PE (polyethylene) film blowing mold for manufacturing packaging bag

Abstract

The invention relates to the technical field of blowing molds, in particular to a PE film blowing mold for manufacturing packaging bags, which comprises an outer mold head, an inner mold core, a cleaning assembly and a cleaning block, a spiral runner is arranged on the inner mold core, the outer mold head is fixedly sleeved on the inner mold core, an extrusion channel is formed by the inner wall of the outer mold head and the spiral runner, and the cleaning assembly is fixedly sleeved on the outer mold core. The inner mold core is sleeved with the cleaning assembly, the cleaning block is made of a rubber material and installed on the cleaning assembly, and the outer surface of the cleaning block is attached to the spiral runner in shape. Thrust is applied to the cleaning assembly through air pressure, the cleaning assembly is made to move in the vertical direction, the cleaning block discharges aggregate and deposited carbon from the position above the extrusion channel, the situation that when the inner mold core is cleaned, the inner mold core and the outer mold head need to be detached for cleaning, time and labor are wasted is avoided, and the aggregate inside and around the spiral runner is prevented from forming the deposited carbon; the stable production quality of the PE film is ensured; and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of blow molding molds, in particular to a PE film blow molding mold for making packaging bags. Background Art

[0002] PE film, or polyethylene film, refers to a film produced from PE particles. PE film has the advantages of moisture resistance and low moisture permeability, and is widely used in food packaging, agricultural production, electrical and electronic, optical display and other fields. Polyethylene film can be manufactured into products with different properties such as low-density, medium-density, high-density polyethylene and cross-linked polyethylene according to different manufacturing methods and control means. Blow molding is the most important forming method for plastic film production. In the film blowing process, a single resin particle or a mixture of resin particles is added to the hopper, and after being plasticized and melted by the extruder, it enters the mold, flows along the internal flow channel of the mold and extrude a ring-shaped tube embryo from the die mouth. The inflated tube embryo is cooled by the cooling air provided by the internal and external cooling systems, and then is towed and rolled by a rotating traction frame located above the die head to obtain a film product. Finally, the film can be cut and processed to make a packaging bag. The existing extrusion blow molding mold generally includes an inner die head and an outer die head sleeved on the inner die head. The inner die head is provided with a flow channel. Each time PE film is produced, aggregates are easily generated on the surface and periphery of the flow channel, resulting in pressure loss. Long-term aggregates are prone to form carbon deposits, thereby increasing the risk of film breakage. Therefore, the inner die head needs to be cleaned regularly, but when cleaning the existing blow molding mold, the entire inner die head and the outer die head need to be disassembled and cleaned separately, which is time-consuming and labor-intensive.

[0003] In order to avoid the difficulty of cleaning the inside of the blow mold, prevent the material from remaining on the surface of the flow channel for a long time to form carbon deposits, and reduce the risk of PE film rupture, the invention patent with application number CN202222868005.9 provides a co-extrusion blown film machine die head carbon deposit removal device. The invention is provided by setting an outer mold sleeve, an inner mold head is arranged in the outer mold sleeve, and a group of evenly distributed spiral flow channels are arranged on the outer circumferential surface of the inner mold head. One end face of the inner mold head is provided with a planar flow channel corresponding to the spiral flow channel respectively. A pair of radially arranged connecting holes are provided on the inner die head of each spiral flow channel and the planar flow channel, and one end of the pair of connecting holes is respectively connected to The planar flow channel and the spiral flow channel are connected, and the other end passes through the outer mold sleeve to the outer circumference of the outer membrane sleeve. A reversing valve is provided on the outer mold sleeve. The first flow hole and the second flow hole of the reversing valve are respectively connected with the connecting hole. The third flow hole of the reversing valve is connected to an output end of an air pump through a pipeline. Friction particles are provided in the pipeline between the third flow hole and the output end of the air pump. Under the action of air pressure, the friction particles clean the flow channel without disassembling the inner mold head and the outer mold sleeve, thereby saving time and effort in cleaning work and improving work efficiency. However, the particle friction method will leave gaps in the cleaning process and the carbon deposits cannot be completely removed.

