Valve seat puller and method of use

Abstract

The application provides a valve seat drawing device and a use method thereof. The valve seat drawing device comprises a valve seat in a pump body, a hydraulic cylinder arranged at an end of the pump body, a drawing rod arranged in the valve seat, a drawing head fixedly arranged at one end of the drawing rod, and a locking nut arranged at the other end of the drawing rod and abutting against the hydraulic cylinder. The drawing head abuts against the valve seat. A sliding pull rod is arranged in the drawing rod. An impact head is fixedly arranged at one end of the pull rod. A sleeve is fixedly arranged at the other end of the pull rod. A spring is arranged in the sleeve. One end of the spring abuts against the sleeve, and the other end of the spring abuts against the locking nut. An impact driving device is arranged on one side of the sleeve and used for pushing the sleeve to compress the spring. The hook pushes the sleeve and the pull rod to move downwards. The elastic force of the spring makes the impact head at the end of the pull rod act on the drawing head. The hydraulic pressure in the hydraulic cylinder forms a pushing force, so that the drawing rod and the drawing head can be pushed to move upwards. The drawing head can apply the pushing force to the valve seat. Through the combination of the hydraulic drawing and the impact drawing, the maintenance and repair are more convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of oil drilling and production equipment, and specifically to a valve seat pull-out device and its usage method. Background Technology

[0002] Valve seats are common wear parts in cementing and fracturing pumps and drilling mud pumps. With advancements in oil and gas field drilling technology and the development of new processes, the power ratings of cementing and fracturing pumps and drilling mud pumps used in oilfields are increasing, and the corresponding valve seat sizes are also becoming larger. As valve seat sizes increase, coupled with advancements in materials technology, valve seat lifespans are also increasing. However, this also presents a challenge: the difficulty of pulling out valve seats is growing. Currently, valve seat pulling and replacement has become one of the main difficulties for pump maintenance personnel in field operations. Even with conventional pullers increasing the hydraulic cylinder pressure to 100MPa, they are ineffective for valve seats that are difficult to pull out, highlighting the urgent need for new valve seat pulling solutions. Summary of the Invention

[0003] The main objective of this invention is to provide a valve seat pulling device and its usage method, thereby solving the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a valve seat is provided in the pump body, a hydraulic cylinder is provided at the end of the pump body, a pull rod is provided in the valve seat, a pull head is fixed at one end of the pull rod, and the other end is abutted against the hydraulic cylinder through a locking nut, the pull head abuts against the valve seat, a sliding pull rod is provided in the pull rod, an impact head is fixed at one end of the pull rod, a sleeve is fixed at the other end, a spring is provided in the sleeve, one end of the spring abuts against the sleeve, the other end abuts against the locking nut, and an impact driving device is provided on one side of the sleeve for pushing the sleeve to compress the spring.

[0005] In the preferred embodiment, the hydraulic cylinder is connected to a hydraulic pump via an oil pipe;

[0006] The hydraulic pump is a manual hydraulic pump used to provide hydraulic pressure to the hydraulic cylinder.

[0007] In the preferred embodiment, the bottom of the hydraulic cylinder barrel rests against the pump body, the end of the piston rod rests against the locking nut, and the locking nut is threadedly connected to the end of the pull rod;

[0008] The hydraulic cylinder pushes and drives the pulling rod to move upward.

[0009] In the preferred embodiment, the impact head is located below the pull head, and the end of the pull rod is locked to the sleeve by a nut;

[0010] The impact drive device pushes the sleeve downward to compress the spring, thereby driving the pull rod to move downward. After releasing the pushing force, the spring rebounds, causing the impact head to strike the pull head.

[0011] In the preferred embodiment, the fixed seat in the impact drive device is fixed on the cylinder of the hydraulic cylinder. A side support frame is fixed on one side of the fixed seat, and a side mounting frame is fixed on the other side. A chain is provided between the side support frame and the side mounting frame. Multiple hooks are fixed on the chain, and the hooks abut against the sleeve.

