Anti-loosening structure of independent valve cover of drilling pump

Abstract

The utility model discloses an anti-loosening structure of an independent valve cover of a drilling pump, relates to the technical field of drilling pumps, and aims to solve the technical problems that the diameter of a thread for connecting the valve cover of the drilling pump with a valve box is very large, the numerical value of force borne by the valve cover is very large, the borne force belongs to alternating load, and the valve cover needs to work continuously for a long time. The large-diameter threads for connecting the valve cover and the valve box are easy to relatively rotate, the light threads can cause abnormal work of the drilling pump, and the heavy threads can cause serious accidents of the drilling pump, so that the technical scheme for solving the technical problems is that only one anti-loosening clamp and two eccentric wheels need to be manufactured, three inner screw holes are machined in the valve box, and standard screws and anti-loosening washers need to be purchased; the technical problem of looseness prevention of large-diameter threaded connection of the valve cover and the valve box of the drilling pump can be solved by utilizing any one of the regularly polygonal looseness prevention surfaces on the valve cover, the structure is simple, the cost is low, and the looseness prevention performance is safe and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drilling pump technical field, concretely relates to a drilling pump independent valve cover's anti-loose structure. BACKGROUND

[0002] Drilling pump is called the heart equipment of rig, with less and less shallow oil, drilling is more and more deep exploitation, requires that drilling pump provides higher pressure, and the mud liquid of greater displacement, and the hydraulic end of drilling pump is required higher and higher.

[0003] Drilling pump valve cover is a key part of the hydraulic end of drilling pump, and the service life of valve cover directly influences the service life of hydraulic end.

[0004] The hydraulic end of drilling pump designs a pair of valves in each valve box, and the opening and closing of mud liquid are controlled by the valve, and the working condition of valve is very bad, and the hydraulic end of drilling pump is the most short-lived and easily damaged part, and it needs to be checked and replaced frequently, when checking and replacing the valve, the valve cover on the valve box must be opened to operate, and the frequency of checking and replacing the valve is very high, and the frequency of opening and closing the valve cover is also very high.

[0005] The hydraulic end of drilling pump needs to be disassembled to replace the valve, and the valve cover needs to be closed when working, and the valve cover is a necessary condition for controlling the normal work of valve, in order to shorten the auxiliary time of replacing the hydraulic end valve, the valve cover can be quickly installed and disassembled, and the valve cover is safe and reliable in use and has long service life.

[0006] The working characteristics of the valve cover of drilling pump are

[0007] 1. in order to ensure that the valve cover with large diameter is replaced in the drilling pump with large diameter, the larger the diameter of the valve cover is, the greater the pressure of mud is borne.

[0008] 2. drilling pump belongs to long-term continuous work.

[0009] 3. the pressure fluctuation characteristics in the valve box of drilling pump: in the suction stage of liquid cylinder, the pressure in the valve box is very low, the pressure borne by the valve cover is reduced, in the discharge stage, the pressure in the valve box is very high, the pressure borne by the valve cover is increased, and the valve cover is impacted by alternating load, and the suction valve box is more serious.

[0010] The damage form of the valve cover of the drilling pump is that the threads of the valve cover and the valve box are relatively rotated, the threads of the valve cover and the valve box are screwed, the thread connection has the self-locking function because the friction resistance between the thread pair is enough to prevent relative movement, the friction resistance between the thread pair of the valve cover and the valve box of the drilling pump is reduced when the valve cover and the valve box are always subjected to vibration, impact and variable load and the temperature is high, the connection is gradually loosened when the phenomenon is repeated, the threads of the valve cover and the valve box are loosened, the relative rotation occurs, the work is not normal, and a serious accident is caused, therefore, the anti-loosening problem of the thread connection of the valve cover and the valve box of the drilling pump must be considered in the design. SUMMARY

[0011] The utility model discloses a kind of anti-loosening structures of drilling pump independent valve cover.

