Variable-pitch double-layer elevator and conveying system comprising same

Abstract

The utility model discloses a variable-pitch double-layer elevator and a conveying system comprising the variable-pitch double-layer elevator, the variable-pitch double-layer elevator comprises a driving unit, a lifting unit and a frame unit, the driving unit drives the lifting unit to move up and down in the frame unit, and the lifting unit comprises a double-layer lifting frame, a first conveyor, a second conveyor and a variable-pitch mechanism; the first conveyor and the second conveyor are arranged on the double-layer lifting frame in an up-down spaced mode, and the distance changing mechanism can change the vertical distance between the conveying plane of the first conveyor and the conveying plane of the second conveyor so that the distance changing mechanism and external double-layer feeding and discharging conveying line bodies with different layer distances can form a conveying system. The vertical distance between the upper conveyor and the lower conveyor of the double-layer lifting frame is changed through the distance changing mechanism, the layer distance of an original double-layer conveying line body does not need to be changed, cost is saved, meanwhile, operation of the distance changing mechanism and operation of the driving unit are conducted synchronously, the conveying takt is accelerated, and the conveying efficiency is improved.

Description

Technical Field

[0001] The present application is applied to the field of automated transportation, and specifically relates to a variable-pitch double-deck elevator and a transportation system including the same. Background Art

[0002] Double-layer conveyor lines are common in the field of automated conveying. They can simultaneously transport loads on two layers of conveyor lines, saving horizontal space and improving conveying efficiency. In the process of conveying multiple sections of double-layer conveyor lines at different heights, a double-layer elevator is required to complete the docking of multiple sections of double-layer conveyor lines at different heights and complete the loading and unloading of loads. In the prior art, multiple sections of double-layer conveyor lines at different heights have different heights of the upper and lower layers of the conveyor lines. If they are used in the same conveying system, the upper and lower layer spacing of each section of the double-layer conveyor line needs to be adjusted to the same, which is extremely costly. Alternatively, a single-layer elevator is used to separately transport the different upper and lower layers of the conveyor lines, which reduces conveying efficiency. Summary of the Invention

[0003] In view of the above reasons, the present application discloses a variable-pitch double-layer elevator, including a drive unit, a lifting unit and a frame unit. The drive unit drives the lifting unit to move up and down within the frame unit. The lifting unit includes a double-layer lifting frame, a first conveyor, a second conveyor and a variable-pitch mechanism. The first conveyor and the second conveyor are respectively arranged at intervals of up and down on the double-layer lifting frame. The variable-pitch mechanism can change the vertical spacing between the conveying planes of the first conveyor and the second conveyor.

[0004] Preferably, the driving unit includes a driving motor, a driving wheel, a driven wheel and a driving belt, the driving wheel and the driven wheel are respectively arranged at relative positions at the upper and lower ends of the frame unit, the driving belt is sleeved between the driving wheel and the driven wheel, the driving motor drives the driving wheel to rotate, and one side of the driving belt is fixedly connected to the double-layer lifting frame.

[0005] Preferably, the variable distance mechanism includes a jacking assembly, and the jacking assembly includes a jacking cylinder and a fixed plate. The fixed plate is fixedly connected to the lower layer of the double-layer lifting frame, the fixed end of the jacking cylinder is fixedly connected to the fixed plate, and the free end of the jacking cylinder is fixedly connected upward to the second conveyor. The jacking cylinder drives the second conveyor to move up and down in the vertical direction relative to the first conveyor.

[0006] Preferably, the lifting assembly further includes a linear bearing and a guide rod, the linear bearing being fixedly provided on the fixed plate in a vertical direction, one end of the guide rod being fixedly connected to the second conveyor, and the other end of the guide rod being provided through the linear bearing.

[0007] Preferably, the jacking assembly also includes a limit buffer assembly, which includes a guide rod connecting plate, an adjustment bolt and a buffer member. The guide rod connecting plate is fixedly connected to the other end of the guide rod, and the adjustment bolt and the buffer are arranged in the direction of the guide rod connecting plate relative to the second conveyor.

