A plastic frame sealing and welding device for a vehicle-mounted air conditioner filter element and a welding process

Abstract

This invention discloses a sealing and welding device and process for plastic frames of automotive air conditioning filters, relating to the field of air conditioning filter production technology. It includes a workbench, a gantry frame, and a welding actuator, as well as a guide assembly and multiple clamping assemblies. The guide assembly includes a base frame and a guide rail. A groove is formed on the inner side of the guide rail, and multiple elastic plates are installed along the entire circumference of the outer wall of the guide rail. Each elastic plate has its two ends fixed and its middle section suspended. An electric actuator is provided on the inner side of the base frame corresponding to each elastic plate, with the push rod of each electric actuator abutting against the middle section of the corresponding elastic plate. Multiple clamping assemblies are provided, each including a slider clamped in the groove, with a servo electric cylinder fixed on the slider. Through the coordinated operation of the guide assembly and clamping assemblies, the invention improves upon the problems of fixed guide rail support rigidity, suspended clamping of rounded corner sections, and slider locking leading to overflow contamination of the filter paper in existing welding devices, thereby enhancing the sealing accuracy and production stability of the filter frame.

Description

Technical Field

[0001] This invention relates to the field of air conditioning filter manufacturing technology, specifically to a sealing and welding device and welding process for the plastic frame of an automotive air conditioning filter. Background Technology

[0002] The plastic frame sealing and welding device for vehicle air conditioning filters is the core execution unit for splicing and sealing plastic frames in the production of air conditioning filters. It is a key component that determines the sealing accuracy of the filter frame, the product qualification rate, production efficiency and the stability of mass production.

[0003] Existing automotive air conditioning filter plastic frame sealing and welding devices mostly adopt a technical approach of rigid fixed guide rails, single-sided single-point clamping, and no dedicated overflow control. During operation, the clamping unit is arranged along the guide rail, and the frame is positioned by rigid clamping. The plastic frame is sealed by the welding actuator. Under continuous mass production, filter specification switching, and high-frequency welding conditions, the operational stability and molding consistency are limited. First, the rigid guide rail has a fixed support stiffness, which is difficult to adapt to the tolerance differences of the filter frame. In mass production, the filter positioning deviation is relatively large. Under high-frequency welding vibration, the clamping unit is prone to loosening, causing frame warping and weld misalignment. The linear slider cannot be adapted to the rounded corners of the guide rail, causing the filter element to be suspended at the four corners, further aggravating the problem of poor sealing. Secondly, the clamping units are mostly rigid hard contacts without flexible buffer structures, making it impossible to accurately control the clamping force. This can easily lead to overpressure cracking of the frame or insufficient clamping causing displacement. At the same time, there is no dedicated filter paper protection structure, which can easily puncture or crush the filter paper or cause it to curl up during clamping. In addition, there is no effective overflow blocking structure during welding. The molten plastic frame can easily seep into the filter paper, causing the filter element to be scrapped. The burrs formed on the outside also require manual secondary cleaning, which increases production costs and affects production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing and welding device and welding process for plastic frames of vehicle air conditioning filters, so as to solve the problems of clamping wobbling and missing rounded corner clamping, welding overflow contamination and frame warping and deformation, slider locking interference and lack of flexible buffering, as well as the problems of uncontrolled clamping force and filter paper damage under pressure mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a sealing and welding device for plastic frames of vehicle air conditioning filters, including a worktable, a gantry frame, and a welding actuator; it also includes... A guide assembly includes a base frame and a guide rail. A groove is provided on the inner side of the guide rail. Multiple elastic plates are installed around the outer wall of the guide rail. The two ends of each elastic plate are fixed and the middle section is suspended. An electric actuator is provided on the inner side of the base frame corresponding to each elastic plate. The push rod of each electric actuator abuts against the middle section of the corresponding elastic plate. Multiple clamping assemblies are provided. Each clamping assembly includes a slider that is clamped in a slide groove. A servo electric cylinder is fixed on the slider. A buffer assembly and a tension / compression sensor are connected in series at the front end of the push rod of the servo electric cylinder. A composite clamping end is connected to the front end of the tension / compression sensor. Anti-deflection guides are installed on both sides of the slider. The composite clamping end includes a rigid block for clamping the frame. An L-shaped overflow baffle is integrally formed on the top of the rigid block. An elastic pressure finger is hinged to the front end of the overflow baffle.

