A chip grading and buffering anti-tearing device for a large-span round pile conveyor

Abstract

This invention provides a wood chip grading, buffering, and tear-prevention device for a large-span circular stacker conveyor, relating to the field of bulk material conveying protection technology. It includes a device body and a conveyor belt, with the conveyor belt mounted below the device body via a conveyor fixing frame. The device body includes a material collection and guiding assembly, a three-stage segmented buffer assembly, and an elastic shock-absorbing mounting assembly. The three-stage segmented buffer assembly includes a layered mounting main frame, buffer rollers, multi-component layered support brackets, and multi-component segmented limiting partitions. The material collection and guiding assembly includes a top guiding hopper and side guiding barriers. The elastic shock-absorbing mounting assembly includes elastic shock-absorbing supports and a rubber-coated layer for the rollers. The beneficial effects of this invention are: by using three layers of staggered buffer rollers, a non-straight-through material drop channel is formed; by relying on differentiated spacing, wood chip grading and stress relief are achieved, avoiding vertical impact of sharp-edged wood chips on the conveyor belt, evenly distributing the drop load, preventing concentrated material impact, effectively preventing the conveyor belt from being punctured or damaged, and extending its service life.

Description

Technical Field

[0001] This invention mainly relates to the field of bulk material conveying protection technology, specifically to a wood chip grading buffer and tear-proof device for a large-span circular stacker conveyor. Background Technology

[0002] Large-span circular stacker conveyors are widely used in papermaking raw material yards, wood chip storage and transfer production lines. These conveyors are usually arranged in an overhead span configuration, with wood chips falling directly from the upstream drop point to the area where the conveyor belt is located below, in order to complete continuous conveying operations.

[0003] In wood chip conveying operations, the raw wood chips, after being crushed, are typically characterized by sharp edges, irregular shapes, and loose accumulation. In existing technologies, common solutions include setting up a single-layer buffer roller bed or a fixed guide baffle in the material drop area to reduce the direct impact of the material on the conveyor belt.

[0004] In the above-mentioned solution, the single-layer buffer roller bed has the problem of a single buffer level. The fundamental reason is that the impact load of wood chips falling from a height is concentrated on a single-stage bearing structure, lacking a buffering process that gradually disperses and dissipates energy along the falling path. As a result, the sharp-edged wood chips still have a large impact velocity before falling onto the conveyor belt, which can easily cause scratches and longitudinal tears on the surface of the conveyor belt. Moreover, because the wood chips are irregular in shape and easily overlap, the fixed baffle lacks the ability to flexibly buffer and disperse the falling path of the wood chips, which can easily lead to material accumulation and blockage, further aggravating the damage to the conveyor belt and affecting the service life of the equipment. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve: This invention provides a wood chip grading, buffering, and tear-prevention device for a large-span circular stacker conveyor, in order to solve the technical problems existing in the background art.

[0006] 2. Technical Solution: To achieve the above objectives, the technical solution provided by this invention is as follows: a wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor, comprising a device body and a conveyor belt, wherein the conveyor belt is mounted below the device body via a conveyor fixing frame; the device body includes a material collection and guiding assembly, a three-stage segmented buffer assembly, and an elastic shock-absorbing mounting assembly; the three-stage segmented buffer assembly includes a layered mounting main frame, buffer rollers, multi-group layered support sub-supports, and multi-group segmented limiting partitions; the layered mounting main frame is fixed to the upper end of the conveyor fixing frame by fasteners; multiple sets of layered support sub-supports are fixedly arranged on the inner walls of both sides of the layered mounting main frame; the segmented limiting partitions are fixed within the layered mounting main frame along the conveying width direction and divide its inner cavity. The system is divided into several segmented isolation chambers. The buffer rollers in each group are arranged in upper, middle, and lower layers to buffer the wood chips from top to bottom in a step-by-step collision manner. The material collection and guiding assembly includes a top guide hopper and side guide barriers. The top guide hopper is connected and fixed to the top of the layered installation main frame. The side guide barriers are set on the left and right side walls of the layered installation main frame to form a material drop channel. Bottom limiting strips are installed on the inner side of the bottom end of the layered installation main frame, and a discharge gap is formed between the bottom limiting strips. The elastic shock absorption installation assembly includes an elastic shock absorption support and a roller buffer rubber covering layer. The outer wall of each buffer roller is fully covered by the roller buffer rubber covering layer. Each buffer roller is installed on the layered support sub-support through the elastic shock absorption support.

