Clamping device for steel pipe machining

Abstract

The invention discloses a steel pipe machining clamping device, and particularly relates to the technical field of metal machining machinery, the steel pipe machining clamping device comprises a device table, fixed conduction plates symmetrically arranged on the device table and a sliding loading plate connected to the fixed conduction plates in a sliding mode, and a rotatable rotating cylindrical block is installed on the sliding loading plate through a square fixing plate. A plurality of trapezoidal grooves are formed in the rotating cylindrical block in the circumferential direction, clamping square rods capable of moving in the radial direction are connected into the grooves through threaded rods, and a plurality of elastic cylindrical rods are connected to the clamping square rods through springs. The hydraulic cylinders drive the sliding loading plates to move oppositely so that the elastic cylindrical rods can stretch into the two ends of the steel pipe, then the clamping square rods can expand in the radial direction by rotating the threaded rods, the elastic cylindrical rods are tightly attached to the inner wall of the steel pipe under the action of the springs, and multi-point elastic clamping from the inner wall is achieved. The transmission system is driven by the motor to drive the clamped steel pipe to rotate, so that machining operation in the circumferential direction is facilitated. The device is stable in clamping, can effectively prevent the outer wall of the steel pipe from being damaged, and adapts to steel pipes of different specifications.

Description

Technical Field

[0001] This invention relates to the field of metal processing machinery technology, specifically to a steel pipe processing clamping device. Background Technology

[0002] Steel pipes are widely used in industrial production and construction. During their processing, they often require operations such as external turning, end face machining, circumferential drilling, surface grinding, or spraying. These processing operations usually require the steel pipe to be stably clamped and able to rotate.

[0003] Currently, external clamping chucks or ejector pins are commonly used for clamping steel pipes. External clamping chucks grip the steel pipe from the outside using jaws. While this method provides strong clamping force, it easily leaves indentations on the outer surface of the pipe, and can even cause deformation of thin-walled steel pipes, affecting product quality. This is especially true for steel pipes that have undergone surface treatment (such as plating or painting), where external clamping can easily cause surface damage. For processing long pipe fittings, a method of clamping with a chuck at one end and supporting with an ejector pin at the other is often used. However, preparing the center hole of the ejector pin adds a step, and there are interference issues when processing the middle part of the pipe fitting.

[0004] Furthermore, existing clamping devices are cumbersome to adjust when adapting to steel pipes of different diameters and lengths, and their automation level is low, affecting processing efficiency. For some special processing requirements that require internal support or clamping (such as flaring, flanging, or internal welding of accessories to the ends of steel pipes), traditional external clamping methods often cannot meet the requirements. Therefore, we propose a steel pipe processing clamping device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a steel pipe processing clamping device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A steel pipe processing clamping device includes a platform. A fixed guide plate is symmetrically fixedly connected to the top of the platform. Sliding loading plates, which can move closer to or further away from each other along their length, are slidably connected to the outer sides of each fixed guide plate. Square fixing plates are fixedly connected to the inner sidewalls of each sliding loading plate. Rotating cylindrical blocks are rotatably connected to the square fixing plates via bearings. The axis of the rotating cylindrical blocks is parallel to the axis of the steel pipe to be processed. Multiple snap-fit ​​square rods are slidably connected to each rotating cylindrical block. Multiple elastic cylindrical rods are slidably connected to the outer sides of each snap-fit ​​square rod. The distal end of each elastic cylindrical rod has an arc-shaped contact surface that can tightly fit against the inner wall of the steel pipe, and the elastic cylindrical rod can elastically rebound when in contact with the inner wall of the steel pipe.

[0007] Preferably, a first mounting bracket is symmetrically fixedly connected to the top of the device platform, a first transmission rod is rotatably connected between the first mounting brackets, a second mounting bracket is symmetrically fixedly connected between the first mounting brackets, a second transmission rod is rotatably connected between the first mounting brackets, and a connecting shaft is fixedly connected between the second transmission rod and the first transmission rod.

[0008] Preferably, a motor is installed on the top of the device platform, and a second transmission wheel is fixedly connected to the output shaft of the motor; a third transmission wheel is fixedly connected to the outside of the second transmission rod, and a first transmission belt is sleeved on the outside of the second transmission wheel and the third transmission wheel.

[0009] Preferably, the fixed transmission plate is symmetrically fixedly connected to the outside of a strip-shaped sliding block, and the sliding loading plate is symmetrically fixedly connected to the outside of a sliding guide rail, with the sliding guide rail and the strip-shaped sliding block being slidably connected; a hydraulic cylinder is installed on the outside of the fixed transmission plate, and the output end of the hydraulic cylinder is fixedly connected to the sliding loading plate.

