CN219542369U

CN219542369U - Frock clamp for lathe

Info

Publication number: CN219542369U
Application number: CN202320285071.5U
Authority: CN
Inventors: 虞伟炳; 李金国; 孙宏挺; 郭国俊; 应建华; 陈剑富
Original assignee: Zhejiang Saihao Industrial Co ltd
Current assignee: Zhejiang Saihao Industrial Co ltd
Priority date: 2023-02-22
Filing date: 2023-02-22
Publication date: 2023-08-18
Anticipated expiration: 2033-02-22

Abstract

The utility model provides a tool clamp for a machine tool, and belongs to the technical field of machine tools. It has solved the low problem of current anchor clamps centre gripping precision. The middle of this frock clamp spliced pole bottom for lathe has the connecting portion that downward bulge set up, the left and right sides of spliced pole bottom all has the step groove that the recess set up, the step face slant of step groove in the top is in downward sloping setting, the top of locking board has the guide surface that slant downward sloping set up, the locking board slides and sets up on the base and the embedding sets up in the step groove that corresponds, the guide surface is laminated mutually with the step face that corresponds, the regulation hole that runs through has in the connecting portion, the aperture of regulation hole is greater than the external diameter of first adjusting bolt pole portion, first adjusting bolt passes regulation hole and a pair of locking board, rotatory first adjusting bolt makes the locking board slide along the base and makes the spliced pole reciprocate through the locking board. The tool clamp for the machine tool has the advantage of high clamping precision.

Description

Frock clamp for lathe

Technical Field

The utility model belongs to the technical field of machine tools, and relates to a tool clamp for a machine tool.

Background

The machine tool comprises a machine body, a die and other parts, wherein the die needs to be hung to a set position on the machine body through a crane in the installation process, and is fixed on the machine body through a fastening mechanism, and when a workpiece is installed on the machine body, the die can be fixed through the fastening mechanism.

The prior fastening mechanism for fixing, for example, chinese patent literature data discloses a multi-station size-adjustable connecting rod processing device mounted on a machine tool turntable [ application number: 201120222850.8; authorized bulletin number: CN202147147U ], it includes a plurality of anchor clamps bases of being fixed in on the lathe carousel, and every anchor clamps base is concave to be equipped with a slider groove, installs a slider in its direction of elongation activity in the slider groove, and the both ends in slider groove are fixed connection with the adjusting block respectively, and the screw thread is equipped with a bolt that passes the adjusting block on every adjusting block, and the tip of every bolt supports to the lateral wall of slider, is equipped with a connecting portion on the slider, and the one end of connecting rod is installed on the connecting portion.

The processing device with the structure can move along the sliding block groove, so that the position of the connecting part can be changed, and the connecting part can be used for better fixing the connecting rod. However, in the machining device having such a structure, the connecting portion can move only in one direction, that is, along with the slider moving along the slide groove, and there is a problem in that the connecting rod cannot move to the set position. When the processing device with the structure is used for installing the die in the same way, the fixing columns are fixedly connected to the die in a protruding mode, the die is installed on the sliding block through the fixing columns and the connecting part, so that the die can be installed on a lathe body of a machine tool, a plurality of fixing columns are needed to be used for installing one die, namely, a plurality of processing devices are needed to be used, certain deviation exists in the positions of the fixing columns, the reasons of the positions of the die or the workpiece, the processing errors and other reasons, and the processing device with the structure cannot be accurately fixed.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides a tool clamp for a machine tool, which solves the technical problem of accurately adjusting the height of the tool clamp.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides a frock clamp for lathe, includes the base, its characterized in that still includes spliced pole, a pair of locking plate, first adjusting bolt and second adjusting bolt, the middle of spliced pole bottom has the connecting portion that downward bulge set up, the left and right sides of spliced pole bottom all has the step groove that the indentation set up, the step face slant in the step groove is located the top sets up downwards, the top of locking plate has the guide surface that slant in downwards slope set up, the locking plate slides and sets up on the base and the embedding sets up in the step groove that corresponds, the guide surface is laminated with the step face that corresponds mutually, have the regulation hole that runs through in the connecting portion, the aperture of regulation hole is greater than the external diameter of first adjusting bolt pole portion, first adjusting bolt passes regulation hole and a pair of locking plate, and rotatory first adjusting bolt makes the locking plate slide along the base and makes the spliced pole reciprocate through the locking plate, pass through the second adjusting bolt fixes the spliced pole on the base, the top of spliced pole has locking structure.

