A retractable roller conveyor with anti-stuck material function

Abstract

The present invention discloses a retractable roller conveyor for preventing material jamming, comprising two foldable frames, each foldable frame comprising a plurality of first, second, third and fourth support rods, the middle parts of the first and second support rods are hinged into an X shape by a middle bolt, the upper ends of the adjacent first and second support rods are hinged by an upper bolt, the lower ends of the adjacent first and second support rods are hinged by a lower bolt, a main roller is connected between two corresponding upper bolts, each lower bolt is also hinged to one end of two third support rods, and the other ends of two adjacent third support rods are hinged by a first connecting bolt; a middle support rod is connected between two corresponding middle bolts; the middle part and the lower part of the fourth support rod are respectively provided with a first and a second long strip through hole, each fourth support rod is movably sleeved on the middle bolt or the middle support rod, and the lower part is movably sleeved on the first connecting bolt, and an auxiliary roller is connected to the upper ends of the corresponding two fourth support rods. The present invention can effectively prevent material jamming.

Description

Technical Field

[0001] The invention relates to the technical field of logistics conveyor manufacturing, in particular to a retractable roller conveyor capable of preventing materials from being stuck. Background Art

[0002] Nowadays, roller conveyors have been widely used in various logistics industries. They effectively improve the efficiency of material transportation. In actual use, in order to facilitate the adjustment of the conveying position, the connection of each conveyor, or the storage when not in use, most of the existing roller conveyors are designed as a retractable structure. For example, on May 4, 2011, a Chinese invention patent with the patent number ZL201020262978.2 and the name "Telescopic Conveyor" was disclosed, which includes at least two frames, a folding frame, a roller I, and a roller II. Several sections of folding frames are arranged between the two adjacent frames, a roller I is arranged between the adjacent folding frames, and a roller II is arranged between the folding frame and the frame. The telescopic conveyor can be stretched to a suitable length according to actual conditions, and can be retracted when not in use for easy storage. It can be seen from the disclosed drawings that the folding frame is formed by a plurality of X-shaped brackets hinged together in the middle and pivoted to each other. There are two problems when the folding frame of this structure is stretched out for use. First, there is a large space between the rollers I, which makes it easy for the material to get stuck when conveying smaller or softer packaging materials. Second, the supporting structure is a quadrilateral, and each fulcrum of the quadrilateral (support shaft 5, rotating shaft I6, rotating shaft II7) is in a hinged state, and the overall supporting rigidity is poor. Especially when conveying heavier objects or bearing a larger impact load, the folding frame is easy to continue to extend, and the overall supporting rigidity is poor, which will reduce the reliability of conveying. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a retractable roller conveyor with anti-stuck materials, which can effectively prevent material jamming and ensure continuous material transportation without affecting the normal contraction and storage of the entire roller conveyor.

[0004] The two folding wheels are connected to each other with a plurality of first and second supporting legs, and the two folding wheels are connected in an X-shape at the middle parts of the two folding wheels. The upper end of each first supporting rod is hinged with the upper end of an adjacent second supporting rod by an upper bolt, and the lower end of each second supporting rod is hinged with the lower end of an adjacent first supporting rod by a lower bolt. A main roller is connected between the upper bolts corresponding to the two folding wheels, and the two folding wheels also include a plurality of third supporting rods and a plurality of fourth supporting rods, and each lower bolt is also hinged with one end of the two third supporting rods, and the other ends of the two adjacent third supporting rods are hinged by a first connecting bolt; a middle supporting rod is connected between the two corresponding middle bolts on the two folding wheels;

[0005] A first long strip through hole is provided in the middle of each fourth support rod, and a second long strip through hole is provided in the lower part. Each fourth support rod can be movably sleeved on the middle bolt or the middle support rod through the first long strip through hole. Each fourth support rod can be movably sleeved on the first connecting bolt through the second long strip through hole. The upper ends of the two fourth support rods at corresponding positions between the two foldable frames are connected to an auxiliary roller through two second connecting bolts.

[0006] After the two foldable frames are extended, each auxiliary roller is located between two adjacent main rollers, and the first connecting bolt is pressed against the upper side of the second elongated through hole so that the height position of the uppermost end of each auxiliary roller is level with or slightly lower than the height position of the uppermost end of the adjacent main roller; after the two foldable frames are retracted, each auxiliary roller is located below two adjacent main rollers.

