JPS59194107A - Cylinder device for clamp - Google Patents

Abstract

PURPOSE:To relax restrictions on the clamp speed by disposing a partition wall in a cylinder case and providing a piston rod with a vane to independently conduct the turning and rectilinear motion of a clamp arm and conduct clamp operation without a cam groove and a cam follower. CONSTITUTION:A partition wall 20 is projected into the interior of a cylinder case 9 to be brought into slidable contact with a rod portion 11 of a piston rod 8. A vane 21 is disposed on a boundary portion formed between the rod portion 11 of the piston rod 8 and a piston portion 12 and brought into slidable contact with the inner surface of the cylinder case 9. A fluid path 22 has the first and second openings 23, 24 connected to the interior of the cylinder case 9. These openings are arranged in such a manner as to clamp the piston portion 12 of the piston rod 8 when the piston rod 8 reaches the stroke end.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp cylinder device installed in an automated machine tool, and more particularly to a clamp cylinder device equipped with a clamp arm that performs two movements: turning and linear movement.

FIG. 1 is an explanatory diagram showing a clamping (gripping) operation performed in this type of clamping cylinder device. In this figure, 1 is a clamp cylinder, 2 is a clamp arm, and 3 is a clamped material. The clamping operation is performed as follows. First, place the material to be clamped 3 on, for example, a surface plate, and move the clamp arm 2 at the arrow 4.
Turn it as shown by arrow 5, and then lower it as shown by arrow 5. As a result, the material to be clamped 3 is clamped. Note that until the material to be clamped 3 is installed, the clamp arm 2 is usually placed in a place where it does not interfere with the installation work of the material to be clamped 3.

To release the clamp, the clamp arm 2 is raised as shown by arrow 6, and then rotated as shown by arrow 7. As a result, the clamp arm 2 is moved to a place where it does not interfere with the removal work of the clamped material 3, and the clamped material 3 can be removed from the surface plate or the like.

FIG. 2 is a side sectional view showing a conventional clamp cylinder device. In this figure, 2 is the aforementioned clamp arm, 8 is a piston rod, and 9 is a cylinder case in which this piston rod 8 is housed. The piston rod 8 is
It consists of a rod part 11 that is integrally provided with the clamp arm 2 and has a cam groove 10, and a piston part 12 that is provided at the lower end of this rod part 11. In addition, the rod portion 11
The cam groove 10 consists of a straight part 13 and a curved part 14. Further, 15 is a pin fixed to the inner surface of the cylinder case 9, 16 is a cam follower rotatably attached to this pin 15 and inserted into the aforementioned cam groove 10, 17.18
1 is a supply/discharge boat provided in the cylinder case 9, and 19 is a seal.

In this conventional clamp cylinder device, when pressure oil is supplied to the supply/discharge boat 17 from the state shown in FIG. to guide you.

At this point, in the embodiment shown in FIG. 2, since the cam follower 16 is located on the curved portion 14, the rod portion 11 descends with rotational movement. Therefore, in the range corresponding to the curved portion 14, the clamp arm 2 partially pivots and linearly moves as indicated by the arrow 4.5 in FIG. When the cam follower 16 reaches the straight part 13 of the cam groove 10, the rod part 11 descends linearly and the clamp arm 2
performs a linear movement as shown by arrow 5 in FIG. A clamping operation is performed. In addition, in order to release the clamp, it is sufficient to supply pressure oil to the supply/discharge boat 18, whereby the rod portion 111, that is, the clamp arm 2, rises and rotates in the reverse procedure to the above, and the clamping by the clamp arm 2 is performed. is released.

By the way, the conventional clamp cylinder device configured as described above has the following problems.

(1) Since the clamp arm 2 always undergoes a linear movement when it pivots, and the cam groove 10 provided in the rod portion 11 and the cam follower 16 are designed to engage with each other, the clamp arm 2 is particularly When the clamp arm 2 rotates while descending, if the clamp arm 2 hits a part of the material to be clamped other than the intended clamping position and unnecessary rotational force is applied to the core clamp arm 2, the force will be transferred to the cam follower. As a result, the cam follower 16 is damaged.

