High-sealing-performance anti-loose valve cover of drilling pump and mounting method thereof

Abstract

The high-sealing-performance anti-loosening valve cover comprises a hydraulic cylinder body, a valve port is formed in the surface of the hydraulic cylinder body and is a stepped hole, the section, with the large inner diameter, of the valve port is in threaded connection with the valve cover, a limiting disc is fixedly connected to the outer wall above the threaded section of the valve cover, and a plurality of limiting holes are formed in the limiting disc; a locking base is fixed to the top end of the hydraulic cylinder body through bolts, a groove is formed in the side face of the locking base, the limiting disc is clamped in the groove, a fixing hole is formed in the top face of the locking base, the fixing hole is communicated with the groove, meanwhile, the fixing hole and the limiting holes are located on the same straight line, and a fixing pin shaft penetrates through the fixing hole. And the fixing pin shaft penetrates through the limiting hole. By means of a mechanical anti-loosening structure composed of the locking base and the fixing pin shaft, the problem that a valve cover of a drilling pump is loosened due to strong vibration is solved, a spherical surface structure is arranged, the plug is kept in a good centering state, and the sealing performance is enhanced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas drilling equipment, and relates to a high-sealing anti-loose valve cover of a drilling pump, and also relates to a mounting method of the high-sealing anti-loose valve cover of the drilling pump. BACKGROUND

[0002] In the process of oil exploitation, the drilling pump is a kind of equipment for conveying circulating high-pressure drilling fluid to the bottom of the well, which is mainly used for flushing the bottom of the well, breaking rocks, cooling and lubricating the drill bit, and carrying the cuttings back to the ground, and is the core equipment of drilling operation. The fluid end directly contacts the mud liquid and pressurizes and transmits it, so the inner cavity of the liquid cylinder is filled with high-pressure mud for a long time. In order to ensure the efficient pumping of the mud liquid, the sealing work of the fluid end must be done well.

[0003] The valve cover is installed on the inner hole of the liquid cylinder in the liquid cylinder of the drilling pump, which provides a guide channel for the opening and closing of the pump valve. At the same time, the inner hole needs to be sealed during the normal operation process to prevent the leakage of mud liquid. This place continuously bears the alternating load of fluid pressure, the working condition is complex, and sealing failure problems are easy to occur. Moreover, the valve cover and the liquid cylinder are connected by threads, and the fluid end vibrates obviously due to the fluid pulse. The probability of thread loosening between the valve cover and the liquid cylinder is high, which will also cause the consequences of sealing failure. If the sealing failure leads to valve cover leakage or high-pressure mud liquid spouting, it will cause great economic loss and time cost. Therefore, sealing treatment needs to be carried out at the valve cover.

[0004] In the prior art, the sealing method commonly used at the valve cover of the drilling pump is to use an O-ring or a rectangular sealing ring with good material performance for sealing. This can ensure the sealing property when the vibration of the fluid end is not obvious. At the same time, the valve cover is connected by trapezoidal threads, and small pitch design is also adopted to improve the anti-loose property. This improves the sealing performance to some extent, but when strong vibration phenomenon occurs in the fluid end of the drilling pump, the valve cover still has a high risk of loosening, which easily leads to sealing failure and causes unnecessary loss. SUMMARY

[0005] The purpose of the present application is to provide a high-sealing anti-loose valve cover of a drilling pump, which solves the problem that the connection between the valve cover and the valve body is easy to loosen when strong vibration phenomenon occurs in the fluid end of the drilling pump in the prior art, leading to sealing failure.

[0006] Another purpose of the present application is to provide a mounting method of the high-sealing anti-loose valve cover of the drilling pump.

[0007] The technical solution adopted in this invention includes a hydraulic cylinder body, a valve port with a stepped hole on the surface of the hydraulic cylinder body, a valve cover with a threaded connection to the larger inner diameter section of the valve port, a limit plate fixedly connected to the outer wall above the threaded section of the valve cover, a number of limit holes with the limit plate having the axis of the limit holes parallel to the axis of the valve cover, a locking base fixed to the top of the hydraulic cylinder body with bolts, a groove with a groove on the side of the locking base, the limit plate being engaged in the groove, a fixing hole with a fixing hole on the top surface of the locking base, the fixing hole communicating with the groove, and the fixing hole and the limit hole being on the same straight line, a fixing pin passing through the fixing hole and the fixing pin passing through the limit hole.

