JP2019074117A - Fluid pressure cylinder device - Google Patents

Abstract

To provide a fluid pressure cylinder device capable of adjusting a detection position of an air pressure change in the case of position detection of a stroke.SOLUTION: The present invention relates to a fluid pressure cylinder device in which one end of a cylinder chamber 2 that is formed in a cylinder trunk 1 is closed by a head-side end portion 3 and the other end is closed by a cap-side end portion 4. A piston rod 6 protruding from a piston 5 which is accommodated in the cylinder chamber 2 protrudes from the head-side end portion 3, a deep hole 9 toward a side of the piston rod is provided in the piston 5, and a position detection rod 10 which is inserted into the deep hole 9 is provided in the cap-side end portion 4. The position detection rod 10 includes an air passage 11 and a valve body 12 which opens/closes the air passage 11. Relative positions of the deep hole 9 and the position detection rod 10 are detected and the valve body 12 is moved, thereby opening/closing the air passage 11. In the fluid pressure cylinder device, a position adjusting device 32 is provided for freely adjusting a position of the position detection rod 10 in an axial center direction with respect to the cap-side end portion 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid pressure cylinder device provided with a stroke position detection device.

  What was described in following patent documents 1-4 is proposed as a fluid pressure cylinder apparatus provided with the stroke position detection apparatus.

  The one described in Patent Document 1 is provided with a simple configuration and an inexpensive stroke end detection function provided in a cylinder device, and a mechanism capable of adjusting the detection position thereof is built in. A deep hole is formed in the axial direction from the rear end face side of the piston rod, and an annular magnet is attached to a predetermined position on the inner peripheral surface of the deep hole, and the protective tube (nonmagnetic material) of the detection unit is the deep hole from the head cover side. The pipe (non-magnetic material) with the reed switch inserted and supported inside the protective tube is supported and inserted, and each reed switch corresponds to the position of the annular magnet at each stroke end Although attached, the position adjustment can be performed by moving the pipe in the front-rear direction by the adjustment mechanism built in the mechanism chamber of the detection unit.

  According to Patent Document 2, it is possible to reliably detect that the output member has reached a predetermined position through a pressure change of the air pressure in the air passage in the clamp main body, and it can be miniaturized with excellent reliability and durability. An object of the present invention is to provide a fluid pressure cylinder and a clamp device, and an air passage formed in a cylinder body of a hydraulic cylinder, supplied with pressurized air at one end and communicated with the other end at the other end. The on-off valve mechanism is mounted so as to be able to move forward and backward, and has a valve body whose tip end projects into the hydraulic chamber, a valve seat on which the valve body can come in contact, and a hydraulic chamber When the output member reaches a predetermined position, it has a hydraulic introduction chamber that holds the valve body in an advanced state toward the output member by hydraulic pressure, and a hydraulic introduction passage that brings the hydraulic chamber and the hydraulic introduction chamber into communication. Move the valve by the output member and open / close valve mechanism Switched-off state, the output member via the air pressure of the air passage were those detectable constructed that has reached a predetermined position.

  The object of Patent Document 3 is to provide a swing type clamp device capable of detecting that a piston member has moved to a preset movement position through a fluid pressure, and an auxiliary rod And a fluid passage formed in the head side end wall member and the auxiliary rod and opened and closed by the detection on-off valve mechanism, the detection on-off valve mechanism comprising a tip end side portion of the auxiliary rod A valve body accommodation hole formed in the valve body, a valve body movably accommodated in the valve body accommodation hole and having an engagement recess in an outer peripheral portion, and a ball movably mounted on the auxiliary rod and engageable with the engagement recess And when the piston member reaches a preset movement position, the valve body is switched to the valve closing position or the valve opening position by the cooperation of the ball, the engagement recess and the inner peripheral wall portion of the rod insertion hole. Was configured.

