Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1457—Piston rods
  • F15B15/1461—Piston rod sealings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/20—Other details, e.g. assembly with regulating devices
  • F15B15/28—Means for indicating the position, e.g. end of stroke
  • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
  • F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/0063—Connecting non-slidable parts of machine tools to each other
  • B23Q1/0081—Connecting non-slidable parts of machine tools to each other using an expanding clamping member insertable in a receiving hole
  • B23Q1/009—Connecting non-slidable parts of machine tools to each other using an expanding clamping member insertable in a receiving hole the receiving hole being cylindrical or conical
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
  • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
  • B23Q3/06—Work-clamping means
  • B23Q3/08—Work-clamping means other than mechanically-actuated
  • B23Q3/082—Work-clamping means other than mechanically-actuated hydraulically actuated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/002—Sealings comprising at least two sealings in succession
  • F16J15/008—Sealings comprising at least two sealings in succession with provision to put out of action at least one sealing; One sealing sealing only on standstill; Emergency or servicing sealings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6306—Electronic controllers using input signals representing a pressure

Definitions

• This invention relates to a cylinder device, and in particular to a cylinder that is used in a cylinder device that fixes an object to be clamped.
• Patent Document 1 discloses a mechanism for detecting the position of the piston part in each state.
• Patent Document 1 discloses a cylinder having an output member that is moved up and down inside a housing by a pressurized fluid.
• a first valve chamber is provided between the bottom wall of the housing and the output member.
• a second valve chamber is hollowed out in the piston part and opens to the first valve chamber side.
• a valve rod protrudes from the bottom wall of the housing and is inserted into the second valve chamber.
• a system of compressed gas for position detection is arranged using the first valve chamber, valve rod, and second valve chamber, separate from the flow path of the pressurized fluid that drives the output member. The position of the output member is detected depending on whether the pressure of the system when compressed gas is sent to this system is high, low, or intermediate.
• the mechanism for detecting the position of the output member in Patent Document 1 is such that the second valve chamber is hollowed out in the output member, and the valve rod protruding from the bottom wall of the housing is inserted into the second valve chamber, making it difficult to apply to small cylinder devices.
• An object of the present invention is to provide a cylinder device provided with a mechanism for detecting the position of an output member in three stages by utilizing the outer periphery of the piston rod of the output member and the inner wall of the housing.
• a cylinder device having a piston that moves up and down inside a housing by pressure fluid, A piston rod fixed to the piston; a seal member attached to a seal groove on an outer peripheral wall of the piston rod; a hollow inner wall within the housing along which the piston rod moves up and down; the housing is provided with a supply passage that supplies compressed gas to the inside of the hollow inner wall, a discharge passage that discharges the compressed gas supplied to the inside of the hollow inner wall to the atmosphere, and a pressure loss passage that allows the compressed gas supplied to the inside of the hollow inner wall to pass with a larger pressure loss than through the supply passage and the discharge passage and is in communication with the discharge passage,
• the hollow inner wall of the housing has a sliding surface area having an inner diameter such that the sealing function can be effectively performed when the seal member abuts against the sliding surface area, and a loose insertion area having an inner diameter large enough that the sealing function of the seal member does not work at all, the sliding surface areas sandwiching one loose insertion area from above and below, and the two sliding surface areas are further
• the present invention provides a cylinder device having a piston that moves up and down within a housing by pressure fluid, A piston rod fixed to the piston; a seal member attached to each of the seal grooves spaced apart above and below the outer peripheral wall of the piston rod; a hollow inner wall within the housing along which the piston rod moves up and down; the housing is provided with a supply passage that supplies compressed gas to the inside of the hollow inner wall, a discharge passage that discharges the compressed gas supplied to the inside of the hollow inner wall to the atmosphere, and a pressure loss passage that allows the compressed gas supplied to the inside of the hollow inner wall to pass with a larger pressure loss than through the supply passage and the discharge passage and is in communication with the discharge passage,
• the hollow inner wall of the housing has a sliding surface area having an inner diameter such that the sealing function can be effectively performed when the seal member abuts against the sliding surface area, and a loose insertion area having an inner diameter large enough that the sealing function of the seal member does not work at all, the sliding surface areas sandwiching one loose insertion area from above and below
