Automatic wire changing mechanism of steel bar automatic hoop bending machine

Abstract

The present invention discloses an automatic wire-changing mechanism for an automatic steel bar bending machine, which belongs to the technical field of steel bar bending hoops and is designed to solve the problems of poor safety of the prior art. The automatic wire-changing mechanism for the automatic steel bar bending machine of the present invention comprises a wire-laying assembly, a motor drive assembly and a feeding assembly; wherein the wire-laying assembly comprises a connecting plate and at least two steel bar clamping units, each steel bar clamping unit comprises a slider and a spring, and a slider wire-entry hole is provided on the slider; the motor drive assembly comprises a wire-entry cylinder, and a wire-entry pressure shaft is installed on the output end of the wire-entry cylinder, and the wire-entry pressure shaft is configured to push the slider to move in the direction of the compression spring until the clamping state of the wire-laying assembly on the steel bar is released. The automatic wire-changing mechanism for the automatic steel bar bending machine of the present invention can arrange multiple steel bars of different diameters side by side for selection at the same time, has high working effect, is easy to use, and the position of the steel bars is accurate and reliable, solving the problems of unsafe and unstable manual wire-changing.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar bending hoops, and in particular to an automatic line changing mechanism of an automatic steel bar bending hoops machine. Background Art

[0002] The steel bar hoop bending machine is a processing equipment used to automatically bend steel bars. During processing, the steel bars need to be placed in the working position, and then the steel bar hoop bending machine can bend them.

[0003] In the prior art, an automatic feeding device is usually used to deliver steel bars to the working position. In order to improve processing efficiency, the automatic feeding device will deliver the next steel bar immediately after the previous steel bar is delivered to the working position. In actual working conditions, the diameter of the required steel bar may change, that is, the diameter of the next steel bar may be larger or smaller than the diameter of the previous steel bar.

[0004] Once the required steel bar diameter changes, the prior art requires the operator to manually take out the steel bars already placed in the preparation position and put the steel bars to be replaced in the designated position. Manual replacement of steel bars has certain safety hazards. Once the steel bar bending machine is misoperated, the operator may be injured; due to the height of the setting and the outer shell blocking, the operator may not be able to clearly see the designated position, resulting in manual replacement cannot ensure that the newly replaced steel bar is in the ideal position; manual replacement of steel bars increases the labor intensity of the operator, takes a long time, and reduces the overall work efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a safe and reliable automatic wire changing mechanism for an automatic steel bar hoop bending machine.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A steel bar automatic hoop bending machine automatic line changing mechanism, comprising a wire-laying assembly for fixing the ends of steel bars of different diameters, a motor drive assembly for driving the steel bars to move, and a feeding assembly for conveying the steel bars to a main machine; wherein the wire-laying assembly comprises a connecting plate, at least two steel bar clamping units are arranged inside or on the connecting plate, each of the steel bar clamping units comprises a slider and a spring, a slider wire-entry hole is provided on the slider along the wire-entry direction of the steel bar; one end of the spring is connected to the slider and is in a compressed state, and the expansion and contraction direction of the spring is perpendicular to the wire-entry direction of the steel bar; a connecting plate wire-entry hole is provided on the connecting plate at a position corresponding to each of the sliders, and when there is no external force pressing on the slider, the spring makes the axis of the connecting plate wire-entry hole aligned with the slider The axis of the wire feeding hole of the block deviates from that of the wire feeding hole; the motor driving assembly comprises a wire feeding cylinder, an output end of which is provided with a wire feeding pressure shaft, and the wire feeding pressure shaft is configured to push the sliding block to move in the direction of compressing the spring until the clamping state of the wire paying-out assembly on the steel bar is released; the feeding assembly comprises a feeding motor, an output end of which is provided with a feeding spindle, and a lower feeding wheel for driving the steel bar to move is sleeved on the feeding spindle; the feeding assembly also comprises a pressing cylinder, an output end of which is provided with a feeding pressure shaft, and the feeding pressure shaft can abut against the slide and push the slide to move in the direction of the lower feeding wheel, and an upper feeding wheel is provided on the slide, and a gap is formed between the lower feeding wheel and the upper feeding wheel to allow the steel bar to pass through.

[0008] In particular, the wire-laying assembly also includes a wire entry plate, which is connected to the connecting plate; an outer plate wire entry hole is opened on the wire entry plate along the wire entry direction of the steel bar, the outer plate wire entry hole and the connecting plate wire entry hole correspond one to one, and the outer plate wire entry hole and the connecting plate wire entry hole are respectively arranged at both ends of the slider wire entry hole.

