Stepped tension balancing device for belt conveyor

Abstract

The invention discloses a stepped tension balancing device for a belt conveyor, which comprises round seats mounted on a side frame of the conveyor, a rotary drum is rotatably arranged between the two round seats, and symmetrically arranged outer covers of which the outer side walls abut against the surface of a belt are movably arranged on the rotary drum; and a driving arc plate for pushing the two outer covers to be far away from each other is movably arranged on the round seat. According to the stepped tension balancing device for the belt conveyor, the first cambered surface and the second cambered surface on the rotating driving block sequentially abut against the two circumferentially-arranged driving arc plates to be opened through the rotating driving block, and the two ends of the driving arc plates sequentially abut against and push the two outer covers to be away from each other; and the second cambered surface is used for being matched with the belt when the deformation degree of the belt exceeds the normal deformation degree, so that the two outer covers have more tensioning strokes and are used for meeting the tensioning degree after the belt is completely deformed.

Description

Technical Field

[0001] The invention relates to the technical field of conveyor tension adjustment, and in particular to a stepped tension balancing device for a belt conveyor. Background Art

[0002] Belt conveyors, also known as belt conveyors, are commonly found in industrial and agricultural conveying mechanisms. A driving roller and multiple driven rollers are arranged on the inside of the belt, and the belt is driven to run and transport under the action of tensioning friction.

[0003] According to the publication (announcement) number: CN103896009A, the publication (announcement) date: 2014-07-02, a belt conveyor with a slope and a level connected.

[0004] In the prior art including the above-mentioned patents, belt conveyors with climbing functions and long strokes are usually equipped with a variety of tensioning mechanisms. For example, a tensioning bearing seat is set at the driven wheel at the end of the conveyor, and a center distance tensioning base is set between the driven wheel and the driving wheel. The two can only perform slight tensioning adjustments and tensioning with larger deformations on the belt, respectively. For conveyors with medium strokes, usually only the position of the driven wheel is tensioned and adjusted. Therefore, the adjustable stroke of the bearing seat is often unable to meet the deformation degree of the belt, and a new belt needs to be replaced in time, which easily causes waste of belts, increases the cost of workshop use and reduces production and transportation efficiency. Summary of the invention

[0005] The object of the present invention is to provide a stepped tension balancing device for a belt conveyor, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A step-type tension balancing device for a belt conveyor comprises a conveyor side frame provided with a belt, and a round seat installed on the conveyor side frame, a rotating drum is rotatably provided between the two round seats, and a symmetrically arranged outer cover with an outer wall abutting against the belt surface is movably provided on the rotating drum;

[0008] A driving arc plate for pushing the two outer covers away from each other is movably arranged on the round seat, and a first shaft block and a second shaft block are arranged on the side of the driving arc plate;

[0009] A driving block is rotatably arranged on the round seat, and a first arc surface and a second arc surface are formed on the driving block, wherein:

[0010] The first arc surface and the inner wall of the driving arc plate are in sliding cooperation, and the driving arc plate rotates with the first shaft block as the center;

[0011] The second arc surface is in sliding cooperation with the inner wall of the driving arc plate, and the driving arc plate rotates with the second shaft block as the center.

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

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

[0014] Preferably, telescopic rods arranged equidistantly are fixedly installed between the rotating drum and the outer cover.

[0015] Preferably, an arc sleeve is provided on the inner side of the outer cover and is slidably contacted with the outer side wall of the driving arc plate.

[0016] Preferably, the round seat is provided with an arc seat located between adjacent driving arc plates, and the outer side wall of the arc seat is slidably matched with the arc sleeve.

[0017] Preferably, a cross block is provided on the arc seat, a contact plate is rotatably provided on the cross block, and a first axial hole for embedding and cooperating with the first axial block and a second axial hole for embedding and cooperating with the second axial block are formed on the contact plate.