(2) Since the clamp arm 2 is always accompanied by a linear motion when pivoting, the entire stroke of the rod portion 11 cannot be made into an effective stroke that can be clamped, and therefore, the desired effective stroke cannot be obtained. In order to do this, the length of the cylinder case 9 must be set thick.

(3) Rod part 110 stroke S1 piston part 12
Let h be the thickness dimension of cam follower 16 and seal 1.
As the length dimension up to 9, s+h is required as the length dimension between the S5 cam follower 16 and the bottom of the cylinder case,
In the end, the length of the inner wall of the cylinder case 9 is 2s+
h is required. Therefore, from a different point of view (2) above, the length dimension of the cylinder case 9 has to be set large.

(4) The cam groove 10 provided in the rod portion 11 and the cam follower 16 are engaged with each other, and the cam follower 16
Since the cylinder is fixed to the cylinder case 9 via the pin 15, the flow rate of the pressure oil supplied to the cylinder case 9, that is, the clamping speed is restricted, and no improvement in the efficiency of the clamping operation can be expected.

If the clamping speed were increased, a large lateral load would be transmitted to the pin 15 and the pin 15 would be damaged.

The present invention has been made in view of the actual situation in the prior art, and its purpose is to enable the rotation and linear movement of the clamp arm to be performed independently, and to perform clamping operation without providing a cam groove or a cam follower. It is an object of the present invention to provide a clamping cylinder device that can perform the above operations and alleviate restrictions on clamping speed.

To achieve this object, the present invention includes a clamp arm, a piston rod integrally provided with the clamp arm and consisting of a rod part and a piston part, and a cylinder case that movably houses the piston rod.
In a device that performs a clamping operation by rotating and linearly moving the piston rod and rotating and linearly moving the clamp arm, the piston rod is provided in the cylinder case and protrudes into the inside of the cylinder case. , comprising at least one vane provided on the piston rod, and a fluid passage provided in the cylinder case and having a first opening and a second opening communicating with the interior of the cylinder case, the first opening and the second opening communicating with the interior of the cylinder case. The opening is arranged so as to sandwich the piston portion of the piston rod.

Hereinafter, the clamp cylinder device of the present invention will be explained based on the drawings. Figures 3 to 5 are explanatory diagrams showing one embodiment of the present invention, where Figure 3 is a side sectional view, Figure 4 is a partial sectional view taken along line A-A in Figure 3, and Figure 5 is an illustration during operation. It is side cross-sectional meat which illustrates an aspect. In addition, in these figures and FIG. 6, which will be described later,
Components that are the same as those described above are designated by the same reference numerals.

In FIGS. 3 to 5, 2 is a clamp arm, 8 is a piston rod, and 9 is a cylinder case, which are as described above. 20 is provided in the cylinder case 9,
It is a partition wall that protrudes into the inside of the cylinder case 9 and has a predetermined length dimension, which will be described later. It has become. A vane 21 having a predetermined length, which will be described later, is provided at the boundary formed between the rod portion 11 and the piston portion 12 of the piston rod 8 so as to be in sliding contact with the inner surface of the cylinder case 9. There is. A fluid passage 22 is formed in the cylinder case 9 and has a first opening 23 and a second opening 24 communicating with the inside of the cylinder case 9. The first opening 23 and the second opening 24 are arranged in such a positional relationship that they sandwich the piston portion 12 of the piston rod 8 when the piston rod 8 reaches the stroke end on the rod portion 11 side, for example. It is. When the piston rod 8 reaches the stroke end on the rod part 11 side, the first opening 23 communicates with the internal space of the cylinder case 9 located above the piston part 12, and the second opening 24 communicates with the internal space of the cylinder case 9 located below the piston portion 12. Further, reference numerals 25 and 26 shown in FIG. 4 are stoppers that restrict the rotation of the vane 210, that is, the rotation of the piston rod 8, and 27 and 28 are stoppers that restrict the rotation of the vane 210, that is, the rotation of the piston rod 8; and the inner wall of the cylinder case 9. In addition,
The first opening 23 described above can communicate with the chamber 28, and one supply/discharge boat 17 formed in the cylinder case 9 can communicate with the chamber 27, and the other supply/discharge boat 1 can communicate with the chamber 27.
8 communicates with an internal space located below the piston portion 12 of the cylinder case 9.

