A self-cleaning preform blowing system

Abstract

The present invention belongs to the technical field of bottle preform cleaning, and specifically relates to a self-cleaning bottle preform blowing system, which includes a bottle unscrambling assembly, a bottle loading assembly, a ring conveying assembly, a heating assembly, a molding assembly, and a bottle lowering assembly, which are sequentially distributed. The system also includes a cleaning assembly, which includes a bottle preform conveying guide rail connected between the bottle unscrambling assembly and the bottle loading assembly, and a cleaning box located on one side of the bottle preform conveying guide rail; a pneumatic clamping and transferring structure is provided on the side of the cleaning box, which sleeves the bottle preform on the outside of a cleaning needle tube; the rotation of the cleaning needle tube is used to complete the flushing, scraping, and drying operations, thereby ensuring the cleanliness of the interior of the bottle preform.

Description

Technical Field

[0001] The invention belongs to the technical field of bottle preform cleaning, in particular to a bottle blowing system for self-cleaning bottle preforms. Background Art

[0002] The existing PET packaging bottle production process follows the following sequence: raw material melting → hot melt → extrusion molding to obtain bottle blanks → transfer → bottle unscrambling → bottle loading (circular conveying) → heating → bottle blowing → bottle unloading. After obtaining the bottle blanks, dust and other impurities will be adsorbed inside the bottle blanks due to static electricity and during transportation. In addition, some mold release agents may also be present when obtaining the bottle blanks. If targeted cleaning is not performed, the subsequent bottle blowing operation will cause quality problems such as streaks and air holes in the bottle blanks. Existing cleaning operations mostly use direct rinsing and drying, which will cause streaks on the inner wall of the subsequent bottle blanks, thereby affecting the production of packaging bottles. Summary of the Invention

[0003] The technical problems to be solved by the present invention are:

[0004] How to solve the problem that the existing method of only using air blowing to clean the inside of the preform before bottle blowing cannot effectively clean it?

[0005] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0006] A self-cleaning preform blowing system comprises a bottle unscrambling assembly, a bottle loading assembly, a ring conveying assembly, a heating assembly, a forming assembly, and a bottle lowering assembly, which are sequentially arranged. The system also comprises a cleaning assembly, which comprises a preform conveying guide rail connected between the bottle unscrambling assembly and the bottle loading assembly, and a cleaning box located on one side of the preform conveying guide rail.

[0007] The side of the cleaning box is equipped with a pneumatic clamping and transferring structure to sheath the preform onto the outside of the cleaning needle tube;

[0008] A cleaning needle tube and a driving structure for driving the cleaning needle tube to rotate are installed in the cleaning box. The cleaning needle tube includes an inner tube and an outer tube. A hot air supply structure is installed at the bottom of the inner tube. A one-way diaphragm is provided on the top of the inner tube for opening and closing the air outlet end of the inner tube. The inner tube and the outer tube are arranged to form a flushing channel. A flushing pump is connected to the bottom of the flushing channel. Several flushing holes are distributed on the surface of the outer tube. A scraping structure is installed on the outside of the outer tube body. The scraping structure is used to clean the inner wall of the bottle preform.

[0009] In a more optimal solution, a fixing sleeve is installed on the outer side of the bottom of the outer tube, and an airbag ring is installed on the outer side of the fixing sleeve. The airbag ring is sealed at the bottle mouth position of the bottle blank. The center of the airbag ring and the center of the fixing sleeve are offset, and the offset direction is the side of the outer tube facing away from the scraping structure. A water receiving tray is installed on the outer side of the fixing sleeve, and the water receiving tray is located below the airbag ring and above the driving structure.

[0010] In one embodiment, the scraping structure may be a wiper strip;

[0011] Another embodiment is that in order to complete the strong cleaning operation and solve the problem that the vertical stripes are easily compressed and deformed after the airbag ring is expanded, resulting in an increase in internal air pressure and an inability to effectively discharge water stains, the inventors also proposed a negative pressure cleaning method, that is, the scraping structure includes a front water cleaning strip and a rear water cleaning strip, the two ends of the front water cleaning strip and the rear water cleaning strip are in contact with each other, the middle opposite ends of the front water cleaning strip and the rear water cleaning strip are offset to the rear side along the rotation direction, the front water cleaning strip and the rear water cleaning strip are arranged to form an inner wall cleaning area, and multiple groups of water inlets are evenly spaced on the side of the front water cleaning strip away from the outer tube;

[0012] An intermediate tube is sleeved on the outside of the inner tube, and an air pipe channel is arranged in the flushing channel. The air pipe channel is used to connect the inner wall cleaning area and the inner tube, and an external pumping structure is provided at the bottom of the intermediate tube.

[0013] In a more optimal solution, the pneumatic clamping and transferring structure includes a fixed frame installed on one side of the cleaning box, a lifting cylinder and a lifting frame installed on the end of the lifting cylinder piston rod and sliding relative to the cleaning box, a rotating cylinder is installed on the top of the lifting frame, a flip shaft is installed on the output end of the rotating cylinder, a fixed plate is installed on the flip shaft, a pneumatic clamp 1 is installed on the fixed plate, the airbag ring axis, the fixed sleeve axis and the clamping center of the pneumatic clamp 1 are coplanar, and sliding blocks are installed on the opposite sides of the pneumatic clamp 1 through springs.

[0014] In a more preferred solution, the bottle unscrambling assembly includes an upper bottle chain plate, a bottle unscrambling roller pair and a correction paddle. The upper bottle chain plate conveys the preforms to a material guide trough. The material guide trough is distributed above the bottle unscrambling roller pair and is located on the side away from the preform conveying guide rail. The bottle unscrambling roller pair includes two rollers rotating in opposite directions. The height of the two rollers close to the preform conveying guide rail is lower than the height of the side away from the preform conveying guide rail, and the height difference is 10-25mm. The two rollers convey the preforms to the preform conveying guide rail. The correction paddle is installed on the material guide trough above the bottle unscrambling roller pair, and a drive motor for driving the correction paddle is installed on the outside of the material guide trough.

