A feeding device for an injection molding machine used for producing plastic cups

Abstract

The present invention provides a material discharge device for an injection molding machine used for the production of plastic cups, which belongs to the field of plastic molding technology, and includes a turntable and a driving assembly, a movable disk is slidably mounted on the turntable, two molds are symmetrically arranged on the movable disk, the mold includes a mold base and an inner mold, a sealed cavity is formed between the mold base and the inner mold, a piston plate is slidably arranged in the sealed cavity; an air inlet channel is opened in the side wall of the mold base, a locking channel 1 and a locking channel 2 are arranged on both sides of the mold base, the locking channels 1 and 2 on the same side of the two mold bases correspond to each other and can be connected, the end of the locking channel 1 is connected to the air inlet channel, and a locking rod is elastically connected in the locking channel 1. The present invention introduces hot air into the sealed cavity of the mold after injection molding, and while heating the preform, the hot air pushes the locking rod in the locking channel 1 to lock the two molds, thereby realizing simultaneous heating and locking.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, and in particular to a material discharge device of an injection molding machine used for producing plastic cups. Background Art

[0002] The injection blow molding process is one of the production processes for manufacturing plastic cups. The specific working process is as follows: first, an injection molding machine forms a parison with a closed bottom, and then the parison is placed in a blow mold, and compressed air is used to blow the parison in the blow mold into a product.

[0003] At present, the common practices in the market are: the first method is to use an integrated injection-blow machine to complete injection molding and blow molding on the injection-blow machine; the second method is to first produce a parison by an injection molding machine, and then transfer it to a blow molding machine for blow molding. For example, the patent document with the announcement number CN112917876B discloses an injection-blow machine with a lifting bottom template. In this injection-blow machine, the raw material forms a parison in the injection molding mechanism, and then is transferred to the mold cavity of the mold assembly through the transfer mechanism, and is blown into a bottle body by the blow molding assembly. The injection-blow machine can complete the injection molding and blow molding processes on one machine, but the equipment is relatively expensive. Some manufacturers of plastic bottles may adopt the second method to produce plastic bottles due to financial constraints or the reuse of old equipment.

[0004] Since the parison after injection molding in the second method needs to be transferred to the blow molding mold and then blow molded by the blow molding machine, the temperature of the parison will drop during the transfer process. It is usually necessary to heat the parison before blow molding to soften the plastic and make it easier to shape and form, thereby improving the quality of blow molding. For example, the patent document with the announcement number CN114889098B discloses a two-station one-step injection-blowing machine, which drives the temperature-increasing holding seat to contact the product shaping frame through a hydraulic cylinder, and then the temperature-increasing holding seat can inject hot air into the inner side of the product injection hole, thereby facilitating the maintenance of the temperature of the injection-molded product, and the hydraulic cylinder drives the blow molding mold seat to contact the product shaping frame, thereby facilitating the blow molding operation. The injection-blowing equipment is used to first perform injection molding, then heat the parison after injection molding, and then place the parison in the blow molding mold. Before blow molding, the blow molding mold needs to be locked before blow molding can be performed. Since the equipment heats the parison before placing it in the blow mold and then clamping the blow mold, heating and clamping are performed separately, which affects the molding efficiency. Summary of the invention

[0005] In view of this, the present invention provides an injection molding machine unloading device for producing plastic cups, which solves the technical problem in the prior art that the heating and mold locking of the injection-molded preform are performed separately, which affects the molding efficiency.

[0006] In order to solve the above technical problems, the present invention provides an injection molding machine unloading device for producing plastic cups, comprising a turntable and a driving assembly for driving the turntable to rotate, a moving disk is slidably mounted on the turntable, two molds are arranged on the moving disk, and the molds include a mold base slidably arranged on the moving disk and an inner mold arranged in the mold base;

[0007] A sealing cavity is formed between the mold base and the inner mold, and a piston plate is provided in the sealing cavity to slide up and down to divide the sealing cavity into an upper sealing area and a lower sealing area. A vent is provided on the upper sealing area, and an exhaust hole is provided on the lower sealing area. A return spring is connected between the lower side of the piston plate and the lower sealing area.

[0008] An air inlet channel is opened in the side wall of the mold base, and the downward movement of the piston plate can connect the air inlet channel with the upper sealing area. Locking channel 1 and locking channel 2 are provided on both sides of the mold base. Locking channel 1 and locking channel 2 on the same side of the two mold bases correspond to each other and can be connected. The end of locking channel 1 is connected with the air inlet channel, and a locking rod that can enter into locking channel 2 is elastically connected in locking channel 1.

