Plastic bag film detection platform

Abstract

The utility model discloses a plastic bag film detection platform which comprises a rack, a control circuit board and edge detection mechanisms, the two edge detection mechanisms are symmetrically arranged at the two ends of the rack, and each edge detection mechanism comprises a first ultrasonic sensor and a guide driving assembly; the conveying roller set is used for guiding and conveying a plastic bag film, the conveying roller set comprises an upper roller shaft and a lower roller shaft which are arranged in parallel, the upper roller shaft is supported above the rack through shaft end supports at the two ends, and the lower roller shaft is supported below the rack through shaft end supports at the two ends; the plastic bag film is vertically downward after rotating from the upper roller shaft and then is conveyed forwards at the lower roller shaft, and an opening of the first ultrasonic sensor is inserted into the edge of the vertical section of the plastic bag film. According to the plastic bag film detection platform disclosed by the utility model, the plastic bag film is conveyed and guided through the integrated conveying roller group, so that the plastic bag film accurately passes through the first ultrasonic sensor, and the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic bag production, especially to a plastic bag film detection platform. BACKGROUND

[0002] The film blowing machine needs to control the film blowing width during the plastic bag film process. The changes of airflow and temperature in the production environment, the material fluctuation during the extrusion of the material in the molten state, or the hole in the film bubble during the film blowing, all of which will cause the width of the film product to change. Therefore, the width of the film drawn out by the film blowing needs to be measured to ensure that the film width is within the allowable error range. Currently, some manufacturers can only measure the film width manually, which is not accurate and cannot detect the film width in real time. In recent years, some automatic detection devices for the width of plastic bag film have appeared. The first ultrasonic sensor at the edge of the plastic bag film tracks the edge position of the plastic bag film. The first ultrasonic sensor moves back and forth in a straight line in the width direction of the plastic bag film, and then detects the width of the plastic bag film.

[0003] For example, the utility model patent with the announcement number CN215447769U discloses a film width detection device, which includes a rack, a control circuit board, an alarm device, and two edge detection mechanisms. The alarm device and the two edge detection mechanisms are installed on the rack, and the two edge detection mechanisms are arranged in parallel. The edge detection mechanism includes a translation driving device and a first ultrasonic sensor. The first ultrasonic sensor is connected with the power output end of the translation driving device. The signal input end of the translation driving device and the signal input end of the alarm device are respectively connected with the corresponding signal output end of the control circuit board. The signal input end of the control circuit board is connected with the signal output end of the first ultrasonic sensor. The two first ultrasonic sensors are arranged oppositely. The film width detection device in the patent technical solution can automatically detect the width of the plastic film. However, the film width detection device in the prior art does not guide the plastic bag film. When it is actually installed on the rack of the film blowing machine, the edge of the plastic bag film often comes into contact with the first ultrasonic sensor due to the shaking or relaxation of the plastic bag film, or even comes out of the U-shaped opening of the first ultrasonic sensor, which causes the edge position of the plastic bag film to be unable to be accurately detected, and the width detection fails.

[0004] Therefore, it is necessary to develop a plastic bag film detection platform to solve the above-mentioned defects. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a plastic bag film detection platform, which integrates the conveying roller group to convey and guide the plastic bag film, so that the plastic bag film can accurately pass through the first ultrasonic sensor, and the measurement accuracy is improved.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model relates to a plastic bag film detection platform, comprising a frame, a control circuit board, and an edge detection mechanism. Two edge detection mechanisms are symmetrically arranged at both ends of the frame. Each edge detection mechanism includes a first ultrasonic sensor and a guide drive assembly. The platform also includes a conveyor roller assembly for guiding and transporting the plastic bag film. The conveyor roller assembly includes an upper roller shaft and a lower roller shaft arranged in parallel. The upper roller shaft is supported above the frame by shaft end supports at both ends, and the lower roller shaft is supported below the frame by shaft end supports at both ends. The plastic bag film rotates over the upper roller shaft, descends vertically, and is then conveyed forward at the lower roller shaft. The opening of the first ultrasonic sensor is inserted into the edge of the vertical section of the plastic bag film.