[0015] In a more preferred solution, the annular conveying assembly includes an annular conveying chain, an intermittent pushing robot and an inner conveying chain. A plurality of preform seats are mounted on the annular conveying chain. The preform seats are hollow and rotate relative to the annular conveying chain. Gears are provided on the outer sides of the preform seats.

[0016] The intermittent pushing manipulator is independently distributed on one side of the circular conveyor chain;

[0017] The inner conveyor chain is arranged on the inner side of the ring conveyor chain and is used to drive the gear on the bottle preform seat;

[0018] The upper bottle assembly, the heating assembly, the forming assembly and the lower bottle assembly are arranged in sequence along the running direction of the ring conveyor chain.

[0019] In a more preferred solution, a conical guide head is provided on the top of the preform seat, and two groups of clamping ring bodies distributed up and down are installed on the outside of the conical guide head. The two groups of clamping ring bodies are used to press and fix the two ends of the sealing ring. The sealing ring is sleeved on the outside of the conical guide head, and an outer extrusion ring sleeved on the outside of the conical guide head is installed on the inside of the sealing ring. A radially sliding inner moving block is installed on the preform seat, and a vertically sliding lifting block is installed on the outside of the conical guide head. Both ends of the inner moving block are wedge-shaped structures. One end of the lifting block abuts against the inner moving block, and the other end is used to move the outer extrusion ring outward and press the sealing ring tightly into the bottle mouth of the preform.

[0020] The outer extrusion ring includes an outer extrusion block 1 radially fitted on the outer side of the conical guide head, the number of the outer extrusion blocks 1 is at least two, the outer extrusion blocks 1 are provided with two groups of symmetrically distributed arc guide grooves, the arc guide grooves are provided with connecting shafts, and the outer extrusion blocks 2 are connected between the adjacent two outer extrusion blocks 1, and the two ends of the outer extrusion blocks 2 are respectively connected to the connecting shafts;

[0021] The clamping ring body includes two symmetrically distributed semi-ring bodies and a hoop body for connecting the semi-ring bodies. The sides of the two semi-ring bodies are symmetrically distributed with arc grooves close to the ends of the semi-ring bodies. A constraint groove is provided on the side of the arc groove away from the semi-ring body. The two ends of the hoop body are respectively installed in the two adjacent arc grooves of the two semi-ring bodies. A constraint head is provided at the end of the hoop body, and the constraint head is clamped in the constraint groove.

[0022] In a more preferred solution, the upper bottle assembly and the lower bottle assembly both include a mounting frame and a horizontal plate, the horizontal plate is equipped with a rotating shaft and a servo drive component for driving the rotating shaft to rotate °, the rotating shaft is equipped with a pneumatic clamp 2, the pneumatic clamp 2 is used to clamp the bottle blank, the mounting frame is independently arranged below the horizontal plate, the mounting frame is equipped with a vertical cylinder, the piston rod of the vertical cylinder is connected and fixed to the horizontal plate, and is used to drive the horizontal plate to move up and down to put the bottle blank clamped by the pneumatic clamp 2 on the bottle blank seat or remove it from the bottle blank seat.

[0023] In a more preferred solution, the heating assembly includes a heating box distributed outside the circular conveyor chain, and infrared heating lamps are provided in the heating box, and the infrared heating lamps heat the rotating bottle blanks on the circular conveyor chain.

[0024] In a more preferred solution, the molding assembly includes:

[0025] A forming frame is provided with a forming side mold 1, a forming side mold 2, and a vertical guide groove. The forming side mold 1 and the forming side mold 2 are distributed on both sides of the preform seat. A forming drive member is provided on the top of the forming frame. The output end of the forming drive member is connected to the drive frame. The drive frame slides in the vertical guide groove. The drive frame is connected to the forming side mold 1 through the connecting frame 1 and is connected to the push-pull plate through the connecting frame 2. The forming side mold 1 and the forming side mold 2 move in opposite directions. The connecting frame 1 is hinged on the forming side mold 1, and the connecting frame 2 is hinged on the push-pull plate. The push-pull plate is connected to the forming side mold 1 after freely passing through the forming frame and the forming side mold 2 through the connecting rod.

[0026] The bottle blowing part is located below the circular conveyor chain and can freely pass through the preform seat from the bottom into the preform and stretch-blow the preform into shape.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adds a preform cleaning step to the bottle unscrambling and loading processes. In the preform cleaning step, the preform is inverted (with the bottle mouth facing downward) and subjected to rotary rinsing. After rinsing, it is rotated and scraped to dry simultaneously. During the scraping process, air is introduced into the airbag ring and expanded to contact the inner wall of the bottle mouth, thereby ensuring that the scraping structure can effectively contact the inner wall of the preform. After contact, the scraping structure rotates and scrapes the inner wall of the preform under the action of the driving structure. In conjunction with the hot air supply structure to deliver hot air into the inner tube and the one-way diaphragm on the top, the preform is dried and the inner wall is effectively cleaned. In the process of transferring the bottle blanks into the cleaning box, a pneumatic clamping and transferring structure is adopted. The lifting cylinder can drive the lifting frame downward, and the pneumatic clamp will clamp the outside of the bottle mouth. After clamping the bottle mouth, the lifting cylinder can drive the lifting frame upward until the bottle blank is completely out of the bottle blank conveying guide rail. Then the rotating cylinder drives the flip axis to rotate 180 degrees to turn the bottle mouth downward. The lifting cylinder can drive the lifting frame downward and insert the bottle mouth into the outside of the cleaning needle tube. Finally, the cleaning operation is carried out. After the cleaning is completed, the pneumatic clamping and transferring structure is used to return the bottle blank to the bottle blank conveying guide rail to complete the automated cleaning operation.

[0029] 2. In the bottle unscrambling process, the present invention uses the upper bottle chain to guide the bottle preform into the guide trough, and uses the bottom discharge port of the guide trough to drop the bottle preform between two rollers. The distance between the two rollers is slightly larger than the body of the bottle preform and smaller than the bottle mouth size (the outer diameter of the bottle mouth of the traditional bottle preform is larger than the outer diameter of the bottle body, such as Figure 26 As shown in the figure, the preforms can then pass under the correction paddle and enter the preform conveying guide rail. The correction paddle rotates in the guide trough to prevent the preforms from stacking up and entering the feed end of the preform conveying guide rail. At the same time, the feed end of the preform conveying guide rail adopts an arc structure for connection and material guidance, avoiding the risk of preforms getting stuck and falling.

