Belt tensioning mechanism and belt conveying assembly
By designing a belt tensioning mechanism consisting of a tensioning wheel, a sliding frame, and a rotating shaft, the problems of cumbersome adjustment and uneven force distribution of narrow belts in confined spaces are solved, achieving a belt tensioning effect that simplifies operation and results in a compact design.
Patent Information
- Application Number
- CN202520538667.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Existing narrow belt tensioning mechanisms are cumbersome to adjust in confined spaces, occupy a large amount of space, and suffer from uneven belt tension, leading to belt misalignment.
A belt tensioning mechanism including a tensioning wheel, a sliding frame, and a rotating shaft was designed. The rotating shaft drives the sliding frame to slide linearly on the support plate, which in turn drives the tensioning wheel to move synchronously. The combination of ratchet and pawl achieves uniform tensioning, and the spiral plate and transmission surface ensure synchronicity and stability.
It achieves uniform tension on narrow belts, simplifies operation, is suitable for compact designs, reduces additional space occupation, and avoids problems such as belt misalignment and uneven adjustment.
Smart Images
Figure CN223804306U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of belt conveyors, and in particular to a belt tensioning mechanism and a belt conveyor assembly. Background Technology
[0002] Narrow belts (strip belts) are widely used in the logistics industry. Various solutions utilizing narrow belts strive for compact design, aiming to accomplish specific tasks within limited space, improve equipment efficiency, and enhance product competitiveness. Among these efforts, tensioning the narrow belt and providing appropriate preload is an unavoidable issue. Currently, there are generally two main approaches to tensioning narrow belts in confined spaces:
[0003] One type of method does not use an additional tensioning mechanism to generate preload. Instead, it achieves narrow belt tension through precise design calculations and manufacturing, and then uses specialized equipment (such as an ultrasonic belt tension meter) to measure the belt preload and check whether the required preload has been achieved. However, this approach has the following shortcomings and drawbacks:
[0004] 1) The production process has high requirements and installation is relatively difficult;
[0005] 2) Narrow belts have a large length-to-width ratio. Prolonged use or temperature changes can cause belt deformation, which in turn leads to changes in belt preload, resulting in problems such as slippage, overheating, bearing damage, and shortened belt and machine component life.
[0006] 3) During mass production, each belt needs to be inspected, which is inefficient and costly.
[0007] 4) Users cannot adjust the settings during use, resulting in high usage costs and significant losses.
[0008] Another approach is to use an additional tensioning mechanism to generate preload, as shown in the attached diagram. Figure 5 As shown, the tensioning mechanism is fixed to the support plate. Rotating the tensioning bolt 100 pushes the tensioning plate 200 and the tensioning wheel outwards, tensioning the narrow belt 300. Then, the first nut 400 and the second nut 500 are tightened to prevent loosening. The shortcomings and disadvantages of this solution are as follows:
[0009] 1) The tensioning mechanism has external support plates on both sides, and the tensioning bolts on both sides need to be adjusted separately. The adjustment is cumbersome and cannot be completed in one go.
[0010] 2) The tensioning mechanism occupies additional space and is not suitable for compact design schemes;
[0011] 3) If there are adjacent components, a larger amount of space needs to be reserved for tension adjustment operations;
[0012] 4) two sides of the bolt tensioning screw length can not guarantee the same, uneven problem, leading to belt deviation. Utility model content
[0013] The utility model discloses a kind of belt tensioning mechanism and belt conveying assembly, to solve the technical problems such as the adjustment cumbersome when belt is tensioned using existing tensioning mechanism, large space occupation and belt deviation.
[0014] To solve the above technical problems, the technical scheme provided by the utility model is as follows:
[0015] Firstly, the utility model provides a belt tensioning mechanism, which comprises a tensioning wheel, a sliding frame and a rotating shaft.
[0016] The tensioning wheel is rotationally connected with the sliding frame, so as to rotate around its own axis.
[0017] The sliding frame is used to be slidingly connected with two support plates, and the sliding path is perpendicular to the axis of the tensioning wheel.
[0018] The two ends of the rotating shaft are used to be rotationally connected with the two support plates, and the rotating shaft is also drivingly connected with the sliding frame, so as to drive the sliding frame to slide linearly on the support plates under the working condition of rotating around its own axis.
