A double-machine-head bending forming equipment for U-shaped steel bars of bottom web steel bar framework

Abstract

This invention provides a double-head bending and forming device for U-shaped steel bars used in bottom and web reinforcement cages, belonging to the field of U-shaped steel bar bending and forming technology. It includes a bending table, a first bending head, a second bending head, and a constraint structure. This double-head bending and forming device for U-shaped steel bars used in bottom and web reinforcement cages reciprocates along two intersecting straight lines whose included angle matches the angle between the bottom reinforcement and web reinforcement sections after forming. All bending points of the U-shaped stirrups are rationally distributed along these two straight lines. During the bending process, the steel bar to be bent is first divided into two movable bending sections located on both sides of the central section. This allows the steel bar to be bent to be placed only once during the entire bending process without requiring overall movement or flipping. This significantly improves the efficiency and stability of integrated bending and forming of U-shaped steel bars, and effectively enhances the forming accuracy, consistency, and overall regularity of the finished product, making it suitable for efficient, large-scale automated production.

Description

Technical Field

[0001] This invention relates to the field of U-shaped steel bar bending and forming technology, specifically to a double-head bending and forming equipment for U-shaped steel bars used in bottom web steel bar skeletons. Background Technology

[0002] The bottom and web reinforcement cage is a pre-tied, three-dimensional steel mesh structure typically used to form the bottom and web (side) of concrete beams. U-shaped bars, as an important component of the bottom and web reinforcement cage, usually consist of one section of bottom slab stirrups and two sections of web stirrups (e.g., Figure 12 (As shown). This type of U-shaped steel bar is used extensively in the bottom web reinforcement cage and has a relatively complex structure.

[0003] In traditional manufacturing methods, bending equipment is typically used to separately bend and shape the bottom plate stirrups and web plate stirrups in batches. These are then manually positioned, assembled, and welded into a single structure. This method not only involves fragmented processes and a slow production cycle, but also results in high labor costs, low production efficiency, and difficulty in ensuring the consistency and overall regularity of the finished products. It is increasingly failing to meet the requirements of concrete components for both production efficiency and finished product quality.

[0004] Therefore, some existing technologies integrate and optimize the two web stirrups and one bottom slab stirrup, forming a "U"-shaped stirrup by bending a single steel bar in one piece. In actual production, a single-bend head multi-point sequential bending device is usually used to achieve automated bending and forming of the U-shaped stirrup (its forming structure is usually as follows). Figure 13 (As shown). This solution avoids manual assembly, results in high-quality finished products, and can be further integrated with automated welding equipment to improve overall production efficiency and automation levels.

[0005] However, in the process of multi-point sequential bending of a single bend, the bending action is usually completed sequentially from one end of the rebar to the other. To coordinate the formation of multiple bending points, the rebar needs to be frequently moved or rotated as a whole during the bending process. This complex movement path easily introduces cumulative errors, affecting the forming accuracy. Furthermore, during the bending process, when the rebar crosses over itself, it often can only cross the already formed portion from the top. After multi-point sequential bending, the ends of the rebar are distributed in different lateral positions, and it is difficult to ensure that the two web stirrups are in the same plane, resulting in poor overall regularity. This non-coplanarity and poor regularity defect easily affects the accuracy and quality of subsequent welding and assembly, thus weakening the overall stability of the bottom web rebar skeleton and the quality of the finished product. These problems are more easily amplified in mass production and automated production scenarios.

[0006] In addition, existing technologies also include rebar bending equipment using double-bend or multi-bend structures. Double-bend equipment often employs a symmetrical arrangement, suitable for simple symmetrical components. For U-shaped stirrups, existing double-bend bending schemes typically still require overall movement or flipping of the workpiece to be bent, or the coordination of individual bends during bending. Multi-bend equipment, on the other hand, usually requires multiple bend points with bends arranged in a predetermined sequence to complete the bending operation. While this can reduce or eliminate movement of the rebar to be bent, improving the stability of the bending process, the overall equipment structure is complex, making it difficult to increase the processing cycle time and thus failing to meet the demands of efficient, large-scale automated production. Summary of the Invention

