JP2023054546A - Device for attaching liquid leakage port to hydraulic cylinder device and hydraulic cylinder device - Google Patents

Abstract

To provide a device for attaching a liquid leakage port to a hydraulic cylinder device 100, in particular, a device which enables a liquid leakage port 7 to be easily attached to an existing hydraulic cylinder device with no liquid leakage port in a state that the hydraulic cylinder device 100 is installed at a drive facility.SOLUTION: In a device for attaching a liquid leakage port, an attachment body 2 is divided into two parts at a position which intersects with a virtual extension line of a liquid leakage passage and is an axis center position of a piston rod 103. A crimp plate 3 is divided into two parts at a center position. A dust seal 42 is formed with a seal cutting part 43, and an O ring 52 is formed with a ring cutting part 53. In a state that two divided surfaces 21a, 21b in the attachment body 2 divided into the two parts are integrated through a gasket 22, the dust seal 42 is attached to an annular groove 41 by expanding its seal cutting part 43 and getting beyond the piston rod 103. The crimp plate 3 divided into the two parts is attached to the attachment body 2. Further, the O ring 52 is attached to an O ring groove 51 by expanding its ring cutting part 53 and getting beyond a rod bush 104.SELECTED DRAWING: Figure 1

Description

The present invention relates to a liquid leakage port attached device to a hydraulic cylinder device and a hydraulic cylinder device, and in particular, to an existing hydraulic cylinder device that is not provided with a liquid leakage port, and to install the hydraulic cylinder device in a drive facility. This technology relates to a device for attaching a liquid leakage port, which can easily attach a liquid leakage port in a closed state.

Conventionally, a device for attaching a liquid leakage port to a liquid pressure cylinder device, which enables an existing liquid pressure cylinder device without a liquid leakage port to be easily provided with a liquid leakage port at the installation site, has been developed by the present applicant. It is publicly known by proposal (see, for example, Patent Document 1).
Conventionally, there is also known a seal ring in which a cut portion is formed in the seal ring so that the seal ring can be replaced at the installation site of the hydraulic cylinder device (see, for example, Patent Document 2).

Japanese Patent No. 6902298 Japanese Patent No. 6735602

The device for attaching a liquid leakage port to the hydraulic cylinder device described in Patent Document 1 does not machine the existing hydraulic cylinder device which is not equipped with a liquid leakage port, and attaches a driver to the hydraulic cylinder device at the installation site. It is designed for easy installation.
However, in the device for attaching a liquid leakage port to a hydraulic cylinder device described in Patent Document 1, the existing hydraulic cylinder device is removed from its driving equipment and the tip of the extending portion of the rod bush in the piston rod of the hydraulic cylinder device is removed. Therefore, there is a problem that it is troublesome to attach and detach the hydraulic cylinder device and its driving equipment.

In addition, the seal ring described in Patent Document 2 is not an attachment of a liquid leakage port to an existing hydraulic cylinder device, but a replacement of the seal ring. However, there is a problem that it is not possible to eliminate the need to attach and detach the hydraulic cylinder device and its driving equipment.
Therefore, the present invention is intended to solve the problems that the conventional technology has, and to add a hydraulic cylinder device to an existing hydraulic cylinder device that is not provided with a liquid leakage port. To provide a device for attaching a liquid leakage port which can easily attach the liquid leakage port in a state of being installed in a liquid leakage port.

