Belt transmission mechanism and vibrating screen device

Abstract

The utility model belongs to the technical field of vibrating screens, and discloses a belt transmission mechanism and a vibrating screen device. And the belt transmission mechanism and the connecting seat are elastically supported on a horizontal supporting surface. The driven wheel is eccentrically arranged on the first wheel shaft, the central axis of the driven wheel and the central axis of the first wheel shaft are both perpendicular to the fixed straight line, the intersection point of the central axis of the driven wheel and the fixed straight line is a first intersection point, and the intersection point of the central axis of the first wheel shaft and the fixed straight line is a second intersection point. The gravity center of the eccentric block is located on a fixed straight line, and the first intersection point and the gravity center are distributed on the two sides of the second intersection point at intervals. When the belt transmission mechanism is in a static state, the fixed straight line is perpendicular to the horizontal supporting surface, and the gravity center is close to the horizontal supporting surface relative to the second intersection point. On the basis that the whole driven wheel structure is driven to make circumferential vibration, the phenomenon that a belt is excessively tensioned is relieved, the phenomenon that the belt is loosened is relieved, the structure is simple, the number of parts is small, and the production cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of vibrating screens, in particular to a belt transmission mechanism and a vibrating screen device. Background Art

[0002] The pulley mechanism is a common transmission mechanism, which mainly includes a driving motor, a driving pulley, a driven pulley and a belt, etc. The belt is wound around the driving pulley and the driven pulley, and the driving motor drives the driving pulley to rotate around its own central axis, thereby driving the driven pulley to rotate around its own central axis.

[0003] Among them, for the pulley mechanism applied to the vibrating screen device, an eccentric block is usually fixedly arranged on the wheel shaft of the driven pulley. Structures such as the driven pulley and the eccentric block form the vibration source of the vibrating device and perform circular vibration. However, this will cause the center distance between the driven pulley and the driving pulley to be unfixed, and there is a problem that the belt is loosened. Currently, in the prior art, a tensioning motor and a tensioning pulley are usually additionally provided, and the tensioning motor drives the tensioning pulley to rotate to adjust the tension of the belt, so as to solve the problems of belt loosening or over-tensioning. However, it has the defects of complex structure and a large number of components, resulting in high production costs of the vibrating screen device. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a belt transmission mechanism and a vibrating screen device to solve the above problems existing in the belt transmission mechanism applied to the vibrating screen device in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A belt transmission mechanism, including a driving pulley, a belt and a driven pulley structure, the driven pulley structure includes:

[0007] A connecting seat, elastically supported on a horizontal support surface;

[0008] A first wheel shaft, rotatably connected to the connecting seat around its own central axis;

[0009] A driven pulley, fixedly connected to the first wheel shaft, the belt is wound around the driving pulley and the driven pulley, and the driving pulley can rotate around its own central axis to drive the belt to move;

[0010] An eccentric block, fixedly connected to the first wheel shaft;

[0011] The driven pulley is eccentrically arranged on the first wheel shaft, the central axis of the driven pulley and the central axis of the first wheel shaft are both perpendicular to a fixed straight line, the intersection point of the central axis of the driven pulley and the fixed straight line is the first intersection point, and the intersection point of the central axis of the first wheel shaft and the fixed straight line is the second intersection point;

[0012] The center of gravity of the eccentric block lies on the fixed straight line, and the first intersection point and the center of gravity point are respectively distributed on both sides of the second intersection point at intervals.

[0013] When the belt transmission mechanism is in a static state, the fixed straight line is perpendicular to the horizontal support surface, and the center of gravity point is relatively close to the second intersection point towards the horizontal support surface.

[0014] As a preferred solution of the above belt transmission mechanism, the distance between the first intersection point and the second intersection point is less than or equal to the circumferential vibration amplitude of the eccentric block.

[0015] As a preferred solution of the above belt transmission mechanism, the distance between the first intersection point and the second intersection point is equal to the circumferential vibration amplitude of the eccentric block.

[0016] As a preferred solution of the above belt transmission mechanism, the eccentric block is detachably and fixedly connected to the first wheel shaft.

