A reversible telescoping conveyor

Abstract

The application discloses a reversible telescopic conveying device, which comprises a first conveying section, a second conveying section movably connected to the bottom of the first conveying section through a telescopic mechanism, and a reversible conveying section rotatably connected to the end of the second conveying section; the reversible conveying section comprises a reversible body rotatably connected to the second conveying section, and a limiting mechanism connected to the reversible body and the second conveying section respectively; the other end of the reversible body is a free end and can rotate around the connection between the reversible body and the second conveying section, so that the free end of the reversible body is overlapped on a receiving surface at different heights; and the limiting mechanism is used for limiting the rotation angle of the reversible body. The application can effectively solve the problem of poor adaptability of distance and height of the existing conveying device.

Description

Technical Field

[0001] This invention relates to the technical field of logistics transportation, and in particular to a reversible and telescopic conveyor. Background Technology

[0002] In modern warehousing and logistics, factory process connections, and truck loading and unloading, conveyor equipment such as roller / belt conveyors have become core equipment for small and medium-sized cargo transfers due to their advantages of simple structure, low maintenance costs, and wide adaptability. They are widely used in workshop assembly line connections, warehouse sorting and buffering, platform loading and unloading docking, and rack unloading conveyors. However, most of the conveyor equipment currently used in the industry is standardized equipment with fixed dimensions and structures. The overall length and overlap angle are preset parameters at the factory, which cannot be flexibly adjusted according to on-site working conditions. This exposes many shortcomings in adaptability in complex and ever-changing actual conveying scenarios, making it difficult to meet diverse and differentiated material transfer needs and greatly limiting the flexibility and efficiency of conveying operations.

[0003] On the one hand, existing fixed-size conveying equipment cannot adapt to variable conveying distances: In actual operation, the conveying distance between warehouses and trucks, and between workstations in various processes, varies flexibly depending on vehicle specifications, parking positions, and site layout, and is not fixed. Fixed-length conveying equipment cannot be extended or adjusted. When facing long-distance transfer conditions, a single piece of equipment cannot cover the entire distance. When facing short-distance conditions, excessively long equipment will occupy the operating aisle, encroaching on passage and operating space, posing safety hazards. On the other hand, fixed-size conveying equipment is difficult to adapt to end-of-line docking platforms of different heights: The height of the receiving surfaces of loading and unloading platforms and workshop workstations varies significantly. Traditional conveying equipment has a fixed end-of-line overlap angle and cannot adaptively adjust the docking height, which easily leads to docking height discrepancies. When the heights do not match, problems such as poor unloading can easily occur, seriously affecting the continuity of conveying and the integrity of materials. In summary, there is an urgent need for a conveying equipment that can be extended and adjusted in distance and has an adaptive end-of-line overlap to solve the industry pain point of poor distance and height adaptability of existing conveying equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing fixed-size conveying equipment, which is difficult to adapt to end docking platforms of different heights and cannot adaptively adjust the docking height. This invention provides a flip-up telescopic conveying device that can effectively solve the problem of poor distance and height adaptability of existing conveying equipment.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A reversible telescopic conveying device includes a first conveying section, a second conveying section that is movably telescopically extended and retractable at the bottom of the first conveying section via a telescopic mechanism, and a reversible conveying section rotatably connected at one end to the end of the second conveying section. The reversible conveying section includes a reversible body rotatably connected at one end to the second conveying section, and limiting mechanisms connecting the reversible body and the second conveying section respectively. The other end of the reversible body is a free end and can rotate around its connection with the second conveying section, thereby allowing its free end to overlap with receiving surfaces at different heights. The limiting mechanism is used to limit the reversing angle of the reversible overlapping section.

[0007] Furthermore, it also includes a transition conveying section with one end rotatably connected to the end of the first conveying section. The other end of the transition conveying section is a free end and can rotate around its connection with the first conveying section, so that its free end can overlap the conveying surface at different positions after the second conveying section has extended or retracted.