[0006] Preferably, the guide rail is symmetrically spliced ​​from left and right halves, including four straight edge segments and four rounded corner segments. The top of the guide rail is provided with an intermittent locking groove. The inner wall of the base frame is provided with multiple blind mounting holes, and multiple electric actuators are embedded in the multiple blind mounting holes. The multiple elastic plates are divided into straight edge segments and rounded corner segments. The number of multiple electric actuators is equal to the number of multiple elastic plates, and they are evenly distributed around the entire circumference of the base frame.

[0007] Preferably, the clamping assembly further includes a locking bolt and a mounting bracket. The top of the slider has a vertically penetrating threaded hole. The locking bolt passes vertically through the intermittent locking groove on the top of the guide rail and is screwed into the threaded hole of the slider. The bottom end of the locking bolt presses against the inner bottom surface of the sliding groove. The slider is divided into a straight-edge sliding slider and a rounded-corner fixed slider. The outer wall shapes of the straight-edge sliding slider and the rounded-corner fixed slider are respectively adapted to the straight-edge section and the rounded-corner section of the guide rail. The mounting bracket is fixed to one side of the slider. The top of the mounting bracket is fixed with a mounting plate, and the mounting plate is fixedly connected to the servo electric cylinder.

[0008] Preferably, the buffer assembly includes a transition flange, a guide sleeve, a hydraulic damper, a gradient stiffness spring assembly, multiple limiting plates, a movable push rod, and a limiting sleeve. The transition flange connects the push rod of the servo electric cylinder to the rear end of the guide sleeve. The multiple limiting plates are fixed to the rear end of the inner wall of the guide sleeve. The hydraulic damper and the gradient stiffness spring assembly are arranged in parallel inside the guide sleeve. The movable push rod passes through the guide sleeve, and its rear end abuts against the hydraulic damper and the gradient stiffness spring assembly. The limiting sleeve is fixed to the front end of the inner wall of the guide sleeve and limits the extension length of the movable push rod.

[0009] Preferably, the anti-deflection guide includes a plurality of first ear seats, a plurality of linear bearings and a plurality of guide shafts. The plurality of first ear seats are symmetrically fixed to the top of the mounting bracket. Each linear bearing is installed in a corresponding first ear seat. Each guide shaft passes through the corresponding linear bearing and its front end is fixed to the back of the rigid block.

[0010] Preferably, the front of the rigid block is provided with a micro-serrated surface, and the back of the rigid block is fixedly connected to the tension and compression sensor. A silicone pad is attached to the micro-serrated surface, and the lower surface of the horizontal section of the L-shaped overflow baffle is provided with a baffle rib. A baffle brush is attached to one side of the baffle rib.

[0011] Preferably, the composite clamping end further includes multiple second ear seats, a pin, and a miniature torsion spring. The multiple second ear seats are integrally formed on the upper edge of the front end of the horizontal section of the overflow baffle. The pin passes through the inner wall of the multiple second ear seats and the elastic pressure finger. The miniature torsion spring is sleeved on the pin. The fixing arm of the miniature torsion spring is engaged with the second ear seat, and the driving arm of the miniature torsion spring abuts against the elastic pressure finger.

[0012] Preferably, the front end of the elastic pressure finger is provided with a plurality of silicone bumps on the side facing the filter paper, and the plurality of silicone bumps are evenly distributed.

[0013] Preferably, the welding actuator is fixed to the inside of the gantry and located above the guide assembly and clamping assembly. The tension and compression sensor is a spoke-type sensor. The servo electric cylinder has a built-in position encoder, which, together with the tension and compression sensor, is connected to the controller to form a closed-loop force control.

