527 results about "Mechanical engineering technology" patented technology

The invention relates to a forging manipulator lifting mechanism with inclined rear suspension rods in the technical field of the mechanical engineering, which is characterized in that the upper ends of two front suspension rods (12) are respectively connected at the lower ends of two front connecting pieces (9) by rotating hinges; the upper ends of the two front connecting pieces (9) are respectively connected on both sides of a movable frame (10) by rotating hinges; the movable frame (10) can move left and right on a front sliding rod (7); two rear suspension rods (16) are arranged symmetrically right and left in an inclined mode; the upper ends of the two rear suspension rods (16) are respectively connected at the lower ends of two rear connecting pieces (17) by rotating hinges; the upper ends of the two rear connecting pieces (17) are respectively connected on both sides of a rear sliding rod (2) by rotating hinges; two pitching linear drivers (4) are horizontally arranged on the top of a lifting arm front and back; and the front ends of the two pitching linear drivers (4) are respectively connected on both sides of a front lifting arm (6) by spherical hinges, while the rear ends thereof are respectively connected on both sides of a rear lifting arm (1) by spherical hinges. The forging manipulator lifting mechanism with the inclined rear suspension rods has the characteristics of high bearing capability, easy installation, long service life and the like and is suitable for forging operation of large-scale / ultra large forgings.

The invention relates to a walking-aid robot with a seat, belonging to the technical field of mechanical engineering. The walking-aid robot with the seat comprises a walking-aid stand, an elevating mechanism, a transmission mechanism and a walking drive mechanism, wherein the elevating mechanism and the transmission mechanism are respectively fixed on the stand; and the walking drive mechanism isfixed at the lower end of the walking-aid stand. The walking drive mechanism comprises back supporting legs, a walking drive motor, a first bevel gear, a second bevel gear, a first synchronous pulley,synchronous belts, a second synchronous pulley, a bearing seat, a gear box, steering wheels and driving wheels. The invention has compact structure, high driving efficiency and convenient use.

The invention provides a calibration method of pose position-free constraint line laser monocular vision three-dimensional measurement sensor parameters and belongs to the technical fields of optical measurement and mechanical engineering technologies. After basic data are extracted, imaging points are sequenced according to the invariance of a vector quantity cross product direction set composed of the imaging points of target feature points in any shooting pose position, and corresponding relation between the target feature points and the imaging points is built. Light plane feature points are extracted through quadrilateral intersection composed of a light knife central point set fitting straight lines and the target feature points, and a three-dimensional coordinate is calculated according to an intersection invariance principle. Inner and outer diameters in a monocular vidicon and light plane diameters of a line laser projector are optically fitted and calculated, and accurate calibration of the line laser monocular vision three-dimensional measurement sensor parameters is achieved. In calibration, a target can freely move and rotate completely, pose position placing is free of restraint, the same group of calibration images is shared for calibration of two parts of diameters, the calibration accuracy of a three-dimensional measurement sensor is ensured, and simultaneously calibration steps are simplified.

Automatic-resetting super elasticity shape memory alloy damper is a damping control device used in the areas of civil construction and mechanical engineering technique .It is characteristiced by its framework that consisted of a working piston , a fixing piston , a cylinder ,a cover and a joint rod .The machine uses its alloy wire to restrict the left and right pistons to the partition-wall of the cylinderand the spacing nut. when the pull bar works, piston in one side works follow it ,the piston in the other side is resisted by the partition-wall of the cylinder and keep the resetting alloy wire on running and produce a great anamorphosis restoration ability.The pre-strain resetting super elasticity shape memory alloy wires are divided into tow groups, one of which is used to connect the right fixing piston to the left coverand, the other is used to bind the left fixing piston to the right cover.the two groups doing a interchange push and pull in the pull bars in order to create a bigger energy consumption. The invention simultaneously has the functions of good energy consumption and resetting.It can reduce the vibration of fabrics, components or the remained deformation and has simple structure.

