JPH1119836A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a clamp device free from maintenance even under an environment of much foreign matter of cutting chip, dust, etc. SOLUTION: In a hollow space H opened to an upper end of a housing 11, a piston 20 is inserted, in a tubular hole 20a of this piston 20, a transmitting sleeve 24 is inserted. In a tubular hole 24b of this sleeve 24, a cover member 44 is inserted. By pressing this cover member 44 in an upward direction by an advancing spring 45, with this cover member 44, an upper end part of the tubular hole 24b is covered. At clamp time, against pressing force of the spring 45, a clamp rod 3 is inserted in the tubular hole 24b, an engaged part 5 of this clamp rod 3 is pulled downward successively through the piston 20, transmitting sleeve 24 and an engaging ball 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for fixing an object such as a work piece or a mold to a work pallet or a table.

[0002]

BACKGROUND OF THE INVENTION A clamping device to which the present invention is directed is disclosed, for example, in Japanese Patent Application Laid-Open No. H8-210, filed by the present inventors prior to the present invention.
As shown in No. 100576, this is a device of a type for pulling a clamp rod. The device of the prior invention is configured as follows. A clamp rod is fixed to a surface to be fixed, such as a workpiece, and a receiving passage for the clamp rod is opened at a first end of the housing. At the time of clamping, the clamped rod is inserted into the receiving passage, and the clamp rod is pulled to the second end of the housing by a clamping mechanism, thereby fixing the fixed surface to the housing.

The above-mentioned apparatus of the prior invention is excellent in that it can be clamped in a state where five of the six surfaces of the object to be fixed except for the surface to be clamped are opened, but there is room for improvement in the following points. It had been. That is, in an unclamped state in which the clamp rod is removed from the receiving passage of the housing, the first end of the receiving passage is opened to the external space of the housing. For this reason, in an environment where there are many foreign substances such as cutting chips, dust and cutting oil, the foreign substances may enter the housing through the above-described receiving path, and the maintenance device must be used for a long time without maintenance. Is difficult. An object of the present invention is to enable the clamp device to be used for a long period without maintenance.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, as shown in FIGS. 1 to 6, for example, a clamping device is constituted as follows. An apparatus for pulling and clamping a clamp rod (3) inserted in a housing (11), comprising a receiving path (P) opened at a first end of the housing (11) and an axially movably inserted into the receiving path (P). A cover member 44 for covering the first end of the receiving path P, and an advancing means 45 for pressing the lid member 44 to the first end of the receiving path P; The clamp rod 3 can be inserted into the clamping position in the receiving path P against the pressing force of 45, and the clamp rod 3 is pulled to the second end of the housing 11 by the clamping mechanism M. It is what was constituted.

[0005] The first aspect of the present invention has the following operational effects, for example, as shown in FIGS. FIG.
In the clamped state, the clamp rod 3 is inserted into the receiving path P of the housing 11 against the upward force of the advancing means 45, and the clamp rod 3 is
Has been pulled downwards. As a result, the fixed object 1 such as a workpiece is
Is fixed to the support surface S at the upper end of the housing 11. As shown in the unclamped state in FIG. 1, when the clamp rod 3 is pulled out from the receiving path P of the housing 11, the advancement means 45 causes the cover member 44 to advance upward, and Lid member 44
Covers the upper end of the receiving path P.

Accordingly, it is possible to prevent foreign matters such as chips, dust and cutting oil in the outer space of the housing from entering the housing through the receiving path. As a result, the clamp device can be used for a long period without maintenance. Moreover, in the above-described clamped state, five of the six surfaces of the object to be fixed, excluding the surface to be fixed, can be opened. Therefore, when the object to be fixed is a work piece, the above-described five surfaces can be continuously processed in the clamped state, and the efficiency of machining is high. Further, when the object to be fixed is a mold, the space around the mold is not narrowed, so that the workability at the time of mold replacement is good.

