Steel bar conveying device

Abstract

The invention relates to the technical field of circulating conveying equipment, and particularly discloses a steel bar conveying device which comprises a rack and a conveying mechanism, the rack is further provided with a lifting mechanism, the lifting mechanism comprises a plurality of lifting assemblies and a driving assembly, and the lifting assemblies are arranged at intervals in the horizontal direction; the lifting assembly comprises stepped fixed steps and movable steps, the driving assembly drives all the movable steps to synchronously ascend and descend, and the heights of the steps on the same layer of all the movable steps are increased from the middle to the two sides; the lifting assembly located in the middle serves as a first lifting assembly, the first lifting assembly comprises first fixed steps and first movable steps, the width of the lowermost step of each first movable step is larger than that of the lowermost step of each first movable step, and each layer of step of each first fixed step is provided with a limiting piece. The limiting piece and the first fixing step are rotationally matched and connected through an elastic piece. According to the conveying device, the working efficiency and stability of steel bar upward moving conveying operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of circulating conveying equipment, and in particular to a steel bar conveying device. Background Art

[0002] In the production and processing of steel bars, a conveying device is required to gradually lift the steel bars from a low position to a high position for subsequent processing, such as bending, shearing, etc. In related technologies, the steel bars are mostly conveyed and loaded by a step-type feeder. The step-type feeder is provided with a driving mechanism and a lifting mechanism. The driving mechanism drives the lifting ladder of the lifting mechanism to move up and down. The steel bars to be loaded are stacked at the lower end of the lifting ladder. When the lifting ladder moves up and down, the steel bars are driven to be lifted step by step, and the steel bars are automatically loaded one by one in an orderly manner. In actual production operations, there are large differences in the diameters of the steel bars. When the step-type feeder conveys the steel bars, the steel bars stacked at the lower end of the lifting mechanism are in a relatively scattered state. When the steel bars are loaded through the lifting mechanism, the steel bars may not be able to overlap with all the lifting ladders at the same time, resulting in the problem of slipping when the steel bars are loaded. The repeated falling of the steel bars is also repeatedly pushed at the lower end of the lifting mechanism, which not only affects the work efficiency but also causes continuous friction and wear between the steel bars and the lifting mechanism.

[0003] The patent document with the authorization announcement number CN116395331B discloses a steel bar processing, transporting and feeding device, including a base, a conveying mechanism, a shaking mechanism and an output mechanism. A fixed ladder is fixedly connected to the base, a lifting ladder is arranged on the fixed ladder, the conveying mechanism includes a conveyor belt, the shaking mechanism includes a shaking plate, and the output mechanism includes a crawler. The steel bar processing, transporting and feeding device drives the conveyor belt to rotate through the conveying mechanism, and drives the lifting ladder to reciprocate and lift at the same time; The transport and loading device disclosed in the patent document drives the shaking plate to rise and fall reciprocally through a shaking mechanism, so that the steel bars are intermittently lifted up, and the output mechanism is linked to the crawler belt to rotate when the conveyor belt rotates and transports, so that the stacked upper steel bars are continuously pushed to the side away from the fixed step, thereby realizing automatic flattening of the steel bars. Since the overall length of the steel bars is relatively long, when loading some small-diameter steel bars, the ends of the steel bars are prone to overlap or overlap, and the problem of material jamming may occur during the steel bar output process. Summary of the invention

[0004] The present invention provides a steel bar conveying device, which aims to solve the problem in the related technology that when a step-type loader is used to convey and load steel bars, the steel bars are easily dropped again after being overlapped with the lifting step, thereby affecting the steel bar conveying efficiency, and the steel bars are easily worn against the lifting step or adjacent steel bars during the process of being repeatedly pushed.

[0005] A steel bar conveying device of the present invention comprises a frame and a conveying mechanism, wherein the frame is further provided with a lifting mechanism, wherein the conveying mechanism is used to convey the steel bars to the lower end of the lifting mechanism in a horizontal direction, wherein the lifting mechanism comprises a lifting assembly and a driving assembly, wherein the lifting assemblies have multiple groups, wherein each group of the lifting assemblies is arranged at intervals in a horizontal direction, wherein the lifting assemblies comprise a fixed ladder and a movable ladder in a stepped shape, wherein the driving assembly drives each of the movable ladders to rise and fall synchronously, and wherein the step height of each of the movable ladders in the same layer rises from the middle to both sides; A group of lifting components located in the middle is called lifting component 1, which includes a fixed step 1 and a movable step 1. The width of the lowest step of the movable step 1 is greater than the width of the lowest step of each movable step. Each layer of steps of each fixed step 1 is provided with a limit piece, which is rotatably matched with the fixed step 1 and connected through an elastic piece. When the movable step 1 moves upward, it pushes the limit piece to rotate and causes the elastic piece to store force.

