Motor liquid cooling shell welding equipment

Abstract

The present application relates to the technical field of welding, and specifically discloses a motor liquid-cooled shell welding device, which comprises a workbench, a rotating disc, an inner-outer positioning mechanism, a coaxial positioning mechanism and a pressing mechanism. The inner-outer positioning mechanism, the positioning shaft, the insert, the positioning locking assembly and the pressing mechanism are used for multi-dimensional guarantee of the concentricity of the inner cylinder, the outer cylinder, the annular plate and the welding machine from the bottom, the top and the side, so that the problems of weld offset, uneven penetration, one-side wide and one-side narrow of the welding seam of the welding machine and the like caused by the rotation centrifugal force of the inner cylinder, the outer cylinder and the annular plate are effectively avoided. Meanwhile, the pressing mechanism is provided with a plurality of circumferentially uniformly distributed pressing assemblies, which are matched with the bearing steps on the inner cylinder and the outer cylinder to realize the up-down bidirectional limiting of the annular plate, prevent the annular plate from floating due to the centrifugal force during the rotation and affect the welding quality of the welding seam, and the wear-reducing roller can prevent the annular plate from floating and radial movement due to thermal deformation without affecting the rotation of the workpiece.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically proposes a welding device for a liquid-cooled motor housing. Background Technology

[0002] The liquid-cooled housing of the motor (also known as the liquid-cooled casing / water jacket housing) is a core component that integrates cooling channels, provides structural support and sealing, and manages thermal energy. It is a standard component in high-power, high-density motors used in new energy vehicles, industrial servo motors, and wind power motors.

[0003] The motor liquid cooling housing has a double-layer jacket structure, consisting of an inner cylinder (attached to the stator) and an outer cylinder (forming a water channel interlayer) welded together with annular plates at both ends. Supporting steps are provided at the opposite ends of the inner and outer cylinders to support the annular plates. After the annular plates are placed on the steps between them, the welds between the inner cylinder and the annular plates and the welds between the outer cylinder and the annular plates are welded together, and the interlayer between the inner and outer cylinders is welded into a closed water jacket.

[0004] In the existing welding equipment for welding liquid-cooled outer shells, the inner and outer cylinders are positioned using existing positioning and clamping mechanisms. Then, an annular plate is placed on the supporting steps of both cylinders, and all three are driven to rotate. The laser welding machine only performs horizontal radial movement to weld the two seams. The following problems are prone to occur during the welding process:

[0005] 1. The inner and outer cylinders are only positioned by bottom clamping. During the rotation of the inner and outer cylinders, the centrifugal force can easily cause radial runout, resulting in continuous fluctuations in the coaxiality of the inner and outer cylinders and the welding mechanism. The laser spot will periodically shift relative to the weld, causing weld misalignment, uneven penetration, and incomplete penetration. In severe cases, one side of the weld will be wide while the other side is not fully penetrated.

[0006] 2. After the annular plate is placed on the supporting step, the annular plate is supported only by the supporting step. Its upper surface has no axial limit or radial locking. The combined effect of rotational centrifugal force and welding thermal deformation causes the annular plate to float radially and become eccentric as a whole. This further amplifies the coaxial deviation between the inner and outer cylinders, which directly affects the welding sealing performance, strength and pass rate of the liquid cooling shell. Summary of the Invention

[0007] In view of the above problems, embodiments of the present invention provide a welding device for liquid-cooled housings of motors to solve the technical problems in the related art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a liquid-cooled motor housing welding device, comprising: a worktable, a rotary table, an inner and outer positioning mechanism, a coaxial positioning mechanism, and a pressing mechanism.

[0009] The rotating disk is mounted on the worktable via bearings. The worktable is equipped with a rotation drive source (such as a motor connected to the central shaft of the rotating disk). The rotation drive source is fixedly installed at the bottom of the worktable (not shown in the figure) and is used to drive the rotating disk, inner and outer positioning mechanisms, inner and outer cylinders of the motor liquid-cooled housing, and annular plate to rotate synchronously. The rotation speed can be adjusted according to the welding process requirements to ensure uniform weld formation.

