Door cover system for loading and unloading of logistic containers

Abstract

This invention discloses a door cover system for loading and unloading cargo in a logistics container, belonging to the field of design and manufacturing technology for containerized logistics transportation equipment. It provides a door cover system for loading and unloading cargo in a logistics container with high loading and unloading efficiency, effectively reducing or even avoiding cargo spillage. The door cover system includes a container body, a manhole cover, a position confirmation component, an automatic opening and closing sealing component, and a central control component. The position confirmation component is arranged on the wall of the container body. The automatic opening and closing sealing component and the position confirmation component are electrically connected to the central control component. The container body, with the cooperation of an external sensing component, is positioned by the position confirmation component and sends a positioning signal to the central control component. The manhole cover of the container body, after being positioned and / or after loading and unloading is completed, opens or closes and seals the loading and unloading manhole under the control of a switch control signal from the central control component via the automatic opening and closing sealing component.

Description

Technical Field

[0001] This invention relates to a door cover system, and more particularly to a door cover system for loading and unloading cargo in a logistics container, belonging to the field of design and manufacturing technology of container-type logistics transportation equipment. Background Technology

[0002] Logistics modular containers, due to their convenient loading and unloading and large transport capacity, have become the main transport carrier for warehousing and allocation. However, existing logistics modular containers still have several technical shortcomings in some loading and unloading operations: First, there is no precise contact positioning device when the container docks at the loading and unloading port, relying solely on manual visual judgment of position, which easily leads to docking deviations, resulting in material spillage during loading and unloading, and damage to the loading and unloading equipment from collisions with the container; Second, the opening and closing of the container's manhole covers is mostly done manually with bolt sealing, relying entirely on manual operation, which is not only labor-intensive, but also... The opening and closing efficiency is low, the auxiliary operation time for single box loading and unloading is long, and it cannot be linked with the automated conveyor belt / grain inlet, which restricts the overall loading and unloading efficiency; third, the sealing after the door is closed is mostly a manual bolt sealing structure, which has uneven sealing force and is prone to moisture and deterioration during transportation, resulting in material loss; fourth, the existing few automated door structures mostly use a single drive method without a dedicated hydraulic sealing and locking mechanism, resulting in poor sealing reliability, and they are not linked with loading and unloading equipment, resulting in a high rate of misoperation and inability to adapt to actual working conditions such as outdoor operations. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a door cover system for loading and unloading cargo in logistics container boxes that has high loading and unloading efficiency and can effectively reduce or even avoid cargo spillage.

[0004] The technical solution adopted to solve the above-mentioned technical problems is: a door cover system for loading and unloading cargo in a logistics container, including a container body and a manhole cover. At least one loading / unloading manhole is provided on the top surface of the container body. The loading / unloading manhole is opened or closed through the manhole cover. The door cover system further includes a position confirmation component, an automatic door opening and closing sealing component, and a central control component. The position confirmation component is arranged on the wall of the container body in accordance with the position of the external sensing component requiring position confirmation. The automatic door opening and closing sealing component is electrically connected to the central control component. The connection and position confirmation component is electrically connected to the central control component with the cooperation of the external sensing component. The manhole cover is arranged on the container body in accordance with the position of the loading and unloading manhole through the automatic opening and closing sealing component. The container body is parked in place with the cooperation of the external sensing component through the position confirmation component and sends a positioning signal to the central control component. The manhole cover of the container body, after being parked in place and / or after loading and unloading is completed, opens or closes the loading and unloading manhole and presses it tightly sealed under the control of the switch control signal sent by the central control component through the automatic opening and closing sealing component.

[0005] Furthermore, the door cover system also includes a loading and unloading sensor triggering component. The loading and unloading sensor triggering component, which is arranged on the top of the container body and is adapted to the position of the manhole door cover, is electrically connected to the central control component. Information on the material conveying port moving to the corresponding position of the loading and unloading manhole is obtained by the loading and unloading sensor triggering component and transmitted to the central control component to trigger the automatic opening and closing sealing component of the door cover to open or close the manhole door cover.

[0006] The preferred embodiment of the above scheme is that the loading and unloading sensing triggering component includes a control module, a limit sensor, a sensor transmission line, and a sensor mounting base. The limit sensor is arranged on the top of the container body through the sensor mounting base in accordance with the position of the manhole cover. An electrical signal transmitter group is arranged on the control module. The limit sensor is connected to the control module through the sensor transmission line. The signal information of the material conveying port moving to the corresponding position of the loading and unloading manhole sensed by the limit sensor is transmitted to the central control component through the electrical signal emitted by the electrical signal transmitter group.

[0007] Furthermore, the position confirmation component includes a telescopic probe and a reset buffer spring, and the external sensor component consists of a limit sensor. The telescopic probe is arranged at the bottom of the side wall of the container via the reset buffer spring, and the limit sensor is arranged on the external base in accordance with the position of the telescopic probe as it moves into place through the container. The moved container is limited and sends an electrical signal through the contact between the telescopic probe and the limit sensor. The electrical signal sent by the limit sensor is connected to the central control component.

