A plastic packaging container conveying device for food production

Abstract

This invention provides a conveying device for plastic packaging containers used in food production, belonging to the technical field of conveying devices. It includes: two sets of linear belt conveyors, respectively configured as an inlet and outlet line; a corner belt conveyor located at one end of the two linear belt conveyors, connecting the inlet and outlet lines and forming a 180° turning conveying path; and a transition conveyor located at the junction of the linear and corner belt conveyors. The corner belt conveyor is equipped with a correction mechanism, which includes: a support plate mounted on the corner belt conveyor; a slide rail mounted on the support plate; a slider slidably connected to the slide rail; a correction plate mounted on the top of the slider; an electromagnetic rail mounted on the support plate; a permanent magnet array located at the bottom of the correction plate; an offset detection element located on the corner belt conveyor; and a controller mounted on the corner belt conveyor. This device possesses the ability to actively detect and dynamically correct deviations.

Description

Technical Field

[0001] This invention relates to the field of conveying device technology, and more specifically, to a conveying device for plastic packaging containers used in food production. Background Technology

[0002] In automated production lines for food plastic packaging containers, continuous container transfer typically requires a combination of linear conveyors and 180° corner conveyors to facilitate reversing and transfer, adapting to production line layouts and saving workshop space. Currently, most traditional corner belt conveyor structures use fixed steel plates supported by side limit wheels, relying solely on passive blocking and limiting by the side limit wheels, lacking active detection, dynamic correction, and adaptive reset capabilities.

[0003] In actual conveying processes, 180° corner belts are easily affected by factors such as centrifugal force, tension difference between inner and outer rings, thermal expansion and contraction of the belt, installation errors, and start-stop impacts, making them prone to outward or inward lateral deviation and misalignment. However, traditional limiting structures can only provide rigid blocking after the belt deviation exceeds the limit, and cannot intervene and correct it in the early stages of misalignment. Under long-term operation, the belt edge continuously rubs against the limiting wheel, which easily causes belt edge wear, wrinkling, wear and aging. This not only leads to the continuous accumulation of belt misalignment and poor conveying stability, but also easily causes problems such as plastic packaging containers tipping over, jamming, and misalignment, affecting the overall production rhythm and product conveying quality. It also causes frequent belt damage and replacement, increasing equipment maintenance costs and downtime, and seriously affecting the continuous and stable operation of the food packaging production line. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a conveying device for plastic packaging containers used in food production. This addresses the issue that existing devices only have passive limiting functions, cannot achieve active detection and dynamic correction, and suffer from severe belt wear.

[0005] The purpose and effect of the plastic packaging container conveying device for food production of the present invention are achieved by the following specific technical means: This invention provides a conveying device for plastic packaging containers used in food production, comprising: Two sets of linear belt conveyors are configured as the infeed line and the discharge line, respectively; A corner belt conveyor line is set at one end of the two sets of straight belt conveyors, connecting the feed line and the discharge line and forming a 180° turning conveyor path. A transition conveyor line is provided at the junction of the straight belt conveyor line and the corner belt conveyor line; The corner belt conveyor is equipped with a deviation correction mechanism, which includes: Support plate, installed on the corner belt conveyor line; The slide rail is mounted on the support plate; The slider is slidably connected to the slide rail; A correction plate is installed on top of the slider; An electromagnetic rail is mounted on the support plate; A permanent magnet array is disposed at the bottom of the correction plate; An offset detection element is installed on the corner belt conveyor line; The controller is installed on the corner belt conveyor. After receiving the offset signal transmitted by the offset detection device, the controller controls the electromagnetic rail to generate an alternating magnetic field. The alternating magnetic field cooperates with the magnetic field of the permanent magnet array to drive the correction plate to slide along the slide rail with the slider, and generate a reverse relative motion with the belt of the corner belt conveyor.

[0006] As a preferred embodiment, the support plate is provided with a bearing plate, and the bearing plate is provided with multiple sets of first limiting grooves and multiple sets of second limiting grooves. The first limiting grooves and the second limiting grooves are alternately distributed on the bearing plate. The opening of the first limiting groove faces the belt side of the corner belt conveyor, and the opening direction of the second limiting groove is opposite to that of the first limiting groove. The first limiting groove and the second limiting groove are used to limit the movement range of the correction plate; The support plate is provided with multiple sets of reset components for resetting the slider.

