Patent ID: 8651840
Filing Date: 2014-02-18
Classification: F04B

Abstract:
1. A plunger pump for fabricating soft capsules, comprising: a switch body and a plunger body interconnected to each other; a rotary switch associated with the switch body; and a plunger rod associated with the plunger body, the switch body and the plunger body define an accommodation space, the switch body has a liquid suction hole and a liquid injection hole, both the liquid suction hole and the liquid injection hole are in communication with the accommodation space, the plunger body has a channel to accommodate the plunger rod, and the rotary switch is attached to the switch body to form a hermetic surface; the rotary switch has a notch thereon, by rotation of the rotary switch, the rotary switch closes the liquid injection hole when the notch opens the liquid suction hole, or the rotary switch closes the liquid suction hole when the notch opens the liquid injection hole; the plunger rod to perform a linearly reciprocating movement in the channel of the plunger body so that the accommodation space periodically reaches a maximum value of capacity and a minimum value of capacity, wherein the rotary switch is connected with a rotary shaft, the switch body has a channel thereon to accommodate the rotary shaft, and the rotary shaft is positioned to rotate in the channel of the switch body to simultaneously bring the rotary switch into rotation; the rotary shaft and the switch body are provided therebetween with a seal ring and a bearing that supports the rotary shaft; the rotary shaft is connected at an end thereof with a spring, a thrust bearing, an adjusting nut, and a shifting fork, which are arranged at a side of the switch body opposite the rotary switch and mounted coaxial with the rotary shaft; the adjusting nut is positioned to press, via the thrust bearing, the spring onto the switch body.