Multi-layer telescopic roller conveyor

Abstract

The invention discloses a multilayer telescopic roller conveyor, and belongs to the field of roller conveyors, the multilayer telescopic roller conveyor comprises a main telescopic frame and a plurality of support frames, the main telescopic frame comprises a plurality of groups of first main support arms and second main support arms, and the plurality of groups of first main support arms and second main support arms form a scissor telescopic structure; an upper-layer conveying roller is rotationally connected to the pivot joint of the upper ends of the first main supporting arm and the second main supporting arm, a middle-layer conveying roller is rotationally connected to the pivot joint of the middles of the first main supporting arm and the second main supporting arm, and a lower-layer conveying roller is rotationally connected to the pivot joint of the lower ends of the first main supporting arm and the second main supporting arm. The supporting frame comprises supporting legs, and the inner sides of the supporting legs are connected with side frames. The upper-layer conveying roller, the middle-layer conveying roller and the lower-layer conveying roller form a three-layer goods conveying channel, classified conveying of at least three kinds of goods is achieved through one conveyor, the occupied space of a plurality of conveyors is reduced, and the goods classified conveying efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of roller conveyors, and particularly relates to a multi-layer telescopic roller conveyor. Background Art

[0002] In many fields such as modern logistics, warehousing, and manufacturing, the conveying link of items is crucial, and its efficiency and flexibility directly affect the smoothness and cost of the entire production or operation process. As a common conveying device, the telescopic roller conveyor, with its telescopic characteristics, can flexibly adapt to changes in different site spaces and conveying distances, and has been widely used in many scenarios such as warehousing, logistics sorting, and production line material transmission.

[0003] However, the existing telescopic roller conveyors on the market generally have structural limitations, and the vast majority adopt a single-layer structure design. This single-layer structure gradually exposes many problems when facing the increasingly complex and diverse item conveying requirements, seriously restricting the conveying efficiency and cost control.

[0004] On the one hand, enterprises may choose to use multiple single-layer roller telescopic conveyors. Each conveyor is specifically responsible for conveying a specific type of item, and in this way, the classification conveying of items is achieved. First of all, from a cost perspective, purchasing multiple conveyors requires a large amount of capital investment, including equipment procurement costs, installation and commissioning costs, and subsequent maintenance and repair costs, etc. For some small and medium-sized enterprises, this is undoubtedly a heavy burden, greatly increasing the operating costs of the enterprises. Secondly, multiple conveyors need to occupy a large amount of site space. In the current situation where site resources are becoming increasingly tense, this will undoubtedly further exacerbate the site pressure of the enterprises, restricting the production layout and development space of the enterprises.

[0005] On the other hand, if the one-by-one conveying method is adopted, that is, after all items of one type are conveyed, then the conveyance of the next type of item is carried out. Although it saves equipment costs and site space to a certain extent, it seriously affects the conveying efficiency. In actual production or logistics operations, time is efficiency, and efficiency is competitiveness. The one-by-one conveying method will cause a large amount of waiting time for items in the conveying link, extending the cycle of the entire production or logistics process, and unable to meet the urgent needs of modern industrial production and logistics operations for high-efficiency, flexible, and low-cost conveying equipment. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-layer telescopic roller conveyor to solve the problems of low conveying efficiency, high cost, and large occupied space of the existing telescopic roller conveyor, and improve the efficiency, flexibility, and economy of cargo conveyance.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: A multi-layer telescopic roller conveyor, comprising: A main telescopic frame, the main telescopic frame includes multiple groups of first main support arms and second main support arms, the middle parts of the first main support arms and the second main support arms are pivotally connected, the ends of multiple first main support arms and second main support arms are sequentially pivotally connected, and multiple groups of first main support arms and second main support arms form a scissor telescopic structure. The upper ends of the first main support arms and the second main support arms are rotatably connected with upper-layer conveying rollers, the middle pivots of the first main support arms and the second main support arms are rotatably connected with middle-layer conveying rollers, and the lower pivots of the first main support arms and the second main support arms are rotatably connected with lower-layer conveying rollers; the upper-layer conveying rollers, the middle-layer conveying rollers and the lower-layer conveying rollers form a three-layer goods conveying channel.

