QB/T 2453.2-1999 Children's beds and folding cots for domestic use Part 2: Test methods
Some standard content:
QB/T 2453.2--1999
This standard is based on the international standard ISO7175-2 "Children's beds and folding cribs for domestic use Part 2: Test methods" issued by the International Organization for Standardization in 1997, and is equivalent to it in terms of technical content and writing style. Under the general title of "Children's beds and folding cribs for domestic use", it includes the following two parts: Part 1 (QB2453.1): Safety requirements, Part 2 (QB/T2453.2): Test methods This standard was proposed by the Industry Management Department of the State Bureau of Light Industry. This standard was initiated by the technical unit of the National Furniture Standardization Center, Shanghai Furniture Research Institute. The main drafter of this standard is Shen Yanxiong.
QB/T2453.2--1999
ISO Foreword
ISO (International Organization for Standardization) is a worldwide joint organization of national standardization bodies (ISO member bodies). The drafting of international standards is normally done by ISO technical committees. Each member body interested in a subject identified by a technical committee has the right to be represented on that committee. International organizations, governmental and non-governmental bodies in liaison with ISO, also participate in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) in all fields of electrotechnical standardization. Draft international standards adopted by ISO technical committees are circulated to their member bodies for voting. Publication as an international standard requires approval by at least 75% of the member bodies voting. International Standard ISO 7175-2 was prepared by Technical Committee ISO/TC 136 "Furniture", Subcommittee SC 5 "Household furniture". This second edition of this standard, as technically revised, cancels and replaces the first edition (ISO 7175-2: 1988). ISO 7175, under the general title "Cribs and folding beds for domestic use", consists of the following parts: Part 1: Safety requirements; Part 2: Test methods.
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1 Scope
Light Industry Standard of the People's Republic of China
Children's beds and folding beds for domestic use
Part 2 Test methods
This standard specifies the test methods for assessing the safety of children's beds and folding beds for domestic use. QB/T 2453.2
idt ISO 7175-21997
This standard applies to children's beds and folding beds with an internal length between 900 mm and 1 400 mm and designed to prevent children from climbing out. This standard does not apply to cradles and hammocks. The tests in this standard apply to finished products that are fully assembled and ready for use. Note: The test results are valid only for the test pieces. If the test results are intended to be applied to other similar products, the test sample should be representative of the production type. If the design of the product is not suitable for this test procedure, the purchase test should be carried out as far as possible in accordance with the prescribed procedure and the differences from the procedure of this standard should be recorded. 2 Reference standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T6031-1985 Determination of international hardness of vulcanized rubber (30~85IRHD) Conventional test method Note: This standard is equivalent to ISO48, which has been revised in 1994. GB/T10807-1989 Test method for indentation hardness of flexible foam polymer materials QB2453.1-1999 Children's beds and folding beds for domestic use Part 1: Safety requirements 3 General requirements
All forces should have an accuracy of ±5%, all masses should have an accuracy of ±0.5% and all dimensions should have an accuracy of ±0.5mm.
Before starting any test specified in this standard, the product should be stored long enough to ensure that it has developed maximum strength. For products with adhesive joints, they should be stored in a standard indoor environment for at least 4 weeks between manufacturing and testing. Before testing, the fabric used for folding cots should be cleaned or washed twice according to the manufacturer's instructions. Immediately before testing, the product should be stored in a standard environment with a temperature of (23 ± 2) ° C and a relative humidity of (50 ± 5)% for at least 1 week. The product should be tested in the original state as supplied. If it is detachable, it should be assembled according to the instructions provided with the product. If the product can be assembled or combined in different forms, the most unfavorable combination should be used in each test. The tests should be carried out sequentially on the same test sample
Disassembled hardware accessories should be tightened before testing and should not be re-tightened during the entire test. 4 Test equipment
Unless otherwise specified, the test force may be applied by any suitable device, because the test results depend only on the correct force and loading, not on the equipment.
