CN217800241U - Disc chuck structure with rapidly replaced knife handle - Google Patents
Disc chuck structure with rapidly replaced knife handle Download PDFInfo
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- CN217800241U CN217800241U CN202221850911.XU CN202221850911U CN217800241U CN 217800241 U CN217800241 U CN 217800241U CN 202221850911 U CN202221850911 U CN 202221850911U CN 217800241 U CN217800241 U CN 217800241U
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- conical cutter
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Abstract
The utility model discloses a disc chuck structure of quick replacement handle of a knife, include: the clamping assembly, the conical cutter handle assembly and the cutter handle alignment piston mechanism are arranged in sequence; the clamping assembly comprises a chuck sleeve and a plurality of chuck positive claws; the chuck sleeve is provided with a plurality of sliding groove openings, and each chuck positive claw is arranged on one sliding groove opening and can slide in the sliding groove opening; the chuck sleeve is sleeved at the head of the conical cutter handle component; the conical cutter handle assembly comprises a conical cutter handle, a wire coiling, a plurality of bevel gears and a sealing mechanism arranged at the lower end of the conical cutter handle; the wire coiling is arranged at the top of the conical cutter handle; each bevel gear is arranged in one side part of the top of the conical cutter handle and is meshed with the wire coil; the knife handle alignment piston mechanism comprises a rotary table bearing, an air pressure pushing mechanism, a steel column clamping shaft and a knife handle alignment table; the air pressure pushing mechanism is arranged in the rotating table bearing.
Description
Technical Field
The utility model relates to a four-axis, five-axis machine tool machining, fast work piece technical field that more, in particular to disc chuck structure of quick replacement handle of a knife.
Background
In recent years, with the development of the scientific and technological industry, automation equipment has become more and more popular in the manufacturing industry, the precision requirement for precision part processing is higher and higher, no matter in the 3C industry, the industries of automobiles, batteries, semiconductors and the like have higher requirements for precision parts, and the actual matching precision is achieved for concentricity, circle center symmetry, processing efficiency and the like. However, in the existing industry, the bench vice is used for clamping the workpiece, multiple machining matching is needed, the part replacement is inconvenient, the efficiency is low, the precision is difficult to reach, deviation can occur in the replacement of each machined part, and the labor cost is relatively high. The existing workpiece clamping mode in the market is mostly customized according to products, is nonstandard, has low universality, can meet the requirements of customers on workpieces of the same type and different sizes, and then the customers need to buy corresponding customized clamps, so that the cost is high, and the manufacturing period is long.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a disc chuck structure of quick replacement handle of a knife.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
a disc chuck structure capable of rapidly replacing a tool shank comprises: the clamping assembly, the conical cutter handle assembly and the cutter handle alignment piston mechanism are arranged in sequence;
the clamping assembly comprises a chuck sleeve and a plurality of chuck positive claws; the chuck sleeve is provided with a plurality of sliding groove openings, and each chuck positive claw is arranged on one sliding groove opening and can slide in the sliding groove opening; the chuck sleeve is sleeved at the head of the conical cutter handle component;
the conical cutter handle assembly comprises a conical cutter handle, a wire coiling, a plurality of bevel gears and a sealing mechanism arranged at the lower end of the conical cutter handle; the wire coiling is arranged at the top of the conical cutter handle; each bevel gear is arranged in one side part of the top of the conical cutter handle and is meshed with the wire coil;
the knife handle alignment piston mechanism comprises a rotary table bearing, an air pressure pushing mechanism, a steel column clamping shaft and a knife handle alignment table; the air pressure pushing mechanism is arranged in the rotating table bearing; the steel column clamping shaft is arranged at the end part of the air pressure pushing mechanism; the tool holder aligning table is arranged at the top of the air pressure pushing mechanism.
Preferably, the disc chuck structure for rapidly replacing the tool holder further comprises a plurality of bevel gear positioning pins, two round thread through joints and a fixing block; each bevel gear positioning pin penetrates through the head of the conical cutter handle and is arranged beside a bevel gear; the two round thread straight-through joints are arranged at the side part of the bearing of the rotating table side by side; the fixed block is arranged at the bottom of the rotating table bearing.
Preferably, the number of the sliding groove openings is 3, and the sliding groove openings are positioned in three directions of the chuck sleeve and are communicated with each other; the number of the chuck positive claws is 3, and each chuck positive claw is arranged on a sliding groove opening.
Preferably, the number of the bevel gears is 3, the bevel gears are positioned at three positions on the top of the tapered tool shank, and each bevel gear is arranged below the position between the adjacent sliding groove openings.
