TWI627015B - Pneumatic chuck for improved stability - Google Patents

Abstract

A pneumatic chuck capable of improving stability, comprising a base unit, a slide unit mounted on the base unit, a clamp unit, and a pneumatic mechanism disposed on the base unit, the slide unit The utility model comprises a first sliding rail, an adjusting mechanism mounted on the base unit with the first sliding rail in a changeable position, and a second sliding rail spaced from the first sliding rail, and the clamping unit comprises Two slidable clips mounted between the first slide rail and the second slide rail, the pneumatic mechanism can drive the clip holders to fix a workpiece. The cooperation of the foregoing structure can reduce the slight deviation of the components during processing and the influence on the movement stability of the clamps.

Description

Pneumatic chuck for improved stability

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a collet, and more particularly to a pneumatic collet that utilizes gas to control the clamping action to improve stability.

In the past, in order to achieve the purpose of fixing a workpiece, a pneumatic chuck usually comprises a base, a slide rail mounted on the base, and two relatively movable clamps mounted on the slide rail. The collet also includes a pneumatic mechanism that utilizes gas to drive the clips closer and apart. Conventional pneumatic chucks use a single slide rail to guide the design of the movement of the clamps. Although the purpose of fixed workpieces can be achieved, if the clamps are to move smoothly, it is necessary to accurately match the slide rails. That is, in the past, the pneumatic chuck has a relatively high requirement for component accuracy, and does not allow slight tolerances. The limitation of this structure is not only high in manufacturing cost. Conversely, if the components are slightly offset during processing and assembly, the clips cannot move stably.

On the other hand, conventional monorail pneumatic chucks are usually provided with two parallel spaced side walls on each of the holders, and a guide groove between the side walls for the passage of the slide rails, the pneumatic clamp The head also has two rows of balls sandwiched between one of the side walls and the slide rail. According to the general mechanical principle, the greater the distance between the balls on the opposite side of the slide rail, the smaller the force of the balls, under the same torque. However, each ball of the conventional monorail type pneumatic chuck has only a point contact with the corresponding holder and the slide rail, and the load is small, and is located between the balls on the opposite side of the slide rail. The distance is also relatively small, so the force is relatively large.

It is an object of the present invention to provide a pneumatic chuck that provides improved stability that overcomes at least one of the disadvantages of the prior art.

The pneumatic chuck of the present invention is for fixing a workpiece, and comprises a base unit, a slide unit mounted on the base unit, a clamp unit, and a pneumatic mechanism disposed on the base unit The slide rail unit includes a first slide rail, an adjustment mechanism mounted on the base unit with the first slide rail in a changeable position, and a second slide rail spaced from the first slide rail. The clamp unit includes two slide seats mounted between the first slide rail and the second slide rail, and the pneumatic mechanism can drive the clamp brackets to fix the workpiece.

The beneficial effect of the present invention is that the first sliding rail and the second sliding rail are used to jointly clamp the clamping seats, and the adjustable distance between the first sliding rail and the second sliding rail can be accurately adjusted. The adjustment is suitable for clamping the distance of the holders, thereby reducing the slight deviation of the components during processing, and the influence on the movement stability of the holders.

Referring to Figures 1, 2 and 3, an embodiment of the pneumatic chuck of the present invention is used to secure a workpiece (not shown) and includes a base unit 1 and a slide unit mounted on the base unit 1. 2. A pneumatic mechanism 3 disposed in the base unit 1 and a clamp unit 4 that can drive the clamp unit 4 to switch between a working position and a release position.

The base unit 1 includes a first end seat 11 and a second end seat 12 spaced apart along a first direction 13 , and a first screw 11 is clamped to the first end seat 11 and the second end The base 10 between the seats 12. The first end seat 11 has a first abutment surface 111 facing the base 10, an end seat surface 112 spaced parallel to the first abutment surface 111, and a first vertical connection surface 111 and The vertical connection surface 113 of the end surface 112. The second end seat 12 has a second abutment surface 121 facing the base 10.

