A bottle blank feeding mechanism for plastic bottle production and a working method thereof

Abstract

The present application relates to the technical field of plastic bottle production, and particularly relates to a bottle blank loading mechanism for plastic bottle production and a working method thereof, which comprises: a storage shell mounted on the ground through supporting legs; a fixed frame arranged on the ground and having two transmission rollers rotatably arranged thereon, a conveying belt arranged between the two transmission rollers, and a plurality of baffles fixedly connected to the conveying belt; an air suction pump fixedly connected to the fixed frame, and having a first conduit fixedly connected to an air inlet end of the air suction pump; a gas guide shell fixedly connected to the fixed frame, in communication with the first conduit, and in abutment with an inner surface of the conveying belt, and a plurality of air holes being formed in the conveying belt. Through the mechanical scraping and pushing action of the baffles on the conveying belt, and the negative pressure adsorption action of the air suction pump through the gas guide shell and the air holes of the conveying belt, the bottle blank can be kept stable during the conveying process, and the situation of the bottle blank slipping off when being lifted along the conveying belt can be reduced.

Description

Technical Field

[0001] This invention relates to the field of plastic bottle production technology, and in particular to a preform feeding mechanism and its working method for plastic bottle production. Background Technology

[0002] In the production and processing of plastic bottles, preforms need to be transported one by one to the next process in an orderly manner. Currently, the common preform feeding mechanism usually uses a combination of belt conveyor and sorting machine. The belt conveyor transports the preforms to the sorting machine step by step, and then the sorting machine sorts the preforms and transports them to the subsequent processing stage.

[0003] However, existing belt conveyors commonly suffer from the problem of bottle preforms easily falling off during the lifting and conveying process. Specifically, since bottle preforms are mostly cylindrical thin-walled structures with relatively smooth surfaces, the friction between them and the conveyor belt is limited. When the conveyor belt lifts the bottle preforms at a certain angle, the stability of the bottle preforms decreases significantly due to unavoidable mechanical vibrations during equipment operation, vibrations generated by motor operation, and fluctuations in the conveyor belt itself. They are prone to rolling, shifting, or even falling directly off the conveyor belt. This falling preforms create gaps on the conveyor belt, causing material shortages at subsequent material handling and processing stations, severely impacting conveying efficiency and the continuous and stable operation of the entire production line. Summary of the Invention

[0004] In order to overcome the problems mentioned in the background art, the present invention provides a preform feeding mechanism and its working method for plastic bottle production.

[0005] The technical solution of this invention is: a preform feeding mechanism for plastic bottle production, comprising:

[0006] The storage tank is mounted on the ground via outriggers;

[0007] A fixed frame is set on the ground, and two drive rollers are rotatably mounted on it. A conveyor belt is wound between the two drive rollers, and multiple baffles are fixedly connected to the conveyor belt.

[0008] The motor is fixedly connected to the fixed frame, and the output shaft of the motor is fixedly connected to the adjacent transmission roller;

[0009] The material guide shell is mounted on the ground by support legs. The conveyor belt is used to transport the preforms in the storage shell to the material guide shell. Two guide plates are fixed to the lower part of the material guide shell. The two guide plates are used to guide the preforms to move one by one.

[0010] An air pump is fixedly connected to the fixed frame, and the air inlet end of the air pump is fixedly connected to a first conduit.

[0011] A gas guide shell is fixed to the fixed frame. The first conduit is connected to the gas guide shell. The gas guide shell is in contact with the inner surface of the conveyor belt. The conveyor belt has multiple vent holes for the preform to adhere to the surface of the conveyor belt.

[0012] More preferably, a plurality of rotating rollers are rotatably arranged on the air guide shell, the rotating rollers are in contact with the inner surface of the conveyor belt, the exhaust end of the air pump is fixedly connected to a second conduit, the material guide shell is fixedly connected to a first jet pipe communicating with the second conduit, the first jet pipe is used to spray air into the material guide shell, the first jet pipe is connected to a second jet pipe, and the second jet pipe is located between the two guide plates.

