Clamp head reset mechanism of open-end power tongs

Abstract

The present invention provides a jaw reset mechanism for an open-type power tong, comprising a slewing mechanism, a lifting mechanism, and a braking mechanism. The lifting mechanism is mounted on the tong body of the power tong. The lifting mechanism, the brake disc, and the floating body of the power tong are all connected to the slewing mechanism. The brake disc and brake band fixing post of the power tong are also connected to the braking mechanism. This invention offers the advantages of convenient switching and resetting, and reduces wear on the brake band.

Description

Technical Field

[0001] The invention relates to a clamp head reset mechanism of a power tongs, in particular to a clamp head reset mechanism of an open-type power tongs used for oil and gas mine operations. Background Art

[0002] When a typical cam-type clamping caliper clamps a pipe, the brake disc and float rotate relative to each other by a certain angle, causing their relative positions to change. Before the caliper can proceed with the next make-up or break-out operation, the brake disc and float must be restored to their initial open alignment. Therefore, a reset mechanism is incorporated into the caliper head, typically achieved by inserting or removing a positioning pin or rotating an open sleeve. This requires manual operation and is not automated. To achieve relative rotation between the brake disc and float, a brake band must be installed around the outside of the disc. In typical power calipers, the band remains firmly attached to the outer diameter of the disc, consuming the caliper head's output torque and causing the band to wear rapidly. Summary of the Invention

[0003] The purpose of the present invention is to provide a clamp head reset mechanism for an open-type power tongs, so as to solve the above-mentioned technical problems of inconvenient switching and resetting and rapid wear during braking.

[0004] The present invention proposes a clamp head reset mechanism for an open-type power tong, which includes a rotating mechanism, a lifting mechanism and a braking mechanism. The lifting mechanism is installed on the clamp body of the power tong, and the lifting mechanism, the brake disc and the floating body on the power tong are all connected to the rotating mechanism. The brake disc and the brake band fixing column on the power tong are all connected to the braking mechanism.

[0005] In certain embodiments, the lifting mechanism includes a lifting slide frame, a lifting cylinder and a guide bracket. The guide bracket is fixedly mounted on the clamp body of the power tongs. The guide bracket is provided with a sliding groove. The bottom of the lifting slide frame is embedded in the sliding groove. The lifting slide frame and the guide bracket are both connected to the lifting cylinder, and the rotary mechanism is connected to the lifting slide frame.

[0006] In certain embodiments, the lifting cylinder connects the lifting slide frame and the guide bracket together through an upper hinge pin and a lower hinge pin, and the lifting slide frame moves up and down along the sliding groove under the action of the lifting cylinder.

[0007] In certain embodiments, the rotary mechanism includes a rotary cylinder, a slotted rotary sleeve, a reset rotary sleeve and a reset pin. The rotary cylinder is fixed on the lifting sliding frame, the slotted rotary sleeve is fixed on the end of the rotary cylinder shaft, the bottom of the slotted rotary sleeve corresponds to the reset rotary sleeve and a groove body with an opening facing downward is provided. The reset rotary sleeve is movably installed on the fixed brake disc, the reset pin is fixed on the floating body, and the upper end of the reset pin is embedded in the missing edge sleeve at the lower part of the reset rotary sleeve.

[0008] In certain embodiments, the notched sleeve is semicircular.

[0009] In certain embodiments, the braking mechanism includes a left brake band, a right brake band, a left connecting rod, a right connecting rod and a pneumatic adjustment cylinder. The left brake band and the right brake band are respectively connected to one end of the left connecting rod and one end of the right connecting rod, and the other end of the left connecting rod and the other end of the right connecting rod are both connected to the pneumatic adjustment cylinder. The middle part of the left connecting rod and the middle part of the right connecting rod are installed on the brake band fixing column, and the left brake band and the right brake band are surrounded by the outer circle of the brake disc.

[0010] In some embodiments, the braking mechanism further includes a first hinge pin, a second hinge pin, a third hinge pin and a fourth hinge pin, the left brake band is hinged to the left connecting rod through the first hinge pin, the right brake band is hinged to the right connecting rod through the fourth hinge pin, the pneumatic adjusting cylinder is hinged to the left connecting rod through the second hinge pin, and the pneumatic adjusting cylinder is hinged to the right connecting rod through the third hinge pin.