[0008] Further, the limiting mechanism includes a bearing seat, a swing rod, a roller, a spring, a cam plate, and a rotating shaft; the bearing seat is fixed to the bottom end of the second conveying section, one side of the swing rod is rotatably mounted on the bearing seat via the rotating shaft, and the roller is rotatably mounted on the other side of the swing rod; the cam plate is located on the side of the tilting body and can rotate synchronously with the tilting body, and its outer circumference is in rolling contact with the roller; one end of the spring is connected to the swing rod, and its other end is connected to the second conveying section; when the tilting body is adjusted to the target angle, the spring force causes the swing rod to drive the roller to abut against the outer circumference of the cam plate, limiting the rotation angle of the tilting body; by pressing the swing rod, the roller is disengaged from the cam plate, releasing the angle limitation to adjust the tilting angle of the tilting body.

[0009] Furthermore, the outer periphery of the cam plate includes a groove limiting portion, an arc portion, and a protrusion limiting portion. The roller rolls against the arc portion, and the roller can be respectively limited in the groove limiting portion and the protrusion limiting portion. The number of the arc portion and the groove limiting portion is at least one, and the contours of different arc portions are located on the same circle.

[0010] Furthermore, when the number of arcs is greater than one, the sum of the radii of the different arcs is greater than 120°.

[0011] Furthermore, the tilting body is rotatably connected to the end of the second conveying section via bearings, and several unpowered rollers are arranged in parallel on the tilting body; the side of the tilting body is also provided with a handle for easy external rotation operation.

[0012] Furthermore, the transition conveying section includes a fixed seat, a rotating seat, and a tongue plate; the fixed seat is connected to the end of the first conveying section; one end of the rotating seat is rotatably connected to the fixed seat, and the other end is connected to the tongue plate; both the fixed seat and the rotating seat are provided with a plurality of parallel unpowered rollers; a hook is also rotatably connected to the fixed seat; the rotating seat is provided with a locking part that cooperates with the hook; when the rotating seat rotates and flips, the angle of the rotating seat is fixed by the hook engaging the locking part.

[0013] Furthermore, the telescopic mechanism includes a guide rail mechanism disposed at the bottom of the first conveying section and a rolling mechanism disposed on the second conveying section; the guide rail mechanism includes two symmetrically arranged linear tracks, a limiting wheel disposed at one end of each linear track, and a limiting plate disposed at the other end of the linear track; the width direction of the second conveying section is limited between the two limiting wheels, and the length direction of the second conveying section is limited to telescopic movement between the limiting wheel and the limiting plate.

[0014] Furthermore, the rolling mechanism includes a traveling caster located at the bottom of one end of the second conveying section, and a traveling wheel and a guide wheel located on the side wall of the other end of the second conveying section with their axes perpendicular to each other. The traveling wheel is used to travel on the horizontal plane of the straight track, and the guide wheel is used to travel on the side wall of the straight track.

[0015] Furthermore, the first conveying section includes an inclined section body with an inclined conveying surface, a horizontal section body with no inclined conveying surface, and a plurality of unpowered rollers arranged in parallel on the inclined section body and the horizontal section body; the second conveying section includes a second body with an inclined conveying surface, and a plurality of unpowered rollers arranged in parallel on the second body.

[0016] Furthermore, the tilt angle of the inclined fuselage section and the second fuselage ranges from 1 to 10°.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. The second conveying section of the present invention can be extended and retracted at the bottom of the first conveying section through a telescopic mechanism. It can flexibly extend or retract according to the on-site transfer distance, adapt to different lengths of conveying stroke, and freely change the overall conveying length of the machine. It eliminates the need for multi-section splicing and manual transfer, greatly improving the equipment's versatility and site adaptability. The flipping conveying section can be rotated and adjusted at any angle, and can flexibly overlap on bearing surfaces of different heights, effectively eliminating docking height differences, preventing problems such as poor unloading, and ensuring the continuity of conveying and the integrity of materials.

