A magnetically driven eddy current heating rake dryer with adjustable torque

Abstract

The present invention provides a magnetically driven eddy current heating rake dryer with adjustable torque, which relates to the technical field of drying equipment. The dryer comprises a cylinder, a rake stirring shaft is arranged in the cylinder to rotate fixedly via a bearing, an outer centrifugal magnet is movably arranged in the outer magnetic steel turntable, and the centrifugal spring pushes the outer centrifugal magnet to perform translational sliding close to the axial direction of the outer magnetic steel turntable without the action of external force, so that the relative position of the inner magnet and the outer centrifugal magnet changes, and finally adjusts the torque output from the outer magnetic steel turntable to the inner magnetic steel turntable; the outer magnetic steel turntable rotates at an accelerated speed, so that the outer centrifugal magnet further performs centrifugal motion until the magnetic coupling with the inner magnet is released. The present invention utilizes the centrifugal force generated during the rotation of the outer magnetic steel turntable to push the outer centrifugal magnet to perform translational sliding, and finally adjusts the torque output from the outer magnetic steel turntable to the inner magnetic steel turntable, which can reduce the problem of mechanical structure damage caused by torque impact and greatly ensure the safety of the device.

Description

Technical Field

[0001] The invention relates to the technical field of drying equipment, in particular to a magnetically driven eddy current heating rake dryer with adjustable torque. Background Art

[0002] The prior art discloses a rake assembly with the publication number "CN208091190U" and a rake vacuum dryer using the rake assembly, which belong to the field of drying equipment and aim to provide a rake assembly that prevents materials from accumulating on the rake arms. The key points of the technical solution are as follows: a rake assembly comprising a hollow rake main shaft arranged in a cylinder, wherein the rake main shaft is staggered and fixedly connected with several rows of rake arms, and the end of the rake arm away from the rake main shaft is fixedly connected with a rake scraper that fits the inner wall of the cylinder, and the rows of the rake arms divide the cylinder into several sector-shaped areas, wherein a cleaning rod is provided in the sector-shaped area, and the axis of the cleaning rod is parallel to the rake main shaft. The device is suitable for drying slurry, paste and powder materials.

[0003] However, the above-mentioned device still has obvious defects during use: the above-mentioned device connects the rake-type rotating shaft to the rotating motor through a coupling. Although this transmission method is relatively common, it will affect the sealing of the device, have high requirements on the straightness of the transmission shaft, and is not conducive to buffering and shock absorption. Although there is a non-contact transmission method using a magnetic transmission shaft in the prior art, the magnets inside the existing magnetic rotating shaft are usually fixedly arranged, and the torque cannot be adjusted during operation. When the magnetic turntables on both sides rotate asynchronously, a large torque may be output, thereby causing a torque shock to the transmission shaft on the driving side, thereby causing damage to the device. Summary of the Invention

[0004] The object of the present invention is to provide a magnetically driven eddy current heating rake dryer with adjustable torque to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A magnetically driven, torque-adjustable eddy current heating rake dryer comprises a cylinder, a front cover integrally welded to one side of the cylinder, a sealing cover fixedly mounted on the outside of the cylinder on one side of the front cover, a rake stirring shaft rotatably arranged in the cylinder via a bearing, the rake stirring shaft being located on one side of the sealing cover and connected to an inner magnetic steel turntable via a first coupling, an outer magnetic steel turntable correspondingly disposed on the outside of the sealing cover and magnetically cooperating with the inner magnetic steel turntable, the outer magnetic steel turntable being connected to a drive motor via a second coupling;

[0007] The inner magnetic steel turntable is provided with an inner magnet fixedly arranged therein, and the outer centrifugal magnet is movably arranged therein. The outer centrifugal magnet is also fixedly connected to a centrifugal spring. The centrifugal spring pushes the outer centrifugal magnet to perform a translational sliding movement close to the axis of the outer magnetic steel turntable in the absence of an external force. The outer centrifugal magnet generates a centrifugal force during the rotation of the outer magnetic steel turntable and then performs a centrifugal translational movement away from the axis. During the centrifugal movement of the outer centrifugal magnet, the relative positions of the inner magnet and the outer centrifugal magnet change, thereby affecting the magnetic coupling strength between the two, and ultimately adjusting the torque output from the outer magnetic steel turntable to the inner magnetic steel turntable.