[0008] The preferred embodiment of the above scheme is that the automatic opening and closing sealing assembly of the manhole cover includes a sealing element group, a manhole cover switch element group, and a locking and fastening element group. The sealing element group is arranged on the manhole cover in a circumferential position corresponding to the edge of the loading and unloading manhole opening. The manhole cover is hinged to the top of the container body in a position corresponding to the loading and unloading manhole. The manhole cover switch element group is connected to the hinge shaft. The manhole cover, which is closed by the drive of the manhole cover switch element group, closes the gap between the sealing element group and the edge of the loading and unloading manhole opening through the locking and fastening element group. The manhole cover switch element group and the locking and fastening element group are respectively electrically connected to the central control component.

[0009] Furthermore, the door cover switch assembly includes a door cover switch drive motor and a bearing linkage mechanism. The door cover switch drive motor is equipped with a control component and an electrical signal transmitter and receiver. The power output end of the bearing linkage mechanism is connected to the hinge shaft, and the power input end of the bearing linkage mechanism is connected to the power output end of the door cover switch drive motor. The door cover switch drive motor is electrically connected to the central control component through the electrical signal transmitter and receiver. The start and stop of the door cover switch drive motor are controlled by the control component in coordination with the corresponding signals received and transmitted by the electrical signal transmitter and receiver.

[0010] The preferred embodiment of the above scheme is that the locking and fastening assembly consists of a hydraulic locking and fastening system, which is electrically connected to the central control component.

[0011] Furthermore, the hydraulic locking and fastening system includes a hydraulic pump, hydraulic cylinders, hydraulic connecting pipelines, and pressure fittings. At least three sets of hydraulic cylinders are arranged circumferentially to correspond to the position of the manhole cover. At least one pressure fitting is arranged on the power output end of each set of hydraulic cylinders. Each set of hydraulic cylinders is connected to the hydraulic pump through hydraulic connecting pipelines. The hydraulic pump is also equipped with control components and electrical signal transmitters and receivers. The hydraulic pump is electrically connected to the central control component through the electrical signal transmitters and receivers. The opening, holding, and closing of the hydraulic pump are controlled by the control components in coordination with the corresponding signals received and transmitted by the electrical signal transmitters and receivers.

[0012] The preferred embodiment of the above scheme is that an orifice sealing ring is provided at the edge of the loading and unloading manhole along the circumferential direction, and the sealing component assembly is a polyurethane dustproof sealing ring arranged on the manhole cover along the circumferential direction in accordance with the position of the orifice sealing ring.

[0013] Furthermore, the central control component consists of a programmable computer or a set of PLC programmable modules. The position confirmation component, the automatic door opening and closing sealing component, and the electrical signal transmitter group are respectively connected to the programmable computer or PLC programmable modules via electrical signals. An audible and visual alarm is also installed on the central control component.

[0014] The beneficial effects of this invention are as follows: The technical solution provided in this application is based on existing container bodies and manhole covers, combined with the structural feature that at least one loading and unloading manhole is provided on the top surface of the container body, and the loading and unloading manhole is opened or closed through the manhole cover. A door cover system including a position confirmation component, an automatic door opening and closing sealing component, and a central control component is set up. Then, the position confirmation component is arranged on the wall of the container body in accordance with the position of the external sensing component that needs to be confirmed. The automatic door opening and closing sealing component is electrically connected to the central control component, so that the position... The system confirms that the manhole cover, in cooperation with the external sensing components, is electrically connected to the central control components, and that the manhole cover is positioned on the container body according to the loading / unloading manhole location via the automatic opening and closing sealing components. The container body is positioned and sends a positioning signal to the central control components via the position confirmation components in cooperation with the external sensing components. Finally, during loading and unloading, the manhole cover of the container body, which is positioned and / or has completed loading and unloading, opens or closes the loading / unloading manhole and seals it tightly via the automatic opening and closing sealing components under the control of the switch control signal issued by the central control components. This solves the technical problems in existing technologies where the docking position of the container needs to be manually confirmed, and the opening and closing of manhole covers before and after loading and unloading needs to be done manually. With the above-mentioned technical solution of this application, both the confirmation of the docking position of the container and the opening and closing of manhole covers before and after loading and unloading are completed automatically by the corresponding components. This not only improves the accuracy of alignment, but also makes the specific operation of opening and closing manhole covers quick and accurate, achieving the goal of significantly improving loading and unloading efficiency and effectively reducing or even avoiding cargo spillage. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the door cover system for loading and unloading cargo in a logistics container according to the present invention, taken from one direction. Figure 2 This is a three-dimensional structural diagram of the door cover system for loading and unloading cargo in a logistics container according to the present invention from another direction; Figure 3 Main view; Figure 4 This is a three-dimensional structural diagram of the manhole cover of the door cover system for loading and unloading cargo in a logistics container, as described in this invention, showing how the manhole cover opens and closes via an automatic door cover opening and closing sealing assembly.

