A stepped tension balancing device for belt conveyors

Abstract

This invention discloses a stepped tension balancing device for belt conveyors, comprising a circular base mounted on the side frame of the conveyor, a rotating cylinder rotatably disposed between two circular bases, and symmetrically arranged outer covers with outer walls that abut against the belt surface on the rotating cylinder. A driving arc plate movably disposed on the circular base to push the two outer covers away from each other. The stepped tension balancing device for belt conveyors provided by this invention uses a rotating driving block to cause its first and second arc surfaces to sequentially abut against two circumferentially arranged driving arc plates, opening them up. The two ends of the driving arc plates sequentially push the two outer covers away from each other, thereby compressing and tensioning the belt, achieving the purpose of straightening the belt. The second arc surface is used to accommodate when the belt exceeds its normal deformation range, with the aim of providing the two outer covers with a longer tensioning stroke to meet the tension requirements after the belt has fully deformed.

Description

Technical Field

[0001] This invention relates to the field of conveyor tension adjustment technology, and more specifically to a stepped tension balancing device for belt conveyors. Background Technology

[0002] Belt conveyors, also known as belt conveyors, are commonly used in industrial and agricultural conveying mechanisms. They have drive rollers and multiple driven rollers on the inner side of the belt, which are driven to move and transport under the action of tension friction.

[0003] According to the publication (announcement) number: CN103896009A, the publication (announcement) date: 2014-07-02, a belt conveyor that integrates inclined and horizontal sections is disclosed.

[0004] In the prior art, including the aforementioned patents, belt conveyors with climbing capabilities and long strokes are typically equipped with multiple tensioning mechanisms. For example, a tension bearing housing is installed at the driven pulley at the end of the conveyor, and a center distance tensioning base is installed between the driven pulley and the driving pulley. These two mechanisms can only adjust the belt tension slightly and adjust it for larger deformations, respectively. For medium-stroke conveyors, tension adjustment is usually only performed on the driven pulley. Therefore, the adjustable stroke of the bearing housing often cannot meet the degree of belt deformation, and new belts need to be replaced in a timely manner. This can easily lead to belt waste, increase workshop operating costs, and reduce production and conveying efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a stepped tension balancing device for belt conveyors, which aims to solve the problems mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A stepped tension balancing device for a belt conveyor includes a conveyor side frame on which a belt is provided, and a circular seat installed on the conveyor side frame. A rotating drum is rotatably arranged between the two circular seats. An outer cover with an outer side wall that abuts against the surface of the belt is movably arranged on the rotating drum.

[0008] The circular seat is movably provided with a drive arc plate for pushing two outer covers away from each other, and a first shaft block and a second shaft block are provided on the side of the drive arc plate;

[0009] A driving block is also rotatably mounted on the circular base. The driving block has a first arc surface and a second arc surface, wherein:

[0010] With the first arc surface slidingly engaged with the inner wall of the driving arc plate, the driving arc plate rotates around the first shaft block as the center;

[0011] With the second arc surface slidingly engaging with the inner wall of the driving arc plate, the driving arc plate rotates around the second shaft block as the center.

[0012] Preferably, a rotating shaft located inside the rotating cylinder is rotatably mounted on the circular seat, and the driving block is symmetrically fixed to the end of the rotating shaft;

[0013] A connecting rod that is movably connected to the slide plate is fixedly sleeved on the rotating shaft, and a slide plate that slides against the inner surface of the belt is hinged to the end of the connecting rod.

[0014] Preferably, telescopic rods arranged at equal intervals are fixedly installed between the rotating cylinder and the outer cover.

[0015] Preferably, the inner side of the outer cover is provided with an arc sleeve that slides against the outer wall of the driving arc plate.

[0016] Preferably, the circular seat is provided with an arc seat located between adjacent driving arc plates, and the outer wall of the arc seat slides in fit with the arc sleeve.

[0017] Preferably, the arc seat is provided with a cross block, and a contact plate is rotatably provided on the cross block. The contact plate has a first shaft hole that is embedded and cooperates with the first shaft block, and a second shaft hole that is embedded and cooperates with the second shaft block.

[0018] Preferably, a boss located between the first arc surface and the second arc surface is fixedly installed on the driving block, and a contact plate that slides with the end face of the boss is installed on the contact plate.

