A new mechanical flip-flop screen driving device

Abstract

The utility model discloses a novel mechanical flip -flop screen drive arrangement relates to flip -flop screen drive technical field, and this device is by eccentric drive shaft device, crank connecting rod, steering adjustment device, drive deputy axle, pulley transmission mechanism and motor composition. Crank connecting rod one end is connected with eccentric drive shaft device, and the other end is connected with steering adjustment device, and the eccentric rotation motion is converted and is given to the floating screen frame, and makes screen cloth produce flip -flop movement. Drive deputy axle passes through big pulley and small pulley and transmission v belt and motor form flexible drive chain, realize motor and the effective isolation of vibration system, improve motor operating life and whole machine stability. Steering adjustment device adopts short axle, bearing chamber and labyrinth seal structure, and has the function of supporting and dustproof, reduces dust invasion and bearing wear and tear. The drive arrangement simple structure, transmission is reliable, and maintenance is convenient, can improve the screening efficiency and operating reliability of flip -flop screen significantly.

Description

Technical Field

[0001] This utility model relates to the field of tension screen driving technology, specifically a novel mechanical tension screen driving device. Background Technology

[0002] Mechanically tensioned screens, suitable for screening fine-grained and moist materials, are widely used in industries such as coal and mining. These devices typically utilize the periodic relative motion between a floating screen frame and a tensioned screen mesh to create a tensioning effect, thereby reducing screen clogging and improving screening efficiency and throughput. To achieve stable tensioning motion, the screen usually requires a dedicated mechanical drive unit to reciprocate the floating screen frame.

[0003] In existing technologies, the floating screen frame of a mechanically tensioned screen is usually connected to an eccentric drive shaft via a drive leaf spring. An electric motor drives the eccentric drive shaft to rotate, and the elastic deformation of the leaf spring causes the floating screen frame to reciprocate, thus achieving the tensioning and screening process of the screen. This type of structure has been applied in engineering practice and can meet screening requirements under certain working conditions. However, in complex working conditions, long-cycle operation, and scenarios requiring high reliability, a series of technical problems related to the drive structure have been exposed.

[0004] Specifically, existing drive structures have drawbacks in terms of connection form, transmission path, and vibration energy transmission method, which make the equipment highly dependent on specific components, have strong transmission chain rigidity, and have a harsh working environment for the motor. These issues have an adverse impact on equipment cost control, operational stability, and service life.

[0005] In existing technologies, such as the crankshaft-connecting rod type eccentricity adjustment structure for tension screens disclosed in patent document CN218797280U, although the amplitude of the screen is adjusted through an adjustable eccentric mechanism, this structure is relatively concentrated in the transmission path, resulting in large forces on the shaft system and a long vibration transmission path, which can easily generate additional dynamic loads under complex working conditions. Furthermore, its structure requires high precision in the machining and assembly of the eccentric components, making maintenance difficult and failing to fundamentally improve the complexity of the forces and the stability of the system vibration during the tension screen drive process. Patent document CN2454048Y uses a double-sided double crank combined with an elastic connecting rod to drive the screen to generate tension motion. This drive system is highly dependent on elastic components such as elastic connecting rods and elastic supports, requiring the equipment to withstand high-frequency alternating loads during long-term operation, placing high demands on material properties and fatigue life.

[0006] While patent document CN110605236A can improve vibration balance under certain operating conditions, its driving process still relies on multiple sets of elastic elements to complete energy storage and motion transfer, making the structure relatively complex and the overall debugging difficult. In addition, the working state of the elastic components is significantly affected by factors such as temperature, fatigue, and environmental dust.

[0007] Therefore, given the increasing demand for existing mechanical tension screens, there is a need to provide a new mechanical tension screen drive device to solve the aforementioned technical problems related to operational stability, structural adaptability, and ease of maintenance. Utility Model Content

[0008] The technical problem this invention aims to solve is to overcome existing defects and provide a novel mechanical tension screen drive device. By employing a crank-connecting rod in conjunction with a steering adjustment device, the rotational motion of the eccentric drive shaft device is directly converted into the reciprocating motion of the floating screen frame, eliminating the traditional drive method that relies on leaf springs or elastic connecting rods. This avoids the risk of fatigue failure of elastic components under high-frequency, high-load conditions, reduces dependence on specific materials and imported parts, and lowers manufacturing and replacement costs, effectively solving the problems in the background technology.