According to a first aspect of the present invention, there is provided a device for attaching a liquid leakage port to a hydraulic cylinder device, comprising a cylinder tube, a piston, a piston rod, a rod bushing, a rod side cover, and a head side cover. In a liquid leakage port attachment device that can be attached to a hydraulic cylinder device in which a piston rod extends through the rod bushing,
an inner peripheral portion in which the portion of the piston rod extending from the rod bushing can slide; a fitting portion in which an outer peripheral surface of the rod bushing can be fitted; and a dust seal mounted in an annular groove of the inner peripheral portion. and an O-ring mounted in the O-ring groove of the fitting portion, and formed between the annular groove and the O-ring groove passing between the dust seal and the O-ring from the extending portion. an attached main body having a liquid leakage channel for introducing the leaked liquid and a liquid leakage port at an end of the liquid leakage channel;
A crimping plate for crimping the dust seal to the annular groove is attached to the attachment body to form a liquid leakage port attachment device,
The attachment main body intersects the imaginary extension line of the liquid leakage passage and is divided into two at the axial center position of the piston rod, and the compression plate is divided into two at the center position,
The dust seal is formed with a seal cut portion for mounting in the annular groove over the piston rod, and the O-ring is formed with a ring cut portion for mounting in the O-ring groove over the rod bush. ,
The dust seal is installed in the annular groove by widening the seal cut portion and riding over the piston rod in a state where it is integrated with the two divided surfaces of the two-divided attachment body via a gasket, The divided compression plate is attached, and the O-ring is mounted in the O-ring groove by widening the cut portion of the O-ring and getting over the rod bush.

According to a second aspect of the present invention, there is provided a liquid leakage port attachment device for a hydraulic cylinder device according to the first aspect of the present invention. And, the seal cut portion of the dust seal is the one in which the dust seal is mounted in the annular groove of the attached main body so as not to overlap when viewed in the axial direction from the tip side of the piston rod.

According to a third aspect of the present invention, there is provided a device for providing a liquid leakage port for a hydraulic cylinder device, in addition to the configuration of the device for providing a liquid leakage port for a hydraulic cylinder device according to the first or second aspect. The part and the 2-split position of the crimping plate are those in which the dust seal and the crimping plate are disposed on the attachment main body so as not to overlap each other when seen through in the axial direction from the tip side of the piston rod. is.

According to a fourth aspect of the present invention, there is provided a device for providing a liquid leakage port for a hydraulic cylinder device according to any one of claims 1 to 3. The gasket interposed between the dividing surfaces of the main body is made of a liquid gasket.

According to a fifth aspect of the present invention, there is provided a hydraulic cylinder device in which the device for providing a liquid leak port to the hydraulic cylinder device according to any one of the first to fourth aspects is attached to the hydraulic cylinder device.

The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 1 is that the inner peripheral portion where the portion of the piston rod extending from the rod bush can slide, and the outer peripheral portion of the rod bush. a fitting portion with which the surfaces can be fitted; a dust seal mounted in the annular groove of the inner peripheral portion; an O-ring mounted in the O-ring groove of the fitting portion; a liquid leakage passage formed between the annular groove and the O-ring groove and passing between the O-rings to introduce the leakage liquid; and a liquid leakage port at the end of the liquid leakage passage. An attachment body is formed, and a crimping plate for crimping the dust seal to the annular groove is attached to the attachment body to form a liquid leakage port attachment device, and the attachment body intersects an imaginary extension line of the liquid leakage flow path. The piston rod is divided into two at the axial center position, the crimping plate is divided into two at the center position, and the dust seal is formed with a seal cut portion for mounting in the annular groove over the piston rod. In addition, the O-ring is formed with a ring cutting portion for mounting in the O-ring groove over the rod bushing, and is integrated with the two-divided surface of the two-divided attachment body via a gasket. In this state, the seal cut portion is widened to ride over the piston rod, the dust seal is mounted in the annular groove, and the two-piece crimping plate is attached, and the O-ring cut portion is widened to remove the rod bushing. Since the O-ring is installed in the O-ring groove by riding over, the existing liquid pressure cylinder device without a liquid leakage port can be easily installed at the installation site while the existing hydraulic cylinder device is installed in the driving device. of.
Therefore, the liquid leakage port attachment device can be attached to the hydraulic cylinder device without detaching the hydraulic cylinder device and its driving device.

The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 2 is obtained in addition to the effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 1. The dust seal is mounted in the annular groove of the attached main body so that the halves of the dust seal and the seal cut portion of the dust seal do not overlap when viewed in the axial direction from the tip end of the piston rod. Therefore, it is possible to prevent liquid from leaking from the halves of the attached main body and from the sealing cut portion of the dust seal, and to reliably guide the leaked liquid to the liquid leakage port at the end of the liquid leakage flow path.

