U-shaped reinforcing steel bar in-out bin device based on RGV cache cartridge holder bin

Abstract

The invention provides a U-shaped steel bar warehouse-in and warehouse-out device based on an RGV cache cartridge holder warehouse, and belongs to the technical field of steel bar warehouse-in and warehouse-out conveying, and the U-shaped steel bar warehouse-in and warehouse-out device comprises a driving control mechanism and a plurality of translation transfer units; the translation transfer unit comprises a translation seat arranged in a reciprocating sliding mode and a limiting seat fixedly arranged, and a first limiting piece and a second limiting piece are arranged on the translation seat. According to the U-shaped steel bar in-out bin device based on the RGV cache clip bin, a manipulator can directly feed and press a U-shaped steel bar into a temporary limiting area of the translation transfer unit from the front in sequence, accurate alignment with a plurality of spiral gaps in different directions is not needed, when the U-shaped steel bar is out of bin, the spiral feeding and discharging system rotates to release the U-shaped steel bar to the translation transfer unit, and the U-shaped steel bar is conveyed to the translation transfer unit. And then the translation transfer unit moves forwards to convey the U-shaped ribs to the initial warehousing position so that the U-shaped ribs can be clamped by the transfer mechanism, high cooperation of the transfer mechanism and the spiral feeding and discharging structure is not needed, and the reliability and stability of long-term operation of an automatic production line are integrally and effectively improved.

Description

Technical Field

[0001] This invention relates to the field of steel bar loading and unloading conveying technology, specifically a U-shaped steel bar loading and unloading device based on an RGV buffer magazine. Background Technology

[0002] In the automated conveying and processing production line for box girder reinforcement, U-shaped bars are typically bent and welded first, and then threaded and welded together with longitudinal bars. To ensure the matching of the cycle times of the preceding and following processes and to improve the continuity of the entire line, a buffer device is usually set up between the U-shaped bar forming station and the longitudinal bar welding station to temporarily store a certain number of U-shaped bars and arrange them for output in a predetermined order.

[0003] In existing technologies, buffer devices are mostly buffer magazines, which typically include a screw feed system. This system usually includes two sets of screw feed structures located at the bottom of the U-shaped steel bar, and two sets of screw feed structures arranged on the left and right sides respectively. Through the synchronous forward and reverse rotation of the four sets of screw feed structures, the feeding and discharging of the U-shaped steel bars piece by piece is achieved.

[0004] In practice, the buffer magazine is initially located at the feeding station. A robotic arm places the welded U-shaped ribs piece by piece into the magazine. Once the buffer quantity reaches a set value, the entire buffer magazine is moved to the unloading station via an RGV (Rail Guided Vehicle) system. One side of the unloading station is typically the longitudinal rib threading position, and the other side is the welding position between the U-shaped ribs and the longitudinal ribs. After the buffer magazine is in place, the longitudinal rib threading operation is completed first. Then, a spiral feeding and unloading system delivers the U-shaped ribs piece by piece, and a transfer mechanism transports them along the threading direction to the longitudinal rib welding position to complete the welding process between the longitudinal ribs and the U-shaped ribs.

[0005] However, the existing U-shaped steel bars in the buffer magazine achieve support and restraint by embedding them into the helical gaps. During the loading process, the handling robot needs to accurately align with the corresponding helical gaps and simultaneously meet the multi-directional restraint requirements of bottom support and left and right lateral constraints. The limited overall space and high position matching requirements increase the difficulty of mechanism control. Fluctuations in positioning accuracy and synchronization accuracy can easily affect the smoothness of the loading action, thereby affecting the stability of the entire line operation. During the unloading process, as the four sets of helical feeding and discharging structures rotate, the U-shaped steel bars gradually move away from the helical gap restraints. The transfer mechanism needs to promptly clamp and transport the steel bars. If the actions of the transfer mechanism and the helical feeding and discharging structures are not accurately coordinated, the U-shaped steel bars may lose their restraints and not be clamped, resulting in unexpected movement, or they may not completely lose their restraints and be clamped and transported, causing interference and affecting the smoothness of unloading. Similarly, if the handling robot directly presses the U-shaped steel bars into the helical feeding and discharging structures during the loading process, the handling robot and the helical feeding and discharging structures need to work in close coordination to ensure successful loading. Summary of the Invention

