CN215545200U - Pre-milling assembly - Google Patents
Pre-milling assembly Download PDFInfo
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- CN215545200U CN215545200U CN202122173119.7U CN202122173119U CN215545200U CN 215545200 U CN215545200 U CN 215545200U CN 202122173119 U CN202122173119 U CN 202122173119U CN 215545200 U CN215545200 U CN 215545200U
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Abstract
The application belongs to the technical field of machining treatment equipment, and particularly relates to a pre-milling assembly. The pre-milling assembly comprises: the device comprises an upper sliding plate, a lower sliding plate, a transverse guide rail pair, a motor bottom plate, a motor mounting frame, a motor adjusting seat, an adjusting screw rod, a linear driving assembly, a cutter and a servo motor; the pre-milling assembly is simple and compact in structure, small in size, convenient to install and use, small in required installation space, capable of being conveniently configured on the production line of various devices, driven by the motor and the cylinder, capable of achieving convenient automatic continuous production and capable of improving automation level and enterprise production efficiency.
Description
Technical Field
The application belongs to the technical field of machining treatment equipment, and particularly relates to a pre-milling assembly.
Background
Along with the continuous popularization and application of smart machine, each type of intelligent production processing equipment continuously replaces traditional old equipment, for the realization of enterprise reduces the human input, improves product quality and stability, improves enterprise production operational environment and provides effective help, along with the continuous increase of market and customer demand, smart machine manufacturing enterprise's production pressure also begins to increase, often needs manufacturing enterprise can be high-quality continuous production fast.
Disclosure of Invention
An object of this application is to provide one kind and is convenient for carry out automated control, realizes high-efficient continuity of operation for all kinds of raw and other materials carry out the assembly that mills in advance of processing treatment.
In order to achieve the purpose, the following technical scheme is adopted in the application.
The pre-milling assembly comprises two pre-milling components 1 which are arranged oppositely;
the pre-milling assembly 1 comprises: the device comprises an upper sliding plate 10, a lower sliding plate 10, a transverse guide rail pair 11, a motor bottom plate 12, a motor mounting frame 13, a motor adjusting seat 14, an adjusting screw rod 15, a linear driving assembly 16, a cutter 17 and a servo motor 18;
the up-down sliding plate 10 is arranged at one side of the production line in a vertically sliding manner, and the plate surface of the up-down sliding plate 1 is vertical to the ground and the advancing direction of the part to be processed; two guide rail grooves are arranged on one large end surface of the up-down sliding plate 10 in parallel, and screw holes are arranged at the bottoms of the guide rail grooves;
the transverse guide rail pair 11 comprises two guide rail sliding block groups which are arranged in parallel, and a linear guide rail 110 on each guide rail sliding block group is connected with a screw hole at the bottom of a guide rail groove through a bolt and extends along the front-back direction; the sliding block 111 on the guide rail sliding block group is fixedly connected with the motor bottom plate 12 through a bolt group;
the motor bottom plate 12 is arranged in parallel with the up-down sliding plate 1, and the motor bottom plate 12 is connected to the up-down sliding plate 1 in a front-back sliding manner through a transverse guide rail pair 11;
the linear drive assembly 16 includes: a linear cylinder 160, a cylinder mounting plate 161, a cylinder connecting plate 162;
the cylinder mounting plate 161 is arranged at the rear side of the up-down sliding plate 10, the linear cylinder 160 is mounted on the cylinder mounting plate 161, and the cylinder shaft of the linear cylinder 160 is arranged in parallel with the linear guide rail 110; the cylinder connecting plate 162 is positioned between the up-down sliding plate 10 and the motor base plate 12 and fixedly arranged on the motor base plate 12, a cylinder shaft connecting hole 162a for connecting with a cylinder shaft of the linear cylinder 160 is formed in the cylinder connecting plate 162, and the cylinder shaft of the linear cylinder 160 is detachably fixed in the cylinder shaft connecting hole 162 a;