[0013] More preferably, it also includes a detection unit disposed on the feed guide shell, the detection unit being used to perform breakage detection on the preform, the detection unit comprising:

[0014] A support frame is fixed to the material guide shell, and a sliding groove is provided on it;

[0015] An electric slider is slidably disposed within a groove in the support frame;

[0016] A rotating tube is rotatably mounted on the electric slider, and the electric slider has a gas channel communicating with the rotating tube. A spline is provided at the lower part of the rotating tube.

[0017] A sliding plug is slidably disposed at the spline of the rotating tube, and the sliding plug has an exhaust port. The sliding plug is used to seal the mouth of the preform.

[0018] The second electric push rod is fixed to the support frame. The telescopic end of the second electric push rod penetrates the support frame and is slidably connected to it. The telescopic end of the second electric push rod is rotatably connected to the sliding plug.

[0019] A constant pressure air pump is fixed to the support frame. A hose is installed at the exhaust port of the constant pressure air pump. An air supply valve is installed on the hose. The other end of the hose is connected to the gas channel on the electric slider. A pressure sensor for detecting the gas pressure inside the gas channel on the electric slider is installed.

[0020] A limiting component is disposed on one of the guide plates, the limiting component being used to control the preforms to be detected one by one.

[0021] More preferably, the limiting component includes:

[0022] A fixing plate is fixedly attached to one of the guide plates;

[0023] The first sliding column is slidably disposed on the fixed plate;

[0024] A first electric push rod is fixedly connected to one of the guide plates, and the telescopic end of the first electric push rod is fixedly connected to the first sliding column.

[0025] More preferably, the rotating tube is fixedly connected to a first gear, and the support frame is fixedly connected to a first rack, with the first gear meshing with the first rack.

[0026] More preferably, the fixed plate is slidably provided with a second sliding column, and both the first sliding column and the second sliding column are fixedly connected to a second rack. The fixed plate is rotatably provided with a second gear, and the second gear meshes with two second racks.

[0027] More preferably, each of the two guide plates is fixedly connected to a plurality of support plates, the support plates are slidably provided with a sliding frame, the sliding frame is fixedly connected to the support plate with a tension spring, and the sliding frame is rotatably provided with a rotating wheel, the rotating wheel being used to squeeze the preform.

[0028] More preferably, the rollers connected to the two guide plates are symmetrical in pairs, and the rollers connected to the same guide plate are installed at different distances from the guide plate, so as to squeeze different positions of the preform.

[0029] The present invention also provides a method for operating a preform feeding mechanism for plastic bottle production, comprising the following steps:

[0030] S1: Place the preform into the storage shell, so that the preform falls onto the surface of the conveyor belt; start the motor to drive the transmission roller to rotate, drive the conveyor belt to rotate, and make the baffle scrape and push the preform; start the air pump to draw air from the air guide shell to form a negative pressure. There is a rotating roller between the air guide shell and the inner surface of the conveyor belt. The negative pressure adsorbs the preform through the air vents on the conveyor belt and lifts the preform along the conveyor belt.

[0031] S2: When the preform moves to the top unloading end with the conveyor belt, the preform detaches from the conveyor belt and falls into the guide shell; the exhaust pump is vented through the second conduit to the first jet pipe, and the first jet pipe sprays air into the guide shell to push the preform downward and into the space between the two guide plates; the second jet pipe, which is connected to the first jet pipe, blows air along the direction of the preform's movement to push the preform forward along the guide plate.

[0032] S3: When the preform moves along the guide plate to the inspection station, the limiting component limits each preform individually, allowing each preform to enter the inspection position; the first electric push rod is activated, driving the first sliding column to slide, the first sliding column drives the second gear to rotate through the second rack, the second gear drives the second rack and the second sliding column on the other side to slide in the opposite direction, the first sliding column and the second sliding column move relative to each other to clamp and limit the preform, and move in opposite directions to release the preform; the second electric push rod is activated, driving the sliding plug to move along the rotating tube to insert into the bottle mouth and seal it;

[0033] S4: The limit component releases the current preform. The constant pressure air pump supplies air to the preform through the hose, the gas channel inside the electric slider, the rotating tube and the sliding plug, so that the pressure inside the preform increases. After the pressure sensor detects that the air has been filled to the set pressure, the air supply valve is closed to maintain the pressure. The pressure sensor monitors the pressure change. If the pressure drops, it is determined that the preform is damaged.

