Plastic parison conveying device capable of being matched with heating furnace and conveying method

Abstract

The invention discloses a plastic parison conveying device capable of being matched with a heating furnace and a conveying method. A parison feeding manipulator is arranged at a parison feeding station of the heating furnace, a parison feeding station is arranged on one side of the parison feeding manipulator, and a flexible conveying unit is arranged at the parison feeding station; during work, the plastic parisons located in the output area on the flexible conveying unit and the clamping jaw head of the parison feeding mechanical arm are kept at the synchronous running speed, and follow-up conveying of the plastic parisons is achieved. And the blank feeding manipulator can take out the plastic parison which is conveyed by the flexible conveying unit and is in an inverted posture with a downward bottle opening, and transfer the plastic parison in the inverted posture and insert and buckle the plastic parison on a blank inserting head of a blank feeding station of the heating furnace. The plastic parison conveying device has the advantages that plastic parisons can be stably, reliably and efficiently conveyed, and the yield of the plastic parisons in the conveying process of the plastic parisons can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of blow molding a plastic preform into a plastic container, and in particular to a plastic preform conveying device and a conveying method matched with a heating furnace for heating the plastic preform. Background Art

[0002] The common production method for plastic containers (such as bottles) involves heating a plastic preform in a heating furnace, then transferring the heated preform to a blow molding device for blow molding to produce the plastic container. Currently, conventional plastic preforms with a support ring on the neck are conveyed by hanging the support ring on a preform sorting slide and conveying them to the heating furnace. The preforms are then conveyed to the furnace's infeed station, where an in-furnace conveying mechanism is installed to receive the preforms and move them along the furnace's heating channel to the furnace's discharge station. However, for special preforms, such as gallon barrel preforms with a wall thickness greater than 10 mm, the traditional hanging preform conveying method cannot be used because these preforms lack a support ring on the neck. Consequently, there is an urgent need for a plastic preform conveying device and method that can stably, reliably, and efficiently convey these special preforms without a support ring. Summary of the Invention

[0003] The first object of the present invention is to provide a plastic preform conveying device matched with a heating furnace, which can stably, reliably and efficiently convey plastic preforms and can help improve the yield rate of plastic preforms during the conveying process.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a plastic preform conveying device that can be matched with a heating furnace, a preform feeding robot is provided at the preform feeding station of the heating furnace, one side of the preform feeding robot is a preform loading station, and a flexible conveying unit for transporting the plastic preforms to the preform feeding robot is provided at the preform loading station, and the area on the flexible conveying unit that outputs the plastic preforms to the preform feeding robot is the output area. When the preform feeding robot grabs the plastic preforms located in the output area of ​​the flexible conveying unit, the running speed of the plastic preforms located in the output area is synchronized with the running speed of the clamping head of the preform feeding robot that grabs the plastic preforms, thereby realizing follow-up conveyance of the plastic preforms between the two; the preform feeding robot can take out the plastic preforms in an inverted posture with the bottle mouth facing downward in the output area of ​​the flexible conveying unit, and transfer the plastic preforms in an inverted posture and insert them onto the preform insertion head of the preform feeding station of the heating furnace.

[0005] Furthermore, the aforementioned plastic preform conveying device that can be matched with a heating furnace, wherein: the structure of the flexible conveying unit includes: a closed-loop intelligent conveying track controlled by a control unit, on which are arranged several transfer carts that move along the intelligent conveying track, each transfer cart is independently controlled by the control unit, and each transfer cart is equipped with an insertion head for buckling the plastic preform in an inverted posture.

[0006] The cam is provided with an inner ring steering track groove and an outer ring telescopic track groove; the manipulator is provided on the turntable; the manipulator comprises: a mounting portion, the mounting portion is hinged to the edge of the turntable through a vertical axis, one side of the mounting portion extends outward to form a steering portion, a steering roller is provided at the bottom of the steering portion and is rolled and embedded in the inner ring steering track groove; a slide groove radially penetrating the mounting portion is provided on the mounting portion, a telescopic portion that can move freely along the slide groove is slidably connected in the slide groove; a telescopic roller that is rolled and embedded in the outer ring telescopic track groove is provided at the bottom of the telescopic portion; a lifting cylinder is fixed at the outer end portion of the telescopic portion, the piston rod of the lifting cylinder is downwardly facing and is provided with a first parallel air claw, and a first plastic preform clamping portion for clamping the plastic preform is respectively installed on the two clamping claw heads of the first parallel air claw.

[0007] Furthermore, the aforementioned plastic preform conveying device that can be matched with a heating furnace, wherein: a preform discharging robot is provided at the preform discharging station of the heating furnace, and a flipping mechanism is provided on one side of the preform discharging robot, the preform discharging robot is used to take the plastic preform on the preform discharging station of the heating furnace out of the heating furnace and convey the plastic preform to the flipping mechanism; the flipping mechanism is used to receive the plastic preform conveyed by the preform discharging robot, flip the plastic preform into a correct position with the bottle mouth facing upward, and then convey it to the subsequent blow molding device.

[0008] Furthermore, the aforementioned plastic preform conveying device that can be matched with the heating furnace, wherein: the structure of the preform discharging robot is the same as the structure of the preform feeding robot, the structure of the flipping mechanism includes: a rotating disk installed on the machine base and capable of rotating around its own axis, a plurality of plastic preform clamping and flipping units are installed on the rotating disk at intervals along the circumference, and the structure of each plastic preform clamping and flipping unit includes: a swinging cylinder and a second parallel air claw, the cylinder body of the swinging cylinder is connected and fixed to the rotating disk, the cylinder body of the second parallel air claw is installed on the rotating rod shaft of the swinging cylinder, and the two claws of the second parallel air claw are respectively installed with a second plastic preform clamping part for clamping the plastic preform.

[0009] Furthermore, the aforementioned plastic preform conveying device that can be matched with a heating furnace, wherein: one side of the flexible conveying unit is a preform feeding station, a preform feeding device is provided at the preform feeding station, and a plastic preform transfer robot is provided between the preform feeding device and the flexible conveying unit, the preform feeding device conveys the plastic preform to the preform feeding area on the preform feeding device, and the plastic preform transfer robot transfers the plastic preform in the preform feeding area on the preform feeding device to the flexible conveying unit.

[0010] The upper and lower conveyor belts are connected to each other to move the plastic preforms to the upper and lower conveyor belts, respectively, so that the plastic preforms can be transported to the upper and lower conveyor belts at a predetermined interval.

[0011] Furthermore, the aforementioned plastic preform conveying device that can be matched with a heating furnace, wherein: the structure of the flipping drive mechanism includes: a flip cylinder, the cylinder body of the flip cylinder is hinged to the bracket, and the piston rod of the flip cylinder is hinged to the front bottom of the movable support plate.

[0012] Furthermore, the aforementioned plastic preform conveying device that can be matched with the heating furnace, wherein: the structure of the plastic preform transfer robot includes: a mounting frame, a horizontal moving module is arranged in the mounting frame, a translation bracket is installed on the translation motion block of the horizontal moving module, a lifting bracket is arranged on the translation bracket, the lifting bracket is installed on the translation bracket through a lifting drive mechanism, the lifting drive mechanism can drive the lifting bracket to rise or fall, and a plurality of first clamps for clamping the plastic preform are installed on the lifting bracket.

[0013] Furthermore, the aforementioned plastic preform conveying device that can be matched with a heating furnace, wherein: the structure of the lifting drive mechanism includes: a lifting cylinder, the cylinder body of the lifting cylinder is connected to the translation bracket, and the piston rod of the lifting cylinder is connected to the lifting bracket downward.

