JP2565425Y2 - Clamping device - Google Patents

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 a die or a work to be machined to a board surface of a board member.

[0002]

2. Description of the Related Art As a clamping device for clamping a mold of an injection molding machine or a press machine to a mold fixing plate, for example, Japanese Utility Model Publication No. 48-44073 and Japanese Patent Publication No. 52-30
Various clamp devices are put into practical use as described in Japanese Patent Publication No. 371. In particular, in a horizontal injection molding machine, a vertical mold fixing plate is provided, clamping devices are provided on both left and right portions of the mold fixing plate, and when the mold is replaced, the mold is replaced by using an overhead crane. It is common to exchange. At the time of mold replacement, the crane was connected to the mold, the clamp was released from the clamp device, and the clamp device was retracted to the side. Then, another mold is suspended by a crane, lowered along the board surface, and the mold is fixed to the board surface by the clamp device in a state where the clamp device is moved toward the mold. Further, even when the size of the mold changes due to the replacement of the mold, it is necessary to change the mounting position of the clamp device.

[0003] Since a T-groove is not formed on the board surface of a horizontal injection molding machine, and only a plurality of tap holes are formed in a predetermined arrangement pattern, the above-described tap hole is used as a clamping device. It is desirable to apply a clamp device that can be fixed to the board surface via the interface and that can be switched in position while mounted on the board surface. As a clamp device that can meet this demand, the clamp device described in Japanese Utility Model Publication No. 58-54990 is in practical use. In this clamp device, a slit is formed in the clamp arm,
A bolt hole of the holding plate engaged with the upper end of the clamp arm and a fulcrum bolt inserted through the slit of the clamp arm are screwed into the bolt holes on the board surface, and the rear end of the clamp arm is inserted into the board surface via spacers and bolt members. , And the mold is fixed to the board surface at the front end of the clamp arm by fastening a fulcrum bolt.

[0004]

When replacing a mold in the injection molding machine or the press machine, the mold is removed, the mold is removed, and then another mold is carried in. The device is set at the clamping position and clamped. In the clamp device disclosed in Japanese Patent Publication No. 52-30371, since the clamp body is fixed to the board surface with bolts, it takes time and effort to switch the position of the clamp device when replacing the mold. 48-
In the clamp device disclosed in Japanese Patent No. 44073, the clamp device cannot be mounted on a board surface where no T-groove is formed, such as a board surface of an injection molding machine.

On the other hand, the clamp device described in Japanese Utility Model Publication No. 58-54990 can be mounted by effectively utilizing existing tap holes on the board surface, and the position of the clamp arm can be switched by loosening the fulcrum bolt. is there. However, since the clamp arm and the fulcrum bolt are not connected at all in the clamp released state, they tend to be separated, and handling and storage thereof are troublesome. Since this clamp device is lightweight, it is suitable for fixing a mold to a vertical board surface of a horizontal injection molding machine.However, since a strong clamping force cannot be generated, a large number of clamp devices are required. In addition, it is difficult to enhance the workability of releasing the clamp, and there is a risk that parts may fall when the clamp is released. The object of the present invention is to make effective use of existing tap holes on the board surface so that it can be mounted on the board surface, to simplify the switching of the position of the clamp device, and to enhance the workability of clamping and releasing the clamp device. , Increasing the clamping force, and the like.

[0006]

According to a first aspect of the present invention, there is provided a clamp device for fixing an object to be clamped to a board surface of a board-like member, wherein the clamp body is disposed on the board surface and a bottom surface of which is in contact with the board surface. And an output unit formed at the front end of the clamp body and facing the board surface with an interval for receiving a portion to be fixed of the clamp target, and the clamp body,
A plurality of guide holes which are elongated in the front-rear direction and are formed orthogonal to the board surface, and are respectively inserted into the plurality of guide holes arranged in parallel, so that the clamp body is movable in the front-rear direction and does not float from the board surface. A plurality of flanged bushes having a flange portion to be locked as described above, a plurality of bolts respectively inserted through the plurality of flanged bushes and screwed into bolt holes on the board surface to fix the flanged bush to the board surface; A plurality of hydraulic cylinders each mounted in the output section orthogonal to the board surface and capable of driving the piston rod to advance toward the board surface, and a plurality of hydraulic cylinders arranged in a row in a direction orthogonal to the front-rear direction; It is provided with.

