JPH058041Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an opening/closing device for a vertically movable cover of a splash guard. It is used as an opening/closing device for the vertically movable cover of the splash guard installed as a powder scattering prevention member.

[Conventional technology]

A specific example of the conventional device will be explained based on FIG. 4. FIG. 4 shows a schematic side view of a horizontal machining center 2 equipped with a splash guard 1 as an example of a machine tool. In the figure, 3 is the spindle head,
4 indicates a work fixing table. The workpiece is mounted and fixed on a pallet (not shown) before being introduced into the horizontal machining center 2, and when the machined workpiece that has been cut according to the computer program is carried out from the horizontal machining center 2, the machined workpiece Instead, each pallet is fed onto the table 4 and waits for the start of cutting in a fixed position. This exchange operation between processed workpieces and unprocessed workpieces is carried out in an automatic and unmanned manner under computer control using an automatic pallet exchanger, similar to the cutting process of workpieces. As an oil splash prevention device, it is necessary to automatically open and close the front opening of the splash guard 1 installed around the spindle head 3 and the workpiece fixing table 4 in accordance with the workpiece machining program. At the front opening of the splash guard 1, as shown in FIG. 4, the automatic opening/closing device includes a guide rail 5, a vertically movable cover 6, a wire or chain 9, guide rollers 7, 7, and an air cylinder device 8. A movable cover device 10 is provided.

[The problem that the idea aims to solve]

The vertically movable cover 6 moves upwardly along the guide rail 5 by alternately introducing air into the backward side air chamber and the forward side air chamber of the piston rod 8a of the air cylinder device 8 when replacing the workpiece. Repeat the downward motion.

By the way, the conventional movable cover device 10 uses an upright air cylinder device 8 as a drive source for the vertically movable cover 6, and also uses approximately two cylinders of the vertically movable cover 6 as a guide member for the vertically movable cover 6. A guide rail 5 with double height, a guide roller 7,
wire or chain 9 wound around 7
, it is necessary to secure a cover storage space above the front opening of the splash guard 1 that is approximately equal to the height of the vertically movable cover 6, which complicates the driving device for the vertically movable cover 6. In addition, the increase in the height of the splash guard 1 impedes the ability to make the horizontal machining center 2 more compact. In addition, since the vertically movable cover 6 is lowered by its own weight, the lowering speed is restricted, and slack occurs in the wire or chain 9 that suspends and supports the vertically movable cover 6, resulting in impact load. It has also been recognized that the life of the wire or chain 9 is shortened due to repeated loading.

[Means to solve the problem]

As a means of solving the above problems, the present invention provides an opening/closing device for a cover that is attached to the front surface of a splash guard that surrounds the main body of a machine tool so that it can move up and down and can be opened and closed. a roller, a guide rail which is vertically installed over the entire length of the vertical movement range of the cover while sandwiching the roller from the sides, and a swinging center axis which is pivotally supported on the main body side of the splash guard; A swinging arm having a tip pivotally attached to the inside of the upper part of the cover, and a tip of a piston rod pivoting to the longitudinal middle part of the swinging arm, and swinging toward the main body of the splash guard. A fluid pressure cylinder device having a central shaft supported pivotally, and a tip portion pivoted on the swing arm between a pin pivot point of a piston rod of the fluid pressure cylinder device and a pin pivot point of the swing arm. In addition, there is provided an opening/closing device for a vertically movable cover of a splash guard, characterized in that it is composed of a pair of left and right gas dampers whose base ends are pivotally connected to the main body side of the splash guard by a pin. It is something to do.

[Effect]

A vertically movable cover is attached to the front surface of a splash guard that surrounds the main body of a machine tool, such as a horizontal machining center, via an upright guide rail, and a roller attached to the lower end of the vertically movable cover is fitted into the guide rail. At the same time, as a driving means for this vertically movable cover, the center of the swing is placed on the main body side of the splash guard, and the tip of the vertically movable cover is pin-jointed on a swinging arm. Prepare a pressure cylinder device and gas damper. By forming a link mechanism with these fluid pressure cylinder devices, the gas damper, and the swing arm, when a working medium, such as air, is introduced into the air chamber on the forward side of the piston rod of the fluid pressure cylinder device, the vertical movement type A roller attached to the lower end of the cover rises linearly within the guide rail, and the upper end of the vertically movable cover moves in an arcuate trajectory through the pivoting movement of the swing arm. After completing the exchange of the processed workpiece and the unprocessed workpiece, the air flow path is switched and air is introduced into the air chamber on the backward side of the piston rod of the fluid pressure cylinder device. As a result, the vertically movable cover descends at high speed under the action of the gas damper, tracing a movement trajectory opposite to the above-mentioned movement direction, and closes the front opening of the splash guard.

