JP2010271294A - Contact-pressure measuring method of air filling type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring method that at low cost and readily measures contact pressure, such as, compression of clothes and the body pressure of a chair or bed at two or more places with one pressure gauge having one built-in pressure sensor, and intermittently measures the changes due to passage of time, without disturbing routine movements. <P>SOLUTION: The contact pressure measuring method includes a pressure sensing sensor that senses the contact pressure and where a tube 2 is attached to a bag 1 made of a soft film of non-elasticity; a cylinder 8 that has an exhaust hole 14 in a cylindrical side surface of volume A and where a piston valve 9 operated with a compression spring 12 is while blocking the opening of the hollow tube 7; and a pressure gauge 6 for measuring the differential pressure from the atmosphere. The cylinder 8, the pressure gauge 6, and a connection hole 5 for connecting the tube 2 are interconnected through piping. When the tube 2 of the bag 1 between a measuring surface D and a non-measuring object C is connected to the connection hole 5, a cock 13 is pulled; the cock is released; the piston valve 9 presses out the air of volume A; and the pressure is measured by the pressure gauge 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

Industrial application fields

  The present invention relates to a method for measuring contact pressure on a flexible surface such as pressure or restraint pressure on a living body when wearing clothes or tools, or body pressure when using a bedding or a chair.

  A conventional method for measuring the contact pressure on a flexible surface is to contain a small amount of air in a soft bag and place it between the contacts to receive and measure the pressure. It is used as an easy-to-understand measurement method by calibrating at deep water pressure, confirming that reproducibility and measurement accuracy are good, changing water into hot water, and confirming that there is little heat effect. The measurement is performed in advance by inserting air into the bag of the pressure sensor and connecting it to the pressure sensor with a tube. Then, the pressure sensor is installed at the site, and the object to be measured is mounted on it and measured. It was a measurement with a single pressure sensor.

Problems to be solved by the invention

  If possible, it is required to be able to measure two or more locations with a single pressure sensor easily and inexpensively, and to measure temporal changes intermittently without restricting daily behavior with a connected tube or the like. There are a lot of socks and tools with strong pressure in recent years for health purposes and swelling countermeasures, etc.To see the strength and effect of those pressures, the time to start pressing and the time that pressure has continued, the pressure strength and effects Correlations such as time, physiological changes, and body shape changes appear in the measured values, and are parameters such as tool selection, evaluation, and usage. Conventionally, when measuring two or more locations with a single pressure sensor, it is necessary to remove the measurement object once mounted, reattach the pressure sensor to another part, and re-mount it. In order to reattach a certain fiber or the like to the same state, it is very troublesome to adjust the same position by compression and friction. Due to factors such as misalignment of equipment wearing, changes in material expansion / contraction characteristics, changes in the material and frictional environment due to moisture such as sweat, and differences in wrinkle conditions, a combined reproduction error occurs. Moreover, in order to measure a time-dependent change, it is necessary to carry out in the state which a pressure receiving sensor and the measuring device main body were connected with the tube, and daily behavior is restricted.

Means for solving the problem

  In order to perform multipoint measurement with a single pressure sensor, the pressure is measured by pushing a predetermined amount of air into the pressure sensor of the bag 1 already sandwiched between the contacts. Many pressure sensors can be attached to each part and measured with one pressure sensor. As a device configuration, a pressure receiving sensor in which a tube 2 is attached to a bag 1 made of a soft, non-stretchable film for sensing contact pressure shown in FIGS. 1 and 6, a cylindrical volume A, and an exhaust hole 14 on a side surface. The piston valve 9 with the cock 13 actuated by the push spring 12 works to close the mouth of the hollow tube 7 and drives to the position passing through the exhaust hole 14, and the differential pressure between the air and the atmosphere It consists of the pressure gauge 6 to measure. The cylinder 8, the pressure gauge 6, and the connection port 5 are connected by piping, and at the time of measurement shown in FIGS. 7 and 8, the tube 2 of the bag 1 between the measurement surface D and the measured object C is connected to the connection port 5, and the cock 13 is connected. By pulling and releasing, the piston valve 9 pushes out the volume A of air and measures it with the pressure gauge 6. A plurality of pressure sensors are attached to each part in advance, and then the measurement object C is attached and measured sequentially. At that time, the tube 2 end of the pressure receiving sensor is considered to have a length that slightly protrudes from the object C to be measured, or is wound around. In addition, the time-lapse measurement is performed with the pressure sensor attached to the part, and the pressure sensor and the pressure gauge are connected again.