[0034] S5: During the pressure holding test, the electric slider is started and slides down along the support frame. The bottle preform is moved down through the rotating tube and the sliding plug. At the same time, the first gear on the rotating tube meshes with the first rack on the support frame, driving the rotating tube and the bottle preform to rotate. During the movement and rotation of the bottle preform, the symmetrically arranged rotating wheels on the guide plate elastically press the side wall of the bottle preform under the action of the tension spring.

[0035] The beneficial effects are:

[0036] 1. This invention utilizes the mechanical scraping and pushing action of the baffles on the conveyor belt, combined with the negative pressure adsorption effect generated by the air pump through the air guide shell and the air vents of the conveyor belt, to keep the preform stable during the conveying process and reduce the possibility of the preform slipping when it is lifted along the conveyor belt.

[0037] 2. Gas is sent to the first jet pipe through the exhaust end of the air pump via the second conduit. The airflow is then ejected into the material shell through the first jet pipe, which helps to accelerate the downward movement of the preform and its entry into the space between the two guide plates. At the same time, the airflow can provide some cushioning for the falling preform, which helps to reduce impact damage during the fall. Gas is blown along the direction of preform movement through the second jet pipe, which helps to push the preform forward in an orderly manner under the constraint of the guide plates.

[0038] 3. The sliding plug is driven by the second electric push rod to move along the rotating tube and insert into the bottle mouth of the preform for sealing. In conjunction with the constant pressure air pump, air is supplied to the inside of the preform and pressure is maintained. The pressure sensor monitors the pressure change in real time. It can determine whether there is any damage or defect in the preform based on whether the pressure drops during the pressure maintenance period.

[0039] 4. The electric slider moves down and rotates the bottle preform through the meshing of the first gear and the first rack. The rotating wheels, which are symmetrically arranged on the guide plate, are elastically pressed against different heights of the bottle preform sidewall under the action of the tension spring. This can apply compression and limiting to different parts of the bottle preform, which helps to keep the bottle preform's posture stable during rotation. At the same time, the compression and internal air pressure work together to facilitate the stress concentration at the defect location, which helps to improve the accuracy of damage detection. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0041] Figure 2 This is a cross-sectional view of the fixing frame and conveyor belt of the present invention.

[0042] Figure 3 This is a three-dimensional structural diagram of the air pump and the first jet pipe of the present invention.

[0043] Figure 4 This is a three-dimensional structural diagram of the fixing plate and the electric slider of the present invention.

[0044] Figure 5 This is a three-dimensional structural diagram of the first electric push rod and sliding frame of the present invention.

[0045] Figure 6 This is a cross-sectional view of the support frame and electric slider of the present invention.

[0046] Figure 7 This is a cross-sectional view of the rotating tube and sliding plug of the present invention.

[0047] In the attached drawings, the following are the reference numerals: 1-storage shell, 2-fixed frame, 3-drive roller, 4-conveyor belt, 5-baffle, 6-motor, 7-guide shell, 8-guide plate, 9-air pump, 10-first guide tube, 11-air guide shell, 12-rotating roller, 13-second guide tube, 14-first air jet pipe, 15-second air jet pipe, 16-fixed plate, 17-first sliding column, 18-first electric push rod, 19-support frame, 20-electric slider, 21-rotating tube, 22-sliding plug, 23-second electric push rod, 24-constant pressure air pump, 25-hose, 26-pressure sensor, 27-first gear, 28-first rack, 29-second sliding column, 30-second rack, 31-second gear, 32-support plate, 33-sliding frame, 34-rotating wheel. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] A preform feeding mechanism for plastic bottle production, such as Figure 1 and Figure 2As shown, its structure is as follows: a storage shell 1, supported on the ground by legs; a fixed frame 2, situated on the ground, with two drive rollers 3 rotatably connected thereto, a conveyor belt 4 tensioned between the two drive rollers 3, and multiple baffles 5 fixed on the conveyor belt 4; a motor 6, mounted on the fixed frame 2, its output shaft fixedly connected to the adjacent drive roller 3, and a control terminal electrically connected to all electrical components on the fixed frame 2; and a guide shell 7, standing on the ground by legs, with the conveyor belt 4 responsible for feeding the preforms from the storage shell 1 into the guide shell 7, the lower end of which is fixedly mounted. There are two guide plates 8, the gap between the two guide plates 8 is slightly larger than the diameter of the preform, the guide plates 8 are inclined, and the two guide plates 8 guide the preforms to move downward one by one in an orderly manner; the vacuum pump 9 is fixedly connected to the fixed frame 2, and its air inlet end is connected to the first conduit 10; the air guide shell 11 is fixedly connected to the fixed frame 2, the first conduit 10 communicates with the interior of the air guide shell 11, the air guide shell 11 is tightly attached to the inner surface of the conveyor belt 4, and the conveyor belt 4 has multiple vent holes distributed on it to make the preforms firmly adhere to the surface of the conveyor belt 4.