[0012] The technical solution of the utility model is as follows:

[0013] The technical solution of the utility model includes valve cover, bolt, anti-loosening washer, anti-loosening clamp, first eccentric wheel, valve box, valve box and valve cover coupling thread axis, second eccentric wheel, valve cover outer thread, anti-loosening face, anti-loosening face symmetry face, valve cover loosening direction, anti-loosening clamp anti-loosening plane, prevent anti-loosening clamp tangential direction movement plane, prevent anti-loosening clamp normal direction movement plane, anti-loosening clamp waist hole, anti-loosening clamp bottom plane, anti-loosening clamp upper plane, anti-loosening clamp left plane, first eccentric wheel outer circle, first eccentric wheel inner circle, first eccentric wheel bottom plane, first eccentric wheel upper plane, valve box inner thread, valve box upper plane, valve box installs anti-loosening clamp inner screw hole, valve box installs second eccentric wheel inner screw hole, valve box installs first eccentric wheel inner screw hole, second eccentric wheel outer circle, second eccentric wheel inner circle, second eccentric wheel bottom plane, second eccentric wheel upper plane, anti-loosening face width, anti-loosening clamp anti-loosening plane width, anti-loosening clamp waist hole width;Its characterized in that:

[0014] Bolt passes through anti-loosening washer, anti-loosening clamp waist hole and is coupled together with valve box installation anti-loosening clamp inner screw hole, and anti-loosening clamp bottom plane and valve box upper plane are fastened together.

[0015] Bolt passes through anti-loosening washer, first eccentric wheel inner circle and is coupled together with valve box installation first eccentric wheel inner screw hole, and first eccentric wheel bottom plane and valve box upper plane are fastened together.

[0016] Bolt passes through anti-loosening washer, second eccentric wheel inner circle and is coupled together with valve box installation second eccentric wheel inner screw hole, and second eccentric wheel bottom plane and valve box upper plane are fastened together.

[0017] The width of the anti-loose clamping hole is 0-0.04mm, the inner circle of the first eccentric wheel is 0-0.04mm, and the inner circle of the second eccentric wheel is 0-0.04mm.

[0018] The width of the anti-loose clamping plane is greater than the width of the anti-loose plane.

[0019] The outer thread of the valve cover and the inner thread of the valve box are right-handed threads, and the loosening direction of the valve cover is left-handed when loosened. Regardless of the working position of the valve cover, the anti-loose clamping plane and the anti-loose plane maintain gapless contact, and the anti-loose clamping left plane is always on the left side of the symmetric plane of the anti-loose plane.

[0020] The outer circle of the first eccentric wheel always maintains gapless contact with the anti-loose clamping normal direction movement plane at any working position of the valve cover.

[0021] The outer circle of the second eccentric wheel always maintains gapless contact with the anti-loose clamping tangential direction movement plane at any working position of the valve cover.

[0022] The anti-loose plane is a plane of the regular polygon of the valve cover.

[0023] The anti-loose structure of the independent valve cover of the drilling pump in this embodiment can use the principle of anti-loose clamping for the valve cover, that is, the principle that the outer thread of the valve cover rotates around the valve cover and valve box coupling thread axis in the loosening direction of the valve cover when the inner thread of the valve box rotates in the loosening direction of the valve cover. When any anti-loose plane of the regular polygon of the valve cover rotates around the valve cover and valve box coupling thread axis in the loosening direction of the valve cover, the anti-loose plane also rotates around the valve cover and valve box coupling thread axis in the loosening direction of the valve cover. Since the distance between the anti-loose plane and the valve cover and valve box coupling thread axis is not equal, the distance between the symmetric plane of the anti-loose plane and the valve cover and valve box coupling thread axis is the shortest. The outer thread of the valve cover and the inner thread of the valve box are right-handed threads, and the loosening direction of the valve cover is left-handed when loosened. Regardless of the working position of the valve cover, the anti-loose clamping left plane is always on the left side of the symmetric plane of the anti-loose plane. The distance between each part of the anti-loose plane on the left side of the symmetric plane of the anti-loose plane and the valve cover coupling thread axis is longer than the distance between the symmetric plane of the anti-loose plane and the valve cover coupling thread axis. As long as the anti-loose clamping anti-loose plane can tightly contact the anti-loose plane on the left side of the symmetric plane of the anti-loose plane, it can limit the distance between each part of the anti-loose plane on the left side of the symmetric plane of the anti-loose plane and the valve cover coupling thread axis from increasing, thereby preventing the anti-loose plane from rotating around the valve cover and valve box coupling thread axis in the loosening direction of the valve cover, and achieving the purpose of preventing the outer thread of the valve cover from rotating around the valve cover and valve box coupling thread axis in the loosening direction of the valve cover.

