JP7372674B2 - Clamping device and swing clamp - Google Patents

Description

The present disclosure relates to clamp devices and swing clamps.

As a clamp device for fixing a workpiece, Japanese Patent Application Publication No. 2004-360718 (Patent Document 1), International Publication No. 2005/75867 (Patent Document 2), US Patent No. 5,695,177 (Patent Document 3), and Examples include those described in Publication No. 2000-145724 (Patent Document 4). In the clamp devices described in Patent Documents 1 to 4, a flow rate adjustment valve is provided to adjust the flow rate of the working fluid supplied to the cylinder or the working fluid discharged from the cylinder.

Japanese Patent Application Publication No. 2004-360718 International Publication No. 2005/75867 US Patent No. 5,695,177 Japanese Patent Application Publication No. 2000-145724

As the planar dimension of the clamp device mounted on the base increases, the base also increases in size. When multiple clamp devices are installed on one base, if the planar dimensions of the individual clamp devices increase, the entire device including the base will be affected by the increased dimensions of the multiple clamp devices, resulting in an increase in size. Cheap. As in Patent Documents 1 and 2, when the flow rate regulating valve is installed in a direction perpendicular to the axial direction of the output rod from just beside the clamp body, the planar dimensions of the clamp device tend to become large.

From a different perspective than the above, it is required to improve the operability of the flow rate regulating valve. In the case of a structure in which the flow rate adjustment valve is operated from directly above the clamp device on the base, as in Patent Documents 3 and 4, the clamp arm may interfere and it may be difficult to operate the flow rate adjustment valve. For example, this problem is particularly likely to occur in swing clamps in which the clamp arm pivots.

An object of the present disclosure is to provide a clamp device and a swing clamp that can improve the operability of a flow rate regulating valve and downsize the entire device including the base.

The clamp device according to the present disclosure includes a clamp body in which a cylinder hole is formed, and an output rod that has a clamp arm attachment portion at the distal end, is fitted into the cylinder hole, and is provided in the clamp body so as to be movable back and forth. , a fluid pressure cylinder that drives the output rod, and a flow rate adjustment valve that is attached to the clamp body and adjusts the flow rate of working fluid supplied to the fluid pressure cylinder or discharged from the fluid pressure cylinder. Equipped with.

In one aspect, the swing clamp according to the present disclosure includes a clamp body in which a cylinder hole is formed, and a clamp arm attachment portion at a distal end thereof, and the swing clamp is fitted into the cylinder hole so as to be movable in and out of the clamp body. a hydraulic cylinder that drives the output rod toward the retraction side; a rotation mechanism that rotates the output rod driven by the fluid pressure cylinder; and a flow rate regulating valve that adjusts the flow rate of the working fluid when the working fluid is supplied to the fluid pressure cylinder and opens the bypass passage when the working fluid is discharged from the hydraulic cylinder.

In another aspect, the swing clamp according to the present disclosure has a clamp body in which a cylinder hole is formed, and a clamp arm attachment part at the tip, which is fitted into the cylinder hole and is provided so as to be movable in and out of the clamp body. a hydraulic cylinder that drives the output rod toward the advancing side; a rotation mechanism that rotates the output rod driven by the fluid pressure cylinder; A flow rate regulating valve is provided which adjusts the flow rate of the working fluid when the working fluid is discharged and opens the bypass passage when the working fluid is supplied to the fluid pressure cylinder.

In the clamp device and swing clamp, the clamp body has an installation surface that comes into contact with the upper surface of the base, and extends obliquely to the installation surface in a direction that approaches the axis of the output rod as it moves away from the installation surface. a fluid pressure port provided on the installation surface; a mounting hole provided on the slope to which the flow rate adjustment valve is mounted; and a fluid pressure port extending from the fluid pressure port through the mounting hole. and a fluid path leading to the cylinder hole.

In the clamp device and the swing clamp, the fluid path includes a first fluid path connected to the fluid pressure port and opening on the outer peripheral surface of the mounting hole, and a first fluid path connected to the tip of the mounting hole and connected to the axis of the mounting hole. It includes a second fluid path extending along the center direction, and a third fluid path connected to the cylinder hole side of the second fluid path. The first fluid path intersects with the axial direction of the mounting hole at an acute angle, and the third fluid path intersects with the second fluid path at an acute angle.