[0007] This invention provides a double-head bending and forming device for U-shaped steel bars in a bottom and web reinforcement cage, including a bending table, a first bending head, a second bending head, and a constraint structure. The bending table supports the steel bar to be bent. The first bending head reciprocates along a first straight line, and the second bending head reciprocates along a second straight line. The first and second straight lines intersect and form an angle, which corresponds to the angle formed between the bottom reinforcement and the web reinforcement in the formed steel bar. The bending table has several first bending positions spaced apart along the first straight line and several bending positions spaced apart along the second straight line, with one second bending position located on the first straight line. The intersection of the first and second straight lines serves as the initial bending position for the rib to be bent. During the forming bending process, the second bending head first completes the bending at the initial bending position. The constraint structure is used to limit and constrain the middle section of the rib to be bent during the bending process. The middle section corresponds to a part of the forming bottom rib. This part is located directly between the two web ribs in the forming state and is formed by bending the rib to be bent integrally with the two web ribs. The middle section corresponds to the bending formation by the initial bending position and the adjacent first bending position, and the middle section divides the rib to be bent into two movable bending parts located on both sides of the middle section.

[0008] In one possible implementation, the number of first bend positions is six, and the six bend points corresponding to the six first bend positions correspond to bend areas that are sequentially preset from one end of the rib to be bent toward the corresponding middle section of the rib; the number of second bend positions is five, and the five bend points corresponding to the five second bend positions correspond to bend areas that are sequentially preset from the other end of the rib to be bent toward the corresponding middle section of the rib.

[0009] In one possible implementation, the six first bends are sequentially arranged along the first straight line towards the initial bend position as No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6, and the five second bend positions are sequentially arranged along the second straight line towards the initial bend position as No. 7, No. 8, No. 9, No. 10 and No. 11. The first bend head and the second bend head are completed synchronously in pairs according to the bend points corresponding to No. 1 and No. 7, No. 2 and No. 8, No. 3 and No. 9, No. 4 and No. 10.

[0010] In one possible implementation, the bending table is provided with a first movable groove along a first straight line direction and a second movable groove along a second straight line direction. The first movable groove is for the movement of the first bending head, and the second movable groove is for the movement of the second bending head. The first movable groove and the second movable groove are not connected. The bending table portion between them is used to receive and limit the middle section of the rib to be bent.

[0011] In one possible implementation, the constraint structure limits and fixes the middle section of the rib to be bent in a direction perpendicular to the first straight line and abuts the middle section against the corresponding bending table portion between the first movable groove and the second movable groove.

[0012] In one possible implementation, the bending table is provided with a limiting structure to limit and guide the movable rib to be bent during the bending process of the web rib, so that the corresponding part overlaps with the middle section from the top.

[0013] In one possible implementation, the number of limiting structures is two, each corresponding to one of the two rib sections. When the rib section is bent and formed, the limiting structures limit the corresponding part of the rib to be bent from below. The two limiting structures do not interfere with each other during the bending and forming process of the corresponding rib section.

[0014] In one possible implementation, the limiting structure is an arc-shaped block with a wedge-shaped top surface.

[0015] In one possible implementation, the constraint structure includes a gantry with a robotic arm for grasping a fixed length of rib to be bent and placing its middle section on a corresponding bending table portion between a first movable slot and a second movable slot.

[0016] 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 double-head bending and forming device for U-shaped steel bars for bottom and web reinforcement skeletons is provided. By setting the first bending head and the second bending head to move back and forth along two intersecting straight lines with the included angle being consistent with the included angle between the bottom reinforcement part and the web reinforcement part after forming, and rationally distributing all bending points of the U-shaped stirrups to the two straight lines, the second bending head completes the bending before the initial bending position and fixes the middle section with the help of the limiting constraint structure, thereby automatically dividing the reinforcement to be bent into two active bending parts located on both sides of the middle section. Subsequently, only the two bending heads need to bend along their respective straight lines in a preset order to complete the bending of all bending points. This makes it possible to place the reinforcement to be bent only once during the entire bending process without the need for overall movement or flipping. This not only significantly improves the efficiency and stability of the integrated bending and forming of U-shaped steel bars, but also effectively ensures that the two web reinforcement parts after forming are stably in the same plane, thereby improving the forming accuracy, consistency and overall regularity of the finished product, and is suitable for efficient and large-scale automated production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a double-head bending and forming device for U-shaped steel bars used in the bottom web steel reinforcement cage provided in an embodiment of the present invention.

