Belt conveyor and conveying method

Abstract

The invention relates to the field of material conveying, in particular to a belt conveyor and a conveying method, and aims to solve the problem that in the prior art, a belt conveyor adopting a groove type conveying mode can have a material scattering phenomenon in an unloaded state when going uphill or downhill. In order to achieve the purpose, the belt conveyor comprises a belt and a plurality of carrier roller sets, each carrier roller set comprises inclined carrier rollers on the two sides and a horizontal carrier roller in the middle, the axes of the carrier rollers of each carrier roller set are in a groove shape, and limiting devices are arranged on the two sides of the carrier roller sets corresponding to the lower arc transition section of the belt on the uphill or downhill. The limiting device is configured to reversely press the belt during no-load, so that the belt is limited on the carrier roller set, and the phenomenon that the belt is pulled up is avoided. Under the condition that the technical scheme is adopted, the limiting device is configured to reversely press the belt during no-load, so that the belt is limited on the carrier roller group, the phenomenon that the belt is pulled up is avoided, and the problem of material scattering is further avoided.

Description

Technical Field

[0001] The invention relates to the field of material transportation, and specifically provides a belt conveyor and a transportation method. Background Art

[0002] Belt conveyor, also known as belt conveyor or belt conveyor, is a common material conveying equipment.

[0003] Belt conveyors use continuous belts, driven by motors under the action of rollers or drive wheels, to achieve continuous transportation of materials. Belt conveyors can be used for horizontal, inclined and vertical transportation, and are suitable for conveying powdered, granular and small block materials such as cement, grain, fertilizer, sand, coke, coal powder, ash, concrete, sawdust, etc. They are widely used in building materials, grain, fertilizer, metallurgy and other industries.

[0004] Most belt conveyors use a trough-type conveying method to achieve a larger carrying capacity. When a belt conveyor using a trough-type conveying method is unloaded when going uphill or downhill, material will be scattered. Therefore, it is urgent to develop a belt conveyor and a conveying method that can solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the belt conveyor adopting the trough type conveying method in the prior art may scatter materials when in an unloaded state when going uphill or downhill.

[0006] In a first aspect, the present invention provides a belt conveyor comprising a belt and a plurality of roller groups, each roller group comprising oblique rollers on both sides and a horizontal roller in the middle, the axis of the rollers of each roller group being groove-shaped, and limiting devices are arranged on both sides of the roller groups corresponding to the lower arc transition section of the belt when going uphill or downhill, and the limiting devices are configured to counter-press the belt when unloaded, so that the belt is restricted on the roller group to avoid the phenomenon of the belt being pulled up.

[0007] In the preferred technical solution of the above-mentioned belt conveyor, the limiting device includes a group of vertical roller assemblies, and the group of vertical roller assemblies are arranged near the center of the roller group corresponding to the lower arc transition section, and the group of vertical roller assemblies are correspondingly arranged on both sides of the roller group. The vertical rollers of the group of vertical roller assemblies are configured to apply back pressure to the belt so that the belt is restricted on the roller group when it is unloaded.

[0008] In the preferred technical solution of the above-mentioned belt conveyor, the group of vertical roller assemblies includes a first vertical roller assembly and a second vertical roller assembly, each group of vertical roller assemblies includes at least one vertical roller, the first vertical roller assembly is arranged on the inclined roller on one side of the inclined rollers on both sides, and the second vertical roller assembly is arranged on the inclined roller on the other side of the inclined rollers on both sides.

[0009] In the preferred technical solution of the above-mentioned belt conveyor, the extended lines of the axes of all the vertical rods in the first vertical roller assembly and the extended lines of the axes of all the vertical rods in the second vertical roller assembly intersect with the axis centerline of the belt corresponding to the lower arc transition section under load conditions.

