JPH04203510A - Hydraulic clamp for flanged member - Google Patents

Abstract

PURPOSE:To facilitate work and attain miniaturization and simplification in structure and prevent uneven tension by providing a clamp operating oil chamber, a piston and a clamp tool in order form the foremost end wall of a hydraulic cylinder to the base wall thereof, and switchably disposing a clamp tool output portion in a clampable position where a clamp tool is extruded by an inclined cam and in an unclampable retarding position where pushed by a spring. CONSTITUTION:There are provided a clamp operating oil chamber 14 on the right of a piston 12 inside a cylinder main body 9 while a spring chamber 15 with a piston return spring 18 disposed therein on the left. a clamp tool 8 is constituted of a clamp pawl 8a capable of moving expansively or contractibly in the radial direction of the piston 12. With leftward movement of the piston 12, the clamp tool 8 is extruded toward a clampable advancing position against a retarding spring 23 by an advancing inclined cam 24. With further movement, a piston output portion 12a is operated to push the clamp tool 8 toward a base end wall 9b. Therefore, a clamping operation is facilitated with a simple constitution so as to miniaturize a clamp and prevent uneven tension.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic clamp for a flanged member in which the flanged portion of a fixed member is pressed and fixed to a fixed member by the hydraulic pressure of a hydraulic cylinder. This is a technology that downsizes and simplifies the entire device.

(Prior Art) Conventionally, as a means for removably fixing a flange member to a stationary side member, there is a method shown in FIGS. 11 to 15.

Conventional example 1 (see Fig. 11) In this example, the flange 2b of the cylinder head 2, which is the member to be fixed, is fixed to the screw cylinder l, which is the fixed member of the injection molding machine, with a plurality of attachment/detachment bolts 71. It is something.

Conventional Example 2 (Refer to FIGS. 12 to 14) This is something that the inventor of the present invention first considered, in which the adapter plate 73 is fixed to the screw cylinder 1 with fixing bolts 74,
A plurality of clamp claw retractable hydraulic clamps 75 are arranged in the circumferential direction of the adapter plate 73. In addition,
As for the structure of the clamp claw retractable hydraulic clamp 75, for example, the structure shown in FIG.
191227).

When operating the clamps, first, each hydraulic clamp 7
5 is retracted into the front face of the clamp body 77 by the tension of the return spring 82, and in this state the cylinder head 2 is inserted into the center of the adapter plate 73. Next, by driving the piston 79 forward with the hydraulic pressure of the hydraulic cylinder 78, the piston rod 80 moves the clamp claw 81 out of the front of the clamp body 77, and the clamp claw 81 attaches the flange 2b to the adapter plate 73. It's about pressing down.

Conventional example 3 (see Fig. 15) This is a case where the body 8 which is the fixed side member of the autoclave 84
A mirror plate 86, which is a member to be fixed, is removably fixed to 5. Flange portions 87 and 88 of the body member 85 and end plate 86 are fixed to each other with a large number of attachment/detachment bolts 89.

(Problem to be solved by the invention) Conventional Example 1 (see FIG. 11) has the following problem.

(b) Clamp operation is time-consuming.

Every time the cylinder head 2, which is the member to be fixed, is replaced, it is necessary to manually fit the attachment/detachment bolt 71 into the threaded hole of the screw cylinder 1 and tighten it, which takes time and effort for the clamping operation.

Conventional Example 2 is excellent in that it can solve the above problem (a), but has the following problems (b) to (e).

(b) The entire clamping device is complicated.

The clamp device requires two or more hydraulic clamps 75, and also has to provide a clamp/unclamp operation detection means and a hydraulic conduit for each hydraulic clamp 75, so the overall configuration is complicated.

(c) The entire clamp device is large.

Since each hydraulic clamp 75 protrudes radially from the clamping position of the object to be fixed, the clamping device has a large outer diameter and is large in size as a whole.

(d) Clamp density is small.

In order to avoid interference between adjacent hydraulic clamps 75, 75, the pitch of the clamp claws 810 in the circumferential direction has to be large, and the area where the flange 2b cannot be ramped is wide, resulting in a low clamping density.