〔Example〕

FIG. 1 is a schematic top view of a horizontal machining center showing a specific example of the present invention, FIG. 2 is a schematic side view thereof,
FIG. 3 is an enlarged side view of the main part. As seen in these drawings, horizontal machining center 2
A splash guard 1 is installed around the main body of the machining center, including the spindle head 3 and the workpiece fixing table 4, as a surrounding body to prevent cutting oil and chips from scattering.
has been set up. A main body of a cover 11 is attached to the front opening of the splash guard 1 so as to be able to open and close freely and move up and down via side end support by an upright guide rail 12. A pair of left and right rollers 13, 13 are attached to the lower end of the cover 11. Corresponding to the rollers 13, 13, rollers 13, 13 are installed on the sides of the cover 11 over the entire length of its vertical motion range. Guide rails 12, 12 which are sandwiched from the sides are vertically provided with a predetermined spacing between them. Reference numeral 14 denotes a swing arm, which is composed of a U-shaped cover support frame 14a made of a square pipe that can withstand the bending load when the cover 11 moves up and down, and a swing center shaft 14b made of a round bar with high torsional rigidity. has been done. A portion near the upper end of the cover 11 is connected to the pins 15 and 1.
5 to the front end of the cover support frame 14a so as to be swingable. The cover support frame 1 extends in the front and back direction of the machining center 2
As shown in FIG.
The distal end portion of 6a is pivotally attached via a pin 17 so as to be swingable. The base end 16b of the air cylinder device 16 is connected to the swing pin 18 and the bracket 1.
The splash guard 1 is pivotally supported via a shaft 9 on the side wall of the main body of the splash guard 1 so as to be swingable. In FIG. 3, reference numeral 20 indicates a solenoid valve provided for switching the flow path of air flowing into the forward side air chamber and the backward side air chamber of the piston rod 16a of the air cylinder device 16. Further, 21, 21 is a gas damper or an air damper mounted for the purpose of stabilizing the operation of the cover 11, and its tip 21a is connected to the cover support frame 14a forming the swing arm 14.
Above, the piston rod 1 of the air cylinder device 16
It is pivotably supported via a pin 22 approximately midway between the mounting position of the pivot pin 17 of 6a and the pivot axis 14b. On the other hand, the base ends 21b, 21b of the air dampers 21, 21 are connected to the splash guard 1.
It is pivotally supported on the side wall portion of the main body via a second swing pin 23 and a bracket 24 so as to be swingable.

The swing arm 14, the air cylinder device 16,
The air dampers 21 and 21 constitute a driving device for the cover 11, and by forming a highly rigid link mechanism, constitute a swing-type movable support mechanism that is resistant to bending deformation and torsional deformation when the cover is raised and lowered. are doing.

The operating procedure of the device of the present invention will be explained below. When air is introduced into the forward air chamber of the piston rod 16a of the air cylinder device 16, the swinging arm 14 undergoes a swinging motion about the swinging center shaft 14b, causing the roller 1 attached to the lower end of the cover 11 to rotate.
3 and 13 rise linearly within the guide rails 12 and 12, and at the same time, the guide rails 12 and
The upper end of the cover 11, which is not engaged with the cover 12, moves along an arcuate trajectory through the pivoting movement of the swing arm 14. As a result, the front surface of the splash guard 1 becomes open, and a path for exchanging processed workpieces and unprocessed workpieces fixed on the pallet is prepared. When the replacement of the workpiece and the positioning and fixing work on the table 4 are completed, the air flow path is switched through the operation of the solenoid valve 20, and the piston rod 1 of the air cylinder device 16 is closed.
Air is introduced into the rearward side air chamber of 6a. As a result, the cover 11 moves the rollers 13 and 13 to the respective guide rails 12 and 13 under the operation of the air damper 21.
While sliding along the splash guard 12, the splash guard 1 descends at high speed while drawing a movement trajectory opposite to that of the rise, and closes the front opening of the splash guard 1. By closing the front opening of the main body of the splash guard 1, a sealed space suitable for preventing cutting oil and chips from scattering is formed around the spindle head 3 and workpiece fixing table 4 of the horizontal machining center 2.

[Effect of idea]

According to the present invention, the cover opening/closing operation is smooth;
Moreover, a cover opening/closing device is obtained which has a short time required for opening and closing the cover, has few failures, and has excellent operational stability. In addition, the tip of the piston rod of the fluid pressure cylinder device is pivotally supported at an intermediate position in the longitudinal direction of the swing arm via a pin, a gas damper is installed inside the piston rod, and a roller is attached to the lower end of the cover. A cover opening/closing device in which the lower end of the cover moves up and down linearly by being inserted into an upright guide rail, and the upper end of the cover moves in an arcuate curve as the swinging arm rotates. was formed. As a result, the storage space for the cover along the height direction is approximately halved compared to conventional equipment.
This is highly effective in reducing the external dimensions of machine tools, including splash guards. Moreover, it can be opened and closed in an extremely small space.

[Brief explanation of the drawing]

FIG. 1 is a schematic top view of a horizontal machining center showing a specific example of the present invention, FIG. 2 is a schematic side view thereof, and FIG. 3 is an enlarged side view of the main parts thereof. Also,
FIG. 4 is a schematic side view of a splash guard provided in a conventional horizontal machining center. 1...Splash guard, 2...Machine tool (horizontal machining center), 11...Cover, 12
... Guide rail, 13 ... Roller, 14 ... Swinging arm, 16 ... Fluid pressure cylinder device, (air cylinder device), 21 ... Gas damper (air damper).

Claims (1)

[Scope of Claim for Utility Model Registration] An opening/closing device for a cover that is attached to the front surface of a splash guard that surrounds the main body of a machine tool so that it can move up and down and can be opened and closed, and a roller attached to the lower end of the cover. , a guide rail that is vertically installed over the entire length of the vertical movement range of the cover with this roller sandwiched from the side, and a swing center axis that is pivotally supported on the main body side of the splash guard; A swinging arm having a tip pivotally attached to the inside of the upper part, a pivoting arm having a tip of a piston rod pivotably attached to the middle part in the longitudinal direction of the swinging arm, and a pivoting center shaft on the main body side of the splash guard. a fluid pressure cylinder device having a piston rod pivotably supported thereon; a tip portion pivotably mounted on the swing arm between a pin pivot point of a piston rod of the fluid pressure cylinder device and a swing center axis; It consists of a pair of left and right gas dampers whose base end is pivoted by a pin to the main body of the splash guard, and the upper end of the cover moves in an arcuate curve as the swing arm rotates. However, since the lower end of the cover moves linearly using a linear guide rail, the vertically moving cover opening/closing device of the splash guard is characterized in that it can be opened and closed in an extremely small space.