[0010] In the preferred technical solution of the above-mentioned belt conveyor, the limiting device includes a plurality of groups of vertical roller assemblies, and the plurality of groups of vertical roller assemblies are arranged at intervals on the roller group corresponding to the lower arc transition section, and each group of vertical roller assemblies in the plurality of groups of vertical roller assemblies is correspondingly arranged on both sides of the roller group, and the vertical rollers of each group of vertical roller assemblies apply counter pressure to the belt, so that the belt is restricted on the roller group when it is unloaded.

[0011] In the preferred technical solution of the above-mentioned belt conveyor, the multiple groups of vertical roller assemblies are arranged at equal intervals on the roller groups corresponding to the lower arc transition section.

[0012] In the preferred technical solution of the above-mentioned belt conveyor, each of the multiple groups of vertical roller assemblies includes a first vertical roller assembly and a second vertical roller assembly, and each group of vertical roller assemblies includes at least one vertical roller, and the first vertical roller assembly is arranged at the inclined roller on one side of the inclined rollers on both sides, and the second vertical roller assembly is arranged at the inclined roller on the other side of the inclined rollers on both sides.

[0013] In the preferred technical solution of the above-mentioned belt conveyor, the extended lines of the axes of all the vertical rods in the first vertical roller assembly and the extended lines of the axes of all the vertical rods in the second vertical roller assembly intersect with the axis centerline of the belt corresponding to the lower arc transition section under load conditions.

[0014] In the preferred technical solution of the above-mentioned belt conveyor, the limiting device includes at least one group of baffle assemblies, and the at least one group of baffle assemblies is arranged in the lower arc transition section, and the at least one group of baffle assemblies is correspondingly arranged on both sides of the roller group, and the baffles of the at least one group of baffle assemblies are configured to apply back pressure to the belt so that the belt is restricted on the roller group when it is unloaded.

[0015] In a second aspect, the present invention further provides a conveying method of a belt conveyor, wherein the conveying method uses the above-mentioned belt conveyor for conveying.

[0016] In the preferred technical solution of the above-mentioned conveying method, the conveying method comprises:

[0017] When the belt of the belt conveyor passes through the lower arc transition section of an uphill or downhill slope and is in a no-load condition, the belt is back-pressed by the limiting device so that the belt is restricted on the roller group; or,

[0018] When the belt of the belt conveyor passes through the lower arc transition section of an uphill or downhill slope and is under load conditions, the limiting device does not act on the belt.

[0019] When adopting the above technical scheme, the belt conveyor and conveying method of the present invention adopt a trough-type conveying mode. The belt conveyor includes a belt, multiple roller groups and a limiting device. The limiting devices are arranged on both sides of the roller groups corresponding to the lower arc transition section of the belt on the uphill or downhill slope. The limiting device is constructed to counter-press the belt when it is unloaded, so that the belt is restricted on the roller group, thereby avoiding the phenomenon of the belt being pulled up, and further avoiding the problem of material spillage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a schematic operating condition diagram of the belt of the belt conveyor of the present invention in the transition section;

[0022] Figure 2 It is a schematic diagram of the belt state of the belt conveyor of the present invention when it is loaded or unloaded and without tension;

[0023] Figure 3 is a schematic diagram of the belt state of the belt conveyor of the present invention when it is unloaded and under tension;

[0024] Figure 4 is a schematic stereogram of the roller assembly and the limiting device of the present invention when assembled together;

[0025] Figure 5 yes Figure 4 A schematic side view of the limiting device in FIG.

[0026] Figure 6 It is a schematic stereoscopic diagram of a belt conveyor of the present invention provided with multiple sets of limiting devices;

[0027] Figure 7 It is a schematic diagram of the belt state of the belt conveyor of the present invention when it is loaded or unloaded and without tension;

[0028] Figure 8 is a schematic diagram of the belt state of the belt conveyor of the present invention when it is unloaded and under tension;

[0029] Fig. 9 yes Figure 8 A schematic side view of the limiting device in FIG.

[0030] Fig.10 It is a schematic stereoscopic diagram of the roller assembly and the limiting device of the present invention when assembled together.

