Hoisting tool and method for dual-fuel diesel engine cylinder block

Abstract

The application discloses a hoisting tool and method for a dual-fuel diesel engine cylinder block, and the tool comprises a load-bearing frame, a first cross rail is arranged on the load-bearing frame, a moving trolley is arranged on the first cross rail, a hoisting cable with a hook is arranged on the moving trolley through a winding mechanism, and a weight sensor is arranged on the hook; a second cross rail parallel to the first cross rail is arranged below the first cross rail, a synchronous trolley synchronously moving with the moving trolley is arranged on the second cross rail, a plurality of telescopic pieces are vertically arranged on the synchronous trolley, a supporting block is arranged on the top of each telescopic piece, and a distance sensor for detecting the vertical distance between the supporting block and the surface of the cylinder block is arranged on each supporting block; and the tool further comprises a controller. The hoisting tool is equipped with a protection mechanism, can effectively support the cylinder block when the cylinder block accidentally falls during hoisting, and the supporting structure adopted helps to maximally reduce the impact force and provide multiple buffering effects, so that the impact damage to the cylinder block is reduced.

Description

Technical Field

[0001] This invention relates to the field of diesel engine hoisting equipment technology, specifically to hoisting fixtures and methods for dual-fuel diesel engine cylinder blocks. Background Technology

[0002] With increasingly stringent environmental protection requirements, dual-fuel (natural gas / diesel) diesel engines have emerged. The cylinder block is the main component of a dual-fuel diesel engine, weighing several tons or even tens of tons. During the production process, the cylinder block requires multiple lifting operations using tooling. Chinese patent document CN219341473U discloses a diesel engine cylinder block lifting device, which can perform basic lifting work; however, it lacks any protective measures. Due to the significant weight of the cylinder block, there is a risk of it detaching during lifting, causing it to fall and be damaged. Summary of the Invention

[0003] The purpose of this invention is to provide a hoisting fixture and method for dual-fuel diesel engine cylinder blocks, which solves the problem that existing hoisting fixtures pose a risk of cylinder blocks detaching and falling off during hoisting, resulting in impact damage.

[0004] The present invention achieves the above objectives through the following technical solutions:

[0005] A hoisting fixture for a dual-fuel diesel engine cylinder block includes a load-bearing frame, a first horizontal rail on the load-bearing frame, a moving trolley on the first horizontal rail, a sling with a hook on the moving trolley via a winding mechanism, and a weight sensor on the hook for detecting the hoisting weight.

[0006] Below the first horizontal rail is a second horizontal rail parallel to the first horizontal rail. On the second horizontal rail is a synchronous trolley that moves synchronously with the moving trolley and is always located directly below the moving trolley. Several telescopic components are vertically installed on the synchronous trolley. Each telescopic component has a support block on its top. Each support block has a distance sensor for detecting the vertical distance between the support block and the cylinder block surface.

[0007] The tooling also includes a controller configured to: when the hoisting weight is higher than a threshold, control all telescopic components to extend or retract so that the vertical distance between each support block and the cylinder body surface is equal to a first distance; and when the hoisting weight is lower than the threshold, control all telescopic components to extend so that the vertical distance between each support block and the cylinder body surface is shortened to a second distance and then stop extending, wherein the first distance is greater than the second distance.

[0008] A further improvement is that the movement of the mobile trolley and the synchronous trolley is uniformly controlled by the controller.

[0009] A further improvement is that both the first and second distances are preset by the controller, with the first distance being greater than 150cm and the second distance being less than 20cm.

[0010] A further improvement is that the telescopic component is provided with a mounting bracket at the top, the mounting bracket has a groove at the top, a vertically penetrating movable rod is provided in the groove, and a first spring is sleeved on the outside of the movable rod, and the support block is installed on the top of the movable rod.

[0011] A further improvement is that the telescopic component includes an outer tube mounted on a synchronous trolley and an inner tube that is movably sleeved with the outer tube. A sealed hydraulic cavity is formed between the outer tube and the inner tube. The hydraulic cavity is connected to a hydraulic medium source through a pipeline, and a liquid pump controlled by a controller is provided on the pipeline.

[0012] A further improvement is that the top of the inner tube is provided with a drain cylinder, and a drain column is slidably provided inside the drain cylinder. The drain column is hollow inside, and the upper part of the drain column extends out of the drain cylinder and is connected to a return pipe on the side wall. The return pipe is connected to a hydraulic medium source, and several flow holes are opened on the lower side wall of the drain column.