• the present invention provides a cylinder device having a piston that moves up and down within a housing by pressure fluid, A piston rod fixed to the piston; a seal member attached to each of the seal grooves spaced apart above and below the outer peripheral wall of the piston rod; a hollow inner wall within the housing along which the piston rod moves up and down; the housing is provided with a supply passage that supplies compressed gas to the inside of the hollow inner wall, a discharge passage that discharges the compressed gas supplied to the inside of the hollow inner wall to the atmosphere, and a pressure loss passage that allows the compressed gas supplied to the inside of the hollow inner wall to pass with a larger pressure loss than through the supply passage and the discharge passage and is in communication with the discharge passage,
• the hollow inner wall of the housing has a sliding surface area having an inner diameter such that the sealing function can be effectively performed when the seal member abuts against the sliding surface area, and a loose insertion area having an inner diameter large enough that the sealing function of the seal member does not work at all, the sliding surface areas sandwiching one loose insertion area from above and below
• the present invention provides a cylinder device having a piston that moves up and down within a housing by pressure fluid, A piston rod fixed to the piston; a seal member attached to a seal groove on an outer peripheral wall of the piston rod; a hollow inner wall within the housing along which the piston rod moves up and down; an annular valve member fitted onto the piston rod;
• the housing is provided with a supply passage for supplying compressed gas to the inside of the hollow inner wall, and a discharge passage for discharging the compressed gas supplied to the inside of the hollow inner wall to the atmosphere,
• a protrusion is provided below the seal groove of the piston rod to push down the annular valve member, a sliding surface area having an inner diameter such that the seal member comes into contact with the sliding surface area and effectively functions as a seal; a loose insertion area having an inner diameter so large that the seal member does not function at all; and a valve member area having an inner diameter large enough to allow the annular valve member to move up and down, the upper side of which is surrounded by a ring surface to accommodate the annular
• the position of the output member can be detected in three stages by utilizing the outer periphery of the piston rod and the inner wall of the housing, which allows the cylinder device to be made more compact.
• FIG. 1A shows a cylinder device according to a first embodiment of the present invention, with FIG. 1A being a cross-section in an unclamped state, FIG. 1B being a cross-section of a housing, FIG. 1C being a cross-section of an output member 6, and FIG. 1D being an oblique view of a clamp rod.
• 2A shows a cylinder device according to a first embodiment, with FIG. 2A being a cross-sectional view in a clamped state and FIG. 2B being an enlarged view of an annular valve member.
• FIG. 2 is a cross-sectional view of the cylinder device of the first embodiment (in an overstroke state).
• 4A shows a cross-sectional view of a second embodiment of the present invention, in which FIG.
• FIG. 4A shows an unclamped state
• FIG. 4B shows a clamped state
• FIG. 4C shows a cross-sectional view of the clamped state
• 5A shows a cross-sectional view of a third embodiment of the present invention, in which FIG. 5A shows an unclamped state
• FIG. 5B shows a clamped state
• FIG. 5C shows a cross-sectional view of the clamped state
• 6A shows a fourth embodiment of the present invention, with FIG. 6A showing an unclamped state, FIG. 6B showing a clamped state
• FIG. 6C showing a cross-sectional view of the clamped state
• 7A shows a fifth embodiment of the present invention, with FIG. 7A showing an unclamped state, FIG.
• FIG. 7B showing a clamped state
• FIG. 7C showing a cross-sectional view of the clamped state
• 8A shows a sixth embodiment of the present invention, with FIG. 8A showing an unclamped state, FIG. 8B showing a clamped state, and FIG. 8C showing a cross-sectional view of the clamped state.
• the cylinder device has a housing and an output member.
• the output member has a piston rod that moves up and down inside the hollow inner wall of the housing, a clamp rod driven by the piston rod, and a gripping member.
• the direction in which the piston rod moves up and down is called the direction of axis c, and when we say “up” or “down,” we do not mean the direction of gravity.
• the direction in which the output member is pulled into the housing in the direction of axis c is called “down,” and the direction in which it is extended from the housing is called “up.”
• the piston, piston rod, and clamp rod are collectively called the output member.
• the cylinder device of the present invention uses compressed gas to detect the position of the output member in three stages.
• the compressed gas is supplied to the cylinder device through a system separate from the pressurized fluid that moves the output member up and down. Air, nitrogen gas, etc. can be used as the compressed gas.
• the housing is provided with a passage for supplying compressed gas and a passage for discharging it to the atmosphere. These two passages are referred to as a supply passage and a discharge passage.