[0019] 2. This invention adds a transition conveyor section. This transition conveyor section, relying on its own rotational characteristics, can adapt in real time to different docking positions after the extension and retraction of the second conveyor section. Its free end always fits and overlaps the conveying surface of the second conveyor section. On the one hand, it can adaptively compensate for the dynamic docking gaps caused by the extension and retraction adjustment. Under any extension and retraction stroke of the equipment, a continuous and complete transition conveyor plane can be formed between the first and second conveyor sections, filling the positional deviation and connection gap between the two conveyor sections, ensuring the integrity and continuity of the conveying channel under long and short distance adjustment conditions. On the other hand, when the transition conveyor section rotates to a vertical state, it can also physically cut off the conveying channel, temporarily intercept packages, realize package storage, and has simple scheduling capabilities, adapting to intermittent loading and unloading operations, further improving the structural adaptability of the entire telescopic conveyor equipment.

[0020] 3. This invention utilizes a limiting mechanism to precisely limit and fix the flipping angle, so that the flipping body of the flipping conveyor section remains locked after adjustment, resisting material impact and preventing rebound and shaking, while taking into account both adjustment flexibility and operational stability. Attached Figure Description

[0021] Figure 1 This is one of the overall structural schematic diagrams of the telescopic conveyor device of the present invention.

[0022] Figure 2 This is the second schematic diagram of the overall structure of the telescopic conveyor device of the present invention.

[0023] Figure 3 This is a plan view of the connection between the flipping conveyor section and the second conveyor section in this invention.

[0024] Figure 4 This is a schematic diagram of one flipping state of the flipping conveyor section in this invention.

[0025] Figure 5 This is a schematic diagram of another flipping state of the flipping conveyor section in this invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the connection between the flipping conveyor section and the second conveyor section in this invention.

[0027] Figure 7 This is a schematic diagram of the transition conveying section in this invention.

[0028] Figure 8 This is a schematic diagram of the rolling mechanism in this invention.

[0029] Figure 9 This is a schematic diagram of the guide rail mechanism in this invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] like Figure 1 and Figure 2 As shown, this embodiment provides a reversible telescopic conveying device, including a first conveying section 1, a second conveying section 3 that can be movably extended and retracted at the bottom of the first conveying section 1 via a telescopic mechanism, and a reversible conveying section 5 that is rotatably connected at one end to the end of the second conveying section 3; the reversible conveying section 5 includes a reversible body 51 that is rotatably connected at one end to the second conveying section 3, and a limiting mechanism 52 that connects the reversible body 51 and the second conveying section 3 respectively. The other end of the reversible body 51 is a free end and can rotate around its connection with the second conveying section 3, so that its free end overlaps the receiving surface at different heights. The limiting mechanism 52 is used to limit the reversible angle of the reversible overlapping section 5.

[0032] In this embodiment, the second conveying section 3 can be retracted and stored at the bottom of the first conveying section 1 via a telescopic mechanism. It can flexibly extend or retract according to the on-site transfer distance, adapt to different lengths of conveying stroke, and freely change the overall conveying length of the machine. It eliminates the need for multi-section splicing and manual transfer, greatly improving the equipment's versatility and site adaptability. The tilting body 51 of the end tilting conveying section 5 can be rotated and adjusted at any angle, and can flexibly overlap with bearing surfaces of different heights, eliminating the drop difference at the docking point and ensuring a smooth transition of materials. The tilting angle is precisely limited and fixed by the limiting mechanism 52, so that the tilting body 51 of the tilting conveying section 5 remains locked after being adjusted to the correct position, resisting material impact and preventing rebound and shaking, thus balancing adjustment flexibility and operational stability.

[0033] like Figure 1 and Figure 2 As shown, the reversible telescopic conveyor also includes a transition conveyor section 4 rotatably connected at one end to the end of the first conveyor section 1. The other end of the transition conveyor section 4 is a free end and can rotate around its connection with the first conveyor section 1, so that its free end can be attached to the conveyor surface at different positions after the second conveyor section 3 is extended or retracted.

