JP2009090356A - Boost apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a booster apparatus capable of greatly boosting the output of a pneumatic cylinder. <P>SOLUTION: The booster apparatus 1 outputs the cylinder thrust of the pneumatic cylinder 2 via a pair of toggle mechanisms 11a. 11b. The toggle mechanisms 11a. 11b comprise a driving link 4 which pivotally attaches one end via a link carrier 12 to a piston rod 23 of the pneumatic cylinder 2, a stationary side link 5 which connects the other end to the driving link 4. and pivotally attaches one end to an inner wall of a casing 10, and a moving side link 6 which connects the other end to the stationary side link 6, and pivotally attaches one end to an output bearing implement 13. The other end of the driving link 4 is pivotally attached to the front end of an extension piece 7 extended and formed from a pivotal attachment portion pivotally attaching the moving side link 6 at the stationary side link 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure boosting device that easily and greatly boosts a cylinder thrust of a pneumatic cylinder by a toggle mechanism.

  Many pneumatic cylinders are used as power sources for various industrial machines. For example, a hydraulic type is generally adopted as a power source of a press device used for material processing or the like, but a pneumatic cylinder is easier to handle and less expensive than a hydraulic type. . Therefore, for example, it is very beneficial to use a pneumatic cylinder as a power source for the press device.

  However, since the pressure of air pressure is lower than that of oil pressure, for example, in a press apparatus that requires a relatively large force such as punching, there is a risk of insufficient power to use a pneumatic cylinder as a power source. . Therefore, there has been a demand for a mechanism that generates a large thrust with a small pneumatic cylinder that uses less air.

  On the other hand, in a mold clamping device for injection molding, a toggle mechanism is used as means for increasing the mold clamping force of a mold. This toggle mechanism is normally configured as shown in FIG. That is, the toggle mechanism 500 attaches the end portion of the moving side link 554c attached to the movable platen 522 and the end portion of the fixed side link 554b attached to the fixed base 524 to each other, and attaches to the nut portion 552 of the screw shaft 544. The end of the attached drive link 554a is pivotally attached to an intermediate position of the fixed side link 554b.

When the screw shaft 544 is rotated by the servo motor and the nut portion 552 is advanced and retracted, the fixed link 554b and the movable link 554c are extended and bent by the drive link 554a, and the movable platen 522 is moved up and down to open and close the mold. Made. A large clamping force can be obtained by such a toggle mechanism 500. Therefore, if such a toggle mechanism 500 is connected to a pneumatic cylinder, a certain amount of pressure increase is expected. However, a further pressure increase is desired to use as a power source for the above-described press apparatus for performing punching and the like. By the way.
JP-A-9-155910

  The present invention has been made in view of the above circumstances, and provides a pressure increasing device capable of greatly increasing the output of a pneumatic cylinder and integrating an output shaft adjusting mechanism. Let it be an issue.

The pressure booster according to the present invention is
A pressure intensifying device that outputs a cylinder thrust of a pneumatic cylinder to an output bearing tool through a pair of toggle mechanisms,
The toggle mechanism includes a drive link in which one end is axially attached to a piston rod of a pneumatic cylinder via a link receiver, a fixed side link that connects the other end of the drive link and axially attaches one end to a fixed portion, A movable side link that connects the other end to the fixed side link and pivotally attaches one end to the output bearing;
The other end of the drive link is configured to be axially attached to the tip of an extension piece formed by extending from the axially attached portion where the movable side link is axially attached in the fixed side link.

  According to the above configuration, when the piston rod of the pneumatic cylinder is advanced, the distal end of the extension piece of the fixed side link is pushed by the drive link, and the fixed side link and the moving side link are extended from the bent state. The output bearing tool is pushed out (advanced) by the pushing force in which the cylinder thrust of the pneumatic cylinder is greatly increased. That is, in the fixed side link, the distal end of the extension piece pushed by the drive link is arranged to move outward from the axial position of the moving link. Therefore, by pushing the tip of the extension piece with the drive link, the cylinder thrust of the pneumatic cylinder can be greatly increased according to the length of the extension piece.

The extension piece in the fixed side link is preferably bent.
Thereby, when the fixed side link and the moving side link are extended, the arrangement space of the extension piece is secured. Further, by bending the extension piece, the extension piece can be formed longer, and the pressure increase of the cylinder thrust of the pneumatic cylinder can be further increased.

Provide a screw hole in the axial direction in the toggle output shaft attached to the output bearing tool, and provide an adjustment mechanism for screwing an adjustment bolt into the screw hole and rotating the adjustment bolt to expand and contract the toggle output shaft. Can do.
Thereby, the adjusting mechanism can be provided integrally with the toggle mechanism. The toggle output shaft can be easily expanded and contracted by rotating the adjusting bolt. For example, when a mold die plate is connected to the toggle output shaft, the bottom dead center of the mold can be easily adjusted.

