Maintenance device and maintenance method for fuel injection pump

Abstract

The fuel injection pump overhauling device comprises a first positioning frame and a second positioning frame, the first positioning frame is detachably arranged on a positioning platform, the second positioning frame is movably arranged on the first positioning frame, and the second positioning frame can stretch out and draw back in the vertical direction of the first positioning frame; an overhauling tool is further arranged on the second positioning frame, the working position of the overhauling tool is arranged opposite to a bearing plate detachably connected to the first positioning frame, and the overhauling tool can extract a plunger guide cylinder in the vertical direction of the fuel injection pump. The first positioning frame is detachably connected with the positioning platform through bolts, countersunk bolt holes are formed in the four corners of the first positioning frame, the first positioning frame is detachably connected with the bearing plate through bolts, and the first positioning frame comprises a positioning flat plate. The positioning flat plate is provided with fuel injection pump positioning ends which are symmetrically arranged.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engine maintenance, and in particular relates to a fuel injection pump maintenance device and a maintenance method. Background Art

[0002] With the continuous development of industry and transportation, internal combustion engines are widely used as power sources in many fields such as automobiles, ships, and engineering machinery. As a key component of the internal combustion engine fuel supply system, the performance of the fuel injection pump directly affects the power, economy, and emission performance of the internal combustion engine.

[0003] Modern internal combustion engines require fuel injection pumps to achieve precise fuel injection quantity control, flexible injection timing adjustment, and fuel supply strategies that adapt to different working conditions. This places higher demands on the manufacturing process and maintenance technology of fuel injection pumps.

[0004] In order to meet increasingly stringent environmental regulations and energy efficiency standards, the design and manufacturing of fuel injection pumps are constantly innovating, using advanced technologies such as common rail fuel injection technology and electronically controlled unit pump technology. The application of these new technologies makes the maintenance of fuel injection pumps more complicated, requiring maintenance personnel to have more in-depth professional knowledge and advanced testing equipment.

[0005] The prior art discloses a diesel engine fuel injection pump maintenance device (CN 205852712 U). The maintenance device eliminates the need for repeated tightening and loosening of a vise and moving of the fuel injection pump, thereby improving maintenance efficiency while ensuring maintenance safety.

[0006] When the above-mentioned prior art maintenance device is used to disassemble the fuel injection pump, it is time-consuming and laborious to extract the plunger guide cylinder, and an additional auxiliary operation through a jacking tool is required. In addition, when the fuel injection pump is disassembled and repaired, the fuel injection pump is not firmly positioned by its own weight.

[0007] In view of the above factors, a fuel injection pump maintenance device and maintenance method are provided. Through the maintenance device and method, regular maintenance and timely maintenance can be performed to avoid small problems from developing into major failures, and the high cost of replacing the entire fuel injection pump or performing large-scale engine maintenance due to serious damage to the fuel injection pump can be reduced. Summary of the invention

[0008] The object of the present invention is to provide a fuel injection pump maintenance device and maintenance method to solve the problems raised in the above background technology.

[0009] The objective of the present invention is achieved through the following technical solution: a fuel injection pump maintenance device, comprising a first positioning frame and a second positioning frame, wherein the first positioning frame is detachably arranged on a positioning platform, the second positioning frame is movably arranged on the first positioning frame, and the second positioning frame can be extended and retracted in a vertical direction along the first positioning frame;

[0010] The second positioning frame is also provided with a maintenance tool, the working position of which is arranged opposite to a supporting plate detachably connected to the first positioning frame, and the maintenance tool can extract the plunger guide cylinder along the vertical direction of the fuel injection pump.

[0011] Furthermore, the first positioning frame and the positioning platform are detachably connected by bolts, and countersunk bolt holes are provided at the four corners of the first positioning frame;

[0012] The detachable connection between the first positioning frame and the supporting plate is a bolt connection.

[0013] Furthermore, the first positioning frame includes a positioning plate, and the positioning plate is provided with a fuel injection pump positioning end, and the fuel injection pump positioning end is symmetrically arranged;

[0014] A supporting plate is arranged between the positioning ends of the fuel injection pumps which are arranged opposite to each other on the positioning plate.

[0015] Furthermore, the fuel injection pump positioning end includes a positioning seat and a positioning rod movably connected to the positioning seat, and the front end of the positioning rod is detachably connected to a concave-shaped positioning groove, and the positioning groove is open.

