A drum and a driving device thereof

Abstract

The present application relates to the technical field of drum driving equipment, in particular to a drum and a driving device thereof, the driving device comprising a driving frame, the driving frame being provided with annular end plates at both ends, the annular end plates being connected and fixed by a cross beam, and the annular end plates being provided with sleeving portions at opposite sides; three adjusting arms are uniformly installed on each annular end plate in a radial direction, each adjusting arm being provided with a pulley at an end portion, both ends of the drum body being provided with grooves, and a transmission belt being sleeved on the pulleys and the grooves, wherein one of the pulleys is driven by a first driving device and drives the drum body to rotate through the transmission belt; a rotating disc provided with an arc-shaped hole is rotatably installed on the outside of the annular end plate, and a lever on the adjusting arm extends into the arc-shaped hole; when the rotating disc rotates, each adjusting arm is synchronously slid in a radial direction through the lever, so as to automatically and uniformly adjust the tension of the transmission belt. The present application further provides a drum provided with grooves and a sleeving annular opening. The device is uniformly stressed, the synchronous and precise tension adjustment is realized, the operation is stable and reliable, and the maintenance is convenient.

Description

Technical Field

[0001] This invention relates to the field of roller drive equipment technology, specifically to a roller and its drive device. Background Technology

[0002] As a core component in industrial applications such as material conveying, screening, mixing, and surface treatment, rollers are widely used in mining, building materials, chemical, and food processing industries. Conventional roller drives often employ a central shaft transmission structure, where a central rotating shaft is installed at both ends of the roller. A motor drives the rotating shaft to rotate, thereby driving the entire roller to rotate. This drive method is simple in structure and technologically mature, and is commonly found in small and medium-sized roller equipment.

[0003] As industrial production demands increasingly higher drum processing capacity, the application of large-diameter, large-volume drum equipment is growing, gradually revealing the limitations of traditional center-shaft drive systems. The central shaft occupies axial space within the drum, directly compressing the effective material handling capacity. Furthermore, continuous contact between the shaft and the material can easily cause material entanglement or adhesion, affecting the continuous and stable operation of the equipment. To avoid these problems, some equipment has adopted an external belt drive system. A motor drives a pulley, which in turn drives the drum through friction. This method eliminates the need for an internal shaft, allowing for full utilization of the drum's internal space.

[0004] However, in actual use, the belt drive relies on appropriate tension to ensure the reliability of friction transmission. Insufficient tension can easily lead to slippage and loss of rotation, while excessive tension will accelerate belt wear and shorten its service life. Existing equipment mostly uses single-point tensioning or multi-point independent adjustment. Single-point tensioning can cause uneven force on the belt circumferentially, while multi-point independent adjustment makes it difficult to ensure the consistency of tension at each position, which can easily lead to problems such as belt misalignment and abnormal wear. Frequent manual adjustments also increase the workload of equipment maintenance. At the same time, uneven force during roller operation can easily lead to sway and vibration during long-term operation, which not only affects the transmission accuracy but also reduces the overall operational stability and service life of the equipment. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a roller drive device, aiming to overcome the technical defects of existing roller drive devices, such as inconsistent transmission belt tension adjustment, uneven roller operation force, and cumbersome maintenance and adjustment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A roller drive device includes a drive frame, the drive frame including annular end plates located at the left and right ends, the annular end plates being connected and fixed by three or more evenly arranged crossbeams, and the opposite end face of the annular end plates being provided with a fitting part for fitting the roller body. The annular end plate is provided with three adjusting arms evenly distributed radially. Each adjusting arm is equipped with a rotatable pulley at its end. The roller body is provided with a belt groove near both ends that is adapted to the pulley. A transmission belt is fitted on the pulley and the belt groove. One of the pulleys is driven to rotate by a first driving device and drives the roller body to rotate through the transmission belt. The drive belts on both sides of each pulley bypass the drum body and the groove on the opposite and farther side. The adjusting arms are slidably mounted on the annular end plate for adjusting the tension of the drive belts.

