JPH0748358Y2 - Clamping device for monopost magazine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a monopost magazine clamping device having a magazine that is rotatably supported by a cylinder that can be indexed and rotated by a cylinder that moves up and down along an upright column.

[Prior Art] There are various types of tool magazines that are installed for accommodating a large number of tool holders and automatically changing them on the spindle side of a machine tool. Although a normal type magazine is fixedly installed on the machine tool side, it may not be possible to install the magazine on the machine side due to vibration isolation, weight and space. In particular, when the number of tool holders to be stored is large, it is difficult to fix the tool holders on the machine side. The monopost magazine is a magazine separately placed around the machine, and is adopted as a substitute for the magazine fixedly installed on the machine side as described above.

As the structure of the monopost magazine, it stands in the center,
A pillar integrally formed with a piston, a cylinder that is inserted into the pillar and moves up and down by hydraulic pressure, a magazine that is rotatably supported by the cylinder so as to be indexed and rotatable, and a plurality of tool holders are housed on the outer periphery thereof, etc. It is composed of and. Further, a clamp device for stopping and holding the lifting cylinder at a predetermined position is additionally provided.

[Problems to be Solved by the Invention] In the case of the conventional monopost magazine, since hydraulic pressure is used for lifting and lowering the cylinder as described above, piping for connecting the cylinder chamber and the hydraulic pressure source is required. Since the pipe is connected to the ascending / descending cylinder, a flexible hose or the like and its joint are required, which causes a problem that the structure around the cylinder becomes complicated. Also, as a clamp device for stopping and holding the cylinder at a predetermined position, a device that grips and fixes the cylinder by hydraulic pressure by a brake device that surrounds the cylinder is adopted, which complicates the device structure and stabilizes the clamp function. There was also a problem with maintainability.

The present invention integrates the guide and vertical drive with a very simple structure to stably move the cylinder up and down, and mainly clamps the cylinder at a predetermined position by the spring force, which simplifies the device and improves stability and maintenance. It is an object of the present invention to provide a clamp device for a monopost magazine, which is designed to secure the property.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cylinder that is engaged with a piston formed by expanding the diameter of a columnar column that stands upright and moves up and down, and the cylinder. A clamping device for fixing the cylinder of a mono-post magazine having a magazine for storing a large number of tool holders on its outer periphery, which is pivotally supported for indexing to and fixed to the cylinder. A body body that closes at the lower end side and that is slidably supported by the column and functions as a cylinder; a clamp piston that is slidably supported in the body body in a direction perpendicular to the axis of the column; And a spring for urging the working piston so as to always press the piston against the contact surface side of the support, and the support has an oil passage communicating with the hydraulic source and the cylinder. And hydraulic fluid from a hydraulic source is alternately supplied into the body body,
The abutment surface of the support column constitutes a monopost magazine clamping device which is formed by flattening a part of the outer periphery of the support column.

[Operation] By providing the oil passage in the column, the hydraulic oil of the hydraulic source is supplied to the cylinder chamber through the column. Therefore, the structure of the apparatus can be simplified without using any external piping.
In addition, a part of the support pillar is flattened to form a flat portion, and the clamping piston is pressed by the biasing means such as a spring to clamp it, so that the structure is simplified and a stable clamping force is provided. Can be given. Further, since the device structure is simple, the maintainability is excellent.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, the schematic structure of the monopost magazine 1 will be described with reference to FIGS. 1 and 2.

A columnar elongated pillar 4 is erected on a floor 3 around a machine tool (not shown). A piston 5 having an outer diameter larger than the outer diameter of the column 4 is integrally formed in the middle portion of the column 4. Further, the outer periphery of the column 4 below the piston 5 forms a flat portion 6 which is partially flattened (as shown in FIG. 3). The column 4 above the piston 5 is formed to have a smaller diameter than the column below it. An oil passage 7 is formed through the center of the pillar 4. The lower side of the oil passage 7 communicates with a hydraulic pressure source 10 via a joint 8 and a pipe 9, and the upper opening of the oil passage 7 is closed by a plug 11. An oil passage 12 that is provided above the piston 5 so as to intersect with the oil passage 7 is opened and drilled on the outer peripheral side.