[0019] Preferably, a protective strip is fixedly installed on the contact plate on the outer side of the belt edge.

[0020] Preferably, the guard strip is provided with a long guard edge and a short guard edge, and adjacent long guard edges and short guard edges are respectively located on the two end faces of the belt.

[0021] Preferably, the deflected guard strip ensures that both the long and short guard edges are in contact with the belt surface.

[0022] In the above technical solution, the stepped tension balancing device for belt conveyors provided by the present invention has the following beneficial effects: When the belt becomes slack, the rotation of the drive block causes the two first arc surfaces to abut against two circumferentially arranged drive arc plates, causing the drive arc plates to rotate and open around the first shaft block. The ends of the drive arc plates at the second shaft block position push the two outer covers away from each other, thereby squeezing and tensioning the belt with the two outer covers, achieving the purpose of straightening the belt. At this time, the straightened belt also stops rotating along with the drive block, ensuring the stability of the tensioning stroke of the outer covers on the belt. Simultaneously, during the belt tensioning process, the belt in operation can use rolling friction to drive the outer covers to rotate. It works in conjunction with a rotating drum to provide a rotating axis, reducing interference from external forces such as sliding friction on the belt and minimizing belt deformation damage. When the belt exceeds its normal deformation range, after the first arc surface reaches its maximum rotation position, the continuing rotating drive block causes the second arc surface with a larger angle to engage with the drive arc plate. At this time, the drive arc plate rotates around the second shaft block and uses the end of the first shaft block to push the two outer covers away again, allowing the two outer covers to have more tension stroke to meet the tension requirements after the belt is fully deformed. This results in a longer service life for the belt on the conveyor, while also ensuring stable operation of the conveyor and reducing interference with workshop operating costs and production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the belt and tensioning mechanism assembly provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the tensioning mechanism and its connecting rod assembly provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the tensioning mechanism provided in an embodiment of the present invention;

[0027] Figure 4 A front view of the tensioning mechanism provided in an embodiment of the present invention;

[0028] Figure 5 An exploded view of the tensioning mechanism provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the driving arc plate structure provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the tensioning mechanism provided in an embodiment of the present invention, showing a front cross-section and a rear view.

[0031] Figure 8 This is a schematic diagram of the assembly of the belt edge and the movable guard strip provided in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the assembly of the driving arc plate, the contact plate, and the guard strip on it, provided in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Belt; 11. Conveyor side frame; 2. Round seat; 21. Arc seat; 22. Cross block; 3. Rotary shaft; 31. Drive block; 32. First arc surface; 33. Second arc surface; 34. convex seat; 4. Rotary drum; 41. Telescopic rod; 42. Outer cover; 43. Bracket; 431. Arc sleeve; 5. Drive arc plate; 51. First shaft block; 52. Second shaft block; 53. First shaft hole; 54. Second shaft hole; 6. Contact plate; 61. Shaft; 62. Contact piece; 63. Guard strip; 631. Long guard edge; 632. Short guard edge; 7. Connecting rod; 71. Slide plate; 72. Sliding component. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1-9 As shown, a stepped tension balancing device for a belt conveyor includes a conveyor side frame 11 on which a belt 1 is provided, and a circular seat 2 installed on the conveyor side frame 11. A rotating drum 4 is rotatably arranged between the two circular seats 2. An outer cover 42 with an outer side wall that abuts against the surface of the belt 1 and is symmetrically arranged is movably arranged on the rotating drum 4.

[0037] A drive arc plate 5 for pushing two outer covers 42 away from each other is movably arranged on the round seat 2. A first shaft block 51 and a second shaft block 52 are arranged on the side of the drive arc plate 5.

[0038] A drive block 31 is also rotatably mounted on the circular base 2. The drive block 31 has a first arc surface 32 and a second arc surface 33, wherein:

[0039] With the first arc surface 32 slidingly engaged with the inner wall of the driving arc plate 5, the driving arc plate 5 rotates around the first shaft block 51 as the center.

[0040] With the second arc surface 33 slidingly engaging with the inner wall of the driving arc plate 5, the driving arc plate 5 rotates around the second shaft block 52 as the center.

[0041] Specifically, the conveyor side frame 11 is a support arm plate on the side of the conveyor body, so that the rollers used to drive the belt 1 and the tensioning mechanism have stable working conditions.

