Laser welding apparatus for food processor guard

Abstract

The cooking rod protective cover laser welding device relates to the technical field of laser welding and comprises a base, a rotary driving mechanism, a clamping mechanism and a welding mechanism. The base is provided with a guide rail, the rotary driving mechanism comprises a transmission shaft chuck and a driving motor, the clamping mechanism comprises an outer clamp and an inner clamp, and the clamps are provided with roller assemblies. The welding mechanism comprises outer and inner offset welding guns fixed on the inner and outer clamps. When feeding, the protective cover workpiece is sleeved on the transmission shaft and clamped by the inner and outer clamp rollers; when welding, the double welding guns are used to spot weld the welding points first, and then the driving motor drives the workpiece to rotate to realize synchronous continuous welding on both sides. The device integrates the traditional two welding into a single welding, which can improve the welding efficiency, and the clamping mechanism can avoid the deformation of the thin-walled part.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a laser welding device for a protective cover of a cooking stick. Background Art

[0002] A blender (also known as a hand blender) is a small, electric tool commonly used in modern kitchens. Its core function is to blend, crush, or mix ingredients using its high-speed rotating blades. Among the key components of a blender, the protective cover encloses the blades, guiding the flow of ingredients and preventing splatter.

[0003] In the manufacturing process of food processors, the welding connection between the drive shaft and the protective cover is a critical process step in determining the product's mechanical performance and reliability. Existing processes typically use single-sided rotary welding, requiring two separate welding steps to weld both sides of the protective cover. This results in low welding efficiency, and uneven heat input during single-sided welding can easily lead to asymmetric deformation, resulting in significant post-weld coaxiality deviation. Furthermore, the thin-walled structure of the protective cover is prone to indentation or deformation when clamped, making traditional rigid clamps unable to provide uniform support. Summary of the Invention

[0004] In view of this, the present invention provides a laser welding device for a food processor protective cover, wherein the clamp can provide uniform clamping force, the protective cover is not prone to indentation or deformation, and can perform synchronous double-sided welding, resulting in higher welding efficiency.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions.

[0006] Laser welding equipment for food processor protective cover, including:

[0007] an abutment having a guide rail provided on its upper surface;

[0008] The rotary drive mechanism includes a transmission shaft chuck and a drive motor, wherein the transmission shaft chuck is mounted on the upper surface of the base, and the drive motor is in transmission connection with the transmission shaft chuck;

[0009] The clamping mechanism includes an outer clamp and an inner clamp, wherein the outer clamp is coaxially arranged with the transmission shaft chuck and is slidably connected with the guide rail, and a plurality of roller assemblies are uniformly distributed circumferentially on the outer clamp and the inner clamp;

[0010] The welding mechanism includes an outer welding gun and an inner welding gun arranged in a staggered manner, wherein the outer welding gun is fixedly connected to the outer clamp and is located on the outer curved surface side of the protective cover workpiece, and the inner welding gun is fixedly connected to the inner clamp and is located on the inner curved surface side of the protective cover workpiece;

[0011] During loading, the transmission shaft workpiece is inserted into the transmission shaft chuck through the outer clamp, the protective cover workpiece is sleeved on the transmission shaft workpiece, and the inner clamp is pushed toward the outer clamp so that the inner clamp and the outer clamp cooperate to clamp the protective cover workpiece;

[0012] During welding, the outer welding gun and the inner welding gun first spot weld their respective welding points to preliminarily fix the drive shaft workpiece and the protective cover workpiece, and then drive the motor to drive the drive shaft chuck to rotate, so that the drive shaft workpiece drives the protective cover workpiece to rotate. During the rotation process, the outer welding gun and the inner welding gun perform synchronous double-sided welding.

[0013] The synchronous double-sided welding design using an outer welding gun and an inner welding gun eliminates the time interval required to complete the welding of both sides in two steps during traditional single-sided rotary welding. The welding of both inner and outer surfaces can be completed in a single rotation without the need for step-by-step operation, shortening the welding time required. The outer and inner welding guns are staggered, and the double-sided synchronous welding ensures uniform heat input to the inner and outer sides, avoiding asymmetric deformation caused by unilateral heat input, thereby reducing coaxial deviation after welding. During welding, the workpiece is initially fixed by spot welding, and then a continuous weld is completed by rotary synchronous welding, reducing the risk of workpiece displacement. The rollers of the inner and outer clamps provide uniform clamping force, preventing indentations or deformation of thin-walled protective covers caused by rigid clamping.

[0014] Preferably, the outer clamp comprises:

[0015] The slide bracket has a base that is slidably connected to the guide rail, an inner ring for the transmission shaft workpiece to pass through is provided on its upper portion, and an outer welding gun is fixed on its base;

[0016] The outer contour positioning ring seat is coaxially mounted on the inner ring of the slide bracket, and its inner edge contour forms a clearance fit with the outer curved surface of the protective cover workpiece;

[0017] An external linear drive is fixedly mounted on the base, and an output end thereof is fixedly connected to the base of the slide bracket;

[0018] The inner clamp includes:

[0019] Cantilever bracket, the inner welding gun is fixed on the cantilever bracket;

[0020] The inner contour positioning ring seat is installed at the front end of the cantilever bracket, and its outer edge contour is adapted to the inner curved surface of the protective cover workpiece and is provided with an avoidance opening for avoiding the inner welding gun;

[0021] The propulsion assembly includes an inner linear drive and an avoidance drive, wherein the avoidance drive is fixed on the base, the inner linear drive is installed on the output end of the avoidance drive, and the cantilever bracket is fixed on the output end of the inner linear drive;

[0022] Wherein, a plurality of installation cavities are provided inside the outer contour positioning ring seat and the inner contour positioning ring seat;

[0023] The roller assembly includes:

[0024] Rollers, the inclination angle of the working surface of each roller is adapted to the curved surface of the protective cover;

[0025] A floating bearing seat elastically connected to the mounting cavity;

[0026] The first bearing is used to realize the rotational connection between the roller and the floating bearing seat.

