Telescopic conveyor

Abstract

The telescopic conveyor comprises a base, a telescopic conveying arm hinged to the base around the horizontal axis and a conveying belt assembly used for conveying materials, the telescopic conveying arm comprises a large conveying arm and a small telescopic arm which slide relatively, and the telescopic conveying arm is hinged to the base through the near end of the large conveying arm; the conveying belt assembly comprises two pairs of guide wheels arranged at the two ends of the large conveying arm, two reversing wheels arranged at the two ends of the small telescopic arm and a closed-loop conveying belt surrounding the guide wheels, the two pairs of guide wheels are located at the two ends of the large conveying arm respectively, and part of the conveying belt between the two far-end guide wheels sequentially bypasses the two reversing wheels in a turn-back mode. The two reversing wheels are located at the two ends of the small telescopic arm correspondingly, and when the small conveying arm slides relative to the large conveying arm, the two sections of conveying belts between the two reversing wheels and the two far-end guide wheels extend or retract correspondingly. The telescopic conveying arm can stretch out and draw back to adjust the material conveying distance and can also be conveniently shortened, stored and transferred, and operation of using, transporting and storing is simplified.

Description

Technical Field

[0001] The utility model relates to the field of cigarette package transportation, in particular to a telescopic conveyor. Background Art

[0002] Tobacco leaf purchasing stations need to use cigarette bale conveyors to transport, move or lift cigarette bales during the purchase of tobacco leaves. However, the conveyor arms currently used are of fixed size, and the specifications of the conveyor cantilever are 6 to 13 meters, which can meet the needs of long-distance transportation. However, equipment with a cantilever length of more than 10 meters is difficult to transport and transfer. During transportation, it may be necessary to disassemble it into two sections in the middle and then lift and assemble it when it is transported to the site.

[0003] However, the repeated disassembly and assembly process is relatively complicated, and it is difficult to carry out hoisting operations in remote areas, making installation extremely inconvenient. In addition, when the conveyor is stored, due to site limitations, the conveyor with a long cantilever needs to be disassembled again, resulting in inconvenience in the storage and retrieval process. Therefore, there is a need for a conveying equipment that can meet the functional requirements of long-distance transportation and is convenient for transportation and storage. Utility Model Content

[0004] The utility model solves the problem that a conveying device that can meet the functional requirements of long-distance conveying and is convenient for transportation and storage is needed. A telescopic conveyor is provided to solve the technical problem. The telescopic conveying arm is configured as a sliding-matching conveying arm and a telescopic arm. During the sliding of the telescopic arm, the conveyor belt between the guide wheel and the reversing wheel is extended and retracted, which can change the length of the closed-loop conveyor belt in the direction away from the material stacking platform, thereby adjusting the material conveying distance of the conveyor to meet the use requirements of long-distance conveying. When the conveyor needs to be stored, the telescopic arm can be controlled to retract.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A telescopic conveyor comprises a base, a telescopic conveying arm hinged to the base around a horizontal axis, and a conveyor belt assembly for conveying materials, wherein:

[0007] The end of the telescopic conveying arm close to the hinge position is defined as the proximal end, and the end away from the hinge position is defined as the distal end. The telescopic conveying arm includes a relatively sliding conveying arm and a telescopic small arm. The telescopic conveying arm is hinged to the base through the proximal end of the conveying arm, and a rotating drive component for driving the conveying arm to rotate is also connected between the conveying arm and the base. The telescopic small arm slides in a controlled manner along the length direction of the conveying arm.