The base 10 has two side wall portions 14, 14' spaced along a second direction 19, and a connecting portion 15 connected to the bottom of the side wall portions 14, 14', at the side wall portions 14, 14' A sliding channel 16 is defined between the connecting portion 15 and the sliding channel 16 is parallel to the first direction 13. In the present embodiment, the first direction 13 is perpendicular to the second direction 19.

Referring to Figures 2, 4 and 5, the side wall portions 14, 14' of the present embodiment are similar in structure, and each side wall 14, 14' has an outer side surface 141 extending along the first direction 13, one and the outside. The side surfaces 141 are spaced apart from the inner side surface 142, and a rail assembly surface 143 extending horizontally from the bottom edge of the inner side surface 141 to the sliding passage 16. The side wall portion 14 further has a plurality of adjusting holes 144 extending through the outer side surface 141 and the inner side surface 142 and spaced along the first direction 13. In the embodiment, the adjusting holes 144 are in the form of screw holes.

Referring to Figures 2, 4 and 6, the connecting portion 15 has two side end faces 151 spaced along the first direction 13, an upper end face 152 facing the slip channel 16, and a lower end face parallel to the upper end face 152. 153, and two piston passages 154 extending through the side end faces 151, each piston passage 154 having a clamped intake end 155 and an open clamp intake end 156, the grip of the piston passages 154 The intake end 155 is located on the opposite side, that is, the clamped intake end 155 of one of the piston passages 154 is adjacent to the first end mount 11, and the clamped intake end 155 of the other piston passage 154 is adjacent to the second end mount 12 The opening of the open clamp inlet end 156 is also the same.

Further, the connecting portion 15 further has an assembling hole 158 extending upward from the lower end surface 153, and the assembling hole 158 is in communication with the piston passages 154. In this embodiment, the base unit 1 further has a plurality of leakage preventing rings 17 respectively sandwiched between the first end seat 11 and the base 10, and the second end seat 12 and Between the bases 10, each of the leak proof rings 17 surrounds the clamped intake end 155 and the open clamp intake end 156 of each piston passage 154, respectively.

Referring to Figures 2, 3 and 4, the slide rail unit 2 includes a first slide rail 21, a second slide rail 22 spaced parallel to the first slide rail 21, and an adjustable one of the first slide rails 21. An adjustment mechanism 23 mounted on one of the slide rail assembly faces 143 of the base 10, and a plurality of fixed rails 22 fixed to the other rail assembly surface 143 of the base 10 Fixing member 24. The first slide rail 21 has a pushing surface 211 facing the inner side surface 142 of the side wall portion 14 and a first guiding surface 212 facing the sliding passage 16 of the base 10, the first guiding The face 212 has a first guide groove 213 extending along the first direction 13.

The second sliding rail 22 has a second guiding surface 221 spaced apart from the first guiding surface 212. The second guiding surface 221 has a second guiding slot 222 spaced apart from the first guiding slot 213. . The adjusting mechanism 23 has a plurality of coupling members 231 for screwing the first sliding rail 21 to the side wall portion 14 of the base 10, and a plurality of adjusting holes 144 respectively screwed on the base 10 The adjusting member 232, the adjusting member 232 can push the first sliding rail 21 to move slightly along the second direction 19 by changing the screwing depth, and thus change the first sliding rail 21 and the The distance between the second slide rails 22.

Referring to Figures 4, 6, and 7, in the present embodiment, the pneumatic mechanism 3 includes two pistons 31 respectively mounted in the piston passages 154 of the base 10, and one of the assembly holes 158 of the base 10 is mounted. The guiding unit 32, a clamping intake passage 33, and an open clamp intake passage 33'. The clamp intake passage 33 and the open clamp intake passage 33' are both provided on the base unit 1. The pistons 31 are movable in the first direction 13 in the corresponding piston passages 154. Each of the pistons 31 has a plurality of slots 311 spaced along the first direction 13 and the guiding unit 32 has a shaft 321 and a rotatable gear 322 fitted over the shaft 321 which is engageable with the slots 311 of the pistons 31.