The bottom of mould or work piece has the fixed column that the protrusion set up, and the base is used for linking firmly with the lathe bed of lathe, and spliced pole and locking plate cooperate and are used for adjusting frock clamp's overall height, make locking structure can be accurate pin the fixed column to make the accurate locking of mould or work piece on the lathe. When the height of the tool clamp is adjusted, the second adjusting bolt is unscrewed firstly, the pair of locking plates are respectively embedded into the corresponding step grooves, the first adjusting bolt penetrates through one locking plate and the adjusting hole and then is in threaded connection with the other locking plate, at the moment, a certain distance is reserved between the inner side of the locking plate and the connecting part, the first adjusting bolt is screwed, the pair of locking plates are driven to move inwards, the aperture of the adjusting hole is larger than the outer diameter of the rod part of the first adjusting bolt, the first adjusting bolt can not obstruct the movement of the connecting column, the step surface and the guide surface are obliquely inwards and downwards inclined, through the cooperation of the step surface and the guide surface, the locking plates are contacted with the connecting column when moving inwards, a component force pushing the connecting column to move upwards is generated, the locking plates push the connecting column to move upwards, then the second adjusting bolt is screwed to enable the connecting column to be fixedly connected with the base, the locking plate is fastened on the base through pressure, accordingly, the locking structure is lifted, the first adjusting bolt is unscrewed, the pair of locking plates is driven to move outwards, the connecting column is moved downwards through the cooperation of the step surface and the guide surface, and then the second adjusting bolt is screwed down, and the connecting column is fastened on the base through the base. Through above-mentioned step regulation, adjust the position to locking structure, make locking structure remove in place, make locking structure lock the fixed column that can be better, step face and guide surface are the plane that the slope set up moreover, stagger how much through step face and guide surface and adjust the distance that locking structure moved, make locking structure can stop in optional position, improve locking structure's moving accuracy, improve frock clamp's locking accuracy.

In the tool fixture for the machine tool, the bottom of the locking plate is a plane, the top of the base is provided with a plane, and the bottom of the locking plate is attached to the plane at the top of the base. The locking plate is directly placed on the base, the contact surface is a plane, and the locking plate moves smoothly relative to the base, so that the whole height of the tool clamp is adjusted smoothly, the locking structure is moved in place, and the locking precision of the tool clamp is improved.

In the fixture for the machine tool, the front side and the rear side of the bottom of the connecting column are respectively provided with the first fixing holes which are obliquely arranged in a downward inclined mode, the cross sections of the first fixing holes are in a long strip shape, the length directions of the cross sections of the first fixing holes are arranged along the front and rear directions of the bottom of the connecting column, and the second adjusting bolts penetrate through the first fixing holes and penetrate through the base to fix the connecting column on the base. The cross section of the first fixing hole is in a strip shape, a certain margin is reserved, so that the problem of touch and clamping cannot occur when the second adjusting bolt penetrating through the first fixing hole moves up and down on the connecting column; simultaneously, the first fixing holes are obliquely inwards and downwards inclined, the second adjusting bolts are obliquely inwards and downwards inclined, the structure cannot occupy too much external space, the space occupied by the fixture is reduced, and the whole structure of the fixture is compact. In addition, the connecting column can translate a certain distance in the horizontal direction, so that the position of the locking structure in the horizontal direction can be adjusted, and the locking precision of the tool clamp is improved.

In the above-mentioned frock clamp for lathe, the regulation hole is located the center department of connecting portion, a pair of the first fixed orifices all pass the connecting portion, a pair of the first fixed orifices uses the regulation hole to set up as central symmetry. The structure ensures that the stress of the connecting column is most uniform when the connecting column moves and is fixed, and improves the stability of the connecting column, thereby improving the locking precision of the tool clamp.

