CN215148747U - Labor-saving device for dismounting and mounting balance block fixing nut of pumping unit - Google Patents

Abstract

The utility model discloses a labor-saving device for assembling and disassembling a fixed nut of a balance block of a pumping unit, which comprises a worm gear transmission mechanism, wherein the worm gear transmission mechanism comprises a worm wheel and a worm which are meshed with each other; an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel; one shaft end of the worm is provided with a wrench used for engaging with a rotary driving mechanism. The screw driver also comprises a righting washer, wherein the inner diameter of the righting washer is larger than the outer diameter of the dismounted screw, and the inner diameter of the righting washer is smaller than the outer diameter of the worm wheel. The utility model discloses can be safe, efficient dismouting beam-pumping unit balancing piece fixation nut, reach the balanced purpose of convenient, swift adjustment beam-pumping unit, make the beam-pumping unit move under reasonable working condition.

Description

Labor-saving device for dismounting and mounting balance block fixing nut of pumping unit

Technical Field

The utility model belongs to the technical field of beam-pumping unit among the oil field mechanical oil recovery technique and specifically relates to a laborsaving device of beam-pumping unit balancing piece fixation nut dismouting.

Background

Balance adjustment of a beam pumping unit is a frequent task in oil well management. At present, the most common method for balancing a beam pumping unit in a production field is to stop a well firstly and then clean a track groove for moving a balancing block in a crank surface; calculating and measuring the distance of the balance block to be moved according to the uplink and downlink currents of the beam pumping unit and a balance weight adjusting calculation method, loosening a balance block locking screw and a balance block fixing screw by using a spanner and a sledge hammer, moving the balance block to a preset position by using a crow bar, finally installing the balance block locking screw, correcting the balance block, tightening the fixing screw and the locking screw, and starting the pumping unit.

The traditional field adjustment mode has the problems of long working time, high labor intensity and high risk, particularly, when a sledge hammer and a wrench are used for disassembling and fastening screws, the lifting type hydraulic lifting device needs to stand on a crank of the oil pumping unit, belongs to high-altitude operation, is easy to slip, fall and hurt even if a safety belt is fastened, has higher risk and has low safety coefficient of operation. The operation time of the balance adjustment can reach 2 to 3 hours on average, the operation time is long, the workload is large, and the operation rate and the crude oil yield of an oil well are seriously influenced.

There is a special hydraulic means of beam-pumping unit balancing piece fixing bolt loading and unloading at present, application number: 200520124605.8, composed of a hydraulic system and a ratchet wrench, the ratchet wrench and a wrench shell are divided into two bodies, and are connected into a right-angle three-shaped structure by a movable pin, the wrench shell is rectangular, wherein the upper part is provided with a wrench handle movable cavity, the lower part of the wrench movable cavity is provided with a plunger hydraulic cylinder, the top of the left side of the hydraulic cylinder is provided with an inward horizontal fixed shaft, the left side of the hydraulic cylinder is provided with a convex groove, two sides of the groove are provided with inward two movable pin holes, the periphery of the upper part and the periphery of the lower part of the hydraulic cylinder are respectively provided with a hydraulic communication hole which is respectively connected with a two-position four-way manual reversing valve; the ratchet wrench shell is triangular, the lower corner of the ratchet wrench shell is inserted into a groove on the left side of the hydraulic cylinder and connected by a movable pin, the upper corner of the ratchet wrench shell is inserted into an open slot arranged on the upper part of the ratchet wrench shell and is connected by a bayonet, one end of a wrench handle is inserted into a clamping slot arranged on the upper part of the piston rod, an arc slot arranged in the middle of the wrench handle is pressed on a fixed shaft, and the other end of the wrench handle is connected with the ratchet wrench; the inlet of the two-position four-way manual reversing valve is connected with the outlet of the hand-pressed hydraulic pump. The device needs a hydraulic pump and a high-pressure oil pipe, and has the advantages of complex manufacturing process, high manufacturing cost, easy failure and high maintenance cost. The hydraulic system has high oil pressure, and hydraulic oil is easy to leak through seals or gaps, so that hydraulic medium is consumed, and environmental pollution is caused. The field is not easy to carry, more than two persons are needed for operation, and the labor cost is high.

