Automatic extrusion two-way bending tool for iron core buckle strip installation and installation method

Abstract

The invention discloses an automatic extrusion bidirectional bending tool for iron core buckle strip installation and an installation method. The automatic extrusion bidirectional bending tool comprises a workbench arranged on the lower portion of the rack, an iron core positioning device arranged on the workbench, a cross beam plate arranged on the top of the rack, and a plurality of stand columns arranged between the workbench and the cross beam plate. The annular lifting table is arranged between the workbench and the cross beam plate and movably arranged on the stand column in the vertical direction, the roller mounting bases are distributed on the annular lifting table in the circumferential direction of the annular lifting table, and the extrusion rollers are arranged on the roller mounting bases and located in an inner hole of the annular lifting table. The buckling strip lower end bending device is used for bending the lower end part of the buckling strip and enabling the lower end part of the buckling strip to be attached to the lower end face of the iron core, and the buckling strip upper end bending device is used for bending the upper end part of the buckling strip and enabling the upper end part of the buckling strip to be attached to the upper end face of the iron core. According to the invention, the installation efficiency and quality of the iron core buckle strip are improved, and the manufacturing cost of the tool for installing the iron core buckle strip is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motor iron core manufacturing process equipment, and in particular to an automatic extrusion bidirectional bending tool for installing iron core buckle strips and an installation method. Background Art

[0002] The stator core is the core component of the motor, which is made of a number of core punchings. The typical manufacturing process of the stator core is: first, the silicon steel sheets are punched into core punchings, and then the core punchings are stacked, and then welded to form the stator core assembly.

[0003] There are many types of stator core iron core lamination stacking fixing structures. For example, there are fixation by welding, fixation by rivet structure, etc. There is also a special structure of stator core iron core lamination stacking fixing structure (such as Figure 4 As shown in the figure, after the core punching sheets are stacked, a number of vertical dovetail slots are formed on the outer cylinder of the core. The core buckle bars (also called stator buckle sheets) are inserted into the dovetail slots to fix the core, and the two ends of the core buckle bars are bent to form a limit fixation on the two end surfaces of the core. The core buckle bars are straight and have an arc-shaped cross section (arc-shaped). The cross-section of the core buckle bar is made into an arc shape to facilitate the insertion of the core buckle bar into the dovetail slot. However, since there is still a certain side gap between the core buckle bar and the dovetail slot after the core buckle bar is inserted into the dovetail slot, the fit between the core buckle bar and the dovetail slot is not tight. Therefore, after the core buckle bar is inserted into the dovetail slot, the operator needs to use a hammer to knock the core buckle bar to make it plastically deform, thereby achieving a tight fit between the core buckle bar and the dovetail slot; after the tight fit between the core buckle bar and the dovetail slot is formed, the two ends of the core buckle bar need to be bent with a hammer to form a 90-degree bend to limit the axial looseness of the core buckle bar.

[0004] The installation of the core buckle bar is done manually, which has the disadvantage of low production efficiency. In order to improve production efficiency, the prior art has also developed an improved installation method for the core buckle bar, specifically, one end of the core buckle bar is preformed into a right angle, and then the core buckle bar is inserted into the dovetail groove of the core, and then the core buckle bar in the dovetail groove of the core is squeezed up and down using a special extrusion tool, and then the unbent end of the core buckle bar is bent 90 degrees after extrusion. However, this method still has some shortcomings, which are reflected in: first, one end of the core buckle bar needs to be pre-bent, and the pre-bending requires a special bending tool, which is expensive and also increases the total time for the installation of the core buckle bar; second, the up and down extrusion deformation of the core buckle bar in the dovetail groove will also cause a certain deformation of the pre-bent part, thereby affecting the contact quality between the pre-bent end and the end face of the core.

[0005] Therefore, it is necessary to improve the existing core buckle strip installation technology to solve the above problems. Summary of the invention

[0006] In order to solve the above problems, the present invention proposes an automatic extrusion bidirectional bending tool and installation method for core buckle bar installation, aiming to improve the efficiency and quality of core buckle bar installation and reduce the manufacturing cost of the tool for core buckle bar installation. The specific technical solution is as follows: The tool is provided with an automatic extrusion and bidirectional bending tool for installing a core buckle strip, comprising a frame, a workbench arranged at the lower part of the frame, a core positioning device arranged on the workbench for installing and positioning the core, a crossbeam plate arranged on the top of the frame, a number of columns arranged between the workbench and the crossbeam plate, an annular lifting platform arranged between the workbench and the crossbeam plate and movable on the columns in the up and down directions, a roller mounting seat arranged on the annular lifting platform distributed along the circumference of the annular lifting platform, an extrusion roller arranged on the roller mounting seat and located at the inner hole of the annular lifting platform for extruding the buckle strip in the dovetail groove of the core; a buckle strip lower end bender for bending the lower end portion of the buckle strip and pressing it against the lower end surface of the core, and a buckle strip upper end bender for bending the upper end portion of the buckle strip and pressing it against the upper end surface of the core.

