JPH09170605A - Rodless cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a barrel guide a mount smoothly by restraining the deformation of a cylinder barrel side wall. SOLUTION: When a downward big load acts on the upper surface of a mount 34, the load is caught as the force of the perpendicular direction to nearly slit width direction by horizontal guide rails 23, 23. Thereby, the bending stress of the slit width direction hardly acts on the side wall and the deformation amount to the slit width direction of both side walls becomes smaller extremely and the deformation of the guide rail installed on the side wall can be restrained and the mounted 34 guided thereby can be moved smoothly.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rodless cylinder.

[0002]

2. Description of the Related Art As a conventional rodless cylinder of this type, as shown in Japanese Unexamined Patent Publication No. 58-50302, V-shaped guide grooves are provided on the side surfaces of a cylinder barrel, and these guide grooves are provided. In some cases, the mount is provided with a V-shaped guide portion that is guided by the guide, and these guide portions are guided straight in the axial direction by the guide groove.

[0003]

In the conventional rodless cylinder described above, when a large load is applied to the upper surface of the mount, the guide portions on both sides push the lower slopes of the guide grooves to deform both side walls inward. However, there is a problem that the guide accuracy of the guide groove is lowered and the movement of the mount guided by the guide groove is not smooth.

[0004]

In order to solve the above-mentioned problems, the present invention fits a piston in a sliding hole of a cylinder barrel having a slit long in the axial direction in a part of a peripheral wall, and the piston is fitted into the sliding hole. In the rodless cylinder formed by projecting the connecting portion provided to the outside from the slit, connecting the mount to the connecting portion, and sealing the slit with a seal band, when the slit of the cylinder barrel is directed upward, Horizontal guide rails having substantially horizontal guide surfaces on the upper side with the slit facing upward are provided on both side walls located on both the left and right sides of the slit.
Each of them is provided with an inclined guide rail having an inclined downwardly inclined guide surface with respect to the horizontal guide rail, and the mount is provided with guides for the horizontal guide rail on both sides of the connecting portion. It is characterized in that a guide portion guided to the surface and a guide portion guided to the guide surface of the inclined guide rail are provided respectively.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 is a cylinder barrel made of a non-magnetic material such as an aluminum material, which is formed in a substantially quadrangular cross section. In this cylinder barrel 1, reference numeral 2 denotes a sliding hole, and reference numeral 3 denotes a slit formed in the upper wall, which is formed over the entire length in the axial direction. Next, reference numeral 4 denotes end caps which are fixed to both ends of the cylinder barrel 1 with mounting bolts 5 respectively, and have supply / discharge holes 6 for supplying / discharging compressed air. Reference numeral 7 denotes a seal band on the inner side for closing the slit 3, which is formed by a magnetic material to have a width larger than the slit width. An end of the seal band 7 is inserted into the insertion hole 8 of the end cap 4 and is fixed to the end cap 4 by a set screw 11 screwed to a set plate 10 fixed by a mounting screw 9. I have. Reference numeral 12 denotes an external seal band, which is formed of a magnetic material to have a width larger than the slit width. The end of the seal band 12 is fastened to the end cap 4 via a push plate 10a by a mounting screw 9 for fixing the stop plate 10. Numeral 80 denotes a magnetic band consisting of a permanent magnet embedded in the upper surface 1a of the cylinder barrel 1 on both sides of the slit 3 as shown in FIG. 3, so as to adsorb both edges of the seal bands 7, 12. .

Reference numeral 13 denotes a piston which is slidably fitted in the sliding hole 2 and has annular grooves 1 around both ends 13a.
The piston packing 15 made of an elastic material is fitted in the annular grooves 14. These piston packings 15 are disposed at an appropriate interval L in the axial direction. The intermediate portion 13b of the piston 13 has a concave groove 17 on the lower side.
Is formed to have a substantially U-shaped cross section, and the seal band 7 is inserted into the concave groove 17. A connecting portion 16 is integrally formed on the outer periphery of the intermediate portion 13b. The connecting portion 16 includes an outer body 18 located outside the cylinder barrel 1 and a neck 19 penetrating the slit 3. The outer body 18 has a piston packing 15,
At a position corresponding to the center portion between the 15, there is provided a connecting hole 21 in a direction orthogonal to the moving direction of the piston 13, and a bush 22 is fitted into the connecting hole 21. A concave groove 18a is formed on the upper surface of the outer body 18, and the seal band 12 is fitted into the concave groove 18a. The intermediate part 13
Two magnets 20 are embedded in b, and the magnets 20 constitute an object to be detected for operating a position detection switch described later.