  The object of Patent Document 4 is to provide a clamp device capable of reliably detecting both the unclamping position and the clamping position without increasing the size of the clamp body, and having a hydraulic cylinder. In a clamp device, a rod insertion hole formed in a piston member, an auxiliary rod provided in a cylinder hole so as to project from a head side end wall member of a cylinder body and insertable into the rod insertion hole, a head side end wall member And first and second pressurized air passages formed in the auxiliary rod, a first on-off valve mechanism for opening and closing an intermediate portion of the first pressurized air passage, and an opening and closing an intermediate portion of the second pressurized air passage A second on-off valve mechanism is provided, the first on-off valve mechanism is closed or opened only in the unclamped state, and the second on-off valve mechanism is closed or opened only in the clamped state; 1, 2nd on-off valve machine The were those incorporated coaxially head-side end wall member and the auxiliary rod.

JP 2000-329112 A JP, 2013-82025, A JP, 2014-108490, A JP, 2015-20221, A

  The prior art described in Patent Document 1 is capable of changing the detection position by the adjustment mechanism of the detection unit, but since the detection unit is an electrical switch, wiring at the time of replacing the mold and cylinder At the time of disconnecting the connector part, disconnection and connection failure occur, resulting in a problem that an operation failure occurs. In addition, there is a problem that the life of the electrical switch is short. Furthermore, since there is no rigidity of the detection unit, there is a problem that it is weak to vibration and the like and a failure is likely to occur.

  On the other hand, since the conventional ones described in Patent Documents 2 to 4 detect the pressure change of the air pressure, the problem of the electrical switch does not occur, but the position to be detected of the output member is fixed. And there is a problem that the detection position can not be adjusted.

  That is, the cylinder is not used at the stroke end of the piston rod (the position at which the piston abuts on the cylinder end and stops) and stops at the opposite side at a position slightly before the stroke end. Due to the variation in position in the opposite direction, the operation stop position of the piston rod varies. If position detection of the stroke position detection device is fixed, a detection device matched to the stop position is required.

  Then, this invention aims at providing the fluid pressure cylinder apparatus which can adjust a detection position in what detects the position of a stroke by the change of air pressure.

  In order to achieve the above object, the present invention takes the following measures. That is, in the fluid pressure cylinder device of the present invention, one end of the cylinder chamber formed in the cylinder body is closed at the head end, the other end is closed at the cap end, and the cylinder is housed in the cylinder chamber. A piston rod protruding from the piston projects from the head end, and the piston is provided with a deep hole toward the piston rod, and a position detection rod inserted into the deep hole is provided at the cap end An air passage and a valve body for opening and closing the air passage are provided in the position detection rod, the relative position between the deep hole and the position detection rod is detected to move the valve body to open and close the air passage. In the fluid pressure cylinder device configured to be configured as described above, there is provided a position adjustment device that can adjust the position of the position detection rod in the axial direction with respect to the cap side end.

  The position adjusting device includes a flange portion provided at an end portion of the position detection rod, a reinforcement bolt screwed to the flange portion to adjust the position of the cap side end portion, and the flange portion as the cap It is preferable to have a fixing bolt fixed to the side end.

  The position adjusting device includes an external thread provided at an end of the position detection rod, an internal thread provided at the end on the cap side and engaged with the external thread, and an external thread engaged with the external thread. A lock nut may be assembled to fix the position detection rod to the cap end.

  An air supply pipe forming the air passage is inserted into the position detection rod, and a tip of the air supply pipe is a valve seat that is opened and closed by the valve body, and an air from an air supply source is supplied to the air supply pipe. It is preferable that an air pipe for supplying air is connected, an air pressure detection device is provided in the air pipe, and an air exhaust port for exhausting air leaking from the valve seat is provided in the position detection rod.

  The position detection rod is formed with a fluid pressure introducing passage for introducing a fluid for urging the valve body in the valve closing direction, and the fluid pressure introducing passage is formed between the piston and the cap side end. Preferably, it is configured to introduce the fluid supplied to the cylinder chamber.