[0017] As a preferred solution of the above belt transmission mechanism, the driven wheel structure further includes a first expansion sleeve, and the first expansion sleeve fixedly connects the first wheel shaft and the driven wheel.

[0018] As a preferred solution of the above belt transmission mechanism, the driven wheel is key-connected to the first wheel shaft; or, the driven wheel is integrally formed on the first wheel shaft.

[0019] As a preferred solution of the above belt transmission mechanism, the belt transmission mechanism further includes a second wheel shaft and a fixedly arranged driving motor, the driving wheel is fixedly connected to the second wheel shaft, and the output shaft of the driving motor is in transmission connection with the second wheel shaft.

[0020] A vibrating screen device, including a screen material body and a frame, the frame has a horizontal support surface, the screen material body is elastically supported on the horizontal support surface, and further includes the above belt transmission mechanism, and the connecting seat is fixedly connected to the screen material body.

[0021] As a preferred solution of the above vibrating screen device, the vibrating screen device further includes a spring, and the two ends of the spring in the axial direction are respectively fixedly connected to the screen material body and the horizontal support surface.

[0022] As a preferred solution of the above vibrating screen device, the number of the connecting seats and the eccentric blocks is two each, and the two eccentric blocks are arranged in one-to-one correspondence with the two connecting seats;

[0023] The first round shaft axially penetrates through the material screening body, and both ends of the first round shaft in the axial direction are respectively rotatably connected to the two connecting seats in a one-to-one correspondence. The driven wheel is located between the two eccentric blocks and within one of the connecting seats.

[0024] Advantages of the present utility model:

[0025] The present utility model provides a belt transmission mechanism and a vibrating screen device. Among them, the belt transmission mechanism includes a driving wheel, a belt, and a driven wheel structure. The driven wheel structure includes a connecting seat, a first round shaft, a driven wheel, and an eccentric block. The connecting seat is elastically supported on a horizontal support surface. The first round shaft is rotatably connected to the connecting seat around its own central axis. The driven wheel is fixedly connected to the first round shaft. The belt is wound around the driving wheel and the driven wheel. The driving wheel can rotate around its own central axis to drive the belt to move. The eccentric block is fixedly connected to the first round shaft. The driven wheel is eccentrically arranged on the first round shaft. The central axis of the driven wheel and the central axis of the first round shaft are both perpendicular to a fixed straight line. The intersection point of the central axis of the driven wheel and the fixed straight line is the first intersection point, and the intersection point of the central axis of the first round shaft and the fixed straight line is the second intersection point. The center of gravity point of the eccentric block is located on the fixed straight line. The first intersection point and the center of gravity point are respectively distributed on both sides of the second intersection point at intervals. When the belt transmission mechanism is in a static state, the fixed straight line is perpendicular to the horizontal support surface, and the center of gravity point is relatively close to the second intersection point towards the horizontal support surface.

[0026] When the belt transmission mechanism works, the driving wheel rotates around its own central axis to drive the belt to move, thereby driving the driven wheel and the first round shaft to rotate synchronously. The eccentric block is connected to the first round shaft, thereby driving the eccentric block to rotate synchronously. During the rotation of the eccentric block, since the center of gravity point of the eccentric block deviates from the central axis of the first round shaft, and the connecting seat is elastically supported on the horizontal support surface, the whole driven wheel structure is driven to perform circular vibration synchronously.

[0027] Among them, the intersection point of the central axis of the driven wheel and the fixed straight line is the first intersection point, the intersection point of the central axis of the first round shaft and the fixed straight line is the second intersection point, and the center of gravity point of the eccentric block is located on the fixed straight line. It can be understood that the first intersection point, the second intersection point, and the center of gravity point are all distributed on the fixed straight line. By setting the first intersection point and the center of gravity point to be respectively distributed on both sides of the second intersection point at intervals, and setting that when the belt transmission mechanism is in a static state, the fixed straight line is perpendicular to the horizontal support surface, and the center of gravity point is relatively close to the second intersection point towards the horizontal support surface. It can be understood that the eccentric block is in a natural hanging state, the center of gravity point of the eccentric block is located directly below the central axis of the first round shaft at intervals, and the central axis of the driven wheel is located directly above the central axis of the first round shaft at intervals. The horizontal distance between the central axis of the driven wheel and the central axis of the driving wheel is a preset center distance. The horizontal distance between the central axis of the driven wheel and the central axis of the driving wheel is the straight-line distance between the central axis of the first round shaft and the central axis of the driving wheel.

