阅读说明：本技术 一种钻井泵滑动轴承连杆部件的精度保证方法 (Precision guarantee method for drill pump sliding bearing connecting rod component ) 是由 黄秀芳 于 2021-09-22 设计创作，主要内容包括：本发明公开了一种钻井泵滑动轴承连杆部件的精度保证方法,涉及石油工程设备领域,具体包括连杆螺栓、滑动轴承连杆体、连杆轴瓦、连杆铜套、滑动轴承连杆体端面、连杆轴瓦内孔轴心、连杆铜套内孔轴心、连杆轴瓦内孔、连杆铜套内孔等,滑动轴承连杆体大端保持剖分式结构,小端设计成整体结构,连杆轴瓦内孔和连杆铜套内孔单边留0.5～1.0mm的余量,将滑动轴承连杆部件装配后,用滑动轴承连杆体端面为第一定位基准、连杆轴瓦内孔轴心为第二定位基准、连杆铜套内孔轴心为第三定位基准,加工连杆轴瓦内孔和连杆铜套内孔到成品精度,可将连杆轴瓦内孔和连杆铜套内孔圆柱度精度提高3级,杜绝因精度低造成连杆轴瓦和连杆铜套粘连现象。(The invention discloses a precision guarantee method of a drilling pump sliding bearing connecting rod component, which relates to the field of petroleum engineering equipment and specifically comprises a connecting rod bolt, a sliding bearing connecting rod body, a connecting rod bearing bush, a connecting rod copper bush, a sliding bearing connecting rod body end surface, a connecting rod bearing bush inner hole axis, a connecting rod copper bush inner hole axis, a connecting rod bearing bush inner hole, a connecting rod copper bush inner hole and the like, wherein the large end of the sliding bearing connecting rod body is kept in a split structure, the small end is designed into an integral structure, a margin of 0.5-1.0 mm is reserved on a single side of the connecting rod bearing bush inner hole and the connecting rod copper bush inner hole, after the sliding bearing connecting rod component is assembled, the sliding bearing connecting rod body end surface is used as a first positioning reference, the connecting rod bearing bush inner hole axis is used as a second positioning reference, the connecting rod copper bush inner hole axis is used as a third positioning reference, the connecting rod bearing bush inner hole and the connecting rod copper bush inner hole are machined to the finished product precision, the cylindricity precision of the connecting rod bearing bush inner hole and the connecting rod copper bush inner hole can be improved by 3 level, the phenomenon of adhesion between the connecting rod bearing bush and the connecting rod copper bush caused by low precision is avoided.)

1. The precision guaranteeing method of the drilling pump sliding bearing connecting rod component is characterized by comprising a connecting rod bolt (1), a sliding bearing connecting rod body (2), a connecting rod bearing bush (3), a connecting rod copper bush (4), a sliding bearing connecting rod body end face (5), a connecting rod bearing bush inner hole axis (6), a connecting rod copper bush inner hole axis (7), a positioning pin (8), a connecting rod bearing bush inner hole (9), a connecting rod copper bush inner hole (10) and a limiting screw (11).

2. The method for ensuring the accuracy of the sliding bearing connecting rod component of the drilling pump as claimed in claim 1, wherein the large end of the sliding bearing connecting rod body (2) is kept in a split structure, and the small end is designed into an integral structure.

3. The method for ensuring the accuracy of a sliding bearing connecting rod component of a drilling pump as claimed in claim 1, wherein a margin of 0.5-1.0 mm is left on one side of an inner hole of a connecting rod bearing bush and an inner hole of a connecting rod copper bush, and after the sliding bearing connecting rod component is assembled, the inner hole of the connecting rod bearing bush and the inner hole of the connecting rod copper bush are machined to the finished product accuracy by using the end face of the sliding bearing connecting rod body as a first positioning reference, the shaft center of the inner hole of the connecting rod bearing bush as a second positioning reference and the shaft center of the inner hole of the connecting rod copper bush as a third positioning reference.

Technical Field

The invention relates to the field of petroleum engineering equipment, in particular to a precision guarantee method for a sliding bearing connecting rod component of a drilling pump.