[0034] This embodiment further adds a transition conveyor section 4, which can adaptively rotate and overlap with the extension and retraction position of the second conveyor section 3. During the process of the second conveyor section 3 extending or retracting through the telescopic mechanism, changing the overall conveying length, the transition conveyor section 4 can rely on its own rotational characteristics to adapt to different docking positions of the second conveyor section 3 after extension and retraction in real time, with its free end always adhering to the conveying surface of the second conveyor section 3. This structure, on the one hand, can adaptively compensate for the dynamic docking gaps generated by the telescopic adjustment. Under any extension and retraction stroke of the equipment, a continuous and complete transition conveying plane can be formed between the first conveyor section 1 and the second conveyor section 3, filling the positional deviation and connection gap between the two conveyor sections, ensuring the integrity and continuity of the conveying channel under long and short distance adjustment conditions. On the other hand, when the transition conveyor section 4 rotates to a vertical state, it can also physically cut off the conveying channel, temporarily intercept packages, realize package storage, and has simple scheduling capabilities, adapting to intermittent loading and unloading operations, further improving the structural adaptability of the entire telescopic conveying equipment.

[0035] like Figure 3 and Figure 6 As shown, the limiting mechanism 52 includes a bearing seat 521, a swing rod 522, a roller 523, a spring 524, a cam plate 525, and a rotating shaft 526. The bearing seat 521 is fixed to the bottom end of the second conveying section 3. One side of the swing rod 522 is rotatably mounted on the bearing seat 521 via the rotating shaft 526, and the roller 523 is rotatably mounted on the other side of the swing rod 522. The cam plate 525 is located on the side of the tilting body 51 and can rotate synchronously with the tilting body 51. The roller 523 rolls in contact with the circumference of the cam plate 525; one end of the spring 524 is connected to the swing rod 522, and the other end is connected to the second conveying section 3; when the tilting body 51 is adjusted to the target angle, the spring force of the spring 524 causes the swing rod 522 to drive the roller 523 to abut against the outer circumference of the cam plate 525, limiting the rotation angle of the tilting body 51; by pressing the swing rod 522, the roller 523 is disengaged from the cam plate 525, releasing the angle limit to adjust the tilting angle of the tilting body 51.

[0036] Under normal operating conditions: Spring 524 continuously provides pre-tightening force, driving swing rod 522 to press and adhere roller 523 to the outer periphery of cam plate 525. The cam profile surface constrains the rotational freedom of tilting body 51, allowing tilting body 51 to be stably limited to any overlapping angle, achieving adaptive pressure holding and positioning. When the docking height needs to be adjusted: Manually press swing rod 522 to overcome the spring force of spring 524, causing roller 523 to disengage from cam plate 525, thus releasing the angle lock and allowing tilting body 51 to rotate freely to complete the angle adjustment. After releasing swing rod 522, spring 524 returns to its original position, and roller 523 re-adheres to cam plate 525, achieving angle limit locking again.

[0037] The technical advantage of the limiting mechanism 52 in this embodiment is that, relying on the curved contour of the cam plate 525 and the elastic clamping structure, it can stably limit the tilting angle of the tilting body 51 at any angle without fixed position restrictions. Compared with the traditional hole locking and buckle limiting methods, it has stronger adaptability and can accurately match the different docking heights of various trucks, platforms, and workstations. Simply press the swing rod 522 to quickly unlock and adjust the angle, and release it to automatically reset and lock. The adjustment operation is simple, labor-saving, and convenient. A single person can quickly complete the height switching, which is suitable for the frequent docking operation needs of loading and unloading scenarios.

[0038] like Figure 4 and Figure 5 As shown, the outer periphery of the cam plate 525 includes a slot limiting portion 5251, an arc portion 5252, and a protrusion limiting portion 5253. The roller 523 rolls against the arc portion 5252, and the roller 523 can be respectively limited in the slot limiting portion 5251 and the protrusion limiting portion 5253. The number of arc portions 5252 and slot limiting portions 5251 is at least one, and the centers of different arc portions 5252 are the same.

