Plastic bottle blow molding production equipment and molding method thereof

Abstract

The invention relates to the field of plastic recycling, and discloses plastic bottle blow molding production equipment which comprises a rack, a bearing assembly, a heating assembly, a blow molding assembly and a discharging assembly are arranged on the rack, and the bearing assembly comprises a rotating ring and a first motor driving the rotating ring to rotate; four bearing units are arranged on the end face of the rotating ring in an array mode in the circumferential direction, the heating assembly comprises an inner heating component and a heating chamber, the inner heating component comprises a first connecting shaft, the first connecting shaft is provided with an inner heating unit, the inner heating unit comprises an inner heating piece, and the inner heating piece comprises a first fixing guide pipe parallel to the moving direction of the heating chamber; and an inner heating pipe is sleeved with the first fixed guide pipe, the tail end of the inner heating pipe is arranged to be conical, and when the tail end of the inner heating pipe extends into the bottle blank and then continues to move, the outer circle face of the tail end of the inner heating pipe can be attached to the inner wall of the tail end of the bottle blank, and the effects that the inner wall is attached in a profiling mode, and key parts of the bottom of the bottle blank are heated in a fixed-point mode are achieved.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling and reuse, specifically to the field of plastic bottle production, and particularly to a plastic bottle blow molding production equipment and molding method. Background Technology

[0002] Plastic products are very common in daily life, such as plastic bottles. Based on the current development concept of maximizing resource utilization, recycling and reusing waste plastics is both necessary and common. Using waste plastics as raw materials to produce plastic bottles is one way to recycle and reuse waste plastics.

[0003] Plastic bottle production mostly uses a two-step process. The first step is injection molding of the preform, and the second step is to reheat the preform and blow mold it into a bottle. The second step is generally achieved using blow molding equipment, namely a blow molding machine.

[0004] During the blow molding process from preform to finished product, the heating uniformity of the preform is one of the factors affecting the quality of the final product. Specifically, when heating the preform, it is necessary to ensure radial and axial uniformity. The former refers to controlling the temperature difference at various points along the circumference of the preform to within 2 degrees Celsius. If the radial temperature difference is too large, it will lead to uneven stretching of the preform during blow molding, resulting in defects such as elliptical bottle body, thinner wall thickness, or local bulging. The latter refers to the need for precise temperature control at different parts of the preform (bottle neck, body, and bottom), with the axial temperature difference not exceeding 3 degrees Celsius. In addition, during continuous production, it is also necessary to ensure that the heating temperature fluctuation of different preforms is controlled within 1.5 degrees Celsius to ensure the consistency of the quality of the finished bottles.

[0005] In existing technologies, bottle preforms are typically placed in a heating chamber for heating. Since the preform is hollow, the outer wall of the preform is heated more than the inner wall, resulting in uneven heating. Furthermore, during the placement of the preform, there may be a coaxiality error between the preform and the preform holder, causing the preform to tilt slightly, which also affects the uniformity of heating.

[0006] Based on the above, the present invention proposes a plastic bottle blow molding production equipment and molding method. Summary of the Invention

[0007] To address the problems mentioned in the background above, the present invention provides a plastic bottle blow molding production equipment and molding method thereof.

[0008] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0009] A plastic bottle blow molding production equipment includes a frame, on which a load-bearing component, a heating component, a blow molding component and a discharge component are arranged. The load-bearing component includes two rotating rings with horizontal axis and coaxial arrangement and a motor for driving the rotating rings to rotate. A load-bearing unit is arranged between the two rotating rings, and four load-bearing units are arranged in an array along the circumference of the rotating rings. The location of the bearing unit at the lowest point of the outer circle of the rotating ring is named the feeding position, the location of the bearing unit at the highest point of the outer circle of the rotating ring is named the blow molding position, and the locations of the remaining two bearing units are named the heating position and the discharge position, respectively, and are named feeding position, heating position, blow molding position and discharge position in sequence along the rotation direction of the rotating ring. The heating assembly includes an inner heating component, a heating chamber, and a linear module 1 that drives the heating chamber to move. The heating chamber moves in a horizontal direction and is perpendicular to the axis of the rotating ring. A heating cavity is provided on the side of the heating chamber facing the axis of the rotating ring. The inner heating component is used to heat the preform from the inside.

[0010] Furthermore, the bearing unit includes a bearing rod disposed between two rotating rings, and a plurality of bearing members are arranged in an array on the bearing rod along the axis of the rotating rings; The bearing component includes a mounting hole arranged radially along the end face of the bearing rod. A fixing sleeve is coaxially arranged in the mounting hole. A bearing shaft in the shape of a hollow shaft is fitted inside the fixing sleeve, and a spring is arranged between the two. The elastic force of the spring drives the bearing shaft away from the axis of the rotating ring.