[0027] By elastically connecting the floating bearing seat to the mounting cavity, the roller can, on the one hand, roll over the welding slag to prevent the welding slag from jamming the roller due to rigid contact; on the other hand, it can adapt to slight deviations in the curved surface of the protective cover, provide flexible clamping force, and avoid deformation caused by rigid contact; at the same time, the roller can rotate freely, which can reduce damage to the surface of the protective cover due to friction during welding, and match the curved surface of the protective cover workpiece by the inclination angle of the working surface to provide uniform clamping force, thus avoiding indentations or deformation of the thin-walled protective cover due to rigid clamping.

[0028] The inner edge of the outer locating ring seat forms a clearance fit with the outer curved surface of the protective cover, while the outer edge of the inner locating ring seat conforms to the inner curved surface of the protective cover, ensuring precise positioning of the workpiece during clamping and maintaining the coaxiality of the drive shaft and the protective cover. A clearance opening on the inner locating ring seat provides operating space for the inner welding gun, ensuring accurate alignment of the inner welding gun with the weld seam. The sliding connection between the slide bracket and the guide rail allows axial movement of the outer clamp, facilitating loading and unloading and adjusting the welding position.

[0029] Preferably, the inner clamp further comprises a locking mandrel, and the locking mandrel comprises:

[0030] The core shaft body is coaxially arranged with the inner contour positioning ring seat, the tail end of which is rotatably connected to the cantilever bracket, and the front end of which extends out of the inner ring of the inner contour positioning ring seat. A hollow cavity is provided inside the core shaft body, and the hollow cavity is connected to the external air source. A lock bolt hole is provided on the side wall of the hollow cavity;

[0031] The pneumatic drive unit includes a drive piston, a radial lock tongue, and a return spring. The drive piston is disposed in the hollow cavity. The radial lock tongue is disposed in a sliding engagement with the lock tongue hole. The bottom of the radial lock tongue is provided with an inclined surface structure. The two ends of the return spring are respectively connected to the radial lock tongue and the side wall of the core shaft body to provide an elastic force for the radial lock tongue to automatically retract.

[0032] The front end of the locking mandrel is inserted into the inner hole of the transmission shaft workpiece. Under the action of air pressure, the radial locking tongue extends out and engages with the inner hole of the transmission shaft workpiece.

[0033] By providing a locking mandrel, the front end of the locking mandrel is inserted into the inner hole of the drive shaft during clamping. Air pressure drives the radial locking tongue to extend and engage with the inner hole of the drive shaft workpiece. This, combined with the drive shaft chuck, achieves coaxial locking of both ends of the drive shaft workpiece, further improving coaxiality between the workpieces and ensuring welding accuracy. The air pressure drive unit automatically extends and retracts the radial locking tongue, facilitating the loading and unloading of the drive shaft workpiece and improving operational convenience.

[0034] Preferably, both the outer clamp and the inner clamp are provided with a roller locking assembly, and the roller locking assembly comprises:

[0035] The locking ring seat has multiple piston cavities spaced apart inside, and the piston cavities correspond one-to-one with the floating bearing seats. The piston cavities are provided with drive holes and openings. The drive holes are located on the inner ring surface of the locking ring seat, and the openings of the piston cavities are aligned with the corresponding floating bearing seats. The locking ring seats on the outer and inner clamps are coaxially stacked on the bottom ends of the outer and inner positioning ring seats, respectively.

[0036] A plurality of locking piston rods are provided, each locking piston rod is slidably assembled in each piston cavity, and the output end of the locking piston rod is located in the opening;

[0037] A locking spring, which is provided in plurality and is disposed one by one in the piston cavity, with two ends of the locking spring respectively connected to the bottom of the locking piston rod and the bottom wall of the piston cavity to push the locking piston rod out of the piston cavity;

[0038] An air pressure distribution ring is nested in the inner ring surface of the locking ring seat and rotated together. A ventilation groove is provided on the outer ring surface of the air pressure distribution ring. The movement trajectory of the ventilation groove corresponds to the position of each driving air hole. The air pressure distribution ring of the outer clamp has an air supply ring groove on its outer ring surface. The air supply ring groove is connected to the ventilation groove, and the position of the air supply ring groove corresponds to the outlet position of the air supply hole. The air pressure distribution ring of the inner clamp is fixedly sleeved with the core shaft body, and its ventilation groove is connected to the hollow cavity of the core shaft body.

[0039] A clockwork spring is used to drive the air pressure distribution ring to reset and rotate;

[0040] The outboard fixture also includes:

[0041] An air pressure supply ring is nested in the inner ring of the slide bracket and is provided with an air supply hole therethrough. The inlet of the air supply hole is located on the outer ring surface of the air pressure supply ring and is connected to an external air source. The outlet of the air supply hole is located on the inner ring surface of the air pressure supply ring.

[0042] The top pressure follower assembly includes a top pressure block and a top pressure hole. The top pressure hole is arranged at one end of the air pressure distribution ring of the outer clamp close to the roller assembly. The top pressure block and the top pressure hole are slidably matched. A top pressure spring is provided in the top pressure hole. The two ends of the top pressure spring are respectively connected to the bottom of the top pressure block and the bottom wall of the top pressure hole. The top surface contour of the top pressure block is adapted to the outer curved surface of the protective cover workpiece.

