Diesel engine body opening device

Abstract

The invention discloses a diesel engine body opening device, which belongs to the technical field of engines and comprises a hydraulic oil pump assembly with a telescopic hydraulic arm. The tail end of the hydraulic oil pump assembly is hinged to the large support, and the tail end of a hydraulic arm at the other end is hinged to the small support. Each of the small support and the large support is an arc with one upper end and one lower end, the upper end is a connecting end, and the lower end is a working end; the two connecting ends are hinged; the hydraulic oil pump assembly is located between the connecting end and the working end. The two working ends are fixedly connected with supporting legs respectively; the two supporting legs are in bilateral symmetry, and each supporting leg comprises an L-shaped plate. The device is high in dismounting and mounting efficiency, safe, reliable, simple to operate, convenient to carry and wide in applicability, has an upper arch shape, can be used for opening a machine body to dismount and mount the main bearing cover in production, and can also be used for dismounting and mounting the main bearing cover in the maintenance process of a diesel engine.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically a diesel engine block expansion device. Background Technology

[0002] Currently, the main bearing cap of a diesel engine is fitted with an interference fit to ensure the engine's machinability, operational stability, and reliability. Installing the interference fit main bearing cap requires tools to pry open the engine block.

[0003] In the existing technology, the technical solution for opening the diesel engine block is shown in the patent "Method for Opening Diesel Engine Block" with announcement number CN107160135A. Its drawbacks are as follows: First, it uses two mechanisms: a vertical / horizontal jack and a double-ended screw mechanism. The alternating disassembly and assembly of these two mechanisms is cumbersome. Since a main bearing cap needs to be installed for each opening, repeated disassembly and assembly is labor-intensive, inefficient, and poses a high safety risk when there are many openings. Second, before the crankshaft is installed, the internal space of the engine block is relatively large, making traditional opening tools suitable. However, after the crankshaft and counterweight are installed, the internal space is compressed, leaving very little operating space. The vertical / horizontal jack becomes difficult to operate, especially when the connecting rod neck of some openings is higher than the engine block end face, interfering with the double-ended screw mechanism and preventing its installation. Therefore, this solution is not convenient for use when repairing or replacing the main bearing cap. Third, the double-ended screw mechanism (referred to as the opening and support device in the aforementioned patent, including push rod I10, connecting body 11, and push rod II12) has a small cross-sectional shape, limited load-bearing capacity, and is subject to the reaction force of the screw bearing the machine body, posing a risk of stripping and breakage. It has low safety and unreliable support, especially when the same double-ended screw is used repeatedly, as thread damage and internal screw damage are difficult to detect, increasing the risk of safety accidents. Furthermore, the small contact area between its two ends and the machine body leads to stress concentration, easily causing damage to the machine body. Therefore, the existing technology lacks a safe, reliable, and convenient diesel engine body opening device. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a diesel engine block opening device, which aims to open the engine block from above by bypassing the crankshaft portion that is higher than the end face of the engine block, and avoid using threads as the main load-bearing method, thereby improving safety and reliability, facilitating operation and use, and improving efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine block opening device, comprising a hydraulic pump assembly with a retractable hydraulic arm; the tail end of the hydraulic pump assembly is hinged to a large support, and the end of the hydraulic arm at its other end is hinged to a small support; both the small support and the large support are arc-shaped with one end on top and one end on the bottom, the upper end being a connecting end and the lower end being a working end; the two connecting ends are hinged to form an arch shape with the connecting end on top and the working end on the bottom; the hydraulic pump assembly is located between the connecting end and the working end, and is used to drive a pair of working ends to open or close by extending and retracting the hydraulic arm; each of the two working ends is fixedly connected to a support leg; the two support legs are symmetrical left and right, and each support leg includes an L-shaped plate, so that when the two working ends are open, the support leg can simultaneously support the upper end face and the inner side face of the engine block opening.

[0006] As a further optimization, the large support includes a pair of large arc-shaped plates arranged in parallel and spaced apart; the upper end face of the support leg is fixedly connected to the lower end of the pair of large arc-shaped plates to form the working end; the other end of the large arc-shaped plate is provided with a first pin hole; a first through hole is provided in the middle of each of the large arc-shaped plates; a small pin shaft is inserted into a pair of first through holes, and the middle of the small pin shaft is hinged to the tail end of the hydraulic pump assembly; the small support includes a pair of small arc-shaped plates arranged at intervals; the upper end face of the support leg is fixedly connected to the lower end of the pair of small arc-shaped plates to form the working end; the other end of the small arc-shaped plate is provided with a first shaft hole; a first large pin shaft is inserted into a pair of first pin holes and a pair of first shaft holes, hinged to the pair of large arc-shaped plates and the pair of small arc-shaped plates to form the connecting end; a second through hole is provided in the middle of the small arc-shaped plate, a second large pin shaft is inserted into a pair of second through holes, and the middle of the second large pin shaft is hinged to the end of the hydraulic arm.