[0011] Furthermore, the internal heating element and the heating chamber are located on opposite sides of the heating position; The internal heating component includes a connecting shaft 1 parallel to the center line of the rotating ring. The input end of the connecting shaft 1 is equipped with a motor 2. An internal heating unit is provided on the connecting shaft 1. Multiple internal heating units are provided corresponding to the bottle preform on the bearing unit. The internal heating unit includes an internal heating element and a traction element 1. The internal heating element includes a fixed guide tube that is fixedly mounted on the frame and parallel to the direction of movement of the heating chamber, and an internal heating tube is sleeved inside the fixed guide tube.

[0012] Furthermore, the traction component includes a gear seat with two sleeve holes, which are respectively fitted onto the connecting shaft and the fixed guide tube. A helical gear set is installed inside the gear seat. The driving helical gear of the helical gear set is installed on the connecting shaft, and the driven helical gear of the helical gear set is movably fitted onto the fixed guide tube. Several external magnets are arrayed and embedded in the inner wall of the driven helical gear along the circumferential direction. Several internal magnets are arrayed and embedded in the outer wall of the inner heating tube along the circumferential direction. The magnetic poles of the external magnets and the internal magnets are opposite.

[0013] Furthermore, the end of the inner heating tube is set in a conical shape, and when the end of the inner heating tube extends into the preform and continues to move, the outer circular surface of the end of the inner heating tube can fit against the inner wall of the end of the preform.

[0014] Furthermore, the blow molding assembly includes a mold and a blow molding component, with the mold located above the heating position and the blow molding component located below the heating position; The mold includes a slide and a linear module 2 that drives the slide to move. The sliding moves in a direction parallel to the axis of the rotating ring. Two mold bases and a linear module 3 that drives the two mold bases to move closer or further apart are mounted on the slide. The mold bases move in a horizontal direction and are perpendicular to the axis of the rotating ring. The two mold bases are distributed along the direction of their movement. Mold grooves and clearance openings are provided on the opposite side of the two mold bases, and multiple of both are arranged in an array along the axis of the rotating ring, and they are arranged in an alternating manner.

[0015] Furthermore, the blow molding component includes a connecting shaft two parallel to the center line of the rotating ring and a blow molding unit located below the mold cavity; The input end of the connecting shaft two is equipped with motor three; The blow molding unit includes a fixed guide tube II that is fixedly mounted on the frame and arranged vertically. A blow molding tube is sleeved inside the fixed guide tube II. The blow molding tube is divided into a sliding section that forms a sliding guide engagement with the fixed guide tube II along the axis and a stretching section that is set at the upper end of the sliding section. The outer circular surface of the stretching section is provided with a blow molding hole. The bearing axis of the bearing unit located at the blow molding position is coaxial with the blow molding tube of the corresponding blow molding unit; All the fixed conduits of the blow molding units are connected to each other via the main pipe at their lower openings.

[0016] Furthermore, a traction component 2 is provided between the connecting shaft 2 and the fixed conduit 2. The structure of the traction component 2 is the same as that of the traction component 1, and the connection relationship between the connecting shaft 2, the fixed conduit 2, the blow molding tube and the traction component 2 is the same as that between the connecting shaft 1, the fixed conduit 1, the internal heating tube and the traction component 1.

[0017] Furthermore, the outer circular surface of the bearing shaft is provided with an annular groove, which is located on the side of the fixed sleeve facing the center line of the rotating ring shaft; The discharge assembly is located on the side of the discharge position facing the center line of the rotating ring. The discharge assembly includes a horizontal seat, the direction of movement of the horizontal seat is parallel to the direction of movement of the heating chamber, and a discharge unit is provided on the horizontal seat. Multiple discharge units are provided corresponding to the bottle preforms on the carrying unit. The discharge unit includes a discharge rod disposed on the side of the horizontal seat away from the axis of the rotating ring. There are two discharge rods disposed along the axis of the rotating ring, and discharge claws extend from the opposite side of the ends of the two discharge rods.

[0018] A molding method for a plastic bottle blow molding production equipment includes heating the preform and blow molding the heated preform. Heating the preform includes the following steps: Step 1: The linear module drives the heating chamber forward, positioning the preform on the heating position's support unit within the heating chamber; At the same time, the connecting shaft moves closer to the heating chamber and moves along with the traction component, which in turn moves along with the inner heating tube, so that the inner heating tube passes through the bearing shaft and enters the preform. At the same time, the outer diameter of the inner heating tube is the same as the inner diameter of the bearing shaft, and there is friction between the two. When the inner heating tube is rotated by the motor drive, the bearing shaft rotates together with the bottle preform. Blow molding of the heated preform includes the following steps: Step 2: The two mold bases are closed by the linear module three-drive, so that the preform is located in the mold cavity; Step 3: Connecting shaft 2 moves upward, and the blow molding tube moves upward along with traction component 2, which flexibly pre-stretches the preform. When the upper end of the sliding section of the blow molding tube abuts against the lower end of fixed guide tube 2, the pre-stretching ends. Compressed air enters the preform through the main pipe, fixed guide tube 2, blow molding tube and blow molding hole to realize the blow molding operation of the preform. Step 4: After the blow molding operation is completed, the connecting shaft 2 moves down and the blow molding assembly is reset.

