A clamping device for bending a steel pipe

Abstract

The application discloses a clamping device for steel pipe bending, and belongs to the technical field of steel pipe bending equipment. The clamping device comprises a base, a rotating disc arranged on the base, an arc-shaped groove arranged on the side of the rotating disc, a rotating clamping assembly arranged on the rotating disc and used for fixing the bending position of the steel pipe in the arc-shaped groove, an end fixing assembly arranged on the base and corresponding to one side of the rotating disc and used for fixing the end of the steel pipe, and a motor fixedly arranged on the base and used for driving the rotating disc to rotate so that the steel pipe at the arc-shaped groove is bent. The clamping device further comprises a blowing structure arranged on the rotating disc and the rotating clamping assembly and used for blowing away impurities before fixing the bending position of the steel pipe. The clamping device for steel pipe bending provides gas through the air cylinder assembly and blows away impurities through two groups of blowing holes, so that a clean contact surface is provided before the steel pipe is clamped in the arc-shaped groove by the rotating clamping assembly, and impurities are prevented from affecting clamping tightness and causing damage to the surface of the steel pipe.

Description

Technical Field

[0001] This application relates to the technical field of steel pipe bending equipment, specifically a clamping device for bending steel pipes. Background Technology

[0002] As a basic material widely used in many fields such as construction, machinery manufacturing, and pipeline engineering, steel pipes have strict industry standards and usage requirements for dimensional accuracy, angular deviation, and surface integrity after bending.

[0003] Chinese utility model patent CN219309903U discloses a clamp for bending steel pipes. It counteracts some of the force generated during bending by limiting the top of the clamp, and the movable clamping part is driven by a clamping drive assembly to ensure stable and precise clamping each time, thus achieving effective clamping and bending of the steel pipe. However, it directly fixes the steel pipe at the bending position using the clamp before bending. During the initial cutting, handling, or storage process, metal shavings, dust, and other impurities easily adhere to the outer wall of the steel pipe. If these impurities remain at the bending point and on the contact surface of the clamping components, they can cause gaps between the clamping assembly and the steel pipe, affecting the tightness of the clamping and making the steel pipe prone to slippage during bending, thus reducing bending accuracy. Furthermore, hard particles can easily become embedded in the surface of the steel pipe under the clamping force, causing surface scratches, indentations, and other damage, thereby affecting the quality of the bent steel pipe.

[0004] Therefore, this application provides a clamping device for bending steel pipes to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a clamping device for bending steel pipes, aiming to solve the problems mentioned in the background art. Existing clamps directly fix the steel pipe and then perform bending without treating the metal shavings, dust and other impurities attached to the outer wall of the steel pipe. As a result, these impurities can easily cause gaps between the clamping components and the steel pipe, affecting the clamping tightness and bending accuracy. They can also easily cause scratches, indentations and other damage to the surface of the steel pipe, affecting the bending quality.

[0006] To achieve the above objectives, this application provides the following technical solution: a clamping device for bending steel pipes, comprising a base, a turntable disposed on the base, an arc-shaped groove disposed on the side of the turntable, a rotary clamping assembly disposed on the turntable for fixing the bent portion of the steel pipe in the arc-shaped groove, an end fixing assembly disposed on the base corresponding to one side of the turntable for fixing the end of the steel pipe, and a motor fixedly disposed on the base for driving the turntable to rotate and bend the steel pipe in the arc-shaped groove. The clamping device further comprises an air blowing structure disposed on the turntable and the rotary clamping assembly for blowing impurities before fixing the bent portion of the steel pipe.