[0018] Figure 2 This is a top view of the bending table of a double-head bending and forming equipment for U-shaped steel bars used in the bottom web steel reinforcement cage provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the forming rib.

[0020] Figure 4 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel reinforcement skeleton of the present invention completes the bending process at the corresponding bending point at the eleventh second bending position.

[0021] Figure 5 This is a schematic diagram showing the change in the state of the U-shaped steel bar double-head bending and forming equipment for bottom web steel reinforcement cage provided in an embodiment of the present invention. The first bending head is at the first bending position and the second bending head is at the seventh bending position. The bending process is completed simultaneously at the corresponding bending point.

[0022] Figure 6 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel reinforcement skeleton of the present invention is completed simultaneously at the second bending position and the second bending head at the eighth bending position.

[0023] Figure 7 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel reinforcement skeleton of the present invention is completed simultaneously at the first bending position at No. 3 and the second bending head at the second bending position at No. 9.

[0024] Figure 8 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel reinforcement skeleton of the present invention is completed simultaneously at the first bending position at position four and the second bending head at the second bending position at position ten.

[0025] Figure 9 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel reinforcement skeleton of the present invention completes the bending process at the corresponding bending point at the No. 5 first bending position.

[0026] Figure 10 This is a schematic diagram showing the change in the state of the U-shaped steel bar to be bent before and after the first bending head of the double-head bending forming equipment for the bottom web steel bar skeleton, provided in an embodiment of the present invention, completes the bending process at the corresponding bending point at the sixth first bending position.

[0027] Figure 11 This is a schematic diagram of the position state of the limiting structure of a double-head bending and forming equipment for U-shaped steel bars in a bottom web steel bar skeleton provided in an embodiment of the present invention.

[0028] Figure 12 This is a structural diagram of a U-shaped stirrup formed using traditional manufacturing methods.

[0029] Figure 13 This is a schematic diagram of the structure of a U-shaped stirrup made by sequential bending at multiple points using a single bend.

[0030] In the diagram: 1. Bending table; 2. First bending head; 3. Second bending head; 4. Constraint structure; 41. Robot arm; 42. Gantry frame; 5. Limiting structure; 6. First movable groove; 7. Second movable groove; 100. Rib to be bent; 101. Middle section; 200. Forming rib; 201. Bottom rib section; 202. Web rib section; 300. Straightening and cutting machine. Detailed Implementation

[0031] 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.

[0032] Please see Figure 1 , Figure 2 and Figure 3 A double-head bending and forming device for U-shaped steel bars for bottom and web reinforcement cages includes a bending table 1, a first bending head 2, and a second bending head 3. A first movable groove 6 is formed along a first straight line direction on the bending table 1, and a second movable groove 7 is formed along a second straight line direction. The first bending head 2 reciprocates within the first movable groove 6 along the first straight line direction, and the second bending head 3 reciprocates within the second movable groove 7 along the second straight line direction. The first straight line direction and the second straight line direction intersect and form an angle, which is the same as the angle between the bottom reinforcement portion 201 and the web reinforcement portion 202 in the forming reinforcement 200.

[0033] There are six first bend positions spaced apart in the first straight direction, and five second bend positions spaced apart in the second straight direction, for a total of eleven bend positions, corresponding to eleven bend points. These eleven bend points are all the bend points required to bend the straight rib 100 into a U-shaped forming rib 200. The first bending head 2 completes the bending at the corresponding bend point at each of the six first bend positions, and the second bending head 3 completes the bending at the corresponding bend point at each of the five second bend positions.