[0007] In the present invention, a number of lifting cylinders are arranged on the crossbeam plate, and the lower ends of the piston rods of the lifting cylinders are fixedly connected to the annular lifting platform.

[0008] Preferably, a linear bearing is provided on the annular lifting platform, and the annular lifting platform is moved up and down on the column through the linear bearing.

[0009] As a preferred solution of the bender for the lower end of the buckle strip in the present invention, the bender for the lower end of the buckle strip includes a lower swing arm which is arranged at the lower position of the iron core positioning device and extends upward through a hinge shaft, a tension spring arranged on the iron core positioning device for pulling the lower swing arm toward the outer side of the iron core positioning device, a limit block arranged on the iron core positioning device for limiting the outward swing angle of the lower swing arm, a positioning step arranged at the upper inner side of the lower swing arm for positioning the lower end face of the buckle strip, and a guide surface arranged at the upper outer side of the lower swing arm for bearing the pressure of the extrusion roller to push the lower swing arm to swing inwardly to achieve bending of the lower end portion of the buckle strip.

[0010] Among them, there are several lower swing arms and they are arranged at intervals along the circumference of the core positioning device. The outer side of the core positioning device is provided with several vertical grooves along the up and down directions. Each lower swing arm is movably arranged in the corresponding vertical groove and is rotatably arranged on the core positioning device through the hinge shaft.

[0011] As a further improvement of the bender at the lower end of the buckle strip, a through hole is provided on the lower swing arm at the positioning step along the up and down directions, and a proximity switch is provided in the through hole at the end face close to the positioning step for detecting whether the buckle strip is installed in place in the axial direction.

[0012] As a preferred solution of the buckle strip upper end bender in the present invention, the buckle strip upper end bender includes a servo electric cylinder fixed on the cross beam plate, a lifting seat arranged below the cross beam plate and fixedly connected to the lower end of the telescopic rod of the servo electric cylinder, an upper swing arm arranged on the lifting seat and extending downward through a hinge shaft, a tension spring arranged on the lifting seat for pulling the upper swing arm toward the outer side of the lifting seat, a limit block arranged on the lifting seat for limiting the outward swing angle of the upper swing arm, and a guide surface arranged at the outer side of the lower part of the upper swing arm for bearing the pressure of the extrusion roller to push the upper swing arm to swing inward to achieve bending of the upper end portion of the buckle strip.

[0013] The guide surfaces on the above-mentioned lower swing arm and upper swing arm serve as cam control surfaces. After being acted upon by the lateral component of the extrusion roller, the lower swing arm and the upper swing arm swing inward, thereby pushing the end of the core buckle bar to form a 90-degree bend.

[0014] In order to enhance the stability and reliability of the up and down movement of the lifting seat, a further improvement scheme is: a number of guide rods are erected upward at the upper end of the lifting seat, and a number of guide holes are correspondingly arranged on the cross beam plate, and the guide rods are arranged on the guide holes of the cross beam plate for movement in the up and down directions.

[0015] Among them, there are several upper swing arms and they are arranged at intervals along the circumference of the lifting seat. The outer side of the lifting seat is provided with several vertical grooves along the up and down directions. Each upper swing arm is movably arranged in the corresponding vertical groove and is rotatably arranged on the lifting seat through the hinge shaft.

[0016] As a further improvement of the bender at the upper end of the buckle strip, the bender at the upper end of the buckle strip is also provided with an iron core pressure shaper for axially pressurizing and shaping the iron core when the buckle strip is bent. The iron core pressure shaper is a pressure shaping sleeve arranged at the lower end of the lifting seat.

[0017] Preferably, the height position of the lower end surface of the pressure shaping sleeve is lower than the height position of the lowest end of the upper swing arm to form a height difference, and the height difference is equal to or slightly larger than the thickness of the buckle strip (specifically, it can be determined according to the thickness tolerance of the core buckle strip and the maximum thickness of the core buckle strip).

[0018] In the present invention, the core positioning device is provided with a positioning spindle for positioning the inner hole of the core, the lower end of the lifting seat is provided with a first laser ranging sensor for detecting the height position size of the upper end face of the positioning spindle, the pressure shaping sleeve is provided with a detection through hole in the up and down directions, and the upper end opening of the detection through hole is provided with a second laser ranging sensor for detecting the height position size of the upper end face of the core.

[0019] The above-mentioned first laser ranging sensor is used to control the control system to sense the height position of the lifting seat relative to the core positioning device; when the core positioning device does not have a core punching sheet installed on the core, the second laser ranging sensor is used to control the control system to sense the height position of the lower positioning plane of the core positioning device, and when the core punching sheet of the core is installed on the core positioning device, the second laser ranging sensor is used to control the control system to sense the height position of the upper end surface of the topmost core punching sheet on the core positioning device.