[0008] The conveyor belt assembly includes two pairs of guide wheels respectively arranged at the two ends of the conveying boom, two reversing wheels arranged at the two ends of the telescopic arm, and a closed-loop conveyor belt surrounding each guide wheel. The two pairs of guide wheels are respectively located at the two ends of the conveying boom, and the two pairs of guide wheels are distributed in a rectangular array. The pair of guide wheels at the far end of the conveying boom is defined as the far end guide wheel. The part of the conveyor belt located between the two far end guide wheels sequentially bypasses the two reversing wheels in the form of a return. The two reversing wheels are respectively located at the two ends of the telescopic arm, and the plane determined by the axes of the two reversing wheels is located between the two far end guide wheels. The two reversing wheels are respectively located on the inner side and the outer side of the conveyor belt. When the conveying arm slides relative to the conveying boom, the two sections of the conveyor belt between the two reversing wheels and the two far end guide wheels are respectively extended or shortened.

[0009] With one of the guide wheels as a driving wheel, the telescopic conveyor also includes a main driving mechanism for driving the driving wheel to rotate, a telescopic driving mechanism for driving the telescopic small arm to slide back and forth relative to the conveying large arm, and a power source for providing energy to the main driving mechanism and the telescopic driving mechanism. The main driving mechanism and the telescopic driving mechanism are connected to the power source through a reversing switch / reversing valve, and the main driving mechanism and the telescopic driving mechanism are respectively connected to different terminals of the reversing switch or respectively connected to different outlets of the reversing valve.

[0010] Preferably, the rotary drive assembly is a cylinder, a hydraulic cylinder or a screw module, and the two parts of the rotary drive assembly that move relatively to each other are respectively hinged to the conveying arm and the base, the hinge axes are parallel to the rotation axis of the conveying arm, and the direction of the force exerted by the rotary drive assembly on the conveying arm is not coplanar with the rotation axis of the conveying arm.

[0011] Preferably, the portion of the conveyor belt located between the two distal guide wheels is named a return conveyor belt. When the conveyor belt moves to transport materials using the portion of the conveyor belt with the outer side facing upward, the return conveyor belt passes through the reversing wheel at the distal end of the telescopic arm and the reversing wheel at the proximal end of the telescopic arm in sequence.

[0012] Preferably, the telescopic arm is further provided with a secondary driving mechanism for driving a reversing wheel at the proximal end of the telescopic arm to rotate, and during the process of conveying materials by the conveyor belt, the rotational linear speed of the reversing wheel at the proximal end of the telescopic arm is not lower than the moving speed of the conveyor belt; or

[0013] The telescopic arm is provided with a sliding seat which slides along its length direction and an elastic member which drives the sliding seat to slide in a direction away from the far end of the telescopic arm. The reversing wheel at the proximal end of the telescopic arm is rotatably connected to the sliding seat.

[0014] Preferably, the conveying arm further comprises a side plate for mounting each guide wheel, the side plate being fixedly connected with a guide rail for guiding the sliding of the telescopic arm, and the telescopic arm is slidably arranged on the guide rail.

[0015] Preferably, a material stacking platform is further provided at one end of the top surface of the base, the power source is arranged below the material stacking platform, the proximal end of the telescopic conveying arm is arranged close to the material platform, and the driving wheel is a guide wheel located at the proximal end of the conveying arm.

[0016] Preferably, universal wheels are respectively provided at the four corners of the bottom surface of the base.

[0017] Beneficial technical effects of the technical solution of the utility model:

[0018] (1) A telescopic arm is slidably installed on the conveying arm, and the two ends of the conveying arm are respectively rotatably connected to a pair of guide wheels, and a closed-loop conveyor belt is arranged around the guide wheels. The part of the conveyor belt with the outer side facing upward can be used to convey materials. Reversing wheels are installed at both ends of the telescopic arm. The part of the conveyor belt between the two distal guide wheels bypasses the two reversing wheels in turn in the form of a return, and in the process of sliding of the telescopic arm, the two sections of the conveyor belt between the two guide wheels and the two reversing wheels are respectively extended and shortened. The part of the return conveyor belt protruding from the distal end of the conveying arm and with the outer side facing upward can also be used to convey materials. When the length of the telescopic arm sliding out of the distal end of the conveying arm is increased, the overall length of the telescopic conveyor arm can be extended, and at the same time, the overall length of the conveyor belt with the outer side facing upward is increased, thereby extending the material conveying distance of the conveyor to meet the use requirements of long-distance transportation. When the conveyor needs to be stored, the telescopic arm can be controlled to retract, which simplifies the operation of use, transportation and storage.

