first retraction parts; the second retraction part includes a movable rod and a plurality of control rollers, which are arranged along the length direction of the movable rod, and a plurality of control plates are installed on the movable rod, and the two ends of the control rollers in the length direction are rotatably connected to the control plates, and the control rollers are horizontally arranged; a rotating rod is provided on the working frame, and the rotating rod is located at the bottom end of the working frame close to the fixed frame, and the two ends of the rotating rod in the length direction are rotatably connected to the working frame, and the bottom end of the movable rod in the length direction is fixedly connected to the middle part of the rotating rod; an adjusting member is provided on the working frame, and the adjusting member is located at the top end of the working frame close to the fixed frame, and the adjusting member is connected to the top end of the movable rod, and the adjusting member is used to adjust the angle between the movable rod and the horizontal plane.

[0014] By adopting the above technical solution, when the width of the film to be produced is the maximum value within the design range, the operator controls the angle between the two movable rods through the adjustment member. The film tube first contacts the shrink roller and the control roller at the bottom, and the shrink roller and the control roller just contact the film with the maximum width. The shrink roller and the control roller at the top jointly squeeze it to form an elliptical film tube, and the elliptical film tube is finally overlapped and rolled up by the winder. During the movement, the film tube is cooled and shaped, reducing the occurrence of abnormal deformation of the film tube due to the squeeze of the shrink roller. When the width of the film to be produced decreases, the operator controls the top ends of the two movable rods to approach each other through the adjustment member. The film tube first contacts the control roller located in the middle, but not the shrink roller. The control roller in the middle and upper part squeezes the film tube from both sides to make the film tube converge, and the shrink roller at the top squeezes the film tube into an elliptical shape and sends it into the winder for overlap. The film is rolled up under the joint action of the shrink roller and the control roller, which improves the quality and efficiency of film rolling. When the film tube moves, the friction between the shrink roller and the control roller is static friction, which reduces the possibility of damage to the film tube caused by the shrink roller and the control roller during the production process.

[0015] Optionally, the length of the control roller is smaller than the distance between two contraction rollers in the same horizontal plane, and the length of the control roller at the top end of the movable rod is smaller than the length of the control roller at the bottom end.

[0016] By adopting the above technical solution, the control roller with a shorter top is convenient for the movable rod to move between the two fixed frames; and it can save materials and reduce the cost of the equipment.

[0017] Optionally, the adjusting member includes a support rod, a sliding frame, a gear, a self-locking member and a hand crank; an extension plate is installed on the working frame on the side away from the movable rod, and a rotating bearing is installed on the end of the extension plate away from the working frame, one end of the support rod is connected to the rotating bearing, and the other end of the support rod is rotatably connected to the sliding frame, and the length of the support rod is smaller than the length of the extension plate; the sliding frame is clamped on the movable rod and slidingly cooperates with the movable rod; the gear is rotatably installed in the sliding frame through the shaft rod, and a rack is installed on the side of the movable rod away from the control roller to mesh with the gear, and the self-locking member is installed in the sliding frame, and the self-locking member limits the rotation of the gear through friction; the shaft rod of the gear passes through the sliding frame and is connected to the hand crank.

[0018] By adopting the above technical solution, when the movable rod is in a vertical state, the sliding frame is located above the extension plate. When it is necessary to control the top of the movable rod to fall into the contraction channel, the operator holds the hand crank and rotates counterclockwise with the shaft of the gear as the axis, overcoming the friction of the self-locking part to control the gear to rotate counterclockwise. The gear drives the sliding frame to move downward relative to the movable rod, and the movable rod falls into the contraction channel with the rotating rod as the axis. Adjust the two movable rods in sequence to a symmetrical state. The adjustment operation is relatively simple, which improves the efficiency of the adjustment. In addition, the film tubes produced in the same batch have the same width, and production can be carried out after one adjustment is completed.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. The operator adjusts the limit assembly and the shrink assembly according to the size of the film to be produced, so that the limit assembly and the shrink assembly are adapted to the film tube. The extrusion die head of the film blowing machine extrude the film tube and then blows it up. The inflated film tube moves upward under the pulling force of the winder. If the film tube is blown beyond the designed diameter, the outer wall of the film tube contacts the limit assembly. Since the film tube has not yet solidified at this time, the flexible contact between the limit assembly and the film tube can limit the continued expansion of the film tube without damaging the film tube. Subsequently, the film tube enters the shrink assembly under the pulling force of the winder. The shrink assembly gradually compresses the expanded film tube. During this process, the film tube gradually solidifies and enters the winder for winding, and finally a film roll that meets the designed width is obtained. The limit assembly first limits the degree of inflation, and then the shrink assembly controls the width of the film, which facilitates the winding of the winder and improves the quality and efficiency of winding;