In addition, there are several balance adjusting devices of beam-pumping unit:

application No.: 201821761227.8A spanner for preventing balance weight from falling off is composed of a spanner with hexagonal holes, reinforcing arc slots at each corner of hexagonal holes, a circular through hole at tail of spanner, a centering tube concentric with the external circle of hexagonal holes, a balance weight fixing nut, a ring slot outside the lower part of centering tube, a pull ring consisting of two rings, and an elastic ring in the ring slot of lower part of centering tube for preventing the pull ring from falling off. The utility model discloses effectively prevent the spanner when beam-pumping unit balance adjustment and deviate from the nut, also can avoid the spanner to fall when deviating from to avoid injury ground operating personnel, guarantee oil field safety in production alleviates worker intensity of labour.

The following drawbacks still exist: the operation mode that the hammer is used for hammering the wrench to disassemble and fasten the nut is not changed, and an operator is limited by the space position during high-altitude operation, so that the risk of swinging the hammer to the air injury person and falling injury of the operator exists. The elastic rope needs to surround the whole balance block device, and the installation is inconvenient. The elasticity easily causes the spanner to incline and places, makes and receives the hammering atress untimely can skid and deviate from fixed nut. The labor intensity of operators is high, the danger is high, the safety coefficient is low, the operation time is long, and the crude oil yield of the operation rate of an oil well is influenced.

Application No.: 201621260500.X, an anti-drop wrench for a pumping unit counterbalance, comprising a handle and a wrench head disposed at the front end of the handle, wherein a through hole is disposed in the middle of the wrench head, and at least one shaft hole communicated with the through hole is disposed on the sidewall of the wrench head; the anti-drop spanner also comprises at least one fastener, and each fastener is inserted into and fixed in one shaft hole and is used for abutting against the side wall of the bolt head of the bolt to be screwed. The utility model discloses a set up at least one shaft hole on the outer wall of spanner head to use at least one fastener to insert and fix in the shaft hole, make the fastener offset with the bolt head lateral wall of treating the twist bolt, treat the twist bolt and unscrew or screw up, in order to adjust the balancing piece, be in balanced state until the beam-pumping unit.

The following drawbacks still exist: the operation mode that the hammer is used for hammering the wrench to disassemble and fasten the nut is not changed, and an operator is limited by the space position during high-altitude operation, so that the risk of swinging the hammer to the air injury person and falling injury of the operator exists. The spanner relies on spanner fixing bolt to push up nut lateral wall fastener anticreep, also can skid when the atress is improper and fly out and hinder the people, and the shaft hole of spanner has reduced the intensity of spanner. The spanner installation is loaded down with trivial details, and adjustment mounted position all needs dismouting fixing bolt and fastener at every turn, and operating personnel intensity of labour is big, operating time is long.

Application No.: 201520405442.4, the tight device that unloads of beam-pumping unit balancing piece fixing bolt includes: supporting, knocking and lifting tools; the method is characterized in that: the support of the beam-pumping unit balance block fixing bolt fastening device is of an inverted L-shaped structure, and a base plate is sleeved in the middle of the support; the knocking tool is of a cylindrical structure, the middle parts of the rods are connected through a coupling, and the upper parts of the rods are provided with knocking heads which are fixed through nuts; the middle of the rod body of the lifting tool is also connected by a coupling, one end of the lifting tool is provided with a lifting support head, and the other end of the lifting tool is provided with a lifting wrench head. The utility model discloses a be applicable to beam-pumping unit crank balance adjustment work, become flexible or fasten balancing piece fixing bolt on ground, prevent injury or the occurence of failure that falls, guarantee operating personnel's personal safety guarantees oil field safety in production.

The following drawbacks still exist: three devices, namely a supporting device, a knocking device and a lifting device, are required to be matched for use, the structure is complex, and faults are easy to occur. The installation workload is large, the operation technical requirement is high, the steps are complicated, workers are difficult to master, and the popularization is inconvenient. The operation on the ground is limited by the guardrail of the pumping unit, and the proper operation position is not available. The force arm of the knocking tool is too long, and the stability is poor. The striking head adopts a rod body design, and the striking force is insufficient. The device has long operation time, high labor intensity and low safety factor.