In addition to the effects of the device for providing a liquid leakage port for a hydraulic cylinder device of the present invention, the effect of the device for providing a liquid leakage port for a hydraulic cylinder device of the present invention according to claim 3 is the above-described effect. The dust seal and the crimping plate are arranged in the attached main body so that the seal cutting portion of the dust seal and the halving position of the crimping plate do not overlap when viewed in the axial direction from the tip side of the piston rod. As a result, it is possible to prevent liquid leakage from the sealing cut portion of the dust seal and the two-divided position of the crimping plate, and to reliably guide the leaked liquid to the liquid leakage port at the end of the liquid leakage flow path. You can.

The effect of the liquid leak port attachment device for the hydraulic cylinder device of the present invention according to claim 4 is the same as the effect of the liquid leak port attachment device for the hydraulic cylinder device of the present invention according to any one of claims 1 to 3. In addition, since the gasket interposed between the dividing surfaces of the attachment main body is made of a liquid gasket, the dividing surface of the attachment main body can be easily sealed by applying the liquid gasket.

The effect of the hydraulic cylinder device of the present invention according to claim 5 is that the liquid leakage port attachment device for the hydraulic cylinder device according to any one of claims 1 to 4 is attached to the hydraulic cylinder device, It is possible to obtain the effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to any one of claims 1 to 4.

1A and 1B are an exploded perspective view showing a device for attaching a liquid leakage port to a hydraulic cylinder device according to a first embodiment of the present invention, and a perspective view showing the hydraulic cylinder device; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted view showing a state in which a device for providing a liquid leak port to a hydraulic cylinder device according to the first embodiment of the present invention is attached to the hydraulic cylinder device, in which (a) is a perspective view; b) is a front view and (c) is a sectional view. It is the elements on larger scale of FIG.2(c). BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the dust seal used for the liquid-leak port attachment apparatus to the hydraulic-pressure-cylinder apparatus which concerns on 1st embodiment of this invention, (a) is a front view, (b) is a right side view, (c) is a (b) is a sectional view taken along line AA, and (d) is a right side perspective view. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the liquid-leak port attachment apparatus to the hydraulic-pressure-cylinder apparatus which concerns on 1st embodiment of this invention, (a) is a front view, (b) is a left side view, (c) is a right view and (d) is a bottom view. 5(a) is a sectional view taken along line BB of FIG. 5(b), and (b) is a perspective view of FIG. 5(b).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 are drawings according to a first embodiment of the present invention. FIG. 1 is an exploded perspective view showing a device for providing a liquid leak port to a hydraulic cylinder device, and a perspective view showing the hydraulic cylinder device. FIG. 2 is a partially omitted view showing a state in which a liquid leakage port attachment device for a hydraulic cylinder device is attached to the hydraulic cylinder device, (a) is a perspective view, (b) is a front view and ( c) is a cross-sectional view, FIG. 3 is a partially enlarged view of FIG. b) is a left side view, (c) is a cross-sectional view along line AA of (b), and (d) is a right perspective view, and FIG. a) is a front view, (b) is a left side view, (c) is a right side view and (d) is a bottom view, and FIG. (b) is a perspective view of FIG.5(b).

1 to 6 showing the first embodiment of the present invention, reference numeral 1 denotes a device for providing a liquid leak port to a hydraulic cylinder device 100. FIG.
The hydraulic cylinder device 100 includes a cylinder tube 101, a piston 102, a piston rod 103, a rod bushing 104, a rod side cover 105, and a head side cover .

The piston rod 103 extends from the cylinder tube 101 through a rod bushing 104, and an equipment drive fitting 107 is fixed to the end of the extension portion 103a of the piston rod 103. A load (not shown) such as is attached to operate the hydraulic cylinder device 100 .
The liquid leakage port attachment device 1 is composed of an attachment main body 2 and a compression plate 3 which will be described later.

