| 摘要 |
A slide valve (101) for a powdered material or a material with a small grain size. The valve (100) comprises a stiff frame (10), which defines a discharge mouth (OP) to discharge the material, and a shutter (40) of the discharge mouth (OP), which is activated by respective moving organs (50). The valve (100) is characterised in that it comprises a height adjusting device (20) for a sealing element (30). The height adjusting device (20) is suited to compensate the loss of sealing effect between the lower face (80) of the sealing element (30) and an upper surface (40A) of the shutter (40). The loss of sealing power is due to the wear generated by the relative friction between the lower face (80) and the surface (40A). A circular knitting machine (1 ) for knitwear or hosiery, comprising a bearing structure (2), a needle cylinder (C ), a plurality of needles and a plurality of thread feeding points, or feeders (3), positioned circumferentially about the needle cylinder, in which the thread is supplied to the needles. Each feeder is provided with at least a thread guide group (4), comprising a body (5), a pneumatic supply inlet (6), a plurality of feeders, a plurality of pneumatic actuators able to move the feeders, and a plurality of solenoid valves (8) mounted and connected directly to the body (5), wherein each solenoid valve activate or deactivates the pneumatic supply to a respective pneumatic actuator of the thread guide group. Each feeder further comprises a mobile cam device (10) for command of the needles, comprising a body (11), a pneumatic supply inlet (12), one or more mobile command cams (13) able to interact with the needles, a plurality of pneumatic actuators which move the command cams, and a plurality of solenoid valves (14) mounted and connected directly to the body (11), wherein each solenoid valve activates or deactivates the pneumatic supply to a respective pneumatic actuator of the device (10). Each feeder comprises an electronic feeder command board (20), able to command at least the solenoid valves (8) of the thread guide group (4) and the solenoid valves (14) of the mobile cam device (10), with the aim of selectively activating the pneumatic actuators of the thread guide group and the mobile cam device (10). The knitting machine (1) comprises at least a pneumatic supply pathway able to supply the pneumatic actuators of the plurality of feeders (3) of the machine. A slide valve (101) for a powdered material or a material with a small grain size. The valve (100) comprises a stiff frame (10), which defines a discharge mouth (OP) to discharge the material, and a shutter (40) of the discharge mouth (OP), which is activated by respective moving organs (50). The valve (100) is characterised in that it comprises a height adjusting device (20) for a sealing element (30). The height adjusting device (20) is suited to compensate the loss of sealing effect between the lower face (80) of the sealing element (30) and an upper surface (40A) of the shutter (40). The loss of sealing power is due to the wear generated by the relative friction between the lower face (80) and the surface (40A). |
