Anti-jump sprocket chain drive

Abstract

The present application relates to a kind of anti-jumping sprocket chain drive mechanism, including transmission chain, each chain link of transmission chain includes: outer chain plate, abuts on the outer wall of inner chain plate and parallel to each other;Inner chain plate, abuts on the inner wall of outer chain plate and parallel to each other, the end of inner chain plate away from chain pin is welded with the end of outer chain plate away from chain pin as a whole;Engaging block, between two inner chain plates and axial two sides are fixed with inner chain plate, and its drive side is equipped with the driving plane of driving side of driving sprocket;Chain pin, from the pin hole of outer chain plate, inner chain plate and engaging block, and with inner chain plate and engaging block form rotary pair. The upper part of engaging block driving side drives driven sprocket by driving plane of driving side;The intersection line of driving side inclined plane and driving plane of driving side is located at 3 / 4 to 4 / 5 of the height of engaging block. The present application can smoothly enter or separate when the central angle corresponding to adjacent chain tooth is small, avoid the occurrence of skip tooth, and the transmission load is large.

Description

Technical Field

[0001] This invention relates to a chain drive mechanism, and more particularly to an anti-skipping chain drive mechanism, belonging to the technical field of transmission mechanisms. Background Technology

[0002] Baking production lines require high-temperature baking of food. Hot food removed from the oven cannot be packaged immediately; it needs to undergo a prolonged cooling and conveying process before being packaged. Tower screw conveyors, with their compact footprint, provide long conveying distances, thus allowing for extended cooling times, and are therefore widely used in the food baking industry.

[0003] Chinese invention patent CN 113148310B discloses a transmission chain and a tower screw conveyor. The transmission chain includes multiple chain links connected in sequence. Each chain link includes a pair of parallel outer chain plates. The ends of two adjacent outer chain plates are hinged to each other through an inner joint. The left end of the inner joint is a pair of parallel inner chain plates. The inner chain plates are attached to the inner right end of the previous pair of outer chain plates and are connected to each other. The right end of the inner joint is the meshing end. The meshing end is located between the left ends of the next pair of outer chain plates and is hinged to each other through a chain pin. The meshing end is provided with an oblique meshing surface.

[0004] In a tower screw conveyor, the rotation of the rotating drum is achieved by the main drive sprocket driving the driven sprocket through a transmission chain. The driven sprocket is fixed below the rotating drum. Due to the large transmission ratio between the main drive sprocket and the driven sprocket, the diameter of the driven sprocket can be as large as 2 meters or more, and the number of teeth can be as high as 200 or more. The central angle between adjacent teeth of the large driven sprocket is very small. When the load is large, especially between the transmission chain and the driven sprocket, tooth skipping is likely to occur, causing equipment vibration and affecting the stability of the transmission. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide an anti-skipping chain transmission mechanism. When the central angles of adjacent chain teeth are small, they can smoothly enter or disengage, avoiding skipping, and transmitting a large load.

[0006] To solve the above technical problems, the present invention provides an anti-skid chain transmission mechanism, comprising a transmission chain, each link of the transmission chain comprising: an outer chain plate, which abuts against the outer wall of an inner chain plate and is parallel to each other; an inner chain plate, which abuts against the inner wall of an outer chain plate and is parallel to each other, wherein the end of the inner chain plate away from the chain pin is welded to the end of the outer chain plate away from the chain pin; a meshing block, which is located between the two inner chain plates and is fixed to the inner chain plates on both axial sides, and its driving side is provided with a driving side driving plane for driving the driven sprocket; and a chain pin, which passes through the pin holes of the outer chain plate, the inner chain plate and the meshing block, and forms a rotating pair with the inner chain plate and the meshing block.

[0007] As an improvement of the present invention, the meshing blocks are provided with square bosses along their axial direction, and the square bosses are respectively embedded in the square holes of the corresponding inner chain plates.

[0008] As a further improvement of the present invention, the meshing block includes: a top edge of the meshing block, which is flush with the top edge of the inner chain plate; an active side of the meshing block, the upper part of which drives the driven sprocket through the active side driving plane; a bottom edge of the meshing block, which is flush with the bottom edge of the inner chain plate; and a driven side of the meshing block, which is provided with a driven side driving slope for driving the active sprocket, the upper end of which smoothly transitions to the top edge of the meshing block through a driven side arc surface.

[0009] As a further improvement of the present invention, the active side driving plane is perpendicular to the top edge of the meshing block; when the chain tooth meshing surface of the driven sprocket meshes with the active side driving plane of the meshing block, it is perpendicular to the top edge of the inner chain plate.

[0010] As a further improvement of the present invention, the active side of the meshing block is also provided with an active side inclined surface and an active side arc surface. The active side inclined surface is connected to the lower part of the active side driving plane and smoothly transitions to the bottom edge of the inner chain plate through the active side arc surface.