[0009] By adopting the above technical solution, the robot transfers the preform after injection molding to the mold, and introduces hot air into the vent. The hot air enters the upper sealing area, which increases the air pressure in the upper sealing area. The air pressure pushes the piston plate downward. As the piston plate moves downward, the volume of the upper sealing area gradually increases, and the volume of the lower sealing area gradually decreases. The gas in the lower sealing area is discharged from the exhaust hole. The upper sealing area is filled with hot air, which can heat the inner mold, and then heat the preform in the mold cavity through heat transfer, which is beneficial to the softening of the preform, thereby improving the quality of blow molding. When the piston plate moves down to connect the air inlet channel with the upper sealing area, the hot air in the upper sealing area enters the air inlet channel, and then enters the clamping channel 1. The air pressure in the clamping channel 1 increases, pushing the clamping rod to move to the clamping channel 2 on the same side of the mold cavity, so that the two inner molds are locked, which is convenient for blow molding. The present invention introduces hot air into the mold after injection molding, and the hot air transfers heat to the preform in the mold, thereby heating the preform. At the same time, the hot air pushes the clamping rod to lock the two molds, thereby realizing synchronous heating and clamping, and improving the molding efficiency.

[0010] Preferably, two locking grooves are provided on the locking rod, and locking grooves connected to the sealing chamber are provided on one side of locking channel one and locking channel two close to the inner mold, and a locking member that can be inserted into the locking groove to lock the locking rod is slidably connected in the locking groove, and an elastic member is connected between the locking member and the inner wall of the locking groove, and the downward movement of the piston plate can push the locking member to be inserted into the locking groove to achieve locking of the locking rod.

[0011] By adopting the above technical solution, after the piston plate moves down to allow hot air to enter the first mold locking channel, the hot air pushes the mold locking rod to lock the two molds. As the piston plate continues to move down, the piston plate pushes the locking member to move along the locking groove to the side close to the mold locking rod until the locking member is stuck in the mold locking groove, locking the mold locking rod, which is beneficial to improve the stability of the mold locking of the mold locking rod. After the locking member locks the mold locking rod, the input of hot air into the upper sealing area can be stopped to seal the vent. The hot air in the upper sealing area keeps the parison warm, which is beneficial to keep the air pressure in the upper sealing area constant, so that the mold locking rod can continue to be in the mold locking state with respect to the inner mold during blow molding.

[0012] Preferably, a first inclined surface is provided on a side of the locking member close to the sealing chamber, and a second inclined surface that can push the first inclined surface to move is provided on the edge of the lower end surface of the piston plate.

[0013] By adopting the above technical solution, as the piston plate descends, the second inclined surface of the piston plate contacts the first inclined surface and pushes the first inclined surface to move toward the side close to the locking rod, thereby causing the locking piece to move along the locking groove toward the side close to the locking rod until the locking piece is stuck in the locking groove, thereby locking the locking rod, which is beneficial to improving the stability of the locking of the locking rod.

[0014] Preferably, a slide rail 1 is provided on the turntable, and the movable disk is slidably mounted on the slide rail 1. A slide rail 2 is provided on the movable disk, and both mold bases are slidably mounted on the slide rail 2. A first linear drive that can drive the movable disk to slide along the slide rail 1 is fixedly mounted on the turntable, and a second linear drive that can push the mold base to move is fixedly mounted on both sides of the movable disk.

[0015] By adopting the above technical solution, the two mold bases can slide along the second slide rail, and the second linear drive drives the two mold bases to move closer or farther from each other, so as to achieve mold locking before blow molding and material unloading after the mold is unlocked after blow molding. The moving plate can slide along the first slide rail, and the first linear drive drives the moving plate to move, so as to cooperate with the robot to place the preform after injection molding in the mold cavity.

[0016] Preferably, four movable disks are evenly distributed on the turntable to form an injection molding station, a heating station, a blow molding station and a unloading station. An injection molding machine is provided on one side of the injection molding station, and a support frame is provided on one side of the heating station. A hot air tank is fixedly connected to the support frame, a hot air rack is slidably connected to the support frame, a hot air cavity is fixedly connected to the hot air rack, a hot air pipe is connected between the hot air tank and the hot air cavity, the hot air pipe is a corrugated pipe, and two nozzles that can be inserted into the vent and input hot air into the vent are provided below the hot air cavity; a first screw lifting mechanism that can drive the hot air rack to rise and fall is installed on the support frame.

