CN220974764U - Bag moving mechanism - Google Patents

Bag moving mechanism Download PDF

Info

Publication number
CN220974764U
CN220974764U CN202323169081.1U CN202323169081U CN220974764U CN 220974764 U CN220974764 U CN 220974764U CN 202323169081 U CN202323169081 U CN 202323169081U CN 220974764 U CN220974764 U CN 220974764U
Authority
CN
China
Prior art keywords
bag
clamping
tracking
rod
swing
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.)
Active
Application number
CN202323169081.1U
Other languages
Chinese (zh)
Inventor
李华章
崔龙云
杨理墩
祝斌斌
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.)
Wuhu Yudong Automation Technology Co ltd
Original Assignee
Wuhu Yudong Automation Technology 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
Application filed by Wuhu Yudong Automation Technology Co ltd filed Critical Wuhu Yudong Automation Technology Co ltd
Priority to CN202323169081.1U priority Critical patent/CN220974764U/en
Application granted granted Critical
Publication of CN220974764U publication Critical patent/CN220974764U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Supplying Of Containers To The Packaging Station (AREA)

Abstract

The utility model discloses a bag moving mechanism, which comprises: the tracking swing arm is arranged on the upright post of the packaging machine; the bag feeding vertical frame is arranged on the tracking swing arm in a swinging way, and a bag feeding driving mechanism for driving the bag feeding vertical frame to swing is also arranged; the clamping mechanism is arranged on the bag feeding vertical frame, a first clamping mechanism and a second clamping mechanism are arranged on the clamping mechanism, and the first clamping mechanism and the second clamping mechanism can respectively clamp a bag body, so that the mode of single-station single-bag packaging of the traditional vacuum packaging machine is changed, bag moving of single-station double-bag is realized, and the production speed of single equipment is greatly accelerated. Meanwhile, the bag moving machine can rotate along with the bag moving process, so that the vacuum chamber can move the bag without stopping the machine.

