Valve retainer dismounting tool and method

Abstract

The invention relates to the technical field of engine maintenance, and discloses a valve seat ring dismounting tool and method.The valve seat ring dismounting tool is characterized in that a first gear and a second gear which are meshed with each other are arranged in a cylindrical structure, an adjusting handle extends into the cylindrical structure to drive the first gear to rotate, and clamping screws with opposite thread rotating directions are fixed to the two sides of the second gear; a clamping sliding block is in threaded fit with each clamping screw rod, and the two clamping sliding blocks are driven to be close to or away from each other through the adjusting handle; a fixing head is arranged at one end of the clamping sliding block and can stretch out of the cylindrical structure to be connected with a clamping groove in the valve seat ring in a clamped mode. The bottom end of the lifting nut is in threaded fit with the cylindrical structure, and the top end of the lifting nut is matched with the rotating wrench; the special tool is designed and manufactured, the machining mode of the valve seat ring is improved, the problem of disassembly of the valve seat ring is solved, deformation and damage of a seat ring hole and a combustion chamber face in the disassembly process are avoided, potential safety hazards are prevented, and production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine maintenance, in particular to a valve seat ring disassembly tool and method. Background Art

[0002] The valve seat is a metal ring installed on the cylinder head, which is used to seal with the valve to ensure the sealing of the combustion chamber. During the operation of the engine, the valve seat will be affected by high temperature, high pressure, wear and tear, which will cause deformation, cracks, ablation and other damage to the valve seat, affecting the performance and life of the engine. Therefore, the valve seat needs to be inspected and replaced regularly.

[0003] At present, there are two main methods for disassembling valve seat rings: one method is to use a special valve seat ring remover to clamp the valve seat ring and then pull it out using the lever principle. The disadvantage is that it is expensive and not suitable for valve seat rings of different models; the other method is to use tools such as a hammer and an impact drill to break the valve seat ring and then remove it with tools such as pliers, but this method is easy to damage key components such as the cylinder head combustion chamber surface, the seat ring hole and the valve guide, and the operation is time-consuming and labor-intensive, and the efficiency is low; after searching, CN202097703U discloses a special tool for disassembling the valve seat ring of a diesel engine cylinder head, which uses the valve seat ring grabber to open the valve seat ring, the grabber hook hooks the bottom of the valve seat ring, and pulls out the valve seat ring. This method is only suitable for the case where there is space at the bottom of the valve seat ring, but in this case, the valve seat ring will affect the airflow direction and cause local temperature rise. Most of the current valve seat rings are close to the cylinder head, and the valve seat ring cannot be pulled out by hooking the bottom of the valve seat ring with the grabber hook. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a valve seat ring disassembly tool and method, which solves the problem of valve seat ring disassembly by designing and manufacturing special tools and improving the valve seat ring processing method. The tool has a simple structure and is easy to operate, avoids deformation and damage of the seat ring hole and the combustion chamber surface during disassembly, prevents safety hazards, and improves production efficiency.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, a valve seat removal tool comprises:

[0007] The clamping mechanism comprises a cylindrical structure, wherein a first gear and a second gear meshing with each other are arranged inside the cylindrical structure, an adjusting handle is extended into the cylindrical structure to drive the first gear to rotate, clamping screws with opposite thread rotation directions are fixed on both sides of the second gear, and a clamping slider is matched with a thread on each clamping screw, and the two clamping sliders are driven to move closer to or away from each other by the adjusting handle; a fixing head is arranged at one end of the clamping slider, and the fixing head can extend out of the cylindrical structure and be clamped with a clamping groove on the valve seat ring;

[0008] The telescopic support includes a support platform, which is rotatably matched with the lifting mechanism through a bearing hole. The lifting mechanism includes a lifting nut, the bottom end of the lifting nut is matched with the cylindrical structure thread, and the top end is matched with a rotating wrench. The rotating wrench drives the lifting nut to rotate to realize the lifting of the cylindrical structure.

[0009] As a further implementation method, telescopic legs are provided on the peripheral side of the support platform, the bearing hole is provided at the center of the support platform, and the bearing hole is interference fit with the outer ring of the rolling bearing.

[0010] As a further implementation method, the inner ring of the rolling bearing is interference fit with the outer ring of the lifting nut, the bottom end of the lifting nut is open and has a fixed end internal thread, which cooperates with the top circumference of the cylindrical structure through the fixed end internal thread.

