Plastic extrusion full-automatic bottle blowing machine and working method thereof

Abstract

The invention relates to the field of plastic bottle production, and discloses a plastic extrusion full-automatic bottle blowing machine which comprises a conveying line, a bottle blowing component and a heating chamber are arranged above the conveying line, the conveying line comprises two chain wheel chain wheels and a clamping assembly, the clamping assembly comprises a support arranged between two chains, a clamping unit is arranged on the support, and the clamping unit is connected with the conveying line. The clamping unit comprises a mounting hole formed in the support, when the clamping assembly is located on the horizontally-arranged part of the chain, the axis of the mounting hole is vertically arranged, a rotating shaft is arranged in the mounting hole in a sleeved mode, a clamping base is arranged at the upper end of the rotating shaft, and a clamping ring and a fixing pipe are arranged on the upper surface of the clamping base; a built-in step is arranged at the position of an upper pipe opening of the fixed pipe, a piston is arranged in the fixed pipe in a sleeved mode, a movable pipe is arranged on the upper end face of the piston, the upper end of the movable pipe penetrates through the built-in step and then is provided with a hemispherical stretching head, and the movable pipe is sleeved with a first spring located between the piston and the built-in step.

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 fully automatic plastic extrusion blow molding machine and its working 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 employs a two-step process. The first step is injection molding of the preform, and the second step is reheating the preform and blow molding it into a bottle. The second step is generally achieved using an automatic blow molding machine. Furthermore, stretching and blow molding are the core processes of the blow molding machine, including transferring the preform into the blow molding mold and closing the mold, pre-stretching, high-pressure blow molding, holding pressure and cooling to solidify, and venting and mold opening. Even further, after pre-stretching, high-pressure blow molding must be performed immediately (almost simultaneously). This is a precise and time-sensitive process, with time differences typically on the order of milliseconds. If blow molding is not performed immediately after stretching, the preform will cool in certain areas, easily leading to issues such as whitening of the bottle body, uneven thickness, wrinkles, or even cracking.

[0004] In the existing technology, the "immediate" connection between pre-stretching and high-pressure blow molding is achieved by a precision sensor system. At the instant the stretching rod reaches the preset position, the sensor and the actuator work together to immediately open the high-pressure air circuit for high-pressure blow molding. The time interval between the two needs to be controlled at the millisecond level. This places very high demands on the accuracy of the sensor, the response performance of the actuator, and the coordination between the two. High-precision structures are not only expensive but also relatively complex and have a short service life.

[0005] Based on the above, the present invention proposes a fully automatic plastic extrusion blow molding machine and its working method. Summary of the Invention

[0006] To address the problems mentioned in the background above, the present invention provides a fully automatic plastic extrusion blow molding machine and its operating method.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0008] A fully automatic plastic extrusion blow molding machine includes a conveyor line and a blow molding component and a heating chamber located above the conveyor line. The conveyor line includes a sprocket chain condition and a clamping assembly. The sprockets of the sprocket chain condition are arranged horizontally and there are two sprocket chain conditions arranged along the axis of the sprockets. The clamping assembly includes a support disposed between the chains of the two sprocket chain conditions, and a clamping unit is disposed on the support.

[0009] The clamping unit includes a mounting hole on the support. When the clamping assembly is located on the horizontally arranged part of the chain, the axis of the mounting hole is vertically arranged and a rotating shaft is fitted inside the mounting hole. The rotating shaft is hollow and a clamping seat is provided at the upper end of the rotating shaft. A clamping ring and a fixing tube are provided on the upper surface of the clamping seat. The clamping ring, the fixing tube and the rotating shaft are coaxial.

[0010] The fixed tube is located inside the clamping ring. An internal step is provided at the upper opening of the fixed tube. A piston is sleeved inside the fixed tube. A movable tube is provided on the upper end face of the piston. The upper end of the movable tube passes through the internal step and is provided with a hemispherical stretching head. The movable tube and the internal step form a sealed sliding guide fit. A spring is sleeved on the outside of the movable tube and located between the piston and the internal step.

[0011] Furthermore, a connecting hole is provided on the lower end face of the fixed tube, and the end of the connecting hole penetrates through the inner wall of the fixed tube and is close to the built-in step. The rotating shaft and the connecting hole are connected through a connecting channel.

[0012] The outer circumference of the piston is provided with an annular groove, and a side hole is provided through the bottom of the annular groove;

[0013] The interior of the stretching head is hollow and connected to the movable tube, and the outer surface of the stretching head is provided with blow molding holes.

[0014] Furthermore, an exhaust channel is provided on the lower end face of the rotating shaft, and the end of the exhaust channel extends through to the upper surface of the clamping seat and is located between the fixing tube and the clamping ring.

[0015] Furthermore, multiple clamping assemblies are arranged in an array along the moving direction of the sprocket chain, and two clamping units are arranged on the support along the axis of the sprocket.