Here, the guide hole may be formed in a T-shaped cross-section hole having a stepped portion and opened to the top of the clamp body. The clamp body may be formed as a T-shaped cross-section hole that is not opened at the top of the clamp body and has a step, and the guide hole is opened at the front end or the rear end of the clamp body. The output section may be provided with a hydraulic supply port and an oil passage communicating with the hydraulic chambers of the plurality of hydraulic cylinders at the hydraulic supply port. According to a fifth aspect of the present invention, there is provided the clamp device according to the first aspect, wherein a hydraulic cylinder is provided in the clamp body in a front-rear direction. A fixture is provided to extend and fix the distal end portion of the piston rod to the board surface. 7. The hydraulic booster according to claim 6, further comprising a plunger inserted into a plunger chamber connected to the oil passage, and a hydraulic cylinder that drives the plunger, inside the clamp body. Is provided.

According to a seventh aspect of the present invention, there is provided a clamp device for fixing an object to be clamped to a board surface of a board-shaped member, wherein the clamp body is disposed on the board surface and a bottom surface of which is in contact with the board surface. An output portion formed at the front end portion and facing the board surface at an interval where the fixed portion of the object to be clamped is inserted, and the clamp body is formed in the front and rear direction to be elongated in the front-rear direction and orthogonal to the board surface, and parallel in parallel. A plurality of parallel guide holes, and a plurality of bolt members each having a bolt head that is inserted through the plurality of guide holes and screwed into a bolt hole on the board surface, and movably locks the clamp body. A plurality of hydraulic cylinders mounted in the output portion orthogonal to the board surface and capable of driving the piston rod to clamp toward the board surface, the plurality of hydraulic cylinders being arranged in a row in a direction orthogonal to the front-rear direction. It is obtained by a hydraulic cylinder.

[0009]

In the clamp device according to the present invention, a plurality of flanged bushes inserted through a plurality of guide holes of the clamp body are fixed by bolts, and the clamp body is provided with a plurality of movably in the front-rear direction. It is locked by a flanged bush so as not to float from the board surface. A plurality of hydraulic cylinders orthogonal to the board surface are mounted in a row at an output portion at the front end of the clamp body. When the output unit is positioned above the portion to be clamped of the object to be clamped on the board surface and the hydraulic pressure is supplied to a plurality of hydraulic cylinders, the piston rods of the plurality of hydraulic cylinders advance toward the board surface and move the object to be clamped to the board surface. Will be fixed. When releasing the clamp,
Although it is sufficient to release the hydraulic pressure of the plurality of hydraulic cylinders, in this clamp release state, the clamp body can move in the front-rear direction through the plurality of guide holes and the plurality of flanged bushes,
By moving the clamp body backward, the position can be switched to the retracted position where the clamp body has retreated.

According to this clamp device, the clamp body is attached to the board surface through the plurality of flanged bushes respectively inserted through the plurality of guide holes of the clamp body and the plurality of bolts respectively inserted through the flanged bushes. Can be installed strongly. Therefore, the object to be clamped can be strongly clamped by the plurality of hydraulic cylinders provided in the output section. In the clamp release state, the clamp body can move in the front-back direction, so that the position of the clamp device can be freely switched in the front-rear direction. Since the clamping is performed by the plurality of hydraulic cylinders, the workability of clamping and unclamping can be improved, and even in the unclamped state, the clamp device does not detach from the panel surface.

In the clamp device according to the second aspect, the head of the bolt can be operated from outside the clamp body, so that the mounting and dismounting of the clamp device becomes easy. In the clamp device according to the third aspect, since the guide hole is not open to the top of the clamp body, no foreign matter enters the guide hole. Therefore, the clamping device is suitable for clamping a workpiece to be machined. In the clamp device according to the fourth aspect, since a hydraulic pressure can be supplied to a plurality of hydraulic cylinders from one hydraulic supply port, a hydraulic supply system is simplified.

