Steel bar bending head with pre-clamping function

Abstract

The utility model discloses a steel bar bending head with pre-clamping and a steel bar bender, the steel bar bending head comprises a middle shaft plate, a bending disc and a pre-clamping assembly, the pre-clamping assembly comprises a spring, a clamping slide block, a first inner plate, a second inner plate and a one-way rack; when the bending disc is located at the initial position, the bending disc bearing abuts against the second inner plate, and the second inner plate and the clamping sliding block are made to be away from the supporting mandrel. When the bending disc rotates to the reinforcing steel bar and applies pressure, the bending disc bearing is separated from the second inner plate, the spring drives the clamping sliding block to move towards the supporting mandrel to clamp the reinforcing steel bar, the first inner plate is pushed to move towards the one-way rack through the inclined face, the meshing part is made to be meshed with the one-way rack, and the clamping sliding block is locked. Before the steel bar is bent, the steel bar can be clamped by the pre-clamping component, so that the steel bar can be automatically pre-clamped and loosened when being bent, the steel bar can be prevented from falling off and rotating and deforming when being bent, and the bending stability and precision are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of steel bar processing equipment, in particular to a steel bar bending head with pre-clamping. BACKGROUND

[0002] Steel bar bending machine is an essential equipment in the process of steel bar construction. The working principle of steel bar bending machine is to place the steel bar in a specific position by a horizontal working disc rotating on a vertical shaft, and to realize the bidirectional bending of the steel bar by the cooperation of the center pin shaft and the bending pin shaft, as well as the forward and reverse rotation of the motor. However, during this process, if the steel bar is not fixed and constrained enough, a series of problems will be caused.

[0003] Firstly, the steel bar may fall off during the bending process due to insufficient fixation. This usually happens when one end of the steel bar is not firmly inserted into the gap of the rotating disc fixing pin, or the machine body fixing pin is not correctly placed on the side that blocks the steel bar. When the disc rotates, the steel bar is easily slipped out of or bounced out of the machine due to the lack of necessary support and constraint, causing safety hazards.

[0004] Secondly, bending head deformation is also one of the common problems. This is mainly due to the fact that during the bending process, if the position of the steel bar shifts, the force on the steel bar is uneven or too large, causing the deformation of the bending head part. If the steel bar is not correctly fixed on the machine, or the core shaft and forming shaft used are not suitable in specification, the risk of bending head deformation will be increased. Such deformation not only affects the quality and use effect of the steel bar, but also may cause potential safety hazards to subsequent construction.

[0005] Therefore, during the steel bar processing, it is crucial to ensure that the steel bar bending machine has sufficient fixation and constraint on the steel bar. This not only improves the processing efficiency and quality, but also effectively avoids the occurrence of problems such as steel bar falling off and bending head deformation. CONTENT OF THE INVENTION

[0006] In view of the above problems, the present application provides a steel bar bending head with pre-clamping to solve the technical problems of easy falling off and shifting of the steel bar during bending.

[0007] To achieve the above purpose, the present application provides a steel bar bending head with pre-clamping, which is arranged on a steel bar bending machine and used for bending processing of a steel bar. The steel bar bending head with pre-clamping comprises:

[0008] a center shaft plate provided with a support core shaft to support the steel bar during the steel bar bending process;

[0009] A bending disc is coaxially arranged with the central shaft plate and is driven to rotate around the supporting core shaft by a driving device, and a bending disc bearing is arranged on the bending disc and rotates around the supporting core shaft synchronously with the bending disc to apply a bending force to the steel bar;

[0010] A pre-clamping assembly includes a spring, a clamping slider, a first inner plate, a second inner plate, and a one-way rack;

[0011] The clamping slider is slidably arranged in a concave groove on the central shaft plate and can approach and move away from the supporting core shaft;

[0012] The spring is in abutment with the clamping slider and is used to provide a clamping force directed to the supporting core shaft to the clamping slider;

[0013] The clamping slider is provided with a mounting groove to accommodate the first inner plate and the second inner plate, the first inner plate and the second inner plate are arranged in layers and are connected by a bevel, the bevel includes a bevel two arranged on the inner surface of the first inner plate and a bevel one arranged on the outer surface of the second inner plate, the bevel one and the bevel two are in abutment, and the second inner plate is provided with an engaging part adapted to the one-way rack, and each tooth of the one-way rack is inclined toward the direction in which the supporting core shaft is located;

[0014] When the bending disc is in an initial position, the bending disc bearing is in abutment with the second inner plate, so that the second inner plate and the clamping slider move away from the supporting core shaft;

[0015] When the bending disc rotates to press the steel bar, the bending disc bearing is separated from the second inner plate, the clamping slider moves to the supporting core shaft to clamp the steel bar, and the first inner plate moves to the one-way rack, so that the engaging part engages with the one-way rack to lock the clamping slider.