Therefore, the surface pressure applied to the flange 2b increases, and the flange 2b
damage or distort b.

(E) A one-sided line occurs.

The plurality of hydraulic clamps 75 must have different sliding frictional resistances and hydraulic oil flow resistances when hydraulically driven, and there is a risk that the flange portion 2b may be lopsided due to a slight deviation in operation timing.

In Conventional Example 3 (see FIG. 15), a large number of attachment/detachment bolts 89 are manually attached and detached in order to ensure the sealing performance of the autoclave 84, so the clamping operation is very time-consuming.
The above-mentioned problem (a) becomes noticeable.

Furthermore, in order to eliminate the need for one-sided bolts, the bolts 89 for attaching and detaching, which are arranged in large numbers in the circumferential direction, must be tightened alternately on diagonals, which makes the clamping operation even more time-consuming.

Moreover, even if one attempts to use the hydraulic clamp 75 for clamping such a large-diameter flange 88, there are problems (
B) to (E) become significant, making it unsuitable for practical use.

The present invention solves all of the above-mentioned problems (a) to (e) to facilitate clamping operation, downsize and simplify the entire clamping device, increase clamping density, and The purpose is to make the line defense 1.

(Means for Solving the Problems) In order to achieve the above object, the present invention has been made, for example, as shown in FIGS. 1 to 6, FIGS. 7 and 8, FIG. 9, or FIG. 1, between the tip wall 9a and the base wall 9b of the cylinder body 9 of the hydraulic clamp 7, there is a clamp hydraulic oil chamber 14 and a piston 1.
2 and a clamping tool 8 are provided in this order, and the clamping tool 8 has at least the clamping tool output section 26 on the proximal wall 9b side located at a clampable advanced position The clamp tool 8 is configured to be able to be switched to the unclampable retracted position Y approaching radially to the unclampable retracted position Y, and the retracting spring 23 presses the clamping tool 8 toward the unclappable retracted position Y, while the advancing inclined cam 24 allows the clamping to advance. Configuration 1-, allowable stroke L of the piston 12 in the cylinder body 9
is set to a size greater than or equal to the sum of the lift M for clamp operation and the lift N for pushing out the clamp tool, and the piston 12 extends the section of the lift N for pushing out the clamp tool from the tip wall 9a side of the cylinder body 9 to the proximal wall. In the clamp tool extrusion operating state where the clamp tool 8 is driven toward the 9b side, the clamp tool 8 moves toward the advancing inclined cam 24.
The piston 12 is pushed out against the retraction spring 23 from the unclampable retracted position Y to the clampable advanced position In the clamp operating state in which the clamp is driven toward the base wall 9b, the piston output portion 12a provided on the piston 12 presses the clamp tool 8 toward the base wall 9b.

(effect) The operation of the present invention will be explained based on FIG.

When clamping/unclamping the hydraulic clamp 3,
The clamping tool 8 is switched as shown in FIGS. 1(a), 1(b), and 1(c).

(a) shows the unclamping method, in which the piston 12 retreats toward the tip wall 9a of the cylinder body 9 and the clamp 14.
8 is switched to the unclampable retracted position Y by the retracting spring 23.

(b) The figure shows a switching transient state L, and the piston 12 is moved by a lift N for pushing out the clamp tool on the base end wall 9 of the cylinder body 9.
The clamping tool 8 is driven to the b side, and the clamping tool 8 is switched to the clampable advancing position X by the advancing inclined cam 24.

(C) shows a clamped state, in which the piston 12 is further driven toward the base end wall 9b, the clamping tool 8 is operated to clamp, and the flange of the fixed member B is placed between the clamping tool 8 and the fixed member A. The portion 2b is pressed and fixed.

The fixed member B is sometimes attached by inserting the fixed member B into the cylinder body 9 in the state shown in FIG. When the hydraulic cylinder 7 is hydraulically driven, the clamping tool 8 changes from the state shown in (a) to the state shown in (b).
While switching to the state shown in the figure, in conjunction with the movement of the piston 12, from the unclampable retracted position Y to the clampable advanced position x
Then, the state shown in (b) changes to (C).
) While switching to the state shown in the figure, it is moved to the proximal wall 9b side,
Performs clamp operation.