[0013] The bottom of the outer tube is provided with a pressure stabilizing cylinder, and a pressure stabilizing column with the same cross-sectional area as the drain column is slidably provided in the pressure stabilizing cylinder. The top end of the pressure stabilizing column is connected to the bottom end of the drain column through a linkage rod. The pressure stabilizing cylinder forms a movable cavity below the pressure stabilizing column that is separated from the hydraulic cavity but connected to the outside. A second spring for supporting the pressure stabilizing column is provided in the movable cavity.

[0014] The present invention also provides a method for lifting a cylinder block of a dual-fuel diesel engine, which utilizes the above-mentioned lifting fixture and includes the following steps:

[0015] The cylinder block of the dual-fuel diesel engine is tied with steel rope and suspended on the hook. The controller controls the moving trolley to move along the first horizontal rail to realize the lifting and transportation of the cylinder block.

[0016] During the hoisting process, the controller controls the synchronous trolley to move along the second horizontal rail, so that the synchronous trolley is always located directly below the moving trolley, and the weight of the hook is detected in real time by the weight sensor;

[0017] When the lifting weight is higher than the threshold, it indicates that the cylinder body is being lifted normally. The support block is not pressed down. The second spring supports the drain column in the drain cylinder through the pressure stabilizing column and the linkage rod. The flow hole on the drain column is blocked by the drain cylinder. At this time, the hydraulic chamber is in a non-draining state. The controller controls all telescopic parts to extend and retract so that the vertical distance between each support block and the surface of the cylinder body is equal to the first distance.

[0018] When the lifting weight is below the threshold, it indicates that the cylinder body has fallen. At this time, the controller controls all telescopic components to extend so that the vertical distance between each support block and the surface of the cylinder body is shortened to the second distance and then the extension stops. Then, the cylinder body contacts the support block, causing the support block to press down, which drives the first spring to compress and the movable rod to move down. This causes the bottom end of the movable rod to push the drain column down and gradually leak out into the drain cylinder. During the downward movement, the linkage rod drives the pressure stabilizing column down and gradually retracts into the pressure stabilizing cylinder to maintain a constant pressure in the hydraulic chamber until the flow hole on the drain column extends out of the drain cylinder. At this time, the hydraulic chamber is in a drainable state. The telescopic components gradually shorten under the gravity of the cylinder body until the cylinder body comes to a stop.

[0019] The beneficial effects of the present invention are as follows: the hoisting fixture is equipped with a protective mechanism, which can effectively support the cylinder body when it is accidentally dropped during the hoisting process, and the support structure adopted helps to minimize the impact force and provides multiple buffering effects, thereby reducing impact damage to the cylinder body. Attached Figure Description

[0020] Figure 1 A schematic diagram of the hoisting fixture for a dual-fuel diesel engine cylinder block;

[0021] Figure 2 This is a schematic diagram of the mobile cart.

[0022] Figure 3 This is a schematic diagram of the telescopic component structure when the support block is not pressed down;

[0023] Figure 4 This is a schematic diagram of the telescopic component structure when the support block is pressed down;

[0024] In the diagram: 1. Load-bearing frame; 2. First cross rail; 3. Moving trolley; 4. Winding mechanism; 5. Hook; 6. Weight sensor; 7. Second cross rail; 8. Synchronous trolley; 9. Telescopic component; 901. Outer tube; 902. Inner tube; 903. Hydraulic chamber; 904. Hydraulic medium source; 905. Liquid pump; 906. Drain cylinder; 907. Drain column; 908. Return pipe; 909. Flow hole; 910. Pressure stabilizing cylinder; 911. Pressure stabilizing column; 912. Linkage rod; 913. Movable chamber; 914. Second spring; 10. Support block; 11. Distance sensor; 12. Controller; 13. Mounting bracket; 14. Groove; 15. Movable rod; 16. First spring. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Combination Figure 1-4 As shown, the hoisting fixture for the cylinder block of a dual-fuel diesel engine includes a load-bearing frame 1, a first horizontal rail 2 on the load-bearing frame 1, the first horizontal rail 2 being a double rail, a moving trolley 3 on the first horizontal rail 2, the moving trolley 3 cooperating with the first horizontal rail 2 via rollers driven by a motor, and a sling with a hook 5 on the moving trolley 3 via a winding mechanism 4, the hook 5 being equipped with a weight sensor 6 for detecting the hoisting weight of the hook 5;

[0027] Below the first horizontal rail 2, there is a second horizontal rail 7 parallel to the first horizontal rail 2. On the second horizontal rail 7, there is a synchronous trolley 8 that moves synchronously with the moving trolley 3 and is always located directly below the moving trolley 3. Several telescopic components 9 are vertically installed on the synchronous trolley 8. Each telescopic component 9 has a support block 10 on its top. Each support block 10 has a distance sensor 11 for detecting the vertical distance between the support block 10 and the cylinder block surface.

