113results about How to "Solve thermal deformation" patented technology

The invention discloses a manufacturing method of a lamp-cover-supporting LED tubular lamp with a self-clamping heat transmission substrate, and belongs to the technical field of supporting or hanging or connecting of lighting devices. The manufacturing method of the LED tubular lamp includes the steps that S1, the heat transmission substrate is inserted into strip-shaped clamping grooves from side ports of the strip-shaped clamping grooves; S2, after the heat transmission substrate is installed in the strip-shaped clamping grooves, a lamp cover covers a radiator; S3, the lamp cover exerts two acting forces on two T-shaped hooks, and the heat transmission substrate is installed in the strip-shaped clamping grooves in a clamped mode; S4, the radiator, the heat transmission substrate and the lamp cover form a lamp tube of the LED tubular lamp, and two end covers are installed at the two ends of the lamp tube of the LED tubular lamp. According to the lamp-cover-supporting LED tubular lamp with the self-clamping heat transmission substrate, the heat transmission substrate can be arranged in the strip-shaped clamping grooves in the clamped mode because the strip-shaped clamping grooves are formed in an installing part of the heat transmission substrate, heat dissipation efficiency can be improved, and the heat transmission substrate is prevented from thermal deformation.

The invention discloses an online testing device and testing method used in a machine tool spindle thermal error. The testing method comprises the steps of using an eddy current sensor and a thermal imaging instrument to measure in real time the temperature of a spindle temperature sensitive point and thermal deformation at the front end of the spindle in the axial direction and the radial direction of a machine tool in an actual working condition, then the temperature and thermal deformation data are transmitted to a computer through the thermal imaging instrument and a PLC respectively, through a data processing part of thermal error testing software, a temperature sensitive point temperature rise-time curve, a spindle axial thermal deformation-time curve, and a spindle radial thermal deformation-time curve are obtained, and finally a spindle thermal error model is obtained through calculation. The testing device comprises the thermal imaging instrument, the eddy current sensor, a sensor signal conditioner, the PLC, a PLC analog quantity unit, the computer and a support; the thermal imaging instrument is utilized to take the place of a temperature sensor to measure the temperature data of the spindle temperature sensitive point, and the problems that the number of temperature sensors is large, wiring is complicated, and installation is difficult in actual measurement are solved.

The invention discloses a manufacturing method for a high polymer material three-dimensional product. According to the method, a blank of the three-dimensional product is obtained through an additive manufacturing method or a mold forming method firstly, and the base materials of the blank comprise mixed high polymer materials and conductive materials. Secondly, the blank is put in an electromagnetic environment, the blank is heated until the high polymer materials are fused through an electromagnetic induction method, and the high polymer materials are fused and soak the other materials in the blank. Afterwards, the materials are slowly cooled to the room temperature, and therefore the three-dimensional product of which the shape is the same as that of the blank and the mechanical performance mainly depends on the high polymer materials is formed.

An uniform temperature type polysilicon reducing furnace comprises a bearer (1), a water jacket tube plate (10) and a furnace body (33), wherein the water jacket tube plate (10) is installed on the bearer (1); and the furnace body (33) is installed on the water jacket tube plate (10) through a flange. The uniform temperature type polysilicon reducing furnace is characterized in that the furnace body (33) is composed of a furnace cylinder inner wall (18), arc-shaped furnace outer cylinder (19) and a spherical furnace outer cylinder (20), wherein the furnace cylinder inner wall (18) facing the furnace chamber is provided with a thermoreflectance coating; Spirally arranged shoe plates (24) are installed both between the furnace cylinder inner wall (18) and the arc-shaped furnace outer cylinder (19) and between the furnace cylinder inner wall (18) and the spherical furnace outer cylinder (20). The bottom of the arc-shaped furnace outer cylinder (19) is provided with a cooling water outletand inlet (26) for cooling the furnace body (33). The cooling water between the furnace cylinder inner wall (18) and the arc-shaped furnace outer cylinder (19) and the spherical furnace outer cylinder (20) spirally rises to a steam outlet (23) arranged at the top of the furnace body and is discharged out of the furnace body (33). The joint of an electrode sleeve (12) and a water jacket tube plate(10) is provided with a silk screen or semicircular capillary cooling component (36). The furnace core space outlets of a raw material gas nozzle (32) and a tail gas outlet duct (5) are provided withporous or cancellate filter mantles (37). The furnace provided by the invention has advantages of large size, good cooling effect of the thick tube plate, uniform furnace velocity field and temperature field and remarkable energy-saving effect.

