CN120609476A - Pressure measurement device and calibration system for large-size and large-tonnage flexible flat actuators - Google Patents
Pressure measurement device and calibration system for large-size and large-tonnage flexible flat actuatorsInfo
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- CN120609476A CN120609476A CN202511096778.1A CN202511096778A CN120609476A CN 120609476 A CN120609476 A CN 120609476A CN 202511096778 A CN202511096778 A CN 202511096778A CN 120609476 A CN120609476 A CN 120609476A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/62—Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
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Abstract
本发明公开一种大尺寸大吨位柔性扁平作动器的压力测量装置及标定系统，该装置包括监测单元、分载单元和保持器；监测单元呈阵列分布、用于承压并监测压力，其包括多筒组件、圆封头一和LVDT位移传感器，多筒组件为多个同心间隔套在一起且两端对齐的圆筒一，LVDT位移传感器用于测量圆封头一的轴向移动距离并反算出所在监测单元承受的加载力；分载单元直径小于监测单元、呈阵列分布在监测单元阵列的间隙之间、与监测单元等高、用于分担载荷以使载荷均匀，其包括圆筒二和圆封头二；保持器用于保持各监测单元和分载单元的位置。该装置能在有限空间内部署并满足标定量程要求，可满足五万吨级柔性作动器的标定。
The present invention discloses a pressure measurement device and calibration system for a large-sized, large-tonnage flexible flat actuator. The device includes a monitoring unit, a load-sharing unit, and a retainer. The monitoring unit is distributed in an array and is used to bear and monitor pressure. It includes a multi-cylinder assembly, a circular head, and an LVDT displacement sensor. The multi-cylinder assembly is a plurality of concentrically spaced cylinders nested together with their ends aligned. The LVDT displacement sensor is used to measure the axial movement distance of the circular head and inversely calculate the loading force borne by the monitoring unit. The load-sharing unit has a diameter smaller than the monitoring unit, is distributed in an array between the gaps in the monitoring unit array, and is at the same height as the monitoring unit. It is used to share the load to ensure uniformity. It includes a second cylinder and a second circular head. The retainer is used to maintain the position of each monitoring unit and load-sharing unit. The device can be deployed in a limited space and meet the calibration range requirements, and can meet the calibration requirements of 50,000-ton flexible actuators.
Description
Technical Field
The invention relates to a deep geotechnical engineering test, in particular to a pressure measuring device and a calibration system of a large-size large-tonnage flexible flat actuator.
Background
When the deep geotechnical engineering test is carried out, the actuator is required to carry out large-tonnage loading on a large-size test piece in a narrow space so as to fully simulate the deep geotechnical environment, and in order to meet the use requirement of the narrow space and the loading requirement of the large-size test piece on the large-tonnage, the large-size large-tonnage flexible flat actuator is required to be adopted, the loading contact surface of the actuator can reach the range of 2m multiplied by 2m, the thickness is within half meter, the design limiting pressure can reach 130Mpa, and the loading force can reach 5 ten thousands 2 kilotons.
In order to enable the large-size large-tonnage flexible flat actuator to work accurately and reliably, the loading performance of the large-size large-tonnage flexible flat actuator needs to be calibrated, the pressure distribution condition and the change condition of a calibration surface need to be monitored in real time in the calibration process, but the current pressure measurement generally adopts a strain gauge type tension pressure sensor, the maximum measuring range of a single sensor is about 300t, more than one hundred seventy percent is needed to meet the requirement of the calibration measuring range, the arrangement space on a calibration rack is insufficient, so many sensors cannot be arranged, if the sensors with larger measuring range are needed, the single sensor is quite huge in volume due to the working characteristic of a resistance strain gauge, and the arrangement space is also insufficient.
Disclosure of Invention
The invention aims to provide a pressure measuring device of a large-size large-tonnage flexible flat actuator and a calibration system of the large-size large-tonnage flexible flat actuator, which comprise the device, wherein the device can be deployed in a limited space and can meet the requirement of a calibration range, and can meet the calibration of a five-hundred thousand-ton flexible actuator.
