Engine lifting appliance with gravity center adjusting function

Abstract

The invention discloses an engine lifting appliance with a gravity center adjusting function, and relates to the technical field of engine lifting appliances, the lifting appliance comprises a plurality of balance lifting arms in different shapes, the balance lifting arms are all connected to a supporting rod, the supporting rod is hung in front of and behind an engine, the gravity distributed on the two sides of the supporting rod is the same, and the supporting rod is always kept horizontal. According to the engine lifting appliance with the gravity center adjusting function, the sliding guide rod with the springs serves as a sliding foundation of the supporting rod, so that the supporting rod can slide on the balance lifting arm to change the position of a fulcrum, the gravity center adjusting function is achieved, and at the moment, the springs at the two ends of the supporting rod are pulled and extruded; therefore, the lifting appliance can be reset under the action of traction force of the spring, balance of the lifting appliance in the state that an engine is not hung is kept, the technical problem that an existing engine lifting appliance is poor in stability in use is effectively solved, the purpose of keeping balance of the lifting appliance all the time is achieved, and the stability of the lifting appliance is met.

Description

Technical Field

[0001] This invention relates to the field of engine lifting equipment technology, and in particular to an engine lifting equipment with a center of gravity adjustment function. Background Technology

[0002] Engine hoists are specialized tools used for lifting engines during installation or disassembly. Currently, there are many types and models of engines, resulting in a large number of engine models and quantities, which causes considerable waste and inconvenience in the process of supporting multiple engine models.

[0003] Currently, Chinese patent application number CN202321503182.5 discloses a multi-engine and APU integrated lifting device. Its technical solution includes: a lifting beam with a crossbeam on one side, lifting lugs on the outer ring of the crossbeam, a lead screw inside the lifting lugs, multiple lifting noses below the lifting beam, center of gravity markings for different engine models on the crossbeam, and multiple dimensional positioning holes on both sides of the crossbeam. Although the lifting lugs can be quickly adjusted using the lead screw, and the dimensions and lifting center of gravity of different engine and APU models can be marked using the multiple center of gravity markings and dimensional positioning holes, the device requires adjusting the length of the crossbeams at both ends of the lifting lugs to achieve center of gravity balance. This causes the lifting device's own center of gravity to shift, resulting in a tilted state when the engine is not suspended, affecting the ease of use and stability of the lifting device.

[0004] However, during the implementation of the above technical solution, at least the following technical problems were discovered:

[0005] Poor stability and easy damage to the engine: Existing engine lifting tools, in order to ensure that the engine does not tilt after being lifted, are pre-adjusted according to the engine's center of gravity distribution, forming a lever state with one end longer than the other. When lifting the engine, the principle of multiplying the weight of the chain at the location by the length of the lever arm at that end is used to achieve a balanced state by simply adjusting the position of the fulcrum. However, this also introduces a new problem: the balance of the clamp itself. Because the lever arm lengths at both ends of the lifting tool change to ensure the engine's balance, the lifting tool itself tilts. As a result, when connecting the hook on the lifting tool to the engine, the chain needs to be manually pulled to adjust the balance of the lifting tool. Secondly, since the hook on the lifting tool corresponds to the "connection point" on the engine, and the chain will sway during movement, when the lifting tool moves to the engine, the chain will come into contact with the outer wall of the engine, causing impact to the outer wall of the engine, resulting in wear, dents, or even damage to the engine. To address this, we propose an engine lifting tool with a center of gravity adjustment function. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides an engine hoist with a center of gravity adjustment function. By utilizing a sliding guide rod with springs as the basic structure for the sliding of the support rod, the support rod can slide on the balance boom to change the fulcrum position of the balance boom, thereby fulfilling the function of center of gravity adjustment. At this time, one spring at each end of the support rod is pulled and the other is compressed, so the support rod can be reset under the traction force of the springs. This ensures that the hoist can maintain balance even when the engine is not suspended, solving the technical problem that existing engine hoists have poor stability and are prone to damaging the engine during use.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An engine lifting device with a center of gravity adjustment function, the lifting device comprising:

[0011] Support rod;

[0012] Multiple balance booms of different shapes are connected to the support rod. One end of the chain is connected to the balance boom, and the other end is connected to the engine.

[0013] The support rod suspends the engine from the front and rear, and the weight distributed on both sides of the support rod is the same, so the support rod always remains horizontal.

