CN213470785U - Locking device for pipe end of circular steel pipe - Google Patents

Abstract

The utility model discloses a circular steel pipe end locking device, it includes four screens piece, two first extension boards, a second extension board, a third extension board, a bottom plate, eight connecting rods, four cushions, four bearing frames, four rolls, two holders, a work nut, a branch, eight antifriction bearing, thirty two wheels, sixteen first hinges, sixteen second hinges, four third hinges, four first screw rods, four second screw rods, four third screw rods, four first nuts, four second nuts, four third nuts and a plurality of ball, the utility model discloses the device can be locked from the inside of circular steel pipe, has low in manufacturing cost, easy operation, the effectual characteristics of locking.

Description

Locking device for pipe end of circular steel pipe

Technical Field

The utility model belongs to the technical field of machinery, concretely relates to circular steel pipe end locking device.

Background

At present, a round steel pipe is widely applied to the fields of oil exploitation and pipeline transportation as an important product in the steel industry; quality defects such as pits, rough surfaces, protruding paths or oxide scales are generated on the outer surface of the round steel pipe due to quality problems on the surface of the roller, and in order to not affect the service performance of the round steel pipe, the surface defects need to be repaired, so that a device capable of locking the round steel pipe from the inside is required to be used as an auxiliary tool.

Document CN103264136A discloses a pipe end thickening device forming mold locking system, which mainly comprises an upper mold block, a lower mold block, a connecting plate, a locking block, a mandrel and a pushing cylinder, and is mainly used for upsetting and thickening the pipe end of a drill rod.

Document CN202667952U discloses a mechanical type bimetal composite pipe end seal welding lining tensioning device, which mainly comprises a base, a pressure plate and a plurality of equally-divided circumferential radial movement adjusting mechanisms, and the device has the characteristic of simple structure, and although the device can be locked from the inside of a steel pipe, the device needs to adjust the equally-divided circumferential radial movement adjusting mechanisms one by one, so that the operation of the device is relatively complicated.

SUMMERY OF THE UTILITY MODEL

To problem one or more that exist among the prior art, the utility model provides a circular steel pipe end locking device, it includes:

the device comprises four clamping blocks (1), two first support plates (2), one second support plate (7), one third support plate (11), one bottom plate (4), eight connecting rods (5), four cushion blocks (8), four bearing seats (9), four rollers (10), two retainers (12), one working nut (13), one support rod (14), eight rolling bearings (15), thirty-two wheels (17), sixteen first hinges (a3), sixteen second hinges (b3), four third hinges (c3), four first screws (a16), four second screws (b16), four third screws (c16), four first nuts (a6), four second nuts (b6), four third nuts (c6) and a plurality of balls (18); wherein:

the clamping block (1) is of a cuboid symmetrical structure, a cuboid fourth through hole (104) is formed in the center of the upper surface of the clamping block (1), and the connecting rod (5) penetrates through the fourth through hole (104); two cylindrical second through holes (102) are formed in the front side and the rear side of the fourth through hole (104), and a first hinge (a3) penetrates through the second through holes (102); the left end and the right end of the fourth through hole (104) are provided with four cuboid-shaped third through holes (103), and wheels (17) penetrate through the third through holes (103); two cylindrical first through holes (101) are formed in the front side and the rear side of each third through hole (103), and a second hinge (b3) penetrates through each first through hole (101);

the first support plate (2) is of a cross-plate-shaped symmetrical structure, four rectangular first grooves (201) are formed in four end portions of the first support plate (2), and the first grooves (201) are used for guiding rolling of the wheels (17); a cuboid-shaped fifth through hole (202) is formed in each first groove (201), and the connecting rod (5) penetrates through the fifth through hole (202); a cuboid-shaped sixth through hole (203) is formed in the center of the first support plate (2), and the support rod (14) penetrates through the sixth through hole (203); eight cylindrical seventh through holes (204) are formed around the sixth through hole (203), wherein a second screw (b16) penetrates through the four seventh through holes (204) positioned on the outer side, and a third screw (c16) penetrates through the other four seventh through holes (204) positioned on the inner side;

the second support plate (7) is of a cuboid plate-shaped symmetrical structure, and four cuboid-shaped first bosses (701) are arranged on four side surfaces of the second support plate (7); each first boss (701) is provided with a first rectangular through groove (704), and the connecting rod (5) penetrates through the first through groove (704); both sides of each first through groove (704) are provided with a cylindrical twelfth through hole (705), and a first hinge (a3) penetrates through the twelfth through hole (705); a cuboid tenth through hole (702) is formed in the center of the second support plate (7), and a clamping section (1402) of the support rod (14) penetrates through the tenth through hole (702); the periphery of the tenth through hole (702) is provided with four cylindrical eleventh through holes (703), and a first screw rod (a16) penetrates through the eleventh through holes (703);

