CN202402012U - Indirect driving traction type pumping unit - Google Patents

Abstract

An indirect driving traction type pumping unit fundamentally solves problems that the existing traction type pumping unit is limited in traction force and application environment and the like. The indirect driving traction type pumping unit comprises a frame, a base, a hanging device and a traction device and is characterized in that an upper motor base and a lower motor base which fix a permanent magnet synchronous motor are respectively arranged on the frame and the base, a traction wheel of the traction device and a rotor on a driving spindle of the permanent magnet synchronous motor are assembled together, and an encoder is arranged on the end portion of the spindle of the permanent magnet synchronous motor. Drum-type brake arms are arranged on two sides of a braking wheel and connected with an electromagnetic band-type brake on the upper portion of the permanent magnet synchronous motor. A left traction steel wire rope and a right traction steel wire rope respectively wind on the same traction wheel in the same direction, one ends of the steel wire ropes respectively wind round a lower pulley group and are respectively fixed on the base, and the other ends of the steel wire ropes respectively wind round a guide wheel fixed on the frame and two lower pulley groups and are fixed on the frame. Compared with the like products, the indirect driving traction type pumping unit is reasonable in design and low in cost and has the advantages of being safe and reliable in operation, large in traction force, high in transmission efficiency and wide in application range.

Description

Indirect-drive towed formula oil pumper

Technical field

The utility model relates to a kind of traction type oil extractor, particularly a kind ofly both has been applicable to location or neritic province domain low-lying, frequent ponding, is applicable to that also wind is big, need often safeguard the indirect-drive towed formula oil pumper in location.Its alternative 20 type or above large-scale oily beam machine belong to oil field oil recovery machiner technical field.

Background technology

At present, the most oil pumpers that use in China oil field are beam pumping units, and it is relatively simple for structure, and is durable, and maintenance and operation are more convenient, but exist transmission efficiency low, big energy-consuming, defective such as consumptive material is many, and intelligent degree is low.In order to overcome above shortcoming, and respond the call of national energy-saving and emission-reduction, people more and more pay attention to traction type oil extractor, the counterweight traction type oil extractor be use many a kind of.Like notification number is CN100504068C " the flexible transmission oil pumping machine of pulley type ".It adopts flexible material that sucker rod and tandem-driving bogie are coupled together through cylinder, and sucker rod and liquid emphasis amount just are balanced case and balance a part like this, moves up and down through reel and the flexible band pulling tandem-driving bogie that is connected with motor more in addition.Like this, compare beam pumping unit, this traction type oil extractor has reduced the power of motor, has promoted transmission efficiency, and has reduced the use and the floor space of material.

To the defective that existing traction type oil extractor exists, the applicant belongs to company (Shenyang Languang Driving Technology Co., Ltd) and once designed " the gearless counterweight traction type oil extractor of provided with motor at lower " that a kind of notification number is CN101413386A.This machine has adopted the counterweight draw mode, through head sheave and movable pulley the hanging function and the traction function of oil pumper wire rope is separated.Like this, hanging steel rope only need satisfy hanging function, can design very slightly, and to increase application life and safety factor, traction steel-cable only need satisfy extra traction, can design very carefully, to reduce the diameter of traction sheave and pulley.This design has solved the rope service-life weak point of existing traction type oil extractor and the problem of poor stability basically.Yet it still exists unsatisfactory part.

In the design of traction type oil extractor, how to amplify the traction of motor with pulling counterweight and sucker rod is a difficult point.Above-mentioned notification number be CN101413386A's " the gearless counterweight traction type oil extractor of provided with motor at lower " adopted through the one-level reducer and amplified the traction that motor provides.Similar design also is embodied in CN100504068C and notification number is on " the long stroke towing oil-pumping machine " of CN201367885Y.Because the constant principle of reducer transmission torque, in order to increase the output traction, the diameter of traction sheave must reduce.Yet under the situation that traction steel-cable (or flexible being with) rope is directly fixed, the diameter that dwindles traction sheave can reduce the application life of wire rope (or flexible being with) undoubtedly greatly.Therefore, on it was used, reducer was limited to the multiplication factor of motor traction, and transmission efficiency can not guarantee.Continue to increase traction if desired, then must improve the moment of torsion of drive motors.But, no matter be to adopt switched reluctance machines, still adopt the permanent magnetism synchronization gear wheel free motor, its moment of torsion all is directly proportional with motor cost.Therefore, the type oil pumper can only provide limited traction under the prerequisite that guarantees cost, can't substitute 20 types or above large-scale oily beam machine.

