CN104712544A - Anti-loosening method for valve deck of drilling pump - Google Patents

Abstract

The invention discloses an anti-loosening method for the valve cover of a drilling pump, which relies on an adjustable anti-loosening device. The steps include: Step 1, installing a back-stop disc on the valve cover; Step 2, assembling the adjustable anti-loosening device; Step 3 1. Adjust the push rod to press the thrust plate; step 4, draw out the locking steel wire from the jacking screw to the rectangular holes on both sides of the rear of the swinging pressure block to prevent loosening and fix the jacking screw, and it is ready. The method of the present invention prevents the bonnet of the hydraulic cylinder from loosening. Due to the mechanical loosening method, the bonnet thread is effectively prevented from loosening under the working condition of the drilling pump, and the valve blockage caused by the loosening of the bonnet is effectively avoided. The leakage of the head sealing ring improves the reliability of the drilling pump operation.

Description

A method for preventing loosening of drilling pump valve cover

technical field

The invention belongs to the technical field of petroleum drilling equipment, and relates to a method for preventing loosening of a valve cover of a drilling pump.

Background technique

At present, the plugs of the discharge valves in the hydraulic end assembly of drilling pumps all adopt the bonnet compression form of large-pitch trapezoidal thread. Since the internal mud pressure is high and there are large pressure fluctuations when the drilling pump is working, the bonnet The thread is easy to loose due to vibration, so that the plug of the bonnet is not tightly pressed, and the sealing ring of the bonnet fails quickly, which leads to the leakage of the mud of the drilling pump, the product quality and the efficiency of the drilling operation are significantly reduced, and it also pollutes the environment.

Contents of the invention

The purpose of the present invention is to provide a method for preventing the bonnet of the drilling pump from loosening, which solves the problem that the bonnet of the hydraulic cylinder is easy to loosen during the operation of the drilling pump, and the sealing of the bonnet fails, which leads to the leakage of the mud of the drilling pump.

The technical solution adopted in the present invention is that a method for preventing loosening of the valve cover of the drilling pump relies on an adjustable anti-loosening device, which is specifically implemented according to the following steps:

Step 1. Install the stop disc on the valve cover

Fix the anti-retraction plate and the valve cover as a whole through a circle of screws first, and then tighten the valve cover and the hydraulic cylinder according to the specified torque; or install the valve cover on the hydraulic cylinder first and then install the thrust plate;

Step 2. Assemble the adjustable anti-loosening device

Tighten the fixed straight pin screw on the hydraulic cylinder and fix it, and install the swing clamp on the upper surface of the hydraulic cylinder through the fixed straight pin screw to ensure that the swing clamp can rotate freely along the cylindrical rod on the upper part of the fixed straight pin screw, and then push the push rod The jacking screws are respectively installed in the front light hole and the rear threaded hole of the swing clamp;

Step 3. Adjust the push rod to press the thrust plate

After the valve cover is tightened, push the push rod installed in step 2 into a tooth groove on the circumference of the thrust disc, and then tighten the cylindrical rod at the front end of the push rod against the tooth of the thrust disc by tightening the tightening screw. In the groove, ensure that the push rod is pressed tightly against the thrust plate without loosening;

Step 4. Fix the jacking screw

Draw out the locking steel wire from the jacking screw to the rectangular holes on both sides of the rear part of the swinging pressure block to lock the jacking screw and fix it.

The anti-loosening method of the valve cover of the drilling pump of the present invention is also characterized in that:

The structure of the adjustable anti-loosening device is:

A backstop disc is installed on the upper circumference of the valve cover, and the backstop disc is fixedly connected with the bonnet; there is a threaded hole on the side of the main hole on the upper part of the hydraulic cylinder, and a fixed cylindrical pin screw is installed through the threaded hole, and the fixed cylindrical pin screw Press and fix the oscillating pressure block on the upper surface of the hydraulic cylinder. A through hole is opened in the oscillating pressure block along the horizontal center line. A push rod is installed in a section of the light hole at the front end of the through hole of the oscillating pressure block facing the anti-retraction disk. The push rod The cylindrical rod at the front end is connected to the tooth groove on the circumference of the anti-retraction disc; a jacking screw is set in the threaded hole at the rear end of the through hole of the swing pressure block.