[0017] By adopting the above technical solution, after the material is injection molded into a preform in the injection molding machine, it is transferred to the mold on the injection molding station by the manipulator, the turntable drives the mold to rotate to the heating station, the first screw lifting mechanism drives the hot air rack to descend, the hot air rack drives the hot air cavity to descend, so that the two nozzles of the hot air cavity are connected to the vent, and the hot air in the hot air tank enters the hot air cavity through the hot air pipe, and then enters the upper sealing area through the nozzle and the vent in turn, so that the preform is heated while the mold is locked.

[0018] Preferably, the vent has a side wall and a bottom plate, a plug cover is elastically connected to the bottom plate, and a plurality of vent holes are provided on the side wall, and the vent holes can be opened and closed by raising and lowering the plug cover.

[0019] By adopting the above technical solution, after the nozzle presses down the plug cover, the vent hole on the side wall opens, making it easy to inject hot air into the vent hole to achieve heating of the parison and locking of the mold.

[0020] Preferably, a blow molding machine is provided on one side of the blow molding station, and a connecting frame is slidably provided on the blow molding machine. An unlocking rod that can be inserted into the vent is fixedly installed on the connecting frame. The unlocking rod presses the plug cover down to open the vent. The blow molding machine is installed with a second screw lifting mechanism that can drive the connecting frame to rise and fall.

[0021] By adopting the above technical scheme, the turntable drives the mold to rotate to the blow molding station, and the head of the blow molding machine is lowered to perform blow molding. Then, the second screw lifting mechanism drives the connecting frame to descend until the unlocking rod is inserted into the vent, and the unlocking rod presses down the plug cover to open the vent. After the hot air in the upper sealing chamber is output through the vent, the air pressure in the upper sealing chamber is reduced, and the piston plate moves upward under the action of elastic force. In the process of the piston plate moving up, the limit on the locking member is released, and the locking member moves toward the end away from the locking rod under the action of elastic force. The locking member releases the lock of the locking rod. Since the upper sealing chamber is connected with the air inlet channel and the locking channel 1, the air pressure in the upper sealing chamber is reduced, so that the air pressure in the locking channel 1 is also reduced, so that the locking rod is retreated into the locking channel 1 under the action of elastic force, thereby realizing the unlocking of the two inner molds.

[0022] Preferably, a material unloading conveyor belt is provided on one side of the unloading station, and a collection box for collecting the blow-molded plastic cups is provided on the unloading conveyor belt.

[0023] By adopting the above technical solution, after the two inner molds are unlocked, the turntable drives the inner mold to rotate to the unloading station, the second linear drive drives the two mold bases away from each other, and the robot transfers the blow-molded plastic cups to the collection box and transports them through the unloading conveyor belt.

[0024] The beneficial effects of the above technical solution of the present invention are as follows:

[0025] 1. The present invention introduces hot air into the sealed cavity of the mold after injection molding, and the hot air pushes the piston plate down. The heat of the hot air is transferred to the preform in the mold, thereby heating the preform. As the hot air pushes the piston plate down, the air inlet channel is opened, and the hot air enters the air inlet channel and the locking channel one in turn. The hot air pushes the locking rod in the locking channel one to lock the two molds, thereby realizing simultaneous heating and locking, and improving the molding efficiency.

[0026] 2. In the process of the hot gas pushing the piston plate down, the piston plate drives the locking member to move into the locking groove of the locking rod, and the locking member locks the locking rod, which is beneficial to improving the stability of the locking of the locking rod.

[0027] 3. The vent of the present invention has a side wall and a bottom plate, a plug cover is elastically connected to the bottom plate, and a vent hole is opened on the side wall. The vent hole is opened and closed by lifting the plug cover. When inputting or releasing hot air, the nozzle or the unlocking member presses down the plug cover to open the vent hole. After the nozzle inputs gas, it is separated from the plug cover, and the vent hole on the plug cover is lifted and closed, which is beneficial for hot air to keep the preform warm and for maintaining a constant air pressure in the sealed cavity, so that the locking rod continues to keep the inner mold in a locked state during blow molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a material discharge device of an injection molding machine for producing plastic cups of the present invention;

[0029] Figure 2 is a cross-sectional view of a mold of the present invention;

[0030] Figure 3 A longitudinal sectional view of the mold of the present invention;

[0031] Figure 4 A longitudinal sectional view of a mold base of the present invention;

[0032] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0033] Figure 6 It is a structural schematic diagram of the piston plate and the clamping rod of the present invention;

[0034] Figure 7 It is a partial structural schematic diagram of the heating station of the present invention;

[0035] Figure 8 It is a schematic diagram of the partial structure of the blow molding station of the present invention.