Action

  As an operation, a pressure sensor 6 comprising a bag 1 and a tube 2 shown in FIGS. 1, 5 and 6, a cylinder 8 having a piston valve 9 and an exhaust hole 14, and a pressure gauge 6 for measuring a differential pressure between the pressure sensor 6 and the atmosphere. Alternatively, a pressure sensor 22 having a built-in pressure sensor and a display unit 15 is provided. In the pressure receiving sensor, a tube 2 is connected to a flat bag 1 made of a non-stretchable flexible film shown in FIG. The cylinder 8 of the device that pushes in and feeds air in advance determines the volume A of the air volume that expands to a thickness of 1 mm in an environment where the pressure-receiving sensor bag 1 has a diameter of, for example, 20 mm and is not pressurized. The mechanism of the cylinder 8 shown in FIG. 3 is hollow and has a connection port 5 at its end through a hollow tube 7, an exhaust hole 14 is provided in the side surface of the volume A, and a spring fixing plate 11 in the middle of a rod 10 with a cock 13. There is a piston valve 9 at the tip. The piston valve 9 is in a state of pushing and closing the mouth of the hollow tube 7 by the spring 12 with the spring fixing plate 11 as a fulcrum. The strength of the push spring 12 shown in FIG. 8 maintains the state where the opening to the hollow tube 7 is closed even when pressed by the measured pressure. The pressure gauge 6, the cylinder 8, and the connection port 5 are connected by a hollow tube 7, and the connection port 5 is a mechanism that can connect and disconnect the tube 2. With the above configuration, the pressure sensor bag 1 shown in FIG. 6 is sandwiched between the measurement object C and the measurement surface D, the end of the tube 2 is pulled out to the outside of the contact, and the tube 2 shown in FIGS. 3 and 7 is connected. After connecting to the port 5, when the cock 13 is pulled with a pulling force I and the tip of the piston valve 9 passes through the exhaust hole 14, air in the volume A, the hollow tube 7, the tube 2, etc. is sucked and the pressure gauge 6 is temporarily Although negative pressure is indicated, it falls within 0 value F. Next, the cock 13 shown in FIG. 8 is released, and the piston valve 9 pushes air of volume A to the hollow tube 7 to close the mouth, and is compressed into the hollow tube 7, pressure gauge 6, tube 2, and bag 1. The excess air from the volume A is discharged through the exhaust hole 14. Only the bag 1 is deformed and the compressed air compressed between the contact between the measurement object C and the measurement surface D is measured by the pressure gauge 6. The measurement value is a contact force between the object C to be measured and the measurement surface D, absorption due to softness, curvature, displacement stress between the contact surfaces due to deformation, and the influence of friction and the like, and the allowable error is the bag 1 This is a measurement method that receives pressure with extremely flat air, although it is the amount of stress concentrated on the thickness of the membrane material and compressed air.

