Belt middle sampling device

Abstract

The invention discloses a belt middle sampling device which comprises a rack, a driving mechanism, a sampling head and a detection unit, the driving mechanism is installed on the rack, and the sampling head is located above a belt and connected with the output end of the driving mechanism to rotate and sample; the detection unit is mounted on the rack and is used for being in contact with the scraper of the rotating sampling head for detection. According to the sampling device, the sampling head is matched with the detection unit, whether the scraper is abraded or not is detected and fed back in real time, and full-section sampling of the sampling device is guaranteed.

Description

Technical Field

[0001] This application relates to the field of coal sampling technology, and in particular to a sampling device for the middle of a conveyor belt. Background Technology

[0002] In mechanized coal sampling, belt conveyor sampling systems primarily employ two types of primary sampling devices: mid-belt sampling devices and end-belt sampling devices. Mid-belt sampling devices require full-section sampling, meaning the sampling head must collect coal samples from the entire sampling area. Since the sampling head comes into contact with the belt, the scraper on the sampling head that contacts the belt is typically made of materials such as rubber or polyurethane to prevent belt damage. However, these materials themselves are subject to wear, and once the wear reaches a certain point, full-section sampling becomes impossible.

[0003] Currently, the sampling devices in the middle of the conveyor belt often determine whether the scraper is worn by observing the residue on the belt at the sampling point after sampling, or by checking back after the system backend data has problems. The information feedback efficiency is too low, which means that when the scraper is worn, the sampling cannot guarantee the full cross section, which will affect the representativeness of the coal sample. Summary of the Invention

[0004] This invention provides a belt mid-section sampling device to solve the technical problem in the prior art where the mid-section sampling device cannot provide timely feedback of scraper wear information, resulting in unrepresentative sampling information.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows: In a first aspect, the present invention provides a belt mid-sampling device, comprising a frame, a drive mechanism, a sampling head, and a detection unit. The drive mechanism is mounted on the frame, the sampling head is located above the belt and connected to the output end of the drive mechanism for rotation and sampling, and the detection unit is mounted on the frame for contacting the scraper of the rotating sampling head for detection.

[0006] Furthermore, the detection unit includes an electric cylinder and a limit switch. The electric cylinder is fixed on the frame, and the limit switch is connected to the output end of the electric cylinder to extend or retract. The sampling head rotates to sample, and the scraper contacts the extended end of the limit switch.

[0007] Furthermore, the limit switch is a oscillating pin switch.

[0008] Furthermore, the sampling head rotates to sample, and the scraper contacts a movable end of the pendulum needle of the pendulum switch, causing the pendulum needle to rotate until it separates from the scraper.

[0009] Furthermore, the contact length between the lower end face of the scraper and the upper end face of the oscillating needle is no more than 0.5 mm.

[0010] Furthermore, the drive mechanism includes a motor, a coupling, a brake, and a main shaft. The motor is mounted on the frame, and the output end of the motor is connected to the main shaft through the coupling. The output end of the main shaft is connected to the sampling head. The brake is mounted on the frame and holds the main shaft to restrict the rotation of the main shaft.

[0011] Furthermore, the movable end of the main shaft passes through the sampling head and is fixedly connected to the sampling head to drive the sampling head to rotate, and the movable end of the main shaft is rotatably fixed on the frame.

[0012] Furthermore, the drive mechanism also includes multiple stiffeners, which are provided at the connection between the main shaft and the sampling head, and are respectively connected to the main shaft and the sampling head.

[0013] Furthermore, the belt-mounted sampling device also includes a coal flow sensing element, which is fixed to the frame and electrically connected to the brake to release the main shaft.

[0014] The belt sampling device provided by this invention has a sampling head connected to the output end of a drive mechanism. The drive mechanism drives the sampling head to rotate and perform sampling on the belt. A detection unit is also mounted on the frame. When the sampling head rotates past the detection unit, the scraper of the sampling head contacts the detection unit, and the detection unit can detect the scraper. If the scraper is not detected within a preset time, an alarm is triggered indicating scraper wear. This sampling device utilizes the cooperation of the sampling head and the detection unit to detect and provide feedback on scraper wear in real time, ensuring full-section sampling. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the belt mid-sampling device in an embodiment of the present invention; Figure 2 This is a side view of the belt mid-sampling device in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view of AA.

