Injection device provided with flow path switching block

An injection apparatus including a flow path switching block, the injection apparatus comprising:

• a plasticization device configured to melt resin;
• at least one plunger injection device configured to measure an amount of resin melted in the plasticization device and to inject the melted resin;
• an injecting portion configured to inject the resin;
• and
• the flow path switching block connecting the plasticization device, the at least one plunger injection device and the injecting portion,
• wherein the flow path switching block comprises a first connecting flow path, a second connecting flow path, a third connecting flow path, a fourth connecting flow path and one flow path switching valve,
• wherein the plasticization device is connected to the first connecting flow path, the at least one plunger injection device is connected to the second connecting flow path, and the injecting portion is connected to the third connecting flow path,
• wherein when the flow path switching valve is switched to a first position, the first connecting flow path and the second connecting flow path communicate with each other, and the third connecting flow path and the fourth connecting flow path communicate with each other,
• wherein when the flow path switching valve is switched to a second position, the first connecting flow path and the fourth connecting flow path communicate with each other, and the second connecting flow path and the third connecting flow path communicate with each other, and
• wherein the first in-valve flow path has a greater bore diameter than a bore diameter of the second in-valve flow path.

An injection apparatus including a flow path switching block, the injection apparatus comprising:

• a plasticization device configured to melt resin;
• at least one plunger injection device configured to measure an amount of resin melted in the plasticization device and to inject the melted resin;
• an injecting portion configured to inject the resin;
• and
• the flow path switching block connecting the plasticization device, the at least one plunger injection device and the injecting portion,
• wherein the flow path switching block comprises a first connecting flow path, a second connecting flow path, a third connecting flow path, a fourth connecting flow path and one flow path switching valve, the flow path switching valve comprising:
• a bore, the first connecting flow path, the second connecting flow path, the third connecting flow path, and the fourth connecting flow path being communicated with the bore,
• a valve body rotatable within the bore and having two grooves extending in a circumferential direction on an outer circumferential surface thereof;
• and
• a first in-valve flow path and a second in-valve flow path that are two independent flow paths, the first in-valve flow path being made up of one of the two grooves and the bore, the second in-valve flow path being made up of the other of the two grooves and the bore,
• wherein the plasticization device is connected to the first connecting flow path, the at least one plunger injection device is connected to the second connecting flow path, and the injecting portion is connected to the third connecting flow path,
• wherein when the flow path switching valve is switched to a first position, the first connecting flow path and the second connecting flow path communicate with each other via the first in-valve flow path, and the third connecting flow path and the fourth connecting flow path communicate with each other via the second in-valve flow path, and
• wherein when the flow path switching valve is switched to a second position, the first connecting flow path and the fourth connecting flow path communicate with each other via the first in-valve flow path, and the second connecting flow path and the third connecting flow path communicate with each other via the second in-valve flow path.