[0011] As a further improvement of the present invention, the lower end of the active side slope is inclined in the opposite direction to the forward direction of the chain link, and the boundary line between the active side slope and the active side drive plane is located at 3 / 4 to 4 / 5 of the height of the meshing block.

[0012] As a further improvement of the present invention, the angle between the active side inclined plane and the active side driving plane is 8° to 10°.

[0013] As a further improvement of the present invention, the pitch of the driven sprocket is smaller than the pitch of the transmission chain. The accumulated difference leaves a gap between the teeth of the driven sprocket and the active side of the meshing block of the transmission chain when they engage, thus avoiding interference.

[0014] As a further improvement of the present invention, the base circle thickness of the driven sprocket is greater than the thickness of the chain teeth, and the bottom of the inner chain plate of the transmission chain is supported on the steps on both sides of the chain teeth.

[0015] As a further improvement of the present invention, each chain tooth of the driven sprocket is provided with an arc-shaped tooth root connected to the base circle, and a tooth root groove is provided on the circumference of the base circle on the side where the chain tooth meshing surface is located. Each tooth root groove and the corresponding arc-shaped tooth root are smoothly transitioned. When the chain link of the transmission chain disengages from the chain tooth of the driven sprocket, the meshing block rotates around the chain pin, and the tooth root groove provides a receiving space for the bottom edge of the meshing block.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The active sprocket drives the driven side driving inclined surface of the meshing block, and the active side driving plane of the meshing block drives the driven sprocket, realizing unidirectional transmission and power transmission, and the chain links can be reliably transmitted regardless of whether they are odd or even.

[0017] 2. When the driving plane of the active side engages with the meshing surface of the chain teeth of the driven sprocket, no component force is generated that squeezes the chain outward circumference, so that the chain is reliably wrapped around the driven sprocket and avoids outward expansion that causes tooth skipping.

[0018] 3. When the transmission chain disengages, the disengaged chain link is pulled outward, causing the engagement block that is about to disengage to rotate around the chain pin. The top of the drive plane on the active side tilts backward relative to the forward direction, which facilitates the chain link to disengage outward.

[0019] 4. When the engagement block rotates around the chain pin to disengage the chain link, the corner where the bottom edge of the engagement block intersects with the driven side drive slope can be accommodated in the tooth root groove of the driven sprocket, thus preventing the rotation of the engagement block relative to the chain pin from being obstructed. Attached Figure Description

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0021] Figure 1 This is a perspective view of the anti-skid toothed chain transmission mechanism of the present invention;

[0022] Figure 2 This is a front view of the anti-skipping tooth chain transmission mechanism of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of the engagement point of the transmission chain;

[0024] Figure 4 for Figure 2 Enlarged view of the disengagement point of the transmission chain;

[0025] Figure 5 This is a perspective view of the driven wheel portion in this invention;

[0026] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0027] Figure 7 This is an exploded view of a link in a transmission chain.

[0028] In the diagram: 1. Drive chain; 1a. Outer chain plate; 1b. Inner chain plate; 1b1. Square hole; 1c. Meshing block; 1c1. Top edge of meshing block; 1c2. Driving side drive plane; 1c3. Driving side inclined surface; 1c4. Driving side arc surface; 1c5. Bottom edge of meshing block; 1c6. Driven side drive inclined surface; 1c7. Driven side arc surface; 1c8. Square boss; 1d. Chain pin; 2. Driven sprocket; 2a. Base circle; 2a1. Tooth root groove; 2b. Chain tooth; 2b1. Chain tooth meshing surface; 3. Driving sprocket. Detailed Implementation

[0029] In the following description of the present invention, the terms "upper", "lower", "front", "rear", 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 the present invention and simplifying the description, and do not mean that the structure must have a specific orientation. In this document, the tooth tip of the chain tooth is referred to as "upper" and the tooth root as "lower".

[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0032] like Figures 1 to 7 As shown, the anti-skid chain transmission mechanism of the present invention includes a transmission chain 1 and a driven sprocket 2. Each link of the transmission chain 1 includes an outer chain plate 1a, an inner chain plate 1b, a meshing block 1c, and a chain pin 1d. The two outer chain plates 1a are respectively attached to the outer wall of the inner chain plate 1b and are parallel to each other. The two inner chain plates 1b are respectively attached to the inner wall of the outer chain plate 1a and are parallel to each other. The end of the inner chain plate 1b away from the chain pin 1d is welded to the end of the outer chain plate 1a away from the chain pin 1d as a whole. Odd-numbered or even-numbered chain links form a loop.

