CN201151054Y

CN201151054Y - Positioning clamp

Info

Publication number: CN201151054Y
Application number: CNU200720186595XU
Authority: CN
Inventors: 卢惠伦; 胡勇
Original assignee: NINGBO XINDA (GROUP) CO Ltd
Current assignee: NINGBO XINDA (GROUP) CO Ltd
Priority date: 2007-12-30
Filing date: 2007-12-30
Publication date: 2008-11-19
Anticipated expiration: 2017-12-30

Abstract

The utility model discloses a positioning clamp, which comprises a clamp body (11), a moving sealing base (2), a positioning mandrel (3), a positioning base (9), a tray (2), a limiting steel ball and a spring, wherein the positioning mandrel (3) is fixed under the tray (2) and is matched with the positioning base (9) in a sliding mode, the positioning base (9) is fixed on the clamp body (11), the moving sealing base is arranged in an oil cavity of the clamp body (11) and is connected with the positioning base (9) through the spring, the limiting steel ball is inlaid in a groove which is arranged on the positioning base (9), a hydraulic oil inlet valve component and a hydraulic oil spill valve component (14) are dismountably installed inside the clamp body (11), which are communicated with the oil cavity, thereby the service life of the clamp is greatly prolonged, and the clamp can be used on a corresponding digital control machine tool at any time through connecting, an air source station does not need to be built, the phenomena of rusting and clamping can be avoided, and the maintenance is convenient.

Description

Positioning fixture

Technical field

The utility model belongs to the Machining Technology field, relates to a kind of instrument of clamping workpiece to be processed, specifically is a kind of positioning fixture that is used for Digit Control Machine Tool.

Background technology

In field of machining, Digit Control Machine Tool is modal process equipment, and when processing work, the workpeople usually needs to use some clamping devices that processing work or object are carried out clamping, so that to the processing of workpiece or object.Because at present the Digit Control Machine Tool anchor clamps that adopt generally are to be power with large-scale source of the gas, this just needs to build large-scale supply station be used as gas supply station.Owing to have moisture content in the source of the gas, pneumatic linear actuator in use often enters piston because of uncleanly dust and airborne moisture content again, anchor clamps length service time one will produce get rusty stuck, use inflexible phenomenon.Use pneumatic linear actuator also usually owing to do not reach required air pressure cause the not opening hydrodynamic reciprocating sealing seat of cylinder, the patrix of anchor clamps just can not be realized replacing and corner like this.And when maintenance need whole disassembles, thereby cause maintenance difficult.

The utility model content

Technical problem to be solved in the utility model is, provides a kind of and need not build gas supply station, do not have the stuck phenomenon of getting rusty, the positioning fixture that is used on the Digit Control Machine Tool easy to maintenance.

For solving the problems of the technologies described above, a kind of positioning fixture that the utility model provides, comprise clamp body, hydrodynamic reciprocating sealing seat, positioning core axle, positioning pedestal, pallet, spacing steel ball, spring, described positioning core axle is fixed under the pallet, and be slidingly matched with positioning pedestal, described positioning pedestal is fixed on the clamp body, the hydrodynamic reciprocating sealing seat is located in the oil pocket of clamp body and with positioning pedestal and is connected by spring, spacing steel ball is embedded in the groove on the positioning pedestal, hydraulic pressure inlet valve assembly and hydraulic oil-returning valve module are housed in the described clamp body, and they all communicate with oil pocket.

After adopting above structure, because the pneumatic annular seal space oil pressure that changes into is used as the external force source, the seal oil chamber after the improvement has guaranteed the cleaning of anchor clamps, and extend service life greatly.Use but also can on corresponding Digit Control Machine Tool, connect at any time, do not need to build gas supply station, also do not have the phenomenon of getting rusty stuck and occur.What guaranteed also that certain pressure realizes patrix freely changes and corner convenient for maintaining.

Hydraulic pressure inlet valve assembly is housed in the described clamp body, be meant described hydraulic pressure inlet valve assembly, comprise the inlet valve spring, jacking block, end cover, cylinder sleeve, piston rod, the cylinder seat, connecting axle, handle, wherein, handle is rotationally connected by connecting axle and piston rod, piston rod and cylinder sleeve are slidingly matched, cylinder sleeve is positioned at the oil groove of clamp body, and be provided with a fuel sucking pipe, and an end of cylinder sleeve and cylinder seat matched in clearance, the cylinder seat is fixed on the clamp body, the other end of cylinder sleeve with end the cover contact and be connected, only be embedded on the oil suction chamber of clamp body, the end of its endoporus is tapered, and matches with jacking block, be with the inlet valve spring on the jacking block, the inlet valve spring withstands on the bottom surface of oil suction chamber, and oil suction chamber communicates with oil pocket by fuel feed hole, and the oil groove cover plate is fixed on the clamp body.After adopting such structure, can reach the effect that clamps and loosen more like a cork.

