阅读说明：本技术 一种用于微盾构顶管机刀盘的防缠绕刀头装置 (Anti-winding cutter head device for cutter head of micro-shield pipe jacking machine ) 是由 孙余好 邢鹏飞 吴亚华 李品瑞 黄志华 李苏霖 周煌 吴昊 张�浩 于 2021-09-07 设计创作，主要内容包括：本发明属于地下管道施工技术领域,尤其涉及一种用于微盾构顶管机刀盘的防缠绕刀头装置。本发明通过切割刀单元,设置在顶管机刀盘上并用于安装切割刀单元的槽体单元,以及设置在槽体单元上并用于带动切割刀单元平移的活动板单元实现了刀头随刀盘旋转前进的同时自身左右往复运动以实现切割破碎纤维阻挡物,从而避免纤维阻挡物缠绕刀盘的技术效果。本发明具有锯齿形刀头快速挖掘土壤,刀头大锯齿上设有多个小锯齿槽在左右往复运动时可快速切割破碎纤维阻挡物,刀柄处设置有遮挡板使得挖掘时产生的泥沙被阻挡在安装槽之外,以及设计了可打开式滑动槽能够轻松安装遮挡板同时方便替换磨损刀头的优点。(The invention belongs to the technical field of underground pipeline construction, and particularly relates to an anti-winding cutter head device for a cutter head of a micro-shield pipe jacking machine. According to the invention, through the cutting knife unit, the groove body unit which is arranged on the cutter head of the pipe pushing jack and used for mounting the cutting knife unit and the movable plate unit which is arranged on the groove body unit and used for driving the cutting knife unit to translate, the left and right reciprocating motion of the cutter head is realized while the cutter head moves forwards along with the rotation of the cutter head, so that the technical effect of cutting broken fiber barriers is realized, and the fiber barriers are prevented from winding the cutter head. The invention has the advantages that the saw-tooth-shaped cutter head can rapidly excavate soil, the plurality of small saw-tooth grooves are arranged on the large saw tooth of the cutter head, the broken fiber barriers can be rapidly cut when the cutter head reciprocates left and right, the baffle plate is arranged at the position of the cutter handle, so that silt generated during excavation is blocked outside the installation groove, and the openable sliding groove is designed, so that the baffle plate can be easily installed, and meanwhile, the worn cutter head can be conveniently replaced.)

1. The utility model provides an antiwind tool bit device for declining shield push bench blade disc, its characterized in that, includes cutting knife unit (1), sets up on cutter body groove that push bench blade disc (A) was predetermine and is used for the installation cell body unit (3) of cutting knife unit (1), and set up on cell body unit (3) and through driving cutting knife unit (1) reciprocating motion's mode is in order to be used for improving fly leaf unit (2) to debris shredding ability.

2. The anti-wind cutter head device for push bench cutterhead according to claim 1, the cutter unit (1) includes a shank portion (101) disposed on the movable plate unit (2), and a cutter head portion (102) disposed on the shank portion (101).

3. The anti-wind cutter head device for the cutter head of the push bench according to claim 2, wherein the cutter head part (102) comprises a long cutter head (102 a) arranged on the cutter handle part (101), two short cutter heads (102 b) arranged on the cutter handle part (101) and positioned at the left and right sides of the long cutter head (102 a), and a cambered cutter head (102 c) arranged on the cutter handle part (101) and positioned at one side of the short cutter head (102 b) different from the long cutter head (102 a).

4. The anti-wind bit tool device for a push bench cutterhead according to claim 3, wherein the bit section (102) further comprises serrated grooves (102 d) provided on the long bit (102 a), short bit (102 b) and cambered bit (102 c).

5. The anti-winding cutter head device for the cutter head of the pipe push bench according to claim 3, wherein the cutter handle portion (101) comprises a cutter handle block (101 a) for mounting the long cutter head (102 a), the short cutter head (102 b) and the arc cutter head (102 c), a cutter handle mounting groove (101 b) provided on the bottom surface of the cutter handle block (101 a) for mounting the movable plate unit (2), and a cutter handle screw hole (101 c) provided on the bottom surface of the cutter handle block (101 a); the movable plate unit (2) comprises a fixing column (201) arranged on the cutter handle mounting groove (101 b), a fixing ring (202) arranged on the annular surface of the fixing column (201), a fixing ring screw hole (203) arranged on the fixing ring (202) and used for being connected with the cutter handle screw hole (101 c), and a fixing ring bolt (204) used for being in threaded connection with the cutter handle screw hole (101 c) and the fixing ring screw hole (203).