[0010] The inner and outer positioning mechanisms are fixed on the rotating disk and arranged concentrically with the rotating disk. They are existing mature coaxial positioning and clamping mechanisms, such as the expansion sleeve positioning mechanism, used to coaxially position and clamp the inner and outer cylinders after placement, preventing relative displacement between the inner and outer cylinders during rotation, ensuring that their relative positions are constant, and laying a coaxial foundation for subsequent welding.

[0011] The coaxial positioning mechanism is located on the worktable and directly above the rotating disk. It includes a positioning shaft concentric with and mounted on the rotating disk. The top of the worktable is equipped with a lifting frame and a lifting drive source for driving the lifting frame. Specifically: the lifting of the lifting frame is existing technology. The lifting frame consists of a vertical cylinder and an inverted L-shaped plate that slides onto the vertical cylinder. The lifting drive source (such as a hydraulic cylinder) is mounted on the worktable and located inside the vertical cylinder. The output end of the lifting drive source is fixedly connected to the bottom of the vertical section of the inverted L-shaped plate. A positioning pin is fixedly installed on the horizontal section of the inverted L-shaped plate of the lifting frame. The lower end of the positioning pin is rotatably connected to a plug via a bearing. The plug can be inserted and removed from the top of the positioning shaft. The side wall of the positioning pin is equipped with a mounting bracket. The mounting bracket is composed of a diagonal bar and a horizontal bar connected together. The diagonal bar, the horizontal bar, and the positioning pin form a triangle. The end of the horizontal bar away from the positioning pin is equipped with a positioning locking component. An adjustment component is installed on both the diagonal bar and the positioning pin. The adjustment component is equipped with a welding machine for welding the weld seam.

[0012] The pressing mechanism is located on the side wall of the positioning pin and is used to press against the top of the annular plate.

[0013] The positioning pin moves downward to insert and center the plug into the positioning shaft. The positioning locking component simultaneously clamps the top edges of the inner ring of the inner cylinder and the outer ring of the outer cylinder. The positioning pin is coaxially positioned with the rotating disk, inner cylinder, outer cylinder, and annular plate. The pressing mechanism simultaneously presses the top of the annular plate to limit its radial movement and floating. The welding machine follows the coaxial positioning structure and always remains coaxial with the inner cylinder, outer cylinder, and annular plate.

[0014] In one possible implementation, the pressing mechanism includes multiple sets of pressing components evenly distributed along the circumference of the positioning pin. Each set of pressing components consists of a connecting frame, a pressing plate, and a friction-reducing roller mounted on the lower end face of the pressing plate. The connecting frame is welded and fixed to the positioning pin, and the connecting frame and the positioning pin form a triangle. The pressing plate is installed at the lower end of the connecting frame on the side away from the positioning pin, and the width of the pressing plate is smaller than the width of the annular plate.

[0015] In one possible implementation, the positioning and locking assembly includes two symmetrically arranged locking plates slidably connected to a horizontal bar. The locking plates are arc-shaped plates with an inverted L-shaped vertical cross-section. The arc-shaped structure of the locking plates is adapted to the contours of the inner and outer cylinders. The lower end of the horizontal section of the locking plates is equipped with uniformly arranged anti-friction balls, and the vertical section is rotatably connected with uniformly arranged anti-friction rollers. A bidirectional locking drive source for driving the two locking plates is installed on the horizontal bar.

[0016] In one possible implementation, the plug-in is in the shape of an inverted frustum with a diameter that gradually decreases downwards. The top of the positioning shaft is provided with a tapered groove that mates with the plug-in. The sidewall of the tapered groove is also provided with a snap-fit ​​groove. The sidewall of the plug-in is provided with a snap-fit ​​component that snaps into the snap-fit ​​groove.

[0017] In one possible implementation, the snap-fit ​​component includes a snap-fit ​​block and a plurality of return springs. The side wall of the plug has a storage groove. The snap-fit ​​block is connected to the storage groove via the return springs. The side of the snap-fit ​​block away from the return springs and the conical side wall of the plug are rotatably connected to three anti-friction rollers.