[0030] 3. During the circular conveying of the preforms, the present invention employs an intermittent pusher to intermittently convey the circular conveyor chain a set distance, which is the distance required for each stretch-blow process. To ensure uniform heating of the preforms, gears on the inner conveyor chain and the preform holder are used to achieve self-rotation of the preforms. However, during conveying, the preforms can wobble, particularly during the initial and final stages of the intermittent push, and can also cause air leakage during subsequent stretch-blow molding. This can easily lead to quality issues in the finished bottles. To address this, the inventors optimized the structure of the preform holder and improved the conical guide head at the top of the preform holder. By adding an expansion-type sealing structure to the outer side of the conical guide head, the bottle mouth is secured and sealed, addressing the issues of preform sway and air leakage during stretch-blow molding. The inventors also employed a servo drive and system control system for the inner conveyor chain. While the intermittent pusher pushes the circular conveyor chain forward, the inner conveyor chain automatically adjusts its speed, ensuring a consistent and uniform rotation speed for the preforms.

[0031] 4. The present invention uses a connected structure to complete the bottle loading and unloading actions. During the bottle loading action, the vertical cylinder will drive the horizontal plate downward, and the pneumatic clamp 2 will complete the bottle loading by using the rotating shaft under the action of the servo drive component to insert the bottle preform with the bottle mouth facing downward onto the bottle preform seat to complete the bottle loading. The reverse action can realize the bottle unloading action. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a top view of the overall structure of the bottle blowing system of the present invention.

[0033] Figure 2 This is a top view of the positional relationship between the bottle unscrambling assembly and the cleaning assembly of the present invention.

[0034] Figure 3 This is the overall structural diagram of the bottle unscrambling assembly of the present invention.

[0035] Figure 4 It is a structural diagram of the bottle blank conveying guide rail of the present invention.

[0036] Figure 5 It is a top view of the cleaning component of the present invention.

[0037] Figure 6 This is the overall structural diagram of the pneumatic clamping and transferring structure of the present invention.

[0038] Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0039] Figure 8 This is a top view of the cleaning needle tube of the present invention (the cleaning structure is in the form of a wiper strip).

[0040] Figure 9This is a side view of the positional relationship between the cleaning needle tube and the water receiving tray of the present invention (the cleaning scraping structure is in the form of a scraping strip).

[0041] Figure 10 This is a diagram of the internal structure of the cleaning needle tube of the present invention (the cleaning structure is in the form of a wiper strip).

[0042] Figure 11 This is a top view of the cleaning needle tube of the present invention (the scraping structure adopts a negative pressure cleaning method).

[0043] Figure 12 This is a side view of the positional relationship between the cleaning needle tube and the water receiving tray of the present invention (the scraping structure adopts a negative pressure cleaning method).

[0044] Figure 13 This is a diagram of the internal structure of the cleaning needle tube of the present invention (the scraping structure adopts a negative pressure cleaning method).

[0045] Figure 14 for Figure 13 A partial enlarged view of point B in the middle.

[0046] Figure 15 It is a top view of the bottle blank seat of the present invention.

[0047] Figure 16 It is a cross-sectional view of the bottle blank seat of the present invention.

[0048] Figure 17 for Figure 16 A partial enlarged view of point C in the middle.

[0049] Figure 18 It is a bottom view of the outer extrusion ring of the present invention after external extrusion.

[0050] Figure 19 It is a bottom view of the outer extrusion ring of the present invention in its natural state.

[0051] Figure 20 It is the overall structural diagram of the clamping ring body of the present invention (when the hoop body is installed).

[0052] Figure 21 This is the overall structural diagram of the clamping ring body of the present invention (when the hoop body is not installed).

[0053] Figure 22 It is a horizontal cross-sectional view of the lifting block of the present invention.

[0054] Figure 23 This is an overall structural diagram of the upper bottle assembly or the lower bottle assembly of the present invention.

[0055] Figure 24 It is a top view of the molding component of the present invention.

[0056] Figure 25 It is a front view of the molding component of the present invention.

[0057] Figure 26 It is a schematic diagram of the bottle blank structure of the present invention.

[0058] In the figure: 10, bottle unscrambling assembly; 11, bottle loading chain plate; 12, bottle unscrambling roller; 13, correction paddle; 14, material guide chute; 15, drive motor.

[0059] 20. Bottle loading assembly; 21. Mounting frame; 22. Horizontal plate; 23. Rotating shaft; 24. Servo drive; 25. Vertical cylinder; 26. Pneumatic gripper 2.

[0060] 30. Annular conveying assembly; 31. Annular conveying chain; 32. Inner conveying chain; 33. Intermittent pushing robot; 34. Preform seat; 341. Conical guide head; 342. Sealing ring; 343. Clamp body; 3431. Semi-ring body; 3432. Arc groove; 3433. Constraint groove; 3434. Constraint head; 3435. Hoop body; 344. External extrusion ring; 3441. External extrusion block 1; 3442. Arc guide groove; 3443. Connecting shaft; 3444. External extrusion block 2; 345. Inner moving block; 346. Lifting block; 35. Gear.

[0061] 40. Heating assembly; 41. Heating box; 42. Infrared heating lamp.

[0062] 50. Molding assembly; 51. Molding frame; 511. Molding side mold 1; 512. Molding side mold 2; 513. Vertical guide groove; 514. Driving frame; 515. Push-pull plate; 516. Connecting frame 1; 517. Connecting frame 2; 518. Molding drive component; 519. Connecting rod; 52. Bottle blowing component.

[0063] 60. Bottle lowering assembly.