[0021] 2. The operator adjusts the moving range of the limit rod by adjusting the torsion spring so that the diameter of the circle surrounded by all the limit rods in the free state matches the diameter of the film tube after inflation. If the inflation of the film tube is within the set range, the film tube just does not contact the limit shaft. If the expansion of the film tube slightly exceeds the limit range of the limit rod, the outer wall of the film tube contacts the outer walls of multiple limit shafts, and the length direction of the limit shaft is in the tangential direction of the contact point with the film tube. The limit shaft is pushed outward by the film tube, and transmits the thrust to the torsion spring through the limit rod and the torsion rod. The torsion spring is compressed so that the torsion rod drives the limit rod to move away from the film tube, and the diameter of the circle surrounded by all the limit rods increases; under the action of the rotating shaft, the limit rod drives the limit shaft to rotate, so that the limit shaft is in the tangential direction of the contact point with the film tube. At this time, the film tube has not yet solidified, and the film tube undergoes slight elastic deformation at the contact point, and the limit shaft limits the further expansion of the film tube. During this process, the film tube moves upward under the pulling force of the winder, and the limit shaft rolls when in contact with the film tube. The friction between the limit shaft and the film tube is a small static friction force, which reduces the possibility of damage to the film tube by the limit shaft while limiting the excessive expansion of the film tube.

[0022] 3. When the movable rod is in a vertical state, the sliding frame is located above the extension plate. When it is necessary to control the top of the movable rod to fall into the contraction channel, the operator holds the hand crank and rotates counterclockwise with the shaft of the gear as the axis, overcoming the friction of the self-locking part to control the gear to rotate counterclockwise. The gear drives the sliding frame to move downward relative to the movable rod, and the movable rod falls into the contraction channel with the rotating rod as the axis. Adjust the two movable rods in sequence to a symmetrical state. The adjustment operation is relatively simple, which improves the efficiency of the adjustment. In addition, the film tubes produced in the same batch have the same width, and production can be carried out after one adjustment is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a limiting device for a film blowing machine according to an embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of the structure of the limit assembly of the embodiment of the present application.

[0025] Figure 3 It is a schematic diagram of the structure of the contraction component of the embodiment of the present application.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. film blowing machine; 2. working frame; 3. limiting assembly; 31. mounting frame; 311. annular bracket; 312. vertical rod; 32. elastic mounting member; 321. torsion spring; 322. torsion bar; 33. limiting member; 331. limiting rod; 332. limiting plate; 333. limiting shaft; 4. contraction assembly; 41. first contraction member; 411. fixed frame; 412. contraction roller; 42. second contraction member; 421. movable rod; 422. control plate; 423. control roller; 424. rotating rod; 5. adjusting member; 51. supporting rod; 52. sliding frame; 53. gear; 54. self-locking member; 55. hand crank; 56. extension plate; 57. rotating bearing; 58. rack; 6. winder. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 This application is described in further detail.