[0007] Preferably, a corresponding turntable is rotatably mounted on the other end face of the annular end plate. The turntable has multiple arc-shaped holes evenly distributed on it. The adjusting arm is equipped with a lever that extends into the arc-shaped hole. When the turntable rotates, the lever drives the adjusting arm to slide radially, thereby adjusting the tension of the transmission belt.

[0008] Preferably, the annular end plate has three guide cylinders arranged radially on the side near the roller body, and the adjusting arm is slidably installed in the guide cylinders.

[0009] Preferably, the guide cylinder is provided with a guide groove, and the guide groove is provided with a strip-shaped elongated hole that is adapted to the lever and the arc-shaped hole.

[0010] Preferably, the inner side of the turntable is provided with an annular rack, and a drive wheel is also installed on the annular end plate, which is driven to rotate by a second drive device.

[0011] Preferably, the fitting part is an annular end cylinder adapted to the roller body, and a suitable bearing is fitted between the annular end cylinder and the roller body.

[0012] Preferably, the annular end plate is provided with a matching annular end cap on the side away from the roller body.

[0013] The present invention also provides another technical solution: a roller, including a roller body, wherein the side walls of the roller body near both ends are provided with grooves, and the inner sides of the ports at both ends of the roller body are provided with fitting rings for rotating with the fitting part.

[0014] The present invention has at least the following beneficial effects: This invention completely eliminates the traditional central shaft transmission method by adopting a wraparound external drive structure consisting of a drive frame, adjusting arm, pulleys, and transmission belt. This allows the drum body to be completely free of any rotating shaft, thus releasing its internal space. During material conveying, mixing, or processing, materials can flow freely inside the drum without obstruction. This significantly improves the effective volume utilization rate and fundamentally eliminates the risk of materials entanglement or adhesion to the central shaft, ensuring the continuity and smooth operation of the equipment.

[0015] This invention creates a friction drive mode with three pulleys evenly arranged radially along the annular end plate and synchronously cooperating with the transmission belt, forming a three-point uniform force application along the circumference of the drum body. The driving force acts symmetrically on the outer wall of the drum from multiple directions, making the drum subjected to balanced and stable forces during operation. This effectively avoids swaying and vibration caused by unilateral driving or uneven force. At the same time, the three pulleys are evenly arranged 120 degrees circumferentially, forming a large contact wrap angle between the transmission belt and the drum groove, resulting in sufficient friction contact area and significantly enhanced transmission reliability and load-bearing capacity. Furthermore, the three-point symmetrical layout ensures balanced circumferential force on the drum, resulting in smooth operation with low vibration and high transmission accuracy. It also possesses the inherent overload buffer protection characteristics of belt drives, significantly improving transmission reliability and load-bearing capacity, thereby ensuring the stable operation of large-diameter, large-volume drum equipment under heavy-load conditions.

[0016] This invention forms a complete and efficient roller drive system. The roller body itself does not require machining of the central shaft hole or installation of any shaft parts, which simplifies the manufacturing process and heat treatment difficulty of the roller body. Especially with large diameter specifications, it is easier to ensure the roundness and coaxiality of the roller body. When combined with the drive device, the overall operation accuracy is high and the vibration is small. It is suitable for a variety of complex industrial environments such as mining, building materials, chemical industry, and food processing, and has a wide range of application prospects and promotion value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the end face structure of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of the present invention.