[0019] Further, a driving surface extending along the circumferential direction of the rotating shaft is arranged on the rotating shaft, the driving surface is in contact with the sliding frame, the distance between the driving surface and the axis of the rotating shaft is R, and the R increases in sequence along the extension direction.
[0020] Further, two spiral plates distributed in parallel are fixed on the side surface of the rotating shaft.
[0021] The driving surface is formed on the spiral plates.
[0022] Further, the driving surface is divided into a plurality of driving sections in sequence along the extension direction, and the R of the plurality of driving sections increases in equal difference.
[0023] Further, the belt tensioning mechanism further comprises a stop assembly, the stop assembly is arranged on the support plate, and is configured to prevent the rotating shaft from reversing after the rotating shaft is rotated to the position.
[0024] Further, the stop assembly comprises a ratchet wheel and a pawl.
[0025] The ratchet wheel is coaxially arranged with the rotating shaft and fixed on the rotating shaft.
[0026] The pawl is rotationally connected with the support plate through a rotating shaft, and can rotate around the axis of the rotating shaft under the action of its own gravity, so as to be inserted into the tooth groove of the ratchet wheel.
[0027] Further, the pawl is fixed with an adjusting rod, the free end of the adjusting rod extends along the axial direction of the rotating shaft and penetrates the support plate.
[0028] Further, the sliding frame comprises an integral beam and two side beams;
[0029] The rotating shaft is in transmission connection with the beam;
[0030] The two side beams are parallel and are respectively fixed to the two ends of the beam in a vertical posture to the beam;
[0031] The two side beams are respectively in sliding fit with the two support plates.
[0032] Further, the tensioning wheel is between the two side beams and is in rotational fit with the two side beams.
[0033] In the second aspect, the belt conveying assembly comprises two support plates and the belt tensioning mechanism.
[0034] The two support plates are parallel to each other and are symmetrically distributed;
[0035] The support plate is provided with a through hole and a sliding groove;
[0036] The rotating shaft penetrates the through hole, and the sliding frame penetrates the sliding groove.
[0037] Compared with the prior art, the belt tensioning mechanism has the following beneficial effects:
[0038] In the belt tensioning mechanism, by rotating the rotating shaft, the sliding frame slides linearly on the two support plates in a direction perpendicular to the axis of the tensioning wheel, and drives the tensioning wheel to move synchronously; in specific application, the moving tensioning wheel can realize the tensioning of the narrow belt. As can be seen, compared with the prior art, the belt tensioning mechanism is simple in tensioning operation, the edges of the tensioning wheel move synchronously during tensioning, and the uniform tension of the belt is ensured; in addition, the belt tensioning mechanism is not arranged outside the two support plates, and is suitable for a compact design scheme, in the case of adjacent components, only the space of the tool needs to be reserved, and the additional space occupied is small.
[0039] The belt conveying assembly has the following beneficial effects:
[0040] The belt conveying assembly comprises the belt tensioning mechanism, and therefore the technical advantages and effects achieved by the belt conveying assembly also include the technical advantages and effects achieved by the belt tensioning mechanism, which will not be described herein.
[0041] In order to make the above objects, features and advantages of the present application more obvious, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0042] In order to make the above objects, features and advantages of the present application more obvious, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows.
[0043] Figure 1 The structure schematic view of the belt tensioning mechanism provided by the present application is shown in the figure.
[0044] Figure 2 The structure schematic view of the belt tensioning mechanism provided by the present application is shown in the figure.
[0045] Figure 3 The structure schematic view of the belt tensioning mechanism provided by the present application is shown in the figure.
[0046] Figure 4 The structure schematic view of the belt tensioning mechanism provided by the present application is shown in the figure.
[0047] Figure 5 The structure schematic view of the belt tensioning mechanism provided by the present application is shown in the figure.
[0048] Icon:
[0049] 100-tensioning bolt; 200-tensioning plate; 300-narrow belt; 400-first nut; 500-second nut;
[0050] 1-tensioning wheel; 2-sliding frame; 3-rotating shaft;
[0051] 4-supporting plate; 401-perforation; 402-sliding groove;
[0052] 5-spiral plate;
[0053] 6-stop assembly; 601-ratchet wheel; 602-pawl; 603-adjusting rod. DETAILED DESCRIPTION
[0054] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without creative labor are within the scope of protection of the present application.
