JP2018126845A - Boring system and remote boring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring system and a remote boring system which can appropriately eject a core even when a direction of a hole saw is a direction other than a vertically downward direction.SOLUTION: A remote boring system 1 has a hole saw 32 which forms a through hole 100 in a closing plate 5, and a push-out mechanism 62 which puts out, from the inside of the hole saw 32, a core C2 cut out from the closing plate 5 in forming the through hole 100.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a punching device and a remote punching device.

  Patent Document 1 listed below discloses a remote drilling device that enables a drilling operation by remote control. This remote drilling apparatus performs drilling work on a stop plate of a penetration in place of an operator in a high-dose environment in a reactor building where a severe accident has occurred. If a penetration hole is made in the penetration closing plate, the boundary that has been secured so far will be destroyed once, so it is necessary to construct a temporary boundary.

  For this reason, the remote drilling device is attached to the wall portion via a short tube, an extension shaft on which a drill is mounted at the tip, a drilling device main body that can be moved forward and backward by remote operation and to which the extension shaft is attached and detached. A valve spool; a purge line that supplies nitrogen gas into the short pipe; and a seal portion that is fixed to the valve spool and into which the extension shaft can be inserted.

  Then, with the nitrogen gas being supplied from the purge line, the valve spool is hermetically sealed by inserting the extension shaft into the seal portion, and the boundary in the valve spool is secured, so the boundary is secured. However, the through-hole can be drilled, and even if a high-dose substance exists inside the perforation due to a severe accident or the like, the drilling operation can be performed without releasing the high-dose substance to the outside. An excellent effect can be exhibited.

Japanese Patent Laid-Open No. 2006-79571

  By the way, it is preferable to form a through hole of a certain size in the closing plate when the inside of the penetration is investigated after the through hole is formed in the closing plate. In such a case, a hole saw is more suitable than a drill as the rotary blade mounted on the drilling device. However, if the closing plate is perforated with a hole saw, a disc-shaped core may be cut out from the closing plate, and the core may fall (fall) to the hole saw side. In other words, the hole saw normally forms a through hole vertically downward with respect to the drilled object, and the drop destination of the core is not a problem. For example, as described above, it penetrates in the horizontal direction with respect to the penetration plate. When forming a hole or the like, there is a problem that the core may fall (fall) to either the hole saw side or the penetration side.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drilling device and a remote drilling device that can appropriately eject the core even if the orientation of the hole saw is other than vertically downward.

  In order to solve the above problems, the present invention provides a hole saw for forming a through hole in a drilling object and an extrusion for extruding a core cut out from the drilling object when the through hole is formed from the inside of the hole saw. A perforating apparatus having a mechanism is employed.

  Moreover, in this invention, the said hole saw employ | adopts the structure that a through-hole is formed in a horizontal direction with respect to the said drilling target object.

  Further, in the present invention, it has a hollow shaft that supports the hole saw, the extrusion mechanism passes through the inside of the hollow shaft, inside the hole saw, the shaft that contacts the surface of the drilling object, And a biasing member that biases the shaft toward the surface of the drilling object.

  Moreover, in this invention, when the said hole saw forms the through-hole in the said drilling target object, the structure that the said shaft is contacting the surface of the said punching target object in an accumulating state is employ | adopted.

  Further, in the present invention, a remote drilling device having a movable carriage and the above-described drilling device mounted on the movable carriage is adopted.

According to the present invention, when the through hole is formed in the drilling target by the hole saw, the core saw cut out from the drilling target is provided with an extrusion mechanism that pushes out the inner side of the hole saw. Even if it exists, a core can be discharged | emitted appropriately and a drilling operation can be performed reliably and safely.
Thus, in the present invention, the core can be properly discharged even if the hole saw is in a direction other than the vertically downward direction.

It is side sectional drawing which shows the remote perforation apparatus in embodiment of this invention. It is a schematic diagram which shows the principal part of the remote punching apparatus in embodiment of this invention. It is a schematic diagram which shows the principal part of the remote perforation apparatus in embodiment of this invention, Comprising: It is a figure which shows a mode when the through-hole is formed in the closing plate.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are described by way of example in order to better understand the gist of the invention, and do not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, the main part may be enlarged for convenience, and the dimensional ratios of the respective components are the same as the actual ones. Not necessarily. In addition, in order to make the features of the present invention easier to understand, some parts are omitted for convenience.