[0009] In particular, when the steel bar clamping unit is arranged in the connecting plate, a loose cartoon hole is opened on the connecting plate along the extension and contraction direction of the spring, the slider and the spring are both arranged in the loose cartoon hole, and the wire feed pressure shaft is configured to be able to extend into the loose cartoon hole to push the slider to move in the direction of compressing the spring.

[0010] Particularly, one end of the spring is connected to the slider, and the other end abuts against a spring pressure cover, and the spring pressure cover is mounted on the connecting plate.

[0011] In particular, the feeding assembly also includes a support plate, the slide is slidably installed on one side surface of the support plate, and a slide pressure plate is slidably installed on the other side surface of the support plate, the slide pressure plate is connected to the slide, and a slide lifting bolt is arranged on the slide pressure plate; a cylinder bottom plate is arranged on the support plate, a fixing bolt is arranged on the cylinder bottom plate, a tension spring is arranged between the slide lifting bolt and the fixing bolt, and the extension direction of the tension spring is parallel to the extension and contraction direction of the pressing cylinder.

[0012] In particular, a strip-shaped slide opening is opened on the support plate, and the extension direction of the slide opening is consistent with the moving direction of the feed pressure shaft. The feed pressure shaft can extend into the slide opening and push the slide to move toward the lower feed wheel direction; the slide includes an L-shaped slide body and a slide limiting portion located in the slide opening, one end of the slide limiting portion is connected to the end of the slide body, and the other end is connected to the slide pressure plate, and the end of the slide body and the slide pressure plate are respectively attached to the two sides of the support plate; an upper feed wheel shaft is arranged on the slide body, and the upper feed wheel sleeve is arranged on the upper feed wheel shaft.

[0013] In particular, the upper feeding wheel shaft is located between the slide body and the support plate.

[0014] Particularly, the support plate is provided with a long opening for the steel bar to pass through.

[0015] In particular, the motor drive assembly also includes an upper pressing plate and a lower pressing plate respectively arranged at both ends of the connecting plate, a screw, a first guide shaft and a second guide shaft are respectively arranged between the upper pressing plate and the lower pressing plate, the screw and the first guide shaft are located on one side of the connecting plate, and the second guide shaft is located on the other side of the connecting plate; one end of the screw is connected to the lower pressing plate, and the other end is connected to the output end of the driving motor after passing through the upper pressing plate, and the extension direction of the screw is consistent with the arrangement direction of at least two of the steel bar clamping units; the motor drive assembly also includes a cylinder fixing seat, and the cylinder fixing seat is respectively provided with a threaded hole for passing the screw and a light hole for passing the first guide shaft; the cylinder fixing seat is installed on the frame, and the incoming line cylinder is installed on the cylinder fixing seat, and when the screw rotates, it can drive all the steel bar clamping units to move along the screw axis through the upper pressing plate, the lower pressing plate and the connecting plate until the set steel bar clamping unit is aligned with the incoming line pressure shaft.

[0016] In particular, the upper pressing plate and the lower pressing plate are respectively provided with a plurality of connecting holes for passing the screw, the first guide shaft and the second guide shaft, the connecting holes are stepped, and at least one side end of the screw, the first guide shaft and the second guide shaft is stepped, and the stepped ends of the screw, the first guide shaft and the second guide shaft respectively abut against the stepped structure of the connecting holes.

[0017] The automatic line-changing mechanism of the automatic steel bar hoop bending machine of the present invention comprises a line-laying assembly for fixing the ends of steel bars of different diameters, a motor driving assembly for driving the movement of the steel bars, and a feeding assembly for conveying the steel bars to the main machine. At the same time, a plurality of steel bars of different diameters can be arranged side by side for selection. When the steel bars need to be replaced, the original steel bars currently being processed can automatically withdraw from the processing position, and the feeding assembly moves to the position of the new steel bars. The new steel bars are fed into the subsequent processing position by the joint action of the upper feeding wheel and the lower feeding wheel. The working effect is high, the use is convenient, the position of the steel bars is accurate and reliable, and the problems of unsafe and unstable manual line changing are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the automatic wire changing mechanism of the automatic steel bar bending hoop machine provided by the specific embodiment of the present invention in the normal feeding state;

[0019] Figure 2 yes Figure 1 a left side view of the structure shown;