[0028] The present application embodiment discloses a limiting device for a film blowing machine. Figure 1 A limiting device for a film blowing machine includes a film blowing machine 1, which is placed on the ground. A working frame 2 is installed around the extrusion die of the film blowing machine 1, and the working frame 2 is fixed on the ground. A limiting component 3 is provided on the working frame 2, and the limiting component 3 is located directly above the film blowing machine 1. The limiting component 3 is used to limit the degree of inflation of the film tube. A shrinking component 4 is provided on the side of the limiting component 3 away from the film blowing machine 1, and the shrinking component 4 is installed on the working frame 2. The shrinking component 4 is used to control the width of the finished film. A winder 6 for winding the film is arranged on the side of the shrinking component 4 away from the limiting component 3.

[0029] The operator adjusts the limit assembly 3 and the shrink assembly 4 according to the size of the film to be produced, so that the limit assembly 3 and the shrink assembly 4 are adapted to the film tube. The extrusion die head of the film blowing machine 1 blows up the film tube after extruding it, and the inflated film tube moves upward under the pulling force of the winder 6. If the film tube is blown beyond the designed diameter, the outer wall of the film tube contacts the limit assembly 3. Since the film tube has not yet solidified at this time, the flexible contact between the limit assembly 3 and the film tube can limit the continued expansion of the film tube without damaging the film tube. Subsequently, the film tube enters the shrink assembly 4 under the pulling force of the winder 6, and the shrink assembly 4 gradually compresses the expanded film tube. During this process, the film tube gradually solidifies and enters the winder 6 for winding, and finally a film roll that meets the designed width is obtained.

[0030] Reference Figure 1 and Figure 2 The limiting assembly 3 includes a mounting frame 31, which is sleeved on the outside of the film tube. The mounting frame 31 includes two annular brackets 311, which are arranged in the vertical direction. A plurality of vertical rods 312 are installed between the two annular brackets 311. The vertical rods 312 are arranged vertically, and the two ends of the vertical rods 312 in the length direction are respectively connected to the annular brackets 311 by bolts. In the present embodiment, a total of ten vertical rods 312 are arranged, and the ten vertical rods 312 are evenly arranged along the circumference between the rings. An elastic mounting member 32 is arranged on each vertical rod 312, and the elastic mounting member 32 is installed on the inner side of the annular bracket 311. One end of the elastic mounting member 32 is connected to the mounting frame 31, and the other end is connected to the limiting member 33. In the present embodiment, a total of ten limiting members 33 are arranged, and the ten limiting members 33 are arranged along the circumference of the film tube, and the ten limiting members 33 are arranged toward the film tube, which are used to limit the expansion range of the film tube.

[0031] The elastic mounting member 32 includes two torsion springs 321, which are sleeved on the vertical rod 312 and located at both ends of the length direction of the vertical rod 312. One end of the torsion spring 321 is connected to the vertical rod 312 by a bolt, and the other end is connected to a torsion bar 322 by welding. The torsion bar 322 is rotatably connected to the vertical rod 312 through the torsion spring 321, and the torsion bar 322 rotates in a horizontal plane with the torsion spring 321 as an axis, and the torsion spring 321 controls the rotation range of the torsion bar 322. The length of the torsion bar 322 is smaller than the radius of the annular bracket 311. A rotating shaft is installed at one end of the torsion bar 322 away from the torsion spring 321, and the two torsion bars 322 on each vertical rod 312 are connected to a limit member 33 through a rotating shaft.

[0032] The limiting member 33 includes a limiting rod 331, and the two ends of the limiting rod 331 in the length direction are connected to the two torsion bars 322 on the same vertical rod 312 through a rotating shaft. The limiting rod 331 moves inside the annular bracket 311, and a plurality of limiting plates 332 are arranged on the side wall of the limiting rod 331 away from the annular bracket 311. In this embodiment, a total of six limiting plates 332 are arranged on each limiting rod 331, and the six limiting plates 332 are evenly arranged along the length direction of the limiting rod 331. The limiting plates 332 are connected to the limiting rod 331 by bolts, and the limiting shaft 333 is installed on the side plate of the limiting plate 332 away from the limiting rod 331. The limiting shaft 333 is arranged horizontally, and the two ends of the limiting shaft 333 in the length direction are respectively rotatably connected to the limiting plates 332 through a rotating shaft. The outer peripheral wall of the limiting shaft 333 can contact the outer wall of the film tube, and the contact between the limiting shaft 333 and the film tube is point contact.

