CN109848329B - Steel bar cold bending tester and testing method thereof - Google Patents
Steel bar cold bending tester and testing method thereof Download PDFInfo
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- CN109848329B CN109848329B CN201811585035.0A CN201811585035A CN109848329B CN 109848329 B CN109848329 B CN 109848329B CN 201811585035 A CN201811585035 A CN 201811585035A CN 109848329 B CN109848329 B CN 109848329B
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Abstract
The invention discloses a steel bar cold bending testing machine, which belongs to the field of steel bar cold bending testing equipment and comprises a base, wherein the top of the base is fixedly provided with a workbench, one side of the workbench is fixedly provided with a force application mechanism, and the workbench is provided with a positioning mechanism for fixing a steel bar and a limiting mechanism for accurately limiting the bending angle of the steel bar; the invention also discloses a test method of the steel bar cold bending tester, which comprises the following steps: a1. fixing the steel bars on a workbench; a2. the position of the stop block is adjusted according to the angle to be measured; a3. applying pressure to the reinforcing steel bars until the reinforcing steel bars are cold-bent; a4. taking down the cold-bent steel bars from the workbench; a5. the method has the advantages that the test result is evaluated, and the bending angle of the cold bending of the steel bar can be accurately controlled, so that the test result is more accurate.
Description
Technical Field
The invention relates to the field of steel bar cold bending test equipment, in particular to a steel bar cold bending test machine and a test method thereof.
Background
The cold bending test of the steel bar is the characteristic of stress-strain of the steel bar under the action of external force and is represented by a stress-strain curve in stretching. Has the indexes of yield point, tensile ultimate strength elongation, cold bending performance and the like. The evaluation method of the test result can be that the test piece is qualified if no crack, crack or fracture exists when the test piece is bent to a certain degree; the specified lengths and widths in the microcracks, cracks should be rated on this scale as long as one term reaches a certain specified range.
In the prior art, reference can be made to a Chinese patent with an authorization publication number of CN100557411, which discloses a double-station steel bar cold bending testing machine, comprising a force application device and a force bearing device; the force application device comprises a main oil cylinder piston rod and a bent core arranged at the top end of the main oil cylinder piston rod, and the force bearing device comprises an adjustable supporting device and an interference loading device; the adjustable supporting device comprises a screw rod and supporting rollers arranged at two ends of the screw rod, one end of the screw rod is also connected with a handle, and the handle is shaken to drive the screw rod to rotate and drive the two supporting rollers to advance and retreat synchronously; the interference loading device comprises a direction-finding loading oil cylinder, a 5-degree sample plate and an anti-wear pressure plate.
However, the above invention has the following disadvantages: when the curved core pushed down the reinforcing bar, the traditional mode all judged through staff's naked eye and pressed certain camber, can not accurate control reinforcing bar clod wash's bending angle to lead to the test result inaccurate.
Disclosure of Invention
The invention aims to provide a steel bar cold bending testing machine, wherein a positioning mechanism for fixing a steel bar and a limiting mechanism for accurately limiting the bending angle of the steel bar are arranged on a workbench, so that the bending angle of the steel bar cold bending can be accurately controlled, and the test result is more accurate.
The technical purpose of the invention is realized by the following technical scheme:
a cold bending testing machine for steel bars comprises a base, wherein a workbench is fixedly arranged at the top of the base, a force application mechanism is fixedly arranged on one side of the workbench, and a positioning mechanism for fixing the steel bars and a limiting mechanism for accurately limiting the bending angle of the steel bars are arranged on the workbench; the positioning mechanism comprises a first fixed block and a second fixed block which can relatively slide or oppositely slide on the top of the workbench, and one opposite sides of the first fixed block and the second fixed block are connected with positioning components for fixing two ends of the reinforcing steel bar; stop gear includes that the parallel sets firmly two stoppers at the workstation top and slides and connect the dog on two stoppers, has evenly seted up a plurality of spacing grooves on the stopper, and articulated on the dog have can the joint in the plug-in piece of spacing inslot.
Through adopting above-mentioned scheme, according to the length of test reinforcing bar, adjust the distance between fixed block one and the fixed block two, on being fixed in locating component with the both ends of reinforcing bar again, adjust the position of dog according to the angle of required reinforcing bar bending, application of force mechanism exerts pressure to the reinforcing bar, until the reinforcing bar bending to with the dog butt, can the crooked angle of accurate control reinforcing bar to it is more accurate to make the test result.