Background

A drilling pump is developed in the market at present, the traditional drilling pump rolling bearing connecting rod part is changed into a sliding bearing connecting rod part, namely a rolling bearing of which the large hole of the connecting rod part is connected with a connecting rod journal of a crankshaft is replaced by a connecting rod bearing bush sliding bearing, and a rolling bearing of which the small end hole of the connecting rod part is connected with a crosshead pin is replaced by a connecting rod copper bush sliding bearing, so that the volume of the original drilling pump is greatly reduced, and the weight is greatly reduced. In order to facilitate the assembly and the replacement of the connecting rod bearing bush at the large end and the connecting rod copper sleeve at the small end of the connecting rod part, the large end and the small end of the connecting rod are designed into split structures, namely, the connecting rod bearing bush at the large end and the connecting rod copper sleeve at the small end of the connecting rod are damaged and then the connecting rod bearing bush and the connecting rod copper sleeve can be replaced only by disassembling the large end cover and the small end cover. Through user's application practice, appear connecting rod axle bush and the crank shaft connecting rod axle journal adhesion phenomenon of connecting rod main aspects, appear connecting rod copper sheathing and the cross head round pin adhesion phenomenon of connecting rod tip, through the research, it is not high to appear one of the important reason of adhesion to appear connecting rod part's precision, and several following key precision of original connecting rod part are low:

1. the parallel precision between the inner hole of the big end connecting rod bearing bush and the inner hole of the small end connecting rod copper bush is not high after the connecting rod parts are assembled;

2. the size precision of the inner hole of the big-end connecting rod bearing bush is not high after the connecting rod part is assembled;

3. the cylindricity precision of the inner hole of the big-end connecting rod bearing bush is not high after the connecting rod part is assembled;

4. the size precision of the inner hole of the small-end connecting rod copper sleeve is not high after the connecting rod part is assembled;

5. the cylindricity precision of the inner hole of the small-end connecting rod copper sleeve is not high after the connecting rod part is assembled.

Because the crankshaft connecting rod mechanism of the drilling pump is characterized by very low rotating speed and very high load, and the two characteristics are the most adverse factors for forming an oil film by a sliding bearing, the big end and the small end of the connecting rod component of the drilling pump all over the world are rolling bearings at present. After the sliding bearings are changed, the necessary thickness of the oil film between the sliding bearings must be ensured, but the oil film between the inner hole of the connecting rod bearing bush and the crankshaft connecting rod journal and between the inner hole of the connecting rod copper bush and the outer circle of the crosshead pin is greatly reduced due to the errors in the above 5 aspects, so that the adhesion phenomenon occurs, and the precision in the above 5 aspects must be improved to avoid the adhesion phenomenon.

The reason why the precision of the above five aspects of the original connecting rod component is low is that the connecting rod body, the connecting rod bearing bush and the connecting rod copper bush of the connecting rod component are designed into completely-interchangeable parts, and the influence factors of the above five aspects after the three parts are assembled are respectively as follows:

1. the factors influencing the low parallel precision between the inner hole of the big end connecting rod bearing bush and the inner hole of the small end connecting rod copper bush after the connecting rod part is assembled comprise the parallelism between the big and small holes of the connecting rod body, the wall thickness error of the connecting rod bearing bush and the wall thickness error of the connecting rod copper bush;

2. the influence factors that the dimensional accuracy of the inner hole of the big-end connecting rod bearing bush is not high (the size can meet IT8 level) after the connecting rod part is assembled comprise the dimensional error of the big-end hole of the connecting rod body, the dimensional error of the excircle of the connecting rod bearing bush and the dimensional error of the inner hole;

3. the influence factors that the cylindricity precision of the inner hole of the big-end connecting rod bearing bush is not high (the strength can meet 9 levels) after the connecting rod part is assembled are the cylindricity error of the big-end hole of the connecting rod body, the cylindricity error of the excircle of the connecting rod bearing bush, the cylindricity error of the inner hole of the connecting rod bearing bush and the error that the deformation in all directions is inconsistent after the big-end hole of the connecting rod is in interference fit with the excircle of the connecting rod bearing bush;

4. the influence factors that the size precision of the inner hole of the small-end connecting rod copper sleeve is not high (the size can meet IT8 level in an effort) after the connecting rod component is assembled are the size error of the small-end hole of the connecting rod, the size error of the excircle of the connecting rod copper sleeve and the size error of the inner hole of the connecting rod copper sleeve;

5. the influence factors that the cylindricity precision of the inner hole of the small-end connecting rod copper sleeve is not high (9-grade can be met by very hard effort) after the connecting rod part is assembled are the cylindricity error of the small-end hole of the connecting rod, the circular axis error of the excircle of the connecting rod copper sleeve, the cylindricity error of the inner circle of the connecting rod copper sleeve and the error that the deformation of the small-end hole of the connecting rod and the excircle of the connecting rod copper sleeve in all directions is inconsistent.

After the five reasons of low precision of the connecting rod part are found out, which cause the adhesion of the connecting rod bearing bush and the connecting rod copper bush, it is a problem to be solved urgently to research a precision guarantee method of the drilling pump sliding bearing connecting rod part.

Disclosure of Invention

The invention aims to provide a precision guarantee method for a sliding bearing connecting rod component of a drilling pump.