Reference numeral 23 denotes horizontal guide rails respectively provided on the upper surfaces 1a of the side walls on both sides of the slit 3 of the cylinder barrel 1, and are disposed along the entire length in the axial direction. The guide surface of the horizontal guide rail 23 is constituted by an upper surface 25a of a wear-resistant band 25 such as a stainless steel band adhered to a groove 24 formed in the upper surface 1a. As shown in FIG. 3, the wear-resistant band 25 is positioned almost directly above the side wall at the center of the cylinder barrel 1, that is, at the height of the center, and its upper surface 25a is positioned in the slit width direction (with the slit facing upward). In this case, it is formed in a substantially horizontal direction (in the left-right direction in FIG. 3) and substantially flush with the upper surface 1a of the cylinder barrel 1. The horizontal guide rail 23 may be constituted by the upper surface 1a of the cylinder barrel 1 which has been subjected to hard anodizing.

Reference numeral 26 denotes inclined guide rails provided on both sides of the slit 3 above the side surface 1b of the cylinder barrel 1, and are disposed over the entire length in the axial direction. The guide surface of the inclined guide rail 26 is constituted by an upper slope 27a of a substantially V-shaped guide groove 27 formed on the side surface 1b. The upper slope 27a is formed as a downward slope toward the center of the cylinder barrel 1, and its inclination angle is approximately 30 degrees downward with respect to the horizontal direction which is the slit width direction with the slit 3 facing upward. The angle is set. The inclined guide rail 26 may be constituted by a linear rolling guide attached to the side surface 1b of the cylinder barrel 1. Further, the inclination angle may be appropriately changed. 28 is a side surface 1b of the cylinder barrel 1 on both sides of the slit 3.
The mounting grooves are provided at the lower portions of the mounting member, and are formed over the entire length in the axial direction. As shown in FIG. 4, an engaging portion 29a of a support 29 is engaged with the mounting groove 28 at an arbitrary position, and the support 29 is fastened to a member to be mounted by a mounting bolt 30 so that a cylinder is provided. The barrel 1 can be fixed to the attached member. Reference numerals 31 denote locking grooves provided on both sides of the slit 3 at the intermediate portions of the side surfaces 1b of the cylinder barrel 1, and are formed over the entire length in the axial direction. As shown in FIG. 4, a locking portion 33a of a mounting member 33 of a position detection switch 32 is engaged with the locking groove 31 at an arbitrary position, and the position detection switch 32 is attached to the cylinder barrel 1 by tightening a mounting screw. It can be fixed.

Next, reference numeral 34 denotes a mount connected to the outer body 18 of the connecting portion 16. In the mount 34, a mount body 35 is formed to have a substantially U-shaped cross section,
It is located so as to cover the upper part of the cylinder barrel 1.
In the mount body 35, reference numeral 36 denotes a mount base located above the cylinder barrel 1, and a mounting screw hole 81 for mounting a moving body is provided on the upper surface. A concave groove 37 is formed on the lower surface of the mount base 36,
The external body 18 is fitted into the concave groove 37. A connection pin 38 that crosses the concave groove 37 is fixed to the mount base 36 at the center in the moving direction length by a screw 39, and the connection pin 38 is inserted into the hole of the bush 22 with a gap. The connecting pin 38 is formed with cutouts 38a on the upper and lower sides, respectively, to provide a two-plane width portion.
The gap in the direction orthogonal to the piston moving direction between the shaft and the bush 22 is slightly larger than the gap in the piston moving direction. In the mount body 35, 4
Reference numerals 0 and 41 denote a pair of holding pieces located on the side of the cylinder barrel 1, and are integrally formed to protrude downward from both sides of the mount base 36. One holding piece 40 is configured to be elastically deformable in the left-right direction by forming a thin connecting portion 40a by providing a stepped groove 36a on the side surface of the mount base 36 as shown in FIG. . As shown in FIG. 8, the holding piece 40 may be cut into the mount body 35 so as to be elastically deformable.

