Choosing the right material metering and dispensing pump for specific application is critical as pump is known as the heart of every dispensing system. Pump distributes precise volumes of material within a specific time interval. Whether it’s accuracy and precision or the need to perform for millions of cycles, understanding the most suitable types of pumps available is the first step.
Pump technology, together with the development of dispensing system, is currently improved in both variety and quality. The main pump bodies are as follow:
Gear Pump
Applied to glue without filler, corrosive, and viscosity less than 20000 cps
Construction: Two gears of the same size mesh and rotate with each other in a tightly fitted housing. The inside of the housing is similar to an “8” shape. Two gears are installed inside. The outer diameter and both sides of the gears are closely matched with the housing.
Operation: The material from the storage barrel enters the middle of the two gears at the suction port, and fills the space, moves along the shell with the rotation of the teeth, and is finally discharged when the two teeth mesh.
Screw Pump
Applied to glue with precipitation (including some fillers),
low corrosiveness, and viscosity less than 30,000 CPS
Construction: The screw pump works according to the principle of revolving meshing volume type. The main working parts of the screw pump are the eccentric screw (rotor) and the fixed bushing (stator). Due to the special geometry of the two parts, separate sealed cavities are formed respectively.
Operation: The medium promotes the flow evenly from the axial direction. The internal flow rate is low and the volume remains unchanged. The pressure of the screw pump is stable, so there is no turbulence and agitation. Its biggest feature is its strong adaptability to the medium, stable flow, low pressure pulsation, and high self-priming capacity. This cannot be replaced by any other pump type.
Plunger Pump
Applied to glue with precipitation (including some fillers),
low corrosiveness, and viscosity less than 30,000 CPS
Construction: The device includes a motor, a pump head, a ball screw, a transmission gear, an induction switch, and a bottom plate. The motor is connected with the transmission gear, and one side of the two ball screws is fixed on the bottom plate. The other side of the pump head fixing plate is connected with the transmission gear. Each ball screw is provided with a plunger rod. A support rod is arranged between the front fixing plate of the ball screw and the pump head fixing plate. Two ends of one of the support rods are respectively provided with an induction switch; the pump head is provided with four glue inlet and outlet through holes, one end of the through hole is connected with the outside, and the other end is sealed with the plunger rod.
Operation: The method is to change the direction of glue in and out by changing the rotation direction of the motor and the direction of the reversing valve on the pump head after the signal is sensed by the inductive switch, keeping the two glue in and out ports always in a state of one glue in and one glue out. The invention has high control precision, stable glue in and out, and continuous glue out.