[0007] The air-blowing structure includes two sets of air-blowing holes fixedly disposed on the turntable at the position corresponding to the arc-shaped groove and on the rotary clamping assembly, respectively, and an air cylinder assembly disposed on the rotary clamping assembly for blowing gas from the air-blowing holes onto the surface of the steel pipe. The air cylinder assembly provides gas, and the two sets of air-blowing holes blow impurities onto the surface of the steel pipe at the bending point, so as to provide a cleaner contact surface before the steel pipe is clamped by the rotary clamping assembly at the position of the arc-shaped groove for strong bending. This prevents metal shavings, dust, etc. from adhering to the outer wall of the steel pipe during cutting, handling, and storage, which would affect the tightness of the clamping. At the same time, it can also reduce the embedding of hard particles into the surface of the steel pipe, which would cause damage to the surface of the steel pipe and affect the quality of bending.

[0008] Preferably, in order to achieve rotary clamping of the workpiece placed in the arc-shaped groove, the rotary clamping assembly includes a concave frame fixedly mounted on the turntable corresponding to the outer side of the arc-shaped groove, a semi-arc clamping block disposed on the side of the concave frame near the arc-shaped groove, guide grooves respectively opened on the concave frame at the top and bottom positions of the semi-arc clamping block, a slider fixedly mounted on the semi-arc clamping block and slidably connected in the guide groove, and a cylinder fixedly mounted on the side of the concave frame away from the arc-shaped groove for driving the semi-arc clamping block to move closer to or away from the arc-shaped groove. An air blowing hole located on the rotary clamping assembly is fixedly disposed on the side of the semi-arc clamping block near the arc-shaped groove. By extending and retracting the cylinder, the semi-arc clamping block can be moved closer to or away from the arc-shaped groove, thereby achieving clamping or loosening of the steel pipe, and the air blowing hole provided on the semi-arc clamping block can perform air blowing operation on the workpiece.

[0009] Preferably, in order to fix the end of the steel pipe, the end fixing assembly includes a fixed seat fixedly mounted on the base and located on one side of the concave frame, a fixed clamping block fixedly mounted on the fixed seat, a mounting frame fixedly mounted on the fixed seat at a position corresponding to the fixed clamping block, a movable clamping block disposed between the mounting frame and the fixed clamping block, a second cylinder fixedly mounted on the mounting frame for driving the movable clamping block to rise and fall, and guide rods symmetrically fixedly mounted on the movable clamping block and slidably connected to the mounting frame; by extending and retracting the second cylinder to drive the movable clamping block to fall or rise, it can cooperate with the fixed clamping block to clamp or release the end of the workpiece, thereby ensuring the stability of the steel pipe during processing.

[0010] Preferably, in order to prevent the guide rod from detaching from the mounting bracket and ensure the normal operation of the end fixing assembly, a limiting block is fixedly installed on the top of the guide rod to prevent the guide rod from detaching from the mounting bracket; the size of the limiting block is larger than the diameter of the hole on the mounting bracket for the guide rod to slide. When the guide rod descends to a certain position, the limiting block will contact the upper surface of the mounting bracket, preventing the guide rod from continuing to descend, thereby preventing it from detaching from the mounting bracket. At the same time, the limiting block will not obstruct the up and down movement of the guide rod within its normal stroke range.

[0011] Preferably, in order to provide gas to the air inlet and realize the air blowing function, the air cylinder assembly includes air storage cylinders respectively fixedly installed on the concave frame at positions corresponding to one side of the two guide grooves, pistons respectively slidably connected in the two air storage cylinders, push rods respectively passing through one end of the two air storage cylinders and fixedly connected to the pistons, air outlet pipes respectively fixedly installed on the two air storage cylinders away from the ends of the push rods, delivery pipes respectively fixedly connected to the ends of the two air outlet pipes away from the ends of the air storage cylinders, and delivery pipes respectively fixedly installed on the two... An air inlet pipe is located on one side of the air storage cylinder. The ends of the two push rods away from the corresponding pistons are respectively fixedly connected to the two sliders. The ends of the two delivery pipes away from the corresponding air outlet pipes are respectively connected to the air blowing holes located on the arc-shaped groove and the semi-arc-shaped clamping block. By moving the sliders, the push rods and pistons can slide inside the air storage cylinder, which can change the air pressure inside the air storage cylinder. The air enters through the air inlet pipe or is discharged from the air outlet pipe, and is delivered to the air blowing hole through the delivery pipe for blowing. Therefore, no additional power source is needed to provide blowing gas, and the structure is simple.