The hydraulic oil-returning valve module is housed in the described clamp body, be meant described hydraulic oil-returning valve module, comprise and adjust screw, valve seat, steel ball, oil return valve spring, wherein, valve seat is fixed in the clamp body, adjusts screw and is fixed in the valve seat, steel ball is positioned at valve seat and is connected with the contact of adjustment screw, one end of oil return valve spring withstands on the interior oil back chamber bottom surface of clamp body, and the other end abuts against on the steel ball, and oil back chamber communicates with oil pocket by spill port.After adopting such structure, can further guarantee easily to realize clamping of this positioning fixture and the effect of loosening.

Description of drawings

Shown in Figure 1 is the structural representation of former positioning fixture;

Shown in Figure 2 is the external structure schematic diagram of the utility model positioning fixture;

Fig. 3 is the A-A cutaway view among Fig. 2;

Fig. 4 is the partial enlarged drawing of the I portion of Fig. 3;

Fig. 5 is the B-B cutaway view among Fig. 2.

Wherein, in the utility model positioning fixture: 1, workpiece; 2, pallet; 3, positioning core axle; 4, hydrodynamic reciprocating sealing seat; 7, locating slot; 8, reference column; 9, positioning pedestal; 10, spring; 11, clamp body; 12, spacing steel ball; 13, hydraulic pressure inlet valve assembly; 14, release oil return valve assembly; 15, oil groove capping; 16, oil groove; 17, cylinder seat; 18, connecting axle; 19, handle; 20, piston rod; 21, cylinder sleeve; 22, fuel sucking pipe; 23, stop collar; 24, jacking block; 25, inlet valve spring; 26, oil suction chamber; 27, fuel feed hole; 28, adjust screw; 29, valve seat; 30, steel ball; 31, oil return valve spring; 32, oil back chamber; 33, spill port; 34, oil pocket.

In the former positioning fixture: 101, workpiece; 102, pallet; 103, positioning core axle; 104, hydrodynamic reciprocating sealing seat; 105, air admission hole; 106, air cavity; 107, locating slot; 108, reference column; 109, positioning pedestal; 110, spring; 111, clamp body; 112, spacing steel ball.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

By the structural representation of former positioning fixture shown in Figure 1 as can be known, former positioning fixture, comprise clamp body 111, hydrodynamic reciprocating sealing seat 104, positioning core axle 103, positioning pedestal 109, pallet 102, spacing steel ball 112, spring 110, described positioning core axle 103 is fixed on pallet 102 times, and be slidingly matched with positioning pedestal 109, described positioning pedestal 109 is fixed on the clamp body 111, hydrodynamic reciprocating sealing seat 104 is located in the air cavity 106 of clamp body 111 and with positioning pedestal 109 and is connected by spring 110, and spacing steel ball 112 is embedded in the groove on the positioning pedestal 109.Be shaped on an air admission hole 105 in the clamp body 111, communicate with air cavity 106.

Positioning core axle 103 is put into the hole of positioning pedestal 109, its locating slot 107 matches with fan-shaped reference column 108, after external air source enters into air cavity 106 from air admission hole 105, promptly be injected into below the hydrodynamic reciprocating sealing seat 104, certain pressure has just been arranged in the air cavity 106, and when discharging gas, pressure descends, make hydrodynamic reciprocating sealing seat 104 drive positioning core axles 103 and move down, utilize taper seat on the positioning core axle 103 to play the effect of clamping by spacing steel ball 112.

By the external structure schematic diagram of the utility model positioning fixture shown in Figure 2 as can be known, the utility model positioning fixture comprises clamp body 11, reference column 8, positioning pedestal 9, pallet 2, positioning core axle 3,

processing work

1 and 2 detachable connections of pallet, described positioning core axle 3 is fixed on pallet 2 times, described positioning pedestal 9 is fixed on the clamp body 11, plays location and rotatable 90 ° positioning action to pallet 2.Described hydraulic pressure inlet valve assembly 13 and hydraulic oil-returning valve module 14 are all detachable to be contained in the described clamp body 11.Described hydraulic pressure inlet valve assembly 13 is plunger hydraulic valve modules, plays the increase oil pressure in the design, and with the effect that impels hydrodynamic reciprocating sealing seat 4 to rise, and wherein plunger plays reciprocal oil suction and presses oily effect in assembly.Positioning core axle 3 not only plays the effect spacing and location in this positioning fixture, when also gyration is put into again after pallet 2 drive workpiece 1 take out from positioning pedestal 9, keep the constant effect of its origin of coordinates.Clamp body 11 plays in whole anchor clamps and is connected with lathe and oil storage, fixes the effect of other assembly.