[0016] The outer surface of the clamping ring and the inner surface of the preform form an interference fit.

[0017] Furthermore, a mounting base is provided in the area between the two sprocket chains, located below the heating chamber, and a rotating assembly is provided on the mounting base for driving the preform located in the heating chamber to rotate.

[0018] Furthermore, an upper rotating body is provided on the outside of the lower end of the rotating shaft, and multiple upper magnets are arranged in an array along the circumferential direction on the lower surface of the upper rotating body;

[0019] The rotating assembly includes a drive shaft arranged vertically and mounted on a mounting base, and a motor for driving the drive shaft to rotate. A lower rotating body is provided at the upper end of the drive shaft, and multiple lower magnets are arranged in an array along the circumferential direction on the upper surface of the lower rotating body.

[0020] During the movement of the sprocket chain-driven clamping assembly, the upper rotating body of the clamping assembly can be located directly above the lower rotating body and the two are close to each other. Multiple rotating assemblies are correspondingly provided.

[0021] Furthermore, the blow molding component includes a fixed bracket, on which a guide rod parallel to the sprocket is provided, and a mold unit is provided on the guide rod. The mold unit includes a side mold that is slidably connected to the guide rod. There are two side molds and a spring is provided between the two side molds. Each of the two side molds has a mold groove on the side facing each other. When the two side molds are in contact with each other, the two mold grooves together form a mold cavity.

[0022] The fixed bracket is also equipped with a drive assembly for driving the mold unit to close.

[0023] Furthermore, the drive assembly includes a lifting bracket and a linear module for driving the lifting bracket to move in the vertical direction. The bottom of the lifting bracket is provided with a side insert rod and a center insert rod located above the two side molds respectively.

[0024] The bottom of the side insert rod is provided with an upper inclined surface one, the bottom of the middle insert rod is provided with an upper inclined surface two, the top of one side mold is provided with a lower inclined surface one, and the top of the other side mold is provided with a lower inclined surface two. During the downward movement of the side insert rod and the middle insert rod, the upper inclined surface one contacts the lower inclined surface one and the upper inclined surface two contacts the lower inclined surface two. With the cooperation of the four, the two side molds can be driven to move closer to each other.

[0025] Furthermore, a lifting seat is provided between the two sprocket chain conditions, located below the mold unit. When the clamping assembly is located directly below the mold unit, the lifting seat is located below the clamping assembly. A blow molding unit is provided on the lifting seat, and multiple blow molding units are provided corresponding to the number of mold cavities.

[0026] The blow molding unit includes a sliding hole on the lifting seat, a blow molding tube is slidably sleeved in the sliding hole, a blow molding head is provided at the upper end of the blow molding tube, and a spring four is sleeved on the outside of the blow molding tube between the lifting seat and the blow molding head. The blow molding tube is coaxial with the mold cavity after mold closing.

[0027] The fixed bracket is provided with a vertically arranged rack 1, a gear meshing with rack 1, and a vertically arranged rack 2 meshing with the gear. A spring 3 is provided between rack 1 and the fixed bracket to drive rack 1 upward. Rack 1 and rack 2 are located on both sides of the gear. During the downward movement of the lifting bracket, the rack 1 can be pushed downward.

[0028] The rack and pinion are connected to the lifting seat.

[0029] A working method of a fully automatic plastic extrusion blow molding machine:

[0030] Step 1: Place the preform over the outside of the clamping ring;

[0031] Step 2: The sprocket chain pulls the clamping assembly and the preform to move, so that the preform is placed in the heating chamber to be heated;

[0032] Step 3: Continue to move the clamping assembly and preform by using the sprocket chain to position the heated preform between the two side molds of the mold unit;

[0033] Step 4: The linear module drives the lifting bracket to move down. The lifting bracket moves down together with the side insert rod and the middle insert rod. With the cooperation of the first lower inclined surface and the first upper inclined surface, as well as the second lower inclined surface and the second upper inclined surface, the two side molds of the mold unit approach each other and the mold closing action occurs. The preform is located in the mold cavity after the mold is closed.

[0034] At the same time as the mold is closed, the lifting bracket pushes the rack down. When the rack moves down, it drives the rack up through the gear. The rack moves up along with the lifting seat, and the lifting seat moves up along with the blow molding unit, so that the blow molding head contacts the lower end of the rotating shaft. At this time, the lower opening of the exhaust channel is blocked, and the rotating shaft is connected to the blow molding head.

[0035] Step 5: The compressor starts, and air flows into the rotating shaft through the blow molding tube and blow molding head, thereby pushing the piston upward. The piston, along with the movable tube and the stretching head, moves upward, and the stretching head moves upward to achieve axial stretching of the preform.

[0036] When the preform approaches the top of the mold cavity, the annular groove connects with the upper opening of the connecting hole. After that, air flows into the preform through the rotating shaft, connecting channel, connecting hole, annular groove, side hole, movable tube, stretching head and blow molding hole to perform high-pressure blow molding on the preform.

