Forged crankshaft for slurry pump

Abstract

The utility model provides a forged crankshaft for a slurry pump, which belongs to the technical field of parts at the power end of the slurry pump and mainly aims at solving the problems that the existing cast crankshaft can only be integrally cast and integrally processed, and is high in energy consumption, high in manufacturing cost and short in service life. Each group of mounting connection positions comprises six arcs and six planes, the corresponding angle between each arc and each plane is 30 degrees, a flange is arranged on the main shaft, a third crank is arranged at one end of the flange, a second crank is arranged at the other end of the flange, a first crank is arranged at one end, far away from the flange, of the second crank, and two groups of bearing positions are respectively arranged at two ends of the main shaft; a fastening assembly is arranged on the main shaft; the forged crankshaft adopts a novel process of split forging and split machining, all parts can be arranged at the corresponding positions of the main shaft in a hot charging mode after machining is completed, the parts can be replaced at will, maintenance is convenient, the manufacturing cost is reduced, and convenience is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mud pump power end spare part technical field, more specifically, it is particularly related to the forged crankshaft for mud pump. BACKGROUND

[0002] As the key equipment in the oil and gas exploitation process, mud pump plays a more important role in exploration, drilling, production and other aspects. Mud pump mainly drives through hydraulic drive, pumps mud and other materials to underground pipeline or wellhead, and provides necessary power support for the whole oil and gas field operation. The crankshaft of mud pump, as one of the core components, is the hub of mud pump for power transmission.

[0003] For example, the Chinese utility model patent with the patent number CN202220704853.3 provides a multi-cylinder mud pump crankshaft. The crankshaft adopts an integrated forged structure with five crank webs and six supports, improves the bearing strength and stiffness of the crankshaft, reduces the weight of the crankshaft, improves the reliability and economy of the power end, and can improve the single-machine displacement of the mud pump by changing the input type of the crankshaft power and increasing the number of crank webs.

[0004] However, the traditional cast crankshaft can only adopt the production process of integral casting and integral machining during processing. The material consumption is high during the casting process, the yield is low, and the traditional cast crankshaft cannot be repaired once it is damaged after being put into use. Only replacement is available, which is low in convenience. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a forged crankshaft for mud pump, which solves the technical problems in the prior art, such as high waste rate of traditional cast crankshafts, only integral casting and integral machining production process, high material consumption during casting process, long production cycle, high cost, and low convenience.

[0006] The purpose and effect of the forged crankshaft for mud pump of the utility model are achieved by the following specific technical means:

[0007] The forged crankshaft for mud pump comprises a main shaft, four groups of installation connection positions are formed on the surface of the main shaft, each group of installation connection positions comprises six circular arcs and six planes, the angle between each circular arc and the corresponding plane is 30°, a flange is arranged on the main shaft, a third crank is arranged at one end of the flange, a second crank is arranged at the other end of the flange, a first crank is arranged at the end of the second crank away from the flange, the first crank, the second crank, the third crank and the flange are in interference connection with the outer wall of the main shaft, two groups of bearing positions are arranged at both ends of the main shaft, and a fastening assembly is arranged on the main shaft.

[0008] As a further scheme of the utility model, the fourth fastening sleeve is arranged between the flange and the third crank, the third fastening sleeve is arranged between the flange and the second crank, two groups of the first fastening sleeve, the second fastening sleeve, the third fastening sleeve and the fourth fastening sleeve are all in interference connection with the outer wall of the main shaft.

[0009] As a further scheme of the utility model, the fourth fastening sleeve is arranged between the flange and the third crank, the third fastening sleeve is arranged between the flange and the second crank, two groups of the first fastening sleeve, the second fastening sleeve, the third fastening sleeve and the fourth fastening sleeve are all in interference connection with the outer wall of the main shaft.

[0010] As a further scheme of the utility model, the fourth fastening sleeve is arranged between the flange and the third crank, the third fastening sleeve is arranged between the flange and the second crank, two groups of the first fastening sleeve, the second fastening sleeve, the third fastening sleeve and the fourth fastening sleeve are all in interference connection with the outer wall of the main shaft.