4.1 The slide gauge
is composed of a conical head made of plastic or other hard and smooth material, which is mounted on a force measuring device (see Figure 1). Approved by the State Bureau of Light Industry on July 12, 1999
Implemented on January 1, 2000
QB/T 2453. 2
—1999
The diameter of the conical head should be 7, 25, 45, 60, 65 and 85 mm. Diagram of measuring conical head
4.2 The bottom impactor
has a total mass of 10 kg and is made of hardwood or similar material. The dimensions are as specified in Figure 2. Figure 2 Bottom impactor
4.3 The test cushion
is composed of a soft ether-type foam sheet with a thickness of 50 mm. The bulk density of the foam is (30 ± 2) kg/m2. According to 8.2 of GB/T10807-1989, its indentation hardness index is (170 ± 20) N. During the test, the test cushion should have an area of at least 400 mm x 800 mm, but not larger than the mattress base of the crib. The test cushion should have a cotton cover with the following characteristics:
Plain weave: 1/1;
Mass per unit area: 100 g/m2 ~ 120 g/m2; Set warp and weft: 2030 strands per centimeter; Finishing: desizing, washing, no finishing agent; Cover sewing: close fit, but at the same time not constraining the foam. 4.4 Dynamometer
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For example, a spring scale.
4.5 Side panel impact pendulum
QB/T2453.2--1999
It consists of a steel cylindrical pendulum (see Figure 3), the head of which is covered with a 10 mm thick layer of rubber, and the rubber hardness is (76~78)IRHD as specified in ISO48. The center of gravity of the side panel impact pendulum should be 250 mm from the center of the swing point A. The impact point should be 300 mm from the swing point. Its total mass should be 2 kg.
Rubber, hardness 76~78IRHD
Figure 3 Side panel impact pendulum
4.6 Test load
It consists of a 20 kg mass evenly distributed on an area of approximately 150 mm×150 mm. The mass can be composed of more than one block. 4.7 Loading pad
It consists of a rigid cylindrical object with a diameter of 100 mm, a smooth and hard surface and a peripheral fillet radius of 12 mm. 4.8 The stopper
is intended to prevent the test piece from sliding, but not from tipping over. Its height shall not be greater than 12 mm, except where a higher stopper is necessary due to the design of the cot. In this case the lowest height which prevents the cot from sliding shall be used. 4.9 The floor
surface shall be level, hard and flat.
4.10 The test chain
consists of a chain of balls with a diameter of 3.2 mm and a centre-to-centre distance of 4.0 mm (see Figure 4). The chain of balls shall be fixed to a ball of mass 2.5 kg and diameter 115 mm and: a) arranged in a loop as shown in Figure 5; b) fixed at one end to a device made of stainless steel and having a total mass of (50 ± 1) g as shown in Figure 6a). 207
4.11 Cylinder
Ball chain
QB/T 2453.2-1999
Figure 4 Ball chain
2. 5kg ball
Fixed point
Test chain with ring
2.5kg ball
Ball chain
Fixed point
a) Test chain with disc
b) Disc
Figure 6 Ball chain with disc
Used to evaluate small parts, its main dimensions are shown in Figure 7. 4.12 Magnetic code
Its mass is 10kg and its cross section is 100mm×30mm. 208
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5 program
5.1 Assembly and inspection before testing
QB/T 2453.2--1999
p 31. 7 -0.
Assemble the crib according to the manufacturer's instructions. Before testing, visually inspect the crib for defects and tighten all detachable hardware accessories.
5.2 Processing quality inspection
Inspect the exposed edges, screws, latches, zippers and other hardware accessories of the crib for rounding or chamfering, burrs and cutting edges. 5.3 Measurement
5.3.1 Measurement of side panel height
Measure the inner height of the side panel after removing the cushion from the crib surface in the lowest position, or measure the minimum distance from the side panel part where a child can stand.
5.3.2 Measurement of the holes and distance between the slats of the crib surface, the slats of the side panel, the mesh width, and the gap between the crib surface and the side panel or the head of the bed.