• the supply passage and the discharge passage are connected via the hollow space inside the housing and between the piston rod, and the supply passage and the discharge passage are in a closed, partially closed, or open state depending on the vertical position of the piston rod. The vertical position of the piston rod is detected by measuring the pressure of the passage that supplies compressed gas.
• low pressure can be defined as “low pressure” when the pressure detected by the pressure sensor is equal to or lower than a first threshold value previously set in the pressure sensor, “high pressure” when the pressure is equal to or higher than a second threshold value that is higher than the first threshold value, and “medium pressure” when the pressure is between the first and second threshold values.
• a first threshold value and a second threshold value may be set in one pressure sensor. Two pressure sensors may be provided in one passage. When two pressure sensors are provided, the first threshold value may be set in one pressure sensor, and the second threshold value may be set in the other pressure sensor. If the pressure sensor acquires pressure values as numbers, a first threshold and a second threshold can be set in the comparator to classify the output of the pressure sensor into "high pressure,” “medium pressure,” and "low pressure.”
• the outer wall structure of the piston rod and the hollow inner wall structure of the housing are what change the state between closed, partially closed, and open.
• an annular valve member is used as necessary.
• the annular valve member is a member that moves between the hollow inner wall of the housing and the outer wall of the piston rod, separate from the piston. Also, the combination of these is selected depending on what pressures should be detected when the piston rod is in the raised position, midway position, and lowered position.
• outer peripheral wall of the piston rod and the hollow inner wall of the housing are formed by combining several compartments and areas in the vertical direction.
• the outer peripheral wall of the piston rod has approximately the same diameter, but within a limited range of the outer peripheral wall of the piston rod, there are the following sections: 1) S seal section (hereinafter, referred to as "11" in each embodiment) in which a seal member is attached around the entire circumference. An O-ring or a packing is used as the seal member. 2) A push section (see reference numeral "12") that pushes down the annular valve member as the piston rod descends.
• One or two of the S seal sections 11, or one of the S seal sections 11 and the push section 12 in combination, are mounted on the outer circumferential wall of the piston rod.
• the regions of the hollow inner wall of the housing are as follows: 1) A sliding surface area having an inner diameter that allows the seal member of the piston rod to come into contact with and effectively perform the sealing function (hereinafter, the reference number is commonly designated as "13" in each embodiment).
• the reference number is commonly designated as "13" in each embodiment.
• a gap is provided between the sliding surface area and the outer peripheral wall of the piston rod.
• a loose insertion area having a large inner diameter such that the sealing function of the piston rod seal member does not function at all (ibid., reference number "14").
• a passage connection region in which the A passage is connected to the loose insertion region ibid., reference number "15"
• a B passage connection area in which the B passage is connected to the loose insertion area ibid., reference number "16”
• a pressure loss passage connection region in which a pressure loss passage is connected to the loose insertion region ibid., reference numeral "17").
• the loose insertion region is connected to the B passage or the A passage via a pressure loss passage.
• the pressure loss passage is a passage having a larger pressure loss than either the A passage or the B passage. Specifically, the hole diameter can be reduced or an obstacle can be inserted to restrict the flow.
• the annular valve member can move up and down within the valve member region.
• the valve member region is also connected to the B passage.
• the annular valve member which is applied as necessary, has a groove on its upper surface, and when the grooved upper surface of the annular valve member comes into surface contact with the ring surface above the valve member region, the ring surface and the groove form a pressure loss passage which communicates with passage B.
• the description will be given on the assumption that the A passage is a supply passage and the B passage is a discharge passage.
• the cylinder device 1 is a cylinder device in which the output member is at "high pressure” when in the raised position, at “medium pressure” when in an intermediate position, and at “low pressure” when in the lowered position.
• FIG. 1B only the housing 2 is shown.
• the housing 2 is fixed to a table T, which serves as a fixed base.
• the housing 2 is hollow and cylindrical, and the hollow inner wall includes, from the top, a collar portion 2a, a pressure detection portion 2b, and a cylinder portion 2c.
• the output member 6 includes a piston 7, a piston rod 3, a clamp rod 4, and a pair of slider pieces 5 that grip the workpiece.
• the piston rod 3 is cylindrical, and the piston 7 is fixed to the outer circumferential surface at the lower end.
• the piston 7 is inserted into the cylinder section 2c.
• the clamp rod 4 is inserted into the hollow inner wall of the piston rod 3 from below and is stopped by the flange section 3a provided on the inner edge of the upper end.