[0019] Compared with the prior art, the beneficial effects of this invention are as follows: I. In this case, the end of the inner heating tube is set in a conical shape, and when the end of the inner heating tube extends into the preform and continues to move, the outer circular surface of the end of the inner heating tube can fit against the inner wall of the end of the preform. Its technical advantage is: Technical effect 1: The movement of the inner heating tube is achieved through magnetic adsorption, which is flexible and can avoid rigid collision between the inner heating tube and the preform, thus preventing damage to both. Technical Effect 2: The internal heating tube is driven by a flexible magnetic adsorption force. A flexible pushing force is applied to the preform through the end of the internal heating tube. If the interference fit between the preform and the bearing shaft is qualified, the flexible pushing will not cause the preform to fall off. If the interference fit is not qualified, the preform will fall off. This is used to detect the fit between the preform and the bearing shaft and avoid problems such as the preform falling off during the subsequent blow molding process. On the other hand, since the end of the inner heating tube is set in a conical shape and continues to move after the end of the inner heating tube extends into the bottle preform, the outer circular surface of the end of the inner heating tube can fit with the inner wall of the end of the bottle preform. Therefore, it has the function of correcting the coaxiality of the bottle preform. It should be noted that when the bottle preform is fitted on the bearing shaft, it may be fitted crookedly, resulting in a coaxiality deviation between the bottle preform and the bearing shaft, which will cause the bottle preform to not be centered in the heating cavity. In this case, after correcting the coaxiality of the bottle preform, it can be ensured that the bottle preform is centered in the heating cavity, which can improve the heating uniformity of the bottle preform. Furthermore, the end of the inner heating tube is attached to the bottom of the bottle preform, which can also achieve conformal fitting of the inner wall and provide targeted heating of key parts of the bottom of the bottle preform. Second, the pre-stretching of the preform by the blow molding tube is also flexible, resulting in a better stretching effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the supporting components; Figure 4 This is a schematic diagram of the supporting unit; Figure 5 This is a schematic diagram of the heating assembly and the blow molding assembly; Figure 6 This is a schematic diagram of the heating assembly; Figure 7 This is a cross-sectional view of the heating assembly; Figure 8 This is a schematic diagram of the mold; Figure 9 This is a schematic diagram of the mold base; Figure 10 This is a schematic diagram of a blow-molded part; Figure 11 This is a cross-sectional view of the blow-molded component; Figure 12 This is a partial schematic diagram of the discharge assembly; Figure 13 A partial schematic of the driving component Figure 1 ; Figure 14 A partial schematic of the driving component Figure 2 .

[0021] The labels in the attached diagram are: 100. Frame; 101. Linear Module Four; 102. Movable Seat One; 103. Connecting Plate; 104. Vertical Connecting Hole; 105. Angled Connecting Hole; 106. Movable Seat Two; 107. Connecting Rod; 108. Horizontal Connecting Hole; 200. Bearing Assembly; 201. Motor One; 202. Rotating Ring; 203. Bearing Unit; 2031. Bearing Rod; 2032. Fixing Sleeve; 2033. Bearing Shaft; 2034. Spring; 2035. Annular Groove; 300. Heating Assembly; 301. Linear Module One; 302. Heating Chamber; 303. Heating Cavity; 304. Internal Heating Component; 3041. Fixed Conduit One; 3042. Internal Heating Pipe; 305. Traction component 1; 3051, Gear seat; 3052, Helical gear set; 3053, Outer magnet; 3054, Inner magnet; 306, Motor 2; 307, Connecting shaft 1; 400, Blow molding assembly; 401, Mold; 4011, Linear module 2; 4012, Slide block; 4013, Linear module 3; 4014, Mold base; 4015, Mold groove; 4016, Clearance opening; 402, Blow molding unit; 4021, Fixed guide tube 2; 4022, Blow molding tube; 403, Main pipe; 404, Motor 3; 405, Connecting shaft 2; 406, Traction component 2; 500, Discharge assembly; 501, Horizontal seat; 502, Discharge rod; 503, Discharge claw. Detailed Implementation

[0022] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0023] In the attached diagram of this scheme, 'a' refers to the preform.

[0024] The linear module mentioned in this solution can adopt existing lead screw linear motion technology, which will not be elaborated further.

[0025] Reference Figure 1 and Figure 2 A plastic bottle blow molding production equipment includes a frame 100, on which a support component 200, a heating component 300, a blow molding component 400, and a discharge component 500 are arranged. The support component 200 is used to support the bottle preform, the heating component 300 is used to heat the bottle preform, the blow molding component 400 is used to blow the bottle preform, and the discharge component 500 is used to pull the finished bottle obtained by blow molding away from the support component 200.

