Auxiliary equipment and method for maintenance of diesel engine and heavy oil engine rack

Abstract

The invention relates to the technical field of maintenance of large electromechanical equipment, in particular to auxiliary maintenance equipment and method for a diesel and heavy oil engine rack. According to the technical scheme, the device comprises a reference positioning mechanism, a leveling platform mechanism and a precise grinding mechanism; the reference positioning mechanism comprises a lower positioning disc and an upper positioning disc which are connected through a positioning mandrel, and reference reconstruction is achieved through an original sealing face of a rack cylinder sleeve. The leveling platform mechanism realizes fine leveling of a mounting plane through a plane adjusting screw and a plane adjusting plate; and the precise grinding mechanism drives a pneumatic grinding machine to rotate through a precise rotating device, so that the field precise grinding of the sealing surface of the rack is realized. The device is compact in structure, easy and convenient to operate and capable of completing repairing work efficiently and precisely under the field condition, the maintenance cost and the downtime are remarkably reduced, and the problems that in the prior art, due to the large size, a large diesel and heavy oil engine rack is difficult to return to a factory for maintenance and high in cost are solved. And on-site maintenance is lack of a high-precision reference and a special tool.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-scale electromechanical equipment maintenance, and in particular to a heavy oil engine rack maintenance auxiliary device and method. BACKGROUND

[0002] Technical difficulties of on-site maintenance of large heavy oil engine rack sealing surface. Medium-sized heavy oil engines are widely used as power cores in land and marine generator sets and marine propulsion systems. After long-term high-load operation, the combined sealing surface of the cast iron or cast steel main rack and the cylinder cover will be damaged due to factors such as corrosion, cavitation, high-temperature oxidation, and mechanical vibration, resulting in sealing failure of the combined surface, causing gas or oil leakage, and seriously affecting the safe and stable operation of the unit, which needs to be repaired.

[0003] The existing technology mainly relies on traditional mechanical processing methods for repair of such damage. When the damage is slight, manual scraping, grinding, and other manual finishing methods may be attempted. For more serious damage, the entire rack is generally disassembled from the engine, hoisted, and transported to a factory or large maintenance workshop with large vertical lathes, boring machines, or special grinding machines for processing. The technical principle is to rely on the high-precision bed rail and spindle system of these large fixed machines to re-establish a processing reference, thereby turning or grinding the sealing surface of the rack to restore its flatness and surface finish.

[0004] However, the above existing technical solutions have significant limitations. Due to the large size and heavy weight of the heavy oil engine main rack, disassembling and transporting it to a professional repair factory not only has a complicated process and a long cycle, but also incurs high hoisting, transportation, and machine table fees, resulting in a sharp increase in comprehensive repair costs. More importantly, many generator sets or ships have limited installation site space or are located in remote areas, and do not have the operating conditions for rack disassembly and long-distance transportation, making it difficult to implement the repair scheme in the factory, or even completely unfeasible, ultimately causing the unit to be out of service for a long time, resulting in significant economic losses. SUMMARY

[0005] The present application aims to solve the problems in the background art by providing a heavy oil engine rack maintenance auxiliary device and method.

[0006] In a first aspect, the present application provides a heavy oil engine rack maintenance auxiliary device, comprising a lower positioning disc, a positioning core shaft, and an upper positioning disc. The lower positioning disc is in contact with the lower sealing surface of the engine rack through an O-ring and is fixed to the engine rack by screws. The upper positioning disc is in contact with the upper sealing surface of the engine rack through a positioning support block and is fixed to the engine rack by connecting screws. The positioning core shaft connects the lower positioning disc and the upper positioning disc. The upper positioning disc is provided with installation leveling support blocks and a plane adjusting plate, the installation leveling support blocks are fixed to the upper positioning disc through screws three, the plane adjusting plate is installed on the upper positioning disc through plane adjusting screws, and the plane adjusting plate is provided with a precision rotating device; The precision rotating device is connected with a grinding machine support block, the grinding machine support block is fixed to the precision rotating device through a screw one, the grinding machine support block is connected with a feed amount adjusting plate, and the feed amount adjusting plate is fixed to the grinding machine support block through a screw two.