Application No.: 201320853576.3, beam-pumping unit balancing piece fixation nut spanner, including the location axle, the regulating spindle, nut spanner inside has interior polygon hole, install the location axle in nut spanner's one side, the location axle is in the outside in polygon hole, the lower part and the regulating spindle threaded connection of location axle, the location axle, two of regulating spindle symmetry installation, when nut spanner entangles lock nut, the regulating spindle supports on coupling nut, make the inside interior polygon hole of nut spanner can not block on coupling nut, therefore, lock nut can be dismantled earlier to nut spanner, coupling nut is dismantled to the back, the location axle, the regulating spindle can be installed on current spanner, need not reprocess the spanner, can reduce the processing cost.

The following drawbacks still exist: the operation mode that the hammer is used for hammering the wrench to disassemble and fasten the nut is not changed, and an operator is limited by the space position during high-altitude operation, so that the risk of swinging the hammer to the air injury person and falling injury of the operator exists. The spanner is supported by the positioning shaft and the adjusting shaft to keep the horizontal position to be prevented from falling off, the plane support of the two points is not a stable support surface, the spanner is not easy to keep the horizontal position, and the spanner can slip and fly out to hurt people when the spanner is stressed improperly.

Application No.: 201220659192.3 beam-pumping unit balancing piece bolt extracting tool, including the nut, the beam-pumping unit balancing piece, the beam-pumping unit crank, the nut is two overlapping installations, the nut is fixed the beam-pumping unit balancing piece on the beam-pumping unit crank, there is the polygon recess spanner tip below, the limit number of polygon recess is the same with the limit number of nut, the polygon recess is detained on the nut, the fixed sheath of polygon recess department of spanner, the second nut in two nuts is lived to the sheath, when dismantling installation beam-pumping unit balancing piece connecting bolt's nut, the nut can be detained to the recess of spanner, the sheath makes the utility model discloses the suit can not drop on the nut, the operation workman is dangerous when the dismouting bolt, can not cause the bodily injury accident, has apparent social.

The following drawbacks still exist: the operation mode that the hammer is used for hammering the wrench to disassemble and fasten the nut is not changed, and an operator is limited by the space position during high-altitude operation, so that the risk of swinging the hammer to the air injury person and falling injury of the operator exists. The fixed sheath has small supporting area and rough and uneven contact surface, and the wrench is only kept horizontal by gravity and placed in the nut, is not easy to keep horizontal, and slips and flies out to hurt people when the hammering stress is not correct. The labor intensity of operators is high, the danger is high, the safety coefficient is low, the operation time is long, and the crude oil yield of the operation rate of an oil well is influenced.

Application No.: 200720028112.3, a fixed screw dismounting tool of a balance block of a beam-pumping unit, the technical scheme is: the screw assembling and disassembling tool mainly comprises a sleeve and a handle, wherein the sleeve is used for assembling and disassembling screws, a supporting sleeve is additionally arranged on the lower side of the sleeve and is connected into a whole, and the inner diameter of the supporting sleeve is larger than the outer diameter of the screws. The beneficial effects are that: when this instrument had not only solved the dismouting and had been equipped with the cap, the problem on the nut of below was slided to the sleeve, had adjusted the instrument focus moreover, made the spanner more stable at work, and the atress is more abundant, did not need other people to hold up the spanner in operation process, had reduced the number of operations, had strengthened the factor of safety of operation.

The following drawbacks still exist: the operation mode that the hammer is used for hammering the wrench to disassemble and fasten the nut is not changed, and an operator is limited by the space position during high-altitude operation, so that the risk of swinging the hammer to the air injury person and falling injury of the operator exists. The supporting area of the additional supporting sleeve on the lower side of the sleeve is small, the contact surface is rough and uneven, the wrench is horizontally placed only by means of gravity and is sleeved in the nut, the wrench is not easy to keep horizontal, and the wrench can slip and fly out to hurt people when the wrench is stressed improperly.