As another aspect, in the above-mentioned tool fixture for a machine tool, the front and rear sides of the bottom of the connecting column are each provided with a first fixing hole arranged along the vertical direction, and the second adjusting bolt passes through the first fixing hole and penetrates into the base to fix the connecting column on the base. Simple structure and convenient manufacture.

In the fixture for the machine tool, the base comprises a bottom plate, an adjusting plate, a third adjusting bolt and a fourth adjusting bolt, wherein the bottom plate is provided with a concave installation groove, the adjusting plate is embedded in the installation groove, a gap is reserved between the front and back directions of the connecting column and the groove wall of the installation groove, the third adjusting bolt penetrates through the bottom plate and abuts against the adjusting plate in the front and back directions of the connecting column, the third adjusting bolt is rotated to enable the adjusting plate to move in the front and back directions of the connecting column, the adjusting plate is provided with a plurality of strip-shaped second fixing holes, the length directions of the second fixing holes are consistent with the front and back directions of the connecting column, the fourth adjusting bolt penetrates through the second fixing holes and penetrates into the bottom plate to enable the adjusting plate to be fixedly connected with the bottom plate, and the locking plate is placed on the adjusting plate and the connecting column is fixedly connected with the adjusting plate through the second adjusting bolt. The structure enables the adjusting plate to translate in the horizontal direction, and the position of the connecting column in the horizontal direction can be changed, so that the position of the locking structure in the horizontal direction can be adjusted, and the locking precision of the tool clamp is improved.

In the fixture for the machine tool, the mounting groove is positioned in the middle of the bottom plate, a plurality of arc-shaped third fixing holes are formed in the edge of the bottom plate, and the third fixing holes are arranged around the mounting groove. This kind of structure, after the base is installed on the lathe bed, can make the base rotate certain angle, can make the spliced pole rotate certain angle, make the spliced pole can rotate to arbitrary department in a small circle to can adjust the angle of locking structure in the horizontal direction, improve frock clamp's locking precision.

In the fixture for the machine tool, the locking structure comprises a plurality of fifth adjusting bolts and locking holes concavely arranged at the top of the connecting column, a plurality of dovetail grooves concavely arranged and communicated with the locking holes are formed in the wall of each locking hole, dovetail blocks are placed in the dovetail grooves, the fifth adjusting bolts penetrate through the connecting column and extend into the dovetail grooves, and the fifth adjusting bolts are rotated to push the dovetail blocks to move. The fixed column is embedded into the locking hole, the fifth adjusting bolt is screwed, the fifth adjusting bolt pushes the dovetail block to move to clamp the fixed column, the fixed column is locked in the locking hole, the die or the workpiece is fixed on the fixture, and the dovetail block can be prevented from falling off from the dovetail groove while moving according to the set direction by matching the dovetail groove with the dovetail block.

In the tool fixture for the machine tool, the dust baffle is arranged at the top of the dovetail groove, the bottom of the dust baffle is propped against the dovetail block, and the top of the dust baffle is flush with the top of the connecting column. The dust baffle prevents impurities from entering the dovetail groove, and simultaneously, the tool clamp can be tightly propped against the workpiece.

In the tool fixture for the machine tool, the circumferential outer side wall of the fixing column for locking the locking structure is provided with the locking groove which is concavely arranged in an annular shape, and the dovetail block is embedded into the locking groove and abuts against the upper groove wall and the lower groove wall of the locking groove. The structure improves the clamping force, so that the tool clamp and the workpiece cannot fall off after being locked.

Compared with the prior art, the tool clamp for the machine tool has the following advantages:

1. the position of the locking structure of the tool clamp in the vertical direction and the horizontal direction can be adjusted, so that the locking structure can be moved in place, the locking structure can better lock the fixed column, and the locking precision of the tool clamp is improved.

2. The locking plate of the tool clamp is directly placed on the adjusting plate, the locking plate is matched with the step surface of the connecting column through the guide surface obliquely arranged at the top, the lifting of the connecting column can be realized through rotating the first adjusting bolt, the locking structure can stay at any position, the design is ingenious, and the locking precision of the tool clamp is improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the tool clamp for the machine tool.

Fig. 2 is a sectional view of the tool clamp for the machine tool along the front-rear direction of the connecting column.