[0028] Therefore, when the fixed straight line rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel rotates to directly above the central axis of the first wheel shaft, the center of gravity point of the eccentric block rotates to directly below the central axis of the first wheel shaft. At this time, the centrifugal force of the eccentric block drives the entire driven wheel structure to move downward, causing the central axis of the driven wheel to move downward, which can effectively synchronously adjust the linear distance between the central axis of the driven wheel and the central axis of the driving wheel to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt tension.

[0029] When the central axis of the driven wheel rotates to the farthest end away from the driving wheel, the center of gravity point of the eccentric block rotates between the central axis of the first wheel shaft and the driving wheel. At this time, the centrifugal force of the eccentric block drives the entire driven wheel structure to approach the driving wheel along the horizontal straight line direction, causing the central axis of the driven wheel to approach the driving wheel along the horizontal straight line direction, which can effectively synchronously reduce the linear distance between the central axis of the driven wheel and the central axis of the driving wheel to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt tension. Among them, the horizontal straight line direction is perpendicular to the central axis of the first wheel shaft and perpendicular to the central axis of the driving wheel.

[0030] When the central axis of the driven wheel rotates to the closest end to the driving wheel, the center of gravity point of the eccentric block rotates to the farthest end away from the driving wheel. At this time, the centrifugal force of the eccentric block drives the entire driven wheel structure to move away from the driving wheel along the horizontal straight line direction, causing the central axis of the driven wheel to move away from the driving wheel along the horizontal straight line direction, which can effectively synchronously increase the linear distance between the central axis of the driven wheel and the central axis of the driving wheel to approach the preset center distance, thereby effectively alleviating the phenomenon of belt relaxation.

[0031] When the fixed straight line rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel rotates to directly below the central axis of the first wheel shaft, the center of gravity point of the eccentric block rotates to directly above the central axis of the first wheel shaft. At this time, the centrifugal force of the eccentric block drives the entire driven wheel structure to move upward, causing the central axis of the driven wheel to move upward, which can effectively synchronously adjust the linear distance between the central axis of the driven wheel and the central axis of the driving wheel to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt tension.

[0032] Therefore, on the basis of being able to drive the entire driven wheel structure to perform circular vibration, this belt drive mechanism effectively alleviates the phenomenon of excessive belt tension synchronously and effectively alleviates the phenomenon of belt relaxation synchronously; secondly, this belt drive mechanism has a simple structure, few components, and low production costs.

[0033] The present utility model further provides a vibrating screen device, which includes a screen material body and a frame. The frame has a horizontal support surface, and the screen material body is elastically supported on the horizontal support surface. It further includes the above-mentioned belt transmission mechanism, and the connecting seat is fixedly connected to the screen material body. By adopting the above-mentioned belt transmission mechanism, it can not only effectively drive the vibrating screen of the screen material body, but also effectively relieve the phenomenon of excessive belt tension, and effectively relieve the phenomenon of belt relaxation, improving the working stability of the vibrating screen device. Secondly, by adopting the above-mentioned belt transmission mechanism, the production cost of the vibrating screen device is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a schematic structural diagram of the belt transmission mechanism when the straight line of rotation in the specific embodiment of the present utility model rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel rotates to be directly above the central axis of the first wheel shaft;

[0035] Figure 2 FIG. is a schematic structural diagram of the belt transmission mechanism when the central axis of the driven wheel rotates to the farthest end away from the driving wheel in the specific embodiment of the present utility model;

[0036] Figure 3 FIG. is a schematic structural diagram of the belt transmission mechanism when the central axis of the driven wheel rotates to the closest end close to the driving wheel in the specific embodiment of the present utility model;

[0037] Figure 4 FIG. is a schematic partial structural diagram of the vibrating screen device provided by the specific embodiment of the present utility model.

