Wheel track belt conveyor

Abstract

The invention relates to a wheel track belt conveyor, and belongs to the field of conveying facilities. Comprising a carrier roller set, a driving device, an annular rubber belt and a bearing running mechanism, and the bearing running mechanism runs on a track along with the rubber belt; the adhesive tape comprises a bearing section and a return section; the bearing operation mechanism comprises a first supporting device and a second supporting device. When the bearing operation mechanism operates to the bearing section, the first supporting device is lifted towards the annular outer side of the adhesive tape and drives the adhesive tape to be lifted to be in a groove shape so as to bear materials. And when the bearing operation mechanism operates to a return stroke section, the first supporting device falls down to flatly lay the adhesive tape, and the second supporting device horizontally rotates until the second supporting device is attached to the annular outer side of the adhesive tape so as to hold the adhesive tape. The reversing device is in contact with the first supporting device and the second supporting device respectively, so that the two supporting devices rotate to realize bearing and separation of the adhesive tape. The bearing operation mechanism is used for replacing a traditional carrier roller, and the resistance of the middle operation section, the operation energy consumption and the maintenance cost are effectively reduced.

Description

Technical Field

[0001] The invention belongs to the field of conveying facilities and relates to a wheel-rail belt conveyor. Background Art

[0002] As a common material conveying equipment, belt conveyor has the characteristics of reliable operation, low power consumption and strong adaptability. It is widely used in mining, metallurgy, building materials, chemical industry, food and other industries. Belt conveyor can work stably under various environmental conditions, such as high humidity, high temperature or other harsh conditions, and is particularly suitable for occasions that require long-term continuous operation. Whether it is the transportation of raw materials or the transportation of finished products, it can effectively improve production efficiency and reduce labor costs. With its unique structural characteristics and wide range of applications, belt conveyor has become an important part of the modern industrial transportation system. Its high efficiency, reliability and economy have made it widely used and developed in all walks of life.

[0003] The middle section of the traditional belt conveyor mainly uses the method of upper and lower rollers to carry the belt to achieve material transportation. The advantages of this method are simple structure and easy operation, but there are also some problems. For example, due to the large friction between the belt and the rollers, the energy consumption is high, and the maintenance cost of the equipment is increased. As the conveying distance increases, the more rollers are required, the greater the friction will be, which will not only bring more energy consumption, but also increase construction and maintenance costs, and gradually fail to meet the needs of various industries for energy saving and cost reduction.

[0004] In order to solve the problems of high operating energy consumption and high maintenance cost caused by the method of using upper and lower rollers to carry the belt in traditional belt conveyors, as well as the complex structure, large space occupation and easy jamming of the rotating device of the existing wheel-rail belt conveyor, it is necessary to design a new type of belt conveyor. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a wheel-rail belt conveyor that effectively reduces the resistance of the middle running section, as well as the operating energy consumption and maintenance costs.

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

[0007] A wheel-rail belt conveyor comprises an annular belt, wherein a bearing and running mechanism for bearing the belt is arranged in an inner cavity formed by the belt, and the bearing and running mechanism runs together with the belt; and further comprises a track which cooperates with the bearing and running mechanism when the belt is running;

[0008] The adhesive belt comprises a load-bearing section located above the load-bearing running mechanism, and a return section located below the load-bearing running mechanism; the load-bearing running mechanism comprises a first supporting device and a second supporting device, the first supporting device is arranged on the inner side of the ring shape of the adhesive belt, and the second supporting device is arranged on the outer side of the running direction of the adhesive belt;

[0009] When the load-bearing mechanism runs to the load-bearing section, the first supporting device is lifted toward the outer side of the ring of the belt and drives the belt to be lifted into a groove shape to carry materials; when the load-bearing mechanism runs to the return section, the first supporting device falls to make the belt flat, and the second supporting device rotates horizontally until it fits with the outer side of the ring of the belt to hold the belt.