the third support plate (11) is of a cuboid plate-shaped symmetrical structure, and four cuboid-shaped second bosses (1101) are formed in four side faces of the third support plate (11); each second boss (1101) is provided with a second rectangular through groove (1104), and the connecting rod (5) penetrates through the second rectangular through groove (1104); both sides of each second through groove (1104) are provided with a cylindrical seventeenth through hole (1105), and a first hinge (a3) penetrates through the seventeenth through hole (1105); a sixteenth through hole (1102) in a cuboid shape is formed in the center of the third support plate (11), and a clamping section (1402) of the support rod (14) penetrates through the sixteenth through hole (1102); a circular fourth groove (1103) is formed in the periphery of the sixteenth through hole (1102) along the circumferential direction, and the fourth groove (1103) is used for guiding the rolling of the ball (18); the distance between the centers of the two seventeenth through holes (1105) is equal to the distance between the centers of the two twelfth through holes (705);

the bottom plate (4) is of a rectangular plate-shaped symmetrical structure, the upper surface of the bottom plate (4) is provided with a second groove (402) in a regular octagonal shape, and a supporting section (1401) of the supporting rod (14) penetrates through the second groove (402); four corners of the bottom plate (4) are provided with four cylindrical eighth through holes (401), and a first screw rod (a16) penetrates through the eighth through holes (401);

the connecting rod (5) is of a cuboid symmetrical structure, both ends of the connecting rod (5) are provided with a cylindrical ninth through hole (501), and a first hinge (a3) penetrates through the ninth through hole (501);

the cushion block (8) is of a cuboid-shaped symmetrical structure, two cylinder-shaped thirteenth through holes (801) are formed in the cushion block (8), a second screw (b16) penetrates through one thirteenth through hole (801), and a third screw (c16) penetrates through the other thirteenth through hole (801);

the bearing seat (9) comprises a main body (903) and two outer edges (901), wherein the two outer edges (901) are respectively arranged on the left side and the right side of the main body (903); the main body (903) is symmetrically provided with two cylindrical third grooves (904) with axes arranged along the horizontal direction, and rolling bearings (15) are mounted in the third grooves (904); a fourteenth cylindrical through hole (902) is formed in the axis position of each third groove (904), and a roller head (1001) of the roller (10) penetrates through the fourteenth through hole (902); each outer edge (901) is provided with a cylindrical fifteenth through hole (905), and a third screw (c16) penetrates through the fifteenth through hole (905);

the roller (10) comprises roller heads (1001) at two ends and a roller body (1002) in the middle; the roller head (1001) is of a cylindrical symmetrical structure and is used for penetrating the rolling bearing (15); the roller body (1002) is of a cylindrical symmetrical structure, an annular roller groove (1003) is formed in the circumferential direction of the roller body (1002), the longitudinal section of the roller groove (1003) is rectangular, and the supporting rod (14) penetrates through the roller groove (1003);

the retainer (12) is of a cuboid plate-shaped symmetrical structure, a cylindrical nineteenth through hole (1203) is formed in the axis position of the retainer (12), and the support rod (14) penetrates through the nineteenth through hole (1203); the retainer (12) is uniformly provided with a plurality of spherical pockets (1202) along the circumferential direction, and balls (18) are placed in the pockets (1202); four corners of the retainer (12) are provided with four cylindrical eighteenth through holes (1201), and third hinges (c3) penetrate through the eighteenth through holes (1201); the two retainers (12) form a group, and a plurality of balls (18) are wrapped at equal intervals and used for isolating and driving the balls (18) to roll;

the working nut (13) is of a cylindrical symmetrical structure, a circular fifth groove (1301) is formed in the lower surface of the working nut (13) in the circumferential direction, and the fifth groove (1301) is used for guiding rolling of the ball (18); a cylindrical sixth groove (1302) is formed in the axis position of the lower surface of the working nut (13), a cylindrical screw hole (1303) is formed in the sixth groove (1302) along the axis direction, and a threaded section (1403) of the support rod (14) is screwed in the screw hole (1303);

the strut (14) comprises a supporting section (1401), a blocking section (1402) and a threaded section (1403) which are coaxially connected; the supporting section (1401) is of a regular octagonal symmetrical structure, the clamping section (1402) is of a rectangular symmetrical structure, the thread section (1403) is of a cylindrical symmetrical structure, and the outer surface of the cylinder is provided with threads for screwing the working nut (13);

the rolling bearing (15), the wheel (17), the first hinge (a3), the second hinge (b3), the third hinge (c3), the first screw (a16), the second screw (b16), the third screw (c16), the first nut (a6), the second nut (b6), the third nut (c6) and the ball (18) are all standard parts.