[0012] Preferably, to avoid interference with the rotation of the arc-shaped groove and the semi-arc clamp, both of the conveying pipes are flexible hoses; the flexible hoses have good flexibility and bendability, and when the arc-shaped groove and the semi-arc clamp rotate, the flexible hoses can bend and deform accordingly, unlike rigid pipes which cannot bend and thus hinder their rotation, thereby ensuring that the gas can be smoothly conveyed through the conveying pipes to the blowing hole.

[0013] Preferably, in order to reduce the adhesion of impurities to the concave frame, the concave frame has a hollow structure at the position below the semi-circular clamping block; the hollow structure at the position below the semi-circular clamping block increases the space and ventilation under the concave frame, making it less likely for impurities to accumulate in the hollow area under the action of gravity. At the same time, the air circulation also makes it easier for the already attached impurities to be blown away or fall off naturally, reducing the amount of impurities attached to the concave frame, thereby keeping the concave frame clean.

[0014] The clamping device for bending steel pipes provides gas through an air cylinder assembly and uses two sets of air holes to blow impurities onto the surface of the steel pipe at the bending point. This provides a cleaner contact surface before the steel pipe is clamped in the arc-shaped groove by the rotating clamping assembly for strong bending. This prevents metal shavings, dust, etc. from adhering to the outer wall of the steel pipe during cutting, handling, and storage, which would affect the tightness of the clamping. At the same time, it can also reduce the embedding of hard particles into the surface of the steel pipe, which would cause damage to the surface of the steel pipe and affect the quality of bending.

[0015] The clamping device for bending the steel pipe moves a slider to drive the push rod and piston to slide inside the air storage cylinder, which can change the air pressure inside the air storage cylinder. The Shudie gas enters through the air inlet pipe or is discharged from the air outlet pipe, and is transported to the blowing hole through the delivery pipe for blowing. Therefore, no additional power source is needed to provide blowing gas, and the structure is simple. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a clamping device for bending steel pipes.

[0017] Figure 2 This is a schematic diagram of the end fixing assembly in a clamping device for bending steel pipes.

[0018] Figure 3 This is a schematic diagram of the rotating clamping assembly in a clamping device for bending steel pipes.

[0019] Figure 4 This is a cross-sectional schematic diagram of the air cylinder assembly in a clamping device for bending steel pipes.

[0020] In the picture:

[0021] 1. Base;

[0022] 2. Turntable;

[0023] 3. Arc-shaped groove;

[0024] 4. Rotary clamping assembly; 41. Concave frame; 411. Hollow structure; 42. Semi-arc clamping block; 43. Guide groove; 44. Slider; 45. Cylinder 1;

[0025] 5. End fixing assembly; 51. Fixing base; 52. Fixing clamp; 53. Mounting bracket; 54. Movable clamp; 55. Cylinder II; 56. Guide rod; 561. Limit stop;

[0026] 6. Electric motor;