The attached main body 2 includes an inner peripheral portion 4 in which the extension portion 103a of the piston rod 103 from the rod bushing 104 can slide, a fitting portion 5 in which the outer peripheral surface 104a of the rod bushing 104 can be fitted, and an inner peripheral portion. 4, an O-ring 52 mounted in the O-ring groove 51 of the fitting portion 5, and an annular groove extending between the dust seal 42 and the O-ring 52 from the extending portion 103a. It is formed of a liquid leakage passage 6 formed between the groove 41 and the O-ring groove 51 and leading the leaked liquid, and a liquid leakage port 7 at the end of the liquid leakage passage 6 .
The crimping plate 3 is attached to the attachment body 2 for crimping the dust seal 42 into the annular groove 41 .

As shown in FIGS. 3 and 5(c), the liquid leakage flow path 6 formed in the attachment main body 2 of the liquid leakage port attachment device 1 has a semicircular cross-sectional groove at the portion that abuts the end surface of the rod bushing 104. is formed in
The attached main body 2 is divided into a first split attached main body 2a and a second split attached main body 2b at the axial center position of the piston rod 103 perpendicular to the imaginary extension line of the liquid leakage flow path 6. As shown in FIG.

As shown in FIGS. 5 and 6, the first split attachment body 2a of the attachment body 2 is provided with a liquid leakage port 7 at the end of the liquid leakage flow path 6 via a connecting portion 71. As shown in FIGS.
The connecting portion 71 of the liquid leakage port 7 is fixed to a female screw (not shown) formed in the mounting seat 72 with two screws 73 on the mounting seat 72 of the attached main body 2, and a pipe joint is attached to the end of the connecting portion 71. 74 are screwed together.

Although not shown, the device 1 provided with the liquid leakage port is provided with a liquid leakage detection device for detecting liquid leakage from the liquid leakage port 7, so that the user of the hydraulic cylinder device 100 can detect the liquid leakage of the hydraulic cylinder device 100. is detected so that maintenance of the hydraulic cylinder device 100 can be performed.
Further, the compression plate 3 is divided into a first divided compression plate 3a and a second divided compression plate 3b at the center position.

The dust seal 42 is formed by molding PTFE, and as shown in FIG.
In FIG. 4C, the seal cut portion 43 includes a first inclined surface 43a that intersects the circumferential direction, a first vertical surface 43b that extends along the circumferential direction, and a second inclined surface 43b that intersects the circumferential direction. The surface 43c, the second vertical surface 43d extending along the circumferential direction, and the third inclined surface 43e intersecting the circumferential direction form a continuous surface.

The dust seal 42 has a recessed portion 44 formed in the center of the inner peripheral surface, two protruding portions 45 formed in the outer peripheral portion, and an annular space 46 having a wedge-shaped cross section in the center of the side peripheral surface on the rod bushing 104 side. formed.
When the dust seal 42 formed in this manner is mounted in the annular groove 41, as shown in FIG. 103a and the annular groove 41 to ensure the blocking of liquid leakage.

Also, the O-ring 52 is made of nitrile rubber, and a ring cutting portion 53 (see FIG. 1) for mounting in the O-ring groove 51 of the fitting portion 5 over the rod bushing 104 is formed orthogonal to the circumference. It is
Next, an example of a procedure for attaching the leak port installation device 1 to the existing hydraulic cylinder device 100 without detaching the hydraulic cylinder device 100 and its driving device, such as a mold, will be described.

1 and 2, the piston 102 of the hydraulic cylinder device 100 is moved toward the rod bushing 104 so that the piston rod 103 extends. The portion 103a can also be lengthened to increase the working space.
First, the liquid gasket 22, which is a silicone RTV gasket, is applied to the first split surface 21a of the first split attachment main body 2a or the second split surface 21b of the second split attachment main body 2b in the attachment main body 2 split into two. After application, two hexagon socket head bolts 23 are screwed into the female screw holes 24 around the extending portion 103a of the piston rod 103 to assemble and integrate.