[0016] Further, the pre-clamping assembly further includes a magnet, the magnet is arranged on the bending disc adjacent to the bending disc bearing, and in the direction in which the bending disc rotates forward, the magnet approaches the steel bar relative to the bending disc bearing, and the magnet is used to pre-fix the steel bar by magnetic force before the clamping slider clamps the steel bar.

[0017] Further, the outer periphery of the magnet is wrapped with a magnet sleeve.

[0018] Further, the length direction of the first inner plate and the length direction of the second inner plate are perpendicular to each other, one end of the length direction of the first inner plate is connected with the clamping slider platform, and the other end of the length direction of the first inner plate is provided with the engaging part.

[0019] Further, the spring is in abutment with the top end of the clamping slider, and the bottom end of the clamping slider is provided with anti-skid teeth for contacting the steel bar.

[0020] Further, the top end of the spring is provided with a spring cover.

[0021] Further, the included angle between the inclined surface and the sliding direction of the clamping slider is 35-55 degrees.

[0022] Further, the support mandrel is a flat shaft body, which comprises an end face and a steel bar support face for supporting the steel bar, and the steel bar support face is a plane and is located on the side opposite to the clamping slider of the flat shaft body.

[0023] Further, the middle part of the steel bar support face is provided with a V-shaped groove, the extending direction of the V-shaped groove is the same as the extending direction of the steel bar, and the middle part of the V-shaped groove is provided with a magnet for pre-fixing the steel bar.

[0024] Distinguished from the prior art, the above technical solution has a pre-clamping steel bar bending head, which comprises a middle shaft plate, a bending disc and a pre-clamping assembly, the pre-clamping assembly comprises a spring, a clamping slider, a first inner plate, a second inner plate and a one-way rack, when the bending disc rotates to press the steel bar, the bending disc bearing is separated from the second inner plate, the spring drives the clamping slider to move to the support mandrel to clamp the steel bar, and the first inner plate is pushed to the one-way rack through the inclined surface to make the meshing part engage with the one-way rack to lock the clamping slider. Therefore, in the technical solution, the steel bar can be clamped by the pre-clamping assembly before bending, so that automatic pre-clamping and relaxation during steel bar bending can be realized, the steel bar can be prevented from falling off during bending, and the steel bar can be prevented from rotating and deforming, so that bending processing is stable and precise.

[0025] The above content related to the utility model is only a summary of the technical solution of the application, in order to enable those skilled in the art to more clearly understand the technical solution of the application, and then can be implemented according to the content recorded in the description and the drawings, and in order to enable the above purpose and other purposes, characteristics and advantages of the application to be more easily understood, the following is described in combination with the specific embodiments of the application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the utility model and other related contents, and cannot be considered as the limitation of the application.

[0027] In the drawings of the specification:

[0028] Figure 1 The structure schematic diagram of the steel bar bending head with pre-clamping is described in the specific embodiments.

[0029] Figure 2 Structure diagram of the steel bar bending head with pre-clamping in the first inner plate hidden state according to the specific embodiment;

[0030] Figure 3 Structure diagram of the steel bar bending head with pre-clamping in the initial position according to the specific embodiment;

[0031] Figure 4 Structure diagram of the steel bar bending head with pre-clamping according to another specific embodiment;

[0032] Figure 5 Structure diagram of the steel bar bending head with pre-clamping according to another specific embodiment; Figure 4 Structure diagram of the steel bar bending head with pre-clamping according to another specific embodiment;

[0033] Figure 6 Structure diagram of the steel bar bending head with pre-clamping according to another specific embodiment.

[0034] The reference signs involved in the above-mentioned drawings are explained as follows:

[0035] 1, spring cover; 2, spring; 3, second inner plate; 4, first inner plate; 5, clamping slider; 101, central shaft plate; 7, magnet sleeve; 8, magnet; 9, bending disc rotating shaft; 10, bending disc bearing; 12, supporting mandrel; 14, concave groove; 141, one-way rack; 32, inclined surface one; 31, sliding groove;

[0036] 51, mounting groove; 41, meshing part; 42, inclined surface two;

[0037] 100, bending disc; 20, steel bar.