• a spacer 8 is inserted into the hollow section from the lower side of the piston rod 3, and is fixed by a stop ring 8a so as not to fall out of the hollow section.
• An S seal section 11 is provided on the outer periphery of the piston rod 3. In the S seal section 11, an O-ring is attached as a seal member 11a in a ring groove 11b. The seal member 11a seals the outer periphery of the piston rod 3 all around.
• a protrusion 12a is provided around the outer periphery below the S seal section 11.
• This protrusion 12a is a protrusion that pushes down the annular valve member 10, and the area where the protrusion 12a is provided is the push section 12.
• the areas of the piston rod 3 other than these two areas generally have the same diameter, which is smaller than the outer diameter of the seal member 11a.
• Fig. 1D shows an oblique view of the tip of the clamp rod 4.
• a cam portion 4a is provided at the tip of the clamp rod 4.
• the cam portion 4a has two inclined surfaces 4b on either side of the axis, which slope downward toward the axis c.
• a number of seal members are arranged between the piston 7, piston rod 3, and spacer 8 to fill the gaps between these members.
• the collar portion 2a of the housing 2 supports the output member 6 in the direction of the axis c so that it can move up and down.
• the cylinder portion 2c houses the piston 7 so that it can move up and down.
• the pressure detection unit 2b has, successively from top to bottom, an A passage connection area 15 that communicates with the A passage Ap of the housing 2, a sliding surface area 13 having an inner diameter that can be sealed by the seal member 11a of the S seal section 11, a loose insertion area 14 having a large inner diameter that cannot be sealed by the seal member 11a of the S seal section 11, and a valve member area 18 that has an inner diameter larger than the loose insertion area and within which the annular valve member 10 can slide.
• the upper ceiling surface of the valve member area 18 is the ring surface 2d.
• the annular valve member 10 is able to slide up and down on the outer circumference of the piston rod 3 below the push section 12, and a groove 10b is provided on the upper surface 10a of the annular valve member 10 (see FIG. 2B).
• the groove 10b is provided in a part of the upper surface 10a of the annular valve member 10 in the radial direction of the axis c.
• the valve member region 18 communicates with the B passage Bp only through the pressure loss passage by the groove 10b.
• the gap between the upper surface 10a of the annular valve member 10 and the ring surface 2d opens, and the pressure loss passage cannot be maintained.
• a mount 9 is provided on the upper end side of the housing 2.
• the mount has a seating surface 9a on which the workpiece is placed, and a guide portion 9b that guides the slider piece 5 in the radial direction of the axis c.
• a gasket 9c is placed between the outer periphery of the slider piece 5 and the mount 9 to prevent the intrusion of dust.
• a cap 9d is placed on the top of the mount 9 as necessary.
• the pressure fluid on the clamp side is supplied to the upper side of the piston 7 via flow path Th1 in the table T and flow path Hh in the housing 2.
• the space above the piston 7 is the clamp chamber CL into which the pressure fluid flows when the cylinder device 1 clamps the workpiece, and is surrounded by the upper surface of the piston 7, the cylinder portion 2c, and the lower surface of the annular valve member 10.
• the pressurized fluid is supplied to the underside of the piston 7 via the flow path Th2 in the table T.
• the unclamping chamber UC is surrounded by the underside of the piston 7, the cylinder portion 2c, the underside of the piston rod 3, and the underside of the spacer 8.
• the clamping operation of the cylinder device will now be described.
• the cylinder device 1 shown in Fig. 1A is in an unclamped state.
• the pressure fluid is discharged from the clamp chamber CL, and the pressure fluid is supplied to the unclamped chamber UC via the flow path Th2.
• the output member 6 is in the raised position.
• the cylinder device 1 shown in FIG. 2A is in the clamped state.
• a gripping hole WH is drilled in the workpiece W.
• the slider piece 5 is inserted into the gripping hole WH.
• pressurized fluid is discharged from the unclamping chamber UC via flow path Th2
• pressure fluid is supplied to the clamping chamber CL via flow paths Th1 and Hh.
• the cam surface 5a provided at the tip of the clamping rod 4 pushes the slider piece 5 in the radial direction of the axis c, gripping it from the inside of the gripping hole WH.
• the pressure fluid in the clamping chamber CL is discharged, and pressure fluid is supplied to the unclamping chamber UC.