[0024] When the anti-loose washer is pressed tightly by the bolt and the anti-loose washer, the first eccentric wheel and the second eccentric wheel are pressed tightly by the bolt and the anti-loose washer, and the friction force generated by the pressing force of the bolt is used, and the outer thread of the valve cover and the inner thread of the valve box are right-hand threads, and the loosening direction of the valve cover is left-hand when loosening, and the anti-loose plane of the anti-loose washer and the anti-loose surface keep gapless contact at any working position of the valve cover, the left plane of the anti-loose washer is always on the left side of the symmetric surface of the anti-loose surface, the anti-loose principle of the anti-loose washer is met, and the valve cover is prevented from rotating in the loosening direction of the valve cover around the connection thread axis of the valve box and the valve cover.

[0025] The width of the waist-shaped hole of the anti-loose washer and the large pitch gap of the bolt is 0-0.04mm, the inner circle of the first eccentric wheel and the large pitch gap of the bolt are 0-0.04mm, and the inner circle of the second eccentric wheel and the large pitch gap of the bolt are 0-0.04mm, the distance between the outer circle of the first eccentric wheel and the inner circle of the first eccentric wheel can be adjusted, the distance between the outer circle of the second eccentric wheel and the inner circle of the first eccentric wheel can be adjusted, and the outer circle of the first eccentric wheel and the anti-loose washer can be easily adjusted to gapless contact with the anti-loose washer in the normal direction, and the outer circle of the second eccentric wheel and the anti-loose washer can be easily adjusted to gapless contact with the anti-loose washer in the tangential direction; when the position of the eccentric wheel is adjusted in place, the first eccentric wheel and the second eccentric wheel are pressed tightly by the bolt and the anti-loose washer, not only the friction force generated by the pressing force of the bolt is used, but also the large pitch of the bolt is used to prevent the inner circle of the first eccentric wheel and the inner circle of the second eccentric wheel from retreating, and the resistance is several times larger than the friction force, so that the outer circle of the first eccentric wheel is always in gapless contact with the anti-loose washer in the normal direction at any working position of the valve cover. The outer circle of the second eccentric wheel is always in gapless contact with the anti-loose washer in the tangential direction at any working position of the valve cover, so as to more reliably ensure that the outer thread of the valve cover and the inner thread of the valve box are right-hand threads, the loosening direction of the valve cover is left-hand when loosening, the anti-loose plane of the anti-loose washer and the anti-loose surface keep gapless contact at any working position of the valve cover, the left plane of the anti-loose washer is always on the left side of the symmetric surface of the anti-loose surface, the anti-loose principle of the anti-loose washer is met, and the valve cover is prevented from rotating in the loosening direction of the valve cover around the connection thread axis of the valve box and the valve cover.

[0026] The utility model discloses the content, only need to do a simple anti-loose washer and 2 eccentric wheels, process 3 inner screw holes on the valve box, purchase standard parts screw, anti-loose washer, utilize the anti-loose surface of the regular polygon on the valve cover, can solve the anti-loose technical problem of the threaded connection of the valve cover and the valve box of the drilling pump, and the structure is simple, and the cost is low, and the anti-loose performance is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Exploded view of the anti-loose structure of the independent valve cover of a drilling pump;

[0028] Figure 2 Front view of the valve cover and A-A sectional view;

[0029] Figure 3 Front view of the anti-loose clamp and A-A sectional view;

[0030] Figure 4 Front view of the eccentric and A-A sectional view;

[0031] Figure 5 Side view of the valve box;

[0032] Figure 6 Anti-loose principle diagram of the anti-loose clamp;

[0033] Figure 7 Front view and top view partial enlarged view of any anti-loose surface of the valve cover in the initial anti-loose position contacting the anti-loose clamp;

[0034] Figure 8 Figure 7 D-D, E-E sectional view and corresponding G, H partial enlarged view of the anti-loose clamp;

