A molding strip for doors and windows and its processing technology

Abstract

This invention discloses a pressure strip for doors and windows and its processing technology, comprising a horizontal pressure strip I, a vertical pressure strip I, a horizontal pressure strip II, and a vertical pressure strip II connected at their ends in sequence. Adjacent pressure strips are vertically arranged, forming a complete square frame. All three pressure strips are connected to the window frame via an installation assembly, which is fixed to the window frame. This invention welds the scattered pressure strip components into a single square frame and completes installation using a pre-installed aluminum pressure plate snap-fit ​​structure. This solves the problems of traditional split pressure strips, such as laborious installation, uneven surfaces after assembly, and poor interior appearance. It offers convenient assembly, good sealing, high molding precision, and is suitable for mass production of plastic doors and windows with flush frames and sashes.

Description

Technical Field

[0001] This invention relates to the field of door and window technology, and in particular to a molding strip for doors and windows and its processing technology. Background Technology

[0002] The existing door and window frame flush structures mostly use separate single-strip glazing strips with legs. Each glazing strip is individually snapped into a pre-set glazing strip groove in the window frame profile, which has obvious drawbacks in actual production and use: 1. The split single-piece pressure strip has a built-in support leg structure. The profile dimensions are relatively large, and the operation of aligning and inserting each strip into the profile groove is cumbersome, resulting in high installation difficulty and low construction efficiency. 2. Individually assembled molding strips are affected by profile processing errors and manual assembly deviations. The joints of each molding strip are prone to height differences. The molding strips are placed on the interior side of the doors and windows. The unevenness seriously affects the aesthetics of the interior and exterior facades of the doors and windows. 3. Traditional pressure strips do not have an overall welding process, resulting in many seams when assembled from individual strips. They also have poor sealing when bonded to the glass, and the adhesive strips are prone to delamination, water leakage, and air leakage. Summary of the Invention

[0003] The purpose of this invention is to provide a molding strip for doors and windows and its processing technology to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a pressure strip for doors and windows, comprising a horizontal pressure strip one, a vertical pressure strip one, a horizontal pressure strip two, and a vertical pressure strip two connected at their ends in sequence. Adjacent pressure strips are arranged perpendicularly to each other. The horizontal pressure strip one, vertical pressure strip one, horizontal pressure strip two, and vertical pressure strip two form a complete square frame. The horizontal pressure strip one, vertical pressure strip one, horizontal pressure strip two, and vertical pressure strip two are all connected to the window frame by a mounting assembly, which is fixed to the window frame.

[0005] Furthermore, the ends of the first horizontal pressure strip, the first vertical pressure strip, the second horizontal pressure strip, and the second vertical pressure strip are welded together.

[0006] Furthermore, the welding surfaces of the first horizontal pressure strip, the first vertical pressure strip, the second horizontal pressure strip, and the second vertical pressure strip are inclined surfaces of 44.7°-45.3°.

[0007] Furthermore, each of the horizontal pressure strip 1, vertical pressure strip 1, horizontal pressure strip 2, and vertical pressure strip 2 is provided with a pressure strip adhesive strip between itself and the glass. The pressure strip adhesive strip is snapped onto the horizontal pressure strip 1, vertical pressure strip 1, horizontal pressure strip 2, and vertical pressure strip 2, and the other side of the pressure strip adhesive strip presses against the glass.

[0008] Furthermore, the installation assembly includes an L-shaped aluminum pressure plate. One outer end face of the L-shaped aluminum pressure plate is attached to the interior end face of the window frame, and the L-shaped aluminum pressure plate is fixed to the window frame with screws. The other outer end face of the L-shaped aluminum pressure plate is attached to the glass. An insert is connected to the end of the L-shaped aluminum pressure plate away from the glass. The insert has a corrugated outer wall and is wrapped with a glass pressure plate adhesive strip. The insert and the glass pressure plate adhesive strip are inserted into slots opened on the first horizontal pressure strip, the first vertical pressure strip, the second horizontal pressure strip, and the second vertical pressure strip.

[0009] Furthermore, an EVA single-sided sponge tape is provided between the L-shaped aluminum plate and the glass, and the EVA single-sided sponge tape is connected to the outer end face of the L-shaped aluminum plate by adhesive.

