Open type tooth mark-free clamping device for hydraulic power tongs

Abstract

According to the tooth mark-free clamping device of the open type hydraulic power tongs, an oil cylinder is fixed on a shell, a piston rod of the oil cylinder is fixed on an open pressure plate with a friction plate, and a wedge bolt is fixed on the friction plate; the gear cover is fixed on the open gear, the jaw plate frame with the slideways is arranged on the open gear, the reset spring and the jaw plate are arranged between the slideways, the clamping tile seat is fixed on the jaw plate, and the toothless soft clamping tile is fixed on the clamping tile seat. Due to the fact that the wedge bolt is in contact connection with the jaw plate, the oil cylinder works to pull the pressing disc to drive the wedge bolt to downwards press the jaw plate, the jaw plate drives the clamping tile base and the tooth-free soft clamping tile to move towards the center, the tooth-mark-free clamping tile clamps a pipe body or a coupling, and damage to different degrees to the outer surface of the pipe body or the coupling is avoided. When the clamping force is reached, the hydraulic motor drives the opening gear to rotate, the clamping device is driven to unload or tighten the pipe body or the coupling, and the pipe body or the coupling is prevented from being damaged by rotation during clamping. The repeated utilization rate of the pipe body and the coupling is improved, and economic losses are reduced.

Description

I. Technical Field

[0001] This utility model relates to an open-type hydraulic power clamp without tooth marks, and more particularly to an open-type hydraulic power clamp without tooth marks used for disassembling and assembling well pipes and pipe couplings and other threaded connections during well repair in oil fields. II. Background Technology

[0002] Prior to this invention, open-type hydraulic power clamps were internal curved surface climbing or planetary claw external curved surface climbing clamping devices, requiring the installation of jaw plates to clamp the pipe body, and rotation and clamping were performed simultaneously. During operation, the jaw plates clamped the pipe body or couplings and rotated to engage and disengage, leaving indentations on the clamped surface, causing varying degrees of irreparable damage to the outer surface of the pipe body or couplings. Because the device rotated and clamped simultaneously, the clamping force on the pipe body or couplings was difficult to control, easily leading to more severe damage (especially to fiberglass pipes). Damaged oil well pipes and couplings could only be cut and re-threaded or replaced with new couplings. Due to frequent maintenance of oil wells in oil fields, there was significant waste of oil well pipes and couplings, resulting in substantial economic losses. III. Summary of the Invention

[0003] The purpose of this invention is to provide an open-type hydraulic power clamping device with no tooth marks. This device achieves tooth mark-free clamping and separates clamping and rotation, preventing damage to the pipe body or coupling surface, ensuring quality, and avoiding economic losses. It is particularly important for special oil well pipes or fiberglass oil well pipes with high requirements for external surface finish.

[0004] The technical solution adopted to achieve the purpose of this utility model is: an open-type hydraulic power clamping device without tooth marks, including a nut, a flat washer, an open pressure plate, a pressure plate screw, an open pressure plate, a friction plate screw, an open friction plate, a head cover plate, a cylinder, a housing, a cylinder seat, a floating roller assembly, an open gear, a wedge pin, a jaw plate, an open gear cover, an open jaw plate frame, a return spring, a clamping shoe seat, a positioning screw, and a toothless soft clamping shoe; the cylinder is fixed to the housing by the cylinder seat, and the cylinder piston rod is fixed to the open pressure plate by the nut and the flat washer; the open pressure plate... The opening friction plate is fixed to the opening pressure plate by pressure plate screws, and the wedge pin is fixed to the opening friction plate by friction plate screws. The housing is equipped with a machine head cover plate, and cylinder seats are installed on both sides. The floating roller assembly is installed inside, and the floating roller assembly is rolledly connected to the opening gear. The opening gear cover is fixed to the opening gear. The opening gear is equipped with a jaw plate frame with slide rails. A return spring and a jaw plate are installed between the slide rails of the jaw plate frame. A clamping pad seat is fixed to the jaw plate by positioning screws, and a toothless soft clamping pad is fixed on the clamping pad seat.

[0005] This utility model relates to an open-type hydraulic power clamping device with no tooth marks. Due to the frictional contact between the wedge pin and the upper part of the jaw plate, the hydraulic cylinder pulls the open pressure plate, causing the wedge pin to feed and press down on the jaw plate. This allows the jaw plate to slide along the slide rails on the jaw plate frame, guiding the clamping pad and the toothless flexible clamping pad towards the center, achieving toothless clamping of the pipe body or coupling. When the clamping force is reached, the gearbox and hydraulic motor drive the open gear to rotate. The open gear then drives the toothless clamping device to unload or tighten the pipe body or coupling, preventing rotational damage to the pipe body or coupling during clamping.

[0006] The beneficial effects of this utility model are as follows: This open-type hydraulic power clamping device with no tooth marks uses toothless soft clamping pads to clamp the pipe or coupling without damaging the outer surface of the pipe or coupling, thus avoiding varying degrees of irreparable damage. Furthermore, because clamping and rotation are operated independently, the clamping force is controllable; rotation is only performed when the clamping force is reached, avoiding damage to the pipe or coupling during clamping. This improves the reusability of oil well pipes and couplings, reducing economic losses. IV. Description of the attached drawings

[0007] Figure 1 This is a half-sectional view of the main view of this utility model.