The circular steel pipe end locking device provided based on the technical scheme comprises four clamping blocks, two first support plates, a second support plate, a third support plate, a bottom plate, eight connecting rods, four cushion blocks, four bearing seats, four rollers, two retainers, a working nut, a support rod, eight rolling bearings, thirty-two wheels, sixteen first hinges, sixteen second hinges, four third hinges, four first screw rods, four second screw rods, four third screw rods, four first nuts, four second nuts, four third nuts and a plurality of balls, and can lock a circular steel pipe from the inside. The utility model adopts a labor-saving structural design, and can realize the amplification of force through the transmission of force twice; the supporting rod is axially positioned by using a roller, and the stable locking can be realized by eight line contacts by means of the elastic deformation of the round steel pipe. Compared with the prior art, the method has the following beneficial effects:

1) when the device is used, the device only needs to be placed inside a circular steel pipe, the axis of the supporting rod is kept parallel to the axis of the circular steel pipe, the working nut is screwed in at a constant speed, the torsional force from the circumferential direction forces the holder to rotate along the fourth groove of the third support plate, and the pressure from the axis direction forces the connecting rod to push out the four clamping blocks simultaneously and contact the inner wall of the circular steel pipe, so that the locking task is completed; in the same way, the working nut is screwed out at a constant speed, the four clamping blocks are simultaneously pulled in through the connecting rod and leave the inner wall of the round steel pipe to complete the unlocking task, so the device of the utility model is relatively simple to operate;

2) the utility model adopts a symmetrical structural design, the working nut is screwed with the support rod through the screw thread, and the first amplification of the acting force can be realized; the clamping block, the connecting rod, the second support plate and the third support plate are used in a combined mode, and the second amplification of acting force can be achieved; the roller can axially position the supporting rod, the retainer and the balls are matched to use, so that the torsion force from the circumferential direction can be dissolved, and then only the pressure from the axis direction is transmitted, the four clamping blocks are arranged in a cross shape, and eight vertical edges on four sides can be in line contact with the inner wall of the circular steel pipe, so that the locking effect of the device is relatively good;

to sum up, the utility model discloses the device has low in manufacturing cost, easy operation, the effectual characteristics of locking.

Drawings

FIG. 1 is a schematic front view of a locking device for the end of a circular steel pipe;

FIG. 2 is a left side view schematic structural diagram of the circular steel pipe end locking device;

FIG. 3 is a schematic top view of the locking device for the end of the round steel pipe;

FIG. 4 is a schematic structural diagram of a circular steel pipe end locking device viewed from above after a working nut is removed;

FIG. 5 is a schematic top view of the assembled first plate, chock, roller and strut;

FIG. 6 is a front view of the assembled capture block, wheel and second hinge;

FIG. 7 is a left side view of the assembled capture block, wheel and second hinge;

FIG. 8 is a schematic top view of the assembled capture block, wheel and second hinge;

FIG. 9 is a top view of the first plate;

FIG. 10 is a schematic top view of the base plate;

FIG. 11 is a front view of the connecting rod;

FIG. 12 is a front view of the second plate;

FIG. 13 is a top view of the second plate;

FIG. 14 is a schematic top view of the spacer;

FIG. 15 is a front view of the bearing seat and the rolling bearing assembly;

FIG. 16 is a schematic top view of the bearing seat;

FIG. 17 is a left side view schematic of the roll;

FIG. 18 is a front view of a third plate;

FIG. 19 is a top view of the third plate;

FIG. 20 is a top view of the assembled cage, ball and third hinge;

FIG. 21 is a schematic bottom view of the work nut;

FIG. 22 is a front view of the strut;

FIG. 23 is a schematic structural view of a circular steel pipe end locking device when locking a circular steel pipe;

FIG. 24 is a schematic structural view of a working frame of the circular steel pipe end locking device;

FIG. 25 is a schematic view of the working principle of the locking device for the end of the round steel pipe;

description of reference numerals: 1-a block of bits; 101-a first via; 102-a second via; 103-a third via; 104-a fourth via; 2-a first plate; 201-a first groove; 202-fifth via; 203-sixth via; 204-a seventh via; a 3-first hinge; b 3-second hinge; c 3-third hinge; 4-a bottom plate; 401-eighth via; 402-a second groove; 5-a connecting rod; 501-a ninth via; a6 — first nut; b 6-second nut; c 6-third nut; 7-a second plate; 701-a first boss; 702-a tenth via; 703-an eleventh through hole; 704-a first through slot; 705-twelfth through hole; 8-cushion block; 801-thirteenth via; 9-bearing seats; 901-outer edge; 902-a fourteenth via; 903-a main body; 904-third groove; 905-a fifteenth via; 10-rolling; 1001-roller head; 1002-roll body; 1003-roller groove; 11-a third plate; 1101-a second boss; 1102-sixteenth through hole; 1103-a fourth groove; 1104-a second through slot; 1105-a seventeenth via; 12-a cage; 1201-eighteenth via; 1202-pocket; 1203-nineteenth via hole; 13-a working nut; 1301-a fifth groove; 1302-a sixth groove; 1303-screw holes; 14-a strut; 1401-a support section; 1402-a card bit section; 1403-thread segment; 15-rolling bearings; a 16-first screw; b 16-second screw; c 16-third screw; 17-wheels; 18-a ball bearing; 19-round steel tube.

Detailed Description

The following describes the present invention in detail with reference to the accompanying drawings. It should be understood that the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

As shown in fig. 1 to 5, the utility model provides a circular steel pipe end locking device includes: the clamping device comprises four clamping blocks 1, two first support plates 2, a second support plate 7, a third support plate 11, a bottom plate 4, eight connecting rods 5, four cushion blocks 8, four bearing blocks 9, four rollers 10, two retainers 12, a working nut 13, a support rod 14, eight rolling bearings 15, thirty-two wheels 17, sixteen first hinges a3, sixteen second hinges b3, four third hinges c3, four first screws a16, four second screws b16, four third screws c16, four first nuts a6, four second nuts b6, four third nuts c6 and a plurality of balls 18.

