Cylinder cover valve seat dismounting device for four exhaust valves of low-speed machine

Abstract

The invention provides a cylinder cover valve seat dismounting device for four exhaust valves of a low-speed machine. The cylinder cover valve seat dismounting device comprises a valve seat fixing part, an auxiliary beam, a guide connecting rod and a hydraulic telescopic part. And through the arrangement of the valve seat connecting part, the borne acting force can be evenly distributed, and damage to the cylinder cover is avoided. The auxiliary beam is horizontally arranged on the plane of the cylinder cover, it is guaranteed that the valve seat is stressed in the vertical direction, it is guaranteed that the valve seat is not inclined when stressed in the dismounting process, and the cylinder cover is prevented from being pulled. And through the arrangement of the auxiliary beam, the contact area with the cylinder cover is increased, the acting force of the hydraulic telescopic part is dispersed, and damage to the cylinder cover can also be avoided. And through the arrangement of the guide connecting rod, it is guaranteed that the valve seat is disassembled in the axial direction of the guide connecting rod, it is guaranteed that the disassembling track is fixed, and the cylinder cover is prevented from being damaged after the disassembling track deviates. Therefore, the disassembly of the valve seat can be quickly completed, and meanwhile, the damage to the cylinder cover can be avoided.

Description

Technical Field

[0001] This application relates to the field of marine low-speed engine maintenance technology, and more specifically, to a cylinder head valve seat disassembly device for a low-speed engine's four exhaust valves. Background Technology

[0002] In marine propulsion systems, the performance requirements for diesel engines are becoming increasingly stringent, demanding not only economic efficiency but also energy conservation and environmental protection. To further improve the performance and fuel economy of low-speed diesel engines while meeting the needs of energy conservation and emission reduction, a certain main engine manufacturer has redesigned the cylinder head of its existing low-speed engine with a single exhaust valve, replacing the central single exhaust valve with a four-array exhaust valve design. This optimized design of the cylinder head exhaust valve structure effectively increases the exhaust flow area and improves the scavenging quality of the exhaust valves, thereby improving the combustion performance of the main engine and reducing emissions.

[0003] In a four-valve cylinder head structure, the cylinder head, as a core component, primarily functions to seal the cylinder. It integrates key components such as the main injector, pilot fuel injector, exhaust valve, starting valve, indicator valve, and cylinder head cooling water system. Among these, the exhaust valve, as one of the complex and precision components of the cylinder head, plays a crucial role in expelling exhaust gases from the cylinder after the engine cylinder has completed its expansion and power stroke. The exhaust valve seat, as a core component of the exhaust valve, not only handles the reciprocating stroke of the exhaust valve but also protects the cylinder head cooling water chamber by sealing it.

[0004] When the cylinder head exhaust valve does not meet the sealing requirements, resulting in cylinder head coolant leakage into the combustion chamber, the exhaust valve seat needs to be replaced to ensure the normal operation of the low-speed engine.

[0005] In the existing technology, the valve seat is removed by knocking or other methods, which can easily damage the cylinder head during the disassembly process, and in severe cases, cause the cylinder head to be scrapped.

[0006] In summary, there is an urgent need for a cylinder head valve seat disassembly device for low-speed engine four exhaust valves, which can quickly and conveniently disassemble the valve seat. Summary of the Invention

[0007] The purpose of this application is to provide a cylinder head valve seat disassembly device for a low-speed engine four-valve exhaust valve, which can quickly and conveniently disassemble the valve seat, thereby saving disassembly time and improving work efficiency.

[0008] This application provides a cylinder head valve seat disassembly device for a low-speed engine four-exhaust valve, comprising: a valve seat fixing part, including a fixing block and a push plate, wherein the fixing block is disposed in the inner cavity of the valve seat, and the top surface of the fixing block is used to abut against the inner end face of the valve seat, a first through hole is provided at the center of the fixing block, and the push plate is coaxially disposed at the bottom of the fixing block; used to push the fixing block to abut against the end face of the valve seat.

[0009] An auxiliary beam is used to be mounted on the end face of the cylinder head after it is inverted, and a second through hole is provided on the auxiliary beam;

[0010] A guide rod is connected to the push plate and located at the center of the push plate. The guide rod passes upward through the first through hole and the second through hole in sequence to connect the auxiliary beam, the valve seat fixing part and the valve seat.