[0009] To achieve the above objectives, this utility model provides the following technical solution: A novel mechanical tension screen drive device, comprising an eccentric drive shaft assembly, a crank connecting rod, a steering adjustment device, an eccentric shaft coupling, a drive secondary shaft coupling, a drive secondary shaft, a large pulley, a transmission V-belt, a small pulley, and a motor. This drive device is suitable for mechanical tension screens with floating screen frames. One end of the crank connecting rod is fixedly connected to the eccentric drive shaft assembly, and the other end is fixedly connected to the steering adjustment device. The crank connecting rod is used to rotate the eccentric drive shaft assembly. The motion is transmitted to the floating screen frame of the mechanical tension screen; the eccentric shaft coupling is connected to the shaft end of the eccentric drive shaft device via a key, and the drive secondary shaft coupling is connected to the shaft end of the drive secondary shaft via a key; the large pulley is mounted on the drive secondary shaft via a key and is connected to the small pulley via a transmission V-belt, and the small pulley is connected to the output shaft of the motor via a key, so that the motor drives the eccentric drive shaft device to rotate via the small pulley, transmission V-belt, large pulley, drive secondary shaft, drive secondary shaft coupling and eccentric shaft coupling, thereby driving the floating screen frame to reciprocate.

[0010] Furthermore, the steering adjustment device includes a short shaft, a bearing, a bearing housing, an end cover, a through-hole cover, and a labyrinth cover. The short shaft is fixed to the floating screen frame of the mechanical tension screen by welding with stiffening plates, and is rotatably installed in the bearing housing by the bearing. The bearing housing is fixedly connected to the crank connecting rod by welding. The end cover, through-hole cover, and labyrinth cover are assembled on the bearing housing, forming a sealing and dustproof structure for the mating parts between the short shaft and the bearing housing.

[0011] Furthermore, the drive sub-shaft includes a shaft, a second bearing housing, a second bearing, and a bushing; the shaft is rotatably mounted in the second bearing housing via the second bearing, and the shaft is connected to the large pulley via a key; the bushing is fitted on the shaft, and the bushing is used for axial positioning and torque transmission.

[0012] Furthermore, the eccentric drive shaft device is driven by a motor and rotates via a small pulley, a transmission V-belt, a large pulley, a drive secondary shaft, a drive secondary shaft coupling, and an eccentric shaft coupling. The eccentric drive shaft device drives the steering adjustment device to swing through a crank connecting rod. The short shaft swings with the steering adjustment device and drives the floating screen frame connected to it to reciprocate, thereby causing the screen installed on the floating screen frame to produce a tension and relaxation motion.

[0013] Furthermore, a labyrinth-style sealing structure is formed between the labyrinth cover and the through-hole cover. This sealing structure is used to prevent dust from entering the bearing in the steering adjustment device, thereby improving the dustproof performance and service life of the bearing.

[0014] Furthermore, the drive subshaft is installed in the bearing housing by setting two bearings arranged axially at intervals, so as to improve the support stability of the drive subshaft under high-speed rotation or high load conditions, reduce vibration and improve transmission reliability.

[0015] Specifically, both ends of the shaft are rotatably mounted in bearing housing two via bearing two; one end of the shaft extends outward from bearing housing two to form an extended section; a bushing is fitted onto the extended section of the shaft, and the bushing and the shaft are connected by an interference fit and / or a key, which is used to position the large pulley in the axial direction and transmit torque together with the shaft; the inner hole of the hub of the large pulley is fitted onto the outer circle of the bushing, and the large pulley is fixedly connected to the bushing by a key, thereby realizing reliable transmission between the shaft and the large pulley.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts a crank connecting rod in conjunction with a steering adjustment device to directly convert the rotational motion of the eccentric drive shaft into the reciprocating motion of the floating screen frame, thus abandoning the traditional drive method that relies on leaf springs or elastic connecting rods. On the one hand, this avoids the risk of fatigue failure of elastic components under high-frequency and high-load conditions, reduces dependence on specific materials and imported parts, and lowers manufacturing and replacement costs. On the other hand, it makes the drive path clearer, the rigidity higher, and the motion trajectory of the floating screen frame more stable, which is conducive to maintaining a good tension screening effect over a long period of time.

[0017] 2. An independent drive sub-shaft is set between the eccentric drive shaft device and the motor, and power is transmitted by belt and pulley, which effectively isolates the motor from the vibration system, and the motor body no longer directly participates in the vibration. By setting up a double bearing support and bushing positioning structure on the drive sub-shaft, the support stiffness and transmission smoothness of the shaft system under high-speed and heavy-load conditions are significantly improved, the impact of vibration on transmission components and motor is reduced, which helps to extend the service life of the motor and related transmission components and improve the reliability of the whole machine operation.