By A-A, the B-B of Fig. 3, Fig. 4, the utility model positioning fixture shown in Figure 5 and locally amplify the sectional structure schematic diagram as can be known, the utility model positioning fixture also comprises hydrodynamic reciprocating sealing seat 4, spacing steel ball 12, spring 10, hydrodynamic reciprocating sealing seat 4 is located in the oil pocket 34 of clamp body 11 and with positioning pedestal 9 and is connected by spring 10, and spacing steel ball 12 is embedded in the groove on the positioning pedestal 9.

Described spring 10 plays the effect that compresses hydrodynamic reciprocating sealing seat 4 and make its return in the design, clamp and spacing action thereby control spacing steel ball 12.Positioning core axle 3 adopts the circular cone Positioning Principle, passes to the self-align conical surface of circular cone that spacing steel ball 12 passes to positioning core axle 3 again by the thrust of compressing spring 10, thereby produces self-lock force.Stopper slot 7 on the pallet 2 and circular cone positioning core axle 3 concentric High Accuracy and Divide scalloped bevel reference columns 8 can realize limiting the six-freedom degree of pallet 2.Thereby the swing offset up and down of positioning core axle 3 reaches the effect that the part location clamps, and satisfies the use of changing anchor clamps on the Digit Control Machine Tool fast.

Described hydraulic pressure inlet valve assembly 13 detachable being contained in the described clamp body 11 are meant described hydraulic pressure inlet valve assembly 13, comprise inlet valve spring 25, jacking block 24, stop collar 23, cylinder sleeve 21, piston rod 20, cylinder seat 17, connecting axle 18, handle 19.Wherein, handle 19 is rotationally connected by connecting axle 18 and piston rod 17, piston rod 17 is slidingly matched with cylinder sleeve 21, cylinder sleeve 21 is positioned at the oil groove 16 of clamp body 11, and be provided with a fuel sucking pipe 22, one end of cylinder sleeve 21 and cylinder seat 17 matched in clearance, cylinder seat 17 is fixed on the clamp body 11, and the other end of cylinder sleeve 21 is connected with stop collar 23 contacts, and stop collar 23 is embedded on the oil suction chamber 26 of clamp body 11, the end of its endoporus is tapered, and match with jacking block 24, being with inlet valve spring 25 on the jacking block 24, inlet valve spring 25 withstands on the bottom surface of oil suction chamber 26, oil suction chamber 26 communicates with oil pocket 34 by fuel feed hole 27, and oil groove cover plate 15 is fixed on the clamp body 11.According to general knowledge, seal between cylinder seat 17 and the clamp body 11, spill to prevent the hydraulic oil in the oil groove 16 on the clamp body 11.

The utility model utilize the lever plunger valve with hydraulic oil inject hydrodynamic reciprocating sealing seat 4 below, make it rise to the position of spacing steel ball 12, thereby make spacing steel ball 12 withdraw from spacing position, realized need not external source of the gas, adopt the mode of hydraulic pressure to reach the effect of dismantling reinforcement.

Described hydraulic oil-returning valve module 14 detachable being contained in the described clamp body 11 are meant described hydraulic oil-returning valve module 14, comprise adjusting screw 28, valve seat 29, steel ball 30, oil return valve spring 31.Wherein, valve seat 29 is fixed in the clamp body 11, adjusting screw 28 is fixed in the valve seat 29, steel ball 30 is positioned at valve seat 29 and is connected with 28 contacts of adjustment screw, one end of oil return valve spring 31 withstands on oil back chamber 32 bottom surfaces in the clamp body 11, the other end abuts against on the steel ball 30, and oil back chamber 32 communicates with oil pocket 34 by spill port 33.According to general knowledge, seal between valve seat 29 and the clamp body 11, spill to prevent the hydraulic oil in the oil groove 16 on the clamp body 11.

The hydraulic oil-returning valve module 14 of plunger valve front, it is the effect that the release check valve assembly has played the oil backflow that prevents that plunger valve from compressing into, that is to say the hydraulic oil that in this design, plays in control clamp body 11 oil grooves 16, thereby the rise and the falling of control hydrodynamic reciprocating sealing seat 4 reach the effect that clamps and unclamp positioning core axle 3.Wherein, steel ball 30 plays the effect of clamping and release, and adjusts the effect that screw 28 plays control steel ball 30 releases and backflow, and oil return valve spring 31 plays the effect that control steel ball 30 opens return.