[0006] The beneficial effects are: it improves the efficiency of conveying steel bars, and the width of the lowest step of the movable step one is greater than the width of the lowest step of each movable step, so that when the lifting mechanism lifts the steel bars at the conveying end of the conveying mechanism, it ensures that the middle part of the steel bars can be smoothly overlapped on the lowest step of the movable step one; when the movable step one drives the steel bars to move up one step, the limiter rotates to limit the position of the steel bars after moving up to prevent the steel bars from slipping; the step height of each movable step on the same layer increases from the middle to both sides, so that during the process of moving the steel bars up, they are gradually overlapped with the lifting components on the outside of the lifting component one, thereby improving the effective working efficiency of each lifting component, so that the steel bars can be loaded in a relatively flat state, which is convenient for the steel bars to smoothly enter the next processing procedure at the unloading end of the lifting mechanism.

[0007] Preferably, the limiting member includes a limiting portion and a connecting portion, the connecting portion is rotatably connected to the fixed step 1, with the side facing the movable step 1 being the inner side, the limiting portion is fixed to the outer side of the connecting portion, a gear is fixed to the inner side of the connecting portion, a plurality of racks are fixed on the movable step 1, and each of the racks is movably meshed with each of the gears one by one.

[0008] The beneficial effects are: improving the stability and flexibility of the lifting component in conveying the steel bars upward; when the movable step drives the steel bars to move up one step, the limiting part of the limiting part is synchronously driven to open, so that the steel bars rise one step and then fall to the position of the limiting part; when the movable step rises to the highest position, the rack moves to disengage from the gear, and the gear is reset under the action of the elastic part, limiting the upwardly moved steel bars to prevent them from rolling down; when the steel bars cannot be completely overlapped with the lifting components, the steel bars can be lifted step by step on the lifting mechanism only by the lifting component.

[0009] Preferably, there are two groups of the fixed steps 1, and the two groups of the fixed steps 1 are respectively arranged on both sides of the movable step 1.

[0010] The beneficial effect is that by setting two sets of fixed steps, the stability of the lifting component 1 in lifting the steel bars is further guaranteed.

[0011] Preferably, the frame is further provided with a plurality of guide grooves, each of which is obliquely arranged on both sides of the lifting component one, each of which is inclined upward in a direction away from the lifting component one, and each of the movable steps except the end portions is slidably matched with each of the guide grooves.

[0012] The beneficial effect is: it improves the efficiency of adjusting the steel bars to a relatively straight state, so that after the movable step on the outside of the lifting component is overlapped with the steel bars, it moves upward at an angle, quickly pushes the drooping end of the steel bars downward, and promotes the smooth overlap of the steel bars on the steps of each lifting component.

[0013] Preferably, the driving assembly includes a driving source, a driving shaft and a cam, the bottom of the movable step and each of the movable steps are fixed by a connecting piece, the driving source is installed on the frame, the driving end of the driving source is connected to the driving shaft, and the cam is fixed relative to the driving shaft and abuts against the bottom of the connecting piece.

[0014] Preferably, the lifting mechanism is also provided with an adjustment component, which includes an adjustment member, an adjustment portion, a movable rod and a plurality of movable blocks, the movable blocks correspond one-to-one to each of the movable steps and slide in conjunction with each other, each of the movable blocks is simultaneously fixed to the movable rod, and the adjustment portion is simultaneously fixed relative to each of the movable steps, the adjustment member is threadedly engaged with the adjustment portion, the adjustment member is connected to the movable rod and pushes the movable blocks to slide along the width direction of each of the movable steps.

[0015] Preferably, each of the movable steps is provided with a guide piece, the upper end of the movable block is consistent with the height of the lowest step of the movable step, and the movable block is slidably matched with the guide piece.