[0019] The main drive mechanism and the telescopic drive mechanism do not operate at the same time. When the power source supplies energy to the main drive mechanism, the telescopic conveyor arm extends, but the power source cannot supply energy to the telescopic drive mechanism at this time, and the conveyor belt stops moving. After the telescopic conveyor arm extends to the set length and the conveyor belt remains tensioned, the main drive mechanism is switched to operate, and the conveyor belt can continue to move. This can improve safety in use, avoid the conveyor belt from moving while the telescopic conveyor arm is extending and retracting, and reduce the problem of the conveyor belt loosening and falling off.

[0020] (ii) The reversing wheel at the near end of the telescopic arm is equipped with a secondary drive mechanism, which can keep the conveyor belt used to convey materials taut, ensure smooth material feeding, and reduce the occurrence of slipping problems. Using elastic parts to drive the reversing wheel at the near end of the telescopic arm away from the reversing wheel at the far end of the telescopic arm can promote the overall tension of the conveyor belt, reduce the problem of the conveyor belt loosening when the telescopic conveyor is working, and ensure that the conveyor belt can move smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure diagram of the telescopic conveyor in the embodiment of the utility model is shown;

[0022] Figure 2A structural schematic diagram showing a telescopic conveying arm in a lifted state in an embodiment of the utility model is shown.

[0023] Markings in the accompanying drawings:

[0024] 1-base; 11-universal wheel; 12-material stacking platform; 13-power source; 14-rotation drive assembly; 2-conveying arm; 21-guide wheel; 211-proximal guide wheel; 212-distal guide wheel; 22-main drive mechanism; 23-guide rail; 3-telescopic arm; 31-reversing wheel; 32-auxiliary drive mechanism; 33-telescopic drive mechanism; 4-conveyor belt. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the following is a further detailed description of a telescopic conveyor proposed by the utility model in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the drawings in this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so it has no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model.

[0026] In order to more clearly describe the telescopic conveyor, the present invention defines the terms "proximal end" and "distal end" for the telescopic conveyor arm. Specifically, the "proximal end" refers to the end close to the hinged position of the telescopic conveyor arm and the base; the "distal end" refers to the end far away from the hinged position of the telescopic conveyor arm and the base. Figure 1 Taking the telescopic conveying arm of as an example, the proximal end of the telescopic conveying arm is located on the left side, and the distal end of the telescopic conveying arm is located on the right side.

[0027] The following will be combined with the attached Figure 1 and 2 The technical solution of the telescopic conveyor of the utility model is described in detail with specific embodiments.

[0028] Example

[0029] like Figure 1 and 2As shown, a telescopic conveyor of this embodiment includes a horizontal base 1, and a universal wheel 11 is installed at each of the four corners of the bottom surface of the base 1 for easy transfer. The top surface of the base 1 is provided with a material stacking platform 12 for stacking materials to be transported and a telescopic conveying arm that can be telescopic. The telescopic conveying arm includes a conveying arm 2 rotatably connected to the base 1 and a telescopic arm 3 slidably matched with the conveying arm 2. The length directions of the conveying arm 2 and the telescopic arm 3 are parallel to the length direction of the telescopic conveying arm.