[0018] 3. The steering adjustment device of this utility model adopts a combination structure of short shaft, bearing chamber and end cover, through hole cover and labyrinth cover. While realizing the flexible swing of the floating screen frame, the labyrinth seal effectively prevents dust from entering the bearing working area, reducing wear and failure rate and extending the service life of key support parts. The whole drive device is mainly composed of common mechanical parts such as conventional shaft, bearing, coupling and pulley. It is easy to process and assemble, and simple to maintain and replace. While ensuring the efficiency and processing capacity of the tension screening, it improves the maintainability of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the steering adjustment device of this utility model; Figure 3 This is a schematic diagram of the installation structure of the drive shaft of this utility model; Figure 4 This is a schematic diagram of the elevation structure of this utility model.

[0020] In the diagram: 1 Eccentric drive shaft assembly, 2 Crank connecting rod, 3 Steering adjustment device, 31 Short shaft, 32 Bearing I, 33 Bearing chamber I, 34 End cover, 35 Through hole cover, 36 Labyrinth cover, 4 Eccentric shaft coupling, 5 Drive secondary shaft coupling, 6 Drive secondary shaft, 61 Shaft, 62 Bearing chamber II, 63 Bearing II, 64 Shaft sleeve, 7 Large pulley, 8 Drive V-belt, 9 Small pulley, 10 Electric motor. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0022] Please see Figure 1-4This utility model provides a technical solution: a novel mechanical tension screen drive device, including an eccentric drive shaft device 1, a crank connecting rod 2, a steering adjustment device 3, an eccentric shaft coupling 4, a drive secondary shaft coupling 5, a drive secondary shaft 6, a large pulley 7, a transmission V-belt 8, a small pulley 9, and a motor 10; the drive device is used to drive the floating screen frame of the mechanical tension screen to generate reciprocating motion, so that the screen mesh forms a tension effect.

[0023] One end of the crank connecting rod 2 is welded and fixed to the bearing chamber of the eccentric drive shaft device 1, and the other end is welded to the outer wall of the bearing chamber 33 of the steering adjustment device 3. The eccentric motion generated by the rotation of the eccentric drive shaft device 1 is transmitted through the crank connecting rod 2, so that the steering adjustment device 3 obtains a stable swing force, thereby driving the floating screen frame to produce reciprocating motion.

[0024] The shaft end of the eccentric drive shaft device 1 is connected to the drive secondary shaft coupling 5 through the eccentric shaft coupling 4. The drive secondary shaft coupling 5 is fixed to the shaft end of the drive secondary shaft 6 by a key connection. The large pulley 7 is mounted on the drive secondary shaft 6 by a key. The transmission V-belt 8 is fitted between the large pulley 7 and the small pulley 9. The small pulley 9 is fixed to the output shaft of the motor 10 by a key, so that the motor 10 can drive the large pulley 7 and the drive secondary shaft 6 to rotate through belt drive, thereby forming a continuous and reliable power transmission path.

[0025] The steering adjustment device 3 consists of a short shaft 31, a bearing 32, a bearing chamber 33, an end cover 34, a through-hole cover 35, and a labyrinth cover 36. The short shaft 31 is fixed to the floating screen frame by welding with stiffeners. The outer circle of the short shaft 31 is installed in the bearing chamber 33 through the bearing 32 to achieve low-friction rotation. The bearing chamber 33 is fixedly connected to the crank connecting rod 2 by welding, so that the swing force generated by the crank connecting rod 2 is stably transmitted to the short shaft 31. The end cover 34, the through-hole cover 35, and the labyrinth cover 36 are sequentially assembled on the outside of the bearing chamber 33. The labyrinth cover 36 and the through-hole cover 35 form a labyrinth sealing channel, which effectively prevents dust from entering the bearing 32 and improves the sealing performance and durability.

[0026] The drive shaft 6 includes a shaft 61, a bearing housing 62, a bearing 63, and a bushing 64. Both ends of the shaft 61 are mounted within the bearing housing 62 via two sets of axially spaced bearings 63, forming a double-support structure, which improves the stability of the drive shaft 6 under high-speed or high-load conditions. One end of the shaft 61 extends outward from the bearing housing 62 to form an extension section. The bushing 64 is fitted onto the extension section and fixed to the shaft 61 by an interference fit or key connection. The bushing 64 is used for axial positioning of the large pulley 7 and shares the torque transmission task with the shaft 61. The hub hole of the large pulley 7 is fitted onto the outer circle of the bushing 64 and fixed to the bushing 64 by a key connection, thereby achieving reliable transmission between the large pulley 7 and the shaft 61.