[0051] like Figure 2 and Figure 3 As shown, multiple equidistant rotating rollers 12 are rotatably arranged on the air guide shell 11. The rotating rollers 12 are in contact with the inner surface of the conveyor belt 4, providing smooth support for the conveyor belt 4. The exhaust end of the vacuum pump 9 is connected to a second conduit 13. A first jet pipe 14 is fixedly connected to the material guide shell 7. The first jet pipe 14 is used to spray air into the material guide shell 7, so that a buffered preform airflow is formed inside the material guide shell 7. The first jet pipe 14 is connected to the second conduit 13. The first jet pipe 14 is used to spray airflow into the material guide shell 7. The first jet pipe 14 is also connected to a second jet pipe 15. The second jet pipe 15 extends between the two guide plates 8 to assist in the arrangement of preforms.

[0052] Specific working principle:

[0053] During operation, the preforms to be conveyed are first placed into the storage shell 1. The preforms in the storage shell 1 fall onto the surface of the conveyor belt 4 under the action of gravity. The motor 6 is started, and the output shaft of the motor 6 drives the transmission roller 3 fixed to it to rotate, thereby driving the conveyor belt 4 to circulate between the two transmission rollers 3. Multiple baffles 5 fixed on the conveyor belt 4 move together with the conveyor belt 4, scraping and pushing the preforms accumulated on the surface of the conveyor belt 4, and pushing the preforms to move along the conveying direction.

[0054] At the same time, the vacuum pump 9 is started. The air inlet of the vacuum pump 9 draws air into the air guide shell 11 through the first conduit 10, creating a negative pressure inside the air guide shell 11. Since the air guide shell 11 is in contact with the inner surface of the conveyor belt 4, and the conveyor belt 4 has multiple vent holes, the negative pressure acts on the bottle preform on the surface of the conveyor belt 4 through the vent holes, firmly adsorbing the bottle preform onto the surface of the conveyor belt 4. The multiple rotating rollers 12 rotatably mounted on the air guide shell 11 rotate with the operation of the conveyor belt 4, ensuring that the air guide shell 11 and the inner surface of the conveyor belt 4 are in contact and sealed, while reducing the frictional resistance between the two. Under the combined action of the mechanical pushing of the baffle 5 and the negative pressure adsorption of the vent holes, the bottle preform is stably lifted upward along the conveyor belt 4, effectively avoiding the problem of the bottle preform falling during the conveying process.

[0055] When the preform moves to the top unloading end with the conveyor belt 4, the suction area of ​​the air guide shell 11 is only set in the middle and lower lifting section, and the suction is automatically disconnected at the top turning point. At this time, the preform is separated from the conveyor belt 4 under the action of gravity and inertia and falls into the guide shell 7. The gas discharged from the exhaust end of the air pump 9 is transported to the first jet pipe 14 through the second conduit 13. The first jet pipe 14 sprays air into the guide shell 7 to help push the preform falling into the guide shell 7 to move downward, speed up the speed of the preform entering between the two guide plates 8, and prevent the preform from getting stuck in the guide shell 7. At the same time, the air wall sprayed by the first jet pipe 14 can buffer the falling preform and reduce the damage to the preform.