[0016] Furthermore, the detachable connection between the positioning rod and the concave-shaped positioning groove is a bolt connection, and the bottom of the positioning groove is arranged in the track groove on the positioning plate;

[0017] The positioning grooves are symmetrically arranged, and the positioning grooves can move toward each other through the stretching of the positioning rod.

[0018] Furthermore, a positioning hole is provided on the positioning seat, the positioning hole and the channel for accommodating the positioning rod are arranged to penetrate each other, and a pin hole channel is provided on the positioning rod, and the positioning hole of the pin hole channel cooperates to fix the positioning groove.

[0019] Furthermore, the second positioning frame is a telescopic frame structure that is symmetrical to each other. The second positioning frame is located on both sides of the first positioning frame and can slide along the symmetrical tracks on the first positioning frame.

[0020] Furthermore, the maintenance tool is detachably connected to the second positioning frame, and the maintenance tool comprises a parallel plate, and two sides of the parallel plate are connected to the second positioning frame by bolts;

[0021] The parallel plate is provided with symmetrical fuel injection pump docking slots, which are coaxially arranged with the fuel injection pump mounting hole and fixed by bolts / bolts;

[0022] A jacking hole is fixedly arranged between the symmetrically connected slots of the fuel injection pump, a jacking bolt is arranged in the jacking hole, and the jacking bolt cooperates with a jacking channel at the bottom of the plunger guide tube of the fuel injection pump.

[0023] A maintenance method for a fuel injection pump maintenance device comprises the following steps;

[0024] Remove the peripheral pipes and components connected to the fuel injection pump on the internal combustion engine, loosen the connecting bolts of the oil outlet device on the upper part of the fuel injection pump, and use a socket wrench to loosen the nuts connecting the lower part of the fuel injection pump to the engine;

[0025] The disassembled fuel injection pump is placed on a supporting plate detachably connected to the first positioning frame, and the front end of the positioning rod is detachably connected to the symmetrical concave-shaped positioning grooves to clamp and fix the two sides of the fuel injection pump, and a positioning hole and a channel for accommodating the positioning rod are set on the positioning seat, and a pin hole channel is set on the positioning rod, and the positioning groove is fixed by the positioning hole of the pin hole channel.

[0026] Slide the second positioning frame along the symmetrical track on the first positioning frame to the middle position, so that the inspection tool is opposite to the fuel injection pump, and the symmetrical fuel injection pump docking slots on the parallel plate are coaxially arranged with the fuel injection pump mounting holes, and fixed by bolts / bolts;

[0027] A lifting hole is fixedly arranged between the butt-jointed slots of the fuel injection pump, and a lifting bolt is arranged in the lifting hole. The lifting bolt cooperates with the lifting channel at the bottom of the plunger guide tube of the fuel injection pump for extraction;

[0028] Tighten the jacking bolt to make the plunger guide cylinder move downward, and then remove the plunger guide cylinder retaining ring. After removing the retaining ring, rotate the jacking bolt counterclockwise, and the plunger spring in the injection pump will lift the plunger guide cylinder. When the plunger guide cylinder rises to the highest position, remove the maintenance tooling;

[0029] Remove the plunger from the fuel injection pump sleeve, disassemble the ring gear and rack, and remove the spring and spring seat;

[0030] Clean, remove carbon deposits and rust from each component, and inspect, polish and grind the disassembled components;

[0031] After the inspection and measurement are completed, reset and assemble according to the standards, put it on the test bench, run-in after installation, and adjust the oil supply.

[0032] The invention discloses an overhaul method of a fuel injection pump overhaul device, which is applied to the overhaul of a fuel injection pump on an internal combustion engine, so as to prolong the service life of the engine and reduce the maintenance cost.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The maintenance device of the present invention can facilitate the extraction of the plunger guide cylinder when disassembling the fuel injection pump, saving time and effort, and does not require additional auxiliary operations through a jacking tool. When the fuel injection pump is disassembled and repaired, the fuel injection pump can be kept stable in a disassembled state.