[0008] Preferably, the variable distance mechanism includes an electric cylinder, the double-layer lifting frame includes an upper lifting frame and a lower lifting frame, the upper lifting frame and the lower lifting frame are arranged at intervals in the vertical direction, the fixed end of the electric cylinder is fixedly connected to the upper lifting frame, and the free end of the electric cylinder is connected to the lower lifting frame, and the electric cylinder drives the lower lifting frame to move up and down in the vertical direction relative to the upper lifting frame.

[0009] Preferably, the lifting unit also includes a counterweight assembly, which includes a counterweight plate, a guide wheel and a first guide rail. The first guide rail is arranged at a relative position on one side of the frame unit in the vertical direction, and the guide wheels are arranged on both sides of the counterweight plate. The guide wheels are slidably connected to the first guide rail, and the counterweight plate is fixedly connected to the other side of the drive belt.

[0010] Preferably, it also includes a maintenance limit assembly, which includes an electric control sensor, a latch limit assembly and a latch, and the electric control sensor and the latch limit assembly are arranged on the frame unit. When the latch is fully inserted into the latch fixing member, the electric control sensor controls the drive motor to stop running.

[0011] The present application also discloses a conveying system, including a double-layer feeding conveyor line, a double-layer discharging conveyor line and any one of the above-mentioned variable-pitch double-layer elevators, wherein the double-layer feeding conveyor line is connected to the feeding end of the variable-pitch double-layer elevator, and the double-layer discharging conveyor line is connected to the discharging end of the variable-pitch double-layer elevator.

[0012] Preferably, the double-layer feeding conveyor line body includes a first feeding conveyor line and a second feeding conveyor line stacked up and down, and the double-layer discharging conveyor line body includes a first discharging conveyor line and a second discharging conveyor line stacked up and down, and the conveying plane spacing between the first feeding conveyor line and the second feeding conveyor line is different from the conveying plane spacing between the first discharging conveyor line and the second discharging conveyor line.

[0013] The advantage of this application is that the vertical distance between the upper and lower conveyors of the double-layer lifting frame is changed by a variable distance mechanism to adapt to the external double-layer feeding conveyor line and the double-layer discharging conveyor line with different layer spacings. There is no need to change the layer spacing of the original double-layer conveyor line, which saves costs. At the same time, the operation of the variable distance mechanism is synchronized with the operation of the drive unit, which speeds up the conveying rhythm and improves the conveying efficiency.

[0014] Other specific features and specific advantages of the present application will be described in the subsequent description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by practicing the above-mentioned technology of the present disclosure.

[0015] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of an embodiment of a variable pitch double-deck elevator of the present application.

[0018] Figure 2 This is a structural diagram of an embodiment of a variable pitch double-deck elevator of the present application.

[0019] Figure 3 This is a side view of an embodiment of the variable pitch double-deck elevator of the present application.

[0020] Figure 4 for Figure 2 Enlarged view of part A.

[0021] Figure 5 This is a structural diagram of another embodiment of the variable pitch double-deck elevator of the present application.

[0022] Figure 6 This is a side view of another embodiment of the variable pitch double-deck elevator of the present application.

[0023] Figure 7 This is a partial structural diagram of another embodiment of the variable-pitch double-deck elevator of the present application.

[0024] Figure 8 This is a structural diagram of an embodiment of the conveying system of the present application.

[0025] Figure 9 This is a structural diagram of another embodiment of the conveying system of the present application.

[0026] In the figure: 1. frame; 2. double-layer lifting frame; 201. upper lifting frame; 202. lower lifting frame; 3. first conveyor; 4. second conveyor; 5. driving motor; 6. driving wheel; 7. driven wheel; 8. driving belt; 9. connecting block; 10. fixing plate; 11. lifting cylinder; 12. linear bearing; 13. guide rod; 14. guide rod connecting plate; 15. adjusting bolt; 16. buffer; 17. electric cylinder; 18. second guide rail; 19. slider; 20. impact block; 21. counterweight plate; 22. guide wheel; 23. first guide rail; 24. electric control sensor; 25. latch limiter; 26. latch; 27. first feeding conveyor line; 28. second feeding conveyor line; 29. ​​first discharging conveyor line; 30. second discharging conveyor line. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figures 1 to 3 As shown, the frame unit is a rectangular frame 1 formed by a plurality of frame profiles. A lifting unit and a driving unit are provided in the frame unit. The driving unit drives the lifting unit to move up and down in the frame unit. The lifting unit includes a double-layer lifting frame 2, a first conveyor 3, a second conveyor 4 and a pitch-changing mechanism. The first conveyor 3 is arranged on the upper layer of the double-layer lifting frame 2, and the second conveyor 4 is arranged on the lower layer of the double-layer lifting frame 2. The first conveyor 3 and the second conveyor 4 are both conveying mechanisms for horizontal conveying, which can be conventional conveyor mechanisms such as roller conveyors, chain conveyors or belt conveyors. The first conveyor 3 and the second conveyor 4 are arranged at upper and lower intervals on the double-layer lifting frame 2. The first conveyor 3 and the second conveyor 4 each have a power mechanism, which can complete the horizontal conveying of the load. The pitch-changing mechanism can change the vertical spacing between the conveying planes of the first conveyor 3 and the second conveyor 4 to meet the use requirements of the double-layer conveyor line body for feeding and discharging materials with different layer spacings.

[0029] In some embodiments, as Figures 1 to 3As shown, the drive unit includes a drive motor 5, a drive wheel 6, a driven wheel 7 and a drive belt 8. The drive wheel 6 and the driven wheel 7 are respectively arranged at the lower end and the upper end of the frame 1. Specifically, the drive wheel 6 and the driven wheel 7 are arranged on the same side of the frame, and the upper and lower positions of the drive wheel 6 and the driven wheel 7 are relative. The drive belt 8 is sleeved between the drive wheel 6 and the driven wheel 7. The drive wheel 6 is driven to rotate by the drive motor 5, thereby driving the drive belt 8 to rotate between the drive wheel 6 and the driven wheel 7. One side surface of the drive belt 8 is fixedly connected to one side of the double-layer lifting frame 2, specifically, it can be connected through a connecting block 9. The drive motor 5 rotates forward or reverse, so that the drive belt 8 drives the double-layer lifting frame 2 to move up and down in the vertical direction. It should be noted that, due to load and stability requirements, the drive wheel 6, the driven wheel 7 and the drive belt 8 can be arranged in parallel in multiple groups, which is not limited here.

[0030] In some embodiments, as Figures 1 to 3 As shown, the variable distance mechanism is a lifting component, which includes a fixed plate 10 and a lifting cylinder 11. The fixed plate 10 is arranged on the lower layer of the double-layer lifting frame 2, and the fixed end of the lifting cylinder 11 is fixedly connected to the fixed plate 10. The free end of the lifting cylinder 11 is vertically upward, and the free end is fixedly connected to the lower surface of the second conveyor 4. When the free end of the lifting cylinder 11 is in a recovered state, the second conveyor 4 is placed above the fixed plate 10, and the vertical spacing between the conveying planes of the first conveyor 3 and the second conveyor 4 is at the maximum spacing. When the free end of the lifting cylinder 11 is in an extended state, the second conveyor 4 rises relative to the lower layer of the double-layer lifting frame 2, and the lower end of the second conveyor 4 leaves the fixed plate 10. The vertical spacing between the conveying planes of the first conveyor 3 and the second conveyor 4 becomes smaller. The specific extension height can be determined according to the layer spacing of the double-layer conveying line body docked externally according to actual needs.