[0038] In the figure:

[0039] 100, belt transmission mechanism;

[0040] 11, driving wheel; 12, second wheel shaft; 13, second expansion sleeve;

[0041] 2, belt;

[0042] 3, driven wheel structure; 31, connecting seat; 311, protection cavity; 32, first wheel shaft; 33, driven wheel; 34, eccentric block; 35, first expansion sleeve;

[0043] 41, first intersection point; 42, second intersection point; 43, fixed straight line;

[0044] 200, screen material body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0046] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0047] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the" second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0048] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0049] For the pulley mechanism applied to a vibrating screen device, an eccentric block is usually fixedly arranged on the axle of the driven pulley. Structures such as the driven pulley and the eccentric block form the vibration source of the vibration device and perform circular vibration. However, this will cause the center distance between the driven pulley and the driving pulley to be unfixed, and there is a problem that the belt is loosened. Currently, in the prior art, a tensioning motor and a tensioning pulley are usually additionally provided, and the tensioning motor drives the tensioning pulley to rotate to adjust the tension of the belt to solve the problems of belt loosening or over-tensioning. However, it has the defects of complex structure and a large number of components, resulting in a high production cost of the vibrating screen device.

[0050] Such as Figures 1-3As shown in the figure, the present utility model provides a belt drive mechanism 100, which includes a driving wheel 11, a belt 2, and a driven wheel structure 3. Among them, the driven wheel structure 3 includes a connecting seat 31, a first wheel shaft 32, a driven wheel 33, and an eccentric block 34. The connecting seat 31 is elastically supported on a horizontal support surface. The first wheel shaft 32 is rotatably connected to the connecting seat 31 around its own central axis. The driven wheel 33 is fixedly connected to the first wheel shaft 32. The belt 2 is wound around the driving wheel 11 and the driven wheel 33. The driving wheel 11 can rotate around its own central axis to drive the belt 2 to move. The eccentric block 34 is fixedly connected to the first wheel shaft 32. The driven wheel 33 is eccentrically arranged on the first wheel shaft 32. The central axis of the driven wheel 33 and the central axis of the first wheel shaft 32 are both perpendicular to a fixed straight line 43. The intersection point of the central axis of the driven wheel 33 and the fixed straight line 43 is a first intersection point 41, and the intersection point of the central axis of the first wheel shaft 32 and the fixed straight line 43 is a second intersection point 42. The center of gravity of the eccentric block 34 is located on the fixed straight line 43. The first intersection point 41 and the center of gravity are respectively distributed on both sides of the second intersection point 42 at intervals. When the belt drive mechanism 100 is in a stationary state, the fixed straight line 43 is perpendicular to the horizontal support surface, and the center of gravity is relatively close to the second intersection point 42 towards the horizontal support surface.

[0051] When the belt drive mechanism 100 works, the driving wheel 11 rotates around its own central axis to drive the belt 2 to move, thereby driving the driven wheel 33 and the first wheel shaft 32 to rotate synchronously. The eccentric block 34 is connected to the first wheel shaft 32, thereby driving the eccentric block 34 to rotate synchronously. During the rotation of the eccentric block 34, since the center of gravity of the eccentric block 34 deviates from the central axis of the first wheel shaft 32, and the connecting seat 31 is elastically supported on the horizontal support surface, the entire driven wheel structure 3 is driven to perform circular vibration synchronously.

[0052] Among them, the intersection point of the central axis of the driven wheel 33 and the fixed straight line 43 is a first intersection point 41, the intersection point of the central axis of the first wheel shaft 32 and the fixed straight line 43 is a second intersection point 42, and the center of gravity of the eccentric block 34 is located on the fixed straight line 43. It can be understood that the first intersection point 41, the second intersection point 42, and the center of gravity are all distributed on the fixed straight line 43. By setting the first intersection point 41 and the center of gravity to be respectively distributed on both sides of the second intersection point 42 at intervals, and setting that when the belt drive mechanism 100 is in a stationary state, the fixed straight line 43 is perpendicular to the horizontal support surface, and the center of gravity is relatively close to the second intersection point 42 towards the horizontal support surface. It can be understood that the eccentric block 34 is in a natural hanging state, and the center of gravity of the eccentric block 34 is located directly below the central axis of the first wheel shaft 32 at intervals. The central axis of the driven wheel 33 is located directly above the central axis of the first wheel shaft 32 at intervals. The horizontal distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 is a preset center distance. The horizontal distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 is the straight-line distance between the central axis of the first wheel shaft 32 and the central axis of the driving wheel 11.

