This standard specifies the safety technical requirements for wood processing circular saws, including general requirements and requirements for safety guards, dividers, backstops, circular saw blades, ergonomics, industrial hygiene, etc. This standard applies to wood processing circular saws and circular saw parts on various production lines. GB 16272-1996 Safety Technical Requirements for Wood Processing Circular Saws GB16272-1996 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Safety technical requirements for woodworking circular saw bench
Safety technical requirements for woodworking circular saw bench1Subject content and scope of application
GB 16272 -- 1996
This standard specifies the safety technical requirements for woodworking circular saw benches, including general requirements and requirements for safety guards, dividing knives, backstops, circular saw blades, ergonomics, industrial hygiene, etc. This standard applies to woodworking circular saw benches and circular saw components on various production lines. 2 Reference standards
GB 2894
Safety signs
General technical conditions for electrical equipment of machine tools
GB52267
GB12557 General safety rules for woodworking machine tool structures
GB/T13573 Woodworking circular saw blades
GB/T14388 Woodworking carbide circular saw blades
3 Terminology
3.1 Woodworking circular saw bench Mechanical equipment that uses circular saw blades as tools to saw wood. 3.2 Kerf
Also known as saw kerf. The space formed by the part of the wood that is cut into sawdust during sawing. 3.3 Kerf width
The theoretical sawing width is the thickness of the saw blade plus the protruding teeth (also called sawing material, often referred to as material; it is the part of the saw tooth tip protruding to the sides of the saw blade), and the actual sawing width is the width of the saw cut when the wood is sawed. 3.4 Antikickback devicesAn antikickback device prevents the wood from moving in the reverse direction of the feed direction during the sawing process. 3.5 Riving knife
A device set at the discharge end to reduce the compression of the wood on the saw blade and prevent the wood from rebounding. 4 General requirements
4.1 The rated speed of the saw shaft shall not exceed the maximum allowable speed of the circular saw blade (see Appendix A). 4.2 The circular saw blade on the circular saw machine must be equipped with a safety guard. 4.3 The workbench panels are generally arranged on both sides of the circular saw blade. The panels should be made of softer materials such as non-ferrous metals, plastics or wood, and can be replaced.
4.4 The width of the saw blade notch on the workbench is generally the saw path width plus 10mm, and the width of the saw path plus 15mm for the inclined saw. Approved by the State Administration of Technical Supervision on April 10, 1996 152
Implementation on October 1, 1996
GB 162721996
4.5 The transmission parts of the circular saw machine that may cause personal injury must be equipped with safety protection devices. 4.6 The saw blade must have the correct rotation direction, that is, the cutting force generated during rotation should be able to ensure that the sawed workpiece is pressed tightly against the supporting surface (workbench, baffle, guide plate, etc.).
4.7 Safety protection requirements for circular saws with longitudinal sectioning function 4.7.1 Manual feeding circular saws must be equipped with a dividing knife. 4.7.2 Automatic feeding circular saws must be equipped with a check valve, a material pressing device and a lateral protective baffle. The feed roller should be equipped with a protective cover. 4.7.3 The circular saw should be equipped with a guide plate. The fastening of the guide plate must be reliable. The guide surface should be smooth and continuous. The length and width of the guide plate must ensure the safe feeding of the workpiece.
4.8 Safety protection requirements for circular saws with cross-cutting function: 4.8.1 The circular saw should have a device to press or clamp the sawed workpiece. 4.8.2 The circular saw should have a device to limit the movement of the saw blade. When the saw blade moves toward the operator, it must not exceed the range of the workbench. 4.8.3 The circular saw should ensure that the saw blade can be forced back and stabilize in the original position. 4.9 The spindle, flange and other important parts of the circular saw machine must be precision inspected. The inspection items and precision requirements shall comply with the relevant standards. Circular saw machines that have not been inspected and do not have product certificates shall not be put into production. 4.10 The electrical system of the circular saw machine shall be implemented in accordance with the relevant provisions of GB5226. 5 Requirements for safety guards
5.1 The safety guards shall have sufficient strength, rigidity and correct geometric dimensions, and their protective functions must be reliable. The surface of the cover should be smooth and free of sharp edges, corners and burrs.
5.2 The safety guard should adopt a partially closed structure to facilitate the replacement of saw blades and the adjustment and maintenance of the saw machine. 5.3 The installation of the safety guard must be firm, reliable and correctly positioned, and its supporting connection parts must be The strength of the safety shield shall not be lower than that of the safety shield. After being fixed, the safety shield shall be able to withstand unexpected impacts or other forces. 5.4 The safety shield can generally be made of Q235 steel plate, or other materials with equal strength and rigidity. 5.5 The radial safety distance between the safety shield and the tip of the saw blade tooth should not be less than 40mm, and the axial safety distance should not be less than 35mm (Figure 1). 35bZxz.net
Protective oxygen
Circular saw blade
5.6 The distance X between the bottom edge of the safety shield body and the plane on the workpiece being processed is ≤10mm (Figure 2). 153
Material dividing knife
Workbench
GB16272—1996
Safety shield
Longitudinal sectioning for timber processing The safety guard of the circular saw machine should generally cover 1/3 of the height of the exposed circular saw blade on the upper part of the workbench, and should not be less than 1/5 at least.
5.8 When the saw blade cannot be covered with a safety guard for special reasons, a safety baffle (or curtain) should be installed above the saw blade, or other protective measures should be taken to ensure the safety of the operator.