[0007] Optionally, the feed amount adjusting plate is threadedly connected with a feed amount adjusting screw, and the end of the grinding machine support block is provided with a pneumatic grinding machine through the annular positioning ring and the mounting mechanism.

[0008] Optionally, the lower positioning disc is provided with a sealing groove for accommodating the O-shaped ring and a threaded hole or a light hole for penetrating and connecting the screw four.

[0009] Optionally, the plane adjusting plate is connected with the upper positioning disc through at least three plane adjusting screws distributed in a circumferential direction, so as to realize fine adjustment of the flatness of the plane adjusting plate, the positioning support blocks are a plurality of and arranged in an annular array on the upper positioning disc, and the contact surface of the positioning support block and the engine rack is an arc surface.

[0010] Optionally, the mounting mechanism comprises a limiting block for pressing and fixing the pneumatic grinding machine and an adjusting ring for driving the limiting block to move, the inner wall of the adjusting ring is provided with a driving ring which rotates together in the annular positioning ring, an arc-shaped sliding groove is formed in the inside of the driving ring for the limiting block on one end of a sliding shaft to slide, and the arc-shaped sliding groove cooperates with the sliding shaft to drive the limiting block to move, and the contact surface of the sliding shaft and the pneumatic grinding machine is provided with an antiskid fixed veneer.

[0011] Optionally, the mounting mechanism further comprises a positioning block one for limiting the adjusting ring, and the outer wall of the positioning block one slides in the adjusting ring and the adjusting plate on one side and is sleeved with a spring two on the other side, one end of the spring two is fixed in the adjusting ring, and the other end is fixed to the outer wall of the limiting ring one in the middle of the positioning block one.

[0012] Optionally, the grinding machine support block is internally slidably provided with two L-shaped limiting plates, and the top turning part of the L-shaped limiting plate is matched with the top of the pneumatic grinding machine, and the adjusting ring is internally provided with a limiting mechanism for fixing the L-shaped limiting plate.

[0013] Optionally, the limiting mechanism comprises a positioning block two for fixing the L-shaped limiting plate, and an arc-shaped push plate for driving the positioning block two to move, the arc-shaped push plate is fixed in the adjusting ring, the outer wall of the positioning block two slides in the limiting hole and the annular positioning ring, the outer wall of the other side is fixed with a slide rod, and a groove is formed in the slide rod for the arc-shaped push plate to slide.

[0014] Optionally, the limiting mechanism further comprises a spring one for driving the slide rod and the positioning block two to reset, one end of the spring one is fixed in the annular positioning ring, and the other end is fixed on the outer wall of the limiting ring two at one end of the positioning block two.

[0015] In the second aspect, the application provides a method for using a heavy oil engine rack maintenance auxiliary device, which is applied to the heavy oil engine rack maintenance auxiliary device in the first aspect, and comprises the following steps: S1, the lower positioning disc is attached to the lower sealing surface of the engine rack through an O-shaped ring, and is fixed by using the screw four; the positioning core shaft is installed on the lower positioning disc; the upper positioning disc is sleeved on the positioning core shaft, and is in contact with the upper sealing surface of the engine rack through the positioning support block, and is fixed by using the connecting screw; S2, the leveling support block and the plane adjusting plate are installed on the upper positioning disc; the flatness of the plane adjusting plate is finely adjusted by rotating at least three plane adjusting screws which are distributed in a circumferential direction; S3, the precise rotation device is installed on the plane adjusting plate with fine flatness; the grinding machine support block, the feed amount adjusting plate and the pneumatic grinding machine are sequentially installed on the precise rotation device; S4, the feed amount of the grinding wheel piece of the pneumatic grinding machine is controlled by rotating the feed amount adjusting screw on the feed amount adjusting plate, the pneumatic grinding machine is started, and the engine rack sealing surface is ground by rotating the precise rotation device.