[0007] As a further improvement, a lower support rod is fixedly connected between two corresponding lower bolts on the two foldable frames, so as to further improve the connection rigidity of the entire roller conveyor.

[0008] Preferably, the main drum includes a first cylindrical body and a first central support shaft, the first cylindrical body is sleeved outside the first central support shaft, both ends of the outer circumference of the first central support shaft are connected to both ends of the inner circumference of the first cylindrical body through a first bearing assembly, the first bearing assembly includes a first inner sleeve sleeved on the outer circumference of the first central support shaft, and a first outer sleeve matched with the first cylindrical body, and the first inner sleeve and the first outer sleeve are connected through a bearing; first mounting threaded holes are provided on both end surfaces of the first central support shaft, and each first mounting threaded hole is screwed to one of the upper bolts;

[0009] The auxiliary roller includes a second cylindrical body and a second center support shaft, the second cylindrical body is sleeved outside the second center support shaft, both ends of the outer circumference of the second center support shaft and both ends of the inner circumference of the second cylindrical body are connected through a second bearing assembly, the second bearing assembly includes a second inner sleeve sleeved on the outer circumference of the second center support shaft and a second outer sleeve matched with the second cylindrical body, the second inner sleeve and the second outer sleeve are connected through a bearing; second mounting threaded holes are provided on both end surfaces of the second center support shaft, and each second mounting threaded hole is screwed to one of the second connecting bolts.

[0010] As an improvement, a motor and a plurality of transition rollers are installed between the two foldable frames, each transition roller is installed on a middle support rod, and a driving wheel is fixedly connected to the driving shaft of the motor; the driving wheel drives the adjacent main roller to rotate through a driving belt, and the adjacent main rollers are connected to the transition roller through a driving belt to achieve mutual linkage; the first cylinder is provided with two annular grooves, and each driving belt cooperates with one of the annular grooves. In this way, the entire roller conveyor forms an electric roller conveyor, which further saves manpower and improves the conveying speed.

[0011] As another improvement, the first outer sleeve is injection molded, and two sets of synchronous belt wheel teeth are provided on the outer circumference of at least one of the two first bearing assemblies; a motor and a plurality of transition rollers are also installed between the two foldable frames, the transition rollers are installed on the middle support rod, and a driving wheel is fixedly connected to the driving shaft of the motor; the driving wheel is connected to the synchronous belt wheel teeth on the outer circumference of the first outer sleeve on the adjacent main roller through a synchronous belt to drive the adjacent main roller to rotate, and the adjacent main rollers are connected to the transition rollers through a synchronous belt to achieve mutual linkage. In this way, the entire roller conveyor forms another electric roller conveyor, which further saves manpower and improves the conveying speed.

[0012] As a further improvement, the middle bolt is further hinged to a limiter, which is located between the first support rod and the second support rod, so that when the foldable frame is folded, the limiter prevents adjacent main rollers from contacting each other, thereby preventing the surface of the main rollers from being lost during storage.

[0013] As a further improvement, one end of the first support rod closest to the support leg is hinged to the support leg via bolts; and one end of the second support rod closest to the support leg is hinged to the support leg via bolts.

[0014] As a further improvement, a roller is pivotally connected to the support legs on the same side of the two foldable frames, so as to facilitate receiving materials at the front and rear ends of the roller conveyor.

[0015] As a further improvement, a blocking frame is installed on one of the supporting legs on the same side of the two foldable frames to prevent materials from falling and being damaged.

[0016] Further improvement, each of the upper bolts is also hinged to the upper end of a telescopic rod, a third long strip through hole is provided at the lower part of the telescopic rod, the lower bolt passes through the third long strip through hole at the lower part of the telescopic rod, and after the two foldable frames are extended to the right position, the lower bolt supports the upper side of the third long strip through hole;

[0017] Or each lower bolt is also hinged to the lower end of a telescopic rod, a third long strip through hole is provided on the upper part of the telescopic rod, and the upper bolt passes through the third long strip through hole on the upper part of the telescopic rod. After the two foldable frames are extended into place, the upper bolt abuts against the lower side of the third long strip through hole.

[0018] In this way, through the supporting effect of the telescopic rod, after the foldable frame is extended, the original quadrilateral support structure forms two triangular stable support structures, which have better support rigidity and can withstand larger impact loads. The foldable frame has better stability after extension, and the entire roller conveyor can also form a stable support structure, which is convenient for conveying heavier weight items and has higher conveying reliability.