The technical scheme of the invention is as follows:

the connecting rod big end keeps the subdivision formula structure, and is really convenient because of the assembly, but the connecting rod tip hole need not the subdivision formula structure, designs into overall structure, because the user appears when the connecting rod copper sheathing and the cross head pin adhesion of connecting rod tip are in the same place, does not tear the lid of connecting rod tip at all, and the subdivision formula structure just does not play a role.

When a connecting rod bearing bush at the large end of a connecting rod part is machined according to an original designed pattern, a single edge of an inner hole of the connecting rod bearing bush is required to be left with a margin of 0.5-1.0 mm, and the rest is not changed;

when a connecting rod copper sleeve at the small end of a connecting rod part is machined according to an originally designed pattern, a margin of 0.5-1.0 mm needs to be reserved on one side of an inner hole of the connecting rod copper sleeve, and the rest is not changed;

after 3 main parts of the connecting rod component are assembled, the end face of the connecting rod body is used as a first positioning reference to limit one degree of freedom and two degrees of freedom of rotation, the axis of the inner hole of the connecting rod bearing bush is used as a second positioning reference to limit 2 degrees of freedom of movement, and the axis of the connecting rod copper bush is used as a third positioning reference to limit one degree of freedom of rotation, so that the 6 degrees of freedom of the connecting rod component are completely limited, the inner holes of the connecting rod bearing bush and the connecting rod copper bush can be precisely machined to the size of a finished product, and the method can well ensure the following five reasons of high precision as follows:

1. after the connecting rod part is assembled, the influence factor of the parallel precision between the inner hole of the bearing bush of the big end connecting rod and the inner hole of the copper bush of the small end connecting rod is only related to the precision of the machine tool;

2. the influence factors of the dimensional accuracy of the inner hole of the big-end connecting rod bearing bush after the connecting rod part is assembled are only related to the accuracy of the machine tool;

3. the influence factor of high cylindricity precision of the inner hole of the big-end connecting rod bearing bush after the connecting rod part is assembled is only related to the precision of the machine tool;

4. the influence factors of the dimensional accuracy of the inner hole of the copper sleeve of the small-end connecting rod after the connecting rod part is assembled are only related to the accuracy of the machine tool;

5. the influence factors of the cylindricity precision of the inner hole of the small-end connecting rod copper bush after the connecting rod part is assembled are only related to the precision of the machine tool;

therefore, the precision of the connecting rod part can be ensured very well by selecting a machine tool meeting the precision requirement.

After the connecting rod part has high precision, the phenomenon of adhesion between the connecting rod bearing bush and the connecting rod copper bush caused by low precision can be avoided.

Drawings

FIG. 1 is a front and top view of a drill pump plain bearing connecting rod component;

FIG. 2-section A-A of FIG. 1;

FIG. 3-section B-B of FIG. 1;

FIG. 4-the same cross-sectional view of the drill pump plain bearing connecting rod component as in FIG. 3 prior to modification;

figures 5-2200hp wellbore pump rolling bearing connecting rod components and 2400hp wellbore pump sliding bearing connecting rod components are comparative figures.

The reference numbers are as follows:

1-connecting rod bolt, 2-sliding bearing connecting rod body, 3-connecting rod bearing bush, 4-connecting rod copper bush, 5-sliding bearing connecting rod body end face, 6-connecting rod bearing bush inner hole axle center, 7-connecting rod copper bush inner hole axle center, 8-positioning pin, 9-connecting rod bearing bush inner hole, 10-connecting rod copper bush inner hole, 11-limiting screw, 12-connecting rod body small end cover, 13-spring washer, 14-screw, 15-rolling bearing connecting rod body, 16-big end rolling bearing and 17-small end rolling bearing.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The embodiments of the present invention are not limited to the following examples, and various changes made without departing from the spirit of the present invention are within the scope of the present invention.

Referring to fig. 1 to 5, the method for ensuring the precision of a sliding bearing connecting rod component of a drilling pump according to the present embodiment includes a connecting rod bolt 1, a sliding bearing connecting rod body 2, a connecting rod bush 3, a connecting rod copper bush 4, a sliding bearing connecting rod body end surface 5, a connecting rod bush inner hole axis 6, a connecting rod copper bush inner hole axis 7, a positioning pin 8, a connecting rod bush inner hole 9, a connecting rod copper bush inner hole 10, a limit screw 11, a connecting rod body small end cover 12, a spring washer 13, a screw 14, a rolling bearing connecting rod body 15, a large end rolling bearing 16, and a small end rolling bearing 17.