[0010] Optionally, the load-bearing running device further includes a wheel bridge and wheel groups arranged at both ends of the wheel bridge, and the wheel groups run along the track; the first supporting device and the second supporting device are both arranged on the wheel bridge.

[0011] Optionally, the first supporting device includes a first supporting frame and a first supporting leg, the first supporting frame is located on a side of the wheel bridge close to the belt, the first supporting leg is located on the other side of the wheel bridge, the first supporting frame and the first supporting leg are arranged on the wheel bridge in a vertically rotatable manner through an angle adjustment unit, and the relative positions of the first supporting frame and the first supporting leg are fixed;

[0012] The second supporting device includes a second supporting frame and a second supporting leg which are connected to each other at a certain angle, and is horizontally rotatably arranged on the wheel bridge through a torsion spring and a bearing at the connection between the second supporting frame and the second supporting leg; wherein the second supporting frame is located on the side of the wheel bridge close to the belt, and the second supporting leg is located on the other side of the wheel bridge.

[0013] Optionally, two of the first supporting devices and the second supporting devices are arranged side by side and symmetrically along the width direction of the tape.

[0014] Optionally, it also includes a reversing device arranged between the load-bearing section and the return section, a first reversing wheel is arranged on the first support leg, and a second reversing wheel is arranged on the second support leg, the first reversing wheel and the second reversing wheel respectively rotate after contacting the reversing device, and drive the vertical rotation of the first support leg and the horizontal rotation of the second support leg.

[0015] Optionally, a bracket is arranged between the tracks of the load-bearing section and the return section, and the reversing device is arranged on the bracket; the reversing device includes a first stop block and a second stop block; the first stop block is arranged on a side of the bracket close to the load-bearing section, and an upper surface of the first stop block is inclined from low to high along the running direction of the belt; when the first supporting device runs to the load-bearing section, after the first reversing wheel contacts the first stop block, as the belt continues to run, the first reversing wheel climbs on the upper surface of the first stop block, and the first supporting device rotates around the angle adjustment unit until the first supporting frame is lifted to a fixed angle, and the angle adjustment unit locks the first supporting device, and the first reversing wheel disengages from the first stop block; the second stop block is arranged on a side of the bracket close to the return section, and one of the side surfaces of the second stop block is arranged to be an inclined surface at a certain angle to the running direction of the belt; when the second supporting device runs to the return section, the second reversing wheel contacts the side surface of the second stop block, so that the second supporting leg rotates around the torsion spring, and drives the second supporting frame to rotate until the belt is caught.

[0016] Optionally, a tensioning device is provided on the return section to tension the adhesive belt.

[0017] Optionally, the tensioning device adopts a weight tensioning type, and a reversing device is provided on both sides of the tensioning device along the running direction of the belt; the belt first passes through the reversing device to disengage the second support frame, then passes through the tensioning device for tensioning, and then passes through the reversing device again to rotate the second support frame until the belt is caught again.

[0018] Optionally, at least two of the bearing and running mechanisms are arranged along the running direction of the belt, and adjacent bearing and running mechanisms are connected by a connecting chain.

[0019] Optionally, the track located in the load-bearing section and the track located in the return section are connected via a rotating device at both ends thereof.

[0020] The beneficial effects of the present invention are:

[0021] The wheel-rail belt conveyor of the present invention adopts a load-bearing running mechanism to replace the traditional upper and lower rollers to carry the operation of the belt and the transportation of materials, effectively reducing the operation resistance, reducing energy consumption, and saving construction and operation costs. Since the operation resistance is reduced, the friction between the rollers and the belt is reduced, thereby reducing the wear of the equipment, reducing the maintenance cost of the equipment, and realizing efficient operation and low-cost maintenance of the equipment.

