A resonator housing hot plate welding mechanism for vehicle

Abstract

The utility model provides a kind of hot melt welding mechanism of resonator shell for vehicle, including rack, two corresponding shell seats are slidably installed on the rack, negative pressure pump is installed and arranged on each shell seat, and is equipped with positioning cavity, negative pressure hole is opened in the groove bottom of positioning cavity, the output end of hydraulic cylinder fixedly installed on each shell seat with corresponding rack is fixed;Ball screw is rotatably installed on the upper portion of rack, sliding shaft is fixedly installed below it, the upper portion of hot melt plate is fixedly connected with ball nut installed on ball screw, the lower portion of hot melt plate is slidably connected with sliding shaft, one end of ball screw is fixedly connected with the output end of servo motor fixedly installed on rack;The utility model is fixed without contact by negative pressure adsorption, to avoid the indentation and deformation caused by mechanical clamp;Erected rack makes hot melt plate avoid to inside of protrusion, to eliminate motion interference;Hot melt plate drive precision can double-side synchronous heating shell welding surface, to avoid one-side melting uneven.

Description

Technical Field

[0001] This utility model belongs to the field of heat sealing and welding technology, and in particular relates to a heat sealing and welding mechanism for automotive resonator housings. Background Technology

[0002] As a key component of automotive intake and exhaust systems, automotive resonators require their housings (mostly made of thermoplastic plastics such as PP and PE) to be sealed by heat welding to meet the airtightness (typically IP67 rating) and structural strength requirements (weld tensile strength ≥10MPa) under the high temperature and vibration environment of the engine compartment. Currently, mainstream resonator housing heat welding equipment in the industry has the following technical defects:

[0003] Existing equipment mostly uses a horizontal layout to install the housing base. When the thin-walled plastic housing is placed horizontally, it is prone to sagging and deformation due to gravity, resulting in misalignment of the welded surfaces. At the same time, the fixing method is mostly mechanical clamps (such as buckles and pressure plates), which can easily form indentations or local stress deformation on the housing surface. This not only affects the appearance qualification rate, but may also damage the housing sealing structure, resulting in failure to meet airtightness standards.

[0004] Horizontal layout requires reserving redundant space for the left and right movement of the heat-sealing plate. The overall footprint of the equipment is 30%-50% higher than that of the vertical layout, making it unsuitable for compact automotive parts production lines. Furthermore, the reset path of the heat-sealing plate of some equipment overlaps with the docking path of the housing seat, which can easily cause movement interference, leading to equipment shutdown or component damage.

[0005] Therefore, it is essential to invent a heat-sealing welding mechanism for automotive resonator housings. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a heat-sealing welding mechanism for automotive resonator housings, including a frame, housing seats, a negative pressure pump, a positioning cavity, a negative pressure hole, a hydraulic cylinder, a ball screw, a sliding shaft, a heat-sealing plate, a ball nut, and a servo motor. Two corresponding housing seats are slidably mounted on the frame. Each housing seat is equipped with the negative pressure pump and has a positioning cavity. The bottom of the positioning cavity has a negative pressure hole. Each housing seat is fixed to the output end of a hydraulic cylinder fixedly mounted on the corresponding frame. A ball screw is rotatably mounted on the top of the frame, and a sliding shaft is fixedly mounted below it. The top of the heat-sealing plate is fixedly connected to the ball nut mounted on the ball screw, and the bottom of the heat-sealing plate is slidably connected to the sliding shaft. One end of the ball screw is fixed to the output end of a servo motor fixedly mounted on the frame.

[0007] Preferably, the axes of the two housing seats slidably mounted on the frame are parallel to each other and perpendicular to the ground, each of the housing seats is internally provided with an air chamber, the air chamber is in communication with the negative pressure holes arranged in an array in the positioning cavity, and is also in communication with a negative pressure pump fixedly mounted outside the housing seat.

[0008] Preferably, the two housing seats do not interfere with the ball screw and the sliding shaft arranged at upper and lower positions, and the ball screw and the sliding shaft are installed at the upper and lower positions in the middle of the frame.

[0009] Preferably, the frame is composed of an upper frame, a lower frame and two end plates on both sides, wherein the upper frame and the lower frame are of a "convex" shape structure, and the heat-sealing plate can move to the inner sides of the protrusions of the upper frame and the lower frame of the frame without interfering with the docking of the two housing seats.