[0010] Preferably, a connecting transmission shaft is fixedly connected to the external connecting shaft of the rotating cylindrical block, and a fourth transmission wheel is fixedly connected to the external connecting transmission shaft; a first transmission wheel is sleeved on the external side of the first transmission rod, and the first transmission wheel is slidably connected to the first transmission rod; a second transmission belt is sleeved on the external side of the first transmission wheel and the fourth transmission wheel.

[0011] Preferably, a movable pulley is fixedly connected to the outside of the first transmission wheel; an L-shaped frame is fixedly connected to the outside of the square fixed plate, and a ring is fixedly connected to the outside of the L-shaped frame, the ring extending into the movable pulley and rotatably connected to it.

[0012] Preferably, the rotating cylindrical block has multiple trapezoidal grooves on its outer surface, the snap-fit ​​square rod is slidably connected in the trapezoidal grooves, and the rotating cylindrical block is rotatably connected in the trapezoidal grooves with a threaded rod, the threaded rod being threadedly connected to the snap-fit ​​square rod.

[0013] Preferably, the snap-fit ​​square rod has multiple springs fixedly connected inside, and the springs are fixedly connected to the elastic cylindrical rod.

[0014] Preferably, each of the elastic cylindrical rods is fixedly connected to a silicone anti-slip pad, and the silicone anti-slip pad can fit against the inner wall of the steel pipe.

[0015] Preferably, the fixed guide plate is provided with a scale to indicate the moving distance of the sliding loading plate to accommodate steel pipes of different lengths, and the bottom of the device platform is provided with shock-absorbing feet.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This steel pipe processing clamping device, through a motor, transmission belt, and transmission shaft system, transmits power to a rotating cylindrical block, thereby driving the clamped steel pipe to rotate. This facilitates processing steps requiring workpiece rotation, such as turning, grinding, and spraying, eliminating the need for secondary clamping or additional drive equipment, thus improving processing efficiency. A hydraulic cylinder drives the sliding loading plate to move, allowing for rapid adjustment of the distance between the two clamping ends to accommodate steel pipes of different lengths. A graduated scale on the fixed transmission plate facilitates precise position setting. The moving pulleys and ring structure in the transmission system ensure that the transmission belt remains effective during distance adjustment, achieving linkage between clamping distance adjustment and power transmission, resulting in a high degree of automation.

[0017] 2. This steel pipe processing clamping device employs multiple sets of circumferentially distributed clamping square rods and elastic cylindrical rods, combined with spring buffers, to form a multi-point elastic clamping system. This structure not only evenly distributes clamping force, avoiding excessive local stress, but also adapts well to the diameter tolerances and minor irregularities of the inner wall of the steel pipe, ensuring stable and reliable clamping. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a frontal view of the structure in this invention; Figure 3 This is a schematic diagram of the side structure in this invention; Figure 4 This is a schematic diagram of the clamping component in this invention; Figure 5 This is a schematic diagram of the cross-section of the clamping component in this invention.

[0020] In the diagram: 1. Device platform; 201. First mounting bracket; 202. Second mounting bracket; 3. Connecting shaft; 4. First transmission wheel; 5. Moving pulley; 601. First transmission rod; 602. Second transmission rod; 7. Motor; 8. Second transmission wheel; 9. Third transmission wheel; 10. First transmission belt; 11. Fixed transmission plate; 12. Hydraulic cylinder; 13. Second transmission belt; 14. Sliding guide rail; 15. Sliding loading plate; 16. Strip sliding block; 17. L-shaped frame; 18. Ring sleeve; 19. Connecting transmission shaft; 20. Rotating cylindrical block; 21. Trapezoidal groove; 22. Threaded rod; 23. Snap-fit ​​square rod; 24. Elastic cylindrical rod; 25. Spring; 26. Fourth transmission wheel; 27. Square fixed plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example: Figures 1-5 As shown, the present invention provides a steel pipe processing clamping device, including a device platform 1. A fixed transmission plate 11 is symmetrically fixedly connected to the top of the device platform 1. Sliding loading plates 15 are slidably connected to the outside of the fixed transmission plates 11, which can move closer or further away from each other along their length direction. Square fixing plates 27 are fixedly connected to the inner side walls of the sliding loading plates 15. Rotating cylindrical blocks 20 are rotatably connected to the square fixing plates 27 through bearings. The axis of the rotating cylindrical blocks 20 is parallel to the axis of the steel pipe to be processed. Multiple snap-fit ​​square rods 23 are slidably connected to the rotating cylindrical blocks 20. Multiple elastic cylindrical rods 24 are slidably connected to the outside of the snap-fit ​​square rods 23. The distal end of the elastic cylindrical rods 24 is provided with an arc-shaped contact surface that can fit tightly against the inner wall of the steel pipe, and the elastic cylindrical rods 24 can elastically rebound when in contact with the inner wall of the steel pipe.