[0022] The load-bearing and running mechanism of the present invention is composed of a wheel group, a first supporting device that can rotate vertically, and a second supporting device that can rotate horizontally. The first supporting device contains an angle control unit to realize the angle adjustment and support of the load-bearing and running mechanism; the second supporting device contains a torsion spring. When the second supporting leg contacts the reversing device, the second supporting frame holds the tape, and when the second supporting leg is disengaged from the reversing device, the second supporting frame is away from the tape, thereby improving the stability and flexibility of the equipment, simplifying the structure of the equipment, and reducing the failure rate and maintenance difficulty of the equipment.

[0023] The present invention also adopts a simple and reliable slewing device and reversing device, which can realize the continuous slewing, rotation and angle adjustment of the belt carrying running mechanism, thereby improving the operating efficiency and stability of the equipment; the slewing device can well solve the problems of complex structure and large space occupation of the existing wheel-rail belt conveyor slewing device.

[0024] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 It is a front view of the belt conveyor of the present invention;

[0027] Figure 2 is a cross-sectional view of the belt conveyor of the present invention;

[0028] Figure 3 It is a cross-sectional view of the load-bearing running mechanism;

[0029] Figure 4 for Figure 1 Enlarged view of the middle A area;

[0030] Figure 5 It is a plan view schematically showing the contact process between the second supporting device and the second stopper.

[0031] Reference numerals:

[0032] 1 tail assembly device, 2 tensioning device, 3 roller group, 4 rotating device, 5 load-bearing running mechanism, 6 connecting chain, 7 track, 8 belt, 81 load-bearing section, 82 return section, 9 bracket, 10 support leg, 11 reversing device, 111 first block, 112 second block, 12 driving device, 13 first supporting device, 131 first supporting frame, 132 first supporting leg, 133 first reversing wheel, 134 angle adjustment unit, 14 second supporting device, 141 second supporting frame, 142 second supporting leg, 143 second reversing wheel, 15 wheel group, 16 wheel bridge. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] See also Figure 1 to Figure 5, is a wheel-rail belt conveyor, comprising a roller group 3 and a driving device 12 arranged relatively to each other, and an annular belt 8 surrounding the roller group 3 and the driving device 12; a carrying and running mechanism 5 for carrying the belt 8 is arranged in the internal cavity formed by the belt 8, and the carrying and running mechanism 5 runs together with the belt 8; and also includes a track 7 that cooperates with the carrying and running mechanism 5 when running. A tail assembly device 1 is also arranged on the side of the roller group 3 away from the driving device 12, which is used to cooperate with the belt 8 to run.

[0037] The belt 8 includes a bearing section 81 located above the bearing mechanism 5 and a return section 82 located below the bearing mechanism 5; the bearing mechanism 5 includes a first supporting device 13 and a second supporting device 14, the first supporting device 13 is arranged on the inner side of the ring of the belt 8, and the second supporting device 14 is arranged on the outer side of the running direction of the belt 8. The bearing mechanism also includes a wheel bridge 16 and a wheel set 15 arranged at both ends of the wheel bridge 16, and the wheel set 15 runs along the track 7; the first supporting device 13 and the second supporting device 14 are both arranged on the wheel bridge 16.

[0038] The wheel set 15 may be composed of one or more wheels on one side. The wheel set 15 is installed on the wheel bridge 16 by welding, bolts, etc., and finally combined to form the load-bearing running mechanism 5.

[0039] A bracket 9 is provided between the rails 7 of the bearing section 81 and the return section 82 , and a support leg 10 is provided on the bracket 9 .

[0040] Several load-bearing and running mechanisms 5 are arranged along the running direction of the belt 8. Adjacent load-bearing and running mechanisms 5 are connected by connecting chains 6 so that adjacent mechanisms do not collide with each other, thus ensuring the smooth and safe operation of the load-bearing and running mechanisms 5. The load-bearing and running mechanisms 5 replace the traditional roller group 3 to realize the load-bearing and disengagement of the belt 8 in the load-bearing section 81 and the return section 82, thereby reducing friction and energy consumption. The installation position of the load-bearing and running mechanisms 5 can be adjusted according to the specific position of the track 7 to realize different belt surface heights, which is also convenient for on-site installation.