[0036] In the figure: 1. turntable; 11. injection molding station; 111. injection molding machine; 12. heating station; 121. support frame; 122. hot air tank; 123. hot air frame; 124. hot air pipe; 125. hot air cavity; 126. nozzle; 127. first screw lifting mechanism; 13. blow molding station; 131. blow molding machine; 132. connecting frame; 133. second screw lifting mechanism; 134. unlocking lever; 14. unloading station; 141. unloading conveyor belt; 142. collection box; 15. first linear drive; 16. slide rail 1; 2. moving Disk; 21, second linear drive; 22, slide rail two; 3, mold; 31, mold base; 311, air inlet channel; 312, air inlet; 313, clamping channel one; 314, clamping channel two; 32, inner mold; 33, mold cavity; 34, sealing cavity; 341, upper sealing area; 342, lower sealing area; 343, vent; 344, bottom plate; 345, side wall; 346, vent hole; 347, plug cover; 348, exhaust hole; 35, piston plate; 36, clamping rod; 361, clamping groove; 362, locking groove; 37, locking piece. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 8 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0038] Example

[0039] This embodiment provides a material discharging device for an injection molding machine used for producing plastic cups, such as Figure 1 As shown, it includes a turntable 1, a manipulator and a drive assembly.

[0040] like Figure 1 As shown, the turntable 1 is rotatably mounted on the frame, and a driving component is disposed below the turntable 1 to drive the turntable 1 to rotate. The driving component is driven by a motor (not shown in the figure).

[0041] like Figure 1 As shown, four movable disks 2 are evenly distributed on the turntable 1 to form an injection molding station 11, a heating station 12, a blow molding station 13 and a material unloading station 14, and two molds 3 are symmetrically arranged on each of the four movable disks 2. Two manipulators are provided, respectively located on one side of the injection molding station 11 and the material unloading station 14 (not marked in the figure).

[0042] like Figure 1As shown, an injection molding machine 111 is provided at one side of the injection molding station 11 . After the material is added into the injection molding machine 111 , the preform molded by the injection molding machine 111 is transferred to the mold 3 on the injection molding station 11 by a robot arm provided at one side of the injection molding station 11 .

[0043] like Figure 1 As shown, the driving assembly drives the turntable 1 to rotate, so that the mold 3 on the injection molding station 11 is transferred to the heating station 12, the blow molding station 13 and the unloading station 14 in sequence. The preform is heated and the mold 3 is locked at the heating station 12. A blow molding machine 131 is provided on one side of the blow molding station 13. The blow molding machine 131 blows the preform into a plastic cup. After the blow molding, the mold 3 is unlocked. The manipulator (not shown in the figure) on one side of the unloading station 14 transfers the molded plastic cup.

[0044] like Figure 1 As shown, the parts of the turntable 1 located at the four stations are all installed with a slide rail 16, which is a linear slide rail, and its length direction extends along the radial direction of the turntable 1. The moving plate 2 is slidably installed on the slide rail 16, and the turntable 1 is fixedly installed with a first linear driver 15 that can drive the moving plate 2 to slide along the slide rail 16.

[0045] like Figure 7 As shown, a second slide rail 22 is fixedly installed above the movable plate 2. The second slide rail 22 is also a linear slide rail, and its length direction is perpendicular to the length direction of the first slide rail 16.

[0046] like Figure 2 and Figure 7 As shown, the mold 3 includes a mold base 31 slidably mounted on the second slide rail 22 and an inner mold 32 arranged in the mold base 31. Two molds 3 are symmetrically arranged on each of the four moving plates 2, that is, two mold bases 31 are slidably mounted on the second slide rail 22. Second linear actuators 21 that can push the two mold bases 31 to move closer to or away from each other are fixedly installed on both sides of the moving plate 2. The first linear actuator 15 and the second linear actuator 21 are both one of a pneumatic cylinder or a hydraulic cylinder.

[0047] like Figure 1 and Figure 7 As shown, by setting the slide rail 1 16 and the slide rail 2 22 , the mold 3 can be moved in two dimensions, which is convenient for adjusting the horizontal position of the mold 3 .

[0048] like Figure 2 As shown, a mold cavity 33 for blow molding is formed between two inner molds 32 on the movable plate 2 .