The cylinder 13 is inserted into the piston 5, the upper side of which is closed by a bush 14 which slidably engages with the support column 4, and the lower side of which is closed by a body body 15 of the clamp device 2 described later. Therefore, an upper cylinder chamber 16 and a lower cylinder chamber 17 are formed between the cylinder 13 and the piston 5. The oil passage 12 opens into the upper cylinder chamber 16.

Next, the magazine 18 will be described.

The circular frame-shaped magazine body 19 is pivotally supported by the cylinder 13 via a bearing 20. As shown in FIG. 2, the reduced diameter portion of the pull stud 22 of the tool holder 21 is inserted into the outer periphery of the tool holder 21, and a large number (16 in the figure) for suspending and supporting the tool holder 21 by its jaw portion. The groove 23 is recessed. A Geneva gear 24 having a number of teeth corresponding to the number of locking grooves 23 is fixed to the lower surface side of the magazine body 19.

On the other hand, a support plate 25 is fixed to the cylinder 13, and a pin roller 26 that meshes with the Geneva gear 24 is provided on the support plate 25.
Is supported. The pin roller 26 is connected to a motor 27 with a speed reducer, which is fixed below the support plate 25, and is indexed and rotated. By rotating the motor 27 for indexing, the magazine main body 19 is rotated one by one, the tool holder 21 engaged with the locking groove 23 is rotationally positioned at a predetermined position, and the arm 28 (not shown) of the automatic tool changer is shown. According to FIG. 2), the tool holder 21 in a predetermined position is moved to the spindle side.

Next, the structure of the clamp device 2 will be described mainly with reference to FIG.

The body main body 15 is composed of a ring portion 15a that surrounds and bends the support column 4 and a cylindrical portion 15b that is integrally connected to the ring portion 15a, and is fixed to the lower end of the cylinder 13 as shown in FIG. The ring portion 15a slidably engages with the column 4,
The flat portion 6 obtained by flattening a part of the outer circumference of the column 4 is the body body.
It is arranged so as to face the cylindrical portion 15b side of 15. A chamber 30 for accommodating a spring 29, which is one of pressing means, is formed inside the cylindrical portion 15b. The abutment tool 32 provided at the tip of the clamp piston 31 comes into contact with the flat portion 6 of the column 4, and the abutment tool 32 is provided.
32 is surrounded by a spring seat plate 33. Spring seat
A spring 29 that constantly presses the spring seat plate 33 and the abutment tool 32 toward the flat portion 6 side is interposed between 33 and the bottom surface of the chamber 30. The spring strength of the spring 29 is such that the pressing force of the abutment tool 32 abutting on the flat portion 6 has sufficient force to stop and hold the cylinder 13 at a predetermined position. The clamp piston 31 is slidably supported in a cylinder chamber 34 formed in the cylindrical portion 15b of the body 15 of the body. In addition, the pillar 4
As shown in FIG. 1, a hydraulic oil supply port 35 connected to the hydraulic pressure source 10 of the pipe 36 is formed in the cylinder chamber 34a near the side.

Next, the operation of this embodiment will be described in more detail.

When hydraulic oil of appropriate pressure is introduced from the hydraulic pressure source 10 into the oil passage 7 of the strut 4 through the pipe 9, the hydraulic oil rises in the oil passage 7 and is filled in the oil passage 7, and the oil passage 12 to upper cylinder chamber 16
Will be introduced in. Since the column 4 and the piston 5 are fixed at fixed positions, the hydraulic fluid is introduced into the upper cylinder chamber 16 so that the cylinder chamber 13 is lifted up and raised. Along with that, the magazine body 19 also rises. Further, the motor 27 is rotated and the Geneva gear 24 is indexed and rotated to index and position the desired tool holder 21 to a predetermined position as described above. That is, the tool holder 21 to be automatically replaced is positioned at a predetermined position by raising the cylinder 13 and indexing and rotating the magazine body 19.