A multi-dimensional hyperelastic shape memory alloy damper is a damping control device which is used in the technologies of civil construction and mechanical engineering. It is characterized in that: the damper is mainly composed of shape memory alloy thread, internal and external steel containers. The internal and external steel containers are coaxial and the shape memory alloy threads distribute level symmetry along the circle radial of the steel containers. The shape memory alloy threads penetrate into the external steel container and out of the internal steel container, and their ends are fixed on the internal and external steel containers separately. The threads are pulled to the midpoint of its hyperelastic platform by the prestrain of the adjustable screws and nuts. The plane motion of the internal steel container relative to the external steel container causes the elongation and shortening alternative change of the threads to provide stable damping force and large energy dissipation force. Its effects and advantages are: it has passive energy dissipation effect on any direction in the flat and functions of vibration damping and reduction on vertical and torsion direction. It can realize the multi-dimensional passive control of the structure.

The invention discloses an in-situ calibration method for structure parameters of a large-visual-field binocular stereo vision system by small two-dimensional targets, which belongs to the technical fields of optical measurement and mechanical engineering. The calibration method comprises the following steps of: acquiring images of the small two-dimensional calibration targets which are placed in different positions in a measurement scene; respectively computing external parameters, which correspond to the calibration targets placed in the different positions and are opposite to left and right cameras, according to internal parameters, which are calibrated in an off-line manner, of the left and right cameras, and further computing the structure parameters of the stereo vision system; and finally, establishing an objective function to perform nonlinear optimization on the structure parameters of the stereo vision system. The small two-dimensional calibration targets effectively solve the problems of high cost, difficulty in transportation and storage and inconvenience in application and maintenance of large high-precision calibration targets, and can be applicable to the in-situ calibration of the structure parameters of the stereo vision system in a complicated environment.

The invention relates to a rear-mounting type self-positioning fixing device for a hobbing cutter of a shield machine, which is applied to the field of mechanical engineering technology of the shield machine. The whole device consists of a bolt, a wedgy pressing block, a heteromorphic nut, a hobbing cutter shaft, a tool apron, the hobbing cutter and a O-shaped sealing ring; the heteromorphic nut is matched with the O-shaped sealing ring for use; the hobbing cutter shaft is manufactured into a shape matched with a hobbing cutter shaft fixing part of a lateral panel of the tool apron and is contacted with the lateral panel of the tool apron for positioning; the third plane of the end of the hobbing cutter shaft is contacted with the lateral face of the wedgy pressing block; the hobbing cutter is arranged on the hobbing cutter shaft, is pressed and is fixed on the lateral panel of the tool apron through the wedgy pressing block in the process of screwing the heteromorphic nut by the bolt; and in the process, the hobbing cutter realizes automatic and accurate positioning of mounting simultaneously, and two ends of the heteromorphic nut are provided with the O-shaped sealing ring respectively which prevents the bolt and the heteromorphic nut from rusting and is convenient to detach in maintenance, thereby avoiding penetration of slurry and the like into a screw thread part in the construction process of the shield machine. The rear-mounting type self-positioning fixing device has the advantages of simple structure, accurate positioning, reliable mounting, easy replacement as well as convenient and rapid replacement and maintenance operation on the hobbing cutter in the construction process of the shield machine.

The invention discloses a rope type self-reset shape memory alloy seismic isolation and seismic reduction support, and belongs to the technical fields of an architectural structure and mechanical engineering. A transverse anti-seismic cylinder tube (1), a transverse anti-seismic sliding passage (2), a connecting rod (3), a vertical anti-seismic cylinder tube (4), a vertical anti-seismic piston (5), a common biasing spring (6), a transverse anti-seismic alloy wire rope (7), a vertical anti-seismic alloy wire rope (9) and a fixing upright post (13) are added on the basis of an original structure. According to the rope type self-reset shape memory alloy seismic isolation and seismic reduction support disclosed by the invention, the self-reset capacity in the transverse direction is obtained while the self-reset capacity in the vertical direction is obtained, the self-reset capacity in the transverse direction and the self-reset capacity in the vertical direction are reasonably combined, and multidirectional seismic isolation and seismic reduction is obtained while the energy dissipation stability of multidirectional seismic isolation and seismic reduction of the rope type self-reset shape memory alloy seismic isolation and seismic reduction support is increased; meanwhile, the use is wide, the rope type self-reset shape memory alloy seismic isolation and seismic reduction support not only can be independently used as a tensile and compressive damper, but also can be independently used as a shear-resisting damper, and the rope type self-reset shape memory alloy seismic isolation and seismic reduction support has a wide market prospect.

