Long distance web belt conveying device

Abstract

The application discloses a long-distance mesh belt conveying device, which comprises a driving roller and a driven roller, a driving wheel is installed on the driving roller, a driven wheel is installed on the driven roller, a conveying mesh belt is wound around the driving wheel and the driven wheel, a plurality of supporting rollers are arranged below a return section of the conveying mesh belt, a first supporting roller is arranged near the driving roller, a last supporting roller is arranged near the driven roller, the supporting rollers between the first supporting roller and the last supporting roller are arranged at unequal distances, and the distance between adjacent supporting rollers becomes larger as the supporting rollers are closer to the last supporting roller. In the running process of the long-distance mesh belt conveying device, the sag between the supporting rollers of the return section is relatively uniform, and the long-distance mesh belt conveying device can avoid being dragged on the ground.

Description

Technical Field

[0001] This invention relates to a long-distance mesh belt conveyor, belonging to the technical field of conveyor devices. Background Technology

[0002] Automobile factories typically use conveyor belts for vehicle assembly lines. The conveyor belt wraps around drive and driven rollers at both ends, with the wheelbase between the drive and driven rollers reaching over 100 meters. Pulled by the drive pulley on the drive roller, the upper layer of the conveyor belt moves from the driven roller to the drive roller, carrying vehicles and other goods forward. The lower layer of the conveyor belt is the return section, moving from the drive roller to the driven roller. During and before / after operation, the conveyor belt undergoes thermal expansion and contraction due to temperature changes. Besides the elongation caused by temperature rise, the heavy load on the upper layer of the conveyor belt also leads to an increase in its circumference. This elongated conveyor belt becomes stuck on the return trip, resulting in excessive sag and causing the bottom of the conveyor belt to touch the ground.

[0003] The current industry standard is to install multiple idlers below the return section of the conveyor belt. Each idler supports the conveyor belt on the return section, with a certain amount of elongation between adjacent idlers to prevent the bottom of the conveyor belt from sagging to the ground. Because the drive pulley needs to maintain a large wrap angle to generate significant traction on the conveyor belt, the first idler is usually positioned close to the drive pulley on the return section. The second idler is spaced further from the first, and the remaining idlers are arranged at equal intervals. The last idler is placed close to the driven pulley, similarly ensuring a proper wrap angle for the driven pulley.

[0004] On the return section, the mesh belt between the first and second idlers sags significantly due to its own weight. The tension generated by the weight of the sag mesh belt then drives the mesh belt that has disengaged from the drive pulley forward.

[0005] The above solutions have the following drawbacks: 1. In many cases, it is necessary to place a counterweight on the conveyor belt between the first and second idlers to increase the tension of this section of the conveyor belt and maintain the tension balance of the conveyor belt;

[0006] 2. Because the gap between the first and second idlers is much larger, the sag of the conveyor belt is concentrated in the inlet section of the return stroke. Excessive sag causes the bottom of the conveyor belt to drag on the ground. This phenomenon is even more serious when a counterweight is used.

[0007] 3. Ideally, a deep pit should be set in the ground between the first and second idlers to accommodate the sag of this section of the conveyor belt or counterweight. In most cases, site conditions do not allow this, and it is even more impossible to set a deep hole in the floor if the equipment is located on an upper floor. Summary of the Invention

[0008] The purpose of this invention is to overcome the problems existing in the prior art and provide a long-distance mesh belt conveyor that can make the sag between each idler roller in the return section more uniform during operation, thus avoiding dragging on the ground.

[0009] To solve the above technical problems, the present invention provides a long-distance mesh belt conveyor, comprising a drive roller and a driven roller. A drive wheel is mounted on the drive roller, and a driven wheel is mounted on the driven roller. A conveyor mesh belt is wrapped between the drive wheel and the driven wheel. Multiple idlers are provided below the return section of the conveyor mesh belt. A first idler is provided near the drive roller in the return section, and a last idler is provided near the driven roller. The idlers from the first idler to the last idler are not equidistant, and the closer to the last idler, the greater the distance between adjacent idlers.