[0014] This invention also provides a sealing and welding process for the plastic frame of an automotive air conditioning filter, comprising the following steps: Step 1: Fix the base frame to the workbench, splice and fix the guide rail to the inside of the base frame, install multiple elastic plates in the mounting grooves on the outer wall of the guide rail, so that the two ends of each elastic plate are fixed and the middle section is suspended, and embed multiple electric actuators into the mounting blind holes on the inside of the base frame, so that the push rod of each electric actuator abuts against the middle section of the corresponding elastic plate. Step 2: Install the sliders of multiple clamping components into the slide grooves inside the guide rail. According to the size of the filter element frame, slide the slider corresponding to the straight edge section to the preset position. Insert the locking bolt vertically into the intermittent locking groove and tighten it so that the bottom end of the locking bolt presses against the bottom surface of the slide groove, and directly lock and fix the slider corresponding to the rounded corner section. Step 3: Place the filter element horizontally in the center of the workbench, with the plastic frame to be welded facing upwards and located within the enclosed area of ​​multiple clamping components. Activate the electric actuator and adjust the extension amount of the electric actuator according to the wall thickness difference in different areas of the filter element frame, so that the corresponding elastic sheet produces different degrees of elastic deformation, thereby changing the local support stiffness of the guide rail. Step 4: Start the servo electric cylinder. Its push rod pushes the composite clamping end horizontally towards the filter element through the buffer assembly and the tension and pressure sensor. The gradient stiffness spring group and hydraulic damper in the buffer assembly adaptively compensate for the contour tolerance of the frame. The tension and pressure sensor feeds back the clamping force to the controller in real time. When the clamping force reaches the preset value, the servo electric cylinder stops feeding. At this time, the micro-serrated surface on the front of the rigid block clamps the plastic frame with the silicone pad. The elastic pressure finger gently presses the filter paper surface through the silicone protrusion under the action of the micro torsion spring. Step 5: Start the welding actuator fixed inside the gantry frame to seal and weld the plastic frame of the filter element. During the welding process, the baffle ribs and baffle brushes prevent the molten plastic from flowing to the filter paper. The guide shaft and linear bearing in the anti-deflection guide suppress radial sway of the composite clamping end. Step Six: After welding is completed, the push rod of the servo electric cylinder returns to its initial position, the electric actuator resets, the locking bolt is loosened, and the welded filter element is removed from the worktable.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the coordinated operation of the guide assembly and the clamping assembly improves upon the problems of fixed guide rail support stiffness, suspended clamping at rounded corners, and interference with filter paper during slider locking in existing welding devices, thereby enhancing the sealing accuracy and production stability of the filter element frame. In the guide assembly, a groove is formed on the inner side of the guide rail, with the elastic sheet fixed at both ends to the groove wall and suspended in the middle. An electric actuator within the base frame passes through the outer groove of the guide rail and presses against the middle section of the elastic sheet, achieving active zoned adjustment of the guide rail support stiffness. A locking bolt at the top of the slider vertically presses against the bottom of the groove from the intermittent locking groove, resolving the issues of suspended clamping at the four corners and lateral interference. In the clamping assembly, a gradient stiffness spring group and hydraulic damping... The device is connected in parallel within the guide sleeve, forming a passive adaptive buffer with the movable push rod and the limiting sleeve. The tension and pressure sensors provide real-time feedback on the clamping force, preventing the filter paper from being crushed and the frame from being deformed due to excessive pressure. The overflow baffle's baffle ribs and baffle brushes prevent molten plastic from flowing to the filter paper. The micro-serrated surface on the front of the rigid block and the silicone pad clamp the frame. The elastic pressure finger is hinged to the second ear seat via a micro torsion spring and a pin. The silicone protrusion at the front end lightly presses the filter paper, reducing edge warping and damage. The first ear seat fixes the linear bearing. The front end of the guide shaft is connected to the rigid block, forming a three-point support with the servo electric cylinder, suppressing the sway of the clamping end, extending the service life of the equipment, and improving welding consistency and frame sealing quality. Attached Figure Description

[0016] Figure 1 This is a perspective view of the main structure in this invention; Figure 2 This is a perspective view of the side structure in this invention; Figure 3 This is a schematic diagram showing the installation position of the guide assembly and the clamping assembly in this invention; Figure 4This is a schematic diagram of the installation position structure of the guide component in this invention; Figure 5 This is a schematic diagram of the installation positions of the guide rail, slide rail, and intermittent locking groove in this invention; Figure 6 for Figure 5 Enlarged 3D view at point A in the middle; Figure 7 This is a schematic diagram of the installation position structure of the clamping component in this invention; Figure 8 This is a schematic diagram showing the installation positions of the guide sleeve, hydraulic damper, and gradient stiffness spring assembly in this invention. Figure 9 This is a schematic diagram showing the installation positions of the rigid block, the micro-serrated surface, and the silicone pad in this invention. Figure 10 for Figure 9 Enlarged 3D view at point B; Figure 11 for Figure 9 Enlarged 3D view at point C.

[0017] In the diagram: 100, worktable; 200, gantry frame; 300, welding actuator; 400, guide assembly; 401, base frame; 402, mounting blind hole; 403, guide rail; 404, slide rail; 405, intermittent locking groove; 406, elastic plate; 407, electric actuator; 500, clamping assembly; 501, slider; 502, locking bolt; 503, mounting bracket; 504, mounting plate; 505, servo electric cylinder; 506, transition flange; 507, guide sleeve; 508, hydraulic system. 509. Damper; 510. Gradient stiffness spring assembly; 511. Limiting plate; 512. Movable push rod; 513. Limiting sleeve; 514. Tension / compression sensor; 515. First ear seat; 516. Linear bearing; 517. Guide shaft; 518. Rigid block; 519. Micro-serrated surface; 520. Silicone pad; 521. Overflow baffle; 522. Material blocking rib; 523. Material blocking brush; 524. Second ear seat; 525. Pin; 526. Miniature torsion spring; 527. Elastic pressure finger; 528. Silicone protrusion. Detailed Implementation

[0018] 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.