[0016] The beneficial effects are: it is convenient to adjust the difference in width between each movable step and the bottom step of the movable step according to the difference in straightness of steel bars of different diameters. By rotating the adjusting piece, the movable rod can be pushed to move in the direction close to or away from the conveying mechanism, and each movable block moves synchronously with the movable rod. The moving direction of the movable block is parallel to the width direction of the bottom step of each movable step. When each movable block moves toward the direction close to the conveying mechanism, the width of the bottom step of the movable step can be extended. When the width of the bottom step of each movable step is consistent with the width of the bottom step of the movable step, it is suitable for loading operations of large-diameter steel bars. Conversely, when each movable block moves in the direction away from the conveying mechanism, it is suitable for loading operations of small-diameter steel bars.

[0017] Preferably, the conveying mechanism includes a motor, a rotating shaft and a transmission belt, the conveying end of the conveying mechanism is opposite to the lower end of the lifting mechanism, and the conveying height of the conveying mechanism is higher than the lowest height of the movable ladder and the lowest step of the movable ladder.

[0018] Preferably, the height of the conveying mechanism is inclined downward in a direction close to the lifting mechanism at its conveying end.

[0019] The beneficial effects of the present invention are: (1) The efficiency of conveying steel bars is improved. The width of the lowest step of the movable step 1 is greater than the width of the lowest step of each movable step, so that when the lifting mechanism lifts the steel bars at the conveying end of the conveying mechanism, the middle part of the steel bars can be smoothly overlapped on the lowest step of the movable step 1. When the movable step 1 drives the steel bars to move up one step, the limiter rotates to limit the position of the steel bars after moving up to prevent the steel bars from slipping. The height of the steps on the same level of each movable step increases from the middle to both sides, so that during the process of moving the steel bars up, they are gradually overlapped with the lifting components on the outside of the lifting component 1, thereby improving the effective working efficiency of each lifting component, so that the steel bars can be loaded in a relatively flat state, which is convenient for the steel bars to smoothly enter the next processing step at the unloading end of the lifting mechanism.

[0020] (2) The efficiency of adjusting the steel bar from an arched state to a relatively straight state is improved, so that after the movable step on the outer side of the lifting component is overlapped with the steel bar, it moves upward at an angle, quickly pushing the drooping end of the steel bar downward, and promoting the smooth overlap of the steel bar on the steps of each lifting component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the overlap of the steel bars with the movable step 1 and the bottom steps of each movable step in the present invention.

[0023] Figure 3 It is a structural schematic diagram of a lifting component in the present invention that lifts a steel bar up one step.

[0024] Figure 4 It is a schematic diagram of the connection structure between the limiter and the lifting component 1 in the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the connection between the adjustment component and each movable step in the present invention.

[0026] Reference numerals: 1. Frame; 11. Conveying mechanism; 12. Guide groove; 2. Movable step 1; 21. Fixed step 1; 22. Limiting part; 23. Gear; 24. Elastic member; 25. Rack; 3. Movable step; 31. Fixed step; 32. Guide member; 4. Driving source; 41. Driving shaft; 42. Cam; 43. Connecting member; 5. Adjusting part; 51. Adjusting member; 52. Movable rod; 53. Movable block; 6. Rebar. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] like Figure 1 As shown, the steel bar conveying device of the present invention comprises a frame 1, a conveying mechanism 11 and a lifting mechanism. The lifting mechanism is arranged on the frame 1. The conveying mechanism 11 conveys the steel bars 6 in the horizontal direction. The lifting mechanism conveys the steel bars 6 one by one from bottom to top in a step-by-step manner. The lower end of the lifting mechanism is the feeding end of the steel bars 6, and the upper end of the lifting mechanism is the unloading end of the steel bars 6. The end of the conveying mechanism 11 away from the lifting mechanism is the conveying starting end, and the end of the conveying mechanism 11 close to the lifting mechanism is the conveying end. The conveying mechanism 11 comprises a motor, a rotating shaft and a transmission belt. There are two rotating shafts, and the transmission belt is simultaneously covered It is arranged on two rotating shafts, wherein the transmission belt and the rotating shaft can be in friction contact, the motor is fixed to one of the rotating shafts, and drives one rotating shaft to rotate when the motor is working. The transmission belt rotates back and forth under the action of the friction force between it and the rotating shaft and transports the steel bars 6 to the lifting mechanism. The conveying mechanism 11 can be set in multiple groups, and each group of conveying mechanisms 11 works synchronously to transport the steel bars 6 in the horizontal direction. In other embodiments, the transmission belt and the rotating shaft can also adopt a sprocket and chain transmission cooperation method. The structure and working method of the conveying mechanism 11 belong to the prior art, and its specific structure will not be repeated here.