The technical scheme adopted by the invention is as follows:
A pressure measuring device of a large-size large-tonnage flexible flat actuator comprises a monitoring unit, a load sharing unit and a retainer; the monitoring units are distributed in an array and used for bearing pressure and monitoring pressure, the monitoring units comprise a multi-cylinder assembly, a round head I and an LVDT displacement sensor, the multi-cylinder assembly is a plurality of cylinders I which are concentrically sleeved together at intervals and have aligned two ends, hollow structures used for guiding axial elastic compression are regularly distributed on each cylinder I, the two ends of the multi-cylinder assembly are respectively provided with a compression end and a support end, the round head I is covered and placed at the compression end of the multi-cylinder assembly and radially limits each cylinder I, and the LVDT displacement sensor is used for measuring the axial movement distance of the round head I and back calculating the loading force born by the monitoring unit; the diameter of the load dividing unit is smaller than that of the monitoring unit, the load dividing unit is distributed among gaps of the monitoring unit array in an array mode, the load dividing unit is equal to the monitoring unit in height and used for sharing load to enable the load to be uniform, the load dividing unit comprises a cylinder II and a round seal head II, hollow structures used for guiding axial elastic compression are regularly distributed on the cylinder II, a compression end and a supporting end are respectively arranged at two ends of the cylinder II, the round seal head II is placed at the compression end of the cylinder II in a covering mode and used for limiting the cylinder II in the radial mode, a retainer is used for keeping the positions of the monitoring units and the load dividing units and is in a flat plate shape, through holes used for accommodating the monitoring units and the load dividing units and used for limiting the load dividing units in the radial mode are distributed on the retainer, and the round seal head I and the round seal head II expose the through holes and have axial movable space when pressed.
Preferably, in the first cylinder and the second cylinder, the hollow structure is a plurality of wire holes arranged along the circumferential direction, the wire holes on the same layer are uniformly distributed around the axis, the wire holes on the adjacent layers are staggered, and the two ends of the wire holes are circular arc-shaped flaring.
Preferably, the barrel bodies of the first barrel and the second barrel are provided with notches at the pressure end, the notches are two in one group, the two notches in the same group are adjacent to each other and form a protrusion between the two notches, and the protrusion corresponds to the length midpoint of the adjacent line hole in the axial direction.
Preferably, in the first cylinder and the second cylinder, the two cylinders are made of the same material, and the axial compression deformation capacity of the first cylinder and the second cylinder is adjusted by adjusting the wall thickness and the hollow structure, and simulation experiments are adopted to verify that the monitoring unit and the load sharing unit can integrally and coordinately deform.
Preferably, the first cylinder and the second cylinder are made of high-strength elastic alloy materials, the elastic modulus is more than 200GPa, and the yield strength is 800-1200 MPa.
Preferably, the pressed front surface of the round seal head I is provided with a plurality of concentric round ring grooves.
Preferably, the pressed back of the first round seal head is provided with a first convex disc and a plurality of convex rings, the first convex disc is positioned at the center of a circle and is used for being inserted into the first cylinder of the innermost layer in a matched mode to achieve radial limiting, the convex rings are concentrically distributed about the center of the circle and are used for being inserted into the first cylinder of the other cylinders in a matched mode to achieve radial limiting, the pressed back of the second round seal head is provided with a second convex disc, and the second convex disc is positioned at the center of the circle and is used for being inserted into the second cylinder in a matched mode to achieve radial limiting.
Preferably, the tail end of the LVDT displacement sensor is arranged on a bracket, the bracket is provided with a plurality of connectors, the first supporting end of the innermost cylinder is distributed with mounting grooves corresponding to the connectors, and when the connectors are arranged on the mounting grooves in a matching way, the LVDT displacement sensor is positioned at the axle center and the measuring end is propped against the center of the first round seal head.
Preferably, in the retainer, the through hole corresponding to the monitoring unit is a stepped hole, one end of the through hole is matched with the diameter of the first cylinder of the outermost layer, the other end of the through hole is matched with the diameter of the first round seal head, the through hole corresponding to the load sharing unit is a stepped hole, one end of the through hole is matched with the diameter of the second cylinder, the other end of the through hole is matched with the diameter of the second round seal head, and the pressed back surfaces of the first round seal head and the second round seal head are at a certain distance from the inner end surfaces of the through holes.
Preferably, one surface of the retainer, which is far away from the first round end socket and the second round end socket, is provided with a plurality of wiring grooves, each of which can extend from the edge of the retainer to all through holes, and the wiring grooves are used for wiring of the LVDT displacement sensor.