[0041] The track 7 located in the load-bearing section 81 and the track 7 located in the return section 82 are connected through the rotating devices 4 at both ends thereof. A continuous upper and lower combined rotating track 7 is adopted and installed on the bracket 9 by welding, bolts, etc. The load-bearing running mechanism 5 is in contact with the rotating device 4 to realize continuous rotation of the load-bearing running mechanism 5.

[0042] The track 7 is in the form of an upper and lower combination at the position of the rotating device 4 or the entire length, which is conducive to the wheel set 15 walking along the predetermined track, facilitating the disengagement and loading of the belt 8, so as to realize the continuous operation and rotation of the carrying running mechanism 5.

[0043] The first support device 13 includes a first support frame 131 and a first support leg 132. The first support frame 131 is located on one side of the wheel bridge 16 close to the belt 8, and the first support leg 132 is located on the other side of the wheel bridge 16. The first support frame 131 and the first support leg 132 are arranged on the wheel bridge 16 in a vertically rotating form through an angle adjustment unit 134, and the relative positions of the first support frame 131 and the first support leg 132 are fixed; the second support device 14 includes a second support frame 141 and a second support leg 142 connected to each other at a certain angle, and the connection between the two is arranged on the wheel bridge 16 in a horizontally rotating manner through a torsion spring and a bearing; wherein the second support frame 141 is located on one side of the wheel bridge 16 close to the belt 8, and the second support leg 142 is located on the other side of the wheel bridge 16. The angle adjustment unit 134 can realize the angle adjustment and locking of the first support frame 131, replacing the traditional upper roller, for carrying and disengaging the belt 8. The second support device 14 rotates to realize the carrying of the return belt 8 section, replacing the traditional lower roller.

[0044] Two first supporting devices 13 are arranged side by side and symmetrically along the width direction of the adhesive tape 8 .

[0045] When the load-bearing mechanism 5 runs to the load-bearing section 81, the first support frame 131 is lifted toward the annular outer side of the tape 8 and drives the tape 8 to be lifted into a groove shape to carry the material; when the load-bearing mechanism 5 runs to the return section 82, the first support frame 131 falls to make the tape 8 flat, and the second support device 14 rotates horizontally until the second support frame 141 is in contact with the annular outer side of the tape 8 to hold the tape 8.

[0046] The wheel-rail belt conveyor also includes a reversing device 11 arranged between the load-bearing section 81 and the return section 82. A first reversing wheel 133 is arranged on the first supporting leg 132, and a second reversing wheel 143 is arranged on the second supporting leg 142. The first reversing wheel 133 and the second reversing wheel 143 respectively rotate after contacting the reversing device 11, and drive the vertical rotation of the first supporting leg 132 and the horizontal rotation of the second supporting leg 142 to achieve the angle adjustment of the first supporting device 13, disengage and accommodate the belt 8 of the load-bearing section 81; realize the rotation of the second supporting device 14, which is used to disengage and support the belt 8 of the return section 82.

[0047] The reversing device 11 is installed on the bracket 9 by welding, bolts, etc.; the reversing device 11 includes a first stopper 111 and a second stopper 112; the first stopper 111 is arranged on the side of the bracket 9 close to the bearing section 81, and the upper surface of the first stopper 111 is inclined from low to high along the running direction of the belt 8; when the first supporting device 13 runs to the bearing section 81, after the first reversing wheel 133 contacts the first stopper 111, as the belt 8 continues to run, the first reversing wheel 133 climbs on the upper surface of the first stopper 111, and the first supporting device 13 rotates around the angle adjustment unit 134 to The first support frame 131 is lifted to a fixed angle, the angle adjustment unit 134 locks the first support device 13, and the first reversing wheel 133 disengages from the first block 111; the second block 112 is arranged on the side of the bracket 9 close to the return section 82, and one of the side surfaces of the second block 112 is arranged as an inclined surface at a certain angle to the running direction of the tape 8; when the second support device 14 runs to the return section 82, the second reversing wheel 143 contacts the side surface of the second block 112, so that the second support leg 142 rotates around the torsion spring, and drives the second support frame 141 to rotate until the tape 8 is caught.