The balance-adjusting nut tightening and dismounting device of the prior beam-pumping unit has various devices, but has the defects of overhigh manufacturing cost, complex structure, easy failure, poor safety in a hammering wrench mode adopted for high-altitude operation and the like generally, and still needs to be improved.

In a word, above technical scheme of the disclosed technology and the technical problem that will solve and the beneficial effect who produces all with the utility model discloses inequality, to the utility model discloses more technical problem and the beneficial effect that will solve, above open technical document all does not have the technological inspiration.

SUMMERY OF THE UTILITY MODEL

The above-mentioned defect to prior art existence, the utility model aims at providing a laborsaving device of beam-pumping unit balancing piece fixation nut dismouting, can be safe, efficient dismouting beam-pumping unit balancing piece fixation nut, reach convenient, the balanced purpose of swift adjustment beam-pumping unit, make the beam-pumping unit move under reasonable working condition.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the labor-saving device for dismounting the balance block fixing nut of the pumping unit comprises a worm gear and worm transmission mechanism, wherein the worm gear and worm transmission mechanism comprises a worm gear and a worm which are meshed together;

an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel;

one shaft end of the worm is provided with a wrench used for engaging with a rotary driving mechanism.

Furthermore, the screw driver also comprises a righting washer, wherein the inner diameter of the righting washer is larger than the outer diameter of the dismounted screw, and the inner diameter of the righting washer is smaller than the outer diameter of the worm wheel.

Further, the rotary drive mechanism is a ratchet wrench.

Furthermore, the positions of the worm close to the two shaft ends of the worm are provided with mutually symmetrical limiting tables.

The worm and the worm wheel are assembled in the shell, the shell is provided with a through hole, the axis of the through hole is consistent with the axis of the inner hexagonal sleeve structure in the center of the worm wheel, and meanwhile, the shell is provided with a side through hole used for exposing the wrench.

Furthermore, the shell is formed by buckling an upper shell and a lower shell, the upper shell and the lower shell are simultaneously provided with an inner cavity for accommodating the worm and gear transmission mechanism, and the contour shape of the inner wall of the inner cavity is consistent with the contour shape of the worm and gear.

Further, still include the reverse arm of force, the reverse arm of force includes the reverse arm of force of last casing and the reverse arm of force of casing down that mutual symmetry set up from top to bottom, the reverse arm of force is located the other side position relative with the side through-hole in the position of casing, goes up the reverse arm of force of casing and passes through connecting bolt interconnect fastening down with the reverse arm of force of casing down, forms firm bearing structure.

Further, the inner hexagonal sleeve structure comprises a cylindrical boss, a hexagonal through hole and a circumferential thrust surface;

the center of the worm wheel is provided with a cylindrical boss, the center of the boss is provided with a hexagonal through hole, and the periphery of the bottom of the boss is a circumferential bearing surface.

Compared with the prior art, the utility model following beneficial effect has:

the utility model discloses a spanner on the rotatory worm of ratchet spanner just can unload pine balancing piece fixation nut. The worm and worm gear transmission device is a labor-saving mechanism with high transmission ratio, so that the balance block fixing nut is labor-saving, safe and quick to disassemble, the labor intensity of operators is reduced, the operation danger is reduced, and the working efficiency is improved. And the structure is reasonable, the principle is reliable, the processing difficulty is small, the cost is low, and the economic benefit and the social benefit are obvious.

Drawings

FIG. 1 is a schematic structural view of a labor-saving device for assembling and disassembling a balance block fixing nut of an oil pumping unit of the present invention;

FIG. 2 is a front view of a righting washer of the labor-saving device for dismounting a balance block fixing nut of an oil pumping unit of the present invention;

FIG. 3 is a left side sectional view of FIG. 2;

fig. 4 is a schematic structural view of a worm and worm gear transmission mechanism of the labor saving device for dismounting and mounting the balance block fixing nut of the pumping unit of the present invention;

FIG. 5 is a side sectional view of FIG. 4;

FIG. 6 is a front view of the upper housing of the labor-saving device for assembling and disassembling the balance weight fixing nut of the pumping unit of the present invention;

FIG. 7 is a left side view of FIG. 6;

FIG. 8 is a front view of the lower housing of the labor saving device for assembling and disassembling the balance weight fixing nut of the pumping unit of the present invention;

FIG. 9 is a left side view of FIG. 8;

fig. 10 is a schematic view of the labor-saving device for assembling and disassembling the balance weight fixing nut of the pumping unit according to the present invention.