[0038] 120, steel bar supporting surface; 121, V-shaped groove;

[0039] 200, telescopic oil cylinder; 300, gear sleeve shaft; DETAILED DESCRIPTION

[0040] In order to describe possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved, etc. of the present application in detail, the following will be described in detail in combination with specific embodiments listed and with the aid of the drawings. The embodiments recorded in this paper are only used to more clearly illustrate the technical schemes of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0041] The term "embodiment" is mentioned in this document means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0042] Unless otherwise defined, the meaning of technical terms used in this document is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms in this document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0043] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this document generally represents that the associated objects before and after are a "or" logical relationship.

[0044] In this application, such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between them.

[0045] In this application, without more limitation, the "includes", "contains", "has" or other similar open expressions used in the statement are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent in such process, method or product.

[0046] As the same understanding as in the "Guidelines for Examination", in this application, "greater than", "less than", "exceed" and other expressions are understood as not including the number; "above", "below", "within" and other expressions are understood as including the number. In addition, the meaning of "multiple" in the description of the embodiments of the present application is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0047] In the description of the embodiments of the present application, the spatial relative expressions such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] Unless otherwise expressly specified or limited, the terms "mount", "connect", "connection", "fixed", "set", and the like used in the description of the embodiments of the present application should be interpreted broadly. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be a communication or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] Please refer to Figures 1 to 6 The present embodiment provides a reinforcing bar bending head with pre-clamping. The reinforcing bar bending head with pre-clamping is arranged on a reinforcing bar bending machine and is used for bending processing of a reinforcing bar 20. When the reinforcing bar 20 is placed into a bending disc 100 for bending processing, the reinforcing bar 20 can be automatically clamped by a clamping sliding block 5 in a pre-clamping assembly in advance, and then a bending disc bearing 10 in the bending disc 100 contacts the reinforcing bar 20 to bend the reinforcing bar 20, thereby avoiding problems such as the reinforcing bar 20 falling off during bending due to the reinforcing bar 20 not being placed in place or being offset.

[0050] As Figure 1 shown, the reinforcing bar bending head with pre-clamping includes a middle shaft plate 101, a bending disc 100, and a pre-clamping assembly.

[0051] The middle shaft plate 101 is provided with a support mandrel 12 to support the reinforcing bar 20 during bending of the reinforcing bar 20; the bending disc 100 is coaxially arranged with the middle shaft plate 101, and the bending disc 100 is driven to rotate around the support mandrel 12 by a driving device. As Figure 5As shown, the bending disc 100 can mesh with the rack on the bending cylinder via the gear sleeve shaft 300, thus driving the bending disc 100 to rotate through the extension and retraction of the bending cylinder. A bending disc bearing 10 is provided on the bending disc 100, and the bending disc bearing 10 is mounted on the bending disc 100 via the bending disc rotating shaft 9. Therefore, the bending disc bearing 10 can rotate on its own axis and can rotate synchronously with the bending disc 100 around the supporting mandrel 12 to apply a bending force to the reinforcing bar 20.

[0052] like Figure 3 As shown, the reinforcing bar 20 to be bent is supported on the support mandrel 12. When the bending disc 100 rotates around the support mandrel 12, the bending disc bearing 10 on the bending disc 100 contacts the reinforcing bar 20 and bends the reinforcing bar 20 as the bending disc 100 continues to rotate.

[0053] The pre-clamping assembly is used to pre-clamp the reinforcing bar 20 before the bending disc bearing 10 contacts the reinforcing bar 20. Figure 1 As shown, the pre-clamping assembly includes: a spring 2, a clamping slider 5, a first inner plate 4, a second inner plate 3, and a one-way rack 141. The clamping slider 5 is disposed opposite to the supporting spindle 12. The clamping slider 5 is mounted on the central shaft plate 101 and can slide relative to the supporting spindle. A concave groove 14 is provided on the central shaft plate 101 to slide in cooperation with the clamping slider 5, thereby limiting the clamping slider 5 to slide only in the direction approaching or away from the supporting spindle. Figure 1 As shown, the clamping slider 5 is positioned above the support spindle 12, and the concave groove 14 engages with the upper middle part of the clamping slider 5. The clamping slider 5 can only slide vertically relative to the central shaft plate 101, and the bottom end of the clamping slider 5 is used to clamp the reinforcing bar 20.

[0054] like Figure 1 As shown, the spring 2 abuts against the clamping slider 5, and the spring 2 provides a clamping force to the clamping slider 5 pointing towards the support spindle 12. A spring cover 1 is provided at the top of the spring 2. The spring cover 1 abuts against the top of the spring 2, which on the one hand protects the spring 2, and on the other hand facilitates the fixation of the top of the spring 2.