Transmitting the motor traction to construction of wire rope, more than three kinds of patents the design of adopting belt pulley is all disclosed.This also is the widely mature technology of use of existing beam pumping unit institute.Yet because the principle that traction type oil extractor pumps, the belt that connects traction machine and reducer also can move back and forth, so its life-span can have decline significantly than mechanism's (like oily beam machine) of equidirectional rotation.Because of belt itself has elastic force, the frictional force between belt and the belt pulley can't accurately be controlled, so in motor commutation, be easy to skid.This has not only quickened the aging of belt, and this type of phenomenon that " throws switch " has also produced very big problem to the accurate control of motor range.And the phenomenon of belt creep carries protection for the mistake of oil pumper and detecting has proposed very hang-up, more than three kinds of all very imperfect solutions of patent lose the protection problems of carrying.Moreover the structure that belt combines with wire rope makes this oil pumper complicated integral structure, and floor space is big, is unfavorable for installation and maintenance.

Also have some oil pumpers on the structure of amplification and transmission traction, to adopt assembly pulley and wire rope.The advantage of assembly pulley is that transmission efficiency is high, simple in structure, and use and maintenance cost are low.Like notification number is that " a kind of T type sister block group oil pumper " and the notification number of CN201221340Y is CN201599009U " pulley transmission oil pumping machine ".These two kinds of schemes all adopt the common traction type oil extractor structure of putting on the motor, promptly rely on assembly pulley suspension counterweight and the sucker rod of one group of wire rope through directive wheel and both sides, and the traction pulling sucker rod that this group wire rope also transmits motor simultaneously moves back and forth.For the hanging function of wire rope, wire rope is long more thicker its application life.Yet for the traction function of wire rope, the ratio of diameter of pulley and wirerope diameter is long more bigger its application life.Under this design concept, in order to guarantee the application life of wire rope, assembly pulley must be done very greatly.This installation and maintenance to machine has increased difficulty, and the cost of pulley also has rising significantly.Simultaneously, above structure Design also has other deficiencies, and for example: CN201221340Y adopts two wire rope one ends to connect counterweight (load) and sucker rod respectively, and the other end all is fixed on the cylinder through assembly pulley.Because the joint bending of wire rope on cylinder is bigger, steel rope abrasion is very big when cylinder rotates, and its safety also declines to a great extent.CN201599009U utilizes the frictional force between wire rope and the traction sheave to transmit traction; Yet, according to its disclosed winding of the wire rope, 180 ° of the cornerite less than of its traction steel-cable on traction sheave; Effective frictional force can't be provided; When transmitting big traction or motor commutation, be easy to generate the wire rope skidding, to the stroke of oil pumper, jig frequency is all influential.And this design produces back-flexing when steel wire penetrating movable pulley and fixed pulley, and this kind winding also can reduce the life-span of wire rope, has increased the difficulty of care and maintenance.

In the design of existing oil pumper, the safeguard structure that oil well is met accident also is one of design difficulty.Its reason is that existing traction type oil extractor is as the basis with the balance of counterweight and sucker rod.Meet accident at oil well, when breaking bar like sucker rod, the equilibrium conditions forfeiture, counterweight can produce the movement of falling object.Because traction provides condition limited, almost can't offset the downward impulse force of counterweight only according to the traction that motor produces.Therefore, need to install extra brake gear bigger traction is provided.For example CN201221340Y has adopted and on cylinder, has connected the flexible brake gear of the automatically controlled one of dish formula machinery, and CN100504068C is provided with brake gear on reducer, and CN201367885Y has placed the brake safe pincers on the balance loaded van.Yet, more than the safeguard structure of three kinds of patents have common defective, i.e. the reliability of security protection can not guarantee.Because along with the increase of oil pumper type, the weight of counterweight also can increase, and several tons of weights are generally all arranged.No matter be mounted on the loaded van, on the cylinder or the brake on the reducer, can't guarantee to stop the movement of falling object of big quality counterweight only according to an one of which device.In addition, the detection when existing traction type oil extractor carries losing also is an a great problem, adopts centrifugal governor to detect counterweight like CN201367885Y and falls.When balance loaded van (the being counterweight) speed of service surpassed qualification speed, the centrifugal governor action drove check mechanism.Yet along with the increase of counterweight falling speed, its kinetic energy also can increase, and brake needs bigger energy to go to stop it to fall, and will cause the safety that protection is carried in whole mistake to reduce.