[0008] It further includes multiple support frames, which are arranged on both sides of the main telescopic frame and used to support the main telescopic frame. It includes legs, the lower part of the legs is provided with casters, the inner side of the legs is connected with side frames, the upper-layer conveying rollers on one side of the side frames are rotatably connected with the side frames, and the side frames are also provided with first guide grooves, and the ends of the lower-layer conveying rollers on one side of the side frames are slidably installed in the first guide grooves.

[0009] Further, a sleeve is fixedly connected to one side of the side frame, the leg is installed in the sleeve with a gap, and a number of equally spaced adjustment holes are provided on the leg. A pin is provided at the lower part of the sleeve for adjusting the height of the leg.

[0010] Further, a telescopic mechanism is provided at the lower part of one end of the side frame, the end of the telescopic rod of the telescopic mechanism is connected with a slider, and the lower-layer conveying roller is rotatably connected with the slider; when the telescopic mechanism expands and contracts, it drives the slider to move up and down inside the side frame, thereby driving the lower-layer conveying roller at the end to move up and down.

[0011] Furthermore, the telescopic mechanism adopts one of a cylinder, a hydraulic cylinder or an electric cylinder.

[0012] Further, it also includes a driving mechanism. The driving mechanism includes a motor installed on the support frame at one end, a speed reducer is connected to one side of the motor, the output shaft of the speed reducer is connected with the upper-layer conveying roller at one end of the main telescopic frame, and a transmission mechanism is provided on one side of the main telescopic frame. The transmission mechanism includes a first upper-layer belt pulley installed at one end of the upper-layer conveying roller, a first middle-layer belt pulley installed at one end of the middle-layer conveying roller, and a first lower-layer belt pulley installed at one end of the lower-layer conveying roller. Multiple first upper-layer belt pulleys, first middle-layer belt pulleys and first lower-layer belt pulleys on one side of the main telescopic frame are sequentially connected by a transmission belt.

[0013] Furthermore, a second upper-layer belt pulley is fixedly connected to one end of the upper-layer conveying roller, a second middle-layer belt pulley is fixedly connected to one end of the middle-layer conveying roller, and a second lower-layer belt pulley is fixedly connected to one end of the lower-layer conveying roller; Auxiliary telescopic frames are provided on both sides of the upper conveying roller, the middle conveying roller, and the lower conveying roller. The auxiliary telescopic frame includes a first auxiliary support arm and a second auxiliary support arm. The middle of the first auxiliary support arm is pivotally connected to the first main support arm, and the middle of the second auxiliary support arm is pivotally connected to the second main support arm. The first main support arm, the second main support arm, the first auxiliary support arm, and the second auxiliary support arm form a scissor telescopic structure; A first transition wheel is rotatably connected to the middle of the first auxiliary support arm or the second auxiliary support arm. The first transition wheel is connected to the second upper belt pulley, the second middle belt pulley, or the second lower belt pulley through a first belt; One end of the first auxiliary support arm and the second auxiliary support arm are pivotally connected, and a second transition wheel is rotatably connected at the pivotal connection. The second transition wheel is connected to the first transition wheel through a second belt; The other end of the first auxiliary support arm is rotatably connected to a first auxiliary conveying roller. One end of the first auxiliary conveying roller is fixedly connected to a first auxiliary belt pulley. The first auxiliary belt pulley is connected to the second transition wheel through a third belt; The other end of the second auxiliary support arm is rotatably connected to a second auxiliary conveying roller. One end of the second auxiliary conveying roller is fixedly connected to a second auxiliary belt pulley. The second auxiliary belt pulley is connected to the second transition wheel through a fourth belt.

[0014] Further, limit plates are provided on both sides of the upper part of the main telescopic frame to limit the conveying trajectory of the goods on the upper conveying channel; A second guide groove is provided on the limit plate. Both ends of the upper conveying roller are rotatably connected to the limit plate. The pivotal connection of the first auxiliary support arm and the second auxiliary support arm is slidably installed in the second guide groove. A guide wheel is rotatably connected to the upper end of the limit plate.

[0015] Further, a material guiding mechanism is further included. The material guiding mechanism is arranged at the feeding end of the conveyor and / or the discharging end of the conveyor for docking with the feeding platform and / or the discharging platform. The material guiding mechanism includes a tray. U-shaped clamping plates are provided on both sides of the tray. The U-shaped clamping plates are buckled on the outside of the support frame. One side of the U-shaped clamping plate is threadedly connected with a fastening bolt. The end of the fastening bolt abuts against the side wall of the support frame; A slide plate is provided on the upper part of the tray. The slide plate is docked with the feeding platform and / or the discharging platform.