[0020] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0021] Figure 4 yes Figure 1 a top view of the structure shown;

[0022] Figure 5 yes Figure 4 A schematic diagram of the structure shown without the upper shielding object;

[0023] Figure 6 yes Figure 1 A BB-section view of the structure shown;

[0024] Figure 7 It is a structural schematic diagram of the automatic wire changing mechanism of the automatic steel bar bending hoop machine provided by the specific embodiment of the present invention when preparing to replace steel bars;

[0025] Figure 8 yes Figure 7 Left side view of the structure shown. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0027] This embodiment discloses an automatic wire changing mechanism for an automatic steel bar bending machine. Figures 1 to 8 As shown, the automatic wire-changing mechanism of the automatic steel bar hoop bending machine includes a wire-laying assembly for fixing the ends of steel bars 5 of different diameters, a motor drive assembly for driving the steel bars 5 to move, and a feeding assembly for conveying the steel bars 5 to the main machine.

[0028] The wire-laying assembly includes a connecting plate 11, in which or on which at least two steel bar clamping units are arranged, each steel bar clamping unit includes a slider 12 and a spring 13, and the slider 12 is provided with a slider wire entry hole 121 along the wire entry direction of the steel bar 5. One end of the spring 13 is connected to the slider 12, and the other end abuts against a spring pressure cover 15, which is mounted on the connecting plate 11.

[0029] In order to better clamp the steel bars 5 of different diameters, the diameters of the slider wire entry holes 121 on different sliders 12 are correspondingly different; the number of slider wire entry holes 121 provided on each slider 12 is not limited, and can be one, two or more. One end of the spring 13 is connected to the slider 12 and the spring 13 is in a compressed state after installation. The expansion and contraction direction of the spring 13 is perpendicular to the wire entry direction of the steel bars 5, so that the slider 12 can be pushed to move along the wire entry direction perpendicular to the steel bars 5. A connecting plate wire entry hole 111 is provided on the connecting plate 11 at the position corresponding to each slider 12. When there is no external force pressing on the slider 12, the spring 13 makes the axis of the connecting plate wire entry hole 111 deviate from the axis of the slider wire entry hole 121. At this time, the part of the steel bar 5 located in the connecting plate wire entry hole 111 abuts against the upper side surface of the connecting plate wire entry hole 111, and the part located in the slider wire entry hole 121 abuts against the lower side surface of the slider wire entry hole 121. A relatively large friction force can be generated at the abutting positions, so that the steel bar 5 is stably fixed to the slider 12 and the connecting plate 11. After a certain steel bar 5 is selected, external force presses on the slider 12 to squeeze and shorten the spring 13, and the slider 12 moves downward. The side wall of the steel bar 5 no longer abuts against the upper side of the connecting plate entry hole 111 or the lower side of the slider entry hole 121, and the friction force is reduced. The steel bar 5 is no longer fixed at the slider 12 and the connecting plate 11. The steel bar 5 can move back and forth under the action of traction to enter the processing station of the next process or exit from the next station.

[0030] The motor drive assembly includes a wire-inlet cylinder 21, and a wire-inlet pressure shaft 22 is installed on the output end of the wire-inlet cylinder 21. The wire-inlet pressure shaft 22 is configured to move with the expansion and contraction of the output end of the wire-inlet cylinder 21, thereby pushing the slider 12 to move in the direction of the compression spring 13, until the axis of the slider wire-inlet hole 121 and the axis of the connecting plate wire-inlet hole 111 are close to or even coincide with each other, so as to release the clamping state of the wire-releasing assembly on the steel bar 5. That is, the expansion and contraction direction of the wire-inlet cylinder 21 is parallel to the expansion and contraction direction of the spring 13, and the downward pressure of the wire-inlet pressure shaft 22 is the "external force" against the slider 12 mentioned in the previous paragraph.

[0031] The feeding assembly includes a feeding motor 31, a feeding spindle 32 is installed on the output end of the feeding motor 31, and a lower feeding wheel 33 for driving the steel bar 5 to move is sleeved on the feeding spindle 32; the feeding assembly also includes a pressing cylinder 34, a feeding pressing shaft 35 is installed on the output end of the pressing cylinder 34, and the feeding pressing shaft 35 can abut on the slide 36 and push the slide 36 to move toward the lower feeding wheel 33, and an upper feeding wheel 37 is arranged on the slide 36, and a gap is formed between the lower feeding wheel 33 and the upper feeding wheel 37 to allow the steel bar 5 to pass through. After the steel bar 5 of a suitable diameter is selected, the upper feeding wheel 37 and the lower feeding wheel 33 jointly clamp the steel bar 5, and the lower feeding wheel 33 rotates, and the steel bar 5 moves forward or backward under the drive of the lower feeding wheel 33, enters the subsequent processing position or exits from the subsequent processing position.

