Eddy current brake type belt conveyor vertical tension buffering device

Abstract

The utility model discloses a vortex braking formula belt conveyor vertical tension buffer device, and the device includes vertical tension stand and counterweight box, and the vertical tension stand is equipped with vertical vortex generation rib plate along the radial of outer periphery, and the vortex generation rib plate height is same with vertical tension stand height, and the vertical tension stand is 2, and the mirror image symmetry is arranged in the both sides of counterweight box, the counterweight box bottom is connected with fixed frame, and the fixed frame includes a plurality of recesses with vortex generation rib plate cooperation, and the inner wall both sides of each recess are equipped with the permanent magnet patch of different name magnetic pole arrangement, the part that vortex generation rib plate extends outward is located in the inner recess space of fixed frame recess, and there is fixed gap between recess inner wall and permanent magnet patch, when the counterweight box falls vertically, and vortex generation rib plate cuts the magnetic induction line and produces resistance, effectively reduces the falling speed of counterweight box, and reduces the ground impact force, and the device cooperates with original flexible buffer device, can effectively protect building structure and tension device.

Description

Technical Field

[0001] This utility model relates to the field of safety protection technology for coal transportation systems in thermal power plants, specifically to a vertical tensioning buffer device for eddy current brake belt conveyors. Background Technology

[0002] The vertical tensioning device for belt conveyors is a key component of the conveyor belt in the coal conveying system of thermal power plants. It automatically adjusts the conveyor belt tension using gravity and is indispensable for ensuring the stable operation of the conveyor equipment. The safety of the conveyor belt is directly related to the power plant's production efficiency and operational safety. In actual operation, there is a risk that the conveyor belt may break due to material accumulation, mechanical failure, or external impact (belt breakage accident). A broken belt will cause the counterweight box of the vertical tensioning device to fall vertically.

[0003] When a tensioning device is installed inside a building, the impact force generated when the counterweight box hits the ground can damage the building structure and destroy the tensioning device. To mitigate this impact, the industry commonly deploys spring-loaded flexible buffer devices at the bottom of the counterweight box or on the ground. These devices work by absorbing impact energy through spring deformation. However, this solution is ineffective: at the moment the counterweight box hits the ground, the energy absorbed by the spring is limited, and a large amount of undissipated energy causes the device to rebound, creating a secondary impact that damages both the building structure and the tensioning device. Therefore, in addition to configuring a spring-loaded flexible buffer device, effective cushioning is needed during the counterweight box's descent to reduce its falling speed in order to effectively protect the building structure and the tensioning device. Utility Model Content

[0004] The purpose of this utility model application is to address the shortcomings of the above-mentioned technology by providing an eddy current braking type vertical tensioning buffer device for belt conveyors. The magnetic field generated by the eddy current generating rib cutting magnetic field lines interacts with the magnetic field of the permanent magnet patch to generate resistance, which slows down the falling speed of the counterweight box during its descent, thereby reducing the impact force when the counterweight box hits the ground. This device, in conjunction with the original spring unloading type flexible buffer device, effectively protects the building structure and the tensioning device.

[0005] To achieve the above objectives, the eddy current brake type vertical tensioning buffer device for belt conveyors provided by this utility model adopts the following technical solution:

[0006] An eddy current brake type belt conveyor vertical tensioning buffer device includes a vertical tensioning column and a counterweight box. The vertical tensioning column has vertical eddy current generating ribs radially arranged on its outer periphery. The height of the eddy current generating ribs is the same as the height of the vertical tensioning column. There are two vertical tensioning columns, mirror-symmetrically arranged on both sides of the counterweight box. The bottom of the counterweight box is connected to a fixing frame. The fixing frame includes multiple grooves that mate with the eddy current generating ribs. Each groove has permanent magnet patches with opposite magnetic poles arranged on two opposite sides of its inner wall. The outwardly extending portion of the eddy current generating rib is located within the concave space of the groove in the fixing frame, and there is a fixed gap between the rib and the inner wall of the groove and the permanent magnet patches. By employing this technical solution, when the counterweight box falls vertically, relative motion occurs between the eddy current generating rib and the permanent magnet patch. The eddy current generating rib cuts the magnetic field lines between the permanent magnet patches, generating eddy currents. The magnetic field of these eddy currents interacts with the magnetic field of the permanent magnet patches, generating resistance (Ampere force) in the opposite direction of motion, thereby slowing down the falling speed of the counterweight box. The greater the relative speed between the eddy current generating rib and the permanent magnet patch, the stronger the magnetic induction intensity, and the greater the resistance generated; that is, the magnitude of the resistance is directly proportional to the relative speed.

[0007] Optionally, the eddy current generating rib includes a first eddy current generating rib and a second eddy current generating rib. The first and second eddy current generating ribs are symmetrically arranged on both sides of the outer periphery of the vertical tensioning column, and the included angle between the first and second eddy current generating ribs is 180°. By adopting this technical solution, the installation and positioning of the first and second eddy current generating ribs are simplified, and the symmetrical distribution of the eddy current generating ribs on both sides of the column ensures lateral force balance.

[0008] Optionally, the permanent magnet patch includes a first permanent magnet patch and a second permanent magnet patch, and the distance between the eddy current generating rib and both the first and second permanent magnet patches is the same. By adopting this technical solution, the magnetic field generated by the eddy current generating rib cutting magnetic field lines is a symmetrical magnetic field. The symmetrical magnetic field enables a more uniform temperature distribution on the surface of the eddy current generating rib and also improves the energy conversion efficiency.

[0009] Optionally, both the first permanent magnet patch and the second permanent magnet patch are arranged with alternating S and N poles.

[0010] Optionally, the vertical tensioning column is provided with multiple heat dissipation ribs on its outer periphery. This technical solution facilitates heat dissipation through eddy current generation via the ribs.

[0011] Optionally, the heat dissipation ribs are all radially arranged along the outer periphery of the vertical tensioning column, and their height is the same as that of the vertical tensioning column. This technical solution facilitates the installation and positioning of the heat dissipation ribs.

[0012] Optionally, the heat dissipation ribs are welded to the vertical tensioning column. This technical solution ensures a stable connection and facilitates installation.

[0013] Optionally, the fixing frame and the counterweight box are fixed by welding. This technical solution ensures a stable connection and facilitates installation.

[0014] Optionally, the permanent magnet patch is adhesively connected to the mounting bracket. This technical solution facilitates installation, subsequent maintenance, and component replacement.

[0015] Optionally, the eddy current generating rib is welded to the vertical tensioning column. This technical solution ensures a stable connection and facilitates installation.

[0016] The beneficial effects achieved by this utility model are:

[0017] 1. When the counterweight box falls vertically, the eddy current generation ribs cut the magnetic field lines to generate eddy currents. The magnetic field of these eddy currents interacts with the magnetic field of the permanent magnet patch, generating resistance (Ampere force) in the opposite direction of motion, effectively reducing the falling speed of the counterweight box and thus reducing the impact force when the counterweight box hits the ground. This device, in conjunction with the original spring-loaded flexible buffer device, can effectively protect the building structure and tensioning device.

[0018] 2. Since the magnitude of the resistance is directly proportional to the relative speed of motion, the faster the counterweight box falls, the stronger the deceleration effect. Therefore, this device has good adaptive braking capability.

[0019] 3. The device has a simple structure, is easy to install, and has low maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a top-view cross-sectional diagram of the present invention;

[0022] The components include: 1. Vertical tensioning column; 2. Counterweight box; 3. Fixing frame; 4. Permanent magnet patch; 41. First permanent magnet patch; 42. Second permanent magnet patch; 5. Eddy current generating rib; 51. First eddy current generating rib; 52. Second eddy current generating rib; 6. Heat dissipation rib; 7. Flexible buffer device; 8. Tensioning roller; 9. Tensioning roller fixing frame. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] The following is in conjunction with the appendix Figures 1-2 The present invention will be described in further detail below.