[0016] Even further, a plurality of material guiding roller cylinders are rotatably connected inside the slide plate.

[0017] Even further, through holes are provided on the tray. One end of the lower part of the slide plate is fixedly connected with a rotating shaft. The rotating shaft is in clearance fit with the through hole. A limit retaining ring is threadedly connected to the lower part of the rotating shaft; Baffle plates are provided on both sides of the tray. An activity gap is provided between the baffle plates and the slide plate.

[0018] The beneficial effects of the present invention are: 1) The upper conveying roller, the middle conveying roller, and the lower conveying roller of the present invention form a three-layer goods conveying channel, realizing the classified conveying of at least three kinds of goods by using one conveyor, reducing the occupied space of multiple conveyors, and improving the efficiency of classified goods conveying.

[0019] 2) By adjusting the height of the outriggers, not only the height matching between the conveyor and different platforms is achieved, but also obstacles such as ground bumps, small equipment, and temporarily stacked goods can be flexibly straddled, ensuring the continuity and stability of goods transportation.

[0020] 3) A telescopic mechanism is provided at the lower part of the side frame at one end. When the telescopic mechanism expands and contracts, it drives the slider to move up and down inside the side frame, thereby driving the lower conveying rollers at the end to move up and down, realizing the automatic telescoping of the conveyor and ensuring the stability of the conveyor after telescoping.

[0021] 4) By setting the driving mechanism and the transmission mechanism, the rotation of each conveying roller is realized, facilitating the long-distance, heavy-load, and high-frequency transportation of goods.

[0022] 5) A limit plate is provided at the upper part of the main telescopic frame, restricting the transportation trajectory of goods on the upper conveying channel and preventing goods from falling.

[0023] 6) By setting the auxiliary telescopic frame and linking the auxiliary telescopic frame with the main telescopic frame for telescoping, the gaps after stretching of the upper conveying rollers, middle conveying rollers, and lower conveying rollers are filled by the first auxiliary conveying rollers and the second auxiliary conveying rollers, effectively preventing goods from getting stuck between the conveying rollers or falling through the gaps between the conveying rollers during transportation, and improving the safety and reliability of goods transportation.

[0024] 7) By setting a rotatable material guiding mechanism, it is convenient to dock the import and export of goods from different positions. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a multi-layer telescopic roller conveyor of the present invention.

[0026] Figure 2 is a schematic diagram of the connection between the main telescopic frame and the support frame.

[0027] Figure 3 is a partial schematic diagram of the main transmission mechanism.

[0028] Figure 4 is a partial schematic diagram of the auxiliary transmission mechanism.

[0029] Figure 5 is a schematic diagram of the transmission of the upper conveying rollers, the first auxiliary conveying rollers, and the second auxiliary conveying rollers.

[0030] Figure 6 is a schematic diagram of the support frame.

[0031] Figure 7 is a schematic diagram of the limit plate.

[0032] Figure 8 is a schematic diagram of the telescopic mechanism.

[0033] Figure 9 It is an exploded view of the material guiding mechanism.