[0034] See Figures 1-10 The six first bend positions in the first straight line direction are numbered 1, 2, 3, 4, 5, and 6 from left to right. The five second bend positions in the second straight line direction are numbered 7, 8, 9, 10, and 11 from front to back. The 11th second bend is located at the intersection of the first and second straight lines, serving as the initial bend position of the reinforcing bar 100 to be bent. The area between the 11th second bend position and the 6th first bend position corresponds to the middle section 101 of the reinforcing bar 100 to be bent, which corresponds to a portion of the formed bottom reinforcing bar portion 201 (e.g., ...). Figure 2 As shown), this part is located directly between the two rib sections 202 in the formed state, and is integrally formed by bending the rib 100 to be bent together with the two rib sections 202. Furthermore, a constraint structure 4 is provided above the bending table 1 to limit and constrain the middle section 101, so that the middle section 101 divides the rib 100 to be bent into two movable bending parts located on both sides of the middle section 101.

[0035] The specific bending process is as follows: S1: Place the fixed-length rib 100 to be bent at the preset position on the bending table 1, so that the middle section 101 is located between the eleventh second bending position and the sixth first bending position. The constraint structure 4 restricts the degree of freedom of the middle section 101 in the first straight line direction, the horizontal direction perpendicular to the first straight line direction, and the vertical direction.

[0036] S2: The second bend head 3 first completes the bend at the corresponding bend point at the eleventh second bend position, dividing a long rib to be bent 100 into two movable bend sections located on both sides of the middle section 101 (e.g., Figure 4 As shown), a preliminary bend of the abdominal muscle section 202 was also completed.

[0037] S3: The second bending head 3 moves forward along the second straight line to the seventh second bending position and completes the bending at the corresponding bending point. At the same time, the first bending head 2 completes the bending at the first bending position (e.g., Figure 5 (As shown).

[0038] S4: The second bending head 3 moves backward along the second straight line to the eighth second bending position and completes the bending at the corresponding bending point. At the same time, the first bending head 2 moves to the right along the first direction to the second first bending position and completes the bending at the corresponding bending point (e.g., Figure 6 (As shown).

[0039] S5: The second bending head 3 moves backward along the second straight line to the ninth second bending position and completes the bending at the corresponding bending point. At the same time, the first bending head 2 moves to the right along the first direction to the third first bending position and completes the bending at the corresponding bending point (e.g., Figure 7 (As shown).

[0040] S6: The second bending head 3 moves backward along the second straight line to the tenth second bending position and completes the bending at the corresponding bending point. At the same time, the first bending head 2 moves to the right along the first direction to the fourth first bending position and completes the bending at the corresponding bending point (e.g., Figure 8 (As shown).

[0041] S7: The first bending head 2 continues to move to the right along the first direction to the fifth first bending position to complete the bending at the corresponding bending point (e.g. Figure 9 As shown), then continue moving to the right to the sixth bend position to complete the bend at the corresponding bend point (as shown). Figure 10 (As shown). At this point, a straight rib 100 to be bent is bent and processed into an integrated U-shaped rib 200.

[0042] This invention rationally distributes all bending points required for bending the forming rib 200 onto two intersecting straight lines, and the included angle between the two straight lines is the same as the included angle between the bottom rib portion 201 and the web rib portion 202 in the forming rib 200. The bending process is performed by the first bending head 2 and the second bending head 3 reciprocating along their respective straight lines. During the entire bending process, only one placement of the rib 100 to be bent is required; there is no need to move or flip the rib 100 as a whole. This allows for efficient and stable integrated bending of the U-shaped forming rib 200. In the forming and bending process, the second bending head 3 first bends at the corresponding bending point at the initial bending position, and combined with the constraint structure 4 on the middle section 101, quickly and stably divides the rib to be bent 100 into two movable bending parts located on both sides of the middle section 101. Then, the first bending head 2 and the second bending head 3 perform bending work synchronously and efficiently. On the basis of ensuring bending efficiency, the stability of the bending process is effectively improved, and the web rib part 202 formed after bending is stably located in the same plane, ensuring the bending quality and the regularity of the finished product.

[0043] Among them, the first bending head 2 and the second bending head 3 are existing and independent steel bar bending mechanisms, and their reciprocating movement is controlled by a set of servo drive systems respectively.