[0023] It should be noted that in this embodiment, the sliding loading plate 15 is driven by a hydraulic cylinder to move along the fixed transmission plate 11 to adjust the distance between the two rotating cylindrical blocks 20 to accommodate steel pipes of different lengths; the rotating cylindrical blocks 20 are used to install the internal clamping components and transmit rotational power; the snap-fit ​​square rod 23 and the elastic cylindrical rod 24 constitute a radial clamping unit, which achieves uniform and non-destructive clamping of the pipe wall from the inside of the steel pipe through radial expansion and elastic contact.

[0024] The top of the device platform 1 is symmetrically and fixedly connected with a first mounting bracket 201. A first transmission rod 601 is rotatably connected between the first mounting brackets 201. A second mounting bracket 202 is symmetrically and fixedly connected between the first mounting brackets 201. A second transmission rod 602 is rotatably connected between the first mounting brackets 201. A connecting shaft 3 is fixedly connected between the second transmission rod 602 and the first transmission rod 601.

[0025] It should be noted that, in this embodiment, the first mounting bracket 201 and the second mounting bracket 202 provide stable support for the transmission rod; the first transmission rod 601 and the second transmission rod 602 are connected as one unit by the connecting shaft 3 to form a rigid long transmission shaft, which is used to transmit power from one end of the device to the other end to ensure that the clamping units on both sides can rotate synchronously.

[0026] A motor 7 is mounted on the top of the device platform 1. The output shaft of the motor 7 is fixedly connected to a second transmission wheel 8. A third transmission wheel 9 is fixedly connected to the outside of the second transmission rod 602. A first transmission belt 10 is sleeved on the outside of the second transmission wheel 8 and the third transmission wheel 9.

[0027] It should be noted that in this embodiment, the motor 7 serves as a power source, transmitting rotational motion to the second transmission rod 602 through the second transmission wheel 8, the first transmission belt 10, and the third transmission wheel 9, thereby driving the entire transmission shaft system to rotate.

[0028] A strip-shaped sliding block 16 is symmetrically fixedly connected to the outside of the fixed transmission plate 11, and a sliding guide rail 14 is symmetrically fixedly connected to the outside of the sliding loading plate 15. The sliding guide rail 14 and the strip-shaped sliding block 16 are slidably connected. A hydraulic cylinder 12 is installed on the outside of the fixed transmission plate 11, and the output end of the hydraulic cylinder 12 is fixedly connected to the sliding loading plate 15.

[0029] It should be noted that, in this embodiment, the sliding pair formed by the sliding guide rail 14 and the strip sliding block 16 ensures that the sliding loading plate 15 can only move smoothly in a straight line along the length direction of the fixed transmission plate 11; the hydraulic cylinder 12, as the actuator, provides power to drive the sliding loading plate 15 and its clamping components to perform axial feeding or retraction, thereby realizing the clamping and unloading of the steel pipe.

[0030] A connecting shaft 19 is fixedly connected to the outside of the connecting shaft of the rotating cylindrical block 20, and a fourth transmission wheel 26 is fixedly connected to the outside of the connecting shaft 19; a first transmission wheel 4 is sleeved on the outside of the first transmission rod 601, and a second transmission belt 13 is sleeved on the outside of the first transmission wheel 4 and the fourth transmission wheel 26.

[0031] It should be noted that in this embodiment, the first transmission wheel 4 transmits the rotational motion of the transmission shaft 601 to the fourth transmission wheel 26 through the second transmission belt 13, and then drives the rotating cylindrical block 20 to rotate through the connecting transmission shaft 19, thereby transmitting the driving force to the clamped steel pipe. The first transmission rod 601 has a keyway on its outside, and the first transmission wheel 4 can move on the first transmission rod 601 under the action of the keyway, but cannot rotate relative to the first transmission rod 601.

