Automatic welding machine and method for stator core

Abstract

The invention provides an automatic welding machine for a stator iron core, which is used for welding a certain number of stacked scattered sheets to obtain the stator iron core, and comprises a rack on which a workbench is arranged; the rotary table is rotatably arranged on the workbench along the vertical axis, four bases are arranged on the rotary table at equal angles, the bases are used for placing to-be-welded scattered sheets, and the rotary table can drive the bases to sequentially pass through a feeding station, a height measuring station, a welding station and a discharging station to sequentially complete feeding, height measuring, welding and discharging of the scattered sheets. The feeding station, the height measuring station, the welding station and the discharging station are arranged at equal angles relative to the rotating axis of the rotating disc. The feeding mechanism is arranged at a feeding station on the rack and used for feeding the scattered sheets to the base located at the feeding station; the height measuring mechanism is arranged at a height measuring station on the rack and is used for measuring the height of the scattered sheets located at the height measuring station and further judging whether the number of the scattered sheets meets the requirement or not; the welding mechanism is arranged at the welding station on the rack and used for welding the scattered sheets located at the welding station; and the discharging mechanism is arranged at the discharging station on the rack and used for discharging the welded scattered sheets located at the discharging public work position.

Description

Technical Field

[0001] The invention relates to the field of stator production, and in particular to an automatic welding machine and method for a stator core. Background Art

[0002] Some stator cores are made by stacking multiple loose sheets together. After the loose sheets are stacked together, they need to be welded together in the up and down directions. When welding, welding needs to be performed at multiple locations on the side of the loose sheets. Currently, welding is mostly done semi-automatically. On the one hand, the loose sheets need to be placed in the welding station, and on the other hand, only one position can be welded at a time, which is inefficient. Summary of the invention

[0003] The main purpose of the present invention is to provide an automatic welding machine and method for a stator core, which can realize automatic detection of the number of loose pieces and welding.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: an automatic welding machine for stator core, used for welding a certain number of stacked loose sheets to obtain a stator core, comprising:

[0005] A frame, on which a workbench is arranged;

[0006] A turntable is rotatably arranged on a workbench along a vertical axis, and four bases are arranged on the turntable at equal angles. The bases are used to place the pieces to be welded. The turntable can drive the bases to sequentially pass through a loading station, a height measuring station, a welding station, and a unloading station to sequentially complete the loading, height measurement, welding, and unloading of the pieces. The loading station, the height measuring station, the welding station, and the unloading station are arranged at equal angles relative to the rotation axis of the turntable.

[0007] A feeding mechanism, arranged at a feeding station on the frame, for feeding the loose sheets onto a base located at the feeding station;

[0008] A height measuring mechanism is provided at a height measuring station on the frame, and is used to measure the height of the scattered pieces at the height measuring station and then determine whether the number of the scattered pieces meets the requirement;

[0009] A welding mechanism, arranged at a welding station on the frame, for welding the loose pieces at the welding station;

[0010] The unloading mechanism is arranged at the unloading station on the frame and is used for unloading the loose pieces which are located at the unloading station and have been welded.

[0011] Preferably, each of the bases comprises:

[0012] A bottom plate, fixed on the turntable;

[0013] A positioning column is arranged on the bottom plate, the positioning column is arranged vertically and its cross-sectional shape is configured so that when the loose sheet is sleeved on the positioning column, no shaking occurs;

[0014] A positioning rod is arranged on the bottom plate and located on one side of the positioning column. The positioning rod extends vertically, and at least one side of the positioning rod facing the positioning column is a plane. A plane is also arranged on the edge of the loose sheet. When the loose sheet is placed on the positioning column, the plane on the loose sheet contacts the plane on the positioning rod.

[0015] Preferably, the welding mechanism comprises a plurality of welding guns, the plurality of welding guns can be synchronously moved up and down, and the plurality of welding guns can simultaneously weld a plurality of welding positions of the loose pieces located at the welding station.

[0016] Preferably, the welding mechanism further comprises:

[0017] A first mounting plate is supported on the frame by a plurality of support rods;

[0018] The lifting plate is supported on the support rod in an up-and-down manner, the lifting plate is located between the first mounting plate and the workbench, and the welding gun is arranged on the lifting plate.

[0019] Preferably, the welding mechanism further comprises a smoking duct, which is used for the welding gun to extract the smoke generated by welding during welding. The smoking duct is suspended on the first mounting plate movably up and down. When welding, the smoking duct can move up and down with the welding gun.