The clamping intake passage 33 allows gas to be fed into the respective piston passage 154 from the clamped intake end 155, and the open clamp intake passage 33' allows gas to pass from the open clamp intake end 156. Feed into the piston passages 154.

The clamped intake passage 33 has a first passage portion 331 corresponding to the base 10 and penetrating the side end faces 151, a second passage portion 332 corresponding to the first end seat 11, and a corresponding second end The third channel portion 333 of the seat 12 communicates with the second channel portion 332 and the third channel portion 333. The second channel portion 332 has a first inlet 334 on the end surface 112, a second inlet 335 on the vertical connection surface 113, and a first bonding surface 111. a first air inlet port 336 that communicates with the one of the clamping passages 155 of the piston passage 154, and the third channel portion 333 has a first communication port 155 that communicates with the clamping inlet port 155 of the other piston passage 154. Two inlets 337.

The configuration of the open clamp inlet passage 33' is identical to that of the clamp intake passage 33, except that the open clamp intake passage 33' is a gas that simultaneously introduces gas into the open clamp inlet end 156 of each piston passage 154. Since the structure is the same, it will not be explained.

Referring to Figures 2 and 4, the clamp unit 4 includes two guide seats 41 that pass through the base 10 and are respectively coupled with the pistons 31, and two clamps respectively mounted on the guide seats 41. a seat 42 and a plurality of friction reducing elements 43 respectively sandwiched between the clamping seat 42 and the first sliding rail 21 and between the clamping seat 42 and the second sliding rail 22.

Each of the clamping seats 42 has two sliding guiding surfaces 421 respectively facing the first sliding rail 21 and the second sliding rail 22 , and each sliding guiding surface 421 has a sliding direction along the first direction 13 . The guiding groove 423 and the guiding groove 423 respectively correspond to the first guiding groove 213 or the second guiding groove 222. Further, the anti-friction elements 43 are a plurality of the guide grooves 423 for mounting each of the holders 42 and the corresponding first or second guide grooves 213 or 222. In this embodiment, The equal-reduction elements 43 are in the form of rollers and each have two spaced apart cylindrical faces 431 and a surrounding surface 432 that is vertically connected between the cylindrical faces 431, with which the surrounding faces 432 and the cylindrical faces 431 are utilized. The vertical connection and the tilting erection can be used to accurately and without gaps of the friction reducing elements 43 in the corresponding guiding groove 423 and the first guiding groove 213, or corresponding to the guiding groove 423 and the Between the second guiding grooves 222, the friction reducing element 43 in the form of a roller can increase the contact area with the corresponding guiding groove 423, the first guiding groove 213 or the second guiding groove 222, so Conventional balls also have the effect of increasing the load.

Referring to Figures 1, 4, 6, and 7, in the embodiment, the pneumatic chuck is assembled by using the first slide rail 21, the second slide rail 22, and the friction reducing members 43 disposed on the left and right sides. The clamping seat 42, that is, the second sliding rail 22 is fixedly mounted on one of the sliding rail assembly surfaces 143 of the base 10 by the fixing members 24, and then the coupling member 231 is used to mount the clamping rail 42 The first slide rail 21 is mounted on the other rail assembly surface 143 of the base 10, and the first slide rail 21 is pushed up by a slight lateral displacement of the first slide rail 21 before being installed and unlocked. The clamping seats 42 are accurately mounted between the first sliding rail 21 and the second sliding rail 22 .

It is further noted that, in addition to the load increase of the roller-reducing element 43 in the form of a roller of the embodiment, the structure cooperates with the first slide rail 21 and the second slide rail 22 to clamp the structure. The structure of the clamp holder 42 can expand the distance between the friction reducing members 43 on the opposite side of the holder 42 under the same torque, due to the difference between the friction reducing members 43 on the opposite side. The greater the distance, the smaller the force of the friction reducing element 43 under the condition of the bending moment, so that the aforementioned structure can also extend the service life of the grinding reducing elements 43.

