Integrated hydraulic stretcher for marine low-speed diesel engine

Abstract

The utility model discloses an integrated hydraulic stretcher for a marine low-speed diesel engine, which relates to the technical field of hydraulic stretchers, and comprises a hydraulic cylinder body, the hydraulic cylinder body is of a hollow cylindrical structure with one closed end, and the side wall of the hydraulic cylinder body is provided with a high-pressure oil inlet; a piston assembly is arranged in the hydraulic cylinder body and comprises a piston body capable of moving in the cylinder body in a reciprocating mode, a piston rod is connected to the piston body, and the piston rod extends out of the hydraulic cylinder body from a center hole of the hydraulic cylinder body. A stretching sleeve is fixedly connected to the end, away from the piston body, of the piston rod and internally provided with internal threads. The periphery of the hydraulic cylinder body is in threaded connection with a reaction nut; the hydraulic cylinder body and the stretching sleeve are rigidly and integrally connected through the piston rod to form an integrally movable stretching mechanism; working efficiency, operation convenience, stability and adaptability are improved, and safety and stability of key bolt connection in the marine low-speed diesel engine are ensured.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic tensioner technology, and more specifically, to an integrated hydraulic tensioner for marine low-speed diesel engines. Background Technology

[0002] The operation of marine low-speed diesel engines requires high-strength bolt connections, especially during the assembly and maintenance of the cylinder head and other critical components, where bolt preload is crucial. Because marine low-speed diesel engines typically withstand high mechanical loads and vibrations, ensuring the strength and consistency of bolt connections is paramount. Insufficient bolt preload can lead to mechanical failures or loosening of components, affecting the engine's performance and safety.

[0003] Traditional bolt tensioning methods rely heavily on manual labor or hand tools, which often cannot guarantee the predetermined tension force and accuracy. The disadvantages of manual operation include uneven tension force, long operation time, and high labor intensity for personnel, which can easily lead to errors and thus affect the connection quality of the bolts.

[0004] To overcome these problems, hydraulic tensioners were developed. They can provide precise and uniform tension through a hydraulic system, thereby ensuring that the preload of the bolts reaches the set requirements and ensuring the stability and safety of the connection.

[0005] However, traditional hydraulic tensioners are often cumbersome to connect and inconvenient to operate. Therefore, developing a hydraulic tensioner with a simplified structure, easy operation, and strong adaptability is key to improving the maintenance efficiency and reliability of marine low-speed diesel engines. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide an integrated hydraulic tensioner for marine low-speed diesel engines, which can solve these problems.

[0007] To solve the above problems, the present invention adopts the following technical solution:

[0008] An integrated hydraulic tensioner for marine low-speed diesel engines, comprising:

[0009] The hydraulic cylinder body is a hollow cylindrical structure with one end closed, and the side wall of the hydraulic cylinder body is provided with a high-pressure oil inlet;

[0010] The hydraulic cylinder is provided with a piston assembly, which includes a piston body that can reciprocate within the cylinder. A piston rod is connected to the piston body and extends from the central hole of the hydraulic cylinder to the outside of the hydraulic cylinder.

[0011] A tension sleeve is fixedly connected to one end of the piston rod away from the piston body, and the tension sleeve has an internal thread.

[0012] The hydraulic cylinder body is threaded with a reaction nut on its outer circumference.

[0013] The hydraulic cylinder and the tension sleeve are rigidly integrated through the piston rod, forming an integrally movable tensioning mechanism.

[0014] As a preferred embodiment of this utility model, the high-pressure oil inlet is equipped with a quick-connect connector for easy connection to an external hydraulic pump.

[0015] As a preferred embodiment of this utility model, the tension sleeve is provided with an anti-rotation groove for installing an auxiliary wrench to prevent rotation.

[0016] As a preferred embodiment of this utility model, the reaction nut has a double-threaded structure, which can quickly adjust the height and adapt to different models of diesel engine cylinder blocks.

[0017] As a preferred embodiment of this utility model, the hydraulic cylinder body is provided with a carrying handle, and the carrying handle is covered with a rubber pad.

[0018] In a preferred embodiment of this utility model, the tension sleeve and the bolt to be tensioned are connected by a threaded connection.

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] 1. Improved precision and reliability: The tension sleeve achieves precise tensioning of the bolts through the hydraulic system, ensuring the reliability and consistency of the large bolt connections in marine low-speed diesel engines. By keeping the bolts in a tensioned state, the preload of the bolts can be effectively guaranteed, preventing bolt loosening and improving the long-term stability of the equipment.

[0021] 2. Enhanced operational stability and safety: The design of the reaction nut provides reverse support to the hydraulic cylinder, ensuring the stability of the hydraulic tensioner during the stretching process and preventing the hydraulic cylinder from moving as a whole. This ensures operational stability and safety, and avoids overstretching or equipment instability.

[0022] 3. Simplified hydraulic system connection: The quick-connect coupling design makes the connection process between the hydraulic oil inlet and the external hydraulic pump simpler and more efficient. Operators can quickly complete the connection or disconnection operation, saving time and improving work efficiency.