[0035] The present invention slides the second positioning frame along the symmetrical track on the first positioning frame to the middle position, so that the maintenance tool is opposite to the fuel injection pump, and the parallel plate is provided with symmetrical fuel injection pump docking slots and the fuel injection pump mounting holes are coaxially arranged and fixed by bolts / bolts, and symmetrically a jacking hole is fixedly arranged between the fuel injection pump docking slots, and a jacking bolt is arranged in the jacking hole. The jacking bolt cooperates with the jacking channel at the bottom of the plunger guide cylinder of the fuel injection pump for extraction, and the plunger guide cylinder moves downward by tightening the jacking bolt, and then the plunger guide cylinder retaining ring is removed, and after the retaining ring is removed, the jacking bolt is rotated counterclockwise, and the plunger spring in the fuel injection pump lifts the plunger guide cylinder, and when the plunger guide cylinder rises to the highest position, the maintenance tool is removed; the plunger is taken out from the fuel injection pump sleeve, the gear ring and the rack are disassembled, and the spring and the spring seat are taken out; each component is cleaned, carbon deposits are removed, and rust is removed, and each removed component is inspected, polished, and ground;

[0036] Through the above operation, the present invention maintains stable operation of the engine, prevents problems such as uneven fuel supply and pressure fluctuation caused by fuel injection pump failure, ensures smooth operation of the internal combustion engine, reduces jitter, noise and abnormal vibration; extends the service life of the engine: promptly repairs or replaces worn and damaged fuel injection pump parts to avoid further deterioration of the failure and damage to other engine parts, thereby extending the service life of the entire internal combustion engine.

[0037] The maintenance method of the present invention prevents small problems from developing into major failures through regular inspections and timely repairs, reduces the high cost of replacing the entire fuel injection pump or performing large-scale engine repairs due to severe damage to the fuel injection pump, ensures that the fuel injection pump can work normally under various operating conditions, reduces unexpected engine shutdowns or failures to start due to fuel supply problems, and improves the reliability of internal combustion engine operation.

[0038] The maintenance method of the present invention can reduce maintenance costs, improve the power performance and fuel economy of the internal combustion engine, reduce the content of harmful substances in tail gas emissions, and has strong popularization potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0040] Figure 2 The present invention Figure 1 Main view schematic diagram;

[0041] Figure 3 The present invention Figure 1 Schematic diagram from top view;

[0042] Figure 4 It is a partial enlarged schematic diagram of the positioning end of the fuel injection pump of the present invention;

[0043] Figure 5 The present invention Figure 3 Schematic diagram of the connections of various parts at the fuel injection pump positioning end;

[0044] Figure 6 It is an enlarged schematic diagram of the maintenance tooling of the present invention;

[0045] Figure 7 It is a plane schematic diagram of the parallel plate of the present invention. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] like Figure 1-7 As shown, a fuel injection pump maintenance device comprises a first positioning frame 1 and a second positioning frame 2, wherein the first positioning frame 1 is detachably arranged on a positioning platform, the second positioning frame 2 is movably arranged on the first positioning frame 1, and the second positioning frame 2 can be extended and retracted in a vertical direction along the first positioning frame 1;

[0050] The second positioning frame 2 is also provided with a maintenance tool 3, the working position of the maintenance tool 3 is arranged opposite to the supporting plate 4 detachably connected to the first positioning frame 1, and the maintenance tool 3 can extract the plunger guide cylinder along the vertical direction of the fuel injection pump.

[0051] In order to facilitate detachable replacement in use, the first positioning frame 1 and the positioning platform are detachably connected by bolts, and countersunk bolt holes are provided at the four corners of the first positioning frame 1;

[0052] The detachable connection between the first positioning frame 1 and the supporting plate 4 is a bolt connection.

[0053] In order to facilitate positioning of the fuel injection pump by the first positioning frame in the use state, the first positioning frame 1 includes a positioning plate 11, and the positioning plate 11 is provided with a fuel injection pump positioning end 12, and the fuel injection pump positioning end 12 is symmetrically arranged;

[0054] A supporting plate 4 is arranged between the fuel injection pump positioning ends 12 which are arranged opposite to each other on the positioning flat plate 11 .

[0055] In order to facilitate the fixing of the fuel pump through the fuel pump positioning end to maintain its positioning stability when in use, the fuel pump positioning end 12 includes a positioning seat 12a and a positioning rod 12b movably connected to the positioning seat 12a, and the front end of the positioning rod 12b is detachably connected to a concave-shaped positioning groove 12c, and the positioning groove 12c is open.

[0056] The detachable connection between the positioning rod 12b and the concave positioning groove 12c is a bolt connection, and the bottom of the positioning groove 12c is arranged in the track groove 13 on the positioning plate 11;

[0057] The positioning grooves 12c are symmetrically arranged, and the positioning grooves 12c can move toward each other through the stretching of the positioning rods 12b.

[0058] The positioning seat 12a is provided with a positioning hole, and the positioning hole and the channel for accommodating the positioning rod are arranged through, and the positioning rod 12b is provided with a pin hole channel, and the positioning hole of the pin hole channel cooperates to fix the positioning groove 12c.