[0011] A hydraulic telescopic part is provided on the top of the auxiliary beam, and the bottom surface of the hydraulic telescopic part abuts against the top surface of the auxiliary beam; the hydraulic telescopic part is sleeved on the guide rod, and the position of the hydraulic telescopic part on the guide rod is fixed.

[0012] The valve seat is disassembled by the hydraulic telescopic part abutting against the auxiliary beam, causing the guide rod to move upward relative to the auxiliary beam, which in turn moves the valve seat fixing part upward. The valve seat connection part is designed to evenly distribute the force, preventing damage to the cylinder head. By placing the auxiliary beam horizontally on the plane of the cylinder head after it has been inverted, the valve seat is ensured to bear force vertically, preventing tilting during disassembly and thus avoiding damage to the cylinder head. Furthermore, the auxiliary beam increases the contact area with the cylinder head, dispersing the force from the hydraulic telescopic part and also preventing damage to the cylinder head. The guide rod ensures that the valve seat is disassembled along its axial direction, maintaining a fixed disassembly trajectory and preventing damage to the cylinder head due to trajectory deviation. Therefore, this application allows for rapid valve seat disassembly while preventing damage to the cylinder head.

[0013] In one feasible embodiment, the guide rod is provided with a fastening bolt, which secures the hydraulic telescopic part to the guide rod.

[0014] In one feasible embodiment, the push plate is fixedly connected to the guide rod.

[0015] In another possible implementation, the push plate is threadedly connected to the guide rod, facilitating disassembly and storage, or allowing for the replacement of push plates of different diameters as needed.

[0016] In one feasible embodiment, the upper surface of the push plate is provided with a plurality of claws, each claw having an L-shaped structure, each claw including a long rod and a short rod fixedly connected, each short rod being arranged radially along the push plate, the bottom surface of the short rod being fixedly connected to the push plate, each long rod being arranged axially along the push plate, and the long rod extending upward and engaging with the side of the fixing block.

[0017] It should be noted that the claw is a one-piece molded structure, which can ensure that its rigidity meets the requirements, thereby limiting the position of the fixing block.

[0018] It should also be noted that the diameter of the fixing block is smaller than the diameter of the valve seat cavity, so that the claw can extend into the gap between the fixing block and the valve seat.

[0019] In one feasible embodiment, the fixing block has multiple slots on its periphery, the number of which is equal to the number of claws. Each slot includes a first strip groove and a second strip groove, which connect to form an L-shaped slot. The first strip groove is arranged radially along the fixing block, and the second strip groove is arranged axially along the fixing block. The claws are respectively embedded in their corresponding slots. After the push plate moves upward, the short rod is pressed against the first strip groove, and the long rod is pressed against the second strip groove. By attaching the claws to the slots, the stability of the fixing block and valve seat during disassembly is ensured. When the gap between the fixing block and the valve seat sidewall is too small, the claws can be inserted into the strip grooves. Considering the fixed connection between the push plate and the guide rod, rotation is prevented. The claws, when engaged in the strip grooves, restrict rotation between the fixing block and the valve seat, thus preventing increased friction and damage caused by rotation between the top surface of the fixing block and the end face of the valve seat.

[0020] It should be noted that the length of the long rod is less than or equal to the height of the fixed block.

[0021] In one feasible embodiment, the width of the end of the auxiliary beam is smaller than the width of the middle portion of the auxiliary beam, and the middle portion of the auxiliary beam contacts the hydraulic telescopic part, which can ensure the force-bearing area while reducing the weight of the auxiliary beam.

[0022] In one feasible embodiment, the hydraulic telescopic unit includes a sleeve, a piston, and a telescopic rod. The sleeve is fitted onto the guide rod, and end caps are provided at both ends of the sleeve, forming a sealed cavity inside the sleeve. The piston is disposed within the cavity, dividing the cavity into a rod-side cavity and a rodless cavity. The rodless cavity is located above the rod-side cavity. The telescopic rod is vertically arranged within the rod-side cavity, with one end connected to the piston and the other end extending downwards to abut against the auxiliary beam.

