A gantry type U-shaped steel bar and longitudinal bar clamping tool based on steel reinforcement framework welding

Abstract

The application provides a gantry type U-shaped steel bar and longitudinal bar clamping tool based on steel reinforcement framework welding and belongs to the technical field of steel reinforcement framework welding clamping tools, which comprises a rotary pressing mechanism, wherein the rotary pressing mechanism comprises a rotary seat, a rotary piece, a pressing head, a posture control structure and a driving piece. The gantry type U-shaped steel bar and longitudinal bar clamping tool based on steel reinforcement framework welding is characterized in that the rotary seat is controlled to reciprocate by the driving piece, the rotary piece is automatically controlled to rotate by the posture control structure during the rotation, the pressing head is stably switched between the first posture and the second posture, the longitudinal bar gap passing and pressing actions are sequentially and stably completed in the same rotary stroke of the rotary seat, the action path is simple during the whole process, the control system complexity and long-term operation and maintenance cost are effectively reduced, the stability and reliability during the operation process are high, the influence of the cumulative error on the longitudinal bar pressing and releasing process can be effectively reduced, and the stability and reliability during the long-term production process are improved.

Description

A gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding Technical Field

[0001] This invention relates to the field of steel reinforcement cage welding clamping fixtures, specifically a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel reinforcement cage welding. Background Technology

[0002] In automated production lines for box girder reinforcement cages, U-shaped bars and longitudinal bars typically need to be welded and fixed in a pre-positioned state to form a stable reinforcement cage structure. To ensure welding quality, existing technologies usually use dedicated gantry-type clamping fixtures to limit and compress the U-shaped bars and each row of longitudinal bars.

[0003] Existing clamping fixtures generally include a U-shaped rib retainer, an outer longitudinal rib retainer, an inner longitudinal rib retainer, and an upper longitudinal rib pulling mechanism and a lower longitudinal rib pressing mechanism located in the base plate area. The U-shaped rib retainer is used to limit and constrain the U-shaped rib, maintaining its designed posture. The outer and inner longitudinal rib retainers respectively limit the longitudinal ribs located on both sides of the U-shaped rib, ensuring the ribs are abutted against the corresponding positions of the U-shaped rib. Since the longitudinal ribs on both sides are located in the outer area of ​​the U-shaped rib, the structural space is relatively ample, and the limiting and clamping actions are relatively simple to implement.

[0004] However, the clamping and clamping of the upper and lower rows of longitudinal bars located in the bottom plate area inside the U-shaped reinforcement is significantly more difficult. Both rows of longitudinal bars are situated inside the U-shaped reinforcement; the upper row needs to be pressed upwards against the U-shaped reinforcement, and the lower row needs to be pressed downwards. Simultaneously, the U-shaped reinforcement bars must be sequentially fed into the welding station along the conveying direction during production, requiring a smooth feeding path without structural interference. In existing technologies, the upper longitudinal bar pulling mechanism and the lower longitudinal bar pressing mechanism on the bottom plate typically employ a composite motion structure combining a lifting mechanism and a translation mechanism. The operation generally involves: first, the clamping head passes through the gap between the longitudinal bars via the lifting mechanism; then, it moves to the target longitudinal bar position via the translation mechanism; subsequently, it is lifted again to complete the clamping; the release process is executed in reverse. The entire clamping and release process involves numerous steps, a complex motion path, and requires multiple stop positions, resulting in a complex overall control system. Errors are prone to accumulate during operation, affecting the stability of the process. Furthermore, the multiple actions increase the cycle time of the clamping and release process, inhibiting the improvement of production cycle time and impacting long-term operational stability and reliability. Summary of the Invention

[0005] This invention provides a gantry-type U-shaped rebar and longitudinal bar clamping fixture based on welded rebar cage. The fixture includes a U-shaped bar retainer, an outer longitudinal bar retainer, an inner longitudinal bar retainer, and a rotary clamping mechanism. The rotary clamping mechanism is respectively positioned above the upper longitudinal bar and below the lower longitudinal bar. Each rotary clamping mechanism includes a rotating base, several rotating components, several clamping heads, a posture control structure, and a driving component. The rotating components are spaced apart along the axial direction of the rotating base and are rotatably mounted on the base. The clamping heads correspond one-to-one with the rotating components and are fixedly connected. The posture control structure controls the rotation of the rotating components during the rotation of the rotating base, allowing the clamping heads to switch between a first posture and a second posture. The driving component drives the rotating base to reciprocate. In the first posture, the clamping head rotates with the rotating base and passes through the gap between adjacent longitudinal bars. In the second posture, the clamping head contacts and clamps the longitudinal bar with the rotating base, causing the longitudinal bar to abut against the U-shaped rebar. The clamping head sequentially completes the passing and clamping actions within the same rotation stroke.