The invention is further configured to: the positioning assembly comprises a fixing ring hinged to the first fixing block, three sliding grooves are evenly formed in the fixing ring along the circumferential direction of the fixing ring, a positioning block used for fixing the reinforcing steel bar is connected in the sliding grooves in a sliding mode, and a fixing bolt used for fixing the positioning block and the positioning ring is connected to the positioning block in a threaded mode.
Through adopting above-mentioned scheme, when being fixed in the retaining ring with the reinforcing bar, make the tip of reinforcing bar pass solid fixed ring, the locating piece that slides again supports the lateral wall butt of locating piece and reinforcing bar, and rethread fixing bolt supports locating piece and solid fixed ring tightly, and then can be fixed reinforcing bar and retaining ring.
The invention is further configured to: the holding tank has been seted up to the both sides of dog, and the grafting piece articulates in the bottom of holding tank.
Through adopting above-mentioned scheme, the grafting piece is rotatable to the holding tank in, when needing to slide the dog to different positions, the grafting piece rotates to the holding tank in, makes the grafting piece not influence the sliding of dog.
The invention is further configured to: the force application mechanism comprises an oil cylinder fixedly arranged on one side of the workbench, and the end part of a piston rod of the oil cylinder is detachably connected with a bent core.
Through adopting above-mentioned scheme, the piston rod extension of hydro-cylinder, the curved core of the piston rod tip of hydro-cylinder can exert pressure to the reinforcing bar and make the reinforcing bar crooked, after the reinforcing bar crooked to with the dog butt, the piston rod stop motion of control hydro-cylinder, be connected for dismantling between the piston rod of curved core and hydro-cylinder, be convenient for change the curved core.
The invention is further configured to: the end part of a piston rod of the oil cylinder is provided with a through hole II, the bent core is provided with a through hole I, the through hole I and the through hole II are connected with bolts, and the bolts penetrate through the through hole I and the through hole II and are connected with nuts in a threaded mode.
Through adopting above-mentioned scheme, when changing the curved core, make the piston rod of hydro-cylinder peg graft in the round hole of curved core, in the round hole, make through-hole one and through-hole two overlap, fixed the curved core with the piston rod of hydro-cylinder through bolt and nut, fixed through bolt and nut, be convenient for change the curved core.
The invention is further configured to: the top of workstation is provided with the protection casing, has set firmly slide caliper rule on the protection casing, and the zero scale mark of slide caliper rule is located the positive center of protection casing side, sets firmly the pointer that extends to the slide caliper rule top on the fixed block one.
Through adopting above-mentioned scheme, according to the data that the pointer instructed, when the reading equals half of reinforcing bar length, can make the center of reinforcing bar and curved core on a horizontal plane, the protection casing can prevent that the reinforcing bar clod wash in-process departure workstation from, avoids bringing the injury to the staff.
The invention also aims to provide a test method of the steel bar cold bending tester, which comprises the following steps:
a1. fixing the steel bars on a workbench;
a2. the position of the stop block is adjusted according to the angle to be measured;
a3. applying pressure to the reinforcing steel bars until the reinforcing steel bars are cold-bent;
a4. taking down the cold-bent steel bars from the workbench;
a5. and evaluating the test result.
Through adopting above-mentioned scheme, earlier be fixed in the workstation with the reinforcing bar, the distance of dog is adjusted to the camber of the reinforcing bar of clod wash as required, exert pressure to the reinforcing bar to its crooked extremely with the dog butt, take off the reinforcing bar from the workstation again, carry out analysis and evaluation to the reinforcing bar at last, can accurate control reinforcing bar clod wash's bending angle to lead to the test result more accurate.
The invention is further configured to: in a1, driving the first fixing block and the second fixing block to slide, so that the distance between the first fixing block and the second fixing block is adapted to the length of the steel bar; and then the two ends of the steel bar are fixed on the fixing ring, the positioning block on the sliding fixing ring is abutted to the end part of the positioning block, and the positioning block is fixed with the fixing ring through the fixing bolt.