[0014] A second object of the present invention is to provide a plastic preform conveying method matched with a heating furnace, which can stably, reliably and efficiently convey plastic preforms and can help improve the yield rate of plastic preforms during the conveying process.

[0015] To achieve the above object, the present invention adopts the following technical solution: a plastic preform conveying method matched with a heating furnace, comprising the following steps: S1: The flexible conveying unit transports the plastic preform to the output area of ​​the flexible conveying unit. The preform feeding robot located at the preform feeding station of the heating furnace grabs and takes out the plastic preform in an inverted position with the bottle mouth facing downward located in the output area of ​​the flexible conveying unit. During this process, the running speed of the plastic preform in the output area is synchronized with the running speed of the gripper head of the preform feeding robot that grabs the plastic preform, that is, the plastic preform is conveyed in a follow-up manner between the flexible conveying unit and the preform feeding robot; S2: Then the blank feeding robot continues to transfer the plastic blank in an inverted posture and inserts it onto the blank insertion head of the blank feeding station of the heating furnace.

[0016] Furthermore, in the aforementioned plastic preform conveying method matched with a heating furnace, the flexible conveying unit can buffer a certain number of plastic preforms when in operation.

[0017] Furthermore, the aforementioned method for conveying plastic preforms in conjunction with a heating furnace further comprises: S3: The discharging robot located at the discharging station of the heating furnace grabs and takes out the plastic preform that has been heated in the heating furnace and is sent to the discharging station of the heating furnace in an inverted posture; S4: The plastic preform taken out of the heating furnace in an inverted posture is then turned over so that the plastic preform is in an upright posture with the bottle mouth facing upward, and the plastic preform in the upright posture is then transferred to a subsequent blow molding device.

[0018] Furthermore, the aforementioned method for conveying plastic preforms in conjunction with a heating furnace, wherein: the structure of the flexible conveying unit includes: an intelligent conveying track controlled by a control unit, on which are arranged several transfer carts that move along the intelligent conveying track, each transfer cart is independently controlled by the control unit, and each transfer cart is equipped with an insertion head for buckling plastic preforms in an inverted posture.

[0019] The cam is provided with an inner ring steering track groove and an outer ring telescopic track groove; the manipulator is provided on the turntable; the manipulator comprises: a mounting portion, the mounting portion is hinged to the edge of the turntable through a vertical axis, one side of the mounting portion extends outward to form a steering portion, a steering roller is provided at the bottom of the steering portion and is rolled and embedded in the inner ring steering track groove; a slide groove radially penetrating the mounting portion is provided on the mounting portion, a telescopic portion that can move freely along the slide groove is slidably connected in the slide groove; a telescopic roller that is rolled and embedded in the outer ring telescopic track groove is provided at the bottom of the telescopic portion; a lifting cylinder is fixed at the outer end portion of the telescopic portion, the piston rod of the lifting cylinder is downwardly facing and is provided with a first parallel air claw, and a first plastic preform clamping portion for clamping the plastic preform is respectively provided on the two claws of the first parallel air claw.

[0020] Furthermore, the aforementioned plastic preform conveying method matched with a heating furnace, wherein: in step S4, a flipping mechanism is used to receive the plastic preform conveyed by the ejection robot, and the plastic preform is flipped into a vertical position with the bottle mouth facing upward, and then conveyed to the subsequent blow molding device.

[0021] Furthermore, the aforementioned plastic preform conveying method is matched with a heating furnace, wherein: the structure of the preform discharging robot is the same as the structure of the preform feeding robot; the structure of the flipping mechanism includes: a rotating disk installed on the frame and capable of rotating around its own axis, a plurality of plastic preform clamping and flipping units are installed on the rotating disk at intervals along the circumferential direction, and the structure of each plastic preform clamping and flipping unit includes: a swinging cylinder and a second parallel air claw, the cylinder body of the swinging cylinder is connected and fixed to the rotating disk, the cylinder body of the second parallel air claw is installed on the rotating rod shaft of the swinging cylinder, and the two claws of the second parallel air claw are respectively installed with a second plastic preform clamping part for clamping the plastic preform.

[0022] Furthermore, the aforementioned method for conveying plastic preforms in conjunction with a heating furnace, wherein: in step S1, the preform feeding device conveys the plastic preforms in an inverted posture with the bottle mouth facing downward to the preform feeding area on the preform feeding device, and the plastic preform transfer robot transfers the plastic preforms in the preform feeding area on the preform feeding device, still in an inverted posture with the bottle mouth facing downward, to the flexible conveying unit.

[0023] The upper and lower conveyor belts are connected to each other to move the plastic preforms to the upper and lower conveyor belts, and the lower and lower conveyor belts are connected to each other to move the plastic preforms to the upper and lower conveyor belts.

[0024] Furthermore, the aforementioned method for conveying plastic preforms in conjunction with a heating furnace, wherein: the structure of the plastic preform transfer robot includes: a mounting frame, a horizontal moving module is provided in the mounting frame, a translation bracket is installed on the translation motion block of the horizontal moving module, a lifting bracket is provided on the translation bracket, the lifting bracket is installed on the translation bracket through a lifting drive mechanism, the lifting drive mechanism can drive the lifting bracket to rise or fall, and a plurality of first clamps for clamping the plastic preform are installed on the lifting bracket.

[0025] Through the implementation of the above technical solutions, the beneficial effects of the present invention are as follows: (1) the cooperation between the flexible conveying unit and the blank feeding robot can realize the follow-up transmission of the plastic preforms between the two. In addition, the flexible conveying unit can also cache the plastic preforms, so as to realize the continuous, stable and efficient orderly transmission of the plastic preforms into the heating furnace, thereby improving the transmission efficiency of the plastic preforms; (2) by utilizing the cooperation of the blank feeding device, the plastic preform transfer robot, the flexible conveying unit, the blank feeding robot, the blank discharging robot and the turning mechanism, it is ensured that during the entire process of the plastic preforms being fed into the heating furnace and the blow molding device, the plastic preforms never contact or collide with each other, which not only can the plastic preforms be transported in an orderly, stable and safe manner, thereby improving the flow and transportation efficiency of the plastic preforms, but also can effectively prevent the plastic preforms from being damaged by collision during the transportation process, thereby improving the efficiency of the plastic preforms. The yield rate of the plastic preforms during the transmission process and the yield rate of the finished products after blow molding are improved; (3) the plastic preforms can be sent into the heating furnace in an inverted posture with the bottle mouth facing downward, so that the bottle mouth of the plastic preform will always face downward when the plastic preform is heated in the heating furnace, and the hot air flow in the furnace will always flow upward, which can prevent the bottle mouth from being excessively affected by the upward hot air flow in the heating furnace, prevent the bottle mouth of the plastic preform from overheating and deformation, and better protect the bottle mouth of the plastic preform, thereby ensuring the quality of the plastic preform after heating; (4) the plastic preforms in an inverted posture in the heating furnace can be smoothly taken out, and the plastic preforms can be turned over to an upright posture with the bottle mouth facing upward and then transmitted to the subsequent blow molding device, ensuring smooth production, further ensuring the high quality and efficiency of the plastic preform transmission, and providing plastic preforms in an upright posture for the subsequent blow molding, ensuring the smooth progress of the blow molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the plastic parison conveying device of the present invention that can be matched with a heating furnace.

[0027] Figure 2 This is a schematic diagram of the working status when the movable support plate in the blank feeding device is docked with the upper conveyor belt.

