JPH10292803A - Slide cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage and mount a cylinder in mounting space of the same size by connecting a moving block and a driven part so that they may be freely and relatively displaced and elastically energizing the driven part in one direction of slide directions by a spring means arranged between the moving block and the driven part. SOLUTION: An engagement part 26 is erected toward a moving block 6 on the side surface on the side of the moving block 6 of a slide table 7. The pin-shaped engagement part 26 is engaged to an engagement recessed part 27 provided on the opposed surface of the moving block 6 so that the engagement part 26 may be freely and relatively displaced by a prescribed distance of the axial direction. A horizontal hole spring mounting part 28 is provided along the axial direction at the inside of the moving block 6 so that the part 28 may be communicated with the engagement recessed part 27 and a coil- shaped spring 29 as a spring means is interposed into the spring mounting means 28. The spring 29 is arranged on a work reverse side of the engagement part 26 and normally elastically energizes the whole of the slide table 7 provided with the engagement part 26 to a work forward direction via a spring reception 31 on a driven side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide cylinder which is a kind of a fluid pressure actuator, and more specifically, a displacement of a driven portion which is driven by a moving block which is a component thereof stops in the middle of an original stroke. The present invention relates to a slide cylinder having a function of absorbing an impact generated when the slide cylinder is operated.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a moving block 53 which is displaceably movable between end members 51 and 52 by the supply of fluid pressure, and a guide rail 54 provided between the end members 51 and 52. There is known a slide cylinder provided with a driven portion 55 that slides along with the displacement of the moving block 53 along which the moving block 53 and the driven portion 55 are connected by connecting bolts or click members (not shown). ) Are fixedly connected to each other.

A magnet 56 is mounted on the side surface of the moving block 53, and a sensor mounting rail 57 is provided between the end members 51 and 52 so as to face the magnet 56. A magnetic proximity sensor 58 for detecting that the moving block 53 is located at one end of the stroke (upper and lower ends in the drawing);
And a magnetic proximity sensor 59 for detecting that is located at the other end of the stroke (the upper end in the drawing).

FIG. 1 shows a moving block 53 and a driven portion 55.
Indicates a state in which the moving block 53 is displaced downward by supplying a fluid pressure to a cylinder chamber (not shown) in the moving block 53 in this state. The driven part 55 is the guide rail 54
When the moving block 53 contacts the stopper 60 attached to the one end member 51 on its lower end surface and reaches the lower end of the stroke, these displacements stop.

In the slide cylinder having the above-described structure, for example, an air chuck (not shown) is mounted on the driven portion 55, and a work (not shown) is releasably held by the air chuck.
This work is used for mounting (inserting) the work into a concave mounting portion provided on a mounting component (not shown) such as a mounting board by the above displacement. In this case, the moving block 53 and the driven portion 55 The work is mounted on the mounting part just when the lower end of the workpiece is reached.

However, when the work comes into contact with the mounting part at a position other than the mounting part due to poor positioning, the displacement of the work, the air chuck, the driven part 55 and the moving block 53 is stopped in the middle of the original stroke. . Therefore, at this time, there is a problem that the work collides with the mounted component and a large impact force is generated, thereby damaging the work or the air chuck or damaging the slide cylinder.

[0007] Conventionally, a buffering mechanism for a slide cylinder disclosed in Japanese Patent Application Laid-Open No. 7-158611 is known. In this conventional buffering mechanism, a spring as a component thereof is always provided outside a cylinder body. Since it is arranged on the outer periphery of the end of the protruding rod, the length of the slide cylinder equipped with the shock absorbing mechanism is longer than that of the slide cylinder not equipped with the shock absorbing mechanism. In addition, when the work is mounted on the mounting part of the mounting component as described above, the state where the piston is located at one end of the stroke is realized whether or not the work is correctly mounted on the mounting part. Therefore, in the magnetic proximity sensor installed to detect that the piston is located at one end of the stroke, whether or not the workpiece is accurately mounted on the mounting portion is determined. Magnetic proximity sensor that detects that the shock absorber has been actuated due to the relative displacement of the connecting member and the rod at the corresponding location of the connecting member, while the magnet is newly attached to the tip of the rod. There is a problem that must be installed.