Preferably, the retainer is made of die steel.
The utility model provides a calibration system of large-size large-tonnage flexible flat actuator, including demarcating rack, cushion and above-mentioned pressure measurement device, demarcating rack has cylindrical cavity, the cushion is located the cavity and laminating in the both sides of cavity, form the installation space between the cushion of both sides, large-size large-tonnage flexible flat actuator is located the installation space and is in the cavity center, pressure measurement device is located the installation space and is in one side or both sides of large-size large-tonnage flexible flat actuator, pressure measurement device's one side is direct or through backing plate and the contact of large-size large-tonnage flexible flat actuator, the another side provides the counter-force by the cushion.
The beneficial effects of the invention are as follows:
The monitoring unit adopts a plurality of cylinders with hollow structures to be sleeved together at a same time, the respective elastic compression is not affected, the measuring range of a single monitoring unit can be greatly increased in a limited space under the condition that the outer diameter and the wall thickness are not increased, the calibration range requirement can be met by deploying and calibrating the flexible actuator in a limited space, the calibration of the flexible actuator in the class of fifty thousand tons can be met, the integral loading force and the loading force distribution of the large-size flexible flat actuator can be obtained by integrating the loading force measured by each monitoring unit, the calibration of the loading performance of the actuator can be realized, the monitoring unit adopts the plurality of cylinders to be sleeved together at a same time, the number and the wall thickness of the first cylinders can be determined according to the requirement, the processing difficulty is low, the material waste is small, the first cylinder head can ensure the relative position of the first cylinders, the first cylinders can be synchronously compressed, the multi-cylinder assembly can bear the load uniformly, the split load unit can be compressed axially, the load can be distributed as uniformly as possible under the load, the load is prevented from being concentrated at the position of the monitoring unit, the measurement deviation is caused, the load can be kept, the positions of the monitoring unit and the split load units can be kept, the position of the split load units can be prevented from being damaged, the load units can be independently, the displacement units can be prevented from being mounted in the through holes, and the displacement of the monitoring units can be conveniently replaced, and the displacement of the respective through-load units can be conveniently and maintained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a pressure measurement device of a large-scale, large-tonnage flexible flat actuator according to the present invention.
FIG. 2 is a perspective view of a pressure measurement device of a large-scale, large-tonnage flexible flat actuator according to the present invention.
Fig. 3 is a perspective view of a monitoring unit according to the present invention.
Fig. 4 is a second perspective view of the monitoring unit of the present invention.
Fig. 5 is a disassembled view of the monitoring unit of the present invention.
Fig. 6 is a perspective view of the split load unit in the present invention.
Fig. 7 is a disassembled view of the split load unit in the present invention.
Fig. 8 is a perspective view of the holder in the present invention.
FIG. 9 is an elevation view of a calibration system for a large-scale, large-tonnage flexible flat actuator according to the present invention.
FIG. 10 is a perspective view of a calibration system for a large-scale, large-tonnage flexible flat actuator according to the present invention.
In the figure:
1-a monitoring unit, 11-a round seal head I, 111-a round ring groove, 112-a convex disc I, 113-a convex ring, 12-a cylinder I, 121-a line hole, 1211-a flaring, 122-a notch, 123-a mounting groove, 13-LVDT displacement sensor and 14-a bracket;
2-load dividing units, 21-round sealing heads II, 211-convex discs II, 22-cylinders II, 221-line holes, 2211-flaring and 222-notch;
3-retainer, 31-through hole I, 32-through hole II, 33-wiring groove;
100-pressure measuring device, 200-calibration rack, 300-cushion block, 400-backing plate and 500-large-size large-tonnage flexible flat actuator.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "round head one", "round head two", "cylinder one", "cylinder two", "cam one", "cam two", "through hole one", "through hole two", and the like are used solely for distinguishing descriptions and are not to be construed as indicating or implying relative importance.
The features and capabilities of the present application are described in further detail below in connection with the examples.
