CN201997617U - Rotary extrusion sealing device of sealing machine of pipe fitting - Google Patents

Rotary extrusion sealing device of sealing machine of pipe fitting Download PDF

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Publication number
CN201997617U
CN201997617U CN2010206646880U CN201020664688U CN201997617U CN 201997617 U CN201997617 U CN 201997617U CN 2010206646880 U CN2010206646880 U CN 2010206646880U CN 201020664688 U CN201020664688 U CN 201020664688U CN 201997617 U CN201997617 U CN 201997617U
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CN
China
Prior art keywords
main shaft
cutter
sealing
connecting rod
center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2010206646880U
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Chinese (zh)
Inventor
龙晓斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongshan Oms Industrial Co Ltd
Original Assignee
Zhongshan Oms Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN2010206646880U priority Critical patent/CN201997617U/en
Application granted granted Critical
Publication of CN201997617U publication Critical patent/CN201997617U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a rotary extrusion sealing device of a sealing machine of a pipe fitting, which is characterized by comprising a main shaft, a cutterhead arranged at the front end of the main shaft, a sealing knife arranged on the cutterhead, a guide mechanism of the sealing knife and a knife shifting mechanism, wherein the main shaft is driven to rotate by a driving mechanism of the main shaft, the sealing knife slips along a direction vertical to the axis of the main shaft under the guide of the guide mechanism of the sealing knife and is also close to or far away from the axis of the main shaft, and the knife shifting mechanism drives the sealing knife to slip along the guide mechanism of the sealing knife. The rotary extrusion sealing device of the sealing machine of the pipe fitting has the following advantages that: (1) the driving mechanism of the main shaft impels the main shaft to drive the cutterhead to rotate, so that the sealing knife rotates around the circumferential direction of the main shaft; meanwhile, the knife shifting mechanism drives the sealing knife to slip along the guide mechanism of the sealing knife, so that the sealing knife slips along the direction vertical to the axis of the main shaft and is also close to or far away from the axis of the main shaft; therefore, the processing of the rotary extrusion sealing of the open end of a pipe fitting to be processed can be realized, and finally, a sealing wall vertical to the side wall of the pipe fitting to be processed is formed; and moreover, the thickness of the sealing wall is uniform, and the sealing effect is good; and (2) the entire rotary extrusion sealing device has a simple and compact structure and is convenient to control.