[0008]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a moving block which is displaceable between end members by the supply of fluid pressure and which moves along a guide rail provided between the end members. Provided is a slide cylinder having a driven part that slides with a displacement of a block, the slide cylinder having a function of absorbing an impact generated when the displacement of the driven part is stopped in the middle of an original stroke. The purpose is to:

Further, even if a buffer mechanism needs to be added later (later) due to a change in specifications or modification of the equipment, the outer dimensions and mounting dimensions of the slide cylinder provided with the buffer mechanism do not increase. It is another object of the present invention to provide a slide cylinder which can be mounted on a mounting space having the same size as that of a slide cylinder having no buffer mechanism.

[0010] In addition, even if the slide cylinder is provided with a shock absorbing mechanism, a set of magnets and a magnetic proximity sensor can detect that the driven portion is located at one end of the stroke, and the work can be mounted. The purpose of the present invention is to provide a slide cylinder that also has a function of detecting whether or not it has been correctly mounted on the unit, and that does not require a new magnet and magnetic proximity sensor to obtain the latter function. I do.

[0011]

In order to achieve the above object, a slide cylinder according to a first aspect of the present invention is provided with a moving block which can move between end members so as to be able to advance and retreat between the end members by supplying a fluid pressure, and And a driven part that slides along with the displacement of the moving block along a guide rail provided therebetween, wherein the moving block and the driven part are moved relative to each other by a predetermined distance in a sliding direction of the driven part. The driven portion is elastically biased in one of its sliding directions by spring means disposed between the movable block and the driven portion so as to be displaceably connected.

A slide cylinder according to a second aspect of the present invention is the slide cylinder according to the first aspect, wherein the slide cylinder is mounted on a sensor mounting rail provided between the magnet mounted on the outer surface of the driven portion and the end member. And a magnetic proximity sensor for detecting that the driven portion is located at one end of a stroke.

In the slide cylinder according to the first aspect of the present invention having the above structure, the moving block and the driven portion are connected to each other so as to be relatively displaceable by a predetermined distance, and spring means is interposed between the two. When the work abuts on the mounting part at a place other than the mounting part when the work is mounted on the mounting part of the mounting part, the displacement of the driven part is stopped in the middle of the original stroke. The displacement continues against the elasticity of the spring means. Therefore, a buffering action can be achieved by the relative displacement against the elasticity of the spring means.

Further, since the spring means is arranged between the movable block and the driven portion which are displaceably connected to each other, the outer dimensions and the mounting dimensions of the slide cylinder provided with the buffer mechanism can be increased. Absent.

In addition, in the slide cylinder according to the second aspect of the present invention having the above-described structure, the magnet combined with the magnetic proximity sensor mounted on the sensor mounting rail bridged between the end members includes the magnet. Since the magnet and the magnetic proximity sensor are attached to the outer surface of the driven part instead of the moving block as in the prior art, the function of detecting that the driven part is located at one end of the stroke and the work It also has a function of detecting whether or not it is correctly mounted on the mounting portion. This latter function is as follows.

That is, when a workpiece held by a holding member such as an air chuck or a vacuum pad mounted on the driven portion is accurately mounted on the mounting portion, at this time, the driven portion having the magnet mounted on the outer surface is moved to one end of the stroke. The magnetic proximity sensor detects the magnetic force of the magnet and outputs a detection signal. Therefore, this detects that the driven portion is located at one end of the stroke and that the work is correctly mounted on the mounting portion. On the other hand, when a workpiece held by a holding member such as an air chuck or a vacuum pad mounted on the driven portion abuts on a mounting component at a location other than the mounting portion, the displacement of the workpiece, the holding member, and the driven portion becomes the original. Stopping in the middle of the stroke, the displacement of the magnet attached to the driven part also stops in the middle of the original stroke. Therefore, since the magnet does not operate the magnetic proximity sensor and no signal is sent from the magnetic proximity sensor even after a certain period of time, the sequencer determines that this is a mounting failure. Accordingly, the work abuts on the mounting component at a location other than the mounting portion and is not accurately mounted on the mounting portion, and as a result, it is detected that the buffer mechanism has operated to buffer.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway front view of the slide cylinder according to the embodiment, and FIG. 2 is an enlarged sectional view taken along line AA in FIG.

The slide cylinder according to this embodiment is provided with a pair of upper and lower end members 1 and 2 in the figure, and a rod 3, a guide rail 4 and a sensor mounting member are provided between the pair of end members 1 and 2. Rails 5 are erected in parallel to each other, a moving block 6 is externally displaceably inserted along the axial direction of the rod 3, and a slide table 7 as a follower of the guide rail 4 is also slidably assembled in the axial direction. I have.