[0019] like Figures 1-2As shown, this embodiment provides a sealing and welding device for the plastic frame of an automotive air conditioning filter. The whole machine uses a workbench 100 as the bottom support carrier. A gantry frame 200 is fixedly mounted across the upper area of ​​the workbench 100 to provide a stable installation base for the welding execution components. The welding execution mechanism 300 is assembled in the inner working position of the gantry frame 200 and can perform sealing and welding operations on the plastic frame of the filter. The guide component 400 is fixedly set above the workbench 100 and within the enclosed space of the gantry frame 200. Multiple sets of clamping components 500 are evenly arranged along the circumference of the guide component 400, which can perform circumferential flexible clamping and positioning of the filter frame to ensure the stability of the filter position during the welding process.

[0020] like Figures 3-4 As shown, the guide assembly 400 serves as the foundation for guiding and adjusting the rigidity of the entire machine. It mainly consists of a base frame 401 and a guide rail 403. The base frame 401 is fixed to the upper surface of the worktable 100, providing a rigid mounting carrier for the guide rail 403 and the adjustment components. A circumferential groove 404 is provided on the inner side of the guide rail 403 to provide a sliding and assembly channel for the clamping assembly 500. Multiple sets of elastic plates 406 are arranged around the outer wall of the guide rail 403. Both ends of each set of elastic plates 406 are fixed in the mounting groove on the outer wall of the guide rail 403, while the middle section remains suspended, allowing for elastic deformation under external force. An electric actuator 407 is provided on the inner side of the base frame 401 corresponding to each set of elastic plates 406. The top of the electric actuator 407... The end of the rod abuts against the suspended section of the corresponding elastic plate 406. When the push rod of the electric actuator 407 extends, the elastic plate 406 is pressed and tends to be straight, eliminating the gap between the elastic plate 406 and the bottom of the mounting groove on the outer wall of the guide rail 403. The elastic plate 406 generates an outward tension on the outer wall of the guide rail 403, which causes the cross section of the guide rail 403 to undergo a slight bending deformation. The two side walls of the slide groove 404 move closer to the middle, thereby increasing the radial constraint stiffness of the slider 501. When the push rod of the electric actuator 407 retracts, the elastic plate 406 returns to its suspended bending state, the tension disappears, the cross section of the guide rail 403 rebounds, and the constraint stiffness of the slide groove 404 on the slider 501 decreases, thereby realizing the active zonal adjustment of the local support stiffness of the guide rail 403.

[0021] like Figures 7-9As shown, multiple sets of clamping components 500 are arranged circumferentially along the guide rail 403 to form an enclosed clamping structure. Each set of clamping components 500 includes a slider 501, which is fitted into a groove 404 in the guide rail 403 and slides along the groove 404. A servo electric cylinder 505 is fixedly mounted on the upper part of the slider 501 to provide linear power for the clamping action. The front end of the push rod of the servo electric cylinder 505 is connected in sequence to a buffer component and a tension / compression sensor 513. The buffer component can absorb clamping impact and adapt to the frame contour tolerance. Force sensor 513 can collect clamping force data in real time. The front end of tension and compression sensor 513 is connected to composite clamping end. Anti-deflection guides are arranged on both sides of slider 501 to limit the radial sway of clamping end. Composite clamping end includes rigid block 517. Rigid block 517 can directly contact the plastic frame of filter element and apply clamping force. The top of rigid block 517 is integrally formed with L-shaped overflow baffle 520, which can block the welding molten material from flowing to filter paper. The front end of overflow baffle 520 is hinged with elastic pressure finger 526 to flexibly press the filter paper.

[0022] like Figures 4-5 As shown, the guide rail 403 adopts a symmetrical splicing structure of left and right halves, and the whole includes four straight edge segments and four rounded corner segments to adapt to the contour shape of the rectangular filter element. The top of the guide rail 403 has intermittent locking grooves 405 along the circumference to provide passage space for the locking component of the slider 501. The inner sidewall of the base frame 401 has multiple sets of mounting blind holes 402, and multiple sets of electric actuators 407 are respectively embedded in the corresponding mounting blind holes 402 to reduce the external space occupation. The elastic sheet 406 is divided into a straight edge segment flat sheet and a rounded corner segment arc-shaped sheet, which are adapted to the contours of the straight edge segment and the rounded corner segment of the guide rail 403, respectively. Figure 6 As shown, the number of electric actuators 407 is consistent with the number of elastic plates 406, and they are evenly distributed along the circumference of the base frame 401 to achieve uniform zoned adjustment of the support stiffness of the guide rail 403.