[0055] It should be noted that like reference numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it should not require further defining and explaining in subsequent views.
[0056] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, such as no separate marking, should be understood as basic quantities of international system of units, or derived quantities derived from basic quantities by multiplication, division, differentiation or integration, etc.
[0057] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0058] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0059] Some embodiments of the utility model will be described in detail below with reference to the drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.
[0060] There are usually two kinds of schemes for tensioning narrow belts, one is not to use additional tensioning mechanism to generate pre-tightening force, and the other is to use additional tensioning mechanism to generate pre-tightening force. After the pre-tightening force of the former belt changes, it cannot be adjusted, which will cause problems such as slipping, overheating, bearing damage, shortening the service life of the belt and machine parts, etc. The latter is complicated to adjust, occupies a large space, is not suitable for compact design scheme, and has the problem of uneven force on the belt, which leads to belt deviation.
[0061] Therefore, the utility model embodiment provides a belt tensioning mechanism, which refers toFigures 1 to 4 The belt tensioning mechanism comprises a tensioning wheel 1, a sliding frame 2 and a rotating shaft 3; the tensioning wheel 1 is rotationally connected with the sliding frame 2 to rotate around its own axis; the sliding frame 2 is used to be slidingly connected with two support plates 4, and the sliding path is perpendicular to the axis of the tensioning wheel 1; the two ends of the rotating shaft 3 are rotationally connected with the two support plates 4, and the rotating shaft 3 is further drivingly connected with the sliding frame 2 to drive the sliding frame 2 to slide linearly on the support plates 4 under the working condition of rotating around its own axis.
[0062] In the belt tensioning mechanism, by rotating the rotating shaft 3, the sliding frame 2 slides linearly on the two support plates 4 in the direction perpendicular to the axis of the tensioning wheel 1, and drives the tensioning wheel 1 to move synchronously; in specific application, the moving tensioning wheel 1 can realize the tensioning of the narrow belt. As can be seen, compared with the prior art, the belt tensioning mechanism is simple in tensioning operation, and the two edges of the tensioning wheel 1 move synchronously during tensioning, which ensures the uniformity of the force on the belt; in addition, the belt tensioning mechanism is not arranged outside the two support plates 4, and is suitable for compact design scheme, and in the case of adjacent components, only the space for the tool needs to be reserved, and the additional space occupied is small.
[0063] Further, referring to Figure 1 , the sliding frame 2 comprises an integral cross beam and two side beams; the rotating shaft 3 is drivingly connected with the cross beam; the two side beams are parallel to each other and are respectively fixed to the two ends of the cross beam in a perpendicular posture, and are respectively slidingly connected with the two support plates 4; the tensioning wheel 1 is located between the two side beams, a limiting shaft penetrating through the center of the tensioning wheel 1 is rotationally connected with the tensioning wheel 1 through a bearing and is clamped between the two side beams, and the two ends of the limiting shaft are in contact with the two opposite surfaces of the two support plates 4.
[0064] As shown in Figure 1 and Figure 3 , by adopting the above design, when the rotating shaft 3 rotates, the driving force acts on the cross beam, and then the sliding frame 2 and the tensioning wheel 1 slide as a whole, and the narrow belt is tensioned. In addition, in the above design, the assembly mode of the sliding frame 2, the tensioning wheel 1 and the support plate 4 avoids the deviation of the sliding frame 2 relative to the two support plates 4, and ensures the uniformity of the force on the two edges of the narrow belt.
[0065] In an embodiment of the present application, referring to Figure 1 , the rotating shaft 3 drives the sliding frame 2 to slide through an irregular arc-shaped surface with gradually increasing diameter, which is a transmission surface, and the diameter is the distance R between the transmission surface and the axis of the rotating shaft 3. Alternatively, the transmission surface is formed on the rotating shaft 3 and is integrally formed with the rotating shaft 3; or as shown in Figure 1 and Figure 2 , the transmission surface is formed on a spiral plate 5, and the spiral plate 5 is provided with two plates, and the two spiral plates 5 are parallel to each other and are fixed to the rotating shaft 3.