[0004] Therefore, in order to avoid the generation of aggregates on the flow channel surface and the surrounding area of ​​the blow mold after long-term production of PE film, resulting in pressure loss and carbon deposition that affects the film quality, a PE film blow mold for making packaging bags is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a PE film blow molding mold for making packaging bags. In order to prevent the generation of aggregates in and around the spiral flow channel after multiple production of PE films, resulting in pressure loss, and the formation of carbon deposits over a long period of time, thereby causing film breakage, a cleaning component is arranged inside the outer die head, and a cleaning block is installed on the cleaning component. The surface shape of the cleaning block fits the spiral flow channel. When the inner mold core needs to be cleaned, the air pump applies thrust to the cleaning component through air pressure to move the cleaning component in the vertical direction. While the cleaning component moves, the cleaning block moves along the trajectory of the spiral flow channel to scrape off the aggregates and carbon deposits in the spiral flow channel and push them onto the cleaning component. Finally, the aggregates and carbon deposits are discharged from above the extrusion channel, avoiding the need to disassemble the inner mold core and the outer die head for cleaning when cleaning the inner mold core, which is time-consuming and labor-intensive. The formation of carbon deposits in and around the spiral flow channel is prevented, thereby ensuring the stable production quality of the PE film and improving the production efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A PE film blow molding mold for making packaging bags, comprising an outer die head, an inner die core, a cleaning component, and a cleaning block, wherein the inner die core is set to a cylindrical shape, a spiral flow channel is opened on the inner die core, a feed port is opened at the bottom of the inner die core, two discharge ports are symmetrically opened inside the inner die core, and the discharge ports connect the spiral flow channel with the feed port, the outer die head is fixedly sleeved on the inner die core, the inner diameter of the outer die head is larger than the outer diameter of the inner die core, the inner wall of the outer die head and the spiral flow channel form an extrusion channel, the cleaning component is sleeved on the inner die core, the cleaning component is located in the extrusion channel, the cleaning block is made of rubber material, the cleaning block is installed on the cleaning component, the outer surface shape of the cleaning block fits the spiral flow channel, the bottom of the outer die head is connected to an air pump, the cleaning component moves by the thrust provided by the air pump, and the cleaning block moves along the spiral flow channel trajectory when the cleaning component moves.

[0008] The inner mold core is set to be cylindrical, the spiral flow channel is opened around the outer wall of the inner mold core, the outer mold head is also set to be cylindrical to completely wrap the inner mold core, the bottom of the inner mold core is fixedly connected to the bottom of the outer mold head, a circular opening is opened at the bottom of the outer mold head, the circular opening is connected to the extrusion port of the extruder, the circular opening connects the extrusion port with the feed port, the upper end of the outer mold head is connected to the cooling air ring of the blow molding system, in the film blowing process, a single resin particle or a mixture of resin particles is added to the hopper, and after being plasticized and melted by the extruder, it enters the inner mold core, the molten resin particles flow out from the two discharge ports, flow upward along the bottom of the spiral flow channel, and extrude a ring-shaped tube embryo from the extrusion channel, and the tube embryo blown up by the cooling air ring is cooled by the cooling air provided by the internal and external cooling systems , and then it is pulled and rolled by a rotating traction frame located above the blow mold to finally obtain a PE film product. The air pump is connected to the extrusion flow channel. When the inner mold core needs to be cleaned, the air pump applies thrust to the cleaning component through air pressure to move the cleaning component in the vertical direction. While the cleaning component moves, the cleaning block moves along the trajectory of the spiral flow channel to scrape off the aggregates and carbon deposits inside the spiral flow channel and push them onto the cleaning component. Finally, the aggregates and carbon deposits are discharged from the top of the extrusion channel, avoiding the need to disassemble the inner mold core and the outer die head for cleaning when cleaning the inner mold core, which is time-consuming and labor-intensive. It prevents the formation of carbon deposits on the aggregates inside and around the spiral flow channel after multiple production of PE films, causing pressure loss and film breakage, thereby ensuring the stable production quality of PE films and improving production efficiency.

[0009] Preferably, the cleaning assembly comprises a cylindrical cylinder, an ejection cylinder, a bearing seat, a rotating buckle, a thrust spring, and a pushing piece, the cylindrical cylinder is slidably connected to the ejection cylinder, the inner diameter of the upper part of the ejection cylinder is the same as the outer diameter of the inner mold core, the bearing seat is clamped inside the cylindrical cylinder, the bearing seat can rotate along the inner circle of the cylindrical cylinder, the bearing seat is set in an L shape, the rotating buckle is rotatably mounted on the bearing seat, a circular clamping groove is provided inside the ejection cylinder, one end of the rotating buckle is clamped in the circular clamping groove, one end of the thrust spring is horizontally fixedly mounted on the bearing seat, and the other end of the thrust spring is fixedly connected to the side wall of the rotating buckle, the pushing piece is made of elastic metal material, one end of the push piece is rotatably mounted on the rotating buckle, and the other end is fixedly connected to the inside of the cleaning block, the top of the cleaning block is flush with the top of the ejection cylinder, and two trigger grooves are symmetrically provided on the inner mold core. When the cleaning block is located in the trigger groove, the rotating buckle rotates in a limited position.