[0037] Step Six: After the preset time, the high-pressure blow molding is completed. Wait for the preset time again to complete the pressure holding, cooling, and shaping process.

[0038] Step 7: The linear module drives the lifting bracket to move upward, causing the mold unit to open. At the same time, the blow molding unit moves downward and resets, the contact between the blow molding head and the rotating shaft is removed, the lower opening of the exhaust channel is opened, and the high-pressure gas in the plastic bottle is discharged through the exhaust channel.

[0039] Step 8: After the plastic bottles are blown and removed by the sprocket chain, the next batch of heated preforms are located between the two side molds of the mold unit. Then, steps 4-7 are repeated.

[0040] Compared with the prior art, the beneficial effects of this invention are as follows:

[0041] I. This case utilizes a telescopic clamping unit constructed from components such as fixed and movable tubes, which, in conjunction with a blow molding unit, enables the blow molding of bottle preforms. Its technical advantages are:

[0042] Technical effect 1: It can not only achieve axial pre-stretching of heated bottle preforms, but also high-pressure blow molding of bottle preforms, resulting in a more simplified structure;

[0043] Technical Effect 2: In this case, when the stretching head of the movable tube completes the axial pre-stretching of the preform, bringing the preform close to the top of the mold cavity, the blow molding head and the preform can be connected, and high-pressure blow molding of the preform can begin. In other words, there is a seamless connection between axial pre-stretching and high-pressure blow molding, which can solve the problem mentioned in the background technology that "the time interval between pre-stretching and high-pressure blow molding is at the millisecond level, which requires very high precision from the relevant system" and improve the blow molding quality.

[0044] Second, this design utilizes the mold-closing action to bring the blow molding head into contact with the rotating shaft of the clamping unit, thus completing the construction of the blow molding structure. The technical advantages are:

[0045] Technical effect 3: This design utilizes the downward pressure of mold closing to achieve the connection between the blow molding head and the rotating shaft at the same time as mold closing. That is, the air passage of the blow molding structure is also connected at the same time as mold closing, and pre-stretching can be performed immediately, which is highly efficient.

[0046] Technical effect 4: This design utilizes the downward pressure of mold closing to enable the blowing unit to connect with the clamping unit where the blow-molded plastic bottle is located. This allows the plastic bottle to be blown off the clamping unit by airflow, resulting in smoother and more stable unloading without damaging the plastic bottle. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the present invention;

[0048] Figure 2 This is a side view of the conveyor line and the blow molding components;

[0049] Figure 3 This is a schematic diagram of the conveyor line structure;

[0050] Figure 4 This is a schematic diagram of the clamping component and the rotating component;

[0051] Figure 5 This is a schematic diagram of the clamping assembly.

[0052] Figure 6 This is a cross-sectional view of the clamping unit;

[0053] Figure 7 This is an exploded view of the fixed tube and the movable tube;

[0054] Figure 8 This is a structural schematic diagram of a blown bottle component;

[0055] Figure 9 A schematic diagram of the guide rod, mold unit, and drive assembly. Figure 1 ;

[0056] Figure 10 Schematic diagram of guide rod, mold unit and drive assembly Figure 2 .

[0057] The labels in the attached diagram are:

[0058] 100. Conveyor line; 101. Sprocket chain condition; 102. Clamping assembly; 103. Support; 104. Upper rotating body; 105. Upper magnet; 106. Rotating shaft; 107. Clamping seat; 108. Clamping ring; 109. Exhaust channel; 110. Fixed tube; 111. Movable tube; 112. Stretching head; 113. Spring 1; 114. Blow molding hole; 115. Connecting channel; 116. Connecting hole; 117. Piston; 118. Side hole; 200. Bottle blowing component; 201. Fixed bracket; 202. Linear module; 203. Lifting bracket; 204. 205. Side insert rod; 206. Middle insert rod; 207. Guide rod; 208. Side mold one; 209. Side mold two; 200. Spring two; 210. Rack one; 211. Spring three; 212. Gear; 213. Rack two; 214. Lifting seat; 215. Blow molding tube; 216. Blow molding head; 217. Spring four; 300. Heating chamber; 301. Rotating assembly; 3011. Motor; 3012. Drive shaft; 3013. Lower rotating body; 3014. Lower magnet; 400. Material receiving box; 401. Auxiliary seat; 402. Spring five; 403. Connecting rod. Detailed Implementation

[0059] 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, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0060] In the attached diagram of this plan, a refers to the preform and b refers to the blow-molded plastic bottle.

[0061] Reference Figures 1-10 A fully automatic plastic extrusion blow molding machine includes a conveyor line 100 and a blow molding component 200 and a heating chamber 300 located above the conveyor line 100. The conveyor line 100 is used to pull the preform to move. During the movement of the preform, it will pass through the heating chamber 300 and the blow molding component 200 in sequence. The heating chamber 300 heats the preform, and the blow molding component 200 is used to blow the preform.