In one embodiment, in the swing clamp, the flow rate adjustment valve is provided such that one end thereof protrudes from the inclined surface to the outside of the clamp body.

In one embodiment, in the swing clamp, the flow rate adjustment valve has a small diameter portion on the back side of the mounting hole and a base portion on the inclined surface side of the clamp body, and the small diameter portion is located on the back side of the mounting hole. a valve case that is internally screwed into the valve case and has the base protruding outside the inclined surface; A valve member having a relatively movable valve body portion and a shaft portion connected to a base end of the valve body portion, and capable of adjusting a gap between the valve body portion and the valve hole, and a flow direction of the working fluid. and a check valve that can switch between closing and opening the bypass flow path.

In one embodiment, the swing clamp further includes a clamp arm that is connected to the clamp arm attachment portion and cantilevered by the output rod. The flow rate adjustment valve is provided outside the pivotable angle of the clamp arm when viewed from the axial direction of the output rod.

According to the present disclosure, it is possible to improve the operability of the flow rate regulating valve and to downsize the entire device including the clamp device.

FIG. 3 is a diagram showing the arrangement of a plurality of swing clamps that fix a workpiece placed on a base. FIG. 2 is a diagram of the state shown in FIG. 1 viewed from above. 3 is a view of the clamped state viewed from the direction of arrow A in FIG. 2. FIG. FIG. 3 is a view of the unclamped state viewed from the direction of arrow A in FIG. 2. FIG. 3 is a sectional view taken along line VV in FIG. 2. FIG. 3 is a sectional view taken along line VI-VI in FIG. 2. FIG. It is a perspective view showing an output rod. 7 is a cross-sectional view taken along line VIII-VIII in FIGS. 5 and 6. FIG. It is a figure which shows the fully open state of the meter-in control flow regulating valve. FIG. 3 is a diagram showing a fully closed state of a meter-in control flow rate adjustment valve. It is a figure which shows the fully open state of the flow rate adjustment valve of meter-out control.

Embodiments of the present disclosure will be described below. Note that the same reference numerals may be given to the same or corresponding parts, and the description thereof may not be repeated.

Note that in the embodiments described below, when referring to the number, amount, etc., the scope of the present disclosure is not necessarily limited to the number, amount, etc., unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present disclosure unless otherwise specified.

In this specification, the moving direction of the output rod of the clamp device is referred to as the "up-down direction." Here, the advancing side of the output rod is "upper side" or "upper side," and the retracting side of the output rod is "lower side" or "downward."

The clamp device according to the present disclosure can be used not only in a mode in which the output rod moves in a vertical direction, but also in a mode in which the output rod moves in a horizontal direction or an oblique direction. When the clamp device is used in a manner in which the output rod moves horizontally or diagonally, the "vertical direction" as used herein corresponds to the direction of movement of the output rod.

In this embodiment, an example of a "hydraulic cylinder" will be described as an example of a "fluid pressure cylinder." However, in the present disclosure, "fluid pressure" is not limited to "hydraulic pressure" and includes "pneumatic pressure." Further, in this embodiment, a "double-acting" "fluid pressure cylinder" in which both the movement of the output rod toward the advancing side and the movement toward the retracting side are performed using fluid pressure will be described. ``Fluid pressure cylinder'' also includes ``single-acting'' ``hydraulic cylinder'' that uses fluid pressure to perform only one of the movements toward the advancing side and the movement toward the retracting side, and the other by the urging force of an elastic member, etc. .

In this embodiment, an example of a "swing clamp" as an example of a "clamp device" will be described, but in the present disclosure, the "clamp device" is not limited to a "swing clamp" and also includes a "link clamp" and the like.

In this embodiment, an example including a "bypass channel" will be described as an example of a "flow rate adjustment valve," but the "flow rate adjustment valve" in the present disclosure is not limited to this.

In this specification, "meter-in" means that when discharging working fluid from the cylinder hole, the check valve opens and the bypass flow path is opened, and when working fluid is supplied to the cylinder hole, the bypass flow path is not opened and the valve opens. This means that the flow rate is adjusted by the gap between the body and the valve hole.

In this specification, "meter-out" means that the check valve opens and the bypass flow path is opened when working fluid is supplied to the cylinder hole, and the bypass flow path is not opened when the working fluid is discharged from the cylinder hole. This means that the flow rate is adjusted by the gap between the valve body and the valve hole.