[0011] As a further implementation method, the telescopic leg is adjusted in length by a locking knob, and a flexible base is provided at the bottom end of the telescopic leg.

[0012] As a further implementation method, the top end of the cylindrical structure is open and provided with a movable end external thread, and the movable end external thread cooperates with the fixed end internal thread.

[0013] As a further implementation method, the adjustment handle includes a rotating shaft, which is rotatably matched with the side wall of the cylindrical structure and fixedly connected to the first gear. One end of the adjustment handle extends out of the cylindrical structure to drive the first gear to rotate.

[0014] As a further implementation method, the second gear is meshed with the lower part of the first gear, and one end of the clamping screws on both sides of the second gear is fixed at the center of the second gear, and the other end is rotatably matched with the inner wall of the cylindrical structure.

[0015] As a further implementation, the bottom of the cylindrical structure is a slider base, and the slider cooperates with a slide groove on the slider base.

[0016] As a further implementation, a locking block is further included. A hole is opened on the cylindrical structure, and one end of the locking block is used to pass through the hole and engage with the first gear.

[0017] In a second aspect, a valve seat removal method is provided, using any of the valve seat removal tools described above, comprising the following steps:

[0018] A clamping groove is machined on the valve seat ring, and the telescopic support is placed on the combustion chamber surface of the cylinder head. The telescopic support leg is adjusted to align the clamping slide block with the clamping groove. The first gear, the second gear, and the clamping screw are driven to rotate by the adjusting handle. The clamping slide blocks on both sides drive the seat ring fixing head to engage with the clamping groove, and the locking block engages with the first gear to lock. The rotating wrench is turned to drive the lifting nut to rotate, thereby raising the lifting nut and pulling out the valve seat ring.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention processes the clamping groove and moves the clamping slider to both sides so that the fixed head is engaged with the clamping groove. Then, the lifting nut is rotated by turning the wrench to realize that the cylindrical structure drives the clamping slider to lift and the valve seat ring is pulled out.

[0021] 2. The present invention ensures that the cylinder head will not be damaged when the valve seat ring is pulled out by directly cooperating with the processed clamping groove; the setting of the locking block ensures that the clamping slide block will not slide when the valve seat ring is pulled out.

[0022] 3. The present invention solves the problem of valve seat ring disassembly by designing and manufacturing special tools and improving the valve seat ring processing method. The tool has a simple structure and is easy to operate. It avoids deformation and damage to the seat ring hole and the combustion chamber surface during disassembly, prevents safety hazards, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 1 is a schematic diagram of the overall structure of a valve seat removal tool according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 AA cross-sectional structure diagram;

[0026] Figure 3 yes Figure 1 Middle AA section structure main view;

[0027] Figure 4 is a schematic structural diagram of a telescopic support in an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the valve seat ring in the embodiment of the present invention.

[0029] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0030] Among them: 10, cylinder head; 20, valve seat ring; 21, clamping groove; 30, clamping mechanism; 31, adjusting handle; 32, first gear; 33, rotating shaft; 34, second gear; 35, clamping screw; 36, clamping slider; 361, fixed head; 37, slider base; 38, cylindrical structure; 39, locking block; 40, lifting mechanism; 41, lifting nut; 42, internal thread of fixed end; 43, rolling bearing; 44, fixed end; 50, telescopic support; 51, support platform; 52, bearing hole; 53, telescopic support leg; 54, locking knob; 55, base; 60, turning wrench. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] Embodiment 1

[0033] In a typical embodiment of the present invention, reference is made to Figure 1-Figure 5 As shown, a valve seat ring removal tool includes a clamping mechanism 30, a lifting mechanism 40, a telescopic support 50, and a rotating wrench 60, wherein the telescopic support is used to be placed on the combustion chamber surface of the cylinder head, the lifting mechanism is arranged on the telescopic support 50 and is rotatably matched with the telescopic support 50, the bottom of the lifting mechanism 40 is threadedly matched with the clamping mechanism 30, the bottom end of the clamping mechanism 30 is used to cooperate with the clamping groove machined on the valve seat ring through the fixed head 361 on the clamping slider 36, and the rotating wrench 60 cooperates with the lifting mechanism 40.