[0064] 70. Cleaning assembly; 71. Preform conveying guide rail; 72. Cleaning box; 721. Fixed frame; 722. Lifting cylinder; 723. Lifting frame; 724. Rotating cylinder; 725. Flipping axis; 726. Pneumatic gripper 1; 727. Sliding block; 73. Cleaning needle tube; 731. Inner tube; 732. Outer tube; 7321. Fixed sleeve; 733. Flushing hole; 734. External extraction structure; 735. Air pipe channel; 736. Hot air supply structure; 737. Air bag ring; 738. Front water strip; 739. Rear water strip; 7310. Flushing pump; 7311. Intermediate tube; 74. Water receiving tray; 75. Wiper strip. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0066] Example 1

[0067] like Figure 1 、 Figures 5 to 11 As shown, a self-cleaning preform blowing system includes a bottle unscrambling assembly 10, a bottle loading assembly 20, a ring conveying assembly 30, a heating assembly 40, a molding assembly 50, and a bottle lowering assembly 60, which are arranged in sequence. The system also includes a cleaning assembly 70. The cleaning assembly 70 includes a preform conveying guide rail 71 connected between the bottle unscrambling assembly 10 and the bottle loading assembly 20, and a cleaning box 72 located on one side of the preform conveying guide rail 71.

[0068] The side of the cleaning box 72 is provided with a pneumatic clamping and transporting structure, which sleeves the bottle blank onto the outside of the cleaning needle tube 73;

[0069] A cleaning needle tube 73 and a driving structure for driving the cleaning needle tube 73 to rotate are installed in the cleaning box 72. The cleaning needle tube 73 includes an inner tube 731 and an outer tube 732. A hot air supply structure 736 is installed at the bottom of the inner tube 731. A one-way diaphragm is provided on the top of the inner tube 731 for opening and closing the air outlet end of the inner tube 731. The inner tube 731 and the outer tube 732 are arranged to form a flushing channel. A flushing pump 7310 is connected to the bottom of the flushing channel. The flushing pump 7310 and the outer tube 732 are connected by a rotary joint. A number of flushing holes 733 are evenly distributed on the surface of the outer tube 732. A scraping structure is installed on the outside of the outer tube 732 for cleaning the inner wall of the bottle blank.

[0070] The scraping structure in this embodiment adopts a scraping strip 75, such as Figure 9 、 10 , as shown in 11.

[0071] During implementation, the bottle sorting assembly 10 arranges the preforms and conveys them to the preform conveying guide rail 71. After the pneumatic clamping and transfer structure removes the preforms, the preforms are placed on the cleaning needle tube 73 with the bottle mouth facing downward at a 180-degree angle. The flushing pump 7310 is turned on to pump cleaning liquid (which can be water or other liquids for cleaning the target object) into the flushing channel and sprayed on the inner wall of the preform through the flushing hole 733 for flushing. During the flushing, the driving structure drives the outer tube 732 to rotate for 2-5 seconds. After flushing, the flushing pump 7310 is turned off, and the scraping structure contacts the inner wall of the preform, cooperating with the action of the driving structure to achieve rotational scraping of the inner wall. Then the hot air supply structure 736 delivers hot air into the inner tube 731, and the one-way diaphragm opens to allow the hot air to enter the preform to dry the inner wall of the preform.

[0072] Example 2

[0073] In one embodiment of the bottle blowing system described above, Figure 10As shown, a fixing sleeve 7321 is installed on the outer side of the bottom of the outer tube 732, and an airbag ring 737 is installed on the outer side of the fixing sleeve 7321. The center of the airbag ring 737 and the center of the fixing sleeve 7321 are offset, and the offset direction is the side of the outer tube 732 facing away from the scraping structure. A water collecting tray 74 is installed on the outer side of the fixing sleeve 7321. The water collecting tray 74 is located below the airbag ring 737 and above the driving structure (electric drive gear transmission method).

[0074] After the rotation and flushing, the airbag ring 737 is inflated by air, forcing the scraping structure to fit on the inner wall of the bottle preform, which can ensure the scraping effect of the inner wall of the bottle preform and facilitate the bottle preform to be mounted on the outside of the cleaning needle tube 73 without obstruction.

[0075] It should be noted here that vertical drainage stripes need to be provided on the outer wall of the airbag ring 737. When it is expanded and fixed on the inner wall of the bottle mouth, the cleaning liquid and / or hot air can be discharged smoothly, and the rotary scraping action is at least two circles. The expansion, deflation and state switching of the airbag ring 737 here are all mature technologies today, so they will not be elaborated here.

[0076] Example 3

[0077] In one embodiment of the bottle blowing system described above, in order to achieve a strong cleaning operation and avoid the problem that only the wiper strip 75 is used, which may cause stains to remain on the front side, and the vertical stripes are easily compressed and deformed after the airbag ring 737 is expanded, resulting in increased internal air pressure and ineffective discharge of water stains, the inventors have proposed a negative pressure cleaning method, which is specifically as follows:

[0078] The scraping structure includes a front water strip 738 and a rear water strip 739. The two ends of the front water strip 738 and the rear water strip 739 are in contact with each other. The middle opposite ends of the front water strip 738 and the rear water strip 739 are offset to the rear side along the rotation direction. The front water strip 738 and the rear water strip 739 are arranged to form an inner wall cleaning area, and a plurality of water inlets are evenly spaced on the side of the front water strip 738 away from the outer tube 732.

[0079] An intermediate tube 7311 is sleeved on the outside of the inner tube 731 , and an air pipe channel 735 is arranged in the flushing channel. The air pipe channel 735 is used to connect the inner wall cleaning area and the inner tube 731 , and an external extraction structure 734 is provided at the bottom of the intermediate tube 7311 .

[0080] After rotating and flushing, the airbag ring 737 is inflated, forcing the front water strip 738 and the rear water strip 739 to fit on the inner wall of the bottle blank, so as to ensure the cleaning effect of the inner wall of the bottle blank and facilitate the smooth installation of the bottle blank on the outside of the cleaning needle tube 73 without obstruction.

[0081] After the front and rear water strips 738 and 739 contact the inner wall of the preform, they enclose a negative pressure suction space. This, combined with the negative pressure suction effect of the external suction structure 734, effectively and forcefully scrapes the inner wall surface. During scraping, the front water strip 738 also collects water stains on the inner wall of the preform toward the center, where they enter the negative pressure suction space through the water inlet. This water is then drawn outward by the external suction structure 734 to the outside of the preform, achieving a powerful cleaning effect. After scraping and drying, the airbag ring 737 deflates, opening the bottle mouth. During scraping, the hot air supply structure 736 delivers hot air into the interior of the preform, while the one-way diaphragm at the top opens, allowing hot air to enter the preform and dry the inner wall. During the hot air drying process, the negative pressure suction effect of the external suction structure 734 must be maintained to maintain pressure balance inside and outside the preform.