[0043] By providing a roller locking assembly, the locking piston rod, initially pressed against the corresponding floating bearing seat by the locking spring, keeps each floating bearing seat locked and immobile, preventing the workpiece from bouncing. Because welding slag is primarily concentrated around the weld point, it will sequentially pass through each roller as the workpiece rotates. By synchronizing the air pressure distribution ring with the workpiece and integrating the venting grooves with the drive holes, air pressure retracts the corresponding locking piston rod only when the venting grooves pass through the corresponding drive holes, unlocking the corresponding floating bearing seat. This precisely controls the locking state of each roller, ensuring initial stability and preventing the floating bearing seat from slipping and affecting clamping stability. However, the roller assembly is unlocked immediately when welding slag passes through the corresponding roller, allowing the roller to roll over the slag and avoid jamming. After welding is completed, the spring-loaded air pressure distribution ring resets, causing each locking piston rod to extend and engage the floating bearing seat, restoring the lock.

[0044] Preferably, a blade cavity is provided within the floating bearing seat, and a driving blade is provided at the end of the roller shaft of the roller. The driving blade is located within the blade cavity, and the blade cavity is provided with two blade air holes, one of which is connected to an external air source and aligned with the driving blade, so that the external air source can eject air through the blade air hole to drive the roller to rotate. The external air source is used to drive the driving blade through the blade cavity, causing the roller to rotate automatically, reducing frictional resistance between the protective cover and the roller during rotation, allowing the protective cover workpiece to rotate more smoothly during welding, and cooperating with the overall rotation drive mechanism to ensure the uniformity and stability of the welding trajectory. The roller's active rotation design also avoids sliding friction between the protective cover workpiece and the roller, reducing heat and surface wear generated by friction, and protecting the surface quality of the protective cover workpiece.

[0045] Preferably, the roller assembly also includes a slag scraper and a collection pipe. The slag scraper is fixedly mounted on the floating bearing seat and located on one side of the roller. Its blade contacts the roller's working surface to scrape away slag adhering to the roller as the roller rotates. The collection pipe is connected to an external exhaust device, and the suction port of the collection pipe is located near the blade of the slag scraper to absorb the slag removed by the scraper. The slag scraper is fixed to the floating bearing seat, with its blade contacting the roller's working surface. As the roller rotates, it automatically scrapes away slag adhering to the roller, preventing slag accumulation that could affect the roller's clamping accuracy and smooth rotation, and preventing residual slag from scratching or contaminating the protective cover surface. Prompt removal of slag prevents slag from entering the weld seam or weld area, reducing weld defects (such as porosity and slag inclusions) caused by slag inclusion, thereby improving weld cleanliness and quality.

[0046] Preferably, both the outer and inner welding guns are equipped with slag suction pipes, which are connected to an external exhaust device. The suction nozzles of the slag suction pipes are located near the weld point to remove the slag generated during welding. The suction nozzles of the slag suction pipes are located near the weld point, and the external exhaust device is used to remove the slag and smoke generated during welding in real time, keeping the welding area clean, improving the working environment, and ensuring the stability of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the three-dimensional structure of the laser welding equipment for the protective cover of the cooking stick of the present invention.

[0048] Figure 2 This is an exploded view of the laser welding device for a food processor protective cover according to the present invention (the base is hidden for ease of display).

[0049] Figure 3 Schematic diagram of the three-dimensional structure of the outer clamp.

[0050] Figure 4 This is an exploded view of the outer fixture.

[0051] Figure 5 Schematic diagram of the three-dimensional structure of the inner clamp.

[0052] Figure 6 This is an exploded view of the inner fixture.

[0053] Figure 7 A three-dimensional cross-sectional view of the roller locking assembly.

[0054] Figure 8 An exploded view of the roller assembly.

[0055] Figure 9 A cross-sectional view of the inner fixture.

[0056] Figure 10 A three-dimensional cross-sectional view of the inner clamp.

[0057] Reference numerals include:

[0058] Base 1, guide rail 11, transmission shaft chuck 12, drive motor 13;

[0059] Outer fixture 2, slide bracket 21, inner ring 211, base 212, outer contour positioning ring seat 22, outer ring seat cover 221, mounting cavity 222, outer linear drive 23, air pressure supply ring 24, air supply hole 241, top pressure block 242, ring channel 243;

[0060] Inner fixture 3, cantilever bracket 31, inner contour positioning ring seat 32, avoidance opening 321, inner ring seat cover 322, propulsion assembly 33, inner linear actuator 331, avoidance actuator 332, locking mandrel 34, mandrel body 341, hollow cavity 3411, drive piston 3412, radial locking tongue 3413, return spring 3414;

[0061] Roller assembly 4, roller 41, driving blade 411, driving airflow ring 412 of the outer fixture, driving airflow ring 413 of the inner fixture, floating bearing seat 42, blade cavity 421, floating spring 422, blade air hole 423, first bearing 43, welding slag scraper 44, collection pipe 45, welding slag collection ring 46;

[0062] The inner clamp includes a locking ring seat 51, a piston chamber 511, a driving air hole 512, a locking piston rod 52, a locking spring 53, an air pressure distribution ring 54 of the outer clamp, an air supply ring groove 541, a second bearing 542, an air pressure distribution ring 55 of the inner clamp, a third bearing 551, a vent groove 56, a spring spring 57, and a locking ring seat 58 of the outer clamp.

[0063] Outer welding gun 6, inner welding gun 7, welding slag adsorption pipe 71;

[0064] Protective cover workpiece 8, transmission shaft workpiece 9. DETAILED DESCRIPTION

[0065] The present invention is described in detail below with reference to specific embodiments.