[0017] Figure label: 10. Rack; 20. Drive mechanism; 21. Motor; 22. Coupling; 23. Brake; 24. Main shaft; 25. Rib plate; 30. Sampling head; 31. Scraper; 40. Detection unit; 41. Electric cylinder; 42. Limit switch; 50. Coal flow sensing element; 60. Belt conveyor. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0022] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0023] like Figure 1 , Figure 2 As shown in the figure, this application provides a belt mid-section sampling device, including a frame, a drive mechanism, a sampling head, and a detection unit. The drive mechanism is mounted on the frame, and the sampling head is located above the belt and connected to the output end of the drive mechanism to rotate and sample. The detection unit is mounted on the frame for contacting the scraper of the rotating sampling head for detection.

[0024] In this embodiment, the sampling head is positioned above the belt, and the output end of the drive mechanism is connected to the sampling head. The drive mechanism drives the sampling head to rotate, enabling full-section sampling as the sampling head passes the belt. A scraper is provided at the end of the sampling head, which scrapes against the belt during sampling and gradually wears down. A detection unit is mounted on the frame, and the detection end of the detection unit is positioned at the location where the scraper on the sampling head rotates. During the rotation of the sampling head, the scraper rotates past the detection unit and contacts it, thus detecting whether the scraper is worn.

[0025] If the detection unit does not contact the scraper within a preset time, it indicates that the scraper is worn. The preset time can be set based on the actual time it takes for the sampling head to rotate one revolution, and can be the rotation time of 1 to 4 revolutions of the sampling head. The detection unit may include a contact sensor or a photoelectric sensor. The scraper contacts the contact sensor when it rotates to detect whether the scraper is worn. In this embodiment, the detection unit can be set at the starting position of the sampling head's operation, or at any position during the rotation of the sampling head.

[0026] The belt sampling device provided in this embodiment has a sampling head connected to the output end of a drive mechanism. The drive mechanism rotates the sampling head to perform sampling on the belt. A detection unit is also mounted on the frame. When the sampling head rotates past the detection unit, the scraper of the sampling head contacts the detection unit, allowing the detection unit to detect the scraper. If the scraper is not detected within a preset time, an alarm is triggered indicating scraper wear. This sampling device utilizes the cooperation of the sampling head and the detection unit to detect and provide feedback on scraper wear in real time, ensuring full-section sampling and timely prompting for scraper replacement.

[0027] In some embodiments, the detection unit includes an electric cylinder and a limit switch. The electric cylinder is fixed on the frame, and the limit switch is connected to the output end of the electric cylinder to extend or retract. The sampling head rotates to sample, and the scraper contacts the end of the extended limit switch.

[0028] In this embodiment, to avoid frequent testing damaging the sensor, a limit switch is installed at the output end of the electric cylinder. The output end of the electric cylinder can control the detection end of the limit switch to automatically extend periodically and contact the scraper for testing, thereby extending the service life of the limit switch. The testing time can be preset in advance; when testing is required, the electric cylinder simply pushes out the detection end of the limit switch.

[0029] In this embodiment, the limit switch is a pinwheel switch. When the scraper needs to be detected, an electric cylinder pushes out the pinwheel of the limit switch. When the scraper of the sampling head rotates to the corresponding position of the pinwheel, the scraper contacts the pinwheel, and the scraper is detected. Figure 3 .

[0030] Specifically, the sampling head rotates to sample and the scraper contacts the movable end of the pendulum needle of the pendulum switch, causing the pendulum needle to rotate until it separates from the scraper. The contact length between the lower end face of the scraper and the upper end face of the pendulum needle is no more than 0.5 mm.

[0031] In this embodiment, the distance between the detection end of the limit switch (such as the end of the pendulum needle) and the scraper can be adjusted in advance. If high accuracy is required for scraper wear, the scraper end when unworn can be set to abut against the detection end of the limit switch; if lower accuracy is required, the detection end can be set to extend into the sampling head when the unworn scraper rotates above the limit switch, i.e., the upper end face of the detection end abuts against the corresponding lower end face of the scraper. The distance the detection end extends into the sampling head is no more than 0.5 mm. As the scraper continues to rotate with the sampling head, it pushes the end of the pendulum needle downwards until the scraper separates from the pendulum needle.