6. The anti-wind bit tool device for a push bench cutterhead according to claim 5, wherein said shank portion (101) further includes a shield plate (101 d) provided on said shank block (101 a) for shielding earth splashed during excavation; the groove body unit (3) comprises a mounting groove body (301) used for mounting the cutting knife unit (1) and the movable plate unit (2), a containing groove (302) arranged on the side face of the mounting groove body (301) and used for mounting the shielding plate (101 d), and a rolling column (303) arranged on the side face of the containing groove (302) and attached to the shielding plate (101 d).

7. The anti-wind cutter head device for a push bench cutterhead according to claim 6, wherein said cutter shank portion (101) further includes a sliding plate (101 e) disposed on the side of said shutter (101 d); the tank body unit (3) further comprises a sliding groove (304) which is arranged on the side surface of the installation tank body (301) and is used for installing the sliding plate (101 e), and a spring (305) which is arranged on the side surface of the accommodating groove (302) and is used for jacking up the side surface of the shielding plate (101 d).

8. The anti-winding cutter head device for the cutter head of the pipe push bench according to claim 7, wherein the groove body unit (3) further comprises a cover plate (306) arranged on the sliding groove (304), a hinge (307) arranged on the top surface of the cover plate (306) and the mounting groove body (301), and a locking plate (308) arranged on the cover plate (306) and used for being connected with the top surface of the mounting groove body (301).

9. The anti-winding cutter head device for the cutter head of the pipe push bench according to claim 5, wherein the movable plate unit (2) further comprises a movable plate (205) arranged on the bottom surface of the fixed column (201), a pushing column (206) arranged on the side surface of the movable plate (205), and a cylinder (207) arranged on the side surface of the installation groove body (301) and used for pushing the pushing column (206).

10. The anti-winding cutter head device for the cutter head of the pipe push bench according to claim 9, wherein the groove body unit (3) further comprises a limit groove (309) which is arranged on the inner bottom surface of the installation groove body (301) and used for installing the movable plate (205).

Technical Field

The invention belongs to the technical field of underground pipeline construction, and particularly relates to an anti-winding cutter head device for a cutter head of a micro-shield pipe jacking machine.

Background

Underground pipe refers to a pipe laid underground for transporting liquid, gas or loose solid. Underground pipelines are paved by adopting a non-excavation construction technology at present, and underground jacking pipes are particularly common and necessary for not influencing ground traffic particularly when passing through downtown areas and traffic main lines. During non-excavation operation, a hydraulic push bench in the shape of a micro shield machine is needed to excavate pipeline lines, and the push bench generally has a rotatable cutter head which drives a cutting cutter head arranged on the cutter head to rotate to cut soil, so that a pipeline is formed for subsequent pipeline laying. However, the geological environment through which the pipe jacking passes is often complex, for example, when a structure or a road is penetrated downwards, a plastic drainage plate for consolidating soil and improving bearing capacity is often buried by geogrid or geotextile buried by enhancing the stability of a foundation, such as a rib-shaped or wire-shaped geotechnical barrier, which can adversely affect the excavation process, when a cutter head is not enough to cut up plastic fibers, the fibers can be wound on the cutter head until the cutter head stops rotating, so that the rotary motor is damaged, and therefore, a cutter head device for the cutter head of the micro shield pipe jacking machine, which can realize rapid cutting of the fibers and avoid winding, is urgently needed in the market.

Chinese invention with patent publication No. CN109915158B and publication No. 2019.06.21 discloses a shield machine cutter for cutting an underground consolidated drainage plate and a braid, comprising: a cutter body, a cutter head and a cutter head sharp edge; the tool bit is inlayed the head of cutter body, the tool bit sharp sword is inlayed on the tool bit, and the height of tool bit sharp sword is greater than predetermined height, and the blade contained angle of tool bit sharp sword is less than predetermined angle, and the tool bit sharp sword is trilateral setting, and its side is the trapezoidal of falling.

