CN201227794Y - Gripping apparatus of circular cross section pipes - Google Patents

Abstract

The utility model disclose a clamping device for round-section pipe materials, which is characterized in that a fixed frame (1) and a slideway disk (2) are concentric and relatively fixed; 3 to 7 radial direction slideways are evenly distributed on the axial end face of the slideway disk (2); a clamping slide block (3) which slides along the slideway is mounted on each slideway; a saw-tooth jack catches are formed at the inner ends of the clamping slide blocks (3); a roller (4) is arranged at the outer end of each clamping slide block (3); and an inner cam disk (5) which can rotate around the center of the fixed frame (1) is further arranged thereon. The clamping device drives the 3 to 7 jack catches to clamp a steel pipe by an inner cam, thereby dispensing with a complex multi-rod mechanism, increasing jack catches, and achieving the purposes that the structure of the clamping device is simple, and the clamping concentricity is reliable; the clamping strength is high and the clamped steel pipe can not deform.

Description

Clamping device for round section pipe

technical field

The utility model relates to a clamping device for circular cross-section pipes, in particular to a clamping mechanism for fixing pipes when a rolling cutter cuts circular cross-section pipes.

Background technique

At present, more and more rolling cutting machines are used to cut cut-to-length pipes on the high-frequency longitudinal welded pipe production line. When the hobbing machine cuts the pipe, the pipe must be clamped and fixed, and the center of the clamped pipe must be coaxial with the rotation center of the hobbing machine. The clamping device widely used now is to push the multi-bar mechanism through the hydraulic cylinder, so that the two claws clamp the pipe from left to right or up and down. The name disclosed in Chinese patent CN2808438Y is "new steel pipe clamping device". In actual production, eccentricity is prone to occur in such a clamping method, resulting in the phenomenon that the steel pipe is cut continuously (the incision is partially adhered and not broken), and the hob blade is also easily damaged. In addition, since the steel pipe is clamped by two claws, when the clamping force is increased, the steel pipe is easily deformed by the clamp and a waste product is produced.

Contents of the invention

In order to overcome the above-mentioned shortcomings in the prior art, the utility model provides a circular section pipe clamping device, which is a device in which a rotatable inner cam simultaneously pushes 3-7 claws to clamp the steel pipe. The device has the advantages of simple structure, reliable concentricity, large clamping force, and the steel pipe will not be deformed by clamping.

The technical solution to achieve the above purpose is: the clamping device for the circular cross-section pipe has a fixed frame and a concentrically fixed slideway disk on it, and 3-7 diameters are evenly distributed on the axial end surface of the slideway disk. To the slideway, a clamping slider that can slide along the slideway is installed on each slideway. The inner end of the clamping slider is processed with serrated claws for clamping the steel pipe, and its outer end is provided with a roller. An inner cam disc that can rotate around its center is installed on the fixed frame at the same time, and the radial inner side of this inner cam disc is evenly distributed with 3-7 segments of identical cam curved surfaces. Each segment of the cam surface is composed of an involute surface and an arc surface connected smoothly, and each segment of the cam surface is connected end to end on the same circumference to form a closed inner cam surface. The clamping slider is reset by a spring, so that the roller is close to the curved surface of the inner cam. A hinge shaft is fixed on the outer side of the inner cam disc, and is connected with the hydraulic cylinder through the hinge shaft, and the action of the hydraulic cylinder can make the inner cam disc rotate. When the piston rod of the hydraulic cylinder is stretched out, the inner cam disc is pushed to rotate counterclockwise, and the curved surface of the inner cam on it presses the roller to make the clamping slider compress the spring and move toward the center along the slideway on the slideway disc, so that 3 -The claws on the 7 clamping sliders clamp the steel pipe at the same time. When the piston rod of the hydraulic cylinder is retracted, the inner cam disc is pulled to rotate clockwise, and the spring pushes the clamping slider to reset and release the steel pipe, thus completing a clamping cycle.

The beneficial effect of the utility model is: due to the design, an inner cam can push 3-7 claws to clamp the steel pipe at the same time, which saves the complex multi-bar mechanism and increases the claws. The purpose of simple structure of the clamping device, reliable clamping concentricity, large clamping force and no deformation of the steel pipe by clamping is realized.

Description of drawings

Fig. 1 is a structural schematic diagram of a clamping device for a pipe with a circular section.

In Figure 1, 1. fixed frame, 2. slide disc, 3. clamping slider, 4. roller, 5. inner cam disc, 6. return spring, 7. hinge shaft, 8. hydraulic cylinder .

Detailed ways

The following describes the utility model and all its beneficial effects in detail in conjunction with the embodiments of the accompanying drawings, aiming to help readers better understand the essence of the utility model, but not to limit the implementation and protection scope of the utility model.

Fig. 1 is a clamping device for a circular section pipe disclosed by the utility model, which has a fixed frame 1 and a slide disc 2 concentrically fixed on it, and is evenly distributed on the axial end surface of the slide disc 2 There are three radial slideways, and a clamping slider 3 that can slide along the slideway is installed on each slideway. The inner end of the clamping slider 3 is processed with serrated claws for clamping the steel pipe, and the outer end is provided with There is a scroll wheel 4. On the fixed frame 1, an inner cam disc 5 that can rotate around its center is installed simultaneously, and the radial inner side of this inner cam disc 5 is evenly distributed with three identical cam curved surfaces. Each segment of the cam surface is composed of an involute surface and an arc surface connected smoothly, and the three segments of the cam surface are connected end to end on the same circumference to form a closed inner cam surface. Back-moving springs 6 are installed on both sides of the clamping slide block 3, so that the roller 4 is close to the curved surface of the inner cam. A hinge shaft 7 is fixed on the outside of the inner cam disc 5, which is connected to the hydraulic cylinder 8 through the hinge shaft 7, and the action of the hydraulic cylinder 8 can make the inner cam disc 5 rotate. When the piston rod of the hydraulic cylinder 8 is stretched out, the inner cam disc 5 is pushed to rotate counterclockwise, and the curved surface of the inner cam on it presses the roller 4 so that the clamping slider 5 compresses the spring 6 and moves along the slideway on the slide disc 2 Move towards the center, so that the claws on the three clamping slide blocks 3 clamp the steel pipe simultaneously. When the piston rod of the hydraulic cylinder 8 retracts, the inner cam disc 5 is pulled to rotate clockwise, and the spring 6 pushes the clamping slider 3 to reset and release the steel pipe, thus completing a clamping cycle.

Claims (3)

1. A circular cross-section pipe clamping device, characterized in that: the fixed frame (1) and the slideway disc (2) are concentric and relatively fixed, and are evenly distributed on the axial end surface of the slideway disc (2). 3-7 radial slideways, a clamping slider (3) sliding along the slideway is installed on each slideway, the inner end of the clamping slider (3) is processed with serrated claws, and its outer end is provided with A roller (4) is arranged; An inner cam disc (5) that can rotate around its center is installed simultaneously on the fixed frame (1). 2. The circular cross-section pipe clamping device according to claim 1, characterized in that: 3-7 sections of the same cam curved surface are evenly distributed on the radially inner side of the inner cam disc (5), and each section of the cam curved surface They are all formed by the smooth connection of involute surfaces and arc surfaces, and the cam surfaces of each section are connected end to end on the same circumference to form a closed inner cam surface. 3. The round-section pipe clamping device according to claim 1, characterized in that: the clamping slider (3) is provided with a return spring (6), so that the roller (4) is closely attached to the curved surface of the inner cam superior.

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