CN217270079U - Double-door single-control safety protection device of open type hydraulic power tongs - Google Patents

Abstract

A double-door single-control safety protection device of an open type hydraulic power tong comprises a hydraulic motor, a power tong body, a left safety door, a right safety door, a push rod assembly, a swing plate assembly, a connecting cable assembly, a push-pull cable flexible shaft and a spring reset gate control valve, wherein the push rod assembly and the swing plate assembly are arranged on the inner side of the right safety door body; an upper oil inlet and an oil return port of a valve body of the spring reset gate control valve are communicated with a motor oil port of the hydraulic motor; the swing plate assembly is connected with the spring reset gate control valve through a connecting cable assembly and a push-pull cable flexible shaft. The utility model has the advantages that: the door control safety device of the opening power tongs with the double safety doors is simpler and more reliable, realizes the function of single control of the double doors, has more compact structure and obviously improves the safety performance.

Description

Double-door single-control safety protection device of open type hydraulic power tongs

Technical Field

The utility model relates to a safety device of power tong for oil drilling and workover, especially the two safety automatic safety arrangement who open type hydraulic power tong open the door belong to oil field mechanical safety protection technical field.

Background

Due to the safety requirement, the open type power tongs for the oilfield pipe are required to be provided with a safety protection device. The prior open type power tongs are improved for many times, have various safety protection forms, and have various safety protection structures for adapting to the power tongs with a large pipe diameter and adopting double safety doors. Like in chinese patent No. 201520561601.X is named as "an opening type hydraulic power pincers two door control safety arrangement" the utility model patent, disclose one: comprises a gate control valve, a push-pull cable flexible shaft, a bracket, a pin shaft, a left safety door, a right safety door, a power tong body and a hydraulic motor. The left safety door and the right safety door are arranged at the opening of the power tong body; the gate control valve consists of a gate control valve body and two gate control valve cores, and an oil port of the gate control valve is communicated with an oil inlet and an oil return port of the hydraulic motor; one end of a flexible shaft joint at the two ends of one push-pull cable is hinged to the left or right of the safety door through a pin shaft, and the other end of the flexible shaft joint is fixedly connected to the end part of a valve core of the gate control valve; one end of the hose joint at the two ends is fixed on the power tong body through a bracket, and the other end is fixed on the bracket; the bracket is fastened with the gate control valve body into a whole. The safety door protection structure has a good protection effect on the opening type hydraulic power tongs with double doors, but the safety door protection structure is controlled by adopting double flexible shafts and double doors, the number of the flexible shafts is two, and the flexible shafts are easy to collide when being used on site. If the chinese patent No. 200920007413.7 is named as "an open type hydraulic power tong emergency exit automatic safety protection device", a: a push rod type two-position three-way reversing valve is arranged on the safety door or the power tong body; a double-hydraulic control one-way valve is arranged between the manual reversing valve and the hydraulic motor; the opening or closing of the safety door controls the reversing of the ejector rod type two-position three-way reversing valve. The structure is a double-gate single-control structure, but in practical use, the following problems exist: 1. a double-hydraulic control one-way valve is arranged between the manual reversing valve and the hydraulic motor and is a stop valve which cuts off an oil way, and the hydraulic system is always in a pressure-holding state as long as the door is not closed; 2. the ejector rod type two-position three-way reversing valve is arranged on the safety door or the power tong body and is connected with the double-hydraulic control one-way valve through an oil pipe, and the pipeline is long and is easy to collide. Therefore, a double door of the open type power tong for the oilfield tubular requires a safety protection device with single control and a new structure.

Disclosure of Invention

To the not enough in the effective two emergency exit safety protection technologies of opening type power tong in current oil field, the utility model provides a two single-control safety arrangement of opening type hydraulic power tong.