[0006] This invention provides a U-shaped rebar loading and unloading device based on an RGV buffer magazine, comprising a drive control mechanism and several translational transfer units. The translational transfer units are at least distributed at the bottom and both sides of the U-shaped rebar, and each unit includes a reciprocating sliding translation seat and a fixed limiting seat. The translation seat is provided with a limiting element one and a limiting element two, both of which are elastically slidably installed and arranged opposite each other to form a temporary limiting area. Both limiting elements one and two have a non-retractable state and a retractable state. The limiting seat is used to limit limiting elements one and two, ensuring that they move from the first working position to the second working position of the translation seat. During the process, the limiting position automatically switches between a non-retractable state and a retractable state. When the translation seat is in the first working position, limiting component one is in the retractable state and limiting component two is in the non-retractable state. When the translation seat is in the second working position, the two states are reversed. During the loading process, the U-shaped rib passes through the retractable limiting component one and enters the temporary limiting area, and the translation seat moves from the first working position to the second working position. During the unloading process, the U-shaped rib passes through the retractable limiting component two and enters the temporary limiting area, and the translation seat moves from the second working position to the first working position. The drive control mechanism is used to synchronously control the reciprocating movement of the translation seat.

[0007] In one possible implementation, both the first limiting member and the second limiting member have a first limiting state and a second limiting state. In the first limiting state, the outward extension length of the first limiting member and the second limiting member is greater than that in the second limiting state. In the first limiting state, the first limiting member and the second limiting member are in a non-retractable state. In the second limiting state, the first limiting member and the second limiting member are in a retractable state.

[0008] In one possible implementation, both the first limiting member and the second limiting member are columnar structures with an arc-shaped guide end at the end away from the limiting seat, and a limiting head at the end near the limiting seat. The limiting seat includes a first limiting segment and a second limiting segment located on both sides of the first limiting segment. When the limiting head is located in the first limiting segment, the corresponding first limiting member and the second limiting member are in a non-retractable state; when the limiting head is located in the second limiting segment, the corresponding first limiting member and the second limiting member are in a retractable state.

[0009] In one possible implementation, the first limiting segment is a bidirectional limiting segment, the second limiting segment is a unidirectional limiting segment, and the first limiting segment and the second limiting segment are set consecutively.

[0010] In one possible implementation, the drive control mechanism includes a sprocket assembly and several spiral feeding units, each spiral feeding unit corresponding to a translation seat and used to control the reciprocating translation of the corresponding translation seat. The sprocket assembly synchronously controls the spiral feeding units to rotate forward or backward.

[0011] In one possible implementation, the translational transfer unit is also distributed on top of the U-shaped rib.

[0012] In one possible implementation, the receiving surface of the translation seat in the bottom translation transfer unit is not lower than the receiving point of the bottom spiral feed structure.

[0013] In one possible implementation, limiting eaves are fixedly sleeved on the first and second limiting members, and elastic members are provided on both sides of the limiting eaves. A limiting groove is provided in the translation seat, and the elastic members 8 on both sides of the limiting eaves are located in the limiting groove.

[0014] The above-mentioned one or more technical solutions in the embodiments of the present invention have the following technical effects: According to the embodiments of the present invention, a U-shaped steel bar loading and unloading device based on an RGV buffer magazine is provided. A translational transfer unit is set at the inlet end of the magazine. The robot can directly feed the U-shaped steel bar from front to back and press it directly into the temporary limiting area of ​​the translational transfer unit. It does not need to be accurately aligned with the gaps of the spirals in multiple different directions. Then, the translational transfer unit smoothly feeds the U-shaped steel bar into the spiral feeding and discharging system by translational feeding. When unloading, the spiral feeding and discharging system rotates to release the U-shaped steel bar to the translational transfer unit. Then, the translational transfer unit moves forward to send the U-shaped steel bar to the initial loading position for the transfer mechanism to clamp. There is no need for the transfer mechanism and the spiral feeding and discharging structure to coordinate. Moreover, the aforementioned loading and unloading process is automatically switched by the translational seat reciprocating between the first working position and the second working position and the limiting seat limiting the first and second limiting components. Overall, it effectively improves the reliability and stability of the long-term operation of the automated production line. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the magazine and the robotic arm.