The invention belongs to the technical field of mechanical engineering, and discloses a test system and a test method used for a servo hydraulic cylinder. In the invention, a hydraulic control device is respectively connected with the servo hydraulic cylinder to be tested, a pump source and an accumulator to build a complete hydraulic control loop; a closed-loop controller is respectively connected with the servo hydraulic cylinder to be tested, the hydraulic control device and a computer; and then the servo hydraulic cylinder to be tested is connected with a loading device to constitute a complete mechanical-hydraulic-electrical closed-loop control system used for the servo hydraulic cylinder testing. The invention has convenient operation and wide application range, and can comprehensively and systematically judge dynamic and static properties of the servo hydraulic cylinder to be tested by taking test indexes such as cleanliness, frictional characteristic, step response time, hysteresis loop, and the like aiming at different servo hydraulic cylinders in an equipment factory and engineering production field.

The invention relates to an automatic centrifugal casting machine with 12 work-stations in a technical field of mechanical engineering. The machine of the invention comprises: a second motor, a reducer and a divided mechanism input end of a cam roller gear are connected through a coupling. A big plate is arranged on a main shaft, the shaft direction of which is fixed by a first lock bolt; a damping mechanism is also arranged on the main shaft; the main shaft is arranged on a front bearing seat and a back bearing seat, and the circle of the big plate is 12-sided boundaries used for arranging 12 centrifugal casting machines. The first motor is arranged on an end of the big plate and a pulley is arranged on a shaft between the tail part of the centrifugal machine and the shaft of the first motor. The power of the first motor is transmitted to the centrifugal casting machine through 3 triangle belts, and the power supply wire of the first motor goes to a ring-slipping mechanism through the inner holes of the main shaft, and the front part of the centrifugal casting machine is provided with a cylinder die. The automatic centrifugal casting machine with 12 work station greatly changes the working environment of the casting workers, reduces the working intensity of the workers, improves the safety factor of the heat working workers and meanwhile reduces the load of the staff and improves the quality and output of the products.

The invention provides an eccentric distance radial adjustable inertia exciter and an application thereof, and belongs to the technical field of mechanical engineering. According to the eccentric distance radial adjustable inertia exciter and the application thereof, stepless continuous adjustment of the eccentric distance of a mass block in the radial direction is achieved, and then the magnitude of the excitation force is adjusted; and meanwhile, different excitation effects can be obtained through combination use of the exciters. The eccentric distance radial adjustable inertia exciter comprises a rotary power source, an exciter shell body and a rotary body. A power output shaft of the rotary power source is fixedly connected with a power input shaft of the rotary body. The exciter shell body is arranged on the outer side of the rotary body. The rotary body internally comprises a supporting plate, a stepping motor, a lead screw, a nut and the mass block. The stepping motor is fixed to the supporting plate. The supporting plate is installed on the inner wall of the rotary body. An output shaft of the stepping motor and one end of the lead screw are coaxially and fixedly connected. The other end of the lead screw is connected with the rotary body. After the lead screw and the nut are subjected to clearance elimination, a lead screw nut pair is formed. The mass block is fixedly connected with the nut. The center axis of the lead screw and the center line of a rotary shaft of the rotary body are orthogonal and arranged in the radial direction.

The invention belongs to the fields of mechanical engineering technology, self-repairing materials and lubricant preparation technology and relates to a lubricant additive of a self-repairing material which has a self-repairing function and is applied for repairing worn metal surfaces in situ during the friction wearing process of metals. The lubricant additive consists of serpentine, quartzite powder and a surface activator; the surface activator is 0.005 percent of the weight of the serpentine and quartzite powder; the powder is added into the lubricant for obtaining lubricant comprising a compound additive. The lubricant additive forms a self-repairing film layer on the worn metal surface for leading the surface of a metal friction pair to be ultra-hard and ultra-smooth with extremely small friction coefficients for playing the roles of wearing resistance and friction reduction, greatly improving the contact condition of the friction pair as well as improving the service life of a machine part. Moreover, the lubricant additive is nontoxic, belongs to an environmental friendly material, has a simple preparation technique and a conveniently operated surface decoration technique and is suitable for the industry production and application in large scale.