[0007] As a preferred embodiment, the support plate is provided with multiple sets of sliding grooves, each sliding groove is provided with a roller frame, and a sliding belt is sleeved on the roller frame; The sliding groove is located between the first limiting groove and the second limiting groove, and the top of both the sliding belt and the correction plate are provided with damping pads.

[0008] As a preferred embodiment, the permanent magnet array consists of multiple sets of permanent magnets arranged with alternating N and S poles along the length of the slide rail to form an alternating static magnetic field; When the electromagnetic rail is energized, it generates an alternating NS magnetic field. The alternating static magnetic field and the alternating NS magnetic field couple to form a horizontal bidirectional thrust.

[0009] As a preferred embodiment, the correction plate is divided into a group A plate and a group B plate, and the group A plate and the group B plate are arranged alternately along the conveying direction; The permanent magnet array poles on the A group plate and the B group plate are arranged in opposite directions. The electromagnetic rail synchronously outputs a reverse alternating magnetic field, driving the adjacent A group plate and the B group plate to slide back and forth in opposite directions along the slide rail.

[0010] In a preferred embodiment, the offset detection elements are in multiple sets, evenly distributed along the circumferential direction of the corner belt conveyor line, and the offset detection elements include: The base is installed on the corner belt conveyor line; The mounting cylinder is installed on the base; The detection rod is inserted into the mounting cylinder; A roller is installed at the end of the detection rod away from the mounting cylinder, and one end is in contact with the belt of the corner belt conveyor. A reset spring is sleeved on the detection rod to reset the detection rod.

[0011] As a preferred embodiment, the offset detection element further includes: A pressure-sensing membrane is wrapped around the roller; A sliding plate is installed at the end of the detection rod away from the roller and is slidably connected to the mounting cylinder; A magnetic ring is mounted on the sliding plate; A magnetic field detector is installed at the end of the mounting cylinder away from the corner belt conveyor line, with the detection end of the magnetic field detector facing the magnetic ring.

[0012] In a preferred embodiment, the transition conveyor line includes a frame, a turntable, and a connecting shaft; The frame is installed on the linear belt conveyor line, the connecting shaft passes through the frame, the top of the frame is equipped with a drive motor, the drive motor is connected to the connecting shaft, the turntable is sleeved on the connecting shaft, and the turntable has multiple sets of grooves for holding packaging containers.

[0013] As a preferred embodiment, the transition conveyor line further includes a base and ball bearings; The base is mounted on the frame, the frame is provided with a limiting plate, and the ball bearings are embedded in the base.

[0014] As a preferred embodiment, the control method of the controller is as follows: S1. When the equipment is running normally, the offset detection element contacts the belt of the corner belt conveyor line, continuously collects the lateral offset of the belt, and transmits the detection signal to the controller; S2. The controller analyzes and judges the received offset signal. When the belt is detected to be in the center state, the controller controls the electromagnetic rail to output an alternating magnetic field to drive the correction plate to slide back and forth at low speed. S3. When a lateral deviation of the belt is detected, the controller adjusts the magnetic field strength and phase of the electromagnetic rail, increases the magnetic force output on the corresponding side, drives the correction plate to generate a lateral reset force, and gradually corrects the belt to the center position. S4. After the belt is reset to the standard position, the controller controls the electromagnetic rail to resume normal working state and repeatedly executes the above detection and correction process.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the coordinated setup of a circumferentially evenly distributed offset detection component and a controller, enables the device to actively detect and dynamically correct deviations, thus enhancing its adaptability. The device can collect minute offset data of the corner belt through the offset detection component, capturing potential early-stage belt misalignment. Then, in conjunction with the controller, it adaptively adjusts the magnetic field parameters of the electromagnetic rail to specifically drive the correction plate to complete the reset and correction, suppressing the accumulation of belt misalignment from the source. This overcomes the shortcomings of traditional devices that can only passively and rigidly limit movement, solving the problems of belt deviation and conveying misalignment, and improving the device's stable ability to center the belt during conveying.