The technical scheme of the utility model is that: a double-door single-control safety protection device of an open type hydraulic power tong comprises a hydraulic motor, a power tong body, a left safety door, a right safety door, a mandril assembly, a swinging plate assembly, a connecting cable assembly, a push-pull cable flexible shaft and a spring reset door control valve, wherein the left safety door and the right safety door are arranged at an opening of the power tong body, and the right safety door comprises a right safety door body and a door shaft; the power tong comprises a power tong body, a support is fixed on the power tong body, the push-pull cable flexible shaft comprises a flexible shaft head, a flexible pipe joint nut and a flexible shaft, the ejector rod assembly is arranged on the inner side of the right safety door body, and the ejector rod assembly comprises an ejector rod seat, an ejector rod spring and a stop pin; the ejector rod seat is fixed with the right safety door body, and the ejector rod is arranged in the ejector rod seat groove and can move back and forth; the stop pin penetrates through a slotted hole on the ejector rod and is arranged on the ejector rod seat; the ejector rod spring is arranged in the inner cavity of the ejector rod, one end of the ejector rod spring is propped against the inner cavity of the ejector rod, and the other end of the ejector rod spring is propped against the stop pin; the top of the ejector rod is propped against the side plate of the left safety door;

the swing plate assembly is arranged on the inner side of the right safety door body and can rotate around a door shaft, the swing plate assembly comprises a swing plate, a spring and a limit screw, and the side surface of the head of the swing plate can abut against the tail of the ejector rod; when the ejector rod retracts, the tail of the ejector rod pushes against the side face of the head of the swing plate, and the right safety door is closed to drive the swing plate assembly to rotate; one end of the spring abuts against the side face of the head of the swing plate, and the other end of the spring abuts against the side wall of the inner cavity of the right safety door body; the limiting screw is fixed on the swinging plate, and the head of the limiting screw is limited in the arc-shaped groove on the right safety door body; the swing plate assembly synchronously rotates along with the right safety door and can rotate in an angle limited by the arc-shaped groove on the right safety door body, the spring props against the swing plate to rotate inwards in a door opening state, the limiting screw on the swing plate rotates to the limiting position of the arc-shaped groove, at the moment, the swing plate and the right safety door body keep relative positions, the relative space of the swing plate and the right safety door body can accommodate the ejector rod to retract freely, and the ejector rod does not interfere with the swing plate;

the spring reset gate control valve comprises a clamp spring, a valve body, a valve core, a reset spring and a bracket, wherein an upper oil inlet and an oil return port of the valve body are communicated with a motor oil port of a hydraulic motor; the valve core is connected in series in the valve body, and the upper end and the lower end of the valve core are limited by clamp springs; the bracket is fastened and integrated with the valve body, and the return spring is arranged between the bracket and the valve core;

the connecting cable assembly comprises a pin shaft, a connector, a nut, a fork head and a soft cable, the connector at one end of the connecting cable assembly is connected with a connecting lug of the swinging plate through the pin shaft, and the fork head at the other end of the connecting cable assembly is connected with a soft shaft head at one end of the push-pull cable flexible shaft; the other end of the push-pull cable flexible shaft is connected with the valve core through a flexible shaft head; and a hose joint nut at one end of the push-pull cable flexible shaft is fixed on a support on the power tong body, and a hose joint nut at the other end is fixed on a bracket of the spring reset gate control valve.

The threads on the forks at the two ends of the connecting cable assembly are left-handed threads at one end and right-handed threads at the other end, the rotating direction of the connected connecting threads is consistent with that of the threads of the forks, and the forks at the two ends can be rotated to realize fine adjustment tightness during installation; after fine adjustment, the two ends are combined and tightened.

According to the structural requirement, the soft rope is a chain.

Optionally, according to the structural requirement, the soft cable is a steel wire.

Alternatively, the ejector assembly and the swing plate assembly may be installed at the side of the left safety door according to structural requirements.

The utility model has the advantages that: the door control safety device of the opening power tongs with the double safety doors is simpler and more reliable, realizes the function of single control of the double doors, has more compact structure and obviously improves the safety performance.