[0020] Preferably, the height measuring mechanism comprises:

[0021] A second mounting plate, disposed on the first mounting plate;

[0022] A lifting frame is suspended below the second mounting plate so as to be movable up and down;

[0023] Two third mounting plates are respectively arranged on two opposite sides of the lifting frame and can move up and down relative to the lifting frame;

[0024] Two lower end detection rods are respectively arranged at the lower end of the third mounting plate and extend downward;

[0025] Two fourth mounting plates are respectively arranged on the two third mounting plates and can move up and down relative to the third mounting plates;

[0026] Two upper detection rods are arranged at the lower end of the fourth mounting plate and extend downward;

[0027] The distance measuring sensor is fixed on the third mounting plate and its detection end is connected to the fourth mounting plate, and is used to detect the relative movement distance between the lower end detection rod and the upper end detection rod, and calculate the number of loose pieces through the distance.

[0028] Preferably, two first guide rods are arranged between the third mounting plate and the lifting frame, the upper ends of the first guide rods are fixed on the lifting frame, the third mounting plate can slide within a certain range relative to the first guide rods, and a first spring is arranged on at least one of the first guide rods, the first spring is always in a compressed state, so that the lower end detection rod always has a tendency to move downward relative to the lifting frame; and / or,

[0029] Two second guide rods are arranged on the third mounting plate, and the second guide rods extend downward. The fourth mounting plate is slidably arranged on the second guide rods. The fourth mounting plate can move within a certain range in the up and down directions relative to the third mounting plate. A second spring is arranged on the second guide rod, and the second spring is always in a compressed state.

[0030] Preferably, the height measurement mechanism further comprises:

[0031] A lower pressure plate, which can move up and down, and guide blocks are respectively arranged on the other two opposite sides of the lifting frame, and a third guide rod is arranged on each guide block and slides in the up and down directions, and the lower end of the third guide rod is connected to the lower pressure plate, and a third spring is arranged on the part of the third guide rod located between the lower pressure plate and the guide block, one end of the third spring rests on the lower pressure plate, and the other end rests on the corresponding guide block; the third spring is in a compressed state at least when the lower end detection rod touches the bottom plate.

[0032] The present invention also provides an automatic welding method for a stator core, using the above welding machine, specifically comprising the following steps:

[0033] Step 1: Place the pre-arranged loose pieces on the base located at the loading station;

[0034] Step 2: Driven by the turntable, the scattered pieces move to the height measuring station, and the height of the scattered pieces is detected by the height measuring mechanism, and based on the obtained height, it is determined whether the number of scattered pieces is consistent with the required number;

[0035] Step 3: If the number of loose pieces is consistent with the required number, the turntable drives the loose pieces to move to the welding station;

[0036] Step 4: Multiple welding guns of the welding mechanism move downward to weld different positions from top to bottom;

[0037] Step 5: The turntable moves the welded pieces to the unloading station for unloading.

[0038] Preferably, the step 2 of measuring the height of the scattered pieces specifically adopts the following steps:

[0039] Step 21, the lifting frame moves downward, and at the same time, the lower end detection rod and the upper end detection rod move downward together;

[0040] Step 22, when the lifting frame moves downward to the first position, the lower end of the upper detection rod abuts against the uppermost loose piece;

[0041] Step 23, the lifting frame continues to move downward, and when it moves to the second position, the lower pressing plate contacts the uppermost loose piece;

[0042] Step 24, the lifting frame continues to move downward, and when it moves to the third position, the lower end of the lower detection rod abuts against the bottom plate;

[0043] Step 25, obtaining the data change of the ranging sensor in executing steps 21 to 24 to obtain the height of the scattered pieces.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention can realize automatic quantity detection and automatic welding of loose pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a stereogram of the present invention;

[0047] Figure 2 It is the structural diagram of the turntable and the rack;

[0048] Figure 3 It is an enlarged view of point A;

[0049] Figure 4 It is the structural diagram of the welding mechanism;

[0050] Figure 5-7 It is a structural diagram of the height measuring mechanism. DETAILED DESCRIPTION

[0051] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0052] An automatic welding machine for stator cores includes a frame 1, on which a workbench 101 is arranged. The automatic welding machine also includes a turntable 2 rotatably arranged on the workbench 101, and the rotation axis of the turntable 2 is arranged vertically. Four bases 201 are arranged at equal angles on the turntable 2, and the bases 201 are used to place the stator core 100 before and after welding. Driven by the turntable 2, the bases 201 can pass through a loading station, a height measuring station, a welding station, and a unloading station in sequence, and the loading station, the height measuring station, the welding station, and the unloading station are arranged at equal angles relative to the rotation axis of the turntable 2.