[0006] In one possible implementation, both the rotating seat and the rotating component are columnar structures, and the diameter of the rotating component is smaller than the diameter of the rotating seat; the rotating component penetrates the rotating seat radially, and a limit structure is provided at the junction of the rotating component and the rotating seat to limit the rotation range of the rotating component.

[0007] In one possible implementation, the attitude control structure includes a fixedly arranged arc-shaped rack segment with limit segments on both sides; a gear and a limit block fixedly mounted on the rotating component; as the rotating seat rotates, the gear passes through the arc-shaped rack segment, and the two mesh to control the rotation of the rotating component; the limit block passes through the limit segment as the rotating seat rotates, and inhibits the rotation of the rotating component under the limit of the limit segment; and the limit of the limit segment on the limit block does not occur simultaneously with the meshing of the gear and the arc-shaped rack segment.

[0008] In one possible implementation, the clamping head includes a lateral clamping portion and a vertical limiting portion, the vertical limiting portion being used to limit the longitudinal ribs.

[0009] In one possible implementation, the vertical limiting portion includes two opposing arc-shaped structures with their opposing surfaces inclined, forming a trumpet-shaped limiting area to limit and constrain the position of the longitudinal ribs.

[0010] In one possible implementation, the drive element includes a meshing toothed ring and a linear rack, and a drive source for controlling the linear movement of the linear rack, with the toothed ring fixed to a rotating base.

[0011] In one possible implementation, the limiting structure includes a limiting head fixed to the rotating component and a limiting groove formed on the rotating seat. The limiting groove limits the limiting head, thereby limiting the rotation range of the rotating component.

[0012] In one possible implementation, the limiting block is a cube structure.

[0013] 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 gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on welded steel bar skeleton is provided. The rotating seat is controlled to reciprocate through a driving component, and the rotation of the rotating component is automatically controlled by an attitude control structure during the rotation process. This allows the clamping head to stably switch between a first attitude and a second attitude, thereby sequentially and stably completing the longitudinal bar gap crossing and clamping actions within the same rotation stroke of the rotating seat. Furthermore, the attitude control structure improves the stability of the clamping head attitude switching process through segmented control of the rotating component. Compared with the prior art, the present invention has a simple action path, effectively reducing the complexity of the control system and long-term operation and maintenance costs. It exhibits high stability and reliability during operation and effectively reduces the impact of accumulated errors on the longitudinal bar clamping and releasing process, improving the stability and reliability of the long-term production process. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar skeleton welding provided in an embodiment of the present invention.

[0015] Figure 2 is a schematic diagram of the structure of the U-shaped bar retainer, the outer longitudinal bar retainer, and the inner longitudinal bar retainer from the front view of a gantry-type U-shaped bar and longitudinal bar clamping fixture based on welded steel bar skeleton provided in an embodiment of the present invention.

[0016] Figure 3 is a schematic diagram of the structure of the local U-shaped reinforcement, the upper longitudinal reinforcement, and the lower longitudinal reinforcement.

[0017] Figure 4 is a partial side view of a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding provided in an embodiment of the present invention.

[0018] Figure 5 is a schematic diagram of the structure of the clamping head in the initial state of a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding provided in an embodiment of the present invention, located below the lower longitudinal bar.

[0019] Figure 6 is a schematic diagram of the structural state change from the first posture to the second posture in a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar skeleton welding provided in an embodiment of the present invention, after the clamping head in the rotating clamping mechanism located below the lower longitudinal bar moves to above the lower longitudinal bar.

[0020] Figure 7 is a schematic diagram of the state in which the clamping head in the rotating clamping mechanism located below the lower longitudinal bar presses down on the lower longitudinal bar in a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding provided in an embodiment of the present invention.