Example 1
The embodiment discloses a pressure measuring device of a large-size large-tonnage flexible flat actuator, which is shown in fig. 1 and2, and comprises a monitoring unit 1, a load sharing unit 2 and a retainer 3, wherein:
The monitoring units 1 are distributed in an array and used for bearing pressure and monitoring pressure, the monitoring units comprise a multi-cylinder assembly, a round head I11 and an LVDT displacement sensor 13, the multi-cylinder assembly is a plurality of cylinders I12 which are concentrically sleeved together at intervals and are aligned at two ends, hollow structures used for guiding axial elastic compression are regularly distributed on each cylinder I12, two ends of the multi-cylinder assembly are respectively provided with a compression end and a supporting end, the round head I11 is covered and placed at the compression end of the multi-cylinder assembly and radially limits each cylinder I12, the LVDT displacement sensor 13 is used for measuring the axial movement distance of the round head I11 and calculating the loading force born by the monitoring unit in a back-calculation mode, and the monitoring units are shown in figures 1 to 5;
The diameter of the load dividing unit 2 is smaller than that of the monitoring unit 1, the load dividing unit is distributed among gaps of the array of the monitoring unit 1 in an array manner, the load dividing unit is as high as the monitoring unit 1 and is used for sharing load so as to make the load uniform, the load dividing unit comprises a cylinder II 22 and a round seal head II 21, hollow structures for guiding axial elastic compression are regularly distributed on the cylinder II 22, two ends of the cylinder II 22 are respectively a compression end and a support end, the round seal head II 21 is covered and placed at the compression end of the cylinder II 22 and radially limits the cylinder II 22, and the load dividing unit is shown in fig. 1,2, 6 and 7;
The retainer 3 is used for retaining the positions of the monitoring units 1 and the load-dividing units 2, and is in a flat plate shape, through holes 31 for accommodating the monitoring units 1 and performing radial limiting, through holes 32 for accommodating the load-dividing units 2 and performing radial limiting are distributed on the retainer 1, the round seal heads 11 expose the through holes 31 and have axial movable spaces when pressed, and the round seal heads 21 expose the through holes 32 and have axial movable spaces when pressed, as shown in fig. 1,2 and 8.
According to the scheme, the method comprises the following steps:
The monitoring units 1 are sleeved together by adopting a plurality of cylinders with hollow structures and 12 concentric intervals, so that the respective elastic compression is not affected, the range of a single monitoring unit 1 can be greatly increased in a limited space under the condition that the outer diameter and the wall thickness are not increased, the calibration range requirement can be met by deployment in the limited space, the calibration of a five-ten-thousand-ton flexible actuator can be met, the loading force of each monitoring unit is comprehensively measured 1, the integral loading force and the loading force distribution of a large-size large-tonnage flexible flat actuator can be obtained, and the calibration of the loading performance of the actuator is realized;
The monitoring unit 1 adopts a plurality of cylinders I12 to be sleeved together at intervals concentrically, the number and the wall thickness of the cylinders I12 can be determined according to the requirement, the processing difficulty is low, the material waste is less, the circular seal heads I11 ensure the relative positions of the cylinders I12, and the cylinders I12 can be synchronously compressed, so that the multi-cylinder assembly can bear load uniformly;
the load sharing unit 2 can share load and can also axially compress under the load, so that the load can be distributed as uniformly as possible, and measurement deviation caused by the fact that the load is concentrated at the position of the monitoring unit 1 is avoided;
the retainer 3 can keep the positions of each monitoring unit 1 and each load sharing unit 2, so that the unit displacement in the loading process can be avoided, the rigid limit can be carried out at the end section of the loading process, and the LVDT displacement sensor 13 is prevented from being damaged;
each monitoring unit 1 and each load sharing unit 3 are arranged in the corresponding through hole and are mutually independent, so that the maintenance and the replacement are convenient;
The LVDT displacement sensor 13 is adopted to collect data, and the characteristics of high precision, reliability, high repeatability, low temperature drift and the like are achieved.
Regarding the specific structure of the monitoring unit 1, in the present embodiment:
As shown in fig. 3 to 5, preferably, in each cylinder one 12, the hollowed structure is a plurality of wire holes 121 arranged along the circumferential direction, the wire holes 121 on the same layer are uniformly distributed around the axis, the wire holes 121 on the adjacent layers are staggered with each other, the two ends of the wire holes 121 are arc-shaped flares 1211, the multi-layer staggered circumferences Xiang Xiankong 121 can guide the axial compression, the arc-shaped flares 1211 are used for avoiding the stress concentration, the axial compression can be prevented from developing towards the circumferential fission, and the stable compression is maintained.