[0016] 2. When using this device, the magnetic field coupling structure between the electromagnetic rail and the permanent magnet array drives the two sets of correction plates (A and B) to slide back and forth at low speed in opposite directions. This counteracts the centrifugal offset force and sliding friction generated by the belt turning, allowing the belt to make flexible contact with the correction plates. This avoids hard friction wear, wrinkling, and aging of the belt edges, thus improving the belt protection capability of the device. Then, through the auxiliary cooperation of the limiting groove, reset component, and damping pad, the sliding stroke of the correction plate is limited, ensuring smooth and vibration-free correction operation. This makes the belt conveyor continuous and stable, eliminating container tipping and material jamming problems, reducing the frequency of belt replacement and equipment downtime, and improving the adaptability and economy of the device for continuous production operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of the invention; Figure 2 This is a schematic diagram of the corner belt conveyor of the invention; Figure 3 This is a schematic diagram of the installation structure of the correction plate of the invention; Figure 4 This is a schematic diagram of the slide rail and slider of the invention; Figure 5 This is a schematic diagram of the structure of the support plate of the invention; Figure 6 This is a schematic diagram of the sliding band structure of the invention; Figure 7 This is a schematic diagram of the assembly structure of the offset detection component of the invention; Figure 8 This is a schematic diagram of the disassembled structure of the offset detection component of the invention; Figure 9 This is a schematic diagram of the internal structure of the offset detection component of the invention; Figure 10This is a schematic diagram of the corner belt conveyor line of the invention.

[0018] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows: 101. Straight belt conveyor; 102. Corner belt conveyor; 103. Transition conveyor; 201. Support plate; 202. Slide rail; 203. Slider; 204. Correction plate; 2041. Group A plate; 2042. Group B plate; 205. Electromagnetic rail; 206. Permanent magnet array; 207. Controller; 208. Bearing plate; 209. First limiting groove; 211. Second limiting groove; 212. Reset component; 213. Sliding groove ; 214, Roller frame; 215, Sliding belt; 301, Base; 302, Mounting cylinder; 303, Detection rod; 304, Roller; 305, Return spring; 306, Pressure detection diaphragm; 307, Sliding plate; 308, Magnetic ring; 309, Magnetic field detector; 401, Frame; 402, Turntable; 403, Connecting shaft; 404, Drive motor; 405, Groove; 406, Base; 407, Ball bearing; 408, Limiting plate. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0020] Example: like Figures 1 to 10 As shown, the present invention provides a conveying device for plastic packaging containers used in food production, comprising: Two sets of linear belt conveyors 101 are arranged side by side and are configured as the material inlet and outlet lines respectively, to complete the linear and stable conveying of plastic packaging containers.

[0021] The corner belt conveyor 102 is set at one end of two sets of straight belt conveyors 101, connecting the feed line and the discharge line and forming a 180° turning conveying path. It can complete the turning and transfer of materials, adapt to the compact layout of the workshop, and ensure that the conveying operation is continuous and uninterrupted.

[0022] The transition conveyor line 103 is set at the junction of the straight belt conveyor line 101 and the corner belt conveyor line 102. It can fill the gap and drop at the junction, realize the transition between straight conveying and turning conveying, prevent plastic packaging containers from jamming or tipping over, and improve the overall conveying stability.

[0023] The corner belt conveyor 102 is equipped with a correction mechanism, which includes: The support plate 201 is bolted to the corner belt conveyor 102 and serves as the load-bearing base for the entire correction mechanism. The slide rail 202 is installed on the support plate 201 and provides guidance for the sliding of the slider 203. There are multiple sets of slide rails 202, which are evenly distributed along the conveying direction of the corner belt conveyor 102. The central axis of each set of slide rails 202 intersects with the center of the corner belt conveyor 102.

[0024] The slider 203 is slidably connected to the slide rail 202 and can move back and forth along the slide rail 202. The correction plate 204 is installed on the top of the slider 203 to support and correct the conveyor belt. Its surface is treated with wear-resistant smoothness to reduce the sliding friction between the correction plate 204 and the conveyor belt, thereby reducing belt wear, scratches and tensile deformation. The electromagnetic rail 205, mounted on the support plate 201, can output alternating magnetic fields of different frequencies and intensities according to the instructions of the controller 207, providing a controllable magnetic field power source for correction and sliding; a flat linear electromagnetic drive rail, model TMC-80 series electromagnetic rail, can be used.