[0018] In one possible implementation, the adjustment assembly is used to adjust the radial movement of the welding machine along the rotating disk to weld the weld between the inner cylinder and the annular plate, and the weld between the outer cylinder and the annular plate. After adjustment, the height of the welding machine from the weld is kept constant.

[0019] In one possible implementation, the adjustment assembly includes a through groove extending vertically through a diagonal rod. The diagonal rod also has two parallel, vertically arranged waist-shaped grooves that extend through the through groove. A movable seat is horizontally slidably connected within the through groove. A welding machine is mounted on the movable seat. The movable seat also has a vertical groove, within which two rotating rods are slidably connected. The two rotating rods extend through the waist-shaped grooves. The sides of the two rotating rods away from the movable seat are rotatably connected to a limit plate. An adjustment drive source for moving the movable seat is mounted on a positioning pin. A support frame is mounted on the side wall of the positioning pin, and the support frame is slidably connected to the movable seat, further improving the stability of the mounting base and the welding machine.

[0020] In one possible implementation, a plurality of reinforcing ribs are installed between the positioning shaft and the rotating disk, evenly arranged along the circumference of the positioning shaft. One end of the reinforcing rib is welded and fixed to the side wall of the positioning shaft, and the other end is welded and fixed to the upper surface of the rotating disk. This is used to improve the structural strength and rotational stability of the positioning shaft, prevent the positioning shaft from shaking when rotating at high speed, and thus ensure the coaxiality of the positioning shaft with the inner and outer cylinders.

[0021] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects: 1. The present invention, through multiple coaxial constraints of internal and external positioning mechanisms, positioning shafts, plugs, positioning locking components and pressing mechanisms, ensures the concentricity of the inner cylinder, outer cylinder, annular plate and welding machine from the bottom, top and side dimensions. It effectively avoids problems such as weld seam offset, uneven penetration depth and weld seam width on one side and narrowness on the other side caused by the centrifugal force of rotation between the inner cylinder and outer cylinder and the annular plate. At the same time, the pressing mechanism adopts multiple sets of circumferentially evenly distributed pressing components, which, together with the supporting steps on the inner cylinder and outer cylinder, realize bidirectional limiting of the annular plate, prevent the annular plate from floating due to centrifugal force during rotation, affecting the welding quality of the weld seam. Furthermore, the pressing mechanism does not affect the rotation of the workpiece, and can also prevent the annular plate from floating and radially moving due to thermal deformation, thereby improving the welding sealing and strength.

[0022] 2. The mounting bracket and positioning pin of the welding machine adjustment component of this invention form a triangular stable structure, which greatly improves the connection stability between the adjustment component and the positioning locking component and reduces the impact of welding vibration and centrifugal force on welding accuracy.

[0023] 3. The positioning and locking component in this invention is locked at the top edge of the inner ring of the inner cylinder and the outer ring of the outer cylinder, so that the welding machine is forced to be concentric with the inner cylinder and the outer cylinder under the action of the positioning shaft, the positioning pin and the positioning and locking component, and the welding machine always remains synchronized with the inner cylinder and the outer cylinder under the action of the positioning and locking component. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0026] Figure 2 This is a partial structural diagram of the coaxial positioning mechanism of the present invention.

[0027] Figure 3 This is a schematic diagram of the second partial structure of the coaxial positioning mechanism of the present invention.

[0028] Figure 4 This is the present invention. Figure 1 Main sectional view.

[0029] Figure 5 This is the present invention. Figure 4 Enlarged view of point A.

[0030] Figure 6 This is the present invention. Figure 4 Enlarged view of point B.

[0031] Figure 7 This is the present invention. Figure 4 Enlarged view of point C.