[0016] The components in the diagram are labeled as follows: 1. Container body; 2. Manhole cover; 3. Loading / unloading manhole; 4. Material conveying port; 5. Control module; 6. Limit sensor; 7. Sensor transmission line; 8. Sensor mounting base; 9. Telescopic probe; 10. Reset buffer spring; 11. Limit sensor; 12. Door cover switch drive motor; 13. Bearing linkage mechanism; 14. Hinge shaft; 15. Hydraulic pump; 16. Hydraulic cylinder; 17. Hydraulic connection pipeline; 18. Press fitting; 19. Orifice sealing ring; 20. Polyurethane dustproof sealing ring. Detailed Implementation

[0017] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4The diagram illustrates a door cover system for loading and unloading cargo in a logistics container, providing high loading and unloading efficiency and effectively reducing or even preventing cargo spillage. The door cover system includes a container body 1 and a manhole cover 2. At least one loading / unloading manhole 3 is provided on the top surface of the container body 1. The loading / unloading manhole 3 is opened or closed through the manhole cover 2. The door cover system also includes a position confirmation component, an automatic door opening and closing sealing component, and a central control component. The position confirmation component is arranged on the wall of the container body 1 in accordance with the position of the external sensing component requiring position confirmation. The automatic door opening and closing sealing component is electrically connected to the central control component. The position confirmation component is located on the wall of the external sensing component. With the cooperation of the components, the manhole cover 2 is electrically connected to the central control component. The manhole cover 2 is arranged on the container body 1 in accordance with the position of the loading and unloading manhole 3 through the automatic opening and closing sealing component. The container body 1 is parked in place with the cooperation of the external sensing component through the position confirmation component and sends a positioning signal to the central control component. The manhole cover 2 of the container body 1, which is parked in place and / or has completed loading and unloading, opens or closes the loading and unloading manhole 3 and presses it to seal under the control of the switch control signal sent by the central control component through the automatic opening and closing sealing component. The technical solution provided in this application is based on existing modular container bodies and manhole covers. It incorporates the structural feature of having at least one loading / unloading manhole on the top surface of the modular container body, which opens and closes via a manhole cover. A door cover system is implemented, including a position confirmation component, an automatic door opening / closing and sealing component, and a central control component. The position confirmation component is then positioned on the wall of the modular container body in accordance with the location of the external sensing component requiring position confirmation. The automatic door opening / closing and sealing component is electrically connected to the central control component, enabling the position confirmation component to... With the cooperation of external sensing components, the system is electrically connected to the central control component. The manhole cover is arranged on the container body to adapt to the position of the loading and unloading manhole through the automatic opening and closing sealing component. The container body is positioned in place with the cooperation of the external sensing components through the position confirmation component and sends a positioning signal to the central control component. Finally, during loading and unloading, the manhole cover of the container body, which is in place and / or after loading and unloading is completed, opens or closes the loading and unloading manhole and seals it under the control of the switch control signal sent by the central control component through the automatic opening and closing sealing component. This solves the technical problems in existing technologies where the docking position of the container needs to be manually confirmed, and the opening and closing of manhole covers before and after loading and unloading needs to be done manually. With the above-mentioned technical solution of this application, both the confirmation of the docking position of the container and the opening and closing of manhole covers before and after loading and unloading are completed automatically by the corresponding components. This not only improves the accuracy of alignment, but also makes the specific operation of opening and closing manhole covers quick and accurate, achieving the goal of significantly improving loading and unloading efficiency and effectively reducing or even avoiding cargo spillage.In light of the actual loading and unloading situation, and to ensure accurate alignment between the unloading outlet and the loading / unloading manhole, the door cover system of this application also includes a loading / unloading sensor triggering component. The loading / unloading sensor triggering component, which is arranged on the top of the container body and is adapted to the position of the manhole door cover 2, is electrically connected to the central control component. Information on the material inlet 4 moving to the corresponding position of the loading / unloading manhole 3 is acquired by the loading / unloading sensor triggering component and transmitted to the central control component to trigger the automatic opening and closing sealing component of the door cover to open or close the manhole door cover 2, thereby achieving automatic alignment of the material inlet 4 after automatically confirming the parking position and opening the manhole door cover. At this time, the loading and unloading sensing triggering component includes a control module 5, a limit sensor 6, a sensor transmission line 7, and a sensor mounting base 8. The limit sensor 6 is arranged on the top of the container body 1 through the sensor mounting base 8, which is adapted to the position of the manhole cover 2. An electrical signal transmitter group is arranged on the control module 5. The limit sensor 6 is connected to the control module 5 through the sensor transmission line 7. The signal information of the material conveying port 4 moving to the corresponding position of the loading and unloading manhole 3 sensed by the limit sensor 6 is transmitted to the central control component through the electrical signal emitted by the electrical signal transmitter group.

[0018] Accordingly, in order to maximize the automation level of this application and minimize material leakage while simplifying the structure of each improved component, and to use existing parts as much as possible to reduce the equipment and manufacturing of specialized parts, the position confirmation component of this application includes a telescopic probe 9 and a reset buffer spring 10. The external sensor component consists of a limit sensor 11. The telescopic probe 9 is arranged at the bottom of the side wall of the container body via the reset buffer spring 10. The limit sensor 11 is arranged on the external base in accordance with the position of the telescopic probe 9 as it moves into place through the container body 1. The moved container body 1 is limited and sends an electrical signal through the contact between the telescopic probe 9 and the limit sensor 11. The electrical signal sent by the limit sensor 11 is connected to the central control component. The automatic opening and closing sealing assembly of the door cover in this application includes a sealing element group, a door cover switch element group, and a locking and fastening element group. The sealing element group is arranged on the manhole door cover 2 in a circumferential position corresponding to the edge of the loading and unloading manhole opening. The manhole door cover 2 is hinged to the top of the container body 1 in a position corresponding to the loading and unloading manhole 3. The door cover switch element group is connected to the hinge shaft 14. The manhole door cover 2, which is closed under the drive of the door cover switch element group, closes the gap between the sealing element group and the edge of the loading and unloading manhole opening through the locking and fastening element group. The door cover switch element group and the locking and fastening element group are respectively electrically connected to the central control component.