[0062] Conveyor line 100:

[0063] Reference Figure 3The conveyor line 100 includes a sprocket chain condition 101. The sprocket chain technology is available from the prior art and will not be described in detail. The sprockets of the sprocket chain condition 101 are arranged horizontally, and there are two sprocket chain conditions 101 arranged along the axis of the sprockets. A clamping assembly 102 is arranged between the chains of the two sprocket chain conditions 101. Multiple clamping assemblies 102 are arranged in an array along the moving direction of the sprocket chain condition 101.

[0064] The clamping assembly 102 can be moved by the sprocket chain condition 101.

[0065] Reference Figure 4 and Figure 5 The clamping assembly 102 includes a support 103 disposed between the chains of the two sprocket chain conditions 101, and a clamping unit is disposed on the support 103. Furthermore, two clamping units are disposed along the axis of the sprocket.

[0066] Reference Figures 5-7 The clamping unit includes mounting holes provided on the support 103. When the clamping assembly 102 is located on the horizontally arranged portion of the chain, the axis of the mounting hole is vertically arranged. Taking the clamping assembly 102 located above the chain as an example:

[0067] A rotating shaft 106 is fitted inside the mounting hole, for example, via a bearing. The rotating shaft 106 is a hollow shaft. A clamping seat 107 is provided at the upper end of the rotating shaft 106. A clamping ring 108 and a fixing tube 110 are provided on the upper surface of the clamping seat 107. The clamping ring 108, the fixing tube 110 and the rotating shaft 106 are coaxial. The outer circular surface of the clamping ring 108 and the inner circular surface of the preform form an interference fit. Therefore, the preform can be fitted onto the clamping ring 108 by a robot or manually.

[0068] The fixed tube 110 is located inside the clamping ring 108. An internal step is provided at the upper opening of the fixed tube 110. A piston 117 is sleeved inside the fixed tube 110. A movable tube 111 is provided on the upper end face of the piston 117. After the upper end of the movable tube 111 passes through the internal step, a hemispherical stretching head 112 is provided. The movable tube 111 and the internal step form a sealed sliding guide fit. A spring 113 is sleeved on the outside of the movable tube 111, located between the piston 117 and the internal step.

[0069] Furthermore, an exhaust channel 109 is provided on the lower end face of the rotating shaft 106. The end of the exhaust channel 109 extends through to the upper surface of the clamping seat 107 and is located between the fixing tube 110 and the clamping ring 108.

[0070] The lower end face of the fixed tube 110 is provided with a connecting hole 116. The end of the connecting hole 116 extends through the inner wall of the fixed tube 110 and is close to the built-in step. The rotating shaft 106 and the connecting hole 116 are connected through a connecting channel 115.

[0071] The outer surface of the piston 117 is provided with an annular groove, and a side hole 118 is provided through the bottom of the annular groove.

[0072] The interior of the stretching head 112 is hollow and connected to the movable tube 111. The outer surface of the stretching head 112 is provided with a blow molding hole 114.

[0073] By cooperating with the spring 113 and the blow molding component 200, the movable tube 111 can be driven to extend and retract within the fixed tube 110, thereby achieving pre-stretching of the preform and high-pressure blow molding. The specific process and advantages will be described in detail later.

[0074] Heating chamber 300:

[0075] Reference Figure 1 The heating chamber 300 is located above the sprocket chain condition 101. The preform can be pulled into the heating chamber 300 by the sprocket chain condition 101 and subjected to heating. The heating method of the heating chamber 300 can be achieved using existing technology, such as existing electric heating technology, etc., which will not be elaborated here.

[0076] Furthermore, in order to improve the uniformity of heating, thereby indirectly improving the quality of subsequent blow molding operations, refer to... Figure 3 A mounting base located below the heating chamber 300 is provided in the area between the two sprocket chain conditions 101. A rotating component 301 is provided on the mounting base to drive the preform located in the heating chamber 300 to rotate.

[0077] Specifically, refer to Figure 4 and Figure 5 An upper rotating body 104 is provided on the outer side of the lower end of the rotating shaft 106, and multiple upper magnets 105 are arranged in an array along the circumferential direction on the lower surface of the upper rotating body 104.

[0078] The rotating assembly 301 includes a drive shaft 3012 arranged vertically and mounted on a mounting base, and a motor 3011 for driving the drive shaft 3012 to rotate. A lower rotating body 3013 is provided at the upper end of the drive shaft 3012, and a plurality of lower magnets 3014 are arranged in an array along the circumferential direction on the upper surface of the lower rotating body 3013.