[0023] It should be noted that the hydraulic telescopic part includes multiple telescopic rods, and the multiple telescopic rods are evenly distributed around the guide connecting rod. By setting multiple telescopic rods, the force of the hydraulic telescopic part can be evenly output to the auxiliary beam.

[0024] In one feasible embodiment of the hydraulic telescopic unit, an oil passage is provided on the side wall of the rodless chamber for inputting or outputting hydraulic oil. After hydraulic oil is introduced into the rodless chamber through the oil passage, the pressure inside the rodless chamber increases. Under the action of the hydraulic oil pressure, the piston pushes the telescopic rod to extend and abut against the auxiliary beam. As the telescopic rod continues to extend, the guide connecting rod moves upward, thereby driving the push plate, the fixing block, and the valve seat to move upward, completing the disassembly of the valve seat.

[0025] It should be noted that a sealing element is provided between the telescopic rod and the sleeve. The sealing element is a dustproof ring or a U-shaped sealing ring to prevent hydraulic oil leakage or external impurities from entering the cavity.

[0026] In one feasible embodiment, a buffer is provided inside the sleeve to reduce the impact of the piston on the end cap by limiting the discharge rate of hydraulic oil when the telescopic rod approaches the end of its stroke.

[0027] It should be noted that the buffer element can be a buffer sleeve or a throttling orifice located at both ends of the sleeve.

[0028] Compared with the prior art, the beneficial effects of this application are as follows:

[0029] In this application's technical solution, the hydraulic telescopic part abuts against the auxiliary beam, causing the guide rod to move upward relative to the auxiliary beam, which in turn moves the valve seat fixing part upward, completing the valve seat disassembly. The valve seat connection part's design evenly distributes the applied force, preventing damage to the cylinder head. By horizontally positioning the auxiliary beam on the inverted plane of the cylinder head, the valve seat is ensured to bear force vertically, preventing tilting during disassembly and thus avoiding damage to the cylinder head. Furthermore, the auxiliary beam increases the contact area with the cylinder head, dispersing the force from the hydraulic telescopic part and also preventing damage to the cylinder head. The guide rod ensures the valve seat is disassembled along its axial direction, maintaining a fixed disassembly trajectory and preventing damage to the cylinder head due to trajectory deviation. Therefore, this application can quickly disassemble the valve seat while avoiding damage to the cylinder head. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cylinder head valve seat disassembly device for the low-speed engine four exhaust valves according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the fixing block in the cylinder head valve seat disassembly device for the low-speed engine four exhaust valves according to an embodiment of the present invention.

[0032] The reference numerals in the attached figures are explained as follows:

[0033] 1. Guide rod; 2. Fastening bolt; 3. Hydraulic telescopic part; 4. Auxiliary beam; 5. Claw; 6. Push plate; 7. Valve seat; 8. Fixing block. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] See Figure 1 and Figure 2 This application provides a cylinder head valve seat disassembly device for a low-speed engine with four exhaust valves, comprising:

[0039] The valve seat fixing part includes a fixing block 8 and a push plate 6. The fixing block 8 is disposed in the inner cavity of the valve seat 7, and the top surface of the fixing block 8 is used to abut against the inner end face of the valve seat 7. A first through hole is provided at the center of the fixing block 8. The push plate 6 is coaxially disposed at the bottom of the fixing block 8 and is used to push the fixing block 8 to abut against the end face of the valve seat 7.

[0040] It should be noted that the valve seat is a cylinder with a built-in cavity. The cavity is a cylindrical cavity with an opening at the bottom. The valve seat includes a top plate and a side plate, and the bottom surface of the valve seat top plate is defined as the inner end surface.

[0041] Auxiliary beam 4 is located at the disassembly port of the cylinder head, and a second through hole is provided on the auxiliary beam 4;

[0042] Guide rod 1 is connected to push plate 6, and the connection position is located at the center of push plate 6. Guide rod 1 passes upward through the first through hole and the second through hole in sequence to connect the auxiliary beam 4, the valve seat fixing part and the valve seat 7.

