Comprehensive sample blending device in belt middle sampling system

Abstract

A comprehensive sample blending device in a belt middle sampling system comprises a conical blending hopper and a split type upper cover located above the conical blending hopper, an electric gate valve is installed at the discharging end of the lower portion of the blending hopper, a material receiving pipe is connected to the upper cover, the split type upper cover is fixedly connected to a machine frame A, and the lower portion of the conical blending hopper is provided with a discharging port. The split type upper cover and the blending hopper are connected and sealed through a flexible expansion joint, a stirring shaft is rotationally connected to the upper cover, multiple layers of stirring blades are fixedly connected to the stirring shaft, a stirring motor is fixedly connected to the upper cover, a speed reducer is fixedly connected to an output shaft of the stirring motor, and the stirring shaft is fixedly connected to an output shaft of the speed reducer. The mixing hopper is fixedly connected to a horizontal fixing sleeve, four weighing sensors are evenly distributed and installed on the lower portion of the fixing sleeve in the circumferential direction, the weighing sensors are installed and supported on a supporting face fixedly connected with the rack B, and the weighing sensors are connected to a controller. The device can realize weighing and uniform mixing.

Description

Technical Field

[0001] This utility model relates to coal sampling equipment, and in particular to a comprehensive sample mixing device in a belt conveyor sampling system, belonging to the field of mechanical equipment technology. Background Technology

[0002] In thermal power plants, coal is the core raw material. Sampling and testing of coal are required according to coal quality control requirements. This testing involves not only sampling and testing incoming coal but also collecting samples from different suppliers to form a composite sample for further testing. This is because incoming coal rarely comes from a single supplier; the coal actually used in power plant production is a mixture of coal from multiple suppliers. Therefore, in addition to sampling and testing incoming coal from different suppliers, the performance of the mixed coal from different sources also needs to be tested. During power plant operation, coal is transported via belt conveyors, so samples from different sources are typically collected using a sampler in the middle of the belt conveyor. After collection, the samples need to be reduced to a relatively accurate set weight value. Then, the samples from different sources are mixed to form a composite sample for subsequent sampling processes. Currently, weighing hoppers can meet the weighing requirements in sampling, but they cannot meet the mixing requirements. Furthermore, according to sampling requirements, cross-contamination between different composite samples should be avoided as much as possible. Summary of the Invention

[0003] The purpose of this invention is to provide a mixed sample device for a comprehensive sample in a belt sampling system, so as to meet the requirements of comprehensive sample preparation.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: a comprehensive sample mixing device in a belt-driven sampling system, comprising a conical mixing hopper, an electric slide valve installed at the lower discharge end of the mixing hopper, a discharge pipe connected to the lower part of the electric slide valve, a receiving pipe located above the mixing hopper, and a split-type top cover located above the conical mixing hopper, the receiving pipe connected to the top cover, the split-type top cover fixedly connected to the frame A, the split-type top cover and the mixing hopper being connected and sealed by a flexible expansion joint, a stirring shaft rotatably connected to the top cover, and multiple layers of stirring elements fixedly connected to the stirring shaft. The mixing blades and stirring shaft are located on the central axis of the conical mixing hopper. A stirring motor is fixedly connected to the upper cover, and a reducer is fixedly connected to the output shaft of the stirring motor. The stirring shaft is fixedly connected to the output shaft of the reducer. The mixing hopper is fixedly connected to a horizontal fixed sleeve. Four weighing sensors are evenly distributed around the lower part of the fixed sleeve. The weighing sensors are mounted and supported on a support surface fixedly connected to frame B. Frame A and frame B are independent of each other. The weighing sensors are connected to the controller. There is a corresponding discharge chute below the discharge pipe. The discharge pipe and the discharge chute are not connected.

[0005] Furthermore, multiple annular air pipes are fixedly installed on the lower surface of the upper cover. The annularity can be open or closed. No air pipe is installed below the receiving pipe. The air pipe is connected to the air source, and multiple air outlets are opened at the bottom of the air pipe.

[0006] Furthermore, the lower end of the discharge pipe is sleeved in the discharge chute.

[0007] Furthermore, the upper end face of the weighing sensor is fixedly connected to the fixed sleeve, and the lower end face of the weighing sensor has a screw hole in which a bolt is screwed. The bolt passes through the hole on the support surface, and nuts are screwed onto the bolts on both the upper and lower parts of the support surface. The horizontal height of the four weighing sensors can be adjusted by adjusting the nuts.

[0008] The beneficial technical effects of this invention are as follows: in addition to the separate stirring mechanism and weighing mechanism, this device achieves relatively high weighing accuracy for the composite sample and can also thoroughly mix the composite sample. This will be explained in detail through specific implementation methods. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention.

[0010] Figure 2 yes Figure 1 Enlarged view of part of the image.

[0011] Figure 3 This is a diagram showing the removal of the weighing function.

[0012] Figure 4 This is a top view of the present invention.

[0013] Figure 5 This is a schematic diagram of the trachea on the top cover. Detailed Implementation

[0014] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0015] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: mixing hopper; 2: top cover; 3: reducer; 4: motor; 5: fixing sleeve; 6: weighing sensor; 7: bolt; 8: electric slide valve; 9: discharge pipe; 10: discharge chute; 11: nut; 12: support surface; 13: stirring shaft; 14: impeller; 15: flexible expansion joint; 16: receiving pipe; 17: air pipe; 18: main air inlet pipe.