[0044] See Figure 1 and Figure 2 The first movable groove 6 and the second movable groove 7 are not connected, and the bending table 1 between them is used to receive the reinforcing bar 100 to be bent. The constraint structure 4 includes a gantry frame 42 and a robot arm 41 that can move left and right along it. To further achieve automation, a straightening and cutting machine 300 is also configured on the left side of the bending table 1 to straighten the reinforcing bar and cut it into fixed lengths of reinforcing bar 100 to be bent. Its working process is as follows: First, the robot arm 41 moves to the left to the discharge port of the straightening and cutting machine 300 and grabs the middle section 101 of the newly cut reinforcing bar 100 to be bent. Then, the robot arm 41 carries the reinforcing bar 100 to be bent to the right and positions it above the bending table 1 between the first movable groove 6 and the second movable groove 7. Subsequently, the robot arm 41 moves down and places the reinforcing bar 100 against the bending table 1. At this time, the middle section 101 is limited and fixed in the area between the first movable groove 6 and the second movable groove 7. At this point, the middle section 101 of the rib to be bent 100 is fixed between the robot arm 41 and the bending table 1. With this fixed position, subsequent bending operations can begin. By limiting the middle section 101 between the robot arm 41 and the bending table 1 between the first movable slot 6 and the second movable slot 7, not only is the automatic picking and placing of the rib to be bent 100 convenient, but the invention also enables stable and efficient bending and forming of U-shaped stirrups with the same structure but different dimensions within a certain range. Furthermore, to improve the stability of the gripping and transfer process, two additional robot arms 41 are provided, such as... Figure 2 As shown, the two additional robotic arms 41 are located on the left and right sides of the original robotic arm 41, respectively. All three robotic arms 41 are mounted on a translational base, which is then moved left and right onto the gantry frame 42. When gripping the rib 200 to be bent, the three robotic arms 41 move synchronously, increasing the force points to smoothly deliver the rib 200 to the preset position. After reaching the position, the robotic arms 41 on the left and right sides release their gripping state, leaving only the middle robotic arm 41 to continue to limit and fix the middle section 100 of the rib 100 to be bent on the bending table 1.

[0045] See Figures 1-11 A limiting structure 5 is provided on the bending table 1 to limit and guide the movable rib 100 to be bent during the bending process of the two rib sections 202, allowing the movable rib 100 to cross the already formed middle section 101 from above, further ensuring the stability of the bending process of the two rib sections 202 and keeping them stably in the same plane. Figure 2 As shown, there are two limiting structures 5. The two limiting structures 5 correspond to the bending and forming processes of the two rib sections 202. This forming process is the bending and forming process on the middle section 101 where the movable rib to be bent 100 needs to partially overlap. That is, in S6, the second bending head 3 completes the bending at the corresponding bending point at the tenth second bending position. During the bending process, part of the movable rib to be bent 100 needs to overlap on the middle section 101. Before overlapping, the movable rib to be bent 100 first passes through the corresponding limiting structure 5, and under its limiting guidance, it smoothly overlaps on the middle section 101. Above, after bending, one rib section 202 is bent and formed. In the other section, S7, the first bending head 2 completes the bending at the corresponding bending point at the fifth bending position. Similarly, during the bending process, some of the movable ribs to be bent 100 need to overlap on the middle section 101. Before overlapping, the movable ribs to be bent 100 pass through the corresponding limiting structure 5, and under its limiting guidance, smoothly overlap on top of the middle section 101. Finally, after the first bending head 2 completes the bending at the corresponding bending point at the sixth bending position, the other rib section 202 is bent and formed. This effectively avoids impacts during bending, ensures the smoothness of the bending process, and ensures that the two rib sections 202 can be stably placed on the same plane.

[0046] Specifically, by rationally arranging the installation positions of the two limiting structures 5, each limiting structure 5 is positioned outside the movement coverage area of ​​the movable rib 100 to be bent in another bending step during the corresponding bending step, thereby avoiding mutual interference between the limiting structures 5 in different bending steps. Combined with... Figure 8 , Figure 9 and Figure 11As shown, during the S6 bending process, the corresponding movable rib 100 to be bent is simultaneously limited by the right-side limiting structure 5 and located outside the activity coverage area of ​​the corresponding movable rib 100 during the S7 bending process. Similarly, during the S7 bending process, the corresponding movable rib 100 to be bent is simultaneously limited by the right-side limiting structure 5 and located outside the activity coverage area of ​​the corresponding movable rib 100 during the S6 bending process. Furthermore, the limiting structure 5 is an arc-shaped block with a wedge-shaped top surface, and the top surface of the wedge gradually tilts upward in the bending direction of the corresponding movable rib 100 to be bent.