By adopting the scheme, the distance between the first fixing block and the second fixing block is adjusted to be adaptive to the length of the steel bar, the steel bar is fixed on the fixing rings of the first fixing block and the second fixing block, the middle part of the steel bar and the bent core can be positioned on the same horizontal plane, and the test result after cold bending is more accurate.
The invention is further configured to: in a2, the bending angle of the steel bar is bent according to the requirement, and the insertion blocks from the sliding stop block to the stop block are inserted into different limit grooves on the limit block.
Through adopting above-mentioned scheme, slide the dog to different positions, the grafting piece is pegged graft and can be fixed the dog in the spacing inslot, and the dog can carry on spacingly to the bending angle of bending, guarantees that the reinforcing bar can be crooked to required angle, and then can make the test result more accurate.
In conclusion, the invention has the following beneficial effects:
1. the positioning mechanism for fixing the steel bars and the limiting mechanism for accurately limiting the bending angle of the steel bars are arranged on the workbench, so that the bending angle of the cold bending of the steel bars can be accurately controlled, and the test result is more accurate;
2. the bent core is detachably connected with the piston rod of the oil cylinder, so that the thickness of a steel bar can be increased, and the bent cores with different lengths can be replaced, so that the test result is more accurate;
3. the protective cover is arranged at the top of the workbench, so that external objects can be prevented from falling onto the workbench, a piston rod of the oil cylinder is broken by a smashing method, and meanwhile, when the bent core applies pressure to the reinforcing steel bar, the reinforcing steel bar is popped out from a position between the first fixing block and the second fixing block.
Drawings
FIG. 1 is an isometric view of an embodiment;
FIG. 2 is a schematic structural view of the embodiment with the protective cover removed;
FIG. 3 is an exploded view of the curved core shown in connection with the piston rod of the cylinder;
FIG. 4 is a cross-sectional view of the table and positioning mechanism;
FIG. 5 is an exploded view of the positioning assembly shown in relief;
FIG. 6 is an enlarged view of portion A of FIG. 1;
FIG. 7 is a schematic structural view of a spacing assembly;
fig. 8 is a sectional view of the stopper mechanism.
In the figure, 1, a base; 2. a work table; 21. a T-shaped chute; 22. a protective cover; 221. a fixed mount; 2211. a caliper; 2212. an indicator needle; 222. a movable frame; 223. a protective net; 3. a force application mechanism; 31. an oil cylinder; 32. bending the core; 321. a circular hole; 322. a first through hole; 323. round corners; 33. a second through hole; 4. a positioning mechanism; 41. a first fixed block; 411. a first T-shaped sliding block; 412. a notch groove; 42. a second fixed block; 421. a T-shaped sliding block II; 43. aligning the filaments; 431. a hand-operated wheel; 44. a positioning assembly; 441. a fixing ring; 442. a sliding groove; 443. positioning blocks; 444. fixing the bolt; 5. a limiting mechanism; 51. a limiting block; 511. a limiting groove; 52. a stopper; 521. accommodating grooves; 53. and (6) plugging the blocks.
Detailed Description
A steel bar cold bending testing machine is shown in figure 1 and comprises a base 1, a workbench 2 and a force application mechanism 3 are fixedly arranged at the top of the base 1, and a positioning mechanism 4 used for fixing a steel bar is fixedly arranged on the workbench 2. The reinforcing steel bars are fixed on the positioning mechanism 4, and the force application mechanism 3 can apply pressure to the reinforcing steel bars to perform cold bending on the reinforcing steel bars.
Referring to fig. 2 and 3, the force applying mechanism 3 includes an oil cylinder 31 fixedly disposed on the top of the base 1, a piston rod of the oil cylinder 31 is disposed toward the positioning mechanism 4, and an end of the piston rod of the oil cylinder 31 is detachably connected with a bending core 32. The round hole 321 that supplies the piston rod to peg graft is seted up towards the one end of piston rod to curved core 32, and curved core 32 and piston rod are seted up two through-hole one 322 and the two 33 of through-hole that supply the bolt to pass respectively, peg graft curved core 32 on the piston rod, have the nut through threaded connection behind through-hole one 322 and the two 33 of through-hole in proper order, can be fixed curved core 32 with the piston rod of hydro-cylinder 31, and the fillet 323 has been seted up to the one end of the piston rod that the hydro-cylinder 31 was kept away from to curved core 32. The bending cores 32 with different diameters can be selected according to the thickness of the steel bars, so that the steel bars can be bent to a specified bending angle conveniently, and the measuring result is more accurate.