In addition, the length dimensions of the partition wall 20 and vane 21 described above,
That is, the dimension in the direction along the axis of the rod portion 11 is set as follows.

For example, between the piston part 12 and the cylinder case 9,
Let the frictional force in the axial direction of the cylinder case 9 be T, which is the frictional torque in the rotational direction of F1, and the diameter of the piston portion 12 be Dl,
The diameter of the rod part 11 is D2, the length of the partition wall 20 and the vane 21 is L, the pressure inside the chamber 2γ is P, and the angle α (deg) formed by the chamber 27 with respect to the axis of the rod part 11 is
, ), then the force F' along the axis of the cylinder case 9 due to the pressure P is given by 4 360 ·, and the rotational torque T' due to the pressure P is u)t -])2
) (Dt ”Dz )T'=
xLxPx - 4 contains 4. Therefore, the length dimension of the vane 21
When the piston section 12 rotates, it is set so that F ) F' and 'I'') T. When the piston section 12 moves up and down, DI r D2 rα, P is set so that it becomes at least F') F. Ru.

If the lengths of the partition wall 20 and the vane 21 are set in this manner, when the piston rod 8 is lowered, the piston rod 8 is first rotated, and after a stiff rotation movement, the piston rod 8 is rotated. It can be lowered.

In one embodiment configured in this manner, the clamping operation can be performed as follows.

That is, in the state shown in FIG.
When pressure oil flows into the chamber 27r formed in the cylinder case 9, the vane 21 rotates due to the pressure oil, and the piston rod 8 rotates together with the vane 21.
Clamp arm 2 pivots. Then, when the vane 21 hits the stopper 26, the piston rod 8 stops rotating.

As a result, the pressure P in the chamber 27 increases, and the force of this pressure P causes the piston portion 12 to descend as shown in FIG.
The piston rod 8 and the clamp arm 2 are lowered together with the piston portion 12, whereby the clamp arm 2 performs a clamping operation.

Furthermore, when the clamp is released, pressure oil may be allowed to flow from the supply/discharge boat 18 into the space of the cylinder case 9 located below the piston portion 12 .

As a result, the piston part 12 rises, and this piston part 1
2, the piston rod 8 and the clamp arm 2 rise together. Then, when the piston rod 8 finishes rising, that is, when it reaches the stroke end on the rod part 11 side, the pressure oil on the supply/discharge boat 18 side flows into the second opening 2.
4. The fluid is supplied to the chamber 28 through the fluid passage 22 and the first opening 23, and the vane 21 rotates until it hits the stopper 25, and the piston rod 8 rotates together with the vane 21. 2 turns.

In one embodiment configured in this way, the partition wall 20
By appropriately setting the length of the vane 21, the rotation of the page 721 and the raising and lowering of the piston portion 12 can be performed independently, that is, the rotation and linear movement of the clamp arm 2 can be performed independently. . Further, since the piston portion 12 is raised and lowered by hydraulic pressure and the vane 21 is rotated by hydraulic pressure, it is possible to perform a clamping operation without intervening the cam groove and the cam follower. Furthermore, 1 piston part 12 and hiheen 2
Since the clamping operation can be carried out by applying hydraulic pressure to the piston 12 and the vane 21, no unreasonable load is applied to the piston section 12 and the vane 21. Therefore, restrictions on the clamping distance are relaxed, and high-speed operation is possible. It can be realized.