In this specification, the oil passage extends "along" the axial direction when the oil passage extends parallel to the axial direction, and when the oil passage is inclined at an angle of about 15 degrees or less with respect to the axial direction. Including when extending in the direction. In addition, in this specification, an oil passage "extends" in the axial direction when the oil passage extends in the axial direction throughout the oil passage, and when the direction of a part of the oil passage is different from the axial direction. including. When the direction of a part of the oil passage differs from the axial direction, even if the inclination angle exceeds the above-mentioned 15 degrees, if the main part of the oil passage extends along the axial direction, The oil passage should be deemed to "extend" along the axial direction. Moreover, "intersecting at an acute angle" is not limited to the intersection angle at the connecting portion of two oil passages. Even if the connecting parts of two oil passages intersect at right angles, if the directions in which the main parts of the respective oil passages "extend" intersect at acute angles, then the two oil passages are should be recognized as "crossing at an acute angle".

The manner of use of the swing clamp 1 will be explained using FIGS. 1 to 4. FIG. 1 is a diagram showing the arrangement of a plurality of swing clamps 1 for fixing a workpiece 3 placed on a base 2. As shown in FIG. FIG. 2 is a diagram of the state shown in FIG. 1 viewed from above. 3 and 4 are views of a clamped state (FIG. 3) and an unclamped state (FIG. 4) as viewed from the direction of arrow A in FIG.

As shown in Figures 1 and 2, multiple (3) swing clamps 1 are used simultaneously to secure the work 3 (object to be clamped), and the work 3 is secured at multiple (3) locations. Ru. At this time, if the supply speed (supply flow rate) of hydraulic oil to the hydraulic cylinder is different between the plurality of swing clamps 1, there will be variations in the timing at which the workpiece 3 is clamped by each swing clamp 1, and the clamping is performed first. If the workpiece 3 is tilted by the arm of the swing clamp 1, the workpiece 3 may not be securely fixed at a predetermined position.

Therefore, a flow rate adjustment valve 600 is attached to each swing clamp 1. By attaching the flow rate adjustment valves 600 (600A, 600B) to each swing clamp 1, more precise flow rate adjustment is possible.

As shown in FIGS. 1 and 2, the flow rate adjustment valve 600 is provided on the outer peripheral side of the base 2 when viewed from the axis of the output rod of each swing clamp 1. This arrangement improves the operability of the flow rate adjustment valve 600.

As shown in FIGS. 3 and 4, the clamp arm 300 that fixes the workpiece 3 rotates 90 degrees between a clamped state and an unclamped state. Since the clamp arm 300 is not located above the workpiece 3 in the unclamped state, the workpiece 3 can be easily replaced.

The flow rate adjustment valve 600 is provided at a position where the clamp arm 300 does not overlap in the vertical direction in both the clamped state (FIG. 3) and the unclamped state (FIG. 4). That is, the flow rate adjustment valve 600 is provided outside the pivotable angle of the clamp arm 300 when viewed from the vertical direction.

In the present disclosure, the pivot angle of the clamp arm 300 is not limited to 90 degrees, but may have other pivot angles, such as 30 degrees, 45 degrees, 60 degrees, and 120 degrees.

In the examples shown in FIGS. 1 to 4, two flow rate regulating valves 600A and 600B are attached to each swing clamp 1. Here, the flow rate adjustment valve 600A controls the movement of the output rod to the retraction side (clamping operation), and the flow rate adjustment valve 600B controls the movement of the output rod to the advancement side (unclamping operation).

For example, one flow rate regulating valve 600 may be attached to each swing clamp 1 so as to control the speed of only the clamping operation of the output rod. At this time, the speed of the clamping operation may be controlled by "meter-in" control of the flow path communicating with the hydraulic cylinder on the clamping side, or "meter-out" control of the flow path communicating with the hydraulic cylinder on the unclamping side. By doing so, the speed of the clamping operation may be controlled.

In the swing clamp 1, the clamp arm 300 is supported in a cantilevered manner, and there are restrictions on the operating speed, so controlling the speed of the clamping operation or unclamping operation is particularly important.

Next, the internal structure of the swing clamp 1 will be explained in more detail using FIGS. 5 to 8.