[0026] I. Load-bearing component 200: Reference Figure 3The support assembly 200 includes two rotating rings 202 arranged coaxially with their centerlines horizontal and a motor 201 for driving the rotating rings 202 to rotate. A support unit 203 is arranged between the two rotating rings 202. Four support units 203 are arranged in an array along the circumference of the rotating rings 202. Further, the position of the support unit 203 located at the lowest point of the outer surface of the rotating ring 202 is named the feeding position, the position of the support unit 203 located at the highest point of the outer surface of the rotating ring 202 is named the blow molding position, and the remaining two support units 203 are named the heating position and the discharge position, and are arranged in the following order along the rotation direction of the rotating ring 202: feeding position, heating position, blow molding position, and discharge position.

[0027] Reference Figure 4 The bearing unit 203 includes a bearing rod 2031 disposed between two rotating rings 202, and a plurality of bearing members are arranged in an array on the bearing rod 2031 along the axis of the rotating rings 202.

[0028] The support component includes a mounting hole radially disposed on the end face of the support rod 2031 along the rotating ring 202. A fixing sleeve 2032 is coaxially disposed in the mounting hole. A support shaft 2033 in the shape of a hollow shaft is fitted inside the fixing sleeve 2032, and a spring 2034 is disposed between the two. The spring force is used to drive the support shaft 2033 away from the axis of the rotating ring 202. Furthermore, the fixing sleeve 2032 has an internal step on the side facing the axis of the rotating ring 202. The outer circular surface of the support shaft 2033 forms a shoulder. The shoulder is located on the side of the internal step away from the axis of the rotating ring 202. The spring 2034 is located between the internal step and the shoulder.

[0029] Furthermore, the outer circular surface of the bearing shaft 2033 is also provided with an annular groove 2035 and a limiting ring. The limiting ring is located on the side of the fixed sleeve 2032 facing the axis of the rotating ring 202, which is used to prevent the bearing shaft 2033 from disengaging from the fixed sleeve 2032. The annular groove 2035 is located on the side of the limiting ring facing the axis of the rotating ring 202, which is used to cooperate with the discharge assembly 500 to allow the finished bottle to detach from the bearing shaft 2033.

[0030] Furthermore, manual or robotic arm technology is used to place the preform on the outside of the bearing shaft 2033, with the two forming an interference fit.

[0031] By driving the rotating ring 202 to rotate via motor 201, the carrying unit 203 can sequentially pass through the feeding position, heating position, blow molding position and discharge position, thus realizing continuous and uninterrupted blow molding operation.

[0032] II. Heating Component 300: Reference Figure 1 and Figure 2 The heating component 300 is located on one side of the heating position.

[0033] Reference Figures 5-7 The heating assembly 300 includes a heating chamber 302 and a linear module 301 that drives the heating chamber 302 to move. The heating chamber 302 moves in a horizontal direction and is perpendicular to the axis of the rotating ring 202. A heating cavity 303 is provided on the side of the heating chamber 302 facing the axis of the rotating ring 202. The heating method can adopt existing electric heating technology, which will not be described in detail.

[0034] The preform can be heated from the outside through the heating chamber 302. In order to ensure heating uniformity, the heating assembly 300 also includes an internal heating component that heats the preform from the inside.

[0035] The internal heating component and the heating chamber 302 are located on both sides of the support unit 203 of the heating position.

[0036] The internal heating component includes a connecting shaft 307 parallel to the axis of the rotating ring 202. The input end of the connecting shaft 307 is equipped with a motor 306. An internal heating unit is provided on the connecting shaft 307. The internal heating unit is used to internally heat the preform at the heating position. Since there are multiple support members on the support unit 203 at the heating position, that is, multiple preforms are supported, there are correspondingly multiple internal heating units.

[0037] The internal heating unit includes an internal heating element 304 and a traction element 305.

[0038] The internal heating element 304 includes a fixed conduit 3041 fixedly mounted on the frame 100 and parallel to the moving direction of the heating chamber 302. An internal heating tube 3042 is sleeved inside the fixed conduit 3041. The internal heating tube 3042 can be implemented using existing heating technology, which will not be described in detail.

[0039] The traction component 305 includes a gear seat 3051 with two sleeve holes. These two sleeve holes are respectively fitted onto the connecting shaft 307 and the fixed guide tube 3041. A helical gear set 3052 is housed within the gear seat 3051. The driving helical gear of the helical gear set 3052 is mounted on the connecting shaft 307, and the driven helical gear of the helical gear set 3052 is movably fitted onto the fixed guide tube 3041. The inner wall of the driven helical gear is inlaid with a series of... There are several outer magnets 3053 and several inner magnets 3054 arranged in an array along the circumferential direction on the outer wall of the inner heating tube 3042. The magnetic poles of the outer magnets 3053 and the inner magnets 3054 are opposite to each other, and there is a magnetic attraction force. Therefore, when the traction component 305 moves on the fixed guide tube 3041, it moves the inner heating tube 3042 together with it through the magnetic attraction force. When the motor 306 drives the driven helical gear to rotate, it rotates the inner heating tube 3042 together with it through the magnetic attraction force.

[0040] The heating process of the heating component 300 on the preform on the support unit 203 of the heating position is specifically manifested as follows: First, the linear module 301 drives the heating chamber 302 to move backward, preventing the rotating ring 202 from rotating with the support unit 203. After the rotation is completed, the linear module 301 drives the heating chamber 302 forward, so that the preform on the support unit 203 at the heating position is located in the heating chamber 303. At the same time, the connecting shaft 307 moves closer to the heating chamber 302 and moves together with the traction component 305. The traction component 305 moves together with the inner heating tube 3042, so that the inner heating tube 3042 passes through the bearing shaft 2033 and enters the preform. Meanwhile, the outer diameter of the inner heating tube 3042 is the same as the inner diameter of the bearing shaft 2033, and there is friction between them. Therefore, when the inner heating tube 3042 is driven to rotate by the motor 206, the bearing shaft 2033 rotates with the bottle preform, which can make the inner and outer heating of the bottle preform more even. It should be noted that the inner heating tube 3042 is not entirely made of thermally conductive material. The part of the inner heating tube 3042 that contacts the bearing shaft 2033 is made of thermally insulating material, while the part that extends into the preform is made of thermally conductive material. It is equipped with a heating element inside, so only the part of the preform other than the bottle mouth is heated.

[0041] In addition, the heating component 300 also has the following technical advantages: Reference Figure 7 The end of the inner heating tube 3042 is set in a conical shape and the taper of the end of the inner heating tube 3042 is consistent with the taper of the inner wall of the end of the bottle preform. When the end of the inner heating tube 3042 extends into the bottle preform and continues to move, the outer circular surface of the end of the inner heating tube 3042 can fit against the inner wall of the end of the bottle preform.

[0042] Technical effect 1: The movement of the inner heating tube 3042 is achieved by magnetic adsorption force, which is flexible and can avoid rigid collision between the inner heating tube 3042 and the preform, thus preventing damage to both. Technical Effect 2: The internal heating tube 3042 is moved by a flexible drive method using magnetic adsorption. A flexible pushing force is applied to the preform through the end of the internal heating tube 3042. If the interference fit between the preform and the bearing shaft 2033 is qualified, the flexible pushing will not cause the preform to fall off. If the interference fit is not qualified, the preform will fall off. This is used to detect the fit between the preform and the bearing shaft 2033 and avoid problems such as the preform falling off during the subsequent blow molding process. On the other hand, since the end of the inner heating tube 3042 is set in a conical shape and when the end of the inner heating tube 3042 extends into the bottle preform and continues to move, the outer circular surface of the end of the inner heating tube 3042 can fit with the inner wall of the end of the bottle preform. Therefore, it has the function of correcting the coaxiality of the bottle preform. It should be noted that when the bottle preform is fitted onto the bearing shaft 2033, it may be fitted crookedly, resulting in a coaxiality deviation between the bottle preform and the bearing shaft 2033. This would cause the bottle preform to not be centered in the heating cavity 303. In this case, after correcting the coaxiality of the bottle preform, it can be ensured that the bottle preform is centered in the heating cavity 303, which can improve the heating uniformity of the bottle preform. Furthermore, the end of the inner heating tube 3042 is attached to the bottom of the preform, which can achieve conformal fitting of the inner wall and provide targeted heating of key parts of the bottom of the preform.

[0043] III. Blow-molded components 400: Reference Figure 1 and Figure 2 The blow molding assembly 400 includes a mold 401 and a blow molding component, with the mold 401 located above the heating position and the blow molding component located below the heating position.

[0044] Reference Figure 8 and Figure 9 The mold 401 includes a slide 4012 and a linear module 4011 that drives the slide 4012 to move. The direction of movement of the slide 4012 is parallel to the axis of the rotating ring 202.

[0045] The slide block 4012 is equipped with two mold bases 4014 and a linear module 3 4013 that drives the two mold bases 4014 to move closer or further apart. The moving direction of the mold bases 4014 is horizontally arranged and perpendicular to the axis of the rotating ring 202. The two mold bases 4014 are distributed along the moving direction of the mold bases 4014. On the opposite side of the two mold bases 4014, there are mold grooves 4015 and clearance openings 4016. Both are arranged in an array of several along the axis of the rotating ring 202 and are arranged in an alternating manner. When the two mold bases 4014 are closed, the mold grooves 4015 on the two mold bases 4014 form a mold cavity. The clearance openings 4016 are provided to avoid the rotating ring 202 rotating with the preform and the finished bottle.

[0046] Reference Figure 10 and Figure 11 The blow molding component includes a connecting shaft 405 parallel to the axis of the rotating ring 202 and a blow molding unit 402 located below the mold cavity.

[0047] The input end of the connecting shaft 2 405 is equipped with motor 3 404.