[0032] The first transmission wheel 4 is externally fixedly connected to a movable pulley 5; the square fixed plate 27 is externally fixedly connected to an L-shaped frame 17, and the L-shaped frame 17 is externally fixedly connected to a ring 18, which extends into the movable pulley 5 and is rotatably connected to it.

[0033] It should be noted that in this embodiment, when the sliding loading plate 15 moves to adjust the spacing, the L-shaped frame 17 and the ring 18 drive the movable pulley 5 and the first transmission wheel 4 to slide synchronously along the first transmission rod 601, thereby automatically keeping the second transmission belt 13 in a taut state and ensuring the reliability of power transmission. The ring 18 extends into the movable pulley 5 and can pull the first transmission wheel 4 to move on the first transmission rod 601. The ring 18 and the movable pulley 5 can rotate, but there will be no relative displacement.

[0034] The rotating cylindrical block 20 has multiple trapezoidal grooves 21 on its outside. A snap-fit ​​square rod 23 is slidably connected in the trapezoidal grooves 21. A threaded rod 22 is rotatably connected to the rotating cylindrical block 20 in the trapezoidal grooves 21. The threaded rod 22 is threadedly connected to the snap-fit ​​square rod 23.

[0035] It should be noted that in this embodiment, the trapezoidal groove 21 serves to guide and prevent the square rod 23 from dislodging; by rotating the threaded rod 22, the square rod 23 is driven to make precise radial movement within the trapezoidal groove 21 using the thread pair, thereby achieving the application and release of clamping force, and maintaining a stable clamping state by utilizing the self-locking property of the thread.

[0036] Multiple springs 25 are fixedly connected inside the snap-fit ​​square rod 23, and the springs 25 are fixedly connected to the elastic cylindrical rod 24.

[0037] It should be noted that, in this embodiment, the spring 25 provides elastic preload to the elastic cylindrical rod 24, so that it can generate buffer when it contacts the inner wall of the steel pipe and adapt to the slight irregularity or diameter tolerance of the pipe wall, thereby achieving multi-point elastic clamping and avoiding local stress concentration or damage caused by rigid contact.

[0038] All external parts of the elastic cylindrical rod 24 are fixedly connected with silicone anti-slip pads, and the silicone anti-slip pads can fit against the inner wall of the steel pipe.

[0039] It should be noted that, in this embodiment, the silicone anti-slip pad increases the friction between the elastic cylindrical rod 24 and the inner wall of the steel pipe, preventing slippage when driving the steel pipe to rotate; at the same time, its flexible properties can further protect the inner wall of the steel pipe, avoid scratches, and achieve non-destructive clamping.

[0040] The fixed transmission plate 11 is equipped with a scale to indicate the moving distance of the sliding loading plate 15, so as to adapt to steel pipes of different lengths. The bottom of the device platform 1 is equipped with shock-absorbing feet.

[0041] It should be noted that, in this embodiment, the scale allows the operator to accurately and quickly adjust the distance between the two sliding loading plates 15 to accurately fit steel pipes of different lengths and improve clamping efficiency; the shock-absorbing feet are used to absorb and isolate the vibration generated during the operation of the device, thereby improving the stability and accuracy of the processing.

[0042] In summary, when using this steel pipe processing clamping device, the hydraulic cylinder 12 is controlled to drive the two sliding loading plates 15 to move in opposite directions or in the opposite direction according to the length of the steel pipe, and the distance between the two rotating cylindrical blocks 20 is adjusted to be slightly less than the length of the steel pipe by means of a scale. During the movement, the ring 18 drives the first transmission wheel 4 to slide to keep the second transmission belt 13 taut. The steel pipe is placed on the device platform 1, with its axis aligned with the rotating cylindrical block 20 and its ends aligned with the clamping assembly. The hydraulic cylinder 12 is controlled to move the sliding loading plate 15 towards each other, sending the rotating cylindrical block 20 and its clamping square rod 23 and elastic cylindrical rod 24 into both ends of the steel pipe until they contact the inner wall. The threaded rods 22 are rotated, driving the clamping square rod 23 to expand radially along the trapezoidal groove 21. The spring 25 causes the silicone anti-slip pad of the elastic cylindrical rod 24 to elastically press against the inner wall of the steel pipe, achieving self-locking clamping. The motor 7 is started, and the power is transmitted through the transmission system, ultimately driving the rotating cylindrical block 20 and rotating the steel pipe for turning, grinding, and other operations. After the processing is completed, the motor 7 is stopped, the threaded rod 22 is rotated in the opposite direction to release the clamping, and the hydraulic cylinder 12 is controlled to exit the clamping assembly, allowing the steel pipe to be removed.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel pipe processing clamping device, comprising a device table (1), characterized in that: The top of the device platform (1) is symmetrically fixedly connected with a fixed transmission plate (11). The outside of the fixed transmission plate (11) is slidably connected with a sliding loading plate (15) that can move closer or further away from it along its length. The inner sidewalls of the sliding loading plate (15) are fixedly connected with square fixing plates (27). A rotating cylindrical block (20) is rotatably connected to the square fixing plate (27) through a bearing. The axis of the rotating cylindrical block (20) is parallel to the axis of the steel pipe to be processed. The rotating cylindrical block (20) is slidably connected with multiple snap-fit ​​square rods (23). The outside of the snap-fit ​​square rods (23) is slidably connected with multiple elastic cylindrical rods (24). The far end of the elastic cylindrical rod (24) is provided with an arc-shaped contact surface that can fit tightly against the inner wall of the steel pipe. When the elastic cylindrical rod (24) contacts the inner wall of the steel pipe, it can elastically rebound.