[0034] In the figure, 1 is the main telescopic frame; 101 is the first main support arm; 102 is the second main support arm; 103 is the upper conveying roller; 104 is the middle conveying roller; 105 is the lower conveying roller; 106 is the first upper belt pulley; 107 is the first middle belt pulley; 108 is the first lower belt pulley; 109 is the second upper belt pulley; 110 is the second middle belt pulley; 111 is the second lower belt pulley; 2 is the support frame; 201 is the leg; 202 is the adjustment hole; 203 is the caster; 204 is the sleeve; 205 is the side frame; 206 is the first guide groove; 207 is the telescopic mechanism; 208 is the telescopic rod; 209 is the slider; 3 is the auxiliary telescopic frame; 301 is the first auxiliary support arm; 302 is the second auxiliary support arm; 303 is the first auxiliary conveying roller; 304 is the second auxiliary conveying roller; 305 is the first auxiliary belt pulley; 306 is the second auxiliary belt pulley; 307 is the first idler pulley; 308 is the second idler pulley; 4 is the motor; 5 is the speed reducer; 6 is the limit plate; 601 is the second guide groove; 602 is the guide wheel; 7 is the material guiding mechanism; 701 is the sliding plate; 702 is the material guiding roller; 703 is the rotating shaft; 704 is the supporting plate; 705 is the baffle plate; 706 is the U-shaped clamping plate; 707 is the fastening bolt. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the attached Figures 1-9 drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0037] As Figure 1 , Figure 2 shown, a multi-layer telescopic roller conveyor includes a main telescopic frame 1 and a plurality of support frames 2, as Figure 3As shown, the main telescopic frame 1 includes multiple groups of first main support arms 101 and second main support arms 102. The middle parts of the first main support arms 101 and the second main support arms 102 are pivotally connected, and the ends of multiple first main support arms 101 and second main support arms 102 are sequentially pivotally connected. Multiple groups of first main support arms 101 and second main support arms 102 form a scissor telescopic structure, as Figure 2 As shown, at the pivot joint at the upper ends of the first main support arm 101 and the second main support arm 102, an upper layer conveyor roller 103 is rotatably connected. At the pivot joint in the middle of the first main support arm 101 and the second main support arm 102, a middle layer conveyor roller 104 is rotatably connected. At the pivot joint at the lower ends of the first main support arm 101 and the second main support arm 102, a lower layer conveyor roller 105 is rotatably connected. The upper layer conveyor roller 103, the middle layer conveyor roller 104, and the lower layer conveyor roller 105 form a three-layer cargo conveying channel, realizing the classified conveyance of at least three types of goods by using one conveyor, reducing the occupied space of multiple conveyors, and improving the efficiency of classified cargo conveyance.

[0038] The support frame 2 is arranged on both sides of the main telescopic frame 1 for supporting the main telescopic frame 1, as Figure 6 As shown, it includes legs 201. Casters 203 are provided at the lower part of the legs 201 for the movement of the conveyor. A side frame 205 is connected to the inner side of the legs 201. The upper layer conveyor roller 103 on one side of the side frame 205 is rotatably connected to the side frame 205. A first guide groove 206 is also provided on the side frame 205. The end of the lower layer conveyor roller 105 on one side of the side frame 205 is slidably installed in the first guide groove 206.

[0039] As Figure 6 shown, a sleeve 204 is fixedly connected to one side of the side frame 205. The legs 201 are installed in the sleeve 204 with a gap. A number of equally spaced adjustment holes 202 are provided on the legs 201. A pin is provided at the lower part of the sleeve 204 for adjusting the height of the legs 201.

[0040] In actual application scenarios, there are often differences in the heights of various platforms involved in cargo conveyance, such as the shelf platforms in different warehouses, the operation platforms on different production lines, etc. In this technical solution, by providing a number of equally spaced adjustment holes 202 on the legs 201 and using the pin at the lower part of the sleeve 204 for height adjustment, the conveyor can be easily and accurately adjusted to a height matching different height platforms, improving the versatility of the conveyor.

[0041] In addition, by adjusting the height of the legs 201, this conveyor can flexibly cross obstacles such as ground protrusions, small equipment, and temporarily stacked goods, ensuring the continuity and stability of cargo conveyance.

[0042] As Figure 6As shown in the figure, a telescopic mechanism 207 is provided at the lower part of the side frame 205 at one end. A slider 209 is connected to the end of the telescopic rod 208 of the telescopic mechanism 207. The lower conveying roller 105 is rotatably connected to the slider 209. When the telescopic mechanism 207 expands and contracts, it drives the slider 209 to move up and down inside the side frame 205, thereby driving the lower conveying roller 105 at the end to move up and down, realizing the automatic expansion and contraction of the conveyor, and ensuring the stability of the conveyor after expansion and contraction.

[0043] The telescopic mechanism 207 adopts one of a cylinder, a hydraulic cylinder or an electric cylinder. In this embodiment, as Figure 8 shown, the telescopic mechanism 207 adopts an electric cylinder.