As shown in fig. 6 to 8, the position-retaining block 1 is made of a metal material and has a rectangular parallelepiped symmetrical structure; a rectangular fourth through hole 104 is formed in the center of the upper surface of the clamping block 1, and the connecting rod 5 penetrates through the fourth through hole 104; two cylindrical second through holes 102 are formed in the front side and the rear side of the fourth through hole 104, and a first hinge a3 penetrates through the second through holes 102; the left end and the right end of the fourth through hole 104 are provided with four cuboid-shaped third through holes 103, and wheels 17 penetrate through the third through holes 103; two first cylindrical through holes 101 are formed in the front side and the rear side of each third through hole 103, and a second hinge b3 penetrates through the first through holes 101.

As shown in fig. 9, the first support plate 2 is made of a metal material and has a cross-shaped plate-shaped symmetrical structure; four rectangular first grooves 201 are formed in four end portions of the first support plate 2, and the first grooves 201 are used for guiding the rolling of the wheels 17; a cuboid fifth through hole 202 is formed in each first groove 201, and the connecting rod 5 penetrates through the fifth through hole 202; a sixth through hole 203 in a rectangular parallelepiped shape is formed in the center of the first support plate 2, and the support rod 14 is inserted into the sixth through hole 203; eight cylindrical seventh through holes 204 are formed around the sixth through hole 203, wherein a second screw b16 penetrates through the four seventh through holes 204 located on the outer side, and a third screw c16 penetrates through the other four seventh through holes 204 located on the inner side.

As shown in fig. 12 and 13, the second support plate 7 is made of a metal material and has a symmetric structure of a rectangular parallelepiped plate shape; four rectangular first bosses 701 are arranged on four side surfaces of the second support plate 7, each first boss 701 is provided with a rectangular first through groove 704, and the connecting rod 5 penetrates through the first through groove 704; a cylindrical twelfth through hole 705 is formed in each of the two sides of each first through groove 704, and a first hinge a3 penetrates through the twelfth through hole 705; a tenth through hole 702 in a rectangular parallelepiped shape is formed in the center of the second support plate 7, and a clamping section 1402 of the support rod 14 is inserted into the tenth through hole 702; four cylindrical eleventh through holes 703 are formed around the tenth through hole 702, and a first screw a16 penetrates through the eleventh through hole 703.

As shown in fig. 18 and 19, the third plate 11 is made of a metal material and has a symmetric structure of a rectangular parallelepiped plate shape; four rectangular second bosses 1101 are arranged on four side surfaces of the third support plate 11, each second boss 1101 is provided with a rectangular second through groove 1104, and the connecting rod 5 penetrates through the second through groove 1104; both sides of each second through groove 1104 are provided with a cylindrical seventeenth through hole 1105, and a first hinge a3 penetrates through the seventeenth through hole 1105; a sixteenth through hole 1102 in a rectangular shape is formed in the center of the third support plate 11, and a clamping section 1402 of the support rod 14 penetrates through the sixteenth through hole 1102; a circular fourth groove 1103 is formed in the periphery of the sixteenth through hole 1102 along the circumferential direction, and the fourth groove 1103 is used for guiding the rolling of the ball 18; the distance between the centers of the seventeenth through holes 1105 is equal to the distance between the centers of the twelfth through holes 705.

As shown in fig. 10, the bottom plate 4 is made of a metal material and has a symmetric structure of a rectangular parallelepiped plate shape; the upper surface of the bottom plate 4 is provided with a second groove 402 in the shape of a regular octagon, and a supporting section 1401 of the supporting rod 14 is arranged in the second groove 402 in a penetrating manner; four cylindrical eighth through holes 401 are formed at four corners of the bottom plate 4, and a first screw a16 is inserted into the eighth through holes 401.

As shown in fig. 11, the connecting rod 5 is made of a metal material and has a rectangular parallelepiped symmetrical structure; both ends of the connecting rod 5 are provided with a cylindrical ninth through hole 501, and a first hinge a3 penetrates through the ninth through hole 501.

As shown in fig. 14, the spacer 8 is made of a metal material and has a rectangular parallelepiped symmetrical structure; the cushion block 8 is provided with two thirteenth cylindrical through holes 801, wherein a second screw b16 penetrates through one thirteenth through hole 801, and a third screw c16 penetrates through the other thirteenth through hole 801.

As shown in fig. 15 and 16, the bearing seat 9 is made of a metal material, and includes a main body 903 and two outer edges 901, where the two outer edges 901 are respectively disposed at the left and right sides of the main body 903; the main body 903 is symmetrically provided with two cylindrical third grooves 904, the axes of which are arranged along the horizontal direction, and rolling bearings 15 are mounted in the third grooves 904; a fourteenth cylindrical through hole 902 is formed in the axial position of each third groove 904, and a roller head 1001 of the roller 10 penetrates through the fourteenth through hole 902; each outer edge 901 is provided with a cylindrical fifteenth through hole 905, and a third screw c16 penetrates through the fifteenth through hole 905.