[0032] In some embodiments, the drive mechanism includes a motor, a coupling, a brake, and a main shaft. The motor is mounted on the frame, and the output end of the motor is connected to the main shaft via the coupling. The output end of the main shaft is connected to the sampling head. The brake is mounted on the frame and holds the main shaft to limit its rotation.

[0033] In this embodiment, the drive mechanism is connected to the sampling head via a main shaft, controlling the sampling head to rotate above the belt for full-section sampling. When the sampling head completes one revolution and returns to its stationary position, the brake locks the main shaft, immediately stopping the sampling head from failing to stop due to inertia.

[0034] In some embodiments, the movable end of the spindle passes through and is fixedly connected to the sampling head to drive the sampling head to rotate, and the movable end of the spindle is rotatably fixed to the frame. (Refer to...) Figure 1One end of the spindle is connected to the output end of the drive mechanism, and the other end passes through the sampling head and is fixedly connected to it and rotated and fixed on the frame, which can keep the spindle stable during the rotation of the sampling head.

[0035] In some embodiments, the drive mechanism further includes multiple stiffeners, with stiffeners provided at the connection between the main shaft and the sampling head, and the stiffeners being connected to both the main shaft and the sampling head. In this embodiment, the sampling head is subjected to axial impact force from the main shaft during sampling; multiple stiffeners are provided at the connection between the main shaft and the sampling head to ensure the stability of the connection between the two.

[0036] In some embodiments, the belt-mounted sampling device further includes a coal flow sensing element, which is fixed to the frame and electrically connected to the brake to release the main shaft. (See reference...) Figure 1 When the coal conveyor belt starts conveying coal, the coal flow sensing element senses the coal flow and transmits a signal to the brake. The brake is released, and the drive mechanism drives the sampling head to rotate one revolution to complete the sampling. When the sampling head returns to the stationary point, the brake locks the main shaft, causing the sampling head to stop rotating.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A belt mid-section sampling device, characterized in that: It includes a frame, a drive mechanism, a sampling head, and a detection unit. The drive mechanism is mounted on the frame, and the sampling head is located above the belt and connected to the output end of the drive mechanism to rotate and sample. The detection unit is mounted on the frame for contact with the scraper of the rotating sampling head for detection.

2. The belt mid-section sampling device according to claim 1, characterized in that, The detection unit includes an electric cylinder and a limit switch. The electric cylinder is fixed on the frame, and the limit switch is connected to the output end of the electric cylinder to extend or retract. The sampling head rotates to sample, and the scraper contacts the extended end of the limit switch.

3. The belt mid-section sampling device according to claim 2, characterized in that, The limit switch is a oscillating pin switch.

4. The belt mid-section sampling device according to claim 3, characterized in that, The sampling head rotates to sample, and the scraper contacts a movable end of the pendulum needle of the pendulum switch, causing the pendulum needle to rotate until it separates from the scraper.

5. The belt mid-section sampling device according to claim 4, characterized in that, The contact length between the lower end face of the scraper and the upper end face of the oscillating needle is no more than 0.5 mm.

6. The belt mid-section sampling device according to any one of claims 1 to 5, characterized in that, The drive mechanism includes a motor, a coupling, a brake, and a main shaft. The motor is mounted on the frame, and the output end of the motor is connected to the main shaft through the coupling. The output end of the main shaft is connected to the sampling head. The brake is mounted on the frame and holds the main shaft to restrict its rotation.

7. The belt mid-section sampling device according to claim 6, characterized in that, The movable end of the main shaft passes through the sampling head and is fixedly connected to the sampling head to drive the sampling head to rotate. The movable end of the main shaft is rotatably fixed on the frame.

8. The belt mid-section sampling device according to claim 6, characterized in that, The drive mechanism also includes multiple stiffeners, which are provided at the connection between the main shaft and the sampling head, and are respectively connected to the main shaft and the sampling head.

9. The belt mid-section sampling device according to claim 6, characterized in that, The belt-mounted sampling device also includes a coal flow sensing element, which is fixed to the frame and electrically connected to the brake to release the main shaft.

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