Valve seat extractor

Abstract

The utility model relates to the technical field of connection or disassembly of objects in press fit, in particular to a valve seat extractor. A valve seat extractor comprises a supporting frame used for abutting against the outer wall of a valve seat in a matched mode, a screw penetrating through the supporting frame to stretch into the valve seat is arranged on the supporting frame, a fixed clamping piece and a movable clamping piece are arranged at the lower end of the screw, and an expansion piece matched with an inner ring of the valve seat is arranged between the fixed clamping piece and the movable clamping piece in a threaded mode. A driving thread sleeve is arranged on the screw, the supporting frame is provided with a supporting face used for providing support to drive the screw to move upwards when the driving thread sleeve is matched with the screw in a screwing mode, and therefore the expansion piece drives the valve seat to be pulled out. The lower end of the valve seat puller is matched with the inner ring of the valve seat and does not need to extend into the lower end of the valve seat, the requirement for the internal space is small, and the valve seat puller is simple in overall structure, convenient to operate and manufacture and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of objects used for connecting or removing press-fitting, in particular to a valve seat extractor. Background Art

[0002] Diesel engines are key equipment in the oil drilling process, which mainly provide power for drilling operations and ensure that power is continuously delivered to other drilling equipment. Valves and valve seats are one of the key components that affect the reliability and safety of diesel engines. They are mainly used to start and close the intake and exhaust ducts during the operation of the diesel engine, control the entry of fuel mixture or air, and the discharge of exhaust gas.

[0003] The working environment of valves and valve seats is very bad. In addition to the corrosion of high-temperature gas, they also have to withstand the impact of the explosion pressure in the cylinder. The main failure mode is wear. Therefore, it is necessary to replace and repair the damaged valve seats in time. When replacing the valve seats on a daily basis, they are disassembled with hammers, pry bars, chisels or other auxiliary tools. Since the valve seats are assembled with interference fit, the repair process is not only difficult, but also inefficient, and requires the cooperation of at least two people. There are 48 valve seats on the commonly used 12v190 diesel engine. The process is cumbersome and requires high skills for the disassembly personnel. Improper cooperation can easily cause damage to the valve seat installation hole, affecting the installation of the new valve seat, and seriously leading to the scrapping of the cylinder head.

[0004] The utility model patent with authorization announcement number CN215942776 U discloses a disassembly device for a valve seat ring, including: a support frame, which is used to abut and fix the outer wall of a valve seat that cooperates with the valve seat ring; an adjustment frame, which includes a driving rod threadedly connected to the support frame and an adjusting rod rotatably connected to the driving rod, and the end of the adjusting rod away from the driving rod is rotatably connected to a plurality of abutting rods, and the plurality of abutting rods are circumferentially distributed on the outside of the adjusting rod; an adjusting assembly, which is connected to the plurality of abutting rods and is used to expand or collapse the plurality of abutting rods; when the plurality of abutting rods are expanded, the diameter of the circle formed by their free ends is larger than the inner ring diameter of the valve seat ring and smaller than the outer ring diameter of the valve seat ring; when the plurality of abutting rods are collapsed, they can freely pass through the inner ring of the valve seat ring, and the process of removing the valve seat ring is quick and efficient.

[0005] However, the valve seat ring removal device requires a driving rod to extend into a certain space at the bottom of the valve seat, and multiple opposing rods to unfold and form a stop with the lower end of the inner ring of the valve seat. The winding wire is reeled in or unreeled by rotating the take-up wheel to achieve the retraction and expansion of the multiple opposing rods. This device has high requirements for the space at the lower end of the inner ring of the valve seat, and is not suitable for valve seats with insufficient internal space. In addition, the device has a complex structure and high manufacturing cost. Utility Model Content

[0006] The utility model aims to provide a valve seat extractor, which is used to solve the problem that the existing valve seat extractor has high requirements on the space at the lower end of the valve seat and has a complex structure.