5 is a cross-sectional view taken along line VV in FIG. 2, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, the swing clamp 1 includes a clamp body 100, an output rod 200, a clamp arm 300, a hydraulic cylinder 400, a swing mechanism 500, and flow rate adjustment valves 600A and 600B.

Clamp body 100 includes a cylinder member 110 and a cap member 120. A hydraulic cylinder chamber is configured in the internal space of the cylinder member 110 and the cap member 120.

Clamp body 100 further includes an installation surface 130, an inclined surface 140, hydraulic ports 150A, 150B, mounting holes 160A, 160B, and oil passages 170A, 170B. The clamp body 100 is fixed to the base 2 with bolts (not shown).

The installation surface 130 contacts the upper surface of the base 2. The inclined surface 140 extends diagonally with respect to the installation surface 130. The inclined surface 140 extends in a direction that moves away from the installation surface 130 and approaches the axis of the output rod 200.

Hydraulic ports 150A, 150B are provided on installation surface 130. The hydraulic ports 150A and 150B communicate with oil passages 20A and 20B formed in the base 2, respectively.

Mounting holes 160A and 160B are provided on the inclined surface 140. The mounting holes 160A and 160B extend in a direction perpendicular to the inclined surface 140. Flow rate regulating valves 600A and 600B are mounted in the mounting holes 160A and 160B, respectively.

The oil passage 170A shown in FIG. 5 is a fluid passage that extends from the hydraulic port 150A to the oil chamber 410 of the hydraulic cylinder 400 via the mounting hole 160A. The oil passage 170A includes a first oil passage 171A, a second oil passage 172A, and a third oil passage 173A.

One end of the first oil passage 171A is connected to the hydraulic port 150A, and the other end of the first oil passage 171A opens to the outer peripheral surface of the mounting hole 160A. The first oil passage 171A extends along the axial direction (vertical direction) of the output rod 200.

One end of the second oil passage 172A is connected to the tip of the mounting hole 160A, and the other end of the second oil passage 172A is connected to the third oil passage 173A. The second oil passage 172A extends along the axial direction of the mounting hole 160A in a direction diagonally intersecting the vertical direction.

One end of the third oil passage 173A is connected to the second oil passage 172A, and the other end of the third oil passage 173A is connected to the hydraulic cylinder 400 (clamp side oil chamber 410). The third oil passage 173A extends along the axial direction (vertical direction) of the output rod 200.

The oil passage 170B shown in FIG. 6 is a fluid passage that extends from the hydraulic port 150B to the oil chamber 420 of the hydraulic cylinder 400 via the mounting hole 160B. Oil passage 170B includes a first oil passage 171B, a second oil passage 172B, and a third oil passage 173B.

One end of the first oil passage 171B is connected to the hydraulic port 150B, and the other end of the first oil passage 171B opens to the outer peripheral surface of the mounting hole 160B. The first oil passage 171B extends along the axial direction (vertical direction) of the output rod 200.

One end of the second oil passage 172B is connected to the tip of the mounting hole 160B, and the other end of the second oil passage 172B is connected to the third oil passage 173B. The second oil passage 172B extends along the axial direction of the mounting hole 160B in a direction diagonally intersecting the vertical direction.

One end of the third oil passage 173B is connected to the second oil passage 172B, and the other end of the third oil passage 173B is connected to the hydraulic cylinder 400 (oil chamber 420 on the unclamp side). The third oil passage 173B extends along the axial direction (vertical direction) of the output rod 200.

As shown in FIGS. 5 and 6, the oil passages 170A and 170B are arranged to form a substantially Z-shaped flow passage together with the mounting holes 160A and 160B. The first oil passages 171A, 171B intersect at an acute angle with respect to the axial direction of the mounting holes 160A, 160B, and the third oil passages 173A, 173B intersect at an acute angle with respect to the second oil passages 172A, 172B.

In the swing clamp 1 according to the present embodiment, the flow rate regulating valves 600 (600A, 600B) are provided so as to be inclined obliquely with respect to the direction (horizontal direction) perpendicular to the axis of the output rod 200. Therefore, compared to the case where the flow rate regulating valve 600 is provided horizontally, the planar dimension (the size in the horizontal direction in the figure) of the cylinder member 110 can be reduced. As a result, the entire device including the base 2 can be downsized.