[0066] Combine Figure 1 and Figure 2 The laser welding device for the food processor shield of this embodiment includes a base 1, a rotary drive mechanism, a clamping mechanism, and a welding mechanism. A guide rail 11 is provided on the upper surface of the base 1. The rotary drive mechanism includes a transmission shaft chuck 12 and a drive motor 13. The transmission shaft chuck 12 is fixedly mounted on the upper surface of the base 1. The drive motor 13 is connected to the transmission shaft chuck 12 via a pulley. The clamping mechanism includes an outer clamp 2 and an inner clamp 3. The outer clamp 2 is coaxially arranged with the transmission shaft chuck 12 and is slidably connected to the guide rail 11. Figure 3 and Figure 5 , multiple roller assemblies 4 are evenly distributed on the outer clamp 2 and the inner clamp 3 in the circumferential direction. Figure 2 The welding mechanism includes an outer welding gun 6 and an inner welding gun 7 that are staggered. The outer welding gun 6 is fixedly connected to the outer clamp 2, and the outer welding gun 6 is located on the outer curved surface side of the protective cover workpiece 8. The inner welding gun 7 is fixedly connected to the inner clamp 3, and the inner welding gun 7 is located on the inner curved surface side of the protective cover workpiece 8.

[0067] When loading, the transmission shaft workpiece 9 is inserted into the transmission shaft chuck 12 through the outer clamp 2, the protective cover workpiece 8 is sleeved on the transmission shaft workpiece 9, and the inner clamp 3 is pushed to the outer clamp 2, so that the inner clamp 3 and the outer clamp 2 cooperate to clamp the protective cover workpiece 8; when welding, the outer welding gun 6 and the inner welding gun 7 first perform spot welding positioning on the respective welding points to preliminarily fix the transmission shaft workpiece 9 and the protective cover workpiece 8, and then the driving motor 13 drives the transmission shaft chuck 12 to rotate, so that the transmission shaft workpiece 9 drives the protective cover workpiece 8 to rotate, and the outer welding gun 6 and the inner welding gun 7 perform synchronous double-sided welding during the rotating process.

[0068] Through the synchronous double-sided welding design of the outer welding gun 6 and the inner welding gun 7, the time interval of the traditional single-sided rotary welding for completing two-sided welding twice is eliminated, and the welding of the inner and outer surfaces can be completed at one time without step-by-step operation, thereby shortening the welding time. The outer welding gun 6 and the inner welding gun 7 are arranged in a staggered manner, and the synchronous double-sided welding makes the heat input of the inner and outer sides uniform, avoids the asymmetric deformation caused by single-sided heat input, and thus reduces the coaxiality deviation after welding. The workpiece is preliminarily fixed by spot welding during welding, and then the continuous weld is completed by synchronous welding, thereby reducing the risk of workpiece displacement. The roller assembly 4 of the inner and outer clamps provides uniform clamping force, and avoids the generation of indentation or deformation of the thin-walled protective cover due to rigid clamping.

[0069] As shown in Figure 2-Figure 4 , the outer clamp 2 includes a sliding table support 21, an outer contour positioning ring seat 22 and an outer linear driver 23. The base 212 of the sliding table support 21 is in sliding connection with the guide rail 11, and the upper part of the sliding table support 21 is provided with an inner ring 211 for the transmission shaft workpiece 9 to pass through. The outer contour positioning ring seat 22 is coaxially installed with the inner ring 211, and the inner edge contour thereof is in clearance fit with the outer curved surface of the protective cover workpiece 8. The outer linear driver 23 is fixedly arranged on the base 1, and the output end thereof is fixedly connected with the base 212.

[0070] In combination with Figure 1 , Figure 5 and Figure 6 , the inner clamp 3 includes a cantilever support 31, an inner contour positioning ring seat 32 and a pushing assembly 33. Referring to Figure 5 , the inner contour positioning ring seat 32 is installed at the front end of the cantilever support 31, and the outer edge contour thereof is adapted to the inner curved surface of the protective cover workpiece 8 and is provided with an avoiding opening 321 for avoiding the inner welding gun 7, the avoiding opening 321 being V-shaped. Referring to Figure 2 , the pushing assembly 33 includes an inner linear driver 331 and an avoiding driver 332, the avoiding driver 332 is fixedly arranged on the base 1, the inner linear driver 331 is installed on the output end of the avoiding driver 332, and the cantilever support 31 is fixedly arranged on the output end of the inner linear driver 331.

[0071] In combination with Figure 4 and Figure 6The outer contour positioning ring seat 22 and the inner contour positioning ring seat 32 are both provided with a plurality of mounting cavities 222. Figure 8 The roller assembly 4 includes a roller 41, a floating bearing seat 42, and a first bearing 43. The roller 41 is rotationally connected to the floating bearing seat 42 via the first bearing 43, and the inclination angle of the working surface of each roller 41 matches the curved surface of the protective cover. The floating bearing seat 42 is elastically connected to the mounting cavity 222 via a floating spring 422.

[0072] Combine Figure 4 and Figure 6 The outer contour positioning ring seat 22 and the inner contour positioning ring seat 32 are further provided with an outer ring seat cover 221 and an inner ring seat cover 322 respectively. The outer ring seat cover 221 and the inner ring seat cover 322 are both provided with an opening for exposing the roller 41. Figure 2 The outer welding gun 6 is fixed on the base 212 of the slide bracket 21, and the inner welding gun 7 is fixed on the cantilever bracket 31. The outer linear drive 23, the inner linear drive 331 and the avoidance drive 332 can be driven by a cylinder, an oil cylinder or an electric push rod.