[0032] Figure label:

[0033] 1. Workbench; 2. Rotary disk; 4. Coaxial positioning mechanism; 40. Positioning shaft; 41. Reinforcing rib; 42. Lifting frame; 43. Positioning insert; 44. Insert; 440. Snap-fit ​​groove; 441. Return spring; 442. Locking block; 443. Anti-friction roller three; 45. Mounting frame; 450. Diagonal bar; 451. Horizontal bar; 46. Positioning locking assembly; 460. Locking plate; 461. Anti-friction roller two; 47. Adjustment assembly; 470. Through groove; 471. Moving seat; 472. Rotating rod; 473. Limiting plate; 474. Support frame; 48. Welding machine; 5. Pressing mechanism; 50. Connecting frame; 51. Pressing plate; 52. Anti-friction roller one; 7. Inner cylinder; 8. Outer cylinder; 9. Annular plate. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figure 1 A welding device for liquid-cooled motor housings includes: a worktable 1, a rotary table 2, internal and external positioning mechanisms, a coaxial positioning mechanism 4, and a pressing mechanism 5.

[0037] See Figure 1 The rotating disk 2 is rotatably mounted on the worktable 1 via bearings. The worktable is equipped with a rotation drive source (such as a drive motor, not shown in the figure). The rotation drive source is used to drive the rotating disk 2, the inner and outer positioning mechanisms, the inner cylinder 7 and outer cylinder 8 of the motor liquid-cooled shell, and the annular plate 9 to rotate synchronously. The rotation speed can be adjusted according to the welding process requirements to ensure uniform weld formation.

[0038] See Figure 1The inner and outer positioning mechanisms are fixed on the rotating disk 2 and arranged concentrically with the rotating disk 2. They are existing mature coaxial positioning and clamping mechanisms (such as expansion sleeve positioning mechanisms, which achieve coaxial clamping of the inner and outer cylinders through radial expansion). They are used to coaxially position and clamp the inner cylinder 7 and outer cylinder 8 after placement, prevent relative displacement between the inner cylinder 7 and outer cylinder 8 during rotation, ensure that their relative positions are constant, and lay a coaxial foundation for subsequent welding.

[0039] See Figure 1 The coaxial positioning mechanism 4 is located on the workbench 1 and directly above the rotating disk 2. It includes a positioning shaft 40 that is concentric with and mounted on the rotating disk 2. Multiple reinforcing ribs 41 are installed between the positioning shaft 40 and the rotating disk 2, evenly arranged around the circumference of the positioning shaft 40. One end of the reinforcing rib 41 is welded and fixed to the side wall of the positioning shaft 40, and the other end is welded and fixed to the upper surface of the rotating disk 2. This is used to improve the structural strength and rotational stability of the positioning shaft 40, prevent the positioning shaft 40 from shaking when rotating at high speed, and thus ensure the coaxiality of the positioning shaft 40 with the inner cylinder 7 and the outer cylinder 8.

[0040] See Figure 1 , Figure 2 and Figure 4 The workbench 1 has a lifting frame 42 on its top and a lifting drive source for driving the lifting frame 42 to move up and down. Specifically, the lifting frame 42 consists of a vertical cylinder and an inverted L-shaped plate that slides onto the vertical cylinder. The lifting drive source (such as a hydraulic cylinder) is installed on the workbench and located inside the vertical cylinder. The output end of the lifting drive source is fixedly connected to the bottom of the vertical section of the inverted L-shaped plate. A positioning pin 43 is fixedly installed on the horizontal section of the inverted L-shaped plate of the lifting frame 42. The lower end of the positioning pin 43 is rotatably connected to a plug 44 through a bearing. The plug 44 can be inserted and removed from the top of the positioning shaft 40. A mounting bracket 45 is provided on the side wall of the positioning pin 43. The system is composed of a diagonal rod 450 and a horizontal rod 451 connected together. The diagonal rod 450, the horizontal rod 451, and the positioning pin 43 form a triangle. The end of the horizontal rod 451 away from the positioning pin 43 is provided with a positioning locking component 46. An adjustment component 47 is installed on both the diagonal rod 450 and the positioning pin 43. The adjustment component 47 is equipped with a welding machine 48 for welding the weld seam. The adjustment component 47 is used to adjust the radial movement of the welding machine 48 along the rotating disk 2 to weld the weld seam between the inner cylinder 7 and the annular plate 9, and the weld seam between the outer cylinder 8 and the annular plate 9. After the adjustment component 47 adjusts the radial movement of the welding machine 48, the relative height between the welding machine and the weld seam remains constant.