A locking steel wire is connected between the exposed screw head of the jacking screw and the rectangular holes on both sides of the rear part of the swing pressing block.

The beneficial effect of the present invention is that, by applying the anti-loosening method to the bonnet of the drilling pump liquid cylinder, the reverse force can effectively prevent the bonnet thread from loosening, improve the continuous normal working time of the drilling pump, and reduce the valve plug sealing ring. Probability of puncture leakage and maintenance cost; the structure of the adjustable anti-loosening device used in this method is simple and novel, easy to operate, and basically does not change the structure of the liquid cylinder body.

Description of drawings

Fig. 1 is the anti-loosening structure explosion schematic diagram that the inventive method adopts;

Fig. 2 is the assembly schematic diagram of the adjustable anti-loosening device that the inventive method adopts;

Fig. 3 is the sectional view of the swing briquetting block of the adjustable anti-loosening device adopted by the method of the present invention;

Fig. 4 is the push rod schematic diagram of the adjustable anti-loosening device that the inventive method adopts;

Fig. 5 is the fixed cylindrical pin screw schematic diagram of the adjustable anti-loosening device that the inventive method adopts;

Fig. 6 is the schematic diagram of the bonnet anti-return disc of the adjustable anti-loosening device adopted in the method of the present invention;

Fig. 7 is a schematic diagram of the overall assembly of the anti-loosening structure adopted in the method of the present invention.

In the figure, 1. Hydraulic cylinder, 2. Valve cover, 3. Screw, 4. Backstop plate, 5. Jacking screw, 6. Fuse, 7. Swing pressure block, 8. Fixed cylindrical pin screw, 9. Push rod .

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1-Fig. 7, the anti-loosening method of the drilling pump bonnet of the present invention adopts an adjustable anti-loosening device, and the structure of the adjustable anti-loosening device is:

A valve cover 2 is installed in the threaded hole on the upper part of the hydraulic cylinder 1 of the drilling pump equipment, (parts 1 and 2 belong to the components on the drilling pump equipment), and a stop disc 4 is installed on the upper circumference of the valve cover 2, and the stop disc 4 A plurality of screws 3 are radially fixedly connected to the valve cover 2 (the anti-retraction disc 4 and the valve cover 2 can also be made into one); there is a threaded hole on the side of the main hole on the upper part of the hydraulic cylinder 1, through which a Fixed cylindrical pin screw 8, the fixed cylindrical pin screw 8 presses and fixes the swing clamp 7 on the upper surface of the hydraulic cylinder 1, a through hole is opened in the swing clamp 7 along the horizontal center line, and the front end of the through hole of the swing clamp 7 is A push rod 9 is installed in a section of the light hole facing the anti-retraction disc 4, and the cylindrical rod at the front end of the push rod 9 is connected to the tooth groove on the circumference of the anti-retraction disc 4; Tightening screw 5, locking steel wire 6 is connected between the exposed screw head of jacking screw 5 and the rectangular hole on both sides of swinging pressure block 7 rear portion.

The outer circumference of the lower half of the fixed cylindrical pin screw 8 is threaded, and the outer circumference of the upper half is a polished rod, which is convenient for the swing of the swing briquetting block 7 .

The latter half of push rod 9 is a polished rod, and the fork-shaped end of the front end is equipped with a cylindrical rod.

The jacking screw 5 is used to adjust the telescopic position of the push rod 9 in the light hole at the front end of the swing briquetting block 7, so that the cylindrical rod at the front end of the push rod 9 and the tooth groove of the backstop disc 4 are connected reliably, and the circumference of the backstop disc 4 is reliable. The number and shape of arc grooves are set according to actual needs.

The inventive method relies on above-mentioned device, specifically implements according to the following steps:

Step 1. Install the stop disc 4 on the valve cover 2:

First fix the anti-retraction plate 4 and the valve cover 2 as a whole through a circle of screws 3, and then tighten the valve cover 2 and the hydraulic cylinder 1 according to the specified torque; or install the valve cover 2 on the hydraulic cylinder 1 first and then install the thrust plate 4, see Figure 1;

Step 2. Assemble the adjustable anti-loosening device:

Tighten the fixed straight pin screw 8 on the hydraulic cylinder 1 and fix it, and install the swing clamp 7 on the upper surface of the hydraulic cylinder 1 through the fixed straight pin screw 8, so as to ensure that the swing clamp 7 moves along the cylindrical rod on the upper part of the fixed straight pin screw 8. Can rotate freely, then put the push rod 9 and the jacking screw 5 respectively in the front light hole and the rear threaded hole of the swing briquetting block 7, see Fig. 2, Fig. 3, Fig. 5;

Step 3. Adjust the push rod 9 to press the thrust plate 4:

After the valve cover 2 is tightened, push the push rod 9 that has been installed in step 2 into a tooth groove on the circumference of the thrust plate 4, and then tighten the cylindrical rod at the front end of the push rod 9 by tightening the jacking screw 5. In the tooth groove of the push plate 4, ensure that the push rod 9 is tight against the push plate 4 without loosening, see Fig. 4 and Fig. 6;

Step 4. Fix the jacking screw 5:

From the jacking screw 5 to the rectangular hole on both sides of the rear part of the swinging pressure block 7, the locking steel wire 6 is drawn out to prevent loosening of the jacking screw 5, and it is completed, as shown in Fig. 7 .

The present invention adopts the above-mentioned method to prevent loosening of the valve cover 2 of the hydraulic cylinder 1. Since the mechanical loosening method is adopted, the loosening of the valve cover thread under the working condition of the drilling pump is effectively prevented, and the valve cover loosening caused by loosening of the valve cover is effectively avoided. The sealing ring of the valve plug is pierced and leaked, which improves the reliability of the drilling pump operation.

Claims (3)

1. A method for anti-loosening of the valve cover of a drilling pump, characterized in that it relies on an adjustable anti-loosening device, specifically implemented according to the following steps: Step 1. Install the stop disc (4) on the valve cover (2) First fix the anti-retraction plate (4) and the valve cover (2) as a whole through a circle of screws (3), and then tighten the valve cover (2) and the hydraulic cylinder (1) according to the specified torque; or in the hydraulic cylinder (1) ) on the first install the valve cover (2) and then install the thrust plate (4); Step 2. Assemble the adjustable anti-loosening device Tighten the fixed straight pin screw (8) on the hydraulic cylinder (1) and fix it, and install the swing pressing block (7) on the upper surface of the liquid cylinder (1) through the fixing straight pin screw (8) to ensure that the swing pressing block ( 7) Rotate freely along the cylindrical rod on the upper part of the fixed cylindrical pin screw (8), and then install the push rod (9) and the jacking screw (5) in the front light hole and rear threaded hole of the swing clamp (7) respectively ; Step 3. Adjust the push rod (9) to press the thrust plate (4) After the valve cover (2) is tightened, push the push rod (9) installed in step 2 into a tooth groove on the circumference of the thrust plate (4), and then tighten the jacking screw (5) to push the push rod ( 9) The cylindrical rod at the front end is pressed tightly in the tooth groove of the thrust plate (4), so as to ensure that the push rod (9) is pressed against the thrust plate (4) without loosening; Step 4. Fix the jacking screw(5) From the jacking screw (5) to the rectangular hole on both sides of the rear portion of the swing briquetting block (7), the locking steel wire (6) is drawn out and the jacking screw (5) is locked and fixed. 2. The anti-loosening method of the valve cover of the drilling pump according to claim 1, characterized in that: the structure of the adjustable anti-loosening device is: A backstop disc (4) is installed on the upper circumference of the bonnet (2), and the backstop disc (4) is fixedly connected with the bonnet (2); there is a threaded hole on the side of the main hole on the upper part of the hydraulic cylinder (1), through which The threaded hole is equipped with a fixed straight pin screw (8), which presses and fixes the swing briquetting block (7) on the upper surface of the hydraulic cylinder (1), and moves horizontally in the swing briquetting block (7). A through hole is opened on the center line, and a push rod (9) is installed in a section of the light hole facing the back-stop disc (4) at the front end of the through-hole of the swing pressure block (7), and the cylindrical rod at the front end of the push rod (9) and the back-stop disc (4) The alveolar abutting connection on the circumference; a jacking screw (5) is sleeved in the threaded hole at the rear end of the through hole of the swing briquetting block (7). 3. The anti-loosening method for the bonnet of the drilling pump according to claim 2, characterized in that: the exposed screw heads of the jacking screws (5) and the rectangular holes on both sides of the rear of the swing block (7) A locking steel wire (6) is connected between them.