[0008] The invention is further characterized by: The valve cover is a barrel shape with the opening facing upwards. There are four round holes on the outer wall of the valve cover above the limiting plate, and the axes of adjacent round holes are perpendicular to each other. The valve cover is connected to the cylinder body of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover is a convex spherical surface.

[0009] A plug is fitted and abutted against the bottom of the valve cover. Several sealing rings are provided between the plug and the inner wall of the valve port. The sealing rings are rectangular.

[0010] The plug is T-shaped, and its top radius is larger than the minimum radius of the valve port.

[0011] The side of the locking base has a lead screw hole along the long direction of the groove, and the lead screw hole is connected to the fixing hole. A limit screw is installed in the lead screw hole.

[0012] Both sides of the groove are provided with lead screw holes, and the extension direction of the lead screw holes from the locking base to the fixing hole is opposite to the rotation direction when the valve cover is screwed out of the valve port.

[0013] A set of protective plate bases is fixedly attached to the top of the locking base on both sides of the fixing hole. Each set of protective plate bases consists of two oppositely arranged fixing blocks. A protective pin passes through the two fixing blocks of each set of protective plate bases. A protective plate is fixedly connected between the two sets of protective plate bases through the protective pin. A pin is inserted into one end of the protective pin.

[0014] The fixing hole is a racetrack-shaped through hole, and the length of the fixing hole is not less than the farthest distance between the outer edges of two adjacent limiting holes.

[0015] Another technical solution adopted in this invention is the above-mentioned method for installing the anti-loosening valve cover, which is implemented according to the following steps: Step 1: Press several sealing rings into the valve port, then fit a single sealing ring onto the outside of the cylinder in the middle of the plug, and insert the plug into the valve port; Step 2: Manually screw the valve cover into the valve port, then insert the lever into the two symmetrical round holes on the valve cover, and rotate the lever around the valve cover until the valve cover can no longer be rotated; Step 3: Secure the locking base to the outside of the limiting plate using the groove, and then fix the locking base to the cylinder body using bolts; Step 4: Remove the pin on one side of the protective pin and pull the protective pin out of the base of the protective plate. Use the other side of the protective pin as the pivot to open the protective plate. Then rotate the limit screw to make it exit from the fixing hole. Step 5: Insert the fixing pin through the fixing hole into the limiting hole, and then screw the limiting screw into the fixing hole until the limiting screw is in close contact with the fixing pin. Step 6: Close the protective plate, insert the removed protective pin into the base of the protective plate, and secure it with the pin.

[0016] The beneficial effects of this invention are: This invention discloses a high-sealing anti-loosening valve cover device for drilling pumps. The invention employs a forced mechanical anti-loosening structure, which restricts the rotation of the valve cover through the cooperation of a locking base, a limiting disc, and a fixing pin, thereby preventing valve cover loosening due to vibration. Simultaneously, a spherical surface structure and two rectangular sealing rings ensure the alignment between the valve port and the plug, maintaining good alignment of the plug, enhancing sealing performance, and effectively guaranteeing stable operation of the hydraulic end, thereby improving the overall performance of the drilling pump. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the high-sealing anti-loosening valve cover for the drilling pump of the present invention; Figure 2 This is a schematic diagram of the fixing structure of the fixing pin in this invention; Figure 3 This is a schematic cross-sectional view of the valve cover and plug in this invention; Figure 4 This is a schematic diagram of the locking base structure in this invention; Figure 5 This is a structural schematic diagram of the protective plate and its fixing components in this invention.