[0030] The proximal end of the conveying arm 2 is adjacent to the material stacking platform 12 and is hinged to the base 1. The hinge axis between the conveying arm 2 and the base 1 is a horizontal axis, that is, the telescopic conveying arm is rotatably connected to the base 1 through the conveying arm 2. A rotary drive assembly 14 for driving the conveying arm 2 to rotate is also installed between the conveying arm 2 and the base 1. By driving the conveying arm 2 to rotate, the overall inclination of the telescopic conveying arm can be adjusted, and the lifting height and feeding distance of the material supply can be changed. The two relatively moving parts of the rotary drive assembly 14 are respectively hinged to the conveying arm 2 and the base 1, and the hinge axis is parallel to the rotation axis of the conveying arm 2. It should also be noted that the direction of the force exerted by the rotary drive component 14 on the conveying arm 2 is not coplanar with the rotation axis of the conveying arm 2, so as to avoid jamming the conveying arm 2 and causing the rotary drive component 14 to be unable to extend. The rotary drive component 14 can specifically be a cylinder, a hydraulic cylinder, a screw module or other linear drive equipment. In this embodiment, a hydraulic cylinder is selected as the rotary drive component 14, and the axis of the hydraulic cylinder is not coplanar with the rotation axis of the conveying arm 2. The straight line on which the axis of the hydraulic cylinder is located is above the rotation axis of the conveying arm 2.

[0031] Specifically, the conveying arm 2 includes an integrally formed bottom plate and side plates, the plate surface of the side plates is parallel to the rotation axis of the conveying arm 2, the length direction of the bottom plate and the side plates are parallel to the length direction of the conveying arm 2, and the conveying arm 2 is hinged to the base 1 and the rotary drive assembly 14 through the bottom plate. The telescopic conveying arm is also equipped with a conveyor belt assembly for conveying materials, which includes two pairs of guide wheels 21 rotatably connected to the side plates of the conveying arm 2, two reversing wheels 31 rotatably connected to the telescopic arm 3, and a closed-loop conveyor belt 4 surrounding each guide wheel 21, and the rotation axes of the above-mentioned four guide wheels 21 and the two reversing wheels 31 are parallel to the rotation axis of the conveying arm 2.

[0032] Two pairs of guide wheels 21 are respectively located at the proximal end and the distal end of the conveying boom 2, and the two pairs of guide wheels 21 are arranged side by side along the length direction of the conveying boom 2, and the two guide wheels 21 of the same pair are arranged side by side along the width direction of the side plate, and the axes of the four guide wheels 21 are distributed in the form of a rectangular array. The side plate of the conveying boom 2 is also welded with a guide rail 23 for guiding the sliding of the telescopic arm 3, and the guide rail 23 is parallel to the length direction of the conveying boom 2. The telescopic arm 3 slides along the guide rail 23, that is, the sliding direction of the telescopic arm 3 is also parallel to the length direction of the conveying boom 2. Two reversing wheels 31 are respectively rotatably connected to the proximal end and the distal end of the telescopic arm 3, and the parallel direction of the two reversing wheels 31 is parallel to the sliding direction of the telescopic arm 3, and the plane determined by the axes of the two reversing wheels 31 is located between the two distal guide wheels 212.

[0033] The four guide wheels 21 on the conveying arm 2 are all located on the inner side of the conveying belt 4. The pair of guide wheels 21 located at the proximal end of the conveying arm 2 is named as the proximal guide wheel 211, the pair of guide wheels 21 located at the distal end of the conveying arm 2 is named as the distal guide wheel 212, and the part of the conveying belt 4 located between the distal guide wheels 212 is named as the return conveying belt 4. The return conveying belt 4 bypasses the two reversing wheels 31 in turn in the form of a reversal. The reversing wheel 31 at the distal end of the telescopic arm 3 is located on the inner side of the conveying belt 4, and the reversing wheel 31 at the proximal end of the telescopic arm 3 is located on the outer side of the conveying belt 4. The inner side of the conveying belt 4 referred to in this embodiment specifically refers to the side of the closed-loop conveying belt 4 facing the inner side of the closed loop, and the outer side of the conveying belt 4 specifically refers to the side of the closed-loop conveying belt 4 facing the outer side of the closed loop.