[0007] Furthermore, the buffer roller is divided into three layers along the falling height of the wood chips: an upper coarse buffer roller, a middle transition buffer roller, and a lower fine buffer roller. The three layers of buffer rollers are staggered in the vertical direction, and the axial height of the upper buffer roller is higher than that of the middle buffer roller, which is higher than that of the lower buffer roller.

[0008] Furthermore, the horizontal spacing between the upper buffer rollers is greater than the horizontal spacing between the middle buffer rollers and the lower buffer rollers.

[0009] Furthermore, the segmented limiting partition is a steel upright plate structure, and the upper end of the segmented limiting partition is welded and fixed to the top frame of the layered installation main frame. The two adjacent segmented isolation compartments are physically separated by the segmented limiting partition.

[0010] Furthermore, the lower end of the elastic damping support is fixed to the layered support sub-bracket, and the other end is rotatably hinged to the end of the roller shaft of the buffer roller.

[0011] Furthermore, the top guide hopper is a conical hopper structure that is wider at the top and narrower at the bottom, and the lower port of the top guide hopper is sealed and connected to the top opening of the layered mounting main frame.

[0012] Furthermore, the lateral guide barrier extends downward to both sides of the buffer roller, forming a closed material discharge channel with the buffer roller.

[0013] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this invention has the following advantages: This device employs three layers of interlaced buffer rollers to form a non-straight-through material drop channel. Combined with a differentiated spacing layout, it achieves graded and step-by-step unloading of wood chips: large pieces of wood chips are first impacted and broken up by the upper layer of wide-spacing rollers, while small and medium-sized particles are further finely dissipated through the middle and lower layer rollers for secondary and tertiary energy dissipation, preventing large, angular pieces of wood chips from vertically impacting the conveyor belt. The outer wall of the buffer rollers is covered with a rubber buffer layer, and each roller floats and absorbs energy through an elastic shock-absorbing support with built-in springs. This double flexible buffer significantly reduces the impact kinetic energy of falling wood chips. At the same time, multi-group segmented limiting partitions divide the entire machine into independent segmented isolation chambers, evenly distributing the material drop load along the conveyor belt width. This eliminates the defect of localized concentrated impact of materials on the conveyor belt, effectively preventing the conveyor belt from being punctured or damaged by wood chips, and significantly extending the service life of the conveyor belt.

[0014] It should be noted that the structures not described in this invention are not related to the design points and improvement directions of this invention, and are the same as or can be implemented using existing technologies, and will not be elaborated here. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a partial structural diagram of the present invention from another angle; Figure 4 This is a schematic diagram of the buffer roller structure of the present invention; Figure 5 This is a cross-sectional view of the elastic damping support structure of the present invention.

[0016] Figure label: 1. Buffer rollers; 2. Layered main frame; 3. Conveyor fixed frame; 4. Conveyor belt; 5. Segmented isolation compartments; 6. Layered support sub-brackets; 7. Segmented limiting partitions; 8. Side guide barriers; 9. Elastic shock-absorbing supports; 10. Buffer rubber coating layer for rollers; 11. Top guide collection hopper; 12. Bottom limiting stop bars. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] See attached document Figure 1-5A wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor includes a device body and a conveyor belt 4. The conveyor belt 4 is located below the device body via a conveyor fixing frame 3. The device body includes a material collection and guiding component, a three-stage segmented buffer component, and an elastic shock-absorbing mounting component. The three-stage segmented buffer component includes a layered mounting main frame 2, buffer rollers 1, multi-component layered support sub-supports 6, and multi-component segmented limiting partitions 7. The layered mounting main frame 2 is fixed to the main beam or crossbeam of the conveyor fixing frame 3 by fasteners. The multi-component layered support sub-supports 6 are fixedly installed on the inner walls of both sides of the layered mounting main frame 2. The segmented limiting partitions 7 are fixed inside the layered mounting main frame 2 along the conveying width direction and divide its inner cavity into several segmented isolation chambers. 5. Each set of buffer rollers 1 is arranged in upper, middle and lower layers to buffer the wood chips from top to bottom in a step-by-step collision. The material collection and guiding assembly includes a top guide collection hopper 11 and a side guide enclosure 8. The top guide collection hopper 11 is connected and fixed to the top of the layered installation main frame 2. The side guide enclosure 8 is set on the left and right side walls of the layered installation main frame 2 to form a material drop channel. A bottom limiting strip 12 is installed on the inner side of the bottom end of the layered installation main frame 2, and a discharge gap is formed between the bottom limiting strips 12. The elastic shock absorption installation assembly includes an elastic shock absorption support 9 and a roller buffer rubber covering layer 10. The outer wall of each buffer roller 1 is fully covered with the roller buffer rubber covering layer 10. Each buffer roller 1 is installed on the layered support sub-support 6 through the elastic shock absorption support 9.