[0010] Preferably, the heat-sealing plate can be driven by the ball screw to perform transverse movement, the movement path of which intersects with the movement path of the housing seats, and the heat-sealing plate can move to a position between the two housing seats.

[0011] Preferably, the heat-sealing plate is an electric heating plate, and both end surfaces thereof can be in contact with the heat-sealing surfaces of the resonator shell adsorbed on the housing seats.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model adopts the fixing mode of "negative pressure pump + air chamber + negative pressure holes", and the negative pressure adsorption (negative pressure value -0.06 ~ -0.08MPa) can realize non-contact fixing of the shell, eliminate indentation and stress deformation caused by mechanical fixtures, and increase the appearance qualification rate to more than 99.9%.

[0014] The frame of the utility model adopts an integrated structure with upper and lower frames in a convex shape, the heat-sealing plate can move to the inner sides of the protrusions of the upper and lower frames, and its transverse movement path intersects with and does not overlap the vertical movement paths of the housing seats, which completely eliminates movement interference and improves the operation stability of the equipment.

[0015] The heat-sealing plate of the utility model is driven by "servo motor + ball screw + sliding shaft", the transmission precision of the ball screw reaches ±0.01mm, and the sliding shaft limits the shaking of the heat-sealing plate, which can accurately send the heat-sealing plate between the two housing seats, ensuring that both end surfaces of the heat-sealing plate are completely attached to the welding surfaces of the upper and lower shells; the heat-sealing plate is an electric heating plate, and the two end surfaces can synchronously heat the welding surfaces of the upper and lower shells, with a melting temperature difference ≤ 3°C (achieving ±2°C precision through PID temperature control), avoiding the problem of uneven melting on a single side. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 This is another overall structural schematic diagram of this utility model.

[0018] Figure 3 This is a schematic diagram of the bottom structure of this utility model.

[0019] In the picture:

[0020] Frame 1, housing base 2, negative pressure pump 3, positioning cavity 4, negative pressure hole 5, hydraulic cylinder 6, ball screw 7, sliding shaft 8, heat-sealed plate 9, ball nut 10, servo motor 11. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 should fall within the protection scope of the present invention.

[0022] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0023] As attached Figure 1 To be continued Figure 3 As shown:

[0024] This utility model provides a heat-sealing welding mechanism for automotive resonator housings, comprising a frame 1, a housing seat 2, a negative pressure pump 3, a positioning cavity 4, a negative pressure hole 5, a hydraulic cylinder 6, a ball screw 7, a sliding shaft 8, a heat-sealing plate 9, a ball nut 10, and a servo motor 11. Two corresponding housing seats 2 are slidably mounted on the frame 1. Each housing seat 2 is equipped with a negative pressure pump 3 and has a positioning cavity 4. The bottom of the positioning cavity 4 has a negative pressure hole 5. Each housing seat 2 is fixed to the output end of the hydraulic cylinder 6 fixedly mounted on the corresponding frame 1. A ball screw 7 is rotatably mounted on the top of the frame 1, and a sliding shaft 8 is fixedly mounted below it. The top of the heat-sealing plate 9 is fixedly connected to the ball nut 10 mounted on the ball screw 7, and the bottom of the heat-sealing plate 9 is slidably connected to the sliding shaft 8. One end of the ball screw 7 is fixed to the output end of the servo motor 11 fixedly mounted on the frame 1.

[0025] Furthermore, the axes of the two slidingly mounted housing seats 2 on the frame 1 are parallel to each other and perpendicular to the ground. Their sliding fit structure is as follows: high-precision linear guides (THKSR series optional) are symmetrically fixed to the inner sides of the end plates on both sides of the frame 1. The sides of the housing seats 2 are slidably connected to the linear guides via sliders, ensuring that the housing seats 2 move without wobbling in the vertical direction. Each housing seat 2 is integrally milled from 6061-T6 aluminum alloy, with an internally reserved annular air cavity (volume 50-80 cm³). 3 The air chamber is connected to the negative pressure holes 5 (distributed in a plum blossom pattern) at the bottom of the positioning cavity 4 through an internal through hole of φ8mm. At the same time, the air chamber is sealed to the outlet of the negative pressure pump 3 (model KNFN86KTE, vacuum degree -90kPa) installed outside the housing 2 through a φ10mm metal bellows. The end of the bellows is fastened to the air chamber interface of the housing 2 through a brass quick connector to ensure that there is no leakage during the negative pressure transmission process.

