34results about How to "Reduce uneven wear" patented technology

A crushing chamber is formed between a concave liner and a mantle liner. The concave liner has a first area surface having a length of T to √2T; a second and a third area surface; which surfaces are gradually inclined from the side of the inlet for the crushing chamber. The mantle liner has a first tapered surface having a length of greater than T, a cross angle of less than 20° and an inclination angle of greater than 60°; a second tapered surface having a length of greater than 0.5T and a cross angle of 5° to 10°; and a third tapered surface having an inclination angle of 45° to 50°. The area surfaces as well as the tapered surfaces are continuously arranged in a curvilinear manner. The shapes enhance the throughput of goods in a good fine-crushing performance, reducing the uneven abrasion due to the action.

The invention discloses a method for detecting the abrasion difference of cutter teeth of high-speed milling cutters under the action of vibration. The method is technically characterized by comprising the steps that firstly, the cutter tooth cutting motion speed and cutter skill contact relation under the action of vibration is built; secondly, a rear angle calculating equation under the action of vibration is calculated; thirdly, a cutter tooth friction contact point position calculating model and a cutter tooth friction contact point friction speed calculating model are constructed; fourthly, cutter tooth friction contact point positions and the cutter tooth friction contact point friction speed are analyzed, and the change rules of the cutter tooth friction contact point positions and the cutter tooth friction contact point friction speed are obtained; fifthly, an abrasion cutting test of the high-speed milling cutters is carried out; sixthly, cutting vibration signals are extracted and processed; seventhly, milling cutter abrasion cutting test data obtained in the fifth step is extracted; eighthly, the test results of the cutter tooth rear cutter face friction contact point positions and the friction contact point friction speed are obtained; and ninthly, a cutter tooth rear cutter face friction contact state model is verified. According to the method, bases are provided for relieving uneven abrasion and weakening fluctuating load excitation, and initial sample cutters are provided for efficient and high-precision cutting.

A treadmill and a control method for controlling the treadmill belt thereof are provided. The treadmill includes a treadmill belt, a first sensor, an image sensor and a controller. The first sensor retrieves a light pattern or the image sensor measures the characteristic properties of the image of the user so as to control the treadmill belt. The light pattern can be generated by a signal member, which can be disposed on a side or both sides of the treadmill belt.

The invention provides a method for optimizing a friction plate to reduce uneven wear. The method includes steps of building brake discs and friction plate models; carrying out grid division on the brake discs and the friction plate; carrying out thermo-mechanical coupling analysis by the aid of finite element software; acquiring stress values of discrete points of friction pairs according to temperature fields and contact pressure fields; determining maximum parameters of influence factors by the aid of PB (Plackett-Burman) experimental designs so as to obtain first-order fitting curves of the discrete points; acquiring the optimal solution by the aid of response surface design processes. The method has the advantages that influence of uneven contact pressures can be predicted, design variables can be changed, accordingly, the unevenness of wear can be compared, and the method is wide in application range and can be widely applied to designing different types of contact dry friction wear analysis.

The invention discloses a roll pass optimizing method capable prolonging shaped roll service life. The method is characterized by including the steps of firstly, building a mathematic model to calculate the rolling state of a rolled piece under a target rolling process; secondly, predicting roll abrasion condition under current production process conditions, evaluating roll abrasion state, and converting roll abrasion quantity into roll repairing quantity; thirdly, optimizing roll passes and the rolling process by evaluating roll cutting quantity. By the method, roll abrasion state is effectively changed during profile rolling, roll uneven abrasion is reduced, cutting nonuniformity during roll repairing is improved, turning quantity required by each roll pass recovery is reduced by 3-10mm, roll turning times are increased by 1-2, and the service life of shaped rolls is prolonged.

Disclosed is a door suspension apparatus that is capable of adjusting the position of a door in the open-close direction thereof without adjusting the positions of a latching part and a part being latched in a locking device. A drive connection unit (21) is provided with one from among the latching part (17) and the part being latched (18) in the locking device (13) that locks the door (11) to a structure in a fully-closed position through the latching of the latching part (17) and the part being latched (18), and is connected to an open-close drive mechanism (12). A door roller unit (22) is connected to the door (11) and provided with door rollers (36a, 36b, 36c) that run on a rail (19) fixed on the structure, and supports the door (11) in a suspended state freely sliding on the rail (19). A variable connection unit (23) connects the drive connection unit (21) and the door roller unit (22) in a manner enabling the alteration of the relative positions of the drive connection unit (21) and the door roller unit (22) in a direction along the lengthwise direction of the rail (19).

