CN219378583U

CN219378583U - Tube bundle coupling assembling machine

Info

Publication number: CN219378583U
Application number: CN202320352932.7U
Authority: CN
Inventors: 郝西虎
Original assignee: Sinuowei Automated Science And Technology Co ltd
Current assignee: Sinuowei Automated Science And Technology Co ltd
Priority date: 2023-03-01
Filing date: 2023-03-01
Publication date: 2023-07-21
Anticipated expiration: 2033-03-01

Abstract

The utility model relates to the field of tube bundle coupler production equipment, in particular to a tube bundle coupler assembly machine which is characterized by comprising a throat hoop feeding detection module and an assembly module, wherein the throat hoop feeding detection module comprises a throat hoop feeding mechanism, a CCD visual detection mechanism and a throat hoop shaping mechanism which are sequentially connected in sequence; the assembling module comprises a metal sheet feeding mechanism, a rolling piece transferring mechanism, an assembling mechanism, a riveting transferring mechanism, a riveting machine and a discharging transferring mechanism which are sequentially connected in sequence in the working procedure, a manipulator which plays a role in transferring connection is further arranged between the assembling module and the throat hoop feeding detection module, and the manipulator can transfer the throat hoops at the output end of the throat hoop shaping mechanism to the assembling mechanism. The utility model is helpful for solving the problems that the existing tube bundle coupler has high manual participation when the hose clamp and the rolled metal sheet are assembled, time and labor are wasted, the assembly precision is difficult to control, and the consistency of the product quality is difficult to ensure.

Description

Tube bundle coupling assembling machine

Technical Field

The utility model relates to the field of tube bundle coupler production equipment, in particular to a tube bundle coupler assembly machine.

Background

The tube bundle coupler, also called tube bundle assembly, is made of rolled metal sheet with outer side wound with throat hoop and is mainly used for jointing rigid pipe fittings.

The hose clamp is a fastener for connecting soft and hard pipes and is widely used in the fields of industrial production and life. The commonly used laryngeal cuffs can be divided into an English type laryngeal cuff, an American type laryngeal cuff and a German type laryngeal cuff; wherein, the material of De type hose clamp is iron and the surface galvanization, and the knot is a punch forming's hose clamp, has torsion big, price moderate grade advantage.

At present, the processing of tube bank shaft coupling mainly divide into sheetmetal book circle and book circle back sheetmetal and throat hoop riveting two big modules, mainly rely on artifical the participation, establish finished product throat hoop equipment cover on the sheetmetal after the book circle, put into the riveter one by one and accomplish the riveting, this kind of mode manual engagement degree is higher, and the equipment cover of sheetmetal after throat hoop and the book circle is established and is required higher to the assembly precision, and manual operation is difficult to its accurate accuse, wastes time and energy, and product quality uniformity is difficult to guarantee.

Disclosure of Invention

The utility model mainly aims to provide a tube bundle coupler assembly machine which is beneficial to solving the problems that when the existing tube bundle coupler is assembled by a throat hoop and a rolled metal sheet, the labor participation degree is high, time and labor are wasted, the assembly precision is difficult to control, and the consistency of the product quality is difficult to guarantee.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the tube bundle coupler assembly machine comprises a throat hoop feeding detection module and an assembly module, wherein the throat hoop feeding detection module comprises a throat hoop feeding mechanism, a CCD visual detection mechanism and a throat hoop shaping mechanism which are sequentially connected in sequence; the assembling module comprises a metal sheet feeding mechanism, a rolling piece transferring mechanism, an assembling mechanism, a riveting transferring mechanism, a riveting machine and a discharging transferring mechanism which are sequentially connected in sequence in the working procedure, a manipulator which plays a role in transferring connection is further arranged between the assembling module and the throat hoop feeding detection module, and the manipulator can transfer the throat hoops at the output end of the throat hoop shaping mechanism to the assembling mechanism.

On the basis of the technical scheme, the throat hoop feeding detection module is provided with at least two feeding paths, each feeding path is provided with an independent CCD visual detection mechanism, the CCD visual detection mechanism is provided with a turnover clamping structure and is used for correcting the shape of the throat hoops, and the tail end of each feeding path is provided with a shaping mechanism for shaping and positioning the throat hoops.

On the basis of the technical scheme, the manipulator is provided with the inflatable chuck with the multi-axis motion function and is used for clamping and transferring the hose clamp at the output end of the shaping mechanism.

On the basis of the technical scheme, the metal sheet feeding mechanism comprises a first rotary table capable of rotating in a stepping mode, a plurality of material storage frames are arranged on the first rotary table in a central symmetry mode and used for stacking metal sheets, a sucker device is arranged at the output end of the first rotary table and used for adsorbing the metal sheets at the position of the output end and outputting the metal sheets to the output end of the rolling mechanism.

On the basis of the technical scheme, the rolling mechanism comprises a pre-rolling device and a rolling device, and the metal sheet output by the metal sheet feeding mechanism is processed by the pre-rolling device and then enters the rolling device.

On the basis of the technical scheme, the pre-rolling device comprises a driving roller and two guide rollers which are horizontally arranged, the two guide rollers are arranged at the bottom of the driving roller at intervals, and a gap between the driving roller and the guide rollers is used for allowing a metal sheet to enter and driving the metal sheet to rotate and bend.

On the basis of the technical scheme, the rolling device comprises a first bending frame and a second bending frame, the first bending frame and the second bending frame are symmetrically arranged, the bottom of the rolling device is provided with a hinge structure and is connected with a turning driving piece, a bending metal sheet output from the pre-rolling device is conveyed to the inner sides of the first bending frame and the second bending frame, the first bending frame and the second bending frame can synchronously and inwards turn over, a bending profile of a central symmetrical polygon is formed on the inner sides, and the bending profile is abutted against the metal sheet on the inner sides to obtain the rolling piece.

On the basis of the technical scheme, the rolling mechanism is arranged between the bottom of the first bending frame and the bottom of the second bending frame, and a base capable of jacking up the metal sheet is arranged between the first bending frame and the second bending frame.

On the basis of the technical scheme, the assembly mechanism comprises a second turntable capable of rotating in a stepping mode, a plurality of tool holders are arranged on the second turntable in a central symmetry mode, and the tool holders are used for tool hoops and round rolling pieces.

Compared with the prior art, the utility model at least comprises the following advantages:

according to the utility model, the throat hoop feeding detection module and the assembly module are integrated, the throat hoop feeding detection module can automatically feed throat hoops and complete form calibration adjustment and shaping, stable and accurate supply is ensured, the metal sheet feeding mechanism and the rolling mechanism in the assembly module cooperate to automatically perform rolling body forming, the assembly mechanism is used for integrating the rolling body and the throat hoops to provide a tool foundation, the cooperative transportation mechanism completes assembly, and the rivet machine can rivet the assembly body, so that the throat hoops and the rolling body are mutually connected and fixed, and a finished product is obtained. The mechanical and electrical automation system is utilized to replace the existing manual intervention semi-automatic processing mode, so that the labor intensity of operators can be reduced, the assembly error caused by manual operation and the situation of insufficient positioning accuracy of the tool can be improved, the assembly accuracy is improved, and the consistency of the product quality is guaranteed.

Drawings

FIG. 1 is a top view of a tube bundle coupler adapter machine in one embodiment;

FIG. 2 is a schematic perspective view of the throat hoop feed detection module of FIG. 1;

FIG. 3 is a schematic view of the sheet metal feed mechanism of FIG. 1;

FIG. 4 is a schematic diagram of a pre-rounding apparatus;

FIG. 5 is a schematic structural view of a rounding device;

FIG. 6 is a schematic structural view of the assembly mechanism;

FIG. 7 is a schematic view of a clamping structure of a manipulator;

FIG. 8 is a schematic structural view of a roll transfer mechanism;

FIG. 9 is a schematic structural view of a rivet transfer mechanism;

fig. 10 is a schematic structural view of a riveting machine at the end.

The drawing is marked: 100. a throat hoop feeding detection module; 200. assembling a module; 1. a throat hoop feeding mechanism; 2. a CCD visual detection mechanism; 3. a laryngeal cuff shaping mechanism; 4. a manipulator; 41. an inflatable chuck; 5. a sheet metal feed mechanism; 51. a first turntable; 52. a storage rack; 53. a suction cup device; 6. a rolling mechanism; 61. a pre-rolling device; 611. a driving roller; 612. a guide roller; 62. a rolling device; 621. a base; 622. a first press bending frame; 623. a second press bending frame; 7. a round piece transferring mechanism; 71. a first clamping member; 72. a first displacement device; 8. an assembly mechanism; 81. a second turntable; 82. a tool seat; 83. a pressing plate; 9. riveting and transferring mechanism; 91. a second displacement device; 92. a second clamping member; 93. a third clamping member; 94. a fourth clamping member; 10. a riveting machine; 11. a discharging and transferring mechanism; a. a laryngeal cuff; b. a metal sheet; c. a rolling piece; d. an assembly; e. and (5) obtaining a finished product.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific examples.

Referring to fig. 1 to 10, the present embodiment discloses a tube bundle coupler assembling machine, which includes a throat hoop feeding detection module 100 and an assembling module 200, capable of completing automatic assembly of the tube bundle coupler.

Wherein, in combination with fig. 2, the throat hoop feeding detection module 100 comprises two feeding paths, and each feeding path is provided with a throat hoop feeding mechanism 1, a CCD visual detection mechanism 2 and a throat hoop shaping mechanism 3 which are sequentially connected with each other in sequence.

The throat hoop feeding mechanism 1 adopts a vibration disc and is used for conveying throat hoops a to the CCD visual detection mechanism 2 one by one.

The CCD visual detection mechanism 2 is used for detecting the shape of the throat hoop (such as hoop shell angle, screw direction and the like) of the detection area of each path, the CCD visual detection mechanism 2 also comprises a clamping device capable of overturning and clamping the throat hoop a, and the shape deviation correcting actions such as rotation on the horizontal plane, overturning of the front side and the back side and the like can be carried out on each throat hoop a according to the addition detection result, so that the throat hoops a can be output in a unified shape.

The throat hoop shaping mechanism 3 is positioned at the rear side of the CCD visual detection mechanism 2 and is used as the output end of the throat hoop feeding detection module 100. The throat hoop shaping mechanism 3 is provided with a push rod perpendicular to the output path of the CCD visual detection mechanism 2, a transfer area is arranged on the push rod pushing side, and the push rods can be pushed to the transfer area one by one through the throat hoops a subjected to form correction, so that preparation is made for transferring to the assembly module 200. The tail end of the push rod is provided with a positioning contour matched with the throat hoop a, so that the throat hoop a is prevented from deflecting in a transverse pushing mode.

As shown in fig. 1, the assembly module 200 includes a sheet metal feeding mechanism 5, a rolling mechanism 6, a rolling piece transferring mechanism 7, an assembly mechanism 8, a riveting transferring mechanism 9, a riveting machine 10 and a discharging transferring mechanism 11, which are sequentially connected in sequence, and a manipulator 4 playing a role in transferring connection is further provided between the assembly module 200 and the throat hoop feeding detection module 100, and the manipulator 4 can transfer a throat hoop a at the output end of the throat hoop shaping mechanism 3 to the assembly mechanism 8. The assembling module 200 is used for rolling the metal sheet b to obtain a rolled body, assembling the rolled body and the throat hoop a to obtain an assembly c, and riveting the assembly c to obtain a finished product e.

Specifically, the metal sheet feeding mechanism 5 and the rolling mechanism 6 in the assembly module 200 are used for rolling the metal sheet b with the flat plate structure to obtain a rolled body.

Further, as shown in fig. 3, the sheet metal feeding mechanism 5 includes a first rotating disc 51, and a stepper motor is drivingly connected to the bottom of the first rotating disc 51, so that the first rotating disc 51 can rotate stepwise. The first turntable 51 is provided with 8 storage frames 52 in central symmetry, the upper and lower openings of the storage frames 52 are formed in the inner side of the storage frames 52, spaces for accommodating metal sheets b are formed in the inner sides of the storage frames 52, the metal sheets b are horizontally arranged and vertically stacked into a group one by one, the metal sheets b at the bottom are clamped on the storage frames 52 and are prevented from falling off, the first turntable 51 is provided with an output end, the output end is a station, the bottom of the output end is provided with a jacking device capable of penetrating through the bottom opening of the storage frames 52 and used for jacking and supplementing the metal sheets b at the output end, the top of the output end is provided with a sucker device 53 which is provided with a pneumatic sucker and used for adsorbing the metal sheets b at the top, the sucker device 53 is further provided with a transverse moving and lifting driving assembly, and the sucker device 53 is particularly provided with a cylinder and guide rail structure and is used for adsorbing and outputting the metal sheets b at the output end to the rolling mechanism 6. During operation, each material storage rack 52 rotates to the output end position in turn, and all the metal sheets b in the material storage rack 52 rotate to the next station after being output, and the station is used as a new material inlet and can be realized by adopting a manual blanking or transferring device.

Further, the rounding mechanism 6 includes a pre-rounding device 61 and a rounding device 62.

As shown in fig. 4, the pre-rolling device 61 has a driving roller 611 which is horizontally arranged, one side of the driving roller 611 is connected with a motor, two guide rollers 612 which are horizontally arranged at intervals are arranged below the driving roller 611, the guide rollers 612 and the driving roller 611 are connected with a lower frame through bearing members, a bending gap is formed between three roller bodies, a metal sheet b output by the sucking disc device 53 transversely enters the bending gap, after the metal sheet b enters, the upper end surface and the lower end surface are respectively abutted against the driving roller 611 and the guide rollers 612, the driving roller 611 is used as a driving roller to drive the metal sheet b to rotate, and the bending gap can play a guiding role, so that the metal sheet b rotates and bends to form a cylindrical metal sheet b.

As shown in fig. 5, the rolling device 62 is located at one side of the pre-rolling device 61, and a transfer structure is disposed between the rolling device and the pre-rolling device to transfer the workpiece, and the transfer structure specifically adopts movable elements such as a pneumatic claw and a cylinder, and the roundness of the metal sheet b processed by the pre-rolling device 61 cannot meet the precision requirement, so that the cylindrical metal sheet b processed by the pre-rolling device 61 is transferred to the rolling device 62 to perform the lifting treatment of rolling precision.

Specifically, the rounding device 62 includes a first bending frame 622 and a second bending frame 623, which are symmetrically arranged, a base 621 is disposed at a central position of the bottom, the base 621 is fixedly connected with a frame below, bottoms of the first bending frame 622 and the second bending frame 623 are hinged to the top of the base 621, and bottoms of the first bending frame 622 and the second bending frame 623 are also connected with a turning driving piece, the turning driving piece adopts an air cylinder, and can drive the tops of the first bending frame 622 and the second bending frame 623 to perform symmetrical internal and external turning actions.

In the specific implementation process, the cylindrical metal sheet b output from the pre-rolling device 61 is conveyed to the inner sides of the first bending frame 622 and the second bending frame 623, the first bending frame 622 and the second bending frame 623 can synchronously turn inwards to form a central regular hexagonal bending profile on the inner side, and the bending profile abuts against the metal sheet b on the inner side, so that the outer profile of the metal sheet b is precisely rolled and shaped, and a rolled piece is obtained.

Further, in order to facilitate the mechanical disassembly and assembly of the rolling piece on the rolling device 62 and the full inward turning and sealing of the first bending frame 622 and the second bending frame 623, the rolling mechanism 6 is located between the bottom of the first bending frame 622 and the bottom of the second bending frame 623, and a base 621 capable of lifting up the metal sheet b is arranged between the bottom of the first bending frame 622 and the bottom of the second bending frame 623.

The assembly device 8 is arranged on one side of the rounding device 62, as shown in fig. 6, the assembly device 8 comprises a second rotary table 81, a stepping motor is connected to the bottom of the second rotary table 81, the second rotary table 81 can rotate in a stepping mode, 4 tool holders 82 are arranged on the second rotary table 81 in a central symmetry mode, the tool holders 82 are used for holding the tool hoops a and rounding pieces, in particular, 4 clamping grooves which are transversely arranged are formed in the tool holders 82, the clamping grooves are used for holding the 4 hoops a, the hoops a are vertically arranged in the clamping grooves, that is, through holes on the inner sides of the hoops a are horizontally oriented, in order to ensure that the hoops a can be kept stable when being placed in the clamping grooves, the top of each tool holder 82 is not rocked, a pressing plate 83 is arranged above the tool holders 82, and the pressing plate 83 is connected with a lifting device which is particularly adopts a cylinder and guide rail structure and is used for clamping the hoops a below so that the hoops a can be stabilized on the tool holders 82 and are ready for assembly.

Further, referring to fig. 1 and 7, in this embodiment, two manipulators 4 are disposed on a side of the assembly mechanism 8 near the output end of the shaping mechanism, the manipulators 4 are provided with inflatable chucks 41 with multiple axis motion functions, the inflatable chucks 41 can be pneumatically controlled to have outer diameter sizes, when the inflatable chucks are supported, the inflatable chucks 41 can be clamped on the inner side wall of the throat hoop a to form a clamping structure, the outer contour of the inflatable chucks 41 is a circular curved surface, the contour of the inner side wall of the throat hoop a can be adapted, deformation of the throat hoop a during clamping is avoided, and the manipulators 4 are used for transferring the throat hoop a at the output end of the shaping mechanism into a clamping groove on the tool seat 82.

The assembly device 8 and the rolling device 62 are provided with a rolling piece transferring mechanism 7, and in combination with fig. 8, the rolling piece transferring mechanism 7 is provided with a first clamping piece 71 horizontally arranged, the first clamping piece 71 adopts a pneumatic clamping jaw, the rolling piece can be clamped by means of opening and closing of the pneumatic clamping jaw, the first clamping piece 71 Li Lianjie is provided with a first displacement device 72, the first position device comprises a transverse moving sliding block and a lifting sliding block, driving pieces such as a motor screw rod or a cylinder guide rail are respectively connected to control the horizontal and vertical movement of the first clamping piece 71, and the rolling piece is transferred. The rolling piece transferring mechanism 7 is used for transferring the rolling piece on the rolling device 62 to the tool seat 82, and meanwhile, the rolling piece is inserted into the inner side of the throat hoop a, and the first clamping piece 71 horizontally arranged can adapt to the transverse insertion action of the rolling piece, so that an assembly c is obtained.

With reference to fig. 1, 2 riveting machines 10 are arranged on one side, away from the rolling mechanism 6, of the assembly mechanism 8, as shown in fig. 10, the riveting machines 10 are used for riveting an assembly c, so that a throat hoop a is fixedly connected with the rolling body, a front riveting machine 10 and a rear riveting machine 10 are used for riveting two different areas on the assembly c, and a finished product e is obtained after the riveting is finished. The riveting machine 10 is conventional and the specific structure and operation thereof are not described herein.

The riveting machine 10 is equipped with riveting transport mechanism 9 on one side, combines fig. 9, and riveting transport mechanism 9 includes and is connected swing joint's second displacement device 91 with the frame, and second displacement device 91 includes level and reciprocates the structure, and this level and reciprocate the driving piece such as structure adoption motor lead screw or cylinder guide rail, and its end-to-end connection has second clamping part 92, third clamping part 93 and fourth clamping part 94 of interval distribution, and the pneumatic clamping jaw that the three all adopted the level to carry out the centre gripping to the work piece to cooperate second displacement device 91 to carry out level and reciprocate, carry out the transportation of work piece. The third clamping member 93 is further connected to a rotating device, and the rotating device is a pneumatic disc and is used for performing angle rotation after clamping the workpiece.

In specific implementation, the second clamping member 92, the third clamping member 93 and the fourth clamping member 94 move transversely synchronously, the second clamping member 92 is used for transferring the assembly c at the output end of the converting mechanism to the first riveting machine 10 for first riveting, the third clamping member 93 is used for transferring the workpiece processed by the first riveting machine 10 to the second riveting machine 10 at the rear side for second riveting, so as to obtain a finished product e, the fourth clamping member 94 is used for outputting the finished product e after riveting processing on the second riveting machine 10 to the rear side, a discharging mechanism is arranged in the rear side area, a pneumatic clamping structure is arranged on the discharging mechanism, the pneumatic clamping structure is connected with a transverse moving and lifting structure, and the transverse moving and lifting structure specifically adopts a driving structure such as a motor screw rod and a cylinder guide rail and the like for transferring the finished product e on the fourth clamping member 94 to the discharging port for outputting.

Furthermore, in order to reduce assembly and fixation, the throat hoop a and the rolling piece are required to be subjected to roundness, size and other index detection by a detection device before being assembled.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The tube bundle coupler assembling machine is characterized by comprising a throat hoop feeding detection module (100) and an assembling module (200), wherein the throat hoop feeding detection module (100) comprises a throat hoop feeding mechanism (1), a CCD visual detection mechanism (2) and a throat hoop shaping mechanism (3) which are sequentially connected in sequence; the assembling module (200) comprises a metal sheet feeding mechanism (5), a rolling mechanism (6), a rolling piece transferring mechanism (7), an assembling mechanism (8), a riveting transferring mechanism (9), a riveting machine (10) and a discharging transferring mechanism (11), wherein the metal sheet feeding mechanism, the rolling mechanism and the rolling piece transferring mechanism are sequentially connected in sequence, a manipulator (4) playing a role in transferring connection is further arranged between the assembling module (200) and the throat hoop feeding detection module (100), and the manipulator (4) can transfer a throat hoop (a) at the output end of the throat hoop shaping mechanism (3) to the assembling mechanism (8).

2. The tube bundle coupler assembly machine according to claim 1, wherein the throat hoop feeding detection module (100) is provided with at least two feeding paths, each feeding path is provided with an independent CCD visual detection mechanism (2), the CCD visual detection mechanism is provided with a turnover clamping structure and is used for carrying out form correction on the throat hoops (a), and the tail end of each feeding path is provided with a shaping mechanism and is used for shaping and positioning the throat hoops (a).

3. Tube bundle coupling assembling machine according to claim 2, characterized in that the manipulator (4) is provided with an inflatable chuck (41) with a multiaxial movement function for clamping and transferring the throat hoop (a) at the output end of the shaping mechanism.

4. Tube bundle coupler assembly machine according to claim 1, characterized in that the sheet metal feeding mechanism (5) comprises a first turntable (51) capable of rotating step by step, a plurality of material storage frames (52) are arranged on the first turntable (51) in a central symmetry manner, the material storage frames (52) are used for stacking the sheet metal (b), a sucker device (53) is arranged at the output end of the first turntable (51) and used for sucking and outputting the sheet metal (b) at the output end position to the output end of the rounding mechanism (6).

5. The tube bundle coupler assembly machine according to claim 4, wherein the rolling mechanism (6) comprises a pre-rolling device (61) and a rolling device (62), and the metal sheet (b) output by the metal sheet feeding mechanism (5) is processed by the pre-rolling device (61) and then enters the rolling device (62).

6. The tube bundle coupler assembly machine according to claim 5, wherein the pre-rolling device (61) comprises a driving roller (611) and two guide rollers (612) which are horizontally arranged, the two guide rollers (612) are arranged at the bottom of the driving roller (611) at intervals, and a gap between the driving roller (611) and the guide rollers (612) is used for allowing a metal sheet (b) to enter and driving the metal sheet (b) to rotate and bend.

7. Tube bundle coupling assembling machine according to claim 5 or 6, characterized in that the rounding device (62) comprises a first press bending frame (622) and a second press bending frame (623), which are symmetrically arranged, the bottom is provided with a hinge structure and is connected with a turning driving element, the bent metal sheet (b) output from the pre-rounding device (61) is conveyed to the inner sides of the first press bending frame (622) and the second press bending frame (623), the first press bending frame (622) and the second press bending frame (623) can synchronously turn inwards, the inner sides form a press bending contour of a central symmetrical polygon, and the press bending contour is abutted against the metal sheet (b) on the inner side to obtain the rounding element.

8. Tube bundle coupling assembling machine according to claim 7, characterized in that the rounding mechanism (6) is provided with a base (621) between the bottom of the first press bending frame (622) and the bottom of the second press bending frame (623) capable of lifting up the metal sheet (b).

9. The tube bundle coupler assembly machine according to claim 1, wherein the assembly mechanism (8) comprises a second turntable (81) capable of rotating in a stepping manner, a plurality of tool holders (82) are arranged on the second turntable (81) in a central symmetry manner, and the tool holders (82) are used for a tool hose clamp (a) and a rolling piece.