[0012] In the preferred embodiment, a rotating drive sprocket is provided between the side support frame and the side mounting frame. A motor is connected to the end of the drive sprocket and is fixed on the side mounting frame. A driven sprocket is provided at the end of the side mounting frame, and the chain rotates against the drive sprocket and the driven sprocket.

[0013] In the preferred embodiment, a lug is fixed on one side of the sleeve, and the hook rests against the lug.

[0014] In the preferred embodiment, an electromagnetic heater is provided at the bottom of the valve seat. The electromagnetic heater is used to heat the pump body and the valve seat so that the pump body and the valve seat expand due to heat. Then, the valve seat is rapidly cooled down so that it separates from the pump body.

[0015] The method is as follows: S1. Drive the sleeve compression spring through the impact drive device, release the spring's rebound force, and drive the impact head to impact the valve seat through the pull rod, thereby pulling out the valve seat;

[0016] S2, or the pump body and valve seat can be heated by an electromagnetic heater and then rapidly cooled to allow the valve seat to separate from the pump body. The valve seat can then be pulled out by a pull rod through a hydraulic cylinder.

[0017] Alternatively, by using S3 or S1 to loosen the valve seat from the pump body through impact, and then using a hydraulic cylinder to push it out, the valve seat can be pulled out by the pull rod.

[0018] This invention provides a valve seat pulling device and its usage method. A motor drives a chain to rotate, causing a hook to push the sleeve and pull rod downwards, compressing a spring. When the hook disengages from the sleeve, the spring force causes the impact head at the end of the pull rod to act on the pulling head, generating an impact force until the valve seat loosens. A hydraulic pump injects hydraulic pressure into the hydraulic cylinder, creating a pushing force that pushes the pulling rod and pulling head upwards. The pulling head applies this pushing force to the valve seat until it loosens. This combination of hydraulic cylinder pulling and impact pulling ensures easy and quick valve seat pulling and replacement, making maintenance and repair more convenient and efficient. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a front sectional view of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation of the hydraulic cylinder pulling device of the present invention;

[0022] Figure 3 This is a front view of the impact driving device of the present invention;

[0023] Figure 4 This is a right view of the impact driving device of the present invention;

[0024] Figure 5 This is a left view of the impact driving device of the present invention;

[0025] Figure 6 This is a partially enlarged view a of the present invention;

[0026] In the diagram: 1. Hydraulic pump; 2. Oil pipe; 3. Pump body; 4. Sleeve; 5. Valve seat; 6. Pull head; 7. Impact head; 8. Pull rod; 9. Impact drive device; 901. Fixed base; 902. Side support frame; 903. Side mounting frame; 904. Motor; 905. Chain; 906. Hook; 907. Driven sprocket; 10. Hydraulic cylinder; 11. Spring; 12. Pull rod; 13. Nut; 14. Locking nut; 15. Electromagnetic heater. Detailed Implementation

[0027] Example 1

[0028] like Figures 1-6 As shown, a valve seat pulling device includes a valve seat 5 inside a pump body 3. A hydraulic cylinder 10 is provided at the end of the pump body 3. A pulling rod 8 is provided inside the valve seat 5. A pulling head 6 is fixed at one end of the pulling rod 8, and the other end abuts against the hydraulic cylinder 10 through a locking nut 14. The pulling head 6 abuts against the valve seat 5. A sliding pull rod 12 is provided inside the pulling rod 8. An impact head 7 is fixed at one end of the pull rod 12, and a sleeve 4 is fixed at the other end. A spring 11 is provided inside the sleeve 4. One end of the spring 11 abuts against the inside of the sleeve 4, and the other end abuts against the locking nut 14. An impact driving device 9 is provided on one side of the sleeve 4 for pushing the sleeve 4 to compress the spring 11. With this structure, the hydraulic cylinder 10 can push the locking nut 14 to move the pull rod 8 upward, so that the pull head 6 can abut against the valve seat 5 for pulling. At the same time, the impact drive device 9 pushes the downward moving sleeve 4 to move the pull rod 12 and compress the spring 11. After the pushing force is released, the spring 11 rebounds, which causes the impact head 7 at the end of the pull rod 12 to move upward and impact the valve seat 5 to pull it. Under the dual pulling action, the valve seat 5 can be pulled out better, and maintenance and repair are more convenient and faster.

