Japanese steel drum sealer and structural improvement
Nanjing Yangzi Barrel Factory Zhang Lianyuan
Last year, when we studied the JIS Z1601-1986 200-liter closed steel drum structure produced in Japan, we found that the closure coil structure printed with the Japanese national standard mark was improved. This is a significant improvement in the sealing structure since the invention of the closure. After the improvement, it is beneficial to improve the impact resistance and leakage resistance of the steel drum. The following are some preliminary understandings of our factory, for reference by the peers in the barrel industry.
Figure 1 shows an improved type of coil produced in Japan in 1990. The new coil structure is basically the same as the Japanese industrial standard JIS Z 1604-1984, except that a boss is pressed on the octagonal side of the coil to form an annular groove at the joint of the outer circle of the coil and the octagonal side. , while the thickness of the octagonal edge remains unchanged.
Figure 1 Improved coil
1-sealing groove; 2-positioning boss; 3-process groove
Fig. 2 is a sectional view of the installation of the sealing ring before the screw ring lock, that is, a flat sealing ring with a low hardness and a relatively good elasticity is placed on the octagonal edge of the spiral ring, and then a higher hardness is placed on the upper side of the spiral ring. Rectangular seal ring.
Figure 2 Sealing ring installation diagram
1-Rectangular seal; 2-flat seal; 3-bar top; 4-coil
Figure 3 is a cross-sectional view of the spiral lock. It can be seen from the figure that: 2 seals with different hardnesses become a V-shaped seal under the action of the pressing force, the hardness is small outside the groove, and the hardness is close to the joint of the groove and the coil.
Figure 3 Helical lock profile
Through analysis, we believe that the improved coil has three advantages:
1. The pre-pressure of the coil is even. After the lock is installed, the sealing ring stretches along the inner cavity of the spiral groove, and the top of the barrel is pressed against the spiral boss to make the spiral groove become a closed space, and the sealing member acts on the pressing force. The lower part can only be diffused and contracted in the groove space, thereby forming a sealing ring with uniform pre-pressure and maximum joint surface. When the sealer is subjected to external force or wrench torque, a gap is formed between the coil and the top of the bucket due to deformation. Under the pre-pressure, the seal ring uses its good follow-up deformation property to rapidly expand and compensate for the new space formed by the deformation. , to ensure that no leakage.
2. The sealing principle is advanced. Since the seal is composed of two materials with different hardening properties, when the vapor pressure of the contents of the steel drum rises under the influence of the ambient temperature (within the safety tolerance of the steel drum), the hardness of the vapor pressure is small. The sealing ring produces elastic deformation, which is close to the top of the bucket and the coil. This method of using the elastic deformation of the sealing ring to prevent leakage is close to the principle of the V-shaped seal on the modern hydraulic device.
3. High precision. Since there are grooves on the octagonal side of the coil, when the lock is installed, when the top edge of the barrel is pressed against the octagonal side of the barrel, a downward direction is generated, and the center of the coil is contracted. After the lock is installed, the top of the bucket above the groove protrudes slightly downward, so the boss and the groove on the coil have a positioning function and increase the mechanical strength of the seal. The top turn of the barrel shrinks and closes to the coil, thereby improving the matching precision and leakage resistance.
In the construction of the sealer material, the Japanese counterparts are not bound by the traditional habits, but choose the seal material according to the specific conditions of the sealer. For example, the seals at the joint between the coil and the top of the bucket have good follow-up deformation performance. They use rubber with good elasticity that suits the contents; the seals that require the joint between the coil and the barrel are resistant to twisting and have a certain hardness. They use polyethylene instead of rubber or inner and outer rings. All use plastic. This improvement is very good for improving the sealing performance of the steel drum.
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