[0018] The attached figures are labeled as follows: 100. Annular end plate; 110. Guide cylinder; 120. Annular end cylinder; 130. Strip-shaped elongated hole; 200. Adjusting arm; 210. Lever; 300. Pulley; 400. Drive belt; 500. Turntable; 510. Arc-shaped hole; 600. Drive wheel; 700. Roller body; 710. Groove. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Example 1: Figures 1 to 2 A roller drive device is presented, which adopts a cage-type external drive structure and mainly consists of four parts: drive frame, adjusting arm 200 assembly, transmission assembly, and tension adjustment mechanism. The roller body 700 is fitted inside the drive frame and rotates through the support structures at both ends. The transmission assembly is evenly arranged on the end face of the drive frame along the circumference and engages with the groove 710 on the outer wall of the roller body 700 for transmission. The tension adjustment mechanism is integrated at the end of the drive frame and can synchronously adjust the radial position of each transmission point, thereby achieving uniform adjustment of the tension of the transmission belt 400.

[0021] The drive frame, serving as the load-bearing base of the entire device, comprises two symmetrically arranged annular end plates 100. The two annular end plates 100 are connected and fixed together by three or more evenly distributed crossbeams, forming a stable cage-like frame structure. The crossbeams are arranged at equal angles along the circumference of the annular end plates 100, ensuring both the rigidity and symmetry of the overall structure while providing ample operating space for the installation and maintenance of the drum body 700. Each annular end plate 100 has a fitting portion on its side facing the drum body 700. The fitting portion adopts an annular end cylinder 120 structure adapted to the inner diameter of the drum body 700. A bearing (not shown in the figure) can be fitted between the outer wall of the annular end cylinder 120 and the fitting ring at the end of the drum body 700, allowing the drum body 700 to rotate smoothly relative to the drive frame. Simultaneously, the annular end cylinder 120 also serves a radial positioning function, ensuring that the drum body 700 and the drive frame remain coaxial. An annular end cover (not shown in the figure) can be installed on the side of the annular end plate 100 away from the roller body 700 through threaded fasteners. This cover is used to enclose and protect the transmission and adjustment structure at the end, preventing dust and debris from entering and affecting the normal operation of the mechanism.

[0022] The transmission assembly includes three adjusting arms 200, three pulleys 300, and a transmission belt 400. The three adjusting arms 200 are evenly distributed radially along the annular end plate 100, with an included angle of 120 degrees between adjacent adjusting arms 200. Each adjusting arm 200 has a freely rotatable pulley 300 mounted on its outer end. The roller body 700 has grooves 710 on its sidewalls near both ends, corresponding to the positions of the pulleys 300. The transmission belt 400 is fitted into both the three pulleys 300 and the grooves 710 of the roller body 700, forming a circular friction transmission path. The transmission belt 400 on both sides of each pulley 300 bypasses the groove 710 on the roller body 700 that is opposite to and farther from the pulley 300, creating a large wrap angle between the transmission belt 400 and the groove 710 of the roller body 700. This effectively increases the friction contact area and improves the reliability and load-bearing capacity of the transmission. One of the three pulleys 300 serves as the driving pulley, which is driven to rotate by the first driving device, which can be an electric motor or a hydraulic motor. When the driving pulley rotates, it drives the other two driven pulleys 300 to rotate synchronously through the friction of the transmission belt 400. At the same time, it drives the roller body 700 to rotate smoothly around its own axis by the friction between the transmission belt 400 and the groove 710 of the roller body 700.

[0023] The tension adjustment mechanism is integrated into the outer end face of the annular end plate 100 and mainly consists of a turntable 500, a lever 210, and a drive unit. The turntable 500 is coaxially arranged with the annular end plate 100 and can rotate around the axis. Three arc-shaped holes 510 are evenly opened on the turntable 500. The arc-shaped holes 510 extend circumferentially along the turntable 500 and their radial dimensions change continuously, exhibiting the trajectory characteristics of an Archimedean spiral. Each adjustment arm 200 is provided with a lever 210. The end of the lever 210 extends into the corresponding arc-shaped hole 510. When the turntable 500 rotates around the axis, the sidewall of the arc-shaped hole 510 exerts a radial pushing force on the lever 210, thereby driving the adjustment arm 200 to slide in the radial direction. Since the three arc-shaped holes 510 are evenly arranged on the turntable 500 and the trajectory parameters are completely consistent, the three adjusting arms 200 can extend outward or retract inward synchronously during the rotation of the turntable 500, so as to realize the synchronous adjustment of the tension at three points, ensuring that the tension of the transmission belt 400 is uniform in all directions, and effectively avoiding belt deviation and uneven wear.