[0026] like Figure 1 , Figure 2 As shown, the eddy current brake belt conveyor vertical tension buffer device includes a vertical tension column 1 and a counterweight box 2. The outer periphery of the vertical tension column 1 is provided with vertical eddy current generating ribs 5 along the radial direction. The height of the eddy current generating ribs 5 is the same as the height of the vertical tension column 1. There are two vertical tension columns 1 in total, which are mirror-symmetrically arranged on both sides of the counterweight box 2. The bottom of the counterweight box 2 is connected to a fixing frame 3. The fixing frame 3 includes multiple grooves that cooperate with the eddy current generating ribs 5. The inner wall of each groove is provided with permanent magnet patches 4 with opposite magnetic poles arranged on both sides. The outwardly extending part of the eddy current generating ribs 5 is located in the concave space of the grooves of the fixing frame 3, and there is a fixed gap between the ribs 5 and the inner wall of the grooves and the permanent magnet patches 4. When the permanent magnet patches 4 and the eddy current generating ribs 5 move relative to each other, the fixed gap does not change.

[0027] The eddy current generating rib 5 includes a first eddy current generating rib 51 and a second eddy current generating rib 52. The first eddy current generating rib 51 and the second eddy current generating rib 52 are symmetrically arranged on both sides of the outer periphery of the vertical tensioning column 1, and the included angle between the first eddy current generating rib 51 and the second eddy current generating rib 52 is 180°. The permanent magnet patch 4 includes a first permanent magnet patch 41 and a second permanent magnet patch 42. The distance between the eddy current generating rib 5 and the first permanent magnet patch 41 and the second permanent magnet patch 42 is the same. In this embodiment, the first permanent magnet patch 41 and the second permanent magnet patch 42 are arranged with alternating S poles and N poles. Multiple heat dissipation ribs 6 are provided on the outer periphery of the vertical tensioning column 1. The heat dissipation ribs 6 are all arranged radially on the outer periphery of the vertical tensioning column 1, and their height is the same as the height of the vertical tensioning column 1. In this embodiment, each vertical tensioning column 1 has 7 heat dissipation ribs 6 on its outer periphery.

[0028] The heat dissipation fin 6 is welded to the vertical tensioning column 1. The mounting bracket 3 is welded to the counterweight box 2. The permanent magnet patch 4 is glued to the mounting bracket 3. The eddy current generating fin 5 is welded to the vertical tensioning column 1.

[0029] like Figure 1 As shown, the tensioning roller 8 is used to tension the conveyor belt. The tensioning roller 8 is connected to the tensioning roller fixing frame 9, and the counterweight box 2 is connected to the tensioning roller fixing frame 9. The tensioning roller fixing frame 9 can slide up and down along the vertical tensioning column 1. The flexible buffer device 7 is set on the floor surface directly below the counterweight box 2 and is fixedly connected to the floor surface foundation.

[0030] In this embodiment, the eddy current generating rib 5 has a thickness of not less than 8 mm and is made of a conductor material. The permanent magnet patch 4 has a remanence of not less than 0.9 Tesla and a coercivity of ≥750 kA / m.

[0031] The implementation principle of this utility model embodiment is as follows: There are magnetic field lines between the first permanent magnet patch 41 and the second permanent magnet patch 42. When the conveyor belt breaks, the tension roller 8 and the tension roller fixing frame 9 will cause the counterweight box 2 to fall vertically. The eddy current generating rib 5 and the permanent magnet patch 4 will move relative to each other in a vertical direction. The eddy current generating rib 5 cuts the magnetic field lines between the first permanent magnet patch 41 and the second permanent magnet patch 42, resulting in the generation of induced currents with closed eddy currents inside the eddy current generating rib 5. According to Lenz's law, the magnetic field generated by the eddy current always opposes the change of the original magnetic field. Therefore, when the eddy current generating rib 5 and the permanent magnet patch 4 move relative to each other, the magnetic field of the eddy current in the eddy current generating rib 5 interacts with the magnetic field of the permanent magnet patch 4, generating a resistance (Ampere force) opposite to the direction of motion, consuming kinetic energy and converting it into heat energy. The magnitude of the resistance is directly proportional to the magnetic induction intensity, the relative speed of the ribs, and the conductivity of the ribs. When the counterweight box 2 falls vertically due to gravity, its falling speed increases due to gravitational acceleration. The faster the counterweight box 2 falls, the faster the relative speed between the eddy current generating rib 5 and the permanent magnet patch 4, and the greater the resistance generated by the eddy current generating rib 5. This effectively slows down the falling speed of the counterweight box 2, reduces the impact force when the counterweight box 2 contacts the flexible buffer device 7, and ultimately reduces the impact on the floor surface, effectively protecting the building structure and the tensioning device. The heat energy converted from the kinetic energy consumed during the process is diffused into the atmosphere through the heat dissipation rib 6.

[0032] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims.

[0033] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and the above structures should all be considered to fall within the protection scope of this utility model.

Claims

1. A vertical tensioning buffer device for an eddy current brake belt conveyor, comprising a vertical tensioning column (1) and a counterweight box (2), characterized in that: The vertical tensioning column (1) has a vertical vortex generating rib (5) on its outer periphery along the radial direction. The height of the vortex generating rib (5) is the same as the height of the vertical tensioning column (1). There are two vertical tensioning columns (1) in total, which are mirror-symmetrically arranged on both sides of the counterweight box (2). The bottom of the counterweight box (2) is connected to the fixed frame (3). The fixed frame (3) includes multiple grooves that cooperate with the eddy current generating rib (5). Each groove has permanent magnet patches (4) with opposite magnetic poles arranged on both sides of its inner wall. The outwardly extending portion of the eddy current generating rib (5) is located within the concave space of the groove of the fixing frame (3), and there is a fixed gap between it and the inner wall of the groove and the permanent magnet patch (4).

2. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 1, characterized in that: The vortex generating rib (5) includes a first vortex generating rib (51) and a second vortex generating rib (52). The first vortex generating rib (51) and the second vortex generating rib (52) are symmetrically arranged on both sides of the outer periphery of the vertical tension column (1), and the included angle between the first vortex generating rib (51) and the second vortex generating rib (52) is 180°.

3. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 1, characterized in that: The permanent magnet patch (4) includes a first permanent magnet patch (41) and a second permanent magnet patch (42), and the distance between the eddy current generating rib (5) and the first permanent magnet patch (41) and the second permanent magnet patch (42) is the same.

4. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 3, characterized in that: Both the first permanent magnet patch (41) and the second permanent magnet patch (42) are arranged with alternating S and N poles.

5. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 1, characterized in that: The vertical tensioning column (1) has multiple heat dissipation ribs (6) on its outer periphery.

6. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 5, characterized in that: The heat dissipation ribs (6) are all arranged radially along the outer periphery of the vertical tensioning column (1), and their height is the same as that of the vertical tensioning column (1).

7. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 5, characterized in that: The heat dissipation rib (6) is fixed to the vertical tensioning column (1) by welding.

8. The eddy current brake type vertical tension buffer device for belt conveyors according to claim 1, characterized in that: The fixing frame (3) and the counterweight box (2) are fixed by welding.

9. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 1, characterized in that: The permanent magnet patch (4) and the fixing frame (3) are connected by adhesive.

10. The eddy current brake type vertical tensioning buffer device for belt conveyors according to claim 1, characterized in that: The eddy current generating rib (5) is fixed to the vertical tensioning column (1) by welding.

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