[0018] Preferably, a convex seat located between the first arc surface and the second arc surface is fixedly mounted on the driving block, and a contact piece slidably matched with the end surface of the convex seat is mounted on the contact plate.

[0019] Preferably, a guard strip located outside the edge of the belt is fixedly mounted on the contact plate.

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

[0021] Preferably, the deflected guard strip makes the ends of the long guard edge and the short guard edge fit the belt surface.

[0022] In the above technical scheme, the step-type tension balancing device for a belt conveyor provided by the present invention has the following beneficial effects: when the belt becomes loose, the two first arc surfaces are caused to contact with two circumferentially arranged driving arc plates along with the rotation of the driving block, so that the driving arc plates rotate and open with the first shaft block as the center, and the ends of the second shaft block on the driving arc plates are used to push the two outer covers away from each other, so that the two outer covers squeeze and tension the belts to achieve the purpose of straightening the belts. At this time, the straightened belts also stop rotating along with the driving block, so as to ensure the stability of the tensioning stroke of the outer covers on the belts. At the same time, during the process of tensioning the belts, the belts in the running state can use rolling friction to drive the outer covers to rotate. It cooperates with the rotating drum to provide an axis of rotation, which is used to reduce the interference of external forces such as sliding friction on the belt and reduce the problem of belt deformation damage. When the belt exceeds the normal deformation usage level, after the first arc surface reaches the maximum rotation position, the driving block that continues to rotate makes the second arc surface with a larger inclination angle to push and cooperate with the driving arc plate. At this time, the driving arc plate rotates with the second shaft block as the center of the circle, and uses the end at the position of the first shaft block to push the two outer covers away again, so that the two outer covers have more tensioning strokes to meet the tensioning degree of the belt after it is fully deformed, so that the belt on the conveyor has a longer service life, while also ensuring the stable operation of the conveyor and reducing interference with the workshop use cost and production transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

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

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

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

[0027] Figure 4 A front schematic diagram of a tensioning mechanism provided by an embodiment of the present invention;

[0028] Figure 5 An exploded schematic diagram of a tensioning mechanism provided by an embodiment of the present invention;

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

[0030] Figure 7 A schematic diagram of a tensioning mechanism provided by an embodiment of the present invention from a front cross-sectional and back perspective;

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

[0032] Fig. 9 A schematic diagram of assembling the driving arc plate, the contact plate and the guard strips thereon provided in an embodiment of the present invention.

[0033] Description of reference numerals:

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

[0035] In order 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 step-type tension balancing device for a belt conveyor includes a conveyor side frame 11 provided with a belt 1, and also includes a round seat 2 installed on the conveyor side frame 11, a rotating drum 4 is rotatably arranged between the two round seats 2, and an outer cover 42 with an outer wall abutting against the surface of the belt 1 and arranged symmetrically is movably arranged on the rotating drum 4;

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

[0038] A driving block 31 is rotatably disposed on the round seat 2, and a first arc surface 32 and a second arc surface 33 are formed on the driving block 31, wherein:

[0039] The first arc surface 32 is in sliding cooperation with the inner wall of the driving arc plate 5, and the driving arc plate 5 rotates with the first shaft block 51 as the center;

[0040] The second arc surface 33 is slidably matched with the inner wall of the driving arc plate 5 , and the driving arc plate 5 rotates with 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 roller and the tensioning mechanism used to drive the belt 1 have stable working conditions.

[0042] Furthermore, a torsion spring is provided between the driving block 31 and the round seat 2, and the torsion spring is pre-charged so that the torsion spring can recover its deformation when the belt 1 is loosened, and is used to rotate and reset the driving block 31, thereby providing rotational power.

[0043] Furthermore, the outer cover 42 has a range of movement radially away from the axis, and the belt 1 is tensioned by utilizing the interval generated by the two outer covers 42, so that a more obvious tensioning effect is achieved.