[0073] Since welding slag may splash and adhere to the working surface of roller 41 or the curved surface of the shield workpiece 8, and roller 41 has a small diameter and poor throughput, when the attached slag passes through roller 41 during workpiece rotation, it may cause roller 41 to jam or become stuck. By elastically connecting floating bearing seat 42 to mounting cavity 222, floating bearing seat 42 can drive roller 41 to slide elastically along mounting cavity 222 when the attached slag passes through roller 41. On the one hand, roller 41 can roll over the slag, preventing it from being stuck due to rigid contact. On the other hand, it can adapt to slight deviations in the curved surface of the shield, providing a flexible clamping force and preventing deformation of the shield due to rigid contact. At the same time, the free rotation of roller 41 can reduce damage to the shield surface caused by friction during welding. The inclination of the working surface matches the curved surface of the shield workpiece 8, providing a uniform clamping force and preventing indentations or deformation of the thin-walled shield due to rigid clamping. The inner edge of the outer positioning ring seat 22 forms a clearance fit with the outer curved surface of the protective cover, while the outer edge of the inner positioning ring seat 32 matches the inner curved surface of the protective cover, ensuring the precise positioning of the protective cover workpiece 8 during clamping and the coaxiality of the drive shaft and the protective cover. The avoidance opening 321 on the inner positioning ring seat 32 provides operating space for the inner welding gun 7, ensuring that the inner welding gun 7 can be accurately aligned with the weld seam; the sliding connection between the slide bracket 21 and the guide rail 11 enables the outer clamp 2 to move axially, and the propulsion assembly 33 enables the inner clamp 3 to be propulsed axially and to avoid sideways, facilitating the loading and unloading of workpieces and adjusting the welding position.

[0074] When clamping the workpiece, after one end of the transmission shaft workpiece 9 is inserted into the transmission shaft chuck 12, the other end may deviate from the axis. Figure 5 and Figure 9 The inner clamp 3 also includes a locking mandrel 34, which includes a mandrel body 341 and a pneumatic drive unit. The mandrel body 341 is coaxially arranged with the inner contour positioning ring seat 32. The tail end of the mandrel body 341 is rotatably matched with the cantilever bracket 31, and its front end extends out of the inner ring of the inner contour positioning ring seat 32. Figure 9 The core shaft body 341 has a hollow cavity 3411 within it, which is connected to an external air source via a pipe. A locking bolt hole (not shown) is provided through the sidewall of the hollow cavity 3411. The pneumatic drive unit includes a drive piston 3412, a radial locking bolt 3413, and a return spring 3414. The drive piston 3412 is disposed within the hollow cavity 3411. The radial locking bolt 3413 is slidably fitted within the locking bolt hole. The bottom of the radial locking bolt 3413 has an inclined surface. The two ends of the return spring 3414 are respectively connected to the radial locking bolt 3413 and the sidewall of the core shaft body 341, providing an elastic force for the radial locking bolt 3413 to automatically retract.

[0075] When the inner clamp 3 and the outer clamp 2 clamp the workpiece, the front end of the locking mandrel 34 is inserted into the inner hole of the transmission shaft workpiece 9. When the external air source is ventilated to the hollow cavity 3411, under the action of air pressure, the front end of the driving piston 3412 pushes the radial locking tongue 3413 along the inclined structure of the radial locking tongue 3413, so that it extends radially along the locking tongue hole. The top surface of the radial locking tongue 3413 engages with the inner hole wall of the transmission shaft workpiece 9, and the locking mandrel 34 can rotate with the transmission shaft workpiece 9. By providing the locking mandrel 34, the front end of the locking mandrel 34 is inserted into the inner hole of the transmission shaft during clamping, and the radial locking tongue 3413 is driven by air pressure to extend and engage with the inner hole of the transmission shaft workpiece 9. In cooperation with the transmission shaft chuck 12, the coaxial locking of the two ends of the transmission shaft workpiece 9 is achieved, further improving the coaxiality between the workpieces and ensuring welding accuracy. The pneumatic drive unit can realize the automatic extension and retraction of the radial locking tongue 3413, which is convenient for loading and unloading the transmission shaft workpiece 9 and improves the convenience of operation.

[0076] Since the floating bearing seat 42 is elastically connected to the mounting cavity 222, the impact generated during welding, such as the impact of the shielding gas flow and the vibration during rotation, will cause the shield workpiece 8 to jump in the early stage of welding, thereby affecting the quality of the entire welding process. Figure 4 and Figure 6Both the outer clamp 2 and the inner clamp 3 are equipped with a roller locking assembly, which includes a locking ring seat, a locking piston rod 52, a locking spring 53, an air pressure distribution ring, and a spring spring 57. The outer clamp's locking ring seat 58 is coaxially fixedly connected to the outer positioning ring seat 22, while the inner clamp's locking ring seat 51 is coaxially fixedly connected to the inner positioning ring seat 32. Multiple piston cavities 511 are spaced apart within the outer and inner clamp's locking ring seats 58 and 51, respectively. These piston cavities 511 correspond one-to-one with the floating bearing seat 42. Each piston cavity 511 is equipped with a driving air hole 512 and an opening. The driving air hole 512 is located on the inner annular surface of the locking ring seat, and the opening of the piston cavity 511 is aligned with the corresponding floating bearing seat 42. Each locking piston rod 52 and locking spring 53 is slidably assembled within each piston cavity 511, with the output end of the locking piston rod 52 located within the opening. The two ends of the locking spring 53 are respectively connected to the bottom of the locking piston rod 52 and the bottom wall of the piston cavity 511 to push the locking piston rod 52 out of the piston cavity 511. Figure 7 and Figure 10 The air pressure distribution ring 54 / 55 is nested within the inner surface of the locking ring seat 58 / 51 and rotates in engagement. A vent groove 56 is provided on the outer surface of the air pressure distribution ring. The initial position of the vent groove 56 corresponds to the initial weld point position, and its trajectory as the air pressure distribution ring 54 / 55 rotates corresponds to the position of each drive air hole 512. A spring 57 is used to drive the air pressure distribution ring to reset and rotate. The spring 57 on the outer fixture is connected to the air pressure distribution ring 54 of the outer fixture, while the spring 57 on the inner fixture is connected to the air pressure distribution ring 55 of the inner fixture.