the motor mounting frame 13 is fixedly arranged on the motor bottom plate 12 through a bolt group; the motor mount 13 includes: a vertical plate 130 parallel to and closely attached to the motor bottom plate 12, a horizontal plate 131 horizontally arranged and connected with the vertical plate 130, a triangular rib plate 132 connecting the vertical plate 130 and the horizontal plate 131, and a motor connecting plate 133 adjustably arranged at the bottom of the horizontal plate 131;
the vertical plate 130 and the up-down sliding plate 10 are respectively arranged at two sides of the motor bottom plate 12;
the bottom of the horizontal plate 131 is provided with a strip-shaped connecting groove 131a, and the strip-shaped connecting groove 131a is a linear groove; the groove bottom of the strip-shaped connecting groove 131a is provided with a plurality of strip-shaped holes 131 b; the strip-shaped holes 131b extend in the front-rear direction;
the motor connecting plate 133 is slidably installed in the bar-shaped connecting groove 131a back and forth; the motor connecting plate 133 is provided with a screw hole corresponding to the strip-shaped hole 131b, and the motor connecting plate 133 is connected through a bolt which passes through the strip-shaped hole 131b and is screwed into the screw hole; a servo motor mounting hole is formed at the bottom of the motor connecting plate 133; the servo motor 18 is fixed on the motor connecting plate 133 through a bolt group; the cutter is arranged on a motor shaft of the servo motor 18;
the motor adjusting seat 14 is of an inverted right-angle plate structure and comprises a horizontal plate surface 140 connected with the motor mounting frame 13 and a vertical plate surface 141 extending vertically downwards, and an adjusting screw hole is formed in the vertical plate surface 141; the adjusting screw holes are dug out along the front-back direction and run through the vertical plate surface 141;
the adjusting screw 15 is screwed into the adjusting screw hole, and the front end of the adjusting screw is rotatably connected with the motor connecting plate 133.
The technical scheme for further improving or optimizing the pre-milling assembly further comprises that the two pre-milling components are arranged along the advancing direction of the part to be processed and are symmetrically arranged, and specifically, in the two pre-milling components: the two up-down sliding plates are arranged on the outer side, the two motor mounting frames are arranged on the inner side, and the two servo motors point to the front side.
A further improvement or preferred solution of the pre-milling assembly further comprises that the rear end of the adjusting screw 15 is provided with a six-sided cylindrical adjusting part 150
The further improvement or the preferable technical scheme of the pre-milling assembly also comprises that the upper and lower sliding plates 1 are supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a rack driving structure; the rack driving structure includes: the device comprises a rack seat fixedly arranged, a rack vertically arranged, a gear matched with the rack and rolling up and down along the rack, and a gear seat fixed on an upper sliding plate and a lower sliding plate 1;
the rack seat is provided with a rack mounting groove which extends vertically; a plurality of rack fixing screw holes are formed in the bottom of the rack mounting groove; the rack fixing screw holes are uniformly arranged along the extension direction of the rack mounting groove; a plurality of connecting holes are formed in the rack, and the pitch of the connecting holes is consistent with that of the rack fixing screw hole; the rack is fixed by a plurality of bolts arranged in the connecting hole and the rack fixing screw hole in a linking way; the gear is rotatably and fixedly arranged on the gear seat; the rack driving motor is used for driving the gear to rotate.
The further improvement or the preferable technical scheme of the pre-milling assembly also comprises that the upper and lower sliding plates 1 are supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a lead screw driving mechanism; the screw drive mechanism includes: the device comprises a ball screw mounting seat, a ball screw, a screw nut, a polish rod connecting block and a screw driving motor, wherein the ball screw mounting seat is fixedly arranged, the ball screw is vertically arranged, the screw nut is sleeved on the ball screw together with the ball screw, the polish rod is vertically arranged, the polish rod connecting block is sleeved on the polish rod, and the screw driving motor is used for driving the ball screw to rotate; the lead screw nut and the polished rod connecting block are connected with the upper and lower sliding plates 1 through bolt sets.