[0028] Figure 3 This is a schematic diagram of the working status when the movable support plate in the blank feeding device is docked with the lower conveyor belt.

[0029] Figure 4 Schematic diagram of the structure of the plastic parison carrier.

[0030] Figure 5 This is a schematic diagram of the working state of the plastic preform transfer robot when it grabs the plastic preform that is transferred to the preform feeding station via the preform feeding device.

[0031] Figure 6 This is a schematic diagram of the working status of the plastic parison transfer robot when it transfers the plastic parison from the parison supply station to the flexible conveying unit.

[0032] Figure 7 It is a schematic diagram of the relative position relationship of the preform feeding device, the plastic preform transfer robot and the flexible conveying unit in the top view.

[0033] Figure 8 This is a schematic diagram of the working state of the blank feeding robot when it grabs the plastic blank conveyed by the flexible conveying unit.

[0034] Figure 9 This is a schematic diagram of the working state of the blank feeding robot when it grabs and lifts the plastic blank conveyed by the flexible conveying unit.

[0035] Figure 10 This is a schematic diagram of the working state when the blank feeding robot transfers the plastic blank to the heating furnace just above the blank insertion head.

[0036] Figure 11 This is a schematic diagram of the working status of the blank feeding robot when it transfers the plastic blank and places it on the blank insertion head of the heating furnace.

[0037] Figure 12 This is a structural diagram of the blank feeding robot in the top view when the other robots are hidden and only one robot is retained.

[0038] Figure 13 This is a schematic diagram of the working status when the ejection robot and the flipping mechanism hand over the plastic preform.

[0039] Figure 14 This is a schematic diagram of the working state of the flip mechanism when it grabs the plastic preform placed in an inverted posture and is handed over to the preform robot.

[0040] Figure 15 This is a schematic diagram of the working state when the flipping mechanism flips the grasped inverted plastic preform into an upright position with the bottle mouth facing upward.

[0041] Figure 16 It is a structural schematic diagram of the flipping mechanism in the top view. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0043] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 As shown, the plastic preform conveying device that can be matched with the heating furnace includes: a preform feeding robot 2 is provided at the preform feeding station of the heating furnace 1, and one side of the preform feeding robot 2 is a preform loading station, and a flexible conveying unit 3 for conveying the plastic preform 100 for the preform feeding robot 2 is provided at the preform loading station, and the area on the flexible conveying unit 3 that outputs the plastic preform 100 to the preform feeding robot 2 is the output area. When the preform feeding robot 2 grabs the plastic preform 100 located in the output area on the flexible conveying unit 3, the running speed of the plastic preform 100 located in the output area is synchronized with the running speed of the preform feeding robot clamping head that grabs the plastic preform 100, thereby realizing follow-up conveyance of the plastic preform between the two; the preform feeding robot 2 can take out the plastic preform 100 in an inverted posture with the bottle mouth facing downward in the output area on the flexible conveying unit 3, and transfer the plastic preform 100 in an inverted posture and insert it into the preform insertion head 111 of the preform feeding station of the heating furnace 1.

[0044] In this embodiment, the flexible conveyor unit 3 comprises a closed-loop intelligent conveyor track 311 controlled by a control unit. Several transfer carts 312 are mounted on the intelligent conveyor track 311, each of which moves along the track. The speed of each transfer cart 312 is independently controlled by the control unit. A blank insertion head 313 is mounted on top of each transfer cart 312 to hold an inverted plastic preform 100. The intelligent conveyor track and transfer carts in the flexible conveyor unit 2 of this invention utilize a magnetically driven flexible conveyor system manufactured by Beckhoff, and therefore will not be described in detail here. Each transfer cart 312 is equipped with a blank insertion head 313. In this embodiment, see Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12As shown, the structure of the blank feeding robot 2 includes: a cam 212 fixedly mounted on the support, and a turntable 213 arranged above the cam 212, the turntable 213 is driven to rotate by the turntable driving mechanism, and the turntable driving mechanism can be adopted by setting a driven sprocket on the central axis of the turntable 213, installing a motor on the support, installing a driving sprocket on the output shaft of the motor, and winding a chain between the driving sprocket and the driven sprocket. The motor drives the turntable 213 to rotate through the cooperation of the driving sprocket, the driven sprocket and the chain; an inner ring steering track groove 214 and an outer ring telescopic track groove 215 are provided on the cam 212, and a There is a manipulator 216, which includes: a mounting portion 217, the mounting portion 217 is hinged to the edge of the turntable 213 through a vertical axis 218, the mounting portion 217 extends outward from the lower side to form a steering portion 219, a steering roller 220 is provided at the bottom of the steering portion 219 and is rolled and embedded in the inner ring steering track groove 214, a slide groove is provided on the mounting portion 217 which radially passes through the mounting portion 217, a telescopic portion 221 that moves freely along the slide groove is slidably connected in the slide groove, a telescopic roller 222 that is rolled and embedded in the outer ring telescopic track groove 215 is provided at the bottom of the telescopic portion 221, and a telescopic roller 222 is fixed on the outer end of the telescopic portion 221. The lifting cylinder 223 has a piston rod facing downward and is equipped with a first parallel air claw 224. The two clamping claws of the first parallel air claw 224 are respectively equipped with a first plastic preform clamping portion 225 for clamping the plastic preform 100; the above-mentioned preform feeding robot has a simple structure, convenient and stable operation, and cooperates with the flexible conveying unit 3 when working, so that the running speed of the plastic preform 100 in the output area of ​​the flexible conveying unit 3 is synchronized with the running speed of the clamping claw head of the preform feeding robot 2 that grabs the plastic preform 100, thereby realizing the follow-up transmission of the plastic preform 100 between the flexible conveying unit 3 and the preform feeding robot 2, so that the plastic preform 100 can be transported in a continuous manner. The blank feeding robot can smoothly and orderly grab the plastic preforms 100 conveyed by the flexible conveying unit, thereby realizing the continuous, smooth, efficient and orderly conveying of the plastic preforms into the heating furnace, which not only improves the conveying efficiency of the plastic preforms, but also prevents the plastic preforms from colliding with each other and being damaged during the conveying process, thereby improving the yield rate of the plastic preforms during the transmission process; in addition, since the operating speed of each transfer trolley 312 in the flexible conveying unit 3 can be independently controlled, a certain number of plastic preforms 100 can be cached in the flexible conveying unit 3, thereby further improving the conveying efficiency of the entire plastic preform conveying device and broadening its application scenarios.