[0018] In the diagram: 1. Cylinder body; 2. Valve port; 3. Valve cover; 4. Limiting plate; 5. Limiting hole; 6. Locking base; 7. Groove; 8. Fixing hole; 9. Fixing pin; 10. Round hole; 11. Plug; 12. Sealing ring; 13. Lead screw hole; 14. Limiting lead screw; 15. Protective plate base; 16. Protective pin; 17. Protective plate; 18. Pin. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] The high-sealing anti-loosening valve cover for drilling pumps provided by the present invention includes a cylinder body 1, a valve port 2 with a stepped hole on the surface of the cylinder body 1, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a plurality of limiting holes 5 with the limiting holes 5 having an axis parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 by bolts, a groove 7 with a groove on the side of the locking base 6, the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with a top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0021] The valve cover 3 is a barrel shape with the opening facing upward. The valve cover 3 has four round holes 10 on the outer wall above the limiting plate 4, and the axes of adjacent round holes 10 are perpendicular to each other. The valve cover 3 is connected to the cylinder body 1 of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover 3 is an outwardly convex spherical surface.

[0022] A plug 11 is fitted and abutted against the bottom of the valve cover 3. Several sealing rings 12 are provided between the plug 11 and the inner wall of the valve port 2. The sealing rings 12 are rectangular sealing rings.

[0023] The plug 11 is T-shaped, and its top radius is larger than the minimum radius of the valve port 2.

[0024] The side of the locking base 6 is provided with a lead screw hole 13 along the long direction of the groove 7, and the lead screw hole 13 is connected to the fixing hole 8. A limit screw 14 is provided in the lead screw hole 13.

[0025] Both sides of the groove 7 are provided with lead screw holes 13. The extension direction of the lead screw holes 13 from the locking base 6 to the fixing hole 8 is opposite to the rotation direction when the valve cover 3 is screwed out of the valve port 2.

[0026] A set of protective plate bases 15 are fixedly attached to the top of the locking base 6 on both sides of the fixing hole 8. Each set of protective plate bases 15 consists of two oppositely arranged fixing blocks. A protective pin 16 passes through the two fixing blocks of each set of protective plate bases 15. A protective plate 17 is fixedly connected between the two sets of protective plate bases 15 through the protective pin 16. A pin 18 is inserted into one end of the protective pin 16.

[0027] The fixing hole 8 is a racetrack-shaped through hole, and the length of the fixing hole 8 is not less than the farthest distance between the outer edges of the two adjacent limiting holes 5.

[0028] This invention effectively solves the problem of valve cover loosening under high pressure or vibration environments through a mechanical locking mechanism. Specifically, the mechanism locks the valve cover 3 by locking the base 6 and its fixing pin 9 through pre-drilled fixing holes 8 and limiting holes 5, and prevents minor displacement of the valve cover 3 by limiting screw 14, thus achieving forced mechanical anti-loosening of the valve cover 3. This greatly limits the possibility of valve cover 3 rotating, fundamentally eliminating the sealing failure caused by valve cover 3 loosening, and improving the reliability and safety of the system.

[0029] Furthermore, this invention also incorporates a spherical fit structure between the bottom surface of the valve cover 3 and the top surface of the plug 11. This ensures that the axes of the valve cover 3 and the plug 11 are always aligned, thereby improving the overall alignment accuracy of the device. During actual operation, when the valve cover 3 needs to be installed onto the valve port 2, the spherical fit automatically adjusts the deviation between the valve cover 3 and the valve port 2, ensuring that the plug 11 is always in the optimal position. This prevents large gaps between the plug 11 and the inner wall of the valve port 2 due to improper installation, which could affect the device's sealing performance.

[0030] Example 1: like Figure 1 , Figure 2 and Figure 3 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0031] The valve cover 3 is connected to the locking base 6 by inserting the fixing pin 9 into the limiting hole 5 that coincides with the fixing hole 8. Since the locking base 6 is fixed on the cylinder body 1, the rotation of the valve cover 3 is restricted, and it can only rotate within the length range of the fixing hole 8. By restricting the rotation of the valve cover 3, the sealing failure caused by the valve cover 3 loosening when strong vibration occurs at the hydraulic end of the drilling pump is prevented.

[0032] Example 2: Based on Example 1, some structures are added as follows: like Figure 1 , Figure 2 and Figure 3As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0033] The valve cover 3 is a barrel shape with the opening facing upward. The valve cover 3 has four round holes 10 on the outer wall above the limiting plate 4, and the axes of adjacent round holes 10 are perpendicular to each other. The valve cover 3 is connected to the cylinder body 1 of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover 3 is an outwardly convex spherical surface.