[0007] As a further optimization, the hydraulic pump assembly has a first insertion hole at its tail end, and the small pin is inserted into the first insertion hole for hinged connection between the middle part of the small pin and the tail end of the hydraulic pump assembly; the hydraulic arm has a second insertion hole at its end, and the second large pin is inserted into the second insertion hole for hinged connection between the middle part of the second large pin and the end of the hydraulic arm.

[0008] As a further optimization, cotter pins are inserted at both ends of the first large pin, the second large pin, and the small pin.

[0009] As a further optimization, the upper end of the large support is connected to a lifting eye screw.

[0010] As a further optimization, the hydraulic pump assembly is a manual hydraulic pump assembly with a hand crank; the hand crank is located between a pair of large arc-shaped plates.

[0011] As a further optimization, the hydraulic pump assembly is equipped with a pressure relief valve.

[0012] As a further optimization, the support leg is fixedly connected to the contact surface of the body with a buffer pad.

[0013] The advantages of this invention are that the hydraulic force application ensures a stable and reliable opening process for the machine body, allowing for the opening of two adjacent sections at once, thus improving work efficiency. Compared to screw mechanisms, the contact area between the support legs and the machine body is larger, avoiding stress concentration, reducing damage to the machine body, and preventing thread stress, making it safer and more reliable. Operationally, only one device needs to be installed and removed from the machine body, avoiding the cumbersome operation of frequently disassembling and reassembling multiple mechanisms, making operation convenient and efficient.

[0014] In summary, this device is highly efficient in disassembly and assembly, safe and reliable, easy to operate, portable, and widely applicable. With its arched shape, it can be used to open up the machine body during production to disassemble and assemble the main bearing cover, and it can also be used for disassembling and assembling the main bearing cover during diesel engine maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention when it is working on a diesel engine block according to an embodiment of the invention;

[0017] Figure 3 This is a schematic diagram of the structure of the large support in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the small support structure according to an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the hydraulic oil pump assembly according to an embodiment of the present invention.

[0020] The correspondence between the technical features in the figure and the reference numerals is as follows: large support 1; large arc plate 11; first pin hole 112; first through hole 111; screw hole 113; support leg 12; small support 2; small arc plate 21; second through hole 211; first shaft hole 212; hydraulic oil pump assembly 3; hydraulic arm 31; hand crank 32; first insertion hole 33; second insertion hole 34; pressure relief valve 35; small pin 4; first large pin 5; second large pin 51; cotter pin 6; eye bolt 7; crankshaft 8; diesel engine block 81; crankshaft balance block 82. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of the present invention, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] Example; please refer to Figure 1-5 .

[0023] This embodiment provides a diesel engine block opening device, applied when the crankshaft 8 is already installed inside the diesel engine block 81 and the crankshaft balance block 82 protrudes from the upper surface of the diesel engine block 81; it includes a hydraulic pump assembly 3 with a retractable hydraulic arm 31; the tail end of the hydraulic pump assembly 3 is hinged to a large support 1, and the other end of the hydraulic arm 31 is hinged to a small support 2; both the small support 2 and the large support 1 are arc-shaped with one end on top and one end on the bottom, the upper end being the connecting end and the lower end being the working end. The two connecting ends are hinged to form an arch with the connecting end on top and the working end on the bottom. The hydraulic oil pump assembly 3 is located between the connecting end and the working end and is used to drive the pair of working ends to open or close by extending and retracting the hydraulic arm 31. The two working ends are respectively fixedly connected to support legs 12. The two support legs 12 are symmetrical from left to right. The support legs 12 include an L-shaped plate, so that when the two working ends are open, the support legs 12 can simultaneously support the upper end face and the inner side face of the machine body opening.

[0024] The hydraulic pump assembly 3 can be directly connected to a hydraulic hose, driving the hydraulic arm 31 via an external power source. This embodiment employs a more convenient implementation method: the hydraulic pump assembly 3 is a manual hydraulic pump assembly with a hand crank 32; the hydraulic pump assembly 3 is equipped with a pressure relief valve 35. Manually driving the hydraulic arm 31 to extend and retract eliminates the need for an external power source, resulting in a compact structure with minimal hose interference, making operation faster and more convenient. The pressure relief valve 35 allows for quick release of the spreading force, facilitating efficient removal of the device from the machine body.