[0056] The preforms fall between the two guide plates 8 and are arranged in a single row under the constraint of the guide plates 8. At the same time, the second jet pipe 15, which is connected to the first jet pipe 14, is located between the two guide plates 8. The airflow it sprays blows along the direction of movement of the preforms, further pushing the preforms forward one by one in an orderly manner along the guide plates 8.

[0057] Example 2

[0058] Based on Example 1, such as Figures 3-7As shown, the mechanism also includes a detection unit mounted on the guide shell 7 for detecting breakage of the preform. The detection unit includes: a support frame 19, fixedly connected to the guide shell 7, with a groove on the support frame 19; an electric slider 20, slidably mounted in the groove of the support frame 19; a rotating tube 21, rotatably connected to the lower part of the electric slider 20, with a gas channel communicating with the rotating tube 21 inside the electric slider 20, and a spline machined on the lower part of the rotating tube 21; and a sliding plug 22, slidably mounted on the splined portion of the rotating tube 21, with an exhaust port on the sliding plug 22, used to seal the bottle neck of the preform. The vent on the plug 22 is used to inject gas into the preform; the second electric push rod 23 is fixed to the upper surface of the support frame 19, its telescopic end passes through the support frame 19 and slides with it, and the telescopic end forms a rotatable connection with the sliding plug 22; the constant pressure air pump 24 is installed on the upper surface of the support frame 19, its vent is connected to a hose 25, a gas supply valve is installed on the hose 25, and the other end of the hose 25 is connected to the gas channel on the electric slider 20, and a pressure sensor 26 for detecting air pressure is provided in the gas channel on the electric slider 20; the limiting component is arranged on one of the guide plates 8 to control the preforms to be tested one by one.

[0059] like Figure 4 and Figure 5 As shown, the limiting component includes: a fixed plate 16, fixedly connected to one of the guide plates 8; a first sliding column 17, slidably disposed on the fixed plate 16; a first electric push rod 18, installed on the guide plate 8 fixedly connected to the fixed plate 16, with its telescopic end fixedly connected to the first sliding column 17, and the limiting control is achieved by driving the first sliding column 17; a second sliding column 29 is slidably mounted on the fixed plate 16; a second rack 30 is fixed on both the first sliding column 17 and the second sliding column 29; a second gear 31 is rotatably disposed on the fixed plate 16; the second gear 31 meshes with both second racks 30 simultaneously to form synchronous linkage and control the bottle preform to move sequentially.

[0060] like Figure 5 and Figure 6 As shown, a first gear 27 is fixedly connected to the rotating tube 21, and a first rack 28 is fixedly mounted on the support frame 19. The first gear 27 meshes with the first rack 28, so that the rotating tube 21 rotates when it is raised and lowered. Multiple support plates 32 are fixed on each of the two guide plates 8. A sliding frame 33 is slidably mounted on the support plate 32. The sliding frame 33 is elastically connected to the support plate 32 by a tension spring. A rotating wheel 34 is rotatably mounted on the sliding frame 33. The rotating wheel 34 squeezes the bottle preform. The rotating wheels 34 on the two guide plates 8 are arranged symmetrically in pairs, and the installation distance of each rotating wheel 34 mounted on the same guide plate 8 relative to the guide plate 8 is different, so as to squeeze different parts of the bottle preform and improve the comprehensiveness of the inspection.

[0061] Specific working principle:

[0062] Based on the completion of single-row arrangement of the preforms and their movement along the guide plate 8, the present invention further provides a detection unit for detecting the breakage of the preforms. When the preforms move to the detection station along the two guide plates 8, the movement of the preforms is controlled by the limiting component, so that the preforms are detected one by one. When the limiting component is working, the telescopic end of the first electric push rod 18 extends or retracts, driving the first sliding column 17 fixed thereto to slide along the fixed plate 16. When the first sliding column 17 slides, it drives the second gear 31 to rotate through the second rack 30 fixed thereto. The second gear 31 then drives the second rack 30 and the second sliding column 29 on the other side to slide synchronously in opposite directions. The relative or opposite movement of the first sliding column 17 and the second sliding column 29 realizes the clamping and limiting or release of the preforms, ensuring that only one preform enters the detection position at a time.