[0031] The symbols in the figure mean the following:

[0032] 100 belt conveyor,

[0033] 10 belts,

[0034] 20 roller group, 21 oblique roller, 22 horizontal roller, 23 roller bracket,

[0035] 30 limit device,

[0036] 31 vertical roller assembly, 32 first vertical roller assembly, 321 vertical roller, 322 first side, 323 vertical roller bracket, 33 second vertical roller assembly, 331 second side,

[0037] 40 rollers,

[0038] A represents the belt position under no-load and tension conditions;

[0039] B represents the belt position under load or tension-free conditions.

[0040] C represents a straight line segment,

[0041] D represents the transition section of the lower arc.

[0042] E represents the upper arc transition section;

[0043] F represents the belt axis line of the lower arc transition section;

[0044] G represents the axis of the vertical roller. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0046] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Belt conveyor, also known as belt conveyor or belt conveyor, is a common material conveying equipment. Belt conveyor usually includes belt, roller group, roller (or drive wheel group) and tensioning device. Belt conveyor uses a continuous belt, driven by a motor under the action of roller or drive wheel group, and starts to move with the help of roller group to realize continuous transportation of materials. Belt conveyor can be used for horizontal, inclined and vertical transportation. Most of the existing belt conveyors adopt trough conveying method to achieve the purpose of larger carrying capacity. Belt conveyors with trough conveying method will scatter materials when they are unloaded when going uphill or downhill.

[0049] The inventor discovered that: whether the belt conveyor is going uphill or downhill, a lower arc will appear in the transition section of the belt to form a lower arc transition section. Under no-load conditions, the belt in the lower arc transition section will move in the chord direction of the lower arc due to the tension of the belt, showing the phenomenon of being pulled up from the roller group. This phenomenon usually occurs at the beginning or end of the operation and will cause material to spill. If a device or method can be invented to limit the belt from being pulled up, the occurrence of material spillage can be avoided. Based on this, the belt conveyor and conveying method of the present invention were developed.

[0050] Figure 1 It is a schematic diagram of the operating condition of the belt of the belt conveyor of the present invention in the transition section. Figure 2 It is a schematic belt state diagram of a belt conveyor according to an embodiment of the present invention when loaded or unloaded and without tension. Figure 3 It is a schematic belt state diagram of a belt conveyor according to an embodiment of the present invention when it is unloaded and under tension. Figure 4 The present invention is a schematic three-dimensional diagram of an embodiment of the roller assembly and the limiting device when assembled together. Figure 5 yes Figure 4 Schematic side view of the limiting device in. Figure 6 It is a schematic three-dimensional diagram of a belt conveyor according to an embodiment of the present invention when multiple sets of limiting devices are provided. Figure 7 It is a schematic belt state diagram of a belt conveyor according to another embodiment of the present invention when loaded or unloaded and without tension. Figure 8 It is a schematic belt state diagram of a belt conveyor according to another embodiment of the present invention when it is unloaded and has tension. Fig. 9 yes Figure 8 Schematic side view of the limiting device in. Fig.10 It is a schematic stereoscopic diagram of a roller group and a limiting device assembled together according to another embodiment of the present invention.