[0020] In the present invention, a positioning key for realizing circumferential positioning of the iron core is arranged on the side surface of the positioning core shaft.

[0021] In order to optimize and control the axial pressure shaping force on the core when the core buckle strip is installed, a pressure sensor is arranged between the lower end of the telescopic rod of the servo electric cylinder and the lifting seat.

[0022] As a further improvement of the present invention, an avoidance step is provided on the inner side of the lower part of the upper swing arm, and an ejector mounting hole is provided on the upper swing arm in the up and down directions. An ejector is provided in the ejector mounting hole, and a pressure spring for supporting the ejector is provided in the ejector mounting hole at the upper end position of the ejector, and an adjusting screw plug for pressing the upper end of the pressure spring is provided at the upper end of the ejector mounting hole through threaded cooperation, and the lower end of the ejector passes through the ejector mounting hole to be exposed to the avoidance step and is directly opposite to the buckle strip below.

[0023] Preferably, the ejector mounting hole is a stepped hole, the ejector is arranged in the lower small hole of the stepped hole for movement in the up-down direction, the push spring and the adjusting screw plug are arranged in the upper expanded hole of the stepped hole, the upper end of the ejector is provided with a limiting flange located in the upper expanded hole, and the lower end of the push spring presses against the limiting flange.

[0024] In the present invention, the upper swing arm and the lower swing arm are made of high-speed steel material with good wear resistance.

[0025] In the present invention, the lifting cylinder, the servo electric cylinder, the proximity switch, the first laser ranging sensor, the second laser ranging sensor and the pressure sensor are respectively connected to the control system.

[0026] The steps of using the automatic extrusion bidirectional bending tool to install the core buckle strip in the present invention are as follows: (1) Preparation: The operator presses the reset button of the control system, and the control system controls the lifting cylinder and servo electric cylinder to reset, so that the annular lifting platform and lifting seat rise to the highest position to make room for the installation of the buckle strip; the operator inputs the height parameters of the iron core into the control system; (2) Core installation: Place the core punching sheets on the positioning mandrel of the core positioning device. During the placement of the core punching sheets, the control system detects the total height of the core in real time through the second laser ranging sensor and displays it on the display in real time. All the core punching sheets are placed in place until the core of the predetermined height is formed. (3) Installation of buckle strip: The operator inserts the buckle strip into the dovetail groove of the core; (4) Buckle bar extrusion: The operator presses the extrusion bending operation key of the control system, and the control system drives the annular lifting platform to move downward through the lifting cylinder. When the annular lifting platform moves downward, the extrusion roller on it squeezes the buckle bar in the dovetail groove of the iron core. The buckle bar and the dovetail groove are closely contacted by the extrusion deformation, thereby fixing the buckle bar in the dovetail groove; (5) Bending the two ends of the buckle strip: the annular lifting platform continues to move downward, so that the extrusion roller contacts the guide surface on the outer side of the lower swing arm. When the extrusion roller moves downward, it pushes the lower swing arm to swing inward through the guide surface on the outer side of the lower swing arm, thereby bending the lower end of the buckle strip into a right angle and abutting against the lower end surface of the iron core; then, the control system drives the annular lifting platform to move upward through the lifting cylinder. At the same time, the control system also drives the lifting seat to move downward through the servo electric cylinder until the pressure shaping sleeve at the lower end of the lifting seat presses the upper end surface of the iron core. The control system controls the pressure applied to the iron core to a set value through the pressure sensor; then, the extrusion roller moving upward pushes the upper swing arm to swing inward through the guide surface on the outer side of the upper swing arm, thereby bending the upper end of the buckle strip into a right angle and abutting against the upper end surface of the iron core.

[0027] Preferably, before the (4) buckle strip is squeezed, the control system determines whether the buckle strip is installed in place through the proximity switch provided on the lower swing arm. When the lower end of the buckle strip is not in contact with the end face of the positioning step of the lower swing arm, the control system also drives the lifting cylinder and the servo electric cylinder to move, so that the annular lifting platform and the lifting seat each move down a certain distance (at this time, the squeezing roller on the annular lifting platform is just located near the upper end of the buckle strip but not in contact with the buckle strip), so that the ejector pin on the upper swing arm contacts the upper end of the buckle strip, and presses the buckle strip down until its lower end contacts the end face of the positioning step of the lower swing arm. After the buckle strip is in place, the control system drives the lifting cylinder and the servo electric cylinder to move, so that the annular lifting platform and the lifting seat rise and reset to their original positions.

[0028] If the ejector pin fails to press the buckle strip into place, the control system will send out an alarm message to remind the relevant operators to handle it.