Further, since the flow rate adjustment valve 600 can be operated diagonally from above to adjust the flow rate, good operability is also ensured.

Furthermore, since the structure is not such that a part of the clamp body 100 is embedded in the base 2, and the lower surface of the clamp body 100 becomes the installation surface 130, the base 2 has a bolt hole for fixing the clamp body 100 and an oil passage 20A. , 20B. As a result, the versatility of the jig design is improved and the thickness of the base 2 can be reduced.

The output rod 200 is fitted into a cylinder hole of the clamp body 100 and is provided so as to be movable forward and backward with respect to the clamp body 100.

The clamp arm 300 rotates in conjunction with the rotation of the output rod 200, comes into contact with the workpiece 3 as the output rod 200 moves in and out, and clamps the workpiece 3.

Hydraulic cylinder 400 drives output rod 200 in forward and backward directions. Hydraulic cylinder 400 includes oil chambers 410 and 420. By supplying hydraulic pressure to the oil chamber 410, the output rod 200 moves to the retraction side. By supplying hydraulic pressure to the oil chamber 420, the output rod 200 moves to the advancing side.

The turning mechanism 500 converts a portion of the forward and backward movement of the output rod 200 into a rotating movement with respect to the clamp body 100 in order to turn the clamp arm 300. The turning mechanism 500 includes a cam groove 510 formed on the outer circumference of the output rod 200 and a ball 520 held in the clamp body 100. Each of the balls 520 partially engages the cam groove 510.

The flow rate adjustment valve 600A shown in FIG. 5 adjusts the flow rate of hydraulic oil supplied to the oil chamber 410. When the hydraulic oil is discharged from the oil chamber 410, a bypass passage, which will be described later, is opened. As a result, the hydraulic oil is quickly discharged from the oil chamber 410. That is, the flow rate adjustment valve 600A performs "meter-in" control.

A flow rate adjustment valve 600B shown in FIG. 6 adjusts the flow rate of hydraulic oil supplied to the oil chamber 420. When the hydraulic oil is discharged from the oil chamber 420, a bypass passage, which will be described later, is opened. As a result, the hydraulic oil is quickly discharged from the oil chamber 420. That is, the flow rate adjustment valve 600B performs "meter-in" control.

Next, the output rod 200 and the turning mechanism 500 will be explained in more detail using FIGS. 7 and 8. 7 is a perspective view showing the output rod 200, and FIG. 8 is a sectional view taken along line VIII-VIII in FIGS. 5 and 6.

The output rod 200 includes a first sliding part 210 on the upper side, a second sliding part 220 on the lower side, an intermediate part 230 formed between the first sliding part 210 and the second sliding part 220, and It includes a piston 240 and a clamp arm attachment part 250 formed at the upper end.

The first sliding portion 210 is slidably supported by the upper end of the cylinder member 110. The second sliding portion 220 is slidably supported by the cap member 120. The intermediate portion 230 is formed to have a smaller diameter than the second sliding portion 220 and is not slidably supported by the cap member 120. Piston 240 is fitted into the middle portion of cylinder member 110 . Piston 240 partitions oil chamber 410 and oil chamber 420 of hydraulic cylinder 400 . A clamp arm 300 is attached to the clamp arm attachment portion 250.

When the clamp arm 300 clamps the workpiece 3, a bending moment acts on the output rod 200. At this time, the first sliding part 210 and the second sliding part 220 of the output rod 200 are supported in opposite directions. Since the intermediate portion 230 and the piston 240 have a relatively large fitting gap with respect to the first sliding portion 210 and the second sliding portion 220, the first sliding portion 210 and the piston 240 are supported when a bending moment is applied. These are the two locations of the second sliding portion 220.

By supporting the output rod 200 by the first sliding part 210 and the second sliding part 220 which are separated from each other with the intermediate part 230 and the piston 240 in between, the straightness of the output rod 200 is improved. Further, even if the clamp body 100 is made smaller by reducing the axial length of the output rod 200, the inclination of the output rod 200 when a bending moment is applied is suppressed within a predetermined range.