Description

Bag moving mechanism
Technical Field
The utility model belongs to the technical field of vacuum packaging machines, and particularly relates to a bag moving mechanism.
Background
In carrying out the utility model, the inventors have found that the prior art has at least the following problems:
The traditional vacuum packaging machine adopts a single-station single-bag packaging mode, and the bag moving mechanism correspondingly adopts a single-station structure, so that the working efficiency is low.
CN 204341474U-vacuum packaging machine moves a bag mechanism, disclosed a vacuum packaging machine moves a bag mechanism, including the base, the revolving cylinder, the swing arm, flexible cylinder, the pivot, the activity machine presss from both sides, fixed machine presss from both sides and the crossbeam board, base fixed mounting, revolving cylinder fixed connection is in one side of base, revolving head and the lower extreme fixed connection of swing arm of revolving cylinder, the upper end and the crossbeam board fixed connection of swing arm, the axle both ends of pivot are by crossbeam board slewing bearing, the axle head of pivot is equipped with the link plate, and be connected with the piston rod of flexible cylinder through the link plate, also unable solution above-mentioned technical problem.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a bag moving mechanism, which changes the single-station single-bag packaging mode of the traditional vacuum packaging machine, realizes single-station double-bag moving and greatly accelerates the production speed of single equipment.
In order to solve the technical problems, the utility model adopts the following technical scheme: a bag transfer mechanism, comprising:
the tracking swing arm is arranged on the upright post of the packaging machine;
The bag feeding vertical frame is arranged on the tracking swing arm in a swinging way, and a bag feeding driving mechanism for driving the bag feeding vertical frame to swing is also arranged;
The clamping mechanism is arranged on the bag feeding vertical frame, a first clamping mechanism and a second clamping mechanism are arranged on the clamping mechanism, and the first clamping mechanism and the second clamping mechanism can respectively clamp a bag body.
The clamping mechanism is provided with a bag clamping swing rod seat which is arranged on the tracking swing arm; the bag clamping swing rod seat is fixedly provided with a fixed clamping plate.
The first clamping mechanism is provided with a first bag clamping rod, the first bag clamping rod is rotatably installed in the bag clamping swing rod seat, a first movable clamping plate which can be matched with the fixed clamping plate is fixedly arranged on the first bag clamping rod, and a first power mechanism for driving the first bag clamping rod to rotate is further arranged on the bag clamping swing rod seat.
The second clamping mechanism is provided with a second bag clamping rod, the second bag clamping rod is rotatably arranged in the first bag clamping rod, the first end of the second bag clamping rod extends out of the second bag clamping rod, and the first end of the second bag clamping rod extends and is fixedly provided with a second movable clamping plate which can be matched with the fixed clamping plate; the second power mechanism is used for driving the second bag clamping rod to rotate.
The first power mechanism comprises a bag clamping rocker arm and a first bag clamping cylinder, the first bag clamping cylinder is hinged to the tracking swing arm, a piston rod of the first bag clamping cylinder is hinged to a first end of the bag clamping rocker arm, and a second end of the bag clamping rocker arm is fixed to the first bag clamping rod.
The second power mechanism is a rotating motor, the rotating motor is arranged on the bag clamping swing rod seat, and a rotating shaft of the rotating motor is connected with the second end of the second bag clamping rod.
The bag feeding driving mechanism comprises:
The first end of the bag conveying secondary pull rod is hinged with the bag conveying vertical frame;
the bag feeding rotating shaft is rotatably arranged on a frame of the packaging machine;
the first end of the bag conveying swing rod is hinged with the second end of the bag conveying secondary pull rod, and the second end of the bag conveying swing rod is fixedly connected with the first end of the bag conveying rotating shaft;
The first end of the bag conveying push-pull arm is fixedly connected with the second end of the bag conveying rotating shaft;
the first end of the bag feeding main pull rod is hinged with the second end of the bag feeding push-pull arm;
The bag conveying swing arm is hinged to the frame near the middle of the bag conveying swing arm, and the first end of the bag conveying swing arm is hinged to the second end of the bag conveying main pull rod;
The bag feeding cam is rotatably arranged on the frame, and the second end of the bag feeding swing arm is matched with the bag feeding cam.
The tracking swing arm is rotatably arranged on the upright post of the packaging machine, and a tracking swing arm driving mechanism for driving the tracking swing arm to swing is further arranged.
The tracking swing arm driving mechanism has:
The first end of the tracking secondary pull rod is hinged with the tracking swing arm;
the bag feeding rotating shaft is rotatably arranged on a frame of the packaging machine;
The first end of the tracking swing rod is hinged with the second end of the tracking secondary pull rod, and the second end of the tracking swing rod is fixedly connected with the first end of the bag feeding rotating shaft;
The first end of the tracking push-pull arm is fixedly connected with the second end of the bag feeding rotating shaft;
The first end of the tracking main pull rod is hinged with the second end of the tracking push-pull arm;
the middle part of the tracking swing block is hinged to the frame, and the first end of the tracking swing block is hinged to the second end of the tracking main pull rod;
and the tracking cam is rotatably arranged on the frame, and the second end of the tracking swing block is matched with the tracking cam.
The bag feeding cam and the tracking cam are respectively arranged at two sides of a disc.
The technical scheme has the following advantages or beneficial effects that the single-station single-bag packaging mode of the traditional vacuum packaging machine is changed, single-station double-bag moving is realized, and the production speed of single equipment is greatly increased. Meanwhile, the bag moving machine can rotate along with the bag moving process, so that the vacuum chamber can move the bag without stopping the machine.
Drawings
Fig. 1 is a schematic structural view of a bag moving mechanism provided in an embodiment of the present utility model;
FIG. 2 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 3 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 4 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 5 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 6 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 7 is a schematic view of the bag moving mechanism of FIG. 1;
FIG. 8 is a schematic view of the bag moving mechanism of FIG. 1;