  As an embodiment, the pressure sensor shown in FIGS. 1 and 3 is applied to a flat bag 1 made of a thin film made of a thin material which is non-stretchable and extremely soft so as not to spread by pressure, and is difficult to generate concentrated stress. A tube 2 is provided. The bent end of the tube 2 is open so as not to be crushed by the pressure to be measured. The cylinder 8 of the device for extruding the air is set in advance with the volume of air as the volume A and the amount of air that expands to 1 mm or 0.5 mm in a state where the pressure sensor bag 1 is not pressurized with a diameter of 20 mm in advance. . The mechanism of the cylinder 8 is cylindrical and is provided with a connection port 5 through a hollow tube 7 at the end, an exhaust hole 14 is provided in the side surface of the volume A from the end, and a spring fixing plate is provided in the middle of the rod 10 with the cock 13. 11 is provided with a push spring 12 and a piston valve 9 at the tip. Between the cylinder 8 and the spring fixing plate 11 shown in FIG. 8, the piston valve 9 is in a state of pushing and closing the hole to the hollow tube 7 by the pressing spring 12. The pressing spring 12 is strong enough to keep the mouth to the hollow tube 7 closed even when pressed by the measured pressure from the hollow tube 7. The pressure gauge 6, the cylinder 8, and the connection port 5 are connected by a hollow tube 7, and the connection port 5 is a mechanism that can be connected to and disconnected from the tube 2. At the time of measurement with the above configuration, the end of the tube 2 of the bag 1 pressed between the object C to be measured and the measurement surface D shown in FIG. 6 is exposed to the outside, and the tube 2 shown in FIG. The tip of the integral piston valve 9 is pulled by the pulling force I of the finger 21 through the exhaust port 14. At this time, the value of the pressure gauge 6 temporarily becomes negative pressure and settles to 0 value F. The cock 13 is released and the piston valve 9 shown in FIG. At this time, the excess air shown in FIG. 7 is exhausted through the exhaust hole 14 to push the volume A of air into the hollow tube 7, and the bag 1 pressed against the object C and the measurement surface D becomes compressed air B, and the tube 2. The inside of each hollow tube 7 has the same pressure, and the measurement value G of the pressure gauge 6 is measured.

  2 is provided between the tube 2 and the connection port 5 of the pressure sensor shown in FIG. 2, so that even if the tube 2 is manufactured with a short pressure sensor and is attached to the site, daily behavior is not hindered. Intermittent measurement over time is possible.

  The piston valve 9 of the cylinder 8 can be moved by a pulling spring 16 shown in FIG. The piston valve 9 can be moved by an air pump, an air cylinder, a hydraulic cylinder, or a force such as magnetic force.

  In addition to the air-filled volume A, there are two or more cylinders 8 having a volume E that is half of the volume A shown in FIG. 9. The cylinder 8, the pressure gauge 6, and the connection port 5 are connected by a hollow tube 7. The amount of air filling can be selected by pulling the cock 13 of the cylinder 8 with an appropriate amount of air filling depending on the difference in the size of the sensor bag 1 or the hardness of the measurement surface D. For example, the smaller bag 1 is selected to have a smaller amount of air, the thickness is thin, and the concentrated stress is small. In addition, the difference in softness of measurement surface D is considered without sagging of bag 1 due to pressure, so it does not sink on a hard surface such as a mannequin, so half the amount is selected, and a soft living body with the same body shape selects a standard amount and measures it. In this case, the tolerance is small and the comparison can be made.

  A suction hole 33 is provided on the side surface of the cylinder 8 shown in FIGS. 14, 15 and 16 at a position of a suction volume K larger than the volume A, and the cock 13 is pulled with a pulling force I while closing the exhaust hole 14 with a finger. The suction of the suction volume K is performed until the valve 9 passes through the suction hole 33, the air remaining in the bag 1 is sucked through the tube 2 to become negative pressure, and when the valve 9 passes through the suction hole 33, the air is discharged from the suction hole 33 to the atmosphere. Enters and the pressure becomes 0 value F. When the finger of the exhaust hole 14 is released to release and the cock 13 is released, the piston valve 9 pushes out the air of volume A. This is a case where the pressure sensor is always incorporated in a measurement dummy or the like, and is required for measurement in which air is first introduced into the pressure sensor and the object to be measured C is attached to the pressure sensor afterward. As a device that operates the exhaust hole 14 semi-automatically instead of a finger, the cock 13 shown in FIGS. 14, 15, and 16 is provided outside the case frame 39, and a bearing 40 is provided inside the case frame 39. The rotary shaft 36 is provided with a valve 34 at the tip, a push button 38 is provided at the opposite end, and the exhaust hole 14 shown in FIG. 14 and FIG. The valve 34 acts on. After the suction, the push button 38 is operated with the pushing force L shown in FIG. 16, the valve 34 opens the exhaust hole 14 with the rotating shaft 36, the cock 13 is released, and the piston valve 9 is operated to push out the volume A air.

  In consideration of durability, in order to protect the bag 1 and prevent displacement, the mutual displacement between the measurement object C and the measurement surface D of the flexible body 31 between the contacts shown in FIGS. Arise. This is because when the object to be measured C is mounted, the deformation of the object to be measured C and the measurement surface D is caused by the difference in the deformation amount, the surface friction between each other, the friction increase due to sweating, etc. large. The sensitive and thin delicate bag 1 is inferior in durability against lateral misalignment because the inside is an air layer, so it is necessary to consider how to put it on the site. By covering with a cover tape 23 between the bag 1 and the measured object C, for example, the cover tape 23 made of a film material shown in FIGS. When the bag 1 is used, it slides sideways when there is little friction with respect to the lateral displacement force. The bag 1 undergoes thickness deformation in the direction substantially perpendicular to the measurement surface D and receives a force. For this purpose, the cover tape 23 is surrounded by an adhesive surface 26, and the central portion is made a non-adhesive surface 24 that is slightly wider than the bag 1 in consideration of slippage and deformability of the bag 1 in contact, and a viewing hole 25 is provided at the center thereof. . A mark 32 is also attached to the center of the bag 1, and when arriving at the site, the center is aligned while looking at the mark 32 of the bag 1 from the viewing hole 25.

  Confirmation of air sealing by the cylinder 8 can be confirmed by a press tester that completely crushes the bag 1 and performs air sealing. A hinge 28 is attached to the double clip 27 shown in FIG. 10 with a fixing material 30, and a relaxation material 29 is affixed to the contact surface of the plate of the hinge 28 so as not to damage the bag. The strength of crushing the double clip 27 is that the bag 1 is compressed in the piping such as the tube 2, the hollow tube 7, the pressure gauge 6, etc. while the bag 1 is crushed after the operation of sealing the air of the volume A, It is. At the time of the press test, the bag 1 is sandwiched between the relaxation materials 29 and the tube 2 is connected to the connection port 5. After the air is filled with the cock 13, the measured maximum value H under this condition is displayed on the pressure gauge 6. When the measurement maximum value H decreases with the passage of time while being sandwiched, it can be determined that there is an abnormality in air leakage, and the reproducibility of the air filling amount can be confirmed from the measured values by repeating the sealing operation several times.

The invention's effect

  As described above, in the measurement of the socks 18, several pressure receiving sensors composed of the bag 1 and the tube 2 shown in FIG. 17 are attached to each part of the lower limb 17 and the socks 18 are worn and prepared. The measurement with the pressure measuring device 22 provided with one pressure sensor is performed by connecting the tube 2 of the pressure sensor attached to the site to the connection portion 4, connecting the relay tube 3 to the connection port 5, and pulling the cock 13 to perform air sealing operation. The measured value G is shown on the display unit 15. Multipoint measurement is possible by connecting the measurement operation to the tube 2 of each pressure receiving sensor and repeating it. In particular, around the calf of 19 parts of the rubber band 19 that is strongly pressed by the sock 18, the difference in pressure value is large, the pressure effect on the living body, the pressure that does not cause the sock 18 to slide, the width of the rubber band 19 and the contact area. Correlation and correlation with friction can be clarified. In addition, the change with time is measured by connecting the pressure sensor and the pressure measuring device 22 again after a while with the pressure sensor attached to the part. 13 and 17, a strong shear stress is generated on the surface when the object C to be measured such as the sock 18 which is pressed is attached or detached. When the non-stretchable and soft membrane delicate bag 1 is attached to the side face D, it is indispensable to protect the cover with the cover tape 23 and to prevent displacement.

Sectional view of the configuration of the present invention Sectional drawing of composition provided with relay part of the present invention Sectional view in the middle of air sealing operation of the present invention Sectional drawing of the Example by the tension spring of this invention External view of the present invention at the preparatory stage of a pressure measuring instrument Sectional view of the measurement preparation state of the present invention Sectional view during measurement operation of the present invention Sectional view during measurement of the present invention Sectional view provided with two cylinders 8 of the present invention Sectional view during press test of the present invention Front view of pressure sensor and cover tape of the present invention JJ sectional view of pressure sensor and cover tape of the present invention Sectional view of the measuring section when using the cover tape of the present invention Sectional view of the suction mechanism of the present invention Sectional view during suction action of the present invention Sectional drawing at the time of air enclosure of the suction mechanism of the present invention External view of measuring several pressure sensors on the lower limb of the present invention

1 is a bag 2 is a tube 3 is a relay tube 4 is a connection part 5 is a connection port 6 is a pressure gauge 7 is a hollow tube 8 is a cylinder 9 is a piston valve 10 is a rod 11 is a spring fixing plate 12 is a push spring 13 is a cock 14 , Exhaust hole 15, display portion 16, pull spring 17, leg 18, sock 19, rubber band 20, adhesive tape 21, finger 22, pressure measuring device 23, cover tape 24, non-adhesive surface 25, viewing hole 26, adhesive surface 27, double clip 28, hinge 29, relaxation material 30, fixing material 31, flexible body 32, mark 33, suction hole 34, valve 35, arm 36, rotary shaft 37, valve spring 38, push button 39, case frame Reference numeral 40 denotes a bearing A, a volume B, a compressed air C, a measured object D, a measuring surface E, a half volume F, a zero value G, a measured value H, a measured maximum value I, a tensile force J, a cross section of a pressure sensor and a cover tape Line K is the suction volume L is the pressing force

Claims (10)

(A) The hollow cylinder 8 includes a connection port 5 at the end, an exhaust hole 14 on the side surface of the volume A, and a piston valve 9 that pushes and closes the port connected to the connection port 5 by a push spring 12. The strength of the push spring 12 can maintain a state in which the mouth of the hollow tube 7 is closed without being pushed back by the measurement pressure from the connection port 5 side. The piston valve 9 is driven to a position that passes through the exhaust hole 14.
(B) In the pressure receiving sensor, a tube 2 that is bent freely so as not to be crushed by the measurement pressure is connected to a non-stretchable soft bag 1.
(D) The pressure gauge 6 and the cylinder 8 are piped and connected to the connection port 5. The connection port 5 can connect and disconnect the tube 2 of the pressure sensor.
An air-filled contact pressure measurement method configured as described above. The air-filled contact pressure measurement method according to claim 1, further comprising a relay tube 3 between the tube 2 and the connection port 5 of the pressure sensor. The air-filled contact pressure measurement method according to claim 1 or 2, wherein the piston valve 9 closes the opening of the hollow tube 7 with the pull spring 16 instead of the push spring 12 of the cylinder 8. 4. The air-filled contact pressure measuring method according to claim 1, wherein the piston valve 9 of the cylinder 8 is not a spring but a mechanism for closing a mouth of the hollow tube 7 driven by a pump, magnetic force, hydraulic pressure or the like. The air-filled contact pressure measurement method according to claim 1, wherein two or more cylinders 8 are provided, and the cylinder 8, the pressure gauge 6 and the connection port 5 are connected by piping. 6. The air-filled contact pressure measurement method according to claim 1, wherein a suction hole 33 is provided on a side surface at an end of the suction volume K having a volume larger than the volume A of the cylinder 8. The air-filled contact pressure measurement method according to claim 6, wherein the exhaust hole 14 of the cylinder 8 can be opened and closed by a valve 34. The air-filled contact pressure measurement method according to claim 1, wherein the bag 1 is covered with a cover tape 23 and a pressure receiving sensor is attached to the site. 9. The air-filled contact pressure measurement method according to claim 8, wherein the cover tape is provided with a viewing hole, the center portion is a non-adhesive surface and is slightly wider than the size of the bag, and the periphery thereof is an adhesive surface. The air-filled contact pressure measurement method according to claim 1, further comprising a press testing machine in which a hinge 28 is attached to the double clip 27, and a contact surface of the hinge 28 is covered with a relaxation material 29.

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