Measure the gaps between the slats of the crib, between the slats of the side panels, between the wires of the mesh, and between the crib cover and the side panels or headboard under the load given in Table 1. Measure the gaps again when there is no load. Press the slide gauge (4.1) between the wires of the mesh, between the slats of the crib cover, between the slats of the side panels, and between the crib cover and the side panels or headboard with the force given in Table 1. After removing the force, measure the maximum inner width of the mesh openings. Table 1
Wire mesh of side panels and headboard
Crib cover/side panels, headboard
Aperture, gap between structural parts
Slats of crib cover
Aperture, gap between structural parts
Wire mesh of crib cover
Cone head diameter and force used
Cone head diameter, mm
4. 3 of QB2453.1-1999.
4. 4 of QB2453.1-
—1999
5.3.3 Inspection of protruding parts, gaps and recessed holes QB/T2453.2-1999
Make the crib cover in the lowest position. Parts of the crib side panels and headboard that are more than 1400 mm above the crib surface are considered to be inaccessible.
Using only one hand, pass the loop of the test chain [4.10a) from the inside of the crib around the protruding part and allow the ball to hang freely. Repeat this test three times.
Record whether the loop becomes caught in any position under the load of the ball. Then, still using only one hand, hold the ball so that the chain next to the fixed point contacts the highest part of the crib side panels and headboard, while moving the test chain [4.10b)] around the crib. In any position where the chain can be caught, lower the ball until the disc is caught and the ball hangs freely, or the disc slides over the edge. Where possible, insert the disc through the accessible recess and lower the ball in the same way as above. Repeat this test at least three times.
Record whether the disc becomes caught in any position under the load of the ball. 5.4 Disassembled parts
Note: Parts are considered disassembled if they can be bitten or held by the child's teeth or fingers. Apply a tensile force to the test part with a clamp or other suitable tool. The applied tensile force is:
50N for the largest accessible dimension less than or equal to 6mm; 90N for the largest accessible dimension greater than 6mm. Apply the tensile force gradually within 5s and maintain it for 10s. If the part is disassembled, check whether the part is completely installed in the cylinder (4.11). 5.5 Strength of crib surface (impact test)
Place the test cushion (4.3) flat on the crib surface. Drop the bottom impactor (4.2) 150mm above the crib surface at a rate of not more than 30 times per minute, and impact each selected impact position on the test soft body 1000 times. The impactor should fall freely. Note: It is recommended to use a set of guide rods (to guide the impactor). Remove the test cushion (4.3) and check whether parts of the crib cover have broken or whether the crib cover has become loose due to its fastenings.
When the impactor alternates between the impact points, it shall not impact the cushion at the same place. Each test cushion shall be used for no more than 5 test pieces.
The impact pads shall be points a to f as shown in Figure 8, which are defined as: a: any corner,
b: any part of the bottom that appears to be the weakest, or (if no clear weak point can be selected) the diagonally opposite corner of point a; c: the midpoint of one side;
d: the midpoint of an end,
e: the center of the crib cover, and in addition,
f: if the crib cover can have more than one high position, and if its supporting structure is different for different positions, the cover is in the highest position, but only at the two untested opposite corners. At points a, c, d and f in Figure 8, the horizontal distance between the side of the impactor and the inner surface of the frame should not be greater than 50 mm. 210
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5.6 Strength of side panel slats (bending test)
QB/T 2453.2—1999
Figure 8 Impact points
Place the crib on the ground and fix all the legs with blocks (4.8). Prevent the crib from tipping over. 50
Use a suitable dynamometer (4.4). Apply a force of 250 N alternately to the middle and end-root side panel slats of each side panel. The force should be applied horizontally in the direction of the longitudinal and transverse axes of the crib. The force should act on the midpoint between the top and bottom of the slats. The pressure should be maintained for 30 s.