Existing traction type oil extractor often has a lot of restrictions in the design of drive motors position; Amplify and the structure of transmission traction and the syndeton of wire rope (or flexible band) because the position of motor need be subject to, it can be described as the of paramount importance part of whole oil pumper.The wild environment in oil field means that oil pumper all needs good adaptive capacity under various work condition environments.Yet,, also will mean the restriction of traction type oil extractor to its applied environment to the restriction of motor position because drive motors itself is relatively poor to the adaptive capacity of environment.For example CN100504068C has adopted the design of putting on the motor, because machine gravity on the upper side, the area big at dust storm is equipped with certain risk, and increased the difficulty of maintaining.CN101413386A has adopted the design of provided with motor at lower, because motor is overhead very near, so can't install at the low-lying location or the neritic province domain of often long-pending rain.

The utility model content

The purpose of the utility model provides a kind of indirect-drive towed formula oil pumper, and the traction that fundamentally solves existing traction type oil extractor existence is limited, and belt life is short, loses to carry the protection deficiency; Problems such as applied environment is restricted, it is reasonable in design compared with similar products, stressed distributing equilibrium; Compact conformation, volume is little, in light weight, and cost is low, has safe and reliable to operation; Traction is big, and transmission efficiency is high, whole machine installation and easy to maintenance, advantage applied widely.

The technical scheme that the utility model adopted is: this indirect-drive towed formula oil pumper comprises the support that is fixed with frame, be arranged on the hanging steel rope that sucker rod and counterweight is suspended on the suspension sheave both sides respectively, the drag device of suspension arrangement on the frame the permagnetic synchronous motor that is fixed on the driving traction sheave on the motor cabinet, walk around traction sheave two ends through assembly pulley respectively with traction steel-cable to reconnecting, its technical essential is: the fixedly upper and lower motor cabinet of permagnetic synchronous motor is set respectively on said frame and support; Rotor set on the traction sheave of drag device and the permagnetic synchronous motor driving main shaft is fitted together, and the end of the main shaft of permagnetic synchronous motor is provided with encoder; Drum-type lock arm is installed in the both sides of braked wheel, is connected with the electromagnetic brake on permagnetic synchronous motor top; Left and right traction steel-cable is respectively in the same way on same traction sheave; One end of left and right traction steel-cable is walked around respectively by being fixed on following fixed pulley on the support, being fixed on the downslide wheels that the following movable pulley of counterweight bottom constitutes, and utilizing down, the fag end combination is fixed on the support; The other end of left and right traction steel-cable is walked around the directive wheel that is fixed on the frame respectively; By being fixed on last left and right fixed pulley on the frame, being fixed on two top sheave groups that the last left and right movable pulley on counterweight top constitutes; The fag end combination is fixed on the frame in the utilization, and the groove number of said upper and lower assembly pulley middle pulley matches with the number of turns that traction steel-cable twines.

The snubber bearing that is fixed on the said support is provided with lower bumper, and counterweight top is provided with upper bumper.

The pulley that the directive wheel of said frame top and the traction sheave on the permagnetic synchronous motor adopt same specification, its pulley grooved and separation are all identical.

Advantage and the good effect that the utlity model has are: the utility model adopted the notification number of technology maturation be in " the gearless counterweight traction type oil extractor of provided with motor at lower " of CN101413386A suspension arrangement, through last suspension sheave the hanging function and the traction function of oil pumper wire rope are separated.Hanging steel rope only need satisfy hanging function like this, can design very slightly, and to increase application life and safety factor, traction steel-cable only need satisfy extra traction, can design very carefully, to reduce the diameter of traction sheave and pulley.Because left and right traction steel-cable is respectively in the same way on same traction sheave; One end of left and right traction steel-cable is walked around respectively by being fixed on following fixed pulley on the support, being fixed on the downslide wheels that the following movable pulley of counterweight bottom constitutes, and utilizes down that the fag end combination is fixed on the support, and the other end of left and right traction steel-cable is walked around the directive wheel that is fixed on the frame respectively; By being fixed on last left and right fixed pulley on the frame, being fixed on two top sheave groups that the last left and right movable pulley on counterweight top constitutes; The fag end combination is fixed on the frame in the utilization, and is so it compared with similar products, reasonable in design; Stressed distributing equilibrium has also increased safety.The groove number of upper and lower assembly pulley middle pulley matches with the number of turns that traction steel-cable twines, and according to the difference of traction steel-cable to the upper and lower assembly pulley middle pulley winding number of turns, can amplify the pulling force of traction steel-cable to counterweight on demand.The ratio of traction being amplified through upper and lower assembly pulley and the efficient of transmission are high more than reducer, safeguard and install also more convenient.Owing to provide the cost of the permagnetic synchronous motor of traction to be directly proportional, therefore make the cost of permagnetic synchronous motor descend significantly, thereby greatly reduce the cost of whole traction type oil extractor with its output torque.The more important thing is that owing to adopted the principle of counterweight traction, traction steel-cable only need spur the weight difference of counterweight and beam hanger, cooperate the winding repeatedly of wire rope, the every needed load of wire rope has been greatly diminished.Under the prerequisite that guarantees rope service-life, the diameter of wire rope and assembly pulley can reduce, and has promptly reduced the cost of machine, has reduced the difficulty of installing and safeguarding again.