During use, be fixed on this positioning fixture on the work top of Digit Control Machine Tool with pressing plate, positioning core axle 3 links with pallet 2, and pallet 2 links with workpiece or part, this assembly is put into the hole of positioning pedestal 4, and the locating slot 7 of pallet 2 matches with the fan-shaped reference column 8 of positioning pedestal 4, and this moment, the adjustment screw 28 with release oil return valve assembly 14 screwed out, steel ball 30 leaves seal under the effect of oil return valve spring 31, hydraulic oil has just been got back in the oil groove 16 on the clamp body 11.Hydrodynamic reciprocating sealing seat 4 moves down under the effect of hydraulic oil decline and spring 10 simultaneously, promotes the spacing place that spacing steel ball radially is moved down into positioning core axle 3, produce to clamp and drop-down power, thus clamping and positioning mandrel 3.At this moment screw in the adjustment screw 28 that compresses in the release oil return valve assembly 14.

When needs gyration processing parts, press lever handle 19, utilize plunger valve assembly 13 with the hydraulic oil in the oil groove on the clamp body 11 16 by 22 inspirations of the fuel sucking pipe on the cylinder sleeve 21 in the plunger valve assembly 13 and be pressed in the oil pocket 34 of clamp body 11.When the pressure of hydraulic oil during greater than the pressure of spring 10, hydrodynamic reciprocating sealing seat 4 begins to rise, and the sound up to hearing spacing steel ball 12 returns stops to suppress plunger valve handle 19, puts down after transfering to positioning core axle 3 to rotate 90 °.

Claims

1, a kind of positioning fixture, comprise clamp body (11), hydrodynamic reciprocating sealing seat (4), positioning core axle (3), positioning pedestal (9), pallet (2), spacing steel ball (12), spring (10), described positioning core axle (3) is fixed under the pallet (2), and be slidingly matched with positioning pedestal (9), described positioning pedestal (9) is fixed on the clamp body (11), hydrodynamic reciprocating sealing seat (4) is located in the oil pocket (34) of clamp body (11) and with positioning pedestal (9) and is connected by spring (10), spacing steel ball (12) is embedded in the groove on the positioning pedestal (9), it is characterized in that: hydraulic pressure inlet valve assembly (13) and hydraulic oil-returning valve module (14) are all detachable to be contained in the described clamp body (11), and they all communicate with oil pocket (34).

2, positioning fixture according to claim 1, it is characterized in that: described hydraulic pressure inlet valve assembly (13) is detachable to be contained in the described clamp body (11), be meant described hydraulic pressure inlet valve assembly (13), comprise inlet valve spring (25), jacking block (24), stop collar (23), cylinder sleeve (21), piston rod (20), cylinder seat (17), connecting axle (18), handle (19), wherein, handle (19) is rotationally connected by connecting axle (18) and piston rod (17), piston rod (17) is slidingly matched with cylinder sleeve (21), cylinder sleeve (21) is positioned at the oil groove (16) of clamp body (11), and be provided with a fuel sucking pipe (22), one end of cylinder sleeve (21) and cylinder seat (17) matched in clearance, cylinder seat (17) is fixed on the clamp body (11), the other end of cylinder sleeve (21) is connected with stop collar (23) contact, stop collar (23) is embedded on the oil suction chamber (26) of clamp body (11), the end of its endoporus is tapered, and match with jacking block (24), be with inlet valve spring (25) on the jacking block (24), inlet valve spring (25) withstands on the bottom surface of oil suction chamber (26), oil suction chamber (26) communicates with oil pocket (34) by fuel feed hole (27), and oil groove cover plate (15) is fixed on the clamp body (11).

3, positioning fixture according to claim 1, it is characterized in that: described hydraulic oil-returning valve module (14) is detachable to be contained in the described clamp body (11), be meant described hydraulic oil-returning valve module (14), comprise and adjust screw (28), valve seat (29), steel ball (30), oil return valve spring (31), wherein, valve seat (29) is fixed in the clamp body (11), adjusting screw (28) is fixed in the valve seat (29), steel ball (30) is positioned at valve seat (29) and is connected with adjustment screw (28) contact, one end of oil return valve spring (31) withstands on interior oil back chamber (32) bottom surface of clamp body (11), the other end abuts against on the steel ball (30), and oil back chamber (32) communicates with oil pocket (34) by spill port (33).