[0034] The clamping mechanism 30 includes a cylindrical structure 38, and a pair of meshing gear sets are arranged inside the cylindrical structure 38. The gear sets include a first gear 32 and a second gear 34. The adjusting handle extends into the cylindrical structure to drive the first gear 32 to rotate. Clamping screws 35 with opposite thread rotation directions are fixed on both sides of the second gear 34. The clamping screws 35 are threadedly matched with a clamping slider 36, and the clamping slider 36 is driven to move closer or farther by adjusting the handle 31; a fixed head 361 is provided at one end of the clamping slider 36, and the fixed head 361 can extend out of the cylindrical structure 38 and be clamped with the clamping groove 21 on the valve seat ring 20; the telescopic support 50 includes a support platform 51, and the support platform 51 is rotatably matched with the lifting mechanism 40 through the bearing hole 52. The lifting mechanism 40 includes a lifting nut 41, and the bottom end of the lifting nut 41 is threadedly matched with the peripheral side of the top end of the cylindrical structure 38, and the top end of the lifting nut 41 is matched with a rotating wrench 60, and the rotating wrench 60 drives the lifting nut 41 to rotate, so as to realize the lifting of the cylindrical structure 38.

[0035] like Figure 4As shown, the telescopic support 50 includes a support platform 51 , a bearing hole 52 , a telescopic support leg 53 , a locking knob 54 , and a base 55 .

[0036] The support platform 51 is circular, with a bearing hole 52 at the center of the support platform 51, at least two sets of telescopic legs 53 are provided on the circumference of the support platform 51, the length of the telescopic legs 53 is adjusted by a locking knob 54, and a flexible base 55 is provided at the bottom of the telescopic legs 53. The base 55 is made of softer material or has a plastic pad to prevent collision with the combustion chamber surface.

[0037] The telescopic legs 53 include legs connected to the support platform 51, the lower ends of the legs are plugged into the sleeve, the locking knob 54 passes through the sleeve and abuts against the legs, and the relative positions of the legs and the sleeve can be fixed. The base 55 is fixed to the bottom of the sleeve, and the bearing hole 52 is provided with a rolling bearing 43, which is interference fit with the outer ring of the rolling bearing 43.

[0038] like Figure 2 and Figure 3 As shown, the lifting mechanism 40 includes a lifting nut 41 , an internal thread 42 at a fixed end, a rolling bearing 43 , and a fixed end 44 .

[0039] The lifting nut 41 is a cylindrical structure, and the inner ring of the rolling bearing 43 is interference fit with the outer ring of the lifting nut 41, so that the lifting nut 41 and the support platform 51 are relatively fixed and rotated. The bottom end of the lifting nut 41 is open and is provided with a fixed end internal thread 42. The fixed end internal thread 42 cooperates with the movable end external thread on the top side of the cylindrical structure 38, and the lifting nut 41 rotates to realize the lifting and lowering of the cylindrical structure 38. The top of the lifting nut 41 is a fixed end 44, and the cross section is a regular hexagon, so as to cooperate with the rotating wrench 60.

[0040] like Figure 2 and Figure 3 As shown, the clamping mechanism includes an adjusting handle 31 , a first gear 32 , a rotating shaft 33 , a second gear 34 , a clamping screw 35 , a clamping slider 36 , a fixing head 361 , a slider base 37 , a cylindrical structure 38 , and a locking block 39 .

[0041] The top of the cylindrical structure 38 is open and provided with an external thread at a movable end. The external thread at the movable end cooperates with the internal thread 42 at the fixed end of the lifting nut 41 , and the interior of the cylindrical structure 38 is hollow.

[0042] A pair of meshing gear sets are disposed inside the cylindrical structure 38 and are distributed up and down, namely a first gear 32 and a second gear 34 . The second gear 34 is meshed below the first gear 32 .

[0043] The adjusting handle 31 includes a rotating shaft 33, one end of which extends into the interior of the cylindrical structure 38 and rotates with the side wall of the cylindrical structure 38 to support the first gear 32. The rotating shaft 33 is fixedly connected to the first gear 32, and one end of the adjusting handle 31 extends out of the cylindrical structure 38. The adjusting handle 31 is L-shaped. By rotating the adjusting handle 31, the rotating shaft 33 can drive the first gear 32 to rotate, thereby realizing the rotation of the second gear 34.