[0007] The valve seat puller of the utility model adopts the following technical scheme: a valve seat puller comprises a support frame for cooperating with the outer wall of the valve seat, a screw rod passing through the support frame and extending into the valve seat is arranged on the support frame, a fixed clamping piece is arranged at the lower end of the screw rod and a movable clamping piece is threadedly assembled, an expansion piece cooperating with the inner ring of the valve seat is arranged between the fixed clamping piece and the movable clamping piece, a driving screw sleeve is arranged on the screw rod, and the support frame has a supporting surface for providing support to drive the screw rod to move upward when the driving screw sleeve is screwed with the screw rod, so as to realize that the expansion piece drives the valve seat to be pulled out.

[0008] The valve seat extractor of the utility model is improved on the existing valve seat extractor. When the valve seat extractor of the utility model is used, the movable clamping part is first screwed upward to make the expansion part in a contracted state, and one end of the expansion part is extended into the inner ring of the valve seat, and the support frame and the outer wall of the valve seat are matched and pressed tightly, and then the movable clamping part is screwed downward to make the expansion part compress and expand radially to press against the inner ring of the valve seat, so as to achieve an interference fit with the inner ring of the valve seat, and finally the driving screw sleeve is screwed, and when the driving screw sleeve is screwed with the screw rod, the supporting surface of the support frame is used as a supporting point to drive the screw rod to move upward, and the upward movement of the screw rod drives the expansion part on the screw rod to move upward, so as to achieve the expansion part driving the valve seat to be pulled out. The lower end of the valve seat extractor of the utility model is matched with the inner ring of the valve seat, and there is no need to extend into the lower end of the valve seat, and the internal space requirement is small, and the overall structure is simple, easy to operate, easy to manufacture, and the manufacturing cost is low.

[0009] Furthermore, the movable clamping member includes a movable nut and a pressing sleeve which is independently arranged between the movable nut and the expansion member. The movable nut is easy to be operated with a tool to achieve screwing with the screw rod, and the expansion member is conveniently contracted and expanded, with high efficiency, simple structure and convenient operation. By setting a pressing sleeve which is independent of the movable nut to press the expansion member, the pressing sleeve does not rotate with the movable nut, the pressing effect is better, and the movable nut is screwed on the pressing sleeve for easy use.

[0010] Furthermore, the pressing sleeve is a tapered sleeve with a small diameter facing the expansion piece. The tapered surface of the tapered sleeve can achieve good compression on the expansion piece, making it easier for the movable clamping piece to achieve the expansion state of the expansion piece.

[0011] Furthermore, the fixing clamping member includes a fixing nut and a tapered sleeve disposed between the fixing nut and the expansion member and having a small diameter facing the expansion member. A tapered sleeve is also disposed at the lower end, and the expansion member is squeezed from both ends of the expansion member by the two tapered sleeves, so that the use effect is better, the fixing nut has a simple structure, is convenient to cooperate with the screw rod, can be kept fixed in the unscrewed state, and has a good supporting effect on the tapered sleeve, the tapered sleeve does not need to be fixed on the screw rod, and the manufacturing cost is low.

[0012] Furthermore, there are multiple groups of expansion pieces, which are distributed along the axial direction of the screw rod, and washers sleeved on the screw rod are arranged between axially adjacent expansion pieces. There are multiple groups of expansion pieces and they are distributed along the axial direction of the screw rod, which increases the contact area with the inner ring of the valve seat, and can clamp the inner ring of the valve seat more effectively. Washers sleeved on the screw rod are arranged between axially adjacent expansion pieces, so that there are hard parts between each group of expansion pieces to squeeze them, and the squeezing effect is better. The washers also play a role in fixing the expansion pieces in the axial direction, and this arrangement increases friction resistance and effectively prevents slipping.

[0013] Furthermore, each group of expansion pieces has multiple petals, and is an arc-shaped structure distributed around the screw, and there is a gap between the circumferentially adjacent expansion pieces. This arrangement increases the expansion space of each petal expansion piece, so that the expansion piece can expand outwards a greater distance, and better achieves a tight fit with the inner ring of the valve seat.