Although the cutter bit sharp edge in the invention can cut the consolidated drainage plate and the braided fabric into segments, the winding of the drainage plate and the braided fabric on the cutter head is reduced; however, the invention has the defects that the sharp edge of the cutter head cannot move autonomously and can only be driven by the cutter disc to cut, and the cutting efficiency is not high enough.

Disclosure of Invention

The invention aims to provide an anti-winding cutter head device for a micro-shield push bench cutter head. The invention has the advantages that the saw-tooth-shaped cutter head can rapidly excavate soil, the plurality of small saw-tooth grooves are arranged on the large saw tooth of the cutter head, the broken fiber barriers can be rapidly cut when the cutter head reciprocates left and right, the baffle plate is arranged at the position of the cutter handle, so that silt generated during excavation is blocked outside the installation groove, and the openable sliding groove is designed, so that the baffle plate can be easily installed, and meanwhile, the worn cutter head can be conveniently replaced.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides an antiwind tool bit device for declining shield push bench blade disc, includes cutting knife unit, sets up on the cutter body groove that push bench blade disc was predetermine and be used for the installation the cell body unit of cutting knife unit, and set up on the cell body unit and through driving cutting knife unit reciprocating motion's mode is in order to be used for improving the fly leaf unit to debris shredding ability.

The further preferred technical scheme is as follows: the cutting knife unit comprises a knife handle part arranged on the movable plate unit and a knife head part arranged on the knife handle part.

The further preferred technical scheme is as follows: the knife head portion is including setting up long tool bit on the handle of a knife portion sets up on the handle of a knife portion and be located two of the long tool bit left and right sides short tool bit, and set up on the handle of a knife portion and be located short tool bit is different from the cambered surface tool bit of long tool bit one side.

The further preferred technical scheme is as follows: the knife head part also comprises sawtooth grooves arranged on the long knife head, the short knife head and the cambered surface knife head.

The further preferred technical scheme is as follows: the knife handle part comprises a knife handle block for mounting the long knife head, the short knife head and the cambered surface knife head, a knife handle mounting groove which is arranged on the bottom surface of the knife handle block and used for mounting the movable plate unit, and a knife handle screw hole which is arranged on the bottom surface of the knife handle block; the movable plate unit comprises a fixing column arranged on the knife handle mounting groove, a fixing ring arranged on the annular surface of the fixing column, a fixing ring screw hole arranged on the fixing ring and used for being connected with the knife handle screw hole, and a fixing ring bolt used for being in threaded connection with the knife handle screw hole and the fixing ring screw hole.

The further preferred technical scheme is as follows: the cutter handle part also comprises a shielding plate which is arranged on the cutter handle block and is used for shielding soil splashed during excavation; the cell body unit is including being used for the installation the cutting knife unit with the installation cell body of fly leaf unit sets up on the installation cell body side and be used for the installation the holding tank of shielding plate, and set up on the holding tank side and with the rolling post of shielding plate laminating.

The further preferred technical scheme is as follows: the handle portion further comprises a sliding plate disposed on a side of the shutter; the tank body unit further comprises a sliding groove which is arranged on the side surface of the mounting tank body and used for mounting the sliding plate, and a spring which is arranged on the side surface of the mounting tank and used for jacking up the side surface of the shielding plate.

The further preferred technical scheme is as follows: the groove body unit further comprises an cover plate arranged on the sliding groove, a hinge arranged on the cover plate and the top surface of the installation groove body, and a locking plate arranged on the cover plate and used for being connected with the top surface of the installation groove body.

The further preferred technical scheme is as follows: the movable plate unit further comprises a movable plate arranged on the bottom surface of the fixed column, a pushing column arranged on the side surface of the movable plate, and a cylinder arranged on the side surface of the mounting groove body and used for pushing the pushing column.

The further preferred technical scheme is as follows: the groove body unit further comprises a limiting groove which is arranged on the inner bottom surface of the installation groove body and used for installing the movable plate.