[0014] Preferably, the balance boom is provided with multiple hanging points, and the chain can be hung on different hanging points according to the gravity distribution of the engine to adjust the center of gravity position after suspending the engine.

[0015] Preferably, the balance boom is provided with an adjustment component inside, which can be used to adjust the connection point between the support rod and the balance boom, and adjust the length of the balance boom distributed on both sides of the support rod;

[0016] The adjustment assembly includes a sliding guide rod disposed inside the balance boom, the support rod is slidably connected to the sliding guide rod, and the support rod can slide along the length direction of the sliding guide rod.

[0017] Preferably, the top of the support rod is provided with an embedding groove, and a limiting cover is connected to the middle of the embedding groove. The number of sliding guide rods is two sets, and they are located on both sides of the limiting cover, respectively.

[0018] When the support rod is connected to the balance boom, the limiting cover is embedded inside the balance boom.

[0019] Preferably, the end of the sliding guide rod is connected to a head seat, and the sliding guide rod is connected to one end of the chain through the head seat. The head seat and the limiting cover are connected by a spring, and the spring is always in a stretched state.

[0020] The springs on both sets of sliding guide rods are connected to the same limiting cover and are distributed on both sides of the limiting cover. Under the elastic force of the springs, the sliding guide rods drive the chain to move into the interior of the balance arm until the end of the sliding guide rod is in contact with the interior of the balance arm. At the same time, the support rod is pushed towards the center of the balance arm.

[0021] Preferably, the sliding guide rod is fitted with a limiting component that can be adjusted along the length of the sliding guide rod; when the chain is pulled outward, both limiting components move in the direction of the support rod, limiting the range of motion of the support rod.

[0022] Preferably, the limiting component includes a sleeve seat sleeved on the sliding guide rod, and a snap-fit ​​plate is inserted into the center of the sleeve seat, the snap-fit ​​plate being able to engage with the teeth on the inner wall of the sliding guide rod.

[0023] When the snap-fit ​​plate is retracted into the sleeve seat, the sleeve seat can slide along the sliding guide rod; conversely, when the snap-fit ​​plate is inserted into the gap between two adjacent teeth, the sleeve seat cannot slide along the sliding guide rod.

[0024] Preferably, an outward extension tube is hinged to the bottom of the balance boom and near both ends, and the outward extension tube is connected to the balance boom by a torsion spring. The end of the outward extension tube extends outward under the action of the torsion spring.

[0025] The balance boom is provided with a connecting groove at the position corresponding to the outward tube. The chain enters the outward tube along the connecting groove and extends out from the other end of the outward tube.

[0026] (III) Beneficial Effects

[0027] 1. By employing a spring-loaded sliding guide rod as the basic structure for the support rod's sliding motion, the support rod can slide on the balance boom to change the fulcrum position of the balance boom, thus fulfilling the function of center of gravity adjustment. At this time, one spring at each end of the support rod is pulled while the other is compressed, allowing the support rod to reset under the traction force of the springs. This ensures the spreader remains balanced even without the engine suspended, effectively solving the problem of poor stability in existing engine spreaders. It achieves the goal of maintaining spreader balance at all times, ensuring stability and facilitating traction and connection to the engine. Secondly, by connecting a chain to the end of the sliding guide rod, the chain can move the sliding guide rod synchronously when pulled. Furthermore, by fitting a sleeve onto the sliding guide rod and adjusting its position, the sleeve moves towards the support rod as the sliding guide rod moves. This not only limits the support rod's movement but also moves it, achieving a reset function. This allows the spreader to return to its original balanced position after connection to the engine, facilitating repeated and efficient use.

[0028] 2. By connecting an outward extension tube hinged to each end of the balance boom, and with a torsion spring connecting the outward extension tube to the balance boom, the chain can be retracted when the engine is not suspended, and simultaneously extended outward under the action of the torsion spring. This prevents the chain from damaging or colliding with the engine surface when it moves above the engine with the lifting device. Therefore, it effectively solves the technical problem that existing engine lifting devices are prone to damaging the engine during use, thereby achieving the purpose of safely lifting the engine and improving the safety and stability of the lifting device. Attached Figure Description

[0029] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is an overall structural diagram of Embodiment 1 of the present invention;

[0031] Figure 2 This is an overall structural diagram of Embodiment 2 of the present invention;

[0032] Figure 3 This is a schematic diagram of the front and back structures of the balance boom in Embodiment 2 of the present invention;