[0023] 4. Ensure the stability of the tension sleeve: The anti-rotation groove on the outside of the tension sleeve is fixed by an auxiliary wrench to prevent the tension sleeve from rotating during the stretching process, thus ensuring the stable application of the stretching force and preventing the stretching effect from being unstable or failing to reach the expected force value due to rotation.

[0024] 5. Adaptable to different diesel engine cylinder blocks: The reaction nut adopts a double-threaded structure, which can quickly adjust the height to meet the needs of different diesel engine cylinder blocks. Operators can make precise height adjustments by simply rotating the reaction nut, which improves the versatility and adaptability of the equipment.

[0025] 6. Easy to carry and operate: The hydraulic cylinder body is equipped with a carrying handle with rubber pads, which provides extra comfort and grip stability. Operators can easily carry the hydraulic tensioner, especially when it is not connected to external equipment, and it is convenient to adjust its position.

[0026] 7. Tight connection and load bearing: The tension sleeve and the bolt to be tensioned are connected by threads, ensuring a firm fit between the tension sleeve and the bolt, and the ability to withstand tensile loads. Through precise matching of internal and external threads, the force is effectively transmitted during the tensioning process, ensuring that the bolt tension is moderate, which is suitable for precision installation and maintenance tasks.

[0027] It improves the working efficiency, ease of operation, stability and adaptability of hydraulic tensioners, ensuring the safety and stability of key bolt connections in marine low-speed diesel engines. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a side view of the structure of this utility model;

[0030] Figure 3 This is a schematic diagram of the internal structure of the hydraulic cylinder body of this utility model;

[0031] Figure 4 This utility model Figure 3 Schematic diagram of the structure after high-pressure oil is injected.

[0032] Explanation of the labels in the diagram:

[0033] 1. Hydraulic cylinder body; 2. High-pressure oil inlet; 3. Piston assembly; 31. Piston body; 32. Piston rod; 4. Tension sleeve; 41. Anti-rotation groove; 5. Reaction nut; 6. Quick-connect coupling; 7. Handle. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] Example

[0036] like Figure 1-4 As shown, an integrated hydraulic tensioner for marine low-speed diesel engines includes:

[0037] Hydraulic cylinder body 1, which is a hollow cylindrical structure with one end closed, and a high-pressure oil inlet 2 is provided on the side wall of hydraulic cylinder body 1.

[0038] A piston assembly 3 is provided in the hydraulic cylinder body 1. The piston assembly 3 includes a piston body 31 that can reciprocate within the cylinder body. A piston rod 32 is connected to the piston body 31. The piston rod 32 extends from the central hole of the hydraulic cylinder body 1 to the outside of the hydraulic cylinder body 1.

[0039] A tension sleeve 4 is fixedly connected to one end of the piston rod 32 away from the piston body 31, and the tension sleeve 4 is provided with internal threads;

[0040] The hydraulic cylinder body 1 has a reaction nut 5 connected to its outer circumferential thread.

[0041] The hydraulic cylinder 1 and the tension sleeve 4 are rigidly integrated through the piston rod 32, forming an integrally movable tensioning mechanism.

[0042] In a further embodiment, the hydraulic cylinder body 1 provides a sealed hydraulic chamber as the main working space for hydraulic pressure action, which cooperates with the piston assembly 3 to form a pressure chamber for hydraulic drive; the high-pressure oil inlet 2 is used to connect to an external hydraulic pump system to inject high-pressure hydraulic oil into the hydraulic cylinder body 1, driving the piston assembly 3 to work; the piston assembly 3 generates reciprocating motion through the pressure of the hydraulic oil, realizing the transmission and conversion of force, thereby driving the tension sleeve 4 to perform a tensioning operation; wherein the piston body 31 reciprocates axially inside the hydraulic cylinder body 1, and the piston rod 32 is connected to the piston body 31 to bear the load. The movement of the piston rod 32 drives the fixedly connected tension sleeve 4 to perform a corresponding tensioning action. The tension sleeve 4 converts the displacement of the piston rod 32 into a tensioning force on the bolt. When tightening, it keeps the bolt in a tensioned state, which facilitates high-precision installation and improves the reliability and consistency of the large bolt connection of the diesel engine. The reaction nut 5 is set at the bottom of the hydraulic cylinder body 1 and supported on the connected part (such as the cylinder head). It provides reaction force support for the hydraulic cylinder body 1 during the tensioning process, ensures the stability of the hydraulic tensioner, prevents the hydraulic cylinder body 1 from moving as a whole, and ensures the directionality and efficiency of the tensioning.

[0043] The integrated hydraulic tensioner design makes the hydraulic cylinder 1, piston assembly 3, piston rod 32 and tension sleeve 4 form a tightly integrated whole. The mechanical force generated by the hydraulic oil driving piston assembly 3 pushes piston rod 32, thereby driving the movement of tension sleeve 4 to complete the tensioning work of marine low-speed diesel engine. The addition of reaction nut 5 ensures the stability and safety of operation and prevents over-stretching or equipment instability.