  As described above, according to the present invention, the cylinder thrust of the pneumatic cylinder can be greatly increased according to the length of the extension piece, and a large thrust is generated by a small pneumatic cylinder with less air consumption. be able to. For example, even when a pneumatic cylinder is used as a power source for a small press device, it is possible to generate a large pressing force while keeping the press device small by incorporating this pressure increasing device.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a small press device as an example incorporating the pressure increasing device of the present invention. In the press apparatus X shown in FIG. 1, a pressure increasing device 1 is connected to a pneumatic cylinder 2 as a power source, and a movable side die plate 31 is connected to the pressure increasing device 1 among die plates to which a mold 30 is attached. Yes. The movable die plate 31 is slidably supported by a plurality of tie bars 33 installed between a support plate 34 attached to the pressure increasing device 1 and the fixed die plate 32.

In the pneumatic cylinder 2, a piston 22 and a piston rod 23 are accommodated in a rectangular cylinder case 21. The pneumatic cylinder 2 supplies air pressure to the cylinder chambers before and after the piston 22 so that the piston rod 23 is reciprocated.
The pressure booster 1 is provided with a pair of toggle mechanisms 11 a and 11 b in a rectangular cylindrical casing 10 having substantially the same diameter as the cylinder case 21. The piston rod 23 of the pneumatic cylinder 2 arranged in the casing 10 is connected to the input side of each toggle mechanism 11a, 11b, and the output bearing tool 13 accommodated in the casing 10 is connected to the output side thereof. Yes.

  Referring to FIG. 2 as well, the pair of toggle mechanisms 11a and 11b are arranged to face the left and right with respect to the axis of the pneumatic cylinder 2, and each toggle mechanism 11a and 11b is driven. A link 4, a fixed side link 5, and a moving side link 6 are provided. One end of the drive link 4 is axially attached to the link receiver 12 attached to the tip of the piston rod 23 of the pneumatic cylinder 2 by a pin P 1, and the other end is connected to the fixed side link 5. One end of the moving side link 6 is pivotally attached to the output bearing tool 13 by a pin P <b> 5 and the other end is connected to the fixed side link 5. The other end of the fixed link 5 is connected to the other end of the drive link 4 and the other end of the moving link 6, and one end of the fixed link 5 is pivotally attached to the inner wall of the casing 10 serving as a fixed portion by a pin P 3.

  That is, in the toggle mechanisms 11a and 11b, one end of the moving side link 6 is pivotally attached to the output bearing tool 13 by the pin P5, and is rotated around this one end. Further, one end of the fixed side link 5 is pivotally attached to the inner wall of the casing 10 with a pin P3, and is rotated with this one end as a fulcrum. The fixed link 5 is formed by extending an extension piece 7 extending inward by bending the other end of the movable link 6 from a shaft-attached portion that is fixed by a pin P4. A drive link is provided at the tip of the extension piece 7. The other end of 4 is configured to be pivotally attached by a pin P2. The extension piece 7 is bent inwardly at an obtuse angle (90 degrees or more and less than 180 degrees), and the angle θ is preferably set in the range of 105 degrees to 165 degrees, and further 135. Preferably. By bending the extension piece 7, an arrangement space for the extension piece 7 is secured when the fixed side link 5 and the moving side link 6 are extended.

According to the pressure increasing device 1 including the toggle mechanism 11 as described above, when the piston rod 23 of the pneumatic cylinder 2 is advanced, the tip of the extension piece 7 of the fixed side link 5 is pushed by the drive link 4 and the fixed side. The link 5 and the moving-side link 6 are extended from a state where they are bent at the respective shaft attachment positions (the positions of the pins P4), and the output bearing tool 13 is pushed out (from the state shown on the left side of the one-dot chain line in FIG. The movable die plate 31 is advanced. Thereby, the mold 30 is closed. At this time, since the moving side link 6 is constituted by a bifurcated link piece and the fixed side link 5 is axially attached between the link pieces (see FIG. 3), a part of the extension piece 7 is moved side link. 6, the stationary link 5 and the movable link 6 can be smoothly extended.
Next, when the piston rod 23 of the pneumatic cylinder 2 is retracted from this state, the distal end of the extension piece 7 of the fixed side link 5 is pulled by the drive link 4 so that the fixed side link 5 and the moving side link 6 are in the extended state. The output bearing device 13 is bent at the mutual shaft attachment position (position of the pin P4), and the output bearing tool 13 is pulled back (from the state shown on the right side to the state shown on the left side from the one-dot chain line in FIG. 2). Retreated. Thereby, the metal mold | die 30 opens. At this time, since the extension piece 7 is formed of a bifurcated link piece and the drive link 4 is axially attached between the link pieces (see FIG. 3), a part of the drive link 4 is bifurcated of the extension piece 7. And the fixed link 5 can be pulled smoothly by the drive link 4.
By repeating the above operation, a punching operation or the like is performed with the die 30 of the press device X.