In the case of gas transportation, the present embodiment can connect a gas output source to the first inlet 334 or the second inlet of the clamping inlet passage 33 and the opening and closing inlet passage 33' as needed. At 335, after the pneumatic chuck is installed, if there is a space in front of the end seat surface 112 of the first end seat 11, the gas output source can overlap the clamping air inlet passage 33 and the open clamp. The first inlet 334 of the inlet passage 33' is closed and the second inlet 335 is closed. If there is no space in front of the end seat surface 112 of the first end seat 11 after installation, the gas output source may be overlapped between the clamping intake passage 33 and the second of the open clamp intake passage 33'. The inlet 335 is closed and the first inlet 334 is closed, thereby improving the ease of assembly.

When the gas output source is coupled to the clamped intake passage 33 and the open clamp intake passage 33', if gas enters through the clamped intake passage 33, the gas will be respectively indicated via arrows as shown in FIG. The clamping inlet end 155 of the piston passage 154 enters, and the piston 31 is driven by the gas in the piston passage 154 to move the clamping seat 42 in a fixed direction and fix the Processing the object (not shown), conversely, if the gas enters through the open clamp inlet passage 33', as shown by the arrow in Fig. 6, the clamp holder 42 will be moved to a release direction opposite to the fixed direction. In this way, the purpose of driving the clips 42 to fix and release the processed objects by gas can be achieved.

As can be seen from the above description, the present invention utilizes the first slide rail 21 and the second slide rail 22 which are spaced apart to clamp the clamps 42 and the friction reducing elements 43 in the form of rollers. The structure is not only novel, but also the second sliding rail 22 is adjusted to make the clamping seat 42 more accurately between the first sliding rail 21 and the second sliding rail 22. The cooperation of the foregoing structure can not only reduce the requirement for processing precision of components, but also improve the convenience of manufacture, and can also improve the smoothness of component actuation. In addition, the present invention provides the first inlet 334 and the second inlet 335 perpendicular to each other on the clamping air inlet passage 33 and the opening air inlet passage 33', and the pneumatic chuck can be improved in installation. The convenience of the time, the present invention is indeed a novel and practical product.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> 1·········· Base unit 10······ ·· pedestal 11········· The first end seat 111······· The first mating surface 112······· The end seat surface 113······· Vertical connection surface 12········ Second end seat 121······ Second bonding surface 13········ First direction 14········ Side wall Part 14'······· Side wall part 141······ Outer side 142······ Inner side 143······ Slide rail assembly surface 144······ Adjustment hole 15········ Connection part 151······ Side end surface 152······ Upper end surface 153······ Lower end surface 154······ Piston passage 155·· ···· Clamping the intake end 156······ Opening the inlet end 158······ Assembling the hole 16······························································· · Leakproof ring 19··························································································· · The push surface 212······ The first guide surface </td><td> 213······ One guide groove 22········ Second slide rail 221······ Second guide surface 222······ Second guide groove 23········ Adjustment mechanism 231······ Binding parts 232······ Adjusting parts 24········ Fixing parts 3·················································· · Pistons 311······· Tooth grooves 32········ Guide unit 321······ Shaft 322··································································· Clamping the intake passage 33'······· Opening the intake passage 331······ The first passage portion 332······ The second passage portion 333······ Third Channel portion 334······ The first inlet 335······ The second inlet 336······ The first air inlet 337······ The second air inlet 4····· ····· Clamping unit 41········ Guide seat 42········ Clamping seat 421······ Sliding guide surface 423······ 43························································································

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a partial exploded perspective view of one embodiment of a pneumatic collet of the present invention; Another partial exploded view illustrating the relative relationship of a base of the pneumatic chuck, a clamping unit and a sliding rail unit; FIG. 3 is a top view of the embodiment; FIG. 4 is a 4-4 along FIG. Figure 1 is a front view of the embodiment; Figure 6 is a cross-sectional view taken along line 6-6 of Figure 5; and Figure 7 is taken along line 7-7 of Figure 5. A section view.