[0048] The blow molding unit 402 includes a fixed guide tube 4021 fixedly mounted on the frame 100 and arranged vertically. A blow molding tube 4022 is sleeved inside the fixed guide tube 4021. Further, the blow molding tube 4022 is divided along the axis into a sliding section that forms a sliding guide engagement with the fixed guide tube 4021 and a stretching section provided at the upper end of the sliding section. The outer circular surface of the stretching section is provided with a blow molding hole.

[0049] The bearing shaft 2033 of the bearing unit 203 located in the blow molding position is coaxial with the blow molding tube 4022 of the corresponding blow molding unit 402.

[0050] All the fixed conduits 4021 of the blow molding units 402 are connected to each other through the main pipe 403, which is connected to an air compressor that provides compressed air.

[0051] A traction component 406 is provided between the connecting shaft 2 405 and the fixed conduit 2 4021. The structure of the traction component 2 406 is the same as that of the traction component 1 305. The connection relationship between the connecting shaft 2 405, the fixed conduit 2 4021, the blow molding tube 4022 and the traction component 2 406 is the same as that between the connecting shaft 1 307, the fixed conduit 1 3041, the internal heating tube 3042 and the traction component 1 305.

[0052] The blow molding process of the blow molding assembly 400 on the heated preform is specifically manifested as follows: First, the linear module 4011 drives the slide 4012 and the mold base 4014 to move, so that the clearance 4016 is located on the rotation trajectory of the bottle preform of the carrying component 200, thereby enabling the heated bottle preform to be located in the area between the two mold bases 4014. Then, the second linear module 4011 runs in reverse, so that the preform is located between the two mold slots 4015. The third linear module 4013 drives the two mold bases 4014 to close the mold, so that the preform is located in the mold cavity. Then, the connecting shaft 405 moves upward, and the blow molding tube 4022 moves upward together with the traction component 406 to perform flexible pre-stretching on the preform. The pre-stretching effect is better. When the upper end of the sliding section of the blow molding tube 4022 contacts the lower end of the fixed guide tube 4021, the pre-stretching ends. Compressed air enters the preform through the main pipe 403, the fixed guide tube 4021, the blow molding tube 4022 and the blow molding hole to realize the blow molding operation of the preform. After the blow molding operation is completed, connecting shaft 2 405 moves down and blow molding assembly 400 resets; Then, the mold base 4014 is opened by the linear module 3 4013, and the finished bottle is positioned at the clearance opening 4016 by the linear module 2 4011. Then, the rotating ring 202 rotates, so that the next batch of heated bottle preforms is in the heating position and the finished bottle is in the discharge position.

[0053] IV. Discharge assembly 500: Reference Figure 1 and Figure 2 The discharge assembly 500 is located on the side of the discharge position facing the axis of the rotating ring 202.

[0054] Reference Figure 12 The discharge assembly 500 includes a horizontal seat 501, the moving direction of the horizontal seat 501 is parallel to the moving direction of the heating chamber 302, and a discharge unit is provided on the horizontal seat 501 for discharging finished bottles on the bearing unit 203 of the discharge position. Multiple discharge units are provided accordingly.

[0055] The discharge unit includes a discharge rod 502 disposed on the side of the horizontal seat 501 opposite to the axis of the rotating ring 202. There are two discharge rods 502 disposed along the axis of the rotating ring 202, and discharge claws 503 extend from the opposite side of the ends of the two discharge rods 502.

[0056] After the rotating ring 202 completes its rotation with the finished bottle, the ends of the two discharge claws 503 can be located in the annular groove 2035 on the bearing shaft 2033 of the corresponding bearing unit 203. Then the horizontal seat 501 moves backward and pulls the bearing shaft 2033 backward, so that the finished bottle can be detached from the bearing shaft 2033.

[0057] V. Driver Components: The drive assembly is used to move the connecting shaft 307, the connecting shaft 405, and the cross seat 501.

[0058] Specifically, refer to Figure 13 and Figure 14 The drive assembly includes a movable seat 102 and a linear module 4 101 that drives the movable seat 102 to move in the vertical direction. The connecting shaft 2 405 and the motor 3 404 are both mounted on the movable seat 102. Therefore, when the movable seat 102 is driven to move by the linear module 4 101, the connecting shaft 2 405 will also move.

[0059] The drive assembly also includes a second movable seat 106, the moving direction of which is parallel to the moving direction of the heating chamber 302. The second motor 306 and the first connecting shaft 307 are both mounted on the second movable seat 106.

[0060] The drive assembly also includes a linkage plate 103 and a linkage rod 107.

[0061] The connecting plate 103 is provided with a vertically arranged vertical connecting hole 104 and an inclined connecting hole 105. The second connecting shaft 405 passes through the vertical connecting hole 104, and the first connecting shaft 307 passes through the inclined connecting hole 105. The distance between the inclined connecting hole 105 and the vertical connecting hole 104 decreases from bottom to top.