[0016] Figure 2 This is a schematic diagram of the translation seat and the limiting seat of a U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to an embodiment of the present invention.

[0017] Figure 3 This is an enlarged view of point A in diagram 2.

[0018] Figure 4 This is a structural schematic diagram of the outer shell, translation seat, and limiting seat of a U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the structure of a U-shaped steel bar loading and unloading device based on an RGV buffer magazine, provided by an embodiment of the present invention, in the first working position, showing a partial outer shell and two limiting components from the left view.

[0020] Figure 6 This is a schematic diagram of the structure of a U-shaped steel bar loading and unloading device based on an RGV buffer magazine, provided by an embodiment of the present invention, in the second working position, showing a partial outer shell and limiting member one and limiting member two from a left-side view.

[0021] Figure 7 This is a schematic diagram of the elastic element and limiting eaves of a U-shaped steel bar loading and unloading device based on an RGV buffer magazine, provided in an embodiment of the present invention.

[0022] In the diagram: 1. Translation seat; 2. Limiting component one; 3. Limiting component two; 4. Limiting seat; 41. First limiting section; 42. Second limiting section; 5. Limiting head; 6. Sprocket assembly; 61. Housing; 62. Sprocket; 63. Chain; 7. Screw feeding unit; 71. Base; 72. Screw shaft; 73. Sliding seat; 8. Elastic component; 9. Limiting groove; 10. Limiting eaves; 100. U-shaped rib; 200. Magazine compartment; 201. Screw feeding / discharging structure; 300. Robotic arm. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Please see Figure 1 , Figure 2 and Figure 4A U-shaped steel bar loading and unloading device based on an RGV buffer magazine includes a translational transfer unit and a drive control mechanism located at the front entrance of the magazine 200. The translational transfer units are distributed at the bottom, top, and left and right sides of the U-shaped steel bar 100. During loading, a robotic arm 300 feeds the U-shaped steel bar 100 from front to back, directly pressing it into the translational transfer unit. The bottom, top, and left and right sides of the translational transfer unit form multiple temporary limiting points to limit the U-shaped steel bar 100, placing it in a temporarily limited state. Driven by the drive control mechanism, the U-shaped steel bar 100 is fed into the screw feed system in a backward translational manner. The screw feed system includes four sets of screw feed structures 201, two of which are located below the U-shaped steel bar 100, and the other two are located on the left and right sides of the U-shaped steel bar 100, respectively. The U-shaped rib 100 completes its position transition before entering the screw feed structure 201 through the transition support of the translational transfer unit. Upon exiting the silo, the screw feed system rotates to release the U-shaped rib to the translational transfer unit. The translational transfer unit moves forward to deliver the U-shaped rib 100 to its initial entry position, where it is then gripped and transported to the subsequent workstation by a transfer mechanism (not shown in the figure). The entire entry and exit process requires no high-level coordination between the transfer mechanism and the screw feed structure 201, and no simultaneous precise alignment of the U-shaped rib 100 with multiple screw gaps in different directions by the robotic arm 300. This effectively improves the long-term reliability and stability of the automated production line.

[0025] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The translation and transfer unit includes a translation base 1 and a limiting base 4. The limiting base 4 is fixedly installed, while the translation base 1 is slidably installed back and forth. The translation base 1 is equipped with a first limiting member 2 and a second limiting member 3. Both the first limiting member 2 and the second limiting member 3 are elastically slidably installed, and are arranged opposite each other to form a temporary limiting area. Figure 3 As shown, the temporary limiting zone is used to limit the U-shaped rib 100.