[0059] The positioning rod can drive the positioning groove to move, thereby fixing the fuel injection pump.

[0060] The second positioning frame 2 is a symmetrical telescopic frame structure. The second positioning frame 2 is located on both sides of the first positioning frame 1 and can slide along the symmetrical tracks on the first positioning frame 1 .

[0061] The second positioning frame 2 is telescopically arranged, and the telescopic arrangement is in the form of a hydraulic cylinder controlling the telescopic movement.

[0062] In order to facilitate the disassembly of the fuel injection pump by the maintenance tool in the use state, the maintenance tool 3 is connected to the second positioning frame 2 in a detachable manner, and the maintenance tool 3 includes a parallel plate 31, and the two sides of the parallel plate 31 are connected to the second positioning frame 2 by bolts;

[0063] The parallel plate 31 is provided with symmetrical fuel injection pump docking slots 32 , which are coaxially arranged with the fuel injection pump mounting hole and fixed by bolts / bolts;

[0064] A lifting hole 33 is fixedly arranged between the symmetrically arranged fuel injection pump docking slots 32 , and a lifting bolt is arranged in the lifting hole 33 , and the lifting bolt cooperates with the lifting channel at the bottom of the plunger guide tube of the fuel injection pump.

[0065] A maintenance method for a fuel injection pump maintenance device comprises the following steps;

[0066] Remove the peripheral pipes and components connected to the fuel injection pump on the internal combustion engine, loosen the connecting bolts of the oil outlet device on the upper part of the fuel injection pump, and use a socket wrench to loosen the nuts connecting the lower part of the fuel injection pump to the engine;

[0067] The disassembled fuel injection pump is placed on a supporting plate detachably connected to the first positioning frame, and the front end of the positioning rod is detachably connected to the symmetrical concave-shaped positioning grooves to clamp and fix the two sides of the fuel injection pump, and a positioning hole and a channel for accommodating the positioning rod are set on the positioning seat, and a pin hole channel is set on the positioning rod, and the positioning groove is fixed by the positioning hole of the pin hole channel.

[0068] Slide the second positioning frame along the symmetrical track on the first positioning frame to the middle position, so that the inspection tool is opposite to the fuel injection pump, and the symmetrical fuel injection pump docking slots on the parallel plate are coaxially arranged with the fuel injection pump mounting holes, and fixed by bolts / bolts;

[0069] A lifting hole is fixedly arranged between the butt-jointed slots of the fuel injection pump, and a lifting bolt is arranged in the lifting hole. The lifting bolt cooperates with the lifting channel at the bottom of the plunger guide tube of the fuel injection pump for extraction;

[0070] Tighten the jacking bolt to make the plunger guide cylinder move downward, and then remove the plunger guide cylinder retaining ring. After removing the retaining ring, rotate the jacking bolt counterclockwise, and the plunger spring in the injection pump will lift the plunger guide cylinder. When the plunger guide cylinder rises to the highest position, remove the maintenance tooling;

[0071] Remove the plunger from the fuel injection pump sleeve, disassemble the ring gear and rack, and remove the spring and spring seat;

[0072] Clean, remove carbon deposits and rust from each component, and inspect, polish and grind the disassembled components;

[0073] After the inspection and measurement are completed, reset and assemble according to the standards, put it on the test bench, run-in after installation, and adjust the oil supply.

[0074] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0075] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fuel injection pump maintenance device, characterized in that: The invention comprises a first positioning frame (1) and a second positioning frame (2), wherein the first positioning frame (1) is detachably arranged on a positioning platform, the second positioning frame (2) is movably arranged on the first positioning frame (1), and the second positioning frame (2) can be extended and retracted in a vertical direction along the first positioning frame (1); The second positioning frame (2) is also provided with a maintenance tool (3), the working position of the maintenance tool (3) is arranged opposite to the supporting plate (4) connected to the first positioning frame (1) in a detachable manner, and the maintenance tool (3) can extract the plunger guide cylinder along the vertical direction of the fuel injection pump.

2. The fuel injection pump maintenance device according to claim 1, characterized in that: The first positioning frame (1) and the positioning platform are detachably connected by bolts, and countersunk bolt holes are provided at the four corners of the first positioning frame (1); The detachable connection between the first positioning frame (1) and the supporting plate (4) is a bolt connection.