The further improvement or the preferable technical scheme of the pre-milling assembly also comprises that the upper and lower sliding plates 1 are supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a chain belt driving structure; the chain belt driving structure includes: the chain belt supporting seat is fixedly arranged, the driving wheel and the driven wheel are fixedly arranged on the chain belt supporting seat, the chain wheel driving motor is connected with the driving wheel, the chain belt is sleeved on the driving wheel and the driven wheel, and the connecting clamping block is fixed on the chain belt; the driving wheel and the driven wheel are vertically arranged up and down so that the chain belt can vertically rotate, and the connecting clamping block is connected with the up-down sliding plate 1.
The beneficial effects are that:
the pre-milling assembly is simple and compact in structure, small in size, convenient to install and use, small in required installation space, capable of being conveniently configured on the production line of various devices, driven by the motor and the cylinder, capable of achieving convenient automatic continuous production and capable of improving automation level and enterprise production efficiency.
Drawings
FIG. 1 is a front view of a pre-mill assembly;
FIG. 2 is a top view of the pre-mill assembly;
FIG. 3 is a front view of the pre-mill assembly;
FIG. 4 is a side view of the pre-mill assembly;
FIG. 5 is a front view of the pre-mill assembly;
wherein the reference numerals include:
the vertical sliding plate 10, the transverse guide rail pair 11, the linear guide rail 110, the sliding block 111, the motor bottom plate 12, the motor mounting frame 13, the vertical plate 130, the horizontal plate 131, the strip-shaped connecting groove 131a, the strip-shaped hole 131b, the triangular rib plate 132, the motor connecting plate 133, the motor adjusting seat 14, the horizontal plate surface 140, the vertical plate surface 141, the adjusting screw 15, the hexahedral cylindrical adjusting part 150, the linear driving assembly 16, the linear cylinder 160, the cylinder mounting plate 161, the cylinder connecting plate 162, the cylinder shaft connecting hole 162a, the cutter 17 and the servo motor 18.
Detailed Description
The present application will be described in detail with reference to specific examples.
The utility model provides a mill assembly in advance, the processing and the processing of raw and other materials such as all kinds of panels of mainly used, tubular product realize cutting off, mill operation such as in advance, and configuration that can be convenient uses or independent utility near each type production line, and easy dismounting controls simple and can be convenient the automatic transformation of carrying on.
As shown in fig. 1, 2 and 3, the basic mechanism comprises two oppositely arranged pre-milling assemblies 1 and 2; the two pre-milling assemblies have the same structure and composition, are different only in installation position and are matched with each other, wherein
The pre-milling assembly 1 comprises: the device comprises an upper sliding plate 10, a lower sliding plate 10, a transverse guide rail pair 11, a motor bottom plate 12, a motor mounting frame 13, a motor adjusting seat 14, an adjusting screw rod 15, a linear driving assembly 16, a cutter 17 and a servo motor 18;
the up-down sliding plate 10 is arranged at one side of the production line in a way of sliding up and down, and the plate surface of the up-down sliding plate 1 is simultaneously vertical to the ground and the advancing direction of the part to be processed; two guide rail grooves are arranged on one large end surface of the up-down sliding plate 10 in parallel, and screw holes are arranged at the bottoms of the guide rail grooves;
the transverse guide rail pair 11 comprises two guide rail sliding block groups which are arranged in parallel, and a linear guide rail 110 on each guide rail sliding block group is connected with a screw hole at the bottom of a guide rail groove through a bolt and extends along the front-back direction; the sliding block 111 on the guide rail sliding block group is fixedly connected with the motor bottom plate 12 through a bolt group;
the motor bottom plate 12 is arranged in parallel with the up-down sliding plate 1, and the motor bottom plate 12 is connected to the up-down sliding plate 1 in a front-back sliding manner through a transverse guide rail pair 11;
the linear drive assembly 16 includes: a linear cylinder 160, a cylinder mounting plate 161, a cylinder connecting plate 162;