[0034] The round holes 10 are opened on the side of the valve cover 3 exposed outside the cylinder body 1, and the plane where the four round holes 10 are located is perpendicular to the axis of the valve cover 3. When the valve cover is installed, the round holes 10 can be used to fasten the valve cover 3. By inserting rod-shaped tools such as steel bars into a symmetrical set of round holes 10, the valve cover 3 can be tightened with the valve cover as the center using the lever principle, which reduces the installation difficulty of the valve cover 3 and improves the installation efficiency of the valve cover 3. At the same time, tightening the valve cover 3 with the lever principle can apply a larger preload to the valve cover 3 with a smaller force, preventing the valve cover 3 from loosening.

[0035] Example 3: Based on Example 2, some structures are added as follows: like Figure 1 , Figure 2 and Figure 3 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0036] The valve cover 3 is a barrel shape with the opening facing upward. The valve cover 3 has four round holes 10 on the outer wall above the limiting plate 4, and the axes of adjacent round holes 10 are perpendicular to each other. The valve cover 3 is connected to the cylinder body 1 of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover 3 is an outwardly convex spherical surface.

[0037] A plug 11 is fitted and abutted against the bottom of the valve cover 3. Several sealing rings 12 are provided between the plug 11 and the inner wall of the valve port 2. The sealing rings 12 are rectangular sealing rings.

[0038] The convex spherical surface of the bottom of the valve cover 3 mates with the top of the plug 11, keeping the plug 11 in a centered state. Its axis is on the same straight line as the axis of the valve port 2, preventing the plug 11 from tilting to the inner wall of the valve port 2 during installation and operation, thus avoiding large gaps that could affect the sealing performance of the device.

[0039] The sealing ring 12 is a rectangular sealing ring to adapt to the high-pressure environment of the hydraulic end of the drilling pump. At the same time, multiple sealing rings 12 form a multi-seal structure, which enhances the sealing effect and avoids the failure of a single sealing ring 12 during operation from affecting the overall sealing performance.

[0040] Example 4: Based on Example 3, some structures are added as follows: like Figure 1 , Figure 2 and Figure 3 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0041] The valve cover 3 is a barrel shape with the opening facing upward. The valve cover 3 has four round holes 10 on the outer wall above the limiting plate 4, and the axes of adjacent round holes 10 are perpendicular to each other. The valve cover 3 is connected to the cylinder body 1 of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover 3 is an outwardly convex spherical surface.

[0042] A plug 11 is fitted and abutted against the bottom of the valve cover 3. Several sealing rings 12 are provided between the plug 11 and the inner wall of the valve port 2. The sealing rings 12 are rectangular sealing rings.

[0043] The plug 11 is T-shaped, and its top radius is larger than the minimum radius of the valve port 2. The sealing ring 12 is fitted onto the bottom of the plug 11.

[0044] The T-shaped design of the plug 11 allows the middle column of the T-shape to be inserted into the smaller diameter section of the valve port 2. At the same time, the platform surface of the plug 11 can be engaged with the step of the valve port 2, restricting the downward movement of the plug 11 and preventing the plug 11 from being squeezed into the cylinder body 1 by the valve cover 3 during the installation process, which would affect the installation process of the device and the operation of the drilling pump.

[0045] Example 5: Based on Example 1, some structures are added as follows: like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0046] The side of the locking base 6 is provided with a lead screw hole 13 along the long direction of the groove 7, and the lead screw hole 13 is connected to the fixing hole 8. A limit screw 14 is provided in the lead screw hole 13.

[0047] In order to ensure that the fixing hole 8 can stably coincide with the limiting hole 5, the fixing hole 8 has a certain length, and the fixing pin 9 can move in it. Therefore, the fixing pin 9 needs to be further limited by the limiting screw 14.

[0048] The limiting screw 14 is screwed into the screw hole 13 in the horizontal direction and abuts against the fixed pin 9, thereby limiting the displacement of the fixed pin 9 in the fixed hole 8, preventing the valve cover 3 from rotating slightly, and avoiding the valve cover 3 from being loosened due to external force during the operation of the device, thus improving the sealing performance of the device.

