102 results about "Thermal displacement" patented technology

The invention provides a rotary table bearing-torque motor thermal vibration coupling modeling method, and relates to the technical field of machine tool reliability analysis. Comprising the steps of calculating bearing restoring force, torque and elastic rigidity; giving a dynamic balance equation of the main shaft system; unbalanced magnetic pulling force and unbalanced mass excitation are calculated; a displacement field is solved, and load changes caused by the displacement field are transmitted to the thermal model; the contact force borne by the bearing is updated by considering the load effect related to displacement, and the friction heat generation of the bearing and the heat generation of each part of the motor are calculated; calculating thermal deformation and thermal displacement of the bearing; thermal resistance among nodes is calculated, and a temperature field equilibrium equation is given through a thermal resistance network to achieve rapid thermal-mechanical coupling analysis; the thermal equilibrium equation is solved to calculate temperature response; importing the latest temperature into the kinetic model; lubricating grease viscosity and bearing thermal deformation are updated; and repeating the steps to finally obtain the main shaft displacement field and temperature field response. The method is high in accuracy, high in universality, low in test cost and high in test efficiency.

According to the present invention, a thermal displacement correction device for an industrial machine comprises a model storage unit that stores a model of an industrial machine, a temperature data acquisition unit that acquires temperature data for the industrial machine, a thermal displacement amount calculation unit that calculates a thermal displacement amount for the industrial machine when a mobile unit of the industrial machine has moved to each of a plurality of predetermined calculation points on the basis of the model and the temperature data, a thermal displacement amount map calculation unit that calculates thermal displacement amount data for the industrial machine when the mobile unit has moved to an interpolation point that is different from the plurality of calculation points on the basis of the thermal displacement amount at each of the plurality of calculation points, and a correction value calculation unit that calculates a correction value for a command position for the mobile unit on the basis of the thermal displacement amount data.

The invention relates to the technical field of industrial control, in particular to an error compensation method for numerical control machining of an automobile stamping die, which comprises the following steps of: acquiring temperature of a plurality of thermo-sensitive points of a numerical control machine tool and thermal displacement data of a tool nose; the effective thermal driving potential is calculated by considering the time lag effect of the temperature level and the historical temperature change; calculating a thermal phase direction gradient in combination with the temperature difference value and the nonlinear gain; combining the effective thermal driving potential and the thermal phase direction gradient into a feature vector to train a support vector regression model; and inputting the feature vector in real time to obtain a compensation value, and superposing the compensation value to the coordinate instruction by dynamic origin offset. The method can accurately reflect the thermal inertia, capture the dynamic evolution of the thermal state, comprehensively represent the thermal state to improve the adaptability of the model, and correct the thermal error in real time, thereby improving the machining precision and surface quality of the automobile stamping die.

The invention relates to the technical field of fusion reactors, and particularly discloses a fusion reactor engineering pipeline positioning compensation device. The device comprises a rack, a positioning mechanism and a first guide rail. An assembly space is defined by the machine frame and used for containing a pipeline. The positioning mechanism comprises a driving part and an abutting part, the driving part is installed on the rack and can drive the abutting part to apply radial pressure to the pipeline, and accurate positioning of the pipeline is achieved; the first guide rail is installed on the engineering support and extends in the axial direction of the pipeline, and the rack is in sliding fit with the first guide rail, so that the whole device can move in the axial direction of the pipeline. By means of the structure, accurate positioning of the pipeline in the radial direction and thermal displacement compensation of the pipeline in the axial direction can be achieved at the same time, the problems of stress and displacement caused by thermal expansion and cold contraction and vibration of the pipeline in a fusion reactor are effectively solved, and the device has the advantages of being high in positioning accuracy, good in compensation capacity and high in reliability.

The utility model belongs to the technical field of installation supports, and particularly relates to an electromechanical engineering installation positioning support which comprises a hanging rod connected to the bottom of a wall top and used for hanging a pipeline below the wall top and a lock sleeve fixedly installed at the bottom end of the hanging rod and used for fixedly connecting the pipeline with the hanging rod. A sliding assembly is connected between the wall top and the top end of the hanging rod, and when the pipeline generates thermal displacement, the top end of the hanging rod is driven by the lock sleeve to generate adaptive displacement along the wall top through the sliding assembly, so that the hanging rod and the pipeline are always kept in a vertical state, and the stress load of the hanging rod is reduced. And when the pipeline has thermal displacement or is in a normal state, the suspender and the pipeline are kept in a vertical state, so that the stress load of the suspender can be further reduced, and the problem that the pipeline is easy to lose stability in the mounting and using processes is solved.