[0023] like Figure 3 and Figure 7As shown, the clamping assembly 500 also includes a locking bolt 502 and a mounting bracket 503. The top of the slider 501 has a vertically penetrating threaded hole. The locking bolt 502, after vertically penetrating the intermittent locking groove 405 at the top of the guide rail 403, is screwed into the threaded hole of the slider 501. The bottom end of the locking bolt 502 can press against the inner bottom surface of the slide groove 404, thus fixing the position of the slider 501 through friction. The slider 501 is divided into two types: a straight-edge sliding slider and a rounded-corner fixed slider. The bottom of the straight-edge sliding slider has a flat shape, which is clearance-fitted with the flat slide groove 404 of the straight edge section of the guide rail 403, allowing it to move freely along the slide groove 404. The bottom mounting plate of the sliding, rounded corner section fixed slider is arc-shaped, and its radius of curvature is the same as that of the rounded corner section slide groove 404 of the guide rail 403. The arc-shaped mounting plate and the slide groove 404 are locked with an interference fit or by a lateral set screw, so that it cannot slide along the arc direction and only serves as a fixed support point. The outer wall shape of the two types of sliders is adapted to the straight edge section and rounded corner section contour of the guide rail 403, respectively. The mounting bracket 503 is fixed to the side of the slider 501, and the top of the mounting bracket 503 is fixed with the mounting plate 504. The plate surface of the mounting plate 504 is fixedly connected to the cylinder body of the servo electric cylinder 505, providing stable installation support for the servo electric cylinder 505.

[0024] like Figures 7-8 As shown, the buffer assembly, as the core component of the flexible clamping mechanism, consists of a transition flange 506, a guide sleeve 507, a hydraulic damper 508, a gradient stiffness spring assembly 509, multiple sets of limiting plates 510, a movable push rod 511, and a limiting sleeve 512. One end of the transition flange 506 is connected to the push rod of the servo electric cylinder 505, and the other end is fixed to the rear end of the guide sleeve 507, transmitting power and connecting the various buffer components. The multiple sets of limiting plates 510 are fixed to the rear end of the inner wall of the guide sleeve 507, restricting the axial displacement of the internal components. The hydraulic damper 508 and the gradient stiffness spring assembly 509 are arranged in parallel inside the guide sleeve 507, which can jointly provide buffering and reduction. To improve vibration control, the movable push rod 511 passes through the guide sleeve 507, with its rear end face abutting against the hydraulic damper 508 and the gradient stiffness spring assembly 509. The limiting sleeve 512 is fixed to the front end of the inner wall of the guide sleeve 507, limiting the extension length of the movable push rod 511 and preventing the components from coming off. The initial length of the gradient stiffness spring assembly 509 is consistent with the initial length of the hydraulic damper 508, and the maximum compression stroke of both is less than the axial distance between the limiting sleeve 512 and the limiting plate 510, ensuring that the gradient stiffness spring assembly 509 and the hydraulic damper 508 compress and rebound synchronously during the reciprocating motion of the movable push rod 511, avoiding mutual interference.

[0025] like Figure 7As shown, the anti-deflection guide consists of multiple sets of first ear seats 514, multiple sets of linear bearings 515, and multiple sets of guide shafts 516. The multiple sets of first ear seats 514 are symmetrically fixed at the top of the mounting bracket 503. Each set of linear bearings 515 is respectively assembled inside the corresponding first ear seat 514 to maintain a stable guiding posture. Each set of guide shafts 516 passes through the inner hole of the corresponding linear bearing 515. The front end of the guide shaft 516 is fixedly connected to the rigid block 517 and moves synchronously with the clamping end, forming a multi-point support structure with the servo electric cylinder 505 to reduce the radial sway and shaking of the clamping end.

[0026] like Figures 9-10 As shown, the front of the rigid block 517 is machined with a micro-serrated surface 518 to increase the frictional force in contact with the plastic frame. The back of the rigid block 517 is fixedly connected to the tension and compression sensor 513, which can stably transmit the clamping force. The surface of the micro-serrated surface 518 is attached with a silicone pad 519 to buffer the pressure during clamping and prevent scratches on the frame surface. The lower surface of the horizontal section of the L-shaped overflow baffle 520 is provided with a baffle rib 521 to form the first molten material blocking structure. The baffle rib 522 is attached to the side of the baffle rib 521 to seal the tiny gaps and prevent the fine molten material from seeping into the filter paper area.