[0034] When the conveyor belt 4 moves, the part of the conveyor belt 4 with the outer side facing upward can be used as a feeding conveyor belt to feed materials. In the process of feeding materials, the return conveyor belt 4 first moves from the higher distal guide wheel 212 to the reversing wheel 31 at the distal end of the telescopic arm 3, then turns back and bypasses the reversing wheel 31 at the proximal end of the telescopic arm 3, and finally reaches the lower distal guide wheel 212. It should be understood that the outer side of the return conveyor belt 4 between the higher distal guide wheel 212 and the reversing wheel 31 at the distal end of the telescopic arm 3 remains upward, so this part of the return conveyor belt 4 is also part of the feeding conveyor belt, and by controlling the reciprocating sliding of the telescopic arm 3 to extend or shorten the telescopic conveyor arm as a whole, the length of the part of the return conveyor belt 4 between the higher distal guide wheel 212 and the reversing wheel 31 at the distal end of the telescopic arm 3 can be adjusted. When the telescopic arm 3 slides away from the proximal end of the conveying arm 2, the overall length of the conveyor belt 4 along the length direction of the telescopic conveying arm can be gradually increased, which is equivalent to extending the overall length of the feeding conveyor belt, increasing the material conveying distance of the telescopic conveyor, and meeting the use requirements of long-distance material conveying. When the conveyor needs to be stored, there is no need to disassemble or assemble, and the telescopic arm 3 is directly controlled to retract, and the length of the conveyor is correspondingly reduced, which can be conveniently transported and transferred, simplifying the operation of use, transportation and storage.

[0035] During the sliding of the telescopic arm 3, the two sections of the conveyor belt 4 located between the two distal guide wheels 212 and the two reversing wheels 31 are extended and shortened respectively, and cannot be extended or shortened at the same time, so as to ensure that the closed-loop conveyor belt 4 will not break or loosen. Therefore, the reversing wheels 31 and the distal guide wheels 212 in this embodiment are configured as follows:

[0036] The diameter of the reversing wheel 31 is the same as that of the distal guide wheel 212. The rotation axes of the two distal guide wheels 212 define a dividing interface. During the sliding of the telescopic arm 3, the axes of the two reversing wheels 31 at the proximal and distal ends of the telescopic arm 3 are always located on both sides of the dividing interface respectively.

[0037] In this embodiment, the proximal guide wheel 211 at a lower position is used as the driving wheel, and a main driving mechanism 22 for driving the driving wheel to rotate is installed on the conveying arm 2. In addition, the conveying arm 2 is also equipped with a telescopic driving mechanism 33 for driving the telescopic arm 3 to slide back and forth. The main driving mechanism 22 and the telescopic driving mechanism 33 are connected to the same power source 13 through a reversing switch or a reversing valve, and the main driving mechanism 22 and the telescopic driving mechanism 33 are respectively connected to different terminals of the reversing switch or different outlets of the reversing valve.

[0038] For example, the main drive mechanism 22 uses a hydraulic motor connected to the driving wheel transmission, the telescopic drive mechanism 33 is a hydraulic cylinder, and the corresponding power source 13 is configured as a hydraulic source. The output pipeline of the hydraulic source connects the hydraulic motor and the hydraulic cylinder through different outlets of the reversing valve. The hydraulic motor and the hydraulic cylinder are in a parallel relationship. The reversing valve is controlled to switch the flow direction of the hydraulic medium, so that the main drive mechanism 22 and the telescopic drive mechanism 33 can be operated separately to avoid the conveyor belt 4 from moving while the telescopic conveyor arm is retracted. When the telescopic conveyor arm is extended, the conveyor belt 4 stops moving. After the telescopic conveyor arm is extended to the set length, the flow direction of the hydraulic medium is switched by the hydraulic valve, and the conveyor belt 4 can continue to move, ensuring that the conveyor belt 4 is in a tensioned state when it moves, which can improve the safety of use, avoid the simultaneous movement of the conveyor belt 4 and the telescopic conveyor arm, and reduce the problem of loosening and falling of the conveyor belt 4.