Drawings

Fig. 1 is a schematic top view of the present invention;

FIG. 2 is a cross-sectional view of the step A-A of FIG. 1;

FIG. 3 is a schematic top view (in cross-section) of the ram assembly;

FIG. 4 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a top schematic view of the swing plate assembly;

FIG. 6 is a schematic view of the attachment of the connective cord assembly (front view);

FIG. 7 is a schematic front view (in cross-section) of a spring-return gated valve;

fig. 8 is a schematic top view of the safety door in an opened state.

In fig. 1, 2, 3, 4, 5, 6, 7, 8: 1. a hydraulic motor; A. a motor oil port; B. a motor oil port; 2. a power tong body; 201. a support; 3. a left safety door; 4. a right safety door; 401. a right safety door body; 402. a door shaft; a. an arc-shaped slot; 5. a mandril assembly; 501. a jack rod seat; 502. a top rod; 503. a push rod spring; 504. a stop pin; b. a slot; 6. a swing plate assembly; 601. a swing plate; 602. a spring; 603. a limit screw; c. a head side; d. connecting lugs; 7. a connecting cable assembly; 701. a pin shaft; 702. a connector; 703. carrying out combination; 704. a fork head, 705 and a pin shaft; 706. soft cables; 707. jaw, 708, cross; 8. a push-pull cable flexible shaft; 801. a soft shaft head; 802. a hose nipple nut; 803. a flexible shaft; 804. a hose nipple nut; 805. a soft shaft head; 9. a spring-reset gate control valve; 901. a clamp spring; 902. a valve body; 903. a valve core; 904. a return spring; 905. a bracket; p, an oil inlet; o, an oil return port.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 1, 2, 3, 4, and 8, the left safety door 3 and the right safety door 4 are installed at an opening of the power tong body 2, and the right safety door 4 includes a right safety door body 401 and a door shaft 402; the power tong body 2 comprises a support 201, the support 201 is fixed on the power tong body 2, the push-pull cable flexible shaft 8 comprises flexible shaft heads 801 and 805, hose joint nuts 802 and 804 and a flexible shaft 803, the ejector rod assembly 5 is installed on the inner side of the right safety door body 401, and the ejector rod assembly 5 comprises an ejector rod seat 501, an ejector rod 502, an ejector rod spring 503 and a stop pin 504; the ejector rod seat 501 is fixed with the right safety door body 401, and the ejector rod 502 is arranged in a groove of the ejector rod seat 501 and can move back and forth; the stop pin 504 passes through a slotted hole b on the ejector rod 502 and is arranged on the ejector rod seat 501; the ejector rod spring 503 is arranged in the inner cavity of the ejector rod 502, one end of the ejector rod spring 503 is propped against the inner cavity of the ejector rod 502, and the other end of the ejector rod spring 503 is propped against the stop pin 504; the top of the top rod 502 is propped against the side plate of the left safety door 3;

as shown in fig. 1, 2, 5, and 8, the swing plate assembly 6 is mounted inside the right safety door body 401 and can rotate around the door shaft 402, the swing plate assembly 6 includes a swing plate 601, a spring 602, and a limit screw 603, and a side c of a head of the swing plate 601 can abut against a tail of the push rod 502; when the ejector rod 502 retracts, the tail part of the ejector rod 502 pushes against the head side surface c of the swing plate 601, and the right safety door 4 can drive the swing plate assembly 6 to rotate after being closed; one end of the spring 602 abuts against the side face c of the head of the swing plate 601, and the other end abuts against the side wall of the inner cavity of the right safety door body 401; the limit screw 603 is fixed on the swing plate 601, and the head of the limit screw 603 is limited in the arc-shaped groove a on the right safety door body 401; the swing plate assembly 6 rotates synchronously with the right safety door 4 and can also rotate within the angle limited by the arc-shaped groove a on the right safety door body 401. In the door opening state, the spring 602 abuts against the swing plate 601 to rotate inwards, the limiting screw 603 on the swing plate 601 rotates to the limiting position of the arc-shaped groove a, at the moment, the swing plate 601 and the right safety door body 401 keep relative positions, the relative space can accommodate the ejector rod 502 to freely retract, and the ejector rod 502 does not interfere with the swing plate 601;

