Adaptive Variable Arc Device for Belt Conveyor Idlers

Abstract

A belt conveyor idler self-adaptive variable arc device belongs to the technical field of belt conveyors. It includes a frame group composed of a first-level frame, a second-level frame, a third-level I-shaped frame and a third-level II-shaped frame, and a sliding support group with one end slidably connected to the frame group and the other end fixed to the first girder and the second girder, ensuring that the idlers arranged on the frame group always arrange along an approximate arc when the first girder and the second girder rotate relative to each other. This device forms a self-adaptive variable arc structure through the frame group and the sliding support group, reducing the number of belt conveyors on mobile bulk material conveying equipment, reducing the costs of belt conveyor drive units, drums and electric control systems; reducing the complexity of the control system and the control difficulty; reducing the frequency of deviation faults occurring in belt conveyors with short lengths; reducing the number of transfer points and the frequency of transfer point faults. At the same time, the seven-section frame adopts a truss structure form, improving the stiffness of the frame and ensuring the stability of the structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of belt conveyors, and particularly relates to an adaptive variable-arc device for idlers of a belt conveyor. Background Art

[0002] During the use of mobile bulk material conveying equipment, the movement of the equipment often brings about height changes in the feeding point or the discharging point, or due to the change in the equipment attitude after relocation, the height of the feeding point or the discharging point of the equipment will also change. The feeding arm or the discharging arm of the mobile bulk material conveying equipment usually adopts a pitching method to adapt to the height change of the discharging point or the feeding point. After the pitching adjustment of the feeding arm and the discharging arm, the included angle formed between the two changes accordingly, and a folding point with a changing angle is formed at the change of the included angle. It is difficult for a single belt conveyor to work properly under the working conditions with a folding point. In the design process of mobile bulk material conveying equipment, a technical solution of respectively arranging a belt conveyor for the feeding arm and the discharging arm is often adopted to adapt to this change. Therefore, the number of belt conveyors on mobile bulk material conveying equipment is usually two or more. However, the material conveying distance of mobile bulk material conveying equipment is often only dozens of meters. Originally, a single belt conveyor can complete the function of material transfer and conveying, but two or more belt conveyors are used to convey materials. The increase in the number of belt conveyors brings the following three main problems:

[0003] 1. The equipment cost increases. The increase in the number of belt conveyors leads to an increase in the number of drive units, rollers, and electric control systems, resulting in an increase in equipment cost;

[0004] 2. The equipment control difficulty increases. Each belt conveyor has separate components such as a driving device and a protection device. The increase in the number of belt conveyors leads to an increase in the control points of the mobile bulk material conveying equipment, a complex control logic, and an increase in control difficulty;

[0005] 3. The equipment failure rate increases. The use of multiple belt conveyors results in short belt conveyors, and shorter belt conveyors are more likely to have accidents such as deviation. Therefore, compared with using a single belt conveyor for conveying, using multiple short belt conveyors will greatly increase the risk of deviation accidents of the belt conveyor. In addition, the transfer point is the most prone to failure part of the belt conveyor system. For each additional belt conveyor, the number of transfer points will increase by one accordingly, and the possibility of failure will also increase.

[0006] In summary, for mobile bulk material conveying equipment, using a smaller number of belt conveyors will be beneficial to reduce equipment cost, reduce control difficulty, and improve equipment operation reliability. However, the problem of a single belt conveyor adapting to the pitching angle change of the feeding arm or the discharging arm has not been solved yet. Summary of the Invention

[0007] Aiming at the deficiencies of the existing technology, the object of the present invention is to provide a self-adaptive variable arc device for the idlers of a belt conveyor, so as to realize the self-adaptive formation of an arc transition at the turning point of the belt conveyor when the receiving arm or discharging arm of a mobile bulk material conveying equipment pitches, and avoid the situation of increasing the number of belt conveyors due to the change of the turning point angle.

