CN208495840U - Clamping device and numerical control vertical lathe - Google Patents

Abstract

The utility model relates to clamping devices and numerical control vertical lathe.Clamping device is for fixing workpiece to be processed, and clamping device includes: locating unit, and workpiece to be processed is sleeved on positioning unit；One driving unit, it is coaxially disposed with positioning unit and runs through positioning unit, wherein, driving unit can move back and forth on the axial direction of positioning unit, to squeeze positioning unit, and the diameter of positioning unit is caused to change, and in the increased situation of diameter of positioning unit, positioning unit tensioner in the inner cavity of workpiece to be processed.The utility model solves and can not be difficult to the technical issues of meeting related request to the run-out tolerance of workpiece to be processed accurate positioning, processing finished product in process, and clamping device itself is simple and convenient, the lifting workpiece time has been saved, the labor intensity of personnel is improved work efficiency and reduce.

Description

Clamping device and numerical control vertical lathe

Technical field

The utility model relates to digit ctrol machine tool fields, specifically, the utility model relates to clamping device and including this The numerical control vertical lathe of clamping device.

Background technique

Motor generally uses the cast iron end cap with bearing, has the bearing chamber for placing bearing on end cap and cooperates with base Seam allowance.End cap plays support rotary part, determine rotor and stator relative position, protection motor inside and lead wind action. The seam allowance processed herein is the seam allowance that client uses, and client is connect for installing motor with its own equipment using seam allowance.

Due to the motor of many types, such as IE3-1MB-0D-3B fire-proof motor B5/B14 class end cap Flange Plane and Seam allowance run-out tolerance requires height, and existing plant process is unable to satisfy drawing requirement, and assembly rear end cap flange seam allowance bounce can not expire Sufficient customer demand.

So that meet bounce to require, usually machining, but this place are carried out after by end cap assembly on motor Reason process environmental pollution is serious.In addition to this, specifically, since gap, dress are installed in the clearance of installation rear bearing and end face With post-processing, process is unstable (including axial float, radial imbalance), thereby results in end cover surface and is also easy to produce chatter mark, It causes to scrap.

In addition, generalling use the mode manually compressed when individually being processed to end cap and carrying out end cap flange face finishing Work.But this mode fixture seam allowance and end cap positioning spigot have gap, and end cap positioning spigot tolerance is larger, such end cap method Blue side seam allowance bounce is just unable to get stable guarantee.In addition manual compression low efficiency, lifting workpiece are inconvenient.

Utility model content

The utility model provides clamping device and numerical control vertical lathe, in process can not be to work to be processed for solution Part is accurately positioned, the run-out tolerance of processing finished product is difficult to the technical issues of meeting related request, and clamping device itself operates It is simple and convenient, improve work efficiency and reduce the labor intensity of personnel.

According to the one aspect of the utility model embodiment, clamping device is provided, clamping device is to be processed for fixing Workpiece, clamping device include: locating unit, and workpiece to be processed is sleeved on positioning unit；One driving unit, with positioning unit It is coaxially disposed and runs through positioning unit, wherein driving unit can move back and forth on the axial direction of positioning unit, to squeeze Positioning unit, and the diameter of positioning unit is caused to change, in the increased situation of diameter of positioning unit, positioning unit is to be added Tensioner in the inner cavity of work workpiece.

In this way, mechanical presses power is provided to change the diameter of positioning unit by driving unit, so that positioning Unit tensioner in the inner cavity of workpiece to be processed.Thus solve in process can not to workpiece to be processed be accurately positioned, The run-out tolerance of processing finished product is difficult to the technical issues of meeting related request, and clamping device itself is simple and convenient, section About the lifting workpiece time, improve work efficiency and reduce the labor intensity of personnel.

In the further illustrative embodiments of the clamping device of the utility model, clamping device further includes an abjection list Member, driving unit squeezes abjection unit towards positioning unit in reciprocating motion, and the diameter of positioning unit is caused to reduce, fixed Bit location is shunk in the lumen.