  Then, the pair of toggle mechanisms 11a and 11b constituting the pressure increasing device 1 has the other end of the moving side link 6 pivoted to the fixed side link 5 by a pin P4, and this pivoted portion (of the pin P4) The other end of the drive link 4 is pivotally attached to the tip of the extension piece 7 of the fixed side link 5 extended from the position by a pin P2. As a result, when the piston rod 23 of the pneumatic cylinder 2 is advanced and the tip of the extension piece 7 of the fixed side link 5 is pressed by the drive link 4, the output bearing is generated by the pushing force in which the cylinder thrust of the pneumatic cylinder 2 is greatly increased. The tool 13 is pushed out (moved forward). That is, in the fixed side link 5, the distal end of the extension piece 7 pushed by the drive link 4 is arranged to move outward from the axis attachment position (position of the pin P 4) of the movement side link 6. Therefore, by pushing the tip of the extension piece 7 with the drive link 4, the cylinder thrust of the pneumatic cylinder 2 can be greatly increased according to the length of the extension piece 7. Further, since the extension piece 7 is bent at the fixed side link 5, the extension piece 7 can be formed longer and the pressure increase of the cylinder thrust of the pneumatic cylinder 2 can be further increased. As a result, a large thrust can be generated by the small pneumatic cylinder 2 with a small air consumption. For example, even when the pneumatic cylinder 2 is used as a power source of the small press device X, by incorporating the pressure increasing device 1, it becomes possible to generate a large pressing force while keeping the press device X small. .

  Referring to FIG. 1, a toggle output shaft 14 is attached to the output bearing tool 13, and the toggle output shaft 14 is connected to the movable side die plate 31 via an adjustment mechanism 8. . The adjustment mechanism 8 has an adjustment bolt 80 in which male screws that are oppositely threaded are engraved at both ends, one end of the adjustment bolt 80 is screwed to the toggle output shaft 14, and the other end is connected to the movable side die plate 31. And screwed into a nut 81 attached thereto. That is, the toggle output shaft 14 is provided with a screw hole H in the axial direction, and one end of the adjusting bolt 80 is screwed into the screw hole H. The thread groove of the screw hole H of the toggle output shaft 14 and the thread groove of the nut 81 attached to the movable die plate 31 are reverse threads. A dial 82 for rotating the adjustment bolt 80 is attached to the center position of the adjustment bolt 80.

  Therefore, when the adjustment bolt 80 is rotated in one direction by the dial 82, the toggle output shaft 14 and the movable die plate 31 approach each other, and when the adjustment bolt 80 is rotated in the opposite direction, the toggle output shaft 14 and The movable side die plate 31 is separated. By rotating the adjustment bolt 80 in this way, the toggle output shaft 14 is expanded and contracted to position the movable die plate 31, and the bottom dead center adjustment of the mold 30 can be easily performed. The movable die plate 31 is slidably supported by a plurality of tie bars 33 installed between a support plate 34 attached to the casing 10 of the pressure increasing device 1 and the fixed die plate 32. As a result, the adjustment bolt 80 is not rotated.

(Modification)
As a modification of the pressure booster 1, the pressure booster 1A shown in FIG. 3 is a position where the two toggle output shafts 14A and 14B in the output bearing tool 13 correspond to the installation positions of the left and right toggle mechanisms 11a and 11b. Is provided. As a result, the load balance applied to the left and right toggle mechanisms 11a and 11b is improved, and the movable side die plate 31 is moved forward and backward by the toggle mechanisms 11a and 11b without tilting.

  Further, the adjusting mechanism 8A attached to the pressure increasing device 1A is configured such that the toggle output shafts 14A and 14B are simultaneously advanced and retracted by a worm mechanism. That is, the adjustment bolts 80A and 80B provided with the worm wheel 85 are assembled to the toggle output shafts 14A and 14B, respectively. These adjustment bolts 80A and 80B have one end on which a male screw is engraved at the movable side die plate. The other end of the toggle output shaft 14 </ b> A, 14 </ b> B fixed to 31 is screwed into the screw hole H, and the other end is rotatably attached to the output bearing tool 13. Then, a single worm shaft 83 having worm gears 86 formed at two locations so as to be engaged with the respective worm wheels 85 with respect to the two adjustment bolts 80A and 80B. The worm shaft 83 is pivotally supported at both ends by bearing portions U and U attached to the output bearing tool 13, and a tool corresponding portion 84 is formed on one end side thereof so as to protrude outward from the bearing portion U. Further, a window hole 15 is provided in the casing 10 corresponding to the tool corresponding portion 84 of the worm shaft 83, and the tool is engaged with the tool corresponding portion 84 of the worm shaft 83 through the window hole 15, so that the worm shaft 83 can be rotated.