[0033] Figure 4 This is a schematic diagram of the first segment under the traction state of the suspension chain in Embodiment 2 of the present invention;

[0034] Figure 5This is a schematic diagram of the second segment under the traction state of the suspension chain in Embodiment 2 of the present invention;

[0035] Figure 6 This is a schematic diagram of the position of the sliding guide rod in the state of not suspending the engine in Embodiment 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of the sliding guide rod in the first segment under traction state in Embodiment 2 of the present invention;

[0037] Figure 8 This is a schematic diagram of the sliding guide rod in the second section under traction state in Embodiment 2 of the present invention;

[0038] Figure 9 This is a schematic diagram of the sliding guide rod connection structure in Embodiment 2 of the present invention;

[0039] Figure 10 This is a schematic diagram of the end structure of the support rod in Embodiment 2 of the present invention;

[0040] Figure 11 This is one of the state diagrams of the limiting component in Embodiment 2 of the present invention;

[0041] Figure 12 This is a schematic diagram of the state of the limiting component in Embodiment 2 of the present invention;

[0042] Figure 13 This is a cross-sectional view of the limiting component in Embodiment 2 of the present invention.

[0043] Legend:

[0044] 11. Support rod; 12. Clearance arc; 13. Balance boom; 14. Lifting lug; 15. Lifting chain; 16. Hook; 17. Limit cover; 18. Connecting seat;

[0045] 21. Outer tube; 22. Hinge; 23. Torsion spring; 24. Outer roller; 25. Inner roller; 26. Connecting groove;

[0046] 31. Sliding guide rod; 32. End cap seat; 33. Hanging rod; 34. Tooth;

[0047] 4. Limiting component; 41. Sleeve seat; 42. Connecting rod; 43. Snap-fit ​​plate; 44. Connecting seat; 45. Finger pressure head. Detailed Implementation

[0048] This application provides an engine hoist with a center of gravity adjustment function, effectively solving the technical problems of poor stability and easy damage to the engine in existing engine hoists. By using a spring-loaded sliding guide rod as the basic structure for the sliding support rod, the support rod can slide on the balance boom to change the fulcrum position of the balance boom, thereby fulfilling the center of gravity adjustment function. At this time, one spring at each end of the support rod is pulled while the other is compressed, thus allowing the support rod to be reset under the traction force of the spring. This ensures that the hoist remains balanced even when the engine is not suspended, thereby achieving… The system aims to maintain the balance of the spreader at all times to ensure its stability, facilitate traction, and allow for connection to the engine. Secondly, by connecting a chain to the end of the sliding guide rod, the chain pulls, causing the sliding guide rod to move synchronously. Then, by fitting a sleeve onto the sliding guide rod and adjusting its position, the sleeve moves towards the support rod as the guide rod moves. This not only limits the support rod's position but also moves it, thus achieving a reset function. This allows the system to restore the original balanced suspension position after connection to the engine, facilitating repeated and efficient use.

[0049] Example 1

[0050] The technical solution in this application embodiment effectively solves the technical problem of poor stability in the use of existing engine lifting devices. The overall idea is as follows:

[0051] To address the problems existing in the prior art, this invention provides an engine hoist with a center of gravity adjustment function. To solve the problem of the prop easily tilting when the engine is not suspended, we investigated two solutions, both of which can resolve this issue. One solution involves distributing multiple balancing booms 13 (each with several hanging points) on the support rod 11, arranged on both sides of the support rod 11 according to balance, thus achieving weight balance on both sides of the support rod 11. Then, by utilizing the positions of the hanging points on different balancing booms 13, chains are installed at different distances from the support rod 11 to adapt to different center of gravity distributions when the engine is suspended. Figure 1 As shown;

[0052] Another solution is to achieve balance through resetting, that is, by automatically restoring the initial balance position. Specifically: before suspending the engine, the support rod 11 is adjusted to balance. Then, when suspending the engine, the position of the fulcrum of the balance arm 13 is adjusted according to the engine's center of gravity distribution to meet the suspension requirements of engines of different weights. In the non-suspended state, the spring force is used to achieve resetting, allowing the support rod 11 and the balance arm 13 to regain balance. Details are as follows:

[0053] like Figure 1 As shown, a cylindrical rod-shaped structure (i.e., support rod 11) is used as the main body of the entire lifting device. In order to avoid interference, an avoidance arc 12 is set on the support rod 11, which also provides a basis for subsequent balance. The support rod 11 is connected to the external lifting device through the lifting lug 14 on it.