[0019] The invention relates to a method of hingedly connecting the two third supporting rods with each other, wherein the other ends of the two adjacent third supporting rods are hingedly connected by a first connecting bolt; a middle support rod is fixedly connected between the two corresponding middle bolts on the two foldable frames; a middle support rod is provided in the middle portion of each fourth support rod and a second elongated through hole is provided at the lower portion, wherein each fourth support rod can be movably sleeved on the middle bolt or the middle support rod through the first elongated through hole, and each fourth support rod can be movably sleeved on the first connecting bolt through the second elongated through hole, and the upper ends of the two fourth support rods at corresponding positions between the two foldable frames are connected to an auxiliary roller through two second connecting bolts; after the two foldable frames are extended, each auxiliary roller is between the two adjacent main rollers, and the first connecting bolt is pressed on the upper side of the second elongated through hole so that the height position of the uppermost end of each auxiliary roller is level with or slightly lower than the height position of the uppermost end of the adjacent main roller; after the two foldable frames are retracted, each auxiliary roller is below the two adjacent main rollers. When the two foldable frames are extended, the auxiliary roller is located between two adjacent main rollers, and under the support of the first connecting bolt, the height position of the top end of each auxiliary roller is level with or slightly lower than the height position of the top end of the adjacent main roller; most of the gap between the two main rollers is filled by the auxiliary roller, which effectively prevents materials from being stuck in the gap between the two main rollers. The main rollers and the auxiliary rollers cooperate with each other to ensure continuous material transportation, improve reliability, and be applicable to a wider range of conveying materials.

[0020] On the other hand, when not in use, when the two foldable frames are retracted, the two third support rods are brought close to each other, and then the auxiliary rollers are driven to shift through the first connecting bolt and the fourth support rod so that each auxiliary roller is under two adjacent main rollers. In this way, the normal retraction of the two foldable frames is not affected, and the normal retraction and storage of the entire roller conveyor is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of the first embodiment of the present invention in an extended state;

[0022] Figure 2 This is a front view of the first embodiment of the present invention in an extended state;

[0023] Figure 3 is a top view of the first embodiment of the present invention in an extended state;

[0024] Figure 4 It is a three-dimensional diagram from another angle of the first embodiment of the present invention in the extended state;

[0025] Figure 5 is a three-dimensional diagram of a fourth support rod of the first embodiment of the present invention;

[0026] Figure 6 is a three-dimensional diagram of a telescopic rod according to a first embodiment of the present invention;

[0027] Figure 7 This is a front view of the main drum of the first embodiment of the present invention;

[0028] Figure 8 yes Figure 7 AA section view;

[0029] Fig. 9 This is a front view of the auxiliary roller of the first embodiment of the present invention;

[0030] Fig.10 yes Fig. 9 BB cross-sectional view;

[0031] Fig.11 This is a front view of the first embodiment of the present invention in a retracted state;

[0032] Fig.12 This is a front view of the second embodiment of the present invention in the extended state;

[0033] Fig.13 is a top view of the third embodiment of the present invention in the extended state;

[0034] Fig.14 This is a front view of the main drum of the third embodiment of the present invention;

[0035] Fig.15 yes Fig.14CC cross-sectional view. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Embodiment 1 Figures 1 to 11 As shown, a retractable roller conveyor for preventing materials from getting stuck comprises two foldable frames 10, both ends of each foldable frame 10 are respectively connected to two supporting legs 20, each foldable frame 10 comprises a plurality of mutually parallel first supporting rods 1 and a plurality of mutually parallel second supporting rods 2, the middle parts of the first supporting rods 1 and the second supporting rods 2 are hinged into an X shape through middle bolts 3, the upper end of each first supporting rod 1 is hinged to the upper end of an adjacent second supporting rod 2 through an upper bolt 4, the lower end of each second supporting rod 2 is hinged to the lower end of an adjacent first supporting rod 1 through a lower bolt 5, a main roller 6 is connected between the upper bolts 4 corresponding to the two foldable frames 10, and each foldable frame 10 further comprises a plurality of third supporting rods 7 and a plurality of A fourth support rod 8, each lower bolt 5 is also hinged to one end of the two third support rods 7, and the other ends of the two adjacent third support rods 7 are hinged by a first connecting bolt 71; a middle support rod 31 is connected between the two corresponding middle bolts 3 on the two foldable frames 10; a first elongated through hole 8a is provided in the middle part of each fourth support rod 8, and a second elongated through hole 8b is provided in the lower part, each fourth support rod 8 can be movably sleeved on the middle support rod 31 through the first elongated through hole 8a, and each fourth support rod 8 can be movably sleeved on the first connecting bolt 71 through the second elongated through hole 8b, and the upper ends of the two fourth support rods 8 at the corresponding positions between the two foldable frames 10 are connected to an auxiliary roller 9 through two second connecting bolts 81.