The invention belongs to the technical field of numerical control machine tools, and relates to a thermal error compensation method and system for a large bridge type gantry machining center, and the system comprises a comprehensive data collection module, a key point determination module, a thermal error modeling module, a compensation execution module and a compensation optimization module. The comprehensive data acquisition module is used for synchronously acquiring three-way thermal displacement change data of a tool nose point and key point temperature data; the key point determination module is used for screening a representative key point temperature set required by modeling according to correlation and a classification principle; the thermal error modeling module is used for establishing a temperature difference-based multiple linear regression compensation model by taking a reference temperature as a reference; the compensation execution module is used for converting the compensation model into a real-time PLC program, and calculating and outputting a compensation amount to a servo system; and the compensation optimization module iteratively adjusts the compensation correction coefficient K through a dichotomy method, and verifies and optimizes the compensation effect. The problems that an existing thermal error compensation method is single in compensation object, difficult to debug and difficult to apply in an engineering mode can be effectively solved.

The invention discloses a numerical control machine tool workbench thermal displacement correction method and structure, a reading head assembly is fixed on a machine tool body, a measuring scale assembly is fixed on a workbench, the reading head assembly and the measuring scale assembly are located on the same straight line, the axis of a main shaft and the reading head assembly are located in the same plane, and the plane is perpendicular to the moving direction of the workbench. The screw rod generates heat to generate thermal displacement, the coordinates of the workbench integrally deviate, and the measuring scale assembly automatically aligns the originally set coordinates after detecting the deviation of the coordinates, so that the thermal displacement generated by the screw rod is corrected; when the working table deforms, the measuring scale assembly deforms together, the coordinate position of the working table is corrected through the measuring scale assembly, the position of the reading head assembly relative to the machine tool spindle in the moving direction of the working table is accurate, at the moment, the relative size between machining features of parts on the working table is accurate, and therefore the effect of correcting the thermal displacement of the working table is achieved. Thermal displacement correction is conducted on the numerical control machine tool workbench in real time, and the positioning accuracy of the workbench is guaranteed.

The invention relates to the technical field of conical sealing rotary valve production, in particular to a pretightening force compensation control device for a conical sealing rotary valve. The device comprises a pre-tightening body, a cylinder, a piston, a ball, a displacement sensor, a pressure sensor and a controller for control, the cylinder, the piston, the ball, the displacement sensor, the pressure sensor and the controller are arranged in the pre-tightening body, in the device, after the conical surface of the rotor is abraded or thermally displaced, the ball descends, and the piston also descends under the action of a wave spring and air pressure; the displacement sensor detects the displacement of the piston in real time, the pressure sensor detects the air pressure in the air cylinder in real time and transmits signals to the controller, the controller immediately calculates the needed air pressure and controls the proportional valve pressure regulator to complete pressure regulation and recover the conical surface sealing force, manual intervention is not needed, and closed-loop control ensures that the sealing force is constant.

The application provides a thermal compensation device and method of a machine tool electric spindle and a numerical control machine tool, and the thermal compensation device comprises a displacement detection device and a control device, a detection part of the displacement detection device is arranged on a tool holder connected with the spindle, the detection part of the displacement detection device and a detection surface of the tool holder are arranged in a vertical direction, and the detection part of the displacement detection device is arranged opposite and parallel to the detection surface of the tool holder; the displacement detection device detects thermal displacement of the spindle in the vertical direction by detecting distance change between the detection part of the displacement detection device and the detection surface of the tool holder; the control device is connected with the displacement detection device, the control device is used for acquiring data detected by the displacement detection device, and the position of the spindle in the vertical direction is adaptively adjusted according to the data detected by the displacement detection device. The thermal compensation device of the machine tool electric spindle can effectively solve the technical problems of the thermal compensation device of the machine tool electric spindle in the prior art, such as complex structure and poor anti-interference ability.