[0008] Furthermore, the frame includes a frame body, end plates, a front cover, and a rear cover. The frame body is made of I-beam profile. The two end plates are symmetrically fixed to both ends of the frame body. The front cover and the rear cover are respectively fastened to the openings of the front cavity and the rear cavity of the frame body. The edge detection mechanism is disposed in the front cavity of the frame body. The front cover has an elongated slot through which the first ultrasonic sensor is exposed. The control circuit board is disposed in the rear cavity of the frame body.

[0009] Furthermore, both the front and rear protective covers are attached to the front and rear sides of the frame body using a slot-type mounting method.

[0010] Furthermore, the guide drive assembly includes a guide rail support, a linear guide rail, a sliding block, a synchronous belt assembly, and a servo motor. The linear guide rail is mounted on the vertically arranged ribs of the frame body via the guide rail support at both ends. The synchronous belt assembly is arranged parallel to the linear guide rail. The servo motor is located at the end of the frame body and drives the drive pulley of the synchronous belt assembly. The sliding block guides and slides to connect with the linear guide rail. The first ultrasonic sensor is mounted on the front end face of the sliding block. The sliding block presses against the upper belt of the synchronous belt assembly and has a through hole at the lower belt position.

[0011] Furthermore, both the first ultrasonic sensor and the servo motor are electrically connected to the control circuit board, and the first ultrasonic sensor is connected to the control circuit board via a multi-core spring cable.

[0012] Furthermore, a stop post is vertically installed on the bottom plate of the front cavity of the main frame body, which blocks the spring cable from behind.

[0013] Furthermore, it also includes a sensing block and a proximity switch. The proximity switch is mounted on the fixed central shaft end of the upper roller shaft by a mounting block, and the sensing end of the proximity switch faces the end face of the upper roller shaft. The sensing block is disposed on the end face of the upper roller shaft and can pass over the sensing end of the proximity switch. The proximity switch is electrically connected to the control circuit board.

[0014] Furthermore, it also includes an alarm, which is mounted on the top plate of the frame body by T-head bolts and is electrically connected to the control circuit board.

[0015] Furthermore, it also includes a second ultrasonic sensor, which is positioned above the bubble stabilizing head of the blown film machine. The second ultrasonic sensor is capable of measuring the radius of the bubble forming section and feeding back a signal to the control circuit board.

[0016] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0017] This utility model of a plastic bag film detection platform guides the plastic bag film on the frame by adding a conveyor roller assembly consisting of an upper roller and a lower roller. This reduces the requirements for the conveyor rollers of the blown film machine. Its modular, integrated design allows for flexible installation onto the blown film machine frame. The installation positions of the upper and lower rollers are close to the first ultrasonic sensor, ensuring that the vertical section of the plastic bag film stably passes through the sensor. This utility model of a plastic bag film detection platform, by integrating the conveyor roller assembly to guide the plastic bag film, ensures its precise passage through the first ultrasonic sensor, thus improving measurement accuracy.

[0018] Furthermore, by using aluminum alloy profiles with an approximate I-shaped cross-section to construct the main frame, it is easy to form the front and rear cavities, which house the actuators and electrical control system respectively, achieving effective protective isolation. The addition of end plates, a front cover, and a rear cover effectively seals off the front and rear cavities, reducing external influences and ensuring stable operation of the internal structure. The servo motor driving the synchronous belt assembly is easily implemented in confined spaces, offering good controllability of movement precision. By using a sliding block to press against the synchronous belt of the synchronous belt assembly, the sliding block can be synchronously driven by the synchronous belt. The first ultrasonic sensor's spring cable is connected to the control circuit board, allowing for flexible adaptation to the reciprocating movement of the first ultrasonic sensor; moreover, the use of a stop post to block the spring cable prevents it from leaking out of the long slot. By installing a sensor block and a proximity switch at the end of the upper roller shaft, a signal indicating whether the upper roller shaft is rotating can be transmitted to the control circuit board, thereby determining whether the plastic bag film is being transported normally. By adding the alarm to the top plate of the main frame, an alarm will be issued promptly when the width of the plastic bag film exceeds the set range, notifying the operators to quickly correct the situation. The second ultrasonic sensor can measure the radius of the film bubble, allowing the detection platform to monitor the process from the initial stage of film formation, significantly improving the stability of equipment operation. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of the plastic bag and film testing platform of this utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of the plastic bag and film testing platform of this utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the middle AA direction;

[0023] Figure 4 This is a three-dimensional structural diagram of the present invention after the front cover has been removed;