[0019] More specifically, the door cover switch assembly of this application includes a door cover switch drive motor 12 and a bearing linkage mechanism 13. The door cover switch drive motor 12 is equipped with a control component and an electrical signal transmitter and receiver. The power output end of the bearing linkage mechanism 13 is connected to a hinge shaft 14, and the power input end of the bearing linkage mechanism 13 is connected to the power output end of the door cover switch drive motor 12. The door cover switch drive motor 12 is electrically connected to the central control component via the electrical signal transmitter and receiver. The start and stop of the door cover switch drive motor 12 are controlled by the control component in coordination with the corresponding signals received and transmitted by the electrical signal transmitter and receiver. The locking and fastening assembly of this application consists of a hydraulic locking and fastening system, which is electrically connected to the central control component. At this point, the preferred structure is that the hydraulic locking and fastening system includes a hydraulic pump 15, a hydraulic cylinder 16, a hydraulic connection pipeline 17, and a pressure connector 18. At least three sets of hydraulic cylinders 16 are arranged circumferentially to correspond to the position of the manhole cover 2. At least one pressure connector 18 is arranged on the power output end of each set of hydraulic cylinders 16. Each set of hydraulic cylinders 16 is connected to the hydraulic pump 15 through the hydraulic connection pipeline 17. The hydraulic pump 15 is also equipped with a control component and an electrical signal transmitter and receiver. The hydraulic pump 15 is electrically connected to the central control component through the electrical signal transmitter and receiver. The opening, holding, and closing of the hydraulic pump 15 are controlled by the control component in coordination with the corresponding signals received and transmitted by the electrical signal transmitter and receiver.

[0020] In light of the cargo being transported, and to improve the sealing effect, this application provides a circumferential sealing ring 19 at the edge of the loading / unloading manhole 3. The sealing assembly consists of a polyurethane dustproof sealing ring 20 arranged on the manhole cover 2, circumferentially aligned with the position of the sealing ring 19. Correspondingly, the central control component of this application comprises a programmable computer or a set of PLC programmable modules. The position confirmation component, the automatic opening and closing sealing component, and the electrical signal transmitter assembly are respectively electrically connected to the programmable computer or PLC programmable modules. An audible and visual alarm is also provided on the central control component.

[0021] In summary, the technical solution provided in this application also has the following advantages: 1. This application achieves accurate determination of the docking of the container by setting contact-type position confirmation modules at the four corners of the container, with a position deviation of ≤5mm, effectively avoiding material spillage and equipment collision caused by docking deviation. It can also be equipped with dustproof and impact-resistant structures to adapt to the working conditions of grain depots. 2. This invention adopts a transmission structure of motor drive + linkage to realize the automatic opening and closing of the door cover. The opening and closing angle is ≥90° and the single opening and closing time is ≤10s. The opening and closing efficiency is much higher than that of manual operation. In addition, the motor has a self-locking function to prevent the door cover from closing by external force when it is open, thus improving the safety of operation. 3. This application achieves precise linkage between the opening and closing of the door cover and the conveyor belt / grain inlet through the loading and unloading sensor linkage module, so as to "open the door when the loading and unloading equipment is in place and close the door when it is lifted", and takes the container position confirmation signal as the premise of action, fundamentally avoiding equipment misoperation, realizing full automation, eliminating the need for manual intervention, and reducing labor intensity. 4. This application sets up a dedicated hydraulic cylinder sealing and locking module, which does not participate in the opening and closing of the door cover, but only completes the locking and sealing after the door cover is closed. The hydraulic cylinder adopts a multi-layer composite sealing structure, which effectively prevents the leakage and moisture problems during material transportation. The material loss rate can be reduced to below 0.5%. At the same time, the seals are wear-resistant and weather-resistant, extending the service life of the equipment. 5. This application uses a PLC control module as the core to realize the series linkage of each module. It is equipped with fault alarm, emergency stop and human-machine interaction functions, and has high operational stability. Moreover, the overall structure adopts a modular design, which is compatible with most container houses and logistics boxes, and can be seamlessly connected with the existing loading and unloading equipment of grain depots.

[0022] The technical solution of this application will be further described below through specific embodiments: The core design of this invention addresses the technical shortcomings of existing logistics container loading and unloading operations, such as inaccurate positioning, low automation of door opening and closing, poor sealing, and lack of linkage with loading and unloading equipment. It provides an automated loading and unloading structure for logistics containers, along with an automated door opening and closing sealing structure. This structure uses contact sensors to achieve precise positioning of the logistics container at its docking point, utilizes a motor drive to automate door opening and closing, and combines sensor-based linkage control with the conveyor belt / grain inlet to achieve precise triggering of the opening and closing action and loading / unloading. A hydraulic cylinder completes the sealing and locking after the door is closed. The overall structure achieves full automation of the entire loading and unloading process for logistics containers, from "positioning - door opening and closing - material loading and unloading - sealing," eliminating the need for manual intervention, improving loading and unloading efficiency, and reducing material loss.