The invention relates to the technical field of aluminum single plate rolling mills, and discloses a rolling mill and method for manufacturing aluminum single plates, the rolling mill comprises a base and a roller machine frame, the left side of the top of the base and the bottom of the roller machine frame are fixedly installed, and a self-adaptive roller bending force compensation mechanism is arranged on the roller machine frame. According to the rolling mill and method for manufacturing the aluminum veneer, the temperature change of the bearing seat is sensed through the bimetallic strip, and a thermal displacement signal is amplified through a structure composed of the first rack, the first gear, the second rack, the third rack and the second gear; and finally, the output pressure of the first oil pressure pushing hydraulic cylinder and the second oil pressure pushing hydraulic cylinder is accurately adjusted by controlling the opening degree of a valve rod of the pilot-operated type hydraulic valve, so that self-adaptive control over the roll bending force of the supporting roll is achieved, the plate shape defect caused by thermal expansion of the working roll can be automatically compensated, the plate shape quality and flatness of the aluminum veneer are remarkably improved, and the service life of the aluminum veneer is prolonged. The problem of middle waves is effectively solved, meanwhile, the synchronism of roll bending force on the two sides is guaranteed through the hydraulic synchronous controller, and the rolling precision is further guaranteed.

The invention relates to the technical field of fused salt heat storage, in particular to a pipeline connecting device for absorbing thermal displacement of a fused salt storage tank. The device comprises a flexible connection assembly; the flexible connection assembly vertically extends, the top of the flexible connection assembly is detachably connected to the salt inlet pipe or the fused salt pump shaft and arranged on the periphery of the salt inlet pipe or the fused salt pump shaft in a sleeving mode, and the bottom of the flexible connection assembly is detachably installed on the top of the fused salt storage tank. The flexible connection assembly absorbs thermal displacement generated by the fused salt storage tank and the salt inlet pipe or the fused salt pump shaft; the flexible connection assembly can surround the periphery of the salt inlet pipe or the molten salt pump shaft to form a circumferential closed structure. And the flexible connection assembly can be circumferentially unfolded and separated from the salt inlet pipe or the molten salt pump shaft. The top and the bottom of the flexible connection assembly are detachably connected with the salt inlet pipe or the fused salt pump shaft and the fused salt storage tank, so that the flexible connection assembly can be circumferentially unfolded and separated from the salt inlet pipe or the fused salt pump shaft in the disassembly state, and replacement can be completed without cutting off the salt inlet pipe or drawing out the fused salt pump shaft.

An intelligent warm-up method of machine tool, applicable to a machine tool, includes: a step of, based on temperature change data and thermal displacement data of a spindle measured at different time points, establishing a thermal compensation model; a step of, while the machine tool performs a warm-up process, inputting temperature change values measured at least one component of the machine tool at intervals to the thermal compensation model to obtain corresponding thermal-displacement estimated values of the spindle at different time points and changes of thermal displacement values at individual time points; and, a step of, based on the changes of the thermal displacement values at the individual time points, deriving corresponding warm-up completion degrees.

This invention provides an optimization method for thermal deformation compensation of alloy plates based on digital twins, relating to the field of data processing technology. The method includes: collecting multi-source heterogeneous data of the alloy plate to be processed; performing finite element simulations on multiple processing conditions to obtain a residual stress field sample set; performing dimensionality reduction processing on the residual stress field sample set to determine a low-dimensional parameterized expression model; constructing a thermo-mechanical coupling deformation model of the alloy plate by combining the low-dimensional parameterized expression model and processing environment temperature data; mapping the residual stress field to the deformation of the alloy plate structure in the processing coordinate system through the thermo-mechanical coupling deformation model of the alloy plate; constructing a rapid prediction model of the machine tool temperature field; calculating the thermal displacement error of the machine tool structure through the rapid prediction model of the machine tool temperature field; fusing the deformation of the alloy plate structure and the thermal displacement error to obtain a comprehensive deformation error; and calculating the control variables in the processing process based on the comprehensive deformation error to obtain the optimal compensation parameters.