As shown in fig. 17, the roll 10 is made of a metal material, and includes a roll head 1001 at both ends and a roll body 1002 in the middle; the roller head 1001 is a cylindrical symmetrical structure and is used for penetrating the rolling bearing 15; the roller body 1002 is a cylindrical symmetrical structure, an annular roller groove 1003 is formed in the circumferential direction of the roller body 1002, the longitudinal section of the roller groove 1003 is rectangular, and the supporting rod 14 penetrates through the roller groove 1003.

As shown in fig. 20, the holder 12 is made of a metal material and has a rectangular parallelepiped plate-shaped symmetrical structure; a nineteenth through hole 1203 in a cylindrical shape is formed in the axis position of the retainer 12, and the supporting rod 14 penetrates through the nineteenth through hole 1203; the cage 12 is uniformly provided with a plurality of spherical pockets 1202 along the circumferential direction, and the balls 18 are placed in the pockets 1202; four corners of the retainer 12 are provided with four cylindrical eighteenth through holes 1201, and third hinges c3 penetrate through the eighteenth through holes 1201; the two retainers 12 are a group, and are wrapped with a plurality of balls 18 at equal intervals to isolate and drive the balls 18 to roll.

As shown in fig. 21, the working nut 13 is made of a metal material and has a cylindrical symmetrical structure; the lower surface of the working nut 13 is provided with an annular fifth groove 1301 along the circumferential direction, and the fifth groove 1301 is used for guiding the rolling of the ball 18; the axis position of the lower surface of the working nut 13 is provided with a cylindrical sixth groove 1302, a cylindrical screw hole 1303 is formed in the sixth groove 1302 along the axis direction, and the threaded section 1403 of the support rod 14 is screwed in the screw hole 1303.

As shown in fig. 22, the strut 14 is made of a metal material and includes a support section 1401, a locking section 1402 and a threaded section 1403 which are coaxially connected; the supporting section 1401 is a regular octagonal symmetrical structure, the clamping section 1402 is a rectangular symmetrical structure, the threaded section 1403 is a cylindrical symmetrical structure, and threads are formed in the outer surface of the cylinder and used for screwing the working nut 13.

The rolling bearing 15, the wheel 17, the first hinge a3, the second hinge b3, the third hinge c3, the first screw a16, the second screw b16, the third screw c16, the first nut a6, the second nut b6, the third nut c6 and the ball 18 are all standard parts.

The utility model provides a circular steel pipe end locking device's assembly method: as shown in fig. 1 to 22, first, two wheels 17 are respectively inserted into sixteen third through holes 103 of four clamping blocks 1, so as to ensure that thirty-two axle center holes of the wheels 17 are aligned with sixteen first through holes 101 of the four clamping blocks 1, and then one second hinge b3 is respectively installed in sixteen groups of aligned through holes, so that four clamping blocks 1 and thirty-two wheels 17 can be assembled into four clamping trolleys;

then, installing one rolling bearing 15 in each of eight third grooves 904 of four bearing blocks 9, arranging the four bearing blocks 9 in pairs in an opposite manner, and then respectively penetrating eight roller heads 1001 at two ends of four rollers 10 into the eight rolling bearings 15 arranged in an opposite manner, so that the four bearing blocks 9, the eight rolling bearings 15 and the four rollers 10 can be assembled;

then, the first grooves 201 of the two first supporting plates 2 are oppositely arranged, then one clamping trolley is respectively placed in four groups of the oppositely arranged first grooves 201, then the four cushion blocks 8 are placed between the two first supporting plates 2, four thirteenth through holes 801 of the four cushion blocks 8 and four seventh through holes 204 of the two first supporting plates 2 which are positioned at the outer sides are aligned, then the second screw b16 is respectively arranged in the through holes in the four groups of the alignment in a penetrating manner, and then the other ends of the four second screw b16 are respectively screwed with one second nut b 6; then, two groups of the bearing seats 9 are respectively placed on the two first support plates 2, eight fifteenth through holes 905 of the two groups of the bearing seats 9 can be simultaneously aligned with the other four thirteenth through holes 801 of the four cushion blocks 8 and the four seventh through holes 204 of the two first support plates 2 on the inner side, then a third screw c16 is respectively arranged in the through holes in the four groups of the alignment through holes in a penetrating manner, and then a third nut c6 is respectively screwed on the other ends of the four third screws c16, so that the four clamping blocks 1, the two first support plates 2, the four cushion blocks 8 and the two groups of the bearing seats 9 can be assembled;

