Thermal expansion and cold contraction preventing steel lining reinforced connecting piece for plastic-steel doors and windows
By using retractable steel insert joints in PVC doors and windows, the problem of mismatch between thermal expansion and contraction of plastic profiles and reinforced steel linings is solved, achieving continuous connection of plastic profiles during thermal expansion and contraction and rigid support during fire.
Patent Information
- Application Number
- CN202520398582.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-10
AI Technical Summary
The different coefficients of thermal expansion and contraction between the plastic profiles and the reinforcing steel lining caused pull-out gaps to appear at both ends of the mullion plastic profiles. Furthermore, the plastic profiles softened during a fire, causing the frame to lose its supporting capacity.
The device employs a retractable steel insert connector. The plug section slides into the reinforcing steel liner, while the end section is fixedly connected to the plastic profile. The corners of the frame are secured with connecting nails, enabling a micro-expansion connection between the plug section and the reinforcing steel liner. This ensures continuous connection and rigid support during thermal expansion and contraction.
This effectively prevents the gaps from forming when the midsole plastic profiles shrink due to cold, ensuring that the frame still has strong support capacity under fire conditions, and solving the problem of unstable connection caused by thermal expansion and contraction.
Smart Images
Figure CN223922932U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of plastic-steel door and window connecting device, especially relates to a plastic-steel door and window heat expansion and cold contraction steel lining reinforced connecting piece. BACKGROUND
[0002] The frame and the middle support of the door and window profile are provided with the reinforced steel lining to enhance the overall strength and prevent the profile from deforming, and the plastic profile and the reinforced steel lining need to be firmly connected by nailing. However, due to the influence of thermal expansion and cold contraction, the thermal expansion and cold contraction coefficients of the plastic profile and the reinforced steel lining are different (the thermal expansion and cold contraction coefficient of the plastic profile is larger), and in winter, the cold shrinkage of the middle support plastic profile is greater than that of the reinforced steel lining inside, resulting in the occurrence of the pull joint at both ends of the middle support plastic profile.
[0003] In addition, the corner of the conventional door and window profile can only be externally welded, that is, the plastic profile outside can only be welded at an angle of 45 degrees to meet the wind pressure resistance requirement, and the reinforced steel lining inside cannot be welded, and at this time, the reinforced steel lining at the corner is in a non-rigid connection state, and when a fire occurs, the plastic profile becomes soft, and the entire frame has no supporting capacity. UTILITY MODEL CONTENTS
[0004] In order to solve the problem of the cold shrinkage of the middle support plastic profile at both ends of the existing plastic-steel door and window, and to solve the problem of the lack of supporting capacity of the entire frame after the existing plastic-steel door and window is exposed to fire, the utility model provides a plastic-steel door and window heat expansion and cold contraction steel lining reinforced connecting piece, which solves the above problems by a telescopic steel lining plug connector, and has the advantages of simple structure, reasonable design, low cost and remarkable effect.
[0005] The utility model provides a technical scheme: a plastic-steel door and window heat expansion and cold contraction steel lining reinforced connecting piece, which comprises a plastic profile, a reinforced steel lining and a steel lining plug connector, the steel lining plug connector is installed in the plastic profile and located at both ends of the reinforced steel lining, the steel lining plug connector comprises two sections, namely a plug section and an end section, the plug section is slidably inserted into the reinforced steel lining, at the middle support, the end section is fixedly connected with the plastic profile by a connecting nail, so that when the middle support plastic profile shrinks, the plug section is inserted into the reinforced steel lining to produce synchronous shrinkage, avoiding the continuous root connection caused by the pull joint at both ends of the middle support plastic profile; at the frame corner, after the plastic profile is hot melt welded, the two end sections inside are fixedly connected by a connecting nail, the reinforced steel lining and the plug section are connected in a telescopic manner, thereby preventing the plastic profile from being cracked when it shrinks, and ensuring that the entire frame still has strong supporting capacity when the plastic profile becomes soft due to fire.
[0006] A further technical scheme is that at the middle support, the end section is fixedly connected with the reinforced steel lining in the upper and lower frames by a connecting nail.