[0045] In this embodiment, a preform discharging robot 4 is provided at the preform discharging station of the heating furnace 1, and a turning mechanism 5 is provided on one side of the preform discharging robot 4. The preform discharging robot 4 is used to take the plastic preform 100 on the preform discharging station of the heating furnace 1 out of the heating furnace 1 and convey the plastic preform 100 to the turning mechanism 5. The structure of the preform discharging robot 4 is the same as that of the preform feeding robot 2. The turning mechanism 5 is used to receive the plastic preform 100 conveyed by the preform discharging robot 4, turn the plastic preform 100 into a right position with the bottle mouth facing upward, and then convey it to the subsequent blow molding device 6; See also Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 As shown, the structure of the flip mechanism 5 includes: a rotating disk 512 installed on the machine base and capable of rotating around its own axis; the rotating disk driving mechanism can be adopted by setting a driven sprocket on the central axis of the rotating disk 512, installing a motor on the support, installing a driving sprocket on the output shaft of the motor, and winding a chain between the driving sprocket and the driven sprocket. The motor drives the rotating disk to rotate through the cooperation of the driving sprocket, the driven sprocket and the chain; a plurality of plastic preform clamping and flipping units are installed on the rotating disk 512 at intervals along the circumference, and the structure of each plastic preform clamping and flipping unit includes: a swing cylinder 513 and a second parallel air claw 514, and the cylinder body of the swing cylinder 513 is connected to the rotating disk 512 The cylinder body of the second parallel air gripper 514 is fixed, and is installed on the rotating rod shaft of the swing cylinder 513. The second plastic preform clamping part 515 for clamping the plastic preform 100 is respectively installed on the two claws of the second parallel air gripper 514; through the structural design and action coordination of the blank ejecting robot and the flipping mechanism, the plastic preform in an inverted posture in the heating furnace can be smoothly taken out, and the plastic preform can be flipped into an upright posture with the bottle mouth facing up and then transmitted to the subsequent blow molding device, which ensures the stable, reliable, high-quality and efficient transmission of the plastic preform during the heating process of the plastic preform, and can provide the plastic preform 100 in an upright posture for the subsequent blow molding of the plastic preform, thereby ensuring the smooth progress of the blow molding process.

[0046] In this embodiment, one side of the flexible conveying unit 3 is a blank feeding station, at which a blank feeding device 7 is provided, and a plastic blank transfer robot 8 is provided between the blank feeding device 7 and the flexible conveying unit 3. The blank feeding device 7 conveys the plastic blank 100 to the blank feeding area on the blank feeding device 7, and the plastic blank transfer robot 8 transfers the plastic blank 100 in the blank feeding area on the blank feeding device 7 to the flexible conveying unit 3.

[0047] In this embodiment, see Figure 2 、 Figure 3 、 Figure 4As shown, the structure of the blank feeding device 7 includes: a plastic preform carrier 711, an upper conveyor belt 712 and a lower conveyor belt 713; a plurality of placement portions 714 for placing plastic preforms 100 are evenly spaced on the plastic preform carrier 711; in actual application, the placement portion 714 of the plastic preform carrier 711 can be a slot recessed downwardly on the upper surface of the plastic preform carrier or a protrusion protruding upwardly from the upper surface of the plastic preform carrier; in this embodiment, the placement portion 714 of the plastic preform carrier 711 is a protrusion protruding upwardly from the upper surface of the plastic preform carrier, and the outer peripheral surface of the protrusion is a conical surface with a diameter gradually increasing from top to bottom, which facilitates the rapid, accurate and stable placement of the plastic preform on the placement portion, thereby improving work efficiency.

[0048] The lower conveyor belt 713 is located below the upper conveyor belt 712. A movable support plate 715 located in the blank feeding area is provided on the output end side of the upper conveyor belt 712. The movable support plate 715 is provided on a bracket 716. The end of the movable support plate close to the output end of the upper conveyor belt is defined as the front end, and the end of the movable support plate away from the output end of the upper conveyor belt is defined as the rear end. The rear end of the movable support plate 715 is hinged to the bracket 716 through a rotating shaft 717. A flip driving mechanism that can push the movable plate support 715 to flip up and down around the rotating shaft 717 is provided between the front end of the movable support plate 715 and the bracket 716. The movable support plate 715 can be flipped upward to the same position as the upper conveyor belt under the drive of the flip driving mechanism. The output end of the upper conveyor belt 712 is connected, or can be turned downward to connect with the input end of the lower conveyor belt 713; the structure of the turning drive mechanism includes: a turning cylinder 718, the cylinder body of the turning cylinder 718 is hinged to the bracket 716, and the piston rod of the turning cylinder 718 is hinged to the front bottom of the movable support plate 715; when the piston rod of the turning cylinder 718 extends outward, it can drive the movable support plate 715 to turn upward around the rotating shaft 717 to connect with the output end of the upper conveyor belt 712, and when the piston rod of the turning cylinder 718 retracts inward, it can drive the movable support plate 715 to turn downward around the rotating shaft 717 to connect with the input end of the lower conveyor belt 713.

[0049] In this embodiment, if Figure 5 、 Figure 6 、 Figure 7As shown, the structure of the plastic parison transfer robot 8 includes: a mounting frame 811, a horizontal moving module 812 is provided in the mounting frame 811, and the horizontal moving module 812 adopts a motor, a screw and a translation motion block matching structure; the horizontal moving module 812 can be directly purchased on the market; a translation bracket 813 is installed on the translation motion block of the horizontal moving module 812, and a lifting bracket 814 is provided on the translation bracket 813. The lifting bracket 814 is installed on the translation bracket 813 through a lifting drive mechanism, and the lifting drive mechanism can drive The lifting bracket 814 rises or falls, and a plurality of first clamping claws 815 for clamping the plastic preform 100 are installed on the lifting bracket 814; in this embodiment, the structure of the lifting drive mechanism includes: a lifting cylinder 816, the cylinder body of the lifting cylinder 816 is connected to the translation bracket 813, and the piston rod of the lifting cylinder 816 is connected to the lifting bracket 814 downward; through the structural design of the preform feeding device and the plastic preform transfer robot, the plastic preform can be continuously and stably supplied to the flexible conveying unit, ensuring continuous and orderly production.

[0050] like Figure 1 As shown, a method for conveying plastic preforms in conjunction with a heating furnace, using the above-mentioned plastic preform conveying device, specifically includes the following steps: S1: S1.1: The preform feeding device continuously and orderly transports the plastic preforms in an inverted posture with the bottle mouth facing downward to the preform feeding area on the preform feeding device.

[0051] In this embodiment, if Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, the structure of the blank feeding device 7 includes: a plastic blank carrier 711, an upper conveyor belt 712 and a lower conveyor belt 713; a plurality of placement portions 714 for placing plastic blanks 100 are evenly spaced on the plastic blank carrier 7; in actual application, the placement portions 714 of the plastic blank carrier 711 can be slots recessed downwardly on the upper surface of the plastic blank carrier or protruding portions protruding upwardly from the upper surface of the plastic blank carrier; in this embodiment, the placement portions 714 of the plastic blank carrier 711 are upwardly protruding portions. The protrusion on the upper surface of the plastic preform carrier, and the outer peripheral surface of the protrusion is a conical surface with a diameter gradually increasing from top to bottom, which makes it easy for the plastic preform to be quickly, accurately and firmly buckled into the placement part, thereby improving work efficiency; the lower conveyor belt 713 is located below the upper conveyor belt 712, and a movable support plate 715 located in the blank feeding area is provided on the output end side of the upper conveyor belt 712. The movable support plate 715 is provided on the bracket 716, and the end of the movable support plate close to the output end of the upper conveyor belt is defined as the front end, away from the front end. The end of the movable support plate at the output end of the upper conveyor belt is the rear end, and the rear end of the movable support plate 715 is hinged to the bracket 716 through the rotating shaft 717. A turning drive mechanism that can push the movable plate support 715 to turn up and down around the rotating shaft 717 is provided between the front end of the movable support plate 715 and the bracket 716. The movable support plate 715 can be turned upward to connect with the output end of the upper conveyor belt 712, or can be turned downward to connect with the input end of the lower conveyor belt 713 under the drive of the turning drive mechanism. The structure includes: a flip cylinder 718, the cylinder body of the flip cylinder 718 is hinged to the bracket 716, and the piston rod of the flip cylinder 718 is hinged to the front end bottom of the movable support plate 715; when the piston rod of the flip cylinder 718 extends outward, it can drive the movable support plate 715 to flip upward around the rotating shaft 717 to connect with the output end of the upper conveyor belt 712; when the piston rod of the flip cylinder 718 retracts inward, it can drive the movable support plate 715 to flip downward around the rotating shaft 717 to connect with the input end of the lower conveyor belt 713.