[0033] The operator adjusts the moving range of the limit rod 331 by adjusting the torsion spring 321, so that the diameter of the circle surrounded by all the limit rods 331 in the free state is adapted to the diameter of the film tube after inflation. If the inflation of the film tube is within the set range, the film tube just does not contact the limit shaft 333. If the expansion of the film tube slightly exceeds the limit range of the limit rod 331, the outer wall of the film tube contacts the outer walls of multiple limit shafts 333, and the length direction of the limit shaft 333 is in the tangential direction of the contact point with the film tube. The limit shaft 333 is pushed outward by the film tube, and the thrust is transmitted to the torsion spring 321 through the limit rod 331 and the torsion rod 322. The torsion spring 321 is compressed to make the torsion rod 322 drive the limit rod 331 to move away from the film tube, and the diameter of the circle surrounded by all the limit rods 331 increases; under the action of the rotating shaft, the limit rod 331 drives the limit shaft 333 to rotate, so that the limit shaft 333 is in the tangential direction of the contact point with the film tube. At this time, the film tube has not yet solidified, and the film tube undergoes slight elastic deformation at the contact point, and the limit shaft 333 limits the further expansion of the film tube. In this process, the film tube moves upward under the pulling force of the winder 6, and the limit shaft 333 rolls when in contact with the film tube. The friction between the limit shaft 333 and the film tube is a small static friction force, which reduces the possibility of damage to the film tube by the limit shaft 333 while limiting the excessive expansion of the film tube.

[0034] Reference Figure 1 and Figure 3, the film tube leaves the annular support 311 under the pulling force of the winder 6 and then enters the shrinking assembly 4. The shrinking assembly 4 includes two first shrinking members 41, and the two first shrinking members 41 are fixedly mounted on the working frame 2. The shrinking assembly 4 also includes two second shrinking members 42, and the two second shrinking members 42 are adjustably arranged between the two first shrinking members 41. The two first shrinking members 41 are arranged opposite to each other, and the two second shrinking members 42 are arranged opposite to each other. The first shrinking members 41 and the second shrinking members 42 form a shrinking channel, and the winder 6 drives the film tube to pass through the shrinking channel.

[0035] The first shrinking member 41 includes a fixed frame 411, and the fixed frame 411 is fixedly installed in the working frame 2 through a rod. The fixed frame 411 is located between the annular bracket 311 and the winder 6. There is an angle between the planes where the two fixed frames 411 are located, and the ends of the two fixed frames 411 away from the annular bracket 311 are close to each other. A plurality of shrinking rollers 412 are installed on the fixed frame 411, and the plurality of shrinking rollers 412 are arranged along the length direction of the fixed frame 411. The shrinking roller 412 is horizontally arranged, and the two ends of the shrinking roller 412 in the length direction are rotatably connected to the fixed frame 411. The winder 6 is provided with a winding roller, and the length direction of the shrinking roller 412 is arranged parallel to the winding roller of the winder 6. The outer peripheral wall of the shrinking roller 412 can contact the outer wall of the film tube.

[0036] The second contraction member 42 includes a movable rod 421, which is arranged between the two fixed frames 411. A rotating rod 424 is horizontally arranged on the working frame 2, and the rotating rod 424 is located at the bottom end of the working frame 2 close to the fixed frame 411. Both ends of the rotating rod 424 in the length direction are rotatably connected to the working frame 2, and the bottom end of the movable rod 421 in the length direction is fixedly connected to the middle part of the rotating rod 424. An adjusting member 5 is arranged on the working frame 2, and the adjusting member 5 is located at the top end of the working frame 2 close to the fixed frame 411. The adjusting member 5 is connected to the top end of the movable rod 421, and is used to adjust the angle between the movable rod 421 and the horizontal plane.