[0021] Figure 8 is a schematic diagram of the arc-shaped rack segment and the limiting segment of the rotating clamping mechanism located below the lower longitudinal bar in a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar skeleton welding provided in an embodiment of the present invention, viewed from below.

[0022] Figure 9 is a schematic diagram of the structural state change from the first posture to the second posture in a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar skeleton welding provided in an embodiment of the present invention. The clamping head in the rotating clamping mechanism located below the lower longitudinal bar moves to above the lower longitudinal bar.

[0023] Figure 10 is a schematic diagram of the limiting head and limiting groove of a gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar skeleton welding provided in an embodiment of the present invention.

[0024] In the diagram: 1. U-shaped rib retainer; 2. Outer longitudinal rib retainer; 3. Inner longitudinal rib retainer; 4. Rotary seat; 5. Rotating component; 6. Pressing head; 61. Lateral pressing part; 62. Vertical limiting part; 7. Attitude control structure; 71. Arc-shaped rack segment; 72. Limiting segment; 73. Gear; 74. Limiting block; 8. Driving component; 81. Gear ring; 82. Linear rack; 83. Driving source; 9. Limiting structure; 91. Limiting head; 92. Limiting groove; 10. Mounting seat; 100. Upper longitudinal rib; 200. Lower longitudinal rib; 300. U-rib. Detailed Implementation

[0025] 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.

[0026] Please refer to Figures 1 and 2. A gantry-type U-shaped rebar and longitudinal bar clamping fixture based on rebar cage welding includes a U-shaped rebar holder 1, an outer longitudinal bar holder 2, an inner longitudinal bar holder 3, and a rotary clamping mechanism. The U-shaped rebar holder 1, the outer longitudinal bar holder 2, and the inner longitudinal bar holder 3 are symmetrically distributed left and right, with the symmetrically distributed inner longitudinal bar holder 3 located between the symmetrically distributed outer longitudinal bar holders 2. As shown in Figures 1 and 2, the U-shaped rebar holder 1, through bottom support and side limiting, keeps the U-shaped rebar 300 in a vertical, weldable position. The inner longitudinal bar holder 3 is used to press the inner longitudinal bar outward, and the outer longitudinal bar holder 2 is used to press the outer longitudinal bar inward, so that the longitudinal bars abut against the U-shaped rebar 300 to ensure welding quality. There are two rotary clamping mechanisms, located above the upper longitudinal rib 100 and below the lower longitudinal rib 200, respectively. The rotary clamping mechanism above the upper longitudinal rib 100 presses the upper longitudinal rib 100 upward, while the rotary clamping mechanism below the lower longitudinal rib 200 presses the lower longitudinal rib 200 downward, so that the upper longitudinal rib 100 and the lower longitudinal rib 200 abut against the U-rib 300 to ensure welding quality. The entire clamping and releasing process can be achieved through reciprocating rotation.

[0027] Referring to Figures 2-10, the rotary clamping mechanism includes a mounting base 10, on which a rotary seat 4, an attitude control structure 7, and a driving component 8 are mounted. The rotary seat 4 rotates on the mounting base 10 and reciprocates under the drive of the driving component 8. Several rotating components 5 are rotatably mounted on the upper limit of the rotary seat 4, and the rotating components 5 are spaced apart along the axial direction of the rotary seat 4. A clamping head 6 is fixedly mounted on each rotating component 5. The rotating components 5 rotate synchronously with the rotary seat 4, and during rotation, they rotate under the control of the attitude control structure 7, allowing the clamping head 6 to switch between a first posture and a second posture. In the first posture, the clamping head 6 rotates with the rotary seat 4, passing through the gap between adjacent longitudinal ribs; in the second posture, the clamping head 6 rotates with the rotary seat 4, contacting and clamping the longitudinal rib, causing the longitudinal rib to abut against the U-rib 300. Taking the rotary clamping mechanism located below the lower longitudinal rib 200 as an example, the longitudinal rib clamping process is specifically described; the clamping process of the other rotary clamping mechanism is similar.

[0028] In the initial state, as shown in Figure 5, the clamping head 6 is located below the lower longitudinal rib 200, and at this time, the clamping head 6 is in the first posture.