[0024] The radial sliding of the adjusting arm 200 is constrained and guided by a guide structure. Three guide cylinders 110 are radially arranged on the side of the annular end plate 100 near the roller body 700. The positions of the three guide cylinders 110 correspond one-to-one with the three adjusting arms 200. The adjusting arms 200 are slidably installed inside the guide cylinders 110. The inner cross-section of the guide cylinder 110 is adapted to the shape of the adjusting arm 200, providing stable linear sliding guidance for the adjusting arm 200. A radially extending elongated slot 130 is provided on the side wall of the guide cylinder 110. The lever 210 on the adjusting arm 200 passes through the elongated slot 130 and extends into the arc-shaped hole 510 of the turntable 500. The elongated slot 130 provides clearance for the radial movement of the lever 210 and, together with the guide cylinders 110, restricts the circumferential rotational freedom of the adjusting arm 200, ensuring that the adjusting arm 200 can only slide smoothly in the radial direction. The guide cylinder 110 is also equipped with a guide groove to further improve the smoothness of the sliding of the adjusting arm 200 and the positioning accuracy.

[0025] The rotation of the turntable 500 is powered by an independent drive unit. The inner edge of the turntable 500 is configured with a ring rack structure, and a drive wheel 600 is correspondingly mounted on the ring end plate 100. The drive wheel 600 meshes with the ring rack, and the drive wheel 600 is driven to rotate by a second drive device. When the second drive device is running, it drives the drive wheel 600 to rotate, and the drive wheel 600 drives the turntable 500 to rotate around its axis through the meshing transmission belt 400, thereby realizing the electric adjustment of the tension. The second drive device can be a geared motor, a hydraulic motor, or other types of power components, which can be flexibly selected according to actual usage requirements.

[0026] The entire device operates in two interconnected stages: tension adjustment and roller drive. When the tension needs adjustment due to equipment installation or belt slack, the second drive device is activated, driving the drive wheel 600 to rotate. The drive wheel 600, through meshing with the ring rack, drives the turntable 500 to rotate around its axis. The three arc-shaped holes 510 on the turntable 500 rotate synchronously, and the sidewalls of the arc-shaped holes 510 push the three levers 210 to move radially along the elongated holes 130, thereby driving the three adjusting arms 200 to extend outward or retract inward synchronously along the guide cylinder 110. The pulleys 300 at the outer ends of the adjusting arms 200 move synchronously with the adjusting arms 200. When the three pulleys 300 move outward synchronously, the transmission belt 400 is stretched outward, and the tension increases accordingly. When the three pulleys 300 move inward synchronously, the tension of the transmission belt 400 decreases accordingly. After adjusting to the appropriate tension, the second drive device is stopped, and the current tension is maintained by the self-locking characteristics of the gear and rack meshing. The entire adjustment process involves three points moving synchronously, ensuring uniform force on the transmission belt along its 400-degree circumference, effectively avoiding belt misalignment and uneven wear caused by traditional single-point adjustment.

[0027] During normal operation of the drive drum, the first drive unit is activated, driving the drive pulley 300 to rotate. The drive pulley 300, through the friction of the transmission belt 400, drives the transmission belt 400 to circulate along the groove 710. During this movement, the transmission belt 400, relying on the friction between itself and the groove 710 of the drum body 700, drives the drum body 700 to rotate around its own axis, thus achieving continuous drum operation. Because the transmission belt 400 and the drum body 700 have a large wrap angle and are arranged symmetrically at three points, the drum body 700 experiences uniform circumferential force during transmission, and possesses flexibility and overload protection, resulting in smooth operation and low vibration. Furthermore, the entire drive structure is located outside the drum, leaving the drum's internal space completely open, preventing any interference with material conveying and processing. The symmetrically arranged drive structures at both ends share the transmission load, further enhancing the overall load-bearing capacity and operational reliability of the equipment.