The invention discloses a thermal displacement compensation device of an electric spindle, a numerical control machine tool and a compensation method of the numerical control machine tool. The device comprises an eddy current displacement sensor and a compensation system. The eddy current displacement sensor comprises a probe and a post-stage processing circuit, the probe is provided with a first coil, a second coil and a multi-channel chip, the first coil is connected with a first inductance input channel of the multi-channel chip to output a first digital signal, and the second coil is connected with a second inductance input channel to output a second digital signal; the post-stage processing circuit converts the first digital signal into a first voltage signal and a pulse signal, and converts the second digital signal into a second voltage signal; and the compensation system performs temperature drift compensation on the first voltage signal according to the second voltage signal, and performs axial compensation on the motorized spindle by using the pulse signal and the compensated first voltage signal. According to the scheme, the accuracy of displacement measurement of the motorized spindle is improved, and the thermal displacement compensation effect of the spindle is guaranteed.

The present invention provides a detection device that can reduce the impact of thermal displacement on the detection target while suppressing the occurrence of problems. [Solution] The detection device is applied to a mechanical device. The mechanical device comprises a rotating body and a hub bearing. The hub bearing has a first bearing portion fixed to a base portion, a second bearing portion to which the rotating body is fixed, and rolling elements, and rotatably supports the second bearing portion with respect to the base portion. The detection device comprises an annular target member 80 fixed to the second bearing portion and extending in the circumferential direction of the second bearing portion with respect to the rotation center of the second bearing portion, and a signal output provided at a position facing the detection target portion in the axial direction. A portion of the target member 80 in the circumferential direction is a thermal displacement portion Rb. The thermal displacement portion Rb is a portion of the target member 80 in which the amount of thermal displacement in the axial direction due to temperature changes of the target member 80 is larger than that of the fixed portion Ra other than the thermal displacement portion Rb.

The utility model discloses a viscous damper simultaneously satisfying bearing and large displacement, which comprises an upper connecting plate connected with a pipe clamp accessory and a lower connecting plate arranged opposite to the upper connecting plate, the lower part of the upper connecting plate is fixedly connected with an upper shell, the upper part of the lower connecting plate is fixedly connected with a lower shell, a sealing sleeve is connected between the upper shell and the lower shell, and the sealing sleeve is fixedly connected with the lower shell. Damping liquid is arranged in an inner cavity of the lower shell, a plunger extending into the damping liquid is fixedly arranged on the lower portion of the upper connecting plate, at least two lower lug handles which are oppositely arranged are arranged at the lower end of the plunger, and the lower lug handles are fixedly connected with tension springs which are obliquely arranged. According to the viscous damper, the requirement for large thermal displacement of a pipeline can be met while vibration reduction of the pipeline is achieved, the tension spring can have the stretching buffering effect on the plunger, the supporting effect and the vibration reduction effect are achieved, and the viscous damper can meet the requirement for large displacement when the pipeline vibrates while bearing the load of the pipeline; and the multifunctionality of the viscous damper is improved.

The invention discloses a multi-wire cutting machine cutting chamber and a thermal displacement control mode, and relates to the technical field of multi-wire cutting machines, the multi-wire cutting machine cutting chamber comprises a structural part frame, and the structural part frame comprises a base, a main shaft mounting seat, a fixing seat, a left stand column and a right stand column; the main shaft mounting seat and the fixed seat are connected through the left and right stand columns to form an integral closed frame; a double-shaft tilt angle sensor is arranged on the workpiece clamp; and the temperature control assembly comprises a control device, a plurality of temperature sensors, and a temperature control medium source, a temperature adjusting unit, a distribution valve group, a plurality of temperature control channels and a liquid return pipeline which are sequentially connected to form a circulation loop. The main shaft mounting base and the fixing base are connected through the left stand column and the right stand column to form an overall closed frame, the rigidity of the frame is enhanced, the frame is provided with a plurality of independent temperature control channels, and dynamic keeping of cutting precision is achieved through real-time feedback of the double-shaft tilt angle sensor and active adjustment of the temperature control assembly.