[0016] In summary, the application has at least one of the following beneficial technical effects: The application avoids the necessity of disassembling the huge and heavy rack to return to the factory, fundamentally solves the core pain points of high cost, long cycle and limited operation conditions caused by factory repair, greatly saves the hoisting, transportation and large machine tool use cost, and effectively shortens the unit downtime.

[0017] Further, the reference reconstruction system composed of the lower positioning disc, the positioning core shaft and the upper positioning disc can quickly and accurately restore the machining reference line coinciding with the original cylinder sleeve center line; in combination with the fine leveling platform and the precise rotation device, the flatness and the centring of the grinding track are ensured, so that a high-precision sealing plane can be machined on site, and the repair quality is reliable.

[0018] Finally the device structure is modular, easy to assemble, low requirement for the site environment. Its unique grinding machine clamping and linkage locking mechanism ensures the stability of the tool during processing, prevents vibration and displacement. The whole method flow is clear, the skill requirement of the operator is relatively reduced, the safety and success rate of maintenance operation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure schematic diagram of a diesel heavy oil engine rack maintenance auxiliary equipment is given; Figure 2 The structure schematic diagram of the upper positioning disc is given; Figure 3 The structure schematic diagram of the installation leveling support block is given; Figure 4 The structure schematic diagram of the positioning support block is given; Figure 5 The structure schematic diagram of the fastening screw is given; Figure 6 The structure schematic diagram of the plane adjusting plate is given; Figure 7 The structure schematic diagram of the lower positioning disc structure is given; Figure 8 The structure schematic diagram of the positioning mandrel is given; Figure 9 The structure schematic diagram of the precision rotating device assembly is given; Figure 10 The structure schematic diagram of the pneumatic grinding machine is given; Figure 11 The structure schematic diagram of the feed amount adjusting plate is given; Figure 12 The structure schematic diagram of the feed amount adjusting bolt is given; Figure 13 The structure schematic diagram of the L-shaped limiting plate is given; Figure 14 The structure schematic diagram of the annular positioning ring is given; Figure 15 The structure schematic diagram of the adjusting ring internal structure is given; Figure 16 The structure schematic diagram of the Figure 15 The structure schematic diagram of the A place in the middle is given; Figure 17 The structure schematic diagram of the Figure 15 The structure schematic diagram of the B place in the middle is given; Figure 18 The use method flow chart of a diesel heavy oil engine rack maintenance auxiliary equipment is given.