[0025] The permanent magnet array 206 is located at the bottom of the correction plate 204 and forms a stable magnetic field coupling structure with the electromagnetic rail 205. It can generate a horizontal thrust under the action of the magnetic field of the electromagnetic rail 205, driving the correction plate 204 to achieve reciprocating sliding motion.

[0026] Offset detection components are installed on the corner belt conveyor 102. They can collect lateral offset data of the belt in the turning section, capture the belt deviation trend, and provide reliable detection signals for correction control. There are multiple sets of offset detection components, which are evenly arranged on the outer wall of the corner belt conveyor 102.

[0027] The controller 207 is installed on the corner belt conveyor 102. After receiving the offset signal transmitted by the offset detection device, the controller 207 analyzes the belt offset state and controls the electromagnetic rail 205 to generate a corresponding alternating magnetic field. The alternating magnetic field cooperates with the magnetic field of the permanent magnet array 206 to drive the correction plate 204 to slide along the slide rail 202 with the slider 203. This causes the correction plate 204 to generate opposite relative motion with the belt of the corner belt conveyor 102, which reduces the sliding friction of the belt when turning and reduces wear. It can also dynamically correct the belt offset and realize the automatic centering and correction of the belt, ensuring continuous stability, no deviation, and no edge wear faults in the corner conveying process. The controller 207 can be a H0U-1616MR model programmable logic controller.

[0028] The bearing plate 208 is installed on the top of the support plate 201 and serves as a limiting and auxiliary bearing structure for the correction plate 204. Multiple sets of first limiting grooves 209 and multiple sets of second limiting grooves 211 are provided on the bearing plate 208. The first limiting grooves 209 and second limiting grooves 211 are alternately distributed on the bearing plate 208. The opening of the first limiting groove 209 faces the belt side of the corner belt conveyor 102, and the opening direction of the second limiting groove 211 is opposite to that of the first limiting groove 209, so as to achieve a bidirectional alignment layout.

[0029] The first limiting groove 209 and the second limiting groove 211 are used to limit the lateral movement range of the correction plate 204 in both directions. They can limit the left and right sliding limit positions of the correction plate 204, prevent the correction plate 204 from sliding over the limit or misaligning, prevent overcorrection or failure, and ensure that the correction action is controllable.

[0030] The support plate 201 is provided with multiple sets of reset components 212 for resetting the slider 203. The reset components 212 are symmetrically arranged at one end of the sliding stroke of the slider 203. After the equipment is running normally or after the correction is completed, they can help the slider 203 and the correction plate 204 return to the center initial position, realize automatic reset and adaptive rebound, ensure consistent accuracy of each correction cycle, and improve the stability and correction repeatability of the device in long-term operation. The reset component 212 consists of two sets of mounting blocks. One set of mounting blocks is fixedly connected to the slider 203, and the other set is fixedly connected to the support plate 201. The two sets of mounting blocks are connected by a spring.

[0031] The support plate 208 is provided with multiple sets of sliding grooves 213. The multiple sets of sliding grooves 213 are regularly opened on the working surface of the support plate 208. A roller frame 214 is embedded and fixed inside the sliding groove 213. Two sets of freely rotatable rollers are arranged inside the roller frame 214. A sliding belt 215 is movably sleeved on the roller frame 214, which can achieve smooth and cyclic sliding by relying on the roller frame 214, thereby reducing the sliding resistance at the upper and lower docking positions of the correction plate 204. The sliding groove 213 is arranged in the area between the first limiting groove 209 and the second limiting groove 211 to ensure that the sliding movement is always within the bidirectional limiting stroke range and to avoid sliding interference and position deviation. The sliding belt 215 and the top surface of the correction plate 204 are both fitted with damping pads. The damping pads have flexible, wear-resistant and anti-slip properties, which can reduce the impact wear caused by the hard contact between the belt and the correction plate 204.