A magnet (also referred to as a permanent magnet or a magnet) 8 is attached to a side surface of the slide table 7 on the side of the sensor mounting rail 5. A magnetic proximity sensor 9 for detecting that the slide table 7 is located at one end (the upper end of the drawing) and a magnetic proximity sensor 10 for detecting that the slide table 7 is located at the other end of the stroke (the upper end of the drawing). It is attached so that it can be attached and detached and the attachment position can be adjusted freely.

The rod 3 is hollow and divided into two parts in the axial direction. A piston 11 is sandwiched and supported between a pair of upper and lower divided members 3a and 3b. Divided body 3a,
3b is inserted at one end thereof into a concave portion 1a provided on the inner side surface of the end members 1 and 2, and at the other end is inserted into a concave portion 11a provided at the end surface of the piston 11. The space between the divided bodies 3a and 3b and the end members 1 and 2 is sealed by a packing 12 such as an O-ring.

A hole-shaped through portion 13 is provided in the moving block 6 along the axial direction, and a cylindrical cylinder tube 14 is inserted and fitted into the through portion 13. A closing member 15 is fitted to each end, and the rod 3 is inserted through the inner periphery of the closing member 15 so as to be relatively displaceable in the axial direction. Each of the closing members 15 is prevented from coming off by a retaining ring 16 for a hole, a gap between the cylinder tube 14 and the closing member 15 is sealed by a packing 17 such as an O-ring, and a gap between the closing member 15 and the rod 3 is fixed by a rod seal 18. The space between the piston 11 and the cylinder tube 14 is sealed by a piston seal 19.

The cylinder chamber 20 in the cylinder tube 14
Are separated by a piston 11 into a pair of upper and lower pressure chambers 21. In order to supply and discharge compressed air as fluid pressure to the pair of pressure chambers 21, piping ports 22 are respectively provided on outer surfaces of the end members 1 and 2. Is provided. The piping port 22 on the upper and lower sides of the drawing is connected to the orifice 23 and the hollow part of the divided body 3a of the rod 3 on the upper and lower sides of the drawing, so that the pressure chamber 2 on the upper and lower sides
It communicates with 1. On the other hand, an upper piping port (not shown) communicates with the upper pressure chamber 21 via the orifice and the hollow portion of the divided body 3b of the rod 3 on the upper side in the figure. Between the other ends of the divided bodies 3a and 3b of the rod 3 and the end face of the piston 11 into which the divided bodies 3a and 3b are inserted, there are provided gap-shaped flow paths 24 through which compressed air passes.

The slide table 7 is arranged so as to straddle the guide rail 4, and a concave portion (not shown) fitted with the guide rail 4 is provided on the rear surface of the slide table 4 to enable this. And guide rail 4
A pair of linear track grooves 25 are hardened and polished along the axial direction on both side surfaces and the inner surface of the concave portion facing the same, and a large number of balls (not shown) are provided in the track grooves 25. Are rotatably mounted to form a linear ball bearing (not shown). The linear ball bearing enables the slide table 7 to move relative to the guide rail 4 smoothly and accurately in the axial direction. The slide table 7 is provided with a mounting surface 7a.

A pin-like engaging portion 26 having a substantially circular cross section is provided on the side surface of the slide table 7 on the side of the moving block 6 so as to face the moving block 6. It engages with an engaging recess 27 provided on the opposing surface of the moving block 6 so as to be relatively displaceable in the axial direction by a predetermined distance. As shown in FIG. 2, the engaging recess 27 has an oval opening shape that is long in the axial direction. The stroke of the relative displacement is a range in which the engagement portion 26 comes into contact with both opening edges of the engagement recess 27 in the axial direction. Further, a notch 6a is provided on a side surface of the moving block 6 on the slide table 7 side so that the moving block 6 and the slide table 7 do not directly contact each other in the entire stroke of the relative displacement. The above-mentioned engaging recess 27 is opened on the inner surface.