The invention belongs to the technical field of mechanical engineering, particularly relates to a mechanism capable of implementing six-degree-of-freedom adjustment of large workpieces, and aims to solve the problem of posture adjustment interference in an assembling process of large revolving parts. The mechanism comprises two single-bracket assemblies, wherein the two single-bracket assemblies are mounted side by side; an adjusted part (5) is mounted on the upper parts of the two single-bracket assemblies; the rear single-bracket assembly is a driving bracket; the front single-bracket assembly is a follow-up bracket; the two single-bracket assemblies are five-degree-of-freedom brackets; and five degrees of freedom comprise three translation degrees of freedom, a rotational degree of freedom and a follow-up rotational degree of freedom. The five-degree-of-freedom single-bracket assemblies are adopted, unlimited six-degree-of-freedom adjustment is realized, and the mechanism can implement six-degree-of-freedom unlimited adjustment on parts of which the diameters are 1.5 m, the lengths are 10 m and the weights are 2 t. An adjustment process is flexible, and clamping stagnation is avoided. Adjustment angle interference in a posture adjustment process of the parts is avoided effectively, and the parts are protected against being damaged.

The invention discloses a three-way vibration table, and belongs to the technical field of mechanical engineering. The three-way vibrating table is composed of a vibrating motor, an upper plate, a guide rail pair, a middle plate, a lower plate, a guide rail pair, a support, a bottom plate, a spring, a base, a sizing block, a linear bearing, a linear guide rail, an electrical cabinet and the like. According to the three-way vibrating table, the included angle of a fixed eccentric block and an adjustable eccentric block of an output shaft of the vibrating motor and the phase of adjustable eccentric blocks at two ends are adjusted, and so that the purposes of changing exciting force, vibrating strength and the degree of unbalance of vibration are achieved. In addition, the working frequency of the vibrating motor, frequency changing modes, the operating time of a certain frequency and the like are controlled by the electrical cabinet, and therefore the upper plate, the middle plate and the lower plate of the vibration table are enabled to generate various vibrations of different directions and different strengths.

The invention relates to a composite multi-frequency-band vibration isolation trench for a building, belonging to the technical fields of civil engineering and mechanical engineering. The composite multi-frequency-band vibration isolation trench comprises a perforated plate, an irregular plate, fillers, a hollow trench and a wave drag block, and is at least arranged under the earth surface on one side of the building, which faces a vibration source; the perforated plate, the irregular plate, the hollow trench and the wave drag block are sequentially connected with one another according to a direction from the vibration source to the building, and the heights and the widths of the perforated plate, the irregular plate, the hollow trench and the wave drag block are ensured to be consistent; one side of the irregular plate, which faces the vibration source, has a convex-concavo irregular structure, and the other side of the irregular plate is planar; and the fillers are filled in the irregular plate and the wave drag block.

The invention provides an electric vehicle variable speed drive hub, and belongs to the technical field of machine engineering. The electric vehicle variable speed drive hub solves the problem that an existing electric vehicle variable speed drive hub is poor in heat dissipation performance, loud in noise and low in output efficiency. The electric vehicle variable speed drive hub comprises a fixing shaft, a hub steel ring, a motor and a speed reducer, wherein the hub steel ring is positioned on the fixing shaft; the speed reducer is located in the hub steel ring, and the motor is located on one side of the speed reducer and located outside the hub steel ring; the motor is composed of a stator and a rotor, the stator is fixedly connected with the fixing shaft, and the rotor is positioned on the fixing shaft; the speed reducer comprises a box body, an input gear shaft, an output gear shaft and an overrun clutch, the box is fixedly connected with the fixing shaft, the input gear shaft is connected with the rotor, and the output gear shaft is fixedly connected with the hub steel ring; the rotor and the hub steel ring are connected through the overrun clutch. The electric vehicle variable speed drive hub has the advantages of being good in heat dissipation effect, high in universality and low in noise.

