Device for attaching a liquid leakage port to a hydraulic cylinder device and hydraulic cylinder device

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

[Technical field]

[0001] The present invention relates to a fluid leakage port attaching device for a hydraulic cylinder device and a hydraulic cylinder device, and in particular to a technology related to a fluid leakage port attaching device that enables a fluid leakage port to be easily attached to an existing hydraulic cylinder device that does not have a fluid leakage port while the hydraulic cylinder device is installed in drive equipment. [Background technology]

[0002] A liquid leakage port attaching device for a hydraulic cylinder device that allows a liquid leakage port to be easily attached at the installation site to an existing hydraulic cylinder device that does not have a liquid leakage port has been proposed by the present applicant and is known (see, for example, Patent Document 1). Furthermore, it is also known that a seal ring can be replaced at the installation site of a hydraulic cylinder device by forming a cut portion in the seal ring (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6902298 [Patent Document 2] Patent No. 6735602 Summary of the Invention [Problem to be solved by the invention]

[0004] The device for attaching a fluid leakage port to a hydraulic cylinder device described in Patent Document 1 can be easily attached to an existing hydraulic cylinder device that does not have a fluid leakage port with a screwdriver at the installation site, without requiring machining of the existing hydraulic cylinder device. However, the device for attaching a liquid leakage port to a hydraulic cylinder device described in Patent Document 1 requires the existing hydraulic cylinder device to be removed from its drive equipment and then attached to the tip of the extending portion of the rod bush in the piston rod of the hydraulic cylinder device, which poses a problem that it is time-consuming to attach and detach the hydraulic cylinder device from its drive equipment.

[0005] Furthermore, the seal ring described in Patent Document 2 is not for adding a liquid leakage port to an existing hydraulic cylinder device but for replacing the seal ring. Therefore, even if the seal ring of Patent Document 2 is combined with the seal ring of Patent Document 1, there is a problem in that it is not possible to eliminate the need to attach and detach the hydraulic cylinder device and its drive equipment. Therefore, the present invention is intended to solve the problems associated with such conventional techniques, and aims to provide a liquid leakage port attachment device that allows a liquid leakage port to be easily attached to an existing hydraulic cylinder device that does not have a liquid leakage port while the hydraulic cylinder device is installed in the drive equipment. [Means for solving the problem]

[0006] The fluid leakage port attachment device for a hydraulic cylinder device of the present invention according to claim 1 is a fluid leakage port attachment device that can be attached to a hydraulic cylinder device that includes a cylinder tube, a piston, a piston rod, a rod bush, a rod side cover, and a head side cover, and in which the piston rod extends through the rod bush, an attachment body is formed which includes an inner circumferential portion on which the portion of the piston rod extending from the rod bush can slide, a fitting portion into which the outer circumferential surface of the rod bush can be fitted, a dust seal fitted in the annular groove of the inner circumferential portion, an O-ring fitted in the O-ring groove of the fitting portion, a liquid leakage flow path formed between the annular groove and the O-ring groove and which guides leaking liquid from the extending portion through between the dust seal and the O-ring, and a liquid leakage port at an end of the liquid leakage flow path; a pressure plate for pressing the dust seal into the annular groove is attached to the attachment body to form a liquid leakage port attachment device; The attached main body intersects the virtual extension line of the liquid leakage flow path and is divided into two parts at the axial center position of the piston rod, and the pressure plate is divided into two parts at the center position. The dust seal is formed with a seal cutting portion for mounting on the annular groove over the piston rod, and the O-ring is formed with a ring cutting portion for mounting on the O-ring groove over the rod bush. In a state where the two divided parts of the attached main body are integrated via a gasket on the divided surface, the seal cutting portion is widened to straddle the piston rod, and the dust seal is mounted on the annular groove. The two divided pressure plates are attached, and the O-ring cutting portion is widened to straddle the rod bush, and the O-ring is mounted on the O-ring groove.