The utility model utilizes same traction steel-cable to twine upper and lower assembly pulley simultaneously, is connected on support and the frame through fag end, therefore in the safety of steel cable termina, has had to increase substantially.Simultaneously, the utility model adopts winding in the same way all the time when wire rope twines the slide down wheels repeatedly, avoided the back-flexing of wire rope, to also improving a lot its application life.

Rotor set on the traction sheave of the utility model drag device and the permagnetic synchronous motor driving main shaft is fitted together, and traction steel-cable is at traction sheave and twine down several weeks on the fixed pulley to increase the contact area of itself and traction sheave.The combination of fag end up and down that connects traction steel-cable can make its being attached on the traction sheave tightly for wire rope provides enough pretightning forces; Therefore belt pulley distinctive " skidding " phenomenon can not appear when motor operation or switching-over; The wearing and tearing of wire rope have been reduced; Whole traction transmission mechanism also becomes simply simultaneously, for installation and maintenance provides convenience.

Meet accident at oil well, when breaking bar like sucker rod, the forfeiture of hanging balancing state.Counterweight can produce the freely falling body phenomenon.Because permagnetic synchronous motor has been installed encoder, its control system can take the band-type brake action losing the freely falling body action that detects counterweight in a flash accurately of carrying under the also very low situation of the relative velocity of counterweight.When opening band-type brake,, can produce very big frictional resistance to braked wheel because the drum-type lock arm of installing has played the effect of lever.Because the utility model has adopted traction steel-cable to connect the top sheave group, its pulling force can be amplified by the assembly pulley secondary, is enough to reduce even offsets the downward impulse force of counterweight.Because the utility model has designed two traction steel-cables and has connected upper and lower assembly pulley simultaneously, is wrapped on the traction sheave simultaneously.If wherein steel cable fracture when mistake is carried, the traction that the motor band-type brake produces can all act on the other steel cable, and its pulling force that provides is equal to two wire rope, can play a protective role equally.The utility model is provided with polyurethane bumper absorber in the following junction of counterweight top and support.Malfunctioning as if check mechanism, the counterweight tenesmus is the contact lower bumper earlier, utilizes the kinetic energy of the deformation absorption counterweight of polyurethane, avoids the pumping unit shelf structure is damaged.Upper and lower snubber can also prevent that counterweight from moving up and down too much, promptly protects the pumping unit shelf structure, also can protect underground oil well pump to prevent to damage towards pump.Because it is cold-resistant, heat-resisting that polyurethane has, difficult deformation, characteristics such as can not get rusty, the reliability of this anticollision device, collision-prevention device also increase greatly.Above triple protection mechanism makes the utility model on safety of lose carrying the protection structure and reliability, have greatly to improve.

The utility model is provided with the fixedly upper and lower motor cabinet of permagnetic synchronous motor respectively on frame and support, two directive wheels and traction sheave are designed to the pulley of same specification, and its pulley grooved and separation are all identical.Because upper and lower assembly pulley is a symmetrical structure; And permagnetic synchronous motor can directly link to each other with traction sheave; Therefore only need to change winding of the wire rope, just the function of traction sheave and directive wheel can transposition, motor can be installed in above the frame (as low-lying as required; The location or the shallow sea of frequent ponding) or below (big like wind, as to need the location of often safeguarding).Compare with existing oil pumper product, the utility model has increased the scope of the type oil pumper applied environment.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of a kind of provided with motor at lower of the utility model;

Fig. 2 is the sectional view of Fig. 1 along the A-A line;

Fig. 3 is the syndeton vertical view of traction sheave and following fixed pulley among Fig. 1;

Fig. 4 is a kind of structural representation of carrying means among Fig. 1;

Fig. 5 is the sectional view of Fig. 4 along the B-B line;

The structural representation of Fig. 6 for putting on a kind of motor of the utility model.

