A conveying device for conveying a viscous material from a container includes a follower plate that can be inserted into the container, and a pump by means of which the viscous material can be conveyed through the follower plate. Moreover, a measuring chamber for accommodation of a measuring sample of the viscous material is provided. The measuring chamber includes a closable material inlet opening for this purpose. A closable disposal line leads away from the measuring chamber. Moreover, a closable material return line extends from the measuring chamber via the follower plate into the container. The conveying device also includes a controller that is designed and can be operated appropriately such that it determines the compressibility of each of multiple measuring samples. The controller opens the disposal line or the material return line to the measuring sample present in the measuring chamber as a function of the compressibility thus determined.

A charging system for feeding processing material to at least one extruder screw including a hopper configured to conduct the processing material along a feed direction to the extruder screw, and a material reservoir for the gravity-driven feeding of the processing material to the hopper. The charging system also includes a feeding device via which processing material recirculated at the hopper against the feed direction by action of the extruder screw can again be conveyed in the direction of the extruder screw together with processing material fed from the material reservoir.

An injection molding apparatus has a mold tool that is positioned around a field joint of a pipeline to define a mold cavity. Two or more pumping chambers communicate with the mold tool. Each chamber is expansible to draw in molten polymer and contractible to drive the polymer into the mold cavity. Expansion of one chamber is synchronized with contraction of another chamber. The operation of supply and injection valves associated with the chambers is also synchronized, both with each other and with expansion and contraction of the chambers. In the embodiment described, two pumping chambers are defined within a common pressurizing cylinder, in which the chambers are separated by a piston. The piston is movable within the cylinder to determine and to synchronize expansion and contraction of the chambers.

A conveying device for conveying a viscous material from a container includes a follower plate that can be inserted into the container, and a pump by means of which the viscous material can be conveyed through the follower plate. Moreover, a measuring chamber for accommodation of a measuring sample of the viscous material is provided. The measuring chamber includes a closable material inlet opening for this purpose. A closable disposal line leads away from the measuring chamber. Moreover, a closable material return line extends from the measuring chamber via the follower plate into the container. The conveying device also includes a controller that is designed and can be operated appropriately such that it determines the compressibility of each of multiple measuring samples. The controller opens the disposal line or the material return line to the measuring sample present in the measuring chamber as a function of the compressibility thus determined.

The present invention relates to a system (100) for manufacturing a Field Joint Coating (11), the system comprising: a heating device (102) for heating a quantity of a polymer, an upstream pump (104) for pumping the quantity of heated polymer into a storage compartment (106) of an ejection device (108), the ejection device (108) which is constructed for each time ejecting the heated polymer from its storage compartment, the ejection device comprising: o a barrel (1 10) which defines the storage compartment, the barrel being reinforced and configured for repeated use, o a plunger (1 1), o an actuator (1 14) for driving the plunger through the barrel for emptying the storage compartment, a downstream pump, the downstream pump being constructed for increasing the operating pressure of the ejected polymer, a mould (200) configured to be positioned at a field joint (13) around a pipeline.

A material filling apparatus for 3D printing fills materials into a material tank by a feeding part and includes a fixed sleeve with a first open end and a fixed end connected to the feeding part, a moving sleeve movably inserted and tightly fitted and interfered with the fixed sleeve, and a material output pipe inserted into the moving sleeve. The material tank is movably sheathed on the material output pipe. The moving sleeve has a second open end and a blocking end. The material output pipe has a connecting end and a material output end. The blocking end blocks the rear end of the material tank. The material tank squeezed by the filled material moves the connecting end towards the material output end and the rear end away from the material output end to push the blocking end and move the moving sleeve together with the material tank.

A material filling apparatus for 3D printing fills materials into a material tank by a feeding part and includes a fixed sleeve with a first open end and a fixed end connected to the feeding part, a moving sleeve movably inserted and tightly fitted and interfered with the fixed sleeve, and a material output pipe inserted into the moving sleeve. The material tank is movably sheathed on the material output pipe. The moving sleeve has a second open end and a blocking end. The material output pipe has a connecting end and a material output end. The blocking end blocks the rear end of the material tank. The material tank squeezed by the filled material moves the connecting end towards the material output end and the rear end away from the material output end to push the blocking end and move the moving sleeve together with the material tank.