[0055] like Figure 2 As shown, the clamping slider 5 is provided with a mounting groove 51 to accommodate the first inner plate 4 and the second inner plate 3. The first inner plate 4 and the second inner plate 3 are stacked and connected by an inclined surface. Wherein, as Figure 2As shown, the second inner plate 3 is provided with a slope 32 and a sliding groove 31 on its outer surface, which is used to fit the first inner plate. The first inner plate 4 is provided with a slope 42 on its back plate (i.e. inner surface), and the slope 32 and the slope 42 are matched, and when the first inner plate 4 is stacked with the second inner plate 3, the slope 32 and the slope 42 are in contact. The slope 32 and the slope 42 are used to convert the relative movement between the first inner plate 4 and the second inner plate 3 in the first direction into a movement component in the second direction which is orthogonal to the first direction. As shown, Figure 1 When the second inner plate 3 moves downward relative to the first inner plate 4, the second inner plate 3 pushes the first inner plate 4 to move horizontally (i.e. to the right) through the slope 32 and the slope 42, so that the engaging part 41 of the first inner plate 4 engages with the one-way rack 141. Figure 2 When the second inner plate 3 moves downward relative to the first inner plate 4, the second inner plate 3 pushes the first inner plate 4 to move horizontally (i.e. to the right) through the slope 32 and the slope 42, so that the engaging part 41 of the first inner plate 4 engages with the one-way rack 141.

[0056] The second inner plate 3 is provided with an engaging part 41 which is matched with the one-way rack 141. As shown, Figure 2 The one-way rack 141 can be provided on the side of the concave groove 14 close to the first inner plate 4, so that when the first inner plate 4 moves towards the one-way rack 141, the engaging part 41 engages with the one-way rack 141. The engaging part 41 is a rack which has the same shape as the one-way rack 141. In this embodiment, the teeth of the one-way rack are inclined towards the direction of the support shaft, as shown, Figure 1 and Figure 2 The teeth on the one-way rack 141 are inclined downward, and the teeth on the engaging part 41 of the first inner plate 4 are inclined upward, so that when the engaging part 41 engages with the one-way rack 141, the first inner plate 4 and the clamping slider 5 can only move downward and cannot move upward. Therefore, the clamping slider 5 can be locked in the clamping state when it clamps the steel bar 20, and cannot move upward due to the force of the steel bar 20.

[0057] As shown, Figure 3 When the bending disc 100 is in the initial position, the bending disc bearing 10 is in contact with the second inner plate 3, so that the second inner plate 3 and the clamping slider 5 move away from the support shaft 12, and the second inner plate 3 drives the first inner plate 4 to separate from the one-way rack 141 through the slope. When the bending disc 100 rotates to press the steel bar, the bending disc bearing 10 separates from the second inner plate 3, the spring 2 drives the clamping slider 5 to move towards the support shaft 12 to clamp the steel bar 20, and the first inner plate 4 is pushed to move towards the one-way rack 141 through the slope, so that the engaging part 41 engages with the one-way rack 141 to lock the clamping slider 5.

[0058] As shown, Figure 1 and Figure 2As shown, the length direction of the first inner plate 4 and the length direction of the second inner plate 3 are perpendicular to each other; one end of the length direction of the first inner plate 4 is connected with the platform of the clamping slider 5, and the other end of the length direction of the first inner plate 4 is provided with the engaging part 41.

[0059] In an embodiment, the pre-clamping assembly further comprises a magnet 8; the magnet 8 is arranged on the curved disc 100 adjacent to the curved disc bearing 10, and in the direction of rotation of the curved disc 100, the magnet 8 is close to the curved disc bearing 10 relative to the steel bar 20; the magnet 8 is used to pre-fix the steel bar 20 by magnetic force before the clamping slider 5 clamps the steel bar 20. A magnet sleeve 7 is also arranged on the outer periphery of the steel bar 20. The magnet sleeve 7 can be used to fix and protect the magnet 8.

[0060] As shown, Figure 3 When the steel bar 20 is bent, the curved disc 100 is first in the initial position, and the steel bar 20 falls from above on the support mandrel 12, and the curved disc rotating shaft 9 is located above the right of the steel bar 20. At this time, the rack below the curved fulcrum slider is at the uppermost position, and does not contact the steel bar 20, and the magnet 8 of the curved disc 100 is at the same height as the steel bar 20, and the steel bar 20 is attracted tightly to achieve the effect of preliminary fixation. The engaging part 41 of the first inner plate 4 is separated from the one-way rack 141 inside the concave groove 14, and at this time the spring 2 is in a compressed state.