[0011] As a further scheme of the utility model, the flange, the first crank, the second crank and the third crank all correspond to the mounting connection site, and six arc and six plane are arranged in turn along the circumferential direction.

[0012] As a further scheme of the utility model, the flange is provided with a central through hole, the first crank, the second crank and the third crank are all provided with eccentric through holes at one end, the central through hole and the three eccentric through holes are all regular in shape, the flange is in interference connection with the main shaft through the central through hole, and the first crank, the second crank and the third crank are all in interference connection with the main shaft through the eccentric through holes.

[0013] As a further scheme of the utility model, the first crank, the second crank, the third crank and the main shaft are all provided with a plurality of accessory connection holes at one end, and the flange is provided with a plurality of through holes.

[0014] As a further scheme of the utility model, the plurality of accessory connection holes are all threaded blind holes.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The forged crankshaft can be single-piece forged and single-piece machined with the main shaft, the flange, the three cranks and the five fastening sleeves, after machining, the forged crankshaft can be assembled by hot assembly, compared with the traditional cast crankshaft integral machining, separate forging and machining can enhance the material strength of each part, prolong the service life of the forged crankshaft, and when machining the parts separately, the material can be saved, the consumption of machining material is reduced, and the problems of high material consumption and low yield rate of the traditional cast crankshaft in the casting process are solved.

[0017] 2. After the forged crankshaft is machined and put into use, when the user needs to maintain the forged crankshaft, the main shaft, the flange, the fastening sleeve, the crank and other parts can be disassembled at will, then each part can be individually maintained or replaced, the problem that the user is inconvenient to maintain the cast crankshaft is solved, and the convenience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a sectional view of the forged crankshaft for the mud pump of the utility model;

[0019] Figure 2 is a sectional view of the main shaft in the forged crankshaft for the mud pump of the utility model;

[0020] Figure 3 is a structural schematic view of the main shaft in the forged crankshaft for the mud pump of the utility model;

[0021] Figure 4 is a sectional view of the first fastening sleeve in the forged crankshaft for the mud pump of the utility model;

[0022] Figure 5 is a sectional view of the second fastening sleeve in the forged crankshaft for the mud pump of the utility model;

[0023] Figure 6 is a sectional view of the third fastening sleeve in the forged crankshaft for the mud pump of the utility model;

[0024] Figure 7 is a sectional view of the fourth fastening sleeve in the forged crankshaft for the mud pump of the utility model;

[0025] Figure 8 is a front view of the first crank in the forged crankshaft for the mud pump of the utility model;

[0026] Figure 9 is a sectional view of the first crank in the forged crankshaft for the mud pump of the utility model;

[0027] Figure 10 is a front view of the second crank in the forged crankshaft for the mud pump of the utility model;

[0028] Figure 11 is the sectional view of the second crank in the forged crankshaft for the mud pump of the utility model;

[0029] Figure 12 is the front view of the third crank in the forged crankshaft for the mud pump of the utility model;

[0030] Figure 13 is the sectional view of the third crank in the forged crankshaft for the mud pump of the utility model;

[0031] Figure 14 is the front view of the flange in the forged crankshaft for the mud pump of the utility model;

[0032] Figure 15 is the sectional view of the flange in the forged crankshaft for the mud pump of the utility model.

[0033] In the drawings, the corresponding relationship between the component name and the drawing number is as follows:

[0034] 100, main shaft; 101, first fastening sleeve; 102, second fastening sleeve; 103, third fastening sleeve; 104, fourth fastening sleeve; 106, first crank; 107, second crank; 108, third crank; 109, flange; 110, bearing position; 111, circular arc; 112, plane. DETAILED DESCRIPTION

[0035] The embodiments of the utility model are further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the technical scheme of the utility model, but cannot be used to limit the protection scope of the utility model.