[0053] The base 201 includes a bottom plate 203 fixed on the turntable 2 and a positioning column 204 arranged on the bottom plate 203. The positioning column 204 is arranged vertically and its cross-sectional shape is configured so that when the loose sheet is sleeved on the positioning column 204, it will not shake. The base 201 also includes a positioning rod 202 arranged on the bottom plate 203 and located on one side of the positioning column 204. The positioning rod 202 extends vertically, and at least one side of the positioning rod 202 facing the positioning column 204 is a plane. A plane is also arranged on the edge of the loose sheet. When the loose sheet is placed on the positioning column 204, the plane on the loose sheet contacts the plane on the positioning rod 202, and the positioning rod 202 can prevent the loose sheet or the stator core 100 from rotating by itself.

[0054] The automatic welding machine also includes a height measuring mechanism 7 arranged at a height measuring station, and the height measuring mechanism 7 includes a second mounting plate 701, a lifting frame 702 suspended below the second mounting plate 701 and movable up and down, a third mounting plate 707 is respectively arranged on two opposite sides of the lifting frame 702, a lower end detection rod 705 is arranged at the lower end of the third mounting plate 707 and extends downward, two fourth mounting plates 708 are respectively arranged on the two third mounting plates 707, and an upper end detection rod 706 is arranged at the lower end of the fourth mounting plate 708 and extends downward.

[0055] The third mounting plate 707 can move up and down relative to the lifting frame 702. Specifically, the third mounting plate 707 is connected to the lifting frame 702 by means of a slider and a slide rail, and two first guide rods 712 are arranged between the third mounting plate 707 and the lifting frame 702. The upper ends of the first guide rods 712 are fixed on the lifting frame 702. The third mounting plate 707 can slide within a certain range relative to the first guide rods 712, and a first spring 713 is arranged on at least one of the first guide rods 708. The first spring 713 is always in a compressed state, so that the lower end detection rod 706 always has a tendency to move downward relative to the lifting frame 702, so as to ensure that the lower end detection rod 705 can always rest against the bottom plate 203 after touching the bottom plate 203 and will not shake. At the same time, the first spring 713 also has a certain buffering effect.

[0056] The fourth mounting plate 708 can move up and down relative to the third mounting plate 707. Specifically, the fourth mounting plate 708 is connected to the third mounting plate 707 by means of a slider and a slide rail, and two second guide rods 710 are provided on the third mounting plate 707, and the second guide rods 710 extend downward. The fourth mounting plate 708 is slidably provided on the second guide rods 710, and the fourth mounting plate 708 can move within a certain range in the up and down directions relative to the third mounting plate 707. A second spring 714 is provided on the second guide rod 710, and the second spring 714 is always in a compressed state to ensure that the upper end detection rod 706 can always rest on the uppermost loose piece after resting on the uppermost loose piece and will not shake, and the second spring 714 also has a certain buffering effect.

[0057] The height measuring mechanism 7 further includes a distance measuring sensor 709, which is fixed on the third mounting plate 707 and its detection end is connected to the fourth mounting plate 708. During detection, the lifting frame 702 moves downward, driving the upper detection rod 706 and the lower detection rod 705 to move downward, and the lower end of the upper detection rod 706 will first touch the uppermost loose piece. At this time, the upper detection rod 706 will no longer move downward, and the lower detection rod 705 will continue to move downward under the drive of the lifting frame 702 until the lower end of the lower detection rod 705 touches the bottom plate 203, and the lifting frame 702 will no longer move. The relative movement distance of the upper detection rod 706 and the lower detection rod 705 is the total thickness of all loose pieces. Since the thickness of each loose piece is fixed, the number of loose pieces can be calculated by the total thickness, and finally it is determined whether the number of loose pieces is the predetermined number. If it is the predetermined number, it will enter the next station for welding; if it is not the predetermined number, there can be manual intervention to supplement or reduce the loose pieces, or it can be driven by the turntable 2 and not take any action when passing through the welding station and the unloading station until it returns to the loading station to supplement or reduce the material, and then re-enter the height measurement station for re-detection. The distance sensor 709 adopts the existing technology. In order to ensure that the upper detection rod 706 touches the loose piece first every time, the distance between the lower end of the lower detection rod 705 and the lower end of the upper detection rod 706 in the vertical direction is adjusted to be less than the thickness of the stator core 100 to be produced.