In this way, mechanical presses power is provided by driving unit, it can not only be in fixation procedure by positioning unit Tensioner is in the inner cavity of workpiece to be processed, moreover it is possible to during lifting workpiece conveniently and efficiently by the workpiece processed, Such as the electric motor end cap by cutting is removed from clamping device.

In the further illustrative embodiments of the clamping device of the utility model, driving unit includes: a pull rod, One end of pull rod, which is formed with, compresses disk；One connecting rod is formed with backstop disk in one end of connecting rod.Positioning unit, which is located at, compresses disk Between backstop disk, pull rod is axially through positioning unit and is fixedly connected with the connecting rod.

Herein, it pull rod and compresses disk and is integrated component, connecting rod and backstop disk are equally also integrated component, they can distinguish It is formed by whole bearing steel bar turning, to meet the intensity requirement of pull rod.For this pull rod and connecting rod, it is used for The pulling force of the lathe hydraulic cylinder drawn to it is set as 0.5Mpa~0.6Mpa or so.

In this way, in fixation procedure, for example during clamping workpiece to be processed, pull rod is carried out under axial direction The movement of drawing compresses disk extruding positioning unit to utilize；And backstop disk can provide during lifting workpiece to positioning unit Extruding force axially upwards, to actuate abjection unit.

In the further illustrative embodiments of the clamping device of the utility model, positioning unit includes: an expansion set；One Hollow conical core shaft, the mandrel base portion with cone and carrying cone.Expansion set is axially sleeved in cone.

In this way, expansion set and conical core shaft are applied in combination as swelling part.Expansion set is at top by axial pressure It is moved downward when power along conical core shaft, the structure that conical core shaft gradually increases radially struts expansion set, and the diameter of expansion set is caused to increase Greatly, finally expansion set is self-locking in conical core shaft.

In the further illustrative embodiments of the clamping device of the utility model, abjection unit includes: an ejection ring； At least one knock pin extends through mandrel base portion and is clamped between ejection ring and backstop disk.Ejection ring is axially sleeved on In cone, and between expansion set and mandrel base portion.

In this way, knock pin is by ejecting the extruding force of circumferential expansion set offer axially upwards, to keep expansion set de- From self-locking state, without manually being intervened.

In the further illustrative embodiments of the clamping device of the utility model, compress disk and expansion set not in contact with In the case of, expansion set is separated from each other in the axial direction with ejection ring；When compressing disk while contacting expansion set and conical core shaft, expansion set it is straight Diameter is maximum value.

In this way, expansion set by compress disk squeeze when axial movement distance be matched with diameter itself needs reach Rated value, to ensure to be firmly positioned on positioning unit to by workpiece to be processed.

In the further illustrative embodiments of the clamping device of the utility model, axis of the positioning unit in conical core shaft Rearward further include: a substrate carries mandrel base portion, and substrate has a center through hole and at least one eccentric through-hole；One main shaft Connecting plate, bearing substrate, main shaft connecting plate have the pilot hole around backstop disk.

Here, backstop disk is assembled the inner wall surrounding in hole, but not in contact with the inner wall.Main shaft connecting plate with machine tool chief axis When connection, the inside of pilot hole limits taper receiving portion, in order to which main shaft connecting plate is connect with main shaft nose, standard lathe master Axis nose is the short conical surface and big plane.

In this way, main shaft connecting plate provides the approach connecting with machine tool chief axis for clamping device, improves whole The installation convenience and control accuracy of a clamping device.

In the further illustrative embodiments of the clamping device of the utility model, positioning unit further include: protection ring, It is supported on mandrel base portion, radially around expansion set and ejection ring.Protection ring has radially-inwardly in the side away from substrate The annular flange of stretching, the area of a circle that annular flange limits are greater than the cross section of inner cavity.

In this way, protection ring provides circumferential protection for abjection unit.Due to having on protection ring axial direction top surface There is the annular flange radially-inwardly stretched out, therefore positioning unit can also be advantageously, protection is provided, and will not be to the fortune of expansion set Movable property is raw to be hindered.

In the further illustrative embodiments of the clamping device of the utility model, clamping device further include: fixed ring, It is supported on substrate and radially surround protection ring, the top edge of fixed ring is used as the positioning surface for workpiece to be processed； Backing pin, one end of backing pin are inserted in the location hole on top edge, in the hole of the other end insertion workpiece to be processed of backing pin.

In this way, under the action of expansion set, the seam allowance plane of workpiece to be processed, such as electric motor end cap and positioning are flat Face fits closely.In addition can be circumferentially positioned to workpiece to be processed progress by means of backing pin, to prevent workpiece from existing in process It is rotated on positioning unit.

In the further illustrative embodiments of the clamping device of the utility model, offered on the peripheral wall of fixed ring to A few relief port.

In this way, the coolant liquid or flushing liquor flowed into clamping device in process can be arranged successfully Out, it is ensured that the normal operation of clamping device.

In the further illustrative embodiments of the clamping device of the utility model, conical core shaft also has a mandrel convex It rises, mandrel protrusion is axially protruded into from mandrel base portion and is centrally located in through-hole；Connecting rod also has one to be formed in backstop disk On annular flange, annular flange and mandrel protrusion is opposite protrudes into center through hole.The free end of pull rod is in the axial direction Across mandrel protrusion and it is fixed in the groove that one is limited by annular flange.

In this way, conical core shaft is directionally fixed in a substrate using mandrel protrusion.Through the drawing of conical core shaft The free end of bar is limited in the groove on axial top of connecting rod, thus ensures that pull rod and connecting rod are fixed to one another company It connects.

In the further illustrative embodiments of the clamping device of the utility model, driving unit is hydraulic-driven list Member.

In this way, workpiece to be processed easily can be located in clamping device by means of hydraulic power by operator The workpiece processed can above and equally be removed rapidly and successfully from clamping device.

In the further illustrative embodiments of the clamping device of the utility model, expansion set has cone identical with cone Degree.

In this way, enable to expansion set rapidly and the accurately tensioner in the inner cavity of workpiece to be processed.

In the further illustrative embodiments of the clamping device of the utility model, taper is 12 degree.

In this way, it can satisfy the condition of self-locking of expansion set, to guarantee expansion set under the action of lateral cutting forces not Movement can be generated, while improving the stabilization and safety of process.Scope of " 12 degree " this numerical value in the utility model In be only one and test the numerical value that obtains.Consider in conjunction with processing environment, processing criterion and the margin of tolerance, which can have There is ± 1 degree of deviation.

It is maximum value in the diameter of expansion set in the further illustrative embodiments of the clamping device of the utility model When, expansion set is 10mm with the contact spacing of workpiece to be processed in the axial direction.

In this way, such as when being positioned to electric motor end cap, expansion set tensioner bearing chamber depth 10mm or so, Thus positioning was avoided." 10mm " this numerical value is only one and tests the numerical value obtained in the scope of the utility model.Knot Processing environment, processing criterion and the margin of tolerance are closed to consider, which there can be the deviation of ± 3mm.

Another aspect according to the present utility model, it is also proposed that numerical control vertical lathe, comprising: above-mentioned clamping device, wherein clamping dress The machine tool chief axis of the main shaft connecting plate and numerical control vertical lathe set connects；Controller issues digital control signal to clamping device.

In this way, clamping device, to fixed or release workpiece, is not necessarily to artificial locking pressure plate by digital control signal, Hence improve the operation convenience of entire numerical control vertical lathe.

In the embodiments of the present invention, mechanical presses power is provided by driving unit to change the straight of positioning unit Diameter, so that positioning unit tensioner in the inner cavity of workpiece to be processed.Thus solving in process can not be to work to be processed Part is accurately positioned, the run-out tolerance of processing finished product is difficult to the technical issues of meeting related request, and clamping device itself operates It is simple and convenient, the lifting workpiece time has been saved, the labor intensity of personnel is improved work efficiency and reduce.

Detailed description of the invention

Attached drawing forms part of this specification, and is used to help further understand the utility model.These attached drawings illustrate The embodiments of the present invention, and be used to illustrate the principles of the present invention together with specification.Identical component in the accompanying drawings It is indicated by the same numeral.It is shown in figure:

Fig. 1 shows the schematic, exploded of clamping device according to the present utility model；

Fig. 2 shows the schematic cross sectional views of clamping device according to the present utility model；

Fig. 3 shows the schematic block diagram of numerical control vertical lathe according to the present utility model.

Wherein, appended drawing reference is as follows:

10: clamping device；

20: controller；

30: workpiece to be processed；

100: positioning unit；

110: expansion set；

111: contact spacing；

120: conical core shaft；

121: cone；

122: mandrel base portion

123: mandrel protrusion

130: substrate；

131: center through hole；

132: eccentric through-hole；

140: main shaft connecting plate；

141: pilot hole；

150: protection ring；

151: annular flange；

200: driving unit；

210: pull rod；

211: compressing disk；

212:(pull rod) free end 220: connecting rod；

221: backstop disk；

222: annular flange；

223: groove；

300: abjection unit；

310: ejection ring；

320: knock pin；

400: fixed ring；

410: top edge；

420: location hole；

430: relief port；

500: backing pin.

Specific embodiment

In order to make those skilled in the art more fully understand the embodiment of the utility model, below in conjunction with the utility model Embodiment in attached drawing, the technical solution in the embodiments of the present invention is clearly and completely described, it is clear that institute The embodiment of description is only the embodiment of the utility model a part, instead of all the embodiments.Based on the utility model Embodiment, every other scheme obtained by those of ordinary skill in the art without making creative efforts, all The protection scope of the utility model should belong to.

It should be noted that the specification of the utility model and term " first " in above-mentioned attached drawing, " second " etc. are to use In distinguishing similar object, without being used to describe a particular order or precedence order.It should be understood that the data used in this way exist It can be interchanged in appropriate situation, so that the embodiments of the present invention described herein can be in addition to illustrating herein or describing Those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, it is intended that covering is not Exclusive includes, for example, the process, method, system, product or equipment for containing a series of steps or units be not necessarily limited to it is clear Step or unit those of is listed on ground, but may include do not list or it is intrinsic for these process, methods, product or equipment Other step or units.

Fig. 1 shows the schematic, exploded of the clamping device 10 of embodiment according to the present utility model, is shown here The positional relationship of all parts is described in one of assembling process embodiment.

In this specific embodiment, for fixing the clamping device of workpiece to be processed (being not shown in Fig. 1, referring to fig. 2) 10 include: positioning unit 100, abjection unit 300, and the driving unit for axially penetrating through positioning unit 100, deviating from unit 300 200.Driving unit 200 can move back and forth on the axial direction of positioning unit 100, to squeeze positioning unit 100, and cause The diameter of positioning unit 100 changes, and in the increased situation of diameter of positioning unit 100, positioning unit 100 is in workpiece to be processed Inner cavity in tensioner.

Positioning unit 100 includes expansion set 110, the hollow conical core shaft 120, substrate 130 that Fig. 1 axis is sequentially arranged upwards And main shaft connecting plate 140, wherein conical core shaft 120 includes the cone 121 of support expansion set 110 and the mandrel of carrying cone 121 Base portion 122.Mandrel base portion 122 is supported on substrate 130.

Driving unit 200 includes being presented axially in the pull rod 210 of 130 front side of substrate and positioned at 130 rear side of substrate Connecting rod 220.Pull rod 210 runs through expansion set 110 and conical core shaft 120 using the bar portion of itself.It is formed in 210 top of pull rod Extruding force can be applied to the top of expansion set 110 by compressing disk 211.Connecting rod 220 and pull rod 210 positioned at 130 rear side of substrate is solid Fixed connection.It is formed in the axial forward end of connecting rod 220 for the backstop disk 221 with the abjection effect connection of unit 300.

Deviating from unit 300 includes ejection ring 310 and four knock pins 320.Ejection ring 310 be sleeved in cone 121 and Positioned at the axial rearward direction of expansion set 110, knock pin 320 is along extending through mandrel base portion 122 and be clamped in ejection ring 310 and backstop disk Between 221.

Clamping device 10 includes indentation state and ejection state.Under indentation state, connecting rod 220 drives 210 axis of pull rod It to moving backward, compresses disk 211 and squeezes expansion set 110 towards substrate 130, this causes the diameter of positioning unit 100 to change, fixed In the increased situation of the diameter of bit location 100, the tensioner in the inner cavity of workpiece to be processed of positioning unit 100.Under ejection state, Connecting rod 220 drives pull rod 210 to be moved axially forwards, and backstop disk 221 is by knock pin 320 towards ejection ring 310 and expansion set 110 It squeezes, this causes the diameter of positioning unit 100 to reduce, and positioning unit 100 has been completed at this moment in the inner cavity of the workpiece of processing It shrinks.

Compress disk 211 and expansion set 110 not in contact in the case where, expansion set 110 does not connect in the axial direction with ejection ring 310 Touching；When compressing disk 211 while contacting expansion set 110 and conical core shaft 120, expansion set 110 connects each other in the axial direction with ejection ring 310 Touching, and the diameter of expansion set 110 is maximum value.

Positioning unit 100 further includes the protection ring 150 for surrounding expansion set 110 and ejection ring 310, and the protection ring 150 is to expansion set 110 and ejection ring 310 carry out circumferential protection.

Clamping device 10 further includes the axial top for surrounding the fixed ring 400 of protection ring 150 and being inserted into fixed ring 400 Backing pin 500 on portion edge 410.One end of backing pin 500 is contained in fixed ring 400 in preset location hole 420, other end energy It is inserted into the hole of workpiece to be processed, to prevent workpiece from rotating in process.

By means of backing pin 500, workpiece is enabled to bear circumference operating force, such as cutting force, guarantees that workpiece is not when roughing It can skid.The experiment proved that cutting at one time can successfully realize the cutting distance of 2mm, so that whole process is stablized, Improve processing efficiency.

Four relief ports 430 are also provided on the peripheral wall of fixed ring 400, for clamping device 10 will to be flowed into process In coolant liquid or flushing liquor be smoothly discharged.

As shown in Figure 1, fixed ring 400, protection ring 150 axially can in turn be set with and be fixed on positioning unit 100.

Fig. 2 shows the schematic cross sectional views of clamping device 10 according to the present utility model, herein in conjunction with Fig. 1 come to Fig. 2 into Row description.

The indentation state of clamping device 10 is shown in FIG. 2.Workpiece to be processed 30, such as electric motor end cap are placed on fixation On ring 400, the top edge 410 of fixed ring 400 is used as the positioning surface for workpiece to be processed 30.

The top for the positioning unit 100 being centrally located in clamping device 10 is located in the inner cavity of workpiece to be processed 30.It draws The disk 211 that compresses of bar 210 applies downward extruding force to the top of expansion set 110, so that the top surface of expansion set 110 and by expansion set 110 The top surface of the cone 121 of encirclement flushes.

As shown in Fig. 2, the diameter of expansion set 110 reaches maximum value, therefore the inner cavity of workpiece to be processed 30 is by complete tensioner, this When, expansion set 110 is 10mm with the contact spacing 111 of workpiece to be processed 30 in the axial direction.That is, being electricity in workpiece to be processed In the case where generator terminal lid, 110 tensioner bearing chamber depth 10mm of expansion set or so position to avoid crossing.

Protection ring 150 around expansion set 110 is supported on mandrel base portion 122.The top of protection ring 150 has radially-inwardly The annular flange 151 of stretching, the area of a circle that annular flange 151 limits are greater than the inner cavity of workpiece to be processed 30 in the present embodiment Cross section, thus make expansion set 110 in diameter maximum can't be by 151 radial compression of annular flange.Annular flange 151 exists This guide part as expansion set 110, to ensure that expansion set 110 can be along the successfully axially reciprocating of cone 121.

The difference of type and application environment herein according to applied expansion set can reasonably adjust annular flange 151 The area of a circle limited.In the embodiment that workpiece to be processed is electric motor end cap, limit value is provided by expansion set producer, and is protected The diameter of ring is 0.5mm bigger than the bearing chamber diameter of electric motor end cap to be processed or so.

Substrate 130 has center through hole 131 and four eccentric through-holes 132, and a bias is only symbolically shown in Fig. 2 Through-hole 132.The mandrel protrusion 123 of 120 bottom of conical core shaft axially protrudes into from mandrel base portion 122 and is centrally located through-hole In 131, so as to utilize mandrel protrusion 123 and the shape cooperation of center through hole 131 to realize conical core shaft 120 and substrate 130 It is located opposite to each other.

In unshowned embodiment, conical core shaft and substrate are fixedly secured to one another by means of bolt realization, so as to basis Need to come the bounce situation of appropriate adjustment conical core shaft.

It is arranged with main shaft connecting plate 140 in substrate 130, bearing substrate 130 in axial direction.Main shaft connecting plate 140 has There is the pilot hole 141 of circular backstop disk 221, wherein the area of pilot hole 141 is greater than the area of backstop disk 221.Main shaft connecting plate 140 provide the approach connecting with machine tool chief axis for clamping device 10.

It is located at the connecting rod 220 below pull rod 210 in Fig. 2 by the annular flange 222 and pull rod 210 of itself in center Connection in through-hole 131.Annular flange 222 protrudes axially upwards from backstop disk 221, and limits the groove 223 in center.Pull rod 210 free end 212 protrudes into groove 223.Here, internal screw thread can be provided on the inner wall of groove 223, and pull rod 210 Free end 212 on be provided with external screw thread, by means of the threaded connection of internal and external threads with by pull rod 210 and connecting rod 220 that This connection, thus prevents radial deflection during axial movement of pull rod 210.

Driving unit 200 is hydraulic drive unit, and the free end of connecting rod 220 will obtain hydraulic from hydraulic power assembly Power is transferred to pull rod 210, to drive pull rod 210 to carry out reciprocal axial movement.

Expansion set 110 has taper identical with cone 121.The determination of taper depends on the friction of expansion set 110 and cone 121 Factor.

According to formula: f=Fn* μ=N*cos θ * μ=N*sin θ, wherein μ is static friction factor, and θ is critical inclination angle, when When practical bevel angle α < θ, N*sin α < N*cos α * μ, i.e., no matter N is much, and object will not slide on inclined-plane.It is practical new at this In the scope of type, in the case where steel and steel static friction factor take 0.15, θ=8.53 are obtained according to formula θ=arctan μ, i.e., Oblique angle < 8.53 is able to satisfy condition of self-locking.

In the present embodiment, taper is 12 degree, and oblique angle is 6 degree, thus meets the condition of self-locking of expansion set.

The knock pin 320 shown in fig. 1 and 2, the eccentric through-hole 132 for accommodating knock pin and relief port 430 Quantity be only illustrative.According to the actual application, their quantity can be one, two or more.

Fig. 3 shows the schematic block diagram of numerical control vertical lathe according to the present utility model.Fig. 3 is referred to, numerical control vertical lathe includes Fig. 1 With 2 shown in clamping device 10 and controller 20.The main shaft connecting plate of clamping device 10 and the machine tool chief axis of numerical control vertical lathe connect It connects, digital control signal is issued to clamping device 10 by controller 20, such as PLC controller, is carried out with the operation to clamping device Accurate control.

The utility model relates to clamping devices and numerical control vertical lathe.Clamping device is for fixing workpiece to be processed, comprising: certain Bit location, workpiece to be processed are sleeved on positioning unit；One driving unit is coaxially disposed with positioning unit and runs through positioning list Member, wherein driving unit can move back and forth on the axial direction of positioning unit, to squeeze positioning unit, and cause to position The diameter of unit changes, in the increased situation of diameter of positioning unit, positioning unit tensioner in the inner cavity of workpiece to be processed. The utility model is solved and can not be difficult to completely to the run-out tolerance of workpiece to be processed accurate positioning, processing finished product in process The technical issues of sufficient related request, and clamping device itself is simple and convenient, has saved the lifting workpiece time, has improved work Make efficiency and reduces the labor intensity of personnel.

It is obtained through overtesting: after high precision lathe spindle connecting plate is connect with machine tool chief axis, the substrate of clamping device Plane bounce and the circular runout of conical core shaft mounting hole can reach 0.008~0.015mm.Conical core shaft passes through simple school Standard, bounce can reach within 0.01mm, and after installing expansion set in conical core shaft, expansion set bounce can be less than 0.015mm.Fixed ring Plane bounce can be less than 0.015mm.

The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, for this field Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (10)

1. clamping device, the clamping device (10) is for fixing workpiece to be processed, which is characterized in that the clamping device (10) Include:

Locating unit (100), the workpiece to be processed are sleeved on the positioning unit (100)；

One driving unit (200) is coaxially disposed with the positioning unit (100) and runs through the positioning unit (100),

Wherein, the driving unit (200) can move back and forth on the axial direction of the positioning unit (100), to squeeze The positioning unit (100), and the diameter of the positioning unit (100) is caused to change, the diameter in the positioning unit (100) In increased situation, positioning unit (100) tensioner in the inner cavity of the workpiece to be processed.

2. clamping device according to claim 1, which is characterized in that the clamping device (10) further includes an abjection unit (300), the driving unit (200) in the reciprocating motion by the abjection unit (300) towards the positioning unit (100) it squeezes, and the diameter of the positioning unit (100) is caused to reduce, the positioning unit (100) is received in the inner cavity Contracting.

3. clamping device according to claim 2, which is characterized in that the driving unit (200) includes:

One pull rod (210) is formed in one end of the pull rod (210) and compresses disk (211)；

One connecting rod (220) is formed with backstop disk (221) in one end of the connecting rod (220),

Wherein, the positioning unit (100) compresses between disk (211) and the backstop disk (221) positioned at described, the pull rod (210) it is fixedly connected axially through the positioning unit (100) and with the connecting rod (220).

4. clamping device according to claim 3, which is characterized in that the positioning unit (100) includes:

One expansion set (110)；

One hollow conical core shaft (120), the mandrel base portion (122) with cone (121) and the carrying cone (121),

Wherein, the expansion set (110) is axially sleeved on the cone (121).

5. clamping device according to claim 4, which is characterized in that the abjection unit (300) includes:

One ejection ring (310)；

At least one knock pin (320) extends through the mandrel base portion (122) and is clamped in the ejection ring (310) and institute It states between backstop disk (221),

Wherein, the ejection ring (310) is axially sleeved on the cone (121) and is located at the expansion set (110) and described Between mandrel base portion (122).

6. clamping device according to claim 5, which is characterized in that

It is described compress disk (211) and the expansion set (110) not in contact in the case where, the expansion set (110) and the ejection ring (310) it is separated from each other in the axial direction；

It is described compress disk (211) while contacting the expansion set (110) and the conical core shaft (120) when, the expansion set (110) Diameter be maximum value.

7. clamping device according to claim 5 or 6, which is characterized in that the positioning unit (100) is in the taper core The axial rearward direction of axis (120) further include:

One substrate (130) carries the mandrel base portion (122), and the substrate (130) is with a center through hole (131) and at least One eccentric through-hole (132)；

One main shaft connecting plate (140), carries the substrate (130), and the main shaft connecting plate (140) has around the backstop disk (221) pilot hole (141).

8. clamping device according to claim 7, which is characterized in that the positioning unit (100) further include:

One protection ring (150) is supported on the mandrel base portion (122), radially around the expansion set (110) and the ejection Ring (310),

The protection ring (150) has the annular flange (151) radially-inwardly stretched out in the side away from the substrate (130), The area of a circle that the annular flange (151) limits is greater than the cross section of the inner cavity.

9. clamping device according to any one of claim 1 to 6, which is characterized in that the driving unit (200) is liquid Press driving unit.

10. numerical control vertical lathe characterized by comprising

Clamping device (10) according to any one of claim 1 to 9, wherein the main shaft of the clamping device (10) connects Plate (140) is connect with the machine tool chief axis of the numerical control vertical lathe；

Controller (20) issues digital control signal to the clamping device (10).