CN211900318U

CN211900318U - Steel door core

Info

Publication number: CN211900318U
Application number: CN202020147911.8U
Authority: CN
Inventors: 杨照军; 刘文华; 庄文红
Original assignee: Zhuhai Hua Yan Wood Co ltd
Current assignee: Zhuhai Hua Yan Wood Co ltd
Priority date: 2020-01-23
Filing date: 2020-01-23
Publication date: 2020-11-10
Anticipated expiration: 2030-01-23

Abstract

The utility model relates to a steel door core for preventing fire door, it includes the square frame of a steel and locates two door core cover boards of both sides around the square frame, the square frame is formed through the rivetless riveting by long, short skeleton, one in the door core cover board through the rivetless riveting with square frame connects, another of door core cover board through the blind rivet with square frame rivets. The utility model has the advantages of simple structure and firm, make things convenient for assembly line volume production operation.

Description

Steel door core

Technical Field

The utility model relates to a fire-resistant building opening closing device's part, specifically relate to a steel door core for preventing fire door leaf.

Background

The existing door core for the fireproof door has the advantages that the structure is complex, simple and greatly different, all the parts are connected by virtue of spot welding or screws, and partial products are spliced. The strength of spot welding and screw connection can meet the requirement, but the manufacturing process is more complicated, and the assembly line mass production is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, firm steel door core that just is applicable to streamlined production.

In order to achieve the purpose, the steel door core provided by the utility model comprises a steel square frame and two door core cover plates arranged at the front side and the rear side of the square frame, wherein the square frame is formed by long and short frameworks through rivet without nails; one of the door core cover plates is connected with the square frame through rivet-free riveting, and the other of the door core cover plates is riveted with the square frame through a rivet.

It is obvious by above-mentioned scheme, the connection between the steel door core part mostly adopts the rivetless riveting, and the part is unsuitable to adopt the rivet riveting in the rivetless riveting place, because the rivetless riveting technique is cold connection, does not destroy the crystalline phase structure of metal, and the dynamic strength of rivetless riveting point is superior to the spot welding, so the utility model discloses the firm degree of steel door core is more excellent relatively. Because the rivetless riveting can be accomplished in short time with the riveting mould, in addition the simplified design of square frame and door core apron, so the utility model discloses the steel door core is applicable to the streamlined operation of modernization.

Drawings

FIG. 1 is a longitudinal side view of a steel door core of the present invention.

Fig. 2 is a partially enlarged view taken along a-a in fig. 1.

Fig. 3 is a partially enlarged view taken along B-B in fig. 1.

Fig. 4 is a schematic diagram of a square frame.

Fig. 5 is a cross-sectional view of the square frame of fig. 4 taken along line a-a.

Fig. 6 is an enlarged view of a portion of the rivet point of fig. 5.

Figure 7 is a schematic view of the square frame of the figure after riveting a door core cover plate.

Fig. 8 is an enlarged view of a portion of the rivet joint between the square frame and the door core cover of fig. 7.

The present invention will be further explained with reference to the drawings and examples.

Detailed Description

The door core is a core part of the door leaf and is located at the center of the door leaf. Unless otherwise specified, the following description of the orientation is based on the vertical state of the door leaf when in use.

FIG. 1 is a longitudinal side view of a steel door core of the present invention. Referring to fig. 1, a steel door core 20 includes a steel square frame 21 (described in detail later), two door core cover plates 4 disposed at front and rear sides of the square frame, and an inner core material 5 (fig. 2) filled therein and having a heat insulation and fire prevention function. The inner core 5 is preferably a perlite board having high strength and fire resistance.

The steel door core 20 is a cubic closed solid door core. The square frame 21 forms its periphery and the door core panel 4 forms its front and rear faces.

In this embodiment, the door core cover plate 4 is made of 0.8mm galvanized sheet. The door core cover 4 has a right-angled bead, which is used primarily for its connection to the square frame.

Fig. 2 is a partially enlarged view taken along a-a in fig. 1. Fig. 3 is a partially enlarged view taken along B-B in fig. 1. Fig. 2 and 3 show only one side of the door core, since the door core is substantially left-right symmetric.

Referring to fig. 2, one of the door core cover plates 4 is connected to the square frame 21 by a nailless rivet, with a plurality of rivet points 24 therebetween. Referring to fig. 3, another door core cover plate 4 is riveted to the square frame 21 by a plurality of pull nails 7. The blind rivet 7 is made of steel blind rivet with the diameter of 4.0 mm.