[0029] In the preferred embodiment, the hydraulic cylinder 10 is connected to the hydraulic pump 1 via the oil pipe 2;

[0030] Hydraulic pump 1 is a manual hydraulic pump used to provide hydraulic pressure to hydraulic cylinder 10. With this structure, hydraulic oil is added to the manual hydraulic pump, and oil pipe 2 is connected to apply pressure to hydraulic cylinder 10, which is used to push and pull rod 8 to move upward.

[0031] In the preferred embodiment, the bottom of the cylinder of the hydraulic cylinder 10 abuts against the pump body 3, and the end of the piston rod abuts against the locking nut 14, which is threadedly connected to the end of the pull rod 8.

[0032] The hydraulic cylinder 10 pushes and drives the pulling rod 8 to move upward.

[0033] In the preferred embodiment, the impact head 7 is located below the pull head 6, and the end of the pull rod 12 is locked to the sleeve 4 by the nut 13;

[0034] The impact drive device 9 pushes the sleeve 4 downward to compress the spring 11, thereby driving the pull rod 12 to move downward. After releasing the pushing force, the spring 11 rebounds, causing the impact head 7 to impact the pull head 6.

[0035] In the preferred embodiment, the fixed seat 901 of the impact drive device 9 is fixed to the cylinder of the hydraulic cylinder 10. A side support frame 902 is fixed on one side of the fixed seat 901, and a side mounting frame 903 is fixed on the other side. A chain 905 is provided between the side support frame 902 and the side mounting frame 903. Multiple hooks 906 are fixed on the chain 905, and the hooks 906 abut against the sleeve 4. With this structure, the rotation of the chain 905 can drive the hooks 906 to move, thereby abutting against the sleeve 4 and driving it to move downward, compressing the spring 11.

[0036] In the preferred embodiment, a rotating drive sprocket is provided between the side support frame 902 and the side mounting frame 903. A motor 904 is connected to the end of the drive sprocket and is fixed to the side mounting frame 903. A driven sprocket 907 is provided at the end of the side mounting frame 903. The chain 905 rotates against the drive sprocket and the driven sprocket 907. With this structure, the motor 904 drives the drive sprocket to rotate, which in turn drives the chain 905 to rotate, thereby causing the hook 906 to abut against the sleeve 4 and push the sleeve 4 downwards.

[0037] In the preferred embodiment, a lug is fixed to one side of the sleeve 4, and the hook 906 abuts against the lug. With this structure, the hook 906 pushes against the lug on one side of the sleeve 4. After being pushed to the bottom, the hook 906 rotates and disengages from the lug, which causes the spring 11 to rebound.

[0038] In the preferred embodiment, an electromagnetic heater 15 is provided at the bottom of the valve seat 5. The electromagnetic heater 15 is used to heat the pump body 3 and the valve seat 5, causing them to expand due to heat. Then, rapid cooling is applied to separate the valve seat 5 from the pump body 3. With this structure, the valve seat 5 is bonded to the pump body 3. Heating it with the electromagnetic heater 15 causes it to expand, and rapid cooling with water causes uneven contraction, allowing the pump body 3 to separate from the valve seat 5, facilitating the pulling out of the valve seat 5.

[0039] Example 2

[0040] like Figures 1-6 As shown, further explanation is provided in conjunction with Embodiment 1: The impact drive device 9 drives the sleeve 4 to compress the spring 11, releasing the spring 11's rebound force, which in turn drives the impact head 7 to impact the valve seat 5 via the pull rod 12, thereby pulling the valve seat 5 out; alternatively, the pump body 3 and valve seat 5 are heated by the electromagnetic heater 15, and then rapidly cooled to detach the valve seat 5 from the pump body 3. The valve seat 5 can then be pulled out by the pull rod 8 via the hydraulic cylinder 10; alternatively, the valve seat 5 is loosened by impacting the pump body 3 via S1, and then the valve seat 5 can be pulled out by the pull rod 8 using the hydraulic cylinder 10. Alternatively, heating, hydraulic pushing, and the impact of the impact mechanism can be used together to ensure the valve seat 5 can be pulled out smoothly.