[0042] Furthermore, a torsion spring is provided between the drive block 31 and the round seat 2, and the torsion spring is pre-loaded so that when the belt 1 becomes slack, the torsion spring will recover its deformation and be used to rotate the drive block 31 to reset, thereby providing rotational power.

[0043] Furthermore, the outer cover 42 has a range of movement radially away from the axis, and the tension of the belt 1 is achieved by utilizing the gap created by the two outer covers 42, resulting in a more significant tensioning effect.

[0044] Furthermore, the first arc surface 32 and the second arc surface 33 on the annular sidewall of the drive block 31 are connected, and the inclination angle of the arc surface 32 gradually increases towards the position of the second arc surface 33. That is, the distance between the two points of the relative positions of the two first arc surfaces 32 gradually increases, while the inclination angle of the second arc surface 33 is greater than that of the first arc surface 32. That is, although the two are connected, the inclination angle shows a gradient increase. At the same time, the first arc surface 32 and the second arc surface 33 are grouped together, and there are two groups arranged in a circle on the annular sidewall so as to push against the two drive arc plates 5, so that the drive arc plates 5 form a transfer plate that pushes open.

[0045] Furthermore, a slider is fixedly installed on the drive arc plate 5, and an arc-shaped groove for the slider to slide is opened on the end face of the round seat 2. An arc-shaped spring and a limiting component are fixedly installed between the slider and the groove. The purpose is to provide sliding conditions for the opening action of the drive arc plate 5. The positions of the two arc-shaped grooves are not symmetrical, but staggered. The positions must correspond to the first shaft block 51 and the second shaft block 52 after the position is switched. At the same time, the setting method of the spring and the limiting component is the existing technology, which can provide stable sliding and prevent disengagement. It will not be described in detail here.

[0046] Furthermore, the first shaft block 51 and the second shaft block 52 are located at the two end positions on one side of the driving arc plate 5, such as... Figure 6 As shown, the first shaft block 51 is the axis of rotation of the drive arc plate 5 by default, and after the position of the drive arc plate 5 is switched, the second shaft block 52 becomes the axis of rotation of the drive arc plate 5.

[0047] When belt 1 becomes slack, the drive block 31 rotates, causing the two first arc surfaces 32 to abut against the two circumferentially arranged drive arc plates 5. This causes the drive arc plates 5 to rotate and open around the first shaft block 51. The ends of the drive arc plates 5 at the positions of the second shaft blocks 52 push the two outer covers 42 away from each other, thus squeezing and tensioning belt 1, achieving the purpose of straightening belt 1. At this time, the straightened belt 1 also stops rotating along with the drive block 31, ensuring the stability of the tensioning stroke of the outer covers 42 on belt 1. Simultaneously, during the tensioning process of belt 1, the belt 1 in operation can use rolling friction to drive the outer covers 42 to rotate, and the rotating drum 4 provides the axis of rotation, used to reduce... The reduced external forces, such as sliding friction, cause less interference to belt 1, thus reducing the problem of belt 1 deformation damage. When belt 1 exceeds the normal deformation range, after the first arc surface 32 reaches its maximum rotation position, the continuously rotating drive block 31 causes the second arc surface 33 with a larger inclination angle to engage with the drive arc plate 5. At this time, the drive arc plate 5 rotates around the second shaft block 52 as the center, and uses the end of the first shaft block 51 to push the two outer covers 42 away again, so that the two outer covers 42 have more tension stroke to meet the tension of belt 1 after complete deformation, so that belt 1 on the conveyor has a longer service life, while also ensuring the stable operation of the conveyor and reducing interference with workshop operating costs and production conveying efficiency.

[0048] As a further embodiment of the present invention, a rotating shaft 3 located inside the rotating cylinder 4 is rotatably disposed on the round seat 2, and the driving block 31 is symmetrically fixed to the end of the rotating shaft 3;

[0049] A connecting rod 7, which is movably connected to the slide plate 71, is fixedly sleeved on the rotating shaft 3. The end of the connecting rod 7 is hinged to the slide plate 71, which slides against the inner surface of the belt 1.