[0007] The liquid leakage port attachment device for the hydraulic cylinder device according to claim 2 of the present invention, in addition to the configuration of the liquid leakage port attachment device for the hydraulic cylinder device according to claim 1, the two divided positions of the attached main body and the seal cutting portion of the dust seal are such that when viewed axially from the tip side of the piston rod, the dust seal is mounted on the annular groove of the attached main body so as not to overlap.

[0008] The liquid leakage port attachment device for the hydraulic cylinder device according to claim 3 of the present invention, in addition to the configuration of the liquid leakage port attachment device for the hydraulic cylinder device according to claim 1 or 2, the seal cutting portion of the dust seal and the two divided positions of the pressure plate are such that when viewed axially from the tip side of the piston rod, the dust seal and the pressure plate are arranged on the attached main body so as not to overlap.

[0009] The liquid leakage port attachment device for the hydraulic cylinder device according to claim 4 of the present invention, in addition to the configuration of the liquid leakage port attachment device for the hydraulic cylinder device according to any one of claims 1 to 3, the gasket interposed on the divided surface of the attached main body is formed from a liquid gasket.

[0010] The hydraulic cylinder device of the present invention according to claim 5 is a device in which a 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.

Effect of the Invention

[0011] The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 1 is that an inner peripheral portion where an extending portion from the rod bush on the piston rod is slidable, a fitting portion where the outer peripheral surface of the rod bush can be fitted, a dust seal mounted in an annular groove of the inner peripheral portion, an O-ring mounted in an O-ring groove of the fitting portion, a liquid leakage flow path for guiding liquid leakage formed between the annular groove and the O-ring groove through between the dust seal and the O-ring from the extending portion, and a liquid leakage port at an end of the liquid leakage flow path are provided to form an attachment main body. A crimping plate for crimping the dust seal to the annular groove is attached to the attachment main body to form a liquid leakage port attachment device. The attachment main body intersects a virtual extension line of the liquid leakage flow path and is divided into two at the axial center position of the piston rod, the crimping plate is divided into two at the center position, the dust seal is formed with a seal cutting portion for mounting the dust seal to the annular groove over the piston rod, and the O-ring is formed with a ring cutting portion for mounting the O-ring to the O-ring groove over the rod bush. In a state where the two divided attachment main bodies are integrated via a gasket on the divided surfaces of the two divided parts, the seal cutting portion is widened to mount the dust seal to the annular groove over the piston rod, the two divided crimping plates are attached, and the O-ring is mounted to the O-ring groove by widening the O-ring cutting portion over the rod bush. Therefore, it is possible to easily attach a liquid leakage port at the installation site while the existing hydraulic cylinder device without a liquid leakage port is installed in the driving device. 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.

[0012] The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 2, 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, is that the two-part position of the attachment body and the seal cutting portion of the dust seal do not overlap when viewed axially from the tip side of the piston rod, because the dust seal is mounted in the annular groove of the attachment body. Therefore, it is possible to prevent leakage of liquid from the two-part position of the attachment body and the seal cutting portion of the dust seal, and reliably guide the leaked liquid to the liquid leakage port at the end of the liquid leakage flow path.

[0013] The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 3, 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 or 2, is that the seal cutting portion of the dust seal and the two-part position of the crimping plate do not overlap when viewed axially from the tip side of the piston rod, because the dust seal and the crimping plate are arranged on the attachment body. Therefore, it is possible to prevent leakage of liquid from the seal cutting portion of the dust seal and the two-part position of the crimping plate, and reliably guide the leaked liquid to the liquid leakage port at the end of the liquid leakage flow path.

[0014] The effect of the liquid leakage port attachment device for the hydraulic cylinder device of the present invention according to claim 4, in addition to 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 3, is that the gasket interposed between the split surfaces in the attachment body is formed from a liquid gasket. Therefore, the seal of the split surface of the attachment body can be easily performed by applying the liquid gasket.