[0020] Mark No. 1, lower positioning disc; 2, positioning mandrel; 3, upper positioning disc; 4, positioning support block; 5, connecting screw; 6, precision rotating device; 7, grinding machine support block; 8, screw one; 9, feed amount adjusting screw; 10, feed amount adjusting plate; 11, pneumatic grinding machine; 12, screw two; 13, installation leveling support block; 14, plane adjusting screw; 15, plane adjusting plate; 16, screw three; 17, screw four; 18, O-ring; 19, engine frame; 20, L-shaped limiting plate; 21, limiting hole; 22, annular positioning ring; 23, adjusting plate; 24, adjusting ring; 25, driving ring; 26, arc-shaped sliding groove; 27, limiting clamping block; 28, sliding shaft; 29, limiting ring one; 30, positioning clamping block one; 31, arc-shaped push plate; 32, sliding rod; 33, spring one; 34, limiting ring two; 35, positioning clamping block two; 36, spring two. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0022] As shown in the drawings, Figure 1 Figure 12 As shown in the drawings, the auxiliary equipment for repairing the diesel heavy oil engine frame provided by the present application comprises a lower positioning disc 1 directly attached to the lower sealing surface of the engine frame 19 to establish a preliminary horizontal positioning reference, a positioning mandrel 2 that can be screwed into the center blind hole of the lower positioning disc 1 to realize rigid connection and central positioning, and an upper positioning disc 3 that is preliminarily aligned by being matched with the smooth cylindrical surface gap of the positioning mandrel 2 through the through hole; as an embodiment, one end of the positioning mandrel 2 is provided with external threads, which is screwed into the pre-set threaded hole in the center of the lower positioning disc 1 to realize fixed connection with the lower positioning disc 1; the other end of the positioning mandrel 2 is a smooth shaft, which passes through the center hole of the upper positioning disc 3 and is locked by a nut, so as to press and fix the upper positioning disc 3; the lower positioning disc 1 is in contact with the lower sealing surface of the engine frame 19 through the O-ring 18 and is fixed to the engine frame 19 by the screw four 17; the upper positioning disc 3 is in contact with the upper sealing surface of the engine frame 19 through the positioning support block 4 and is fixed to the engine frame 19 by the connecting screw 5; the positioning mandrel 2 connects the lower positioning disc 1 and the upper positioning disc 3. The installation leveling support block 13 is fixed to the upper positioning disc 3 by the screw three 16, and the plane adjusting plate 15 is installed on the upper positioning disc 3 by the plane adjusting screw 14; the precision rotating device 6 is installed on the plane adjusting plate 15. ​The precise rotating device 6 is connected with a grinding machine support block 7, the grinding machine support block 7 is fixed to the precise rotating device 6 through a screw 8, the grinding machine support block 7 is connected with a feed amount adjusting plate 10, the feed amount adjusting plate 10 is fixed to the grinding machine support block 7 through a screw 12; The feed amount adjusting plate 10 is threadedly connected with a feed amount adjusting screw 9, the end of the grinding machine support block 7 is connected with the pneumatic grinding machine 11 through the annular positioning ring 22 and the mounting mechanism; the lower positioning disc 1 is provided with a sealing groove for accommodating the O-ring 18, and a threaded hole or a light hole for penetrating and connecting the screw 17; the plane adjusting plate 15 is connected with the upper positioning disc 3 through at least three plane adjusting screws 14 which are distributed in a circumferential direction, so as to realize fine adjustment of the flatness of the plane adjusting plate 15; the positioning support blocks 4 are multiple and arranged in an annular array on the upper positioning disc 3, the contact surface of the positioning support blocks 4 and the engine frame 19 is an arc surface, and the following will be specifically described for the maintenance auxiliary equipment: In this embodiment, first, the lower positioning disc 1 is attached to the lower sealing surface of the cylinder sleeve of the engine frame 19 through the O-ring 18 at the bottom of the lower positioning disc 1, to form a seal and preliminarily center, and then the lower positioning disc 1 is preliminarily fixed by using the screw 17 to penetrate the pre-set hole position on the lower positioning disc 1. Then, the positioning mandrel 2 is installed on the lower positioning disc 1, to establish the central reference axis of the equipment. Then, the upper positioning disc 3 is sleeved on the positioning mandrel 2, and is in contact with the upper sealing surface of the cylinder sleeve of the engine frame through multiple positioning support blocks 4 arranged in an annular array, and is fixed by using the connecting screw 5, so as to complete the accurate centering and rigid installation of the entire grinding tool reference platform on the engine. Then, the leveling support block 13 and the plane adjusting plate 15 are installed on the upper positioning disc 3, and the flatness of the plane adjusting plate 15 can be finely adjusted by rotating at least three plane adjusting screws 14 which are distributed in a circumferential direction, to ensure that the precise rotating device 6 installed subsequently has a high level of rotating reference. The precise rotating device 6 is installed on the leveled plane adjusting plate 15, and the upper part thereof is connected with the grinding machine support block 7 through the screw 8. The feed amount adjusting plate 10 is fixed on the grinding machine support block 7 through the screw 12. During the grinding operation, the operator can accurately control the amount of downward feed of the grinding wheel piece of the pneumatic grinding machine 11 by rotating the feed amount adjusting screw 9 which is threadedly connected with the feed amount adjusting plate 10, to realize precise grinding of the sealing surface of the engine frame 19.