[0050] Specifically, the drive block 31 is located between the round seat 2 and the conveyor side frame 11, and the two drive blocks 31 move synchronously via the rotating shaft 3 so that the drive arc plates 5 on the two round seats 2 keep synchronously pushing against the outer cover 42, thereby improving the stability of the outer cover 42 during the tensioning process of the belt 1.

[0051] Furthermore, the connecting rod 7 is inclined in the default state and is installed at the end of the rotating shaft 3. The two connecting rods 7 are arranged opposite each other. From the perspective of the connecting rod 7 as the horizontal plane, the two connecting rods 7 and the rotating shaft 3 between them form a "Z" shape, so that the two slide plates 71 slide against the inner end face of the belt 1 and can accept the frictional force of the belt 1 running in opposite directions. The frictional force is then used to limit the slide plates 71.

[0052] Furthermore, a slider 72 is slidably provided at the end of the connecting rod 7, and the slider 72 also rotates on the connecting rod 7. The slider 72 is specifically a rectangular block. Meanwhile, a groove is provided on the side of the slide plate 71 for the slider 72 to slide, and a limit is set in the groove to prevent the slider 72 from slipping off. At the same time, a slider is also fixedly installed on the side of the slide plate 71, and a groove is provided on the conveyor side frame 11 for the slider to slide, the purpose of which is to provide support for the lateral movement of the slide plate 71.

[0053] When belt 1 becomes slack, the belt 1 that was originally attached to the end face of slide plate 71 can no longer provide opposing friction, causing slide plate 71 to move laterally away from the tensioning mechanism. This is accompanied by the torsion spring on drive block 31 restoring its deformation, thereby realizing the reset by using the pre-stored torsion spring to make drive block 31 rotate and push, without the need for external drive or drive on the conveyor. The force transmitted by slide plate 71 used for slack detection is divided by link 7. Since the best way to identify slack is the force perpendicular to belt 1, the detection force perpendicular to belt 1 will push against belt 1 on its own. Under long-term use, it will squeeze belt 1 and cause deformation. Link 7 diagonally separates the force used for identification, which can effectively reduce the squeezing damage to belt 1 caused by the force stored in the torsion spring. At the same time, slide plate 71, which has lost its friction limit, can also react quickly to make the outer cover 42 tensioned.

[0054] As another embodiment of the present invention, telescopic rods 41 arranged at equal intervals are fixedly installed between the rotating cylinder 4 and the outer cover 42.

[0055] Specifically, a tension spring is provided in the telescopic rod 41, and the way the tension spring is set is existing technology, which will not be described in detail here.

[0056] By setting up telescopic rods 41 with tension springs, on the one hand, the telescopic rods 41 arranged at equal intervals can connect and fix the rotating drum 4 and the two outer covers 42, increasing the stability during the tensioning of the belt 1. On the other hand, the tension springs in the telescopic rods 41 will not cause compression damage to the belt 1, thus protecting the belt 1.

[0057] As another embodiment of the present invention, an arc sleeve 431 is provided on the inner side of the outer cover 42 to slide against the outer wall of the driving arc plate 5.

[0058] Specifically, a bracket 43 is fixedly installed on the inner wall of the outer cover 42, and the arc sleeve 431 is fixedly installed on the bracket 43. The two arc sleeves 431 on the round seat 2 are symmetrically arranged so that the circumferentially arranged drive arc plate 5 pushes against the arc sleeve 431 more smoothly.

[0059] Furthermore, the inclined surface of the driving arc plate 5 during the opening process is in the same direction as the rotation of the arc sleeve 431, so that the arc sleeve 431 is lifted by the driving arc plate 5 during the rotation process, thus avoiding the problem of the outer cover 42 getting stuck during rotation.

[0060] Furthermore, multiple balls are equidistantly arranged on the inner wall of the arc sleeve 431 to reduce the friction between the arc sleeve 431 and the drive arc plate 5.

[0061] As the arc sleeve 431 rotates with the outer cover 42, it is pushed away by the opening drive arc plate 5, causing the two arc sleeves 431 to move away from each other. This drives the two outer covers 42 to adjust the tension of the belt 1. Accompanied by the deformation of the tension spring on the telescopic rod 41, the ball bearings in the arc sleeve 431 can also effectively reduce the friction during the rotation of the outer cover 42, reduce the sliding friction between the outer cover 42 and the belt 1 during operation, and improve the operating efficiency of the belt 1.