[0027] like Figure 9 and Figure 11 As shown, the composite clamping end also includes multiple sets of second ear seats 523, pins 524, and miniature torsion springs 525. The multiple sets of second ear seats 523 are integrally formed on the upper edge of the front end of the horizontal section of the overflow baffle 520. The pins 524 penetrate the inner walls of the multiple sets of second ear seats 523 and the elastic pressure finger 526, enabling the hinged rotation of the elastic pressure finger 526. The miniature torsion spring 525 is sleeved on the outside of the pins 524, and the fixing arm of the miniature torsion spring 525 is engaged with the second ear seats 523. Within the limiting structure of 3, the drive arm abuts against one side of the elastic pressure finger 526, which can apply a continuous slight pressing force to the elastic pressure finger 526 to make it adhere to the surface of the filter paper. When the filter element is placed horizontally, the upper surface of the plastic frame is the area to be welded. The horizontal section of the L-shaped overflow baffle 520 is located at the top of the rigid block 517. The baffle rib 521 and baffle brush 522 on its lower surface are directly opposite the joint gap between the frame and the filter paper, effectively preventing the molten plastic from flowing downward to the filter paper.

[0028] like Figure 11 As shown, multiple sets of silicone bumps 527 are arranged on the side of the elastic pressure finger 526 facing the filter paper. The multiple sets of silicone bumps 527 are evenly distributed to increase the contact area with the filter paper, disperse the holding pressure, reduce the possibility of filter paper damage and curling, and ensure the integrity of the filter paper structure.

[0029] like Figure 1As shown, the welding actuator 300 is fixed inside the gantry 200 and positioned above the guide assembly 400 and clamping assembly 500, enabling it to perform welding operations directly facing the weld seam of the filter element frame. Figure 8 The tension / compression sensor 513 adopts a spoke-type structure to stably acquire axial clamping force. The servo electric cylinder 505 integrates a position encoder, which can provide real-time feedback on the push rod stroke. Both the servo electric cylinder 505 and the tension / compression sensor 513 are electrically connected to an external controller to form a closed-loop control of clamping force, maintaining a stable output of clamping force. The tension / compression sensor 513 detects the clamping force in real time and converts it into an electrical signal, which is then transmitted to the controller. The controller compares the measured value with a preset threshold. If the measured value is lower than the threshold, the thrust of the servo electric cylinder 505 is increased; if it is higher than the threshold, the thrust is decreased, forming a negative feedback closed-loop adjustment to stabilize the clamping force within the set range.

[0030] During use, after the device is assembled and tested to a satisfactory standard, the sealing and welding of the plastic frame of the vehicle's air conditioning filter is immediately carried out. Figure 1 and Figure 3 First, fix the base frame 401 onto the workbench 100. Then, after splicing the guide rails 403, fix them to the inside of the base frame 401. Figure 4 Multiple sets of elastic plates 406 are installed into the mounting grooves on the outer wall of the guide rail 403, fixing both ends of the elastic plates 406 and suspending the middle section. Then, multiple sets of electric actuators 407 are embedded into the mounting blind holes 402 of the base frame 401, so that the push rods of the electric actuators 407 press against the corresponding middle section of the elastic plate 406; combined with Figure 7 Then, multiple sets of sliders 501 are inserted into the grooves 404 of the guide rail 403, and the straight-edge section sliders are slid to the set positions according to the filter element specifications, combined with... Figure 4 Tighten the locking bolt 502 through the intermittent locking groove 405, so that the bottom end of the bolt is pressed against the bottom surface of the sliding groove 404 to complete the fixation, and the rounded corner section slider is directly locked and positioned; place the filter element to be welded horizontally in the clamping and enclosing area in the center of the worktable 100, with the welding surface of the plastic frame facing upwards, start the electric actuator 407, and adjust the pushing stroke of the electric actuator 407 according to the wall thickness and tolerance of different areas of the filter element frame to change the degree of deformation of the elastic sheet 406 to adapt to the support stiffness requirements of the corresponding area; combined with Figure 7 Next, the servo electric cylinder 505 is activated, and the push rod, through the buffer assembly and the tension / compression sensor 513, pushes the composite clamping end towards the filter element, combining... Figure 8 The gradient stiffness spring assembly 509 and the hydraulic damper 508 work together to adaptively compensate for the deviation of the frame contour. The tension and compression sensor 513 transmits the clamping force data to the controller in real time. When the clamping force reaches the set value, the servo electric cylinder 505 stops feeding. Figure 9 and Figure 10At this time, the silicone pad 519 of the rigid block 517 adheres to and clamps the plastic frame, and the elastic pressure finger 526, under the action of the micro torsion spring 525, lightly presses the surface of the filter paper through the silicone protrusion 527; the welding actuator 300 on the gantry 200 is started to seal and weld the plastic frame of the filter element. During the welding process, the overflow baffle 520's baffle rib 521 and baffle brush 522 work together to block the molten plastic and prevent the material flow from seeping into the filter paper. The guide shaft 516 cooperates with the linear bearing 515 to suppress the radial wobble of the clamping end and ensure the welding position is accurate. After the welding operation is completed, the servo electric cylinder 505 push rod retracts to the initial position, the electric actuator 407 resets, the locking bolt 502 is loosened, and the welded filter element is removed from the worktable 100, thus completing a single welding operation.