[0010] Furthermore, the sagging force generated by the conveyor belt between the second idler and the first idler is defined as F1, the sagging force generated by the conveyor belt between the third idler and the second idler is defined as F2, the sagging force generated by the conveyor belt between the fourth idler and the third idler is defined as F3, and so on, with the sagging force generated by the conveyor belt between the nth idler and the (n-1)th idler defined as F... n-1 The sagging force generated by the conveyor belt between the (n+1)th idler and the nth idler is defined as F. n ;

[0011] Let R1 be the resistance exerted by the first idler on the conveyor belt, R2 be the resistance exerted by the second idler on the conveyor belt, and so on, until the resistance exerted by the nth idler on the conveyor belt is defined as R... n Then: F n =F n-1 +R n This makes the sag height of the return section of the mesh chain between each idler roller more uniform.

[0012] Compared with existing technologies, the present invention achieves the following beneficial effects: 1. For the return section, the driven wheel is the traction wheel, and the conveyor belt encounters certain resistance as it passes over the idlers. The distance between the last idler and the subsequent idlers is the longest, and this section of the conveyor belt reaches the driven wheel after passing through one idler, resulting in the greatest traction force exerted by the driven wheel on the longest section of the conveyor belt; the second longest section of the conveyor belt then reaches the driven wheel after passing through two idlers, resulting in the next greatest traction force exerted by the driven wheel on the second longest section of the conveyor belt; thus, the conveyor belt between the second and first idlers is the shortest, passing through the most idlers to reach the driven wheel, resulting in the least traction force exerted by the driven wheel on the shortest section of the conveyor belt. The closer the conveyor belt is to the driven wheel (i.e., the traction wheel), the longer the conveyor belt sags, and the greater the traction force it receives; the farther the conveyor belt is from the traction wheel, the shorter the sag, and the smaller the traction force it receives.

[0013] 2. The downward force generated by the mesh belt between the second idler and the first idler causes the mesh chain below the drive wheel to quickly pass over the first idler. Similarly, the downward force generated by the mesh belt between the third idler and the second idler causes the mesh belt between the second idler and the first idler to quickly pass over the second idler, and so on. This device gradually increases the spacing between the idlers to make the sag of each section of the mesh belt more uniform, thus avoiding the mesh belt from dragging on the ground for a long time on the return section. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the working state of the long-distance mesh belt conveyor of the present invention;

[0016] Figure 2 This is a schematic diagram of the long-distance mesh belt conveyor of the present invention in a stopped state;

[0017] In the diagram: 1. Drive roller; 2. First idler roller; 3. Intermediate idler roller; 4. Last idler roller; 5. Conveyor belt; 6. Driven roller. Detailed Implementation

[0018] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0020] 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 limit the scope of the invention.

[0021] like Figure 1 As shown, the long-distance mesh belt conveyor of the present invention includes a drive roller 1 and a driven roller 6. A drive wheel is installed on the drive roller 1, and a driven wheel is installed on the driven roller 6. A conveyor mesh belt 5 is wrapped between the drive wheel and the driven wheel. Multiple idlers are provided below the return section of the conveyor mesh belt 5. A first idler 2 is provided near the drive roller 1 in the return section, and a last idler 4 is provided near the driven roller 6. Multiple intermediate idlers 3 are provided between the first idler 2 and the last idler 4. The idlers are not equidistant, and the closer to the last idler 4, the larger the distance between adjacent idlers.

[0022] The longest distance is between the last idler roller 4 and the second-to-last idler roller. This section of the conveyor belt reaches the driven wheel after passing through one idler roller, and the driven wheel exerts the greatest traction force on the longest section of the conveyor belt. The second longest section of the conveyor belt then reaches the driven wheel after passing through two idler rollers, and the driven wheel exerts the next greatest traction force on the second longest section of the conveyor belt. Thus, the shortest section of the conveyor belt is between the second idler roller and the first idler roller 2, passing through the most idler rollers to reach the driven wheel, and the driven wheel exerts the least traction force on the shortest section of the conveyor belt.