[0043] A hydraulic telescopic part 3 is disposed on the top of the auxiliary beam 4, and the bottom surface of the hydraulic telescopic part 3 abuts against the top surface of the auxiliary beam 4; the hydraulic telescopic part 3 is sleeved on the guide rod 1, and the position of the hydraulic telescopic part 3 on the guide rod 1 is fixed.

[0044] Since the hydraulic telescopic part 3 abuts against the auxiliary beam 4 and is fixed on the guide rod 1, when the hydraulic telescopic part 3 extends, it can drive the guide rod 1 to move upward relative to the auxiliary beam 4. During this movement, the guide rod 1 drives the valve seat fixing part to move upward, thereby driving the valve seat 7 to move upward to complete the disassembly of the valve seat 7. The valve seat 7 connection part ensures that the force on the valve seat is evenly distributed, preventing damage to the cylinder head. By placing the auxiliary beam 4 horizontally on the inverted cylinder head surface, the valve seat 7 is ensured to be subjected to force in a direction perpendicular to the cylinder head surface, ensuring that the valve seat does not tilt during disassembly and preventing damage to the cylinder head. Furthermore, the auxiliary beam 4 increases the contact area with the cylinder head, dispersing the force of the hydraulic telescopic part 3, which also prevents damage to the cylinder head. The guide rod 1 ensures that the valve seat 7 moves upward along the axial direction of the guide rod 1 during disassembly, with the direction of movement remaining fixed, preventing damage to the cylinder head due to deviation in the direction of movement. Therefore, this application can quickly disassemble the valve seat 7 while avoiding damage to the cylinder head.

[0045] In one feasible embodiment, the guide rod 1 is provided with a fastening bolt 2, which secures the hydraulic telescopic part 3 to the guide rod 1.

[0046] In one feasible embodiment, the push plate 6 is fixedly connected to the guide rod 1.

[0047] In another possible implementation, the push plate 6 is threadedly connected to the guide rod 1, which facilitates disassembly and storage, or allows for the replacement of push plates 6 with different diameters as needed.

[0048] In one feasible embodiment, the upper surface of the push plate 6 is provided with a plurality of claws 5, each claw 5 having an L-shaped structure, each claw 5 including a long rod and a short rod fixedly connected, each short rod being arranged radially along the push plate 6, the bottom surface of the short rod being fixedly connected to the push plate 6, each long rod being arranged axially along the push plate 6, and the long rod extending upward and locking onto the side of the fixing block 8.

[0049] It should be noted that the claw 5 is a one-piece molded structure, which can ensure that its rigidity meets the requirements, thereby limiting the position of the fixing block 8.

[0050] It should also be noted that the diameter of the fixing block 8 is smaller than the diameter of the inner cavity of the valve seat 7, so that the long rod of the claw 5 can be accommodated and can extend into the gap between the fixing block 8 and the valve seat 7.

[0051] In one feasible embodiment, the outer label of the fixing block 8 is provided with multiple slots, the number of which is equal to the number of the claws 5 and their positions correspond one-to-one. Each slot includes a first strip groove and a second strip groove, which connect to form an L-shaped slot. The first strip groove is arranged radially along the fixing block 8, and the second strip groove is arranged axially along the fixing block 8. The claws 5 are respectively embedded in their corresponding slots. After the push plate 6 moves upward into position, the short rod is pressed against the first strip groove, and the long rod is pressed against the second strip groove, meaning the claws 5 are respectively embedded in their corresponding slots. By embedding the claws 5 in the slots, the stability of the fixing block 8 and the valve seat 7 during disassembly can be ensured. Simultaneously, when the gap between the fixing block 8 and the side wall of the valve seat 7 is too small, the claws 5 can be inserted into the strip grooves. The push plate 6 is fixedly connected to the guide rod 1, so the push plate 6 will not rotate relative to the guide rod 1. Thus, after the claw 5 is engaged in the slot, it can restrict the relative rotation between the fixing block 8 and the valve seat 7, thereby preventing the top surface of the fixing block 8 and the end surface of the valve seat 7 from rotating and causing friction damage between them.

[0052] It should be noted that the length of the long rod is less than or equal to the height of the fixing block 8.