[0023] As 1- Figure 16As shown, the maintenance auxiliary equipment also includes an installation mechanism for installing and fixing the pneumatic grinder 11; as an embodiment, the installation mechanism includes a limiting block 27 for pressing and fixing the pneumatic grinder 11, and an adjusting ring 24 for driving the limiting block 27 to move, the inner wall of the adjusting ring 24 is provided with a driving ring 25 which rotates together in the annular positioning ring 22, the inside of the driving ring 25 is provided with an arc-shaped sliding groove 26 for the sliding of one end of the sliding shaft 28 and the limiting block 27, and the arc-shaped sliding groove 26 cooperates with the sliding shaft 28 to drive the limiting block 27 to move, and the contact surface between the sliding shaft 28 and the pneumatic grinder 11 is provided with an anti-skid fixed surface; The installation mechanism also includes a positioning block one 30 for limiting the adjusting ring 24, the outer wall of the positioning block one 30 slides in the inside of the adjusting ring 24 and the adjusting plate 23, and the outer wall of the other side is sleeved with a spring two 36, one end of the spring two 36 is fixed in the inside of the adjusting ring 24, and the other end is fixed on the outer wall of the limiting ring one 29 in the middle of the positioning block one 30, and the installation mechanism will be explained below: In this embodiment, when the pneumatic grinder 11 is installed, the body of the pneumatic grinder 11 is placed in the annular positioning ring 22 at the end of the grinder support block 7. In order to quickly and stably clamp the equipment, the operator can rotate the adjusting ring 24. The inner wall of the adjusting ring 24 is fixed with the driving ring 25, and the two rotate synchronously on the annular positioning ring 22. The arc-shaped sliding groove 26 inside the driving ring 25 will drive the sliding shaft 28 cooperating with it to produce radial movement, so as to push the limiting block 27 to move towards the center, until the anti-skid fixed surface at the front end of the limiting block 27 tightly presses the shell of the pneumatic grinder 11, and the clamping is completed. In order to ensure the stability of the clamping state and prevent the adjusting ring 24 from rotating accidentally, the equipment is provided with a limiting mechanism: when the adjusting ring 24 is rotated to the clamping position, the positioning block one 30 in the inside of the adjusting ring 24 is popped out under the elastic force of the spring two 36, and is clamped into the corresponding groove of the adjusting plate 23, so as to realize self-locking.

[0024] As shown in 1- Figure 17 As shown, the maintenance auxiliary equipment also includes two L-shaped limiting plates 20 for limiting the pneumatic grinder 11, and a limiting mechanism for fixing the two L-shaped limiting plates 20; as an embodiment, the inside of the grinder support block 7 is slidably provided with the two L-shaped limiting plates 20, and the top turning part of the L-shaped limiting plate 20 is in close contact with the top of the pneumatic grinder 11, and the inside of the adjusting ring 24 is provided with a limiting mechanism; The limiting mechanism includes a positioning block two 35 for fixing the L-shaped limiting plate 20, and an arc-shaped push plate 31 for driving the positioning block two 35 to move, the arc-shaped push plate 31 is fixed in the inside of the adjusting ring 24, the outer wall of the positioning block two 35 slides in the limiting hole 21 pre-set in the inside of the L-shaped limiting plate 20 and the inside of the annular positioning ring 22, and the other side of the outer wall is fixed with a sliding rod 32, and the inside of the sliding rod 32 is provided with a groove for the sliding of the arc-shaped push plate 31; The limiting mechanism also includes a spring 33 that drives the slide bar 32 and the positioning block 35 to reset. One end of the spring 33 is fixed inside the annular positioning ring 22, and the other end is fixed to the outer wall of the limiting ring 34 at one end of the positioning block 35. The limiting mechanism is described in detail below: In this embodiment, to further enhance the stability of the pneumatic grinder 11 during the grinding process and prevent it from tilting or shifting due to vibration, a top limiting mechanism is also provided. Two L-shaped limiting plates 20 are slidably installed inside the grinder support block 7, and their top bends can press down on the top of the pneumatic grinder 11. This limiting action is linked to the clamping action described above: when the adjusting ring 24 is rotated to clamp, the arc-shaped push plate 31 fixed inside it rotates accordingly. The inclined surface of the arc-shaped push plate 31 pushes the slide rod 32, thereby driving the positioning block 2 35 to move outward and compress the spring 1 33. When the adjusting ring 24 rotates to the predetermined position, the positioning block 2 35 is quickly ejected under the restoring force of the spring 1 33 and inserted into the preset limiting hole 21 on the L-shaped limiting plate 20, thereby locking the pressed-down L-shaped limiting plate 20 and firmly fixing it to the top of the pneumatic grinder 11, forming a stable three-point clamping structure.