[0008] The outer magnetic steel turntable is also provided with a decoupling pin for fixing and limiting the outer centrifugal magnet, and the outer centrifugal magnet is provided with a pin hole for inserting the decoupling pin. When the inner magnetic steel turntable is in an emergency braking state, the outer magnetic steel turntable is accelerated to rotate so that the outer centrifugal magnet further performs centrifugal motion until the magnetic coupling with the inner magnet is released. At this time, the outer centrifugal magnet is limited by the decoupling pin, thereby reducing the transmission correlation between the outer magnetic steel turntable and the inner magnetic steel turntable.

[0009] Preferably, during the centrifugal movement of the outer centrifugal magnet from the extreme position close to the axis toward the side away from the axis, the magnetic coupling strength between the inner magnet and the outer centrifugal magnet gradually decreases.

[0010] Preferably, the number of the inner magnets and outer centrifugal magnets is 2N, where N≥1, and the inner magnets and outer centrifugal magnets are arranged alternately in the corresponding inner magnetic steel turntable and outer magnetic steel turntable, and adjacent inner magnets and outer centrifugal magnets are separated by partitions.

[0011] Preferably, the number of the inner magnets and the outer centrifugal magnets are both 8, and the centrifugal springs are fixedly mounted on the elastic force adjustment plate on the side away from the outer centrifugal magnet. The elastic force adjustment plate is arranged in the outer magnetic steel turntable for translational sliding. The elastic force adjustment plate is also provided with a threaded hole for inserting a threaded rod. One end of the threaded rod extends to the outside of the outer magnetic steel turntable and is connected to the rotating mechanism. The threaded rod is driven to rotate by the rotating mechanism, thereby driving the elastic force adjustment plate to translate and slide. The light rod section of the threaded rod is also inserted into the sliding rod hole opened by the outer centrifugal magnet, and the outer centrifugal magnet translates and slides along the length direction of the threaded rod.

[0012] Preferably, the rotating mechanism that drives the threaded rod to rotate is a manual wheel or a rotating motor.

[0013] Preferably, a translation slider is installed on one side of the external centrifugal magnet and the elastic force adjustment plate, and the translation slider cooperates with a slide groove provided on the external magnetic steel turntable.

[0014] Preferably, the decoupling pin used to fix and limit the external centrifugal magnet is movably inserted in a spring sleeve, and an extrusion spring is also sleeved on the outside of the decoupling pin. The extrusion spring is used to push the decoupling pin to rest against the surface of the external centrifugal magnet in the absence of external force, and a plug-in block is also installed on the end of the decoupling pin away from the external centrifugal magnet.

[0015] Preferably, the cylinder is further provided with a feed port and a discharge port.

[0016] Preferably, a heating coil is wound around the outside of the cylinder, and the heating coil is electrically connected to a coil energizer, and the coil energizer is electrically connected to a power supply.

[0017] Preferably, the cylinder, driving motor, coil energizer and power supply are all fixedly mounted on corresponding support seats.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts a non-contact magnetic transmission method to drive the rake-type stirring shaft to rotate. Compared with the traditional magnetic transmission shaft, the centrifugal force generated during the rotation of the outer magnetic steel turntable is used to push the outer centrifugal magnet to slide horizontally. The relative positions of the inner magnet and the outer centrifugal magnet are changed, thereby affecting the magnetic coupling strength between the two, and finally adjusting the torque output from the outer magnetic steel turntable to the inner magnetic steel turntable. It can prevent the outer magnetic steel turntable and the inner magnetic steel turntable from rotating out of sync and timely reduce the problem of mechanical structure damage caused by torque impact, thereby greatly ensuring the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic side view of the overall structure of the present invention;

[0022] Figure 3 It is a schematic cross-sectional view of the internal structure of the cylinder of the present invention;

[0023] Figure 4 This is a schematic diagram of the state where the magnetic coupling strength between the outer centrifugal magnet and the inner magnet of the present invention is maximum;

[0024] Figure 5 This is a schematic diagram of the state where the magnetic coupling strength between the outer centrifugal magnet and the inner magnet of the present invention is minimum;

[0025] Figure 6 This is a schematic diagram of the internal connection structure of the inner magnetic steel turntable of the present invention.