[0015] The effect of the hydraulic cylinder device of the present invention according to claim 5 is that, since the liquid leakage port attachment device for the hydraulic cylinder device described in any one of claims 1 to 4 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 any one of claims 1 to 4 can be achieved.

Brief Description of the Drawings

[0016] [Figure 1] The exploded perspective view showing the liquid leakage port attachment device to the hydraulic cylinder device according to the first embodiment of the present invention and the perspective view showing the hydraulic cylinder device. [Diagram 2] The figure showing a state where the liquid leakage port attachment device to the hydraulic cylinder device according to the first embodiment of the present invention is attached to the hydraulic cylinder device with a part omitted, (a) is a perspective view, (b) is a front view, and (c) is a cross-sectional view. [Figure 3] The partially enlarged view of FIG. 2(c). [Figure 4] The figure showing the dust seal used for the liquid leakage port attachment device to the hydraulic cylinder device according to the first embodiment of the present invention, (a) is a front view, (b) is a right side view, (c) is a cross-sectional view taken along the line A-A of (b), and (d) is a right side perspective view. [Figure 5] The figure showing the liquid leakage port attachment device to the hydraulic cylinder device according to the first embodiment of the present invention, (a) is a front view, (b) is a left side view, (c) is a right side view, and (d) is a bottom view. [Figure 6] (a) is a cross-sectional view taken along the line B-B of FIG. 5(b), and (b) is a perspective view of FIG. 5(b).

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figs. 1 to 6 are drawings related to the first embodiment of the present invention. Fig. 1 is an exploded perspective view showing a liquid leakage port attachment device to a hydraulic cylinder device and a perspective view showing the hydraulic cylinder device. Fig. 2 is a view showing a state where the liquid leakage port attachment device to the hydraulic cylinder device is attached to the hydraulic cylinder device with a part omitted, (a) is a perspective view, (b) is a front view, and (c) is a sectional view. Fig. 3 is a partially enlarged view of Fig. 2(c). Fig. 4 is a view showing a dust seal used for the liquid leakage port attachment device to the hydraulic cylinder device, (a) is a front view, (b) is a left side view, (c) is a sectional view taken along line A-A of (b), and (d) is a right side perspective view. Fig. 5 is a view showing the liquid leakage port attachment device to the hydraulic cylinder device, (a) is a front view, (b) is a left side view, (c) is a right side view, and (d) is a bottom view. Fig. 6 is (a) a sectional view taken along line B-B of Fig. 5(b), and (b) a perspective view of Fig. 5(b).

[0018] In Figs. 1 to 6 showing the first embodiment of the present invention, 1 is a liquid leakage port attachment device to the hydraulic cylinder device 100. The hydraulic cylinder device 100 includes a cylinder tube 101, a piston 102, a piston rod 103, a rod bush 104, a rod side cover 105, and a head side cover 106.

[0019] The piston rod 103 passes through the rod bush 104 and extends from the cylinder tube 101. An equipment drive fitting 107 is fixed to the end of the extending portion 103a of the piston rod 103, and a load (not shown) such as a mold is attached to the equipment drive fitting 107 so that the hydraulic cylinder device 100 can be operated. The liquid leakage port attachment device 1 is formed of an attachment main body 2 and a crimping plate 3 to be described later.

[0020] The attached main body 2 is formed by an inner peripheral portion 4 where the extending portion 103a from the rod bush 104 on the piston rod 103 can slide, a fitting portion 5 where the outer peripheral surface 104a of the rod bush 104 can be fitted, a dust seal 42 mounted in the annular groove 41 of the inner peripheral portion 4, an O-ring 52 mounted in the O-ring groove 51 of the fitting portion 5, a liquid leakage flow path 6 formed between the annular groove 41 and the O-ring groove 51 through the space between the extending portion 103a, the dust seal 42, and the O-ring 52, and a liquid leakage port 7 at the end of the liquid leakage flow path 6. The crimping plate 3 is attached to the attached main body 2 in order to crimp the dust seal 42 to the annular groove 41.