[0082] Example 4

[0083] In one embodiment of the bottle blowing system described above, Figure 6 and Figure 7 As shown, the pneumatic clamping and transferring structure includes a fixed frame 721 installed on one side of the cleaning box 72, a lifting cylinder 722 and a lifting frame 723 installed on the end of the piston rod of the lifting cylinder 722 and sliding relative to the cleaning box 72 are installed on the fixed frame 721, a rotating cylinder 724 (it can also be a stepping motor as a rotating drive component) is installed on the top of the lifting frame 723, a flip shaft 725 is installed at the output end of the rotating cylinder 724, a fixed plate is installed on the flip shaft 725, a pneumatic clamp 726 is installed on the fixed plate, the axis of the airbag ring 737, the axis of the fixed sleeve 7321 and the clamping center of the pneumatic clamp 726 are coplanar, and sliding blocks 727 are installed on the opposite sides of the pneumatic clamp 726 through springs.

[0084] In order to realize the transfer and pick-up and place actions between the bottle blank conveying guide rail 71 and the cleaning needle tube 73, the lifting cylinder 722 is used to lower the pneumatic clamping claw 726 to the bottle mouth position, and the pneumatic clamping claw 726 is clamped and fixed. Then, the lifting cylinder 722 moves the pneumatic clamping claw 726 upward until the bottle blank leaves the bottle blank conveying guide rail 71, and the rotating cylinder 724 drives the turning shaft 725 to turn the pneumatic clamping claw 726 180 degrees, so that the bottle mouth is facing downward and is above the cleaning needle tube 73. Then, the lifting cylinder 722 lowers the pneumatic clamping claw 726 again to clean the bottle. After the cleaning needle tube 73 enters the interior of the bottle blank and performs a cleaning operation, the lifting cylinder 722 moves the pneumatic clamp 726 upward to the height before the bottle blank is sleeved on the outside of the cleaning needle tube 73. The rotating cylinder 724 drives the turning shaft 725 to turn the pneumatic clamp 726 180 degrees in the opposite direction so that the bottle mouth faces upward again. The lifting cylinder 722 lowers the pneumatic clamp 726. After the bottle blank re-enters the bottle blank conveying guide rail 71, the bottle blank is released and the lifting cylinder 722 moves the pneumatic clamp 726 upward to return to the initial position height.

[0085] In order to cooperate with the airbag ring 737 to move the bottle blank a certain distance, so that the front water strip 738 and the rear water strip 739 fit on the inner wall of the bottle blank to form a negative pressure suction area, sliding blocks 727 are installed on the opposite sides of the pneumatic clamp 726 through springs to achieve compensation for the displacement of the bottle blank and automatic reset.

[0086] It should be noted here that the cleaning time of a single bottle blank is about 10-20 seconds. In order to cope with the high-efficiency production of packaging bottles, 8-20 cleaning needles 73 can be arranged in the cleaning box 72. The selection can be made according to the specific situation of the workshop site. By increasing the number of cleaning needles 73, the high-speed bottle loading production requirements of the bottle loading assembly 20 can be met, so that after each bottle loading, there will always be bottle blanks waiting for loading on the bottle blank conveying guide rail 71.

[0087] Example 5

[0088] In one embodiment of the bottle blowing system described above, Figure 2 and Figure 3 As shown, the bottle unscrambling assembly 10 includes an upper bottle chain plate 11, a bottle unscrambling roller pair 12 and a correction paddle 13. The upper bottle chain plate 11 conveys the preforms to a guide trough 14. The guide trough 14 is distributed above the bottle unscrambling roller pair 12 and is located on the side away from the preform conveying guide rail 71. The bottle unscrambling roller pair 12 includes two roller shafts rotating in opposite directions. The height of the two roller shafts close to the preform conveying guide rail 71 is lower than the height of the side away from the preform conveying guide rail 71, and the height difference is 10-25mm. The two roller shafts convey the preforms to the preform conveying guide rail 71. The correction paddle 13 is installed on the guide trough 14 above the bottle unscrambling roller pair 12, and a drive motor 15 for driving the correction paddle 13 is installed on the outside of the guide trough 14.

[0089] The upper bottle chain plate 11 conveys the bottle blanks into the guide trough 14, and the bottom drop port of the guide trough 14 drops the bottle blanks into the gap between the rollers. Since the outer diameter of the bottle mouth is larger than the roller gap and the outer diameter of the bottle body is smaller than the roller gap, the bottom of the bottle blank will pass through the roller gap and deflect downward, and then the bottle blank will automatically adjust its angle so that the bottle mouth faces upward. At this time, the bottle blank will pass under the correction paddle 13 under the conveyance of the bottle unscrambling roller 12, and finally enter the feed end of the bottle blank conveying guide rail 71. The correction paddle 13 rotates in the guide trough 14, and the accumulated bottle blanks can be dispersed after rotation.

[0090] Example 6

[0091] In one embodiment of the bottle blowing system described above, Figure 1As shown, the annular conveyor assembly 30 includes an annular conveyor chain 31, an intermittent pushing robot 33 and an inner conveyor chain 32. A plurality of preform seats 34 are mounted on the annular conveyor chain 31. The preform seats 34 are hollow and rotate relative to the annular conveyor chain 31. Gears 35 are provided on the outer sides of the preform seats 34.

[0092] The intermittent pushing robot 33 is independently distributed on one side of the ring conveyor chain 31;

[0093] The inner conveyor chain 32 is arranged on the inner side of the endless conveyor chain 31 and is used to drive the gear 35 on the preform seat 34;

[0094] The upper bottle assembly 20 , the heating assembly 40 , the forming assembly 50 , and the lower bottle assembly 60 are sequentially arranged along the running direction of the endless conveying chain 31 .

[0095] The upper bottle assembly 20 removes the preform from the discharge end of the preform conveying guide rail 71 and mounts it on the preform holder 34. The ring conveyor chain 31 conveys the preform to the heating assembly 40. Before entering the heating assembly 40, the inner conveyor chain 32 drives the gear 35 to rotate, thereby rotating the preform holder 34 and the preform at a uniform speed, so that the preform is heated evenly. The intermittent pushing robot 33 intermittently pushes the ring conveyor chain 31 a set distance, which is the distance required for each molding operation.