[0010] A processing technology for door and window molding strips, characterized by comprising the following steps: S1. Profile cutting: Cut the welding surfaces at both ends of horizontal pressure strip one, vertical pressure strip one, horizontal pressure strip two and vertical pressure strip two, and cut the welding surfaces into 45° bevels; S2. Pre-welding preparation: Check whether the power supply and air pressure of the welding machine are normal, and whether the values ​​of each pressure gauge are within the allowable working range. After turning on the machine, preheat it first. Do not let the rubber strip or protective film melt into the weld. The protective film should be cut off along the weld joint at the welding part to leave welding allowance. S3. Welding: When welding, ensure that the visible surface of the pressure strip is perpendicular to the welding plate, with an allowable error of +0.3°. At the same time, ensure that the welding surface is clean and strictly ensure that the angle between the front and rear templates and the positioning plate is 44.7°-45.3°. When welding, first weld one end of horizontal pressure strip one and horizontal pressure strip two to the two ends of vertical pressure strip one respectively, and then weld the two ends of vertical pressure strip two to the other ends of horizontal pressure strip one and horizontal pressure strip two respectively. S4. Inspection: After welding, the dimensions should meet the requirements. In batch production, the first piece must be inspected, and the rest should be sampled. For small batch and single-piece production, full inspection is required.

[0011] Furthermore, the horizontal pressure strip one, vertical pressure strip one, horizontal pressure strip two, and vertical pressure strip two are welded within 6 hours after cutting to avoid contamination of the welding surface.

[0012] Furthermore, during welding, the difference in diagonal dimensions should be less than 2.5mm. When welding mullions, the angle between the two weldments should be 89.5°-90.5°, and the reinforcing profile should not shift after welding.

[0013] Furthermore, after welding, the same flatness at the weld joint of adjacent components of the same profile is less than 0.2mm.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1. Convenient assembly and reduced construction difficulty: Abandoning the traditional split-type clamping structure with legs, the L-shaped aluminum pressure plate is first used to fix it to the window frame with screws. The pressure strip is pre-welded into a complete square frame and then installed as a whole with snap-fit. There is no need to align and snap it into the profile groove one by one, which greatly simplifies the installation process and reduces the assembly difficulty and labor time.

[0015] 2. Smooth surface and beautiful facade: The four pressure strips are welded together at an angle to form an integral frame without segmented splicing gaps or assembly misalignment, thus avoiding the problem of pressure strip height difference from the source. The surface of the pressure strip on the interior side of the door and window is smooth and flat, meeting the appearance design requirements of frame and sash being flush.

[0016] 3. Excellent sealing performance: The inner side of the pressure strip is clamped to the pressure strip to press the glass firmly. EVA single-sided sponge tape is added between the aluminum pressure plate and the glass for double buffer sealing. Combined with the multi-layer sealing structure of the glass pressure plate rubber strip around the plug, it effectively improves the air tightness and water tightness of the doors and windows.

[0017] 4. Controllable processing precision and high finished product stability: The end of the pressure strip is beveled at 44.7°-45.3° and welding is completed within 6 hours after cutting. The process indicators such as welding angle, flatness, and diagonal error are strictly controlled. The standardized welding process ensures the dimensional accuracy of the whole frame and the stable quality of mass production.

[0018] 5. Sturdy structure and not easy to fall off: The wavy and irregular outer wall insert is matched with the rubber strip and the pressure strip slot with interference fit. The buckle connection is reliable and is not easy to loosen due to temperature difference and vibration, thus extending the service life of door and window pressure strips. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a front view of the molding strip used in doors and windows according to the present invention; Figure 2 This is a partial schematic diagram of the installation of the pressure strip for doors and windows according to the present invention; Explanation of reference numerals in the attached diagram: 1. Horizontal pressure strip one; 2. Vertical pressure strip one; 3. Horizontal pressure strip two; 4. Vertical pressure strip two; 5. Pressure strip adhesive strip; 6. L-shaped aluminum pressure plate; 7. Screw; 8. Insert; 9. Glass pressure plate adhesive strip; 10. Slot; 11. EVA single-sided sponge tape. Detailed Implementation

[0021] Example 1 like Figure 1-2As shown, a type of molding strip for doors and windows is formed by welding horizontal molding strip 1, vertical molding strip 2, horizontal molding strip 3, and vertical molding strip 4 end to end to form a closed rectangular frame. Adjacent molding strips are perpendicular to each other, and the beveled cutting angle of the welded ends of the four molding strips is controlled between 44.7° and 45.3°. A molding strip adhesive strip 5 is installed between the molding strip and the glass. The adhesive strip 5 is snapped into the groove on the inside of the molding strip, and the other side of the adhesive strip tightly presses against the glass surface.