[0077] See also Figure 7 The air pressure distribution ring 54 of the outer clamp is rotatably connected to the air pressure supply ring 24 through the second bearing 542. The outer ring surface of the air pressure distribution ring 54 of the outer clamp is provided with an air supply ring groove 541. The air supply ring groove 541 is circumferentially connected along the outer ring surface. The air supply ring groove 541 is located on one side of the ventilation groove 56 and is connected to the ventilation groove 56 through a channel. The position of the air supply ring groove 541 corresponds to the outlet position of the air supply hole 241. Figure 9 and Figure 10 The air pressure distribution ring 55 of the inner clamp is fixedly sleeved on the core shaft body 341 and is rotatably connected to the inner contour positioning ring seat 32 through the third bearing 551. The ventilation groove 56 on the air pressure distribution ring 55 of the inner clamp passes through the ring body and is connected to the hollow cavity 3411 of the core shaft body 341.

[0078] Combine Figure 4 and Figure 7 The outer clamp 2 further includes an air pressure supply ring 24 and a top pressure follower assembly. The air pressure supply ring 24 is nested in the inner ring 211 of the slide bracket 21. Figure 7The air pressure supply ring 24 is provided with an air supply hole 241 extending therethrough. The inlet of the air supply hole 241 is located on the outer annular surface of the air pressure supply ring 24 and is connected to an external air source. The outlet of the air supply hole 241 is located on the inner annular surface of the air pressure supply ring 24 and corresponds to the position of the air supply ring groove 541. The top pressure follower assembly includes a top pressure block 242 and a top pressure hole (not shown in the figure). The top pressure hole is provided at one end of the air pressure distribution ring 54 of the outer fixture close to the roller assembly 4. The top pressure block 242 is in sliding engagement with the top pressure hole. A top pressure spring is provided in the top pressure hole. The two ends of the top pressure spring are respectively connected to the bottom of the top pressure block 242 and the bottom wall of the top pressure hole. The top surface contour of the top pressure block 242 is adapted to the outer curved surface of the protective cover workpiece 8.

[0079] Initially, each locking piston rod 52 presses against the corresponding floating bearing seat 42 under the action of the locking spring 53, so that each floating bearing seat 42 remains locked and cannot move at the beginning. When the outer clamp 2 and the inner clamp 3 clamp the workpiece, the locking core shaft 34 extends into the inner hole of the transmission shaft workpiece 9 to engage and lock it. The protective cover workpiece 8 is pushed by the inner clamp 3 to press against the pressing block 242. When the transmission shaft workpiece 9 drives the protective cover workpiece 8 to rotate, the transmission shaft workpiece 9 drives the air pressure distribution ring 55 of the inner clamp to rotate together through the locking core shaft 34. The protective cover workpiece 8 drives the air pressure distribution ring 54 of the outer clamp to rotate together through the friction between the pressing block 242. Figure 7 When the external air source vents to the air supply hole 241 of the air pressure supply ring 24, the air flows through the air supply hole 241 into the air supply ring groove 541, and then enters the vent groove 56 through the channel. When the air pressure distribution ring 54 of the outer clamp rotates, its vent groove 56 will pass through the driving air holes 512 of each piston cavity 511 in sequence. As the vent groove 56 passes through each driving air hole 512, the air flows through the driving air hole 512 into each piston cavity 511, thereby pushing the locking piston rod 52 back into the piston cavity 511, so that each floating bearing seat 42 is unlocked in sequence as the rotation proceeds. Similarly, see Figure 10 When the air pressure distribution ring 55 of the inner clamp rotates, the air flow enters each piston cavity 511 from the hollow cavity 3411 through the ventilation groove 56 in sequence, so that each floating bearing seat 42 is gradually unlocked in sequence as the rotation proceeds.

[0080] Each locking piston rod 52 initially presses against the corresponding floating bearing seat 42 under the action of the locking spring 53, so that each floating bearing seat 42 remains locked and cannot move at the beginning, thereby preventing the protective cover workpiece 8 from jumping in the initial stage of welding and keeping it stable. Because welding slag is primarily concentrated around the weld point, and during welding, the welding gun and fixture remain stationary while the workpiece rotates, welding slag attached to the shield workpiece 8 passes through each roller 41 in sequence as the workpiece rotates. By causing the air pressure distribution ring to rotate synchronously with the shield workpiece 8 and cooperating with the vent grooves 56 and drive holes 512, air pressure only retracts the corresponding locking piston rod 52 when the vent grooves 56 pass through the corresponding drive hole 512, thereby unlocking the corresponding floating bearing seat 42. This precisely controls the locking state of each roller 41, ensuring initial stable clamping and preventing the floating bearing seat 42 from slipping and affecting clamping stability. However, when welding slag passes through the corresponding roller 41, the roller 41 is promptly unlocked, allowing the roller 41 to roll over the welding slag and avoid jamming. As welding progresses, the weld fixation between the shield workpiece 8 and the drive shaft workpiece 9 is strengthened. Therefore, even if more floating bearing seats 42 are unlocked later, it will not affect the subsequent welding quality. After welding is completed, the external air source stops ventilation. At this time, the clockwork spring 57 drives the air pressure distribution ring to reset. During the reset rotation process, the air pressure in each piston chamber 511 is released in turn through the ventilation groove 56, so that each locking piston rod 52 is reset and extended under the action of the locking spring 53 to abut against the floating bearing seat 42, so that each floating bearing seat 42 is locked again.