[0027] 7. Air blowing structure; 71. Air blowing hole; 72. Air cylinder assembly; 721. Air storage cylinder; 722. Piston; 723. Push rod; 724. Air outlet pipe; 725. Delivery pipe; 726. Air inlet pipe. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This embodiment provides a clamping device for bending steel pipes, such as... Figures 1-4 As shown, the clamping device includes a base 1, a turntable 2 mounted on the base 1, an arc-shaped groove 3 on the side of the turntable 2, a rotary clamping assembly 4 mounted on the turntable 2 for fixing the bent part of the steel pipe in the arc-shaped groove 3, an end fixing assembly 5 mounted on the base 1 corresponding to one side of the turntable 2 for fixing the end of the steel pipe, and a motor 6 fixed on the base 1 for driving the turntable 2 to rotate and bend the steel pipe at the arc-shaped groove 3. The clamping device also includes an air blowing structure 7 mounted on the turntable 2 and the rotary clamping assembly 4 for blowing air before fixing the bent part of the steel pipe. The air blowing structure 7 includes two sets of air blowing holes 71 fixed on the turntable 2 at the position corresponding to the arc-shaped groove 3 and on the rotary clamping assembly 4, respectively, and an air cylinder assembly 72 mounted on the rotary clamping assembly 4 for blowing air from the air blowing holes 71 onto the surface of the steel pipe.

[0030] In use, place the steel pipe to be bent in the designated position, aligning the bend with the arc-shaped groove 3 on the side of the turntable 2, and align the end of the steel pipe with the end fixing component 5. Then, operate the rotating clamping component 4 to fix the bend of the steel pipe in the arc-shaped groove 3. At the same time, operate the end fixing component 5 to fix the end of the steel pipe, ensuring that the steel pipe will not shift during the bending process. However, since the air cylinder component 72 is connected to the rotating clamping component 4, while the rotating clamping component 4 is operating to fix the bend of the steel pipe in the arc-shaped groove 3, the air cylinder component 72 on the air blowing structure 7 can simultaneously supply gas. The gas passes through the arc-shaped grooves 3 on the turntable 2. Two sets of air blowing holes 71 on the position and the rotary clamping assembly 4 blow air onto the surface of the steel pipe bending point to remove metal shavings, dust and other impurities on the steel pipe surface. This ensures that the contact surface of the steel pipe is clean before the rotary clamping assembly 4 fixes the steel pipe bending point in the arc groove 3. After the rotary clamping assembly 4 fixes the steel pipe bending point in the arc groove 3, the air blowing structure 7 stops. At this time, the motor 6 is started to drive the turntable 2 to rotate. As the turntable 2 rotates, the arc groove 3 causes the fixed steel pipe bending point to bend, thereby completing the bending operation of the steel pipe. After the bending is completed, the rotary clamping assembly 4 and the end fixing assembly 5 are released, and the bent steel pipe is removed, completing one bending operation.

[0031] Specifically, the rotary clamping assembly 4 includes a concave frame 41 fixedly mounted on the turntable 2 corresponding to the outer side of the arc-shaped groove 3, a semi-arc clamping block 42 mounted on the side of the concave frame 41 near the arc-shaped groove 3, guide grooves 43 respectively opened on the concave frame 41 at the top and bottom positions of the semi-arc clamping block 42, a slider 44 fixedly mounted on the semi-arc clamping block 42 and slidably connected in the guide groove 43, and a cylinder 45 fixedly mounted on the side of the concave frame 41 away from the arc-shaped groove 3 for driving the semi-arc clamping block 42 to move closer to or away from the arc-shaped groove 3. An air blowing hole 71 located on the rotary clamping assembly 4 is fixedly mounted on the side of the semi-arc clamping block 42 near the arc-shaped groove 3.

[0032] When preparing to fix the bend in the steel pipe, cylinder 45 is activated. The extension and retraction of cylinder 45 generates driving force, which acts on the semi-circular clamp 42, causing it to move towards the arc-shaped groove 3. Since a slider 44 is fixedly installed on the semi-circular clamp 42, and guide grooves 43 are respectively opened on the concave frame 41 at the top and bottom positions of the semi-circular clamp 42, the slider 44 is slidably connected in the guide grooves 43. This allows the semi-circular clamp 42 to move stably and linearly along the guide grooves 43 during movement, ensuring the accuracy of movement. As cylinder 45 continues to extend and retract, the semi-circular clamp 42 eventually cooperates with the arc-shaped groove 3, tightly clamping the bend in the steel pipe, thus achieving a firm fixation of the bend in the steel pipe. This allows the turntable 2 to rotate and drive the steel pipe to perform bending operations. After the steel pipe is bent, cylinder 45 extends and retracts in the opposite direction, pulling the semi-circular clamp 42 away from the arc-shaped groove 3, thereby releasing the fixation of the bend in the steel pipe.