In the clamp device according to the fifth aspect, the position of the clamp body can be switched in the front-rear direction by the hydraulic cylinder provided in the clamp body in the front-rear direction.
In the clamp device according to the sixth aspect, the hydraulic booster can increase the hydraulic pressure of the plurality of hydraulic cylinders to increase the clamping force. According to the clamp device of the seventh aspect, substantially the same operation and effect as those of the clamp device of the first aspect can be obtained. However, a plurality of flanged bushes are saved, and the clamp body is directly locked by bolts. The configuration simplifies the configuration of the clamp device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a clamp device for fixing a mold to a mold fixing plate of a horizontal injection molding machine. As shown in FIGS. 1 and 2, a mold 3 is mounted on a plate surface 2 of a pair of vertical mold fixing plates 1 of a horizontal injection molding machine.
Are respectively arranged, and each mold 3 is fixed to the board surface 2 by a pair of clamp devices 10. The structure of the clamp device 10 will be described with reference to FIGS.

The clamp body 11 is formed of a rectangular thick plate-shaped metal member that is vertically elongated.
The entire area of the bottom surface is arranged on the board surface 2 so as to be in surface contact with the board surface 2. At the front end of the clamp body 11, an output portion 12 facing the board surface 2 is formed at a predetermined interval to accommodate the fixed portion 3a of the mold 3. In the upper and lower portions of the clamp body 11, four guide holes 13 elongated in the front-rear direction are provided in the middle of the clamp body 11 in the front-rear direction.
Are formed in parallel. The guide hole 13 is formed in a T-shape with an open top end.
4 and a wide hole 15, and a step 16 is formed at the bottom of the wide hole 15.

A flanged bush 17 comprising a cylindrical portion 18 and a flange portion 19 at the top thereof is inserted into each guide hole 13, and the cylindrical portion 18 is inserted into the narrow hole portion 14 and the flange portion 19 is inserted into the wide hole portion 15. And the cylindrical portion 18 is provided with the narrow hole portion 14.
Is formed slightly longer than the height of. A bolt 20 is inserted into each flanged bush 17 from outside, and the bolt 2
0 is screwed into the bolt hole 4 of the board surface 2, and each flanged bush 17 is inserted into the flanged bush 17 with a slight gap between the flange portion 19 and the stepped portion 16, and It is fixed to the board surface 2 by bolts 20 screwed into the second bolt holes 4. Therefore, the clamp body 11 is movable in the front-rear direction within the range permitted by the guide holes 13, but the four flanges 1 of the four flanged bushes 17 are movable.
9 locks so as not to float from the board surface 2. The head 20a of each bolt 20 is accommodated in the wide hole 15.

The output unit 12 is provided with eight hydraulic cylinders 30 arranged in a line in a vertical direction in a direction perpendicular to the board surface 2. For each hydraulic cylinder 30, a cylinder chamber is formed by closing the bottom of a cylinder hole formed in the clamp body 11 with an annular member 31, and a piston 32 is accommodated in the cylinder chamber, and a piston extending from the piston 32 to the board surface 2 side. The rod 33 is inserted through the rod hole of the annular member 31, and the piston rod 33 is configured to be able to advance from the output unit 12 toward the board surface 2. Of the cylinder chambers, an oil chamber is provided on the top side of the piston 32. 34 is formed, and an air chamber 35 is formed on the board surface 2 side of the piston 32.

In order to supply oil pressure to the oil chambers 34 of the eight hydraulic cylinders 30, an oil passage 36 communicating with a top of the eight oil chambers 34 from a hydraulic pressure supply port 37 at the upper end of the clamp body 11 is formed straight. And a hydraulic hose 38 extending from a hydraulic supply device (not shown).
Is connected. The air chambers 3 of the eight hydraulic cylinders 30
In order to supply pressurized air to the air supply port 5, an air passage 41 communicating from the air supply port 39 at the upper end of the clamp body 11 to the eight air chambers 35 is formed straight. An air hose 40 extending from a device (not shown) is connected. However, it may be configured to supply the hydraulic pressure to constitute the air chamber 35 to the oil chamber, also,
By mounting the return spring in the air chamber 35, the piston 32 may be configured to return actuated by a spring.