[0049] Example 6: Based on Example 5, some structures are added as follows: like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0050] The side of the locking base 6 is provided with a lead screw hole 13 along the long direction of the groove 7, and the lead screw hole 13 is connected to the fixing hole 8. A limit screw 14 is provided in the lead screw hole 13.

[0051] Both sides of the groove 7 are provided with lead screw holes 13. The extension direction of the lead screw holes 13 from the locking base 6 to the fixing hole 8 is opposite to the rotation direction when the valve cover 3 is screwed out of the valve port 2. The rotation of the valve cover 3 is further restricted by the limiting lead screw 14.

[0052] Both sides of the groove 7 are provided with lead screw holes 13, and each lead screw hole 13 is provided with a limit screw 14. The two sets of limit screws 14 can fix the two ends of the fixed pin 9 respectively, preventing the fixed pin 9 from tilting under pressure when only one end is in contact with the limit screw 14, causing the valve cover 3 to shift in the predetermined installation position, which would result in the valve cover 3 becoming loose and causing the seal to fail, or the valve cover 3 being installed too tightly, causing the parts to be damaged.

[0053] Example 7: Based on Example 1, some structures are added as follows: like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0054] A set of protective plate bases 15 are fixedly attached to the top of the locking base 6 on both sides of the fixing hole 8. Each set of protective plate bases 15 consists of two oppositely arranged fixing blocks. A protective pin 16 passes through the two fixing blocks of each set of protective plate bases 15. A protective plate 17 is fixedly connected between the two sets of protective plate bases 15 through the protective pin 16. A pin 18 is inserted into one end of the protective pin 16.

[0055] After the fixing pin 9 is fixed by the limiting screw 14, its horizontal movement is restricted. However, the top of the fixing pin 9 is not covered in the vertical direction, which may cause the fixing pin 9 to come out of the fixing hole 8, thus causing the valve cover 3 to fail to lock. Therefore, a guard plate 17 is provided above the fixing hole 8 to prevent the fixing pin 9 from coming out. In order to ensure that the guard plate 17 can be stably fixed on the locking base 6, its movement is restricted by the protective pin 16 and the latch 18 to protect the stable connection of the guard plate 17.

[0056] Example 8: Combining Embodiments 4 and 6, the specific structure is as follows: like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0057] The valve cover 3 is a barrel shape with the opening facing upward. The valve cover 3 has four round holes 10 on the outer wall above the limiting plate 4, and the axes of adjacent round holes 10 are perpendicular to each other. The valve cover 3 is connected to the cylinder body 1 of the hydraulic cylinder through a trapezoidal thread. The lower end face of the valve cover 3 is an outwardly convex spherical surface.

[0058] A plug 11 is fitted and abutted against the bottom of the valve cover 3. Several sealing rings 12 are provided between the plug 11 and the inner wall of the valve port 2. The sealing rings 12 are rectangular sealing rings.

[0059] The plug 11 is T-shaped, and its top radius is larger than the minimum radius of the valve port 2.

[0060] The side of the locking base 6 is provided with a lead screw hole 13 along the long direction of the groove 7, and the lead screw hole 13 is connected to the fixing hole 8. A limit screw 14 is provided in the lead screw hole 13.

[0061] Both sides of the groove 7 are provided with lead screw holes 13. The extension direction of the lead screw holes 13 from the locking base 6 to the fixing hole 8 is opposite to the rotation direction when the valve cover 3 is screwed out of the valve port 2.

[0062] The spherical structure between the bottom surface of the valve cover 3 and the top surface of the plug 11 ensures the centering of the plug 11, preventing large gaps between the plug 11 and the inner wall of the valve port 2, which would affect the sealing performance of the device. At the same time, the cooperation of the locking base 6, the limiting screw 14 and the fixing pin 9 prevents the valve cover 3 from rotating, so that the valve cover 3, the plug 11 and the valve port 2 maintain a stable state and continue to seal.