Description

A kind of pipe fitting sealing machine revolve squeeze seal mouth device
Technical field
What the utility model related to a kind of pipe fitting sealing machine revolves squeeze seal mouth device.
Background technology
The closing device of existing sealing machine, comprise that mainly main shaft and inclination be located at the cutter of front-end of spindle, cutter can only be along the main shaft axial feed, can not rotate in a circumferential direction and move simultaneously around main shaft along direction perpendicular to main shaft, so when the metal tube end is sealed, be difficult to form with the metal tube sidewall perpendicular seal wall, and also there is the defective of became uneven in the thickness that seals wall, sealing effect is poor, influences the service life of metal tube.
Summary of the invention
At the deficiency that prior art exists, what the utility model provided a kind of sealing machine revolves squeeze seal mouth device, and it seals cutter and can rotate in a circumferential direction and move along the direction perpendicular to main shaft simultaneously around main shaft.
The technical solution of the utility model is achieved in that
A kind of pipe fitting sealing machine revolve squeeze seal mouth device, it is characterized in that: comprise main shaft, be located at front-end of spindle cutterhead, be located at sealing cutter, seal the cutter guiding mechanism and moving cutter mechanism on the cutterhead, main shaft orders about rotation by main shaft drives mechanism, seal cutter in the guiding lower edge of sealing the cutter guiding mechanism perpendicular to the direction slippage of main-shaft axis near or away from main-shaft axis, move cutter mechanism and drive and to seal cutter along sealing the slippage of cutter guiding mechanism.
The utlity model has following advantage: 1, main shaft drives mechanism orders about main shaft and drives the cutterhead rotation, makes to seal cutter and rotate in a circumferential direction around main shaft; Simultaneously, move the cutter mechanism drive and seal cutter along sealing the slippage of cutter guiding mechanism, make seal cutter along perpendicular to the direction slippage of main-shaft axis near or away from main-shaft axis, thereby the openend for the treatment of the processing pipe fitting can realize revolving the processing of squeeze seal mouth, final form with pipe fitting sidewall to be processed perpendicular seal wall, and seal the wall thickness unanimity, sealing effect is good.2, the whole simply compactness of squeeze seal mouth apparatus structure of revolving, control is convenient.
The described cutter guiding mechanism that seals comprises guide groove, draw runner and tool rest on the cutterhead, guide groove is arranged with in the cutterhead end face, tool rest is located in the guide groove, draw runner is fixed on the madial wall of guide groove and embeds the tool rest sidewall, draw runner is vertical with main-shaft axis, tool rest seals cutter and is installed in the tool rest front surface along draw runner and guide groove slippage.Simple in structure, sealing cutter can move freely under the guiding of sealing the cutter guiding mechanism.
The above-mentioned cutter mechanism that moves comprises first connecting rod, shift fork, second connecting rod, sliding sleeve, center-pole and center-pole actuator, shift fork is formed by connecting and is by preceding group of arm and back group arm and colludes shape, shift fork is hubbed on the cutterhead by a jointed shaft, dial arm before this jointed shaft is positioned at and dial the arm junction with the back, the elongated end of preceding group arm and an end of first connecting rod are hinged, the other end and the tool rest of first connecting rod are hinged, the elongated end of back group arm and an end of second connecting rod are hinged, the other end and the sliding sleeve of second connecting rod are hinged, sliding sleeve, center-pole and center-pole actuator and main shaft coaxial line, but sliding sleeve axial slip ground inserts the middle vacancy of main shaft, but pass the middle vacancy of main shaft the center-pole axial slip, center-pole front end and sliding sleeve are fixed, the rear end of center-pole is exposed from main shaft and is connected with the center-pole actuator, and the center-pole actuator can drive center-pole along main axle moving.Simple in structure, can conveniently control and seal cutter and move by moving cutter mechanism.