[0044] The second gear 34 is located directly below the first gear 32. One end of the clamping screws 35 on both sides of the second gear 34 is fixed at the center of the second gear 34, and the other end is rotatably matched with the inner wall of the cylindrical structure 38. The thread rotation directions of the clamping screws 35 on both sides of the second gear 34 are opposite. The two clamping screws 35 are threadedly matched with clamping sliders 36. The first gear 32 drives the second gear 34 to rotate, and the second gear 34 drives the clamping screws 35 to rotate, so that the clamping sliders 36 on both sides move in opposite directions or opposite directions.

[0045] The bottom of the cylindrical structure 38 is closed and serves as a slider base 37 . A slide groove is provided on the slider base 37 in the movement direction of the corresponding clamping slider. The clamping slider cooperates with the slide groove on the slider base, and the slide groove guides the movement of the clamping slider 36 .

[0046] like Figure 3 As shown, the fixing head 361 is installed at the end of the clamping slider away from the second gear 34. The clamping slider 36 is T-shaped. The fixing head 361 at its outer end can extend out of the cylindrical structure and be inserted into the clamping groove 21 processed in advance under the push of the clamping slider 36 to achieve a snap-fit ​​with the valve seat ring 20. Holes need to be opened at the corresponding positions of the side walls of the cylindrical structure.

[0047] The cylindrical structure 38 has an opening on the side wall at the height corresponding to the first gear 32, and one end of the locking block 29 is used to pass through the opening and mesh with the first gear 32. The locking block 39 is a long block structure with teeth processed at the front end. The locking block 39 is inserted into the cylindrical structure 38 through the opening, and the teeth at the front end mesh with the first gear 32, which can lock the first gear 32 and realize the locking of the clamping slider 36. When the valve seat ring 20 is pulled out, the clamping slider 36 will not slide.

[0048] like Figure 5 As shown, the valve seat ring 20 needs to be pre-processed with a clamping groove on the opposite side of the inner surface using a special tool to facilitate the clamping of the fixing head 361.

[0049] In this embodiment, the clamping groove is processed, and the clamping slider is moved to both sides so that the fixed head is engaged with the clamping groove. Then, the lifting nut is rotated by turning the wrench, so that the cylindrical structure drives the clamping slider to lift and the valve seat ring is pulled out. The setting of the locking block ensures that the clamping slider will not slide when the valve seat ring is pulled out.

[0050] The problem of valve seat disassembly was solved by designing and manufacturing special tools and improving the valve seat processing method. The tool has a simple structure and is easy to operate. It avoids deformation and damage to the seat hole and combustion chamber surface during disassembly, prevents safety hazards, and improves production efficiency.

[0051] Embodiment 2

[0052] In a typical embodiment of the present invention, reference is made to Figure 1-Figure 5 As shown, a valve seat ring disassembly method, using a valve seat ring disassembly tool in embodiment 1, comprises the following steps:

[0053] When the valve seat ring of the cylinder head needs to be removed, a clamping groove 21 is machined on the valve seat ring by using a special tool, and then the telescopic support 50 is placed on the combustion chamber surface of the cylinder head 10, the locking knob 54 is loosened, the telescopic leg 53 is adjusted to a suitable working position, the clamping slider 36 is aligned with the clamping groove 21 on the valve seat ring, and the locking knob 54 is tightened to fix the telescopic support 50 on the cylinder head 10. The adjustment handle 31 is rotated clockwise, and the handle drives the rotating shaft 33 to rotate, and drives the first gear 32, the second gear 34, and the clamping screw 35 to rotate. The clamping sliders 36 at both ends are spirally driven through two sections of threads rotating in opposite directions, and at the same time move to the side close to the clamping groove 21, driving the fixed head 361 to fit with the clamping groove 21, and the locking block 39 is inserted into the groove outside the clamping mechanism, and the teeth of the locking block 39 mesh with the first gear 32, so as to achieve the purpose of locking the slider.

[0054] The cross section of the fixed end 44 of the lifting mechanism 40 is a regular hexagon, which can cooperate with the rotating spanner 60. The rotating spanner 60 is set on the fixed end 44, and the rotating spanner 60 is turned to drive the lifting nut 41 to rotate. The inner ring of the rolling bearing 43 rotates while ensuring that the height position of the lifting nut 41 remains unchanged. Therefore, the lifting nut serves as the fixed end of the spiral transmission, and the movable end of the spiral transmission is the clamping mechanism 30. The movable end external thread on the cylindrical structure 38 of the clamping mechanism 30 is threadedly connected with the fixed end internal thread 42 of the lifting mechanism 40. Since the fixed head of the clamping mechanism has been fitted with the clamping groove and the two sides are stressed, the clamping mechanism cannot rotate. Therefore, according to the principle of spiral transmission, the clamping mechanism translates upward until the valve seat ring is taken out.