[0041] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method of using a valve seat pulling device, comprising a valve seat (5) inside a pump body (3), characterized in that: A hydraulic cylinder (10) is provided at the end of the pump body (3), and a pull rod (8) is provided inside the valve seat (5). A pull head (6) is fixed at one end of the pull rod (8), and the other end is abutted against the hydraulic cylinder (10) through the locking nut (14). The pull head (6) abuts against the valve seat (5). A sliding pull rod (12) is provided inside the pull rod (8). An impact head (7) is fixed at one end of the pull rod (12), and a sleeve (4) is fixed at the other end. A spring (11) is provided inside the sleeve (4). One end of the spring (11) abuts against the inside of the sleeve (4), and the other end abuts against the locking nut (14). An impact drive device (9) is provided on one side of the sleeve (4) for pushing the sleeve (4) to compress the spring (11). An electromagnetic heater (15) is provided at the bottom of the valve seat (5). The electromagnetic heater (15) is used to heat the pump body (3) and the valve seat (5) so that the pump body (3) and the valve seat (5) expand due to heat. Then, the valve seat (5) is cooled down quickly so that it separates from the pump body (3). The method is: S1. The impact drive device (9) drives the sleeve (4) to compress the spring (11), and the rebound force of the spring (11) is released. The pull rod (12) drives the impact head (7) to impact the valve seat (5), thereby pulling out the valve seat (5). S2. If the valve seat cannot be pulled out in step S1, the pump body (3) and valve seat (5) are heated by the electromagnetic heater (15) and then cooled down quickly so that the valve seat (5) is separated from the pump body (3). The valve seat (5) can be pulled out by the pull rod (8) through the hydraulic cylinder (10). S3. If the above steps fail to remove the valve seat (5) from the pump body (3) by impact in step S1, and then use the hydraulic cylinder (10) to push the valve seat (5) out by pulling the pull rod (8).

2. The method of using the valve seat pulling device according to claim 1, characterized in that: The hydraulic cylinder (10) is connected to the hydraulic pump (1) via the oil pipe (2); The hydraulic pump (1) is a manual hydraulic pump used to provide hydraulic pressure to the hydraulic cylinder (10).

3. The method of using the valve seat pulling device according to claim 1, characterized in that: The bottom of the cylinder of the hydraulic cylinder (10) abuts against the pump body (3), and the end of the piston rod abuts against the locking nut (14). The locking nut (14) is threadedly connected to the end of the pull rod (8). The hydraulic cylinder (10) pushes and drives the pulling rod (8) to move upward.

4. The method of using the valve seat pulling device according to claim 1, characterized in that: The impact head (7) is located below the pull head (6), and the end of the pull rod (12) is locked to the sleeve (4) by the nut (13); The impact drive device (9) pushes the sleeve (4) downward to compress the spring (11), thereby driving the pull rod (12) to move downward. After releasing the pushing force, the spring (11) rebounds, which causes the impact head (7) to impact the pull head (6).

5. The method of using the valve seat pulling device according to claim 1, characterized in that: The fixed seat (901) in the impact drive device (9) is fixed on the cylinder of the hydraulic cylinder (10). A side support frame (902) is fixed on one side of the fixed seat (901), and a side mounting frame (903) is fixed on the other side. A chain (905) is provided between the side support frame (902) and the side mounting frame (903). Multiple hooks (906) are fixed on the chain (905), and the hooks (906) abut against the sleeve (4).

6. The method of using the valve seat pulling device according to claim 5, characterized in that: A rotating drive sprocket is provided between the side support frame (902) and the side mounting frame (903). A motor (904) is connected to the end of the drive sprocket. The motor (904) is fixed on the side mounting frame (903). A driven sprocket (907) is provided at the end of the side mounting frame (903). The chain (905) rotates against the drive sprocket and the driven sprocket (907).

7. The method of using the valve seat pulling device according to claim 5, characterized in that: A lug is fixed on one side of the sleeve (4), and the hook (906) rests against the lug.

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