Sequence number explanation among the figure: suspension sheave on 1; 2 hanging steel ropes; 3 sucker rods; 4 supports; 5 snubber bearings; 6 times fixed pulleys; 7 lower bumpers; 8 times movable pulley; Right movable pulley on 9; Left movable pulley on 10; Right fixed pulley on 11; Left fixed pulley on 12; Fag end combination on 13; 14 hanging steel rope joints; 15 directive wheels; 16 upper bumpers; 17 counterweight guide rails; 18 counterweights; 19 frames; 20 times fag end combinations; 21 right traction steel-cables; 22 left traction steel-cables; 23 traction sheaves; 24 drum-type lock arms; 25 permagnetic synchronous motors; 26 braked wheels; 27 electromagnetic brakes; 28 encoders; 29 electric machine main shafts; 30 bolts; Motor cabinet on 31; 32 times motor cabinets.

The specific embodiment

Specify the concrete structure of the utility model according to Fig. 1～5.Parts such as this indirect-drive towed formula oil pumper comprises frame 19, support 4, be arranged on suspension arrangement on the frame 19, drag device.Wherein suspension arrangement does not have traction power, and only plays the effect of balance bearing capacity basically.It comprises the last suspension sheave 1 that is arranged on frame 19 tops; Last suspension sheave 1 is suspended on suspension sheave 1 both sides through hanging steel rope 2 respectively with sucker rod 3 and counterweight 18; Along with sucker rod 3 oil pumping that moves up and down, counterweight 18 moves up and down in frame 19 inside along guide rail 17.The last suspension sheave 1 that is arranged on frame 19 tops is unpowered mechanism, only plays suspension and guide effect, so that its diameter can be done is very big.The diameter of hanging steel rope 2 depends on the suspended weights of suspension arrangement and the diameter of last suspension sheave 1, thus can select single thicker wire rope as hanging steel rope 2 to increase its application life.Drag device mainly comprises traction sheave 23, is fixed on the directive wheel 15 of frame 19 tops and is fixed on frame 19, the assembly pulley on support 4 and the counterweight 18.Go up left fixed pulley 12, go up the top that right fixed pulley 11 is fixed on frame 19, go up left movable pulley 10; Go up right movable pulley 9 and be fixed on the top of counterweight 18, more than two groups of fixed pulleys and movable pulley formed two groups of top sheave groups respectively, fixed pulley is last; Movable pulley is down, for counterweight 18 provides pulling force upwards.Following movable pulley 8 is fixed on the bottom of counterweight 18, and following fixed pulley 6 is fixed on the support 4, and their form movable pulley last, fixed pulley under the downslide wheels, for counterweight 18 provides downward pulling force, more than three groups of assembly pulleys form the upper and lower assembly pulley of these oil pumpers.

Left and right traction steel- cable 22,21 is respectively in the same way on same traction sheave 23.One end of left and right traction steel- cable 22,21 is walked around by being fixed on following fixed pulley 6 on the support 4, being fixed on the downslide wheels that the following movable pulley 8 of counterweight 18 bottoms constitutes simultaneously, and utilizing down, fag end combination 20 is fixed on the support 4.The other end of left and right traction steel- cable 22,21 is walked around the directive wheel 15 that is fixed on the frame 19 respectively; By being fixed on last left and right fixed pulley 12,11 on the frame 4, being fixed on two top sheave groups that the last left and right movable pulley 10,9 on counterweight 18 tops constitutes; Fag end combination 13 is fixed on the frame 19 in the utilization, and the groove number of above-mentioned upper and lower assembly pulley middle pulley matches with the number of turns that traction steel- cable 22,21 twines.According to the difference of twining the number of turns, can amplify the pulling force of 22,21 pairs of counterweights 18 of traction steel-cable on demand.Crooked to same direction all the time when traction steel- cable 22,21 is walked around the slide down wheels, avoid the back-flexing wire rope.

Rotor set on the traction sheave 23 of drag device and the driving main shaft 29 of permagnetic synchronous motor 25 is fitted together.For enough tractions are provided, left and right traction steel- cable 22,21 is before twining the slide down wheels, earlier at traction sheave 23 and twine several weeks down on the fixed pulley 6 to increase the contact area of itself and traction sheave 23.