  A position detection recess is provided on the inner peripheral surface of the deep hole, a tapered surface is provided on the valve body so as to expand in diameter toward the head side, and a ball movable in the radial direction of the rod is provided on the position detection rod. The ball contacts the inner peripheral surface of the deep hole and engages with the tapered surface, whereby the valve body opens the air passage and the ball is in the position detection recess; Preferably, the valve body is configured to close the air passage by disengaging the surface.

  Preferably, the position detection recess is provided at a position for detecting the advanced position of the piston rod.

  ADVANTAGE OF THE INVENTION According to this invention, in what detects a stroke position by the change of an air pressure, adjustment of a detection position became possible, and versatility was improved.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention, showing a retracted position (non-operating position) of a piston rod. The figure which shows the advancing position (working position) of a piston rod in the thing of FIG. The enlarged view which shows the J section of FIG. The enlarged view which shows the L section of FIG. The enlarged view which shows the K section of FIG. The enlarged view which shows the M section of FIG. FIG. 7 is a cross-sectional view showing a second embodiment of the present invention, showing a retracted position of a piston rod. The figure which shows the advancing position of a piston rod in the thing of FIG.

Hereinafter, embodiments of the present invention will be described based on the drawings.
What is shown in FIGS. 1 to 6 is a first embodiment.
In FIG. 1, the fluid pressure cylinder device has a cylinder body 1. One end of the cylinder chamber 2 formed in the cylinder body 1 is closed by the head end 3, and the other end is closed by the cap end 4. A piston 5 is accommodated in the cylinder chamber 2. A piston rod 6 protruding from the piston 5 protrudes from the head end 3. (Hereinafter, when indicating directionality, the "head side" means the direction in which the piston rod 6 protrudes, and the "cap side" means the opposite direction.)

  The cylinder chamber 2 is divided into a head side chamber 2 a and a cap side chamber 2 b via the piston 5. A first fluid port 7 for supplying or discharging pressure fluid to or from the head side chamber 2 a is provided at the head side end 3. A second fluid port 8 for supplying or discharging the pressure fluid to the cap side chamber 2 b is provided at the cap side end 4. In the present embodiment, the pressure fluid is hydraulic pressure, but is not limited thereto.

  The piston 5 is provided with a deep hole 9 directed to the piston rod side. A position detection rod 10 inserted into the deep hole 9 is provided at the cap side end 4. The position detection rod 10 is provided with an air passage 11 and a valve 12 for opening and closing the air passage 11. The relative position between the deep hole 9 and the position detection rod 10 is detected, and the valve body 12 is moved to open and close the air passage 11. That is, a position detection recess 13 is provided midway in the axial center direction of the deep hole 9, and the position detection rod 10 detects the position detection recess 13, whereby the stroke position of the piston rod 6 is detected. .

  In FIG. 1, the piston rod 6 is in the retracted position, and the piston 5 abuts on the cap end 4 and is in the non-operating state.

  In FIG. 2, the piston rod 6 is in the advanced position and in the operating state. In this operating state, the piston 5 is not in contact with the head end 3 and has a predetermined gap. For example, when used as a lock device for pressing and fixing a work on the tip end side of the piston rod, the piston 5 has a gap of about 5 mm with the head end 3 to apply a pressing force to the work . The present invention detects this operating position, but the lock position differs depending on the work, and the lock position differs depending on wear and the like of the same work.

  Since the fluid pressure cylinder device provided with the conventional air pressure detection type stroke detection device was fixed in the detection position, it had to be a dedicated item corresponding to the work. For example, in the case of a lock device for fixing a mold, it has been necessary to replace the hydraulic cylinder device each time the mold is changed. In this embodiment, the detection position can be adjusted without replacing the hydraulic cylinder device.

  The position detection rod 10 has a rod portion 14 and a flange portion 15 formed at the end of the rod portion 14 on the cap side. The flange portion 15 is located on the surface side of the cap side end 4. The rod portion 14 is inserted into a rod insertion hole 16 provided at the center of the cap side end portion 4, and the tip portion thereof is inserted into the deep hole 9 of the piston rod 6.