as shown in fig. 1, 7 and 8, the spring return gate control valve 9 includes a snap spring 901, a valve body 902, a valve core 903, a return spring 904 and a bracket 905, and an upper oil inlet P and an oil return O of the valve body 902 are communicated with a motor oil inlet A, B of the hydraulic motor 1; the valve core 903 is connected in series in the valve body 902, and the upper end and the lower end of the valve core 903 are limited by clamp springs 901; the bracket 905 is fastened and integrated with the valve body 902, and the return spring 904 is arranged between the bracket 905 and the valve core 903;

as shown in fig. 1, 6, 7 and 8, the connecting cable assembly 7 comprises pin shafts 701 and 705, a connector 702, nuts 703 and 708, forks 704 and 707, and a flexible cable 706, the connector 702 at one end of the connecting cable assembly 7 is connected with the connecting lug d of the swinging plate 601 through the pin shaft 701, and the fork 707 at the other end of the connecting cable assembly 7 is connected with the flexible shaft head 801 at one end of the flexible shaft 8 of the push-pull cable; the soft shaft head 805 at the other end of the push-pull cable soft shaft 8 is connected with the valve core 903; and a hose joint nut 802 at one end of the push-pull cable flexible shaft 8 is fixed on the support 201 on the power tong body 2, and a hose joint nut 804 at the other end is fixed on a bracket 905 of the spring reset gate control valve 9.

As shown in fig. 6, one end of the screw thread on the two ends of the fork heads 704 and 707 of the connecting cable assembly 7 is a left-handed screw thread, the other end is a right-handed screw thread, the screw direction of the connecting screw thread connected with the left-handed screw thread is consistent with the screw direction of the fork heads 704 and 707, and when the connecting cable assembly is installed, the fork heads 704 and 707 at the two ends can be rotated to realize fine adjustment; after trimming, the two ends are brought together 703 and 708.

As shown in fig. 6, the flexible cable 706 is a chain according to the structural requirement.

As shown in fig. 6, the flexible cable 706 may be a steel wire according to the structural requirement.

As shown in fig. 1 and 8, the ram assembly 5 and the swing plate assembly 6 may be installed at the side of the left safety door 3, alternatively, according to the structural requirements.

When the left safety door 3 and the right safety door 4 are gradually closed, after the ejector rod 502 is pushed against the side plate on the left safety door 3, the ejector rod 502 retracts, the left safety door 3 and the right safety door 4 are continuously closed, the ejector rod 502 retracts continuously until the tail part of the ejector rod 502 abuts against the head side face c of the swinging plate 601, the right safety door 4 can drive the swinging plate assembly 6 to rotate after being continuously closed, and the connecting cable assembly 7 is still in a slack state; when the right safety door 4 is continuously closed, the swing plate assembly 6 is driven to continuously rotate, the connecting cable assembly 7 is in a tight state, the connecting cable assembly 7 drives the push-pull cable flexible shaft 8 to pull the valve core 903 to move downwards until the right safety door 4 is closed in place, the valve core 903 also moves downwards to be in place, at the moment, the upper oil inlet P and the oil return port O of the spring reset gate control valve 9 are not communicated, the hydraulic system is in a normal working state, the oil inlet P and the oil return port O are respectively communicated with the motor oil port A and the motor oil port B, and the power tongs can normally run;

when the left safety door 3 or the right safety door 4 is opened and is in a door opening state, the connecting cable assembly 7 is in a slack state, the return spring 904 pushes the valve core 903 to move upwards to a limited position, meanwhile, the ejector rod 502 extends out under the action of the ejector rod spring 503 and is separated from the swinging plate 601, and the swinging plate 601 is always kept in a relative position under the action of the spring 602; at the moment, an upper oil inlet P of the spring reset gate control valve 9 is communicated with an oil return port O, the hydraulic system is in an unloading state, the power tongs cannot operate, the safety protection effect is achieved, the safety door is closed, the power tongs normally work, the safety door is opened, and the power tongs cannot operate.