[0038] After the two foldable frames 10 are extended into place, the first connecting bolt 71 presses against the upper side of the second elongated through hole 8b, and each auxiliary roller 9 is located between two adjacent main rollers 6. The height position of the uppermost end of each auxiliary roller 9 is level with or slightly lower than the height position of the uppermost end of the adjacent main roller 6.

[0039] Fig.11 As further shown, after the two foldable frames 10 are retracted, each auxiliary roller 9 is located below two adjacent main rollers 6 .

[0040] A lower support rod 51 is fixedly connected between the two corresponding lower bolts 5 on the two foldable frames 10 .

[0041] Figure 7 , Figure 8As further shown, the main drum 6 includes a first cylindrical body 61 and a first center support shaft 62, the first cylindrical body 61 is sleeved outside the first center support shaft 62, and both ends of the outer circumference of the first center support shaft 62 are connected to both ends of the inner circumference of the first cylindrical body 61 through a first bearing assembly 63, the first bearing assembly 63 includes a first inner sleeve 631 sleeved on the outer circumference of the first center support shaft 62, and a first outer sleeve 632 matched with the first cylindrical body 61, and the first inner sleeve 631 and the first outer sleeve 632 are connected through the first bearing 633; ​​first mounting threaded holes 621 are provided on both end faces of the first center support shaft 62, and each first mounting threaded hole 621 is screwed to one of the upper bolts 4.

[0042] Fig. 9 , Fig.10 As further shown, the auxiliary roller 9 includes a second cylindrical body 91 and a second center support shaft 92, the second cylindrical body 91 is sleeved outside the second center support shaft 92, and both ends of the outer circumference of the second center support shaft 92 are connected to both ends of the inner circumference of the second cylindrical body 91 through a second bearing assembly 93, the second bearing assembly 93 includes a second inner sleeve 931 sleeved on the outer circumference of the second center support shaft 92, and a second outer sleeve 932 matched with the second cylindrical body 91, and the second inner sleeve 931 and the second outer sleeve 932 are connected through a second bearing 933; second mounting threaded holes 921 are provided on both end surfaces of the second center support shaft 92, and each second mounting threaded hole 921 is screwed to one of the second connecting bolts 81.

[0043] The total length of the main roller 6 is greater than the total length of the auxiliary roller 9 .

[0044] A motor 30 and a plurality of transition rollers 40 are also installed between the two foldable frames 10. Each transition roller 40 is installed on a middle support rod 31. A driving wheel is fixedly connected to the driving shaft of the motor 30. The driving wheel drives the adjacent main rollers 6 to rotate through a driving belt 50. The adjacent main rollers 6 are each connected to the transition roller 40 through a driving belt 50 to achieve mutual linkage. Two annular grooves 611 are provided on the first cylindrical body 61, and each of the driving belts 50 cooperates with one of the annular grooves 611.

[0045] One end of the first support rod 1 closest to the support leg 20 is hinged to the support leg 20 via bolts; one end of the second support rod 2 closest to the support leg 20 is hinged to the support leg 20 via bolts.

[0046] Each of the upper bolts 4 is also hinged to the upper end of a telescopic rod 60, a third long strip through hole 601 is provided at the lower part of the telescopic rod 60, and the lower bolt 5 passes through the third long strip through hole 601 at the lower part of the telescopic rod 60; after the two foldable frames 10 are extended to the right position, the lower bolt 5 abuts against the upper side of the third long strip through hole 601. In another variation, each of the lower bolts is also hinged to the lower end of a telescopic rod, a third long strip through hole is provided at the upper part of the telescopic rod, and the upper bolt passes through the third long strip through hole at the upper part of the telescopic rod; after the two foldable frames are extended to the right position, the upper bolt abuts against the lower side of the third long strip through hole (not shown in the figure).