[0028] The tooling also includes a controller 12, which is configured to: when the hoisting weight is higher than a threshold, control all telescopic components 9 to extend or retract so that the vertical distance between each support block 10 and the cylinder body surface is equal to a first distance; and when the hoisting weight is lower than the threshold, control all telescopic components 9 to extend so that the vertical distance between each support block 10 and the cylinder body surface is shortened to a second distance and then stop extending, wherein the first distance is greater than the second distance.

[0029] It should be noted that the threshold for lifting weight can be set according to a certain proportion of the total weight of the cylinder body. For example, if the total weight is 8t and the proportion is 0.8, the threshold can be set to 6.4t. The first distance and the second distance can be preset by the controller 12 as needed, and the first distance is greater than 150cm, for example, 160cm, and the second distance is less than 20cm, for example, 15cm.

[0030] Preferably, in this invention, the movement of the mobile trolley 3 and the synchronous trolley 8 is uniformly controlled by the controller 12.

[0031] Preferably, in this invention, the telescopic member 9 has a mounting bracket 13 at its top, and a groove 14 is formed at the top of the mounting bracket 13. A vertically penetrating movable rod 15 is provided in the groove 14, and a first spring 16 is sleeved on the outside of the movable rod 15. The support block 10 is installed on the top of the movable rod 15. By setting the first spring 16, it can be compressed after the cylinder body contacts the support block 10, providing a buffering effect.

[0032] Preferably, in this invention, the telescopic component 9 includes an outer tube 901 mounted on the synchronous trolley 8 and an inner tube 902 movably sleeved with the outer tube 901. A sealed hydraulic cavity 903 is formed between the outer tube 901 and the inner tube 902. The hydraulic cavity 903 is connected to a hydraulic medium source 904 (e.g., a hydraulic oil tank) via a pipe, and a liquid pump 905 controlled by a controller 12 is provided on the pipe. By pumping the hydraulic medium source 904 into the hydraulic cavity 903 by the liquid pump 905, the telescopic component 9 can be extended; by withdrawing the hydraulic medium source 904 from the hydraulic cavity 903, the telescopic component 9 can be shortened.

[0033] Preferably, in this invention, the top of the inner tube 902 is provided with a drain cylinder 906, and a drain column 907 is slidably provided inside the drain cylinder 906. The drain column 907 is hollow inside, and the upper part of the drain column 907 extends out of the drain cylinder 906 and is connected to a return pipe 908 on the side wall. The return pipe 908 is connected to the hydraulic medium source 904, and a plurality of flow holes 909 are opened on the lower side wall of the drain column 907.

[0034] The bottom of the outer tube 901 is provided with a pressure stabilizing cylinder 910. A pressure stabilizing column 911 with the same cross-sectional area as the drain column 907 is slidably provided in the pressure stabilizing cylinder 910. The top end of the pressure stabilizing column 911 is connected to the bottom end of the drain column 907 through a linkage rod 912. The pressure stabilizing cylinder 910 forms a movable cavity 913 below the pressure stabilizing column 911 that is separated from the hydraulic cavity 903 but connected to the outside. A second spring 914 for supporting the pressure stabilizing column 911 is provided in the movable cavity 913.

[0035] The present invention also provides a method for lifting a cylinder block of a dual-fuel diesel engine, which utilizes the above-mentioned lifting fixture and includes the following steps:

[0036] The cylinder block of the dual-fuel diesel engine is tied with a steel cable and suspended on the hook 5. The controller 12 controls the moving trolley 3 to move along the first horizontal rail 2 to realize the hoisting of the cylinder block.

[0037] During the hoisting process, the controller 12 controls the synchronous trolley 8 to move along the second horizontal rail 7, so that the synchronous trolley 8 is always located directly below the moving trolley 3, and the weight sensor 6 detects the hoisting weight of the hook 5 in real time. During normal hoisting, the hoisting weight will be stable at a certain value (or fluctuate slightly).