[0024] Figure 5 This is a top view of the structure of the present invention after removing the main frame and rear cover;

[0025] Figure 6 This is a schematic diagram of the membrane bubble end detection of this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Frame body; 2. End plate; 3. Guide rail support; 4. Linear guide rail; 5. Sliding block; 6. First ultrasonic sensor; 7. Synchronous belt assembly; 701. Drive pulley; 8. Front cover; 801. Long slot; 9. Rear cover; 10. Upper roller shaft; 11. Sensing block; 12. Lower roller shaft; 13. Shaft end support; 14. Proximity switch; 15. Stop post; 16. Second ultrasonic sensor; 17. Bubble stabilizing head; 18. Film bubble; 19. Plastic bag film. Detailed Implementation

[0027] The core of this invention is to provide a plastic bag film detection platform, which guides the plastic bag film through an integrated conveyor roller assembly, enabling it to pass precisely through a first ultrasonic sensor, thereby improving the accuracy of the measurement.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Refer to the attached diagram. Figure 1 This is a three-dimensional structural diagram of the plastic bag and film testing platform of this utility model; Figure 2 This is a schematic diagram of the main structure of the plastic bag and film testing platform of this utility model; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 4 This is a three-dimensional structural diagram of the present invention after the front cover has been removed; Figure 5 This is a top view of the structure of the present invention after removing the main frame and rear cover; Figure 6 This is a schematic diagram of the membrane bubble end detection of this utility model.

[0031] In one specific implementation, such as Figures 1 to 5As shown, the plastic bag film detection platform of this utility model is similar to the prior art in that it also includes a frame, a control circuit board, and an edge detection mechanism, with two edge detection mechanisms symmetrically arranged at both ends of the frame. Each edge detection mechanism includes a first ultrasonic sensor 6 and a guide drive assembly. The guide drive assembly drives the first ultrasonic sensor 6 to reciprocate along the length of the frame. The first ultrasonic sensor 6 is a U-shaped correction sensor that uses ultrasonic waves to measure the edge position of the plastic bag film 19. The innovation of this application's plastic bag film detection platform lies in its inclusion of a conveyor roller group for guiding and transporting the plastic bag film 19. This conveyor roller group vertically guides the plastic bag film 19 through the opening of the first ultrasonic sensor 6. The conveyor roller group includes an upper roller shaft 10 and a lower roller shaft 12 arranged in parallel. The upper roller shaft 10 is supported above the frame by shaft end supports 13 at both ends, and the lower roller shaft 12 is supported below the frame by shaft end supports 13 at both ends. After the plastic bag film 19 rotates on the upper roller 10, it is vertically downward and then forward at the lower roller 12. The opening of the first ultrasonic sensor 6 is inserted into the edge of the vertical section of the plastic bag film 19.

[0032] Specifically, such as Figure 3 As shown, both the upper roller shaft 10 and the lower roller shaft 12 are supported on a fixed central shaft by radial bearings, and both the upper roller shaft 10 and the lower roller shaft 12 are rubber rollers.

[0033] The conveying roller assembly, consisting of an upper roller shaft 10 and a lower roller shaft 12, guides the plastic bag film 16 on the frame, reducing the requirements for the conveying rollers of the blown film machine. Its modular, integrated design allows for flexible installation onto the blown film machine frame. The installation positions of the roller shafts 10 and 12 are close to the first ultrasonic sensor 6, ensuring that the vertical section of the plastic bag film 19 stably passes through the first ultrasonic sensor 6. This utility model's plastic bag film detection platform, through the integrated conveying roller assembly, guides and transports the plastic bag film, enabling it to accurately pass through the first ultrasonic sensor, thus improving measurement accuracy.

[0034] In one specific embodiment of this utility model, such as Figures 1 to 5 As shown, the frame includes a main frame 1, end plates 2, a front cover 8, and a rear cover 9. The main frame 1 is made of aluminum alloy profile with an approximate I-shaped cross-section. Two end plates 2 are symmetrically arranged at both ends of the main frame 1 and are fixed together with screws. The front cover 8 and the rear cover 9 are respectively fastened to the openings of the front and rear cavities of the main frame 1. The edge detection mechanism is located in the front cavity of the main frame 1. The front cover 8 has a long slot 801 exposed by the first ultrasonic sensor 6, and the long slot 801 is opened horizontally. The control circuit board is located in the rear cavity of the main frame 1.