Be provided with two tool rests in the described guide groove, be fixed with one respectively on two tool rests and seal cutter; The described cutter mechanism that moves comprises two first connecting rods, two shift forks, two second connecting rods, each tool rest connects transmission by a first connecting rod, a shift fork and a second connecting rod with sliding sleeve respectively, first group of tool rest, first connecting rod, shift fork, second connecting rod and second group of tool rest, first connecting rod, shift fork, second connecting rod symmetric arrangement.Simple in structure, rationally distributed, and seal cutter when being symmetrical arranged, can guarantee to seal the end stress equalization of cutter pipe fitting to be processed when alignment of shafts slippage, be beneficial to and form vertical and thickness is consistent seals wall with sidewall, pipe fitting end sealing effect to be processed is good.
Described main shaft is hubbed on the sealing machine frame and axial location, and described main shaft drives mechanism connects with rear-end of spindle.Simple in structure, rationally distributed.
Described main shaft drives mechanism comprises motor and tape handler, and motor is fixed in the sealing machine frame, and the driving wheel of tape handler is fixed on the axle of motor, and the driven pulley of tape handler is fixed on rear-end of spindle.Simple in structure, control is convenient.
Description of drawings
Fig. 1 is the structural representation that revolves squeeze seal mouth device of the utility model;
Fig. 2 is the C-C structure cutaway view of Fig. 1.
Fig. 3 be the utility model cutterhead, seal cutter and move the assembly structure figure of cutter mechanism.
Fig. 4 is a stereogram of using the sealing machine that revolves squeeze seal mouth device of the utility model;
Fig. 5 is the front view of sealing machine;
Fig. 6 is the A-A cutaway view of Fig. 4;
Fig. 7 is the B-B cutaway view of Fig. 5;
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1 to Figure 3, a kind of pipe fitting sealing machine revolve squeeze seal mouth device, comprise be hubbed on the sealing machine frame 1 and the main shaft 2 of axial location, be located at main shaft 2 front ends cutterhead 5, be located at sealing cutter 51, seal the cutter guiding mechanism and moving cutter mechanism on the cutterhead 5, main shaft 2 orders about rotation by main shaft drives mechanism, seal cutter 51 in the guiding lower edge of sealing the cutter guiding mechanism perpendicular to the direction slippage of main shaft 2 axis near or away from main-shaft axis, move cutter mechanism and drive and to seal cutter 51 along sealing the slippage of cutter guiding mechanism.The described cutter guiding mechanism that seals comprises guide groove 50 on the cutterhead 5, two draw runners 52 and two symmetrically arranged tool rests 53 up and down, guide groove 50 is arranged with in cutterhead 5 end faces, tool rest 53 is located in the guide groove 50, draw runner 52 is separately fixed on the madial wall up and down of guide groove 50 and embeds two tool rests, 53 sidewalls respectively up and down, draw runner 52 and main shaft 2 axis normal, tool rest 53 is along draw runner 52 and guide groove 50 slippages, and the front surface of two tool rests 53 is installed with one respectively and seals cutter 51.
Describedly move the first connecting rod 541 that cutter mechanism 54 comprises two symmetric arrangement, the shift fork 542 of two symmetric arrangement, the second connecting rod 543 of two symmetric arrangement, sliding sleeve 544, center-pole 545 and center-pole actuator, shift fork 542 is formed by connecting and is by preceding group of arm and back group arm and colludes shape, shift fork 542 is hubbed on the cutterhead 5 by a jointed shaft, dial arm before this jointed shaft is positioned at and dial the arm junction with the back, the elongated end of preceding group arm and an end of first connecting rod 541 are hinged, the other end of first connecting rod 541 and tool rest 53 are hinged, the elongated end of back group arm and an end of second connecting rod 543 are hinged, the other end of second connecting rod 543 and sliding sleeve 544 are hinged, make each tool rest 53 respectively by a first connecting rod 541, one shift fork 542 and a second connecting rod 543 connect transmission with sliding sleeve 544; Sliding sleeve 544, center-pole 545 and move cutter shaft 546 and main shaft 2 coaxial lines, but sliding sleeve 544 axial slip ground insert the middle vacancy of main shaft 2, but pass the middle vacancy of main shaft 2 center-pole 545 axial slips, center-pole 545 front ends and sliding sleeve 544 are fixing, and sliding sleeve 544 can rotate relative to center-pole 545, the rear end of center-pole 545 is exposed from main shaft 2 and is connected with the center-pole actuator, and the center-pole actuator can drive center-pole 545 and move along main shaft 2.