FIG. 1 is a side sectional view showing a remote punching device 1 according to an embodiment of the present invention.
The remote drilling device 1 of the present embodiment travels on the floor 2 in the reactor building by remote control and closes the plate 4 (pipe portion) provided on the wall 3 (the drilling target). Drilling work to form a through hole in the object). The remote drilling device 1 includes a movable carriage 10, an isolation device 20, a drilling device 30, a suspension device 40, and a clamp device 50.
In the following description, the front / rear, left / right, and up / down directions will be defined with reference to the traveling direction of the mobile carriage 10. That is, the traveling direction of the moving carriage 10 is the front-rear direction, the direction in which the moving carriage 10 is directed to the penetration 4 is the front, and the direction in which the moving carriage 10 moves away is the rear. A horizontal direction orthogonal to the front-rear direction is defined as the left-right direction, and a vertical direction orthogonal to the front-rear direction and the left-right direction is defined as the up-down direction.

  The moving carriage 10 is configured by connecting a front carriage 11 and a rear carriage 12. An isolation device 20 and a clamp device 50 are supported on the front carriage 11. A suspension device 40 is supported on the rear carriage 12. The punching device 30 is connected to the isolation device 20 and supported by being suspended by the suspension device 40, and is supported across the front carriage 11 and the rear carriage 12.

  A connecting member 13 protrudes behind the front carriage 11. The connecting member 13 is formed with a through-hole penetrating in the vertical direction, so that the rod portion of the air cylinder 14 provided in front of the rear carriage 12 can be inserted. A fixed caster 15 that cannot turn is provided on the front carriage 11 (in front of the movable carriage 10). On the other hand, a free caster 16 capable of turning is provided on the rear carriage 12 (rear of the movable carriage 10).

  The mobile carriage 10 includes a traveling unit 17 and includes a traveling air motor 17a and a turning air motor 17b as driving sources. The traveling air motor 17a rotates the two wheels of the traveling unit 17 in the same direction to cause the moving carriage 10 to travel. Further, the turning air motor 17b turns the mobile carriage 10 by rotating the two wheels of the traveling unit 17 in the opposite directions. The traveling unit 17 is provided on the rear carriage 12 (rear of the movable carriage 10). Specifically, the traveling unit 17 is provided behind the fixed caster 15 and in front of the free caster 16. As described above, the mobile carriage 10 according to the present embodiment controls the rotation of the traveling air motor 17a and the turning air motor 17b of the traveling unit 17, so that the rear of the moving carriage 10 starts from the front of the movable carriage 10. It is a rear wheel drive system that can swing left and right.

  The rear carriage 12 is equipped with a control unit 18 that can communicate with an external control device. Note that the communication method may be wired or wireless. The control unit 18 controls the operation of each component device of the remote punching device 1. Further, the rear carriage 12 is equipped with an air compressor (not shown) for supplying air to the air cylinder 14, the traveling air motor 17a, the turning air motor 17b, and other air driving devices described later.

  The isolation device 20 is mounted on the front carriage 11 of the movable carriage 10. The isolation device 20 constructs a temporary boundary when a through hole is made in the closing plate 5 of the penetration 4. In other words, the isolation device 20 is in airtight contact with the surface 5a of the closing plate 5 and prevents the gas containing the high-dose substance existing inside the penetration 4 from being discharged outside. The isolation device 20 includes a front chamber 21 (spool), a remote control valve 22, and a rear chamber 23.

  The front chamber 21 has an opening flange 21 a that is in airtight contact with the surface 5 a of the closing plate 5. A sealing member that improves airtightness is provided on the contact surface of the opening flange 21a that contacts the surface 5a of the closing plate 5. The remote control valve 22 is connected to the rear of the front chamber 21 and its internal space communicates with the inside of the front chamber 21. The remote control valve 22 is, for example, an electric ball valve that opens and closes under the control of the control unit 18. The remote control valve 22 may be an electric valve or an electromagnetic valve.