[0021] As shown in FIGS. 3 and 5(c), the liquid leakage flow path 6 formed in the attached main body 2 of the liquid leakage port attached device 1 has a portion in contact with the end face of the rod bush 104 formed as a groove with a semicircular cross section. The attached main body 2 is divided into a first divided attached main body 2a and a second divided attached main body 2b at the axial center position of the piston rod 103, orthogonal to the virtual extension line of the liquid leakage flow path 6.

[0022] And as shown in FIGS. 5 and 6, the first divided attached main body 2a of the attached main body 2 is provided with a liquid leakage port 7 at the end of the liquid leakage flow path 6 via a connection portion 71. The connection portion 71 of the liquid leakage port 7 is fixed to a female screw (not shown) formed in the mounting seat 72 of the attached main body 2 with two screws 73, and a pipe joint 74 is screwed to the end of the connection portion 71.

[0023] Although not shown, a liquid leakage detection device for detecting the liquid leakage from the liquid leakage port 7 is provided in the liquid leakage port attached device 1 so that the user of the hydraulic cylinder device 100 can detect the liquid leakage of the hydraulic cylinder device 100 and perform maintenance of the hydraulic cylinder device 100. Also, the crimping plate 3 is divided into a first divided crimping plate 3a and a second divided crimping plate 3b at the center position.

[0024] The dust seal 42 is formed by molding PTFE, and as shown in FIG. 4, a seal cutout 43 is formed to allow the seal to be fitted into the annular groove 41 by climbing over the piston rod 103. In Figure 4(c), the seal cutting portion 43 is configured so that a first inclined surface 43a intersecting the circumferential direction, a first vertical surface 43b extending along the circumferential direction, a second inclined surface 43c intersecting the circumferential direction, a second vertical surface 43d extending along the circumferential direction, and a third inclined surface 43e intersecting the circumferential direction form a continuous surface.

[0025] The dust seal 42 has a recess 44 formed in the center of its inner circumferential surface, two protrusions 45 formed on its outer circumferential surface, and an annular cavity 46 with a wedge-shaped cross section formed in the center of its side circumferential surface on the rod bush 104 side. When the dust seal 42 formed in this manner is fitted into the annular groove 41, as shown in FIG. 3, it is compressed and deformed by the recessed portion 44, the protruding portion 45, the annular space 46, etc., and adheres closely to the extending portion 103a of the piston rod 103 and the annular groove 41, reliably blocking leakage.

[0026] The O-ring 52 is made of nitrile rubber, and has a ring cutout 53 (see FIG. 1) formed perpendicular to the circumference for mounting it over the rod bush 104 into the O-ring groove 51 of the fitting portion 5. Next, an example of a procedure for attaching the liquid leakage port attaching device 1 to an existing hydraulic cylinder device 100 without detaching the hydraulic cylinder device 100 and its drive device, such as a mold, will be described.

[0027] When attaching the liquid leakage port attachment device 1 to the hydraulic cylinder device 100, in Figures 1 and 2, the piston 102 of the hydraulic cylinder device 100 can be moved toward the rod bush 104 to lengthen the extending portion 103a of the piston rod 103, thereby widening the working space. First, apply a liquid gasket 22, which is a silicone RTV gasket, to the first split surface 21a of the first split attachment body 2a or the second split surface 21b of the second split attachment body 2b in the two-split attachment body 2, and assemble and integrate them by screwing two hexagon socket head bolts 23 around the extended portion 103a of the piston rod 103 into the female screw holes 24.