[0047] 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.

[0048] 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.

[0049] 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 double-head bending and forming device for U-shaped steel bars used in bottom and web reinforcement cages, characterized in that: Includes a bending table, used to support the bars to be bent; The first bend head moves back and forth along the first straight line direction; The second bend head moves back and forth along the second straight line direction; The first straight line direction intersects with the second straight line direction and forms an angle, the angle corresponding to the angle formed by the bottom rib part and the web rib part in the forming rib; A number of first bending positions are spaced apart along the first straight line direction and a number of bending positions are spaced apart along the second straight line direction on the bending table; One of the second bending positions is located at the intersection of the first straight line direction and the second straight line direction, and serves as the initial bending position of the rib to be bent. During the forming bending process, the second bending head first completes the bending at the initial bending position. A constraint structure is used to limit and constrain the middle section of the rib to be bent during the bending process. The middle section corresponds to a part of the forming bottom rib part. In the forming state, this part is directly located between the two web rib parts and is formed by bending the two web rib parts together with the rib to be bent. The bending table is provided with a first movable groove along the first straight line direction and a second movable groove along the second straight line direction. The first movable groove is provided for the movement of the first bending head, and the second movable groove is provided for the movement of the second bending head. The first movable groove and the second movable groove are not connected. The bending table part between them is used to support and limit the middle section of the rib to be bent. The constraint structure limits and fixes the middle section of the rib to be bent in a direction perpendicular to the first straight line, and places the middle section against the corresponding bending table part between the first movable groove and the second movable groove. The central section is formed by the initial bending position and the adjacent first bending position participating in the bending, and the central section divides the reinforcing bar to be bent into two active bending parts located on both sides of the central section.

2. The double-head bending and forming equipment for U-shaped steel bars in the bottom web reinforcement cage according to claim 1, characterized in that: The number of first bending positions is six, and the six bending points corresponding to the six first bending positions correspond to the bending areas that are sequentially preset from one end of the rib to be bent toward the corresponding middle section of the rib; the number of second bending positions is five, and the five bending points corresponding to the five second bending positions correspond to the bending areas that are sequentially preset from the other end of the rib to be bent toward the corresponding middle section of the rib.

3. The double-head bending and forming equipment for U-shaped steel bars in the bottom web reinforcement cage according to claim 2, characterized in that: The six first bending positions are sequentially arranged as No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6 along the first straight line direction towards the initial bending position. The five second bending positions are sequentially arranged as No. 7, No. 8, No. 9, No. 10 and No. 11 along the second straight line direction towards the initial bending position. The first bending head and the second bending head are bent synchronously in pairs according to the bending points corresponding to No. 1 and No. 7, No. 2 and No. 8, No. 3 and No. 9, No. 4 and No.

10.

4. A double-head bending and forming equipment for U-shaped steel bars for bottom and web reinforcement cages according to any one of claims 1-3, characterized in that: The bending platform is equipped with a limiting structure to limit and guide the movable rib to be bent during the bending process of the rib section, so that the corresponding part overlaps with the middle section from the top.

5. The double-head bending and forming equipment for U-shaped steel bars in the bottom web reinforcement cage according to claim 4, characterized in that: The number of limiting structures is two, each corresponding to one of the two rib sections. When the rib section is bent and formed, the corresponding part of the rib to be bent is limited from below. The two limiting structures do not interfere with each other in the bending and forming process of the corresponding rib section.

6. The double-head bending and forming equipment for U-shaped steel bars for bottom and web reinforcement cages according to claim 5, characterized in that: The limiting structure is an arc-shaped block with a wedge-shaped top surface.

7. The double-head bending and forming equipment for U-shaped steel bars for bottom and web reinforcement cages according to claim 1, characterized in that: The constraint structure includes a gantry frame equipped with a robotic arm, which is used to grasp a fixed length of rib to be bent and place its middle section on the corresponding bending table portion between the first movable slot and the second movable slot.

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