[0014] Furthermore, the outer peripheral surface of the tightening piece at the lower side is provided with an outer flange. Providing the outer peripheral surface of the tightening piece at the lower side with the outer flange increases the tightening effect of the tightening piece, so as to facilitate clamping with the inner ring of the valve seat.

[0015] Furthermore, the driving screw sleeve and the supporting surface of the supporting frame are in rolling cooperation, and the friction resistance is greatly reduced during the rolling cooperation operation of the driving screw sleeve and the supporting surface of the supporting frame, so that the driving effect is better and the operation is labor-saving.

[0016] Furthermore, the driving screw sleeve includes a driving nut, and an end face bearing is arranged between the driving nut and the support frame. The driving nut has a simple structure and is easy to screw. The end face bearing realizes rolling fit and has a good effect of reducing friction resistance.

[0017] Furthermore, the support frame is a door-shaped structure, the upper crossbeam of the door-shaped structure has a supporting surface, and the two side columns of the door-shaped structure are used to cooperate with the outer wall of the valve seat. The support frame is set to a door-shaped structure, the upper crossbeam surface is convenient to cooperate with the drive screw sleeve, and the column is convenient to cooperate with the outer wall of the valve seat. The overall structure is stable, easy to manufacture, and the supporting effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the valve seat puller of the utility model.

[0019] In the figure: 1. screw; 2. hand-held upper nut; 3. hand-held lower nut; 4. drive nut; 5. end bearing; 6. support frame; 7. movable nut; 8. upper tapered sleeve; 9. expansion piece; 10. washer; 11. outer flange; 12. lower tapered sleeve; 13. fixing nut. DETAILED DESCRIPTION

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] Specific embodiment 1 of the valve seat puller of the utility model:

[0022] The valve seat puller of the utility model is as follows Figure 1 As shown, a valve seat extractor comprises a support frame 6, which is a door-shaped structure. The two uprights of the support frame 6 are used to cooperate and press against the outer wall of the valve seat. The upper crossbeam of the support frame 6 has a supporting surface. A screw 1 is provided on the support frame 6, which passes through the support frame 6 and extends into the valve seat. A fixed clamp is provided at the lower end of the screw 1 and is threadedly assembled with a movable clamp. A tightening piece 9 that cooperates with the inner ring of the valve seat is provided between the fixed clamp and the movable clamp. The movable clamp is screwed upward so that the tightening piece 9 is in a contracted state and freely penetrates the inner ring of the valve seat. The movable clamp is screwed downward so that the tightening piece 9 is compressed and radially expanded to press against the inner ring of the valve seat, thereby realizing an interference fit with the inner ring of the valve seat. A driving screw sleeve is provided on the screw 1. When the driving nut 4 is screwed with the screw 1, the screw 1 is driven to move upward with the supporting surface as the supporting point. The upward movement of the screw 1 drives the tightening piece 9 on the screw 1 to move upward, thereby realizing that the tightening piece 9 drives the valve seat to be pulled out.

[0023] In order to reduce sliding friction, in the present embodiment, the driving screw sleeve and the supporting surface of the supporting frame 6 are rolled together. Preferably, the driving screw sleeve includes a driving nut 4, and an end bearing 5 is arranged between the driving nut 4 and the supporting frame 6. When the driving nut 4 cooperates with the screw 1, the friction resistance is greatly reduced, and the operation is labor-saving.

[0024] On both ends of the expansion piece 9 on the screw 1, there are conical sleeves with a small diameter facing the expansion piece 9, which are respectively an upper conical sleeve 8 and a lower conical sleeve 12. The upper conical sleeve 8 is an inverted conical structure, and the lower conical sleeve 12 is a positive conical structure. Nuts are respectively provided on the far side of the two conical sleeves, which are respectively a fixed nut 13 and a movable nut 7. The fixed nut 13 and the lower conical sleeve 12 constitute a fixed clamping part, which is located at the bottom of the screw 1. The movable nut 7 and the upper conical sleeve 8 constitute a movable clamping part. When the movable nut 7 is screwed upward, the expansion piece 9 shrinks to freely penetrate the inner ring of the valve seat. When the movable nut 7 is screwed downward, the expansion piece 9 is squeezed by the conical sleeve to expand radially and press against the inner ring of the valve seat.