In the clamped state, the three balls 520 held by the cap member 120 of the clamp body 100 are partially engaged with the vertical grooves 511 of the three corresponding cam grooves 510. When the output rod 200 is driven upward by the hydraulic cylinder 400 from this state, the output rod 200 is first guided in the vertical direction by the ball 520 engaged with the vertical groove 511 and advances linearly. When the ball 520 reaches the lower end of the vertical groove 511, the ball 520 subsequently engages with the spiral groove 512 and rolls along the spiral groove 512. Therefore, a part of the advancing motion of the output rod 200 is converted into a rotating motion with respect to the cylinder member 110, and the output rod 200 advances upward while rotating 90 degrees with respect to the cylinder member 110, resulting in an unclamped state. When moving from the unclamped state to the clamped state, the operation opposite to the above is performed.

Next, the structure of the flow rate adjustment valve 600 will be explained in more detail. FIGS. 9 and 10 are diagrams showing the open and closed states of the meter-in control flow rate regulating valve 600, respectively. Note that although FIGS. 9 and 10 show the structure of the flow rate adjustment valve 600A, the flow rate adjustment valve 600B also has a similar configuration.

As shown in FIGS. 9 and 10, the mounting hole 160A extends in a direction perpendicular to the inclined surface 140 of the clamp body 100. A valve hole 180A is formed in a part (tip part) of the mounting hole 160A.

Flow rate adjustment valve 600A includes a valve case 610A, a valve member 620A, a bypass passage 630A, a check valve 640A, a lock nut 650A, and a dustproof cover 660A.

The valve case 610A is screwed into the mounting hole 160A of the cylinder member 110. The valve case 610A has a small diameter portion 611A on the back side of the mounting hole 160A, and a base portion 612A on the inclined surface 140 side of the clamp body 100. The small diameter portion 611A is internally screwed into the mounting hole 160A. The base 612A abuts the inclined surface 140 and protrudes to the outside of the inclined surface 140.

The valve member 620A includes a cylindrical valve body portion 621A formed at its distal end, a shaft portion 622A that extends from the base end of the valve body portion 621A and has a slightly larger diameter than the valve body portion 621A, and a shaft portion 622A that extends from the base end of the valve body portion 621A. It has an operating section 623A formed on the proximal end side. A threaded portion is formed on the outer periphery of the proximal end portion of the shaft portion 622A, and the shaft portion 622A is internally screwed into the valve case 610A.

Thereby, the valve member 620A is movable relative to the valve case 610A fixed to the clamp body 100 in the axial direction (back and forth direction) of the mounting hole 160A. An operating portion 623A made of a hexagonal hole is formed at the proximal end portion of the shaft portion 622A of the valve member 620A. By engaging a tool such as a hexagonal wrench with the operating portion 623A and rotating the shaft portion 622A, the valve member 620A can be moved in the front-rear direction.

The valve body portion 621A is movable from a fully open state (FIG. 9) in which it is spaced from the valve hole 180A to a fully closed state (FIG. 10) in which it is inserted into the valve hole 180A. A notch-shaped (V-shaped in front view) groove G is formed in the outer peripheral portion of the valve body portion 621A, and the depth of the groove is deeper toward the distal end.

The valve body 621A is moved back and forth between a fully open state (FIG. 9) in which the valve body 621A is at the rearmost position and a fully closed state (FIG. 10) in which the valve body 621A is in the most front position. As a result, the gap between the valve body portion 621A and the valve hole 180A changes, and the flow rate of the hydraulic oil flowing therebetween is adjusted. Furthermore, the above-mentioned groove portion G allows fine adjustment of the gap between the valve body portion 621A and the valve hole 180A.

The bypass flow path 630A is a flow path that bypasses the gap between the valve body portion 621A and the valve hole 180A. The bypass flow path 630A includes a first flow path 631A formed to extend back and forth inside the valve body portion 621A, and a first flow path 631A formed to extend radially outward from the base end of the first flow path 631A. 2 flow paths 632A.

The check valve 640A closes the bypass passage 630A only in the direction in which hydraulic oil is supplied to the hydraulic cylinder 400. The check valve 640A includes a steel ball 641A and a coil spring 642A. The coil spring 642A biases the steel ball 641A toward the front (towards the back of the mounting hole 160A).

When hydraulic oil is supplied to the hydraulic cylinder 400, the bypass flow path 630A is closed, so the hydraulic oil flows only through the gap between the valve body portion 621A and the valve hole 180A, thereby making it possible to adjust the flow rate. be done.