[0028] In this way, by applying the liquid gasket 22 to the first split surface 21a or the second split surface 21b of the second split attachment body 2b, the sealing of the split surfaces 21a and 21b of the attachment body 2 can be easily performed. In the integrated attachment body 2, spread the seal cutting portion 43 to straddle the extended portion 103a of the piston rod 103, and mount the dust seal 42 in the annular groove 41. The first crimping plate 3a and the second crimping plate 3b of the two-split crimping plate 3 are respectively attached by screwing two round head screws 31 into the female screw holes 27.

[0029] Also, in the integrated attachment body 2, spread the ring cutting portion 53 to straddle the rod bush 104, and mount the O-ring 52 in the O-ring groove 51. Then, in the attachment of the liquid leakage port attachment device 1 to the existing hydraulic cylinder device 100, The split positions (the first split surface, the second split surface) 21a and 21b of the attachment body 2 and the seal cutting portion 43 of the dust seal 42 are arranged so as not to overlap when viewed axially through the equipment drive fitting 107 on the tip side of the piston rod 103. For example, the dust seal 42 is mounted in the annular groove 41 of the attachment body 2 with a 45-degree angular shift centered on the axial center of the piston rod 103.

[0030] In this way, by preventing the split positions 21a and 21b of the attachment body 2 and the seal cutting portion 43 of the dust seal 42 from overlapping, leakage of liquid from the split positions 21a and 21b of the attachment body 2 and the seal cutting portion 43 of the dust seal 42 can be prevented, and the leaked liquid can be surely guided to the liquid leakage port 7 at the end of the liquid leakage flow path 6. In addition, the dust seal 42 and the crimping plate 3 are arranged in the attachment body 2 so that the seal cutting portion 43 of the dust seal 42 and the two-division position 32 of the crimping plate 3 do not overlap when viewed axially from the equipment driving fitting 107 at the tip side of the piston rod 103, for example, by an angle of 45 degrees around the axial center of the piston rod 103.

[0031] In this way, by ensuring that the seal cut portion 43 of the dust seal 42 and the two-division position 32 of the crimping plate 3 do not overlap, leakage from the seal cut portion 43 of the dust seal 42 and the two-division position 32 of the crimping plate 3 is prevented, and leakage can be reliably guided to the liquid leakage port 7 at the end of the liquid leakage flow path 6. The fluid leakage port attachment device 2 is attached to the hydraulic cylinder device 100 by threading a set screw 25, such as a pointed hexagon socket set screw, 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.

[0032] As described above, in the first embodiment of the present invention, the fluid leakage port attachment device 1 manufactured by a manufacturer can be easily attached to the hydraulic cylinder device 100 with a wrench or screwdriver at the installation site, without performing any machining on the hydraulic cylinder device 100 and without detaching the hydraulic cylinder device 100 from its drive device. Next, a second embodiment of the present invention will be described.

[0033] The second embodiment is a hydraulic cylinder device equipped with a liquid leakage port attaching device 1, as shown in FIG. In FIG. 1, 108 is a fixed flange, 109 is a tie rod, and 110 is a nut, and in FIG. 2(c), 111 is a piston packing, 112 is a cylinder tube gasket, 113 is a bush gasket, 114 is a rod packing, and 115 is a dust packing.

[0034] Next, a modification of the first embodiment of the present invention will be described. In the first embodiment, the attached main body 2 was divided into a first divided attached main body 2a and a second divided attached main body 2b at the axial center position of the piston rod 103 and perpendicular to the virtual extension line of the liquid leakage flow path 6. However, it may intersect rather than being perpendicular to the virtual extension line of the liquid leakage flow path 6.

[0035] Also, in the first embodiment, the divided positions 21a and 21b of the attached main body 2 and the seal cutting portion 43 of the dust seal 42 are arranged such that when viewed axially from the tip side of the piston rod 103, the dust seal 42 is mounted in the annular groove 41 of the attached main body 2 so as not to overlap. However, they may overlap. Also, in the first embodiment, the seal cutting portion 43 of the dust seal 42 and the divided position 32 of the crimping plate 3 are arranged such that when viewed axially from the tip side of the piston rod 103, the dust seal 42 and the crimping plate 3 are arranged on the attached main body 2 so as not to overlap. However, they may overlap.