In the figure: 1-worm, 2-worm wheel, 3, upper shell, 4-lower shell, 5-reverse force arm, 6-connecting bolt, 7-ratchet wrench, 8-righting washer, 9-crank, 10-balance block, 11-fixing nut, 12-locking nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

referring to fig. 1 to 10, the present invention provides a technical solution:

the labor-saving device for dismounting the balance block fixing nut of the pumping unit comprises a worm gear and worm transmission mechanism, wherein the worm gear and worm transmission mechanism comprises a worm wheel 2 and a worm 1 which are meshed with each other;

an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel;

one shaft end of the worm is provided with a wrench square 1.1 for engaging with a rotary driving mechanism.

The screw driver also comprises a righting washer 8, wherein the inner diameter of the righting washer is larger than the outer diameter of the dismounted screw, and the inner diameter of the righting washer is smaller than the outer diameter of the worm wheel.

The rotary drive mechanism is a ratchet wrench 7.

And the positions of the worm close to the two shaft ends of the worm are provided with mutually symmetrical limiting tables 1.2.

The worm and the worm wheel are assembled in the shell, the shell is provided with a through hole, the axis of the through hole is consistent with the axis of the inner hexagonal sleeve structure at the center of the worm wheel, and meanwhile, the shell is provided with a side through hole used for exposing the wrench.

The shell is formed by buckling an upper shell 3 and a lower shell 4, the upper shell and the lower shell are simultaneously provided with an inner cavity for accommodating the worm and gear transmission mechanism, and the contour shape of the inner wall of the inner cavity is consistent with the contour shape of the worm and gear.

The reverse force arm comprises an upper shell reverse force arm and a lower shell reverse force arm which are symmetrically arranged from top to bottom, the reverse force arm is located at the other side opposite to the side through hole at the position of the shell, and the upper shell reverse force arm and the lower shell reverse force arm are fastened through the connecting bolts 6 in an interconnected mode to form a firm bearing structure.

The worm and worm gear transmission mechanism is arranged in the upper shell and the lower shell, proper amount of lubricating oil is smeared in the shells, and the shells form a whole through connecting bolts. The number of the worm heads is 1, the number of the worm gear teeth is 40, right-handed cylindrical worm is adopted for transmission, and the transmission ratio is 40. The center of the worm wheel is a cylindrical boss, the top surface of the boss is exposed at the two sides of the upper shell and the lower shell and is matched with the round holes at the centers of the upper shell and the lower shell to form a central shaft for the rotation of the worm wheel. The boss central structure is a hexagonal through hole, and the size of the boss central structure is matched with the model of the balance block fixing nut. The boss sleeve rotates on the balance block fixing nut and can drive the balance block fixing nut to rotate. The worm is meshed with the worm wheel and is limited to rotate in the shell through shoulders at two ends. One end of the worm wheel exposed shell is provided with a wrench square with a square cross section, and the wrench square is matched with a ratchet wrench to realize the rotation of the screw. The center of the upper shell and the center of the lower shell are provided with circular through holes, the surface of the upper shell is provided with cylindrical counter bores for installing connecting bolts, and the surface of the lower shell is provided with threaded holes for installing the connecting bolts. One end of the shell is provided with a reverse force arm in the direction opposite to the wrench. The shape of the righting washer is a square and semicircular combination body, and except for one end of the righting washer, the other parts are all of solid structures.

The worm 1 is engaged with the worm wheel 2, is arranged between the upper shell 3 and the lower shell 4, and realizes sealing and fastening through a connecting bolt 6. The ratchet wrench 7 is sleeved in the wrench square 1.1 to drive the worm 1 to rotate clockwise or anticlockwise and transmit the rotation to the worm wheel 2 to rotate clockwise or anticlockwise.