[0052] The specific process of the blank feeding device 7 transporting the plastic blanks 100 to the blank feeding area in an inverted posture with the bottle mouth facing downward in an interval arrangement is as follows: First, the plastic preform 100 is placed in an inverted posture with the bottle mouth facing downward in the placement part 714 of the plastic preform carrier 711 of the preform feeding device 7. It is defined that each placement part 714 corresponds to a plastic preform carrier 711 with an inverted plastic preform 100 placed therein is a full bottle plastic preform carrier, and the plastic preform carrier 711 without a plastic preform 100 placed in each placement part 714 is an empty bottle plastic preform carrier; and in the initial state, the piston rod of the turning cylinder 718 of the preform feeding device 7 is in an extended state, and at this time the movable support plate 715 is connected to the upper conveyor belt 712.

[0053] Then, the full bottle plastic preform carrier 711 is placed on the upper conveyor belt 712, and the upper conveyor belt 712 moves the full bottle plastic preform carrier 711 toward the preform supply area until the full bottle plastic preform carrier is located on the movable support plate 715. At this time, the full bottle plastic preform carrier 711 is located in the preform supply area, so that the plastic preforms are arranged at intervals and transported to the preform supply area in an inverted posture with the bottle mouth facing downward.

[0054] As the plastic preforms 100 in the full-bottle plastic preform carrier 711 are continuously transferred to the flexible conveying unit 3 by the plastic preform transfer robot 8, when all the plastic preforms 100 on the full-bottle plastic preform carrier 711 are removed and become an empty-bottle plastic preform carrier, the piston rod of the flip cylinder 718 retracts inward, driving the movable support plate 715 to flip downward around the rotating shaft 717 until it is connected to the input end of the lower conveyor belt 713. At this time, the empty-bottle plastic preform carrier will slide down along the inclined movable support plate 715 into the lower conveyor belt 713 and be output by the lower conveyor belt 713.

[0055] Then, the piston rod of the tilting cylinder 718 is extended outward and reset, so that the movable support plate 715 continues to be connected to the upper conveyor belt 712 to receive the full bottle plastic preform carrier 711 output by the upper conveyor belt 712.

[0056] Since the plastic preforms 100 are always arranged at intervals during the feeding process, that is, adjacent plastic preforms 100 do not contact each other, and the plastic preforms 100 are always conveyed in an inverted posture with the bottle mouth facing downward, the plastic preforms 100 can be effectively prevented from being damaged by collision during the conveying process, thereby improving product quality.

[0057] S1.2: Use the plastic preform transfer robot 8 arranged between the preform feeding device 7 and the flexible conveying unit 3 to transfer the plastic preforms 100 located in the preform feeding area of ​​the preform feeding device 7 to the flexible conveying unit 3 one by one or in groups with the bottle mouth facing downward.

[0058] In this embodiment, if Figure 5 、 Figure 6 、 Figure 7As shown, the structure of the plastic preform transfer robot 8 includes: a mounting frame 811, in which a horizontal moving module 812 is provided, and the horizontal moving module 812 adopts a structure coordinated with a motor, a screw and a translational motion block; a translation bracket 813 is installed on the translational motion block of the horizontal moving module 812, and a lifting bracket 814 is provided on the translation bracket 813. The lifting bracket 814 is installed on the translation bracket 813 through a lifting drive mechanism, and the lifting drive mechanism can drive the lifting bracket 814 to rise or fall. A plurality of first clamping claws 815 for clamping the plastic preform 100 are installed on the lifting bracket 814; in this embodiment, the structure of the lifting drive mechanism includes: a lifting cylinder 816, the cylinder body of the lifting cylinder 816 is connected to the translation bracket 813, and the piston rod of the lifting cylinder 816 is connected to the lifting bracket 814 downward.

[0059] The process of the plastic preform transfer robot 8 transferring the plastic preforms 100 located in the preform feeding area of ​​the preform feeding device 7 to the flexible conveying unit 3 one by one or in groups in an inverted posture with the bottle mouth facing downward is as follows: First, each first clamping jaw 815 is opened and aligned with the plastic preform 100 in the full bottle plastic preform carrier 711 located in the preform feeding area. Then, the horizontal moving module 812 drives the translation bracket 813 and each first clamping jaw 815 to move toward the plastic preform 100 in the full bottle plastic preform carrier 711 located in the preform feeding area until each first clamping jaw 815 grabs the plastic preform 100.

[0060] Then the lifting cylinder 816 is actuated to lift each of the first clamping jaws 815 , and simultaneously lift the plastic preform 100 clamped by the first clamping jaws 815 , so that the plastic preform 100 is separated from the plastic preform carrier 711 .

[0061] Then the horizontal moving module 812 drives the translation bracket 813 and the first clamping claw 815 holding the plastic preform 100 to move toward the flexible conveying unit 3 until the plastic preform 100 clamped by the first clamping claw 815 is located just above the insertion head 313 of the transfer trolley 312 of the flexible conveying unit 3. Then the lifting cylinder 816 is actuated to drive the first clamping claw 815 to descend, and synchronously drive the plastic preform 100 clamped by the first clamping claw 815 to descend, thereby inserting the plastic preform 100 into the corresponding transfer trolley. The blank insertion head 313 of the vehicle 312 realizes the transfer of the plastic preforms 100 in the blank supply area to the flexible conveying unit 3 one by one or in groups while maintaining an inverted posture. When the number of the first clamping jaws 815 of the plastic preform transfer robot 8 is one, the plastic preforms 100 are transferred one by one. When the number of the first clamping jaws 815 of the plastic preform transfer robot 8 is multiple, the plastic preforms 100 are transferred in groups. When transferring in groups, each plastic preform also always maintains an inverted posture and adjacent plastic preforms do not touch each other.

[0062] S1.3: The flexible conveying unit 3 transports the plastic preform 100 to the output area on the flexible conveying unit 3, and the preform feeding robot 2 located at the preform feeding station of the heating furnace grabs and takes out the plastic preform 100 in an inverted posture with the bottle mouth facing downward located in the output area of ​​the flexible conveying unit 3. During this process, the running speed of the plastic preform 100 located in the output area of ​​the flexible conveying unit 3 is synchronized with the running speed of the clamping claw head of the preform feeding robot 2 that grabs the plastic preform 100, that is, the follow-up conveying of the plastic preform is realized between the flexible conveying unit 3 and the preform feeding robot 2.

[0063] In this embodiment, the structure of the flexible conveying unit 3 includes: a closed-loop intelligent conveying track 311 controlled by a control unit, and a plurality of transfer carts 312 that move along the intelligent conveying track 311 are arranged on the intelligent conveying track 311. The running speed of each transfer cart 312 is independently controlled by the control unit, and an insertion head 313 for placing the plastic preform 100 is installed on the top of each transfer cart 312; the intelligent conveying track and transfer cart and other structures in the flexible conveying unit 2 of the present invention adopt the magnetic drive flexible conveying system manufactured by Beckhoff, so they are not repeated here; the present invention provides an insertion head 313 on the transfer cart 312.

[0064] After the transfer trolley 312 in the flexible conveying unit 3 receives the inverted plastic preform 100 output by the plastic preform transfer robot 8 through its blank insertion head 313, since the running speed of each transfer trolley 312 in the flexible conveying unit 3 can be independently controlled, a certain number of plastic preforms 100 can be buffered in the flexible conveying unit 3, thereby further improving the conveying efficiency of the entire plastic preform conveying device and broadening its application scenarios.