[0011] The advantages of the clamp head reset mechanism of the open-type power tongs of the present invention are: reasonable structure, convenient switching and resetting, effective reduction of brake band wear, and realization of an automatically controlled clamp head reset mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of the clamp head reset mechanism of the open-end power tongs in one embodiment of the present invention;

[0013] Figure 2 A schematic structural diagram of a rotary mechanism in one embodiment of the present invention;

[0014] Figure 3 This is a structural diagram of a lifting mechanism in one embodiment of the present invention;

[0015] Figure 4 Schematic diagram of the structure of a braking mechanism in one embodiment of the present invention. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the present invention proposes a clamp head reset mechanism for an open-type power tongs, including a rotating mechanism 5, a lifting mechanism 6 and a braking mechanism 3. The lifting mechanism 6 is installed on the clamp body of the power tongs, and the lifting mechanism 6, the brake disc 2 and the floating body 4 on the power tongs are all connected to the rotating mechanism 5. The brake disc 2 and the brake band fixing column 7 on the power tongs are all connected to the braking mechanism 3.

[0017] Among them, Figure 3As shown, the lifting mechanism 6 includes a lifting slide 22, a lifting cylinder 23 and a guide bracket 24. The guide bracket 24 is fixedly mounted on the clamp body of the power tongs. A sliding groove is provided on the guide bracket 24. The bottom of the lifting slide 22 is embedded in the sliding groove. The lifting cylinder 23 connects the lifting slide 22 and the guide bracket 24 together through the upper hinge pin 21 and the lower hinge pin 25. The rotary mechanism 5 is connected to the lifting slide 22. The lifting slide 22 moves up and down along the sliding groove under the action of the lifting cylinder 23.

[0018] Among them, Figure 2 As shown, the rotary mechanism 5 includes a rotary cylinder 31, a slotted rotary sleeve 32, a reset rotary sleeve 33 and a reset pin 34. The rotary cylinder 31 is fixed on the lifting slide frame 22, and the slotted rotary sleeve 32 is fixed (can be fixed by welding technology or by screws, etc.) on the shaft end of the rotary cylinder 31 (motor). The slotted rotary sleeve 32 rotates with the rotary cylinder 31 and moves up and down as a whole with the lifting slide frame 22. The shape, size and position of the top of the reset rotary sleeve 33 correspond to the shape, size and position of the groove body with the bottom opening downward of the slotted rotary sleeve 32. The reset rotary sleeve 33 is movably mounted on the fixed brake disc 2 (a circle of auxiliary sliders can be set on the periphery of the reset rotary sleeve 33 to be used on the brake disc 2). A sliding seat with a through hole is connected by screws, a sliding groove is set on the wall of the through hole, and then the reset sleeve 33 is embedded in the through hole, and the auxiliary slider is embedded in the sliding groove, so that the auxiliary slider can rotate along the sliding groove in the sliding groove, thereby forming the purpose of movable installation). It can realize its own rotation through the rotary cylinder 31 and rotate with the brake disc 2. The bottom of the reset pin 34 is inserted into the floating body 4 to form a fixed connection. The reset pin 34 rotates with the floating body 4. The upper end of the reset pin 34 is embedded in the semicircular missing-edge sleeve at the bottom of the reset sleeve 33. The missing-edge sleeve can limit the rotation direction of the reset pin 34, so that the reset pin 34 is blocked by the missing-edge sleeve on one side, and the reset pin 34 can rotate freely on the other side.