The invention belongs to the mechanical engineering technology field and relates to a detection device of a large-scale section-bar three-dimensional bending component and a detection method thereof. The device is formed by a detection work bench, at least one support, at least one detection sample plate and at least three positioning support sample plates. The support is fixed to the detection work bench. The detection sample plate and the positioning support sample plates are installed on the support respectively. In the invention, through measuring a gap value between a contour of the three-dimensional bending component located on the detection device and the detection sample plate on the detection device, a contour error value of a workpiece is determined, and a point coordinate value of a three-dimensional bending control curve of the workpiece at a detection sample plate cross section can be measured. The detection device constructs a positioning reference of the large-scale section-bar three-dimensional bending component and a cross section contour detection reference. Because the support can be arranged arbitrarily on the detection work bench, the device can adapt to detection and measurement of various kinds of section-bar bending components. The device belongs to a flexible detection device.

The invention relates to a large scale redundancy manipulator used for handling explosion and rescuing, pertaining to the technical field of mechanical engineering. In the invention, a lumbar mechanism, a large arm, a mid-arm, a small arm, a wrist mechanism and a paw are connected in series, thus obtaining a wingspan not more than 5 metres. The large arm realizes pitching movement relative to the lumbar mechanism under the action of a first push rod; the mid-arm realizes the pitching movement relative to the large arm under the action of a second push rod; the small arm realizes the pitching movement relative to the mid-arm under the action of a third push rod; the wrist mechanism realizes the pitching movement relative to the small arm under the action of a forth push rod; the paw which is driven by the wrist mechanism turns around relative to the wrist mechanism; 7 degrees of freedom are provided including the paw. The invention realizes the manipulator with high load, large wingspan, high redundancy and high precision, provides possibility for solving the problem of energy supply for long-term working and has high applicability in dangerous and complicated fields such as explosion disposal and rescuing.

The invention provides a dual-clutch automatic transmission of an automobile, belongs to the field of mechanical engineering, and solves the problems of a current transmission of complex structure and messy layout caused by the fact that the current transmission comprises a plurality of associated toothed wheels. The dual-clutch automatic transmission comprises seven forward gears and a reverse gear, as well as a clutch I, a clutch II, a solid input shaft, a hollow input shaft, a first forward shaft, a second forward shaft, a reverse shaft and a compensating gear with a main speed-down gear ring, wherein four forward gear toothed wheels are arranged on the second forward shaft in a positioning manner, and are meshed with four driving toothed wheels on the solid input shaft and the hollow input shaft in a one-to-one correspondence manner; and a reverse gear toothed wheel is arranged on the reverse gear in a positioning manner. The dual-clutch automatic transmission of the automobile only comprises five gear-driven assistant layers, and at least two gear-driven assistant layers are omitted, so that layout size in the axial direction of a gear-driven part is maximally shortened, and the loadable performance of the automatic transmission can be effectively ensured.

The invention relates to a positioning, clamping and detecting device used in the technical field of mechanical engineering, and particularly to a flexible positioning and detecting integrated detecting device for an automobile door. The flexible positioning and detecting integrated detecting device comprises a frame body, four vertical and flexible positioning and adsorbing mechanisms (A, B, C and D) adopting a same structure, two side (1) flexible positioning mechanisms (A and B) adopting a same structure, a side (2) flexible positioning mechanism and a laser probe head travelling mechanism which are mounted on the frame body and connected with a control system. The flexible positioning and detecting integrated detecting device for the automobile door has the benefits as follows: each positioning module has a three-degree-of-freedom automatic regulating function, thereby being suitable for positioning of various automobile doors, and the automobile doors can be clamped conveniently and quickly through vacuum adsorption; besides, the laser probe head can realize horizontal two-degree-of-freedom movement, the quick deviation detection of different parts of the automobile door is realized; and moreover, the positioning flexibility is high, the clamping is simple and reliable, the detection is automatic and quick, the production efficiency is high, and the cost is low.