[0063] When a single preform reaches the detection position, the sliding plug 22 is positioned above the preform to be tested. The second electric push rod 23 operates, causing the sliding plug 22 to move along the rotating tube 21. The sliding plug 22 gradually inserts into the bottle opening of the preform. When the second electric push rod 23 stops operating, the sliding plug 22 maintains its seal on the bottle opening of the preform. Simultaneously, the exhaust port on the sliding plug 22 communicates with the internal cavity of the preform. The subsequent limiting component releases the limit on the preform to be tested. At the same time, the constant pressure air pump 24 supplies air to the gas channel of the electric slider 20 through the hose 25. The air enters the interior of the preform through the exhaust port on the sliding plug 22, causing the pressure inside the preform to gradually increase. When the pressure sensor 26 detects that the air has been filled to the set pressure, the air supply valve is then closed to maintain the pressure. The pressure sensor 26 monitors the gas pressure in the gas channel in real time. If the preform is intact, the pressure remains constant; if the preform has cracks or is damaged, the pressure drops. This is used to determine whether the preform has any defects.

[0064] During the testing process, the electric slider 20 slides downward along the groove of the support frame 19. The electric slider 20 moves together with the preform to be tested via the rotating tube 21, the sliding plug 22, and the rotating tube 20. During this process, the first gear 27 fixed on the rotating tube 21 meshes with the first rack 28 fixed on the support frame 19, causing the rotating tube 21 to rotate as it descends. This causes the preform squeezed by the sliding plug 22 to rotate as well. During the movement and testing of the preform along the guide plate 8, the rotating wheels 34 on the guide plate 8, which are rotatably mounted via the support plate 32 and the sliding frame 33, are elastically pressed against the side wall of the preform under the tension of the tension spring. The installation distances of the rotating wheels 34 connected to the same guide plate 8 are different. The rotating wheels 34 on the two guide plates 8 are symmetrically arranged in pairs, which can squeeze and limit different positions of the preform, avoid the presence of tiny cracks on the preform, and improve the accuracy of the test results.

[0065] Example 3

[0066] Based on Example 2, such as Figures 1-7 As shown, the present invention also provides a method for operating a preform feeding mechanism for plastic bottle production, comprising the following steps:

[0067] S1: Place the preform into the storage shell 1 so that the preform falls onto the surface of the conveyor belt 4; start the motor 6 to drive the transmission roller 3 to rotate, which drives the conveyor belt 4 to rotate, so that the baffle 5 scrapes and pushes the preform; start the air pump 9 to draw air from the air guide shell 11 to form a negative pressure. There is a rotating roller 12 between the air guide shell 11 and the inner surface of the conveyor belt 4. The negative pressure adsorbs the preform through the air vents on the conveyor belt 4 and lifts the preform along the conveyor belt 4.

[0068] S2: When the preform moves to the top unloading end with the conveyor belt 4, the preform detaches from the conveyor belt 4 and falls into the guide shell 7; the exhaust pump 9 exhausts air through the second conduit 13 and sends it to the first jet pipe 14, and the first jet pipe 14 sprays air into the guide shell 7, pushing the preform downward and into the space between the two guide plates 8; the second jet pipe 15, which is connected to the first jet pipe 14, blows air along the direction of preform movement, pushing the preform forward along the guide plate 8.

[0069] S3: When the preform moves along the guide plate 8 to the detection station, the limiting component limits each preform individually, allowing each preform to enter the detection position; the first electric push rod 18 is activated, driving the first sliding column 17 to slide. The first sliding column 17 drives the second gear 31 to rotate through the second rack 30. The second gear 31 drives the second rack 30 and the second sliding column 29 on the other side to slide in the opposite direction. The first sliding column 17 and the second sliding column 29 move relative to each other to clamp and limit the preform, and move in opposite directions to release the preform; the second electric push rod 23 is activated, driving the sliding plug 22 to move along the rotating tube 21 to insert into the bottle mouth and seal it;

[0070] S4: The limiting component releases the current preform. The constant pressure air pump 24 supplies air to the preform through the hose 25, the gas channel inside the electric slider 20, the rotating tube 21 and the sliding plug 22, so that the pressure inside the preform increases. After the pressure sensor 26 detects that the air has been filled to the set pressure, the air supply valve is closed to maintain the pressure. The pressure sensor 26 monitors the pressure change. If the pressure drops, it is determined that the preform is damaged.