In the above-mentioned embodiment, when the rotation torque T' exceeds the friction torque T, the piston portion 12 begins to rotate, and this rotation increases the angle of the chamber 27. By using this relationship, the stopper 25 in the above embodiment can be used.
In other words, the diameter D1 of the piston part 12 and the diameter of the rod part 11 can be adjusted so that the relationship F'>F is satisfied only when the pen 21 comes to a position corresponding to the stopper 25. If D2 and the position of the partition wall 20 are set,
The piston portion 12 automatically shifts from rotational motion to linear motion without requiring a stop operation using the stopper 25, thereby making it possible to perform a desired clamping operation.

FIG. 6 is an explanatory diagram showing another embodiment of the present invention, and this figure is drawn corresponding to FIG. 4. In this No. 611C, 30.31 is a partition wall provided in the cylinder case 9 and protruding into the inside of the cylinder case 9, and each of the convex portions 3
2.33 or convex portions 34° and 35, and is arranged at a position corresponding to the rod portion 11 side end of the piston rod 8,
It is adapted to come into sliding contact with the rod portion 11 of the piston rod 8.

Further, 3Fi and 37 are vanes, which are provided at the boundary formed between the rod portion 11 and the piston portion 12 of the piston rod 8, and are in sliding contact with the inner surface of the cylinder case 9. 38 is a chamber formed by the vane 36, the partition wall 31, 5 piston part 12, and the inner wall of the cylinder case 29; 39 is formed by the vane 36, the partition wall 30, the piston part 12, and the inner wall of the cylinder case 9; A chamber 40 contains the vane 37, the partition wall 30, and the piston part 1.
2 and the inner wall of the cylinder case 9 , and 41 is a chamber formed by the vane 37 , the partition wall 31 , the piston portion 12 , and the inner wall of the cylinder case 9 . Further, reference numerals 42 and 43 designate supply and discharge boats disposed in the upper part of the cylinder case 9, and the above-mentioned chambers 41 and 3, respectively.
9 can be communicated with. Although not shown, supply and discharge ports are also arranged in the lower part of the cylinder case 9. Reference numeral 44 denotes a fluid passage formed in the cylinder case 9, which has a first opening 45 communicating with the above-mentioned chamber 40 and a second opening (not shown). Similarly, 46 is a fluid passage formed in the cylinder case 9, and has a first opening 47 communicating with the above-mentioned chamber 38 and a second opening (not shown). Note that the first opening 45 and the second opening of the fluid passage 44 and the first opening 47 and the second opening of the fluid passage 46
For example, the opening of the piston rod 8 is the rod part 11 (
The piston rod 8 is arranged in such a position that the piston portion 12 of the piston rod 8 is sandwiched therebetween when the stroke end of the piston rod 8 is reached.

Further, the length dimensions of the vanes 36, 37 and the partition walls 30, 31 are set as in the previous embodiment.

In one embodiment configured as shown in FIG.
The clamping operation can be performed as follows.

That is, in the state shown in FIG.
When pressurized oil flows into each of the chambers 41.39 from 2.43, the vane 37.36 first rotates due to the pressure oil, and the piston rod 8 rotates together with this vane 37.36. The arm rotates. And vane 3
The rotation of the piston rod 8 is stopped when the piston rods 7 and 36 come into contact with the convex portions 33.34 of the partition wall 30.31. As a result, the pressure in the chamber 41.39 increases, this pressure causes the piston part 12 to descend, and the piston rod 8 and the clamp arm 2 to descend together with the piston part 12, thereby causing the clamp arm 2 to perform a clamping action. It is carried out.