Referring to fig. 4 and 5, the positioning mechanism 4 comprises a first fixing block 41 and a second fixing block 42 which are connected to the top of the workbench 2 in a sliding manner, a first T-shaped sliding block 411 and a second T-shaped sliding block 421 are fixedly arranged at the bottoms of the first fixing block 41 and the second fixing block 42, a T-shaped sliding chute 21 for the first T-shaped sliding block 411 and the second T-shaped sliding block 421 to slide is formed in the top of the workbench 2, a pair wire 43 is connected to the first T-shaped sliding block 411 and the second T-shaped sliding block 421 in a threaded manner, one end of the pair wire 43 extends out of the workbench 2 and is fixedly provided with a hand wheel 431, and the distance between the first fixing block 41 and the second fixing block 42 can be adjusted by rotating the hand wheel 431 according to the length of the steel bar; the opposite sides of the first fixing block 41 and the second fixing block 42 are respectively provided with a positioning assembly 44 for fixing two ends of the steel bar, the positioning assembly 44 comprises a fixing ring 441 rotatably connected to the first fixing block 41, the fixing ring 441 is uniformly provided with three sliding grooves 442 facing the center of the fixing ring 441 along the circumferential direction, the sliding grooves 442 are connected with positioning blocks 443 capable of sliding into the fixing ring 441 in a sliding manner, the positioning blocks 443 are in threaded connection with fixing bolts 444 for fixing the positioning blocks 443 and the sliding grooves 442, the steel bar penetrates through the fixing ring 441, the end parts of the positioning blocks 443, which are located at the positioning blocks 443, are tightly abutted against the steel bar, and finally the fixing bolts 444 are screwed, so that the steel bar and the fixing ring 441 can be fixed; the positions of the first fixing block 41 and the second fixing block 42 close to the fixing ring 441 are provided with notch grooves 412 for inserting the end portions of the reinforcing steel bars.
Referring to fig. 1 and 6, a protective cover 22 is fixedly arranged at the top of the workbench 2, the protective cover 22 includes a fixed frame 221 fixedly connected to the workbench 2 and a movable frame 222 rotatably connected to one side of the fixed frame 221, the fixed frame 221 is located above the first fixed block 41 and the second fixed block 42, the movable frame 222 is located above a piston rod of the oil cylinder 31, a protective net 223 is fixedly arranged on the movable frame 222, the protective net 223 and the movable frame 222 can prevent an object falling from the outside from smashing the piston rod of the oil cylinder 31, and the fixed frame 221 can prevent a steel bar from popping outwards in a bending process to hurt workers and the like. The top of one side of the fixed frame 221, which is far away from the movable frame 222, is fixedly provided with a caliper 2211, the zero scale of the caliper 2211 is located in the center of the side of the fixed rod, the top of the second fixed block 42 is fixedly provided with an indicator 2212 which extends to the upper side of the caliper 2211, a steel bar which is measured in advance is fixed on the fixed ring 441, and a half of the length of the steel bar can be read from the indicator 2212, namely the middle of the steel bar and the bent core 32 are proved to be on the same horizontal plane, so that the measurement result is more accurate.
Referring to fig. 7 and 8, a limiting mechanism 5 for accurately limiting the bending angle of the reinforcing steel bars is arranged at the top of the working table 2. Stop gear 5 is including setting firmly two stopper 51 that are parallel to each other between fixed block one 41 and fixed block two 42, stopper 51 and fixed block one 41 parallel arrangement, a plurality of spacing grooves 511 have been seted up to the symmetry on two stopper 51, it is connected with a dog 52 to slide between two stopper 51, the bilateral symmetry of dog 52 articulates there is the grafting piece 53 that can peg graft in spacing groove 511 and be used for on the fixed dog 52, when grafting piece 53 on dog 52 pegs graft in different spacing grooves 511, curved core 32 bends reinforcing bar to reinforcing bar butt on dog 52, the bending angle that can the accurate control reinforcing bar, and then can make measured data more accurate. Holding tank 521 has been seted up to the symmetry on dog 52, and grafting piece 53 articulates in the bottom of holding tank 521, and during the dog 52 that slides, in rotating the holding tank 521 of dog 52 with grafting piece 53, make the slip that grafting piece 53 does not influence dog 52.