Fig. 3 is a cross-sectional view of the tool clamp for machine tool along the left-right direction of the connecting column.

Fig. 4 is an exploded view of the tool holder base for the machine tool.

Fig. 5 is a schematic structural view of the tool clamp connecting column and the locking structure for the machine tool.

In the figure, 1, a base; 11. a bottom plate; 111. a mounting groove; 112. a third fixing hole; 12. an adjusting plate; 121. a second fixing hole; 13. a third adjusting bolt; 14. a fourth adjusting bolt; 2. a connecting column; 21. a connection part; 211. an adjustment aperture; 22. a step groove; 221. a step surface; 23. a first fixing hole; 3. a locking plate; 31. a guide surface; 4. a first adjusting bolt; 5. a second adjusting bolt; 6. fixing the column; 61. a locking groove; 7. a locking structure; 71. a fifth adjusting bolt; 72. a locking hole; 73. a dovetail groove; 74. dovetail blocks; 75. a dust plate.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, the tool clamp for a machine tool includes a base 1, a connecting column 2, a pair of locking plates 3, a first adjusting bolt 4, and a second adjusting bolt 5.

The middle of the bottom of the connecting column 2 is provided with a connecting part 21 protruding downwards, as shown in fig. 2 and 3, the connecting part 21 is provided with a penetrating adjusting hole 211, the adjusting hole 211 is positioned at the center of the connecting part 21, and the aperture of the adjusting hole 211 is larger than the outer diameter of the rod part of the first adjusting bolt 4. The left and right sides of the bottom of the connecting column 2 are respectively provided with a recessed step groove 22, the two step grooves 22 are symmetrically arranged by taking the connecting part 21 as a center, and the step surfaces 221 of the step grooves 22 positioned at the top are obliquely inwards and downwards inclined. The top of the locking plate 3 is provided with a guiding surface 31 which is obliquely inwards and downwards obliquely arranged, the locking plate 3 is arranged on the base 1 in a sliding manner and is embedded into the corresponding step groove 22, the guiding surface 31 is attached to the corresponding step surface 221, and the first adjusting bolt 4 passes through one locking plate 3 and the adjusting hole 211 and is in threaded connection with the other locking plate 3.

In this embodiment, the front and rear sides of the bottom of the connecting post 2 are respectively provided with a first fixing hole 23 that is obliquely inclined inwards and downwards, the cross section of the first fixing hole 23 is in a long strip shape, the length direction of the cross section of the first fixing hole 23 is arranged along the front and rear direction of the bottom of the connecting post 2, a pair of first fixing holes 23 penetrate through the connecting portion 21, and the pair of first fixing holes 23 are symmetrically arranged with the adjusting hole 211 as a center. The second adjusting bolt 5 passes through the first fixing hole 23 and is inserted into the base 1 so that the connection post 2 is fixed to the base 1. In actual production, the front side and the rear side of the bottom of the connecting column 2 are respectively provided with a first fixing hole 23 arranged along the vertical direction, and the second adjusting bolt 5 passes through the first fixing holes 23 and passes through the base 1 to fix the connecting column 2 on the base 1.

As shown in fig. 4, the base 1 includes a bottom plate 11, an adjusting plate 12, a third adjusting bolt 13 and a fourth adjusting bolt 14, the bottom plate 11 has a concavely arranged mounting groove 111, the mounting groove 111 is located in the middle of the bottom plate 11, the adjusting plate 12 is embedded in the mounting groove 111, the adjusting plate 12 is arranged in a gap between the front-rear direction of the connecting column 2 and the groove wall of the mounting groove 111, the third adjusting bolt 13 passes through the bottom plate 11 in the front-rear direction of the connecting column 2 and abuts against the adjusting plate 12, and the third adjusting bolt 13 is rotated to move the adjusting plate 12 in the front-rear direction of the connecting column 2. In this embodiment, the adjusting plate 12 has two elongated second fixing holes 121, the length direction of the second fixing holes 121 is consistent with the front-rear direction of the connecting column 2, and the adjusting plate 12 and the base plate 11 are fixedly connected by passing the fourth adjusting bolt 14 through the second fixing holes 121 and passing through the base plate 11, and in actual production, the number of the second fixing holes 121 may be four or six.