[0044] Furthermore, the first arc surface 32 on the annular side wall of the driving block 31 is connected to the second arc surface 33, and the inclination angle of the arc surface gradually increases from the first arc surface 32 to the position of the second arc surface 33, that is, the distance between the two points at the relative positions of the two first arc surfaces 32 gradually increases, and the inclination angle of the second arc surface 33 is greater than the inclination angle of the first arc surface 32, that is, although the two are connected, the inclination angle increases gradually. At the same time, the first arc surface 32 and the second arc surface 33 are a group, with two groups arranged circumferentially on the annular side wall, so as to push against the two driving arc plates 5, so that the driving arc plates 5 form a transfer plate that pushes to open.

[0045] Furthermore, a slider is fixedly installed on the driving arc plate 5, and an arc-shaped groove for the slider to slide is opened on the end surface of the round seat 2, and an arc-shaped spring and a limit member are fixedly installed between the slider and the groove, with the purpose of providing sliding conditions for the opening action of the driving arc plate 5. The positions of the two arc-shaped grooves are not symmetrical, but are staggered, and the positions need to correspond to the first shaft block 51 and the second shaft block 52 after the switching position. At the same time, the setting method of the spring and the limit member is the existing technology, which only needs to provide stable sliding and non-separation, and will not be elaborated here.

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

[0047] When the belt 1 becomes loose, the driving block 31 rotates to make the two first arc surfaces 32 contact the two circumferentially arranged driving arc plates 5, so that the driving arc plates 5 rotate and open with the first shaft block 51 as the center, and use the end of the second shaft block 52 on the driving arc plate 5 to push the two outer covers 42 away from each other, so that the two outer covers 42 squeeze and tension the belt 1 to achieve the purpose of straightening the belt 1. At this time, the straightened belt 1 also stops rotating along with the driving block 31 to ensure that the tensioning stroke of the belt 1 by the outer covers 42 is stable. At the same time, when the two outer covers 42 are in the process of tensioning the belt 1, the belt 1 in the running state 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 Less interference to the belt 1 caused by external forces such as sliding friction is caused, and the deformation damage problem of the belt 1 is reduced. When the belt 1 exceeds the normal deformation usage level, after the first arc surface 32 reaches the maximum rotation position, the driving block 31 that continues to rotate makes the second arc surface 33 with a larger inclination angle to push and cooperate with the driving arc plate 5, and at this time the driving arc plate 5 rotates with the second shaft block 52 as the center of the circle, 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 tensioning strokes to meet the tensioning degree of the belt 1 after it is fully deformed, so that the belt 1 on the conveyor has a longer service life, while also ensuring the stable operation of the conveyor, reducing interference with the workshop use cost and production and transportation efficiency.

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

[0049] A connecting rod 7 movably connected to a slide plate 71 is fixedly sleeved on the rotating shaft 3 , and a slide plate 71 is hingedly provided at the end of the connecting rod 7 to slide against the inner surface of the belt 1 .

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

[0051] Furthermore, the connecting rod 7 is tilted in the default state and installed at the end of the rotating shaft 3. The two connecting rods 7 are staggered in opposite directions. From the perspective of the connecting rod 7 as a horizontal plane, the two connecting rods 7 and the rotating shaft 3 therebetween present a "Z" shape, so that the two slide plates 71 can slide against the inner end surface of the belt 1, and the two slide plates 71 can receive the friction force relative to the running direction of the belt 1, and then use the friction force to limit the slide plate 71.

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

[0053] After the belt 1 becomes loose, the belt 1 that was originally attached to the end face of the slide plate 71 cannot provide the opposite friction force, so that the slide plate 71 moves laterally away from the tensioning mechanism, and is accompanied by the deformation recovery of the torsion spring on the drive block 31, thereby realizing the reset by using the torsion spring that has stored force in advance, so that the drive block 31 can rotate and push, without the need for external drive or the use of the drive on the conveyor, and the force transmitted by the slide plate 71 used for slack judgment is divided by the connecting rod 7, because the best way to identify slack is to apply force perpendicular to the belt 1, but the judgment force perpendicular to the belt 1 will push on the belt 1 by itself, and under long-term use, it will squeeze the belt 1 to cause deformation, and the connecting rod 7 will diagonally divide the force used for identification, which can effectively reduce the extrusion damage to the belt 1 caused by the force stored in the torsion spring, and at the same time, the slide plate 71 that has lost the friction limit can also respond quickly to make the outer cover 42 perform tensioning work.

