A hydraulic fluid cylinder is equipped with a cylinder tube, a piston unit, and a piston rod. The piston unit has a piston body provided with a gasket-mounting groove. A gasket member is mounted in the gasket mounting groove. The gasket member has a gasket body provided with a magnet-mounting groove exhibiting groove depth in the axial direction of the piston unit, and also has a magnet mounted in the magnet-mounting groove.

A system and method for identifying wear of a mechanical actuator configured to move an implement operatively connected to a work machine. The mechanical sensor includes a sensor, a cylinder, and a rod configured to extend and retract from the cylinder, wherein the mechanical actuator is operatively connected to the implement and to the work machine to move the implement with respect to the work machine in response to a machine command transmitted by an electronic control module. A retracted reference location of the rod is determined based on a minimum distance between the implement and the work machine. An extended reference location of the rod is identified based on a maximum distance between the implement and the work machine. The retracted reference location or the extended reference location is compared to one or more threshold values to generate a comparison value. Mechanical wear is determined based on the comparison value.

A clamping device with a housing, with a piston with piston rod running in the housing, and with a monitoring unit arranged at least partially in the housing, wherein the monitoring unit includes at least two sensor units. The sensor units are spaced apart from one another along a longitudinal axis of the piston rod, and are arranged at a distance from the piston rod. The piston and the piston rod, and a metallic signal transmitter arranged on the piston or on the piston rod, are movable in a positively driven manner between a first end position and a second end position. The first sensor unit is arranged at the first end position of the signal transmitter, and the second sensor unit is arranged at the second end position of the signal transmitter. Each sensor unit has a first and second sensor and includes an induction coil and an oscillator.

In a piston unit of a fluid pressure cylinder a plurality of magnets are disposed through holes provided in a ring body. The magnets are disposed in facing relation to detection sensors that are mounted on connecting rods, and are provided in the same quantity as the connecting rods. Further, a guide rod extending from a head cover to a rod cover is inserted through the interior of the ring body. When the piston unit is displaced along the cylinder tube, rotational displacement is restricted by the piston unit being displaced along the guide rod, whereby the magnets are retained to face toward the connecting rods at all times. Therefore, the position of the piston unit is detected by the detection sensors through the magnets.

A fluid-actuated rotary actuator includes a housing having a tubular body extending in an axial direction, in which is provided a drive piston assembly for driving a rotatably mounted output shaft, which extends perpendicular to the axial direction through the tubular body and the axial end of which is routed out of the tubular body at an upper wall section of the tubular body, further including a magnet assembly associated with the axial end of the output shaft and receiving a rotary movement of the output shaft, and further including a position feedback device configured to detect the magnetic field generated by the magnet assembly and to provide, in accordance with the detected magnetic field, a position signal corresponding to a position of the output shaft, wherein the position feedback device is located in a receptacle chamber formed in the upper wall section of the tubular body.

An energy-saving pneumatic barrier gate device comprises a machine, having an actuating portion, an electronic control portion, and a gas supply portion connected to an air compressor; a shaft assembly and two switch components, installed on the actuating portion; a barrier component, installed on one end of the shaft assembly; and a driving assembly, installed on the other end of the shaft assembly. The shaft assembly controls execution of swinging of the barrier component. The two switch components control cessation of swinging of the barrier component. The driving assembly controls the movement of the shaft assembly and barrier component, and includes a linkage rod pivoted to the shaft assembly and two bellow pumps each having one end pivoted to a respective one of two ends of the linkage rod and the other end installed on a respective one of supports on an outer surface of the gas supply portion.

A monitoring device for determining a position of a displacement piston (1) guided longitudinally movably in a housing (7) and, in the housing (7) and delimits a fluid chamber (3, 5) with a variable volume and connected via a pressure supply connector (9, 11) to a pressure fluid control device (13). A volumetric flow regulating device (45) and a pressure determining device (47) are connected between the pressure fluid control device (13) and the measuring connector (15, 17) of the fluid chamber (5, 3). The pressure determining device (47) outputs a measuring signal when the displacement piston (1) reaches an end position.

An actuator having sufficiently high detection accuracy while having a simple configuration is provided. An actuator includes a cylinder (51), a piston (52) that moves inside the cylinder (51), a stroke sensor (53) that detects a position of the piston (52), an edge portion (51a1) that restricts rotation to one side, and a restriction protrusion (51b) that restricts rotation to the other side. The amount of rotation allowed by the edge portion (51a1) is larger than the amount of rotation allowed by the restriction protrusion (51b). A center of a sensor (53c) of the stroke sensor (53) is shifted to one side from a center of a member to be detected (53b) fixed to the piston (52).

An automatically controlled hydraulic fracturing pump system includes a hydraulic cylinder controlled via a hydraulic circuit; a sensor in communication with the hydraulic circuit; and a control module in data communication with the sensor. The control module has a memory storing computer-readable instructions; and a processor configured to execute said instructions to: (1) determine, via the sensor, an attribute about the hydraulic cylinder; (2) determine an attribute about the hydraulic fracturing pump system; (3) determine a value for correcting movement of the hydraulic cylinder; and (4) send a signal to the hydraulic circuit to adjust movement of the hydraulic cylinder.

A rotary actuator (10) is provided with a linear activation mechanism (40a) that causes a pinion (80) to rotate, and a cylinder body (12) in which a cylinder hole (28a) is formed. The linear activation mechanism (40a) comprises a rack (42) on which a plurality of teeth (44) that mesh with the pinion (80) are provided, and pistons (48a, 48b). The pistons (48a, 48b) are each provided with a piston main body (50a, 50b) that has a shape corresponding to that of the cylinder hole (28a). Each of the piston main bodies (50a, 50b) comprises a body (52a, 52b) and an extension section (54a, 54b). The ends of the rack (42) are connected to the extension sections (54a, 54b) of the set of pistons (48a, 48b), and a space (73a) shielded from the cylinder hole (28a) is formed between the bodies (52a, 52b) of the set of pistons (48a, 48b). The linear activation mechanism (40b) is also configured similarly.