Claims

1. A sealing and welding device for plastic frames of vehicle air conditioning filters, comprising a workbench (100), a gantry frame (200), and a welding actuator (300), characterized in that: Also includes A guide assembly (400) includes a base frame (401) and a guide rail (403). A groove (404) is provided on the inner side of the guide rail (403). Multiple elastic plates (406) are installed around the outer wall of the guide rail (403). Each elastic plate (406) is fixed at both ends and suspended in the middle. An electric actuator (407) is provided on the inner side of the base frame (401) corresponding to each elastic plate (406). The push rod of each electric actuator (407) abuts against the middle section of the corresponding elastic plate (406). Multiple clamping assemblies (500) are provided. Each clamping assembly (500) includes a slider (501) that is fitted into a slide groove (404). A servo electric cylinder (505) is fixed on the slider (501). A buffer assembly and a tension / compression sensor (513) are connected in series at the front end of the push rod of the servo electric cylinder (505). A composite clamping end is connected to the front end of the tension / compression sensor (513). Anti-deflection guides are installed on both sides of the slider (501). The composite clamping end includes a rigid block (517) for clamping the frame. An L-shaped overflow baffle (520) is integrally formed on the top of the rigid block (517). An elastic pressure finger (526) is hinged to the front end of the overflow baffle (520).

2. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The guide rail (403) is symmetrically spliced ​​from the left and right halves, including four straight edge segments and four rounded corner segments. The top of the guide rail (403) is provided with an intermittent locking groove (405). The inner wall of the base frame (401) is provided with multiple mounting blind holes (402), and multiple electric actuators (407) are embedded in multiple mounting blind holes (402). Multiple elastic pieces (406) are divided into straight edge segments and rounded corner segments. The number of multiple electric actuators (407) is equal to the number of multiple elastic pieces (406), and they are evenly distributed around the entire circumference of the base frame (401).

3. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The clamping assembly (500) also includes a locking bolt (502) and a mounting bracket (503). The top of the slider (501) has a vertically penetrating threaded hole. The locking bolt (502) is vertically inserted into the threaded hole of the slider (501) through the intermittent locking groove (405) at the top of the guide rail (403). The bottom end of the locking bolt (502) is pressed against the inner bottom surface of the slide groove (404). The slider (501) is divided into a straight-edge sliding slider and a rounded-corner fixed slider. The outer wall shape of the straight-edge sliding slider and the rounded-corner fixed slider are respectively adapted to the straight-edge section and the rounded-corner section of the guide rail (403). The mounting bracket (503) is fixed to one side of the slider (501). The top of the mounting bracket (503) is fixed with a mounting plate (504), and the mounting plate (504) is fixedly connected to the servo electric cylinder (505).

4. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The buffer assembly includes a transition flange (506), a guide sleeve (507), a hydraulic damper (508), a gradient stiffness spring assembly (509), multiple limiting plates (510), a movable push rod (511), and a limiting sleeve (512). The transition flange (506) connects the push rod of the servo electric cylinder (505) to the rear end of the guide sleeve (507). The multiple limiting plates (510) are fixed to the rear end of the inner wall of the guide sleeve (507). The hydraulic damper (508) and the gradient stiffness spring assembly (509) are arranged in parallel inside the guide sleeve (507). The movable push rod (511) passes through the guide sleeve (507) and its rear end abuts against the hydraulic damper (508) and the gradient stiffness spring assembly (509). The limiting sleeve (512) is fixed to the front end of the inner wall of the guide sleeve (507) and restricts the extension length of the movable push rod (511).

5. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The anti-deflection guide includes multiple first ear seats (514), multiple linear bearings (515) and multiple guide shafts (516). The multiple first ear seats (514) are symmetrically fixed to the top of the mounting bracket (503). Each linear bearing (515) is installed in the corresponding first ear seat (514). Each guide shaft (516) passes through the corresponding linear bearing (515) and its front end is fixed to the back of the rigid block (517).

6. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The rigid block (517) has a micro-serrated surface (518) on its front side, and the back side of the rigid block (517) is fixedly connected to the tension and compression sensor (513). A silicone pad (519) is attached to the micro-serrated surface (518). The lower surface of the horizontal section of the L-shaped overflow baffle (520) is provided with a baffle rib (521). A baffle brush (522) is attached to one side of the baffle rib (521).

7. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The composite clamping end also includes multiple second ear seats (523), a pin (524), and a miniature torsion spring (525). The multiple second ear seats (523) are integrally formed on the upper edge of the front end of the horizontal section of the overflow baffle (520). The pin (524) passes through the inner wall of the multiple second ear seats (523) and the elastic pressure finger (526). The miniature torsion spring (525) is sleeved on the pin (524). The fixing arm of the miniature torsion spring (525) is engaged with the second ear seat (523), and the driving arm of the miniature torsion spring (525) abuts against the elastic pressure finger (526).

8. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The front end of the elastic pressure finger (526) facing the filter paper has a plurality of silicone bumps (527), and the plurality of silicone bumps (527) are evenly distributed.

9. The sealing and welding device for the plastic frame of the vehicle air conditioning filter element according to claim 1, characterized in that: The welding actuator (300) is fixed inside the gantry (200) and located above the guide assembly (400) and the clamping assembly (500). The tension and pressure sensor (513) is a spoke-type sensor. The servo electric cylinder (505) has a built-in position encoder and is connected to the controller together with the tension and pressure sensor (513) to form a closed-loop force control.

10. A sealing and welding process for the plastic frame of a vehicle air conditioning filter element, characterized in that: The sealing and welding device for the plastic frame of a vehicle air conditioning filter according to any one of claims 1 to 9 includes the following steps: S1: Fix the base frame (401) to the worktable (100), splice and fix the guide rail (403) to the inside of the base frame (401), install multiple elastic pieces (406) in the mounting groove on the outer wall of the guide rail (403), so that the two ends of each elastic piece (406) are fixed and the middle section is suspended, and embed multiple electric actuators (407) into the mounting blind hole (402) on the inside of the base frame (401), so that the push rod of each electric actuator (407) abuts against the middle section of the corresponding elastic piece (406); S2: The sliders (501) of the multiple clamping components (500) are clamped in the slide groove (404) inside the guide rail (403). According to the size of the filter element frame, the sliders (501) corresponding to the straight edge section are slid to the preset position. The locking bolts (502) are inserted vertically into the intermittent locking groove (405) and tightened so that the bottom end of the locking bolts (502) presses against the bottom surface of the slide groove (404) and the sliders (501) corresponding to the rounded corner section are directly locked and fixed. S3: Place the filter element horizontally in the center of the workbench (100), with the plastic frame to be welded facing upward and located within the enclosed area of ​​multiple clamping components (500). Activate the electric actuator (407) and adjust the extension amount of the electric actuator (407) according to the wall thickness difference in different areas of the filter element frame, so that the corresponding elastic sheet (406) produces different degrees of elastic deformation, thereby changing the local support stiffness of the guide rail (403). S4: Start the servo electric cylinder (505), whose push rod pushes the composite clamping end to feed horizontally towards the filter element through the buffer assembly and the tension and pressure sensor (513). The gradient stiffness spring group (509) and the hydraulic damper (508) in the buffer assembly adaptively compensate for the contour tolerance of the frame. The tension and pressure sensor (513) feeds back the clamping force to the controller in real time. When the clamping force reaches the preset value, the servo electric cylinder (505) stops feeding. At this time, the micro-serrated surface (518) on the front of the rigid block (517) and the silicone pad (519) clamp the plastic frame. The elastic pressure finger (526) presses the filter paper surface lightly through the silicone protrusion (527) under the action of the micro torsion spring (525). S5: Start the welding actuator (300) fixed inside the gantry (200) to seal the plastic frame of the filter element. During the welding process, the baffle rib (521) and the baffle brush (522) prevent the molten plastic from flowing to the filter paper. The guide shaft (516) and the linear bearing (515) in the anti-deflection guide suppress the radial deflection of the composite clamping end. S6: After welding is completed, the push rod of the servo electric cylinder (505) returns to the initial position, the electric actuator (407) is reset, the locking bolt (502) is loosened, and the welded filter element is taken out from the worktable (100).

Images