A test method of a steel bar cold bending tester comprises the following steps:
the method comprises the following steps: fix the reinforcing bar on workstation 2:
1. measuring the length of the steel bar, adjusting the distance between the first fixing block 41 and the second fixing block 42 according to the length of the steel bar, and rotating the hand-operated wheel 431 to enable the distance between the first fixing block 41 and the second fixing block 42 to be suitable for the length of the steel bar;
2. fixing the steel bar on the fixing ring 441, so that two ends of the steel bar extend into the fixing ring 441, sliding the positioning block 443 until the end of the positioning block 443 abuts against the outer side wall of the steel bar, and then screwing the fixing bolt 444 until the end abuts against the fixing ring 441, so that the steel bar can be fixed on the fixing ring 441;
3. reading the reading on the caliper 2211, and reading through the pointer 2212 to see whether the reading is equal to half of the length of the steel bar or not, so as to ensure that the middle part of the steel bar and the bent core 32 are on the same horizontal plane;
4. according to the thickness of the required steel bar, the bending core 32 with proper diameter is selected, and the bending core 32 is installed on the piston rod of the oil cylinder 31.
Step two: the position of the stop 52 is adjusted according to the data to be measured:
the stopper 52 is slid between the two stoppers 51, and the sliding stopper 52 allows the insertion block 53 of the stopper 52 to be inserted into the stopper slot 511 according to the different bending angles of the steel bars to be measured.
Step three: and (3) pressing the reinforcing steel bars until the reinforcing steel bars are cold-bent:
1. the piston rod of the oil cylinder 31 is controlled to extend, so that the bent core 32 applies pressure to the steel bar in the direction of the stop block 52, and the steel bar can drive the fixing ring 441 to rotate when being bent;
2. when the bending core 32 pushes the steel bar to bend until the steel bar is abutted to the stopper 52, the piston rod of the oil cylinder 31 stops moving.
Step four: taking down the steel bars after cold bending from the workbench 2:
1. the piston rod of the oil cylinder 31 is controlled to retract, and the bent core 32 is driven to move towards the direction far away from the steel bar and move to the position where the bent core 32 is far away from the steel bar;
2. the reinforcing steel bar is detached from the workbench 2, the fixing bolt 444 is firstly unscrewed, and then the positioning block 443 is slid until the positioning block is separated from the reinforcing steel bar, so that the reinforcing steel bar can be separated from the fixing ring 441.
Step five: and evaluating the test result:
and checking whether the steel bar has cracks, comparing and evaluating the cracks on the steel bar with the microcracks, cracks and cracks, and calculating and comparing the length and the width of the steel bar to judge whether the steel bar is the microcracks, the cracks or the cracks.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. The utility model provides a reinforcing bar clod wash testing machine, includes base (1), and workstation (2) have set firmly at the top of base (1), and one side of workstation (2) has set firmly application of force mechanism (3), its characterized in that:
the workbench (2) is provided with a positioning mechanism (4) for fixing the steel bar and a limiting mechanism (5) for accurately limiting the bending angle of the steel bar;
the positioning mechanism (4) comprises a first fixed block (41) and a second fixed block (42) which can relatively slide or oppositely slide on the top of the workbench (2), and one opposite side of the first fixed block (41) and the second fixed block (42) is connected with a positioning assembly (44) for fixing two ends of a reinforcing steel bar;
the limiting mechanism (5) comprises two limiting blocks (51) fixedly arranged at the top of the workbench (2) in parallel and a stop block (52) connected to the two limiting blocks (51) in a sliding manner, a plurality of limiting grooves (511) are uniformly formed in the limiting blocks (51), and an inserting block (53) capable of being clamped in the limiting grooves (511) is hinged to the stop block (52); the positioning assembly (44) comprises a fixing ring (441) hinged to the first fixing block (41), three sliding grooves (442) are uniformly formed in the fixing ring (441) along the circumferential direction of the fixing ring, a positioning block (443) used for fixing the reinforcing steel bar is connected to the sliding grooves (442) in a sliding mode, and a fixing bolt (444) used for fixing the positioning block (443) and the fixing ring (441) is connected to the positioning block (443) in a threaded mode.