By applying the liquid gasket 22 to the first split surface 21a or the second split surface 21b of the second split attachment main body 2b in this manner, the split surfaces 21a and 21b of the attachment main body 2 can be easily sealed. be.
A dust seal 42 is installed in the annular groove 41 of the attachment main body 2 in an integrated state by widening the seal cut portion 43 and overcoming the extended portion 103a of the piston rod 103, and the first crimping of the crimping plate 3 divided into two is performed. The plate 3a and the second crimping plate 3b are attached by screwing two countersunk screws 31 into the female screw holes 27, respectively.

In addition, the O-ring 52 is mounted in the O-ring groove 51 in the attachment main body 2 in an integrated state by widening the ring cutting portion 53 and getting over the rod bushing 104 .
Then, in attaching the liquid leakage port attachment device 1 to the existing hydraulic cylinder device 100,
The two division positions (first division surface, second division surface) 21a and 21b of the attachment main body 2 and the seal cut portion 43 of the dust seal 42 are seen through from the equipment driving metal fitting 107 on the tip side of the piston rod 103 in the axial direction. The dust seal 42 is mounted in the annular groove 41 of the attachment main body 2 so as not to be overlapped, for example, at an angle of 45 degrees around the axial center of the piston rod 103 .

In this manner, the halves 21a and 21b of the attachment main body 2 and the seal cut portion 43 of the dust seal 42 are not overlapped, so that the halves 21a and 21b of the attachment main body 2 and the dust seal 42 are sealed. By preventing liquid leakage from the cut portion 43 , the leaked liquid can be reliably guided to the liquid leakage port 7 at the end of the liquid leakage flow path 6 .
Further, the seal cut portion 43 of the dust seal 42 and the two-part dividing position 32 of the crimping plate 3 are arranged so as not to overlap each other when viewed in the axial direction from the equipment driving metal fitting 107 which is the tip end side of the piston rod 103 so as not to overlap. The dust seal 42 and the compression plate 3 are arranged on the attached main body 2 with an angle of 45 degrees shifted from the axial center of the rod 103 .

In this way, the seal cut portion 43 of the dust seal 42 and the halves portion 32 of the crimping plate 3 are not overlapped, so that the seal cut portion 43 of the dust seal 42 and the halves portion 32 of the crimping plate 3 do not overlap. This prevents liquid from leaking out of the liquid leakage passage 6 and ensures that the leaked liquid can be led to the liquid leakage port 7 at the end of the liquid leakage flow path 6 .
How to attach the leak port attachment device 2 to the hydraulic cylinder device 100 ? The setscrew 25, for example, a cone type hexagon socket setscrew, is screwed into the female threaded hole 26 in the attachment body 2 on the cylinder tube 101 side of the O-ring 52, as shown in FIG.

As described above, according to the first embodiment of the present invention, the hydraulic cylinder device 100 and its drive can be installed without machining the hydraulic cylinder device 100, which is manufactured by a manufacturer. It can be easily attached to the hydraulic cylinder device 100 at the installation site with a wrench or screwdriver without detaching from the device.
Next, a second embodiment of the invention will be described.

The second embodiment, as shown in FIG. 2, is a hydraulic cylinder device provided with a device 1 for providing a leak port.
1, 108 is a fixed flange, 109 is a tie rod, 110 is a nut, and in FIG. is the dust packing.

Next, a modification of the first embodiment of the invention will be described.
In the first embodiment, the attachment main body 2 is divided into the first split attachment main body 2a and the second split attachment main body 2b at the axial center position of the piston rod 103 perpendicular to the imaginary extension line of the liquid leakage flow path 6. Although it is divided, it may not be orthogonal to the imaginary extension line of the liquid leakage channel 6 but may intersect it.