[0025] For example, 1- Figure 18 As shown, the present invention also provides a method for using auxiliary equipment for the maintenance of diesel and heavy oil engine frames, the method comprising the following steps: S1. Fit the lower positioning plate 1 to the lower sealing surface of the engine frame 19 through the O-ring 18 and fix it with screw 17; install the positioning mandrel 2 on the lower positioning plate 1; put the upper positioning plate 3 on the positioning mandrel 2 and contact the upper sealing surface of the engine frame 19 through the positioning support block 4, and fix it with connecting screw 5. S2. Install the leveling support block 13 and the plane adjustment plate 15 on the upper positioning plate 3; finely adjust the flatness of the plane adjustment plate 15 by rotating at least three circumferentially distributed plane adjustment screws 14. S3. Install the precision rotating device 6 on the flatness adjustment plate 15 after adjusting the flatness; install the grinding wheel support block 7, the feed adjustment plate 10 and the pneumatic grinding wheel 11 on the precision rotating device 6 in sequence. S4. By rotating the feed adjustment screw 9 on the feed adjustment plate 10, the feed amount of the pneumatic grinding machine 11 is controlled, the pneumatic grinding machine 11 is started and rotated using the precision rotating device 6, and the sealing surface of the engine frame 19 is repaired.

[0026] Specifically, at the start of maintenance, the operator first cleans the upper and lower sealing surfaces of the cylinder liner of the engine frame 19. Then, the machined surface at the bottom of the lower positioning plate 1 is brought into close contact with the lower sealing surface of the frame through the sealing and compensating action of the O-ring 18. Here, the O-ring 18 not only seals to prevent air leakage, but more importantly, its elastic deformation compensates for microscopic unevenness, ensuring a good fit. Next, screws 17 are passed through the smooth or threaded holes on the lower positioning plate 1 to initially fix it to the frame, thus establishing a preliminary and reliable lateral positioning reference.

[0027] The threaded end of the positioning mandrel 2 is screwed into the threaded hole at the center of the lower positioning plate 1. This connection ensures that the axis of the positioning mandrel 2 is perpendicular to the reference plane established by the lower positioning plate 1, and accurately transmits the positioning center of the lower part upwards. The optical axis section of the positioning mandrel 2 serves as a precision guide for the installation of subsequent components.

[0028] The through hole in the center of the upper positioning plate 3 passes through the optical axis section of the positioning mandrel 2. Multiple positioning support blocks 4 are arranged in a circular array on the upper positioning plate 3. Their arc-shaped surfaces that contact the frame ensure good contact with the upper sealing surface of the cylinder liner, while avoiding stress concentration that could damage the sealing surface. By tightening the connecting screws 5, the upper positioning plate 3 is pressed and fixed, and the rigid platform on the frame is thus completed.

[0029] On the already aligned upper positioning plate 3, a leveling support block 13 is installed using screws 16, providing a stable base for the leveling mechanism. Then, a plane adjustment plate 15 is placed on it and supported and adjusted using at least three circumferentially distributed plane adjustment screws 14. By alternately fine-tuning the screw depth of each plane adjustment screw 14, the tilt angle of the plane adjustment plate 15 can be precisely changed, thereby adjusting its upper surface to an absolute level.

[0030] The precision rotating device 6 is mounted on the leveled plane adjusting plate 15. This device has a high-precision bearing structure, ensuring that its components can rotate smoothly and with low resistance around the central axis established by the positioning mandrel 2. Next, the grinding wheel support block 7 is fixed to the rotating component of the precision rotating device 6 using screw 8. The feed adjustment plate 10 is then vertically fixed to the side of the grinding wheel support block 7 using screw 12.