[0029] Preferably, during the bending process of the two ends of the buckle strip in step (5), the control system performs shaping and pressurizing on the iron core for a preset holding time, so that the upper and lower adjacent iron core punching sheets are in full contact with each other; and during the period of shaping and pressurizing, the control system drives the annular lifting platform to move up and down reciprocatingly several times through the lifting cylinder, so as to drive the extrusion roller to reciprocate up and down to extrude the buckle strip in the dovetail groove of the iron core, thereby achieving a fixed position between the buckle strip and the dovetail groove of the iron core, so as to further improve the quality of the installation and positioning of the buckle strip.

[0030] The beneficial effects of the present invention are: First, an automatic extrusion bidirectional bending tool and installation method for installing a core buckle bar of the present invention, by providing a buckle bar lower end bender for bending the lower end portion of the buckle bar and placing it against the lower end surface of the core, and a buckle bar upper end bender for bending the upper end portion of the buckle bar and placing it against the upper end surface of the core, achieves extrusion deformation positioning of the core buckle bar in the dovetail groove of the core and bidirectional bending of the core buckle bar at both ends, thereby overcoming the drawback of the prior art that the core buckle bar installation requires pre-bending one end of the core buckle bar, thereby improving the efficiency and quality of the core buckle bar installation and reducing the manufacturing cost of the tooling for the core buckle bar installation.

[0031] Secondly, the present invention provides an automatic extrusion bidirectional bending tool and installation method for installing an iron core buckle strip. By providing a lower swing arm with a guide surface on the bender at the lower end of the buckle strip, and providing an upper swing arm with a guide surface on the bender at the upper end of the buckle strip, the extrusion roller can realize the buckle strip extrusion while bending the two ends of the buckle strip, thereby eliminating the need to apply a separate driving force to the bending of the two ends of the buckle strip, thereby greatly simplifying the structure of the automatic extrusion bidirectional bending tool.

[0032] Third, the present invention provides an automatic extrusion bidirectional bending tool and installation method for installing a core buckle strip. A core pressure shaper is provided on the bender at the upper end of the buckle strip for axially pressurizing and shaping the core when the buckle strip is bent. The tightness of contact between adjacent core punching sheets can be ensured, thereby improving the quality of the core after the core buckle strip is installed.

[0033] Fourth, the automatic extrusion bidirectional bending tool and installation method for installing iron core buckle strips of the present invention include a buckle strip placement online monitor on the buckle strip lower end bender, and a buckle strip placement correction and remedy device on the buckle strip lower end bender; the buckle strip placement online monitor includes a proximity switch provided at the end surface of the positioning step of the lower swing arm, which can timely detect whether the operator is not in place when placing the buckle strip; the buckle strip placement correction and remedy device is to drive the lifting seat downward through the servo electric cylinder when the buckle strip is not in place, so that the top pin on the upper swing arm performs elastic top pressure correction on the buckle strip to ensure that the buckle strip is placed in place. This further improves the adaptability and reliability of the automatic extrusion bidirectional bending tool.

[0034] Fifth, the present invention is an automatic extrusion bidirectional bending tooling and installation method for installing core buckle strips. The lifting seat is provided with a first laser ranging sensor and a second laser ranging sensor, which can monitor online whether the number of core punchings placed by the operator (corresponding to the height of the core) is in place, thereby effectively avoiding the operator's mistakes of placing too many or too few core punchings, and further improving the adaptability and reliability of the automatic extrusion bidirectional bending tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an automatic extrusion bidirectional bending tool for installing an iron core buckle strip of the present invention; Figure 2 yes Figure 1 A partial enlarged view of the lower end bender of the buckle strip and the upper end bender of the buckle strip; Figure 3 yes Figure 2 A partial enlarged view of Figure 4 This is a schematic diagram of an iron core with buckle strips installed.

[0036] In the figure: 1, frame, 2, workbench, 3, iron core positioning device, 4, cross beam plate, 5, column, 6, annular lifting platform, 7, roller mounting seat, 8, iron core, 9, buckle bar, 10, extrusion roller, 11, buckle bar lower end bender, 12, buckle bar upper end bender, 13, lifting cylinder, 14, linear bearing, 15, hinge shaft, 16, lower swing arm, 17, tension spring, 18, limit stopper, 19, positioning step, 20, guide surface, 21, vertical trough, 22, through hole, 23 , proximity switch, 24, servo electric cylinder, 25, lifting seat, 26, pressure sensor, 27, upper swing arm, 28, guide rod, 29, pressure shaping sleeve, 30, positioning mandrel, 31, first laser ranging sensor, 32, detection through hole, 33, second laser ranging sensor, 34, avoidance step, 35, ejector pin mounting hole, 36, ejector pin, 37, ejector spring, 38, adjusting screw plug, 39, limit flange, 40, core punching sheet, 41, dovetail groove, 42, buckle strip bending part. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Embodiment 1:

[0038] like Figures 1 to 4 The figure shows an embodiment of an automatic extrusion bidirectional bending tool for installing a core buckle strip of the present invention, comprising a frame 1, a workbench 2 arranged at the lower part of the frame 1, a core positioning device 3 arranged on the workbench 2 for installing and positioning the core 8, a crossbeam plate 4 arranged on the top of the frame 1, a plurality of columns 5 arranged between the workbench 2 and the crossbeam plate 4, and a ring-shaped lifting platform arranged between the workbench 2 and the crossbeam plate 4 and movable in the up and down directions on the columns 5 6. A roller mounting seat 7 is arranged on the annular lifting platform 6 and is distributed along the circumference of the annular lifting platform 6; an extrusion roller 10 is arranged on the roller mounting seat 7 and is located at the inner hole of the annular lifting platform 6 and is used to extrude the buckle strip 9 in the dovetail groove 41 of the iron core 8; a buckle strip lower end bender 11 is also provided for bending the lower end portion of the buckle strip 9 and abutting it on the lower end surface of the iron core 8, and a buckle strip upper end bender 12 is provided for bending the upper end portion of the buckle strip 9 and abutting it on the upper end surface of the iron core 8.

[0039] In this embodiment, a number of lifting cylinders 13 are provided on the cross beam plate 4 , and the lower ends of the piston rods of the lifting cylinders 13 are fixedly connected to the annular lifting platform 6 .

[0040] Preferably, a linear bearing 14 is provided on the annular lifting platform 6 , and the annular lifting platform 6 is moved up and down on the column 15 through the linear bearing 14 .

[0041] As a preferred solution of the buckle strip lower end bender 11 in the present embodiment, the buckle strip lower end bender 11 includes a lower swing arm 16 which is rotatably arranged at the lower position of the core positioning device 3 and extends upward through a hinge shaft 15, a tension spring 17 arranged on the core positioning device 3 for pulling the lower swing arm 16 toward the outer side of the core positioning device 3, a limit block 18 arranged on the core positioning device 3 for limiting the outward swing angle of the lower swing arm 16, a positioning step 19 arranged at the upper inner position of the lower swing arm 16 for positioning the lower end surface of the buckle strip 9, and a guide surface 20 arranged at the upper outer position of the lower swing arm 16 for bearing the pressure of the extrusion roller 10 to push the lower swing arm 16 to swing inwardly so as to realize the bending of the lower end portion of the buckle strip 9.

[0042] Among them, there are several lower swing arms 16 and they are arranged at intervals along the circumference of the core positioning device 3. The outer side of the core positioning device 3 is provided with several vertical slots 21 along the up and down directions. Each lower swing arm 16 is movably arranged in the corresponding vertical slot 21 and is rotatably arranged on the core positioning device 3 through the hinge shaft 15.

[0043] As a further improvement of the bender 11 at the lower end of the buckle strip, a through hole 22 is provided on the lower swing arm 16 at the positioning step 19 along the up and down directions, and a proximity switch 23 is provided in the through hole 22 at the end surface close to the positioning step 19 for detecting whether the buckle strip 9 is installed in place in the axial direction.

[0044] As a preferred solution of the buckle strip upper end bender 12 in this embodiment, the buckle strip upper end bender 12 includes a servo electric cylinder 24 fixed on the cross beam plate 4, a lifting seat 25 arranged below the cross beam plate 4 and fixedly connected to the lower end of the telescopic rod of the servo electric cylinder 24, an upper swing arm 27 arranged on the lifting seat 25 and extending downward through a hinge shaft 15, a tension spring 17 arranged on the lifting seat 25 for pulling the upper swing arm 27 toward the outer side of the lifting seat 25, a limit block 18 arranged on the lifting seat 25 for limiting the outward swing angle of the upper swing arm 27, and a guide surface 20 arranged at the lower outer side of the upper swing arm 27 for bearing the pressure of the extrusion roller 10 to push the upper swing arm 27 to swing inwardly to achieve the bending of the upper end portion of the buckle strip 9.

[0045] The guide surfaces 20 on the lower swing arm 16 and the upper swing arm 27 serve as cam control surfaces. Under the action of the lateral component of the extrusion roller 10, the lower swing arm 16 and the upper swing arm 27 swing inward, thereby pushing the end of the core buckle bar 9 to form a 90-degree bend.

[0046] In order to enhance the stability and reliability of the up and down movement of the lifting seat 25, a further improvement scheme is: a number of guide rods 28 are erected upward at the upper end of the lifting seat 25, and a number of guide holes are correspondingly arranged on the cross beam plate 4. The guide rods 28 are arranged on the guide holes of the cross beam plate 4 for movement in the up and down directions.

[0047] There are several upper swing arms 27 which are arranged at intervals along the circumference of the lifting seat 25. The outer side of the lifting seat 25 is provided with several vertical grooves 21 along the up and down directions. Each upper swing arm 27 is movably arranged in the corresponding vertical groove 21 and is rotatably arranged on the lifting seat 25 through the hinge shaft 15.