[0054] As another embodiment further provided by the present invention, telescopic rods 41 arranged equidistantly are fixedly installed between the rotating drum 4 and the outer cover 42 .

[0055] Specifically, a tension spring is disposed in the telescopic rod 41 , and the arrangement of the tension spring is prior art and will not be described in detail herein.

[0056] By providing a telescopic rod 41 with a tension spring, on the one hand, the equidistantly arranged telescopic rods 41 can connect and fix the rotating drum 4 and the two outer covers 42, thereby increasing the stability during the tensioning of the belt 1. On the other hand, the tension spring in the telescopic rod 41 will not cause extrusion damage to the belt 1, thereby protecting the belt 1.

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

[0058] Specifically, a bracket 43 is fixedly mounted on the inner wall of the outer cover 42, and an arc sleeve 431 is fixedly mounted on the bracket 43, and the two arc sleeves 431 on the round seat 2 are symmetrically arranged so that the circumferentially arranged driving arc plates 5 can push the arc sleeves 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 arc sleeve 431 , so that the arc sleeve 431 is lifted up by the driving arc plate 5 during the rotation process, thereby avoiding the problem of the outer cover 42 being stuck during rotation.

[0060] Furthermore, a plurality of balls are evenly spaced on the inner wall of the arc sleeve 431 , and are used to reduce the friction between the arc sleeve 431 and the driving arc plate 5 .

[0061] The arc sleeve 431 rotates with the outer cover 42 and is pushed by the opened driving arc plate 5 to move the two arc sleeves 431 away from each other, and is used to drive 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. At the same time, the ball 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 operation efficiency of the belt 1.

[0062] As another embodiment further provided by the present invention, an arc seat 21 located between adjacent driving arc plates 5 is provided on the round seat 2 , and the outer side wall of the arc seat 21 is slidably matched with the arc sleeve 431 .

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

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

[0065] As another embodiment further provided by the present invention, a cross block 22 is provided on the arc seat 21, a touch plate 6 is rotatably provided on the cross block 22, and the touch plate 6 is provided with a first axial hole 53 which is embedded and matched with the first axial block 51, and a second axial hole 54 which is embedded and matched with the second axial block 52.

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

[0067] Furthermore, a shaft 61 is fixedly mounted on the side of the contact plate 6, and the shaft 61 is rotatably disposed on a short protrusion of the cross block 22 (such as 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 enough 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 driving arc plate 5 can rotate and open from the first shaft hole 53 and the second shaft hole 54 in turn after switching positions.

[0069] Furthermore, the length of the first shaft block 51 is greater than that of the second shaft block 52, so that when the first shaft block 51 rotates as the center of the circle in the default state, the second shaft block 52 slides against the end surface of the touch plate 6 to ensure the working stability of the tensioning mechanism in the normal deformation state.

[0070] By the default state, the first shaft block 51 rotates in the first shaft hole 53, and when the driving arc plate 5 is contacted by the first arc surface 32 and opened, the second shaft block 52 follows an arc-shaped motion trajectory until it reaches the end of the stroke and reaches the end of the second shaft hole 54, so as to perform position switching. When the contact plate 6 is deflected by the shaft 61, the short second shaft block 52 is inserted into the second shaft hole 54, and the first shaft block 51 is pulled out of the first shaft hole 53, so that when the driving arc plate 5 extends the opening stroke, the first shaft block 51 contacts the end surface of the deflected contact plate 6 and slides in an arc-shaped motion trajectory, thereby completing the work of changing the rotation center of the driving arc plate 5 position switching, and improving the range of tensioning adjustment of the tensioning mechanism on the belt 1.