[0039] In a specific embodiment, the sum of the arcs of the different arc portions 5252 is greater than 120°.

[0040] The arc section 5252 serves as an effective adjustable surface. The fact that the centers of different arc sections 5252 are the same ensures that the arc contours of different segments of the arc section 5252 are located on the same circle, corresponding to the normal overlap angle adjustment range of the flipping body 51. This ensures that the flipping body 51 can smoothly and steplessly adjust the overlap angle. The slot limit section 5251 and the protrusion limit section 5253 respectively form mechanical hard limits, restricting the maximum rolling stroke of the roller 523 and preventing the flipping body 51 from over-flipping upwards or downwards. This avoids problems such as over-flipping, structural interference, and excessive overlap angle causing detachment, thus limiting the flipping angle to a safe and reasonable working range. Multiple slot limit sections 5251 can achieve fixed limits at multiple angles. The large arc surface with a radius greater than 120° provides sufficient rolling range for the roller 523, allowing the flipping body 51 to obtain a larger flipping adjustment angle range and cover a larger height difference receiving platform.

[0041] In one specific embodiment, such as Figure 4 and Figure 5 As shown, the slot limiting part 5251 includes two parts, and the arc part 5252 includes two segments. The side slot limiting part 5251 limits the maximum rolling stroke of the roller 523, and the middle slot limiting part 5251 divides the arc part 5252 into two segments. The middle slot limiting part 5251 achieves stable limiting of the middle angle.

[0042] In one specific embodiment, such as Figure 6As shown, there are two of each of the bearing housing 521, swing rod 522, roller 523, spring 524, and cam plate 525, which are arranged symmetrically.

[0043] In one specific embodiment, such as Figure 6 As shown, a rotating shaft 526 is synchronously connected between the two bearing seats 521, and a connecting rod 527 is also provided between the two swing rods 522.

[0044] like Figure 3 and Figure 6 As shown, the tilting body 51 is rotatably connected to the end of the second conveying section 3 via a bearing. Several unpowered rollers are arranged in parallel on the tilting body 51. The side of the tilting body 51 is also provided with a handle 54 for easy external rotation operation.

[0045] like Figure 7 As shown, the transition conveying section 4 includes a fixed seat 41, a rotating seat 42, and a tongue plate 43; the fixed seat 41 is connected to the end of the first conveying section 1; one end of the rotating seat 42 is rotatably connected to the fixed seat 41, and the other end is connected to the tongue plate 43; both the fixed seat 41 and the rotating seat 42 are provided with several parallel non-powered rollers; a hook 411 is also rotatably connected to the fixed seat 41; the rotating seat 42 is provided with a locking part 412 that cooperates with the hook 411; when the rotating seat 42 rotates and flips, the angle of the rotating seat 42 is fixed by locking the hook 411 with the locking part 412.

[0046] Both the fixed seat 41 and the rotating seat 42 are equipped with non-powered rollers to ensure smooth material transition and avoid obstruction at the joint. At the same time, a mechanical locking mechanism is formed by hook 411 and locking part 412: after the rotating seat 42 is adjusted to a suitable overlapping position, the hook 411 is rotated to lock the locking part 412, locking the rotation angle of the rotating seat 42. At this time, the conveying channel can be physically cut off, and the package can be temporarily intercepted for temporary storage. After the hook 411 is released, the position can be readjusted to adapt to the different heights and spacings after the extension and retraction of the second conveying section 3.

[0047] In a specific embodiment, the snap-fit ​​part 412 is a pull ring provided on the rotating seat 42, which can be easily rotated by external force.

[0048] like Figure 1 and Figure 9 As shown, the telescopic mechanism includes a guide rail mechanism 21 located at the bottom of the first conveying section 1 and a rolling mechanism located on the second conveying section 3. The guide rail mechanism 21 includes two symmetrically arranged linear tracks 211, a limiting wheel 212 located at one end of each linear track 211, and a limiting plate 213 located at the other end of the linear track 211. The width direction of the second conveying section 3 is limited between the two limiting wheels 212, and the length direction of the second conveying section 3 is limited between the limiting wheel 212 and the limiting plate 213.