[0079] During the movement of the sprocket chain condition 101 traction clamping assembly 102, the upper rotating body 104 of the clamping assembly 102 can be located directly above the lower rotating body 3013 and the two are close to each other. At this time, the drive shaft 3012 is driven to rotate by the motor 3011. The drive shaft 3012 drives the lower rotating body 3013 to rotate. The magnetic poles of the lower magnet 3014 and the upper magnet 105 are opposite. Under the action of the magnetic attraction force of the two, the upper rotating body 104 follows the lower rotating body 3013 to rotate together, thereby causing the preform sleeved outside the clamping ring 108 to rotate, that is, to realize the rotation of the preform in the heating chamber 300. The rotation is conducive to the uniform heating of various parts of the preform, improving the uniformity of heating, and indirectly improving the quality of subsequent bottle blowing operations.

[0080] Furthermore, the rotating assembly 301 is provided in multiple quantities corresponding to the number of clamping units located in the heating chamber 300.

[0081] Bottle blow molding component 200:

[0082] Reference Figures 8-10 The blown bottle component 200 is located above the sprocket chain condition 101.

[0083] The blow molding component 200 includes a fixed bracket 201, on which a guide rod 206 is provided. The guiding direction of the guide rod 206 is parallel to the axis of the sprocket. A mold unit is provided on the guide rod 206. Two mold units are provided to correspond to the two clamping units of the clamping assembly 102.

[0084] Furthermore, the mold unit includes a side mold that is slidably connected to the guide rod 206. There are two side molds and a spring 209 is provided between the two side molds. Each of the two side molds has a mold groove on the opposite side. When the two side molds are in contact with each other, the two mold grooves together form a mold cavity.

[0085] For ease of description, the two side molds are named side mold one 207 and side mold two 208 respectively, and side mold two 208 of the two mold units is located between side mold one 207 of the two mold units.

[0086] The fixed bracket 201 is also provided with a drive assembly for driving the mold unit to close. Further, the drive assembly includes a lifting bracket 203 and a linear module 202 for driving the lifting bracket 203 to move in the vertical direction. This can be achieved using existing lead screw linear movement technology, which will not be described in detail.

[0087] The bottom of the lifting bracket 203 is provided with a side insert rod 204 and a middle insert rod 205. The side insert rod 204 is located above the side mold 1 207. The bottom of the side insert rod 204 is provided with an upper inclined surface 1, and the top of the side mold 1 207 is provided with a lower inclined surface 1. During the downward movement of the side insert rod 204, the upper inclined surface 1 and the lower inclined surface 1 come into contact and, with their cooperation, can drive the side mold 1 207 closer to the side mold 2 208.

[0088] Similarly, the middle insert rod 205 is located above the second side mold 208. The bottom of the middle insert rod 205 is provided with an upper inclined surface 2, and the top of the second side mold 208 is provided with a lower inclined surface 2. During the downward movement of the middle insert rod 205, the upper inclined surface 2 and the lower inclined surface 2 come into contact and, with their cooperation, can drive the second side mold 208 to approach the first side mold 207.

[0089] Therefore, the downward movement of the lifting bracket 203 can drive the mold unit to close, and when the lifting bracket 203 moves upward, the spring 209 releases its elastic force, and the mold unit opens.

[0090] It should be noted that there are multiple side insert rods 204 corresponding to side mold 1 207, while there are two upper inclined surfaces on the middle insert rod 205, which can simultaneously drive the side mold 2 208 of the two mold units to approach the corresponding side mold 1 207.

[0091] Reference Figure 8 A lifting seat 214 is provided between the two sprocket chain conditions 101, located below the mold unit. When the clamping assembly 102 is located directly below the mold unit, the lifting seat 214 is located below the clamping assembly 102.

[0092] The lifting seat 214 is equipped with blow molding units, and the number of blow molding units corresponds to the number of mold cavities.

[0093] The blow molding unit includes a sliding hole on the lifting seat 214, a blow molding tube 215 is slidably sleeved in the sliding hole, a blow molding head 216 is provided at the upper end of the blow molding tube 215, and a spring 217 is sleeved on the outside of the blow molding tube 215 between the lifting seat 214 and the blow molding head 216. The blow molding tube 215 is coaxial with the mold cavity after mold closing.

[0094] The lifting seat 214 is driven to move by the driving component. Furthermore, the fixed bracket 201 is provided with a vertically arranged rack 210, a gear 212 meshing with the rack 210, and a vertically arranged rack 213 meshing with the gear 212. A spring 211 is provided between the rack 210 and the fixed bracket 201. Its elastic force is used to drive the rack 210 to move upward. The rack 210 and the rack 213 are located on both sides of the gear 212. During the downward movement of the lifting bracket 203, it can push the rack 210 downward.

[0095] Rack 213 is connected to lifting seat 214. When rack 1 210 moves down, it drives rack 213 to move up through gear 212. Rack 213 moves up along with lifting seat 214, and lifting seat 214 moves up along with blow molding unit.

[0096] A compressor is connected to the lower end of the blow-molded tube 215.

[0097] 400 receiving box:

[0098] Reference Figure 1 Below the conveyor line 100 is a receiving box 400, which is used to receive and store blow-molded plastic bottles.