Also, when removing the fixed member B, the hydraulic cylinder 7
By returning the clamp tool 8, the clamp tool 8 changes from the state shown in (C) to the state shown in (b) (contrary to the above).
a) Switch to the state shown in the figure.

At this time, the clamp tool 8 is retracted to the retracted position Y where clamping is not possible by the retracting spring 23. As a result, the flange 2
The fixed member B can be taken out from the fixed member A without getting caught by the clamp tool 8.

In this way, the clamping tool 8 is switched and operated in conjunction with the piston 12 of the hydraulic cylinder 7, so there is no need to manually operate the clamping tool 8, and the clamping operation of the hydraulic clamp 3 becomes easy.

In addition, only one hydraulic clamp 3 is required, one hydraulic pipe line is required, and one motion detection device is required to detect clamping/unclamping motions. Therefore, the overall configuration of the clamp device is simplified.

Furthermore, since the hydraulic clamp 3 does not protrude greatly in the radial direction from the fixed position of the fixed member B, the outer diameter only needs to be small, and it can be made compact.

In addition, since the clamping tools 8 are arranged side by side in the circumferential direction of the flange 2b of the fixed member B, the area that cannot be suppressed is small (
However, the clamp density is large.

Therefore, in ensuring a predetermined clamping force, the surface pressure applied from the clamp tool 8 to the flange 2b is reduced, and the flange 2b is
b can be prevented from being damaged or distorted.

Furthermore, since the clamping operation is performed using one hydraulic clamp 3, the entire circumference of the flange 2b can be tightened almost simultaneously and equally with the clamp tool 8, thereby eliminating uneven tightening of the flange 2b.

(Effects of the Invention) The present invention has the following effects because it is configured and operates as described above.

(b) Clamp operation becomes easier.

Since the clamping tools are sequentially switched and operated in conjunction with the piston of the hydraulic cylinder, there is no need to manually operate the clamping tools, and the clamping operation of the hydraulic clamp becomes easy.

(0) The clamp device can be simplified.

Only one hydraulic clamp is required, and additional equipment such as a hydraulic pipe line is also required for one unit, simplifying the overall configuration of the clamping device.

(c) The clamp device can be made smaller.

Since the hydraulic clamp does not protrude significantly in the radial direction, it only needs to have a small outer diameter, and can be made compact.

(d) The clamp density is large.

Since the clamping tools are arranged side by side in the circumferential direction of the flange of the fixed member, the area that cannot be pressed can be reduced, and the clamping density is high. Therefore, in order to secure a predetermined clamping force, the surface pressure applied from the clamping tool to the flange is small.
It can prevent the collar from being damaged or distorted.

(E) Uneven tightening of the collar can be prevented.

Clamp operation is done with one hydraulic clamp, so
The entire circumference of the flange can be tightened simultaneously and evenly with the clamp tool, and uneven tightening of the flange can be prevented. Therefore, for example, even if a hydraulic clamp is applied to attach and detach the lid of a sealed container, the sealing performance is not impaired.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show one embodiment thereof.

FIG. 2 shows a hydraulic clamp used for attaching and detaching the cylinder head of an injection molding machine. In the figure, a cylinder rod 2, which is a fixed side member B with a flang, is removably fixed to the right side of a screw cylinder l, which is a fixed side member A of an injection molding machine, with a hydraulic clamp 3.
The molten resin is injected into the cylinder from the nozzle 2a of the gamma door 2 by means of a screw la inserted therein. The hydraulic clamp 3 is formed by fixing the seven-ring main body 9 of the hydraulic cylinder 7 to the right end surface of the screw/cylinder 1 with a plurality of fixing bolts 5. By suppressing and driving the clamping tool 8 with the hydraulic pressure of the hydraulic cylinder 7, the flange portion 2b of the cylinder head 2 is pressed and fixed to the screw/cylinder 1.