[0049] like Figure 2 and Figure 3As shown, a sealed cavity 34 is formed between the mold base 31 and the inner mold 32. A piston plate 35 is provided in the sealed cavity 34 to slide up and down. The side of the piston plate 35 abuts against the inner wall of the sealed cavity 34, thereby dividing the sealed cavity 34 into an upper sealed area 341 and a lower sealed area 342.

[0050] like Figure 3 and Figure 4 As shown, the upper sealing area 341 is provided with a vent 343 for introducing or releasing hot air, and the vent 343 has a side wall 345 and a bottom plate 344, a plug cover 347 is elastically connected to the bottom plate 344, and a plurality of vent holes 346 are opened on the side wall 345. When the plug cover 347 is driven by an external force to descend, the vent holes 346 can be opened. After the external force disappears, the plug cover 347 is reset under the action of the elastic force, that is, the plug cover 347 is located above the vent holes 346, and the vent holes 346 are closed.

[0051] like Figure 2 and Figure 3 As shown, a vent hole 348 is provided at the lower portion of the lower sealing area 342 , and a return spring is connected between the lower portion of the piston plate 35 and the bottom of the lower sealing area 342 .

[0052] like Figure 3 As shown, hot air is introduced into the air vent 343, and the hot air enters into the upper sealing area 341, so that the air pressure in the upper sealing area 341 increases, and the air pressure pushes the piston plate 35 to move downward. As the piston plate 35 moves downward, the volume of the upper sealing area 341 gradually increases, and the volume of the lower sealing area 342 gradually decreases. The gas in the lower sealing area 342 is discharged from the exhaust hole 348. The hot air is filled in the upper sealing area 341, which can heat the inner mold 32, and then heat the parison in the mold cavity 33 through heat transfer, which is beneficial to softening the parison, thereby facilitating improving the blow molding quality.

[0053] like Figure 2 and Figure 3 As shown, an air inlet channel 311 is provided in the side wall 345 of the mold base 31, the axis of the air inlet channel 311 is in the up-down direction, an air inlet port 312 communicating with the sealing cavity 34 is provided at the upper end of the air inlet channel 311, and a clamping channel 1 313 and a clamping channel 2 314 are provided on both side walls 345 of the mold base 31, and the clamping channels 1 313 and 314 on the same side of the two mold bases 31 correspond to and can communicate with each other. Specifically, the ends of the clamping channel 1 313 and the clamping channel 2 314 facing each other are both provided with openings, and after the two mold bases 31 are close to and attached to each other, the clamping channel 1 313 and the clamping channel 2 314 are communicated, and the end of the clamping channel 1 313 away from the clamping channel 2 314 is connected to the lower end of the air inlet channel 311. A locking rod 36 is elastically connected to the first locking channel 313 , and the locking rod 36 can enter the second locking channel 314 under the action of air pressure to achieve the locking of the two inner molds 32 .

[0054] like Figure 6 As shown, two locking grooves 361 are provided below the locking rod 36. After the locking rod 36 locks the two inner molds 32, the two locking grooves 361 are located in the locking channel 1 313 and the locking channel 2 314 respectively. Figure 2 and Figure 5 As shown, a locking groove 362 connected to the sealing cavity 34 is provided on the side of the locking channel 1 313 and the locking channel 2 314 close to the inner mold 32. A locking member 37 that can be inserted into the locking groove 361 is slidably connected in the locking groove 362, and an elastic member (not shown in the figure) is connected between the locking member 37 and the inner wall of the locking groove 362. A slope 1 is provided on the side of the locking member 37 close to the sealing cavity 34, and a slope 2 that can push the slope 1 to move is provided on the edge of the lower end surface of the piston plate 35. The downward movement of the piston plate 35 can push the locking member 37 to insert into the locking groove 361 to achieve the locking of the locking rod 36.

[0055] like Figure 3 As shown, when the piston plate 35 moves down to connect the air inlet 312 with the upper sealing area 341, the hot air in the upper sealing area 341 enters the air inlet channel 311 through the air inlet 312, and then enters the clamping channel 1 313, so that the air pressure in the clamping channel 1 313 increases, as shown in FIG. Figure 2 As shown, the air pressure pushes the locking rod 36 to move into the second locking channel 314 on the same side of the mold cavity 33, so that the two inner molds 32 are locked together, which is convenient for blow molding. Figure 5 As shown, as the piston plate 35 continues to move downward, the second bevel of the piston plate 35 contacts the first bevel and pushes the first bevel to move toward the side close to the locking rod 36, thereby causing the locking member 37 to move toward the side close to the locking rod 36 until the locking member 37 is inserted into the locking groove 361, thereby locking the locking rod 36, which is beneficial to improving the stability of the locking of the locking rod 36.