[0033] Furthermore, the end fixing assembly 5 includes a fixing seat 51 fixedly mounted on the base 1 and located on one side of the concave frame 41, a fixing clamp 52 fixedly mounted on the fixing seat 51, a mounting frame 53 fixedly mounted on the fixing seat 51 at a position above the fixing clamp 52, a movable clamp 54 disposed between the mounting frame 53 and the fixing clamp 52, a second cylinder 55 fixedly mounted on the mounting frame 53 for driving the movable clamp 54 to rise and fall, and guide rods 56 symmetrically fixedly disposed on the movable clamp 54 and slidably connected to the mounting frame 53.

[0034] When the steel pipe to be bent is fixed in the arc-shaped groove 3 on the side of the turntable 2 by rotating the clamping assembly 4, the end of the steel pipe is simultaneously placed in the fixed clamping block 52, and the second cylinder 55 is activated. The extension and retraction force of the second cylinder 55 will push the movable clamping block 54 down. Since the movable clamping block 54 is symmetrically fixed with guide rods 56, and the guide rods 56 are slidably connected to the mounting bracket 53, the movable clamping block 54 can descend stably along the direction of the guide rods 56 under the drive of the second cylinder 55, ensuring the straightness and accuracy of the descent. As the movable clamping block 54 descends, the movable clamping block 54 gradually approaches the fixed clamping block 52, and finally clamps the end of the steel pipe tightly, achieving a firm fixation of the end of the steel pipe. After the steel pipe is bent, the second cylinder 55 extends and retracts in the opposite direction, pulling the movable clamping block 54 up, releasing the fixation of the end of the steel pipe. At this time, the bent steel pipe can be easily removed.

[0035] In order to prevent the guide rod 56 from detaching from the mounting bracket 53 and to ensure the normal operation of the end fixing assembly 5, a limiting block 561 is fixedly installed on the top of the guide rod 56 to prevent the guide rod 56 from detaching from the mounting bracket 53. The size of the limiting block 561 is larger than the diameter of the hole on the mounting bracket 53 for the guide rod 56 to slide. When the guide rod 56 descends to a certain position, the limiting block 561 will contact the upper surface of the mounting bracket 53 to prevent the guide rod 56 from continuing to descend, thereby preventing it from detaching from the mounting bracket 53. At the same time, the limiting block 561 will not obstruct the up and down movement of the guide rod 56 within the normal stroke range.

[0036] Furthermore, the air cylinder assembly 72 includes air cylinders 721 fixedly installed on the concave frame 41 at positions corresponding to one side of the two guide grooves 43, pistons 722 slidably connected to the two air cylinders 721, push rods 723 passing through one end of the two air cylinders 721 and fixedly connected to the pistons 722, air outlet pipes 724 fixedly installed at the ends of the two air cylinders 721 away from the push rods 723, delivery pipes 725 fixedly connected to the ends of the two air outlet pipes 724 away from the air cylinders 721, and air inlet pipes 726 fixedly installed on one side of the two air cylinders 721. The ends of the two push rods 723 away from the corresponding pistons 722 are fixedly connected to the two sliders 44, and the ends of the two delivery pipes 725 away from the corresponding air outlet pipes 724 are connected to the air blowing holes 71 located on the arc-shaped groove 3 and the air blowing holes 71 on the semi-arc clamp 42, respectively.