The hydraulic cylinder 7 has a tip wall 9a (
From the right end wall in the figure, the same applies hereafter) to the base wall 9b (the left end wall in the figure,
The same applies hereinafter), a clamp hydraulic oil chamber 14, a piston 12, and a clamp tool 8 are provided in this order. As shown in the operation explanatory diagram of FIG.
Clampable advance position X that is radially distant from the body 9c of
and a non-clampable retracted position Y which approaches the body portion 9c in the radial direction. And clamp tool 8
is configured such that the retracting spring 23 presses it toward the unclampable retracted position Y, while the advancing inclined cam 24 pushes it toward the clampable extended position X. Further, the allowable stroke I7 of the piston 12 within the cylinder body 9 is set to a dimension greater than or equal to the lift M for clamp operation plus the lift N for pushing out the clamp tool. And piston 12
The clamp tool is pushed out from the tip wall 9a side of the cylinder body 9 (
, in the clamp tool extrusion operating state in which the section of the lift N is driven toward the base end wall 9b side, the clamp tool 8 moves forward from the unclampable retracted position Y to the clampable retracted position Y by the advancing inclined cam 24 against the retracting spring 23. Pushed to position X. Furthermore, in the clamp operation state in which the piston 12 is driven toward the base wall 9b in the section of the clamp operation lift M that is closer to the base wall 9b than the lift N for the clamp shell extrusion 17, the piston 1
The piston output portion 12a provided at 2 presses the clamp jL8 toward the base end wall 9b.

The above configuration will be explained in more detail below.

First, the hydraulic cylinder 7 will be explained with reference to FIG. 2. It is configured as a single acting spring return type. That is, the cylinder body 9
A cylindrical piston 12 is slidably and oil-tightly inserted into the right side of the cylinder. The piston 12 has a guide rf protruding from its right side.
It is guided in the left and right direction by J13. A clamp hydraulic oil chamber 14 is formed on the right side of the piston 12, and the piston 12
A left side nihon chamber 15 is formed. Clamp hydraulic oil chamber 1
4 is communicated with a hydraulic power source (not shown) via an oil supply/drainage hole 17.

On the other hand, inside the spring chamber 15, a piston return spring 18 made of a compression coil spring is installed. The left end of the piston return spring 18 is received by the cylinder body 9 via a spring receiving plate 19, and the right end of the spring is received by the piston 12.

Next, regarding the clamp tool 8 and the retraction spring 23,
This will be explained with reference to FIGS. 2 and 3 to 6.

3 and 4 show a state in which the clamping tool 8 is switched to the retracted position 11Y where clamping is not possible 17, and FIGS. 5 and 6 show a state in which the clamping tool 8 is switched to the extended position lx where clamping is possible. 12.

The clamp tool 8 includes a plurality of clamp claws 8a arranged in an annular shape when viewed from the side, and each clamp claw 8a can expand and contract in the radial direction of the piston 12. That is, the expansion/contraction movement guide circumferential groove 28 is formed over the outer periphery of the plurality of clamp claws 8a arranged in an annular manner. Also, bis! - An expansion/contraction movement guide ring 29 is installed between the left surface of the piston 12 and the piston return spring 18, and each clamp claw 8a is attached to this expansion/contraction movement guide ring 29.
A circumferential expansion/contraction movement guide groove 28 is slidably fitted therein. Further, spring insertion holes 38, 38 extending in the tangential direction are formed facing each other in the mutually adjacent clamp claws 8a, 8a, and a positioning pin 39 is inserted into the spring insertion holes 38, 38. A spring seat 40 is formed by expanding the diameter of the axially central portion of the positioning pin 39. An opening spring 41 made of a compression coil spring is installed between the spring seat 40 and the bottom wall of each spring insertion hole 38. The plurality of opening springs 41 constitute the retracting spring 23 (17).

The advancing inclined cam 24 will be explained mainly based on FIG. 2.

