Conveying equipment detection mechanism

Abstract

The utility model provides a conveying equipment detection mechanism, a shaft end of a load shaft is provided with a Hall sensor, a permanent magnet and an inductor of the Hall sensor are respectively arranged on the shaft end of the load shaft and a rack of conveying equipment, and a signal end of the inductor outputs a rotating speed pulse signal. According to the utility model, the Hall sensor at the end of the load shaft is mainly used for directly measuring the rotating speed of the load shaft and detecting the rotating state of the load shaft, so that the detection accuracy is improved and the shutdown time is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment detection, in particular to a conveying equipment detection mechanism. Background Art

[0002] In metal smelting operations, star valves, scrapers and other equipment with rotating shafts are often used to transport materials. Star valves, scrapers and other conveying equipment generally connect the rotating shaft with the output shaft of the motor through a coupling and a reducer to obtain the driving force for conveying materials, and transmit the power to the load end of the star valve or scraper through components such as gears or chains. This type of conveying equipment needs to run uninterruptedly for a long time, and the equipment is in a harsh environment with high dust, high temperature and corrosive gases. Regular inspections are very difficult. If the equipment fails due to excessive load on the load end or chain breakage, and the inspection fails to discover it in time, it will become a production accident and cause production suspension, seriously affecting production operations.

[0003] In the prior art, in order to prevent the above accidents, a detection mechanism is usually set at the motor end of the power input of the conveying equipment such as the star valve and the scraper to detect whether the motor rotates normally, and the working state of the conveying equipment is judged by the rotation state of the motor. However, this detection scheme may make misjudgments in some cases. For example, when the connection of the coupling at the output shaft end of the motor fails, the conveying equipment may stop running while the motor is still rotating. The above detection scheme cannot effectively detect such failures, thus prolonging the downtime. Utility Model Content

[0004] The utility model aims to provide a conveying equipment detection mechanism, which can detect whether the conveying equipment works normally by detecting the rotation state of the load end of the conveying equipment.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a conveying equipment detection mechanism, a Hall sensor is provided at the shaft end of the load shaft of the star valve or scraper, the permanent magnet and the induction body of the Hall sensor are respectively installed on the shaft end of the load shaft and the frame of the conveying equipment, and the signal end of the induction body outputs a speed pulse signal.

[0006] The utility model mainly arranges a Hall sensor at the load shaft end of the conveying equipment, detects its rotation state by measuring the rotation speed of the load shaft, ensures that an alarm can be sent in time when the conveying equipment stops operating due to unexpected factors, improves detection accuracy, and reduces downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the detection principle of the Hall sensor;

[0008] Figure 2 , 3They are the front view and left view of the first half hoop and the second half hoop respectively;

[0009] Figure 4 , 5 They are the front view and right view of the connecting plate and the mounting plate respectively. DETAILED DESCRIPTION

[0010] See also Figures 1 to 5 In the conveying equipment detection mechanism shown, a Hall sensor is provided at the shaft end of the load shaft 1 of the star valve or scraper, and the permanent magnet 11 and the inductor 12 of the Hall sensor are respectively installed on the shaft end of the load shaft 1 and the frame of the conveying equipment, and the signal end of the inductor 12 outputs a speed pulse signal.

[0011] In the above scheme, the star valve, scraper and other conveying equipment are often in a harsh environment with high dust, high temperature and corrosive gas containing SO2 during metal smelting operations. The sensor used for equipment detection should be easy to disassemble and maintain, and can be applied to the harsh environment of metal smelting operations. Therefore, the sensor selection cannot use photoelectric sensors and encoders. The utility model preferably uses magnetic induction sensors, that is, Hall sensors, PNP transistor pulse output, which is suitable for high dust and high temperature smelting operation environments. Since the operating environment temperature is lower than the Curie temperature point of the magnet, the Hall sensor can work for a long time and is stable and reliable. In actual application, the permanent magnet 11 of the Hall sensor rotates synchronously with the load shaft 1 of the star valve or scraper. When the permanent magnet 11 is close to the induction body 12 fixed on the frame during rotation, the signal end of the induction body 12 will generate a speed pulse, and the speed of the load shaft 1 is calculated by the pulse frequency. In this solution, a Hall sensor is set at the shaft end of the load shaft 1 of the conveying equipment. Compared with the traditional solution of setting a sensor at the motor end to detect the motor speed, this solution can directly detect the rotation working state of the conveying equipment, avoiding interference factors such as couplings and other transmission mechanisms. The detection result is more accurate and reliable, and it can judge abnormal conditions such as broken chain and stall of the equipment and promptly alarm, effectively ensuring equipment safety and production efficiency.

[0012] When the Hall sensor is working, the speed pulse generated by the signal end of the induction body 12 is converted into the speed in the data acquisition system, and the speed signal is transmitted to the host computer system through the field bus. Then, the state of the conveying equipment is judged according to the algorithm logic in combination with the motor current signal and an alarm signal is generated to realize the alarm.

[0013] In order to prevent the installation of the Hall sensor from affecting the normal operation and safe operation of the original equipment and to facilitate disassembly and maintenance, a rotating shaft bracket is provided at the shaft end of the load shaft 1, and the permanent magnet 11 is fixedly installed on the rotating shaft bracket.

[0014] Preferably, when the axial end face of the load shaft 1 of the star valve or scraper is closed, the rotating shaft support is a pair of hoops, including a first half hoop 21 and a second half hoop 22 with a semicircular body enclosing the circumferential surface of the load shaft 1, the first half hoop 21 and the second half hoop 22 have the same radius and have a first connecting leg 211 and a second connecting leg 221 extending radially at both ends, an L-shaped support plate 23 extending radially at the outer end of the second connecting leg 221, and the permanent magnet 11 is fixedly mounted on the outer plate surface of the L-shaped support plate 23 away from the load shaft 1.