[0031] It should be noted that the jacking component can also be set to act on the first conveyor 3, and the first conveyor 3 can be lifted in the vertical direction by the jacking component, thereby changing the vertical distance between the conveying planes of the first conveyor 3 and the second conveyor 4. The layer distance between the upper and lower layers of the double-layer lifting frame 2 must meet the minimum required docking layer height.

[0032] In some embodiments, as Figures 1 to 3As shown, the lifting assembly also includes a linear bearing 12 and a guide rod 13. The length direction of the linear bearing 12 is vertical. The linear bearing 12 is fixedly installed in the fixed plate 10. The linear bearing 12 is placed below the second conveyor 4. The upper end of the guide rod 13 is fixedly connected to the lower surface of the second conveyor 4. The other end of the guide rod 13 passes through the linear bearing 12. When the second conveyor 4 moves up and down under the drive of the lifting cylinder 11, the guide rod 13 also moves up and down in the linear bearing 12. The linear bearing 12 cooperates with the guide rod 13 to play an auxiliary guiding role for the second conveyor 4 in the vertical direction, while preventing the free end of the lifting cylinder 11 from being subjected to radial force, thereby improving the service life of the lifting cylinder 11. The linear bearing 12 and the guide rod 13 can be multiple groups, and the specific number of groups is not limited here.

[0033] In some embodiments, as Figures 1 to 3 As shown, the jacking assembly also includes a limit buffer assembly, which includes a guide rod connecting plate 14, an adjusting bolt 15 and a buffer member 16. The guide rod connecting plate 14 is fixedly arranged at the lower end of the guide rod 13. The guide rod connecting plate 14 can prevent the second conveyor 4 from being lifted upward too much. The guide rod connecting plate 14 is limited to the bottom of the linear bearing 12. An adjusting bolt 15 is provided on the upper surface of the guide rod connecting plate 14. The adjusting bolt 15 is provided just below the fixed end of the jacking cylinder. The adjusting bolt 15 can change the vertical height of its upper end relative to the plane of the guide rod connecting plate 14 by rotating itself. When the second conveyor 4 is at its maximum upward stroke, the upper end of the adjusting bolt 15 contacts the lower end of the fixed end of the jacking cylinder 11, thereby limiting the maximum upward stroke of the second conveyor 4, and further limiting the maximum distance between the conveying planes of the first conveyor 3 and the second conveyor 4. The buffer member 16 can be a buffer block made of elastic nylon material, or it can be a flexible buffer. This application takes the flexible buffer as an example. When the second conveyor 4 moves upward to the maximum upper stroke under the action of the jacking cylinder 11, the top of the flexible buffer contacts the fixed end of the jacking cylinder 11, thereby ensuring a flexible stop of the jacking process.

[0034] In some embodiments, as Figures 5 to 7As shown, the double-layer lifting frame 2 includes an upper lifting frame 201 and a lower lifting frame 202. The upper lifting frame 201 and the lower lifting frame 202 are arranged at an upper and lower interval in the vertical direction. The first conveyor 3 is fixedly arranged on the upper lifting frame 201, and the second conveyor 4 is fixedly arranged on the lower lifting frame 202. The upper lifting frame 201 and the lower lifting frame 202 are connected by a variable pitch mechanism. The variable pitch mechanism is an electric cylinder 17. The electric cylinder 17 is a modular product integrating a servo motor and a lead screw. The fixed end of the electric cylinder 17, that is, the servo motor end, is fixedly connected to the upper lifting frame 201, and the free end of the electric cylinder 17 is connected to the lower lifting frame 202 through a connecting piece. When the free end of the electric cylinder 17 is in the retracted state, the distance between the conveying planes of the first conveyor 3 and the second conveyor 4 is at the minimum distance. When the free end of the electric cylinder 17 is in the extended state, the lower lifting frame 202 is vertically downwardly displaced relative to the upper lifting frame 201. The second conveyor 4 is vertically downwardly displaced relative to the first conveyor 3 driven by the lower lifting frame 202. The distance between the conveying planes of the first conveyor 3 and the second conveyor 4 becomes larger. The specific extension height can be determined according to the actual needs of the layer spacing of the double-layer conveyor line body docked on the outside. Compared with the jacking cylinder 11, the electric cylinder 17 has a faster response speed and higher control accuracy.