Reference numeral 42 denotes a guide provided on the lower surface of the mount base 36, and a pair of guides 42 are provided so as to be guided by the horizontal guide rail 23. When the mount body 35 is made of an aluminum material, the guide portion 42 is made of a metal sheet 43 such as an oil-impregnated sintered metal, and is suitable for a relatively low speed and high load. The guide section 42 is
When the mount body 35 is made of a steel material and its hardness is increased by quenching or the like, or when the mount body 35 is hardened.
Is made of aluminum material and stainless steel
When an abrasion-resistant band such as a tool is attached, it is preferable to use a needle roller of alloy steel or a needle roller with a flat retainer. When the horizontal guide rail 23 is constituted by the upper surface of the cylinder barrel 1, the guide portion 42 is made of a polyacetator.
It is preferable to use a plastic sheet such as a plastic resin or a sheet in which a copper alloy and a polyacetal resin are attached to a steel plate, which is suitable for a relatively high speed and low load. 44 and 45 are guide portions provided on the holding pieces 40 and 41, respectively.
A guide 47 made of a plastic material such as polyacetal resin is rotatably fitted in a concave groove 46 formed inside 41. The guide surface 47a of each guide body 47 slides on the inclined guide rail 26 by bringing a plurality of adjustment screws 48 screwed into the side surface of the mount base 36 into contact with the contact portion 40b of the holding piece 40. Closely movable. The gap between the guide surface 47a and the inclined guide rail 26 is adjusted to about 0.05 mm to about 0.1 mm. The guides 47, 47 are retained by retaining portions 50a, 51a of holding plates 50, 51 secured to both end surfaces of the mount body 35 by mounting bolts 49, respectively. The holding pieces 40, 41 are arranged at positions where a predetermined amount H has entered inside the piston packings 15, 15 respectively. The predetermined amount H is, for example, about 15 mm when the cylinder hole diameter is 25 mm, and the cylinder hole diameter is 40 mm.
mm is about 20 mm, and preferably about 10 mm or more because the influence of deformation of the cylinder barrel 1 during operation can be reduced.

Reference numeral 52 denotes seal band plates provided at both ends of the mount 34. The seal band plates 52 are sandwiched between the mount body 35 and the holding plates 50 and 51, and the lower central portion is a seal band plate. 12 is in sliding contact with the upper surface. The seal band plate 52 is made of a plastic material such as polyacetal resin. Reference numeral 53 denotes a substantially U-shaped scraper juxtaposed to the outside of the seal band plate 52, and the mount body 35 and the holding plates 50, 5
The lower portion thereof is slidably contacted with the upper surfaces of the seal band 12, the horizontal guide rail 23 and the cylinder barrel 1 and the inner surface of the guide groove 27, respectively. . The scraper 53 is made of an elastic material such as rubber. Reference numeral 54 denotes a grease nipple provided outside the holding pieces 40 and 41, and reference numeral 55 denotes an oil supply hole which can supply oil to a space formed between the upper surface of the cylinder barrel 1 and the lower surface of the mount 34.

Next, as shown in FIG. 6, reference numeral 57 denotes a mounting bracket for supporting a stopper to be described later, which is fixed to both ends of the cylinder barrel 1 respectively. The mounting bracket 57 is formed with a mounting screw hole 58 in the axial direction, and a female screw 58a of the mounting screw hole 58 is screwed with a male screw 59a of a stopper 59 formed of a screw body. The mounting bracket 57 has a cut groove 60 formed between the mounting screw hole 58 and one side surface, and a wall 57a above the cut groove 60 is elastically deformed vertically. At both ends of the mounting bracket 57, vertical insertion holes 61 are respectively formed, and one of the insertion holes 61 crosses the cut groove 60. A mounting bolt 62 is inserted into each of the insertion holes 61, and a fastening member 6 is attached to the tip of the mounting bolt 62.
3 is screwed into a screw hole 63a. The engaging portion 63b of the fastening body 63 is fitted into an arbitrary position of the guide groove 27, and by tightening the mounting bolt 62 at that position, the engaging portion 63b moves between the mounting bracket 57 and the cylinder barrel 1. The projecting portion 64 between the guide groove 27 and the upper surface 1a is clamped and fixed, and the mounting screw hole 58 is provided with the stopper -5.
9 is clamped and fixed. Reference numeral 65 denotes a screw hole provided in the wall 57a above the cut groove 60, and 66 denotes an open screw screwed into the screw hole 65, the tip of which abuts on the wall 57b below the cut groove 60. By doing so, the cutting groove 60 can be enlarged.