[0022] Multiple installation components are pre-installed on the window frame. The main body of the installation component is an L-shaped aluminum pressure plate 6. The interior end face of the L-shaped aluminum pressure plate 6 is locked and fixed to the window frame profile by screws 7. EVA single-sided foam tape 11 is bonded to the end face of the L-shaped aluminum pressure plate that is in contact with the glass. The EVA single-sided foam tape 11 is fixed by its own adhesive side. The foam tape is sandwiched between the aluminum pressure plate and the glass to achieve a buffer seal. The end of the L-shaped aluminum pressure plate away from the glass is fixed with a plug 8. The outer wall of the plug has a wavy irregular structure. Glass pressure plate adhesive strips 9 are fitted on the outside of the plug. The side walls of the horizontal and vertical pressure strips have pre-made slots 10. The plug and the glass pressure plate adhesive strip are inserted and limited in the slots 10 to achieve the snap-lock fixation of the entire frame pressure strip.

[0023] Steps for pressing strips: S1. Profile cutting: The CNC equipment uniformly cuts the two ends of the four pressure strips with a 44.7°-45.3° bevel. Welding is completed within 6 hours after cutting to prevent dust from falling on the cut surface and affecting the welding strength.

[0024] S2. Pre-welding preparation: Select a seamless welding special door and window welding machine, turn on the machine and check the power supply, air pressure and pressure gauge parameters, and preheat the equipment in advance; cut off the protective film at the welding position of the pressure strip along the weld joint, leave welding allowance, and strictly prohibit the protective film and adhesive strip from mixing into the weld. S3 Welding Forming: The clamping profile ensures that the visible surface of the pressure strip is orthogonal to the welding plate, with an angle error ≤ +0.3°. The positioning angle of the template is controlled at 45°±0.3°. The welding heating temperature is finely adjusted according to the profile, with a heating time of 20-30s and a holding pressure time of 25-35s. The heating pressure is 0.3-0.4MPa, the feed pressure is 0.35-0.5MPa, and the holding pressure is 0.4-0.5MPa. After welding, the length and width of a single frame are ≤1500mm with a tolerance of ±1.0mm, and the tolerance is ±1.5mm for dimensions >1500mm. The difference between the diagonals of the square frame is ≤2.5mm. The included angle at the right-angle weld of the profile is 90°±0.5°. The flatness of the welded joint is ≤0.2mm. S4. Inspection: Full inspection of the first piece in batch production, sampling inspection of the remaining pieces, and full inspection of single pieces / small batches of products.

[0025] On-site assembly steps: Apply EVA single-sided sponge tape 11 to the glass end face of L-shaped aluminum pressure plate 6, and screw 7 through L-shaped aluminum pressure plate 6 to fasten it to the inner surface of window frame, with sponge tape tightly attached to glass surface. An insert 8 with a corrugated outer wall is fixed at the end of the L-shaped aluminum pressure plate 6, and the outside of the insert is covered with a glass pressure plate adhesive strip 9; Insert the pre-welded frame strip into the inner groove of the strip into the strip adhesive strip 5; Align the slot 10 with the plug 8 and the glass pressure plate strip 9, press the entire frame strip together, so that the glass pressure plate strip 9 and the plug 8 are fully inserted into the slot 10, and are fixed by the irregular plug. The strip and the EVA sponge tape hold the glass in both directions, completing the frame and sash flush door and window strip assembly.

[0026] Example 2 The preferred bevel angle for welding the pressure strip is 45°; the welding heating time is 25s and the holding time is 30s; the heating pressure is 0.35MPa, the feed pressure is 0.4MPa, and the holding pressure is 0.45MPa. The remaining structural components, assembly methods, and dimensional tolerances are the same as in Example 1, and it is suitable for conventional standard-sized plastic doors and windows.

[0027] Example 3 For large door and window trim strips with a single side length >1500mm, welding is completed within 4 hours after the profile is cut to shorten the settling time; the welding pressure holding time is extended to 35s, the overall frame size tolerance is controlled at ±1.5mm, and the diagonal error is still ≤2.5mm; multiple L-shaped aluminum pressure plates are arranged in sections to ensure that the large frame trim strip is subjected to uniform force, and the assembly structure and sealing structure remain unchanged.