[0053] Therefore, as Figure 1 shown, when the fixed straight line 43 rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel 33 rotates to directly above the central axis of the first wheel shaft 32, the center of gravity of the eccentric block 34 rotates to directly below the central axis of the first wheel shaft 32. At this time, the centrifugal force of the eccentric block 34 drives the entire driven wheel structure 3 to move downward, causing the central axis of the driven wheel 33 to move downward, which can effectively and synchronously adjust the linear distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt 2 tension.

[0054] As Figure 2 shown, when the central axis of the driven wheel 33 rotates to the farthest end away from the driving wheel 11, the center of gravity of the eccentric block 34 rotates between the central axis of the first wheel shaft 32 and the driving wheel 11. At this time, the centrifugal force of the eccentric block 34 drives the entire driven wheel structure 3 to move horizontally and linearly closer to the driving wheel 11, causing the central axis of the driven wheel 33 to move horizontally and linearly closer to the driving wheel 11, which can effectively and synchronously reduce the linear distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt 2 tension. Among them, the horizontal linear direction is perpendicular to the central axis of the first wheel shaft 32 and perpendicular to the central axis of the driving wheel 11. It can be understood that the linear distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 at this time is the horizontal distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11.

[0055] As Figure 3 shown, when the central axis of the driven wheel 33 rotates to the closest end to the driving wheel 11, the center of gravity of the eccentric block 34 rotates to the farthest end away from the driving wheel 11. At this time, the centrifugal force of the eccentric block 34 drives the entire driven wheel structure 3 to move horizontally and linearly away from the driving wheel 11, causing the central axis of the driven wheel 33 to move horizontally and linearly away from the driving wheel 11, which can effectively and synchronously increase the distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to approach the preset center distance, thereby effectively alleviating the phenomenon of belt 2 relaxation.

[0056] When the fixed straight line 43 rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel 33 rotates to directly below the central axis of the first wheel shaft 32, the center of gravity of the eccentric block 34 rotates to directly above the central axis of the first wheel shaft 32. At this time, the centrifugal force of the eccentric block 34 drives the entire driven wheel structure 3 to move upward, causing the central axis of the driven wheel 33 to move upward, which can effectively and synchronously adjust the linear distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to approach the preset center distance, thereby effectively alleviating the phenomenon of excessive belt 2 tension.

[0057] Therefore, on the basis that the belt drive mechanism 100 can drive the entire driven wheel structure 3 to perform circular vibration, it effectively alleviates the phenomenon of excessive belt tension and the phenomenon of belt relaxation synchronously; secondly, the belt drive mechanism 100 has a simple structure, fewer components, and low production costs.

[0058] Among them, the straight-line distance refers to the length of the line connecting the central axis of the driving wheel 11 and the central axis of the driven wheel 33. Among them, the line is perpendicular to the central axis of the driven wheel 33 and perpendicular to the central axis of the driving wheel 11.

[0059] Among them, Figure 1 FIG. is a schematic structural diagram of the belt drive mechanism when the fixed straight line rotates to be perpendicular to the horizontal support surface and the central axis of the driven wheel rotates to directly above the central axis of the first wheel shaft. Figure 2 FIG. is a schematic structural diagram of the belt drive mechanism when the central axis of the driven wheel rotates to the farthest end away from the driving wheel. Figure 3 FIG. is a schematic structural diagram of the belt drive mechanism when the central axis of the driven wheel rotates to the closest end to the driving wheel.