[0058] The height measuring mechanism 7 further includes a lower pressing plate 704, which can move up and down and is used to press against the uppermost loose sheet when the lifting frame 702 descends to a certain height. Further, guide blocks 703 are respectively arranged on the other two opposite sides of the lifting frame 702, and a third guide rod 7031 is slidably arranged on each guide block 703 in the up and down direction, the lower end of the third guide rod 7031 is connected to the lower pressing plate 704, and a third spring 711 is arranged on the part of the third guide rod 7031 located between the lower pressing plate 704 and the guide block 703, one end of the third spring 711 is against the lower pressing plate 704, and the other end is against the corresponding guide block 703. The third spring 711 is in a compressed state at least when the lower end detection rod 705 touches the bottom plate 203, so that when in the detection position, the lower pressing plate 704 can generate a certain pressure on the loose sheet, compress the loose sheet, and make the detection more accurate.

[0059] The automatic welding machine also includes a welding mechanism arranged at a welding station of the frame 1. The welding mechanism includes a plurality of welding guns 5, which can move up and down synchronously, thereby welding the loose pieces from the upper and lower directions. Each welding gun 5 corresponds to a welding position. The welding gun 5 adopts the existing technology.

[0060] Furthermore, the welding mechanism further includes a first mounting plate 3 supported on the frame 1 by a plurality of support rods 41, and a lifting plate 4 supported on the support rods 41 in a manner that can move up and down, the lifting plate 4 is located between the first mounting plate 3 and the workbench 101, and the welding gun 5 is arranged on the lifting plate 4. Since the scattered pieces are stacked and have a certain height, it is necessary to move from one end to the other end to weld all the scattered pieces together during welding. Therefore, during welding, it is necessary to move from top to bottom or from bottom to top while welding. The movement of the lifting plate 4 is driven by a screw rod and a motor.

[0061] The second mounting plate 701 is disposed on the first mounting plate 3 .

[0062] Furthermore, the welding mechanism further includes a smoking pipe 6, which is used for the welding gun 5 to extract the smoke generated by welding. The smoking pipe 6 is suspended on the first mounting plate 3 and can be moved up and down. When welding, the smoking pipe 6 can move up and down with the welding gun 5, and keep a small distance from the welding gun 5 as much as possible to ensure the smoking effect. The smoking pipe 6 is driven by a linear module installed on the first mounting plate 3.

[0063] After the scattered pieces are welded, the obtained stator core 100 is moved to the unloading station driven by the turntable 2, where an unloading mechanism is provided. The unloading mechanism may be a clamping claw, etc., which will not be described in detail here.

[0064] The feeding mechanism also adopts the prior art, for example, it can be a clamping claw, or even can be manually. Before feeding, the scattered pieces have been sorted according to a predetermined number and aligned up and down.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic welding machine for stator core, used for welding a certain number of stacked loose sheets to obtain a stator core, characterized in that: include: A frame, on which a workbench is arranged; A turntable is rotatably arranged on a workbench along a vertical axis, and four bases are arranged on the turntable at equal angles. The bases are used to place the pieces to be welded. The turntable can drive the bases to sequentially pass through a loading station, a height measuring station, a welding station, and a unloading station to sequentially complete the loading, height measurement, welding, and unloading of the pieces. The loading station, the height measuring station, the welding station, and the unloading station are arranged at equal angles relative to the rotation axis of the turntable. A feeding mechanism, arranged at a feeding station on the frame, for feeding the loose sheets onto a base located at the feeding station; A height measuring mechanism is provided at a height measuring station on the frame, and is used to measure the height of the scattered pieces at the height measuring station and then determine whether the number of the scattered pieces meets the requirement; A welding mechanism, arranged at a welding station on the frame, for welding the loose pieces at the welding station; The unloading mechanism is arranged at the unloading station on the frame and is used for unloading the loose pieces which are located at the unloading station and have been welded.

2. The automatic welding machine for stator core according to claim 1, characterized in that: Each of the bases comprises: A bottom plate, fixed on the turntable; A positioning column is arranged on the bottom plate, the positioning column is arranged vertically and its cross-sectional shape is configured so that when the loose sheet is sleeved on the positioning column, no shaking occurs; A positioning rod is arranged on the bottom plate and located on one side of the positioning column. The positioning rod extends vertically, and at least one side of the positioning rod facing the positioning column is a plane. A plane is also arranged on the edge of the loose sheet. When the loose sheet is placed on the positioning column, the plane on the loose sheet contacts the plane on the positioning rod.

