Embodiments of the present disclosure provides an anti-loosening device and a plunger pump. The anti-loosening device includes a first bracket, a second bracket and an elastic member. The first bracket includes a first clamping part defining a first accommodating space; a first connecting part extending in a first direction and fixedly connected to the first clamping part; and a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction. The second bracket includes a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction; and a second connecting part extending in the first direction and fixedly connected to the second clamping part.

Embodiments of the present disclosure provides an anti-loosening device and a plunger pump. The anti-loosening device includes a first bracket, a second bracket and an elastic member. The first bracket includes a first clamping part defining a first accommodating space; a first connecting part extending in a first direction and fixedly connected to the first clamping part; and a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction. The second bracket includes a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction; and a second connecting part extending in the first direction and fixedly connected to the second clamping part.

A mounting device connects a rotary shaft to a rotatable machine element. The mounting device includes an inner sleeve for clamping onto the shaft and an outer sleeve for clamping onto the machine element. The inner and outer sleeves have cooperating tapered surfaces for tightening the mounting device. The cooperating tapered surfaces include striations. A nut connected with the inner and outer sleeves is rotatable to drive the inner sleeve relative to the outer sleeve in a first direction to tighten the inner sleeve onto the shaft and the outer sleeve onto the machine element.

A mounting device connects a rotary shaft to a rotatable machine element. The mounting device includes an inner sleeve for clamping onto the shaft and an outer sleeve for clamping onto the machine element. The inner and outer sleeves have cooperating tapered surfaces for tightening the mounting device. The cooperating tapered surfaces include striations. A nut connected with the inner and outer sleeves is rotatable to drive the inner sleeve relative to the outer sleeve in a first direction to tighten the inner sleeve onto the shaft and the outer sleeve onto the machine element.

Embodiments of the present disclosure provides an anti-loosening device and a plunger pump. The anti-loosening device includes a first bracket, a second bracket and an elastic member. The first bracket includes a first clamping part defining a first accommodating space; a first connecting part extending in a first direction and fixedly connected to the first clamping part; and a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction. The second bracket includes a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction; and a second connecting part extending in the first direction and fixedly connected to the second clamping part.

A pipe machining apparatus includes a frame, a tool support mounted on a tool carrier which is mounted on the frame, and a gearing arrangement for rotating the frame, and a motor for rotating the gearing arrangement. The gearing arrangement includes a toothed pinion gear, a toothed backlash adjustment gear which is moveable relative to the pinion gear and being capable of being fixed in position relative to the pinion gear by a locking assembly, and a toothed bull gear affixed to the tool carrier. The teeth of the bull gear are capable of being engaged with the teeth of the pinion gear and with the teeth of the backlash adjustment gear, the bull gear to minimize backlash.

A pipe machining apparatus includes a frame, a tool support mounted on a tool carrier which is mounted on the frame, and a gearing arrangement for rotating the frame, and a motor for rotating the gearing arrangement. The gearing arrangement includes a toothed pinion gear, a toothed backlash adjustment gear which is moveable relative to the pinion gear and being capable of being fixed in position relative to the pinion gear by a locking assembly, and a toothed bull gear affixed to the tool carrier. The teeth of the bull gear are capable of being engaged with the teeth of the pinion gear and with the teeth of the backlash adjustment gear, the bull gear to minimize backlash.

An apparatus is provided for connecting a rotary shaft to a rotatable machine element. The apparatus includes and inner sleeve for clamping onto the shaft and an outer sleeve for clamping onto the machine element. The inner and outer sleeves have cooperating tapered surfaces for tightening the apparatus. The cooperating tapered surfaces include striations. A nut connected with the inner and outer sleeves is rotatable to drive the inner sleeve relative to the outer sleeve in a first direction to tighten the inner sleeve onto the shaft and the outer sleeve onto the machine element. A method is also provided for forming a mounting device for connecting a machine element with a rotary shaft.

A braking and/or clamping device includes an annular housing which has a pneumatic or hydraulic connection and surrounds an axially oriented rod receptacle. The housing has a base part and a cover part. An annular pressure chamber is disposed within the housing. The pressure chamber is axially delimited by a piston which is movable in the axial direction. The pressure chamber is radially delimited by the outer walls of the housing and by an inner ring which surrounds an inner wall of the housing. The inner wall has an inner wall portion. In the housing, a disc element is disposed on the piston top face, which faces away from the pressure chamber and is axially oriented. The piston top face is seated against or fastened to the disc element. The inner wall portion is protrudingly located in a cover part or in a base part of the housing.

A braking and/or clamping device includes an annular housing which has a pneumatic or hydraulic connection and surrounds an axially oriented rod receptacle. The housing has a base part and a cover part. An annular pressure chamber is disposed within the housing. The pressure chamber is axially delimited by a piston which is movable in the axial direction. The pressure chamber is radially delimited by the outer walls of the housing and by an inner ring which surrounds an inner wall of the housing. The inner wall has an inner wall portion. In the housing, a disc element is disposed on the piston top face, which faces away from the pressure chamber and is axially oriented. The piston top face is seated against or fastened to the disc element. The inner wall portion is protrudingly located in a cover part or in a base part of the housing.