According to a second aspect of the present invention, the following configuration is added to the configuration of the first aspect. A transmission sleeve 24 is axially movably inserted into a hollow space H opened at the first end of the housing 11, and at least a part of the receiving path P is formed by a cylindrical hole 24b of the transmission sleeve 24. The cover member 44 is inserted into the cylindrical hole 24b so as to be movable in the axial direction, and the cover member 4
4 is pressed against the first end by the advancing means 45 so that the cover member 44 allows the cylindrical hole 24 to be pressed.
b, and covers the transmission sleeve 24 with respect to the operating tool 36 provided on the housing 11 by the driving means D.
By reciprocating in the axial direction, the engaging member 37 supported on the first end of the transmission sleeve 24 is engaged with the engaged portion 5 of the clamp rod 3 by the engaging position X.
Disengagement position Y for disengaging engagement with engaged portion 5
It was configured to be switchable to and.

The invention of claim 2 has the following effects. As shown in FIG. 1, when the clamp rod 3 starts to be inserted into the cylindrical hole 24 b of the transmission sleeve 24, the transmission sleeve 24 is moved upward by the driving means D, that is, the first end side, and the engagement member 37 is moved. Are switched to the disengagement position Y. When the clamp rod 3 is lowered from the state shown in FIG. 1, as shown in FIG.
Is lowered, and the clamp rod 3 is inserted into the cylindrical hole 24b.
It is inserted in.

Next, the drive sleeve D is used to drive the transmission sleeve 24 downward, that is, at the second end. Then
As shown in FIG. 5, the engagement member 37 supported by the transmission sleeve 24 is switched to the engagement position X and engages with the engaged portion 5 of the clamp rod 3. As a result, the driving force of the driving means D is transmitted between the transmission sleeve 24 and the engaging member 3.
7 and the clamp rod 3 are transmitted to the fixed object 1 in this order, and the fixed surface R of the fixed object 1
1 is fixed to the support surface S. As described above, since the driving force of the driving means can be reliably transmitted to the clamp rod via the transmission sleeve and the engagement member, a strong clamping force can be obtained.

The invention of claim 3 is the one obtained by adding the following structure to the structure of claim 2 described above. A guide hole 17 is formed in a peripheral wall of the hollow space H of the housing 11,
An annular driving member 20 is inserted into the second end portion of the guide hole 17 so as to be movable in the axial direction, and a first annular gap 21 is formed in the cylindrical hole 20a of the driving member 20 to thereby dispose the transmission sleeve 24. And insert the second end into the first end of the guide hole 17.
The operating tool 36 was inserted with the annular gap 22 left.

The third aspect of the present invention has the following effects. When the object 1 is lowered from the state shown in FIG. 1, first, the lower end of the clamp rod 3 is inserted into the cylindrical hole 24b of the transmission sleeve 24. When the axis A of the guide hole 17 is misaligned with the axis B of the clamp rod 3 at the start of insertion of the rod 3, the transmission sleeve is provided by the presence of the two annular gaps 21 and 22. The above-described misalignment is automatically corrected by moving the operation tool 24 and the operating tool 36 in the horizontal direction.

As a result, as shown in FIG. 4, the clamp rod 3 is smoothly inserted into the cylindrical hole 24b of the transmission sleeve 24, and the fixed surface R of the fixed object 1 is received by the housing 11. As described above, even when the axis of the guide hole of the clamp device is misaligned with the axis of the rod of the fixed object, the above-described misalignment can be automatically corrected. Connection can be performed smoothly.

[0013] The invention of claim 4 provides the above-mentioned claims 1 to 3
In any of the configurations described above, a supply port 47 for the cleaning fluid is provided in the housing 11, and the supply port 47 communicates with the ejection port 49 through the communication passage 51.
9 is directed to the first end of the lid member 44.

The invention of claim 4 has the following effects. At the time of the above-described clamping connection operation, the cleaning fluid supplied to the supply port 47 is vigorously discharged from the ejection port 49 as shown by a broken arrow in FIG. Then, the upper part of the lid member 44 and the clamp rod 3
Foreign matter, such as dust and swarf, adhering to the lower part of the cleaning fluid is blown away by the discharged cleaning fluid and cleaned. Further, when the clamp rod 3 is being inserted into the receiving path P, the receiving path P
Since the gap between the outer peripheral surface of the clamp rod 3 and the outer peripheral surface of the clamp rod 3 is narrowed, the cleaning fluid flows vigorously through the gap, and the outer peripheral surface of the clamp rod 3 is sufficiently cleaned. For this reason, the engagement error of the clamp rod 3 can be prevented.

According to a fifth aspect of the present invention, the second hole formed between the guide hole 17 and the operation tool 36 is provided.
When a part of the communication path 51 is constituted by the annular gap 22, the second annular gap can also be used as a path for the cleaning fluid. Therefore, at least a part of the dedicated cleaning path is omitted, and the cleaning mechanism is omitted. Can be simplified.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the clamp device of the present invention will be described below with reference to FIGS. First, FIG.
3 to 3, a procedure for clamping an object to be fixed by the clamp device will be described.

In FIG. 2, reference numeral 1 denotes a work piece (an object to be processed) to be processed by a machining center.
At 1, the reference surface (fixed surface) R is machined in advance on the upper surface of the front, rear, upper, lower, left and right surfaces of the workpiece 1.
Next, a plurality of female screw holes 2 are formed in the reference plane R,
Thereafter, the clamp rod 3 is detachably screwed into each of the female screw holes 2 manually or by a robot. At the tip of the clamp rod 3, a hexagonal screwdriver portion 4 and an engaged portion 5 described later are provided.

In FIG. 3, reference numeral 7 denotes a work pallet for supporting an object to be fixed. The work pallet 7 is provided with a plurality of through holes 8 (only two are shown here), and the housing 11 of the clamp device 10 is inserted into the through holes 8 from above. The housing 11 is fixed on the upper surface of the work pallet 7. The upper surface of the housing 11 forms a support surface S.

When the work piece 1 is fixed to the pallet 7, first, as shown in FIG.
The work piece 1 having the above posture is turned upside down (see FIG. 1), and in this state, the clamp rods 3.3 are inserted into the housing 11 and the support surface S of the housing 11 The reference plane R is received. Next, the clamp device 10 is driven to be clamped. Then, the clamp rods 3, 3 are pulled downward by a clamping mechanism M described later provided in the housing 11, and the workpiece 1 is fixed to the support surface S. Subsequently, the pallet 7 is carried into the machining center, and thereafter, five of the six surfaces of the workpiece 1 excluding the reference surface R are continuously processed by the machining center.

When the above processing is completed, first, the work pallet 7 is unloaded from the machining center, and then
The work piece 1 is detached from the pallet 7 by releasing the clamp state, and then the clamp rods 3 are detached from the work piece 1.

Next, the detailed structure of the clamp device 10 will be described with reference to the plan views of FIGS. The housing 11 of the clamp device 10 includes a lower housing portion 12 fitted into the through hole 8 and an upper housing portion 13 fixed to an upper portion of the lower housing portion 12 by four short bolts 14. The lower housing portion 12 is fixed to the work pallet 7 by four long bolts 15.

A guide hole 17 extending in the vertical direction is formed in the peripheral wall of the hollow space H of the housing 11. The guide hole 17 includes an upper hole 18 formed in the upper housing portion 13 and a lower hole 19 formed in the lower housing portion 12, and the upper end (first end) of the upper hole 18 is opened upward. The symbol A in FIG.
Reference numeral B in FIG. 1 indicates the axis of the clamp rod 3.

An annular piston 20, which is a driving member, is inserted into the lower hole 19 of the guide hole 17 so as to be able to move hermetically in the axial direction. The transmission sleeve 24 is inserted into the cylindrical hole 20a of the piston 20 with a first annular gap 21 therebetween. A hydraulic working chamber 27 is formed between the upper and lower O-rings 25 and 26 above the piston 20. Reference numeral 28 denotes a pressure oil supply / discharge port, and reference numeral 29 denotes a dust seal.

When pressure oil is supplied to the working chamber 27, the transmission sleeve 24 is moved downward by the piston 20 via the flange 24a. Conversely, when the hydraulic oil is discharged from the working chamber 27, the piston 20 is moved upward by the first return spring 31, and the transmission sleeve 24 is moved to the second return spring 3 by the first return spring 31.
It is moved upward by 2. That is, the transmission sleeve 2
The fourth driving means D includes the piston 20, the working chamber 27, and two return springs 31 and 32. The urging force of the second return spring 32 is set to a value smaller than the urging force of the first return spring 31. Thereby, the transmission sleeve 24 can move lightly in the radial direction in the cylindrical hole 20a of the piston 20.