• the cylinder device 1 shown in Figure 3 is in an overstroke state where the output member 6 has descended too far for some reason.
• the size of the gripping hole WH may be too large, or the slider piece 5 may have worn down to a small diameter.
• the cylinder device 1 is in a clamped state, but the workpiece W is not actually gripped accurately.
• the compressed gas passage Tp from the table T is connected to the flow path Hp of the housing 2, and branches into two, a passage Mp to the mount portion 9 and a passage A Ap.
• the passage to the mount portion 9 is open to the atmosphere.
• the passage A Ap is connected to the A passage connection area 15 of the pressure detection portion 2b.
• the flow path through which the compressed gas flows is indicated by light ink.
• the compressed gas is released to the atmosphere through the flow path Mp of the mount portion 9. Therefore, when the pressure of the compressed gas is measured at a position where the compressed gas is supplied (not shown), it is in a low pressure state.
• the flow path Mp of the mount portion 9 is blocked by the workpiece W.
• the S seal section 11 is located at the sliding surface area 13 and the sealing function is working. Therefore, there is no outlet for the compressed gas at the end of the A passage Ap. Therefore, the pressure of the compressed gas in the A passage Ap is maintained.
• the pressure is measured at the position where the compressed gas is supplied, a high pressure is detected, and it is possible to determine whether the workpiece W is mounted or not. This state is an unclamped state. Note that even if the workpiece W is mounted, if it is mounted at an angle, the workpiece W is not in close contact with the seating surface 9a, and the compressed gas will leak. In this case, it can also be determined that the workpiece W is not mounted properly.
• a groove 10b is provided in the annular valve member 10, and by moving the annular valve member 10, the groove 10b cooperates with the ring surface 2d to form a pressure loss passage, and the upper surface 10a of the annular valve member 10 and the ring surface 2d separate.
• three states can be detected.
• the compressed gas in table T is split into two, one of which is supplied to mount section 9 and the other to pressure detection section 2b, but it is also possible to prepare two systems of compressed gas in table T, and send one to mount section 9 and the other to pressure detection section 2b separately.
• the position of the output member 6 can be detected in three stages by utilizing the outer periphery of the piston rod 3 and the inner wall of the housing 2, so that the cylinder device 1 can be made smaller.
• Example 2
• FIG. 4 shows a cylinder device 20 according to a second embodiment.
• the cylinder device 20 is a cylinder device that has "high pressure” when the output member 6 is in the raised position, “low pressure” when it is in an intermediate position, and “medium pressure” when it is in the lowered position.
• Example 2 The difference from Example 1 is the structure of the piston rod of the output member 6 and the pressure detection section of the housing.
• the pressure detection section 2b is arranged, from the top, in the order of A passage connection area 15, sliding surface area 13, loose insertion area 14, and valve member area 18, but in Example 2, the pressure detection section 2b is arranged, from the top, in the order of A passage connection area 15, upper sliding surface area 13, pressure loss passage connection area 17, lower sliding surface area 13, and B passage connection area 16, and does not have the valve member area 18.
• the pressure loss passage connection area 17 is provided with a pressure loss passage Np that communicates with the B passage Bp.
• Example 2 there is no valve member area and no annular valve member 10, and instead the portion corresponding to the annular valve member 10 is part of the housing 2, and the housing 2 and the piston rod 3 are directly sealed by an O-ring S3. Therefore, the O-rings S1 and S3 prevent compressed gas from leaking into the atmosphere or the clamp chamber CL above and below the pressure detection section 2b.
• no push section 12 is provided on the outer periphery of the piston rod 3, and only one S seal section 11 is provided.
• one system of compressed gas in table T was branched into two, one of which was supplied to mount section 9 and the other to pressure detection section 2b, but in this embodiment, two systems of compressed gas are prepared in table T, one of which is sent to mount section 9 and the other to passage A Ap.
• FIG. 4 the passage on the table T side that sends compressed gas to passage A Ap is not shown.
• the output member 6 descends and disengages from the upper sliding surface area 13.
• the seal of the S seal section 11 does not function, and the upper sliding surface area 13 communicates with the pressure loss passage connection area 17, the lower sliding surface area 13, and the B passage connection area 16.
• the pressure loss passage connection area 17 communicates with the B passage Bp via the pressure loss passage Np.
• the compressed gas also communicates with the passage connection area 16 via the lower sliding surface area 13. Therefore, low pressure can be detected by measuring the pressure at the supply position of the compressed gas.