Therefore, when the worm shaft 83 is rotated, the two adjustment bolts 80A and 80B meshing with the worm shaft 83 are simultaneously rotated. Then, the respective toggle outputs for screwing the male screws of the adjustment bolts 80A and 80B. The toggle output shafts 14A and 14B are simultaneously expanded and contracted at the screw holes H of the shafts 14A and 14B. Accordingly, the movable die plate 31 attached to the toggle output shafts 14A and 14B is positioned, and the bottom dead center adjustment of the mold 30 can be easily performed.
In addition, in the pressure increasing device 1 </ b> A, the adjusting mechanism 8 </ b> A is housed integrally with the toggle mechanism 11 in the casing 10. Accordingly, the pressure increasing device 1A is obtained in which the pressure increasing function of the pneumatic cylinder 2 and the expansion / contraction adjusting function of the toggle output shaft 14 are integrated.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the present invention. For example, the extension piece 7 of the fixed side link 5 connecting the drive link 4 may be formed to extend straight without being bent.

(Example)
Next, the pneumatic cylinder 2 was connected to the pressure booster 1 (toggle mechanism 11) of the present invention, and the pressing force of the toggle output shaft 14 was measured. Similarly, the pneumatic cylinder 2 having the same diameter was connected to the conventional toggle mechanism 500 shown in FIG. 5, and the pressing force at the toggle output portion was measured. The results are shown in the graph of FIG. As is clear from the graph, according to the pressure increasing device 1 of the present invention, the cylinder thrust of the pneumatic cylinder 2 can be increased more than the conventional toggle mechanism 500 from the start of pressing to the vicinity of the forward limit. . Moreover, the pressure increasing device 1 of the present invention exhibits a particularly large pressing force in the vicinity of the forward limit. Compared with the conventional toggle mechanism 500, in the pressure increasing device 1 of the present invention, the tip of the extension piece 7 (the position of the pin P2: force point) that applies the cylinder thrust by the drive link 4 is fixed in the fixed side link 5. It moves to the outside by the length of the extension piece 7 from the axis attachment position where the force is applied to the moving side link 6 (position of the pin P4: action point). As a result, the cylinder thrust can be greatly increased in accordance with the length of the extension piece 7 to increase the pressing force at the toggle output shaft 14. Therefore, according to the pressure increasing device 1 of the present invention, the cylinder thrust of the pneumatic cylinder 2 can be increased by about 6 to 10 times according to the length of the extension piece 7.

It is a partial sectional view showing a schematic structure of a press apparatus incorporating a pressure booster according to an embodiment of the present invention. It is a partial cross section figure for showing operation of a toggle mechanism which constitutes a pressure booster by an embodiment. It is a partially notched perspective view for showing the modification of the pressure booster by embodiment of this invention. It is the graph which compared the pressing force of the toggle output shaft in the booster of this invention with the pressing force in the toggle output part by the conventional toggle mechanism. It is sectional drawing which shows the structure of the toggle mechanism currently used for the mold clamping mechanism of an injection molding machine as a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Pressure booster 2 Pneumatic cylinder 4 Drive link 5 Fixed side link 6 Moving side link 7 Extension piece 8, 8A Adjustment mechanism 10 Casing 11a, 11b Toggle mechanism 12 Link support 13 Output bearing tool 14, 14A, 14B Toggle Output shaft 23 Piston rod 31 Movable side die plate 32 Fixed side die plate 34 Support plate 80, 80A, 80B Adjustment bolt 81 Nut 82 Dial 83 Worm shaft H Screw holes P1 to P5 Pin X Press device

Claims (3)

A pressure intensifying device that outputs a cylinder thrust of a pneumatic cylinder to an output bearing tool through a pair of toggle mechanisms,
The toggle mechanism includes a drive link in which one end is axially attached to a piston rod of a pneumatic cylinder via a link receiver, a fixed side link that connects the other end of the drive link and axially attaches one end to a fixed portion, A movable side link that connects the other end to the fixed side link and pivotally attaches one end to the output bearing;
The pressure increasing device has a configuration in which the other end of the drive link is attached to the tip of an extension piece formed to extend from the attachment portion where the movable side link is attached to the fixed side link. The pressure intensifier device according to claim 1,
The extension piece in the fixed side link is a pressure increasing device formed by bending. The pressure increasing device according to claim 1 or 2,
The toggle output shaft attached to the output bearing tool is provided with a screw hole in the axial direction, an adjustment bolt is screwed into the screw hole, and an adjustment mechanism is provided to rotate the toggle output shaft by rotating the adjustment bolt. Booster device.

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