then, one end of each of the four connecting rods 5 is respectively inserted into the four first through grooves 704 of the second support plate 7, so that the four ninth through holes 501 of the four connecting rods 5 are aligned with the four twelfth through holes 705 of the second support plate 7, then, one first hinge a3 is respectively installed in the through holes in the four pairs, then the other ends of the four connecting rods 5 firstly pass through the four fifth through holes 202 of the first support plate 2 at the lower position and further pass through the four fourth through holes 104 of the four clamping blocks 1, so as to ensure that the other four ninth through holes 501 of the four connecting rods 5 are aligned with the four second through holes 102 of the four clamping blocks 1 at the lower position, then, one first hinge a3 is arranged in each of the four pairs of through holes, so that four connecting rods 5, four clamping blocks 1 and the second support plate 7 can be assembled;

then, one ends of the other four connecting rods 5 are respectively arranged in the four second through grooves 1104 of the third support plate 11 in a penetrating manner, so that the four ninth through holes 501 of the four connecting rods 5 are aligned with the four seventeenth through holes 1105 of the third support plate 11, then, one first hinge a3 is respectively installed in the through holes in the four pairs, then the other ends of the four connecting rods 5 firstly pass through the four fifth through holes 202 of the first support plate 2 at the upper position and further pass through the four fourth through holes 104 of the four clamping blocks 1, so as to ensure that the other four ninth through holes 501 of the four connecting rods 5 are aligned with the four second through holes 102 of the four clamping blocks 1 at the upper position, then, one first hinge a3 is arranged in each of the four pairs of through holes, so that the other four connecting rods 5, the four clamping blocks 1 and the third support plate 11 can be assembled;

then, the pockets 1202 of one of the cages 12 are placed with their openings facing upward on the mounting table, and then one of the balls 18 is placed inside each pocket 1202, and then the pockets 1202 of the other cage 12 are placed with their openings facing downward on the cage 12, so that the four eighteenth through holes 1201 of the two cages 12 are aligned, and then one of the third hinges c3 is installed inside each of the four aligned through holes, so that the two cages 12 and a plurality of the balls 18 can be assembled;

then, the clamping section 1402 of the supporting rod 14 sequentially passes through the tenth through hole 702 of the second supporting plate 7, the sixth through holes 203 of the two first supporting plates 2 and the sixteenth through hole 1102 of the third supporting plate 11, and is further located in a hole pattern formed by the roller grooves 1003 of the four rollers 10, then the opening of the second groove 402 of the bottom plate 4 is placed upwards on the mounting table, then the supporting section 1401 of the supporting rod 14 is arranged in the second groove 402 of the bottom plate 4 in a penetrating manner, so that four eighth through holes 401 of the bottom plate 4 are aligned with four eleventh through holes 703 of the second supporting plate 7, then one first screw a16 is arranged in each of the four aligned through holes, then one first nut a6 is screwed on each of the other ends of the four first screws a16, and then two retainers 12 are sleeved on the clamping section 1402 of the supporting rod 14 through a nineteenth through hole 1203, finally, the opening of the sixth recess 1302 of the working nut 13 is screwed down onto the threaded section 1403 of the supporting rod 14, so that the complete device is assembled and ready for use.

The utility model provides a circular steel pipe end locking device's application method: as shown in fig. 23, firstly, the circular steel tube 19 is vertically placed with its opening facing upward, then the assembled whole set of device is inserted into the circular steel tube 19, then the axis of the supporting rod 14 is kept parallel to the axis of the circular steel tube 19, and then the working nut 13 is screwed in at a constant speed, at this time, the retainer 12 is subjected to two acting forces, namely a torsion force from the circumferential direction and a pressure force from the axial direction; the torsion force from the circumferential direction causes the ball 18 to roll in the fourth groove 1103 of the third support plate 11, and at this time, the pressure applied to the second support plate 7 and the third support plate 11 from the axial direction is gradually increased, and the four clamping blocks 1 can be simultaneously pushed out by the eight connecting rods 5 and contact the inner wall of the circular steel pipe 19, so that the locking task of the circular steel pipe 19 is completed;

similarly, the working nut 13 is screwed out at a constant speed, and the retainer 12 is subjected to two acting forces, namely a torsion force from the circumferential direction and a pressure force from the axial direction; the torsion force from the circumferential direction causes the ball 18 to roll within the fourth groove 1103 of the third fulcrum plate 11, and at this time, the pressure applied to the second fulcrum plate 7 and the third fulcrum plate 11 from the axial direction is gradually reduced, and the four clamping blocks 1 can be simultaneously drawn in through the eight connecting rods 5 and separated from the inner wall of the circular steel pipe 19, thereby completing the task of unlocking the circular steel pipe.