The operation of the clamp device 10 described above will be described. The clamp device 10 can be mounted on the board surface 2 by utilizing the four bolt holes 4 of the board surface 2. In the unclamped state, as shown in FIG. 4, the retracted position shown by the solid line and the clamp position shown by the chain line The clamp body 11 does not separate from the board surface 2. When the clamp device 10 is switched to the clamp position and the hydraulic pressure is supplied to the eight hydraulic cylinders 30, the eight piston rods 33 advance and the fixed portion 3a of the mold 3 is fixed.
To the board 2 strongly. Clamp reaction force in the clamping state, four flanged bush 17
It is strongly supported by four bolts 20 through the flange portion 19.

When exchanging the mold 3, the mold 3 is exchanged in a state where the clamp is released and the state is switched to the retracted position. Then, after the mold 3 is replaced, the clamp 3 is switched to the clamp position again, and then the clamp state is set. Clamp body 1
1 can freely adjust the position in the front-rear direction within the range permitted by the guide hole 13, so that the molds 3 of various sizes can be fixed. In addition, by changing the mounting position where the clamp device 10 is mounted on the board surface 2, the molds 3 of various sizes can be fixed. 8
Since the configuration is such that clamping is performed by the two hydraulic cylinders 30, clamp driving and clamp release can be easily performed. The guide hole 13, the flanged bush 17, and the bolt 20 are not limited to four sets, and may be provided in two or more sets.
The number of the hydraulic cylinders 30 may be eight or less or eight or more. Further, the flanged bush 17 may be omitted, and the step 16 may be directly locked by the head 20a of the bolt 20.

Next, a description will be given of a plurality of modified examples in which a part of the clamp device is modified. However, the same reference numerals are given to the same components as those in the above-described embodiment, and the description is omitted.
As shown in FIG. 6, a hydraulic cylinder 45 that is oriented in the front-rear direction is provided inside the central portion of the clamp body 11A of the clamp device 10A, and the piston rod 46 protrudes rearward from the rear end of the clamp body 11A. , L-shaped fixture 49 is fixed to the board surface 2 with bolts 50, and the piston rod 46 is connected to the fixture 49 by a pair of nuts 51. Hydraulic hoses 47 and 48 extending from a hydraulic pressure supply device (not shown) are connected to the hydraulic cylinder 45. In the clamp release state, the hydraulic cylinder 45
Thereby, the position can be switched by moving the clamp device 10A in the front-rear direction. With this configuration,
The driving of the clamp, the release of the clamp, and the switching of the position of the clamp device 10A can be remotely controlled via the hydraulic supply device. Note that an air cylinder may be provided instead of the hydraulic cylinder 45.

As shown in FIG. 7, a hydraulic booster 60 extending in the front-rear direction is provided inside the central portion of the clamp body 11B of the clamp device 10B. This hydraulic booster 60
A large-diameter cylinder hole 61, a piston 62 mounted in the large-diameter cylinder hole 61, an oil chamber 63, a spring 64 mounted in the spring chamber (however, this can be omitted), and a small-diameter plunger. A hole 65 and a plunger 6 extending from the piston 62 and inserted into the small-diameter plunger hole 65
6 and a plunger chamber 67 connected to the oil passage 36. The oil pressure is supplied to the oil chamber 63 via a hydraulic hose 68 extending from a hydraulic pressure supply device (not shown).