[0022] The device is set up in the dedicated wood chip dropping area above the conveyor belt 4 of the large-span circular stacker conveyor, specifically in the free dropping space between the upstream guide chute outlet and the conveyor belt 4. The main load-bearing structure of the device is a layered installation main frame 2, which is fastened to the main beam or crossbeam of the conveyor fixed frame 3 by high-strength bolts, thus completing the addition and installation without changing the original main structure of the conveyor.

[0023] The device, from top to bottom, includes a top guide hopper 11, a material drop channel enclosed by lateral guide barriers 8, a three-level segmented buffer area set inside the layered installation main frame 2, and a bottom limiting stop bar 12 set on the inner side of the bottom end of the layered installation main frame 2. The layered installation main frame 2 preferably adopts a frame structure welded from rectangular square tubes and channel steel, taking into account both overall rigidity and on-site hoisting weight. The width direction of the layered installation main frame 2 is consistent with the width direction of the conveyor belt 4.

[0024] Multiple sets of segmented limiting partitions 7 are arranged inside the layered installation main frame 2 along the width direction of the conveyor belt 4. The upper end of each segmented limiting partition 7 is welded and fixed to the top frame of the layered installation main frame 2. A segmented isolation chamber 5 is formed between two adjacent segmented limiting partitions 7. In this embodiment, the segmented limiting partitions 7 make at least 3 segmented isolation chambers 5 formed inside the layered installation main frame 2.

[0025] The layered support sub-support 6 is divided into three layers: upper, middle and lower, which are fixed to the inner walls of both sides of the segmented isolation chamber 5. The layered support sub-support 6 can adopt an L-shaped support structure. The upper layer layered support sub-support 6 is used to install the upper coarse buffer roller, the middle layer layered support sub-support 6 is used to install the middle transition buffer roller, and the lower layer layered support sub-support 6 is used to install the lower fine buffer roller. The installation height of the three layers is configured according to the drop height and the average particle size of the wood chips. The upper layer is reserved with sufficient first-stage collision stroke, while the middle and lower layers are mainly used to further intercept penetrating materials and shorten the residual drop.

[0026] The buffer roller 1 is installed inside the layered installation main frame 2. The horizontal spacing of the upper buffer roller 1 is greater than that of the middle buffer roller 1 and the lower buffer roller 1, so that large pieces of wood chips can be broken up after impact in the first layer, while smaller wood chips and already dispersed wood chips continue to fall into subsequent layers. The projections of the upper and lower buffer rollers are staggered, thereby preventing the wood chips from forming a straight impact path in the vertical direction.

[0027] The buffer roller 1 adopts a conventional roller structure with a steel roller body, roller shafts at both ends, and built-in bearing seats. In order to improve the flexible contact capability with the angular wood chips, the outer wall of each buffer roller 1 is fully covered with a roller buffer rubber coating layer 10. The roller buffer rubber coating layer 10 is fixed to the outer wall of the buffer roller 1 by hot vulcanization rubber coating, or it can be fixed by mechanical locking and adhesive bonding to prevent local detachment after long-term impact.