[0035] Specifically, the control circuit board is a PCB circuit board, which is not shown in the attached drawings; the control circuit board includes a microcontroller and its peripheral circuits, and the microcontroller is programmed with a control program. There are many similar electronic control modules in the prior art, which is not the innovation of this application, and will not be elaborated here.

[0036] Specifically, such as Figure 3 As shown, both the front cover 8 and the rear cover 9 are attached to the front and rear sides of the frame body 1 using a slot method.

[0037] The frame body 1 is made of aluminum alloy profile with an I-shaped cross section, which facilitates the forming of the front and rear cavities, where the actuators and electrical control system are placed respectively, thus achieving effective protective isolation. The addition of end plates 2, front guards 8 and rear guards 9 can seal the front and rear cavities, reducing external influences and ensuring the stable operation of the internal structure.

[0038] In one specific embodiment of this utility model, the guiding drive assembly includes a guide rail support 3, a linear guide rail 4, a sliding block 5, a synchronous belt group 7, and a servo motor. The linear guide rail 4 is mounted on the vertically arranged rib sidewall of the frame body 1 via the guide rail support 3 at both ends. The synchronous belt group 7 is arranged parallel to the linear guide rail 4, and the servo motor is located at the end of the frame body 1 and drives the drive pulley 701 of the synchronous belt group 7. The sliding block 5 guides and slides to connect with the linear guide rail 4. A first ultrasonic sensor 6 is installed on the front end face of the sliding block 5. The sliding block 5 presses against the upper belt of the synchronous belt group 7, and a through hole is opened at the lower belt position of the synchronous belt.

[0039] Obviously, the guide drive assembly can also use a hydraulic motor to drive the drive pulley 701 to rotate, and the timing belt group 7 can also be replaced by a chain and sprockets. Similar simple replacement methods all fall within the protection scope of this utility model.

[0040] By setting the servo motor to drive the synchronous belt group 7, it is easy to implement in narrow spaces, and the movement accuracy is well controllable. By pressing the sliding block 5 against the synchronous belt of the synchronous belt group 7, the sliding block 5 can be synchronously driven by the synchronous belt.

[0041] In one specific embodiment of this utility model, such as Figures 1 to 4 As shown, both the first ultrasonic sensor 6 and the servo motor are electrically connected to the control circuit board. The first ultrasonic sensor 6 is connected to the control circuit board via a multi-core spring cable. The first ultrasonic sensor 6 is an ultrasonic first ultrasonic sensor.

[0042] Specifically, such as Figure 3 and Figure 4As shown, a stop post 15 is vertically installed on the bottom plate of the front cavity of the frame body 1, which blocks the spring cable behind it. The stop post 15 is installed and fixed by countersunk screws.

[0043] By setting the spring cable of the first ultrasonic sensor 6 to be connected to the control circuit board, the reciprocating position of the first ultrasonic sensor 6 can be flexibly adapted; and by using the stop post 15 to block the spring cable, the spring cable can be prevented from leaking out from the long slot hole 801.

[0044] In one specific embodiment of this utility model, such as Figures 1 to 5 As shown, the plastic bag film detection platform of this utility model also includes a sensing block 11 and a proximity switch 14. The proximity switch 14 is mounted on the fixed central shaft end of the upper roller 10 via a mounting block, with the sensing end of the proximity switch 14 facing the end face of the upper roller 10. The sensing block 11 is disposed on the end face of the upper roller 10, and the sensing block 11 can pass over the sensing end of the proximity switch 14 and trigger the proximity switch 14 to operate. The proximity switch 14 is electrically connected to the control circuit board.

[0045] By installing a sensing block 11 and a proximity switch 14 at the end of the upper roller shaft 10, a signal indicating whether the upper roller shaft 10 is rotating can be transmitted to the control circuit board, thereby determining whether the plastic bag film 19 is in the normal conveying process.

[0046] In one specific embodiment of this utility model (not shown in the accompanying drawings), the plastic bag film detection platform of this utility model also includes an alarm. The alarm is mounted on the top plate of the frame body 1 via T-head bolts, and the top plate of the frame body 1 has a continuous T-head bolt mounting groove. The alarm is electrically connected to the control circuit board.

[0047] Specifically, the alarm is an audible and visual alarm. The height of the alarm is below the top edge of the upper roller shaft 10.