[0023] This structure includes a logistics container body position confirmation module, an automatic door opening and closing module, a loading and unloading sensor linkage module, a hydraulic cylinder sealing and locking module, and a PLC control module. The PLC control module is electrically connected to the logistics container body position confirmation module, the automatic door opening and closing module, the loading and unloading sensor linkage module, and the hydraulic cylinder sealing and locking module to realize the linkage control of each module.

[0024] 1. The container position confirmation module is installed at the preset positions of the four standard corner pieces of the container corresponding to the loading and unloading port. It is a contact sensing structure used to detect whether the container has stopped at the designated loading and unloading position and send a position confirmation / deviation signal to the PLC control module. 2. The automatic door opening and closing module is installed at the manhole door of the shelter. It uses a motor as the core drive and realizes the automatic flipping and opening and closing of the door through a transmission structure. It only starts to operate after receiving the opening and closing signal from the PLC control module. 3. The loading and unloading sensing linkage module is installed at the end of the conveyor belt / grain inlet. It is a contact sensing structure used to detect whether the conveyor belt / grain inlet has been lowered to the loading and unloading position and to send a door opening / closing trigger signal to the PLC control module. 4. The hydraulic cylinder sealing and locking module is symmetrically installed at the contact point between the manhole cover and the flange surface of the shelter. It does not participate in the opening and closing action of the cover. It is only triggered by the PLC control module after the cover is closed in place to complete the locking and sealing of the cover. 5. The PLC control module is the control core of the overall structure, integrating fault alarm and action locking functions. It only responds to the trigger signal of the loading and unloading induction linkage module after receiving the cabin position confirmation signal to realize the opening and closing control of the door cover. After the door cover is closed in place, the hydraulic cylinder sealing and locking module is automatically triggered to start. The specific technical solution is as follows. The container position confirmation module includes a wear-resistant telescopic probe, a reset buffer spring, and a limit sensor. The end of the telescopic probe has an arc-shaped structure that matches the groove of the container's corner fittings, and its telescopic stroke is 10-20mm. The reset buffer spring is sleeved on the outside of the telescopic probe, and the limit sensor is located at the tail of the telescopic probe. When the container docks to the designated position, the four corner fittings simultaneously press against the telescopic probe, compressing the reset buffer spring and triggering the limit sensor, which sends a position confirmation signal to the PLC control module. If any telescopic probe is not triggered, the limit sensor sends a position deviation signal to the PLC control module, which immediately issues an audible and visual alarm and locks all subsequent actions.

[0025] The automatic door opening and closing module includes a DC geared motor, a bearing linkage mechanism, and a limit switch. The DC geared motor is a 380V industrial-grade outdoor motor with a rated power of 0.75-1.5kW, a rated torque of 20-50N·m, a reduction ratio of 1:50-1:100, and a forward and reverse self-locking function. One end of the bearing linkage mechanism is fixed to the geared motor, and the other end is fixedly connected to the manhole door of the shelter. The limit switch is located at the door's final position to limit the opening and closing angle of the door to ≥90°, and sends a door arrival signal to the PLC control module to stop rotation.

[0026] The loading / unloading sensing and linkage module is an IP67 protection-rated contact proximity switch with a detection distance of 5-10cm, installed at the end where the conveyor belt / grain inlet connects to the container. When the conveyor belt / grain inlet is lowered to the loading / unloading position and contacts the container, the proximity switch is triggered. Feeding can begin once the conveyor belt / grain inlet has come to a complete stop. Once loading / unloading is complete, the conveyor belt / grain inlet is raised, the contact is released, and the proximity switch sends a door closing signal to the PLC control module. (Previously, the conveyor belt was lowered first, then the door was opened; now, the door is opened first, then the conveyor belt is lowered.) The hydraulic cylinder sealing and locking module includes a single-acting piston hydraulic cylinder, a hydraulic pump station, and a sealing polyurethane ring. Two to four sets of the single-acting piston hydraulic cylinder are symmetrically installed, with a cylinder diameter of 40-60mm, a rod diameter of 20-30mm, a stroke of 50-80mm, a rated working pressure of 4-6MPa, and a self-locking function. The hydraulic pump station is connected to the hydraulic cylinder via hydraulic oil pipes, providing pressure to the hydraulic cylinder. The sealing polyurethane ring is arranged inside the door cover and is compressed by 3-5mm when pressed down by the hydraulic cylinder.

[0027] The PLC control module is also equipped with an emergency stop button and a touch screen human-machine interface. The emergency stop button can terminate all actions immediately, and the touch screen human-machine interface can adjust the door opening and closing speed, the hydraulic cylinder locking pressure, display the working status of each module in real time, and record the equipment operation data.

[0028] Example 1 There are 4 sets of modular container location confirmation modules, which are installed at the preset positions of the four standard corner pieces of the modular container at the loading and unloading port of the grain depot. Each set includes a wear-resistant telescopic probe, a reset buffer spring, and a limit sensor. The telescopic probe has a stroke of 15mm and an arc-shaped end that matches the groove of the modular container corner piece.