[0037] A plurality of control panels 422 are installed on the side walls of the two movable rods 421 close to each other. The control panels 422 are arranged in an array along the length direction of the movable rods 421. A control roller 423 is installed on the side panel of the control panel 422 away from the movable rod 421. The two ends of the control roller 423 in the length direction are rotatably connected to the control panel 422 through a rotating shaft. The control roller 423 is arranged horizontally, and the length direction of the control roller 423 is perpendicular to the length direction of the shrinking roller 412. The control roller 423 and the shrinking roller 412 surround the film tube from all sides. The length of the control roller 423 is less than the distance between the two shrinking rollers 412 in the same horizontal plane, and the length of the control roller 423 at the top of the movable rod 421 is less than the length of the control roller 423 at the bottom.

[0038] When the film width to be produced is the maximum value within the design range, the operator controls the angle between the two movable rods 421 through the adjustment member 5. At this time, the angle is the minimum value within the design range, and the angle between the movable rod 421 and the vertical direction is smaller than the angle between the fixed frame 411 and the vertical direction. After the inflated film tube is separated from the limit shaft 333, it first contacts the shrinking roller 412 and the control roller 423 at the bottom. The shrinking roller 412 and the control roller 423 just contact the film with the maximum width. The distance between the two shrinking rollers 412 at the top gradually decreases, and the shrinking roller 412 and the control roller 423 jointly squeeze it to form an elliptical film tube, and the tip of the elliptical film tube contacts the control roller 423. Under the pulling force of the winder 6, the film tube continues to move upward. During the movement, the film tube cools and sets, reducing the occurrence of abnormal deformation of the film tube due to the squeezing of the shrinking roller 412 roller. The elliptical film tube is finally overlapped and rolled by the winder 6.

[0039] When the width of the film to be produced decreases, the operator controls the angle between the two movable rods 421 to increase through the adjustment member 5. After the inflated film tube is separated from the limit shaft 333, it first contacts the control roller 423 located in the middle, but not the shrinking roller 412. As the film tube moves in the shrinking channel, the control roller 423 located in the middle and slightly above squeezes the film tube from both sides to shrink the film tube. When it reaches the top, the shrinking roller 412 located at the top contacts the film tube, squeezes the film tube into an elliptical shape, and sends it to the winder 6 for stacking.

[0040] When the film tube moves, the friction between the shrink roller 412 and the control roller 423 is static friction, which reduces the possibility of the shrink roller 412 and the control roller 423 causing damage to the film tube during the production process.

[0041] Reference Figure 3, an outward extension plate 56 is installed on the side of the working frame 2 away from the movable rod 421 through bolts, and a rotating bearing 57 is installed on the end of the extension plate 56 away from the working frame 2 through bolts. The adjusting member 5 includes a support rod 51, one end of the support rod 51 is rotatably connected to the extension plate 56 through a rotating bearing 57, and the other end is provided with a sliding frame 52, and the support rod 51 and the sliding frame 52 are rotatably connected through a rotating shaft. The length of the support rod 51 is less than the length of the extension plate 56. A clamping plate is provided on the side of the sliding frame 52 away from the support rod 51, and the clamping plate clamps the sliding frame 52 on the movable rod 421 and slides with the movable rod 421. A gear 53 is rotatably installed in the sliding frame 52 through an axial rod, and a rack 58 is installed on the side of the movable rod 421 away from the control roller 423 to mesh with the gear 53. A self-locking member 54 is also provided in the sliding frame 52. The self-locking member 54 is provided on the side of the gear 53 away from the rack 58 and meshes with the gear 53. The self-locking member 54 limits the rotation of the gear 53 through friction. The shaft of the gear 53 passes through the sliding frame 52 and is provided with a hand crank 55 for the operator to hold. A ladder and a platform are provided on the work frame for the operator to climb and walk.