Claims (10)

A pneumatic chuck for fixing a workpiece, and comprising: a base unit; a slide unit including a first slide rail, and a first slide rail mounted to the base unit in a changeable position An upper adjustment mechanism, and a second slide rail spaced from the first slide rail and mounted on the base unit; a clamp unit including two slideably mounted on the first slide rail and the second a clamping seat between the sliding rails; and a pneumatic mechanism disposed on the base unit and capable of driving the clamping members to fix the workpiece. The pneumatic chuck of claim 1, wherein the base unit has at least one adjustment hole, the first slide rail has a push surface adjacent to the at least one adjustment hole, and the adjustment mechanism of the slide rail unit a plurality of coupling members fixed to the base unit fixed to the first sliding rail, and at least one adjustable screwing depth mounted in the adjusting hole and abutting against the first sliding rail Face adjustments. The pneumatic collet of claim 1, wherein the first slide rail has a first guiding surface adjacent to the clamping seat, the first guiding surface having a first extending along a first direction a guiding groove, and the second sliding rail has a second guiding surface adjacent to the clamping seat, the second guiding surface has a second guiding groove corresponding to the first guiding groove; each clamping seat has Two sliding guide surfaces respectively adjacent to the first guiding surface of the first sliding rail and the second guiding surface of the second sliding rail, each sliding guiding surface has a adjacent first guiding slot Or the guiding groove of the second guiding groove, and the clamping unit further comprises a plurality of respectively respectively disposed in the first guiding groove and the corresponding guiding groove, and the second guiding groove and the corresponding guiding groove Internal grinding reduction component. The pneumatic collet of claim 3, wherein the base unit has at least one adjustment hole, the first slide rail has a push surface adjacent to the at least one adjustment hole, and the adjustment mechanism of the slide rail unit a plurality of coupling members fixed to the base unit fixed to the first sliding rail, and at least one adjustable screwing depth mounted in the adjusting hole and abutting against the first sliding rail Face adjustments. The pneumatic collet of claim 4, wherein the base unit includes a base having the adjustment hole, and a first end seat and a second end seat mounted on opposite sides of the base, the base The seat also has two spaced apart piston passages, and the pneumatic mechanism includes two pistons respectively mounted in the piston passages and respectively coupled with the clamps, and a gas for introducing gas into the piston passages Holding an intake passage, an open clamp intake passage; when the gas enters through the clamped intake passage, the pistons are driven to move in a fixed direction by the pistons, and the workpiece is fixed, and When the gas enters through the open clamp intake passage, the clamps will move the clamps in a release direction. The pneumatic collet of claim 5, wherein the first end seat has a first abutment surface that fits the base, an end seat surface that is spaced from the first abutment surface, and a vertical a vertical connection surface connected between the first bonding surface and the end seating surface, and the clamping air inlet channel and the opening clamping air inlet channel each have a first inlet disposed on the surface of the end seat, and a second inlet disposed on the vertical joint surface. The pneumatic chuck according to claim 6, wherein the clamping air inlet passage and the opening air inlet passage have a first passage portion corresponding to the base, a corresponding first end seat, and the same a second passage portion of the inlet and the second inlet, and a third passage portion corresponding to the second end seat, the second passage portion further having a first air inlet for feeding the gas into one of the piston passages, The third passage portion has a second air inlet for feeding the gas into the other piston passage, and the first air inlet and the second air inlet are located on opposite sides of the base. The pneumatic chuck according to claim 5, wherein the base has two side wall portions which are spaced apart and are respectively assembled for the first slide rail and the second slide rail, and one is connected between the side wall portions And connecting the connecting portions of the piston passages, and defining a sliding passage between the side wall portions and the connecting portion for the sliding of the clamping seats. A pneumatic chuck according to claim 8, wherein the clamp unit further comprises two guide seats respectively passing through the base, each of the guide seats being respectively connected to the corresponding holder and the piston. The pneumatic chuck according to any one of the preceding claims, wherein the friction reducing elements are in the form of rollers and are obliquely mounted on each of the first guiding grooves and the corresponding guiding groove. And between each of the second channels and the corresponding channel, each of the grinding elements has two spaced cylinders and a surrounding surface connecting the cylinders.