[0066] In application, referring toFigure 3 The two ends of the rotating shaft 3 project out of the two support plates 4, and the two spiral plates 5 are also outside the two support plates 4 and are symmetrically distributed about the two support plates 4. When the rotating shaft 3 is rotated by a tool, the two spiral plates 5 are rotated synchronously, the side surface of the spiral plate 5 pushes the sliding frame 2 to slide obliquely to the left and downward, and the narrow belt is tensioned.
[0067] In other embodiments, the rotating shaft 3 can also drive the sliding frame 2 to slide through a gear and rack structure, wherein the gear is coaxially fixed to the rotating shaft 3, and the rack is fixed to the sliding frame 2. The driving process will not be described in detail here.
[0068] In the embodiment, as shown in Figure 1 The belt tensioning mechanism also comprises a stop component 6, which is arranged on the support plate 4 and is configured to prevent the rotating shaft 3 from reversing after the rotating shaft 3 is rotated to a position.
[0069] More preferably, as shown in Figure 1 The stop component 6 comprises a ratchet wheel 601 and a pawl 602; the ratchet wheel 601 is coaxially arranged on the rotating shaft 3 and is fixed to the rotating shaft 3, and is located between the two spiral plates 5; the pawl 602 is rotatably connected to the support plate 4 through a rotating shaft and can rotate about the axis of the rotating shaft under the action of its own gravity to insert into the tooth groove of the ratchet wheel 601.
[0070] As shown in Figure 1 and Figure 3 When the rotating shaft 3 rotates clockwise, the ratchet wheel 601 and the two spiral plates 5 are driven to rotate synchronously, the teeth of the ratchet wheel 601 lift the pawl 602 upward, the pawl 602 is lifted and falls once every tooth, the spiral plate 5 pushes the sliding frame 2 downward, and the tensioning wheel 1 tension the narrow belt; after the ratchet wheel 601 is rotated to a position, the pawl 602 falls under the action of its own gravity and inserts into the tooth groove, preventing the ratchet wheel 601 from rotating counterclockwise, and ensuring the effectiveness of tensioning.
[0071] Further, as shown in Figure 1 The pawl 602 is fixed with an adjusting rod 603, the axis of the adjusting rod 603 deviates from the axis of the rotating shaft, the free end of the adjusting rod 603 extends along the axis of the rotating shaft and penetrates out of the support plate 4. For example, as shown in Figure 1 Lifting the adjusting rod 603 upward, the pawl 602 rotates counterclockwise about the axis of the rotating shaft, and is separated from the tooth groove, thereby releasing the restriction on the ratchet wheel 601, that is, releasing the tensioning of the narrow belt, at this time, the tensioning wheel 1 can be adjusted again.
[0072] More preferably, as shown in Figure 2 In the extending direction, the transmission surface is sequentially divided into a plurality of transmission segments, the R of the plurality of transmission segments is in equal difference increment, and the angle corresponding to each transmission segment is equal, which is θ (θ = 360° / n, wherein n is the number of teeth of the ratchet wheel 601).
[0073] With the above design, the ratchet 601 is locked every time it rotates θ, and the radius of the transmission section increases by a fixed value. Therefore, the more n, the greater the tension range that can be achieved, and the greater the incremental value, the greater the pre-tightening force of the narrow belt after each adjustment. In addition, according to the Hook's theorem:
[0074] F n = k * x * A, where F n is the pre-tightening force of the narrow belt generated by each angle, k is the tension per square unit of the narrow belt (the existing value is provided by the narrow belt manufacturer), x is the stretching amount of the narrow belt per angle, and A is the cross-sectional area of the narrow belt.
[0075] The pre-tightening force of the narrow belt rotating θ can be calculated using the Euler motion equation, and then F / F n can be calculated to determine how many θ the ratchet 601 needs to rotate to meet the pre-tightening requirement.
[0076] It should be noted that, as shown in Figure 2 , each transmission section corresponds to an independent sector, and the angles of the shadow sectors of each sector are equal. After the ratchet 601 is rotated into place, the transmission section in the shadow sector is in contact with the crossbeam, and at this time the center line of the transmission section coincides with the center line of the tensioning wheel 1 and passes through the contact point of the transmission section and the crossbeam. In this way, the resultant force at the contact point is zero, and there is no tangential force on the transmission section, i.e. after the narrow belt is tensioned, there is no force to push the spiral plate 5 in the opposite direction, and the spiral plate 5 will stably contact the crossbeam. In addition, under the entire tensioning state, the pawl 602 is not under force, but the spiral plate 5 transmits the force to the rotating shaft 3, which then transmits it to the support plate 4.