[0025] In use, the support leg 12 of the machine body opening device is placed at the opening between the two gears of the machine body. The arched structure avoids the crankshaft 8's crank, allowing the interference fit main bearing cap to be installed without rotating the crankshaft 8 after it has fallen into the machine body, facilitating the removal and installation of the main bearing cap during diesel engine maintenance. By manually pressing, the hand crank 32 can be extended by connecting an extension rod during the pressing process. Hydraulic power is transmitted to the working end at the bottom of the arched structure, and the support leg 12, pressing against the machine body, opens the opening between the two gears of the machine body. The hydraulic force application is stable and reliable, opening two adjacent gears at a time, improving work efficiency. Compared to screw mechanisms, the support leg 12 in this embodiment has a larger contact area with the machine body, avoiding stress concentration, reducing damage to the machine body, and avoiding thread stress, making it safer and more reliable. Operationally, only one device needs to be installed and removed from the machine body, avoiding the cumbersome operation of frequently disassembling and reassembling multiple mechanisms, making operation convenient and efficient.

[0026] The structures of the large support 1 and the small support 2 can vary. For example, both the large support 1 and the small support 2 could be solid, resulting in a more robust and stronger structure, but also a heavier one. Therefore, this embodiment adopts a lighter structure. The large support 1 includes a pair of large arc-shaped plates 11, arranged in parallel and spaced apart. The upper end face of the support leg 12 is fixedly connected to the lower end of the pair of large arc-shaped plates 11, forming the working end. The other end of the large arc-shaped plate 11 is provided with a first pin hole 112. A first through hole 111 is provided in the middle of each of the large arc-shaped plates 11. The small pin 4 is inserted into the pair of first through holes 111, and the middle of the small pin 4 is connected to the hydraulic oil pump assembly. The tail end of component 3 is hinged; the small support 2 includes a pair of small arc-shaped plates 21, which are spaced apart; the upper end face of the support leg 12 is fixedly connected to the lower end of the pair of small arc-shaped plates 21 to form the working end; the other end of the small arc-shaped plate 21 is provided with a first shaft hole 212; the first large pin 5 is inserted into a pair of first pin holes 112 and a pair of first shaft holes 212, hinged to the pair of large arc-shaped plates 11 and the pair of small arc-shaped plates 21 to form the connecting end; the middle part of the small arc-shaped plate 21 is provided with a second through hole 211, and the second large pin 51 is inserted into a pair of second through holes 211, and the middle part of the second large pin 51 is hinged to the end of the hydraulic arm 31. The hand crank 32 is located between the pair of large arc-shaped plates 11.

[0027] To hinge the hydraulic pump assembly 3 between the large support 1 and the small support 2, an exemplary installation method is as follows: the hydraulic pump assembly 3 has a first insertion hole 33 at its tail end, and the small pin 4 is inserted into the first insertion hole 33 for hinged connection between the middle part of the small pin 4 and the tail end of the hydraulic pump assembly 3; the hydraulic arm 31 has a second insertion hole 34 at its end, and the second large pin 51 is inserted into the second insertion hole 34 for hinged connection between the middle part of the second large pin 51 and the end of the hydraulic arm 31.

[0028] Preferably, cotter pins 6 are inserted at both ends of the first large pin 5, the second large pin 51, and the small pin 4. This can prevent the first large pin 5, the second large pin 51, and the small pin 4 from accidentally coming off.

[0029] More preferably, the upper end of the large support 1 is connected to a lifting eye screw 7, which facilitates the transfer of the device by lifting equipment such as overhead cranes, reducing manual handling, saving time and effort, and reducing labor intensity. The lifting eye screw 7 is screwed into a pre-set screw hole 113 on the top of the large arched plate.

[0030] Furthermore, a buffer pad is fixedly connected to the contact surface between the support leg 12 and the body. This not only further reduces impact damage to the support leg 12, but also increases the friction between the support leg 12 and the body, preventing the support leg 12 from slipping off.