Described main shaft drives mechanism 3 connects with main shaft 2 rear ends, main shaft drives mechanism 3 comprises motor 31 and tape handler, motor 31 is fixed in the frame 1, and the driving wheel 32 of tape handler is fixed on the axle of motor 31, and the driven pulley 33 of tape handler is fixed on main shaft 2 rear ends.
4 to shown in Figure 7 as shown in the figure, a kind ofly use the above-mentioned sealing machine that revolves squeeze seal mouth device, the clamping device 4 that comprises frame 1, controller (not shown), main shaft 2, main shaft drives mechanism 3 and clamping workpiece to be processed, main shaft 2 is hubbed on the axle bed 14 of frame 1 and axial location, the mould of clamping device 4 and main shaft 2 be totally one axis and close main shaft 2 front ends, main shaft 2 front ends are fixed with cutterhead 5, and main shaft 2 rear ends connect main shaft drives mechanism 3, and main shaft drives mechanism 3 orders about main shaft 2 and rotates; Cutterhead 5 is provided with and seals cutter 51 and seal the cutter guiding mechanism, seal cutter 51 in the guiding lower edge of sealing the cutter guiding mechanism perpendicular to the direction slippage of main shaft 2 axis near or away from main shaft 2 axis, frame 1 or cutterhead 5 are provided with and move cutter mechanism 54, move cutter mechanism 54 drives and seal cutter 51 along sealing the slippage of cutter guiding mechanism; Move materials device between frame 1 and the clamping device 4, move materials device drive clamping device 4 make along main shaft 2 axis slippages clamping device 4 near or away from cutterhead 5 end faces.
Above-mentioned main shaft drives mechanism 3 comprises motor 31 and tape handler, and motor 31 is fixed in the frame 1, and the driving wheel 32 of tape handler is fixed on the axle of motor 31, and the driven pulley 33 of tape handler is fixed on main shaft 2 rear ends.
The above-mentioned cutter guiding mechanism that seals comprises guide groove 50 on the cutterhead 5, two draw runners 52 and two symmetrically arranged tool rests 53 up and down, guide groove 50 is arranged with in cutterhead 5 end faces, tool rest 53 is located in the guide groove 50, draw runner 52 is separately fixed on the madial wall up and down of guide groove 50 and embeds two tool rests, 53 sidewalls respectively up and down, draw runner 52 and main shaft 2 axis normal, tool rest 53 is along draw runner 52 and guide groove 50 slippages, and the front surface of two tool rests 53 is installed with one respectively and seals cutter 51.
Above-mentionedly move the first connecting rod 541 that cutter mechanism 54 comprises two symmetric arrangement, the shift fork 542 of two symmetric arrangement, the second connecting rod 543 of two symmetric arrangement, sliding sleeve 544, center-pole 545 and center-pole actuator, the center-pole actuator comprises and moves cutter shaft 546, move cutter slide plate 547, move the cutter guiding mechanism and move the cutter driving mechanism, shift fork 542 is formed by connecting and is by preceding group of arm and back group arm and colludes shape, shift fork 542 is hubbed on the cutterhead 5 by a jointed shaft, dial arm before this jointed shaft is positioned at and dial the arm junction with the back, the elongated end of preceding group arm and an end of first connecting rod 541 are hinged, the other end of first connecting rod 541 and tool rest 53 are hinged, the elongated end of back group arm and an end of second connecting rod 543 are hinged, the other end of second connecting rod 543 and sliding sleeve 544 are hinged, make each tool rest 53 respectively by a first connecting rod 541, one shift fork 542 and a second connecting rod 543 connect transmission with sliding sleeve 544; Sliding sleeve 544, center-pole 545 and move cutter shaft 546 and main shaft 2 coaxial lines, but sliding sleeve 544 axial slip ground insert the middle vacancy of main shaft 2, but pass the middle vacancy of main shaft 2 center-pole 545 axial slips, center-pole 545 front ends and sliding sleeve 544 are fixing, and sliding sleeve 544 can rotate relative to center-pole 545, the rear end of center-pole 545 is exposed from main shaft 2 and is fixed with the cutter shaft 546 that moves in the center-pole actuator, moves cutter shaft 546 and is hubbed on the bearing block 5472 that moves cutter slide plate 547 and axial location; The described cutter guiding mechanism that moves comprises and is arranged on moving cutter guide rail 12 and moving the slide 5471 that cutter slide plate 547 bottoms set firmly on the frame 1, move the cutter driving mechanism drive move cutter slide plate 547 by its slide 5471 move the 2 axis direction slippages of cutter guide rail 12 upper edge main shafts make move cutter slide plate 547 near or away from main shaft 2 rear ends, the described cutter driving mechanism that moves comprises the servomotor 71 that is controlled by the controller, decelerator 72, tape handler and ball guide screw nat, servomotor 71 and decelerator 72 are fixed in the frame 1, the axle of servomotor 71 connects with the power shaft of decelerator 72, the driving wheel 73 of tape handler is fixed on the output shaft of decelerator 72, the driven pulley 74 of tape handler is fixed on the leading screw 75 of ball guide screw nat, leading screw 75 is hubbed on the locating shaft bearing 11 of frame 1, and the nut of ball guide screw nat 76 is with to move cutter slide plate 547 fixing.