The invention discloses a dual-alloy nanocrystal rare earth permanent magnet and a preparation method therefor. The preparation method comprises the following steps of (1) preparing rapidly quenched ARE-Fe-B magnetic powder, wherein the content of ARE is greater than or equal to 12%, and ARE is selected from one or more than two kinds of mixed rare earths of La, Ce and Y; and preparing rapidly quenched PRE-Fe-B magnetic powder, wherein the content of Fe is greater than or equal to 82%, and PRE is rare earth Nd and / or Pr; and (2) performing mixing on the above-mentioned two kinds of magnetic powder, and carrying out discharge plasma sintering to obtain the isotropous nanocrystal rare earth permanent magnet. By taking the low-cost rare-earth-rich alloy and earth-earth-less iron-rich nanometer composite alloy as the raw materials of the magnetic powder, the material cost of the magnet is lowered; the sintering performance and the thermal deformation performance of the ally are improved; by virtue of the discharge plasma sintering technology, quite high fusion between the two kinds of magnetic powder with relatively high performance difference is realized, so that a magnetic hysteresis loop with single-alloy magnet characteristic is obtained; and in addition, by improving the square degree of the loop, the magnetic performance optimization is realized.

The invention provides a preparation method of high-strength high-temperature-resistant glass cotton. The preparation method comprises the following steps: firstly preparing glass liquid by using waste glass, calcite, nano aluminum oxide, borax, carbon nano tubes, calcium oxide, magnesium silicate and titanium dioxide, placing the glass liquid in a glass cotton centrifugal machine for centrifuginginjection, preparing glass fibers, uniformly spraying a glass cotton binder to the surfaces of the glass fibers, and conveying the glass fibers to a curing furnace for curing after cotton collectionby a cotton collecting machine, to obtain the glass cotton. The prepared glass cotton has good mechanical strength. It can be known that the elasticity of the glass cotton is good according to a numerical value of a breaking elongation, so a thermal deformation problem caused by temperature shock is prevented; a heat conductivity coefficient of the glass cotton is 0.007 w / mk, demonstrating that the glass cotton has good heat conductivity, and the glass cotton is prevented from being so hot that the use effect and the service life are affected. So the prepared glass cotton has extensive application prospect.

The invention relates to the field of precision measurement technology and the field of optical engineering and in particular relates to a portable combined zero setting high precision laser large working distance auto-collimation device and method. The device comprises a light source, a collimating mirror, a reflector, and a feedback imaging system. The method makes reflected light beams return to the image plane center of the feedback imaging system by adjusting the reflector and obtains the angle change of the surface of a measured object by means of an angle deflection measuring device on the reflector. The reflector is added to a conventional auto-collimation angle measuring system, so that the problem that measurement is impossible because reflected light of a measured object deviates from the measuring system is solved and the auto-collimation working range is increased on the condition of the same working distance or the working distance is increased on the condition of the same working range. Owing to the specific design of the collimating mirror, the feedback imaging system and the reflector, the device is small, portable, and high in measurement precision, can monitor the stability of measurement environments, and can perform measurement rapidly.

The invention relates to a grid mesh, which is used for an ionic optical system of an ionic source. The grid mesh is provided with a grid hole area with grid holes, a plurality of thermal stress slots are formed in the grid mesh from the edge of the grid hole area in an outward radiation manner, and the thermal stress slots penetrate through the upper surface and the lower surface of the grid mesh. The invention further provides an ionic source using the grid mesh. The radiating thermal stress slots are formed in the grid mesh, so that the thermal deformation problem of the melting-resistant metal plane grid mesh can be thoroughly solved, the uniformness and stability of the ion beam stream can also be maintained, the long-term and repeated ionic source working under high-temperature environment can be met, and the ionic source performance repeatability and the ion beam processing technique uniformness can be improved.