[0065] S2: Then the blank feeding robot 2 continues to transfer the plastic blank in an inverted posture and inserts it onto the blank insertion head 111 of the blank feeding station of the heating furnace 1.

[0066] In this embodiment, if Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12As shown, the structure of the blank feeding robot 2 includes: a cam 212 fixedly mounted on the support, and a turntable 213 arranged above the cam 212, the turntable 213 is driven to rotate by the turntable driving mechanism, and the turntable driving mechanism can be adopted by setting a driven sprocket on the central axis of the turntable 213, installing a motor on the support, installing a driving sprocket on the output shaft of the motor, and winding a chain between the driving sprocket and the driven sprocket. The motor drives the turntable 213 to rotate through the driving sprocket, the driven sprocket and the chain; an inner ring steering track groove 214 and an outer ring telescopic track groove 215 are provided on the cam 212, and a robot 216 is provided on the turntable 213, and the robot 216 includes: a mounting portion 217, and the mounting portion 217 is hinged to the The edge of the turntable 213 and the lower side of the mounting portion 217 extend outward to form a steering portion 219. A steering roller 220 that is rolled and embedded in the inner ring steering track groove 214 is provided at the bottom of the steering portion 219. A sliding groove that radially penetrates the mounting portion 217 is provided on the mounting portion 217. A telescopic portion 221 that moves freely along the sliding groove is slidably connected in the sliding groove. A telescopic roller 222 that is rolled and embedded in the outer ring telescopic track groove 215 is provided at the bottom of the telescopic portion 221. A lifting cylinder 223 is fixed to the outer end of the telescopic portion 221. The piston rod of the lifting cylinder 223 faces downward and is installed with a first parallel air gripper 224. The two clamping heads of the first parallel air gripper 224 are respectively installed with a first plastic preform clamping portion 225 for clamping the plastic preform 100.

[0067] During operation, the manipulator 216 rotates with the turntable 213. During the rotation of the manipulator 216 with the turntable 213, the manipulator 216 is turned by moving the steering roller 220 of the steering portion 219 along the inner ring steering track groove 214, so that the manipulator 216 can be at an angle convenient for handing over the plastic preform when handing over the plastic preform; at the same time, the manipulator 216 is moved by moving the telescopic roller 222 of the telescopic portion 221 along the outer ring telescopic track groove 215, so that the manipulator 216 can be at a position convenient for handing over the plastic preform 100 when handing over the plastic preform 100.

[0068] The specific process of the blank feeding robot 2 taking the plastic preforms 100 from the output area of ​​the flexible conveying unit 3 and transferring the plastic preforms 100 one by one in an inverted posture to the blank insertion head 111 of the blank feeding station of the heating furnace 1 is as follows: After the manipulator 216 in the blank feeding manipulator 2 rotates with the turntable 213 to the corresponding blank insertion head 313 in the output area of ​​the flexible conveying unit 3, the running speed of the blank insertion head 313 located in the output area is synchronized with the running speed of the first parallel air claws 224 of the manipulator 216. The first parallel air claws 224 of the manipulator 216 will control its pair of first plastic blank clamping parts 225 to grab the plastic blank 100 that is now buckled on the corresponding blank insertion head 313. Then the lifting cylinder 223 of the manipulator 216 drives the first parallel air claws 224 to move upward, and synchronously drives the plastic blank 100 clamped by the first plastic blank clamping part 225 to move upward until the plastic blank 100 is separated from the blank insertion head 313 of the corresponding transfer cart 312 of the flexible conveying unit 3.

[0069] Then the manipulator 216 continues to rotate with the turntable 213 to just above the heating furnace blank insertion head 111 of the heating furnace 1 located at the blank feeding station, and then the lifting cylinder 223 drives the first parallel air claw 224 to move downward, and simultaneously drives the plastic blank 100 clamped by the first plastic blank clamping part 225 to move downward until the plastic blank 100 is buckled on the corresponding heating furnace blank insertion head 111 of the heating furnace 1, and then the first parallel air claw 224 controls the first plastic blank clamping part 225 to release the plastic blank 100, thereby taking the plastic blank 100 out of the flexible conveying unit 3 and transporting the plastic blanks 100 one by one to the blank feeding station of the heating furnace 1 while maintaining an inverted posture.

[0070] The heating furnace 1 keeps the plastic preform 100 in an inverted position and conveys it along a circular conveying trajectory from the preform feeding station to the preform discharging station. During this conveying process, the heating furnace 7 heats the inner wall of the plastic preform 100 from the inside of the plastic preform 100 and simultaneously heats the outer wall of the plastic preform 100 from the outside of the plastic preform 100, thereby completing the heating of the plastic preform 100.

[0071] S3: The discharging robot 4 located at the discharging station of the heating furnace grabs and takes out the plastic preform 100 which has been heated in the heating furnace 1 and is sent to the discharging station of the heating furnace in an inverted posture; In this embodiment, the structure of the blank ejecting robot 4 is the same as that of the blank feeding robot 2; Figure 13 、 Figure 14 、 Figure 15 、 Figure 16As shown, the structure of the flipping mechanism 5 includes: a rotating disk 512 installed on the machine base and capable of rotating around its own axis, the rotating disk driving mechanism can adopt a driven sprocket set on the central axis of the rotating disk 512, a motor installed on the support, a driving sprocket installed on the output shaft of the motor, a chain wound between the driving sprocket and the driven sprocket, and the motor drives the rotating disk to rotate through the cooperation of the driving sprocket, the driven sprocket and the chain; a plurality of plastic preform clamping and flipping units are installed on the rotating disk 512 at intervals along the circumferential direction, and the structure of each plastic preform clamping and flipping unit includes: a swing cylinder 513 and a second parallel air claw 514, the cylinder body of the swing cylinder 513 is connected and fixed to the rotating disk 512, the cylinder body of the second parallel air claw 514 is installed on the rotating rod shaft of the swing cylinder 513, and the two claws of the second parallel air claw 514 are respectively equipped with a second plastic preform clamping part 515 for clamping the plastic preform 100.

[0072] The process in which the ejection robot 4 takes out the plastic preforms 100 from the ejection station of the heating furnace 1 one by one is as follows: After the manipulator 216 in the blank ejecting robot 4 rotates to the blank ejecting station with the turntable 213, the first parallel air claws 224 of the manipulator 216 will control its pair of first plastic preform clamping parts 225 to grab the plastic preform 100 transported to the blank ejecting station through the heating furnace 1, and then the lifting cylinder 223 of the manipulator 216 drives the first parallel air claws 224 to move upward, and simultaneously drives the plastic preform 100 clamped by the first plastic preform clamping parts 225 to move upward until the plastic preform 100 is separated from the corresponding heating furnace blank insertion head 111 of the heating furnace 1; then the manipulator 216 continues to rotate with the turntable 213, thereby taking the plastic preform 100 at the blank ejecting station out of the heating furnace 1 and conveying the plastic preform 100 to the flipping mechanism 5 in an inverted posture.

[0073] S4: The turning mechanism 5 then turns over the plastic preform taken out of the heating furnace in an inverted posture, so that the plastic preform is in an upright posture with the bottle mouth facing upward, and then transfers the plastic preform in the upright posture to the subsequent blow molding device 6; The process in which the turning mechanism 5 receives the plastic preform 100 conveyed by the ejection robot 4 and turns the inverted plastic preform 100 into an upright position with the bottle mouth facing upward and then conveys it to the blow molding device 6 is as follows: The second parallel air claws 514 in the plastic preform clamping and flipping unit of the flipping mechanism 5 that transfers the plastic preform to the ejection robot 4 controls its pair of second plastic preform clamping parts 515 to clamp the plastic preform 100 transferred by the robot 216 of the ejection robot 4; and then makes the robot 216 of the ejection robot 4 that transfers the plastic preform to the flipping mechanism 6 release the transferred plastic preform 100.