[0038] When the lifting weight exceeds the threshold, it indicates that the cylinder body is being lifted normally. The support block 10 is not pressed down. The second spring 914 supports the drain column 907 in the drain cylinder 906 through the pressure stabilizing column 911 and the linkage rod 912. The flow hole 909 on the drain column 907 is blocked by the drain cylinder 906. At this time, the hydraulic chamber 903 is in a non-draining state. The telescopic component 9 can only be controlled to extend and retract by the liquid pump 905, which facilitates precise control of the length of the telescopic component 9. At this time, the controller 12 controls all telescopic components 9 to extend and retract so that the vertical distance between each support block 10 and the cylinder body surface is equal to the first distance. This makes the distance from the cylinder body relatively far, which facilitates the corresponding production operations of the cylinder body.

[0039] When the hoisting weight is below the threshold, it indicates that the cylinder body has fallen (the hoisting weight instantly drops below the threshold). At this time, the controller 12 controls all telescopic components 9 to extend so that the vertical distance between each support block 10 and the cylinder body surface is shortened to the second distance and then the extension stops. In this way, the cylinder body can be supported by multiple support blocks 10, and the falling distance is short, so there will be no large impact force and the cylinder body will not be damaged. In addition, since the vertical distance between each support block 10 and the cylinder body surface is equal before and after, the extension stroke and time required for each telescopic component 9 are theoretically the same. This makes it easy to reach the support position uniformly and finally contact the cylinder body surface at almost the same time, so as to distribute the force evenly.

[0040] As the cylinder body falls, it then contacts the support block 10, causing the support block 10 to press down. At this time, since the telescopic component 9 cannot retract freely, it will cause the first spring 16 to compress and the movable rod 15 to move downward. The first spring 16 provides the first impact buffering effect, and causes the bottom end of the movable rod 15 to push the drain column 907 downward and gradually leak out into the drain cylinder 906. During the downward movement, the linkage rod 912 drives the pressure stabilizing column 911 to move downward and gradually retract into the pressure stabilizing cylinder 910, and the second spring 914 retracts, providing the second impact buffering effect and maintaining a constant pressure in the hydraulic chamber 903 (the principle is: the volume of the drain column 907 leaking out and the volume of the pressure stabilizing column 911 retracting). The volume is equal, ensuring that the overall volume of the hydraulic chamber 903 remains constant and the pressure is constant (otherwise, the drain column 907 could not move down). The pressure continues until the flow hole 909 on the drain column 907 extends out of the drain cylinder 906. At this point, the hydraulic chamber 903 is in a drainable state. The cylinder body continues to press down on the support block 10 until the first spring 16 can no longer retract (the groove 14 supports the support block 10). This transfers force to the telescopic component 9, causing the liquid in the hydraulic chamber 903 to be squeezed and flow back through the flow hole 909, the interior of the drain column 907, and the return pipe 908 to the hydraulic medium source 904. Under the weight of the cylinder body, the telescopic component 9 gradually shortens, providing a third impact buffering effect. Finally, the cylinder body falls smoothly with short-distance impact and multiple buffering effects until it comes to a stop.

[0041] In addition, since the cylinder body is relatively heavy, the linkage rod 912, which is located at the axis of the telescopic component 9, can also play a guiding and stabilizing role, thereby improving the working stability of the telescopic component 9.

[0042] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A lifting tool for a dual fuel diesel engine cylinder block, the tool comprising a load bearing frame (1), characterised in that, The load-bearing frame (1) is provided with a first horizontal rail (2), and a moving trolley (3) is provided on the first horizontal rail (2). The moving trolley (3) is provided with a sling with a hook (5) via a winding mechanism (4). The hook (5) is provided with a weight sensor (6) for detecting the lifting weight of the hook (5). Below the first horizontal rail (2) is a second horizontal rail (7) parallel to the first horizontal rail (2). On the second horizontal rail (7) is a synchronous trolley (8) that moves synchronously with the moving trolley (3) and is always located directly below the moving trolley (3). Several telescopic components (9) are vertically installed on the synchronous trolley (8). Each telescopic component (9) has a support block (10) on its top. Each support block (10) has a distance sensor (11) for detecting the vertical distance between the support block (10) and the cylinder body surface. The tooling also includes a controller (12) configured to: when the hoisting weight is higher than a threshold, control all telescopic components (9) to extend or retract so that the vertical distance between each support block (10) and the cylinder body surface is equal to a first distance; and when the hoisting weight is lower than the threshold, control all telescopic components (9) to extend so that the vertical distance between each support block (10) and the cylinder body surface is shortened to a second distance and then stop extending, wherein the first distance is greater than the second distance.