[0032] The permanent magnet array 206 consists of multiple sets of highly stable permanent magnets evenly arranged along the length of the slide rail 202, and installed strictly according to the alternating arrangement of N and S poles. This creates a uniform and stable alternating static magnetic field at the bottom of the correction plate 204. The magnetic field distribution is uniform and not easily attenuated, maintaining a stable magnetic field output for a long time. The main body of the permanent magnet array 206 is a magnetically shielded epoxy plastic base, which has excellent magnetic shielding, insulation and anti-interference performance. It can block magnetic field crosstalk and magnetic force cancellation between adjacent permanent magnets, avoid magnetic field disorder and magnetic force attenuation, and ensure that the magnetic field of each set of permanent magnets is independent and uniformly output. It also has the characteristics of wear resistance, high temperature resistance and not easily deformed, making it suitable for the long-term reciprocating sliding working environment of the equipment, ensuring the accuracy of magnetic field coupling drive and correction stability.

[0033] When the electromagnetic rail 205 is energized, it generates a dynamic alternating magnetic field (NS) corresponding to the permanent magnet array 206. This causes the lower alternating static magnetic field to couple with the upper dynamic alternating magnetic field (NS). Through the magnetic principle that like poles repel and unlike poles attract, an adaptive horizontal bidirectional thrust is generated. This thrust can drive the correction plate 204 to slide bidirectionally according to the control signal, thus achieving bidirectional dynamic correction.

[0034] The correction plate 204 is divided into group A plate 2041 and group B plate 2042. Group A plate 2041 and group B plate 2042 are arranged alternately along the conveying direction of the corner belt conveyor line 102, covering the bottom surface of the belt in sections. The permanent magnet array 206 on group A plate 2041 and group B plate 2042 have opposite magnetic pole arrangement directions. The electromagnetic rail 205 synchronously outputs a reverse alternating magnetic field, driving the adjacent group A plate 2041 and group B plate 2042 to slide back and forth in opposite directions along the slide rail 202.

[0035] Among them, plate A 2041 is specifically used to correct the inward deviation trend of the belt, while plate B 2042 is used to correct the outward deviation trend of the belt. The two sets of plates work together and alternately to specifically address the problem of bidirectional deviation of the corner belt caused by centrifugal force and tension difference. The division of labor for zoned correction is clear, which can constrain the belt running trajectory in all directions and continuously maintain the belt in a centered running state.

[0036] like Figure 1 , Figures 7 to 9 As shown, there are multiple sets of offset detection components, evenly distributed along the circumference of the corner belt conveyor line 102. The offset detection components include: The base 301 is fixedly installed on the side frame of the corner belt conveyor 102 as the mounting base for the offset detection component, ensuring structural stability. Mounting cylinder 302 is mounted on base 301 to provide mounting cavity and motion guide for internal moving components; The detection rod 303 is inserted into the mounting cylinder 302 and can slide linearly back and forth along the inner wall of the mounting cylinder 302 to transmit the mechanical displacement caused by belt deviation. The roller 304 is rotatably mounted on the end of the detection rod 303 away from the mounting cylinder 302. The outer side of the roller body is always in contact with the belt surface of the corner belt conveyor 102. It moves in position synchronously with the belt offset, reducing contact friction and belt damage. The reset spring 305 is fitted on the outside of the detection rod 303 and limited inside the mounting cylinder 302. When the belt returns to the center position, it can push the detection rod 303 and the roller 304 to quickly reset, ensuring that the component returns to its position in time after the detection cycle is completed.

[0037] The offset detection component also includes: A pressure sensing diaphragm 306, covering the roller 304, senses changes in the contact pressure between the belt and the roller 304. This offset detection device uses the normal centered position of the belt as a reference. When the belt shifts inward, it loses contact with the roller 304, and the pressure sensing diaphragm 306 cannot detect the contact pressure, allowing the system to determine an inward offset. When the belt shifts outward, it continuously presses against the roller 304, increasing the pressure value collected by the pressure sensing diaphragm 306, thus distinguishing between the inward and outward offset states. The pressure sensing diaphragm 306 can be an FSR402 thin-film pressure sensor. The sliding plate 307 is installed on the end of the detection rod 303 away from the roller 304, and slides in conjunction with the inner wall of the mounting cylinder 302, moving synchronously with the detection rod 303. The magnetic ring 308 is fixedly embedded in the sliding plate 307 and can synchronously change its spatial position with the sliding plate 307 to form a displacement trigger source. The magnetic field detector 309 is fixedly installed at the bottom end of the mounting cylinder 302 away from the corner belt conveyor 102. Its detection end is positioned directly opposite the magnetic ring 308. It can capture the difference in magnetic field signal caused by the change in the position of the magnetic ring 308, convert the mechanical displacement into an electrical signal and transmit it to the controller 207, providing data support for subsequent graded correction and bidirectional calibration.