[0029] The automatic door opening and closing module is installed on the side of the manhole door of the container. It includes a DC geared motor (rated power 1.1kW, rated torque 35N·m, reduction ratio 1:100), a bearing linkage mechanism and a limit switch. The bearing linkage mechanism is fixed to the motor output end, and the limit switch limits the door opening and closing angle to 90~180° to ensure unobstructed grain loading and unloading passage.

[0030] The loading and unloading sensor linkage module is an IP67 protection-rated contact proximity sensor switch, installed at the end of the grain conveying port, with a detection distance of 8cm. When the grain conveying port is lowered to contact the container, the sensor switch is triggered, sending a grain conveying signal to continue conveying grain; when the grain conveying port is raised, the trigger is deactivated, and a door cover closing signal is sent.

[0031] The hydraulic cylinder sealing and locking module includes two sets of single-acting piston hydraulic cylinders (cylinder diameter 50mm, rod diameter 25mm, stroke 60mm, rated working pressure 5MPa), a hydraulic pump station, and a polyurethane dustproof sealing ring. The hydraulic cylinders are symmetrically installed at the contact points between the manhole cover and the cabin flange.

[0032] The PLC control module uses a small industrial-grade PLC and is equipped with a 4.3-inch touch screen human-machine interface. It can adjust the opening and closing speed of the door cover and the locking pressure of the hydraulic cylinder, and display the working status of each module in real time. When the container position confirmation module sends a confirmation signal, it triggers the door cover opening and closing action. After the door cover is fully opened or closed, it issues a signal to trigger the material conveyor to lower and load the goods. When the door cover is fully closed, the PLC automatically triggers the hydraulic pump station to drive the hydraulic cylinder to extend and complete the door cover sealing and locking.

[0033] The working process of this embodiment is as follows: 1. The grain transport container enters the grain depot loading and unloading port and stops at the designated position. The four corner pieces simultaneously press against the telescopic probe, triggering the limit sensor and sending a position confirmation signal to the PLC control module. The audible and visual alarm emits a green indicator light. 2. After receiving the signal, the PLC drives the DC geared motor to rotate forward. The motor drives the bearing linkage mechanism, causing the manhole cover 4 to rotate upward by 90° to 180°. The limit switch is triggered, the motor stops, and the cover is opened to the correct position. 3. The grain depot's grain conveying port is lowered to the loading and unloading position that connects with the container, triggering the loading and unloading sensor linkage module to send a signal to the PLC; 4. Start the grain depot's grain conveying equipment, and load the grain into container 1 through the grain conveying port to complete the grain loading operation; 5. After the grain loading is completed, the grain depot control system drives the grain conveying port to lift, the loading and unloading sensor linkage module is de-triggered, and a door cover closing signal is sent to the PLC; 6. The PLC drives the DC geared motor to reverse, causing the manhole cover to close downwards. The limit switch is triggered, and the motor stops. 7. The PLC automatically triggers the hydraulic pump station, the hydraulic cylinder piston extends, and presses against the door cover sealing strip, so that the door cover fits tightly against the flange surface of the container, completing the sealing and locking. 8. After the grain loading and sealing operations are completed, the container departs from the loading and unloading port.