[0032] The automatic wire-changing mechanism of the automatic steel bar bending machine can simultaneously display multiple steel bars 5 of different diameters for selection through the coordinated work of the wire-releasing component, the motor drive component and the feeding component. When the steel bar 5 needs to be replaced, the steel bar 5 currently being processed can automatically withdraw from the processing position, and the feeding component moves to the position of the new steel bar 5. The upper feeding wheel 37 and the lower feeding wheel 33 work together to feed the new steel bar 5 to the subsequent processing position. The working effect is high, the use is convenient, the position of the steel bar 5 is accurate and reliable, and the problem of unsafe and unstable manual wire-changing is solved.

[0033] In order to realize the feeding assembly, different diameters of steel bars 5 can be selected, such as Figures 2 to 5As shown, the motor drive assembly also includes an upper pressing plate 23, a lower pressing plate 24, a screw 25, a first guide shaft 261, a second guide shaft 262, a drive motor 27 and a cylinder fixing seat 28. The upper pressing plate 23 and the lower pressing plate 24 are respectively arranged at both ends of the connecting plate 11, and the screw 25, the first guide shaft 261 and the second guide shaft 262 are respectively arranged between the upper pressing plate 23 and the lower pressing plate 24, the screw 25 and the first guide shaft 261 are located on one side of the connecting plate 11, and the second guide shaft 262 is located on the other side of the connecting plate 11. One end of the screw 25 is connected to the lower pressing plate 24, and the other end passes through the upper pressing plate 23 and is connected to the output end of the drive motor 27. The inlet cylinder 21 is installed on the cylinder fixing seat 28, and the cylinder fixing seat 28 is directly or indirectly installed on the frame. During the operation of the entire device, the cylinder fixing seat 28 and the inlet cylinder 21 do not move.

[0034] The cylinder fixing seat 28 is provided with a threaded hole for inserting the screw 25 and a light hole for inserting the first guide shaft 261, and the axis of the threaded hole is parallel to the axis of the light hole. When the screw 25 rotates, it can drive all the steel bar clamping units to move along the axis of the screw 25 through the upper pressing plate 23, the lower pressing plate 24 and the connecting plate 11, until the steel bar clamping unit with the steel bar 5 to be replaced is aligned with the inlet pressing shaft 22. Among them, the first guide shaft 261 can play a guiding role to prevent the upper pressing plate 23, the lower pressing plate 24 and the connecting plate 11 from rotating with the rotation of the screw 25; the extension direction of the screw 25 is consistent with the arrangement direction of all the steel bar clamping units, ensuring that all the steel bar clamping units can move smoothly along the screw 25.

[0035] like Figure 6 As shown, the feeding assembly also includes a support plate 38 arranged on the frame, and the cylinder fixing seat 28, the feeding motor 31, the lower feeding wheel 33, the pressing cylinder 34, the feeding pressure shaft 35, the slide 36 and the upper feeding wheel 37 are directly or indirectly mounted on the support plate 38. A strip-shaped slideway opening 381 is opened on the support plate 38, and the extension direction of the slideway opening 381 is consistent with the moving direction of the feeding pressure shaft 35. The feeding pressure shaft 35 can extend into the slideway opening 381 and push the slide 36 to move toward the lower feeding wheel 33.

[0036] The slide 36 includes an L-shaped slide body 363 and a slide stopper 364 located in the slideway opening 381. One end of the slide stopper 364 is connected to the end of the slide body 363, and the other end is connected to the slide plate 361. The ends of the slide body 363 and the slide plate 361 are respectively attached to the two sides of the support plate 38. The slide body 363 is provided with an upper feed wheel shaft 365, and the upper feed wheel 37 is sleeved on the upper feed wheel shaft 365. Preferably, the upper feed wheel shaft 365 is located between the slide body 363 and the support plate 38. When it is necessary to replace steel bars 5 of different diameters, the screw 25 rotates, and the screw 25 can drive all the steel bar clamping units to move along the axis of the screw 25 through the upper plate 23, the lower plate 24 and the connecting plate 11 until the steel bar clamping unit fixed with the steel bar 5 to be replaced is aligned with the feed pressure shaft 22. The pressing cylinder 34 presses the upper feeding wheel 37 against the side wall of the steel bar 5 through the feeding pressing shaft 35 and the slide 36, thereby pressing the steel bar 5 against the lower feeding wheel 33. The lower feeding wheel 33 rotates and the steel bar 5 is pushed forward.