the labels in the above figures are: 701. tracking the swing arm, 702, the bag feeding stand,
703. The tracking driving mechanism 7031, a tracking secondary pull rod, a tracking swing rod, a 7033, a tracking rotating shaft, a 7034, a tracking push-pull arm, a 7035, a tracking main pull rod, a 7036, a tracking swing block, a 7037 and a tracking cam;
704. The bag feeding driving mechanism 7041, a bag feeding secondary pull rod, 7042, a bag feeding swing rod, 7043, a bag feeding rotating shaft, 7044, a bag feeding push-pull arm, 7045, a bag feeding main pull rod, 7046, a bag feeding swing arm, 7047 and a bag feeding cam;
705. A clamping mechanism; 7051. the bag clamping swing rod seat 7052, a fixed clamping plate, 7053, a first bag clamping rod, 7054, a bag clamping swing arm, 7055, a first bag clamping cylinder, 7056, a first movable clamping plate, 7057, a second bag clamping rod, 7058, a rotating motor, 7059 and a second movable clamping plate;
706. And (5) pressing a bag plate.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 8, a bag moving mechanism includes: a tracking swing arm 701 mounted on the upright of the packaging machine; a bag feeding stand 702 which is arranged on the tracking swing arm 701 in a swinging way, and is also provided with a bag feeding driving mechanism 704 for driving the bag feeding stand 702 to swing; the bag feeding driving mechanism 704 swings the bag feeding stand 702, and feeds the bag body from the turntable to the vacuum chamber to vacuum. The clamping mechanism is arranged on the bag feeding vertical frame 702, and is provided with a first clamping mechanism and a second clamping mechanism which can respectively clamp a bag body. The bag body is clamped by the first clamping mechanism and the second clamping mechanism respectively, so that the single-station single-bag packaging mode of the traditional vacuum packaging machine is changed, bag moving of single-station double-bag is realized, and the production speed of single equipment is greatly increased.
The clamping mechanism is provided with a bag clamping swing rod seat 7051, and the bag clamping swing rod seat 7051 is arranged on the tracking swing arm 701; a fixed clamping plate 7052 is fixedly arranged on the bag clamping swing rod seat 7051. The fixed clamping plate 7052 serves as a common fixed end of the first clamping mechanism and the second clamping mechanism, and a movable end is arranged on the first clamping mechanism and the second clamping mechanism in a distributed mode and is matched with the fixed clamping plate 7052 to clamp the bag body.
The first clamping mechanism is provided with a first bag clamping rod 7053, the first bag clamping rod 7053 is rotatably arranged in a bag clamping swing rod seat 7051, a first movable clamping plate 7056 which can be matched with a fixed clamping plate 7052 is fixedly arranged on the first bag clamping rod 7053, and a first power mechanism for driving the first bag clamping rod 7053 to rotate is further arranged on the bag clamping swing rod seat 7051. The first movable clamp plate 7056 is driven to move by the rotation of the first bag clamping rod 7053, and the first movable clamp plate 7056 is matched with the fixed clamp plate 7052 to clamp the bag body.
The second clamping mechanism is provided with a second bag clamping rod 7057, the second bag clamping rod 7057 is rotatably arranged in the first bag clamping rod 7053, a first end of the second bag clamping rod 7057 extends out of the second bag clamping rod 7057, and a second movable clamping plate 7059 which can be matched with the fixed clamping plate 7052 is fixedly arranged on the first end of the second bag clamping rod 7057 in an extending mode; a second power mechanism is also included to drive rotation of second bag holder 7057. The second movable clamping plate 7059 is driven to move by the rotation of the second bag clamping rod 7057, and the second movable clamping plate 7059 is matched with the fixed clamping plate 7052 to clamp the bag body.
The first power mechanism comprises a bag clamping rocker 7054 and a first bag clamping cylinder 7055, the first bag clamping cylinder 7055 is hinged to the tracking swing arm 701, a piston rod of the first bag clamping cylinder 7055 is hinged to a first end of the bag clamping rocker 7054, and a second end of the bag clamping rocker 7054 is fixed to the first bag clamping rod 7053. The first bag clamping cylinder 7055 drives the bag clamping rocker 7054 to swing to drive the first bag clamping rod 7053 to rotate, so that the first movable clamping plate 7056 is driven to move, and the first movable clamping plate 7056 is matched with the fixed clamping plate 7052 to clamp the bag body.
The second power mechanism is a rotating motor 7058, the rotating motor 7058 is arranged on the bag clamping swing rod seat 7051, and a rotating shaft of the rotating motor 7058 is connected with a second end of the second bag clamping rod 7057. The second bag clamping rod 7057 is driven to rotate by the rotating motor 7058, so that the second movable clamping plate 7059 is driven to move, and the second movable clamping plate 7059 is matched with the fixed clamping plate 7052 to clamp the bag body.
The bag feeding driving mechanism 704 includes: a bag feeding sub-pull rod 7041, a first end of which is hinged with a bag feeding vertical frame 702; a bag feeding rotating shaft 7043 rotatably installed on the frame of the packaging machine; the first end of the bag feeding swing rod 7042 is hinged with the second end of the bag feeding secondary pull rod 7041, and the second end is fixedly connected with the first end of the bag feeding rotating shaft 7043; the first end of the bag feeding push-pull arm 7044 is fixedly connected with the second end of the bag feeding rotating shaft 7043; a bag feeding main pull rod 7045, the first end of which is hinged with the second end of a bag feeding push-pull arm 7044; the bag feeding swing arm 7046 is hinged to the frame near the middle of the bag feeding swing arm 7046, and a first end of the bag feeding swing arm 7046 is hinged to a second end of the bag feeding main pull rod 7045; the pocket cam 7047 is rotatably mounted on the frame, and a second end of the pocket swing arm 7046 is adapted to the pocket cam 7047. The bag feeding cam 7047 drives the bag feeding link mechanism to move, so that the bag feeding stand 702 swings, and the bag body is fed into the vacuum chamber from the turntable to be vacuumized.
The tracking swing arm 701 is rotatably installed on the upright post of the packaging machine, and a tracking swing arm 701 driving mechanism for driving the tracking swing arm 701 to swing is also arranged. The tracking swing arm 701 driving mechanism can drive the tracking swing arm 701 to swing, so that the clamping mechanism is driven to rotate around the turntable of the vacuum chamber, the clamping mechanism is enabled to rotate along with the turntable of the vacuum chamber, and when the bag body is sent into the vacuum chamber, the vacuum chamber does not need to be stopped, and the continuous rotation can be kept.