The worm 1 is right-handed worm transmission, and both ends unanimous distance is provided with spacing platform 1.2, and the end of one end is provided with the spanner side 1.1 that supplies to take the spanner.

The center of the worm wheel 2 is provided with a cylindrical boss 2.1, the central structure of the boss 2.1 is a hexagonal through hole 2.2, and the periphery of the bottom of the boss 2.1 is a circumferential bearing surface 2.3.

The surface of the upper shell 3 is provided with a cylindrical counter bore 3.1 for mounting a connecting bolt, and the center is provided with a circular through hole 3.2.

The surface of the lower shell 4 is provided with a threaded hole 4.1 for mounting a connecting bolt, and the center of the lower shell is provided with a circular through hole 4.2.

The reverse force arm 5 is respectively arranged at one side of the upper shell 3 and one side of the lower shell 4 and forms a firm bearing structure after being fastened by the connecting bolt 6.

The connecting bolt 6 is an inner hexagonal common coarse thread outer thread.

The ratchet wrench 7 is a square socket ratchet wrench with an anti-slip handle.

The shape of the righting washer 8 is a combination of a rectangle and a semicircle, the thickness is 40mm, and except that one end is provided with a circular through hole, the rest is a solid structure.

When the balance weight 10 is used, the crank 9 of the oil pumping unit is stopped at a position horizontally inclined by 5 degrees according to the adjustment requirement, and the balance weight 10 is correspondingly stopped at a position horizontally inclined by 5 degrees.

Disassembling the balance block locking nut 12 and the fixing nut 11: the righting washer 8 is sleeved into a balance block fixing nut 11 at a low part, the hexagonal through hole 2.2 of the labor-saving wrench is sleeved into a balance block locking nut 12, and the reverse force arm 5 is abutted against the side face of a balance block 10. Ratchet spanner 7 packs into in 1.1 of worm 1 exerted spanner side, makes 1 anticlockwise rotations of worm, and 2 anticlockwise rotations of worm wheel drive balancing piece lock nut 12 anticlockwise rotations and unload the pine back, and 7 clockwise rotations of ratchet spanner take off the utility model discloses laborsaving device takes off and rights packing ring 8. And sleeving the labor-saving wrench on the balance block fixing nut 11 again, repeating the operation, and loosening the balance block fixing nut 11. After the locking nut 12 and the fixing nut 11 at the other side of the balance weight 10 are loosened in the same manner, the balance weight 10 is moved to a predetermined position.

Tightening the balance weight fixing nut 11 and the locking nut 12: the hexagonal through hole 2.2 of the labor-saving wrench is sleeved into the high balance block fixing nut 11, and the reverse force arm 5 is abutted to the side face of the balance block 10. Ratchet spanner 7 clockwise rotation, worm wheel 2 drive balancing piece lock nut 12 clockwise rotation dress tightly back, with ratchet spanner 7 anticlockwise rotation, take off the utility model discloses laborsaving device will right the packing ring 8 and embolia high position balancing piece lock nut 11 on, embolia balancing piece lock nut 12 again with laborsaving spanner on, operation more than repeated, adorns balancing piece lock nut 12 tightly. And (3) loosening and tightening the fixing nut 11 and the locking nut 12 at the lower part of the other side of the balance weight 10 by the same method, and finishing the operation.

Example 2:

referring to fig. 1 to 10, the present invention provides a technical solution:

the labor-saving device for dismounting the balance block fixing nut of the pumping unit comprises a worm gear and worm transmission mechanism, wherein the worm gear and worm transmission mechanism comprises a worm wheel 2 and a worm 1 which are meshed with each other;

an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel;

one shaft end of the worm is provided with a wrench square 1.1 for engaging with a rotary driving mechanism.

The screw driver also comprises a righting washer 8, wherein the inner diameter of the righting washer is larger than the outer diameter of the dismounted screw, and the inner diameter of the righting washer is smaller than the outer diameter of the worm wheel.

The rotary drive mechanism is a ratchet wrench 7.