As shown in fig. 3 and 5, preferably, on the barrel body of the first barrel 12, the pressure-bearing end of the barrel body is provided with notches 122, two notches 122 in one group are adjacent to each other, a protrusion is formed between the two notches 122 in the same group, the protrusion corresponds to the midpoint of the length of the adjacent wire hole 121 in the axial direction, and the notch 122 can guide the force to be transmitted downwards to the midpoint of the length of the wire hole 121 so as to facilitate the first compression and the subsequent compression.
As shown in fig. 3 and 5, preferably, the tail end of the LVDT displacement sensor 13 is mounted on a support 14, the support 14 is provided with a plurality of connectors, the support end of the innermost cylinder one 12 is distributed with mounting grooves 123 corresponding to the connectors, when the connectors are mounted on the mounting grooves 123 in a matching way, the LVDT displacement sensor 13 is positioned at the axle center and the measuring end is abutted against the center of the round head one 11, and the support 14 and the innermost cylinder one 12 are mounted in a multi-point positioning way in which the connectors are matched with the mounting grooves 123, so that the LVDT displacement sensor 13 is positioned at the axle center, and the axial movement of the round head one 11 is measured most accurately.
As shown in FIG. 4, preferably, the pressed front surface of the first round seal head 11 is provided with a plurality of concentric circular grooves 111, the pressed front surface of the first round seal head 11 is larger, the surface is deformed during loading, and the circular grooves 111 can accommodate materials generated by surface deformation on one hand, ensure good contact of contact surfaces and can avoid the phenomenon of photoresist on the other hand.
As shown in fig. 5, preferably, the pressed back surface of the round seal head 11 is provided with a convex disc 112 and a plurality of convex rings 113, the convex disc 112 is located at the center of a circle and is used for being inserted into the innermost cylinder 12 to realize radial limit, and the convex rings 113 are concentrically distributed about the center of the circle and are used for being inserted into other cylinders 12 to realize radial limit.
Regarding the specific structure of the split load unit 2, in the present embodiment:
As shown in fig. 6 and 7, in the second cylinder 22, preferably, the hollow structure is a plurality of wire holes 221 circumferentially arranged, the wire holes 221 on the same layer are uniformly distributed around the axis, the wire holes 221 on adjacent layers are mutually staggered, and two ends of the wire holes 221 are circular arc-shaped flaring 2211. The multi-layered staggered perimeter Xiang Xiankong 221 can guide axial compression, and the circular arc-shaped flared mouth 2211 is used for avoiding stress concentration, can avoid the development of axial compression to circumferential fission, and keeps stable compression.
As shown in fig. 6 and 7, preferably, on the barrel body of the second barrel 22, the pressure-receiving end of the barrel body is provided with notches 222, two notches 222 in one group are adjacent to each other, a protrusion is formed between the two notches 222 in the same group, the protrusion corresponds to the midpoint of the length of the adjacent wire hole 221 in the axial direction, and the notch 222 can guide the force to be transmitted downwards to the midpoint of the length of the wire hole 221 so as to facilitate the first compression and the subsequent compression.
As shown in fig. 7, preferably, a second convex disc 211 is disposed on the pressed back of the second round seal head 21, and the second convex disc 211 is located at the center of the circle and is used for being inserted into the second round seal head 21 in a matching manner to achieve radial limiting.
Regarding the cooperation of the monitoring unit 1 and the load sharing unit 2, in the present embodiment:
In the first cylinder 12 and the second cylinder 22, the same material is adopted, and the axial compression deformation capacity is adjusted by adjusting the wall thickness and the hollow structure (the size, the number and the position of the wire holes) and verified by adopting simulation experiments, so that the monitoring unit 1 and the load sharing unit 2 can integrally and coordinately deform. The first cylinder 12 and the second cylinder 22 can be made of high-strength elastic alloy materials, and can meet the requirements of the elastic modulus of >200Gpa and the yield strength of 800-1200 MPa, such as elastic alloy 3J33.