The bottom of the locking plate 3 is a plane, the top of the adjusting plate 12 is provided with a plane, the bottom of the locking plate 3 is attached to the plane at the top of the adjusting plate 12, and the connecting column 2 is fixedly connected with the adjusting plate 12 through the second adjusting bolt 5. In this embodiment, four arc-shaped third fixing holes 112 are formed at the edge of the bottom plate 11, the third fixing holes 112 are disposed around the mounting groove 111, and in actual production, the number of the third fixing holes 112 may be three or six.

The top of the connecting post 2 has a locking structure 7 for locking the convexly arranged fixing post 6 on the workpiece. As shown in fig. 5, the locking structure 7 includes two fifth adjusting bolts 71 and a locking hole 72 concavely provided at the top of the connecting column 2, two dovetail grooves 73 concavely provided in the wall of the locking hole 72 and communicating with the locking hole 72, a dovetail block 74 is placed in the dovetail groove 73, a dust plate 75 is placed at the top of the dovetail groove 73, the bottom of the dust plate 75 abuts against the dovetail block 74, and the top of the dust plate 75 is flush with the top of the connecting column 2. The fixing column 6 has a locking groove 61 formed in a concave shape in the circumferential direction on the outer side wall, a fifth adjusting bolt 71 passes through the connecting column 2 and extends into the dovetail groove 73, and the fifth adjusting bolt 71 is rotated to push the dovetail block 74 to move, so that the dovetail block 74 is embedded into the locking groove 61 and abuts against the upper and lower groove walls of the locking groove 61.

During adjustment, the base 1 is rotated firstly, the angle of the connecting column 2 is changed, then the adjusting plate 12 is moved to change the horizontal position of the connecting column 2, then the locking plate is moved to change the height of the connecting column 2, after the position of the connecting column 2 is adjusted in place, the bottom plate 11, the second adjusting bolt 5 and the fourth adjusting bolt 14 are locked, a workpiece is lifted and moved through the crane, the fixing column 6 is embedded into the corresponding locking hole 72, and then the fifth adjusting bolt 71 is screwed, so that the dovetail block 74 locks the fixing column 6.

The first adjusting bolt 4 is rotated to enable the locking plate 3 to slide along the base 1 and drive the connecting column 2 to lift up and down through the locking plate 3, and the connecting column 2 is fixed on the base 1 through the second adjusting bolt 5.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Although terms of the base 1, the base plate 11, the mounting groove 111, the third fixing hole 112, the adjusting plate 12, the second fixing hole 121, the third adjusting bolt 13, the fourth adjusting bolt 14, the connecting post 2, the connecting portion 21, the adjusting hole 211, the stepped groove 22, the stepped surface 221, the first fixing hole 23, the locking plate 3, the guide surface 31, the first adjusting bolt 4, the second adjusting bolt 5, the fixing post 6, the locking groove 61, the locking structure 7, the fifth adjusting bolt 71, the locking hole 72, the dovetail groove 73, the dovetail block 74, the dust plate 75, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.

Claims

1. The utility model provides a frock clamp for lathe, includes base (1), its characterized in that still includes spliced pole (2), a pair of locking plate (3), first adjusting bolt (4) and second adjusting bolt (5), connecting portion (21) that have the downward bulge setting in the centre of spliced pole (2) bottom, the left and right sides of spliced pole (2) bottom all has recessed step groove (22) that set up, step groove (22) are located the slant of step face (221) at top and incline downwards and set up, the top of locking plate (3) has guide surface (31) that slant inwards inclines downwards and sets up, locking plate (3) slip sets up on base (1) and imbeds in corresponding step groove (22), guide surface (31) are laminated mutually with corresponding step face (221), have in connecting portion (21) run through regulation hole (211), the aperture of regulation hole (211) is greater than the external diameter of first adjusting bolt (4) pole portion, first adjusting bolt (4) pass through regulation hole (211) and a pair of locking plate (3) and make and slide down along locking plate (3) and make and slide on locking plate (1), the connecting column (2) is fixed on the base (1) through the second adjusting bolt (5), and the top of the connecting column (2) is provided with a locking structure (7).