The tracking swing arm driving mechanism includes: a tracking secondary pull rod 7031, a first end of which is hinged with the tracking swing arm 701; a bag feeding rotating shaft 7043 rotatably installed on the frame of the packaging machine; the first end of the tracking swing rod 7032 is hinged with the second end of the tracking secondary pull rod 7031, and the second end of the tracking swing rod 7032 is fixedly connected with the first end of the bag feeding rotating shaft 7043; a tracking push-pull arm 7034, the first end of which is fixedly connected with the second end of the bag feeding rotating shaft 7043; a tracking master lever 7035 having a first end hinged to a second end of the tracking push-pull arm 7034; a tracking swing block 7036, the vicinity of the middle of which is hinged on the frame, the first end of the tracking swing arm 701 is hinged with the second end of the tracking main pull rod 7035; a tracking cam 7037 rotatably mounted to the housing, a second end of the tracking rocker 7036 being adapted to the tracking cam 7037. The tracking link mechanism is driven by the tracking cam 7037 to drive the tracking swinging block 7036 to swing, so that the clamping mechanism is driven to rotate around the turntable of the vacuum chamber, the clamping mechanism is enabled to rotate along with the turntable of the vacuum chamber, and when the bag body is sent into the vacuum chamber, the vacuum chamber does not need to be stopped, and the continuous rotation can be kept.
The pocket feeding cam 7047 and the tracking cam 7037 are respectively arranged on two sides of a disc, so that the structure is more compact.
After adopting foretell structure, changed the mode of single station single bag packing of traditional vacuum packaging machine, realized the bag that moves of single station double cassette, the production speed of single equipment is accelerated by a wide margin. Meanwhile, the bag moving machine can rotate along with the bag moving process, so that the vacuum chamber can move the bag without stopping the machine.
In the description of the present utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A bag moving mechanism, characterized by comprising:
the tracking swing arm is arranged on the upright post of the packaging machine;
The bag feeding vertical frame is arranged on the tracking swing arm in a swinging way, and a bag feeding driving mechanism for driving the bag feeding vertical frame to swing is also arranged;
The clamping mechanism is arranged on the bag feeding vertical frame, a first clamping mechanism and a second clamping mechanism are arranged on the clamping mechanism, and the first clamping mechanism and the second clamping mechanism can respectively clamp a bag body.
2. The bag moving mechanism according to claim 1, wherein the clamping mechanism is provided with a bag clamping swing rod seat, and the bag clamping swing rod seat is arranged on the tracking swing arm; the bag clamping swing rod seat is fixedly provided with a fixed clamping plate.
3. The bag moving mechanism as claimed in claim 2, wherein the first clamping mechanism is provided with a first bag clamping rod, the first bag clamping rod is rotatably installed in the bag clamping swing rod seat, a first movable clamping plate which can be matched with the fixed clamping plate is fixedly arranged on the first bag clamping rod, and a first power mechanism for driving the first bag clamping rod to rotate is further arranged on the bag clamping swing rod seat.
4. The bag moving mechanism as claimed in claim 3, wherein the second clamping mechanism is provided with a second bag clamping rod, the second bag clamping rod is rotatably arranged in the first bag clamping rod, the first end of the second bag clamping rod extends out of the second bag clamping rod, and a second movable clamping plate which can be matched with the fixed clamping plate is fixedly arranged on the first end of the second bag clamping rod; the second power mechanism is used for driving the second bag clamping rod to rotate.
5. The bag moving mechanism of claim 4, wherein the first power mechanism comprises a bag clamping rocker arm and a first bag clamping cylinder, the first bag clamping cylinder is hinged on the tracking rocker arm, a piston rod of the first bag clamping cylinder is hinged with a first end of the bag clamping rocker arm, and a second end of the bag clamping rocker arm is fixed on the first bag clamping rod.
6. The bag moving mechanism of claim 5, wherein the second power mechanism is a rotating motor, the rotating motor is mounted on the bag clamping swing rod seat, and a rotating shaft of the rotating motor is connected with the second end of the second bag clamping rod.
7. The bag moving mechanism as claimed in claim 6, wherein said bag feeding driving mechanism has:
The first end of the bag conveying secondary pull rod is hinged with the bag conveying vertical frame;
the bag feeding rotating shaft is rotatably arranged on a frame of the packaging machine;
the first end of the bag conveying swing rod is hinged with the second end of the bag conveying secondary pull rod, and the second end of the bag conveying swing rod is fixedly connected with the first end of the bag conveying rotating shaft;
The first end of the bag conveying push-pull arm is fixedly connected with the second end of the bag conveying rotating shaft;
the first end of the bag feeding main pull rod is hinged with the second end of the bag feeding push-pull arm;
The bag conveying swing arm is hinged to the frame near the middle of the bag conveying swing arm, and the first end of the bag conveying swing arm is hinged to the second end of the bag conveying main pull rod;
The bag feeding cam is rotatably arranged on the frame, and the second end of the bag feeding swing arm is matched with the bag feeding cam.
8. The bag moving mechanism as claimed in claim 7, wherein the tracking swing arm is rotatably mounted on a stand of the packaging machine, and a tracking swing arm driving mechanism for driving the tracking swing arm to swing is further provided.
9. The bag moving mechanism of claim 8, wherein the tracking swing arm drive mechanism has:
The first end of the tracking secondary pull rod is hinged with the tracking swing arm;
the bag feeding rotating shaft is rotatably arranged on a frame of the packaging machine;
The first end of the tracking swing rod is hinged with the second end of the tracking secondary pull rod, and the second end of the tracking swing rod is fixedly connected with the first end of the bag feeding rotating shaft;
The first end of the tracking push-pull arm is fixedly connected with the second end of the bag feeding rotating shaft;
The first end of the tracking main pull rod is hinged with the second end of the tracking push-pull arm;
the middle part of the tracking swing block is hinged to the frame, and the first end of the tracking swing block is hinged to the second end of the tracking main pull rod;
and the tracking cam is rotatably arranged on the frame, and the second end of the tracking swing block is matched with the tracking cam.
10. The bag moving mechanism as claimed in claim 9, wherein said bag feeding cam and said tracking cam are provided on both sides of a disc, respectively.
CN202323169081.1U 2023-11-23 2023-11-23 Bag moving mechanism Active CN220974764U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202323169081.1U CN220974764U (en) 2023-11-23 2023-11-23 Bag moving mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202323169081.1U CN220974764U (en) 2023-11-23 2023-11-23 Bag moving mechanism