[0035] In some embodiments, as Figures 1 to 4 As shown, a second guide rail 18 is provided on the vertical profile of the frame 1 near the side of the drive ring belt. The length direction of the second guide rail 18 is perpendicular to the ground direction. When the pitch-changing mechanism is an embodiment including the jacking cylinder 11, sliders 19 are provided on both sides of the double-layer lifting frame 2. The sliders 19 are slidably connected with the second guide rail 18. When the pitch-changing mechanism is an embodiment including the electric cylinder 17, sliders 19 are provided on both sides of the upper lifting frame 201 and the lower lifting frame 202. The sliders 19 are slidably connected with the second guide rail 18. The sliders 19 and the second guide rail 18 play an auxiliary guiding role. The upper and lower ends of the second guide rail 18 are provided with bumpers 20, which can contact the double-layer lifting frame 2 to prevent the double-layer lifting frame 2 from over-operating.

[0036] In some embodiments, as Figures 1 to 4The figure also includes a counterweight assembly, which includes a counterweight plate 21, a guide wheel 22 and a first guide rail 23. The first guide rail 23 is arranged on the vertical frame profile on the side where the drive belt 8 is located. The length direction of the first guide rail 23 is vertical. Free guide wheels 22 are provided on both sides of the counterweight plate 21. The guide wheels 22 slide with the first guide rails 23 on the corresponding side, so that the counterweight plate 21 can be displaced up and down in the vertical direction. The other side surface of the drive belt 8 is fixedly connected to the counterweight plate 21. When the double-layer lifting frame 2 moves upward, the counterweight plate 21 moves on the drive belt 8. The counterweight plate 21 is driven to move downward synchronously, that is, the counterweight plate 21 and the lifting unit have opposite movement trends. The counterweight assembly is used to balance the weight of the lifting unit, thereby reducing the shaking of the lifting unit during the lifting process. The weight of the counterweight plate 21 is determined by the weight of the lifting unit and the load on the lifting unit. It can be dynamically adjusted by adding or removing additional auxiliary counterweight blocks, which improves stability and reduces the demand for the maximum torque of the drive motor 5. The upper and lower positions of the first guide rail 23 can be provided with collision blocks 20 to prevent the counterweight plate 21 from running over by over-contact with the counterweight plate 21.

[0037] In some embodiments, as Figures 1 to 4 As shown, it also includes a maintenance limit assembly, which includes an electric control sensor 24, a latch limit 25 and a latch 26. The electric control sensor 24 and the latch limit 25 are arranged on one side of the frame. The electric control sensor 24 is used to receive the contact signal and control the drive motor 5 according to the signal. The latch limit 25 has a latch hole. When the latch 26 is fully inserted into the latch hole, the electric control sensor 24 will receive the contact signal and control the drive motor 5 to stop running. It is suitable for preventing the double-deck elevator from running out of control and causing harm to maintenance personnel in the maintenance state. The latch 26 can only be inserted into the latch limit 25 at a fixed angle, which effectively prevents misoperation.

[0038] The present application discloses a delivery system, such as Figure 8 and Figure 9 As shown, it includes a feeding double-layer conveyor line body on the feeding side relative to the double-layer elevator and a discharging double-layer conveyor line body relative to the double-layer elevator. The feeding double-layer conveyor line body and the discharging double-layer conveyor line body are docked and connected by the double-layer elevator with variable layer spacing disclosed in this application. The conveying plane height of the feeding double-layer conveyor line body is different from the conveying plane height of the discharging double-layer conveyor line body. The feeding double-layer conveyor line body includes a first feeding conveyor line 27 and a second feeding conveyor line 28 stacked at an interval up and down. The discharging double-layer conveyor line body includes a first discharging conveyor line 29 and a second discharging conveyor line 30 stacked at an interval up and down. The distance between the conveying plane of the first feeding conveyor line 27 and the conveying plane of the second feeding conveyor line 28 is D1, and the distance between the conveying plane of the first discharging conveyor line 29 and the conveying plane of the second discharging conveyor line 30 is D2, and D1 is different from D2.

