KR100607063B1 - Cutting device of using heavy equipment - Google Patents

Abstract

After detaching the bucket from the excavator, a quick coupler equipped with a cutting device (a circular diamond saw blade (hereinafter referred to as "saw blade") that uses the working pressure of the excavator as a power source) is detachably mounted. By improving workability, the excavator can move automatically or manually by changing the cutting direction of the cutting device without moving according to the shape or working position of the cutting object or cutting object.

Cutting device using heavy equipment according to the present invention, the quick coupler is detachably mounted to the tip of the working device of the excavator,

A fixing plate mounted on the rear side of the quick coupler and having a boss formed on the outer side thereof;

A column in which one end is tiltably connected to the boss and a hydraulic motor driven by the operating pressure of the excavator is mounted at the other end,

A cutting device comprising a circular saw blade axially fixed to a rotating shaft of a hydraulic motor, a safety cover detachably fixed to a column and protecting the saw blade;

It is installed in the safety cover, and the cooling water supply means for supplying the cooling water to the saw blade through the nozzle when cutting the cutting object by the saw blade.

Rock, Cutting Device, Quick Coupler, Diamond Saw Blade, Tilting Device, Excavator

Description

Cutting device of using heavy equipment

1 is a schematic view of a cutting device using a wire saw according to the prior art,

Figure 2 is a schematic perspective view of a cutting device using heavy equipment according to the present invention,

Figure 3 is a schematic diagram of the column tilting means in the cutting device using heavy equipment according to the present invention,

Figure 4 is a modified example of a cutting device using heavy equipment according to the present invention,

5 is a plan view of the cutting device shown in FIG.

6 is a schematic view of the means for automatically tilting the saw blade shown in FIG. 4, FIG.

Figure 7 is a first use state of the cutting device using heavy equipment according to the present invention,

8 is a second use state diagram of a cutting device using heavy equipment according to the present invention.

* Explanation of symbols used in the main part of the drawing

11; Quick coupler

12; boss

13; Fixed plate

14; Hydraulic motor

15; column

16; saw blade

17; Safety cover

18; Nozzle

19; Fastener

20; Fastening member

21; Fixed piece

22; Hinge pin

23; Stopper pin

The present invention attaches a cutting device in which a circular diamond saw blade (hereinafter referred to as a "saw blade") is rotatably fixed to a quick coupler mounted on the arm tip of an excavator, so that the building stone is poor in a working environment. The present invention relates to a cutting device using heavy equipment for cutting, or cutting a retaining wall.

In more detail, after detaching the bucket from the excavator, the quick coupler, which is equipped with the cutting device, is detachably mounted, and the workability is improved by rotating the saw blade using the operating pressure of the excavator as a power source, The present invention relates to a cutting device using heavy equipment, which allows the excavator to easily change the cutting direction without moving according to the shape or working position of the water or the cutting object.

As shown in Figure 1, the cutting device for stone and building using a wire saw according to the prior art, a synthetic resin layer (2) and a synthetic resin for forming and supporting a cylindrical cross section with polyurethane or the like outside the metal wire (1) A wire saw 4 having a metal layer 3 containing a diamond abrasive formed on the outer surface of the layer 2 at a constant interval, and

The saw 4 penetrates the saw 4 through the hole 6 formed in the upper and lower sides of the rock 5, and binds both ends of the saw 4 in a closed loop shape, but is supported by the tension side and the loose side rollers 7 and 8. Rotating (4) is provided with a power transmission device for cutting the stone or building, etc., and forward and backward along the guide rail (9).

In the cutting device using the wire saw of the prior art, it is difficult to always properly maintain and manage the tension of the saw 4 passing through the tension side roller 7 described above, and the holes 6 in the rock 5 ), The work process for installing the wire saw 4 in the hole 6, and the work process for cutting the rock 5 with the saw 4, so that the work at the time of cutting the rock 5 The process is increased, the work efficiency is lowered, there is a problem that the labor cost is required to assist the assistant to install the saw (4).

In addition, it is difficult to transport and install the guide rails 9 for conveying the aforementioned power transmission device 10 in the front and rear directions, such as in an uneven mountainous region having a poor working environment, and also to transport the cutting device to the stone collection site. Separate transportation equipment is used to cause a cost increase.

An object of the present invention, by attaching the cutting device detachably attached to the quick coupler mounted on the arm of the excavator by rotating the saw blade using the operating pressure of the excavator as a power source, the rotational speed of the saw blade can be adjusted to workability It is to provide a cutting device using heavy equipment to improve.

Another object of the present invention, since the detachment of the bucket, quick coupler and the cutting device is made by the operator at the work site, a separate transportation equipment and auxiliary workers for transporting the cutting device is unnecessary, which increases the work cost due to the increase in labor costs It is to provide a cutting device using a heavy equipment to prevent it.

Still another object of the present invention is to adjust the cutting device to the quick coupler automatically or manually, thereby minimizing excavator movement by working without interfering with the shape or working position of the cutting object or the cutting object. It is to provide a cutting device using heavy equipment to shorten the working time and reduce operator fatigue.

An object of the present invention, the quick coupler detachably mounted to the tip of the working device of the excavator,

A fixing plate mounted on the rear side of the quick coupler and having a boss formed on the outer side thereof;

A column in which one end is tiltably connected to the boss and a hydraulic motor driven by the operating pressure of the excavator is mounted at the other end,

A cutting device comprising a circular diamond saw blade fixed to a rotating shaft of a hydraulic motor, a safety cover detachably fixed to a column and protecting the saw blade;

It is achieved by providing a cutting device using a heavy equipment, which is installed in the safety cover, and having a coolant supply means for supplying coolant to the saw blade through the nozzle when cutting the cutting object by the saw blade.

The means for tilting the cutting device with respect to the column to change the cutting direction of the saw blade described above,

One end is tiltably adjustable to the boss and two or more rows of fastening holes are radially formed on the outer surface, and a hydraulic motor is mounted on one end and fitted to the first column, and is coupled to the fastening holes to be crimped and fixed. And a second column rotatably connected to the first column by the fastening member.

Means for jointly connecting the aforementioned columns to the quick coupler with adjustable tilting,

Hinge pins that pivotally fix the fixed piece extended to the first column to the boss, and a stopper pin coupled to the fastening hole formed in the same column on the fixed piece and the fixing hole of the boss and prevent the first column from rotating. Equipped.

An object of the present invention, the quick coupler detachably mounted to the tip of the working device of the excavator,

A hydraulic motor mounted to a fixed box rotatably installed on the quick coupler and driven by an operating pressure of the excavator,

A cutting device comprising a rotating shaft connected to a shaft by a hydraulic motor, a circular saw blade fixed to a rotating gear connected to a shaft by a shaft end, and a safety cover protecting the saw blade;

It includes a tilting first hydraulic motor mounted on a fixed box fixed to the quick coupler and driven by the operating pressure of the excavator, and automatically moves the fixed box to the quick coupler without moving the excavator according to the shape and position of the cutting object. A first tilting means to rotate,

A second hydraulic motor for tilting is mounted on the outer side of the annular column coupled to the outer side of the rotating shaft and driven by the operating pressure of the excavator, and is cut against the quick coupler without moving the excavator according to the shape and working position of the cutting object. Second tilting means for automatically rotating the device,

It is achieved by providing a cutting device using a heavy equipment, which is installed in the safety cover, and having a coolant supply means for supplying coolant to the saw blade through the nozzle when cutting the cutting object by the saw blade.

The first tilting means described above,

The first hydraulic motor for tilting mounted on the fixed box, the first drive shaft connected to the first hydraulic motor with a shaft joint, and the first worm is formed on the outer surface, and the quick coupler when the first hydraulic motor is engaged with the first worm. And a first worm wheel for tilting the stationary box with respect to it.

The second tilting means described above,

A second hydraulic motor for tilting mounted to the tubular casing coupled to the outer shaft, a second driving shaft connected to the second hydraulic motor and having a second worm formed on an outer surface thereof, and a rotating shaft to be engaged with the second worm; It is formed on the outer surface of the column coupled to the outside and includes a second worm wheel for tilting the cutting device when driving the second hydraulic motor.

The first worm wheel described above,

It is integrally mounted inside the first worm wheel, accommodates the hydraulic hose for supplying the hydraulic oil to the corresponding parts of the first and second tilting means from the hydraulic tank in the inner center, and tilts the fixed box and the cutting device. It further includes a turning joint to prevent twisting.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which is intended to explain in detail enough to enable those skilled in the art to easily practice the present invention. This does not mean that the technical spirit and scope of the present invention is limited.

As shown in Figures 2 and 3, the cutting device using the heavy equipment according to the present invention, is detachably mounted by a fixing means not shown at the tip of the working device (referring to the arm 40) of the excavator Quick coupler 11 (quick coupler),

A fixing plate 13 mounted on the rear face of the quick coupler 11 and having a boss 12 formed therethrough in an up and down direction on an outer side thereof;

A column 15 having one end connected to the boss 12 so as to be tiltable, and having a hydraulic motor 14 mounted on the other end driven by an operating pressure supplied from an hydraulic tank (not shown) of the excavator,

A circular diamond saw blade 16 axially fixed to the rotating shaft 14a of the hydraulic motor 14 and a safety bracket for detachably fixed to the column 15 by a fixing bracket 17a to protect the saw blade 16. The cover 17 (partly formed to be detachable) is formed, and the cutting object (referring to a rock or a building, etc.) is cut or cut to be cut (retaining wall, concrete wall surface) by driving the hydraulic motor 14. Cutting device for cutting)

Installed in the safety cover 17, the coolant (generally water is used) discharged from the outside through the nozzle 18 when cutting the cutting object by the saw blade 16 to the saw blade 16 Cooling water supply means is provided.

At this time, the cutting direction of the saw blade 16 in the state where the heavy equipment is not moved (when the place is narrow or the working environment cannot swing the heavy equipment) depending on the shape of the cutting object or the working position of the heavy equipment. The means for tilting the cutting device against the column 15 so as to change the

A pipe-shaped first column 15a in which one end is tiltably adjustable by a hinge pin 22 coupled to the through hole of the boss 12, and two or more rows of fastening holes 19 are radially formed on the outer surface thereof. ), And the hydraulic motor 14 is mounted on one end and fitted by the first column 15a and coupled to the fastening hole 19 to be crimped and secured by the fastening member 20 (set bolt function). And a pipe-shaped second column 15b rotatably connected to one column 15a.

Further, the means for jointly connecting the above-described column 15 to the quick coupler 11 so as to be tiltable adjustable,

Hinge pin 22 for hingeably fixing the fixing piece 21 extending in the first column 15a to the through hole of the boss 12, and the fastening hole formed in the same circumference in the fixing piece 21. The stopper pin 23 is detachably coupled to the fixing hole of the boss 21a and the boss 12 and prevents the first column 15a from being rotated with respect to the quick coupler 11.

Hereinafter, with reference to the accompanying drawings an example of the use of a cutting device using heavy equipment according to the present invention will be described in detail.

As shown in FIGS. 7 and 8, when cutting a stone, a rock, or the like, or cutting a retaining wall or a concrete wall, a concrete floor, etc., the bucket (at the arm 40) of the excavator ( (Not shown) instead of replacing the circular diamond saw blade 16 to the quick coupler 11 to be replaced, by utilizing the hydraulic motor 14 driven by the operating pressure of the excavator as a power source to rotate the saw blade 16 The work to be cut is cut or cut to be cut, such as a retaining wall.

2 and 3, after removing the bucket (not shown) mounted at the tip of the excavator arm 40, the quick coupler 11 is fixed to the tip of the arm 40. Mount by means. The fixing plate 13 is in close contact with the rear surface of the quick coupler 11 and is fixed integrally by the fastening member 41.

The through hole of the boss 12 protruding from the fixing plate 13 and the through hole 21a formed in the fixing piece 21 of the first column 15 coincide with each other so as to be rotatable by the hinge pin 22. After the connection, the stopper pin (not shown) is formed in the fastening hole 21a formed at the same circumference at equal intervals on the fixing piece 21 extending in the first column 15a and the fixing hole (not shown) formed in the boss 12. By inserting 23), it is possible to prevent the column 15 from rotating relative to the quick coupler 11 when cutting the cutting object or cutting the cutting object with the saw blade 16.

Meanwhile, the second column 15b is fitted into the first column 15a as described above, and the fastening member (ie, the fastening member 19 is formed in the radial direction in two rows on the outer surface of the first column 15a). 20) (set bolt function) is screwed to secure the second column (15b), the saw blade 16 to cut the cutting object or cutting the cutting object to the first column (15a) It is possible to prevent the second column 15b from rotating.

Therefore, the circular saw blade 16 which is fixed to the rotary shaft 14a of the hydraulic motor 14 mounted on the end of the second column 15b can be rotated to cut the cutting object or cut the concrete wall surface. . In this case, the safety cover 17 fixed by the fixing bracket 17a fixed to the outer side of the second column 15b may protect the worker from various safety accidents that may occur when the saw blade 16 is rotated. Of course.

In addition, by utilizing the hydraulic motor 14 driven by the operating pressure supplied from the hydraulic tank of the excavator as a power source for rotating the saw blade 16, the operation is convenient and secures a strong rotational speed of the saw blade 16 This can improve workability.

At this time, the saw blade 16 is generated between the saw blade 16 and the cutting object by the coolant (generally used in water) supplied to the saw blade 16 through the nozzle 18 installed on the safety cover 17 when the saw blade 16 is driven. By cooling the frictional heat to be prevented, it is possible to prevent premature wear or breakage of the saw blade 16 and improve workability.

On the other hand, when cutting an object to be cut or when cutting a wall such as a retaining wall, or when the place is narrow or obstacles are placed around the work site, and the excavator is not easily driven, the saw blade may not be moved. The cutting direction or the cutting direction of 16) can be changed easily.

In detail, the above-described fastening member 20 screwed to the fastening hole 19 of the first column 15a is released to release the locking of the second column 15b with respect to the first column 15a. Thereafter, the second column 15b is rotated at a predetermined angle with respect to the first column 15a to squeeze and fix the fastening member 20 in the radial direction to lock the second column 15b with respect to the first column 15a. As a result, the cutting direction of the saw blade 16 with respect to the quick coupler 11 can be changed.

In addition, when the cutting operation on the wall using a cutting device, when the working space is not secured enough around the workplace can be operated in a state in which the excavator is inclined with respect to the cutting surface. In detail, the fastening hole 21a formed in the fixing piece 21 of the first column 15a in the circumferential direction and the stopper pin 23 coupled to the fixing hole of the boss 12 are separated from each other. After the column 15a is rotated with respect to the quick coupler 11 at a predetermined angle, the stopper pin 23 is re-engaged by matching the fastening hole 21a with the fixing hole.

Therefore, as the first column 15a is fixed to the quick coupler 11 at a predetermined angle in the left or right direction, the saw blade 16 is inclined at a predetermined angle with respect to the cutting object or the wall surface. Of course it can.

On the other hand, as shown in Figures 4 to 6, the cutting device using heavy equipment according to another embodiment of the present invention, detachable by the fixing means not shown in the tip of the working device (referring to the arm 40) of the excavator A quick coupler (11) which is mounted as possible,

A hydraulic motor 14 mounted on a fixed box 24 rotatably installed on the quick coupler 11 and driven by an operating pressure supplied from an hydraulic tank (not shown) of the excavator,

The rotating shaft 26, one end of which is connected to the hydraulic motor 14 by serration coupling, and the first bevel gear 27a and the first bevel gear 27a, which are connected to the other end of the rotary shaft 26 by serration coupling. A rotary gear 27 formed as a second bevel gear 27b to be engaged with the circular diamond blade, a circular diamond saw blade 16 detachably fixed to the rotation shaft 42 fixed to the second bevel gear 27b; It comprises a safety cover 17 (partly formed to be easily removable) to protect the saw blade 16, and a cutting device for cutting the cutting object (rock, building, etc.) by driving the hydraulic motor (14) ,

A first hydraulic motor 25 for tilting, which is mounted on a fixed box 24 fixed to the quick coupler 11 and driven by hydraulic oil supplied from a hydraulic tank (not shown) of the excavator, First tilting means for automatically rotating the fixed box 24 with respect to the quick coupler 11 without moving the excavator according to the shape and working position;

And a second hydraulic motor (29) for tilting, which is mounted on an outer surface of the annular column (28) coupled to the rotating shaft (26) and driven by hydraulic oil supplied from the hydraulic tank of the excavator. Second tilting means for automatically rotating the cutting device with respect to the quick coupler 11 without moving the excavator according to the working position;

It is provided on the safety cover 17, and is provided with a cooling water supply means for discharging the coolant supplied from the outside through the nozzle 18 to the saw blade 16 when cutting the cutting object by the saw blade (16).

The first tilting means described above,

The first hydraulic motor 25 for tilting mounted to the fixed box 24 and the first hydraulic motor 25 are connected to the shaft by a shaft, and the first worm 30 is formed on the outer surface thereof and is formed by the bearing housing B. The first drive shaft 31 is rotatably fixed to both ends, the first worm 30 is meshed with the first hydraulic motor 25 when driving the first coupler to the fixed box 24 against the quick coupler 11 when driving The worm wheel 32 is included.

The second tilting means described above,

A tilting second hydraulic motor 29 mounted on a tubular casing 33 coupled to an outer side of the rotating shaft 26 and a shaft coupling to the second hydraulic motor 29 and a second worm 34 on the outer surface thereof. The second driving shaft 35 is formed and rotatably fixed at both ends by the bearing housing B, and the outer side of the annular column 28 coupled to the outer side of the rotating shaft 26 to be engaged with the second worm 34. And a second worm wheel 37 which tilts the cutting device with respect to the quick coupler 11 when the second hydraulic motor 29 is driven.

The first worm wheel 32 described above,

It is integrally mounted inside the first worm wheel 32 and accommodates the hydraulic hose 38 for supplying hydraulic oil to the corresponding parts of the first and second tilting means from the hydraulic tank in the inner center, and the fixed box 24 and It is further provided with a turning joint 39 for tilting the cutting device to prevent twisting of the hydraulic hose 38 during operation.

Hereinafter, with reference to the accompanying drawings an example of the use of a cutting device using heavy equipment according to another embodiment of the present invention will be described in detail.

As shown in Figs. 7 and 8, after removing the bucket from the excavator working device (referring to the arm 40), the saw blade using the power of the hydraulic motor 14 driven by the hydraulic oil supplied from the excavator. Removably mounting the quick coupler 11 to which the 16 is mounted to the tip of the arm 40 to cut the cut object or to cut the cut object is substantially the same as that shown in one embodiment of the present invention. Since the same applies to, the detailed description thereof will be omitted.

Therefore, the fixed box 24 which is rotatably mounted to the quick coupler 11 according to the shape or working position of the cutting object such as the rock or the retaining wall or the like is automatically operated at a predetermined angle by operating the corresponding lever. You can change it to work.

In detail, as the operating oil is supplied from the hydraulic tank of the excavator to the tilting first hydraulic motor 25 by operating the corresponding lever or button (not shown) in the cab, the first hydraulic motor ( Since the first driving shaft 31 fixed to the shaft 25 is rotated, the first worm wheel 32 mounted on the fixed box 24 to be engaged with the first worm 30 formed on the outer surface of the first driving shaft 31 is provided. ).

Therefore, it is possible to work by rotating the fixed box 24 with respect to the quick coupler 11 at a predetermined angle.

Meanwhile, the cutting direction of the saw blade 16 with respect to the quick coupler 11 is automatically changed by operating the corresponding lever in the cab according to the shape or working position of the cutting object such as the rock or the retaining wall. Can be.

As the operating fluid is supplied from the hydraulic tank of the excavator to the tilting second hydraulic motor 29 by operating the corresponding lever or button (not shown) in the cab, the shaft is fixed to the second hydraulic motor 25. Since the second driving shaft 35 is rotated, the second worm 34 formed on the outer surface of the second driving shaft 35 and the second column formed on the outer surface of the annular column 28 coupled to the outer side of the rotating shaft 26 to engage with the second worm 34. The worm wheel 37 is driven.

Therefore, the saw blade 16 can be rotated at a predetermined angle with respect to the quick coupler 11 to work.

As described above, depending on the shape of the cutting object or the cutting object, or the work location, the cutting unit 11 is automatically adjusted in the cutting direction of the saw blade 16 with respect to the quick coupler 11 mounted at the tip of the arm 40 without moving the excavator. It can provide convenience to the driver and improve workability by shortening working time.

As described above, the cutting device using the heavy equipment according to the present invention has the following advantages.

The cutting device is detachably attached to the quick coupler fixed to the arm tip of the excavator, and the saw lead is rotated using the working pressure of the excavator as the power source.Therefore, it is unnecessary to use a separate power source and secures the powerful rotation speed of the saw blade. Workability can be improved.

In addition, the detachment of the bucket, the quick coupler and the cutting device is made by the driver at the work site, so that a separate transport worker for transporting the cutting device and a separate auxiliary worker for mounting the cutting device on the excavator are unnecessary, thereby increasing labor costs. It is possible to prevent the increase in the working cost.

In addition, by adjusting the cutting device to the quick coupler automatically or manually, the working direction of the cutting device can be adjusted according to the shape or working position of the cutting object, minimizing the movement of the excavator, reducing working time and reducing operator fatigue. Can be reduced.

Claims (7)

Quick coupler detachably mounted to the tip of the work device of the excavator; A fixing plate mounted to the rear side of the quick coupler and having a boss formed on an outer side thereof; A column having one end connected to the boss so as to be adjustable in tilting, and having a hydraulic motor driven by the operating pressure of the excavator at the other end thereof; A cutting device comprising a circular diamond saw blade axially fixed to the rotating shaft of the hydraulic motor, and a safety cover detachably fixed to the column and protecting the diamond saw blade; And And a coolant supply means installed in the safety cover and supplying coolant to the diamond saw blade through the nozzle when cutting the cutting object by the diamond saw blade. The method according to claim 1, wherein the means for tilting the cutting device relative to the column to change the cutting direction of the diamond saw blade, One end is connected to the boss so as to adjust the tilting, and the first column is formed in the radial direction on the outer surface of the two or more fastening holes, and the hydraulic motor is mounted on one end and fitted to the first column and coupled to the fastening hole Cutting device using a heavy equipment, characterized in that it comprises a second column rotatably connected to the first column by a fastening member for fastening. The means according to claim 1 or 2, wherein the means for jointly tilting the column with respect to the quick coupler is: Hinge pins that pivotally fix the fixed piece extended to the first column to the boss, and a stopper coupled to the fastening hole formed in the same circumference and the fixed hole of the boss and preventing the first column from rotating. Cutting device using heavy equipment, characterized in that it comprises a pin. Quick coupler detachably mounted to the tip of the work device of the excavator; A hydraulic motor mounted to a fixed box rotatably installed on the quick coupler and driven by an operating pressure of the excavator; A cutting device including a rotary shaft connected to the hydraulic motor by a shaft joint, a circular diamond saw blade fixed to a rotary gear connected to the shaft by the shaft end, and a safety cover protecting the saw blade; A first hydraulic motor for tilting, which is mounted to a fixed box fixed to the quick coupler and driven by an operating pressure of the excavator, and the fixed box with respect to the quick coupler without moving the excavator according to the shape and working position of the cutting object. A first tilting stage for automatically rotating; A second hydraulic motor for tilting is mounted on the outer side of the annular column coupled to the outer side of the rotary shaft and driven by the operating pressure of the excavator, and the quick coupler does not move the excavator according to the shape and working position of the cutting object. Second tilting means for automatically rotating the cutting device; And And a coolant supply means installed on the safety cover and supplying coolant to the diamond saw blade through the nozzle when cutting the cutting object by the diamond saw blade. The method of claim 4, wherein the first tilting means, A first hydraulic motor for tilting mounted to the fixed box; A first drive shaft connected to the first hydraulic motor and having a first worm formed on an outer surface thereof; And And a first worm wheel meshed with the first worm and configured to tilt the fixed box with respect to the quick coupler when the first hydraulic motor is driven. The method of claim 4, wherein the second tilting means, A second hydraulic motor for tilting mounted to the tubular casing coupled to the outside of the rotating shaft; A second drive shaft connected to the second hydraulic motor by a shaft and having a second worm formed on an outer surface thereof; And And a second worm wheel which is formed on an outer surface of the column coupled to the outer side of the rotating shaft to be engaged with the second worm, and tilts the cutting device when the second hydraulic motor is driven. The method of claim 4 or 5, wherein the first worm wheel, It is integrally mounted inside the first worm wheel and accommodates the hydraulic hose for supplying the hydraulic oil to the corresponding parts of the first and second tilting means from the hydraulic tank in the inner center, and when working by tilting the fixing box and the cutting device. Cutting device using a heavy equipment characterized in that it further comprises a turning joint to prevent the hydraulic hose twist.

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