[0044] The unpowered roller conveyor is suitable for short-distance, light-load, and low-frequency cargo transportation, such as material handling in warehouses and workshops; while the powered roller conveyor is suitable for long-distance, heavy-load, and high-frequency material transportation, such as material flow on production lines and cargo sorting in logistics centers. In order to achieve the powered transportation of goods, the present invention further includes a driving mechanism, as Figure 2 shown, the driving mechanism includes a motor 4 installed on the support frame 2 at one end. A speed reducer 5 is connected to one side of the motor 4. The output shaft of the speed reducer 5 is connected to the upper conveying roller 103 at one end of the main telescopic frame 1. A transmission mechanism is provided on one side of the main telescopic frame 1, as Figure 3 shown, the transmission mechanism includes a first upper belt pulley 106 installed at one end of the upper conveying roller 103, a first middle belt pulley 107 installed at one end of the middle conveying roller 104, and a first lower belt pulley 108 installed at one end of the lower conveying roller 105. A plurality of first upper belt pulleys 106, first middle belt pulleys 107, and first lower belt pulleys 108 on one side of the main telescopic frame 1 are sequentially connected by a transmission belt. The motor 4 and the speed reducer 5 in the driving mechanism drive the upper conveying roller 103, the middle conveying roller 104, and the lower conveying roller 105 on the main telescopic frame 1 to rotate, realizing the long-distance, heavy-load, and high-frequency transportation of goods.

[0045] As Figure 4 、 Figure 5 shown, a second upper belt pulley 109 is fixedly connected to one end of the upper conveying roller 103, a second middle belt pulley 110 is fixedly connected to one end of the middle conveying roller 104, and a second lower belt pulley 111 is fixedly connected to one end of the lower conveying roller 105; On both sides of the upper conveying roller 103, the middle conveying roller 104, and the lower conveying roller 105, there are secondary telescopic frames 3. The secondary telescopic frame 3 includes a first secondary support arm 301 and a second secondary support arm. The middle of the first secondary support arm 301 is pivotally connected to the first main support arm 101, and the middle of the second secondary support arm 302 is pivotally connected to the second main support arm 102. The first main support arm 101, the second main support arm 102, the first secondary support arm 301, and the second secondary support arm 302 form a scissor telescopic structure; At the middle of the first secondary support arm 301 or the second secondary support arm 302, there is a first transition wheel 307 rotatably connected. The first transition wheel 307 is connected to the second upper belt pulley 109 or the second middle belt pulley 110 or the second lower belt pulley 111 through a first belt; One end of the first secondary support arm 301 and the second secondary support arm 302 are pivotally connected, and at the pivot connection, there is a second transition wheel 308 rotatably connected. The second transition wheel 308 is connected to the first transition wheel 307 through a second belt; The other end of the first secondary support arm 301 is rotatably connected to a first auxiliary conveying roller 303. One end of the first auxiliary conveying roller 303 is fixedly connected to a first auxiliary belt pulley 305. The first auxiliary belt pulley 305 is connected to the second transition wheel 308 through a third belt; The other end of the second secondary support arm 302 is rotatably connected to a second auxiliary conveying roller 304. One end of the second auxiliary conveying roller 304 is fixedly connected to a second auxiliary belt pulley 306. The second auxiliary belt pulley 306 is connected to the second transition wheel 308 through a fourth belt.

[0046] When the main telescopic frame 1 expands and contracts, it drives the secondary telescopic frame 3 to expand and contract synchronously, thereby driving the first auxiliary conveying roller 303 and the second auxiliary conveying roller 304 to expand and contract synchronously, filling the gaps between adjacent upper conveying rollers 103, middle conveying rollers 104, and lower conveying rollers 105, effectively preventing goods from getting stuck between the conveying rollers or falling through the gaps between the conveying rollers during transportation. For example, when transporting small goods, the secondary telescopic frame 3 can ensure that the goods pass through the conveyor smoothly and steadily, reducing the risk of goods damage and loss, and greatly improving the safety and reliability of goods transportation.

[0047] As Figure 4 、 Figure 7 As shown, on both sides of the upper part of the main telescopic frame 1, there are limit plates 6 for restricting the transportation trajectory of goods on the upper transportation channel to prevent goods from falling; There is a second guide groove 601 on the limit plate 6. The two ends of the upper conveying roller 103 are rotatably connected to the limit plate 6, and the pivot connection of the first secondary support arm 301 and the second secondary support arm 302 is slidably installed in the second guide groove 601. A guide wheel 602 is rotatably connected to the upper end of the limit plate 6, reducing the friction between the goods and the limit plate 6 and ensuring the stability and smoothness of goods transportation.