[0027] When the device is working, the motor 10 starts and drives the small pulley 9 to rotate. The small pulley 9 drives the large pulley 7 to rotate through the transmission V-belt 8. The large pulley 7 further drives the drive shaft 6 to rotate. The drive shaft 6 drives the eccentric drive shaft device 1 to rotate through the drive shaft coupling 5 and the eccentric shaft coupling 4. During the rotation, the eccentric drive shaft device 1 generates a periodic eccentric force due to the eccentricity. The eccentric force is transmitted to the steering adjustment device 3 through the crank connecting rod 2, causing the short shaft 31 to drive the floating screen frame to reciprocate. The periodic reciprocating motion of the floating screen frame causes the screen to produce an alternating tension and relaxation effect, thereby reducing screen hole clogging and improving screening efficiency.

[0028] The labyrinth seal structure inside the steering adjustment device 3 effectively prevents dust from entering the bearing area, ensuring that bearing 32 operates stably for a long time in a dusty environment and reducing wear; the drive subshaft 6 adopts a double bearing support structure, which improves the overall rigidity of the transmission system, making the large pulley 7, shaft 61 and related transmission components run more smoothly, which helps to reduce vibration and extend the system life; since the motor 10 is connected to the vibration system through a belt, the motor does not directly participate in the vibration, which significantly improves its service life and reliability.

[0029] In summary, this utility model achieves an efficient and stable conversion from rotary motion to reciprocating motion through a reasonable structural arrangement, significantly improving the screening effect and operational reliability of the mechanical tension screen.

[0030] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A novel mechanical tension screen drive device, comprising an eccentric drive shaft assembly (1), a crank connecting rod (2), a steering adjustment device (3), an eccentric shaft coupling (4), a drive secondary shaft coupling (5), a drive secondary shaft (6), a large pulley (7), a transmission V-belt (8), a small pulley (9), and an electric motor (10), characterized in that: One end of the crank connecting rod (2) is fixedly connected to the eccentric drive shaft device (1), and the other end is fixedly connected to the steering adjustment device (3). The eccentric shaft coupling (4) is connected to the shaft end of the eccentric drive shaft device (1) by a key. The drive secondary shaft coupling (5) is connected to the shaft end of the drive secondary shaft (6) by a key. The large pulley (7) is mounted on the drive secondary shaft (6) by a key and is connected to the small pulley (9) by a transmission V-belt (8). The small pulley (9) is connected to the output shaft of the motor (10) by a key, so that the motor (10) drives the eccentric drive shaft device (1) to rotate through the small pulley (9), transmission V-belt (8), large pulley (7), drive secondary shaft (6), drive secondary shaft coupling (5) and eccentric shaft coupling (4).

2. The novel mechanical tensioning screen driving device according to claim 1, characterized in that: The steering adjustment device (3) includes a short shaft (31), a bearing (32), a bearing chamber (33), an end cap (34), a through hole cap (35), and a labyrinth cap (36). The short shaft (31) is fixed to the floating screen frame of the mechanical tension screen by welding with stiffeners and is rotatably installed in the bearing chamber (33) by bearing (32). The bearing chamber (33) is fixedly connected to the crank connecting rod (2) by welding. The end cap (34), through hole cap (35), and labyrinth cap (36) are assembled on the bearing chamber (33).

3. The novel mechanical tensioning screen drive device according to claim 1, characterized in that: The drive shaft (6) includes a shaft (61), a bearing chamber (62), a bearing (63), and a bushing (64). The shaft (61) is rotatably mounted in the bearing chamber (62) via the bearing (63), and the shaft (61) is connected to the large pulley (7) via a key. The bushing (64) is fitted on the shaft (61).

4. The novel mechanical tensioning screen driving device according to claim 1, characterized in that: The eccentric drive shaft device (1) is driven by the motor (10) and rotates through the small pulley (9), transmission V-belt (8), large pulley (7), drive secondary shaft (6), drive secondary shaft coupling (5) and eccentric shaft coupling (4). The eccentric drive shaft device (1) drives the steering adjustment device (3) to swing through the crank connecting rod (2). The short shaft (31) swings with the steering adjustment device (3) and drives the floating screen frame connected to it to reciprocate.

5. A novel mechanical tensioning screen driving device according to claim 2, characterized in that: The labyrinth cover (36) and the through-hole cover (35) form a labyrinth-type sealing structure.

6. The novel mechanical tensioning screen drive device according to claim 1, characterized in that: The drive shaft (6) is installed in the bearing chamber (62) by means of two bearings (63) arranged axially spaced apart.

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