[0062] As a further embodiment of the present invention, an arc seat 21 is provided on the round seat 2 between adjacent driving arc plates 5, and the outer wall of the arc seat 21 slides in cooperation with the arc sleeve 431.

[0063] Specifically, the arc seat 21 is symmetrically arranged on the end face of the round seat 2, which is the position where the driving block 31 moves, and the driving block 31 rotates between the two arc seats 21.

[0064] By using the arc seat 21 located between the two driving arc plates 5, the gap in the annular position of the driving arc plates 5 can be reduced, so that the fixed arc seat 21 can directly provide support for the arc sleeve 431 during rotation, making the rotation of the arc sleeve 431 more stable before it moves away, making the arc sleeve 431 pass through the arc seat 21 more smoothly, and reducing the occurrence of jamming problems.

[0065] As a further embodiment of the present invention, a cross block 22 is provided on the arc seat 21, and a contact plate 6 is rotatably provided on the cross block 22. The contact plate 6 has a first shaft hole 53 that is embedded and cooperates with the first shaft block 51, and a second shaft hole 54 that is embedded and cooperates with the second shaft block 52.

[0066] Specifically, the cross block 22 is fixed to the end of the arc seat 21, and the cross block 22 is also provided with screw holes for disassembly and assembly connection with the conveyor side frame 11. The entire tensioning mechanism is also located on the outer end face of the belt 1, so it is not easily disturbed by the belt 1 during maintenance.

[0067] Furthermore, a shaft 61 is fixedly installed on the side of the contact plate 6, and the shaft 61 is rotatably mounted on a short protrusion in the cross block 22 (e.g., Figure 4 As shown), the long protrusion of the cross block 22 is connected to the arc seat 21 so that the contact plate 6 has sufficient space to rotate around the shaft 61.

[0068] Furthermore, the first shaft hole 53 and the second shaft hole 54 are arranged diagonally so that the drive arc plate 5 can rotate and open sequentially from the first shaft hole 53 and the second shaft hole 54 after switching positions.

[0069] Furthermore, the length of the first shaft block 51 is greater than the length of the second shaft block 52, so that when the first shaft block 51 rotates around the center in the default state, the second shaft block 52 slides against the end face of the contact plate 6, ensuring the working stability of the tensioning mechanism under normal deformation.

[0070] In the default state, the first shaft block 51 rotates in the first shaft hole 53. During the process of the drive arc plate 5 being opened by the first arc surface 32, the second shaft block 52 moves in an arc-shaped trajectory until it reaches the end of the stroke at the port of the second shaft hole 54, so as to perform the position switching operation. When the contact plate 6 is deflected by the shaft 61, the shorter second shaft block 52 is inserted into the second shaft hole 54, and the first shaft block 51 is pulled out from the first shaft hole 53. When the drive arc plate 5 performs an extended opening stroke, the first shaft block 51 slides in an arc-shaped trajectory against the end face of the deflected contact plate 6, thereby completing the rotation center change operation of the drive arc plate 5 position switching operation and improving the range of tension adjustment of the belt 1 by the tensioning mechanism.

[0071] As a further embodiment of the present invention, a boss 34 located between the first arc surface 32 and the second arc surface 33 is fixedly installed on the driving block 31, and a contact plate 62 that slides with the end face of the boss 34 is installed on the contact plate 6.

[0072] Specifically, the boss 34 is mounted on the end face of the drive block 31 and is located at the connection of two arc surfaces. The end of the boss 34 is provided with an inclined cut so that the boss 34 can more easily slide against the contact piece 62, thereby increasing the smoothness of operation.

[0073] Furthermore, the contact piece 62 is positioned at the first shaft hole 53 so that the long first shaft block 51 can be pulled out of the first shaft hole 53 (e.g., Figure 9 (As shown).

[0074] The rotating drive block 31 reaches the position switching station between the first arc surface 32 and the second arc surface 33. The inclined surface on the boss 34 first abuts against the contact piece 62 and lifts the contact piece 62 so that the contact plate 6 rotates around the shaft 61 as the axis, so that the first shaft block 51 is pulled out from the first shaft hole 53, and the second shaft block 52 is inserted into the second shaft hole 54 to realize the switching work of increasing the stroke, making the operation of the outer cover 42 more convenient when the tensioning stroke is increased.