[0010] By slidingly connecting the cylindrical cylinder and the ejection cylinder, the ejection cylinder can be separated from the cylindrical cylinder and move in the vertical direction. The cylindrical cylinder and the ejection cylinder are coaxially sleeved on the inner mold core, and the ejection cylinder is above the cylindrical cylinder. When the inner mold core needs to be cleaned, the cylindrical cylinder and the ejection cylinder are affected by the thrust of the air pressure and move vertically upward along the axis of the inner mold core. The cleaning block is rotatably installed on the cylindrical cylinder through the push piece and the bearing seat. Affected by the trajectory of the spiral flow channel, the cleaning block can only make a spiral upward movement around the inner mold core. While the cleaning block spirally rises, the bearing seat makes a circular motion around the axis of the inner mold core, and one end of the rotating buckle is in The cleaning block slides in the circular groove. When the cleaning block completes the trajectory of the spiral flow channel and pushes the aggregate and carbon deposits to the top of the ejection cylinder, the cleaning block enters the trigger groove from the end of the spiral flow channel. The cleaning block is deformed by the extrusion of the trigger groove, and the pushing piece fixed on the cleaning block is displaced. The thrust spring is compressed by the side wall of the rotating buckle, pushing the rotating buckle to rotate within a limited position. One end of the rotating buckle leaves the circular groove. Under the continuous thrust of the air pressure, the ejection cylinder leaves the upper surface of the cylindrical barrel and pushes the aggregate and carbon deposits out of the extrusion channel, which is convenient for collecting and cleaning the aggregate and carbon deposits and improving the cleaning efficiency of the aggregate and carbon deposits.

[0011] Preferably, a sealing ring is fixedly mounted on the ejection cylinder, the sealing ring is in the extrusion channel, the sealing ring is made of rubber material, the inner diameter of the sealing ring is 0.5-1 mm smaller than the outer diameter of the inner mold core, and the sealing ring fits against the outer wall of the inner mold core.

[0012] By fixing the sealing ring on the top of the ejection cylinder, since the inner diameter of the sealing ring is smaller than the outer diameter of the inner mold core, the inside of the sealing ring is in close contact with the outer wall of the inner mold core. When the air pressure enters the extrusion channel from the bottom of the cylindrical cylinder, the sealing ring enhances the pushing effect of the air pressure. When the cleaning component moves vertically upward, the sealing ring moves with the cleaning component and slides relative to the inner mold core. The sealing ring can scrape off the aggregates and carbon deposits on the outside of the spiral flow channel, thereby improving the cleaning effect of the cleaning component.

[0013] Preferably, the cross-section of the outer edge of the sealing ring is set to be an arc shape, the outer edge of the sealing ring is in contact with the inner wall of the outer die head, a metal spring with the same shape as the sealing ring is arranged inside the sealing ring, and the outer edge of the sealing ring is deformed when the cleaning assembly moves.

[0014] By setting the cross-section of the outer edge of the sealing ring to an arc shape, when the cleaning component moves vertically upward, the outer edge of the sealing ring bulges upward and slides relatively to the inner wall of the outer die head; when the cleaning component is finished and needs to be reset, the cleaning component moves from top to bottom, and the outer edge of the sealing ring is recessed downward, still sliding relatively to the inner wall of the outer die head; the metal spring sheet enhances the deformation speed of the sealing ring and the fitting effect with the inner wall of the outer die head, thereby preventing aggregates and carbon deposits from falling under the extrusion channel and improving the sealing effect of the sealing ring.

[0015] Preferably, two square grooves are symmetrically opened on the inner mold core, the width of the square groove is the same as the width of the cleaning block, the square groove is located below the discharge port, the trigger groove is located above the end of the spiral flow channel, and the trigger groove is connected to the end of the spiral flow channel.

[0016] By opening a square groove on the inner mold core, during the film blowing process, the cleaning block is located in the square groove, and the cleaning component is located below the discharge port. The cleaning component will not affect the extrusion of the molten resin particles. When the cleaning component is working, the cleaning block completes the stroke of the spiral flow channel and pushes the aggregates and carbon deposits completely to the top of the ejection cylinder. Only then will it enter the trigger groove to separate the ejection cylinder from the cylindrical cylinder. The ejection cylinder pushes the aggregates and carbon deposits out of the extrusion channel to ensure the cleaning effect of the cleaning component.

[0017] Preferably, a chamfer is provided at the connection point between the trigger groove and the spiral flow channel, and a chamfer is provided at the edge of the trigger groove.

[0018] By setting multiple rounded corners, when the cleaning block enters the trigger groove from the spiral flow channel, the friction between the surface of the cleaning block and the sharp part of the trigger groove is reduced, the surface of the cleaning block is protected, and the service life of the cleaning block is increased.