5.9 The safety guard of the hanging circular saw machine and the universal rocker circular saw machine should be able to cover the upper part of the saw blade and the end of the saw shaft, and should be able to control the sawdust from being discharged in the direction of the operator. The exposed part of the lower part of the saw blade should not be greater than 10mm of the thickness of the workpiece. Where possible, the guard should be able to automatically adjust with the change of the thickness of the workpiece.
5.10 When the diameter of the saw blade is greater than 250mm, the safety guard should generally not be fixed on the slitting knife. 5.11 The safety guard should be equipped with a safety warning sign in accordance with the provisions of GB2894. 6 Requirements for slitting knives
6.1 The slitting knife must be installed firmly. The dividing knife must be symmetrical with the rotation center plane of the saw blade (Figure 3). The symmetry deviation △ value is shown in Table 1. Figure 3
Saw blade diameter
160~315
355~500
560~700
Symmetry △
6.2 The dividing knife blade is arc-shaped, and its arc radius should not be less than the radius of the circular saw blade. The distance between the dividing knife blade and the tooth tip should not be greater than 16 mm.
GB16272-1996
6.3 The highest point of the dividing knife should not be higher than the tooth tip of the uppermost tooth of the saw blade, and should not be lower than the tooth root of the uppermost tooth of the saw blade (see Figure 2). 6.4 The dividing knife should have sufficient width to ensure its strength and rigidity, and will not be bent or deviate from the normal working position after being subjected to force. 6.5 The dividing knife should be able to be adjusted up and down and forward and backward on the plane of the saw blade. When the saw machine uses saw blades of different sizes, the corresponding specifications of the dividing knife should be used.
6.6 The dividing knife should be made of high-quality carbon steel 45 or other steel with equivalent mechanical properties, and its hardness should reach HRC40~46. 6.7 The thickness of the dividing knife: when the saw blade diameter is less than 630mm, it should be greater than the saw path width by 0.5mm; when the saw blade diameter is equal to or greater than 630mm, it should be greater than the saw path width by 1mm.
6.8 The width of the sharpened bevel of the dividing knife should not be less than 5mm, but should not exceed 1/5 of the blade width. 7 Requirements for the backflow stop
7.1 The backflow stop must be flexible and reliable, and the backflow claws must be arranged compactly on the support shaft to ensure that the workpiece can be prevented from going backwards within the full range of sawing thickness and width.
7.2 The anti-return device must have sufficient strength, rigidity and impact resistance. The tip of the anti-return claw (Figure 4) must be sharp and wear-resistant. Its dimensions are as follows:
The hole and the support shaft are matched with clearance. The diameter d of the support shaft should be large enough to resist the impact force of reverse movement; a.
b≥d, L2≥d;
Li≥100mm. If L≥100mm cannot be guaranteed, its contact weight should be increased as much as possible or a sufficiently large contact angle α should be maintained (see Figure 5);
Direction of workpiece movement
t≥8 mm;
30°B≤60°
GB 16272-1996
7.3 Within the working performance range of the saw machine, with the adjustment of the machinery and the change of the workpiece thickness, the tip of the anti-return claw must maintain continuous contact with the surface of the workpiece being fed, and maintain a contact angle α of 65°~80°. 7.4 The anti-return device should not produce a large resistance to the feeding of the workpiece. After the workpiece passes, the anti-return claw must return to its position quickly. 7.5 The saw machine must be equipped with an anti-return claw over-travel limit device. 7.6 The anti-return claw shall be made of high-quality carbon steel 45 or other steel with equivalent mechanical properties. 8 Requirements for circular saw blades
8.1 The circular saw blades used in circular saw machines must comply with the requirements of GB/T13573 and GB/T14388. 8.2 Ordinary circular saw blades must be pressed or shifted before use and sharpened. 8.3 Ordinary circular saw blades should be subjected to tension treatment and balance inspection and adjustment before use. 8.4 When the circular saw blade breaks two teeth continuously or cracks appear, it should be stopped from use. 9 Requirements for ergonomics
9.1 The height of the saw machine workbench from the ground should be selected within the range of 800 to 850 mm. The preferred size is 850 mm. 9.2 The circular saw machine for timber processing should be equipped with an auxiliary workbench as required. 9.3 The requirements for the operating mechanism of the circular saw machine shall be implemented in accordance with the relevant provisions of Chapter 5 of GB12557. 10 Industrial hygiene requirements
10.1 Dust removal and chip removal
10.1.1 The removal of sawdust and dust should be considered when designing the circular saw machine. 10.1.2 The circular saw machine should be equipped with a reasonable and effective dust hood or dust suction interface, and fire prevention and explosion prevention should be considered. 10.1.3 If the dust hood also has a safety protection function, it should also comply with the relevant provisions of Chapter 5. 10.1.4 The method of removing sawdust and dust should be explained in the instruction manual of the circular saw machine, and relevant parameters should be provided. 10.2 Noise and vibration
10.2.1 The noise and vibration of the circular saw machine shall comply with the relevant provisions of Chapter 11 of GB12557. 10.2.2 When the noise of the circular saw machine used in production exceeds the standard requirements, noise reduction measures should be taken. 156
Saw blade diameter, mm
Additional instructions:
GB16272--1996
Maximum allowable speed of various circular saw blades
(Supplement)
Saw blade speed, r/min
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is drafted by the Harbin Forestry Machinery Research Institute of the Ministry of Forestry. The main drafters of this standard are Luan Ke, Lou Maoda and Xu Kesheng. Saw blade diameter, mm2
Saw blade speed, r/min
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