[0035] Figure 9 Front view and top view partial enlarged view of any anti-loose surface of the valve cover in the final anti-loose position contacting the anti-loose clamp;

[0036] Figure 10 Figure 9 D-D, E-E sectional view and corresponding G, H partial enlarged view of the anti-loose clamp;

[0037] ​​1 - bonnet, 2 - bolt, 3 - lock washer, 4 - lock clip, 5 - first eccentric, 6 - valve box, 7 - valve box and bonnet coupling screw axis, 8 - second eccentric, 1.1 - bonnet external thread, 1.2 - lock face, 1.3 - lock face symmetry plane, 1.4 - bonnet loosening direction, 4.1 - lock clip lock plane, 4.2 - lock clip tangential direction movement prevention plane, 4.3 - lock clip normal direction movement prevention plane, 4.4 - lock clip waist hole, 4.5 - lock clip bottom plane, 4.6 - lock clip upper plane, 4.7 - lock clip left plane, 5.1 - first eccentric external circle, 5.2 - first eccentric internal circle, 5.3 - first eccentric bottom plane, 5.4 - first eccentric upper plane, 6.1 - valve box internal thread, 6.2 - valve box upper plane, 6.3 - valve box lock clip internal screw hole, 6.4 - valve box second eccentric internal screw hole, 6.5 - valve box first eccentric internal screw hole, 8.1 - second eccentric external circle, 8.2 - second eccentric internal circle, 8.3 - second eccentric bottom plane, 8.4 - second eccentric upper plane, H - lock face width, B - lock clip lock plane width, C - lock clip waist hole width. DETAILED DESCRIPTION

[0038] The utility model makes further explanation in combination with the drawings and specific implementation.

[0039] The implementation of the utility model is not limited to the following examples, and various changes made without departing from the purpose of the utility model are within the scope of protection of the utility model.

[0040] Please refer to Figures 1-6 , the embodiment of the utility model discloses a kind of independent valve bonnet of well pump anti-loose structure, including bonnet 1, bolt 2, lock washer 3, lock clip 4, first eccentric 5, valve box 6, valve box and bonnet coupling screw axis 7, second eccentric 8, bonnet external thread 1.1, lock face 1.2, lock face symmetry plane 1.3, bonnet loosening direction 1.4, lock clip lock plane 4.1, lock clip tangential direction movement prevention plane 4.2, lock clip normal direction movement prevention plane 4.3, lock clip waist hole 4.4, lock clip bottom plane 4.5, lock clip upper plane 4.6, lock clip left plane 4.7, first eccentric external circle 5.1, first eccentric internal circle 5.2, first eccentric bottom plane 5.3, first eccentric upper plane 5.4, valve box internal thread 6.1, valve box upper plane 6.2, valve box lock clip internal screw hole 6.3, valve box second eccentric internal screw hole 6.4, valve box first eccentric internal screw hole 6.5, second eccentric external circle 8.1, second eccentric internal circle 8.2, second eccentric bottom plane 8.3, second eccentric upper plane 8.4, lock face width H, lock clip lock plane width B, lock clip waist hole width C;It is characterized that:

[0041] Bolt 2 passes through lock washer 3, lock washer waist hole 4.4 and is coupled with valve box installation lock washer inner hole 6.3, lock washer bottom plane 4.5 is fastened with valve box upper plane 6.2.

[0042] Bolt 2 passes through lock washer 3, first eccentric inner circle 5.2 and is coupled with valve box installation first eccentric inner hole 6.5, first eccentric bottom plane 5.3 is fastened with valve box upper plane 6.2.

[0043] Bolt 2 passes through lock washer 3, second eccentric inner circle 8.2 and is coupled with valve box installation second eccentric inner hole 6.4, second eccentric bottom plane 8.3 is fastened with valve box upper plane 6.2.

[0044] Lock washer waist hole width C and bolt 2 large clearance is 0-0.04mm, first eccentric inner circle 5.2 and bolt 2 large clearance is 0-0.04mm, second eccentric inner circle 8.2 and bolt 2 large clearance is 0-0.04mm.

[0045] Lock washer lock plane width B is greater than lock washer face width H.