[0031] The body of the pneumatic grinder 11 is placed into the annular positioning ring 22 at the end of the grinder support block 7. Rotating the adjusting ring 24 causes the drive ring 25 inside it to rotate as well. The arc-shaped groove 26 on the drive ring 25 rotates accordingly, driving the embedded sliding shaft 28 to move along the groove, generating a centripetal radial displacement. The sliding shaft 28 pushes the limiting block 27 towards the center, and its anti-slip fixing surface is finally firmly pressed against the housing of the pneumatic grinder 11, completing the radial clamping. Simultaneously, when the adjusting ring 24 rotates to the predetermined clamping position, the positioning block 30 pops out under the thrust of the spring 36, locking into the groove of the adjacent adjusting plate 23, forming a self-locking mechanism to prevent the adjusting ring 24 from loosening due to vibration.

[0032] Simultaneously with the radial clamping action, the rotation of the adjusting ring 24 also causes the arc-shaped push plate 31 fixed inside it to rotate. The inclined surface of the arc-shaped push plate 31 acts on the groove at the end of the slide rod 32, pushing the slide rod 32 and the positioning block 35 fixed thereto to move outward and compress the spring 33. At this time, the operator presses down on the two L-shaped limiting plates 20, so that their top bends press tightly against the top of the pneumatic grinding wheel 11. When the adjusting ring 24 reaches the clamping position, the positioning block 35, under the strong restoring force of the spring 33, quickly pops out inward and accurately inserts into the preset limiting hole 21 on the L-shaped limiting plate 20, thereby locking the L-shaped limiting plate 20 in the pressed state.

[0033] After all installation and locking are completed, start the pneumatic grinding machine 11. The operator manually or via an auxiliary drive device rotates the entire precision rotating device 6 and above, including the grinding machine support block 7, the feed adjustment plate 10, and the pneumatic grinding machine 11, around the central axis at a uniform speed. By slowly rotating the feed adjustment screw 9 threaded onto the feed adjustment plate 10, its end presses against the housing of the pneumatic grinding machine 11, and the grinding wheel produces a smooth, new sealing surface perpendicular to the original cylinder liner centerline on the machine frame sealing surface, thus completing the repair work.

[0034] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A maintenance auxiliary device for a diesel engine frame, comprising a lower positioning plate (1), a positioning mandrel (2), and an upper positioning plate (3), characterized in that, The lower positioning plate (1) contacts the lower sealing surface of the engine frame (19) through an O-ring (18) and is fixed to the engine frame (19) by screws (17); the upper positioning plate (3) contacts the upper sealing surface of the engine frame (19) through a positioning support block (4) and is fixed to the engine frame (19) by connecting screws (5); the positioning spindle (2) connects the lower positioning plate (1) and the upper positioning plate (3). The upper positioning plate (3) is equipped with a leveling support block (13) and a plane adjustment plate (15). The leveling support block (13) is fixed to the upper positioning plate (3) by screws (16). The plane adjustment plate (15) is installed on the upper positioning plate (3) by plane adjustment screws (14). The plane adjustment plate (15) is equipped with a precision rotating device (6). The precision rotating device (6) is connected to a grinding wheel support block (7), which is fixed to the precision rotating device (6) by screw one (8). The grinding wheel support block (7) is connected to a feed adjustment plate (10), which is fixed to the grinding wheel support block (7) by screw two (12).

2. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 1, characterized in that, The feed adjustment plate (10) is threaded with a feed adjustment screw (9), and the end of the grinding machine support block (7) is connected to the installation mechanism via an annular positioning ring (22) to install a pneumatic grinding machine (11).

3. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 1, characterized in that, The lower positioning plate (1) is provided with a sealing groove for accommodating the O-ring (18) and a threaded hole or a smooth hole for passing through and connecting the screw four (17).

4. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 1, characterized in that, The planar adjustment plate (15) is connected to the upper positioning plate (3) by at least three planar adjustment screws (14) distributed in a circumferential direction, so as to realize the planarity fine adjustment of the planar adjustment plate (15). There are multiple positioning support blocks (4) arranged in a ring array on the upper positioning plate (3). The contact surface between the positioning support block (4) and the engine frame (19) is an arc surface.

5. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 2, characterized in that, The installation mechanism includes a limiting block (27) that applies pressure to fix the pneumatic grinder (11) and an adjusting ring (24) that drives the limiting block (27) to move. A driving ring (25) is installed on the inner wall of the adjusting ring (24) and rotates together with the annular positioning ring (22). An arc-shaped groove (26) is opened inside the driving ring (25) for the limiting block (27) at one end of the sliding shaft (28) to slide. The arc-shaped groove (26) cooperates with the sliding shaft (28) to drive the limiting block (27) to move. The contact surface between the sliding shaft (28) and the pneumatic grinder (11) is provided with an anti-slip fixing surface.

6. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 5, characterized in that, The installation mechanism also includes a positioning block (30) for limiting the adjustment ring (24). The outer wall of the positioning block (30) slides inside the adjustment ring (24) and the adjustment plate (23), and the other side of the outer wall is fitted with a spring (36). One end of the spring (36) is fixed inside the adjustment ring (24), and the other end is fixed to the outer wall of the limiting ring (29) in the middle of the positioning block (30).

7. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 5, characterized in that, The grinding wheel support block (7) has two L-shaped limiting plates (20) that slide inside, and the top turning point of the L-shaped limiting plate (20) is in contact with the top of the pneumatic grinding wheel (11). The adjusting ring (24) is provided with a limiting mechanism inside, which is used to fix the L-shaped limiting plate (20).

8. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 7, characterized in that, The limiting mechanism includes a positioning block two (35) for fixing the L-shaped limiting plate (20) and an arc-shaped push plate (31) for driving the positioning block two (35) to move. The arc-shaped push plate (31) is fixed inside the adjusting ring (24). The outer wall of the positioning block two (35) slides inside the limiting hole (21) and the annular positioning ring (22) inside the L-shaped limiting plate (20). A slide rod (32) is fixed on the other side of the outer wall, and a groove for the arc-shaped push plate (31) to slide is opened inside the slide rod (32).

9. The auxiliary equipment for maintenance of a diesel and heavy oil engine frame according to claim 8, characterized in that, The limiting mechanism also includes a spring (33) that drives the slide bar (32) and the positioning block (35) to reset. One end of the spring (33) is fixed inside the annular positioning ring (22), and the other end is fixed to the outer wall of the limiting ring (34) at one end of the positioning block (35).

10. A method of using a diesel-powered heavy-duty oil engine frame maintenance auxiliary device, applied to the diesel-powered heavy-duty oil engine frame maintenance auxiliary device as described in any one of claims 1-9, characterized in that, The method includes the following steps: S1. Place the lower positioning plate (1) against the lower sealing surface of the engine frame (19) through the O-ring (18) and fix it with screw four (17); install the positioning mandrel (2) on the lower positioning plate (1); put the upper positioning plate (3) on the positioning mandrel (2) and contact the upper sealing surface of the engine frame (19) through the positioning support block (4), and fix it with connecting screw (5); S2. Install the leveling support block (13) and the plane adjustment plate (15) on the upper positioning plate (3); finely adjust the flatness of the plane adjustment plate (15) by rotating at least three circumferentially distributed plane adjustment screws (14); S3. Install a precision rotating device (6) on the flatness adjustment plate (15) after adjusting the flatness; install a grinding wheel support block (7), a feed adjustment plate (10) and a pneumatic grinding wheel (11) on the precision rotating device (6) in sequence. S4. By rotating the feed adjustment screw (9) on the feed adjustment plate (10), control the feed amount of the pneumatic grinding machine (11), start the pneumatic grinding machine (11) and use the precision rotating device (6) to rotate it, and grind the sealing surface of the engine frame (19).

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