[0048] By adding the alarm to the top plate of the frame body 1, when the width of the plastic bag film 19 exceeds the set range, an alarm message will be issued in a timely manner to notify the operators to quickly correct the situation.

[0049] In one specific embodiment of this utility model, such as Figure 6 As shown, the plastic bag film detection platform of this utility model also includes a second ultrasonic sensor 16. The second ultrasonic sensor 16 is mounted on the frame of the blown film machine and positioned above the bubble stabilizing head 17 of the blown film machine. It is a horizontally positioned ultrasonic ranging sensor. The second ultrasonic sensor 16 can measure the distance to the outer wall of the forming section of the film bubble 18, thereby reflecting the radius of the film bubble 18 and feeding back the signal to the control circuit board.

[0050] When the film bubble 18 leaks air unexpectedly, its radius decreases rapidly. At this point, the control circuit board receives a signal from the second ultrasonic sensor 16 and issues a control command to increase the compressed air supply to the blown film machine, causing the film bubble 18 to be inflated again. This roughly ensures that the width of the plastic bag film 19 does not change significantly. Alternatively, it can issue an alarm to alert staff for emergency handling.

[0051] The radius of the membrane bubble 18 can be measured by the second ultrasonic sensor 16, enabling the detection platform to monitor the initial stage of film formation, which greatly improves the stability of equipment operation.

[0052] The working process of this utility model's plastic bag film detection platform is illustrated using a blown film machine as an example. The platform is mounted on the blown film machine frame via a side support plate. Before operation, the plastic bag film 19 from the blown film machine is manually rotated from the upper roller 10 downwards to the lower roller 12, then conveyed forward and backward from the lower roller 12. At this time, the opening of the first ultrasonic sensor 6 is inserted into the edge of the vertical section of the plastic bag film 19. During normal operation, the proximity switch 14 continuously collects the rotation signal of the upper roller 10, and the control program on the control circuit board determines that the plastic bag film 19 is being continuously and normally conveyed. The first ultrasonic sensor 6 measures the edge position signal of the plastic bag film 19 in real time and transmits it to the control program on the control circuit board. When the width of the plastic bag film 19 changes, the control program on the control circuit board issues a control command. The servo motor drives the synchronous belt group 7, which in turn drives the sliding block 5. The sliding block 5 then moves the first ultrasonic sensor 6 left and right, following the edge position of the plastic bag film 19. When the width of the plastic bag film 19 changes beyond the set range, the control circuit board control program issues an alarm command, and the alarm device issues an alarm message to notify the operator to quickly correct the reaction.

[0053] In summary, this utility model's plastic bag film detection platform, by adding a conveying roller assembly consisting of an upper roller shaft 10 and a lower roller shaft 12 to guide the plastic bag film 16 on the frame, reduces the requirements for the blown film machine's conveying rollers. Its modular, integrated design facilitates flexible installation onto the blown film machine frame. The installation positions of the roller shafts 10 and 12 are close to the first ultrasonic sensor 6, ensuring that the vertical section of the plastic bag film 19 stably passes through the first ultrasonic sensor 6. This utility model's plastic bag film detection platform, by integrating the conveying roller assembly to guide the plastic bag film, ensures its precise passage through the first ultrasonic sensor, improving measurement accuracy. Furthermore, by using an aluminum alloy profile with a roughly I-shaped cross-section to construct the frame body 1, it is easy to form the front and rear cavities, respectively housing the actuators and the electrical control system, achieving effective protective isolation. The addition of end plates 2, a front cover 8, and a rear cover 9 allows for the sealing of the front and rear cavities, reducing external influences and ensuring the stable operation of the internal structure. By setting the servo motor to drive the synchronous belt group 7, it is easy to implement in narrow spaces and the movement accuracy is well controllable. The sliding block 5 presses against the synchronous belt of the synchronous belt group 7, allowing the sliding block 5 to be synchronously driven by the synchronous belt. The first ultrasonic sensor 6 is connected to the control circuit board via a spring cable, which can flexibly adapt to the reciprocating movement of the first ultrasonic sensor 6; and the use of the stop post 15 to block the spring cable prevents it from leaking out of the long slot 801. By installing a sensing block 11 and a proximity switch 14 at the end of the upper roller shaft 10, the signal indicating whether the upper roller shaft 10 is rotating can be transmitted to the control circuit board, thereby determining whether the plastic bag film 19 is in normal conveying process. By adding an alarm to the top plate of the frame body 1, when the width of the plastic bag film 19 exceeds the set range, an alarm message is promptly issued, notifying the operator to quickly correct the situation. The second ultrasonic sensor 16 can measure the radius of the film bubble 18, allowing the detection platform to monitor the initial stage of film formation, significantly improving the stability of equipment operation.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0055] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A plastic bag film detection platform, comprising a frame, a control circuit board, and an edge detection mechanism, wherein two edge detection mechanisms are symmetrically arranged at both ends of the frame, and each edge detection mechanism includes a first ultrasonic sensor (6) and a guide drive assembly; characterized in that, It also includes a conveying roller assembly for guiding and conveying the plastic bag film (19). The conveying roller assembly includes an upper roller shaft (10) and a lower roller shaft (12) arranged in parallel. The upper roller shaft (10) is supported above the frame by shaft end supports (13) at both ends, and the lower roller shaft (12) is supported below the frame by shaft end supports (13) at both ends. After the plastic bag film (19) rotates over the upper roller shaft (10), it is vertically downward and then forward at the lower roller shaft (12). The opening of the first ultrasonic sensor (6) is inserted into the edge of the vertical section of the plastic bag film (19).