The invention relates to the filed of high temperature valve devices, and provides a high temperature valve, which comprises a valve body and a valve plate, wherein the valve plate has a cavity structure; the cavity structure comprises an air inlet and an air outlet which are positioned on the top of a cavity; and the air inlet is connected with an air inlet pipe. The valve plate adopts a heat-resistant steel cavity structure and hollow air-cooled heat radiation, an inner cavity is externally stuck with a high-temperature heat insulating material, and an outer layer of the high-temperature heat insulating material is provided with a high-temperature refractory material to further reduce the temperature tolerated by heat-resistant steel and prolong the service life of the heat-resistant steel. Simultaneously, compared with the prior water-cooled high temperature valve, the high temperature valve saves water resources and greatly reduces the production cost. In addition, the inner cavity of the valve plate is made of a heat-resistant steel material and compared with the prior heat-resistant steel material, the high temperature valve saves the production cost, reduces cracking of the valve plate refractory material caused by expansion of the heat-resistant steel, and solves the problem of thermal deformation.

The invention discloses a thermo-stable oriented silicon steel making method. The method includes a scanning step. In the scanning step, an ultraviolet femtosecond laser with the wavelength of 343 nm is adopted for performing scanning on the surface of a single side of an oriented silicon steel sheet so as to carve multiple trench lines perpendicular to the rolling direction of oriented silicon steel. By means of the thermo-stable oriented silicon steel making method, iron loss can be substantially reduced.

The invention discloses a finger tip tight sealing sheet picosecond ultra-fast laser cutting quality control method. The deformation problem caused by local heat stress introduced during picosecond laser cutting can be solved. According to the method, a manner of segmented cutting is adopted, a part is divided into symmetrical areas on the macro level according to the structural characteristic tobe cut, a ring is divided into small arc segments, and an outer circle and an inner circle are cut in a staggered manner; and when each small arc segment is cut, the cutting trajectory is layered, thecutting speed at different layer numbers changes according to a certain rule, the chip breaking falling behavior of each small arc segment material is controlled, and therefore a cutting effect of stress balance in each cutting area is achieved as a whole.

The invention discloses a deslagging waste heat utilization device for a circulating fluidized bed boiler. By the adoption of the deslagging waste heat utilization device for the circulating fluidized bed boiler, the situations that heat deformation of a deslagging pipe is caused, and leakage is also caused due to the fact that an inner pipe is abraded by bottom slag are prevented. The deslagging waste heat utilization device for the circulating fluidized bed boiler comprises a deslagging hole, a deslagging connector, a collection header, a deslagging heat exchange pipe, a plurality of reinforcing ribbed plates, a distribution header, a cooling water inlet pipe, a cooling water outlet pipe, a three-dimensional expansion joint, a cooling air inlet, the deslagging pipe, a manual gate valve, an electric gate valve, an accident deslagging pipe, an underpant-shaped tee joint, an outer pipe, the inner pipe, a plurality of guide plates, pins and guide cavities. The deslagging connector is in a cone shape. The upper end opening of the deslagging connector is connected with the boiler deslagging hole, and the lower end opening of the deslagging connector is connected with the upper end of the collection header. An annular cavity is formed by the deslagging heat exchange pipe by concentrically sleeving the small-diameter inner pipe with the large-diameter outer pipe. The guide plates with the same width are welded between the wall of the inner pipe and the wall of the outer pipe, and the annular cavity is equally divided into the guide cavities not communicating with one another in the circumferential direction by the guide plates. The annular reinforcing ribbed plates which can prevent the deslagging heat exchange pipe against heating expansion and deformation are arranged on the outer wall surface of the outer pipe of the deslagging heat exchange pipe.

The invention relates to a method for measuring the thermal error of a grinding wheel spindle of a grinder. The method comprises the following specific steps: 1. arranging non-contact displacement sensors; 2. determining the position of each sensor relative to the grinding wheel spindle; 3. measuring the thermal deformation of the spindle; and 4. modifying the thermal deformation of the grinding wheel spindle and the random measurement error. By solving the problem of measuring the thermal deformation of the grinding wheel spindle of the grinder and providing the method for determining the position of the sensor relative to the grinding wheel spindle, the invention can accurately determine the thermal deformation in X and Y directions. The method is also applicable to the measurement of thermal deformation of a machining center spindle without the function of spindle location.