Preferably, the sealing mechanism is provided as a sealing plate; the middle part of the sealing plate is provided with an installation notch, vertical positioning columns arranged on two sides of the installation notch and screws arranged on two sides of the vertical positioning columns; the lower end of the conical cutter handle penetrates through the mounting notch, and the conical cutter handle and the sealing plate are fixed through screws.
Preferably, the air pressure pushing mechanism comprises an air cavity and a sliding cylinder; the middle part of the air cavity is provided with a mounting port position, the mounting port position is provided with a step position and a steel column clamping shaft mounting port position arranged in the middle part of the step position, and the step position is used for placing a sliding cylinder; the steel column clamping shaft is arranged at the mounting opening of the steel column clamping shaft.
Preferably, the tool shank aligning platform is arranged at the top of the air cavity; the air cavity is arranged in the rotating table bearing;
preferably, the middle part of the knife handle alignment table is provided with an insertion opening, and two sides of the insertion opening are also provided with vertical fixing blocks; after the insertion part of the conical cutter handle is sequentially inserted into the cutter handle aligning platform, the air cavity, the sliding cylinder and the steel column clamping shaft, the sealing plate is arranged on the cutter handle aligning platform, and the mounting notch of the corresponding sealing plate is clamped and sealed with the vertical fixing block.
Preferably, a plurality of circular through holes are formed in the side wall of the steel column clamping shaft and used for clamping steel balls.
Preferably, the chuck sleeve is detachably connected with the head of the taper cutter handle through a screw.
Adopt the technical scheme of the utility model, following beneficial effect has: the utility model provides a but the precision requirement to precision parts machining in the current industry is solved the problem to concentricity, centre of a circle symmetry, machining efficiency, quick replacement etc. reach actual matching precision, but the operation of this structure quick replacement station, can use the machine from the hair pah to finished product processing and need not stop the machine and change and realize seamless butt joint, can dispose not unidimensional structure according to part size requirement, accomplish the product parts machining requirement, this structural commonality is strong, the product of the same type only needs to purchase general structure size, can help the customer reduce cost again when satisfying the customer demand.
Secondly, the method comprises the following steps: the clamping assembly is used for clamping a product, placing the workpiece product in the middle of the chute port, sliding the chuck to clamp the product by the positive claw, and solving the problems that the workpiece in the existing market is clamped by a vice, the combination time of a T-shaped block, a screw rod, a pressing plate and a nut is long, the machining concentricity is difficult to guarantee, the required manpower is large, the machine stops, and other pain points are solved; after the insertion part of the conical cutter handle is sequentially inserted into the cutter handle alignment table, the air cavity, the sliding cylinder and the steel column clamping shaft, the sealing plate is arranged on the cutter handle alignment table for sealing, the sealing performance is good, and the concentric alignment is accurate; the conical cutter handle inserting part and the air cavity are arranged in the rotating table bearing, and the air cavity can push the conical cutter handle to reciprocate by utilizing air pressure so as to tighten or loosen the conical cutter handle and quickly replace the conical cutter handle;
the taper of the cutter handle is aligned, the disc chuck can be matched according to the workpiece machining requirement, the workpiece machining and manufacturing are completed, and the one-station output of workpiece pooh finished products is realized;
the automatic fur pah of changing of the same type work piece need not stop the machine with the finished product and change, only needs to change the finished product into the fur pah and can accomplish automatic processing, compares its more intelligence of traditional processing flow, and is efficient, and is with low costs, and the consumed manpower is few.
Quick replacement: the jig is divided into an upper part and a lower part, wherein the upper part is a movable part, the lower part is a fixed part, and the combination is that the sliding cylinder is pushed by air pressure to slide so as to adjust the position of a steel ball to pull the upper half part to be fixed; the separation is realized by that the sliding cylinder is pushed by air pressure to slide so as to adjust the position of the steel ball to release the upper half part.
Concentricity, degree of symmetry of the circle center: the fixture clamping part adopts the positive jaw clamping of the three-jaw chuck, so that when the fixture is positioned, the center of a product is always in the central position of the fixture, and the concentricity and the circle center symmetry can be ensured.
Processing efficiency: this tool is mainly applicable to 4 5 machining centers on axle, and a clamping just can be processed into the finished product to the product from the blank, need not trade in the course of working and press from both sides to promote machining efficiency.
Universality: the fixture has the advantages that the fixture is mainly applicable to the size of a processed product and can be compatible with various bars with the diameter of 8-60 mm; in other shapes and sizes, the jig can be clamped only by processing a circular boss with the diameter of 8-60 at the central position.