[0038] like Figure 1 , Figure 10 As shown, the transition conveyor line 103 includes a frame 401, a turntable 402 and a connecting shaft 403, and is used as a whole to connect the straight belt conveyor line 101 and the corner belt conveyor line 102 to achieve a smooth material reversal transition. The frame 401 is fixedly installed at the end of the linear belt conveyor 101, serving as the main support for the entire transition mechanism. The connecting shaft 403 is vertically inserted inside the frame 401 and can rotate smoothly under the driving force, providing a rotation reference for the turntable 402. A drive motor 404 is fixedly mounted on the top of the frame 401. The output end of the drive motor 404 forms a reliable transmission connection with the connecting shaft 403, providing stable power for the rotation of the connecting shaft 403. The speed can be adjusted according to the conveying rhythm. Its speed matches the running speed of the linear belt conveyor 101 and the corner belt conveyor 102. The turntable 402 is sleeved on the connecting shaft 403 and rotates synchronously with the connecting shaft 403. The turntable 402 has multiple sets of grooves 405 for holding packaging containers. The grooves 405 can limit and position the containers to prevent slippage and tipping during the transfer process, ensuring the stability of the container posture and orderly completing the material transfer between the two conveyor lines.

[0039] The transition conveyor line 103 also includes a base 406 and ball bearings 407, which are used to assist the turntable 402 to rotate smoothly and reduce operating resistance. The base 406 is fixedly mounted on the upper surface of the frame 401, providing an installation carrier and positioning base for the ball bearings 407. A limit plate 408 is provided at a corresponding position on the frame 401 to constrain the position of the base 406 and surrounding components, preventing deviation and shaking during operation. The ball bearings 407 are evenly embedded on the surface of the base 406, and the bottom of the turntable 402 contacts the ball bearings 407. During rotation, the ball bearings 407 form rolling support, reducing the rotational friction resistance of the turntable 402, making the operation smoother. At the same time, it shares the load of the turntable 402 and the container, reduces the load on the drive motor 404, and extends the service life of the components.

[0040] The control method of controller 207 is as follows: S1. During normal operation, multiple sets of offset detection elements distributed around the circumference of the corner belt conveyor 102 are always in contact with the sidewall of the belt of the corner belt conveyor 102. Relying on the cooperation structure of the roller 304 and the pressure detection membrane 306, the lateral offset direction, offset amplitude in the range of 0.1mm to 5mm, and contact pressure changes during the belt operation are continuously collected at a high frequency of 10ms. The collected analog detection signals are converted into standard voltage signals and stably transmitted to the controller 207 for summarization, calculation and processing. This achieves uninterrupted monitoring of the operating status of the corner belt in the 360° turning area, with no monitoring blind spots and no data delay, ensuring that the belt offset status is traceable.

[0041] S2, the controller 207 integrates, compares, and analyzes the received multiple sets of offset detection signals. The preset belt centering reference offset is ±0.1mm. When the detection data shows that the belt offset is within the ±0.1mm reference range and the belt is in a standard centered running state, the controller 207 continuously controls the electromagnetic rail 205 to output a constant parameter alternating magnetic field with a frequency of 50Hz and a voltage of 24V. With the magnetic field coupling effect of the permanent magnet array 206, it drives the A group plate 2041 and the B group plate 2042 to perform low-speed, small-stroke reciprocating sliding according to a preset rhythm. The normal sliding stroke is controlled between 2mm and 5mm. This normal micro-sliding method can offset the centrifugal inertial offset trend caused by the belt turning in advance, avoid the problem of uneven local friction and stress accumulation caused by the belt being statically attached to a single position for a long time, prevent the belt from running off track in advance, and ensure that the belt is always in a dynamically balanced centered running state.