[0039] In some embodiments, as Figure 8 As shown, the overall height of the discharge double-layer conveyor line body is higher than that of the feed double-layer conveyor line body, and the height of the discharge end is higher than that of the feed end. When a number of loads are respectively located on the first feed conveyor line 27 and the second feed conveyor line 28, and are transported down to the feed end of the double-layer elevator on the first feed conveyor line 27 and the second feed conveyor line 28, the double-layer elevator frame 2 is placed in the lower stroke position under the action of the drive motor 5, the jacking cylinder 11 is in the recovery position, the second conveyor 4 is in the lower stroke position, the conveying plane of the first conveyor 3 is at the same height as the conveying plane of the first feed conveyor line 27, and the conveying plane of the second conveyor 4 is at the same height as the conveying plane of the second feed conveyor line 28, and the loads enter the first feed conveyor line 27 and the second feed conveyor line 28 respectively. The conveyor 3 and the second conveyor 4, the driving motor 5 drives the double-layer lifting frame 2 to move upward, and at the same time the free end of the lifting cylinder 11 extends out, driving the second conveyor 4 to be vertically lifted upward relative to the first conveyor 3, until the vertical height distance between the conveying plane of the first conveyor 3 and the conveying plane of the second conveyor 4 is equal to D2. When the driving motor 5 drives the conveying plane height of the first conveyor 3 to be the same as the conveying plane height of the first discharging conveyor line 29, the conveying plane height of the second conveyor 4 is also the same as the conveying plane of the second discharging conveyor line 30. Under the action of the first conveyor 3 and the second conveyor 4, the load enters the first discharging conveyor line 29 and the second discharging conveyor line 30 accordingly.

[0040] In some embodiments, as Figure 9 As shown, the overall height of the discharge double-layer conveyor line body is higher than that of the feed double-layer conveyor line body. When a number of loads are respectively located on the first feed conveyor line 27 and the second feed conveyor line 28, and are transported down to the feed end of the double-layer elevator by the first feed conveyor line 27 and the second feed conveyor line 28, the double-layer elevator frame 2 is placed in the downstroke position under the action of the drive motor 5, the free end of the electric cylinder 17 is in the extended position, the second conveyor 4 is in the downstroke position, the conveying plane of the first conveyor 3 is at the same height as the conveying plane of the first feed conveyor line 27, the conveying plane of the second conveyor 4 is at the same height as the conveying plane of the second feed conveyor line 28, and the vertical height distance between the conveying plane of the first conveyor 3 and the conveying plane of the second conveyor 4 is equal. At D1, the load enters the first conveyor 3 and the second conveyor 4 respectively, and the driving motor 5 drives the double-layer lifting frame 2 to move upward. At the same time, the free end of the electric cylinder 17 drives the second conveyor 4 to be pulled vertically upward relative to the first conveyor 3, until the vertical height distance between the conveying plane of the first conveyor 3 and the conveying plane of the second conveyor 4 is equal to D2. When the driving motor 5 drives the conveying plane height of the first conveyor 3 to be the same as the conveying plane height of the first discharging conveyor line 29, the conveying plane height of the second conveyor 4 is also the same as the conveying plane of the second discharging conveyor line 30. Under the action of the first conveyor 3 and the second conveyor 4, the load enters the first discharging conveyor line 29 and the second discharging conveyor line 30 respectively.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the scope of protection of the present application.

Claims

1. A variable pitch double-deck elevator, characterized in that: It includes a driving unit, a lifting unit and a frame unit. The driving unit drives the lifting unit to move up and down in the frame unit. The lifting unit includes a double-layer lifting frame, a first conveyor, a second conveyor and a distance-changing mechanism. The first conveyor and the second conveyor are respectively arranged at intervals on the double-layer lifting frame. The distance-changing mechanism can change the vertical distance between the conveying planes of the first conveyor and the second conveyor.