[0048] As Figure 1 、 Figure 9As shown, it further includes a material guiding mechanism 7. The material guiding mechanism 7 is arranged at the feeding end and / or the discharging end of the conveyor, and is used to dock with the feeding platform and / or the discharging platform. The material guiding mechanism 7 includes a pallet 704. U-shaped clamping plates 706 are arranged on both sides of the pallet 704. The U-shaped clamping plates 706 are buckled on the outer side of the support frame 2. One side of the U-shaped clamping plate 706 is threadedly connected with a fastening bolt 707. The end of the fastening bolt 707 abuts against the side wall of the support frame 2 to realize the position adjustment and fixation of the material guiding mechanism 7 and the support frame 2. A slide plate 701 is arranged on the upper part of the pallet 704. The slide plate 701 docks with the feeding platform and / or the discharging platform.

[0049] As Figure 9 shown, a plurality of material guiding rollers 702 are rotatably connected inside the slide plate 701, reducing the friction of the goods in the slide plate 701 and improving the smoothness of the goods entering and leaving the conveyor.

[0050] As Figure 9 shown, through holes are arranged on the pallet 704. One end of the lower part of the slide plate 701 is fixedly connected with a rotating shaft 703. The rotating shaft 703 is in clearance fit with the through hole. A limit retaining ring is threadedly connected to the lower part of the rotating shaft 703 to prevent the rotating shaft 703 from separating from the pallet 704. The rotating shaft 703 enables the angle between the slide plate 701 and the pallet 704 to be adjustable, facilitating the conveyance of goods at different positions, reducing the frequency of conveyor position adjustment, and improving the flexibility of the conveyor. Baffle plates 705 are arranged on both sides of the pallet 704 to prevent the goods from falling off the pallet 704 after the position between the slide plate 701 and the pallet 704 is adjusted. An active gap is arranged between the baffle plate 705 and the slide plate 701, which can not only meet the need for angle adjustment of the slide plate 701, but also limit the adjusted angle of the slide plate 701.

[0051] The above content is only an example and description of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the scope defined by the structure of the invention, they should fall within the protection scope of the present invention.

Claims

1. A multi-layer telescopic roller conveyor, comprising: A main telescopic frame, the main telescopic frame includes multiple groups of first main support arms and second main support arms, the middle parts of the first main support arms and the second main support arms are pivotally connected, the ends of multiple first main support arms and second main support arms are sequentially pivotally connected, and multiple groups of first main support arms and second main support arms form a scissor telescopic structure. It is characterized in that upper conveying rollers are rotatably connected at the pivotal joints at the upper ends of the first main support arms and the second main support arms, middle conveying rollers are rotatably connected at the pivotal joints in the middle parts of the first main support arms and the second main support arms, and lower conveying rollers are rotatably connected at the pivotal joints at the lower ends of the first main support arms and the second main support arms; the upper conveying rollers, the middle conveying rollers and the lower conveying rollers form a three-layer cargo conveying channel; It further includes multiple support frames, which are arranged on both sides of the main telescopic frame and are used to support the main telescopic frame. The support frames include legs, casters are provided at the lower parts of the legs, side frames are connected to the inner sides of the legs, the upper conveying rollers on one side of the side frames are rotatably connected to the side frames, and first guide grooves are further provided on the side frames, and the ends of the lower conveying rollers on one side of the side frames are slidably installed in the first guide grooves.

2. The multi-layer telescopic roller conveyor according to claim 1, wherein, A sleeve is fixedly connected to one side of the side frame, the leg is installed in the sleeve with a gap, and a number of adjustment holes are provided at equal intervals on the leg, and a pin is provided at the lower part of the sleeve for adjusting the height of the leg.

3. A multi-layer telescopic roller conveyor according to claim 1, characterized in that, A telescopic mechanism is provided at the lower part of the side frame at one end, a slider is connected to the end of the telescopic rod of the telescopic mechanism, and the lower conveying roller is rotatably connected to the slider; when the telescopic mechanism expands and contracts, it drives the slider to move up and down inside the side frame, thereby driving the lower conveying roller at the end to move up and down.