[0062] Therefore, when the second connecting shaft 405 moves upward to contact the upper wall of the vertical connecting hole 104, it will move upward along with the connecting plate 103. At this time, the connecting plate 103 drives the first connecting shaft 307 to move closer to the heating chamber 302 through the oblique connecting hole 105. It should be noted that the vertical connecting hole 104 exists because the moving distances of the first connecting shaft 307 and the second connecting shaft 405 are not the same, and it plays a role in offsetting the stroke.

[0063] The linkage 107 is connected to the cross seat 501. The linkage 107 is provided with a horizontal linkage hole 108 parallel to the moving direction of the cross seat 501. The connecting shaft 307 passes through the horizontal linkage hole 108. Similarly, when the connecting shaft 307 moves to contact the hole wall of the horizontal linkage hole 108, it will move the linkage 107 and the cross seat 501 together, causing the cross seat 501 to move backward. The horizontal linkage hole 108 also serves to counteract the stroke.

[0064] In addition, the drive assembly can also use three separate telescopic rod structures to drive the connecting shaft 307, connecting shaft 405 and cross seat 501 to move.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A plastic bottle blow molding production equipment, comprising a frame (100), wherein a load-bearing component (200), a heating component (300), a blow molding component (400), and a discharge component (500) are disposed on the frame (100), characterized in that, The support assembly (200) includes two rotating rings (202) with horizontal axis and coaxial arrangement, and a motor (201) for driving the rotating rings (202) to rotate. A support unit (203) is provided between the two rotating rings (202), and four support units (203) are arranged in an array along the circumferential direction of the rotating rings (202). The location of the bearing unit (203) at the lowest point of the outer circle of the rotating ring (202) is named the feeding position, the location of the bearing unit (203) at the highest point of the outer circle of the rotating ring (202) is named the blow molding position, and the locations of the remaining two bearing units (203) are named the heating position and the discharge position respectively. Along the rotation direction of the rotating ring (202), they are the feeding position, heating position, blow molding position and discharge position in sequence. The heating assembly (300) includes an inner heating component, a heating chamber (302), and a linear module (301) that drives the heating chamber (302) to move. The heating chamber (302) moves in a horizontal direction and is perpendicular to the axis of the rotating ring (202). A heating cavity (303) is provided on the side of the heating chamber (302) facing the axis of the rotating ring (202). The inner heating component is used to heat the preform from the inside.

2. The plastic bottle blow molding production equipment according to claim 1, characterized in that, The bearing unit (203) includes a bearing rod (2031) disposed between two rotating rings (202), and a plurality of bearing members are arranged in an array on the bearing rod (2031) along the axis of the rotating rings (202); The support component includes a mounting hole radially disposed on the end face of the support rod (2031) along the rotating ring (202). A fixing sleeve (2032) is coaxially disposed in the mounting hole. A support shaft (2033) in the shape of a hollow shaft is sleeved inside the fixing sleeve (2032), and a spring (2034) is disposed between the two. The elastic force of the spring (2034) drives the support shaft (2033) away from the axis of the rotating ring (202).

3. A plastic bottle blow molding production equipment according to claim 1 or 2, characterized in that, The internal heating element and the heating chamber (302) are located on opposite sides of the heating position; The internal heating component includes a connecting shaft 1 (307) parallel to the axis of the rotating ring (202). The input end of the connecting shaft 1 (307) is equipped with a motor 2 (306). An internal heating unit is provided on the connecting shaft 1 (307). Multiple internal heating units are provided corresponding to the bottle preform on the bearing unit (203). The internal heating unit includes an internal heating element (304) and a traction element 1 (305). The internal heating element (304) includes a fixed conduit (3041) fixedly mounted on the frame (100) and parallel to the moving direction of the heating chamber (302), and an internal heating tube (3042) is sleeved inside the fixed conduit (3041).

4. The plastic bottle blow molding production equipment according to claim 3, characterized in that, The first traction component (305) includes a gear seat (3051). The gear seat (3051) has two sleeve holes, which are respectively fitted onto the first connecting shaft (307) and the first fixed guide tube (3041). A helical gear set (3052) is provided inside the gear seat (3051). The driving helical gear of the helical gear set (3052) is set on the first connecting shaft (307), and the driven helical gear of the helical gear set (3052) is movably fitted onto the first fixed guide tube (3041). Several external magnets (3053) are inlaid in an array along the circumferential direction on the inner wall of the driven helical gear. Several internal magnets (3054) are inlaid in an array along the circumferential direction on the outer wall of the inner heating tube (3042). The magnetic poles of the external magnets (3053) and the internal magnets (3054) are opposite.

5. The plastic bottle blow molding production equipment according to claim 4, characterized in that, The end of the inner heating tube (3042) is set in a conical shape and when the end of the inner heating tube (3042) extends into the preform and continues to move, the outer circular surface of the end of the inner heating tube (3042) can fit against the inner wall of the end of the preform.