[0041] See Figure 1 and Figure 4 The pressing mechanism 5 is located on the side wall of the positioning post 43 and is used to press against the top of the annular plate 9.

[0042] Special Note: The internal and external positioning mechanisms are existing mechanisms used to coaxially position and fix the inner cylinder 7 and outer cylinder 8 after placement. The welding machine 48 is an existing laser welding machine 48. Using existing equipment (or manually), the annular plate 9 is placed on the supporting steps of the inner cylinder 7 and outer cylinder 8, ensuring that the annular plate 9 is concentric with the inner cylinder 7 and outer cylinder 8. Then, the lifting frame 42 drives the positioning pin 43, welding machine 48, and pressing mechanism 5 to move downwards. The insert 44 at the lower end of the positioning pin 43 is inserted into the positioning shaft 40, thereby making... Positioning pin 43, insert 44, positioning shaft 40, inner cylinder 7, outer cylinder 8, and annular plate 9 remain concentric. At the same time, pressing mechanism 5 presses against the top of annular plate 9 to prevent the annular plate 9 from floating or shifting due to centrifugal force and its own gravity during the rotational welding process of inner cylinder 7, outer cylinder 8, and annular plate 9, and to prevent the annular plate 9 from radially shifting due to thermal stress deformation caused by heat during welding. This would cause the annular plate 9 to become eccentric with inner cylinder 7 and outer cylinder 8, resulting in poor welding sealing and low strength of the liquid cooling shell.

[0043] Simultaneously, the positioning and locking component 46 is engaged with the top edges of the inner ring of the inner cylinder 7 and the outer ring of the outer cylinder 8, so that the welding machine 48 is forced to be concentric with the inner cylinder 7 and the outer cylinder 8 under the action of the positioning shaft 40, the positioning pin 43 and the positioning and locking component 46. Under the action of the positioning and locking component 46, the welding machine 48 always remains synchronized with the inner cylinder 7 and the outer cylinder 8, effectively preventing the top of the inner cylinder 7 and the outer cylinder 8 from shifting due to centrifugal force during rotation, which would cause the weld seam welded by the welding machine 48 to be wider on one side and narrower on the other, or even in severe cases, one side is welded but the other side is not fully melted. Finally, the drive motor installed on the worktable 1 drives the rotating disk 2 to rotate, and the rotating disk 2 drives the inner and outer positioning mechanisms and the inner cylinder 7, the outer cylinder 8 and the ring plate 9 fixed on them to rotate synchronously, and the welding machine 48 welds the seam.

[0044] See Figure 1 , Figure 4 and Figure 7 The pressing mechanism 5 includes multiple sets of pressing components evenly distributed around the positioning post 43. Each pressing component consists of a connecting frame 50, a pressing plate 51, and a friction-reducing roller 52 mounted on the lower end face of the pressing plate 51. The connecting frame 50 is welded and fixed to the positioning post 43, and the connecting frame 50 and the positioning post 43 form a triangle to improve the rigidity of the pressing component. The pressing plate 51 is installed at the lower end of the connecting frame 50 on the side away from the positioning post 43. The width of the pressing plate 51 is smaller than the width of the annular plate 9, which can prevent the pressing plate 51 from contacting the weld bead formed by welding, thus preventing damage to the weld and affecting the welding quality. The axis of the friction-reducing roller 52 is perpendicular to the axis of the annular plate 9.