[0016] As shown in the attached figure, the integrated sample mixing device in the belt sampling system is located after the reducing machine. It includes a conical mixing hopper 1. An electric slide valve 8 is installed at the lower discharge end of the mixing hopper 1. The lower part of the electric slide valve is connected to the discharge pipe 9. The lower end of the discharge pipe is sleeved in the discharge chute 10, so that the discharge chute does not affect the weighing. The receiving pipe 16 is located above the mixing hopper. The material after being reduced by the reducing machine falls into the receiving pipe. It also includes a split-type top cover 2 located above the conical mixing hopper. The receiving pipe 16 is connected to the top cover, which is fixedly connected to the frame A (not shown in the figure). The frame A is directly and indirectly fixedly connected to a fixed foundation. The split-type top cover and the mixing hopper are connected and sealed by a flexible expansion joint 15. A stirring shaft 13 is rotatably connected to the top cover 1. Multiple layers of stirring blades 14 are fixedly connected to the stirring shaft, which is located at different angles. The stirring shaft is located on the central axis of the conical mixing hopper. A stirring motor 4 is fixedly connected to the top cover. A reducer 3 is fixedly connected to the output shaft of the stirring motor 4. The stirring shaft 13 is fixedly connected to the output shaft of the reducer. The mixing hopper 1 is fixedly connected to a horizontal... Four weighing sensors 6 are evenly distributed around the lower circumference of the fixed sleeve 5. The weighing sensors are mounted and supported on a support surface fixedly connected to the frame B. Frames A and B are independent of each other; frame B is not connected to frame A. Frames A and B can be independently and fixedly connected to a fixed building foundation. This is to prevent the vibration generated by the motor during mixing from negatively affecting the mixing hopper. In this embodiment, the upper end face of the weighing sensor 6 is fixedly connected to the fixed sleeve 5, and the lower end face of the weighing sensor has a screw hole into which a bolt 7 is screwed. The bolt passes through a hole on the support surface 12, and nuts 11 are screwed onto the bolts on both the upper and lower parts of the support surface 12. The horizontal height of the four weighing sensors is adjusted by adjusting the nuts, which facilitates installation and adjustment, and also facilitates weighing calibration. The weighing sensors are connected to the controller. A discharge chute corresponds to the discharge pipe below the discharge pipe, but the discharge pipe and the discharge chute are not connected.

[0017] The upper cover of this device is connected to the mixing hopper via an expansion joint. The weight on the upper cover is not transmitted to the pressure sensor, which greatly reduces the weight of the weighing device and increases the proportion of the total sample in the total weight, thus improving the accuracy of weighing. The stirring blades being pressed down by the coal sample will have a slight impact on the weighing sensor, but this is a systematic error that can be corrected.

[0018] In this embodiment, multiple annular air pipes 17 are fixedly installed on the lower surface of the upper cover. The annularity can be an open ring or a closed ring. No air pipe is set below the receiving pipe. The air pipes are connected to the air source. In this embodiment, the air pipes 17 are connected to the main air inlet pipe 18, which is connected to the air source. Multiple air outlets are opened at the bottom of the air pipes. Compressed air is blown out through the air outlets. The compressed air has two functions: first, to blow away the material on the mixing hopper and the stirring blades to minimize cross-contamination between samples; second, for some materials with high water and powder content, which may adhere to the mixing hopper or the blades, the compressed air can dry them, making them easier to remove after drying.

[0019] When this device is in use, the material from the receiving pipe falls into the mixing hopper. The weighing sensor continuously weighs the material. When the material reaches the designed weight range, the feeding stops. At this time, the motor starts and drives the stirring shaft to rotate to mix the material. After the mixing time is reached, the motor stops, the electric slide valve opens, and the mixed sample is discharged from the discharge pipe into the discharge chute to enter the next process. Compressed air enters the main air inlet pipe and blows out from the air outlet to purge the mixing hopper, impeller, and stirring shaft. After purging, the electric slide valve closes and the next operation begins.

[0020] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. A comprehensive sample mixing device in a belt conveyor sampling system, comprising a conical mixing hopper, wherein an electric slide valve is installed at the lower discharge end of the mixing hopper, the lower part of the electric slide valve is connected to a discharge pipe, and a receiving pipe is located above the mixing hopper, characterized in that: The upper cover is fixedly connected to the rack A, and the upper cover and the mixing hopper are connected and sealed through a flexible expansion joint.

2. The integrated sample blend apparatus in a belt mid-system sampling system of claim 1, wherein: A plurality of annular air pipes are fixedly installed on the lower surface of the upper cover, and the annular air pipes are open rings or closed rings.

3. The integrated sample mix device in a belt center sampling system of claim 1, wherein: The lower end of the discharge pipe is sleeved in the discharge chute.

4. The integrated sample blend apparatus in a belt center sampling system of claim 1, wherein: The upper end surface of the weighing sensor is fixedly connected to the fixed sleeve, the lower end surface of the weighing sensor has a threaded hole, a bolt is screwed in the threaded hole, the bolt passes through a hole in the support surface, and nuts are screwed on the bolts above and below the support surface to adjust the horizontal height of the four weighing sensors.

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