[0075] As another embodiment of the present invention, a protective strip 63 located on the outer edge of the belt 1 is fixedly installed on the contact plate 6.

[0076] Specifically, such as Figure 3 and Figure 4As shown, the guard strip 63 is located on the end face of the contact plate 6 where the shaft hole is not opened, and the length of the guard strip 63 is greater than the outer diameter of the two outer covers 42 after reaching the maximum tension stroke, so that the guard strip 63 can perform the shielding and protection work.

[0077] Furthermore, the length of the guard strip 63 is greater than the diameter of the belt 1 at the tensioning mechanism, and the two sides of the belt 1 are located between the longitudinally arranged guard strips 63.

[0078] By setting a guard strip 63 on the outside of the belt 1, the guard strip 63 can form a barrier protection on the edge of the belt 1 with its inner end face, reducing the belt 1 from running off track. At the same time, the guard strip 63 can also shield the components in the round seat 2, reducing the problem of materials or debris intrusion.

[0079] As a further embodiment of the present invention, the guard strip 63 is provided with a long guard edge 631 and a short guard edge 632, and the adjacent long guard edge 631 and short guard edge 632 are respectively located on the two end faces of the belt 1.

[0080] Specifically, such as Figure 3 and Figure 7 As shown, the long guard edge 631 and the short guard edge 632 have the same length, but the length depends on the length of the end of the guard strip 63, that is, the extension length of the guard edge. The purpose is to form a gap between the inner wall of the long guard edge 631 and the outer wall of the short guard edge 632 for the conveyor belt 1.

[0081] When the belt 1 is arranged, its outer surface is close to the outer wall of the short guard 632 and its inner surface is close to the inner wall of the long guard 631. This allows the two guards to limit the belt 1 and also enhances the anti-deviation effect of the guard strip 63 on the edge of the belt 1. Furthermore, with the surface of the belt 1 as the horizontal viewpoint, the long guard 631 and the short guard 632, which are positioned one above the other, can also indirectly limit the slack belt 1, further reducing the deviation of the belt 1 when it is slack.

[0082] As another embodiment of the present invention, the deflected guard strip 63 makes the ends of both the long guard strip 631 and the short guard strip 632 fit against the surface of the belt 1.

[0083] Specifically, the short guard edge 632 is positioned on one side of the contact piece 62 so that the short guard edge 632 can actively move closer to and adhere to the outer surface of the belt 1 as the guard strip 63 deflects.

[0084] The deflection of the contact plate 6 causes the guard strip 63 to deflect, and the raised end of the short guard strip 632 actively abuts against the outer surface of the belt 1, while the sunken end of the long guard strip 631 actively abuts against the inner surface of the belt 1 (e.g., ...). Figure 8As shown, this achieves the clamping function of the belt 1 edge, which is to assist in straightening the belt 1 during the stroke switching process and avoid the problem of the belt 1 loosening again during the stroke switching. At the same time, the inclined guard strip 63 can also make its end face actively move towards the edge of the belt 1, and work with the guard strips 63 set longitudinally on the two round seats 2 to synchronously fit the edge of the belt 1, so as to realize the positioning and correction of the belt 1 during the stroke switching process, effectively reduce the problem of loosening and deviation of the belt 1 during the stroke switching, and ensure the stability of the belt 1 during the tensioning process.

[0085] Working principle: When belt 1 becomes slack, the belt 1, which was originally attached to the end face of slide plate 71, can no longer provide opposing friction. This causes slide plate 71 to move laterally away from the tensioning mechanism. Simultaneously, the torsion spring on drive block 31 returns to its original deformation, achieving reset using the pre-stored torsion spring. This allows drive block 31 to rotate and push against the mechanism. As drive block 31 rotates, the two first arc surfaces 32 abut against the two circumferentially arranged drive arc plates 5. The drive arc plates 5 rotate and open around the first shaft block 51. The ends of the second shaft blocks 52 on the drive arc plates 5 push the two outer covers 42 away from each other, thus squeezing and tensioning belt 1, achieving the purpose of straightening belt 1. At this time, the straightened belt 1 also moves laterally away from the tensioning mechanism. When the moving block 31 stops rotating, the two outer covers 42, during the tensioning of the belt 1, can use rolling friction to drive the outer covers 42 to rotate, and cooperate with the rotating drum 4 to provide the axis of rotation, so as to reduce the interference of external forces such as sliding friction on the belt 1. When the belt 1 exceeds the normal deformation and use level, after the first arc surface 32 reaches the maximum rotation position, the continuing rotating drive block 31 causes the second arc surface 33 with a larger inclination angle to push against the drive arc plate 5. At this time, the drive arc plate 5 rotates around the second shaft block 52 as the center, and uses the end of the first shaft block 51 to push the two outer covers 42 away again, so that the two outer covers 42 have more tension stroke to meet the tension of the belt 1 after complete deformation.

[0086] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A stepped tension balancing device for a belt conveyor, comprising a conveyor side frame (11) on which a belt (1) is mounted, characterized in that, It also includes a round seat (2) installed on the side frame (11) of the conveyor, and a rotating drum (4) is rotatably arranged between the two round seats (2). The rotating drum (4) is movably provided with an outer cover (42) whose outer wall abuts against the surface of the belt (1) and is arranged symmetrically. The circular seat (2) is movably provided with a driving arc plate (5) for pushing the two outer covers (42) away from each other. The driving arc plate (5) is provided with a first shaft block (51) and a second shaft block (52) on its side. A driving block (31) is rotatably mounted on the circular base (2). The driving block (31) has a first arc surface (32) and a second arc surface (33), wherein: With the first arc surface (32) slidingly engaging with the inner wall of the driving arc plate (5), the driving arc plate (5) rotates around the first shaft block (51) as the center. With the second arc surface (33) slidingly engaging with the inner wall of the driving arc plate (5), the driving arc plate (5) rotates around the second shaft block (52) as the center.

2. The stepped tension balancing device for a belt conveyor according to claim 1, characterized in that, The circular seat (2) is also rotatably provided with a rotating shaft (3) located inside the rotating cylinder (4), and the driving block (31) is symmetrically fixed at the end of the rotating shaft (3); A connecting rod (7) that is movably connected to the slide plate (71) is fixedly sleeved on the rotating shaft (3), and a slide plate (71) that slides against the inner surface of the belt (1) is hinged at the end of the connecting rod (7).

3. The stepped tension balancing device for a belt conveyor according to claim 2, characterized in that, Telescopic rods (41) are fixedly installed at equal intervals between the rotating drum (4) and the outer cover (42).

4. A stepped tension balancing device for a belt conveyor according to claim 3, characterized in that, The inner side of the outer cover (42) is provided with an arc sleeve (431) that slides against the outer wall of the drive arc plate (5).

5. A stepped tension balancing device for a belt conveyor according to claim 4, characterized in that, The circular seat (2) is provided with an arc seat (21) located between adjacent driving arc plates (5), and the outer wall of the arc seat (21) is in sliding fit with the arc sleeve (431).

6. A stepped tension balancing device for a belt conveyor according to claim 5, characterized in that, The arc seat (21) is provided with a cross block (22), and a contact plate (6) is rotatably provided on the cross block (22). The contact plate (6) is provided with a first shaft hole (53) that is embedded and cooperates with the first shaft block (51), and a second shaft hole (54) that is embedded and cooperates with the second shaft block (52).

7. A stepped tension balancing device for a belt conveyor according to claim 6, characterized in that, The drive block (31) is fixedly mounted with a boss (34) located between the first arc surface (32) and the second arc surface (33), and the contact plate (6) is mounted with a contact piece (62) that slides with the end face of the boss (34).

8. A stepped tension balancing device for a belt conveyor according to claim 7, characterized in that, A guard strip (63) located on the outer edge of the belt (1) is fixedly installed on the contact plate (6).

9. A stepped tension balancing device for a belt conveyor according to claim 8, characterized in that, The guard strip (63) is provided with a long guard edge (631) and a short guard edge (632), and the adjacent long guard edge (631) and short guard edge (632) are respectively located on the two end faces of the belt (1).

10. A stepped tension balancing device for a belt conveyor according to claim 9, characterized in that, The deflected guard strip (63) causes the ends of both the long guard strip (631) and the short guard strip (632) to fit against the surface of the belt (1).

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