Referring to fig. 4 to 6, the square frame 21 is formed by a pair of long frames 2 and a pair of short frames 3 by clinch-riveting without nails. The long framework is made of 1.5mm galvanized sheet, and the short framework is made of 1.0mm galvanized sheet. The long framework 2 has a U-shaped cross section, three sides of which are closed when viewed from the side, and a fourth side of which is open; the short frame 3 has a U-shaped cross section with two internal curled edges on two sides, and is partially opened on the other side when viewed from the side. The design of the internal bead can further increase the structural strength of the profile.

The end of the short framework 3 is embedded in the end of the long framework 2, and the overlapping or embedding area of the two is an area without rivet riveting. This region corresponds to the four corners of the square frame 21. At each corner of the square frame 21, a rivet-free point 23 is formed on each of the front and rear surfaces. The riveting point 23 is a sunken circular interlocking reverse buckle directly formed on the long and short frameworks by a nail-free riveting means. Because the door core cover plate 4 wraps the square frame 21 from the front side and the rear side, the riveting points 23 are all covered by the door core cover plate 4, so that the appearance of the door core is more beautiful.

Referring to fig. 7 and 8, the first door core cover plate 4 is connected to the square frame 21 by a rivetless riveting, specifically, the riveting point 24 of the door core cover plate 4 and the square frame is located on the outer peripheral side of the square frame 21, i.e. the bottom of the U-shaped groove of the long frame 2, and is located above the curling edge of the door core cover plate 4. The rivet 24 and the rivet 23 are on different surfaces, and stress concentration can be avoided.

Door core apron 4 is the several with square frame 21's riveting point 24, and the interval is about 300mm, at the riveting in-process, will avoid the position of lock body position and hinge stiffening plate, guarantees door core apron and the unilateral 7 to 8 riveting points of square frame 21, guarantees square frame and the unilateral joint strength 600KG of core apron.

The U.S. BTM round dot non-nail riveting 4.6mm series female die split structure die is selected as the non-nail riveting die. Under the condition of not damaging the riveting point, according to the tensile and shear failure test of the riveting point with different bottom thickness values, the applicant obtains that the connection strength state of the nailless riveting point reaches the maximum value within the range of 1/3 +/-15 percent of the bottom thickness value (X) of the riveting point as the material combination thickness.

In this embodiment, the combination of the nailless riveting materials composed of the thicknesses of the materials is a combination of two materials, namely, 0.8+1.5 and 1.5+ 1.0. And (3) manufacturing two groups of material combined nail-free riveting samples, adjusting the input pressure of a hydraulic cylinder, and controlling the bottom thickness value (X) of the riveting point within a range of the thickness of the material combination to carry out tensile and shear strength failure test. The strength reaches a maximum when the rivet point bottom thickness (X) is controlled to 1/3 ± 15% of the combined material thickness. Through experiments, the tensile strength of the 0.8+1.5 material combination reaches more than 90KG, and the shear strength reaches more than 110 KG; the tensile strength of the 1.5+1.0 material combination reaches more than 100KG, and the shear strength reaches more than 120 KG. Therefore, the manufactured steel door core has high firmness.

The steel door core 20 is connected by full riveting, so that the related traditional operations such as welding, screw connection and the like are avoided, and the production line processing with faster rhythm is facilitated.

Claims

1. The utility model provides a steel door core, includes the square frame of a steel and locates two door core cover boards of both sides around the square frame, its characterized in that:

the square frame is formed by long and short frameworks through rivet-free riveting;

one of the door core cover plates is connected with the square frame through rivet-free riveting, and the other of the door core cover plates is riveted with the square frame through a rivet.

2. The steel door core of claim 1, wherein: the riveting points between the long framework and the short framework are positioned at the front side and the rear side of the four corners of the square framework and are covered by the door core cover plate.

3. The steel door core of claim 1, wherein: the long framework, the short framework and the door core cover plate are made of galvanized plates.

4. The steel door core according to claim 1, said nailless clinch forms a clinch point having a bottom thickness value (X) of one third of the combined thickness of the clinching material, allowing variation in the range of values up to and down to 15%.

5. The steel door core of claim 2, wherein: the long framework is provided with a U-shaped cross section, the short framework is provided with a U-shaped cross section with an inward curled edge, the end part of the short framework is embedded in the long framework at the corner part of the square framework, and the riveting point between the long framework and the short framework is positioned in the embedding area between the long framework and the short framework.