[0026] Furthermore, the two housing seats 2 do not interfere with the ball screw 7 and slide shaft 8 positioned vertically. The ball screw 7 and slide shaft 8 are horizontally mounted in the middle of the frame 1 via bearing seats. The two ends of the ball screw 7 are fixed to the bearing seats of the upper frame of the frame 1 by angular contact ball bearings, and its axis is parallel to the ground. The two ends of the slide shaft 8 are fixed to the bearing seats of the lower frame of the frame 1 by interference fit, and remain parallel to the ball screw 7. The movement trajectory of the two housing seats 2 intersects the axes of the ball screw 7 and slide shaft 8 at 90°, and there is no mechanical interference between them during movement.

[0027] Further, the frame 1 is a rigid frame formed by fastening the upper and lower frames and the two end plates with M10 hexagon socket head cap bolts, wherein the upper and lower frames are made of Q235 steel plates that are welded and then milled into a "convex" shape structure. Driven by the ball screw 7, the heat sealing plate 9 can be displaced in the horizontal direction to the inner raised region of the upper and lower frames of the frame 1. At this time, the end face of the heat sealing plate 9 is at a distance of ≥30mm from the mating faces of the two housing seats 2, completely avoiding the mating movement trajectory of the housing seats 2, so as to ensure that the closing action of the housing seats 2 during the welding stage is not interfered with at all.

[0028] Further, the heat sealing plate 9 can be moved by the ball screw 7, and its movement path forms a 90° spatial intersection with the vertical movement path of the housing seats 2: the top of the heat sealing plate 9 is rigidly connected to the ball nut 10 on the ball screw 7 via bolts, and the bottom thereof is slidably fitted with the sliding shaft 8 via a sliding bearing, so as to realize stable transmission of "screw drive - sliding shaft guidance". When the servo motor 11 (model can be selected from Panasonic MSME series, rated speed 3000rpm) drives the ball screw 7 to rotate in the forward direction, the heat sealing plate 9 moves horizontally toward the center of the frame 1, and its stroke end position is accurately stopped between the two housing seats 2. At this time, the center line of the heat sealing plate 9 is collinear with the axes of the two housing seats 2 (coaxiality error ≤0.03mm), so as to ensure that the heating surfaces on both sides uniformly contact the welding surfaces of the housings.

[0029] Further, the heat sealing plate 9 is an integrated electric heating plate, which adopts a 0Cr25Ni20 stainless steel base plate (15mm in thickness), with 6 sets of nichrome heating tubes embedded inside (total power 3kW, single set power 500W), and the heating tubes are distributed in an S-shape and arranged symmetrically on both sides. The two end faces of the heat sealing plate 9 are subjected to precision grinding (flatness ≤0.01mm, roughness Ra 0.8μm), and the surface is sprayed with a Teflon anti-stick coating (50μm in thickness), which can effectively prevent the molten housing material from sticking. When the heat sealing plate 9 moves between the two housing seats 2, its two end faces can be completely attached to the heat sealing surfaces of the resonator housings fixed by suction on the housing seats 2 (contact area ≥95%), so as to ensure that the welding surfaces are uniformly heated and melted.

[0030] Furthermore, two sets of K-type thermocouples (measuring range 0-300℃, accuracy ±1℃) are embedded inside the heat-sealed plate 9. The thermocouple leads are connected to a PID temperature controller (Omron E5CC series optional) mounted on the side of the frame 1 via high-temperature shielded wire (temperature resistance 200℃). The heating tube power cord is connected to a solid-state relay (Schneider SSR series optional) via a wiring channel inside the frame 1. The solid-state relay is controlled by the output signal of the temperature controller. The entire circuit is connected in series with a 10A overload protector, and a limit switch is set at the extreme positions of the heat-sealed plate 9. When the heat-sealed plate 9 has not reached the designated heating position, the temperature controller prohibits heating output, forming a double safety protection. The temperature controller is connected to the main controller of the equipment via an RS485 communication interface, which can upload temperature data in real time and receive target temperature commands (control accuracy ±2℃), realizing automated closed-loop control of the heating process.

[0031] The working principle is as follows: First, place the upper and lower housings of the resonator to be welded into the positioning cavities 4 of the housing seats 2 on both sides of the frame 1, respectively. Then, start the negative pressure pump 3 and use the negative pressure generated by the negative pressure hole 5 to firmly adsorb and fix the housings onto the housing seats 2.