And the positions of the worm close to the two shaft ends of the worm are provided with mutually symmetrical limiting tables 1.2.

The worm and the worm wheel are assembled in the shell, the shell is provided with a through hole, the axis of the through hole is consistent with the axis of the inner hexagonal sleeve structure at the center of the worm wheel, and meanwhile, the shell is provided with a side through hole used for exposing the wrench.

Example 3:

referring to fig. 1 to 10, the present invention provides a technical solution:

the labor-saving device for dismounting the balance block fixing nut of the pumping unit comprises a worm gear and worm transmission mechanism, wherein the worm gear and worm transmission mechanism comprises a worm wheel 2 and a worm 1 which are meshed with each other;

an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel;

one shaft end of the worm is provided with a wrench square 1.1 for engaging with a rotary driving mechanism.

The screw driver also comprises a righting washer 8, wherein the inner diameter of the righting washer is larger than the outer diameter of the dismounted screw, and the inner diameter of the righting washer is smaller than the outer diameter of the worm wheel.

Although fig. 1 to 10 are used in all the above embodiments, it is obvious to those skilled in the art that separate drawings are not shown as long as the parts or structural features missing in the embodiments are removed from the drawings. As will be clear to the skilled person. Of course, the more parts or structural features of the embodiments are the most preferred embodiments, and the less parts of the embodiments are the basic embodiments, but the basic objects of the present invention can be achieved, so that all these modified embodiments are within the scope of the present invention.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The labor-saving device for dismounting the balance block fixing nut of the pumping unit is characterized by comprising a worm gear and worm transmission mechanism, wherein the worm gear and worm transmission mechanism comprises a worm gear and a worm which are meshed with each other;

an inner hexagonal sleeve structure matched with the disassembled and assembled screw is arranged in the center of the worm wheel;

one shaft end of the worm is provided with a wrench used for engaging with a rotary driving mechanism.

2. The labor-saving device for disassembling and assembling the balance block fixing nut of the pumping unit according to claim 1, further comprising a centering washer, wherein the inner diameter of the centering washer is larger than the outer diameter of the disassembled screw, and the inner diameter of the centering washer is smaller than the outer diameter of the worm wheel.

3. The device of claim 1 or 2, wherein the rotary drive mechanism is a ratchet wrench.

4. The labor-saving device for dismounting the balance block fixing nut of the pumping unit according to claim 1 or 2, wherein the positions of the worm close to the two shaft ends of the worm are provided with mutually symmetrical limiting tables.

5. The labor-saving device for dismounting the fixing nut of the balance block of the pumping unit according to claim 1 or 2, further comprising a shell, wherein the worm and the worm wheel are assembled in the shell, the shell is provided with a through hole, the axis of the through hole is consistent with the axis of the inner hexagonal sleeve structure at the center of the worm wheel, and meanwhile, the shell is provided with a side through hole for exposing a wrench.

6. The labor-saving device for dismounting the balance weight fixing nut of the pumping unit according to claim 5, wherein the housing is formed by buckling an upper housing and a lower housing, the upper housing and the lower housing are simultaneously provided with inner cavities for accommodating the worm and gear transmission mechanism, and the contour shape of the inner wall of each inner cavity is consistent with the contour shape of the worm and gear.

7. The labor-saving device for dismounting the fixing nut of the balance block of the pumping unit according to claim 6, further comprising a reverse force arm, wherein the reverse force arm comprises an upper shell reverse force arm and a lower shell reverse force arm which are arranged up and down symmetrically, the reverse force arm is located at the other side position opposite to the side through hole at the position of the shell, and the upper shell reverse force arm and the lower shell reverse force arm are connected and fastened with each other through a connecting bolt to form a firm bearing structure.

8. The labor-saving device for dismounting the balance block fixing nut of the pumping unit according to claim 1 or 2, wherein the inner hexagonal sleeve structure comprises a cylindrical boss, a hexagonal through hole and a circumferential bearing surface;

the center of the worm wheel is provided with a cylindrical boss, the center of the boss is provided with a hexagonal through hole, and the periphery of the bottom of the boss is a circumferential bearing surface.

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