[0019] Among them, Figure 4As shown, the brake mechanism 3 includes a left brake band 11, a right brake band 19, a left connecting rod 13, a right connecting rod 17, a pneumatic adjustment cylinder 15, a first hinge pin 12, a second hinge pin 14, a third hinge pin 16 and a fourth hinge pin 18. The left brake band 11 is hinged to one end of the left connecting rod 13 through the first hinge pin 12, the right brake band 19 is hinged to one end of the right connecting rod 17 through the fourth hinge pin 18, the pneumatic adjustment cylinder 15 is hinged to the other end of the left connecting rod 13 through the second hinge pin 14, and the pneumatic adjustment cylinder 15 is hinged to the other end of the right connecting rod 17 through the third hinge pin 16. The two ends are hinged, the middle parts of the left connecting rod 13 and the middle parts of the right connecting rod 17 are hingedly installed on the brake band fixing column 7, the left brake band 11 and the right brake band 19 are surrounded by the outer circle of the brake disc 2, and the pneumatic adjusting cylinder 15 extends when air is taken in, and drives the left brake band 11 and the right brake band 19 to hold the brake disc 2 through the left connecting rod 13 and the right connecting rod 17, thereby braking the brake disc 2; when the pneumatic adjusting cylinder 15 stops supplying air, the spring in the pneumatic adjusting cylinder 15 shortens the pneumatic adjusting cylinder 15, and drives the left brake band 11 and the right brake band 19 to release the brake disc 2 through the left connecting rod 13 and the right connecting rod 17.

[0020] When the power tongs are about to make up, the lifting cylinder 23 contracts to lower the rotary cylinder 31, and then the top of the reset sleeve 33 is embedded in the groove body at the bottom of the slotted sleeve 32 to form an engagement, and the rotary cylinder 31 rotates to put the reset sleeve 33 in the make-up position, and then the lifting cylinder 23 rises to make the rotary cylinder 31 rise again along with the lifting slide frame 22, making room for the floating body 4 and the brake disc 2 to rotate. Then the pneumatic regulating cylinder 15 supplies air, and the piston rod in the regulating cylinder 15 extends to drive the left connecting rod 13 and the right connecting rod 17 to make the left brake band 11 and the right brake band 19 hold the brake disc 2. At this time, the floating body 4 rotates clockwise, and the brake disc 2 is braked by the left brake band 11 and the right brake band 19. The floating body 4 is staggered with the brake disc 2, and the jaws climb. After clamping the drill pipe, the pneumatic regulating cylinder 15 stops supplying air, and the left brake band 11 and the right brake band 19 are loosened, so that the floating body 4 drives the brake disc 2 to rotate clockwise together. At this time, the left brake band 11 and the right brake band 19 are disengaged from the brake disc 2, and the brake bands are not worn. When the power tongs buckle action is completed, the brake disc 2 and the opening of the floating body 4 are misaligned, the pneumatic adjustment cylinder 15 is re-aired, the brake disc 2 is braked, and the floating body 4 rotates counterclockwise in the opposite direction. The reset pin 34 on the floating body 4 hits the semicircular missing edge of the reset sleeve 33 and drives the brake disc 2 to rotate counterclockwise together. At this time, the floating body 4 is aligned with the opening of the brake disc 2, and the caliper head is reset.

[0021] When preparing to shackle during the power tongs shattering operation, the lifting cylinder 23 contracts to lower the rotary cylinder 31, and then the top of the reset swivel sleeve 33 is embedded in the groove body at the bottom of the slotted swivel sleeve 32 to form an engagement, and the rotary cylinder 31 rotates 180° to put the reset swivel sleeve 32 in the shattering position, and then the lifting cylinder 23 extends to make the rotary cylinder 31 rise again along with the lifting slide frame 22, making room for the floating body 4 and the brake disc 2 to rotate. Then the pneumatic regulating cylinder 15 supplies air, and the piston rod in the regulating cylinder 15 extends to drive the left connecting rod 13 and the right connecting rod 17 to make the left brake band 11 and the right brake band 19 hold the brake disc 2. At this time, the floating body 4 rotates counterclockwise, and the brake disc 2 is braked by the left brake band 11 and the right brake band 19. The floating body 4 is staggered with the brake disc 2, and the jaws climb. After clamping the drill pipe, the pneumatic regulating cylinder 15 stops supplying air, and the left brake band 11 and the right brake band 19 are loosened, so that the floating body 4 drives the brake disc 2 to rotate together. At this time, the left brake band 11 and the right brake band 19 are disengaged from the brake disc 2, and the brake bands are not worn. When the power tongs unclamping action is completed, the brake disc 2 and the opening of the floating body 4 are misaligned, the pneumatic adjustment cylinder 15 is re-aired, the brake disc 2 is braked, and the floating body 4 rotates clockwise in the opposite direction. The reset pin 34 on the floating body 4 hits the semicircular missing edge of the reset rotating sleeve 33 and drives the brake disc 2 to rotate clockwise together. At this time, the floating body 4 is aligned with the opening of the brake disc 2, and the pliers head is reset.