The utility model discloses a kind of efficient vertical packing gland gas heat exchangers, including pressure-bearing shell, for conveying high-temperature gas's pipe, for conveying low-temperature gas's shell and heat exchange part. Pipe is blocked by heat insulation sleeve pipe and heat insulation layer and is transmitted to shell wall and shell course upper cavity, upper tube sheet can be moved up and down to compensate thermal expansion difference, shell course sets up packing gland sealing and solves thermal displacement compensation problem, support cylinder and annular baffle cooperation guide low-temperature gas to flow through all heat exchange area, improve heat exchange efficiency;Baffle plate enhances shell course gas turbulence, and guide distribution blade optimizes upper cavity area airflow distribution. The utility model is through multiple heat insulation, displacement compensation and fluid path optimization design, significantly improve heat exchange efficiency, prolong the life of equipment, reduce maintenance cost, with wide application prospect.

The invention relates to the technical field of bearing mechanical devices, in particular to a precise main shaft bearing pre-tightening force self-adaptive adjusting method based on thermal error decoupling. Comprising the steps that in a bearing assembly of a tapered roller bearing, thermal displacement errors and actual pre-tightening force of a main shaft are collected, a dynamic stiffness threshold value and a contact uniformity threshold value are calculated according to working condition loads, the rotating speed of the main shaft and the environment temperature, and roller friction heat flow is collected; calculating a mechanical displacement effect and a friction heat effect, calculating an axial thermal elongation component by using a roller friction heat flow, separating the component from a thermal displacement error, and generating a decoupling result; calculating the dynamic rigidity and the load uniformity through a bearing heat engine coupling model, verifying whether the pre-tightening force meets requirements or not, and if not, adjusting the pre-tightening force to a boundary point of a feasible region and recalculating the pre-tightening force adjustment amount; and pre-tightening force adjustment amount is applied to the outer ring of the tapered roller bearing. According to the invention, through thermal error decoupling, fine pre-tightening force self-adaptive adjustment is realized.

The invention discloses a numerical control machine tool thermal error online compensation control method and system, and belongs to the technical field of numerical control machine tool precision machining.The method comprises the steps that temperature data and operation parameters of key parts of a machine tool are collected, and temperature feature vectors are generated; constructing a temperature field adjacent matrix, and predicting future temperature field distribution; establishing nonlinear mapping of the temperature field and thermal deformation by adopting a graph neural network, and outputting a thermal displacement predicted value; superposing the compensation instruction to the original track for execution; according to the method, the spatial correlation characteristics of the temperature field are captured by adopting graph convolution operation, the thermal error prediction precision is superior to 2 microns, and the compensation rate reaches 85% or above.

The invention provides a piston type through-wall pipe heat preservation structure and a construction method thereof.The heat preservation structure comprises a sleeve arranged on the outer side of a through-wall pipe in a sleeving mode, one end of the sleeve is arranged on a furnace wall, the through-wall pipe can move relative to the sleeve in the axial direction, and a first heat preservation layer is arranged on the outer side of the through-wall pipe; the outer wall of the first heat preservation layer is in close sliding fit with the inner wall of the sleeve, and a second heat preservation layer is arranged outside the sleeve. The device further comprises a positioning assembly which is used for locking and fixing the first heat preservation layer to the through-wall pipe, so that the first heat preservation layer and the through-wall pipe keep moving synchronously. According to the invention, the inner-layer thermal insulation structure is used as a piston which slides in the sleeve and is adaptive to large-stroke thermal displacement of the through-wall pipe, and meanwhile, the positioning assembly is used for preventing the thermal insulation layer from slipping, so that the problems that a traditional thermal insulation structure is easy to damage and poor in sealing property and a thermal insulation material is easy to fall off are solved, and the safety specification that a pressure pipeline is free of welding is met.

The application discloses a kind of multimodal AI real-time thermal error compensation robot component processing method and system.The method is by collecting temperature, working condition and thermal displacement and other multimodal data, establish the nonlinear, time-varying mapping relationship between temperature, working condition and thermal displacement, realize the accurate prediction of future thermal displacement.Based on the prediction data, the system calculates the reverse compensation amount in real time, and issues to the robot control system to offset thermal error.For the case of insufficient or excessive compensation, secondary compensation and reverse compensation process are introduced, and the prediction period is dynamically adjusted by combining the time correction coefficient, forming a closed-loop intelligent control.The application effectively overcomes the hysteresis and singleness of traditional compensation method, significantly improves the precision, stability and self-adaptive ability of robot precision component processing.