[0096] Example 7

[0097] In one embodiment of the bottle blowing system described above, Figures 15 to 22 As shown, the top of the bottle base 34 is provided with a conical guide head 341, and two sets of clamping ring bodies 343 distributed up and down are installed on the outside of the conical guide head 341. The two sets of clamping ring bodies 343 are used to press and fix the two ends of the sealing ring 342. The sealing ring 342 is sleeved on the outside of the conical guide head 341. The inner side of the sealing ring 342 is installed with an outer extrusion ring 344 sleeved on the outside of the conical guide head 341. The bottle base 34 is installed with a radial sliding fit with an inward moving block 345. The conical guide head 341 A lifting block 346 for vertical sliding cooperation is installed on the outer side of 41, and vertical sliding grooves are evenly distributed on the side of the conical guide head 341 for the vertical sliding of the lifting block 346. The side of the lifting block 346 is provided with a vertical groove for installing a sliding piece fixed on the inner wall of the sealing ring 342. Both ends of the inner moving block 345 are wedge-shaped structures. One end of the lifting block 346 abuts against the inner moving block 345, and the other end is used to move the outer extrusion ring 344 outward to press the sealing ring 342 into the bottle mouth of the bottle preform.

[0098] The outer extrusion ring 344 includes an outer extrusion block 3441 radially fitted on the outside of the conical guide head 341. There are at least two groups of outer extrusion blocks 3441. Two groups of symmetrically distributed arc guide grooves 3442 are provided on the outer extrusion block 3441. A connecting shaft 3443 is installed in the arc guide groove 3442. An outer extrusion block 3444 is connected between two adjacent outer extrusion blocks 3441. The two ends of the outer extrusion block 3444 are respectively connected to the connecting shaft 3443.

[0099] The retaining ring body 343 includes two symmetrically distributed semi-ring bodies 3431 and a hoop body 3435 for connecting the semi-ring bodies 3431. The sides of the two semi-ring bodies 3431 are symmetrically distributed with arc grooves 3432 close to the ends of the semi-ring bodies 3431. A constraint groove 3433 is provided on the side of the arc groove 3432 away from the semi-ring body 3431. The two ends of the hoop body 3435 are respectively installed in the two adjacent arc grooves 3432 of the two semi-ring bodies 3431. A constraint head 3434 is provided at the end of the hoop body 3435. The constraint head 3434 is clamped in the constraint groove 3433. A magnetic structure can be installed in the constraint groove 3433 to fix the constraint head 3434. A magnetic structure can be added between the constraint head 3434 and the constraint groove 3433 to ensure the long-term stability of the structure.

[0100] During implementation, the lifting block 346, the inner displacement block 345, and the outer extrusion ring 344 are first installed on the outside of the conical guide head 341. Then, the semi-ring body 3431 is used to dock the outer side of the end of the sealing ring 342. The hoop body 3435 and the restraining head 3434 are respectively inserted and adapted to the arc groove 3432 and the restraining groove 3433 to complete the assembly. When the bottle mouth acts on the end of the inner displacement block 345 from top to bottom, the inner displacement block 345 moves inward, forcing the lifting block 346 upward, thereby radially moving the outer extrusion block 1 3441 outward, and cooperating with the outer extrusion block 2 3444 to complete the outer expansion of the sealing ring 342 to seal the bottle mouth. After the sealing is completed, the end face of the inner displacement block 345 abuts against the inner wall of the bottle mouth, forming a stable abutment structure. When it is necessary to remove a bottle, the bottle mouth and the inner displacement block 345 are actively separated by the bottle removal assembly 60.

[0101] Example 8

[0102] In one embodiment of the bottle blowing system described above, Figure 23As shown, the upper bottle assembly 20 and the lower bottle assembly 60 both include a mounting frame 21 and a horizontal plate 22. A rotating shaft 23 and a servo drive 24 for driving the rotating shaft 23 to rotate 180° are mounted on the horizontal plate 22. A pneumatic clamp 26 is mounted on the rotating shaft 23. The pneumatic clamp 26 is used to clamp the bottle blank. The mounting frame 21 is independently arranged below the horizontal plate 22. A vertical cylinder 25 is mounted on the mounting frame 21. The piston rod of the vertical cylinder 25 is fixedly connected to the horizontal plate 22 to drive the horizontal plate 22 to move up and down to fit the bottle blank clamped by the pneumatic clamp 26 onto the bottle blank seat 34 or remove it from the bottle blank seat 34.

[0103] When it is necessary to load a bottle, the vertical cylinder 25 drives the horizontal plate 22 downward, and the pneumatic clamp 26 clamps the bottle mouth of the preform at the discharge end of the preform conveying guide rail 71. Then the vertical cylinder 25 drives the horizontal plate 22 upward. After it is completely separated from the preform conveying guide rail 71, the servo drive 24 drives the rotating shaft 23 to rotate 180°, and then rotates the preform to just above the preform seat 34. Then the vertical cylinder 25 drives the horizontal plate 22 downward, and the preform is inserted into the outer side of the conical guide head 341. The pneumatic clamp 26 releases the preform. The vertical cylinder 25 drives the horizontal plate 22 upward to a height just above the preform seat 34 before the preform is inserted. Then the servo drive 24 drives the rotating shaft 23 to rotate 180° in the opposite direction to re-perform the clamping operation.

[0104] When it is necessary to unload the bottle, the vertical cylinder 25 drives the horizontal plate 22 downward, and the pneumatic clamp 26 clamps the outer side of the bottle mouth on the bottle preform seat 34. Then the vertical cylinder 25 drives the horizontal plate 22 upward. After it is completely separated from the bottle preform seat 34, the servo drive 24 drives the rotating shaft 23 to rotate 180°, thereby placing the bottle above the bottle conveyor chain. The vertical cylinder 25 drives the horizontal plate 22 downward, and the bottle falls on the bottle conveyor chain. The pneumatic clamp 26 releases the bottle on the bottle preform seat 34, and the vertical cylinder 25 drives the horizontal plate 22 upward to reset.

