Unloading method for synthetic resin container

Abstract

Provided in the present invention is an unloading method for a synthetic resin container. The unloading method comprises: maintaining a synthetic resin container in a vertical position, opening unloading doors on a side wall of the synthetic resin container, and when a detection signal from a pressure sensor arranged at the bottom of the synthetic resin container meets a preset condition, controlling the synthetic resin container to start tilting around a long edge of a bottom wall; controlling the synthetic resin container to gradually tilt from the vertical position into a tilted position within a first preset duration; and once the synthetic resin container has reached the tilted position, controlling the synthetic resin container to move from the tilted position into the vertical position within a second preset duration. The technical solution of the present application effectively solves the problem of low unloading efficiency of synthetic resin containers in the related art.

Description

Unloading method of synthetic resin container

[0001] Related applications

[0002] This application claims priority to the Chinese patent application filed with the Patent Office of China on December 15, 2023, with application number CN202311738032.7 and invention name “Method for unloading synthetic resin container”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the technical field of synthetic resin container unloading, and in particular to a synthetic resin container unloading method. Background Art

[0004] With the promotion and implementation of the conversion of bulk cargo to container cargo, bulk granular cargo such as grain and chemical raw materials are gradually being stored, transported and loaded and unloaded in synthetic resin containers. During unloading, a hydraulic jacking mechanism is mainly used to flip the synthetic resin container for unloading. The cargo is discharged by relying on the dead weight of the bulk cargo.

[0005] In the related art, the unloading operation is performed manually by observing the angle indicator at one end of the synthetic resin container to control the extension length of the hydraulic cylinder and thus the flipping angle of the synthetic resin container. This unloading efficiency is not high, and because it relies on manual experience and judgment, it will lead to large differences in unloading time.

[0006] Summary of the Invention

[0007] The main purpose of the present invention is to provide a method for unloading a synthetic resin container to solve the problem of low unloading efficiency of synthetic resin containers in the related art.

[0008] To achieve the above-mentioned objectives, the present invention provides a method for unloading a synthetic resin container, comprising: maintaining the synthetic resin container in a vertical position, opening an unloading door on a side wall of the synthetic resin container, and controlling the synthetic resin container to begin tilting with the long side of the bottom wall as an axis when a detection signal from a pressure sensor provided at the bottom of the synthetic resin container meets a preset condition; controlling the synthetic resin container to gradually tilt from a vertical position and reach an inclined position within a first preset time period; and when the synthetic resin container reaches the inclined position, controlling the synthetic resin container to move from the inclined position to a vertical position within a second preset time period.

[0009] Furthermore, when a detection signal from a pressure sensor disposed at the bottom of the synthetic resin container satisfies a preset condition, the step of controlling the synthetic resin container to start tilting with the long side of the bottom wall as the axis includes: transmitting the detection signal detected by the pressure sensor to a controller, the detection signal corresponding to the real-time weight of the synthetic resin container; when a ratio of the real-time weight of the synthetic resin container to the total weight of the synthetic resin container satisfies a preset ratio, the controller controlling the jacking mechanism to operate so that the synthetic resin container starts tilting with the long side of the bottom wall as the axis; wherein the preset ratio is between 0.65 and 0.75.

[0010] Furthermore, when the detection signal of the pressure sensor provided at the bottom of the synthetic resin container does not meet the preset conditions and the time for which the synthetic resin container remains in the vertical position reaches a third preset time, the synthetic resin container is controlled to start tilting with the long side of the bottom wall as the axis.

[0011] Further, when the second preset time length is less than the first preset time length, the first preset time length is greater than the third preset time length.

[0012] Furthermore, when the ratio of the sum of the first preset time length and the second preset time length to the third preset time length is between 1.5 and 3.

[0013] Furthermore, when the sum of the first preset time length and the second preset time length is between 30 minutes and 50 minutes.

[0014] Furthermore, the step of controlling the synthetic resin container to gradually tilt from a vertical position and reach a tilted position within a first preset time period includes: when the ratio of the real-time weight of the synthetic resin container to the total weight of the synthetic resin container is greater than 0.55, the synthetic resin container tilts at a first speed; when the ratio of the real-time weight of the synthetic resin container to the total weight of the synthetic resin container is greater than or equal to 0.3 and less than or equal to 0.55, the synthetic resin container flips at a second speed; when the ratio of the real-time weight of the synthetic resin container to the total weight of the synthetic resin container is less than 0.3, the synthetic resin container flips at a third speed, wherein the first speed is less than the second speed, and the third speed is less than the second speed.

[0015] Further, when the first speed is greater than the third speed.

[0016] Furthermore, when the first speed, the second speed and the third speed are all between 0.75° / min and 1.25° / min.