[0074] Then, the plastic preform clamping and turning unit in the turning mechanism 5 that completes the handover of the plastic preform with the discharging robot 4 continues to rotate with the rotating disk 512 through the turning area. During the process of the plastic preform clamping and turning unit passing through the turning area, the swing cylinder 513 in the plastic preform clamping and turning unit is actuated to drive the second parallel air claws 514 and the plastic preform 100 clamped by the second plastic preform clamping part 515 to turn 180°, so that the plastic preform is turned from an inverted posture to an upright posture with the bottle mouth facing up; after the plastic preform clamping and turning unit turns the plastic preform to the upright posture, the plastic preform clamping and turning unit continues to rotate with the rotating disk 512 toward the blow molding device 6, thereby conveying the plastic preform 100 in the upright posture to the blow molding device 6.

[0075] The advantages of the present invention are: (1) the cooperation between the flexible conveying unit and the blank feeding robot can realize the follow-up transmission of the plastic preforms between the two. In addition, the flexible conveying unit can also cache the plastic preforms, so as to realize the continuous, stable and efficient orderly transmission of the plastic preforms into the heating furnace, thereby improving the transmission efficiency of the plastic preforms; (2) by utilizing the cooperation of the blank feeding device, the plastic preform transfer robot, the flexible conveying unit, the blank feeding robot, the blank discharging robot and the turning mechanism, it is ensured that during the entire process of the plastic preforms being fed into the heating furnace and the blow molding device, the plastic preforms never contact or collide with each other. Not only can the plastic preforms be transported in an orderly, stable and safe manner, thereby improving the flow and transportation efficiency of the plastic preforms, but also the plastic preforms can be effectively prevented from being damaged by collision during the transportation process, thereby improving the plastic preforms in the transportation process. The yield rate of the raw material preform and the yield rate of the finished product after blow molding; (3) the plastic preform can be sent into the heating furnace in an inverted posture with the bottle mouth facing downward, so that the bottle mouth of the plastic preform will always face downward when the plastic preform is heated in the heating furnace, and the hot air flow in the furnace will always flow upward, which can prevent the bottle mouth from being excessively affected by the upward hot air flow in the heating furnace, prevent the bottle mouth of the plastic preform from overheating and deformation, and better protect the bottle mouth of the plastic preform, thereby ensuring the quality of the plastic preform after heating; (4) the plastic preform in an inverted posture in the heating furnace can be smoothly taken out, and the plastic preform can be turned over to an upright posture with the bottle mouth facing upward and then sent to the subsequent blow molding device, ensuring smooth production, further ensuring the high quality and efficiency of the plastic preform transmission, and providing the plastic preform in an upright posture for the subsequent blow molding, ensuring the smooth progress of the blow molding process.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention shall still fall within the scope of protection required by the present invention.

Claims

1. A plastic parison conveying device that can be used in conjunction with a heating furnace, characterized in that: A billet feeding robot is provided at the billet feeding station of the heating furnace, and one side of the billet feeding robot is the billet loading station, and a flexible conveying unit for transporting the plastic billets to the billet feeding robot is provided at the billet loading station. The area on the flexible conveying unit that outputs the plastic billets to the billet feeding robot is the output area. When the billet feeding robot grabs the plastic billet located in the output area of ​​the flexible conveying unit, the running speed of the plastic billet located in the output area is synchronized with the running speed of the clamping head of the billet feeding robot that grabs the plastic billet, thereby realizing follow-up conveyance of the plastic billet between the two; the billet feeding robot can take out the plastic billet in the output area on the flexible conveying unit in an inverted posture with the bottle mouth facing downward, and transfer the plastic billet in an inverted posture and insert it onto the billet insertion head of the billet feeding station of the heating furnace.

2. The plastic parison conveying device that can be matched with a heating furnace according to claim 1, characterized in that: The structure of the flexible conveying unit includes: a closed-loop intelligent conveying track controlled by a control unit, on which are arranged several transfer trolleys that move along the intelligent conveying track. Each transfer trolley is independently controlled by the control unit, and each transfer trolley is equipped with an insertion head for holding the plastic preform in an inverted posture.

3. The plastic parison conveying device that can be matched with a heating furnace according to claim 1, characterized in that: The structure of the billet feeding robot includes: a cam fixedly mounted on a support, and a turntable arranged above the cam, an inner ring steering track groove and an outer ring telescopic track groove are arranged on the cam, and a robot is arranged on the turntable, and the robot includes: a mounting part, the mounting part is hinged to the edge of the turntable through a vertical axis, one side of the mounting part extends outward to form a steering part, a steering roller rollingly embedded in the inner ring steering track groove is provided at the bottom of the steering part, a slide groove radially passing through the mounting part is provided on the mounting part, a telescopic part that can move freely along the slide groove is slidably connected in the slide groove, a telescopic roller rollingly embedded in the outer ring telescopic track groove is provided at the bottom of the telescopic part, a lifting cylinder is fixed to the outer end portion of the telescopic part, the piston rod of the lifting cylinder faces downward and is installed with a first parallel air claw, and a first plastic preform clamping part for clamping the plastic preform is respectively installed on the two clamping claw heads of the first parallel air claw.

4. The plastic parison conveying device capable of being matched with a heating furnace according to claim 1, 2 or 3, characterized in that: A blank discharging robot is provided at the blank discharging station of the heating furnace, and a flipping mechanism is provided on one side of the blank discharging robot. The blank discharging robot is used to take the plastic blank on the blank discharging station of the heating furnace out of the heating furnace and convey the plastic blank to the flipping mechanism; the flipping mechanism is used to receive the plastic blank conveyed by the blank discharging robot, flip the plastic blank into a correct position with the bottle mouth facing upward, and then convey it to the subsequent blow molding device.

5. The plastic parison conveying device that can be matched with a heating furnace according to claim 4, characterized in that: The structure of the blank discharging robot is the same as that of the blank feeding robot. The structure of the flipping mechanism includes: a rotating disk installed on the machine base and capable of rotating around its own axis, and a plurality of plastic blank clamping and flipping units are installed on the rotating disk at circumferential intervals. The structure of each plastic blank clamping and flipping unit includes: a swinging cylinder and a second parallel air claw. The cylinder body of the swinging cylinder is connected and fixed to the rotating disk, and the cylinder body of the second parallel air claw is installed on the rotating rod shaft of the swinging cylinder. The second plastic blank clamping part for clamping the plastic blank is respectively installed on the two claws of the second parallel air claw.

6. The plastic parison conveying device compatible with a heating furnace according to claim 1, characterized in that: One side of the flexible conveying unit is the blank feeding station, at which a blank feeding device is provided, and a plastic preform transfer robot is provided between the blank feeding device and the flexible conveying unit. The blank feeding device conveys the plastic preform to the blank feeding area on the blank feeding device, and the plastic preform transfer robot transfers the plastic preform from the blank feeding area on the blank feeding device to the flexible conveying unit.