[0054] Multiple balance arms 13 are installed on the support rod 11, and the installation of the balance arms 13 follows the principle of balance, that is, after the balance arms 13 are installed, the support rod 11 can remain balanced (the center of gravity always remains on the support rod 11). The subsequently added balance arms 13 follow the principle of symmetrical balance, that is, if a balance arm 13 is installed on one side of the support rod 11, a balance arm 13 with "equivalent weight" needs to be installed on the other side of the support rod 11. By installing the balance arms 13 at different distances from the support rod 11, the gravitational influence on the support rod 11 can be changed to ensure that the support rod 11 always remains in a balanced state. The balance arms 13 have multiple hanging points, and the chain can be hung on different hanging points according to the weight distribution of the engine to adjust the center of gravity position after suspending the engine.

[0055] When in use, the installation position of the chain is determined according to the center of gravity of the engine. The chain is installed according to the principle of symmetrical balance, so that the support rod 11 can still maintain balance after the chain is installed. The chain consists of a hanging chain 15 and a hook 16 connected to the end of the hanging chain 15.

[0056] After the chain installation is complete, move the lifting device to the top of the engine. Then, hook the chain end 16 onto the designated hooking position on the outside of the engine. Lifting can then be performed using the lifting device. Since the chain on the balance boom 13 has already been positioned after determining the engine's center (e.g., ...), ... Figure 1 As shown, the positions of the chains were pre-distributed, so after the engine is lifted, the whole structure formed by the lifting device and the engine can still maintain balance and will not tilt.

[0057] Example 2

[0058] Based on Example 1, the embodiments of this application effectively solve the technical problem of poor stability of existing engine lifting devices during use. The overall concept is as follows:

[0059] The second option is to use the reset function to adjust the balance of the support rod 11. This allows for free adjustment regardless of the limitations of the adjustment position, based on the center of gravity distribution of different engines.

[0060] It mainly includes a fulcrum adjustment structure for adjusting the connection point between the support rod 11 and the balance boom 13, and a reset structure for resetting the support rod 11.

[0061] The fulcrum adjustment structure includes two parallel sliding guide rods 31, with the length direction of the sliding guide rods 31 aligned with the length direction of the balance arm 13. A groove is formed at the bottom of the balance arm 13. To connect the support rod 11 to the sliding guide rods 31 within the balance arm 13, an embedding groove is formed near the end of the support rod 11, and a T-shaped limiting cover 17 is installed in the embedding groove. This allows the balance arm 13 to be placed into the embedding groove during installation, aligning with the groove on the balance arm 13. Figure 3 and Figure 10 As shown, during the installation process, the limiting cover 17 is first placed into the sliding groove of the balance boom 13, and then the two sliding guide rods 31 are installed on both sides of the limiting cover 17, as shown. Figure 6 As shown; in order to prevent the sliding guide rod 31 from moving out of the groove at the bottom of the balance boom 13, a head seat 32 is connected to the end of the sliding guide rod 31, and the upper and lower surfaces of the head seat 32 are respectively in contact with the upper and lower inner walls of the balance boom 13 (the pulley on the head seat 32 is in contact with the inner wall of the balance boom 13 to reduce the friction when the sliding guide rod 31 slides), and the width of the head seat 32 is greater than the width of the groove. In this way, the sliding guide rod 31 can only slide in the balance boom 13 and cannot fall out of the groove, thereby ensuring the stability of the sliding guide rod 31 and providing a basis for subsequent traction and resetting.

[0062] After completion, place the balance boom 13 into the embedded groove on the surface of the support rod 11, and align the limiting cover 17 with the mating seat 18 in the embedded groove vertically (e.g., Figure 10 As shown in the diagram, the limiting cover 17 and the support rod 11 are finally connected together using bolts. The limiting cover 17 has pulleys, which can reduce the friction between the limiting cover 17 and the balance arm 13 when sliding, facilitating the relative sliding of the support rod 11 and the balance arm 13, thus completing the connection between the support rod 11 and the balance arm 13. Since the support rod 11 and the sliding guide rod 31 are slidably connected, the support rod 11 can slide along the length of the sliding guide rod 31, thereby changing the connection position between the support rod 11 and the balance arm 13. Since the balance arm 13 provides support through the support rod 11, when the position between the support rod 11 and the balance arm 13 changes, it also means that the fulcrum of the balance arm 13 changes. Thus, for the heavier center of gravity, the length of the balance arm 13 is reduced; conversely, it is lengthened on the other side. In this way, the balance of the engine suspension can be maintained, thereby adapting to various different engines.