[0019] Preferably, a locking hole is provided above the rotating buckle, and a locking plate is fixedly installed inside the cleaning block. The locking plate is made of elastic metal material, and one end of the locking plate is set to a cylindrical shape to cooperate with the locking hole. The horizontal position of the connection between the locking plate and the cleaning block is higher than the locking hole.

[0020] By arranging a locking hole and a locking plate on the rotating buckle, the rotating buckle of the cleaning component can be prevented from rotating due to external force when working, and the ejection cylinder can be prevented from being separated from the cylindrical barrel before all aggregates and carbon deposits are collected, thereby improving the working stability of the cleaning component.

[0021] Preferably, an inclined slope is provided inside the trigger groove, the inclined slope is inclined upward from the connection point between the trigger groove and the spiral flow channel, and the inclined slope extends to the outer wall of the inner mold core.

[0022] By setting an inclined slope in the trigger groove, when the cleaning block enters the trigger groove from the spiral flow channel, the upper end of the cleaning block is squeezed first, and the locking piece fixed on the cleaning block rotates due to the squeezing, and the cylindrical end of the locking piece leaves the locking hole. As the cleaning block moves in the trigger groove, the cleaning block is squeezed and deformed as a whole, and the pushing piece will be displaced, pushing the rotating buckle to rotate within a limited position, and one end of the rotating buckle leaves the circular slot, and the pushing cylinder can be detached from the cylindrical cylinder. The pushing cylinder is unlocked in the following steps to improve the reliability of the cleaning assembly.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By connecting the cleaning block with the cleaning component, the cleaning component moves under the influence of air pressure while the cleaning block moves along the trajectory of the spiral flow channel, scraping the aggregates and carbon deposits inside the spiral flow channel and pushing them onto the cleaning component, and finally the aggregates and carbon deposits are discharged from the top of the extrusion channel, avoiding the need to disassemble the inner mold core and the outer die head for cleaning when cleaning the inner mold core, which is time-consuming and labor-intensive. It prevents the formation of carbon deposits in and around the spiral flow channel after multiple production of PE films, resulting in pressure loss and film breakage, thereby ensuring the stable production quality of PE films and improving production efficiency.

[0025] 2. By setting a trigger groove on the inner mold core, the cleaning block is deformed by extrusion after entering the trigger groove, the pushing piece fixed on the cleaning block is displaced, and the thrust spring is compressed by the side wall of the rotating buckle, pushing the rotating buckle to rotate within a limited position, and one end of the rotating buckle leaves the circular groove. Under the continuous thrust of the air pressure, the cylinder is pushed out of the upper surface of the cylindrical cylinder, pushing the aggregate and carbon deposits out of the extrusion channel, making it easier to collect and clean the aggregate and carbon deposits, thereby improving the cleaning efficiency of the aggregate and carbon deposits.

[0026] 3. By fixing the sealing ring on the ejection cylinder, the inside of the sealing ring is in close contact with the outer wall of the inner mold core. When the air pressure enters the extrusion channel from the bottom of the cylindrical cylinder, the sealing ring enhances the pushing effect of the air pressure. When the cleaning component moves vertically upward, the sealing ring moves with the cleaning component and slides relative to the inner mold core. The sealing ring can scrape off the aggregates and carbon deposits outside the spiral flow channel, thereby improving the cleaning effect of the cleaning component. The cross-section of the outer edge of the sealing ring is set to an arc shape to prevent aggregates and carbon deposits from falling under the extrusion channel, thereby improving the sealing effect of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0029] Figure 3 A schematic diagram of the cleaning block of the present invention being located in a square groove;

[0030] Figure 4 is a cut-away side view of the present invention;

[0031] Figure 5 A schematic diagram of the movement of the cleaning component of the present invention;

[0032] Figure 6 It is a schematic diagram of the ejection cylinder of the present invention leaving the cylindrical cylinder;

[0033] Figure 7 It is a schematic diagram of the structure of the cleaning component of the present invention;

[0034] Figure 8It is a schematic diagram of the deformation of the cleaning block of the present invention.