[0033] The meshing block 1c is located between the two inner chain plates 1b. The meshing block 1c is provided with square bosses 1c8 in the axial direction. The square bosses 1c8 are respectively embedded in the square holes 1b1 of the corresponding inner chain plates 1b, so as to realize the fixed connection between the two sides of the meshing block 1c and the inner chain plates 1b.

[0034] The meshing block 1c has a top edge 1c1, a driving side, a bottom edge 1c5, and a driven side. The top edge 1c1 is flush with the top edge of the inner chain plate 1b, and the bottom edge 1c5 is flush with the bottom edge of the inner chain plate 1b. That is, the top edge 1c1 and the bottom edge 1c5 are parallel to each other.

[0035] The active side of the meshing block includes, from top to bottom, an active side driving plane 1c2, an active side inclined surface 1c3, and an active side arc surface 1c4. The active side driving plane 1c2 at the top of the active side of the meshing block drives the chain tooth meshing surface 2b1 of the driven sprocket 2, causing the driven sprocket 2 to rotate accordingly.

[0036] When a tooth skips in transmission chain 1, it will inevitably climb towards the outer circumference of the sprocket first. The skip occurs when it climbs past the tooth tip. In this transmission mechanism, the driving side drive plane 1c2 is perpendicular to the top edge 1c1 of the meshing block. When the chain tooth meshing surface 2b1 of the driven sprocket 2 meshes with the driving side drive plane 1c2 of the meshing block 1c, it is perpendicular to the top edge of the inner chain plate 1b. This ensures that when the driving side drive plane 1c2 of the meshing block 1c meshes with the chain tooth meshing surface 2b1, no radial force is generated along the driven sprocket 2. That is, during meshing and transmission, transmission chain 1 will not experience a pushing force from the chain teeth 2b towards the outer circumference. During meshing and transmission, transmission chain 1 can firmly wrap around the circumference of the sprocket and will not climb towards the outer circumference, thus eliminating the tooth skipping phenomenon.

[0037] The meshing part of the aforementioned transmission chain 1 and driven sprocket 2 actually forms a structure similar to a barb. Although radial thrust is avoided, if the height occupied by the active side drive plane 1c2 is too large, it will cause difficulty in disengaging.

[0038] To ensure smooth disengagement, the lower end of the active side inclined surface 1c3 is tilted in the opposite direction to the forward direction of the chain link. The boundary line between the active side inclined surface 1c3 and the active side drive plane 1c2 is located at 3 / 4 to 4 / 5 of the height of the meshing block 1c. That is, only 1 / 5 to 1 / 4 of the height of the active side of the meshing block is used for meshing drive, preferably 1 / 4. Tests have shown that the active side drive plane 1c2 occupying 1 / 4 of the height of the active side of the meshing block is sufficient to complete the transmission function and meet the full load requirements.

[0039] The lower end of the active side inclined surface 1c3 is tilted backward. When the transmission chain 1 disengages from the driven sprocket 2, the active side of the meshing block rotates relative to the chain tooth 2b at the inflection point. The active side driving plane 1c2 forms an angle with the upper part of the chain tooth meshing surface 2b1. At this time, the active side inclined surface 1c3 avoids scraping the lower part of the chain tooth meshing surface 2b1.

[0040] The angle between the active side inclined surface 1c3 and the active side driving plane 1c2 is 8° to 10°, which facilitates disengagement. When disengaging, the active side driving plane 1c2 tilts back 8° to 10°, and the active side inclined surface 1c3 does not interfere with the chain tooth meshing surface 2b1 of the driven sprocket 2, so that the chain link can smoothly disengage from the chain tooth 2b.

[0041] The active side inclined surface 1c3 is connected below the active side drive plane 1c2 and smoothly transitions to the bottom edge of the inner chain plate 1b through the active side arc surface 1c4, avoiding interference with the arc-shaped tooth root.

[0042] The lower end of the driven side of the meshing block is provided with a driven side driving ramp 1c6, and the upper end is provided with a driven side arc surface 1c7. The upper end of the driven side driving ramp 1c6 smoothly transitions to the top edge 1c1 of the meshing block through the driven side arc surface 1c7. The driven side driving ramp 1c6 is used to drive the transmission chain 1 forward by the drive sprocket 3, and the upper driven side arc surface 1c7 can match the arc head of the inner chain plate 1b.

[0043] The chain pin 1d passes through the pin holes of the outer chain plate 1a, the inner chain plate 1b and the meshing block 1c, and forms a rotating pair with the inner chain plate 1b and the meshing block 1c.

[0044] like Figure 3 As shown, the pitch of the driven sprocket 2 is smaller than the pitch of the transmission chain 1. The pitch difference leaves a gap between the teeth of the driven sprocket 2 and the active side of the meshing block of the transmission chain 1 when the teeth of the driven sprocket 2 engage, so that the chain teeth 2b can be smoothly embedded in the chain link.