[0049] like Figure 8 As shown, the rolling mechanism includes a traveling caster 221 located at the bottom of one end of the second conveying section 3, and a traveling wheel 222 and a guide wheel 223 located on the side wall of the other end of the second conveying section 3 with their axes perpendicular to each other. The traveling wheel 222 is used to travel on the horizontal plane of the straight track 211, and the guide wheel 223 is used to travel on the side wall of the straight track 211.

[0050] The traveling casters 221 are arranged at the bottom of the second conveyor section 3 to directly support the main body of the second conveyor section 3. During the extension and retraction process, they bear the vertical load, transfer the weight of the extension section and the material load to the ground, reduce the frictional resistance during extension and retraction, and facilitate manual pulling out and retracting of the extension section.

[0051] In a specific embodiment, the walking caster 221 may have a self-locking function to achieve locking at different extension and retraction positions.

[0052] like Figure 1 and Figure 2 As shown, the first conveying section 1 includes an inclined section body 11 with an inclined conveying surface, a horizontal section body 12 with no inclined conveying surface, and a plurality of unpowered rollers arranged parallel to the inclined section body 11 and the horizontal section body 12; Figure 8 As shown, the second conveying section 3 includes a second body 31 with an inclined conveying surface and a plurality of unpowered rollers arranged in parallel on the second body 31.

[0053] It should be noted that both the first conveying section 1 and the second conveying section 3 use non-powered rollers for package conveying, so a certain inclination angle is required to ensure smooth package start-up: the inclined section of the machine body 11 in the first conveying section 1 ensures smooth package start-up without material blockage through the inclination angle, while the horizontal section of the machine body 12 at the rear end inhibits continuous acceleration of the package, solving the problem of continuous increase in material speed, collision damage, and rushing out of the roller table during long-distance conveying under pure gravity. This achieves speed control under gravity conveying conditions, allowing the package to gradually enter the second conveying section 3. The second conveying section 3 relies on the inclination angle to adjust the material descent rate step by step, achieving stable speed control over long distances.

[0054] In a specific embodiment, the tilt angle of the inclined section of the machine body 11 and the second machine body 31 ranges from 1 to 10°. In order to ensure a good conveying speed under the premise of unpowered conveying, the tilt angle of the inclined section of the machine body 11 and the second machine body 31 is reasonably set and adjusted to adapt to different conveying distances.

[0055] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A reversible telescopic conveyor, characterized in that: It includes a first conveying section (1), a second conveying section (3) that is movably extended and retractable at the bottom of the first conveying section (1) via a telescopic mechanism, and a flipping conveying section (5) that is rotatably connected at one end to the end of the second conveying section (3); the flipping conveying section (5) includes a flipping body (51) that is rotatably connected at one end to the second conveying section (3), and a limiting mechanism (52) that connects the flipping body (51) and the second conveying section (3) respectively. The other end of the flipping body (51) is a free end and can rotate around its connection with the second conveying section (3), so that its free end overlaps the bearing surface at different heights. The limiting mechanism (52) is used to limit the flipping angle of the flipping overlapping section (5).

2. The reversible telescopic conveyor according to claim 1, characterized in that: It also includes a transition conveying section (4) with one end rotatably connected to the end of the first conveying section (1). The other end of the transition conveying section (4) is a free end and can rotate around the connection between it and the first conveying section (1), so that its free end can overlap the conveying surface at different positions after the second conveying section (3) is extended or retracted.