[0035] In the figure: 1. outer die head; 2. inner die core; 21. spiral flow channel; 22. feed port; 23. discharge port; 24. trigger groove; 25. square groove; 26. inclined slope; 3. cleaning assembly; 31. cylindrical barrel; 32. ejection cylinder; 321. circular slot; 33. bearing seat; 34. rotating buckle; 341. locking hole; 35. thrust spring; 36. pushing plate; 4. cleaning block; 5. extrusion channel; 6. sealing ring; 7. locking plate. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "symmetrical", "vertical", "upper", "inside", "one end", "below", "fit" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] See also Figures 1 to 8 The present invention provides a PE film blowing mold for making packaging bags, and the technical solution is as follows:

[0039] The inner mold core 2 is combined with the outer mold head 1 to form a blow mold. The inner mold core 2 is set to a cylindrical shape. A spiral flow channel 21 is opened on the inner mold core 2. The spiral flow channel 21 surrounds the outer wall of the inner mold core 2. The outer mold head 1 is also set to a cylindrical shape. The outer mold head 1 is fixedly sleeved on the inner mold core 2. The outer mold head 1 completely wraps the inner mold core 2. The bottom of the inner mold core 2 is fixedly connected to the bottom of the outer mold head 1. A feed port 22 is opened at the bottom of the inner mold core 2. Two discharge ports 23 are symmetrically opened inside the inner mold core 2. The discharge port 23 connects the spiral flow channel 21 with the feed port 22. The inner diameter of the outer mold head 1 is larger than that of the inner mold core 2. The outer diameter of the mold core 2, the inner wall of the outer die head 1 and the spiral flow channel 21 form an extrusion channel 5, a cleaning component 3 is arranged on the inner mold core 2, the cleaning component 3 is located in the extrusion channel 5, and a cleaning block 4 is connected to the cleaning component 3. The cleaning block 4 is made of rubber material, and the outer surface shape of the cleaning block 4 fits the spiral flow channel 21. The bottom of the outer die head 1 is connected to the air pump, and a circular port is opened at the bottom of the outer die head 1. The circular port is connected to the extrusion port of the extruder, and the circular port connects the extrusion port with the feed port 22. The upper end of the outer die head 1 is connected to the cooling air ring of the blow molding system. During the film blowing process, A single resin pellet or a mixture of resin pellets is added to the hopper, and after being plasticized and melted by the extruder, it enters the inner mold core 2. The molten resin pellets flow out from the two discharge ports 23, flow upward along the bottom of the spiral flow channel 21, and extrude the annular tube embryo from the extrusion channel 5. The tube embryo inflated by the cooling air ring is cooled by the cooling air provided by the internal and external cooling systems, and then is pulled and rolled by the rotating traction frame located above the blow mold, and finally a PE film product is obtained. The air pump is connected to the extrusion flow channel. When the inner mold core 2 needs to be cleaned, the air pump applies thrust to the cleaning component 3 through air pressure. , so that the cleaning component 3 moves in the vertical direction, and the cleaning block 4 moves along the trajectory of the spiral flow channel 21 while the cleaning component 3 moves, and the aggregates and carbon deposits inside the spiral flow channel 21 are scraped off and pushed onto the cleaning component 3, and finally the aggregates and carbon deposits are discharged from the top of the extrusion channel 5, avoiding the need to disassemble the inner mold core 2 and the outer die head 1 for cleaning when cleaning the inner mold core 2, which is time-consuming and labor-intensive, and preventing the formation of carbon deposits in and around the spiral flow channel 21 after multiple production and manufacturing of PE films, resulting in pressure loss and film breakage, thereby ensuring the stable production quality of PE films and improving production efficiency;The cleaning assembly 3 includes a cylindrical barrel 31, a push-out cylinder 32, a bearing seat 33, a rotating buckle 34, a thrust spring 35, and a pushing sheet 36. The cylindrical barrel 31 is slidably connected to the push-out cylinder 32. The inner diameter of the upper part of the push-out cylinder 32 is the same as the outer diameter of the inner mold core 2. The bearing seat 33 is clamped inside the cylindrical barrel 31. The bearing seat 33 can rotate along the inner circle of the cylindrical barrel 31. The bearing seat 33 is set in an L shape. The rotating buckle 34 is rotatably installed on the bearing seat 33. A circular groove 321 is set inside the push-out cylinder 32. One end of the rotating buckle 34 is clamped in the circular groove 321. One end of the thrust spring 35 is horizontal. The push piece 36 is made of elastic metal material, one end of the push piece 36 is rotatably mounted on the rotating buckle 34, and the other end is fixedly connected to the inside of the cleaning block 4. The top of the cleaning block 4 is flush with the top of the ejection cylinder 32. Two trigger grooves 24 are symmetrically provided on the inner mold core 2. When the cleaning block 4 is located in the trigger groove 24, the rotating buckle 34 rotates in a limited position, and the ejection cylinder 32 can be separated from the cylindrical cylinder 31 and move in the vertical direction. The cylindrical cylinder 31 and the ejection cylinder 32 are coaxially sleeved on the inner mold core 2. The cylinder 32 is above the cylindrical cylinder 31. When the inner mold core 2 needs to be cleaned, the cylindrical cylinder 31 and the ejection cylinder 32 are affected by the thrust of the air pressure and move vertically upward along the axis of the inner mold core 2. The cleaning block 4 is rotatably installed on the cylindrical cylinder 31 through the push piece 36 and the bearing seat 33. Affected by the trajectory of the spiral flow channel 21, the cleaning block 4 can only make a spiral upward movement around the inner mold core 2. While the cleaning block 4 spirally rises, the bearing seat 33 makes a circular movement around the axis of the inner mold core 2. One end of the rotating buckle 34 slides in the circular groove 321. When the cleaning block 4 completes the trajectory of the spiral flow channel 21, the aggregate and After the carbon deposits are pushed to the top of the ejection cylinder 32, the cleaning block 4 enters the trigger groove 24 from the end of the spiral flow channel 21, and the cleaning block 4 is squeezed and deformed by the trigger groove 24, and the pushing piece 36 fixed on the cleaning block 4 is displaced, and the thrust spring 35 is compressed by the side wall of the rotating buckle 34, pushing the rotating buckle 34 to rotate within a limited position, and one end of the rotating buckle 34 leaves the circular groove 321. Under the continuous thrust of the air pressure, the ejection cylinder 32 leaves the upper surface of the cylindrical tube 31, and the aggregates and carbon deposits are pushed out of the extrusion channel 5, so that the aggregates and carbon deposits can be collected and cleaned, thereby improving the cleaning efficiency of the aggregates and carbon deposits.Two square grooves 25 are symmetrically provided on the inner mold core 2. The width of the square grooves 25 is the same as that of the cleaning block 4. The square grooves 25 are located below the discharge port 23. The trigger groove 24 is located above the end of the spiral flow channel 21. The trigger groove 24 is connected to the end of the spiral flow channel 21. During the film blowing process, the cleaning block 4 is located in the square groove 25, and the cleaning component 3 is located below the discharge port 23. The cleaning component 3 will not affect the extrusion of the molten resin particles. When the cleaning component 3 is working, the cleaning block 4 will complete the travel of the spiral flow channel 21 and push the aggregate and carbon deposits completely to the top of the push-out cylinder 32 before entering the trigger groove 24 to separate the push-out cylinder 32 from the cylindrical cylinder 31. The push-out cylinder 32 pushes the aggregate and carbon deposits out of the extrusion channel 5 to ensure the cleaning effect of the cleaning component 3. ;