The advancing inclined cam 24 is formed in a cylindrical shape, is inserted into the left side space of the clamp tool 8 so as to be able to move laterally, is pressed rightward by a pressing spring 25, and is prevented from moving rightward by a predetermined amount or more. It is blocked by a spring receiving plate 19 of the piston return spring 18. The spring force of the pressure spring 25 is set to a smaller value than the spring force of the piston return spring 18, and the elastic force of the pressure spring 25 causes a cam to flare out at the right side of the advancing inclined cam 24. The surface 43 comes into contact with a cam engagement surface 44 formed at a 1° angle on the left outer peripheral surface of each clamp claw 8a.

By supplying pressure oil from the oil supply/discharge hole 17 to the clamp hydraulic oil chamber 14 in the cylinder body 9, the piston 12 moves against the elastic force of the piston return spring 18 to the left base end. 9b side, and accordingly, the piston output portion 12a presses the clamp tool 8 toward the base end wall 9b side of the cylinder body 9. As a result, the hydraulic clamp 3 is switched from the unclamped state shown in FIG. 1(a) to the clamped state shown in FIG. 1(C) via the switching transient state shown in FIG. 1(b).

The allowable horizontal stroke L of the piston 12 within the cylinder body 9 is set to be greater than the sum of the lift M for clamp operation and the lift N for pushing out the clamp tool. Then, in the clamp tool extrusion operating state during switching from FIG. 3A to FIG. Along with this, the clamp tool 8 is pushed out radially inward along the expansion/contraction movement guide ring 29 against the retraction spring 23 by the advancing inclined cam 24, and can be clamped from the unclampable retracted position Y. The advance position is switched to X. Furthermore, in the clamp operating state during the switching from the same figure (b) to the figure (C), the piston 12 is moved from the clamp operating lift M below the clamp tool extrusion lift N.
Descend through the section.

Along with this, the piston output section 12a presses the clamp tool 8, and the clamp tool output section 26 pushes the cylinder head 2.
The flange portion 2b of the screw cylinder 1 is pressed and fixed to the screw cylinder 1.

On the other hand, from the clamped state in figure (C) above to (a)
Switching to the unclamped state shown in the figure is performed by discharging pressure oil from the clamp hydraulic oil chamber 14 and returning the piston 12 to the tip wall 9a side by the elastic force of the piston return spring 18. In this case, as the piston 12 moves to the right, the expansion/contraction movement guiding ring 29 moves together with the elastic force of the piston return spring 18.
Each clamp claw 8a is separated from the advancing inclined cam 24 through the clamping mechanism 24, and the clamp tool 8 is switched from the clampable advanced position X to the unclampable retracted position Y.

7 and 8 show another example of the use of the hydraulic clamp 3, in which members having the same functions as those of the above embodiment are given the same reference numerals.

This is the body 5 which is the fixed side member of the autoclave 50.
1, an end plate 52 which is a member to be fixed with a flange is detachably attached using a hydraulic clamp 3. A cylinder body 9 of a hydraulic cylinder 7 is fixed to a body 51 of an autoclave 50 with a plurality of fixing bolts 5. By hydraulically driving the piston 12 with the hydraulic pressure of the hydraulic cylinder 7, the clamping tool output section 26 of the clamping tool 8 presses and fixes the flange section 53 of the end plate 52 to the cylinder body 9.

FIG. 9 and FIG. 1O each show a modification of the hydraulic clamp.

FIG. 9 is a view corresponding to FIG. 2, and is constructed by protruding an advancing inclined cam 24 from the left side of the piston 12, and a clamping tool 8 is mounted in the space on the left side of the advancing inclined cam 24.

A piston return spring 18 is installed between the expansion/contraction movement guide ring 29 of the clamp tool 8 and the base end wall 9b of the cylinder body 9. Further, a pressure spring 25 for separating the cam is installed between the ring 29 and the piston 12.

The one shown in FIG. 10 is a further modification of the one shown in FIG. 9 described above as follows. That is, a solid cylinder main body 9 is fixed to a fixed base 61, which is a fixed side member, and the clamp tool 8, piston 12, and advancing inclined cam 24 are attached to the outer circumferential side of the cylinder main body 9. Then, the member to be fixed 62 is inserted into the outer peripheral side of the cylinder body 9, and the inner flange portion 62b is suppressed and fixed by the clamp tool output portion 26.