[0037] The specific installation method of the feeding motor 31 and other structures is not limited. Preferably, a through hole is opened on the support plate 38, the feeding motor 31 is installed on one side of the support plate 38, the feeding spindle 32 connected to the output end of the feeding motor 31 passes through the through hole, and the lower feeding wheel 33 is sleeved on the feeding spindle 32 on the other side of the support plate 38. In addition, a cylinder bottom plate 341, a shock absorbing block and a fixing plate can also be provided on the support plate 38, the pressing cylinder 34 is installed on the fixing plate, and the shock absorbing block is arranged between the cylinder bottom plate and the fixing plate, so that the shock absorbing effect is better when the pressing cylinder 34 is working, ensuring that the whole machine is more stable and has low noise.

[0038] On the basis of the above structure, the slide 36 is slidably mounted on one side of the support plate 38, and a slide pressing plate 361 is slidably mounted on the other side of the support plate 38. The slide pressing plate 361 is connected to the slide 36, and a slide lifting bolt 362 is arranged on the slide pressing plate 361. A fixing bolt 342 is arranged on the cylinder bottom plate 341, and a tension spring 39 is arranged between the slide lifting bolt 362 and the fixing bolt 342, and the extension direction of the tension spring 39 is parallel to the extension direction of the pressing cylinder 34. When the pressing cylinder 34 is extended, the feeding pressure shaft 35 pushes the slide 36 downward, the distance between the slide lifting bolt 362 and the fixing bolt 342 increases, and the tension spring 39 is greatly stretched; when the pressing cylinder 34 is retracted, the feeding pressure shaft 35 leaves the slide 36, the tension spring 39 contracts, and the slide lifting bolt 362 approaches the fixing bolt 342 under the tension of the tension spring 39, and the slide 36 moves upward synchronously with the slide lifting bolt 362.

[0039] The specific installation method between the support plate 38 and the cylinder fixing seat 28 is not limited, as long as the support plate 38 can stably support the cylinder fixing seat 28. Preferably, a first fixing connecting plate is provided on the cylinder fixing seat 28, and a fixing seat for installing the second fixing connecting plate is provided on the second guide shaft 262. Positioning grooves are provided in the first fixing connecting plate and the second fixing connecting plate, respectively. The support plate 38 is stuck in the positioning grooves and fixed to the first fixing connecting plate and the second fixing connecting plate by bolts. It should be pointed out that a gap is left between the first fixing connecting plate and the second fixing connecting plate for the steel bar 5 to pass through.

[0040] The "rebar 5 passing through" mentioned here does not mean that the rebar 5 needs to pass through the first fixed connecting plate and the second fixed connecting plate when it moves along its axial direction, but means that when different rebars 5 are replaced, all the rebar clamping units move along the screw 25 until the rebar clamping unit where the new rebar 5 is located is aligned with the inlet pressure shaft 22. In this process, at least one rebar 5 will pass through the cylinder fixing seat 28 along the radial direction of the rebar 5. Therefore, all structures that can block the rebar 5 need to have a gap to allow the rebar 5 to pass through. Therefore, in addition to leaving a gap between the first fixed connecting plate and the second fixed connecting plate, a long opening 382 for the rebar 5 to pass horizontally should also be opened on the support plate 38. The bottom of the long opening 382 is tangent to the lower feeding wheel 33, and the top is tangent to the upper feeding wheel 37 when the pressing cylinder 34 is retracted. The width of the long opening 382 is greater than the diameter of the thickest steel bar 5 required for processing; the bottom end of the long opening 382 can be located a certain distance outside the axis connecting the lower feed wheel 33 and the upper feed wheel 37. When replacing the steel bar 5, the distance that the original steel bar 5 is withdrawn is determined according to the position of the bottom end of the long opening 382, ​​ensuring that the end of the original steel bar 5 will not be blocked by the bottom of the long opening 382.