  A through hole 17 is formed in the center of the position detection rod 10 from the flange portion 15 to the rod portion 14. An air piping connection portion 18 is provided in the through hole 17 of the flange portion 15. The air pipe connection portion 18 is provided with a hollow air supply pipe 19. A predetermined gap is formed between the outer peripheral surface of the air supply pipe 19 and the inner peripheral surface of the through hole 17. The gap and the hollow portion of the air supply pipe 19 form the air passage 11. The tip end of the air supply pipe 19 on the head side is an air jet port, and is a valve seat 20 which is opened and closed by the valve body 12.

  An air pipe 22 for supplying air from the air supply source 21 is connected to the air pipe connection portion 18. An air pressure detection device 23 is provided in the middle of the air pipe 22.

  Of the air passage 11, a portion formed by a gap between the inner peripheral surface of the through hole 17 and the outer peripheral surface of the air supply pipe 19 is an exhaust air passage, and the air exhaust port 24 provided in the flange portion 15. It is open to the atmosphere.

  As shown in FIGS. 3 and 4, the valve body 12 is accommodated in the through hole 17 at the tip end portion of the rod portion 14 of the position detection rod 10 so as to be movable in the axial direction. The lower end (end on the cap side) of the valve body 12 abuts on the valve seat 20 to open and close the air jet port. Therefore, the lower end surface of the valve body 12 is a valve surface 25 that allows the valve seat 20 at the tip of the air supply pipe 19 to be opened and closed.

  The position detection rod 10 is formed with a fluid pressure introducing passage 26 for introducing a fluid that biases the valve body 12 in the valve closing direction. The fluid pressure introducing passage 26 is configured to introduce the fluid supplied to the cylinder chamber 2 b between the piston 5 and the cap side end 4. That is, since the rod portion 14 is inserted into the deep hole 9 of the piston rod 6 with a predetermined gap, the pressure oil of the cap side chamber 2b is introduced into this gap, and the through hole in the tip portion of the rod portion 14 It is configured to act on the valve body 17 to press the valve body 12. Therefore, the top (end on the head side) of the valve body 12 is a pressure receiving surface of pressure oil. A seal member 27 is provided between the valve body 12 and the through hole 17 so that the pressure oil acting on the top of the valve body 12 does not enter the gap between the valve body 12 and the through hole 17 and reach the air supply pipe 19. ing.

  The position detection rod 10 is provided with an elastic member 28 for urging the valve body 12 in the valve closing direction. In the present embodiment, the elastic member 28 is a coil spring whose one end is engaged with the end of the rod portion 14 and whose other end abuts on the top of the valve body 12. However, the elastic member 28 is not limited to this. The elastic member 28 promotes the biasing force of the valve body 12 by the pressure oil, and is not necessarily essential.

  The valve body 12 is provided with a tapered surface 29 whose diameter increases toward the head side.

  A plurality of spherical body holding holes 30, which communicate the through holes 17 and the outer peripheral portion in the radial direction, are provided in a plurality at circumferentially regular intervals in the tip end portion of the rod portion 14 of the position detection rod 10. A ball 31 movable in the radial direction of the rod portion 14 is provided in the hole 30.

  As shown in FIGS. 1 and 3, the valve body 12 is pressed to the head side by the spherical body 31 coming into contact with the inner peripheral surface of the deep hole 9 and engaging with the tapered surface 29, and the valve surface of the valve body 12 The contact of the air supply pipe 19 with the valve seat 20 is released, and the air passage 11 is opened.

  As shown in FIGS. 2 and 4, when the ball 12 is in the position detecting recess 13, the ball 31 is disengaged from the tapered surface 29 and the valve body 12 is configured to close the air passage 11. There is. That is, when the pressing of the spherical body 12 to the head side is released, the valve member 12 abuts against the valve seat 20 of the air supply pipe 19 by the elastic member 28 and the hydraulic pressure, and closes the air jet port.