[0046] Valve cover outer thread 1.1 and valve box inner thread 6.1 are right-handed threads, when loose, valve cover loosening direction 1.4 is left-handed, no matter the working position of valve cover 1, lock washer lock plane 4.1 and lock washer face 1.2 keep no gap contact, lock washer left plane 4.7 is always on the left side of lock washer face symmetry plane 1.3.

[0047] First eccentric outer circle 5.1 is always in no gap contact with lock washer normal direction movement plane 4.3 at any working position of valve cover 1.

[0048] Second eccentric outer circle 8.1 is always in no gap contact with lock washer tangential direction movement plane 4.2 at any working position of valve cover 1.

[0049] Lock washer face 1.2 is a plane of valve cover 1 regular polygon.

[0050] The anti-loose structure of the independent valve cover of the drilling pump of the embodiment can use the anti-loose principle of lock washer 4 on valve cover 1, that is, the principle of valve cover outer thread 1.1 rotating around valve box and valve cover coupling thread axis 7 relative to valve box inner thread 6.1 in valve cover loosening direction 1.4, see Figure 6As shown, when the valve cover outer thread 1.1 rotates in the valve cover loosening direction 1.4 relative to the valve box inner thread 6.1 around the valve box and valve cover coupling thread axis 7, the valve cover loosening surface 1.2 also rotates in the valve cover loosening direction 1.4 around the valve box and valve cover coupling thread axis 7. Since the distance from each part of the valve cover loosening surface 1.2 to the valve box and valve cover coupling thread axis 7 is not equal, the distance from the valve cover loosening surface symmetry surface 1.3 to the valve box and valve cover coupling thread axis 7 is the shortest. The valve cover outer thread 1.1 and the valve box inner thread 6.1 are right-handed threads, and when loosening, the valve cover loosening direction 1.4 is left-handed. Regardless of the working position of the valve cover 1, the anti-loosening clamp left plane 4.7 is always on the left side of the valve cover loosening surface symmetry surface 1.3, and the distance from each part of the valve cover loosening surface 1.2 on the left side of the valve cover loosening surface symmetry surface 1.3 to the valve cover coupling thread axis 7 is longer than the distance from the valve cover loosening surface symmetry surface 1.3 to the valve cover coupling thread axis 7. As long as the anti-loosening clamp valve cover loosening surface 4.1 can tightly contact the valve cover loosening surface 1.2 on the left side of the valve cover loosening surface symmetry surface 1.3, it can limit the distance from each part of the valve cover loosening surface 1.2 on the left side of the valve cover loosening surface symmetry surface 1.3 to the valve cover coupling thread axis 7 from increasing, thereby preventing the valve cover loosening surface 1.2 from rotating in the valve cover loosening direction 1.4 around the valve box and valve cover coupling thread axis 7, and achieving the purpose of preventing the valve cover outer thread 1.1 from rotating in the valve cover loosening direction 1.4 relative to the valve box inner thread 6.1 around the valve box and valve cover coupling thread axis 7.

[0051] Please refer to Figure 7 and Figure 9 , Figure 7 is a front view and top view partial enlarged view of any one valve cover loosening surface contacting the anti-loosening clamp initial loosening position, Figure 9 is a front view and top view partial enlarged view of any one valve cover loosening surface contacting the anti-loosening clamp final loosening position. Since the anti-loosening clamp has a waist-shaped hole 4.4, before being pressed by the bolt 2 and the anti-loosening washer 3, the anti-loosening clamp 4 can rotate and move around the bolt 2. Since the width B of the anti-loosening clamp valve cover loosening surface is greater than the width H of the valve cover loosening surface, and since the valve cover loosening surface 1.2 is a plane of the regular polygon of the valve cover 1; after the anti-loosening clamp position is adjusted in place, the anti-loosening clamp 4 is pressed by the bolt 2 and the anti-loosening washer 3. In the first stage, the friction force generated by the pressing force of the bolt 2 causes the valve cover outer thread 1.1 and the valve box inner thread 6.1 to be right-handed threads, and when loosening, the valve cover loosening direction 1.4 is left-handed. Regardless of the working position of the valve cover 1, the anti-loosening clamp valve cover loosening surface 4.1 and the valve cover loosening surface 1.2 maintain gapless contact, and the anti-loosening clamp left plane 4.7 is always on the left side of the valve cover loosening surface symmetry surface 1.3, satisfying Figure 6 the anti-loosening clamp valve cover loosening principle, thereby achieving the purpose of preventing the valve cover outer thread 1.1 from rotating in the valve cover loosening direction 1.4 relative to the valve box inner thread 6.1 around the valve box and valve cover coupling thread axis 7.