[0017] Furthermore, when the synthetic resin container is in the tilted position, the angle between the bottom surface of the synthetic resin container and the horizontal plane is between 30° and 50°.

[0018] Using the technical solution of the present application, a synthetic resin container is maintained in a vertical position and its unloading door is opened. When the detection signal from a pressure sensor located at the bottom of the synthetic resin container meets a preset condition, the synthetic resin container is controlled to begin tilting about the long side of the bottom wall. The synthetic resin container is controlled to gradually tilt from the vertical position to the tilted position within a first preset time period. Once the synthetic resin container reaches the tilted position, the synthetic resin container is controlled to move from the tilted position to the vertical position within a second preset time period. With this arrangement, when unloading cargo, the unloading door is first opened and the synthetic resin container is unloaded while in the vertical position. Since the synthetic resin container is fully loaded with cargo, the cargo flows more rapidly in the vertical position. When the preset condition is met, the synthetic resin container is controlled to begin tilting. Since some cargo has already been unloaded in the vertical position, the weight of the synthetic resin container is reduced, making it easier to tilt. During the gradual tilting process, cargo continuously flows out of the unloading door at a relatively high rate. After reaching the tilted position, the synthetic resin container and the loading and unloading container are controlled to move from the tilted position to the vertical position within a second preset time period. During the above process, the remaining cargo in the synthetic resin container can be gradually unloaded, thereby enabling the cargo in the synthetic resin container to be completely unloaded, and such unloading efficiency is relatively high. Therefore, the technical solution of the present application effectively solves the problem of low unloading efficiency of synthetic resin containers in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] FIG1 is a schematic flow chart showing an embodiment of a method for unloading a synthetic resin container according to the present invention;

[0021] FIG2 shows a schematic diagram of a specific flow chart of step S10 of the method for unloading a synthetic resin container in FIG1 ;

[0022] FIG3 is a schematic perspective view of the synthetic resin container of FIG1 showing a method for unloading the synthetic resin container;

[0023] FIG. 4 is a schematic diagram showing a functional relationship of the method for unloading the synthetic resin container of FIG. 1 .

[0024] The above drawings include the following reference numerals: 1. synthetic resin container; 2. unloading door. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] As shown in FIG1 to FIG4 , in this embodiment, the method for unloading a synthetic resin container 1 includes:

[0027] Step S10: Maintaining the synthetic resin container 1 in a vertical position, opening the unloading door 2 on the side wall of the synthetic resin container 1, and controlling the synthetic resin container 1 to begin tilting about the long side of the bottom wall when a detection signal from a pressure sensor disposed at the bottom of the synthetic resin container 1 meets a preset condition;

[0028] Step S20: controlling the synthetic resin container 1 to gradually tilt from the vertical position to the tilted position within a first preset time period;

[0029] Step S30: When the synthetic resin container 1 reaches the tilted position, the synthetic resin container 1 is controlled to move from the tilted position to the vertical position within a second preset time period.

[0030] Using the technical solution of this embodiment, a synthetic resin container 1 is maintained in a vertical position while its unloading door 2 is opened. When the detection signal from a pressure sensor located at the bottom of the synthetic resin container 1 meets a preset condition, the synthetic resin container 1 is controlled to begin tilting about the long side of the bottom wall. The synthetic resin container 1 is controlled to gradually tilt from the vertical position to the tilted position within a first preset time period. Once the synthetic resin container 1 reaches the tilted position, the synthetic resin container 1 is controlled to move from the tilted position to the vertical position within a second preset time period. With this arrangement, when unloading cargo, the unloading door 2 is first opened, and the synthetic resin container 1 is unloaded while in the vertical position. Because the synthetic resin container 1 is fully loaded with cargo, the cargo flows more rapidly in the vertical position. When the preset condition is met, the synthetic resin container 1 is controlled to begin tilting. Since some cargo has already been unloaded in the vertical position, the weight of the synthetic resin container 1 is reduced, making it easier to tilt. During the gradual tilting process, cargo continuously flows out of the unloading door 2 at a relatively high rate. After reaching the tilted position, the synthetic resin container 1 and the loading and unloading device are controlled to move from the tilted position to the vertical position within a second preset time period. During this process, the remaining cargo in the synthetic resin container 1 can be gradually unloaded, thereby completely unloading the cargo in the synthetic resin container 1 with high unloading efficiency. Therefore, the technical solution of this embodiment effectively solves the problem of low unloading efficiency of synthetic resin containers 1 in the related art.

[0031] Specifically, in this embodiment, the second preset duration is 5 minutes.

[0032] It should be noted that: when the synthetic resin container 1 reaches the tilted position, the step of controlling the synthetic resin container 1 to move from the tilted position to the vertical position within the second preset time period includes two situations: the first situation is that when the synthetic resin container 1 reaches the tilted position, it stays for a certain period of time, and then controls the synthetic resin container 1 to move from the tilted position to the vertical position within the second preset time period; the second situation is that when the synthetic resin container 1 reaches the tilted position, it does not stay, and directly controls the synthetic resin container 1 to move from the tilted position to the vertical position within the second preset time period.

[0033] Step S10: When the detection signal of the pressure sensor provided at the bottom of the synthetic resin container 1 meets a preset condition, the step of controlling the synthetic resin container 1 to start tilting with the long side of the bottom wall as the axis includes:

[0034] Step S11: The detection signal detected by the pressure sensor is transmitted to the controller, and the detection signal corresponds to the real-time weight of the synthetic resin container 1;

[0035] Step S12: When the ratio of the real-time weight of the synthetic resin container 1 to the total weight of the synthetic resin container 1 meets a preset ratio, the controller controls the lifting mechanism to cause the synthetic resin container 1 to begin tilting about the long side of the bottom wall; the preset ratio is between 0.65 and 0.75. With this configuration, the synthetic resin container 1 is partially unloaded when in the vertical position, reducing its weight and making it easier to lift. Furthermore, when the preset ratio is between 0.75 and 0.65, the speed at which the cargo is unloaded from the synthetic resin container 1 in the vertical position decreases. Gradually tilting the synthetic resin container 1 at this point can increase the speed at which the cargo is unloaded, thereby improving unloading efficiency.

[0036] It should be noted that the total weight of the synthetic resin container 1 and the cargo is based on data measured by the pressure sensor when the unloading door 2 is not opened. Of course, the total weight of the synthetic resin container 1 and the cargo can also be set to a preset value.

[0037] When the detection signal from the pressure sensor located at the bottom of synthetic resin container 1 fails to meet preset conditions and the synthetic resin container 1 has been held in an upright position for a third preset time period, synthetic resin container 1 is controlled to begin tilting about the long side of the bottom wall. This configuration prevents inaccurate detection signals from the pressure sensor. Even if the pressure sensor is not functioning properly, synthetic resin container 1 can still begin to tilt after the third preset time period has expired, thereby ensuring accurate and efficient unloading.

[0038] The second preset time length is shorter than the first preset time length, and the first preset time length is longer than the third preset time length. The above setting can ensure the efficiency of unloading.

[0039] The ratio of the sum of the first preset time and the second preset time to the third preset time is between 1.5 and 3, and the sum of the first preset time and the second preset time is between 30 minutes and 50 minutes. The above setting can shorten the overall unloading time.

[0040] The step of gradually tilting the synthetic resin container 1 from a vertical position to a tilted position within a first preset time period includes: when the ratio of the real-time weight of the synthetic resin container 1 to the total weight of the synthetic resin container 1 is greater than 0.55, the synthetic resin container 1 tilts at a first speed; when the ratio of the real-time weight of the synthetic resin container 1 to the total weight of the synthetic resin container 1 is greater than or equal to 0.3 and less than or equal to 0.55, the synthetic resin container 1 flips at a second speed; and when the ratio of the real-time weight of the synthetic resin container 1 to the total weight of the synthetic resin container 1 is less than 0.3, the synthetic resin container 1 flips at a third speed, wherein the first speed is less than the second speed, and the third speed is less than the second speed. The first speed is greater than the third speed. This arrangement can further increase the speed of unloading. Specifically, through the above operation, the first speed is relatively slow. This arrangement reduces the difficulty of lifting and lowering due to the heavy weight of the synthetic resin container 1 at the beginning of tilting, and reduces the inertia of the synthetic resin container 1 during tilting, thereby making the movement of the synthetic resin container 1 more stable. When tilting at the second speed, the cargo in the synthetic resin container 1 is reduced, and increasing the speed will not generate large inertia. Such a setting can increase the speed of unloading. Finally, when moving at the third speed, the cargo in the container can be completely unloaded.

[0041] The first speed, the second speed, and the third speed are all between 0.75° / min and 1.25° / min. The first speed, the second speed, and the third speed are all angular velocities. Preferably, the first speed is 0.9° / min, the second speed is 1.1° / min, and the third speed is 0.8° / min.

[0042] When the synthetic resin container 1 is in an inclined position, the angle between the bottom surface of the synthetic resin container 1 and the horizontal plane is between 30° and 50°. The above angle can ensure that the goods in the synthetic resin container 1 can be completely unloaded.

[0043] Specifically, when unloading in a vertical position, the cargo flows out through the unloading door due to gravity, relying on the tilt angle formed by the spine and adapter inside the synthetic resin container 1. When unloading in a vertical position, it is necessary to ensure that 1 / 3 of the cargo is unloaded. Based on demand and the process cycle requirements of the unloading system, the total unloading time T is ≤ 1 hour. T = T1 + T2;

[0044] T1—vertical unloading time (T1≤20min);

[0045] T2—Tilt unloading time (T2≤40min);

[0046] When unloading cargo using the technical solution of this embodiment, the specific process is as follows:

[0047] 1. The fully loaded container arrives at the designated unloading location;

[0048] 2. Connect the safety chain;

[0049] 3. Connect the pneumatic pipeline;

[0050] 4. Connect the hydraulic pipeline;

[0051] 5. Open the outer door and connect the adapter;

[0052] 6. Open the inner door and the goods will flow out naturally;

[0053] 7. Start the hydraulic control system program, and the system automatically completes the unloading process;

[0054] 8. Close the box door and disconnect the pneumatic and hydraulic systems.

[0055] Through the above operations, the efficiency of unloading can be effectively improved and manual operations can be reduced.

[0056] The technical solution of this embodiment is a solution to the shortcomings of existing hydraulic control systems, such as complex unloading operations and low unloading efficiency. By automatically controlling the hydraulic system through PLC, unloading is completed automatically, thereby improving unloading efficiency while reducing manual operations and being safer and more reliable.

[0057] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for unloading a synthetic resin container, characterized in that: include: Keeping a synthetic resin container (1) in a vertical position, opening a discharge door (2) on a side wall of the synthetic resin container (1), and when a detection signal of a pressure sensor arranged at the bottom of the synthetic resin container (1) meets a preset condition, controlling the synthetic resin container (1) to start tilting with the long side of the bottom wall as the axis; Controlling the synthetic resin container (1) to gradually tilt from the vertical position to an inclined position within a first preset time period; When the synthetic resin container (1) reaches the inclined position, the synthetic resin container (1) is controlled to move from the inclined position to the vertical position within a second preset time period.

2. The method for unloading a synthetic resin container according to claim 1, characterized in that: When a detection signal of a pressure sensor arranged at the bottom of the synthetic resin container (1) meets a preset condition, the step of controlling the synthetic resin container (1) to start tilting with the long side of the bottom wall as the axis comprises: The detection signal detected by the pressure sensor is transmitted to a controller, wherein the detection signal corresponds to the real-time weight of the synthetic resin container (1); When the ratio of the real-time weight of the synthetic resin container (1) to the total weight of the synthetic resin container (1) satisfies a preset ratio, the controller controls the lifting mechanism to operate so that the synthetic resin container (1) starts to tilt with the long side of the bottom wall as the axis; Wherein, the preset ratio is between 0.65 and 0.

75.

3. The method for unloading a synthetic resin container according to claim 1, characterized in that: When the detection signal of the pressure sensor arranged at the bottom of the synthetic resin container (1) does not meet the preset condition, and the time for which the synthetic resin container (1) is maintained in the vertical position reaches a third preset time, the synthetic resin container (1) is controlled to start tilting with the long side of the bottom wall as the axis.

4. The method for unloading a synthetic resin container according to claim 3, characterized in that: The second preset time length is shorter than the first preset time length, and the first preset time length is longer than the third preset time length.

5. The method for unloading a synthetic resin container according to claim 4, characterized in that: The ratio of the sum of the first preset time length and the second preset time length to the third preset time length is between 1.5 and 3.

6. The method for unloading a synthetic resin container according to claim 4, characterized in that: The sum of the first preset time length and the second preset time length is between 30 minutes and 50 minutes.

7. The method for unloading a synthetic resin container according to claim 1, characterized in that: The step of controlling the synthetic resin container (1) to gradually tilt from the vertical position to the tilted position within a first preset time period comprises: When the ratio of the real-time weight of the synthetic resin container (1) to the total weight of the synthetic resin container (1) is greater than 0.55, the synthetic resin container (1) tilts at a first speed; when the ratio of the real-time weight of the synthetic resin container (1) to the total weight of the synthetic resin container (1) is greater than or equal to 0.3 and less than or equal to 0.55, the synthetic resin container (1) flips at a second speed; when the ratio of the real-time weight of the synthetic resin container (1) to the total weight of the synthetic resin container (1) is less than 0.3, the synthetic resin container (1) flips at a third speed, wherein the first speed is less than the second speed, and the third speed is less than the second speed.

8. The method for unloading a synthetic resin container according to claim 7, characterized in that: The first speed is greater than the third speed.

9. The method for unloading a synthetic resin container according to claim 8, characterized in that: The first speed, the second speed and the third speed are all between 0.75° / min and 1.25° / min.

10. The method for unloading a synthetic resin container according to any one of claims 1 to 9, characterized in that: When the synthetic resin container (1) is in the inclined position, the angle between the bottom surface of the synthetic resin container (1) and the horizontal plane is between 30° and 50°.

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