[0056] like Figure 1 and Figure 7 As shown, a support frame 121 is provided on one side of the heating station 12, and a hot gas tank 122 for conveying hot gas into the sealed cavity 34 is fixedly connected to the support frame 121. A hot gas frame 123 is slidably connected to the support frame 121, and a hot gas cavity 125 is fixedly connected to the hot gas frame 123. A hot gas pipe 124 is connected between the hot gas tank 122 and the hot gas cavity 125, and the hot gas pipe 124 is a corrugated pipe. Two nozzles 126 that can be inserted into the vent 343 and input hot gas into the vent 343 are provided below the hot gas cavity 125; a first screw lifting mechanism 127 that can drive the hot gas frame 123 to rise and fall is installed on the support frame 121.

[0057] like Figure 1 and Figure 7As shown, the turntable 1 drives the mold 3 to rotate to the heating station 12, the first screw lifting mechanism 127 drives the hot air rack 123 to descend, and the hot air rack 123 drives the hot air cavity 125 to descend, so that the two nozzles 126 of the hot air cavity 125 press down the plug cover 347, and the vent hole 346 opens. The hot air in the hot air tank 122 enters the hot air cavity 125 through the hot air pipe 124, and then enters the upper sealing area 341 through the nozzle 126 and the vent hole 346 in sequence, so that the preform is heated while the mold 3 is locked.

[0058] After the mold 3 is locked, the input of hot air into the upper sealing area 341 stops, the first screw lifting mechanism 127 drives the hot air rack 123 to rise, the nozzle 126 is separated from the plug cover 347, and the plug cover 347 moves upward under the action of elastic force and seals the vent 346. The hot air in the upper sealing area 341 keeps the preform warm and helps to keep the air pressure in the upper sealing area 341 constant, so that the locking rod 36 continues to keep the inner mold 32 in a locked state during blow molding.

[0059] like Figure 1 and Figure 8 As shown, the turntable 1 drives the mold 3 to rotate to the blow molding station 13. A blow molding machine 131 is provided on one side of the blow molding station 13. A connecting frame 132 is slidably provided on the blow molding machine 131. An unlocking rod 134 that can be extended into the vent 343 is fixedly installed on the connecting frame 132. The unlocking rod 134 presses the plug cover 347 downward to open the vent 346. A second screw lifting mechanism 133 that can drive the connecting frame 132 to rise and fall is installed on the blow molding machine 131.

[0060] The head of the blow molding machine 131 descends to carry out blow molding, and then the second screw lifting mechanism 133 drives the connecting frame 132 to descend until the unlocking rod 134 extends into the vent 343, and the unlocking rod 134 presses the plug cover 347 to open the vent 346. After the hot air in the upper sealed chamber 34 is output through the vent 346, the air pressure in the upper sealed chamber 34 is reduced, and the piston plate 35 moves upward under the action of the elastic force. During the upward movement of the piston plate 35, the limit on the locking member 37 is released, and the locking member 37 moves toward the end away from the locking rod 36 under the action of the elastic force, and the locking member 37 releases the lock of the locking rod 36. Since the upper sealed chamber 34 is connected with the air inlet channel 311 and the locking channel 1 313, the air pressure in the upper sealed chamber 34 is reduced, so that the air pressure in the locking channel 1 313 is also reduced, so that the locking rod 36 is retreated into the locking channel 1 313 under the action of the elastic force, thereby realizing the unlocking of the two inner molds 32.

[0061] like Figure 1As shown, the turntable 1 drives the mold 3 to continue rotating to the unloading station 14. A unloading conveyor belt 141 is provided on one side of the unloading station 14. A collection box 142 for collecting blow-molded plastic cups is provided on the unloading conveyor belt 141. The manipulator on one side of the unloading station 14 transfers the blow-molded plastic cups to the collection box 142, and conveys them through the unloading conveyor belt 141, thereby completing the unloading and transportation of the plastic cups.