Drawings
FIG. 1 is a first schematic view of the present invention;
FIG. 2 is a second schematic structural view of the present invention;
FIG. 3 is a sectional view of the structure of the present invention;
FIG. 4 is an exploded view of the present invention;
FIG. 5 is a schematic structural view of the sealing mechanism of the present invention;
FIG. 6 is a schematic view of the bearing structure of the rotary table of the present invention;
fig. 7 is a schematic diagram of the structure of the air cavity of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present application, a first feature "on" or "an over" a second feature unless expressly stated or limited otherwise
"under" may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact, but being in contact with each other through additional features between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 to 7, the utility model provides a disc chuck structure of quick replacement handle of a knife, include: the device comprises a clamping component 1, a conical cutter handle component 2 and a cutter handle alignment piston mechanism 3 which are arranged in sequence;
referring to fig. 1 to 4, in the present embodiment, the clamping assembly 1 is used for clamping a product, placing the product in the middle of the chute opening 103, and sliding the chuck front jaw 102 to clamp the product; the clamping assembly 1 comprises a chuck sleeve 101 and a plurality of chuck front claws 102; a plurality of sliding groove openings 103 are formed in the chuck sleeve 101, and each chuck front jaw 102 is arranged on one sliding groove opening 103 and can slide in the sliding groove opening 103; the chuck sleeve 101 is sleeved at the head of the conical cutter handle component 2; the number of the sliding groove openings 103 is 3, and the sliding groove openings are positioned in three directions of the chuck sleeve 101 and are communicated with each other; the number of the chuck positive claws 102 is 3, and each chuck positive claw is arranged on a sliding groove opening 103;
referring to fig. 4 and 5, the taper shank assembly 2 includes a taper shank 201, a wire coil 202, a plurality of bevel gears 203, and a sealing mechanism 205 disposed at a lower end of the taper shank 201; the wire coil 202 is arranged at the top of the conical cutter handle 201; each bevel gear 203 is arranged in one side part of the top of the conical cutter handle 201 and is meshed with the wire coil 202; the chuck sleeve 101 is detachably connected with the head of the conical cutter handle 201 through a screw, so that the chuck sleeve is convenient to detach; the number of the bevel gears 203 is 3, the bevel gears 203 are positioned at three positions on the top of the conical cutter handle 201, and each bevel gear 203 is arranged below the space between adjacent sliding groove openings 103; in this embodiment, the sealing plate is used for sealing when the tapered tool holder 201 is inserted into the tool holder alignment piston mechanism 3, and the sealing mechanism 205 is a sealing plate; the middle part of the sealing plate is provided with an installation notch 205a, vertical positioning columns 205b arranged on two sides of the installation notch 205a and screws 205c arranged on two sides of the vertical positioning columns 205b, and the design of the vertical positioning columns 205b is convenient for positioning the sealing plate and facilitating the rotation and fixation of the screws 205 c; the lower end of the conical cutter handle 201 penetrates through the mounting notch 205, and the conical cutter handle 201 and the sealing plate are fixed through a screw 205 c.
Referring to fig. 4, 6, and 7, the tool holder alignment piston mechanism 3 includes a rotary table bearing 301, an air pressure pushing mechanism, a steel column clamping shaft 304, and a tool holder alignment table 304; the air pressure pushing mechanism is arranged in the rotating table bearing 301; the steel column clamping shaft 305 is arranged at the end part of the air pressure pushing mechanism; the tool holder aligning table 304 is arranged at the top of the air pressure pushing mechanism; a plurality of circular through holes are formed in the side wall of the steel column clamping shaft 305 and used for clamping steel balls; the air pressure pushing mechanism comprises an air cavity 302 and a sliding cylinder 303; the middle part of the air cavity 302 is provided with a mounting port position, the mounting port position is provided with a step position 302a and a steel column clamping shaft mounting port position 302b arranged at the middle part of the step position 302a, and the step position 302a is used for placing a sliding cylinder 303; the steel column clamp shaft 305 is arranged at a steel column clamp shaft mounting opening 302 b; the tool shank aligning platform 304 is arranged at the top of the air cavity 302; the air cavity 302 is disposed in the turntable bearing 301. An insertion opening 304a is formed in the middle of the tool holder aligning table 304, and vertical fixing blocks 304b are further arranged on two sides of the insertion opening 304 a; after the insertion part of the tapered tool shank 201 is sequentially inserted into the tool shank aligning table 304a, the air cavity 302, the sliding cylinder 303 and the steel column clamping shaft 305, the sealing plate is arranged on the tool shank aligning table 30, and the mounting notch 205a of the corresponding sealing plate is clamped and sealed with the vertical fixing block 304 b.