[0052] Please refer to Figure 8 andFigure 10 , Figure 8 Figure 7 D-D, E-E sectional view and corresponding G, H local enlarged view of Figure 10 is Figure 9 D-D, E-E sectional view and corresponding G, H local enlarged view of. Because the width C of the anti-loose and clamping hole and the large pitch clearance of the bolt 2 is 0-0.04mm, the large pitch clearance between the inner circle 5.2 of the first eccentric wheel and the bolt 2 is 0-0.04mm, the large pitch clearance between the inner circle 8.2 of the second eccentric wheel and the bolt 2 is 0-0.04mm, because the distance between the outer circle 5.1 of the first eccentric wheel and the inner circle 5.2 of the first eccentric wheel can be adjusted, the distance between the outer circle 8.1 of the second eccentric wheel and the inner circle 5.2 of the first eccentric wheel can be adjusted, the outer circle 5.1 of the first eccentric wheel and the anti-loose and clamping moving plane 4.3 in the normal direction can be easily adjusted to have no clearance contact, the outer circle 8.1 of the second eccentric wheel and the anti-loose and clamping moving plane 4.2 in the tangential direction can be easily adjusted to have no clearance contact; after the position of the eccentric wheel is adjusted, the first eccentric wheel 5 and the second eccentric wheel 8 are pressed by the bolt 2 and the anti-loose washer 3, not only the friction force generated by the pressing force of the bolt 2, but more importantly, the large pitch of the bolt 2 prevents the inner circle 5.2 of the first eccentric wheel and the inner circle 8.2 of the second eccentric wheel from retreating, and the resistance is several times larger than the friction force, so the outer circle 5.1 of the first eccentric wheel is always in no clearance contact with the anti-loose and clamping moving plane 4.3 in the normal direction at any working position of the valve cover 1. The outer circle 8.1 of the second eccentric wheel is always in no clearance contact with the anti-loose and clamping moving plane 4.2 in the tangential direction at any working position of the valve cover 1, thereby more reliably ensuring that the outer thread 1.1 of the valve cover and the inner thread 6.1 of the valve box are right-handed threads, the loosening direction 1.4 of the valve cover is left-handed when loosened, the anti-loose and clamping anti-loose plane 4.1 and the anti-loose surface 1.2 are kept in no clearance contact at any working position of the valve cover 1, the anti-loose and clamping left plane 4.7 is always on the left side of the anti-loose surface symmetry plane 1.3, and the anti-loose and clamping anti-loose principle is met, thereby preventing the outer thread 1.1 of the valve cover from rotating around the valve box and the valve cover coupling thread axis 7 in the loosening direction 1.4 of the valve cover. Figure 6

[0053] By adopting the embodiment, only a simple anti-loose and clamping and two eccentric wheels are needed, three inner screw holes are machined on the valve box, standard screws and anti-loose washers are purchased, and the anti-loose surface 1.2 of any one of the regular polygons on the valve cover can be used to solve the anti-loose technical problem of the threaded coupling of the valve cover and the valve box of the drilling pump, the structure is simple, the cost is low, and the anti-loose performance is safe and reliable.

[0054] ​The utility model discloses a kind of, the detailed description of the implementation is made, but the utility model is not limited to the above embodiment, within the knowledge scope possessed by the ordinary skill in the art, various changes can also be made, these changes are all the protection of the utility model, also belong to the protection scope of the utility model.