[0071] S5: During the pressure holding test, the electric slider 20 is started to slide downward along the support frame 19, and the bottle preform is moved down through the rotating tube 21 and the sliding plug 22. At the same time, the first gear 27 on the rotating tube 21 meshes with the first rack 28 on the support frame 19, driving the rotating tube 21 and the bottle preform to rotate. During the movement and rotation of the bottle preform, the symmetrically arranged rotating wheels 34 on the guide plate 8 elastically press the side wall of the bottle preform under the action of the tension spring.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A preform feeding mechanism for plastic bottle production, characterized in that, include: The storage shell (1) is mounted on the ground via support legs; A fixed frame (2) is set on the ground, and two drive rollers (3) are rotatably mounted on it. A conveyor belt (4) is wound between the two drive rollers (3), and multiple baffles (5) are fixed on the conveyor belt (4). The motor (6) is fixedly connected to the fixed frame (2), and the output shaft of the motor (6) is fixedly connected to the adjacent transmission roller (3); The guide shell (7) is installed on the ground by the support legs. The conveyor belt (4) is used to transport the preforms in the storage shell (1) to the guide shell (7). Two guide plates (8) are fixed to the lower part of the guide shell (7). The two guide plates (8) are used to guide the preforms to move one by one. An air pump (9) is fixedly connected to the fixed frame (2). The air inlet end of the air pump (9) is fixedly connected to a first conduit (10), and the exhaust end of the air pump (9) is fixedly connected to a second conduit (13). The material guide shell (7) is fixedly connected to a first jet pipe (14) that communicates with the second conduit (13). The first jet pipe (14) is used to spray air into the material guide shell (7). The first jet pipe (14) is connected to a second jet pipe (15), and the second jet pipe (15) is located between the two guide plates (8). The air guide shell (11) is fixed to the fixed frame (2). The first conduit (10) is connected to the air guide shell (11). The air guide shell (11) is attached to the inner surface of the conveyor belt (4). The conveyor belt (4) has multiple air holes for the preform to be attached to the surface of the conveyor belt (4).

2. The preform feeding mechanism for plastic bottle production according to claim 1, characterized in that, Multiple rotating rollers (12) are rotatably arranged on the air guide shell (11), and the rotating rollers (12) are in contact with the inner surface of the conveyor belt (4).

3. A preform feeding mechanism for plastic bottle production according to claim 2, characterized in that, It also includes a detection unit, which is disposed on the feed guide shell (7). The detection unit is used to perform breakage detection on the preform. The detection unit includes: The support frame (19) is fixed to the guide shell (7) and has a sliding groove thereon; An electric slider (20) is slidably disposed in the groove of the support frame (19); A rotating tube (21) is rotatably mounted on the electric slider (20). The electric slider (20) has a gas channel communicating with the rotating tube (21). The lower part of the rotating tube (21) is provided with a spline. A sliding plug (22) is slidably disposed at the spline of the rotating tube (21). The sliding plug (22) has an exhaust port and is used to seal the mouth of the preform. The second electric push rod (23) is fixed to the support frame (19). The telescopic end of the second electric push rod (23) penetrates the support frame (19) and is slidably connected to it. The telescopic end of the second electric push rod (23) is rotatably connected to the sliding plug (22). A constant pressure air pump (24) is fixed to the support frame (19). A hose (25) is installed at the exhaust port of the constant pressure air pump (24). An air supply valve is installed on the hose (25). The other end of the hose (25) is connected to the gas channel on the electric slider (20). A pressure sensor (26) for detecting the gas pressure inside the gas channel on the electric slider (20) is installed. A limiting component is disposed on one of the guide plates (8), the limiting component being used to control the preforms to be inspected one by one.

4. A preform feeding mechanism for plastic bottle production according to claim 3, characterized in that, The limiting component includes: A fixing plate (16) is fixedly attached to one of the guide plates (8); The first sliding column (17) is slidably disposed on the fixed plate (16); The first electric push rod (18) is fixedly connected to one of the guide plates (8), and the telescopic end of the first electric push rod (18) is fixedly connected to the first sliding column (17).