Regarding the arrangement of the monitoring unit 1 and the load sharing unit 2, in the present embodiment:
The sizes and the distribution of the monitoring units 1 and the split carrying units 2 are designed according to the loading contact surface range of the large-size large-tonnage flexible flat actuator, taking the loading contact surface range of 2m multiplied by 2m as an example, in the monitoring units 1, the diameter of a round seal head I11 is 400mm, the diameter of an outermost cylinder I12 is slightly smaller than that of the cylinder I11, the monitoring units 1 are arranged in a5 multiplied by 5 array, the distance between the adjacent monitoring units 1 is as close as possible, in the split carrying units 2, the split carrying units 2 are arranged in a 4 multiplied by 4 array, the diameter of a round seal head II 21 is 200mm, the diameter of a cylinder II 22 is slightly smaller than that of the cylinder II 21, and the split carrying units 2 are positioned in the center of an array gap of the monitoring units 1.
Regarding the holder 3, in the present embodiment:
As shown in fig. 8, preferably, the first through hole 31 is a stepped hole, one end of the first through hole is matched with the diameter of the first outer cylinder 12, the other end of the first through hole is matched with the diameter of the first round seal head 11, the pressed back surface of the first round seal head 11 is a certain distance from the inner end surface of the first through hole 31, the second through hole 32 is a stepped hole, one end of the second through hole is matched with the diameter of the second cylinder 22, the other end of the second through hole is matched with the diameter of the second round seal head 21, and the pressed back surface of the second round seal head 21 is a certain distance from the inner end surface of the second through hole 32.
As shown in fig. 8, preferably, a surface of the retainer 3 away from the first round head 11 and the second round head 21 is provided with a plurality of wiring grooves 33, each wiring groove 33 being capable of extending from the edge of the retainer to all of the first through holes 31 and all of the second through holes 32, the wiring grooves being used for wiring of the LVDT displacement sensor 13.
Preferably, the retainer 3 is made of die steel, and has the characteristics of high toughness, small residual stress and the like, such as DC53.
Example two
The embodiment discloses a calibration system of a large-size large-tonnage flexible flat actuator, as shown in fig. 9 and 10, comprising a calibration bench 200, a cushion block 300 and the pressure measuring device 100, wherein the calibration bench 200 is provided with a cylindrical cavity, the cushion block 300 is positioned in the cavity and is attached to two sides of the cavity, an installation space is formed between the cushion blocks 300 on two sides, the large-size large-tonnage flexible flat actuator 500 is positioned in the installation space and is positioned in the center of the cavity, the pressure measuring device 100 is positioned in the installation space and is positioned on one side of the large-size large-tonnage flexible flat actuator 500, one side of the pressure measuring device 100 is contacted with the large-size large-tonnage flexible flat actuator 500 through a cushion plate 400, and the other side is provided with counter force by the cushion block 300. Of course, the pressure measuring device 100 may be selectively disposed on one or both sides of the actuator 500, directly or through the pad 400 contacting the actuator 500, and the LVDT displacement sensor 13 may be selectively disposed at all or part or only of the central monitoring unit 1 according to specific requirements.
The embodiments described above are some, but not all embodiments of the application. The detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (12)
1. The pressure measuring device of the large-size large-tonnage flexible flat actuator is characterized by comprising a monitoring unit, a load sharing unit and a retainer; the monitoring units are distributed in an array and used for bearing pressure and monitoring pressure, the monitoring units comprise a multi-cylinder assembly, a round head I and an LVDT displacement sensor, the multi-cylinder assembly is a plurality of cylinders I which are concentrically sleeved together at intervals and have aligned two ends, hollow structures used for guiding axial elastic compression are regularly distributed on each cylinder I, the two ends of the multi-cylinder assembly are respectively provided with a compression end and a support end, the round head I is covered and placed at the compression end of the multi-cylinder assembly and radially limits each cylinder I, and the LVDT displacement sensor is used for measuring the axial movement distance of the round head I and back calculating the loading force born by the monitoring unit; the diameter of the load dividing unit is smaller than that of the monitoring unit, the load dividing unit is distributed among gaps of the monitoring unit array in an array mode, the load dividing unit is equal to the monitoring unit in height and used for sharing load to enable the load to be uniform, the load dividing unit comprises a cylinder II and a round seal head II, hollow structures used for guiding axial elastic compression are regularly distributed on the cylinder II, a compression end and a supporting end are respectively arranged at two ends of the cylinder II, the round seal head II is placed at the compression end of the cylinder II in a covering mode and used for limiting the cylinder II in the radial mode, a retainer is used for keeping the positions of the monitoring units and the load dividing units and is in a flat plate shape, through holes used for accommodating the monitoring units and the load dividing units and used for limiting the load dividing units in the radial mode are distributed on the retainer, and the round seal head I and the round seal head II expose the through holes and have axial movable space when pressed.
2. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein in the first cylinder and the second cylinder, the hollow structure is a plurality of wire holes arranged along the circumferential direction, wire holes on the same layer are uniformly distributed around the axis, wire holes on adjacent layers are staggered, and two ends of each wire hole are arc-shaped flaring.
3. The pressure measuring device of the large-size large-tonnage flexible flat actuator according to claim 2, wherein notches are arranged at the pressure-bearing ends of the first cylinder and the second cylinder, the notches are one group by one, two notches in the same group are adjacent to each other, a protrusion is formed between the two notches, and the protrusion corresponds to the midpoint of the length of the adjacent line hole in the axial direction.
4. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein the first cylinder and the second cylinder are made of the same material, and the axial compression deformation capacity of the first cylinder and the second cylinder is adjusted by adjusting the wall thickness and the hollow structure, and the pressure measuring device is verified by adopting a simulation experiment, so that the monitoring unit and the load sharing unit can integrally and coordinately deform.
5. The pressure measuring device of the large-size large-tonnage flexible flat actuator according to claim 1 or 4, wherein the first cylinder and the second cylinder are made of high-strength elastic alloy materials, the elastic modulus is more than 200GPa, and the yield strength is 800-1200 MPa.
6. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein the pressed front surface of the round head I is provided with a plurality of concentric circular grooves.
7. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein a first convex disk and a plurality of convex rings are arranged on the pressed back surface of the first round seal head, the first convex disk is positioned at the center of a circle and is used for being matched and inserted into the first cylinder at the innermost layer to realize radial limit, the convex rings are concentrically distributed about the center of the circle and are used for being matched and inserted into the first cylinder to realize radial limit, the second convex disk is arranged on the pressed back surface of the second round seal head, and the second convex disk is positioned at the center of the circle and is used for being matched and inserted into the second cylinder to realize radial limit.
8. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein the tail end of the LVDT displacement sensor is arranged on a bracket, the bracket is provided with a plurality of connectors, a supporting end of an innermost cylinder is provided with mounting grooves corresponding to the connectors, the LVDT displacement sensor is positioned at the axle center and the measuring end is propped against the center of a circle of a round head when the connectors are matched and arranged on the mounting grooves.
9. The pressure measuring device of the large-size large-tonnage flexible flat actuator according to claim 1, wherein in the retainer, the through holes corresponding to the monitoring units are stepped holes, one ends of the through holes are matched with the first diameter of the outermost cylinder, the other ends of the through holes are matched with the first diameter of the round head, the through holes corresponding to the split-load units are stepped holes, one ends of the through holes are matched with the second diameter of the cylinder, the other ends of the through holes are matched with the second diameter of the round head, and the pressed back surfaces of the first round head and the second round head are at a certain distance from the inner end surfaces of the through holes.
10. The pressure measuring device of the large-size large-tonnage flexible flat actuator of claim 1, wherein a plurality of wiring grooves are arranged on one surface of the retainer, which is far away from the round head I and the round head II, and each wiring groove can extend from the edge of the retainer to all through holes, and the wiring grooves are used for wiring of the LVDT displacement sensor.
11. The pressure measuring device of a large-size large-tonnage flexible flat actuator according to claim 1, wherein the retainer is made of die steel.
12. The calibration system of the large-size large-tonnage flexible flat actuator is characterized by comprising a calibration rack, cushion blocks and a pressure measurement device of the large-size large-tonnage flexible flat actuator, wherein the calibration rack is provided with a cylindrical cavity, the cushion blocks are positioned in the cavity and attached to two sides of the cavity, an installation space is formed between the cushion blocks at two sides, the large-size large-tonnage flexible flat actuator is positioned in the installation space and is positioned in the center of the cavity, the pressure measurement device is positioned in the installation space and is positioned at one side or two sides of the large-size large-tonnage flexible flat actuator, and one side of the pressure measurement device is directly contacted with the large-size large-tonnage flexible flat actuator or is contacted with the large-size large-tonnage flexible flat actuator through the cushion plates, and the other side of the pressure measurement device is provided with counter force by the cushion blocks.
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