Above-mentioned move materials device comprise move the material slide plate 61, move the material guiding mechanism and move the material driving mechanism, above-mentioned clamping device 4 comprises the die shoe of being located in the framework 41, upper bolster 42 and one is located at outside the framework and is acted on the driving cylinder 43 of upper bolster, be respectively equipped with relative semicircle anchor clamps 421 and 411 removably on the upper bolster 42 upper and lower die holders 41, wherein, die shoe 41 is fixed on and moves on the material slide plate 61, be provided with a guide bar 44 between upper bolster 42 and the die shoe 41, upper bolster 42 can the effect lower edge guide bar 44 that drives cylinder 43 near or away from die shoe 41, thereby unclamp or clamp workpiece to be processed.For the workpiece to be processed of various outer diameter, only need to change corresponding anchor clamps 421 and 411, can the workpiece to be processed of various outer diameter be sealed.Move the material driving mechanism and drive and to move material slide plate 61 along moving the slippage of material guiding mechanism, thus drive clamping device 4 along main shaft 2 axis direction slippages and near or away from sealing cutter 53; The described material guiding mechanism that moves comprises the slide 63 of expecting that guide rail 62 and clamping device 4 bottoms set firmly that moves that is arranged on the frame 1, moves material slide plate 61 and is moving the 2 axis direction slippages of material guide rail 62 upper edge main shafts by slide 63; The described material driving mechanism that moves comprises servomotor 64, decelerator 65, tape handler and the ball guide screw nat that is controlled by the controller, servomotor 64 and decelerator 65 are fixed in the frame 1, the axle of servomotor 64 connects with the power shaft of decelerator 65, the driving wheel 66 of tape handler is fixed on the output shaft of decelerator 65, the driven pulley 67 of tape handler is fixed on the leading screw 68 of ball guide screw nat, leading screw 68 is hubbed on the bearing block 13 of frame 1, and the nut of ball guide screw nat 69 is with to move material slide plate 61 fixing.
The sealing machine of the utility model seals the method for processing to workpiece to be processed such as pipe fitting, comprises the steps:
A, provide a body with openend;
B, utilize clamping device clamping body;
C, provide a main shaft, main shaft one end is fixed with the cutterhead in the face of the body openend, and cutterhead is provided with and seals cutter, orders about main shaft by above-mentioned described main shaft drives mechanism and rotates, and seals the rotation of knife up speed thereby drive;
D, drive clamping device and make clamping device drive body to move and near sealing cutter along the main-shaft axis slippage along the main-shaft axis direction by the materials device that moves of being located at described clamping device below, simultaneously, utilize the above-mentioned described cutter mechanism that moves to drive and to seal cutter and seal the slippage of cutter guiding mechanism along being located at vertical with main shaft in the cutterhead, make and seal cutter along close spindle axis perpendicular to the direction slippage of main-shaft axis, make seal cutter from the outer rim of body openend to center extruding body openend, and repeat to push several times, form the shape of designing requirement until the body openend.
E, drive clamping device and make clamping device drive body along the main-shaft axis slippage, the pipe fitting after sealing is carried out the material returned handle, send into next process away from sealing cutter by the above-mentioned described materials device that moves.
Below only be that the specific embodiment in the utility model is illustrated, every equivalent transformation or modification of making according to the design concept in the utility model all should be thought to fall into protection domain of the present utility model.