[0034] The environment variables and their descriptions for the PLC control module are as follows: (1) Variable description / / Input variables VAR_INPUT E_STOP: BOOL; / / Emergency stop button I:0.0 / 0 SENSOR_CORNER_1: BOOL; / / Corner sensor 1 I:0.0 / 1 SENSOR_CORNER_2: BOOL; / / Corner sensor 2 I:0.0 / 2 SENSOR_CORNER_3: BOOL; / / Corner sensor 3 I:0.0 / 3 SENSOR_CORNER_4: BOOL; / / Corner sensor 4 I:0.0 / 4 SENSOR_HOPPER_DOWN: BOOL; / / Trigger I:0.0 / 5 for feed port lowering. SENSOR_HOPPER_UP: BOOL; / / Trigger I:0.0 / 6 when the feed port rises. SW_LID_OPEN: BOOL; / / Limit switch I:0.0 / 7 for door cover fully open. SW_LID_CLOSE: BOOL; / / Door cover closing limit switch I:0.0 / 8 SENSOR_CYL_OK: BOOL; / / Hydraulic cylinder position sensor I:0.0 / 9 SENSOR_VAN_LEAVE: BOOL; / / Container departure sensor I:0.0 / 10 END_VAR / / Output variables VAR_OUTPUT LIGHT_GREEN: BOOL; / / Green indicator light 0:0.0 / 0 LIGHT_RED: BOOL; / / Red alarm light 0:0.0 / 1 BUZZER: BOOL; / / Buzzer O:0.0 / 2 MOTOR_FWD: BOOL; / / Motor forward rotation O:0.0 / 3 MOTOR_REV: BOOL; / / Motor reverses direction O:0.0 / 4 PUMP_ON: BOOL; / / Hydraulic pump starts O:0.0 / 5 CYL_EXT: BOOL; / / Hydraulic cylinder extends 0:0.0 / 6 END_VAR / / Intermediate variables VAR STATE: INT := 0; / / State machine: 0=Standby, 1=Position detection, 2=Door open, 3=Loading / unloading, 4=Door closed, 5=Sealing and locking, 6=Operation completed, 7=Abnormal POS_OK: BOOL; / / Position OK flag TRIG_OK: BOOL; / / Dual signal verification passed TIMER_POS: TON; / / Position detection timeout timer TIMER_LID: TON; / / Door cover action timeout timer TIMER_CYL: TON; / / Hydraulic action timeout timer END_VAR (2) Main program execution logic / / Emergency stop priority handling IF E_STOP THEN / / Emergency stop trigger: Stop all output and enter an abnormal state. MOTOR_FWD := FALSE; MOTOR_REV := FALSE; PUMP_ON := FALSE; CYL_EXT := FALSE; LIGHT_GREEN := FALSE; LIGHT_RED := TRUE; BUZZER := TRUE; STATE := 7; RETURN; END_IF / / State Machine Main Logic CASE STATE OF 0: / / Standby mode LIGHT_RED := FALSE; BUZZER := FALSE; / / Check if all four corner sensors are triggered POS_OK := SENSOR_CORNER_1 AND SENSOR_CORNER_2 AND SENSOR_CORNER_3AND SENSOR_CORNER_4; IF POS_OK THEN LIGHT_GREEN := TRUE; / / Start the location detection timeout timer (5s) TIMER_POS(IN := TRUE, PT := T#5S); STATE := 1; END_IF 1: / / Location positioning and trigger verification TRIG_OK := POS_OK AND SENSOR_HOPPER_DOWN; IF TRIG_OK THEN TIMER_POS(IN := FALSE); / / Reset timer STATE := 2; ELSIF TIMER_POS.Q THEN / / Location detection timed out, triggering an exception LIGHT_RED := TRUE; BUZZER := TRUE; STATE := 7; END_IF 2: / / Door opens automatically MOTOR_FWD := TRUE; TIMER_LID(IN := TRUE, PT := T#10S); / / Door cover action timeout 10s IF SW_LID_OPEN THEN MOTOR_FWD := FALSE; TIMER_LID(IN := FALSE); STATE := 3; ELSIF TIMER_LID.Q THEN MOTOR_FWD := FALSE; LIGHT_RED := TRUE; BUZZER := TRUE; STATE := 7; END_IF 3: / / Material loading and unloading operations IF SENSOR_HOPPER_UP THEN STATE := 4; END_IF 4: / / Door closes automatically MOTOR_REV := TRUE; TIMER_LID(IN := TRUE, PT := T#10S); IF SW_LID_CLOSE THEN MOTOR_REV := FALSE; TIMER_LID(IN := FALSE); STATE := 5; ELSIF TIMER_LID.Q THEN MOTOR_REV := FALSE; LIGHT_RED := TRUE; BUZZER := TRUE; STATE := 7; END_IF 5: / / Hydraulic seal locking PUMP_ON := TRUE; CYL_EXT := TRUE; TIMER_CYL(IN := TRUE, PT := T#8S); / / Hydraulic action timeout 8s IF SENSOR_CYL_OK THEN PUMP_ON := FALSE; CYL_EXT := FALSE; TIMER_CYL(IN := FALSE); STATE := 6; ELSIF TIMER_CYL.Q THEN PUMP_ON := FALSE; CYL_EXT := FALSE; LIGHT_RED := TRUE; BUZZER := TRUE; STATE := 7; END_IF 6: / / Job completion and reset BUZZER := TRUE; LIGHT_GREEN := FALSE; IF SENSOR_VAN_LEAVE THEN BUZZER := FALSE; / / Reset all flags POS_OK := FALSE; TRIG_OK := FALSE; STATE := 0; END_IF 7: / / Abnormal state IF NOT E_STOP AND NOT TIMER_POS.Q AND NOT TIMER_LID.Q AND NOTTIMER_CYL.QTHEN / / Error cleared, return to standby LIGHT_RED := FALSE; BUZZER := FALSE; STATE := 0; END_IF END_CASE。

Claims

1. A door cover system for loading and unloading cargo in a logistics container, comprising a container body (1) and a manhole cover (2), wherein at least one loading and unloading manhole (3) is provided on the top surface of the container body (1), and the loading and unloading manhole (3) is opened or closed through the manhole cover (2), characterized in that: The door cover system also includes a position confirmation component, an automatic door cover opening and closing sealing component, and a central control component. The position confirmation component is arranged on the wall of the container (1) in accordance with the position of the external sensing component that needs to be confirmed. The automatic door cover opening and closing sealing component is electrically connected to the central control component. The position confirmation component is electrically connected to the central control component with the cooperation of the external sensing component. The manhole door cover (2) is arranged on the container (1) in accordance with the position of the loading and unloading manhole (3) through the automatic door cover opening and closing sealing component. The container (1) is parked in place with the cooperation of the external sensing component through the position confirmation component and sends a positioning signal to the central control component. The manhole door cover (2) of the container (1) after being parked in place and / or after loading and unloading is completed opens or closes the loading and unloading manhole (3) and presses it to seal under the control of the switch control signal sent by the central control component through the automatic door cover opening and closing sealing component.