[0026] In the figure: 1 cylinder, 2 front cover, 3 sealing cover, 4 bearing, 5 rake stirring shaft, 6 coupling 1, 7 inner magnetic steel turntable, 8 outer magnetic steel turntable, 9 coupling 2, 10 drive motor, 11 inner magnet, 12 outer centrifugal magnet, 13 centrifugal spring, 14 decoupling latch, 15 partition, 16 elastic adjustment plate, 17 threaded rod, 18 manual wheel, 19 rotating motor, 20 translation slider, 21 slide, 22 spring sleeve, 23 extrusion spring, 24 plug-in block, 25 feed port, 26 discharge port, 27 heating coil, 28 coil power supply, 29 power supply, 30 support base. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0028] See also Figure 1-6 , the present invention provides a technical solution:

[0029] Example 1:

[0030] A magnetically driven, torque-adjustable eddy current heating rake dryer comprises a cylinder 1, a front cover 2 integrally welded to one side of the cylinder 1, a sealing cover 3 fixedly mounted on the outside of the cylinder 1 on one side of the front cover 2, a rake stirring shaft 5 rotatably disposed within the cylinder 1 via a bearing 4, the rake stirring shaft 5 being located on one side of the sealing cover 3 and connected to an inner magnetic steel turntable 7 via a coupling 1 6, an outer magnetic steel turntable 8 correspondingly disposed on the outside of the sealing cover 3 and magnetically cooperating with the inner magnetic steel turntable 7, the outer magnetic steel turntable 8 being connected to a drive motor 10 via a coupling 2 9;

[0031] Inner magnets 11 are fixedly arranged in the inner magnetic steel turntable 7, and outer centrifugal magnets 12 are movably arranged in the outer magnetic steel turntable 8. The outer centrifugal magnets 12 are also fixedly connected to the centrifugal springs 13. The centrifugal springs 13 push the outer centrifugal magnets 12 to slide translationally close to the axial direction of the outer magnetic steel turntable 8 without the action of external force. The outer centrifugal magnets 12 generate centrifugal force during the rotation of the outer magnetic steel turntable 8 and then perform centrifugal translational motion away from the axial direction. During the centrifugal motion of the outer centrifugal magnets 12, the relative positions of the inner magnets 11 and the outer centrifugal magnets 12 change, thereby affecting the magnetic coupling strength between the two, and ultimately adjusting the torque output from the outer magnetic steel turntable 8 to the inner magnetic steel turntable 7;

[0032] The outer magnetic steel turntable 8 is also provided with a decoupling pin 14 for fixing and limiting the outer centrifugal magnet 12. The outer centrifugal magnet 12 is provided with a pin hole for inserting the decoupling pin 14. When the inner magnetic steel turntable 7 is in an emergency braking state, the outer magnetic steel turntable 8 rotates faster, causing the outer centrifugal magnet 12 to further perform centrifugal motion until the magnetic coupling with the inner magnet 11 is released. At this time, the outer centrifugal magnet 12 is limited by the decoupling pin 14, thereby reducing the transmission correlation between the outer magnetic steel turntable 8 and the inner magnetic steel turntable 7.

[0033] In this embodiment, the cylinder 1 is used to hold the material to be dried, and the material is loaded and unloaded through the feed port 25 and the discharge port 26 opened on the cylinder 1. The material is turned over in the cylinder 1 by the rotation of the rake-type stirring shaft 5, and the internal material is heated by the heating coil 27 arranged outside the cylinder 1. The rake-type stirring shaft 5 is connected to the inner magnetic steel turntable 7, and the drive motor 10 is connected to the outer magnetic steel turntable 8. The inner magnetic steel turntable 7 and the outer magnetic steel turntable 8 are connected by a non-contact magnetic method. Different from the prior art, the outer magnetic steel turntable 8 is movably arranged with an outer magnetic steel turntable. The outer centrifugal magnet 12 is also fixedly connected to the centrifugal spring 13. The centrifugal spring 13 pushes the outer centrifugal magnet 12 to slide in the direction of the axis of the outer magnetic steel turntable 8 without external force. The centrifugal force generated by the outer magnetic steel turntable 8 during rotation can automatically adjust the torque between the inner magnetic steel turntable 7 and the outer magnetic steel turntable 8. During the centrifugal movement of the outer centrifugal magnet 12 from the extreme position close to the axis to the side away from the axis, the magnetic coupling strength between the inner magnet 11 and the outer centrifugal magnet 12 gradually decreases. The outer magnetic steel turntable 8 and the inner magnetic steel turntable 7 are in a stationary state. The magnetic coupling strength is the largest. The advantage of this arrangement is that a large torque needs to be output when starting in a stationary state in order to stably drive the rake stirring shaft 5 to rotate. At the same time, during the high-speed rotation of the outer magnetic steel turntable 8 and the inner magnetic steel turntable 7, the transmission process no longer needs to output a large torque. The equipment can maintain normal operation by relying on its own inertia and small torque. At this time, if the equipment is emergency braked, the impact torque transmitted to the outer magnetic steel turntable 8 is also small, thereby playing a good buffering role. At the same time, when the equipment in the cylinder 1 is damaged or emergency brake is required, it is necessary to stop as soon as possible. The magnetic coupling between the outer magnetic steel turntable 8 and the inner magnetic steel turntable 7 is cut off. At this time, by increasing the rotation speed of the outer magnetic steel turntable 8, the outer centrifugal magnet 12 can be further translated to the side away from the axis, and finally limited by the decoupling pin 14. At this time, since the outer centrifugal magnet 12 has deviated far from the coordination with the inner magnet 11, the magnetic coupling strength between the two is greatly reduced, thereby achieving the protection of the outer magnetic steel turntable 8 and the drive motor 10. The above-mentioned torque adjustment method cleverly utilizes the centrifugal force generated during the rotation process, and is continuously adjusted as the rotation speed changes.