6. The plastic bottle blow molding production equipment according to claim 4, characterized in that, The blow molding assembly (400) includes a mold (401) and a blow molding part, wherein the mold (401) is located above the heating position and the blow molding part is located below the heating position; The mold (401) includes a slide (4012) and a linear module two (4011) that drives the slide (4012) to move. The moving direction of the slide (4012) is parallel to the axis of the rotating ring (202). Two mold bases (4014) and a linear module three (4013) that drives the two mold bases (4014) to move closer or further apart are installed on the slide (4012). The moving direction of the mold bases (4014) is arranged horizontally and perpendicular to the axis of the rotating ring (202). The two mold bases (4014) are distributed along the moving direction of the mold bases (4014). On the opposite side of the two mold bases (4014), there are mold grooves (4015) and clearance openings (4016). Both are arranged in multiple arrays along the axis of the rotating ring (202) and are arranged in an alternating manner.

7. The plastic bottle blow molding production equipment according to claim 6, characterized in that, The blow molding component includes a connecting shaft 2 (405) parallel to the axis of the rotating ring (202) and a blow molding unit (402) located below the mold cavity; The input end of the connecting shaft two (405) is equipped with motor three (404). The blow molding unit (402) includes a fixed guide tube (4021) fixedly mounted on the frame (100) and arranged vertically. A blow molding tube (4022) is sleeved inside the fixed guide tube (4021). The blow molding tube (4022) is divided into a sliding section that forms a sliding guide fit with the fixed guide tube (4021) along the axis and a stretching section provided at the upper end of the sliding section. The outer circular surface of the stretching section is provided with a blow molding hole. The bearing shaft (2033) of the bearing unit (203) located in the blow molding position is coaxial with the blow molding tube (4022) of the corresponding blow molding unit (402); All blow molding units (402) are connected to each other via a main pipe (403) through the lower openings of the fixed conduit two (4021).

8. The plastic bottle blow molding production equipment according to claim 7, characterized in that, A traction component 2 (406) is provided between the connecting shaft 2 (405) and the fixed conduit 2 (4021). The structure of the traction component 2 (406) is the same as that of the traction component 1 (305). The connection relationship between the connecting shaft 2 (405), the fixed conduit 2 (4021), the blow molding tube (4022) and the traction component 2 (406) is the same as that between the connecting shaft 1 (307), the fixed conduit 1 (3041), the internal heating tube (3042) and the traction component 1 (305).

9. The plastic bottle blow molding production equipment according to claim 5, characterized in that, The outer circular surface of the bearing shaft (2033) is provided with an annular groove (2035), which is located on the side of the fixed sleeve (2032) facing the axis of the rotating ring (202); The discharge assembly (500) is located on the side of the discharge position facing the axis of the rotating ring (202). The discharge assembly (500) includes a cross seat (501). The moving direction of the cross seat (501) is parallel to the moving direction of the heating chamber (302). The cross seat (501) is provided with discharge units. Multiple discharge units are provided corresponding to the preforms on the bearing unit (203). The discharge unit includes a discharge rod (502) disposed on the side of the horizontal seat (501) away from the axis of the rotating ring (202). There are two discharge rods (502) along the axis of the rotating ring (202), and discharge claws (503) extend from the opposite side of the ends of the two discharge rods (502).

10. The molding method of a plastic bottle blow molding production equipment as described in claim 8, characterized in that, This includes heating the preform and blow molding the heated preform; Heating the preform includes the following steps: Step 1: The linear module 1 (301) drives the heating chamber (302) forward, so that the preform on the bearing unit (203) of the heating position is located in the heating chamber (303); At the same time, the connecting shaft 1 (307) moves closer to the heating chamber (302) and moves together with the traction component 1 (305). The traction component 1 (305) moves together with the inner heating tube (3042), so that the inner heating tube (3042) passes through the bearing shaft (2033) and enters the preform. At the same time, the outer diameter of the inner heating tube (3042) is the same as the inner diameter of the bearing shaft (2033), and there is friction between them. When the inner heating tube (3042) is driven to rotate by the motor (306), the bearing shaft (2033) rotates together with the bottle preform. Blow molding of the heated preform includes the following steps: Step 2: Drive the two mold bases (4014) to close the mold through the linear module three (4013), so that the preform is located in the mold cavity; Step 3: The connecting shaft 2 (405) moves upward, and the blow molding tube (4022) moves upward together through the traction component 2 (406) to perform flexible pre-stretching on the preform. When the upper end of the sliding section of the blow molding tube (4022) abuts against the lower end of the fixed guide tube 2 (4021), the pre-stretching ends. Compressed air enters the preform through the main pipe (403), the fixed guide tube 2 (4021), the blow molding tube (4022) and the blow molding hole to realize the blow molding operation of the preform. Step 4: After the blow molding operation is completed, the connecting shaft 2 (405) moves down and the blow molding assembly (400) is reset.

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