[0061] When the curved disc 100 starts to rotate to bend the steel bar 20 (i.e. clockwise rotation in Figure 3 ), the curved disc bearing 10 gradually separates from the second inner plate 3, and the clamping slider 5 moves downward under the action of the spring 2, causing the clamping slider 5 to move downward as a whole, and the bottom end of the clamping slider 5 presses the steel bar 20 (at this time the clamping slider 5 no longer continues to move downward), preventing the steel bar 20 from rotating and deforming; subsequently, the inclined surface one 32 and the inclined surface two 42 push the first inner plate 4 to move to the right, and the engaging part 41 on the right side of the first inner plate 4 engages with the one-way rack 141 inside the concave groove 14, thereby locking the clamping slider 5 in the state of clamping the steel bar 20, avoiding the reverse force of the steel bar 20 from causing the clamping slider 5 to loosen the steel bar 20.

[0062] With the continuous rotation of the curved disc 100, the steel bar 20 is bent and formed, and after reaching the set angle, it is reset in the opposite direction, contacts the second inner plate 3 and is lifted up, the first inner plate 4 is pushed to move to the left by the inclined surface one 32 and the inclined surface two 42, the engaging part 41 on the right side of the first inner plate 4 is separated from the one-way rack 141 inside the concave groove, the clamping slider 5 is pushed to move upward, the steel bar 20 is loosened, and the spring 2 is retracted and reset.

[0063] As shown, Figure 1 and Figure 2As shown, the spring 2 abuts against the top of the clamping slider 5, and the bottom end of the clamping slider 5 is provided with anti-slip teeth for contacting the reinforcing bar 20. The anti-slip teeth can increase the clamping force between the clamping slider 5 and the reinforcing bar 20, and prevent the reinforcing bar 20 from sliding relative to the clamping slider 5.

[0064] In one embodiment, the angle between the inclined plane and the sliding direction of the clamping slider 5 is 35 degrees to 55 degrees, that is, the angle between the inclined plane and the vertical direction is 35 degrees to 55 degrees. Preferably, the angle between the inclined plane and the sliding direction of the clamping slider 5 is 45 degrees.

[0065] like Figure 4 and Figure 5 As shown, another rebar bending head is provided in another embodiment. The difference from the above embodiment is that in the above embodiment, the supporting mandrel of the rebar bending head is a cylindrical mandrel, that is, the cross-section of the supporting mandrel is circular. In this embodiment, the supporting mandrel is a flat shaft. The flat shaft includes an end face and a peripheral side face for supporting the rebar. The side of the peripheral side face opposite to the clamping slider is a plane, that is, the rebar support surface 120 is a plane. The position of the magnet has been adjusted, with the magnet placed on the rebar support surface 120 of the flat shaft. A groove adapted to the shape of the magnet is provided in the middle of the rebar support surface 120, and the magnet is then placed in the groove. This allows the rebar to be attracted to the rebar support surface by the magnet, while preventing the rebar from contacting the magnet and damaging it. In this embodiment, the supporting mandrel has a flat rebar support surface, which increases the contact area between the supporting mandrel and the rebar. At the same time, placing the magnet on the rebar support surface allows for reliable rebar attraction, thereby improving the stability of the rebar clamping.

[0066] like Figure 5 As shown, in the above embodiment, the support mandrel is connected to a telescopic hydraulic cylinder 200 (a telescopic air cylinder can also be used in other embodiments). The telescopic hydraulic cylinder is used to drive the support mandrel to extend and retract axially. After the steel bar is bent, the telescopic hydraulic cylinder 200 controls the support mandrel to retract, so that the steel bar falls off the support mandrel and the bending disc. When it is necessary to bend another steel bar, the telescopic hydraulic cylinder 200 drives the support mandrel to extend forward.

[0067] like Figure 6 As shown, in another embodiment, for Figure 4 and Figure 5 The bent rebar head shown has been further optimized. Specifically, in this embodiment, in... Figure 6On the basis of the shown reinforcing bar bending head, a V-shaped groove 121 is arranged in the middle of the reinforcing bar supporting surface 120 of the supporting mandrel, the extending direction of the V-shaped groove 121 is the same as the direction of the reinforcing bar, and the groove for assembling the magnet 8 is arranged in the middle of the V-shaped groove. When the reinforcing bar falls into the supporting mandrel, the V-shaped groove 121 contacts the side surface of the reinforcing bar, thereby limiting the axial movement of the reinforcing bar along the supporting mandrel, playing a good reinforcing bar limiting role, and further improving the clamping stability of the reinforcing bar on the supporting mandrel.