[0053] In one feasible embodiment, the width of the end of the auxiliary beam 4 is smaller than the width of the middle part of the auxiliary beam 4, and the middle part of the auxiliary beam 4 contacts the hydraulic telescopic part 3, which can ensure the force-bearing area while reducing the weight of the auxiliary beam 4.

[0054] In one feasible embodiment, the hydraulic telescopic unit 3 includes a sleeve, a piston, and a telescopic rod. The sleeve is fitted onto the guide connecting rod 1, and end caps are provided at both ends of the sleeve, forming a sealed cavity inside the sleeve; the piston is disposed in the cavity, dividing the cavity into a rod-side cavity and a rodless cavity; the rodless cavity is located above the rod-side cavity; the telescopic rod is arranged vertically in the rod-side cavity, one end of the telescopic rod is connected to the piston, and the other end of the telescopic rod extends downward and abuts against the auxiliary beam 4.

[0055] It should be noted that the hydraulic telescopic part 3 includes multiple telescopic rods, and the multiple telescopic rods are evenly distributed around the guide connecting rod 1. By setting multiple telescopic rods, it can be ensured that the force of the hydraulic telescopic part 3 is evenly applied to the auxiliary beam 4.

[0056] In one possible implementation of the hydraulic telescopic section 3, an oil passage is provided on the side wall of the rodless chamber for inputting or outputting hydraulic oil. After hydraulic oil is introduced into the rodless chamber through the oil passage, the pressure inside the rodless chamber increases. Under the action of the hydraulic oil pressure, the piston pushes the telescopic rod to extend and abut against the auxiliary beam 4. The telescopic rod continues to extend, driving the guide connecting rod 1 to move upward, thereby causing the push plate 6, the fixing block 8, and the valve seat 7 to move upward, completing the disassembly of the valve seat 7.

[0057] It should be noted that a sealing element is provided between the telescopic rod and the sleeve. The sealing element is a dustproof ring or a U-shaped sealing ring to prevent hydraulic oil leakage or external impurities from entering the cavity.

[0058] In one feasible embodiment, a buffer is provided inside the sleeve to reduce the impact of the piston on the end cap by limiting the discharge rate of hydraulic oil when the telescopic rod approaches the end of its stroke.

[0059] It should be noted that the buffer element can be a buffer sleeve or a throttling orifice located at both ends of the sleeve.

[0060] This application includes the following steps when disassembling the valve seat 7:

[0061] S1. Place the auxiliary beam 4 on the top of the cylinder head.

[0062] S2. Place the fixing block 8 in the inner cavity of the valve seat 7, fix the push plate 6 to the bottom end of the guide rod 1, and insert the top end of the guide rod 1 into the fixing block 8, the valve seat 7 and the auxiliary beam 4 in sequence, so that the axes of the push plate 6, the fixing block 8, the valve seat 7 and the auxiliary beam 4 are all on the same straight line.

[0063] S3. Insert the hydraulic telescopic part 3 into the top of the guide rod 1 so that the hydraulic telescopic part 3 is located on the upper part of the auxiliary beam 4, and install the fastening bolt 2 at the top of the guide rod 1 to fix the hydraulic telescopic part 3 on the guide rod 1.

[0064] S4. Control the hydraulic telescopic part 3 to pressurize it to 200 bar. After the piston rod is subjected to the pressure from the hydraulic oil, it drives the telescopic rod to extend onto the auxiliary beam 4. The telescopic rod continues to extend, and the guide connecting rod 1 moves upward, thereby driving the push plate 6, the fixing block 8 and the valve seat 7 to move upward, completing the disassembly of the valve seat 7.

[0065] S5. After completing the disassembly and installation of valve seat 7, remove fastening bolt 2, hydraulic telescopic part 3, and valve seat fixing part in sequence, and repeat S1 to S4 to disassemble the remaining valve seat 7 in sequence.