[0063] Another point is the reset structure. To achieve the reset of the support rod 11, we mainly use a spring as the basis. The spring is sleeved on the outside of the sliding guide rod 31, and one end of the spring is connected to the vehicle limit cover 17, while the other end is connected to the end cap 32 at the end of the sliding guide rod 31. The spring is kept in a stretched state at all times. In this way, when the support rod 11 is not subjected to external force, it can move towards the end of the sliding guide rod 31 under the traction force of the spring. Using the same method, another spring is sleeved on the outside of the other sliding guide rod 31 and connected to the other side of the limit cover 17. This simultaneously acts on the limit cover 17, causing the support rod 11 with the limit cover 17 to move to the middle of the balance boom 13, thereby completing the reset of the support rod 11. In this way, after the lifting equipment is used, it can be reset directly without tilting, thus ensuring the stability and balance of the lifting equipment.

[0064] In addition, in order to automatically adjust the connection position between the support rod 11 and the balance arm 13 when the engine is suspended, the structure of the sliding guide rod 31 is adjusted. The length of the sliding guide rod 31 is reduced to be less than the length of the balance arm 13, but still greater than two-thirds of the length of the balance arm 13. The chain is then connected to the end cap 32 at the end of the sliding guide rod 31. Figure 9 As shown, the chain is connected to the hanging rod 33 on the end cap 32; in this way, when the chain is pulled (which can be triggered when the engine is suspended), it can drive the sliding guide rod 31 inside the balance boom 13 to move. Using this principle, the support rod 11 can be driven to move during the movement of the sliding guide rod 31.

[0065] This process will not affect the reset of support rod 11, as detailed below:

[0066] Under the elastic force of the spring, the sliding guide rod 31 drives the chain to move inward into the balance arm 13 until the end of the sliding guide rod 31 is in contact with the inside of the balance arm 13. Figures 8 to 7 As shown, the sliding guide rod 31 cannot move at this time, and the spring is not fully contracted. Therefore, it will still pull the support rod 11. Then, the support rod 11 will be pushed towards the center of the balance arm 13 under the action of the spring, thus completing the reset.

[0067] To utilize the gravity generated by the suspension engine to drive the movement of the sliding guide rods 31, a limiting structure (limiting component 4) is fitted around each of the two sliding guide rods 31. This limiting structure can move and adjust along the length of the sliding guide rod 31. When the chain is pulled outwards, both limiting components 4 move towards the support rod 11 under the action of the sliding guide rods 31, restricting the range of motion of the support rod 11. By simply adjusting the position of the limiting components 4, a pulling force can be applied to the support rod 11 under tension, causing the support rod 11 to move. Simultaneously, the clamping force between the two limiting components 4 restricts the position of the support rod 11, preventing it from shifting after movement. For example, if one of the limiting components 4 is installed close to the support rod 11, the sliding guide rod 31 will pull the support rod 11 along with it. The specific structure of the limiting component 4 is as follows:

[0068] The main structure consists of a sleeve seat 41 with a circular through hole, and a flat retaining plate 43 is inserted into the center of the sleeve seat 41. The retaining plate 43 corresponds to the elongated movable groove on the sliding guide rod 31. In order to restrict the movement of the sleeve seat 41, several teeth 34 are evenly distributed on the inner walls of both sides of the movable groove. Figure 11 and Figure 12 As shown, this restricts the movement of the sleeve seat 41 when the snap-fit ​​plate 43 is inserted into the gap between the teeth 34, thereby achieving the purpose of locking and limiting the component 4. Similarly, when the snap-fit ​​plate 43 is pulled apart from between the teeth 34, the limiting component 4 can continue to slide along the sliding guide rod 31 to satisfy the fixing and adjustment functions required by the limiting component 4. In order to stably adjust the movement state of the snap-fit ​​plate 43, a cylindrical connecting rod 42 is used to connect the snap-fit ​​plate 43 to the finger pressure head 45 outside the sleeve seat 41. The position of the snap plate 43 can be adjusted by pressing the finger pressure head 45, and a spring is connected between the finger pressure head 45 and the sleeve seat 41. The spring is always in a compressed state, so when the finger pressure head 45 is released, the spring can drive the finger pressure head 45 and the snap plate 43 to reset. In order to hold the index and middle fingers, a connecting seat 44 with grooves on both sides is provided at the bottom of the sleeve seat 41. The connecting seat 44 passes through the sliding groove at the bottom of the balance arm 13 and extends outward (extending to the outside of the balance arm 13 for easy external adjustment).