[0077] The utility model embodiment further provides a belt conveying assembly, referring to Figure 3 and Figure 4 , the belt conveying assembly comprises two support plates 4 and a belt tensioning mechanism; the two support plates 4 are parallel to each other and symmetrically distributed; the support plate 4 is provided with a through hole 401, a sliding groove 402 and an arc-shaped groove; the rotating shaft 3 is arranged in the through hole 401, and the side beam of the sliding frame 2 is slidably connected to the support plate 4 through the sliding groove 402; the adjusting rod 603 is arranged in the arc-shaped groove, and when the pawl 602 is lifted and lowered, the adjusting rod 603 slides upward or downward along the extension direction of the arc-shaped groove.
[0078] Since the belt conveying assembly includes a belt tensioning mechanism, the technical advantages and effects achieved by the belt conveying assembly also include those achieved by the belt tensioning mechanism described above, which will not be repeated here.
[0079] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A belt tensioning mechanism, characterized by, It comprises: a tension pulley (1), a sliding frame (2) and a rotating shaft (3); the tension pulley (1) is rotationally connected with the sliding frame (2) to rotate around its own axis; the sliding frame (2) is slidably connected with two support plates (4) and the sliding path is perpendicular to the axis of the tension pulley (1); the two ends of the rotating shaft (3) are rotationally connected with the two support plates (4), and the rotating shaft (3) is also drivingly connected with the sliding frame (2) to drive the sliding frame (2) to slide linearly on the support plates (4) under the condition of rotating around its own axis.
2. The belt tensioning mechanism according to claim 1, wherein a driving surface extending along the circumferential direction of the rotating shaft (3) is arranged on the rotating shaft (3), the driving surface is in contact with the sliding frame (2), the distance between the driving surface and the axis of the rotating shaft (3) is R, and the R increases in sequence along the extension direction.
3. The belt tensioning mechanism according to claim 2, wherein two helical plates (5) are fixed on the side surface of the rotating shaft (3) and are parallel to each other; the driving surface is formed on the helical plates (5).
4. The belt tensioning mechanism according to claim 3, wherein the driving surface is divided into a plurality of driving sections in sequence along the extension direction, and the R of the plurality of driving sections increases in equal difference.
5. The belt tensioning mechanism according to claim 1, wherein the belt tensioning mechanism further comprises a stop assembly (6), the stop assembly (6) is arranged on the support plate (4) and is configured to prevent the rotating shaft (3) from reversing after the rotating shaft (3) is rotated to a position.
6. The belt tensioning mechanism according to claim 5, wherein the stop assembly (6) comprises a ratchet wheel (601) and a pawl (602); the ratchet wheel (601) is coaxially arranged on the rotating shaft (3) and is fixed on the rotating shaft (3); the pawl (602) is rotationally connected with the support plate (4) through a rotating shaft and can rotate around the axis of the rotating shaft under the action of its own gravity to be inserted into the tooth groove of the ratchet wheel (601).
7. The belt tensioning mechanism according to claim 6, wherein an adjusting rod (603) is fixed on the pawl (602), the free end of the adjusting rod (603) extends along the axial direction of the rotating shaft and penetrates through the support plate (4).
8. The belt tensioning mechanism according to claim 1, wherein the sliding frame (2) comprises an integral cross beam and two side beams; the rotating shaft (3) is drivingly connected with the cross beam; the two side beams are parallel to each other and are fixed on the two ends of the cross beam in a vertical posture; the two side beams are slidably connected with the two support plates (4) respectively.
9. The belt tensioning mechanism according to claim 8, wherein the tension pulley (1) is between the two side beams and is rotationally connected with the two side beams.
10. A belt conveyor assembly characterized by, It comprises two support plates (4) and the belt tensioning mechanism according to any one of claims 1 to 9; the two support plates (4) are parallel to each other and are symmetrically distributed. The support plate (4) is provided with a through hole (401) and a sliding groove (402); The rotating shaft (3) is arranged in the through hole (401), and the sliding frame (2) is arranged in the sliding groove (402).