the cylinder mounting plate 161 is arranged at the rear side of the up-down sliding plate 10, the linear cylinder 160 is mounted on the cylinder mounting plate 161, and the cylinder shaft of the linear cylinder 160 is arranged in parallel with the linear guide rail 110; the cylinder connecting plate 162 is positioned between the up-down sliding plate 10 and the motor base plate 12 and fixedly arranged on the motor base plate 12, a cylinder shaft connecting hole 162a for connecting with a cylinder shaft of the linear cylinder 160 is formed in the cylinder connecting plate 162, and the cylinder shaft of the linear cylinder 160 is detachably fixed in the cylinder shaft connecting hole 162 a;
the motor mounting frame 13 is fixedly arranged on the motor bottom plate 12 through a bolt group; the motor mount 13 includes: a vertical plate 130 parallel to and closely attached to the motor bottom plate 12, a horizontal plate 131 horizontally arranged and connected with the vertical plate 130, a triangular rib plate 132 connecting the vertical plate 130 and the horizontal plate 131, and a motor connecting plate 133 adjustably arranged at the bottom of the horizontal plate 131;
the vertical plate 130 and the up-down sliding plate 10 are respectively arranged at two sides of the motor bottom plate 12;
the bottom of the horizontal plate 131 is provided with a bar-shaped connecting groove 131a, and the bar-shaped connecting groove 131a is a linear groove; the groove bottom of the strip-shaped connecting groove 131a is provided with a plurality of strip-shaped holes 131 b; the strip-shaped holes 131b extend in the front-rear direction;
the motor connecting plate 133 is slidably installed in the bar-shaped connecting groove 131a back and forth; the motor connecting plate 133 is provided with a screw hole corresponding to the strip-shaped hole 131b, and the motor connecting plate 133 is connected through a bolt which passes through the strip-shaped hole 131b and is screwed into the screw hole; a servo motor mounting hole is formed at the bottom of the motor connecting plate 133; the servo motor 18 is fixed on the motor connecting plate 133 through a bolt group; the cutter is arranged on a motor shaft of the servo motor 18;
the motor adjusting seat 14 is of an inverted right-angle plate structure and comprises a horizontal plate surface 140 connected with the motor mounting frame 13 and a vertical plate surface 141 extending vertically downwards, and an adjusting screw hole is formed in the vertical plate surface 141; the adjusting screw holes are dug out along the front-back direction and run through the vertical plate surface 141;
the adjusting screw 15 is screwed into the adjusting screw hole, and the front end of the adjusting screw is rotatably connected with the motor connecting plate 133.
Two mill the subassembly in advance and arrange and the symmetry setting along waiting to process part advancing direction, specifically speaking, in two mill the subassembly in advance: the two up-down sliding plates are arranged on the outer side, the two motor mounting frames are arranged on the inner side, and the two servo motors point to the front side.
The rear end of the adjusting screw 15 is provided with a six-sided cylindrical adjusting part 150
The up-down sliding plate 10 is supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a rack driving structure; the rack driving structure includes: the device comprises a rack seat fixedly arranged, a rack vertically arranged, a gear matched with the rack and rolling up and down along the rack, and a gear seat fixed on an upper sliding plate and a lower sliding plate 1;
the rack seat is provided with a rack mounting groove which extends vertically; a plurality of rack fixing screw holes are formed in the bottom of the rack mounting groove; the rack fixing screw holes are uniformly arranged along the extension direction of the rack mounting groove; a plurality of connecting holes are formed in the rack, and the pitch of the connecting holes is consistent with that of the rack fixing screw hole; the rack is fixed by a plurality of bolts arranged in the connecting hole and the rack fixing screw hole in a linking way; the gear is rotatably and fixedly arranged on the gear seat; the rack driving motor is used for driving the gear to rotate.
The up-down sliding plate 10 is supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a lead screw driving mechanism; the screw drive mechanism includes: the device comprises a ball screw mounting seat, a ball screw, a screw nut, a polish rod connecting block and a screw driving motor, wherein the ball screw mounting seat is fixedly arranged, the ball screw is vertically arranged, the screw nut is sleeved on the ball screw together with the ball screw, the polish rod is vertically arranged, the polish rod connecting block is sleeved on the polish rod, and the screw driving motor is used for driving the ball screw to rotate; the lead screw nut and the polished rod connecting block are connected with the up-down sliding plate 1 through a bolt group.