[0042] When the movable rod 421 is in a vertical state, the sliding frame 52 is located above the extension plate 56. When it is necessary to control the top of the movable rod 421 to fall into the contraction channel, the operator holds the hand crank and rotates counterclockwise with the shaft of the gear 53 as the axis, overcoming the friction of the self-locking member 54 to control the gear 53 to rotate counterclockwise. The gear 53 drives the sliding frame 52 to move downward relative to the movable rod 421, and the movable rod 421 falls into the contraction channel with the rotating rod 424 as the axis. The two movable rods 421 are adjusted to a symmetrical state in sequence. The adjustment operation is relatively simple, which improves the efficiency of the adjustment. In addition, the film tubes produced in the same batch have the same width, and production can be carried out after one adjustment is completed.

[0043] The implementation principle of a limiting device for a film blowing machine in an embodiment of the present application is as follows: the film tube is inflated by the blow molding machine, and the elastic contact between the limiting shaft 333 and the film tube limits the expansion range of the film tube. The film tube is squeezed by the shrinking roller 412 and the control roller 423 to form an elliptical film tube, and is rolled up under the action of the shrinking roller 412 and the control roller 423, thereby improving the quality and efficiency of the rolling up. There is static friction between the limiting shaft 333, the shrinking roller 412 and the control roller 423 and the film tube, thereby reducing the damage to the film tube. If the size of the film tube to be produced changes, the operator can adjust the limiting shaft 333 and the control roller 423 by adjusting the torsion spring 321 and the adjusting member 5 to adapt to the width of different films.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A limiting device for a film blowing machine, comprising a film blowing machine (1), characterized in that: A working frame (2) is installed around the film blowing machine (1), and a limiting component (3) is arranged on the working frame (2). The limiting component (3) is located directly above the film blowing machine (1), and the limiting component (3) is used to limit the inflation; a shrinking component (4) is arranged on the side of the limiting component (3) away from the film blowing machine (1), and the shrinking component (4) is installed on the working frame (2), and the shrinking component (4) is used to control the width of the finished film.

2. A limiting device for a film blowing machine according to claim 1, characterized in that: The limiting component (3) comprises a mounting frame (31), an elastic mounting member (32) and a limiting member (33); the mounting frame (31) is sleeved on the outside of the film tube; the elastic mounting member (32) is mounted on the inside of the mounting bracket; one end of the elastic mounting member (32) is connected to the mounting frame (31) and the other end is connected to the limiting member (33); a total of a plurality of limiting members (33) are arranged on the mounting frame (31); the plurality of limiting members (33) are all arranged toward the film tube; the plurality of limiting members (33) are arranged along the circumference of the film tube, and are used to limit the expansion range of the film tube.

3. A limiting device for a film blowing machine according to claim 2, characterized in that: The mounting frame (31) comprises two annular supports (311) and a plurality of vertical rods (312), the two annular supports (311) are arranged in a vertical direction, and the plurality of vertical rods (312) are vertically mounted between the two annular supports (311); an elastic mounting member (32) is arranged on each of the vertical rods (312); the elastic mounting member (32) comprises two torsion springs (321) and two torsion rods (322), the two torsion springs (321) are respectively arranged at a length of the vertical rod (312) and a length of the vertical rod (312). The torsion bar (322) is rotatably connected to the vertical rod (312) via a torsion spring (321) at two ends in a degree direction; the torsion bar (322) is rotatably connected to the vertical rod (312) via a torsion spring (321); the torsion bar (322) rotates in a horizontal plane with the torsion spring (321) as an axis, and the length of the torsion bar (322) is smaller than the radius of the annular bracket (311); the torsion spring (321) controls the rotation range of the torsion bar (322); a rotating shaft is installed at one end of the torsion bar (322) away from the torsion spring (321), and the torsion bar (322) is connected to the limiter (33) via the rotating shaft.

4. A limiting device for a film blowing machine according to claim 3, characterized in that: The limiting member (33) comprises a limiting rod (331), a plurality of limiting plates (332) and a plurality of limiting shafts (333); the two ends of the limiting rod (331) in the length direction are connected to two torsion bars (322) on the same vertical rod (312) through a rotating shaft; the plurality of limiting plates (332) are evenly arranged along the length direction of the limiting rod (331); the limiting shaft (333) is arranged horizontally; the limiting shaft (333) is installed on the side wall of the limiting plate (332) away from the annular bracket (311); the limiting shaft (333) is rotatably connected to the limiting plate (332); the outer peripheral wall of the limiting shaft (333) can contact the outer wall of the film tube; the contact between the limiting shaft (333) and the film tube is point contact.