2. The variable pitch double-deck elevator according to claim 1, characterized in that: The driving unit includes a driving motor, a driving wheel, a driven wheel and a driving belt. The driving wheel and the driven wheel are respectively arranged at relative positions at the upper and lower ends of the frame unit. The driving belt is sleeved between the driving wheel and the driven wheel. The driving motor drives the driving wheel to rotate. One side of the driving belt is fixedly connected to the double-layer lifting frame.

3. The variable pitch double-deck elevator according to claim 2, characterized in that: The variable distance mechanism includes a jacking assembly, which includes a jacking cylinder and a fixed plate. The fixed plate is fixedly connected to the lower layer of the double-layer lifting frame, the fixed end of the jacking cylinder is fixedly connected to the fixed plate, and the free end of the jacking cylinder is fixedly connected upward to the second conveyor. The jacking cylinder drives the second conveyor to move up and down in the vertical direction relative to the first conveyor.

4. The variable pitch double-deck elevator according to claim 3, characterized in that: The lifting assembly also includes a linear bearing and a guide rod. The linear bearing is fixedly provided on the fixed plate in a vertical direction. One end of the guide rod is fixedly connected to the second conveyor, and the other end of the guide rod passes through the linear bearing.

5. The variable pitch double-deck elevator according to claim 4, characterized in that: The jacking assembly also includes a limit buffer assembly, which includes a guide rod connecting plate, an adjustment bolt and a buffer member. The guide rod connecting plate is fixedly connected to the other end of the guide rod, and the adjustment bolt and the buffer member are arranged on the guide rod connecting plate relative to the direction of the second conveyor.

6. The variable pitch double-deck elevator according to claim 2, characterized in that: The variable distance mechanism includes an electric cylinder, and the double-layer lifting frame includes an upper lifting frame and a lower lifting frame. The upper lifting frame and the lower lifting frame are arranged at intervals in the vertical direction. The fixed end of the electric cylinder is fixedly connected to the upper lifting frame, and the free end of the electric cylinder is connected to the lower lifting frame. The electric cylinder drives the lower lifting frame to move up and down in the vertical direction relative to the upper lifting frame.

7. The variable pitch double-deck elevator according to claim 3 or 6, characterized in that: The lifting unit also includes a counterweight assembly, which includes a counterweight plate, a guide wheel and a first guide rail. The first guide rail is arranged at a relative position on one side of the frame unit in the vertical direction. The guide wheels are arranged on both sides of the counterweight plate. The guide wheels are slidably connected to the first guide rail, and the counterweight plate is fixedly connected to the other side of the drive belt.

8. The variable pitch double-deck elevator according to claim 7, characterized in that: It also includes a maintenance limit assembly, which includes an electric control sensor, a latch limit assembly and a latch. The electric control sensor and the latch limit assembly are arranged on the frame unit. When the latch is completely placed in the latch limit assembly, the electric control sensor controls the drive motor to stop running.

9. A conveying system, characterized in that: It comprises a feeding double-layer conveyor line, a discharging double-layer conveyor line and a variable pitch double-layer elevator as described in any one of claims 1 to 8, wherein the feeding double-layer conveyor line is docked with the feeding end of the variable pitch double-layer elevator, and the discharging double-layer conveyor line is docked with the discharging end of the variable pitch double-layer elevator.

10. The delivery system according to claim 9, wherein: The double-layer feeding conveyor line body includes a first feeding conveyor line and a second feeding conveyor line stacked up and down with an interval, and the double-layer discharging conveyor line body includes a first discharging conveyor line and a second discharging conveyor line stacked up and down with an interval, and the conveying plane spacing between the first feeding conveyor line and the second feeding conveyor line is different from the conveying plane spacing between the first discharging conveyor line and the second discharging conveyor line.

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