A ring-shaped operating tool 36 is inserted into the upper portion of the lower hole 19 of the guide hole 17 with a second annular gap 22 therebetween, and the operating tool 36 is supported on the upper portion of the transmission sleeve 24. It is externally fitted to a plurality of balls (engaging tools) 37 that have been formed. More specifically, a plurality of communication holes 38 are formed in the upper end portion (first end portion) of the transmission sleeve 24 at intervals in the circumferential direction so as to penetrate therethrough.
Are inserted so as to be able to advance and retreat in the horizontal direction. A tapered first surface 41 and a second surface 42 connected to the first surface 41 are formed vertically on the inner peripheral surface of the operation tool 36. The clamping mechanism M of the clamp rod 3 is provided with the transmission sleeve 2 described above.
4, the operating tool 36, the engaging tool 37, and the driving means D.

The cylindrical hole 24b of the transmission sleeve 24 and the upper hole 18 constitute a receiving path P for the clamp rod 3. The cover member 4 is inserted into the cylindrical hole 24b.
4 is inserted movably up and down, and its lid member 44 is urged upward by an advance spring (advance means) 45. Reference numeral 46 denotes a guide rod.

Further, a supply port 47 for a cleaning fluid is provided above the lower housing portion 12. As shown mainly in FIG. 1, the supply port 47 is connected to the second port.
Annular gap 22 and the lower groove 4 of the upper housing portion 13
8 through the first communication path 51,
9 and from there to the upper end of the receiving path P. These spouts 49 are connected to the lid member 44 described above.
Is formed so as to extend toward the axis A at substantially the same height as the upper end of.

The supply port 47 is provided with the second communication passage 5.
2 and communicates with the upper end of the receiving path P. The second communication path 52 includes the second annular gap 22, the contact gap on the lower surface of the operating tool 36, the first annular gap 21, and the internal space of the transmission sleeve 24. And a fitting gap 50 between the outer peripheral surface of the cover member 44 and the cylindrical hole 24b of the transmission sleeve 24.

The operation of the clamp device 10 is described with reference to FIG.
4 and FIG. As shown in FIG.
When starting to insert the clamp rod 3 fixed to the work piece 1 into the housing 11, the clamp device 10 is operated to the clamp release state. That is, by discharging the pressure oil from the supply / discharge port 28, the piston 20 is moved upward by the first return spring 31. Further, the transmission sleeve 24 is connected to the second return spring 32.
Is moved upward, and the plurality of balls 37 are switched to the disengagement position Y separated from the axis A.
Further, the cover member 44 is moved upward by the advance spring 45. Thereby, the upper end of the cylindrical hole 24b of the transmission sleeve 24 is covered with the lid member 44.

Further, as shown in FIG. 1 above, compressed air for cleaning is supplied to the supply port 47,
A large amount of the compressed air is discharged from the ejection port 49 through the above-described first communication passage 51 (see a broken arrow). For this reason,
Foreign matter, such as dust and swarf, adhering to the upper surface of the lid member 44 and the lower portion of the clamp rod 3 is blown away by the discharged compressed air to be cleaned. The compressed air is discharged upward from the fitting gap 50 through the above-described second communication passage 52 although the amount of the compressed air is very small, so that the fitting gap 50 is also cleaned.

From the state shown in FIG.
, The screw driver 4 at the lower end of the clamp rod 3 pushes the lid member 44 downward, whereby the clamp rod 3 is inserted into the cylindrical hole 24 b of the transmission sleeve 24. It is inserted. At the start of insertion of the clamp rod 3, the guide hole 1
When the center A of the shaft 7 and the center B of the clamp rod 3 are misaligned, the transmission sleeve 24 and the operating tool 36 move in the horizontal direction due to the existence of the two annular gaps 21 and 22. The above misalignment is automatically corrected.

As a result, as shown in FIG. 4, the clamp rod 3 is smoothly inserted into the cylindrical hole 24b of the transmission sleeve 24, and the reference surface R of the work piece 1 is supported by the support portion of the upper housing portion 13. It is received by the surface S. During the insertion of the clamp rod 3, the gap between the upper hole 18 of the upper housing portion 13 and the outer peripheral surface of the clamp rod 3 is narrowed. The outer peripheral surface of the rod 3 is sufficiently cleaned. During the insertion of the clamp rod 3, the transmission sleeve 24 is held at the ascending position shown by the second return spring 32 against the insertion resistance.
For this reason, the compressed air for cleaning is discharged vigorously in the centripetal direction from the outlet 49, and the engaged portion 5 is strongly cleaned by the compressed air. As a result, it is possible to prevent an erroneous engagement at the time of engagement between the engaged portion 5 and the ball 37 described later.