[0099] Preferably, to assist the plastic bottle in smoothly and easily detaching from the clamping unit, refer to Figure 8 An auxiliary seat 401 is provided between the conveyor line 100 and the receiving box 400. A spring 402 is provided between the auxiliary seat 401 and the fixed bracket 201, and its elasticity is used to drive the auxiliary seat 401 to move upward.

[0100] An air blowing unit is provided on the auxiliary seat 401. The structure of the air blowing unit is the same as that of the blow molding unit. The connection relationship between the air blowing unit and the auxiliary seat 401 is the same as that between the blow molding unit and the lifting seat 214.

[0101] A connecting rod 403 is provided on the side of the auxiliary seat 401. The end of the connecting rod 403 is located below the rack 210. When the rack 210 moves down and drives the lifting seat 214 to move up, it will also drive the connecting rod 403, the auxiliary seat 401 and the air blowing unit to move down.

[0102] Working principle of the invention:

[0103] Step 1: Using robotic arms or manual techniques, place the preform onto the outside of the clamping ring 108;

[0104] Step 2: The sprocket chain condition 101 pulls the clamping assembly 102 to move, thereby moving the preform so that the preform is placed in the heating chamber 300 to receive heating;

[0105] Step 3: Continue to pull the clamping assembly 102 and the preform by sprocket chain condition 101, so that the heated preform is located between the two side molds of the mold unit;

[0106] Step 4: The linear module 202 drives the lifting bracket 203 to move down. The lifting bracket 203 moves down together with the side insert rod 204 and the middle insert rod 205. With the cooperation of the lower inclined surface 1 and the upper inclined surface 1, as well as the lower inclined surface 2 and the upper inclined surface 2, the two side molds of the mold unit approach each other and the mold closing action occurs. The preform is located in the mold cavity after the mold is closed.

[0107] At the same time as the mold is closed, the lifting bracket 203 pushes the rack 210 down. When the rack 210 moves down, it drives the rack 213 up through the gear 212. The rack 213 moves up with the lifting seat 214, and the lifting seat 214 moves up with the blow molding unit, so that the blow molding head 216 contacts the lower end of the rotating shaft 106. At this time, the lower opening of the exhaust channel 109 is blocked, and the rotating shaft 106 is connected to the blow molding head 216.

[0108] Step 5: The compressor starts, and air flows into the rotating shaft 106 through the blow molding tube 215 and the blow molding head 216, thereby pushing the piston 117 to move upward. The piston 117 moves upward along with the movable tube 111 and the stretching head 112. The upward movement of the stretching head 112 realizes the axial stretching (i.e., pre-stretching) of the preform.

[0109] When the preform approaches the top of the mold cavity, for example, when the distance between them is 1-2 cm, the annular groove connects with the upper opening of the connecting hole 116. After that, air flows into the preform through the rotating shaft 106, connecting channel 115, connecting hole 116, annular groove, side hole 118, movable tube 111, stretching head 112 and blow molding hole 114 to perform high-pressure blow molding on the preform.

[0110] Step Six: After the preset time, the high-pressure blow molding is completed. Wait for the preset time again to complete the pressure holding, cooling, and shaping process.

[0111] Step 7: The linear module 202 drives the lifting bracket 203 to move upward, thereby opening the mold unit. At the same time, the blow molding unit moves downward and resets, the contact between the blow molding head 216 and the rotating shaft 106 is removed, the lower opening of the exhaust channel 109 is opened, and the high-pressure gas in the plastic bottle is discharged through the exhaust channel 109, thus realizing exhaust and mold opening.

[0112] Step 8: The plastic bottles that have been blown away are pulled by the sprocket chain condition 101. The next batch of preforms that have been heated are located between the two side molds of the mold unit. Then, steps 4-7 are repeated.

[0113] The technical advantage of this case lies in:

[0114] I. This case utilizes a telescopic clamping unit constructed from components such as fixed and movable tubes, which, in conjunction with a blow molding unit, enables the blow molding of bottle preforms. Its technical advantages are:

[0115] Technical effect 1: It can not only achieve axial pre-stretching of heated bottle preforms, but also high-pressure blow molding of bottle preforms, resulting in a more simplified structure;

[0116] Technical Effect 2: In this case, when the stretching head of the movable tube completes the axial pre-stretching of the preform, bringing the preform close to the top of the mold cavity, the blow molding head and the preform can be connected, and high-pressure blow molding of the preform can begin. In other words, there is a seamless connection between axial pre-stretching and high-pressure blow molding, which can solve the problem mentioned in the background technology that "the time interval between pre-stretching and high-pressure blow molding is at the millisecond level, which requires very high precision from the relevant system" and improve the blow molding quality.

[0117] Second, this design utilizes the mold-closing action to bring the blow molding head into contact with the rotating shaft of the clamping unit, thus completing the construction of the blow molding structure. The technical advantages are:

[0118] Technical effect 3: This design utilizes the downward pressure of mold closing to achieve the connection between the blow molding head and the rotating shaft at the same time as mold closing. That is, the air passage of the blow molding structure is also connected at the same time as mold closing, and pre-stretching can be performed immediately, which is highly efficient.