The invention provides a double-permanent-magnetic-tube two-end symmetric excitation cylindrical low frequency vibration calibration table with magnetic field tracking compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two cylindrical permanent magnetic tubes are symmetrically installed at two ends of an electromagnetic drive structure and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. A center magnet yoke is provided with a compensation coil, and a formed compensation magnetic field carries out synchronous tracking compensation on the influence of an armature reaction. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the double-permanent-magnetic-tube two-end symmetric excitation cylindrical low frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and a high precision and large stroke high performance low frequency vibration calibration table technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

The invention provides a four-axis optical fiber laser welding device and belongs to the technical field of welding equipment. The four-axis optical fiber laser welding device comprises a machine table, a welding mechanism, a locating mechanism, a cooling mechanism, a power supply mechanism and a control mechanism. The locating mechanism comprises an X-axis device horizontally and fixedly connected with the top surface of the machine table, a Z-axis device perpendicularly connected with the top surface of the X-axis device, a Y-axis device perpendicularly connected with the side face of the Z-axis device and a C-axis rotary shaft connected with one end of the Y-axis device. The welding mechanism comprises a laser welding head arranged on the C-axis rotary shaft, a laser generator arrangedinside the machine table and a gas shielding device. A control system comprises an industrial personal computer arranged inside the machine table, a displayer, a keyboard and a mouse, wherein the displayer, the keyboard and the mouse are arranged beside the machine table and matched with the industrial personal computer for use. The four-axis optical fiber laser welding device can realize automatic welding, substantially reduces the manual workload and the requirement for the special technical skills, reduces human errors and the manpower requirement and improves the production efficiency andproduct quality.

The invention discloses a vehicle light-duty multi-functional engine hood. The vehicle light-duty multi-functional engine hood comprises an inner plate and an outer plate, a supporting plate is further arranged between the inner plate and the outer plate, the supporting plate is attached to the lower surface of the outer plate, the outer plate is made of carbon fiber composite materials, the supporting plate is made of interpenetrating network resin composite materials, the inner plate is made of aluminium alloy materials, and the interpenetrating network resin composite materials are CCF800Hcarbon fiber resin composite materials. Compared with an existing technology, the vehicle light-duty multi-functional engine hood has the following advantages that the vehicle lightweight technology is effectively achieved; the advantages of high strength and hardness are achieved; requirements of strength, stiffness, concave resistance and the like in the using process of the engine hood are met;in the process of being subjected by external force and collision, the safety of drivers and pedestrians in the process of collision can be furthest protected; the problem of thermal deformation of acarbon fiber hood is perfectly solved; and production process is simple, production cycle is short, and the costs of development of a lot of moulds are saved.

The invention discloses a heat transfer substrate self-clamping type LED (light emitting diode) tubular lamp supported by a lamp shade, and a heat radiator of the LED tubular lamp, and belongs to the technical fields of support, suspension or connecting devices of illumination devices. The heat radiator of the LED tubular lamp comprises a heat radiating main body (1) and a heat transfer substrate mounting part (2), wherein the cross section of the heat radiating main body (1) is in a hollow semi-cylinder shape. The heat radiator is characterized in that the heat transfer substrate mounting part (2) is connected with a heat transfer bottom surface (11) and is provided with bar-shaped clamping grooves (21), and the bar-shaped clamping grooves (21) are used for mounting a heat transfer substrate (3). The heat transfer substrate self-clamping type LED tubular lamp supported by the lamp shade has the advantages that as the heat transfer substrate mounting part is provided with the bar-shaped clamping grooves, the heat transfer substrate can be clamped in the bar clamping grooves, and the heat transfer substrate is fixedly arranged on the heat radiator without screws, so the assembling efficiency is high, and the requirement of automatic and quick production is met; the heat transfer substrate is clamped in the bar-shaped clamping grooves and is in contact with multiple surfaces of the bar-shaped clamping grooves, so the heat radiating efficiency is improved, and the heat deformation of the heat transfer substrate is avoided.

The invention relates to a permanent magnet synchronous heat pipe cooling electric spindle, comprising a spindle housing, wherein a spindle is mounted in the spindle housing, the two ends of the spindle are respectively supported by a front bearing and a rear bearing, the front bearing and the rear bearing are respectively mounted on a front bearing assembly and a rear bearing assembly, and the heat generated by the front and rear bearings can be greatly transmitted; a heat pipe base is fixed in the middle of the spindle housing, a heat dissipation chamber is designed at the rear end of the spindle housing, and an inorganic heat pipe passes through the heat pipe base, with a condensation end inserted into the front bearing assembly and passing through the rear bearing assembly, and an evaporation end extending into the heat dissipation chamber to absorb the heat generated by the bearings and a motor stator to a certain extent; and at the same time, a heat sink is arranged at the evaporation end of the heat pipe. The electric spindle is improved relative to other spindle devices in internal structure, heat pipe mounting position, motor selection and cooling method; a permanent magnet synchronous motor is selected, so the rotor has low heat generation; and the overall structure is simple, the operation is stable, and the service life of the electric spindle can be prolonged.