[0081] See also Figure 8 A blade cavity 421 is provided inside the floating bearing seat 42, and a driving blade 411 is provided at the end of the roller shaft of the roller 41. The driving blade 411 is located in the blade cavity 421. The blade cavity 421 is provided with two blade air holes 423, one of which is connected to an external air source and aligned with the driving blade 411, so that the external air source can be ejected through the blade air hole 423 to drive the roller 41 to rotate, and the other blade air hole 423 is connected to the outside world.

[0082] See also Figure 7 The outer fixture's rotating airflow ring 412 is sleeved on the outer fixture's locking ring seat 58. Its interior is hollow and connected to the external air source. One of the blade air holes 423 on each floating bearing seat 42 on the outer fixture 2 is connected to the outer fixture's rotating airflow ring 412 through a pipeline. Figure 10 The driving airflow ring 413 of the inner fixture is sleeved on the locking ring seat 58 of the outer fixture, and its connection method is the same as that of the driving airflow ring 412 of the outer fixture.

[0083] An external air source drives blade 411 through blade cavity 421, driving roller 41 to automatically rotate. This reduces friction between the rotating shield and roller 41, allowing smoother rotation of the shielded workpiece 8 during welding. This, combined with the integrated rotation drive mechanism, ensures a uniform and stable welding trajectory. The active rotation of roller 41 also prevents sliding friction between the shielded workpiece 8 and roller 41, reducing frictional heat and surface wear, thereby protecting the surface quality of the shielded workpiece 8.

[0084] Combine Figure 8 and Figure 10 The roller assembly 4 also includes a slag scraper 44 and a collection pipe 45. The slag scraper 44 is fixedly mounted on the floating bearing seat 42 and is located on one side of the roller 41. Its blade contacts the working surface of the roller 41 to scrape off the slag attached thereto as the roller 41 rotates. The collection pipe 45 is connected to an external exhaust device. The suction port of the collection pipe 45 is close to the blade side of the slag scraper 44 to absorb the slag scraped off by the slag scraper 44. The slag scraper 44 is fixedly mounted on the floating bearing seat 42, and its blade contacts the working surface of the roller 41. The inner clamp 3 is provided with a welding slag collection ring 46. The welding slag collection ring 46 is hollow inside and communicates with the external exhaust device. The inner profile positioning ring seat 32 and the locking ring seat 51 of the inner clamp are both provided with channels that communicate with the collection pipes 45. The welding slag collection ring 46 is connected to the said channels one by one. During welding, the external exhaust device draws air into each collection pipe 45 of the inner clamp 3 through the welding slag collection ring 46. The outer profile positioning ring seat 22 and the locking ring seat 58 of the outer clamp are also provided with channels that communicate with the collection pipes 45 (not shown in the figure). Figure 7 The air pressure supply ring 24 is also provided with a hollow channel 243, which is connected to each of the aforementioned channels and to an external exhaust device. During welding, the external exhaust device draws air through the channel 243 to the various collection pipes 45 of the outer clamp 2. A slag scraper 44 automatically scrapes away adhered slag as the roller 41 rotates, preventing slag accumulation from affecting the roller 41's gripping accuracy and smooth rotation, and preventing residual slag from scratching or contaminating the protective cover surface. The collection pipes 45 promptly remove slag, preventing it from entering the weld seam or weld area, reducing weld defects (such as porosity and slag inclusions) caused by slag inclusions, and improving weld cleanliness and quality.

[0085] See also Figure 2 Both the outer welding gun 6 and the inner welding gun 7 are equipped with a slag suction pipe 71, which is connected to an external exhaust device. The suction nozzle of the slag suction pipe 71 is close to the weld point to absorb the welding slag. The suction nozzle of the slag suction pipe 71 is close to the weld point, and the external exhaust device is used to absorb some of the welding slag and smoke generated during the welding process in real time, keeping the welding area clean, improving the working environment, and ensuring the stability of the welding process.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. Laser welding equipment for food stick protective cover, characterized by: include: an abutment having a guide rail provided on its upper surface; The rotary drive mechanism includes a transmission shaft chuck and a drive motor, wherein the transmission shaft chuck is mounted on the upper surface of the base, and the drive motor is in transmission connection with the transmission shaft chuck; The clamping mechanism includes an outer clamp and an inner clamp, wherein the outer clamp is coaxially arranged with the transmission shaft chuck and is slidably connected with the guide rail, and a plurality of roller assemblies are uniformly distributed circumferentially on the outer clamp and the inner clamp; The welding mechanism includes an outer welding gun and an inner welding gun arranged in a staggered manner, wherein the outer welding gun is fixedly connected to the outer clamp and is located on the outer curved surface side of the protective cover workpiece, and the inner welding gun is fixedly connected to the inner clamp and is located on the inner curved surface side of the protective cover workpiece; When loading, the inner clamp is pushed toward the outer clamp so that the inner clamp and the outer clamp cooperate to clamp the workpiece of the protective cover; During welding, the outer welding gun and the inner welding gun first spot weld their respective welding points to preliminarily position and fix the transmission shaft workpiece and the protective cover workpiece. Then, the driving motor drives the transmission shaft chuck to rotate, so that the transmission shaft workpiece drives the protective cover workpiece to rotate. During the rotation process, the outer welding gun and the inner welding gun perform synchronous double-sided welding. Outboard clamps include: The slide bracket has a base that is slidably connected to the guide rail, an inner ring for the transmission shaft workpiece to pass through is provided on its upper portion, and an outer welding gun is fixed on its base; The outer contour positioning ring seat is coaxially mounted on the inner ring of the slide bracket, and its inner edge contour forms a clearance fit with the outer curved surface of the protective cover workpiece; An external linear drive is fixedly mounted on the base, and an output end thereof is fixedly connected to the base of the slide bracket; The inner clamp includes: Cantilever bracket, the inner welding gun is fixed on the cantilever bracket; The inner contour positioning ring seat is installed at the front end of the cantilever bracket, and its outer edge contour is adapted to the inner curved surface of the protective cover workpiece and is provided with an avoidance opening for avoiding the inner welding gun; The propulsion assembly includes an inner linear drive and an avoidance drive, wherein the avoidance drive is fixed on the base, the inner linear drive is installed on the output end of the avoidance drive, and the cantilever bracket is fixed on the output end of the inner linear drive; Wherein, a plurality of installation cavities are provided inside the outer contour positioning ring seat and the inner contour positioning ring seat; The roller assembly includes: Rollers, the inclination angle of the working surface of each roller is adapted to the curved surface of the protective cover; A floating bearing seat elastically connected to the mounting cavity; The first bearing is used to realize the rotational connection between the roller and the floating bearing seat.