The utility model provides a circular steel pipe end locking device's theory of operation: as shown in fig. 24 and 25, the four opposite connecting rods 5, the second support plate 7 and the third support plate 11 can form two movable isosceles trapezoid frames, ABCD and TSRQ, where the point a, the point B, the point C, the point D, the point T, the point S, the point R and the point Q are hole centers of eight ninth through holes 501 of the four connecting rods 5; the device is designed in a symmetrical structure, a line segment AB is the hole center distance between two seventeenth through holes 1105 of the third support plate 11, a line segment TS is the hole center distance between two twelfth through holes 705 of the second support plate 7, and the hole center distance between the two seventeenth through holes 1105 is equal to the hole center distance between the two twelfth through holes 705, so that an outgoing line segment AB is inferred to be the line segment TS, further two isosceles trapezoid frames ABCD and TSRQ are inferred to be identical, further the outgoing line segment AT is inferred to be perpendicular to the line segment GH and the line segment UV AT the same time, and intersection points are respectively a point E and a point M; the line segment BS is also perpendicular to the line segment GH and the line segment UV, and the intersection points are a point F and a point N respectively;

according to the decision theorem of rectangles (a parallelogram with one corner as a right angle is a rectangle), it can be inferred that the quadrangles ABFE and TSNM are both rectangles, and further, it can be inferred that the outgoing line section AE is the line section BF, TM, SN, and the line section AB is the line section EF, TS, MN; the line segment AD, the line segment BC, the line segment TQ, and the line segment SR are hole center distances between the two ninth through holes 501 of the connecting rod 5, so that the line segment AD, the line segment BC, the line segment TQ, and the line segment SR can be estimated, and according to the judgment theorem of the congruent triangles (two congruent triangles, one hypotenuse and one squareness correspond to the same), the four congruent triangles AED, BFC, TMQ, and SNR can be estimated, so that the line segment DE, the line segment CF, the line segment QM, and the line segment RN can be estimated; because the clamping block 1 is of a cuboid-shaped symmetrical structure, according to the judgment theorem of a rectangle (a parallelogram with a right angle at one corner is a rectangle), the quadrangles GDQU and HCRV can be inferred to be both rectangles, and further, the outlet section GD can be inferred to be a line section HC; because the distances between the parallel lines are equal everywhere, the outgoing line section DQ or EM or FN or CR can be deduced;

in summary, the line segment AT is 2 line segment AE + line segment DQ, and the line segment GH is 2 line segment GD +2 line segment DE + line segment AB, where the line segment DQ is the hole center distance between the two second through holes 102 of the detent block 1, the line segment GD is the distance from the second through hole 102 to the left side surface of the detent block 1, and the line segment AB is the hole center distance between the two seventeenth through holes 1105 of the third support plate 11, and therefore, the line segments DQ, GD, and AB are all invariant, and only the line segment AE and DE are variable;

according to the Pythagorean theorem, in a right-angled triangle AED, the line segment AD²Line segment AE²+ line segment DE²Because the line segment AD is the hole center distance between the two ninth through holes 501 of the connecting rod 5, that is, the line segment AD is an invariant, when the line segment AE decreases, the line segment DE increases correspondingly, and the four positioning blocks 1 can be pushed out simultaneously to complete the locking task of the circular steel tube 19; on the contrary, when the line segment AE increases, the line segment DE decreases accordingly, and the four positioning blocks 1 can be pulled in simultaneously, so as to unlock the circular steel pipe 19.

Can see through the embodiment, the utility model discloses the device can realize locking from the inside of circular steel pipe, has low in manufacturing cost, easy operation, locks effectual characteristics.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A circular steel pipe end locking device, characterized in that, circular steel pipe end locking device includes:

the device comprises four clamping blocks (1), two first support plates (2), one second support plate (7), one third support plate (11), one bottom plate (4), eight connecting rods (5), four cushion blocks (8), four bearing seats (9), four rollers (10), two retainers (12), one working nut (13), one support rod (14), eight rolling bearings (15), thirty-two wheels (17), sixteen first hinges (a3), sixteen second hinges (b3), four third hinges (c3), four first screws (a16), four second screws (b16), four third screws (c16), four first nuts (a6), four second nuts (b6), four third nuts (c6) and a plurality of balls (18); wherein:

the clamping block (1) is of a cuboid symmetrical structure, a cuboid fourth through hole (104) is formed in the center of the upper surface of the clamping block (1), and the connecting rod (5) penetrates through the fourth through hole (104); two cylindrical second through holes (102) are formed in the front side and the rear side of the fourth through hole (104), and a first hinge (a3) penetrates through the second through holes (102); the left end and the right end of the fourth through hole (104) are provided with four cuboid-shaped third through holes (103), and wheels (17) penetrate through the third through holes (103); two cylindrical first through holes (101) are formed in the front side and the rear side of each third through hole (103), and a second hinge (b3) penetrates through each first through hole (101);

the first support plate (2) is of a cross-plate-shaped symmetrical structure, four rectangular first grooves (201) are formed in four end portions of the first support plate (2), and the first grooves (201) are used for guiding rolling of the wheels (17); a cuboid-shaped fifth through hole (202) is formed in each first groove (201), and the connecting rod (5) penetrates through the fifth through hole (202); a cuboid-shaped sixth through hole (203) is formed in the center of the first support plate (2), and the support rod (14) penetrates through the sixth through hole (203); eight cylindrical seventh through holes (204) are formed around the sixth through hole (203), wherein a second screw (b16) penetrates through the four seventh through holes (204) positioned on the outer side, and a third screw (c16) penetrates through the other four seventh through holes (204) positioned on the inner side;