Although the piston 12 is configured to have a cylindrical shape in the above-mentioned embodiments and modifications, it may also have a rectangular cylindrical shape. Further, although the clamping tool 8 is configured with a plurality of clamping claws 8a arranged in an annular manner, it is sufficient that the position of the clamping tool 8 can be changed in the radial direction of the piston 12 by the advancing inclined cam 24. 8 may be formed in one piece. Furthermore, although the retraction spring 23 is configured with a plurality of opening springs 41, it may be any spring that presses the clamp tool 8 outward in the radial direction and retracts the clamp tool 8.
The retraction spring 23 may be constructed using the elastic restoring force of the material itself.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention. FIG. 1 is an explanatory diagram of the operation, FIG. 1(a) is a diagram showing an unclamped state, FIG. 1(b) is a diagram showing a switching transient state,
Fig. 1 (C) is a diagram showing the clamped state, Fig. 2 is a longitudinal sectional view showing the usage state of the hydraulic clamp, Fig. 3 is a partial view taken along the line ■-■ of Fig. 1 <a>, and Fig. 4 The figure is a sectional view taken along the line IV-IV in Figure 3, and Figure 5 is a cross-sectional view of Figure 1 (b
) is a partial view taken along the line v-V, and FIG. 6 is a sectional view taken along the line ■-■ in FIG. 7 and 8 show other usage examples of the hydraulic clamp, FIG. 7 is a partial external view of the autoclave, and FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. FIG. 9 is a view corresponding to FIG. 2 showing a modification of the hydraulic clamp. FIG. 10 is a view corresponding to FIG. 2 showing another modification of the hydraulic clamp. 11 to 15 show conventional examples. FIG. 11 is a diagram corresponding to FIG. 2 showing conventional example 1. Figures 12 to 14 show Conventional Example 2, Figure 12 is an external view equivalent to Figure 11, Figure 13 is a right side view of Figure 12, and Figure 14 is a longitudinal sectional view of the hydraulic clamp. be. FIG. 15 is a diagram corresponding to FIG. 7 showing conventional example 3. 7...Hydraulic cylinder, 8.Clamp tool, 9/
Link body, 9a distal wall, 9b/proximal wall,
9c... body, 12... piston, 12a
Piston output part, 14... Clamp hydraulic oil chamber, 23...
Retraction spring, 24... Inclined cam for advancement, 26 Clamp tool output section, L... Allowable stroke of piston 12, M...
・Lift for clamp operation, N... Lift for pushing out the clamp tool i, X... Advance position where clamping is possible, Y... Retracted position where clamping is not possible. Patent applicant: Cosmec Co., Ltd. Figure 8

Claims (1)

[Claims] 1. A clamp hydraulic oil chamber 14, a piston 12, and a clamping tool 8 are provided in this order between the tip wall 9a and the base end wall 9b of the cylinder body 9 of the hydraulic cylinder 7, and the clamping tool 8 has at least The clamp tool output section 26 on the base wall 9b side is switched between a clampable advanced position X, which is radially away from the body 9c of the cylinder body 9, and a clampable retracted position Y, which is radially closer to the body 9c. The retracting spring 23 presses the clamping tool 8 toward the unclampable retracted position Y, while the advancing inclined cam 24 pushes the clamping tool 8 toward the clampable retracted position X. The allowable stroke L of the piston 12 is set to a dimension greater than or equal to the sum of the lift M for clamp operation and the lift N for pushing out the clamp tool, so that the piston 12 moves from the tip wall 9a side of the cylinder body 9 to the lift N for pushing out the clamp tool. In the clamp tool extrusion operating state where the section is driven toward the base end wall 9b side, the clamp tool 8 is pushed out by the advancing inclined cam 24 against the retracting spring 23 from the unclampable retracted position Y to the clampable extended position X. In the clamp operation state in which the piston 12 is driven toward the base wall 9b in the section of the clamp operation lift M that is closer to the base wall 9b than the clamp tool extrusion lift N,
A hydraulic clamp for a flanged member characterized in that a piston output portion 12a provided on a piston 12 presses a clamping tool 8 toward a base end wall 9b.