[0105] Example 9

[0106] In one embodiment of the bottle blowing system described above, Figure 1 As shown, the heating assembly 40 includes a heating box 41 distributed outside the circular conveyor chain 31 , and an infrared heating lamp 42 is provided in the heating box 41 . The infrared heating lamp 42 heats the bottle blanks rotating on the circular conveyor chain 31 .

[0107] During the conveying process of the circular conveyor chain 31, the preform enters the heating box 41 after starting to rotate and can continue to rotate after coming out of the heating box 41. When the preform passes through the heating box 41, it is heated by the infrared heating lamp 42 to ensure stretch blow molding.

[0108] Example 10

[0109] In one embodiment of the bottle blowing system described above, Figure 1 and Figure 24 、 Figure 25 As shown, the molding assembly 50 includes:

[0110] The forming frame 51 is provided with a forming side mold 1 511, a forming side mold 2 512, and a vertical guide groove 513. The forming side mold 1 511 and the forming side mold 2 512 are distributed on both sides of the preform seat 34. A forming driving member 518 is installed on the top of the forming frame 51. The output end of the forming driving member 518 is connected to the driving frame 514. The driving frame 514 slides in the vertical guide groove 513. The driving frame 514 is connected to the forming side mold 1 511 through the connecting frame 1 516 and is connected to the push-pull plate 515 through the connecting frame 2 517. The forming side mold 1 511 and the forming side mold 2 512 move horizontally relative to the forming frame 51 and in opposite directions. The connecting frame 1 516 is hinged on the forming side mold 1 511, and the connecting frame 2 517 is hinged on the push-pull plate 515. The push-pull plate 515 freely passes through the forming frame 51 and the forming side mold 2 512 through the connecting rod 519 and is connected to the forming side mold 1 511.

[0111] The bottle blowing member 52 is a traditional bottle blowing structure. The bottle blowing member 52 is located below the endless conveyor chain 31 and can freely pass through the preform seat 34 from the bottom to enter the preform and stretch-blow the preform into shape.

[0112] During implementation, the molding drive member 518 on the molding frame 51 drives the drive frame 514 to move up and down along the vertical guide groove 513. When moving down, the molding side mold 1 511 and the molding side mold 2 512 are clamped to the left and right (the bottle blank is wrapped in the molding mold cavity). When moving up, the molding side mold 1 511 and the molding side mold 2 512 are opened. After clamping, the bottle blowing member 52 will penetrate into the bottle blank from the bottom of the bottle blank seat 34 to pull and blow the bottle blank to obtain a packaging bottle.

Claims

1. A self-cleaning preform blowing system, comprising a bottle unscrambling assembly (10), a bottle loading assembly (20), a ring conveying assembly (30), a heating assembly (40), a molding assembly (50) and a bottle lowering assembly (60) which are sequentially arranged, characterized in that: The cleaning assembly (70) further includes a preform conveying guide rail (71) connected between the bottle unscrambling assembly (10) and the bottle loading assembly (20) and a cleaning box (72) located on one side of the preform conveying guide rail (71); A pneumatic clamping and transporting structure is provided on the side of the cleaning box (72) to sheath the bottle blank onto the outside of the cleaning needle tube (73); A cleaning needle tube (73) and a driving structure for driving the cleaning needle tube (73) to rotate are installed in the cleaning box (72). The cleaning needle tube (73) includes an inner tube (731) and an outer tube (732). A hot air supply structure (736) is installed at the bottom of the inner tube (731). A one-way diaphragm is provided at the top of the inner tube (731) for opening and closing the air outlet end of the inner tube (731). The inner tube (731) and the outer tube (732) are surrounded by a flushing channel. A flushing pump (7310) is externally connected to the bottom of the flushing channel. A plurality of flushing holes (733) are evenly distributed on the surface of the outer tube (732). A scraping structure is installed on the outside of the outer tube (732). The scraping structure is used to clean the inner wall of the bottle blank. The cleaning structure includes a front water strip (738) and a rear water strip (739), the two ends of the front water strip (738) and the rear water strip (739) are in abutment with each other, the middle opposite ends of the front water strip (738) and the rear water strip (739) are offset toward the rear side along the rotation direction, the front water strip (738) and the rear water strip (739) are arranged to form an inner wall cleaning area, and a plurality of water inlets are evenly spaced on a side of the front water strip (738) away from the outer tube (732); An intermediate tube (7311) is sleeved on the outside of the inner tube (731), and an airway channel (735) is arranged in the flushing channel. The airway channel (735) is used to connect the inner wall cleaning area and the inner tube (731). An external extraction structure (734) is provided at the bottom of the intermediate tube (7311).

2. A self-cleaning preform blowing system according to claim 1, characterized in that: A fixing sleeve (7321) is mounted on the outer side of the bottom of the outer tube (732), and an airbag ring (737) is mounted on the outer side of the fixing sleeve (7321). The airbag ring (737) seals the bottle mouth of the preform. The center of the airbag ring (737) and the center of the fixing sleeve (7321) are offset, and the offset direction is the side of the outer tube (732) facing away from the scraping structure. A water receiving tray (74) is mounted on the outer side of the fixing sleeve (7321), and the water receiving tray (74) is located below the airbag ring (737) and above the driving structure.

3. The self-cleaning preform blowing system according to claim 1, characterized in that: The pneumatic clamping and transporting structure includes a fixed frame (721) installed on one side of the cleaning box (72), a lifting cylinder (722) and a lifting frame (723) installed on the end of the piston rod of the lifting cylinder (722) and sliding relative to the cleaning box (72), a rotating cylinder (724) is installed on the top of the lifting frame (723), a turning shaft (725) is installed on the output end of the rotating cylinder (724), a fixed plate is installed on the turning shaft (725), and a pneumatic clamping jaw (726) is installed on the fixed plate. The axis of the airbag ring (737), the axis of the fixed sleeve (7321) and the clamping center of the pneumatic clamping jaw (726) are coplanar, and sliding blocks (727) are installed on the opposite sides of the pneumatic clamping jaw (726) through springs.