[0008] Figure 2 This is a top view of the present invention.

[0009] Figure 3 This is a diagram of the gear rotation power transmission of this utility model. V. Detailed Implementation Methods

[0010] A toothless clamping device for an open-end hydraulic power pliers includes a nut 1, a flat washer 2, an open-end pressure plate 3, a pressure plate screw 4, an open-end pressure plate 5, a friction plate screw 6, an open-end friction plate 7, a head cover 8, a cylinder 9, a housing 10, a cylinder seat 11, a floating roller assembly 12, an open-end gear 13, a wedge pin 14, a jaw plate 15, an open-end gear cover 16, an open-end jaw plate frame 17, a return spring 19, a clamping shoe seat 20, a positioning screw 23, and a toothless flexible clamping shoe 24. The cylinder 9 is fixed to the housing 10 via the cylinder seat 11. The cylinder piston rod is fixed to the open-end pressure plate 3 via the nut 1 and the flat washer 2. The open-end pressure plate 5 is fixed to the open-end pressure plate 3 via the pressure plate screw 4. The open-end friction plate 7 is placed... Between the opening pressure plate 5 and the opening pressure plate 3, the wedge pin 14 is fixed to the opening friction plate 7 by the friction plate screw 6; the housing 10 is equipped with a machine head cover plate 8, and cylinder seats 11 are installed on both sides. Multiple floating roller assemblies 12 are installed inside. The floating roller assembly 12 is tactilely connected to the opening gear 13 (the floating roller assembly 12 is equivalent to a bearing, supporting the rotation of the opening gear 13); the opening gear cover 16 is fixed on the opening gear 13, and the opening gear 13 is equipped with a jaw plate frame 17 with a slide. A return spring 19 and a jaw plate 15 are installed between the slides of the jaw plate frame 17. The jaw plate 15 is fixed with a clamping pad seat 20 by a positioning screw 23, and a toothless soft clamping pad 24 is fixed on the clamping pad seat 20.

[0011] This utility model relates to an open-type hydraulic power clamping device with no tooth marks. Because the wedge pin 14 is in frictional contact with the upper part of the jaw plate 15, the hydraulic cylinder 11 pulls the open pressure plate 3, causing the wedge pin 14 to feed and press down on the jaw plate 15. This allows the jaw plate 15 to slide along the slide rail on the jaw plate frame 17, guiding the clamping pad 20 and the toothless flexible clamping pad 24 towards the center, achieving toothless clamping of the pipe or coupling. After clamping the pipe or coupling, when the clamping force is reached, the open gear is driven to rotate via a gearbox and hydraulic motor. Because the open gear is fixedly connected to the open gear cover, the open gear drives the toothless clamping device to unload or tighten the pipe or coupling, preventing rotational damage to the pipe or coupling during clamping. This utility model of an open-type hydraulic power clamping device with no tooth marks, using toothless flexible clamping pads to clamp the pipe or coupling, does not damage the outer surface of the pipe or coupling, avoiding varying degrees of irreparable damage to the outer surface of the pipe or coupling. Furthermore, because clamping and rotation are operated independently, the clamping force is controllable. Rotation only occurs when the clamping force is reached, avoiding damage to the pipe body or couplings during clamping. This improves the reusability of oil well pipes and couplings, reducing economic losses.

Claims

1. An open hydraulic power tongs without tooth mark clamping device, comprising a nut, a flat pad, an open pressure plate, a pressure plate screw, an open pressure plate, a friction plate screw, an open friction plate, a machine head cover plate, an oil cylinder, a shell, an oil cylinder seat, a floating roller assembly, an open gear, a wedge plug, an e-plate, an open gear cover, an open e-plate frame, a return spring, a clamping shoe seat, a positioning screw, a toothless soft clamping shoe; characterized in that: The oil cylinder (9) is fixed on the shell (10) through the oil cylinder seat (11), the oil cylinder piston rod is fixed on the open pressure disc (3) through the nut (1) and the flat washer (2), the open pressure plate (5) is fixed on the open pressure disc (3) through the pressure plate screw (4), the open friction plate (7) is fixed between the open pressure plate (5) and the open pressure disc (3), and the wedge body bolt (14) is fixed on the open friction plate (7) through the friction plate screw (6); The shell (10) is provided with the machine head cover plate (8), the oil cylinder seat (11) is arranged on both sides, the floating roller assembly (12) is arranged in the shell (10), the floating roller assembly (12) is in rolling connection with the open gear (13), the open gear cover (16) is fixed on the open gear (13), the e-plate frame (17) with a slide is arranged on the open gear (13), the reset spring (19) and the e-plate (15) are arranged between the slides of the e-plate frame (17), the e-plate (15) is fixed with the jaw seat (20) through the positioning screw (23), and the jaw seat (20) is fixed with the toothless soft jaw (24).

Images