[0045] Figure 4 This is an enlarged view of the disengagement point of the transmission chain. When the active driving plane 1c2 of the meshing block 1c of the next chain link moves forward against the meshing surface 2b1 of the next chain tooth 2b, a gap has appeared between the meshing surface 2b1 of the previous chain tooth 2b and the active driving plane 1c2 of the meshing block 1c, which facilitates smooth disengagement.

[0046] like Figure 6 As shown, the thickness of the base circle 2a of the driven sprocket 2 is greater than the thickness of the chain tooth 2b. The bottom of the inner chain plate 1b of the transmission chain 1 is supported on the steps on both sides of the chain tooth 2b, which not only supports the transmission chain 1 but also limits its movement. This makes the transmission chain 1 very stable when wrapped around the base circle 2a of the driven sprocket 2, reducing the jumping of the transmission chain 1 and further reducing the risk of tooth skipping.

[0047] Each tooth 2b of the driven sprocket 2 has an arc-shaped tooth root connected to the base circle 2a. A tooth root groove 2a1 is provided on the circumference of the base circle on the side where the tooth meshing surface 2b1 is located. Each tooth root groove 2a1 smoothly transitions to the corresponding arc-shaped tooth root, and the inner arc surface of the tooth root groove 2a1 extends downward from the outer arc surface of the arc-shaped tooth root. When the link of the transmission chain 1 disengages from the tooth 2b of the driven sprocket 2, the meshing block 1c rotates around the chain pin 1d. The tooth root groove 2a1 provides space for the bottom edge 1c5 of the meshing block, preventing the corner where the bottom edge 1c5 of the meshing block intersects with the driven side driving inclined surface 1c6 from hitting the base circle 2a of the driven sprocket 2 when the meshing block 1c rotates, thus avoiding friction or collision.

[0048] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A toothed chain transmission mechanism for preventing tooth skipping, comprising a transmission chain, characterized in that, Each link of the transmission chain includes: The outer chain plate is attached to the outer wall of the inner chain plate and is parallel to it; The inner chain plate is attached to the inner wall of the outer chain plate and is parallel to each other. The end of the inner chain plate away from the chain pin is welded to the end of the outer chain plate away from the chain pin. The meshing block is located between the two inner chain plates and is fixed to the inner chain plates on both sides of the axial direction. Its driving side is provided with an active driving plane that drives the driven sprocket. The chain pin passes through the pin holes of the outer chain plate, inner chain plate and meshing block, and forms a rotating pair with the inner chain plate and meshing block; The active driving plane is perpendicular to the top edge of the meshing block; when the chain tooth meshing surface of the driven sprocket meshes with the active driving plane of the meshing block, it is perpendicular to the top edge of the inner chain plate. The active side of the meshing block is also provided with an active side inclined surface and an active side arc surface. The active side inclined surface is connected to the lower part of the active side driving plane and smoothly transitions to the bottom edge of the inner chain plate through the active side arc surface. The angle between the active side inclined surface and the active side driving plane is 8° to 10°. The lower end of the active side slope is inclined in the opposite direction to the forward direction of the chain link, and the boundary line between the active side slope and the active side drive plane is located at 3 / 4 to 4 / 5 of the height of the meshing block. The base circle thickness of the driven sprocket is greater than the thickness of the chain teeth, and the bottom of the inner chain plate of the transmission chain is supported on the steps on both sides of the chain teeth. Each tooth of the driven sprocket has an arc-shaped tooth root connected to the base circle. On the circumference of the base circle on the side where the tooth meshing surface is located, there is a tooth root groove. Each tooth root groove and the corresponding arc-shaped tooth root are smoothly transitioned. When the chain link of the drive chain disengages from the chain tooth of the driven sprocket, the meshing block rotates around the chain pin, and the tooth root groove provides a space for the bottom edge of the meshing block. The meshing blocks are provided with square bosses along their axial direction, and the square bosses are respectively embedded in the square holes of the corresponding inner chain plates; the meshing blocks include the following around their perimeter: The top edge of the meshing block is flush with the top edge of the inner chain plate; On the active side of the meshing block, the upper part drives the driven sprocket through the active side driving plane; The bottom edge of the meshing block is flush with the bottom edge of the inner chain plate; The driven side of the meshing block is provided with a driven side driving ramp for the driving sprocket. The upper end of the driven side driving ramp smoothly transitions to the top edge of the meshing block through the driven side arc surface.

2. The anti-skip toothed chain transmission mechanism according to claim 1, characterized in that: The pitch of the driven sprocket is smaller than that of the transmission chain. The accumulated difference creates a gap between the teeth of the driven sprocket and the active side of the meshing block of the transmission chain when they engage, thus avoiding interference.

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