[0063] Example 9: Based on Example 1, some structures are added as follows: like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the system includes a cylinder body 1, a valve port 2 with a stepped hole on its surface, a valve cover 3 with a threaded connection to the larger inner diameter section of the valve port 2, a limiting plate 4 fixedly connected to the outer wall above the threaded section of the valve cover 3, a number of limiting holes 5 with the limiting plate 4 having a number of limiting holes 5 with the axis of the limiting holes 5 being parallel to the axis of the valve cover 3, a locking base 6 fixed to the top of the cylinder body 1 with bolts, a groove 7 with the side of the locking base 6 with the limiting plate 4 being engaged in the groove 7, a fixing hole 8 with the top surface of the locking base 6 communicating with the groove 7, and the fixing hole 8 being on the same straight line as the limiting holes 5, a fixing pin 9 passing through the fixing hole 8 and passing through the limiting hole 5.

[0064] The fixing hole 8 is a racetrack-shaped through hole, and the length of the fixing hole 8 is not less than the farthest distance between the outer edges of the two adjacent limiting holes 5.

[0065] During the installation of the device, at least one limiting hole 5 needs to coincide with the fixing hole 8. However, in the actual installation process, the screw-in position of the valve cover 3 and the applied pre-tightening force cannot be stably controlled, so it cannot be guaranteed that the fixing hole 8 will stably coincide with the limiting hole 5. Therefore, the length of the fixing hole 8 is limited to ensure that at least two limiting holes 5 coincide with the fixing hole 8, so that the installer can select the appropriate limiting hole 5 to fix the valve cover 3 to accommodate the position deviation during the installation process.

[0066] Installation method: The high-sealing, anti-loosening valve cover for the drilling pump involved in this application shall be installed following these steps: Step 1: Press several sealing rings 12 into the valve port 2, then fit a single sealing ring 12 onto the outside of the cylinder in the middle of the plug 11, and insert the plug 11 into the valve port 2; Step 2: Manually screw the valve cover 3 into the valve port 2, then insert the lever into the two symmetrical round holes 10 on the valve cover 3, rotate the lever with the valve cover 3 as the center, and continue to tighten the valve cover 3 by lever principle until the valve cover 3 and the plug 11 are tightly fitted and cannot be rotated. Step 3: Secure the locking base 6 to the outside of the limiting plate 4 through the groove 7, and then fix the locking base 6 to the cylinder body 1 with bolts; Step 4: Remove the pin 18 on one side of the protective pin 16 and pull the protective pin 16 out of the protective plate base 15. Then, use the other side of the protective pin 16 as the pivot to open the protective plate 17. After that, rotate each limit screw 14 to make the limit screw 14 exit from the fixing hole 8. Step 5: Insert the fixing pin 9 through the fixing hole 8 into the limiting hole 5, and then screw the limiting screw 14 toward the fixing hole 8 until the limiting screw 14 is in close contact with the fixing pin 9. Step 6: Close the protective plate 17, insert the pulled-out protective pin 16 into the protective plate base 15, and fix the protective pin 16 with the pin 18.

[0067] After installation, the locking base 6 is fixed to the cylinder body 1 with bolts. The limiting plate 4 on the valve cover 3 is engaged in the groove 7 on the locking base 6. The fixing hole 8 on the locking base 6 coincides with part of the limiting hole 5 on the limiting plate 4. The fixing pin 9 passes through one of the limiting holes 5, and the limiting screw 14 abuts against the fixing pin 9 in the opposite direction to the rotation direction when the valve cover 3 is turned out of the valve port. At the same time, a protective plate 17 is installed above the fixing hole 8 via a protective plate base 15. The protective plate base 15 and the protective plate 17 are fixed together by a protective pin 16 and a pin 18. The bottom of the valve cover 3 is tightly attached to the plug 11, and a sealing ring 12 is provided between the plug 11 and the inner wall of the valve port 2.

Claims

1. A high-sealing, anti-loosening valve cover for drilling pumps, characterized in that, The cylinder includes a cylinder body (1), on which a valve port (2) is provided. The valve port (2) is a stepped hole. A valve cover (3) is threaded to the larger inner diameter section of the valve port (2). A limiting plate (4) is fixedly connected to the outer wall above the threaded section of the valve cover (3). Several limiting holes (5) are provided on the limiting plate (4). The axis of the limiting holes (5) is parallel to the axis of the valve cover (3). A locking base (6) is fixed to the top of the cylinder body (1) by bolts. A groove (7) is provided on the side of the locking base (6). The limiting plate (4) is engaged in the groove (7). A fixing hole (8) is provided on the top surface of the locking base (6). The fixing hole (8) is connected to the groove (7). At the same time, the fixing hole (8) and the limiting hole (5) are on the same straight line. A fixing pin (9) passes through the fixing hole (8) and passes through the limiting hole (5).