the second support plate (7) is of a cuboid plate-shaped symmetrical structure, and four cuboid-shaped first bosses (701) are arranged on four side surfaces of the second support plate (7); each first boss (701) is provided with a first rectangular through groove (704), and the connecting rod (5) penetrates through the first through groove (704); both sides of each first through groove (704) are provided with a cylindrical twelfth through hole (705), and a first hinge (a3) penetrates through the twelfth through hole (705); a cuboid tenth through hole (702) is formed in the center of the second support plate (7), and a clamping section (1402) of the support rod (14) penetrates through the tenth through hole (702); the periphery of the tenth through hole (702) is provided with four cylindrical eleventh through holes (703), and a first screw rod (a16) penetrates through the eleventh through holes (703);

the third support plate (11) is of a cuboid plate-shaped symmetrical structure, and four cuboid-shaped second bosses (1101) are formed in four side faces of the third support plate (11); each second boss (1101) is provided with a second rectangular through groove (1104), and the connecting rod (5) penetrates through the second rectangular through groove (1104); both sides of each second through groove (1104) are provided with a cylindrical seventeenth through hole (1105), and a first hinge (a3) penetrates through the seventeenth through hole (1105); a sixteenth through hole (1102) in a cuboid shape is formed in the center of the third support plate (11), and a clamping section (1402) of the support rod (14) penetrates through the sixteenth through hole (1102); a circular fourth groove (1103) is formed in the periphery of the sixteenth through hole (1102) along the circumferential direction, and the fourth groove (1103) is used for guiding the rolling of the ball (18); the distance between the centers of the two seventeenth through holes (1105) is equal to the distance between the centers of the two twelfth through holes (705);

the bottom plate (4) is of a rectangular plate-shaped symmetrical structure, the upper surface of the bottom plate (4) is provided with a second groove (402) in a regular octagonal shape, and a supporting section (1401) of the supporting rod (14) penetrates through the second groove (402); four corners of the bottom plate (4) are provided with four cylindrical eighth through holes (401), and a first screw rod (a16) penetrates through the eighth through holes (401);

the connecting rod (5) is of a cuboid symmetrical structure, both ends of the connecting rod (5) are provided with a cylindrical ninth through hole (501), and a first hinge (a3) penetrates through the ninth through hole (501);

the cushion block (8) is of a cuboid-shaped symmetrical structure, two cylinder-shaped thirteenth through holes (801) are formed in the cushion block (8), a second screw (b16) penetrates through one thirteenth through hole (801), and a third screw (c16) penetrates through the other thirteenth through hole (801);

the bearing seat (9) comprises a main body (903) and two outer edges (901), wherein the two outer edges (901) are respectively arranged on the left side and the right side of the main body (903); the main body (903) is symmetrically provided with two cylindrical third grooves (904) with axes arranged along the horizontal direction, and rolling bearings (15) are mounted in the third grooves (904); a fourteenth cylindrical through hole (902) is formed in the axis position of each third groove (904), and a roller head (1001) of the roller (10) penetrates through the fourteenth through hole (902); each outer edge (901) is provided with a cylindrical fifteenth through hole (905), and a third screw (c16) penetrates through the fifteenth through hole (905);

the roller (10) comprises roller heads (1001) at two ends and a roller body (1002) in the middle; the roller head (1001) is of a cylindrical symmetrical structure and is used for penetrating the rolling bearing (15); the roller body (1002) is of a cylindrical symmetrical structure, an annular roller groove (1003) is formed in the circumferential direction of the roller body (1002), the longitudinal section of the roller groove (1003) is rectangular, and the supporting rod (14) penetrates through the roller groove (1003);

the retainer (12) is of a cuboid plate-shaped symmetrical structure, a cylindrical nineteenth through hole (1203) is formed in the axis position of the retainer (12), and the support rod (14) penetrates through the nineteenth through hole (1203); the retainer (12) is uniformly provided with a plurality of spherical pockets (1202) along the circumferential direction, and balls (18) are placed in the pockets (1202); four corners of the retainer (12) are provided with four cylindrical eighteenth through holes (1201), and third hinges (c3) penetrate through the eighteenth through holes (1201); the two retainers (12) form a group, and a plurality of balls (18) are wrapped at equal intervals and used for isolating and driving the balls (18) to roll;

the working nut (13) is of a cylindrical symmetrical structure, a circular fifth groove (1301) is formed in the lower surface of the working nut (13) in the circumferential direction, and the fifth groove (1301) is used for guiding rolling of the ball (18); a cylindrical sixth groove (1302) is formed in the axis position of the lower surface of the working nut (13), a cylindrical screw hole (1303) is formed in the sixth groove (1302) along the axis direction, and a threaded section (1403) of the support rod (14) is screwed in the screw hole (1303);

the strut (14) comprises a supporting section (1401), a blocking section (1402) and a threaded section (1403) which are coaxially connected; the supporting section (1401) is of a regular octagonal symmetrical structure, the clamping section (1402) is of a rectangular symmetrical structure, the thread section (1403) is of a cylindrical symmetrical structure, and the outer surface of the cylinder is provided with threads for screwing the working nut (13).

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