[0029] Next, the drive unit 8 is activated, causing the rotating seat 4 to rotate clockwise until the clamping head 6 passes through the gap of the lower longitudinal rib 200 and reaches above the lower longitudinal rib 200 (as shown in Figure 6). Then, as the rotating seat 4 continues to rotate, the rotating component 5 rotates under the action of the attitude control structure 7, causing the clamping head 6 to switch to the second attitude (as shown in Figures 6 and 8). Finally, as the rotating seat 4 continues to rotate, the clamping head 6 contacts the lower longitudinal rib 200 and presses down on the lower longitudinal rib 200, so that it abuts against the U-rib 300 to ensure welding quality. The clamping head 6 passes through the lower longitudinal rib 200 from bottom to top and completes the clamping work of the lower longitudinal rib 200, all within the same rotation stroke of the rotating seat 4. The reset process after welding is the opposite of the clamping process. Similarly, the clamping head 6 releases the clamping work and passes through the lower longitudinal rib 200 from top to bottom to complete the reset. This is also completed within the same rotation stroke of the rotating seat 4. The entire clamping and reset process of the rotating clamping mechanism can be completed by the reciprocating rotation of the rotating seat 4.

[0030] Referring to Figures 4-8, the attitude control structure 7 includes an arc-shaped rack segment 71 fixedly mounted on the mounting base 10. Limiting segments 72 are provided on both the front and rear sides of the arc-shaped rack segment 71, as shown in Figure 8. The limiting segments 72 are limiting channels with outlets. A gear 73 and a limiting block 74 are sequentially fixedly mounted on the end of the rotating component 5 away from the clamping head 6. The limiting block 74 is a cube with rounded corners on all four sides. In the initial state, the limiting block 74 is located within the front limiting segment 72. By limiting the limiting block 74 through the limiting segment 72, the rotation of the rotating component 5 is suppressed, keeping the clamping head 6 in its first posture. Subsequently, as the rotating seat 4 rotates, the pressing head 6 moves above the lower longitudinal rib 200. Just before the gear 73 is about to mesh with the arc-shaped rack segment 71, the limiting block 74 separates from the front limiting segment 72. Then, the gear 73 meshes with the arc-shaped rack segment 71, causing the rotating part 5 to rotate ninety degrees, thereby switching the pressing head 6 to the second posture. Afterward, the gear 73 disengages from the arc-shaped rack segment 71, and the limiting block 74 enters the rear limiting segment 72. Under the limiting effect of the limiting segment 72, the rotation of the rotating part 5 is suppressed again, so that the pressing head 6 is stably maintained in the second posture. Therefore, within a single rotation stroke of the rotating seat 4, the rotating component 5 is controlled in segments through a series of actions: the front limiting segment 72 limits the rotation, the gear 73 engages with the arc-shaped rack segment 71, and the rear limiting segment 72 limits it again. This allows the rotating component 5 to rotate within a specified range, while remaining locked in the remaining range. This ensures the stability of the clamping head 6's posture switching process and the stability of the longitudinal rib clamping and releasing processes. It should be noted that the rotating component 5 and the rotating seat 4 inherently possess frictional damping, which can suppress the rotation of the rotating component 5 under non-external force. Combined with the limiting segment 72 and the limiting block 74, and the guiding effect of the limiting segment 72's guide opening, the stability and reliability of the clamping head 6's posture switching process are effectively ensured.

[0031] Referring to Figures 6 and 9, the clamping head 6 includes a horizontal clamping part 61 and a vertical limiting part 62. The horizontal clamping part 61 is a cylindrical structure and is fixedly installed on the rotating part 5. The vertical limiting part 62 includes two opposing arc-shaped structures, and the opposing surfaces of the arc-shaped structures are inclined, as shown in the lower view of Figure 9. The opposing surfaces of the opposing arc-shaped structures form a trumpet-shaped limiting area, which is used to limit the longitudinal ribs in the left and right directions, improve the accuracy of the longitudinal rib position, and ensure the quality of welding.

[0032] Referring to Figure 4, the drive component 8 includes a meshing gear ring 81 and a linear rack 82, as well as a drive source 83 that controls the linear movement of the linear rack 82. The drive source 83 is mounted on the mounting base 10. The linear rack 82 is slidably mounted on the mounting base 10 via a slide rail structure. The gear ring 81 is fixed on the rotating base 4. The drive source 83 pushes the linear rack 82 to slide back and forth, thereby controlling the reciprocating rotation of the rotating base 4. The drive source 83 is a hydraulic cylinder.