5. The limiting device for a film blowing machine according to claim 1, characterized in that: The shrinking assembly (4) comprises two first shrinking members (41), the two first shrinking members (41) are fixedly arranged on the working frame (2), the first shrinking member (41) comprises a fixed frame (411) and a plurality of shrinking rollers (412), the fixed frame (411) is installed on the working frame (2), the plurality of shrinking rollers (412) are arranged along the length direction of the fixed frame (411), the shrinking rollers (412) are arranged horizontally, the two ends of the shrinking rollers (412) in the length direction are rotatably connected to the fixed frame (411), and the outer peripheral wall of the shrinking roller (412) can contact the outer wall of the film tube; there is an angle between the planes where the two fixed frames (411) are located, and the ends of the two fixed frames (411) away from the limiting assembly (3) are close to each other; a winding machine (6) is arranged on the side of the shrinking assembly (4) away from the limiting assembly (3), and the length direction of the shrinking roller (412) is arranged parallel to the winding roller of the winding machine (6).

6. A limiting device for a film blowing machine according to claim 5, characterized in that: The contraction assembly (4) further comprises two second contraction members (42), wherein the two second contraction members (42) are arranged between the two first contraction members (41); the second contraction member (42) comprises a movable rod (421) and a plurality of control rollers (423), wherein the plurality of control rollers (423) are arranged along the length direction of the movable rod (421), and a plurality of control plates (422) are installed on the movable rod (421), wherein both ends of the control rollers (423) in the length direction are rotatably connected to the control plates (422), and the control rollers (423) are arranged horizontally and the length direction of the control rollers (423) is perpendicular to the length direction of the contraction rollers (412). The working frame (2) is provided with a rotating rod (424), the rotating rod (424) is located at the bottom end of the working frame (2) close to the fixed frame (411), the two ends of the rotating rod (424) in the length direction are rotatably connected to the working frame (2), and the bottom end of the movable rod (421) in the length direction is fixedly connected to the middle part of the rotating rod (424); the working frame (2) is provided with an adjusting member (5), the adjusting member (5) is located at the top end of the working frame (2) close to the fixed frame (411), the adjusting member (5) is connected to the top end of the movable rod (421), and the adjusting member (5) is used to adjust the angle between the movable rod (421) and the horizontal plane.

7. A limiting device for a film blowing machine according to claim 6, characterized in that: The length of the control roller (423) is smaller than the distance between two contraction rollers (412) in the same horizontal plane, and the length of the control roller (423) at the top end of the movable rod (421) is smaller than the length of the control roller (423) at the bottom end.

8. The limiting device for a film blowing machine according to claim 6, characterized in that: The adjusting member (5) comprises a supporting rod (51), a sliding frame (52), a gear (53), a self-locking member (54) and a hand crank (55); an extension plate (56) is installed on the side of the working frame (2) away from the movable rod (421); a rotating bearing (57) is installed on the end of the extension plate (56) away from the working frame (2); one end of the supporting rod (51) is connected to the rotating bearing (57); the other end of the supporting rod (51) is rotatably connected to the sliding frame (52); the length of the supporting rod (51) is less than the length of the extension plate (56). length; the sliding frame (52) is clamped on the movable rod (421) and slidably cooperates with the movable rod (421); the gear (53) is rotatably installed in the sliding frame (52) through an axle rod, and a rack (58) is installed on the side of the movable rod (421) away from the control roller (423) to mesh with the gear (53); the self-locking member (54) is installed in the sliding frame (52), and the self-locking member (54) limits the rotation of the gear (53) through friction; the axle rod of the gear (53) passes through the sliding frame (52) and is connected to the hand crank (55).

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