[0037] When the semi-circular clamping block 42 of the rotary clamping assembly 4 moves under the drive of the cylinder 45, and simultaneously drives the two sliders 44 to move, the two sliders 44 will simultaneously push the push rod 723 connected to them, causing the pistons 722, which are respectively slidably connected in the two air storage cylinders 721, to slide towards the end of the air outlet pipe 724 in the air storage cylinder 721. As the pistons 722 continue to move, they compress the gas in the air storage cylinder 721, causing the gas to flow out from the air outlet pipes 724, which are respectively fixedly set at the ends of the two air storage cylinders 721 away from the corresponding push rods 723. Then, through the conveying pipes 725, which are respectively fixedly connected to the ends of the two air outlet pipes 724 away from the corresponding air storage cylinders 721, the gas is delivered to the blowing holes 71 located on the arc-shaped groove 3 and the blowing holes on the semi-circular clamping block 42, which are connected to the ends of the two conveying pipes 725 away from the corresponding air outlet pipes 724. Air is blown out through the air vent 71 and directed towards the surface of the steel pipe to be bent, thus removing metal shavings, dust, and other impurities adhering to the steel pipe surface. However, when the semi-circular clamp 42 fixes the steel pipe bending point in the arc-shaped groove 3, the air cylinder assembly 72 pauses its operation. After the bending is completed and the steel pipe is removed, it can wait for the next operation cycle. Conversely, when the steel pipe is bent, the cylinder 45 extends and retracts in the opposite direction, pulling the semi-circular clamp 42 away from the arc-shaped groove 3. The two sliders 44 will also simultaneously pull the piston 722 on the corresponding connecting push rod 723, which slides away from the air outlet pipe 724 in the air storage cylinder 721. As the piston 722 continues to move, a negative pressure is formed inside the air storage cylinder 721, and the gas is drawn in through the air inlet pipe 726 and stored in the air storage cylinder 721, preparing for the next cleaning of impurities on the steel pipe surface.

[0038] It should be noted that both the outlet pipe 724 and the inlet pipe 726 are equipped with one-way valves, and the inlet of the inlet pipe 726 is equipped with a filter screen. When the piston 722 moves in the air storage cylinder 721 to compress gas, the one-way valve in the outlet pipe 724 only allows gas to flow out from the air storage cylinder 721 through the outlet pipe 724 to prevent gas backflow. When the piston 722 moves in the opposite direction to draw in gas, the one-way valve in the inlet pipe 726 allows outside gas to enter the air storage cylinder 721, preventing gas leakage in the air storage cylinder 721. At the same time, the filter screen at the inlet of the inlet pipe 726 can filter dust, impurities, etc. in the drawn-in gas to ensure that the gas entering the air storage cylinder 721 is clean.

[0039] In addition, to avoid interference with the rotation of the arc-shaped groove 3 and the semi-arc clamp 42, both delivery pipes 725 are flexible hoses. The flexible hoses have good flexibility and bendability. When the arc-shaped groove 3 and the semi-arc clamp 42 rotate, the flexible hoses can bend and deform accordingly. Unlike rigid pipes, they will not be unable to bend and thus hinder their rotation. This ensures that the gas can be smoothly delivered to the blowing hole 71 through the delivery pipes 725.

[0040] It is worth noting that, in order to reduce the adhesion of impurities to the concave frame 41, the concave frame 41 has a hollow structure 411 at the position below the semi-circular clamping block 42. The hollow structure 411 at the position below the semi-circular clamping block 42 increases the space and ventilation under the concave frame 41, making it less likely for impurities to accumulate in the hollow area under the action of gravity. At the same time, the air circulation also makes it easier for the already attached impurities to be blown away or fall off naturally, reducing the amount of impurities attached to the concave frame 41, thereby keeping the concave frame 41 clean.