In a state where the clamp device 10B is switched to the clamp position, before the oil pressure is supplied to the oil chamber 63,
When oil pressure is supplied to the eight hydraulic cylinders 30, the oil passage 36
, The hydraulic pressure is supplied to the plunger chamber 67. Next, when hydraulic pressure is supplied to the oil chamber 63 to drive the piston 62 forward, the plunger 66 causes the plunger chamber 67 and the oil passage 3 to move forward.
Since the oil pressure in the oil chambers 34 of the six and eight hydraulic cylinders 30 is increased, the clamping force can be enhanced. However,
In order to prevent the oil pressure from flowing backward to the hydraulic hose 38, a hydraulic supply device for supplying the oil pressure to the hydraulic hose 38 is provided with an on-off valve and the like. When the hydraulic booster 60 is provided, the hydraulic pressure of the hydraulic cylinder 30 can be increased to significantly increase the clamping force, or the hydraulic cylinder 30 can be downsized. Note that, instead of the hydraulic booster 60, a screw-type hydraulic booster configured to pressurize the hydraulic pressure with a screw member may be provided. Alternatively, when the capacity of the plunger chamber 67 of the hydraulic booster 60 is increased, the hydraulic hose 38 and the hydraulic supply port are omitted, and the eight hydraulic cylinders 30 from the hydraulic booster 60 are omitted.
May be configured to supply hydraulic pressure to the motor.

As shown in FIG. 8, when the thickness of the clamp body 11C is made large, eight sets of hydraulic cylinders having a two-stage in-line structure are provided on the output part 12C. An auxiliary hydraulic cylinder 30C is provided in series on the top side of each hydraulic cylinder 30 having substantially the same structure as the hydraulic cylinder 30, and an oil chamber 34 is formed in the piston 70 and the piston rod 71 of the auxiliary hydraulic cylinder 30C. Oil chamber 7 via path 72
3 and is configured to perform a clamp drive by the hydraulic pressure of both hydraulic cylinders 30, 30C. With this configuration, the clamping force can be enhanced.

As shown in FIG. 9, the width of the clamp body 11D of the clamp device 10D in the front-rear direction is enlarged, and the length of the guide hole 13D is enlarged. In this case, the position adjustment stroke of the clamp device 10D increases.

As shown in FIG. 10, the clamping device 10E
Two relatively small guide holes 13 in the clamp body 11E
E is formed, and the flanged bush 1 is
The clamp body 11E is mounted on the board surface 2 via the switch 7, and the output unit 12E is provided with four hydraulic cylinders 30.

As shown in FIGS. 11 and 12, a plurality of guide holes 13F of the clamp body 11F of the clamp device 10F are provided.
Is formed in a hole having a T-shaped cross section that is not opened at the top of the clamp body 11F, and is opened at the rear end (or front end) of the clamp body 11F. In the case of this clamp device 10F, after a plurality of flanged bushes 17 are fixed to the board surface 2 with bolts 20 in advance, the clamp body 11F
Is moved from the front (or from the rear), and each guide hole 1 is moved.
A flanged bush 13F fixed to the 3F with a bolt 20 can be introduced. Since the outside of the guide hole 13F is not open, foreign matter does not enter the guide hole 13F. Therefore, the clamping device is suitable for fixing a workpiece machined by a machine tool. The flanged bush 17 may be omitted, and the step 16 may be locked directly by the head of the bolt 20.
The rear end may be closed by a detachable metal fitting.

As shown in FIGS. 13 and 14, the guide hole 13 is provided in the clamp body 11G of the clamp device 10G.
Instead, a plurality of guide holes 13G having a rectangular cross section are formed, the flanged bush 17 is omitted, and a stepped bolt 20G inserted into each guide hole 13G is screwed into the bolt hole 4 of the board surface 2, A slight gap is formed between the head of each bolt 20G and the top end surface of the clamp body 11G, and the head 20b of the plurality of stepped bolts 20G allows the clamp body 11G to be movable in the front-rear direction and from the board surface 2. It is configured to lock so as not to float. In the clamp device 10G, since the structure of the guide hole 13G is simplified and the flanged bush 17 can be omitted, the overall configuration is simplified.

The clamp device described above fixes not only the mold of the injection molding machine but also the mold of the press machine to the board surface of the bolster, and the work to be machined by the machine tool on the table of the machine tool. The present invention is also applicable to fixing to a board surface or a work pallet board surface, and is applicable to fixing various works and tools to the board surface of a board-shaped member.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state where a mold is fixed to a mold fixing plate of a horizontal injection molding machine by a clamp device according to an embodiment.

FIG. 2 is a perspective view of a mold and a clamp device of FIG. 1;

FIG. 3 is a side view of the clamp device of FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a side view of a clamp device according to a modification.