[0039] In addition, the main drive mechanism 22 can also use an electric motor connected to the driving wheel transmission, and the telescopic drive mechanism 33 is a linear motor. The corresponding power source 13 is configured as a power source (such as a battery or a power generation device). The circuit of the power source is electrically connected to the electric motor and the linear motor through different terminals of the reversing switch. By changing the circuit on-off state of the reversing switch, the main drive mechanism 22 and the telescopic drive mechanism 33 can be controlled to run separately. The main drive mechanism 22 and the telescopic drive mechanism 33 will not run at the same time. When the telescopic conveyor arm is extended, the conveyor belt 4 stops moving. After the telescopic conveyor arm is extended to the set length and the conveyor belt 4 is kept taut, the main drive mechanism 22 is switched to run, and the conveyor belt 4 can continue to move, which can improve the safety of use and prevent the conveyor belt 4 from moving while the telescopic conveyor arm is extended and retracted, thereby reducing the problem of the conveyor belt 4 loosening and falling off.

[0040] In addition, a motor and a pulley group can also be used to form a telescopic drive mechanism 33. The pulleys of the motor and the pulley group are installed on the conveying arm 2, and the telescopic arm 3 is connected to the belt of the pulley group. When the pulley moves, the telescopic arm 3 can be moved by pulling the belt.

[0041] In this embodiment, the power source 13 is installed below the material stacking platform 12, and the main drive mechanism 22 and the telescopic drive mechanism 33 are both installed at the proximal end of the conveying arm 2, so as to facilitate the connection between the power source 13 and the main drive mechanism 22 and the telescopic drive mechanism 33.

[0042] Furthermore, the telescopic arm 3 is also provided with an auxiliary driving mechanism 32 for driving the reversing wheel 31 at the proximal end of the telescopic arm 3 to rotate. The auxiliary driving mechanism 32 can be used to adjust the moving speed of the conveyor belt 4 at the reversing wheel 31 when the conveyor belt 4 moves, and the conveyor belt 4 can be tensioned. For example, the linear velocity of the outer periphery of the reversing wheel 31 is greater than the linear velocity of the outer periphery of the driving wheel, and the feeding conveyor belt passing through the guide wheel 21 and the reversing wheel 31 at the distal end of the telescopic arm 3 can be tensioned to facilitate stable material transportation. The auxiliary driving mechanism 32 can be a hydraulic motor or an electric motor, and a hydraulic source and a power source can be separately configured as needed, or it can be connected to the power source 13 in this embodiment through a pipeline or a power supply line, but the pipeline or power supply line between the auxiliary driving mechanism 32 and the power source 13 should have a margin to ensure that the pipeline or power supply line will not be torn off when the telescopic arm 3 slides.