[0041] The specific structure of the connecting plate 11 is not limited, as long as the installation and normal operation of the steel bar clamping unit can be achieved. Preferably, a plurality of grooves are provided on the connecting plate 11. The connecting plate 11 has the direction of the incoming material toward the steel bar 5 as the front end, and the groove is a structure with an open front end face and closed other faces (upper end face, lower end face, left and right side faces and rear end face), and the slider 12 can be installed in the groove. The connecting plate wire entry hole 111 is provided on the rear end face of the groove, and the plurality of connecting plate wire entry holes 111 can be different according to the diameter of the steel bar 5. An upper through hole is provided on the upper end face of the groove, and a lower through hole is provided on the lower end face, and the upper through hole, the lower through hole and the groove are collectively referred to as loose cartoon holes 112. The spring 13 is installed in the lower through hole, and the wire entry pressure shaft 22 can extend into the upper through hole to push the slider 12 to move downward.

[0042] On the basis of the above structure, the wire-laying assembly also includes a wire-in plate 14, which is connected to the connecting plate 11; an outer plate wire-in hole 141 is opened on the wire-in plate 14 along the wire-in direction of the steel bar 5, and the outer plate wire-in hole 141 and the connecting plate wire-in hole 111 correspond one to one, and the outer plate wire-in hole 141 and the connecting plate wire-in hole 111 are respectively arranged at both ends of the slider wire-in hole 121.

[0043] When there is no external force pressing the slider 12, the spring 13 pushes the slider 12 to move upward, and the part of the steel bar 5 located in the connecting plate wire entry hole 111 abuts against the upper side of the connecting plate wire entry hole 111, the part located in the slider wire entry hole 121 abuts against the lower side of the slider wire entry hole 121, and the part located in the outer plate wire entry hole 141 abuts against the upper side of the outer plate wire entry hole 141. A relatively large friction force can be generated at the abutting positions, so that the steel bar 5 is stably fixed to the slider 12 and the connecting plate 11. When there is an external force pressing the slider 12, the spring 13 is squeezed and shortened, and the slider 12 moves downward, and the side wall of the steel bar 5 no longer abuts against the upper side of the connecting plate wire entry hole 111 and the upper side of the outer plate wire entry hole 141, and the friction force is greatly reduced. The steel bar 5 is no longer fixed to the wire entry plate 14, the slider 12 and the connecting plate 11, and the steel bar 5 can move forward and backward under the action of the traction force.

[0044] The upper pressing plate 23 and the lower pressing plate 24 are respectively provided with a plurality of connection holes, which are all in a stepped shape. The ends of the first guide shaft 261 and the second guide shaft 262 are also in a stepped shape. The ends of the first guide shaft 261 and the second guide shaft 262 are respectively inserted into the connection holes and the heads protrude outward from the upper pressing plate 23 and the lower pressing plate 24. The protruding ends of the first guide shaft 261 and the second guide shaft 262 are respectively provided with guide shaft glands, which fix the guide shafts on the pressing plates. Nuts are then used on the outer sides of the guide shaft glands to be respectively locked on the ends of the first guide shaft 261 and the second guide shaft 262, thereby completing the installation of the first guide shaft 261 and the second guide shaft 262.

[0045] The end of the screw 25 away from the drive motor 27 is mounted on the lower pressing plate 24, and the connection structure between the screw 25 and the lower pressing plate 24 only restricts the screw 25 from moving along its axis but cannot restrict the screw 25 from rotating around its axis. Specifically, the connection structure can be that the end of the screw 25 is a normal flat head structure, the connection hole is stepped, the end of the screw 25 is stuck in the stepped structure and can still rotate around its axis; or the end of the screw 25 is stepped, the connection hole is a normal through hole or a stepped hole, the end of the screw 25 can also be stuck in the stepped structure and can still rotate around its axis.

[0046] Normal feeding working process: such as Figures 1 to 6As shown, the end of the steel bar 5 passes through the outer plate wire entry hole 141, the slider wire entry hole 121 and the connecting plate wire entry hole 111 in sequence, the screw 25 rotates, and all the steel bar clamping units arranged on the connecting plate 11 move along the screw 25 until the specified steel bar 5 reaches the position of the wire entry pressure shaft 22. At this time, the end of the steel bar 5 is located between the lower feeding wheel 33 and the upper feeding wheel 37; the wire entry cylinder 21 is started, the wire entry pressure shaft 22 extends into the loose card hole 112 to push the slider 12, the spring 13 contracts, and the slider 12 moves downward until the axes of the outer plate wire entry hole 141, the slider wire entry hole 121 and the connecting plate wire entry hole 111 coincide with each other, and the steel bar 5 changes from a clamped state to a loosened state; the cylinder 34 is pressed down to press the upper feed wheel 37 against the side wall of the steel bar 5 through the feed pressure shaft 35 and the slide seat 36, and the upper feed wheel 37 presses the steel bar 5 against the lower feed wheel 33 (at this time, the steel bar 5 is slightly bent downward), and the lower feed wheel 33 rotates forward, and the steel bar 5 is pushed into the main machine for the next step of processing.