According to the invention, through the cutting knife unit, the groove body unit which is arranged on the cutter head of the pipe pushing jack and used for mounting the cutting knife unit and the movable plate unit which is arranged on the groove body unit and used for driving the cutting knife unit to translate, the left and right reciprocating motion of the cutter head is realized while the cutter head moves forwards along with the rotation of the cutter head, so that the technical effect of cutting broken fiber barriers is realized, and the fiber barriers are prevented from winding the cutter head. The invention has the advantages that the saw-tooth-shaped cutter head can rapidly excavate soil, the plurality of small saw-tooth grooves are arranged on the large saw tooth of the cutter head, the broken fiber barriers can be rapidly cut when the cutter head reciprocates left and right, the baffle plate is arranged at the position of the cutter handle, so that silt generated during excavation is blocked outside the installation groove, and the openable sliding groove is designed, so that the baffle plate can be easily installed, and meanwhile, the worn cutter head can be conveniently replaced.

Drawings

Fig. 1 is a schematic structural view of the whole anti-winding cutter head device.

FIG. 2 is a schematic view of the cutting knife unit and the connection with the movable plate unit.

Fig. 3 is a schematic view of the interior of the tank unit according to the present invention.

Fig. 4 is a schematic view showing a structure in which the sliding plate is installed in the sliding groove in the present invention.

Fig. 5 is a schematic structural view of a connection mode of the cover plate and the hinge in the invention.

Fig. 6 is a schematic structural view of the installation position of the locking plate in the present invention.

FIG. 7 is a schematic structural view of a movable plate mounted in a position-limiting groove according to the present invention.

FIG. 8 is a schematic structural view of the arrangement of the cutter head of the pipe pushing jack of the anti-wind cutter head device of the present invention.

Detailed Description

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, an anti-winding cutter head device for a cutter head of a micro-shield push bench comprises a cutter unit 1, a groove body unit 3 arranged on a cutter body groove preset on the cutter head A of the push bench and used for mounting the cutter unit 1, and a movable plate unit 2 arranged on the groove body unit 3 and used for improving the cutting capacity of sundries in a reciprocating manner of driving the cutter unit 1.

In this embodiment, the pipe pushing jack cutter head a is connected to the power device of the pipe pushing jack, for example, the hydraulic power device, provides the force and the rotating force of jacking forward for the pipe pushing jack cutter head a, the cell unit 3 is arranged on the reserved mounting groove of the pipe pushing jack cutter head a, the pipe pushing jack cutter head a uses the circle center as the symmetrical point to set up a plurality of reserved mounting grooves for installing the cell unit 3, the cell unit 3 is provided with a built-in sliding groove, the cutter unit 1 is installed on the built-in sliding groove of the cell unit 3, and drives the cutter unit 1 to reciprocate along the long side direction of the groove of the cell unit 3 through the movable plate unit 2 which is arranged on the bottom surface of the cell unit 3, so that the cutter unit 1 can also reciprocate by itself when the pipe pushing jack cutter head a rotates to drive the cutter unit 1 to rotate, and can effectively cut and smash some plastic fibers buried underground, the plastic fibers are prevented from being wound on the cutter head A of the push bench.

In addition, in the prior art, cutter body grooves are generally reserved in the cutter head A of the push bench for installation of the groove body unit 3, and the groove body unit 3 can be fixed in the cutter body grooves in a threaded connection fixing mode or other fixing modes.

In addition, the movable plate unit 2 is a plate with a middle notch, and the notch can be used for installing the cutting knife unit 1 and is fixed by screw connection or welding.

The cutter unit 1 includes a shank portion 101 provided on the movable plate unit 2, and a bit portion 102 provided on the shank portion 101.

In this embodiment, the lower portion of the handle portion 101 is pre-installed with an installation groove on the movable plate unit 2, so as to be firmly fixed on the movable plate unit 2 and to be movably installed, and thus, if the cutting unit 1 is worn after a long time operation, it cannot be replaced in time.

In addition, cutter head portion 102 wholly is the cockscomb structure, sets up on the top surface of cutter handle portion 101, works as fly leaf unit 2 drives when cutter handle portion 101 removes, cutter head portion 102 removes about thereupon, forms the action of similar electric saw, can effectively saw off, smash the fibrous obstacle under the earth's surface, avoids fibrous obstacle winding pipe jacking machine blade disc A, in some use scenes, for example when getting through the pipeline of the plastics drain bar under the highway road bed, it is fine to avoiding the plastic fiber in the plastics drain bar to form winding effect to pipe jacking machine blade disc A.

