A multi-time point sampling device and method for asphalt mixture of asphalt mixing station finished product

Abstract

The application provides a multi-time-point sampling device and method for finished asphalt mixture of an asphalt mixing station, and relates to the technical field of asphalt mixture production, and comprises a finished product bin and an upper computer. One side of the finished product bin is provided with a sampling driving mechanism, and a sampling bucket is arranged on the sampling driving mechanism. One side of the sampling driving mechanism is provided with a PLC controller in communication connection with the upper computer. The PLC controller is used for reading vehicle loading task data, obtaining vehicle planned loading capacity, single-batch planned unloading weight, finished product bin unloading state and a current unloading batch, and calculating the expected unloading batch number of the vehicle according to the vehicle planned loading capacity and the single-batch planned unloading weight. The target sampling batch is determined according to the first batch, the intermediate batch and the last batch. The application has a reasonable structure, can reflect the actual situation of the mixture in the early and middle stages of loading, improves the representativeness of the sample on the whole vehicle asphalt mixture, and has high sampling safety.

Description

Technical Field

[0001] This invention relates to the field of asphalt mixture production technology, specifically to a multi-time-point sampling device and method for finished asphalt mixtures from asphalt mixing plants. Background Technology

[0002] In asphalt mixing plants, finished asphalt mixtures are typically sampled manually from the surface of the asphalt pile inside the truck bed using sampling shovels and other tools when the transport vehicle is nearly full or after loading is complete. These samples are then used as the test samples for that truck or production batch. However, in actual production, a single transport vehicle is usually loaded from multiple production batches consecutively. Using the above method, the samples obtained mainly come from the later stages of loading and the surface of the pile, making it difficult to reflect the actual condition of the mixture in the early and middle stages of loading. Furthermore, asphalt mixtures may experience segregation of coarse and fine aggregates during storage, unloading, dropping, and stacking. Sampling from a single location can easily lead to sample composition deviations, reducing the representativeness of the sample for the entire truckload of asphalt mixture. In addition, asphalt mixtures have high temperatures, and manual close-range sampling poses a risk of burns, resulting in low sampling safety. Therefore, there is an urgent need for a multi-time-point sampling device for finished asphalt mixtures from asphalt mixing plants to solve these problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a multi-time-point sampling device and method for finished asphalt mixtures in asphalt mixing plants, thereby solving the problems mentioned in the background art. The present invention has a reasonable structure, can reflect the actual situation of the mixture in the early and middle stages of loading, improves the representativeness of the sample to the whole truckload of asphalt mixture, and has high sampling safety.

[0004] To achieve the above objectives, the present invention provides a multi-time-point sampling device for finished asphalt mixtures at an asphalt mixing plant, comprising:

[0005] The finished product silo and the host computer, which is located in the control room of the asphalt mixing plant, are used to store vehicle loading task data;

[0006] A sampling drive mechanism is provided on one side of the finished product silo, and the sampling drive mechanism is provided with a sampling hopper for sampling the material flowing out of the discharge port of the finished product silo.

[0007] A PLC controller connected to a host computer is provided on one side of the sampling drive mechanism. The PLC controller is used to read vehicle loading task data, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished product silo and the current unloading batch, and calculate the expected number of unloading batches of the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, the middle batch and the last batch.

[0008] The PLC controller is also used to read vehicle loading task data to obtain the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism to control the sampling drive mechanism to drive the sampling bucket to perform sampling action.

[0009] Furthermore, the expected number of unloading batches is calculated as follows: planned vehicle loading / planned unloading weight per batch, where the expected number of unloading batches is rounded down;

[0010] The target sampling batches include the first batch, intermediate batches, and the last batch;

[0011] The first batch is the first unloading batch of the current vehicle loading task;

[0012] The last batch refers to the final unloading batch that completes the planned loading volume of the vehicle.

[0013] The batch number of the intermediate batch is determined as follows: when the expected number of unloading batches is an odd number, the expected number of unloading batches is divided by 2 and rounded up;

[0014] When the expected number of unloading batches is an even number, divide the expected number of unloading batches by 2.

