Injection molding machine pull rod

Abstract

The invention discloses an injection molding machine pull rod. The injection molding machine pull rod comprises a pull rod body, a stress outer thread section arranged at the middle portion of the pull rod body, a piston arranged on the pull rod body in a sleeving manner and connected with the outer thread section in a threaded fit manner, and a piston positioning piece arranged between the pull rod body and the piston for positioning the piston. The piston and the outer thread section are connected through a thread, the thread serves as a stress part, multiple circles of screw teeth are stressed, so that a connecting part is stressed in a more balanced manner, stress concentration is avoided, and pull rod fractures are prevented. After the pull rod body and the piston are connected through the thread, a connecting structure of the pull rod body and the piston is provided with the piston positioning piece for achieving the positioning and orienting functions, the direction and the position of the piston are locked, piston rotation is prevented, the stability of the connecting structure is improved, and piston sliding and disengaging caused by high-frequency actions are avoided. Thus, the connecting relation of the piston and the pull rod body is stable, stress is balanced, and therefore the matching precision and the durability of a pull rod assembly are improved, and many economic losses are avoided.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to an injection molding machine pull rod with a piston orientation and positioning device. Background technique [0002] Injection molding machine tie rod, also known as clamping piston rod and Gelin column, is an accessory component used for guiding the moving template of the injection molding machine and locking it with the fixed template. During the operation of the injection molding machine, it is powered by the injection molding machine pull rod The movement of the movable platen makes the mold close and open, which plays a pivotal role in the process of completing the injection molding. [0003] see figure 1 As shown, the existing pull rod of injection molding machine includes a pull rod body 11, which is provided with an annular boss 12 for supporting the shoulder structure of the piston 13, and one end surface of the ring boss 12 forms a piston supporting surface. ...

AI Technical Summary

Problems solved by technology

[0004] Since the conical surface 14 where the piston 13 is in contact with the annular boss 12 forms a certain angle with the central axis L of the tie rod body 11, stress concentration is easily formed at the joint E between the tie rod body 11 and the conical surface 14. When the piston 13 moves along the direction of the arrow D When moving, the force F will make the joint E between the tapered surface 14 and the tie rod body 11 easy to break

At the same time, the movable template may be slightly deformed when the mold is closed, and the tie rod body and the piston will also be compressed and deformed when the mold is closed. The frequent injection molding process causes the tie rod to be stressed locally beyond the limit frequently, which leads to cracks at the root of the tie rod's conical surface and the tie rod breaks

The breakage of the tie rod will inevitably lead to production interruption and cause huge economic losses to users

[0005] In addition, since the tapered surface 14 is the contact surface between the rod body 11 and the piston 13, the high-frequency injection molding rhythm causes frequent deformation of the rod body and the piston, so the insufficient matching precision of the contact surface will cause the piston to jump and produce noise, so it is processed High precision requirements, high difficulty coefficient and high cost

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