Referring to fig. 1 to 4, the large end of the connecting rod body 2 of the sliding bearing is designed into the integral structure of fig. 3 because of the assembly requirement, but the small end hole of the connecting rod does not need the split structure as shown in fig. 4, because firstly, the small end split of the connecting rod shown in fig. 4 needs to increase the manufacturing cost of the connecting rod body, the working procedure is to split the small end of the connecting rod body, the split surface needs to be precisely processed after the splitting, the small end cover 12 of the connecting rod body is combined after the splitting, the structure of repeated positioning needs to be added, and 6 spring washers 13 and 6 screws 14 need to be added; reason two, increase the blank length, because still need the processing material after cutting open. The reason why the split structure does not work is that the user does not detach the small end cover 12 of the connecting rod body when the connecting rod copper sleeve and the crosshead pin at the small end of the connecting rod are adhered together.

Referring to fig. 2, when the connecting rod bearing shell 3 is processed according to the originally designed pattern, only a margin of 0.5-1.0 mm is left on one side of the inner hole 9 of the connecting rod bearing shell, and the rest is not changed; when the connecting rod copper sleeve 4 is processed according to the originally designed pattern, only 0.5-1.0 mm of allowance is left on one side of the inner hole 10 of the connecting rod copper sleeve, and the other sides are not changed.

Referring to fig. 1, after the sliding bearing connecting rod component is assembled, the sliding bearing connecting rod body end surface 5 is used as a first positioning reference to limit the degree of freedom of movement of the Z axis, the degree of freedom of rotation of the X axis and the degree of freedom of rotation of the Y axis, the connecting rod bearing bush inner hole axis 6 is used as a second positioning reference to limit the degree of freedom of movement of the X axis and the degree of freedom of movement of the Y axis, and the connecting rod copper bush inner hole axis 7 is used as a third positioning reference to limit the degree of freedom of rotation of the Z axis, so that the 6 degrees of freedom of the space of the connecting rod component are completely limited, and the connecting rod bearing bush inner hole 9 and the connecting rod copper bush inner hole 10 can be precisely machined to the finished size, and the method can well ensure the following five reasons of high precision:

1. after the connecting rod part is assembled, the influence factor of the parallel precision (between 3-level and 4-level) between the inner hole of the bearing bush of the big end connecting rod and the inner hole of the copper bush of the small end connecting rod is only related to the precision of the machine tool;

2. the influence factor of the dimensional accuracy (IT 7 grade) of the big end connecting rod bearing bush inner hole after the connecting rod part is assembled is only related to the accuracy of the machine tool;

3. the influence factor of the cylindricity precision (6 grade) of the inner hole of the big-end connecting rod bearing bush after the connecting rod part is assembled is only related to the precision of the machine tool;

4. the influence factor of the dimensional accuracy (IT 7 grade) of the inner hole of the small-end connecting rod copper sleeve after the connecting rod part is assembled is only related to the accuracy of the machine tool;

5. the influence factor of the cylindricity precision (6 grade) of the inner hole of the small-end connecting rod copper sleeve after the connecting rod part is assembled is only related to the precision of the machine tool;

therefore, the precision of the connecting rod part can be ensured by selecting the machine tool meeting the precision requirement.

After the precision guarantee method for the drilling pump sliding bearing connecting rod component is adopted, the parallel precision between the connecting rod bearing bush inner hole 9 and the connecting rod copper sleeve inner hole 10 of the sliding bearing connecting rod component can be improved by one level, the dimensional precision of the connecting rod bearing bush inner hole 9 and the connecting rod copper sleeve inner hole 10 can be improved by 1 level, the cylindricity precision can be improved by 3 levels, the maximum precision of the three precisions for the adhesion of the connecting rod bearing bush and the connecting rod copper sleeve is the cylindricity precision of the connecting rod bearing bush inner hole 9 and the connecting rod copper sleeve inner hole 10, and after the cylindricity precision is improved by 3 levels, the adhesion phenomenon of the connecting rod bearing bush and the connecting rod copper sleeve caused by low precision can be avoided.

Referring to fig. 5, after the conventional rolling bearing connecting rod component of the borehole pump is changed into the sliding bearing connecting rod component, the weight of the connecting rod component is greatly reduced, for example, the sum of the weights of the three parts of the rolling bearing connecting rod body 15, the large-end rolling bearing 16 and the small-end rolling bearing 17 of the original 2200hp borehole pump rolling bearing connecting rod component is 1360kg, wherein the weight of the large-end rolling bearing 16 is 324kg, and the sum of the weights of the three parts of the sliding bearing connecting rod body 2, the connecting rod bush 3 and the connecting rod copper bush 4 of the sliding bearing connecting rod component of the 2400hp borehole pump is only 152 kg, which is 11% of the weight of the three parts of the rolling bearing connecting rod component, and even is 172 kg lighter than the weight of the large-end rolling bearing 16 of the original rolling bearing connecting rod component. It is easier to replace a set of plain bearing link components than to replace the large end rolling bearing 16 in a rolling bearing link component.

The above detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art, and these changes are within the protection of the present invention and also within the protection scope of the present invention.