[0028] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A molding strip for doors and windows, characterized in that: It includes a horizontal pressure strip one (1), a vertical pressure strip one (2), a horizontal pressure strip two (3), and a vertical pressure strip two (4) connected at their ends in sequence. The two adjacent pressure strips are set vertically. The horizontal pressure strip one (1), the vertical pressure strip one (2), the horizontal pressure strip two (3), and the vertical pressure strip two (4) form a complete square frame. The horizontal pressure strip one (1), the vertical pressure strip one (2), the horizontal pressure strip two (3), and the vertical pressure strip two (4) are all connected to the window frame by a mounting component, which is fixed to the window frame.

2. The molding strip for doors and windows according to claim 1, characterized in that: The ends of the horizontal pressure bar one (1), the vertical pressure bar one (2), the horizontal pressure bar two (3), and the vertical pressure bar two (4) are welded together.

3. The molding strip for doors and windows according to claim 2, characterized in that: The welding surfaces of the horizontal pressure bar one (1), vertical pressure bar one (2), horizontal pressure bar two (3) and vertical pressure bar two (4) are inclined surfaces of 44.7°-45.3°.

4. The molding strip for doors and windows according to claim 1, characterized in that: A pressure strip (5) is provided between the horizontal pressure strip one (1), the vertical pressure strip one (2), the horizontal pressure strip two (3), and the vertical pressure strip two (4) and the glass. The pressure strip (5) is snapped onto the horizontal pressure strip one (1), the vertical pressure strip one (2), the horizontal pressure strip two (3), and the vertical pressure strip two (4), and the other side of the pressure strip (5) is pressed onto the glass.

5. The molding strip for doors and windows according to claim 1, characterized in that: The installation assembly includes an L-shaped aluminum pressure plate (6), one outer end face of which is attached to the interior end face of the window frame. The L-shaped aluminum pressure plate (6) is fixed to the window frame by screws (7). The other outer end face of the L-shaped aluminum pressure plate (6) is attached to the glass. An insert (8) is connected to the end of the L-shaped aluminum pressure plate (6) away from the glass. The insert (8) has a wavy outer wall. The outside of the insert (8) is wrapped with a glass pressure plate adhesive strip (9). The insert (8) and the glass pressure plate adhesive strip (9) are inserted into the slots (10) opened on the horizontal pressure strip one (1), vertical pressure strip one (2), horizontal pressure strip two (3), and vertical pressure strip two (4).

6. The molding strip for doors and windows according to claim 5, characterized in that: An EVA single-sided sponge tape (11) is provided between the L-shaped aluminum pressure plate (6) and the glass, and the EVA single-sided sponge tape (11) is connected to the outer end face of the L-shaped aluminum pressure plate (6) by adhesive.

7. A processing method for a door and window molding strip according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Profile cutting: Cut the welding surfaces at both ends of horizontal pressure strip one (1), vertical pressure strip one (2), horizontal pressure strip two (3) and vertical pressure strip two (4) into 45° bevels; S2. Pre-welding preparation: Check whether the power supply and air pressure of the welding machine are normal, and whether the values ​​of each pressure gauge are within the allowable working range. After turning on the machine, preheat it first. Do not let the rubber strip or protective film melt into the weld. The protective film should be cut off along the weld joint at the welding part to leave welding allowance. S3. Welding: When welding, it is essential to ensure that the visible surface of the pressure strip is perpendicular to the welding plate, with an allowable error of +0.3°. At the same time, the welding surface must be kept clean. The angle between the front and rear templates and the positioning plate must be strictly maintained at 44.7°-45.3°. When welding, first weld one end of the horizontal pressure strip (1) and the horizontal pressure strip (3) to both ends of the vertical pressure strip (2), and then weld both ends of the vertical pressure strip (4) to the other ends of the horizontal pressure strip (1) and the horizontal pressure strip (3). S4. Inspection: After welding, the dimensions should meet the requirements. In batch production, the first piece must be inspected, and the rest should be sampled. For small batch and single-piece production, full inspection is required.

8. The processing technology for the molding strip used in doors and windows according to claim 7, characterized in that: The horizontal pressure strip one (1), vertical pressure strip one (2), horizontal pressure strip two (3) and vertical pressure strip two (4) are welded within 6 hours after cutting to avoid contamination of the welding surface.

9. The processing technology for the molding strip used in doors and windows according to claim 7, characterized in that: During welding, the difference in diagonal dimensions should be less than 2.5mm. When welding mullions, the angle between the two weldments should be 89.5°-90.5°. After welding, ensure that the reinforcing profile does not shift.

10. The processing technology for the molding strip used in doors and windows according to claim 7, characterized in that: After welding, the same flatness at the weld joint of adjacent components of the same profile is less than 0.2mm.

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