[0045] When the insert 44 at the lower end of the positioning pin 43 is positioned and inserted into the positioning shaft 40, the anti-friction roller at the bottom of the pressure plate 51 presses the annular plate 9 against the supporting step. Multiple sets of pressure components are evenly arranged to press the annular plate 9, thereby improving the stability of the annular plate 9. At the same time, the anti-friction roller 52 installed at the bottom of the pressure plate 51 does not affect the rotation of the annular plate 9 and is perpendicular to the axis of the annular plate 9, so that the annular plate 9 does not move under the pressure of the pressure plate 51. This prevents the annular plate 9 from floating and shifting due to the centrifugal force of rotation and its own gravity during the rotational welding process of the inner cylinder 7, the outer cylinder 8, and the annular plate 9, and also prevents the annular plate 9 from radially shifting due to thermal stress deformation caused by heat during welding.

[0046] See Figure 1 , Figure 4 and Figure 5 The positioning and locking assembly 46 includes two symmetrically arranged locking plates 460 slidably connected to the horizontal rod 451. The locking plates 460 are arc-shaped plates with an inverted L-shaped vertical cross section. The arc structure of the locking plates 460 is adapted to the contours of the inner cylinder 7 and the outer cylinder 8. The lower end of the horizontal section of the locking plates 460 is equipped with uniformly arranged anti-friction balls, and the vertical section is rotatably connected with uniformly arranged anti-friction rollers 461. Both the anti-friction balls and the anti-friction rollers 461 are made of wear-resistant material, which can reduce the friction between the locking plates 460 and the inner cylinder 7 and the outer cylinder 8, avoid damage to the workpiece surface, and at the same time not affect the rotation of the workpiece. A bidirectional locking drive source for driving the two locking plates 460 is installed on the horizontal rod 451.

[0047] After the pressing mechanism 5 presses against the annular plate 9, the bidirectional locking drive source (such as a bidirectional hydraulic cylinder with two output ends connected to two clamping plates 460) drives the clamping plate 460 to press against the inner wall of the inner cylinder 7 and the outer wall of the outer cylinder 8, so that the welding machine 48 always maintains coaxial rotation with the inner cylinder 7 and the outer cylinder 8 under the action of the positioning and locking component 46, effectively preventing the top of the inner cylinder 7 and the outer cylinder 8 from shifting due to centrifugal force during rotation.

[0048] See Figure 1 , Figure 4 and Figure 6 The plug-in 44 is in the shape of an inverted frustum with a diameter that gradually decreases downwards. The top of the positioning shaft 40 is provided with a conical groove that mates with the plug-in 44. The side wall of the conical groove is also provided with a snap-fit ​​groove 440. The side wall of the plug-in 44 is provided with a snap-fit ​​component, which snaps into the snap-fit ​​groove 440.

[0049] See Figure 1 , Figure 4 and Figure 6The snap-fit ​​component includes a snap-fit ​​block 442 and multiple return springs 441. The side wall of the plug 44 is provided with a storage groove. The snap-fit ​​block 442 is connected to the storage groove through the return springs 441. The side of the snap-fit ​​block 442 away from the return springs 441 and the conical side wall of the plug 44 are rotatably connected to the friction-reducing rollers 443.

[0050] The lower end of the plug 44 is shaped like an inverted cone to facilitate its insertion into the conical groove. Under natural conditions, the return spring 441 is in the unfolded state. After the plug 44 enters the conical groove, the friction-reducing roller 443 on the locking block 442 contacts the side wall of the conical groove. At this time, the locking block 442 is squeezed and presses the return spring 441 and enters the receiving groove until the friction-reducing roller 443 on the conical side wall of the plug 44 contacts the conical groove. When the positioning shaft 40 rotates with the rotating disk 2 and the locking block 442 is aligned with the receiving groove, the locking block 442 enters the locking groove 440 under the elastic force of the return spring 441. This causes the plug 44 to rotate with the positioning shaft 40, thereby making the plug 44, the positioning pin 43 and the positioning shaft 40 coaxial, and ensuring the stability of the plug 44 and the positioning pin 43.