[0033] Referring to Figures 6, 8, and 10, both the rotating seat 4 and the rotating component 5 are columnar structures, and the diameter of the rotating component 5 is smaller than the diameter of the rotating seat 4. The rotating component 5 penetrates the rotating seat 4 radially, and a limiting structure 9 is provided at the junction of the rotating component 5 and the rotating seat 4, as shown in the upper view of Figure 9. When the rotating seat 4 rotates to the point where the rotating component 5 is in a vertical position, the limiting structures 9 are distributed vertically and form two limiting points to limit the rotation range of the rotating component 5. As shown in Figure 10, the limiting structure 9 includes a limiting head 91 fixed on the rotating part 5 and a limiting groove 92 opened on the rotating seat 4. The limiting groove 92 limits the limiting head 91, thereby limiting the rotation range of the rotating part 5. When the rotating part 5 rotates 90 degrees and the pressing head 6 switches to the second posture, the limiting groove 92 will limit the limiting head 91, preventing the rotating part 5 from continuing to rotate in the original direction. As a result, when the pressing head 6 presses down on the lower longitudinal rib 200, it blocks the rotation of the rotating part 5 and stably completes the pressing work.

[0034] 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.

[0035] 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.

[0036] 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 gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding, comprising a U-shaped bar retainer, an outer longitudinal bar retainer, and an inner longitudinal bar retainer, characterized in that: It also includes a rotary clamping mechanism respectively disposed above the upper longitudinal rib and below the lower longitudinal rib. The rotary clamping mechanism includes: a rotary seat; a plurality of rotating parts, spaced apart along the axial direction of the rotary seat and rotatably mounted on the rotary seat; a plurality of clamping heads, corresponding one-to-one with the rotating parts and fixedly connected; an attitude control structure for controlling the rotation of the rotating parts during the rotation of the rotary seat, so that the clamping heads switch between a first attitude and a second attitude; and a driving component for driving the rotary seat to reciprocate. In the first attitude, the clamping head can pass through the gap between adjacent longitudinal ribs as the rotary seat rotates; in the second attitude, the clamping head contacts and clamps the longitudinal rib as the rotary seat rotates, so that the longitudinal rib abuts against the U-rib; the clamping head completes the passing and clamping actions sequentially within the same rotation stroke.

2. The gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 1, characterized in that: Both the rotating base and the rotating component are columnar structures, and the diameter of the rotating component is smaller than the diameter of the rotating base. The rotating component penetrates the rotating base radially, and a limit structure is provided at the junction of the rotating component and the rotating base to limit the rotation range of the rotating component.

3. A gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 1 or 2, characterized in that: The attitude control structure includes a fixed arc-shaped rack segment with limit segments on both sides; a gear and a limit block fixedly mounted on the rotating component. As the rotating seat rotates, the gear passes through the arc-shaped rack segment, and the two mesh to control the rotation of the rotating component. The limit block passes through the limit segment as the rotating seat rotates, and inhibits the rotation of the rotating component under the limit of the limit segment. The limit segment's limitation of the limit block does not occur simultaneously with the meshing of the gear and the arc-shaped rack segment.

4. The gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 1, characterized in that: The clamping head includes a horizontal clamping part and a vertical limiting part, the vertical limiting part being used to limit the longitudinal ribs.

5. The gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 4, characterized in that: The vertical limiting part includes two opposing arc-shaped structures, and the opposing surfaces of the arc-shaped structures are inclined to form a trumpet-shaped limiting area, which limits and constrains the position of the longitudinal ribs.

6. The gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 1, characterized in that: The driving component includes a meshing toothed ring and a linear rack, and a driving source for controlling the linear movement of the linear rack. The toothed ring is fixed on a rotating base.

7. A gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 2, characterized in that: The limiting structure includes a limiting head fixed on the rotating component and a limiting groove formed on the rotating seat. The limiting groove limits the limiting head, thereby limiting the rotation range of the rotating component.

8. The gantry-type U-shaped steel bar and longitudinal bar clamping fixture based on steel bar cage welding according to claim 3, characterized in that: The limiting block has a cube structure.

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