Next, the operation of the clamp device 2 that stops and holds the cylinder 13 at a predetermined position will be described.

The hydraulic oil sent from the hydraulic pressure source 10 to raise the cylinder 13 is passed through the pipe 36 and the cylinder chamber 34 of the clamp device 2.
Introduced in a. As a result, the clamp piston 31
Is pressed in the left direction, and moves the abutment tool 32 provided at the tip of the clamping piston 31 in the left direction against the pressing force of the spring 27. As a result, the abutment tool 32 separates from the flat portion of the column 4 and the clamp is released. Therefore, as described above, the cylinder 13 moves up smoothly.
Since the cylinder 13 is lifted by introducing the hydraulic oil, the cylinder 13 stops being lifted when the supply of the hydraulic oil is stopped. At the same time, the supply of hydraulic oil to the clamp device 2 is stopped, and the hydraulic oil in the cylinder chamber 34a is discharged. Therefore, the clamp piston 31 moves to the right due to the reaction force of the spring 29, and the abutment tool 32 is supported. It is pressed against the flat portion 6 of 4. As described above, since the mounting strength of the spring 29 is formed from a member having a pressing force enough to stop and hold the cylinder 13 and the magazine 18 etc. which have been raised at that position, the magazine 18 is clamped at that position. Become.

The magazine 18 and the cylinder 13 can be easily lowered by releasing the clamping force of the clamp device 2 and discharging the hydraulic oil into the upper cylinder chamber 16.

[Effect of the Invention] According to the present invention, the following effects can be obtained.

1) Since the hydraulic oil is supplied to the cylinder chamber by the oil passage formed in the support column, a complicated piping structure as in the prior art is not required, and the device can be made compact and inexpensive. .

2) The clamping is performed exclusively by a pressing means such as a spring and does not utilize a hydraulic system, so that the structure is simple and a stable and reliable clamping force can be given.

3) The hydraulic oil used to move the cylinder and magazine and the hydraulic oil supply system for unclamping the clamping device are in sync with each other, so the clamping force acts when the cylinder stops ascending and the magazine, etc. It can be stopped surely.

[Brief description of drawings]

FIG. 1 is an axial sectional view of an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1 ... Monopost magazine, 2 ... Clamping device, 3 ...
… Floor, 4 …… Post, 5 …… Piston, 6 …… Flat part, 7,12 …… Oil passage, 8 …… Coupling, 9,36 …… Piping, 10 ……
Hydraulic power source, 11 …… Plug, 13 …… Cylinder, 14 …… Bush, 15 …… Body body, 16 …… Upper cylinder chamber, 17 ……
Lower cylinder chamber, 18 …… magazine, 19 …… magazine body, 20 …… bearing, 21 …… tool holder, 22 …… pull stud, 23 …… locking groove, 24 …… Geneva gear, 25 …… support plate , 26 …… pin roller, 27 …… motor, 28 …… arm, 29 …… spring, 30 …… chamber, 31 …… clamping piston, 32 …… abutment tool, 33 …… spring seat plate, 34 ……
Cylinder chamber, 35 ... Hydraulic oil supply port.

Claims (1)

[Scope of utility model registration request] 1. A cylinder that moves up and down by engaging a piston formed by expanding the diameter of a columnar column that stands upright, and a plurality of tools that are rotatably supported by the cylinder so as to be indexed and rotatable. A clamp device for fixing the cylinder of a monopost magazine having a magazine for accommodating a holder to a predetermined position, the cylinder being fixed to the cylinder and closing the lower end side thereof, and being slidably supported by the column as a cylinder. A functioning body body, a clamp piston slidably supported in the body body in a direction perpendicular to the axis of the column, and a biasing force for constantly pushing the clamp piston to the contact surface side of the column. A spring is provided, and an oil passage that connects the hydraulic pressure source and the cylinder is formed on the column, and hydraulic oil from the hydraulic pressure source is alternately supplied to the oil passage and the body body. Is, abutment surface clamping device monoposto magazine being formed by taking a flat part of the outer periphery of the column of the strut.