A monitoring system (100) monitors displacement of a wind turbine tower and includes at least one plumb bob with an upper part and a lower part, each plumb bob being configured to be pivotally suspended at its upper part, via a suspension device, from a point above so as to attain a rest position in a rest situation, and each said plumb bob has one or more sensing surfaces (12, 12). One or more suspension devices means (10) suspend the at least one plumb bob. Two or more sensors (14, 14, 14), each being configured to sense, in a specific sensing direction (16, 16, 16), a distance to a plumb bob, provide displacement data. At least two of the two or more sensors (14, 14, 14) are arranged in a sensing vicinity of a plumb bob, with at least two of the specific sensing directions (16, 16, 16) not being parallel to each other. The monitoring system includes a control unit (18) configured to receive the displacement data from two or more of the sensors, and a device for reporting, to an external unit (20), parameter(s) representing displacement of a wind turbine tower.

The present disclosure is to provide a detection device. The detection device is configured to measure the coaxiality of the three camshaft mounting holes of the valve chamber cover during usage; and meanwhile, the detection device has the characteristics of high measurement accuracy, simple structure, low production cost, and the like.

The present disclosure is to provide a detection device. The detection device is configured to measure the coaxiality of the three camshaft mounting holes of the valve chamber cover during usage; and meanwhile, the detection device has the characteristics of high measurement accuracy, simple structure, low production cost, and the like.

A concentricity detection system is adapted to detect a concentricity of an annular component. The concentricity detection system includes a support base having a recess on a top surface, a transparent plate received and positioned in the recess, a vision detection device located above the support base and facing the transparent plate, and a backlight source located below the support base and facing the transparent plate. The annular component is disposed in the recess of the support base and supported on a top surface of the transparent plate. The vision detection device is configured to detect the concentricity of the annular component supported on the transparent plate. A through hole is formed in a bottom portion of the recess and a light from the backlight source passes through the support base via the through hole and the transparent plate to provide backlighting for the annular component.

A method and apparatus for aligning a crosshead of a mud pump with the fluid end of the mud pump without having to remove the rod system (piston rod, extension rod) of the pump. The apparatus comprises a dial indicator which measures differential distance and a connection component for connecting the apparatus directly or indirectly to the crosshead. The method and apparatus allow the establishment of perpendicularity and concentricity of the crosshead with respect to the bore in the fluid end of the pump.

A method and apparatus for aligning a crosshead of a mud pump with the fluid end of the mud pump without having to remove the rod system (piston rod, extension rod) of the pump. The apparatus comprises a dial indicator which measures differential distance and a connection component for connecting the apparatus directly or indirectly to the crosshead. The method and apparatus allow the establishment of perpendicularity and concentricity of the crosshead with respect to the bore in the fluid end of the pump.

A surface pressure measuring device includes an abutting plate, a lift, a probe, a piezo actuator and a controller. A pinhole is formed in the abutting plate at an abutting surface that abuts a target. The lift causes the target to abut the abutting surface such that the target is compressed to a predetermined thickness. The probe is inserted through the pinhole to be movable in an axial direction of the pinhole. The piezo actuator holds a state in which a tip surface is flush with the abutting surface as the probe resists a repulsive force received from the target while the lift causes the target to abut the abutting surface. The controller calculates a local surface pressure of the target from a load applied to the probe and an area of the tip surface of the probe.

The flange checking device is an instrument that is configured for use in measuring the runout of a flange. The flange checking device measures lateral irregularities in the face of the flange that can cause failures in seals the flange may form. The flange checking device comprises a center shaft, a mounting structure, a measuring structure, and a measuring instrument. The mounting structure is a first adjustable structure that physically attaches the flange checking device to the flange that is to be inspected. The measuring structure is a second adjustable structure that applies the measuring instrument to the flange face. The measuring instrument measures irregularities within the flange face.

A rotor component for a rotor assembly of a fluid energy machine, particularly of a gas turbine, a steam turbine, a compressor or the like, wherein the rotor component is at least partly made of a material susceptible to corrosion and/or oxidation and can be arranged concentrically to a rotation axis of the rotor assembly. The rotor component includes a circular surface for checking concentricity of the rotor component with respect to the rotation axis. The rotor component includes at least one additional circular surface for checking concentricity of the rotor component with respect to the rotation axis, wherein the additional circular surface is coated with a corrosion and/or oxidation protection coating.

In order to improve a method for positioning a centre point of a second machine tool unit of a machine tool on a geometric axis of a first machine tool unit of the machine tool, wherein the second machine tool unit has a circular path concentric with the centre point, and wherein the first machine tool unit has a component that is rotatable about the geometric axis, in such a way that said method can be performed by an operator easily, reliably and within a short timeframe, it is proposed that a measuring unit is arranged in a defined manner relative to the geometric axis and the position of the circular path relative to the geometric axis is established using the measuring unit, that the position of the centre point of the circular path in the geometric plane relative to the geometric axis is calculated, and that adjustment paths in the geometric plane, which are associated with the adjustment directions, for positioning the centre point on the geometric axis are calculated, and that the machine tool units are moved relative to one another in accordance with these adjustment paths.