[0028] Each buffer roller 1 is installed on the corresponding layer support sub-support 6 via an elastic damping support 9. The elastic damping support 9 includes a support shell, an embedded damping spring, a floating seat, and a rotating hinge. The support shell of the elastic damping support 9 is fixed to the layer support sub-support 6, and the upper rotating hinge is hinged to the roller shaft end of the buffer roller 1. The elastic damping support 9 provides additional displacement energy absorption when the wood chip is impacted, and avoids excessive displacement of the buffer roller 1, which may lead to interlayer collision or uneven wear.

[0029] The top guide hopper 11 is fixed to the top of the layered installation main frame 2, and its lower port is sealed and connected to the top opening of the layered installation main frame 2. The top guide hopper 11 has a cone structure that is wider at the top and narrower at the bottom, which can take into account both the natural sliding of wood chips and prevent material from sticking to the inner wall. If the moisture content of the wood chips is high, the inner wall of the top guide hopper 11 can be further lined with a polymer wear-resistant liner to reduce frictional resistance and reduce the probability of material adhesion and accumulation.

[0030] The side guide barriers 8 are respectively set at an angle on the left and right side walls of the layered installation main frame 2 through hinged seats, and extend downward to the side position of the lower buffer roller 1. The side guide barriers 8 on both sides together form a closed material drop channel, which can effectively restrain the horizontal splashing of wood chips and keep the wood chips in the buffer area. The side guide barriers 8 can adjust the tilt angle according to the usage requirements to avoid interference with the buffer roller 1 due to the small gap.

[0031] The bottom limiting baffle 12 is horizontally fixed to the inner side of the bottom of the layered installation main frame 2, and forms a discharge gap between adjacent baffles. After three-stage buffering, the regular wood chips fall smoothly, while preventing large abnormal pieces of material that have not been fully dispersed from directly impacting the conveyor belt 4. After three collisions in the upper, middle and lower layers, the overall speed of the wood chips has been reduced. The bottom limiting baffle 12 further rectifies the discharge, allowing the wood chips to fall onto the surface of the conveyor belt 4 in a more uniform planar distribution, which further reduces the additional effect of localized concentrated impact.

[0032] The specific working path of this implementation method is as follows: After falling from above, the wood chips first enter the top guide hopper. Utilizing the hopper's conical structure (wider at the top and narrower at the bottom), the scattered wood chips gradually gather towards the center, then enter the enclosed drop channel formed by lateral guide barriers on both sides. The inclined barriers effectively constrain the material's trajectory, preventing wood chips from splashing to the sides and ensuring all material enters the buffer zone below stably.

[0033] The material falls continuously along the discharge channel, passing through three layers of buffer rollers in sequence. Larger wood chips with higher kinetic energy strike the upper buffer roller first, absorbing energy and dissipating force through the combined action of the rubber coating on the outside of the roller and the elastic shock-absorbing support at the bottom, while breaking up clumps and large pieces of wood chips. The material that is not intercepted continues to fall, contacting the middle and lower buffer rollers in turn, gradually completing diversion and fine energy dissipation. The staggered arrangement of the rollers also completely blocks the vertical path of the material.

[0034] After undergoing three stages of buffering and deceleration, the wood chips finally reach the bottom of the device and fall smoothly through the discharge gap between the bottom limit bars. The bars can intercept a few large pieces of material that are not fully broken up, while rectifying and sorting the overall material, so that the wood chips fall onto the conveyor belt surface in a uniform planar shape, greatly reducing localized concentrated impact and completing the entire material dropping and buffering process.

[0035] In another embodiment, when the drop height is 3m to 5m, a layout of 3 segmented isolation chambers 5 can be preferred, and the number of upper buffer rollers 1 can be less than the number of middle and lower buffer rollers 1 to obtain a larger first-layer material passage space. When the drop height is 5m to 8m, a layout of 4 to 5 segmented isolation chambers 5 can be preferred, and the total number of three-layer buffer rollers 1 can be appropriately increased to increase the total number of contact times and the total energy consumption path. The greater the drop height, the higher the impact speed of the wood chips, and a more sufficient load distribution channel needs to be provided in both the width and height directions, which further brings the additional effect of stronger adaptability to large drop conditions.