The invention provides a high-pressure dynamic sealing testing device for a rubber ring, and belongs to the technical field of aerospace and mechanical engineering. The device comprises a reciprocating moving testing machine, a high pressure aerator, a gas flow meter and a test implementing body; the reciprocating moving testing machine moves by a reciprocating manner to enable the frictional movement between a sealing rubber ring on a connecting rod in the test implementing body and a replaceable lining testing material, and the reciprocating moving testing machine is able to synchronously measure the force and displacement; the gas leakage quantity can be synchronously measured through a designed pipeline system. The device has the effect and benefit that the high pressure dynamic sealing of the rubber ring can be tested under different design parameters; the device has the characteristics of being simple and convenient to assemble, flexible and easy to be used.

The invention provides a rubber ring high pressure dynamic sealing test device under extreme conditions, and belongs to the technical field of aerospace and mechanical engineering. The rubber ring high pressure dynamic sealing test device under the extreme conditions comprises a reciprocating movement test machine, a high pressure inflator, a gas flowmeter, a heating device, a refrigeration device and a test implementation body. Frictional force, displacement, temperature and gas leakage can be synchronously measured under sealed high pressure dynamic reciprocating movement of a rubber ring in the extreme conditions. The effects and the benefits of the rubber ring high pressure dynamic sealing test device under the extreme conditions are that dynamic sealing performance testing of the rubber ring under different extreme conditions (high pressure, high temperature and low temperature) can be realized. The device has the characteristics of being easy and convenient to assemble and flexible and easy to use.

The invention provides a carbon tank three-way connecting device and a connecting structure thereof in a supercharged gasoline motor car. The invention belongs to the technical fields of engineering components and mechanical engineering and solves the problems that desorption measures adopted by the existing supercharged engine carbon tank cannot meet the desorption requirements of the carbon tank and easily lead to the leakage faults. The carbon tank three-way connecting device comprises a connecting body provided with three connectors, wherein a first connector and a second connector are connected through a one-way valve I; the second connector and a third connector are communicated through a Venturi channel; and the first connector is connected with the small port of the exit divergent part of the Venturi channel through a one-way valve II. The connecting structure is characterized in that the first connector of the carbon tank three-way connecting device is connected with the carbon tank through a carbon tank control valve; the second connector of the carbon tank three-way connecting device is communicated with an intake manifold; and the third connector of the carbon tank three-way connecting device is communicated with an air inlet of a supercharger. The carbon tank three-way connecting device has the advantages of simple structure, scientific and reasonable design and stable performance.

The invention relates to the technical field of fluid mechanical engineering, in particular to a structural body rotatable entry testing device. The device is characterized in that a support piece covers a water storage box and used for bearing a position adjusting assembly and a rotation emission assembly. The position adjusting assembly comprises a first-grade adjustment track used for achievingfront and back movement, a second-grade adjustment track used for achieving left and right movement and a third-grade adjustment piece used for achieving up-down movement. A dial is installed on thethird-grade adjustment piece. The rotation emission assembly comprises a rotation part and a clamping part. The clamping part is fixedly installed on the rotation part and used for clamping the structural body and providing entry rotation speed for the structure body so as to allow the structural body to enter the water in a rotatable manner. The rotation part is used for rotating the clamping part in a vertical face so as to adjust the entry angle of the structural body. The dial is used for measuring the rotation angle of the clamping part. According to the invention, precise positioning isthe space position can be achieved; by changing the distance between the structural body and the water face, change of entry speed can be achieved; and through the rotation emission assembly, entry angles of the structural body can be changed.

The invention relates to a precise assembly manipulator with a six-dimension force sensor in the technical field of mechanical engineering. The manipulator comprises an attitude adjusting platform, a six-dimension force sensor and a clamping manipulator. One end of the six- dimension sensor is positioned on the attitude adjusting platform through a bolt, and the other end is connected with the clamping manipulator. The six-dimension force sensor senses sensing information of acting force produced by the clamping manipulator when the clamping manipulator clamps a workpiece, and meanwhile conveys the sensing information to the attitude adjusting platform, which sets work information to adjust and control the attitude of the workpiece through wires. The attitude adjusting platform, by receiving the sensing information of the acting force fed back by the six-dimension force sensor, adjusts the acting force produced by the clamping manipulator when the clamping manipulator clamps the workpiece and the attitude of the workpiece. The invention can achieve the assembly of high precision and high rigidity in all six dimensions freely, and can achieve the real time adjustment of assembly attitude based on the output from the six-dimension force sensor. The invention can be applied to the production line of automatic assembly so that the labor intensity of workers can be reduced and the production efficiency and quality can be improved.