[0051] See Figure 1 , Figure 2 , Figure 3 and Figure 5 The adjustment assembly 47 includes a through groove 470 extending vertically through a diagonal rod 450. Two parallel, vertically arranged waist-shaped grooves are also provided on the diagonal rod 450, penetrating the through groove 470. A movable seat 471 is horizontally slidably connected within the through groove 470. A welding machine 48 is mounted on the movable seat 471. A vertical groove is also provided on the movable seat 471, with two rotating rods 472 slidably connected within it. The two rotating rods 472 each penetrate the waist-shaped groove. The sides of the two rotating rods 472 furthest from the movable seat 471 are rotatably connected to a limit plate 473. An adjustment drive source for moving the movable seat 471 is installed on the positioning pin 43. A support frame 474 is installed on the side wall of the positioning pin 43, and the support frame 474 is slidably connected to the movable seat 471, further improving the stability of the mounting base and the welding machine 48.

[0052] The adjustment drive source is a cylinder, which pushes the moving seat 471 to move. The moving seat 471 drives the welding machine 48 to move. When the moving seat 471 moves along the through groove 470, it drives the upper and lower rotating rods 472 to move along the waist-shaped groove. At the same time, the upper and lower rotating rods 472 slide along the vertical groove. Under the linkage constraint of the upper and lower rotating rods 472, the double parallel waist-shaped groove and the vertical groove, the position of the welding machine 48 is adjusted, the height remains unchanged, and the stability of the movement of the welding machine 48 is improved.

[0053] It should be noted that this equipment is used in a dedicated welding production line for the liquid-cooled housing of drive motors in new energy vehicles, with a single model and large-scale production mode, in order to pursue the ultimate production efficiency and product consistency.

[0054] See Figures 1 to 7 In practice, the inner cylinder 7 and outer cylinder 8 are first placed on the inner and outer positioning mechanisms using existing feeding equipment or manual labor. These mechanisms then coaxially position and clamp the inner and outer cylinders 8. Next, the annular plate 9 is placed on the supporting steps at the ends of the inner and outer cylinders 7 and 8, ensuring that the annular plate 9 is concentric with the inner and outer cylinders 8. The lifting frame 42 is then activated, causing the positioning pin 43, welding machine 48, and pressing mechanism 5 to descend synchronously. This allows the insert 44 at the lower end of the positioning pin 43 to insert into the tapered groove of the positioning shaft 40, achieving concentricity and synchronization between the positioning pin 43 and the positioning shaft 40. Simultaneously, the pressing mechanism... The anti-friction roller 52 of mechanism 5 presses against the top of the annular plate 9, completing the limiting of the annular plate 9; then the two clamping plates 460 of the positioning and locking assembly 46 are activated to move towards each other, clamping the inner wall of the inner cylinder 7 and the outer wall of the outer cylinder 8, further ensuring that the welding machine 48 is coaxial with the inner and outer cylinders 8; finally, the drive motor is activated to drive the rotating disk 2, the inner and outer positioning mechanisms and the workpiece to rotate synchronously, and the laser welding machine 48 is activated to perform welding. After one weld is welded, the radial position of the welding machine 48 is adjusted by the adjusting assembly 47 to weld the other weld, thereby completing the entire welding process.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An electric machine liquid-cooled housing welding apparatus characterized by comprising: include: Worktable, rotary table, internal and external positioning mechanisms, coaxial positioning mechanism and pressing mechanism; The rotating disk is mounted on the worktable, which is equipped with a rotary drive source. The rotary drive source is used to drive the rotating disk, the inner and outer positioning mechanisms, the inner and outer cylinders of the motor liquid-cooled housing, and the annular plate to rotate synchronously. The inner and outer positioning mechanisms are fixedly mounted on the rotating disk and are used to coaxially position and clamp the inner and outer cylinders and the rotating disk. A coaxial positioning mechanism is located on a workbench and includes a positioning shaft concentric with and mounted on a rotating disk. A lifting frame and a lifting drive source for driving the lifting frame to move up and down are provided on the top of the workbench. A positioning pin is provided on the lifting frame. The lifting frame drives the positioning pin to move up and down. The lower end of the positioning pin is rotatably connected to a plug that is inserted into the top of the positioning shaft. A mounting frame is provided on the side wall of the positioning pin. The mounting frame is composed of a diagonal bar and a horizontal bar. The positioning pin, the diagonal bar and the horizontal bar form a triangle. A positioning locking component is provided at the end of the horizontal bar away from the positioning pin. An adjustment component is installed on both the diagonal bar and the positioning pin. A welding machine for welding the weld seam is provided on the adjustment component. The pressing mechanism, located on the side wall of the positioning pin, is used to press against the top of the annular plate; The plug is shaped like an inverted frustum with a diameter that gradually decreases downwards. The top of the positioning shaft is provided with a tapered groove that mates with the plug. The side wall of the tapered groove is also provided with a snap-fit ​​groove. The side wall of the plug is provided with a snap-fit ​​component that snaps into the snap-fit ​​groove. The adjustment assembly includes a through groove extending vertically through a diagonal rod, and two parallel waist-shaped grooves arranged vertically on the diagonal rod. The waist-shaped grooves pass through the through groove, and a movable seat is horizontally slidably connected inside the through groove. A welding machine is mounted on the movable seat. The movable seat also has a vertical groove, and two rotating rods are slidably connected inside the vertical groove. The two rotating rods pass through the waist-shaped grooves respectively, and the side of the two rotating rods away from the movable seat is rotatably connected to a limit plate. An adjustment drive source for driving the movable seat to move is installed on the positioning pin. The snap-fit ​​component includes a snap-fit ​​block and multiple return springs. The side wall of the plug has a storage groove. The snap-fit ​​block is connected to the storage groove through the return springs. The side of the snap-fit ​​block away from the return springs and the conical side wall of the plug are rotatably connected to three anti-friction rollers. The positioning pin moves down to make the plug-in and positioning shaft fit together and center. The positioning locking component simultaneously clamps the top edge of the inner ring of the inner cylinder and the outer ring of the outer cylinder. The positioning pin is coaxially positioned with the rotating disk, inner cylinder, outer cylinder and annular plate. The pressing mechanism simultaneously presses the top of the annular plate to limit its radial movement and floating. The welding machine follows the coaxial positioning structure and always remains coaxial with the inner cylinder, outer cylinder and annular plate.