[0060] Among them, the distance between the first intersection point 41 and the second intersection point 42 is less than or equal to the circular vibration amplitude of the eccentric block 34. Such a setting enables the centrifugal force of the eccentric block 34 to effectively drive the straight-line distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to approach the preset center distance on the basis of driving the entire driven wheel structure 3 to perform circular vibration, thereby effectively alleviating the phenomenon of excessive belt tension and the phenomenon of belt relaxation.

[0061] Preferably, the distance between the first intersection point 41 and the second intersection point 42 is equal to the circular vibration amplitude of the eccentric block 34. So that on the basis of driving the entire driven wheel structure 3 to perform circular vibration, the centrifugal force of the eccentric block 34 can accurately adjust the straight-line distance between the central axis of the driven wheel 33 and the central axis of the driving wheel 11 to the preset center distance, thereby enabling the belt 2 to maintain a natural tension state throughout the operation stage.

[0062] Among them, the eccentric block 34 is detachably fixedly connected to the first wheel shaft 32. By setting the eccentric block 34 to be detachably fixedly connected to the first wheel shaft 32, the distribution position of the center of gravity of the eccentric block 34 can be adjusted by replacing eccentric blocks 34 of different weights and / or shapes, so that it can be better matched with different driven wheels 33, improving the versatility of the belt drive mechanism 100.

[0063] Specifically, in this embodiment, the eccentric block 34 is detachably fixedly connected to the first wheel shaft 32 by screws. In other embodiments, the eccentric block 34 can also be detachably fixedly connected to the first wheel shaft 32 by bolts and nuts.

[0064] Among them, as Figures 1-3 shown, the driven wheel structure 3 further includes a first expansion sleeve 35, and the first expansion sleeve 35 fixedly connects the first wheel shaft 32 and the driven wheel 33, so as to realize the fixed connection between the first wheel shaft 32 and the driven wheel 33.

[0065] Specifically, the first expansion sleeve 35 can be fixedly connected to the first wheel shaft 32 by key connection or interference fit. The first expansion sleeve 35 can be fixedly connected to the driven wheel 33 by key connection or interference fit.

[0066] As an alternative solution, the driven wheel 33 is interference-fitted on the first wheel shaft 32. Or, the driven wheel 33 is integrally formed on the first wheel shaft 32. Or, the first wheel shaft 32 and the driven wheel 33 are key-connected, and the first end cover presses the driven wheel 33 against the shaft shoulder of the first wheel shaft 32 along the axial direction of the first wheel shaft 32. All of them can also realize the fixed connection between the first wheel shaft 32 and the driven wheel 33. It can be understood that other connection methods can also be used to connect the first wheel shaft 32 and the driven wheel 33, as long as the first wheel shaft 32 and the driven wheel 33 can be fixedly connected.

[0067] Among them, as Figures 1-3 shown, the belt transmission mechanism 100 further includes a second wheel shaft 12 and a fixedly arranged driving motor. The driving wheel 11 is fixedly connected to the second wheel shaft 12, and the output shaft of the driving motor is in transmission connection with the second wheel shaft 12. When the belt transmission mechanism 100 operates, the driving motor drives the driving wheel 11 to rotate around its own central axis, drives the belt 2 to move, and thus drives the driven wheel 33, the first wheel shaft 32 and the eccentric block 34 to rotate synchronously. Thus, under the action of the centrifugal force of the eccentric block 34, the whole driven wheel structure 3 is driven to perform circular vibration synchronously.

[0068] Specifically, as Figures 1-3 shown, the belt transmission mechanism 100 further includes a second expansion sleeve 13, and the second expansion sleeve 13 fixedly connects the second wheel shaft 12 and the driving wheel 11, so as to realize the fixed connection between the second wheel shaft 12 and the driving wheel 11.

[0069] Specifically, the second expansion sleeve 13 can be fixedly connected to the second wheel shaft 12 by key connection or interference fit. The second expansion sleeve 13 can be fixedly connected to the driving wheel 11 by key connection or interference fit. It can be understood that the central axes of the second expansion sleeve 13, the driving wheel 11 and the second wheel shaft 12 are all collinear.