In the above construction, when compressed air is supplied to the cylinder chamber in the cylinder barrel 1 from one of the supply / discharge holes 6, the air pressure of the compressed air acts on the end face of the piston 13 to Is pressed and moved. The mount 34 is also moved via the connecting portion 16 and the connecting pin 38 by the movement of the piston 1. In the mount 34, guide portions 42, 42 are axially guided by horizontal guide rails 23, 23 of the cylinder barrel 1, and guide portions 44, 45 are axially guided by inclined guide rails 26, 26 of the cylinder barrel 1. The mount 34 is stably moved straight in the axial direction. In the above case, the air pressure of the compressed air supplied to the cylinder chamber acts on the inner surface of the cylinder barrel 1 to deform the slit 3 side portions of both side walls of the cylinder barrel 1 outward. As shown in FIG. 7, the amount of deformation of the side walls increases as the distance from the piston packing 15 increases, and decreases rapidly as the distance from the piston packing 15 increases. For example, when the air pressure of the cylinder chamber is 5 kgf / cm ² and the hole diameter of the cylinder barrel 1 is 25 mm,
The amount of deformation between the outer sides of both side walls at the position of the piston packing 15 is 0.03 mm. However, when the distance from the position of the piston packing 15 is 15 mm outside, the amount of deformation is 0.04 mm, and the amount of the deformation is 10 mm inside from the position of the piston packing 15. And its deformation amount becomes 0.02 mm, and when it moves inward by 40 mm from the position of the piston packing 15, the deformation amount becomes substantially zero. However, since the guides 44, 45 on both sides of the mount 34 are completely located inside the position of the piston packing 15, the inclined guide rails 26, 26 guide the guide body 47 by deformation of the both side walls. Surface 47a
Can be prevented from being strongly pressed against.

When the mount 34 is moved as described above, the scraper 53 is moved to the upper surface of the outer seal band 12, the horizontal guide rails 23, 23 and the cylinder barrel 1 and the guide grooves 27, 27. Each of the inner surfaces is slid to clean their surfaces, and the seal band plate 52 slides on the upper surface of the outer seal band 12 to securely adhere the seal band 12 to the magnetic band 80. When the mount 34 is moved to the moving end, it comes into contact with a stopper 59 and is stopped at an accurate position. When the piston 13 is moved to a predetermined position, the magnet 20 as a detection target activates the position detection switch 32.

Next, in a use state in which the cylinder barrel 1 is arranged so that the slit 3 faces upward, the mount 3
When a large downward load acts on the upper surface of the cylinder 4, the load is applied to the guide portions 42, 42 when the horizontal guide rail
The guide rails 23 support the horizontal guide rails 23. The horizontal guide rail 2
Since the upper surface 25a of each of the members 3 and 23 is formed in parallel with the slit width direction, the horizontal guide rails 23 and 23 apply the load via the guide portions 42 and 42 in a direction substantially perpendicular to the slit width direction. Accept only by force. Therefore, the load acts on both side walls of the cylinder barrel 1 only as a compressive force substantially in the vertical direction, hardly acts on a bending stress in the slit width direction, and the amount of deformation of the both side walls in the slit width direction is extremely small. As a result, even if the magnitude of the load acting on the upper surface of the mount 34 is considerably increased, the inclination guide rails 26, 2
6 can be prevented from being strongly pressed against the guide surface 47a of the guide body 47, and the mount 34 can be moved smoothly.