2. The hoisting fixture for the dual-fuel diesel engine cylinder block according to claim 1, characterized in that, The movement of the mobile trolley (3) and the synchronous trolley (8) is controlled by the controller (12).

3. The hoisting fixture for the dual-fuel diesel engine cylinder block according to claim 1, characterized in that, The first distance and the second distance are both preset by the controller (12), and the first distance is greater than 150cm and the second distance is less than 20cm.

4. The hoisting fixture for the dual-fuel diesel engine cylinder block according to claim 1, characterized in that, The telescopic component (9) is provided with a mounting bracket (13) at the top. The mounting bracket (13) forms a groove (14) at the top. A vertically penetrating movable rod (15) is provided in the groove (14), and a first spring (16) is sleeved on the outside of the movable rod (15). The support block (10) is installed on the top of the movable rod (15).

5. The hoisting fixture for the dual-fuel diesel engine cylinder block according to claim 4, characterized in that, The telescopic component (9) includes an outer tube (901) mounted on a synchronous trolley (8) and an inner tube (902) movably sleeved with the outer tube (901). A sealed hydraulic cavity (903) is formed between the outer tube (901) and the inner tube (902). The hydraulic cavity (903) is connected to a hydraulic medium source (904) through a pipeline, and a liquid pump (905) controlled by a controller (12) is provided on the pipeline.

6. The hoisting fixture for the dual-fuel diesel engine cylinder block according to claim 5, characterized in that, The inner tube (902) is provided with a drain cylinder (906) at the top, and a drain column (907) is slidably provided inside the drain cylinder (906). The drain column (907) is hollow inside, and the upper part of the drain column (907) extends out of the drain cylinder (906) and is connected to a return pipe (908) on the side wall. The return pipe (908) is connected to a hydraulic medium source (904). Several flow holes (909) are opened on the lower side wall of the drain column (907). The bottom of the outer tube (901) is provided with a pressure stabilizing cylinder (910). A pressure stabilizing column (911) with the same cross-sectional area as the drain column (907) is slidably provided in the pressure stabilizing cylinder (910). The top end of the pressure stabilizing column (911) is connected to the bottom end of the drain column (907) through a linkage rod (912). The pressure stabilizing cylinder (910) forms a movable cavity (913) below the pressure stabilizing column (911) that is separated from the hydraulic cavity (903) but connected to the outside. A second spring (914) for supporting the pressure stabilizing column (911) is provided in the movable cavity (913).

7. A method for lifting a cylinder block of a dual-fuel diesel engine, utilizing the lifting fixture described in claim 6, characterized in that the step... include: The cylinder block of the dual-fuel diesel engine is tied with a steel rope and suspended on the hook (5). The controller (12) controls the moving trolley (3) to move along the first horizontal rail (2) to realize the hoisting of the cylinder block. During the hoisting process, the synchronous trolley (8) is controlled by the controller (12) to move along the second horizontal rail (7), so that the synchronous trolley (8) is always located directly below the moving trolley (3), and the hoisting weight of the hook (5) is detected in real time by the weight sensor (6); When the lifting weight is higher than the threshold, it indicates that the cylinder body is being lifted normally. The support block (10) is not pressed down. The second spring (914) supports the drain column (907) in the drain cylinder (906) through the pressure stabilizing column (911) and the linkage rod (912). The flow hole (909) on the drain column (907) is blocked by the drain cylinder (906). At this time, the hydraulic chamber (903) is in a non-draining state. The controller (12) controls all telescopic parts (9) to extend and retract so that the vertical distance between each support block (10) and the cylinder body surface is equal to the first distance. When the hoisting weight is below the threshold, it indicates that the cylinder body has fallen. At this time, the controller (12) controls all telescopic parts (9) to extend so that the vertical distance between each support block (10) and the surface of the cylinder body is shortened to the second distance and the extension stops. Then the cylinder body contacts the support block (10) so that the support block (10) is pressed down, which drives the first spring (16) to compress and the movable rod (15) to move down, so that the bottom end of the movable rod (15) pushes the drain column (907) down. The fluid gradually leaks out into the drain cylinder (906). During the downward movement, the pressure stabilizing column (911) is driven to move down through the linkage rod (912) and gradually retract into the pressure stabilizing cylinder (910) to maintain a constant pressure in the hydraulic chamber (903) until the flow hole (909) on the drain column (907) extends out of the drain cylinder (906). At this time, the hydraulic chamber (903) is in a drainable state. The telescopic component (9) gradually shortens under the gravity of the cylinder body until the cylinder body stops.

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