[0048] As a further improvement of the bender at the upper end of the buckle strip, the bender 12 at the upper end of the buckle strip is also provided with a core pressure shaper for axially pressurizing and shaping the iron core 8 when the buckle strip 9 is bent. The core pressure shaper is a pressure shaping sleeve 29 arranged at the lower end of the lifting seat 25.

[0049] Preferably, the height position of the lower end surface of the pressure shaping sleeve 29 is lower than the height position of the lowest end of the upper swing arm 27 to form a height difference, and the height difference is equal to or slightly larger than the thickness dimension of the buckle strip 9 (specifically, it can be determined according to the thickness tolerance of the core buckle strip 9 and the maximum thickness of the core buckle strip 9).

[0050] In this embodiment, the core positioning device 3 is provided with a positioning spindle 30 for positioning the inner hole of the core 8, the lower end of the lifting seat 25 is provided with a first laser ranging sensor 31 for detecting the height position size of the upper end surface of the positioning spindle 30, and the pressure shaping sleeve 29 is provided with a detection through hole 32 along the up and down directions, and the upper end opening of the detection through hole 32 is provided with a second laser ranging sensor 33 for detecting the height position size of the upper end surface of the core 8.

[0051] The above-mentioned first laser ranging sensor 31 is used to control the control system to sense the height position of the lifting seat 25 relative to the core positioning device 3; when the core punching sheet 40 of the core 8 is not installed on the core positioning device 3, the second laser ranging sensor 33 is used to control the system to sense the height position of the lower positioning plane of the core positioning device 3, and when the core punching sheet 40 of the core 8 is installed on the core positioning device 3, the second laser ranging sensor 33 is used to control the system to sense the height position of the upper end surface of the topmost core punching sheet 40 on the core positioning device 3.

[0052] In this embodiment, a positioning key (not shown in the figure) for achieving circumferential positioning of the iron core is disposed on the side surface of the positioning core shaft 30 .

[0053] In order to optimize the control of the axial pressure shaping force on the core 8 when the core buckle strip 9 is installed, a pressure sensor 26 is provided between the lower end of the telescopic rod of the servo electric cylinder 24 and the lifting seat 25 .

[0054] As a further improvement of the present embodiment, an avoidance step 34 is provided on the inner side of the lower part of the upper swing arm 27, and an ejector mounting hole 35 is provided on the upper swing arm 27 in the up and down directions. An ejector 36 is provided in the ejector mounting hole 35, and a pressure spring 37 for supporting the ejector 36 is provided in the ejector mounting hole 35 at the upper end position of the ejector 36, and an adjusting screw plug 38 for pressing the upper end of the pressure spring 37 is provided at the upper end of the ejector mounting hole 35 through threaded cooperation, and the lower end of the ejector 36 passes through the ejector mounting hole 35 to be exposed to the avoidance step 34 and is directly opposite to the buckle strip 9 below.

[0055] Preferably, the ejector mounting hole 35 is a stepped hole, the ejector 36 is arranged in the lower small hole of the stepped hole for movement in the up and down directions, the push spring 37 and the adjusting screw plug 38 are arranged in the upper expanded hole of the stepped hole, the upper end of the ejector 36 is provided with a limiting flange 39 located in the upper expanded hole, and the lower end of the push spring 37 presses against the limiting flange 39.

[0056] In this embodiment, the upper swing arm 27 and the lower swing arm 16 are made of high-speed steel material with good wear resistance.

[0057] In this embodiment, the lifting cylinder 13, the servo electric cylinder 24, the proximity switch 23, the first laser ranging sensor 31, the second laser ranging sensor 33 and the pressure sensor 26 are respectively connected to the control system.

