Damping carrier roller of downward belt conveyor

Abstract

The utility model relates to a damping carrier roller of a downward belt conveyor. The damping carrier roller comprises a roller skin and a carrier roller shaft, dimethicone damping liquid is arranged in the carrier roller. One or more groups of damping baffles and vortex blades are arranged on the circumferential surface of the middle part of the carrier roller shaft, the damping baffles are positioned at the middle lower part of the carrier roller shaft, and the vortex blades are positioned above the carrier roller shaft; the centers of the two ends of the carrier roller shaft are provided with transverse holes leading to the interior of the carrier roller and vertical holes communicated with the transverse holes. The damping liquid is injected into the carrier roller and can well provide damping force for rotation of the carrier roller, and the problems of overspeed of a downward conveying belt and rapid downward sliding of a broken belt are solved; the baffle is arranged on the carrier roller shaft, and the baffle can stop flowing damping liquid to generate damping force which indirectly acts on the roller skin. By means of the vortex blades on the shaft, air in the carrier roller can directionally flow and circulate with external air through the holes in the shaft, and heat dissipation can be well provided for the carrier roller.

Description

Technical Field

[0001] The utility model relates to the field of belt conveyors, in particular to a damping roller for a down-conveying belt conveyor. Background Art

[0002] Downstream belt conveyors are often used in the mining field. The motor of the downstream belt conveyor has two operating states. When the conveyor is empty or lightly loaded, due to insufficient gravity of the carried material, the motor needs to run in an electric mode to overcome the running resistance of the whole machine; when the material load is heavy or fully loaded, the inclined component of the material's gravity will be greater than the running resistance of the conveyor, thereby generating an acceleration force, causing the motor to enter the power generation state and generate electrical energy.

[0003] Typically, when the motor's electromagnetic counter-torque and the acceleration torque are balanced, the conveyor can operate stably at a constant speed. However, if the conveyor is severely overloaded, the motor may exceed its overturning torque, causing the motor to lose control, the speed to continue to rise, and the counter-torque to decrease. As the belt speed continues to increase, the lower conveyor enters a runaway state. At this point, if not restricted or stopped, serious mechanical and personal accidents will occur. To prevent such accidents, some manufacturers install damping plates on the lower conveyor. The damping plates rub against the belt, thereby reducing the speed. However, the friction between the damping plates and the belt can cause heat to cause sparks or fire, posing a safety hazard and severely damaging the belt.

[0004] Patent number CN206013751U, titled "Conveyor Belt Roller," discloses a belt conveyor roller with a damping structure comprising an internal friction structure positioned inside the bearing and an external friction structure positioned outside the bearing. The roller has a high operating friction resistance, slows the speed of descent, and allows the material on the downward belt to run more smoothly, thereby improving the controllability and safety of the downward belt conveyor. This patent has two main shortcomings: first, the roller has a relatively high resistance when the conveyor is started, consuming a large amount of electricity and not being economical; second, this friction contact resistance will continue to wear as the roller rotates. As the conveyor runs longer, the sliding friction is overcome, and the friction roller loses its frictional function.

[0005] The patent with announcement number CN207258632U, named "Angled Downward-Moving Magnetic Resistance Roller", relates to an inclined downward-moving magnetic resistance damping roller. When the conveyor belt is running, the aluminum tube cuts the magnetic lines of force and generates electricity to produce eddy currents, thereby generating a rotational damping force on the cylinder, thereby achieving the effect of deceleration. However, the heat generated by the eddy currents generated by the aluminum tube cutting the magnetic lines of force in this patent cannot be dissipated well, and heat dissipation is difficult. If the temperature of the roller continues to increase, the magnet will be demagnetized and may even burn the belt. In addition, the magnetic force of the magnetic resistance roller may interfere with surrounding electronic equipment. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a damping roller for a down-conveying belt conveyor, which solves the problems of the damping roller having an unclear damping effect and the difficulty in heat dissipation of the damping roller.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a damping roller for a down-conveying belt conveyor, comprising a roller skin and a roller shaft; bearing seats are provided inside both ends of the roller skin, bearings are installed between the two bearing seats and the roller shaft, the roller shaft is passed through the inner rings of the two bearings, an inner seal is provided between the inner side of the bearing and the bearing seat, and a retaining ring is used to limit the outer side of the bearing; dimethyl silicone oil damping liquid is provided inside the roller.

[0008] Furthermore, one or more groups of damping baffles and swirl blades are provided on the central circumferential surface of the roller shaft, and each group includes 3 to 4 damping baffles and 1 to 2 swirl blades, which are arranged at the same position.

[0009] Furthermore, each group of the damping baffles is located in the lower middle portion of the roller shaft, and the vortex blades are located above the roller shaft.

[0010] Furthermore, the damping baffle is in the shape of a rectangular steel plate and is fixed on the circumferential surface of the roller shaft, and the vortex blade is in the shape of a fan blade.