[0070] As an alternative solution, the driving wheel 11 is press-fitted on the second rotating shaft 12. Or, the driving wheel 11 is integrally formed with the second rotating shaft 12. Or, the second rotating shaft 12 is key-connected to the driving wheel 11, and the second end cover presses the driving wheel 11 against the shaft shoulder of the second rotating shaft 12 along the axial direction of the second rotating shaft 12. All of these can also achieve the fixed connection between the second rotating shaft 12 and the driving wheel 11. It can be understood that other connection methods can also be used to connect the second rotating shaft 12 and the driving wheel 11, as long as the second rotating shaft 12 and the driving wheel 11 can be fixedly connected.

[0071] The present utility model also provides a vibrating screen device, as Figure 4 shown, which includes a screening body 200 and a frame. The frame has a horizontal support surface, and the screening body 200 is elastically supported on the horizontal support surface. It further includes the above-mentioned belt transmission mechanism 100, and the connecting seat 31 is fixedly connected to the screening body 200.

[0072] By adopting the above-mentioned belt transmission mechanism 100, it can not only effectively drive the screening body 200 to vibrate and screen materials, but also effectively relieve the phenomenon of excessive tension of the belt 2, and effectively relieve the phenomenon of the belt 2 loosening, improving the working stability of the vibrating screen device. Secondly, by adopting the above-mentioned belt transmission mechanism 100, the production cost of the vibrating screen device is effectively reduced.

[0073] Among them, the vibrating screen device further includes a spring. The two ends of the spring along the axial direction are respectively fixedly connected to the screening body 200 and the horizontal support surface. To realize the elastic support of the screening body 200 on the horizontal support surface of the frame, so that the screening body 200 can effectively perform circular vibration.

[0074] Optionally, for the vibrating screen device, in order to improve the stability of driving the screening body 200 to perform circular vibration. The number of the connecting seat 31 and the eccentric block 34 is set to be two, and the two eccentric blocks 34 are arranged in one-to-one correspondence with the two connecting seats 31. The first rotating shaft 32 axially penetrates the screening body 200, and the two ends of the first rotating shaft 32 along the axial direction are respectively rotatably connected to the two connecting seats 31 in one-to-one correspondence, and the driven wheel 33 is located between the two eccentric blocks 34 and within one of the connecting seats 31.

[0075] It can be understood that the first rotating shaft 32 axially penetrates the screening body 200, the two eccentric blocks 34 are respectively located at the two axial ends of the first rotating shaft 32, and the driven wheel 33 is located between the two eccentric blocks 34, which can effectively improve the stability of driving the first rotating shaft 32 and the driven wheel 33 to perform circular vibration, thereby effectively improving the stability of driving the screening body 200 to perform circular vibration. It can be understood that the structures of the two eccentric blocks 34 are the same.

[0076] In this embodiment, two eccentric blocks 34 are distributed at intervals along the axial direction of the first wheel shaft 32 on the outer sides of both sides of the screening material body 200, and two connecting seats 31 are distributed at intervals along the axial direction of the first wheel shaft 32 on the outer sides of both sides of the screening material body 200. And the two eccentric blocks 34 are respectively distributed in the corresponding connecting seats 31.

[0077] Furthermore, the number of the eccentric blocks 34 can also be set to be multiple. The multiple eccentric blocks 34 are divided into two groups, and the two groups of eccentric blocks 34 are arranged in one-to-one correspondence with the two connecting seats 31. The two groups of eccentric blocks 34 are respectively located at the two axial ends of the first wheel shaft 32. The driven wheel 33 is located between the two groups of eccentric blocks 34 and within one of the connecting seats 31. This enables better matching with different driven wheels 33 and further improves the versatility of the belt transmission mechanism 100.

[0078] Preferably, the connecting seat 31 is a shield connecting seat. As Figures 1-4 shown, a protection cavity 311 is formed between the shield connecting seat and the screening material body 200. The protection cavity 311 is used to accommodate the eccentric block 34, the driven wheel 33, and a part of the first wheel shaft 32. Thus, the shield connecting seat is used for connecting with the first wheel shaft 32 and the screening material body 200, enabling the first wheel shaft 32 to rotate effectively, and can also isolate external debris, etc. from entering the protection cavity 311, effectively avoiding the influence of external debris, etc. on the working performance of the first wheel shaft 32 and / or the driven wheel 33 and / or the eccentric block 34.