When discharging the hydraulic oil from the hydraulic cylinder 400, the steel ball 641A is pushed by the hydraulic pressure and the bypass passage 630A is opened. Thereby, in addition to the gap between the valve body portion 621A and the valve hole 180A, hydraulic oil flows from the bypass passage 630A to the hydraulic port 150A side.

The lock nut 650A is attached to the base end side of the shaft portion 622A as a member for preventing the valve member 620A from coming off. The dustproof cover 660A is removably provided so as to cover the valve case 610A and the valve member 620A exposed to the outside from the clamp body 100.

FIG. 11 is a diagram showing the open state of the meter-out control flow rate adjustment valve 600C. As shown in FIG. 11, the meter-out control flow rate adjustment valve 600C has the same basic structure as the meter-in control flow rate adjustment valve 600A. However, in the flow rate adjustment valve 600C, the coil spring 642C of the check valve 640C biases the steel ball 641C toward the rear side (outside the mounting hole 160C).

When the hydraulic oil is discharged from the hydraulic cylinder 400, the bypass flow path 630C is closed, so the hydraulic oil flows only through the gap between the valve body portion 621C and the valve hole 180C, and thereby the flow rate can be adjusted. be done.

When hydraulic oil is supplied to the hydraulic cylinder 400, the steel ball 641C is pushed by the hydraulic pressure, and the bypass passage 630C (631C, 632C) is opened. As a result, hydraulic oil flows not only through the gap between the valve body portion 621C and the valve hole 180C but also through the bypass passage 630C.

The flow rate adjustment valve structure is not limited to the one described above, and for example, the valve hole may be formed not in the clamp body but in a member constituting the flow rate adjustment valve. Alternatively, the flow rate regulating valve may be provided without a valve case. In addition, according to the flow rate adjustment valve 600 according to the present embodiment, by providing the valve case and making the base portion protrude to the outside of the clamp body 100, a part of the valve member can also be made to protrude to the outside of the clamp body 100. I can do it. Thereby, the clamp main body 100 can be downsized while ensuring the movement distance of the valve member for flow rate adjustment.

Although the embodiments of the present disclosure have been described above, the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the claims, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1 swing clamp, 2 base, 3 work, 20A, 20B oil passage, 100 clamp body, 110 cylinder member, 120 cap member, 130 installation surface, 140 inclined surface, 150A, 150B hydraulic port, 160A, 160B, 160C mounting hole, 170A, 170B, 170C Oil passage, 171A, 171B, 171C First oil passage, 172A, 172B, 172C Second oil passage, 173A, 173B, 173C Third oil passage, 180A, 180C Valve hole, 200 Output rod, 210 No. 1 Sliding part, 220 Second sliding part, 230 Intermediate part, 240 Piston, 250 Clamp arm mounting part, 300 Clamp arm, 400 Hydraulic cylinder, 410, 420 Oil chamber, 500 Swivel mechanism, 510 Cam groove, 511 Vertical groove , 512 Spiral groove, 520 Ball, 600, 600A, 600B, 600C Flow rate adjustment valve, 610A, 610C Valve case, 611A, 611C Small diameter part, 612A, 612C Base, 620A, 620C Valve member, 621A, 621C Valve body part, 622A , 622C Shaft, 623A, 623C Operating section, 630A, 630C Bypass passage, 631A, 631C First passage, 632A, 632C Second passage, 640A, 640C Check valve, 641A, 641C Steel ball, 642A, 642C Coil spring, 650A, 650C lock nut, 660A, 660C dust cover.

Claims (6)