Claims

1. A loosening-preventing structure of a valve cover of a drilling pump, comprising a valve cover (1), a bolt (2), a loosening-preventing washer (3), a loosening-preventing clamp (4), a first eccentric wheel (5), a valve box (6), a second eccentric wheel (8), an outer thread of the valve cover (1.1), a loosening-preventing surface (1.2), a symmetric surface of the loosening-preventing surface (1.3), a loosening direction of the valve cover (1.4), a loosening-preventing surface of the loosening-preventing clamp (4.1), a tangential direction movement-preventing surface of the loosening-preventing clamp (4.2), a normal direction movement-preventing surface of the loosening-preventing clamp (4.3), a waist hole of the loosening-preventing clamp (4.4), a bottom surface of the loosening-preventing clamp (4.5), an upper surface of the loosening-preventing clamp (4.6), a left surface of the loosening-preventing clamp (4.7), an outer circle of the first eccentric wheel (5.1), an inner circle of the first eccentric wheel (5.2), a bottom surface of the first eccentric wheel (5.3), an upper surface of the first eccentric wheel (5.4), an inner thread of the valve box (6.1), an upper surface of the valve box (6.2), an inner screw hole of the valve box for mounting the loosening-preventing clamp (6.3), an inner screw hole of the valve box for mounting the second eccentric wheel (6.4), an inner screw hole of the valve box for mounting the first eccentric wheel (6.5), an outer circle of the second eccentric wheel (8.1), an inner circle of the second eccentric wheel (8.2), a bottom surface of the second eccentric wheel (8.3), an upper surface of the second eccentric wheel (8.4), a width of the loosening-preventing surface (H), a width of the loosening-preventing surface of the loosening-preventing clamp (B), and a width of the waist hole of the loosening-preventing clamp (C), characterized in that: the bolt (2) passes through the loosening-preventing washer (3) and the waist hole of the loosening-preventing clamp (4.4) and is connected with the inner screw hole of the valve box for mounting the loosening-preventing clamp (6.3), so as to fasten the bottom surface of the loosening-preventing clamp (4.5) and the upper surface of the valve box (6.2) together; the bolt (2) passes through the loosening-preventing washer (3) and the inner circle of the first eccentric wheel (5.2) and is connected with the inner screw hole of the valve box for mounting the first eccentric wheel (6.4), so as to fasten the bottom surface of the first eccentric wheel (5.3) and the upper surface of the valve box (6.2) together; the bolt (2) passes through the loosening-preventing washer (3) and the inner circle of the second eccentric wheel (8.2) and is connected with the inner screw hole of the valve box for mounting the second eccentric wheel (6.5), so as to fasten the bottom surface of the second eccentric wheel (8.3) and the upper surface of the valve box (6.2) together; the width of the loosening-preventing surface of the loosening-preventing clamp (B) is greater than the width of the loosening-preventing surface (H); the outer thread of the valve cover (1.1) and the inner thread of the valve box (6.1) are right-handed threads, the loosening direction of the valve cover (1.4) is left-handed when loosened, and no matter what working position the valve cover (1) is in, the loosening-preventing surface of the loosening-preventing clamp (4.1) and the loosening-preventing surface (1.2) keep no-gap contact, and the left surface of the loosening-preventing clamp (4.7) is always on the left side of the symmetric surface of the loosening-preventing surface (1.3); the outer circle of the first eccentric wheel (5.1) always keeps no-gap contact with the normal direction movement-preventing surface of the loosening-preventing clamp (4.3) when the valve cover (1) is in any working position; and the outer circle of the second eccentric wheel (8.1) always keeps no-gap contact with the tangential direction movement-preventing surface of the loosening-preventing clamp (4.2) when the valve cover (1) is in any working position. ​ ​ ​ ​ ​ ​ ​ 2. The anti-loosening structure of the independent valve cover of the drilling pump according to claim 1, characterized in that The width (C) of the anti-loose waist type hole and the big pitch clearance of the bolt (2) is 0-0.04mm, the inner circle (5.2) of the first eccentric wheel and the big pitch clearance of the bolt (2) is 0-0.04mm, and the inner circle (8.2) of the second eccentric wheel and the big pitch clearance of the bolt (2) is 0-0.04mm.

3. The anti-loosening structure of the independent valve cover of the drilling pump according to claim 1, characterized in that The anti-loose surface (1.2) is a plane of the regular polygon of the valve cover (1).

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