[0011] Furthermore, a sealing ring base is provided on the other side of the bearing seat, and a rotating shaft lip sealing ring is provided on the sealing ring base.

[0012] Furthermore, the centers of both ends of the roller shaft are provided with horizontal holes leading to the interior of the roller and vertical holes communicating with the horizontal holes. The depth of the horizontal holes exceeds the position of the sealing ring base. The vertical holes are arranged downward above the damping fluid. The damping fluid is injected into the interior of the roller through the horizontal holes and the vertical holes.

[0013] Furthermore, an outer sealing group is provided on the outer side of the bearing.

[0014] Compared with the prior art, the utility model provides a damping roller for a down-conveyor belt conveyor, which has the following beneficial effects:

[0015] 1. The utility model injects damping liquid into the interior of the roller, which can provide damping force for the rotation of the roller. The damping force of the damping liquid is equal to the damping coefficient multiplied by the square of the flow rate. When the speed of the roller increases, the flow rate of the damping liquid also increases, and the damping force also increases, which can reduce more kinetic energy of the roller rotation and fundamentally solve the problem of overspeed and broken belt rapid decline of the conveyor belt.

[0016] 2. The utility model sets a baffle on the roller shaft, which can generate damping force by blocking the flow of damping fluid and indirectly act on the roller skin; at the same time, a vortex blade is also provided on the roller shaft, which drives the flow of air inside the roller when the roller rotates. The vortex blade on the shaft can make the air inside the roller flow in a directional manner.

[0017] 3. The utility model provides holes at both ends of the roller shaft for communicating with the inside of the roller, thereby connecting the air inside the roller with the outside air. When heat is generated inside the roller, the heat can be dissipated through the holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the interior main view of the utility model;

[0019] Figure 2 This is a schematic sectional view taken along the line AA of the present invention;

[0020] In the figure: 1- roller skin, 2- roller shaft, 3- bearing seat, 4- inner seal, 5- bearing, 6- retaining ring, 7- outer seal group, 8- seal ring base, 9- rotating shaft lip seal, 10- damping fluid, 11- damping baffle, 12- vortex blade, 201- horizontal hole, 202- vertical hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0022] See also Figure 1-2 In this embodiment: a damping roller for a down-conveying belt conveyor comprises a roller skin 1 and a roller shaft 2; the roller skin 1 is the shell of the damping roller, and bearing seats 3 are provided inside both ends. Bearings 5 ​​are installed between the two bearing seats 3 and the roller shaft 2, and the roller shaft 2 is passed through the inner rings of the two bearings 5. An inner seal 4 is provided between the inner side of the bearing 5 and the bearing seat 3. A retaining ring 6 is used to limit the outer side of the bearing 5, and an outer seal group 7 is also provided on the outer side of the bearing 5.

[0023] On the other side (inside) of the bearing seat 3 is a sealing ring base 8, on which is mounted a rotating shaft lip seal 9. Dimethyl silicone damping fluid 10 is located inside the roller. Because the inner seal 4 is not waterproof, the rotating shaft lip seal 9 seals the dimethyl silicone damping fluid 10 within the roller, preventing it from entering the bearing 5 and causing the bearing grease to lose its lubrication and damage the bearing 5. When the roller rotates, driving the damping fluid 10, the relative motion of the liquid molecules within the dimethyl silicone damping fluid 10 generates friction and shear forces, resulting in viscous resistance and hindering the roller's rotation.

[0024] One or more groups of damping baffles 11 and swirl blades 12 are provided on the central circumferential surface of the roller shaft 2. Each group includes 3 to 4 damping baffles 11 and 1 to 2 swirl blades 12, which are arranged at the same position. Figure 2 As shown, each group of damping baffles 11 is located in the middle and lower part of the roller shaft 2, and the vortex blades 12 are located above the roller shaft 2. The damping baffles 11 are in the shape of rectangular steel plates and are fixed to the circumferential surface of the roller shaft 2. When the damping fluid 10 flows, the damping fluid 10 collides with the damping baffles 11, reducing the kinetic energy of the damping fluid 10 and slowing down the speed. The friction and shear force inside the damping fluid 10 act on the roller skin 1, hindering the rotation of the roller. The vortex blades 12 are similar in shape to fan blades. When the roller rotates, they drive the air inside the roller to rotate. When the air contacts the vortex blades 12, the special shape of the vortex blades 12 causes the air to swirl axially.

[0025] Further as Figure 1 As shown, multiple groups of damping baffles 11 or vortex blades 12 can be set at different positions of the roller shaft 2 according to the inclination angle and transportation capacity of the belt conveyor, or the heat dissipation condition.