A horizontal hole-shaped spring mounting portion 28 is provided in the moving block 6 along the axial direction so as to communicate with the engaging concave portion 27. The spring mounting portion 28 has a coil-like shape as a spring means. The spring 29 is inserted. The upper opening in the figure of the spring mounting portion 28 is open at the upper end face of the moving block 6, and this opening is closed here by a fixed-side spring receiver 30.
0 and the engaging portion 26, the above-described spring 29,
Further, a spring receiver 31 on the driven side is interposed.
The driven-side spring receiver 31 is slidable in the axial direction with respect to the inner surface of the spring mounting portion 28. The spring 29 is disposed above the engaging portion 26 in the figure (work backward side), and the entire slide table 7 provided with the engaging portion 26 is turned up and down (work forward direction) through a spring receiver 31 on the driven side.
Is always elastically biased.

A stopper receiver 32 is provided on each of the upper and lower end surfaces of the moving block 6, and a stopper or a shock absorber 33 is attached to each of the end members 1 and 2 so as to face the stopper receiver 32.

Next, the operation of the slide cylinder having the above configuration will be described.

When a work (not shown) is mounted (inserted) on a mounting part of a mounting part (not shown) using the slide cylinder, the mounting surface 7 of the slide table 7 is used.
An air chuck (not shown) as a holding member is mounted on a, and the work held releasably by the air chuck is directly opposed to the hole-shaped or concave-shaped mounting portion of the mounting component. In the state of FIG. 1 which is the initial movement posture, the moving block 6 is positioned at the upper end of the stroke, and the slide table 7 is moved by the elasticity of the spring 29 and its own weight.
Is located at the lower end of the stroke relative to.

In the state shown in FIG. 1, when the compressed air is supplied to the lower pressure chamber 21 and the compressed air is discharged from the upper pressure chamber 21, the moving block 6 is displaced downward. The slide table 7, which has the spring receivers 30, 31, the engagement portion 26, the air chuck, and the work are displaced downward without changing the relative positional relationship with respect to the moving block 6. As shown in FIG. 3, the moving block 6 comes into contact with the shock absorber 33 at the stopper receiver 32 attached to the lower end surface thereof. Stops,
At this time, the work is mounted on the mounting section. When the work is correctly mounted on the mounting portion, the magnetic proximity sensor 9 senses the magnetic field of the magnet 8 mounted on the side surface of the slide table 7 and sends a mounting completion signal to the outside.
The holding of the air chuck is released, and the mounting operation is completed.

On the other hand, when the positioning failure of the slide cylinder itself occurs, the work is not mounted on the mounting portion but comes into contact with the mounted component at a portion other than the mounting portion. At this time, the engaging portion 26 is engaged with the moving block 6 so as to be displaceable by a predetermined distance in the axial direction, and the air chuck and the slide table 7 holding the work abut the work on the mounting part at a position other than the mounting portion. It is held in the state where it was done.

On the other hand, as shown in FIG. 4, the movable block 6 descends to the original lower end of the stroke against the elasticity of the spring 29, so that even if the work comes into contact with the mounted part at a place other than the mounted part. The load acting on the work is absorbed, and it is possible to reliably prevent the work, the air chuck, and the slide cylinder itself from causing a problem.

At this time, since the slide table 7 has not been lowered to the original lower end of the stroke, the magnet 8 does not operate the magnetic proximity sensor 9 and a signal is output from the magnetic proximity sensor 9 even after a certain period of time. It is not sent, and the sequencer determines that this is a mounting failure, and the next operation corresponding to the mounting failure is automatically started. Therefore, this set of magnets 8
And the magnetic proximity sensor 9 has both a function of detecting that the slide table 7 is positioned at one end of the stroke and a function of detecting whether or not the work is correctly mounted on the mounting portion. There is no need to install new magnets and magnetic proximity sensors to obtain the function.

In this slide cylinder, a buffer mechanism 41 is provided on the slide cylinder, since the engaging portion 26 erected on the slide table 7, the spring 29, and the spring receivers 30 and 31 are incorporated inside the moving block 6. However, the outer dimensions and the mounting dimensions of the slide cylinder are not increased, so that the slide cylinder with the buffer mechanism 41 can be exchangeably mounted in a mounting space of the same size as the slide cylinder without the buffer mechanism. There are advantages.

The shock absorbing mechanism 41 described in the above embodiment can be incorporated in a rodless type cylinder as shown in FIG.

That is, the rodless type slide cylinder shown in FIG. 5 supplies compressed air to the inside of a cylinder tube 34 provided between a pair of end members 1 and 2,
The piston 35 provided with the plurality of magnets 36 is reciprocated, the magnetic block of the magnetic material is driven by the magnetic force of the magnets 36, and the slide table 7 is slid accordingly.