[0047] The working process of replacing steel bar 5: Figure 7 and Figure 8 As shown, the lower feeding wheel 33 rotates in the opposite direction until the original steel bar 5 exits the main machine and the lower feeding wheel 33 stops rotating; the pressing cylinder 34 is retracted, the tension spring 39 lifts the slide 36 upward, and the upper feeding wheel 37 moves synchronously with the slide 36 to move away from the lower feeding wheel 33, and the steel bar 5 returns to its original state (no longer bends downward) and separates from the lower feeding wheel 33; the inlet cylinder 21 retracts the inlet pressure shaft 22, and the slider 12 moves upward under the push of the spring 13, and the part of the steel bar 5 located in the inlet hole 111 of the connecting plate abuts against the inlet hole of the connecting plate The upper side surface of 111, the part located in the slider wire entry hole 121 abuts against the lower side surface of the slider wire entry hole 121, and the part located in the outer plate wire entry hole 141 abuts against the upper side surface of the outer plate wire entry hole 141, and the friction force is used to clamp the steel bar 5 between the slider 12 and the connecting plate 11; the screw rod 25 rotates, and the connecting plate 11 moves along the screw rod 25 with all the steel bar clamping units until the steel bar clamping unit where the new steel bar 5 is located is aligned with the wire entry pressure shaft 22, and a normal feeding work process can be performed.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An automatic wire changing mechanism for an automatic steel bar bending machine, characterized in that: It comprises a pay-off assembly for fixing the ends of steel bars (5) of different diameters, a motor drive assembly for driving the steel bars (5) to move, and a feeding assembly for conveying the steel bars (5) to a main machine; wherein: The wire-releasing assembly comprises a connecting plate (11), at least two steel bar clamping units are arranged inside or on the connecting plate (11), each of the steel bar clamping units comprises a slider (12) and a spring (13), a slider wire entry hole (121) is provided on the slider (12) along the wire entry direction of the steel bar (5); one end of the spring (13) is connected to the slider (12) and is in a compressed state, and the expansion and contraction direction of the spring (13) is perpendicular to the wire entry direction of the steel bar (5); a connecting plate wire entry hole (111) is provided on the connecting plate (11) at a position corresponding to each of the sliders (12), and when no external force is applied to press the slider (12), the spring (13) causes the axis of the connecting plate wire entry hole (111) to deviate from the axis of the slider wire entry hole (121); The motor drive assembly comprises a wire-feeding cylinder (21), an output end of which is mounted a wire-feeding pressure shaft (22), the wire-feeding pressure shaft (22) being configured to push the slider (12) to move in a direction of compressing the spring (13) until the clamping state of the wire-releasing assembly on the steel bar (5) is released; The feeding assembly comprises a feeding motor (31), a feeding spindle (32) is mounted on the output end of the feeding motor (31), and a lower feeding wheel (33) for driving the reinforcing bar (5) to move is sleeved on the feeding spindle (32); the feeding assembly also comprises a pressing cylinder (34), a feeding pressing shaft (35) is mounted on the output end of the pressing cylinder (34), the feeding pressing shaft (35) can abut against a slide seat (36) and push the slide seat (36) to move in the direction of the lower feeding wheel (33), an upper feeding wheel (37) is arranged on the slide seat (36), and a gap is formed between the lower feeding wheel (33) and the upper feeding wheel (37) to allow the reinforcing bar (5) to pass through; The wire-laying assembly also includes a wire-inlet plate (14), and the wire-inlet plate (14) is connected to the connecting plate (11); an outer plate wire-inlet hole (141) is provided on the wire-inlet plate (14) along the wire-inlet direction of the steel bar (5), and the outer plate wire-inlet hole (141) corresponds to the connecting plate wire-inlet hole (111) one by one, and the outer plate wire-inlet hole (141) and the connecting plate wire-inlet hole (111) are respectively arranged at two ends of the slider wire-inlet hole (121); When the steel bar clamping unit is arranged in the connecting plate (11), a loose cartoon hole (112) is opened on the connecting plate (11) along the extension and contraction direction of the spring (13), the slider (12) and the spring (13) are both arranged in the loose cartoon hole (112), and the wire feed pressure shaft (22) is configured to be able to extend into the loose cartoon hole (112) to push the slider (12) to move in the direction of compressing the spring (13).

2. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 1 is characterized in that: One end of the spring (13) is connected to the slider (12), and the other end abuts against a spring pressure cover (15), and the spring pressure cover (15) is mounted on the connecting plate (11).

3. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 1 is characterized in that: The feeding assembly also includes a support plate (38), the slide seat (36) is slidably installed on one side surface of the support plate (38), and a slide seat pressure plate (361) is slidably installed on the other side surface of the support plate (38), the slide seat pressure plate (361) is connected to the slide seat (36), and a slide seat lifting bolt (362) is arranged on the slide seat pressure plate (361); a cylinder bottom plate (341) is arranged on the support plate (38), and a fixing bolt (342) is arranged on the cylinder bottom plate (341), and a tension spring (39) is arranged between the slide seat lifting bolt (362) and the fixing bolt (342), and the extension direction of the tension spring (39) is parallel to the extension and contraction direction of the pressing cylinder (34).

4. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 3 is characterized in that: The support plate (38) is provided with a strip-shaped slideway opening (381), the extension direction of the slideway opening (381) is consistent with the moving direction of the feeding pressure shaft (35), and the feeding pressure shaft (35) can extend into the slideway opening (381) and push the slide seat (36) to move toward the lower feeding wheel (33); the slide seat (36) includes an L-shaped slide seat body (363) and a slide seat limiter located in the slideway opening (381). Part (364), one end of the slide limiting part (364) is connected to the end of the slide body (363), and the other end is connected to the slide pressure plate (361), the end of the slide body (363) and the slide pressure plate (361) are respectively attached to the two sides of the support plate (38); an upper feed wheel shaft (365) is provided on the slide body (363), and the upper feed wheel (37) is sleeved on the upper feed wheel shaft (365).

5. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 4 is characterized in that: The upper feeding wheel shaft (365) is located between the slide seat body (363) and the support plate (38).

6. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 3 is characterized in that: The support plate (38) is provided with a long opening (382) for the steel bar (5) to pass through.

7. The automatic line-changing mechanism of the automatic steel bar bending machine according to any one of claims 1 to 6, characterized in that: The motor drive assembly also includes an upper pressing plate (23) and a lower pressing plate (24) respectively arranged at both ends of the connecting plate (11); a screw rod (25), a first guide shaft (261) and a second guide shaft (262) are respectively arranged between the upper pressing plate (23) and the lower pressing plate (24); the screw rod (25) and the first guide shaft (261) are located on one side of the connecting plate (11), and the second guide shaft (262) is located on the other side of the connecting plate (11); one end of the screw rod (25) is connected to the lower pressing plate (24), and the other end passes through the upper pressing plate (23) and is connected to the output end of the driving motor (27); the extension direction of the screw rod (25) is parallel to at least two of the connecting plates (11). The arrangement directions of the steel bar clamping units are consistent; the motor drive assembly also includes a cylinder fixing seat (28), on which a threaded hole for passing the screw rod (25) and a light hole for passing the first guide shaft (261) are respectively opened; the cylinder fixing seat (28) is directly or indirectly mounted on the frame, and the inlet cylinder (21) is mounted on the cylinder fixing seat (28). When the screw rod (25) rotates, it can drive all the steel bar clamping units to move along the axis of the screw rod (25) through the upper pressure plate (23), the lower pressure plate (24) and the connecting plate (11) until the set steel bar clamping unit is aligned with the inlet pressure shaft (22).

8. The automatic wire-changing mechanism of the automatic steel bar bending machine according to claim 7 is characterized in that: The upper pressing plate (23) and the lower pressing plate (24) are respectively provided with a plurality of connecting holes for passing the screw rod (25), the first guide shaft (261) and the second guide shaft (262); the connecting holes are in a stepped shape; at least one side end of the screw rod (25), the first guide shaft (261) and the second guide shaft (262) is in a stepped shape; the stepped ends of the screw rod (25), the first guide shaft (261) and the second guide shaft (262) respectively abut against the stepped structure of the connecting holes.

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