2. The door cover system for loading and unloading cargo in a logistics container as described in claim 1, characterized in that: The door cover system also includes a loading and unloading induction triggering component. The loading and unloading induction triggering component, which is arranged on the top of the container body and is adapted to the position of the manhole door cover (2), is electrically connected to the central control component. The information that the material inlet (4) moves to the corresponding position of the loading and unloading manhole (3) is obtained by the loading and unloading induction triggering component and transmitted to the central control component to trigger the automatic opening and closing sealing component of the door cover to open or close the manhole door cover (2).

3. The door cover system for loading and unloading cargo in a logistics container as described in claim 2, characterized in that: The loading and unloading sensing triggering component includes a control module (5), a limit sensor (6), a sensor transmission line (7), and a sensor mounting base (8). The limit sensor (6) is arranged on the top of the container body (1) through the sensor mounting base (8) in accordance with the position of the manhole cover (2). An electrical signal transmitter group is arranged on the control module (5). The limit sensor (6) is connected to the control module (5) through the sensor transmission line (7). The signal information of the material inlet (4) moved to the corresponding position of the loading and unloading manhole (3) sensed by the limit sensor (6) is transmitted to the central control component through the electrical signal emitted by the electrical signal transmitter group.

4. The door cover system for loading and unloading cargo in a logistics container according to claim 1, 2, or 3, characterized in that: The position confirmation component includes a telescopic probe (9) and a reset buffer spring (10). The external sensor component consists of a limit sensor (11). The telescopic probe (9) is arranged at the bottom of the side wall of the container via the reset buffer spring (10). The limit sensor (11) is arranged on the external base in accordance with the position of the telescopic probe (9) that moves into place through the container (1). The container (1) that moves into place contacts the limit sensor (11) through the telescopic probe (9) and sends an electrical signal. The electrical signal sent by the limit sensor (11) is connected to the central control component.

5. The door cover system for loading and unloading cargo in a logistics container as described in claim 4, characterized in that: The automatic opening and closing sealing assembly of the door cover includes a sealing component group, a door cover switch component group, and a locking and fastening component group. The sealing component group is arranged on the manhole door cover (2) in a circumferential position corresponding to the edge of the loading and unloading manhole opening. The manhole door cover (2) is hinged to the top of the container body (1) in a position corresponding to the loading and unloading manhole (3). The door cover switch component group is connected to the hinge shaft (14). The manhole door cover (2) closed under the drive of the door cover switch component group closes the gap between the sealing component group and the edge of the loading and unloading manhole opening through the locking and fastening component group. The door cover switch component group and the locking and fastening component group are respectively electrically connected to the central control component.

6. The door cover system for loading and unloading cargo in a logistics container as described in claim 5, characterized in that: The door cover switch assembly includes a door cover switch drive motor (12) and a bearing linkage mechanism (13). The door cover switch drive motor (12) is equipped with a control component and an electrical signal transmitter and receiver. The power output end of the bearing linkage mechanism (13) is connected to the hinge shaft (14), and the power input end of the bearing linkage mechanism (13) is connected to the power output end of the door cover switch drive motor (12). The door cover switch drive motor (12) is electrically connected to the central control component through the electrical signal transmitter and receiver. The start and stop of the door cover switch drive motor (12) are controlled by the control component in coordination with the corresponding signals received and transmitted by the electrical signal transmitter and receiver.

7. The door cover system for loading and unloading cargo in a logistics container as described in claim 6, characterized in that: The locking and fastening assembly consists of a hydraulic locking and fastening system, which is electrically connected to the central control component.

8. The door cover system for loading and unloading cargo in a logistics container as described in claim 7, characterized in that: The hydraulic locking and fastening system includes a hydraulic pump (15), a hydraulic cylinder (16), a hydraulic connection pipeline (17), and a pressure connector (18). At least three sets of hydraulic cylinders (16) are arranged circumferentially to match the position of the manhole cover (2). At least one pressure connector (18) is arranged on the power output end of each set of hydraulic cylinders (16). Each set of hydraulic cylinders (16) is connected to the hydraulic pump (15) through the hydraulic connection pipeline (17). The hydraulic pump (15) is also equipped with a control component and an electrical signal transmitter and receiver. The hydraulic pump (15) is electrically connected to the central control component through the electrical signal transmitter and receiver. The opening, holding, and closing of the hydraulic pump (15) are controlled by the control component in coordination with the corresponding signals received and transmitted by the electrical signal transmitter and receiver.

9. The door cover system for loading and unloading cargo in a logistics container as described in claim 8, characterized in that: A sealing ring (19) is provided at the edge of the opening of the loading and unloading manhole (3) along the circumferential direction. The sealing assembly is a polyurethane dustproof sealing ring (20) arranged on the manhole cover (2) along the circumferential direction and adapted to the position of the sealing ring (19).

10. The door cover system for loading and unloading cargo in a logistics container according to claim 1, 2, or 3, characterized in that: The central control unit consists of a programmable computer or a set of PLC programmable modules. The position confirmation component, the automatic door opening and closing sealing component, and the electrical signal transmitter group are respectively connected to the programmable computer or PLC programmable modules by electrical signals. An audible and visual alarm is also installed on the central control unit.

Images