[0071] As another embodiment further provided by the present invention, a convex seat 34 located between the first arc surface 32 and the second arc surface 33 is fixedly mounted on the driving block 31 , and a contact piece 62 slidably matched with the end surface of the convex seat 34 is mounted on the contact plate 6 .

[0072] Specifically, the boss 34 is installed on the end surface of the driving block 31 and is located at a position where two arc surfaces are connected, and an inclined cutout is provided at the end of the boss 34 so that the boss 34 can slide in contact with the contact piece 62 more easily, thereby increasing the running smoothness.

[0073] Furthermore, the contact piece 62 is located at the first shaft hole 53 so that the long first shaft block 51 can be pulled out from the first shaft hole 53 (eg Fig. 9 shown).

[0074] When the rotating driving block 31 reaches the switching position between the first arc surface 32 and the second arc surface 33, the inclined surface on the protrusion 34 preferentially contacts the contact plate 62, and lifts up the contact plate 62 to make the contact plate 6 rotate around the shaft 61, 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 stroke increase, so that the operation of increasing the tensioning stroke of the outer cover 42 is more convenient.

[0075] As another embodiment further provided by the present invention, a guard strip 63 located outside the edge of the belt 1 is fixedly mounted on the contact plate 6 .

[0076] Specifically, Figure 3 and Figure 4As shown, the guard strip 63 is located on the end surface of the contact plate 6 where no axial hole is formed, and the length of the guard strip 63 is greater than the outer diameter of the two outer covers 42 after the maximum tension stroke is reached, so that the guard strip 63 can perform 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 side edges of the belt 1 are also located between the longitudinally arranged guard strips 63 .

[0078] By providing the guard strip 63 on the outside of the belt 1, the guard strip 63 can use its inner end surface to form a blocking protection for the edge of the belt 1, thereby reducing the deviation of the belt 1. At the same time, the guard strip 63 can also shield the components in the round seat 2, thereby reducing the problem of material or debris intrusion.

[0079] As another embodiment further provided by 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 edges 631 and short guard edges 632 are respectively located at the end surfaces of both sides of the belt 1 .

[0080] Specifically, Figure 3 and Figure 7 As shown, the long guard 631 and the short guard 632 are of the same length, but depend on the length of the end of the guard strip 63, that is, the protruding length of the guard, in order to form a gap of the conveyor belt 1 between the inner wall of the long guard 631 and the outer wall of the short guard 632.

[0081] When the belt 1 is arranged, its outer surface is close to the outer wall of the short edge guard 632 and its inner surface is close to the inner wall of the long edge guard 631, so that the two edge guards form a limiting function for the belt 1, and at the same time, the anti-deviating effect of the guard strip 63 on the edge of the belt 1 can be enhanced. In addition, when the surface of the belt 1 is taken as a horizontal perspective, the upper and lower long edge guards 631 and the short edge guards 632 can also indirectly limit the loose belt 1, further reducing the deviation of the belt 1 when it is loose.

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

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

[0084] The deflected contact plate 6 drives the guard strip 63 to deflect, and the end of the raised short guard edge 632 actively contacts the outer surface of the belt 1, and the end of the sunken long guard edge 631 actively contacts the inner surface of the belt 1 (such as Figure 8As shown), the clamping function of the edge of the belt 1 is realized, so as to assist in straightening the belt 1 during the stroke switching process to avoid the problem of the belt 1 being loose again during the switching stroke. At the same time, the deflected protective strip 63 can also make its end face actively move closer to the edge of the belt 1, and cooperate with the longitudinal protective strips 63 arranged on the two round seats 2 to synchronously fit the edge of the belt 1, so as to realize the positioning and deviation correction of the belt 1 during the switching stroke, effectively reduce the slack deviation problem of the belt 1 during the switching stroke, and ensure the stability of the belt 1 during the tensioning process.