[0079] Among them, the vibrating screen device can specifically be a vibrating feeding device or a vibrating screening device, etc. The specific structure of the vibrating feeding device belongs to the prior art and will not be elaborated here. The specific structure of the vibrating screening device belongs to the prior art and will not be elaborated here.

[0080] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A belt transmission mechanism, comprising a driving wheel (11), a belt (2) and a driven wheel structure (3), characterized in that: The driven wheel structure (3) comprises: A connecting seat (31) is elastically supported on a horizontal supporting surface; A first wheel shaft (32) is rotatably connected to the connecting seat (31) around its own central axis; A driven wheel (33) is fixedly connected to the first wheel shaft (32); the belt (2) is wound around the driving wheel (11) and the driven wheel (33); the driving wheel (11) can rotate around its own central axis to drive the belt (2) to move; An eccentric block (34) fixedly connected to the first wheel shaft (32); The driven wheel (33) is eccentrically arranged on the first wheel shaft (32), the central axis of the driven wheel (33) and the central axis of the first wheel shaft (32) are both perpendicular to the fixed straight line (43), the intersection point of the central axis of the driven wheel (33) and the fixed straight line (43) is a first intersection point (41), and the intersection point of the central axis of the first wheel shaft (32) and the fixed straight line (43) is a second intersection point (42); The center of gravity of the eccentric block (34) is located on the fixed straight line (43), and the first intersection point (41) and the center of gravity are respectively distributed on both sides of the second intersection point (42) at intervals; When the belt transmission mechanism is in a stationary state, the fixed straight line (43) is perpendicular to the horizontal support surface, and the center of gravity is close to the horizontal support surface relative to the second intersection point (42).

2. The belt transmission mechanism according to claim 1, characterized in that: The distance between the first intersection point (41) and the second intersection point (42) is less than or equal to the circumferential vibration amplitude of the eccentric mass (34).

3. The belt transmission mechanism according to claim 1, characterized in that: The distance between the first intersection point (41) and the second intersection point (42) is equal to the circumferential vibration amplitude of the eccentric mass (34).

4. The belt transmission mechanism according to claim 1, characterized in that: The eccentric block (34) is detachably fixedly connected to the first wheel shaft (32).

5. The belt transmission mechanism according to claim 1, characterized in that: The driven wheel structure (3) further comprises a first expansion sleeve (35), wherein the first expansion sleeve (35) fixedly connects the first wheel shaft (32) and the driven wheel (33).

6. The belt transmission mechanism according to claim 1, characterized in that: The driven wheel (33) is key-connected to the first wheel axle (32); or, the driven wheel (33) is integrally formed with the first wheel axle (32).

7. The belt transmission mechanism according to any one of claims 1 to 5, characterized in that: The belt transmission mechanism further comprises a second wheel shaft (12) and a fixedly arranged driving motor, the driving wheel (11) is fixedly connected to the second wheel shaft (12), and the output shaft of the driving motor is drivingly connected to the second wheel shaft (12).

8. A vibrating screen device, comprising a screen body (200) and a frame, wherein the frame has a horizontal support surface, and the screen body (200) is elastically supported on the horizontal support surface, characterized in that: It also comprises the belt transmission mechanism according to any one of claims 1 to 7, wherein the connecting seat (31) is fixedly connected to the screening material body (200).

9. The vibrating screen device according to claim 8, characterized in that: The vibrating screen device also includes a spring, and two ends of the spring along the axial direction are respectively fixedly connected to the screen material body (200) and the horizontal support surface.

10. The vibrating screen device according to claim 8, characterized in that: The number of the connecting seats (31) and the number of the eccentric blocks (34) are both two, and the two eccentric blocks (34) are arranged in a one-to-one correspondence with the two connecting seats (31); The first wheel axle (32) axially penetrates the screening material body (200), and the two ends of the first wheel axle (32) along the axial direction are rotatably connected to the two connecting seats (31) in a one-to-one correspondence, and the driven wheel (33) is located between the two eccentric blocks (34) and in one of the connecting seats (31).

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