The application discloses a high-speed low-vibration magnetic suspension power generation system and belongs to the technical field of power generation. The system is mainly composed of a rack, a generator, an external driving device, an elastic coupling, a bearing control mechanism and a cooling pipeline assembly. A multi-source sensing array is adopted, and feedforward control is used to realize bidirectional active vibration suppression of the system and the external environment. The elastic coupling is used to decouple the dynamic characteristics of the external driving device and the generator rotor. The cooling pipeline is matched with a rigid support body and a spherical compensator to synchronously realize vibration transmission interruption and pipeline thermal displacement compensation. The application solves the pain points of the existing magnetic suspension power generation system, such as weak integration adaptability, inability to cooperatively suppress internal and external vibrations, pipeline vibration and thermal displacement affecting operation reliability, and has high overall integration and power density, excellent vibration reduction effect in the full frequency band, and is suitable for high-speed large-capacity low-vibration application scenarios such as ships and precision manufacturing.

Temperature estimation method for a machine tool to estimate, in a machine tool which has a plurality of sections to which temperature sensors (S) are attached, and one section to which the temperature sensor (S) is not attached, a temperature of the section where the temperature sensor (S) is not attached, wherein the temperature estimation method includes: a temperature information acquisition step of obtaining temperature information from the temperature sensors (S) at two or more different sections where the temperature sensors (S) are attached; an operational information acquisition step of obtaining a predetermined operational information, which is represented by two types of states that are ON and OFF; a coefficient determination step of determining a coefficient for each part of the temperature information, such that if a time at which the operating information is switched from ON to OFF or from OFF to ON is a reference time, the coefficient for each part of the temperature information is changed according to a time that elapses from the reference time; and a temperature estimation step of estimating a temperature of the section where the temperature sensor (S) is not attached, based on the temperature information and the coefficient for the temperature information.

The application relates to the technical field of bearing mechanical devices, in particular to a precision spindle bearing pre-tightening force self-adaptive adjusting method based on thermal error decoupling. The method comprises the following steps: collecting thermal displacement errors and actual pre-tightening forces of a spindle in a bearing assembly of a tapered roller bearing; according to working conditions, a spindle rotating speed and an environment temperature, dynamic stiffness threshold values and contact uniformity threshold values are calculated; roller friction heat flow is collected; mechanical displacement effects and friction heat effects are calculated, and an axial thermal elongation component is calculated by using the roller friction heat flow; the above components are separated from the thermal displacement errors to generate decoupling results; dynamic stiffness and load uniformity are calculated through a bearing thermal-mechanical coupling model, and whether the pre-tightening force meets the requirements is verified; if the pre-tightening force does not meet the requirements, the pre-tightening force is adjusted to a boundary point in a feasible region, and the pre-tightening force adjustment amount is recalculated; and the pre-tightening force adjustment amount is applied to an outer ring of the tapered roller bearing. The pre-tightening force is self-adaptively adjusted through thermal error decoupling.

The invention relates to the technical field of finite element simulation testing, in particular to a support hanger vibration stress state analysis method based on finite element analysis, which comprises the following steps: step 1, creating a three-dimensional model of a steam-water pipeline system comprising a support hanger; 2, finite element software is imported, a spring unit, thermal displacement boundary conditions and connection rigidity are finely defined, and a high-fidelity finite element model is established; 3, statics analysis and modal analysis are carried out, and stress, strain, inherent frequency and vibration mode under the action of gravitational acceleration, pipeline internal pressure, pipeline operation temperature and pipeline displacement load are obtained; and 4, based on the material strength and the vibration test frequency, judging the model precision and reliability, and if not, optimizing the model parameters. According to the method, boundary conditions and model parameters are finely defined, and verification and correction are performed by using experimental data, so that the simulation precision of the model is remarkably improved, and the model can be reliably used for identifying and analyzing the load of the support hanger.