A clamp body with a cylinder hole formed therein;
an output rod that has a clamp arm attachment part at its tip, is fitted into the cylinder hole, and is provided in the clamp body so that it can move forward and backward;
a fluid pressure cylinder that drives the output rod;
a flow rate adjustment valve attached to the clamp body and adjusting the flow rate of the working fluid supplied to the fluid pressure cylinder or the working fluid discharged from the fluid pressure cylinder;
The clamp body is
an installation surface that comes into contact with the top surface of the base;
an inclined surface that extends obliquely to the installation surface and extends in a direction that approaches the axis of the output rod as it moves away from the installation surface;
a fluid pressure port provided on the installation surface;
a mounting hole provided on the inclined surface and into which the flow rate adjustment valve is mounted;
a fluid path extending from the fluid pressure port to the cylinder hole via the mounting hole;
The fluid path is
a first fluid path connected to the fluid pressure port and opening to the outer peripheral surface of the mounting hole;
a second fluid path connected to the tip of the mounting hole and extending along the axial direction of the mounting hole;
a third fluid path connected to the cylinder hole side of the second fluid path,
the first fluid path intersects at an acute angle with respect to the axial direction of the mounting hole;
The third fluid path intersects the second fluid path at an acute angle. A clamp body with a cylinder hole formed therein;
an output rod that has a clamp arm attachment part at its tip, is fitted into the cylinder hole, and is provided in the clamp body so that it can move forward and backward;
a fluid pressure cylinder that drives the output rod toward the retraction side;
a turning mechanism that turns the output rod driven by the fluid pressure cylinder;
A flow rate adjustment device attached to the clamp body, which adjusts the flow rate of the working fluid when the working fluid is supplied to the fluid pressure cylinder, and opens a bypass flow path when the working fluid is discharged from the fluid pressure cylinder. and a valve;
The clamp body is
an installation surface that comes into contact with the top surface of the base;
an inclined surface extending obliquely to the installation surface and extending in a direction that approaches the axis of the output rod as it moves away from the installation surface;
a fluid pressure port provided on the installation surface;
a mounting hole provided on the inclined surface and into which the flow rate adjustment valve is mounted;
a fluid path extending from the fluid pressure port to the cylinder hole via the mounting hole;
The fluid path is
a first fluid path connected to the fluid pressure port and opening to the outer peripheral surface of the mounting hole;
a second fluid path connected to the tip of the mounting hole and extending along the axial direction of the mounting hole;
a third fluid path connected to the cylinder hole side of the second fluid path,
the first fluid path intersects at an acute angle with respect to the axial direction of the mounting hole;
The third fluid path intersects the second fluid path at an acute angle. A clamp body with a cylinder hole formed therein;
an output rod that has a clamp arm attachment part at its tip, is fitted into the cylinder hole, and is provided so as to be movable in and out of the clamp body;
a fluid pressure cylinder that drives the output rod toward the advancing side;
a turning mechanism that turns the output rod driven by the fluid pressure cylinder;
A flow rate adjustment device attached to the clamp body, which adjusts the flow rate of the working fluid when the working fluid is discharged from the fluid pressure cylinder, and opens a bypass flow path when the working fluid is supplied to the fluid pressure cylinder. and a valve;
The clamp body is
an installation surface that comes into contact with the top surface of the base;
an inclined surface extending obliquely to the installation surface and extending in a direction that approaches the axis of the output rod as it moves away from the installation surface;
a fluid pressure port provided on the installation surface;
a mounting hole provided on the inclined surface and into which the flow rate adjustment valve is mounted;
a fluid path extending from the fluid pressure port to the cylinder hole via the mounting hole;
The fluid path is
a first fluid path connected to the fluid pressure port and opening to the outer peripheral surface of the mounting hole;
a second fluid path connected to the tip of the mounting hole and extending along the axial direction of the mounting hole;
a third fluid path connected to the cylinder hole side of the second fluid path,
the first fluid path intersects at an acute angle with respect to the axial direction of the mounting hole;
The third fluid path intersects the second fluid path at an acute angle. The swing clamp according to claim 2 or 3, wherein the flow rate adjustment valve is provided such that one end thereof projects from the inclined surface to the outside of the clamp body. The flow rate adjustment valve is
It has a small diameter part on the back side of the mounting hole and a base part on the slope side of the clamp body, the small diameter part is internally screwed into the mounting hole, and the base part is on the outside of the slope surface. a valve case that protrudes into the
The valve body has a valve body part that is internally fitted into the valve case and is movable relative to the clamp body in the axial direction of the mounting hole, and a shaft part that is connected to a base end of the valve body part, a valve member capable of adjusting a gap between the valve body portion and the valve hole;
The swing clamp according to any one of claims 2 to 4, further comprising a check valve that can switch between closing and opening the bypass flow path depending on the flow direction of the working fluid. further comprising a clamp arm connected to the clamp arm attachment part and cantilevered by the output rod,
The swing clamp according to any one of claims 2 to 5, wherein the flow rate adjustment valve is provided outside a pivotable angle of the clamp arm when viewed from the axial direction of the output rod.

Images