• Example 3 5 shows a cylinder device 30 of Example 3.
• the cylinder device is a cylinder device in which the pressure becomes “medium” when the output member 6 is in the raised position, “high” when the output member 6 is in the intermediate position, and “low” when the output member 6 is in the lowered position.
• Example 1 The difference from Example 1 is the structure of the piston rod 3 of the output member 6 and the pressure detection section 2b of the housing 2.
• the pressure detection section 2b of Example 3 consists of, from the top, the B passage connection area 16, the sliding surface area 13, the A passage connection area 15, the sliding surface area 13, and the pressure loss passage connection area 17, and unlike Example 1, it does not have the valve member area 18, nor does it have the annular valve member 10. Instead, the part corresponding to the annular valve member 10 is part of the housing 2.
• the piston rod 3 of Example 3 does not have the push section 12 of Example 1 on its outer periphery, but has two S seal sections 11 on the top and bottom.
• the spacing between the two S seal sections 11 is determined so that they can simultaneously perform a sealing function between the upper and lower sliding surface areas 13.
• the two S seal sections 11 that perform a sealing function sandwich the A passage connection area 15, thereby blocking the compressed gas in the A passage Ap.
• the operation of the cylinder device 20 will be described. 5A, the upper S seal section 11 is present in the B passage connection area 16, and the lower S seal section 11 is present in the upper sliding surface area 13. Therefore, the A passage connection area 15, the lower sliding surface area 13, and the pressure loss passage connection area 17 are in communication. Therefore, if the pressure is measured at the supply position of the compressed gas, the medium pressure due to the pressure loss passage Np can be detected.
• Example 4 6 shows a cylinder device 40 of Example 4.
• the cylinder device 40 is a cylinder device in which the output member 6 has a "medium pressure” when in the raised position, a “low pressure” when in an intermediate position, and a “high pressure” when in the lowered position.
• Example 4 The difference from Example 1 is the structure of the piston rod 3 of the output member 6 and the pressure detection section 2b of the housing 2.
• the pressure detection section 2b of Example 4 consists of, from the top, the A passage connection area 15, the sliding surface area 13, the pressure loss passage connection area 17, the sliding surface area 13, and the B passage connection area 16, and unlike Example 1, it does not have the valve member area 18, nor does it have the annular valve member 10. Instead, in Example 4, the part corresponding to the annular valve member 10 is part of the housing 2.
• the piston rod 3 of Example 4 does not have the push section 12 of Example 1 on its outer periphery, but has two S seal sections 11 on the top and bottom.
• the spacing between the two S seal sections 11 is determined so that they do not simultaneously perform a sealing function between the upper and lower sliding surface areas 13. This is the difference from the cylinder device 1 of Example 1, and the rest of the configuration is the same, so a description will be omitted.
• the seal member 11a of the lower S seal section 11 is present in the upper sliding surface area 13. Therefore, only the B passage connection area 16 is separated from the other areas, and the A passage connection area 15, the lower sliding surface area 13, and the pressure loss passage connection area 17 are in communication. By measuring the pressure at the compressed gas supply port, the medium pressure due to the pressure loss passage Np can be detected.
• Example 5 7 shows a cylinder device 50 of the fifth embodiment.
• the cylinder device is a cylinder device in which the output member 6 has "low pressure” when in the raised position, “high pressure” when in an intermediate position, and “medium pressure” when in the lowered position.
• Example 5 The difference from Example 1 is the structure of the piston rod 3 of the output member 6 and the pressure detection section 2b of the housing 2.
• the pressure detection section 2b of Example 5 consists of, from the top, a pressure loss passage connection area 17, a sliding surface area 13, an A passage connection area 15, a sliding surface area 13, and a B passage connection area 16, and unlike Example 1, it does not have a valve member area 18, nor does it have an annular valve member 10. Instead, in Example 5, the part corresponding to the annular valve member 10 is part of the housing 2.
• the outer periphery of the piston rod 3 in Example 5 does not have the push section 12 of Example 1, but has two S seal sections 11 on the top and bottom.
• the spacing between the two upper and lower S seal sections 11 is determined so that they can simultaneously perform their sealing function with the upper and lower sliding surface areas 13, respectively.
• the A passage connection area 15 is sandwiched between the two S seal sections 11, so that the compressed gas in the A passage Ap is blocked.