The tool bit portion 102 includes a long tool bit 102a disposed on the tool shank portion 101, two short tool bits 102b disposed on the tool shank portion 101 and located on the left and right sides of the long tool bit 102a, and a curved tool bit 102c disposed on the tool shank portion 101 and located on a side of the short tool bit 102b different from the long tool bit 102 a.

In this embodiment, the tops of the three different cutter heads, namely the long cutter head 102a, the short cutter head 102b and the cambered surface cutter head 102c, form an ellipse, the design can be in smooth contact with soil when the push bench cutter head A rotates, the soil excavation effect can be realized more efficiently, and a saw-tooth-shaped gap is formed between the three cutter heads.

The tool head 102 further includes serrated grooves 102d formed in the long tool tip 102a, the short tool tip 102b, and the curved tool tip 102 c.

In this embodiment, the long tool bit 102a and the short tool bit 102b are both of a trapezoid-like structure, both sides of the long tool bit 102a and the short tool bit 102b are provided with inclined planes, the sawtooth grooves 102d are arranged on the inclined planes, and the fibrous obstacle is clamped in a gap between the long tool bit 102a and the short tool bit 102b after being primarily ground, and at this time, the fibrous obstacle moves along the inclined planes as the tool bit 102 moves left and right, so that the fibrous obstacle is sawn into short and small fibers by the sawtooth grooves 102d arranged in a linear array along the inclined planes, and thus the possibility that the cutterhead a of the push bench is wound is greatly reduced.

In addition, the outer side surface of the arc-shaped cutter head 102c is arc-shaped, the sawtooth groove 102d is not arranged, and the inclined surface of the inner side surface is provided with the sawtooth groove 102d, so that the fibrous obstacle slides into the groove formed by the inner side and the short cutter head 102b through the arc-shaped inclined surface of the outer side surface, and the fibrous obstacle is clamped in the groove, thereby facilitating the subsequent sawing of the fiber.

The tool shank 101 comprises a tool shank block 101a for mounting the long tool bit 102a, the short tool bit 102b and the cambered tool bit 102c, a tool shank mounting groove 101b arranged on the bottom surface of the tool shank block 101a for mounting the movable plate unit 2, and a tool shank screw hole 101c arranged on the bottom surface of the tool shank block 101 a; the movable plate unit 2 comprises a fixing column 201 arranged on the handle mounting groove 101b, a fixing ring 202 arranged on the annular surface of the fixing column 201, a fixing ring screw hole 203 arranged on the fixing ring 202 and used for being connected with the handle screw hole 101c, and a fixing ring bolt 204 used for being screwed with the handle screw hole 101c and the fixing ring screw hole 203.

In this embodiment, the fixing column 201 is a cylinder, the area of the top surface of the fixing column is similar to the area of the circular slotted opening of the handle mounting groove 101b, and the fixing action of the movable plate unit 2 on the cutting knife unit 1 can be just inserted into the handle mounting groove 101b, and the fixing action of the movable plate unit 2 on the cutting knife unit 1 is achieved, and meanwhile, the fixing action and the replacement action of the cutting knife unit 1 are achieved by adopting a threaded connection mode, so that the installation and the replacement of the cutting knife unit 1 are facilitated.

The tool shank portion 101 further includes a shielding plate 101d provided on the tool shank block 101a for shielding earth splashed during excavation; the groove body unit 3 comprises an installation groove body 301 used for installing the cutting knife unit 1 and the movable plate unit 2, an accommodating groove 302 arranged on the side surface of the installation groove body 301 and used for installing the shielding plate 101d, and a rolling column 303 arranged on the side surface of the accommodating groove 302 and attached to the shielding plate 101 d.

In this embodiment, there is some earth entering among the tunnelling process in the cell body unit 3, can be to placing in the damage is caused to movable plate unit 2 among the cell body unit 3, so set up on the handle of a knife piece 101a shielding plate 101d, and installation cell body 301 both sides have set up respectively the holding tank 302 is used for the installation shielding plate 101d prevents that earth from getting into among the cell body unit 3, the mounting hole has been reserved to department in the middle of shielding plate 101d, is used for making handle of a knife piece 101a passes shielding plate 101d installs above that, the cell body unit 3 left and right sides has set up in advance holding tank 302 is used for the installation shielding plate 101d makes it can follow handle of a removes about.