[0062] A method for using a blanking device of an injection molding machine for producing plastic cups, comprising the following steps:

[0063] Step 1: After the material is added into the injection molding machine 111, the parison molded by the injection molding machine 111 is transferred to the mold cavity 33 of the mold 3 on the injection molding station 11 by a robot arranged at one side of the injection molding station 11, and the second linear drive 21 drives the two mold bases 31 to approach each other until they fit together;

[0064] Step 2: The driving assembly drives the turntable 1 to rotate, so that the mold 3 on the injection molding station 11 is transferred to the heating station 12 in sequence, and the first screw lifting mechanism 127 drives the hot air rack 123 to descend, and the hot air rack 123 drives the hot air cavity 125 to descend, so that the two nozzles 126 of the hot air cavity 125 press the plug cover 347 downward, and the vent hole 346 opens. The hot air in the hot air tank 122 enters the hot air cavity 125 through the hot air pipe 124, and then passes through the nozzles 126 in sequence. 26. The vent hole 346 enters into the upper sealing area 341, increasing the air pressure in the upper sealing area 341. The air pressure pushes the piston plate 35 downward. As the piston plate 35 moves downward, the volume of the upper sealing area 341 gradually increases, and the volume of the lower sealing area 342 gradually decreases. The gas in the lower sealing area 342 is discharged from the exhaust hole 348. The upper sealing area 341 is filled with hot air, which can heat the inner mold 32, and then heat the parison in the mold cavity 33 through heat transfer.

[0065] Step 3: As the piston plate 35 moves downward, the air inlet channel 311 is connected to the upper sealing area 341, and the hot air in the upper sealing area 341 enters the air inlet channel 311 and then enters the clamping channel 1 313, so that the air pressure in the clamping channel 1 313 increases, and the air pressure pushes the clamping rod 36 to move to the clamping channel 2 314 on the same side of the mold cavity 33, so that the two inner molds 32 are locked, which is convenient for blow molding; as the piston plate 35 continues to move downward, the inclined surface 2 of the piston plate 35 contacts the inclined surface 1 and pushes the inclined surface 1 to move toward the side close to the clamping rod 36, so that the locking member 37 moves toward the side close to the clamping rod 36, until the locking member 37 is stuck in the clamping groove 361, the clamping rod 36 is locked, which is conducive to improving the clamping stability of the clamping rod 36;

[0066] Step 4: After the mold 3 is locked, the hot air input into the upper sealing area 341 is stopped, the first screw lifting mechanism 127 drives the hot air rack 123 to rise, the nozzle 126 is separated from the plug cover 347, and the plug cover 347 moves upward under the action of elastic force and seals the vent 346. The hot air in the upper sealing area 341 keeps the parison warm and helps to keep the air pressure in the upper sealing area 341 constant, so that the locking rod 36 can continue to keep the inner mold 32 in a locked state during blow molding;

[0067] Step 5: The driving assembly drives the turntable 1 to rotate, and the turntable 1 drives the mold 3 to rotate to the blow molding station 13. The head of the blow molding machine 131 descends to perform blow molding. Then, the second screw lifting mechanism 133 drives the connecting frame 132 to descend until the unlocking rod 134 extends into the vent 343. The unlocking rod 134 presses the plug cover 347 downward to open the vent 346. After the hot air in the upper sealed chamber 34 is discharged through the vent 346, the air pressure in the upper sealed chamber 34 is reduced, and the piston plate 35 is elastically moved. The piston plate 35 moves upward, and the limit of the locking member 37 is released during the upward movement. The locking member 37 moves to the end away from the clamping rod 36 under the action of elastic force, and the locking member 37 releases the locking of the clamping rod 36. Since the upper sealing chamber 34 is connected with the air inlet channel 311 and the clamping channel 1 313, the air pressure in the upper sealing chamber 34 is reduced, so that the air pressure in the clamping channel 1 313 is also reduced, so that the clamping rod 36 is retreated into the clamping channel 1 313 under the action of elastic force, thereby realizing the unlocking of the two inner molds 32;

[0068] Step 6: The driving assembly drives the turntable 1 to rotate, and the turntable 1 drives the mold 3 to continue to rotate to the unloading station 14. The second linear drive 21 drives the two mold bases 31 to move away from each other. The robot on one side of the unloading station 14 transfers the blow-molded plastic cups to the collection box 142, and transports them through the unloading conveyor belt 141 to complete the unloading and transportation of the plastic cups.

