The present invention relates to a mechanical aparatus that extracts underground materials such as oil and so forth. It is a walking beam balanced span and moment regulating economized oil pump and a walking beam oil pump stroke regulating device, the latter of which is especially applicable to fore and rear walking beam oil pumps.
There are a variety of oil pumps which normally fall into the following categories: walking beam oil pumps and non-walking beam oil pumps in terms of the presence of the walking beam; conventional walking beam oil pumps, fore walking beam oil pumps, offset walking beam oil pumps and special-shaped walking beam oil pumps in terms of their structure; crank balance walking beam oil pumps, sidespin walking beam oil pumps, rotary walking beam oil pumps, suspended walking beam oil pumps and double-head walking beam oil pumps in terms of their mode of balance; and motor-driven and diesel-driven walking beam oil pumps in terms of the driving mode.
At present, a walking beam oil pump typically consists of an arc, a walking beam, a support, a pitman, a base, a crank, a decelerator, a power machine, and a string device. The support crank, decelerator, power machine and so on are fixed onto the base of the oil pump and the walking beam is hinged to the support via the central bearing. The pitman is hinged to the crank at one end, and to the walking beam through a bearing at the other end. The arc, on which is mounted the string device, is installed at the front end of the walking beam.
When the oil pump is in operation, the load applied to the string device is called the arc suspension point load. The arc suspension point load varies around a maximum value during the upward oscillation or the up stroke of the arc, and the arc suspension point load varies in the vicinity of a minimum value during the downward oscillation or the down stroke of the arc. Therefore, the power machine is required to produce a large amount of energy during the up stroke whereas in the down stroke, the power machine has to do negative work due to the gravitation instead of producing a large amount of energy. Thus, in order to reduce such irregularity of load, balance devices are attached to oil pumps. However, although some of the oil pumps succeed in saving energy by means of the above-mentioned balance devices, there are many drawbacks with them, such as, complicated structures, poor balance performance, huge dynamic load, high energy consumption, low reliability, inconvenient operation and high costs of maintenance.
In particular, when some under-well technological parameters, such as the diameter of the oil pump, the depth of the deployment of the pump have been changed or when the viscosity of the oil and so on have varied, the difference between the maximum and minimum values of the oil arc suspension point load also varies accordingly. The output of the power machine has to be increased to adapt the oil pumps to such changes, which, however, inevitably increases the consumption of energy.
Cranes are usually needed to adjust the stroke of the conventional waking beam type oil pumps. This is achieved by hoisting the arc first with the crane, then the crank pin assembly connected to the pitman is taken out of the stroke regulating hole of the crank and then mounted in the stroke regulating holes of the crank to which the adjustment is to achieve. The stroke adjustment is not completed until the arc is deposited down and the crane has been driven away. Thus, a complicated series of procedures must be followed whenever adjustment of the stroke is needed, which costs a lot of time and labour, greatly influencing the efficiency of productivity.
With a view to the above problems, one object of the present invention is to provide a walking beam balanced span and moment regulating economized oil pump whose balance can be modified as the difference between the maximum and the minimum values of the arc suspension point load changes. The present invention may further adjust its balance along with the variation of the difference between the maximum and the minimum values of the arc suspension point load.
Another object of the present invention is to overcome the deficiencies of the conventional technology and to provide stroke regulating device applying to a walking beam oil pump which is simple in structure, easy to operate, time-saving and labour-saving.
According to the first aspect of the present invention, the walking beam balanced span and moment regulating economized oil pump consisting of an arc, a walking beam, a support, a pitman, a base, a crank, a decelerator, a power machine, and a string device, is characterized in that the upper or lower part of the front end of the boom is hinged to the rear end of the walking beam while between the lower or upper part of the front end of the boom and the rear end of the walking beam is mounted a weighted arm regulator, and at the rear end of the boom is mounted a weighted device. The boom is made up of at least two segments, each of which is hinged upon each other at the upper part or the lower part of its front end, and between the lower part and the upper pat of the front end of each of the segments is mounted a weighted arm regulator. The weighted arm regulator consists of an adjustable pin roll and a mounting hole, and at the lower part of the front end of the boom there is a mounting hole whose diameter is larger than that of the adjustable pin roll, which is placed between the front end of the boom and the rear end of the waling beam through the hole. A seizure is fixed at the top of the boom corresponding to the mounting hole or at the end of the walking beam, and the seizure comprises at least one seizure notch. The weighted arm regulator consists of a wedge and a lead screw, in which a base plate of the is lead screw is fixed at the front end of the boom or the rear end of the walking beam, and the lead screw is seated on the base plate with the wedge fixed on it. The weighted arm regulator consists of a screw ejector pin and a screw ejector pin base, the latter of which is fixed at the front end of the boom or the rear end of the walking beam and the former mounted on the screw ejector pin base. The weighted means, which is hinged or articulated on the rear end of the boom, consists of an upper weighted box hinged or articulated on the rear end of the boom and at least one lower weighted box which can be mounted on the upper weighted box or removed from the upper weighted box. An unloading bumper bracket is mounted on the base corresponding to the lowest point of the weighted means. The boom is thick at the upper part and thinner at the lower part, thus constituting a uniform strength beam. The boom and the walking beam constitute either a trapezium or an angle or at, arc.
According to the second aspect of the present invention, a walking beam stroke regulating device consisting of an arc, a wailing beam, a support, a pitman, a base, a crank, a decelerator, a power machine, and a string device, is characterized in that the fixing end of the stroke regulating strutting is positioned on the support or the walking beam, and the walking beam or the support corresponding to the strutting end of the stroke regulating strutting has a hinge housing, on which installed by the strutting end of the stroke regulating strutting when regulating the stroke. A guide sleeve is located at the fixing end of the stroke regulating strutting, and the fixing end is constituted by a flexible joint mounted together with the guide sleeve via restrictingnuts. The flexible joint is hinged to the hinge housing of the support or the base of the walking beam, that is, it is connected to the hinge housing of the support or the base of the walking beam with a rotable pin. A nut is placed at the strutting end of the stroke regulating strutting, and a turnbuckle is mounted on the strutting end through the screw nut. There is a restrictingscrew nut inside of the turnbuckle. The strutting end of the stroke regulating strutting is hinged on the hinge housing. The strutting end of the stroke regulating strutting is hinged on the hinge housing via a rotable pin. A split pin is mounted on the rotable pin. There is a hinged lever hole opened on the stroke regulating strutting.