[0026] Further as Figure 1 As shown, the centers of both ends of the roller shaft 2 are provided with a horizontal hole 201 leading to the interior of the roller and a vertical hole 202 intersecting the horizontal hole 201, wherein the depth of the horizontal hole 201 exceeds the position of the sealing ring base 8, and the vertical hole 202 is arranged downward above the damping fluid 10, and the damping fluid 10 is injected into the interior of the roller through the horizontal hole 201 and the vertical hole 202. The horizontal hole 201 and the vertical hole 202 are also the connection holes between the air inside the roller and the outside air. When heat is generated inside the roller, the heat can be dissipated through the holes. When the roller rotates, the air inside the roller is driven to rotate. Through the vortex blades 12 on the roller shaft 2, the air inside the roller can be directed to flow and circulate with the outside air through the holes on the roller shaft 2, so that the heat generated by the roller damping can be well dissipated.

[0027] The damping fluid 10 effectively damps the rotation of the idler. The damping force of the damping fluid 10 is equal to the damping coefficient multiplied by the square of the flow rate. The rotation of the idler drives the flow of the damping fluid 10, dissipating the kinetic energy of the idler's rotation. The stationary damping baffle 11 blocks the flow of the damping fluid 10, thereby dissipating the kinetic energy of the damping fluid 10. When the idler's speed is very slow, the damping force is very small. As the idler's speed increases, the damping force increases, providing a greater damping force, fundamentally addressing the problems of overspeed and belt breakage and rapid downdrafting of the conveyor belt. Furthermore, silicone oil damping fluid only significantly evaporates at temperatures between 200°C and 300°C. At 150°C, the volatility of silicone oil is less than 2% within 30 days. Conventional idlers operate at a temperature of approximately 50°C. Therefore, silicone oil damping fluid meets the requirements of idlers. Furthermore, if the conveyor control system detects a decrease in damping effectiveness, damping fluid can be added through the oil filling holes at both ends of the shaft.

[0028] The working principle of the present invention is as follows: when the roller starts to rotate, it drives the damping fluid 10 to flow, overcomes the viscous resistance of the damping fluid 10, and consumes the kinetic energy of the roller's rotation. The roller shaft 2 is stationary and does not rotate. The damping baffle 11 on the shaft can block the flow of the damping fluid 10, thereby consuming the kinetic energy of the damping fluid 10. The damping fluid 10 acts on the rotation of the roller again, over and over again, continuously providing a damping effect for the roller. Initially, the damping fluid 10 has a slow speed and can provide a smaller damping force for the conveyor. When the roller speed increases, the flow rate of the damping fluid 10 also increases, and the damping force also increases, which can reduce more of the kinetic energy of the roller's rotation, fundamentally solving the problem of overspeed and broken belts in the conveyor belt.

[0029] The damping baffle 11 is arranged in the middle and lower part of the roller shaft 2, and the vortex blade 12 is arranged above the roller shaft 2. This can prevent the damping fluid 10 from contacting the vortex blade 12 to generate axial force, while the vortex blade 12 above can generate vortex force on the air, so that the air in the roller flows in a directional manner and flows with the air outside the roller, thereby achieving the effect of heat dissipation.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A damping roller for a down-conveyor belt conveyor, characterized in that: It includes a roller skin and a roller shaft; bearing seats are provided inside both ends of the roller skin, bearings are installed between the two bearing seats and the roller shaft, the roller shaft is passed through the inner rings of the two bearings, an inner seal is provided between the inner side of the bearing and the bearing seat, and a retaining ring is used to limit the outer side of the bearing; dimethyl silicone oil damping liquid is provided inside the roller.

2. The damping roller of a down-conveyor belt conveyor according to claim 1, characterized in that: One or more groups of damping baffles and swirl blades are arranged on the central circumferential surface of the roller shaft, and each group includes 3 to 4 damping baffles and 1 to 2 swirl blades, which are arranged at the same position.

3. The damping roller of a down-conveyor belt conveyor according to claim 2, characterized in that: Each group of the damping baffles is located in the lower middle of the roller shaft, and the vortex blades are located above the roller shaft.

4. The damping roller of a down-conveyor belt conveyor according to claim 3, characterized in that: The damping baffle is in the shape of a rectangular steel plate and is fixed on the circumferential surface of the roller shaft. The vortex blade is in the shape of a fan blade.

5. The damping roller of a down-conveyor belt conveyor according to claim 1, characterized in that: A sealing ring base is provided on the other side of the bearing seat, and a rotating shaft lip sealing ring is provided on the sealing ring base.

6. The damping roller of a down-conveyor belt conveyor according to claim 5, characterized in that: The centers of both ends of the roller shaft are provided with horizontal holes leading to the interior of the roller and vertical holes communicating with the horizontal holes. The depth of the horizontal holes exceeds the position of the sealing ring base. The vertical holes are arranged downward above the damping fluid. The damping fluid is injected into the interior of the roller through the horizontal holes and the vertical holes.

7. The damping roller of a down-conveyor belt conveyor according to claim 1, characterized in that: An outer side sealing group is also provided on the outer side of the bearing.

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