[0119] Technical effect 4: This design utilizes the downward pressure of mold closing to enable the blowing unit to connect with the clamping unit where the blow-molded plastic bottle is located. This allows the plastic bottle to be blown off the clamping unit by airflow, resulting in smoother and more stable unloading without damaging the plastic bottle.

[0120] 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 fully automatic plastic extrusion blow molding machine, comprising a conveyor line (100) and a blow molding component (200) and a heating chamber (300) located above the conveyor line (100), characterized in that, The conveyor line (100) includes a sprocket chain condition (101) and a clamping assembly (102). The sprockets of the sprocket chain condition (101) are arranged horizontally and there are two sprocket chain conditions (101) along the axis of the sprockets. The clamping assembly (102) includes a support (103) disposed between the chains of the two sprocket chain conditions (101) and a clamping unit is disposed on the support (103). The clamping unit includes a mounting hole on the support (103). When the clamping assembly (102) is located on the part of the chain that is arranged horizontally, the axis of the mounting hole is arranged vertically and a rotating shaft (106) is sleeved inside the mounting hole. The rotating shaft (106) is a hollow shaft. A clamping seat (107) is provided at the upper end of the rotating shaft (106). A clamping ring (108) and a fixing tube (110) are provided on the upper surface of the clamping seat (107). The clamping ring (108), the fixing tube (110) and the rotating shaft (106) are coaxial. The fixed tube (110) is located inside the clamping ring (108). The upper opening of the fixed tube (110) is provided with an internal step. The fixed tube (110) is fitted with a piston (117). The upper end face of the piston (117) is provided with a movable tube (111). The upper end of the movable tube (111) passes through the internal step and is provided with a hemispherical stretching head (112). The movable tube (111) and the internal step form a sealed sliding guide fit. The movable tube (111) is fitted with a spring (113) located between the piston (117) and the internal step.

2. The fully automatic plastic extrusion blow molding machine according to claim 1, characterized in that, The lower end face of the fixed tube (110) is provided with a connecting hole (116). The end of the connecting hole (116) extends through the inner wall of the fixed tube (110) and is close to the built-in step. The rotating shaft (106) and the connecting hole (116) are connected through a connecting channel (115). The outer surface of the piston (117) is provided with an annular groove, and a side hole (118) is provided through the bottom of the annular groove. The interior of the stretching head (112) is hollow and connected to the movable tube (111). The outer surface of the stretching head (112) is provided with a blow molding hole (114).

3. The fully automatic plastic extrusion blow molding machine according to claim 2, characterized in that, The lower end face of the rotating shaft (106) is provided with an exhaust channel (109), the end of which extends through to the upper surface of the clamping seat (107) and is located between the fixing tube (110) and the clamping ring (108).

4. The fully automatic plastic extrusion blow molding machine according to claim 3, characterized in that, Multiple clamping assemblies (102) are arranged in an array along the moving direction of the sprocket chain condition (101), and two clamping units are arranged on the support (103) along the axis of the sprocket. The outer circular surface of the clamping ring (108) and the inner circular surface of the preform form an interference fit.

5. The fully automatic plastic extrusion blow molding machine according to claim 3, characterized in that, A mounting base located below the heating chamber (300) is provided in the area between the two sprocket chain conditions (101), and a rotating assembly (301) is provided on the mounting base for driving the preform located in the heating chamber (300) to rotate.

6. The fully automatic plastic extrusion blow molding machine according to claim 5, characterized in that, An upper rotating body (104) is provided on the outside of the lower end of the rotating shaft (106), and multiple upper magnets (105) are arranged in an array along the circumferential direction on the lower surface of the upper rotating body (104). The rotating assembly (301) includes a drive shaft (3012) arranged vertically and mounted on a mounting base, and a motor (3011) for driving the drive shaft (3012) to rotate. A lower rotating body (3013) is provided at the upper end of the drive shaft (3012), and a plurality of lower magnets (3014) are arranged in an array along the circumferential direction on the upper surface of the lower rotating body (3013). During the movement of the sprocket chain condition (101) traction clamping assembly (102), the upper rotating body (104) of the clamping assembly (102) can be located directly above the lower rotating body (3013) and the two are close to each other. Multiple rotating assemblies (301) are provided accordingly.

7. The fully automatic plastic extrusion blow molding machine according to claim 5, characterized in that, The blow molding component (200) includes a fixed bracket (201), a guide rod (206) parallel to the sprocket is provided on the fixed bracket (201), a mold unit is provided on the guide rod (206), the mold unit includes a side mold that is slidably connected to the guide rod (206), there are two side molds and a spring (209) is provided between the two side molds, and a mold groove is provided on the opposite side of the two side molds. When the two side molds are in contact with each other, the two mold grooves together form a mold cavity. The fixed bracket (201) is also provided with a drive assembly for driving the mold unit to close.