4. The self-cleaning preform blowing system according to claim 1, characterized in that: The bottle unscrambling assembly (10) comprises an upper bottle chain plate (11), a bottle unscrambling roller pair (12) and a correction paddle (13). The upper bottle chain plate (11) conveys the preforms to a guide trough (14). The guide trough (14) is distributed above the bottle unscrambling roller pair (12) and is located on a side away from the preform conveying guide rail (71). The bottle unscrambling roller pair (12) comprises two roller shafts rotating in opposite directions. The height of the sides of the two roller shafts close to the preform conveying guide rail (71) is lower than the height of the sides away from the preform conveying guide rail (71), and the height difference is 10-25 mm. The two roller shafts convey the preforms to the preform conveying guide rail (71). The correction paddle (13) is installed on the guide trough (14) above the bottle unscrambling roller pair (12), and a driving motor (15) for driving the correction paddle (13) is installed on the outside of the guide trough (14) to drive the correction paddle (13).

5. The self-cleaning preform blowing system according to claim 1, characterized in that: The annular conveying assembly (30) includes an annular conveying chain (31), an intermittent pushing robot (33) and an inner conveying chain (32). A plurality of groups of bottle preform seats (34) are installed on the annular conveying chain (31). The bottle preform seats (34) are hollow structures and rotate relative to the annular conveying chain (31). Gears (35) are provided on the outer sides of the bottle preform seats (34). The intermittent pushing manipulator (33) is independently distributed on one side of the ring conveyor chain (31); The inner conveyor chain (32) is arranged on the inner side of the ring-shaped conveyor chain (31) and is used to drive the gear (35) on the preform seat (34); The upper bottle assembly (20), the heating assembly (40), the molding assembly (50), and the lower bottle assembly (60) are arranged in sequence along the running direction of the annular conveyor chain (31).

6. The self-cleaning preform blowing system according to claim 5, characterized in that: The top of the bottle preform seat (34) is provided with a conical guide head (341), and two groups of clamping ring bodies (343) are installed on the outer side of the conical guide head (341) and are distributed up and down. The two groups of clamping ring bodies (343) are used to press and fix the two ends of the sealing ring (342). The sealing ring (342) is sleeved on the outer side of the conical guide head (341), and an outer extrusion ring (344) sleeved on the outer side of the conical guide head (341) is installed on the inner side of the sealing ring (342). A radially sliding inner moving block (345) is installed on the bottle preform seat (34), and a vertically sliding lifting block (346) is installed on the outer side of the conical guide head (341). Both ends of the inner moving block (345) are wedge-shaped structures. One end of the lifting block (346) abuts against the inner moving block (345), and the other end is used to move the outer extrusion ring (344) outward to press the sealing ring (342) into the bottle preform bottle mouth. The outer extrusion ring (344) includes an outer extrusion block (3441) radially fitted on the outside of the conical guide head (341), the number of the outer extrusion blocks (3441) being at least two groups, two groups of symmetrically distributed arc guide grooves (3442) being provided on the outer extrusion block (3441), a connecting shaft (3443) being installed in the arc guide groove (3442), an outer extrusion block (3444) being connected between two adjacent outer extrusion blocks (3441), and both ends of the outer extrusion block (3444) being connected to the connecting shaft (3443) respectively; The clamping ring body (343) comprises two symmetrically distributed semi-ring bodies (3431) and a hoop body (3435) for connecting the semi-ring bodies (3431). The sides of the two semi-ring bodies (3431) are symmetrically distributed with arcuate grooves (3432) close to the ends of the semi-ring bodies (3431). A restraining groove (3433) is provided on the side of the arcuate groove (3432) away from the semi-ring bodies (3431). The two ends of the hoop body (3435) are respectively installed in two adjacent arcuate grooves (3432) of the two semi-ring bodies (3431). The end of the hoop body (3435) is provided with a restraining head (3434), which is clamped in the restraining groove (3433).

7. The self-cleaning preform blowing system according to claim 5, characterized in that: The upper bottle assembly (20) and the lower bottle assembly (60) both include a mounting frame (21) and a horizontal plate (22). The horizontal plate (22) is provided with a rotating shaft (23) and a servo drive member (24) for driving the rotating shaft (23) to rotate 180 degrees. The rotating shaft (23) is provided with a second pneumatic clamp (26). The second pneumatic clamp (26) is used to clamp the bottle blank. The mounting frame (21) is independently arranged below the horizontal plate (22). The mounting frame (21) is provided with a vertical cylinder (25). The piston rod of the vertical cylinder (25) is connected and fixed to the horizontal plate (22) and is used to drive the horizontal plate (22) to move up and down to fit the bottle blank clamped by the second pneumatic clamp (26) onto the bottle blank seat (34) or remove it from the bottle blank seat (34).

8. The self-cleaning preform blowing system according to claim 5, characterized in that: The heating assembly (40) includes a heating box (41) distributed outside the circular conveyor chain (31), and an infrared heating lamp (42) is arranged in the heating box (41). The infrared heating lamp (42) heats the bottle blanks rotating on the circular conveyor chain (31).

9. The self-cleaning preform blowing system according to claim 5, characterized in that: The molding assembly (50) comprises: A forming frame (51) is provided with a forming side mold 1 (511), a forming side mold 2 (512), and a vertical guide groove (513). The forming side mold 1 (511) and the forming side mold 2 (512) are distributed on both sides of the preform seat (34). A forming drive member (518) is provided on the top of the forming frame (51). The output end of the forming drive member (518) is connected to a driving frame (514). The driving frame (514) is slidably fitted in the vertical guide groove (513). The driving frame (514) is connected to the forming drive member (518). The first frame (516) is connected to the first forming side mold (511), and is connected to the push-pull plate (515) through the second connecting frame (517). The first forming side mold (511) and the second forming side mold (512) move in opposite directions. The first connecting frame (516) is hinged to the first forming side mold (511), and the second connecting frame (517) is hinged to the push-pull plate (515). The push-pull plate (515) freely passes through the forming frame (51) and the second forming side mold (512) through the connecting rod (519) and is connected to the first forming side mold (511). The bottle blowing part (52) is located below the annular conveyor chain (31) and can freely pass through the bottle preform seat (34) from the bottom to enter the bottle preform and stretch-blow the bottle preform into shape.

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