2. The cold bending tester for steel bars according to claim 1, characterized in that: holding grooves (521) are formed in two sides of the stop block (52), and the insertion block (53) is hinged to the bottoms of the holding grooves (521).
3. The cold bending tester for steel bars according to claim 1, characterized in that: the force application mechanism (3) comprises an oil cylinder (31) fixedly arranged on one side of the workbench (2), and the end part of a piston rod of the oil cylinder (31) is detachably connected with a bent core (32).
4. The cold bending tester for steel bars according to claim 3, characterized in that: round hole (321) that can the cover locate the piston rod tip of hydro-cylinder (31) are seted up to the one end of curved core (32), and through-hole two (33) have been seted up to the tip of the piston rod of hydro-cylinder (31), have seted up through-hole one (322) on curved core (32), are connected with the bolt on through-hole one (322) and through-hole two (33), and threaded connection has the nut after the bolt passes through-hole one (322) and through-hole two (33).
5. The cold bending tester for steel bars according to claim 1, characterized in that: the top of workstation (2) is provided with protection casing (22), has set firmly slide caliper rule (2211) on protection casing (22), and the zero scale mark of slide caliper rule (2211) is located the positive center of protection casing (22) side, sets firmly pointer (2212) that extends to slide caliper rule (2211) top on fixed block (41).
6. A test method of a steel bar cold bending tester is characterized in that: the steel bar cold bending tester of any one of claims 1-5 is used for testing, and comprises the following steps:
a1. fixing the steel bars on the workbench (2): driving the first fixing block (41) and the second fixing block (42) to slide, so that the distance between the first fixing block (41) and the second fixing block (42) is adapted to the length of the steel bar; fixing two ends of the steel bar on the fixing ring (441), sliding a positioning block (443) on the fixing ring (441) to the end of the positioning block (443) to abut against the steel bar, and fixing the positioning block (443) and the fixing ring (441) through a fixing bolt (444);
a2. the position of the stop (52) is adjusted according to the angle to be measured: according to the bending angle of the steel bar to be bent, the stop block (52) is slid to the insertion block (53) on the stop block (52) to be inserted into different limit grooves (511) on the limit block (51);
a3. applying pressure to the reinforcing steel bars until the reinforcing steel bars are cold-bent;
a4. taking down the cold-bent steel bars from the workbench (2);
a5. and evaluating the test result.
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| CN110508714B (en) * | 2019-08-09 | 2020-09-11 | 新昌县利拓科技有限公司 | Industrial reinforcing steel bar bending device |
| CN110695246A (en) * | 2019-10-18 | 2020-01-17 | 石家庄建工集团有限公司 | Hydraulic construction steel bar bending equipment |
| US11846613B2 (en) | 2020-12-31 | 2023-12-19 | Bayou Holdco, Inc. | Strain testing rig and method of evaluating strain characteristics of specimen |
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| JP2015123470A (en) * | 2013-12-26 | 2015-07-06 | 新日鐵住金株式会社 | Bending processing device and bending processing method |
| CN107442615A (en) * | 2017-07-17 | 2017-12-08 | 河南平高电气股份有限公司 | A kind of adjustable bend pipe mould |
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| JPS5933850B2 (en) * | 1982-03-30 | 1984-08-18 | 株式会社島津製作所 | Bending test method |
| DE3247200C2 (en) * | 1982-12-21 | 1987-05-07 | Emil Wolff, Maschinenfabrik Und Eisengiesserei Gmbh, 4300 Essen | Method and bending press for bending the pipe section of a straight pipe into a finished pipe bend |
| CN107377703A (en) * | 2017-07-13 | 2017-11-24 | 安徽盛美金属科技有限公司 | A kind of pneumatic bending machine |
| CN108941284A (en) * | 2018-07-24 | 2018-12-07 | 南京中高知识产权股份有限公司 | A kind of SMART METALS pipe fitting bending machine |
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| JP2015123470A (en) * | 2013-12-26 | 2015-07-06 | 新日鐵住金株式会社 | Bending processing device and bending processing method |
| CN107442615A (en) * | 2017-07-17 | 2017-12-08 | 河南平高电气股份有限公司 | A kind of adjustable bend pipe mould |
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