[0026] Both limiters 1 (2) and 2 (3) have two states: a non-retractable state and a retractable state. During the reciprocating sliding of the translation seat 1, limiters 1 (2) and 2 (3) will automatically switch between the two states under the limit of the limit seat 4 to meet the entry and exit requirements of the U-shaped rib 100. The specific process is as follows, taking the translation transfer unit located at the bottom as an example. The other translation transfer units are similar.

[0027] The process of inserting U-shaped rib 100 into the warehouse: the translation seat 1 is located in the first working position (e.g., Figure 5As shown, the receiving surface of the translation seat 1 is level with or slightly higher than the receiving point of the screw feed structure 201. Limiting member 2 and limiting member 3 are both located in front of the screw gap inlet at the front end of the screw feed structure 201. At this time, limiting member 3 is in a non-retractable state under the limitation of the limiting seat 4, meaning it will not retract inward under external force, while limiting member 2 is in a retractable state. The robot arm 300 feeds the U-shaped rib 100 from front to back, allowing the U-shaped rib 100 to pass through limiting member 2 (during this process, limiting member 2 retracts inward first under the pushing force of the U-shaped rib 100, allowing the U-shaped rib 100 to pass, and then resets), and stops feeding against limiting member 3. At this time, the U-shaped rib 100 is located within the temporary limiting area. Then, the robot arm 300 is removed, and the translation seat 1 is moved backward.

[0028] During the backward movement of the translation seat 1, the limiting component 2 switches to a non-retractable state under the limiting seat 4, so as to stably limit the U-shaped rib 100, allowing the U-shaped rib 100 to move backward stably with the translation seat 1 until the translation seat 1 moves to the second working position (e.g., Figure 6 As shown in the diagram, at this point, the U-shaped rib 100 faces the entrance of the spiral gap. Then, the spiral feeding / discharging structure 201 rotates, causing the U-shaped rib 100 to enter the spiral gap and move backward with the rotation of the spiral feeding / discharging structure 201. During the aforementioned process, when the translation seat 1 is about to move to the second working position, the limiting member 2 3 automatically switches to an inwardly retractable state along with the translation seat 1. In this state, as the U-shaped rib 100 enters the spiral gap and is fed backward with the rotation of the spiral feeding / discharging structure 201, the U-shaped rib 100 can smoothly pass through the limiting member 2 3, which is in an inwardly retractable state. Correspondingly, it will not interfere with the translation seat 1 resetting forward to the first working position. Afterward, when the translation seat 1 resets forward to the first working position, both the limiting member 1 2 and the limiting member 2 3 automatically complete the state reset switch. By repeating the aforementioned steps, the U-shaped rib 100 can be continuously fed into the storage. It should be noted that in this embodiment, a set of front-to-back opposing limiting members 2 and 3 is added to the bottom translational transfer unit to further improve the stability of the temporary limiting and feeding of the U-shaped rib 100. Similarly, the remaining translational transfer units can also be added according to actual needs.

[0029] Unloading of the U-shaped rib 100: When the translation seat 1 is in the second working position, the spiral feeding / discharging structure 201 rotates in the opposite direction, causing the U-shaped rib 100 to pass through the inwardly retractable limiting member 3 and enter the temporary limiting area for release. Subsequently, the translation seat 1 moves forward and resets to the first working position. At this time, the transfer mechanism clamps and fixes the U-shaped rib 100 and feeds it forward. The U-shaped rib 100 can smoothly pass through the inwardly retractable limiting member 2 to complete the unloading process. It should be noted that when the translation seat 1 is in the first working position, although the limiting member 2 is in an inwardly retractable state, the multiple limiting points allow the U-shaped rib 100 to remain within the temporary limiting area without external force.