8. The fully automatic plastic extrusion blow molding machine according to claim 7, characterized in that, The drive assembly includes a lifting bracket (203) and a linear module (202) for driving the lifting bracket (203) to move in the vertical direction. The bottom of the lifting bracket (203) is provided with a side insert rod (204) and a middle insert rod (205) located above the two side molds respectively. The bottom of the side insert rod (204) is provided with an upper inclined surface 1, the bottom of the middle insert rod (205) is provided with an upper inclined surface 2, the top of one side mold is provided with a lower inclined surface 1, and the top of the other side mold is provided with a lower inclined surface 2. During the downward movement of the side insert rod (204) and the middle insert rod (205), the upper inclined surface 1 contacts the lower inclined surface 1 and the upper inclined surface 2 contacts the lower inclined surface 2. With the cooperation of the four, the two side molds can be driven to move closer to each other.

9. A fully automatic plastic extrusion blow molding machine according to claim 8, characterized in that, A lifting seat (214) is provided between the two sprocket chain conditions (101) and located below the mold unit. When the clamping assembly (102) is located directly below the mold unit, the lifting seat (214) is located below the clamping assembly (102). A blow molding unit is provided on the lifting seat (214), and multiple blow molding units are provided corresponding to the number of mold cavities. The blow molding unit includes a sliding hole on the lifting seat (214), a blow molding tube (215) is slidably sleeved in the sliding hole, a blow molding head (216) is provided at the upper end of the blow molding tube (215), and a spring four (217) is sleeved on the outside of the blow molding tube (215) between the lifting seat (214) and the blow molding head (216). The blow molding tube (215) is coaxial with the mold cavity after mold closing. The fixed bracket (201) is provided with a vertically arranged rack 1 (210), a gear (212) meshing with rack 1 (210), and a vertically arranged rack 2 (213) meshing with gear (212). A spring 3 (211) is provided between rack 1 (210) and the fixed bracket (201) to elastically drive rack 1 (210) to move upward. Rack 1 (210) and rack 2 (213) are located on both sides of gear (212). During the downward movement of the lifting bracket (203), rack 1 (210) can be pushed downward. The second rack (213) is connected to the lifting seat (214).

10. The working method of a fully automatic plastic extrusion blow molding machine as described in claim 9, characterized in that, Includes the following steps: Step 1: Place the preform onto the outside of the clamping ring (108); Step 2: The sprocket chain condition (101) pulls the clamping assembly (102) and the preform to move, so that the preform is placed in the heating chamber (300) to be heated; Step 3: Continue to pull the clamping assembly (102) and the preform by using the sprocket chain condition (101) to move the preform so that the heated preform is located between the two side molds of the mold unit; Step 4: The linear module (202) drives the lifting bracket (203) to move down. The lifting bracket (203) moves down together with the side insert rod (204) and the middle insert rod (205). With the cooperation of the lower inclined surface 1 and the upper inclined surface 1, as well as the lower inclined surface 2 and the upper inclined surface 2, the two side molds of the mold unit approach each other and the mold closing action occurs. The preform is located in the mold cavity after the mold is closed. At the same time as the mold is closed, the lifting bracket (203) pushes the rack one (210) down. When the rack one (210) moves down, it drives the rack two (213) up through the gear (212). The rack two (213) moves up together with the lifting seat (214). The lifting seat (214) moves up together with the blow molding unit, so that the blow molding head (216) abuts against the lower end of the rotating shaft (106). At this time, the lower opening of the exhaust channel (109) is blocked, and the rotating shaft (106) is connected to the blow molding head (216). Step 5: The compressor starts, and air flows into the rotating shaft (106) through the blow molding tube (215) and blow molding head (216), thereby pushing the piston (117) upward. The piston (117) moves the movable tube (111) and the stretching head (112) upward together. The upward movement of the stretching head (112) realizes the axial stretching of the preform. When the preform approaches the top of the mold cavity, the annular groove connects with the upper opening of the connecting hole (116). Subsequently, air flows into the preform through the rotating shaft (106), connecting channel (115), connecting hole (116), annular groove, side hole (118), movable tube (111), stretching head (112) and blow molding hole (114) to perform high-pressure blow molding on the preform. Step Six: After the preset time, the high-pressure blow molding is completed. Wait for the preset time again to complete the pressure holding, cooling, and shaping process. Step 7: The linear module (202) drives the lifting bracket (203) to move upward, thereby opening the mold unit. At the same time, the blow molding unit moves downward and resets, the contact between the blow molding head (216) and the rotating shaft (106) is removed, the lower opening of the exhaust channel (109) is opened, and the high-pressure gas in the plastic bottle is discharged through the exhaust channel (109). Step 8: After the plastic bottles are blown away by the sprocket chain condition (101), the next batch of preforms that have been heated are located between the two side molds of the mold unit. Then, steps 4-7 are repeated.

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