[0029] like Figure 2 and Figure 3As shown, the lifting mechanism includes a lifting assembly and a driving assembly. The lifting assembly is provided with multiple groups, and each group of lifting assemblies is arranged at intervals in the horizontal direction. The lifting assembly includes a stepped fixed ladder 31 and a movable ladder 3. The fixed ladder 31 and the movable ladder 3 are both provided with multiple steps, and the width of each step decreases from top to bottom. The driving assembly is used to drive each movable ladder 3 to rise and fall synchronously, and to make each step on the movable ladder 3 move relative to each step on the fixed ladder 31. In the process of the driving assembly driving the movable ladder 3 to rise and fall, the movable ladder 3 pushes the overlapping The steel bars 6 on the fixed steps 31 are lifted step by step to transport the steel bars 6 from the lower end of the fixed steps 31 to the upper end of the fixed steps 31, and finally the loading operation of the steel bars 6 is completed. The fixed steps 31 and the movable steps 3 are arranged obliquely on the frame 1, that is, the steps of the fixed steps 31 and the movable steps 3 are inclined downward in the direction close to the frame 1, so that the movable steps 3 push the steel bars 6 to move up one step on the fixed steps 31, and the steel bars 6 move to the inner side of the upper step of the fixed steps 31, thereby improving the stability of the lifting assembly in transporting the steel bars 6.

[0030] The driving assembly includes a driving source 4, a driving shaft 41 and a cam 42. The bottom of the movable step 2 and each movable step 3 is fixed by a connecting piece 43. The connecting piece 43 can be a plate. The driving source 4 is installed on the frame 1. The driving end of the driving source 4 is connected to the driving shaft 41. The cam 42 is fixed relative to the driving shaft 41 and abuts against the bottom of the connecting piece 43. The driving source 4 can be a motor. The driving source 4 drives the cam 42 to rotate through the driving shaft 41. The cam 42 pushes the connecting piece 43 to move up at intervals, thereby driving the movable step 2 and each movable step 3 to move up at intervals.

[0031] Since the overall length of the steel bar 6 is relatively long, when the lifting mechanism transports the steel bar 6 from bottom to top, the various lifting components need to cooperate and contact multiple positions of the steel bar 6 to lift the steel bar 6 step by step. However, when transporting some steel bars 6 with smaller diameters, it is difficult for the steel bar 6 to maintain an ideal straight state. After the conveying mechanism 11 transports the stacked steel bars 6 to its conveying end, the steel bars 6 with smaller diameters are relatively scattered and difficult to overlap with the various lifting components at the same time. In particular, when the end of the steel bar 6 fails to overlap the lifting component smoothly, when the various lifting components work synchronously, the rising heights of various positions of the steel bar 6 will be uneven, and the steel bar 6 will slide under the action of its own gravity, affecting the conveying efficiency of the steel bar 6.

[0032] like Figures 2 to 4As shown, in order to realize the requirement that the lifting mechanism smoothly conveys the steel bars 6 upward, a plurality of limit members are arranged on the lifting assembly at the middle position, and each limit member corresponds one-to-one to each step of the fixed step 31. For the convenience of description, a group of lifting assemblies located in the middle is referred to as lifting assembly 1, and lifting assembly 1 includes a fixed step 21 and a movable step 2. The width of the lowermost step of the movable step 2 is greater than the width of the lowermost step of each movable step 3, so as to ensure that the middle part of the steel bars 6 can be smoothly overlapped on the lowermost step of the movable step 2 when the lifting mechanism lifts the steel bars 6 at the conveying end of the conveying mechanism 11.

[0033] The limiting member is rotatably matched with the fixed step 121 and connected through an elastic member 24, wherein the elastic member 24 may be a torsion spring. The limiting member includes a limiting portion 22 and a connecting portion, the connecting portion is rotatably connected with the fixed step 121, with the side facing the movable step 2 being the inner side, the limiting portion 22 is fixed to the outer side of the connecting portion, a gear 23 is fixed to the inner side of the connecting portion, a plurality of racks 25 are fixed to the movable step 12, each rack 25 is movably meshed with each gear 23 one by one, when the movable step 12 moves upward, the rack 25 contacts the gear 23 and drives the gear 23 to rotate, the gear 23 further drives the limiting portion 22 to rotate through the connecting portion, and the movable step 12 drives the steel bar When the movable step 12 is moved up one step, the limiting part 22 of the limiting member is synchronously driven to open, so that the steel bar 6 rises one step and then falls to the position of the limiting part 22. When the movable step 12 is raised to the highest position, the rack 25 moves to disengage from the gear 23. The gear 23 is reset under the action of the elastic member 24, and the moved steel bar 6 is limited to prevent it from rolling down. When the steel bar 6 cannot be completely overlapped with each lifting component, the steel bar 6 can be lifted up step by step on the lifting mechanism only by the lifting component 1. In order to ensure the stability of the lifting component 1 in lifting the steel bar 6, there are two groups of fixed steps 121, and the two groups of fixed steps 121 are respectively arranged on both sides of the movable step 12.