[0036] Example:

[0037] As shown in the accompanying drawings: Figures 1 to 15

[0038] ​The forged crankshaft for mud pump comprises a main shaft 100, four sets of mounting connection positions are arranged on the surface of the main shaft 100, the four sets of mounting connection positions are respectively used for mounting a flange 109, a first crank 106, a second crank 107 and a third crank 108, each set of mounting connection position comprises six arcs 111 and six planes 112, the six arcs 111 and the six planes 112 of each set of mounting connection position are sequentially and equally divided along the circumferential direction, when processing, the outer diameter of the main shaft 100 is equally divided into 12 parts, one plane 112 is processed at an angle of 30 degrees per 60 degrees for each part, the processing tolerance of the position is ±0.025 silk, the circumference is equally divided into six planes 112 and six arcs 111, the six arcs 111 in the mounting connection position provide a positioning basis for the installation of subsequent parts, the six planes 112 provide a connection basis for the installation of subsequent parts, and the six planes 112 replace the traditional key groove connection, the torque resistance and impact force of the six planes 112 far exceed the key groove connection, the flange 109 is arranged on the main shaft 100, one end of the flange 109 is provided with the third crank 108, the other end of the flange 109 is provided with the second crank 107, one end of the second crank 107 away from the flange 109 is provided with the first crank 106, the first crank 106, the second crank 107, the third crank 108 and the flange 109 are in interference connection with the outer wall of the main shaft 100, through the interference fit of the first crank 106, the second crank 107, the third crank 108 and the flange 109 and the main shaft 100, it is ensured that the power can be stably transmitted and the torque and impact force can be borne when the mud pump works, two sets of bearing positions 110 are arranged at both ends of the main shaft 100, the two sets of bearing positions 110 are arranged at one end of the first fastening sleeve 101 away from the flange 109, the bearing position 110 is used for installing a bearing, after the bearing is installed, the bearing position 110 is connected and fixed with the bearing position of the external crankcase, the two sets of bearings can effectively reduce the friction resistance of the main shaft 100 in the rotating process, reduce energy loss, improve the rotating precision and stability of the forged crankshaft, so that the mud pump can continuously and reliably operate in a long-time and high-strength working environment.

[0039] The main shaft 100 is provided with a fastening assembly, which comprises two groups of first fastening sleeves 101, second fastening sleeves 102, third fastening sleeves 103 and fourth fastening sleeves 104. The two ends of the main shaft 100 are respectively provided with two groups of first fastening sleeves 101. One group of first fastening sleeves 101 is arranged at one end of the first crank 106 away from the flange 109. The second fastening sleeve 102 is arranged between the first crank 106 and the second crank 107. The third fastening sleeve 103 and the fourth fastening sleeve 104 are arranged between the second crank 107 and the third crank 108. The other group of first fastening sleeves 101 is arranged at one end of the third crank 108 away from the flange 109. The cooperation of one group of first fastening sleeves 101 and the fourth fastening sleeve 104 can prevent the third crank 108 from shifting during work. The cooperation of the fourth fastening sleeve 104 and the third fastening sleeve 103 can prevent the flange 109 from shifting during work. The cooperation of the third fastening sleeve 103 and the second fastening sleeve 102 can prevent the second crank 107 from shifting during work. The cooperation of the second fastening sleeve 102 and the other group of first fastening sleeves 101 can prevent the first crank 106 from shifting during work. The arrangement of these fastening sleeves ensures the axial and radial stability of the forging crankshaft during work.

[0040] The fourth fastening sleeve 104 is arranged between the flange 109 and the third crank 108. The third fastening sleeve 103 is arranged between the flange 109 and the second crank 107. The two groups of first fastening sleeves 101, the second fastening sleeves 102, the third fastening sleeves 103 and the fourth fastening sleeves 104 are all in interference connection with the outer wall of the main shaft 100. The centers of the first fastening sleeves 101, the second fastening sleeves 102, the third fastening sleeves 103 and the fourth fastening sleeves 104 are all provided with fastening inner holes. These fastening inner holes allow these fastening sleeves to be sleeved on the main shaft 100. When the first fastening sleeves 101, the second fastening sleeves 102, the third fastening sleeves 103 and the fourth fastening sleeves 104 are assembled on the main shaft 100, the interference amount is controlled at about 15 threads.