[0041] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A clamping device for bending steel pipes, comprising a base (1), a turntable (2) disposed on the base (1), an arc-shaped groove (3) disposed on the side of the turntable (2), a rotary clamping assembly (4) disposed on the turntable (2) for fixing the bent part of the steel pipe in the arc-shaped groove (3), an end fixing assembly (5) disposed on the base (1) corresponding to one side of the turntable (2) for fixing the end of the steel pipe, and a motor (6) fixedly disposed on the base (1) for driving the turntable (2) to rotate and bend the steel pipe at the arc-shaped groove (3), characterized in that: The clamping device also includes an air blowing structure (7) provided on the turntable (2) and the rotary clamping assembly (4) for blowing away impurities before fixing the bent part of the steel pipe. The air blowing structure (7) includes two sets of air blowing holes (71) respectively fixed on the turntable (2) at the position corresponding to the arc groove (3) and on the rotary clamping assembly (4), and an air cylinder assembly (72) set on the rotary clamping assembly (4) for blowing gas from the air blowing holes (71) to the surface of the steel pipe.

2. The clamping device for bending steel pipes according to claim 1, characterized in that: The rotary clamping assembly (4) includes a concave frame (41) fixedly disposed on the turntable (2) corresponding to the outer side of the arc groove (3), a semi-arc clamping block (42) disposed on the side of the concave frame (41) near the arc groove (3), guide grooves (43) respectively opened on the concave frame (41) corresponding to the top and bottom positions of the semi-arc clamping block (42), a slider (44) fixedly installed on the semi-arc clamping block (42) and slidably connected in the guide groove (43), and a cylinder (45) fixedly installed on the side of the concave frame (41) away from the arc groove (3) for driving the semi-arc clamping block (42) to move closer to or away from the arc groove (3). An air blowing hole (71) located on the rotary clamping assembly (4) is fixedly disposed on the side of the semi-arc clamping block (42) near the arc groove (3).

3. The clamping device for bending steel pipes according to claim 2, characterized in that: The end fixing assembly (5) includes a fixed seat (51) fixedly mounted on the base (1) and located on one side of the concave frame (41), a fixed clamping block (52) fixedly mounted on the fixed seat (51), a mounting frame (53) fixedly mounted on the fixed seat (51) at a position corresponding to the fixed clamping block (52), a movable clamping block (54) disposed between the mounting frame (53) and the fixed clamping block (52), a second cylinder (55) fixedly mounted on the mounting frame (53) for driving the movable clamping block (54) to rise and fall, and a guide rod (56) symmetrically fixedly disposed on the movable clamping block (54) and slidably connected to the mounting frame (53).

4. The clamping device for bending steel pipes according to claim 3, characterized in that: The top of the guide rod (56) is fixedly equipped with a limiting block (561) to prevent the guide rod (56) from detaching from the mounting bracket (53).

5. The clamping device for bending steel pipes according to claim 2, characterized in that: The air cylinder assembly (72) includes air cylinders (721) fixedly installed on the concave frame (41) at positions corresponding to one side of the two guide grooves (43), pistons (722) slidably connected to the two air cylinders (721), push rods (723) passing through one end of the two air cylinders (721) and fixedly connected to the pistons (722), air outlet pipes (724) fixedly installed on the two air cylinders (721) away from the ends of the push rods (723), and air outlet pipes (724) fixedly connected to the two guide grooves (43). The air outlet pipe (724) is away from the delivery pipe (725) at one end of the corresponding air storage cylinder (721) and the air inlet pipe (726) is fixedly installed on one side of the two air storage cylinders (721). The ends of the two push rods (723) away from the corresponding piston (722) are fixedly connected to the two sliders (44). The ends of the two delivery pipes (725) away from the corresponding air outlet pipe (724) are respectively connected to the air blowing hole (71) on the arc groove (3) and the air blowing hole (71) on the semi-arc clamp (42).

6. The clamping device for bending steel pipes according to claim 5, characterized in that: Both of the aforementioned delivery pipes (725) are flexible hoses.

7. The clamping device for bending steel pipes according to claim 5, characterized in that: The concave frame (41) has a hollow structure (411) at the position below the semi-circular clamping block (42).

Images