[0068] In another embodiment, a reinforcing bar bending machine is provided. The reinforcing bar bending machine comprises a frame and a bending head arranged on the frame, and the bending head is the reinforcing bar bending head with pre-clamping according to any one of the above embodiments. In an embodiment, five bending heads are arranged on the frame, i.e., the reinforcing bar bending machine is a five-head reinforcing bar bending machine.

[0069] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any equivalent structure or equivalent flow replacing or modifying the content described in the specification and drawings of the present application based on the essential concept of the present application, and the technical solutions directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included in the patent protection scope of the present application.

Claims

1. A reinforcing bar bending head with pre-clamping, provided on a reinforcing bar bending machine, for bending processing of reinforcing bars; characterized in that, The steel bar bending head with pre-clamping comprises: a middle shaft plate provided with a support shaft to support the steel bar during the bending process; a bending disc coaxially arranged with the middle shaft plate and driven by a driving device to rotate around the support shaft, the bending disc being provided with a bending disc bearing which rotates around the support shaft synchronously with the bending disc to apply a bending force to the steel bar; a pre-clamping assembly comprising a spring, a clamping slider, a first inner plate, a second inner plate and a one-way rack; the clamping slider being slidably arranged in a concave groove on the middle shaft plate and being capable of approaching and moving away from the support shaft; the spring abutting against the clamping slider to provide a clamping force to the clamping slider which is directed to the support shaft; the clamping slider being provided with a mounting groove to accommodate the first inner plate and the second inner plate, the first inner plate and the second inner plate being arranged in layers and being connected by a bevel which comprises a bevel two arranged on the inner surface of the first inner plate and a bevel one arranged on the outer surface of the second inner plate, the bevel one and the bevel two abutting against each other, the second inner plate being provided with an engaging part which is adapted to the one-way rack, the teeth of the one-way rack being inclined towards the direction in which the support shaft is located; when the bending disc is in an initial position, the bending disc bearing abuts against the second inner plate, so that the second inner plate and the clamping slider move away from the support shaft; when the bending disc rotates to press the steel bar, the bending disc bearing separates from the second inner plate, the clamping slider moves towards the support shaft to clamp the steel bar, and the first inner plate moves towards the one-way rack, so that the engaging part engages with the one-way rack to lock the clamping slider.

2. A reinforcing bar bending head with pre-clamping according to claim 1, characterized in that the pre-clamping assembly further comprises a magnet, the magnet being arranged on the bending disc adjacent to the bending disc bearing and being closer to the steel bar than the bending disc bearing in the direction in which the bending disc rotates, the magnet being used to pre-fix the steel bar by magnetic force before the clamping slider clamps the steel bar.

3. A reinforcing bar bending head with pre-clamping according to claim 2, characterized in that the magnet is wrapped with a magnet cover.

4. A reinforcing bar bending head with pre-clamping according to claim 1, characterized in that, the length direction of the first inner plate and the length direction of the second inner plate are perpendicular to each other, one end of the length direction of the first inner plate is connected with the platform of the clamping slider, and the other end of the length direction of the first inner plate is provided with the engaging part.

5. A rebar bending head with pre-clamping according to claim 1, characterized in that, the top end of the spring abuts against the top end of the clamping slider, and the bottom end of the clamping slider is provided with anti-skid teeth for contacting the steel bar.

6. A reinforcing bar bending head with pre-clamping according to claim 5, characterized in that the top end of the spring is provided with a spring cover.

7. A rebar bending head with pre-clamping according to claim 1, characterized in that, the included angle between the bevel and the sliding direction of the clamping slider is 35-55 degrees.

8. A rebar bending head with pre-clamping according to claim 1, characterized in that, the support shaft is a flat shaft body, the flat shaft body comprising an end face and a steel bar support face for supporting the steel bar, the steel bar support face being a plane and being located on the side of the flat shaft body opposite to the clamping slider.

9. A reinforcing bar bending head with pre-clamping according to claim 8, characterized in that the middle part of the steel bar support face is provided with a V-shaped groove, the V-shaped groove extending in the same direction as the steel bar, and the middle part of the V-shaped groove is provided with a magnet for pre-fixing the steel bar.

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