[0022] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several similar modifications and improvements without departing from the creative concept of the present invention, and these should also be considered to be within the scope of protection of the present invention.

Claims

1. A clamp head reset mechanism for an open-end power tongs, characterized in that: The invention comprises a rotary mechanism (5), a lifting mechanism (6) and a brake mechanism (3), wherein the lifting mechanism (6) is mounted on the clamp body of the power tongs, the lifting mechanism (6), the brake disc (2) and the floating body (4) on the power tongs are all connected to the rotary mechanism (5), and the brake disc (2) and the brake band fixing column (7) on the power tongs are all connected to the brake mechanism (3); The lifting mechanism (6) includes a lifting slide frame (22), a lifting cylinder (23) and a guide bracket (24), wherein the guide bracket (24) is fixedly mounted on the tongs body of the power tongs, a sliding groove is provided on the guide bracket (24), and the bottom of the lifting slide frame (22) is embedded in the sliding groove, the lifting slide frame (22) and the guide bracket (24) are both connected to the lifting cylinder (23), and the rotary mechanism (5) is connected to the lifting slide frame (22); The rotary mechanism (5) includes a rotary cylinder (31), a slotted rotary sleeve (32), a reset rotary sleeve (33) and a reset pin (34). The rotary cylinder (31) is fixed on the lifting slide frame (22). The slotted rotary sleeve (32) is fixed on the shaft end of the rotary cylinder (31). The bottom of the slotted rotary sleeve (32) is provided with a groove body with an opening facing downward corresponding to the reset rotary sleeve (33). The reset rotary sleeve (33) is movably mounted on the fixed brake disc (2). The reset pin (34) is fixed on the floating body (4). The upper end of the reset pin (34) is embedded in the missing edge sleeve at the lower part of the reset rotary sleeve (33). The lifting cylinder (23) connects the lifting slide frame (22) and the guide bracket (24) together through an upper hinge pin (21) and a lower hinge pin (25). The lifting slide frame (22) moves up and down along the sliding groove under the action of the lifting cylinder (23).

2. The clamp head resetting mechanism of the open-end power tongs according to claim 1, characterized in that: The edge-missing sleeve is semicircular.

3. The clamp head resetting mechanism of the open-end power tongs according to claim 1, characterized in that: The brake mechanism (3) comprises a left brake band (11), a right brake band (19), a left connecting rod (13), a right connecting rod (17) and a pneumatic adjustment cylinder (15); the left brake band (11) and the right brake band (19) are respectively connected to one end of the left connecting rod (13) and one end of the right connecting rod (17); the other end of the left connecting rod (13) and the other end of the right connecting rod (17) are both connected to the pneumatic adjustment cylinder (15); the middle part of the left connecting rod (13) and the middle part of the right connecting rod (17) are mounted on the brake band fixing column (7); the left brake band (11) and the right brake band (19) are surrounded on the outer circle of the brake disc (2).

4. The clamp head resetting mechanism of the open-end power tongs according to claim 3, characterized in that: The brake mechanism (3) further comprises a first hinge pin (12), a second hinge pin (14), a third hinge pin (16) and a fourth hinge pin (18); the left brake band (11) is hinged to the left connecting rod (13) via the first hinge pin (12); the right brake band (19) is hinged to the right connecting rod (17) via the fourth hinge pin (18); the pneumatic adjustment cylinder (15) is hinged to the left connecting rod (13) via the second hinge pin (14); and the pneumatic adjustment cylinder (15) is hinged to the right connecting rod (17) via the third hinge pin (16).

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