[0028] In practical applications, the number and cross-sectional dimensions of the crossbeams can be flexibly adjusted according to the specifications of the rollers and load requirements. The helix angle parameter of the arc-shaped hole 510 can also be adjusted according to the required tension adjustment accuracy to obtain different adjustment strokes and accuracies. The transmission belt 400 can be of various forms, such as a flat belt, V-belt, or multi-ribbed belt. The corresponding pulley 300 and groove 710 structures can be adjusted to achieve the same transmission and tensioning effects. The specific types and installation positions of the first and second drive devices can also be flexibly arranged according to actual working conditions and are not limited to the forms listed in this embodiment.

[0029] Example 2: This example details the structure of the roller proposed in the above examples, including a roller body 700. The roller body 700, as the driven working component, has an overall cylindrical structure. Annular grooves 710 are machined on its outer walls near both ends. The cross-sectional shape of the grooves 710 is adapted to accommodate and position the transmission belt 400, preventing axial movement of the transmission belt 400 during operation. Fitting ring openings are provided on the inner sides of the ports at both ends of the roller body 700. The inner diameter of the fitting ring openings matches the outer diameter of the annular end cylinder 120, used to install bearings and form a rotational fit with the fitting part of the drive frame, ensuring the coaxiality and stability of the roller body 700 during rotation.

[0030] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0031] 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 roller drive device, comprising a drive frame; characterized in that: The drive frame includes annular end plates located at the left and right ends. The annular end plates are connected and fixed by three or more evenly arranged crossbeams. The opposite end face of the annular end plates is provided with a fitting part for fitting the main body of the mounting roller. The annular end plate is provided with three adjusting arms evenly distributed radially. Each adjusting arm is equipped with a rotatable pulley at its end. The roller body is provided with a belt groove near both ends that is adapted to the pulley. A transmission belt is fitted on the pulley and the belt groove. One of the pulleys is driven to rotate by a first driving device and drives the roller body to rotate through the transmission belt. The drive belts on both sides of each pulley bypass the drum body and the groove on the opposite and farther side. The adjusting arms are slidably mounted on the annular end plate for adjusting the tension of the drive belts.

2. The roller drive device as described in claim 1, characterized in that: A corresponding turntable is rotatably mounted on the other end face of the annular end plate. Multiple arc-shaped holes are evenly opened on the turntable. The adjusting arm is equipped with a lever that extends into the arc-shaped hole. When the turntable rotates, the lever drives the adjusting arm to slide radially, thereby adjusting the tension of the transmission belt.

3. The roller drive device as described in claim 2, characterized in that: The annular end plate has three guide cylinders arranged radially on the side near the drum body, and the adjusting arm is slidably installed in the guide cylinders.

4. The roller drive device as described in claim 3, characterized in that: The guide cylinder is provided with a guide groove, and the guide groove is provided with a strip-shaped elongated hole that is adapted to the lever and the arc-shaped hole.

5. The roller drive device as described in claim 4, characterized in that: The inner side of the turntable is provided with an annular rack, and a drive wheel is also installed on the annular end plate. The drive wheel is driven to rotate by a second drive device.

6. The roller drive device as described in claim 5, characterized in that: The assembly is an annular end cylinder adapted to the main body of the roller, and a suitable bearing is fitted between the annular end cylinder and the main body of the roller.

7. The roller drive device as described in claim 6, characterized in that: A matching annular end cap is provided on the side of the annular end plate away from the roller body.

8. A roller, characterized in that: The device includes a roller body, on which grooves are provided on the side walls near both ends, and on the inner side of the ports at both ends of the roller body, there are fitting rings for rotating with the fitting part.

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