2. The steel pipe processing clamping device according to claim 1, characterized in that: The top of the device platform (1) is symmetrically and fixedly connected with a first mounting bracket (201), and a first transmission rod (601) is rotatably connected between the first mounting brackets (201). A second mounting bracket (202) is symmetrically and fixedly connected between the first mounting brackets (201), and a second transmission rod (602) is rotatably connected between the first mounting brackets (201). A connecting shaft (3) is fixedly connected between the second transmission rod (602) and the first transmission rod (601).

3. The steel pipe processing clamping device according to claim 2, characterized in that: A motor (7) is installed on the top of the device platform (1), and the output shaft of the motor (7) is fixedly connected to a second transmission wheel (8); a third transmission wheel (9) is fixedly connected to the outside of the second transmission rod (602), and a first transmission belt (10) is sleeved on the outside of the second transmission wheel (8) and the third transmission wheel (9).

4. The steel pipe processing clamping device according to claim 3, characterized in that: The fixed transmission plate (11) is symmetrically fixedly connected to a strip-shaped sliding block (16), and the sliding loading plate (15) is symmetrically fixedly connected to a sliding guide rail (14). The sliding guide rail (14) and the strip-shaped sliding block (16) are slidably connected. A hydraulic cylinder (12) is installed on the outside of the fixed transmission plate (11), and the output end of the hydraulic cylinder (12) is fixedly connected to the sliding loading plate (15).

5. A steel pipe processing clamping device according to claim 4, characterized in that: The connecting shaft of the rotating cylindrical block (20) is fixedly connected to a connecting transmission shaft (19), and the connecting transmission shaft (19) is fixedly connected to a fourth transmission wheel (26); the first transmission rod (601) is sleeved with a first transmission wheel (4), and the first transmission wheel (4) is slidably connected to the first transmission rod (601); the first transmission wheel (4) and the fourth transmission wheel (26) are sleeved with a second transmission belt (13).

6. The steel pipe processing clamping device according to claim 5, characterized in that: The first transmission wheel (4) is fixedly connected to a movable pulley (5); the square fixed plate (27) is fixedly connected to an L-shaped frame (17), and the L-shaped frame (17) is fixedly connected to a ring sleeve (18), which extends into the movable pulley (5) and is rotatably connected to it.

7. A steel pipe processing clamping device according to claim 6, characterized in that: The rotating cylindrical block (20) has multiple trapezoidal grooves (21) on its outside. The snap-fit ​​square rod (23) is slidably connected in the trapezoidal groove (21). The rotating cylindrical block (20) is rotatably connected in the trapezoidal groove (21) with a threaded rod (22). The threaded rod (22) is threadedly connected to the snap-fit ​​square rod (23).

8. A steel pipe processing clamping device according to claim 7, characterized in that: The snap-fit ​​square rod (23) has multiple springs (25) fixedly connected inside, and the springs (25) are fixedly connected to the elastic cylindrical rod (24).

9. A steel pipe processing clamping device according to claim 8, characterized in that: All of the elastic cylindrical rods (24) are fixedly connected to silicone anti-slip pads on the outside, and the silicone anti-slip pads can fit against the inner wall of the steel pipe.

10. A steel pipe processing clamping device according to claim 9, characterized in that: The fixed transmission plate (11) is provided with a scale to indicate the moving distance of the sliding loading plate (15) to accommodate steel pipes of different lengths. The bottom of the device platform (1) is provided with shock-absorbing feet.

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