The invention provides a rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the rectangular open magnetic field type low-frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and the high performance low frequency vibration calibration table is provided for low-frequency / ultra-low frequency vibration calibration.

The invention discloses a shield sealing contact surface restoring method, which comprises a fusion welding filling step, wherein the fusion welding filling step comprises at least two circulations, in each circulation, grooves formed in the sealing contact surface are subjected to the fusion welding filling, and the stress caused by the fusion welding is relieved; and bead welds formed by the fusion welding filling are ground to the original plane height. The shield sealing contact surface restoring method avoids the thermal deformation problem of the original process in the fusion welding filling process, so operators can also control the fusion welding filling in the process, and the planeness of the final control is realized. The shield sealing contact surface restoring method has the advantages that the cost is lower, the restoring work period is short, the effect is good, and the sealing performance is good.

The invention relates to the technical field of ball mill auxiliary devices, and discloses a ball mill heat dissipation barrel device capable of avoiding grinding overheating. The ball mill heat dissipation barrel device comprises a shell, the interior of the shell is rotatably connected with a first connecting shaft, the outer side of the first connecting shaft is rotatably connected with a sun gear, and the outer side of the sun gear is engaged with a planetary gear. The outer side of the planetary gear is rotationally connected with a first magnetic pole, the outer side of the sun gear is rotationally connected with a first coil, and the interior of the shell is rotationally connected with a second coil. According to the ball mill heat dissipation barrel device capable of avoiding grinding overheating, through connection of the shell and the second coil, the problem that the internal temperature of a ball mill of an existing device is too high is solved, the situation that parts inthe ball mill are damaged by a large amount of heat generated by continuous friction of a grinding body is avoided, rapid heat dissipation is achieved through new magnetofluid materials, the internalparts are effectively protected, the working efficiency is improved, the practicability is improved, and the use is convenient.

The invention belongs to the technical field of precision measurement and the field of optical engineering and specifically relates to a portable array zeroing high precision laser large working distance auto-collimation device and method. The device consists of a light source, a collimating mirror, a reflecting mirror and a feedback imaging system; according to the method, via adjustment of the reflecting mirror, a reflected light beam is enabled to return to a center of an image plane of the feedback imaging system; an angular deflection measurement device on the reflecting mirror is used for obtaining angular variation of a surface of an object being tested. Because the reflecting mirror is added in a traditional auto-collimation angle measurement system, a problem that measurement cannot be realized when light reflected by the object being tested is deviated from a measurement system can be prevented; an auto-collimation working scope can be expanded while working distance remains the same or working distance is increased while the working scope remains the same; via specific design of the collimating mirror, the feedback imaging system, the reflecting mirror and the like, the portable array zeroing high precision laser large working distance auto-collimation device is enabled to be small in size, high in portability and great in measurement precision; stability of a measurement environment can be monitored, and a technical advantage of rapid measurement can be gained.

The invention relates to a moulding press for reinforcing a pressureproof steel plate. The moulding press is characterized in that the device comprises an upper mould (2), a lower mould (4) and a steel support (5), wherein the upper mould (2) is arranged above the lower mould (4), the upper part of the upper mould (2) is connected with an oil cylinder (1), the steel plate is placed on the lower mould (4), and the lower mould (4) and the oil cylinder (1) are both fixed on the steel support (5). The invention adopts simple process technology to reinforce the steel plate, thus greatly reducing the production cost including steel consumption, electric energy loss and labor cost, avoiding the thermal deformation problem of steel caused by the traditional reinforcement method using the reinforcing rib and increasing production efficiency and product quality.