2. The plastic bag / film detection platform according to claim 1, characterized in that, The frame includes a frame body (1), end plates (2), a front cover (8), and a rear cover (9). The frame body (1) is made of I-beam profile. The two end plates (2) are symmetrically fixed to both ends of the frame body (1). The front cover (8) and the rear cover (9) are respectively fastened to the openings of the front cavity and the rear cavity of the frame body (1). The edge detection mechanism is located in the front cavity of the frame body (1). The front cover (8) has an elongated slot (801) on which the first ultrasonic sensor (6) is exposed. The control circuit board is located in the rear cavity of the frame body (1).

3. The plastic bag / film detection platform according to claim 2, characterized in that, Both the front cover (8) and the rear cover (9) are attached to the front and rear sides of the frame body (1) by means of a slot.

4. The plastic bag / film detection platform according to claim 2, characterized in that, The guide drive assembly includes a guide rail support (3), a linear guide rail (4), a sliding block (5), a synchronous belt group (7), and a servo motor. The linear guide rail (4) is mounted on the vertically arranged ribs of the frame body (1) through the guide rail support (3) at both ends. The synchronous belt group (7) is arranged parallel to the linear guide rail (4). The servo motor is located at the end of the frame body (1) and drives the drive pulley (701) of the synchronous belt group (7). The sliding block (5) guides and slides to connect the linear guide rail (4). The first ultrasonic sensor (6) is installed on the front end face of the sliding block (5). The sliding block (5) presses against the upper synchronous belt of the synchronous belt group (7) and has a through hole at the lower synchronous belt position.

5. The plastic bag / film detection platform according to claim 4, characterized in that, The first ultrasonic sensor (6) and the servo motor are both electrically connected to the control circuit board. The first ultrasonic sensor (6) is connected to the control circuit board via a multi-core spring cable.

6. The plastic bag / film detection platform according to claim 5, characterized in that, A stop post (15) is vertically installed on the bottom plate of the front cavity of the frame body (1), and the stop post (15) blocks the spring cable behind.

7. The plastic bag / film detection platform according to claim 1, characterized in that, It also includes a sensing block (11) and a proximity switch (14). The proximity switch (14) is mounted on the fixed central shaft end of the upper roller (10) by a mounting block, and the sensing end of the proximity switch (14) faces the end face of the upper roller (10). The sensing block (11) is disposed on the end face of the upper roller (10) and can pass over the sensing end of the proximity switch (14). The proximity switch (14) is electrically connected to the control circuit board.

8. The plastic bag / film detection platform according to claim 2, characterized in that, It also includes an alarm, which is mounted on the top plate of the frame body (1) by T-head bolts and is electrically connected to the control circuit board.

9. The plastic bag / film detection platform according to claim 1, characterized in that, It also includes a second ultrasonic sensor (16), which is located above the bubble stabilizing head (17) of the blown film machine. The second ultrasonic sensor (16) can measure the radius of the forming section of the film bubble (18) and feed back the signal to the control circuit board.

Images