Further, when the clamp is released, pressure oil may be allowed to flow into the cylinder case 9 from an unillustrated supply/discharge port provided below the cylinder case 9. As a result, the piston portion 12 is placed in the upper row, and the piston rod 8 and the clamp arm are raised together with the piston portion 12. and,
When the piston rod 8 finishes rising, that is, when the piston rod 8 reaches the end of the stroke of the rod portion 11, the pressure oil on the supply/discharge boat (not shown) flows through the fluid passages 44, 46 and the first opening. 45.47 is supplied to the light chamber 40.3B, and the vanes 37 and 36 are connected to the partition wall 31.
．． 30, the piston rod 8 rotates together with these vanes 37 and 36, and the clamp arm 2 pivots.

In the embodiment configured as shown in FIG. 6, the same effects as those obtained in the embodiment shown in FIGS. .37, the rotational torque T' is doubled compared to the case of the above-mentioned embodiment, whereas the force F' for raising and lowering the piston portion 12 is
is substantially the same as the embodiment described above, and therefore, the piston rod 8 can be rotated more reliably before the piston rod 8 moves up and down.

As described above, the clamp cylinder device of the present invention has the structure in which the cylinder case is provided with the partition wall and the piston rod is provided with the vane, and therefore, the effects listed below are achieved.

(1) Without providing a cam groove and a cam follower as in the past (clamping operation can be performed,
When the clamp arm is lowered, if unnecessary rotational force is applied to the clamp arm due to a collision with a part of the clamped material other than the intended clamping position, the vane rotates to release the rotational force. be able to. Therefore, damage caused by this rotational force will not occur.If the rotational force is removed, the vane will rotate due to hydraulic pressure, and the clamp arm will automatically return to its original state (rotated position). You can return to

(2) Since the rotation of the clamp arm and the M-line movement can be performed independently, the entire stroke of the rod section provided integrally with the clamp arm can be made into an effective stroke capable of clamping. The length of the cylinder case can be made the minimum length corresponding to the stroke of the rod portion, and the length of the cylinder case can be made smaller than in the past.

(3) Assuming that the stroke of the rod section provided integrally with the clamp arm is S, and the thickness of the piston section is L, which is the length of the h5 vane, the length of the inner wall of the cylinder case is given by s + h + L. Since L can generally be designed to be shorter than S, the length of the inner wall of this cylinder case can be made shorter than in the past.

(4) Since restrictions on the clamping speed can be relaxed, the efficiency of clamping work can be improved compared to the conventional method.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a clamping operation performed in a clamping cylinder device, Fig. 2 is a side cross-sectional view showing a conventional clamping cylinder device, and Figs. 3 to 5 show an embodiment of the present invention. In the description, FIG. 3 is a side sectional view, FIG. 4 is a partial sectional view taken along the line A-A in FIG. 3, FIG. 5 is a side sectional view illustrating the mode of operation, and FIG. It is an explanatory diagram showing an example of. 2... Clamp arm, 8... Piston rod, 9... Cylinder case, 12...
...Piston part, 1γ. 18.42.43...Payment e-Bo), 19...
... Seal, 20.30.31 ... Bulkhead, 2
1.36.37...Bane, 22.44.46
...Fluid passage, 23, 45. 47...First opening, 24...Second opening, 25°26...Stopper, 27, 28
, 38 , 39 , 40.41...room, 32
．． 33, 34.35...Protrusion. Figure 1 Figure 2 □ Figure 3 Figure 4

Claims (1)

[Claims] 1. A clamp arm, a piston rod integrally provided with the clamp arm and consisting of a rod part and a piston part, and a cylinder case that movably houses the piston rod, and allows the piston rod to be rotated and linearly moved. In the clamping cylinder device, the clamping cylinder device performs a clamping operation by rotating and linearly moving the clamp arm; at least one vane provided in the cylinder case; and a fluid passage provided in the cylinder case and having a first opening and a second opening communicating with the interior of the cylinder case, the first opening and the second opening A cylinder device for a clamp, characterized in that it is formed so as to be able to be arranged so as to sandwich the piston portion of the piston rod.