3. The reversible telescopic conveyor according to claim 1, characterized in that: The limiting mechanism (52) includes a bearing seat (521), a swing rod (522), a roller (523), a spring (524), a cam plate (525), and a rotating shaft (526); the bearing seat (521) is fixed to the bottom end of the second conveying section (3), one side of the swing rod (522) is rotatably mounted on the bearing seat (521) via the rotating shaft (526), ​​and the roller (523) is rotatably mounted on the other side of the swing rod (522); the cam plate (525) is located on the side of the tilting body (51) and can rotate synchronously with the tilting body (51), and its outer periphery The spring (524) is in rolling contact with the roller (523); one end of the spring (524) is connected to the swing rod (522), and the other end is connected to the second conveying section (3); when the tilting body (51) is adjusted to the target angle, the spring force of the spring (524) causes the swing rod (522) to drive the roller (523) to abut against the outer periphery of the cam plate (525), limiting the rotation angle of the tilting body (51); by pressing the swing rod (522), the roller (523) is disengaged from the cam plate (525), releasing the angle limit to adjust the tilting angle of the tilting body (51).

4. The reversible telescopic conveyor according to claim 3, characterized in that: The outer periphery of the cam plate (525) includes a groove limiting part (5251), an arc part (5252), and a protrusion limiting part (5253). The roller (523) rolls against the arc part (5252), and the roller (523) can be respectively limited in the groove limiting part (5251) and the protrusion limiting part (5253). The number of the arc part (5252) and the groove limiting part (5251) is at least one, and the contours of different arc parts (5252) are located on the same circle.

5. The reversible telescopic conveyor according to claim 1, characterized in that: The tilting body (51) is rotatably connected to the end of the second conveying section (3) via a bearing. Several unpowered rollers are arranged in parallel on the tilting body (51). The side of the tilting body (51) is also provided with a handle (54) for easy external rotation operation.

6. The reversible telescopic conveyor according to claim 2, characterized in that: The transition conveying section (4) includes a fixed seat (41), a rotating seat (42), and a tongue plate (43); the fixed seat (41) is connected to the end of the first conveying section (1); one end of the rotating seat (42) is rotatably connected to the fixed seat (41), and the other end is connected to the tongue plate (43); both the fixed seat (41) and the rotating seat (42) are provided with a plurality of parallel unpowered rollers; the fixed seat (41) is also rotatably connected with a hook (411); the rotating seat (42) is provided with a snap-fit ​​part (412) that cooperates with the hook (411); when the rotating seat (42) rotates and flips, the angle of the rotating seat (42) is fixed by snapping the snap-fit ​​part (412) with the hook (411).

7. The reversible telescopic conveyor according to claim 1, characterized in that: The telescopic mechanism includes a guide rail mechanism (21) at the bottom of the first conveying section (1) and a rolling mechanism on the second conveying section (3); the guide rail mechanism (21) includes two symmetrically arranged straight rails (211), a limiting wheel (212) at one end of each straight rail (211), and a limiting plate (213) at the other end of the straight rail (211); the width direction of the second conveying section (3) is limited between the two limiting wheels (212), and the length direction of the second conveying section (3) is limited between the limiting wheels (212) and the limiting plate (213).

8. A reversible telescopic conveyor according to claim 7, characterized in that: The rolling mechanism includes a traveling caster (221) located at the bottom of one end of the second conveying section (3), and a traveling wheel (222) and a guide wheel (223) located on the side wall of the other end of the second conveying section (3) with their axes perpendicular to each other. The traveling wheel (222) is used to travel on the horizontal plane of the straight track (211), and the guide wheel (223) is used to travel on the side wall of the straight track (211).

9. A reversible telescopic conveyor according to claim 1, characterized in that: The first conveying section (1) includes an inclined section body (11) with an inclined conveying surface, a horizontal section body (12) with no inclined conveying surface, and a plurality of unpowered rollers arranged in parallel on the inclined section body (11) and the horizontal section body (12); the second conveying section (3) includes a second body (31) with an inclined conveying surface, and a plurality of unpowered rollers arranged in parallel on the second body (31).

10. A reversible telescopic conveyor according to claim 9, characterized in that: The tilt angle range of the inclined section fuselage (11) and the second fuselage (31) is 1~10°.

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