The invention relates to a testing device for a tube forming limit curve used for the hydraulic bulging technique in the mechanical engineering technical field, comprising an upper die, a lower die and a push rod, wherein, the upper die comprises an upper connecting plate and an upper insert block; the upper connecting plate is connected to a main cylinder of a hydraulic bulging machine; the upper insert block is fixed on the upper connecting plate and positioned through a pin stop; the lower die comprises fixed blocks, a lower die set and a lower insert block; the lower die set is fixed on a worktable of the hydraulic bulging machine and adopts a symmetrical structure; both ends of the lower die set have semi-cylindrical die cavities; the lower insert block is fixed inside a lower die set die cavity; the number of the fixed blocks is two; a semi-cylindrical die cavity is arranged on each fixed block; and the two fixed blocks are fixed on both ends of the lower die set and form two cylindrical die cavities respectively with the two semi-cylindrical die cavities of the lower die set. The testing device not only can make a tube be able to deal with path distortion with linearity or quasi-linearity and reach the state of limit strain but also can make the strain ratio change between -1 and 1.

The invention relates to a device for friction and wear test of a sand belt, belonging to the field of mechanical engineering technology, which comprises a driving wheel motor, a contact wheel motor, a driving wheel, a contact wheel, a guide wheel mechanism, a wedge block, a sand belt, a bracket and a base. The driving wheel and the contact wheel are respectively connected with the driving wheel motor and the contact wheel motor, the sand belt is tensioned by the guide wheel mechanism and rounds the guide wheel, the driving wheel and the contact wheel, and the back of the sand belt is in close contact with the guide wheel, the driving wheel and the contact wheel. The wedge block is arranged on the outer circumference surface of the contact wheel. The guide wheel mechanism is arranged on the bracket, and the driving wheel motor, the contact wheel motor and the bracket are arranged on the base. The invention has the simple structure and the easy manufacture, and thereby greatly facilitates preparation and test of a test piece and improves the efficiency of the friction and wear test of the sand belt.

The invention provides a method for manufacturing an air condition compressor balance block, belonging to the technical field of mechanical engineering. By means of the method, the technical problems that the production efficiency is low, the reject rate is high and the like when high manganese steel is adopted to manufacture the air condition compressor balance block in a conventional method for manufacturing the air condition compressor balance block are solved. The method for manufacturing the air condition compressor balance block comprises the following steps of: A, blanking: cutting a section made from high manganese steel materials into blanks with a length corresponding to a required length; B, pre-pressing forming: putting the blanks in a mould and extruding into process products with shapes similar to the shapes of finished products; C, softening and lubricating treatments: carrying out the softening treatment and the phosphorization and saponification lubricating treatment on the process products; D, coining forming: putting the process products subjected to softening and the lubricating treatments in the mould to carry out extrusion forming to obtain semi-finished products; and E, machining: clamping the semi-finished products on a machine tool and machining to obtain the finished products. The method provided by the invention has the advantages of low production cost, high production efficiency and the like.

The invention provides a rotary-type translation piston compressor, and belongs to the technical field of mechanical engineering, in order to solve the problem that an existing rotary-type compressor is high in elastic stiffness of a spring. The rotary-type translation piston compressor comprises an air cylinder with a piston cavity and a crankshaft with an eccentric part positioned in the piston cavity; an air cylinder blade groove is provided with a blade; a piston is sleeved on the eccentric part; the outer side surface of the eccentric part and the inner side surface of the piston are connected through a rolling bearing component; a bar-shaped concave circular arc groove which is parallel to a piston bus is formed on the outer circumference surface of the piston; the top surface of the blade is a convex circular arc curve surface; the circular arc top of the blade is embedded into the concave circular arc groove of the piston, and the top surface of the blade and the concave circular arc groove surface butt against mutually under the effect of spring force. The rotary-type translation piston compressor is applied to 1-1.5HP air conditioners, and the elastic stiffness of the spring is only required to be controlled to 2-4Kg / mm, or even lower.