[0058] In this embodiment, the steps for installing the core buckle strip using the automatic extrusion bidirectional bending tool are as follows: (1) Preparation: The operator presses the reset button of the control system, and the control system controls the lifting cylinder 13 and the servo electric cylinder 24 to reset, so that the annular lifting platform 6 and the lifting seat 25 rise to the highest position to make room for the installation of the buckle strip 9; the operator inputs the height parameter of the iron core 8 into the control system; (2) Core installation: The core punching sheets 40 are placed on the positioning mandrel 30 of the core positioning device 3. During the placement of the core punching sheets 40, the control system detects the total height of the core 8 in real time through the second laser ranging sensor 33 and displays it in real time on the display until all the core punching sheets 40 are placed in place until the core 8 of the predetermined height is formed. (3) Installation of buckle strip: The operator inserts the buckle strip 9 into the dovetail groove 41 of the iron core 8; (4) Extrusion of buckle strips: The operator presses the extrusion and bending operation key of the control system, and the control system drives the annular lifting platform 6 to move downward through the lifting cylinder 13. When the annular lifting platform 6 moves downward, the extrusion roller 10 on it squeezes the buckle strip 9 in the dovetail groove 41 of the iron core 8. The buckle strip 9 is closely contacted with the dovetail groove 41 through extrusion deformation, thereby fixing the buckle strip 9 in the dovetail groove 41; (5) Bending the two ends of the buckle strip: the annular lifting platform 6 continues to move downward, so that the extrusion roller 10 contacts the guide surface 20 on the outer side of the lower swing arm 16. When the extrusion roller 10 moves downward, it pushes the lower swing arm 16 to swing inward through the guide surface 20 on the outer side of the lower swing arm 16, thereby bending the lower end of the buckle strip 9 into a right angle and abutting against the lower end surface of the iron core 8; then, the control system drives the annular lifting platform 6 to move upward through the lifting cylinder 13. At the same time, the control system also drives the lifting seat 25 to move downward through the servo electric cylinder 24 until the pressure shaping sleeve 29 at the lower end of the lifting seat 25 presses the upper end surface of the iron core 8. The control system controls the pressure applied to the iron core 8 to a set value through the pressure sensor 26; then, the extrusion roller 10 moving upward pushes the upper swing arm 27 to swing inward through the guide surface 20 on the outer side of the upper swing arm 27, thereby bending the upper end of the buckle strip 9 into a right angle and abutting against the upper end surface of the iron core 8.

[0059] Preferably, before the (4) buckle strip is squeezed, the control system determines whether the buckle strip 9 is installed in place through the proximity switch 23 provided on the lower swing arm 16. When the lower end of the buckle strip 9 is not in contact with the end face of the positioning step 19 of the lower swing arm 16, the control system also drives the lifting cylinder 13 and the servo electric cylinder 24 to move, so that the annular lifting platform 6 and the lifting seat 25 each move downward for a certain distance (at this time, the squeezing roller 10 on the annular lifting platform 6 is just located at a position close to the upper end of the buckle strip 9 but not in contact with the buckle strip 9), so that the ejector pin 36 on the upper swing arm 27 contacts the upper end of the buckle strip 9, and presses the buckle strip 9 down until its lower end contacts the end face of the positioning step 19 of the lower swing arm 16. After the buckle strip is in place, the control system drives the lifting cylinder 13 and the servo electric cylinder 24 to move, so that the annular lifting platform 6 and the lifting seat 25 rise and return to their original positions.

[0060] If the ejector pin 36 fails to press the buckle strip 9 into place, the control system will issue an alarm message to remind the relevant operators to handle it.

[0061] Preferably, during the bending process of the two ends of the buckle strip in step (5), the control system performs shaping and pressing on the iron core 8 for a predetermined holding time, so that the upper and lower adjacent iron core punching sheets 40 are in full contact with each other; and during the period of shaping and pressing, the control system drives the annular lifting platform 6 to move back and forth several times via the lifting cylinder 13, so as to drive the extrusion roller 10 to reciprocate up and down to extrude the buckle strip 9 in the dovetail groove 41 of the iron core 8, thereby achieving a reinforced positioning between the buckle strip 9 and the dovetail groove 41 of the iron core 8, so as to further improve the quality of the buckle strip installation and positioning.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic extrusion bidirectional bending tool for installing core buckle strips, characterized in that: The invention comprises a frame, a workbench arranged at the lower part of the frame, an iron core positioning device arranged on the workbench for installing and positioning the iron core, a crossbeam plate arranged on the top of the frame, a number of columns arranged between the workbench and the crossbeam plate, an annular lifting platform arranged between the workbench and the crossbeam plate and movable on the columns in the up-down direction, a roller mounting seat arranged on the annular lifting platform distributed along the circumference of the annular lifting platform, an extrusion roller arranged on the roller mounting seat and located at the inner hole of the annular lifting platform for extruding buckle strips in the dovetail groove of the iron core; a buckle strip lower end bender for bending the lower end portion of the buckle strip and abutting it against the lower end surface of the iron core, and a buckle strip upper end bender for bending the upper end portion of the buckle strip and abutting it against the upper end surface of the iron core.

2. The automatic extrusion bidirectional bending tool for installing the core buckle strip according to claim 1 is characterized in that: A number of lifting cylinders are arranged on the cross beam plate, and the lower ends of the piston rods of the lifting cylinders are fixedly connected to the annular lifting platform.

3. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 1 is characterized in that: The bender at the lower end of the buckle strip includes a lower swing arm which is arranged at the lower position of the iron core positioning device and extends upward by rotating through a hinge shaft, a tension spring arranged on the iron core positioning device for pulling the lower swing arm toward the outside of the iron core positioning device, a limit block arranged on the iron core positioning device for limiting the outward swing angle of the lower swing arm, a positioning step arranged at the upper inner position of the lower swing arm for positioning the lower end surface of the buckle strip, and a guide surface arranged at the upper outer position of the lower swing arm for bearing the pressure of the extrusion roller to push the lower swing arm to swing inward to achieve bending of the lower end portion of the buckle strip.

4. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 3 is characterized in that: There are several lower swing arms and they are arranged at intervals along the circumference of the core positioning device. The outer side of the core positioning device is provided with several vertical slots along the up and down directions. Each lower swing arm is movably arranged in the corresponding vertical slot and is rotatably arranged on the core positioning device through the hinge shaft.

5. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 3 is characterized in that: A through hole is provided on the lower swing arm at the location of the positioning step along the up-down direction, and a proximity switch for detecting whether the buckle strip is installed in place in the axial direction is provided at the end surface of the positioning step in the through hole.

6. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 1, characterized in that: The buckle strip upper end bender includes a servo electric cylinder fixed on the cross beam plate, a lifting seat arranged below the cross beam plate and fixedly connected to the lower end of the telescopic rod of the servo electric cylinder, an upper swing arm arranged on the lifting seat and extending downward through a hinge shaft, a tension spring arranged on the lifting seat for pulling the upper swing arm toward the outside of the lifting seat, a limit stopper arranged on the lifting seat for limiting the outward swing angle of the upper swing arm, and a guide surface arranged at the outer side of the lower part of the upper swing arm for bearing the pressure of the extrusion roller to push the upper swing arm to swing inward, thereby realizing the bending of the upper end part of the buckle strip.

7. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 6, characterized in that: A number of guide rods are erected upwardly on the upper end of the lifting seat, and a number of guide holes are correspondingly arranged on the cross beam plate. The guide rods are arranged on the guide holes of the cross beam plate so as to move in the up-down direction.

8. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 6, characterized in that: There are several upper swing arms and they are arranged at intervals along the circumference of the lifting seat. The outer side of the lifting seat is provided with several vertical grooves along the up and down directions. Each upper swing arm is movably arranged in the corresponding vertical groove and is rotatably arranged on the lifting seat through the hinge shaft.

9. The automatic extrusion bidirectional bending tool for installing core buckle strips according to claim 8, characterized in that: The iron core positioning device is provided with a positioning core shaft for positioning the inner hole of the iron core, the lower end of the lifting seat is provided with a first laser ranging sensor for detecting the height position size of the upper end face of the positioning core shaft, the pressure shaping sleeve is provided with a detection through hole in the up and down directions, and the upper end opening of the detection through hole is provided with a second laser ranging sensor for detecting the height position size of the upper end face of the iron core; a pressure sensor is provided between the lower end of the telescopic rod of the servo electric cylinder and the lifting seat.

10. The method for installing the automatic extrusion bidirectional bending tool for installing the core buckle strip according to any one of claims 1 to 9, characterized in that: The steps for installing the core buckle strip using the automatic extrusion bidirectional bending tool are as follows: (1) Preparation: The operator presses the reset button of the control system, and the control system controls the lifting cylinder and servo electric cylinder to reset, so that the annular lifting platform and lifting seat rise to the highest position to make room for the installation of the buckle strip; the operator inputs the height parameters of the iron core into the control system; (2) Core installation: Place the core punching sheets on the positioning mandrel of the core positioning device. During the placement of the core punching sheets, the control system detects the total height of the core in real time through the second laser ranging sensor and displays it on the display in real time. All the core punching sheets are placed in place until the core of the predetermined height is formed. (3) Installation of buckle strip: The operator inserts the buckle strip into the dovetail groove of the core; (4) Buckle bar extrusion: The operator presses the extrusion bending operation key of the control system, and the control system drives the annular lifting platform to move downward through the lifting cylinder. When the annular lifting platform moves downward, the extrusion roller on it squeezes the buckle bar in the dovetail groove of the iron core. The buckle bar and the dovetail groove are closely contacted by the extrusion deformation, thereby fixing the buckle bar in the dovetail groove; (5) Bending the two ends of the buckle strip: the annular lifting platform continues to move downward, so that the extrusion roller contacts the guide surface on the outer side of the lower swing arm. When the extrusion roller moves downward, it pushes the lower swing arm to swing inward through the guide surface on the outer side of the lower swing arm, thereby bending the lower end of the buckle strip into a right angle and abutting against the lower end surface of the iron core; then, the control system drives the annular lifting platform to move upward through the lifting cylinder. At the same time, the control system also drives the lifting seat to move downward through the servo electric cylinder until the pressure shaping sleeve at the lower end of the lifting seat presses the upper end surface of the iron core. The control system controls the pressure applied to the iron core to a set value through the pressure sensor; then, the extrusion roller moving upward pushes the upper swing arm to swing inward through the guide surface on the outer side of the upper swing arm, thereby bending the upper end of the buckle strip into a right angle and abutting against the upper end surface of the iron core.

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