  The rear chamber 23 is connected to the rear of the remote control valve 22, and its internal space communicates with the interior of the remote control valve 22. The front chamber 21, the remote control valve 22, and the rear chamber 23 are connected in a horizontal direction so that a main body 31 of a punching device 30 to be described later can be inserted in the horizontal direction (the front-rear direction of the movable carriage 10). The rear chamber 23 has a centering part (protrusion part) for centering the main body part 31 of the punching device 30 inserted in the isolating device 20.

  The front chamber 21 and the remote control valve 22 are connected to each other before and after the shield 24. The front chamber 21 is disposed in front of the shield 24, and the remote control valve 22 is disposed behind the shield 24. The front carriage 11 (in front of the movable carriage 10) has a bottom shield 25 disposed below the remote control valve 22 (and the rear chamber 23) and a ceiling disposed above the remote control valve 22. A part shield 26 and side shields (not shown) arranged on the left and right of the remote control valve 22 are provided.

  A front frame 24a extending forward and a rear frame 24b extending rearward are connected to the shield 24, and each frame is provided with a height adjusting device 27 provided on the front carriage 11 (in front of the movable carriage 10). Is supported by. The height adjusting device 27 has a plurality of jack bolts 28. The jack bolt 28 has an air motor as a drive source, and the worm mechanism (not shown) is driven by the air motor to move the isolator 20 up and down via the shield 24.

  The punching device 30 is connected to the isolating device 20 in a cantilevered state. The punching device 30 includes a main body 31, a hole saw 32, a moving device 33, and a connecting device 34. The connecting device 34 includes a connecting tube 34a, a toggle clamp 34b, and an air cylinder 34c. The connecting pipe 34 a is connected to the rear of the rear chamber 23, and its internal space communicates with the interior of the rear chamber 23. A seal portion 34a1 into which the main body portion 31 can be inserted is provided at the rear end portion of the connection pipe 34a, and a boundary (airtight space) inside the isolation device 20 and the connection pipe 34a is secured.

  A plurality of toggle clamps 34b are provided on the outer periphery of the connection pipe 34a, and the connection pipe 34a and the rear chamber 23 are connected by sandwiching the flange at the front end of the connection pipe 34a and the flange at the rear end of the rear chamber 23. Is. The air cylinder 34c is provided so as to face the handle portion of the toggle clamp 34b. By pushing the handle portion of the toggle clamp 34b with the rod portion, the connection state with the isolation device 20 can be released by remote operation. It is something to be made.

  The main body 31 has an elongated shape that extends at least longer than the isolation device 20, and a hole saw 32 is disposed at the tip thereof. That is, the main body 31 has a length that allows the front end (hole saw 32) to access the closing plate 5 through the inside of the isolation device 20. The hole saw 32 of the present embodiment is configured to rotate around the central axis of the main body 31 by a motor (not shown).

  The moving device 33 moves the main body 31 relative to the separating device 20 in the front-rear direction. The moving device 33 has a guide rod 33a connected to the connecting pipe 34a. A slider 33b connected to the rear end of the main body 31 is engaged with the guide rod 33a. A plurality of the guide rods 33a are arranged around the main body 31 and their rear ends are connected to the support plate 33e.

  The moving device 33 is configured to move the main body 31 by a ball screw mechanism, and includes a screw shaft 33c and a nut 33d. The screw shaft 33c has a front end portion rotatably supported by the connecting pipe 34a and a rear end portion rotatably supported by the support plate 33e. The nut 33d is engaged with the screw shaft 33c so as to be relatively rotatable, and is connected to a rear end portion of the main body portion 31. The screw shaft 33c is connected to a motor (not shown) and is configured to move the main body 31 in the front-rear direction by rotating relative to the nut 33d.

  The suspending device 40 suspends and supports the piercing device 30 while offsetting the weight of the piercing device 30 connected to the isolating device 20 in a cantilevered state. The suspension device 40 of the present embodiment is a wire take-up balancer that cancels the weight of an article suspended from the lower end of the wire 41. The suspension device 40 is configured to make the weight of the suspended article close to zero by using the tension of a spring (spring) provided therein, and to be operated up and down with a light force. It is configured to be balanced by height.

  The suspension device 40 is suspended upside down on the rear carriage 12 via a hook wire 42. Two suspension devices 40 are provided and support the front and rear of the main body 31. Specifically, a suspension bar 44 is installed between the rear end upper portion of the connecting pipe 34 a and the upper portion of the support plate 33 e, and two suspension pieces 43 are attached to the suspension bar 44. Each of the suspension pieces 43 is connected to a wire 41 of a separate suspension device 40 via a pulley 45.

  The clamp device 50 grips the flange portion of the penetration 4 to which the closing plate 5 is attached, and is provided in front of the remote drilling device 1. The clamp device 50 includes a link mechanism 51, a wheel portion 52, and a pressing mechanism 53. The link mechanism 51 is configured to be developed on the back side of the flange portion of the penetration 4 by driving an air cylinder (not shown). The wheel portion 52 is provided in the link mechanism 51 and abuts on the penetration 4. The pressing mechanism 53 presses the opening flange 21 a of the front chamber 21 of the isolation device 20 against the closing plate 5 in a state where the link mechanism 51 is deployed on the back side of the flange portion of the penetration 4.

  The drilling operation by the remote drilling device 1 having the above configuration is performed roughly as follows by remote operation from an external control device. First, the traveling unit 17 is driven to bring the remote punching device 1 closer to the penetration 4. Next, the height adjusting device 27 is driven, and the height is adjusted so that the opening flange 21 a of the separating device 20 contacts the specified height of the closing plate 5. Next, after the link mechanism 51 of the clamp device 50 is deployed, the pressing mechanism 53 is driven to press the opening flange 21 a whose height is adjusted against the surface 5 a of the closing plate 5.

  Thereafter, the remote control valve 22 is opened and the moving device 33 is driven to insert the main body 31 of the punching device 30 into the isolation device 20. Next, the rotary blade 32 provided at the tip of the main body 31 is rotated to access the closing plate 5 via the front chamber 21, and a through hole is formed in the closing plate 5. When the through hole is formed in the closing plate 5, the moving device 33 is driven to retract the main body 31 and close the remote control valve 22.

  Thereafter, in order to disengage the drilling device 30 that has finished the work, the air cylinder 34c of the connecting device 34 is driven, the handle portion of the toggle clamp 34b is pushed in, and the connection between the separating device 20 and the punching device 30 is released. Further, to release the connection between the front carriage 11 and the rear carriage 12, the air cylinder 14 is driven and the rod portion is pulled out from the connection member 13. Thereafter, the traveling unit 17 is driven, and the punching device 30 is detached together with the rear carriage 12.

  When the piercing device 30 is detached, for example, an investigation device that investigates the inside of the penetration 4 or a removal device that removes deposits inside the penetration 4 is connected to the remaining isolation device 20 (and the shield 24). Thus, a predetermined operation can be performed inside the penetration 4 while ensuring the boundary.

FIG. 2 is a schematic diagram showing a main part of the remote punching device 1 according to the embodiment of the present invention.
As shown in FIG. 2, the remote drilling device 1 (punching device 30) includes a hole saw 32, a hollow shaft 60, a gas supply device 61, and an extrusion mechanism 62. The hollow shaft 60 supports the hole saw 32 at one end thereof. The hollow shaft 60 is supported inside the main body 31 (see FIG. 1) via a bearing (not shown). A gas supply device 61 is connected to the other end of the hollow shaft 60 as shown in FIG.

  The gas supply device 61 supplies the gas G to the inside of the hole saw 32 through the hollow shaft 60. The gas supply device 61 includes, for example, a gas tank and an opening / closing valve, and is configured to supply the gas G from the gas tank by opening the opening / closing valve. The gas G supplied by the gas supply device 61 may be air, but is preferably an inert gas, more preferably nitrogen gas. As the gas supply device 61, an air compressor (not shown) that supplies air to the above-described air driving device may be used (also used).

  As described above, the hole saw 32 is surrounded by the isolation device 20 (chamber) including the front chamber 21, the remote control valve 22, and the rear chamber 23. The opening flange 21 a of the separating device 20 is in contact with the surface 5 a of the closing plate 5. 2 is a seal member provided on the opening flange 21a, and the isolation device 20 forms an airtight space surrounding the hole saw 32.

  At the upper part of the front chamber 21, a mechanical safety valve 70 capable of setting a relief pressure is provided. The safety valve 70 is configured to release the internal pressure of the isolation device 20 when the internal pressure of the isolation device 20 is increased to a set pressure or higher. That is, the safety valve 70 stops the flow of the gas G from the space S1 inside the hole saw 32 to the space S2 outside the hole saw 32 (inside the isolation device 20) when the purge pressure by the gas supply device 61 is balanced. Therefore, the flow of the gas G from the space S1 to the space S2 is formed while maintaining the pressure of the space S2 by opening the valve at a set pressure or higher.

  The safety valve 70 is configured to keep the internal pressure of the isolation device 20 higher than the pressure of the space S3 that communicates when the through hole is formed in the closing plate 5. That is, the safety valve 70 maintains a state in which the pressure in the space S2 inside the isolation device 20 (front chamber 21) is higher than the pressure in the space S3 inside the penetration 4, so that the safety valve 70 moves from the space S3 inside the penetration 4. The flow (outflow) of gas to the space S2 inside the isolation device 20 is suppressed.

  That is, the safety valve 70 operates such that the pressure satisfies the space S1> space S2> space S3. For example, when the pressure in the space S1 (gas supply pressure) is 20 kPa (kilopascal) and the pressure in the space S3 (internal pressure in the penetration 4) is 5 kPa, the safety valve 70 is connected to the pressure in the space S2 (inside the isolation device 20). The valve is opened when the pressure is 10 kPa (specified value).

  Further, a chip dust collecting portion 71 is provided at the lower portion of the front chamber 21. The chip dust collecting portion 71 is formed in a throat shape that gradually becomes narrower downward, and a bottom lid 72 is attached to the lower end thereof. By opening the bottom lid 72, the chips C1 accumulated on the chip dust collecting portion 71 of the front chamber 21 can be easily recovered.

FIG. 3 is a schematic diagram showing a main part of the remote perforation apparatus 1 according to the embodiment of the present invention, and shows a state when the through hole 100 is formed in the closing plate 5.
As shown in FIG. 3, the push-out mechanism 62 pushes out the core C <b> 2 cut out from the closing plate 5 when the hole saw 32 forms the through hole 100 from the inside of the hole saw 32. That is, since the hole saw 32 forms the through-hole 100 in the horizontal direction with respect to the closing plate 5, if the extrusion mechanism 62 is not provided, the cut core C <b> 2 is inside the hole saw 32 or the penetration 4. This is because it can fall (fall) into any of the internal spaces S3.

  The extrusion mechanism 62 includes a shaft 63 and a biasing member 64. The shaft 63 passes through the inside of the hollow shaft 60, and one end of the shaft 63 contacts the surface 5 a of the closing plate 5 inside the hole saw 32. The shaft 63 may be a solid shaft or a hollow shaft. In addition, a disc is connected to the end of the shaft 63, but it may be a simple rod. A biasing member 64 is connected to the other end of the shaft 63.

  The urging member 64 urges the shaft 63 toward the surface 5 a of the closing plate 5, and is interposed between the shaft 63 and the main body 31, for example. The biasing member 64 of the present embodiment is formed from a spring member such as a spring. The urging member 64 may be any member that can exert an elastic force as a restoring force, and may be, for example, a rubber member.

  As shown in FIG. 2, when the hole saw 32 forms a through hole in the closing plate 5, the shaft 63 is in contact with the surface 5 a of the closing plate 5 in a stored state. That is, the shaft 63 is pressing the closing plate 5, and the hole saw 32 forms a through hole in the closing plate 5 in this state. In order to form such a state, for example, as shown in FIG. 3, when the urging member 64 has a natural length (when the core C2 is pushed out), the tip (one end) of the shaft 63 is You may employ | adopt the structure which protrudes ahead rather than the blade edge | tip of the hole saw 32. FIG.

  According to the remote punching device 1 having the above configuration, as shown in FIG. 3, when the through hole 100 is formed in the closing plate 5 by the hole saw 32, the core C <b> 2 cut out from the closing plate 5 is removed from the inside of the hole saw 32. Since the extrusion mechanism for extruding is provided, even if the orientation of the hole saw 32 is other than vertically downward (for example, in the horizontal direction as in the present embodiment), the core C2 does not fall to the hole saw 32 side, and the penetration 4 is ensured. The core C2 can be dropped to the side. In addition, by this, for example, the punching device 30 can be removed without bringing back the contaminated core C2, which leads to a reduction in exposure. Thus, according to this embodiment, even if the direction of the hole saw 32 is other than vertically downward, the core C2 can be appropriately discharged, and the drilling operation can be performed reliably and safely.

  Further, in the present embodiment, the hollow shaft 60 that supports the hole saw 32 is provided, and the extrusion mechanism 62 passes through the hollow shaft 60 and contacts the surface 5 a of the closing plate 5 inside the hole saw 32. And a biasing member 64 that biases the shaft 63 toward the surface 5 a of the closing plate 5. According to this configuration, the biasing force of the biasing member 64 biases the surface 5a of the closing plate 5 from the inside of the hole saw 32 via the shaft 63, and the core C2 can be discharged. Further, according to this configuration, since the core C2 can be discharged with a mechanical configuration, a driving source is not necessary. For example, as compared with a case where the extrusion mechanism 62 is configured by an air driving device (such as an air cylinder), Air consumption and the weight of the device can be reduced.

  Further, in the present embodiment, as shown in FIG. 2, when the hole saw 32 forms a through hole in the closing plate 5, the shaft 63 is in contact with the surface 5a of the closing plate 5 in a stored state. Therefore, as shown in FIG. 3, the core C <b> 2 cut out from the closing plate 5 can be reliably dropped to the penetration 4 side at the same time as the through hole 100 is formed. Moreover, according to this structure, since the core C2 thinly connected with the closing plate 5 can be pushed in immediately before the through hole 100 is formed, the last thin wall can be easily cut off. Separation from the core C2 can be performed smoothly.

  Thus, according to the above-described embodiment, the hole saw 32 that forms the through-hole 100 in the closing plate 5 and the core C2 that is cut out from the closing plate 5 when the through-hole 100 is formed from the inside of the hole saw 32. By adopting the configuration of having an extruding mechanism 62 for extruding, the core can be properly discharged even if the orientation of the hole saw 32 is other than vertically downward, and a reliable and safe drilling operation can be performed. it can.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the configuration in which the hole saw 32 forms the through hole 100 in the horizontal direction with respect to the closing plate 5 is illustrated, but the orientation of the hole saw 32 is not limited to the horizontal direction.

  Further, for example, in the above embodiment, the remote punching device 1 in which the punching device 30 is mounted on the movable carriage 10 is illustrated, but the present invention may be applied to a stationary punching device.

  For example, in the said embodiment, although the closing plate 5 of the penetration 4 was illustrated as a drilling target object, it cannot be overemphasized that the drilling target object of this invention is not restricted to this closing plate 5. FIG.

1 Remote drilling device (Punching device)
5 Closure plate (object to be drilled)
5a Surface 10 Moving carriage 32 Hole saw 60 Hollow shaft 62 Extrusion mechanism 63 Shaft 64 Energizing member 100 Through hole C2 Core

Claims (5)

A hole saw that forms a through hole in a drilling object;
A drilling device comprising: an extrusion mechanism that pushes out a core cut out from the drilling object when the through-hole is formed from the inside of the hole saw.   The drilling device according to claim 1, wherein the hole saw forms a through hole in a horizontal direction with respect to the drilling object. A hollow shaft supporting the hole saw;
The extrusion mechanism is
A shaft that passes through the interior of the hollow shaft and contacts the surface of the object to be drilled inside the hole saw;
The piercing device according to claim 1, further comprising an urging member that urges the shaft toward the surface of the piercing object. When the hole saw forms a through hole in the drilling object,
The drilling device according to claim 3, wherein the shaft is in contact with the surface of the drilling object in a stored state. A mobile trolley,
A remote drilling device comprising: the drilling device according to any one of claims 1 to 4 mounted on the movable carriage.

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