[0015] The structure of the rotating shaft support is easy to maintain. The first half hoop 21 and the second half hoop 22 are made of stainless steel or similar materials to ensure resistance to environmental corrosion. The diameters of the first half hoop 21 and the second half hoop 22 are designed according to the diameter of the load shaft 1. The two rings are fixed on the load shaft 1 and cannot be closed. Figure 2 , a gap of about 10% of the circumference of the load shaft 1 needs to be reserved between the first connecting leg 211 and the second connecting leg 221, and the two can be connected by bolts. The L-shaped support plate 23 can be fixed to the permanent magnet 11 by bonding or slotting. During installation, first fix the inductor 12 of the Hall sensor on the frame of the conveying equipment, and fix the permanent magnet 11 to the outer plate surface of the L-shaped support plate 23 away from the load shaft 1. The fixing method can be bonding or snapping. If the snapping method is adopted, it is necessary to design a groove on the outer plate surface of the L-shaped support plate 23 away from the load shaft 1, fix the permanent magnet 11 in the groove, and then use stainless steel material of the same material as the L-shaped support plate 23 to fix the permanent magnet 11 by welding. After the permanent magnet 11 is fixed, the clamp is installed on the load shaft 1, the clamp is tightened, and the lead of the inductor 12 of the Hall sensor is connected to the data acquisition system.

[0016] As another preferred embodiment, if there is space left at the axial end face of the load shaft 1 of the star valve or scraper, the rotating shaft bracket includes a connecting plate 24 connected to the axial end of the load shaft 1, and a mounting plate 25 extends from the edge of the connecting plate 24, and the two are combined into an L shape, and the permanent magnet 11 is fixed on the outer plate surface of the mounting plate 25 away from the load shaft 1.

[0017] refer to Figure 4 , Figure 5 During installation, the material of the connecting plate 24 and the mounting plate 25 can also be stainless steel or similar materials. Drill and tap the end axis of the load shaft 1 in advance, first fix the inductor 12 on the frame of the conveying equipment, and fix the permanent magnet 11 on the surface of the mounting plate 25, then fix the surface of the connecting plate 24 to the end surface of the load shaft 1 by bolts, and connect the lead of the inductor 12 to the data acquisition system.

[0018] To ensure that the signal end of the induction body 12 generates a speed pulse during the rotation of the permanent magnet 11, the position of the permanent magnet 11 closest to the induction body 12 during the rotation of the rotating shaft bracket is the measuring position, and the sensing surface 121 of the induction body 12 is directly opposite to the detection surface 111 of the permanent magnet 11 close to the induction body 12 in the measuring position.

[0019] In the above scheme, the radial extension length of the L-shaped support plate 23 or the connecting plate 24 depends on the distance between the permanent magnet 11 and the inductive body 12. It is necessary to ensure that the two do not interfere with each other when the permanent magnet 11 rotates, and at the same time ensure that the distance between the two is within the effective sensing distance. The sensing surface 121 is directly opposite to the detection surface 111 at the measuring position, which can make it easier for the permanent magnet 11 and the inductive body 12 at the measuring position to generate induction.

[0020] Preferably, the distance between the induction surface 121 of the induction body 12 and the detection surface 111 of the permanent magnet 11 at the measuring position is 3-7 mm, preferably 5 mm.

Claims

1. A conveying equipment detection mechanism, characterized in that: A Hall sensor is provided at the shaft end of a load shaft (1) of a star valve or a scraper, a permanent magnet (11) and an inductor (12) of the Hall sensor are respectively mounted on the shaft end of the load shaft (1) and a frame of a conveying device, and a signal end of the inductor (12) outputs a rotation speed pulse signal.

2. The conveying equipment detection mechanism according to claim 1, characterized in that: A rotating shaft bracket is provided at the shaft end of the load shaft (1), and the permanent magnet (11) is fixedly mounted on the rotating shaft bracket.

3. The conveying equipment detection mechanism according to claim 2, characterized in that: The rotating shaft support is a pair of hoops, comprising a first half hoop (21) and a second half hoop (22) with a semicircular main body enclosing the circumference of the load shaft (1); the first half hoop (21) and the second half hoop (22) have the same radius and have a first connecting leg (211) and a second connecting leg (221) extending radially at both ends; an L-shaped support plate (23) extending radially at the outer end of the second connecting leg (221); and the permanent magnet (11) is fixedly mounted on the outer plate surface of the L-shaped support plate (23) away from the load shaft (1).

4. The conveying equipment detection mechanism according to claim 2, characterized in that: The rotating shaft support comprises a connecting plate (24) whose plate surface is connected to the shaft end of the load shaft (1), and a mounting plate (25) extends from the edge of the connecting plate (24), and the two are combined into an L shape, and the permanent magnet (11) is fixed on the outer plate surface of the mounting plate (25) away from the load shaft (1).

5. The conveying equipment detection mechanism according to claim 2, 3 or 4, characterized in that: The position of the permanent magnet (11) closest to the induction body (12) during the rotation of the rotating shaft support is the measuring position, and the induction surface (121) of the induction body (12) is directly opposite to the detection surface (111) of the permanent magnet (11) close to the induction body (12) at the measuring position.

6. The conveying equipment detection mechanism according to claim 5, characterized in that: The distance between the induction surface (121) of the induction body (12) and the detection surface (111) of the permanent magnet (11) at the measuring position is 3 to 7 mm.

7. The conveying equipment detection mechanism according to claim 6, characterized in that: The distance between the induction surface (121) of the induction body (12) and the detection surface (111) of the permanent magnet (11) at the measuring position is 5 mm.

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