[0034] The working state of the lifting assembly that lifts the steel bar 6 upward step by step during the working process is an effective working state, otherwise it is an invalid working state. In actual operation, because the position and straightness of the steel bar 6 are not unique, it is difficult to ensure that the lifting mechanism is working. The effective work of each lifting assembly in the lifting mechanism can improve the effectiveness and stability of the upward transportation of the steel bar 6. In order to further improve the stability of the lifting mechanism in conveying the steel bar 6 upward and realize the smooth loading operation of the steel bar 6, more lifting assemblies are added that contact the steel bar 6 during the step-by-step upward movement of the steel bar 6, and the step height of each movable ladder 3 on the same layer is increased from the middle to both sides.

[0035] If the lifting mechanism and the steel bar 6 are initially in contact, only the lifting component 1 is in an effective working state. When the steel bar 6 moves upward, only the middle part is supported. Under the action of its own gravity, the steel bar 6 as a whole is in a state as follows: Figure 3The arch shown is high in the middle and low at both ends, and the step height of each movable step 3 on the same layer is set to increase from the middle to both sides. When the steel bar 6 moves up in an arched state, it can gradually overlap with the lifting component on the outside of the lifting component, and push the two sides of the steel bar 6 to move up under the change of the height of each movable step 3, so that the curvature of the steel bar 6 is gradually reduced in the operation of lifting layer by layer, which promotes the loading of the steel bar 6 in a relatively flat state, and facilitates the steel bar 6 to smoothly enter the next processing step at the unloading end of the lifting mechanism.

[0036] In order to further improve the efficiency of adjusting the steel bar 6 from an arched state to a relatively straight state, a plurality of guide grooves 12 are further provided on the frame 1. Each guide groove 12 is obliquely arranged on both sides of the lifting component 1, and each guide groove 12 is inclined upward in a direction away from the lifting component 1. Except for the end portion, each movable step 3 is slidably matched with each guide groove 12, so that after the movable step 3 on the outer side of the lifting component 1 is overlapped with the steel bar 6, it moves obliquely upward, quickly pushes the drooping end of the steel bar 6 downward, and promotes the steel bar 6 to be smoothly overlapped on the steps of each lifting component.

[0037] There are certain differences between steel bars 6 of different diameters. The straightness of steel bars 6 with larger diameters is more ideal, and it is not easy to overlap when stacked. When the lifting mechanism lifts the steel bars 6 with larger diameters, the steel bars 6 are easier to overlap on each movable step 3. In order to adapt to steel bars 6 with different diameters, the lifting mechanism is combined with the lifting mechanism to lift the steel bars 6 with larger diameters. Figure 5 As shown in the content, the lifting mechanism is also provided with an adjustment component, which includes an adjustment member 51, an adjustment portion 5, a movable rod 52 and a plurality of movable blocks 53. The movable blocks 53 correspond to each movable ladder 3 one by one and slide in cooperation. Specifically, a guide member 32 is fixed on each movable ladder 3. The upper end of the movable block 53 is consistent with the height of the lowest step of the movable ladder 3. The movable block 53 slides in cooperation with the guide member 32. Each movable block 53 is fixed to the movable rod 52 at the same time. The adjustment member 51 is threadedly matched with the adjustment portion 5. The adjustment portion 5 is fixed to the connecting member 43. By rotating the adjustment member 51, the movable The movable rod 52 moves in a direction approaching or away from the conveying mechanism 11, and each movable block 53 moves synchronously with the movable rod 52. The moving direction of the movable block 53 is parallel to the width direction of the bottom step of each movable step 3. When each movable block 53 moves in a direction approaching the conveying mechanism 11, the width of the bottom step of the movable step 3 can be extended. When the width of the bottom step of each movable step 3 is consistent with the width of the bottom step of the movable step 2, it is suitable for loading operations of large-diameter steel bars 6. Conversely, when each movable block 53 moves in a direction away from the conveying mechanism 11, it is suitable for loading operations of small-diameter steel bars 6.