3. The fuel injection pump maintenance device according to claim 2, characterized in that: The first positioning frame (1) comprises a positioning plate (11), on which a fuel injection pump positioning end (12) is arranged, and the fuel injection pump positioning end (12) is symmetrically arranged; A supporting plate (4) is arranged between the fuel injection pump positioning ends (12) arranged opposite to each other on the positioning plate (11).

4. The fuel injection pump maintenance device according to claim 3 is characterized in that: The fuel injection pump positioning end (12) comprises a positioning seat (12a) and a positioning rod (12b) movably connected to the positioning seat (12a); the front end of the positioning rod (12b) is detachably connected to a concave-shaped positioning groove (12c); and the positioning groove (12c) is open.

5. The fuel injection pump maintenance device according to claim 4 is characterized in that: The detachable connection between the positioning rod (12b) and the concave-shaped positioning groove (12c) is a bolt connection, and the bottom of the positioning groove (12c) is arranged in the track groove (13) on the positioning plate (11); The positioning grooves (12c) are symmetrically arranged, and the positioning grooves (12c) can move towards each other through the stretching of the positioning rod (12b).

6. The fuel injection pump maintenance device according to claim 5, characterized in that: The positioning seat (12a) is provided with a positioning hole, the positioning hole and a channel for accommodating a positioning rod are intersected, and the positioning rod (12b) is provided with a pin hole channel, the pin hole channel positioning hole cooperates with the positioning groove (12c) to fix it.

7. The fuel injection pump maintenance device according to claim 6, characterized in that: The second positioning frame (2) is a mutually symmetrical telescopic frame structure; the second positioning frame (2) is located on both sides of the first positioning frame (1) and is capable of sliding along a symmetrical track on the first positioning frame (1).

8. The fuel injection pump maintenance device according to claim 7, characterized in that: The maintenance tool (3) is detachably connected to the second positioning frame (2), and the maintenance tool (3) comprises a parallel plate (31), and two sides of the parallel plate (31) are connected to the second positioning frame (2) by bolts; The parallel plate (31) is provided with symmetrical fuel injection pump docking slots (32), the fuel injection pump docking slots (32) are coaxially arranged with the fuel injection pump mounting hole and are fixed by bolts / bolts; A lifting hole (33) is fixedly arranged between the symmetrically connected fuel injection pump docking slots (32), a lifting bolt is arranged in the lifting hole (33), and the lifting bolt cooperates with a lifting channel at the bottom of the plunger guide tube of the fuel injection pump.

9. A maintenance method for the fuel injection pump maintenance device according to claims 1-8, characterized in that: The steps include: Remove the peripheral pipes and components connected to the fuel injection pump on the internal combustion engine, loosen the connecting bolts of the oil outlet device on the upper part of the fuel injection pump, and use a socket wrench to loosen the nuts connecting the lower part of the fuel injection pump to the engine; The disassembled fuel injection pump is placed on a supporting plate detachably connected to the first positioning frame, and the front end of the positioning rod is detachably connected to the symmetrical concave-shaped positioning grooves to clamp and fix the two sides of the fuel injection pump, and a positioning hole and a channel for accommodating the positioning rod are set on the positioning seat, and a pin hole channel is set on the positioning rod, and the positioning groove is fixed by the positioning hole of the pin hole channel. Slide the second positioning frame along the symmetrical track on the first positioning frame to the middle position, so that the inspection tool is opposite to the fuel injection pump, and the symmetrical fuel injection pump docking slots on the parallel plate are coaxially arranged with the fuel injection pump mounting holes, and fixed by bolts / bolts; A jacking hole is fixedly arranged between the symmetrically arranged butt-jointed slots of the fuel injection pump, a jacking bolt is arranged in the jacking hole, and the jacking bolt cooperates with the jacking channel at the bottom of the plunger guide tube of the fuel injection pump for extraction; Tighten the jacking bolt to make the plunger guide cylinder move downward, and then remove the plunger guide cylinder retaining ring. After removing the retaining ring, rotate the jacking bolt counterclockwise, and the plunger spring in the injection pump will lift the plunger guide cylinder. When the plunger guide cylinder rises to the highest position, remove the maintenance tooling; Remove the plunger from the fuel injection pump sleeve, disassemble the ring gear and rack, and remove the spring and spring seat; Clean, remove carbon deposits and rust from each component, and inspect, polish and grind the disassembled components; After the inspection and measurement are completed, reset and assemble according to the standards, put it on the test bench, run-in after installation, and adjust the oil supply.

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