[0044] Specifically, the high-pressure oil inlet 2 is equipped with a quick-connect fitting 6 for easy connection to an external hydraulic pump.

[0045] In a further embodiment, the quick-connect coupling 6 is designed to facilitate connection with an external hydraulic pump. The design of the quick-connect coupling 6 greatly simplifies the connection process of the hydraulic system, allowing operators to quickly connect or disconnect from the external hydraulic pump, saving time and improving work efficiency. The quick-connect coupling 6 typically has an automatic locking function to ensure that it is not easily loosened during connection, thereby ensuring the stability and safety of the hydraulic oil flow and avoiding leakage or accidents caused by loose connection.

[0046] Specifically, the tension sleeve 4 is provided with an anti-rotation groove 41 for installing an auxiliary wrench to prevent rotation.

[0047] In a further embodiment, the auxiliary wrench can be inserted into the anti-rotation slot 41 to prevent the tension sleeve 4 from rotating during operation, ensuring that the tension sleeve 4 is stably fixed when tension force is applied. The anti-rotation slot 41, in conjunction with the auxiliary wrench, restricts the rotational movement of the tension sleeve 4, avoiding unstable tensioning effect or failure to reach the expected force value due to the rotation of the tension sleeve 4 during the tensioning operation.

[0048] Specifically, the reaction nut 5 has a double-threaded structure, which can quickly adjust the height and adapt to different models of diesel engine cylinder blocks.

[0049] In a further embodiment, the reaction nut 5 adopts a double-threaded structure. This design allows the reaction nut 5 to be height-adjusted as needed when the hydraulic tensioner is working. The double-threaded structure enables the rapid lifting and lowering adjustment of the reaction nut 5. Its height can be precisely adjusted by simply rotating the reaction nut 5 to adapt to the needs of different diesel engine cylinder blocks.

[0050] Specifically, the hydraulic cylinder body 1 is provided with a handle 7 on the outside, and the handle 7 is covered with a rubber pad.

[0051] In a further embodiment, a carrying handle 7 is mounted on the outside of the hydraulic cylinder body 1, providing a gripping point for the operator to manually move or adjust the position of the hydraulic tensioner, so that the operator can easily move the hydraulic tensioner when it is not connected to external equipment. A rubber pad is wrapped around the surface of the carrying handle 7, providing additional comfort and grip stability.

[0052] Specifically, the tension sleeve 4 is connected to the bolt to be tensioned via a threaded connection.

[0053] In a further embodiment, the tension sleeve 4 is threadedly connected to the bolt to be tensioned. This connection method ensures that the tension sleeve 4 can fit tightly with the bolt and transmit tensile force. The internal thread of the tension sleeve 4 is precisely matched with the external thread of the bolt, so that the two can be firmly connected when performing the tensioning task and can withstand the tensile load during operation. In the application of hydraulic tensioners, the bolts to be tensioned refer to those bolts that bear large loads or require precise pre-tightening in equipment or structures. During installation or maintenance, a tensile force needs to be applied to these bolts by a hydraulic tensioner to bring the bolts to an appropriate tension state.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. An integrated hydraulic tensioner for a marine low speed diesel engine, characterized in that, Include: Hydraulic cylinder (1), the hydraulic cylinder (1) is a hollow cylindrical structure with one end closed, the side wall of the hydraulic cylinder (1) is provided with high pressure oil inlet (2); The hydraulic cylinder (1) is provided with a piston assembly (3), the piston assembly (3) includes a piston body (31) which can reciprocate in the cylinder, the piston body (31) is connected with a piston rod (32), the piston rod (32) extends from the center hole of the hydraulic cylinder (1) to the outside of the hydraulic cylinder (1); The end of the piston rod (32) away from the piston body (31) is provided with a fixed connection of the stretching sleeve (4), the stretching sleeve (4) is provided with internal threads; The outer periphery of the hydraulic cylinder (1) is threadedly connected with a reaction nut (5); The hydraulic cylinder (1) and the stretching sleeve (4) are rigidly and integrally connected through the piston rod (32) to form a whole movable stretching mechanism.

2. An integrated hydraulic tensioner for a marine low speed diesel engine according to claim 1, characterized in that: The high pressure oil inlet (2) is provided with a quick plug type connector (6) for convenient connection with the external hydraulic pump.

3. An integrated hydraulic tensioner for a marine low speed diesel engine according to claim 1, characterized in that: The stretching sleeve (4) is provided with an anti-rotation clamping groove (41) outside for installing an auxiliary wrench to prevent rotation.

4. An integrated hydraulic tensioner for a marine low speed diesel engine according to claim 1, characterized in that: The reaction nut (5) is a double threaded structure, which can quickly adjust the height and adapt to different models of diesel engine cylinder.

5. An integrated hydraulic tensioner for a marine low speed diesel engine according to claim 1, characterized in that: The hydraulic cylinder (1) is provided with a hand handle (7) outside, and the hand handle (7) is wrapped with a rubber pad.

6. An integrated hydraulic tensioner for a marine low speed diesel engine according to claim 1, characterized in that: The stretching sleeve (4) is connected with the bolt to be stretched through thread cooperation.

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