5. A preform feeding mechanism for plastic bottle production according to claim 4, characterized in that, The rotating tube (21) is fixedly connected to a first gear (27), and the support frame (19) is fixedly connected to a first rack (28). The first gear (27) meshes with the first rack (28).

6. A preform feeding mechanism for plastic bottle production according to claim 5, characterized in that, The fixed plate (16) is slidably provided with a second sliding column (29), and the first sliding column (17) and the second sliding column (29) are both fixedly connected with a second rack (30). The fixed plate (16) is rotatably provided with a second gear (31), and the second gear (31) meshes with the two second racks (30).

7. A preform feeding mechanism for plastic bottle production according to claim 6, characterized in that, Both guide plates (8) are fixedly connected to multiple support plates (32). The support plates (32) are slidably provided with sliding frames (33). A tension spring is fixed between the sliding frames (33) and the support plates (32). The sliding frames (33) are rotatably provided with a rotating wheel (34). The rotating wheel (34) is used to squeeze the preform.

8. A preform feeding mechanism for plastic bottle production according to claim 7, characterized in that, The two guide plates (8) are connected to symmetrically, and the guide plates (8) are connected to the same guide plate (8) at different installation distances, which are used to squeeze the preform at different positions.

9. A method for operating a preform feeding mechanism for plastic bottle production, employing the preform feeding mechanism for plastic bottle production according to claim 8, comprising the following steps: S1: Place the preform into the storage shell (1) so that the preform falls onto the surface of the conveyor belt (4); start the motor (6) to drive the transmission roller (3) to rotate, drive the conveyor belt (4) to run, and make the baffle (5) scrape and push the preform; start the vacuum pump (9) to draw air from the air guide shell (11) to form a negative pressure. There is a rotating roller (12) between the air guide shell (11) and the inner surface of the conveyor belt (4). The negative pressure adsorbs the preform through the air vents on the conveyor belt (4) and lifts the preform along the conveyor belt (4); S2: When the preform moves to the top unloading end with the conveyor belt (4), the preform leaves the conveyor belt (4) and falls into the guide shell (7); the exhaust pump (9) is vented through the second conduit (13) and sent to the first jet pipe (14), and the first jet pipe (14) sprays air into the guide shell (7), pushing the preform downward and into the space between the two guide plates (8); the second jet pipe (15) connected to the first jet pipe (14) blows air along the direction of the preform's movement, pushing the preform forward along the guide plate (8); S3: When the preform moves along the guide plate (8) to the detection station, the limiting component limits the preform one by one, so that a single preform enters the detection position; the first electric push rod (18) is activated, driving the first sliding column (17) to slide. The first sliding column (17) drives the second gear (31) to rotate through the second rack (30). The second gear (31) drives the second rack (30) and the second sliding column (29) on the other side to slide in the opposite direction. The first sliding column (17) and the second sliding column (29) move relative to each other to clamp and limit the preform, and move in opposite directions to release the preform; the second electric push rod (23) is activated, driving the sliding plug (22) to move along the rotating tube (21) to insert into the bottle mouth and seal it; S4: The limiting component releases the current preform. The constant pressure air pump (24) supplies air to the inside of the preform through the hose (25), the gas channel inside the electric slider (20), the rotating tube (21), and the sliding plug (22), so that the pressure inside the preform increases. The pressure sensor (26) detects that the air is filled to the set pressure and then closes the air supply valve to maintain the pressure. The pressure sensor (26) monitors the pressure change. If the pressure drops, it is determined that the preform is damaged. S5: During the pressure test, the electric slider (20) is started to slide down along the support frame (19), and the bottle preform is moved down through the rotating tube (21) and the sliding plug (22). At the same time, the first gear (27) on the rotating tube (21) meshes with the first rack (28) on the support frame (19), driving the rotating tube (21) and the bottle preform to rotate. During the movement and rotation of the bottle preform, the rotating wheels (34) symmetrically arranged on the guide plate (8) elastically press the side wall of the bottle preform under the action of the tension spring.

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