[0036] In another embodiment, if a small number of long strips of wood chips or fiber bundles are mixed in with the wood chips on site, the bottom limiting strip 12 can be a replaceable structure, that is, it can be connected to the inner side of the bottom of the layered installation main frame 2 by bolts; when it is found that the discharge gap is not suitable for the current material gradation, the bottom limiting strip 12 of different width specifications can be replaced to adjust the discharge gap. Its core is still to prevent large abnormal material from directly hitting the conveyor belt 4 by limiting the bottom discharge shape.

[0037] In another embodiment, the elastic element of the elastic damping support 9 is not limited to a damping spring, but can also be replaced by a rubber damping pad, a polyurethane elastic block, a rubber-metal composite damping element, or a small-stroke spring damping element; correspondingly, the material of the roller buffer rubber covering layer 10 can also be adjusted to natural rubber, nitrile rubber, or a polyurethane elastic layer according to temperature and wear resistance requirements.

[0038] The above-described embodiments are merely illustrative of certain implementations of the present invention, and are described in a relatively specific and detailed manner. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor, comprising a device body and a conveyor belt (4), characterized in that: The conveyor belt (4) is located below the device body via the conveyor fixing frame (3); the device body includes a material collection and guiding component, a three-stage segmented buffer component, and an elastic shock-absorbing installation component; the three-stage segmented buffer component includes a layered installation main frame (2), buffer rollers (1), multi-group layered support sub-supports (6), and multi-group segmented limiting partitions (7). The layered installation main frame (2) is fixed to the upper end of the conveyor fixing frame (3) by fasteners. Multiple sets of layered support sub-supports (6) are fixedly installed on the inner walls of both sides of the layered installation main frame (2). The segmented limiting partitions (7) are fixed in the layered installation main frame (2) along the conveying width direction and divide its inner cavity into several segmented isolation chambers (5). Each set of buffer rollers (1) is arranged in upper, middle, and lower layers for use with wood chips. The collision buffer is implemented from top to bottom. The material guide assembly includes a top guide hopper (11) and a side guide enclosure (8). The top guide hopper (11) is connected and fixed to the top of the layered installation main frame (2). The side guide enclosure (8) is provided on the left and right side walls of the layered installation main frame (2) to form a material drop channel. A bottom limiting strip (12) is installed on the inner side of the bottom end of the layered installation main frame (2). A discharge gap is formed between the bottom limiting strips (12). The elastic shock absorption installation assembly includes an elastic shock absorption support (9) and a roller buffer rubber covering layer (10). The outer wall of each buffer roller (1) is fully covered by the roller buffer rubber covering layer (10). Each buffer roller (1) is installed on the layered support sub-support (6) through the elastic shock absorption support (9).

2. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 1, characterized in that: The buffer roller (1) is divided into three layers along the falling height of the wood chips: an upper coarse buffer roller, a middle transition buffer roller, and a lower fine buffer roller. The three layers of buffer rollers (1) are staggered in the vertical direction, and the axial height of the upper buffer roller (1) is higher than that of the middle buffer roller (1), and the axial height of the middle buffer roller (1) is higher than that of the lower buffer roller (1).

3. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 2, characterized in that: The horizontal spacing of the upper buffer roller (1) is greater than the horizontal spacing of the middle buffer roller (1) and the lower buffer roller (1).

4. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 1, characterized in that: The segmented limiting partition (7) is a steel plate structure. The upper end of the segmented limiting partition (7) is welded and fixed to the top frame of the layered installation host frame (2). The two adjacent segmented isolation chambers (5) are physically separated by the segmented limiting partition (7).

5. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 1, characterized in that: The lower end of the elastic damping support (9) is fixed to the layered support sub-support (6), and the other end is rotatably hinged to the end of the roller shaft of the buffer roller (1).

6. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 1, characterized in that: The top guide hopper (11) is a cone-shaped structure that is wider at the top and narrower at the bottom. The lower port of the top guide hopper (11) is sealed and connected to the top opening of the layered mounting frame (2).

7. The wood chip grading, buffering, and tear-resistant device for a large-span circular stacker conveyor according to claim 1, characterized in that: The lateral guide barrier (8) extends downward to both sides of the buffer roller (1), forming a closed material drop channel with the buffer roller (1).

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