2. A motor liquid-cooled housing welding apparatus according to claim 1, characterized by: The pressing mechanism includes multiple sets of pressing components evenly distributed along the circumference of the positioning pin. Each set of pressing components consists of a connecting frame, a pressing plate, and a friction-reducing roller mounted on the lower end face of the pressing plate. The axis of the friction-reducing roller is perpendicular to the axis of the annular plate. The connecting frame and the positioning pin form a triangle. The pressing plate is installed at the lower end of the connecting frame on the side away from the positioning pin. The width of the pressing plate is smaller than the width of the annular plate.

3. A motor liquid-cooled housing welding apparatus according to claim 1, characterized by: The positioning and locking assembly includes two locking plates slidably connected to a horizontal bar and arranged symmetrically. The locking plates are arc-shaped plates with an inverted L-shaped vertical cross section. The lower end of the horizontal section of the locking plate is equipped with uniformly arranged anti-friction balls, and the vertical section is rotatably connected with uniformly arranged anti-friction rollers. A bidirectional locking drive source for driving the two locking plates is installed on the horizontal bar.

4. The motor liquid-cooled housing welding equipment according to claim 1, characterized in that: The adjustment component is used to adjust the radial movement of the welding machine along the rotating disk to weld the weld between the inner cylinder and the annular plate, and the weld between the outer cylinder and the annular plate. After the adjustment component adjusts the radial movement of the welding machine, the relative height between the welding machine and the weld is constant.

5. The motor liquid-cooled housing welding equipment according to claim 1, characterized in that: The side wall of the positioning pin is equipped with a support frame, which is slidably connected to the movable seat.

6. The motor liquid-cooled housing welding equipment according to claim 1, characterized in that: Multiple reinforcing ribs are installed between the positioning shaft and the rotating disk, evenly arranged along the circumference of the positioning shaft.

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