The up-down sliding plate 10 is supported at one side of the production line through a lifting adjusting device; the lifting adjusting device is a chain belt driving structure; the chain belt driving structure includes: the chain belt supporting seat is fixedly arranged, the driving wheel and the driven wheel are fixedly arranged on the chain belt supporting seat, the chain wheel driving motor is connected with the driving wheel, the chain belt is sleeved on the driving wheel and the driven wheel, and the connecting clamping block is fixed on the chain belt; the driving wheel and the driven wheel are vertically arranged up and down so that the chain belt can vertically rotate, and the connecting clamping block is connected with the up-down sliding plate 10.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (6)
1. A pre-milling assembly, which is characterized by comprising two pre-milling components (1) which are oppositely arranged;
the pre-milling assembly (1) comprises: the device comprises an upper sliding plate, a lower sliding plate (10), a transverse guide rail pair (11), a motor bottom plate (12), a motor mounting frame (13), a motor adjusting seat (14), an adjusting screw rod (15), a linear driving assembly (16), a cutter (17) and a servo motor (18);
the up-down sliding plate (10) is arranged on one side of the production line in a vertically sliding manner, and the plate surface of the up-down sliding plate (10) is vertical to the ground and the advancing direction of the part to be processed; two guide rail grooves are arranged on one large end surface of the up-down sliding plate (10) in parallel, and screw holes are arranged at the bottoms of the guide rail grooves;
the transverse guide rail pair (11) comprises two guide rail sliding block groups which are arranged in parallel, and a linear guide rail (110) on each guide rail sliding block group is connected with a screw hole at the bottom of each guide rail groove through a bolt and extends along the front-back direction; the sliding block (111) on the guide rail sliding block group is fixedly connected with the motor bottom plate (12) through a bolt group;
the motor bottom plate (12) is arranged in parallel with the up-down sliding plate (10), and the motor bottom plate (12) is connected to the up-down sliding plate (10) in a front-back sliding manner through a transverse guide rail pair (11);
the linear drive assembly (16) comprises: the air cylinder structure comprises a linear air cylinder (160), an air cylinder mounting plate (161) and an air cylinder connecting plate (162);
the cylinder mounting plate (161) is arranged at the rear side of the up-down sliding plate (10), the linear cylinder (160) is arranged on the cylinder mounting plate (161), and a cylinder shaft of the linear cylinder (160) is arranged in parallel with the linear guide rail (110); the air cylinder connecting plate (162) is positioned between the up-down sliding plate (10) and the motor bottom plate (12) and is fixedly arranged on the motor bottom plate (12), an air cylinder shaft connecting hole (162a) used for being connected with an air cylinder shaft of the linear air cylinder (160) is formed in the air cylinder connecting plate (162), and the air cylinder shaft of the linear air cylinder (160) is detachably fixed in the air cylinder shaft connecting hole (162 a);
the motor mounting frame (13) is fixedly arranged on the motor bottom plate (12) through a bolt group; the motor mounting bracket (13) includes: the motor base plate comprises a vertical plate (130) which is parallel to and closely attached to the motor base plate (12), a horizontal plate (131) which is horizontally arranged and connected with the vertical plate (130), triangular rib plates (132) which connect the vertical plate (130) and the horizontal plate (131), and a motor connecting plate (133) which is adjustably arranged at the bottom of the horizontal plate (131);
the vertical plate (130) and the up-down sliding plate (10) are respectively arranged at two sides of the motor bottom plate (12);
the bottom of the horizontal plate (131) is provided with a strip-shaped connecting groove (131a), and the strip-shaped connecting groove (131a) is a linear groove; a plurality of strip-shaped holes (131b) are formed in the bottoms of the strip-shaped connecting grooves (131 a); the strip-shaped holes (131b) extend in the front-rear direction;
the motor connecting plate (133) is arranged in the strip-shaped connecting groove (131a) in a sliding manner back and forth; the motor connecting plate (133) is provided with a screw hole corresponding to the strip-shaped hole (131b), and the motor connecting plate (133) is connected through a bolt which penetrates through the strip-shaped hole (131b) and is screwed into the screw hole; a servo motor mounting hole is formed in the bottom of the motor connecting plate (133); the servo motor (18) is fixed on the motor connecting plate (133) through a bolt group; the cutter is arranged on a motor shaft of the servo motor (18);
the motor adjusting seat (14) is of an inverted right-angle plate structure and comprises a horizontal plate surface (140) connected with the motor mounting frame (13) and a vertical plate surface (141) extending vertically downwards, and adjusting screw holes are formed in the vertical plate surface (141); the adjusting screw hole is dug out along the front-back direction and penetrates through the vertical plate surface (141);
the adjusting screw rod (15) is screwed into the adjusting screw hole, and the front end of the adjusting screw rod is rotatably connected with the motor connecting plate (133).