[0085] Working principle: when the belt 1 becomes loose, the belt 1 that was originally attached to the end surface of the slide plate 71 cannot provide the opposite friction force, so that the slide plate 71 moves laterally away from the tensioning mechanism, and accompanied by the torsion spring on the driving block 31 recovering its deformation, the torsion spring with pre-accumulated force is used to reset, so that the driving block 31 can rotate and push, and accompanied by the rotation of the driving block 31, the two first arc surfaces 32 are against the two circumferentially arranged driving arc plates 5, so that the driving arc plates 5 rotate and open with the first shaft block 51 as the center, and the end of the second shaft block 52 on the driving arc plate 5 is used to push the two outer covers 42 away from each other, so that the two outer covers 42 squeeze and tension the belt 1, so as to achieve the purpose of straightening the belt 1, and at this time, the straightened belt 1 is also accompanied by the driving The movable block 31 stops rotating. At the same time, during the process of tensioning the belt 1, the two outer covers 42 can use rolling friction to drive the outer covers 42 to rotate in the running state, and cooperate with the rotating drum 4 to provide an 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 usage degree, after the first arc surface 32 reaches the maximum rotation position, the driving block 31 that continues to rotate makes the second arc surface 33 with a larger inclination angle to push and cooperate with the driving arc plate 5. At this time, the driving arc plate 5 rotates with the second shaft block 52 as the center of the circle, 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 tensioning strokes to meet the tensioning degree of the belt 1 after it is fully deformed.

[0086] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that 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 above 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) provided with a belt (1), characterized in that: It also includes a round seat (2) mounted on the conveyor side frame (11), a rotating drum (4) is rotatably arranged between the two round seats (2), and an outer cover (42) is movably arranged on the rotating drum (4) and has an outer wall that contacts the surface of the belt (1) and is symmetrically arranged; A driving arc plate (5) for pushing the two outer covers (42) away from each other is movably arranged on the round seat (2), and a first shaft block (51) and a second shaft block (52) are arranged on the side of the driving arc plate (5); A driving block (31) is rotatably arranged on the round seat (2), and a first arc surface (32) and a second arc surface (33) are formed on the driving block (31), wherein: When the first arc surface (32) and the inner wall of the driving arc plate (5) are in sliding cooperation, the driving arc plate (5) rotates with the first shaft block (51) as the center; When the second arc surface (33) and the inner wall of the driving arc plate (5) are in sliding cooperation, the driving arc plate (5) rotates with the second shaft block (52) as the center.

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

3. A stepped tension balancing device for a belt conveyor according to claim 2, characterized in that: Telescopic rods (41) arranged at equal distances are fixedly installed 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: An arc sleeve (431) is arranged on the inner side of the outer cover (42) and is slidably contacted with the outer side wall of the driving arc plate (5).

5. A step-type tension balancing device for a belt conveyor according to claim 4, characterized in that: The round seat (2) is provided with an arc seat (21) located between adjacent driving arc plates (5), and the outer side wall of the arc seat (21) is slidably matched with the arc sleeve (431).

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

7. A step-type tension balancing device for a belt conveyor according to claim 6, characterized in that: The driving block (31) is fixedly provided with a convex seat (34) between the first curved surface (32) and the second curved surface (33), and the contact receiving plate (6) is provided with a contact receiving piece (62) which is slidably matched with the end surface of the convex seat (34).

8. A step-type tension balancing device for a belt conveyor according to claim 7, characterized in that: A protective strip (63) located outside the edge of the belt (1) is fixedly mounted on the contact plate (6).

9. A step-type 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 edges (631) and short guard edges (632) are respectively located on the end surfaces of both sides of the belt (1).

10. A step-type tension balancing device for a belt conveyor according to claim 9, characterized in that: The deflected guard strip (63) enables the ends of the long guard edge (631) and the short guard edge (632) to fit the surface of the belt (1).

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