[0034] Example 2:

[0035] The number of the inner magnets 11 and the outer centrifugal magnets 12 is 2N, where N≥1. The inner magnets 11 and the outer centrifugal magnets 12 are arranged alternately in the corresponding inner magnetic steel turntable 7 and the outer magnetic steel turntable 8, and adjacent inner magnets 11 and outer centrifugal magnets 12 are separated by partitions 15.

[0036] The number of inner magnets 11 and outer centrifugal magnets 12 is 8 respectively. The centrifugal springs 13 are fixedly mounted on the elastic force adjustment plate 16 on the side away from the outer centrifugal magnet 12. The elastic force adjustment plate 16 is arranged to slide in the outer magnetic steel turntable 8. A threaded hole for inserting a threaded rod 17 is also provided on the elastic force adjustment plate 16. One end of the threaded rod 17 extends to the outside of the outer magnetic steel turntable 8 and is connected to the rotating mechanism. The threaded rod 17 is driven to rotate by the rotating mechanism, thereby driving the elastic force adjustment plate 16 to slide in translation. The light rod section of the threaded rod 17 is also inserted into the sliding rod hole opened in the outer centrifugal magnet 12, and the outer centrifugal magnet 12 slides in translation along the length direction of the threaded rod 17.

[0037] In this embodiment, the elastic force of the centrifugal spring 13 can be adjusted by setting the elastic force adjustment plate 16, so that the magnetic coupling between the external centrifugal magnet 12 and the internal magnet 11 as the speed changes is more controllable, thereby ensuring safety and reliability during operation. Among them, a translation slider 20 is installed on one side of the external centrifugal magnet 12 and the elastic force adjustment plate 16, and the translation slider 20 cooperates with the slide groove 21 opened on the external magnetic steel turntable 8. Through the cooperation of the translation slider 20 and the slide groove 21, the stability of the two during the translation sliding process is guaranteed.

[0038] Example 3:

[0039] The rotating mechanism for driving the threaded rod 17 to rotate is a manual wheel 18 or a rotating motor 19 .

[0040] The elastic force of the centrifugal spring 13 is adjusted by a manual wheel 18 or a rotating motor 19. Preferably, the rotating motor 19 is used to facilitate the adjustment of the elastic force adjustment plate 16 during high-speed rotation, so that the external centrifugal magnet 12 can be more easily matched with the decoupling pin 14, thereby improving the safety of the device in an emergency.

[0041] Example 4:

[0042] The decoupling latch 14 for fixing and limiting the outer centrifugal magnet 12 is movably inserted in the spring sleeve 22. An extrusion spring 23 is also sleeved on the outside of the decoupling latch 14. The extrusion spring 23 is used to push the decoupling latch 14 to move against the surface of the outer centrifugal magnet 12 in the absence of external force. An insertion block 24 is also installed on the end of the decoupling latch 14 away from the outer centrifugal magnet 12.

[0043] This embodiment further discloses the connection structure of the decoupling latch 14, which is pushed into engagement with the latch hole of the outer centrifugal magnet 12 by the elastic force generated by the compression spring 23, and can be brought into contact with the limit by manually pulling the plug block 24.

[0044] Example 4:

[0045] The heating coil 27 is also electrically connected to the coil energizer 28 , and the coil energizer 28 is electrically connected to the power supply 29 ; the cylinder 1 , the drive motor 10 , the coil energizer 28 and the power supply 29 are all fixedly mounted on corresponding support bases 30 .

[0046] In this embodiment, the heating coil 27 is electrically connected to a coil power supply 28 so as to adjust the heating power of the heating coil 27 and is powered by a power supply 29 .