[0069] In use, pressing the acupressure head 45 at the bottom of the connecting seat 44 causes the acupressure head 45 to move the connecting rod 42 upwards, as shown. Figure 11As shown, at this time, the snap-fit ​​plate 43, which is inserted between the teeth 34, is retracted into the sleeve seat 41 under the action of the thrust. Then, the sleeve seat 41 can be slid along the sliding guide rod 31 to adjust the position of the sleeve seat 41. When it moves into place, the finger pressure head 45 is released. At this time, the finger pressure head 45 moves downward under the action of the spring, and the snap-fit ​​plate 43 connected to the finger pressure head 45 moves downward synchronously, thereby inserting into the teeth 34 in the movable groove. Figure 12 As shown, this completes the adjustment of the position of the sleeve seat 41, facilitating subsequent adjustments.

[0070] In the specific implementation process, the first step is to adjust the position of the sleeve seat 41, such as... Figure 6 As shown, by pressing the finger pressure head 45, the finger pressure head 45 causes the snap-fit ​​plate 43 to move upward, as... Figure 11 As shown, at this time, the snap-fit ​​plate 43 is retracted into the sleeve seat 41, allowing the sleeve seat 41 to slide along the sliding guide rod 31. When it moves to the designated position, the finger pressure head 45 is released. At this time, the finger pressure head 45 moves downward under the action of the spring, and the snap-fit ​​plate 43 connected to the finger pressure head 45 is inserted between the teeth 34, as shown. Figure 12 As shown, this completes the adjustment of the position of the sleeve seat 41.

[0071] The second step is to move the lifting device to the top of the engine and hook the hook on the device onto the designated hooking position on the engine. Then, control the lifting device to lift upwards. During the lifting process, the weight of the engine gradually acts on the chain at the end of the sliding guide rod 31, pulling it outwards. Since the other end of the chain is connected to the sliding guide rod 31, and the length of the sliding guide rod 31 is less than the length of the balance boom 13, the sliding guide rod 31 will move to one end under the pull of the chain when the chain is pulled. At this time, the sleeve seat 41 and the spring on the sliding guide rod 31 are pulled, forming a... Figure 7 As shown, since the sleeve seat 41 cannot slide, during the pulling process of the sliding guide rod 31, it drives the support rod 11 to move together towards the end of the balance boom 13 until the end of the sliding guide rod 31 abuts against the inner wall of the balance boom 13, forming a... Figure 8 As shown in the diagram, the balance adjustment during engine lifting is thus completed.

[0072] The third step involves transporting the engine to its designated location and then lowering it. During this process, the sliding guide rod 31, under the action of its spring, moves into the balance arm 13, causing the chain connected to the end of the sliding guide rod 31 to retract into the balance arm 13 until the end of the sliding guide rod 31 is flush with the interior of the balance arm 13. Figures 8 to 7As shown, the sliding guide rod 31 cannot move at this time, and the spring is not fully contracted. Therefore, it will still pull the support rod 11. Then, the support rod 11 will be pushed towards the center of the balance arm 13 under the action of the spring, thus completing the reset.

[0073] Example 3

[0074] Based on Example 2, the embodiments of this application effectively solve the technical problem that existing engine lifting devices are prone to damaging the engine during use. The overall concept is as follows:

[0075] Another major improvement we made was to prevent the chain from directly contacting the engine during transport. We installed an outward-extending tube 21 at the bottom of the balance boom 13, near both ends, via hinges 22. The outward-extending tube 21 is connected to the balance boom 13 by a torsion spring 23. Under the action of the torsion spring 23, the ends of the outward-extending tube 21 expand outwards when no external force is applied, forming a shape like... Figure 4 As shown in the upper part of the structure, the chain is pushed outwards. When the spreader moves above the engine, the chain will be distributed on the outside of the engine and will not come into contact with the engine, thus preventing the chain from damaging the engine.

