So, what is door and window hardware? How to choose door and window hardware?
1.What is a door and window hardware system?
Door and window hardware is a general term for various metal and non-metal fittings installed on doors and windows of buildings, which play an auxiliary role when opening and closing doors and windows. The surface is generally plated or coated, which is strong, durable, flexible, economical and beautiful.
Door and window hardware can be divided into opening and closing parts, load-bearing parts, operating parts, and auxiliary parts. Through the matching and integration of the system, it serves the subsystems of the door and window system.
It also needs systematic technical support and after-sales service. We can neither simply talk about a certain hardware product, nor can we abandon individual hardware components and talk about the concept of “door and window hardware system”.
A systematic concept should be established, and corresponding plans should be made for various hardware products. Within the framework of a large “door and window system”, changes in profiles, glass, rubber strips, processing techniques, and even door and window opening methods require corresponding changes in door and window hardware to better serve doors and windows.
2.What are the effects of load on the selection of door and window hardware accessories?
Load requirements for the selection of hardware accessories for doors and windows: When hardware is selected, first of all, the three functions of doors and windows (wind pressure resistance, water tightness, air tightness) and performance requirements for heat preservation, heat insulation, and sound insulation must be ensured. In 2012, the Ministry of Housing and Urban-Rural Development re-issued the GB50009-2012 “Building Structure Load Code”.
Various parameters such as temperature effect, variable load, accidental load, permanent load, wind load height change coefficient and mountain topography correction coefficient (the entry “correction coefficient” is provided by Industry Encyclopedia) and other parameters have been added and adjusted, and wind vibration The content and method of calculation have been greatly improved and perfected. The basic snow pressure and basic wind pressure values of some cities have been adjusted, and a new national basic snow pressure and basic wind pressure map has been drawn. It provides a more detailed theoretical basis for our calculations.
3.How to calculate the lock point formula?
The calculation of the number of lock points is more complicated. Here is a simplified calculation formula for the number of lock points:
Suppose n is the number of lock points; W is the width of the fan; H is the height of the fan; Wk is the standard wind pressure; the safety factor is 2.5 times, then n=W×H×2.5×Wk/0.8 (pieces)
Calculation example:
For a building in a certain place, Wk is calculated to be 2.2KN/m², and the number of lock points required for a window with a height of 1.2 and a height of 0.6 m: N=1.2×0.6×2.5×2.2/0.8≈5 (pieces)
After determining the number of lock points, you need to select the appropriate hardware category according to the cross-sectional shape of the door and window profiles. Different hardware types, the shape and use of the lock points are not the same. Generally, the hinges or sliding supports of the casement window are regarded as the lock points.
4.Should a door and window system be made first to order the door and window profiles, or to order the hardware accessories?
When considering the problem of hardware selection in the door and window system, it is first necessary to have an overall research and understanding of the door and window system. Especially the design and selection of profile size.
It can be said that without good profiles as the cornerstone, no good doors and windows can be made with any kind of hardware. The selection of profiles and hardware should be considered comprehensively, and be careful not to select the profile before choosing the hardware. This situation sometimes leads to the lack of matching hardware due to non-standard profiles.
Now most real estate developers will consider the fit of profiles and hardware before making a decision. The selection of accessories should consider its versatility and rationality, as well as the craftsmanship and material quality of the accessory production.
5.How does the door closer adjust the closing force?
step one:
The door closer can only be installed on the upper part of the door leaf close to the hinge. The end of the body with the speed-adjusting screw faces the hinge. Otherwise, the door will not open normally. If it is opened forcibly, the door closer, door leaf and upper door frame will be damaged. , Use four screws to fix the body on the door leaf, then put the lever into the upper end of the gear shaft, install the cap on the other end, and tighten the fastening screws.
Step two:
Install the connecting rod and use two screws to fix the connecting rod on the door frame. The hand-held connecting rod is at right angles to the upper door frame. Loosen the lock nut, adjust the connecting rod to a suitable length, gently move the lever so that the lever pin is inserted into the hole at the end of the connecting rod, and check that the connecting rod is at right angles to the upper door frame. Put on the washer and fasten it with the round head screw. Tighten the nut and the installation is complete.
Step three:
Adjusting the door-closing speed The door-closing speed has been adjusted. If you need to change the speed, turn the speed-adjusting screw as shown in the figure.
6.The structure and principle of the built-in door top door closer
(1) Structure: The built-in door top spring is composed of a hydraulic buffer spring installed on the door leaf, a slideway, a slider and a link installed on the door frame. Since the built-in top door closer is installed in the slot of the door leaf and the door frame, it does not affect the appearance of the door when the door is closed. It is suitable for the door of high-end hotel guest rooms.
(2) Principle: The hydraulic buffer spring gives the link a restoring moment, which causes the link to rotate away from the hinge, thereby driving the slider to move away from the hinge in the slideway at the same time to achieve the purpose of closing the door. There is a temporary locking card at the front end of the slideway. When the door leaf is opened to the right-angle position, the sliding block moves to the side close to the hinge, and the locking card is inserted into the tongue-shaped groove at the front end of the sliding block, so that the door is temporarily locked in this position.
7.What problems should be paid attention to when adjusting the closing force of the door closer?
(1) Exterior door top door closers are not suitable for two-way opening doors.
(2) The speed adjusting screw controls the opening and closing speed of the door. Clockwise rotation is slow, counterclockwise rotation is fast.
(3) Other screws and sealing parts should not be twisted at will to prevent oil leakage.