Further, immediately before the reference surface R of the work piece 1 is received by the support surface S, the gap between the two surfaces R and S is narrowed, and the compressed air flows vigorously through the gap. The compressed air can strongly clean both surfaces R and S as described above (see the dashed line arrow in FIG. 4). For this reason, the workpiece 1 can be accurately positioned with respect to the housing 11.

Subsequently, pressure oil is supplied to the working chamber 27 and the transmission sleeve 24 is driven downward by the piston 20 against the two return springs 31 and 32. Then, as shown in FIG.
4, the ball 37 inserted into the communication hole 38 is pressed by the first surface 41 of the operation tool 36 toward the axis A (see FIG. 1), and is switched to the engagement position X. The second surface 42 locks the engagement position X.

Thus, the driving force of the piston 20 is transmitted to the workpiece 1 through the transmission sleeve 24, the ball 37, and the clamp rod 3 in this order.
The workpiece 1 is fixed to the pallet 7. In the clamp state, since the leakage of the compressed air for cleaning is prevented and the pressure of the supply port 47 increases, the increase in the pressure is detected by a pressure switch (not shown), so that the clamp state is detected. You can check.

In order to release the clamped state shown in FIG. 5, the pressure oil may be discharged from the working chamber 27. Then
As shown in FIG. 4, the piston 20 and the transmission sleeve 24 are moved upward by return springs 31 and 32,
The locked state by the second surface 42 of the operation tool 36 is released, and the ball 37 becomes free (here, the ball 37 has already moved in the centrifugal direction and switched to the disengagement position Y). Is shown). Thereafter, the work piece 1 is moved upward. Then, the engaged portion 5 and the flange portion 6 of the clamp rod 3 retreat the plurality of balls 37 to the disengagement position Y, so that the clamp rod 3 is smoothly removed. At the same time, the lid member 4
4 is returned to the position shown in FIG.

FIGS. 7 to 14 show other embodiments and modified examples of the present invention. In these other embodiments and modifications, members having the same configuration as in the first embodiment are given the same reference numerals in principle.

FIG. 7 shows a second embodiment, in which FIG.
FIG. The device of FIG. 7 differs from the device of FIG. 1 in that the transmission sleeve 24 and the piston 20 are moved upward by the first return spring 31 via a spring receiver 55. is there.

FIG. 8 shows the third embodiment, and FIG.
FIG. The device of the third embodiment is different from the device of FIG. 7 in that the plurality of ejection ports 49 are formed obliquely upward in the upper part of the transmission sleeve 24. The upper surface of the operating tool 36 is provided with a plurality of upper grooves 36a that are a part of the first communication path 51 described above.

FIG. 9 shows a first modification of the third embodiment, and is a partial view corresponding to FIG. The operation tool 36 is extended upward, and the upper portion of the transmission sleeve 24 is in contact with the upper portion of the extended portion 36b,
The lid member 44 is fitted into the upper part of the cylindrical hole of the extension part 36b. The plurality of outlets 49 are formed on the upper surface of the extending portion 36b.

FIG. 10 shows a second modification of the third embodiment, and is a partial view corresponding to FIG. The device of FIG. 10 differs from the device of FIG. 9 described above in that a sealing ring 57 is interposed between the upper part of the housing 11 and the upper part of the transmission sleeve 24, and the sealing ring 57 is provided.
Is held at the raised position by the pressing spring 58, and the cylindrical hole of the sealing ring 57 is covered by the lid member 44. In addition, the contact hole between the upper surface of the sealing ring 57 and the housing 11 constitutes the ejection port 49. In the unclamped state shown in the drawing, if a slight air pressure is applied to the supply port 47, the inside of the housing 11 is maintained at a positive pressure, so that foreign substances such as dust enter the housing 11. It can be reliably prevented.