FIG. 7 is a side view of a clamp device according to a modification.

FIG. 8 is a partial view corresponding to FIG. 4 of a clamp device according to a modification.

FIG. 9 is a side view of a clamp device according to a modification.

FIG. 10 is a side view of a clamp device according to a modification.

FIG. 11 is a diagram corresponding to FIG. 4 of a clamp device according to a modification.

FIG. 12 is a sectional view taken along line 12-12 of FIG. 11;

FIG. 13 is a diagram corresponding to FIG. 4 of a clamp device according to a modification.

FIG. 14 is a sectional view taken along line 14-14 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die fixed board 2 Board surface 3 Die (clamp target) 10, 10A-10G Clamping device 11, 11A-11G Clamp main body 12, 12C Output part 13, 13F, 13G Guide hole 16 Step part 17 Flanged bush 20, 20G bolt 30, 30C Hydraulic cylinder 33 Piston rod 36 Oil passage 37 Hydraulic supply port 45 Hydraulic cylinder 46 Piston rod 49 Fixing bracket 60 Hydraulic booster

Claims (7)

(57) [Scope of request for utility model registration] 1. A clamping device for fixing an object to be clamped to a board surface of a board-shaped member, comprising: a clamp body disposed on the board surface, a bottom surface of which is in contact with the board surface; and a clamp body formed at a front end of the clamp body. An output portion facing the board at an interval where a fixed portion of the object to be clamped is inserted; and a plurality of guide holes formed in the clamp body, elongated in the front-rear direction and perpendicular to the board, and arranged in parallel. A plurality of flanged bushes each having a flange portion inserted into the plurality of guide holes and locking the clamp body so as to be movable in the front-rear direction and not to float from the board surface; and A plurality of bolts that are inserted and screwed into bolt holes on the board surface to fix the flanged bush to the board surface, and are respectively mounted in the output sections orthogonal to the board surface, and the piston rod is moved toward the board surface. A plurality of hydraulic cylinders that can be advanced and driven, the plurality of hydraulic cylinders being arranged in a row in a direction orthogonal to the front-rear direction. 2. The guide hole is formed in a T-shaped cross-section that is open at the top of the clamp body and has a step.
The clamping device according to claim 1, wherein the flanged bush is configured to lock the step. 3. The guide hole is formed as a T-shaped hole that is not opened at the top of the clamp body and has a step, and the flanged bush is configured to lock the step. The clamp device according to claim 1, wherein the guide hole is opened at a front end or a rear end of the clamp body. 4. The clamp according to claim 1, wherein the output unit is provided with a hydraulic pressure supply port and an oil passage communicating with the hydraulic chambers of the plurality of hydraulic cylinders at the hydraulic pressure supply port. apparatus. 5. A front-rear-side hydraulic cylinder is provided inside the clamp body, and a front end portion of the piston rod extends outward from a rear end portion of the clamp body, and a front end side of the piston rod. 2. The clamp device according to claim 1, further comprising a fixture for fixing the portion to the board surface. 6. inside the clamp body, a plunger inserted into the plunger chamber which is communicated with the oil passage, wherein the hydraulic booster includes a hydraulic cylinder is provided for driving the plunger claims Item 5. The clamping device according to Item 4. 7. A clamp device for fixing an object to be clamped to a board surface of a board-shaped member, wherein the clamp body is arranged on the board surface, and a bottom surface is formed on a front end of the clamp body; An output section facing the board at an interval where the fixed portion of the object to be clamped is inserted; and a plurality of parallel sections which are formed in the clamp body, elongated in the front-rear direction and orthogonal to the board, and arranged in parallel. A plurality of bolt members each having a bolt head that is inserted into each of the plurality of guide holes and is screwed into a bolt hole of the board surface to lock the clamp body so as to be movable and not to float from the board surface; A plurality of hydraulic cylinders mounted in the output section orthogonal to the board surface and capable of driving the piston rod to clamp toward the board surface, the plurality of hydraulic cylinders being arranged in a row in a direction orthogonal to the front-rear direction; Clamping apparatus characterized by comprising a hydraulic cylinder, the.