[0032] Next, the servo motor 11 drives the ball screw 7 to rotate, which in turn drives the ball nut 10 and the heat-sealing plate 9 connected thereto to move laterally along the slide shaft 8 until the heat-sealing plate 9 moves between the two housing seats 2, and the two end faces of the heat-sealing plate 9 are respectively opposite to the housing welding surfaces adsorbed on the two housing seats 2.

[0033] Next, the hydraulic cylinder 6 fixed on the frame 1 extends, driving the two housing seats 2 to move along the sliding structure of the frame 1 toward the heat-sealing plate 9, until the welding surfaces of the two housings contact the two end faces of the heat-sealing plate 9 respectively. The heat-sealing plate 9 is energized and heats up, melting the welding surfaces of the housings.

[0034] Then, after the welded surface of the shell reaches the predetermined melting state, the hydraulic cylinder 6 retracts, driving the two shell seats 2 to move away from the heat-sealed plate 9, so that the welded surface of the shell separates from the heat-sealed plate 9.

[0035] Subsequently, the servo motor 11 drives the ball screw 7 in the reverse direction, causing the heat-sealing plate 9 to move laterally along the slide shaft 8 until the heat-sealing plate 9 completely exits the space between the two housing seats 2 and is displaced to the inner side of the protrusion of the upper and lower frames of the frame 1.

[0036] Finally, the hydraulic cylinder 6 extends again, driving the two housing seats 2 to continue moving towards each other until the molten welding surfaces of the two housings come into contact with each other and fit tightly together, completing the heat sealing welding; after the welding is completed, the hydraulic cylinder 6 retracts and resets, the negative pressure pump 3 stops working and releases the negative pressure, and the welded resonator housing can be taken out.

[0037] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A heat-sealing welding mechanism for a vehicle resonator housing, characterized in that, comprising a frame (1), a housing base (2), a negative pressure pump (3), a positioning cavity (4), a negative pressure hole (5), a hydraulic cylinder (6), a ball screw (7), a sliding shaft (8), a heat-sealing plate (9), a ball nut (10) and a servo motor (11). Two corresponding said housing bases (2) are slidably mounted on said frame (1), each said housing base (2) is provided with said negative pressure pump (3) and formed with said positioning cavity (4), the bottom of said positioning cavity (4) is formed with said negative pressure hole (5), and each said housing base (2) is fixed to the output end of the hydraulic cylinder (6) fixedly mounted on the corresponding said frame (1); said ball screw (7) is rotatably mounted above said frame (1), said sliding shaft (8) is fixedly mounted below said frame (1), the upper part of said heat-sealing plate (9) is fixedly connected to said ball nut (10) mounted on said ball screw (7), the lower part of said heat-sealing plate (9) is slidably connected to said sliding shaft (8), and one end of said ball screw (7) is fixed to the output end of the servo motor (11) fixedly mounted on said frame (1).

2. The automotive resonator housing heat-sealing welding mechanism as described in claim 1, characterized in that: The axes of the two said housing bases (2) slidably mounted on said frame (1) are parallel to each other and perpendicular to the ground, an air cavity is provided inside each said housing base (2), the air cavity is in communication with the negative pressure holes (5) arranged in an array in the positioning cavity (4), and is also in communication with the negative pressure pump (3) fixedly mounted outside said housing base (2).

3. The heat-sealing welding mechanism for a vehicle resonator housing as described in claim 2, characterized in that: The two said housing bases (2) do not interfere with the ball screw (7) and the sliding shaft (8) arranged at upper and lower positions, and said ball screw (7) and sliding shaft (8) are mounted at the upper and lower positions in the middle of said frame (1).

4. The heat-sealing welding mechanism for a vehicle resonator housing as described in claim 3, characterized in that: Said frame (1) is a frame composed of an upper frame, a lower frame and two side end plates, wherein the upper and lower frames are in a "convex" shape, and said heat-sealing plate (9) can move to the inner side of the protrusions of the upper and lower frames of said frame (1) without interfering with the butt joint of the two said housing bases (2).

5. The heat-sealing welding mechanism for a vehicle resonator housing as described in claim 4, characterized in that: Said heat-sealing plate (9) can be driven by said ball screw (7) to perform transverse movement, the movement path of which intersects with the movement path of the housing bases (2), and said heat-sealing plate (9) can move to the position between the two said housing bases (2).

6. The heat-sealing welding mechanism for a vehicle resonator housing as described in claim 5, characterized in that: Said heat-sealing plate (9) is an electric heating plate, and both end faces thereof can be in contact with the heat-sealing surfaces of the resonator housing adsorbed on the housing bases (2).

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