Claims (6)

1. a pipe fitting sealing machine revolves squeeze seal mouth device, it is characterized in that: comprise main shaft, be located at front-end of spindle cutterhead, be located at sealing cutter, seal the cutter guiding mechanism and moving cutter mechanism on the cutterhead, main shaft orders about rotation by main shaft drives mechanism, seal cutter in the guiding lower edge of sealing the cutter guiding mechanism perpendicular to the direction slippage of main-shaft axis near or away from main-shaft axis, move cutter mechanism and drive and to seal cutter along sealing the slippage of cutter guiding mechanism.
2. a kind of pipe fitting sealing machine according to claim 1 revolve squeeze seal mouth device, it is characterized in that: the described cutter guiding mechanism that seals comprises guide groove, draw runner and tool rest on the cutterhead, guide groove is arranged with in the cutterhead end face, tool rest is located in the guide groove, draw runner is fixed on the madial wall of guide groove and embeds the tool rest sidewall, draw runner is vertical with main-shaft axis, and tool rest seals cutter and is installed in the tool rest front surface along draw runner and guide groove slippage.
3. a kind of pipe fitting sealing machine according to claim 1 and 2 revolve squeeze seal mouth device, it is characterized in that: the above-mentioned cutter mechanism that moves comprises first connecting rod, shift fork, second connecting rod, sliding sleeve, center-pole and center-pole actuator, shift fork is formed by connecting and is by preceding group of arm and back group arm and colludes shape, shift fork is hubbed on the cutterhead by a jointed shaft, dial arm before this jointed shaft is positioned at and dial the arm junction with the back, the elongated end of preceding group arm and an end of first connecting rod are hinged, the other end and the tool rest of first connecting rod are hinged, the elongated end of back group arm and an end of second connecting rod are hinged, the other end and the sliding sleeve of second connecting rod are hinged, sliding sleeve, center-pole and center-pole actuator and main shaft coaxial line, but sliding sleeve axial slip ground inserts the middle vacancy of main shaft, but pass the middle vacancy of main shaft the center-pole axial slip, center-pole front end and sliding sleeve are fixed, the rear end of center-pole is exposed from main shaft and is connected with the center-pole actuator, and the center-pole actuator can drive center-pole along main axle moving.
4. a kind of pipe fitting sealing machine according to claim 3 revolve squeeze seal mouth device, it is characterized in that: be provided with two tool rests in the described guide groove, be fixed with one respectively on two tool rests and seal cutter; The described cutter mechanism that moves comprises two first connecting rods, two shift forks, two second connecting rods, each tool rest connects transmission by a first connecting rod, a shift fork and a second connecting rod with sliding sleeve respectively, first group of tool rest, first connecting rod, shift fork, second connecting rod and second group of tool rest, first connecting rod, shift fork, second connecting rod symmetric arrangement.
5. a kind of pipe fitting sealing machine according to claim 4 revolve squeeze seal mouth device, it is characterized in that: described main shaft is hubbed on the sealing machine frame and axial location, described main shaft drives mechanism connects with rear-end of spindle.
6. a kind of pipe fitting sealing machine according to claim 5 revolve squeeze seal mouth device, it is characterized in that: described main shaft drives mechanism comprises motor and tape handler, motor is fixed in the sealing machine frame, the driving wheel of tape handler is fixed on the axle of motor, and the driven pulley of tape handler is fixed on rear-end of spindle.
CN2010206646880U 2010-12-09 2010-12-09 Rotary extrusion sealing device of sealing machine of pipe fitting Expired - Lifetime CN201997617U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010206646880U CN201997617U (en) 2010-12-09 2010-12-09 Rotary extrusion sealing device of sealing machine of pipe fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010206646880U CN201997617U (en) 2010-12-09 2010-12-09 Rotary extrusion sealing device of sealing machine of pipe fitting

Publications (1)

Publication Number Publication Date
CN201997617U true CN201997617U (en) 2011-10-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010206646880U Expired - Lifetime CN201997617U (en) 2010-12-09 2010-12-09 Rotary extrusion sealing device of sealing machine of pipe fitting

Country Status (1)

Country Link
CN (1) CN201997617U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166603A (en) * 2010-12-09 2011-08-31 中山市奥美森工业有限公司 Revolving-extrusion sealing device for pipe sealing machines
CN102430659A (en) * 2011-10-21 2012-05-02 中山市奥美森工业技术有限公司 Sealing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166603A (en) * 2010-12-09 2011-08-31 中山市奥美森工业有限公司 Revolving-extrusion sealing device for pipe sealing machines
CN102166603B (en) * 2010-12-09 2013-04-24 中山市奥美森工业有限公司 Revolving-extrusion sealing device for pipe sealing machines
CN102430659A (en) * 2011-10-21 2012-05-02 中山市奥美森工业技术有限公司 Sealing machine
WO2013056610A1 (en) * 2011-10-21 2013-04-25 中山市奥美森工业技术有限公司 Sealing machine

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GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20111005

Effective date of abandoning: 20130424

RGAV Abandon patent right to avoid regrant