In this embodiment, the bevel gear positioning pin 204 is used for positioning the bevel gear 203, the fixing block 307 is square, and the rotating table bearing 301 is circular; the disc chuck structure for rapidly replacing the tool holder further comprises a plurality of bevel positioning pins 204, two round thread through joints 306 and a fixing block 307; each bevel gear positioning pin 304 penetrates through the head of the conical cutter handle 201 and is arranged beside a bevel gear 203; the two round thread straight-through joints 306 are arranged at the side part of the rotating table bearing 301 side by side; the fixing block 307 is disposed at the bottom of the rotating table bearing 301.
The utility model discloses the theory of operation:
meanwhile, the clamping assembly 1 is used for clamping a product, placing the workpiece product in the middle of the chute opening 103, and sliding the chuck front claw 102 to clamp the product; the inserting part of the conical cutter handle 201 and the air cavity 302 are arranged in the rotating table bearing 301, and the air cavity 302 can push the conical cutter handle 201 to reciprocate by air pressure, so that the conical cutter handle 201 is tightened or loosened, and the conical cutter handle 201 is replaced quickly.
The utility model provides a but the precision requirement to precision parts machining in the current industry is solved the problem to concentricity, centre of a circle symmetry, machining efficiency, quick replacement etc. reach actual matching precision, but the operation of this structure quick replacement station, can use the machine from the hair pah to finished product processing and need not stop the machine and change and realize seamless butt joint, can dispose not unidimensional structure according to part size requirement, accomplish the product parts machining requirement, this structural commonality is strong, the product of the same type only needs to purchase general structure size, can help the customer reduce cost again when satisfying the customer demand.
Secondly, the method comprises the following steps: the clamping assembly is used for clamping a product, the workpiece product is placed in the middle of the chute opening, the chuck is slid to clamp the product, and the problem that the workpiece in the existing market is clamped by a vice, the combination time of a T-shaped block, a screw rod, a pressing plate and a nut is long, the processing concentricity is difficult to guarantee, the required manpower is large, the machine is stopped and the like is solved; after the insertion part of the conical cutter handle is sequentially inserted into the cutter handle alignment table, the air cavity, the sliding cylinder and the steel column clamping shaft, the sealing plate is arranged on the cutter handle alignment table for sealing, the sealing performance is good, and the concentric alignment is accurate; the inserting part of the conical cutter handle and the air cavity are arranged in the rotating table bearing, and the air cavity can push the conical cutter handle to reciprocate by air pressure so as to tighten or loosen the conical cutter handle and quickly replace the conical cutter handle;
the alignment operation of the taper of the cutter handle can match the disc chuck according to the workpiece processing requirement to complete workpiece processing and manufacturing, and the one-station output of workpiece pah finished products is realized;
the automatic fur pah of changing of the same type work piece need not stop the machine with the finished product and change, only needs to change the finished product into the fur pah and can accomplish automatic processing, compares its more intelligence of traditional processing flow, and is efficient, and is with low costs, and the consumed manpower is few.
Fast replacement: the jig is divided into an upper part and a lower part, wherein the upper part is a movable part, the lower part is a fixed part, and the combination is that the sliding cylinder is pushed by air pressure to slide so as to adjust the position of a steel ball to pull the upper half part to be fixed; the separation is also realized by that the upper half part is loosened by pushing the sliding cylinder to slide through air pressure so as to adjust the position of the steel ball.
Concentricity, degree of symmetry of the circle center: the fixture clamping part adopts the positive jaw clamping of the three-jaw chuck, so that when the fixture is positioned, the center of a product is always in the central position of the fixture, and the concentricity and the circle center symmetry can be ensured.
Processing efficiency: this tool is mainly applicable to 4 5 machining centers on axle, and a clamping just can be processed into the finished product to the product from the blank, need not trade in the course of working and press from both sides to promote machining efficiency.
Universality: the tool has the advantages that the tool is mainly applicable to the size of a processed product and is compatible with various bars with the diameter of 8-60 mm; in other shapes and sizes, the jig can be clamped only by processing a circular boss with the diameter of 8-60 at the central position.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.