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A magnetically driven eddy current heating rake dryer with adjustable torque, comprising a cylinder, a front cover integrally welded to one side of the cylinder, a sealing cover fixedly mounted on the outside of the cylinder on one side of the front cover, a rake stirring shaft rotatably arranged in the cylinder via a bearing, the rake stirring shaft being located on one side of the sealing cover and connected to an inner magnetic steel turntable via a first coupling, an outer magnetic steel turntable correspondingly arranged on the outside of the sealing cover and magnetically cooperating with the inner magnetic steel turntable, the outer magnetic steel turntable being connected to a drive motor via a second coupling, characterized in that: The inner magnetic steel turntable is provided with an inner magnet fixedly arranged therein, and the outer centrifugal magnet is movably arranged therein. The outer centrifugal magnet is also fixedly connected to a centrifugal spring. The centrifugal spring pushes the outer centrifugal magnet to perform a translational sliding movement close to the axis of the outer magnetic steel turntable in the absence of an external force. The outer centrifugal magnet generates a centrifugal force during the rotation of the outer magnetic steel turntable and then performs a centrifugal translational movement away from the axis. During the centrifugal movement of the outer centrifugal magnet, the relative positions of the inner magnet and the outer centrifugal magnet change, thereby affecting the magnetic coupling strength between the two, and ultimately adjusting the torque output from the outer magnetic steel turntable to the inner magnetic steel turntable. The outer magnetic steel turntable is also provided with a decoupling pin for fixing and limiting the outer centrifugal magnet, and the outer centrifugal magnet is provided with a pin hole for inserting the decoupling pin. When the inner magnetic steel turntable is in an emergency braking state, the outer magnetic steel turntable is accelerated to rotate so that the outer centrifugal magnet further performs centrifugal motion until the magnetic coupling with the inner magnet is released. At this time, the outer centrifugal magnet is limited by the decoupling pin, thereby reducing the transmission correlation between the outer magnetic steel turntable and the inner magnetic steel turntable.

2. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 1, characterized in that: During the centrifugal movement of the outer centrifugal magnet from the extreme position close to the axis to the side away from the axis, the magnetic coupling strength between the inner magnet and the outer centrifugal magnet gradually decreases.

3. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 2, characterized in that: The number of the inner magnets and outer centrifugal magnets is 2N, where N≥1. The inner magnets and outer centrifugal magnets are arranged alternately in the corresponding inner magnetic steel turntable and outer magnetic steel turntable, and adjacent inner magnets and outer centrifugal magnets are separated by partitions.

4. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 3, characterized in that: The number of the inner magnets and the outer centrifugal magnets is 8 each. The centrifugal spring is fixedly mounted on the elastic force adjustment plate on the side away from the outer centrifugal magnet. The elastic force adjustment plate is arranged in the outer magnetic steel turntable for translational sliding. The elastic force adjustment plate is also provided with a threaded hole for inserting a threaded rod. One end of the threaded rod extends to the outside of the outer magnetic steel turntable and is connected to the rotating mechanism. The threaded rod is driven to rotate by the rotating mechanism, thereby driving the elastic force adjustment plate to translate and slide. The light rod section of the threaded rod is also inserted into the sliding rod hole provided in the outer centrifugal magnet. The outer centrifugal magnet translates and slides along the length direction of the threaded rod.

5. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 4, characterized in that: The rotating mechanism for driving the threaded rod to perform rotational motion is a manual wheel or a rotating motor.

6. A magnetically driven eddy current heating rake dryer with adjustable torque according to any one of claims 1 to 5, characterized in that: A translation slider is installed on one side of the external centrifugal magnet and the elastic force adjustment plate, and the translation slider cooperates with a slide groove provided on the external magnetic steel turntable.

7. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 6, characterized in that: The decoupling latch is used to fix and limit the external centrifugal magnet and is movably inserted in the spring sleeve. An extrusion spring is also sleeved on the outside of the decoupling latch. The extrusion spring is used to push the decoupling latch to move against the surface of the external centrifugal magnet in the absence of external force. A plug-in block is also installed on the end of the decoupling latch away from the external centrifugal magnet.

8. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 7, characterized in that: The cylinder is also provided with a feed port and a discharge port.

9. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 8, characterized in that: A heating coil is wound around the outside of the cylinder, and the heating coil is electrically connected to a coil energizer, and the coil energizer is electrically connected to a power source.

10. The magnetically driven eddy current heating rake dryer with adjustable torque according to claim 9, characterized in that: The cylinder, driving motor, coil energizer and power supply are all fixedly mounted on corresponding supporting seats.

Images