[0031] More specifically, the body opening device includes: a large support 1, a small support 2, a manual hydraulic oil pump, a small pin 4, a first large pin 5, a cotter pin 6, and a lifting eye screw 7. The large support 1 includes a large arched plate and a support leg 12. The large arched plate is fixedly connected to the support leg 12 at intervals. The large arched plate has a first through hole 111, a first pin hole 112, and a screw hole 113. The support leg 12 is an L-shaped plate. The curvature and height of the large arched plate can avoid the height of the crank. The first through hole 111 is used to fix the manual hydraulic oil pump, and the first pin hole 112 is used to connect the small support 2. The top screw hole 113 is used to install the lifting eye screw 7. The small arched plate has a curvature and height that can avoid the height of the crank and is consistent with the large arched plate. It has holes, namely a second through hole 211 and a first shaft hole 212. The first shaft hole 212 is paired with the first pin hole 112. The first large pin 5 passes through the two holes to form a hinge.

[0032] The advantages of this embodiment are that it uses hydraulic force, resulting in a stable and reliable process, and can open two adjacent gears at once, improving work efficiency. Compared to screw mechanisms, the support leg 12 in this embodiment has a larger contact area with the machine body, avoiding stress concentration, reducing damage to the machine body, and avoiding thread stress, making it safer and more reliable. In terms of operation, only one device needs to be installed and removed from the machine body, avoiding the cumbersome operation of frequently disassembling and reassembling multiple mechanisms, making operation convenient and efficient.

Claims

1. A diesel engine block expansion device, comprising a hydraulic pump assembly (3) having a retractable hydraulic arm (31); characterized in that: The tail end of the hydraulic pump assembly (3) is hinged to the large support (1), and the end of the hydraulic arm (31) at the other end is hinged to the small support (2). Both the small support (2) and the large support (1) are arc-shaped with one end on top and the other end on the bottom, with the upper end being the connecting end and the lower end being the working end; the two connecting ends are hinged to form an arch with the connecting end on top and the working end on the bottom; the hydraulic oil pump assembly (3) is located between the connecting end and the working end; Each of the two working ends is fixedly connected to a support leg (12); the two support legs (12) are symmetrical from left to right, and each support leg (12) includes an L-shaped plate, which is used to support the upper end face and inner side face of the machine body opening when the two working ends are opened.

2. The diesel engine block spreading device according to claim 1, characterized in that: The large support (1) includes a pair of large arc-shaped plates (11) arranged in parallel and spaced apart; the upper end face of the support leg (12) is fixedly connected to the lower end of the pair of large arc-shaped plates (11) to form the working end; the other end of the large arc-shaped plate (11) is provided with a first pin hole (112); a first through hole (111) is provided in the middle of the large arc-shaped plate (11); a small pin shaft (4) is inserted into the pair of first through holes (111), and the middle part of the small pin shaft (4) is hinged to the tail end of the hydraulic oil pump assembly (3); The small support (2) includes a pair of small arc-shaped plates (21) arranged at intervals; the upper end face of the support leg (12) is fixedly connected to the lower end of the pair of small arc-shaped plates (21) to form the working end; the other end of the small arc-shaped plate (21) is provided with a first shaft hole (212); The first large pin (5) is inserted into a pair of first pin holes (112) and a pair of first shaft holes (212), which hinge a pair of large arc plates (11) and a pair of small arc plates (21) to form the connecting end; The small arc plate (21) has a second through hole (211) in the middle, and the second large pin (51) is inserted into a pair of second through holes (211). The middle part of the second large pin (51) is hinged to the end of the hydraulic arm (31).

3. The diesel engine block spreading device according to claim 2, characterized in that: The hydraulic pump assembly (3) has a first insertion hole (33) at its tail end, and the small pin (4) is inserted into the first insertion hole (33) for hinged connection between the middle part of the small pin (4) and the tail end of the hydraulic pump assembly (3); the hydraulic arm (31) has a second insertion hole (34) at its end, and the second large pin (51) is inserted into the second insertion hole (34) for hinged connection between the middle part of the second large pin (51) and the end of the hydraulic arm (31).

4. The diesel engine block spreading device according to claim 2, characterized in that: Both ends of the first large pin (5), the second large pin (51) and the small pin (4) are fitted with cotter pins (6).

5. A diesel engine block spreading device according to claim 1, characterized in that: The upper end of the large support (1) is connected to a lifting eye screw (7).

6. A diesel engine block spreading device according to claim 2, characterized in that: The hydraulic pump assembly (3) is a manual hydraulic pump assembly with a hand crank (32); the hand crank (32) is located between a pair of large arc plates (11).

7. A diesel engine block spreading device according to claim 1, characterized in that: The hydraulic pump assembly (3) is equipped with a pressure relief valve (35).

8. A diesel engine block spreading device according to claim 1, characterized in that: The support leg (12) is fixedly connected to the contact surface of the body with a buffer pad.

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