[0036] Furthermore, in the first embodiment, the gasket interposed between the divided surfaces 21a and 21b of the attached main body 2 is formed from a silicone RTV gasket (room temperature curable liquid gasket). However, various other gaskets may also be used.

Explanation of Reference Numerals

[0037] 1 Liquid leakage port attachment device for hydraulic cylinder device 2 Attached main body 2a First divided attached main body 2b Second divided attached main body 21a First divided surface (division position) 21b Second divided surface (division position) 22 Gasket (liquid gasket) 3 Crimping plate 3a First divided crimping plate 3b Second divided crimping plate 32 Division position of crimping plate 4 Inner peripheral portion 41 Annular groove 42 Dust seal 43 Seal cutting portion 5 Fitting part 51 O-ring groove 52 O-ring 53 Ring cutting part 6 Leakage flow path 7 Leakage port 100 Hydraulic cylinder device 101 Cylinder tube 102 Piston 103 Piston rod 103a Extended part 104 Rod bush 104a Outer peripheral surface 105 Rod side cover 106 Head side cover

Claims

1. A liquid leakage port attachment device attachable to a hydraulic cylinder device including a cylinder tube, a piston, a piston rod, a rod bush, a rod side cover, and a head side cover, wherein the piston rod extends through the rod bush. In the liquid leakage port attachment device, an attachment body is formed, which includes an inner peripheral portion slidable with respect to an extending portion of the piston rod from the rod bush, a fitting portion into which an outer peripheral surface of the rod bush can be fitted, a dust seal mounted in an annular groove of the inner peripheral portion, an O-ring mounted in an O-ring groove of the fitting portion, a liquid leakage flow path for guiding liquid leakage formed between the annular groove and the O-ring groove through between the dust seal and the O-ring from the extending portion, and a liquid leakage port at an end of the liquid leakage flow path. A crimping plate for crimping the dust seal to the annular groove is attached to the attachment body to form the liquid leakage port attachment device. The attachment body intersects a virtual extension line of the liquid leakage flow path, and the attachment body is divided into two in a plane including a central axis of the piston rod. The crimping plate is also divided into two in a plane including the central axis of the piston rod. The dust seal is formed with a seal cutting portion for mounting the dust seal to the annular groove over the piston rod, and the O-ring is formed with a ring cutting portion for mounting the O-ring to the O-ring groove over the rod bush. The liquid leakage port attachment device for a hydraulic cylinder device, characterized in that, in a state where the two divided attachment bodies are integrated via a gasket at the divided surfaces, the seal cutting portion is widened to mount the dust seal to the annular groove over the piston rod, the two divided crimping plates are attached, and the ring cutting portion is widened to mount the O-ring to the O-ring groove over the rod bush.

2. The liquid leakage port attachment device for a hydraulic cylinder device according to claim 1, characterized in that when viewed axially in perspective from the tip side of the piston rod, the dust seal is mounted to the annular groove of the attachment body so as not to overlap with the divided position of the attachment body and the seal cutting portion of the dust seal.

3. The dust seal and the crimping plate are arranged on the attachment body such that the seal cutting portion of the dust seal and the two-part position of the crimping plate do not overlap when viewed axially through the tip side of the piston rod. The liquid leakage port attachment device for a hydraulic cylinder device according to claim 1 or 2, characterized in that.

4. The gasket interposed between the split surfaces of the attachment body is formed from a liquid gasket. The liquid leakage port attachment device for a hydraulic cylinder device according to any one of claims 1 to 3, characterized in that.

5. A liquid leakage port attachment device for a hydraulic cylinder device according to any one of claims 1 to 4 is attached to a hydraulic cylinder A hydraulic cylinder device, characterized in that it is attached to the device.

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