FIG. 11 shows a fourth embodiment and is a view corresponding to FIG. The device shown in FIG.
The difference from the above device is that the cover member 44 is fitted into the upper portion of the upper hole 18 of the housing 11, and the upper member 18 which is the upper end of the above-mentioned receiving path P is inserted by the cover member 44.
It is configured to cover. Further, the biasing force of the first return spring 31 acts on the piston 20 via the spring receiver 60 and the transmission sleeve 24. Further, the lower end of the advance spring 45 for urging the lid member 44 upward is received by the spring receiver 60.

FIG. 12 shows a first modification of the fourth embodiment, and is a partial view corresponding to FIG. The device of FIG. 12 is different from the device of FIG. 11 in that a spacer 62 is mounted between the operating tool 36 and the upper part of the housing 11, and the cover member 44 is inserted into a cylindrical hole of the spacer 62. And the contact hole between the upper surface of the spacer 62 and the upper portion of the housing 11 constitutes the jet port 49.

FIG. 13 shows a second modification of the fourth embodiment, and corresponds to FIG. 12 described above. This figure 1
12 is different from the device of FIG. 12 in that the spacer 62 is urged upward by a pressing spring 63 so that the upper part of the spacer 62 is
And the lid member 44 is fitted into the cylindrical hole of the spacer 62.

FIG. 14 shows a third modification of the fourth embodiment, and is a view corresponding to FIG. This figure 1
13 is different from the device of FIG. 13 in that the upper part of the transmission sleeve 24 is formed in the upper hole 18 of the housing 11.
And the lid member 44 is fitted into the upper portion of the sleeve 24. In addition, the above-mentioned spout 49
Is formed by a contact gap between the transmission sleeve 24 and the upper hole 18, and extends obliquely upward in the centripetal direction.

As shown by a two-dot chain line in the figure, a machining allowance C for polishing or cutting is provided at the upper end of the housing 11. When installing a plurality of clamp devices, first, a plurality of housings 1
1 is mounted on the work pallet (not shown here), and then a plurality of machining allowances C are deleted in a flush state. Thereby, the support surfaces S of the plurality of housings 11 can be aligned at the same level. In addition, during the processing of the processing allowance C, by performing the above-described air blowing, it is possible to prevent foreign substances such as abrasive grains, cutting powder, and cutting oil from entering the housing 11. The provision of the machining allowance C at the upper end of the housing 11 is the same in the above-described embodiments and modifications.

Each of the above embodiments and modifications can be further modified as follows. The pressure fluid for driving the piston 20 may be another type of liquid instead of pressure oil, or may be a gas such as air. The driving means D having the piston 20 may be configured as a spring driven / fluid pressure return type, instead of being configured as a fluid pressure driven / spring reset type. It is also possible to configure.

The means for causing the lid member 44 to advance upward may be an elastic body such as rubber instead of the spring 45, and may use a pressurized fluid such as compressed air. . The engagement tool engaged with the engaged portion 5 of the clamp rod 3 may be another type of engagement tool such as a swing cam in place of the ball 37, and may be constituted by a plurality. It is also possible to constitute with one thing instead of. The above-described clamping mechanism M may be any mechanism that pulls and fixes the clamp rod 3, and is not limited to the illustrated mechanism.

The cleaning fluid may be another kind of gas such as nitrogen gas instead of compressed air, or may be a liquid. The clamp rod 3 provided on the workpiece 1 may be detachable by another means such as a retaining ring instead of the screw fitting type. An object to be clamped by the clamp device 10 is:
Instead of the workpiece 1, another type of object such as a mold may be used. In this case, the clamp rod 3 may be always attached to the fixed object, or may be formed integrally with the fixed object.

An object to be fixed such as the work piece 1 may be received by the upper surface of the work pallet 7 instead of being received by the upper surface of the housing 11. In this case, the housing 11 is
It is conceivable to fix it to the lower surface of the. The object to be fixed may be fixed by one clamp device instead of being fixed by a plurality of clamp devices. The direction of connection and disconnection between the object to be fixed and the clamp device may be a horizontal direction or an oblique direction instead of the illustrated vertical direction.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, in a state where insertion of a clamp rod into a housing of a clamp device is started, and is a view corresponding to a cross-sectional view taken along line II of FIG. .

FIG. 2 is an elevation view of a workpiece fixed by the clamp device.