[0041] The center of the flange 109 is provided with a central through inner hole, and one end of the first crank 106, the second crank 107 and the third crank 108 are provided with an eccentric through inner hole. The central through inner hole and the three sets of eccentric through inner holes are all regular in shape. The flange 109 is connected to the main shaft 100 through the central through inner hole. The first crank 106, the second crank 107 and the third crank 108 are connected to the main shaft 100 through the eccentric through inner hole. The central through inner hole and the eccentric through inner hole correspond to the shape of the mounting connection position of the outer wall of the main shaft 100. 9. The inner diameter circumference of the four positions of the first crank 106, the second crank 107 and the third crank 108 is equally divided into 12 parts, each part is 30 degrees, and an identical plane 112 or arc 111 is machined every 60 degrees, and the inner hole circumference is equally divided into six planes 112 and six arcs 111, so that these inner holes correspond to the six planes 112 and six arcs 111 on the outer wall of the main shaft 100. The flange 109, the first crank 106, the second crank 107 and the third crank 108 are all interference connected with the main shaft 100 through the through inner holes.

[0042] Among them, the main shaft 100, the third crank 108, the fourth fastening sleeve 104, the flange 109, the third fastening sleeve 103, the second crank 107, the second fastening sleeve 102, the first crank 106 and the two first fastening sleeves 101 are all forged with 35Crmo material, and are hot assembled after rough processing, normalizing, tempering and finishing.

[0043] When the flange 109, the first crank 106, the second crank 107, the third crank 108, the two first fastening sleeves 101, the second fastening sleeve 102, the third fastening sleeve 103, the fourth fastening sleeve 104 and the main shaft 100 are all processed, the flange 109, the first crank 106, the second crank 107, the third crank 108 and the five fastening sleeves can be placed in an external heating furnace and heated to about 150-180 degrees Celsius to expand the inner hole to the ideal size, so that the flange 109, the first crank 106, the second crank 107, the third crank 108 and the five fastening sleeves can be easily installed.

[0044] Next, the heated parts are installed on the spindle 100 in the following order: The forged crankshaft is installed starting from the third crank 108, in descending order of spindle 100 diameter: 1. Third clamping sleeve 103, 2. Flange 109, 3. Fourth clamping sleeve 104, 4. Third crank 108, 5. First clamping sleeve 101. Once this side is installed, the other side begins: 1. Second crank 107, 2. Second clamping sleeve 102, 3. First crank 106, 4. First clamping sleeve 101. The assembly is now complete. After the assembled crankshaft cools to room temperature, it is mounted on the machine tool and the bearings 110 at both ends are aligned using a double center.

[0045] It can be understood that, in the hot assembly process, the inner hole type part to be assembled is heated to expand and the inner hole size is increased. When the inner hole size is expanded to be larger than the outer diameter of the shaft type part to be matched, the shaft type part is quickly assembled into the inner hole. After the part is cooled, the inner hole shrinks and tightly grips on the shaft, so as to realize the tight and firm matching, achieve the effect of interference fit, ensure that the parts will not easily loosen or displace during work, and ensure the stability and reliability of the connection.

[0046] By using the hot assembly method, for some parts with large interference, if cold assembly is used, a very large assembly force may be required, and even the parts may be damaged. The hot assembly expands the inner hole by heating, greatly reduces the external force required for assembly, makes the assembly process easier to operate, reduces the requirements for equipment and tools, and the tight fit formed by the hot assembly makes the bonding force between the parts stronger. When bearing the working load, the force can be effectively transmitted, and the parts are not prone to looseness, slippage and other phenomena, improving the reliability and stability of the connection and prolonging the service life of the forged crankshaft.

[0047] The inner hole diameters of the first, second and third cranks 106, 107 and 108 and the flange 109 are set according to the model of the mud pump and the main shaft 100. The first, second and third cranks 106, 107 and 108 and the main shaft 100 are provided with a plurality of threaded blind holes for connecting accessories at one end and the outer wall of the main shaft 100. The flange 109 is provided with a plurality of through holes at one end, and the two bearing positions 110 are in interference connection with the outer wall of the main shaft 100.