  In the present embodiment, the position detection recess 13 is provided at a position for detecting the advanced position of the piston rod 6, but the present invention is not limited to this. For example, the position of the middle between the advanced position and the retracted position may be detected.

  There is provided a position adjusting device 32 which can adjust the position of the position detection rod 10 in the axial direction with respect to the cap side end 4.

  The position adjusting device 32 includes a flange portion 15 provided at an end portion of the position detection rod 14, a shear bolt 33 screwed with the flange portion 15 to adjust the position of the cap side end portion 4, and the flange portion 15. And a fixing bolt 34 for fixing the cap 4 to the cap end 4. A plurality of gore bolts 33 and fixing bolts 34 are provided at equal intervals in the circumferential direction on the same circumference. The position of the position detection rod 10 with respect to the cap side end 4 is adjusted by turning the attachment bolt 33, and the position detection rod 10 is fixed to the cap side end 4 by tightening the fixing bolt 34.

  For example, in the lock position (operation position) shown in FIGS. 2 and 4, even when the lock position is shifted due to mold replacement and the position can not be detected, the lock position can be adjusted by the position adjusting device 32.

  The position detection rod 10 constitutes an operation position detection device 35 as a stroke position detection device. Apart from the actuating position detecting device 35, a non-actuating position detecting device 36 of the piston rod 6 is provided at the cap side end 4.

  5 and 6 are enlarged cross-sectional views of the non-operating position detection device 36. FIG. At the cap side end 4, mounting holes 37 at both ends are provided with an axial center parallel to the cylinder axial direction. The cap side portion of the mounting hole 37 is closed by the cap member 38. The head side portion of the mounting hole 37 is closed by a valve member 39. The valve member 39 is provided movably in the cylinder axial direction. The head side end of the valve member 39 projects in and out of the cylinder chamber 2b.

  A fluid pressure introducing chamber 40 is formed between the cap side end of the valve member 39 and the head side end of the cap member 38. The valve member 39 is provided with an introduction passage 41 for introducing the fluid pressure of the cylinder chamber 2 b into the fluid pressure introduction chamber 40. The fluid pressure in the cylinder chamber 2b is introduced into the fluid pressure introduction chamber 40 via the introduction passage 41, so that the valve member 39 is always biased so that the tip thereof protrudes into the cylinder chamber 2b.

  A valve chamber 42 is provided between the valve member 39 and the cap member 38. The valve chamber 42 and the fluid pressure introducing chamber 40 are sealed by a sealing member 43 to maintain airtightness.

  The cap side end 4 is provided with an air piping connection port 44, and the connection port 44 and the valve chamber 42 communicate with each other via an air passage. The cap member 38 is provided with an air exhaust port 46 for releasing the atmosphere, and the exhaust port 46 is in communication with the valve chamber 42 via the air passage 45. The air passage 45 of the cap member 38 is freely opened and closed by the valve member 39 in the valve chamber 42.

  As shown in FIG. 1, a second air pipe 47 for supplying air from the air supply source 21 is connected to the air pipe connection port 44. A second air pressure detection device 48 is provided in the middle of the air piping.

The operation of the first embodiment of the above configuration will be described.
The inoperative position of the piston rod 6 shown in FIGS. 1, 3 and 5 will be described.
In FIG. 5, the piston 5 abuts on the tip end of the valve member 39 of the inoperative position detecting device 36 to move the valve member 39, and closes the air passage 45 between the valve member 39 and the cap member 38 in the valve chamber 42. The second air pressure detection device 48 detects an increase in the air pressure of the second air pipe 47 by closing the air passage 45, and turns on to know that the piston rod 6 has reached the non-operating position. it can.