[0076] When the chain is pulled, the tension on the chain will compress the outward-expanding tube 21, causing it to contract inward, such as... Figure 4 As shown, at this time, the torsion spring 23 between the outward extension tube 21 and the balance arm 13 will begin to store force, providing power for the subsequent unfolding of the chain. To facilitate the movement of the chain, an outer roller 24 is provided at the outlet of the outward extension tube 21, so that the chain will roll outward under the action of the outer roller 24, thereby reducing the friction during the chain movement; at the same time, an inner roller 25 is provided at the position of the balance arm 13 near the opening of the connecting groove 26, so as to prevent the chain from being stuck by the edge of the connecting groove 26 and the outward extension tube 21, thus improving the stability of the chain movement.

[0077] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An engine hoist with a center of gravity adjustment function, characterized in that, The lifting device includes: Support rod (11); The balance boom (13) is connected to the support rod (11) and is connected to the engine via a chain. After the chain is suspended, the chain and the support rod (11) combine to achieve balance. When the engine is suspended, the engine applies the same weight to both sides of the support rod (11) via the chain.

2. The engine hoist with center of gravity adjustment function as described in claim 1, characterized in that: The balance boom (13) has multiple hanging points, and the distance between the hanging points and the support rod (11) is different. The center of gravity position after the engine is suspended can be adjusted by hanging the chain on different hanging points.

3. An engine hoist with a center of gravity adjustment function as described in claim 1, characterized in that: The balance boom (13) is equipped with an adjustment component inside, which can adjust the length of the balance boom (13) distributed on both sides of the support rod (11); The adjustment assembly includes a sliding guide rod (31) disposed inside the balance boom (13), the support rod (11) is slidably connected to the sliding guide rod (31), and the support rod (11) can slide along the length direction of the sliding guide rod (31).

4. An engine hoist with a center of gravity adjustment function as described in claim 3, characterized in that: The top of the support rod (11) is provided with an embedding groove, and a limiting cover (17) is connected to the middle of the embedding groove. The sliding guide rod (31) is in two sets and is located on both sides of the limiting cover (17). When the support rod (11) is connected to the balance boom (13), the limiting cover (17) is located inside the balance boom (13).

5. An engine hoist with a center of gravity adjustment function as described in claim 4, characterized in that: The end of the sliding guide rod (31) is connected to the end cap (32), and the sliding guide rod (31) is connected to one end of the chain through the end cap (32). The end cap (32) and the limiting cover (17) are connected by a spring, and the spring is always in a stretched state. The springs on both sets of sliding guide rods (31) are connected to the same limiting cover (17) and are distributed on both sides of the limiting cover (17). Under the elastic force of the spring, the sliding guide rod (31) drives the chain to move into the interior of the balance arm (13) until the end of the sliding guide rod (31) fits into the interior of the balance arm (13). At the same time, it pushes the support rod (11) towards the center of the balance arm (13).

6. An engine hoist with a center of gravity adjustment function as described in claim 5, characterized in that: The sliding guide rod (31) is fitted with a limiting component (4) that can be adjusted along the length of the sliding guide rod (31); when the chain is pulled outward, both limiting components (4) move in the direction of the support rod (11) to limit the range of motion of the support rod (11).

7. An engine hoist with a center of gravity adjustment function as described in claim 6, characterized in that: The limiting component (4) includes a sleeve seat (41) sleeved on the sliding guide rod (31), and a movable snap-fit ​​plate (43) is inserted into the center of the sleeve seat (41), which can snap with the teeth (34) on the inner wall of the sliding guide rod (31). When the snap-fit ​​plate (43) is housed in the sleeve seat (41), the sleeve seat (41) can slide along the sliding guide rod (31); conversely, when the snap-fit ​​plate (43) is inserted into the gap between two adjacent teeth (34), the sleeve seat (41) cannot slide along the sliding guide rod (31).

8. An engine hoist with a center of gravity adjustment function as described in any one of claims 1-7, characterized in that: At the bottom and near both ends of the balance boom (13), an outward tube (21) is hinged, and the outward tube (21) is connected to the balance boom (13) by a torsion spring (23). The end of the outward tube (21) extends outward under the action of the torsion spring (23). The balance boom (13) is provided with a connecting groove (26) at the position corresponding to the outward tube (21). The chain enters the outward tube (21) along the connecting groove (26) and extends out from the other end of the outward tube (21).

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