[0038] The steel bar conveying device provided by the present invention is convenient for conveying steel bars upward one by one during the production process of steel bars, improves the stability of the steel bar upward conveying operation, reduces the problem of repeated falling and wear of steel bars, improves the steel bar conveying efficiency and ensures the overall processing quality of the steel bars.

[0039] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A steel bar conveying device, comprising a frame (1) and a conveying mechanism (11), characterized in that: The frame (1) is also provided with a lifting mechanism, the conveying mechanism (11) is used to convey the steel bars (6) to the lower end of the lifting mechanism in the horizontal direction, the lifting mechanism comprises a lifting assembly and a driving assembly, the lifting assembly comprises a plurality of groups, each group of the lifting assemblies is arranged at intervals in the horizontal direction, the lifting assembly comprises a stepped fixed step (31) and a movable step (3), the driving assembly drives each of the movable steps (3) to rise and fall synchronously, and the step height of each movable step (3) at the same level rises from the middle to both sides; A lifting assembly group located in the middle is a lifting assembly one, the lifting assembly one comprising a fixed step one (21) and a movable step one (2), the width of the lowest step of the movable step one (2) being greater than the width of the lowest step of each movable step (3), each step of each fixed step one (21) being provided with a limiting member, the limiting member being rotationally matched with the fixed step one (21) and connected via an elastic member (24), and when the movable step one (2) moves upward, the limiting member is pushed to rotate and the elastic member (24) is caused to store force.

2. The steel bar conveying device according to claim 1, characterized in that: The limiting member comprises a limiting portion (22) and a connecting portion, the connecting portion being rotatably connected to the fixed step one (21), with the side facing the movable step one (2) being the inner side, the limiting portion (22) being fixed to the outer side of the connecting portion, a gear (23) being fixed to the inner side of the connecting portion, a plurality of racks (25) being fixed to the movable step one (2), and each of the racks (25) being movably meshed with each of the gears (23) one by one.

3. The steel bar conveying device according to claim 1, characterized in that: There are two groups of the fixed steps 1 (21), and the two groups of the fixed steps 1 (21) are respectively arranged on both sides of the movable step 1 (2).

4. The steel bar conveying device according to claim 1, characterized in that: The frame (1) is also provided with a plurality of guide grooves (12), each of the guide grooves (12) being obliquely arranged on both sides of the lifting component one, each of the guide grooves (12) being inclined upward in a direction away from the lifting component one, and each of the movable steps (3) except the end portions being slidably matched with each of the guide grooves (12).

5. The steel bar conveying device according to claim 1, characterized in that: The driving assembly comprises a driving source (4), a driving shaft (41) and a cam (42); the bottom of the movable step (2) and each of the movable steps (3) are fixed by a connecting piece (43); the driving source (4) is mounted on the frame (1); the driving end of the driving source (4) is connected to the driving shaft (41); the cam (42) is fixed relative to the driving shaft (41) and abuts against the bottom of the connecting piece (43).

6. The steel bar conveying device according to claim 1, characterized in that: The lifting mechanism is also provided with an adjustment component, which comprises an adjustment member (51), an adjustment portion (5), a movable rod (52) and a plurality of movable blocks (53). The movable blocks (53) correspond to each of the movable steps (3) one by one and are slidably matched. Each of the movable blocks (53) is simultaneously fixed to the movable rod (52). The adjustment portion (5) is simultaneously fixed relative to each of the movable steps (3). The adjustment member (51) is threadedly matched with the adjustment portion (5). The adjustment member (51) is connected to the movable rod (52) and pushes the movable block (53) to slide along the width direction of each of the movable steps (3).

7. The steel bar conveying device according to claim 6, characterized in that: Each movable step (3) is provided with a guide member (32), the upper end of the movable block (53) is consistent with the height of the lowest step of the movable step (3), and the movable block (53) is slidably matched with the guide member (32).

8. The steel bar conveying device according to claim 1, characterized in that: The conveying mechanism (11) comprises a motor, a rotating shaft and a transmission belt. The conveying end of the conveying mechanism (11) is opposite to the lower end of the lifting mechanism. The conveying height of the conveying mechanism (11) is higher than the lowest height of the movable step (3) and the lowest step of the movable step one (2).

9. The steel bar conveying device according to claim 8, characterized in that: The height of the conveying mechanism (11) is inclined downward in a direction close to the lifting mechanism at its conveying end.

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