[0048] The return section 82 is provided with a tensioning device 2 to tension the adhesive tape 8. When the tensioning device 2 adopts a weight tensioning type, a reversing device 11 is provided on both sides of the tensioning device 2 along the running direction of the adhesive tape 8. The adhesive tape 8 first passes through the reversing device 11 to disengage the second support frame 141, then passes through the tensioning device 2 for tensioning, and then passes through the reversing device 11 again to rotate the second support frame 141 until the adhesive tape 8 is caught again.

[0049] The operation process of the wheel-rail belt conveyor of the present invention:

[0050] The driving device 12 drives the adhesive tape 8, and the adhesive tape 8 in the area of ​​the tail assembly device 1 is formed under the action of the roller group 3. Under the action of the rotating device 4 and the reversing device 11 at the tail assembly device 1, the angle of the first support frame 131 of the first support device 13 is gradually adjusted, and after entering a fixed angle, it is locked at a fixed angle by the angle control unit; the second support frame 141 of the second support device 14 is gradually rotated to disengage the adhesive tape 8. At this time, the carrying and operating mechanism 5 enters the carrying section 81 from the return section 82 of the adhesive tape 8. The adhesive tape 8 drives the carrying and operating mechanism 5 to run together on the track 7 to the area close to the driving device 12. Under the action of the rotating device 4 and the reversing device 11 near the driving device 12, the angle of the first support frame 131 of the first support device 13 is gradually retracted; the second support frame 141 of the second support device 14 is gradually rotated to carry the adhesive tape 8. At this time, the carrying and operating mechanism 5 enters the return section 82 from the carrying section 81 of the adhesive tape 8. Through the above-mentioned continuous rotary operation, the continuous operation of the new wheel-rail belt conveyor is realized, and the rapid and continuous transportation of materials is completed.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A wheel-rail belt conveyor, characterized in that: It comprises an annular adhesive tape (8), wherein an internal cavity formed by the adhesive tape (8) is provided with a carrying and operating mechanism (5) for carrying the adhesive tape (8), and the carrying and operating mechanism (5) runs together with the adhesive tape (8); and it also comprises a track (7) that cooperates with the carrying and operating mechanism (5) when it runs; The adhesive belt (8) comprises a load-bearing section (81) located above the load-bearing running mechanism (5), and a return section (82) located below the load-bearing running mechanism (5); the load-bearing running mechanism (5) comprises a first supporting device (13) and a second supporting device (14), wherein the first supporting device (13) is arranged on the inner side of the ring shape of the adhesive belt (8), and the second supporting device (14) is arranged on the outer side of the running direction of the adhesive belt (8); When the load-bearing running mechanism (5) runs to the load-bearing section (81), the first supporting device (13) is lifted toward the annular outer side of the adhesive tape (8) and drives the adhesive tape (8) to be lifted into a groove shape to carry materials; when the load-bearing running mechanism (5) runs to the return section (82), the first supporting device (13) falls to make the adhesive tape (8) flat, and the second supporting device (14) rotates horizontally until it fits with the annular outer side of the adhesive tape (8) to hold the adhesive tape (8).

2. The wheel-rail belt conveyor according to claim 1, characterized in that: The load-bearing running device also includes a wheel bridge (16) and wheel groups (15) arranged at both ends of the wheel bridge (16), and the wheel groups (15) run along the track (7); the first supporting device (13) and the second supporting device (14) are both arranged on the wheel bridge (16).

3. The wheel-rail belt conveyor according to claim 2, characterized in that: The first supporting device (13) comprises a first supporting frame (131) and a first supporting leg (132); the first supporting frame (131) is located on one side of the wheel bridge (16) close to the adhesive tape (8); the first supporting leg (132) is located on the other side of the wheel bridge (16); the first supporting frame (131) and the first supporting leg (132) are arranged on the wheel bridge (16) in a vertically rotatable manner via an angle adjustment unit (134); and the relative positions of the first supporting frame (131) and the first supporting leg (132) are fixed; The second supporting device (14) comprises a second supporting frame (141) and a second supporting leg (142) which are connected to each other at a certain angle, and are horizontally rotatably arranged on the wheel bridge (16) through a torsion spring and a bearing at the connection between the second supporting frame (141); wherein the second supporting frame (141) is located on one side of the wheel bridge (16) close to the belt (8), and the second supporting leg (142) is located on the other side of the wheel bridge (16).

4. The wheel-rail belt conveyor according to claim 3, characterized in that: The first supporting device (13) and the second supporting device (13) are both arranged side by side and symmetrically in two along the width direction of the adhesive tape (8).

5. The wheel-rail belt conveyor according to claim 3, characterized in that: The invention also comprises a reversing device (11) arranged between the bearing section (81) and the return section (82); a first reversing wheel (133) is arranged on the first supporting leg (132); a second reversing wheel (143) is arranged on the second supporting leg (142); the first reversing wheel (133) and the second reversing wheel (143) respectively contact the reversing device (11) and then rotate, thereby driving the vertical rotation of the first supporting leg (132) and the horizontal rotation of the second supporting leg (142).

6. The wheel-rail belt conveyor according to claim 5, characterized in that: A bracket (9) is arranged between the rails (7) of the bearing section (81) and the return section (82), and the reversing device (11) is arranged on the bracket (9); the reversing device (11) comprises a first stopper (111) and a second stopper (112); the first stopper (111) is arranged on a side of the bracket (9) close to the bearing section (81), and the upper surface of the first stopper (111) is inclined from low to high along the running direction of the adhesive belt (8); when the first supporting device (13) runs to the bearing section (81), after the first reversing wheel (133) contacts the first stopper (111), as the adhesive belt (8) continues to run, the first reversing wheel (133) climbs on the upper surface of the first stopper (111), and the first supporting device (13) is moved upward. (13) rotates around the angle adjustment unit (134) until the first support frame (131) is lifted to a fixed angle, the angle adjustment unit (134) locks the first support device (13), and the first reversing wheel (133) disengages from the first block (111); the second block (112) is arranged on the side of the bracket (9) close to the return section (82), and one of the side surfaces of the second block (112) is arranged to be an inclined surface at a certain angle to the running direction of the tape (8); when the second support device (14) runs to the return section (82), the second reversing wheel (143) contacts the side surface of the second block (112), so that the second support leg (142) rotates around the torsion spring, and drives the second support frame (141) to rotate until the tape (8) is caught.

7. The wheel-rail belt conveyor according to claim 5, characterized in that: The return section (82) is provided with a tensioning device (2) to tension the adhesive belt (8).

8. The wheel-rail belt conveyor according to claim 7, characterized in that: The tensioning device (2) adopts a heavy hammer tensioning type, and along the running direction of the adhesive belt (8), a reversing device (11) is respectively arranged on both sides of the tensioning device (2).

9. The wheel-rail belt conveyor according to claim 1, characterized in that: At least two of the load-bearing and running mechanisms (5) are arranged along the running direction of the adhesive belt (8), and adjacent load-bearing and running mechanisms (5) are connected via a connecting chain (6).

10. The wheel-rail belt conveyor according to claim 1, characterized in that: The track (7) located in the bearing section (81) and the track (7) located in the return section (82) are connected via the rotating devices (4) at both ends thereof.

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