[0042] S3. When the belt offset is detected to exceed the ±0.1mm reference range, and a lateral offset occurs inward or outward, the controller 207 identifies the direction and magnitude of the belt offset. Based on the offset linear matching control strategy, it adjusts the magnetic field strength and phase of the corresponding area of ​​the electromagnetic rail 205. The larger the offset, the synchronous linear increase of the magnetic field output power on the corresponding side, specifically increasing the magnetic force output on the offset side, driving the A group plate 2041 and the B group plate 2042 to make corresponding reverse sliding movements according to the offset direction, generating a lateral reset thrust opposite to the belt offset direction. For slight offsets of 0.1mm to 2mm, a low-speed fine-tuning mode is used; for larger offsets of 2mm to 5mm, a speed-up correction mode is used. By adjusting the magnetic force in stages to adapt to different offset amplitudes, the belt offset posture is gradually and smoothly corrected, avoiding belt shaking, sudden tension changes, and tipping of the packaging materials above caused by instantaneous strong correction, and smoothly correcting the offset belt to the ±0.1mm standard center position.

[0043] S4. When the offset detection device detects that the belt offset has fallen back to the preset standard centering error range of ±0.1mm and the belt has been completely reset to the standard position, the controller 207 immediately adjusts the magnetic field parameters of the electromagnetic rail 205 to restore it to the normal constant output working state of 50Hz frequency and 24V voltage. The correction plate 204 returns to the normal low-speed reciprocating sliding mode of 2mm~5mm and continues to perform belt anti-offset pre-processing. The equipment continuously executes the above-mentioned high-frequency detection, signal analysis, dynamic graded correction, and normal stability maintenance process throughout the entire process, realizing the fully automatic and dynamic correction of the corner belt conveyor line 102, eliminating belt deviation, edge wear, jamming, stress concentration and other faults, improving belt service life, and ensuring long-term, high-load continuous and stable operation of the conveyor line.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A conveying device for plastic packaging containers used in food production, characterized in that, include: Two sets of linear belt conveyors (101) are configured as the feed line and the discharge line, respectively; An angle belt conveyor (102) is set at one end of the two sets of straight belt conveyors (101), connecting the feed line and the discharge line and forming a 180° turning conveying path; A transition conveyor line (103) is provided at the junction of the straight belt conveyor line (101) and the corner belt conveyor line (102); The corner belt conveyor (102) is equipped with a correction mechanism, which includes: A support plate (201) is installed on the corner belt conveyor line (102); The slide rail (202) is mounted on the support plate (201); The slider (203) is slidably connected to the slide rail (202); A correction plate (204) is installed on top of the slider (203); An electromagnetic rail (205) is mounted on the support plate (201); A permanent magnet array (206) is disposed at the bottom of the correction plate (204); An offset detection element is installed on the corner belt conveyor (102); The controller (207) is installed on the corner belt conveyor (102). After receiving the offset signal transmitted by the offset detection device, the controller (207) controls the electromagnetic rail (205) to generate an alternating magnetic field. The alternating magnetic field cooperates with the magnetic field of the permanent magnet array (206) to drive the correction plate (204) to slide along the slide rail (202) with the slider (203), and generate a reverse relative motion with the belt of the corner belt conveyor (102).

2. The conveying device for plastic packaging containers used in food production according to claim 1, characterized in that: The support plate (201) is provided with a bearing plate (208), and the bearing plate (208) has multiple sets of first limiting grooves (209) and multiple sets of second limiting grooves (211). The first limiting grooves (209) and the second limiting grooves (211) are alternately distributed on the bearing plate (208). The opening of the first limiting groove (209) faces the belt side of the corner belt conveyor (102), and the opening direction of the second limiting groove (211) is opposite to that of the first limiting groove (209). The first limiting groove (209) and the second limiting groove (211) are used to limit the movement range of the correction plate (204); The support plate (201) is provided with multiple sets of reset components (212) for resetting the slider (203).