When a large rightward bending moment acts on the mount 34 in FIG. 3, for example,
The left guide 44 pushes the inclined guide rail 26 and the right guide 42 pushes the horizontal guide rail 23. When the left guide portion 44 pushes the inclined guide rail 26, the inclination angle of the upper inclined surface 27a of the inclined guide rail 26 becomes approximately 30 degrees downward with respect to the horizontal direction (slit width direction). Therefore, the inclined guide rail 26 applies the force of the guide portion 44 to the upward force and to the right (slit width direction) which is smaller than the upward force.
And the left side wall is slightly deformed inward. When the right guide portion 42 pushes the horizontal guide rail 23, the upper surface 25a of the horizontal guide rail 23 is formed parallel to the slit width direction.
Receives the force of the guide portion 42 by a downward force (a direction perpendicular to the slit width direction), and the right side wall receives almost no bending stress in the slit width direction and does not significantly deform inward. The right side wall is slightly deformed outward due to a slight outward bending stress. Therefore, even when a large lateral bending moment acts on the mount 34, the amount of deformation in the slit width direction of both side walls is extremely small, and the mount 34 can be moved smoothly. The same can be said for the case where the leftward bending moment in FIG. 3 acts on the mount 34.

Next, when it is desired to greatly change the stop position of the mount 34, that is, the moving stroke, the mounting bolt 62 is used.
To release the clamping of the overhang portion 64 by the fastening body 63,
In this state, the mounting bracket 57 is moved in the axial direction to move the fastening body 63 to a desired position of the guide groove 27, and the mounting bolt 62 is tightened again at that position to mount the mounting bracket 5.
7 is fixed to the cylinder barrel 1. In addition, the mount 3
When it is desired to slightly change the stop position of 4, that is, the moving stroke, the opening screw 66 is tightened with the mounting bolt 62 loosened, so that the tip of the opening screw 66 is located below the cut groove 60. The cutting groove 60 is enlarged so that the biting between the female screw 58a and the male screw 59a of the mounting screw hole 58 is released. Then stopper
The screw 59 is rotated to change the screwing position with the mounting screw hole 58. In this state, the opening screw 66 is loosened again, and the mounting bolt 62 is tightened to clamp and fix the stopper 59.

FIG. 8 shows a different example of the present invention. Overhangs 90, 90 are integrally provided on the side of the cylinder barrel 1e, and a horizontal guide rail 23e is provided on the upper surface of the overhangs 90, 90. , 23e, and their horizontal guide rails 23e, 2e
Guide portions 44 and 45 guided by 3e are provided on holding pieces 40e and 41e of mount 34e. The same parts as those in the above-mentioned embodiment are denoted by the same reference numerals,
And a duplicate description is omitted.

[0019]

As described above, according to the present invention, the mount outside the cylinder barrel can be guided straight in the axial direction by the horizontal and inclined guide rails of the cylinder barrel. Further, when a large load is applied to the upper surface of the mount, all or most of the load is substantially perpendicular to the slit width direction (generally horizontal direction when the slit is directed upward) by the horizontal guide rail on the upper surface. Even if such a large vertical load is applied, the deformation of the both side walls of the cylinder barrel due to the load can be suppressed to an extremely small amount, and the mount can be smoothly moved.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 1;

FIG. 7 is a graph showing a relationship between a piston packing position and an amount of deformation between both side walls of a cylinder barrel.

FIG. 8 is a sectional view showing a different embodiment.

[Explanation of symbols]

1 cylinder barrel, 3 slits, 7 seal bands, 12 seal bands, 13 pistons, 1
6 connecting part, 23 horizontal guide rail, 26 inclined guide rail, 34 mount, 42, 44, 45 guide part

Claims (1)

[Claims] 1. A piston is fitted in a sliding hole of a cylinder barrel having a slit long in the axial direction over a part of a peripheral wall, and a connecting portion provided on the piston is projected to the outside from the slit, and the connecting portion is formed. In a rodless cylinder in which a mount is connected to the section and the slit is sealed by a seal band, when the slit of the cylinder barrel is directed upward, a slit is provided on both side walls located on both the left and right sides of the slit. A horizontal guide rail having a substantially horizontal guide surface on the upper surface when facing upward.
Each of them is provided with an inclined guide rail having an obliquely downward inclined guide surface with respect to the horizontal guide rail, and the mount is provided with guides for the horizontal guide rail on both sides of the connecting portion. A rodless cylinder characterized in that a guide portion guided to the surface and a guide portion guided to the guide surface of the inclined guide rail are provided respectively.