The utility model relates to the technical field of natural gas engineering, and particularly discloses an anti-seismic support for a natural gas long-distance pipeline branch transportation station yard. The two damping buffers are mounted at the two ends respectively. The support comprises a first bearing part and a second bearing part, the second bearing part is pre-buried in an installation position, and the two damping buffers are connected with the first bearing part and the second bearing part respectively. A pipeline mounting part is arranged on one side of the first bearing part and fixedly connected with the first bearing part. The damping buffer is installed on the bearing part through a universal hinged support. And the second bearing part is fixed on the structure. Under normal working conditions, thermal displacement of the pipeline is not limited by the support. When an earthquake occurs, the support limits vibration of the pipeline and prevents resonance damage. The bracket improves the stability and the reliability of the pipeline, disperses earthquake force through the double damping buffers, allows multi-directional displacement through the universal hinged supports, is convenient to maintain, and ensures the safety and the stability of a natural gas conveying system.

The invention relates to the technical field of high-temperature heat storage, in particular to a foundation structure for supporting a fused salt storage tank. The device comprises a sandy soil cushion layer and a fine sand layer which are coaxial and have the same diameter, a ring beam wrapping the periphery of the sandy soil cushion layer, and a plurality of steel plate assemblies wrapping the periphery of the fine sand layer, wherein the sandy soil cushion layer and the fine sand layer are stacked from bottom to top; the multiple steel plate assemblies are arrayed at equal intervals in the circumferential direction of the axis of the fine sand layer and fixedly inserted into the top of the ring beam. A bottom plate is installed at the bottom of the fused salt storage tank, and a plurality of steel plate strips are installed at the bottom of the bottom plate and arrayed at equal intervals in the circumferential direction of the axis of the bottom plate. The fused salt storage tank is located on the tops of the fine sand layer and the multiple steel plate assemblies through the bottom plate, and each steel plate strip is located between every two adjacent steel plate assemblies. By arranging the multiple steel plate assemblies, the steel plate assemblies can restrain and limit the circumferential thermal displacement of the steel plate strips, and the thermal displacement between the fused salt storage tank and the foundation structure is reduced.

The utility model discloses a friction pair structure of a large-pipe-diameter steam pipeline sliding support, relates to the technical field of nuclear power station heat distribution pipeline supports and is used for solving the problem that normal sliding of the support is affected due to the fact that a polyfluortetraethylene plate of an original sliding support which is large in basic load, displacement load and axial and radial thermal displacement is distorted and protruded and deformed. The sliding support friction pair comprises a sliding pair upper mirror surface stainless steel plate and a friction pair lower mirror surface stainless steel plate. The sliding pair upper mirror surface stainless steel plate is located below the sliding support tube base upper steel plate, and the sliding pair upper mirror surface stainless steel plate and the tube base upper steel plate are attached and connected in a spot welding mode. The friction pair lower mirror surface stainless steel plate is located below the sliding pair upper mirror surface stainless steel plate, and the friction pair lower mirror surface stainless steel plate and the sliding pair upper mirror surface stainless steel plate slide The sliding support tube seat lower steel plate is located below the friction pair lower mirror surface stainless steel plate and is attached to and connected with the friction pair lower mirror surface stainless steel plate through spot welding; and the concrete buttress embedded steel plate is positioned below the pipe seat lower steel plate.

To provide a method for accurately estimating an elevated temperature value at a place where heat is generated, in accordance with a state of the place where heat is generated, in a machine tool equipped with a cooling device, a method for estimating a thermal displacement amount at the place where heat is generated, a method for controlling the cooling device for cooling the place where heat is generated, and a machine tool that can execute the method for estimating the elevated temperature value.SOLUTION: A machine tool, which is equipped with a spindle cooling device 7, comprises temperatures sensors 13 and 14 which can measure a temperature of the machine tool and a temperature of a spindle 3, which determines an operation state of the spindle cooling device 7 and determines whether a time measured based on the fact that the spindle cooling device 7 is operated or stopped passes over a preset delay time or not, so as to determine a cooling state of the spindle 3, selects a suitable estimation model corresponding to the cooling state of the spindle 3 out of a plurality of estimation models A-D corresponding to different cooling states of the spindle 3, and calculates an estimated elevated-temperature value of the spindle 3 on the basis of the estimation mode and temperature data derived from measurement values obtained by the temperature sensors 13 and 14.SELECTED DRAWING: Figure 1