FIG. 3 is an elevation view showing a state where the workpiece is clamped by the clamping device.

FIG. 4 is a diagram showing a clamp release state of the clamp device.

FIG. 5 is a longitudinal sectional view showing a clamp state of the above clamp device and corresponding to a portion indicated by an arrow V in FIG. 3;

FIG. 6 is a plan view of the housing.

FIG. 7 shows a second embodiment of the present invention and is a view corresponding to FIG. 1 described above.

FIG. 8 shows a third embodiment of the present invention and is a view corresponding to FIG. 7 described above.

FIG. 9 shows a first modification of the third embodiment, and is a partial view corresponding to FIG. 8 described above.

FIG. 10 is a view showing a second modification of the third embodiment and corresponding to FIG. 9 described above.

FIG. 11 shows a fourth embodiment of the present invention and is a view corresponding to FIG. 1 described above.

FIG. 12 shows a first modification of the fourth embodiment, and is a partial view corresponding to FIG. 11 described above.

FIG. 13 is a view showing a second modification of the fourth embodiment, and corresponding to FIG. 12 described above.

FIG. 14 is a view showing a third modification of the fourth embodiment and corresponding to FIG. 12 in the above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Clamp rod, 5 ... Engagement part, 11 ... Housing, 17 ... Guide hole, 20 ... Drive member (piston), 20
a ... cylindrical hole, 21 ... first annular gap, 22 ... second annular gap, 24 ... transmission sleeve, 24b ... cylinder hole, 36 ... operating tool, 37 ... engaging tool (ball), 44 ... lid member, 45: Advance means (advance spring), 47: Supply port for cleaning fluid, 4
9: injection port, 51: communication path, D: drive means, H: hollow space, M: clamping mechanism, P: receiving path, X: engagement position, Y: engagement release position.

Claims (5)

[Claims] 1. A device for pulling and clamping a clamp rod (3) inserted into a housing (11), comprising a receiving path opened at a first end of the housing (11).
(P) and a cover member which is movably inserted in the axial direction into the receiving path (P) and covers the first end portion of the receiving path (P).
(44) and an extension means (45) for pressing the lid member (44) against the first end portion of the receiving path (P), and resisting the pressing force of the extension means (45). Then, the clamp rod (3) is configured to be insertable into the clamping position in the receiving path (P), and the clamp rod (3) is moved to the second position of the housing (11) by the clamping mechanism (M). A clamping device configured to be pulled to an end. 2. The clamping device according to claim 1, wherein a transmission sleeve (24) is movably inserted in the axial direction into a hollow space (H) opened at the first end of the housing (11). And the cylindrical hole (24b) of the transmission sleeve (24)
Constitutes at least a part of the receiving path (P), and inserts the lid member (44) movably in the axial direction into the cylindrical hole (24b). By pressing the first end by the advancing means (45),
The cover member (44) covers the first end portion of the cylindrical hole (24b), and the driving sleeve (24) is driven by the driving means (D) with respect to the operating tool (36) provided on the housing (11). ), The transmission sleeve (2)
The engaging tool (37) supported at the first end of the above (4) is engaged with the engaged part (5) of the clamp rod (3) at the same position as the engaged part (5). 5) Disengagement position to disengage with
(C) a clamp device configured to be switchable to (Y). 3. The clamping device according to claim 2, wherein a guide hole (17) is formed in a peripheral wall of the hollow space (H) of the housing (11), and a second hole of the guide hole (17) is formed. An annular driving member (20) is inserted into the end portion so as to be movable in the axial direction, and a first annular gap (21) is formed in a cylindrical hole (20a) of the driving member (20) to form the transmission sleeve (20). 24. A clamping device, wherein the operating tool (36) is inserted by inserting a second annular gap (22) at a first end portion of the guide hole (17). 4. The clamping device according to claim 1, wherein a supply port (47) for the cleaning fluid is provided in the housing (11), and the supply port (47) is connected to the communication passage (51). Through the spout (49) and the spout
A clamping device, wherein (49) is oriented toward a first end of the lid member (44). 5. The clamping device according to claim 4, wherein the communication path is formed by the second annular gap (22) formed between the guide hole (17) and the operating tool (36).
(51) A clamping device comprising a part of (51).