4. The multi-layer telescopic roller conveyor according to claim 3, characterized in that, The telescopic mechanism adopts one of a cylinder, a hydraulic cylinder or an electric cylinder.

5. A multi-layer telescopic roller conveyor according to any one of claims 1-4, characterized in that, It further includes a driving mechanism, the driving mechanism includes a motor installed on the support frame at one end, a speed reducer is connected to one side of the motor, the output shaft of the speed reducer is connected to the upper conveying roller at one end of the main telescopic frame, and a transmission mechanism is provided on one side of the main telescopic frame. The transmission mechanism includes a first upper belt pulley installed at one end of the upper conveying roller, a first middle belt pulley installed at one end of the middle conveying roller, and a first lower belt pulley installed at one end of the lower conveying roller. Multiple first upper belt pulleys, first middle belt pulleys and first lower belt pulleys on one side of the main telescopic frame are sequentially connected by a transmission belt.

6. The multi-layer telescopic roller conveyor according to claim 5, characterized in that, A second upper belt pulley is fixedly connected to one end of the upper conveying roller, a second middle belt pulley is fixedly connected to one end of the middle conveying roller, and a second lower belt pulley is fixedly connected to one end of the lower conveying roller; Auxiliary telescopic frames are provided on both sides of the upper conveying roller, the middle conveying roller and the lower conveying roller. The auxiliary telescopic frame includes a first auxiliary support arm and a second auxiliary support arm. The middle part of the first auxiliary support arm is pivotally connected to the first main support arm, and the middle part of the second auxiliary support arm is pivotally connected to the second main support arm. The first main support arm, the second main support arm, the first auxiliary support arm and the second auxiliary support arm form a scissor telescopic structure; A first intermediate pulley is rotatably connected to the middle of the first auxiliary support arm or the second auxiliary support arm. The first intermediate pulley is connected to the second upper pulley, or the second middle pulley, or the second lower pulley through a first belt. One ends of the first auxiliary support arm and the second auxiliary support arm are pivotally connected, and a second intermediate pulley is rotatably connected at the pivotal connection. The second intermediate pulley is connected to the first intermediate pulley through a second belt. The other end of the first auxiliary support arm is rotatably connected to a first auxiliary conveying roller. One end of the first auxiliary conveying roller is fixedly connected to a first auxiliary pulley. The first auxiliary pulley is connected to the second intermediate pulley through a third belt. The other end of the second auxiliary support arm is rotatably connected to a second auxiliary conveying roller. One end of the second auxiliary conveying roller is fixedly connected to a second auxiliary pulley. The second auxiliary pulley is connected to the second intermediate pulley through a fourth belt.

7. A multi-layer telescopic roller conveyor according to claim 6, characterized in that, Limit plates are provided on both sides of the upper part of the main telescopic frame for restricting the conveying trajectory of the goods on the upper conveying channel. Second guide grooves are provided on the limit plates. Both ends of the upper conveying roller are rotatably connected to the limit plates. The pivotal connection of the first auxiliary support arm and the second auxiliary support arm is slidably installed in the second guide grooves. Guide wheels are rotatably connected to the upper ends of the limit plates.

8. A multi-layer telescopic roller conveyor according to claim 1, characterized in that, It further includes a feeding guide mechanism. The feeding guide mechanism is arranged at the feeding end of the conveyor and / or the discharging end of the conveyor for docking with the feeding platform and / or the discharging platform. The feeding guide mechanism includes a support plate. U-shaped clamping plates are provided on both sides of the support plate. The U-shaped clamping plates are buckled on the outer side of the support frame. A fastening bolt is threadedly connected to one side of the U-shaped clamping plate. The end of the fastening bolt abuts against the side wall of the support frame. A chute is provided on the upper part of the support plate. The chute is docked with the feeding platform and / or the discharging platform.

9. The multi-layer telescopic roller conveyor according to claim 8, characterized in that, A plurality of feeding guide rollers are rotatably connected inside the chute.

10. A multi-layer telescopic roller conveyor according to claim 8, characterized in that, Through holes are provided on the support plate. A rotating shaft is fixedly connected to the lower part of one end of the chute. The rotating shaft is in clearance fit with the through hole. A limit retaining ring is threadedly connected to the lower part of the rotating shaft. Baffle plates are provided on both sides of the support plate. An active gap is provided between the baffle plates and the chute.

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