[0007] Further technical solutions are: the material of the steel lining plug joint is steel.
[0008] Further technical solutions are: the size of the end section is consistent with the size of the reinforced steel lining.
[0009] Compared with the prior art, the beneficial effects of the utility model lie in:
[0010] 1. In the middle support, the end section is fixedly connected with the plastic profile, so that even if the middle support plastic profile is cold and shrinks, the end section can shrink with the middle support plastic profile, so that continuous rooting connection of the two ends of the middle support plastic profile can be avoided.
[0011] 2. In the frame corner, after the plastic profile is hot melt welded, the two end sections inside are fixedly connected through the connecting nails, the reinforced steel lining and the plug section are connected in a slightly extensible manner, so that the problem of cracking of the plastic profile when cold shrinking is prevented, and the entire frame rigid connection still has strong supporting ability when the plastic profile is soft due to fire. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 is the overall structure schematic view of the utility model.
[0013] Figure 2 is the local enlarged view of I in the utility model.
[0014] In the figure: 1, plastic profile; 2, reinforced steel lining; 3, plug section; 4, end section; 5, connecting nail. DETAILED DESCRIPTION
[0015] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clear and explicit, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.
[0016] Referring to the drawings Figure 1 , 2 , the embodiment includes a plastic profile 1, a reinforced steel lining 2 and a steel lining plug joint, the steel lining plug joint is installed in the plastic profile 1 and located at both ends of the reinforced steel lining 2, the steel lining plug joint includes two sections, which are respectively called plug section 3 and end section 4, wherein the plug section 3 is slidably inserted into the reinforced steel lining 2. In the middle support, the end section 4 is fixedly connected with the plastic profile 1 through the connecting nail 5, so that when the middle support plastic profile 1 cold shrinks, the plug section 3 is inserted into the reinforced steel lining 2, so that the overall steel lining and the plastic middle support profile are shrunk synchronously, avoiding the continuous rooting connection of the two ends of the plastic middle support profile 1.
[0017] At the frame corner, after the hot melt welding of the plastic profile 1 is completed, the two end sections 4 inside are fixedly connected through the connecting nails 5, the reinforced steel lining 2 and the plug-in section 3 are connected in a micro-expandable manner, so that the problem of cracking of the plastic profile 1 due to cold shrinkage is prevented, and the entire frame still has strong supporting capacity when the plastic profile 1 becomes soft due to fire. At the middle support, the end section 4 and the reinforced steel lining 2 in the upper and lower frames are fixedly connected through the connecting nails 5.
[0018] The material of the steel lining plug-in joint is steel.
[0019] The outer dimension of the end section 4 is consistent with that of the reinforced steel lining 2.
[0020] In summary, the application has different beneficial effects at the middle support and the frame corner, is simple in structure, reasonable in design, low in cost, excellent in effect, and suitable for popularization and use in the industry.
Claims
1. A heat-resistant steel-lined reinforcing connector for PVC doors and windows, comprising a plastic profile (1) and a reinforcing steel liner (2), characterized in that: It also includes a steel bushing connector, which is installed inside the plastic profile (1) and located at both ends of the reinforcing steel bushing (2). The steel bushing connector includes two sections, referred to as the plug section (3) and the end section (4), respectively. The plug section (3) is slidably inserted into the reinforcing steel bushing (2). At the middle section, the end section (4) is fixedly connected to the plastic profile (1) by a connecting nail (5). At the corner of the frame, the end section (4) is fixedly connected to the end section (4) by a connecting nail (5). At the corner of the frame, the end section (4) is freely matched with the plastic profile (1).
2. The heat-resistant steel-lined reinforced connector for PVC doors and windows according to claim 1, characterized in that: At the mid-section, the end section (4) is fixedly connected to the reinforcing steel lining (2) in the upper and lower frames by connecting nails (5).
3. The heat-resistant steel-lined reinforced connector for PVC doors and windows according to claim 1, characterized in that: The steel bushing connector is made of steel.
4. The heat-resistant steel-lined reinforced connector for PVC doors and windows according to claim 1, characterized in that: The external dimensions of the end section (4) are consistent with those of the reinforcing steel liner (2).