7. The plastic parison conveying device compatible with a heating furnace according to claim 6, characterized in that: The structure of the blank feeding device includes: a plastic blank carrier, an upper conveyor belt and a lower conveyor belt; a plurality of placement parts for placing plastic blanks are evenly spaced on the plastic blank carrier; the lower conveyor belt is located below the upper conveyor belt, and a movable support plate located in the blank feeding area is provided on the output end side of the upper conveyor belt, and the movable support plate is provided on the bracket, and the end of the movable support plate close to the output end of the upper conveyor belt is defined as the front end, and the end of the movable support plate away from the output end of the upper conveyor belt is defined as the rear end, and the rear end of the movable support plate is hinged to the bracket through a rotating shaft, and a flip driving mechanism that can push the movable plate support to flip up and down around the rotating shaft is provided between the front end of the movable support plate and the bracket, and the movable support plate can be flipped upward to be connected with the output end of the upper conveyor belt, or can be flipped downward to be connected with the input end of the lower conveyor belt under the drive of the flip driving mechanism.

8. The plastic parison conveying device compatible with a heating furnace according to claim 7, characterized in that: The structure of the turning drive mechanism includes a turning cylinder, a cylinder body of the turning cylinder is hinged to the bracket, and a piston rod of the turning cylinder is hinged to the front bottom of the movable supporting plate.

9. The plastic parison conveying device capable of being matched with a heating furnace according to claim 6, 7 or 8, characterized in that: The structure of the plastic parison transfer robot includes: a mounting frame, a horizontal moving module is arranged in the mounting frame, a translation bracket is installed on the translation motion block of the horizontal moving module, a lifting bracket is arranged on the translation bracket, the lifting bracket is installed on the translation bracket through a lifting drive mechanism, the lifting drive mechanism can drive the lifting bracket to rise or fall, and a plurality of first clamps for clamping the plastic parison are installed on the lifting bracket.

10. The plastic parison conveying device capable of being matched with a heating furnace according to claim 9, characterized in that: The structure of the lifting drive mechanism includes: a lifting cylinder, a cylinder body of the lifting cylinder is connected to the translation bracket, and a piston rod of the lifting cylinder is connected to the lifting bracket downward.

11. A method for conveying plastic preforms in conjunction with a heating furnace, characterized in that: The following steps are involved: S1: The flexible conveying unit transports the plastic preform to the output area of ​​the flexible conveying unit. The preform feeding robot located at the preform feeding station of the heating furnace grabs and takes out the plastic preform in an inverted position with the bottle mouth facing downward located in the output area of ​​the flexible conveying unit. During this process, the running speed of the plastic preform in the output area is synchronized with the running speed of the gripper head of the preform feeding robot that grabs the plastic preform, that is, the plastic preform is conveyed in a follow-up manner between the flexible conveying unit and the preform feeding robot; S2: Then the blank feeding robot continues to transfer the plastic blank in an inverted posture and inserts it onto the blank insertion head of the blank feeding station of the heating furnace.

12. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, characterized in that: The flexible conveying unit can buffer a certain number of plastic preforms when working.

13. The method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, characterized in that: Also includes: S3: The discharging robot located at the discharging station of the heating furnace grabs and takes out the plastic preform that has been heated in the heating furnace and is sent to the discharging station of the heating furnace in an inverted posture; S4: The plastic preform taken out of the heating furnace in an inverted posture is then turned over so that the plastic preform is in an upright posture with the bottle mouth facing upward, and the plastic preform in the upright posture is then transferred to a subsequent blow molding device.

14. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, 12 or 13, characterized in that: The structure of the flexible conveying unit includes: an intelligent conveying track controlled by a control unit, on which are arranged several transfer trolleys that move along the intelligent conveying track, each transfer trolley is independently controlled by the control unit, and each transfer trolley is equipped with an insertion head for buckling plastic preforms in an inverted posture.

15. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, 12 or 13, characterized in that: The structure of the billet feeding robot includes: a cam fixedly mounted on a support, and a turntable arranged above the cam, an inner ring steering track groove and an outer ring telescopic track groove are arranged on the cam, and a robot is arranged on the turntable. The robot comprises: a mounting portion, the mounting portion is hinged to the edge of the turntable through a vertical axis, one side of the mounting portion extends outward to form a steering portion, a steering roller rollingly embedded in the inner ring steering track groove is provided at the bottom of the steering portion, a slide groove radially passing through the mounting portion is provided on the mounting portion, a telescopic portion that can move freely along the slide groove is slidably connected in the slide groove, a telescopic roller rollingly embedded in the outer ring telescopic track groove is provided at the bottom of the telescopic portion, a lifting cylinder is fixed at the outer end portion of the telescopic portion, the piston rod of the lifting cylinder faces downward and is installed with a first parallel air claw, and a first plastic preform clamping portion for clamping the plastic preform is respectively installed on the two claws of the first parallel air claw.

16. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, 12 or 13, characterized in that: In step S4, the plastic preform conveyed by the ejection robot is received by a turning mechanism, and the plastic preform is turned over into a right-side-up position with the bottle mouth facing upward, and then conveyed to a subsequent blow molding device.

17. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 16, characterized in that: The structure of the blank discharging robot is the same as that of the blank feeding robot; the structure of the flipping mechanism includes: a rotating disk installed on the frame and capable of rotating around its own axis, on which a plurality of plastic blank clamping and flipping units are installed at intervals along the circumferential direction, and the structure of each plastic blank clamping and flipping unit includes: a swinging cylinder and a second parallel air claw, the cylinder body of the swinging cylinder is connected and fixed to the rotating disk, the cylinder body of the second parallel air claw is installed on the rotating rod shaft of the swinging cylinder, and the two claws of the second parallel air claw are respectively installed with a second plastic blank clamping part for clamping the plastic blank.

18. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 11, 12 or 13, characterized in that: In step S1, the preform feeding device conveys the plastic preform in an inverted posture with the bottle mouth facing downward to the preform feeding area on the preform feeding device, and the plastic preform transfer robot transfers the plastic preform in the preform feeding area on the preform feeding device, still in an inverted posture with the bottle mouth facing downward, to the flexible conveying unit.

19. A method for conveying plastic preforms in conjunction with a heating furnace according to claim 18, characterized in that: The structure of the blank feeding device includes: a plastic blank carrier, an upper conveyor belt and a lower conveyor belt; a plurality of placement parts for placing plastic blanks are evenly spaced on the plastic blank carrier; the lower conveyor belt is located below the upper conveyor belt, and a movable support plate located in the blank feeding area is provided on the output end side of the upper conveyor belt, and the movable support plate is provided on the bracket, and the end of the movable support plate close to the output end of the upper conveyor belt is defined as the front end, and the end of the movable support plate away from the output end of the upper conveyor belt is defined as the rear end, and the rear end of the movable support plate is hinged to the bracket through a rotating shaft, and a flip driving mechanism that can push the movable plate support to flip up and down around the rotating shaft is provided between the front end of the movable support plate and the bracket, and the movable support plate can be flipped upward to be connected with the output end of the upper conveyor belt, or can be flipped downward to be connected with the input end of the lower conveyor belt under the drive of the flip driving mechanism.

20. The method for conveying plastic preforms in conjunction with a heating furnace according to claim 18, characterized in that: The structure of the plastic parison transfer robot includes: a mounting frame, a horizontal moving module is arranged in the mounting frame, a translation bracket is installed on the translation motion block of the horizontal moving module, a lifting bracket is arranged on the translation bracket, the lifting bracket is installed on the translation bracket through a lifting drive mechanism, the lifting drive mechanism can drive the lifting bracket to rise or fall, and a plurality of first clamps for clamping the plastic parison are installed on the lifting bracket.

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