[0051] like Figure 1 See also Figure 2-Figure 10 , in order to solve the problem of material spillage in the belt conveyor 100 that adopts a trough-type conveying method in the prior art when it is in an unloaded state when going uphill or downhill. The present invention provides a belt conveyor 100. The belt conveyor 100 generally may include a belt 10, a plurality of roller groups 20, a roller 40 and a tensioning device (not shown in the figure). The belt 10, a plurality of roller groups 20, a roller 40 and a tensioning device are all prior art. Their structures are not described in detail in this embodiment. The belt 10 is usually made of multiple layers of wear-resistant rubber or polymer materials, and has a certain strength and flexibility to ensure the stability and efficiency of the conveying process. Figure 2 See also Figure 3-Figure 10 Each roller group 20 in the plurality of roller groups 20 includes oblique rollers 21 on both sides, a horizontal roller 22 in the middle and a roller support 23. The axis of the rollers in each roller group 20 is groove-shaped. The groove angle of the oblique rollers 21 is generally 30 degrees, and can also be 35 degrees or 45 degrees, or a larger groove angle, as long as it can meet the conveying requirements. Figure 1 As shown, taking the belt conveyor 100 going uphill as an example, the belt 10 is divided from bottom to top into a straight line segment C, a lower arc transition segment D, a straight line segment C, an upper arc transition segment E and a straight line segment C. The belt 10 is provided with a limit device 30 on both sides of the roller group 20 corresponding to the lower arc transition segment D of the uphill or downhill direction (see Figure 3 ), the limiting device 30 is configured to counter-press the belt 10 when it is unloaded, so that the belt 10 is restricted on the roller set 20 to avoid the phenomenon that the belt 10 is pulled up.

[0052] like Figure 2 and Figure 7 As shown, when the belt 10 is operating normally, that is, with load or without load and tension, the limit device 30 does not work. Figure 1 The state of the belt 10 is shown as B, where B represents the position of the belt 10 under load or tension-free conditions. Figure 1 See also Figure 3 and Figure 8 When the belt 10 is unloaded and pulled up due to tension, the belt 10 will first flatten. Figure 1 As shown in A, A represents the position of the belt 10 in the no-load and tension working condition. Figure 3 and Figure 8 As shown, due to the existence of the limiting devices 30 on both sides of the roller group 20, the belt 10 cannot be flattened, that is, the belt 10 cannot be pulled up, so that the belt 10 cannot leave the roller group 20 when it is unloaded, thereby realizing the constraint of the limiting device 30 on the belt 10 and realizing the downward pressing function of the limiting device 30 on the belt 10.

[0053] In the case of adopting the above technical solution, see Figure 3 and Figure 8 The belt conveyor 100 of the present invention adopts a trough-type conveying method. The belt conveyor 100 includes a belt 10, a plurality of roller groups 20 and a limiting device 30. The limiting devices 30 are arranged on both sides of the roller groups 20 corresponding to the lower arc transition section D of the belt 10 on the uphill or downhill slope. The limiting devices 30 are configured to counter-press the belt 10 when it is unloaded, so that the belt 10 is restricted on the roller groups 20, thereby avoiding the phenomenon that the belt 10 is pulled up, thereby avoiding the problem of material spillage.

[0054] In addition, the limiting device 30 has a simple structure and can effectively constrain the belt 10 without making large-scale changes to the existing structure, thereby reducing material spillage and improving transportation efficiency.

[0055] As a possible implementation, Figure 2 See also Figure 3-Figure 4 The limiting device 30 may include a set of vertical roller assemblies 31, and a set of vertical roller assemblies 31 is arranged at a position close to the center of the roller assembly 20 corresponding to the lower arc transition section D. Figure 1 The middle D section is close to the center, and a set of vertical roller assemblies 31 are correspondingly arranged on both sides of the roller assembly 20. The vertical rollers 321 of a set of vertical roller assemblies 31 are configured to apply counter pressure to the belt 10, so that the belt 10 is restricted on the roller assembly 20 when unloaded.

[0056] As a possible implementation, Figure 2 See also Figure 3-Figure 4, a group of vertical roller assemblies 31 includes a first vertical roller assembly 32 and a second vertical roller assembly 33. Each of the first vertical roller assembly 32 and the second vertical roller assembly 33 includes at least one vertical roller 321. In specific implementation, the first vertical roller assembly 32 and the second vertical roller assembly 33 may each include two vertical rollers 321 and a vertical roller bracket 323. Of course, in other embodiments, the first vertical roller assembly 32 and the second vertical roller assembly 33 may each include one vertical roller 321, three vertical rollers 321, four vertical rollers 321 or more than two vertical rollers 321, as long as the function of the limiting device 30 can be met. The first vertical roller assembly 32 is arranged on the inclined roller 21 on one side of the inclined rollers 21 on both sides, and the second vertical roller assembly 33 is arranged on the inclined roller 21 on the other side of the inclined rollers 21 on both sides. In specific implementation, as Figure 2 As shown, the first vertical roller assembly 32 is arranged on the oblique roller 21 on the left, and the second vertical roller assembly 33 is arranged on the oblique roller 21 on the right. Figure 2 The first vertical roller assembly 32 is arranged on the oblique roller 21 on the right side, and the second vertical roller assembly 33 is arranged on the oblique roller 21 on the left side.