2. The laser welding device for a food processor protective cover according to claim 1, wherein: The inner clamp also includes a locking mandrel, which includes: The core shaft body is coaxially arranged with the inner contour positioning ring seat, the tail end of which is rotatably connected to the cantilever bracket, and the front end of which extends out of the inner ring of the inner contour positioning ring seat. A hollow cavity is provided inside the core shaft body, and the hollow cavity is connected to the external air source. A lock bolt hole is provided on the side wall of the hollow cavity; The pneumatic drive unit includes a drive piston, a radial lock tongue, and a return spring. The drive piston is disposed in the hollow cavity. The radial lock tongue is disposed in a sliding engagement with the lock tongue hole. The bottom of the radial lock tongue is provided with an inclined surface structure. The two ends of the return spring are respectively connected to the radial lock tongue and the side wall of the core shaft body to provide an elastic force for the radial lock tongue to automatically retract. The front end of the locking mandrel is inserted into the inner hole of the transmission shaft workpiece. Under the action of air pressure, the radial locking tongue extends out and engages with the inner hole of the transmission shaft workpiece.

3. The laser welding device for a food processor protective cover according to claim 2, wherein: Both the outer and inner clamps are equipped with roller locking assemblies, which include: The locking ring seat has multiple piston cavities spaced apart inside, and the piston cavities correspond one-to-one with the floating bearing seats. The piston cavities are provided with drive holes and openings. The drive holes are located on the inner ring surface of the locking ring seat, and the openings of the piston cavities are aligned with the corresponding floating bearing seats. The locking ring seats on the outer and inner clamps are coaxially stacked on the bottom ends of the outer and inner positioning ring seats, respectively. A plurality of locking piston rods are provided, each locking piston rod is slidably assembled in each piston cavity, and the output end of the locking piston rod is located in the opening; A locking spring, which is provided in plurality and is disposed one by one in the piston cavity, with two ends of the locking spring respectively connected to the bottom of the locking piston rod and the bottom wall of the piston cavity to push the locking piston rod out of the piston cavity; An air pressure distribution ring is nested in the inner ring surface of the locking ring seat and rotated together. A ventilation groove is provided on the outer ring surface of the air pressure distribution ring. The movement trajectory of the ventilation groove corresponds to the position of each driving air hole. The air pressure distribution ring of the outer clamp has an air supply ring groove on its outer ring surface. The air supply ring groove is connected to the ventilation groove. The air pressure distribution ring of the inner clamp is fixedly sleeved with the core shaft body, and its ventilation groove is connected to the hollow cavity of the core shaft body. A clockwork spring is used to drive the air pressure distribution ring to reset and rotate; The outboard fixture also includes: An air pressure supply ring is nested in the inner ring of the slide bracket and is provided with an air supply hole therethrough. The inlet of the air supply hole is located on the outer ring surface of the air pressure supply ring and is connected to an external air source. The outlet of the air supply hole is located on the inner ring surface of the air pressure supply ring and corresponds to the position of the air supply ring groove. The top pressure follower assembly includes a top pressure block and a top pressure hole. The top pressure hole is arranged at one end of the air pressure distribution ring of the outer clamp close to the roller assembly. The top pressure block and the top pressure hole are slidably matched. A top pressure spring is provided in the top pressure hole. The two ends of the top pressure spring are respectively connected to the bottom of the top pressure block and the bottom wall of the top pressure hole. The top surface contour of the top pressure block is adapted to the outer curved surface of the protective cover workpiece.

4. The laser welding device for a food processor protective cover according to claim 1, wherein: A blade cavity is provided inside the floating bearing seat, and a driving blade is provided at the end of the roller shaft of the roller. The driving blade is located in the blade cavity. The blade cavity is provided with two blade air holes, one of which is connected to an external air source and aligned with the driving blade, so that the external air source can eject air through the blade air hole to drive the roller to rotate.

5. The laser welding device for a food processor protective cover according to claim 1, wherein: The roller assembly also includes a welding slag scraper and a collection pipe. The welding slag scraper is fixedly mounted on the floating bearing seat and is located on one side of the roller. Its blade contacts the working surface of the roller to scrape off the welding slag attached to it when the roller rotates. The collection pipe is connected to an external exhaust device. The adsorption port of the collection pipe is close to the blade side of the welding slag scraper to adsorb the welding slag scraped off by the welding slag scraper.

6. The laser welding device for a food processor protective cover according to claim 1, wherein: Both the outer welding gun and the inner welding gun are provided with welding slag adsorption pipes, which are connected to the external exhaust device. The suction nozzles of the welding slag adsorption pipes are close to the welding points to absorb the welding slag generated during welding.

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