Claims (5)

1. A double-door single-control safety protection device of an open type hydraulic power tong comprises a hydraulic motor, a power tong body, a left safety door, a right safety door, a mandril assembly, a swinging plate assembly, a connecting cable assembly, a push-pull cable flexible shaft and a spring reset door control valve, wherein the left safety door and the right safety door are arranged at an opening of the power tong body, and the right safety door comprises a right safety door body and a door shaft; the power tong body contains the support, the support is fixed on the power tong body, the push-and-pull cable flexible axle contains soft spindle nose, hose nipple nut, flexible axle, its characterized in that:

the ejector rod assembly is arranged on the inner side of the right safety door body and comprises an ejector rod seat, an ejector rod spring and a stop pin; the ejector rod seat is fixed with the right safety door body, and the ejector rod is arranged in the ejector rod seat groove and can move back and forth; the stop pin penetrates through a slotted hole on the ejector rod and is arranged on the ejector rod seat; the ejector rod spring is arranged in the inner cavity of the ejector rod, one end of the ejector rod spring is propped against the inner cavity of the ejector rod, and the other end of the ejector rod spring is propped against the stop pin; the top of the ejector rod is propped against the side plate of the left safety door;

the swing plate assembly is arranged on the inner side of the right safety door body and can rotate around a door shaft, the swing plate assembly comprises a swing plate, a spring and a limit screw, and the side surface of the head of the swing plate can abut against the tail of the ejector rod; one end of the spring abuts against the side face of the head of the swing plate, and the other end of the spring abuts against the side wall of the inner cavity of the right safety door body; the limiting screw is fixed on the swinging plate, and the head of the limiting screw is limited in the arc-shaped groove on the right safety door body;

the spring reset gate control valve comprises a clamp spring, a valve body, a valve core, a reset spring and a bracket, wherein an upper oil inlet and an oil return inlet of the valve body are communicated with a motor oil port of a hydraulic motor; the valve core is connected in series in the valve body, and the upper end and the lower end of the valve core are limited by clamp springs; the bracket is fastened and integrated with the valve body, and the return spring is arranged between the bracket and the valve core;

the connecting cable assembly comprises a pin shaft, a connector, a nut, a fork head and a soft cable, wherein the connector at one end of the connecting cable assembly is connected with the connecting lug of the swinging plate through the pin shaft, and the fork head at the other end of the connecting cable assembly is connected with the soft shaft head at one end of the push-pull cable flexible shaft; the other end of the push-pull cable flexible shaft is connected with the valve core through a flexible shaft head; and a hose joint nut at one end of the push-pull cable flexible shaft is fixed on a support on the power tong body, and a hose joint nut at the other end is fixed on a bracket of the spring reset gate control valve.

2. The open type hydraulic power tong double-door single-control safety protection device as claimed in claim 1, characterized in that: and one end of the thread on the fork heads at the two ends of the connecting cable assembly is a left-handed thread, the other end of the thread is a right-handed thread, and the rotating direction of the connected connecting thread is consistent with that of the fork head thread.

3. The open type hydraulic power tong double-door single-control safety protection device as claimed in claim 1, characterized in that: according to the structural requirement, the soft rope is a chain.

4. The open type hydraulic power tong double-door single-control safety protection device as claimed in claim 1, further characterized in that: according to the structural requirement, the soft cable is a steel wire.

5. The open type hydraulic power tong double-door single-control safety protection device as claimed in claim 1, characterized in that: the top rod assembly and the swinging plate assembly can be arranged on the side of the left safety door according to the structural requirement.

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