The invention relates to a tire for a two-wheeled motor vehicle, said tire comprising a tread, wherein the surface at least of the tread consists of a first polymer mixture extending over a portion at least of the central portion and at least a second polymer mixture having physical and chemical properties different from that of said first polymer mixture and covering a portion at least of the axially outer portions of the tread. At least the central portion of the tread comprises at least one sipe (5) in a circumferential plane, at least a portion (7) of a wall of said at least one sipe (5) being formed by at least two straight lines (370, 371) each defining an angle of between 5 and 65 DEG relative to the radial direction, and the direction of the straight lines together defining an angle of between 30 and 120 DEG .

According to the use method of the friction liner capable of detecting the tension of the steel wire rope and giving the alarm, friction liners are evenly distributed on a transverse shaft of a roller, the steel wire rope is wound in grooves of the friction liners, at least one sensor is arranged on the lower surfaces of the friction liners, a controller is arranged on one side of the roller, anda wire is arranged between the sensor and the controller; a wire is arranged between the controller and the alarm bell; according to the invention, the elevator can measure and report the current tension and the tension balance state of a plurality of steel wire ropes in real time in a static state and an operation state, can guide the tension adjustment time and numerical values needing to be adjusted, reduces the adjustment auxiliary time, improves the productivity and economic benefits, greatly reduces the unbalanced wear of friction liners, and improves the production efficiency. The maintenance frequency of the rope groove is reduced, the service life of the friction liner is prolonged, the service life of the steel wire rope is prolonged, the hoisting capacity and safety performanceof the hoister are improved, and major production safety accidents are reduced.

A wet friction disc includes a lubrication groove and a plurality of lands defined by the lubrication groove. The lubrication groove has a plurality of circumferential groove portions that extends in a circumferential direction and has a predetermined groove width in a radial direction, and a plurality of intersecting groove portions that extends in directions intersecting the circumferential direction. At least some of the circumferential groove portions have an arc shape such that an end in the circumferential direction is located adjacent to one of the lands in the circumferential direction and that the groove width is entirely contained within a range in the radial direction spanned by that land.

The invention relates to a method for levelling a checkered plate through a hot-rolling levelling unit, and belongs to the technical field of hot-rolling levelling units. According to the technical scheme of the method for levelling the checkered plate through the hot-rolling levelling unit, the mechanical aspect relates to model selection of a leveling machine HGC hydraulic cylinder and model selection of rolling line adjusting device; the electrical aspect comprises optimization of transmission control system speed slope parameters, optimization of a HGC screwdown control system PI adjuster and a proportionality coefficient and filtering treatment in pressure sensor feedback value; and an original single sine negative convexity or multi-power negative convexity roll shape of a working roll is changed, and an experience curve is used. The method for levelling the checkered plate through the hot-rolling levelling unit has the beneficial effects that the problem of levelling the checkered plate through the hot-rolling levelling unit is solved, meanwhile, the production efficiency is also improved obviously, the levelled checkered plate product quality accords with a technical index requirement, and good economic benefits are created for an enterprise.

A tire 22 includes a plurality of ribs 68 aligned in an axial direction. A rib 68s, among the plurality of ribs 68, disposed on an outer side in the axial direction is sectioned into a body portion 74 and a side portion 76 by a groove 72 that extends in a circumferential direction. The tire 22 includes a tread 26 and a pair of sidewalls 28. The sidewalls 28 extend almost inward from ends, respectively, of the tread 26 in a radial direction. The tread 26 includes a base layer 52, and a cap layer 54 disposed outward of the base layer 52 in the radial direction. The side portion 76 is formed by the cap layer 54 and a corresponding one of the sidewalls 28. The sidewall 28 is stacked on the cap layer 54 in the side portion 76.