[0069] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A material discharge device for an injection molding machine for producing plastic cups, comprising a turntable (1) and a driving assembly for driving the turntable (1) to rotate, a moving disk (2) being slidably mounted on the turntable (1), two molds (3) being arranged on the moving disk (2), the molds (3) comprising a mold base (31) slidably arranged on the moving disk (2), and an inner mold (32) arranged in the mold base (31), characterized in that: A sealing cavity (34) is formed between the mold base (31) and the inner mold (32), and a piston plate (35) is provided in the sealing cavity (34) to slide up and down and divide the sealing cavity (34) into an upper sealing area (341) and a lower sealing area (342). The upper sealing area (341) is provided with a vent (343), and the lower sealing area (342) is provided with an exhaust hole (348); a return spring is connected between the lower side of the piston plate (35) and the lower sealing area (342); An air inlet channel (311) is provided in the side wall (345) of the mold base (31). The downward movement of the piston plate (35) can connect the air inlet channel (311) with the upper sealing area (341). A first mold locking channel (313) and a second mold locking channel (314) are provided on both sides of the mold base (31). The first mold locking channel (313) and the second mold locking channel (314) on the same side of the two mold bases (31) correspond to each other and can be connected. The end of the first mold locking channel (313) is connected to the air inlet channel (311). A mold locking rod (36) capable of entering the second mold locking channel (314) is elastically connected to the first mold locking channel (313).

2. The unloading device for an injection molding machine for producing plastic cups according to claim 1, characterized in that: The mold locking rod (36) is provided with two mold locking grooves (361), and a locking groove (362) connected to the sealing chamber (34) is provided on one side of the mold locking channel 1 (313) and the mold locking channel 2 (314) close to the inner mold (32). A locking member (37) is slidably connected in the locking groove (362) and can be inserted into the mold locking groove (361) to lock the mold locking rod (36). An elastic member is connected between the locking member (37) and the inner wall of the locking groove (362). The downward movement of the piston plate (35) can push the locking member (37) to be inserted into the mold locking groove (361) to achieve the locking of the mold locking rod (36).

3. The unloading device for an injection molding machine for producing plastic cups according to claim 2, characterized in that: A first inclined surface is provided on one side of the locking member (37) close to the sealing chamber (34), and a second inclined surface capable of pushing the first inclined surface to move is provided on the edge of the lower end surface of the piston plate (35).

4. The unloading device for an injection molding machine for producing plastic cups according to claim 3, characterized in that: A first slide rail (16) is provided on the turntable (1), the movable disk (2) is slidably mounted on the first slide rail (16), a second slide rail (22) is provided on the movable disk (2), both mold bases (31) are slidably mounted on the second slide rail (22), a first linear actuator (15) capable of driving the movable disk (2) to slide along the first slide rail (16) is fixedly mounted on the turntable (1), and second linear actuators (21) capable of driving the mold base (31) to move are fixedly mounted on both sides of the movable disk (2).

5. The unloading device for injection molding machine used for producing plastic cups according to claim 4, characterized in that: Four movable disks (2) are evenly distributed on the turntable (1) to form an injection molding station (11), a heating station (12), a blow molding station (13) and a material unloading station (14). An injection molding machine (111) is provided on one side of the injection molding station (11), and a support frame (121) is provided on one side of the heating station (12). A hot air tank (122) is fixedly connected to the support frame (121), and a hot air rack (123) is slidably connected to the support frame (121). The hot air rack (123) ) is fixedly connected to a hot air cavity (125), a hot air pipe (124) is connected between the hot air tank (122) and the hot air cavity (125), the hot air pipe (124) is a bellows, and two nozzles (126) are provided below the hot air cavity (125) and can be inserted into the vent (343) and input hot air into the vent (343); a first screw lifting mechanism (127) is installed on the support frame (121) and can drive the hot air frame (123) to move up and down.

6. The unloading device for an injection molding machine for producing plastic cups according to claim 5, characterized in that: The vent (343) comprises a side wall (345) and a bottom plate (344); a plug cover (347) is elastically connected to the bottom plate (344); a plurality of vent holes (346) are provided on the side wall (345); and the vent holes (346) can be opened and closed by lifting and lowering the plug cover (347).

7. The unloading device for an injection molding machine for producing plastic cups according to claim 6, characterized in that: A blow molding machine (131) is provided on one side of the blow molding station (13). A connecting frame (132) is slidably provided on the blow molding machine (131). An unlocking rod (134) capable of extending into the vent (343) is fixedly installed on the connecting frame (132). The unlocking rod (134) presses down the plug cover (347) to open the vent (346). A second screw lifting mechanism (133) capable of driving the connecting frame (132) to move up and down is installed on the blow molding machine (131).

8. The unloading device for injection molding machine used for producing plastic cups according to claim 7, characterized in that: A material unloading conveyor belt (141) is provided on one side of the unloading station (14), and a collection box (142) for collecting blow-molded plastic cups is provided on the unloading conveyor belt (141).

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