• the lower S seal section 11 is present in the upper sliding surface area 13. Therefore, the pressure loss passage connection area 17 is isolated from the other areas, while the A passage connection area 15, the lower sliding surface area 13, and the B passage connection area 16 are in communication. Therefore, if the pressure is measured at the supply port of the compressed gas, low pressure can be detected.
• Example 6 8 shows a cylinder device 60 of Example 6.
• the cylinder device 60 is a cylinder device in which the output member 6 has "low pressure” when in the raised position, “medium pressure” when in an intermediate position, and “high pressure” when in the lowered position.
• Example 6 The difference from Example 1 is the structure of the piston rod 3 of the output member 6 and the pressure detection section 2b of the housing 2. From the top, the pressure detection section 2b of Example 6 consists of the A passage connection area 15, the sliding surface area 13, the pressure loss passage connection area 17, the sliding surface area 13, and the B passage connection area 16. Unlike Example 1, it does not have the valve member area 18, nor does it have the annular valve member 10. Instead, in Example 6, the part corresponding to the annular valve member 10 is part of the housing 2.
• the piston rod 3 of Example 6 does not have the push section 12 of Example 1 on its outer periphery, but has two S seal sections 11 on the top and bottom.
• the spacing between the two S seal sections 11 is determined so that they do not simultaneously exert a sealing function between the upper and lower sliding surface areas 13. This is the difference from the cylinder device 1 of Example 1, and as the other configurations are the same, a description will be omitted.
• the seal member 11a of the upper S seal section 11 is in the A passage connection area 15, and the seal member 11a of the lower S seal section 11 is in the pressure loss passage connection area 17. Therefore, the A passage connection area 15, the sliding surface area 13, and the B passage connection area 16 are in communication. Therefore, if the pressure is measured at the compressed gas supply port, low pressure can be detected.
• Example 6 does not have a valve member region 18, nor does it have an annular valve member 10. It is possible to achieve the states of "high pressure” at the raised position, “medium pressure” at the intermediate position, and “low pressure” at the lowered position of Example 1 without using the valve member region 18 and the annular valve member 10.
• the seventh embodiment is realized without using the valve member region 18 and the annular valve member 10.
• the pressure sensing portion 2b includes, from the top, the A passage connecting region 15, the sliding surface region 13, the pressure loss passage connecting region 17, the sliding surface region 13, and the B passage connecting region 16.
• one S seal section 11 is provided on the outer periphery of the piston rod 3.
• the S seal section 11 is positioned in the lower sliding surface area 13, connecting the A passage connection area 15, the upper sliding surface area 13, and the pressure loss passage connection area 17. This makes it possible to detect the medium pressure due to the pressure loss passage Np.
• the S seal section 11 is placed in the B passage connection area 16.
• the A passage connection area 15, the upper sliding surface area 13, the pressure loss passage connection area 17, the lower sliding surface area 13, and the B passage connection area 16 are in communication. Therefore, low pressure can be detected by measuring the pressure at the compressed gas supply port.
• valve member area 18 and the annular valve member 10 are not used, which reduces the cost of the cylinder device.
• the housing 2 is provided with a supply passage (A passage Ap) that supplies compressed gas to the inside of the position detection unit 2b (hollow inner wall of the housing 2), a discharge passage (B passage Bp) that discharges the compressed gas supplied to the inside of the position detection unit 2b to the atmosphere, and a pressure loss passage Np that allows the compressed gas supplied to the inside of the position detection unit 2b to pass with a larger pressure loss than the supply passage (A passage Ap) and the discharge passage (B passage Bp) and communicates with the discharge passage (B passage Bp).
• a passage Ap that supplies compressed gas to the inside of the position detection unit 2b
• B passage Bp discharge passage
• Np a pressure loss passage that allows the compressed gas supplied to the inside of the position detection unit 2b to pass with a larger pressure loss than the supply passage (A passage Ap) and the discharge passage (B passage Bp) and communicates with the discharge passage (B passage Bp).
• the position detection unit 2b is provided with a sliding surface area 13 having an inner diameter that allows the seal member 11a to come into contact with and effectively function as a seal, and a loose insertion area 14 having a large inner diameter that does not allow the seal member 11a to function as a seal at all.
• the loose insertion area 14 is part of the A passage connection area 15, the B passage connection area 16, and the pressure loss passage connection area 17, so one loose insertion area 14 is sandwiched between two sliding surface areas 13 from above and below, and further sandwiched between the two sliding surface areas 13 by two loose insertion areas 14 above and below, respectively.
• Examples 2 and 7 are examples (hereinafter, Type 1) in which one seal member 11a is provided on the piston rod 3.
• Examples 3 and 5 are the first example (hereinafter, Type 2) in which two seal members 11a are provided on the piston rod 3.
• Examples 4 and 6 are the second example (hereinafter, Type 3) in which two seal members 11a are provided on the piston rod 3.
• the upper and lower seal members 11a are positioned simultaneously at the upper and lower sliding surface areas 13, respectively.
• the A passage connection area 15 and the pressure loss passage connection area 17 are adjacent to each other.
• the detected compressed gas pressure is "high pressure.”
• one seal member 11a cooperates with either the upper or lower sliding surface area 13 to perform a sealing function and isolates the B passage connection area 16 with the A passage connection area 15 and the pressure loss passage connection area 17 in a connected state, the detected compressed gas pressure is "medium pressure.”
• one seal member 11a cooperates with either the upper or lower sliding surface area 13 to perform a sealing function and the A passage connection area 15 and the B passage connection area 16 are in communication to isolate the pressure loss passage connection area 17, or when the upper and lower seal members 11a do not cooperate with either the upper or lower sliding surface area 13 and do not perform a sealing function, the detected compressed gas pressure becomes "low pressure.”
• the A passage connection region 15 is a supply passage that supplies compressed gas
• the A passage connection region 15, the B passage connection region 16, and the pressure loss passage connection region 17 may be arranged in any vertical arrangement, except that the A passage connection region 15 and the pressure loss passage connection region 17 are adjacent to each other.
• the B passage connection region 16 is a supply passage that supplies compressed gas
• the A passage connection region 15, the B passage connection region 16, and the pressure loss passage connection region 17 may be arranged in any vertical arrangement, except that the B passage connection region 16 and the pressure loss passage connection region 17 are adjacent to each other.
• whether the position where the seal member 11a exists in the sliding surface region 13 is the upper and lower end position, or the position where the seal member 11a exists in the loose insertion region 14 (either the A passage connection region 15, the B passage connection region 16, or the pressure loss passage connection region 17) is the upper and lower end position may be selected so that the three conditions of "high pressure”, “medium pressure", and "low pressure" can be detected.
• the A passage connection region 15, the B passage connection region 16, and the pressure loss passage connection region 17 are arranged in the same vertical order, but in the fourth embodiment, the lower seal member 11a has the lower sliding surface region 13 as its upper limit, whereas in the sixth embodiment, the lower seal member 11a has the loose insertion region 14 (pressure loss passage connection region 17) as its upper limit.
• the order in which the three conditions of "high pressure”, “medium pressure”, and “low pressure” occur in relation to the position of the piston rod 3 is different.
• the pressure loss passage connection region 17 is shown to be connected only to the B passage Bp via the pressure loss passage Np, but it may also be connected to the A passage Ap. Also, while the A passage Ap has been described as a supply passage and the B passage Bp as a discharge passage, the A passage Ap may also be a discharge passage and the B passage Bp a supply passage. Also, the pressure fluid that moves the output member 6 up and down may be a liquid such as hydraulic pressure or water, or a gas such as air or nitrogen.
• Cylinder device 2 Housing 2a Collar portion 2b Pressure detection portion 2c Cylinder portion 2d Ring surface 3 Piston rod 3a Flange portion 4 Clamp rod 4a Cam portion 4b Inclined surface 5 Slider piece 5a Cam surface 6 Output member 7 Piston 8 Spacer 8a Stop ring 9 Mount portion 9a Seat surface 9b Guide portion 9c Packing 9d Cap 10 Annular valve member 10a Upper surface 10b Groove 11 S seal section 11a Seal member 11b Ring groove 12 Push section 12a Projection portion 13 Sliding surface area 14 Loose insertion area 15 A passage connection area 16 B passage connection area 17 Pressure loss passage connection area 18 Valve member area

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• 2022
  • 2022-09-30 JP JP2022157558A patent/JP2024051404A/ja active Pending
• 2023
  • 2023-07-25 EP EP23871416.6A patent/EP4596897A1/en active Pending
  • 2023-07-25 US US19/112,484 patent/US20260098549A1/en active Pending
  • 2023-07-25 WO PCT/JP2023/027187 patent/WO2024070173A1/ja not_active Ceased

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