[0057] As a possible implementation, Figure 6 See also Figure 1 , the extension line of the axis G of all the vertical rollers 321 in the first vertical roller group 32 (see Figure 1 ) and the extension line of the axis G of all the vertical rods 321 of the second vertical roller assembly 33 (see Figure 1 ) intersects with the axial centerline F of the belt 10 corresponding to the lower arc transition section D under load conditions. More specifically, Figure 4 See also Figure 6 The first surface 322 formed by the axes of all the vertical rollers in the first vertical roller assembly 32 passes through the axis F of the belt 10 corresponding to the lower arc transition section D under the load condition (see Figure 6 The axes of all the vertical rollers of the second vertical roller assembly 33 form a second surface 331, and the second surface 331 passes through the axis F of the belt 10 corresponding to the lower arc transition section D under the load condition (see Figure 6 ). Through the above structure, the belt 10 is completely restricted on the roller set 20 under the action of the limiting device 30.

[0058] As a possible implementation, Figure 6 As shown, the limiting device 30 may include a plurality of vertical roller assemblies 31, the number of the plurality of vertical roller assemblies 31 is more than two vertical roller assemblies 31, and may be Figure 6The three sets of vertical roller assemblies 31 shown can also be eight sets of vertical roller assemblies 31, ten sets of vertical roller assemblies 31 or one hundred sets of vertical roller assemblies 31, etc., depending on the length of the lower arc transition section D and the counter-pressure effect. Multiple sets of vertical roller assemblies 31 are arranged at intervals on the roller group 20 corresponding to the lower arc transition section D. Each set of vertical roller assemblies 31 in the multiple sets of vertical roller assemblies 31 is correspondingly arranged on both sides of the roller group 20. The vertical rollers 321 of each set of vertical roller assemblies 31 apply counter-pressure to the belt 10, so that the belt 10 is restricted on the roller group 20 when it is unloaded.

[0059] As a possible implementation, Figure 6 As shown, multiple groups of vertical roller assemblies 31 are arranged at equal intervals on the roller group 20 corresponding to the lower arc transition section D. Through the above structure, the belt 10 of the entire lower arc transition section D is evenly constrained on the roller group 20. For example, the length of the lower arc transition section D of the belt is 100 meters, and a group of vertical roller assemblies 31 can be arranged every 1 meter. Of course, in other embodiments, the intervals can also be non-equal intervals, and the length of the intervals can also be other values.

[0060] As a possible implementation, Figure 2 See also Figure 3-Figure 4 , each of the multiple groups of vertical roller assemblies 31 includes a first vertical roller assembly 32 and a second vertical roller assembly 33. Each vertical roller assembly 31 includes at least one vertical roller 321. In specific implementation, the first vertical roller assembly 32 and the second vertical roller assembly 33 may each include two vertical rollers 321 and a vertical roller bracket 323. Of course, in other embodiments, the first vertical roller assembly 32 and the second vertical roller assembly 33 may each include one vertical roller 321, three vertical rollers 321, four vertical rollers 321 or more than two vertical rollers 321, as long as the function of the limiting device 30 can be met. The first vertical roller assembly 32 is arranged at the inclined roller 21 on one side of the inclined rollers 21 on both sides, and the second vertical roller assembly 33 is arranged at the inclined roller 21 on the other side of the inclined rollers 21 on both sides. In specific implementation, as Figure 2 As shown, the first vertical roller assembly 32 is arranged on the oblique roller 21 on the left, and the second vertical roller assembly 33 is arranged on the oblique roller 21 on the right. Figure 2 The first vertical roller assembly 32 is arranged on the oblique roller 21 on the right side, and the second vertical roller assembly 33 is arranged on the oblique roller 21 on the left side.