[0055] After lifting the valve seat ring to above the combustion chamber surface, take out the locking block 39, turn the adjusting handle 31 counterclockwise, move the seat ring fixing head 361 and the clamping slider 36 to the side away from the clamping groove, take out the valve seat ring 20 and store it, take away the tool and restore it to its original state. At this time, since the clamping mechanism 30 cannot be fixed circumferentially, it is necessary to adjust the working position and then manually rotate the clamping mechanism 30 to restore the clamping mechanism to its original position.

[0056] The disassembly tool can realize the integral disassembly of the valve seat ring and ensure that the surface of the cylinder head and the surface of the seat ring hole will not be damaged, thereby improving production efficiency and reducing labor intensity. At the same time, the device can be extended to disassemble valve seat rings of various sizes and models.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve seat removal tool, characterized in that: include: The clamping mechanism comprises a cylindrical structure, wherein a first gear and a second gear meshing with each other are arranged inside the cylindrical structure, an adjusting handle is extended into the cylindrical structure to drive the first gear to rotate, clamping screws with opposite thread rotation directions are fixed on both sides of the second gear, and a clamping slider is matched with a thread on each clamping screw, and the two clamping sliders are driven to move closer to or away from each other by the adjusting handle; a fixing head is arranged at one end of the clamping slider, and the fixing head can extend out of the cylindrical structure and be clamped with a clamping groove on the valve seat ring; The telescopic support includes a support platform, which is rotatably matched with the lifting mechanism through a bearing hole. The lifting mechanism includes a lifting nut, the bottom end of the lifting nut is matched with the cylindrical structure thread, and the top end is matched with a rotating wrench. The rotating wrench drives the lifting nut to rotate to realize the lifting of the cylindrical structure.

2. A valve seat removal tool according to claim 1, characterized in that: The support platform is provided with telescopic legs on its circumference, the bearing hole is provided at the center of the support platform, and the bearing hole is interference fit with the outer ring of the rolling bearing.

3. A valve seat removal tool according to claim 2, characterized in that: The inner ring of the rolling bearing is interference fit with the outer ring of the lifting nut. The bottom end of the lifting nut is open and provided with a fixed end internal thread, which is matched with the peripheral side of the top end of the cylindrical structure through the fixed end internal thread.

4. A valve seat removal tool according to claim 2, characterized in that: The length of the telescopic leg is adjusted by a locking knob, and a flexible base is provided at the bottom end of the telescopic leg.

5. A valve seat removal tool according to claim 3, characterized in that: The top of the cylindrical structure is open and provided with a movable end external thread, and the movable end external thread cooperates with the fixed end internal thread.

6. A valve seat removal tool according to claim 1, characterized in that: The adjustment handle comprises a rotating shaft, which is rotationally matched with the side wall of the cylindrical structure and fixedly connected with the first gear. One end of the adjustment handle extends out of the cylindrical structure to drive the first gear to rotate.

7. A valve seat removal tool according to claim 6, characterized in that: The second gear is meshed with the lower part of the first gear. One end of the clamping screws on both sides of the second gear is fixed at the center of the second gear, and the other end is rotatably matched with the inner wall of the cylindrical structure.

8. A valve seat removal tool according to claim 7, characterized in that: The bottom of the cylindrical structure is a slider base, and the clamping slider cooperates with a slide groove on the slider base.

9. The valve seat removal tool according to claim 1, characterized in that: It also includes a locking block. The cylindrical structure has a hole, and one end of the locking block is used to pass through the hole and engage with the first gear.

10. A valve seat ring disassembly method, characterized in that: A valve seat removal tool as claimed in any one of claims 1 to 9 is used, comprising the following steps: A clamping groove is machined on the valve seat ring, and the telescopic support is placed on the combustion chamber surface of the cylinder head. The telescopic support leg is adjusted to align the clamping slide block with the clamping groove. The first gear, the second gear, and the clamping screw are driven to rotate by the adjusting handle. The clamping slide blocks on both sides drive the seat ring fixing head to engage with the clamping groove, and the locking block engages with the first gear to lock. The rotating wrench is turned to drive the lifting nut to rotate, thereby raising the lifting nut and pulling out the valve seat ring.

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