[0040] As an embodiment of the present invention, refer to Figures 4 to 8A sealing ring 6 is fixedly installed on the push cylinder 32. The sealing ring 6 is in the extrusion channel 5. The sealing ring 6 is made of rubber material. The inner diameter of the sealing ring 6 is 1 mm smaller than the outer diameter of the inner mold core 2. Since the inner diameter of the sealing ring 6 is smaller than the outer diameter of the inner mold core 2, the inside of the sealing ring 6 is in close contact with the outer wall of the inner mold core 2. When the air pressure enters the extrusion channel 5 from the bottom of the cylindrical tube 31, the sealing ring 6 enhances the pushing effect of the air pressure. When the cleaning component 3 moves vertically upward, the sealing ring 6 moves with the cleaning component 3 and slides relative to the inner mold core 2. The sealing ring 6 can scrape off the aggregate and carbon deposits outside the spiral flow channel 21. , improve the cleaning effect of the cleaning component 3; the cross-section of the outer edge of the sealing ring 6 is set to be an arc shape, the outer edge of the sealing ring 6 is in contact with the inner wall of the outer die head 1, and a metal spring with the same shape as the sealing ring 6 is arranged inside the sealing ring 6. When the cleaning component 3 moves, the outer edge of the sealing ring 6 is deformed. When the cleaning component 3 moves vertically upward, the outer edge of the sealing ring 6 bulges upward and slides relatively with the inner wall of the outer die head 1. When the cleaning component 3 is finished and needs to be reset, the air pump provides suction force through negative pressure to move the cleaning component 3 from top to bottom, and the outer edge of the sealing ring 6 is concave downward, still in contact with the outer die head 1 is in close contact with the inner wall of the outer die head 1 and slides relatively. The metal spring sheet strengthens the deformation speed of the sealing ring 6 and the fitting effect with the inner wall of the outer die head 1, preventing aggregates and carbon deposits from falling under the extrusion channel 5, and improving the sealing effect of the sealing ring 6; a chamfer is provided at the connection between the trigger groove 24 and the spiral flow channel 21, and a chamfer is provided at the edge of the trigger groove 24. Through the setting of multiple fillets, when the cleaning block 4 enters the trigger groove 24 from the spiral flow channel 21, the friction between the surface of the cleaning block 4 and the sharp part of the trigger groove 24 is reduced, the surface of the cleaning block 4 is protected, and the service life of the cleaning block 4 is increased; a chamfer is provided above the rotating buckle 34 There is a locking hole 341, and a locking piece 7 is fixedly installed inside the cleaning block 4. The locking piece 7 is made of elastic metal material and can be elastically deformed. One end of the locking piece 7 is set to a cylindrical shape to cooperate with the locking hole 341. The horizontal position of the connection between the locking piece 7 and the cleaning block 4 is higher than the locking hole 341. By setting the locking hole 341 on the rotating buckle 34 and cooperating with the locking piece 7, the rotating buckle 34 of the cleaning component 3 is prevented from rotating due to external force during operation, and the ejection cylinder 32 is prevented from being separated from the cylindrical cylinder 31 before collecting all the aggregates and carbon deposits, thereby improving the working stability of the cleaning component 3;The trigger groove 24 is provided with an inclined slope 26, which is inclined upward from the connection point between the trigger groove 24 and the spiral flow channel 21, and extends to the outer wall of the inner mold core 2. When the cleaning block 4 enters the trigger groove 24 from the spiral flow channel 21, the upper end of the cleaning block 4 is squeezed first, and the locking piece 7 fixed on the cleaning block 4 is squeezed and rotated, and the cylindrical end of the locking piece 7 leaves the locking hole 341. As the cleaning block 4 moves in the trigger groove 24, the cleaning block 4 is squeezed and deformed as a whole, and the push piece 36 will be displaced, pushing the rotating buckle 34 to rotate in a limited position, and one end of the rotating buckle 34 leaves the circular clamping groove 321, and the push cylinder 32 can be separated from the cylindrical cylinder 31. The push cylinder 32 is unlocked in the following steps to improve the reliability of the cleaning assembly 3. ;