2. The high-sealing anti-loosening valve cover for drilling pumps according to claim 1, characterized in that, The valve cover (3) is a barrel shape with the opening facing upward. The valve cover (3) has four round holes (10) on the outer wall above the limiting plate (4), and the axes of adjacent round holes (10) are perpendicular to each other. The valve cover (3) is connected to the cylinder body (1) of the liquid cylinder through a trapezoidal thread. The lower end face of the valve cover (3) is an outwardly convex spherical surface.

3. The high-sealing anti-loosening valve cover for drilling pumps according to claim 2, characterized in that, A plug (11) is fitted and abutted against the bottom of the valve cover (3). Several sealing rings (12) are provided between the plug (11) and the inner wall of the valve port (2). The sealing rings (12) are rectangular sealing rings.

4. The high-sealing anti-loosening valve cover for drilling pumps according to claim 3, characterized in that, The plug (11) is T-shaped, and its top radius is greater than the minimum radius of the valve port (2).

5. The high-sealing anti-loosening valve cover for drilling pumps according to claim 1, characterized in that, The locking base (6) has a screw hole (13) along the long direction of the groove (7) on its side, and the screw hole (13) is connected to the fixing hole (8). A limit screw (14) is provided in the screw hole (13).

6. The high-sealing anti-loosening valve cover for drilling pumps according to claim 5, characterized in that, Both sides of the groove (7) are provided with screw holes (13). The extension direction of the screw holes (13) from the locking base (6) to the fixing hole (8) is opposite to the rotation direction when the valve cover (3) is screwed out of the valve port (2).

7. The high-sealing anti-loosening valve cover for drilling pumps according to claim 1, characterized in that, The top of the locking base (6) is fixed with a set of protective plate bases (15) on both sides of the fixing hole (8). Each set of protective plate bases (15) consists of two oppositely arranged fixing blocks. A protective pin (16) passes through the two fixing blocks of each set of protective plate bases (15). A protective plate (17) is fixedly connected between the two sets of protective plate bases (15) through the protective pin (16). A pin (18) is inserted into one end of the protective pin (16).

8. The high-sealing anti-loosening valve cover for drilling pumps according to claim 1, characterized in that, The fixing hole (8) is a racetrack-shaped through hole, and the length of the fixing hole (8) is not less than the farthest distance between the outer edges of the two adjacent limiting holes (5).

9. The method for installing the anti-loosening valve cover according to claims 1 to 8, characterized in that, The specific steps are as follows: Step 1: Press several sealing rings (12) into the valve port (2), then fit a single sealing ring (12) onto the outside of the cylinder in the middle of the plug (11), and insert the plug (11) into the valve port (2); Step 2: Manually screw the valve cover (3) into the valve port (2), then insert the lever into the two symmetrical round holes (10) on the valve cover (3), and rotate the lever with the valve cover (3) as the center until the valve cover (3) can no longer be rotated; Step 3: Secure the locking base (6) to the outside of the limiting plate (4) through the groove (7), and then fix the locking base (6) to the cylinder body (1) of the hydraulic cylinder with bolts; Step 4: Remove the pin (18) on one side of the protective pin (16) and pull the protective pin (16) out from the base (15) of the guard plate. Use the other side of the protective pin (16) as the pivot to open the guard plate (17). Then rotate the limit screw (14) to make it exit from the fixing hole (8). Step 5: Insert the fixing pin (9) through the fixing hole (8) into the limiting hole (5), and then screw the limiting screw (14) toward the fixing hole (8) until the limiting screw (14) is in close contact with the fixing pin (9); Step 6: Close the guard plate (17), insert the pulled-out protective pin (16) into the guard plate base (15), and fix it with the pin (18).

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