[0066] In summary, since the hydraulic telescopic part 3 abuts against the auxiliary beam 4 and is fixed on the guide rod 1, when the hydraulic telescopic part 3 extends, it can drive the guide rod 1 to move upward relative to the auxiliary beam 4. During this movement, the guide rod 1 drives the valve seat fixing part to move upward, thereby driving the valve seat 7 to move upward to complete the disassembly of the valve seat 7. The valve seat 7 connection ensures that the force on the valve seat is evenly distributed, preventing damage to the cylinder head. By horizontally placing the auxiliary beam 4 on the inverted cylinder head surface, the valve seat 7 is ensured to be subjected to force in a direction perpendicular to the cylinder head surface, ensuring that the valve seat does not tilt during disassembly and preventing damage to the cylinder head. Furthermore, the auxiliary beam 4 increases the contact area with the cylinder head, dispersing the force of the hydraulic telescopic part 3, which also prevents damage to the cylinder head. The guide rod 1 ensures that the valve seat 7 moves upward along the axial direction of the guide rod 1 during disassembly, with the direction of movement remaining fixed, preventing damage to the cylinder head due to deviation in the direction of movement. Therefore, this application can quickly disassemble the valve seat 7 while avoiding damage to the cylinder head.

[0067] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A cylinder head valve seat disassembly device for a low-speed engine with four exhaust valves, characterized in that, include: The valve seat fixing part includes a fixing block (8) and a push plate (6). The fixing block (8) is disposed in the inner cavity of the valve seat (7), and the top surface of the fixing block (8) is used to abut against the inner end face of the valve seat (7). A first through hole is provided at the center of the fixing block (8). The push plate (6) is coaxially disposed at the bottom of the fixing block (8). An auxiliary beam (4) is used to be mounted on the end face of the cylinder head after it is turned upside down, and a second through hole is provided on the auxiliary beam (4); Guide rod (1), the guide rod (1) is connected to the push plate (6) and is located at the center of the push plate (6). The guide rod (1) passes through the first through hole and the second through hole in sequence to connect the auxiliary beam (4), the valve seat (7) and the valve seat fixing part. A hydraulic telescopic part (3) is provided on the top of the auxiliary beam (4), and the bottom surface of the hydraulic telescopic part (3) abuts against the top surface of the auxiliary beam (4); the hydraulic telescopic part (3) is sleeved on the guide rod (1), and the position of the hydraulic telescopic part (3) on the guide rod (1) is fixed.

2. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 1, characterized in that, The guide rod (1) is provided with a fastening bolt (2), which fixes the hydraulic telescopic part (3) to the guide rod (1).

3. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 1, characterized in that, The push plate (6) is threadedly connected to the guide rod (1).

4. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 1, characterized in that, The upper surface of the push plate (6) is provided with multiple claws (5). Each claw (5) has an L-shaped structure and includes a long rod and a short rod that are fixedly connected. Each short rod is arranged radially along the push plate (6) and the bottom surface of the short rod is fixedly connected to the push plate (6). Each long rod is arranged axially along the push plate (6) and extends upward and is locked onto the side of the fixing block (8).

5. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 4, characterized in that, The diameter of the fixing block (8) is smaller than the diameter of the inner cavity of the valve seat (7).

6. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 4, characterized in that, The fixing block (8) has multiple slots on its periphery, and the number of slots is equal to the number of claws (5); the claws (5) are respectively embedded in the corresponding slots.

7. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 1, characterized in that, The width of the middle part of the auxiliary beam (4) is greater than the width of the end of the auxiliary beam (4).

8. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 1, characterized in that, The hydraulic telescopic part (3) includes a sleeve, a piston, and a telescopic rod; the sleeve is sleeved on the guide connecting rod (1), and end caps are provided at both ends of the sleeve, and a sealed cavity is formed inside the sleeve; The piston is disposed in the cavity, and the piston divides the cavity into a rod cavity and a rodless cavity; the rodless cavity is disposed in the upper part of the rod cavity; the telescopic rod is arranged vertically in the rod cavity, one end of the telescopic rod is connected to the piston, and the other end of the telescopic rod extends downward and abuts against the auxiliary beam (4).

9. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 8, characterized in that, The hydraulic telescopic part (3) includes multiple telescopic rods, and the multiple telescopic rods are evenly distributed around the guide link (1).

10. The cylinder head valve seat disassembly device for the four exhaust valves of a low-speed engine according to claim 8, characterized in that, An oil passage is provided on the side wall of the rodless cavity, which is used for inputting or outputting hydraulic oil.

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