The invention belongs to the technical field of precision measurement and the field of optical engineering and particularly relates to a portable high-dynamic-precision large-working-distance auto-collimation device and method. The device is composed of a light source, a collimating mirror, a reflecting mirror and a feedback imaging system. The method includes the steps that the reflecting mirror is adjusted, reflected light beams return to the center of the image surface of the feedback imaging system, and the angle change of the surface of a measured object is acquired through an angle deflection measuring device on the reflecting mirror. Due to the fact that the reflecting mirror is additionally arranged on a traditional auto-collimation angle measuring system, the problem that due to the fact that reflected light of the measured object deviates from the measuring system, measurement cannot be carried out can be avoided, and then the advantage that the auto-collimation working range is increased at the same working distance or the working distance is increased within the same working range is achieved; in addition, through the specific design of the collimating mirror, the feedback imaging system, the reflecting mirror and the like, the device and method further have the technical advantages that the device is small, portable and high in measuring precision; the assembly process of the measured object can be monitored in the whole course; measurement is rapid.

A double-magnetic-circuit symmetrically-excited cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure capable of realizing magnetic field tracking compensation belongs to the technical field of vibration measurement. A cylindrical enclosed magnetic field structure is provided, two cylindrical permanent magnets are symmetrically installed on two ends of a central magnet yoke, and same magnetic poles are arranged in an opposite manner; two symmetrical enclosed magnetic circuits are formed through magnet yokes, the magnetic induction intensity high in uniformity is generated in an air gap; the surface, adjacent to the air gap, of the magnet yoke is provided with an array-type microstructure arranged in a deep channel mode, and the eddy current loss can be effectively inhibited; and a central magnet yoke is provided with a compensation coil, a provided current is opposite to the current in a working coil in direction and is proportional to the current in the working coil in phase synchronous tracking and amplitude, and a formed compensation magnetic field is capable of carrying out synchronous tracking compensation on the influences of an armature reaction. According to the invention, a large stroke, high magnetic field uniformity, a large thrust and linear electromagnetic driving force characteristics can be considered at the same time, and a high-precision and large-stoke electromagnetic shake table magnetic circuit structure technical scheme is provided for low-frequency / ultralow-frequency vibration calibration.

The invention discloses an ironing board of an asphalt paver with downward deformation by being pre-pressed by strut and pull rods. The ironing board comprises a base segment ironing board and a mechanically assembled and widened ironing board constituted by a plurality of lengthened segment ironing boards, wherein the base segment ironing board is formed by connecting two single-segment base segment ironing boards; a base segment ironing board support is arranged on each single-segment base segment ironing board, a lengthened segment ironing board support is arranged on each lengthened segment ironing board, and a plurality of strut and pull rods are arranged between the two base segment ironing board supports and a plurality of lengthened segment ironing board supports; and the left side and right side of the mechanically assembled and widened ironing board are symmetrically gradually downwards inclined and deformed along the normal line direction of the bottom surface of the mechanically assembled and widened ironing board under the action of the plurality of strut and pull rods, the downward inclination deformation amount h is 0-60mm, and the greater the width of the mechanically assembled and widened ironing board, the bigger the value of h. The ironing board disclosed by the invention has the advantages of reasonable design, convenience in processing and manufacturing, convenience and quickness in operation, low implementation cost, wide range of application, and capability of effectively solving the thermal deformation problem of the ironing board of the paver during the working process.

The invention provides a rectangular open magnetic field type electromagnetic vibration table magnetic circuit structure with double-magnetic-circuit two-end symmetric excitation, belonging to the field of vibration measurement technology. A rectangular open type magnetic field structure design is provided. Two permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. According to the rectangular open magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, the disadvantages in the existing technical scheme can be effectively solved, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

A cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure centripetally excited by a long permanent magnetism tube belongs to the technical field of vibration measurement. A cylindrical enclosed magnetic field structure is provided, the permanent magnetism tube is coaxially assembled in the inner part of a long cylindrical outer magnet yoke in a bonded manner, magnetic poles of the inner cylindrical surface of the permanent magnetism tube are identical in polarity, an enclosed magnetic circuit is formed through magnet yokes, and a magnetic field high in uniformity is generated in an air gap. After a working coil is powered on, the working coil in the magnetic field is affected by a Lorentz force and generates a precise and controllable electromagnetic driving force. The surface, adjacent to the air gap, of a central magnet yoke is provided with an array-type microstructure arranged in a deep channel mode, and the eddy current loss can be effectively inhibited. According to the invention, a large stroke, high magnetic field uniformity, a large thrust and linear electromagnetic driving force characteristics can be considered at the same time, defects of an existing technical scheme are effectively overcome, and a high-precision and large-stoke electromagnetic shake table magnetic circuit structure technical scheme is provided for low-frequency / ultralow-frequency vibration calibration.