2. The tool clamp for the machine tool according to claim 1, wherein the bottom of the locking plate (3) is a plane, the top of the base (1) is provided with a plane, and the bottom of the locking plate (3) is abutted against the plane of the top of the base (1).

3. The fixture for the machine tool according to claim 1, wherein the front side and the rear side of the bottom of the connecting column (2) are respectively provided with a first fixing hole (23) which is obliquely inwards and downwards obliquely arranged, the cross section of the first fixing hole (23) is in a strip shape, the length direction of the cross section of the first fixing hole (23) is arranged along the front and rear direction of the bottom of the connecting column (2), and the second adjusting bolt (5) penetrates through the first fixing hole (23) and penetrates through the base (1) to fix the connecting column (2) on the base (1).

4. A tool clamp for a machine tool according to claim 3, wherein the adjustment hole (211) is located at the center of the connecting portion (21), a pair of the first fixing holes (23) are each formed through the connecting portion (21), and the pair of the first fixing holes (23) are symmetrically arranged with the adjustment hole (211) as a center.

5. The tool fixture for the machine tool according to claim 1, wherein the front side and the rear side of the bottom of the connecting column (2) are respectively provided with a first fixing hole (23) which is arranged along the vertical direction, and the second adjusting bolt (5) passes through the first fixing holes (23) and passes through the base (1) so as to fix the connecting column (2) on the base (1).

6. The tool clamp for a machine tool according to any one of claims 1 to 5, wherein the base (1) comprises a bottom plate (11), an adjusting plate (12), a third adjusting bolt (13) and a fourth adjusting bolt (14), wherein the bottom plate (11) is provided with a concave mounting groove (111), the adjusting plate (12) is embedded in the mounting groove (111), a gap is reserved between the adjusting plate (12) and the groove wall of the mounting groove (111) along the front-back direction of the connecting column (2), the third adjusting bolt (13) penetrates through the bottom plate (11) along the front-back direction of the connecting column (2) and abuts against the adjusting plate (12), the adjusting plate (12) is moved along the front-back direction of the connecting column (2) by rotating the third adjusting bolt (13), the adjusting plate (12) is provided with a plurality of strip-shaped second fixing holes (121), the length direction of the second fixing holes (121) is consistent with the front-back direction of the connecting column (2), the fourth adjusting bolt (13) penetrates through the second adjusting bolt (12) and is fixedly arranged on the bottom plate (11) along the connecting column (12), the connecting column (2) is fixedly connected with the adjusting plate (12) through a second adjusting bolt (5).

7. The tool clamp for the machine tool according to claim 6, wherein the mounting groove (111) is located in the middle of the bottom plate (11), a plurality of arc-shaped third fixing holes (112) are formed in the edge of the bottom plate (11), and the third fixing holes (112) are arranged around the mounting groove (111).

8. The tool fixture for the machine tool according to any one of claims 1 to 5, wherein the locking structure (7) comprises a plurality of fifth adjusting bolts (71) and a locking hole (72) concavely arranged at the top of the connecting column (2), a plurality of dovetail grooves (73) concavely arranged in the hole wall of the locking hole (72) and communicated with the locking hole (72) are formed in the hole wall of the locking hole (72), dovetail blocks (74) are placed in the dovetail grooves (73), the fifth adjusting bolts (71) penetrate through the connecting column (2) and extend into the dovetail grooves (73), and the fifth adjusting bolts (71) are rotated to push the dovetail blocks (74) to move.

9. The tool clamp for the machine tool according to claim 8, wherein a dust plate (75) is arranged at the top of the dovetail groove (73), the bottom of the dust plate (75) is abutted against the dovetail block (74), and the top of the dust plate (75) is flush with the top of the connecting column (2).

10. The tool clamp for the machine tool according to claim 8, wherein a locking groove (61) which is arranged in an annular concave manner is formed in the circumferential outer side wall of the fixing column (6) for locking the locking structure (7), and the dovetail block (74) is embedded into the locking groove (61) and abuts against the upper groove wall and the lower groove wall of the locking groove (61).