In addition, in order to avoid that the holding tank 302 also enters soil, two rolling columns 303 are rotatably arranged at the opening of the holding tank 302, the rolling columns 303 are installed in an arc-shaped groove on the inner side surface of the holding tank 302, and the rolling columns 303 can rotate in the arc-shaped groove and are attached to the shielding plate 101d, so that on one hand, the whole tightness of the holding tank 302 is realized, and on the other hand, the shielding plate 101d is assisted to fix the shielding plate 101d and enable the shielding plate 101d to move left and right smoothly.

In addition, the length of the shielding plate 101d is slightly longer than the length of the opening of the installation groove body 301, and one end of the shielding plate 101d is inserted into the accommodating groove 302 during installation, so that the other end of the shielding plate 101d can smoothly enter the installation groove body 301 and is installed in the opposite accommodating groove 302.

The handle portion 101 further includes a slide plate 101e provided on a side surface of the shutter 101 d; the tank body unit 3 further includes a slide groove 304 provided on a side surface of the installation tank body 301 for installing the slide plate 101e, and a spring 305 provided on a side surface of the accommodation groove 302 for lifting up a side surface of the shielding plate 101 d.

In this embodiment, there is still a certain gap between the shielding plate 101d and the side surface of the installation tank 301, so that silt can easily enter the installation tank 301, and therefore, the sliding plate 101e is disposed on the side surface of the shielding plate 101d, and is clamped in the sliding groove 304, so that the installation tank 301 is further sealed.

In addition, a part of the sliding groove 304 communicates with the receiving groove 302, so that the sliding plate 101e can well block a gap at the connection between the sliding groove 304 and the receiving groove 302.

In addition, the shielding plate 101d is easy to collide with the side surface of the accommodating groove 302 during the left-right movement, so the spring 305 is provided to play a role of buffering, and the shielding plate does not collide with the side surface of the accommodating groove 302 when the movement amplitude is too large, and the sliding plate 101e also does not collide with the inner side surface of the sliding groove 304.

The tank unit 3 further includes a cover 306 disposed on the sliding groove 304, a hinge 307 disposed on the cover 306 and the top surface of the installation tank 301, and a locking plate 308 disposed on the cover 306 and used for connecting the top surface of the installation tank 301.

In this embodiment, the width of the shielding plate 101d and the sliding plate 101e is greater than the opening width of the installation slot body 301, and the shielding plate and the sliding plate cannot be directly installed, so the cover plate 306 is freely opened and closed and is movably connected with the top surface of the installation slot body 301 through the hinge 307, and the cover plate 306 is opened and the sliding plate 101e is placed in the sliding slot 304 during installation.

The movable plate unit 2 includes a fixed column 201 disposed in the shank installation groove 101b, a movable plate 205 disposed on a bottom surface of the fixed column 201, a pushing column 206 disposed on a side surface of the movable plate 205, and a cylinder 207 disposed on a side surface of the installation groove body 301 and configured to push the pushing column 206.

In this embodiment, the air cylinder 207 is connected with a power supply and a control system arranged on a cutter head (a) of the pipe pushing jack through a wire to control the jacking and contraction behaviors, the air cylinder 207 is respectively arranged on the left side and the right side of the installation groove body 301, the movable plate 205 is moved left and right through alternative pushing, and the movable plate is transmitted to the cutter handle portion 101 through the fixed column 201 to be moved left and right.

The tank unit 3 further includes a limit groove 309 disposed on an inner bottom surface of the installation tank 301 and used for installing the movable plate 205.

In this embodiment, the movable plate 205 is prone to rotation dislocation in the process of moving left and right, so that the two cylinders 207 are not uniformly stressed to cause the locking or breaking of the pushing post 206, and the limiting groove 309 is disposed on the inner bottom surface of the mounting groove 301, so that the movable plate 205 moves linearly, and the sliding groove 304 and the accommodating groove 302 together fix the cutting knife unit 1, thereby making the cutting process more stable.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the present invention.