Claims (10)
1. The utility model provides a disc chuck structure of quick replacement handle of a knife which characterized in that includes: the clamping assembly, the conical cutter handle assembly and the cutter handle alignment piston mechanism are arranged in sequence;
the clamping assembly comprises a chuck sleeve and a plurality of chuck positive claws; the chuck sleeve is provided with a plurality of sliding groove openings, and each chuck positive claw is arranged on one sliding groove opening and can slide in the sliding groove opening; the chuck sleeve is sleeved at the head of the conical cutter handle component;
the conical cutter handle assembly comprises a conical cutter handle, a wire coiling, a plurality of bevel gears and a sealing mechanism arranged at the lower end of the conical cutter handle; the wire coiling is arranged at the top of the conical cutter handle; each bevel gear is arranged in one side part of the top of the conical cutter handle and is meshed with the wire coil;
the knife handle alignment piston mechanism comprises a rotary table bearing, an air pressure pushing mechanism, a steel column clamping shaft and a knife handle alignment table; the air pressure pushing mechanism is arranged in the rotating table bearing; the steel column clamping shaft is arranged at the end part of the air pressure pushing mechanism; the tool holder aligning table is arranged at the top of the air pressure pushing mechanism.
2. The disc chuck structure for rapidly replacing the tool holder according to claim 1, wherein the disc chuck structure for rapidly replacing the tool holder further comprises a plurality of bevel positioning pins, two round thread through joints and a fixing block; each bevel gear positioning pin penetrates through the head of the conical cutter handle and is arranged beside a bevel gear; the two round thread straight-through joints are arranged at the side part of the bearing of the rotating table side by side; the fixed block is arranged at the bottom of the rotating table bearing.
3. The disc chuck structure for rapidly replacing the tool shank according to claim 2, wherein the number of the sliding groove openings is 3, and the sliding groove openings are positioned in three directions of the chuck sleeve and communicated with each other; the number of the chuck positive claws is 3, and each chuck positive claw is arranged on a sliding groove opening.
4. The disc chuck structure for rapidly replacing the tool shank according to claim 3, wherein the bevel gears are 3 in number and are positioned at three positions at the top of the tapered tool shank, and each bevel gear is positioned below the space between the adjacent sliding groove openings.
5. The disc chuck structure for rapidly replacing the tool shank according to claim 4, wherein the sealing mechanism is a sealing plate; the middle part of the sealing plate is provided with an installation notch, vertical positioning columns arranged at two sides of the installation notch and screws arranged at two sides of the vertical positioning columns; the lower end of the conical cutter handle penetrates through the mounting notch, and the conical cutter handle is fixed with the sealing plate through a screw.
6. The disc chuck structure for rapidly replacing the tool shank according to claim 5, wherein the chuck sleeve is detachably connected with the head of the conical tool shank through a screw.
7. The disc chuck structure capable of rapidly replacing the tool shank according to claim 5, wherein the pneumatic pushing mechanism comprises an air cavity and a sliding cylinder; the middle part of the air cavity is provided with a mounting port position, the mounting port position is provided with a step position and a steel column clamping shaft mounting port position arranged in the middle part of the step position, and the step position is used for placing a sliding cylinder; the steel column clamping shaft is arranged at the mounting opening of the steel column clamping shaft.
8. The disc chuck structure for rapidly replacing the tool shank according to claim 7, wherein the tool shank aligning table is arranged at the top of the air cavity; the air cavity is arranged in the bearing of the rotating table.
9. The disc chuck structure for rapidly replacing the knife handle according to claim 8, wherein an insertion hole is formed in the middle of the knife handle alignment table, and vertical fixing blocks are further arranged on two sides of the insertion hole; after the insertion part of the conical cutter handle is sequentially inserted into the cutter handle aligning platform, the air cavity, the sliding cylinder and the steel column clamping shaft, the sealing plate is arranged on the cutter handle aligning platform, and the mounting notch of the corresponding sealing plate is clamped and sealed with the vertical fixing block.
10. The disc chuck structure for rapidly replacing the tool holder according to claim 8, wherein a plurality of circular through holes are formed in the side wall of the steel column clamping shaft and used for clamping steel balls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221850911.XU CN217800241U (en) | 2022-07-18 | 2022-07-18 | Disc chuck structure with rapidly replaced knife handle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221850911.XU CN217800241U (en) | 2022-07-18 | 2022-07-18 | Disc chuck structure with rapidly replaced knife handle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217800241U true CN217800241U (en) | 2022-11-15 |
Family
ID=83967340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221850911.XU Active CN217800241U (en) | 2022-07-18 | 2022-07-18 | Disc chuck structure with rapidly replaced knife handle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217800241U (en) |
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2022
- 2022-07-18 CN CN202221850911.XU patent/CN217800241U/en active Active
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