[0008] The technical solution adopted by the invention is as follows: a self-adaptive variable arc device for the idlers of a belt conveyor, the technical key points of which include a frame group composed of a first-level frame, a second-level frame, a third-level I-shaped frame and a third-level II-shaped frame, and a sliding support group composed of a first-level sliding support, a second-level sliding support and a third-level sliding support. The first-level frame is respectively connected to the second-level frame and the third-level I-shaped frame, the third-level I-shaped frame is connected to the second-level frame, and the second-level frame is connected to the third-level II-shaped frame. Idlers are respectively installed on the first-level frame, the second-level frame, the third-level I-shaped frame and the third-level II-shaped frame. The first-level sliding support slidably connected to the first-level frame, the second-level sliding support slidably connected to the second-level frame and the third-level sliding support slidably connected to the third-level II-shaped frame are sequentially fixed on a first girder and a second girder which are connected together and have a variable included angle on a mobile bulk material conveying equipment. The first-level frame, the second-level frame, the third-level I-shaped frame and the third-level II-shaped frame form a multi-segment broken line similar to an arc with the change of the angles of the first girder and the second girder, so that the idlers are arranged along an arc approximately.

[0009] In the above solution, the first-level frame is composed of a first main beam, a second main beam and a third main beam, and the second-level frame is mainly composed of a first main beam and a second main beam. Both ends of the first main beam of the first-level frame are slidably connected to the first-level sliding support respectively. Both ends of the second main beam of the first-level frame are respectively hinged to one end of the first main beam of two second-level frames. The other end of the first main beam of the second-level frame is slidably connected to the second-level sliding support. Both ends of the third main beam of the first-level frame are respectively hinged to one end of the main beam of two third-level I-shaped frames. The other end of the main beam of the third-level I-shaped frame is slidably connected to one end of the second main beam of the second-level frame. The other end of the second main beam of the second-level frame is hinged to one end of the main beam of the third-level II-shaped frame. The other end of the main beam of the third-level II-shaped frame is slidably connected to the third-level sliding support.

[0010] In the above solution, the first-level frame is composed of a first main beam, a second main beam, and a third main beam, and the second-level frame is mainly composed of a first main beam and a second main beam; both ends of the first main beam of the first-level frame are slidably connected to first-level sliding brackets, and both ends of the second main beam of the first-level frame are respectively hinged to one end of the first main beams of two second-level frames. The other end of the first main beam of the second-level frame is slidably connected to a second-level sliding bracket; both ends of the third main beam of the first-level frame are respectively slidably connected to one end of the main beams of two third-level type-I frames, the other end of the main beam of the third-level type-I frame is hinged to one end of the second main beam of the second-level frame, the other end of the second main beam of the second-level frame is hinged to one end of the main beam of the third-level type-II frame, and the other end of the main beam of the third-level type-II frame is slidably connected to a third-level sliding bracket.

[0011] In the above solution, both the third-level type-I frame and the third-level type-II frame are mainly composed of one main beam.

[0012] In the above solution, both the third-level type-I frame and the third-level type-II frame are mainly composed of one main beam and support beams connected to the main beam to form a quadrilateral with the main beam.

[0013] In the above solution, the first-level frame is composed of a first main beam and a third main beam; the second-level frame is mainly composed of a first main beam and a second main beam;

[0014] Both ends of the first main beam of the first-level frame are slidably connected to first-level sliding brackets, and both sides of the inward protrusion of the first main beam of the first-level frame are respectively hinged to one end of the first main beams of two second-level frames. The other end of the first main beam of the second-level frame is slidably connected to a second-level sliding bracket; both ends of the third main beam of the first-level frame are respectively hinged to one end of the main beams of two third-level type-I frames, the other end of the main beam of the third-level type-I frame is slidably connected to one end of the second main beam of the second-level frame, the other end of the second main beam of the second-level frame is hinged to one end of the third-level type-II frame, and the other end of the third-level type-II frame is slidably connected to a third-level sliding bracket.

[0015] In the above solution, both the third-level type-I frame and the third-level type-II frame are mainly composed of one main beam.

[0016] In the above solution, both the third-level type-I frame and the third-level type-II frame are mainly composed of one main beam and support beams connected to the main beam.

[0017] In the above solution, a guiding device is provided on the first-level frame. The guiding device is sleeved on a shaft coaxial with the hinge shaft between the first girder and the second girder through an oblong hole, so that the moving direction of the first-level frame relative to the first girder and the second girder is maintained in the angular bisector direction or the opposite direction of the included angle formed by the first girder and the second girder.

[0018] The beneficial effects of the present invention are as follows: The belt conveyor idler self-adaptive variable arc device includes a frame group composed of a first-level frame, a second-level frame, a third-level type I frame, and a third-level type II frame, and a sliding support group with one end slidably connected to the frame group and the other end fixed to the first girder 102 and the second girder 103, ensuring that the idlers arranged on the frame group are arranged along an approximate arc. This device forms a self-adaptive variable arc structure through the frame group and the sliding support group, reducing the number of belt conveyors on mobile bulk material conveying equipment, reducing the costs of belt conveyor drive units, drums, and electric control systems; reducing the complexity of the control system and the control difficulty; reducing the frequency of deviation faults occurring in belt conveyors with short lengths; reducing the number of transfer points and the frequency of transfer point faults. At the same time, the seven-section frame adopts a truss structure form, improving the stiffness of the frame and ensuring the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0021] Figure 2 is Figure 1 the A-A cross-sectional view of

[0022] Figure 3 is a schematic diagram of the first-level frame of Embodiment 1 of the present invention;

[0023] Figure 4 is a schematic diagram of the second-level frame of Embodiment 1 of the present invention;

[0024] Figure 5 is a schematic diagram of the third-level type I frame of Embodiment 1 of the present invention;

[0025] Figure 6 is a schematic diagram of the third-level type II frame of Embodiment 1 of the present invention;

[0026] Figure 7 is a schematic diagram of the first-level sliding support of Embodiment 1 of the present invention;

[0027] Figure 8 is a schematic diagram of the second-level sliding support of Embodiment 1 of the present invention;

[0028] Figure 9 is a schematic diagram of the third-level sliding support of Embodiment 1 of the present invention;

[0029] Figure 10 It is a schematic structural diagram of Embodiment 3 of the present invention;

[0030] Figure 11 It is a schematic diagram of the first-level frame of Embodiment 3 of the present invention;

[0031] Figure 12 It is a schematic diagram of the second-level frame of Embodiment 3 of the present invention;

[0032] Figure 13 It is a schematic structural diagram of Embodiment 5 of the present invention;

[0033] Figure 14 It is a schematic structural diagram of Embodiment 6 of the present invention.

[0034] The descriptions of the serial numbers in the figure are as follows:

[0035] The first-level frame 1, the second-level frame 2, the third-level type-I frame 3, the third-level type-II frame 4, the first-level sliding bracket 5, the second-level sliding bracket 6, the third-level sliding bracket 7, the first-level sliding device A 11, the second-level articulated device A assembly 12, the third-level articulated device A of the first-level frame 13, the first main beam 14 of the first-level frame, the second main beam 15 of the first-level frame, the third main beam 16 of the first-level frame, the third-level sliding device A of the first-level frame 17, the second-level articulated device 21, the second-level sliding device 22, the third-level sliding device of the second-level frame 23, the third-level articulated device of the second-level frame 24, the first main beam 25 of the second-level frame, the second main beam 26 of the second-level frame, the third-level articulated device B assembly 31 of the third-level type-I frame, the third-level sliding device B 32 of the third-level type-I frame, the main beam 33 of the third-level type-I frame, the third-level articulated device B assembly 41 of the third-level type-II frame, the third-level sliding device A assembly 42 of the third-level type-II frame, the main beam 43 of the third-level type-II frame, the first-level sliding device B 51 of the first-level sliding bracket, the second sliding device B assembly 61 of the second-level sliding bracket, the third sliding device B assembly 71 of the third-level sliding bracket. Specific Embodiments

[0036] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following combines the attached Figure 1-12 drawings and specific embodiments to further elaborate on the present invention in detail. Embodiment 1:

[0037] The present invention provides a belt conveyor idler self - adaptive variable - arc device, which comprises two major parts: a frame group 100 and a sliding support group 101. Among them, the frame group 100 includes seven frames, namely, one first - level frame 1, two second - level frames 2, two third - level type - I frames 3, and two third - level type - II frames 4. Idlers are installed on the frame group 100, and the frame group 100 forms a multi - segment broken line similar to an arc along with the angle changes of the first girder 102 and the second girder 103 so that the idlers are arranged along an approximate arc. The sliding support group 101 includes six sliding supports, namely, two first - level sliding supports 5, two second - level sliding supports 6, and two third - level sliding supports 7.

[0038] The first - level frame 1 is arranged in the exact middle of the frame group 100. The first - level frame 1 includes a first main beam 14, a second main beam 15, and a third main beam 16. At both ends of the first main beam 14, there are first - level sliding devices A11, and the sliding device A11 cooperates with the first - level sliding device B51 located on the first - level sliding support 5 to form a sliding assembly. In this embodiment, the first - level sliding device B51 can be a track, and the first - level sliding device A is a convex platform sliding along the track. This embodiment does not limit the sliding connection assembly, and users can choose according to actual needs. The above is only an example for illustration. At both ends of the second main beam 15, there are respectively second - level hinged devices A12, and at both ends of the third main beam 16, there are third - level hinged devices A13. In this embodiment, the second - level hinged device A12 and the third - level hinged device A13 are connecting lugs. This embodiment does not limit the hinged device, and users can choose according to actual needs. The above is only an example for illustration.

[0039] Both ends of the first main beam 14 of the first - level frame 1 are respectively slidably connected to the first - level sliding supports 5, and both ends are respectively supported by the first - level sliding supports 5. The second main beam 15 of the first - level frame 1 is hinged to one end of the first main beam 25 of two second - level frames respectively through hinge points located on the left and right sides. The other ends of the first main beams 25 of the two second - level frames are respectively slidably connected to the second - level sliding supports 6 and supported by the second - level sliding supports 6. One end of the main beam 33 of the third - level type - I frame 3 is hinged to one end of the third main beam 16 of the first - level frame, and the other end of the main beam of the third - level type - I frame is slidably connected to one end of the second main beam 26 of the second - level frame. One end of the main beam 43 of the third - level type - II frame 4 is hinged to the other end of the second main beam 26 of the second - level frame, and the other end of the main beam 43 of the third - level type - II frame is slidably connected to the third - level sliding support 7.

[0040] On the left and right sides of the first-level frame 1 are, in sequence, the third-level I-shaped frames 3 (one on each side), the second-level frames 2 (one on each side), and the third-level II-shaped frames 4 (one on each side). Among them, the second-level frame 2 is mainly composed of the first main beam 25 and the second main beam 26 of the second-level frame. One end of the first main beam 25 of the second-level frame is provided with a second-level hinge device 21, and the other end is provided with a second-level sliding device 22. The second-level sliding device 22 cooperates with the second-level sliding device B61 on the second-level sliding bracket 6 to form a sliding assembly. Among them, the second-level sliding device 22 can be a convex platform, and the second-level sliding device B61 is a slide rail that provides a track for the convex platform. One end of the second main beam 26 of the second-level frame is provided with a third-level hinge device 24 of the second-level frame, and the other end is provided with a third-level sliding device 23 of the second-level frame. The third-level sliding device 23 of the second-level frame cooperates with the third-level sliding device 32 at one end of the third-level I-shaped frame 3 to form a sliding assembly. The third-level I-shaped frame 3 in this embodiment is mainly composed of a main beam 33 and support beams connected to the main beam 33 to form a quadrilateral structure. One end of the third-level I-shaped frame 3 is a third-level hinge device B assembly 31 of the third-level I-shaped frame, and one end is provided with a third-level sliding device B32. The third-level II-shaped frame 4 in this embodiment is mainly composed of a main beam 43 and support beams forming a quadrilateral structure with the main beam 43. One end of its main beam 43 is a third-level hinge device B assembly 41 of the third-level II-shaped frame, and the other end of the main beam 43 is provided with a third-level sliding device A42. The third-level sliding device A42 cooperates with the third-level sliding device B71 on the third-level sliding bracket 7 to form a sliding assembly.

[0041] In this embodiment, the first-level frame 1, the second-level frame 2, the third-level I-shaped frame 3, and the third-level II-shaped frame 4 adopt a truss structure, and rollers of the belt conveyor are installed on the truss.

[0042] The other ends of the first-level sliding bracket 5, the second-level sliding bracket 6, and the third-level sliding bracket 7 are respectively fixedly connected to the beam one 102 and the beam two 103 with variable angles on the mobile bulk material conveying equipment. They are fixed along the beam one 102 and the beam two 103 respectively from both sides of the connection axis of the beam one 102 and the beam two 103. The position sequence is, in turn, the first-level sliding bracket 5 (one on each of the beam one 102 and the beam two 103), the second-level sliding bracket 6 (one on each of the beam one 102 and the beam two 103), and the third-level sliding bracket 7 (one on each of the beam one 102 and the beam two 103).

[0043] A guiding device 18 is provided on the first-level frame 1. The guiding device 18 is arranged in the middle at the lower part of the first-level frame 1. The long circular hole of the guiding device 18 is perpendicular to the third main beam 16 of the first-level frame 1 and sleeved on the shaft coaxial with the hinge shaft between the first girder 102 and the second girder 103, so that the moving direction of the first-level frame 1 relative to the first girder 102 and the second girder 103 is maintained in the angular bisector direction or the reverse direction of the included angle formed by the first girder 102 and the second girder 103. The relative angle change between the first girder 102 and the second girder 103 drives the position change of the first-level sliding support 5, the second-level sliding support 6 and the third-level sliding support 7, and further drives the height and angle of the first-level frame 1, the second-level frame 2, the third-level I-shaped frame 3 and the third-level II-shaped frame 4 to change accordingly, forming a broken line of approximately seven circular arcs adapted to the angle change.

[0044] The arc-changing device adopted in this embodiment has a truss structure, which reduces the number of belt conveyors on the mobile bulk material conveying equipment, reduces the costs of the belt conveyor drive units, rollers and electric control systems; reduces the complexity of the control system and the control difficulty; reduces the frequency of deviation faults occurring in the belt conveyor with a short length; reduces the number of transfer points and the frequency of transfer point faults. At the same time, the seven-section frame adopts a truss structure form, which improves the stiffness of the frame and ensures the stability of the structure. Embodiment 2:

[0045] The difference between this embodiment and Embodiment 1 is that the third-level I-shaped frame 3 and the third-level II-shaped frame 4 in this embodiment adopt a plate beam structure with a single main beam. Embodiment 3:

[0046] The difference between this embodiment and Embodiment 1 is that third-level sliding devices A17 are provided at both ends of the third main beam 16 of the first-level frame 1 in this embodiment, and the third-level sliding device A17 cooperates with the third-level sliding device B32 at one end of the main beam of the third-level I-shaped frame 3 to form a sliding assembly.

[0047] The specific structure is as follows: One end of the third main beam 16 of the first-level frame 1 is slidably connected to one end of the main beam 33 of the third-level I-shaped frame 3, and the other end of the main beam 33 of the third-level I-shaped frame 3 is hinged to one end of the second main beam 26 of the second-level frame 2. The other end of the third main beam 16 of the first-level frame 1 is slidably connected to one end of the main beam 33 of another third-level I-shaped frame 3. The connection of other components is the same as the above content and will not be repeated. Embodiment 4:

[0048] The difference between this embodiment and Embodiment 3 is that the third-level I-shaped frame 3 and the third-level II-shaped frame 4 in this embodiment adopt a plate beam structure with a single main beam. Embodiment 5:

[0049] The difference between this embodiment and Embodiment 1 is that the first-level frame 1 of this embodiment is composed of the first main beam 14 and the third main beam 16 of the first-level frame. The second-level frame 2 is mainly composed of the first main beam 25 and the second main beam 26 of the second-level frame.

[0050] Both ends of the first main beam 14 of the first-level frame are respectively slidably connected to the first sliding brackets 5. The center of the first main beam 14 of the first-level frame protrudes downward, and both sides of the protruding part are respectively hinged to one end of the first main beams 25 of the two second-level frames. The other end of the first main beam 25 of the second-level frame is slidably connected to the second sliding brackets 6; both ends of the third main beam 16 of the first-level frame are respectively hinged to one end of the main beams 33 of the two third-level I-shaped frames. The other end of the main beam 33 of the third-level I-shaped frame is slidably connected to one end of the second main beam 26 of the second-level frame. The other end of the second main beam 26 of the second-level frame is hinged to one end of the main beam 43 of the third-level II-shaped frame. The other end of the main beam 43 of the third-level II-shaped frame is slidably connected to the third sliding brackets 7. The third-level I-shaped frame 3 and the third-level II-shaped frame 4 are both mainly composed of one main beam. Embodiment 6:

[0051] The difference between this embodiment and Embodiment 5 is that both ends of the first main beam 14 of the first-level frame are respectively slidably connected to the first sliding brackets 5, and two hinge connectors are installed on the part of the first main beam 14 of the first-level frame between the two first sliding brackets 5. Through the two hinge connectors, they are respectively hinged to one end of the first main beams 25 of the two second-level frames. The other end of the first main beam 25 of the second-level frame is slidably connected to the second sliding brackets 6; both ends of the third main beam 16 of the first-level frame are respectively hinged to one end of the main beams 33 of the two third-level I-shaped frames. The other end of the main beam 33 of the third-level I-shaped frame is slidably connected to one end of the second main beam 26 of the second-level frame. The other end of the second main beam 26 of the second-level frame is hinged to one end of the main beam 43 of the third-level II-shaped frame. The other end of the main beam 43 of the third-level II-shaped frame is slidably connected to the third sliding brackets 7. Embodiment 7:

[0052] The difference between this embodiment and Embodiments 5 and 6 is that the third-level I-shaped frame 3 and the third-level II-shaped frame 4 of this embodiment are both mainly composed of one main beam and the support beams connected to the main beam.

[0053] The above is only the specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. An adaptive arc-changing device for the idler of a belt conveyor, characterized in that , including a frame group composed of a first-level frame, a second-level frame, a third-level type-I frame and a third-level type-II frame, and a sliding support group composed of a first-level sliding support, a second-level sliding support and a third-level sliding support. The first-level frame is respectively connected to the second-level frame and the third-level type-I frame, the third-level type-I frame is connected to the second-level frame, and the second-level frame is connected to the third-level type-II frame. Idler rollers are respectively installed on the first-level frame, the second-level frame, the third-level type-I frame and the third-level type-II frame; The first-level sliding support slidably connected to the first-level frame, the second-level sliding support slidably connected to the second-level frame, and the third-level sliding support slidably connected to the third-level type-II frame are successively fixed on a first girder and a second girder that are connected together and have a variable included angle on a mobile bulk material conveying device; the first-level frame, the second-level frame, the third-level type-I frame and the third-level type-II frame form a multi-segment broken line similar to an arc as the angles of the first girder and the second girder change, so that the idler rollers are arranged along an approximate arc; The first-level frame is composed of a first main beam, a second main beam and a third main beam, and the second-level frame is mainly composed of a first main beam and a second main beam; both ends of the first main beam of the first-level frame are respectively slidably connected to the first-level sliding support, both ends of the second main beam of the first-level frame are respectively hinged to one end of the first main beams of two second-level frames, and the other end of the first main beam of the second-level frame is slidably connected to the second-level sliding support; Both ends of the third main beam of the first-level frame are respectively hinged to one end of the main beams of two third-level type-I frames, the other end of the main beam of the third-level type-I frame is slidably connected to one end of the second main beam of the second-level frame, the other end of the second main beam of the second-level frame is hinged to one end of the main beam of the third-level type-II frame, and the other end of the main beam of the third-level type-II frame is slidably connected to the third-level sliding support.

2. The belt conveyor idler self - adaptive variable - arc device according to claim 1, characterized in that: The first-level frame is composed of a first main beam, a second main beam and a third main beam, and the second-level frame is mainly composed of a first main beam and a second main beam; both ends of the first main beam of the first-level frame are respectively slidably connected to the first-level sliding support, both ends of the second main beam of the first-level frame are respectively hinged to one end of the first main beams of two second-level frames, and the other end of the first main beam of the second-level frame is slidably connected to the second-level sliding support; Both ends of the third main beam of the first-level frame are respectively slidably connected to one end of the main beams of two third-level type-I frames, the other end of the main beam of the third-level type-I frame is hinged to one end of the second main beam of the second-level frame, the other end of the second main beam of the second-level frame is hinged to one end of the main beam of the third-level type-II frame, and the other end of the main beam of the third-level type-II frame is slidably connected to the third-level sliding support.

3. The belt conveyor idler self-adaptive variable arc device according to claim 1 or 2, characterized in that: Both the third-level type-I frame and the third-level type-II frame are mainly composed of a main beam.

4. The belt conveyor idler self-adaptive variable arc device according to claim 1 or 2, characterized in that: Both the third-level type-I frame and the third-level type-II frame are mainly composed of a main beam and a support beam that is connected to the main beam and forms a quadrilateral with the main beam.

5. The idler self-adaptive variable arc device for a belt conveyor according to claim 1, characterized in that: The first-level frame is composed of a first main beam and a third main beam; the second-level frame is mainly composed of a first main beam and a second main beam; Both ends of the first main beam of the first-level frame are respectively slidably connected to the first-level sliding support, and both sides of the inward protruding part of the first main beam of the first-level frame are respectively hinged to one end of the first main beams of two second-level frames, and the other end of the first main beam of the second-level frame is slidably connected to the second-level sliding support; Both ends of the third main beam of the first-level frame are respectively hinged to one end of the main beams of two third-level I-shaped frames. The other end of the main beam of the third-level I-shaped frame is slidably connected to one end of the second main beam of the second-level frame. The other end of the second main beam of the second-level frame is hinged to one end of the third-level II-shaped frame. The other end of the third-level II-shaped frame is slidably connected to a third-level sliding bracket.

6. The belt conveyor idler self-adaptive variable arc device according to claim 1, characterized in that: The first-level frame is composed of a first main beam and a third main beam; the second-level frame is mainly composed of a first main beam and a second main beam; Both ends of the first main beam of the first-level frame are respectively slidably connected to a first-level sliding bracket. The first main beam of the first-level frame is respectively hinged to one end of the first main beams of two second-level frames through two hinge connectors. The other end of the first main beam of the second-level frame is slidably connected to a second-level sliding bracket. Both ends of the third main beam of the first-level frame are respectively hinged to one end of the main beams of two third-level I-shaped frames. The other end of the main beam of the third-level I-shaped frame is slidably connected to one end of the second main beam of the second-level frame. The other end of the second main beam of the second-level frame is hinged to one end of the main beam of the third-level II-shaped frame. The other end of the main beam of the third-level II-shaped frame is slidably connected to a third-level sliding bracket.

7. The belt conveyor idler self-adaptive variable arc device according to claim 5 or 6, characterized in that: Both the third-level I-shaped frame and the third-level II-shaped frame are mainly composed of a main beam.

8. The belt conveyor idler self-adaptive variable arc device according to claim 5 or 6, characterized in that: Both the third-level I-shaped frame and the third-level II-shaped frame are mainly composed of a main beam and a support beam connected to the main beam.

9. The idler self-adaptive variable arc device of the belt conveyor according to claim 1, characterized in that: A guiding device is provided on the first-level frame. The guiding device is sleeved on a shaft coaxial with the hinge shaft between the first main beam and the second main beam through an oblong hole, so that the movement direction of the first-level frame relative to the first main beam and the second main beam remains in the angular bisector direction or the reverse direction of the included angle formed by the first main beam and the second main beam.

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