In addition, in the first embodiment, the halves 21a and 21b of the attached main body 2 and the seal cut portion 43 of the dust seal 42 are arranged so as not to overlap each other when viewed in the axial direction from the tip side of the piston rod 103. Although the dust seal 42 is mounted in the annular groove 41 of the attachment body 2, it may overlap.
Further, in the first embodiment, the seal cutting portion 43 of the dust seal 42 and the two-part dividing position 32 of the crimping plate 3 are arranged so as not to overlap each other when seen in the axial direction from the tip end side of the piston rod 103 . Although 42 and crimping plate 3 are arranged on attachment body 2, they may overlap.

Furthermore, in the first embodiment, the gasket interposed between the dividing surfaces 21a and 21b of the attachment main body 2 is made of a silicone RTV gasket (room temperature curing type liquid gasket), but various other gaskets may be used. good.

1 Liquid leak port attached device to hydraulic cylinder device 2 Attached main body 2a First split attached main body 2b Second split attached main body 21a First split surface (two split positions)
21b Second dividing surface (two dividing position)
22 gasket (liquid gasket)
3 Crimping plate 3a First split crimping plate 3b Second split crimping plate 32 Bifurcation position of crimping plate 4 Inner peripheral portion 41 Annular groove 42 Dust seal 43 Seal cutting portion 5 Fitting portion 51 O-ring groove
52 O-ring 53 Ring cut portion 6 Liquid leakage passage 7 Liquid leakage port 100 Hydraulic cylinder device 101 Cylinder tube 102 Piston 103 Piston rod 103a Extension portion 104 Rod bushing 104a Outer peripheral surface 105 Rod side cover 106 Head side cover

Claims (5)

A cylinder tube, a piston, a piston rod, a rod bushing, a rod-side cover, and a head-side cover are provided, and the piston rod can be attached to a hydraulic cylinder device extending through the rod bushing. In a device with a liquid leakage port,
an inner peripheral portion in which the portion of the piston rod extending from the rod bushing can slide; a fitting portion in which an outer peripheral surface of the rod bushing can be fitted; and a dust seal mounted in an annular groove of the inner peripheral portion. and an O-ring mounted in the O-ring groove of the fitting portion, and formed between the annular groove and the O-ring groove passing between the dust seal and the O-ring from the extending portion. an attached main body having a liquid leakage channel for introducing the leaked liquid and a liquid leakage port at an end of the liquid leakage channel;
A crimping plate for crimping the dust seal to the annular groove is attached to the attachment body to form a liquid leakage port attachment device,
The attachment main body intersects the imaginary extension line of the liquid leakage passage and is divided into two at the axial center position of the piston rod, and the compression plate is divided into two at the center position,
The dust seal is formed with a seal cut portion for mounting in the annular groove over the piston rod, and the O-ring is formed with a ring cut portion for mounting in the O-ring groove over the rod bush. ,
The dust seal is installed in the annular groove by widening the seal cut portion and riding over the piston rod in a state where it is integrated with the two divided surfaces of the two-divided attachment body via a gasket, Liquid leakage to a hydraulic cylinder device characterized in that the divided crimping plate is attached, and the O-ring is mounted in the O-ring groove by widening the cut portion of the ring to get over the rod bushing. Port attached device. The dust seal is mounted in the annular groove of the attachment body so that the halves of the attachment body and the seal cut portion of the dust seal do not overlap when viewed in the axial direction from the tip side of the piston rod. 2. A device for providing a liquid leakage port to a hydraulic cylinder device according to claim 1, wherein the liquid leakage port is provided. The dust seal and the crimping plate are arranged on the attached main body so that the seal cutting portion of the dust seal and the crimping plate are divided into two parts so that they do not overlap when viewed in the axial direction from the tip side of the piston rod. 3. A liquid leakage port attachment device for a hydraulic cylinder device according to claim 1 or 2, characterized in that a leak port is provided. 4. The liquid leakage port attachment device for a hydraulic cylinder device according to claim 1, wherein a gasket interposed between said dividing surfaces of said attachment main body is formed of a liquid gasket. 5. A hydraulic cylinder device, wherein the liquid leak port attachment device for a hydraulic cylinder device according to claim 1 is attached to the hydraulic cylinder device.

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