[0041] Working principle: During the film blowing process, a single resin pellet or a mixture of resin pellets is added to the hopper, and after being plasticized and melted by the extruder, it enters the inner mold core 2. The molten resin pellets flow out from the two outlets 23, flow upward along the bottom of the spiral flow channel 21, and extrude the annular tube embryo from the extrusion channel 5. The tube embryo blown by the cooling air ring is cooled by the cooling air provided by the internal and external cooling systems, and then it is pulled and rolled by the rotating traction frame located above the blow molding mold. Finally, the PE film product is obtained. When the inner mold core 2 needs During cleaning, the cylindrical barrel 31 and the ejection cylinder 32 are affected by the thrust of the air pressure and move vertically upward along the axis of the inner mold core 2. The cleaning block 4 is rotatably mounted on the cylindrical barrel 31 through the push piece 36 and the bearing seat 33. Affected by the trajectory of the spiral flow channel 21, the cleaning block 4 can only make a spiral upward movement around the inner mold core 2. While the cleaning block 4 spirally rises, the bearing seat 33 makes a circular movement around the axis of the inner mold core 2. One end of the rotating buckle 34 slides in the circular groove 321, and the inside of the sealing ring 6 slides relative to the inner mold core 2. The arc-shaped outer edge of the sealing ring 6 slides relative to the inner wall of the outer die head 1. When the cleaning block 4 completes the trajectory of the spiral flow channel 21 and pushes the aggregate and carbon deposits to the top of the ejection cylinder 32, the cleaning block 4 enters the trigger groove 24 from the end of the spiral flow channel 21. The upper end of the cleaning block 4 is squeezed first, and the locking piece 7 fixed on the cleaning block 4 is squeezed and rotated. The cylindrical end of the locking piece 7 leaves the locking hole 341. As the cleaning block 4 moves in the trigger groove 24, the cleaning block 4 is squeezed and deformed as a whole and fixed in the cleaning block 4 is displaced, and the thrust spring 35 is compressed by the side wall of the rotating buckle 34, pushing the rotating buckle 34 to rotate within a limited position, and one end of the rotating buckle 34 leaves the circular slot 321. Under the continuous thrust of the air pressure, the pushing cylinder 32 leaves the upper surface of the cylindrical cylinder 31, pushing the aggregate and carbon deposits out of the extrusion channel 5. When the aggregate and carbon deposits are cleaned, the air pump provides suction through negative pressure to move the cleaning assembly 3 from top to bottom, and the cleaning block 4 moves into the square slot 25, and the cleaning assembly 3 is reset.

