Spring pin, also known as elastic cylindrical pin, is a headless hollow column shape, axially slotted, with chamfer at both ends, used for positioning, connecting, fixing and so on between parts.
The spring pin must have good elasticity and shear resistance, and the outer diameter of this kind of pin is slightly larger than the assembly aperture. It is used for vibration and other parts that do not require high precision positioning (used when cylindrical pins and conical pins cannot be used).
Spring pin classification 1, elastic cylindrical pin 1) Light elastic cylindrical pin 2) Heavy elastic cylindrical pin light and heavy the main difference is the thickness of the material and the width of the chamfer, heavy spring pin material thickness and the width of the chamfer are larger than the light. 2, elastic cylindrical pins with teeth 1) light elastic cylindrical pins 2) heavy elastic cylindrical pins and ordinary elastic cylindrical pins are similar in appearance, the difference is that the axial slot is staggered wave tooth shape. 3, roll elastic cylindrical pin 1) light roll elastic cylindrical pin 2) heavy roll elastic cylindrical pin
The tail column needs to be positioned in the front and back directions (X) and up and down directions (Y) at the same time. We have reformed the positioning device of the tail column, and changed the installation sequence of the parts. The standard positioning pin is changed into an elastic pin composed of a number of parts such as special-shaped pin, spring and outer steel sleeve. The spring is placed in the area between the lower step of the special-shaped pin and the outer steel sleeve, and the upper limit nut is screwed on the lower part of the pin to limit the position of the special-shaped pin. When the pin is subjected to external pressure, the spring will be compressed, and the pin will move down along the axis of the bushing and retract into the bushing; When the special-shaped pin is aligned with the hole of the part, the pressure disappears, and the pin pops out again, finally playing the role of positioning. The improved positioning device is shown in the figure below. At this time, change the installation sequence of the tail column, first extend the cylinder pin, and then put the part in, and position it in the front and rear direction (X direction) of the assembly table. At this time, if the tail column is not installed in place, the part is positioned in the positioning hole and spring pin in the Y direction Without alignment, the spring is in a compressed state, and the spring pin is in a retracted state, but when the tail post is installed in place, the positioning hole is aligned with the spring pin, and the spring pin will automatically pop out from the positioning hole, positioning the part in the upper and lower direction (Y direction) of the table, and then close the fixture of the part. In this way, under the premise of ensuring the accurate installation of the tail column, the problem of parts being pushed out by the cylinder pin during the installation process is avoided, the installation time of parts is greatly shortened, the production beat is improved, and the problem of parts being deformed by the cylinder pin is avoided.
Spring pin short rope protector is one of the most commonly used equipment in building construction. However, in use, the accident of the hanging basket falling due to overload often occurs, which directly poses a threat to the safety of the construction personnel. In order to eliminate this unsafe factor, the defects existing in the structure of the original broken rope protector are improved, and the spring pin type broken rope protector is developed. This protector has the characteristics of simple structure, easy production, convenient installation and strong reliability.
Its working principle is: when the door hoist wire rope is broken, because the pressure on the spring disappears, the spring tension will pop out the cross pin, stuck in the steel frame of the derrick, so as to prevent the basket from falling after many tests, Load 1 to 2 tons of load in the lifting basket, when the lifting basket rises to the height of four floors, the door lifting wire rope is immediately released, and the protective device is flexible and accurate, and the lifting basket is firmly fixed in place.
