Multi-mold block drive device and injection molding machine having the multi-mold block drive device

An injection molding machine, comprising:

• a machine base;
• a feeding unit mounted on said machine base for feeding a linear material, and including a plurality of pull wheel assemblies spaced apart from each other along an axis, and a motor for driving said pull wheel assemblies;
• a material feed backflow prevention device mounted on said machine base and located on a side of said feeding unit for preventing backflow of the linear material during feeding;
• a multi-mold block drive device mounted on said machine base and located on a side of said material feed backflow prevention device, said multi-mold block drive device being suitable for driving a plurality of mold blocks, and including
• a guide seat including an inner peripheral surface surrounding an axis and defining a mold hole, an outer peripheral surface opposite to said inner peripheral surface, a plurality of spaced-apart mold grooves formed in said inner peripheral surface and communicating with said mold hole, and a plurality of spaced-apart guide holes each of which extends through said outer peripheral surface along a central line transverse to the axis and communicates with a respective one of said mold grooves, a plurality of drivers that are disposed spaced apart from said outer peripheral surface, that are positioned relative to said guide seat, and that correspond respectively to said guide holes, and a plurality of speed reduction units each connected between one of said guide holes and a corresponding one of said drivers, each of said speed reduction units including a guide screw rod that extends along the central line and that has a non-threaded portion connected to the corresponding one of said drivers and an externally threaded portion opposite to said non-threaded portion along the central line, a guide sleeve sleeved on said guide screw rod and having an internal thread facing said externally threaded portion, and a plurality of planetary screws parallel to said guide screw rod and interposed between said guide screw rod and said guide sleeve, each of said planetary screws having a drive thread meshing with said externally threaded portion and said internal thread, said guide sleeve of each of said speed reduction units being configured to be connected to a corresponding one of the mold blocks,
• wherein, when said guide screw rod of each of said speed reduction units is driven by the corresponding one of said drivers to rotate, said planetary screws are driven by said guide screw rod to rotate and move linearly along said externally threaded portion, and said guide sleeve is in turn driven by said planetary screws to move linearly therealong;
• and
• a pair of molds that are disposed in two opposite ones of said mold grooves, that are located at a material discharge end of said material feed backflow prevention device, and that are capable of receiving a flowable raw material extruded from said material discharge end, said pair of molds being configured to be clamped and locked by the mold blocks when the mold blocks are driven by said multi-mold block drive device to move toward each other.