[0025] Specifically, there are three groups of expansion pieces 9, which are distributed axially along the screw 1. Each group of expansion pieces 9 is composed of four petals evenly distributed around the screw 1, and are all arc-shaped structures. There is a certain gap between the expansion pieces 9 adjacent to each other in the circumferential direction, providing more expansion space. A gasket 10 sleeved on the screw 1 is arranged between the axially adjacent expansion pieces 9, which plays a role in fixing the expansion pieces 9 in the axial direction. The conical sleeve and the gasket 10 are both made of hard materials. There is a hard material between each group of expansion pieces 9 to squeeze them, which is convenient for the expansion pieces 9 to expand radially, and increases the friction resistance, effectively preventing slipping. The lowermost expansion piece 9 is provided with an outer flange 11 at its lower end to fit with the lower conical sleeve 12, ensuring that the expansion piece 9 is better clamped with the inner ring of the valve seat and improving the expansion effect.

[0026] In this embodiment, in order to facilitate the use of the operator, a hand-held portion is provided at the upper end of the screw rod 1, which includes a hand-held upper nut 2 and a hand-held lower nut 3, and the two nuts are fitted and fixed to form the hand-held portion.

[0027] When the valve seat extractor of the utility model is in use, the movable nut 7 is screwed upwards to make the expansion piece 9 shrink to the point where it can freely penetrate into the inner ring of the valve seat, and one end of the expansion piece 9 of the screw rod 1 is extended into the position of the inner ring of the valve seat, so that the column of the support frame 6 is matched and pressed against the outer wall of the valve seat, and the movable nut is screwed downwards to make the expansion piece 9 axially compressed and radially extended outward to press against the inner ring of the valve seat, thereby achieving an interference fit with the inner ring of the valve seat. The hand-held part on the upper part of the screw rod 1 is held, and the driving nut 4 is screwed with a tool. When the driving nut 4 is screwed with the screw rod 1, the axial position is kept stationary with the supporting surface of the support frame 6 as a fulcrum, thereby driving the screw rod 1 to move upward. When the screw rod 1 moves upward, the expansion piece 9 on the screw rod 1 drives the valve seat to be pulled out during the upward movement.

[0028] Through the above description of the specific embodiment 1 of the valve seat puller of the utility model, it can be seen that the valve seat puller of the utility model makes the expansion piece cooperate with the inner ring of the valve seat by setting and adjusting the movable nut, and does not need to extend into the lower end of the valve seat, and requires little internal space. The driving nut drives the screw rod to move upward to drive the valve seat to be pulled out. The structure is simple, the operation is convenient, and the manufacturing cost is low. The diesel engine valve seat can be quickly disassembled to ensure the accuracy of disassembly, effectively enhance the work efficiency of the on-site operators, reduce the requirements for the skill level of the operators, and avoid the reduction of the yield rate of workpiece replacement due to tool problems. It is easy to carry, safe and reliable, and has strong applicability.

[0029] Of course, the valve seat extractor of the present invention is not limited to the above-mentioned embodiments. Several other implementation methods of the valve seat extractor based on the design concept of the present invention are also listed below.

[0030] For example, in other embodiments, different from the above-mentioned embodiment 1, the movable clamping member includes a movable nut and an upper conical sleeve, the fixed clamping member is a fixed nut or welded with gaskets, retaining rings and other connecting parts, and the lower end is no longer provided with a lower conical sleeve.

[0031] For example, in other embodiments, different from the above-mentioned embodiment 1, the fixed clamping member is a lower conical sleeve, and the lower conical sleeve is provided with an internal thread that is screwed together with the screw rod, and is fixed to the bottom of the screw rod by threaded cooperation, so a fixing nut is no longer provided.

[0032] For example, in other implementations, different from the above-mentioned embodiment 1, each group of expansion members has two, three, five or more expansion members, which are evenly distributed around the circumference of the screw, and there are gaps between circumferentially adjacent expansion members.