[0023] The closer the belt is to the driven wheel (i.e., the traction wheel), the longer the belt sags and the greater the traction force it receives from the driven wheel; the farther the belt is from the traction wheel, the shorter the belt sags and the smaller the traction force it receives. By adjusting the spacing between the idlers, the sag of each section of the belt can be made more uniform, thus preventing the belt from dragging on the ground for a long time during the return trip.

[0024] The sagging force generated by the conveyor belt between the second idler and the first idler is defined as F1; the sagging force generated by the conveyor belt between the third idler and the second idler is defined as F2; ​​the sagging force generated by the conveyor belt between the fourth idler and the third idler is defined as F3, and so on. The sagging force generated by the conveyor belt between the nth idler and the (n-1)th idler is defined as F... n-1 The sagging force generated by the conveyor belt between the (n+1)th idler and the nth idler is defined as F. n .

[0025] Let R1 be the resistance exerted by the first idler on the conveyor belt, R2 be the resistance exerted by the second idler on the conveyor belt, and so on, until the resistance exerted by the nth idler on the conveyor belt is defined as R... n ;but:

[0026] The sagging force generated by the mesh belt between the third idler and the second idler is equal to the resistance of the mesh belt formed by the second idler on the mesh belt plus the sagging force generated by the mesh belt between the second idler and the first idler, expressed as: F2=F1+R2.

[0027] The sagging force generated by the mesh belt between the fourth idler and the third idler is equal to the resistance of the mesh belt formed by the third idler on the mesh belt plus the sagging force generated by the mesh belt between the third idler and the second idler, expressed as: F3=F2+R3.

[0028] Similarly, the sagging force generated by the conveyor belt between the (n+1)th idler and the nth idler is equal to the resistance of the nth idler on the conveyor belt plus the sagging force generated by the conveyor belt between the nth idler and the (n-1)th idler, expressed as: F n =F n-1 +R n .

[0029] This ensures that the sag of the chain on the return section is relatively uniform between the idlers, preventing the bottom of the chain from rubbing against the ground during operation.

[0030] like Figure 2As shown, when the long-distance mesh belt conveyor of the present invention stops, the distance between the last idler roller 4 and the second-to-last idler roller is the longest, and the mesh belt sags the most, making it most likely to come into contact with the ground. Since it is in a stopped state at this time, it will not cause excessive friction between the mesh belt and the ground. The sag of each subsequent section decreases step by step.

[0031] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A long-distance mesh belt conveyor, comprising a drive roller and a driven roller, wherein a drive wheel is mounted on the drive roller, a driven wheel is mounted on the driven roller, and a conveyor mesh belt is wrapped between the drive wheel and the driven wheel, characterized in that: The conveyor belt has multiple idlers below the return section. The first idler is located near the drive roller and the last idler is located near the driven roller. The idlers from the first idler to the last idler are not equidistant, and the closer to the last idler, the greater the distance between adjacent idlers. The sagging force generated by the conveyor belt between the second idler and the first idler is defined as F1; the sagging force generated by the conveyor belt between the third idler and the second idler is defined as F2; ​​the sagging force generated by the conveyor belt between the fourth idler and the third idler is defined as F3, and so on. The sagging force generated by the conveyor belt between the nth idler and the (n-1)th idler is defined as F... n-1 The sagging force generated by the conveyor belt between the (n+1)th idler and the nth idler is defined as F. n ; Let R1 be the resistance exerted by the first idler on the conveyor belt, R2 be the resistance exerted by the second idler on the conveyor belt, and so on, until the resistance exerted by the nth idler on the conveyor belt is defined as R... n Then: F n =F n-1 +R n This makes the sag height of the return section of the mesh chain between each idler roller more uniform.

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