[0061] As a possible implementation, Figure 6 See also Figure 1 , the extension line of the axis G of all the vertical rollers 321 in the first vertical roller group 32 (see Figure 1) intersects with the axis F of the belt 10 corresponding to the lower arc transition section D under load conditions. The extension line of the axis G of all the vertical rods 321 of the second vertical roller assembly 33 (see Figure 1 ) intersects with the axial centerline F of the belt 10 corresponding to the lower arc transition section D under load conditions. More specifically, as Figure 4 See also Figure 6 The first surface 322 formed by the axes of all the vertical rollers in the first vertical roller assembly 32 passes through the axis F of the belt 10 corresponding to the lower arc transition section D under the load condition (see Figure 6 The axes of all the vertical rollers of the second vertical roller assembly 33 form a second surface 331, and the second surface 331 passes through the axis F of the belt 10 corresponding to the lower arc transition section D under the load condition (see Figure 6 ). Through the above structure, the belt 10 is completely restricted on the roller set 20 under the action of the limiting device 30.

[0062] When implementing it, Figure 2-6 As shown, the vertical roller support 323 in this embodiment is a single arm. Figure 7-10 As shown, this embodiment is Figure 2-6 The difference between the embodiments is that: Figure 7-10 The vertical roller support 323 of the illustrated embodiment is a double-arm. Of course, in other embodiments, the vertical roller support 323 can also be in other forms, as long as it can meet the requirements of stably supporting the vertical roller.

[0063] As a possible implementation, see Figure 2 The limiting device 30 includes at least one set of baffle assemblies (not shown in the figure), at least one set of baffle assemblies is arranged on the lower arc transition section D, and at least one set of baffle assemblies is correspondingly arranged on both sides of the roller assembly 20, and the baffles of at least one set of baffle assemblies are configured to apply a counter pressure to the belt 10, so that the belt 10 is restricted on the roller assembly 20 when it is unloaded. In specific implementation, the baffle assembly includes a baffle and a baffle bracket, see Figure 2 , the vertical roller 321 can be replaced with a baffle. During specific implementation, the baffle can also be equipped with self-lubricating material to avoid wear on the belt 10 edge.

[0064] See also Figure 1-Figure 10 The present invention also provides a conveying method of a belt conveyor, and the conveying method adopts the above-mentioned belt conveyor 100 for conveying.

[0065] As a possible implementation, the conveying method includes: when the belt 10 of the belt conveyor 100 passes through the lower arc transition section D of an uphill or downhill slope and is in an unloaded condition, the belt 10 is back-pressed by the limiting device 30 so that the belt 10 is restricted on the roller group 20; or,

[0066] When the belt 10 of the belt conveyor 100 passes through the lower arc transition section D of an uphill or downhill slope and is under load conditions, the limiting device 30 does not act on the belt 10 .

[0067] When adopting the above technical solution, the conveying method of the belt conveyor 100 of the present invention adopts a trough-type conveying method. The belt conveyor 100 includes a belt 10, a plurality of roller groups 20 and a limiting device 30. The limiting devices 30 are arranged on both sides of the roller groups 20 corresponding to the lower arc transition section D of the belt 10 on the uphill or downhill slope. The limiting device 30 is constructed to counter-press the belt 10 when it is unloaded, so that the belt 10 is restricted on the roller groups 20, thereby avoiding the phenomenon of the belt 10 being pulled up, thereby avoiding the problem of material spillage.

[0068] The conveying method of the present invention is simple and effective, can reduce material spillage and improve transportation efficiency.