3. The conveying device for plastic packaging containers used in food production according to claim 2, characterized in that: The bearing plate (208) is provided with multiple sets of sliding grooves (213), and a roller frame (214) is provided in the sliding groove (213). A sliding belt (215) is sleeved on the roller frame (214). The sliding groove (213) is located between the first limiting groove (209) and the second limiting groove (211), and the top of the sliding belt (215) and the correction plate (204) are both provided with damping pads.

4. The conveying device for plastic packaging containers used in food production according to claim 3, characterized in that: The permanent magnet array (206) consists of multiple sets of permanent magnets arranged alternately with N and S poles along the length of the slide rail (202) to form an alternating static magnetic field; When the electromagnetic rail (205) is energized, the electromagnetic rail (205) generates an alternating NS magnetic field, and the alternating static magnetic field and the alternating NS magnetic field couple to form a horizontal bidirectional thrust.

5. The conveying device for plastic packaging containers used in food production according to claim 4, characterized in that: The correction plate (204) is divided into group A plate (2041) and group B plate (2042), and the group A plate (2041) and the group B plate (2042) are arranged alternately along the conveying direction; The permanent magnet array (206) on the A group plate (2041) and the B group plate (2042) have opposite magnetic pole arrangements. The electromagnetic rail (205) synchronously outputs a reverse alternating magnetic field, driving the adjacent A group plate (2041) and B group plate (2042) to slide back and forth in opposite directions along the slide rail (202).

6. The conveying device for plastic packaging containers used in food production according to claim 1, characterized in that, The offset detection components are in multiple sets, evenly distributed along the circumference of the corner belt conveyor (102), and the offset detection components include: The base (301) is installed on the corner belt conveyor (102); Mounting cylinder (302) is mounted on the base (301); The detection rod (303) is inserted into the mounting cylinder (302); A roller (304) is installed on the end of the detection rod (303) away from the mounting cylinder (302), and one end is in contact with the belt of the corner belt conveyor (102); A reset spring (305) is sleeved on the detection rod (303) and is used to reset the detection rod (303).

7. The conveying device for plastic packaging containers used in food production according to claim 6, characterized in that, The offset detection component also includes: A pressure detection membrane (306) is wrapped around the roller (304); A sliding plate (307) is installed on the end of the detection rod (303) away from the roller (304) and is slidably connected to the mounting cylinder (302); A magnetic ring (308) is mounted on the sliding plate (307); A magnetic field detector (309) is installed at the end of the mounting cylinder (302) away from the corner belt conveyor (102), with the detection end of the magnetic field detector (309) facing the magnetic ring (308).

8. The conveying device for plastic packaging containers used in food production according to claim 7, characterized in that: The transition conveyor line (103) includes a frame (401), a turntable (402), and a connecting shaft (403). The frame (401) is mounted on the linear belt conveyor (101), the connecting shaft (403) passes through the frame (401), the top of the frame (401) is provided with a drive motor (404), the drive motor (404) is connected to the connecting shaft (403) for transmission, the turntable (402) is sleeved on the connecting shaft (403), and the turntable (402) has multiple sets of grooves (405) for holding packaging containers.

9. A conveying device for plastic packaging containers used in food production according to claim 8, characterized in that: The transition conveyor line (103) also includes a base (406) and balls (407). The base (406) is mounted on the frame (401), the frame (401) is provided with a limiting plate (408), and the ball bearing (407) is embedded in the base (406).

10. A conveying device for plastic packaging containers used in food production according to claim 1, characterized in that, The control method of the controller (207) is as follows: S1. When the equipment is running normally, the offset detection component contacts the belt of the corner belt conveyor (102), continuously collects the lateral offset of the belt, and transmits the detection signal to the controller (207). S2. The controller (207) analyzes and judges the received offset signal. When the belt is detected to be in the center state, the controller (207) controls the electromagnetic rail (205) to output an alternating magnetic field and drive the correction plate (204) to slide back and forth at low speed. S3. When a lateral shift of the belt is detected, the controller (207) adjusts the magnetic field strength and phase of the electromagnetic rail (205), increases the magnetic force output on the corresponding side, drives the correction plate (204) to generate a lateral reset force, and gradually corrects the belt to the center position. S4. After the belt is reset to the standard position, the controller (207) controls the electromagnetic rail (205) to resume normal working state and repeatedly execute the above detection and correction process.

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