  As shown in FIG. 3, the tip of the position detection rod 10 of the operation position detection device 35 is located at the back of the deep hole 9. Since the spherical body 31 is in contact with the inner peripheral surface of the deep hole 9, the tapered surface 29 of the valve body 20 is brought into pressure contact, and the valve body 20 is pressed to the head side. The fluid pressure in the cylinder chamber acts on the top surface of the valve body 20 via the fluid pressure introducing passage 26, and the valve body 12 is pressed to the cap side by the biasing force of the elastic member 28. In this state, a gap is generated between the valve face 25 at the end of the valve body 12 and the valve seat 20 at the end of the air supply pipe 19.

  The air supplied from the air supply source 21 to the air supply pipe 19 via the air pipe 22 leaks from the gap, passes through the exhaust air passage, and is released from the air exhaust port 24 to the atmosphere. Therefore, in the air detection device 23 provided in the air pipe 22, the air pressure does not increase, and the detection is in the off state.

  The operating positions of FIGS. 2, 4 and 6 will be described. A position where fluid pressure is supplied to the cap side chamber 2b, the piston rod 6 moves to the advancing side, and a work is fixed, that is, a position slightly before the piston 5 abuts on the head side end 3 is taken as an operating position. There is.

  As shown in FIG. 4, in this operation position, the tip of the position detection rod 10 of the operation position detection device 35 is located in the position detection recess 13 formed in the deep hole 9. The sphere 31 in contact with the inner peripheral surface of the deep hole 9 moves into the position detection recess 13 at this position. That is, since the top of the valve body 12 is urged toward the cap by the fluid pressure and the elastic member 28, the spherical body 31 is pressed by the tapered surface 29 and pushed into the recess 13. As a result, the valve body 12 moves to the cap side, and the valve surface 25 at the tip of the valve body 12 closes the valve seat 20 of the air supply pipe 19.

  By closing the air passage 11, the air pressure of the air pipe 22 is increased, and the air detection device 23 detects that it is turned on to notify that the working position has been reached.

  As shown in FIG. 6, the valve member 39 of the non-operating position detection device 36 releases the pressure of the piston 5, and the valve member 39 is pressed toward the head by the fluid pressure of the fluid pressure introducing chamber 40. And the air passage 45 between the valve member 39 and the cap member 38 is opened. Since the air passage 45 is opened and released to the atmosphere from the air exhaust port 46, the second air pressure detection device 48 can detect a pressure decrease to know that it is in the off state and not in the inoperative state.

  In such a fluid pressure cylinder device, since the position detection rod 10 is provided so as to be positionally adjustable in the axial direction with respect to the cap side end 4 by the position adjustment device 32, the operating position of the piston rod 6 changes. However, the position adjusting device 32 can make the operating position accurate.

  That is, although the operating position is shown, when the position shown in FIG. 4 is shifted and the ball 31 is not positioned in the position detection recess 13, the fixing bolt 34 is loosened and the bending bolt 33 is turned to detect the position of the ball 31 It is adjusted to be located in the recess 13. The air detection means 23 can detect whether or not the sphere 31 is located in the position detection recess 13. When the position adjustment is completed, the fixing bolt 34 is tightened to fix the position detection rod 10 to the cap end 4.

  What is shown in FIGS. 7 and 8 is a second embodiment. The position adjustment device 32 is different from that of the first embodiment.

  The position adjusting device 32 of this embodiment includes an external thread 49 provided at the end of the position detection rod 10 and an internal thread 50 provided at the cap end 4 and screwed with the external thread 49. And a lock nut 51 screwed to the male screw 49 to fix the position detection rod 10 to the cap end 4.

  In the operation position, when the ball 31 is not positioned in the position detection recess 13 and the operation position can not be detected, the position adjustment of the position detection rod 10 loosens the lock nut 51 and rotates the position detection rod 10 to rotate the male thread By adjusting the relative position between 49 and the female screw 50, the ball 31 is adjusted to be positioned in the position detection recess 13. Thereafter, the lock nut 51 is tightened.

  The other configuration is the same as that of the first embodiment, and therefore the description thereof is incorporated.