[0069] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A belt conveyor, characterized in that: The invention comprises a belt (10) and a plurality of roller groups (20), each roller group (20) comprising oblique rollers (21) on both sides and a horizontal roller (22) in the middle, the axis of the rollers of each roller group (20) being groove-shaped, and limiting devices (30) are arranged on both sides of the roller group (20) corresponding to the lower arc transition section of the belt (10) on an uphill or downhill slope, and the limiting devices (30) are configured to counter-press the belt (10) when unloaded, so that the belt (10) is restricted on the roller group (20) to avoid the phenomenon that the belt (10) is pulled up.

2. The belt conveyor according to claim 1, characterized in that: The limiting device (30) comprises a group of vertical roller assemblies (31), the group of vertical roller assemblies (31) being arranged at a position close to the center of the roller group (20) corresponding to the lower arc transition section, and the group of vertical roller assemblies (31) being arranged correspondingly on both sides of the roller group (20), and the vertical rollers (321) of the group of vertical roller assemblies (31) being configured to apply a counter pressure to the belt (10), so that the belt (10) is restricted on the roller group (20) when unloaded.

3. The belt conveyor according to claim 2, characterized in that: The set of vertical roller assemblies (31) comprises a first vertical roller assembly (32) and a second vertical roller assembly (33), each vertical roller assembly (31) comprises at least one vertical roller (321), the first vertical roller assembly (32) being arranged on the inclined roller (21) on one side of the inclined rollers (21) on both sides, and the second vertical roller assembly (33) being arranged on the inclined roller (21) on the other side of the inclined rollers (21) on both sides.

4. The belt conveyor according to claim 3, characterized in that: The extended lines of the axes of all the vertical rods in the first vertical roller assembly (32) and the extended lines of the axes of all the vertical rods in the second vertical roller assembly (33) intersect with the axis center line of the belt (10) corresponding to the lower arc transition section under load conditions.

5. The belt conveyor according to claim 1, characterized in that: The limiting device (30) comprises a plurality of vertical roller assemblies (31), the plurality of vertical roller assemblies (31) being arranged at intervals on the roller assembly (20) corresponding to the lower arc transition section, each of the plurality of vertical roller assemblies (31) being arranged on both sides of the roller assembly (20), and the vertical rollers (321) of each vertical roller assembly (31) applying a counter pressure to the belt (10), so that the belt (10) is restricted on the roller assembly (20) when unloaded.

6. The belt conveyor according to claim 5, characterized in that: The plurality of vertical roller assemblies (31) are arranged at equal intervals on the roller assembly (20) corresponding to the lower arc transition section.

7. The belt conveyor according to claim 5, characterized in that: Each of the plurality of vertical roller assemblies (31) comprises a first vertical roller assembly (32) and a second vertical roller assembly (33), and each vertical roller assembly (31) comprises at least one vertical roller (321). The first vertical roller assembly (32) is arranged at the inclined roller (21) on one side of the inclined rollers (21) on both sides, and the second vertical roller assembly (33) is arranged at the inclined roller (21) on the other side of the inclined rollers (21) on both sides.

8. The belt conveyor according to claim 7, characterized in that: The extended lines of the axes of all the vertical rods in the first vertical roller assembly (32) and the extended lines of the axes of all the vertical rods in the second vertical roller assembly (33) intersect with the axis center line of the belt (10) corresponding to the lower arc transition section under load conditions.

9. The belt conveyor according to claim 1, characterized in that: The limiting device (30) comprises at least one set of baffle assemblies, wherein the at least one set of baffle assemblies is arranged in the lower arc transition section, and the at least one set of baffle assemblies is correspondingly arranged on both sides of the roller group (20), and the baffles of the at least one set of baffle assemblies are configured to apply a counter pressure to the belt (10), so that the belt (10) is restricted on the roller group (20) when unloaded.

10. A conveying method of a belt conveyor, characterized in that: The conveying method adopts the belt conveyor (100) described in any one of claims 1 to 9 for conveying.

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