[0043] As another improvement of the present embodiment, a sliding seat can be slidably arranged on the telescopic arm 3, and the sliding direction of the sliding seat relative to the telescopic arm 3 is parallel to the sliding direction of the telescopic arm 3 relative to the conveying arm 2. The reversing wheel 31 located at the proximal end of the telescopic arm 3 is rotatably connected to the sliding seat, and an elastic member is also installed on the sliding seat to drive the sliding seat to slide in a direction away from the distal end of the telescopic arm 3. The elastic member can be a compression spring or an elastic sheet in a compressed state. The elastic member is used to push the reversing wheel 31 at the proximal end of the telescopic arm 3 away from the reversing wheel 31 at the distal end of the telescopic arm 3, thereby promoting the conveyor belt 4 to remain tensioned as a whole, reducing the problem of the conveyor belt 4 loosening when the telescopic conveyor is working, and ensuring that the conveyor belt 4 can move smoothly.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A telescopic conveyor, characterized in that: It comprises a base, a telescopic conveying arm hinged to the base around a horizontal axis, and a conveying belt assembly for conveying materials, wherein: The end of the telescopic conveying arm close to the hinge position is defined as the proximal end, and the end away from the hinge position is defined as the distal end. The telescopic conveying arm includes a relatively sliding conveying arm and a telescopic small arm. The telescopic conveying arm is hinged to the base through the proximal end of the conveying arm, and a rotating drive component for driving the conveying arm to rotate is also connected between the conveying arm and the base. The telescopic small arm slides in a controlled manner along the length direction of the conveying arm. The conveyor belt assembly includes two pairs of guide wheels respectively arranged at the two ends of the conveying boom, two reversing wheels arranged at the two ends of the telescopic arm, and a closed-loop conveyor belt surrounding each guide wheel. The two pairs of guide wheels are respectively located at the two ends of the conveying boom, and the two pairs of guide wheels are distributed in a rectangular array. The pair of guide wheels at the far end of the conveying boom is defined as the far end guide wheel. The part of the conveyor belt located between the two far end guide wheels sequentially bypasses the two reversing wheels in the form of a return. The two reversing wheels are respectively located at the two ends of the telescopic arm, and the plane determined by the axes of the two reversing wheels is located between the two far end guide wheels. The two reversing wheels are respectively located on the inner side and the outer side of the conveyor belt. When the conveying arm slides relative to the conveying boom, the two sections of the conveyor belt between the two reversing wheels and the two far end guide wheels are respectively extended or shortened. With one of the guide wheels as a driving wheel, the telescopic conveyor also includes a main driving mechanism for driving the driving wheel to rotate, a telescopic driving mechanism for driving the telescopic small arm to slide back and forth relative to the conveying large arm, and a power source for providing energy to the main driving mechanism and the telescopic driving mechanism. The main driving mechanism and the telescopic driving mechanism are connected to the power source through a reversing switch / reversing valve, and the main driving mechanism and the telescopic driving mechanism are respectively connected to different terminals of the reversing switch or respectively connected to different outlets of the reversing valve.

2. A telescopic conveyor according to claim 1, characterized in that: The rotary drive assembly is a cylinder, a hydraulic cylinder or a screw module. The two parts of the rotary drive assembly that move relatively to each other are respectively hinged to the conveying arm and the base. The hinge axes are parallel to the rotation axis of the conveying arm, and the direction of the force exerted by the rotary drive assembly on the conveying arm is not coplanar with the rotation axis of the conveying arm.

3. A telescopic conveyor according to claim 1, characterized in that: The portion of the conveyor belt located between the two distal guide wheels is named the return conveyor belt. When the conveyor belt moves to transport materials using the portion of the conveyor belt with the outer side facing upward, the return conveyor belt passes through the reversing wheel at the distal end of the telescopic arm and the reversing wheel at the proximal end of the telescopic arm in sequence.

4. A telescopic conveyor as claimed in claim 3, characterized in that: The telescopic arm is also provided with a secondary driving mechanism for driving the reversing wheel at the proximal end of the telescopic arm to rotate, and during the process of conveying materials by the conveyor belt, the rotational linear speed of the reversing wheel at the proximal end of the telescopic arm is not lower than the moving speed of the conveyor belt; or The telescopic arm is provided with a sliding seat which slides along its length direction and an elastic member which drives the sliding seat to slide in a direction away from the far end of the telescopic arm. The reversing wheel at the proximal end of the telescopic arm is rotatably connected to the sliding seat.

5. A telescopic conveyor according to claim 1, characterized in that: The conveying arm also includes a side plate for installing each guide wheel, the side plate is fixedly connected with a guide rail for guiding the sliding of the telescopic arm, and the telescopic arm is slidably arranged on the guide rail.

6. A telescopic conveyor according to claim 1, characterized in that: A material stacking platform is also provided at one end of the top surface of the base, the power source is arranged below the material stacking platform, the proximal end of the telescopic conveying arm is arranged close to the material platform, and the driving wheel is a guide wheel located at the proximal end of the conveying arm.

7. A telescopic conveyor according to claim 1, characterized in that: Universal wheels are respectively arranged at the four corners of the bottom surface of the base.

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