[0048] The forged crankshaft can be individually machined with the first, second and third fastening sleeves 101, 102 and 103 and all the above-mentioned parts. During the individual machining process, each part can be machined with appropriate machining process and parameters according to its own structural characteristics and performance requirements, so as to maximize the optimization of the material structure and enhance the material strength. After machining, the forged crankshaft can be assembled by hot assembly. Compared with the traditional integral machining of cast crankshafts, the quality of each part can be improved, the service life of the forged crankshaft can be prolonged, the material usage is more efficient, the excessive waste of materials caused by the need to consider all parts during integral machining is avoided, the consumption of machining materials is greatly reduced, and the problem of high material consumption during the casting process of traditional cast crankshafts is solved. After the forged crankshaft is machined and put into use, when the user needs to maintain the forged crankshaft, it is not necessary to use complex special tools or destructive methods. All parts can be disassembled by following a certain order and standard operation, and then each part can be individually maintained or replaced, solving the problem of inconvenient maintenance of cast crankshafts and improving the convenience.

[0049] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. Forged crankshaft for mud pump, characterized by: The invention comprises a main shaft (100), wherein the main shaft (100) is provided with four groups of mounting connection positions on its surface, wherein each group of the mounting connection positions comprises six arcs (111) and six planes (112), wherein the angles corresponding to each arc (111) and the planes (112) are all 30 degrees, and wherein a flange (109) is provided on the main shaft (100), wherein a third crank (108) is provided at one end of the flange (109), and a crank (108) is provided at the other end of the flange (109). There is a second crank (107), and a first crank (106) is provided at one end of the second crank (107) away from the flange (109). The first crank (106), the second crank (107), the third crank (108) and the flange (109) are all interference-connected with the outer wall of the main shaft (100). Two groups of bearing positions (110) are respectively provided at both ends of the main shaft (100), and a fastening component is provided on the main shaft (100).

2. The forged crankshaft for a mud pump according to claim 1, characterized in that: The fastening assembly includes two groups of first fastening sleeves (101), a second fastening sleeve (102), a third fastening sleeve (103) and a fourth fastening sleeve (104). Two groups of the first fastening sleeves (101) are respectively provided at both ends of the main shaft (100), wherein one group of the first fastening sleeves (101) is provided at one end of the first crank (106) away from the flange (109), the second fastening sleeve (102) is provided between the first crank (106) and the second crank (107), the third fastening sleeve (103) and the fourth fastening sleeve (104) are provided between the second crank (107) and the third crank (108), and the other group of the first fastening sleeves (101) is provided at one end of the third crank (108) away from the flange (109).

3. The forged crankshaft for a mud pump according to claim 2, characterized in that: The fourth fastening sleeve (104) is arranged between the flange (109) and the third crank (108), and the third fastening sleeve (103) is arranged between the flange (109) and the second crank (107). The two groups of the first fastening sleeve (101), the second fastening sleeve (102), the third fastening sleeve (103) and the fourth fastening sleeve (104) are all interference-connected with the outer wall of the main shaft (100).

4. The forged crankshaft for a mud pump according to claim 2, characterized in that: The two groups of bearing positions (110) are both arranged at an end of the first fastening sleeve (101) away from the flange (109).

5. The forged crankshaft for a mud pump according to claim 1, characterized in that: The flange (109), the first crank (106), the second crank (107) and the third crank (108) all correspond to the installation connection position, and the six arcs (111) and the six planes (112) are arranged in sequence along the circumferential direction.

6. The forged crankshaft for a mud pump according to claim 1, characterized in that: The flange (109) is provided with a central through inner hole, and one end of the first crank (106), the second crank (107) and the third crank (108) are all provided with an eccentric through inner hole, and the central through inner hole and the three groups of eccentric through inner holes are all regular in shape. The flange (109) is interference-connected with the main shaft (100) through the central through inner hole, and the first crank (106), the second crank (107) and the third crank (108) are all interference-connected with the main shaft (100) through the eccentric through inner holes.

7. The forged crankshaft for a mud pump according to claim 1, characterized in that: The first crank (106), the second crank (107), one end of the third crank (108) and both end surfaces of the main shaft (100) are respectively provided with a plurality of groups of accessory connection holes, and the flange (109) is provided with a plurality of groups of through holes.

8. The forged crankshaft for a mud pump according to claim 7, characterized in that: The plurality of groups of accessory connection holes are all threaded blind holes.

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