[0030] See Figure 5 and Figure 6 Both limiting member 2 and limiting member 3 have a first limiting state and a second limiting state. In the first limiting state, the extended length of limiting member 2 and limiting member 3 is greater than that in the second limiting state, and in the first limiting state, limiting member 2 and limiting member 3 are in a non-retractable state. In the second limiting state, limiting member 2 and limiting member 3 are in a retractable state. Specifically: when the translational seat 1 is located at the first working position, such as... Figure 5 As shown, the second limiting member 3 is in the first limiting state under the limiting seat 4, and the first limiting member 2 is in the second limiting state. The highest point of the first limiting member 2 is lower than the second limiting member 3. The U-shaped rib 100 can pass smoothly from front to back through the first limiting member 2 and can be stably and reliably blocked by the second limiting member 3 and stop in the temporary limiting area.

[0031] When the translational seat 1 is in the second working position, as Figure 6 As shown, the first limiting member 2 is in the first limiting state under the limiting seat 4, and the second limiting member 3 is in the second limiting state. The highest point of the second limiting member 3 is lower than the first limiting member 2. The U-shaped rib 100 can pass smoothly from back to front through the second limiting member 3 and can be stably and reliably blocked by the first limiting member 2 and stop in the temporary limiting area.

[0032] See Figure 5 and Figure 6 Both limiting component 2 and limiting component 3 are columnar structures, with an arc-shaped guide end at the end furthest from the limiting seat 4, and a limiting head 5 at the end closest to the limiting seat 4. The limiting heads 5 are symmetrically distributed left and right. The limiting seat 4 includes a first limiting segment 41, which is symmetrically distributed left and right and corresponds one-to-one with each limiting head 5. Second limiting segments 42 are provided on both the front and rear sides of the first limiting segment 41. Figure 5As shown, the first limiting segment 41 is a limiting groove segment that limits the limiting head 5 from both the top and bottom (i.e., bidirectional limiting), while the second limiting segment 42 is a limiting groove segment that limits the limiting head 5 from the top (i.e., unidirectional limiting). This allows the limiting member 2 or the limiting member 3, which is in a retractable state, to retract inward under force. At the same time, by limiting from the top, the limiting member 2 or the limiting member 3, which is in a retractable state, is stably in the second limiting state, ensuring that the U-shaped rib 100 passes smoothly through the limiting member 2 or the limiting member 3. The first limiting segment 41 and the second limiting segments 42 on both sides are continuously arranged to facilitate the movement of the limiting head 5 along the limiting groove segment.

[0033] See Figure 6 and Figure 7 Limiting members 1 and 2 are both fixedly fitted with limiting eaves 10. Elastic members 8 are provided on both sides of each limiting eave 10. A limiting groove 9 is provided within the translational seat 1. The elastic members 8 on both sides of the limiting eave 10 are located within the limiting groove 9 and, under the constraint of the limiting groove 9, apply an elastic force to the limiting eave 10, thereby providing a reset elastic force and a state-maintaining force for the limiting members 1 and 2. The elastic force of the lower elastic member 8 of the limiting eave 10 is greater than that of the upper elastic member 8. When the limiting members 1 and 2 are in a retractable state, their limiting heads 5 abut upwards against the second limiting section 42, thereby stably maintaining the second limiting state.

[0034] See Figure 2 , Figure 4 and Figure 5The drive control mechanism is used to synchronously control the forward and backward reciprocating motion of the translation seat 1. The drive control mechanism includes a sprocket set 6 and several spiral feeding units 7. Each spiral feeding unit 7 corresponds to a translation seat 1 and is used to control the reciprocating translation of the corresponding translation seat 1. The sprocket set 6 synchronously controls the spiral feeding unit 7 to rotate forward or backward. The specific sprocket assembly 6 includes a frame-shaped outer shell 61, which is fixedly installed at the front entrance of the magazine compartment 200. The outer shell 61 does not interfere with the entry and exit of the U-shaped rib 100. Sprockets 62 and chains 63 are arranged inside the outer shell 61. There are several sprockets 62, each corresponding to a spiral feeding unit 7. The spiral feeding unit 7 includes a base 71 located behind the outer shell 61. A spiral shaft 72 is rotatably mounted on the base 71. A sliding seat 73 is threaded onto the spiral shaft 72. The sliding seat 73 is slidably connected to the base 71 and fixedly connected to the corresponding translation seat 1. The spiral shaft 72 is inserted forward into the outer shell 61 and coaxially fixedly connected to the corresponding sprocket 62. The chain 63 has a closed structure and passes through the sprockets 62 sequentially, simultaneously meshing with them. Any one of the spiral shafts 72 can serve as the shaft of an external drive motor (not shown in the figure). By synchronously driving all the spiral shafts 72 in forward and reverse rotation via the chain 63, the reciprocating movement of the translation seat 1 can be synchronously controlled. Alternatively, a drive shaft with a sprocket 62 can be added, and the drive shaft can be controlled to rotate forward and backward by a drive motor, so that all the spiral shafts 72 can be driven to rotate forward and backward synchronously through the meshing of the sprocket 62 and the chain 63.