3. The automatic welding machine for stator core according to claim 2, characterized in that: The welding mechanism comprises a plurality of welding guns, which can be moved up and down synchronously, and can weld a plurality of welding positions of the loose pieces located at the welding station at the same time.

4. The automatic welding machine for stator core according to claim 3, characterized in that: The welding mechanism also includes: A first mounting plate is supported on the frame by a plurality of support rods; The lifting plate is supported on the support rod in an up-and-down manner, the lifting plate is located between the first mounting plate and the workbench, and the welding gun is arranged on the lifting plate.

5. The automatic welding machine for stator core according to claim 4, characterized in that: The welding mechanism also includes a smoking pipe, which is used for the welding gun to extract the smoke generated by welding during welding. The smoking pipe is suspended on the first mounting plate and can be moved up and down. When welding, the smoking pipe can move up and down with the welding gun.

6. The automatic welding machine for stator core according to claim 5, characterized in that ,, the height measuring mechanism comprises: A second mounting plate, disposed on the first mounting plate; A lifting frame is suspended below the second mounting plate so as to be movable up and down; Two third mounting plates are respectively arranged on two opposite sides of the lifting frame and can move up and down relative to the lifting frame; Two lower end detection rods are respectively arranged at the lower end of the third mounting plate and extend downward; Two fourth mounting plates are respectively arranged on the two third mounting plates and can move up and down relative to the third mounting plates; Two upper detection rods are arranged at the lower end of the fourth mounting plate and extend downward; The distance measuring sensor is fixed on the third mounting plate and its detection end is connected to the fourth mounting plate, and is used to detect the relative movement distance between the lower end detection rod and the upper end detection rod, and calculate the number of loose pieces through the distance.

7. The automatic welding machine for stator core according to claim 6, characterized in that: Two first guide rods are arranged between the third mounting plate and the lifting frame, the upper ends of the first guide rods are fixed on the lifting frame, the third mounting plate can slide within a certain range relative to the first guide rods, and a first spring is arranged on at least one of the first guide rods, the first spring is always in a compressed state, so that the lower end detection rod always has a tendency to move downward relative to the lifting frame; and / or, Two second guide rods are arranged on the third mounting plate, and the second guide rods extend downward. The fourth mounting plate is slidably arranged on the second guide rods. The fourth mounting plate can move within a certain range in the up and down directions relative to the third mounting plate. A second spring is arranged on the second guide rod, and the second spring is always in a compressed state.

8. The automatic welding machine for stator core according to claim 7, characterized in that: The height measurement mechanism also includes: A lower pressure plate, which can move up and down, and guide blocks are respectively arranged on the other two opposite sides of the lifting frame, and a third guide rod is arranged on each guide block and slides in the up and down directions, and the lower end of the third guide rod is connected to the lower pressure plate, and a third spring is arranged on the part of the third guide rod located between the lower pressure plate and the guide block, one end of the third spring rests on the lower pressure plate, and the other end rests on the corresponding guide block; the third spring is in a compressed state at least when the lower end detection rod touches the bottom plate.

9. An automatic welding method for a stator core, using the automatic welding machine for a stator core according to claim 8, characterized in that: The specific steps include: Step 1: Place the pre-arranged loose pieces on the base located at the loading station; Step 2: Driven by the turntable, the scattered pieces move to the height measuring station, and the height of the scattered pieces is detected by the height measuring mechanism, and based on the obtained height, it is determined whether the number of scattered pieces is consistent with the required number; Step 3: If the number of loose pieces is consistent with the required number, the turntable drives the loose pieces to move to the welding station; Step 4: Multiple welding guns of the welding mechanism move downward to weld different positions from top to bottom; Step 5: The turntable moves the welded pieces to the unloading station for unloading.

10. The automatic welding method for stator core according to claim 9, wherein the step 2 of measuring the height of the scattered pieces specifically adopts the following steps: Step 21, the lifting frame moves downward, and at the same time, the lower end detection rod and the upper end detection rod move downward together; Step 22, when the lifting frame moves downward to the first position, the lower end of the upper detection rod abuts against the uppermost loose piece; Step 23, the lifting frame continues to move downward, and when it moves to the second position, the lower pressing plate contacts the uppermost loose piece; Step 24, the lifting frame continues to move downward, and when it moves to the third position, the lower end of the lower detection rod abuts against the bottom plate; Step 25, obtaining the data change of the ranging sensor in executing steps 21 to 24 to obtain the height of the scattered pieces.

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