  The form of the embodiment disclosed this time is illustrative in all points and not restrictive. The scope of the present invention is indicated not by the above description but by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

Reference Signs List 1 cylinder body 2 cylinder chamber 3 head side end 4 cap side end 5 piston 6 piston rod 7 first fluid port 8 second fluid port 9 deep hole 10 position detection rod 11 air passage 12 valve body 13 position detection recess 14 Rod portion 15 Flange portion 16 Rod insertion hole 17 Through hole 18 Air piping connection portion 19 Air supply pipe 20 Valve seat 21 Air supply source 22 Air piping 23 Air pressure detection device 24 Air exhaust port 25 Valve surface 26 Fluid pressure introducing passage 27 Seal Member 28 Elastic member 29 Taper surface 30 Sphere holding hole 31 Sphere 32 Position adjustment device 33 Suspension bolt 34 Fixing bolt 35 Operation position detection device 36 Non-operation position detection device 37 Mounting hole 38 Cap part 39 Valve member 40 Fluid pressure introduction chamber 41 Introduction Passage 42 Valve chamber 43 Seal member 44 Air piping connection port 45 Air passage 46 Air Exhaust port 47 Second air piping 48 Second air pressure detection device 49 Male thread 50 Female thread 51 Lock nut

Claims (7)

One end of the cylinder chamber formed in the cylinder body is closed at the head end and the other end is closed at the cap end, and the piston rod protruding from the piston housed in the cylinder chamber is on the head side The piston is provided with a deep hole projecting from the end and directed to the piston rod side, and a position detection rod inserted into the deep hole is provided at the cap side end, and the air passage and the air are provided in the position detection rod. A fluid pressure cylinder device provided with a valve body for opening and closing a passage, detecting a relative position between the deep hole and the position detection rod to move the valve body to open and close the air passage,
A fluid pressure cylinder device provided with a position adjusting device which can adjust the position of the position detecting rod in the axial direction with respect to the cap side end.   The position adjusting device includes a flange portion provided at an end portion of the position detection rod, a reinforcement bolt screwed to the flange portion to adjust the position of the cap side end portion, and the flange portion as the cap The fluid pressure cylinder device according to claim 1, further comprising: a fixing bolt fixed to the side end.   The position adjusting device includes an external thread provided at an end of the position detection rod, an internal thread provided at the end on the cap side and engaged with the external thread, and an external thread engaged with the external thread. The fluid pressure cylinder device according to claim 1, further comprising: a lock nut assembled to fix the position detection rod to the cap end. An air supply pipe forming the air passage is inserted into the position detection rod, and a tip of the air supply pipe is a valve seat that is opened and closed by the valve body, and an air from an air supply source is supplied to the air supply pipe. Connected to the air pipe for supplying the air pressure, and the air pipe is provided with an air pressure detecting device,
The fluid pressure cylinder device according to claim 2 or 3, wherein the position detection rod is provided with an air exhaust port for exhausting air leaking from the valve seat.   The position detection rod is formed with a fluid pressure introducing passage for introducing a fluid for urging the valve body in the valve closing direction, and the fluid pressure introducing passage is formed between the piston and the cap side end. The fluid pressure cylinder device according to claim 4, which is configured to introduce the fluid supplied to the cylinder chamber. A position detection recess is provided on the inner circumferential surface of the deep hole,
The valve body is provided with a tapered surface whose diameter increases toward the head side,
The position detection rod is provided with a sphere movable in the radial direction of the rod;
The valve body opens the air passage by the sphere contacting the inner circumferential surface of the deep hole and engaging with the tapered surface.
The fluid according to any one of claims 1 to 5, wherein when the ball is in the position detection recess, engagement with the tapered surface is released so that the valve body closes the air passage. Pressure cylinder device.   The fluid pressure cylinder device according to claim 6, wherein the position detection recess is provided at a position for detecting an advanced position of the piston rod.

Images