2. The pre-milling assembly as claimed in claim 1, characterized in that two pre-milling assemblies are arranged and arranged symmetrically in the advancing direction of the part to be machined, in particular, in that: the two up-down sliding plates are arranged on the outer side, the two motor mounting frames are arranged on the inner side, and the two servo motors point to the front side.
3. A pre-milling assembly as set forth in claim 1, characterized in that the rear end of the adjusting screw (15) is provided with a six-sided cylindrical adjusting portion (150).
4. A pre-milling assembly as set forth in claim 1, characterized in that said upper and lower slides (10) are supported on one side of the production line by means of a lifting adjustment device; the lifting adjusting device is a rack driving structure; the rack driving structure includes: the device comprises a rack seat fixedly arranged, a rack vertically arranged, a gear matched with the rack and rolling up and down along the rack, and a gear seat fixed on an up-down sliding plate (10);
the rack seat is provided with a rack mounting groove which extends vertically; a plurality of rack fixing screw holes are formed in the bottom of the rack mounting groove; the rack fixing screw holes are uniformly arranged along the extension direction of the rack mounting groove; a plurality of connecting holes are formed in the rack, and the pitch of the connecting holes is consistent with that of the rack fixing screw hole; the rack is fixed by a plurality of bolts arranged in the connecting hole and the rack fixing screw hole in a linking way; the gear is rotatably and fixedly arranged on the gear seat; the rack driving motor is used for driving the gear to rotate.
5. A pre-milling assembly as set forth in claim 1, characterized in that said upper and lower slides (10) are supported on one side of the production line by means of a lifting adjustment device; the lifting adjusting device is a lead screw driving mechanism; the screw drive mechanism includes: the device comprises a ball screw mounting seat, a ball screw, a screw nut, a polish rod connecting block and a screw driving motor, wherein the ball screw mounting seat is fixedly arranged, the ball screw is vertically arranged, the screw nut is sleeved on the ball screw together with the ball screw, the polish rod is vertically arranged, the polish rod connecting block is sleeved on the polish rod, and the screw driving motor is used for driving the ball screw to rotate; the lead screw nut and the polished rod connecting block are connected with the upper and lower sliding plates (10) through a bolt group.
6. A pre-milling assembly as set forth in claim 1, characterized in that said upper and lower slides (10) are supported on one side of the production line by means of a lifting adjustment device; the lifting adjusting device is a chain belt driving structure; the chain belt driving structure includes: the chain belt supporting seat is fixedly arranged, the driving wheel and the driven wheel are fixedly arranged on the chain belt supporting seat, the chain wheel driving motor is connected with the driving wheel, the chain belt is sleeved on the driving wheel and the driven wheel, and the connecting clamping block is fixed on the chain belt; the driving wheel and the driven wheel are vertically arranged up and down so that the chain belt can vertically rotate, and the connecting clamping block is connected with the up-down sliding plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122173119.7U CN215545200U (en) | 2021-09-08 | 2021-09-08 | Pre-milling assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122173119.7U CN215545200U (en) | 2021-09-08 | 2021-09-08 | Pre-milling assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215545200U true CN215545200U (en) | 2022-01-18 |
Family
ID=79848967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122173119.7U Active CN215545200U (en) | 2021-09-08 | 2021-09-08 | Pre-milling assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215545200U (en) |
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2021
- 2021-09-08 CN CN202122173119.7U patent/CN215545200U/en active Active
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