[0015] Furthermore, the sampling drive mechanism includes a vertical support frame, on which a horizontal electric cylinder is provided. A mounting base is provided on the moving block of the horizontal electric cylinder. A drive motor is provided inside the mounting base. The output shaft of the drive motor passes through the side wall of the mounting base and is connected to the sampling hopper.

[0016] The PLC controller is electrically connected to the horizontal electric cylinder and the drive motor respectively;

[0017] The horizontal electric cylinder is equipped with three sampling points, corresponding to the left, middle and right sides of the material flow coming out of the unloading port of the finished product silo.

[0018] Furthermore, the vertical support frame includes a vertical frame, and a connecting seat is provided on the side wall of the vertical frame. The side wall of the connecting seat has a through mounting groove, through which the transverse electric cylinder passes.

[0019] Furthermore, a feed trough is provided at the top of the sampling hopper.

[0020] Furthermore, the PLC controller communicates with the host computer via an Ethernet interface and uses the Modbus TCP protocol.

[0021] Furthermore, it also includes a base plate, with the sampling drive mechanism located on top of the base plate and the vertical support frame located on top of the base plate.

[0022] Furthermore, a housing is provided on the top of the base plate, and the PLC controller is located inside the housing;

[0023] A fixed frame is provided on the top of the base plate, a sample receiving hopper is provided on the fixed frame, and a discharge valve is provided at the bottom of the sample receiving hopper.

[0024] A method for sampling finished asphalt mixtures using a multi-time-point sampling device at an asphalt mixing plant includes the following steps:

[0025] Step A: The PLC controller communicates with the host computer of the asphalt mixing plant to read the vehicle loading task data in real time, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished material bin and the current unloading batch, and calculate the expected number of unloading batches for the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, intermediate batch and last batch.

[0026] Step B: The PLC controller acquires the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism to control the sampling drive mechanism to drive the sampling bucket to perform the sampling action.

[0027] Furthermore, the step B of controlling the sampling drive mechanism to drive the sampling bucket to perform the sampling action includes the following steps:

[0028] Step B1: The transverse electric cylinder in the sampling drive mechanism receives the sampling control signal and drives the drive motor in the mounting base to move to the sampling position. The drive motor drives the sampling hopper to move to at least two positions on the left, middle and right of the material flow below the discharge port of the finished product silo to obtain the mixed material. The sampling hopper samples the material flowing out of the discharge port of the finished product silo through the feed chute.

[0029] Step B2: After sampling is completed, the horizontal electric cylinder drives the drive motor in the mounting base to move above the subsample receiving hopper, and the drive motor drives the sampling hopper to move above the subsample receiving hopper.

[0030] Step B3: The drive motor drives the sampling hopper to rotate, which in turn drives the sampling trough to rotate. The sampling trough rotates and is located at the bottom of the sampling hopper. The sampled material falls from the sampling trough into the sub-sample receiving hopper, completing the sample release.

[0031] In step B4, the drive motor operates to rotate the sampling hopper back to its initial position, and the pick-and-place slot is located at the top of the sampling hopper.

[0032] Beneficial effects:

[0033] This invention uses a PLC controller to communicate with the host computer of the asphalt mixing plant to obtain the planned loading amount of the vehicle, the planned unloading weight of a single batch, the unloading status of the finished material silo, and the current unloading batch. Based on the obtained planned loading amount and planned unloading weight of a single batch, the expected number of unloading batches for the vehicle is calculated. The target sampling batch is determined according to the first batch, intermediate batch, and last batch. When the PLC controller obtains that the current unloading batch has reached the target sampling batch, it sends a sampling control signal to the sampling drive mechanism, which drives the sampling hopper to perform the sampling action. This invention can perform multi-time point sampling of the material in the first batch, intermediate batch, and last batch, which can reflect the actual situation of the mixture in the early and middle stages of loading, avoid manual sampling, and improve the safety of sampling.

[0034] When the sampling bucket is driven by the transverse electric cylinder in the sampling drive mechanism, the mixture is obtained at least at two positions on the left, middle and right sides of the material flow to reduce the impact of local segregation of the material flow on the sampling results and improve the representativeness of the sample to the whole vehicle asphalt mixture. Attached Figure Description

[0035] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 This is a perspective view of a multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to an embodiment of the present invention.

[0037] The components include: 1. Finished product silo; 2. Sampling hopper; 21. Feed trough; 3. Sampling drive mechanism; 31. Mounting base; 32. Drive motor; 33. Horizontal electric cylinder; 34. Vertical support frame; 341. Connecting seat; 342. Mounting slot; 343. Vertical frame; 4. Sub-sample receiving hopper; 5. Fixing frame; 6. PLC controller; 7. Base plate; 8. Discharge valve.

[0038] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0040] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0041] like Figure 1 As shown, this embodiment of the invention provides a multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant, comprising:

[0042] Finished material silo 1 and host computer, the host computer is set in the control room of the asphalt mixing plant and is used to store vehicle loading task data;

[0043] A sampling drive mechanism 3 is provided on one side of the finished product silo 1. The sampling drive mechanism 3 is equipped with a sampling hopper 2 for sampling the material flowing out from the discharge port of the finished product silo 1.

[0044] A PLC controller 6 connected to the host computer is provided on one side of the sampling drive mechanism 3. The PLC controller 6 is used to read the vehicle loading task data, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished product bin 1 and the current unloading batch, and calculate the expected number of unloading batches of the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, the middle batch and the last batch.

[0045] The PLC controller 6 is also used to read vehicle loading task data to obtain the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism 3 to control the sampling drive mechanism 3 to drive the sampling bucket 2 to perform sampling action. This design uses a PLC controller 6 to communicate with the host computer of the asphalt mixing plant to obtain the planned loading amount of the vehicle, the planned unloading weight of a single batch, the unloading status of the finished material silo 1, and the current unloading batch. Based on the obtained planned loading amount and planned unloading weight of a single batch, the expected number of unloading batches for the vehicle is calculated. The target sampling batch is determined according to the first batch, intermediate batch, and last batch. When the PLC controller 6 detects that the current unloading batch has reached the target sampling batch, it sends a sampling control signal to the sampling drive mechanism 3, which drives the sampling hopper 2 to perform the sampling action. This design enables multi-point sampling of the first, intermediate, and last batches of material, reflecting the actual situation of the mixture in the early and middle stages of loading, avoiding manual sampling, and improving sampling safety. In particular, the PLC controller 6 reads the unloading status of the finished material silo 1 to determine whether unloading is in progress, which facilitates the use of the sampling drive mechanism 3 to drive the sampling hopper 2 to perform the sampling action.

[0046] The expected number of unloading batches is calculated as follows: planned vehicle loading / planned unloading weight per batch. The expected number of unloading batches is rounded down. For example, if the planned vehicle loading is 41 tons and the unloading weight is 5 tons per batch (this is a fixed parameter for asphalt stations), the number of batches is 41 / 8=5.

[0047] The target sampling batches include the first batch, intermediate batches, and the last batch;

[0048] The first batch is the first unloading batch for the current vehicle loading task;

[0049] The final batch is the last unloading batch to complete the planned loading volume of the vehicle.

[0050] The batch number of intermediate batches is determined as follows: when the expected number of unloading batches is odd, divide the expected number of unloading batches by 2 and round up;

[0051] When the expected number of unloading batches is an even number, divide the expected number of unloading batches by 2. This design facilitates the determination of the batch numbers for the first unloading batch, intermediate batches, and the last unloading batch. It sends a sampling control signal to the sampling drive mechanism 3, controlling the mechanism to drive the sampling hopper 2 to perform the sampling action. An example of calculating the target sampling batch is as follows: A transport vehicle plans to load 40 tons of asphalt mixture. The planned unloading weight per batch (i.e., the weight of a single mixing batch) is 5 tons, and the expected number of unloading batches is 8. Therefore, the batch number for the intermediate batch is 8 / 2 = 4. This is calculated to allow sampling during the first, fourth, and eighth unloading processes, corresponding to the early, middle, and late stages of loading, respectively. If the expected number of unloading batches is 5, the batch number for the intermediate batch is 5 / 2 = 2.5, and then the intermediate value of 3 is taken. The first, third, and fifth unloading processes correspond to the early, middle, and late stages of loading sampling, respectively. The PLC controller 6 calculates the expected number of unloading batches for the vehicle through its internal arithmetic logic unit and determines the target sampling batch according to the first, intermediate, and last batches. The host computer is an industrial control computer.

[0052] The sampling drive mechanism 3 includes a vertical support frame 34, a horizontal electric cylinder 33 is provided on the vertical support frame 34, a mounting base 31 is provided on the moving block of the horizontal electric cylinder 33, a drive motor 32 is provided inside the mounting base 31, and the output shaft of the drive motor 32 passes through the side wall of the mounting base 31 and is connected to the sampling bucket 2.

[0053] The PLC controller 6 is electrically connected to the horizontal electric cylinder 33 and the drive motor 32 respectively;

[0054] Three sampling points are set on the transverse electric cylinder 33, corresponding to the left, middle, and right sides of the material flow from the discharge port of the finished product silo 1. This design uses a support frame in the sampling drive mechanism 3 to support and fix the transverse electric cylinder 33. The transverse electric cylinder 33 facilitates the movement of the sampling hopper 2 below the discharge port of the finished product silo 1, making it convenient to sample the material flowing from the discharge port. The drive motor 32 facilitates the flipping and releasing of the sampling hopper 2. By changing the sampling position using the transverse electric cylinder 33, the mixture can be obtained from at least two of the left, middle, and right sides of the material flow, reducing the impact of local segregation on the sampling results and improving the representativeness of the sample for the entire asphalt mixture. The three sampling points are set with fixed values ​​on the transverse electric cylinder 33 according to the width of the discharge port.

[0055] The vertical support frame 34 includes a vertical frame 343. A connecting seat 341 is provided on the side wall of the vertical frame 343. A through mounting groove 342 is formed on the side wall of the connecting seat 341, through which the horizontal electric cylinder 33 passes. This design facilitates the connection of the connecting seat 341 to the vertical frame 343; the mounting groove 342 facilitates the installation of the horizontal electric cylinder 33; and the connection between the horizontal electric cylinder 33 and the mounting groove 342 is secured with bolts.

[0056] The top of the sampling hopper 2 is provided with a feed chute 21, which improves the rationality of the design.

[0057] PLC controller 6 communicates with the host computer via an Ethernet interface and uses the Modbus TCP protocol. This design facilitates communication between PLC controller 6 and the host computer.

[0058] It also includes a base plate 7, with the sampling drive mechanism 3 located on top of the base plate 7, and a vertical support frame 34 located on top of the base plate 7. This design facilitates the support of the vertical support frame 34 through the base plate 7; wherein, the top of the base plate 7 is connected to the bottom of the vertical frame 343 of the vertical support frame 34.

[0059] The base plate 7 has a housing on top, and the PLC controller 6 is located inside the housing;

[0060] A fixing frame 5 is installed on the top of the base plate 7, and a sample receiving hopper 4 is installed on the fixing frame 5. A discharge valve 8 is installed at the bottom of the sample receiving hopper 4. This design facilitates the collection of sample material from the sampling hopper 2 through the sample receiving hopper 4; and facilitates the removal of the collected sample material through the discharge valve 8.

[0061] A method for sampling finished asphalt mixtures using a multi-time-point sampling device at an asphalt mixing plant includes the following steps:

[0062] Step A: The PLC controller 6 communicates with the host computer of the asphalt mixing plant to read the vehicle loading task data in real time, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished material bin and the current unloading batch, and calculate the expected number of unloading batches for the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, the middle batch and the last batch.

[0063] Step B: PLC controller 6 acquires the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism 3 to control the sampling drive mechanism 3 to drive the sampling bucket 2 to perform the sampling action.

[0064] Step B involves controlling the sampling drive mechanism 3 to drive the sampling bucket 2 to perform the sampling action, including the following steps:

[0065] In step B1, the transverse electric cylinder 33 in the sampling drive mechanism 3 receives the sampling control signal and drives the drive motor 32 in the mounting base 31 to move to the sampling position. The drive motor 32 drives the sampling hopper 2 to move to at least two positions on the left, middle and right sides of the material flow below the discharge port of the finished product silo 1 to obtain the mixed material. The sampling hopper 2 samples the material flowing out from the discharge port of the finished product silo 1 through the feed chute 21.

[0066] Step B2: After sampling is completed, the horizontal electric cylinder 33 drives the drive motor 32 in the mounting base 31 to move above the sample receiving hopper 4, and the drive motor 32 drives the sampling hopper 2 to move above the sample receiving hopper 4.

[0067] In step B3, the drive motor 32 drives the sampling hopper 2 to rotate, and the rotation of the sampling hopper 2 drives the sampling trough to rotate. The sampling trough rotates and is located at the bottom of the sampling hopper 2. The sampled material falls from the sampling trough into the sub-sample receiving hopper 4, completing the sample release.

[0068] In step B4, the drive motor 32 operates to rotate the sampling hopper 2 back to its initial position, and the pick-and-place slot is located at the top of the sampling hopper 2.

[0069] Reference Figure 1As an embodiment of the present invention: when it is necessary to sample the material flowing out of the unloading port of the finished product silo 1, the PLC controller 6 reads the vehicle loading task data in real time, obtains the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished product silo 1 and the current unloading batch, and calculates the expected number of unloading batches of the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determines the target sampling batch according to the first batch, the middle batch and the last batch. According to the obtained current unloading batch, when the current unloading batch reaches the target sampling batch, the PLC controller 6 sends a sampling control signal to the transverse electric cylinder 33 and the drive motor 32 in the sampling drive mechanism 3. The transverse electric cylinder 33 in the sampling drive mechanism 3 receives the sampling control signal and drives the drive motor 32 in the mounting base 31 to move to the sampling position. The drive motor 32 drives the sampling bucket 2 to move to the sampling position, which is located below the unloading port of the finished product silo 1 for sampling. The sampling position is at least two of the left, middle and right positions of the material flow to obtain the mixed material.

[0070] After sampling, the transverse electric cylinder 33 drives the drive motor 32 in the mounting base 31 to move above the sub-sample receiving hopper 4. The drive motor 32 drives the sampling hopper 2 to move above the sub-sample receiving hopper 4. The drive motor 32 drives the sampling hopper 2 to rotate, and the rotation of the sampling hopper 2 drives the sampling trough to rotate. The sampled material falls from the sampling trough into the sub-sample receiving hopper 4. After the sampling is completed, the drive motor 32 drives the sampling hopper 2 to rotate back to the initial position. The sampling hopper 2 is driven by the sampling drive mechanism 3 to perform sampling actions in the first batch, the middle batch and the last batch, respectively, to ensure that sampling is carried out at multiple time points in the first batch, the middle batch and the last batch of material. This can reflect the actual situation of the mixture in the early and middle stages of loading. The sampling position is changed by the transverse electric cylinder 33. By obtaining the mixture from at least two positions on the left, middle and right sides of the material flow during sampling, the influence of local segregation of the material flow on the sampling results is reduced, the representativeness of the sample to the whole truck asphalt mixture is improved, manual sampling is avoided and the safety of sampling is improved.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant, characterized in that, include: Finished material silo (1) and host computer, the host computer being located in the control room of the asphalt mixing plant and used to store vehicle loading task data; A sampling drive mechanism (3) is provided on one side of the finished product silo (1), and a sampling bucket (2) is provided on the sampling drive mechanism (3) for sampling the material flowing out from the discharge port of the finished product silo (1). The sampling drive mechanism (3) is provided with a PLC controller (6) connected to the host computer on one side. The PLC controller (6) is used to read the vehicle loading task data, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished product bin and the current unloading batch, and calculate the expected unloading batch number of the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, the middle batch and the last batch. The PLC controller (6) is also used to read vehicle loading task data to obtain the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism (3) to control the sampling drive mechanism (3) to drive the sampling bucket (2) to perform sampling action.

2. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 1, characterized in that, The estimated number of unloading batches is calculated as follows: planned vehicle loading / planned unloading weight per batch, where the estimated number of unloading batches is rounded down; The target sampling batches include the first batch, intermediate batches, and the last batch; The first batch is the first unloading batch of the current vehicle loading task; The last batch refers to the final unloading batch that completes the planned loading volume of the vehicle. The batch number of the intermediate batch is determined as follows: when the expected number of unloading batches is an odd number, the expected number of unloading batches is divided by 2 and rounded up; When the expected number of unloading batches is an even number, divide the expected number of unloading batches by 2.

3. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 1, characterized in that, The sampling drive mechanism (3) includes a vertical support frame (34), on which a horizontal electric cylinder (33) is provided. A mounting base (31) is provided on the moving block of the horizontal electric cylinder (33). A drive motor (32) is provided inside the mounting base (31). The output shaft of the drive motor (32) passes through the side wall of the mounting base (31) and is connected to the sampling bucket (2). The PLC controller (6) is electrically connected to the transverse electric cylinder (33) and the drive motor (32) respectively; The transverse electric cylinder (33) is provided with three sampling points, which correspond to the left, middle and right sides of the material flow flowing out from the discharge port of the finished product silo (1).

4. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 3, characterized in that, The vertical support frame (34) includes a vertical frame (343), and a connecting seat (341) is provided on the side wall of the vertical frame (343). A through mounting groove (342) is opened on the side wall of the connecting seat (341), and the horizontal electric cylinder (33) passes through the mounting groove (342).

5. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 1, characterized in that, The top of the sampling hopper (2) is provided with a feeding trough (21).

6. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 1, characterized in that, The PLC controller (6) communicates with the host computer via an Ethernet interface and uses the Modbus TCP protocol.

7. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 3, characterized in that, It also includes a base plate (7), the sampling drive mechanism (3) is located on the top of the base plate (7), and the vertical support frame (34) is located on the top of the base plate (7).

8. The multi-time-point sampling device for finished asphalt mixture at an asphalt mixing plant according to claim 7, characterized in that, The base plate (7) is provided with a box on top, and the PLC controller (6) is located inside the box; The bottom plate (7) is provided with a fixed frame (5) at the top, and a sample receiving hopper (4) is provided on the fixed frame (5). A discharge valve (8) is provided at the bottom of the sample receiving hopper (4).

9. A method for sampling finished asphalt mixtures from an asphalt mixing plant using a multi-time-point sampling device as described in any one of claims 1-8, characterized in that, Includes the following steps: Step A: The PLC controller (6) communicates with the host computer of the asphalt mixing plant to read the vehicle loading task data in real time, obtain the vehicle's planned loading amount, the planned unloading weight of a single batch, the unloading status of the finished material bin and the current unloading batch, and calculate the expected unloading batch number of the vehicle based on the vehicle's planned loading amount and the planned unloading weight of a single batch, and determine the target sampling batch according to the first batch, the middle batch and the last batch. Step B: The PLC controller (6) acquires the current unloading batch. When the current unloading batch reaches the target sampling batch, it sends a sampling control signal to the sampling drive mechanism (3) to control the sampling drive mechanism (3) to drive the sampling bucket (2) to perform the sampling action.

10. The method for sampling using a multi-time-point sampling device for finished asphalt mixtures from an asphalt mixing plant according to claim 9, characterized in that, The control sampling drive mechanism (3) in step B drives the sampling bucket (2) to perform the sampling action, including the following steps: Step B1, the transverse electric cylinder (33) in the sampling drive mechanism (3) receives the sampling control signal and drives the drive motor (32) in the mounting base (31) to move to the sampling position. The drive motor (32) drives the sampling bucket (2) to move to at least two positions on the left, middle and right sides of the material flow below the discharge port of the finished product silo (1) to obtain the mixed material. The sampling bucket (2) samples the material flowing out from the discharge port of the finished product silo (1) through the feed chute (21). Step B2: After sampling is completed, the horizontal electric cylinder (33) drives the drive motor (32) in the mounting base (31) to move above the sample receiving hopper (4), and the drive motor (32) drives the sampling hopper (2) to move above the sample receiving hopper (4). Step B3: The drive motor (32) works to drive the sampling bucket (2) to rotate. The rotation of the sampling bucket (2) drives the sampling trough to rotate. The sampling trough rotates and is located at the bottom of the sampling bucket (2). The sampled material falls from the sampling trough into the sub-sample receiving bucket (4) to complete the sampling. In step B4, the drive motor (32) operates to drive the sampling bucket (2) to rotate back to the initial position, and the pick-and-place slot is located at the top of the sampling bucket (2).

Images