[0042] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A PE film blowing mold for making packaging bags, characterized in that: The invention comprises an outer die head (1), an inner die core (2), a cleaning assembly (3) and a cleaning block (4); the inner die core (2) is arranged in a cylindrical shape; a spiral flow channel (21) is provided on the inner die core (2); a feed port (22) is provided at the bottom of the inner die core (2); two discharge ports (23) are symmetrically provided inside the inner die core (2); the discharge ports (23) connect the spiral flow channel (21) with the feed port (22); the outer die head (1) is fixedly sleeved on the inner die core (2); the inner diameter of the outer die head (1) is larger than the outer diameter of the inner die core (2); the outer die head (1) The inner wall and the spiral flow channel (21) form an extrusion channel (5), the cleaning component (3) is sleeved on the inner mold core (2), the cleaning component (3) is located in the extrusion channel (5), the cleaning block (4) is made of rubber material, the cleaning block (4) is installed on the cleaning component (3), the outer surface shape of the cleaning block (4) fits the spiral flow channel (21), the bottom of the outer die head (1) is connected to the air pump, the cleaning component (3) moves by the thrust provided by the air pump, and when the cleaning component (3) moves, the cleaning block (4) moves along the trajectory of the spiral flow channel (21).

2. A PE film blowing mold for making packaging bags according to claim 1, characterized in that: The cleaning assembly (3) comprises a cylindrical cylinder (31), an ejection cylinder (32), a bearing seat (33), a rotating buckle (34), a thrust spring (35) and a pushing sheet (36); the cylindrical cylinder (31) is slidably connected to the ejection cylinder (32); the inner diameter of the upper part of the ejection cylinder (32) is the same as the outer diameter of the inner mold core (2); the bearing seat (33) is clamped inside the cylindrical cylinder (31); the bearing seat (33) can rotate along the inner circle of the cylindrical cylinder (31); the bearing seat (33) is arranged in an L shape; the rotating buckle (34) is rotatably mounted on the bearing seat (33); a circular clamping groove (321) is arranged inside the ejection cylinder (32); the rotating buckle (34) is rotatably mounted on the bearing seat (33); a circular clamping groove (321) is arranged inside the ejection cylinder (32); One end of the movable buckle (34) is clamped in the circular clamping groove (321), one end of the thrust spring (35) is horizontally fixedly installed on the bearing seat (33), and the other end of the thrust spring (35) is fixedly connected to the side wall of the rotating buckle (34). The pushing piece (36) is made of elastic metal material, one end of the pushing piece (36) is rotatably installed on the rotating buckle (34), and the other end is fixedly connected to the inside of the cleaning block (4), the top of the cleaning block (4) is flush with the top of the ejection cylinder (32), and two trigger grooves (24) are symmetrically provided on the inner mold core (2), and when the cleaning block (4) is located in the trigger groove (24), the rotating buckle (34) is limitedly rotated.

3. A PE film blowing mold for making packaging bags according to claim 2, characterized in that: A sealing ring (6) is fixedly mounted on the ejection cylinder (32). The sealing ring (6) is located in the extrusion channel (5). The sealing ring (6) is made of rubber material. The inner diameter of the sealing ring (6) is 0.5-1 mm smaller than the outer diameter of the inner mold core (2). The sealing ring (6) fits the outer wall of the inner mold core (2).

4. A PE film blowing mold for making packaging bags according to claim 3, characterized in that: The cross-section of the outer edge of the sealing ring (6) is arranged to be in the shape of an arc, the outer edge of the sealing ring (6) is in contact with the inner wall of the outer die head (1), a metal spring piece having the same shape as the sealing ring (6) is arranged inside the sealing ring (6), and the outer edge of the sealing ring (6) is deformed when the cleaning component (3) moves.

5. A PE film blowing mold for making packaging bags according to claim 2, characterized in that: Two square grooves (25) are symmetrically provided on the inner mold core (2), the width of the square grooves (25) being the same as the width of the cleaning block (4), the square grooves (25) being located below the discharge port (23), the trigger groove (24) being located above the end of the spiral flow channel (21), and the trigger groove (24) being connected to the end of the spiral flow channel (21).

6. A PE film blowing mold for making packaging bags according to claim 5, characterized in that: A chamfer is provided at the point where the trigger groove (24) communicates with the spiral flow channel (21), and a chamfer is provided at the edge of the trigger groove (24).

7. A PE film blowing mold for making packaging bags according to claim 6, characterized in that: A locking hole (341) is provided above the rotating buckle (34), and a locking piece (7) is fixedly installed inside the cleaning block (4). The locking piece (7) is made of elastic metal material, and one end of the locking piece (7) is arranged in a cylindrical shape to match the locking hole (341). The horizontal position of the connection between the locking piece (7) and the cleaning block (4) is higher than the locking hole (341).

8. A PE film blowing mold for making packaging bags according to claim 2, characterized in that: An inclined slope (26) is provided inside the trigger groove (24), and the inclined slope (26) is inclined upward from the connection point between the trigger groove (24) and the spiral flow channel (21), and the inclined slope (26) extends to the outer wall of the inner mold core (2).

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