[0035] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine, characterized in that: It includes a drive control mechanism and several translation and transfer units; the translation and transfer units are distributed at least at the bottom and both sides of the U-shaped rib; The translation and transfer unit includes: a translation seat that is reciprocally slidably arranged, on which a limiting member one and a limiting member two are provided. The limiting member one and the limiting member two are elastically slidably installed and arranged relative to each other to form a temporary limiting area; and the limiting member one and the limiting member two both have a non-retractable state and a retractable state. The fixed limiting seat is used to limit the first limiting member and the second limiting member, so that when the translation seat moves from the first working position to the second working position, the limiting seat automatically switches between a non-retractable state and a retractable state. When the translation seat is in the first working position, the first limiting member is in a retractable state and the second limiting member is in a non-retractable state; when the translation seat is in the second working position, the two states are reversed. During the warehousing process, once the U-shaped rib enters the temporary limiting area after passing through the inwardly retractable limiting component, the translation seat moves from the first working position to the second working position. During the unloading process, the U-shaped rib enters the temporary limiting area through the inwardly retractable limiting component 2, and the translation seat moves from the second working position to the first working position; The drive control mechanism is used to synchronously control the reciprocating movement of the translation seat.

2. The U-shaped steel bar loading and unloading device based on the RGV buffer magazine according to claim 1, characterized in that: Both the first limiting member and the second limiting member have a first limiting state and a second limiting state. In the first limiting state, the outward extension length of the first limiting member and the second limiting member is greater than that in the second limiting state. In the first limiting state, the first limiting member and the second limiting member are in a state where they cannot retract inward. In the second limiting state, the first limiting member and the second limiting member are in a state where they can retract inward.

3. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 1 or 2, characterized in that: Both limiting member one and limiting member two are columnar structures with an arc-shaped guide end at the end away from the limiting seat and a limiting head at the end near the limiting seat. The limiting seat includes a first limiting segment and a second limiting segment located on both sides of the first limiting segment. When the limiting head is located in the first limiting segment, the corresponding limiting member one and limiting member two are in a non-retractable state; when the limiting head is located in the second limiting segment, the corresponding limiting member one and limiting member two are in a retractable state.

4. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 3, characterized in that: The first limiting segment is a bidirectional limiting segment, the second limiting segment is a unidirectional limiting segment, and the first limiting segment and the second limiting segment are set consecutively.

5. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 1, characterized in that: The drive control mechanism includes a sprocket assembly and several spiral feeding units. Each spiral feeding unit corresponds to a translation seat and is used to control the reciprocating translation of the corresponding translation seat. The sprocket assembly synchronously controls the spiral feeding unit to rotate forward or backward.

6. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 1, characterized in that: The translation and transfer units are also distributed on the top of the U-shaped ribs.

7. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 1, characterized in that: The receiving surface of the translation seat in the bottom translation transfer unit is not lower than the receiving point of the bottom spiral feeding and discharging structure.

8. A U-shaped steel bar loading and unloading device based on an RGV buffer magazine according to claim 1, characterized in that: Limiting eaves are fixedly sleeved on the first and second limiting members. Elastic members are provided on both sides of the limiting eaves. A limiting groove is provided in the translation seat. The elastic members on both sides of the limiting eaves are located in the limiting groove.

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