[0047] A roller 201 is also pivotally connected to the support leg 20 on the same side of the two foldable frames 10. The roller 201 is parallel to the main roller 6.

[0048] A blocking frame 70 is mounted on one of the supporting legs 20 located on the same side of the two foldable frames 10 .

[0049] In this embodiment, after the two foldable frames 10 are extended, each auxiliary roller 9 is located between two adjacent main rollers 6, and the height position of the uppermost end of each auxiliary roller 9 is equal to or slightly lower than the height position of the uppermost end of the adjacent main roller 6; the auxiliary support rolling action of the auxiliary roller 9 can prevent the material from being stuck between the two main rollers 6. Further, through the supporting action of the telescopic rod 60, when the main roller 6 is impacted, the first support rod 1 and the second support rod 2 will not be subjected to a force change state, thereby preventing the two foldable frames 10 from opening and affecting the reliable material transportation.

[0050] Fig.11 What is shown is the contracted state of this embodiment, that is, in the storage state, the two foldable frames 10 are contracted, the first support rod 1 and the second support rod 2 are close to each other, the two third support rods 7 are close to each other, the two main rollers 6 are close to each other, each auxiliary roller 9 is shifted to be below the two adjacent main rollers 6, the lower bolt 5 is against the lower side of the third elongated through hole 601, and the first connecting bolt 71 is against the lower side of the second elongated through hole 8b.

[0051] Embodiment 2 Fig.12 As shown, a retractable roller conveyor with anti-jamming function is shown, which is different from the first embodiment in that the middle bolt 3 is also hinged with a limit member 80, and the limit member 80 is located between the first support rod 1 and the second support rod 2. When the foldable frame 10 is retracted and folded, the limit member 80 prevents adjacent main rollers 6 from contacting each other.

[0052] Embodiment 3 Figures 13 to 15 As shown, a retractable roller conveyor with anti-jamming function is shown, which is different from the first embodiment in that the structures of the main roller 6, the transition roller 40, the driving wheel on the driving shaft of the motor 30 and the driving belt are different.

[0053] The first outer sleeve 632 on the main roller 6 is injection molded, and two sets of synchronous belt wheel teeth 6321 are arranged on the outer circumference of one of the first outer sleeves 632 of the two first bearing assemblies 63; a motor 30 and a plurality of transition rollers 40 are also installed between the two foldable frames 10, and two sets of synchronous belt wheel teeth are also arranged on each transition roller 40. The driving wheel on the driving shaft of the motor 30 is connected to the synchronous belt wheel teeth 6321 on the outer circumference of the first outer sleeve 632 on the adjacent main roller 6 through a synchronous belt 50 to drive the adjacent main roller 6 to rotate, and the adjacent main rollers 6 are connected to the transition roller 40 through a synchronous belt 50 to achieve mutual linkage. After the two foldable frames 10 are unfolded, the auxiliary roller 9 is also located between the two main rollers 6.

[0054] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A retractable roller conveyor for preventing materials from getting stuck, comprising two foldable frames, wherein the two ends of each foldable frame are respectively connected to two supporting legs, and each foldable frame comprises a plurality of mutually parallel first supporting rods and a plurality of mutually parallel second supporting rods, wherein the middle parts of the first supporting rods and the second supporting rods are hinged to form an X shape through middle bolts, wherein the upper end of each first supporting rod is hinged to the upper end of an adjacent second supporting rod through an upper bolt, and the lower end of each second supporting rod is hinged to the lower end of an adjacent first supporting rod through a lower bolt, and a main roller is connected between the upper bolts corresponding to the two foldable frames, wherein: It also includes a plurality of third support rods and a plurality of fourth support rods, each lower bolt is also hinged to one end of two third support rods, and the other ends of two adjacent third support rods are hinged to each other through a first connecting bolt; a middle support rod is connected between the two corresponding middle bolts on the two foldable frames; A first long strip through hole is provided in the middle of each fourth support rod, and a second long strip through hole is provided in the lower part. Each fourth support rod can be movably sleeved on the middle bolt or the middle support rod through the first long strip through hole. Each fourth support rod can be movably sleeved on the first connecting bolt through the second long strip through hole. The upper ends of the two fourth support rods at corresponding positions between the two foldable frames are connected to an auxiliary roller through two second connecting bolts. After the two foldable frames are extended, each auxiliary roller is located between two adjacent main rollers, and the first connecting bolt is pressed against the upper side of the second elongated through hole so that the height position of the uppermost end of each auxiliary roller is level with or slightly lower than the height position of the uppermost end of the adjacent main roller; after the two foldable frames are retracted, each auxiliary roller is located below two adjacent main rollers.

2. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: A lower support rod is fixedly connected between two corresponding lower bolts on the two foldable frames.

3. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: The main drum comprises a first cylindrical body and a first central support shaft, the first cylindrical body is sleeved outside the first central support shaft, both ends of the outer circumference of the first central support shaft are connected to both ends of the inner circumference of the first cylindrical body through a first bearing assembly, the first bearing assembly comprises a first inner sleeve sleeved on the outer circumference of the first central support shaft, a first outer sleeve matched with the first cylindrical body, the first inner sleeve and the first outer sleeve are connected through a bearing; first mounting threaded holes are provided on both end surfaces of the first central support shaft, and each first mounting threaded hole is screwed to one of the upper bolts; The auxiliary roller includes a second cylindrical body and a second center support shaft, the second cylindrical body is sleeved outside the second center support shaft, both ends of the outer circumference of the second center support shaft and both ends of the inner circumference of the second cylindrical body are connected through a second bearing assembly, the second bearing assembly includes a second inner sleeve sleeved on the outer circumference of the second center support shaft and a second outer sleeve matched with the second cylindrical body, the second inner sleeve and the second outer sleeve are connected through a bearing; second mounting threaded holes are provided on both end surfaces of the second center support shaft, and each second mounting threaded hole is screwed to one of the second connecting bolts.

4. The retractable anti-stuck roller conveyor according to claim 3, characterized in that: A motor and a plurality of transition rollers are also installed between the two foldable frames, each transition roller is installed on a middle support rod, and a driving wheel is fixedly connected to the driving shaft of the motor; the driving wheel drives the adjacent main rollers to rotate through a driving belt, and the adjacent main rollers are connected to the transition rollers through a driving belt to achieve mutual linkage; two annular grooves are provided on the first cylindrical body, and each of the driving belts cooperates with one of the annular grooves.

5. The retractable anti-stuck roller conveyor according to claim 3, characterized in that: The first outer sleeve is injection molded, and two sets of synchronous belt pulley teeth are provided on the outer circumference of at least one of the two first bearing assemblies; a motor and a plurality of transition rollers are also installed between the two foldable frames, and the transition rollers are installed on the middle support rod, and a driving wheel is fixedly connected to the driving shaft of the motor; the driving wheel is connected to the synchronous belt pulley teeth on the outer circumference of the first outer sleeve on the adjacent main roller through a synchronous belt to drive the adjacent main roller to rotate, and each adjacent main roller is connected to the transition roller through a synchronous belt to achieve mutual linkage.

6. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: The middle bolt is also hinged with a limiting member, which is located between the first support rod and the second support rod. When the foldable frame is contracted and folded, the limiting member prevents adjacent main rollers from contacting each other.

7. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: One end of the first support rod closest to the support leg is hinged to the support leg through a bolt; one end of the second support rod closest to the support leg is hinged to the support leg through a bolt.

8. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: A roller is pivotally connected to the supporting legs on the same side of the two foldable frames.

9. The retractable anti-stuck roller conveyor according to claim 1, characterized in that: A blocking frame is arranged on one of the supporting legs on the same side of the two foldable frames.

10. A retractable anti-stuck roller conveyor according to any one of claims 1 to 9, characterized in that: Each of the upper bolts is also hinged to the upper end of a telescopic rod, and a third long strip through hole is provided at the lower part of the telescopic rod, and the lower bolt passes through the third long strip through hole at the lower part of the telescopic rod. After the two foldable frames are extended to their proper positions, the lower bolt supports the upper side of the third long strip through hole; Or each lower bolt is also hinged to the lower end of a telescopic rod, a third long strip through hole is provided on the upper part of the telescopic rod, and the upper bolt passes through the third long strip through hole on the upper part of the telescopic rod. After the two foldable frames are extended into place, the upper bolt abuts against the lower side of the third long strip through hole.

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