End at the main shaft 29 of permagnetic synchronous motor 25 is provided with encoder 28, and braked wheel 26 has been installed on main shaft 29.Braked wheel 26 is fixing through bolt 30 with the relative position of traction sheave 23 on main shaft 29.Drum-type lock arm 24 is installed in the both sides of braked wheel 26, is connected with the electromagnetic brake 27 on permagnetic synchronous motor 25 tops.When the oil well something unexpected happened, like sucker rod 3 disconnected bars, the forfeiture of hanging balancing condition, counterweight 18 can produce the freely falling body phenomenon.Losing the moment of carrying, encoder 28 detects the freely falling body action of counterweight, through drum-type lock arm 24 closures on the electromagnetic brake 27 operation permagnetic synchronous motors 25.This closed action through drum-type lock arm 24 with braked wheel 26 embracing tightly; About the frictional force that both produced is delivered to through traction sheave 23 on two traction steel- cables 22,21; Again through last left and right fixed pulley 12,11; Go up left and right movable pulley 10,9 pulling force on the wire rope is amplified, finally affact on the counterweight 18, make it be enough to reduce even offset the downward impulse force of counterweight 18.

The snubber bearing 5 that is fixed on the support 4 is provided with lower bumper 7, and counterweight 18 tops are provided with upper bumper 16.Wherein go up the cylinder that lower bumper 16,7 is processed for polyurethane material, flexible.If check mechanism is malfunctioning, counterweight 18 tenesmus are contact lower bumper 7 earlier, and most kinetic energy when the deformation meeting of its polyurethane material absorbs counterweight 18 tenesmus plays cushioning effect, with the impact that reduces counterweight 18 the oil pumper structure is damaged.In addition, upper and lower snubber 16,7 can limit the stroke of counterweight 18 when oil pumper normally moves, and on the counterweight 18 that prevents to cause because of control system down, the lower direction operation too much.

Directive wheel of frame 19 tops 15 and the traction sheave 23 on the permagnetic synchronous motor 25 are designed to the pulley of same specification, and its pulley grooved and separation are all identical, reserve in the middle of the directive wheel and go up motor cabinet 31.If need to put on the motor, then permagnetic synchronous motor 25 is separated with traction sheave 23, pull down from following motor cabinet 32, be installed on the motor cabinet 31, connect directive wheel 15.This moment, left and right sides traction steel- cable 21,22 windings were slightly different, were about to directive wheel 15 and as traction sheave 23 traction were provided, and traction sheave 23 is connected fixed pulley 6 and movable pulley 8 down down as directive wheel 15.

Claims (3)

1. indirect-drive towed formula oil pumper; Comprise the support that is fixed with frame, be arranged on the hanging steel rope that sucker rod and counterweight is suspended on the suspension sheave both sides respectively, the drag device of suspension arrangement on the frame the permagnetic synchronous motor that is fixed on the driving traction sheave on the motor cabinet, walk around traction sheave two ends through assembly pulley respectively with traction steel-cable to reconnecting, it is characterized in that: the fixedly upper and lower motor cabinet of permagnetic synchronous motor is set respectively on said frame and support; Rotor set on the traction sheave of drag device and the permagnetic synchronous motor driving main shaft is fitted together, and the end of the main shaft of permagnetic synchronous motor is provided with encoder; Drum-type lock arm is installed in the both sides of braked wheel, is connected with the electromagnetic brake on permagnetic synchronous motor top; Left and right traction steel-cable is respectively in the same way on same traction sheave; One end of left and right traction steel-cable is walked around respectively by being fixed on following fixed pulley on the support, being fixed on the downslide wheels that the following movable pulley of counterweight bottom constitutes, and utilizing down, the fag end combination is fixed on the support; The other end of left and right traction steel-cable is walked around the directive wheel that is fixed on the frame respectively; By being fixed on last left and right fixed pulley on the frame, being fixed on two top sheave groups that the last left and right movable pulley on counterweight top constitutes; The fag end combination is fixed on the frame in the utilization, and the groove number of said upper and lower assembly pulley matches with the number of turns that traction steel-cable twines.

2. indirect-drive towed formula oil pumper according to claim 1 is characterized in that: the snubber bearing that is fixed on the said support is provided with lower bumper, and counterweight top is provided with upper bumper.

3. indirect-drive towed formula oil pumper according to claim 1 is characterized in that: the pulley that the directive wheel of said frame top and the traction sheave on the permagnetic synchronous motor adopt same specification, its pulley grooved and separation are all identical.

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