Publications (1)

Publication Number Publication Date
CN220974764U true CN220974764U (en) 2024-05-17

Family

ID=91035366

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202323169081.1U Active CN220974764U (en) 2023-11-23 2023-11-23 Bag moving mechanism

Country Status (1)

Country Link
CN (1) CN220974764U (en)

Similar Documents

Publication Publication Date Title
CN220974764U (en) Bag moving mechanism
CN204771268U (en) Automatic fixed -position welding system of box
CN117446277A (en) Bag moving mechanism
CN210213925U (en) Rotating mechanism for assembling battery module and regular rotating mechanism
CN115339702B (en) Double-layer bag clamping device
CN212073098U (en) Cam-type paper feeding device
CN220974756U (en) Opening and clamping mechanism of packaging machine
CN216402051U (en) Labeling module for labeling machine
CN221024530U (en) Main machine turntable mechanism
CN220517692U (en) Turning mechanism of paper bag machine
CN219096103U (en) Bag opening device
CN220841687U (en) Splayed glue spraying mechanism of paper bag machine
CN215203725U (en) Double-servo swing arm traction trolley
CN218113175U (en) Bag moving driving mechanism
CN219468264U (en) Label cutting machine for blade type hot melt adhesive labeling machine
CN220282760U (en) Swing arm machine for logistics sorting
CN220595348U (en) Bag taking device of bag feeding packaging machine and bag feeding packaging machine
CN215478384U (en) Transverse stacking device for brick production
CN218050044U (en) Bender feed mechanism is used in processing of switch board casing
CN219771080U (en) Flexible carrier tilting mechanism
CN215514342U (en) Cam-driven suction mechanism of full-automatic mask lining boxing machine
CN216154142U (en) Box turning and moving device for packing box
CN220836314U (en) Optical lens inking mechanism
CN214690475U (en) Bag clamping device for packaging machine
CN217100841U (en) Multi-angle labeling mechanism

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant