CN210741363U

CN210741363U - Correct-seeking instrument suitable for vertical water turbine generator set

Info

Publication number: CN210741363U
Application number: CN201921338619.8U
Authority: CN
Inventors: 吴刚; 蓝青旋; 韦茂持; 覃雄光; 陈辉; 潘立鹏
Original assignee: Guangxi Guiguan Power Co Ltd Maintenance Branch; Guangxi Guiguan Electric Power Co ltd
Current assignee: Guangxi Guiguan Power Co Ltd Maintenance Branch; Guangxi Guiguan Electric Power Co ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-06-12
Anticipated expiration: 2029-08-19

Abstract

The utility model provides a heart appearance of asking suitable for vertical hydrogenerator group, relate to mechatronic detection technical field, the on-line screen storage device comprises a base, first adjustment seat, second adjustment seat and a steel wire section of thick bamboo, erect the base in the top of vertical hydrogenerator runner room through the hack lever, first adjustment seat can lateral shifting on the base, longitudinal movement on first adjustment seat can be done to the second adjustment seat, first centre bore and second centre bore have been seted up to correspondence on its base and the first adjustment seat, the steel wire hole has been seted up to the second adjustment seat, the steel wire section of thick bamboo rotates and installs on the second adjustment seat, the steel wire hole is passed in proper order to the one end of the copper wire of package on the steel wire section of thick bamboo, second centre bore and first centre bore, and connect a sash weight, through removing first adjustment seat and second adjustment seat, make the axial lead coincidence of copper wire and runner room. The utility model has the advantages of convenient regulation avoids appearing when adjusting a certain direction, and the deviation appears in another direction, can also improve runner room axial lead's measurement of efficiency simultaneously.

Description

Correct-seeking instrument suitable for vertical water turbine generator set

Technical Field

The utility model relates to a mechatronic detects technical field, especially relates to a device of asking for heart suitable for vertical hydroelectric set.

Background

In the development of small hydropower stations, low-water head power stations are abundant in axial-flow type hydroelectric generating sets, the installation of the set is complex and high in precision requirement, the installation quality of the set has great influence on the future operation and service life of the set, the set cannot achieve design output even due to overhigh temperature or overlarge vibration of a bearing bush, the economic benefit is directly influenced, the most critical operation of the installation of the vertical type hydroelectric generating set is positioning and turning, and the positioning comprises positioning of a runner chamber, positioning of a lower frame and positioning of a stator, so that the concentricity of the three meets the design requirement. When the unit is positioned and installed, the most important tool is a centering instrument which is used for measuring the center of the unit, and no existing centering instrument exists at present, and the main purpose is that an installer measures the center by experience.

The common practice is that the center of the runner chamber is roughly measured, a steel wire is hoisted above the runner chamber through an adjusting seat, a hanging hammer is connected below the steel wire and suspended in an oil pan, and then a micrometer is connected in series with a battery, the steel wire and an earphone. During the measurement, the iron cone of micrometer one end is propped up at the inner wall of runner room, when the micrometer stretches out and draws back the contact to the steel wire gradually, forms a circular telegram return circuit, and the earphone will sound owing to there is the electric current to pass through. If the micrometer moves upwards or downwards slightly and the earphone is not loud, the reading of the micrometer is the relative distance between the steel wire and the inner wall of the runner chamber, the size and the direction of the steel wire deviating from the center of the runner chamber can be calculated by measuring the distances between four mutually perpendicular directions of the runner chamber and the steel wire, and the steel wire can be gradually moved to the axial lead of the runner chamber by moving the adjusting seat and monitoring the moving condition by the dial indicator. When the lower frame and the stator are installed, the lower frame and the stator only need to be moved, and the axial lead of the lower frame and the axial lead of the stator are overlapped with the steel wire.

However, this approach has the following drawbacks: because of fine adjustment, when the adjusting seat moves, the direction and the distance are not well controlled, and after the left and right directions are adjusted properly, deviation occurs in the up and down directions, so that time and energy are extremely consumed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems, the utility model aims to provide a be applicable to vertical hydroelectric set's appearance of asking for heart, convenient regulation avoids appearing when adjusting a certain direction, and the condition of deviation appears in another direction, improves runner room axial lead's measurement of efficiency.

In order to achieve the above object, the utility model discloses a scheme be a be applicable to vertical hydroelectric set's appearance of seeking heart, including base, first adjustment seat, second adjustment seat and a steel wire section of thick bamboo, wherein:

a hack lever is arranged on the outer side of the base and used for erecting the base above a runner chamber of the vertical hydraulic generator, a first central hole is formed in the center of the base, transverse first sliding rails are symmetrically arranged on the base in an opposite mode respectively, and the first sliding rails are fixedly connected with the base;

the two outer side walls of the first adjusting seat are respectively connected with the two first sliding tracks in a sliding manner, the two ends of each first sliding track are respectively provided with a propelling mechanism fixedly connected with the base, and the two propelling mechanisms can be respectively abutted against the two opposite walls of the first adjusting seat so as to push the first adjusting seat to move transversely;

a second central hole is formed in the center of the first adjusting seat, longitudinal second sliding rails are symmetrically arranged on two opposite sides of the first adjusting seat respectively, the second sliding rails are fixedly connected with the first adjusting seat, two outer side walls of the second adjusting seat are slidably connected with the two second sliding rails respectively, the two ends of each second sliding rail are provided with the propelling mechanisms fixedly connected with the first adjusting seat, and the two propelling mechanisms can be abutted against two opposite side walls of the second adjusting seat respectively to push the second adjusting seat to move longitudinally;

the steel wire cylinder is rotatably arranged on the second adjusting seat, a steel wire hole is formed in the second adjusting seat, one end of a steel wire wound on the steel wire cylinder sequentially penetrates through the steel wire hole, the second center hole and the first center hole, and a hanging hammer is connected with the steel wire cylinder;

the base with install first percentage table mount and second percentage table mount on the first adjustment seat respectively, wherein, first percentage table mount set firmly in wherein one end of first slip track, the second percentage table mount set firmly in wherein one end of second slip track, just install first percentage table and second percentage table on first percentage table mount and the second percentage table mount respectively, the measuring end of first percentage table can all the time with the lateral wall butt of first adjustment seat in order to measure the lateral displacement of first adjustment seat, the measuring end of second percentage table can all the time with the lateral wall butt of second adjustment seat in order to measure the longitudinal displacement of second adjustment seat.

Further, advancing mechanism includes bolt and link, set up on the link can with bolt threaded connection's screw hole, the link with correspond base or first adjustment seat fixed connection, the bolt with screw hole threaded connection, and can with correspond the lateral wall butt of first adjustment seat or second adjustment seat.

Further, the frame rod comprises a sub rod and a main rod, the sub rod and the main rod are both arranged in a square shape, one end of the main rod is connected with the base, a sliding groove capable of being in sliding fit with the sub rod is formed in the length direction of the main rod, the sub rod is arranged in the sliding groove in a sliding mode, and the sub rod is driven to slide in the sliding groove to extend or shorten the length of the frame rod.

Furthermore, two opposite side surfaces of the two first tracks are provided with a first groove along the axis direction, and two opposite side surfaces of the two second tracks are provided with a second groove along the axis direction; the two horizontal outer sides of the first adjusting seat are respectively provided with a first pulley which can be matched with the first groove, and the two vertical outer sides of the second adjusting seat are respectively provided with a second pulley which can be matched with the second groove in a sliding way.

Furthermore, the dial indicator fixing frame comprises a fixing frame body and a locking piece, a fixing hole is formed in the fixing frame body, a crack is formed in the fixing hole, the locking piece is arranged on the fixing frame body, and the width of the crack can be adjusted through the locking piece, so that the fixing hole is contracted or enlarged.

Further, the locking piece comprises a screw rod, a through hole penetrating through the crack is formed in the fixing frame body, the screw rod penetrates through the through hole, a nut is fixedly arranged at the other end of the through hole, a handle is arranged at one end of the screw rod, the other end of the screw rod is in threaded connection with the nut, the width of the crack can be adjusted by rotating the screw rod, and therefore the fixing hole is contracted or expanded.

Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:

1. through the lateral displacement who removes first adjustment seat adjustment copper wire, the longitudinal displacement of rethread removal second adjustment seat adjustment copper wire, with the mesh that reaches the axial lead coincidence of copper wire and runner room, can avoid when adjusting the horizontal position of copper wire, its vertical position appears removing, perhaps when adjusting its vertical position, horizontal position produces the deviation, it is fixed with first percentage table and second percentage table respectively through first percentage table mount and second percentage table mount simultaneously, its measuring end is adjusted the lateral wall butt of seat with first adjustment seat and second respectively all the time, can the displacement of real-time detection first adjustment seat and second adjustment seat, the device conveniently adjusts, greatly improved work efficiency.

2. The corresponding adjusting seat is pushed to move by the bolts, so that the displacement of the corresponding adjusting seat can be accurately controlled, the control is convenient, and the deviation is avoided.

3. Because the radius of runner room is different, the hack lever can stretch out and draw back, can use the runner room of multiple equidimension not, also deposits when conveniently not needing to use simultaneously, reduces occupation space, convenient transport.

4. Through the two opposite grooves, the two opposite sides of the corresponding adjusting seat are in sliding connection with the grooves, so that the corresponding adjusting seat can move along the direction of the grooves, and the stability is improved; the pulleys which can slide and move in cooperation with the grooves are arranged on two sides of the corresponding adjusting seat, so that resistance of the adjusting seat in the moving process can be reduced, and adjustment is facilitated.

5. The fixing holes are provided with the cracks, and the cracks are extruded through the locking pieces to enable the fixing holes to be contracted or enlarged, so that the structure is simple, and the control is convenient.

6. The screw rod is screwed, so that the crack can be extruded quickly and conveniently, and the screw rod is simple in structure and convenient to operate.

Drawings

Fig. 1 is a schematic view of the heart-finding instrument of the present invention.

Fig. 2 is a partial schematic view of a base and a first adjusting seat of the present invention.

Fig. 3 is a schematic structural view of a first dial indicator fixing frame of the present invention.

In the figure, 101-a base, 102-a frame rod, 103-a first sliding track, 104-a first groove, 105-a first central hole, 201-a first adjusting seat, 202-a first pulley, 203-a second central hole, 204-a second sliding track, 205-a second groove, 301-a second adjusting seat, 302-a second pulley, 401-a bolt, 402-a connecting frame, 501-a steel wire barrel, 601-a first dial indicator fixing frame, 602-a second dial indicator fixing frame, 603-a first dial indicator, 604-a second dial indicator, 605-a crack, 606-a screw rod and 607-a fixing shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, a preferred embodiment of the present invention provides a centering device for a vertical water turbine generator set, including a base 101, a first adjusting seat 201, a second adjusting seat 301 and a steel wire tube, wherein:

the base 101 is arranged in a square shape, a frame rod 102 is arranged on the outer sides of four included angles of the base 101, and the frame rod 102 can enable the base 101 to be erected above a runner chamber of the vertical hydraulic generator. A first central hole 105 is formed in the center of the base 101, two opposite sides of the base 101 are symmetrically provided with a transverse first sliding rail 103, and the first sliding rail 103 is fixedly connected with the base 101.

Preferably, the frame rod 102 includes a sub rod and a main rod, the sub rod and the main rod are both arranged in a square rod, one end of the main rod is fixedly connected to the base 101, a sliding groove capable of being in sliding fit with the sub rod is formed in the length direction of the main rod, the sub rod is slidably embedded in the sliding groove, so that the sub rod cannot be separated from the side portion of the main rod, and the sub rod is driven to slide in the sliding groove to extend or shorten the length of the frame rod 102. Because the radius of runner room is different, hack lever 102 can stretch out and draw back and rotate with the base and be connected can, can be applicable to the runner room of multiple equidimension not, when not needing to use, also make things convenient for folding of hack lever 102 simultaneously, reduce the volume.

The two outer side walls of the first adjusting seat 201 are respectively connected with the two first sliding rails 103 in a sliding manner, two ends of each first sliding rail 103 are respectively provided with a pushing mechanism which is fixedly connected with the base 101, and the two pushing mechanisms can be respectively abutted against the two opposite side walls of the first adjusting seat 201 to push the first adjusting seat 201 to move transversely.

Preferably, two opposite side surfaces of the first sliding rail 103 are respectively provided with a first groove 104 along the axial direction thereof. The first adjusting seat 201 is provided with a first pulley 202 at two lateral outer sides thereof, which can be in sliding fit with the first groove 104. Through the cooperation of two first recesses 104 that are relative and first pulley 202, can make first adjustment seat 201 remove along the direction of first recess 104, improve stability, reduce the resistance of first adjustment seat 201 removal in-process, conveniently adjust.

A second center hole 203 is formed in the center of the first adjusting seat 201, longitudinal second sliding rails 204 are symmetrically arranged on two opposite sides of the first adjusting seat 201, and the second sliding rails 204 are fixedly connected with the first adjusting seat 201. The two outer side walls of the second adjusting seat 301 are respectively connected with the two second sliding rails 204 in a sliding manner, and two ends of the second sliding rails 204 are respectively provided with a propulsion mechanism fixedly connected with the first adjusting seat 201, and the two propulsion mechanisms can be respectively abutted against the two opposite side walls of the second adjusting seat 301 to push the second adjusting seat 301 to move longitudinally.

Preferably, two opposite side surfaces of the two second sliding tracks 204 are respectively provided with a second groove 205 along the axial direction thereof, and two longitudinal outer sides of the second adjusting seat 301 are respectively provided with a second pulley 302 capable of being in sliding fit with the second groove 205. Through the matching of the two opposite second grooves 205 and the second pulley 302, the second adjusting seat 301 can move along the direction of the second grooves 205, the stability is improved, the resistance of the second adjusting seat 301 in the moving process is reduced, and the adjustment is convenient.

The steel wire cylinder 501 is rotatably installed on the second adjusting seat 301, a steel wire hole is formed on the second adjusting seat 301, one end of a steel wire wound on the steel wire cylinder 501 sequentially passes through the steel wire hole, the second center hole 203 and the first center hole 105, and a hanging weight 502 is connected thereto.

A first dial indicator fixing frame 601 and a second dial indicator fixing frame 602 are respectively arranged on the base 101 and the first adjusting seat 201, wherein the first dial indicator fixing frame 601 is fixedly arranged at one end of the first sliding rail 103, the second dial indicator fixing frame 602 is fixedly arranged at one end of the second sliding rail 204, a first dial indicator 603 and a second dial indicator 604 are respectively arranged on the first dial indicator fixing frame 601 and the second dial indicator fixing frame 602, an axial line of a measuring end of the first dial indicator 603 is arranged along the length direction of the first sliding rail 103 and can be always abutted against the side wall of the first adjusting seat 201 to measure the displacement of the first adjusting seat 201, an axial line of a measuring end of the second dial indicator 604 is arranged along the length direction of the second sliding rail 204 and can be always abutted against the side wall of the second adjusting seat 301, to measure the displacement of the second adjustment block 301. In the present embodiment, the structure and usage of the first percentage table 603 and the second percentage table 604 are all in the prior art, and are not described in detail herein for brevity.

Preferably, the pushing mechanism includes a bolt 401 and a connecting frame 402, a threaded hole capable of being in threaded connection with the bolt 401 is formed in the connecting frame 402, the connecting frame 402 is fixedly connected with the corresponding base 101 or the first adjusting seat 201, the bolt 401 is in threaded connection with the threaded hole, and the axis direction of the bolt 401 is arranged along the length direction corresponding to the first sliding track 103 or the second sliding track 204, so that the tip of the bolt 401 can abut against the corresponding side wall of the first adjusting seat 201 or the second adjusting seat 301, and the bolt 401 is rotated to advance or retreat the corresponding first adjusting seat 201 or the second adjusting seat 301, thereby pushing the first adjusting seat 201 to move transversely or the second adjusting seat 301 to move longitudinally. Adopt bolt 401 can control the displacement of the first adjustment seat 201 or the second adjustment seat 201 that correspond accurately, convenient control avoids appearing the deviation.

Preferably, the first dial indicator fixing frame 601 and the second dial indicator fixing frame 602 have the same structure and both include a fixing frame body and a locking member, the fixing frame body is provided with a fixing hole, a slit 605 is provided above the fixing hole, the locking member is mounted on the fixing frame body, and the width of the slit 605 can be adjusted by the locking member, so that the fixing hole is contracted or expanded. The first dial indicator 603 and the second dial indicator 604 respectively comprise a fixing shaft 607, and the first dial indicator 603 and the second dial indicator 604 are respectively penetrated into fixing holes of the first dial indicator fixing frame 601 and the second dial indicator fixing frame 602 through the fixing shafts 607. The fixing holes are provided with the slits 605, the width of the slits 605 is adjusted through the locking pieces, so that the fixing holes are contracted or expanded, the first dial indicator 603 or the second dial indicator 604 can be fixed, the structure is simple, and the control is convenient.

Preferably, the locking member includes a screw 606, a through hole penetrating through the slit 605 is formed in the fixing frame body, the screw 606 is inserted into the through hole, a nut is fixedly arranged at one end of the through hole, a handle is arranged at one end of the screw 606, the other end of the screw is in threaded connection with the nut, and the width of the slit 605 can be adjusted by rotating the screw 606, so that the fixing hole is contracted or expanded. The width of the crack 605 can be adjusted quickly and conveniently by screwing the screw 606, and the structure is simple and the operation is convenient.

The utility model discloses a theory of operation:

roughly measuring the position of an axis of a runner chamber, unfolding a frame rod 102 to fix a base 101 above the runner chamber, locating the position of the roughly measured axis, placing an oil pan in the runner chamber, enabling a hammer 502 at the lower end of a steel wire to be located in the oil pan, then connecting a micrometer in series with a battery, a steel wire and an earphone, enabling an iron cone at one end of the micrometer to be supported on the inner wall of the runner chamber, if the micrometer moves upwards or downwards slightly and the earphone does not sound, indicating that the reading of the micrometer is the relative distance between the steel wire and the inner wall of the runner chamber at the moment, calculating the size and the direction of the steel wire deviating from the axis of the runner chamber by measuring the distance between four mutually perpendicular directions of the runner chamber and the steel wire, enabling a first adjusting seat 201 or a second adjusting seat 301 in the corresponding direction to move by adjusting a corresponding bolt 401, and detecting the moving stroke of the corresponding first dial indicator and the second dial indicator when the dial indicator moves, the steel wire is gradually moved to coincide with the axis of the runner chamber.

The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.

Claims

1. The utility model provides a request heart appearance suitable for vertical hydroelectric set, includes base (101), first adjustment seat (201), second adjustment seat (301) and a steel wire section of thick bamboo, its characterized in that:

a frame rod (102) is arranged on the outer side of the base (101), the frame rod is used for erecting the base (101) above a runner chamber of the vertical hydraulic generator, a first central hole (105) is formed in the center of the base (101), transverse first sliding rails (103) are symmetrically arranged on the base in an opposite mode respectively, and the first sliding rails (103) are fixedly connected with the base (101);

two outer side walls of the first adjusting seat (201) are respectively in sliding connection with the two first sliding rails (103), two ends of each first sliding rail (103) are respectively provided with a propelling mechanism fixedly connected with the base (101), and the two propelling mechanisms can be respectively abutted against two opposite walls of the first adjusting seat (201) so as to push the first adjusting seat (201) to move transversely;

a second center hole (203) is formed in the center of the first adjusting seat (201), longitudinal second sliding rails (204) are symmetrically arranged on two opposite sides of the first adjusting seat (201), the second sliding rails (204) are fixedly connected with the first adjusting seat (201), two outer side walls of the second adjusting seat (301) are slidably connected with the two second sliding rails (204), and the two ends of the second sliding rails (204) are provided with the propulsion mechanisms fixedly connected with the first adjusting seat (201), and the two propulsion mechanisms can be abutted against two opposite side walls of the second adjusting seat (301) respectively to propel the second adjusting seat (301) to move longitudinally;

the steel wire barrel (501) is rotatably arranged on the second adjusting seat (301), a steel wire hole is formed in the second adjusting seat (301), one end of a steel wire wound on the steel wire barrel (501) sequentially penetrates through the steel wire hole, the second center hole (203) and the first center hole (105), and a hanging hammer is connected with the steel wire hole;

a first dial indicator fixing frame (601) and a second dial indicator fixing frame (602) are respectively arranged on the base (101) and the first adjusting seat (201), wherein the first dial indicator fixing frame (601) is fixedly arranged at one end of the first sliding track (103), the second dial indicator fixing frame (602) is fixedly arranged at one end of the second sliding track (204), and the first dial indicator fixing frame (601) and the second dial indicator fixing frame (602) are respectively provided with a first dial indicator (603) and a second dial indicator (604), the measuring head of the first dial indicator (603) can be always abutted with the side wall of the first adjusting seat (201), so as to measure the transverse displacement of the first adjusting seat (201), and the measuring end head of the second dial indicator (604) can be always abutted against the side wall of the second adjusting seat (301) so as to measure the longitudinal displacement of the second adjusting seat (301).

2. The centering instrument suitable for the vertical water-turbine generator set according to claim 1, characterized in that: the propulsion mechanism comprises a bolt (401) and a connecting frame (402), a threaded hole capable of being in threaded connection with the bolt (401) is formed in the connecting frame (402), the connecting frame (402) is fixedly connected with the base (101) or the first adjusting seat (201) correspondingly, the bolt (401) is in threaded connection with the threaded hole, and can be abutted against the side wall of the first adjusting seat (201) or the second adjusting seat (301) correspondingly.

3. The centering instrument suitable for the vertical water-turbine generator set according to claim 1, characterized in that: the frame rod (102) comprises a sub rod and a main rod, the sub rod and the main rod are arranged in a square shape, one end of the main rod is connected with the base (101), a sliding groove capable of being in sliding fit with the sub rod is formed in the length direction of the main rod, the sub rod is arranged in the sliding groove in a sliding mode, and the sub rod is driven to slide in the sliding groove to extend or shorten the length of the frame rod (102).

4. The centering instrument suitable for the vertical water-turbine generator set according to claim 1, characterized in that: two opposite side surfaces of the two first tracks are provided with a first groove (104) along the axial direction of the two first tracks, and two opposite side surfaces of the two second tracks are provided with a second groove (205) along the axial direction of the two second tracks; the two transverse outer sides of the first adjusting seat (201) are respectively provided with a first pulley (202) which can be matched with the first groove (104), and the two longitudinal outer sides of the second adjusting seat (301) are respectively provided with a second pulley (302) which can be matched with the second groove (205) in a sliding manner.

5. The centering instrument suitable for the vertical water-turbine generator set according to claim 1, characterized in that: the dial indicator fixing frame comprises a fixing frame body and a locking piece, wherein a fixing hole is formed in the fixing frame body, a crack (605) is formed in the fixing hole, the locking piece is arranged on the fixing frame body, and the width of the crack (605) can be adjusted through the locking piece, so that the fixing hole is contracted or enlarged.

6. The center finder for the vertical water turbine generator set according to claim 5, wherein: the locking piece comprises a screw rod (606), a through hole penetrating through the crack (605) is formed in the fixing frame body, the screw rod (606) penetrates through the through hole, a nut is fixedly arranged at the other end of the through hole, a handle is arranged at one end of the screw rod (606), the other end of the screw rod is in threaded connection with the nut, and the width of the crack (605) can be adjusted by rotating the screw rod (606), so that the fixing hole is contracted or enlarged.