In each of the above-described embodiments, a pin-shaped engaging portion 26 is provided upright on the slide table 7, and the engaging portion 26 is
7 is engaged with the movable block 6 so as to be relatively displaceable in the axial direction. Conversely, the engaging portion 26 is provided upright on the moving block 6 and the engaging recess 27 is provided on the slide table (driven portion) 7. May be. In the latter case, the spring (spring means) 29 is also disposed on the slide table (follower) 7 side. Furthermore, the engaging portion 26 and the engaging concave portion 2
It is also conceivable to directly interpose a spring (spring means) 29 between the moving block 6 and the slide table (driven portion) 7 without providing the.

[0038]

The present invention has the following effects.

That is, in the slide cylinder according to the first aspect of the present invention having the above structure, the moving block and the driven portion are connected to each other so as to be relatively displaceable by a predetermined distance, and a spring means is interposed between the two. Therefore, it is possible to exert a buffering action by the relative displacement of the two against the elasticity of the spring means. Therefore, for example, when the work is mounted on the mounting part of the mounting component as described above, the workpiece abuts on the mounting component at a location other than the mounting portion, and the displacement of the driven portion is stopped in the middle of the original stroke. Even so, it is possible to prevent the holding member such as the work, the air chuck or the vacuum pad or the slide cylinder from being damaged by the impact.

Further, since the spring means is arranged between the movable block and the driven portion which are displaceably connected to each other, the outer dimensions and the mounting dimensions of the slide cylinder provided with the buffer mechanism can be increased. Therefore, the slide cylinder with the buffer mechanism can be exchangeably mounted in the mounting space of the same size as the slide cylinder without the buffer mechanism.

In addition to the above, in the slide cylinder according to the second aspect of the present invention having the above-described structure, the magnet combined with the magnetic proximity sensor mounted on the sensor mounting rail provided between the end members is the same as the above. Since the magnet and the magnetic proximity sensor are attached to the outer surface of the driven part instead of the moving block as in the prior art, the function of detecting that the driven part is located at one end of the stroke and the work It also has a function of detecting whether or not it is correctly mounted on the mounting portion. Therefore, it is not necessary to newly install a magnet and a magnetic proximity sensor in order to secure the latter function.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a slide cylinder according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a partially cutaway front view showing an operation state of the slide cylinder.

FIG. 4 is a partially cutaway front view showing an operation state of the slide cylinder.

FIG. 5 is a partially cutaway front view of a slide cylinder according to another embodiment of the present invention.

FIG. 6 is a front view of a conventional slide cylinder.

[Explanation of symbols]

 1, 2 end member 1a, 11a recess 3 rod 3a, 3b divided body 4 guide rail 5 sensor mounting rail 6 moving block 6a notch 7 slide table (follower) 7a mounting surface 8, 36 magnet 9, 10 magnetic proximity sensor 11, 35 Piston 12, 17 Packing 13 Penetration part 14, 34 Cylinder tube 15 Closing member 16 Retaining ring for hole 18 Rod seal 19 Piston seal 20 Cylinder chamber 21 Pressure chamber 22 Piping port 23 Orifice 24 Flow path 25 Track groove 26 Engagement Part 27 Engagement concave part 28 Spring mounting part 29 Spring (spring means) 30, 31 Spring receiver 32 Stopper receiver 33 Shock absorber 41 Buffer mechanism

Claims (2)

[Claims] The end members (1) and (2) are supplied with fluid pressure.
A movable block (6) displaceable between the end members (1) and (2) and a guide rail (4) installed between the end members (1) and (2).
And a driven part (7) that slides along with the displacement of the moving block (6), wherein the moving block (6) and the driven part (7) are connected to the driven part (7). ) Is connected to the slide direction in the slide direction by a predetermined distance, and the driven unit (7) is moved in the slide direction by a spring means (29) disposed between the moving block (6) and the driven unit (7). A slide cylinder characterized by being elastically biased to one side. 2. The sensor mounting rail (5) according to claim 1, wherein the magnet (8) mounted on the outer surface of the driven portion (7) and the end members (1) and (2). A magnetic proximity sensor (9) attached to the slider and detecting that the driven portion (7) is positioned at one end of a stroke.