Record any breakage or deformation of the slats and any other damage. After the force is removed, measure the permanent deformation of each side panel slat. 5.7 Strength of side panels or side panel slats (impact test) Place the cot on the ground and fix all legs with stops (4.8). Prevent the cot from tipping over. Install the side panel impact pendulum (4.5) so that the impact pendulum impacts the side panel slats or side panels from both inside and outside at a height of 200 mm below the top edge of the side panel (see Figure 9).
a) Side view
Figure 9 Side panel impact test
b) Front view
One slat shall be impacted from the outside and the next from the inside, alternating between them. The test shall be carried out first from the outside and then from the inside. bZxz.net
When the cot to be tested has a one-piece side panel, the impact pendulum shall impact 10 evenly distributed locations on the long side panel and 4 evenly distributed locations on the head side panel, with the impact direction being alternating from the inside to the outside of the cot. Allow the impact pendulum to swing freely from a horizontal position to the side panel slat or side panel. Repeat 10 times, then move the impact pendulum to the next slat or the next impact point. The test is continued until all slats or all pre-selected impact points have been tested. 211
QB/T 2453.2—1999
Mount the impact pendulum to impact the side panel frame as high as possible and as close to the corner post as possible (see Figure 10). Allow the impact pendulum to swing freely at an angle of 60° to the vertical. This process is carried out for the side panel components at each corner of the crib, that is, each position is impacted 5 times from the inside of the crib and 5 times from the outside of the crib.
Record any breakage or deformation of the slats and any other damage. After the force is removed, measure the permanent deformation of each side panel slat. a) Side view
5.8 Strength of frame and fasteners
5.8.1 Vertical static load test
Figure 10 Angular impact test
b) Front view
As shown in Figure 11, load the top of the crib side panel 10 times with a vertical downward force Fsv of 300N. Each load should be maintained for at least 10 seconds.
All side panels and headboards of different structures should be tested. Any cracks or deformations and any other damage should be recorded. Fs
Figure 11 Vertical static load test
5.8.2 Strength of frame and fasteners (durability test) Place the crib on the ground and fix all the legs with blocks (4.8). Place the test load (4.6) in the center of the bottom of the crib. 1/4
Apply a force of 100 N through a loading pad (4.7) and a device that can pressurize the crib in four horizontal directions, two forces opposite to each other in the longitudinal direction and two forces in the transverse direction (AB/CD) [see Figure 12a)]. The force should be applied in the order of A, B, C, D or A-B followed by C-D (equal to one cycle) for 2000 cycles, and each load should increase from 0 to 100 N and return to 0 in a time of not less than 1.
Force application points (A, B, C,D) should be located 50 mm from the intersection of the centerline of the side panel members, with the highest point at this position as shown in [Figure 12b)1.
Record any damage, looseness or detachment of hardware accessories or fasteners. A
Figure 12 Durability test
5.9 Stability test
The cot should be tested without the soft mattress, unless the soft mattress is an integrated and fixed part of the cot. Place the cot on the ground and fix all the legs with stops (4.8). The tendency to tip over should not be stopped. For cots with castors, place the castors in the most unfavorable position. Fix the cot cover in the highest position.
Apply the foot weight (4.12) to the inside of the midpoint of the side edge of the cot side panel (see Figure 13). Then apply a force of 30N horizontally outwards. Record whether one or more legs on the opposite side are lifted off the ground. 213
5.10 Test of locking mechanism
5.10.1 Static test
Assemble the crib according to the manufacturer's instructions.
QB/T 2453.2—1999
Figure 13 Horizontal stability
Place the crib on the ground and fix all legs with stops (4.8). The tendency to tip over should not be checked. Apply a force of 200 N in the least folding direction (or directions) and try to fold the crib. This force should be applied 5 times, each time for 2 min.
5.10.2 Dynamic test
Operate (close and open) the locking mechanism 300 times. Measure the force required for operation. For rotating parts, measure the tangential force. 5.11 Castor or roller brake
Set the castor or roller brake in the locked state. By observing and turning the crib once, check whether the wheel brake stops the casters or rollers from rolling, or whether it can be opened. "
6 Test report
The test report should include at least the following: a) Implementation standard number;
b) Description of the tested crib (relevant data); c) Description of the delivery status of the test piece;
d) Test results according to 5.1~～5.11; e) Compliance with the requirements of QB2453.1,
f) Details of any deviation from this standard;
g) Name and address of the test organization;
h) Test date.
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