[0033] For another example, in other implementations, different from the above-mentioned embodiment 1, the driving screw sleeve and the upper cross beam of the support frame are rollingly matched, a ball groove is provided in the driving screw sleeve or on the upper cross beam, and a ball is installed in the ball groove.

[0034] For another example, in other implementations, different from the above-mentioned first embodiment, both sets of tensioning members on the lower side are provided with outer flanges, or all tensioning members are the same, and no outer flange is provided only under the tensioning member on the lowermost side.

[0035] Or in other implementations, different from the above-mentioned embodiment 1, the expansion piece is a circumferentially closed annular expansion sleeve, and there are multiple expansion sleeves distributed along the axial direction, and washers sleeved on the screw are arranged between adjacent expansion sleeves.

[0036] Or in other embodiments, different from the above-mentioned embodiment 1, the drive nut is slidably matched with the upper beam of the support frame, and the drive nut is directly screwed on the support surface of the upper beam surface to drive the screw rod upward with the support surface as the support point, and no bearing is provided.

[0037] Alternatively, in other embodiments, different from the above-mentioned embodiment 1, the movable clamping member is an upper conical sleeve, which is provided with an internal thread that is screwed together with the screw rod, and the upper conical sleeve is directly screwed to extrude the expansion member, so a movable nut is no longer provided.

[0038] Alternatively, in other implementations, different from the above-mentioned first embodiment, the support frame is a tripod structure, the top of the tripod has a support surface, and the support surface of the support frame serves as a support point of the drive nut.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve seat extractor, comprising a support frame (6) for cooperating with the outer wall of the valve seat, a screw (1) is arranged on the support frame (6) and extends through the support frame (6) into the valve seat, wherein: A fixed clamping piece is arranged at the lower end of the screw rod (1) and a movable clamping piece is threadedly assembled thereon; an expansion piece (9) that cooperates with the inner ring of the valve seat is arranged between the fixed clamping piece and the movable clamping piece; a driving screw sleeve is arranged on the screw rod (1); and a support frame (6) has a support surface for providing support to drive the screw rod (1) to move upward when the driving screw sleeve is screwed with the screw rod (1), thereby realizing that the expansion piece (9) drives the valve seat to be pulled out.

2. The valve seat extractor according to claim 1, characterized in that: The movable clamping member comprises a movable nut (7) and a pressing sleeve which is independently of the movable nut (7) and is arranged between the movable nut (7) and the expansion member (9).

3. The valve seat extractor according to claim 2, characterized in that: The pressing sleeve is a conical sleeve with a small diameter facing the expansion piece (9).

4. The valve seat extractor according to claim 3, characterized in that: The fixing clamping member comprises a fixing nut (13) and a conical sleeve arranged between the fixing nut (13) and the expansion member (9) and having a small diameter facing the expansion member (9).

5. The valve seat extractor according to claim 1, characterized in that: There are multiple groups of expansion pieces (9), which are distributed axially along the screw rod (1), and washers (10) sleeved on the screw rod (1) are arranged between axially adjacent expansion pieces (9).

6. The valve seat extractor according to claim 4, characterized in that: Each group of expansion pieces (9) has multiple lobes and is an arc-shaped structure distributed circumferentially around the screw rod (1), and there is a gap between the expansion pieces (9) adjacent to each other in the circumferential direction.

7. The valve seat extractor according to claim 5, characterized in that: The outer peripheral surface of the expansion piece (9) located at the lower side is provided with an outer flange (11).

8. The valve seat extractor according to any one of claims 1 to 7, characterized in that: The driving screw sleeve is in rolling cooperation with the supporting surface of the supporting frame (6).

9. The valve seat extractor according to claim 8, characterized in that: The driving screw sleeve comprises a driving nut (4), and an end face bearing (5) is arranged between the driving nut (4) and the supporting frame (6).

10. The valve seat extractor according to any one of claims 1 to 7, characterized in that: The support frame (6) is a gate-shaped structure, the upper crossbeam of the gate-shaped structure has a supporting surface, and the upright columns on both sides of the gate-shaped structure are used to cooperate with and tightly abut against the outer wall of the valve seat.

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